if_spppsubr.c revision 1.255
1 /* $NetBSD: if_spppsubr.c,v 1.255 2021/06/01 05:11:22 yamaguchi Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions are met: 18 * 1. Redistributions of source code must retain the above copyright notice, 19 * this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright notice, 21 * this list of conditions and the following disclaimer in the documentation 22 * and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 * 36 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 37 * 38 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 39 * 40 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.255 2021/06/01 05:11:22 yamaguchi Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_modular.h" 49 #include "opt_compat_netbsd.h" 50 #include "opt_net_mpsafe.h" 51 #include "opt_sppp.h" 52 #endif 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 #include <sys/module.h> 69 #include <sys/workqueue.h> 70 #include <sys/atomic.h> 71 #include <sys/compat_stub.h> 72 #include <sys/cpu.h> 73 74 #include <net/if.h> 75 #include <net/netisr.h> 76 #include <net/if_types.h> 77 #include <net/route.h> 78 #include <net/ppp_defs.h> 79 80 #include <netinet/in.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/in_var.h> 83 #ifdef INET 84 #include <netinet/ip.h> 85 #include <netinet/tcp.h> 86 #endif 87 #include <net/ethertypes.h> 88 89 #ifdef INET6 90 #include <netinet6/scope6_var.h> 91 #endif 92 93 #include <net/if_sppp.h> 94 #include <net/if_spppvar.h> 95 96 #ifdef NET_MPSAFE 97 #define SPPPSUBR_MPSAFE 1 98 #endif 99 100 #define DEFAULT_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 101 #define DEFAULT_ALIVE_INTERVAL 1 /* count of sppp_keepalive */ 102 #define LOOPALIVECNT 3 /* loopback detection tries */ 103 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 104 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 105 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 106 107 #ifndef SPPP_KEEPALIVE_INTERVAL 108 #define SPPP_KEEPALIVE_INTERVAL DEFAULT_KEEPALIVE_INTERVAL 109 #endif 110 111 #ifndef SPPP_NORECV_TIME 112 #define SPPP_NORECV_TIME DEFAULT_NORECV_TIME 113 #endif 114 115 #ifndef SPPP_ALIVE_INTERVAL 116 #define SPPP_ALIVE_INTERVAL DEFAULT_ALIVE_INTERVAL 117 #endif 118 119 #define SPPP_CPTYPE_NAMELEN 5 /* buf size of cp type name */ 120 #define SPPP_AUTHTYPE_NAMELEN 32 /* buf size of auth type name */ 121 #define SPPP_LCPOPT_NAMELEN 5 /* buf size of lcp option name */ 122 #define SPPP_IPCPOPT_NAMELEN 5 /* buf size of ipcp option name */ 123 #define SPPP_IPV6CPOPT_NAMELEN 5 /* buf size of ipv6cp option name */ 124 #define SPPP_PROTO_NAMELEN 7 /* buf size of protocol name */ 125 #define SPPP_DOTQUAD_BUFLEN 16 /* length of "aa.bb.cc.dd" */ 126 127 /* 128 * Interface flags that can be set in an ifconfig command. 129 * 130 * Setting link0 will make the link passive, i.e. it will be marked 131 * as being administrative openable, but won't be opened to begin 132 * with. Incoming calls will be answered, or subsequent calls with 133 * -link1 will cause the administrative open of the LCP layer. 134 * 135 * Setting link1 will cause the link to auto-dial only as packets 136 * arrive to be sent. 137 * 138 * Setting IFF_DEBUG will syslog the option negotiation and state 139 * transitions at level kern.debug. Note: all logs consistently look 140 * like 141 * 142 * <if-name><unit>: <proto-name> <additional info...> 143 * 144 * with <if-name><unit> being something like "bppp0", and <proto-name> 145 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 146 */ 147 148 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 149 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 150 151 #define CONF_REQ 1 /* PPP configure request */ 152 #define CONF_ACK 2 /* PPP configure acknowledge */ 153 #define CONF_NAK 3 /* PPP configure negative ack */ 154 #define CONF_REJ 4 /* PPP configure reject */ 155 #define TERM_REQ 5 /* PPP terminate request */ 156 #define TERM_ACK 6 /* PPP terminate acknowledge */ 157 #define CODE_REJ 7 /* PPP code reject */ 158 #define PROTO_REJ 8 /* PPP protocol reject */ 159 #define ECHO_REQ 9 /* PPP echo request */ 160 #define ECHO_REPLY 10 /* PPP echo reply */ 161 #define DISC_REQ 11 /* PPP discard request */ 162 163 #define LCP_OPT_MRU 1 /* maximum receive unit */ 164 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 165 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 166 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 167 #define LCP_OPT_MAGIC 5 /* magic number */ 168 #define LCP_OPT_RESERVED 6 /* reserved */ 169 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 170 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 171 #define LCP_OPT_FCS_ALTS 9 /* FCS alternatives */ 172 #define LCP_OPT_SELF_DESC_PAD 10 /* self-describing padding */ 173 #define LCP_OPT_CALL_BACK 13 /* callback */ 174 #define LCP_OPT_COMPOUND_FRMS 15 /* compound frames */ 175 #define LCP_OPT_MP_MRRU 17 /* multilink MRRU */ 176 #define LCP_OPT_MP_SSNHF 18 /* multilink short seq. numbers */ 177 #define LCP_OPT_MP_EID 19 /* multilink endpoint discriminator */ 178 179 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 180 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 181 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 182 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 183 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 184 185 #define IPCP_UPDATE_LIMIT 8 /* limit of pending IP updating job */ 186 #define IPCP_SET_ADDRS 1 /* marker for IP address setting job */ 187 #define IPCP_CLEAR_ADDRS 2 /* marker for IP address clearing job */ 188 189 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 190 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 191 192 #define PAP_REQ 1 /* PAP name/password request */ 193 #define PAP_ACK 2 /* PAP acknowledge */ 194 #define PAP_NAK 3 /* PAP fail */ 195 196 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 197 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 198 #define CHAP_SUCCESS 3 /* CHAP response ok */ 199 #define CHAP_FAILURE 4 /* CHAP response failed */ 200 201 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 202 203 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 204 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 205 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 206 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 207 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 208 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 209 210 #define PPP_NOPROTO 0 /* no authentication protocol */ 211 212 enum { 213 STATE_INITIAL = SPPP_STATE_INITIAL, 214 STATE_STARTING = SPPP_STATE_STARTING, 215 STATE_CLOSED = SPPP_STATE_CLOSED, 216 STATE_STOPPED = SPPP_STATE_STOPPED, 217 STATE_CLOSING = SPPP_STATE_CLOSING, 218 STATE_STOPPING = SPPP_STATE_STOPPING, 219 STATE_REQ_SENT = SPPP_STATE_REQ_SENT, 220 STATE_ACK_RCVD = SPPP_STATE_ACK_RCVD, 221 STATE_ACK_SENT = SPPP_STATE_ACK_SENT, 222 STATE_OPENED = SPPP_STATE_OPENED, 223 }; 224 225 enum cp_rcr_type { 226 CP_RCR_NONE = 0, /* initial value */ 227 CP_RCR_ACK, /* RCR+ */ 228 CP_RCR_NAK, /* RCR- */ 229 CP_RCR_REJ, /* RCR- */ 230 CP_RCR_DROP, /* DROP message */ 231 CP_RCR_ERR, /* internal error */ 232 }; 233 234 struct ppp_header { 235 uint8_t address; 236 uint8_t control; 237 uint16_t protocol; 238 } __packed; 239 #define PPP_HEADER_LEN sizeof (struct ppp_header) 240 241 struct lcp_header { 242 uint8_t type; 243 uint8_t ident; 244 uint16_t len; 245 } __packed; 246 #define LCP_HEADER_LEN sizeof (struct lcp_header) 247 248 struct cisco_packet { 249 uint32_t type; 250 uint32_t par1; 251 uint32_t par2; 252 uint16_t rel; 253 uint16_t time0; 254 uint16_t time1; 255 } __packed; 256 #define CISCO_PACKET_LEN 18 257 258 /* 259 * We follow the spelling and capitalization of RFC 1661 here, to make 260 * it easier comparing with the standard. Please refer to this RFC in 261 * case you can't make sense out of these abbreviation; it will also 262 * explain the semantics related to the various events and actions. 263 */ 264 struct cp { 265 u_short proto; /* PPP control protocol number */ 266 u_char protoidx; /* index into state table in struct sppp */ 267 u_char flags; 268 #define CP_LCP 0x01 /* this is the LCP */ 269 #define CP_AUTH 0x02 /* this is an authentication protocol */ 270 #define CP_NCP 0x04 /* this is a NCP */ 271 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 272 const char *name; /* name of this control protocol */ 273 /* event handlers */ 274 void (*Up)(struct sppp *, void *); 275 void (*Down)(struct sppp *, void *); 276 void (*Open)(struct sppp *, void *); 277 void (*Close)(struct sppp *, void *); 278 void (*TO)(struct sppp *, void *); 279 /* actions */ 280 void (*tlu)(struct sppp *); 281 void (*tld)(struct sppp *); 282 void (*tls)(const struct cp *, struct sppp *); 283 void (*tlf)(const struct cp *, struct sppp *); 284 void (*scr)(struct sppp *); 285 void (*screply)(const struct cp *, struct sppp *, u_char, 286 uint8_t, size_t, void *); 287 288 /* message parser */ 289 enum cp_rcr_type 290 (*parse_confreq)(struct sppp *, struct lcp_header *, int, 291 uint8_t **, size_t *, size_t *); 292 void (*parse_confrej)(struct sppp *, struct lcp_header *, int); 293 void (*parse_confnak)(struct sppp *, struct lcp_header *, int); 294 }; 295 296 enum auth_role { 297 SPPP_AUTH_NOROLE = 0, 298 SPPP_AUTH_SERV = __BIT(0), 299 SPPP_AUTH_PEER = __BIT(1), 300 }; 301 302 static struct sppp *spppq; 303 static kmutex_t *spppq_lock = NULL; 304 static callout_t keepalive_ch; 305 static unsigned int sppp_keepalive_cnt = 0; 306 307 #define SPPPQ_LOCK() if (spppq_lock) \ 308 mutex_enter(spppq_lock); 309 #define SPPPQ_UNLOCK() if (spppq_lock) \ 310 mutex_exit(spppq_lock); 311 312 #define SPPP_LOCK(_sp, _op) rw_enter(&(_sp)->pp_lock, (_op)) 313 #define SPPP_UNLOCK(_sp) rw_exit(&(_sp)->pp_lock) 314 #define SPPP_WLOCKED(_sp) rw_write_held(&(_sp)->pp_lock) 315 #define SPPP_UPGRADE(_sp) do{ \ 316 SPPP_UNLOCK(_sp); \ 317 SPPP_LOCK(_sp, RW_WRITER); \ 318 }while (0) 319 #define SPPP_DOWNGRADE(_sp) rw_downgrade(&(_sp)->pp_lock) 320 #define SPPP_WQ_SET(_wk, _func, _arg) \ 321 sppp_wq_set((_wk), (_func), __UNCONST((_arg))) 322 #define SPPP_LOG(_sp, _lvl, _fmt, _args...) do { \ 323 if (__predict_true((_sp) != NULL)) { \ 324 log((_lvl), "%s: ", (_sp)->pp_if.if_xname); \ 325 } \ 326 addlog((_fmt), ##_args); \ 327 } while (0) 328 #define SPPP_DLOG(_sp, _fmt, _args...) do { \ 329 if (!sppp_debug_enabled(_sp)) \ 330 break; \ 331 SPPP_LOG(_sp, LOG_DEBUG, _fmt, ##_args); \ 332 } while (0) 333 334 #ifdef INET 335 #ifndef SPPPSUBR_MPSAFE 336 /* 337 * The following disgusting hack gets around the problem that IP TOS 338 * can't be set yet. We want to put "interactive" traffic on a high 339 * priority queue. To decide if traffic is interactive, we check that 340 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 341 * 342 * XXX is this really still necessary? - joerg - 343 */ 344 static u_short interactive_ports[8] = { 345 0, 513, 0, 0, 346 0, 21, 0, 23, 347 }; 348 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 349 #endif /* SPPPSUBR_MPSAFE */ 350 #endif 351 352 /* almost every function needs these */ 353 354 static bool sppp_debug_enabled(struct sppp *sp); 355 static int sppp_output(struct ifnet *, struct mbuf *, 356 const struct sockaddr *, const struct rtentry *); 357 358 static void sppp_cp_init(const struct cp *, struct sppp *); 359 static void sppp_cp_fini(const struct cp *, struct sppp *); 360 static void sppp_cp_input(const struct cp *, struct sppp *, 361 struct mbuf *); 362 static void sppp_cp_input(const struct cp *, struct sppp *, 363 struct mbuf *); 364 static void sppp_cp_send(struct sppp *, u_short, u_char, 365 u_char, u_short, void *); 366 /* static void sppp_cp_timeout(void *arg); */ 367 static void sppp_cp_change_state(const struct cp *, struct sppp *, int); 368 static struct workqueue * 369 sppp_wq_create(struct sppp *, const char *, pri_t, int, int); 370 static void sppp_wq_destroy(struct sppp *, struct workqueue *); 371 static void sppp_wq_set(struct sppp_work *, 372 void (*)(struct sppp *, void *), void *); 373 static void sppp_wq_add(struct workqueue *, struct sppp_work *); 374 static void sppp_wq_wait(struct workqueue *, struct sppp_work *); 375 static void sppp_cp_to_lcp(void *); 376 static void sppp_cp_to_ipcp(void *); 377 static void sppp_cp_to_ipv6cp(void *); 378 static void sppp_auth_send(const struct cp *, struct sppp *, 379 unsigned int, unsigned int, ...); 380 static int sppp_auth_role(const struct cp *, struct sppp *); 381 static void sppp_auth_to_event(struct sppp *, void *); 382 static void sppp_auth_screply(const struct cp *, struct sppp *, 383 u_char, uint8_t, size_t, void *); 384 static void sppp_up_event(struct sppp *, void *); 385 static void sppp_down_event(struct sppp *, void *); 386 static void sppp_open_event(struct sppp *, void *); 387 static void sppp_close_event(struct sppp *, void *); 388 static void sppp_to_event(struct sppp *, void *); 389 static void sppp_rcr_event(struct sppp *, void *); 390 static void sppp_rca_event(struct sppp *, void *); 391 static void sppp_rcn_event(struct sppp *, void *); 392 static void sppp_rtr_event(struct sppp *, void *); 393 static void sppp_rta_event(struct sppp *, void *); 394 static void sppp_rxj_event(struct sppp *, void *); 395 396 static void sppp_null(struct sppp *); 397 static void sppp_tls(const struct cp *, struct sppp *); 398 static void sppp_tlf(const struct cp *, struct sppp *); 399 static void sppp_screply(const struct cp *, struct sppp *, 400 u_char, uint8_t, size_t, void *); 401 static void sppp_ifdown(struct sppp *, void *); 402 403 static void sppp_lcp_init(struct sppp *); 404 static void sppp_lcp_up(struct sppp *, void *); 405 static void sppp_lcp_down(struct sppp *, void *); 406 static void sppp_lcp_open(struct sppp *, void *); 407 static enum cp_rcr_type 408 sppp_lcp_confreq(struct sppp *, struct lcp_header *, int, 409 uint8_t **, size_t *, size_t *); 410 static void sppp_lcp_confrej(struct sppp *, struct lcp_header *, int); 411 static void sppp_lcp_confnak(struct sppp *, struct lcp_header *, int); 412 static void sppp_lcp_tlu(struct sppp *); 413 static void sppp_lcp_tld(struct sppp *); 414 static void sppp_lcp_tls(const struct cp *, struct sppp *); 415 static void sppp_lcp_tlf(const struct cp *, struct sppp *); 416 static void sppp_lcp_scr(struct sppp *); 417 static void sppp_lcp_check_and_close(struct sppp *); 418 static int sppp_cp_check(struct sppp *, u_char); 419 420 static void sppp_ipcp_init(struct sppp *); 421 static void sppp_ipcp_open(struct sppp *, void *); 422 static void sppp_ipcp_close(struct sppp *, void *); 423 static enum cp_rcr_type 424 sppp_ipcp_confreq(struct sppp *, struct lcp_header *, int, 425 uint8_t **, size_t *, size_t *); 426 static void sppp_ipcp_confrej(struct sppp *, struct lcp_header *, int); 427 static void sppp_ipcp_confnak(struct sppp *, struct lcp_header *, int); 428 static void sppp_ipcp_tlu(struct sppp *); 429 static void sppp_ipcp_tld(struct sppp *); 430 static void sppp_ipcp_scr(struct sppp *); 431 432 static void sppp_ipv6cp_init(struct sppp *); 433 static void sppp_ipv6cp_open(struct sppp *, void *); 434 static enum cp_rcr_type 435 sppp_ipv6cp_confreq(struct sppp *, struct lcp_header *, int, 436 uint8_t **, size_t *, size_t *); 437 static void sppp_ipv6cp_confrej(struct sppp *, struct lcp_header *, int); 438 static void sppp_ipv6cp_confnak(struct sppp *, struct lcp_header *, int); 439 static void sppp_ipv6cp_tlu(struct sppp *); 440 static void sppp_ipv6cp_tld(struct sppp *); 441 static void sppp_ipv6cp_scr(struct sppp *); 442 443 static void sppp_pap_input(struct sppp *, struct mbuf *); 444 static void sppp_pap_init(struct sppp *); 445 static void sppp_pap_tlu(struct sppp *); 446 static void sppp_pap_scr(struct sppp *); 447 static void sppp_pap_scr(struct sppp *); 448 449 static void sppp_chap_input(struct sppp *, struct mbuf *); 450 static void sppp_chap_init(struct sppp *); 451 static void sppp_chap_open(struct sppp *, void *); 452 static void sppp_chap_tlu(struct sppp *); 453 static void sppp_chap_scr(struct sppp *); 454 static void sppp_chap_rcv_challenge_event(struct sppp *, void *); 455 456 static const char *sppp_auth_type_name(char *, size_t, u_short, u_char); 457 static const char *sppp_cp_type_name(char *, size_t, u_char); 458 static const char *sppp_dotted_quad(char *, size_t, uint32_t); 459 static const char *sppp_ipcp_opt_name(char *, size_t, u_char); 460 #ifdef INET6 461 static const char *sppp_ipv6cp_opt_name(char *, size_t, u_char); 462 #endif 463 static const char *sppp_lcp_opt_name(char *, size_t, u_char); 464 static const char *sppp_phase_name(int); 465 static const char *sppp_proto_name(char *, size_t, u_short); 466 static const char *sppp_state_name(int); 467 static int sppp_params(struct sppp *, u_long, void *); 468 #ifdef INET 469 static void sppp_get_ip_addrs(struct sppp *, uint32_t *, uint32_t *, uint32_t *); 470 static void sppp_set_ip_addrs(struct sppp *); 471 static void sppp_clear_ip_addrs(struct sppp *); 472 #endif 473 static void sppp_keepalive(void *); 474 static void sppp_phase_network(struct sppp *); 475 static void sppp_print_bytes(const u_char *, u_short); 476 static void sppp_print_string(const char *, u_short); 477 #ifdef INET6 478 static void sppp_get_ip6_addrs(struct sppp *, struct in6_addr *, 479 struct in6_addr *, struct in6_addr *); 480 #ifdef IPV6CP_MYIFID_DYN 481 static void sppp_set_ip6_addr(struct sppp *, const struct in6_addr *); 482 static void sppp_gen_ip6_addr(struct sppp *, const struct in6_addr *); 483 #endif 484 static void sppp_suggest_ip6_addr(struct sppp *, struct in6_addr *); 485 #endif 486 487 static void sppp_notify_up(struct sppp *); 488 static void sppp_notify_down(struct sppp *); 489 static void sppp_notify_tls_wlocked(struct sppp *); 490 static void sppp_notify_tlf_wlocked(struct sppp *); 491 #ifdef INET6 492 static void sppp_notify_con_wlocked(struct sppp *); 493 #endif 494 static void sppp_notify_con(struct sppp *); 495 496 static void sppp_notify_chg_wlocked(struct sppp *); 497 498 /* our control protocol descriptors */ 499 static const struct cp lcp = { 500 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 501 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, 502 sppp_close_event, sppp_to_event, 503 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, 504 sppp_lcp_tlf, sppp_lcp_scr, sppp_screply, 505 sppp_lcp_confreq, sppp_lcp_confrej, sppp_lcp_confnak 506 }; 507 508 static const struct cp ipcp = { 509 PPP_IPCP, IDX_IPCP, 510 #ifdef INET 511 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 512 #else 513 0, 514 #endif 515 "ipcp", 516 sppp_up_event, sppp_down_event, sppp_ipcp_open, 517 sppp_ipcp_close, sppp_to_event, 518 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_tls, 519 sppp_tlf, sppp_ipcp_scr, sppp_screply, 520 sppp_ipcp_confreq, sppp_ipcp_confrej, sppp_ipcp_confnak, 521 }; 522 523 static const struct cp ipv6cp = { 524 PPP_IPV6CP, IDX_IPV6CP, 525 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 526 CP_NCP, 527 #else 528 0, 529 #endif 530 "ipv6cp", 531 sppp_up_event, sppp_down_event, sppp_ipv6cp_open, 532 sppp_close_event, sppp_to_event, 533 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_tls, 534 sppp_tlf, sppp_ipv6cp_scr, sppp_screply, 535 sppp_ipv6cp_confreq, sppp_ipv6cp_confrej, sppp_ipv6cp_confnak, 536 }; 537 538 static const struct cp pap = { 539 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 540 sppp_up_event, sppp_down_event, sppp_open_event, 541 sppp_close_event, sppp_to_event, 542 sppp_pap_tlu, sppp_null, sppp_tls, sppp_tlf, 543 sppp_pap_scr, sppp_auth_screply, 544 NULL, NULL, NULL 545 }; 546 547 static const struct cp chap = { 548 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 549 sppp_up_event, sppp_down_event, sppp_chap_open, 550 sppp_close_event, sppp_auth_to_event, 551 sppp_chap_tlu, sppp_null, sppp_tls, sppp_tlf, 552 sppp_chap_scr, sppp_auth_screply, 553 NULL, NULL, NULL 554 }; 555 556 static const struct cp *cps[IDX_COUNT] = { 557 &lcp, /* IDX_LCP */ 558 &ipcp, /* IDX_IPCP */ 559 &ipv6cp, /* IDX_IPV6CP */ 560 &pap, /* IDX_PAP */ 561 &chap, /* IDX_CHAP */ 562 }; 563 564 static inline u_int 565 sppp_proto2authproto(u_short proto) 566 { 567 568 switch (proto) { 569 case PPP_PAP: 570 return SPPP_AUTHPROTO_PAP; 571 case PPP_CHAP: 572 return SPPP_AUTHPROTO_CHAP; 573 } 574 575 return SPPP_AUTHPROTO_NONE; 576 } 577 578 static inline u_short 579 sppp_authproto2proto(u_int authproto) 580 { 581 582 switch (authproto) { 583 case SPPP_AUTHPROTO_PAP: 584 return PPP_PAP; 585 case SPPP_AUTHPROTO_CHAP: 586 return PPP_CHAP; 587 } 588 589 return PPP_NOPROTO; 590 } 591 592 static inline bool 593 sppp_debug_enabled(struct sppp *sp) 594 { 595 596 if (__predict_false(sp == NULL)) 597 return false; 598 599 if ((sp->pp_if.if_flags & IFF_DEBUG) == 0) 600 return false; 601 602 return true; 603 } 604 605 static void 606 sppp_change_phase(struct sppp *sp, int phase) 607 { 608 struct ifnet *ifp; 609 610 KASSERT(SPPP_WLOCKED(sp)); 611 612 ifp = &sp->pp_if; 613 614 if (sp->pp_phase == phase) 615 return; 616 617 sp->pp_phase = phase; 618 619 if (phase == SPPP_PHASE_NETWORK) 620 if_link_state_change(ifp, LINK_STATE_UP); 621 else 622 if_link_state_change(ifp, LINK_STATE_DOWN); 623 624 SPPP_DLOG(sp, "phase %s\n", 625 sppp_phase_name(sp->pp_phase)); 626 } 627 628 /* 629 * Exported functions, comprising our interface to the lower layer. 630 */ 631 632 /* 633 * Process the received packet. 634 */ 635 void 636 sppp_input(struct ifnet *ifp, struct mbuf *m) 637 { 638 struct ppp_header *h = NULL; 639 pktqueue_t *pktq = NULL; 640 struct ifqueue *inq = NULL; 641 uint16_t protocol; 642 struct sppp *sp = (struct sppp *)ifp; 643 int isr = 0; 644 645 SPPP_LOCK(sp, RW_READER); 646 647 if (ifp->if_flags & IFF_UP) { 648 /* Count received bytes, add hardware framing */ 649 if_statadd(ifp, if_ibytes, m->m_pkthdr.len + sp->pp_framebytes); 650 /* Note time of last receive */ 651 sp->pp_last_receive = time_uptime; 652 } 653 654 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 655 /* Too small packet, drop it. */ 656 SPPP_DLOG(sp, "input packet is too small, " 657 "%d bytes\n", m->m_pkthdr.len); 658 goto drop; 659 } 660 661 if (sp->pp_flags & PP_NOFRAMING) { 662 memcpy(&protocol, mtod(m, void *), 2); 663 protocol = ntohs(protocol); 664 m_adj(m, 2); 665 } else { 666 667 /* Get PPP header. */ 668 h = mtod(m, struct ppp_header *); 669 m_adj(m, PPP_HEADER_LEN); 670 671 switch (h->address) { 672 case PPP_ALLSTATIONS: 673 if (h->control != PPP_UI) 674 goto invalid; 675 break; 676 case CISCO_MULTICAST: 677 case CISCO_UNICAST: 678 /* Don't check the control field here (RFC 1547). */ 679 SPPP_DLOG(sp, "Cisco packet in PPP mode " 680 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 681 h->address, h->control, ntohs(h->protocol)); 682 goto drop; 683 default: /* Invalid PPP packet. */ 684 invalid: 685 SPPP_DLOG(sp, "invalid input packet " 686 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 687 h->address, h->control, ntohs(h->protocol)); 688 goto drop; 689 } 690 protocol = ntohs(h->protocol); 691 } 692 693 switch (protocol) { 694 reject_protocol: 695 if (sp->scp[IDX_LCP].state == STATE_OPENED) { 696 uint16_t prot = htons(protocol); 697 698 SPPP_UPGRADE(sp); 699 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 700 ++sp->scp[IDX_LCP].seq, m->m_pkthdr.len + 2, 701 &prot); 702 SPPP_DOWNGRADE(sp); 703 } 704 if_statinc(ifp, if_noproto); 705 goto drop; 706 default: 707 SPPP_DLOG(sp, "invalid input protocol " 708 "<proto=0x%x>\n", protocol); 709 goto reject_protocol; 710 case PPP_LCP: 711 SPPP_UNLOCK(sp); 712 sppp_cp_input(&lcp, sp, m); 713 /* already m_freem(m) */ 714 return; 715 case PPP_PAP: 716 SPPP_UNLOCK(sp); 717 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 718 sppp_pap_input(sp, m); 719 } 720 m_freem(m); 721 return; 722 case PPP_CHAP: 723 SPPP_UNLOCK(sp); 724 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 725 sppp_chap_input(sp, m); 726 } 727 m_freem(m); 728 return; 729 #ifdef INET 730 case PPP_IPCP: 731 if (!ISSET(sp->pp_ncpflags, SPPP_NCP_IPCP)) { 732 SPPP_LOG(sp, LOG_INFO, "reject IPCP packet " 733 "because IPCP is disabled\n"); 734 goto reject_protocol; 735 } 736 SPPP_UNLOCK(sp); 737 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 738 sppp_cp_input(&ipcp, sp, m); 739 /* already m_freem(m) */ 740 } else { 741 m_freem(m); 742 } 743 return; 744 case PPP_IP: 745 if (sp->scp[IDX_IPCP].state == STATE_OPENED) { 746 sp->pp_last_activity = time_uptime; 747 pktq = ip_pktq; 748 } 749 break; 750 #endif 751 #ifdef INET6 752 case PPP_IPV6CP: 753 if (!ISSET(sp->pp_ncpflags, SPPP_NCP_IPV6CP)) { 754 SPPP_LOG(sp, LOG_INFO, "reject IPv6CP packet " 755 "because IPv6CP is disabled\n"); 756 goto reject_protocol; 757 } 758 SPPP_UNLOCK(sp); 759 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 760 sppp_cp_input(&ipv6cp, sp, m); 761 /* already m_freem(m) */ 762 } else { 763 m_freem(m); 764 } 765 return; 766 767 case PPP_IPV6: 768 if (sp->scp[IDX_IPV6CP].state == STATE_OPENED) { 769 sp->pp_last_activity = time_uptime; 770 pktq = ip6_pktq; 771 } 772 break; 773 #endif 774 } 775 776 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 777 goto drop; 778 } 779 780 /* Check queue. */ 781 if (__predict_true(pktq)) { 782 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 783 goto drop; 784 } 785 SPPP_UNLOCK(sp); 786 return; 787 } 788 789 SPPP_UNLOCK(sp); 790 791 IFQ_LOCK(inq); 792 if (IF_QFULL(inq)) { 793 /* Queue overflow. */ 794 IF_DROP(inq); 795 IFQ_UNLOCK(inq); 796 SPPP_DLOG(sp,"protocol queue overflow\n"); 797 SPPP_LOCK(sp, RW_READER); 798 goto drop; 799 } 800 IF_ENQUEUE(inq, m); 801 IFQ_UNLOCK(inq); 802 schednetisr(isr); 803 return; 804 805 drop: 806 if_statadd2(ifp, if_ierrors, 1, if_iqdrops, 1); 807 m_freem(m); 808 SPPP_UNLOCK(sp); 809 return; 810 } 811 812 /* 813 * Enqueue transmit packet. 814 */ 815 static int 816 sppp_output(struct ifnet *ifp, struct mbuf *m, 817 const struct sockaddr *dst, const struct rtentry *rt) 818 { 819 struct sppp *sp = (struct sppp *) ifp; 820 struct ppp_header *h = NULL; 821 #ifndef SPPPSUBR_MPSAFE 822 struct ifqueue *ifq = NULL; /* XXX */ 823 #endif 824 int s, error = 0; 825 uint16_t protocol; 826 size_t pktlen; 827 828 s = splnet(); 829 SPPP_LOCK(sp, RW_READER); 830 831 sp->pp_last_activity = time_uptime; 832 833 if ((ifp->if_flags & IFF_UP) == 0 || 834 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 835 SPPP_UNLOCK(sp); 836 splx(s); 837 838 m_freem(m); 839 if_statinc(ifp, if_oerrors); 840 return (ENETDOWN); 841 } 842 843 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 844 /* ignore packets that have no enabled NCP */ 845 if ((dst->sa_family == AF_INET && 846 !ISSET(sp->pp_ncpflags, SPPP_NCP_IPCP)) || 847 (dst->sa_family == AF_INET6 && 848 !ISSET(sp->pp_ncpflags, SPPP_NCP_IPV6CP))) { 849 SPPP_UNLOCK(sp); 850 splx(s); 851 852 m_freem(m); 853 if_statinc(ifp, if_oerrors); 854 return (ENETDOWN); 855 } 856 /* 857 * Interface is not yet running, but auto-dial. Need 858 * to start LCP for it. 859 */ 860 ifp->if_flags |= IFF_RUNNING; 861 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_open); 862 } 863 864 /* 865 * If the queueing discipline needs packet classification, 866 * do it before prepending link headers. 867 */ 868 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 869 870 #ifdef INET 871 if (dst->sa_family == AF_INET) { 872 struct ip *ip = NULL; 873 #ifndef SPPPSUBR_MPSAFE 874 struct tcphdr *th = NULL; 875 #endif 876 877 if (m->m_len >= sizeof(struct ip)) { 878 ip = mtod(m, struct ip *); 879 #ifndef SPPPSUBR_MPSAFE 880 if (ip->ip_p == IPPROTO_TCP && 881 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 882 sizeof(struct tcphdr)) { 883 th = (struct tcphdr *) 884 ((char *)ip + (ip->ip_hl << 2)); 885 } 886 #endif 887 } else 888 ip = NULL; 889 890 /* 891 * When using dynamic local IP address assignment by using 892 * 0.0.0.0 as a local address, the first TCP session will 893 * not connect because the local TCP checksum is computed 894 * using 0.0.0.0 which will later become our real IP address 895 * so the TCP checksum computed at the remote end will 896 * become invalid. So we 897 * - don't let packets with src ip addr 0 thru 898 * - we flag TCP packets with src ip 0 as an error 899 */ 900 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 901 uint8_t proto = ip->ip_p; 902 903 SPPP_UNLOCK(sp); 904 splx(s); 905 906 m_freem(m); 907 if (proto == IPPROTO_TCP) 908 return (EADDRNOTAVAIL); 909 else 910 return (0); 911 } 912 913 #ifndef SPPPSUBR_MPSAFE 914 /* 915 * Put low delay, telnet, rlogin and ftp control packets 916 * in front of the queue. 917 */ 918 if (!IF_QFULL(&sp->pp_fastq) && 919 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 920 (th && (INTERACTIVE(ntohs(th->th_sport)) || 921 INTERACTIVE(ntohs(th->th_dport)))))) 922 ifq = &sp->pp_fastq; 923 #endif /* !SPPPSUBR_MPSAFE */ 924 } 925 #endif 926 927 #ifdef INET6 928 if (dst->sa_family == AF_INET6) { 929 /* XXX do something tricky here? */ 930 } 931 #endif 932 933 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 934 /* 935 * Prepend general data packet PPP header. For now, IP only. 936 */ 937 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 938 if (! m) { 939 SPPP_DLOG(sp, "no memory for transmit header\n"); 940 if_statinc(ifp, if_oerrors); 941 SPPP_UNLOCK(sp); 942 splx(s); 943 return (ENOBUFS); 944 } 945 /* 946 * May want to check size of packet 947 * (albeit due to the implementation it's always enough) 948 */ 949 h = mtod(m, struct ppp_header *); 950 h->address = PPP_ALLSTATIONS; /* broadcast address */ 951 h->control = PPP_UI; /* Unnumbered Info */ 952 } 953 954 switch (dst->sa_family) { 955 #ifdef INET 956 case AF_INET: /* Internet Protocol */ 957 /* 958 * Don't choke with an ENETDOWN early. It's 959 * possible that we just started dialing out, 960 * so don't drop the packet immediately. If 961 * we notice that we run out of buffer space 962 * below, we will however remember that we are 963 * not ready to carry IP packets, and return 964 * ENETDOWN, as opposed to ENOBUFS. 965 */ 966 protocol = htons(PPP_IP); 967 if (sp->scp[IDX_IPCP].state != STATE_OPENED) { 968 if (ifp->if_flags & IFF_AUTO) { 969 error = ENETDOWN; 970 } else { 971 IF_DROP(&ifp->if_snd); 972 SPPP_UNLOCK(sp); 973 splx(s); 974 975 m_freem(m); 976 if_statinc(ifp, if_oerrors); 977 return (ENETDOWN); 978 } 979 } 980 break; 981 #endif 982 #ifdef INET6 983 case AF_INET6: /* Internet Protocol version 6 */ 984 /* 985 * Don't choke with an ENETDOWN early. It's 986 * possible that we just started dialing out, 987 * so don't drop the packet immediately. If 988 * we notice that we run out of buffer space 989 * below, we will however remember that we are 990 * not ready to carry IP packets, and return 991 * ENETDOWN, as opposed to ENOBUFS. 992 */ 993 protocol = htons(PPP_IPV6); 994 if (sp->scp[IDX_IPV6CP].state != STATE_OPENED) { 995 if (ifp->if_flags & IFF_AUTO) { 996 error = ENETDOWN; 997 } else { 998 IF_DROP(&ifp->if_snd); 999 SPPP_UNLOCK(sp); 1000 splx(s); 1001 1002 m_freem(m); 1003 if_statinc(ifp, if_oerrors); 1004 return (ENETDOWN); 1005 } 1006 } 1007 break; 1008 #endif 1009 default: 1010 m_freem(m); 1011 if_statinc(ifp, if_oerrors); 1012 SPPP_UNLOCK(sp); 1013 splx(s); 1014 return (EAFNOSUPPORT); 1015 } 1016 1017 if (sp->pp_flags & PP_NOFRAMING) { 1018 M_PREPEND(m, 2, M_DONTWAIT); 1019 if (m == NULL) { 1020 SPPP_DLOG(sp, "no memory for transmit header\n"); 1021 if_statinc(ifp, if_oerrors); 1022 SPPP_UNLOCK(sp); 1023 splx(s); 1024 return (ENOBUFS); 1025 } 1026 *mtod(m, uint16_t *) = protocol; 1027 } else { 1028 h->protocol = protocol; 1029 } 1030 1031 pktlen = m->m_pkthdr.len; 1032 #ifdef SPPPSUBR_MPSAFE 1033 SPPP_UNLOCK(sp); 1034 error = if_transmit_lock(ifp, m); 1035 SPPP_LOCK(sp, RW_READER); 1036 if (error == 0) 1037 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 1038 #else /* !SPPPSUBR_MPSAFE */ 1039 error = ifq_enqueue2(ifp, ifq, m); 1040 1041 if (error == 0) { 1042 /* 1043 * Count output packets and bytes. 1044 * The packet length includes header + additional hardware 1045 * framing according to RFC 1333. 1046 */ 1047 if (!(ifp->if_flags & IFF_OACTIVE)) { 1048 SPPP_UNLOCK(sp); 1049 if_start_lock(ifp); 1050 SPPP_LOCK(sp, RW_READER); 1051 } 1052 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 1053 } 1054 #endif /* !SPPPSUBR_MPSAFE */ 1055 SPPP_UNLOCK(sp); 1056 splx(s); 1057 return error; 1058 } 1059 1060 void 1061 sppp_attach(struct ifnet *ifp) 1062 { 1063 struct sppp *sp = (struct sppp *) ifp; 1064 char xnamebuf[MAXCOMLEN]; 1065 1066 /* Initialize keepalive handler. */ 1067 if (! spppq) { 1068 callout_init(&keepalive_ch, CALLOUT_MPSAFE); 1069 callout_reset(&keepalive_ch, hz * SPPP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 1070 } 1071 1072 if (! spppq_lock) 1073 spppq_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 1074 1075 sp->pp_if.if_type = IFT_PPP; 1076 sp->pp_if.if_output = sppp_output; 1077 sp->pp_fastq.ifq_maxlen = 32; 1078 sp->pp_cpq.ifq_maxlen = 20; 1079 sp->pp_loopcnt = 0; 1080 sp->pp_alivecnt = 0; 1081 sp->pp_alive_interval = SPPP_ALIVE_INTERVAL; 1082 sp->pp_last_activity = 0; 1083 sp->pp_last_receive = 0; 1084 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 1085 sp->pp_max_noreceive = SPPP_NORECV_TIME; 1086 sp->pp_idle_timeout = 0; 1087 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 1088 sp->pp_phase = SPPP_PHASE_DEAD; 1089 sp->pp_up = sppp_notify_up; 1090 sp->pp_down = sppp_notify_down; 1091 sp->pp_ncpflags = SPPP_NCP_IPCP | SPPP_NCP_IPV6CP; 1092 #ifdef SPPP_IFDOWN_RECONNECT 1093 sp->pp_flags |= PP_LOOPBACK_IFDOWN | PP_KEEPALIVE_IFDOWN; 1094 #endif 1095 sppp_wq_set(&sp->work_ifdown, sppp_ifdown, NULL); 1096 memset(sp->scp, 0, sizeof(sp->scp)); 1097 rw_init(&sp->pp_lock); 1098 1099 if_alloc_sadl(ifp); 1100 1101 /* Lets not beat about the bush, we know we're down. */ 1102 ifp->if_link_state = LINK_STATE_DOWN; 1103 1104 snprintf(xnamebuf, sizeof(xnamebuf), "%s.wq_cp", ifp->if_xname); 1105 sp->wq_cp = sppp_wq_create(sp, xnamebuf, 1106 PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 1107 1108 memset(&sp->myauth, 0, sizeof sp->myauth); 1109 memset(&sp->hisauth, 0, sizeof sp->hisauth); 1110 SPPP_LOCK(sp, RW_WRITER); 1111 sppp_lcp_init(sp); 1112 sppp_ipcp_init(sp); 1113 sppp_ipv6cp_init(sp); 1114 sppp_pap_init(sp); 1115 sppp_chap_init(sp); 1116 SPPP_UNLOCK(sp); 1117 1118 SPPPQ_LOCK(); 1119 /* Insert new entry into the keepalive list. */ 1120 sp->pp_next = spppq; 1121 spppq = sp; 1122 SPPPQ_UNLOCK(); 1123 } 1124 1125 void 1126 sppp_detach(struct ifnet *ifp) 1127 { 1128 struct sppp **q, *p, *sp = (struct sppp *) ifp; 1129 1130 /* Remove the entry from the keepalive list. */ 1131 SPPPQ_LOCK(); 1132 for (q = &spppq; (p = *q); q = &p->pp_next) 1133 if (p == sp) { 1134 *q = p->pp_next; 1135 break; 1136 } 1137 SPPPQ_UNLOCK(); 1138 1139 if (! spppq) { 1140 /* Stop keepalive handler. */ 1141 callout_stop(&keepalive_ch); 1142 mutex_obj_free(spppq_lock); 1143 spppq_lock = NULL; 1144 } 1145 1146 sppp_cp_fini(&lcp, sp); 1147 sppp_cp_fini(&ipcp, sp); 1148 sppp_cp_fini(&pap, sp); 1149 sppp_cp_fini(&chap, sp); 1150 #ifdef INET6 1151 sppp_cp_fini(&ipv6cp, sp); 1152 #endif 1153 sppp_wq_destroy(sp, sp->wq_cp); 1154 1155 /* free authentication info */ 1156 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 1157 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 1158 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 1159 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 1160 rw_destroy(&sp->pp_lock); 1161 } 1162 1163 /* 1164 * Flush the interface output queue. 1165 */ 1166 void 1167 sppp_flush(struct ifnet *ifp) 1168 { 1169 struct sppp *sp = (struct sppp *) ifp; 1170 1171 SPPP_LOCK(sp, RW_WRITER); 1172 IFQ_PURGE(&sp->pp_if.if_snd); 1173 IF_PURGE(&sp->pp_fastq); 1174 IF_PURGE(&sp->pp_cpq); 1175 SPPP_UNLOCK(sp); 1176 } 1177 1178 /* 1179 * Check if the output queue is empty. 1180 */ 1181 int 1182 sppp_isempty(struct ifnet *ifp) 1183 { 1184 struct sppp *sp = (struct sppp *) ifp; 1185 int empty, s; 1186 1187 s = splnet(); 1188 SPPP_LOCK(sp, RW_READER); 1189 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1190 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1191 SPPP_UNLOCK(sp); 1192 splx(s); 1193 return (empty); 1194 } 1195 1196 /* 1197 * Get next packet to send. 1198 */ 1199 struct mbuf * 1200 sppp_dequeue(struct ifnet *ifp) 1201 { 1202 struct sppp *sp = (struct sppp *) ifp; 1203 struct mbuf *m; 1204 int s; 1205 1206 s = splnet(); 1207 SPPP_LOCK(sp, RW_WRITER); 1208 /* 1209 * Process only the control protocol queue until we have at 1210 * least one NCP open. 1211 * 1212 * Do always serve all three queues in Cisco mode. 1213 */ 1214 IF_DEQUEUE(&sp->pp_cpq, m); 1215 if (m == NULL && sppp_cp_check(sp, CP_NCP)) { 1216 IF_DEQUEUE(&sp->pp_fastq, m); 1217 if (m == NULL) 1218 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1219 } 1220 SPPP_UNLOCK(sp); 1221 splx(s); 1222 return m; 1223 } 1224 1225 /* 1226 * Process an ioctl request. Called on low priority level. 1227 */ 1228 int 1229 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1230 { 1231 struct lwp *l = curlwp; /* XXX */ 1232 struct ifreq *ifr = (struct ifreq *) data; 1233 struct ifaddr *ifa = (struct ifaddr *) data; 1234 struct sppp *sp = (struct sppp *) ifp; 1235 int s, error=0, going_up, going_down; 1236 u_short newmode; 1237 u_long lcp_mru; 1238 1239 s = splnet(); 1240 switch (cmd) { 1241 case SIOCINITIFADDR: 1242 ifa->ifa_rtrequest = p2p_rtrequest; 1243 break; 1244 1245 case SIOCSIFFLAGS: 1246 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1247 break; 1248 1249 SPPP_LOCK(sp, RW_WRITER); 1250 going_up = ifp->if_flags & IFF_UP && 1251 (ifp->if_flags & IFF_RUNNING) == 0; 1252 going_down = (ifp->if_flags & IFF_UP) == 0 && 1253 ifp->if_flags & IFF_RUNNING; 1254 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1255 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1256 /* sanity */ 1257 newmode = IFF_PASSIVE; 1258 ifp->if_flags &= ~IFF_AUTO; 1259 } 1260 1261 if (ifp->if_flags & IFF_UP) { 1262 sp->pp_flags |= PP_ADMIN_UP; 1263 } else { 1264 sp->pp_flags &= ~PP_ADMIN_UP; 1265 } 1266 1267 if (going_up || going_down) { 1268 sp->lcp.reestablish = false; 1269 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 1270 } 1271 if (going_up && newmode == 0) { 1272 /* neither auto-dial nor passive */ 1273 ifp->if_flags |= IFF_RUNNING; 1274 sppp_wq_add(sp->wq_cp, 1275 &sp->scp[IDX_LCP].work_open); 1276 } else if (going_down) { 1277 SPPP_UNLOCK(sp); 1278 sppp_flush(ifp); 1279 SPPP_LOCK(sp, RW_WRITER); 1280 1281 ifp->if_flags &= ~IFF_RUNNING; 1282 } 1283 SPPP_UNLOCK(sp); 1284 break; 1285 1286 case SIOCSIFMTU: 1287 if (ifr->ifr_mtu < PPP_MINMRU || 1288 ifr->ifr_mtu > PP_MTU) { 1289 error = EINVAL; 1290 break; 1291 } 1292 1293 error = ifioctl_common(ifp, cmd, data); 1294 if (error == ENETRESET) 1295 error = 0; 1296 1297 SPPP_LOCK(sp, RW_WRITER); 1298 lcp_mru = sp->lcp.mru; 1299 if (ifp->if_mtu < PP_MTU) { 1300 sp->lcp.mru = ifp->if_mtu; 1301 } else { 1302 sp->lcp.mru = PP_MTU; 1303 } 1304 if (lcp_mru != sp->lcp.mru) 1305 SET(sp->lcp.opts, SPPP_LCP_OPT_MRU); 1306 1307 if (sp->scp[IDX_LCP].state == STATE_OPENED && 1308 ifp->if_mtu > sp->lcp.their_mru) { 1309 sp->pp_saved_mtu = ifp->if_mtu; 1310 ifp->if_mtu = sp->lcp.their_mru; 1311 1312 SPPP_DLOG(sp, "setting MTU " 1313 "from %"PRIu64" bytes to %"PRIu64" bytes\n", 1314 sp->pp_saved_mtu, ifp->if_mtu); 1315 } 1316 SPPP_UNLOCK(sp); 1317 break; 1318 1319 case SIOCGIFMTU: 1320 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1321 error = 0; 1322 break; 1323 case SIOCADDMULTI: 1324 case SIOCDELMULTI: 1325 break; 1326 1327 case SPPPSETAUTHCFG: 1328 case SPPPSETLCPCFG: 1329 case SPPPSETNCPCFG: 1330 case SPPPSETIDLETO: 1331 case SPPPSETAUTHFAILURE: 1332 case SPPPSETDNSOPTS: 1333 case SPPPSETKEEPALIVE: 1334 #if defined(COMPAT_50) || defined(MODULAR) 1335 case __SPPPSETIDLETO50: 1336 case __SPPPSETKEEPALIVE50: 1337 #endif /* COMPAT_50 || MODULAR */ 1338 error = kauth_authorize_network(l->l_cred, 1339 KAUTH_NETWORK_INTERFACE, 1340 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1341 NULL); 1342 if (error) 1343 break; 1344 error = sppp_params(sp, cmd, data); 1345 break; 1346 1347 case SPPPGETAUTHCFG: 1348 case SPPPGETLCPCFG: 1349 case SPPPGETNCPCFG: 1350 case SPPPGETAUTHFAILURES: 1351 error = kauth_authorize_network(l->l_cred, 1352 KAUTH_NETWORK_INTERFACE, 1353 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1354 NULL); 1355 if (error) 1356 break; 1357 error = sppp_params(sp, cmd, data); 1358 break; 1359 1360 case SPPPGETSTATUS: 1361 case SPPPGETSTATUSNCP: 1362 case SPPPGETIDLETO: 1363 case SPPPGETDNSOPTS: 1364 case SPPPGETDNSADDRS: 1365 case SPPPGETKEEPALIVE: 1366 #if defined(COMPAT_50) || defined(MODULAR) 1367 case __SPPPGETIDLETO50: 1368 case __SPPPGETKEEPALIVE50: 1369 #endif /* COMPAT_50 || MODULAR */ 1370 case SPPPGETLCPSTATUS: 1371 case SPPPGETIPCPSTATUS: 1372 case SPPPGETIPV6CPSTATUS: 1373 error = sppp_params(sp, cmd, data); 1374 break; 1375 1376 default: 1377 error = ifioctl_common(ifp, cmd, data); 1378 break; 1379 } 1380 splx(s); 1381 return (error); 1382 } 1383 1384 /* 1385 * PPP protocol implementation. 1386 */ 1387 1388 /* 1389 * Send PPP control protocol packet. 1390 */ 1391 static void 1392 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1393 u_char ident, u_short len, void *data) 1394 { 1395 struct ifnet *ifp; 1396 struct lcp_header *lh; 1397 struct mbuf *m; 1398 size_t pkthdrlen; 1399 1400 KASSERT(SPPP_WLOCKED(sp)); 1401 1402 ifp = &sp->pp_if; 1403 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1404 1405 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1406 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1407 MGETHDR(m, M_DONTWAIT, MT_DATA); 1408 if (! m) { 1409 return; 1410 } 1411 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1412 m_reset_rcvif(m); 1413 1414 if (sp->pp_flags & PP_NOFRAMING) { 1415 *mtod(m, uint16_t *) = htons(proto); 1416 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1417 } else { 1418 struct ppp_header *h; 1419 h = mtod(m, struct ppp_header *); 1420 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1421 h->control = PPP_UI; /* Unnumbered Info */ 1422 h->protocol = htons(proto); /* Link Control Protocol */ 1423 lh = (struct lcp_header *)(h + 1); 1424 } 1425 lh->type = type; 1426 lh->ident = ident; 1427 lh->len = htons(LCP_HEADER_LEN + len); 1428 if (len) 1429 memcpy(lh + 1, data, len); 1430 1431 if (sppp_debug_enabled(sp)) { 1432 char pbuf[SPPP_PROTO_NAMELEN]; 1433 char tbuf[SPPP_CPTYPE_NAMELEN]; 1434 const char *pname, *cpname; 1435 1436 pname = sppp_proto_name(pbuf, sizeof(pbuf), proto); 1437 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), lh->type); 1438 SPPP_LOG(sp, LOG_DEBUG, "%s output <%s id=0x%x len=%d", 1439 pname, cpname, lh->ident, ntohs(lh->len)); 1440 if (len) 1441 sppp_print_bytes((u_char *)(lh + 1), len); 1442 addlog(">\n"); 1443 } 1444 if (IF_QFULL(&sp->pp_cpq)) { 1445 IF_DROP(&sp->pp_fastq); 1446 IF_DROP(&ifp->if_snd); 1447 m_freem(m); 1448 if_statinc(ifp, if_oerrors); 1449 return; 1450 } 1451 1452 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 1453 IF_ENQUEUE(&sp->pp_cpq, m); 1454 1455 if (! (ifp->if_flags & IFF_OACTIVE)) { 1456 SPPP_UNLOCK(sp); 1457 if_start_lock(ifp); 1458 SPPP_LOCK(sp, RW_WRITER); 1459 } 1460 } 1461 1462 static void 1463 sppp_cp_to_lcp(void *xsp) 1464 { 1465 struct sppp *sp = xsp; 1466 1467 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_to); 1468 } 1469 1470 static void 1471 sppp_cp_to_ipcp(void *xsp) 1472 { 1473 struct sppp *sp = xsp; 1474 1475 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_IPCP].work_to); 1476 } 1477 1478 static void 1479 sppp_cp_to_ipv6cp(void *xsp) 1480 { 1481 struct sppp *sp = xsp; 1482 1483 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_IPV6CP].work_to); 1484 } 1485 1486 static void 1487 sppp_cp_to_pap(void *xsp) 1488 { 1489 struct sppp *sp = xsp; 1490 1491 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_PAP].work_to); 1492 } 1493 1494 static void 1495 sppp_cp_to_chap(void *xsp) 1496 { 1497 struct sppp *sp = xsp; 1498 1499 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_to); 1500 } 1501 1502 static void 1503 sppp_cp_init(const struct cp *cp, struct sppp *sp) 1504 { 1505 struct sppp_cp *scp; 1506 typedef void (*sppp_co_cb_t)(void *); 1507 static const sppp_co_cb_t to_cb[IDX_COUNT] = { 1508 [IDX_LCP] = sppp_cp_to_lcp, 1509 [IDX_IPCP] = sppp_cp_to_ipcp, 1510 [IDX_IPV6CP] = sppp_cp_to_ipv6cp, 1511 [IDX_PAP] = sppp_cp_to_pap, 1512 [IDX_CHAP] = sppp_cp_to_chap, 1513 }; 1514 1515 scp = &sp->scp[cp->protoidx]; 1516 scp->state = STATE_INITIAL; 1517 scp->fail_counter = 0; 1518 scp->seq = 0; 1519 scp->rseq = 0; 1520 1521 SPPP_WQ_SET(&scp->work_up, cp->Up, cp); 1522 SPPP_WQ_SET(&scp->work_down, cp->Down, cp); 1523 SPPP_WQ_SET(&scp->work_open, cp->Open, cp); 1524 SPPP_WQ_SET(&scp->work_close, cp->Close, cp); 1525 SPPP_WQ_SET(&scp->work_to, cp->TO, cp); 1526 SPPP_WQ_SET(&scp->work_rcr, sppp_rcr_event, cp); 1527 SPPP_WQ_SET(&scp->work_rca, sppp_rca_event, cp); 1528 SPPP_WQ_SET(&scp->work_rcn, sppp_rcn_event, cp); 1529 SPPP_WQ_SET(&scp->work_rtr, sppp_rtr_event, cp); 1530 SPPP_WQ_SET(&scp->work_rta, sppp_rta_event, cp); 1531 SPPP_WQ_SET(&scp->work_rxj, sppp_rxj_event, cp); 1532 1533 callout_init(&scp->ch, CALLOUT_MPSAFE); 1534 callout_setfunc(&scp->ch, to_cb[cp->protoidx], sp); 1535 } 1536 1537 static void 1538 sppp_cp_fini(const struct cp *cp, struct sppp *sp) 1539 { 1540 struct sppp_cp *scp; 1541 scp = &sp->scp[cp->protoidx]; 1542 1543 sppp_wq_wait(sp->wq_cp, &scp->work_up); 1544 sppp_wq_wait(sp->wq_cp, &scp->work_down); 1545 sppp_wq_wait(sp->wq_cp, &scp->work_open); 1546 sppp_wq_wait(sp->wq_cp, &scp->work_close); 1547 sppp_wq_wait(sp->wq_cp, &scp->work_to); 1548 sppp_wq_wait(sp->wq_cp, &scp->work_rcr); 1549 sppp_wq_wait(sp->wq_cp, &scp->work_rca); 1550 sppp_wq_wait(sp->wq_cp, &scp->work_rcn); 1551 sppp_wq_wait(sp->wq_cp, &scp->work_rtr); 1552 sppp_wq_wait(sp->wq_cp, &scp->work_rta); 1553 sppp_wq_wait(sp->wq_cp, &scp->work_rxj); 1554 1555 callout_halt(&scp->ch, NULL); 1556 callout_destroy(&scp->ch); 1557 1558 if (scp->mbuf_confreq != NULL) { 1559 m_freem(scp->mbuf_confreq); 1560 scp->mbuf_confreq = NULL; 1561 } 1562 if (scp->mbuf_confnak != NULL) { 1563 m_freem(scp->mbuf_confnak); 1564 scp->mbuf_confnak = NULL; 1565 } 1566 } 1567 1568 /* 1569 * Handle incoming PPP control protocol packets. 1570 */ 1571 static void 1572 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1573 { 1574 struct ifnet *ifp; 1575 struct lcp_header *h; 1576 struct sppp_cp *scp; 1577 int printlen, len = m->m_pkthdr.len; 1578 u_char *p; 1579 uint32_t u32; 1580 char tbuf[SPPP_CPTYPE_NAMELEN]; 1581 const char *cpname; 1582 bool debug; 1583 1584 SPPP_LOCK(sp, RW_WRITER); 1585 1586 ifp = &sp->pp_if; 1587 debug = sppp_debug_enabled(sp); 1588 scp = &sp->scp[cp->protoidx]; 1589 1590 if (len < 4) { 1591 SPPP_DLOG(sp, "%s invalid packet length: %d bytes\n", 1592 cp->name, len); 1593 goto out; 1594 } 1595 h = mtod(m, struct lcp_header *); 1596 if (debug) { 1597 printlen = ntohs(h->len); 1598 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), h->type); 1599 SPPP_LOG(sp, LOG_DEBUG, "%s input(%s): <%s id=0x%x len=%d", 1600 cp->name, sppp_state_name(scp->state), 1601 cpname, h->ident, printlen); 1602 if (len < printlen) 1603 printlen = len; 1604 if (printlen > 4) 1605 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1606 addlog(">\n"); 1607 } 1608 if (len > ntohs(h->len)) 1609 len = ntohs(h->len); 1610 p = (u_char *)(h + 1); 1611 switch (h->type) { 1612 case CONF_REQ: 1613 if (len < 4) { 1614 SPPP_DLOG(sp,"%s invalid conf-req length %d\n", 1615 cp->name, len); 1616 if_statinc(ifp, if_ierrors); 1617 break; 1618 } 1619 1620 scp->rcr_type = CP_RCR_NONE; 1621 scp->rconfid = h->ident; 1622 if (scp->mbuf_confreq != NULL) { 1623 m_freem(scp->mbuf_confreq); 1624 } 1625 scp->mbuf_confreq = m; 1626 m = NULL; 1627 sppp_wq_add(sp->wq_cp, &scp->work_rcr); 1628 break; 1629 case CONF_ACK: 1630 if (h->ident != scp->confid) { 1631 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 1632 cp->name, h->ident, scp->confid); 1633 if_statinc(ifp, if_ierrors); 1634 break; 1635 } 1636 sppp_wq_add(sp->wq_cp, &scp->work_rca); 1637 break; 1638 case CONF_NAK: 1639 case CONF_REJ: 1640 if (h->ident != scp->confid) { 1641 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 1642 cp->name, h->ident, scp->confid); 1643 if_statinc(ifp, if_ierrors); 1644 break; 1645 } 1646 1647 if (scp->mbuf_confnak) { 1648 m_freem(scp->mbuf_confnak); 1649 } 1650 scp->mbuf_confnak = m; 1651 m = NULL; 1652 sppp_wq_add(sp->wq_cp, &scp->work_rcn); 1653 break; 1654 case TERM_REQ: 1655 scp->rseq = h->ident; 1656 sppp_wq_add(sp->wq_cp, &scp->work_rtr); 1657 break; 1658 case TERM_ACK: 1659 if (h->ident != scp->confid && 1660 h->ident != scp->seq) { 1661 SPPP_DLOG(sp, "%s id mismatch " 1662 "0x%x != 0x%x and 0x%x != %0lx\n", 1663 cp->name, h->ident, scp->confid, 1664 h->ident, scp->seq); 1665 if_statinc(ifp, if_ierrors); 1666 break; 1667 } 1668 1669 sppp_wq_add(sp->wq_cp, &scp->work_rta); 1670 break; 1671 case CODE_REJ: 1672 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1673 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), h->type); 1674 SPPP_LOG(sp, LOG_INFO, "%s: ignoring RXJ (%s) for code ?, " 1675 "danger will robinson\n", cp->name, cpname); 1676 sppp_wq_add(sp->wq_cp, &scp->work_rxj); 1677 break; 1678 case PROTO_REJ: 1679 { 1680 int catastrophic; 1681 const struct cp *upper; 1682 int i; 1683 uint16_t proto; 1684 1685 catastrophic = 0; 1686 upper = NULL; 1687 proto = p[0] << 8 | p[1]; 1688 for (i = 0; i < IDX_COUNT; i++) { 1689 if (cps[i]->proto == proto) { 1690 upper = cps[i]; 1691 break; 1692 } 1693 } 1694 if (upper == NULL) 1695 catastrophic++; 1696 1697 if (debug) { 1698 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), h->type); 1699 SPPP_LOG(sp, LOG_INFO, 1700 "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1701 cp->name, catastrophic ? '-' : '+', 1702 cpname, proto, upper ? upper->name : "unknown", 1703 upper ? sppp_state_name(sp->scp[upper->protoidx].state) : "?"); 1704 } 1705 1706 /* 1707 * if we got RXJ+ against conf-req, the peer does not implement 1708 * this particular protocol type. terminate the protocol. 1709 */ 1710 if (upper && !catastrophic) { 1711 if (sp->scp[upper->protoidx].state == STATE_REQ_SENT) { 1712 sppp_wq_add(sp->wq_cp, 1713 &sp->scp[upper->protoidx].work_close); 1714 break; 1715 } 1716 } 1717 sppp_wq_add(sp->wq_cp, &scp->work_rxj); 1718 break; 1719 } 1720 case DISC_REQ: 1721 if (cp->proto != PPP_LCP) 1722 goto illegal; 1723 /* Discard the packet. */ 1724 break; 1725 case ECHO_REQ: 1726 if (cp->proto != PPP_LCP) 1727 goto illegal; 1728 if (scp->state != STATE_OPENED) { 1729 SPPP_DLOG(sp, "lcp echo req but lcp closed\n"); 1730 if_statinc(ifp, if_ierrors); 1731 break; 1732 } 1733 if (len < 8) { 1734 SPPP_DLOG(sp, "invalid lcp echo request " 1735 "packet length: %d bytes\n", len); 1736 break; 1737 } 1738 memcpy(&u32, h + 1, sizeof u32); 1739 if (ntohl(u32) == sp->lcp.magic) { 1740 /* Line loopback mode detected. */ 1741 SPPP_DLOG(sp, "loopback\n"); 1742 1743 if (sp->pp_flags & PP_LOOPBACK_IFDOWN) { 1744 sp->pp_flags |= PP_LOOPBACK; 1745 sppp_wq_add(sp->wq_cp, 1746 &sp->work_ifdown); 1747 } 1748 1749 /* Shut down the PPP link. */ 1750 sppp_wq_add(sp->wq_cp, 1751 &sp->scp[IDX_LCP].work_close); 1752 sppp_wq_add(sp->wq_cp, 1753 &sp->scp[IDX_LCP].work_open); 1754 break; 1755 } 1756 u32 = htonl(sp->lcp.magic); 1757 memcpy(h + 1, &u32, sizeof u32); 1758 SPPP_DLOG(sp, "got lcp echo req, sending echo rep\n"); 1759 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1760 h + 1); 1761 break; 1762 case ECHO_REPLY: 1763 if (cp->proto != PPP_LCP) 1764 goto illegal; 1765 if (h->ident != sp->lcp.echoid) { 1766 if_statinc(ifp, if_ierrors); 1767 break; 1768 } 1769 if (len < 8) { 1770 SPPP_DLOG(sp, "lcp invalid echo reply " 1771 "packet length: %d bytes\n", len); 1772 break; 1773 } 1774 SPPP_DLOG(sp, "lcp got echo rep\n"); 1775 memcpy(&u32, h + 1, sizeof u32); 1776 if (ntohl(u32) != sp->lcp.magic) 1777 sp->pp_alivecnt = 0; 1778 break; 1779 default: 1780 /* Unknown packet type -- send Code-Reject packet. */ 1781 illegal: 1782 SPPP_DLOG(sp, "%s send code-rej for 0x%x\n", 1783 cp->name, h->type); 1784 sppp_cp_send(sp, cp->proto, CODE_REJ, 1785 ++scp->seq, m->m_pkthdr.len, h); 1786 if_statinc(ifp, if_ierrors); 1787 } 1788 1789 out: 1790 SPPP_UNLOCK(sp); 1791 if (m != NULL) 1792 m_freem(m); 1793 } 1794 1795 /* 1796 * The generic part of all Up/Down/Open/Close/TO event handlers. 1797 * Basically, the state transition handling in the automaton. 1798 */ 1799 static void 1800 sppp_up_event(struct sppp *sp, void *xcp) 1801 { 1802 const struct cp *cp = xcp; 1803 1804 KASSERT(SPPP_WLOCKED(sp)); 1805 KASSERT(!cpu_softintr_p()); 1806 1807 if ((cp->flags & CP_AUTH) != 0 && 1808 sppp_auth_role(cp, sp) == SPPP_AUTH_NOROLE) 1809 return; 1810 1811 SPPP_DLOG(sp, "%s up(%s)\n", cp->name, 1812 sppp_state_name(sp->scp[cp->protoidx].state)); 1813 1814 switch (sp->scp[cp->protoidx].state) { 1815 case STATE_INITIAL: 1816 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1817 break; 1818 case STATE_STARTING: 1819 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1820 (cp->scr)(sp); 1821 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1822 break; 1823 default: 1824 SPPP_LOG(sp, LOG_DEBUG, 1825 "%s illegal up in state %s\n", cp->name, 1826 sppp_state_name(sp->scp[cp->protoidx].state)); 1827 } 1828 } 1829 1830 static void 1831 sppp_down_event(struct sppp *sp, void *xcp) 1832 { 1833 const struct cp *cp = xcp; 1834 1835 KASSERT(SPPP_WLOCKED(sp)); 1836 KASSERT(!cpu_softintr_p()); 1837 1838 if ((cp->flags & CP_AUTH) != 0 && 1839 sppp_auth_role(cp, sp) == SPPP_AUTH_NOROLE) 1840 return; 1841 1842 SPPP_DLOG(sp, "%s down(%s)\n", cp->name, 1843 sppp_state_name(sp->scp[cp->protoidx].state)); 1844 1845 switch (sp->scp[cp->protoidx].state) { 1846 case STATE_CLOSED: 1847 case STATE_CLOSING: 1848 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1849 break; 1850 case STATE_STOPPED: 1851 (cp->tls)(cp, sp); 1852 /* fall through */ 1853 case STATE_STOPPING: 1854 case STATE_REQ_SENT: 1855 case STATE_ACK_RCVD: 1856 case STATE_ACK_SENT: 1857 sppp_cp_change_state(cp, sp, STATE_STARTING); 1858 break; 1859 case STATE_OPENED: 1860 (cp->tld)(sp); 1861 sppp_cp_change_state(cp, sp, STATE_STARTING); 1862 break; 1863 default: 1864 /* 1865 * a down event may be caused regardless 1866 * of state just in LCP case. 1867 */ 1868 if (cp->proto == PPP_LCP) 1869 break; 1870 1871 SPPP_LOG(sp, LOG_DEBUG, 1872 "%s illegal down in state %s\n", cp->name, 1873 sppp_state_name(sp->scp[cp->protoidx].state)); 1874 } 1875 } 1876 1877 static void 1878 sppp_open_event(struct sppp *sp, void *xcp) 1879 { 1880 const struct cp *cp = xcp; 1881 1882 KASSERT(SPPP_WLOCKED(sp)); 1883 KASSERT(!cpu_softintr_p()); 1884 1885 if ((cp->flags & CP_AUTH) != 0 && 1886 sppp_auth_role(cp, sp) == SPPP_AUTH_NOROLE) 1887 return; 1888 1889 SPPP_DLOG(sp, "%s open(%s)\n", cp->name, 1890 sppp_state_name(sp->scp[cp->protoidx].state)); 1891 1892 switch (sp->scp[cp->protoidx].state) { 1893 case STATE_INITIAL: 1894 sppp_cp_change_state(cp, sp, STATE_STARTING); 1895 (cp->tls)(cp, sp); 1896 break; 1897 case STATE_STARTING: 1898 break; 1899 case STATE_CLOSED: 1900 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1901 (cp->scr)(sp); 1902 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1903 break; 1904 case STATE_STOPPED: 1905 case STATE_STOPPING: 1906 case STATE_REQ_SENT: 1907 case STATE_ACK_RCVD: 1908 case STATE_ACK_SENT: 1909 case STATE_OPENED: 1910 break; 1911 case STATE_CLOSING: 1912 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1913 break; 1914 } 1915 } 1916 1917 static void 1918 sppp_close_event(struct sppp *sp, void *xcp) 1919 { 1920 const struct cp *cp = xcp; 1921 1922 KASSERT(SPPP_WLOCKED(sp)); 1923 KASSERT(!cpu_softintr_p()); 1924 1925 if ((cp->flags & CP_AUTH) != 0 && 1926 sppp_auth_role(cp, sp) == SPPP_AUTH_NOROLE) 1927 return; 1928 1929 SPPP_DLOG(sp, "%s close(%s)\n", cp->name, 1930 sppp_state_name(sp->scp[cp->protoidx].state)); 1931 1932 switch (sp->scp[cp->protoidx].state) { 1933 case STATE_INITIAL: 1934 case STATE_CLOSED: 1935 case STATE_CLOSING: 1936 break; 1937 case STATE_STARTING: 1938 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1939 (cp->tlf)(cp, sp); 1940 break; 1941 case STATE_STOPPED: 1942 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1943 break; 1944 case STATE_STOPPING: 1945 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1946 break; 1947 case STATE_OPENED: 1948 (cp->tld)(sp); 1949 /* fall through */ 1950 case STATE_REQ_SENT: 1951 case STATE_ACK_RCVD: 1952 case STATE_ACK_SENT: 1953 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_terminate; 1954 if ((cp->flags & CP_AUTH) == 0) { 1955 sppp_cp_send(sp, cp->proto, TERM_REQ, 1956 ++sp->scp[cp->protoidx].seq, 0, 0); 1957 } 1958 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1959 break; 1960 } 1961 } 1962 1963 static void 1964 sppp_to_event(struct sppp *sp, void *xcp) 1965 { 1966 const struct cp *cp = xcp; 1967 int s; 1968 1969 KASSERT(SPPP_WLOCKED(sp)); 1970 KASSERT(!cpu_softintr_p()); 1971 1972 s = splnet(); 1973 1974 SPPP_DLOG(sp, "%s TO(%s) rst_counter = %d\n", cp->name, 1975 sppp_state_name(sp->scp[cp->protoidx].state), 1976 sp->scp[cp->protoidx].rst_counter); 1977 1978 if (--sp->scp[cp->protoidx].rst_counter < 0) 1979 /* TO- event */ 1980 switch (sp->scp[cp->protoidx].state) { 1981 case STATE_CLOSING: 1982 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1983 (cp->tlf)(cp, sp); 1984 break; 1985 case STATE_STOPPING: 1986 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1987 (cp->tlf)(cp, sp); 1988 break; 1989 case STATE_REQ_SENT: 1990 case STATE_ACK_RCVD: 1991 case STATE_ACK_SENT: 1992 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1993 (cp->tlf)(cp, sp); 1994 break; 1995 } 1996 else 1997 /* TO+ event */ 1998 switch (sp->scp[cp->protoidx].state) { 1999 case STATE_CLOSING: 2000 case STATE_STOPPING: 2001 if ((cp->flags & CP_AUTH) == 0) { 2002 sppp_cp_send(sp, cp->proto, TERM_REQ, 2003 ++sp->scp[cp->protoidx].seq, 0, 0); 2004 } 2005 callout_schedule(&sp->scp[cp->protoidx].ch, sp->lcp.timeout); 2006 break; 2007 case STATE_REQ_SENT: 2008 case STATE_ACK_RCVD: 2009 (cp->scr)(sp); 2010 /* sppp_cp_change_state() will restart the timer */ 2011 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2012 break; 2013 case STATE_ACK_SENT: 2014 (cp->scr)(sp); 2015 callout_schedule(&sp->scp[cp->protoidx].ch, sp->lcp.timeout); 2016 break; 2017 } 2018 2019 splx(s); 2020 } 2021 static void 2022 sppp_rcr_update_state(const struct cp *cp, struct sppp *sp, 2023 enum cp_rcr_type type, uint8_t ident, size_t msglen, void *msg) 2024 { 2025 struct ifnet *ifp; 2026 u_char ctype; 2027 2028 ifp = &sp->pp_if; 2029 2030 if (type == CP_RCR_ERR) { 2031 /* parse error, shut down */ 2032 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 2033 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_open); 2034 } else if (type == CP_RCR_ACK) { 2035 /* RCR+ event */ 2036 ctype = CONF_ACK; 2037 switch (sp->scp[cp->protoidx].state) { 2038 case STATE_OPENED: 2039 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2040 cp->tld(sp); 2041 cp->scr(sp); 2042 cp->screply(cp, sp, ctype, ident, msglen, msg); 2043 break; 2044 case STATE_REQ_SENT: 2045 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2046 /* fall through */ 2047 case STATE_ACK_SENT: 2048 cp->screply(cp, sp, ctype, ident, msglen, msg); 2049 break; 2050 case STATE_STOPPED: 2051 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2052 cp->scr(sp); 2053 cp->screply(cp, sp, ctype, ident, msglen, msg); 2054 break; 2055 case STATE_ACK_RCVD: 2056 sppp_cp_change_state(cp, sp, STATE_OPENED); 2057 SPPP_DLOG(sp, "%s tlu\n", cp->name); 2058 cp->tlu(sp); 2059 cp->screply(cp, sp, ctype, ident, msglen, msg); 2060 break; 2061 case STATE_CLOSING: 2062 case STATE_STOPPING: 2063 break; 2064 case STATE_CLOSED: 2065 if ((cp->flags & CP_AUTH) == 0) { 2066 sppp_cp_send(sp, cp->proto, TERM_ACK, 2067 ident, 0, 0); 2068 } 2069 break; 2070 default: 2071 SPPP_LOG(sp, LOG_DEBUG, 2072 "%s illegal RCR+ in state %s\n", cp->name, 2073 sppp_state_name(sp->scp[cp->protoidx].state)); 2074 if_statinc(ifp, if_ierrors); 2075 } 2076 } else if (type == CP_RCR_NAK || type == CP_RCR_REJ) { 2077 ctype = type == CP_RCR_NAK ? CONF_NAK : CONF_REJ; 2078 /* RCR- event */ 2079 switch (sp->scp[cp->protoidx].state) { 2080 case STATE_OPENED: 2081 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2082 cp->tld(sp); 2083 cp->scr(sp); 2084 cp->screply(cp, sp, ctype, ident, msglen, msg); 2085 break; 2086 case STATE_ACK_SENT: 2087 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2088 /* fall through */ 2089 case STATE_REQ_SENT: 2090 cp->screply(cp, sp, ctype, ident, msglen, msg); 2091 break; 2092 case STATE_STOPPED: 2093 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2094 cp->scr(sp); 2095 cp->screply(cp, sp, ctype, ident, msglen, msg); 2096 break; 2097 case STATE_ACK_RCVD: 2098 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 2099 cp->screply(cp, sp, ctype, ident, msglen, msg); 2100 break; 2101 case STATE_CLOSING: 2102 case STATE_STOPPING: 2103 break; 2104 case STATE_CLOSED: 2105 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2106 if ((cp->flags & CP_AUTH) == 0) { 2107 sppp_cp_send(sp, cp->proto, TERM_ACK, 2108 ident, 0, 0); 2109 } 2110 break; 2111 default: 2112 SPPP_LOG(sp, LOG_DEBUG, 2113 "%s illegal RCR- in state %s\n", cp->name, 2114 sppp_state_name(sp->scp[cp->protoidx].state)); 2115 if_statinc(ifp, if_ierrors); 2116 } 2117 } 2118 } 2119 2120 static void 2121 sppp_rcr_event(struct sppp *sp, void *xcp) 2122 { 2123 const struct cp *cp = xcp; 2124 struct sppp_cp *scp; 2125 struct lcp_header *h; 2126 struct mbuf *m; 2127 enum cp_rcr_type type; 2128 size_t len; 2129 uint8_t *buf; 2130 size_t blen, rlen; 2131 uint8_t ident; 2132 2133 KASSERT(!cpu_softintr_p()); 2134 2135 scp = &sp->scp[cp->protoidx]; 2136 2137 if (cp->parse_confreq != NULL) { 2138 m = scp->mbuf_confreq; 2139 if (m == NULL) 2140 return; 2141 scp->mbuf_confreq = NULL; 2142 2143 h = mtod(m, struct lcp_header *); 2144 if (h->type != CONF_REQ) { 2145 m_freem(m); 2146 return; 2147 } 2148 2149 ident = h->ident; 2150 len = MIN(m->m_pkthdr.len, ntohs(h->len)); 2151 2152 type = (cp->parse_confreq)(sp, h, len, 2153 &buf, &blen, &rlen); 2154 m_freem(m); 2155 } else { 2156 /* mbuf_cofreq is already parsed and freed */ 2157 type = scp->rcr_type; 2158 ident = scp->rconfid; 2159 buf = NULL; 2160 blen = rlen = 0; 2161 } 2162 2163 sppp_rcr_update_state(cp, sp, type, ident, rlen, (void *)buf); 2164 2165 if (buf != NULL) 2166 kmem_free(buf, blen); 2167 } 2168 2169 static void 2170 sppp_rca_event(struct sppp *sp, void *xcp) 2171 { 2172 struct ifnet *ifp; 2173 const struct cp *cp = xcp; 2174 2175 KASSERT(!cpu_softintr_p()); 2176 2177 ifp = &sp->pp_if; 2178 2179 switch (sp->scp[cp->protoidx].state) { 2180 case STATE_CLOSED: 2181 case STATE_STOPPED: 2182 if ((cp->flags & CP_AUTH) == 0) { 2183 sppp_cp_send(sp, cp->proto, TERM_ACK, 2184 sp->scp[cp->protoidx].rconfid, 0, 0); 2185 } 2186 break; 2187 case STATE_CLOSING: 2188 case STATE_STOPPING: 2189 break; 2190 case STATE_REQ_SENT: 2191 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 2192 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 2193 break; 2194 case STATE_OPENED: 2195 (cp->tld)(sp); 2196 /* fall through */ 2197 case STATE_ACK_RCVD: 2198 (cp->scr)(sp); 2199 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2200 break; 2201 case STATE_ACK_SENT: 2202 sppp_cp_change_state(cp, sp, STATE_OPENED); 2203 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 2204 SPPP_DLOG(sp, "%s tlu\n", cp->name); 2205 (cp->tlu)(sp); 2206 break; 2207 default: 2208 SPPP_LOG(sp, LOG_DEBUG, 2209 "%s illegal RCA in state %s\n", cp->name, 2210 sppp_state_name(sp->scp[cp->protoidx].state)); 2211 if_statinc(ifp, if_ierrors); 2212 } 2213 } 2214 2215 static void 2216 sppp_rcn_event(struct sppp *sp, void *xcp) 2217 { 2218 const struct cp *cp = xcp; 2219 struct sppp_cp *scp; 2220 struct lcp_header *h; 2221 struct mbuf *m; 2222 struct ifnet *ifp = &sp->pp_if; 2223 size_t len; 2224 2225 KASSERT(!cpu_softintr_p()); 2226 2227 scp = &sp->scp[cp->protoidx]; 2228 m = scp->mbuf_confnak; 2229 if (m == NULL) 2230 return; 2231 scp->mbuf_confnak = NULL; 2232 2233 h = mtod(m, struct lcp_header *); 2234 len = MIN(m->m_pkthdr.len, ntohs(h->len)); 2235 2236 switch (h->type) { 2237 case CONF_NAK: 2238 (cp->parse_confnak)(sp, h, len); 2239 break; 2240 case CONF_REJ: 2241 (cp->parse_confrej)(sp, h, len); 2242 break; 2243 default: 2244 m_freem(m); 2245 return; 2246 } 2247 2248 m_freem(m); 2249 2250 switch (scp->state) { 2251 case STATE_CLOSED: 2252 case STATE_STOPPED: 2253 if ((cp->flags & CP_AUTH) == 0) { 2254 sppp_cp_send(sp, cp->proto, TERM_ACK, 2255 scp->rconfid, 0, 0); 2256 } 2257 break; 2258 case STATE_REQ_SENT: 2259 case STATE_ACK_SENT: 2260 scp->rst_counter = sp->lcp.max_configure; 2261 (cp->scr)(sp); 2262 break; 2263 case STATE_OPENED: 2264 (cp->tld)(sp); 2265 /* fall through */ 2266 case STATE_ACK_RCVD: 2267 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2268 (cp->scr)(sp); 2269 break; 2270 case STATE_CLOSING: 2271 case STATE_STOPPING: 2272 break; 2273 default: 2274 SPPP_LOG(sp, LOG_DEBUG, "%s illegal RCN in state %s\n", 2275 cp->name, sppp_state_name(scp->state)); 2276 if_statinc(ifp, if_ierrors); 2277 } 2278 } 2279 2280 static void 2281 sppp_rtr_event(struct sppp *sp, void *xcp) 2282 { 2283 struct ifnet *ifp; 2284 const struct cp *cp = xcp; 2285 2286 KASSERT(!cpu_softintr_p()); 2287 2288 ifp = &sp->pp_if; 2289 2290 switch (sp->scp[cp->protoidx].state) { 2291 case STATE_ACK_RCVD: 2292 case STATE_ACK_SENT: 2293 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2294 break; 2295 case STATE_CLOSED: 2296 case STATE_STOPPED: 2297 case STATE_CLOSING: 2298 case STATE_STOPPING: 2299 case STATE_REQ_SENT: 2300 break; 2301 case STATE_OPENED: 2302 (cp->tld)(sp); 2303 sp->scp[cp->protoidx].rst_counter = 0; 2304 sppp_cp_change_state(cp, sp, STATE_STOPPING); 2305 break; 2306 default: 2307 SPPP_LOG(sp, LOG_DEBUG, "%s illegal RTR in state %s\n", 2308 cp->name, 2309 sppp_state_name(sp->scp[cp->protoidx].state)); 2310 if_statinc(ifp, if_ierrors); 2311 return; 2312 } 2313 2314 /* Send Terminate-Ack packet. */ 2315 SPPP_DLOG(sp, "%s send terminate-ack\n", cp->name); 2316 if ((cp->flags & CP_AUTH) == 0) { 2317 sppp_cp_send(sp, cp->proto, TERM_ACK, 2318 sp->scp[cp->protoidx].rseq, 0, 0); 2319 } 2320 } 2321 2322 static void 2323 sppp_rta_event(struct sppp *sp, void *xcp) 2324 { 2325 const struct cp *cp = xcp; 2326 struct ifnet *ifp = &sp->pp_if; 2327 2328 KASSERT(!cpu_softintr_p()); 2329 2330 switch (sp->scp[cp->protoidx].state) { 2331 case STATE_CLOSED: 2332 case STATE_STOPPED: 2333 case STATE_REQ_SENT: 2334 case STATE_ACK_SENT: 2335 break; 2336 case STATE_CLOSING: 2337 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2338 (cp->tlf)(cp, sp); 2339 break; 2340 case STATE_STOPPING: 2341 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2342 (cp->tlf)(cp, sp); 2343 break; 2344 case STATE_ACK_RCVD: 2345 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2346 break; 2347 case STATE_OPENED: 2348 (cp->tld)(sp); 2349 (cp->scr)(sp); 2350 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 2351 break; 2352 default: 2353 SPPP_LOG(sp, LOG_DEBUG, "%s illegal RTA in state %s\n", 2354 cp->name, sppp_state_name(sp->scp[cp->protoidx].state)); 2355 if_statinc(ifp, if_ierrors); 2356 } 2357 } 2358 2359 static void 2360 sppp_rxj_event(struct sppp *sp, void *xcp) 2361 { 2362 const struct cp *cp = xcp; 2363 struct ifnet *ifp = &sp->pp_if; 2364 2365 KASSERT(!cpu_softintr_p()); 2366 2367 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 2368 switch (sp->scp[cp->protoidx].state) { 2369 case STATE_CLOSED: 2370 case STATE_STOPPED: 2371 case STATE_REQ_SENT: 2372 case STATE_ACK_SENT: 2373 case STATE_CLOSING: 2374 case STATE_STOPPING: 2375 case STATE_OPENED: 2376 break; 2377 case STATE_ACK_RCVD: 2378 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2379 break; 2380 default: 2381 SPPP_LOG(sp, LOG_DEBUG, "%s illegal RXJ- in state %s\n", 2382 cp->name, sppp_state_name(sp->scp[cp->protoidx].state)); 2383 if_statinc(ifp, if_ierrors); 2384 } 2385 } 2386 2387 /* 2388 * Change the state of a control protocol in the state automaton. 2389 * Takes care of starting/stopping the restart timer. 2390 */ 2391 void 2392 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 2393 { 2394 2395 KASSERT(SPPP_WLOCKED(sp)); 2396 2397 sp->scp[cp->protoidx].state = newstate; 2398 callout_stop(&sp->scp[cp->protoidx].ch); 2399 switch (newstate) { 2400 case STATE_INITIAL: 2401 case STATE_STARTING: 2402 case STATE_CLOSED: 2403 case STATE_STOPPED: 2404 case STATE_OPENED: 2405 break; 2406 case STATE_CLOSING: 2407 case STATE_STOPPING: 2408 case STATE_REQ_SENT: 2409 case STATE_ACK_RCVD: 2410 case STATE_ACK_SENT: 2411 callout_schedule(&sp->scp[cp->protoidx].ch, sp->lcp.timeout); 2412 break; 2413 } 2414 } 2415 2416 /* 2417 *--------------------------------------------------------------------------* 2418 * * 2419 * The LCP implementation. * 2420 * * 2421 *--------------------------------------------------------------------------* 2422 */ 2423 static void 2424 sppp_lcp_init(struct sppp *sp) 2425 { 2426 2427 KASSERT(SPPP_WLOCKED(sp)); 2428 2429 sppp_cp_init(&lcp, sp); 2430 2431 SET(sp->lcp.opts, SPPP_LCP_OPT_MAGIC); 2432 sp->lcp.magic = 0; 2433 sp->lcp.protos = 0; 2434 sp->lcp.max_terminate = 2; 2435 sp->lcp.max_configure = 10; 2436 sp->lcp.max_failure = 10; 2437 sp->lcp.tlf_sent = false; 2438 2439 /* 2440 * Initialize counters and timeout values. Note that we don't 2441 * use the 3 seconds suggested in RFC 1661 since we are likely 2442 * running on a fast link. XXX We should probably implement 2443 * the exponential backoff option. Note that these values are 2444 * relevant for all control protocols, not just LCP only. 2445 */ 2446 sp->lcp.timeout = 1 * hz; 2447 } 2448 2449 static void 2450 sppp_lcp_up(struct sppp *sp, void *xcp) 2451 { 2452 struct ifnet *ifp; 2453 const struct cp *cp = xcp; 2454 int pidx; 2455 2456 KASSERT(SPPP_WLOCKED(sp)); 2457 ifp = &sp->pp_if; 2458 2459 pidx = cp->protoidx; 2460 /* Initialize activity timestamp: opening a connection is an activity */ 2461 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2462 2463 /* 2464 * If this interface is passive or dial-on-demand, and we are 2465 * still in Initial state, it means we've got an incoming 2466 * call. Activate the interface. 2467 */ 2468 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2469 ifp->if_flags |= IFF_RUNNING; 2470 if (sp->scp[pidx].state == STATE_INITIAL) { 2471 SPPP_DLOG(sp, "Up event (incoming call)\n"); 2472 sp->pp_flags |= PP_CALLIN; 2473 sppp_wq_add(sp->wq_cp, &sp->scp[pidx].work_open); 2474 } else { 2475 SPPP_DLOG(sp, "Up event\n"); 2476 } 2477 } 2478 2479 sppp_up_event(sp, xcp); 2480 } 2481 2482 static void 2483 sppp_lcp_down(struct sppp *sp, void *xcp) 2484 { 2485 const struct cp *cp = xcp; 2486 struct ifnet *ifp; 2487 int pidx; 2488 2489 KASSERT(SPPP_WLOCKED(sp)); 2490 KASSERT(!cpu_softintr_p()); 2491 2492 ifp = &sp->pp_if; 2493 pidx = cp->protoidx; 2494 sppp_down_event(sp, xcp); 2495 2496 /* 2497 * We need to do tls to restart when a down event is caused 2498 * by the last tlf. 2499 */ 2500 if (sp->scp[pidx].state == STATE_STARTING && 2501 sp->lcp.tlf_sent) { 2502 cp->tls(cp, sp); 2503 sp->lcp.tlf_sent = false; 2504 } 2505 2506 SPPP_DLOG(sp, "Down event (carrier loss)\n"); 2507 2508 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2509 if (sp->lcp.reestablish) 2510 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_open); 2511 } else { 2512 sp->pp_flags &= ~PP_CALLIN; 2513 if (sp->scp[pidx].state != STATE_INITIAL) 2514 sppp_wq_add(sp->wq_cp, &sp->scp[pidx].work_close); 2515 ifp->if_flags &= ~IFF_RUNNING; 2516 } 2517 sp->scp[pidx].fail_counter = 0; 2518 } 2519 2520 static void 2521 sppp_lcp_open(struct sppp *sp, void *xcp) 2522 { 2523 2524 KASSERT(SPPP_WLOCKED(sp)); 2525 KASSERT(!cpu_softintr_p()); 2526 2527 sp->lcp.reestablish = false; 2528 sp->scp[IDX_LCP].fail_counter = 0; 2529 2530 /* the interface was down while waiting for reconnection */ 2531 if ((sp->pp_flags & PP_ADMIN_UP) == 0) 2532 return; 2533 2534 if (sp->pp_if.if_mtu < PP_MTU) { 2535 sp->lcp.mru = sp->pp_if.if_mtu; 2536 SET(sp->lcp.opts, SPPP_LCP_OPT_MRU); 2537 } else { 2538 sp->lcp.mru = PP_MTU; 2539 } 2540 sp->lcp.their_mru = PP_MTU; 2541 2542 /* 2543 * If we are authenticator, negotiate LCP_AUTH 2544 */ 2545 if (sp->hisauth.proto != PPP_NOPROTO) 2546 SET(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO); 2547 else 2548 CLR(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO); 2549 sp->pp_flags &= ~PP_NEEDAUTH; 2550 sppp_open_event(sp, xcp); 2551 } 2552 2553 2554 /* 2555 * Analyze a configure request. Return true if it was agreeable, and 2556 * caused action sca, false if it has been rejected or nak'ed, and 2557 * caused action scn. (The return value is used to make the state 2558 * transition decision in the state automaton.) 2559 */ 2560 static enum cp_rcr_type 2561 sppp_lcp_confreq(struct sppp *sp, struct lcp_header *h, int origlen, 2562 uint8_t **msgbuf, size_t *buflen, size_t *msglen) 2563 { 2564 u_char *buf, *r, *p, l, blen; 2565 enum cp_rcr_type type; 2566 int len, rlen; 2567 uint32_t nmagic; 2568 u_short authproto; 2569 char lbuf[SPPP_LCPOPT_NAMELEN]; 2570 bool debug; 2571 2572 KASSERT(SPPP_WLOCKED(sp)); 2573 2574 debug = sppp_debug_enabled(sp); 2575 2576 if (origlen < sizeof(*h)) 2577 return CP_RCR_DROP; 2578 2579 origlen -= sizeof(*h); 2580 type = CP_RCR_NONE; 2581 type = 0; 2582 2583 if (origlen <= 0) 2584 return CP_RCR_DROP; 2585 else 2586 blen = origlen; 2587 2588 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 2589 if (buf == NULL) 2590 return CP_RCR_DROP; 2591 2592 if (debug) 2593 SPPP_LOG(sp, LOG_DEBUG, "lcp parse opts:"); 2594 2595 /* pass 1: check for things that need to be rejected */ 2596 p = (void *)(h + 1); 2597 r = buf; 2598 rlen = 0; 2599 for (len = origlen; len > 1; len-= l, p += l) { 2600 l = p[1]; 2601 if (l == 0) 2602 break; 2603 2604 /* Sanity check option length */ 2605 if (l > len) { 2606 /* 2607 * Malicious option - drop immediately. 2608 * XXX Maybe we should just RXJ it? 2609 */ 2610 if (debug) 2611 addlog("\n"); 2612 2613 SPPP_LOG(sp, LOG_DEBUG, 2614 "received malicious LCP option 0x%02x, " 2615 "length 0x%02x, (len: 0x%02x) dropping.\n", 2616 p[0], l, len); 2617 type = CP_RCR_ERR; 2618 goto end; 2619 } 2620 if (debug) 2621 addlog(" %s", sppp_lcp_opt_name(lbuf, sizeof(lbuf), *p)); 2622 switch (p[0]) { 2623 case LCP_OPT_MAGIC: 2624 /* Magic number. */ 2625 /* fall through, both are same length */ 2626 case LCP_OPT_ASYNC_MAP: 2627 /* Async control character map. */ 2628 if (len >= 6 || l == 6) 2629 continue; 2630 if (debug) 2631 addlog(" [invalid]"); 2632 break; 2633 case LCP_OPT_MP_EID: 2634 if (len >= l && l >= 3) { 2635 switch (p[2]) { 2636 case 0: if (l==3+ 0) continue;break; 2637 case 2: if (l==3+ 4) continue;break; 2638 case 3: if (l==3+ 6) continue;break; 2639 case 6: if (l==3+16) continue;break; 2640 case 1: /* FALLTHROUGH */ 2641 case 4: if (l<=3+20) continue;break; 2642 case 5: if (l<=3+15) continue;break; 2643 /* XXX should it be default: continue;? */ 2644 } 2645 } 2646 if (debug) 2647 addlog(" [invalid class %d len %d]", p[2], l); 2648 break; 2649 case LCP_OPT_MP_SSNHF: 2650 if (len >= 2 && l == 2) { 2651 if (debug) 2652 addlog(" [rej]"); 2653 break; 2654 } 2655 if (debug) 2656 addlog(" [invalid]"); 2657 break; 2658 case LCP_OPT_MP_MRRU: 2659 /* Multilink maximum received reconstructed unit */ 2660 /* should be fall through, both are same length */ 2661 /* FALLTHROUGH */ 2662 case LCP_OPT_MRU: 2663 /* Maximum receive unit. */ 2664 if (len >= 4 && l == 4) 2665 continue; 2666 if (debug) 2667 addlog(" [invalid]"); 2668 break; 2669 case LCP_OPT_AUTH_PROTO: 2670 if (len < 4) { 2671 if (debug) 2672 addlog(" [invalid]"); 2673 break; 2674 } 2675 authproto = (p[2] << 8) + p[3]; 2676 if (authproto == PPP_CHAP && l != 5) { 2677 if (debug) 2678 addlog(" [invalid chap len]"); 2679 break; 2680 } 2681 if (ISSET(sp->myauth.flags, SPPP_AUTHFLAG_PASSIVEAUTHPROTO)) { 2682 if (authproto == PPP_PAP || authproto == PPP_CHAP) 2683 sp->myauth.proto = authproto; 2684 } 2685 if (sp->myauth.proto == PPP_NOPROTO) { 2686 /* we are not configured to do auth */ 2687 if (debug) 2688 addlog(" [not configured]"); 2689 break; 2690 } 2691 /* 2692 * Remote want us to authenticate, remember this, 2693 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2694 * up. 2695 */ 2696 sp->pp_flags |= PP_NEEDAUTH; 2697 continue; 2698 default: 2699 /* Others not supported. */ 2700 if (debug) 2701 addlog(" [rej]"); 2702 break; 2703 } 2704 if (rlen + l > blen) { 2705 if (debug) 2706 addlog(" [overflow]"); 2707 continue; 2708 } 2709 /* Add the option to rejected list. */ 2710 memcpy(r, p, l); 2711 r += l; 2712 rlen += l; 2713 } 2714 2715 if (rlen > 0) { 2716 type = CP_RCR_REJ; 2717 goto end; 2718 } 2719 2720 if (debug) 2721 addlog("\n"); 2722 2723 /* 2724 * pass 2: check for option values that are unacceptable and 2725 * thus require to be nak'ed. 2726 */ 2727 if (debug) 2728 SPPP_LOG(sp, LOG_DEBUG, "lcp parse opt values:"); 2729 2730 p = (void *)(h + 1); 2731 r = buf; 2732 rlen = 0; 2733 for (len = origlen; len > 0; len -= l, p += l) { 2734 l = p[1]; 2735 if (l == 0) 2736 break; 2737 2738 if (debug) 2739 addlog(" %s", sppp_lcp_opt_name(lbuf, sizeof(lbuf), *p)); 2740 switch (p[0]) { 2741 case LCP_OPT_MAGIC: 2742 /* Magic number -- extract. */ 2743 nmagic = (uint32_t)p[2] << 24 | 2744 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2745 if (nmagic != sp->lcp.magic) { 2746 if (debug) 2747 addlog(" 0x%x", nmagic); 2748 continue; 2749 } 2750 /* 2751 * Local and remote magics equal -- loopback? 2752 */ 2753 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2754 SPPP_DLOG(sp, "loopback\n"); 2755 sp->pp_loopcnt = 0; 2756 2757 if (sp->pp_flags & PP_LOOPBACK_IFDOWN) { 2758 sp->pp_flags |= PP_LOOPBACK; 2759 sppp_wq_add(sp->wq_cp, 2760 &sp->work_ifdown); 2761 } 2762 2763 sppp_wq_add(sp->wq_cp, 2764 &sp->scp[IDX_LCP].work_close); 2765 sppp_wq_add(sp->wq_cp, 2766 &sp->scp[IDX_LCP].work_open); 2767 } else { 2768 if (debug) 2769 addlog(" [glitch]"); 2770 ++sp->pp_loopcnt; 2771 } 2772 /* 2773 * We negate our magic here, and NAK it. If 2774 * we see it later in an NAK packet, we 2775 * suggest a new one. 2776 */ 2777 nmagic = ~sp->lcp.magic; 2778 /* Gonna NAK it. */ 2779 p[2] = nmagic >> 24; 2780 p[3] = nmagic >> 16; 2781 p[4] = nmagic >> 8; 2782 p[5] = nmagic; 2783 break; 2784 2785 case LCP_OPT_ASYNC_MAP: 2786 /* 2787 * Async control character map -- just ignore it. 2788 * 2789 * Quote from RFC 1662, chapter 6: 2790 * To enable this functionality, synchronous PPP 2791 * implementations MUST always respond to the 2792 * Async-Control-Character-Map Configuration 2793 * Option with the LCP Configure-Ack. However, 2794 * acceptance of the Configuration Option does 2795 * not imply that the synchronous implementation 2796 * will do any ACCM mapping. Instead, all such 2797 * octet mapping will be performed by the 2798 * asynchronous-to-synchronous converter. 2799 */ 2800 continue; 2801 2802 case LCP_OPT_MRU: 2803 /* 2804 * Maximum receive unit. Always agreeable, 2805 * but ignored by now. 2806 */ 2807 sp->lcp.their_mru = p[2] * 256 + p[3]; 2808 if (debug) 2809 addlog(" %ld", sp->lcp.their_mru); 2810 continue; 2811 2812 case LCP_OPT_AUTH_PROTO: 2813 authproto = (p[2] << 8) + p[3]; 2814 if (ISSET(sp->myauth.flags, SPPP_AUTHFLAG_PASSIVEAUTHPROTO)) { 2815 if (authproto == PPP_PAP || authproto == PPP_CHAP) 2816 sp->myauth.proto = authproto; 2817 } 2818 if (sp->myauth.proto == authproto) { 2819 if (authproto != PPP_CHAP || p[4] == CHAP_MD5) { 2820 continue; 2821 } 2822 if (debug) 2823 addlog(" [chap without MD5]"); 2824 } else { 2825 if (debug) { 2826 char pbuf1[SPPP_PROTO_NAMELEN]; 2827 char pbuf2[SPPP_PROTO_NAMELEN]; 2828 const char *pname1, *pname2; 2829 2830 pname1 = sppp_proto_name(pbuf1, 2831 sizeof(pbuf1), sp->myauth.proto); 2832 pname2 = sppp_proto_name(pbuf2, 2833 sizeof(pbuf2), authproto); 2834 addlog(" [mine %s != his %s]", 2835 pname1, pname2); 2836 } 2837 } 2838 /* not agreed, nak */ 2839 if (sp->myauth.proto == PPP_CHAP) { 2840 l = 5; 2841 } else { 2842 l = 4; 2843 } 2844 2845 if (rlen + l > blen) { 2846 if (debug) 2847 addlog(" [overflow]"); 2848 continue; 2849 } 2850 2851 r[0] = LCP_OPT_AUTH_PROTO; 2852 r[1] = l; 2853 r[2] = sp->myauth.proto >> 8; 2854 r[3] = sp->myauth.proto & 0xff; 2855 if (sp->myauth.proto == PPP_CHAP) 2856 r[4] = CHAP_MD5; 2857 rlen += l; 2858 r += l; 2859 continue; 2860 case LCP_OPT_MP_EID: 2861 /* 2862 * Endpoint identification. 2863 * Always agreeable, 2864 * but ignored by now. 2865 */ 2866 if (debug) { 2867 addlog(" type %d", p[2]); 2868 sppp_print_bytes(p+3, p[1]-3); 2869 } 2870 continue; 2871 case LCP_OPT_MP_MRRU: 2872 /* 2873 * Maximum received reconstructed unit. 2874 * Always agreeable, 2875 * but ignored by now. 2876 */ 2877 sp->lcp.their_mrru = p[2] * 256 + p[3]; 2878 if (debug) 2879 addlog(" %ld", sp->lcp.their_mrru); 2880 continue; 2881 } 2882 if (rlen + l > blen) { 2883 if (debug) 2884 addlog(" [overflow]"); 2885 continue; 2886 } 2887 /* Add the option to nak'ed list. */ 2888 memcpy(r, p, l); 2889 r += l; 2890 rlen += l; 2891 } 2892 2893 if (rlen > 0) { 2894 if (++sp->scp[IDX_LCP].fail_counter >= sp->lcp.max_failure) { 2895 if (debug) 2896 addlog(" max_failure (%d) exceeded, ", 2897 sp->lcp.max_failure); 2898 type = CP_RCR_REJ; 2899 } else { 2900 type = CP_RCR_NAK; 2901 } 2902 } else { 2903 type = CP_RCR_ACK; 2904 rlen = origlen; 2905 memcpy(r, h + 1, rlen); 2906 sp->scp[IDX_LCP].fail_counter = 0; 2907 sp->pp_loopcnt = 0; 2908 } 2909 2910 end: 2911 if (debug) 2912 addlog("\n"); 2913 2914 if (type == CP_RCR_ERR || type == CP_RCR_DROP) { 2915 if (buf != NULL) 2916 kmem_intr_free(buf, blen); 2917 } else { 2918 *msgbuf = buf; 2919 *buflen = blen; 2920 *msglen = rlen; 2921 } 2922 2923 return type; 2924 } 2925 2926 /* 2927 * Analyze the LCP Configure-Reject option list, and adjust our 2928 * negotiation. 2929 */ 2930 static void 2931 sppp_lcp_confrej(struct sppp *sp, struct lcp_header *h, int len) 2932 { 2933 u_char *p, l; 2934 bool debug; 2935 2936 KASSERT(SPPP_WLOCKED(sp)); 2937 2938 debug = sppp_debug_enabled(sp); 2939 2940 if (len <= sizeof(*h)) 2941 return; 2942 2943 len -= sizeof(*h); 2944 2945 if (debug) 2946 SPPP_LOG(sp, LOG_DEBUG, "lcp rej opts:"); 2947 2948 p = (void *)(h + 1); 2949 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2950 /* Sanity check option length */ 2951 if (l > len) { 2952 /* 2953 * Malicious option - drop immediately. 2954 * XXX Maybe we should just RXJ it? 2955 */ 2956 if (debug) 2957 addlog("\n"); 2958 2959 SPPP_LOG(sp, LOG_DEBUG, 2960 "received malicious LCP option, dropping.\n"); 2961 goto end; 2962 } 2963 if (debug) { 2964 char lbuf[SPPP_LCPOPT_NAMELEN]; 2965 addlog(" %s", sppp_lcp_opt_name(lbuf, sizeof(lbuf), *p)); 2966 } 2967 switch (p[0]) { 2968 case LCP_OPT_MAGIC: 2969 /* Magic number -- can't use it, use 0 */ 2970 CLR(sp->lcp.opts, SPPP_LCP_OPT_MAGIC); 2971 sp->lcp.magic = 0; 2972 break; 2973 case LCP_OPT_MRU: 2974 /* 2975 * We try to negotiate a lower MRU if the underlying 2976 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2977 * peer rejects this lower rate, fallback to the 2978 * default. 2979 */ 2980 if (!debug) { 2981 SPPP_LOG(sp, LOG_INFO, 2982 "peer rejected our MRU of " 2983 "%ld bytes. Defaulting to %d bytes\n", 2984 sp->lcp.mru, PP_MTU); 2985 } 2986 CLR(sp->lcp.opts, SPPP_LCP_OPT_MRU); 2987 sp->lcp.mru = PP_MTU; 2988 break; 2989 case LCP_OPT_AUTH_PROTO: 2990 /* 2991 * Peer doesn't want to authenticate himself, 2992 * deny unless this is a dialout call, and 2993 * SPPP_AUTHFLAG_NOCALLOUT is set. 2994 */ 2995 if ((sp->pp_flags & PP_CALLIN) == 0 && 2996 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2997 if (debug) { 2998 addlog(" [don't insist on auth " 2999 "for callout]"); 3000 } 3001 CLR(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO); 3002 break; 3003 } 3004 if (debug) 3005 addlog("[access denied]\n"); 3006 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 3007 break; 3008 } 3009 } 3010 if (debug) 3011 addlog("\n"); 3012 end: 3013 return; 3014 } 3015 3016 /* 3017 * Analyze the LCP Configure-NAK option list, and adjust our 3018 * negotiation. 3019 */ 3020 static void 3021 sppp_lcp_confnak(struct sppp *sp, struct lcp_header *h, int len) 3022 { 3023 u_char *p, l; 3024 uint32_t magic; 3025 bool debug; 3026 3027 KASSERT(SPPP_WLOCKED(sp)); 3028 3029 if (len <= sizeof(*h)) 3030 return; 3031 3032 debug = sppp_debug_enabled(sp); 3033 len -= sizeof(*h); 3034 3035 if (debug) 3036 SPPP_LOG(sp, LOG_DEBUG, "lcp nak opts:"); 3037 3038 p = (void *)(h + 1); 3039 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3040 /* Sanity check option length */ 3041 if (l > len) { 3042 /* 3043 * Malicious option - drop immediately. 3044 * XXX Maybe we should just RXJ it? 3045 */ 3046 if (debug) 3047 addlog("\n"); 3048 3049 SPPP_LOG(sp, LOG_DEBUG, 3050 "received malicious LCP option, dropping.\n"); 3051 goto end; 3052 } 3053 if (debug) { 3054 char lbuf[SPPP_LCPOPT_NAMELEN]; 3055 addlog(" %s", sppp_lcp_opt_name(lbuf, sizeof(lbuf),*p)); 3056 } 3057 switch (p[0]) { 3058 case LCP_OPT_MAGIC: 3059 /* Magic number -- renegotiate */ 3060 if (ISSET(sp->lcp.opts, SPPP_LCP_OPT_MAGIC) && 3061 len >= 6 && l == 6) { 3062 magic = (uint32_t)p[2] << 24 | 3063 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 3064 /* 3065 * If the remote magic is our negated one, 3066 * this looks like a loopback problem. 3067 * Suggest a new magic to make sure. 3068 */ 3069 if (magic == ~sp->lcp.magic) { 3070 if (debug) 3071 addlog(" magic glitch"); 3072 sp->lcp.magic = cprng_fast32(); 3073 } else { 3074 sp->lcp.magic = magic; 3075 if (debug) 3076 addlog(" %d", magic); 3077 } 3078 } 3079 break; 3080 case LCP_OPT_MRU: 3081 /* 3082 * Peer wants to advise us to negotiate an MRU. 3083 * Agree on it if it's reasonable, or use 3084 * default otherwise. 3085 */ 3086 if (len >= 4 && l == 4) { 3087 u_int mru = p[2] * 256 + p[3]; 3088 if (debug) 3089 addlog(" %d", mru); 3090 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 3091 mru = sp->pp_if.if_mtu; 3092 sp->lcp.mru = mru; 3093 SET(sp->lcp.opts, SPPP_LCP_OPT_MRU); 3094 } 3095 break; 3096 case LCP_OPT_AUTH_PROTO: 3097 /* 3098 * Peer doesn't like our authentication method, 3099 * deny. 3100 */ 3101 if (debug) 3102 addlog("[access denied]\n"); 3103 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 3104 break; 3105 } 3106 } 3107 if (debug) 3108 addlog("\n"); 3109 end: 3110 return; 3111 } 3112 3113 static void 3114 sppp_lcp_tlu(struct sppp *sp) 3115 { 3116 struct ifnet *ifp; 3117 int i; 3118 bool going_up; 3119 3120 KASSERT(SPPP_WLOCKED(sp)); 3121 3122 ifp = &sp->pp_if; 3123 3124 /* unlock for IFNET_LOCK and if_up() */ 3125 SPPP_UNLOCK(sp); 3126 3127 if (! (ifp->if_flags & IFF_UP) && 3128 (ifp->if_flags & IFF_RUNNING)) { 3129 /* Coming out of loopback mode. */ 3130 going_up = true; 3131 if_up(ifp); 3132 } else { 3133 going_up = false; 3134 } 3135 3136 IFNET_LOCK(ifp); 3137 SPPP_LOCK(sp, RW_WRITER); 3138 3139 if (going_up) { 3140 if ((sp->pp_flags & PP_LOOPBACK) == 0) { 3141 SPPP_LOG(sp, LOG_DEBUG, 3142 "interface is going up, " 3143 "but no loopback packet is deteted\n"); 3144 } 3145 sp->pp_flags &= ~PP_LOOPBACK; 3146 } 3147 3148 if (ifp->if_mtu > sp->lcp.their_mru) { 3149 sp->pp_saved_mtu = ifp->if_mtu; 3150 ifp->if_mtu = sp->lcp.their_mru; 3151 SPPP_DLOG(sp, "setting MTU " 3152 "from %"PRIu64" bytes to %"PRIu64" bytes\n", 3153 sp->pp_saved_mtu, ifp->if_mtu); 3154 } 3155 IFNET_UNLOCK(ifp); 3156 3157 if (ISSET(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO) || 3158 (sp->pp_flags & PP_NEEDAUTH) != 0) 3159 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 3160 else 3161 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 3162 3163 /* 3164 * Open all authentication protocols. This is even required 3165 * if we already proceeded to network phase, since it might be 3166 * that remote wants us to authenticate, so we might have to 3167 * send a PAP request. Undesired authentication protocols 3168 * don't do anything when they get an Open event. 3169 */ 3170 for (i = 0; i < IDX_COUNT; i++) 3171 if ((cps[i])->flags & CP_AUTH) { 3172 sppp_wq_add(sp->wq_cp, 3173 &sp->scp[(cps[i])->protoidx].work_open); 3174 } 3175 3176 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 3177 /* Notify all NCPs. */ 3178 for (i = 0; i < IDX_COUNT; i++) 3179 if ((cps[i])->flags & CP_NCP) { 3180 sppp_wq_add(sp->wq_cp, 3181 &sp->scp[(cps[i])->protoidx].work_open); 3182 } 3183 } 3184 3185 /* notify low-level driver of state change */ 3186 sppp_notify_chg_wlocked(sp); 3187 } 3188 3189 static void 3190 sppp_lcp_tld(struct sppp *sp) 3191 { 3192 struct ifnet *ifp; 3193 int i, pi, phase; 3194 3195 KASSERT(SPPP_WLOCKED(sp)); 3196 3197 phase = sp->pp_phase; 3198 3199 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 3200 3201 if (sp->pp_saved_mtu > 0) { 3202 ifp = &sp->pp_if; 3203 3204 SPPP_UNLOCK(sp); 3205 IFNET_LOCK(ifp); 3206 SPPP_LOCK(sp, RW_WRITER); 3207 3208 SPPP_DLOG(sp, "setting MTU " 3209 "from %"PRIu64" bytes to %"PRIu64" bytes\n", 3210 ifp->if_mtu, sp->pp_saved_mtu); 3211 3212 ifp->if_mtu = sp->pp_saved_mtu; 3213 sp->pp_saved_mtu = 0; 3214 IFNET_UNLOCK(ifp); 3215 } 3216 3217 /* 3218 * Take upper layers down. We send the Down event first and 3219 * the Close second to prevent the upper layers from sending 3220 * ``a flurry of terminate-request packets'', as the RFC 3221 * describes it. 3222 */ 3223 for (i = 0; i < IDX_COUNT; i++) { 3224 pi = (cps[i])->protoidx; 3225 if (((cps[i])->flags & CP_LCP) == 0) { 3226 /* skip if ncp was not started */ 3227 if (phase != SPPP_PHASE_NETWORK && 3228 ((cps[i])->flags & CP_NCP) != 0) 3229 continue; 3230 3231 sppp_wq_add(sp->wq_cp, &sp->scp[pi].work_down); 3232 sppp_wq_add(sp->wq_cp, &sp->scp[pi].work_close); 3233 } 3234 } 3235 } 3236 3237 static void 3238 sppp_lcp_tls(const struct cp *cp __unused, struct sppp *sp) 3239 { 3240 3241 KASSERT(SPPP_WLOCKED(sp)); 3242 3243 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 3244 3245 /* Notify lower layer if desired. */ 3246 sppp_notify_tls_wlocked(sp); 3247 sp->lcp.tlf_sent = false; 3248 } 3249 3250 static void 3251 sppp_lcp_tlf(const struct cp *cp __unused, struct sppp *sp) 3252 { 3253 3254 KASSERT(SPPP_WLOCKED(sp)); 3255 3256 sppp_change_phase(sp, SPPP_PHASE_DEAD); 3257 3258 /* Notify lower layer if desired. */ 3259 sppp_notify_tlf_wlocked(sp); 3260 3261 switch (sp->scp[IDX_LCP].state) { 3262 case STATE_CLOSED: 3263 case STATE_STOPPED: 3264 sp->lcp.tlf_sent = true; 3265 break; 3266 case STATE_INITIAL: 3267 default: 3268 /* just in case */ 3269 sp->lcp.tlf_sent = false; 3270 } 3271 } 3272 3273 static void 3274 sppp_lcp_scr(struct sppp *sp) 3275 { 3276 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 3277 int i = 0; 3278 u_short authproto; 3279 3280 KASSERT(SPPP_WLOCKED(sp)); 3281 3282 if (ISSET(sp->lcp.opts, SPPP_LCP_OPT_MAGIC)) { 3283 if (! sp->lcp.magic) 3284 sp->lcp.magic = cprng_fast32(); 3285 opt[i++] = LCP_OPT_MAGIC; 3286 opt[i++] = 6; 3287 opt[i++] = sp->lcp.magic >> 24; 3288 opt[i++] = sp->lcp.magic >> 16; 3289 opt[i++] = sp->lcp.magic >> 8; 3290 opt[i++] = sp->lcp.magic; 3291 } 3292 3293 if (ISSET(sp->lcp.opts,SPPP_LCP_OPT_MRU)) { 3294 opt[i++] = LCP_OPT_MRU; 3295 opt[i++] = 4; 3296 opt[i++] = sp->lcp.mru >> 8; 3297 opt[i++] = sp->lcp.mru; 3298 } 3299 3300 if (ISSET(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO)) { 3301 authproto = sp->hisauth.proto; 3302 opt[i++] = LCP_OPT_AUTH_PROTO; 3303 opt[i++] = authproto == PPP_CHAP? 5: 4; 3304 opt[i++] = authproto >> 8; 3305 opt[i++] = authproto; 3306 if (authproto == PPP_CHAP) 3307 opt[i++] = CHAP_MD5; 3308 } 3309 3310 sp->scp[IDX_LCP].confid = ++sp->scp[IDX_LCP].seq; 3311 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->scp[IDX_LCP].confid, i, &opt); 3312 } 3313 3314 /* 3315 * Check the open NCPs, return true if at least one NCP is open. 3316 */ 3317 3318 static int 3319 sppp_cp_check(struct sppp *sp, u_char cp_flags) 3320 { 3321 int i, mask; 3322 3323 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 3324 if ((sp->lcp.protos & mask) && (cps[i])->flags & cp_flags) 3325 return 1; 3326 return 0; 3327 } 3328 3329 /* 3330 * Re-check the open NCPs and see if we should terminate the link. 3331 * Called by the NCPs during their tlf action handling. 3332 */ 3333 static void 3334 sppp_lcp_check_and_close(struct sppp *sp) 3335 { 3336 3337 KASSERT(SPPP_WLOCKED(sp)); 3338 3339 if (sp->pp_phase < SPPP_PHASE_AUTHENTICATE) { 3340 /* don't bother, we are already going down */ 3341 return; 3342 } 3343 3344 if (sp->pp_phase == SPPP_PHASE_AUTHENTICATE && 3345 sppp_cp_check(sp, CP_AUTH)) 3346 return; 3347 3348 if (sp->pp_phase >= SPPP_PHASE_NETWORK && 3349 sppp_cp_check(sp, CP_NCP)) 3350 return; 3351 3352 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 3353 3354 if (sp->pp_max_auth_fail != 0 && 3355 sp->pp_auth_failures >= sp->pp_max_auth_fail) { 3356 SPPP_LOG(sp, LOG_INFO, "authentication failed %d times, " 3357 "not retrying again\n", sp->pp_auth_failures); 3358 3359 sppp_wq_add(sp->wq_cp, &sp->work_ifdown); 3360 sp->pp_if.if_flags &= ~IFF_RUNNING; 3361 } else { 3362 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_open); 3363 } 3364 } 3365 3366 /* 3367 *--------------------------------------------------------------------------* 3368 * * 3369 * The IPCP implementation. * 3370 * * 3371 *--------------------------------------------------------------------------* 3372 */ 3373 3374 static void 3375 sppp_ipcp_init(struct sppp *sp) 3376 { 3377 3378 KASSERT(SPPP_WLOCKED(sp)); 3379 3380 sppp_cp_init(&ipcp, sp); 3381 3382 sp->ipcp.opts = 0; 3383 sp->ipcp.flags = 0; 3384 } 3385 3386 static void 3387 sppp_ipcp_open(struct sppp *sp, void *xcp) 3388 { 3389 uint32_t myaddr, hisaddr; 3390 3391 KASSERT(SPPP_WLOCKED(sp)); 3392 KASSERT(!cpu_softintr_p()); 3393 3394 if (!ISSET(sp->pp_ncpflags, SPPP_NCP_IPCP)) 3395 return; 3396 3397 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 3398 sp->ipcp.req_myaddr = 0; 3399 sp->ipcp.req_hisaddr = 0; 3400 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 3401 3402 #ifdef INET 3403 kpreempt_disable(); 3404 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3405 kpreempt_enable(); 3406 #else 3407 myaddr = hisaddr = 0; 3408 #endif 3409 /* 3410 * If we don't have his address, this probably means our 3411 * interface doesn't want to talk IP at all. (This could 3412 * be the case if somebody wants to speak only IPX, for 3413 * example.) Don't open IPCP in this case. 3414 */ 3415 if (hisaddr == 0) { 3416 /* XXX this message should go away */ 3417 SPPP_DLOG(sp, "ipcp_open(): no IP interface\n"); 3418 return; 3419 } 3420 3421 if (myaddr == 0) { 3422 /* 3423 * I don't have an assigned address, so i need to 3424 * negotiate my address. 3425 */ 3426 sp->ipcp.flags |= IPCP_MYADDR_DYN; 3427 SET(sp->ipcp.opts, SPPP_IPCP_OPT_ADDRESS); 3428 } 3429 if (hisaddr == 1) { 3430 /* 3431 * XXX - remove this hack! 3432 * remote has no valid address, we need to get one assigned. 3433 */ 3434 sp->ipcp.flags |= IPCP_HISADDR_DYN; 3435 sp->ipcp.saved_hisaddr = htonl(hisaddr); 3436 } 3437 3438 if (sp->query_dns & 1) { 3439 SET(sp->ipcp.opts, SPPP_IPCP_OPT_PRIMDNS); 3440 } else { 3441 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_PRIMDNS); 3442 } 3443 3444 if (sp->query_dns & 2) { 3445 SET(sp->ipcp.opts, SPPP_IPCP_OPT_SECDNS); 3446 } else { 3447 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_SECDNS); 3448 } 3449 sppp_open_event(sp, xcp); 3450 } 3451 3452 static void 3453 sppp_ipcp_close(struct sppp *sp, void *xcp) 3454 { 3455 3456 KASSERT(SPPP_WLOCKED(sp)); 3457 KASSERT(!cpu_softintr_p()); 3458 3459 sppp_close_event(sp, xcp); 3460 3461 #ifdef INET 3462 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) { 3463 /* 3464 * Some address was dynamic, clear it again. 3465 */ 3466 sppp_clear_ip_addrs(sp); 3467 } 3468 #endif 3469 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 3470 } 3471 3472 /* 3473 * Analyze a configure request. Return true if it was agreeable, and 3474 * caused action sca, false if it has been rejected or nak'ed, and 3475 * caused action scn. (The return value is used to make the state 3476 * transition decision in the state automaton.) 3477 */ 3478 static enum cp_rcr_type 3479 sppp_ipcp_confreq(struct sppp *sp, struct lcp_header *h, int origlen, 3480 uint8_t **msgbuf, size_t *buflen, size_t *msglen) 3481 { 3482 u_char *buf, *r, *p, l, blen; 3483 enum cp_rcr_type type; 3484 int rlen, len; 3485 uint32_t hisaddr, desiredaddr; 3486 char ipbuf[SPPP_IPCPOPT_NAMELEN]; 3487 char dqbuf[SPPP_DOTQUAD_BUFLEN]; 3488 const char *dq; 3489 bool debug; 3490 3491 KASSERT(SPPP_WLOCKED(sp)); 3492 3493 type = CP_RCR_NONE; 3494 origlen -= sizeof(*h); 3495 3496 if (origlen < 0) 3497 return CP_RCR_DROP; 3498 3499 debug = sppp_debug_enabled(sp); 3500 3501 /* 3502 * Make sure to allocate a buf that can at least hold a 3503 * conf-nak with an `address' option. We might need it below. 3504 */ 3505 blen = MAX(6, origlen); 3506 3507 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 3508 if (buf == NULL) 3509 return CP_RCR_DROP; 3510 3511 /* pass 1: see if we can recognize them */ 3512 if (debug) 3513 SPPP_LOG(sp, LOG_DEBUG, "ipcp parse opts:"); 3514 p = (void *)(h + 1); 3515 r = buf; 3516 rlen = 0; 3517 for (len = origlen; len > 1; len -= l, p += l) { 3518 l = p[1]; 3519 if (l == 0) 3520 break; 3521 3522 /* Sanity check option length */ 3523 if (l > len) { 3524 /* XXX should we just RXJ? */ 3525 if (debug) 3526 addlog("\n"); 3527 3528 SPPP_LOG(sp, LOG_DEBUG, 3529 " malicious IPCP option received, dropping\n"); 3530 type = CP_RCR_ERR; 3531 goto end; 3532 } 3533 if (debug) { 3534 addlog(" %s", 3535 sppp_ipcp_opt_name(ipbuf, sizeof(ipbuf), *p)); 3536 } 3537 switch (p[0]) { 3538 #ifdef notyet 3539 case IPCP_OPT_COMPRESSION: 3540 if (len >= 6 && l >= 6) { 3541 /* correctly formed compress option */ 3542 continue; 3543 } 3544 if (debug) 3545 addlog(" [invalid]"); 3546 break; 3547 #endif 3548 case IPCP_OPT_ADDRESS: 3549 if (len >= 6 && l == 6) { 3550 /* correctly formed address option */ 3551 continue; 3552 } 3553 if (debug) 3554 addlog(" [invalid]"); 3555 break; 3556 default: 3557 /* Others not supported. */ 3558 if (debug) 3559 addlog(" [rej]"); 3560 break; 3561 } 3562 /* Add the option to rejected list. */ 3563 if (rlen + l > blen) { 3564 if (debug) 3565 addlog(" [overflow]"); 3566 continue; 3567 } 3568 memcpy(r, p, l); 3569 r += l; 3570 rlen += l; 3571 } 3572 3573 if (rlen > 0) { 3574 type = CP_RCR_REJ; 3575 goto end; 3576 } 3577 3578 if (debug) 3579 addlog("\n"); 3580 3581 /* pass 2: parse option values */ 3582 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 3583 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 3584 else 3585 #ifdef INET 3586 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 3587 #else 3588 hisaddr = 0; 3589 #endif 3590 if (debug) 3591 SPPP_LOG(sp, LOG_DEBUG, "ipcp parse opt values:"); 3592 p = (void *)(h + 1); 3593 r = buf; 3594 rlen = 0; 3595 for (len = origlen; len > 1; len -= l, p += l) { 3596 l = p[1]; 3597 if (l == 0) 3598 break; 3599 3600 if (debug) { 3601 addlog(" %s", 3602 sppp_ipcp_opt_name(ipbuf, sizeof(ipbuf), *p)); 3603 } 3604 switch (p[0]) { 3605 #ifdef notyet 3606 case IPCP_OPT_COMPRESSION: 3607 continue; 3608 #endif 3609 case IPCP_OPT_ADDRESS: 3610 desiredaddr = p[2] << 24 | p[3] << 16 | 3611 p[4] << 8 | p[5]; 3612 if (desiredaddr == hisaddr || 3613 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 3614 /* 3615 * Peer's address is same as our value, 3616 * this is agreeable. Gonna conf-ack 3617 * it. 3618 */ 3619 if (debug) { 3620 dq = sppp_dotted_quad(dqbuf, 3621 sizeof(dqbuf), hisaddr); 3622 addlog(" %s [ack]", dq); 3623 } 3624 /* record that we've seen it already */ 3625 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3626 sp->ipcp.req_hisaddr = desiredaddr; 3627 hisaddr = desiredaddr; 3628 continue; 3629 } 3630 /* 3631 * The address wasn't agreeable. This is either 3632 * he sent us 0.0.0.0, asking to assign him an 3633 * address, or he send us another address not 3634 * matching our value. Either case, we gonna 3635 * conf-nak it with our value. 3636 */ 3637 if (debug) { 3638 if (desiredaddr == 0) { 3639 addlog(" [addr requested]"); 3640 } else { 3641 dq = sppp_dotted_quad(dqbuf, 3642 sizeof(dqbuf), desiredaddr); 3643 addlog(" %s [not agreed]", dq); 3644 } 3645 } 3646 3647 p[2] = hisaddr >> 24; 3648 p[3] = hisaddr >> 16; 3649 p[4] = hisaddr >> 8; 3650 p[5] = hisaddr; 3651 break; 3652 } 3653 if (rlen + l > blen) { 3654 if (debug) 3655 addlog(" [overflow]"); 3656 continue; 3657 } 3658 /* Add the option to nak'ed list. */ 3659 memcpy(r, p, l); 3660 r += l; 3661 rlen += l; 3662 } 3663 3664 if (rlen > 0) { 3665 type = CP_RCR_NAK; 3666 } else { 3667 if ((sp->ipcp.flags & IPCP_HISADDR_SEEN) == 0) { 3668 /* 3669 * If we are about to conf-ack the request, but haven't seen 3670 * his address so far, gonna conf-nak it instead, with the 3671 * `address' option present and our idea of his address being 3672 * filled in there, to request negotiation of both addresses. 3673 * 3674 * XXX This can result in an endless req - nak loop if peer 3675 * doesn't want to send us his address. Q: What should we do 3676 * about it? XXX A: implement the max-failure counter. 3677 */ 3678 buf[0] = IPCP_OPT_ADDRESS; 3679 buf[1] = 6; 3680 buf[2] = hisaddr >> 24; 3681 buf[3] = hisaddr >> 16; 3682 buf[4] = hisaddr >> 8; 3683 buf[5] = hisaddr; 3684 rlen = 6; 3685 if (debug) 3686 addlog(" still need hisaddr"); 3687 type = CP_RCR_NAK; 3688 } else { 3689 type = CP_RCR_ACK; 3690 rlen = origlen; 3691 memcpy(r, h + 1, rlen); 3692 } 3693 } 3694 3695 end: 3696 if (debug) 3697 addlog("\n"); 3698 3699 if (type == CP_RCR_ERR || type == CP_RCR_DROP) { 3700 if (buf != NULL) 3701 kmem_intr_free(buf, blen); 3702 } else { 3703 *msgbuf = buf; 3704 *buflen = blen; 3705 *msglen = rlen; 3706 } 3707 3708 return type; 3709 } 3710 3711 /* 3712 * Analyze the IPCP Configure-Reject option list, and adjust our 3713 * negotiation. 3714 */ 3715 static void 3716 sppp_ipcp_confrej(struct sppp *sp, struct lcp_header *h, int len) 3717 { 3718 u_char *p, l; 3719 bool debug; 3720 3721 KASSERT(SPPP_WLOCKED(sp)); 3722 3723 if (len <= sizeof(*h)) 3724 return; 3725 3726 len -= sizeof(*h); 3727 debug = sppp_debug_enabled(sp); 3728 3729 if (debug) 3730 SPPP_LOG(sp, LOG_DEBUG, "ipcp rej opts:"); 3731 3732 p = (void *)(h + 1); 3733 for (; len > 1; len -= l, p += l) { 3734 l = p[1]; 3735 if (l == 0) 3736 break; 3737 3738 /* Sanity check option length */ 3739 if (l > len) { 3740 /* XXX should we just RXJ? */ 3741 if (debug) 3742 addlog("\n"); 3743 SPPP_LOG(sp, LOG_DEBUG, 3744 "malicious IPCP option received, dropping\n"); 3745 goto end; 3746 } 3747 if (debug) { 3748 char ipbuf[SPPP_IPCPOPT_NAMELEN]; 3749 addlog(" %s", 3750 sppp_ipcp_opt_name(ipbuf, sizeof(ipbuf), *p)); 3751 } 3752 switch (p[0]) { 3753 case IPCP_OPT_ADDRESS: 3754 /* 3755 * Peer doesn't grok address option. This is 3756 * bad. XXX Should we better give up here? 3757 */ 3758 if (!debug) { 3759 SPPP_LOG(sp, LOG_ERR, 3760 "IPCP address option rejected\n"); 3761 } 3762 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_ADDRESS); 3763 break; 3764 #ifdef notyet 3765 case IPCP_OPT_COMPRESS: 3766 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_COMPRESS); 3767 break; 3768 #endif 3769 case IPCP_OPT_PRIMDNS: 3770 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_PRIMDNS); 3771 break; 3772 3773 case IPCP_OPT_SECDNS: 3774 CLR(sp->ipcp.opts, SPPP_IPCP_OPT_SECDNS); 3775 break; 3776 } 3777 } 3778 if (debug) 3779 addlog("\n"); 3780 end: 3781 return; 3782 } 3783 3784 /* 3785 * Analyze the IPCP Configure-NAK option list, and adjust our 3786 * negotiation. 3787 */ 3788 static void 3789 sppp_ipcp_confnak(struct sppp *sp, struct lcp_header *h, int len) 3790 { 3791 u_char *p, l; 3792 struct ifnet *ifp = &sp->pp_if; 3793 int debug = ifp->if_flags & IFF_DEBUG; 3794 uint32_t wantaddr; 3795 3796 KASSERT(SPPP_WLOCKED(sp)); 3797 3798 len -= sizeof(*h); 3799 3800 debug = sppp_debug_enabled(sp); 3801 3802 if (debug) 3803 SPPP_LOG(sp, LOG_DEBUG, "ipcp nak opts:"); 3804 3805 p = (void *)(h + 1); 3806 for (; len > 1; len -= l, p += l) { 3807 l = p[1]; 3808 if (l == 0) 3809 break; 3810 3811 /* Sanity check option length */ 3812 if (l > len) { 3813 /* XXX should we just RXJ? */ 3814 if (debug) 3815 addlog("\n"); 3816 SPPP_LOG(sp, LOG_DEBUG, 3817 "malicious IPCP option received, dropping\n"); 3818 return; 3819 } 3820 if (debug) { 3821 char ipbuf[SPPP_IPCPOPT_NAMELEN]; 3822 addlog(" %s", 3823 sppp_ipcp_opt_name(ipbuf, sizeof(ipbuf), *p)); 3824 } 3825 switch (*p) { 3826 case IPCP_OPT_ADDRESS: 3827 /* 3828 * Peer doesn't like our local IP address. See 3829 * if we can do something for him. We'll drop 3830 * him our address then. 3831 */ 3832 if (len >= 6 && l == 6) { 3833 wantaddr = p[2] << 24 | p[3] << 16 | 3834 p[4] << 8 | p[5]; 3835 SET(sp->ipcp.opts, SPPP_IPCP_OPT_ADDRESS); 3836 if (debug) { 3837 char dqbuf[SPPP_DOTQUAD_BUFLEN]; 3838 const char *dq; 3839 3840 dq = sppp_dotted_quad(dqbuf, 3841 sizeof(dqbuf), wantaddr); 3842 addlog(" [wantaddr %s]", dq); 3843 } 3844 /* 3845 * When doing dynamic address assignment, 3846 * we accept his offer. Otherwise, we 3847 * ignore it and thus continue to negotiate 3848 * our already existing value. 3849 */ 3850 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3851 if (ntohl(wantaddr) != INADDR_ANY) { 3852 if (debug) 3853 addlog(" [agree]"); 3854 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3855 sp->ipcp.req_myaddr = wantaddr; 3856 } else { 3857 if (debug) 3858 addlog(" [not agreed]"); 3859 } 3860 } 3861 } 3862 break; 3863 3864 case IPCP_OPT_PRIMDNS: 3865 if (ISSET(sp->ipcp.opts, SPPP_IPCP_OPT_PRIMDNS) && 3866 len >= 6 && l == 6) { 3867 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3868 p[4] << 8 | p[5]; 3869 } 3870 break; 3871 3872 case IPCP_OPT_SECDNS: 3873 if (ISSET(sp->ipcp.opts, SPPP_IPCP_OPT_SECDNS) && 3874 len >= 6 && l == 6) { 3875 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3876 p[4] << 8 | p[5]; 3877 } 3878 break; 3879 #ifdef notyet 3880 case IPCP_OPT_COMPRESS: 3881 /* 3882 * Peer wants different compression parameters. 3883 */ 3884 break; 3885 #endif 3886 } 3887 } 3888 if (debug) 3889 addlog("\n"); 3890 } 3891 3892 static void 3893 sppp_ipcp_tlu(struct sppp *sp) 3894 { 3895 #ifdef INET 3896 struct ifnet *ifp; 3897 3898 KASSERT(SPPP_WLOCKED(sp)); 3899 3900 SPPP_LOG(sp, LOG_INFO, "IPCP layer up\n"); 3901 ifp = &sp->pp_if; 3902 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && 3903 ((sp->ipcp.flags & IPCP_MYADDR_SEEN) == 0)) { 3904 SPPP_LOG(sp, LOG_WARNING, 3905 "no IP address, closing IPCP\n"); 3906 sppp_wq_add(sp->wq_cp, 3907 &sp->scp[IDX_IPCP].work_close); 3908 } else { 3909 /* we are up. Set addresses and notify anyone interested */ 3910 sppp_set_ip_addrs(sp); 3911 rt_ifmsg(ifp); 3912 } 3913 #endif 3914 } 3915 3916 static void 3917 sppp_ipcp_tld(struct sppp *sp) 3918 { 3919 #ifdef INET 3920 struct ifnet *ifp; 3921 3922 KASSERT(SPPP_WLOCKED(sp)); 3923 3924 SPPP_LOG(sp, LOG_INFO, "IPCP layer down\n"); 3925 ifp = &sp->pp_if; 3926 rt_ifmsg(ifp); 3927 #endif 3928 } 3929 3930 static void 3931 sppp_ipcp_scr(struct sppp *sp) 3932 { 3933 uint8_t opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3934 #ifdef INET 3935 uint32_t ouraddr; 3936 #endif 3937 int i = 0; 3938 3939 KASSERT(SPPP_WLOCKED(sp)); 3940 3941 #ifdef notyet 3942 if (ISSET(sp->ipcp.opts,SPPP_IPCP_OPT_COMPRESSION)) { 3943 opt[i++] = IPCP_OPT_COMPRESSION; 3944 opt[i++] = 6; 3945 opt[i++] = 0; /* VJ header compression */ 3946 opt[i++] = 0x2d; /* VJ header compression */ 3947 opt[i++] = max_slot_id; 3948 opt[i++] = comp_slot_id; 3949 } 3950 #endif 3951 3952 #ifdef INET 3953 if (ISSET(sp->ipcp.opts, SPPP_IPCP_OPT_ADDRESS)) { 3954 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) { 3955 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3956 } else { 3957 kpreempt_disable(); 3958 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3959 kpreempt_enable(); 3960 } 3961 opt[i++] = IPCP_OPT_ADDRESS; 3962 opt[i++] = 6; 3963 opt[i++] = ouraddr >> 24; 3964 opt[i++] = ouraddr >> 16; 3965 opt[i++] = ouraddr >> 8; 3966 opt[i++] = ouraddr; 3967 } 3968 #endif 3969 3970 if (ISSET(sp->ipcp.opts, SPPP_IPCP_OPT_PRIMDNS)) { 3971 opt[i++] = IPCP_OPT_PRIMDNS; 3972 opt[i++] = 6; 3973 opt[i++] = sp->dns_addrs[0] >> 24; 3974 opt[i++] = sp->dns_addrs[0] >> 16; 3975 opt[i++] = sp->dns_addrs[0] >> 8; 3976 opt[i++] = sp->dns_addrs[0]; 3977 } 3978 if (ISSET(sp->ipcp.opts, SPPP_IPCP_OPT_SECDNS)) { 3979 opt[i++] = IPCP_OPT_SECDNS; 3980 opt[i++] = 6; 3981 opt[i++] = sp->dns_addrs[1] >> 24; 3982 opt[i++] = sp->dns_addrs[1] >> 16; 3983 opt[i++] = sp->dns_addrs[1] >> 8; 3984 opt[i++] = sp->dns_addrs[1]; 3985 } 3986 3987 sp->scp[IDX_IPCP].confid = ++sp->scp[IDX_IPCP].seq; 3988 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->scp[IDX_IPCP].confid, i, &opt); 3989 } 3990 3991 /* 3992 *--------------------------------------------------------------------------* 3993 * * 3994 * The IPv6CP implementation. * 3995 * * 3996 *--------------------------------------------------------------------------* 3997 */ 3998 3999 #ifdef INET6 4000 static void 4001 sppp_ipv6cp_init(struct sppp *sp) 4002 { 4003 4004 KASSERT(SPPP_WLOCKED(sp)); 4005 4006 sppp_cp_init(&ipv6cp, sp); 4007 4008 sp->ipv6cp.opts = 0; 4009 sp->ipv6cp.flags = 0; 4010 } 4011 4012 static void 4013 sppp_ipv6cp_open(struct sppp *sp, void *xcp) 4014 { 4015 struct in6_addr myaddr, hisaddr; 4016 4017 KASSERT(SPPP_WLOCKED(sp)); 4018 KASSERT(!cpu_softintr_p()); 4019 4020 if (!ISSET(sp->pp_ncpflags, SPPP_NCP_IPV6CP)) 4021 return; 4022 4023 #ifdef IPV6CP_MYIFID_DYN 4024 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 4025 #else 4026 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 4027 #endif 4028 4029 kpreempt_disable(); 4030 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 4031 kpreempt_enable(); 4032 /* 4033 * If we don't have our address, this probably means our 4034 * interface doesn't want to talk IPv6 at all. (This could 4035 * be the case if somebody wants to speak only IPX, for 4036 * example.) Don't open IPv6CP in this case. 4037 */ 4038 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 4039 /* XXX this message should go away */ 4040 SPPP_DLOG(sp, "ipv6cp_open(): no IPv6 interface\n"); 4041 return; 4042 } 4043 4044 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 4045 SET(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_IFID); 4046 sppp_open_event(sp, xcp); 4047 } 4048 4049 /* 4050 * Analyze a configure request. Return true if it was agreeable, and 4051 * caused action sca, false if it has been rejected or nak'ed, and 4052 * caused action scn. (The return value is used to make the state 4053 * transition decision in the state automaton.) 4054 */ 4055 static enum cp_rcr_type 4056 sppp_ipv6cp_confreq(struct sppp *sp, struct lcp_header *h, int origlen, 4057 uint8_t **msgbuf, size_t *buflen, size_t *msglen) 4058 { 4059 u_char *buf, *r, *p, l, blen; 4060 int rlen, len; 4061 struct in6_addr myaddr, desiredaddr, suggestaddr; 4062 enum cp_rcr_type type; 4063 int ifidcount; 4064 int collision, nohisaddr; 4065 char ip6buf[INET6_ADDRSTRLEN]; 4066 char tbuf[SPPP_CPTYPE_NAMELEN]; 4067 char ipv6buf[SPPP_IPV6CPOPT_NAMELEN]; 4068 const char *cpname; 4069 bool debug; 4070 4071 KASSERT(SPPP_WLOCKED(sp)); 4072 4073 debug = sppp_debug_enabled(sp); 4074 type = CP_RCR_NONE; 4075 origlen -= sizeof(*h); 4076 4077 if (origlen < 0) 4078 return CP_RCR_DROP; 4079 4080 /* 4081 * Make sure to allocate a buf that can at least hold a 4082 * conf-nak with an `address' option. We might need it below. 4083 */ 4084 blen = MAX(6, origlen); 4085 4086 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 4087 if (buf == NULL) 4088 return CP_RCR_DROP; 4089 4090 /* pass 1: see if we can recognize them */ 4091 if (debug) 4092 SPPP_LOG(sp, LOG_DEBUG, "ipv6cp parse opts:"); 4093 p = (void *)(h + 1); 4094 r = buf; 4095 rlen = 0; 4096 ifidcount = 0; 4097 for (len = origlen; len > 1; len -= l, p += l) { 4098 l = p[1]; 4099 if (l == 0) 4100 break; 4101 4102 /* Sanity check option length */ 4103 if (l > len) { 4104 /* XXX just RXJ? */ 4105 if (debug) 4106 addlog("\n"); 4107 SPPP_LOG(sp, LOG_DEBUG, 4108 "received malicious IPCPv6 option, " 4109 "dropping\n"); 4110 type = CP_RCR_ERR; 4111 goto end; 4112 } 4113 if (debug) { 4114 addlog(" %s", sppp_ipv6cp_opt_name(ipv6buf, 4115 sizeof(ipv6buf),*p)); 4116 } 4117 switch (p[0]) { 4118 case IPV6CP_OPT_IFID: 4119 if (len >= 10 && l == 10 && ifidcount == 0) { 4120 /* correctly formed address option */ 4121 ifidcount++; 4122 continue; 4123 } 4124 if (debug) 4125 addlog(" [invalid]"); 4126 break; 4127 #ifdef notyet 4128 case IPV6CP_OPT_COMPRESSION: 4129 if (len >= 4 && l >= 4) { 4130 /* correctly formed compress option */ 4131 continue; 4132 } 4133 if (debug) 4134 addlog(" [invalid]"); 4135 break; 4136 #endif 4137 default: 4138 /* Others not supported. */ 4139 if (debug) 4140 addlog(" [rej]"); 4141 break; 4142 } 4143 if (rlen + l > blen) { 4144 if (debug) 4145 addlog(" [overflow]"); 4146 continue; 4147 } 4148 /* Add the option to rejected list. */ 4149 memcpy(r, p, l); 4150 r += l; 4151 rlen += l; 4152 } 4153 4154 if (rlen > 0) { 4155 type = CP_RCR_REJ; 4156 goto end; 4157 } 4158 4159 if (debug) 4160 addlog("\n"); 4161 4162 /* pass 2: parse option values */ 4163 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4164 if (debug) 4165 SPPP_LOG(sp, LOG_DEBUG, "ipv6cp parse opt values:"); 4166 p = (void *)(h + 1); 4167 r = buf; 4168 rlen = 0; 4169 type = CP_RCR_ACK; 4170 for (len = origlen; len > 1; len -= l, p += l) { 4171 l = p[1]; 4172 if (l == 0) 4173 break; 4174 4175 if (debug) { 4176 addlog(" %s", sppp_ipv6cp_opt_name(ipv6buf, 4177 sizeof(ipv6buf), *p)); 4178 } 4179 switch (p[0]) { 4180 #ifdef notyet 4181 case IPV6CP_OPT_COMPRESSION: 4182 continue; 4183 #endif 4184 case IPV6CP_OPT_IFID: 4185 memset(&desiredaddr, 0, sizeof(desiredaddr)); 4186 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 4187 collision = (memcmp(&desiredaddr.s6_addr[8], 4188 &myaddr.s6_addr[8], 8) == 0); 4189 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 4190 4191 desiredaddr.s6_addr16[0] = htons(0xfe80); 4192 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 4193 4194 if (!collision && !nohisaddr) { 4195 /* no collision, hisaddr known - Conf-Ack */ 4196 type = CP_RCR_ACK; 4197 memcpy(sp->ipv6cp.my_ifid, &myaddr.s6_addr[8], 4198 sizeof(sp->ipv6cp.my_ifid)); 4199 memcpy(sp->ipv6cp.his_ifid, 4200 &desiredaddr.s6_addr[8], 4201 sizeof(sp->ipv6cp.my_ifid)); 4202 4203 if (debug) { 4204 cpname = sppp_cp_type_name(tbuf, 4205 sizeof(tbuf), CONF_ACK); 4206 addlog(" %s [%s]", 4207 IN6_PRINT(ip6buf, &desiredaddr), 4208 cpname); 4209 } 4210 continue; 4211 } 4212 4213 memset(&suggestaddr, 0, sizeof(suggestaddr)); 4214 if (collision && nohisaddr) { 4215 /* collision, hisaddr unknown - Conf-Rej */ 4216 type = CP_RCR_REJ; 4217 memset(&p[2], 0, 8); 4218 } else { 4219 /* 4220 * - no collision, hisaddr unknown, or 4221 * - collision, hisaddr known 4222 * Conf-Nak, suggest hisaddr 4223 */ 4224 type = CP_RCR_NAK; 4225 sppp_suggest_ip6_addr(sp, &suggestaddr); 4226 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 4227 } 4228 if (debug) { 4229 int ctype = type == CP_RCR_REJ ? CONF_REJ : CONF_NAK; 4230 4231 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), ctype); 4232 addlog(" %s [%s]", IN6_PRINT(ip6buf, &desiredaddr), 4233 cpname); 4234 } 4235 break; 4236 } 4237 if (rlen + l > blen) { 4238 if (debug) 4239 addlog(" [overflow]"); 4240 continue; 4241 } 4242 /* Add the option to nak'ed list. */ 4243 memcpy(r, p, l); 4244 r += l; 4245 rlen += l; 4246 } 4247 4248 if (rlen > 0) { 4249 if (type != CP_RCR_ACK) { 4250 if (debug) { 4251 int ctype ; 4252 ctype = type == CP_RCR_REJ ? 4253 CONF_REJ : CONF_NAK; 4254 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), ctype); 4255 addlog(" send %s suggest %s\n", 4256 cpname, IN6_PRINT(ip6buf, &suggestaddr)); 4257 } 4258 } 4259 #ifdef notdef 4260 if (type == CP_RCR_ACK) 4261 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 4262 #endif 4263 } else { 4264 if (type == CP_RCR_ACK) { 4265 rlen = origlen; 4266 memcpy(r, h + 1, rlen); 4267 } 4268 } 4269 end: 4270 if (debug) 4271 addlog("\n"); 4272 4273 if (type == CP_RCR_ERR || type == CP_RCR_DROP) { 4274 if (buf != NULL) 4275 kmem_intr_free(buf, blen); 4276 } else { 4277 *msgbuf = buf; 4278 *buflen = blen; 4279 *msglen = rlen; 4280 } 4281 4282 return type; 4283 } 4284 4285 /* 4286 * Analyze the IPv6CP Configure-Reject option list, and adjust our 4287 * negotiation. 4288 */ 4289 static void 4290 sppp_ipv6cp_confrej(struct sppp *sp, struct lcp_header *h, int len) 4291 { 4292 u_char *p, l; 4293 bool debug; 4294 4295 KASSERT(SPPP_WLOCKED(sp)); 4296 4297 if (len <= sizeof(*h)) 4298 return; 4299 4300 len -= sizeof(*h); 4301 debug = sppp_debug_enabled(sp); 4302 4303 if (debug) 4304 SPPP_LOG(sp, LOG_DEBUG, "ipv6cp rej opts:"); 4305 4306 p = (void *)(h + 1); 4307 for (; len > 1; len -= l, p += l) { 4308 l = p[1]; 4309 if (l == 0) 4310 break; 4311 4312 if (l > len) { 4313 /* XXX just RXJ? */ 4314 if (debug) 4315 addlog("\n"); 4316 SPPP_LOG(sp, LOG_DEBUG, 4317 "received malicious IPCPv6 option, " 4318 "dropping\n"); 4319 goto end; 4320 } 4321 if (debug) { 4322 char ipv6buf[SPPP_IPV6CPOPT_NAMELEN]; 4323 addlog(" %s", sppp_ipv6cp_opt_name(ipv6buf, 4324 sizeof(ipv6buf), *p)); 4325 } 4326 switch (p[0]) { 4327 case IPV6CP_OPT_IFID: 4328 /* 4329 * Peer doesn't grok address option. This is 4330 * bad. XXX Should we better give up here? 4331 */ 4332 CLR(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_IFID); 4333 break; 4334 #ifdef notyet 4335 case IPV6CP_OPT_COMPRESS: 4336 CLR(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_COMPRESS); 4337 break; 4338 #endif 4339 } 4340 } 4341 if (debug) 4342 addlog("\n"); 4343 end: 4344 return; 4345 } 4346 4347 /* 4348 * Analyze the IPv6CP Configure-NAK option list, and adjust our 4349 * negotiation. 4350 */ 4351 static void 4352 sppp_ipv6cp_confnak(struct sppp *sp, struct lcp_header *h, int len) 4353 { 4354 u_char *p, l; 4355 struct in6_addr suggestaddr; 4356 char ip6buf[INET6_ADDRSTRLEN]; 4357 bool debug; 4358 4359 KASSERT(SPPP_WLOCKED(sp)); 4360 4361 if (len <= sizeof(*h)) 4362 return; 4363 4364 len -= sizeof(*h); 4365 debug = sppp_debug_enabled(sp); 4366 4367 if (debug) 4368 SPPP_LOG(sp, LOG_DEBUG, "ipv6cp nak opts:"); 4369 4370 p = (void *)(h + 1); 4371 for (; len > 1; len -= l, p += l) { 4372 l = p[1]; 4373 if (l == 0) 4374 break; 4375 4376 if (l > len) { 4377 /* XXX just RXJ? */ 4378 if (debug) 4379 addlog("\n"); 4380 SPPP_LOG(sp, LOG_DEBUG, 4381 "received malicious IPCPv6 option, " 4382 "dropping\n"); 4383 goto end; 4384 } 4385 if (debug) { 4386 char ipv6buf[SPPP_IPV6CPOPT_NAMELEN]; 4387 addlog(" %s", sppp_ipv6cp_opt_name(ipv6buf, 4388 sizeof(ipv6buf), *p)); 4389 } 4390 switch (p[0]) { 4391 case IPV6CP_OPT_IFID: 4392 /* 4393 * Peer doesn't like our local ifid. See 4394 * if we can do something for him. We'll drop 4395 * him our address then. 4396 */ 4397 if (len < 10 || l != 10) 4398 break; 4399 memset(&suggestaddr, 0, sizeof(suggestaddr)); 4400 suggestaddr.s6_addr16[0] = htons(0xfe80); 4401 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 4402 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 4403 4404 SET(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_IFID); 4405 if (debug) 4406 addlog(" [suggestaddr %s]", 4407 IN6_PRINT(ip6buf, &suggestaddr)); 4408 #ifdef IPV6CP_MYIFID_DYN 4409 /* 4410 * When doing dynamic address assignment, 4411 * we accept his offer. 4412 */ 4413 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 4414 struct in6_addr lastsuggest; 4415 /* 4416 * If <suggested myaddr from peer> equals to 4417 * <hisaddr we have suggested last time>, 4418 * we have a collision. generate new random 4419 * ifid. 4420 */ 4421 sppp_suggest_ip6_addr(&lastsuggest); 4422 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 4423 lastsuggest)) { 4424 if (debug) 4425 addlog(" [random]"); 4426 sppp_gen_ip6_addr(sp, &suggestaddr); 4427 } 4428 sppp_set_ip6_addr(sp, &suggestaddr, 0); 4429 if (debug) 4430 addlog(" [agree]"); 4431 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 4432 } 4433 #else 4434 /* 4435 * Since we do not do dynamic address assignment, 4436 * we ignore it and thus continue to negotiate 4437 * our already existing value. This can possibly 4438 * go into infinite request-reject loop. 4439 * 4440 * This is not likely because we normally use 4441 * ifid based on MAC-address. 4442 * If you have no ethernet card on the node, too bad. 4443 * XXX should we use fail_counter? 4444 */ 4445 #endif 4446 break; 4447 #ifdef notyet 4448 case IPV6CP_OPT_COMPRESS: 4449 /* 4450 * Peer wants different compression parameters. 4451 */ 4452 break; 4453 #endif 4454 } 4455 } 4456 if (debug) 4457 addlog("\n"); 4458 end: 4459 return; 4460 } 4461 4462 static void 4463 sppp_ipv6cp_tlu(struct sppp *sp) 4464 { 4465 struct ifnet *ifp; 4466 4467 KASSERT(SPPP_WLOCKED(sp)); 4468 4469 SPPP_LOG(sp, LOG_INFO, "IPv6CP layer up\n"); 4470 ifp = &sp->pp_if; 4471 /* we are up - notify isdn daemon */ 4472 sppp_notify_con_wlocked(sp); 4473 rt_ifmsg(ifp); 4474 } 4475 4476 static void 4477 sppp_ipv6cp_tld(struct sppp *sp) 4478 { 4479 struct ifnet *ifp; 4480 4481 KASSERT(SPPP_WLOCKED(sp)); 4482 4483 SPPP_LOG(sp, LOG_INFO, "IPv6CP layer down\n"); 4484 ifp = &sp->pp_if; 4485 rt_ifmsg(ifp); 4486 } 4487 4488 static void 4489 sppp_ipv6cp_scr(struct sppp *sp) 4490 { 4491 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 4492 struct in6_addr ouraddr; 4493 int i = 0; 4494 4495 KASSERT(SPPP_WLOCKED(sp)); 4496 4497 if (ISSET(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_IFID)) { 4498 kpreempt_disable(); 4499 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 4500 kpreempt_enable(); 4501 4502 opt[i++] = IPV6CP_OPT_IFID; 4503 opt[i++] = 10; 4504 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 4505 i += 8; 4506 } 4507 4508 #ifdef notyet 4509 if (ISSET(sp->ipv6cp.opts, SPPP_IPV6CP_OPT_COMPRESSION)) { 4510 opt[i++] = IPV6CP_OPT_COMPRESSION; 4511 opt[i++] = 4; 4512 opt[i++] = 0; /* TBD */ 4513 opt[i++] = 0; /* TBD */ 4514 /* variable length data may follow */ 4515 } 4516 #endif 4517 4518 sp->scp[IDX_IPV6CP].confid = ++sp->scp[IDX_IPV6CP].seq; 4519 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->scp[IDX_IPV6CP].confid, i, &opt); 4520 } 4521 #else /*INET6*/ 4522 static void 4523 sppp_ipv6cp_init(struct sppp *sp) 4524 { 4525 4526 KASSERT(SPPP_WLOCKED(sp)); 4527 } 4528 4529 static void 4530 sppp_ipv6cp_open(struct sppp *sp, void *xcp) 4531 { 4532 4533 KASSERT(SPPP_WLOCKED(sp)); 4534 } 4535 4536 static enum cp_rcr_type 4537 sppp_ipv6cp_confreq(struct sppp *sp, struct lcp_header *h, 4538 int len, uint8_t **msgbuf, size_t *buflen, size_t *msglen) 4539 { 4540 4541 KASSERT(SPPP_WLOCKED(sp)); 4542 return 0; 4543 } 4544 4545 static void 4546 sppp_ipv6cp_confrej(struct sppp *sp, struct lcp_header *h, 4547 int len) 4548 { 4549 4550 KASSERT(SPPP_WLOCKED(sp)); 4551 } 4552 4553 static void 4554 sppp_ipv6cp_confnak(struct sppp *sp, struct lcp_header *h, 4555 int len) 4556 { 4557 4558 KASSERT(SPPP_WLOCKED(sp)); 4559 } 4560 4561 static void 4562 sppp_ipv6cp_tlu(struct sppp *sp) 4563 { 4564 4565 KASSERT(SPPP_WLOCKED(sp)); 4566 } 4567 4568 static void 4569 sppp_ipv6cp_scr(struct sppp *sp) 4570 { 4571 4572 KASSERT(SPPP_WLOCKED(sp)); 4573 } 4574 #endif /*INET6*/ 4575 4576 /* 4577 *--------------------------------------------------------------------------* 4578 * * 4579 * The CHAP implementation. * 4580 * * 4581 *--------------------------------------------------------------------------* 4582 */ 4583 /* 4584 * The authentication protocols is implemented on the state machine for 4585 * control protocols. And it uses following actions and events. 4586 * 4587 * Actions: 4588 * - scr: send CHAP_CHALLENGE and CHAP_RESPONSE 4589 * - sca: send CHAP_SUCCESS 4590 * - scn: send CHAP_FAILURE and shutdown lcp 4591 * Events: 4592 * - RCR+: receive CHAP_RESPONSE containing correct digest 4593 * - RCR-: receive CHAP_RESPONSE containing wrong digest 4594 * - RCA: receive CHAP_SUCCESS 4595 * - RCN: (this event is unused) 4596 * - TO+: re-send CHAP_CHALLENGE and CHAP_RESPONSE 4597 * - TO-: this layer finish 4598 */ 4599 4600 /* 4601 * Handle incoming CHAP packets. 4602 */ 4603 void 4604 sppp_chap_input(struct sppp *sp, struct mbuf *m) 4605 { 4606 struct ifnet *ifp; 4607 struct lcp_header *h; 4608 int len, x; 4609 u_char *value, *name, digest[sizeof(sp->chap.challenge)]; 4610 int value_len, name_len; 4611 MD5_CTX ctx; 4612 char abuf[SPPP_AUTHTYPE_NAMELEN]; 4613 const char *authname; 4614 bool debug; 4615 4616 ifp = &sp->pp_if; 4617 debug = sppp_debug_enabled(sp); 4618 len = m->m_pkthdr.len; 4619 if (len < 4) { 4620 SPPP_DLOG(sp, "chap invalid packet length: " 4621 "%d bytes\n", len); 4622 return; 4623 } 4624 h = mtod(m, struct lcp_header *); 4625 if (len > ntohs(h->len)) 4626 len = ntohs(h->len); 4627 4628 SPPP_LOCK(sp, RW_WRITER); 4629 4630 switch (h->type) { 4631 /* challenge, failure and success are his authproto */ 4632 case CHAP_CHALLENGE: 4633 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4634 /* can't do anything useful */ 4635 sp->pp_auth_failures++; 4636 SPPP_DLOG(sp, "chap input " 4637 "without my name and my secret being set\n"); 4638 break; 4639 } 4640 value = 1 + (u_char *)(h + 1); 4641 value_len = value[-1]; 4642 name = value + value_len; 4643 name_len = len - value_len - 5; 4644 if (name_len < 0) { 4645 if (debug) { 4646 authname = sppp_auth_type_name(abuf, 4647 sizeof(abuf), PPP_CHAP, h->type); 4648 SPPP_LOG(sp, LOG_DEBUG, 4649 "chap corrupted challenge " 4650 "<%s id=0x%x len=%d", 4651 authname, h->ident, ntohs(h->len)); 4652 if (len > 4) 4653 sppp_print_bytes((u_char *)(h + 1), 4654 len - 4); 4655 addlog(">\n"); 4656 } 4657 break; 4658 } 4659 4660 if (debug) { 4661 authname = sppp_auth_type_name(abuf, 4662 sizeof(abuf), PPP_CHAP, h->type); 4663 SPPP_LOG(sp, LOG_DEBUG, 4664 "chap input <%s id=0x%x len=%d name=", 4665 authname, h->ident, ntohs(h->len)); 4666 sppp_print_string((char *) name, name_len); 4667 addlog(" value-size=%d value=", value_len); 4668 sppp_print_bytes(value, value_len); 4669 addlog(">\n"); 4670 } 4671 4672 /* Compute reply value. */ 4673 MD5Init(&ctx); 4674 MD5Update(&ctx, &h->ident, 1); 4675 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 4676 MD5Update(&ctx, value, value_len); 4677 MD5Final(sp->chap.digest, &ctx); 4678 sp->chap.digest_len = sizeof(sp->chap.digest); 4679 sp->scp[IDX_CHAP].rconfid = h->ident; 4680 4681 sppp_wq_add(sp->wq_cp, &sp->chap.work_challenge_rcvd); 4682 break; 4683 4684 case CHAP_SUCCESS: 4685 if (debug) { 4686 SPPP_LOG(sp, LOG_DEBUG, "chap success"); 4687 if (len > 4) { 4688 addlog(": "); 4689 sppp_print_string((char *)(h + 1), len - 4); 4690 } 4691 addlog("\n"); 4692 } 4693 4694 if (h->ident != sp->scp[IDX_CHAP].rconfid) { 4695 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 4696 chap.name, h->ident, 4697 sp->scp[IDX_CHAP].rconfid); 4698 if_statinc(ifp, if_ierrors); 4699 break; 4700 } 4701 4702 if (sp->chap.digest_len == 0) { 4703 SPPP_DLOG(sp, "receive CHAP success" 4704 " without challenge\n"); 4705 if_statinc(ifp, if_ierrors); 4706 break; 4707 } 4708 4709 x = splnet(); 4710 sp->pp_auth_failures = 0; 4711 sp->pp_flags &= ~PP_NEEDAUTH; 4712 splx(x); 4713 memset(sp->chap.digest, 0, sizeof(sp->chap.digest)); 4714 sp->chap.digest_len = 0; 4715 4716 if (!ISSET(sppp_auth_role(&chap, sp), SPPP_AUTH_SERV)) { 4717 /* 4718 * we are not authenticator for CHAP, 4719 * generate a dummy RCR+ event without CHAP_RESPONSE 4720 */ 4721 sp->scp[IDX_CHAP].rcr_type = CP_RCR_ACK; 4722 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_rcr); 4723 } 4724 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_rca); 4725 break; 4726 4727 case CHAP_FAILURE: 4728 if (h->ident != sp->scp[IDX_CHAP].rconfid) { 4729 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 4730 chap.name, h->ident, sp->scp[IDX_CHAP].rconfid); 4731 if_statinc(ifp, if_ierrors); 4732 break; 4733 } 4734 4735 if (sp->chap.digest_len == 0) { 4736 SPPP_DLOG(sp, "receive CHAP failure " 4737 "without challenge\n"); 4738 if_statinc(ifp, if_ierrors); 4739 break; 4740 } 4741 4742 x = splnet(); 4743 sp->pp_auth_failures++; 4744 splx(x); 4745 SPPP_LOG(sp, LOG_INFO, "chap failure"); 4746 if (debug) { 4747 if (len > 4) { 4748 addlog(": "); 4749 sppp_print_string((char *)(h + 1), len - 4); 4750 } 4751 } 4752 addlog("\n"); 4753 4754 memset(sp->chap.digest, 0, sizeof(sp->chap.digest)); 4755 sp->chap.digest_len = 0; 4756 /* 4757 * await LCP shutdown by authenticator, 4758 * so we don't have to enqueue sc->scp[IDX_CHAP].work_rcn 4759 */ 4760 break; 4761 4762 /* response is my authproto */ 4763 case CHAP_RESPONSE: 4764 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4765 /* can't do anything useful */ 4766 SPPP_DLOG(sp, "chap response " 4767 "without his name and his secret being set\n"); 4768 break; 4769 } 4770 value = 1 + (u_char *)(h + 1); 4771 value_len = value[-1]; 4772 name = value + value_len; 4773 name_len = len - value_len - 5; 4774 if (name_len < 0) { 4775 if (debug) { 4776 authname = sppp_auth_type_name(abuf, 4777 sizeof(abuf), PPP_CHAP, h->type); 4778 SPPP_LOG(sp, LOG_DEBUG, 4779 "chap corrupted response " 4780 "<%s id=0x%x len=%d", 4781 authname, h->ident, ntohs(h->len)); 4782 if (len > 4) 4783 sppp_print_bytes((u_char *)(h + 1), 4784 len - 4); 4785 addlog(">\n"); 4786 } 4787 break; 4788 } 4789 if (h->ident != sp->scp[IDX_CHAP].confid) { 4790 SPPP_DLOG(sp, "chap dropping response for old ID " 4791 "(got %d, expected %d)\n", 4792 h->ident, sp->scp[IDX_CHAP].confid); 4793 break; 4794 } else { 4795 sp->scp[IDX_CHAP].rconfid = h->ident; 4796 } 4797 4798 if (sp->hisauth.name != NULL && 4799 (name_len != sp->hisauth.name_len 4800 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4801 SPPP_LOG(sp, LOG_INFO, 4802 "chap response, his name "); 4803 sppp_print_string(name, name_len); 4804 addlog(" != expected "); 4805 sppp_print_string(sp->hisauth.name, 4806 sp->hisauth.name_len); 4807 addlog("\n"); 4808 4809 /* generate RCR- event */ 4810 sp->scp[IDX_CHAP].rcr_type = CP_RCR_NAK; 4811 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_rcr); 4812 break; 4813 } 4814 4815 if (debug) { 4816 authname = sppp_auth_type_name(abuf, 4817 sizeof(abuf), PPP_CHAP, h->type); 4818 SPPP_LOG(sp, LOG_DEBUG, "chap input(%s) " 4819 "<%s id=0x%x len=%d name=", 4820 sppp_state_name(sp->scp[IDX_CHAP].state), 4821 authname, h->ident, ntohs(h->len)); 4822 sppp_print_string((char *)name, name_len); 4823 addlog(" value-size=%d value=", value_len); 4824 sppp_print_bytes(value, value_len); 4825 addlog(">\n"); 4826 } 4827 4828 if (value_len == sizeof(sp->chap.challenge) && 4829 value_len == sizeof(sp->chap.digest)) { 4830 MD5Init(&ctx); 4831 MD5Update(&ctx, &h->ident, 1); 4832 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4833 MD5Update(&ctx, sp->chap.challenge, sizeof(sp->chap.challenge)); 4834 MD5Final(digest, &ctx); 4835 4836 if (memcmp(digest, value, value_len) == 0) { 4837 sp->scp[IDX_CHAP].rcr_type = CP_RCR_ACK; 4838 } else { 4839 sp->scp[IDX_CHAP].rcr_type = CP_RCR_NAK; 4840 } 4841 } else { 4842 if (debug) { 4843 SPPP_LOG(sp, LOG_DEBUG, 4844 "chap bad hash value length: " 4845 "%d bytes, should be %zu\n", 4846 value_len, sizeof(sp->chap.challenge)); 4847 } 4848 4849 sp->scp[IDX_CHAP].rcr_type = CP_RCR_NAK; 4850 } 4851 4852 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_rcr); 4853 4854 /* generate a dummy RCA event */ 4855 if (sp->scp[IDX_CHAP].rcr_type == CP_RCR_ACK && 4856 (!ISSET(sppp_auth_role(&chap, sp), SPPP_AUTH_PEER) || 4857 sp->chap.rechallenging)) { 4858 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_CHAP].work_rca); 4859 } 4860 break; 4861 4862 default: 4863 /* Unknown CHAP packet type -- ignore. */ 4864 if (debug) { 4865 SPPP_LOG(sp, LOG_DEBUG, "chap unknown input(%s) " 4866 "<0x%x id=0x%xh len=%d", 4867 sppp_state_name(sp->scp[IDX_CHAP].state), 4868 h->type, h->ident, ntohs(h->len)); 4869 if (len > 4) 4870 sppp_print_bytes((u_char *)(h + 1), len - 4); 4871 addlog(">\n"); 4872 } 4873 break; 4874 4875 } 4876 4877 SPPP_UNLOCK(sp); 4878 } 4879 4880 static void 4881 sppp_chap_init(struct sppp *sp) 4882 { 4883 4884 KASSERT(SPPP_WLOCKED(sp)); 4885 4886 sppp_cp_init(&chap, sp); 4887 4888 SPPP_WQ_SET(&sp->chap.work_challenge_rcvd, 4889 sppp_chap_rcv_challenge_event, &chap); 4890 } 4891 4892 static void 4893 sppp_chap_open(struct sppp *sp, void *xcp) 4894 { 4895 4896 KASSERT(SPPP_WLOCKED(sp)); 4897 4898 memset(sp->chap.digest, 0, sizeof(sp->chap.digest)); 4899 sp->chap.digest_len = 0; 4900 sp->chap.rechallenging = false; 4901 sp->chap.response_rcvd = false; 4902 sppp_open_event(sp, xcp); 4903 } 4904 4905 static void 4906 sppp_chap_tlu(struct sppp *sp) 4907 { 4908 int i, x; 4909 4910 KASSERT(SPPP_WLOCKED(sp)); 4911 4912 i = 0; 4913 sp->scp[IDX_CHAP].rst_counter = sp->lcp.max_configure; 4914 x = splnet(); 4915 sp->pp_auth_failures = 0; 4916 splx(x); 4917 4918 SPPP_LOG(sp, LOG_DEBUG, "chap %s", 4919 sp->pp_phase == SPPP_PHASE_NETWORK ? "reconfirmed" : "tlu"); 4920 4921 /* 4922 * Some broken CHAP implementations (Conware CoNet, firmware 4923 * 4.0.?) don't want to re-authenticate their CHAP once the 4924 * initial challenge-response exchange has taken place. 4925 * Provide for an option to avoid rechallenges. 4926 */ 4927 if (ISSET(sppp_auth_role(&chap, sp), SPPP_AUTH_SERV) && 4928 (sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4929 /* 4930 * Compute the re-challenge timeout. This will yield 4931 * a number between 300 and 810 seconds. 4932 */ 4933 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4934 callout_schedule(&sp->scp[IDX_CHAP].ch, i * hz); 4935 4936 if (sppp_debug_enabled(sp)) { 4937 addlog(", next rechallenge in %d seconds", i); 4938 } 4939 } 4940 4941 addlog("\n"); 4942 4943 /* 4944 * If we are already in phase network, we are done here. This 4945 * is the case if this is a dummy tlu event after a re-challenge. 4946 */ 4947 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4948 sppp_phase_network(sp); 4949 } 4950 4951 static void 4952 sppp_chap_scr(struct sppp *sp) 4953 { 4954 uint32_t *ch; 4955 u_char clen, dsize; 4956 int role; 4957 4958 KASSERT(SPPP_WLOCKED(sp)); 4959 4960 role = sppp_auth_role(&chap, sp); 4961 4962 if (ISSET(role, SPPP_AUTH_SERV) && 4963 !sp->chap.response_rcvd) { 4964 /* we are authenticator for CHAP, send challenge */ 4965 ch = (uint32_t *)sp->chap.challenge; 4966 clen = sizeof(sp->chap.challenge); 4967 /* Compute random challenge. */ 4968 cprng_strong(kern_cprng, ch, clen, 0); 4969 4970 sp->scp[IDX_CHAP].confid = ++sp->scp[IDX_CHAP].seq; 4971 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->scp[IDX_CHAP].confid, 4972 sizeof(clen), (const char *)&clen, 4973 sizeof(sp->chap.challenge), sp->chap.challenge, 4974 0); 4975 } 4976 4977 if (ISSET(role, SPPP_AUTH_PEER) && 4978 sp->chap.digest_len > 0) { 4979 /* we are peer for CHAP, send response */ 4980 dsize = sp->chap.digest_len; 4981 4982 sppp_auth_send(&chap, sp, CHAP_RESPONSE, sp->scp[IDX_CHAP].rconfid, 4983 sizeof(dsize), (const char *)&dsize, 4984 sp->chap.digest_len, sp->chap.digest, 4985 sp->myauth.name_len, sp->myauth.name, 0); 4986 } 4987 } 4988 4989 static void 4990 sppp_chap_rcv_challenge_event(struct sppp *sp, void *xcp) 4991 { 4992 const struct cp *cp = xcp; 4993 4994 KASSERT(!cpu_softintr_p()); 4995 4996 sp->chap.rechallenging = false; 4997 4998 switch (sp->scp[IDX_CHAP].state) { 4999 case STATE_REQ_SENT: 5000 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 5001 cp->scr(sp); 5002 break; 5003 case STATE_OPENED: 5004 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 5005 cp->scr(sp); 5006 break; 5007 } 5008 } 5009 5010 /* 5011 *--------------------------------------------------------------------------* 5012 * * 5013 * The PAP implementation. * 5014 * * 5015 *--------------------------------------------------------------------------* 5016 */ 5017 /* 5018 * PAP uses following actions and events. 5019 * Actions: 5020 * - scr: send PAP_REQ 5021 * - sca: send PAP_ACK 5022 * - scn: send PAP_NAK 5023 * Events: 5024 * - RCR+: receive PAP_REQ containing correct username and password 5025 * - RCR-: receive PAP_REQ containing wrong username and password 5026 * - RCA: receive PAP_ACK 5027 * - RCN: (this event is unused) 5028 * - TO+: re-send PAP_REQ 5029 * - TO-: this layer finish 5030 */ 5031 5032 /* 5033 * Handle incoming PAP packets. */ 5034 static void 5035 sppp_pap_input(struct sppp *sp, struct mbuf *m) 5036 { 5037 struct ifnet *ifp; 5038 struct lcp_header *h; 5039 int len, x; 5040 char *name, *secret; 5041 int name_len, secret_len; 5042 char abuf[SPPP_AUTHTYPE_NAMELEN]; 5043 const char *authname; 5044 bool debug; 5045 5046 ifp = &sp->pp_if; 5047 debug = sppp_debug_enabled(sp); 5048 5049 /* 5050 * Malicious input might leave this uninitialized, so 5051 * init to an impossible value. 5052 */ 5053 secret_len = -1; 5054 5055 len = m->m_pkthdr.len; 5056 if (len < 5) { 5057 SPPP_DLOG(sp, "pap invalid packet length: " 5058 "%d bytes\n", len); 5059 return; 5060 } 5061 h = mtod(m, struct lcp_header *); 5062 if (len > ntohs(h->len)) 5063 len = ntohs(h->len); 5064 5065 SPPP_LOCK(sp, RW_WRITER); 5066 5067 switch (h->type) { 5068 /* PAP request is my authproto */ 5069 case PAP_REQ: 5070 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 5071 /* can't do anything useful */ 5072 SPPP_DLOG(sp, "pap request" 5073 " without his name and his secret being set\n"); 5074 break; 5075 } 5076 name = 1 + (u_char *)(h + 1); 5077 name_len = name[-1]; 5078 secret = name + name_len + 1; 5079 if (name_len > len - 6 || 5080 (secret_len = secret[-1]) > len - 6 - name_len) { 5081 if (debug) { 5082 authname = sppp_auth_type_name(abuf, 5083 sizeof(abuf), PPP_PAP, h->type); 5084 SPPP_LOG(sp, LOG_DEBUG, "pap corrupted input " 5085 "<%s id=0x%x len=%d", 5086 authname, h->ident, ntohs(h->len)); 5087 if (len > 4) 5088 sppp_print_bytes((u_char *)(h + 1), 5089 len - 4); 5090 addlog(">\n"); 5091 } 5092 break; 5093 } 5094 if (debug) { 5095 authname = sppp_auth_type_name(abuf, 5096 sizeof(abuf), PPP_PAP, h->type); 5097 SPPP_LOG(sp, LOG_DEBUG, "pap input(%s) " 5098 "<%s id=0x%x len=%d name=", 5099 sppp_state_name(sp->scp[IDX_PAP].state), 5100 authname, h->ident, ntohs(h->len)); 5101 sppp_print_string((char *)name, name_len); 5102 addlog(" secret="); 5103 sppp_print_string((char *)secret, secret_len); 5104 addlog(">\n"); 5105 } 5106 5107 sp->scp[IDX_PAP].rconfid = h->ident; 5108 5109 if (name_len == sp->hisauth.name_len && 5110 memcmp(name, sp->hisauth.name, name_len) == 0 && 5111 secret_len == sp->hisauth.secret_len && 5112 memcmp(secret, sp->hisauth.secret, secret_len) == 0) { 5113 sp->scp[IDX_PAP].rcr_type = CP_RCR_ACK; 5114 } else { 5115 sp->scp[IDX_PAP].rcr_type = CP_RCR_NAK; 5116 } 5117 5118 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_PAP].work_rcr); 5119 5120 /* generate a dummy RCA event */ 5121 if (sp->scp[IDX_PAP].rcr_type == CP_RCR_ACK && 5122 !ISSET(sppp_auth_role(&pap, sp), SPPP_AUTH_PEER)) { 5123 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_PAP].work_rca); 5124 } 5125 break; 5126 5127 /* ack and nak are his authproto */ 5128 case PAP_ACK: 5129 if (debug) { 5130 SPPP_LOG(sp, LOG_DEBUG, "pap success"); 5131 name = 1 + (u_char *)(h + 1); 5132 name_len = name[-1]; 5133 if (len > 5 && name_len < len+4) { 5134 addlog(": "); 5135 sppp_print_string(name, name_len); 5136 } 5137 addlog("\n"); 5138 } 5139 5140 if (h->ident != sp->scp[IDX_PAP].confid) { 5141 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 5142 pap.name, h->ident, sp->scp[IDX_PAP].rconfid); 5143 if_statinc(ifp, if_ierrors); 5144 break; 5145 } 5146 5147 x = splnet(); 5148 sp->pp_auth_failures = 0; 5149 sp->pp_flags &= ~PP_NEEDAUTH; 5150 splx(x); 5151 5152 /* we are not authenticator, generate a dummy RCR+ event */ 5153 if (!ISSET(sppp_auth_role(&pap, sp), SPPP_AUTH_SERV)) { 5154 sp->scp[IDX_PAP].rcr_type = CP_RCR_ACK; 5155 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_PAP].work_rcr); 5156 } 5157 5158 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_PAP].work_rca); 5159 break; 5160 5161 case PAP_NAK: 5162 if (debug) { 5163 SPPP_LOG(sp, LOG_INFO, "pap failure"); 5164 name = 1 + (u_char *)(h + 1); 5165 name_len = name[-1]; 5166 if (len > 5 && name_len < len+4) { 5167 addlog(": "); 5168 sppp_print_string(name, name_len); 5169 } 5170 addlog("\n"); 5171 } else { 5172 SPPP_LOG(sp, LOG_INFO, "pap failure\n"); 5173 } 5174 5175 if (h->ident != sp->scp[IDX_PAP].confid) { 5176 SPPP_DLOG(sp, "%s id mismatch 0x%x != 0x%x\n", 5177 pap.name, h->ident, sp->scp[IDX_PAP].rconfid); 5178 if_statinc(ifp, if_ierrors); 5179 break; 5180 } 5181 5182 sp->pp_auth_failures++; 5183 /* 5184 * await LCP shutdown by authenticator, 5185 * so we don't have to enqueue sc->scp[IDX_PAP].work_rcn 5186 */ 5187 break; 5188 5189 default: 5190 /* Unknown PAP packet type -- ignore. */ 5191 if (debug) { 5192 SPPP_LOG(sp, LOG_DEBUG, "pap corrupted input " 5193 "<0x%x id=0x%x len=%d", 5194 h->type, h->ident, ntohs(h->len)); 5195 if (len > 4) 5196 sppp_print_bytes((u_char *)(h + 1), len - 4); 5197 addlog(">\n"); 5198 } 5199 break; 5200 } 5201 5202 SPPP_UNLOCK(sp); 5203 } 5204 5205 static void 5206 sppp_pap_init(struct sppp *sp) 5207 { 5208 5209 KASSERT(SPPP_WLOCKED(sp)); 5210 sppp_cp_init(&pap, sp); 5211 } 5212 5213 static void 5214 sppp_pap_tlu(struct sppp *sp) 5215 { 5216 int x; 5217 5218 SPPP_DLOG(sp, "%s tlu\n", pap.name); 5219 5220 sp->scp[IDX_PAP].rst_counter = sp->lcp.max_configure; 5221 x = splnet(); 5222 sp->pp_auth_failures = 0; 5223 splx(x); 5224 5225 if (sp->pp_phase < SPPP_PHASE_NETWORK) 5226 sppp_phase_network(sp); 5227 } 5228 5229 static void 5230 sppp_pap_scr(struct sppp *sp) 5231 { 5232 u_char idlen, pwdlen; 5233 5234 KASSERT(SPPP_WLOCKED(sp)); 5235 5236 if (ISSET(sppp_auth_role(&pap, sp), SPPP_AUTH_PEER) && 5237 sp->scp[IDX_PAP].state != STATE_ACK_RCVD) { 5238 if (sp->myauth.secret == NULL || 5239 sp->myauth.name == NULL) { 5240 SPPP_LOG(sp, LOG_DEBUG, 5241 "couldn't send PAP_REQ " 5242 "because of no name or no secret\n"); 5243 } else { 5244 sp->scp[IDX_PAP].confid = ++sp->scp[IDX_PAP].seq; 5245 pwdlen = sp->myauth.secret_len; 5246 idlen = sp->myauth.name_len; 5247 5248 sppp_auth_send(&pap, sp, PAP_REQ, sp->scp[IDX_PAP].confid, 5249 sizeof idlen, (const char *)&idlen, 5250 idlen, sp->myauth.name, 5251 sizeof pwdlen, (const char *)&pwdlen, 5252 pwdlen, sp->myauth.secret, 5253 0); 5254 } 5255 } 5256 } 5257 5258 /* 5259 * Random miscellaneous functions. 5260 */ 5261 5262 /* 5263 * Send a PAP or CHAP proto packet. 5264 * 5265 * Varadic function, each of the elements for the ellipsis is of type 5266 * ``size_t mlen, const u_char *msg''. Processing will stop iff 5267 * mlen == 0. 5268 * NOTE: never declare variadic functions with types subject to type 5269 * promotion (i.e. u_char). This is asking for big trouble depending 5270 * on the architecture you are on... 5271 */ 5272 5273 static void 5274 sppp_auth_send(const struct cp *cp, struct sppp *sp, 5275 unsigned int type, unsigned int id, 5276 ...) 5277 { 5278 struct ifnet *ifp; 5279 struct lcp_header *lh; 5280 struct mbuf *m; 5281 u_char *p; 5282 int len; 5283 size_t pkthdrlen; 5284 unsigned int mlen; 5285 const char *msg; 5286 va_list ap; 5287 5288 KASSERT(SPPP_WLOCKED(sp)); 5289 5290 ifp = &sp->pp_if; 5291 5292 MGETHDR(m, M_DONTWAIT, MT_DATA); 5293 if (! m) 5294 return; 5295 m_reset_rcvif(m); 5296 5297 if (sp->pp_flags & PP_NOFRAMING) { 5298 *mtod(m, uint16_t *) = htons(cp->proto); 5299 pkthdrlen = 2; 5300 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 5301 } else { 5302 struct ppp_header *h; 5303 h = mtod(m, struct ppp_header *); 5304 h->address = PPP_ALLSTATIONS; /* broadcast address */ 5305 h->control = PPP_UI; /* Unnumbered Info */ 5306 h->protocol = htons(cp->proto); 5307 pkthdrlen = PPP_HEADER_LEN; 5308 5309 lh = (struct lcp_header *)(h + 1); 5310 } 5311 5312 lh->type = type; 5313 lh->ident = id; 5314 p = (u_char *)(lh + 1); 5315 5316 va_start(ap, id); 5317 len = 0; 5318 5319 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 5320 msg = va_arg(ap, const char *); 5321 len += mlen; 5322 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 5323 va_end(ap); 5324 m_freem(m); 5325 return; 5326 } 5327 5328 memcpy(p, msg, mlen); 5329 p += mlen; 5330 } 5331 va_end(ap); 5332 5333 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 5334 lh->len = htons(LCP_HEADER_LEN + len); 5335 5336 if (sppp_debug_enabled(sp)) { 5337 char abuf[SPPP_AUTHTYPE_NAMELEN]; 5338 const char *authname; 5339 5340 authname = sppp_auth_type_name(abuf, 5341 sizeof(abuf), cp->proto, lh->type); 5342 SPPP_LOG(sp, LOG_DEBUG, "%s output <%s id=0x%x len=%d", 5343 cp->name, authname, 5344 lh->ident, ntohs(lh->len)); 5345 if (len) 5346 sppp_print_bytes((u_char *)(lh + 1), len); 5347 addlog(">\n"); 5348 } 5349 if (IF_QFULL(&sp->pp_cpq)) { 5350 IF_DROP(&sp->pp_fastq); 5351 IF_DROP(&ifp->if_snd); 5352 m_freem(m); 5353 if_statinc(ifp, if_oerrors); 5354 return; 5355 } 5356 5357 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 5358 IF_ENQUEUE(&sp->pp_cpq, m); 5359 5360 if (! (ifp->if_flags & IFF_OACTIVE)) { 5361 SPPP_UNLOCK(sp); 5362 if_start_lock(ifp); 5363 SPPP_LOCK(sp, RW_WRITER); 5364 } 5365 } 5366 5367 static int 5368 sppp_auth_role(const struct cp *cp, struct sppp *sp) 5369 { 5370 int role; 5371 5372 role = SPPP_AUTH_NOROLE; 5373 5374 if (sp->hisauth.proto == cp->proto && 5375 ISSET(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO)) 5376 SET(role, SPPP_AUTH_SERV); 5377 5378 if (sp->myauth.proto == cp->proto) 5379 SET(role, SPPP_AUTH_PEER); 5380 5381 return role; 5382 } 5383 5384 static void 5385 sppp_auth_to_event(struct sppp *sp, void *xcp) 5386 { 5387 const struct cp *cp = xcp; 5388 bool override; 5389 int state; 5390 5391 KASSERT(SPPP_WLOCKED(sp)); 5392 KASSERT(!cpu_softintr_p()); 5393 5394 override = false; 5395 state = sp->scp[cp->protoidx].state; 5396 5397 if (sp->scp[cp->protoidx].rst_counter > 0) { 5398 /* override TO+ event */ 5399 switch (state) { 5400 case STATE_OPENED: 5401 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 5402 override = true; 5403 sp->chap.rechallenging = true; 5404 sp->chap.response_rcvd = false; 5405 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 5406 cp->scr(sp); 5407 } 5408 break; 5409 5410 case STATE_ACK_RCVD: 5411 override = true; 5412 cp->scr(sp); 5413 callout_schedule(&sp->scp[cp->protoidx].ch, sp->lcp.timeout); 5414 break; 5415 } 5416 } 5417 5418 if (override) { 5419 SPPP_DLOG(sp, "%s TO(%s) rst_counter = %d\n", 5420 cp->name, sppp_state_name(state), 5421 sp->scp[cp->protoidx].rst_counter); 5422 sp->scp[cp->protoidx].rst_counter--; 5423 } else { 5424 sppp_to_event(sp, xcp); 5425 } 5426 } 5427 5428 static void 5429 sppp_auth_screply(const struct cp *cp, struct sppp *sp, u_char ctype, 5430 uint8_t ident, size_t _mlen __unused, void *_msg __unused) 5431 { 5432 static const char *succmsg = "Welcome!"; 5433 static const char *failmsg = "Failed..."; 5434 const char *msg; 5435 u_char type, mlen; 5436 5437 KASSERT(SPPP_WLOCKED(sp)); 5438 5439 if (!ISSET(sppp_auth_role(cp, sp), SPPP_AUTH_SERV)) 5440 return; 5441 5442 if (ctype == CONF_ACK) { 5443 type = cp->proto == PPP_CHAP ? CHAP_SUCCESS : PAP_ACK; 5444 msg = succmsg; 5445 mlen = sizeof(succmsg) - 1; 5446 5447 sp->pp_auth_failures = 0; 5448 } else { 5449 type = cp->proto == PPP_CHAP ? CHAP_FAILURE : PAP_NAK; 5450 msg = failmsg; 5451 mlen = sizeof(failmsg) - 1; 5452 5453 /* shutdown LCP if auth failed */ 5454 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 5455 sp->pp_auth_failures++; 5456 } 5457 5458 sppp_auth_send(cp, sp, type, ident, mlen, (const u_char *)msg, 0); 5459 } 5460 5461 /* 5462 * Send keepalive packets, every 10 seconds. 5463 */ 5464 static void 5465 sppp_keepalive(void *dummy) 5466 { 5467 struct sppp *sp; 5468 int s; 5469 time_t now; 5470 5471 SPPPQ_LOCK(); 5472 5473 s = splnet(); 5474 now = time_uptime; 5475 for (sp=spppq; sp; sp=sp->pp_next) { 5476 struct ifnet *ifp = NULL; 5477 5478 SPPP_LOCK(sp, RW_WRITER); 5479 ifp = &sp->pp_if; 5480 5481 /* check idle timeout */ 5482 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 5483 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 5484 /* idle timeout is enabled for this interface */ 5485 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 5486 SPPP_DLOG(sp, "no activity for %lu seconds\n", 5487 (unsigned long)(now-sp->pp_last_activity)); 5488 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 5489 SPPP_UNLOCK(sp); 5490 continue; 5491 } 5492 } 5493 5494 /* Keepalive mode disabled or channel down? */ 5495 if (! (sp->pp_flags & PP_KEEPALIVE) || 5496 ! (ifp->if_flags & IFF_RUNNING)) { 5497 SPPP_UNLOCK(sp); 5498 continue; 5499 } 5500 5501 /* No keepalive in PPP mode if LCP not opened yet. */ 5502 if (sp->pp_phase < SPPP_PHASE_AUTHENTICATE) { 5503 SPPP_UNLOCK(sp); 5504 continue; 5505 } 5506 5507 /* No echo reply, but maybe user data passed through? */ 5508 if (sp->pp_max_noreceive != 0 && 5509 (now - sp->pp_last_receive) < sp->pp_max_noreceive) { 5510 sp->pp_alivecnt = 0; 5511 SPPP_UNLOCK(sp); 5512 continue; 5513 } 5514 5515 /* No echo request */ 5516 if (sp->pp_alive_interval == 0) { 5517 SPPP_UNLOCK(sp); 5518 continue; 5519 } 5520 5521 /* send a ECHO_REQ once in sp->pp_alive_interval times */ 5522 if ((sppp_keepalive_cnt % sp->pp_alive_interval) != 0) { 5523 SPPP_UNLOCK(sp); 5524 continue; 5525 } 5526 5527 if (sp->pp_alivecnt >= sp->pp_maxalive) { 5528 /* No keepalive packets got. Stop the interface. */ 5529 if (sp->pp_flags & PP_KEEPALIVE_IFDOWN) 5530 sppp_wq_add(sp->wq_cp, &sp->work_ifdown); 5531 5532 SPPP_LOG(sp, LOG_INFO,"LCP keepalive timed out, " 5533 "going to restart the connection\n"); 5534 sp->pp_alivecnt = 0; 5535 5536 /* we are down, close all open protocols */ 5537 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_close); 5538 5539 /* And now prepare LCP to reestablish the link, if configured to do so. */ 5540 sp->lcp.reestablish = true; 5541 5542 SPPP_UNLOCK(sp); 5543 continue; 5544 } 5545 if (sp->pp_alivecnt < sp->pp_maxalive) 5546 ++sp->pp_alivecnt; 5547 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 5548 int32_t nmagic = htonl(sp->lcp.magic); 5549 sp->lcp.echoid = ++sp->scp[IDX_LCP].seq; 5550 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 5551 sp->lcp.echoid, 4, &nmagic); 5552 } 5553 5554 SPPP_UNLOCK(sp); 5555 } 5556 splx(s); 5557 sppp_keepalive_cnt++; 5558 callout_reset(&keepalive_ch, hz * SPPP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 5559 5560 SPPPQ_UNLOCK(); 5561 } 5562 5563 #ifdef INET 5564 /* 5565 * Get both IP addresses. 5566 */ 5567 static void 5568 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 5569 { 5570 struct ifnet *ifp = &sp->pp_if; 5571 struct ifaddr *ifa; 5572 struct sockaddr_in *si, *sm; 5573 uint32_t ssrc, ddst; 5574 int s; 5575 struct psref psref; 5576 5577 sm = NULL; 5578 ssrc = ddst = 0; 5579 /* 5580 * Pick the first AF_INET address from the list, 5581 * aliases don't make any sense on a p2p link anyway. 5582 */ 5583 si = 0; 5584 s = pserialize_read_enter(); 5585 IFADDR_READER_FOREACH(ifa, ifp) { 5586 if (ifa->ifa_addr->sa_family == AF_INET) { 5587 si = (struct sockaddr_in *)ifa->ifa_addr; 5588 sm = (struct sockaddr_in *)ifa->ifa_netmask; 5589 if (si) { 5590 ifa_acquire(ifa, &psref); 5591 break; 5592 } 5593 } 5594 } 5595 pserialize_read_exit(s); 5596 if (ifa) { 5597 if (si && si->sin_addr.s_addr) { 5598 ssrc = si->sin_addr.s_addr; 5599 if (srcmask) 5600 *srcmask = ntohl(sm->sin_addr.s_addr); 5601 } 5602 5603 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 5604 if (si && si->sin_addr.s_addr) 5605 ddst = si->sin_addr.s_addr; 5606 ifa_release(ifa, &psref); 5607 } 5608 5609 if (dst) *dst = ntohl(ddst); 5610 if (src) *src = ntohl(ssrc); 5611 } 5612 5613 /* 5614 * Set IP addresses. Must be called at splnet. 5615 * If an address is 0, leave it the way it is. 5616 */ 5617 static void 5618 sppp_set_ip_addrs(struct sppp *sp) 5619 { 5620 struct ifnet *ifp; 5621 struct ifaddr *ifa; 5622 struct sockaddr_in *si, *dest; 5623 uint32_t myaddr = 0, hisaddr = 0; 5624 int s; 5625 5626 KASSERT(SPPP_WLOCKED(sp)); 5627 5628 ifp = &sp->pp_if; 5629 5630 SPPP_UNLOCK(sp); 5631 IFNET_LOCK(ifp); 5632 SPPP_LOCK(sp, RW_WRITER); 5633 5634 /* 5635 * Pick the first AF_INET address from the list, 5636 * aliases don't make any sense on a p2p link anyway. 5637 */ 5638 si = dest = NULL; 5639 s = pserialize_read_enter(); 5640 IFADDR_READER_FOREACH(ifa, ifp) { 5641 if (ifa->ifa_addr->sa_family == AF_INET) { 5642 si = (struct sockaddr_in *)ifa->ifa_addr; 5643 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5644 break; 5645 } 5646 } 5647 pserialize_read_exit(s); 5648 5649 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 5650 myaddr = sp->ipcp.req_myaddr; 5651 else if (si != NULL) 5652 myaddr = ntohl(si->sin_addr.s_addr); 5653 5654 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 5655 hisaddr = sp->ipcp.req_hisaddr; 5656 else if (dest != NULL) 5657 hisaddr = ntohl(dest->sin_addr.s_addr); 5658 5659 if (si != NULL && dest != NULL) { 5660 int error; 5661 struct sockaddr_in new_sin = *si; 5662 struct sockaddr_in new_dst = *dest; 5663 5664 if (myaddr != 0) 5665 new_sin.sin_addr.s_addr = htonl(myaddr); 5666 if (hisaddr != 0) { 5667 new_dst.sin_addr.s_addr = htonl(hisaddr); 5668 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) 5669 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 5670 } 5671 5672 in_addrhash_remove(ifatoia(ifa)); 5673 5674 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5675 5676 in_addrhash_insert(ifatoia(ifa)); 5677 5678 if (error) { 5679 SPPP_DLOG(sp, "%s: in_ifinit failed, error=%d\n", 5680 __func__, error); 5681 } else { 5682 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5683 } 5684 } 5685 5686 IFNET_UNLOCK(ifp); 5687 5688 sppp_notify_con(sp); 5689 } 5690 5691 /* 5692 * Clear IP addresses. Must be called at splnet. 5693 */ 5694 static void 5695 sppp_clear_ip_addrs(struct sppp *sp) 5696 { 5697 struct ifnet *ifp; 5698 struct ifaddr *ifa; 5699 struct sockaddr_in *si, *dest; 5700 int s; 5701 5702 KASSERT(SPPP_WLOCKED(sp)); 5703 5704 ifp = &sp->pp_if; 5705 5706 SPPP_UNLOCK(sp); 5707 IFNET_LOCK(ifp); 5708 SPPP_LOCK(sp, RW_WRITER); 5709 5710 /* 5711 * Pick the first AF_INET address from the list, 5712 * aliases don't make any sense on a p2p link anyway. 5713 */ 5714 si = dest = NULL; 5715 s = pserialize_read_enter(); 5716 IFADDR_READER_FOREACH(ifa, ifp) { 5717 if (ifa->ifa_addr->sa_family == AF_INET) { 5718 si = (struct sockaddr_in *)ifa->ifa_addr; 5719 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5720 break; 5721 } 5722 } 5723 pserialize_read_exit(s); 5724 5725 if (si != NULL) { 5726 struct sockaddr_in new_sin = *si; 5727 struct sockaddr_in new_dst = *dest; 5728 int error; 5729 5730 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 5731 new_sin.sin_addr.s_addr = 0; 5732 if (sp->ipcp.flags & IPCP_HISADDR_DYN && 5733 ntohl(sp->ipcp.saved_hisaddr) != 0) 5734 new_dst.sin_addr.s_addr = sp->ipcp.saved_hisaddr; 5735 5736 in_addrhash_remove(ifatoia(ifa)); 5737 5738 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5739 5740 in_addrhash_insert(ifatoia(ifa)); 5741 5742 if (error) { 5743 SPPP_DLOG(sp, "%s: in_ifinit failed, error=%d\n", 5744 __func__, error); 5745 } else { 5746 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5747 } 5748 } 5749 5750 IFNET_UNLOCK(ifp); 5751 } 5752 #endif 5753 5754 #ifdef INET6 5755 /* 5756 * Get both IPv6 addresses. 5757 */ 5758 static void 5759 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5760 struct in6_addr *srcmask) 5761 { 5762 struct ifnet *ifp = &sp->pp_if; 5763 struct ifaddr *ifa; 5764 struct sockaddr_in6 *si, *sm; 5765 struct in6_addr ssrc, ddst; 5766 int s; 5767 struct psref psref; 5768 5769 sm = NULL; 5770 memset(&ssrc, 0, sizeof(ssrc)); 5771 memset(&ddst, 0, sizeof(ddst)); 5772 /* 5773 * Pick the first link-local AF_INET6 address from the list, 5774 * aliases don't make any sense on a p2p link anyway. 5775 */ 5776 si = 0; 5777 s = pserialize_read_enter(); 5778 IFADDR_READER_FOREACH(ifa, ifp) { 5779 if (ifa->ifa_addr->sa_family == AF_INET6) { 5780 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5781 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5782 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) { 5783 ifa_acquire(ifa, &psref); 5784 break; 5785 } 5786 } 5787 } 5788 pserialize_read_exit(s); 5789 5790 if (ifa) { 5791 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5792 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5793 if (srcmask) { 5794 memcpy(srcmask, &sm->sin6_addr, 5795 sizeof(*srcmask)); 5796 } 5797 } 5798 5799 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5800 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5801 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5802 ifa_release(ifa, &psref); 5803 } 5804 5805 if (dst) 5806 memcpy(dst, &ddst, sizeof(*dst)); 5807 if (src) 5808 memcpy(src, &ssrc, sizeof(*src)); 5809 } 5810 5811 #ifdef IPV6CP_MYIFID_DYN 5812 /* 5813 * Generate random ifid. 5814 */ 5815 static void 5816 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5817 { 5818 /* TBD */ 5819 } 5820 5821 /* 5822 * Set my IPv6 address. Must be called at splnet. 5823 */ 5824 static void 5825 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5826 { 5827 struct ifnet *ifp; 5828 struct ifaddr *ifa; 5829 struct sockaddr_in6 *sin6; 5830 int s; 5831 struct psref psref; 5832 5833 KASSERT(SPPP_WLOCKED(sp)); 5834 5835 ifp = &sp->pp_if; 5836 5837 SPPP_UNLOCK(sp); 5838 IFNET_LOCK(ifp); 5839 SPPP_LOCK(sp, RW_WRITER); 5840 5841 /* 5842 * Pick the first link-local AF_INET6 address from the list, 5843 * aliases don't make any sense on a p2p link anyway. 5844 */ 5845 5846 sin6 = NULL; 5847 s = pserialize_read_enter(); 5848 IFADDR_READER_FOREACH(ifa, ifp) 5849 { 5850 if (ifa->ifa_addr->sa_family == AF_INET6) 5851 { 5852 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5853 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 5854 ifa_acquire(ifa, &psref); 5855 break; 5856 } 5857 } 5858 } 5859 pserialize_read_exit(s); 5860 5861 if (ifa && sin6) 5862 { 5863 int error; 5864 struct sockaddr_in6 new_sin6 = *sin6; 5865 5866 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5867 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5868 if (error) { 5869 SPPP_DLOG(sp, "%s: in6_ifinit failed, error=%d\n", 5870 __func__, error); 5871 } else { 5872 pfil_run_addrhooks(if_pfil, SIOCAIFADDR_IN6, ifa); 5873 } 5874 ifa_release(ifa, &psref); 5875 } 5876 5877 IFNET_UNLOCK(ifp); 5878 } 5879 #endif 5880 5881 /* 5882 * Suggest a candidate address to be used by peer. 5883 */ 5884 static void 5885 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5886 { 5887 struct in6_addr myaddr; 5888 struct timeval tv; 5889 5890 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5891 5892 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5893 microtime(&tv); 5894 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5895 myaddr.s6_addr[14] ^= 0xff; 5896 myaddr.s6_addr[15] ^= 0xff; 5897 } else { 5898 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5899 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5900 } 5901 if (suggest) 5902 memcpy(suggest, &myaddr, sizeof(myaddr)); 5903 } 5904 #endif /*INET6*/ 5905 5906 /* 5907 * Process ioctl requests specific to the PPP interface. 5908 * Permissions have already been checked. 5909 */ 5910 static int 5911 sppp_params(struct sppp *sp, u_long cmd, void *data) 5912 { 5913 switch (cmd) { 5914 case SPPPGETAUTHCFG: 5915 { 5916 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5917 int error; 5918 size_t len; 5919 5920 SPPP_LOCK(sp, RW_READER); 5921 5922 cfg->myauthflags = sp->myauth.flags; 5923 cfg->hisauthflags = sp->hisauth.flags; 5924 strlcpy(cfg->ifname, sp->pp_if.if_xname, sizeof(cfg->ifname)); 5925 cfg->hisauth = sppp_proto2authproto(sp->hisauth.proto); 5926 cfg->myauth = sppp_proto2authproto(sp->myauth.proto); 5927 if (cfg->myname_length == 0) { 5928 if (sp->myauth.name != NULL) 5929 cfg->myname_length = sp->myauth.name_len + 1; 5930 } else { 5931 if (sp->myauth.name == NULL) { 5932 cfg->myname_length = 0; 5933 } else { 5934 len = sp->myauth.name_len + 1; 5935 5936 if (cfg->myname_length < len) { 5937 SPPP_UNLOCK(sp); 5938 return (ENAMETOOLONG); 5939 } 5940 error = copyout(sp->myauth.name, cfg->myname, len); 5941 if (error) { 5942 SPPP_UNLOCK(sp); 5943 return error; 5944 } 5945 } 5946 } 5947 if (cfg->hisname_length == 0) { 5948 if (sp->hisauth.name != NULL) 5949 cfg->hisname_length = sp->hisauth.name_len + 1; 5950 } else { 5951 if (sp->hisauth.name == NULL) { 5952 cfg->hisname_length = 0; 5953 } else { 5954 len = sp->hisauth.name_len + 1; 5955 5956 if (cfg->hisname_length < len) { 5957 SPPP_UNLOCK(sp); 5958 return (ENAMETOOLONG); 5959 } 5960 error = copyout(sp->hisauth.name, cfg->hisname, len); 5961 if (error) { 5962 SPPP_UNLOCK(sp); 5963 return error; 5964 } 5965 } 5966 } 5967 SPPP_UNLOCK(sp); 5968 } 5969 break; 5970 case SPPPSETAUTHCFG: 5971 { 5972 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5973 int error; 5974 5975 SPPP_LOCK(sp, RW_WRITER); 5976 5977 if (sp->myauth.name) { 5978 free(sp->myauth.name, M_DEVBUF); 5979 sp->myauth.name = NULL; 5980 } 5981 if (sp->myauth.secret) { 5982 free(sp->myauth.secret, M_DEVBUF); 5983 sp->myauth.secret = NULL; 5984 } 5985 if (sp->hisauth.name) { 5986 free(sp->hisauth.name, M_DEVBUF); 5987 sp->hisauth.name = NULL; 5988 } 5989 if (sp->hisauth.secret) { 5990 free(sp->hisauth.secret, M_DEVBUF); 5991 sp->hisauth.secret = NULL; 5992 } 5993 5994 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5995 if (cfg->hisname_length >= MCLBYTES) { 5996 SPPP_UNLOCK(sp); 5997 return (ENAMETOOLONG); 5998 } 5999 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 6000 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 6001 if (error) { 6002 free(sp->hisauth.name, M_DEVBUF); 6003 sp->hisauth.name = NULL; 6004 SPPP_UNLOCK(sp); 6005 return error; 6006 } 6007 sp->hisauth.name_len = cfg->hisname_length - 1; 6008 sp->hisauth.name[sp->hisauth.name_len] = 0; 6009 } 6010 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 6011 if (cfg->hissecret_length >= MCLBYTES) { 6012 SPPP_UNLOCK(sp); 6013 return (ENAMETOOLONG); 6014 } 6015 sp->hisauth.secret = malloc(cfg->hissecret_length, 6016 M_DEVBUF, M_WAITOK); 6017 error = copyin(cfg->hissecret, sp->hisauth.secret, 6018 cfg->hissecret_length); 6019 if (error) { 6020 free(sp->hisauth.secret, M_DEVBUF); 6021 sp->hisauth.secret = NULL; 6022 SPPP_UNLOCK(sp); 6023 return error; 6024 } 6025 sp->hisauth.secret_len = cfg->hissecret_length - 1; 6026 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 6027 } 6028 if (cfg->myname != NULL && cfg->myname_length > 0) { 6029 if (cfg->myname_length >= MCLBYTES) { 6030 SPPP_UNLOCK(sp); 6031 return (ENAMETOOLONG); 6032 } 6033 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 6034 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 6035 if (error) { 6036 free(sp->myauth.name, M_DEVBUF); 6037 sp->myauth.name = NULL; 6038 SPPP_UNLOCK(sp); 6039 return error; 6040 } 6041 sp->myauth.name_len = cfg->myname_length - 1; 6042 sp->myauth.name[sp->myauth.name_len] = 0; 6043 } 6044 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 6045 if (cfg->mysecret_length >= MCLBYTES) { 6046 SPPP_UNLOCK(sp); 6047 return (ENAMETOOLONG); 6048 } 6049 sp->myauth.secret = malloc(cfg->mysecret_length, 6050 M_DEVBUF, M_WAITOK); 6051 error = copyin(cfg->mysecret, sp->myauth.secret, 6052 cfg->mysecret_length); 6053 if (error) { 6054 free(sp->myauth.secret, M_DEVBUF); 6055 sp->myauth.secret = NULL; 6056 SPPP_UNLOCK(sp); 6057 return error; 6058 } 6059 sp->myauth.secret_len = cfg->mysecret_length - 1; 6060 sp->myauth.secret[sp->myauth.secret_len] = 0; 6061 } 6062 sp->myauth.flags = cfg->myauthflags; 6063 if (cfg->myauth != SPPP_AUTHPROTO_NOCHG) { 6064 sp->myauth.proto = sppp_authproto2proto(cfg->myauth); 6065 } 6066 sp->hisauth.flags = cfg->hisauthflags; 6067 if (cfg->hisauth != SPPP_AUTHPROTO_NOCHG) { 6068 sp->hisauth.proto = sppp_authproto2proto(cfg->hisauth); 6069 } 6070 sp->pp_auth_failures = 0; 6071 if (sp->hisauth.proto != PPP_NOPROTO) 6072 SET(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO); 6073 else 6074 CLR(sp->lcp.opts, SPPP_LCP_OPT_AUTH_PROTO); 6075 6076 SPPP_UNLOCK(sp); 6077 } 6078 break; 6079 case SPPPGETLCPCFG: 6080 { 6081 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 6082 6083 SPPP_LOCK(sp, RW_READER); 6084 lcpp->lcp_timeout = sp->lcp.timeout; 6085 SPPP_UNLOCK(sp); 6086 } 6087 break; 6088 case SPPPSETLCPCFG: 6089 { 6090 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 6091 6092 SPPP_LOCK(sp, RW_WRITER); 6093 sp->lcp.timeout = lcpp->lcp_timeout; 6094 SPPP_UNLOCK(sp); 6095 } 6096 break; 6097 case SPPPGETNCPCFG: 6098 { 6099 struct spppncpcfg *ncpp = (struct spppncpcfg *) data; 6100 6101 SPPP_LOCK(sp, RW_READER); 6102 ncpp->ncp_flags = sp->pp_ncpflags; 6103 SPPP_UNLOCK(sp); 6104 } 6105 break; 6106 case SPPPSETNCPCFG: 6107 { 6108 struct spppncpcfg *ncpp = (struct spppncpcfg *) data; 6109 6110 SPPP_LOCK(sp, RW_WRITER); 6111 sp->pp_ncpflags = ncpp->ncp_flags; 6112 SPPP_UNLOCK(sp); 6113 } 6114 break; 6115 case SPPPGETSTATUS: 6116 { 6117 struct spppstatus *status = (struct spppstatus *)data; 6118 6119 SPPP_LOCK(sp, RW_READER); 6120 status->phase = sp->pp_phase; 6121 SPPP_UNLOCK(sp); 6122 } 6123 break; 6124 case SPPPGETSTATUSNCP: 6125 { 6126 struct spppstatusncp *status = (struct spppstatusncp *)data; 6127 6128 SPPP_LOCK(sp, RW_READER); 6129 status->phase = sp->pp_phase; 6130 status->ncpup = sppp_cp_check(sp, CP_NCP); 6131 SPPP_UNLOCK(sp); 6132 } 6133 break; 6134 case SPPPGETIDLETO: 6135 { 6136 struct spppidletimeout *to = (struct spppidletimeout *)data; 6137 6138 SPPP_LOCK(sp, RW_READER); 6139 to->idle_seconds = sp->pp_idle_timeout; 6140 SPPP_UNLOCK(sp); 6141 } 6142 break; 6143 case SPPPSETIDLETO: 6144 { 6145 struct spppidletimeout *to = (struct spppidletimeout *)data; 6146 6147 SPPP_LOCK(sp, RW_WRITER); 6148 sp->pp_idle_timeout = to->idle_seconds; 6149 SPPP_UNLOCK(sp); 6150 } 6151 break; 6152 case SPPPSETAUTHFAILURE: 6153 { 6154 struct spppauthfailuresettings *afsettings = 6155 (struct spppauthfailuresettings *)data; 6156 6157 SPPP_LOCK(sp, RW_WRITER); 6158 sp->pp_max_auth_fail = afsettings->max_failures; 6159 sp->pp_auth_failures = 0; 6160 SPPP_UNLOCK(sp); 6161 } 6162 break; 6163 case SPPPGETAUTHFAILURES: 6164 { 6165 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 6166 6167 SPPP_LOCK(sp, RW_READER); 6168 stats->auth_failures = sp->pp_auth_failures; 6169 stats->max_failures = sp->pp_max_auth_fail; 6170 SPPP_UNLOCK(sp); 6171 } 6172 break; 6173 case SPPPSETDNSOPTS: 6174 { 6175 struct spppdnssettings *req = (struct spppdnssettings *)data; 6176 6177 SPPP_LOCK(sp, RW_WRITER); 6178 sp->query_dns = req->query_dns & 3; 6179 SPPP_UNLOCK(sp); 6180 } 6181 break; 6182 case SPPPGETDNSOPTS: 6183 { 6184 struct spppdnssettings *req = (struct spppdnssettings *)data; 6185 6186 SPPP_LOCK(sp, RW_READER); 6187 req->query_dns = sp->query_dns; 6188 SPPP_UNLOCK(sp); 6189 } 6190 break; 6191 case SPPPGETDNSADDRS: 6192 { 6193 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 6194 6195 SPPP_LOCK(sp, RW_READER); 6196 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 6197 SPPP_UNLOCK(sp); 6198 } 6199 break; 6200 case SPPPGETKEEPALIVE: 6201 { 6202 struct spppkeepalivesettings *settings = 6203 (struct spppkeepalivesettings*)data; 6204 6205 SPPP_LOCK(sp, RW_READER); 6206 settings->maxalive = sp->pp_maxalive; 6207 settings->max_noreceive = sp->pp_max_noreceive; 6208 settings->alive_interval = sp->pp_alive_interval; 6209 SPPP_UNLOCK(sp); 6210 } 6211 break; 6212 case SPPPSETKEEPALIVE: 6213 { 6214 struct spppkeepalivesettings *settings = 6215 (struct spppkeepalivesettings*)data; 6216 6217 SPPP_LOCK(sp, RW_WRITER); 6218 sp->pp_maxalive = settings->maxalive; 6219 sp->pp_max_noreceive = settings->max_noreceive; 6220 sp->pp_alive_interval = settings->alive_interval; 6221 SPPP_UNLOCK(sp); 6222 } 6223 break; 6224 case SPPPGETLCPSTATUS: 6225 { 6226 struct sppplcpstatus *status = 6227 (struct sppplcpstatus *)data; 6228 6229 SPPP_LOCK(sp, RW_READER); 6230 status->state = sp->scp[IDX_LCP].state; 6231 status->opts = sp->lcp.opts; 6232 status->magic = sp->lcp.magic; 6233 status->mru = sp->lcp.mru; 6234 SPPP_UNLOCK(sp); 6235 } 6236 break; 6237 case SPPPGETIPCPSTATUS: 6238 { 6239 struct spppipcpstatus *status = 6240 (struct spppipcpstatus *)data; 6241 u_int32_t myaddr; 6242 6243 SPPP_LOCK(sp, RW_READER); 6244 status->state = sp->scp[IDX_IPCP].state; 6245 status->opts = sp->ipcp.opts; 6246 #ifdef INET 6247 kpreempt_disable(); 6248 sppp_get_ip_addrs(sp, &myaddr, 0, 0); 6249 kpreempt_enable(); 6250 #else 6251 myaddr = 0; 6252 #endif 6253 status->myaddr = ntohl(myaddr); 6254 SPPP_UNLOCK(sp); 6255 } 6256 break; 6257 case SPPPGETIPV6CPSTATUS: 6258 { 6259 struct spppipv6cpstatus *status = 6260 (struct spppipv6cpstatus *)data; 6261 6262 SPPP_LOCK(sp, RW_READER); 6263 status->state = sp->scp[IDX_IPV6CP].state; 6264 memcpy(status->my_ifid, sp->ipv6cp.my_ifid, 6265 sizeof(status->my_ifid)); 6266 memcpy(status->his_ifid, sp->ipv6cp.his_ifid, 6267 sizeof(status->his_ifid)); 6268 SPPP_UNLOCK(sp); 6269 } 6270 break; 6271 default: 6272 { 6273 int ret; 6274 6275 MODULE_HOOK_CALL(sppp_params_50_hook, (sp, cmd, data), 6276 enosys(), ret); 6277 if (ret != ENOSYS) 6278 return ret; 6279 return (EINVAL); 6280 } 6281 } 6282 return (0); 6283 } 6284 6285 static void 6286 sppp_phase_network(struct sppp *sp) 6287 { 6288 int i; 6289 6290 KASSERT(SPPP_WLOCKED(sp)); 6291 6292 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 6293 6294 /* Notify NCPs now. */ 6295 for (i = 0; i < IDX_COUNT; i++) 6296 if ((cps[i])->flags & CP_NCP) 6297 sppp_wq_add(sp->wq_cp, &sp->scp[i].work_open); 6298 } 6299 6300 static const char * 6301 sppp_cp_type_name(char *buf, size_t buflen, u_char type) 6302 { 6303 6304 switch (type) { 6305 case CONF_REQ: return "conf-req"; 6306 case CONF_ACK: return "conf-ack"; 6307 case CONF_NAK: return "conf-nak"; 6308 case CONF_REJ: return "conf-rej"; 6309 case TERM_REQ: return "term-req"; 6310 case TERM_ACK: return "term-ack"; 6311 case CODE_REJ: return "code-rej"; 6312 case PROTO_REJ: return "proto-rej"; 6313 case ECHO_REQ: return "echo-req"; 6314 case ECHO_REPLY: return "echo-reply"; 6315 case DISC_REQ: return "discard-req"; 6316 } 6317 if (buf != NULL) 6318 snprintf(buf, buflen, "0x%02x", type); 6319 return buf; 6320 } 6321 6322 static const char * 6323 sppp_auth_type_name(char *buf, size_t buflen, u_short proto, u_char type) 6324 { 6325 const char *name; 6326 6327 switch (proto) { 6328 case PPP_CHAP: 6329 switch (type) { 6330 case CHAP_CHALLENGE: return "challenge"; 6331 case CHAP_RESPONSE: return "response"; 6332 case CHAP_SUCCESS: return "success"; 6333 case CHAP_FAILURE: return "failure"; 6334 default: name = "chap"; break; 6335 } 6336 break; 6337 6338 case PPP_PAP: 6339 switch (type) { 6340 case PAP_REQ: return "req"; 6341 case PAP_ACK: return "ack"; 6342 case PAP_NAK: return "nak"; 6343 default: name = "pap"; break; 6344 } 6345 break; 6346 6347 default: 6348 name = "bad"; 6349 break; 6350 } 6351 6352 if (buf != NULL) 6353 snprintf(buf, buflen, "%s(%#x) 0x%02x", name, proto, type); 6354 return buf; 6355 } 6356 6357 static const char * 6358 sppp_lcp_opt_name(char *buf, size_t buflen, u_char opt) 6359 { 6360 6361 switch (opt) { 6362 case LCP_OPT_MRU: return "mru"; 6363 case LCP_OPT_ASYNC_MAP: return "async-map"; 6364 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 6365 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 6366 case LCP_OPT_MAGIC: return "magic"; 6367 case LCP_OPT_PROTO_COMP: return "proto-comp"; 6368 case LCP_OPT_ADDR_COMP: return "addr-comp"; 6369 case LCP_OPT_SELF_DESC_PAD: return "sdpad"; 6370 case LCP_OPT_CALL_BACK: return "callback"; 6371 case LCP_OPT_COMPOUND_FRMS: return "cmpd-frms"; 6372 case LCP_OPT_MP_MRRU: return "mrru"; 6373 case LCP_OPT_MP_SSNHF: return "mp-ssnhf"; 6374 case LCP_OPT_MP_EID: return "mp-eid"; 6375 } 6376 if (buf != NULL) 6377 snprintf(buf, buflen, "0x%02x", opt); 6378 return buf; 6379 } 6380 6381 static const char * 6382 sppp_ipcp_opt_name(char *buf, size_t buflen, u_char opt) 6383 { 6384 6385 switch (opt) { 6386 case IPCP_OPT_ADDRESSES: return "addresses"; 6387 case IPCP_OPT_COMPRESSION: return "compression"; 6388 case IPCP_OPT_ADDRESS: return "address"; 6389 case IPCP_OPT_PRIMDNS: return "primdns"; 6390 case IPCP_OPT_SECDNS: return "secdns"; 6391 } 6392 if (buf != NULL) 6393 snprintf(buf, buflen, "0x%02x", opt); 6394 return buf; 6395 } 6396 6397 #ifdef INET6 6398 static const char * 6399 sppp_ipv6cp_opt_name(char *buf, size_t buflen, u_char opt) 6400 { 6401 6402 switch (opt) { 6403 case IPV6CP_OPT_IFID: return "ifid"; 6404 case IPV6CP_OPT_COMPRESSION: return "compression"; 6405 } 6406 if (buf != NULL) 6407 snprintf(buf, buflen, "0x%02x", opt); 6408 return buf; 6409 } 6410 #endif 6411 6412 static const char * 6413 sppp_state_name(int state) 6414 { 6415 6416 switch (state) { 6417 case STATE_INITIAL: return "initial"; 6418 case STATE_STARTING: return "starting"; 6419 case STATE_CLOSED: return "closed"; 6420 case STATE_STOPPED: return "stopped"; 6421 case STATE_CLOSING: return "closing"; 6422 case STATE_STOPPING: return "stopping"; 6423 case STATE_REQ_SENT: return "req-sent"; 6424 case STATE_ACK_RCVD: return "ack-rcvd"; 6425 case STATE_ACK_SENT: return "ack-sent"; 6426 case STATE_OPENED: return "opened"; 6427 } 6428 return "illegal"; 6429 } 6430 6431 static const char * 6432 sppp_phase_name(int phase) 6433 { 6434 6435 switch (phase) { 6436 case SPPP_PHASE_DEAD: return "dead"; 6437 case SPPP_PHASE_ESTABLISH: return "establish"; 6438 case SPPP_PHASE_TERMINATE: return "terminate"; 6439 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 6440 case SPPP_PHASE_NETWORK: return "network"; 6441 } 6442 return "illegal"; 6443 } 6444 6445 static const char * 6446 sppp_proto_name(char *buf, size_t buflen, u_short proto) 6447 { 6448 6449 switch (proto) { 6450 case PPP_LCP: return "lcp"; 6451 case PPP_IPCP: return "ipcp"; 6452 case PPP_PAP: return "pap"; 6453 case PPP_CHAP: return "chap"; 6454 case PPP_IPV6CP: return "ipv6cp"; 6455 } 6456 if (buf != NULL) { 6457 snprintf(buf, sizeof(buf), "0x%04x", 6458 (unsigned)proto); 6459 } 6460 return buf; 6461 } 6462 6463 static void 6464 sppp_print_bytes(const u_char *p, u_short len) 6465 { 6466 addlog(" %02x", *p++); 6467 while (--len > 0) 6468 addlog("-%02x", *p++); 6469 } 6470 6471 static void 6472 sppp_print_string(const char *p, u_short len) 6473 { 6474 u_char c; 6475 6476 while (len-- > 0) { 6477 c = *p++; 6478 /* 6479 * Print only ASCII chars directly. RFC 1994 recommends 6480 * using only them, but we don't rely on it. */ 6481 if (c < ' ' || c > '~') 6482 addlog("\\x%x", c); 6483 else 6484 addlog("%c", c); 6485 } 6486 } 6487 6488 static const char * 6489 sppp_dotted_quad(char *buf, size_t buflen, uint32_t addr) 6490 { 6491 6492 if (buf != NULL) { 6493 snprintf(buf, buflen, "%u.%u.%u.%u", 6494 (unsigned int)((addr >> 24) & 0xff), 6495 (unsigned int)((addr >> 16) & 0xff), 6496 (unsigned int)((addr >> 8) & 0xff), 6497 (unsigned int)(addr & 0xff)); 6498 } 6499 return buf; 6500 } 6501 6502 /* a dummy, used to drop uninteresting events */ 6503 static void 6504 sppp_null(struct sppp *unused) 6505 { 6506 /* do just nothing */ 6507 } 6508 6509 static void 6510 sppp_tls(const struct cp *cp, struct sppp *sp) 6511 { 6512 6513 /* notify lcp that is lower layer */ 6514 sp->lcp.protos |= (1 << cp->protoidx); 6515 6516 if (sp->scp[IDX_LCP].state == STATE_OPENED) 6517 sppp_wq_add(sp->wq_cp, &sp->scp[cp->protoidx].work_up); 6518 } 6519 6520 static void 6521 sppp_tlf(const struct cp *cp, struct sppp *sp) 6522 { 6523 6524 SPPP_DLOG(sp, "%s tlf\n", cp->name); 6525 6526 /* notify lcp that is lower layer */ 6527 sp->lcp.protos &= ~(1 << cp->protoidx); 6528 6529 /* cleanup */ 6530 if (sp->scp[cp->protoidx].mbuf_confreq != NULL) { 6531 m_freem(sp->scp[cp->protoidx].mbuf_confreq); 6532 sp->scp[cp->protoidx].mbuf_confreq = NULL; 6533 } 6534 if (sp->scp[cp->protoidx].mbuf_confnak != NULL) { 6535 m_freem(sp->scp[cp->protoidx].mbuf_confnak); 6536 sp->scp[cp->protoidx].mbuf_confnak = NULL; 6537 } 6538 6539 sppp_lcp_check_and_close(sp); 6540 } 6541 6542 static void 6543 sppp_screply(const struct cp *cp, struct sppp *sp, u_char type, 6544 uint8_t ident, size_t msglen, void *msg) 6545 { 6546 6547 if (msglen == 0) 6548 return; 6549 6550 switch (type) { 6551 case CONF_ACK: 6552 case CONF_NAK: 6553 case CONF_REJ: 6554 break; 6555 default: 6556 return; 6557 } 6558 6559 if (sppp_debug_enabled(sp)) { 6560 char tbuf[SPPP_CPTYPE_NAMELEN]; 6561 const char *cpname; 6562 6563 cpname = sppp_cp_type_name(tbuf, sizeof(tbuf), type); 6564 SPPP_LOG(sp, LOG_DEBUG, "send %s\n", cpname); 6565 } 6566 6567 sppp_cp_send(sp, cp->proto, type, ident, msglen, msg); 6568 } 6569 6570 static void 6571 sppp_ifdown(struct sppp *sp, void *xcp __unused) 6572 { 6573 6574 SPPP_UNLOCK(sp); 6575 if_down(&sp->pp_if); 6576 IF_PURGE(&sp->pp_cpq); 6577 SPPP_LOCK(sp, RW_WRITER); 6578 } 6579 6580 static void 6581 sppp_notify_up(struct sppp *sp) 6582 { 6583 6584 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_up); 6585 } 6586 6587 static void 6588 sppp_notify_down(struct sppp *sp) 6589 { 6590 6591 sppp_wq_add(sp->wq_cp, &sp->scp[IDX_LCP].work_down); 6592 } 6593 6594 static void 6595 sppp_notify_tls_wlocked(struct sppp *sp) 6596 { 6597 6598 KASSERT(SPPP_WLOCKED(sp)); 6599 6600 if (!sp->pp_tls) 6601 return; 6602 6603 SPPP_UNLOCK(sp); 6604 sp->pp_tls(sp); 6605 SPPP_LOCK(sp, RW_WRITER); 6606 } 6607 6608 static void 6609 sppp_notify_tlf_wlocked(struct sppp *sp) 6610 { 6611 6612 KASSERT(SPPP_WLOCKED(sp)); 6613 6614 if (!sp->pp_tlf) 6615 return; 6616 6617 SPPP_UNLOCK(sp); 6618 sp->pp_tlf(sp); 6619 SPPP_LOCK(sp, RW_WRITER); 6620 } 6621 6622 static void 6623 sppp_notify_con(struct sppp *sp) 6624 { 6625 6626 if (!sp->pp_con) 6627 return; 6628 6629 sp->pp_con(sp); 6630 } 6631 6632 #ifdef INET6 6633 static void 6634 sppp_notify_con_wlocked(struct sppp *sp) 6635 { 6636 6637 KASSERT(SPPP_WLOCKED(sp)); 6638 6639 SPPP_UNLOCK(sp); 6640 sppp_notify_con(sp); 6641 SPPP_LOCK(sp, RW_WRITER); 6642 6643 } 6644 #endif 6645 6646 static void 6647 sppp_notify_chg_wlocked(struct sppp *sp) 6648 { 6649 6650 KASSERT(SPPP_WLOCKED(sp)); 6651 6652 if (!sp->pp_chg) 6653 return; 6654 6655 SPPP_UNLOCK(sp); 6656 sp->pp_chg(sp, sp->pp_phase); 6657 SPPP_LOCK(sp, RW_WRITER); 6658 } 6659 6660 static void 6661 sppp_wq_work(struct work *wk, void *xsp) 6662 { 6663 struct sppp *sp; 6664 struct sppp_work *work; 6665 6666 sp = xsp; 6667 work = container_of(wk, struct sppp_work, work); 6668 atomic_cas_uint(&work->state, SPPP_WK_BUSY, SPPP_WK_FREE); 6669 6670 SPPP_LOCK(sp, RW_WRITER); 6671 work->func(sp, work->arg); 6672 SPPP_UNLOCK(sp); 6673 } 6674 6675 static struct workqueue * 6676 sppp_wq_create(struct sppp *sp, const char *xnamebuf, pri_t prio, int ipl, int flags) 6677 { 6678 struct workqueue *wq; 6679 int error; 6680 6681 error = workqueue_create(&wq, xnamebuf, sppp_wq_work, 6682 (void *)sp, prio, ipl, flags); 6683 if (error) { 6684 panic("%s: workqueue_create failed [%s, %d]\n", 6685 sp->pp_if.if_xname, xnamebuf, error); 6686 } 6687 6688 return wq; 6689 } 6690 6691 static void 6692 sppp_wq_destroy(struct sppp *sp __unused, struct workqueue *wq) 6693 { 6694 6695 workqueue_destroy(wq); 6696 } 6697 6698 static void 6699 sppp_wq_set(struct sppp_work *work, 6700 void (*func)(struct sppp *, void *), void *arg) 6701 { 6702 6703 work->func = func; 6704 work->arg = arg; 6705 } 6706 6707 static void 6708 sppp_wq_add(struct workqueue *wq, struct sppp_work *work) 6709 { 6710 6711 if (atomic_cas_uint(&work->state, SPPP_WK_FREE, SPPP_WK_BUSY) 6712 != SPPP_WK_FREE) 6713 return; 6714 6715 KASSERT(work->func != NULL); 6716 kpreempt_disable(); 6717 workqueue_enqueue(wq, &work->work, NULL); 6718 kpreempt_enable(); 6719 } 6720 static void 6721 sppp_wq_wait(struct workqueue *wq, struct sppp_work *work) 6722 { 6723 6724 atomic_swap_uint(&work->state, SPPP_WK_UNAVAIL); 6725 workqueue_wait(wq, &work->work); 6726 } 6727 6728 /* 6729 * This file is large. Tell emacs to highlight it nevertheless. 6730 * 6731 * Local Variables: 6732 * hilit-auto-highlight-maxout: 120000 6733 * End: 6734 */ 6735 6736 /* 6737 * Module glue 6738 */ 6739 MODULE(MODULE_CLASS_MISC, sppp_subr, NULL); 6740 6741 static int 6742 sppp_subr_modcmd(modcmd_t cmd, void *arg) 6743 { 6744 6745 switch (cmd) { 6746 case MODULE_CMD_INIT: 6747 case MODULE_CMD_FINI: 6748 return 0; 6749 case MODULE_CMD_STAT: 6750 case MODULE_CMD_AUTOUNLOAD: 6751 default: 6752 return ENOTTY; 6753 } 6754 } 6755
Indexes created Fri Sep 26 20:09:58 GMT 2025