if_spppsubr.c revision 1.187.2.5
1 /* $NetBSD: if_spppsubr.c,v 1.187.2.5 2020/04/10 19:45:24 is 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 1.187.2.5 2020/04/10 19:45:24 is 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 #endif 52 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 73 #include <net/if.h> 74 #include <net/netisr.h> 75 #include <net/if_types.h> 76 #include <net/route.h> 77 #include <net/ppp_defs.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_systm.h> 81 #include <netinet/in_var.h> 82 #ifdef INET 83 #include <netinet/ip.h> 84 #include <netinet/tcp.h> 85 #endif 86 #include <net/ethertypes.h> 87 88 #ifdef INET6 89 #include <netinet6/scope6_var.h> 90 #endif 91 92 #include <net/if_sppp.h> 93 #include <net/if_spppvar.h> 94 95 #ifdef NET_MPSAFE 96 #define SPPPSUBR_MPSAFE 1 97 #endif 98 99 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 100 #define LOOPALIVECNT 3 /* loopback detection tries */ 101 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 102 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 103 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 104 105 /* 106 * Interface flags that can be set in an ifconfig command. 107 * 108 * Setting link0 will make the link passive, i.e. it will be marked 109 * as being administrative openable, but won't be opened to begin 110 * with. Incoming calls will be answered, or subsequent calls with 111 * -link1 will cause the administrative open of the LCP layer. 112 * 113 * Setting link1 will cause the link to auto-dial only as packets 114 * arrive to be sent. 115 * 116 * Setting IFF_DEBUG will syslog the option negotiation and state 117 * transitions at level kern.debug. Note: all logs consistently look 118 * like 119 * 120 * <if-name><unit>: <proto-name> <additional info...> 121 * 122 * with <if-name><unit> being something like "bppp0", and <proto-name> 123 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 124 */ 125 126 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 127 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 128 129 #define CONF_REQ 1 /* PPP configure request */ 130 #define CONF_ACK 2 /* PPP configure acknowledge */ 131 #define CONF_NAK 3 /* PPP configure negative ack */ 132 #define CONF_REJ 4 /* PPP configure reject */ 133 #define TERM_REQ 5 /* PPP terminate request */ 134 #define TERM_ACK 6 /* PPP terminate acknowledge */ 135 #define CODE_REJ 7 /* PPP code reject */ 136 #define PROTO_REJ 8 /* PPP protocol reject */ 137 #define ECHO_REQ 9 /* PPP echo request */ 138 #define ECHO_REPLY 10 /* PPP echo reply */ 139 #define DISC_REQ 11 /* PPP discard request */ 140 141 #define LCP_OPT_MRU 1 /* maximum receive unit */ 142 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 143 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 144 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 145 #define LCP_OPT_MAGIC 5 /* magic number */ 146 #define LCP_OPT_RESERVED 6 /* reserved */ 147 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 148 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 149 #define LCP_OPT_FCS_ALTS 9 /* FCS alternatives */ 150 #define LCP_OPT_SELF_DESC_PAD 10 /* self-describing padding */ 151 #define LCP_OPT_CALL_BACK 13 /* callback */ 152 #define LCP_OPT_COMPOUND_FRMS 15 /* compound frames */ 153 #define LCP_OPT_MP_MRRU 17 /* multilink MRRU */ 154 #define LCP_OPT_MP_SSNHF 18 /* multilink short seq. numbers */ 155 #define LCP_OPT_MP_EID 19 /* multilink endpoint discriminator */ 156 157 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 158 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 159 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 160 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 161 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 162 163 #define IPCP_UPDATE_LIMIT 8 /* limit of pending IP updating job */ 164 #define IPCP_SET_ADDRS 1 /* marker for IP address setting job */ 165 #define IPCP_CLEAR_ADDRS 2 /* marker for IP address clearing job */ 166 167 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 168 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 169 170 #define PAP_REQ 1 /* PAP name/password request */ 171 #define PAP_ACK 2 /* PAP acknowledge */ 172 #define PAP_NAK 3 /* PAP fail */ 173 174 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 175 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 176 #define CHAP_SUCCESS 3 /* CHAP response ok */ 177 #define CHAP_FAILURE 4 /* CHAP response failed */ 178 179 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 180 181 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 182 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 183 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 184 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 185 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 186 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 187 188 /* states are named and numbered according to RFC 1661 */ 189 #define STATE_INITIAL 0 190 #define STATE_STARTING 1 191 #define STATE_CLOSED 2 192 #define STATE_STOPPED 3 193 #define STATE_CLOSING 4 194 #define STATE_STOPPING 5 195 #define STATE_REQ_SENT 6 196 #define STATE_ACK_RCVD 7 197 #define STATE_ACK_SENT 8 198 #define STATE_OPENED 9 199 200 struct ppp_header { 201 uint8_t address; 202 uint8_t control; 203 uint16_t protocol; 204 } __packed; 205 #define PPP_HEADER_LEN sizeof (struct ppp_header) 206 207 struct lcp_header { 208 uint8_t type; 209 uint8_t ident; 210 uint16_t len; 211 } __packed; 212 #define LCP_HEADER_LEN sizeof (struct lcp_header) 213 214 struct cisco_packet { 215 uint32_t type; 216 uint32_t par1; 217 uint32_t par2; 218 uint16_t rel; 219 uint16_t time0; 220 uint16_t time1; 221 } __packed; 222 #define CISCO_PACKET_LEN 18 223 224 /* 225 * We follow the spelling and capitalization of RFC 1661 here, to make 226 * it easier comparing with the standard. Please refer to this RFC in 227 * case you can't make sense out of these abbreviation; it will also 228 * explain the semantics related to the various events and actions. 229 */ 230 struct cp { 231 u_short proto; /* PPP control protocol number */ 232 u_char protoidx; /* index into state table in struct sppp */ 233 u_char flags; 234 #define CP_LCP 0x01 /* this is the LCP */ 235 #define CP_AUTH 0x02 /* this is an authentication protocol */ 236 #define CP_NCP 0x04 /* this is a NCP */ 237 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 238 const char *name; /* name of this control protocol */ 239 /* event handlers */ 240 void (*Up)(struct sppp *sp); 241 void (*Down)(struct sppp *sp); 242 void (*Open)(struct sppp *sp); 243 void (*Close)(struct sppp *sp); 244 void (*TO)(void *sp); 245 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 246 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 247 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 248 /* actions */ 249 void (*tlu)(struct sppp *sp); 250 void (*tld)(struct sppp *sp); 251 void (*tls)(struct sppp *sp); 252 void (*tlf)(struct sppp *sp); 253 void (*scr)(struct sppp *sp); 254 }; 255 256 static struct sppp *spppq; 257 static kmutex_t *spppq_lock = NULL; 258 static callout_t keepalive_ch; 259 260 #define SPPPQ_LOCK() if (spppq_lock) \ 261 mutex_enter(spppq_lock); 262 #define SPPPQ_UNLOCK() if (spppq_lock) \ 263 mutex_exit(spppq_lock); 264 265 #define SPPP_LOCK(_sp, _op) rw_enter(&(_sp)->pp_lock, (_op)) 266 #define SPPP_UNLOCK(_sp) rw_exit(&(_sp)->pp_lock) 267 #define SPPP_WLOCKED(_sp) rw_write_held(&(_sp)->pp_lock) 268 #define SPPP_UPGRADE(_sp) do{ \ 269 SPPP_UNLOCK(_sp); \ 270 SPPP_LOCK(_sp, RW_WRITER); \ 271 }while (0) 272 #define SPPP_DOWNGRADE(_sp) rw_downgrade(&(_sp)->pp_lock) 273 274 #ifdef INET 275 #ifndef SPPPSUBR_MPSAFE 276 /* 277 * The following disgusting hack gets around the problem that IP TOS 278 * can't be set yet. We want to put "interactive" traffic on a high 279 * priority queue. To decide if traffic is interactive, we check that 280 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 281 * 282 * XXX is this really still necessary? - joerg - 283 */ 284 static u_short interactive_ports[8] = { 285 0, 513, 0, 0, 286 0, 21, 0, 23, 287 }; 288 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 289 #endif /* SPPPSUBR_MPSAFE */ 290 #endif 291 292 /* almost every function needs these */ 293 #define STDDCL \ 294 struct ifnet *ifp = &sp->pp_if; \ 295 int debug = ifp->if_flags & IFF_DEBUG 296 297 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 298 const struct sockaddr *dst, const struct rtentry *rt); 299 300 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 301 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 302 303 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 304 struct mbuf *m); 305 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 306 u_char ident, u_short len, void *data); 307 /* static void sppp_cp_timeout(void *arg); */ 308 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 309 int newstate); 310 static void sppp_auth_send(const struct cp *cp, 311 struct sppp *sp, unsigned int type, unsigned int id, 312 ...); 313 314 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 315 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 316 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 317 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 318 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 319 320 static void sppp_null(struct sppp *sp); 321 322 static void sppp_lcp_init(struct sppp *sp); 323 static void sppp_lcp_up(struct sppp *sp); 324 static void sppp_lcp_down(struct sppp *sp); 325 static void sppp_lcp_open(struct sppp *sp); 326 static void sppp_lcp_close(struct sppp *sp); 327 static void sppp_lcp_TO(void *sp); 328 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 329 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 330 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_lcp_tlu(struct sppp *sp); 332 static void sppp_lcp_tld(struct sppp *sp); 333 static void sppp_lcp_tls(struct sppp *sp); 334 static void sppp_lcp_tlf(struct sppp *sp); 335 static void sppp_lcp_scr(struct sppp *sp); 336 static void sppp_lcp_check_and_close(struct sppp *sp); 337 static int sppp_ncp_check(struct sppp *sp); 338 339 static struct mbuf *sppp_ml_defrag(struct sppp *sp, struct mbuf *m, 340 u_int16_t *protocolp); 341 342 static void sppp_ipcp_init(struct sppp *sp); 343 static void sppp_ipcp_up(struct sppp *sp); 344 static void sppp_ipcp_down(struct sppp *sp); 345 static void sppp_ipcp_open(struct sppp *sp); 346 static void sppp_ipcp_close(struct sppp *sp); 347 static void sppp_ipcp_TO(void *sp); 348 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 349 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 350 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 351 static void sppp_ipcp_tlu(struct sppp *sp); 352 static void sppp_ipcp_tld(struct sppp *sp); 353 static void sppp_ipcp_tls(struct sppp *sp); 354 static void sppp_ipcp_tlf(struct sppp *sp); 355 static void sppp_ipcp_scr(struct sppp *sp); 356 357 static void sppp_ipv6cp_init(struct sppp *sp); 358 static void sppp_ipv6cp_up(struct sppp *sp); 359 static void sppp_ipv6cp_down(struct sppp *sp); 360 static void sppp_ipv6cp_open(struct sppp *sp); 361 static void sppp_ipv6cp_close(struct sppp *sp); 362 static void sppp_ipv6cp_TO(void *sp); 363 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 364 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 365 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 366 static void sppp_ipv6cp_tlu(struct sppp *sp); 367 static void sppp_ipv6cp_tld(struct sppp *sp); 368 static void sppp_ipv6cp_tls(struct sppp *sp); 369 static void sppp_ipv6cp_tlf(struct sppp *sp); 370 static void sppp_ipv6cp_scr(struct sppp *sp); 371 372 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 373 static void sppp_pap_init(struct sppp *sp); 374 static void sppp_pap_open(struct sppp *sp); 375 static void sppp_pap_close(struct sppp *sp); 376 static void sppp_pap_TO(void *sp); 377 static void sppp_pap_my_TO(void *sp); 378 static void sppp_pap_tlu(struct sppp *sp); 379 static void sppp_pap_tld(struct sppp *sp); 380 static void sppp_pap_scr(struct sppp *sp); 381 382 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 383 static void sppp_chap_init(struct sppp *sp); 384 static void sppp_chap_open(struct sppp *sp); 385 static void sppp_chap_close(struct sppp *sp); 386 static void sppp_chap_TO(void *sp); 387 static void sppp_chap_tlu(struct sppp *sp); 388 static void sppp_chap_tld(struct sppp *sp); 389 static void sppp_chap_scr(struct sppp *sp); 390 391 static const char *sppp_auth_type_name(u_short proto, u_char type); 392 static const char *sppp_cp_type_name(u_char type); 393 static const char *sppp_dotted_quad(uint32_t addr); 394 static const char *sppp_ipcp_opt_name(u_char opt); 395 #ifdef INET6 396 static const char *sppp_ipv6cp_opt_name(u_char opt); 397 #endif 398 static const char *sppp_lcp_opt_name(u_char opt); 399 static const char *sppp_phase_name(int phase); 400 static const char *sppp_proto_name(u_short proto); 401 static const char *sppp_state_name(int state); 402 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 403 #ifdef INET 404 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 405 uint32_t *srcmask); 406 static void sppp_set_ip_addrs_work(struct work *wk, struct sppp *sp); 407 static void sppp_set_ip_addrs(struct sppp *sp); 408 static void sppp_clear_ip_addrs_work(struct work *wk, struct sppp *sp); 409 static void sppp_clear_ip_addrs(struct sppp *sp); 410 static void sppp_update_ip_addrs_work(struct work *wk, void *arg); 411 #endif 412 static void sppp_keepalive(void *dummy); 413 static void sppp_phase_network(struct sppp *sp); 414 static void sppp_print_bytes(const u_char *p, u_short len); 415 static void sppp_print_string(const char *p, u_short len); 416 #ifdef INET6 417 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 418 struct in6_addr *dst, struct in6_addr *srcmask); 419 #ifdef IPV6CP_MYIFID_DYN 420 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 421 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 422 #endif 423 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 424 #endif 425 426 static void sppp_notify_up(struct sppp *); 427 static void sppp_notify_down(struct sppp *); 428 static void sppp_notify_tls_wlocked(struct sppp *); 429 static void sppp_notify_tlf_wlocked(struct sppp *); 430 #ifdef INET6 431 static void sppp_notify_con_wlocked(struct sppp *); 432 #endif 433 static void sppp_notify_con(struct sppp *); 434 435 static void sppp_notify_chg_wlocked(struct sppp *); 436 437 438 /* our control protocol descriptors */ 439 static const struct cp lcp = { 440 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 441 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 442 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 443 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 444 sppp_lcp_scr 445 }; 446 447 static const struct cp ipcp = { 448 PPP_IPCP, IDX_IPCP, 449 #ifdef INET 450 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 451 #else 452 0, 453 #endif 454 "ipcp", 455 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 456 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 457 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 458 sppp_ipcp_scr 459 }; 460 461 static const struct cp ipv6cp = { 462 PPP_IPV6CP, IDX_IPV6CP, 463 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 464 CP_NCP, 465 #else 466 0, 467 #endif 468 "ipv6cp", 469 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 470 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 471 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 472 sppp_ipv6cp_scr 473 }; 474 475 static const struct cp pap = { 476 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 477 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 478 sppp_pap_TO, 0, 0, 0, 479 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 480 sppp_pap_scr 481 }; 482 483 static const struct cp chap = { 484 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 485 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 486 sppp_chap_TO, 0, 0, 0, 487 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 488 sppp_chap_scr 489 }; 490 491 static const struct cp *cps[IDX_COUNT] = { 492 &lcp, /* IDX_LCP */ 493 &ipcp, /* IDX_IPCP */ 494 &ipv6cp, /* IDX_IPV6CP */ 495 &pap, /* IDX_PAP */ 496 &chap, /* IDX_CHAP */ 497 }; 498 499 static void 500 sppp_change_phase(struct sppp *sp, int phase) 501 { 502 STDDCL; 503 504 KASSERT(SPPP_WLOCKED(sp)); 505 506 if (sp->pp_phase == phase) 507 return; 508 509 sp->pp_phase = phase; 510 511 if (phase == SPPP_PHASE_NETWORK) 512 if_link_state_change(ifp, LINK_STATE_UP); 513 else 514 if_link_state_change(ifp, LINK_STATE_DOWN); 515 516 if (debug) 517 { 518 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 519 sppp_phase_name(sp->pp_phase)); 520 } 521 } 522 523 524 /* 525 * Defragment an MP packet. 526 * 527 * Returns NULL or an assembled packet or the original, 528 * and adjusts the passed protocol to the inner one. 529 * 530 * Called with and returns a packet without PPP header, 531 * but with MP fragment header. 532 * 533 * Called and returns with lock held. 534 */ 535 static struct mbuf * 536 sppp_ml_defrag(struct sppp *sp, struct mbuf *m, u_int16_t *protocolp) 537 { 538 u_int8_t *p; 539 u_int8_t flags; 540 u_int32_t seqid; 541 u_int16_t protocol; 542 int newflen; 543 544 if (*protocolp != PPP_MP) 545 return m; /* not ours */ 546 547 if (sp->lcp.mrru == 0) 548 return m; /* 549 * ours, but we're not ready. 550 * sppp_input will arrange for rejection. 551 */ 552 553 if (m->m_len < 4) { 554 m = m_pullup(m, 4); 555 if (m == NULL) { 556 if_statadd2(&sp->pp_if, if_ierrors, 1, if_iqdrops, 1); 557 return NULL; 558 } 559 } 560 p = mtod(m, u_int8_t *); 561 flags = *p; 562 seqid = (p[1]<<16) + (p[2]<<8) + p[3]; 563 564 m_adj(m, 4); 565 566 /* We're manipulating the defragmentation state below: */ 567 SPPP_UPGRADE(sp); 568 569 if (flags & 0x80) { 570 /* Beginning fragment. */ 571 sp->lcp.ml_seq_xpctd=seqid+1; /* next expected */ 572 573 /* TODO: if prefix, count dropped? */ 574 575 m_freem(sp->lcp.ml_prefix); 576 sp->lcp.ml_prefix = m; 577 578 } else if (seqid == sp->lcp.ml_seq_xpctd) { 579 sp->lcp.ml_seq_xpctd=seqid+1; /* next expected */ 580 if (sp->lcp.ml_prefix == 0) { 581 /* didn't see B frame. */ 582 /* TODO: count as dropped. */ 583 m_freem(m); 584 return NULL; 585 } 586 /* 587 * m_cat might free the first mbuf (with pkthdr) 588 * in 2nd chain; therefore: 589 */ 590 newflen = m->m_pkthdr.len; 591 m_cat(sp->lcp.ml_prefix, m); 592 sp->lcp.ml_prefix->m_pkthdr.len += newflen; 593 594 } else { 595 /* 596 * sequence error. 597 * 598 * For now, only drop this fragment, and don't touch state- 599 * might be from the long past or future, and we could still 600 * finish our current prefix. 601 * 602 * TODO: count as dropped. 603 */ 604 m_freem(sp->lcp.ml_prefix); 605 return NULL; 606 } 607 /* Successfully got the Beginning or appended a non-B packet.*/ 608 if (flags & 0x40) { 609 /* B/next was E packet. Unwrap gift and deliver. */ 610 m = sp->lcp.ml_prefix; 611 sp->lcp.ml_prefix = NULL; 612 613 if (m->m_len < 2) { 614 m = m_pullup(m,2); 615 if (m == NULL) { 616 /* TODO: count as dropped. */ 617 return NULL; 618 } 619 } 620 /* RFC 1990 2.: don't assume no protocol field compression */ 621 p = mtod(m, u_int8_t *); 622 protocol = *p; 623 624 if (protocol & 1) { 625 m_adj(m, 1); 626 } else { 627 protocol = (protocol << 8) + p[1]; 628 m_adj(m, 2); 629 } 630 *protocolp = protocol; 631 632 return m; 633 } 634 635 return NULL; 636 } 637 638 639 /* 640 * Exported functions, comprising our interface to the lower layer. 641 */ 642 643 /* 644 * Process the received packet. 645 */ 646 void 647 sppp_input(struct ifnet *ifp, struct mbuf *m) 648 { 649 struct ppp_header *h = NULL; 650 pktqueue_t *pktq = NULL; 651 struct ifqueue *inq = NULL; 652 uint16_t protocol; 653 struct sppp *sp = (struct sppp *)ifp; 654 int debug = ifp->if_flags & IFF_DEBUG; 655 int isr = 0; 656 657 SPPP_LOCK(sp, RW_READER); 658 659 if (ifp->if_flags & IFF_UP) { 660 /* Count received bytes, add hardware framing */ 661 if_statadd(ifp, if_ibytes, m->m_pkthdr.len + sp->pp_framebytes); 662 /* Note time of last receive */ 663 sp->pp_last_receive = time_uptime; 664 } 665 666 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 667 /* Too small packet, drop it. */ 668 if (debug) 669 log(LOG_DEBUG, 670 "%s: input packet is too small, %d bytes\n", 671 ifp->if_xname, m->m_pkthdr.len); 672 drop: 673 if_statadd2(ifp, if_ierrors, 1, if_iqdrops, 1); 674 m_freem(m); 675 SPPP_UNLOCK(sp); 676 return; 677 } 678 679 if (sp->pp_flags & PP_NOFRAMING) { 680 memcpy(&protocol, mtod(m, void *), 2); 681 protocol = ntohs(protocol); 682 m_adj(m, 2); 683 } else { 684 685 /* Get PPP header. */ 686 h = mtod(m, struct ppp_header *); 687 m_adj(m, PPP_HEADER_LEN); 688 689 switch (h->address) { 690 case PPP_ALLSTATIONS: 691 if (h->control != PPP_UI) 692 goto invalid; 693 if (sp->pp_flags & PP_CISCO) { 694 if (debug) 695 log(LOG_DEBUG, 696 "%s: PPP packet in Cisco mode " 697 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 698 ifp->if_xname, 699 h->address, h->control, ntohs(h->protocol)); 700 goto drop; 701 } 702 break; 703 case CISCO_MULTICAST: 704 case CISCO_UNICAST: 705 /* Don't check the control field here (RFC 1547). */ 706 if (! (sp->pp_flags & PP_CISCO)) { 707 if (debug) 708 log(LOG_DEBUG, 709 "%s: Cisco packet in PPP mode " 710 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 711 ifp->if_xname, 712 h->address, h->control, ntohs(h->protocol)); 713 goto drop; 714 } 715 switch (ntohs(h->protocol)) { 716 default: 717 if_statinc(ifp, if_noproto); 718 goto invalid; 719 case CISCO_KEEPALIVE: 720 SPPP_UNLOCK(sp); 721 sppp_cisco_input((struct sppp *) ifp, m); 722 m_freem(m); 723 return; 724 #ifdef INET 725 case ETHERTYPE_IP: 726 pktq = ip_pktq; 727 break; 728 #endif 729 #ifdef INET6 730 case ETHERTYPE_IPV6: 731 pktq = ip6_pktq; 732 break; 733 #endif 734 } 735 goto queue_pkt; 736 default: /* Invalid PPP packet. */ 737 invalid: 738 if (debug) 739 log(LOG_DEBUG, 740 "%s: invalid input packet " 741 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 742 ifp->if_xname, 743 h->address, h->control, ntohs(h->protocol)); 744 goto drop; 745 } 746 protocol = ntohs(h->protocol); 747 } 748 749 m = sppp_ml_defrag(sp, m, &protocol); 750 if (m == 0) { 751 SPPP_UNLOCK(sp); 752 return; 753 } 754 755 switch (protocol) { 756 default: 757 if (sp->state[IDX_LCP] == STATE_OPENED) { 758 uint16_t prot = htons(protocol); 759 760 SPPP_UPGRADE(sp); 761 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 762 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 763 &prot); 764 SPPP_DOWNGRADE(sp); 765 } 766 if (debug) 767 log(LOG_DEBUG, 768 "%s: invalid input protocol " 769 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 770 if_statinc(ifp, if_noproto); 771 goto drop; 772 case PPP_LCP: 773 SPPP_UNLOCK(sp); 774 sppp_cp_input(&lcp, sp, m); 775 m_freem(m); 776 return; 777 case PPP_PAP: 778 SPPP_UNLOCK(sp); 779 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 780 sppp_pap_input(sp, m); 781 } 782 m_freem(m); 783 return; 784 case PPP_CHAP: 785 SPPP_UNLOCK(sp); 786 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 787 sppp_chap_input(sp, m); 788 } 789 m_freem(m); 790 return; 791 #ifdef INET 792 case PPP_IPCP: 793 SPPP_UNLOCK(sp); 794 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 795 sppp_cp_input(&ipcp, sp, m); 796 } 797 m_freem(m); 798 return; 799 case PPP_IP: 800 if (sp->state[IDX_IPCP] == STATE_OPENED) { 801 sp->pp_last_activity = time_uptime; 802 pktq = ip_pktq; 803 } 804 break; 805 #endif 806 #ifdef INET6 807 case PPP_IPV6CP: 808 SPPP_UNLOCK(sp); 809 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 810 sppp_cp_input(&ipv6cp, sp, m); 811 } 812 m_freem(m); 813 return; 814 815 case PPP_IPV6: 816 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 817 sp->pp_last_activity = time_uptime; 818 pktq = ip6_pktq; 819 } 820 break; 821 #endif 822 } 823 824 queue_pkt: 825 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 826 goto drop; 827 } 828 829 /* Check queue. */ 830 if (__predict_true(pktq)) { 831 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 832 goto drop; 833 } 834 SPPP_UNLOCK(sp); 835 return; 836 } 837 838 SPPP_UNLOCK(sp); 839 840 IFQ_LOCK(inq); 841 if (IF_QFULL(inq)) { 842 /* Queue overflow. */ 843 IF_DROP(inq); 844 IFQ_UNLOCK(inq); 845 if (debug) 846 log(LOG_DEBUG, "%s: protocol queue overflow\n", 847 ifp->if_xname); 848 849 SPPP_LOCK(sp, RW_READER); 850 goto drop; 851 } 852 IF_ENQUEUE(inq, m); 853 IFQ_UNLOCK(inq); 854 schednetisr(isr); 855 } 856 857 /* 858 * Enqueue transmit packet. 859 */ 860 static int 861 sppp_output(struct ifnet *ifp, struct mbuf *m, 862 const struct sockaddr *dst, const struct rtentry *rt) 863 { 864 struct sppp *sp = (struct sppp *) ifp; 865 struct ppp_header *h = NULL; 866 #ifndef SPPPSUBR_MPSAFE 867 struct ifqueue *ifq = NULL; /* XXX */ 868 #endif 869 int s, error = 0; 870 uint16_t protocol; 871 size_t pktlen; 872 873 s = splnet(); 874 SPPP_LOCK(sp, RW_READER); 875 876 sp->pp_last_activity = time_uptime; 877 878 if ((ifp->if_flags & IFF_UP) == 0 || 879 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 880 SPPP_UNLOCK(sp); 881 splx(s); 882 883 m_freem(m); 884 885 return (ENETDOWN); 886 } 887 888 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 889 /* 890 * Interface is not yet running, but auto-dial. Need 891 * to start LCP for it. 892 */ 893 ifp->if_flags |= IFF_RUNNING; 894 895 SPPP_UNLOCK(sp); 896 splx(s); 897 898 SPPP_LOCK(sp, RW_WRITER); 899 lcp.Open(sp); 900 SPPP_UNLOCK(sp); 901 902 s = splnet(); 903 SPPP_LOCK(sp, RW_READER); 904 } 905 906 /* 907 * If the queueing discipline needs packet classification, 908 * do it before prepending link headers. 909 */ 910 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 911 912 #ifdef INET 913 if (dst->sa_family == AF_INET) { 914 struct ip *ip = NULL; 915 #ifndef SPPPSUBR_MPSAFE 916 struct tcphdr *th = NULL; 917 #endif 918 919 if (m->m_len >= sizeof(struct ip)) { 920 ip = mtod(m, struct ip *); 921 #ifndef SPPPSUBR_MPSAFE 922 if (ip->ip_p == IPPROTO_TCP && 923 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 924 sizeof(struct tcphdr)) { 925 th = (struct tcphdr *) 926 ((char *)ip + (ip->ip_hl << 2)); 927 } 928 #endif 929 } else 930 ip = NULL; 931 932 /* 933 * When using dynamic local IP address assignment by using 934 * 0.0.0.0 as a local address, the first TCP session will 935 * not connect because the local TCP checksum is computed 936 * using 0.0.0.0 which will later become our real IP address 937 * so the TCP checksum computed at the remote end will 938 * become invalid. So we 939 * - don't let packets with src ip addr 0 thru 940 * - we flag TCP packets with src ip 0 as an error 941 */ 942 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 943 uint8_t proto = ip->ip_p; 944 945 SPPP_UNLOCK(sp); 946 splx(s); 947 948 m_freem(m); 949 if (proto == IPPROTO_TCP) 950 return (EADDRNOTAVAIL); 951 else 952 return (0); 953 } 954 955 #ifndef SPPPSUBR_MPSAFE 956 /* 957 * Put low delay, telnet, rlogin and ftp control packets 958 * in front of the queue. 959 */ 960 if (!IF_QFULL(&sp->pp_fastq) && 961 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 962 (th && (INTERACTIVE(ntohs(th->th_sport)) || 963 INTERACTIVE(ntohs(th->th_dport)))))) 964 ifq = &sp->pp_fastq; 965 #endif /* !SPPPSUBR_MPSAFE */ 966 } 967 #endif 968 969 #ifdef INET6 970 if (dst->sa_family == AF_INET6) { 971 /* XXX do something tricky here? */ 972 } 973 #endif 974 975 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 976 /* 977 * Prepend general data packet PPP header. For now, IP only. 978 */ 979 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 980 if (! m) { 981 if (ifp->if_flags & IFF_DEBUG) 982 log(LOG_DEBUG, "%s: no memory for transmit header\n", 983 ifp->if_xname); 984 if_statinc(ifp, if_oerrors); 985 SPPP_UNLOCK(sp); 986 splx(s); 987 return (ENOBUFS); 988 } 989 /* 990 * May want to check size of packet 991 * (albeit due to the implementation it's always enough) 992 */ 993 h = mtod(m, struct ppp_header *); 994 if (sp->pp_flags & PP_CISCO) { 995 h->address = CISCO_UNICAST; /* unicast address */ 996 h->control = 0; 997 } else { 998 h->address = PPP_ALLSTATIONS; /* broadcast address */ 999 h->control = PPP_UI; /* Unnumbered Info */ 1000 } 1001 } 1002 1003 switch (dst->sa_family) { 1004 #ifdef INET 1005 case AF_INET: /* Internet Protocol */ 1006 if (sp->pp_flags & PP_CISCO) 1007 protocol = htons(ETHERTYPE_IP); 1008 else { 1009 /* 1010 * Don't choke with an ENETDOWN early. It's 1011 * possible that we just started dialing out, 1012 * so don't drop the packet immediately. If 1013 * we notice that we run out of buffer space 1014 * below, we will however remember that we are 1015 * not ready to carry IP packets, and return 1016 * ENETDOWN, as opposed to ENOBUFS. 1017 */ 1018 protocol = htons(PPP_IP); 1019 if (sp->state[IDX_IPCP] != STATE_OPENED) 1020 error = ENETDOWN; 1021 } 1022 break; 1023 #endif 1024 #ifdef INET6 1025 case AF_INET6: /* Internet Protocol version 6 */ 1026 if (sp->pp_flags & PP_CISCO) 1027 protocol = htons(ETHERTYPE_IPV6); 1028 else { 1029 /* 1030 * Don't choke with an ENETDOWN early. It's 1031 * possible that we just started dialing out, 1032 * so don't drop the packet immediately. If 1033 * we notice that we run out of buffer space 1034 * below, we will however remember that we are 1035 * not ready to carry IP packets, and return 1036 * ENETDOWN, as opposed to ENOBUFS. 1037 */ 1038 protocol = htons(PPP_IPV6); 1039 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 1040 error = ENETDOWN; 1041 } 1042 break; 1043 #endif 1044 default: 1045 m_freem(m); 1046 if_statinc(ifp, if_oerrors); 1047 SPPP_UNLOCK(sp); 1048 splx(s); 1049 return (EAFNOSUPPORT); 1050 } 1051 1052 if (sp->pp_flags & PP_NOFRAMING) { 1053 M_PREPEND(m, 2, M_DONTWAIT); 1054 if (m == NULL) { 1055 if (ifp->if_flags & IFF_DEBUG) 1056 log(LOG_DEBUG, "%s: no memory for transmit header\n", 1057 ifp->if_xname); 1058 if_statinc(ifp, if_oerrors); 1059 SPPP_UNLOCK(sp); 1060 splx(s); 1061 return (ENOBUFS); 1062 } 1063 *mtod(m, uint16_t *) = protocol; 1064 } else { 1065 h->protocol = protocol; 1066 } 1067 1068 pktlen = m->m_pkthdr.len; 1069 #ifdef SPPPSUBR_MPSAFE 1070 SPPP_UNLOCK(sp); 1071 error = if_transmit_lock(ifp, m); 1072 SPPP_LOCK(sp, RW_READER); 1073 if (error == 0) 1074 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 1075 #else /* !SPPPSUBR_MPSAFE */ 1076 error = ifq_enqueue2(ifp, ifq, m); 1077 1078 if (error == 0) { 1079 /* 1080 * Count output packets and bytes. 1081 * The packet length includes header + additional hardware 1082 * framing according to RFC 1333. 1083 */ 1084 if (!(ifp->if_flags & IFF_OACTIVE)) { 1085 SPPP_UNLOCK(sp); 1086 if_start_lock(ifp); 1087 SPPP_LOCK(sp, RW_READER); 1088 } 1089 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 1090 } 1091 #endif /* !SPPPSUBR_MPSAFE */ 1092 SPPP_UNLOCK(sp); 1093 splx(s); 1094 return error; 1095 } 1096 1097 static int 1098 sppp_mediachange(struct ifnet *ifp) 1099 { 1100 1101 return (0); 1102 } 1103 1104 static void 1105 sppp_mediastatus(struct ifnet *ifp, struct ifmediareq *imr) 1106 { 1107 int link_state; 1108 1109 link_state = atomic_load_relaxed(&ifp->if_link_state); 1110 switch (link_state) { 1111 case LINK_STATE_UP: 1112 imr->ifm_status = IFM_AVALID | IFM_ACTIVE; 1113 break; 1114 case LINK_STATE_DOWN: 1115 imr->ifm_status = IFM_AVALID; 1116 break; 1117 default: 1118 /* Should be impossible as we set link state down in attach. */ 1119 imr->ifm_status = 0; 1120 break; 1121 } 1122 } 1123 1124 void 1125 sppp_attach(struct ifnet *ifp) 1126 { 1127 struct sppp *sp = (struct sppp *) ifp; 1128 1129 /* Initialize keepalive handler. */ 1130 if (! spppq) { 1131 callout_init(&keepalive_ch, CALLOUT_MPSAFE); 1132 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 1133 } 1134 1135 if (! spppq_lock) 1136 spppq_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 1137 1138 /* Insert new entry into the keepalive list. */ 1139 sp->pp_next = spppq; 1140 spppq = sp; 1141 1142 sp->pp_if.if_type = IFT_PPP; 1143 sp->pp_if.if_output = sppp_output; 1144 sp->pp_fastq.ifq_maxlen = 32; 1145 sp->pp_cpq.ifq_maxlen = 20; 1146 sp->pp_loopcnt = 0; 1147 sp->pp_alivecnt = 0; 1148 sp->pp_last_activity = 0; 1149 sp->pp_last_receive = 0; 1150 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 1151 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 1152 sp->pp_idle_timeout = 0; 1153 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 1154 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 1155 sp->pp_auth_failures = 0; 1156 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 1157 sp->pp_phase = SPPP_PHASE_DEAD; 1158 sp->pp_up = sppp_notify_up; 1159 sp->pp_down = sppp_notify_down; 1160 rw_init(&sp->pp_lock); 1161 1162 if_alloc_sadl(ifp); 1163 1164 /* Lets not beat about the bush, we know we're down. */ 1165 ifp->if_link_state = LINK_STATE_DOWN; 1166 /* There is no media for PPP, but it's needed to report link status. */ 1167 ifmedia_init(&sp->pp_im, 0, sppp_mediachange, sppp_mediastatus); 1168 1169 memset(&sp->myauth, 0, sizeof sp->myauth); 1170 memset(&sp->hisauth, 0, sizeof sp->hisauth); 1171 SPPP_LOCK(sp, RW_WRITER); 1172 sppp_lcp_init(sp); 1173 sppp_ipcp_init(sp); 1174 sppp_ipv6cp_init(sp); 1175 sppp_pap_init(sp); 1176 sppp_chap_init(sp); 1177 SPPP_UNLOCK(sp); 1178 } 1179 1180 void 1181 sppp_detach(struct ifnet *ifp) 1182 { 1183 struct sppp **q, *p, *sp = (struct sppp *) ifp; 1184 1185 /* Remove the entry from the keepalive list. */ 1186 SPPPQ_LOCK(); 1187 for (q = &spppq; (p = *q); q = &p->pp_next) 1188 if (p == sp) { 1189 *q = p->pp_next; 1190 break; 1191 } 1192 SPPPQ_UNLOCK(); 1193 1194 if (! spppq) { 1195 /* Stop keepalive handler. */ 1196 callout_stop(&keepalive_ch); 1197 mutex_obj_free(spppq_lock); 1198 spppq_lock = NULL; 1199 } 1200 1201 SPPP_LOCK(sp, RW_WRITER); 1202 1203 /* to avoid workqueue enqueued */ 1204 atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1); 1205 workqueue_wait(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk); 1206 workqueue_destroy(sp->ipcp.update_addrs_wq); 1207 pcq_destroy(sp->ipcp.update_addrs_q); 1208 1209 callout_stop(&sp->ch[IDX_LCP]); 1210 callout_stop(&sp->ch[IDX_IPCP]); 1211 callout_stop(&sp->ch[IDX_PAP]); 1212 callout_stop(&sp->ch[IDX_CHAP]); 1213 #ifdef INET6 1214 callout_stop(&sp->ch[IDX_IPV6CP]); 1215 #endif 1216 callout_stop(&sp->pap_my_to_ch); 1217 1218 /* free authentication info */ 1219 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 1220 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 1221 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 1222 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 1223 SPPP_UNLOCK(sp); 1224 rw_destroy(&sp->pp_lock); 1225 1226 ifmedia_fini(&sp->pp_im); 1227 } 1228 1229 /* 1230 * Flush the interface output queue. 1231 */ 1232 void 1233 sppp_flush(struct ifnet *ifp) 1234 { 1235 struct sppp *sp = (struct sppp *) ifp; 1236 1237 SPPP_LOCK(sp, RW_WRITER); 1238 IFQ_PURGE(&sp->pp_if.if_snd); 1239 IF_PURGE(&sp->pp_fastq); 1240 IF_PURGE(&sp->pp_cpq); 1241 SPPP_UNLOCK(sp); 1242 } 1243 1244 /* 1245 * Check if the output queue is empty. 1246 */ 1247 int 1248 sppp_isempty(struct ifnet *ifp) 1249 { 1250 struct sppp *sp = (struct sppp *) ifp; 1251 int empty, s; 1252 1253 s = splnet(); 1254 SPPP_LOCK(sp, RW_READER); 1255 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1256 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1257 SPPP_UNLOCK(sp); 1258 splx(s); 1259 return (empty); 1260 } 1261 1262 /* 1263 * Get next packet to send. 1264 */ 1265 struct mbuf * 1266 sppp_dequeue(struct ifnet *ifp) 1267 { 1268 struct sppp *sp = (struct sppp *) ifp; 1269 struct mbuf *m; 1270 int s; 1271 1272 s = splnet(); 1273 SPPP_LOCK(sp, RW_WRITER); 1274 /* 1275 * Process only the control protocol queue until we have at 1276 * least one NCP open. 1277 * 1278 * Do always serve all three queues in Cisco mode. 1279 */ 1280 IF_DEQUEUE(&sp->pp_cpq, m); 1281 if (m == NULL && 1282 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1283 IF_DEQUEUE(&sp->pp_fastq, m); 1284 if (m == NULL) 1285 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1286 } 1287 SPPP_UNLOCK(sp); 1288 splx(s); 1289 return m; 1290 } 1291 1292 /* 1293 * Process an ioctl request. Called on low priority level. 1294 */ 1295 int 1296 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1297 { 1298 struct lwp *l = curlwp; /* XXX */ 1299 struct ifreq *ifr = (struct ifreq *) data; 1300 struct ifaddr *ifa = (struct ifaddr *) data; 1301 struct sppp *sp = (struct sppp *) ifp; 1302 int s, error=0, going_up, going_down; 1303 u_short newmode; 1304 1305 s = splnet(); 1306 switch (cmd) { 1307 case SIOCINITIFADDR: 1308 ifa->ifa_rtrequest = p2p_rtrequest; 1309 break; 1310 1311 case SIOCSIFFLAGS: 1312 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1313 break; 1314 1315 SPPP_LOCK(sp, RW_WRITER); 1316 going_up = ifp->if_flags & IFF_UP && 1317 (ifp->if_flags & IFF_RUNNING) == 0; 1318 going_down = (ifp->if_flags & IFF_UP) == 0 && 1319 ifp->if_flags & IFF_RUNNING; 1320 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1321 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1322 /* sanity */ 1323 newmode = IFF_PASSIVE; 1324 ifp->if_flags &= ~IFF_AUTO; 1325 } 1326 1327 if (going_up || going_down) { 1328 lcp.Close(sp); 1329 } 1330 if (going_up && newmode == 0) { 1331 /* neither auto-dial nor passive */ 1332 ifp->if_flags |= IFF_RUNNING; 1333 if (!(sp->pp_flags & PP_CISCO)) 1334 lcp.Open(sp); 1335 } else if (going_down) { 1336 SPPP_UNLOCK(sp); 1337 sppp_flush(ifp); 1338 SPPP_LOCK(sp, RW_WRITER); 1339 1340 ifp->if_flags &= ~IFF_RUNNING; 1341 } 1342 SPPP_UNLOCK(sp); 1343 break; 1344 1345 case SIOCSIFMTU: 1346 if (ifr->ifr_mtu < PPP_MINMRU || 1347 ifr->ifr_mtu > sp->lcp.their_mru) { 1348 error = EINVAL; 1349 break; 1350 } 1351 /*FALLTHROUGH*/ 1352 case SIOCGIFMTU: 1353 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1354 error = 0; 1355 break; 1356 case SIOCADDMULTI: 1357 case SIOCDELMULTI: 1358 break; 1359 1360 case SPPPSETAUTHCFG: 1361 case SPPPSETLCPCFG: 1362 case SPPPSETIDLETO: 1363 case SPPPSETAUTHFAILURE: 1364 case SPPPSETDNSOPTS: 1365 case SPPPSETKEEPALIVE: 1366 #if defined(COMPAT_50) || defined(MODULAR) 1367 case __SPPPSETIDLETO50: 1368 case __SPPPSETKEEPALIVE50: 1369 #endif /* COMPAT_50 || MODULAR */ 1370 error = kauth_authorize_network(l->l_cred, 1371 KAUTH_NETWORK_INTERFACE, 1372 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1373 NULL); 1374 if (error) 1375 break; 1376 error = sppp_params(sp, cmd, data); 1377 break; 1378 1379 case SPPPGETAUTHCFG: 1380 case SPPPGETLCPCFG: 1381 case SPPPGETAUTHFAILURES: 1382 error = kauth_authorize_network(l->l_cred, 1383 KAUTH_NETWORK_INTERFACE, 1384 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1385 NULL); 1386 if (error) 1387 break; 1388 error = sppp_params(sp, cmd, data); 1389 break; 1390 1391 case SPPPGETSTATUS: 1392 case SPPPGETSTATUSNCP: 1393 case SPPPGETIDLETO: 1394 case SPPPGETDNSOPTS: 1395 case SPPPGETDNSADDRS: 1396 case SPPPGETKEEPALIVE: 1397 #if defined(COMPAT_50) || defined(MODULAR) 1398 case __SPPPGETIDLETO50: 1399 case __SPPPGETKEEPALIVE50: 1400 #endif /* COMPAT_50 || MODULAR */ 1401 error = sppp_params(sp, cmd, data); 1402 break; 1403 1404 case SIOCGIFMEDIA: 1405 error = ifmedia_ioctl(ifp, ifr, &sp->pp_im, cmd); 1406 break; 1407 1408 default: 1409 error = ifioctl_common(ifp, cmd, data); 1410 break; 1411 } 1412 splx(s); 1413 return (error); 1414 } 1415 1416 1417 /* 1418 * Cisco framing implementation. 1419 */ 1420 1421 /* 1422 * Handle incoming Cisco keepalive protocol packets. 1423 */ 1424 static void 1425 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1426 { 1427 STDDCL; 1428 struct cisco_packet *h; 1429 #ifdef INET 1430 uint32_t me, mymask = 0; /* XXX: GCC */ 1431 #endif 1432 1433 SPPP_LOCK(sp, RW_WRITER); 1434 1435 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1436 if (debug) 1437 log(LOG_DEBUG, 1438 "%s: cisco invalid packet length: %d bytes\n", 1439 ifp->if_xname, m->m_pkthdr.len); 1440 SPPP_UNLOCK(sp); 1441 return; 1442 } 1443 h = mtod(m, struct cisco_packet *); 1444 if (debug) 1445 log(LOG_DEBUG, 1446 "%s: cisco input: %d bytes " 1447 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1448 ifp->if_xname, m->m_pkthdr.len, 1449 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1450 (u_int)h->time0, (u_int)h->time1); 1451 switch (ntohl(h->type)) { 1452 default: 1453 if (debug) 1454 addlog("%s: cisco unknown packet type: 0x%x\n", 1455 ifp->if_xname, ntohl(h->type)); 1456 break; 1457 case CISCO_ADDR_REPLY: 1458 /* Reply on address request, ignore */ 1459 break; 1460 case CISCO_KEEPALIVE_REQ: 1461 sp->pp_alivecnt = 0; 1462 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1463 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1464 /* Local and remote sequence numbers are equal. 1465 * Probably, the line is in loopback mode. */ 1466 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1467 printf ("%s: loopback\n", 1468 ifp->if_xname); 1469 sp->pp_loopcnt = 0; 1470 if (ifp->if_flags & IFF_UP) { 1471 SPPP_UNLOCK(sp); 1472 if_down(ifp); 1473 SPPP_LOCK(sp, RW_WRITER); 1474 1475 IF_PURGE(&sp->pp_cpq); 1476 } 1477 } 1478 ++sp->pp_loopcnt; 1479 1480 /* Generate new local sequence number */ 1481 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1482 break; 1483 } 1484 sp->pp_loopcnt = 0; 1485 if (! (ifp->if_flags & IFF_UP) && 1486 (ifp->if_flags & IFF_RUNNING)) { 1487 SPPP_UNLOCK(sp); 1488 if_up(ifp); 1489 SPPP_LOCK(sp, RW_WRITER); 1490 } 1491 break; 1492 case CISCO_ADDR_REQ: 1493 #ifdef INET 1494 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1495 if (me != 0L) 1496 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1497 #endif 1498 break; 1499 } 1500 SPPP_UNLOCK(sp); 1501 } 1502 1503 /* 1504 * Send Cisco keepalive packet. 1505 */ 1506 static void 1507 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1508 { 1509 STDDCL; 1510 struct ppp_header *h; 1511 struct cisco_packet *ch; 1512 struct mbuf *m; 1513 uint32_t t; 1514 1515 KASSERT(SPPP_WLOCKED(sp)); 1516 1517 t = time_uptime * 1000; 1518 MGETHDR(m, M_DONTWAIT, MT_DATA); 1519 if (! m) 1520 return; 1521 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1522 m_reset_rcvif(m); 1523 1524 h = mtod(m, struct ppp_header *); 1525 h->address = CISCO_MULTICAST; 1526 h->control = 0; 1527 h->protocol = htons(CISCO_KEEPALIVE); 1528 1529 ch = (struct cisco_packet *)(h + 1); 1530 ch->type = htonl(type); 1531 ch->par1 = htonl(par1); 1532 ch->par2 = htonl(par2); 1533 ch->rel = -1; 1534 1535 ch->time0 = htons((u_short)(t >> 16)); 1536 ch->time1 = htons((u_short) t); 1537 1538 if (debug) 1539 log(LOG_DEBUG, 1540 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1541 ifp->if_xname, ntohl(ch->type), ch->par1, 1542 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1543 (u_int)ch->time1); 1544 1545 if (IF_QFULL(&sp->pp_cpq)) { 1546 IF_DROP(&sp->pp_fastq); 1547 IF_DROP(&ifp->if_snd); 1548 m_freem(m); 1549 if_statinc(ifp, if_oerrors); 1550 return; 1551 } 1552 1553 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 1554 IF_ENQUEUE(&sp->pp_cpq, m); 1555 1556 if (! (ifp->if_flags & IFF_OACTIVE)) { 1557 SPPP_UNLOCK(sp); 1558 if_start_lock(ifp); 1559 SPPP_LOCK(sp, RW_WRITER); 1560 } 1561 } 1562 1563 /* 1564 * PPP protocol implementation. 1565 */ 1566 1567 /* 1568 * Send PPP control protocol packet. 1569 */ 1570 static void 1571 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1572 u_char ident, u_short len, void *data) 1573 { 1574 STDDCL; 1575 struct lcp_header *lh; 1576 struct mbuf *m; 1577 size_t pkthdrlen; 1578 1579 KASSERT(SPPP_WLOCKED(sp)); 1580 1581 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1582 1583 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1584 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1585 MGETHDR(m, M_DONTWAIT, MT_DATA); 1586 if (! m) { 1587 return; 1588 } 1589 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1590 m_reset_rcvif(m); 1591 1592 if (sp->pp_flags & PP_NOFRAMING) { 1593 *mtod(m, uint16_t *) = htons(proto); 1594 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1595 } else { 1596 struct ppp_header *h; 1597 h = mtod(m, struct ppp_header *); 1598 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1599 h->control = PPP_UI; /* Unnumbered Info */ 1600 h->protocol = htons(proto); /* Link Control Protocol */ 1601 lh = (struct lcp_header *)(h + 1); 1602 } 1603 lh->type = type; 1604 lh->ident = ident; 1605 lh->len = htons(LCP_HEADER_LEN + len); 1606 if (len) 1607 memcpy(lh + 1, data, len); 1608 1609 if (debug) { 1610 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1611 ifp->if_xname, 1612 sppp_proto_name(proto), 1613 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1614 if (len) 1615 sppp_print_bytes((u_char *)(lh + 1), len); 1616 addlog(">\n"); 1617 } 1618 if (IF_QFULL(&sp->pp_cpq)) { 1619 IF_DROP(&sp->pp_fastq); 1620 IF_DROP(&ifp->if_snd); 1621 m_freem(m); 1622 if_statinc(ifp, if_oerrors); 1623 return; 1624 } 1625 1626 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 1627 IF_ENQUEUE(&sp->pp_cpq, m); 1628 1629 1630 if (! (ifp->if_flags & IFF_OACTIVE)) { 1631 SPPP_UNLOCK(sp); 1632 if_start_lock(ifp); 1633 SPPP_LOCK(sp, RW_WRITER); 1634 } 1635 } 1636 1637 /* 1638 * Handle incoming PPP control protocol packets. 1639 */ 1640 static void 1641 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1642 { 1643 STDDCL; 1644 struct lcp_header *h; 1645 int printlen, len = m->m_pkthdr.len; 1646 int rv; 1647 u_char *p; 1648 uint32_t u32; 1649 1650 SPPP_LOCK(sp, RW_WRITER); 1651 1652 if (len < 4) { 1653 if (debug) 1654 log(LOG_DEBUG, 1655 "%s: %s invalid packet length: %d bytes\n", 1656 ifp->if_xname, cp->name, len); 1657 SPPP_UNLOCK(sp); 1658 return; 1659 } 1660 h = mtod(m, struct lcp_header *); 1661 if (debug) { 1662 printlen = ntohs(h->len); 1663 log(LOG_DEBUG, 1664 "%s: %s input(%s): <%s id=0x%x len=%d", 1665 ifp->if_xname, cp->name, 1666 sppp_state_name(sp->state[cp->protoidx]), 1667 sppp_cp_type_name(h->type), h->ident, printlen); 1668 if (len < printlen) 1669 printlen = len; 1670 if (printlen > 4) 1671 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1672 addlog(">\n"); 1673 } 1674 if (len > ntohs(h->len)) 1675 len = ntohs(h->len); 1676 p = (u_char *)(h + 1); 1677 switch (h->type) { 1678 case CONF_REQ: 1679 if (len < 4) { 1680 if (debug) 1681 addlog("%s: %s invalid conf-req length %d\n", 1682 ifp->if_xname, cp->name, 1683 len); 1684 if_statinc(ifp, if_ierrors); 1685 break; 1686 } 1687 /* handle states where RCR doesn't get a SCA/SCN */ 1688 switch (sp->state[cp->protoidx]) { 1689 case STATE_CLOSING: 1690 case STATE_STOPPING: 1691 SPPP_UNLOCK(sp); 1692 return; 1693 case STATE_CLOSED: 1694 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1695 0, 0); 1696 SPPP_UNLOCK(sp); 1697 return; 1698 } 1699 rv = (cp->RCR)(sp, h, len); 1700 if (rv < 0) { 1701 /* fatal error, shut down */ 1702 (cp->tld)(sp); 1703 sppp_lcp_tlf(sp); 1704 SPPP_UNLOCK(sp); 1705 return; 1706 } 1707 switch (sp->state[cp->protoidx]) { 1708 case STATE_OPENED: 1709 (cp->tld)(sp); 1710 (cp->scr)(sp); 1711 /* fall through... */ 1712 case STATE_ACK_SENT: 1713 case STATE_REQ_SENT: 1714 sppp_cp_change_state(cp, sp, rv? 1715 STATE_ACK_SENT: STATE_REQ_SENT); 1716 break; 1717 case STATE_STOPPED: 1718 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1719 (cp->scr)(sp); 1720 sppp_cp_change_state(cp, sp, rv? 1721 STATE_ACK_SENT: STATE_REQ_SENT); 1722 break; 1723 case STATE_ACK_RCVD: 1724 if (rv) { 1725 sppp_cp_change_state(cp, sp, STATE_OPENED); 1726 if (debug) 1727 log(LOG_DEBUG, "%s: %s tlu\n", 1728 ifp->if_xname, 1729 cp->name); 1730 (cp->tlu)(sp); 1731 } else 1732 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1733 break; 1734 default: 1735 printf("%s: %s illegal %s in state %s\n", 1736 ifp->if_xname, cp->name, 1737 sppp_cp_type_name(h->type), 1738 sppp_state_name(sp->state[cp->protoidx])); 1739 if_statinc(ifp, if_ierrors); 1740 } 1741 break; 1742 case CONF_ACK: 1743 if (h->ident != sp->confid[cp->protoidx]) { 1744 if (debug) 1745 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1746 ifp->if_xname, cp->name, 1747 h->ident, sp->confid[cp->protoidx]); 1748 if_statinc(ifp, if_ierrors); 1749 break; 1750 } 1751 switch (sp->state[cp->protoidx]) { 1752 case STATE_CLOSED: 1753 case STATE_STOPPED: 1754 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1755 break; 1756 case STATE_CLOSING: 1757 case STATE_STOPPING: 1758 break; 1759 case STATE_REQ_SENT: 1760 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1761 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1762 break; 1763 case STATE_OPENED: 1764 (cp->tld)(sp); 1765 /* fall through */ 1766 case STATE_ACK_RCVD: 1767 (cp->scr)(sp); 1768 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1769 break; 1770 case STATE_ACK_SENT: 1771 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1772 sppp_cp_change_state(cp, sp, STATE_OPENED); 1773 if (debug) 1774 log(LOG_DEBUG, "%s: %s tlu\n", 1775 ifp->if_xname, cp->name); 1776 (cp->tlu)(sp); 1777 break; 1778 default: 1779 printf("%s: %s illegal %s in state %s\n", 1780 ifp->if_xname, cp->name, 1781 sppp_cp_type_name(h->type), 1782 sppp_state_name(sp->state[cp->protoidx])); 1783 if_statinc(ifp, if_ierrors); 1784 } 1785 break; 1786 case CONF_NAK: 1787 case CONF_REJ: 1788 if (h->ident != sp->confid[cp->protoidx]) { 1789 if (debug) 1790 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1791 ifp->if_xname, cp->name, 1792 h->ident, sp->confid[cp->protoidx]); 1793 if_statinc(ifp, if_ierrors); 1794 break; 1795 } 1796 if (h->type == CONF_NAK) 1797 (cp->RCN_nak)(sp, h, len); 1798 else /* CONF_REJ */ 1799 (cp->RCN_rej)(sp, h, len); 1800 1801 switch (sp->state[cp->protoidx]) { 1802 case STATE_CLOSED: 1803 case STATE_STOPPED: 1804 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1805 break; 1806 case STATE_REQ_SENT: 1807 case STATE_ACK_SENT: 1808 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1809 (cp->scr)(sp); 1810 break; 1811 case STATE_OPENED: 1812 (cp->tld)(sp); 1813 /* fall through */ 1814 case STATE_ACK_RCVD: 1815 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1816 (cp->scr)(sp); 1817 break; 1818 case STATE_CLOSING: 1819 case STATE_STOPPING: 1820 break; 1821 default: 1822 printf("%s: %s illegal %s in state %s\n", 1823 ifp->if_xname, cp->name, 1824 sppp_cp_type_name(h->type), 1825 sppp_state_name(sp->state[cp->protoidx])); 1826 if_statinc(ifp, if_ierrors); 1827 } 1828 break; 1829 1830 case TERM_REQ: 1831 switch (sp->state[cp->protoidx]) { 1832 case STATE_ACK_RCVD: 1833 case STATE_ACK_SENT: 1834 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1835 /* fall through */ 1836 case STATE_CLOSED: 1837 case STATE_STOPPED: 1838 case STATE_CLOSING: 1839 case STATE_STOPPING: 1840 case STATE_REQ_SENT: 1841 sta: 1842 /* Send Terminate-Ack packet. */ 1843 if (debug) 1844 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1845 ifp->if_xname, cp->name); 1846 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1847 break; 1848 case STATE_OPENED: 1849 (cp->tld)(sp); 1850 sp->rst_counter[cp->protoidx] = 0; 1851 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1852 goto sta; 1853 default: 1854 printf("%s: %s illegal %s in state %s\n", 1855 ifp->if_xname, cp->name, 1856 sppp_cp_type_name(h->type), 1857 sppp_state_name(sp->state[cp->protoidx])); 1858 if_statinc(ifp, if_ierrors); 1859 } 1860 break; 1861 case TERM_ACK: 1862 switch (sp->state[cp->protoidx]) { 1863 case STATE_CLOSED: 1864 case STATE_STOPPED: 1865 case STATE_REQ_SENT: 1866 case STATE_ACK_SENT: 1867 break; 1868 case STATE_CLOSING: 1869 (cp->tlf)(sp); 1870 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1871 sppp_lcp_check_and_close(sp); 1872 break; 1873 case STATE_STOPPING: 1874 (cp->tlf)(sp); 1875 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1876 sppp_lcp_check_and_close(sp); 1877 break; 1878 case STATE_ACK_RCVD: 1879 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1880 break; 1881 case STATE_OPENED: 1882 (cp->tld)(sp); 1883 (cp->scr)(sp); 1884 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1885 break; 1886 default: 1887 printf("%s: %s illegal %s in state %s\n", 1888 ifp->if_xname, cp->name, 1889 sppp_cp_type_name(h->type), 1890 sppp_state_name(sp->state[cp->protoidx])); 1891 if_statinc(ifp, if_ierrors); 1892 } 1893 break; 1894 case CODE_REJ: 1895 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1896 log(LOG_INFO, 1897 "%s: %s: ignoring RXJ (%s) for code ?, " 1898 "danger will robinson\n", 1899 ifp->if_xname, cp->name, 1900 sppp_cp_type_name(h->type)); 1901 switch (sp->state[cp->protoidx]) { 1902 case STATE_CLOSED: 1903 case STATE_STOPPED: 1904 case STATE_REQ_SENT: 1905 case STATE_ACK_SENT: 1906 case STATE_CLOSING: 1907 case STATE_STOPPING: 1908 case STATE_OPENED: 1909 break; 1910 case STATE_ACK_RCVD: 1911 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1912 break; 1913 default: 1914 printf("%s: %s illegal %s in state %s\n", 1915 ifp->if_xname, cp->name, 1916 sppp_cp_type_name(h->type), 1917 sppp_state_name(sp->state[cp->protoidx])); 1918 if_statinc(ifp, if_ierrors); 1919 } 1920 break; 1921 case PROTO_REJ: 1922 { 1923 int catastrophic; 1924 const struct cp *upper; 1925 int i; 1926 uint16_t proto; 1927 1928 catastrophic = 0; 1929 upper = NULL; 1930 proto = p[0] << 8 | p[1]; 1931 for (i = 0; i < IDX_COUNT; i++) { 1932 if (cps[i]->proto == proto) { 1933 upper = cps[i]; 1934 break; 1935 } 1936 } 1937 if (upper == NULL) 1938 catastrophic++; 1939 1940 if (debug) 1941 log(LOG_INFO, 1942 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1943 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1944 sppp_cp_type_name(h->type), proto, 1945 upper ? upper->name : "unknown", 1946 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1947 1948 /* 1949 * if we got RXJ+ against conf-req, the peer does not implement 1950 * this particular protocol type. terminate the protocol. 1951 */ 1952 if (upper && !catastrophic) { 1953 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1954 upper->Close(sp); 1955 break; 1956 } 1957 } 1958 1959 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1960 switch (sp->state[cp->protoidx]) { 1961 case STATE_CLOSED: 1962 case STATE_STOPPED: 1963 case STATE_REQ_SENT: 1964 case STATE_ACK_SENT: 1965 case STATE_CLOSING: 1966 case STATE_STOPPING: 1967 case STATE_OPENED: 1968 break; 1969 case STATE_ACK_RCVD: 1970 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1971 break; 1972 default: 1973 printf("%s: %s illegal %s in state %s\n", 1974 ifp->if_xname, cp->name, 1975 sppp_cp_type_name(h->type), 1976 sppp_state_name(sp->state[cp->protoidx])); 1977 if_statinc(ifp, if_ierrors); 1978 } 1979 break; 1980 } 1981 case DISC_REQ: 1982 if (cp->proto != PPP_LCP) 1983 goto illegal; 1984 /* Discard the packet. */ 1985 break; 1986 case ECHO_REQ: 1987 if (cp->proto != PPP_LCP) 1988 goto illegal; 1989 if (sp->state[cp->protoidx] != STATE_OPENED) { 1990 if (debug) 1991 addlog("%s: lcp echo req but lcp closed\n", 1992 ifp->if_xname); 1993 if_statinc(ifp, if_ierrors); 1994 break; 1995 } 1996 if (len < 8) { 1997 if (debug) 1998 addlog("%s: invalid lcp echo request " 1999 "packet length: %d bytes\n", 2000 ifp->if_xname, len); 2001 break; 2002 } 2003 memcpy(&u32, h + 1, sizeof u32); 2004 if (ntohl(u32) == sp->lcp.magic) { 2005 /* Line loopback mode detected. */ 2006 printf("%s: loopback\n", ifp->if_xname); 2007 SPPP_UNLOCK(sp); 2008 if_down(ifp); 2009 SPPP_LOCK(sp, RW_WRITER); 2010 2011 IF_PURGE(&sp->pp_cpq); 2012 2013 /* Shut down the PPP link. */ 2014 /* XXX */ 2015 lcp.Down(sp); 2016 lcp.Up(sp); 2017 break; 2018 } 2019 u32 = htonl(sp->lcp.magic); 2020 memcpy(h + 1, &u32, sizeof u32); 2021 if (debug) 2022 addlog("%s: got lcp echo req, sending echo rep\n", 2023 ifp->if_xname); 2024 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 2025 h + 1); 2026 break; 2027 case ECHO_REPLY: 2028 if (cp->proto != PPP_LCP) 2029 goto illegal; 2030 if (h->ident != sp->lcp.echoid) { 2031 if_statinc(ifp, if_ierrors); 2032 break; 2033 } 2034 if (len < 8) { 2035 if (debug) 2036 addlog("%s: lcp invalid echo reply " 2037 "packet length: %d bytes\n", 2038 ifp->if_xname, len); 2039 break; 2040 } 2041 if (debug) 2042 addlog("%s: lcp got echo rep\n", 2043 ifp->if_xname); 2044 memcpy(&u32, h + 1, sizeof u32); 2045 if (ntohl(u32) != sp->lcp.magic) 2046 sp->pp_alivecnt = 0; 2047 break; 2048 default: 2049 /* Unknown packet type -- send Code-Reject packet. */ 2050 illegal: 2051 if (debug) 2052 addlog("%s: %s send code-rej for 0x%x\n", 2053 ifp->if_xname, cp->name, h->type); 2054 sppp_cp_send(sp, cp->proto, CODE_REJ, 2055 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 2056 if_statinc(ifp, if_ierrors); 2057 } 2058 2059 SPPP_UNLOCK(sp); 2060 } 2061 2062 2063 /* 2064 * The generic part of all Up/Down/Open/Close/TO event handlers. 2065 * Basically, the state transition handling in the automaton. 2066 */ 2067 static void 2068 sppp_up_event(const struct cp *cp, struct sppp *sp) 2069 { 2070 STDDCL; 2071 2072 KASSERT(SPPP_WLOCKED(sp)); 2073 2074 if (debug) 2075 log(LOG_DEBUG, "%s: %s up(%s)\n", 2076 ifp->if_xname, cp->name, 2077 sppp_state_name(sp->state[cp->protoidx])); 2078 2079 switch (sp->state[cp->protoidx]) { 2080 case STATE_INITIAL: 2081 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2082 break; 2083 case STATE_STARTING: 2084 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 2085 (cp->scr)(sp); 2086 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2087 break; 2088 default: 2089 printf("%s: %s illegal up in state %s\n", 2090 ifp->if_xname, cp->name, 2091 sppp_state_name(sp->state[cp->protoidx])); 2092 } 2093 } 2094 2095 static void 2096 sppp_down_event(const struct cp *cp, struct sppp *sp) 2097 { 2098 STDDCL; 2099 2100 KASSERT(SPPP_WLOCKED(sp)); 2101 2102 if (debug) 2103 log(LOG_DEBUG, "%s: %s down(%s)\n", 2104 ifp->if_xname, cp->name, 2105 sppp_state_name(sp->state[cp->protoidx])); 2106 2107 switch (sp->state[cp->protoidx]) { 2108 case STATE_CLOSED: 2109 case STATE_CLOSING: 2110 sppp_cp_change_state(cp, sp, STATE_INITIAL); 2111 break; 2112 case STATE_STOPPED: 2113 (cp->tls)(sp); 2114 /* fall through */ 2115 case STATE_STOPPING: 2116 case STATE_REQ_SENT: 2117 case STATE_ACK_RCVD: 2118 case STATE_ACK_SENT: 2119 sppp_cp_change_state(cp, sp, STATE_STARTING); 2120 break; 2121 case STATE_OPENED: 2122 (cp->tld)(sp); 2123 sppp_cp_change_state(cp, sp, STATE_STARTING); 2124 break; 2125 default: 2126 printf("%s: %s illegal down in state %s\n", 2127 ifp->if_xname, cp->name, 2128 sppp_state_name(sp->state[cp->protoidx])); 2129 } 2130 } 2131 2132 2133 static void 2134 sppp_open_event(const struct cp *cp, struct sppp *sp) 2135 { 2136 STDDCL; 2137 2138 KASSERT(SPPP_WLOCKED(sp)); 2139 2140 if (debug) 2141 log(LOG_DEBUG, "%s: %s open(%s)\n", 2142 ifp->if_xname, cp->name, 2143 sppp_state_name(sp->state[cp->protoidx])); 2144 2145 switch (sp->state[cp->protoidx]) { 2146 case STATE_INITIAL: 2147 sppp_cp_change_state(cp, sp, STATE_STARTING); 2148 (cp->tls)(sp); 2149 break; 2150 case STATE_STARTING: 2151 break; 2152 case STATE_CLOSED: 2153 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 2154 (cp->scr)(sp); 2155 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2156 break; 2157 case STATE_STOPPED: 2158 case STATE_STOPPING: 2159 case STATE_REQ_SENT: 2160 case STATE_ACK_RCVD: 2161 case STATE_ACK_SENT: 2162 case STATE_OPENED: 2163 break; 2164 case STATE_CLOSING: 2165 sppp_cp_change_state(cp, sp, STATE_STOPPING); 2166 break; 2167 } 2168 } 2169 2170 2171 static void 2172 sppp_close_event(const struct cp *cp, struct sppp *sp) 2173 { 2174 STDDCL; 2175 2176 KASSERT(SPPP_WLOCKED(sp)); 2177 2178 if (debug) 2179 log(LOG_DEBUG, "%s: %s close(%s)\n", 2180 ifp->if_xname, cp->name, 2181 sppp_state_name(sp->state[cp->protoidx])); 2182 2183 switch (sp->state[cp->protoidx]) { 2184 case STATE_INITIAL: 2185 case STATE_CLOSED: 2186 case STATE_CLOSING: 2187 break; 2188 case STATE_STARTING: 2189 sppp_cp_change_state(cp, sp, STATE_INITIAL); 2190 (cp->tlf)(sp); 2191 break; 2192 case STATE_STOPPED: 2193 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2194 break; 2195 case STATE_STOPPING: 2196 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2197 break; 2198 case STATE_OPENED: 2199 (cp->tld)(sp); 2200 /* fall through */ 2201 case STATE_REQ_SENT: 2202 case STATE_ACK_RCVD: 2203 case STATE_ACK_SENT: 2204 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 2205 sppp_cp_send(sp, cp->proto, TERM_REQ, 2206 ++sp->pp_seq[cp->protoidx], 0, 0); 2207 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2208 break; 2209 } 2210 } 2211 2212 static void 2213 sppp_to_event(const struct cp *cp, struct sppp *sp) 2214 { 2215 STDDCL; 2216 int s; 2217 2218 KASSERT(SPPP_WLOCKED(sp)); 2219 2220 s = splnet(); 2221 2222 if (debug) 2223 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 2224 ifp->if_xname, cp->name, 2225 sppp_state_name(sp->state[cp->protoidx]), 2226 sp->rst_counter[cp->protoidx]); 2227 2228 if (--sp->rst_counter[cp->protoidx] < 0) 2229 /* TO- event */ 2230 switch (sp->state[cp->protoidx]) { 2231 case STATE_CLOSING: 2232 (cp->tlf)(sp); 2233 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2234 sppp_lcp_check_and_close(sp); 2235 break; 2236 case STATE_STOPPING: 2237 (cp->tlf)(sp); 2238 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2239 sppp_lcp_check_and_close(sp); 2240 break; 2241 case STATE_REQ_SENT: 2242 case STATE_ACK_RCVD: 2243 case STATE_ACK_SENT: 2244 (cp->tlf)(sp); 2245 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2246 sppp_lcp_check_and_close(sp); 2247 break; 2248 } 2249 else 2250 /* TO+ event */ 2251 switch (sp->state[cp->protoidx]) { 2252 case STATE_CLOSING: 2253 case STATE_STOPPING: 2254 sppp_cp_send(sp, cp->proto, TERM_REQ, 2255 ++sp->pp_seq[cp->protoidx], 0, 0); 2256 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2257 cp->TO, sp); 2258 break; 2259 case STATE_REQ_SENT: 2260 case STATE_ACK_RCVD: 2261 (cp->scr)(sp); 2262 /* sppp_cp_change_state() will restart the timer */ 2263 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2264 break; 2265 case STATE_ACK_SENT: 2266 (cp->scr)(sp); 2267 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2268 cp->TO, sp); 2269 break; 2270 } 2271 2272 splx(s); 2273 } 2274 2275 /* 2276 * Change the state of a control protocol in the state automaton. 2277 * Takes care of starting/stopping the restart timer. 2278 */ 2279 void 2280 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 2281 { 2282 2283 KASSERT(SPPP_WLOCKED(sp)); 2284 2285 sp->state[cp->protoidx] = newstate; 2286 callout_stop(&sp->ch[cp->protoidx]); 2287 switch (newstate) { 2288 case STATE_INITIAL: 2289 case STATE_STARTING: 2290 case STATE_CLOSED: 2291 case STATE_STOPPED: 2292 case STATE_OPENED: 2293 break; 2294 case STATE_CLOSING: 2295 case STATE_STOPPING: 2296 case STATE_REQ_SENT: 2297 case STATE_ACK_RCVD: 2298 case STATE_ACK_SENT: 2299 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2300 cp->TO, sp); 2301 break; 2302 } 2303 } 2304 2305 /* 2306 *--------------------------------------------------------------------------* 2307 * * 2308 * The LCP implementation. * 2309 * * 2310 *--------------------------------------------------------------------------* 2311 */ 2312 static void 2313 sppp_lcp_init(struct sppp *sp) 2314 { 2315 2316 KASSERT(SPPP_WLOCKED(sp)); 2317 2318 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2319 sp->lcp.magic = 0; 2320 sp->state[IDX_LCP] = STATE_INITIAL; 2321 sp->fail_counter[IDX_LCP] = 0; 2322 sp->pp_seq[IDX_LCP] = 0; 2323 sp->pp_rseq[IDX_LCP] = 0; 2324 sp->lcp.protos = 0; 2325 2326 /* 2327 * Initialize counters and timeout values. Note that we don't 2328 * use the 3 seconds suggested in RFC 1661 since we are likely 2329 * running on a fast link. XXX We should probably implement 2330 * the exponential backoff option. Note that these values are 2331 * relevant for all control protocols, not just LCP only. 2332 */ 2333 sp->lcp.timeout = 1 * hz; 2334 sp->lcp.max_terminate = 2; 2335 sp->lcp.max_configure = 10; 2336 sp->lcp.max_failure = 10; 2337 callout_init(&sp->ch[IDX_LCP], CALLOUT_MPSAFE); 2338 } 2339 2340 static void 2341 sppp_lcp_up(struct sppp *sp) 2342 { 2343 STDDCL; 2344 2345 KASSERT(SPPP_WLOCKED(sp)); 2346 2347 /* Initialize activity timestamp: opening a connection is an activity */ 2348 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2349 2350 /* Initialize mlppp state */ 2351 sp->lcp.mrru = sp->lcp.their_mrru = 0; 2352 sp->lcp.ml_prefix = NULL; 2353 sp->lcp.ml_seq_xpctd = 0; 2354 2355 /* 2356 * If this interface is passive or dial-on-demand, and we are 2357 * still in Initial state, it means we've got an incoming 2358 * call. Activate the interface. 2359 */ 2360 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2361 if (debug) 2362 log(LOG_DEBUG, 2363 "%s: Up event", ifp->if_xname); 2364 ifp->if_flags |= IFF_RUNNING; 2365 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2366 if (debug) 2367 addlog("(incoming call)\n"); 2368 sp->pp_flags |= PP_CALLIN; 2369 lcp.Open(sp); 2370 } else if (debug) 2371 addlog("\n"); 2372 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2373 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2374 ifp->if_flags |= IFF_RUNNING; 2375 lcp.Open(sp); 2376 } 2377 2378 sppp_up_event(&lcp, sp); 2379 } 2380 2381 static void 2382 sppp_lcp_down(struct sppp *sp) 2383 { 2384 STDDCL; 2385 2386 KASSERT(SPPP_WLOCKED(sp)); 2387 2388 sppp_down_event(&lcp, sp); 2389 2390 /* 2391 * If this is neither a dial-on-demand nor a passive 2392 * interface, simulate an ``ifconfig down'' action, so the 2393 * administrator can force a redial by another ``ifconfig 2394 * up''. XXX For leased line operation, should we immediately 2395 * try to reopen the connection here? 2396 */ 2397 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2398 if (debug) 2399 log(LOG_INFO, 2400 "%s: Down event (carrier loss), taking interface down.\n", 2401 ifp->if_xname); 2402 SPPP_UNLOCK(sp); 2403 if_down(ifp); 2404 SPPP_LOCK(sp, RW_WRITER); 2405 } else { 2406 if (debug) 2407 log(LOG_DEBUG, 2408 "%s: Down event (carrier loss)\n", 2409 ifp->if_xname); 2410 } 2411 sp->fail_counter[IDX_LCP] = 0; 2412 sp->pp_flags &= ~PP_CALLIN; 2413 if (sp->state[IDX_LCP] != STATE_INITIAL) 2414 lcp.Close(sp); 2415 ifp->if_flags &= ~IFF_RUNNING; 2416 } 2417 2418 static void 2419 sppp_lcp_open(struct sppp *sp) 2420 { 2421 2422 KASSERT(SPPP_WLOCKED(sp)); 2423 2424 if (sp->pp_if.if_mtu < PP_MTU) { 2425 sp->lcp.mru = sp->pp_if.if_mtu; 2426 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2427 } else 2428 sp->lcp.mru = PP_MTU; 2429 sp->lcp.their_mru = PP_MTU; 2430 2431 /* 2432 * If we are authenticator, negotiate LCP_AUTH 2433 */ 2434 if (sp->hisauth.proto != 0) 2435 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2436 else 2437 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2438 sp->pp_flags &= ~PP_NEEDAUTH; 2439 sppp_open_event(&lcp, sp); 2440 } 2441 2442 static void 2443 sppp_lcp_close(struct sppp *sp) 2444 { 2445 2446 KASSERT(SPPP_WLOCKED(sp)); 2447 sppp_close_event(&lcp, sp); 2448 } 2449 2450 static void 2451 sppp_lcp_TO(void *cookie) 2452 { 2453 struct sppp *sp = (struct sppp*)cookie; 2454 2455 SPPP_LOCK(sp, RW_WRITER); 2456 sppp_to_event(&lcp, sp); 2457 SPPP_UNLOCK(sp); 2458 } 2459 2460 /* 2461 * Analyze a configure request. Return true if it was agreeable, and 2462 * caused action sca, false if it has been rejected or nak'ed, and 2463 * caused action scn. (The return value is used to make the state 2464 * transition decision in the state automaton.) 2465 */ 2466 static int 2467 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2468 { 2469 STDDCL; 2470 u_char *buf, *r, *p, l, blen; 2471 int origlen, rlen; 2472 uint32_t nmagic; 2473 u_short authproto; 2474 2475 KASSERT(SPPP_WLOCKED(sp)); 2476 2477 len -= 4; 2478 origlen = len; 2479 buf = r = malloc (blen = len, M_TEMP, M_NOWAIT); 2480 if (! buf) 2481 return (0); 2482 2483 if (debug) 2484 log(LOG_DEBUG, "%s: lcp parse opts:", 2485 ifp->if_xname); 2486 2487 /* pass 1: check for things that need to be rejected */ 2488 p = (void *)(h + 1); 2489 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2490 /* Sanity check option length */ 2491 if (l > len) { 2492 /* 2493 * Malicious option - drop immediately. 2494 * XXX Maybe we should just RXJ it? 2495 */ 2496 addlog("%s: received malicious LCP option 0x%02x, " 2497 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2498 p[0], l, len); 2499 goto drop; 2500 } 2501 if (debug) 2502 addlog(" %s", sppp_lcp_opt_name(*p)); 2503 switch (*p) { 2504 case LCP_OPT_MAGIC: 2505 /* Magic number. */ 2506 /* fall through, both are same length */ 2507 case LCP_OPT_ASYNC_MAP: 2508 /* Async control character map. */ 2509 if (len >= 6 || l == 6) 2510 continue; 2511 if (debug) 2512 addlog(" [invalid]"); 2513 break; 2514 case LCP_OPT_MP_EID: 2515 if (len >= l && l >= 3) { 2516 switch (p[2]) { 2517 case 0: if (l==3+ 0) continue;break; 2518 case 2: if (l==3+ 4) continue;break; 2519 case 3: if (l==3+ 6) continue;break; 2520 case 6: if (l==3+16) continue;break; 2521 case 1: /* FALLTHROUGH */ 2522 case 4: if (l<=3+20) continue;break; 2523 case 5: if (l<=3+15) continue;break; 2524 /* XXX should it be default: continue;? */ 2525 } 2526 } 2527 if (debug) 2528 addlog(" [invalid class %d len %d]", p[2], l); 2529 break; 2530 case LCP_OPT_MP_SSNHF: 2531 if (len >= 2 && l == 2) { 2532 if (debug) 2533 addlog(" [rej]"); 2534 break; 2535 } 2536 if (debug) 2537 addlog(" [invalid]"); 2538 break; 2539 case LCP_OPT_MP_MRRU: 2540 /* Multilink maximum received reconstructed unit */ 2541 /* should be fall through, both are same length */ 2542 /* FALLTHROUGH */ 2543 case LCP_OPT_MRU: 2544 /* Maximum receive unit. */ 2545 if (len >= 4 && l == 4) 2546 continue; 2547 if (debug) 2548 addlog(" [invalid]"); 2549 break; 2550 case LCP_OPT_AUTH_PROTO: 2551 if (len < 4) { 2552 if (debug) 2553 addlog(" [invalid]"); 2554 break; 2555 } 2556 authproto = (p[2] << 8) + p[3]; 2557 if (authproto == PPP_CHAP && l != 5) { 2558 if (debug) 2559 addlog(" [invalid chap len]"); 2560 break; 2561 } 2562 if (sp->myauth.proto == 0) { 2563 /* we are not configured to do auth */ 2564 if (debug) 2565 addlog(" [not configured]"); 2566 break; 2567 } 2568 /* 2569 * Remote want us to authenticate, remember this, 2570 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2571 * up. 2572 */ 2573 sp->pp_flags |= PP_NEEDAUTH; 2574 continue; 2575 default: 2576 /* Others not supported. */ 2577 if (debug) 2578 addlog(" [rej]"); 2579 break; 2580 } 2581 if (rlen + l > blen) { 2582 if (debug) 2583 addlog(" [overflow]"); 2584 continue; 2585 } 2586 /* Add the option to rejected list. */ 2587 memcpy(r, p, l); 2588 r += l; 2589 rlen += l; 2590 } 2591 if (rlen) { 2592 if (debug) 2593 addlog(" send conf-rej\n"); 2594 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2595 goto end; 2596 } else if (debug) 2597 addlog("\n"); 2598 2599 /* 2600 * pass 2: check for option values that are unacceptable and 2601 * thus require to be nak'ed. 2602 */ 2603 if (debug) 2604 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2605 ifp->if_xname); 2606 2607 p = (void *)(h + 1); 2608 len = origlen; 2609 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2610 if (debug) 2611 addlog(" %s", sppp_lcp_opt_name(*p)); 2612 switch (*p) { 2613 case LCP_OPT_MAGIC: 2614 /* Magic number -- extract. */ 2615 nmagic = (uint32_t)p[2] << 24 | 2616 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2617 if (nmagic != sp->lcp.magic) { 2618 if (debug) 2619 addlog(" 0x%x", nmagic); 2620 continue; 2621 } 2622 /* 2623 * Local and remote magics equal -- loopback? 2624 */ 2625 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2626 printf ("%s: loopback\n", 2627 ifp->if_xname); 2628 sp->pp_loopcnt = 0; 2629 if (ifp->if_flags & IFF_UP) { 2630 SPPP_UNLOCK(sp); 2631 if_down(ifp); 2632 SPPP_LOCK(sp, RW_WRITER); 2633 2634 IF_PURGE(&sp->pp_cpq); 2635 /* XXX ? */ 2636 lcp.Down(sp); 2637 lcp.Up(sp); 2638 } 2639 } else if (debug) 2640 addlog(" [glitch]"); 2641 ++sp->pp_loopcnt; 2642 /* 2643 * We negate our magic here, and NAK it. If 2644 * we see it later in an NAK packet, we 2645 * suggest a new one. 2646 */ 2647 nmagic = ~sp->lcp.magic; 2648 /* Gonna NAK it. */ 2649 p[2] = nmagic >> 24; 2650 p[3] = nmagic >> 16; 2651 p[4] = nmagic >> 8; 2652 p[5] = nmagic; 2653 break; 2654 2655 case LCP_OPT_ASYNC_MAP: 2656 /* 2657 * Async control character map -- just ignore it. 2658 * 2659 * Quote from RFC 1662, chapter 6: 2660 * To enable this functionality, synchronous PPP 2661 * implementations MUST always respond to the 2662 * Async-Control-Character-Map Configuration 2663 * Option with the LCP Configure-Ack. However, 2664 * acceptance of the Configuration Option does 2665 * not imply that the synchronous implementation 2666 * will do any ACCM mapping. Instead, all such 2667 * octet mapping will be performed by the 2668 * asynchronous-to-synchronous converter. 2669 */ 2670 continue; 2671 2672 case LCP_OPT_MRU: 2673 /* 2674 * Maximum receive unit. Always agreeable, 2675 * but ignored by now. 2676 */ 2677 sp->lcp.their_mru = p[2] * 256 + p[3]; 2678 if (debug) 2679 addlog(" %ld", sp->lcp.their_mru); 2680 continue; 2681 2682 case LCP_OPT_AUTH_PROTO: 2683 authproto = (p[2] << 8) + p[3]; 2684 if (sp->myauth.proto != authproto) { 2685 /* not agreed, nak */ 2686 if (debug) 2687 addlog(" [mine %s != his %s]", 2688 sppp_proto_name(sp->myauth.proto), 2689 sppp_proto_name(authproto)); 2690 p[2] = sp->myauth.proto >> 8; 2691 p[3] = sp->myauth.proto; 2692 break; 2693 } 2694 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2695 if (debug) 2696 addlog(" [chap not MD5]"); 2697 p[4] = CHAP_MD5; 2698 break; 2699 } 2700 continue; 2701 case LCP_OPT_MP_EID: 2702 /* 2703 * Endpoint identification. 2704 * Always agreeable, 2705 * but ignored by now. 2706 */ 2707 if (debug) { 2708 addlog(" class %d", p[2]); 2709 sppp_print_bytes(p+3, p[1]-3); 2710 } 2711 continue; 2712 case LCP_OPT_MP_MRRU: 2713 /* 2714 * Maximum received reconstructed unit. 2715 * Always agreeable, 2716 * but ignored by now. 2717 */ 2718 sp->lcp.their_mrru = p[2] * 256 + p[3]; 2719 if (debug) 2720 addlog(" %ld", sp->lcp.their_mrru); 2721 continue; 2722 } 2723 if (rlen + l > blen) { 2724 if (debug) 2725 addlog(" [overflow]"); 2726 continue; 2727 } 2728 /* Add the option to nak'ed list. */ 2729 memcpy(r, p, l); 2730 r += l; 2731 rlen += l; 2732 } 2733 if (rlen) { 2734 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2735 if (debug) 2736 addlog(" max_failure (%d) exceeded, " 2737 "send conf-rej\n", 2738 sp->lcp.max_failure); 2739 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2740 } else { 2741 if (debug) 2742 addlog(" send conf-nak\n"); 2743 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2744 } 2745 goto end; 2746 } else { 2747 if (debug) 2748 addlog(" send conf-ack\n"); 2749 sp->fail_counter[IDX_LCP] = 0; 2750 sp->pp_loopcnt = 0; 2751 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2752 } 2753 2754 end: 2755 free(buf, M_TEMP); 2756 return (rlen == 0); 2757 2758 drop: 2759 free(buf, M_TEMP); 2760 return -1; 2761 } 2762 2763 /* 2764 * Analyze the LCP Configure-Reject option list, and adjust our 2765 * negotiation. 2766 */ 2767 static void 2768 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2769 { 2770 STDDCL; 2771 u_char *buf, *p, l; 2772 2773 KASSERT(SPPP_WLOCKED(sp)); 2774 2775 len -= 4; 2776 buf = malloc (len, M_TEMP, M_NOWAIT); 2777 if (!buf) 2778 return; 2779 2780 if (debug) 2781 log(LOG_DEBUG, "%s: lcp rej opts:", 2782 ifp->if_xname); 2783 2784 p = (void *)(h + 1); 2785 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2786 /* Sanity check option length */ 2787 if (l > len) { 2788 /* 2789 * Malicious option - drop immediately. 2790 * XXX Maybe we should just RXJ it? 2791 */ 2792 addlog("%s: received malicious LCP option, " 2793 "dropping.\n", ifp->if_xname); 2794 goto drop; 2795 } 2796 if (debug) 2797 addlog(" %s", sppp_lcp_opt_name(*p)); 2798 switch (*p) { 2799 case LCP_OPT_MAGIC: 2800 /* Magic number -- can't use it, use 0 */ 2801 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2802 sp->lcp.magic = 0; 2803 break; 2804 case LCP_OPT_MRU: 2805 /* 2806 * We try to negotiate a lower MRU if the underlying 2807 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2808 * peer rejects this lower rate, fallback to the 2809 * default. 2810 */ 2811 if (debug) { 2812 addlog("%s: warning: peer rejected our MRU of " 2813 "%ld bytes. Defaulting to %d bytes\n", 2814 ifp->if_xname, sp->lcp.mru, PP_MTU); 2815 } 2816 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2817 sp->lcp.mru = PP_MTU; 2818 break; 2819 case LCP_OPT_AUTH_PROTO: 2820 /* 2821 * Peer doesn't want to authenticate himself, 2822 * deny unless this is a dialout call, and 2823 * SPPP_AUTHFLAG_NOCALLOUT is set. 2824 */ 2825 if ((sp->pp_flags & PP_CALLIN) == 0 && 2826 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2827 if (debug) 2828 addlog(" [don't insist on auth " 2829 "for callout]"); 2830 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2831 break; 2832 } 2833 if (debug) 2834 addlog("[access denied]\n"); 2835 lcp.Close(sp); 2836 break; 2837 } 2838 } 2839 if (debug) 2840 addlog("\n"); 2841 drop: 2842 free(buf, M_TEMP); 2843 return; 2844 } 2845 2846 /* 2847 * Analyze the LCP Configure-NAK option list, and adjust our 2848 * negotiation. 2849 */ 2850 static void 2851 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2852 { 2853 STDDCL; 2854 u_char *buf, *p, l, blen; 2855 uint32_t magic; 2856 2857 KASSERT(SPPP_WLOCKED(sp)); 2858 2859 len -= 4; 2860 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 2861 if (!buf) 2862 return; 2863 2864 if (debug) 2865 log(LOG_DEBUG, "%s: lcp nak opts:", 2866 ifp->if_xname); 2867 2868 p = (void *)(h + 1); 2869 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2870 /* Sanity check option length */ 2871 if (l > len) { 2872 /* 2873 * Malicious option - drop immediately. 2874 * XXX Maybe we should just RXJ it? 2875 */ 2876 addlog("%s: received malicious LCP option, " 2877 "dropping.\n", ifp->if_xname); 2878 goto drop; 2879 } 2880 if (debug) 2881 addlog(" %s", sppp_lcp_opt_name(*p)); 2882 switch (*p) { 2883 case LCP_OPT_MAGIC: 2884 /* Magic number -- renegotiate */ 2885 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2886 len >= 6 && l == 6) { 2887 magic = (uint32_t)p[2] << 24 | 2888 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2889 /* 2890 * If the remote magic is our negated one, 2891 * this looks like a loopback problem. 2892 * Suggest a new magic to make sure. 2893 */ 2894 if (magic == ~sp->lcp.magic) { 2895 if (debug) 2896 addlog(" magic glitch"); 2897 sp->lcp.magic = cprng_fast32(); 2898 } else { 2899 sp->lcp.magic = magic; 2900 if (debug) 2901 addlog(" %d", magic); 2902 } 2903 } 2904 break; 2905 case LCP_OPT_MRU: 2906 /* 2907 * Peer wants to advise us to negotiate an MRU. 2908 * Agree on it if it's reasonable, or use 2909 * default otherwise. 2910 */ 2911 if (len >= 4 && l == 4) { 2912 u_int mru = p[2] * 256 + p[3]; 2913 if (debug) 2914 addlog(" %d", mru); 2915 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2916 mru = sp->pp_if.if_mtu; 2917 sp->lcp.mru = mru; 2918 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2919 } 2920 break; 2921 case LCP_OPT_AUTH_PROTO: 2922 /* 2923 * Peer doesn't like our authentication method, 2924 * deny. 2925 */ 2926 if (debug) 2927 addlog("[access denied]\n"); 2928 lcp.Close(sp); 2929 break; 2930 } 2931 } 2932 if (debug) 2933 addlog("\n"); 2934 drop: 2935 free(buf, M_TEMP); 2936 return; 2937 } 2938 2939 static void 2940 sppp_lcp_tlu(struct sppp *sp) 2941 { 2942 struct ifnet *ifp = &sp->pp_if; 2943 int i; 2944 uint32_t mask; 2945 2946 KASSERT(SPPP_WLOCKED(sp)); 2947 2948 /* XXX ? */ 2949 if (! (ifp->if_flags & IFF_UP) && 2950 (ifp->if_flags & IFF_RUNNING)) { 2951 /* Coming out of loopback mode. */ 2952 SPPP_UNLOCK(sp); 2953 if_up(ifp); 2954 SPPP_LOCK(sp, RW_WRITER); 2955 } 2956 2957 for (i = 0; i < IDX_COUNT; i++) 2958 if ((cps[i])->flags & CP_QUAL) 2959 (cps[i])->Open(sp); 2960 2961 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2962 (sp->pp_flags & PP_NEEDAUTH) != 0) 2963 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 2964 else 2965 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 2966 2967 /* 2968 * Open all authentication protocols. This is even required 2969 * if we already proceeded to network phase, since it might be 2970 * that remote wants us to authenticate, so we might have to 2971 * send a PAP request. Undesired authentication protocols 2972 * don't do anything when they get an Open event. 2973 */ 2974 for (i = 0; i < IDX_COUNT; i++) 2975 if ((cps[i])->flags & CP_AUTH) 2976 (cps[i])->Open(sp); 2977 2978 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2979 /* Notify all NCPs. */ 2980 for (i = 0; i < IDX_COUNT; i++) 2981 if ((cps[i])->flags & CP_NCP) 2982 (cps[i])->Open(sp); 2983 } 2984 2985 /* Send Up events to all started protos. */ 2986 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) { 2987 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2988 (cps[i])->Up(sp); 2989 } 2990 } 2991 2992 /* notify low-level driver of state change */ 2993 sppp_notify_chg_wlocked(sp); 2994 2995 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2996 /* if no NCP is starting, close down */ 2997 sppp_lcp_check_and_close(sp); 2998 } 2999 3000 static void 3001 sppp_lcp_tld(struct sppp *sp) 3002 { 3003 int i; 3004 uint32_t mask; 3005 3006 KASSERT(SPPP_WLOCKED(sp)); 3007 3008 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 3009 3010 /* 3011 * Take upper layers down. We send the Down event first and 3012 * the Close second to prevent the upper layers from sending 3013 * ``a flurry of terminate-request packets'', as the RFC 3014 * describes it. 3015 */ 3016 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) { 3017 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 3018 (cps[i])->Down(sp); 3019 (cps[i])->Close(sp); 3020 } 3021 } 3022 } 3023 3024 static void 3025 sppp_lcp_tls(struct sppp *sp) 3026 { 3027 3028 KASSERT(SPPP_WLOCKED(sp)); 3029 3030 3031 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 3032 printf("%s: authentication failed %d times, not retrying again\n", 3033 sp->pp_if.if_xname, sp->pp_auth_failures); 3034 3035 SPPP_UNLOCK(sp); 3036 if_down(&sp->pp_if); 3037 SPPP_LOCK(sp, RW_WRITER); 3038 return; 3039 } 3040 3041 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 3042 3043 /* Notify lower layer if desired. */ 3044 sppp_notify_tls_wlocked(sp); 3045 } 3046 3047 static void 3048 sppp_lcp_tlf(struct sppp *sp) 3049 { 3050 3051 KASSERT(SPPP_WLOCKED(sp)); 3052 3053 sppp_change_phase(sp, SPPP_PHASE_DEAD); 3054 3055 /* Notify lower layer if desired. */ 3056 sppp_notify_tlf_wlocked(sp); 3057 } 3058 3059 static void 3060 sppp_lcp_scr(struct sppp *sp) 3061 { 3062 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 3063 int i = 0; 3064 u_short authproto; 3065 3066 KASSERT(SPPP_WLOCKED(sp)); 3067 3068 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 3069 if (! sp->lcp.magic) 3070 sp->lcp.magic = cprng_fast32(); 3071 opt[i++] = LCP_OPT_MAGIC; 3072 opt[i++] = 6; 3073 opt[i++] = sp->lcp.magic >> 24; 3074 opt[i++] = sp->lcp.magic >> 16; 3075 opt[i++] = sp->lcp.magic >> 8; 3076 opt[i++] = sp->lcp.magic; 3077 } 3078 3079 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 3080 opt[i++] = LCP_OPT_MRU; 3081 opt[i++] = 4; 3082 opt[i++] = sp->lcp.mru >> 8; 3083 opt[i++] = sp->lcp.mru; 3084 } 3085 3086 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 3087 authproto = sp->hisauth.proto; 3088 opt[i++] = LCP_OPT_AUTH_PROTO; 3089 opt[i++] = authproto == PPP_CHAP? 5: 4; 3090 opt[i++] = authproto >> 8; 3091 opt[i++] = authproto; 3092 if (authproto == PPP_CHAP) 3093 opt[i++] = CHAP_MD5; 3094 } 3095 3096 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 3097 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 3098 } 3099 3100 /* 3101 * Check the open NCPs, return true if at least one NCP is open. 3102 */ 3103 static int 3104 sppp_ncp_check(struct sppp *sp) 3105 { 3106 int i, mask; 3107 3108 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 3109 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 3110 return 1; 3111 return 0; 3112 } 3113 3114 /* 3115 * Re-check the open NCPs and see if we should terminate the link. 3116 * Called by the NCPs during their tlf action handling. 3117 */ 3118 static void 3119 sppp_lcp_check_and_close(struct sppp *sp) 3120 { 3121 3122 KASSERT(SPPP_WLOCKED(sp)); 3123 3124 if (sp->pp_phase < SPPP_PHASE_NETWORK) 3125 /* don't bother, we are already going down */ 3126 return; 3127 3128 if (sppp_ncp_check(sp)) 3129 return; 3130 lcp.Close(sp); 3131 } 3132 3133 3134 /* 3135 *--------------------------------------------------------------------------* 3136 * * 3137 * The IPCP implementation. * 3138 * * 3139 *--------------------------------------------------------------------------* 3140 */ 3141 3142 static void 3143 sppp_ipcp_init(struct sppp *sp) 3144 { 3145 int error; 3146 3147 KASSERT(SPPP_WLOCKED(sp)); 3148 3149 sp->ipcp.opts = 0; 3150 sp->ipcp.flags = 0; 3151 sp->state[IDX_IPCP] = STATE_INITIAL; 3152 sp->fail_counter[IDX_IPCP] = 0; 3153 sp->pp_seq[IDX_IPCP] = 0; 3154 sp->pp_rseq[IDX_IPCP] = 0; 3155 callout_init(&sp->ch[IDX_IPCP], CALLOUT_MPSAFE); 3156 3157 error = workqueue_create(&sp->ipcp.update_addrs_wq, "ipcp_addr", 3158 sppp_update_ip_addrs_work, sp, PRI_SOFTNET, IPL_NET, 0); 3159 if (error) 3160 panic("%s: update_addrs workqueue_create failed (%d)\n", 3161 __func__, error); 3162 sp->ipcp.update_addrs_q = pcq_create(IPCP_UPDATE_LIMIT, KM_SLEEP); 3163 3164 sp->ipcp.update_addrs_enqueued = 0; 3165 } 3166 3167 static void 3168 sppp_ipcp_up(struct sppp *sp) 3169 { 3170 KASSERT(SPPP_WLOCKED(sp)); 3171 sppp_up_event(&ipcp, sp); 3172 } 3173 3174 static void 3175 sppp_ipcp_down(struct sppp *sp) 3176 { 3177 KASSERT(SPPP_WLOCKED(sp)); 3178 sppp_down_event(&ipcp, sp); 3179 } 3180 3181 static void 3182 sppp_ipcp_open(struct sppp *sp) 3183 { 3184 STDDCL; 3185 uint32_t myaddr, hisaddr; 3186 3187 KASSERT(SPPP_WLOCKED(sp)); 3188 3189 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 3190 sp->ipcp.req_myaddr = 0; 3191 sp->ipcp.req_hisaddr = 0; 3192 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 3193 3194 #ifdef INET 3195 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3196 #else 3197 myaddr = hisaddr = 0; 3198 #endif 3199 /* 3200 * If we don't have his address, this probably means our 3201 * interface doesn't want to talk IP at all. (This could 3202 * be the case if somebody wants to speak only IPX, for 3203 * example.) Don't open IPCP in this case. 3204 */ 3205 if (hisaddr == 0) { 3206 /* XXX this message should go away */ 3207 if (debug) 3208 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 3209 ifp->if_xname); 3210 return; 3211 } 3212 3213 if (myaddr == 0) { 3214 /* 3215 * I don't have an assigned address, so i need to 3216 * negotiate my address. 3217 */ 3218 sp->ipcp.flags |= IPCP_MYADDR_DYN; 3219 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3220 } 3221 if (hisaddr == 1) { 3222 /* 3223 * XXX - remove this hack! 3224 * remote has no valid address, we need to get one assigned. 3225 */ 3226 sp->ipcp.flags |= IPCP_HISADDR_DYN; 3227 } 3228 sppp_open_event(&ipcp, sp); 3229 } 3230 3231 static void 3232 sppp_ipcp_close(struct sppp *sp) 3233 { 3234 3235 KASSERT(SPPP_WLOCKED(sp)); 3236 3237 sppp_close_event(&ipcp, sp); 3238 3239 #ifdef INET 3240 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 3241 /* 3242 * Some address was dynamic, clear it again. 3243 */ 3244 sppp_clear_ip_addrs(sp); 3245 #endif 3246 } 3247 3248 static void 3249 sppp_ipcp_TO(void *cookie) 3250 { 3251 struct sppp *sp = cookie; 3252 3253 SPPP_LOCK(sp, RW_WRITER); 3254 sppp_to_event(&ipcp, sp); 3255 SPPP_UNLOCK(sp); 3256 } 3257 3258 /* 3259 * Analyze a configure request. Return true if it was agreeable, and 3260 * caused action sca, false if it has been rejected or nak'ed, and 3261 * caused action scn. (The return value is used to make the state 3262 * transition decision in the state automaton.) 3263 */ 3264 static int 3265 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3266 { 3267 u_char *buf, *r, *p, l, blen; 3268 struct ifnet *ifp = &sp->pp_if; 3269 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3270 uint32_t hisaddr, desiredaddr; 3271 3272 KASSERT(SPPP_WLOCKED(sp)); 3273 3274 len -= 4; 3275 origlen = len; 3276 /* 3277 * Make sure to allocate a buf that can at least hold a 3278 * conf-nak with an `address' option. We might need it below. 3279 */ 3280 blen = len < 6 ? 6 : len; 3281 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 3282 if (! buf) 3283 return (0); 3284 3285 /* pass 1: see if we can recognize them */ 3286 if (debug) 3287 log(LOG_DEBUG, "%s: ipcp parse opts:", 3288 ifp->if_xname); 3289 p = (void *)(h + 1); 3290 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3291 /* Sanity check option length */ 3292 if (l > len) { 3293 /* XXX should we just RXJ? */ 3294 addlog("%s: malicious IPCP option received, dropping\n", 3295 ifp->if_xname); 3296 goto drop; 3297 } 3298 if (debug) 3299 addlog(" %s", sppp_ipcp_opt_name(*p)); 3300 switch (*p) { 3301 #ifdef notyet 3302 case IPCP_OPT_COMPRESSION: 3303 if (len >= 6 && l >= 6) { 3304 /* correctly formed compress option */ 3305 continue; 3306 } 3307 if (debug) 3308 addlog(" [invalid]"); 3309 break; 3310 #endif 3311 case IPCP_OPT_ADDRESS: 3312 if (len >= 6 && l == 6) { 3313 /* correctly formed address option */ 3314 continue; 3315 } 3316 if (debug) 3317 addlog(" [invalid]"); 3318 break; 3319 default: 3320 /* Others not supported. */ 3321 if (debug) 3322 addlog(" [rej]"); 3323 break; 3324 } 3325 /* Add the option to rejected list. */ 3326 if (rlen + l > blen) { 3327 if (debug) 3328 addlog(" [overflow]"); 3329 continue; 3330 } 3331 memcpy(r, p, l); 3332 r += l; 3333 rlen += l; 3334 } 3335 if (rlen) { 3336 if (debug) 3337 addlog(" send conf-rej\n"); 3338 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 3339 goto end; 3340 } else if (debug) 3341 addlog("\n"); 3342 3343 /* pass 2: parse option values */ 3344 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 3345 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 3346 else 3347 #ifdef INET 3348 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 3349 #else 3350 hisaddr = 0; 3351 #endif 3352 if (debug) 3353 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 3354 ifp->if_xname); 3355 p = (void *)(h + 1); 3356 len = origlen; 3357 for (rlen=0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3358 if (debug) 3359 addlog(" %s", sppp_ipcp_opt_name(*p)); 3360 switch (*p) { 3361 #ifdef notyet 3362 case IPCP_OPT_COMPRESSION: 3363 continue; 3364 #endif 3365 case IPCP_OPT_ADDRESS: 3366 desiredaddr = p[2] << 24 | p[3] << 16 | 3367 p[4] << 8 | p[5]; 3368 if (desiredaddr == hisaddr || 3369 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 3370 /* 3371 * Peer's address is same as our value, 3372 * this is agreeable. Gonna conf-ack 3373 * it. 3374 */ 3375 if (debug) 3376 addlog(" %s [ack]", 3377 sppp_dotted_quad(hisaddr)); 3378 /* record that we've seen it already */ 3379 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3380 sp->ipcp.req_hisaddr = desiredaddr; 3381 hisaddr = desiredaddr; 3382 continue; 3383 } 3384 /* 3385 * The address wasn't agreeable. This is either 3386 * he sent us 0.0.0.0, asking to assign him an 3387 * address, or he send us another address not 3388 * matching our value. Either case, we gonna 3389 * conf-nak it with our value. 3390 */ 3391 if (debug) { 3392 if (desiredaddr == 0) 3393 addlog(" [addr requested]"); 3394 else 3395 addlog(" %s [not agreed]", 3396 sppp_dotted_quad(desiredaddr)); 3397 } 3398 3399 p[2] = hisaddr >> 24; 3400 p[3] = hisaddr >> 16; 3401 p[4] = hisaddr >> 8; 3402 p[5] = hisaddr; 3403 break; 3404 } 3405 if (rlen + l > blen) { 3406 if (debug) 3407 addlog(" [overflow]"); 3408 continue; 3409 } 3410 /* Add the option to nak'ed list. */ 3411 memcpy(r, p, l); 3412 r += l; 3413 rlen += l; 3414 } 3415 3416 /* 3417 * If we are about to conf-ack the request, but haven't seen 3418 * his address so far, gonna conf-nak it instead, with the 3419 * `address' option present and our idea of his address being 3420 * filled in there, to request negotiation of both addresses. 3421 * 3422 * XXX This can result in an endless req - nak loop if peer 3423 * doesn't want to send us his address. Q: What should we do 3424 * about it? XXX A: implement the max-failure counter. 3425 */ 3426 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 3427 buf[0] = IPCP_OPT_ADDRESS; 3428 buf[1] = 6; 3429 buf[2] = hisaddr >> 24; 3430 buf[3] = hisaddr >> 16; 3431 buf[4] = hisaddr >> 8; 3432 buf[5] = hisaddr; 3433 rlen = 6; 3434 if (debug) 3435 addlog(" still need hisaddr"); 3436 } 3437 3438 if (rlen) { 3439 if (debug) 3440 addlog(" send conf-nak\n"); 3441 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3442 } else { 3443 if (debug) 3444 addlog(" send conf-ack\n"); 3445 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3446 } 3447 3448 end: 3449 free(buf, M_TEMP); 3450 return (rlen == 0); 3451 3452 drop: 3453 free(buf, M_TEMP); 3454 return -1; 3455 } 3456 3457 /* 3458 * Analyze the IPCP Configure-Reject option list, and adjust our 3459 * negotiation. 3460 */ 3461 static void 3462 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3463 { 3464 u_char *buf, *p, l, blen; 3465 struct ifnet *ifp = &sp->pp_if; 3466 int debug = ifp->if_flags & IFF_DEBUG; 3467 3468 KASSERT(SPPP_WLOCKED(sp)); 3469 3470 len -= 4; 3471 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3472 if (!buf) 3473 return; 3474 3475 if (debug) 3476 log(LOG_DEBUG, "%s: ipcp rej opts:", 3477 ifp->if_xname); 3478 3479 p = (void *)(h + 1); 3480 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3481 /* Sanity check option length */ 3482 if (l > len) { 3483 /* XXX should we just RXJ? */ 3484 addlog("%s: malicious IPCP option received, dropping\n", 3485 ifp->if_xname); 3486 goto drop; 3487 } 3488 if (debug) 3489 addlog(" %s", sppp_ipcp_opt_name(*p)); 3490 switch (*p) { 3491 case IPCP_OPT_ADDRESS: 3492 /* 3493 * Peer doesn't grok address option. This is 3494 * bad. XXX Should we better give up here? 3495 */ 3496 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3497 break; 3498 #ifdef notyet 3499 case IPCP_OPT_COMPRESS: 3500 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3501 break; 3502 #endif 3503 } 3504 } 3505 if (debug) 3506 addlog("\n"); 3507 drop: 3508 free(buf, M_TEMP); 3509 return; 3510 } 3511 3512 /* 3513 * Analyze the IPCP Configure-NAK option list, and adjust our 3514 * negotiation. 3515 */ 3516 static void 3517 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3518 { 3519 u_char *p, l; 3520 struct ifnet *ifp = &sp->pp_if; 3521 int debug = ifp->if_flags & IFF_DEBUG; 3522 uint32_t wantaddr; 3523 3524 KASSERT(SPPP_WLOCKED(sp)); 3525 3526 len -= 4; 3527 3528 if (debug) 3529 log(LOG_DEBUG, "%s: ipcp nak opts:", 3530 ifp->if_xname); 3531 3532 p = (void *)(h + 1); 3533 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3534 /* Sanity check option length */ 3535 if (l > len) { 3536 /* XXX should we just RXJ? */ 3537 addlog("%s: malicious IPCP option received, dropping\n", 3538 ifp->if_xname); 3539 return; 3540 } 3541 if (debug) 3542 addlog(" %s", sppp_ipcp_opt_name(*p)); 3543 switch (*p) { 3544 case IPCP_OPT_ADDRESS: 3545 /* 3546 * Peer doesn't like our local IP address. See 3547 * if we can do something for him. We'll drop 3548 * him our address then. 3549 */ 3550 if (len >= 6 && l == 6) { 3551 wantaddr = p[2] << 24 | p[3] << 16 | 3552 p[4] << 8 | p[5]; 3553 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3554 if (debug) 3555 addlog(" [wantaddr %s]", 3556 sppp_dotted_quad(wantaddr)); 3557 /* 3558 * When doing dynamic address assignment, 3559 * we accept his offer. Otherwise, we 3560 * ignore it and thus continue to negotiate 3561 * our already existing value. 3562 */ 3563 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3564 if (debug) 3565 addlog(" [agree]"); 3566 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3567 sp->ipcp.req_myaddr = wantaddr; 3568 } 3569 } 3570 break; 3571 3572 case IPCP_OPT_PRIMDNS: 3573 if (len >= 6 && l == 6) { 3574 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3575 p[4] << 8 | p[5]; 3576 } 3577 break; 3578 3579 case IPCP_OPT_SECDNS: 3580 if (len >= 6 && l == 6) { 3581 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3582 p[4] << 8 | p[5]; 3583 } 3584 break; 3585 #ifdef notyet 3586 case IPCP_OPT_COMPRESS: 3587 /* 3588 * Peer wants different compression parameters. 3589 */ 3590 break; 3591 #endif 3592 } 3593 } 3594 if (debug) 3595 addlog("\n"); 3596 } 3597 3598 static void 3599 sppp_ipcp_tlu(struct sppp *sp) 3600 { 3601 #ifdef INET 3602 KASSERT(SPPP_WLOCKED(sp)); 3603 /* we are up. Set addresses and notify anyone interested */ 3604 sppp_set_ip_addrs(sp); 3605 #endif 3606 } 3607 3608 static void 3609 sppp_ipcp_tld(struct sppp *sp) 3610 { 3611 3612 KASSERT(SPPP_WLOCKED(sp)); 3613 } 3614 3615 static void 3616 sppp_ipcp_tls(struct sppp *sp) 3617 { 3618 3619 KASSERT(SPPP_WLOCKED(sp)); 3620 /* indicate to LCP that it must stay alive */ 3621 sp->lcp.protos |= (1 << IDX_IPCP); 3622 } 3623 3624 static void 3625 sppp_ipcp_tlf(struct sppp *sp) 3626 { 3627 3628 KASSERT(SPPP_WLOCKED(sp)); 3629 3630 /* we no longer need LCP */ 3631 sp->lcp.protos &= ~(1 << IDX_IPCP); 3632 } 3633 3634 static void 3635 sppp_ipcp_scr(struct sppp *sp) 3636 { 3637 uint8_t opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3638 #ifdef INET 3639 uint32_t ouraddr; 3640 #endif 3641 int i = 0; 3642 3643 KASSERT(SPPP_WLOCKED(sp)); 3644 3645 #ifdef notyet 3646 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3647 opt[i++] = IPCP_OPT_COMPRESSION; 3648 opt[i++] = 6; 3649 opt[i++] = 0; /* VJ header compression */ 3650 opt[i++] = 0x2d; /* VJ header compression */ 3651 opt[i++] = max_slot_id; 3652 opt[i++] = comp_slot_id; 3653 } 3654 #endif 3655 3656 #ifdef INET 3657 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3658 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3659 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3660 else 3661 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3662 opt[i++] = IPCP_OPT_ADDRESS; 3663 opt[i++] = 6; 3664 opt[i++] = ouraddr >> 24; 3665 opt[i++] = ouraddr >> 16; 3666 opt[i++] = ouraddr >> 8; 3667 opt[i++] = ouraddr; 3668 } 3669 #endif 3670 3671 if (sp->query_dns & 1) { 3672 opt[i++] = IPCP_OPT_PRIMDNS; 3673 opt[i++] = 6; 3674 opt[i++] = sp->dns_addrs[0] >> 24; 3675 opt[i++] = sp->dns_addrs[0] >> 16; 3676 opt[i++] = sp->dns_addrs[0] >> 8; 3677 opt[i++] = sp->dns_addrs[0]; 3678 } 3679 if (sp->query_dns & 2) { 3680 opt[i++] = IPCP_OPT_SECDNS; 3681 opt[i++] = 6; 3682 opt[i++] = sp->dns_addrs[1] >> 24; 3683 opt[i++] = sp->dns_addrs[1] >> 16; 3684 opt[i++] = sp->dns_addrs[1] >> 8; 3685 opt[i++] = sp->dns_addrs[1]; 3686 } 3687 3688 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3689 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3690 } 3691 3692 3693 /* 3694 *--------------------------------------------------------------------------* 3695 * * 3696 * The IPv6CP implementation. * 3697 * * 3698 *--------------------------------------------------------------------------* 3699 */ 3700 3701 #ifdef INET6 3702 static void 3703 sppp_ipv6cp_init(struct sppp *sp) 3704 { 3705 3706 KASSERT(SPPP_WLOCKED(sp)); 3707 3708 sp->ipv6cp.opts = 0; 3709 sp->ipv6cp.flags = 0; 3710 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3711 sp->fail_counter[IDX_IPV6CP] = 0; 3712 sp->pp_seq[IDX_IPV6CP] = 0; 3713 sp->pp_rseq[IDX_IPV6CP] = 0; 3714 callout_init(&sp->ch[IDX_IPV6CP], CALLOUT_MPSAFE); 3715 } 3716 3717 static void 3718 sppp_ipv6cp_up(struct sppp *sp) 3719 { 3720 3721 KASSERT(SPPP_WLOCKED(sp)); 3722 sppp_up_event(&ipv6cp, sp); 3723 } 3724 3725 static void 3726 sppp_ipv6cp_down(struct sppp *sp) 3727 { 3728 3729 KASSERT(SPPP_WLOCKED(sp)); 3730 sppp_down_event(&ipv6cp, sp); 3731 } 3732 3733 static void 3734 sppp_ipv6cp_open(struct sppp *sp) 3735 { 3736 STDDCL; 3737 struct in6_addr myaddr, hisaddr; 3738 3739 KASSERT(SPPP_WLOCKED(sp)); 3740 3741 #ifdef IPV6CP_MYIFID_DYN 3742 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3743 #else 3744 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3745 #endif 3746 3747 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3748 /* 3749 * If we don't have our address, this probably means our 3750 * interface doesn't want to talk IPv6 at all. (This could 3751 * be the case if somebody wants to speak only IPX, for 3752 * example.) Don't open IPv6CP in this case. 3753 */ 3754 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3755 /* XXX this message should go away */ 3756 if (debug) 3757 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3758 ifp->if_xname); 3759 return; 3760 } 3761 3762 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3763 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3764 sppp_open_event(&ipv6cp, sp); 3765 } 3766 3767 static void 3768 sppp_ipv6cp_close(struct sppp *sp) 3769 { 3770 3771 KASSERT(SPPP_WLOCKED(sp)); 3772 sppp_close_event(&ipv6cp, sp); 3773 } 3774 3775 static void 3776 sppp_ipv6cp_TO(void *cookie) 3777 { 3778 struct sppp *sp = cookie; 3779 3780 SPPP_LOCK(sp, RW_WRITER); 3781 sppp_to_event(&ipv6cp, sp); 3782 SPPP_UNLOCK(sp); 3783 } 3784 3785 /* 3786 * Analyze a configure request. Return true if it was agreeable, and 3787 * caused action sca, false if it has been rejected or nak'ed, and 3788 * caused action scn. (The return value is used to make the state 3789 * transition decision in the state automaton.) 3790 */ 3791 static int 3792 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3793 { 3794 u_char *buf, *r, *p, l, blen; 3795 struct ifnet *ifp = &sp->pp_if; 3796 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3797 struct in6_addr myaddr, desiredaddr, suggestaddr; 3798 int ifidcount; 3799 int type; 3800 int collision, nohisaddr; 3801 char ip6buf[INET6_ADDRSTRLEN]; 3802 3803 KASSERT(SPPP_WLOCKED(sp)); 3804 3805 len -= 4; 3806 origlen = len; 3807 /* 3808 * Make sure to allocate a buf that can at least hold a 3809 * conf-nak with an `address' option. We might need it below. 3810 */ 3811 blen = len < 6 ? 6 : len; 3812 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 3813 if (! buf) 3814 return (0); 3815 3816 /* pass 1: see if we can recognize them */ 3817 if (debug) 3818 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3819 ifp->if_xname); 3820 p = (void *)(h + 1); 3821 ifidcount = 0; 3822 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3823 /* Sanity check option length */ 3824 if (l > len) { 3825 /* XXX just RXJ? */ 3826 addlog("%s: received malicious IPCPv6 option, " 3827 "dropping\n", ifp->if_xname); 3828 goto drop; 3829 } 3830 if (debug) 3831 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3832 switch (*p) { 3833 case IPV6CP_OPT_IFID: 3834 if (len >= 10 && l == 10 && ifidcount == 0) { 3835 /* correctly formed address option */ 3836 ifidcount++; 3837 continue; 3838 } 3839 if (debug) 3840 addlog(" [invalid]"); 3841 break; 3842 #ifdef notyet 3843 case IPV6CP_OPT_COMPRESSION: 3844 if (len >= 4 && l >= 4) { 3845 /* correctly formed compress option */ 3846 continue; 3847 } 3848 if (debug) 3849 addlog(" [invalid]"); 3850 break; 3851 #endif 3852 default: 3853 /* Others not supported. */ 3854 if (debug) 3855 addlog(" [rej]"); 3856 break; 3857 } 3858 if (rlen + l > blen) { 3859 if (debug) 3860 addlog(" [overflow]"); 3861 continue; 3862 } 3863 /* Add the option to rejected list. */ 3864 memcpy(r, p, l); 3865 r += l; 3866 rlen += l; 3867 } 3868 if (rlen) { 3869 if (debug) 3870 addlog(" send conf-rej\n"); 3871 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3872 goto end; 3873 } else if (debug) 3874 addlog("\n"); 3875 3876 /* pass 2: parse option values */ 3877 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3878 if (debug) 3879 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3880 ifp->if_xname); 3881 p = (void *)(h + 1); 3882 len = origlen; 3883 type = CONF_ACK; 3884 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3885 if (debug) 3886 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3887 switch (*p) { 3888 #ifdef notyet 3889 case IPV6CP_OPT_COMPRESSION: 3890 continue; 3891 #endif 3892 case IPV6CP_OPT_IFID: 3893 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3894 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3895 collision = (memcmp(&desiredaddr.s6_addr[8], 3896 &myaddr.s6_addr[8], 8) == 0); 3897 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3898 3899 desiredaddr.s6_addr16[0] = htons(0xfe80); 3900 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3901 3902 if (!collision && !nohisaddr) { 3903 /* no collision, hisaddr known - Conf-Ack */ 3904 type = CONF_ACK; 3905 3906 if (debug) { 3907 addlog(" %s [%s]", 3908 IN6_PRINT(ip6buf, &desiredaddr), 3909 sppp_cp_type_name(type)); 3910 } 3911 continue; 3912 } 3913 3914 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3915 if (collision && nohisaddr) { 3916 /* collision, hisaddr unknown - Conf-Rej */ 3917 type = CONF_REJ; 3918 memset(&p[2], 0, 8); 3919 } else { 3920 /* 3921 * - no collision, hisaddr unknown, or 3922 * - collision, hisaddr known 3923 * Conf-Nak, suggest hisaddr 3924 */ 3925 type = CONF_NAK; 3926 sppp_suggest_ip6_addr(sp, &suggestaddr); 3927 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3928 } 3929 if (debug) 3930 addlog(" %s [%s]", IN6_PRINT(ip6buf, &desiredaddr), 3931 sppp_cp_type_name(type)); 3932 break; 3933 } 3934 if (rlen + l > blen) { 3935 if (debug) 3936 addlog(" [overflow]"); 3937 continue; 3938 } 3939 /* Add the option to nak'ed list. */ 3940 memcpy(r, p, l); 3941 r += l; 3942 rlen += l; 3943 } 3944 3945 if (rlen == 0 && type == CONF_ACK) { 3946 if (debug) 3947 addlog(" send %s\n", sppp_cp_type_name(type)); 3948 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3949 } else { 3950 #ifdef notdef 3951 if (type == CONF_ACK) 3952 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3953 #endif 3954 3955 if (debug) { 3956 addlog(" send %s suggest %s\n", 3957 sppp_cp_type_name(type), IN6_PRINT(ip6buf, &suggestaddr)); 3958 } 3959 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3960 } 3961 3962 end: 3963 free(buf, M_TEMP); 3964 return (rlen == 0); 3965 3966 drop: 3967 free(buf, M_TEMP); 3968 return -1; 3969 } 3970 3971 /* 3972 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3973 * negotiation. 3974 */ 3975 static void 3976 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3977 { 3978 u_char *buf, *p, l, blen; 3979 struct ifnet *ifp = &sp->pp_if; 3980 int debug = ifp->if_flags & IFF_DEBUG; 3981 3982 KASSERT(SPPP_WLOCKED(sp)); 3983 3984 len -= 4; 3985 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3986 if (!buf) 3987 return; 3988 3989 if (debug) 3990 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3991 ifp->if_xname); 3992 3993 p = (void *)(h + 1); 3994 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3995 if (l > len) { 3996 /* XXX just RXJ? */ 3997 addlog("%s: received malicious IPCPv6 option, " 3998 "dropping\n", ifp->if_xname); 3999 goto drop; 4000 } 4001 if (debug) 4002 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 4003 switch (*p) { 4004 case IPV6CP_OPT_IFID: 4005 /* 4006 * Peer doesn't grok address option. This is 4007 * bad. XXX Should we better give up here? 4008 */ 4009 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 4010 break; 4011 #ifdef notyet 4012 case IPV6CP_OPT_COMPRESS: 4013 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 4014 break; 4015 #endif 4016 } 4017 } 4018 if (debug) 4019 addlog("\n"); 4020 drop: 4021 free(buf, M_TEMP); 4022 return; 4023 } 4024 4025 /* 4026 * Analyze the IPv6CP Configure-NAK option list, and adjust our 4027 * negotiation. 4028 */ 4029 static void 4030 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 4031 { 4032 u_char *buf, *p, l, blen; 4033 struct ifnet *ifp = &sp->pp_if; 4034 int debug = ifp->if_flags & IFF_DEBUG; 4035 struct in6_addr suggestaddr; 4036 char ip6buf[INET6_ADDRSTRLEN]; 4037 4038 KASSERT(SPPP_WLOCKED(sp)); 4039 4040 len -= 4; 4041 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 4042 if (!buf) 4043 return; 4044 4045 if (debug) 4046 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 4047 ifp->if_xname); 4048 4049 p = (void *)(h + 1); 4050 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 4051 if (l > len) { 4052 /* XXX just RXJ? */ 4053 addlog("%s: received malicious IPCPv6 option, " 4054 "dropping\n", ifp->if_xname); 4055 goto drop; 4056 } 4057 if (debug) 4058 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 4059 switch (*p) { 4060 case IPV6CP_OPT_IFID: 4061 /* 4062 * Peer doesn't like our local ifid. See 4063 * if we can do something for him. We'll drop 4064 * him our address then. 4065 */ 4066 if (len < 10 || l != 10) 4067 break; 4068 memset(&suggestaddr, 0, sizeof(suggestaddr)); 4069 suggestaddr.s6_addr16[0] = htons(0xfe80); 4070 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 4071 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 4072 4073 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 4074 if (debug) 4075 addlog(" [suggestaddr %s]", 4076 IN6_PRINT(ip6buf, &suggestaddr)); 4077 #ifdef IPV6CP_MYIFID_DYN 4078 /* 4079 * When doing dynamic address assignment, 4080 * we accept his offer. 4081 */ 4082 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 4083 struct in6_addr lastsuggest; 4084 /* 4085 * If <suggested myaddr from peer> equals to 4086 * <hisaddr we have suggested last time>, 4087 * we have a collision. generate new random 4088 * ifid. 4089 */ 4090 sppp_suggest_ip6_addr(&lastsuggest); 4091 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 4092 lastsuggest)) { 4093 if (debug) 4094 addlog(" [random]"); 4095 sppp_gen_ip6_addr(sp, &suggestaddr); 4096 } 4097 sppp_set_ip6_addr(sp, &suggestaddr, 0); 4098 if (debug) 4099 addlog(" [agree]"); 4100 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 4101 } 4102 #else 4103 /* 4104 * Since we do not do dynamic address assignment, 4105 * we ignore it and thus continue to negotiate 4106 * our already existing value. This can possibly 4107 * go into infinite request-reject loop. 4108 * 4109 * This is not likely because we normally use 4110 * ifid based on MAC-address. 4111 * If you have no ethernet card on the node, too bad. 4112 * XXX should we use fail_counter? 4113 */ 4114 #endif 4115 break; 4116 #ifdef notyet 4117 case IPV6CP_OPT_COMPRESS: 4118 /* 4119 * Peer wants different compression parameters. 4120 */ 4121 break; 4122 #endif 4123 } 4124 } 4125 if (debug) 4126 addlog("\n"); 4127 drop: 4128 free(buf, M_TEMP); 4129 return; 4130 } 4131 4132 static void 4133 sppp_ipv6cp_tlu(struct sppp *sp) 4134 { 4135 4136 KASSERT(SPPP_WLOCKED(sp)); 4137 /* we are up - notify isdn daemon */ 4138 sppp_notify_con_wlocked(sp); 4139 } 4140 4141 static void 4142 sppp_ipv6cp_tld(struct sppp *sp) 4143 { 4144 4145 KASSERT(SPPP_WLOCKED(sp)); 4146 } 4147 4148 static void 4149 sppp_ipv6cp_tls(struct sppp *sp) 4150 { 4151 4152 KASSERT(SPPP_WLOCKED(sp)); 4153 /* indicate to LCP that it must stay alive */ 4154 sp->lcp.protos |= (1 << IDX_IPV6CP); 4155 } 4156 4157 static void 4158 sppp_ipv6cp_tlf(struct sppp *sp) 4159 { 4160 4161 KASSERT(SPPP_WLOCKED(sp)); 4162 /* we no longer need LCP */ 4163 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 4164 } 4165 4166 static void 4167 sppp_ipv6cp_scr(struct sppp *sp) 4168 { 4169 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 4170 struct in6_addr ouraddr; 4171 int i = 0; 4172 4173 KASSERT(SPPP_WLOCKED(sp)); 4174 4175 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 4176 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 4177 opt[i++] = IPV6CP_OPT_IFID; 4178 opt[i++] = 10; 4179 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 4180 i += 8; 4181 } 4182 4183 #ifdef notyet 4184 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 4185 opt[i++] = IPV6CP_OPT_COMPRESSION; 4186 opt[i++] = 4; 4187 opt[i++] = 0; /* TBD */ 4188 opt[i++] = 0; /* TBD */ 4189 /* variable length data may follow */ 4190 } 4191 #endif 4192 4193 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 4194 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 4195 } 4196 #else /*INET6*/ 4197 static void 4198 sppp_ipv6cp_init(struct sppp *sp) 4199 { 4200 4201 KASSERT(SPPP_WLOCKED(sp)); 4202 } 4203 4204 static void 4205 sppp_ipv6cp_up(struct sppp *sp) 4206 { 4207 4208 KASSERT(SPPP_WLOCKED(sp)); 4209 } 4210 4211 static void 4212 sppp_ipv6cp_down(struct sppp *sp) 4213 { 4214 4215 KASSERT(SPPP_WLOCKED(sp)); 4216 } 4217 4218 static void 4219 sppp_ipv6cp_open(struct sppp *sp) 4220 { 4221 4222 KASSERT(SPPP_WLOCKED(sp)); 4223 } 4224 4225 static void 4226 sppp_ipv6cp_close(struct sppp *sp) 4227 { 4228 4229 KASSERT(SPPP_WLOCKED(sp)); 4230 } 4231 4232 static void 4233 sppp_ipv6cp_TO(void *cookie) 4234 { 4235 struct sppp *sp __diagused = cookie; 4236 4237 KASSERT(SPPP_WLOCKED(sp)); 4238 } 4239 4240 static int 4241 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 4242 int len) 4243 { 4244 4245 KASSERT(SPPP_WLOCKED(sp)); 4246 return 0; 4247 } 4248 4249 static void 4250 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 4251 int len) 4252 { 4253 4254 KASSERT(SPPP_WLOCKED(sp)); 4255 } 4256 4257 static void 4258 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 4259 int len) 4260 { 4261 4262 KASSERT(SPPP_WLOCKED(sp)); 4263 } 4264 4265 static void 4266 sppp_ipv6cp_tlu(struct sppp *sp) 4267 { 4268 4269 KASSERT(SPPP_WLOCKED(sp)); 4270 } 4271 4272 static void 4273 sppp_ipv6cp_tld(struct sppp *sp) 4274 { 4275 4276 KASSERT(SPPP_WLOCKED(sp)); 4277 } 4278 4279 static void 4280 sppp_ipv6cp_tls(struct sppp *sp) 4281 { 4282 4283 KASSERT(SPPP_WLOCKED(sp)); 4284 } 4285 4286 static void 4287 sppp_ipv6cp_tlf(struct sppp *sp) 4288 { 4289 4290 KASSERT(SPPP_WLOCKED(sp)); 4291 } 4292 4293 static void 4294 sppp_ipv6cp_scr(struct sppp *sp) 4295 { 4296 4297 KASSERT(SPPP_WLOCKED(sp)); 4298 } 4299 #endif /*INET6*/ 4300 4301 4302 /* 4303 *--------------------------------------------------------------------------* 4304 * * 4305 * The CHAP implementation. * 4306 * * 4307 *--------------------------------------------------------------------------* 4308 */ 4309 4310 /* 4311 * The authentication protocols don't employ a full-fledged state machine as 4312 * the control protocols do, since they do have Open and Close events, but 4313 * not Up and Down, nor are they explicitly terminated. Also, use of the 4314 * authentication protocols may be different in both directions (this makes 4315 * sense, think of a machine that never accepts incoming calls but only 4316 * calls out, it doesn't require the called party to authenticate itself). 4317 * 4318 * Our state machine for the local authentication protocol (we are requesting 4319 * the peer to authenticate) looks like: 4320 * 4321 * RCA- 4322 * +--------------------------------------------+ 4323 * V scn,tld| 4324 * +--------+ Close +---------+ RCA+ 4325 * | |<----------------------------------| |------+ 4326 * +--->| Closed | TO* | Opened | sca | 4327 * | | |-----+ +-------| |<-----+ 4328 * | +--------+ irc | | +---------+ 4329 * | ^ | | ^ 4330 * | | | | | 4331 * | | | | | 4332 * | TO-| | | | 4333 * | |tld TO+ V | | 4334 * | | +------->+ | | 4335 * | | | | | | 4336 * | +--------+ V | | 4337 * | | |<----+<--------------------+ | 4338 * | | Req- | scr | 4339 * | | Sent | | 4340 * | | | | 4341 * | +--------+ | 4342 * | RCA- | | RCA+ | 4343 * +------+ +------------------------------------------+ 4344 * scn,tld sca,irc,ict,tlu 4345 * 4346 * 4347 * with: 4348 * 4349 * Open: LCP reached authentication phase 4350 * Close: LCP reached terminate phase 4351 * 4352 * RCA+: received reply (pap-req, chap-response), acceptable 4353 * RCN: received reply (pap-req, chap-response), not acceptable 4354 * TO+: timeout with restart counter >= 0 4355 * TO-: timeout with restart counter < 0 4356 * TO*: reschedule timeout for CHAP 4357 * 4358 * scr: send request packet (none for PAP, chap-challenge) 4359 * sca: send ack packet (pap-ack, chap-success) 4360 * scn: send nak packet (pap-nak, chap-failure) 4361 * ict: initialize re-challenge timer (CHAP only) 4362 * 4363 * tlu: this-layer-up, LCP reaches network phase 4364 * tld: this-layer-down, LCP enters terminate phase 4365 * 4366 * Note that in CHAP mode, after sending a new challenge, while the state 4367 * automaton falls back into Req-Sent state, it doesn't signal a tld 4368 * event to LCP, so LCP remains in network phase. Only after not getting 4369 * any response (or after getting an unacceptable response), CHAP closes, 4370 * causing LCP to enter terminate phase. 4371 * 4372 * With PAP, there is no initial request that can be sent. The peer is 4373 * expected to send one based on the successful negotiation of PAP as 4374 * the authentication protocol during the LCP option negotiation. 4375 * 4376 * Incoming authentication protocol requests (remote requests 4377 * authentication, we are peer) don't employ a state machine at all, 4378 * they are simply answered. Some peers [Ascend P50 firmware rev 4379 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 4380 * still in authentication phase (thereby violating the standard that 4381 * demands that these NCP packets are to be discarded), so we keep 4382 * track of the peer demanding us to authenticate, and only proceed to 4383 * phase network once we've seen a positive acknowledge for the 4384 * authentication. 4385 */ 4386 4387 /* 4388 * Handle incoming CHAP packets. 4389 */ 4390 void 4391 sppp_chap_input(struct sppp *sp, struct mbuf *m) 4392 { 4393 STDDCL; 4394 struct lcp_header *h; 4395 int len, x; 4396 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 4397 int value_len, name_len; 4398 MD5_CTX ctx; 4399 4400 len = m->m_pkthdr.len; 4401 if (len < 4) { 4402 if (debug) 4403 log(LOG_DEBUG, 4404 "%s: chap invalid packet length: %d bytes\n", 4405 ifp->if_xname, len); 4406 return; 4407 } 4408 h = mtod(m, struct lcp_header *); 4409 if (len > ntohs(h->len)) 4410 len = ntohs(h->len); 4411 4412 SPPP_LOCK(sp, RW_WRITER); 4413 4414 switch (h->type) { 4415 /* challenge, failure and success are his authproto */ 4416 case CHAP_CHALLENGE: 4417 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4418 /* can't do anything useful */ 4419 sp->pp_auth_failures++; 4420 printf("%s: chap input without my name and my secret being set\n", 4421 ifp->if_xname); 4422 break; 4423 } 4424 value = 1 + (u_char *)(h + 1); 4425 value_len = value[-1]; 4426 name = value + value_len; 4427 name_len = len - value_len - 5; 4428 if (name_len < 0) { 4429 if (debug) { 4430 log(LOG_DEBUG, 4431 "%s: chap corrupted challenge " 4432 "<%s id=0x%x len=%d", 4433 ifp->if_xname, 4434 sppp_auth_type_name(PPP_CHAP, h->type), 4435 h->ident, ntohs(h->len)); 4436 if (len > 4) 4437 sppp_print_bytes((u_char *)(h + 1), 4438 len - 4); 4439 addlog(">\n"); 4440 } 4441 break; 4442 } 4443 4444 if (debug) { 4445 log(LOG_DEBUG, 4446 "%s: chap input <%s id=0x%x len=%d name=", 4447 ifp->if_xname, 4448 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 4449 ntohs(h->len)); 4450 sppp_print_string((char *) name, name_len); 4451 addlog(" value-size=%d value=", value_len); 4452 sppp_print_bytes(value, value_len); 4453 addlog(">\n"); 4454 } 4455 4456 /* Compute reply value. */ 4457 MD5Init(&ctx); 4458 MD5Update(&ctx, &h->ident, 1); 4459 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 4460 MD5Update(&ctx, value, value_len); 4461 MD5Final(digest, &ctx); 4462 dsize = sizeof digest; 4463 4464 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 4465 sizeof dsize, (const char *)&dsize, 4466 sizeof digest, digest, 4467 sp->myauth.name_len, 4468 sp->myauth.name, 4469 0); 4470 break; 4471 4472 case CHAP_SUCCESS: 4473 if (debug) { 4474 log(LOG_DEBUG, "%s: chap success", 4475 ifp->if_xname); 4476 if (len > 4) { 4477 addlog(": "); 4478 sppp_print_string((char *)(h + 1), len - 4); 4479 } 4480 addlog("\n"); 4481 } 4482 x = splnet(); 4483 sp->pp_auth_failures = 0; 4484 sp->pp_flags &= ~PP_NEEDAUTH; 4485 if (sp->myauth.proto == PPP_CHAP && 4486 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4487 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 4488 /* 4489 * We are authenticator for CHAP but didn't 4490 * complete yet. Leave it to tlu to proceed 4491 * to network phase. 4492 */ 4493 splx(x); 4494 break; 4495 } 4496 splx(x); 4497 sppp_phase_network(sp); 4498 break; 4499 4500 case CHAP_FAILURE: 4501 x = splnet(); 4502 sp->pp_auth_failures++; 4503 splx(x); 4504 if (debug) { 4505 log(LOG_INFO, "%s: chap failure", 4506 ifp->if_xname); 4507 if (len > 4) { 4508 addlog(": "); 4509 sppp_print_string((char *)(h + 1), len - 4); 4510 } 4511 addlog("\n"); 4512 } else 4513 log(LOG_INFO, "%s: chap failure\n", 4514 ifp->if_xname); 4515 /* await LCP shutdown by authenticator */ 4516 break; 4517 4518 /* response is my authproto */ 4519 case CHAP_RESPONSE: 4520 if (sp->hisauth.secret == NULL) { 4521 /* can't do anything useful */ 4522 printf("%s: chap input without his secret being set\n", 4523 ifp->if_xname); 4524 break; 4525 } 4526 value = 1 + (u_char *)(h + 1); 4527 value_len = value[-1]; 4528 name = value + value_len; 4529 name_len = len - value_len - 5; 4530 if (name_len < 0) { 4531 if (debug) { 4532 log(LOG_DEBUG, 4533 "%s: chap corrupted response " 4534 "<%s id=0x%x len=%d", 4535 ifp->if_xname, 4536 sppp_auth_type_name(PPP_CHAP, h->type), 4537 h->ident, ntohs(h->len)); 4538 if (len > 4) 4539 sppp_print_bytes((u_char *)(h + 1), 4540 len - 4); 4541 addlog(">\n"); 4542 } 4543 break; 4544 } 4545 if (h->ident != sp->confid[IDX_CHAP]) { 4546 if (debug) 4547 log(LOG_DEBUG, 4548 "%s: chap dropping response for old ID " 4549 "(got %d, expected %d)\n", 4550 ifp->if_xname, 4551 h->ident, sp->confid[IDX_CHAP]); 4552 break; 4553 } 4554 if (sp->hisauth.name != NULL && 4555 (name_len != sp->hisauth.name_len 4556 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4557 log(LOG_INFO, "%s: chap response, his name ", 4558 ifp->if_xname); 4559 sppp_print_string(name, name_len); 4560 addlog(" != expected "); 4561 sppp_print_string(sp->hisauth.name, 4562 sp->hisauth.name_len); 4563 addlog("\n"); 4564 goto chap_failure; 4565 } 4566 if (debug) { 4567 log(LOG_DEBUG, "%s: chap input(%s) " 4568 "<%s id=0x%x len=%d name=", 4569 ifp->if_xname, 4570 sppp_state_name(sp->state[IDX_CHAP]), 4571 sppp_auth_type_name(PPP_CHAP, h->type), 4572 h->ident, ntohs(h->len)); 4573 sppp_print_string((char *)name, name_len); 4574 addlog(" value-size=%d value=", value_len); 4575 sppp_print_bytes(value, value_len); 4576 addlog(">\n"); 4577 } 4578 if (value_len != sizeof(sp->hisauth.challenge)) { 4579 if (debug) 4580 log(LOG_DEBUG, 4581 "%s: chap bad hash value length: " 4582 "%d bytes, should be %zu\n", 4583 ifp->if_xname, value_len, 4584 sizeof(sp->hisauth.challenge)); 4585 goto chap_failure; 4586 } 4587 4588 MD5Init(&ctx); 4589 MD5Update(&ctx, &h->ident, 1); 4590 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4591 MD5Update(&ctx, sp->hisauth.challenge, sizeof(sp->hisauth.challenge)); 4592 MD5Final(digest, &ctx); 4593 4594 #define FAILMSG "Failed..." 4595 #define SUCCMSG "Welcome!" 4596 4597 if (value_len != sizeof digest || 4598 memcmp(digest, value, value_len) != 0) { 4599 chap_failure: 4600 KASSERT(SPPP_WLOCKED(sp)); 4601 /* action scn, tld */ 4602 sp->pp_auth_failures++; 4603 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4604 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4605 0); 4606 chap.tld(sp); 4607 break; 4608 } 4609 sp->pp_auth_failures = 0; 4610 /* action sca, perhaps tlu */ 4611 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4612 sp->state[IDX_CHAP] == STATE_OPENED) 4613 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4614 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4615 0); 4616 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4617 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4618 chap.tlu(sp); 4619 } 4620 break; 4621 4622 default: 4623 /* Unknown CHAP packet type -- ignore. */ 4624 if (debug) { 4625 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4626 "<0x%x id=0x%xh len=%d", 4627 ifp->if_xname, 4628 sppp_state_name(sp->state[IDX_CHAP]), 4629 h->type, h->ident, ntohs(h->len)); 4630 if (len > 4) 4631 sppp_print_bytes((u_char *)(h + 1), len - 4); 4632 addlog(">\n"); 4633 } 4634 break; 4635 4636 } 4637 4638 SPPP_UNLOCK(sp); 4639 } 4640 4641 static void 4642 sppp_chap_init(struct sppp *sp) 4643 { 4644 4645 KASSERT(SPPP_WLOCKED(sp)); 4646 4647 /* Chap doesn't have STATE_INITIAL at all. */ 4648 sp->state[IDX_CHAP] = STATE_CLOSED; 4649 sp->fail_counter[IDX_CHAP] = 0; 4650 sp->pp_seq[IDX_CHAP] = 0; 4651 sp->pp_rseq[IDX_CHAP] = 0; 4652 callout_init(&sp->ch[IDX_CHAP], CALLOUT_MPSAFE); 4653 } 4654 4655 static void 4656 sppp_chap_open(struct sppp *sp) 4657 { 4658 4659 KASSERT(SPPP_WLOCKED(sp)); 4660 if (sp->hisauth.proto == PPP_CHAP && 4661 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4662 /* we are authenticator for CHAP, start it */ 4663 chap.scr(sp); 4664 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4665 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4666 } 4667 /* nothing to be done if we are peer, await a challenge */ 4668 } 4669 4670 static void 4671 sppp_chap_close(struct sppp *sp) 4672 { 4673 4674 KASSERT(SPPP_WLOCKED(sp)); 4675 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4676 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4677 } 4678 4679 static void 4680 sppp_chap_TO(void *cookie) 4681 { 4682 struct sppp *sp = (struct sppp *)cookie; 4683 STDDCL; 4684 int s; 4685 4686 s = splnet(); 4687 4688 SPPP_LOCK(sp, RW_WRITER); 4689 4690 if (debug) 4691 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4692 ifp->if_xname, 4693 sppp_state_name(sp->state[IDX_CHAP]), 4694 sp->rst_counter[IDX_CHAP]); 4695 4696 if (--sp->rst_counter[IDX_CHAP] < 0) 4697 /* TO- event */ 4698 switch (sp->state[IDX_CHAP]) { 4699 case STATE_REQ_SENT: 4700 chap.tld(sp); 4701 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4702 break; 4703 } 4704 else 4705 /* TO+ (or TO*) event */ 4706 switch (sp->state[IDX_CHAP]) { 4707 case STATE_OPENED: 4708 /* TO* event */ 4709 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4710 /* fall through */ 4711 case STATE_REQ_SENT: 4712 chap.scr(sp); 4713 /* sppp_cp_change_state() will restart the timer */ 4714 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4715 break; 4716 } 4717 4718 SPPP_UNLOCK(sp); 4719 splx(s); 4720 } 4721 4722 static void 4723 sppp_chap_tlu(struct sppp *sp) 4724 { 4725 STDDCL; 4726 int i, x; 4727 4728 KASSERT(SPPP_WLOCKED(sp)); 4729 4730 i = 0; 4731 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4732 4733 /* 4734 * Some broken CHAP implementations (Conware CoNet, firmware 4735 * 4.0.?) don't want to re-authenticate their CHAP once the 4736 * initial challenge-response exchange has taken place. 4737 * Provide for an option to avoid rechallenges. 4738 */ 4739 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4740 /* 4741 * Compute the re-challenge timeout. This will yield 4742 * a number between 300 and 810 seconds. 4743 */ 4744 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4745 4746 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4747 } 4748 4749 if (debug) { 4750 log(LOG_DEBUG, 4751 "%s: chap %s, ", 4752 ifp->if_xname, 4753 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4754 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4755 addlog("next re-challenge in %d seconds\n", i); 4756 else 4757 addlog("re-challenging suppressed\n"); 4758 } 4759 4760 x = splnet(); 4761 sp->pp_auth_failures = 0; 4762 /* indicate to LCP that we need to be closed down */ 4763 sp->lcp.protos |= (1 << IDX_CHAP); 4764 4765 if (sp->pp_flags & PP_NEEDAUTH) { 4766 /* 4767 * Remote is authenticator, but his auth proto didn't 4768 * complete yet. Defer the transition to network 4769 * phase. 4770 */ 4771 splx(x); 4772 return; 4773 } 4774 splx(x); 4775 4776 /* 4777 * If we are already in phase network, we are done here. This 4778 * is the case if this is a dummy tlu event after a re-challenge. 4779 */ 4780 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4781 sppp_phase_network(sp); 4782 } 4783 4784 static void 4785 sppp_chap_tld(struct sppp *sp) 4786 { 4787 STDDCL; 4788 4789 KASSERT(SPPP_WLOCKED(sp)); 4790 4791 if (debug) 4792 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4793 callout_stop(&sp->ch[IDX_CHAP]); 4794 sp->lcp.protos &= ~(1 << IDX_CHAP); 4795 4796 lcp.Close(sp); 4797 } 4798 4799 static void 4800 sppp_chap_scr(struct sppp *sp) 4801 { 4802 uint32_t *ch; 4803 u_char clen = 4 * sizeof(uint32_t); 4804 4805 KASSERT(SPPP_WLOCKED(sp)); 4806 4807 if (sp->hisauth.name == NULL) { 4808 /* can't do anything useful */ 4809 printf("%s: chap starting without his name being set\n", 4810 sp->pp_if.if_xname); 4811 return; 4812 } 4813 4814 /* Compute random challenge. */ 4815 ch = (uint32_t *)sp->hisauth.challenge; 4816 cprng_strong(kern_cprng, ch, clen, 0); 4817 4818 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4819 4820 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4821 sizeof clen, (const char *)&clen, 4822 sizeof(sp->hisauth.challenge), sp->hisauth.challenge, 4823 0); 4824 } 4825 4826 /* 4827 *--------------------------------------------------------------------------* 4828 * * 4829 * The PAP implementation. * 4830 * * 4831 *--------------------------------------------------------------------------* 4832 */ 4833 /* 4834 * For PAP, we need to keep a little state also if we are the peer, not the 4835 * authenticator. This is since we don't get a request to authenticate, but 4836 * have to repeatedly authenticate ourself until we got a response (or the 4837 * retry counter is expired). 4838 */ 4839 4840 /* 4841 * Handle incoming PAP packets. */ 4842 static void 4843 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4844 { 4845 STDDCL; 4846 struct lcp_header *h; 4847 int len, x; 4848 u_char mlen; 4849 char *name, *secret; 4850 int name_len, secret_len; 4851 4852 /* 4853 * Malicious input might leave this uninitialized, so 4854 * init to an impossible value. 4855 */ 4856 secret_len = -1; 4857 4858 len = m->m_pkthdr.len; 4859 if (len < 5) { 4860 if (debug) 4861 log(LOG_DEBUG, 4862 "%s: pap invalid packet length: %d bytes\n", 4863 ifp->if_xname, len); 4864 return; 4865 } 4866 h = mtod(m, struct lcp_header *); 4867 if (len > ntohs(h->len)) 4868 len = ntohs(h->len); 4869 4870 SPPP_LOCK(sp, RW_WRITER); 4871 4872 switch (h->type) { 4873 /* PAP request is my authproto */ 4874 case PAP_REQ: 4875 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4876 /* can't do anything useful */ 4877 printf("%s: " 4878 "pap request without his name and his secret being set\n", 4879 ifp->if_xname); 4880 break; 4881 } 4882 name = 1 + (u_char *)(h + 1); 4883 name_len = name[-1]; 4884 secret = name + name_len + 1; 4885 if (name_len > len - 6 || 4886 (secret_len = secret[-1]) > len - 6 - name_len) { 4887 if (debug) { 4888 log(LOG_DEBUG, "%s: pap corrupted input " 4889 "<%s id=0x%x len=%d", 4890 ifp->if_xname, 4891 sppp_auth_type_name(PPP_PAP, h->type), 4892 h->ident, ntohs(h->len)); 4893 if (len > 4) 4894 sppp_print_bytes((u_char *)(h + 1), 4895 len - 4); 4896 addlog(">\n"); 4897 } 4898 break; 4899 } 4900 if (debug) { 4901 log(LOG_DEBUG, "%s: pap input(%s) " 4902 "<%s id=0x%x len=%d name=", 4903 ifp->if_xname, 4904 sppp_state_name(sp->state[IDX_PAP]), 4905 sppp_auth_type_name(PPP_PAP, h->type), 4906 h->ident, ntohs(h->len)); 4907 sppp_print_string((char *)name, name_len); 4908 addlog(" secret="); 4909 sppp_print_string((char *)secret, secret_len); 4910 addlog(">\n"); 4911 } 4912 if (name_len != sp->hisauth.name_len || 4913 secret_len != sp->hisauth.secret_len || 4914 memcmp(name, sp->hisauth.name, name_len) != 0 || 4915 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4916 /* action scn, tld */ 4917 sp->pp_auth_failures++; 4918 mlen = sizeof(FAILMSG) - 1; 4919 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4920 sizeof mlen, (const char *)&mlen, 4921 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4922 0); 4923 pap.tld(sp); 4924 break; 4925 } 4926 /* action sca, perhaps tlu */ 4927 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4928 sp->state[IDX_PAP] == STATE_OPENED) { 4929 mlen = sizeof(SUCCMSG) - 1; 4930 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4931 sizeof mlen, (const char *)&mlen, 4932 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4933 0); 4934 } 4935 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4936 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4937 pap.tlu(sp); 4938 } 4939 break; 4940 4941 /* ack and nak are his authproto */ 4942 case PAP_ACK: 4943 callout_stop(&sp->pap_my_to_ch); 4944 if (debug) { 4945 log(LOG_DEBUG, "%s: pap success", 4946 ifp->if_xname); 4947 name = 1 + (u_char *)(h + 1); 4948 name_len = name[-1]; 4949 if (len > 5 && name_len < len+4) { 4950 addlog(": "); 4951 sppp_print_string(name, name_len); 4952 } 4953 addlog("\n"); 4954 } 4955 x = splnet(); 4956 sp->pp_auth_failures = 0; 4957 sp->pp_flags &= ~PP_NEEDAUTH; 4958 if (sp->myauth.proto == PPP_PAP && 4959 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4960 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4961 /* 4962 * We are authenticator for PAP but didn't 4963 * complete yet. Leave it to tlu to proceed 4964 * to network phase. 4965 */ 4966 splx(x); 4967 break; 4968 } 4969 splx(x); 4970 sppp_phase_network(sp); 4971 break; 4972 4973 case PAP_NAK: 4974 callout_stop(&sp->pap_my_to_ch); 4975 sp->pp_auth_failures++; 4976 if (debug) { 4977 log(LOG_INFO, "%s: pap failure", 4978 ifp->if_xname); 4979 name = 1 + (u_char *)(h + 1); 4980 name_len = name[-1]; 4981 if (len > 5 && name_len < len+4) { 4982 addlog(": "); 4983 sppp_print_string(name, name_len); 4984 } 4985 addlog("\n"); 4986 } else 4987 log(LOG_INFO, "%s: pap failure\n", 4988 ifp->if_xname); 4989 /* await LCP shutdown by authenticator */ 4990 break; 4991 4992 default: 4993 /* Unknown PAP packet type -- ignore. */ 4994 if (debug) { 4995 log(LOG_DEBUG, "%s: pap corrupted input " 4996 "<0x%x id=0x%x len=%d", 4997 ifp->if_xname, 4998 h->type, h->ident, ntohs(h->len)); 4999 if (len > 4) 5000 sppp_print_bytes((u_char *)(h + 1), len - 4); 5001 addlog(">\n"); 5002 } 5003 break; 5004 } 5005 5006 SPPP_UNLOCK(sp); 5007 } 5008 5009 static void 5010 sppp_pap_init(struct sppp *sp) 5011 { 5012 5013 KASSERT(SPPP_WLOCKED(sp)); 5014 5015 /* PAP doesn't have STATE_INITIAL at all. */ 5016 sp->state[IDX_PAP] = STATE_CLOSED; 5017 sp->fail_counter[IDX_PAP] = 0; 5018 sp->pp_seq[IDX_PAP] = 0; 5019 sp->pp_rseq[IDX_PAP] = 0; 5020 callout_init(&sp->ch[IDX_PAP], CALLOUT_MPSAFE); 5021 callout_init(&sp->pap_my_to_ch, CALLOUT_MPSAFE); 5022 } 5023 5024 static void 5025 sppp_pap_open(struct sppp *sp) 5026 { 5027 5028 KASSERT(SPPP_WLOCKED(sp)); 5029 5030 if (sp->hisauth.proto == PPP_PAP && 5031 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 5032 /* we are authenticator for PAP, start our timer */ 5033 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 5034 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 5035 } 5036 if (sp->myauth.proto == PPP_PAP) { 5037 /* we are peer, send a request, and start a timer */ 5038 pap.scr(sp); 5039 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 5040 sppp_pap_my_TO, sp); 5041 } 5042 } 5043 5044 static void 5045 sppp_pap_close(struct sppp *sp) 5046 { 5047 5048 KASSERT(SPPP_WLOCKED(sp)); 5049 5050 if (sp->state[IDX_PAP] != STATE_CLOSED) 5051 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 5052 } 5053 5054 /* 5055 * That's the timeout routine if we are authenticator. Since the 5056 * authenticator is basically passive in PAP, we can't do much here. 5057 */ 5058 static void 5059 sppp_pap_TO(void *cookie) 5060 { 5061 struct sppp *sp = (struct sppp *)cookie; 5062 STDDCL; 5063 int s; 5064 5065 s = splnet(); 5066 SPPP_LOCK(sp, RW_WRITER); 5067 5068 if (debug) 5069 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 5070 ifp->if_xname, 5071 sppp_state_name(sp->state[IDX_PAP]), 5072 sp->rst_counter[IDX_PAP]); 5073 5074 if (--sp->rst_counter[IDX_PAP] < 0) 5075 /* TO- event */ 5076 switch (sp->state[IDX_PAP]) { 5077 case STATE_REQ_SENT: 5078 pap.tld(sp); 5079 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 5080 break; 5081 } 5082 else 5083 /* TO+ event, not very much we could do */ 5084 switch (sp->state[IDX_PAP]) { 5085 case STATE_REQ_SENT: 5086 /* sppp_cp_change_state() will restart the timer */ 5087 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 5088 break; 5089 } 5090 5091 SPPP_UNLOCK(sp); 5092 splx(s); 5093 } 5094 5095 /* 5096 * That's the timeout handler if we are peer. Since the peer is active, 5097 * we need to retransmit our PAP request since it is apparently lost. 5098 * XXX We should impose a max counter. 5099 */ 5100 static void 5101 sppp_pap_my_TO(void *cookie) 5102 { 5103 struct sppp *sp = (struct sppp *)cookie; 5104 STDDCL; 5105 5106 SPPP_LOCK(sp, RW_WRITER); 5107 if (debug) 5108 log(LOG_DEBUG, "%s: pap peer TO\n", 5109 ifp->if_xname); 5110 5111 pap.scr(sp); 5112 5113 SPPP_UNLOCK(sp); 5114 } 5115 5116 static void 5117 sppp_pap_tlu(struct sppp *sp) 5118 { 5119 STDDCL; 5120 int x; 5121 5122 KASSERT(SPPP_WLOCKED(sp)); 5123 5124 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 5125 5126 if (debug) 5127 log(LOG_DEBUG, "%s: %s tlu\n", 5128 ifp->if_xname, pap.name); 5129 5130 x = splnet(); 5131 sp->pp_auth_failures = 0; 5132 /* indicate to LCP that we need to be closed down */ 5133 sp->lcp.protos |= (1 << IDX_PAP); 5134 5135 if (sp->pp_flags & PP_NEEDAUTH) { 5136 /* 5137 * Remote is authenticator, but his auth proto didn't 5138 * complete yet. Defer the transition to network 5139 * phase. 5140 */ 5141 splx(x); 5142 return; 5143 } 5144 splx(x); 5145 sppp_phase_network(sp); 5146 } 5147 5148 static void 5149 sppp_pap_tld(struct sppp *sp) 5150 { 5151 STDDCL; 5152 5153 KASSERT(SPPP_WLOCKED(sp)); 5154 5155 if (debug) 5156 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 5157 callout_stop(&sp->ch[IDX_PAP]); 5158 callout_stop(&sp->pap_my_to_ch); 5159 sp->lcp.protos &= ~(1 << IDX_PAP); 5160 5161 lcp.Close(sp); 5162 } 5163 5164 static void 5165 sppp_pap_scr(struct sppp *sp) 5166 { 5167 u_char idlen, pwdlen; 5168 5169 KASSERT(SPPP_WLOCKED(sp)); 5170 5171 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 5172 /* can't do anything useful */ 5173 printf("%s: pap starting without my name and secret being set\n", 5174 sp->pp_if.if_xname); 5175 return; 5176 } 5177 5178 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 5179 pwdlen = sp->myauth.secret_len; 5180 idlen = sp->myauth.name_len; 5181 5182 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 5183 sizeof idlen, (const char *)&idlen, 5184 idlen, sp->myauth.name, 5185 sizeof pwdlen, (const char *)&pwdlen, 5186 pwdlen, sp->myauth.secret, 5187 0); 5188 } 5189 5190 /* 5191 * Random miscellaneous functions. 5192 */ 5193 5194 /* 5195 * Send a PAP or CHAP proto packet. 5196 * 5197 * Varadic function, each of the elements for the ellipsis is of type 5198 * ``size_t mlen, const u_char *msg''. Processing will stop iff 5199 * mlen == 0. 5200 * NOTE: never declare variadic functions with types subject to type 5201 * promotion (i.e. u_char). This is asking for big trouble depending 5202 * on the architecture you are on... 5203 */ 5204 5205 static void 5206 sppp_auth_send(const struct cp *cp, struct sppp *sp, 5207 unsigned int type, unsigned int id, 5208 ...) 5209 { 5210 STDDCL; 5211 struct lcp_header *lh; 5212 struct mbuf *m; 5213 u_char *p; 5214 int len; 5215 size_t pkthdrlen; 5216 unsigned int mlen; 5217 const char *msg; 5218 va_list ap; 5219 5220 KASSERT(SPPP_WLOCKED(sp)); 5221 5222 MGETHDR(m, M_DONTWAIT, MT_DATA); 5223 if (! m) 5224 return; 5225 m_reset_rcvif(m); 5226 5227 if (sp->pp_flags & PP_NOFRAMING) { 5228 *mtod(m, uint16_t *) = htons(cp->proto); 5229 pkthdrlen = 2; 5230 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 5231 } else { 5232 struct ppp_header *h; 5233 h = mtod(m, struct ppp_header *); 5234 h->address = PPP_ALLSTATIONS; /* broadcast address */ 5235 h->control = PPP_UI; /* Unnumbered Info */ 5236 h->protocol = htons(cp->proto); 5237 pkthdrlen = PPP_HEADER_LEN; 5238 5239 lh = (struct lcp_header *)(h + 1); 5240 } 5241 5242 lh->type = type; 5243 lh->ident = id; 5244 p = (u_char *)(lh + 1); 5245 5246 va_start(ap, id); 5247 len = 0; 5248 5249 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 5250 msg = va_arg(ap, const char *); 5251 len += mlen; 5252 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 5253 va_end(ap); 5254 m_freem(m); 5255 return; 5256 } 5257 5258 memcpy(p, msg, mlen); 5259 p += mlen; 5260 } 5261 va_end(ap); 5262 5263 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 5264 lh->len = htons(LCP_HEADER_LEN + len); 5265 5266 if (debug) { 5267 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 5268 ifp->if_xname, cp->name, 5269 sppp_auth_type_name(cp->proto, lh->type), 5270 lh->ident, ntohs(lh->len)); 5271 if (len) 5272 sppp_print_bytes((u_char *)(lh + 1), len); 5273 addlog(">\n"); 5274 } 5275 if (IF_QFULL(&sp->pp_cpq)) { 5276 IF_DROP(&sp->pp_fastq); 5277 IF_DROP(&ifp->if_snd); 5278 m_freem(m); 5279 if_statinc(ifp, if_oerrors); 5280 return; 5281 } 5282 5283 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 5284 IF_ENQUEUE(&sp->pp_cpq, m); 5285 5286 if (! (ifp->if_flags & IFF_OACTIVE)) { 5287 SPPP_UNLOCK(sp); 5288 if_start_lock(ifp); 5289 SPPP_LOCK(sp, RW_WRITER); 5290 } 5291 } 5292 5293 /* 5294 * Send keepalive packets, every 10 seconds. 5295 */ 5296 static void 5297 sppp_keepalive(void *dummy) 5298 { 5299 struct sppp *sp; 5300 int s; 5301 time_t now; 5302 5303 SPPPQ_LOCK(); 5304 5305 s = splnet(); 5306 now = time_uptime; 5307 for (sp=spppq; sp; sp=sp->pp_next) { 5308 struct ifnet *ifp = NULL; 5309 5310 SPPP_LOCK(sp, RW_WRITER); 5311 ifp = &sp->pp_if; 5312 5313 /* check idle timeout */ 5314 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 5315 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 5316 /* idle timeout is enabled for this interface */ 5317 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 5318 if (ifp->if_flags & IFF_DEBUG) 5319 printf("%s: no activity for %lu seconds\n", 5320 sp->pp_if.if_xname, 5321 (unsigned long)(now-sp->pp_last_activity)); 5322 lcp.Close(sp); 5323 SPPP_UNLOCK(sp); 5324 continue; 5325 } 5326 } 5327 5328 /* Keepalive mode disabled or channel down? */ 5329 if (! (sp->pp_flags & PP_KEEPALIVE) || 5330 ! (ifp->if_flags & IFF_RUNNING)) { 5331 SPPP_UNLOCK(sp); 5332 continue; 5333 } 5334 5335 5336 /* No keepalive in PPP mode if LCP not opened yet. */ 5337 if (! (sp->pp_flags & PP_CISCO) && 5338 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) { 5339 SPPP_UNLOCK(sp); 5340 continue; 5341 } 5342 5343 /* No echo reply, but maybe user data passed through? */ 5344 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 5345 sp->pp_alivecnt = 0; 5346 SPPP_UNLOCK(sp); 5347 continue; 5348 } 5349 5350 if (sp->pp_alivecnt >= sp->pp_maxalive) { 5351 /* No keepalive packets got. Stop the interface. */ 5352 SPPP_UNLOCK(sp); 5353 if_down (ifp); 5354 SPPP_LOCK(sp, RW_WRITER); 5355 5356 IF_PURGE(&sp->pp_cpq); 5357 5358 if (! (sp->pp_flags & PP_CISCO)) { 5359 printf("%s: LCP keepalive timed out, going to restart the connection\n", 5360 ifp->if_xname); 5361 sp->pp_alivecnt = 0; 5362 5363 /* we are down, close all open protocols */ 5364 lcp.Close(sp); 5365 5366 /* And now prepare LCP to reestablish the link, if configured to do so. */ 5367 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 5368 5369 /* Close connection immediately, completition of this 5370 * will summon the magic needed to reestablish it. */ 5371 sppp_notify_tlf_wlocked(sp); 5372 5373 SPPP_UNLOCK(sp); 5374 continue; 5375 } 5376 } 5377 if (sp->pp_alivecnt < sp->pp_maxalive) 5378 ++sp->pp_alivecnt; 5379 if (sp->pp_flags & PP_CISCO) 5380 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 5381 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 5382 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 5383 int32_t nmagic = htonl(sp->lcp.magic); 5384 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 5385 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 5386 sp->lcp.echoid, 4, &nmagic); 5387 } 5388 5389 SPPP_UNLOCK(sp); 5390 } 5391 splx(s); 5392 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 5393 5394 SPPPQ_UNLOCK(); 5395 } 5396 5397 #ifdef INET 5398 /* 5399 * Get both IP addresses. 5400 */ 5401 static void 5402 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 5403 { 5404 struct ifnet *ifp = &sp->pp_if; 5405 struct ifaddr *ifa; 5406 struct sockaddr_in *si, *sm; 5407 uint32_t ssrc, ddst; 5408 int s; 5409 struct psref psref; 5410 5411 sm = NULL; 5412 ssrc = ddst = 0; 5413 /* 5414 * Pick the first AF_INET address from the list, 5415 * aliases don't make any sense on a p2p link anyway. 5416 */ 5417 si = 0; 5418 s = pserialize_read_enter(); 5419 IFADDR_READER_FOREACH(ifa, ifp) { 5420 if (ifa->ifa_addr->sa_family == AF_INET) { 5421 si = (struct sockaddr_in *)ifa->ifa_addr; 5422 sm = (struct sockaddr_in *)ifa->ifa_netmask; 5423 if (si) { 5424 ifa_acquire(ifa, &psref); 5425 break; 5426 } 5427 } 5428 } 5429 pserialize_read_exit(s); 5430 if (ifa) { 5431 if (si && si->sin_addr.s_addr) { 5432 ssrc = si->sin_addr.s_addr; 5433 if (srcmask) 5434 *srcmask = ntohl(sm->sin_addr.s_addr); 5435 } 5436 5437 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 5438 if (si && si->sin_addr.s_addr) 5439 ddst = si->sin_addr.s_addr; 5440 ifa_release(ifa, &psref); 5441 } 5442 5443 if (dst) *dst = ntohl(ddst); 5444 if (src) *src = ntohl(ssrc); 5445 } 5446 5447 /* 5448 * Set IP addresses. Must be called at splnet. 5449 * If an address is 0, leave it the way it is. 5450 */ 5451 static void 5452 sppp_set_ip_addrs_work(struct work *wk, struct sppp *sp) 5453 { 5454 STDDCL; 5455 struct ifaddr *ifa; 5456 struct sockaddr_in *si, *dest; 5457 uint32_t myaddr = 0, hisaddr = 0; 5458 int s; 5459 5460 IFNET_LOCK(ifp); 5461 5462 /* 5463 * Pick the first AF_INET address from the list, 5464 * aliases don't make any sense on a p2p link anyway. 5465 */ 5466 si = dest = NULL; 5467 s = pserialize_read_enter(); 5468 IFADDR_READER_FOREACH(ifa, ifp) { 5469 if (ifa->ifa_addr->sa_family == AF_INET) { 5470 si = (struct sockaddr_in *)ifa->ifa_addr; 5471 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5472 break; 5473 } 5474 } 5475 pserialize_read_exit(s); 5476 5477 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 5478 myaddr = sp->ipcp.req_myaddr; 5479 else if (si != NULL) 5480 myaddr = ntohl(si->sin_addr.s_addr); 5481 5482 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 5483 hisaddr = sp->ipcp.req_hisaddr; 5484 else if (dest != NULL) 5485 hisaddr = ntohl(dest->sin_addr.s_addr); 5486 5487 if (si != NULL && dest != NULL) { 5488 int error; 5489 struct sockaddr_in new_sin = *si; 5490 struct sockaddr_in new_dst = *dest; 5491 5492 if (myaddr != 0) 5493 new_sin.sin_addr.s_addr = htonl(myaddr); 5494 if (hisaddr != 0) { 5495 new_dst.sin_addr.s_addr = htonl(hisaddr); 5496 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) 5497 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 5498 } 5499 5500 in_addrhash_remove(ifatoia(ifa)); 5501 5502 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5503 5504 in_addrhash_insert(ifatoia(ifa)); 5505 5506 if (debug && error) 5507 { 5508 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 5509 ifp->if_xname, __func__, error); 5510 } 5511 if (!error) { 5512 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5513 } 5514 } 5515 5516 if (ifp->if_mtu > sp->lcp.their_mru) { 5517 sp->pp_saved_mtu = ifp->if_mtu; 5518 ifp->if_mtu = sp->lcp.their_mru; 5519 if (debug) 5520 log(LOG_DEBUG, 5521 "%s: setting MTU to %" PRIu64 " bytes\n", 5522 ifp->if_xname, ifp->if_mtu); 5523 } 5524 5525 IFNET_UNLOCK(ifp); 5526 5527 sppp_notify_con(sp); 5528 } 5529 5530 static void 5531 sppp_set_ip_addrs(struct sppp *sp) 5532 { 5533 struct ifnet *ifp = &sp->pp_if; 5534 5535 if (!pcq_put(sp->ipcp.update_addrs_q, (void *)IPCP_SET_ADDRS)) { 5536 log(LOG_WARNING, "%s: cannot enqueued, ignore sppp_clear_ip_addrs\n", 5537 ifp->if_xname); 5538 return; 5539 } 5540 5541 if (atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1) == 1) 5542 return; 5543 5544 workqueue_enqueue(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk, NULL); 5545 } 5546 5547 /* 5548 * Clear IP addresses. Must be called at splnet. 5549 */ 5550 static void 5551 sppp_clear_ip_addrs_work(struct work *wk, struct sppp *sp) 5552 { 5553 STDDCL; 5554 struct ifaddr *ifa; 5555 struct sockaddr_in *si, *dest; 5556 int s; 5557 5558 IFNET_LOCK(ifp); 5559 5560 /* 5561 * Pick the first AF_INET address from the list, 5562 * aliases don't make any sense on a p2p link anyway. 5563 */ 5564 si = dest = NULL; 5565 s = pserialize_read_enter(); 5566 IFADDR_READER_FOREACH(ifa, ifp) { 5567 if (ifa->ifa_addr->sa_family == AF_INET) { 5568 si = (struct sockaddr_in *)ifa->ifa_addr; 5569 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5570 break; 5571 } 5572 } 5573 pserialize_read_exit(s); 5574 5575 if (si != NULL) { 5576 struct sockaddr_in new_sin = *si; 5577 struct sockaddr_in new_dst = *dest; 5578 int error; 5579 5580 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 5581 new_sin.sin_addr.s_addr = 0; 5582 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 5583 new_dst.sin_addr.s_addr = sp->ipcp.saved_hisaddr; 5584 5585 in_addrhash_remove(ifatoia(ifa)); 5586 5587 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5588 5589 in_addrhash_insert(ifatoia(ifa)); 5590 5591 if (debug && error) 5592 { 5593 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 5594 ifp->if_xname, __func__, error); 5595 } 5596 if (!error) { 5597 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5598 } 5599 } 5600 5601 if (sp->pp_saved_mtu > 0) { 5602 ifp->if_mtu = sp->pp_saved_mtu; 5603 sp->pp_saved_mtu = 0; 5604 if (debug) 5605 log(LOG_DEBUG, 5606 "%s: resetting MTU to %" PRIu64 " bytes\n", 5607 ifp->if_xname, ifp->if_mtu); 5608 } 5609 5610 IFNET_UNLOCK(ifp); 5611 } 5612 5613 static void 5614 sppp_clear_ip_addrs(struct sppp *sp) 5615 { 5616 struct ifnet *ifp = &sp->pp_if; 5617 5618 if (!pcq_put(sp->ipcp.update_addrs_q, (void *)IPCP_CLEAR_ADDRS)) { 5619 log(LOG_WARNING, "%s: cannot enqueued, ignore sppp_clear_ip_addrs\n", 5620 ifp->if_xname); 5621 return; 5622 } 5623 5624 if (atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1) == 1) 5625 return; 5626 5627 workqueue_enqueue(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk, NULL); 5628 } 5629 5630 static void 5631 sppp_update_ip_addrs_work(struct work *wk, void *arg) 5632 { 5633 struct sppp *sp = arg; 5634 void *work; 5635 5636 atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 0); 5637 5638 while ((work = pcq_get(sp->ipcp.update_addrs_q)) != NULL) { 5639 int update = (intptr_t)work; 5640 5641 if (update == IPCP_SET_ADDRS) 5642 sppp_set_ip_addrs_work(wk, sp); 5643 else if (update == IPCP_CLEAR_ADDRS) 5644 sppp_clear_ip_addrs_work(wk, sp); 5645 } 5646 } 5647 #endif 5648 5649 #ifdef INET6 5650 /* 5651 * Get both IPv6 addresses. 5652 */ 5653 static void 5654 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5655 struct in6_addr *srcmask) 5656 { 5657 struct ifnet *ifp = &sp->pp_if; 5658 struct ifaddr *ifa; 5659 struct sockaddr_in6 *si, *sm; 5660 struct in6_addr ssrc, ddst; 5661 int s; 5662 struct psref psref; 5663 5664 sm = NULL; 5665 memset(&ssrc, 0, sizeof(ssrc)); 5666 memset(&ddst, 0, sizeof(ddst)); 5667 /* 5668 * Pick the first link-local AF_INET6 address from the list, 5669 * aliases don't make any sense on a p2p link anyway. 5670 */ 5671 si = 0; 5672 s = pserialize_read_enter(); 5673 IFADDR_READER_FOREACH(ifa, ifp) { 5674 if (ifa->ifa_addr->sa_family == AF_INET6) { 5675 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5676 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5677 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) { 5678 ifa_acquire(ifa, &psref); 5679 break; 5680 } 5681 } 5682 } 5683 pserialize_read_exit(s); 5684 5685 if (ifa) { 5686 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5687 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5688 if (srcmask) { 5689 memcpy(srcmask, &sm->sin6_addr, 5690 sizeof(*srcmask)); 5691 } 5692 } 5693 5694 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5695 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5696 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5697 ifa_release(ifa, &psref); 5698 } 5699 5700 if (dst) 5701 memcpy(dst, &ddst, sizeof(*dst)); 5702 if (src) 5703 memcpy(src, &ssrc, sizeof(*src)); 5704 } 5705 5706 #ifdef IPV6CP_MYIFID_DYN 5707 /* 5708 * Generate random ifid. 5709 */ 5710 static void 5711 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5712 { 5713 /* TBD */ 5714 } 5715 5716 /* 5717 * Set my IPv6 address. Must be called at splnet. 5718 */ 5719 static void 5720 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5721 { 5722 STDDCL; 5723 struct ifaddr *ifa; 5724 struct sockaddr_in6 *sin6; 5725 int s; 5726 struct psref psref; 5727 5728 IFNET_LOCK(ifp); 5729 5730 /* 5731 * Pick the first link-local AF_INET6 address from the list, 5732 * aliases don't make any sense on a p2p link anyway. 5733 */ 5734 5735 sin6 = NULL; 5736 s = pserialize_read_enter(); 5737 IFADDR_READER_FOREACH(ifa, ifp) 5738 { 5739 if (ifa->ifa_addr->sa_family == AF_INET6) 5740 { 5741 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5742 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 5743 ifa_acquire(ifa, &psref); 5744 break; 5745 } 5746 } 5747 } 5748 pserialize_read_exit(s); 5749 5750 if (ifa && sin6) 5751 { 5752 int error; 5753 struct sockaddr_in6 new_sin6 = *sin6; 5754 5755 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5756 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5757 if (debug && error) 5758 { 5759 log(LOG_DEBUG, "%s: %s: in6_ifinit failed, error=%d\n", 5760 ifp->if_xname, __func__, error); 5761 } 5762 if (!error) { 5763 pfil_run_addrhooks(if_pfil, SIOCAIFADDR_IN6, ifa); 5764 } 5765 ifa_release(ifa, &psref); 5766 } 5767 5768 IFNET_UNLOCK(ifp); 5769 } 5770 #endif 5771 5772 /* 5773 * Suggest a candidate address to be used by peer. 5774 */ 5775 static void 5776 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5777 { 5778 struct in6_addr myaddr; 5779 struct timeval tv; 5780 5781 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5782 5783 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5784 microtime(&tv); 5785 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5786 myaddr.s6_addr[14] ^= 0xff; 5787 myaddr.s6_addr[15] ^= 0xff; 5788 } else { 5789 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5790 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5791 } 5792 if (suggest) 5793 memcpy(suggest, &myaddr, sizeof(myaddr)); 5794 } 5795 #endif /*INET6*/ 5796 5797 /* 5798 * Process ioctl requests specific to the PPP interface. 5799 * Permissions have already been checked. 5800 */ 5801 static int 5802 sppp_params(struct sppp *sp, u_long cmd, void *data) 5803 { 5804 switch (cmd) { 5805 case SPPPGETAUTHCFG: 5806 { 5807 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5808 int error; 5809 size_t len; 5810 5811 SPPP_LOCK(sp, RW_READER); 5812 5813 cfg->myauthflags = sp->myauth.flags; 5814 cfg->hisauthflags = sp->hisauth.flags; 5815 strlcpy(cfg->ifname, sp->pp_if.if_xname, sizeof(cfg->ifname)); 5816 cfg->hisauth = 0; 5817 if (sp->hisauth.proto) 5818 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5819 cfg->myauth = 0; 5820 if (sp->myauth.proto) 5821 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5822 if (cfg->myname_length == 0) { 5823 if (sp->myauth.name != NULL) 5824 cfg->myname_length = sp->myauth.name_len + 1; 5825 } else { 5826 if (sp->myauth.name == NULL) { 5827 cfg->myname_length = 0; 5828 } else { 5829 len = sp->myauth.name_len + 1; 5830 5831 5832 if (cfg->myname_length < len) { 5833 SPPP_UNLOCK(sp); 5834 return (ENAMETOOLONG); 5835 } 5836 error = copyout(sp->myauth.name, cfg->myname, len); 5837 if (error) { 5838 SPPP_UNLOCK(sp); 5839 return error; 5840 } 5841 } 5842 } 5843 if (cfg->hisname_length == 0) { 5844 if (sp->hisauth.name != NULL) 5845 cfg->hisname_length = sp->hisauth.name_len + 1; 5846 } else { 5847 if (sp->hisauth.name == NULL) { 5848 cfg->hisname_length = 0; 5849 } else { 5850 len = sp->hisauth.name_len + 1; 5851 5852 if (cfg->hisname_length < len) { 5853 SPPP_UNLOCK(sp); 5854 return (ENAMETOOLONG); 5855 } 5856 error = copyout(sp->hisauth.name, cfg->hisname, len); 5857 if (error) { 5858 SPPP_UNLOCK(sp); 5859 return error; 5860 } 5861 } 5862 } 5863 SPPP_UNLOCK(sp); 5864 } 5865 break; 5866 case SPPPSETAUTHCFG: 5867 { 5868 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5869 int error; 5870 5871 SPPP_LOCK(sp, RW_WRITER); 5872 5873 if (sp->myauth.name) { 5874 free(sp->myauth.name, M_DEVBUF); 5875 sp->myauth.name = NULL; 5876 } 5877 if (sp->myauth.secret) { 5878 free(sp->myauth.secret, M_DEVBUF); 5879 sp->myauth.secret = NULL; 5880 } 5881 if (sp->hisauth.name) { 5882 free(sp->hisauth.name, M_DEVBUF); 5883 sp->hisauth.name = NULL; 5884 } 5885 if (sp->hisauth.secret) { 5886 free(sp->hisauth.secret, M_DEVBUF); 5887 sp->hisauth.secret = NULL; 5888 } 5889 5890 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5891 if (cfg->hisname_length >= MCLBYTES) { 5892 SPPP_UNLOCK(sp); 5893 return (ENAMETOOLONG); 5894 } 5895 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5896 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5897 if (error) { 5898 free(sp->hisauth.name, M_DEVBUF); 5899 sp->hisauth.name = NULL; 5900 SPPP_UNLOCK(sp); 5901 return error; 5902 } 5903 sp->hisauth.name_len = cfg->hisname_length - 1; 5904 sp->hisauth.name[sp->hisauth.name_len] = 0; 5905 } 5906 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5907 if (cfg->hissecret_length >= MCLBYTES) { 5908 SPPP_UNLOCK(sp); 5909 return (ENAMETOOLONG); 5910 } 5911 sp->hisauth.secret = malloc(cfg->hissecret_length, 5912 M_DEVBUF, M_WAITOK); 5913 error = copyin(cfg->hissecret, sp->hisauth.secret, 5914 cfg->hissecret_length); 5915 if (error) { 5916 free(sp->hisauth.secret, M_DEVBUF); 5917 sp->hisauth.secret = NULL; 5918 SPPP_UNLOCK(sp); 5919 return error; 5920 } 5921 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5922 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5923 } 5924 if (cfg->myname != NULL && cfg->myname_length > 0) { 5925 if (cfg->myname_length >= MCLBYTES) { 5926 SPPP_UNLOCK(sp); 5927 return (ENAMETOOLONG); 5928 } 5929 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5930 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5931 if (error) { 5932 free(sp->myauth.name, M_DEVBUF); 5933 sp->myauth.name = NULL; 5934 SPPP_UNLOCK(sp); 5935 return error; 5936 } 5937 sp->myauth.name_len = cfg->myname_length - 1; 5938 sp->myauth.name[sp->myauth.name_len] = 0; 5939 } 5940 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5941 if (cfg->mysecret_length >= MCLBYTES) { 5942 SPPP_UNLOCK(sp); 5943 return (ENAMETOOLONG); 5944 } 5945 sp->myauth.secret = malloc(cfg->mysecret_length, 5946 M_DEVBUF, M_WAITOK); 5947 error = copyin(cfg->mysecret, sp->myauth.secret, 5948 cfg->mysecret_length); 5949 if (error) { 5950 free(sp->myauth.secret, M_DEVBUF); 5951 sp->myauth.secret = NULL; 5952 SPPP_UNLOCK(sp); 5953 return error; 5954 } 5955 sp->myauth.secret_len = cfg->mysecret_length - 1; 5956 sp->myauth.secret[sp->myauth.secret_len] = 0; 5957 } 5958 sp->myauth.flags = cfg->myauthflags; 5959 if (cfg->myauth) 5960 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5961 sp->hisauth.flags = cfg->hisauthflags; 5962 if (cfg->hisauth) 5963 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5964 sp->pp_auth_failures = 0; 5965 if (sp->hisauth.proto != 0) 5966 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5967 else 5968 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5969 5970 SPPP_UNLOCK(sp); 5971 } 5972 break; 5973 case SPPPGETLCPCFG: 5974 { 5975 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5976 5977 SPPP_LOCK(sp, RW_READER); 5978 lcpp->lcp_timeout = sp->lcp.timeout; 5979 SPPP_UNLOCK(sp); 5980 } 5981 break; 5982 case SPPPSETLCPCFG: 5983 { 5984 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5985 5986 SPPP_LOCK(sp, RW_WRITER); 5987 sp->lcp.timeout = lcpp->lcp_timeout; 5988 SPPP_UNLOCK(sp); 5989 } 5990 break; 5991 case SPPPGETSTATUS: 5992 { 5993 struct spppstatus *status = (struct spppstatus *)data; 5994 5995 SPPP_LOCK(sp, RW_READER); 5996 status->phase = sp->pp_phase; 5997 SPPP_UNLOCK(sp); 5998 } 5999 break; 6000 case SPPPGETSTATUSNCP: 6001 { 6002 struct spppstatusncp *status = (struct spppstatusncp *)data; 6003 6004 SPPP_LOCK(sp, RW_READER); 6005 status->phase = sp->pp_phase; 6006 status->ncpup = sppp_ncp_check(sp); 6007 SPPP_UNLOCK(sp); 6008 } 6009 break; 6010 case SPPPGETIDLETO: 6011 { 6012 struct spppidletimeout *to = (struct spppidletimeout *)data; 6013 6014 SPPP_LOCK(sp, RW_READER); 6015 to->idle_seconds = sp->pp_idle_timeout; 6016 SPPP_UNLOCK(sp); 6017 } 6018 break; 6019 case SPPPSETIDLETO: 6020 { 6021 struct spppidletimeout *to = (struct spppidletimeout *)data; 6022 6023 SPPP_LOCK(sp, RW_WRITER); 6024 sp->pp_idle_timeout = to->idle_seconds; 6025 SPPP_UNLOCK(sp); 6026 } 6027 break; 6028 case SPPPSETAUTHFAILURE: 6029 { 6030 struct spppauthfailuresettings *afsettings = 6031 (struct spppauthfailuresettings *)data; 6032 6033 SPPP_LOCK(sp, RW_WRITER); 6034 sp->pp_max_auth_fail = afsettings->max_failures; 6035 sp->pp_auth_failures = 0; 6036 SPPP_UNLOCK(sp); 6037 } 6038 break; 6039 case SPPPGETAUTHFAILURES: 6040 { 6041 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 6042 6043 SPPP_LOCK(sp, RW_READER); 6044 stats->auth_failures = sp->pp_auth_failures; 6045 stats->max_failures = sp->pp_max_auth_fail; 6046 SPPP_UNLOCK(sp); 6047 } 6048 break; 6049 case SPPPSETDNSOPTS: 6050 { 6051 struct spppdnssettings *req = (struct spppdnssettings *)data; 6052 6053 SPPP_LOCK(sp, RW_WRITER); 6054 sp->query_dns = req->query_dns & 3; 6055 SPPP_UNLOCK(sp); 6056 } 6057 break; 6058 case SPPPGETDNSOPTS: 6059 { 6060 struct spppdnssettings *req = (struct spppdnssettings *)data; 6061 6062 SPPP_LOCK(sp, RW_READER); 6063 req->query_dns = sp->query_dns; 6064 SPPP_UNLOCK(sp); 6065 } 6066 break; 6067 case SPPPGETDNSADDRS: 6068 { 6069 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 6070 6071 SPPP_LOCK(sp, RW_READER); 6072 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 6073 SPPP_UNLOCK(sp); 6074 } 6075 break; 6076 case SPPPGETKEEPALIVE: 6077 { 6078 struct spppkeepalivesettings *settings = 6079 (struct spppkeepalivesettings*)data; 6080 6081 SPPP_LOCK(sp, RW_READER); 6082 settings->maxalive = sp->pp_maxalive; 6083 settings->max_noreceive = sp->pp_max_noreceive; 6084 SPPP_UNLOCK(sp); 6085 } 6086 break; 6087 case SPPPSETKEEPALIVE: 6088 { 6089 struct spppkeepalivesettings *settings = 6090 (struct spppkeepalivesettings*)data; 6091 6092 SPPP_LOCK(sp, RW_WRITER); 6093 sp->pp_maxalive = settings->maxalive; 6094 sp->pp_max_noreceive = settings->max_noreceive; 6095 SPPP_UNLOCK(sp); 6096 } 6097 break; 6098 default: 6099 { 6100 int ret; 6101 6102 MODULE_HOOK_CALL(sppp_params_50_hook, (sp, cmd, data), 6103 enosys(), ret); 6104 if (ret != ENOSYS) 6105 return ret; 6106 return (EINVAL); 6107 } 6108 } 6109 return (0); 6110 } 6111 6112 static void 6113 sppp_phase_network(struct sppp *sp) 6114 { 6115 int i; 6116 uint32_t mask; 6117 6118 KASSERT(SPPP_WLOCKED(sp)); 6119 6120 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 6121 6122 /* Notify NCPs now. */ 6123 for (i = 0; i < IDX_COUNT; i++) 6124 if ((cps[i])->flags & CP_NCP) 6125 (cps[i])->Open(sp); 6126 6127 /* Send Up events to all NCPs. */ 6128 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 6129 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) { 6130 (cps[i])->Up(sp); 6131 } 6132 6133 /* if no NCP is starting, all this was in vain, close down */ 6134 sppp_lcp_check_and_close(sp); 6135 } 6136 6137 6138 static const char * 6139 sppp_cp_type_name(u_char type) 6140 { 6141 static char buf[12]; 6142 switch (type) { 6143 case CONF_REQ: return "conf-req"; 6144 case CONF_ACK: return "conf-ack"; 6145 case CONF_NAK: return "conf-nak"; 6146 case CONF_REJ: return "conf-rej"; 6147 case TERM_REQ: return "term-req"; 6148 case TERM_ACK: return "term-ack"; 6149 case CODE_REJ: return "code-rej"; 6150 case PROTO_REJ: return "proto-rej"; 6151 case ECHO_REQ: return "echo-req"; 6152 case ECHO_REPLY: return "echo-reply"; 6153 case DISC_REQ: return "discard-req"; 6154 } 6155 snprintf(buf, sizeof(buf), "0x%x", type); 6156 return buf; 6157 } 6158 6159 static const char * 6160 sppp_auth_type_name(u_short proto, u_char type) 6161 { 6162 static char buf[32]; 6163 const char *name; 6164 6165 switch (proto) { 6166 case PPP_CHAP: 6167 switch (type) { 6168 case CHAP_CHALLENGE: return "challenge"; 6169 case CHAP_RESPONSE: return "response"; 6170 case CHAP_SUCCESS: return "success"; 6171 case CHAP_FAILURE: return "failure"; 6172 default: name = "chap"; break; 6173 } 6174 break; 6175 6176 case PPP_PAP: 6177 switch (type) { 6178 case PAP_REQ: return "req"; 6179 case PAP_ACK: return "ack"; 6180 case PAP_NAK: return "nak"; 6181 default: name = "pap"; break; 6182 } 6183 break; 6184 6185 default: 6186 name = "bad"; 6187 break; 6188 } 6189 6190 snprintf(buf, sizeof(buf), "%s(%#x) %#x", name, proto, type); 6191 return buf; 6192 } 6193 6194 static const char * 6195 sppp_lcp_opt_name(u_char opt) 6196 { 6197 static char buf[12]; 6198 switch (opt) { 6199 case LCP_OPT_MRU: return "mru"; 6200 case LCP_OPT_ASYNC_MAP: return "async-map"; 6201 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 6202 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 6203 case LCP_OPT_MAGIC: return "magic"; 6204 case LCP_OPT_PROTO_COMP: return "proto-comp"; 6205 case LCP_OPT_ADDR_COMP: return "addr-comp"; 6206 case LCP_OPT_SELF_DESC_PAD: return "sdpad"; 6207 case LCP_OPT_CALL_BACK: return "callback"; 6208 case LCP_OPT_COMPOUND_FRMS: return "cmpd-frms"; 6209 case LCP_OPT_MP_MRRU: return "mrru"; 6210 case LCP_OPT_MP_SSNHF: return "mp-ssnhf"; 6211 case LCP_OPT_MP_EID: return "mp-eid"; 6212 } 6213 snprintf(buf, sizeof(buf), "0x%x", opt); 6214 return buf; 6215 } 6216 6217 static const char * 6218 sppp_ipcp_opt_name(u_char opt) 6219 { 6220 static char buf[12]; 6221 switch (opt) { 6222 case IPCP_OPT_ADDRESSES: return "addresses"; 6223 case IPCP_OPT_COMPRESSION: return "compression"; 6224 case IPCP_OPT_ADDRESS: return "address"; 6225 } 6226 snprintf(buf, sizeof(buf), "0x%x", opt); 6227 return buf; 6228 } 6229 6230 #ifdef INET6 6231 static const char * 6232 sppp_ipv6cp_opt_name(u_char opt) 6233 { 6234 static char buf[12]; 6235 switch (opt) { 6236 case IPV6CP_OPT_IFID: return "ifid"; 6237 case IPV6CP_OPT_COMPRESSION: return "compression"; 6238 } 6239 snprintf(buf, sizeof(buf), "0x%x", opt); 6240 return buf; 6241 } 6242 #endif 6243 6244 static const char * 6245 sppp_state_name(int state) 6246 { 6247 switch (state) { 6248 case STATE_INITIAL: return "initial"; 6249 case STATE_STARTING: return "starting"; 6250 case STATE_CLOSED: return "closed"; 6251 case STATE_STOPPED: return "stopped"; 6252 case STATE_CLOSING: return "closing"; 6253 case STATE_STOPPING: return "stopping"; 6254 case STATE_REQ_SENT: return "req-sent"; 6255 case STATE_ACK_RCVD: return "ack-rcvd"; 6256 case STATE_ACK_SENT: return "ack-sent"; 6257 case STATE_OPENED: return "opened"; 6258 } 6259 return "illegal"; 6260 } 6261 6262 static const char * 6263 sppp_phase_name(int phase) 6264 { 6265 switch (phase) { 6266 case SPPP_PHASE_DEAD: return "dead"; 6267 case SPPP_PHASE_ESTABLISH: return "establish"; 6268 case SPPP_PHASE_TERMINATE: return "terminate"; 6269 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 6270 case SPPP_PHASE_NETWORK: return "network"; 6271 } 6272 return "illegal"; 6273 } 6274 6275 static const char * 6276 sppp_proto_name(u_short proto) 6277 { 6278 static char buf[12]; 6279 switch (proto) { 6280 case PPP_LCP: return "lcp"; 6281 case PPP_IPCP: return "ipcp"; 6282 case PPP_PAP: return "pap"; 6283 case PPP_CHAP: return "chap"; 6284 case PPP_IPV6CP: return "ipv6cp"; 6285 } 6286 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 6287 return buf; 6288 } 6289 6290 static void 6291 sppp_print_bytes(const u_char *p, u_short len) 6292 { 6293 addlog(" %02x", *p++); 6294 while (--len > 0) 6295 addlog("-%02x", *p++); 6296 } 6297 6298 static void 6299 sppp_print_string(const char *p, u_short len) 6300 { 6301 u_char c; 6302 6303 while (len-- > 0) { 6304 c = *p++; 6305 /* 6306 * Print only ASCII chars directly. RFC 1994 recommends 6307 * using only them, but we don't rely on it. */ 6308 if (c < ' ' || c > '~') 6309 addlog("\\x%x", c); 6310 else 6311 addlog("%c", c); 6312 } 6313 } 6314 6315 static const char * 6316 sppp_dotted_quad(uint32_t addr) 6317 { 6318 static char s[16]; 6319 snprintf(s, sizeof(s), "%d.%d.%d.%d", 6320 (int)((addr >> 24) & 0xff), 6321 (int)((addr >> 16) & 0xff), 6322 (int)((addr >> 8) & 0xff), 6323 (int)(addr & 0xff)); 6324 return s; 6325 } 6326 6327 /* a dummy, used to drop uninteresting events */ 6328 static void 6329 sppp_null(struct sppp *unused) 6330 { 6331 /* do just nothing */ 6332 } 6333 /* 6334 * This file is large. Tell emacs to highlight it nevertheless. 6335 * 6336 * Local Variables: 6337 * hilit-auto-highlight-maxout: 120000 6338 * End: 6339 */ 6340 6341 /* 6342 * Module glue 6343 */ 6344 MODULE(MODULE_CLASS_MISC, sppp_subr, NULL); 6345 6346 static int 6347 sppp_subr_modcmd(modcmd_t cmd, void *arg) 6348 { 6349 switch (cmd) { 6350 case MODULE_CMD_INIT: 6351 case MODULE_CMD_FINI: 6352 return 0; 6353 case MODULE_CMD_STAT: 6354 case MODULE_CMD_AUTOUNLOAD: 6355 default: 6356 return ENOTTY; 6357 } 6358 } 6359 6360 static void 6361 sppp_notify_up(struct sppp *sp) 6362 { 6363 6364 SPPP_LOCK(sp, RW_WRITER); 6365 lcp.Up(sp); 6366 SPPP_UNLOCK(sp); 6367 } 6368 6369 static void 6370 sppp_notify_down(struct sppp *sp) 6371 { 6372 6373 SPPP_LOCK(sp, RW_WRITER); 6374 lcp.Down(sp); 6375 SPPP_UNLOCK(sp); 6376 } 6377 6378 static void 6379 sppp_notify_tls_wlocked(struct sppp *sp) 6380 { 6381 6382 KASSERT(SPPP_WLOCKED(sp)); 6383 6384 if (!sp->pp_tls) 6385 return; 6386 6387 SPPP_UNLOCK(sp); 6388 sp->pp_tls(sp); 6389 SPPP_LOCK(sp, RW_WRITER); 6390 } 6391 6392 static void 6393 sppp_notify_tlf_wlocked(struct sppp *sp) 6394 { 6395 6396 KASSERT(SPPP_WLOCKED(sp)); 6397 6398 if (!sp->pp_tlf) 6399 return; 6400 6401 SPPP_UNLOCK(sp); 6402 sp->pp_tlf(sp); 6403 SPPP_LOCK(sp, RW_WRITER); 6404 } 6405 6406 static void 6407 sppp_notify_con(struct sppp *sp) 6408 { 6409 6410 if (!sp->pp_con) 6411 return; 6412 6413 sp->pp_con(sp); 6414 } 6415 6416 #ifdef INET6 6417 static void 6418 sppp_notify_con_wlocked(struct sppp *sp) 6419 { 6420 6421 KASSERT(SPPP_WLOCKED(sp)); 6422 6423 SPPP_UNLOCK(sp); 6424 sppp_notify_con(sp); 6425 SPPP_LOCK(sp, RW_WRITER); 6426 6427 } 6428 #endif 6429 6430 static void 6431 sppp_notify_chg_wlocked(struct sppp *sp) 6432 { 6433 6434 KASSERT(SPPP_WLOCKED(sp)); 6435 6436 if (!sp->pp_chg) 6437 return; 6438 6439 SPPP_UNLOCK(sp); 6440 sp->pp_chg(sp, sp->pp_phase); 6441 SPPP_LOCK(sp, RW_WRITER); 6442 } 6443
Indexes created Thu Oct 16 14:10:15 GMT 2025