if_spppsubr.c revision 1.194
1 /* $NetBSD: if_spppsubr.c,v 1.194 2020/11/25 09:18:45 yamaguchi Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions are met: 18 * 1. Redistributions of source code must retain the above copyright notice, 19 * this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright notice, 21 * this list of conditions and the following disclaimer in the documentation 22 * and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 * 36 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 37 * 38 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 39 * 40 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.194 2020/11/25 09:18:45 yamaguchi Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_modular.h" 49 #include "opt_compat_netbsd.h" 50 #include "opt_net_mpsafe.h" 51 #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 *); 241 void (*Down)(struct sppp *); 242 void (*Open)(struct sppp *); 243 void (*Close)(struct sppp *); 244 void (*TO)(void *); 245 int (*RCR)(struct sppp *, struct lcp_header *, int); 246 void (*RCN_rej)(struct sppp *, struct lcp_header *, int); 247 void (*RCN_nak)(struct sppp *, struct lcp_header *, int); 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 void (*scan)(const struct cp *, struct sppp *); 255 }; 256 257 static struct sppp *spppq; 258 static kmutex_t *spppq_lock = NULL; 259 static callout_t keepalive_ch; 260 261 #define SPPPQ_LOCK() if (spppq_lock) \ 262 mutex_enter(spppq_lock); 263 #define SPPPQ_UNLOCK() if (spppq_lock) \ 264 mutex_exit(spppq_lock); 265 266 #define SPPP_LOCK(_sp, _op) rw_enter(&(_sp)->pp_lock, (_op)) 267 #define SPPP_UNLOCK(_sp) rw_exit(&(_sp)->pp_lock) 268 #define SPPP_WLOCKED(_sp) rw_write_held(&(_sp)->pp_lock) 269 #define SPPP_UPGRADE(_sp) do{ \ 270 SPPP_UNLOCK(_sp); \ 271 SPPP_LOCK(_sp, RW_WRITER); \ 272 }while (0) 273 #define SPPP_DOWNGRADE(_sp) rw_downgrade(&(_sp)->pp_lock) 274 275 #ifdef INET 276 #ifndef SPPPSUBR_MPSAFE 277 /* 278 * The following disgusting hack gets around the problem that IP TOS 279 * can't be set yet. We want to put "interactive" traffic on a high 280 * priority queue. To decide if traffic is interactive, we check that 281 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 282 * 283 * XXX is this really still necessary? - joerg - 284 */ 285 static u_short interactive_ports[8] = { 286 0, 513, 0, 0, 287 0, 21, 0, 23, 288 }; 289 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 290 #endif /* SPPPSUBR_MPSAFE */ 291 #endif 292 293 /* almost every function needs these */ 294 #define STDDCL \ 295 struct ifnet *ifp = &sp->pp_if; \ 296 int debug = ifp->if_flags & IFF_DEBUG 297 298 static int sppp_output(struct ifnet *, struct mbuf *, 299 const struct sockaddr *, const struct rtentry *); 300 301 static void sppp_cisco_send(struct sppp *, int, int32_t, int32_t); 302 static void sppp_cisco_input(struct sppp *, struct mbuf *); 303 304 static void sppp_cp_input(const struct cp *, struct sppp *, 305 struct mbuf *); 306 static void sppp_cp_send(struct sppp *, u_short, u_char, 307 u_char, u_short, void *); 308 /* static void sppp_cp_timeout(void *arg); */ 309 static void sppp_cp_change_state(const struct cp *, struct sppp *, int); 310 static void sppp_auth_send(const struct cp *, struct sppp *, 311 unsigned int, unsigned int, ...); 312 313 static void sppp_up_event(const struct cp *, struct sppp *); 314 static void sppp_down_event(const struct cp *, struct sppp *); 315 static void sppp_open_event(const struct cp *, struct sppp *); 316 static void sppp_close_event(const struct cp *, struct sppp *); 317 static void sppp_to_event(const struct cp *, struct sppp *); 318 static void sppp_rcr_event(const struct cp *, struct sppp *); 319 320 static void sppp_null(struct sppp *); 321 static void sppp_sca_scn(const struct cp *, struct sppp *); 322 323 static void sppp_lcp_init(struct sppp *); 324 static void sppp_lcp_up(struct sppp *); 325 static void sppp_lcp_down(struct sppp *); 326 static void sppp_lcp_open(struct sppp *); 327 static void sppp_lcp_close(struct sppp *); 328 static void sppp_lcp_TO(void *); 329 static int sppp_lcp_RCR(struct sppp *, struct lcp_header *, int); 330 static void sppp_lcp_RCN_rej(struct sppp *, struct lcp_header *, int); 331 static void sppp_lcp_RCN_nak(struct sppp *, struct lcp_header *, int); 332 static void sppp_lcp_tlu(struct sppp *); 333 static void sppp_lcp_tld(struct sppp *); 334 static void sppp_lcp_tls(struct sppp *); 335 static void sppp_lcp_tlf(struct sppp *); 336 static void sppp_lcp_scr(struct sppp *); 337 static void sppp_lcp_check_and_close(struct sppp *); 338 static int sppp_ncp_check(struct sppp *); 339 340 static void sppp_ipcp_init(struct sppp *); 341 static void sppp_ipcp_up(struct sppp *); 342 static void sppp_ipcp_down(struct sppp *); 343 static void sppp_ipcp_open(struct sppp *); 344 static void sppp_ipcp_close(struct sppp *); 345 static void sppp_ipcp_TO(void *); 346 static int sppp_ipcp_RCR(struct sppp *, struct lcp_header *, int); 347 static void sppp_ipcp_RCN_rej(struct sppp *, struct lcp_header *, int); 348 static void sppp_ipcp_RCN_nak(struct sppp *, struct lcp_header *, int); 349 static void sppp_ipcp_tlu(struct sppp *); 350 static void sppp_ipcp_tld(struct sppp *); 351 static void sppp_ipcp_tls(struct sppp *); 352 static void sppp_ipcp_tlf(struct sppp *); 353 static void sppp_ipcp_scr(struct sppp *); 354 355 static void sppp_ipv6cp_init(struct sppp *); 356 static void sppp_ipv6cp_up(struct sppp *); 357 static void sppp_ipv6cp_down(struct sppp *); 358 static void sppp_ipv6cp_open(struct sppp *); 359 static void sppp_ipv6cp_close(struct sppp *); 360 static void sppp_ipv6cp_TO(void *); 361 static int sppp_ipv6cp_RCR(struct sppp *, struct lcp_header *, int); 362 static void sppp_ipv6cp_RCN_rej(struct sppp *, struct lcp_header *, int); 363 static void sppp_ipv6cp_RCN_nak(struct sppp *, struct lcp_header *, int); 364 static void sppp_ipv6cp_tlu(struct sppp *); 365 static void sppp_ipv6cp_tld(struct sppp *); 366 static void sppp_ipv6cp_tls(struct sppp *); 367 static void sppp_ipv6cp_tlf(struct sppp *); 368 static void sppp_ipv6cp_scr(struct sppp *); 369 370 static void sppp_pap_input(struct sppp *, struct mbuf *); 371 static void sppp_pap_init(struct sppp *); 372 static void sppp_pap_open(struct sppp *); 373 static void sppp_pap_close(struct sppp *); 374 static void sppp_pap_TO(void *); 375 static void sppp_pap_my_TO(void *); 376 static void sppp_pap_tlu(struct sppp *); 377 static void sppp_pap_tld(struct sppp *); 378 static void sppp_pap_scr(struct sppp *); 379 380 static void sppp_chap_input(struct sppp *, struct mbuf *); 381 static void sppp_chap_init(struct sppp *); 382 static void sppp_chap_open(struct sppp *); 383 static void sppp_chap_close(struct sppp *); 384 static void sppp_chap_TO(void *); 385 static void sppp_chap_tlu(struct sppp *); 386 static void sppp_chap_tld(struct sppp *); 387 static void sppp_chap_scr(struct sppp *); 388 389 static const char *sppp_auth_type_name(u_short, u_char); 390 static const char *sppp_cp_type_name(u_char); 391 static const char *sppp_dotted_quad(uint32_t); 392 static const char *sppp_ipcp_opt_name(u_char); 393 #ifdef INET6 394 static const char *sppp_ipv6cp_opt_name(u_char); 395 #endif 396 static const char *sppp_lcp_opt_name(u_char); 397 static const char *sppp_phase_name(int); 398 static const char *sppp_proto_name(u_short); 399 static const char *sppp_state_name(int); 400 static int sppp_params(struct sppp *, u_long, void *); 401 #ifdef INET 402 static void sppp_get_ip_addrs(struct sppp *, uint32_t *, uint32_t *, uint32_t *); 403 static void sppp_set_ip_addrs_work(struct work *, struct sppp *); 404 static void sppp_set_ip_addrs(struct sppp *); 405 static void sppp_clear_ip_addrs_work(struct work *, struct sppp *); 406 static void sppp_clear_ip_addrs(struct sppp *); 407 static void sppp_update_ip_addrs_work(struct work *, void *); 408 #endif 409 static void sppp_keepalive(void *); 410 static void sppp_phase_network(struct sppp *); 411 static void sppp_print_bytes(const u_char *, u_short); 412 static void sppp_print_string(const char *, u_short); 413 #ifdef INET6 414 static void sppp_get_ip6_addrs(struct sppp *, struct in6_addr *, 415 struct in6_addr *, struct in6_addr *); 416 #ifdef IPV6CP_MYIFID_DYN 417 static void sppp_set_ip6_addr(struct sppp *, const struct in6_addr *); 418 static void sppp_gen_ip6_addr(struct sppp *, const struct in6_addr *); 419 #endif 420 static void sppp_suggest_ip6_addr(struct sppp *, struct in6_addr *); 421 #endif 422 423 static void sppp_notify_up(struct sppp *); 424 static void sppp_notify_down(struct sppp *); 425 static void sppp_notify_tls_wlocked(struct sppp *); 426 static void sppp_notify_tlf_wlocked(struct sppp *); 427 #ifdef INET6 428 static void sppp_notify_con_wlocked(struct sppp *); 429 #endif 430 static void sppp_notify_con(struct sppp *); 431 432 static void sppp_notify_chg_wlocked(struct sppp *); 433 434 435 /* our control protocol descriptors */ 436 static const struct cp lcp = { 437 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 438 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 439 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 440 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 441 sppp_lcp_scr, sppp_sca_scn 442 }; 443 444 static const struct cp ipcp = { 445 PPP_IPCP, IDX_IPCP, 446 #ifdef INET 447 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 448 #else 449 0, 450 #endif 451 "ipcp", 452 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 453 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 454 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 455 sppp_ipcp_scr, sppp_sca_scn 456 }; 457 458 static const struct cp ipv6cp = { 459 PPP_IPV6CP, IDX_IPV6CP, 460 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 461 CP_NCP, 462 #else 463 0, 464 #endif 465 "ipv6cp", 466 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 467 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 468 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 469 sppp_ipv6cp_scr, sppp_sca_scn 470 }; 471 472 static const struct cp pap = { 473 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 474 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 475 sppp_pap_TO, 0, 0, 0, 476 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 477 sppp_pap_scr, 0 478 }; 479 480 static const struct cp chap = { 481 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 482 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 483 sppp_chap_TO, 0, 0, 0, 484 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 485 sppp_chap_scr, 0 486 }; 487 488 static const struct cp *cps[IDX_COUNT] = { 489 &lcp, /* IDX_LCP */ 490 &ipcp, /* IDX_IPCP */ 491 &ipv6cp, /* IDX_IPV6CP */ 492 &pap, /* IDX_PAP */ 493 &chap, /* IDX_CHAP */ 494 }; 495 496 static void 497 sppp_change_phase(struct sppp *sp, int phase) 498 { 499 STDDCL; 500 501 KASSERT(SPPP_WLOCKED(sp)); 502 503 if (sp->pp_phase == phase) 504 return; 505 506 sp->pp_phase = phase; 507 508 if (phase == SPPP_PHASE_NETWORK) 509 if_link_state_change(ifp, LINK_STATE_UP); 510 else 511 if_link_state_change(ifp, LINK_STATE_DOWN); 512 513 if (debug) 514 { 515 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 516 sppp_phase_name(sp->pp_phase)); 517 } 518 } 519 520 /* 521 * Exported functions, comprising our interface to the lower layer. 522 */ 523 524 /* 525 * Process the received packet. 526 */ 527 void 528 sppp_input(struct ifnet *ifp, struct mbuf *m) 529 { 530 struct ppp_header *h = NULL; 531 pktqueue_t *pktq = NULL; 532 struct ifqueue *inq = NULL; 533 uint16_t protocol; 534 struct sppp *sp = (struct sppp *)ifp; 535 int debug = ifp->if_flags & IFF_DEBUG; 536 int isr = 0; 537 538 SPPP_LOCK(sp, RW_READER); 539 540 if (ifp->if_flags & IFF_UP) { 541 /* Count received bytes, add hardware framing */ 542 if_statadd(ifp, if_ibytes, m->m_pkthdr.len + sp->pp_framebytes); 543 /* Note time of last receive */ 544 sp->pp_last_receive = time_uptime; 545 } 546 547 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 548 /* Too small packet, drop it. */ 549 if (debug) 550 log(LOG_DEBUG, 551 "%s: input packet is too small, %d bytes\n", 552 ifp->if_xname, m->m_pkthdr.len); 553 drop: 554 if_statadd2(ifp, if_ierrors, 1, if_iqdrops, 1); 555 m_freem(m); 556 SPPP_UNLOCK(sp); 557 return; 558 } 559 560 if (sp->pp_flags & PP_NOFRAMING) { 561 memcpy(&protocol, mtod(m, void *), 2); 562 protocol = ntohs(protocol); 563 m_adj(m, 2); 564 } else { 565 566 /* Get PPP header. */ 567 h = mtod(m, struct ppp_header *); 568 m_adj(m, PPP_HEADER_LEN); 569 570 switch (h->address) { 571 case PPP_ALLSTATIONS: 572 if (h->control != PPP_UI) 573 goto invalid; 574 if (sp->pp_flags & PP_CISCO) { 575 if (debug) 576 log(LOG_DEBUG, 577 "%s: PPP packet in Cisco mode " 578 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 579 ifp->if_xname, 580 h->address, h->control, ntohs(h->protocol)); 581 goto drop; 582 } 583 break; 584 case CISCO_MULTICAST: 585 case CISCO_UNICAST: 586 /* Don't check the control field here (RFC 1547). */ 587 if (! (sp->pp_flags & PP_CISCO)) { 588 if (debug) 589 log(LOG_DEBUG, 590 "%s: Cisco packet in PPP mode " 591 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 592 ifp->if_xname, 593 h->address, h->control, ntohs(h->protocol)); 594 goto drop; 595 } 596 switch (ntohs(h->protocol)) { 597 default: 598 if_statinc(ifp, if_noproto); 599 goto invalid; 600 case CISCO_KEEPALIVE: 601 SPPP_UNLOCK(sp); 602 sppp_cisco_input((struct sppp *) ifp, m); 603 m_freem(m); 604 return; 605 #ifdef INET 606 case ETHERTYPE_IP: 607 pktq = ip_pktq; 608 break; 609 #endif 610 #ifdef INET6 611 case ETHERTYPE_IPV6: 612 pktq = ip6_pktq; 613 break; 614 #endif 615 } 616 goto queue_pkt; 617 default: /* Invalid PPP packet. */ 618 invalid: 619 if (debug) 620 log(LOG_DEBUG, 621 "%s: invalid input packet " 622 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 623 ifp->if_xname, 624 h->address, h->control, ntohs(h->protocol)); 625 goto drop; 626 } 627 protocol = ntohs(h->protocol); 628 } 629 630 switch (protocol) { 631 default: 632 if (sp->scp[IDX_LCP].state == STATE_OPENED) { 633 uint16_t prot = htons(protocol); 634 635 SPPP_UPGRADE(sp); 636 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 637 ++sp->scp[IDX_LCP].seq, m->m_pkthdr.len + 2, 638 &prot); 639 SPPP_DOWNGRADE(sp); 640 } 641 if (debug) 642 log(LOG_DEBUG, 643 "%s: invalid input protocol " 644 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 645 if_statinc(ifp, if_noproto); 646 goto drop; 647 case PPP_LCP: 648 SPPP_UNLOCK(sp); 649 sppp_cp_input(&lcp, sp, m); 650 m_freem(m); 651 return; 652 case PPP_PAP: 653 SPPP_UNLOCK(sp); 654 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 655 sppp_pap_input(sp, m); 656 } 657 m_freem(m); 658 return; 659 case PPP_CHAP: 660 SPPP_UNLOCK(sp); 661 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 662 sppp_chap_input(sp, m); 663 } 664 m_freem(m); 665 return; 666 #ifdef INET 667 case PPP_IPCP: 668 SPPP_UNLOCK(sp); 669 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 670 sppp_cp_input(&ipcp, sp, m); 671 } 672 m_freem(m); 673 return; 674 case PPP_IP: 675 if (sp->scp[IDX_IPCP].state == STATE_OPENED) { 676 sp->pp_last_activity = time_uptime; 677 pktq = ip_pktq; 678 } 679 break; 680 #endif 681 #ifdef INET6 682 case PPP_IPV6CP: 683 SPPP_UNLOCK(sp); 684 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 685 sppp_cp_input(&ipv6cp, sp, m); 686 } 687 m_freem(m); 688 return; 689 690 case PPP_IPV6: 691 if (sp->scp[IDX_IPV6CP].state == STATE_OPENED) { 692 sp->pp_last_activity = time_uptime; 693 pktq = ip6_pktq; 694 } 695 break; 696 #endif 697 } 698 699 queue_pkt: 700 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 701 goto drop; 702 } 703 704 /* Check queue. */ 705 if (__predict_true(pktq)) { 706 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 707 goto drop; 708 } 709 SPPP_UNLOCK(sp); 710 return; 711 } 712 713 SPPP_UNLOCK(sp); 714 715 IFQ_LOCK(inq); 716 if (IF_QFULL(inq)) { 717 /* Queue overflow. */ 718 IF_DROP(inq); 719 IFQ_UNLOCK(inq); 720 if (debug) 721 log(LOG_DEBUG, "%s: protocol queue overflow\n", 722 ifp->if_xname); 723 724 SPPP_LOCK(sp, RW_READER); 725 goto drop; 726 } 727 IF_ENQUEUE(inq, m); 728 IFQ_UNLOCK(inq); 729 schednetisr(isr); 730 } 731 732 /* 733 * Enqueue transmit packet. 734 */ 735 static int 736 sppp_output(struct ifnet *ifp, struct mbuf *m, 737 const struct sockaddr *dst, const struct rtentry *rt) 738 { 739 struct sppp *sp = (struct sppp *) ifp; 740 struct ppp_header *h = NULL; 741 #ifndef SPPPSUBR_MPSAFE 742 struct ifqueue *ifq = NULL; /* XXX */ 743 #endif 744 int s, error = 0; 745 uint16_t protocol; 746 size_t pktlen; 747 748 s = splnet(); 749 SPPP_LOCK(sp, RW_READER); 750 751 sp->pp_last_activity = time_uptime; 752 753 if ((ifp->if_flags & IFF_UP) == 0 || 754 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 755 SPPP_UNLOCK(sp); 756 splx(s); 757 758 m_freem(m); 759 760 return (ENETDOWN); 761 } 762 763 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 764 /* 765 * Interface is not yet running, but auto-dial. Need 766 * to start LCP for it. 767 */ 768 ifp->if_flags |= IFF_RUNNING; 769 770 SPPP_UNLOCK(sp); 771 splx(s); 772 773 SPPP_LOCK(sp, RW_WRITER); 774 lcp.Open(sp); 775 SPPP_UNLOCK(sp); 776 777 s = splnet(); 778 SPPP_LOCK(sp, RW_READER); 779 } 780 781 /* 782 * If the queueing discipline needs packet classification, 783 * do it before prepending link headers. 784 */ 785 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 786 787 #ifdef INET 788 if (dst->sa_family == AF_INET) { 789 struct ip *ip = NULL; 790 #ifndef SPPPSUBR_MPSAFE 791 struct tcphdr *th = NULL; 792 #endif 793 794 if (m->m_len >= sizeof(struct ip)) { 795 ip = mtod(m, struct ip *); 796 #ifndef SPPPSUBR_MPSAFE 797 if (ip->ip_p == IPPROTO_TCP && 798 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 799 sizeof(struct tcphdr)) { 800 th = (struct tcphdr *) 801 ((char *)ip + (ip->ip_hl << 2)); 802 } 803 #endif 804 } else 805 ip = NULL; 806 807 /* 808 * When using dynamic local IP address assignment by using 809 * 0.0.0.0 as a local address, the first TCP session will 810 * not connect because the local TCP checksum is computed 811 * using 0.0.0.0 which will later become our real IP address 812 * so the TCP checksum computed at the remote end will 813 * become invalid. So we 814 * - don't let packets with src ip addr 0 thru 815 * - we flag TCP packets with src ip 0 as an error 816 */ 817 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 818 uint8_t proto = ip->ip_p; 819 820 SPPP_UNLOCK(sp); 821 splx(s); 822 823 m_freem(m); 824 if (proto == IPPROTO_TCP) 825 return (EADDRNOTAVAIL); 826 else 827 return (0); 828 } 829 830 #ifndef SPPPSUBR_MPSAFE 831 /* 832 * Put low delay, telnet, rlogin and ftp control packets 833 * in front of the queue. 834 */ 835 if (!IF_QFULL(&sp->pp_fastq) && 836 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 837 (th && (INTERACTIVE(ntohs(th->th_sport)) || 838 INTERACTIVE(ntohs(th->th_dport)))))) 839 ifq = &sp->pp_fastq; 840 #endif /* !SPPPSUBR_MPSAFE */ 841 } 842 #endif 843 844 #ifdef INET6 845 if (dst->sa_family == AF_INET6) { 846 /* XXX do something tricky here? */ 847 } 848 #endif 849 850 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 851 /* 852 * Prepend general data packet PPP header. For now, IP only. 853 */ 854 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 855 if (! m) { 856 if (ifp->if_flags & IFF_DEBUG) 857 log(LOG_DEBUG, "%s: no memory for transmit header\n", 858 ifp->if_xname); 859 if_statinc(ifp, if_oerrors); 860 SPPP_UNLOCK(sp); 861 splx(s); 862 return (ENOBUFS); 863 } 864 /* 865 * May want to check size of packet 866 * (albeit due to the implementation it's always enough) 867 */ 868 h = mtod(m, struct ppp_header *); 869 if (sp->pp_flags & PP_CISCO) { 870 h->address = CISCO_UNICAST; /* unicast address */ 871 h->control = 0; 872 } else { 873 h->address = PPP_ALLSTATIONS; /* broadcast address */ 874 h->control = PPP_UI; /* Unnumbered Info */ 875 } 876 } 877 878 switch (dst->sa_family) { 879 #ifdef INET 880 case AF_INET: /* Internet Protocol */ 881 if (sp->pp_flags & PP_CISCO) 882 protocol = htons(ETHERTYPE_IP); 883 else { 884 /* 885 * Don't choke with an ENETDOWN early. It's 886 * possible that we just started dialing out, 887 * so don't drop the packet immediately. If 888 * we notice that we run out of buffer space 889 * below, we will however remember that we are 890 * not ready to carry IP packets, and return 891 * ENETDOWN, as opposed to ENOBUFS. 892 */ 893 protocol = htons(PPP_IP); 894 if (sp->scp[IDX_IPCP].state != STATE_OPENED) 895 error = ENETDOWN; 896 } 897 break; 898 #endif 899 #ifdef INET6 900 case AF_INET6: /* Internet Protocol version 6 */ 901 if (sp->pp_flags & PP_CISCO) 902 protocol = htons(ETHERTYPE_IPV6); 903 else { 904 /* 905 * Don't choke with an ENETDOWN early. It's 906 * possible that we just started dialing out, 907 * so don't drop the packet immediately. If 908 * we notice that we run out of buffer space 909 * below, we will however remember that we are 910 * not ready to carry IP packets, and return 911 * ENETDOWN, as opposed to ENOBUFS. 912 */ 913 protocol = htons(PPP_IPV6); 914 if (sp->scp[IDX_IPV6CP].state != STATE_OPENED) 915 error = ENETDOWN; 916 } 917 break; 918 #endif 919 default: 920 m_freem(m); 921 if_statinc(ifp, if_oerrors); 922 SPPP_UNLOCK(sp); 923 splx(s); 924 return (EAFNOSUPPORT); 925 } 926 927 if (sp->pp_flags & PP_NOFRAMING) { 928 M_PREPEND(m, 2, M_DONTWAIT); 929 if (m == NULL) { 930 if (ifp->if_flags & IFF_DEBUG) 931 log(LOG_DEBUG, "%s: no memory for transmit header\n", 932 ifp->if_xname); 933 if_statinc(ifp, if_oerrors); 934 SPPP_UNLOCK(sp); 935 splx(s); 936 return (ENOBUFS); 937 } 938 *mtod(m, uint16_t *) = protocol; 939 } else { 940 h->protocol = protocol; 941 } 942 943 pktlen = m->m_pkthdr.len; 944 #ifdef SPPPSUBR_MPSAFE 945 SPPP_UNLOCK(sp); 946 error = if_transmit_lock(ifp, m); 947 SPPP_LOCK(sp, RW_READER); 948 if (error == 0) 949 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 950 #else /* !SPPPSUBR_MPSAFE */ 951 error = ifq_enqueue2(ifp, ifq, m); 952 953 if (error == 0) { 954 /* 955 * Count output packets and bytes. 956 * The packet length includes header + additional hardware 957 * framing according to RFC 1333. 958 */ 959 if (!(ifp->if_flags & IFF_OACTIVE)) { 960 SPPP_UNLOCK(sp); 961 if_start_lock(ifp); 962 SPPP_LOCK(sp, RW_READER); 963 } 964 if_statadd(ifp, if_obytes, pktlen + sp->pp_framebytes); 965 } 966 #endif /* !SPPPSUBR_MPSAFE */ 967 SPPP_UNLOCK(sp); 968 splx(s); 969 return error; 970 } 971 972 void 973 sppp_attach(struct ifnet *ifp) 974 { 975 struct sppp *sp = (struct sppp *) ifp; 976 977 /* Initialize keepalive handler. */ 978 if (! spppq) { 979 callout_init(&keepalive_ch, CALLOUT_MPSAFE); 980 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 981 } 982 983 if (! spppq_lock) 984 spppq_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 985 986 /* Insert new entry into the keepalive list. */ 987 sp->pp_next = spppq; 988 spppq = sp; 989 990 sp->pp_if.if_type = IFT_PPP; 991 sp->pp_if.if_output = sppp_output; 992 sp->pp_fastq.ifq_maxlen = 32; 993 sp->pp_cpq.ifq_maxlen = 20; 994 sp->pp_loopcnt = 0; 995 sp->pp_alivecnt = 0; 996 sp->pp_last_activity = 0; 997 sp->pp_last_receive = 0; 998 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 999 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 1000 sp->pp_idle_timeout = 0; 1001 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 1002 sp->pp_phase = SPPP_PHASE_DEAD; 1003 sp->pp_up = sppp_notify_up; 1004 sp->pp_down = sppp_notify_down; 1005 memset(sp->scp, 0, sizeof(sp->scp)); 1006 rw_init(&sp->pp_lock); 1007 1008 if_alloc_sadl(ifp); 1009 1010 /* Lets not beat about the bush, we know we're down. */ 1011 ifp->if_link_state = LINK_STATE_DOWN; 1012 1013 memset(&sp->myauth, 0, sizeof sp->myauth); 1014 memset(&sp->hisauth, 0, sizeof sp->hisauth); 1015 SPPP_LOCK(sp, RW_WRITER); 1016 sppp_lcp_init(sp); 1017 sppp_ipcp_init(sp); 1018 sppp_ipv6cp_init(sp); 1019 sppp_pap_init(sp); 1020 sppp_chap_init(sp); 1021 SPPP_UNLOCK(sp); 1022 } 1023 1024 void 1025 sppp_detach(struct ifnet *ifp) 1026 { 1027 struct sppp **q, *p, *sp = (struct sppp *) ifp; 1028 1029 /* Remove the entry from the keepalive list. */ 1030 SPPPQ_LOCK(); 1031 for (q = &spppq; (p = *q); q = &p->pp_next) 1032 if (p == sp) { 1033 *q = p->pp_next; 1034 break; 1035 } 1036 SPPPQ_UNLOCK(); 1037 1038 if (! spppq) { 1039 /* Stop keepalive handler. */ 1040 callout_stop(&keepalive_ch); 1041 mutex_obj_free(spppq_lock); 1042 spppq_lock = NULL; 1043 } 1044 1045 SPPP_LOCK(sp, RW_WRITER); 1046 1047 /* to avoid workqueue enqueued */ 1048 atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1); 1049 workqueue_wait(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk); 1050 workqueue_destroy(sp->ipcp.update_addrs_wq); 1051 pcq_destroy(sp->ipcp.update_addrs_q); 1052 1053 callout_stop(&sp->scp[IDX_LCP].ch); 1054 callout_stop(&sp->scp[IDX_IPCP].ch); 1055 callout_stop(&sp->scp[IDX_PAP].ch); 1056 callout_stop(&sp->scp[IDX_CHAP].ch); 1057 #ifdef INET6 1058 callout_stop(&sp->scp[IDX_IPV6CP].ch); 1059 #endif 1060 callout_stop(&sp->pap_my_to_ch); 1061 1062 /* free authentication info */ 1063 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 1064 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 1065 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 1066 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 1067 SPPP_UNLOCK(sp); 1068 rw_destroy(&sp->pp_lock); 1069 } 1070 1071 /* 1072 * Flush the interface output queue. 1073 */ 1074 void 1075 sppp_flush(struct ifnet *ifp) 1076 { 1077 struct sppp *sp = (struct sppp *) ifp; 1078 1079 SPPP_LOCK(sp, RW_WRITER); 1080 IFQ_PURGE(&sp->pp_if.if_snd); 1081 IF_PURGE(&sp->pp_fastq); 1082 IF_PURGE(&sp->pp_cpq); 1083 SPPP_UNLOCK(sp); 1084 } 1085 1086 /* 1087 * Check if the output queue is empty. 1088 */ 1089 int 1090 sppp_isempty(struct ifnet *ifp) 1091 { 1092 struct sppp *sp = (struct sppp *) ifp; 1093 int empty, s; 1094 1095 s = splnet(); 1096 SPPP_LOCK(sp, RW_READER); 1097 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1098 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1099 SPPP_UNLOCK(sp); 1100 splx(s); 1101 return (empty); 1102 } 1103 1104 /* 1105 * Get next packet to send. 1106 */ 1107 struct mbuf * 1108 sppp_dequeue(struct ifnet *ifp) 1109 { 1110 struct sppp *sp = (struct sppp *) ifp; 1111 struct mbuf *m; 1112 int s; 1113 1114 s = splnet(); 1115 SPPP_LOCK(sp, RW_WRITER); 1116 /* 1117 * Process only the control protocol queue until we have at 1118 * least one NCP open. 1119 * 1120 * Do always serve all three queues in Cisco mode. 1121 */ 1122 IF_DEQUEUE(&sp->pp_cpq, m); 1123 if (m == NULL && 1124 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1125 IF_DEQUEUE(&sp->pp_fastq, m); 1126 if (m == NULL) 1127 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1128 } 1129 SPPP_UNLOCK(sp); 1130 splx(s); 1131 return m; 1132 } 1133 1134 /* 1135 * Process an ioctl request. Called on low priority level. 1136 */ 1137 int 1138 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1139 { 1140 struct lwp *l = curlwp; /* XXX */ 1141 struct ifreq *ifr = (struct ifreq *) data; 1142 struct ifaddr *ifa = (struct ifaddr *) data; 1143 struct sppp *sp = (struct sppp *) ifp; 1144 int s, error=0, going_up, going_down; 1145 u_short newmode; 1146 1147 s = splnet(); 1148 switch (cmd) { 1149 case SIOCINITIFADDR: 1150 ifa->ifa_rtrequest = p2p_rtrequest; 1151 break; 1152 1153 case SIOCSIFFLAGS: 1154 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1155 break; 1156 1157 SPPP_LOCK(sp, RW_WRITER); 1158 going_up = ifp->if_flags & IFF_UP && 1159 (ifp->if_flags & IFF_RUNNING) == 0; 1160 going_down = (ifp->if_flags & IFF_UP) == 0 && 1161 ifp->if_flags & IFF_RUNNING; 1162 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1163 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1164 /* sanity */ 1165 newmode = IFF_PASSIVE; 1166 ifp->if_flags &= ~IFF_AUTO; 1167 } 1168 1169 if (going_up || going_down) { 1170 lcp.Close(sp); 1171 } 1172 if (going_up && newmode == 0) { 1173 /* neither auto-dial nor passive */ 1174 ifp->if_flags |= IFF_RUNNING; 1175 if (!(sp->pp_flags & PP_CISCO)) 1176 lcp.Open(sp); 1177 } else if (going_down) { 1178 SPPP_UNLOCK(sp); 1179 sppp_flush(ifp); 1180 SPPP_LOCK(sp, RW_WRITER); 1181 1182 ifp->if_flags &= ~IFF_RUNNING; 1183 } 1184 SPPP_UNLOCK(sp); 1185 break; 1186 1187 case SIOCSIFMTU: 1188 if (ifr->ifr_mtu < PPP_MINMRU || 1189 ifr->ifr_mtu > sp->lcp.their_mru) { 1190 error = EINVAL; 1191 break; 1192 } 1193 /*FALLTHROUGH*/ 1194 case SIOCGIFMTU: 1195 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1196 error = 0; 1197 break; 1198 case SIOCADDMULTI: 1199 case SIOCDELMULTI: 1200 break; 1201 1202 case SPPPSETAUTHCFG: 1203 case SPPPSETLCPCFG: 1204 case SPPPSETIDLETO: 1205 case SPPPSETAUTHFAILURE: 1206 case SPPPSETDNSOPTS: 1207 case SPPPSETKEEPALIVE: 1208 #if defined(COMPAT_50) || defined(MODULAR) 1209 case __SPPPSETIDLETO50: 1210 case __SPPPSETKEEPALIVE50: 1211 #endif /* COMPAT_50 || MODULAR */ 1212 error = kauth_authorize_network(l->l_cred, 1213 KAUTH_NETWORK_INTERFACE, 1214 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1215 NULL); 1216 if (error) 1217 break; 1218 error = sppp_params(sp, cmd, data); 1219 break; 1220 1221 case SPPPGETAUTHCFG: 1222 case SPPPGETLCPCFG: 1223 case SPPPGETAUTHFAILURES: 1224 error = kauth_authorize_network(l->l_cred, 1225 KAUTH_NETWORK_INTERFACE, 1226 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1227 NULL); 1228 if (error) 1229 break; 1230 error = sppp_params(sp, cmd, data); 1231 break; 1232 1233 case SPPPGETSTATUS: 1234 case SPPPGETSTATUSNCP: 1235 case SPPPGETIDLETO: 1236 case SPPPGETDNSOPTS: 1237 case SPPPGETDNSADDRS: 1238 case SPPPGETKEEPALIVE: 1239 #if defined(COMPAT_50) || defined(MODULAR) 1240 case __SPPPGETIDLETO50: 1241 case __SPPPGETKEEPALIVE50: 1242 #endif /* COMPAT_50 || MODULAR */ 1243 error = sppp_params(sp, cmd, data); 1244 break; 1245 1246 default: 1247 error = ifioctl_common(ifp, cmd, data); 1248 break; 1249 } 1250 splx(s); 1251 return (error); 1252 } 1253 1254 1255 /* 1256 * Cisco framing implementation. 1257 */ 1258 1259 /* 1260 * Handle incoming Cisco keepalive protocol packets. 1261 */ 1262 static void 1263 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1264 { 1265 STDDCL; 1266 struct cisco_packet *h; 1267 #ifdef INET 1268 uint32_t me, mymask = 0; /* XXX: GCC */ 1269 #endif 1270 1271 SPPP_LOCK(sp, RW_WRITER); 1272 1273 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1274 if (debug) 1275 log(LOG_DEBUG, 1276 "%s: cisco invalid packet length: %d bytes\n", 1277 ifp->if_xname, m->m_pkthdr.len); 1278 SPPP_UNLOCK(sp); 1279 return; 1280 } 1281 h = mtod(m, struct cisco_packet *); 1282 if (debug) 1283 log(LOG_DEBUG, 1284 "%s: cisco input: %d bytes " 1285 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1286 ifp->if_xname, m->m_pkthdr.len, 1287 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1288 (u_int)h->time0, (u_int)h->time1); 1289 switch (ntohl(h->type)) { 1290 default: 1291 if (debug) 1292 addlog("%s: cisco unknown packet type: 0x%x\n", 1293 ifp->if_xname, ntohl(h->type)); 1294 break; 1295 case CISCO_ADDR_REPLY: 1296 /* Reply on address request, ignore */ 1297 break; 1298 case CISCO_KEEPALIVE_REQ: 1299 sp->pp_alivecnt = 0; 1300 sp->scp[IDX_LCP].rseq = ntohl(h->par1); 1301 if (sp->scp[IDX_LCP].seq == sp->scp[IDX_LCP].rseq) { 1302 /* Local and remote sequence numbers are equal. 1303 * Probably, the line is in loopback mode. */ 1304 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1305 printf ("%s: loopback\n", 1306 ifp->if_xname); 1307 sp->pp_loopcnt = 0; 1308 if (ifp->if_flags & IFF_UP) { 1309 SPPP_UNLOCK(sp); 1310 if_down(ifp); 1311 SPPP_LOCK(sp, RW_WRITER); 1312 1313 IF_PURGE(&sp->pp_cpq); 1314 } 1315 } 1316 ++sp->pp_loopcnt; 1317 1318 /* Generate new local sequence number */ 1319 sp->scp[IDX_LCP].seq = cprng_fast32(); 1320 break; 1321 } 1322 sp->pp_loopcnt = 0; 1323 if (! (ifp->if_flags & IFF_UP) && 1324 (ifp->if_flags & IFF_RUNNING)) { 1325 SPPP_UNLOCK(sp); 1326 if_up(ifp); 1327 SPPP_LOCK(sp, RW_WRITER); 1328 } 1329 break; 1330 case CISCO_ADDR_REQ: 1331 #ifdef INET 1332 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1333 if (me != 0L) 1334 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1335 #endif 1336 break; 1337 } 1338 SPPP_UNLOCK(sp); 1339 } 1340 1341 /* 1342 * Send Cisco keepalive packet. 1343 */ 1344 static void 1345 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1346 { 1347 STDDCL; 1348 struct ppp_header *h; 1349 struct cisco_packet *ch; 1350 struct mbuf *m; 1351 uint32_t t; 1352 1353 KASSERT(SPPP_WLOCKED(sp)); 1354 1355 t = time_uptime * 1000; 1356 MGETHDR(m, M_DONTWAIT, MT_DATA); 1357 if (! m) 1358 return; 1359 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1360 m_reset_rcvif(m); 1361 1362 h = mtod(m, struct ppp_header *); 1363 h->address = CISCO_MULTICAST; 1364 h->control = 0; 1365 h->protocol = htons(CISCO_KEEPALIVE); 1366 1367 ch = (struct cisco_packet *)(h + 1); 1368 ch->type = htonl(type); 1369 ch->par1 = htonl(par1); 1370 ch->par2 = htonl(par2); 1371 ch->rel = -1; 1372 1373 ch->time0 = htons((u_short)(t >> 16)); 1374 ch->time1 = htons((u_short) t); 1375 1376 if (debug) 1377 log(LOG_DEBUG, 1378 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1379 ifp->if_xname, ntohl(ch->type), ch->par1, 1380 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1381 (u_int)ch->time1); 1382 1383 if (IF_QFULL(&sp->pp_cpq)) { 1384 IF_DROP(&sp->pp_fastq); 1385 IF_DROP(&ifp->if_snd); 1386 m_freem(m); 1387 if_statinc(ifp, if_oerrors); 1388 return; 1389 } 1390 1391 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 1392 IF_ENQUEUE(&sp->pp_cpq, m); 1393 1394 if (! (ifp->if_flags & IFF_OACTIVE)) { 1395 SPPP_UNLOCK(sp); 1396 if_start_lock(ifp); 1397 SPPP_LOCK(sp, RW_WRITER); 1398 } 1399 } 1400 1401 /* 1402 * PPP protocol implementation. 1403 */ 1404 1405 /* 1406 * Send PPP control protocol packet. 1407 */ 1408 static void 1409 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1410 u_char ident, u_short len, void *data) 1411 { 1412 STDDCL; 1413 struct lcp_header *lh; 1414 struct mbuf *m; 1415 size_t pkthdrlen; 1416 1417 KASSERT(SPPP_WLOCKED(sp)); 1418 1419 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1420 1421 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1422 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1423 MGETHDR(m, M_DONTWAIT, MT_DATA); 1424 if (! m) { 1425 return; 1426 } 1427 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1428 m_reset_rcvif(m); 1429 1430 if (sp->pp_flags & PP_NOFRAMING) { 1431 *mtod(m, uint16_t *) = htons(proto); 1432 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1433 } else { 1434 struct ppp_header *h; 1435 h = mtod(m, struct ppp_header *); 1436 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1437 h->control = PPP_UI; /* Unnumbered Info */ 1438 h->protocol = htons(proto); /* Link Control Protocol */ 1439 lh = (struct lcp_header *)(h + 1); 1440 } 1441 lh->type = type; 1442 lh->ident = ident; 1443 lh->len = htons(LCP_HEADER_LEN + len); 1444 if (len) 1445 memcpy(lh + 1, data, len); 1446 1447 if (debug) { 1448 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1449 ifp->if_xname, 1450 sppp_proto_name(proto), 1451 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1452 if (len) 1453 sppp_print_bytes((u_char *)(lh + 1), len); 1454 addlog(">\n"); 1455 } 1456 if (IF_QFULL(&sp->pp_cpq)) { 1457 IF_DROP(&sp->pp_fastq); 1458 IF_DROP(&ifp->if_snd); 1459 m_freem(m); 1460 if_statinc(ifp, if_oerrors); 1461 return; 1462 } 1463 1464 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 1465 IF_ENQUEUE(&sp->pp_cpq, m); 1466 1467 1468 if (! (ifp->if_flags & IFF_OACTIVE)) { 1469 SPPP_UNLOCK(sp); 1470 if_start_lock(ifp); 1471 SPPP_LOCK(sp, RW_WRITER); 1472 } 1473 } 1474 1475 /* 1476 * Handle incoming PPP control protocol packets. 1477 */ 1478 static void 1479 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1480 { 1481 STDDCL; 1482 struct lcp_header *h; 1483 int printlen, len = m->m_pkthdr.len; 1484 int rv; 1485 u_char *p; 1486 uint32_t u32; 1487 1488 SPPP_LOCK(sp, RW_WRITER); 1489 1490 if (len < 4) { 1491 if (debug) 1492 log(LOG_DEBUG, 1493 "%s: %s invalid packet length: %d bytes\n", 1494 ifp->if_xname, cp->name, len); 1495 SPPP_UNLOCK(sp); 1496 return; 1497 } 1498 h = mtod(m, struct lcp_header *); 1499 if (debug) { 1500 printlen = ntohs(h->len); 1501 log(LOG_DEBUG, 1502 "%s: %s input(%s): <%s id=0x%x len=%d", 1503 ifp->if_xname, cp->name, 1504 sppp_state_name(sp->scp[cp->protoidx].state), 1505 sppp_cp_type_name(h->type), h->ident, printlen); 1506 if (len < printlen) 1507 printlen = len; 1508 if (printlen > 4) 1509 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1510 addlog(">\n"); 1511 } 1512 if (len > ntohs(h->len)) 1513 len = ntohs(h->len); 1514 p = (u_char *)(h + 1); 1515 switch (h->type) { 1516 case CONF_REQ: 1517 if (len < 4) { 1518 if (debug) 1519 addlog("%s: %s invalid conf-req length %d\n", 1520 ifp->if_xname, cp->name, 1521 len); 1522 if_statinc(ifp, if_ierrors); 1523 break; 1524 } 1525 rv = (cp->RCR)(sp, h, len); 1526 if (rv < 0) { 1527 /* fatal error, shut down */ 1528 (cp->tld)(sp); 1529 sppp_lcp_tlf(sp); 1530 SPPP_UNLOCK(sp); 1531 return; 1532 } 1533 sp->scp[cp->protoidx].rconfid = h->ident; 1534 sppp_rcr_event(cp, sp); 1535 break; 1536 case CONF_ACK: 1537 if (h->ident != sp->scp[cp->protoidx].confid) { 1538 if (debug) 1539 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1540 ifp->if_xname, cp->name, 1541 h->ident, sp->scp[cp->protoidx].confid); 1542 if_statinc(ifp, if_ierrors); 1543 break; 1544 } 1545 switch (sp->scp[cp->protoidx].state) { 1546 case STATE_CLOSED: 1547 case STATE_STOPPED: 1548 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1549 break; 1550 case STATE_CLOSING: 1551 case STATE_STOPPING: 1552 break; 1553 case STATE_REQ_SENT: 1554 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1555 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1556 break; 1557 case STATE_OPENED: 1558 (cp->tld)(sp); 1559 /* fall through */ 1560 case STATE_ACK_RCVD: 1561 (cp->scr)(sp); 1562 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1563 break; 1564 case STATE_ACK_SENT: 1565 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1566 sppp_cp_change_state(cp, sp, STATE_OPENED); 1567 if (debug) 1568 log(LOG_DEBUG, "%s: %s tlu\n", 1569 ifp->if_xname, cp->name); 1570 (cp->tlu)(sp); 1571 break; 1572 default: 1573 printf("%s: %s illegal %s in state %s\n", 1574 ifp->if_xname, cp->name, 1575 sppp_cp_type_name(h->type), 1576 sppp_state_name(sp->scp[cp->protoidx].state)); 1577 if_statinc(ifp, if_ierrors); 1578 } 1579 break; 1580 case CONF_NAK: 1581 case CONF_REJ: 1582 if (h->ident != sp->scp[cp->protoidx].confid) { 1583 if (debug) 1584 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1585 ifp->if_xname, cp->name, 1586 h->ident, sp->scp[cp->protoidx].confid); 1587 if_statinc(ifp, if_ierrors); 1588 break; 1589 } 1590 if (h->type == CONF_NAK) 1591 (cp->RCN_nak)(sp, h, len); 1592 else /* CONF_REJ */ 1593 (cp->RCN_rej)(sp, h, len); 1594 1595 switch (sp->scp[cp->protoidx].state) { 1596 case STATE_CLOSED: 1597 case STATE_STOPPED: 1598 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1599 break; 1600 case STATE_REQ_SENT: 1601 case STATE_ACK_SENT: 1602 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1603 (cp->scr)(sp); 1604 break; 1605 case STATE_OPENED: 1606 (cp->tld)(sp); 1607 /* fall through */ 1608 case STATE_ACK_RCVD: 1609 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1610 (cp->scr)(sp); 1611 break; 1612 case STATE_CLOSING: 1613 case STATE_STOPPING: 1614 break; 1615 default: 1616 printf("%s: %s illegal %s in state %s\n", 1617 ifp->if_xname, cp->name, 1618 sppp_cp_type_name(h->type), 1619 sppp_state_name(sp->scp[cp->protoidx].state)); 1620 if_statinc(ifp, if_ierrors); 1621 } 1622 break; 1623 1624 case TERM_REQ: 1625 switch (sp->scp[cp->protoidx].state) { 1626 case STATE_ACK_RCVD: 1627 case STATE_ACK_SENT: 1628 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1629 /* fall through */ 1630 case STATE_CLOSED: 1631 case STATE_STOPPED: 1632 case STATE_CLOSING: 1633 case STATE_STOPPING: 1634 case STATE_REQ_SENT: 1635 sta: 1636 /* Send Terminate-Ack packet. */ 1637 if (debug) 1638 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1639 ifp->if_xname, cp->name); 1640 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1641 break; 1642 case STATE_OPENED: 1643 (cp->tld)(sp); 1644 sp->scp[cp->protoidx].rst_counter = 0; 1645 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1646 goto sta; 1647 default: 1648 printf("%s: %s illegal %s in state %s\n", 1649 ifp->if_xname, cp->name, 1650 sppp_cp_type_name(h->type), 1651 sppp_state_name(sp->scp[cp->protoidx].state)); 1652 if_statinc(ifp, if_ierrors); 1653 } 1654 break; 1655 case TERM_ACK: 1656 switch (sp->scp[cp->protoidx].state) { 1657 case STATE_CLOSED: 1658 case STATE_STOPPED: 1659 case STATE_REQ_SENT: 1660 case STATE_ACK_SENT: 1661 break; 1662 case STATE_CLOSING: 1663 (cp->tlf)(sp); 1664 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1665 sppp_lcp_check_and_close(sp); 1666 break; 1667 case STATE_STOPPING: 1668 (cp->tlf)(sp); 1669 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1670 sppp_lcp_check_and_close(sp); 1671 break; 1672 case STATE_ACK_RCVD: 1673 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1674 break; 1675 case STATE_OPENED: 1676 (cp->tld)(sp); 1677 (cp->scr)(sp); 1678 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1679 break; 1680 default: 1681 printf("%s: %s illegal %s in state %s\n", 1682 ifp->if_xname, cp->name, 1683 sppp_cp_type_name(h->type), 1684 sppp_state_name(sp->scp[cp->protoidx].state)); 1685 if_statinc(ifp, if_ierrors); 1686 } 1687 break; 1688 case CODE_REJ: 1689 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1690 log(LOG_INFO, 1691 "%s: %s: ignoring RXJ (%s) for code ?, " 1692 "danger will robinson\n", 1693 ifp->if_xname, cp->name, 1694 sppp_cp_type_name(h->type)); 1695 switch (sp->scp[cp->protoidx].state) { 1696 case STATE_CLOSED: 1697 case STATE_STOPPED: 1698 case STATE_REQ_SENT: 1699 case STATE_ACK_SENT: 1700 case STATE_CLOSING: 1701 case STATE_STOPPING: 1702 case STATE_OPENED: 1703 break; 1704 case STATE_ACK_RCVD: 1705 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1706 break; 1707 default: 1708 printf("%s: %s illegal %s in state %s\n", 1709 ifp->if_xname, cp->name, 1710 sppp_cp_type_name(h->type), 1711 sppp_state_name(sp->scp[cp->protoidx].state)); 1712 if_statinc(ifp, if_ierrors); 1713 } 1714 break; 1715 case PROTO_REJ: 1716 { 1717 int catastrophic; 1718 const struct cp *upper; 1719 int i; 1720 uint16_t proto; 1721 1722 catastrophic = 0; 1723 upper = NULL; 1724 proto = p[0] << 8 | p[1]; 1725 for (i = 0; i < IDX_COUNT; i++) { 1726 if (cps[i]->proto == proto) { 1727 upper = cps[i]; 1728 break; 1729 } 1730 } 1731 if (upper == NULL) 1732 catastrophic++; 1733 1734 if (debug) 1735 log(LOG_INFO, 1736 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1737 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1738 sppp_cp_type_name(h->type), proto, 1739 upper ? upper->name : "unknown", 1740 upper ? sppp_state_name(sp->scp[upper->protoidx].state) : "?"); 1741 1742 /* 1743 * if we got RXJ+ against conf-req, the peer does not implement 1744 * this particular protocol type. terminate the protocol. 1745 */ 1746 if (upper && !catastrophic) { 1747 if (sp->scp[upper->protoidx].state == STATE_REQ_SENT) { 1748 upper->Close(sp); 1749 break; 1750 } 1751 } 1752 1753 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1754 switch (sp->scp[cp->protoidx].state) { 1755 case STATE_CLOSED: 1756 case STATE_STOPPED: 1757 case STATE_REQ_SENT: 1758 case STATE_ACK_SENT: 1759 case STATE_CLOSING: 1760 case STATE_STOPPING: 1761 case STATE_OPENED: 1762 break; 1763 case STATE_ACK_RCVD: 1764 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1765 break; 1766 default: 1767 printf("%s: %s illegal %s in state %s\n", 1768 ifp->if_xname, cp->name, 1769 sppp_cp_type_name(h->type), 1770 sppp_state_name(sp->scp[cp->protoidx].state)); 1771 if_statinc(ifp, if_ierrors); 1772 } 1773 break; 1774 } 1775 case DISC_REQ: 1776 if (cp->proto != PPP_LCP) 1777 goto illegal; 1778 /* Discard the packet. */ 1779 break; 1780 case ECHO_REQ: 1781 if (cp->proto != PPP_LCP) 1782 goto illegal; 1783 if (sp->scp[cp->protoidx].state != STATE_OPENED) { 1784 if (debug) 1785 addlog("%s: lcp echo req but lcp closed\n", 1786 ifp->if_xname); 1787 if_statinc(ifp, if_ierrors); 1788 break; 1789 } 1790 if (len < 8) { 1791 if (debug) 1792 addlog("%s: invalid lcp echo request " 1793 "packet length: %d bytes\n", 1794 ifp->if_xname, len); 1795 break; 1796 } 1797 memcpy(&u32, h + 1, sizeof u32); 1798 if (ntohl(u32) == sp->lcp.magic) { 1799 /* Line loopback mode detected. */ 1800 printf("%s: loopback\n", ifp->if_xname); 1801 SPPP_UNLOCK(sp); 1802 if_down(ifp); 1803 SPPP_LOCK(sp, RW_WRITER); 1804 1805 IF_PURGE(&sp->pp_cpq); 1806 1807 /* Shut down the PPP link. */ 1808 /* XXX */ 1809 lcp.Down(sp); 1810 lcp.Up(sp); 1811 break; 1812 } 1813 u32 = htonl(sp->lcp.magic); 1814 memcpy(h + 1, &u32, sizeof u32); 1815 if (debug) 1816 addlog("%s: got lcp echo req, sending echo rep\n", 1817 ifp->if_xname); 1818 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1819 h + 1); 1820 break; 1821 case ECHO_REPLY: 1822 if (cp->proto != PPP_LCP) 1823 goto illegal; 1824 if (h->ident != sp->lcp.echoid) { 1825 if_statinc(ifp, if_ierrors); 1826 break; 1827 } 1828 if (len < 8) { 1829 if (debug) 1830 addlog("%s: lcp invalid echo reply " 1831 "packet length: %d bytes\n", 1832 ifp->if_xname, len); 1833 break; 1834 } 1835 if (debug) 1836 addlog("%s: lcp got echo rep\n", 1837 ifp->if_xname); 1838 memcpy(&u32, h + 1, sizeof u32); 1839 if (ntohl(u32) != sp->lcp.magic) 1840 sp->pp_alivecnt = 0; 1841 break; 1842 default: 1843 /* Unknown packet type -- send Code-Reject packet. */ 1844 illegal: 1845 if (debug) 1846 addlog("%s: %s send code-rej for 0x%x\n", 1847 ifp->if_xname, cp->name, h->type); 1848 sppp_cp_send(sp, cp->proto, CODE_REJ, 1849 ++sp->scp[cp->protoidx].seq, m->m_pkthdr.len, h); 1850 if_statinc(ifp, if_ierrors); 1851 } 1852 1853 SPPP_UNLOCK(sp); 1854 } 1855 1856 1857 /* 1858 * The generic part of all Up/Down/Open/Close/TO event handlers. 1859 * Basically, the state transition handling in the automaton. 1860 */ 1861 static void 1862 sppp_up_event(const struct cp *cp, struct sppp *sp) 1863 { 1864 STDDCL; 1865 1866 KASSERT(SPPP_WLOCKED(sp)); 1867 1868 if (debug) 1869 log(LOG_DEBUG, "%s: %s up(%s)\n", 1870 ifp->if_xname, cp->name, 1871 sppp_state_name(sp->scp[cp->protoidx].state)); 1872 1873 switch (sp->scp[cp->protoidx].state) { 1874 case STATE_INITIAL: 1875 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1876 break; 1877 case STATE_STARTING: 1878 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1879 (cp->scr)(sp); 1880 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1881 break; 1882 default: 1883 printf("%s: %s illegal up in state %s\n", 1884 ifp->if_xname, cp->name, 1885 sppp_state_name(sp->scp[cp->protoidx].state)); 1886 } 1887 } 1888 1889 static void 1890 sppp_down_event(const struct cp *cp, struct sppp *sp) 1891 { 1892 STDDCL; 1893 1894 KASSERT(SPPP_WLOCKED(sp)); 1895 1896 if (debug) 1897 log(LOG_DEBUG, "%s: %s down(%s)\n", 1898 ifp->if_xname, cp->name, 1899 sppp_state_name(sp->scp[cp->protoidx].state)); 1900 1901 switch (sp->scp[cp->protoidx].state) { 1902 case STATE_CLOSED: 1903 case STATE_CLOSING: 1904 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1905 break; 1906 case STATE_STOPPED: 1907 (cp->tls)(sp); 1908 /* fall through */ 1909 case STATE_STOPPING: 1910 case STATE_REQ_SENT: 1911 case STATE_ACK_RCVD: 1912 case STATE_ACK_SENT: 1913 sppp_cp_change_state(cp, sp, STATE_STARTING); 1914 break; 1915 case STATE_OPENED: 1916 (cp->tld)(sp); 1917 sppp_cp_change_state(cp, sp, STATE_STARTING); 1918 break; 1919 default: 1920 printf("%s: %s illegal down in state %s\n", 1921 ifp->if_xname, cp->name, 1922 sppp_state_name(sp->scp[cp->protoidx].state)); 1923 } 1924 } 1925 1926 1927 static void 1928 sppp_open_event(const struct cp *cp, struct sppp *sp) 1929 { 1930 STDDCL; 1931 1932 KASSERT(SPPP_WLOCKED(sp)); 1933 1934 if (debug) 1935 log(LOG_DEBUG, "%s: %s open(%s)\n", 1936 ifp->if_xname, cp->name, 1937 sppp_state_name(sp->scp[cp->protoidx].state)); 1938 1939 switch (sp->scp[cp->protoidx].state) { 1940 case STATE_INITIAL: 1941 sppp_cp_change_state(cp, sp, STATE_STARTING); 1942 (cp->tls)(sp); 1943 break; 1944 case STATE_STARTING: 1945 break; 1946 case STATE_CLOSED: 1947 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_configure; 1948 (cp->scr)(sp); 1949 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1950 break; 1951 case STATE_STOPPED: 1952 case STATE_STOPPING: 1953 case STATE_REQ_SENT: 1954 case STATE_ACK_RCVD: 1955 case STATE_ACK_SENT: 1956 case STATE_OPENED: 1957 break; 1958 case STATE_CLOSING: 1959 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1960 break; 1961 } 1962 } 1963 1964 1965 static void 1966 sppp_close_event(const struct cp *cp, struct sppp *sp) 1967 { 1968 STDDCL; 1969 1970 KASSERT(SPPP_WLOCKED(sp)); 1971 1972 if (debug) 1973 log(LOG_DEBUG, "%s: %s close(%s)\n", 1974 ifp->if_xname, cp->name, 1975 sppp_state_name(sp->scp[cp->protoidx].state)); 1976 1977 switch (sp->scp[cp->protoidx].state) { 1978 case STATE_INITIAL: 1979 case STATE_CLOSED: 1980 case STATE_CLOSING: 1981 break; 1982 case STATE_STARTING: 1983 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1984 (cp->tlf)(sp); 1985 break; 1986 case STATE_STOPPED: 1987 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1988 break; 1989 case STATE_STOPPING: 1990 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1991 break; 1992 case STATE_OPENED: 1993 (cp->tld)(sp); 1994 /* fall through */ 1995 case STATE_REQ_SENT: 1996 case STATE_ACK_RCVD: 1997 case STATE_ACK_SENT: 1998 sp->scp[cp->protoidx].rst_counter = sp->lcp.max_terminate; 1999 sppp_cp_send(sp, cp->proto, TERM_REQ, 2000 ++sp->scp[cp->protoidx].seq, 0, 0); 2001 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2002 break; 2003 } 2004 } 2005 2006 static void 2007 sppp_to_event(const struct cp *cp, struct sppp *sp) 2008 { 2009 STDDCL; 2010 int s; 2011 2012 KASSERT(SPPP_WLOCKED(sp)); 2013 2014 s = splnet(); 2015 2016 if (debug) 2017 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 2018 ifp->if_xname, cp->name, 2019 sppp_state_name(sp->scp[cp->protoidx].state), 2020 sp->scp[cp->protoidx].rst_counter); 2021 2022 if (--sp->scp[cp->protoidx].rst_counter < 0) 2023 /* TO- event */ 2024 switch (sp->scp[cp->protoidx].state) { 2025 case STATE_CLOSING: 2026 (cp->tlf)(sp); 2027 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2028 sppp_lcp_check_and_close(sp); 2029 break; 2030 case STATE_STOPPING: 2031 (cp->tlf)(sp); 2032 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2033 sppp_lcp_check_and_close(sp); 2034 break; 2035 case STATE_REQ_SENT: 2036 case STATE_ACK_RCVD: 2037 case STATE_ACK_SENT: 2038 (cp->tlf)(sp); 2039 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2040 sppp_lcp_check_and_close(sp); 2041 break; 2042 } 2043 else 2044 /* TO+ event */ 2045 switch (sp->scp[cp->protoidx].state) { 2046 case STATE_CLOSING: 2047 case STATE_STOPPING: 2048 sppp_cp_send(sp, cp->proto, TERM_REQ, 2049 ++sp->scp[cp->protoidx].seq, 0, 0); 2050 callout_reset(&sp->scp[cp->protoidx].ch, sp->lcp.timeout, 2051 cp->TO, sp); 2052 break; 2053 case STATE_REQ_SENT: 2054 case STATE_ACK_RCVD: 2055 (cp->scr)(sp); 2056 /* sppp_cp_change_state() will restart the timer */ 2057 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2058 break; 2059 case STATE_ACK_SENT: 2060 (cp->scr)(sp); 2061 callout_reset(&sp->scp[cp->protoidx].ch, sp->lcp.timeout, 2062 cp->TO, sp); 2063 break; 2064 } 2065 2066 splx(s); 2067 } 2068 2069 static void 2070 sppp_rcr_event(const struct cp *cp, struct sppp *sp) 2071 { 2072 STDDCL; 2073 u_char type; 2074 void *buf; 2075 size_t blen; 2076 2077 type = sp->scp[cp->protoidx].rcr_type; 2078 buf = sp->scp[cp->protoidx].rcr_buf; 2079 blen = sp->scp[cp->protoidx].rcr_blen; 2080 2081 if (type == CONF_ACK) { 2082 /* RCR+ event */ 2083 switch (sp->scp[cp->protoidx].state) { 2084 case STATE_OPENED: 2085 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2086 cp->tld(sp); 2087 cp->scr(sp); 2088 cp->scan(cp, sp); 2089 break; 2090 case STATE_ACK_SENT: 2091 case STATE_REQ_SENT: 2092 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2093 cp->scan(cp, sp); 2094 break; 2095 case STATE_STOPPED: 2096 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 2097 cp->scr(sp); 2098 cp->scan(cp, sp); 2099 break; 2100 case STATE_ACK_RCVD: 2101 sppp_cp_change_state(cp, sp, STATE_OPENED); 2102 if (debug) 2103 log(LOG_DEBUG, "%s: %s tlu\n", 2104 ifp->if_xname, 2105 cp->name); 2106 cp->tlu(sp); 2107 cp->scan(cp, sp); 2108 break; 2109 case STATE_CLOSING: 2110 case STATE_STOPPING: 2111 if (buf != NULL) { 2112 sp->scp[cp->protoidx].rcr_buf = NULL; 2113 sp->scp[cp->protoidx].rcr_blen = 0; 2114 kmem_free(buf, blen); 2115 } 2116 break; 2117 case STATE_CLOSED: 2118 sppp_cp_send(sp, cp->proto, TERM_ACK, 2119 sp->scp[cp->protoidx].rconfid, 0, 0); 2120 break; 2121 default: 2122 printf("%s: %s illegal RCR+ in state %s\n", 2123 ifp->if_xname, cp->name, 2124 sppp_state_name(sp->scp[cp->protoidx].state)); 2125 if_statinc(ifp, if_ierrors); 2126 } 2127 } else { 2128 /* RCR- event */ 2129 switch (sp->scp[cp->protoidx].state) { 2130 case STATE_OPENED: 2131 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2132 cp->tld(sp); 2133 cp->scr(sp); 2134 cp->scan(cp, sp); 2135 break; 2136 case STATE_ACK_SENT: 2137 case STATE_REQ_SENT: 2138 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2139 cp->scan(cp, sp); 2140 break; 2141 case STATE_STOPPED: 2142 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2143 cp->scr(sp); 2144 cp->scan(cp, sp); 2145 break; 2146 case STATE_ACK_RCVD: 2147 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 2148 cp->scan(cp, sp); 2149 break; 2150 case STATE_CLOSING: 2151 case STATE_STOPPING: 2152 if (buf != NULL) { 2153 sp->scp[cp->protoidx].rcr_buf = NULL; 2154 sp->scp[cp->protoidx].rcr_blen = 0; 2155 kmem_free(buf, blen); 2156 } 2157 break; 2158 case STATE_CLOSED: 2159 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2160 sppp_cp_send(sp, cp->proto, TERM_ACK, 2161 sp->scp[cp->protoidx].rconfid, 0, 0); 2162 break; 2163 default: 2164 printf("%s: %s illegal RCR- in state %s\n", 2165 ifp->if_xname, cp->name, 2166 sppp_state_name(sp->scp[cp->protoidx].state)); 2167 if_statinc(ifp, if_ierrors); 2168 } 2169 } 2170 } 2171 2172 /* 2173 * Change the state of a control protocol in the state automaton. 2174 * Takes care of starting/stopping the restart timer. 2175 */ 2176 void 2177 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 2178 { 2179 2180 KASSERT(SPPP_WLOCKED(sp)); 2181 2182 sp->scp[cp->protoidx].state = newstate; 2183 callout_stop(&sp->scp[cp->protoidx].ch); 2184 switch (newstate) { 2185 case STATE_INITIAL: 2186 case STATE_STARTING: 2187 case STATE_CLOSED: 2188 case STATE_STOPPED: 2189 case STATE_OPENED: 2190 break; 2191 case STATE_CLOSING: 2192 case STATE_STOPPING: 2193 case STATE_REQ_SENT: 2194 case STATE_ACK_RCVD: 2195 case STATE_ACK_SENT: 2196 callout_reset(&sp->scp[cp->protoidx].ch, sp->lcp.timeout, 2197 cp->TO, sp); 2198 break; 2199 } 2200 } 2201 2202 /* 2203 *--------------------------------------------------------------------------* 2204 * * 2205 * The LCP implementation. * 2206 * * 2207 *--------------------------------------------------------------------------* 2208 */ 2209 static void 2210 sppp_lcp_init(struct sppp *sp) 2211 { 2212 2213 KASSERT(SPPP_WLOCKED(sp)); 2214 2215 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2216 sp->lcp.magic = 0; 2217 sp->scp[IDX_LCP].state = STATE_INITIAL; 2218 sp->scp[IDX_LCP].fail_counter = 0; 2219 sp->scp[IDX_LCP].seq = 0; 2220 sp->scp[IDX_LCP].rseq = 0; 2221 sp->lcp.protos = 0; 2222 2223 /* 2224 * Initialize counters and timeout values. Note that we don't 2225 * use the 3 seconds suggested in RFC 1661 since we are likely 2226 * running on a fast link. XXX We should probably implement 2227 * the exponential backoff option. Note that these values are 2228 * relevant for all control protocols, not just LCP only. 2229 */ 2230 sp->lcp.timeout = 1 * hz; 2231 sp->lcp.max_terminate = 2; 2232 sp->lcp.max_configure = 10; 2233 sp->lcp.max_failure = 10; 2234 callout_init(&sp->scp[IDX_LCP].ch, CALLOUT_MPSAFE); 2235 } 2236 2237 static void 2238 sppp_lcp_up(struct sppp *sp) 2239 { 2240 STDDCL; 2241 2242 KASSERT(SPPP_WLOCKED(sp)); 2243 2244 /* Initialize activity timestamp: opening a connection is an activity */ 2245 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2246 2247 /* 2248 * If this interface is passive or dial-on-demand, and we are 2249 * still in Initial state, it means we've got an incoming 2250 * call. Activate the interface. 2251 */ 2252 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2253 if (debug) 2254 log(LOG_DEBUG, 2255 "%s: Up event", ifp->if_xname); 2256 ifp->if_flags |= IFF_RUNNING; 2257 if (sp->scp[IDX_LCP].state == STATE_INITIAL) { 2258 if (debug) 2259 addlog("(incoming call)\n"); 2260 sp->pp_flags |= PP_CALLIN; 2261 lcp.Open(sp); 2262 } else if (debug) 2263 addlog("\n"); 2264 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2265 (sp->scp[IDX_LCP].state == STATE_INITIAL)) { 2266 ifp->if_flags |= IFF_RUNNING; 2267 lcp.Open(sp); 2268 } 2269 2270 sppp_up_event(&lcp, sp); 2271 } 2272 2273 static void 2274 sppp_lcp_down(struct sppp *sp) 2275 { 2276 STDDCL; 2277 2278 KASSERT(SPPP_WLOCKED(sp)); 2279 2280 sppp_down_event(&lcp, sp); 2281 2282 /* 2283 * If this is neither a dial-on-demand nor a passive 2284 * interface, simulate an ``ifconfig down'' action, so the 2285 * administrator can force a redial by another ``ifconfig 2286 * up''. XXX For leased line operation, should we immediately 2287 * try to reopen the connection here? 2288 */ 2289 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2290 if (debug) 2291 log(LOG_INFO, 2292 "%s: Down event (carrier loss), taking interface down.\n", 2293 ifp->if_xname); 2294 SPPP_UNLOCK(sp); 2295 if_down(ifp); 2296 SPPP_LOCK(sp, RW_WRITER); 2297 } else { 2298 if (debug) 2299 log(LOG_DEBUG, 2300 "%s: Down event (carrier loss)\n", 2301 ifp->if_xname); 2302 } 2303 sp->scp[IDX_LCP].fail_counter = 0; 2304 sp->pp_flags &= ~PP_CALLIN; 2305 if (sp->scp[IDX_LCP].state != STATE_INITIAL) 2306 lcp.Close(sp); 2307 ifp->if_flags &= ~IFF_RUNNING; 2308 } 2309 2310 static void 2311 sppp_lcp_open(struct sppp *sp) 2312 { 2313 2314 KASSERT(SPPP_WLOCKED(sp)); 2315 2316 if (sp->pp_if.if_mtu < PP_MTU) { 2317 sp->lcp.mru = sp->pp_if.if_mtu; 2318 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2319 } else 2320 sp->lcp.mru = PP_MTU; 2321 sp->lcp.their_mru = PP_MTU; 2322 2323 /* 2324 * If we are authenticator, negotiate LCP_AUTH 2325 */ 2326 if (sp->hisauth.proto != 0) 2327 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2328 else 2329 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2330 sp->pp_flags &= ~PP_NEEDAUTH; 2331 sppp_open_event(&lcp, sp); 2332 } 2333 2334 static void 2335 sppp_lcp_close(struct sppp *sp) 2336 { 2337 2338 KASSERT(SPPP_WLOCKED(sp)); 2339 sppp_close_event(&lcp, sp); 2340 } 2341 2342 static void 2343 sppp_lcp_TO(void *cookie) 2344 { 2345 struct sppp *sp = (struct sppp*)cookie; 2346 2347 SPPP_LOCK(sp, RW_WRITER); 2348 sppp_to_event(&lcp, sp); 2349 SPPP_UNLOCK(sp); 2350 } 2351 2352 /* 2353 * Analyze a configure request. Return true if it was agreeable, and 2354 * caused action sca, false if it has been rejected or nak'ed, and 2355 * caused action scn. (The return value is used to make the state 2356 * transition decision in the state automaton.) 2357 */ 2358 static int 2359 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int origlen) 2360 { 2361 STDDCL; 2362 u_char *buf, *r, *p, l, blen, type; 2363 int len, rlen; 2364 uint32_t nmagic; 2365 u_short authproto; 2366 2367 KASSERT(SPPP_WLOCKED(sp)); 2368 2369 if (origlen < sizeof(*h)) 2370 return 0; 2371 2372 origlen -= sizeof(*h); 2373 type = 0; 2374 2375 if (origlen <= 0) 2376 return 0; 2377 else 2378 blen = origlen; 2379 2380 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 2381 if (buf == NULL) 2382 return 0; 2383 2384 if (debug) 2385 log(LOG_DEBUG, "%s: lcp parse opts:", 2386 ifp->if_xname); 2387 2388 /* pass 1: check for things that need to be rejected */ 2389 p = (void *)(h + 1); 2390 r = buf; 2391 rlen = 0; 2392 for (len = origlen; len > 1; len-= l, p += l) { 2393 l = p[1]; 2394 if (l == 0) 2395 break; 2396 2397 /* Sanity check option length */ 2398 if (l > len) { 2399 /* 2400 * Malicious option - drop immediately. 2401 * XXX Maybe we should just RXJ it? 2402 */ 2403 addlog("%s: received malicious LCP option 0x%02x, " 2404 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2405 p[0], l, len); 2406 rlen = -1; 2407 goto end; 2408 } 2409 if (debug) 2410 addlog(" %s", sppp_lcp_opt_name(*p)); 2411 switch (p[0]) { 2412 case LCP_OPT_MAGIC: 2413 /* Magic number. */ 2414 /* fall through, both are same length */ 2415 case LCP_OPT_ASYNC_MAP: 2416 /* Async control character map. */ 2417 if (len >= 6 || l == 6) 2418 continue; 2419 if (debug) 2420 addlog(" [invalid]"); 2421 break; 2422 case LCP_OPT_MP_EID: 2423 if (len >= l && l >= 3) { 2424 switch (p[2]) { 2425 case 0: if (l==3+ 0) continue;break; 2426 case 2: if (l==3+ 4) continue;break; 2427 case 3: if (l==3+ 6) continue;break; 2428 case 6: if (l==3+16) continue;break; 2429 case 1: /* FALLTHROUGH */ 2430 case 4: if (l<=3+20) continue;break; 2431 case 5: if (l<=3+15) continue;break; 2432 /* XXX should it be default: continue;? */ 2433 } 2434 } 2435 if (debug) 2436 addlog(" [invalid class %d len %d]", p[2], l); 2437 break; 2438 case LCP_OPT_MP_SSNHF: 2439 if (len >= 2 && l == 2) { 2440 if (debug) 2441 addlog(" [rej]"); 2442 break; 2443 } 2444 if (debug) 2445 addlog(" [invalid]"); 2446 break; 2447 case LCP_OPT_MP_MRRU: 2448 /* Multilink maximum received reconstructed unit */ 2449 /* should be fall through, both are same length */ 2450 /* FALLTHROUGH */ 2451 case LCP_OPT_MRU: 2452 /* Maximum receive unit. */ 2453 if (len >= 4 && l == 4) 2454 continue; 2455 if (debug) 2456 addlog(" [invalid]"); 2457 break; 2458 case LCP_OPT_AUTH_PROTO: 2459 if (len < 4) { 2460 if (debug) 2461 addlog(" [invalid]"); 2462 break; 2463 } 2464 authproto = (p[2] << 8) + p[3]; 2465 if (authproto == PPP_CHAP && l != 5) { 2466 if (debug) 2467 addlog(" [invalid chap len]"); 2468 break; 2469 } 2470 if (sp->myauth.proto == 0) { 2471 /* we are not configured to do auth */ 2472 if (debug) 2473 addlog(" [not configured]"); 2474 break; 2475 } 2476 /* 2477 * Remote want us to authenticate, remember this, 2478 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2479 * up. 2480 */ 2481 sp->pp_flags |= PP_NEEDAUTH; 2482 continue; 2483 default: 2484 /* Others not supported. */ 2485 if (debug) 2486 addlog(" [rej]"); 2487 break; 2488 } 2489 if (rlen + l > blen) { 2490 if (debug) 2491 addlog(" [overflow]"); 2492 continue; 2493 } 2494 /* Add the option to rejected list. */ 2495 memcpy(r, p, l); 2496 r += l; 2497 rlen += l; 2498 } 2499 2500 if (rlen > 0) { 2501 type = CONF_REJ; 2502 goto end; 2503 } 2504 2505 if (debug) 2506 addlog("\n"); 2507 2508 /* 2509 * pass 2: check for option values that are unacceptable and 2510 * thus require to be nak'ed. 2511 */ 2512 if (debug) 2513 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2514 ifp->if_xname); 2515 2516 p = (void *)(h + 1); 2517 r = buf; 2518 rlen = 0; 2519 for (len = origlen; len > 0; len -= l, p += l) { 2520 l = p[1]; 2521 if (l == 0) 2522 break; 2523 2524 if (debug) 2525 addlog(" %s", sppp_lcp_opt_name(*p)); 2526 switch (p[0]) { 2527 case LCP_OPT_MAGIC: 2528 /* Magic number -- extract. */ 2529 nmagic = (uint32_t)p[2] << 24 | 2530 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2531 if (nmagic != sp->lcp.magic) { 2532 if (debug) 2533 addlog(" 0x%x", nmagic); 2534 continue; 2535 } 2536 /* 2537 * Local and remote magics equal -- loopback? 2538 */ 2539 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2540 printf ("%s: loopback\n", 2541 ifp->if_xname); 2542 sp->pp_loopcnt = 0; 2543 if (ifp->if_flags & IFF_UP) { 2544 SPPP_UNLOCK(sp); 2545 if_down(ifp); 2546 SPPP_LOCK(sp, RW_WRITER); 2547 2548 IF_PURGE(&sp->pp_cpq); 2549 /* XXX ? */ 2550 lcp.Down(sp); 2551 lcp.Up(sp); 2552 } 2553 } else if (debug) 2554 addlog(" [glitch]"); 2555 ++sp->pp_loopcnt; 2556 /* 2557 * We negate our magic here, and NAK it. If 2558 * we see it later in an NAK packet, we 2559 * suggest a new one. 2560 */ 2561 nmagic = ~sp->lcp.magic; 2562 /* Gonna NAK it. */ 2563 p[2] = nmagic >> 24; 2564 p[3] = nmagic >> 16; 2565 p[4] = nmagic >> 8; 2566 p[5] = nmagic; 2567 break; 2568 2569 case LCP_OPT_ASYNC_MAP: 2570 /* 2571 * Async control character map -- just ignore it. 2572 * 2573 * Quote from RFC 1662, chapter 6: 2574 * To enable this functionality, synchronous PPP 2575 * implementations MUST always respond to the 2576 * Async-Control-Character-Map Configuration 2577 * Option with the LCP Configure-Ack. However, 2578 * acceptance of the Configuration Option does 2579 * not imply that the synchronous implementation 2580 * will do any ACCM mapping. Instead, all such 2581 * octet mapping will be performed by the 2582 * asynchronous-to-synchronous converter. 2583 */ 2584 continue; 2585 2586 case LCP_OPT_MRU: 2587 /* 2588 * Maximum receive unit. Always agreeable, 2589 * but ignored by now. 2590 */ 2591 sp->lcp.their_mru = p[2] * 256 + p[3]; 2592 if (debug) 2593 addlog(" %ld", sp->lcp.their_mru); 2594 continue; 2595 2596 case LCP_OPT_AUTH_PROTO: 2597 authproto = (p[2] << 8) + p[3]; 2598 if (sp->myauth.proto != authproto) { 2599 /* not agreed, nak */ 2600 if (debug) 2601 addlog(" [mine %s != his %s]", 2602 sppp_proto_name(sp->myauth.proto), 2603 sppp_proto_name(authproto)); 2604 p[2] = sp->myauth.proto >> 8; 2605 p[3] = sp->myauth.proto; 2606 break; 2607 } 2608 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2609 if (debug) 2610 addlog(" [chap not MD5]"); 2611 p[4] = CHAP_MD5; 2612 break; 2613 } 2614 continue; 2615 case LCP_OPT_MP_EID: 2616 /* 2617 * Endpoint identification. 2618 * Always agreeable, 2619 * but ignored by now. 2620 */ 2621 if (debug) { 2622 addlog(" type %d", p[2]); 2623 sppp_print_bytes(p+3, p[1]-3); 2624 } 2625 continue; 2626 case LCP_OPT_MP_MRRU: 2627 /* 2628 * Maximum received reconstructed unit. 2629 * Always agreeable, 2630 * but ignored by now. 2631 */ 2632 sp->lcp.their_mrru = p[2] * 256 + p[3]; 2633 if (debug) 2634 addlog(" %ld", sp->lcp.their_mrru); 2635 continue; 2636 } 2637 if (rlen + l > blen) { 2638 if (debug) 2639 addlog(" [overflow]"); 2640 continue; 2641 } 2642 /* Add the option to nak'ed list. */ 2643 memcpy(r, p, l); 2644 r += l; 2645 rlen += l; 2646 } 2647 2648 if (rlen > 0) { 2649 if (++sp->scp[IDX_LCP].fail_counter >= sp->lcp.max_failure) { 2650 if (debug) 2651 addlog(" max_failure (%d) exceeded, ", 2652 sp->lcp.max_failure); 2653 type = CONF_REJ; 2654 } else { 2655 type = CONF_NAK; 2656 } 2657 } else { 2658 type = CONF_ACK; 2659 rlen = origlen; 2660 memcpy(r, h + 1, rlen); 2661 sp->scp[IDX_LCP].fail_counter = 0; 2662 sp->pp_loopcnt = 0; 2663 } 2664 2665 end: 2666 if (debug) 2667 addlog("\n"); 2668 2669 if (sp->scp[IDX_LCP].rcr_buf != NULL) { 2670 kmem_intr_free(sp->scp[IDX_LCP].rcr_buf, 2671 sp->scp[IDX_LCP].rcr_blen); 2672 } 2673 2674 if (rlen < 0) { 2675 kmem_intr_free(buf, blen); 2676 sp->scp[IDX_IPCP].rcr_buf = NULL; 2677 sp->scp[IDX_IPCP].rcr_rlen = 0; 2678 return -1; 2679 } 2680 2681 sp->scp[IDX_LCP].rcr_type = type; 2682 sp->scp[IDX_LCP].rcr_buf = buf; 2683 sp->scp[IDX_LCP].rcr_blen = blen; 2684 sp->scp[IDX_LCP].rcr_rlen = rlen; 2685 2686 if (type != CONF_ACK) 2687 return 0; 2688 return 1; 2689 } 2690 2691 /* 2692 * Analyze the LCP Configure-Reject option list, and adjust our 2693 * negotiation. 2694 */ 2695 static void 2696 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2697 { 2698 STDDCL; 2699 u_char *p, l; 2700 2701 KASSERT(SPPP_WLOCKED(sp)); 2702 2703 if (len <= sizeof(*h)) 2704 return; 2705 2706 len -= sizeof(*h); 2707 2708 if (debug) 2709 log(LOG_DEBUG, "%s: lcp rej opts:", 2710 ifp->if_xname); 2711 2712 p = (void *)(h + 1); 2713 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2714 /* Sanity check option length */ 2715 if (l > len) { 2716 /* 2717 * Malicious option - drop immediately. 2718 * XXX Maybe we should just RXJ it? 2719 */ 2720 addlog("%s: received malicious LCP option, " 2721 "dropping.\n", ifp->if_xname); 2722 goto end; 2723 } 2724 if (debug) 2725 addlog(" %s", sppp_lcp_opt_name(*p)); 2726 switch (p[0]) { 2727 case LCP_OPT_MAGIC: 2728 /* Magic number -- can't use it, use 0 */ 2729 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2730 sp->lcp.magic = 0; 2731 break; 2732 case LCP_OPT_MRU: 2733 /* 2734 * We try to negotiate a lower MRU if the underlying 2735 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2736 * peer rejects this lower rate, fallback to the 2737 * default. 2738 */ 2739 if (debug) { 2740 addlog("%s: warning: peer rejected our MRU of " 2741 "%ld bytes. Defaulting to %d bytes\n", 2742 ifp->if_xname, sp->lcp.mru, PP_MTU); 2743 } 2744 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2745 sp->lcp.mru = PP_MTU; 2746 break; 2747 case LCP_OPT_AUTH_PROTO: 2748 /* 2749 * Peer doesn't want to authenticate himself, 2750 * deny unless this is a dialout call, and 2751 * SPPP_AUTHFLAG_NOCALLOUT is set. 2752 */ 2753 if ((sp->pp_flags & PP_CALLIN) == 0 && 2754 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2755 if (debug) 2756 addlog(" [don't insist on auth " 2757 "for callout]"); 2758 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2759 break; 2760 } 2761 if (debug) 2762 addlog("[access denied]\n"); 2763 lcp.Close(sp); 2764 break; 2765 } 2766 } 2767 if (debug) 2768 addlog("\n"); 2769 end: 2770 return; 2771 } 2772 2773 /* 2774 * Analyze the LCP Configure-NAK option list, and adjust our 2775 * negotiation. 2776 */ 2777 static void 2778 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2779 { 2780 STDDCL; 2781 u_char *p, l; 2782 uint32_t magic; 2783 2784 KASSERT(SPPP_WLOCKED(sp)); 2785 2786 if (len <= sizeof(*h)) 2787 return; 2788 len -= sizeof(*h); 2789 2790 if (debug) 2791 log(LOG_DEBUG, "%s: lcp nak opts:", 2792 ifp->if_xname); 2793 2794 p = (void *)(h + 1); 2795 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2796 /* Sanity check option length */ 2797 if (l > len) { 2798 /* 2799 * Malicious option - drop immediately. 2800 * XXX Maybe we should just RXJ it? 2801 */ 2802 addlog("%s: received malicious LCP option, " 2803 "dropping.\n", ifp->if_xname); 2804 goto end; 2805 } 2806 if (debug) 2807 addlog(" %s", sppp_lcp_opt_name(*p)); 2808 switch (p[0]) { 2809 case LCP_OPT_MAGIC: 2810 /* Magic number -- renegotiate */ 2811 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2812 len >= 6 && l == 6) { 2813 magic = (uint32_t)p[2] << 24 | 2814 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2815 /* 2816 * If the remote magic is our negated one, 2817 * this looks like a loopback problem. 2818 * Suggest a new magic to make sure. 2819 */ 2820 if (magic == ~sp->lcp.magic) { 2821 if (debug) 2822 addlog(" magic glitch"); 2823 sp->lcp.magic = cprng_fast32(); 2824 } else { 2825 sp->lcp.magic = magic; 2826 if (debug) 2827 addlog(" %d", magic); 2828 } 2829 } 2830 break; 2831 case LCP_OPT_MRU: 2832 /* 2833 * Peer wants to advise us to negotiate an MRU. 2834 * Agree on it if it's reasonable, or use 2835 * default otherwise. 2836 */ 2837 if (len >= 4 && l == 4) { 2838 u_int mru = p[2] * 256 + p[3]; 2839 if (debug) 2840 addlog(" %d", mru); 2841 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2842 mru = sp->pp_if.if_mtu; 2843 sp->lcp.mru = mru; 2844 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2845 } 2846 break; 2847 case LCP_OPT_AUTH_PROTO: 2848 /* 2849 * Peer doesn't like our authentication method, 2850 * deny. 2851 */ 2852 if (debug) 2853 addlog("[access denied]\n"); 2854 lcp.Close(sp); 2855 break; 2856 } 2857 } 2858 if (debug) 2859 addlog("\n"); 2860 end: 2861 return; 2862 } 2863 2864 static void 2865 sppp_lcp_tlu(struct sppp *sp) 2866 { 2867 struct ifnet *ifp = &sp->pp_if; 2868 int i; 2869 uint32_t mask; 2870 2871 KASSERT(SPPP_WLOCKED(sp)); 2872 2873 /* XXX ? */ 2874 if (! (ifp->if_flags & IFF_UP) && 2875 (ifp->if_flags & IFF_RUNNING)) { 2876 /* Coming out of loopback mode. */ 2877 SPPP_UNLOCK(sp); 2878 if_up(ifp); 2879 SPPP_LOCK(sp, RW_WRITER); 2880 } 2881 2882 for (i = 0; i < IDX_COUNT; i++) 2883 if ((cps[i])->flags & CP_QUAL) 2884 (cps[i])->Open(sp); 2885 2886 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2887 (sp->pp_flags & PP_NEEDAUTH) != 0) 2888 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 2889 else 2890 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 2891 2892 /* 2893 * Open all authentication protocols. This is even required 2894 * if we already proceeded to network phase, since it might be 2895 * that remote wants us to authenticate, so we might have to 2896 * send a PAP request. Undesired authentication protocols 2897 * don't do anything when they get an Open event. 2898 */ 2899 for (i = 0; i < IDX_COUNT; i++) 2900 if ((cps[i])->flags & CP_AUTH) 2901 (cps[i])->Open(sp); 2902 2903 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2904 /* Notify all NCPs. */ 2905 for (i = 0; i < IDX_COUNT; i++) 2906 if ((cps[i])->flags & CP_NCP) 2907 (cps[i])->Open(sp); 2908 } 2909 2910 /* Send Up events to all started protos. */ 2911 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) { 2912 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2913 (cps[i])->Up(sp); 2914 } 2915 } 2916 2917 /* notify low-level driver of state change */ 2918 sppp_notify_chg_wlocked(sp); 2919 2920 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2921 /* if no NCP is starting, close down */ 2922 sppp_lcp_check_and_close(sp); 2923 } 2924 2925 static void 2926 sppp_lcp_tld(struct sppp *sp) 2927 { 2928 int i; 2929 uint32_t mask; 2930 2931 KASSERT(SPPP_WLOCKED(sp)); 2932 2933 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 2934 2935 /* 2936 * Take upper layers down. We send the Down event first and 2937 * the Close second to prevent the upper layers from sending 2938 * ``a flurry of terminate-request packets'', as the RFC 2939 * describes it. 2940 */ 2941 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) { 2942 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2943 (cps[i])->Down(sp); 2944 (cps[i])->Close(sp); 2945 } 2946 } 2947 } 2948 2949 static void 2950 sppp_lcp_tls(struct sppp *sp) 2951 { 2952 2953 KASSERT(SPPP_WLOCKED(sp)); 2954 2955 2956 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2957 printf("%s: authentication failed %d times, not retrying again\n", 2958 sp->pp_if.if_xname, sp->pp_auth_failures); 2959 2960 SPPP_UNLOCK(sp); 2961 if_down(&sp->pp_if); 2962 SPPP_LOCK(sp, RW_WRITER); 2963 return; 2964 } 2965 2966 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 2967 2968 /* Notify lower layer if desired. */ 2969 sppp_notify_tls_wlocked(sp); 2970 } 2971 2972 static void 2973 sppp_lcp_tlf(struct sppp *sp) 2974 { 2975 2976 KASSERT(SPPP_WLOCKED(sp)); 2977 2978 sppp_change_phase(sp, SPPP_PHASE_DEAD); 2979 2980 /* Notify lower layer if desired. */ 2981 sppp_notify_tlf_wlocked(sp); 2982 } 2983 2984 static void 2985 sppp_lcp_scr(struct sppp *sp) 2986 { 2987 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2988 int i = 0; 2989 u_short authproto; 2990 2991 KASSERT(SPPP_WLOCKED(sp)); 2992 2993 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2994 if (! sp->lcp.magic) 2995 sp->lcp.magic = cprng_fast32(); 2996 opt[i++] = LCP_OPT_MAGIC; 2997 opt[i++] = 6; 2998 opt[i++] = sp->lcp.magic >> 24; 2999 opt[i++] = sp->lcp.magic >> 16; 3000 opt[i++] = sp->lcp.magic >> 8; 3001 opt[i++] = sp->lcp.magic; 3002 } 3003 3004 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 3005 opt[i++] = LCP_OPT_MRU; 3006 opt[i++] = 4; 3007 opt[i++] = sp->lcp.mru >> 8; 3008 opt[i++] = sp->lcp.mru; 3009 } 3010 3011 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 3012 authproto = sp->hisauth.proto; 3013 opt[i++] = LCP_OPT_AUTH_PROTO; 3014 opt[i++] = authproto == PPP_CHAP? 5: 4; 3015 opt[i++] = authproto >> 8; 3016 opt[i++] = authproto; 3017 if (authproto == PPP_CHAP) 3018 opt[i++] = CHAP_MD5; 3019 } 3020 3021 sp->scp[IDX_LCP].confid = ++sp->scp[IDX_LCP].seq; 3022 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->scp[IDX_LCP].confid, i, &opt); 3023 } 3024 3025 /* 3026 * Check the open NCPs, return true if at least one NCP is open. 3027 */ 3028 static int 3029 sppp_ncp_check(struct sppp *sp) 3030 { 3031 int i, mask; 3032 3033 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 3034 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 3035 return 1; 3036 return 0; 3037 } 3038 3039 /* 3040 * Re-check the open NCPs and see if we should terminate the link. 3041 * Called by the NCPs during their tlf action handling. 3042 */ 3043 static void 3044 sppp_lcp_check_and_close(struct sppp *sp) 3045 { 3046 3047 KASSERT(SPPP_WLOCKED(sp)); 3048 3049 if (sp->pp_phase < SPPP_PHASE_NETWORK) 3050 /* don't bother, we are already going down */ 3051 return; 3052 3053 if (sppp_ncp_check(sp)) 3054 return; 3055 lcp.Close(sp); 3056 } 3057 3058 3059 /* 3060 *--------------------------------------------------------------------------* 3061 * * 3062 * The IPCP implementation. * 3063 * * 3064 *--------------------------------------------------------------------------* 3065 */ 3066 3067 static void 3068 sppp_ipcp_init(struct sppp *sp) 3069 { 3070 int error; 3071 3072 KASSERT(SPPP_WLOCKED(sp)); 3073 3074 sp->ipcp.opts = 0; 3075 sp->ipcp.flags = 0; 3076 sp->scp[IDX_IPCP].state = STATE_INITIAL; 3077 sp->scp[IDX_IPCP].fail_counter = 0; 3078 sp->scp[IDX_IPCP].seq = 0; 3079 sp->scp[IDX_IPCP].rseq = 0; 3080 callout_init(&sp->scp[IDX_IPCP].ch, CALLOUT_MPSAFE); 3081 3082 error = workqueue_create(&sp->ipcp.update_addrs_wq, "ipcp_addr", 3083 sppp_update_ip_addrs_work, sp, PRI_SOFTNET, IPL_NET, 0); 3084 if (error) 3085 panic("%s: update_addrs workqueue_create failed (%d)\n", 3086 __func__, error); 3087 sp->ipcp.update_addrs_q = pcq_create(IPCP_UPDATE_LIMIT, KM_SLEEP); 3088 3089 sp->ipcp.update_addrs_enqueued = 0; 3090 } 3091 3092 static void 3093 sppp_ipcp_up(struct sppp *sp) 3094 { 3095 KASSERT(SPPP_WLOCKED(sp)); 3096 sppp_up_event(&ipcp, sp); 3097 } 3098 3099 static void 3100 sppp_ipcp_down(struct sppp *sp) 3101 { 3102 KASSERT(SPPP_WLOCKED(sp)); 3103 sppp_down_event(&ipcp, sp); 3104 } 3105 3106 static void 3107 sppp_ipcp_open(struct sppp *sp) 3108 { 3109 STDDCL; 3110 uint32_t myaddr, hisaddr; 3111 3112 KASSERT(SPPP_WLOCKED(sp)); 3113 3114 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 3115 sp->ipcp.req_myaddr = 0; 3116 sp->ipcp.req_hisaddr = 0; 3117 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 3118 3119 #ifdef INET 3120 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3121 #else 3122 myaddr = hisaddr = 0; 3123 #endif 3124 /* 3125 * If we don't have his address, this probably means our 3126 * interface doesn't want to talk IP at all. (This could 3127 * be the case if somebody wants to speak only IPX, for 3128 * example.) Don't open IPCP in this case. 3129 */ 3130 if (hisaddr == 0) { 3131 /* XXX this message should go away */ 3132 if (debug) 3133 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 3134 ifp->if_xname); 3135 return; 3136 } 3137 3138 if (myaddr == 0) { 3139 /* 3140 * I don't have an assigned address, so i need to 3141 * negotiate my address. 3142 */ 3143 sp->ipcp.flags |= IPCP_MYADDR_DYN; 3144 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3145 } 3146 if (hisaddr == 1) { 3147 /* 3148 * XXX - remove this hack! 3149 * remote has no valid address, we need to get one assigned. 3150 */ 3151 sp->ipcp.flags |= IPCP_HISADDR_DYN; 3152 } 3153 sppp_open_event(&ipcp, sp); 3154 } 3155 3156 static void 3157 sppp_ipcp_close(struct sppp *sp) 3158 { 3159 3160 KASSERT(SPPP_WLOCKED(sp)); 3161 3162 sppp_close_event(&ipcp, sp); 3163 3164 #ifdef INET 3165 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 3166 /* 3167 * Some address was dynamic, clear it again. 3168 */ 3169 sppp_clear_ip_addrs(sp); 3170 #endif 3171 } 3172 3173 static void 3174 sppp_ipcp_TO(void *cookie) 3175 { 3176 struct sppp *sp = cookie; 3177 3178 SPPP_LOCK(sp, RW_WRITER); 3179 sppp_to_event(&ipcp, sp); 3180 SPPP_UNLOCK(sp); 3181 } 3182 3183 /* 3184 * Analyze a configure request. Return true if it was agreeable, and 3185 * caused action sca, false if it has been rejected or nak'ed, and 3186 * caused action scn. (The return value is used to make the state 3187 * transition decision in the state automaton.) 3188 */ 3189 static int 3190 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int origlen) 3191 { 3192 u_char *buf, *r, *p, l, blen, type; 3193 struct ifnet *ifp = &sp->pp_if; 3194 int rlen, len, debug = ifp->if_flags & IFF_DEBUG; 3195 uint32_t hisaddr, desiredaddr; 3196 3197 KASSERT(SPPP_WLOCKED(sp)); 3198 3199 if (origlen < sizeof(*h)) 3200 return 0; 3201 3202 origlen -= sizeof(*h); 3203 type = 0; 3204 3205 /* 3206 * Make sure to allocate a buf that can at least hold a 3207 * conf-nak with an `address' option. We might need it below. 3208 */ 3209 blen = MAX(6, origlen); 3210 3211 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 3212 if (buf == NULL) 3213 return 0; 3214 3215 /* pass 1: see if we can recognize them */ 3216 if (debug) 3217 log(LOG_DEBUG, "%s: ipcp parse opts:", 3218 ifp->if_xname); 3219 p = (void *)(h + 1); 3220 r = buf; 3221 rlen = 0; 3222 for (len = origlen; len > 1; len -= l, p += l) { 3223 l = p[1]; 3224 if (l == 0) 3225 break; 3226 3227 /* Sanity check option length */ 3228 if (l > len) { 3229 /* XXX should we just RXJ? */ 3230 addlog("%s: malicious IPCP option received, dropping\n", 3231 ifp->if_xname); 3232 rlen = -1; 3233 goto end; 3234 } 3235 if (debug) 3236 addlog(" %s", sppp_ipcp_opt_name(*p)); 3237 switch (p[0]) { 3238 #ifdef notyet 3239 case IPCP_OPT_COMPRESSION: 3240 if (len >= 6 && l >= 6) { 3241 /* correctly formed compress option */ 3242 continue; 3243 } 3244 if (debug) 3245 addlog(" [invalid]"); 3246 break; 3247 #endif 3248 case IPCP_OPT_ADDRESS: 3249 if (len >= 6 && l == 6) { 3250 /* correctly formed address option */ 3251 continue; 3252 } 3253 if (debug) 3254 addlog(" [invalid]"); 3255 break; 3256 default: 3257 /* Others not supported. */ 3258 if (debug) 3259 addlog(" [rej]"); 3260 break; 3261 } 3262 /* Add the option to rejected list. */ 3263 if (rlen + l > blen) { 3264 if (debug) 3265 addlog(" [overflow]"); 3266 continue; 3267 } 3268 memcpy(r, p, l); 3269 r += l; 3270 rlen += l; 3271 } 3272 3273 if (rlen > 0) { 3274 type = CONF_REJ; 3275 goto end; 3276 } 3277 3278 if (debug) 3279 addlog("\n"); 3280 3281 /* pass 2: parse option values */ 3282 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 3283 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 3284 else 3285 #ifdef INET 3286 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 3287 #else 3288 hisaddr = 0; 3289 #endif 3290 if (debug) 3291 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 3292 ifp->if_xname); 3293 p = (void *)(h + 1); 3294 r = buf; 3295 rlen = 0; 3296 for (len = origlen; len > 1; len -= l, p += l) { 3297 l = p[1]; 3298 if (l == 0) 3299 break; 3300 3301 if (debug) 3302 addlog(" %s", sppp_ipcp_opt_name(*p)); 3303 switch (p[0]) { 3304 #ifdef notyet 3305 case IPCP_OPT_COMPRESSION: 3306 continue; 3307 #endif 3308 case IPCP_OPT_ADDRESS: 3309 desiredaddr = p[2] << 24 | p[3] << 16 | 3310 p[4] << 8 | p[5]; 3311 if (desiredaddr == hisaddr || 3312 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 3313 /* 3314 * Peer's address is same as our value, 3315 * this is agreeable. Gonna conf-ack 3316 * it. 3317 */ 3318 if (debug) 3319 addlog(" %s [ack]", 3320 sppp_dotted_quad(hisaddr)); 3321 /* record that we've seen it already */ 3322 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3323 sp->ipcp.req_hisaddr = desiredaddr; 3324 hisaddr = desiredaddr; 3325 continue; 3326 } 3327 /* 3328 * The address wasn't agreeable. This is either 3329 * he sent us 0.0.0.0, asking to assign him an 3330 * address, or he send us another address not 3331 * matching our value. Either case, we gonna 3332 * conf-nak it with our value. 3333 */ 3334 if (debug) { 3335 if (desiredaddr == 0) 3336 addlog(" [addr requested]"); 3337 else 3338 addlog(" %s [not agreed]", 3339 sppp_dotted_quad(desiredaddr)); 3340 } 3341 3342 p[2] = hisaddr >> 24; 3343 p[3] = hisaddr >> 16; 3344 p[4] = hisaddr >> 8; 3345 p[5] = hisaddr; 3346 break; 3347 } 3348 if (rlen + l > blen) { 3349 if (debug) 3350 addlog(" [overflow]"); 3351 continue; 3352 } 3353 /* Add the option to nak'ed list. */ 3354 memcpy(r, p, l); 3355 r += l; 3356 rlen += l; 3357 } 3358 3359 if (rlen > 0) { 3360 type = CONF_NAK; 3361 } else { 3362 if ((sp->ipcp.flags & IPCP_HISADDR_SEEN) == 0) { 3363 /* 3364 * If we are about to conf-ack the request, but haven't seen 3365 * his address so far, gonna conf-nak it instead, with the 3366 * `address' option present and our idea of his address being 3367 * filled in there, to request negotiation of both addresses. 3368 * 3369 * XXX This can result in an endless req - nak loop if peer 3370 * doesn't want to send us his address. Q: What should we do 3371 * about it? XXX A: implement the max-failure counter. 3372 */ 3373 buf[0] = IPCP_OPT_ADDRESS; 3374 buf[1] = 6; 3375 buf[2] = hisaddr >> 24; 3376 buf[3] = hisaddr >> 16; 3377 buf[4] = hisaddr >> 8; 3378 buf[5] = hisaddr; 3379 rlen = 6; 3380 if (debug) 3381 addlog(" still need hisaddr"); 3382 type = CONF_NAK; 3383 } else { 3384 type = CONF_ACK; 3385 rlen = origlen; 3386 memcpy(r, h + 1, rlen); 3387 } 3388 } 3389 3390 end: 3391 if (debug) 3392 addlog("\n"); 3393 3394 if (rlen < 0) { 3395 kmem_intr_free(buf, blen); 3396 return -1; 3397 } 3398 3399 if (sp->scp[IDX_IPCP].rcr_buf != NULL) { 3400 kmem_intr_free(sp->scp[IDX_IPCP].rcr_buf, 3401 sp->scp[IDX_IPCP].rcr_blen); 3402 } 3403 3404 sp->scp[IDX_IPCP].rcr_type = type; 3405 sp->scp[IDX_IPCP].rcr_buf = buf; 3406 sp->scp[IDX_IPCP].rcr_blen = blen; 3407 sp->scp[IDX_IPCP].rcr_rlen = rlen; 3408 3409 if (type != CONF_ACK) 3410 return 0; 3411 return 1; 3412 } 3413 3414 /* 3415 * Analyze the IPCP Configure-Reject option list, and adjust our 3416 * negotiation. 3417 */ 3418 static void 3419 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3420 { 3421 u_char *p, l; 3422 struct ifnet *ifp = &sp->pp_if; 3423 int debug = ifp->if_flags & IFF_DEBUG; 3424 3425 KASSERT(SPPP_WLOCKED(sp)); 3426 3427 if (len <= sizeof(*h)) 3428 return; 3429 3430 len -= sizeof(*h); 3431 3432 if (debug) 3433 log(LOG_DEBUG, "%s: ipcp rej opts:", 3434 ifp->if_xname); 3435 3436 p = (void *)(h + 1); 3437 for (; len > 1; len -= l, p += l) { 3438 l = p[1]; 3439 if (l == 0) 3440 break; 3441 3442 /* Sanity check option length */ 3443 if (l > len) { 3444 /* XXX should we just RXJ? */ 3445 addlog("%s: malicious IPCP option received, dropping\n", 3446 ifp->if_xname); 3447 goto end; 3448 } 3449 if (debug) 3450 addlog(" %s", sppp_ipcp_opt_name(*p)); 3451 switch (p[0]) { 3452 case IPCP_OPT_ADDRESS: 3453 /* 3454 * Peer doesn't grok address option. This is 3455 * bad. XXX Should we better give up here? 3456 */ 3457 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3458 break; 3459 #ifdef notyet 3460 case IPCP_OPT_COMPRESS: 3461 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3462 break; 3463 #endif 3464 } 3465 } 3466 if (debug) 3467 addlog("\n"); 3468 end: 3469 return; 3470 } 3471 3472 /* 3473 * Analyze the IPCP Configure-NAK option list, and adjust our 3474 * negotiation. 3475 */ 3476 static void 3477 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3478 { 3479 u_char *p, l; 3480 struct ifnet *ifp = &sp->pp_if; 3481 int debug = ifp->if_flags & IFF_DEBUG; 3482 uint32_t wantaddr; 3483 3484 KASSERT(SPPP_WLOCKED(sp)); 3485 3486 len -= sizeof(*h); 3487 3488 if (debug) 3489 log(LOG_DEBUG, "%s: ipcp nak opts:", 3490 ifp->if_xname); 3491 3492 p = (void *)(h + 1); 3493 for (; len > 1; len -= l, p += l) { 3494 l = p[1]; 3495 if (l == 0) 3496 break; 3497 3498 /* Sanity check option length */ 3499 if (l > len) { 3500 /* XXX should we just RXJ? */ 3501 addlog("%s: malicious IPCP option received, dropping\n", 3502 ifp->if_xname); 3503 return; 3504 } 3505 if (debug) 3506 addlog(" %s", sppp_ipcp_opt_name(*p)); 3507 switch (*p) { 3508 case IPCP_OPT_ADDRESS: 3509 /* 3510 * Peer doesn't like our local IP address. See 3511 * if we can do something for him. We'll drop 3512 * him our address then. 3513 */ 3514 if (len >= 6 && l == 6) { 3515 wantaddr = p[2] << 24 | p[3] << 16 | 3516 p[4] << 8 | p[5]; 3517 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3518 if (debug) 3519 addlog(" [wantaddr %s]", 3520 sppp_dotted_quad(wantaddr)); 3521 /* 3522 * When doing dynamic address assignment, 3523 * we accept his offer. Otherwise, we 3524 * ignore it and thus continue to negotiate 3525 * our already existing value. 3526 */ 3527 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3528 if (debug) 3529 addlog(" [agree]"); 3530 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3531 sp->ipcp.req_myaddr = wantaddr; 3532 } 3533 } 3534 break; 3535 3536 case IPCP_OPT_PRIMDNS: 3537 if (len >= 6 && l == 6) { 3538 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3539 p[4] << 8 | p[5]; 3540 } 3541 break; 3542 3543 case IPCP_OPT_SECDNS: 3544 if (len >= 6 && l == 6) { 3545 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3546 p[4] << 8 | p[5]; 3547 } 3548 break; 3549 #ifdef notyet 3550 case IPCP_OPT_COMPRESS: 3551 /* 3552 * Peer wants different compression parameters. 3553 */ 3554 break; 3555 #endif 3556 } 3557 } 3558 if (debug) 3559 addlog("\n"); 3560 } 3561 3562 static void 3563 sppp_ipcp_tlu(struct sppp *sp) 3564 { 3565 #ifdef INET 3566 KASSERT(SPPP_WLOCKED(sp)); 3567 /* we are up. Set addresses and notify anyone interested */ 3568 sppp_set_ip_addrs(sp); 3569 #endif 3570 } 3571 3572 static void 3573 sppp_ipcp_tld(struct sppp *sp) 3574 { 3575 3576 KASSERT(SPPP_WLOCKED(sp)); 3577 } 3578 3579 static void 3580 sppp_ipcp_tls(struct sppp *sp) 3581 { 3582 3583 KASSERT(SPPP_WLOCKED(sp)); 3584 /* indicate to LCP that it must stay alive */ 3585 sp->lcp.protos |= (1 << IDX_IPCP); 3586 } 3587 3588 static void 3589 sppp_ipcp_tlf(struct sppp *sp) 3590 { 3591 3592 KASSERT(SPPP_WLOCKED(sp)); 3593 3594 /* we no longer need LCP */ 3595 sp->lcp.protos &= ~(1 << IDX_IPCP); 3596 } 3597 3598 static void 3599 sppp_ipcp_scr(struct sppp *sp) 3600 { 3601 uint8_t opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3602 #ifdef INET 3603 uint32_t ouraddr; 3604 #endif 3605 int i = 0; 3606 3607 KASSERT(SPPP_WLOCKED(sp)); 3608 3609 #ifdef notyet 3610 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3611 opt[i++] = IPCP_OPT_COMPRESSION; 3612 opt[i++] = 6; 3613 opt[i++] = 0; /* VJ header compression */ 3614 opt[i++] = 0x2d; /* VJ header compression */ 3615 opt[i++] = max_slot_id; 3616 opt[i++] = comp_slot_id; 3617 } 3618 #endif 3619 3620 #ifdef INET 3621 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3622 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3623 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3624 else 3625 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3626 opt[i++] = IPCP_OPT_ADDRESS; 3627 opt[i++] = 6; 3628 opt[i++] = ouraddr >> 24; 3629 opt[i++] = ouraddr >> 16; 3630 opt[i++] = ouraddr >> 8; 3631 opt[i++] = ouraddr; 3632 } 3633 #endif 3634 3635 if (sp->query_dns & 1) { 3636 opt[i++] = IPCP_OPT_PRIMDNS; 3637 opt[i++] = 6; 3638 opt[i++] = sp->dns_addrs[0] >> 24; 3639 opt[i++] = sp->dns_addrs[0] >> 16; 3640 opt[i++] = sp->dns_addrs[0] >> 8; 3641 opt[i++] = sp->dns_addrs[0]; 3642 } 3643 if (sp->query_dns & 2) { 3644 opt[i++] = IPCP_OPT_SECDNS; 3645 opt[i++] = 6; 3646 opt[i++] = sp->dns_addrs[1] >> 24; 3647 opt[i++] = sp->dns_addrs[1] >> 16; 3648 opt[i++] = sp->dns_addrs[1] >> 8; 3649 opt[i++] = sp->dns_addrs[1]; 3650 } 3651 3652 sp->scp[IDX_IPCP].confid = ++sp->scp[IDX_IPCP].seq; 3653 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->scp[IDX_IPCP].confid, i, &opt); 3654 } 3655 3656 3657 /* 3658 *--------------------------------------------------------------------------* 3659 * * 3660 * The IPv6CP implementation. * 3661 * * 3662 *--------------------------------------------------------------------------* 3663 */ 3664 3665 #ifdef INET6 3666 static void 3667 sppp_ipv6cp_init(struct sppp *sp) 3668 { 3669 3670 KASSERT(SPPP_WLOCKED(sp)); 3671 3672 sp->ipv6cp.opts = 0; 3673 sp->ipv6cp.flags = 0; 3674 sp->scp[IDX_IPV6CP].state = STATE_INITIAL; 3675 sp->scp[IDX_IPV6CP].fail_counter = 0; 3676 sp->scp[IDX_IPV6CP].seq = 0; 3677 sp->scp[IDX_IPV6CP].rseq = 0; 3678 callout_init(&sp->scp[IDX_IPV6CP].ch, CALLOUT_MPSAFE); 3679 } 3680 3681 static void 3682 sppp_ipv6cp_up(struct sppp *sp) 3683 { 3684 3685 KASSERT(SPPP_WLOCKED(sp)); 3686 sppp_up_event(&ipv6cp, sp); 3687 } 3688 3689 static void 3690 sppp_ipv6cp_down(struct sppp *sp) 3691 { 3692 3693 KASSERT(SPPP_WLOCKED(sp)); 3694 sppp_down_event(&ipv6cp, sp); 3695 } 3696 3697 static void 3698 sppp_ipv6cp_open(struct sppp *sp) 3699 { 3700 STDDCL; 3701 struct in6_addr myaddr, hisaddr; 3702 3703 KASSERT(SPPP_WLOCKED(sp)); 3704 3705 #ifdef IPV6CP_MYIFID_DYN 3706 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3707 #else 3708 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3709 #endif 3710 3711 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3712 /* 3713 * If we don't have our address, this probably means our 3714 * interface doesn't want to talk IPv6 at all. (This could 3715 * be the case if somebody wants to speak only IPX, for 3716 * example.) Don't open IPv6CP in this case. 3717 */ 3718 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3719 /* XXX this message should go away */ 3720 if (debug) 3721 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3722 ifp->if_xname); 3723 return; 3724 } 3725 3726 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3727 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3728 sppp_open_event(&ipv6cp, sp); 3729 } 3730 3731 static void 3732 sppp_ipv6cp_close(struct sppp *sp) 3733 { 3734 3735 KASSERT(SPPP_WLOCKED(sp)); 3736 sppp_close_event(&ipv6cp, sp); 3737 } 3738 3739 static void 3740 sppp_ipv6cp_TO(void *cookie) 3741 { 3742 struct sppp *sp = cookie; 3743 3744 SPPP_LOCK(sp, RW_WRITER); 3745 sppp_to_event(&ipv6cp, sp); 3746 SPPP_UNLOCK(sp); 3747 } 3748 3749 /* 3750 * Analyze a configure request. Return true if it was agreeable, and 3751 * caused action sca, false if it has been rejected or nak'ed, and 3752 * caused action scn. (The return value is used to make the state 3753 * transition decision in the state automaton.) 3754 */ 3755 static int 3756 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int origlen) 3757 { 3758 u_char *buf, *r, *p, l, blen; 3759 struct ifnet *ifp = &sp->pp_if; 3760 int rlen, len, debug = ifp->if_flags & IFF_DEBUG; 3761 struct in6_addr myaddr, desiredaddr, suggestaddr; 3762 int ifidcount; 3763 int type; 3764 int collision, nohisaddr; 3765 char ip6buf[INET6_ADDRSTRLEN]; 3766 3767 KASSERT(SPPP_WLOCKED(sp)); 3768 3769 if (origlen < sizeof(*h)) 3770 return 0; 3771 3772 origlen -= sizeof(*h); 3773 type = 0; 3774 3775 /* 3776 * Make sure to allocate a buf that can at least hold a 3777 * conf-nak with an `address' option. We might need it below. 3778 */ 3779 blen = MAX(6, origlen); 3780 3781 buf = kmem_intr_alloc(blen, KM_NOSLEEP); 3782 if (buf == NULL) 3783 return 0; 3784 3785 /* pass 1: see if we can recognize them */ 3786 if (debug) 3787 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3788 ifp->if_xname); 3789 p = (void *)(h + 1); 3790 r = buf; 3791 rlen = 0; 3792 ifidcount = 0; 3793 for (len = origlen; len > 1; len -= l, p += l) { 3794 l = p[1]; 3795 if (l == 0) 3796 break; 3797 3798 /* Sanity check option length */ 3799 if (l > len) { 3800 /* XXX just RXJ? */ 3801 addlog("%s: received malicious IPCPv6 option, " 3802 "dropping\n", ifp->if_xname); 3803 rlen = -1; 3804 goto end; 3805 } 3806 if (debug) 3807 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3808 switch (p[0]) { 3809 case IPV6CP_OPT_IFID: 3810 if (len >= 10 && l == 10 && ifidcount == 0) { 3811 /* correctly formed address option */ 3812 ifidcount++; 3813 continue; 3814 } 3815 if (debug) 3816 addlog(" [invalid]"); 3817 break; 3818 #ifdef notyet 3819 case IPV6CP_OPT_COMPRESSION: 3820 if (len >= 4 && l >= 4) { 3821 /* correctly formed compress option */ 3822 continue; 3823 } 3824 if (debug) 3825 addlog(" [invalid]"); 3826 break; 3827 #endif 3828 default: 3829 /* Others not supported. */ 3830 if (debug) 3831 addlog(" [rej]"); 3832 break; 3833 } 3834 if (rlen + l > blen) { 3835 if (debug) 3836 addlog(" [overflow]"); 3837 continue; 3838 } 3839 /* Add the option to rejected list. */ 3840 memcpy(r, p, l); 3841 r += l; 3842 rlen += l; 3843 } 3844 3845 if (rlen > 0) { 3846 type = CONF_REJ; 3847 goto end; 3848 } 3849 3850 if (debug) 3851 addlog("\n"); 3852 3853 /* pass 2: parse option values */ 3854 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3855 if (debug) 3856 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3857 ifp->if_xname); 3858 p = (void *)(h + 1); 3859 r = buf; 3860 rlen = 0; 3861 type = CONF_ACK; 3862 for (len = origlen; len > 1; len -= l, p += l) { 3863 l = p[1]; 3864 if (l == 0) 3865 break; 3866 3867 if (debug) 3868 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3869 switch (p[0]) { 3870 #ifdef notyet 3871 case IPV6CP_OPT_COMPRESSION: 3872 continue; 3873 #endif 3874 case IPV6CP_OPT_IFID: 3875 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3876 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3877 collision = (memcmp(&desiredaddr.s6_addr[8], 3878 &myaddr.s6_addr[8], 8) == 0); 3879 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3880 3881 desiredaddr.s6_addr16[0] = htons(0xfe80); 3882 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3883 3884 if (!collision && !nohisaddr) { 3885 /* no collision, hisaddr known - Conf-Ack */ 3886 type = CONF_ACK; 3887 3888 if (debug) { 3889 addlog(" %s [%s]", 3890 IN6_PRINT(ip6buf, &desiredaddr), 3891 sppp_cp_type_name(type)); 3892 } 3893 continue; 3894 } 3895 3896 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3897 if (collision && nohisaddr) { 3898 /* collision, hisaddr unknown - Conf-Rej */ 3899 type = CONF_REJ; 3900 memset(&p[2], 0, 8); 3901 } else { 3902 /* 3903 * - no collision, hisaddr unknown, or 3904 * - collision, hisaddr known 3905 * Conf-Nak, suggest hisaddr 3906 */ 3907 type = CONF_NAK; 3908 sppp_suggest_ip6_addr(sp, &suggestaddr); 3909 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3910 } 3911 if (debug) 3912 addlog(" %s [%s]", IN6_PRINT(ip6buf, &desiredaddr), 3913 sppp_cp_type_name(type)); 3914 break; 3915 } 3916 if (rlen + l > blen) { 3917 if (debug) 3918 addlog(" [overflow]"); 3919 continue; 3920 } 3921 /* Add the option to nak'ed list. */ 3922 memcpy(r, p, l); 3923 r += l; 3924 rlen += l; 3925 } 3926 3927 if (rlen > 0) { 3928 if (type != CONF_ACK) { 3929 if (debug) { 3930 addlog(" send %s suggest %s\n", 3931 sppp_cp_type_name(type), 3932 IN6_PRINT(ip6buf, &suggestaddr)); 3933 } 3934 } 3935 #ifdef notdef 3936 if (type == CONF_ACK) 3937 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3938 #endif 3939 } else { 3940 if (type == CONF_ACK) { 3941 rlen = origlen; 3942 memcpy(r, h + 1, rlen); 3943 } 3944 } 3945 end: 3946 if (debug) 3947 addlog("\n"); 3948 3949 if (rlen < 0) { 3950 kmem_intr_free(buf, blen); 3951 return -1; 3952 } 3953 3954 if (sp->scp[IDX_IPV6CP].rcr_buf != NULL) { 3955 kmem_intr_free(sp->scp[IDX_IPV6CP].rcr_buf, 3956 sp->scp[IDX_IPV6CP].rcr_blen); 3957 } 3958 3959 sp->scp[IDX_IPV6CP].rcr_type = type; 3960 sp->scp[IDX_IPV6CP].rcr_buf = buf; 3961 sp->scp[IDX_IPV6CP].rcr_blen = blen; 3962 sp->scp[IDX_IPV6CP].rcr_rlen = rlen; 3963 3964 if (type != CONF_ACK) 3965 return 0; 3966 return 0; 3967 } 3968 3969 /* 3970 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3971 * negotiation. 3972 */ 3973 static void 3974 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3975 { 3976 u_char *p, l; 3977 struct ifnet *ifp = &sp->pp_if; 3978 int debug = ifp->if_flags & IFF_DEBUG; 3979 3980 KASSERT(SPPP_WLOCKED(sp)); 3981 3982 if (len <= sizeof(*h)) 3983 return; 3984 3985 len -= sizeof(*h); 3986 3987 if (debug) 3988 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3989 ifp->if_xname); 3990 3991 p = (void *)(h + 1); 3992 for (; len > 1; len -= l, p += l) { 3993 l = p[1]; 3994 if (l == 0) 3995 break; 3996 3997 if (l > len) { 3998 /* XXX just RXJ? */ 3999 addlog("%s: received malicious IPCPv6 option, " 4000 "dropping\n", ifp->if_xname); 4001 goto end; 4002 } 4003 if (debug) 4004 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 4005 switch (p[0]) { 4006 case IPV6CP_OPT_IFID: 4007 /* 4008 * Peer doesn't grok address option. This is 4009 * bad. XXX Should we better give up here? 4010 */ 4011 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 4012 break; 4013 #ifdef notyet 4014 case IPV6CP_OPT_COMPRESS: 4015 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 4016 break; 4017 #endif 4018 } 4019 } 4020 if (debug) 4021 addlog("\n"); 4022 end: 4023 return; 4024 } 4025 4026 /* 4027 * Analyze the IPv6CP Configure-NAK option list, and adjust our 4028 * negotiation. 4029 */ 4030 static void 4031 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 4032 { 4033 u_char *p, l; 4034 struct ifnet *ifp = &sp->pp_if; 4035 int debug = ifp->if_flags & IFF_DEBUG; 4036 struct in6_addr suggestaddr; 4037 char ip6buf[INET6_ADDRSTRLEN]; 4038 4039 KASSERT(SPPP_WLOCKED(sp)); 4040 4041 if (len <= sizeof(*h)) 4042 return; 4043 4044 len -= sizeof(*h); 4045 4046 if (debug) 4047 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 4048 ifp->if_xname); 4049 4050 p = (void *)(h + 1); 4051 for (; len > 1; len -= l, p += l) { 4052 l = p[1]; 4053 if (l == 0) 4054 break; 4055 4056 if (l > len) { 4057 /* XXX just RXJ? */ 4058 addlog("%s: received malicious IPCPv6 option, " 4059 "dropping\n", ifp->if_xname); 4060 goto end; 4061 } 4062 if (debug) 4063 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 4064 switch (p[0]) { 4065 case IPV6CP_OPT_IFID: 4066 /* 4067 * Peer doesn't like our local ifid. See 4068 * if we can do something for him. We'll drop 4069 * him our address then. 4070 */ 4071 if (len < 10 || l != 10) 4072 break; 4073 memset(&suggestaddr, 0, sizeof(suggestaddr)); 4074 suggestaddr.s6_addr16[0] = htons(0xfe80); 4075 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 4076 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 4077 4078 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 4079 if (debug) 4080 addlog(" [suggestaddr %s]", 4081 IN6_PRINT(ip6buf, &suggestaddr)); 4082 #ifdef IPV6CP_MYIFID_DYN 4083 /* 4084 * When doing dynamic address assignment, 4085 * we accept his offer. 4086 */ 4087 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 4088 struct in6_addr lastsuggest; 4089 /* 4090 * If <suggested myaddr from peer> equals to 4091 * <hisaddr we have suggested last time>, 4092 * we have a collision. generate new random 4093 * ifid. 4094 */ 4095 sppp_suggest_ip6_addr(&lastsuggest); 4096 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 4097 lastsuggest)) { 4098 if (debug) 4099 addlog(" [random]"); 4100 sppp_gen_ip6_addr(sp, &suggestaddr); 4101 } 4102 sppp_set_ip6_addr(sp, &suggestaddr, 0); 4103 if (debug) 4104 addlog(" [agree]"); 4105 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 4106 } 4107 #else 4108 /* 4109 * Since we do not do dynamic address assignment, 4110 * we ignore it and thus continue to negotiate 4111 * our already existing value. This can possibly 4112 * go into infinite request-reject loop. 4113 * 4114 * This is not likely because we normally use 4115 * ifid based on MAC-address. 4116 * If you have no ethernet card on the node, too bad. 4117 * XXX should we use fail_counter? 4118 */ 4119 #endif 4120 break; 4121 #ifdef notyet 4122 case IPV6CP_OPT_COMPRESS: 4123 /* 4124 * Peer wants different compression parameters. 4125 */ 4126 break; 4127 #endif 4128 } 4129 } 4130 if (debug) 4131 addlog("\n"); 4132 end: 4133 return; 4134 } 4135 4136 static void 4137 sppp_ipv6cp_tlu(struct sppp *sp) 4138 { 4139 4140 KASSERT(SPPP_WLOCKED(sp)); 4141 /* we are up - notify isdn daemon */ 4142 sppp_notify_con_wlocked(sp); 4143 } 4144 4145 static void 4146 sppp_ipv6cp_tld(struct sppp *sp) 4147 { 4148 4149 KASSERT(SPPP_WLOCKED(sp)); 4150 } 4151 4152 static void 4153 sppp_ipv6cp_tls(struct sppp *sp) 4154 { 4155 4156 KASSERT(SPPP_WLOCKED(sp)); 4157 /* indicate to LCP that it must stay alive */ 4158 sp->lcp.protos |= (1 << IDX_IPV6CP); 4159 } 4160 4161 static void 4162 sppp_ipv6cp_tlf(struct sppp *sp) 4163 { 4164 4165 KASSERT(SPPP_WLOCKED(sp)); 4166 /* we no longer need LCP */ 4167 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 4168 } 4169 4170 static void 4171 sppp_ipv6cp_scr(struct sppp *sp) 4172 { 4173 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 4174 struct in6_addr ouraddr; 4175 int i = 0; 4176 4177 KASSERT(SPPP_WLOCKED(sp)); 4178 4179 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 4180 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 4181 opt[i++] = IPV6CP_OPT_IFID; 4182 opt[i++] = 10; 4183 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 4184 i += 8; 4185 } 4186 4187 #ifdef notyet 4188 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 4189 opt[i++] = IPV6CP_OPT_COMPRESSION; 4190 opt[i++] = 4; 4191 opt[i++] = 0; /* TBD */ 4192 opt[i++] = 0; /* TBD */ 4193 /* variable length data may follow */ 4194 } 4195 #endif 4196 4197 sp->scp[IDX_IPV6CP].confid = ++sp->scp[IDX_IPV6CP].seq; 4198 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->scp[IDX_IPV6CP].confid, i, &opt); 4199 } 4200 #else /*INET6*/ 4201 static void 4202 sppp_ipv6cp_init(struct sppp *sp) 4203 { 4204 4205 KASSERT(SPPP_WLOCKED(sp)); 4206 } 4207 4208 static void 4209 sppp_ipv6cp_up(struct sppp *sp) 4210 { 4211 4212 KASSERT(SPPP_WLOCKED(sp)); 4213 } 4214 4215 static void 4216 sppp_ipv6cp_down(struct sppp *sp) 4217 { 4218 4219 KASSERT(SPPP_WLOCKED(sp)); 4220 } 4221 4222 static void 4223 sppp_ipv6cp_open(struct sppp *sp) 4224 { 4225 4226 KASSERT(SPPP_WLOCKED(sp)); 4227 } 4228 4229 static void 4230 sppp_ipv6cp_close(struct sppp *sp) 4231 { 4232 4233 KASSERT(SPPP_WLOCKED(sp)); 4234 } 4235 4236 static void 4237 sppp_ipv6cp_TO(void *cookie) 4238 { 4239 struct sppp *sp __diagused = cookie; 4240 4241 KASSERT(SPPP_WLOCKED(sp)); 4242 } 4243 4244 static int 4245 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 4246 int len) 4247 { 4248 4249 KASSERT(SPPP_WLOCKED(sp)); 4250 return 0; 4251 } 4252 4253 static void 4254 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 4255 int len) 4256 { 4257 4258 KASSERT(SPPP_WLOCKED(sp)); 4259 } 4260 4261 static void 4262 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 4263 int len) 4264 { 4265 4266 KASSERT(SPPP_WLOCKED(sp)); 4267 } 4268 4269 static void 4270 sppp_ipv6cp_tlu(struct sppp *sp) 4271 { 4272 4273 KASSERT(SPPP_WLOCKED(sp)); 4274 } 4275 4276 static void 4277 sppp_ipv6cp_tld(struct sppp *sp) 4278 { 4279 4280 KASSERT(SPPP_WLOCKED(sp)); 4281 } 4282 4283 static void 4284 sppp_ipv6cp_tls(struct sppp *sp) 4285 { 4286 4287 KASSERT(SPPP_WLOCKED(sp)); 4288 } 4289 4290 static void 4291 sppp_ipv6cp_tlf(struct sppp *sp) 4292 { 4293 4294 KASSERT(SPPP_WLOCKED(sp)); 4295 } 4296 4297 static void 4298 sppp_ipv6cp_scr(struct sppp *sp) 4299 { 4300 4301 KASSERT(SPPP_WLOCKED(sp)); 4302 } 4303 #endif /*INET6*/ 4304 4305 4306 /* 4307 *--------------------------------------------------------------------------* 4308 * * 4309 * The CHAP implementation. * 4310 * * 4311 *--------------------------------------------------------------------------* 4312 */ 4313 4314 /* 4315 * The authentication protocols don't employ a full-fledged state machine as 4316 * the control protocols do, since they do have Open and Close events, but 4317 * not Up and Down, nor are they explicitly terminated. Also, use of the 4318 * authentication protocols may be different in both directions (this makes 4319 * sense, think of a machine that never accepts incoming calls but only 4320 * calls out, it doesn't require the called party to authenticate itself). 4321 * 4322 * Our state machine for the local authentication protocol (we are requesting 4323 * the peer to authenticate) looks like: 4324 * 4325 * RCA- 4326 * +--------------------------------------------+ 4327 * V scn,tld| 4328 * +--------+ Close +---------+ RCA+ 4329 * | |<----------------------------------| |------+ 4330 * +--->| Closed | TO* | Opened | sca | 4331 * | | |-----+ +-------| |<-----+ 4332 * | +--------+ irc | | +---------+ 4333 * | ^ | | ^ 4334 * | | | | | 4335 * | | | | | 4336 * | TO-| | | | 4337 * | |tld TO+ V | | 4338 * | | +------->+ | | 4339 * | | | | | | 4340 * | +--------+ V | | 4341 * | | |<----+<--------------------+ | 4342 * | | Req- | scr | 4343 * | | Sent | | 4344 * | | | | 4345 * | +--------+ | 4346 * | RCA- | | RCA+ | 4347 * +------+ +------------------------------------------+ 4348 * scn,tld sca,irc,ict,tlu 4349 * 4350 * 4351 * with: 4352 * 4353 * Open: LCP reached authentication phase 4354 * Close: LCP reached terminate phase 4355 * 4356 * RCA+: received reply (pap-req, chap-response), acceptable 4357 * RCN: received reply (pap-req, chap-response), not acceptable 4358 * TO+: timeout with restart counter >= 0 4359 * TO-: timeout with restart counter < 0 4360 * TO*: reschedule timeout for CHAP 4361 * 4362 * scr: send request packet (none for PAP, chap-challenge) 4363 * sca: send ack packet (pap-ack, chap-success) 4364 * scn: send nak packet (pap-nak, chap-failure) 4365 * ict: initialize re-challenge timer (CHAP only) 4366 * 4367 * tlu: this-layer-up, LCP reaches network phase 4368 * tld: this-layer-down, LCP enters terminate phase 4369 * 4370 * Note that in CHAP mode, after sending a new challenge, while the state 4371 * automaton falls back into Req-Sent state, it doesn't signal a tld 4372 * event to LCP, so LCP remains in network phase. Only after not getting 4373 * any response (or after getting an unacceptable response), CHAP closes, 4374 * causing LCP to enter terminate phase. 4375 * 4376 * With PAP, there is no initial request that can be sent. The peer is 4377 * expected to send one based on the successful negotiation of PAP as 4378 * the authentication protocol during the LCP option negotiation. 4379 * 4380 * Incoming authentication protocol requests (remote requests 4381 * authentication, we are peer) don't employ a state machine at all, 4382 * they are simply answered. Some peers [Ascend P50 firmware rev 4383 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 4384 * still in authentication phase (thereby violating the standard that 4385 * demands that these NCP packets are to be discarded), so we keep 4386 * track of the peer demanding us to authenticate, and only proceed to 4387 * phase network once we've seen a positive acknowledge for the 4388 * authentication. 4389 */ 4390 4391 /* 4392 * Handle incoming CHAP packets. 4393 */ 4394 void 4395 sppp_chap_input(struct sppp *sp, struct mbuf *m) 4396 { 4397 STDDCL; 4398 struct lcp_header *h; 4399 int len, x; 4400 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 4401 int value_len, name_len; 4402 MD5_CTX ctx; 4403 4404 len = m->m_pkthdr.len; 4405 if (len < 4) { 4406 if (debug) 4407 log(LOG_DEBUG, 4408 "%s: chap invalid packet length: %d bytes\n", 4409 ifp->if_xname, len); 4410 return; 4411 } 4412 h = mtod(m, struct lcp_header *); 4413 if (len > ntohs(h->len)) 4414 len = ntohs(h->len); 4415 4416 SPPP_LOCK(sp, RW_WRITER); 4417 4418 switch (h->type) { 4419 /* challenge, failure and success are his authproto */ 4420 case CHAP_CHALLENGE: 4421 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4422 /* can't do anything useful */ 4423 sp->pp_auth_failures++; 4424 printf("%s: chap input without my name and my secret being set\n", 4425 ifp->if_xname); 4426 break; 4427 } 4428 value = 1 + (u_char *)(h + 1); 4429 value_len = value[-1]; 4430 name = value + value_len; 4431 name_len = len - value_len - 5; 4432 if (name_len < 0) { 4433 if (debug) { 4434 log(LOG_DEBUG, 4435 "%s: chap corrupted challenge " 4436 "<%s id=0x%x len=%d", 4437 ifp->if_xname, 4438 sppp_auth_type_name(PPP_CHAP, h->type), 4439 h->ident, ntohs(h->len)); 4440 if (len > 4) 4441 sppp_print_bytes((u_char *)(h + 1), 4442 len - 4); 4443 addlog(">\n"); 4444 } 4445 break; 4446 } 4447 4448 if (debug) { 4449 log(LOG_DEBUG, 4450 "%s: chap input <%s id=0x%x len=%d name=", 4451 ifp->if_xname, 4452 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 4453 ntohs(h->len)); 4454 sppp_print_string((char *) name, name_len); 4455 addlog(" value-size=%d value=", value_len); 4456 sppp_print_bytes(value, value_len); 4457 addlog(">\n"); 4458 } 4459 4460 /* Compute reply value. */ 4461 MD5Init(&ctx); 4462 MD5Update(&ctx, &h->ident, 1); 4463 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 4464 MD5Update(&ctx, value, value_len); 4465 MD5Final(digest, &ctx); 4466 dsize = sizeof digest; 4467 4468 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 4469 sizeof dsize, (const char *)&dsize, 4470 sizeof digest, digest, 4471 sp->myauth.name_len, 4472 sp->myauth.name, 4473 0); 4474 break; 4475 4476 case CHAP_SUCCESS: 4477 if (debug) { 4478 log(LOG_DEBUG, "%s: chap success", 4479 ifp->if_xname); 4480 if (len > 4) { 4481 addlog(": "); 4482 sppp_print_string((char *)(h + 1), len - 4); 4483 } 4484 addlog("\n"); 4485 } 4486 x = splnet(); 4487 sp->pp_auth_failures = 0; 4488 sp->pp_flags &= ~PP_NEEDAUTH; 4489 if (sp->myauth.proto == PPP_CHAP && 4490 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4491 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 4492 /* 4493 * We are authenticator for CHAP but didn't 4494 * complete yet. Leave it to tlu to proceed 4495 * to network phase. 4496 */ 4497 splx(x); 4498 break; 4499 } 4500 splx(x); 4501 sppp_phase_network(sp); 4502 break; 4503 4504 case CHAP_FAILURE: 4505 x = splnet(); 4506 sp->pp_auth_failures++; 4507 splx(x); 4508 if (debug) { 4509 log(LOG_INFO, "%s: chap failure", 4510 ifp->if_xname); 4511 if (len > 4) { 4512 addlog(": "); 4513 sppp_print_string((char *)(h + 1), len - 4); 4514 } 4515 addlog("\n"); 4516 } else 4517 log(LOG_INFO, "%s: chap failure\n", 4518 ifp->if_xname); 4519 /* await LCP shutdown by authenticator */ 4520 break; 4521 4522 /* response is my authproto */ 4523 case CHAP_RESPONSE: 4524 if (sp->hisauth.secret == NULL) { 4525 /* can't do anything useful */ 4526 printf("%s: chap input without his secret being set\n", 4527 ifp->if_xname); 4528 break; 4529 } 4530 value = 1 + (u_char *)(h + 1); 4531 value_len = value[-1]; 4532 name = value + value_len; 4533 name_len = len - value_len - 5; 4534 if (name_len < 0) { 4535 if (debug) { 4536 log(LOG_DEBUG, 4537 "%s: chap corrupted response " 4538 "<%s id=0x%x len=%d", 4539 ifp->if_xname, 4540 sppp_auth_type_name(PPP_CHAP, h->type), 4541 h->ident, ntohs(h->len)); 4542 if (len > 4) 4543 sppp_print_bytes((u_char *)(h + 1), 4544 len - 4); 4545 addlog(">\n"); 4546 } 4547 break; 4548 } 4549 if (h->ident != sp->scp[IDX_CHAP].confid) { 4550 if (debug) 4551 log(LOG_DEBUG, 4552 "%s: chap dropping response for old ID " 4553 "(got %d, expected %d)\n", 4554 ifp->if_xname, 4555 h->ident, sp->scp[IDX_CHAP].confid); 4556 break; 4557 } 4558 if (sp->hisauth.name != NULL && 4559 (name_len != sp->hisauth.name_len 4560 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4561 log(LOG_INFO, "%s: chap response, his name ", 4562 ifp->if_xname); 4563 sppp_print_string(name, name_len); 4564 addlog(" != expected "); 4565 sppp_print_string(sp->hisauth.name, 4566 sp->hisauth.name_len); 4567 addlog("\n"); 4568 goto chap_failure; 4569 } 4570 if (debug) { 4571 log(LOG_DEBUG, "%s: chap input(%s) " 4572 "<%s id=0x%x len=%d name=", 4573 ifp->if_xname, 4574 sppp_state_name(sp->scp[IDX_CHAP].state), 4575 sppp_auth_type_name(PPP_CHAP, h->type), 4576 h->ident, ntohs(h->len)); 4577 sppp_print_string((char *)name, name_len); 4578 addlog(" value-size=%d value=", value_len); 4579 sppp_print_bytes(value, value_len); 4580 addlog(">\n"); 4581 } 4582 if (value_len != sizeof(sp->hisauth.challenge)) { 4583 if (debug) 4584 log(LOG_DEBUG, 4585 "%s: chap bad hash value length: " 4586 "%d bytes, should be %zu\n", 4587 ifp->if_xname, value_len, 4588 sizeof(sp->hisauth.challenge)); 4589 goto chap_failure; 4590 } 4591 4592 MD5Init(&ctx); 4593 MD5Update(&ctx, &h->ident, 1); 4594 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4595 MD5Update(&ctx, sp->hisauth.challenge, sizeof(sp->hisauth.challenge)); 4596 MD5Final(digest, &ctx); 4597 4598 #define FAILMSG "Failed..." 4599 #define SUCCMSG "Welcome!" 4600 4601 if (value_len != sizeof digest || 4602 memcmp(digest, value, value_len) != 0) { 4603 chap_failure: 4604 KASSERT(SPPP_WLOCKED(sp)); 4605 /* action scn, tld */ 4606 sp->pp_auth_failures++; 4607 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4608 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4609 0); 4610 chap.tld(sp); 4611 break; 4612 } 4613 sp->pp_auth_failures = 0; 4614 /* action sca, perhaps tlu */ 4615 if (sp->scp[IDX_CHAP].state == STATE_REQ_SENT || 4616 sp->scp[IDX_CHAP].state == STATE_OPENED) 4617 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4618 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4619 0); 4620 if (sp->scp[IDX_CHAP].state == STATE_REQ_SENT) { 4621 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4622 chap.tlu(sp); 4623 } 4624 break; 4625 4626 default: 4627 /* Unknown CHAP packet type -- ignore. */ 4628 if (debug) { 4629 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4630 "<0x%x id=0x%xh len=%d", 4631 ifp->if_xname, 4632 sppp_state_name(sp->scp[IDX_CHAP].state), 4633 h->type, h->ident, ntohs(h->len)); 4634 if (len > 4) 4635 sppp_print_bytes((u_char *)(h + 1), len - 4); 4636 addlog(">\n"); 4637 } 4638 break; 4639 4640 } 4641 4642 SPPP_UNLOCK(sp); 4643 } 4644 4645 static void 4646 sppp_chap_init(struct sppp *sp) 4647 { 4648 4649 KASSERT(SPPP_WLOCKED(sp)); 4650 4651 /* Chap doesn't have STATE_INITIAL at all. */ 4652 sp->scp[IDX_CHAP].state = STATE_CLOSED; 4653 sp->scp[IDX_CHAP].fail_counter = 0; 4654 sp->scp[IDX_CHAP].seq = 0; 4655 sp->scp[IDX_CHAP].rseq = 0; 4656 callout_init(&sp->scp[IDX_CHAP].ch, CALLOUT_MPSAFE); 4657 } 4658 4659 static void 4660 sppp_chap_open(struct sppp *sp) 4661 { 4662 4663 KASSERT(SPPP_WLOCKED(sp)); 4664 if (sp->hisauth.proto == PPP_CHAP && 4665 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4666 /* we are authenticator for CHAP, start it */ 4667 chap.scr(sp); 4668 sp->scp[IDX_CHAP].rst_counter = sp->lcp.max_configure; 4669 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4670 } 4671 /* nothing to be done if we are peer, await a challenge */ 4672 } 4673 4674 static void 4675 sppp_chap_close(struct sppp *sp) 4676 { 4677 4678 KASSERT(SPPP_WLOCKED(sp)); 4679 if (sp->scp[IDX_CHAP].state != STATE_CLOSED) 4680 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4681 } 4682 4683 static void 4684 sppp_chap_TO(void *cookie) 4685 { 4686 struct sppp *sp = (struct sppp *)cookie; 4687 STDDCL; 4688 int s; 4689 4690 s = splnet(); 4691 4692 SPPP_LOCK(sp, RW_WRITER); 4693 4694 if (debug) 4695 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4696 ifp->if_xname, 4697 sppp_state_name(sp->scp[IDX_CHAP].state), 4698 sp->scp[IDX_CHAP].rst_counter); 4699 4700 if (--sp->scp[IDX_CHAP].rst_counter < 0) 4701 /* TO- event */ 4702 switch (sp->scp[IDX_CHAP].state) { 4703 case STATE_REQ_SENT: 4704 chap.tld(sp); 4705 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4706 break; 4707 } 4708 else 4709 /* TO+ (or TO*) event */ 4710 switch (sp->scp[IDX_CHAP].state) { 4711 case STATE_OPENED: 4712 /* TO* event */ 4713 sp->scp[IDX_CHAP].rst_counter = sp->lcp.max_configure; 4714 /* fall through */ 4715 case STATE_REQ_SENT: 4716 chap.scr(sp); 4717 /* sppp_cp_change_state() will restart the timer */ 4718 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4719 break; 4720 } 4721 4722 SPPP_UNLOCK(sp); 4723 splx(s); 4724 } 4725 4726 static void 4727 sppp_chap_tlu(struct sppp *sp) 4728 { 4729 STDDCL; 4730 int i, x; 4731 4732 KASSERT(SPPP_WLOCKED(sp)); 4733 4734 i = 0; 4735 sp->scp[IDX_CHAP].rst_counter = sp->lcp.max_configure; 4736 4737 /* 4738 * Some broken CHAP implementations (Conware CoNet, firmware 4739 * 4.0.?) don't want to re-authenticate their CHAP once the 4740 * initial challenge-response exchange has taken place. 4741 * Provide for an option to avoid rechallenges. 4742 */ 4743 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4744 /* 4745 * Compute the re-challenge timeout. This will yield 4746 * a number between 300 and 810 seconds. 4747 */ 4748 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4749 4750 callout_reset(&sp->scp[IDX_CHAP].ch, i * hz, chap.TO, sp); 4751 } 4752 4753 if (debug) { 4754 log(LOG_DEBUG, 4755 "%s: chap %s, ", 4756 ifp->if_xname, 4757 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4758 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4759 addlog("next re-challenge in %d seconds\n", i); 4760 else 4761 addlog("re-challenging suppressed\n"); 4762 } 4763 4764 x = splnet(); 4765 sp->pp_auth_failures = 0; 4766 /* indicate to LCP that we need to be closed down */ 4767 sp->lcp.protos |= (1 << IDX_CHAP); 4768 4769 if (sp->pp_flags & PP_NEEDAUTH) { 4770 /* 4771 * Remote is authenticator, but his auth proto didn't 4772 * complete yet. Defer the transition to network 4773 * phase. 4774 */ 4775 splx(x); 4776 return; 4777 } 4778 splx(x); 4779 4780 /* 4781 * If we are already in phase network, we are done here. This 4782 * is the case if this is a dummy tlu event after a re-challenge. 4783 */ 4784 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4785 sppp_phase_network(sp); 4786 } 4787 4788 static void 4789 sppp_chap_tld(struct sppp *sp) 4790 { 4791 STDDCL; 4792 4793 KASSERT(SPPP_WLOCKED(sp)); 4794 4795 if (debug) 4796 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4797 callout_stop(&sp->scp[IDX_CHAP].ch); 4798 sp->lcp.protos &= ~(1 << IDX_CHAP); 4799 4800 lcp.Close(sp); 4801 } 4802 4803 static void 4804 sppp_chap_scr(struct sppp *sp) 4805 { 4806 uint32_t *ch; 4807 u_char clen = 4 * sizeof(uint32_t); 4808 4809 KASSERT(SPPP_WLOCKED(sp)); 4810 4811 if (sp->hisauth.name == NULL) { 4812 /* can't do anything useful */ 4813 printf("%s: chap starting without his name being set\n", 4814 sp->pp_if.if_xname); 4815 return; 4816 } 4817 4818 /* Compute random challenge. */ 4819 ch = (uint32_t *)sp->hisauth.challenge; 4820 cprng_strong(kern_cprng, ch, clen, 0); 4821 4822 sp->scp[IDX_CHAP].confid = ++sp->scp[IDX_CHAP].seq; 4823 4824 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->scp[IDX_CHAP].confid, 4825 sizeof clen, (const char *)&clen, 4826 sizeof(sp->hisauth.challenge), sp->hisauth.challenge, 4827 0); 4828 } 4829 4830 /* 4831 *--------------------------------------------------------------------------* 4832 * * 4833 * The PAP implementation. * 4834 * * 4835 *--------------------------------------------------------------------------* 4836 */ 4837 /* 4838 * For PAP, we need to keep a little state also if we are the peer, not the 4839 * authenticator. This is since we don't get a request to authenticate, but 4840 * have to repeatedly authenticate ourself until we got a response (or the 4841 * retry counter is expired). 4842 */ 4843 4844 /* 4845 * Handle incoming PAP packets. */ 4846 static void 4847 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4848 { 4849 STDDCL; 4850 struct lcp_header *h; 4851 int len, x; 4852 u_char mlen; 4853 char *name, *secret; 4854 int name_len, secret_len; 4855 4856 /* 4857 * Malicious input might leave this uninitialized, so 4858 * init to an impossible value. 4859 */ 4860 secret_len = -1; 4861 4862 len = m->m_pkthdr.len; 4863 if (len < 5) { 4864 if (debug) 4865 log(LOG_DEBUG, 4866 "%s: pap invalid packet length: %d bytes\n", 4867 ifp->if_xname, len); 4868 return; 4869 } 4870 h = mtod(m, struct lcp_header *); 4871 if (len > ntohs(h->len)) 4872 len = ntohs(h->len); 4873 4874 SPPP_LOCK(sp, RW_WRITER); 4875 4876 switch (h->type) { 4877 /* PAP request is my authproto */ 4878 case PAP_REQ: 4879 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4880 /* can't do anything useful */ 4881 printf("%s: " 4882 "pap request without his name and his secret being set\n", 4883 ifp->if_xname); 4884 break; 4885 } 4886 name = 1 + (u_char *)(h + 1); 4887 name_len = name[-1]; 4888 secret = name + name_len + 1; 4889 if (name_len > len - 6 || 4890 (secret_len = secret[-1]) > len - 6 - name_len) { 4891 if (debug) { 4892 log(LOG_DEBUG, "%s: pap corrupted input " 4893 "<%s id=0x%x len=%d", 4894 ifp->if_xname, 4895 sppp_auth_type_name(PPP_PAP, h->type), 4896 h->ident, ntohs(h->len)); 4897 if (len > 4) 4898 sppp_print_bytes((u_char *)(h + 1), 4899 len - 4); 4900 addlog(">\n"); 4901 } 4902 break; 4903 } 4904 if (debug) { 4905 log(LOG_DEBUG, "%s: pap input(%s) " 4906 "<%s id=0x%x len=%d name=", 4907 ifp->if_xname, 4908 sppp_state_name(sp->scp[IDX_PAP].state), 4909 sppp_auth_type_name(PPP_PAP, h->type), 4910 h->ident, ntohs(h->len)); 4911 sppp_print_string((char *)name, name_len); 4912 addlog(" secret="); 4913 sppp_print_string((char *)secret, secret_len); 4914 addlog(">\n"); 4915 } 4916 if (name_len != sp->hisauth.name_len || 4917 secret_len != sp->hisauth.secret_len || 4918 memcmp(name, sp->hisauth.name, name_len) != 0 || 4919 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4920 /* action scn, tld */ 4921 sp->pp_auth_failures++; 4922 mlen = sizeof(FAILMSG) - 1; 4923 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4924 sizeof mlen, (const char *)&mlen, 4925 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4926 0); 4927 pap.tld(sp); 4928 break; 4929 } 4930 /* action sca, perhaps tlu */ 4931 if (sp->scp[IDX_PAP].state == STATE_REQ_SENT || 4932 sp->scp[IDX_PAP].state == STATE_OPENED) { 4933 mlen = sizeof(SUCCMSG) - 1; 4934 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4935 sizeof mlen, (const char *)&mlen, 4936 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4937 0); 4938 } 4939 if (sp->scp[IDX_PAP].state == STATE_REQ_SENT) { 4940 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4941 pap.tlu(sp); 4942 } 4943 break; 4944 4945 /* ack and nak are his authproto */ 4946 case PAP_ACK: 4947 callout_stop(&sp->pap_my_to_ch); 4948 if (debug) { 4949 log(LOG_DEBUG, "%s: pap success", 4950 ifp->if_xname); 4951 name = 1 + (u_char *)(h + 1); 4952 name_len = name[-1]; 4953 if (len > 5 && name_len < len+4) { 4954 addlog(": "); 4955 sppp_print_string(name, name_len); 4956 } 4957 addlog("\n"); 4958 } 4959 x = splnet(); 4960 sp->pp_auth_failures = 0; 4961 sp->pp_flags &= ~PP_NEEDAUTH; 4962 if (sp->myauth.proto == PPP_PAP && 4963 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4964 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4965 /* 4966 * We are authenticator for PAP but didn't 4967 * complete yet. Leave it to tlu to proceed 4968 * to network phase. 4969 */ 4970 splx(x); 4971 break; 4972 } 4973 splx(x); 4974 sppp_phase_network(sp); 4975 break; 4976 4977 case PAP_NAK: 4978 callout_stop(&sp->pap_my_to_ch); 4979 sp->pp_auth_failures++; 4980 if (debug) { 4981 log(LOG_INFO, "%s: pap failure", 4982 ifp->if_xname); 4983 name = 1 + (u_char *)(h + 1); 4984 name_len = name[-1]; 4985 if (len > 5 && name_len < len+4) { 4986 addlog(": "); 4987 sppp_print_string(name, name_len); 4988 } 4989 addlog("\n"); 4990 } else 4991 log(LOG_INFO, "%s: pap failure\n", 4992 ifp->if_xname); 4993 /* await LCP shutdown by authenticator */ 4994 break; 4995 4996 default: 4997 /* Unknown PAP packet type -- ignore. */ 4998 if (debug) { 4999 log(LOG_DEBUG, "%s: pap corrupted input " 5000 "<0x%x id=0x%x len=%d", 5001 ifp->if_xname, 5002 h->type, h->ident, ntohs(h->len)); 5003 if (len > 4) 5004 sppp_print_bytes((u_char *)(h + 1), len - 4); 5005 addlog(">\n"); 5006 } 5007 break; 5008 } 5009 5010 SPPP_UNLOCK(sp); 5011 } 5012 5013 static void 5014 sppp_pap_init(struct sppp *sp) 5015 { 5016 5017 KASSERT(SPPP_WLOCKED(sp)); 5018 5019 /* PAP doesn't have STATE_INITIAL at all. */ 5020 sp->scp[IDX_PAP].state = STATE_CLOSED; 5021 sp->scp[IDX_PAP].fail_counter = 0; 5022 sp->scp[IDX_PAP].seq = 0; 5023 sp->scp[IDX_PAP].rseq = 0; 5024 callout_init(&sp->scp[IDX_PAP].ch, CALLOUT_MPSAFE); 5025 callout_init(&sp->pap_my_to_ch, CALLOUT_MPSAFE); 5026 } 5027 5028 static void 5029 sppp_pap_open(struct sppp *sp) 5030 { 5031 5032 KASSERT(SPPP_WLOCKED(sp)); 5033 5034 if (sp->hisauth.proto == PPP_PAP && 5035 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 5036 /* we are authenticator for PAP, start our timer */ 5037 sp->scp[IDX_PAP].rst_counter = sp->lcp.max_configure; 5038 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 5039 } 5040 if (sp->myauth.proto == PPP_PAP) { 5041 /* we are peer, send a request, and start a timer */ 5042 pap.scr(sp); 5043 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 5044 sppp_pap_my_TO, sp); 5045 } 5046 } 5047 5048 static void 5049 sppp_pap_close(struct sppp *sp) 5050 { 5051 5052 KASSERT(SPPP_WLOCKED(sp)); 5053 5054 if (sp->scp[IDX_PAP].state != STATE_CLOSED) 5055 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 5056 } 5057 5058 /* 5059 * That's the timeout routine if we are authenticator. Since the 5060 * authenticator is basically passive in PAP, we can't do much here. 5061 */ 5062 static void 5063 sppp_pap_TO(void *cookie) 5064 { 5065 struct sppp *sp = (struct sppp *)cookie; 5066 STDDCL; 5067 int s; 5068 5069 s = splnet(); 5070 SPPP_LOCK(sp, RW_WRITER); 5071 5072 if (debug) 5073 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 5074 ifp->if_xname, 5075 sppp_state_name(sp->scp[IDX_PAP].state), 5076 sp->scp[IDX_PAP].rst_counter); 5077 5078 if (--sp->scp[IDX_PAP].rst_counter < 0) 5079 /* TO- event */ 5080 switch (sp->scp[IDX_PAP].state) { 5081 case STATE_REQ_SENT: 5082 pap.tld(sp); 5083 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 5084 break; 5085 } 5086 else 5087 /* TO+ event, not very much we could do */ 5088 switch (sp->scp[IDX_PAP].state) { 5089 case STATE_REQ_SENT: 5090 /* sppp_cp_change_state() will restart the timer */ 5091 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 5092 break; 5093 } 5094 5095 SPPP_UNLOCK(sp); 5096 splx(s); 5097 } 5098 5099 /* 5100 * That's the timeout handler if we are peer. Since the peer is active, 5101 * we need to retransmit our PAP request since it is apparently lost. 5102 * XXX We should impose a max counter. 5103 */ 5104 static void 5105 sppp_pap_my_TO(void *cookie) 5106 { 5107 struct sppp *sp = (struct sppp *)cookie; 5108 STDDCL; 5109 5110 SPPP_LOCK(sp, RW_WRITER); 5111 if (debug) 5112 log(LOG_DEBUG, "%s: pap peer TO\n", 5113 ifp->if_xname); 5114 5115 pap.scr(sp); 5116 5117 SPPP_UNLOCK(sp); 5118 } 5119 5120 static void 5121 sppp_pap_tlu(struct sppp *sp) 5122 { 5123 STDDCL; 5124 int x; 5125 5126 KASSERT(SPPP_WLOCKED(sp)); 5127 5128 sp->scp[IDX_PAP].rst_counter = sp->lcp.max_configure; 5129 5130 if (debug) 5131 log(LOG_DEBUG, "%s: %s tlu\n", 5132 ifp->if_xname, pap.name); 5133 5134 x = splnet(); 5135 sp->pp_auth_failures = 0; 5136 /* indicate to LCP that we need to be closed down */ 5137 sp->lcp.protos |= (1 << IDX_PAP); 5138 5139 if (sp->pp_flags & PP_NEEDAUTH) { 5140 /* 5141 * Remote is authenticator, but his auth proto didn't 5142 * complete yet. Defer the transition to network 5143 * phase. 5144 */ 5145 splx(x); 5146 return; 5147 } 5148 splx(x); 5149 sppp_phase_network(sp); 5150 } 5151 5152 static void 5153 sppp_pap_tld(struct sppp *sp) 5154 { 5155 STDDCL; 5156 5157 KASSERT(SPPP_WLOCKED(sp)); 5158 5159 if (debug) 5160 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 5161 callout_stop(&sp->scp[IDX_PAP].ch); 5162 callout_stop(&sp->pap_my_to_ch); 5163 sp->lcp.protos &= ~(1 << IDX_PAP); 5164 5165 lcp.Close(sp); 5166 } 5167 5168 static void 5169 sppp_pap_scr(struct sppp *sp) 5170 { 5171 u_char idlen, pwdlen; 5172 5173 KASSERT(SPPP_WLOCKED(sp)); 5174 5175 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 5176 /* can't do anything useful */ 5177 printf("%s: pap starting without my name and secret being set\n", 5178 sp->pp_if.if_xname); 5179 return; 5180 } 5181 5182 sp->scp[IDX_PAP].confid = ++sp->scp[IDX_PAP].seq; 5183 pwdlen = sp->myauth.secret_len; 5184 idlen = sp->myauth.name_len; 5185 5186 sppp_auth_send(&pap, sp, PAP_REQ, sp->scp[IDX_PAP].confid, 5187 sizeof idlen, (const char *)&idlen, 5188 idlen, sp->myauth.name, 5189 sizeof pwdlen, (const char *)&pwdlen, 5190 pwdlen, sp->myauth.secret, 5191 0); 5192 } 5193 5194 /* 5195 * Random miscellaneous functions. 5196 */ 5197 5198 /* 5199 * Send a PAP or CHAP proto packet. 5200 * 5201 * Varadic function, each of the elements for the ellipsis is of type 5202 * ``size_t mlen, const u_char *msg''. Processing will stop iff 5203 * mlen == 0. 5204 * NOTE: never declare variadic functions with types subject to type 5205 * promotion (i.e. u_char). This is asking for big trouble depending 5206 * on the architecture you are on... 5207 */ 5208 5209 static void 5210 sppp_auth_send(const struct cp *cp, struct sppp *sp, 5211 unsigned int type, unsigned int id, 5212 ...) 5213 { 5214 STDDCL; 5215 struct lcp_header *lh; 5216 struct mbuf *m; 5217 u_char *p; 5218 int len; 5219 size_t pkthdrlen; 5220 unsigned int mlen; 5221 const char *msg; 5222 va_list ap; 5223 5224 KASSERT(SPPP_WLOCKED(sp)); 5225 5226 MGETHDR(m, M_DONTWAIT, MT_DATA); 5227 if (! m) 5228 return; 5229 m_reset_rcvif(m); 5230 5231 if (sp->pp_flags & PP_NOFRAMING) { 5232 *mtod(m, uint16_t *) = htons(cp->proto); 5233 pkthdrlen = 2; 5234 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 5235 } else { 5236 struct ppp_header *h; 5237 h = mtod(m, struct ppp_header *); 5238 h->address = PPP_ALLSTATIONS; /* broadcast address */ 5239 h->control = PPP_UI; /* Unnumbered Info */ 5240 h->protocol = htons(cp->proto); 5241 pkthdrlen = PPP_HEADER_LEN; 5242 5243 lh = (struct lcp_header *)(h + 1); 5244 } 5245 5246 lh->type = type; 5247 lh->ident = id; 5248 p = (u_char *)(lh + 1); 5249 5250 va_start(ap, id); 5251 len = 0; 5252 5253 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 5254 msg = va_arg(ap, const char *); 5255 len += mlen; 5256 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 5257 va_end(ap); 5258 m_freem(m); 5259 return; 5260 } 5261 5262 memcpy(p, msg, mlen); 5263 p += mlen; 5264 } 5265 va_end(ap); 5266 5267 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 5268 lh->len = htons(LCP_HEADER_LEN + len); 5269 5270 if (debug) { 5271 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 5272 ifp->if_xname, cp->name, 5273 sppp_auth_type_name(cp->proto, lh->type), 5274 lh->ident, ntohs(lh->len)); 5275 if (len) 5276 sppp_print_bytes((u_char *)(lh + 1), len); 5277 addlog(">\n"); 5278 } 5279 if (IF_QFULL(&sp->pp_cpq)) { 5280 IF_DROP(&sp->pp_fastq); 5281 IF_DROP(&ifp->if_snd); 5282 m_freem(m); 5283 if_statinc(ifp, if_oerrors); 5284 return; 5285 } 5286 5287 if_statadd(ifp, if_obytes, m->m_pkthdr.len + sp->pp_framebytes); 5288 IF_ENQUEUE(&sp->pp_cpq, m); 5289 5290 if (! (ifp->if_flags & IFF_OACTIVE)) { 5291 SPPP_UNLOCK(sp); 5292 if_start_lock(ifp); 5293 SPPP_LOCK(sp, RW_WRITER); 5294 } 5295 } 5296 5297 /* 5298 * Send keepalive packets, every 10 seconds. 5299 */ 5300 static void 5301 sppp_keepalive(void *dummy) 5302 { 5303 struct sppp *sp; 5304 int s; 5305 time_t now; 5306 5307 SPPPQ_LOCK(); 5308 5309 s = splnet(); 5310 now = time_uptime; 5311 for (sp=spppq; sp; sp=sp->pp_next) { 5312 struct ifnet *ifp = NULL; 5313 5314 SPPP_LOCK(sp, RW_WRITER); 5315 ifp = &sp->pp_if; 5316 5317 /* check idle timeout */ 5318 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 5319 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 5320 /* idle timeout is enabled for this interface */ 5321 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 5322 if (ifp->if_flags & IFF_DEBUG) 5323 printf("%s: no activity for %lu seconds\n", 5324 sp->pp_if.if_xname, 5325 (unsigned long)(now-sp->pp_last_activity)); 5326 lcp.Close(sp); 5327 SPPP_UNLOCK(sp); 5328 continue; 5329 } 5330 } 5331 5332 /* Keepalive mode disabled or channel down? */ 5333 if (! (sp->pp_flags & PP_KEEPALIVE) || 5334 ! (ifp->if_flags & IFF_RUNNING)) { 5335 SPPP_UNLOCK(sp); 5336 continue; 5337 } 5338 5339 5340 /* No keepalive in PPP mode if LCP not opened yet. */ 5341 if (! (sp->pp_flags & PP_CISCO) && 5342 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) { 5343 SPPP_UNLOCK(sp); 5344 continue; 5345 } 5346 5347 /* No echo reply, but maybe user data passed through? */ 5348 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 5349 sp->pp_alivecnt = 0; 5350 SPPP_UNLOCK(sp); 5351 continue; 5352 } 5353 5354 if (sp->pp_alivecnt >= sp->pp_maxalive) { 5355 /* No keepalive packets got. Stop the interface. */ 5356 SPPP_UNLOCK(sp); 5357 if_down (ifp); 5358 SPPP_LOCK(sp, RW_WRITER); 5359 5360 IF_PURGE(&sp->pp_cpq); 5361 5362 if (! (sp->pp_flags & PP_CISCO)) { 5363 printf("%s: LCP keepalive timed out, going to restart the connection\n", 5364 ifp->if_xname); 5365 sp->pp_alivecnt = 0; 5366 5367 /* we are down, close all open protocols */ 5368 lcp.Close(sp); 5369 5370 /* And now prepare LCP to reestablish the link, if configured to do so. */ 5371 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 5372 5373 /* Close connection immediately, completition of this 5374 * will summon the magic needed to reestablish it. */ 5375 sppp_notify_tlf_wlocked(sp); 5376 5377 SPPP_UNLOCK(sp); 5378 continue; 5379 } 5380 } 5381 if (sp->pp_alivecnt < sp->pp_maxalive) 5382 ++sp->pp_alivecnt; 5383 if (sp->pp_flags & PP_CISCO) 5384 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 5385 ++sp->scp[IDX_LCP].seq, sp->scp[IDX_LCP].rseq); 5386 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 5387 int32_t nmagic = htonl(sp->lcp.magic); 5388 sp->lcp.echoid = ++sp->scp[IDX_LCP].seq; 5389 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 5390 sp->lcp.echoid, 4, &nmagic); 5391 } 5392 5393 SPPP_UNLOCK(sp); 5394 } 5395 splx(s); 5396 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 5397 5398 SPPPQ_UNLOCK(); 5399 } 5400 5401 #ifdef INET 5402 /* 5403 * Get both IP addresses. 5404 */ 5405 static void 5406 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 5407 { 5408 struct ifnet *ifp = &sp->pp_if; 5409 struct ifaddr *ifa; 5410 struct sockaddr_in *si, *sm; 5411 uint32_t ssrc, ddst; 5412 int s; 5413 struct psref psref; 5414 5415 sm = NULL; 5416 ssrc = ddst = 0; 5417 /* 5418 * Pick the first AF_INET address from the list, 5419 * aliases don't make any sense on a p2p link anyway. 5420 */ 5421 si = 0; 5422 s = pserialize_read_enter(); 5423 IFADDR_READER_FOREACH(ifa, ifp) { 5424 if (ifa->ifa_addr->sa_family == AF_INET) { 5425 si = (struct sockaddr_in *)ifa->ifa_addr; 5426 sm = (struct sockaddr_in *)ifa->ifa_netmask; 5427 if (si) { 5428 ifa_acquire(ifa, &psref); 5429 break; 5430 } 5431 } 5432 } 5433 pserialize_read_exit(s); 5434 if (ifa) { 5435 if (si && si->sin_addr.s_addr) { 5436 ssrc = si->sin_addr.s_addr; 5437 if (srcmask) 5438 *srcmask = ntohl(sm->sin_addr.s_addr); 5439 } 5440 5441 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 5442 if (si && si->sin_addr.s_addr) 5443 ddst = si->sin_addr.s_addr; 5444 ifa_release(ifa, &psref); 5445 } 5446 5447 if (dst) *dst = ntohl(ddst); 5448 if (src) *src = ntohl(ssrc); 5449 } 5450 5451 /* 5452 * Set IP addresses. Must be called at splnet. 5453 * If an address is 0, leave it the way it is. 5454 */ 5455 static void 5456 sppp_set_ip_addrs_work(struct work *wk, struct sppp *sp) 5457 { 5458 STDDCL; 5459 struct ifaddr *ifa; 5460 struct sockaddr_in *si, *dest; 5461 uint32_t myaddr = 0, hisaddr = 0; 5462 int s; 5463 5464 IFNET_LOCK(ifp); 5465 5466 /* 5467 * Pick the first AF_INET address from the list, 5468 * aliases don't make any sense on a p2p link anyway. 5469 */ 5470 si = dest = NULL; 5471 s = pserialize_read_enter(); 5472 IFADDR_READER_FOREACH(ifa, ifp) { 5473 if (ifa->ifa_addr->sa_family == AF_INET) { 5474 si = (struct sockaddr_in *)ifa->ifa_addr; 5475 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5476 break; 5477 } 5478 } 5479 pserialize_read_exit(s); 5480 5481 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 5482 myaddr = sp->ipcp.req_myaddr; 5483 else if (si != NULL) 5484 myaddr = ntohl(si->sin_addr.s_addr); 5485 5486 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 5487 hisaddr = sp->ipcp.req_hisaddr; 5488 else if (dest != NULL) 5489 hisaddr = ntohl(dest->sin_addr.s_addr); 5490 5491 if (si != NULL && dest != NULL) { 5492 int error; 5493 struct sockaddr_in new_sin = *si; 5494 struct sockaddr_in new_dst = *dest; 5495 5496 if (myaddr != 0) 5497 new_sin.sin_addr.s_addr = htonl(myaddr); 5498 if (hisaddr != 0) { 5499 new_dst.sin_addr.s_addr = htonl(hisaddr); 5500 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) 5501 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 5502 } 5503 5504 in_addrhash_remove(ifatoia(ifa)); 5505 5506 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5507 5508 in_addrhash_insert(ifatoia(ifa)); 5509 5510 if (debug && error) 5511 { 5512 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 5513 ifp->if_xname, __func__, error); 5514 } 5515 if (!error) { 5516 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5517 } 5518 } 5519 5520 if (ifp->if_mtu > sp->lcp.their_mru) { 5521 sp->pp_saved_mtu = ifp->if_mtu; 5522 ifp->if_mtu = sp->lcp.their_mru; 5523 if (debug) 5524 log(LOG_DEBUG, 5525 "%s: setting MTU to %" PRIu64 " bytes\n", 5526 ifp->if_xname, ifp->if_mtu); 5527 } 5528 5529 IFNET_UNLOCK(ifp); 5530 5531 sppp_notify_con(sp); 5532 } 5533 5534 static void 5535 sppp_set_ip_addrs(struct sppp *sp) 5536 { 5537 struct ifnet *ifp = &sp->pp_if; 5538 5539 if (!pcq_put(sp->ipcp.update_addrs_q, (void *)IPCP_SET_ADDRS)) { 5540 log(LOG_WARNING, "%s: cannot enqueued, ignore sppp_clear_ip_addrs\n", 5541 ifp->if_xname); 5542 return; 5543 } 5544 5545 if (atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1) == 1) 5546 return; 5547 5548 workqueue_enqueue(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk, NULL); 5549 } 5550 5551 /* 5552 * Clear IP addresses. Must be called at splnet. 5553 */ 5554 static void 5555 sppp_clear_ip_addrs_work(struct work *wk, struct sppp *sp) 5556 { 5557 STDDCL; 5558 struct ifaddr *ifa; 5559 struct sockaddr_in *si, *dest; 5560 int s; 5561 5562 IFNET_LOCK(ifp); 5563 5564 /* 5565 * Pick the first AF_INET address from the list, 5566 * aliases don't make any sense on a p2p link anyway. 5567 */ 5568 si = dest = NULL; 5569 s = pserialize_read_enter(); 5570 IFADDR_READER_FOREACH(ifa, ifp) { 5571 if (ifa->ifa_addr->sa_family == AF_INET) { 5572 si = (struct sockaddr_in *)ifa->ifa_addr; 5573 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 5574 break; 5575 } 5576 } 5577 pserialize_read_exit(s); 5578 5579 if (si != NULL) { 5580 struct sockaddr_in new_sin = *si; 5581 struct sockaddr_in new_dst = *dest; 5582 int error; 5583 5584 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 5585 new_sin.sin_addr.s_addr = 0; 5586 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 5587 new_dst.sin_addr.s_addr = sp->ipcp.saved_hisaddr; 5588 5589 in_addrhash_remove(ifatoia(ifa)); 5590 5591 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 5592 5593 in_addrhash_insert(ifatoia(ifa)); 5594 5595 if (debug && error) 5596 { 5597 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 5598 ifp->if_xname, __func__, error); 5599 } 5600 if (!error) { 5601 pfil_run_addrhooks(if_pfil, SIOCAIFADDR, ifa); 5602 } 5603 } 5604 5605 if (sp->pp_saved_mtu > 0) { 5606 ifp->if_mtu = sp->pp_saved_mtu; 5607 sp->pp_saved_mtu = 0; 5608 if (debug) 5609 log(LOG_DEBUG, 5610 "%s: resetting MTU to %" PRIu64 " bytes\n", 5611 ifp->if_xname, ifp->if_mtu); 5612 } 5613 5614 IFNET_UNLOCK(ifp); 5615 } 5616 5617 static void 5618 sppp_clear_ip_addrs(struct sppp *sp) 5619 { 5620 struct ifnet *ifp = &sp->pp_if; 5621 5622 if (!pcq_put(sp->ipcp.update_addrs_q, (void *)IPCP_CLEAR_ADDRS)) { 5623 log(LOG_WARNING, "%s: cannot enqueued, ignore sppp_clear_ip_addrs\n", 5624 ifp->if_xname); 5625 return; 5626 } 5627 5628 if (atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 1) == 1) 5629 return; 5630 5631 workqueue_enqueue(sp->ipcp.update_addrs_wq, &sp->ipcp.update_addrs_wk, NULL); 5632 } 5633 5634 static void 5635 sppp_update_ip_addrs_work(struct work *wk, void *arg) 5636 { 5637 struct sppp *sp = arg; 5638 void *work; 5639 5640 atomic_swap_uint(&sp->ipcp.update_addrs_enqueued, 0); 5641 5642 while ((work = pcq_get(sp->ipcp.update_addrs_q)) != NULL) { 5643 int update = (intptr_t)work; 5644 5645 if (update == IPCP_SET_ADDRS) 5646 sppp_set_ip_addrs_work(wk, sp); 5647 else if (update == IPCP_CLEAR_ADDRS) 5648 sppp_clear_ip_addrs_work(wk, sp); 5649 } 5650 } 5651 #endif 5652 5653 #ifdef INET6 5654 /* 5655 * Get both IPv6 addresses. 5656 */ 5657 static void 5658 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5659 struct in6_addr *srcmask) 5660 { 5661 struct ifnet *ifp = &sp->pp_if; 5662 struct ifaddr *ifa; 5663 struct sockaddr_in6 *si, *sm; 5664 struct in6_addr ssrc, ddst; 5665 int s; 5666 struct psref psref; 5667 5668 sm = NULL; 5669 memset(&ssrc, 0, sizeof(ssrc)); 5670 memset(&ddst, 0, sizeof(ddst)); 5671 /* 5672 * Pick the first link-local AF_INET6 address from the list, 5673 * aliases don't make any sense on a p2p link anyway. 5674 */ 5675 si = 0; 5676 s = pserialize_read_enter(); 5677 IFADDR_READER_FOREACH(ifa, ifp) { 5678 if (ifa->ifa_addr->sa_family == AF_INET6) { 5679 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5680 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5681 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) { 5682 ifa_acquire(ifa, &psref); 5683 break; 5684 } 5685 } 5686 } 5687 pserialize_read_exit(s); 5688 5689 if (ifa) { 5690 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5691 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5692 if (srcmask) { 5693 memcpy(srcmask, &sm->sin6_addr, 5694 sizeof(*srcmask)); 5695 } 5696 } 5697 5698 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5699 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5700 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5701 ifa_release(ifa, &psref); 5702 } 5703 5704 if (dst) 5705 memcpy(dst, &ddst, sizeof(*dst)); 5706 if (src) 5707 memcpy(src, &ssrc, sizeof(*src)); 5708 } 5709 5710 #ifdef IPV6CP_MYIFID_DYN 5711 /* 5712 * Generate random ifid. 5713 */ 5714 static void 5715 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5716 { 5717 /* TBD */ 5718 } 5719 5720 /* 5721 * Set my IPv6 address. Must be called at splnet. 5722 */ 5723 static void 5724 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5725 { 5726 STDDCL; 5727 struct ifaddr *ifa; 5728 struct sockaddr_in6 *sin6; 5729 int s; 5730 struct psref psref; 5731 5732 IFNET_LOCK(ifp); 5733 5734 /* 5735 * Pick the first link-local AF_INET6 address from the list, 5736 * aliases don't make any sense on a p2p link anyway. 5737 */ 5738 5739 sin6 = NULL; 5740 s = pserialize_read_enter(); 5741 IFADDR_READER_FOREACH(ifa, ifp) 5742 { 5743 if (ifa->ifa_addr->sa_family == AF_INET6) 5744 { 5745 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5746 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 5747 ifa_acquire(ifa, &psref); 5748 break; 5749 } 5750 } 5751 } 5752 pserialize_read_exit(s); 5753 5754 if (ifa && sin6) 5755 { 5756 int error; 5757 struct sockaddr_in6 new_sin6 = *sin6; 5758 5759 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5760 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5761 if (debug && error) 5762 { 5763 log(LOG_DEBUG, "%s: %s: in6_ifinit failed, error=%d\n", 5764 ifp->if_xname, __func__, error); 5765 } 5766 if (!error) { 5767 pfil_run_addrhooks(if_pfil, SIOCAIFADDR_IN6, ifa); 5768 } 5769 ifa_release(ifa, &psref); 5770 } 5771 5772 IFNET_UNLOCK(ifp); 5773 } 5774 #endif 5775 5776 /* 5777 * Suggest a candidate address to be used by peer. 5778 */ 5779 static void 5780 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5781 { 5782 struct in6_addr myaddr; 5783 struct timeval tv; 5784 5785 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5786 5787 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5788 microtime(&tv); 5789 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5790 myaddr.s6_addr[14] ^= 0xff; 5791 myaddr.s6_addr[15] ^= 0xff; 5792 } else { 5793 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5794 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5795 } 5796 if (suggest) 5797 memcpy(suggest, &myaddr, sizeof(myaddr)); 5798 } 5799 #endif /*INET6*/ 5800 5801 /* 5802 * Process ioctl requests specific to the PPP interface. 5803 * Permissions have already been checked. 5804 */ 5805 static int 5806 sppp_params(struct sppp *sp, u_long cmd, void *data) 5807 { 5808 switch (cmd) { 5809 case SPPPGETAUTHCFG: 5810 { 5811 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5812 int error; 5813 size_t len; 5814 5815 SPPP_LOCK(sp, RW_READER); 5816 5817 cfg->myauthflags = sp->myauth.flags; 5818 cfg->hisauthflags = sp->hisauth.flags; 5819 strlcpy(cfg->ifname, sp->pp_if.if_xname, sizeof(cfg->ifname)); 5820 cfg->hisauth = 0; 5821 if (sp->hisauth.proto) 5822 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5823 cfg->myauth = 0; 5824 if (sp->myauth.proto) 5825 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5826 if (cfg->myname_length == 0) { 5827 if (sp->myauth.name != NULL) 5828 cfg->myname_length = sp->myauth.name_len + 1; 5829 } else { 5830 if (sp->myauth.name == NULL) { 5831 cfg->myname_length = 0; 5832 } else { 5833 len = sp->myauth.name_len + 1; 5834 5835 5836 if (cfg->myname_length < len) { 5837 SPPP_UNLOCK(sp); 5838 return (ENAMETOOLONG); 5839 } 5840 error = copyout(sp->myauth.name, cfg->myname, len); 5841 if (error) { 5842 SPPP_UNLOCK(sp); 5843 return error; 5844 } 5845 } 5846 } 5847 if (cfg->hisname_length == 0) { 5848 if (sp->hisauth.name != NULL) 5849 cfg->hisname_length = sp->hisauth.name_len + 1; 5850 } else { 5851 if (sp->hisauth.name == NULL) { 5852 cfg->hisname_length = 0; 5853 } else { 5854 len = sp->hisauth.name_len + 1; 5855 5856 if (cfg->hisname_length < len) { 5857 SPPP_UNLOCK(sp); 5858 return (ENAMETOOLONG); 5859 } 5860 error = copyout(sp->hisauth.name, cfg->hisname, len); 5861 if (error) { 5862 SPPP_UNLOCK(sp); 5863 return error; 5864 } 5865 } 5866 } 5867 SPPP_UNLOCK(sp); 5868 } 5869 break; 5870 case SPPPSETAUTHCFG: 5871 { 5872 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5873 int error; 5874 5875 SPPP_LOCK(sp, RW_WRITER); 5876 5877 if (sp->myauth.name) { 5878 free(sp->myauth.name, M_DEVBUF); 5879 sp->myauth.name = NULL; 5880 } 5881 if (sp->myauth.secret) { 5882 free(sp->myauth.secret, M_DEVBUF); 5883 sp->myauth.secret = NULL; 5884 } 5885 if (sp->hisauth.name) { 5886 free(sp->hisauth.name, M_DEVBUF); 5887 sp->hisauth.name = NULL; 5888 } 5889 if (sp->hisauth.secret) { 5890 free(sp->hisauth.secret, M_DEVBUF); 5891 sp->hisauth.secret = NULL; 5892 } 5893 5894 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5895 if (cfg->hisname_length >= MCLBYTES) { 5896 SPPP_UNLOCK(sp); 5897 return (ENAMETOOLONG); 5898 } 5899 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5900 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5901 if (error) { 5902 free(sp->hisauth.name, M_DEVBUF); 5903 sp->hisauth.name = NULL; 5904 SPPP_UNLOCK(sp); 5905 return error; 5906 } 5907 sp->hisauth.name_len = cfg->hisname_length - 1; 5908 sp->hisauth.name[sp->hisauth.name_len] = 0; 5909 } 5910 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5911 if (cfg->hissecret_length >= MCLBYTES) { 5912 SPPP_UNLOCK(sp); 5913 return (ENAMETOOLONG); 5914 } 5915 sp->hisauth.secret = malloc(cfg->hissecret_length, 5916 M_DEVBUF, M_WAITOK); 5917 error = copyin(cfg->hissecret, sp->hisauth.secret, 5918 cfg->hissecret_length); 5919 if (error) { 5920 free(sp->hisauth.secret, M_DEVBUF); 5921 sp->hisauth.secret = NULL; 5922 SPPP_UNLOCK(sp); 5923 return error; 5924 } 5925 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5926 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5927 } 5928 if (cfg->myname != NULL && cfg->myname_length > 0) { 5929 if (cfg->myname_length >= MCLBYTES) { 5930 SPPP_UNLOCK(sp); 5931 return (ENAMETOOLONG); 5932 } 5933 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5934 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5935 if (error) { 5936 free(sp->myauth.name, M_DEVBUF); 5937 sp->myauth.name = NULL; 5938 SPPP_UNLOCK(sp); 5939 return error; 5940 } 5941 sp->myauth.name_len = cfg->myname_length - 1; 5942 sp->myauth.name[sp->myauth.name_len] = 0; 5943 } 5944 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5945 if (cfg->mysecret_length >= MCLBYTES) { 5946 SPPP_UNLOCK(sp); 5947 return (ENAMETOOLONG); 5948 } 5949 sp->myauth.secret = malloc(cfg->mysecret_length, 5950 M_DEVBUF, M_WAITOK); 5951 error = copyin(cfg->mysecret, sp->myauth.secret, 5952 cfg->mysecret_length); 5953 if (error) { 5954 free(sp->myauth.secret, M_DEVBUF); 5955 sp->myauth.secret = NULL; 5956 SPPP_UNLOCK(sp); 5957 return error; 5958 } 5959 sp->myauth.secret_len = cfg->mysecret_length - 1; 5960 sp->myauth.secret[sp->myauth.secret_len] = 0; 5961 } 5962 sp->myauth.flags = cfg->myauthflags; 5963 if (cfg->myauth) 5964 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5965 sp->hisauth.flags = cfg->hisauthflags; 5966 if (cfg->hisauth) 5967 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5968 sp->pp_auth_failures = 0; 5969 if (sp->hisauth.proto != 0) 5970 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5971 else 5972 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5973 5974 SPPP_UNLOCK(sp); 5975 } 5976 break; 5977 case SPPPGETLCPCFG: 5978 { 5979 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5980 5981 SPPP_LOCK(sp, RW_READER); 5982 lcpp->lcp_timeout = sp->lcp.timeout; 5983 SPPP_UNLOCK(sp); 5984 } 5985 break; 5986 case SPPPSETLCPCFG: 5987 { 5988 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5989 5990 SPPP_LOCK(sp, RW_WRITER); 5991 sp->lcp.timeout = lcpp->lcp_timeout; 5992 SPPP_UNLOCK(sp); 5993 } 5994 break; 5995 case SPPPGETSTATUS: 5996 { 5997 struct spppstatus *status = (struct spppstatus *)data; 5998 5999 SPPP_LOCK(sp, RW_READER); 6000 status->phase = sp->pp_phase; 6001 SPPP_UNLOCK(sp); 6002 } 6003 break; 6004 case SPPPGETSTATUSNCP: 6005 { 6006 struct spppstatusncp *status = (struct spppstatusncp *)data; 6007 6008 SPPP_LOCK(sp, RW_READER); 6009 status->phase = sp->pp_phase; 6010 status->ncpup = sppp_ncp_check(sp); 6011 SPPP_UNLOCK(sp); 6012 } 6013 break; 6014 case SPPPGETIDLETO: 6015 { 6016 struct spppidletimeout *to = (struct spppidletimeout *)data; 6017 6018 SPPP_LOCK(sp, RW_READER); 6019 to->idle_seconds = sp->pp_idle_timeout; 6020 SPPP_UNLOCK(sp); 6021 } 6022 break; 6023 case SPPPSETIDLETO: 6024 { 6025 struct spppidletimeout *to = (struct spppidletimeout *)data; 6026 6027 SPPP_LOCK(sp, RW_WRITER); 6028 sp->pp_idle_timeout = to->idle_seconds; 6029 SPPP_UNLOCK(sp); 6030 } 6031 break; 6032 case SPPPSETAUTHFAILURE: 6033 { 6034 struct spppauthfailuresettings *afsettings = 6035 (struct spppauthfailuresettings *)data; 6036 6037 SPPP_LOCK(sp, RW_WRITER); 6038 sp->pp_max_auth_fail = afsettings->max_failures; 6039 sp->pp_auth_failures = 0; 6040 SPPP_UNLOCK(sp); 6041 } 6042 break; 6043 case SPPPGETAUTHFAILURES: 6044 { 6045 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 6046 6047 SPPP_LOCK(sp, RW_READER); 6048 stats->auth_failures = sp->pp_auth_failures; 6049 stats->max_failures = sp->pp_max_auth_fail; 6050 SPPP_UNLOCK(sp); 6051 } 6052 break; 6053 case SPPPSETDNSOPTS: 6054 { 6055 struct spppdnssettings *req = (struct spppdnssettings *)data; 6056 6057 SPPP_LOCK(sp, RW_WRITER); 6058 sp->query_dns = req->query_dns & 3; 6059 SPPP_UNLOCK(sp); 6060 } 6061 break; 6062 case SPPPGETDNSOPTS: 6063 { 6064 struct spppdnssettings *req = (struct spppdnssettings *)data; 6065 6066 SPPP_LOCK(sp, RW_READER); 6067 req->query_dns = sp->query_dns; 6068 SPPP_UNLOCK(sp); 6069 } 6070 break; 6071 case SPPPGETDNSADDRS: 6072 { 6073 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 6074 6075 SPPP_LOCK(sp, RW_READER); 6076 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 6077 SPPP_UNLOCK(sp); 6078 } 6079 break; 6080 case SPPPGETKEEPALIVE: 6081 { 6082 struct spppkeepalivesettings *settings = 6083 (struct spppkeepalivesettings*)data; 6084 6085 SPPP_LOCK(sp, RW_READER); 6086 settings->maxalive = sp->pp_maxalive; 6087 settings->max_noreceive = sp->pp_max_noreceive; 6088 SPPP_UNLOCK(sp); 6089 } 6090 break; 6091 case SPPPSETKEEPALIVE: 6092 { 6093 struct spppkeepalivesettings *settings = 6094 (struct spppkeepalivesettings*)data; 6095 6096 SPPP_LOCK(sp, RW_WRITER); 6097 sp->pp_maxalive = settings->maxalive; 6098 sp->pp_max_noreceive = settings->max_noreceive; 6099 SPPP_UNLOCK(sp); 6100 } 6101 break; 6102 default: 6103 { 6104 int ret; 6105 6106 MODULE_HOOK_CALL(sppp_params_50_hook, (sp, cmd, data), 6107 enosys(), ret); 6108 if (ret != ENOSYS) 6109 return ret; 6110 return (EINVAL); 6111 } 6112 } 6113 return (0); 6114 } 6115 6116 static void 6117 sppp_phase_network(struct sppp *sp) 6118 { 6119 int i; 6120 uint32_t mask; 6121 6122 KASSERT(SPPP_WLOCKED(sp)); 6123 6124 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 6125 6126 /* Notify NCPs now. */ 6127 for (i = 0; i < IDX_COUNT; i++) 6128 if ((cps[i])->flags & CP_NCP) 6129 (cps[i])->Open(sp); 6130 6131 /* Send Up events to all NCPs. */ 6132 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 6133 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) { 6134 (cps[i])->Up(sp); 6135 } 6136 6137 /* if no NCP is starting, all this was in vain, close down */ 6138 sppp_lcp_check_and_close(sp); 6139 } 6140 6141 6142 static const char * 6143 sppp_cp_type_name(u_char type) 6144 { 6145 static char buf[12]; 6146 switch (type) { 6147 case CONF_REQ: return "conf-req"; 6148 case CONF_ACK: return "conf-ack"; 6149 case CONF_NAK: return "conf-nak"; 6150 case CONF_REJ: return "conf-rej"; 6151 case TERM_REQ: return "term-req"; 6152 case TERM_ACK: return "term-ack"; 6153 case CODE_REJ: return "code-rej"; 6154 case PROTO_REJ: return "proto-rej"; 6155 case ECHO_REQ: return "echo-req"; 6156 case ECHO_REPLY: return "echo-reply"; 6157 case DISC_REQ: return "discard-req"; 6158 } 6159 snprintf(buf, sizeof(buf), "0x%x", type); 6160 return buf; 6161 } 6162 6163 static const char * 6164 sppp_auth_type_name(u_short proto, u_char type) 6165 { 6166 static char buf[32]; 6167 const char *name; 6168 6169 switch (proto) { 6170 case PPP_CHAP: 6171 switch (type) { 6172 case CHAP_CHALLENGE: return "challenge"; 6173 case CHAP_RESPONSE: return "response"; 6174 case CHAP_SUCCESS: return "success"; 6175 case CHAP_FAILURE: return "failure"; 6176 default: name = "chap"; break; 6177 } 6178 break; 6179 6180 case PPP_PAP: 6181 switch (type) { 6182 case PAP_REQ: return "req"; 6183 case PAP_ACK: return "ack"; 6184 case PAP_NAK: return "nak"; 6185 default: name = "pap"; break; 6186 } 6187 break; 6188 6189 default: 6190 name = "bad"; 6191 break; 6192 } 6193 6194 snprintf(buf, sizeof(buf), "%s(%#x) %#x", name, proto, type); 6195 return buf; 6196 } 6197 6198 static const char * 6199 sppp_lcp_opt_name(u_char opt) 6200 { 6201 static char buf[12]; 6202 switch (opt) { 6203 case LCP_OPT_MRU: return "mru"; 6204 case LCP_OPT_ASYNC_MAP: return "async-map"; 6205 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 6206 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 6207 case LCP_OPT_MAGIC: return "magic"; 6208 case LCP_OPT_PROTO_COMP: return "proto-comp"; 6209 case LCP_OPT_ADDR_COMP: return "addr-comp"; 6210 case LCP_OPT_SELF_DESC_PAD: return "sdpad"; 6211 case LCP_OPT_CALL_BACK: return "callback"; 6212 case LCP_OPT_COMPOUND_FRMS: return "cmpd-frms"; 6213 case LCP_OPT_MP_MRRU: return "mrru"; 6214 case LCP_OPT_MP_SSNHF: return "mp-ssnhf"; 6215 case LCP_OPT_MP_EID: return "mp-eid"; 6216 } 6217 snprintf(buf, sizeof(buf), "0x%x", opt); 6218 return buf; 6219 } 6220 6221 static const char * 6222 sppp_ipcp_opt_name(u_char opt) 6223 { 6224 static char buf[12]; 6225 switch (opt) { 6226 case IPCP_OPT_ADDRESSES: return "addresses"; 6227 case IPCP_OPT_COMPRESSION: return "compression"; 6228 case IPCP_OPT_ADDRESS: return "address"; 6229 } 6230 snprintf(buf, sizeof(buf), "0x%x", opt); 6231 return buf; 6232 } 6233 6234 #ifdef INET6 6235 static const char * 6236 sppp_ipv6cp_opt_name(u_char opt) 6237 { 6238 static char buf[12]; 6239 switch (opt) { 6240 case IPV6CP_OPT_IFID: return "ifid"; 6241 case IPV6CP_OPT_COMPRESSION: return "compression"; 6242 } 6243 snprintf(buf, sizeof(buf), "0x%x", opt); 6244 return buf; 6245 } 6246 #endif 6247 6248 static const char * 6249 sppp_state_name(int state) 6250 { 6251 switch (state) { 6252 case STATE_INITIAL: return "initial"; 6253 case STATE_STARTING: return "starting"; 6254 case STATE_CLOSED: return "closed"; 6255 case STATE_STOPPED: return "stopped"; 6256 case STATE_CLOSING: return "closing"; 6257 case STATE_STOPPING: return "stopping"; 6258 case STATE_REQ_SENT: return "req-sent"; 6259 case STATE_ACK_RCVD: return "ack-rcvd"; 6260 case STATE_ACK_SENT: return "ack-sent"; 6261 case STATE_OPENED: return "opened"; 6262 } 6263 return "illegal"; 6264 } 6265 6266 static const char * 6267 sppp_phase_name(int phase) 6268 { 6269 switch (phase) { 6270 case SPPP_PHASE_DEAD: return "dead"; 6271 case SPPP_PHASE_ESTABLISH: return "establish"; 6272 case SPPP_PHASE_TERMINATE: return "terminate"; 6273 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 6274 case SPPP_PHASE_NETWORK: return "network"; 6275 } 6276 return "illegal"; 6277 } 6278 6279 static const char * 6280 sppp_proto_name(u_short proto) 6281 { 6282 static char buf[12]; 6283 switch (proto) { 6284 case PPP_LCP: return "lcp"; 6285 case PPP_IPCP: return "ipcp"; 6286 case PPP_PAP: return "pap"; 6287 case PPP_CHAP: return "chap"; 6288 case PPP_IPV6CP: return "ipv6cp"; 6289 } 6290 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 6291 return buf; 6292 } 6293 6294 static void 6295 sppp_print_bytes(const u_char *p, u_short len) 6296 { 6297 addlog(" %02x", *p++); 6298 while (--len > 0) 6299 addlog("-%02x", *p++); 6300 } 6301 6302 static void 6303 sppp_print_string(const char *p, u_short len) 6304 { 6305 u_char c; 6306 6307 while (len-- > 0) { 6308 c = *p++; 6309 /* 6310 * Print only ASCII chars directly. RFC 1994 recommends 6311 * using only them, but we don't rely on it. */ 6312 if (c < ' ' || c > '~') 6313 addlog("\\x%x", c); 6314 else 6315 addlog("%c", c); 6316 } 6317 } 6318 6319 static const char * 6320 sppp_dotted_quad(uint32_t addr) 6321 { 6322 static char s[16]; 6323 snprintf(s, sizeof(s), "%d.%d.%d.%d", 6324 (int)((addr >> 24) & 0xff), 6325 (int)((addr >> 16) & 0xff), 6326 (int)((addr >> 8) & 0xff), 6327 (int)(addr & 0xff)); 6328 return s; 6329 } 6330 6331 /* a dummy, used to drop uninteresting events */ 6332 static void 6333 sppp_null(struct sppp *unused) 6334 { 6335 /* do just nothing */ 6336 } 6337 6338 static void 6339 sppp_sca_scn(const struct cp *cp, struct sppp *sp) 6340 { 6341 STDDCL; 6342 u_char rconfid, type, rlen; 6343 void *buf; 6344 size_t blen; 6345 6346 rconfid = sp->scp[cp->protoidx].rconfid; 6347 type = sp->scp[cp->protoidx].rcr_type; 6348 buf = sp->scp[cp->protoidx].rcr_buf; 6349 rlen = sp->scp[cp->protoidx].rcr_rlen; 6350 blen = sp->scp[cp->protoidx].rcr_blen; 6351 6352 sp->scp[cp->protoidx].rcr_buf = NULL; 6353 sp->scp[cp->protoidx].rcr_blen = 0; 6354 6355 if (buf != NULL) { 6356 if (rlen > 0) { 6357 if (debug) { 6358 log(LOG_DEBUG, "%s: send %s\n", 6359 ifp->if_xname, sppp_cp_type_name(type)); 6360 } 6361 sppp_cp_send(sp, cp->proto, type, rconfid, rlen, buf); 6362 } 6363 kmem_free(buf, blen); 6364 } 6365 } 6366 /* 6367 * This file is large. Tell emacs to highlight it nevertheless. 6368 * 6369 * Local Variables: 6370 * hilit-auto-highlight-maxout: 120000 6371 * End: 6372 */ 6373 6374 /* 6375 * Module glue 6376 */ 6377 MODULE(MODULE_CLASS_MISC, sppp_subr, NULL); 6378 6379 static int 6380 sppp_subr_modcmd(modcmd_t cmd, void *arg) 6381 { 6382 switch (cmd) { 6383 case MODULE_CMD_INIT: 6384 case MODULE_CMD_FINI: 6385 return 0; 6386 case MODULE_CMD_STAT: 6387 case MODULE_CMD_AUTOUNLOAD: 6388 default: 6389 return ENOTTY; 6390 } 6391 } 6392 6393 static void 6394 sppp_notify_up(struct sppp *sp) 6395 { 6396 6397 SPPP_LOCK(sp, RW_WRITER); 6398 lcp.Up(sp); 6399 SPPP_UNLOCK(sp); 6400 } 6401 6402 static void 6403 sppp_notify_down(struct sppp *sp) 6404 { 6405 6406 SPPP_LOCK(sp, RW_WRITER); 6407 lcp.Down(sp); 6408 SPPP_UNLOCK(sp); 6409 } 6410 6411 static void 6412 sppp_notify_tls_wlocked(struct sppp *sp) 6413 { 6414 6415 KASSERT(SPPP_WLOCKED(sp)); 6416 6417 if (!sp->pp_tls) 6418 return; 6419 6420 SPPP_UNLOCK(sp); 6421 sp->pp_tls(sp); 6422 SPPP_LOCK(sp, RW_WRITER); 6423 } 6424 6425 static void 6426 sppp_notify_tlf_wlocked(struct sppp *sp) 6427 { 6428 6429 KASSERT(SPPP_WLOCKED(sp)); 6430 6431 if (!sp->pp_tlf) 6432 return; 6433 6434 SPPP_UNLOCK(sp); 6435 sp->pp_tlf(sp); 6436 SPPP_LOCK(sp, RW_WRITER); 6437 } 6438 6439 static void 6440 sppp_notify_con(struct sppp *sp) 6441 { 6442 6443 if (!sp->pp_con) 6444 return; 6445 6446 sp->pp_con(sp); 6447 } 6448 6449 #ifdef INET6 6450 static void 6451 sppp_notify_con_wlocked(struct sppp *sp) 6452 { 6453 6454 KASSERT(SPPP_WLOCKED(sp)); 6455 6456 SPPP_UNLOCK(sp); 6457 sppp_notify_con(sp); 6458 SPPP_LOCK(sp, RW_WRITER); 6459 6460 } 6461 #endif 6462 6463 static void 6464 sppp_notify_chg_wlocked(struct sppp *sp) 6465 { 6466 6467 KASSERT(SPPP_WLOCKED(sp)); 6468 6469 if (!sp->pp_chg) 6470 return; 6471 6472 SPPP_UNLOCK(sp); 6473 sp->pp_chg(sp, sp->pp_phase); 6474 SPPP_LOCK(sp, RW_WRITER); 6475 } 6476
Indexes created Tue Sep 30 07:10:03 GMT 2025