if_spppsubr.c revision 1.106
1 /* $NetBSD: if_spppsubr.c,v 1.106 2007/07/09 21:11:00 ad 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 1.106 2007/07/09 21:11:00 ad Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_pfil_hooks.h" 50 51 #include <sys/param.h> 52 #include <sys/proc.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/sockio.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/callout.h> 61 #include <sys/md5.h> 62 #include <sys/inttypes.h> 63 #include <sys/kauth.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/if_types.h> 68 #include <net/route.h> 69 #include <net/ppp_defs.h> 70 71 #include <machine/stdarg.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #ifdef INET 77 #include <netinet/ip.h> 78 #include <netinet/tcp.h> 79 #endif 80 #include <net/ethertypes.h> 81 82 #ifdef INET6 83 #include <netinet6/scope6_var.h> 84 #endif 85 86 #ifdef IPX 87 #include <netipx/ipx.h> 88 #include <netipx/ipx_if.h> 89 #endif 90 91 92 #ifdef ISO 93 #include <netiso/argo_debug.h> 94 #include <netiso/iso.h> 95 #include <netiso/iso_var.h> 96 #include <netiso/iso_snpac.h> 97 #endif 98 99 #include <net/if_sppp.h> 100 #include <net/if_spppvar.h> 101 102 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 103 #define LOOPALIVECNT 3 /* loopback detection tries */ 104 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 105 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 106 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define CONF_REQ 1 /* PPP configure request */ 133 #define CONF_ACK 2 /* PPP configure acknowledge */ 134 #define CONF_NAK 3 /* PPP configure negative ack */ 135 #define CONF_REJ 4 /* PPP configure reject */ 136 #define TERM_REQ 5 /* PPP terminate request */ 137 #define TERM_ACK 6 /* PPP terminate acknowledge */ 138 #define CODE_REJ 7 /* PPP code reject */ 139 #define PROTO_REJ 8 /* PPP protocol reject */ 140 #define ECHO_REQ 9 /* PPP echo request */ 141 #define ECHO_REPLY 10 /* PPP echo reply */ 142 #define DISC_REQ 11 /* PPP discard request */ 143 144 #define LCP_OPT_MRU 1 /* maximum receive unit */ 145 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 146 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 147 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 148 #define LCP_OPT_MAGIC 5 /* magic number */ 149 #define LCP_OPT_RESERVED 6 /* reserved */ 150 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 151 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 152 153 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 154 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 155 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 156 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 157 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 158 159 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 160 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 161 162 #define PAP_REQ 1 /* PAP name/password request */ 163 #define PAP_ACK 2 /* PAP acknowledge */ 164 #define PAP_NAK 3 /* PAP fail */ 165 166 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 167 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 168 #define CHAP_SUCCESS 3 /* CHAP response ok */ 169 #define CHAP_FAILURE 4 /* CHAP response failed */ 170 171 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 172 173 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 174 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 175 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 176 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 177 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 178 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 179 180 /* states are named and numbered according to RFC 1661 */ 181 #define STATE_INITIAL 0 182 #define STATE_STARTING 1 183 #define STATE_CLOSED 2 184 #define STATE_STOPPED 3 185 #define STATE_CLOSING 4 186 #define STATE_STOPPING 5 187 #define STATE_REQ_SENT 6 188 #define STATE_ACK_RCVD 7 189 #define STATE_ACK_SENT 8 190 #define STATE_OPENED 9 191 192 struct ppp_header { 193 u_int8_t address; 194 u_int8_t control; 195 u_int16_t protocol; 196 } __attribute__((__packed__)); 197 #define PPP_HEADER_LEN sizeof (struct ppp_header) 198 199 struct lcp_header { 200 u_int8_t type; 201 u_int8_t ident; 202 u_int16_t len; 203 } __attribute__((__packed__)); 204 #define LCP_HEADER_LEN sizeof (struct lcp_header) 205 206 struct cisco_packet { 207 u_int32_t type; 208 u_int32_t par1; 209 u_int32_t par2; 210 u_int16_t rel; 211 u_int16_t time0; 212 u_int16_t time1; 213 } __attribute__((__packed__)); 214 #define CISCO_PACKET_LEN 18 215 216 /* 217 * We follow the spelling and capitalization of RFC 1661 here, to make 218 * it easier comparing with the standard. Please refer to this RFC in 219 * case you can't make sense out of these abbreviation; it will also 220 * explain the semantics related to the various events and actions. 221 */ 222 struct cp { 223 u_short proto; /* PPP control protocol number */ 224 u_char protoidx; /* index into state table in struct sppp */ 225 u_char flags; 226 #define CP_LCP 0x01 /* this is the LCP */ 227 #define CP_AUTH 0x02 /* this is an authentication protocol */ 228 #define CP_NCP 0x04 /* this is a NCP */ 229 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 230 const char *name; /* name of this control protocol */ 231 /* event handlers */ 232 void (*Up)(struct sppp *sp); 233 void (*Down)(struct sppp *sp); 234 void (*Open)(struct sppp *sp); 235 void (*Close)(struct sppp *sp); 236 void (*TO)(void *sp); 237 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 239 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 240 /* actions */ 241 void (*tlu)(struct sppp *sp); 242 void (*tld)(struct sppp *sp); 243 void (*tls)(struct sppp *sp); 244 void (*tlf)(struct sppp *sp); 245 void (*scr)(struct sppp *sp); 246 }; 247 248 static struct sppp *spppq; 249 static callout_t keepalive_ch; 250 251 #ifdef INET 252 /* 253 * The following disgusting hack gets around the problem that IP TOS 254 * can't be set yet. We want to put "interactive" traffic on a high 255 * priority queue. To decide if traffic is interactive, we check that 256 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 257 * 258 * XXX is this really still necessary? - joerg - 259 */ 260 static u_short interactive_ports[8] = { 261 0, 513, 0, 0, 262 0, 21, 0, 23, 263 }; 264 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 265 #endif 266 267 /* almost every function needs these */ 268 #define STDDCL \ 269 struct ifnet *ifp = &sp->pp_if; \ 270 int debug = ifp->if_flags & IFF_DEBUG 271 272 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 273 const struct sockaddr *dst, struct rtentry *rt); 274 275 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 276 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 277 278 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 279 struct mbuf *m); 280 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 281 u_char ident, u_short len, void *data); 282 /* static void sppp_cp_timeout(void *arg); */ 283 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 284 int newstate); 285 static void sppp_auth_send(const struct cp *cp, 286 struct sppp *sp, unsigned int type, unsigned int id, 287 ...); 288 289 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 293 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 294 295 static void sppp_null(struct sppp *sp); 296 297 static void sppp_lcp_init(struct sppp *sp); 298 static void sppp_lcp_up(struct sppp *sp); 299 static void sppp_lcp_down(struct sppp *sp); 300 static void sppp_lcp_open(struct sppp *sp); 301 static void sppp_lcp_close(struct sppp *sp); 302 static void sppp_lcp_TO(void *sp); 303 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 306 static void sppp_lcp_tlu(struct sppp *sp); 307 static void sppp_lcp_tld(struct sppp *sp); 308 static void sppp_lcp_tls(struct sppp *sp); 309 static void sppp_lcp_tlf(struct sppp *sp); 310 static void sppp_lcp_scr(struct sppp *sp); 311 static void sppp_lcp_check_and_close(struct sppp *sp); 312 static int sppp_ncp_check(struct sppp *sp); 313 314 static void sppp_ipcp_init(struct sppp *sp); 315 static void sppp_ipcp_up(struct sppp *sp); 316 static void sppp_ipcp_down(struct sppp *sp); 317 static void sppp_ipcp_open(struct sppp *sp); 318 static void sppp_ipcp_close(struct sppp *sp); 319 static void sppp_ipcp_TO(void *sp); 320 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipcp_tlu(struct sppp *sp); 324 static void sppp_ipcp_tld(struct sppp *sp); 325 static void sppp_ipcp_tls(struct sppp *sp); 326 static void sppp_ipcp_tlf(struct sppp *sp); 327 static void sppp_ipcp_scr(struct sppp *sp); 328 329 static void sppp_ipv6cp_init(struct sppp *sp); 330 static void sppp_ipv6cp_up(struct sppp *sp); 331 static void sppp_ipv6cp_down(struct sppp *sp); 332 static void sppp_ipv6cp_open(struct sppp *sp); 333 static void sppp_ipv6cp_close(struct sppp *sp); 334 static void sppp_ipv6cp_TO(void *sp); 335 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 338 static void sppp_ipv6cp_tlu(struct sppp *sp); 339 static void sppp_ipv6cp_tld(struct sppp *sp); 340 static void sppp_ipv6cp_tls(struct sppp *sp); 341 static void sppp_ipv6cp_tlf(struct sppp *sp); 342 static void sppp_ipv6cp_scr(struct sppp *sp); 343 344 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_pap_init(struct sppp *sp); 346 static void sppp_pap_open(struct sppp *sp); 347 static void sppp_pap_close(struct sppp *sp); 348 static void sppp_pap_TO(void *sp); 349 static void sppp_pap_my_TO(void *sp); 350 static void sppp_pap_tlu(struct sppp *sp); 351 static void sppp_pap_tld(struct sppp *sp); 352 static void sppp_pap_scr(struct sppp *sp); 353 354 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 355 static void sppp_chap_init(struct sppp *sp); 356 static void sppp_chap_open(struct sppp *sp); 357 static void sppp_chap_close(struct sppp *sp); 358 static void sppp_chap_TO(void *sp); 359 static void sppp_chap_tlu(struct sppp *sp); 360 static void sppp_chap_tld(struct sppp *sp); 361 static void sppp_chap_scr(struct sppp *sp); 362 363 static const char *sppp_auth_type_name(u_short proto, u_char type); 364 static const char *sppp_cp_type_name(u_char type); 365 static const char *sppp_dotted_quad(u_int32_t addr); 366 static const char *sppp_ipcp_opt_name(u_char opt); 367 #ifdef INET6 368 static const char *sppp_ipv6cp_opt_name(u_char opt); 369 #endif 370 static const char *sppp_lcp_opt_name(u_char opt); 371 static const char *sppp_phase_name(int phase); 372 static const char *sppp_proto_name(u_short proto); 373 static const char *sppp_state_name(int state); 374 static int sppp_params(struct sppp *sp, int cmd, void *data); 375 #ifdef INET 376 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 377 u_int32_t *srcmask); 378 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #endif 381 static void sppp_keepalive(void *dummy); 382 static void sppp_phase_network(struct sppp *sp); 383 static void sppp_print_bytes(const u_char *p, u_short len); 384 static void sppp_print_string(const char *p, u_short len); 385 #ifdef INET6 386 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 387 struct in6_addr *dst, struct in6_addr *srcmask); 388 #ifdef IPV6CP_MYIFID_DYN 389 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 390 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 391 #endif 392 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 393 #endif 394 395 /* our control protocol descriptors */ 396 static const struct cp lcp = { 397 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 398 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 399 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 400 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 401 sppp_lcp_scr 402 }; 403 404 static const struct cp ipcp = { 405 PPP_IPCP, IDX_IPCP, 406 #ifdef INET 407 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 408 #else 409 0, 410 #endif 411 "ipcp", 412 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 413 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 414 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 415 sppp_ipcp_scr 416 }; 417 418 static const struct cp ipv6cp = { 419 PPP_IPV6CP, IDX_IPV6CP, 420 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 421 CP_NCP, 422 #else 423 0, 424 #endif 425 "ipv6cp", 426 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 427 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 428 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 429 sppp_ipv6cp_scr 430 }; 431 432 static const struct cp pap = { 433 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 434 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 435 sppp_pap_TO, 0, 0, 0, 436 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 437 sppp_pap_scr 438 }; 439 440 static const struct cp chap = { 441 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 442 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 443 sppp_chap_TO, 0, 0, 0, 444 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 445 sppp_chap_scr 446 }; 447 448 static const struct cp *cps[IDX_COUNT] = { 449 &lcp, /* IDX_LCP */ 450 &ipcp, /* IDX_IPCP */ 451 &ipv6cp, /* IDX_IPV6CP */ 452 &pap, /* IDX_PAP */ 453 &chap, /* IDX_CHAP */ 454 }; 455 456 457 void spppattach(int); 458 void 459 /*ARGSUSED*/ 460 spppattach(int count) 461 { 462 } 463 464 /* 465 * Exported functions, comprising our interface to the lower layer. 466 */ 467 468 /* 469 * Process the received packet. 470 */ 471 void 472 sppp_input(struct ifnet *ifp, struct mbuf *m) 473 { 474 struct ppp_header *h = NULL; 475 struct ifqueue *inq = 0; 476 u_int16_t protocol; 477 int s; 478 struct sppp *sp = (struct sppp *)ifp; 479 int debug = ifp->if_flags & IFF_DEBUG; 480 481 if (ifp->if_flags & IFF_UP) { 482 /* Count received bytes, add hardware framing */ 483 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 484 /* Note time of last receive */ 485 sp->pp_last_receive = time_uptime; 486 } 487 488 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 489 /* Too small packet, drop it. */ 490 if (debug) 491 log(LOG_DEBUG, 492 "%s: input packet is too small, %d bytes\n", 493 ifp->if_xname, m->m_pkthdr.len); 494 drop: 495 ++ifp->if_ierrors; 496 ++ifp->if_iqdrops; 497 m_freem(m); 498 return; 499 } 500 501 if (sp->pp_flags & PP_NOFRAMING) { 502 memcpy(&protocol, mtod(m, void *), 2); 503 protocol = ntohs(protocol); 504 m_adj(m, 2); 505 } else { 506 507 /* Get PPP header. */ 508 h = mtod(m, struct ppp_header *); 509 m_adj(m, PPP_HEADER_LEN); 510 511 switch (h->address) { 512 case PPP_ALLSTATIONS: 513 if (h->control != PPP_UI) 514 goto invalid; 515 if (sp->pp_flags & PP_CISCO) { 516 if (debug) 517 log(LOG_DEBUG, 518 "%s: PPP packet in Cisco mode " 519 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 520 ifp->if_xname, 521 h->address, h->control, ntohs(h->protocol)); 522 goto drop; 523 } 524 break; 525 case CISCO_MULTICAST: 526 case CISCO_UNICAST: 527 /* Don't check the control field here (RFC 1547). */ 528 if (! (sp->pp_flags & PP_CISCO)) { 529 if (debug) 530 log(LOG_DEBUG, 531 "%s: Cisco packet in PPP mode " 532 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 533 ifp->if_xname, 534 h->address, h->control, ntohs(h->protocol)); 535 goto drop; 536 } 537 switch (ntohs(h->protocol)) { 538 default: 539 ++ifp->if_noproto; 540 goto invalid; 541 case CISCO_KEEPALIVE: 542 sppp_cisco_input((struct sppp *) ifp, m); 543 m_freem(m); 544 return; 545 #ifdef INET 546 case ETHERTYPE_IP: 547 schednetisr(NETISR_IP); 548 inq = &ipintrq; 549 break; 550 #endif 551 #ifdef INET6 552 case ETHERTYPE_IPV6: 553 schednetisr(NETISR_IPV6); 554 inq = &ip6intrq; 555 break; 556 #endif 557 #ifdef IPX 558 case ETHERTYPE_IPX: 559 schednetisr(NETISR_IPX); 560 inq = &ipxintrq; 561 break; 562 #endif 563 } 564 goto queue_pkt; 565 default: /* Invalid PPP packet. */ 566 invalid: 567 if (debug) 568 log(LOG_DEBUG, 569 "%s: invalid input packet " 570 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 571 ifp->if_xname, 572 h->address, h->control, ntohs(h->protocol)); 573 goto drop; 574 } 575 protocol = ntohs(h->protocol); 576 } 577 578 switch (protocol) { 579 default: 580 if (sp->state[IDX_LCP] == STATE_OPENED) { 581 u_int16_t prot = htons(protocol); 582 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 583 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 584 &prot); 585 } 586 if (debug) 587 log(LOG_DEBUG, 588 "%s: invalid input protocol " 589 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 590 ++ifp->if_noproto; 591 goto drop; 592 case PPP_LCP: 593 sppp_cp_input(&lcp, sp, m); 594 m_freem(m); 595 return; 596 case PPP_PAP: 597 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 598 sppp_pap_input(sp, m); 599 m_freem(m); 600 return; 601 case PPP_CHAP: 602 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 603 sppp_chap_input(sp, m); 604 m_freem(m); 605 return; 606 #ifdef INET 607 case PPP_IPCP: 608 if (sp->pp_phase == SPPP_PHASE_NETWORK) 609 sppp_cp_input(&ipcp, sp, m); 610 m_freem(m); 611 return; 612 case PPP_IP: 613 if (sp->state[IDX_IPCP] == STATE_OPENED) { 614 schednetisr(NETISR_IP); 615 inq = &ipintrq; 616 sp->pp_last_activity = time_uptime; 617 } 618 break; 619 #endif 620 #ifdef INET6 621 case PPP_IPV6CP: 622 if (sp->pp_phase == SPPP_PHASE_NETWORK) 623 sppp_cp_input(&ipv6cp, sp, m); 624 m_freem(m); 625 return; 626 627 case PPP_IPV6: 628 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 629 schednetisr(NETISR_IPV6); 630 inq = &ip6intrq; 631 sp->pp_last_activity = time_uptime; 632 } 633 break; 634 #endif 635 #ifdef IPX 636 case PPP_IPX: 637 /* IPX IPXCP not implemented yet */ 638 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 639 schednetisr(NETISR_IPX); 640 inq = &ipxintrq; 641 } 642 break; 643 #endif 644 #ifdef ISO 645 case PPP_ISO: 646 /* OSI NLCP not implemented yet */ 647 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 648 schednetisr(NETISR_ISO); 649 inq = &clnlintrq; 650 } 651 break; 652 #endif 653 } 654 655 queue_pkt: 656 if (! (ifp->if_flags & IFF_UP) || ! inq) 657 goto drop; 658 659 /* Check queue. */ 660 s = splnet(); 661 if (IF_QFULL(inq)) { 662 /* Queue overflow. */ 663 IF_DROP(inq); 664 splx(s); 665 if (debug) 666 log(LOG_DEBUG, "%s: protocol queue overflow\n", 667 ifp->if_xname); 668 goto drop; 669 } 670 IF_ENQUEUE(inq, m); 671 splx(s); 672 } 673 674 /* 675 * Enqueue transmit packet. 676 */ 677 static int 678 sppp_output(struct ifnet *ifp, struct mbuf *m, 679 const struct sockaddr *dst, struct rtentry *rt) 680 { 681 struct sppp *sp = (struct sppp *) ifp; 682 struct ppp_header *h = NULL; 683 struct ifqueue *ifq = NULL; /* XXX */ 684 int s, error = 0; 685 u_int16_t protocol; 686 ALTQ_DECL(struct altq_pktattr pktattr;) 687 688 s = splnet(); 689 690 sp->pp_last_activity = time_uptime; 691 692 if ((ifp->if_flags & IFF_UP) == 0 || 693 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 694 m_freem(m); 695 splx(s); 696 return (ENETDOWN); 697 } 698 699 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 700 /* 701 * Interface is not yet running, but auto-dial. Need 702 * to start LCP for it. 703 */ 704 ifp->if_flags |= IFF_RUNNING; 705 splx(s); 706 lcp.Open(sp); 707 s = splnet(); 708 } 709 710 /* 711 * If the queueing discipline needs packet classification, 712 * do it before prepending link headers. 713 */ 714 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 715 716 #ifdef INET 717 if (dst->sa_family == AF_INET) { 718 struct ip *ip = NULL; 719 struct tcphdr *th = NULL; 720 721 if (m->m_len >= sizeof(struct ip)) { 722 ip = mtod(m, struct ip *); 723 if (ip->ip_p == IPPROTO_TCP && 724 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 725 sizeof(struct tcphdr)) { 726 th = (struct tcphdr *) 727 ((char *)ip + (ip->ip_hl << 2)); 728 } 729 } else 730 ip = NULL; 731 732 /* 733 * When using dynamic local IP address assignment by using 734 * 0.0.0.0 as a local address, the first TCP session will 735 * not connect because the local TCP checksum is computed 736 * using 0.0.0.0 which will later become our real IP address 737 * so the TCP checksum computed at the remote end will 738 * become invalid. So we 739 * - don't let packets with src ip addr 0 thru 740 * - we flag TCP packets with src ip 0 as an error 741 */ 742 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 743 u_int8_t proto = ip->ip_p; 744 745 m_freem(m); 746 splx(s); 747 if (proto == IPPROTO_TCP) 748 return (EADDRNOTAVAIL); 749 else 750 return (0); 751 } 752 753 /* 754 * Put low delay, telnet, rlogin and ftp control packets 755 * in front of the queue. 756 */ 757 758 if (!IF_QFULL(&sp->pp_fastq) && 759 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 760 (th && (INTERACTIVE(ntohs(th->th_sport)) || 761 INTERACTIVE(ntohs(th->th_dport)))))) 762 ifq = &sp->pp_fastq; 763 } 764 #endif 765 766 #ifdef INET6 767 if (dst->sa_family == AF_INET6) { 768 /* XXX do something tricky here? */ 769 } 770 #endif 771 772 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 773 /* 774 * Prepend general data packet PPP header. For now, IP only. 775 */ 776 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 777 if (! m) { 778 if (ifp->if_flags & IFF_DEBUG) 779 log(LOG_DEBUG, "%s: no memory for transmit header\n", 780 ifp->if_xname); 781 ++ifp->if_oerrors; 782 splx(s); 783 return (ENOBUFS); 784 } 785 /* 786 * May want to check size of packet 787 * (albeit due to the implementation it's always enough) 788 */ 789 h = mtod(m, struct ppp_header *); 790 if (sp->pp_flags & PP_CISCO) { 791 h->address = CISCO_UNICAST; /* unicast address */ 792 h->control = 0; 793 } else { 794 h->address = PPP_ALLSTATIONS; /* broadcast address */ 795 h->control = PPP_UI; /* Unnumbered Info */ 796 } 797 } 798 799 switch (dst->sa_family) { 800 #ifdef INET 801 case AF_INET: /* Internet Protocol */ 802 if (sp->pp_flags & PP_CISCO) 803 protocol = htons(ETHERTYPE_IP); 804 else { 805 /* 806 * Don't choke with an ENETDOWN early. It's 807 * possible that we just started dialing out, 808 * so don't drop the packet immediately. If 809 * we notice that we run out of buffer space 810 * below, we will however remember that we are 811 * not ready to carry IP packets, and return 812 * ENETDOWN, as opposed to ENOBUFS. 813 */ 814 protocol = htons(PPP_IP); 815 if (sp->state[IDX_IPCP] != STATE_OPENED) 816 error = ENETDOWN; 817 } 818 break; 819 #endif 820 #ifdef INET6 821 case AF_INET6: /* Internet Protocol version 6 */ 822 if (sp->pp_flags & PP_CISCO) 823 protocol = htons(ETHERTYPE_IPV6); 824 else { 825 /* 826 * Don't choke with an ENETDOWN early. It's 827 * possible that we just started dialing out, 828 * so don't drop the packet immediately. If 829 * we notice that we run out of buffer space 830 * below, we will however remember that we are 831 * not ready to carry IP packets, and return 832 * ENETDOWN, as opposed to ENOBUFS. 833 */ 834 protocol = htons(PPP_IPV6); 835 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 836 error = ENETDOWN; 837 } 838 break; 839 #endif 840 #ifdef IPX 841 case AF_IPX: /* Novell IPX Protocol */ 842 protocol = htons((sp->pp_flags & PP_CISCO) ? 843 ETHERTYPE_IPX : PPP_IPX); 844 break; 845 #endif 846 #ifdef ISO 847 case AF_ISO: /* ISO OSI Protocol */ 848 if (sp->pp_flags & PP_CISCO) 849 goto nosupport; 850 protocol = htons(PPP_ISO); 851 break; 852 nosupport: 853 #endif 854 default: 855 m_freem(m); 856 ++ifp->if_oerrors; 857 splx(s); 858 return (EAFNOSUPPORT); 859 } 860 861 if (sp->pp_flags & PP_NOFRAMING) { 862 M_PREPEND(m, 2, M_DONTWAIT); 863 if (m == NULL) { 864 if (ifp->if_flags & IFF_DEBUG) 865 log(LOG_DEBUG, "%s: no memory for transmit header\n", 866 ifp->if_xname); 867 ++ifp->if_oerrors; 868 splx(s); 869 return (ENOBUFS); 870 } 871 *mtod(m, u_int16_t *) = protocol; 872 } else { 873 h->protocol = protocol; 874 } 875 876 877 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 878 879 if (error == 0) { 880 /* 881 * Count output packets and bytes. 882 * The packet length includes header + additional hardware 883 * framing according to RFC 1333. 884 */ 885 if (!(ifp->if_flags & IFF_OACTIVE)) 886 (*ifp->if_start)(ifp); 887 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 888 } 889 splx(s); 890 return error; 891 } 892 893 void 894 sppp_attach(struct ifnet *ifp) 895 { 896 struct sppp *sp = (struct sppp *) ifp; 897 898 /* Initialize keepalive handler. */ 899 if (! spppq) { 900 callout_init(&keepalive_ch, 0); 901 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 902 } 903 904 /* Insert new entry into the keepalive list. */ 905 sp->pp_next = spppq; 906 spppq = sp; 907 908 sp->pp_if.if_type = IFT_PPP; 909 sp->pp_if.if_output = sppp_output; 910 sp->pp_fastq.ifq_maxlen = 32; 911 sp->pp_cpq.ifq_maxlen = 20; 912 sp->pp_loopcnt = 0; 913 sp->pp_alivecnt = 0; 914 sp->pp_last_activity = 0; 915 sp->pp_last_receive = 0; 916 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 917 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 918 sp->pp_idle_timeout = 0; 919 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 920 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 921 sp->pp_auth_failures = 0; 922 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 923 sp->pp_phase = SPPP_PHASE_DEAD; 924 sp->pp_up = lcp.Up; 925 sp->pp_down = lcp.Down; 926 927 if_alloc_sadl(ifp); 928 929 memset(&sp->myauth, 0, sizeof sp->myauth); 930 memset(&sp->hisauth, 0, sizeof sp->hisauth); 931 sppp_lcp_init(sp); 932 sppp_ipcp_init(sp); 933 sppp_ipv6cp_init(sp); 934 sppp_pap_init(sp); 935 sppp_chap_init(sp); 936 } 937 938 void 939 sppp_detach(struct ifnet *ifp) 940 { 941 struct sppp **q, *p, *sp = (struct sppp *) ifp; 942 int i; 943 944 /* Remove the entry from the keepalive list. */ 945 for (q = &spppq; (p = *q); q = &p->pp_next) 946 if (p == sp) { 947 *q = p->pp_next; 948 break; 949 } 950 951 /* Stop keepalive handler. */ 952 if (! spppq) { 953 callout_stop(&keepalive_ch); 954 } 955 956 for (i = 0; i < IDX_COUNT; i++) { 957 callout_stop(&sp->ch[i]); 958 } 959 callout_stop(&sp->pap_my_to_ch); 960 961 /* free authentication info */ 962 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 963 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 964 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 965 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 966 967 #if 0 /* done in if_detach() */ 968 if_free_sadl(ifp); 969 #endif 970 } 971 972 /* 973 * Flush the interface output queue. 974 */ 975 void 976 sppp_flush(struct ifnet *ifp) 977 { 978 struct sppp *sp = (struct sppp *) ifp; 979 980 IFQ_PURGE(&sp->pp_if.if_snd); 981 IF_PURGE(&sp->pp_fastq); 982 IF_PURGE(&sp->pp_cpq); 983 } 984 985 /* 986 * Check if the output queue is empty. 987 */ 988 int 989 sppp_isempty(struct ifnet *ifp) 990 { 991 struct sppp *sp = (struct sppp *) ifp; 992 int empty, s; 993 994 s = splnet(); 995 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 996 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 997 splx(s); 998 return (empty); 999 } 1000 1001 /* 1002 * Get next packet to send. 1003 */ 1004 struct mbuf * 1005 sppp_dequeue(struct ifnet *ifp) 1006 { 1007 struct sppp *sp = (struct sppp *) ifp; 1008 struct mbuf *m; 1009 int s; 1010 1011 s = splnet(); 1012 /* 1013 * Process only the control protocol queue until we have at 1014 * least one NCP open. 1015 * 1016 * Do always serve all three queues in Cisco mode. 1017 */ 1018 IF_DEQUEUE(&sp->pp_cpq, m); 1019 if (m == NULL && 1020 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1021 IF_DEQUEUE(&sp->pp_fastq, m); 1022 if (m == NULL) 1023 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1024 } 1025 splx(s); 1026 return m; 1027 } 1028 1029 /* 1030 * Process an ioctl request. Called on low priority level. 1031 */ 1032 int 1033 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1034 { 1035 struct lwp *l = curlwp; /* XXX */ 1036 struct ifreq *ifr = (struct ifreq *) data; 1037 struct sppp *sp = (struct sppp *) ifp; 1038 int s, error=0, going_up, going_down, newmode; 1039 1040 s = splnet(); 1041 switch (cmd) { 1042 case SIOCAIFADDR: 1043 case SIOCSIFDSTADDR: 1044 case SIOCSIFADDR: 1045 break; 1046 1047 case SIOCSIFFLAGS: 1048 going_up = ifp->if_flags & IFF_UP && 1049 (ifp->if_flags & IFF_RUNNING) == 0; 1050 going_down = (ifp->if_flags & IFF_UP) == 0 && 1051 ifp->if_flags & IFF_RUNNING; 1052 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1053 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1054 /* sanity */ 1055 newmode = IFF_PASSIVE; 1056 ifp->if_flags &= ~IFF_AUTO; 1057 } 1058 1059 if (going_up || going_down) 1060 lcp.Close(sp); 1061 if (going_up && newmode == 0) { 1062 /* neither auto-dial nor passive */ 1063 ifp->if_flags |= IFF_RUNNING; 1064 if (!(sp->pp_flags & PP_CISCO)) 1065 lcp.Open(sp); 1066 } else if (going_down) { 1067 sppp_flush(ifp); 1068 ifp->if_flags &= ~IFF_RUNNING; 1069 } 1070 1071 break; 1072 1073 #ifdef SIOCSIFMTU 1074 #ifndef ifr_mtu 1075 #define ifr_mtu ifr_metric 1076 #endif 1077 case SIOCSIFMTU: 1078 if (ifr->ifr_mtu < PPP_MINMRU || 1079 ifr->ifr_mtu > sp->lcp.their_mru) { 1080 error = EINVAL; 1081 break; 1082 } 1083 1084 ifp->if_mtu = ifr->ifr_mtu; 1085 break; 1086 #endif 1087 #ifdef SLIOCSETMTU 1088 case SLIOCSETMTU: 1089 if (*(short *)data < PPP_MINMRU || 1090 *(short *)data > sp->lcp.their_mru) 1091 { 1092 error = EINVAL; 1093 break; 1094 } 1095 1096 ifp->if_mtu = *(short *)data; 1097 break; 1098 #endif 1099 #ifdef SIOCGIFMTU 1100 case SIOCGIFMTU: 1101 ifr->ifr_mtu = ifp->if_mtu; 1102 break; 1103 #endif 1104 #ifdef SLIOCGETMTU 1105 case SLIOCGETMTU: 1106 *(short *)data = ifp->if_mtu; 1107 break; 1108 #endif 1109 case SIOCADDMULTI: 1110 case SIOCDELMULTI: 1111 break; 1112 1113 case SPPPSETAUTHCFG: 1114 case SPPPSETLCPCFG: 1115 case SPPPSETIDLETO: 1116 case SPPPSETAUTHFAILURE: 1117 case SPPPSETDNSOPTS: 1118 case SPPPSETKEEPALIVE: 1119 error = kauth_authorize_network(l->l_cred, 1120 KAUTH_NETWORK_INTERFACE, 1121 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1122 NULL); 1123 if (error) 1124 break; 1125 error = sppp_params(sp, cmd, data); 1126 break; 1127 1128 case SPPPGETAUTHCFG: 1129 case SPPPGETLCPCFG: 1130 case SPPPGETAUTHFAILURES: 1131 error = kauth_authorize_network(l->l_cred, 1132 KAUTH_NETWORK_INTERFACE, 1133 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1134 NULL); 1135 if (error) 1136 break; 1137 error = sppp_params(sp, cmd, data); 1138 break; 1139 1140 case SPPPGETSTATUS: 1141 case SPPPGETSTATUSNCP: 1142 case SPPPGETIDLETO: 1143 case SPPPGETDNSOPTS: 1144 case SPPPGETDNSADDRS: 1145 case SPPPGETKEEPALIVE: 1146 error = sppp_params(sp, cmd, data); 1147 break; 1148 1149 default: 1150 error = ENOTTY; 1151 } 1152 splx(s); 1153 return (error); 1154 } 1155 1156 1157 /* 1158 * Cisco framing implementation. 1159 */ 1160 1161 /* 1162 * Handle incoming Cisco keepalive protocol packets. 1163 */ 1164 static void 1165 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1166 { 1167 STDDCL; 1168 struct cisco_packet *h; 1169 #ifdef INET 1170 u_int32_t me, mymask = 0; /* XXX: GCC */ 1171 #endif 1172 1173 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1174 if (debug) 1175 log(LOG_DEBUG, 1176 "%s: cisco invalid packet length: %d bytes\n", 1177 ifp->if_xname, m->m_pkthdr.len); 1178 return; 1179 } 1180 h = mtod(m, struct cisco_packet *); 1181 if (debug) 1182 log(LOG_DEBUG, 1183 "%s: cisco input: %d bytes " 1184 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1185 ifp->if_xname, m->m_pkthdr.len, 1186 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1187 (u_int)h->time0, (u_int)h->time1); 1188 switch (ntohl(h->type)) { 1189 default: 1190 if (debug) 1191 addlog("%s: cisco unknown packet type: 0x%x\n", 1192 ifp->if_xname, ntohl(h->type)); 1193 break; 1194 case CISCO_ADDR_REPLY: 1195 /* Reply on address request, ignore */ 1196 break; 1197 case CISCO_KEEPALIVE_REQ: 1198 sp->pp_alivecnt = 0; 1199 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1200 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1201 /* Local and remote sequence numbers are equal. 1202 * Probably, the line is in loopback mode. */ 1203 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1204 printf ("%s: loopback\n", 1205 ifp->if_xname); 1206 sp->pp_loopcnt = 0; 1207 if (ifp->if_flags & IFF_UP) { 1208 if_down(ifp); 1209 IF_PURGE(&sp->pp_cpq); 1210 } 1211 } 1212 ++sp->pp_loopcnt; 1213 1214 /* Generate new local sequence number */ 1215 sp->pp_seq[IDX_LCP] = arc4random(); 1216 break; 1217 } 1218 sp->pp_loopcnt = 0; 1219 if (! (ifp->if_flags & IFF_UP) && 1220 (ifp->if_flags & IFF_RUNNING)) { 1221 if_up(ifp); 1222 } 1223 break; 1224 case CISCO_ADDR_REQ: 1225 #ifdef INET 1226 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1227 if (me != 0L) 1228 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1229 #endif 1230 break; 1231 } 1232 } 1233 1234 /* 1235 * Send Cisco keepalive packet. 1236 */ 1237 static void 1238 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1239 { 1240 STDDCL; 1241 struct ppp_header *h; 1242 struct cisco_packet *ch; 1243 struct mbuf *m; 1244 u_int32_t t; 1245 1246 t = time_uptime * 1000; 1247 MGETHDR(m, M_DONTWAIT, MT_DATA); 1248 if (! m) 1249 return; 1250 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1251 m->m_pkthdr.rcvif = 0; 1252 1253 h = mtod(m, struct ppp_header *); 1254 h->address = CISCO_MULTICAST; 1255 h->control = 0; 1256 h->protocol = htons(CISCO_KEEPALIVE); 1257 1258 ch = (struct cisco_packet *)(h + 1); 1259 ch->type = htonl(type); 1260 ch->par1 = htonl(par1); 1261 ch->par2 = htonl(par2); 1262 ch->rel = -1; 1263 1264 ch->time0 = htons((u_short)(t >> 16)); 1265 ch->time1 = htons((u_short) t); 1266 1267 if (debug) 1268 log(LOG_DEBUG, 1269 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1270 ifp->if_xname, ntohl(ch->type), ch->par1, 1271 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1272 (u_int)ch->time1); 1273 1274 if (IF_QFULL(&sp->pp_cpq)) { 1275 IF_DROP(&sp->pp_fastq); 1276 IF_DROP(&ifp->if_snd); 1277 m_freem(m); 1278 ++ifp->if_oerrors; 1279 return; 1280 } else 1281 IF_ENQUEUE(&sp->pp_cpq, m); 1282 if (! (ifp->if_flags & IFF_OACTIVE)) 1283 (*ifp->if_start)(ifp); 1284 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1285 } 1286 1287 /* 1288 * PPP protocol implementation. 1289 */ 1290 1291 /* 1292 * Send PPP control protocol packet. 1293 */ 1294 static void 1295 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1296 u_char ident, u_short len, void *data) 1297 { 1298 STDDCL; 1299 struct lcp_header *lh; 1300 struct mbuf *m; 1301 size_t pkthdrlen; 1302 1303 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1304 1305 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1306 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1307 MGETHDR(m, M_DONTWAIT, MT_DATA); 1308 if (! m) 1309 return; 1310 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1311 m->m_pkthdr.rcvif = 0; 1312 1313 if (sp->pp_flags & PP_NOFRAMING) { 1314 *mtod(m, u_int16_t *) = htons(proto); 1315 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1316 } else { 1317 struct ppp_header *h; 1318 h = mtod(m, struct ppp_header *); 1319 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1320 h->control = PPP_UI; /* Unnumbered Info */ 1321 h->protocol = htons(proto); /* Link Control Protocol */ 1322 lh = (struct lcp_header *)(h + 1); 1323 } 1324 lh->type = type; 1325 lh->ident = ident; 1326 lh->len = htons(LCP_HEADER_LEN + len); 1327 if (len) 1328 bcopy (data, lh + 1, len); 1329 1330 if (debug) { 1331 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1332 ifp->if_xname, 1333 sppp_proto_name(proto), 1334 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1335 if (len) 1336 sppp_print_bytes((u_char *)(lh + 1), len); 1337 addlog(">\n"); 1338 } 1339 if (IF_QFULL(&sp->pp_cpq)) { 1340 IF_DROP(&sp->pp_fastq); 1341 IF_DROP(&ifp->if_snd); 1342 m_freem(m); 1343 ++ifp->if_oerrors; 1344 return; 1345 } else 1346 IF_ENQUEUE(&sp->pp_cpq, m); 1347 if (! (ifp->if_flags & IFF_OACTIVE)) 1348 (*ifp->if_start)(ifp); 1349 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1350 } 1351 1352 /* 1353 * Handle incoming PPP control protocol packets. 1354 */ 1355 static void 1356 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1357 { 1358 STDDCL; 1359 struct lcp_header *h; 1360 int printlen, len = m->m_pkthdr.len; 1361 int rv; 1362 u_char *p; 1363 u_int32_t u32; 1364 1365 if (len < 4) { 1366 if (debug) 1367 log(LOG_DEBUG, 1368 "%s: %s invalid packet length: %d bytes\n", 1369 ifp->if_xname, cp->name, len); 1370 return; 1371 } 1372 h = mtod(m, struct lcp_header *); 1373 if (debug) { 1374 printlen = ntohs(h->len); 1375 log(LOG_DEBUG, 1376 "%s: %s input(%s): <%s id=0x%x len=%d", 1377 ifp->if_xname, cp->name, 1378 sppp_state_name(sp->state[cp->protoidx]), 1379 sppp_cp_type_name(h->type), h->ident, printlen); 1380 if (len < printlen) 1381 printlen = len; 1382 if (printlen > 4) 1383 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1384 addlog(">\n"); 1385 } 1386 if (len > ntohs(h->len)) 1387 len = ntohs(h->len); 1388 p = (u_char *)(h + 1); 1389 switch (h->type) { 1390 case CONF_REQ: 1391 if (len < 4) { 1392 if (debug) 1393 addlog("%s: %s invalid conf-req length %d\n", 1394 ifp->if_xname, cp->name, 1395 len); 1396 ++ifp->if_ierrors; 1397 break; 1398 } 1399 /* handle states where RCR doesn't get a SCA/SCN */ 1400 switch (sp->state[cp->protoidx]) { 1401 case STATE_CLOSING: 1402 case STATE_STOPPING: 1403 return; 1404 case STATE_CLOSED: 1405 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1406 0, 0); 1407 return; 1408 } 1409 rv = (cp->RCR)(sp, h, len); 1410 if (rv < 0) { 1411 /* fatal error, shut down */ 1412 (cp->tld)(sp); 1413 sppp_lcp_tlf(sp); 1414 return; 1415 } 1416 switch (sp->state[cp->protoidx]) { 1417 case STATE_OPENED: 1418 (cp->tld)(sp); 1419 (cp->scr)(sp); 1420 /* fall through... */ 1421 case STATE_ACK_SENT: 1422 case STATE_REQ_SENT: 1423 sppp_cp_change_state(cp, sp, rv? 1424 STATE_ACK_SENT: STATE_REQ_SENT); 1425 break; 1426 case STATE_STOPPED: 1427 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1428 (cp->scr)(sp); 1429 sppp_cp_change_state(cp, sp, rv? 1430 STATE_ACK_SENT: STATE_REQ_SENT); 1431 break; 1432 case STATE_ACK_RCVD: 1433 if (rv) { 1434 sppp_cp_change_state(cp, sp, STATE_OPENED); 1435 if (debug) 1436 log(LOG_DEBUG, "%s: %s tlu\n", 1437 ifp->if_xname, 1438 cp->name); 1439 (cp->tlu)(sp); 1440 } else 1441 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1442 break; 1443 default: 1444 printf("%s: %s illegal %s in state %s\n", 1445 ifp->if_xname, cp->name, 1446 sppp_cp_type_name(h->type), 1447 sppp_state_name(sp->state[cp->protoidx])); 1448 ++ifp->if_ierrors; 1449 } 1450 break; 1451 case CONF_ACK: 1452 if (h->ident != sp->confid[cp->protoidx]) { 1453 if (debug) 1454 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1455 ifp->if_xname, cp->name, 1456 h->ident, sp->confid[cp->protoidx]); 1457 ++ifp->if_ierrors; 1458 break; 1459 } 1460 switch (sp->state[cp->protoidx]) { 1461 case STATE_CLOSED: 1462 case STATE_STOPPED: 1463 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1464 break; 1465 case STATE_CLOSING: 1466 case STATE_STOPPING: 1467 break; 1468 case STATE_REQ_SENT: 1469 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1470 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1471 break; 1472 case STATE_OPENED: 1473 (cp->tld)(sp); 1474 /* fall through */ 1475 case STATE_ACK_RCVD: 1476 (cp->scr)(sp); 1477 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1478 break; 1479 case STATE_ACK_SENT: 1480 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1481 sppp_cp_change_state(cp, sp, STATE_OPENED); 1482 if (debug) 1483 log(LOG_DEBUG, "%s: %s tlu\n", 1484 ifp->if_xname, cp->name); 1485 (cp->tlu)(sp); 1486 break; 1487 default: 1488 printf("%s: %s illegal %s in state %s\n", 1489 ifp->if_xname, cp->name, 1490 sppp_cp_type_name(h->type), 1491 sppp_state_name(sp->state[cp->protoidx])); 1492 ++ifp->if_ierrors; 1493 } 1494 break; 1495 case CONF_NAK: 1496 case CONF_REJ: 1497 if (h->ident != sp->confid[cp->protoidx]) { 1498 if (debug) 1499 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1500 ifp->if_xname, cp->name, 1501 h->ident, sp->confid[cp->protoidx]); 1502 ++ifp->if_ierrors; 1503 break; 1504 } 1505 if (h->type == CONF_NAK) 1506 (cp->RCN_nak)(sp, h, len); 1507 else /* CONF_REJ */ 1508 (cp->RCN_rej)(sp, h, len); 1509 1510 switch (sp->state[cp->protoidx]) { 1511 case STATE_CLOSED: 1512 case STATE_STOPPED: 1513 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1514 break; 1515 case STATE_REQ_SENT: 1516 case STATE_ACK_SENT: 1517 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1518 (cp->scr)(sp); 1519 break; 1520 case STATE_OPENED: 1521 (cp->tld)(sp); 1522 /* fall through */ 1523 case STATE_ACK_RCVD: 1524 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1525 (cp->scr)(sp); 1526 break; 1527 case STATE_CLOSING: 1528 case STATE_STOPPING: 1529 break; 1530 default: 1531 printf("%s: %s illegal %s in state %s\n", 1532 ifp->if_xname, cp->name, 1533 sppp_cp_type_name(h->type), 1534 sppp_state_name(sp->state[cp->protoidx])); 1535 ++ifp->if_ierrors; 1536 } 1537 break; 1538 1539 case TERM_REQ: 1540 switch (sp->state[cp->protoidx]) { 1541 case STATE_ACK_RCVD: 1542 case STATE_ACK_SENT: 1543 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1544 /* fall through */ 1545 case STATE_CLOSED: 1546 case STATE_STOPPED: 1547 case STATE_CLOSING: 1548 case STATE_STOPPING: 1549 case STATE_REQ_SENT: 1550 sta: 1551 /* Send Terminate-Ack packet. */ 1552 if (debug) 1553 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1554 ifp->if_xname, cp->name); 1555 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1556 break; 1557 case STATE_OPENED: 1558 (cp->tld)(sp); 1559 sp->rst_counter[cp->protoidx] = 0; 1560 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1561 goto sta; 1562 default: 1563 printf("%s: %s illegal %s in state %s\n", 1564 ifp->if_xname, cp->name, 1565 sppp_cp_type_name(h->type), 1566 sppp_state_name(sp->state[cp->protoidx])); 1567 ++ifp->if_ierrors; 1568 } 1569 break; 1570 case TERM_ACK: 1571 switch (sp->state[cp->protoidx]) { 1572 case STATE_CLOSED: 1573 case STATE_STOPPED: 1574 case STATE_REQ_SENT: 1575 case STATE_ACK_SENT: 1576 break; 1577 case STATE_CLOSING: 1578 (cp->tlf)(sp); 1579 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1580 sppp_lcp_check_and_close(sp); 1581 break; 1582 case STATE_STOPPING: 1583 (cp->tlf)(sp); 1584 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1585 sppp_lcp_check_and_close(sp); 1586 break; 1587 case STATE_ACK_RCVD: 1588 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1589 break; 1590 case STATE_OPENED: 1591 (cp->tld)(sp); 1592 (cp->scr)(sp); 1593 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1594 break; 1595 default: 1596 printf("%s: %s illegal %s in state %s\n", 1597 ifp->if_xname, cp->name, 1598 sppp_cp_type_name(h->type), 1599 sppp_state_name(sp->state[cp->protoidx])); 1600 ++ifp->if_ierrors; 1601 } 1602 break; 1603 case CODE_REJ: 1604 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1605 log(LOG_INFO, 1606 "%s: %s: ignoring RXJ (%s) for code ?, " 1607 "danger will robinson\n", 1608 ifp->if_xname, cp->name, 1609 sppp_cp_type_name(h->type)); 1610 switch (sp->state[cp->protoidx]) { 1611 case STATE_CLOSED: 1612 case STATE_STOPPED: 1613 case STATE_REQ_SENT: 1614 case STATE_ACK_SENT: 1615 case STATE_CLOSING: 1616 case STATE_STOPPING: 1617 case STATE_OPENED: 1618 break; 1619 case STATE_ACK_RCVD: 1620 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1621 break; 1622 default: 1623 printf("%s: %s illegal %s in state %s\n", 1624 ifp->if_xname, cp->name, 1625 sppp_cp_type_name(h->type), 1626 sppp_state_name(sp->state[cp->protoidx])); 1627 ++ifp->if_ierrors; 1628 } 1629 break; 1630 case PROTO_REJ: 1631 { 1632 int catastrophic; 1633 const struct cp *upper; 1634 int i; 1635 u_int16_t proto; 1636 1637 catastrophic = 0; 1638 upper = NULL; 1639 proto = p[0] << 8 | p[1]; 1640 for (i = 0; i < IDX_COUNT; i++) { 1641 if (cps[i]->proto == proto) { 1642 upper = cps[i]; 1643 break; 1644 } 1645 } 1646 if (upper == NULL) 1647 catastrophic++; 1648 1649 if (debug) 1650 log(LOG_INFO, 1651 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1652 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1653 sppp_cp_type_name(h->type), proto, 1654 upper ? upper->name : "unknown", 1655 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1656 1657 /* 1658 * if we got RXJ+ against conf-req, the peer does not implement 1659 * this particular protocol type. terminate the protocol. 1660 */ 1661 if (upper && !catastrophic) { 1662 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1663 upper->Close(sp); 1664 break; 1665 } 1666 } 1667 1668 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1669 switch (sp->state[cp->protoidx]) { 1670 case STATE_CLOSED: 1671 case STATE_STOPPED: 1672 case STATE_REQ_SENT: 1673 case STATE_ACK_SENT: 1674 case STATE_CLOSING: 1675 case STATE_STOPPING: 1676 case STATE_OPENED: 1677 break; 1678 case STATE_ACK_RCVD: 1679 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1680 break; 1681 default: 1682 printf("%s: %s illegal %s in state %s\n", 1683 ifp->if_xname, cp->name, 1684 sppp_cp_type_name(h->type), 1685 sppp_state_name(sp->state[cp->protoidx])); 1686 ++ifp->if_ierrors; 1687 } 1688 break; 1689 } 1690 case DISC_REQ: 1691 if (cp->proto != PPP_LCP) 1692 goto illegal; 1693 /* Discard the packet. */ 1694 break; 1695 case ECHO_REQ: 1696 if (cp->proto != PPP_LCP) 1697 goto illegal; 1698 if (sp->state[cp->protoidx] != STATE_OPENED) { 1699 if (debug) 1700 addlog("%s: lcp echo req but lcp closed\n", 1701 ifp->if_xname); 1702 ++ifp->if_ierrors; 1703 break; 1704 } 1705 if (len < 8) { 1706 if (debug) 1707 addlog("%s: invalid lcp echo request " 1708 "packet length: %d bytes\n", 1709 ifp->if_xname, len); 1710 break; 1711 } 1712 memcpy(&u32, h + 1, sizeof u32); 1713 if (ntohl(u32) == sp->lcp.magic) { 1714 /* Line loopback mode detected. */ 1715 printf("%s: loopback\n", ifp->if_xname); 1716 if_down(ifp); 1717 IF_PURGE(&sp->pp_cpq); 1718 1719 /* Shut down the PPP link. */ 1720 /* XXX */ 1721 lcp.Down(sp); 1722 lcp.Up(sp); 1723 break; 1724 } 1725 u32 = htonl(sp->lcp.magic); 1726 memcpy(h + 1, &u32, sizeof u32); 1727 if (debug) 1728 addlog("%s: got lcp echo req, sending echo rep\n", 1729 ifp->if_xname); 1730 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1731 h + 1); 1732 break; 1733 case ECHO_REPLY: 1734 if (cp->proto != PPP_LCP) 1735 goto illegal; 1736 if (h->ident != sp->lcp.echoid) { 1737 ++ifp->if_ierrors; 1738 break; 1739 } 1740 if (len < 8) { 1741 if (debug) 1742 addlog("%s: lcp invalid echo reply " 1743 "packet length: %d bytes\n", 1744 ifp->if_xname, len); 1745 break; 1746 } 1747 if (debug) 1748 addlog("%s: lcp got echo rep\n", 1749 ifp->if_xname); 1750 memcpy(&u32, h + 1, sizeof u32); 1751 if (ntohl(u32) != sp->lcp.magic) 1752 sp->pp_alivecnt = 0; 1753 break; 1754 default: 1755 /* Unknown packet type -- send Code-Reject packet. */ 1756 illegal: 1757 if (debug) 1758 addlog("%s: %s send code-rej for 0x%x\n", 1759 ifp->if_xname, cp->name, h->type); 1760 sppp_cp_send(sp, cp->proto, CODE_REJ, 1761 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1762 ++ifp->if_ierrors; 1763 } 1764 } 1765 1766 1767 /* 1768 * The generic part of all Up/Down/Open/Close/TO event handlers. 1769 * Basically, the state transition handling in the automaton. 1770 */ 1771 static void 1772 sppp_up_event(const struct cp *cp, struct sppp *sp) 1773 { 1774 STDDCL; 1775 1776 if (debug) 1777 log(LOG_DEBUG, "%s: %s up(%s)\n", 1778 ifp->if_xname, cp->name, 1779 sppp_state_name(sp->state[cp->protoidx])); 1780 1781 switch (sp->state[cp->protoidx]) { 1782 case STATE_INITIAL: 1783 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1784 break; 1785 case STATE_STARTING: 1786 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1787 (cp->scr)(sp); 1788 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1789 break; 1790 default: 1791 printf("%s: %s illegal up in state %s\n", 1792 ifp->if_xname, cp->name, 1793 sppp_state_name(sp->state[cp->protoidx])); 1794 } 1795 } 1796 1797 static void 1798 sppp_down_event(const struct cp *cp, struct sppp *sp) 1799 { 1800 STDDCL; 1801 1802 if (debug) 1803 log(LOG_DEBUG, "%s: %s down(%s)\n", 1804 ifp->if_xname, cp->name, 1805 sppp_state_name(sp->state[cp->protoidx])); 1806 1807 switch (sp->state[cp->protoidx]) { 1808 case STATE_CLOSED: 1809 case STATE_CLOSING: 1810 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1811 break; 1812 case STATE_STOPPED: 1813 (cp->tls)(sp); 1814 /* fall through */ 1815 case STATE_STOPPING: 1816 case STATE_REQ_SENT: 1817 case STATE_ACK_RCVD: 1818 case STATE_ACK_SENT: 1819 sppp_cp_change_state(cp, sp, STATE_STARTING); 1820 break; 1821 case STATE_OPENED: 1822 (cp->tld)(sp); 1823 sppp_cp_change_state(cp, sp, STATE_STARTING); 1824 break; 1825 default: 1826 printf("%s: %s illegal down in state %s\n", 1827 ifp->if_xname, cp->name, 1828 sppp_state_name(sp->state[cp->protoidx])); 1829 } 1830 } 1831 1832 1833 static void 1834 sppp_open_event(const struct cp *cp, struct sppp *sp) 1835 { 1836 STDDCL; 1837 1838 if (debug) 1839 log(LOG_DEBUG, "%s: %s open(%s)\n", 1840 ifp->if_xname, cp->name, 1841 sppp_state_name(sp->state[cp->protoidx])); 1842 1843 switch (sp->state[cp->protoidx]) { 1844 case STATE_INITIAL: 1845 sppp_cp_change_state(cp, sp, STATE_STARTING); 1846 (cp->tls)(sp); 1847 break; 1848 case STATE_STARTING: 1849 break; 1850 case STATE_CLOSED: 1851 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1852 (cp->scr)(sp); 1853 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1854 break; 1855 case STATE_STOPPED: 1856 case STATE_STOPPING: 1857 case STATE_REQ_SENT: 1858 case STATE_ACK_RCVD: 1859 case STATE_ACK_SENT: 1860 case STATE_OPENED: 1861 break; 1862 case STATE_CLOSING: 1863 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1864 break; 1865 } 1866 } 1867 1868 1869 static void 1870 sppp_close_event(const struct cp *cp, struct sppp *sp) 1871 { 1872 STDDCL; 1873 1874 if (debug) 1875 log(LOG_DEBUG, "%s: %s close(%s)\n", 1876 ifp->if_xname, cp->name, 1877 sppp_state_name(sp->state[cp->protoidx])); 1878 1879 switch (sp->state[cp->protoidx]) { 1880 case STATE_INITIAL: 1881 case STATE_CLOSED: 1882 case STATE_CLOSING: 1883 break; 1884 case STATE_STARTING: 1885 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1886 (cp->tlf)(sp); 1887 break; 1888 case STATE_STOPPED: 1889 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1890 break; 1891 case STATE_STOPPING: 1892 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1893 break; 1894 case STATE_OPENED: 1895 (cp->tld)(sp); 1896 /* fall through */ 1897 case STATE_REQ_SENT: 1898 case STATE_ACK_RCVD: 1899 case STATE_ACK_SENT: 1900 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1901 sppp_cp_send(sp, cp->proto, TERM_REQ, 1902 ++sp->pp_seq[cp->protoidx], 0, 0); 1903 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1904 break; 1905 } 1906 } 1907 1908 static void 1909 sppp_to_event(const struct cp *cp, struct sppp *sp) 1910 { 1911 STDDCL; 1912 int s; 1913 1914 s = splnet(); 1915 if (debug) 1916 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1917 ifp->if_xname, cp->name, 1918 sppp_state_name(sp->state[cp->protoidx]), 1919 sp->rst_counter[cp->protoidx]); 1920 1921 if (--sp->rst_counter[cp->protoidx] < 0) 1922 /* TO- event */ 1923 switch (sp->state[cp->protoidx]) { 1924 case STATE_CLOSING: 1925 (cp->tlf)(sp); 1926 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1927 sppp_lcp_check_and_close(sp); 1928 break; 1929 case STATE_STOPPING: 1930 (cp->tlf)(sp); 1931 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1932 sppp_lcp_check_and_close(sp); 1933 break; 1934 case STATE_REQ_SENT: 1935 case STATE_ACK_RCVD: 1936 case STATE_ACK_SENT: 1937 (cp->tlf)(sp); 1938 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1939 sppp_lcp_check_and_close(sp); 1940 break; 1941 } 1942 else 1943 /* TO+ event */ 1944 switch (sp->state[cp->protoidx]) { 1945 case STATE_CLOSING: 1946 case STATE_STOPPING: 1947 sppp_cp_send(sp, cp->proto, TERM_REQ, 1948 ++sp->pp_seq[cp->protoidx], 0, 0); 1949 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1950 cp->TO, sp); 1951 break; 1952 case STATE_REQ_SENT: 1953 case STATE_ACK_RCVD: 1954 (cp->scr)(sp); 1955 /* sppp_cp_change_state() will restart the timer */ 1956 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1957 break; 1958 case STATE_ACK_SENT: 1959 (cp->scr)(sp); 1960 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1961 cp->TO, sp); 1962 break; 1963 } 1964 1965 splx(s); 1966 } 1967 1968 /* 1969 * Change the state of a control protocol in the state automaton. 1970 * Takes care of starting/stopping the restart timer. 1971 */ 1972 void 1973 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1974 { 1975 sp->state[cp->protoidx] = newstate; 1976 callout_stop(&sp->ch[cp->protoidx]); 1977 switch (newstate) { 1978 case STATE_INITIAL: 1979 case STATE_STARTING: 1980 case STATE_CLOSED: 1981 case STATE_STOPPED: 1982 case STATE_OPENED: 1983 break; 1984 case STATE_CLOSING: 1985 case STATE_STOPPING: 1986 case STATE_REQ_SENT: 1987 case STATE_ACK_RCVD: 1988 case STATE_ACK_SENT: 1989 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1990 cp->TO, sp); 1991 break; 1992 } 1993 } 1994 1995 /* 1996 *--------------------------------------------------------------------------* 1997 * * 1998 * The LCP implementation. * 1999 * * 2000 *--------------------------------------------------------------------------* 2001 */ 2002 static void 2003 sppp_lcp_init(struct sppp *sp) 2004 { 2005 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2006 sp->lcp.magic = 0; 2007 sp->state[IDX_LCP] = STATE_INITIAL; 2008 sp->fail_counter[IDX_LCP] = 0; 2009 sp->pp_seq[IDX_LCP] = 0; 2010 sp->pp_rseq[IDX_LCP] = 0; 2011 sp->lcp.protos = 0; 2012 if (sp->pp_if.if_mtu < PP_MTU) { 2013 sp->lcp.mru = sp->pp_if.if_mtu; 2014 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2015 } else 2016 sp->lcp.mru = PP_MTU; 2017 sp->lcp.their_mru = PP_MTU; 2018 2019 /* 2020 * Initialize counters and timeout values. Note that we don't 2021 * use the 3 seconds suggested in RFC 1661 since we are likely 2022 * running on a fast link. XXX We should probably implement 2023 * the exponential backoff option. Note that these values are 2024 * relevant for all control protocols, not just LCP only. 2025 */ 2026 sp->lcp.timeout = 1 * hz; 2027 sp->lcp.max_terminate = 2; 2028 sp->lcp.max_configure = 10; 2029 sp->lcp.max_failure = 10; 2030 callout_init(&sp->ch[IDX_LCP], 0); 2031 } 2032 2033 static void 2034 sppp_lcp_up(struct sppp *sp) 2035 { 2036 STDDCL; 2037 2038 /* Initialize activity timestamp: opening a connection is an activity */ 2039 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2040 2041 /* 2042 * If this interface is passive or dial-on-demand, and we are 2043 * still in Initial state, it means we've got an incoming 2044 * call. Activate the interface. 2045 */ 2046 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2047 if (debug) 2048 log(LOG_DEBUG, 2049 "%s: Up event", ifp->if_xname); 2050 ifp->if_flags |= IFF_RUNNING; 2051 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2052 if (debug) 2053 addlog("(incoming call)\n"); 2054 sp->pp_flags |= PP_CALLIN; 2055 lcp.Open(sp); 2056 } else if (debug) 2057 addlog("\n"); 2058 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2059 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2060 ifp->if_flags |= IFF_RUNNING; 2061 lcp.Open(sp); 2062 } 2063 2064 sppp_up_event(&lcp, sp); 2065 } 2066 2067 static void 2068 sppp_lcp_down(struct sppp *sp) 2069 { 2070 STDDCL; 2071 2072 sppp_down_event(&lcp, sp); 2073 2074 /* 2075 * If this is neither a dial-on-demand nor a passive 2076 * interface, simulate an ``ifconfig down'' action, so the 2077 * administrator can force a redial by another ``ifconfig 2078 * up''. XXX For leased line operation, should we immediately 2079 * try to reopen the connection here? 2080 */ 2081 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2082 if (debug) 2083 log(LOG_INFO, 2084 "%s: Down event (carrier loss), taking interface down.\n", 2085 ifp->if_xname); 2086 if_down(ifp); 2087 } else { 2088 if (debug) 2089 log(LOG_DEBUG, 2090 "%s: Down event (carrier loss)\n", 2091 ifp->if_xname); 2092 } 2093 sp->pp_flags &= ~PP_CALLIN; 2094 if (sp->state[IDX_LCP] != STATE_INITIAL) 2095 lcp.Close(sp); 2096 ifp->if_flags &= ~IFF_RUNNING; 2097 } 2098 2099 static void 2100 sppp_lcp_open(struct sppp *sp) 2101 { 2102 /* 2103 * If we are authenticator, negotiate LCP_AUTH 2104 */ 2105 if (sp->hisauth.proto != 0) 2106 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2107 else 2108 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2109 sp->pp_flags &= ~PP_NEEDAUTH; 2110 sppp_open_event(&lcp, sp); 2111 } 2112 2113 static void 2114 sppp_lcp_close(struct sppp *sp) 2115 { 2116 sppp_close_event(&lcp, sp); 2117 } 2118 2119 static void 2120 sppp_lcp_TO(void *cookie) 2121 { 2122 sppp_to_event(&lcp, (struct sppp *)cookie); 2123 } 2124 2125 /* 2126 * Analyze a configure request. Return true if it was agreeable, and 2127 * caused action sca, false if it has been rejected or nak'ed, and 2128 * caused action scn. (The return value is used to make the state 2129 * transition decision in the state automaton.) 2130 */ 2131 static int 2132 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2133 { 2134 STDDCL; 2135 u_char *buf, *r, *p; 2136 int origlen, rlen; 2137 u_int32_t nmagic; 2138 u_short authproto; 2139 2140 len -= 4; 2141 origlen = len; 2142 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2143 if (! buf) 2144 return (0); 2145 2146 if (debug) 2147 log(LOG_DEBUG, "%s: lcp parse opts:", 2148 ifp->if_xname); 2149 2150 /* pass 1: check for things that need to be rejected */ 2151 p = (void *)(h + 1); 2152 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2153 /* Sanity check option length */ 2154 if (p[1] > len) { 2155 /* 2156 * Malicious option - drop immediately. 2157 * XXX Maybe we should just RXJ it? 2158 */ 2159 addlog("%s: received malicious LCP option 0x%02x, " 2160 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2161 p[0], p[1], len); 2162 goto drop; 2163 } 2164 if (debug) 2165 addlog(" %s", sppp_lcp_opt_name(*p)); 2166 switch (*p) { 2167 case LCP_OPT_MAGIC: 2168 /* Magic number. */ 2169 /* fall through, both are same length */ 2170 case LCP_OPT_ASYNC_MAP: 2171 /* Async control character map. */ 2172 if (len >= 6 || p[1] == 6) 2173 continue; 2174 if (debug) 2175 addlog(" [invalid]"); 2176 break; 2177 case LCP_OPT_MRU: 2178 /* Maximum receive unit. */ 2179 if (len >= 4 && p[1] == 4) 2180 continue; 2181 if (debug) 2182 addlog(" [invalid]"); 2183 break; 2184 case LCP_OPT_AUTH_PROTO: 2185 if (len < 4) { 2186 if (debug) 2187 addlog(" [invalid]"); 2188 break; 2189 } 2190 authproto = (p[2] << 8) + p[3]; 2191 if (authproto == PPP_CHAP && p[1] != 5) { 2192 if (debug) 2193 addlog(" [invalid chap len]"); 2194 break; 2195 } 2196 if (sp->myauth.proto == 0) { 2197 /* we are not configured to do auth */ 2198 if (debug) 2199 addlog(" [not configured]"); 2200 break; 2201 } 2202 /* 2203 * Remote want us to authenticate, remember this, 2204 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2205 * up. 2206 */ 2207 sp->pp_flags |= PP_NEEDAUTH; 2208 continue; 2209 default: 2210 /* Others not supported. */ 2211 if (debug) 2212 addlog(" [rej]"); 2213 break; 2214 } 2215 /* Add the option to rejected list. */ 2216 bcopy (p, r, p[1]); 2217 r += p[1]; 2218 rlen += p[1]; 2219 } 2220 if (rlen) { 2221 if (debug) 2222 addlog(" send conf-rej\n"); 2223 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2224 goto end; 2225 } else if (debug) 2226 addlog("\n"); 2227 2228 /* 2229 * pass 2: check for option values that are unacceptable and 2230 * thus require to be nak'ed. 2231 */ 2232 if (debug) 2233 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2234 ifp->if_xname); 2235 2236 p = (void *)(h + 1); 2237 len = origlen; 2238 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2239 if (debug) 2240 addlog(" %s", sppp_lcp_opt_name(*p)); 2241 switch (*p) { 2242 case LCP_OPT_MAGIC: 2243 /* Magic number -- extract. */ 2244 nmagic = (u_int32_t)p[2] << 24 | 2245 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2246 if (nmagic != sp->lcp.magic) { 2247 if (debug) 2248 addlog(" 0x%x", nmagic); 2249 continue; 2250 } 2251 /* 2252 * Local and remote magics equal -- loopback? 2253 */ 2254 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2255 printf ("%s: loopback\n", 2256 ifp->if_xname); 2257 sp->pp_loopcnt = 0; 2258 if (ifp->if_flags & IFF_UP) { 2259 if_down(ifp); 2260 IF_PURGE(&sp->pp_cpq); 2261 /* XXX ? */ 2262 lcp.Down(sp); 2263 lcp.Up(sp); 2264 } 2265 } else if (debug) 2266 addlog(" [glitch]"); 2267 ++sp->pp_loopcnt; 2268 /* 2269 * We negate our magic here, and NAK it. If 2270 * we see it later in an NAK packet, we 2271 * suggest a new one. 2272 */ 2273 nmagic = ~sp->lcp.magic; 2274 /* Gonna NAK it. */ 2275 p[2] = nmagic >> 24; 2276 p[3] = nmagic >> 16; 2277 p[4] = nmagic >> 8; 2278 p[5] = nmagic; 2279 break; 2280 2281 case LCP_OPT_ASYNC_MAP: 2282 /* 2283 * Async control character map -- just ignore it. 2284 * 2285 * Quote from RFC 1662, chapter 6: 2286 * To enable this functionality, synchronous PPP 2287 * implementations MUST always respond to the 2288 * Async-Control-Character-Map Configuration 2289 * Option with the LCP Configure-Ack. However, 2290 * acceptance of the Configuration Option does 2291 * not imply that the synchronous implementation 2292 * will do any ACCM mapping. Instead, all such 2293 * octet mapping will be performed by the 2294 * asynchronous-to-synchronous converter. 2295 */ 2296 continue; 2297 2298 case LCP_OPT_MRU: 2299 /* 2300 * Maximum receive unit. Always agreeable, 2301 * but ignored by now. 2302 */ 2303 sp->lcp.their_mru = p[2] * 256 + p[3]; 2304 if (debug) 2305 addlog(" %ld", sp->lcp.their_mru); 2306 continue; 2307 2308 case LCP_OPT_AUTH_PROTO: 2309 authproto = (p[2] << 8) + p[3]; 2310 if (sp->myauth.proto != authproto) { 2311 /* not agreed, nak */ 2312 if (debug) 2313 addlog(" [mine %s != his %s]", 2314 sppp_proto_name(sp->myauth.proto), 2315 sppp_proto_name(authproto)); 2316 p[2] = sp->myauth.proto >> 8; 2317 p[3] = sp->myauth.proto; 2318 break; 2319 } 2320 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2321 if (debug) 2322 addlog(" [chap not MD5]"); 2323 p[4] = CHAP_MD5; 2324 break; 2325 } 2326 continue; 2327 } 2328 /* Add the option to nak'ed list. */ 2329 bcopy (p, r, p[1]); 2330 r += p[1]; 2331 rlen += p[1]; 2332 } 2333 if (rlen) { 2334 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2335 if (debug) 2336 addlog(" max_failure (%d) exceeded, " 2337 "send conf-rej\n", 2338 sp->lcp.max_failure); 2339 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2340 } else { 2341 if (debug) 2342 addlog(" send conf-nak\n"); 2343 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2344 } 2345 goto end; 2346 } else { 2347 if (debug) 2348 addlog(" send conf-ack\n"); 2349 sp->fail_counter[IDX_LCP] = 0; 2350 sp->pp_loopcnt = 0; 2351 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2352 } 2353 2354 end: 2355 free(buf, M_TEMP); 2356 return (rlen == 0); 2357 2358 drop: 2359 free(buf, M_TEMP); 2360 return -1; 2361 } 2362 2363 /* 2364 * Analyze the LCP Configure-Reject option list, and adjust our 2365 * negotiation. 2366 */ 2367 static void 2368 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2369 { 2370 STDDCL; 2371 u_char *buf, *p; 2372 2373 len -= 4; 2374 buf = malloc (len, M_TEMP, M_NOWAIT); 2375 if (!buf) 2376 return; 2377 2378 if (debug) 2379 log(LOG_DEBUG, "%s: lcp rej opts:", 2380 ifp->if_xname); 2381 2382 p = (void *)(h + 1); 2383 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2384 /* Sanity check option length */ 2385 if (p[1] > len) { 2386 /* 2387 * Malicious option - drop immediately. 2388 * XXX Maybe we should just RXJ it? 2389 */ 2390 addlog("%s: received malicious LCP option, " 2391 "dropping.\n", ifp->if_xname); 2392 goto drop; 2393 } 2394 if (debug) 2395 addlog(" %s", sppp_lcp_opt_name(*p)); 2396 switch (*p) { 2397 case LCP_OPT_MAGIC: 2398 /* Magic number -- can't use it, use 0 */ 2399 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2400 sp->lcp.magic = 0; 2401 break; 2402 case LCP_OPT_MRU: 2403 /* 2404 * We try to negotiate a lower MRU if the underlying 2405 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2406 * peer rejects this lower rate, fallback to the 2407 * default. 2408 */ 2409 if (debug) { 2410 addlog("%s: warning: peer rejected our MRU of " 2411 "%ld bytes. Defaulting to %d bytes\n", 2412 ifp->if_xname, sp->lcp.mru, PP_MTU); 2413 } 2414 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2415 sp->lcp.mru = PP_MTU; 2416 break; 2417 case LCP_OPT_AUTH_PROTO: 2418 /* 2419 * Peer doesn't want to authenticate himself, 2420 * deny unless this is a dialout call, and 2421 * SPPP_AUTHFLAG_NOCALLOUT is set. 2422 */ 2423 if ((sp->pp_flags & PP_CALLIN) == 0 && 2424 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2425 if (debug) 2426 addlog(" [don't insist on auth " 2427 "for callout]"); 2428 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2429 break; 2430 } 2431 if (debug) 2432 addlog("[access denied]\n"); 2433 lcp.Close(sp); 2434 break; 2435 } 2436 } 2437 if (debug) 2438 addlog("\n"); 2439 drop: 2440 free(buf, M_TEMP); 2441 return; 2442 } 2443 2444 /* 2445 * Analyze the LCP Configure-NAK option list, and adjust our 2446 * negotiation. 2447 */ 2448 static void 2449 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2450 { 2451 STDDCL; 2452 u_char *buf, *p; 2453 u_int32_t magic; 2454 2455 len -= 4; 2456 buf = malloc (len, M_TEMP, M_NOWAIT); 2457 if (!buf) 2458 return; 2459 2460 if (debug) 2461 log(LOG_DEBUG, "%s: lcp nak opts:", 2462 ifp->if_xname); 2463 2464 p = (void *)(h + 1); 2465 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2466 /* Sanity check option length */ 2467 if (p[1] > len) { 2468 /* 2469 * Malicious option - drop immediately. 2470 * XXX Maybe we should just RXJ it? 2471 */ 2472 addlog("%s: received malicious LCP option, " 2473 "dropping.\n", ifp->if_xname); 2474 goto drop; 2475 } 2476 if (debug) 2477 addlog(" %s", sppp_lcp_opt_name(*p)); 2478 switch (*p) { 2479 case LCP_OPT_MAGIC: 2480 /* Magic number -- renegotiate */ 2481 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2482 len >= 6 && p[1] == 6) { 2483 magic = (u_int32_t)p[2] << 24 | 2484 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2485 /* 2486 * If the remote magic is our negated one, 2487 * this looks like a loopback problem. 2488 * Suggest a new magic to make sure. 2489 */ 2490 if (magic == ~sp->lcp.magic) { 2491 if (debug) 2492 addlog(" magic glitch"); 2493 sp->lcp.magic = arc4random(); 2494 } else { 2495 sp->lcp.magic = magic; 2496 if (debug) 2497 addlog(" %d", magic); 2498 } 2499 } 2500 break; 2501 case LCP_OPT_MRU: 2502 /* 2503 * Peer wants to advise us to negotiate an MRU. 2504 * Agree on it if it's reasonable, or use 2505 * default otherwise. 2506 */ 2507 if (len >= 4 && p[1] == 4) { 2508 u_int mru = p[2] * 256 + p[3]; 2509 if (debug) 2510 addlog(" %d", mru); 2511 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2512 mru = sp->pp_if.if_mtu; 2513 sp->lcp.mru = mru; 2514 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2515 } 2516 break; 2517 case LCP_OPT_AUTH_PROTO: 2518 /* 2519 * Peer doesn't like our authentication method, 2520 * deny. 2521 */ 2522 if (debug) 2523 addlog("[access denied]\n"); 2524 lcp.Close(sp); 2525 break; 2526 } 2527 } 2528 if (debug) 2529 addlog("\n"); 2530 drop: 2531 free(buf, M_TEMP); 2532 return; 2533 } 2534 2535 static void 2536 sppp_lcp_tlu(struct sppp *sp) 2537 { 2538 STDDCL; 2539 int i; 2540 u_int32_t mask; 2541 2542 /* XXX ? */ 2543 if (! (ifp->if_flags & IFF_UP) && 2544 (ifp->if_flags & IFF_RUNNING)) { 2545 /* Coming out of loopback mode. */ 2546 if_up(ifp); 2547 } 2548 2549 for (i = 0; i < IDX_COUNT; i++) 2550 if ((cps[i])->flags & CP_QUAL) 2551 (cps[i])->Open(sp); 2552 2553 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2554 (sp->pp_flags & PP_NEEDAUTH) != 0) 2555 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2556 else 2557 sp->pp_phase = SPPP_PHASE_NETWORK; 2558 2559 if (debug) 2560 { 2561 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2562 sppp_phase_name(sp->pp_phase)); 2563 } 2564 2565 /* 2566 * Open all authentication protocols. This is even required 2567 * if we already proceeded to network phase, since it might be 2568 * that remote wants us to authenticate, so we might have to 2569 * send a PAP request. Undesired authentication protocols 2570 * don't do anything when they get an Open event. 2571 */ 2572 for (i = 0; i < IDX_COUNT; i++) 2573 if ((cps[i])->flags & CP_AUTH) 2574 (cps[i])->Open(sp); 2575 2576 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2577 /* Notify all NCPs. */ 2578 for (i = 0; i < IDX_COUNT; i++) 2579 if ((cps[i])->flags & CP_NCP) 2580 (cps[i])->Open(sp); 2581 } 2582 2583 /* Send Up events to all started protos. */ 2584 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2585 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2586 (cps[i])->Up(sp); 2587 2588 /* notify low-level driver of state change */ 2589 if (sp->pp_chg) 2590 sp->pp_chg(sp, (int)sp->pp_phase); 2591 2592 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2593 /* if no NCP is starting, close down */ 2594 sppp_lcp_check_and_close(sp); 2595 } 2596 2597 static void 2598 sppp_lcp_tld(struct sppp *sp) 2599 { 2600 STDDCL; 2601 int i; 2602 u_int32_t mask; 2603 2604 sp->pp_phase = SPPP_PHASE_TERMINATE; 2605 2606 if (debug) 2607 { 2608 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2609 sppp_phase_name(sp->pp_phase)); 2610 } 2611 2612 /* 2613 * Take upper layers down. We send the Down event first and 2614 * the Close second to prevent the upper layers from sending 2615 * ``a flurry of terminate-request packets'', as the RFC 2616 * describes it. 2617 */ 2618 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2619 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2620 (cps[i])->Down(sp); 2621 (cps[i])->Close(sp); 2622 } 2623 } 2624 2625 static void 2626 sppp_lcp_tls(struct sppp *sp) 2627 { 2628 STDDCL; 2629 2630 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2631 printf("%s: authentication failed %d times, not retrying again\n", 2632 sp->pp_if.if_xname, sp->pp_auth_failures); 2633 if_down(&sp->pp_if); 2634 return; 2635 } 2636 2637 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2638 2639 if (debug) 2640 { 2641 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2642 sppp_phase_name(sp->pp_phase)); 2643 } 2644 2645 /* Notify lower layer if desired. */ 2646 if (sp->pp_tls) 2647 (sp->pp_tls)(sp); 2648 } 2649 2650 static void 2651 sppp_lcp_tlf(struct sppp *sp) 2652 { 2653 STDDCL; 2654 2655 sp->pp_phase = SPPP_PHASE_DEAD; 2656 2657 if (debug) 2658 { 2659 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2660 sppp_phase_name(sp->pp_phase)); 2661 } 2662 2663 /* Notify lower layer if desired. */ 2664 if (sp->pp_tlf) 2665 (sp->pp_tlf)(sp); 2666 } 2667 2668 static void 2669 sppp_lcp_scr(struct sppp *sp) 2670 { 2671 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2672 int i = 0; 2673 u_short authproto; 2674 2675 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2676 if (! sp->lcp.magic) 2677 sp->lcp.magic = arc4random(); 2678 opt[i++] = LCP_OPT_MAGIC; 2679 opt[i++] = 6; 2680 opt[i++] = sp->lcp.magic >> 24; 2681 opt[i++] = sp->lcp.magic >> 16; 2682 opt[i++] = sp->lcp.magic >> 8; 2683 opt[i++] = sp->lcp.magic; 2684 } 2685 2686 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2687 opt[i++] = LCP_OPT_MRU; 2688 opt[i++] = 4; 2689 opt[i++] = sp->lcp.mru >> 8; 2690 opt[i++] = sp->lcp.mru; 2691 } 2692 2693 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2694 authproto = sp->hisauth.proto; 2695 opt[i++] = LCP_OPT_AUTH_PROTO; 2696 opt[i++] = authproto == PPP_CHAP? 5: 4; 2697 opt[i++] = authproto >> 8; 2698 opt[i++] = authproto; 2699 if (authproto == PPP_CHAP) 2700 opt[i++] = CHAP_MD5; 2701 } 2702 2703 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2704 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2705 } 2706 2707 /* 2708 * Check the open NCPs, return true if at least one NCP is open. 2709 */ 2710 static int 2711 sppp_ncp_check(struct sppp *sp) 2712 { 2713 int i, mask; 2714 2715 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2716 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2717 return 1; 2718 return 0; 2719 } 2720 2721 /* 2722 * Re-check the open NCPs and see if we should terminate the link. 2723 * Called by the NCPs during their tlf action handling. 2724 */ 2725 static void 2726 sppp_lcp_check_and_close(struct sppp *sp) 2727 { 2728 2729 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2730 /* don't bother, we are already going down */ 2731 return; 2732 2733 if (sppp_ncp_check(sp)) 2734 return; 2735 2736 lcp.Close(sp); 2737 } 2738 2739 2740 /* 2741 *--------------------------------------------------------------------------* 2742 * * 2743 * The IPCP implementation. * 2744 * * 2745 *--------------------------------------------------------------------------* 2746 */ 2747 2748 static void 2749 sppp_ipcp_init(struct sppp *sp) 2750 { 2751 sp->ipcp.opts = 0; 2752 sp->ipcp.flags = 0; 2753 sp->state[IDX_IPCP] = STATE_INITIAL; 2754 sp->fail_counter[IDX_IPCP] = 0; 2755 sp->pp_seq[IDX_IPCP] = 0; 2756 sp->pp_rseq[IDX_IPCP] = 0; 2757 callout_init(&sp->ch[IDX_IPCP], 0); 2758 } 2759 2760 static void 2761 sppp_ipcp_up(struct sppp *sp) 2762 { 2763 sppp_up_event(&ipcp, sp); 2764 } 2765 2766 static void 2767 sppp_ipcp_down(struct sppp *sp) 2768 { 2769 sppp_down_event(&ipcp, sp); 2770 } 2771 2772 static void 2773 sppp_ipcp_open(struct sppp *sp) 2774 { 2775 STDDCL; 2776 u_int32_t myaddr, hisaddr; 2777 2778 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2779 sp->ipcp.req_myaddr = 0; 2780 sp->ipcp.req_hisaddr = 0; 2781 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2782 2783 #ifdef INET 2784 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2785 #else 2786 myaddr = hisaddr = 0; 2787 #endif 2788 /* 2789 * If we don't have his address, this probably means our 2790 * interface doesn't want to talk IP at all. (This could 2791 * be the case if somebody wants to speak only IPX, for 2792 * example.) Don't open IPCP in this case. 2793 */ 2794 if (hisaddr == 0) { 2795 /* XXX this message should go away */ 2796 if (debug) 2797 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2798 ifp->if_xname); 2799 return; 2800 } 2801 2802 if (myaddr == 0) { 2803 /* 2804 * I don't have an assigned address, so i need to 2805 * negotiate my address. 2806 */ 2807 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2808 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2809 } 2810 if (hisaddr == 1) { 2811 /* 2812 * XXX - remove this hack! 2813 * remote has no valid address, we need to get one assigned. 2814 */ 2815 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2816 } 2817 sppp_open_event(&ipcp, sp); 2818 } 2819 2820 static void 2821 sppp_ipcp_close(struct sppp *sp) 2822 { 2823 STDDCL; 2824 2825 sppp_close_event(&ipcp, sp); 2826 #ifdef INET 2827 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2828 /* 2829 * Some address was dynamic, clear it again. 2830 */ 2831 sppp_clear_ip_addrs(sp); 2832 #endif 2833 2834 if (sp->pp_saved_mtu > 0) { 2835 ifp->if_mtu = sp->pp_saved_mtu; 2836 sp->pp_saved_mtu = 0; 2837 if (debug) 2838 log(LOG_DEBUG, 2839 "%s: resetting MTU to %" PRIu64 " bytes\n", 2840 ifp->if_xname, ifp->if_mtu); 2841 } 2842 } 2843 2844 static void 2845 sppp_ipcp_TO(void *cookie) 2846 { 2847 sppp_to_event(&ipcp, (struct sppp *)cookie); 2848 } 2849 2850 /* 2851 * Analyze a configure request. Return true if it was agreeable, and 2852 * caused action sca, false if it has been rejected or nak'ed, and 2853 * caused action scn. (The return value is used to make the state 2854 * transition decision in the state automaton.) 2855 */ 2856 static int 2857 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2858 { 2859 u_char *buf, *r, *p; 2860 struct ifnet *ifp = &sp->pp_if; 2861 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2862 u_int32_t hisaddr, desiredaddr; 2863 2864 len -= 4; 2865 origlen = len; 2866 /* 2867 * Make sure to allocate a buf that can at least hold a 2868 * conf-nak with an `address' option. We might need it below. 2869 */ 2870 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2871 if (! buf) 2872 return (0); 2873 2874 /* pass 1: see if we can recognize them */ 2875 if (debug) 2876 log(LOG_DEBUG, "%s: ipcp parse opts:", 2877 ifp->if_xname); 2878 p = (void *)(h + 1); 2879 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2880 /* Sanity check option length */ 2881 if (p[1] > len) { 2882 /* XXX should we just RXJ? */ 2883 addlog("%s: malicious IPCP option received, dropping\n", 2884 ifp->if_xname); 2885 goto drop; 2886 } 2887 if (debug) 2888 addlog(" %s", sppp_ipcp_opt_name(*p)); 2889 switch (*p) { 2890 #ifdef notyet 2891 case IPCP_OPT_COMPRESSION: 2892 if (len >= 6 && p[1] >= 6) { 2893 /* correctly formed compress option */ 2894 continue; 2895 } 2896 if (debug) 2897 addlog(" [invalid]"); 2898 break; 2899 #endif 2900 case IPCP_OPT_ADDRESS: 2901 if (len >= 6 && p[1] == 6) { 2902 /* correctly formed address option */ 2903 continue; 2904 } 2905 if (debug) 2906 addlog(" [invalid]"); 2907 break; 2908 default: 2909 /* Others not supported. */ 2910 if (debug) 2911 addlog(" [rej]"); 2912 break; 2913 } 2914 /* Add the option to rejected list. */ 2915 bcopy (p, r, p[1]); 2916 r += p[1]; 2917 rlen += p[1]; 2918 } 2919 if (rlen) { 2920 if (debug) 2921 addlog(" send conf-rej\n"); 2922 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2923 goto end; 2924 } else if (debug) 2925 addlog("\n"); 2926 2927 /* pass 2: parse option values */ 2928 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2929 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2930 else 2931 #ifdef INET 2932 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2933 #else 2934 hisaddr = 0; 2935 #endif 2936 if (debug) 2937 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2938 ifp->if_xname); 2939 p = (void *)(h + 1); 2940 len = origlen; 2941 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2942 if (debug) 2943 addlog(" %s", sppp_ipcp_opt_name(*p)); 2944 switch (*p) { 2945 #ifdef notyet 2946 case IPCP_OPT_COMPRESSION: 2947 continue; 2948 #endif 2949 case IPCP_OPT_ADDRESS: 2950 desiredaddr = p[2] << 24 | p[3] << 16 | 2951 p[4] << 8 | p[5]; 2952 if (desiredaddr == hisaddr || 2953 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2954 /* 2955 * Peer's address is same as our value, 2956 * this is agreeable. Gonna conf-ack 2957 * it. 2958 */ 2959 if (debug) 2960 addlog(" %s [ack]", 2961 sppp_dotted_quad(hisaddr)); 2962 /* record that we've seen it already */ 2963 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2964 sp->ipcp.req_hisaddr = desiredaddr; 2965 hisaddr = desiredaddr; 2966 continue; 2967 } 2968 /* 2969 * The address wasn't agreeable. This is either 2970 * he sent us 0.0.0.0, asking to assign him an 2971 * address, or he send us another address not 2972 * matching our value. Either case, we gonna 2973 * conf-nak it with our value. 2974 */ 2975 if (debug) { 2976 if (desiredaddr == 0) 2977 addlog(" [addr requested]"); 2978 else 2979 addlog(" %s [not agreed]", 2980 sppp_dotted_quad(desiredaddr)); 2981 } 2982 2983 p[2] = hisaddr >> 24; 2984 p[3] = hisaddr >> 16; 2985 p[4] = hisaddr >> 8; 2986 p[5] = hisaddr; 2987 break; 2988 } 2989 /* Add the option to nak'ed list. */ 2990 bcopy (p, r, p[1]); 2991 r += p[1]; 2992 rlen += p[1]; 2993 } 2994 2995 /* 2996 * If we are about to conf-ack the request, but haven't seen 2997 * his address so far, gonna conf-nak it instead, with the 2998 * `address' option present and our idea of his address being 2999 * filled in there, to request negotiation of both addresses. 3000 * 3001 * XXX This can result in an endless req - nak loop if peer 3002 * doesn't want to send us his address. Q: What should we do 3003 * about it? XXX A: implement the max-failure counter. 3004 */ 3005 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 3006 buf[0] = IPCP_OPT_ADDRESS; 3007 buf[1] = 6; 3008 buf[2] = hisaddr >> 24; 3009 buf[3] = hisaddr >> 16; 3010 buf[4] = hisaddr >> 8; 3011 buf[5] = hisaddr; 3012 rlen = 6; 3013 if (debug) 3014 addlog(" still need hisaddr"); 3015 } 3016 3017 if (rlen) { 3018 if (debug) 3019 addlog(" send conf-nak\n"); 3020 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3021 } else { 3022 if (debug) 3023 addlog(" send conf-ack\n"); 3024 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3025 } 3026 3027 end: 3028 free(buf, M_TEMP); 3029 return (rlen == 0); 3030 3031 drop: 3032 free(buf, M_TEMP); 3033 return -1; 3034 } 3035 3036 /* 3037 * Analyze the IPCP Configure-Reject option list, and adjust our 3038 * negotiation. 3039 */ 3040 static void 3041 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3042 { 3043 u_char *buf, *p; 3044 struct ifnet *ifp = &sp->pp_if; 3045 int debug = ifp->if_flags & IFF_DEBUG; 3046 3047 len -= 4; 3048 buf = malloc (len, M_TEMP, M_NOWAIT); 3049 if (!buf) 3050 return; 3051 3052 if (debug) 3053 log(LOG_DEBUG, "%s: ipcp rej opts:", 3054 ifp->if_xname); 3055 3056 p = (void *)(h + 1); 3057 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3058 /* Sanity check option length */ 3059 if (p[1] > len) { 3060 /* XXX should we just RXJ? */ 3061 addlog("%s: malicious IPCP option received, dropping\n", 3062 ifp->if_xname); 3063 goto drop; 3064 } 3065 if (debug) 3066 addlog(" %s", sppp_ipcp_opt_name(*p)); 3067 switch (*p) { 3068 case IPCP_OPT_ADDRESS: 3069 /* 3070 * Peer doesn't grok address option. This is 3071 * bad. XXX Should we better give up here? 3072 */ 3073 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3074 break; 3075 #ifdef notyet 3076 case IPCP_OPT_COMPRESS: 3077 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3078 break; 3079 #endif 3080 } 3081 } 3082 if (debug) 3083 addlog("\n"); 3084 drop: 3085 free(buf, M_TEMP); 3086 return; 3087 } 3088 3089 /* 3090 * Analyze the IPCP Configure-NAK option list, and adjust our 3091 * negotiation. 3092 */ 3093 static void 3094 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3095 { 3096 u_char *p; 3097 struct ifnet *ifp = &sp->pp_if; 3098 int debug = ifp->if_flags & IFF_DEBUG; 3099 u_int32_t wantaddr; 3100 3101 len -= 4; 3102 3103 if (debug) 3104 log(LOG_DEBUG, "%s: ipcp nak opts:", 3105 ifp->if_xname); 3106 3107 p = (void *)(h + 1); 3108 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3109 /* Sanity check option length */ 3110 if (p[1] > len) { 3111 /* XXX should we just RXJ? */ 3112 addlog("%s: malicious IPCP option received, dropping\n", 3113 ifp->if_xname); 3114 return; 3115 } 3116 if (debug) 3117 addlog(" %s", sppp_ipcp_opt_name(*p)); 3118 switch (*p) { 3119 case IPCP_OPT_ADDRESS: 3120 /* 3121 * Peer doesn't like our local IP address. See 3122 * if we can do something for him. We'll drop 3123 * him our address then. 3124 */ 3125 if (len >= 6 && p[1] == 6) { 3126 wantaddr = p[2] << 24 | p[3] << 16 | 3127 p[4] << 8 | p[5]; 3128 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3129 if (debug) 3130 addlog(" [wantaddr %s]", 3131 sppp_dotted_quad(wantaddr)); 3132 /* 3133 * When doing dynamic address assignment, 3134 * we accept his offer. Otherwise, we 3135 * ignore it and thus continue to negotiate 3136 * our already existing value. 3137 */ 3138 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3139 if (debug) 3140 addlog(" [agree]"); 3141 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3142 sp->ipcp.req_myaddr = wantaddr; 3143 } 3144 } 3145 break; 3146 3147 case IPCP_OPT_PRIMDNS: 3148 if (len >= 6 && p[1] == 6) { 3149 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3150 p[4] << 8 | p[5]; 3151 } 3152 break; 3153 3154 case IPCP_OPT_SECDNS: 3155 if (len >= 6 && p[1] == 6) { 3156 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3157 p[4] << 8 | p[5]; 3158 } 3159 break; 3160 #ifdef notyet 3161 case IPCP_OPT_COMPRESS: 3162 /* 3163 * Peer wants different compression parameters. 3164 */ 3165 break; 3166 #endif 3167 } 3168 } 3169 if (debug) 3170 addlog("\n"); 3171 } 3172 3173 static void 3174 sppp_ipcp_tlu(struct sppp *sp) 3175 { 3176 #ifdef INET 3177 /* we are up. Set addresses and notify anyone interested */ 3178 STDDCL; 3179 u_int32_t myaddr, hisaddr; 3180 3181 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3182 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3183 myaddr = sp->ipcp.req_myaddr; 3184 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3185 hisaddr = sp->ipcp.req_hisaddr; 3186 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3187 3188 if (ifp->if_mtu > sp->lcp.their_mru) { 3189 sp->pp_saved_mtu = ifp->if_mtu; 3190 ifp->if_mtu = sp->lcp.their_mru; 3191 if (debug) 3192 log(LOG_DEBUG, 3193 "%s: setting MTU to %" PRIu64 " bytes\n", 3194 ifp->if_xname, ifp->if_mtu); 3195 } 3196 3197 if (sp->pp_con) 3198 sp->pp_con(sp); 3199 #endif 3200 } 3201 3202 static void 3203 sppp_ipcp_tld(struct sppp *sp) 3204 { 3205 } 3206 3207 static void 3208 sppp_ipcp_tls(struct sppp *sp) 3209 { 3210 /* indicate to LCP that it must stay alive */ 3211 sp->lcp.protos |= (1 << IDX_IPCP); 3212 } 3213 3214 static void 3215 sppp_ipcp_tlf(struct sppp *sp) 3216 { 3217 /* we no longer need LCP */ 3218 sp->lcp.protos &= ~(1 << IDX_IPCP); 3219 } 3220 3221 static void 3222 sppp_ipcp_scr(struct sppp *sp) 3223 { 3224 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3225 #ifdef INET 3226 u_int32_t ouraddr; 3227 #endif 3228 int i = 0; 3229 3230 #ifdef notyet 3231 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3232 opt[i++] = IPCP_OPT_COMPRESSION; 3233 opt[i++] = 6; 3234 opt[i++] = 0; /* VJ header compression */ 3235 opt[i++] = 0x2d; /* VJ header compression */ 3236 opt[i++] = max_slot_id; 3237 opt[i++] = comp_slot_id; 3238 } 3239 #endif 3240 3241 #ifdef INET 3242 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3243 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3244 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3245 else 3246 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3247 opt[i++] = IPCP_OPT_ADDRESS; 3248 opt[i++] = 6; 3249 opt[i++] = ouraddr >> 24; 3250 opt[i++] = ouraddr >> 16; 3251 opt[i++] = ouraddr >> 8; 3252 opt[i++] = ouraddr; 3253 } 3254 #endif 3255 3256 if (sp->query_dns & 1) { 3257 opt[i++] = IPCP_OPT_PRIMDNS; 3258 opt[i++] = 6; 3259 opt[i++] = sp->dns_addrs[0] >> 24; 3260 opt[i++] = sp->dns_addrs[0] >> 16; 3261 opt[i++] = sp->dns_addrs[0] >> 8; 3262 opt[i++] = sp->dns_addrs[0]; 3263 } 3264 if (sp->query_dns & 2) { 3265 opt[i++] = IPCP_OPT_SECDNS; 3266 opt[i++] = 6; 3267 opt[i++] = sp->dns_addrs[1] >> 24; 3268 opt[i++] = sp->dns_addrs[1] >> 16; 3269 opt[i++] = sp->dns_addrs[1] >> 8; 3270 opt[i++] = sp->dns_addrs[1]; 3271 } 3272 3273 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3274 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3275 } 3276 3277 3278 /* 3279 *--------------------------------------------------------------------------* 3280 * * 3281 * The IPv6CP implementation. * 3282 * * 3283 *--------------------------------------------------------------------------* 3284 */ 3285 3286 #ifdef INET6 3287 static void 3288 sppp_ipv6cp_init(struct sppp *sp) 3289 { 3290 sp->ipv6cp.opts = 0; 3291 sp->ipv6cp.flags = 0; 3292 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3293 sp->fail_counter[IDX_IPV6CP] = 0; 3294 sp->pp_seq[IDX_IPV6CP] = 0; 3295 sp->pp_rseq[IDX_IPV6CP] = 0; 3296 callout_init(&sp->ch[IDX_IPV6CP], 0); 3297 } 3298 3299 static void 3300 sppp_ipv6cp_up(struct sppp *sp) 3301 { 3302 sppp_up_event(&ipv6cp, sp); 3303 } 3304 3305 static void 3306 sppp_ipv6cp_down(struct sppp *sp) 3307 { 3308 sppp_down_event(&ipv6cp, sp); 3309 } 3310 3311 static void 3312 sppp_ipv6cp_open(struct sppp *sp) 3313 { 3314 STDDCL; 3315 struct in6_addr myaddr, hisaddr; 3316 3317 #ifdef IPV6CP_MYIFID_DYN 3318 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3319 #else 3320 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3321 #endif 3322 3323 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3324 /* 3325 * If we don't have our address, this probably means our 3326 * interface doesn't want to talk IPv6 at all. (This could 3327 * be the case if somebody wants to speak only IPX, for 3328 * example.) Don't open IPv6CP in this case. 3329 */ 3330 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3331 /* XXX this message should go away */ 3332 if (debug) 3333 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3334 ifp->if_xname); 3335 return; 3336 } 3337 3338 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3339 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3340 sppp_open_event(&ipv6cp, sp); 3341 } 3342 3343 static void 3344 sppp_ipv6cp_close(struct sppp *sp) 3345 { 3346 sppp_close_event(&ipv6cp, sp); 3347 } 3348 3349 static void 3350 sppp_ipv6cp_TO(void *cookie) 3351 { 3352 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3353 } 3354 3355 /* 3356 * Analyze a configure request. Return true if it was agreeable, and 3357 * caused action sca, false if it has been rejected or nak'ed, and 3358 * caused action scn. (The return value is used to make the state 3359 * transition decision in the state automaton.) 3360 */ 3361 static int 3362 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3363 { 3364 u_char *buf, *r, *p; 3365 struct ifnet *ifp = &sp->pp_if; 3366 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3367 struct in6_addr myaddr, desiredaddr, suggestaddr; 3368 int ifidcount; 3369 int type; 3370 int collision, nohisaddr; 3371 3372 len -= 4; 3373 origlen = len; 3374 /* 3375 * Make sure to allocate a buf that can at least hold a 3376 * conf-nak with an `address' option. We might need it below. 3377 */ 3378 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3379 if (! buf) 3380 return (0); 3381 3382 /* pass 1: see if we can recognize them */ 3383 if (debug) 3384 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3385 ifp->if_xname); 3386 p = (void *)(h + 1); 3387 ifidcount = 0; 3388 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3389 /* Sanity check option length */ 3390 if (p[1] > len) { 3391 /* XXX just RXJ? */ 3392 addlog("%s: received malicious IPCPv6 option, " 3393 "dropping\n", ifp->if_xname); 3394 goto drop; 3395 } 3396 if (debug) 3397 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3398 switch (*p) { 3399 case IPV6CP_OPT_IFID: 3400 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3401 /* correctly formed address option */ 3402 ifidcount++; 3403 continue; 3404 } 3405 if (debug) 3406 addlog(" [invalid]"); 3407 break; 3408 #ifdef notyet 3409 case IPV6CP_OPT_COMPRESSION: 3410 if (len >= 4 && p[1] >= 4) { 3411 /* correctly formed compress option */ 3412 continue; 3413 } 3414 if (debug) 3415 addlog(" [invalid]"); 3416 break; 3417 #endif 3418 default: 3419 /* Others not supported. */ 3420 if (debug) 3421 addlog(" [rej]"); 3422 break; 3423 } 3424 /* Add the option to rejected list. */ 3425 bcopy (p, r, p[1]); 3426 r += p[1]; 3427 rlen += p[1]; 3428 } 3429 if (rlen) { 3430 if (debug) 3431 addlog(" send conf-rej\n"); 3432 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3433 goto end; 3434 } else if (debug) 3435 addlog("\n"); 3436 3437 /* pass 2: parse option values */ 3438 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3439 if (debug) 3440 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3441 ifp->if_xname); 3442 p = (void *)(h + 1); 3443 len = origlen; 3444 type = CONF_ACK; 3445 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3446 if (debug) 3447 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3448 switch (*p) { 3449 #ifdef notyet 3450 case IPV6CP_OPT_COMPRESSION: 3451 continue; 3452 #endif 3453 case IPV6CP_OPT_IFID: 3454 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3455 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3456 collision = (memcmp(&desiredaddr.s6_addr[8], 3457 &myaddr.s6_addr[8], 8) == 0); 3458 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3459 3460 desiredaddr.s6_addr16[0] = htons(0xfe80); 3461 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3462 3463 if (!collision && !nohisaddr) { 3464 /* no collision, hisaddr known - Conf-Ack */ 3465 type = CONF_ACK; 3466 3467 if (debug) { 3468 addlog(" %s [%s]", 3469 ip6_sprintf(&desiredaddr), 3470 sppp_cp_type_name(type)); 3471 } 3472 continue; 3473 } 3474 3475 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3476 if (collision && nohisaddr) { 3477 /* collision, hisaddr unknown - Conf-Rej */ 3478 type = CONF_REJ; 3479 memset(&p[2], 0, 8); 3480 } else { 3481 /* 3482 * - no collision, hisaddr unknown, or 3483 * - collision, hisaddr known 3484 * Conf-Nak, suggest hisaddr 3485 */ 3486 type = CONF_NAK; 3487 sppp_suggest_ip6_addr(sp, &suggestaddr); 3488 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3489 } 3490 if (debug) 3491 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3492 sppp_cp_type_name(type)); 3493 break; 3494 } 3495 /* Add the option to nak'ed list. */ 3496 bcopy (p, r, p[1]); 3497 r += p[1]; 3498 rlen += p[1]; 3499 } 3500 3501 if (rlen == 0 && type == CONF_ACK) { 3502 if (debug) 3503 addlog(" send %s\n", sppp_cp_type_name(type)); 3504 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3505 } else { 3506 #ifdef notdef 3507 if (type == CONF_ACK) 3508 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3509 #endif 3510 3511 if (debug) { 3512 addlog(" send %s suggest %s\n", 3513 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3514 } 3515 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3516 } 3517 3518 end: 3519 free(buf, M_TEMP); 3520 return (rlen == 0); 3521 3522 drop: 3523 free(buf, M_TEMP); 3524 return -1; 3525 } 3526 3527 /* 3528 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3529 * negotiation. 3530 */ 3531 static void 3532 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3533 { 3534 u_char *buf, *p; 3535 struct ifnet *ifp = &sp->pp_if; 3536 int debug = ifp->if_flags & IFF_DEBUG; 3537 3538 len -= 4; 3539 buf = malloc (len, M_TEMP, M_NOWAIT); 3540 if (!buf) 3541 return; 3542 3543 if (debug) 3544 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3545 ifp->if_xname); 3546 3547 p = (void *)(h + 1); 3548 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3549 if (p[1] > len) { 3550 /* XXX just RXJ? */ 3551 addlog("%s: received malicious IPCPv6 option, " 3552 "dropping\n", ifp->if_xname); 3553 goto drop; 3554 } 3555 if (debug) 3556 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3557 switch (*p) { 3558 case IPV6CP_OPT_IFID: 3559 /* 3560 * Peer doesn't grok address option. This is 3561 * bad. XXX Should we better give up here? 3562 */ 3563 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3564 break; 3565 #ifdef notyet 3566 case IPV6CP_OPT_COMPRESS: 3567 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3568 break; 3569 #endif 3570 } 3571 } 3572 if (debug) 3573 addlog("\n"); 3574 drop: 3575 free(buf, M_TEMP); 3576 return; 3577 } 3578 3579 /* 3580 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3581 * negotiation. 3582 */ 3583 static void 3584 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3585 { 3586 u_char *buf, *p; 3587 struct ifnet *ifp = &sp->pp_if; 3588 int debug = ifp->if_flags & IFF_DEBUG; 3589 struct in6_addr suggestaddr; 3590 3591 len -= 4; 3592 buf = malloc (len, M_TEMP, M_NOWAIT); 3593 if (!buf) 3594 return; 3595 3596 if (debug) 3597 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3598 ifp->if_xname); 3599 3600 p = (void *)(h + 1); 3601 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3602 if (p[1] > len) { 3603 /* XXX just RXJ? */ 3604 addlog("%s: received malicious IPCPv6 option, " 3605 "dropping\n", ifp->if_xname); 3606 goto drop; 3607 } 3608 if (debug) 3609 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3610 switch (*p) { 3611 case IPV6CP_OPT_IFID: 3612 /* 3613 * Peer doesn't like our local ifid. See 3614 * if we can do something for him. We'll drop 3615 * him our address then. 3616 */ 3617 if (len < 10 || p[1] != 10) 3618 break; 3619 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3620 suggestaddr.s6_addr16[0] = htons(0xfe80); 3621 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3622 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3623 3624 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3625 if (debug) 3626 addlog(" [suggestaddr %s]", 3627 ip6_sprintf(&suggestaddr)); 3628 #ifdef IPV6CP_MYIFID_DYN 3629 /* 3630 * When doing dynamic address assignment, 3631 * we accept his offer. 3632 */ 3633 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3634 struct in6_addr lastsuggest; 3635 /* 3636 * If <suggested myaddr from peer> equals to 3637 * <hisaddr we have suggested last time>, 3638 * we have a collision. generate new random 3639 * ifid. 3640 */ 3641 sppp_suggest_ip6_addr(&lastsuggest); 3642 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3643 lastsuggest)) { 3644 if (debug) 3645 addlog(" [random]"); 3646 sppp_gen_ip6_addr(sp, &suggestaddr); 3647 } 3648 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3649 if (debug) 3650 addlog(" [agree]"); 3651 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3652 } 3653 #else 3654 /* 3655 * Since we do not do dynamic address assignment, 3656 * we ignore it and thus continue to negotiate 3657 * our already existing value. This can possibly 3658 * go into infinite request-reject loop. 3659 * 3660 * This is not likely because we normally use 3661 * ifid based on MAC-address. 3662 * If you have no ethernet card on the node, too bad. 3663 * XXX should we use fail_counter? 3664 */ 3665 #endif 3666 break; 3667 #ifdef notyet 3668 case IPV6CP_OPT_COMPRESS: 3669 /* 3670 * Peer wants different compression parameters. 3671 */ 3672 break; 3673 #endif 3674 } 3675 } 3676 if (debug) 3677 addlog("\n"); 3678 drop: 3679 free(buf, M_TEMP); 3680 return; 3681 } 3682 3683 static void 3684 sppp_ipv6cp_tlu(struct sppp *sp) 3685 { 3686 /* we are up - notify isdn daemon */ 3687 if (sp->pp_con) 3688 sp->pp_con(sp); 3689 } 3690 3691 static void 3692 sppp_ipv6cp_tld(struct sppp *sp) 3693 { 3694 } 3695 3696 static void 3697 sppp_ipv6cp_tls(struct sppp *sp) 3698 { 3699 /* indicate to LCP that it must stay alive */ 3700 sp->lcp.protos |= (1 << IDX_IPV6CP); 3701 } 3702 3703 static void 3704 sppp_ipv6cp_tlf(struct sppp *sp) 3705 { 3706 /* we no longer need LCP */ 3707 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3708 } 3709 3710 static void 3711 sppp_ipv6cp_scr(struct sppp *sp) 3712 { 3713 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3714 struct in6_addr ouraddr; 3715 int i = 0; 3716 3717 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3718 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3719 opt[i++] = IPV6CP_OPT_IFID; 3720 opt[i++] = 10; 3721 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3722 i += 8; 3723 } 3724 3725 #ifdef notyet 3726 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3727 opt[i++] = IPV6CP_OPT_COMPRESSION; 3728 opt[i++] = 4; 3729 opt[i++] = 0; /* TBD */ 3730 opt[i++] = 0; /* TBD */ 3731 /* variable length data may follow */ 3732 } 3733 #endif 3734 3735 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3736 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3737 } 3738 #else /*INET6*/ 3739 static void 3740 sppp_ipv6cp_init(struct sppp *sp) 3741 { 3742 } 3743 3744 static void 3745 sppp_ipv6cp_up(struct sppp *sp) 3746 { 3747 } 3748 3749 static void 3750 sppp_ipv6cp_down(struct sppp *sp) 3751 { 3752 } 3753 3754 static void 3755 sppp_ipv6cp_open(struct sppp *sp) 3756 { 3757 } 3758 3759 static void 3760 sppp_ipv6cp_close(struct sppp *sp) 3761 { 3762 } 3763 3764 static void 3765 sppp_ipv6cp_TO(void *sp) 3766 { 3767 } 3768 3769 static int 3770 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3771 int len) 3772 { 3773 return 0; 3774 } 3775 3776 static void 3777 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3778 int len) 3779 { 3780 } 3781 3782 static void 3783 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3784 int len) 3785 { 3786 } 3787 3788 static void 3789 sppp_ipv6cp_tlu(struct sppp *sp) 3790 { 3791 } 3792 3793 static void 3794 sppp_ipv6cp_tld(struct sppp *sp) 3795 { 3796 } 3797 3798 static void 3799 sppp_ipv6cp_tls(struct sppp *sp) 3800 { 3801 } 3802 3803 static void 3804 sppp_ipv6cp_tlf(struct sppp *sp) 3805 { 3806 } 3807 3808 static void 3809 sppp_ipv6cp_scr(struct sppp *sp) 3810 { 3811 } 3812 #endif /*INET6*/ 3813 3814 3815 /* 3816 *--------------------------------------------------------------------------* 3817 * * 3818 * The CHAP implementation. * 3819 * * 3820 *--------------------------------------------------------------------------* 3821 */ 3822 3823 /* 3824 * The authentication protocols don't employ a full-fledged state machine as 3825 * the control protocols do, since they do have Open and Close events, but 3826 * not Up and Down, nor are they explicitly terminated. Also, use of the 3827 * authentication protocols may be different in both directions (this makes 3828 * sense, think of a machine that never accepts incoming calls but only 3829 * calls out, it doesn't require the called party to authenticate itself). 3830 * 3831 * Our state machine for the local authentication protocol (we are requesting 3832 * the peer to authenticate) looks like: 3833 * 3834 * RCA- 3835 * +--------------------------------------------+ 3836 * V scn,tld| 3837 * +--------+ Close +---------+ RCA+ 3838 * | |<----------------------------------| |------+ 3839 * +--->| Closed | TO* | Opened | sca | 3840 * | | |-----+ +-------| |<-----+ 3841 * | +--------+ irc | | +---------+ 3842 * | ^ | | ^ 3843 * | | | | | 3844 * | | | | | 3845 * | TO-| | | | 3846 * | |tld TO+ V | | 3847 * | | +------->+ | | 3848 * | | | | | | 3849 * | +--------+ V | | 3850 * | | |<----+<--------------------+ | 3851 * | | Req- | scr | 3852 * | | Sent | | 3853 * | | | | 3854 * | +--------+ | 3855 * | RCA- | | RCA+ | 3856 * +------+ +------------------------------------------+ 3857 * scn,tld sca,irc,ict,tlu 3858 * 3859 * 3860 * with: 3861 * 3862 * Open: LCP reached authentication phase 3863 * Close: LCP reached terminate phase 3864 * 3865 * RCA+: received reply (pap-req, chap-response), acceptable 3866 * RCN: received reply (pap-req, chap-response), not acceptable 3867 * TO+: timeout with restart counter >= 0 3868 * TO-: timeout with restart counter < 0 3869 * TO*: reschedule timeout for CHAP 3870 * 3871 * scr: send request packet (none for PAP, chap-challenge) 3872 * sca: send ack packet (pap-ack, chap-success) 3873 * scn: send nak packet (pap-nak, chap-failure) 3874 * ict: initialize re-challenge timer (CHAP only) 3875 * 3876 * tlu: this-layer-up, LCP reaches network phase 3877 * tld: this-layer-down, LCP enters terminate phase 3878 * 3879 * Note that in CHAP mode, after sending a new challenge, while the state 3880 * automaton falls back into Req-Sent state, it doesn't signal a tld 3881 * event to LCP, so LCP remains in network phase. Only after not getting 3882 * any response (or after getting an unacceptable response), CHAP closes, 3883 * causing LCP to enter terminate phase. 3884 * 3885 * With PAP, there is no initial request that can be sent. The peer is 3886 * expected to send one based on the successful negotiation of PAP as 3887 * the authentication protocol during the LCP option negotiation. 3888 * 3889 * Incoming authentication protocol requests (remote requests 3890 * authentication, we are peer) don't employ a state machine at all, 3891 * they are simply answered. Some peers [Ascend P50 firmware rev 3892 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3893 * still in authentication phase (thereby violating the standard that 3894 * demands that these NCP packets are to be discarded), so we keep 3895 * track of the peer demanding us to authenticate, and only proceed to 3896 * phase network once we've seen a positive acknowledge for the 3897 * authentication. 3898 */ 3899 3900 /* 3901 * Handle incoming CHAP packets. 3902 */ 3903 void 3904 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3905 { 3906 STDDCL; 3907 struct lcp_header *h; 3908 int len, x; 3909 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3910 int value_len, name_len; 3911 MD5_CTX ctx; 3912 3913 len = m->m_pkthdr.len; 3914 if (len < 4) { 3915 if (debug) 3916 log(LOG_DEBUG, 3917 "%s: chap invalid packet length: %d bytes\n", 3918 ifp->if_xname, len); 3919 return; 3920 } 3921 h = mtod(m, struct lcp_header *); 3922 if (len > ntohs(h->len)) 3923 len = ntohs(h->len); 3924 3925 switch (h->type) { 3926 /* challenge, failure and success are his authproto */ 3927 case CHAP_CHALLENGE: 3928 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3929 /* can't do anything usefull */ 3930 sp->pp_auth_failures++; 3931 printf("%s: chap input without my name and my secret being set\n", 3932 ifp->if_xname); 3933 break; 3934 } 3935 value = 1 + (u_char *)(h + 1); 3936 value_len = value[-1]; 3937 name = value + value_len; 3938 name_len = len - value_len - 5; 3939 if (name_len < 0) { 3940 if (debug) { 3941 log(LOG_DEBUG, 3942 "%s: chap corrupted challenge " 3943 "<%s id=0x%x len=%d", 3944 ifp->if_xname, 3945 sppp_auth_type_name(PPP_CHAP, h->type), 3946 h->ident, ntohs(h->len)); 3947 if (len > 4) 3948 sppp_print_bytes((u_char *)(h + 1), 3949 len - 4); 3950 addlog(">\n"); 3951 } 3952 break; 3953 } 3954 3955 if (debug) { 3956 log(LOG_DEBUG, 3957 "%s: chap input <%s id=0x%x len=%d name=", 3958 ifp->if_xname, 3959 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3960 ntohs(h->len)); 3961 sppp_print_string((char *) name, name_len); 3962 addlog(" value-size=%d value=", value_len); 3963 sppp_print_bytes(value, value_len); 3964 addlog(">\n"); 3965 } 3966 3967 /* Compute reply value. */ 3968 MD5Init(&ctx); 3969 MD5Update(&ctx, &h->ident, 1); 3970 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3971 MD5Update(&ctx, value, value_len); 3972 MD5Final(digest, &ctx); 3973 dsize = sizeof digest; 3974 3975 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3976 sizeof dsize, (const char *)&dsize, 3977 sizeof digest, digest, 3978 sp->myauth.name_len, 3979 sp->myauth.name, 3980 0); 3981 break; 3982 3983 case CHAP_SUCCESS: 3984 if (debug) { 3985 log(LOG_DEBUG, "%s: chap success", 3986 ifp->if_xname); 3987 if (len > 4) { 3988 addlog(": "); 3989 sppp_print_string((char *)(h + 1), len - 4); 3990 } 3991 addlog("\n"); 3992 } 3993 x = splnet(); 3994 sp->pp_auth_failures = 0; 3995 sp->pp_flags &= ~PP_NEEDAUTH; 3996 if (sp->myauth.proto == PPP_CHAP && 3997 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3998 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3999 /* 4000 * We are authenticator for CHAP but didn't 4001 * complete yet. Leave it to tlu to proceed 4002 * to network phase. 4003 */ 4004 splx(x); 4005 break; 4006 } 4007 splx(x); 4008 sppp_phase_network(sp); 4009 break; 4010 4011 case CHAP_FAILURE: 4012 x = splnet(); 4013 sp->pp_auth_failures++; 4014 splx(x); 4015 if (debug) { 4016 log(LOG_INFO, "%s: chap failure", 4017 ifp->if_xname); 4018 if (len > 4) { 4019 addlog(": "); 4020 sppp_print_string((char *)(h + 1), len - 4); 4021 } 4022 addlog("\n"); 4023 } else 4024 log(LOG_INFO, "%s: chap failure\n", 4025 ifp->if_xname); 4026 /* await LCP shutdown by authenticator */ 4027 break; 4028 4029 /* response is my authproto */ 4030 case CHAP_RESPONSE: 4031 if (sp->hisauth.secret == NULL) { 4032 /* can't do anything usefull */ 4033 printf("%s: chap input without his secret being set\n", 4034 ifp->if_xname); 4035 break; 4036 } 4037 value = 1 + (u_char *)(h + 1); 4038 value_len = value[-1]; 4039 name = value + value_len; 4040 name_len = len - value_len - 5; 4041 if (name_len < 0) { 4042 if (debug) { 4043 log(LOG_DEBUG, 4044 "%s: chap corrupted response " 4045 "<%s id=0x%x len=%d", 4046 ifp->if_xname, 4047 sppp_auth_type_name(PPP_CHAP, h->type), 4048 h->ident, ntohs(h->len)); 4049 if (len > 4) 4050 sppp_print_bytes((u_char *)(h + 1), 4051 len - 4); 4052 addlog(">\n"); 4053 } 4054 break; 4055 } 4056 if (h->ident != sp->confid[IDX_CHAP]) { 4057 if (debug) 4058 log(LOG_DEBUG, 4059 "%s: chap dropping response for old ID " 4060 "(got %d, expected %d)\n", 4061 ifp->if_xname, 4062 h->ident, sp->confid[IDX_CHAP]); 4063 break; 4064 } 4065 if (sp->hisauth.name != NULL && 4066 (name_len != sp->hisauth.name_len 4067 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4068 log(LOG_INFO, "%s: chap response, his name ", 4069 ifp->if_xname); 4070 sppp_print_string(name, name_len); 4071 addlog(" != expected "); 4072 sppp_print_string(sp->hisauth.name, 4073 sp->hisauth.name_len); 4074 addlog("\n"); 4075 goto chap_failure; 4076 } 4077 if (debug) { 4078 log(LOG_DEBUG, "%s: chap input(%s) " 4079 "<%s id=0x%x len=%d name=", 4080 ifp->if_xname, 4081 sppp_state_name(sp->state[IDX_CHAP]), 4082 sppp_auth_type_name(PPP_CHAP, h->type), 4083 h->ident, ntohs(h->len)); 4084 sppp_print_string((char *)name, name_len); 4085 addlog(" value-size=%d value=", value_len); 4086 sppp_print_bytes(value, value_len); 4087 addlog(">\n"); 4088 } 4089 if (value_len != sizeof(sp->myauth.challenge)) { 4090 if (debug) 4091 log(LOG_DEBUG, 4092 "%s: chap bad hash value length: " 4093 "%d bytes, should be %ld\n", 4094 ifp->if_xname, value_len, 4095 (long) sizeof(sp->myauth.challenge)); 4096 goto chap_failure; 4097 } 4098 4099 MD5Init(&ctx); 4100 MD5Update(&ctx, &h->ident, 1); 4101 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4102 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4103 MD5Final(digest, &ctx); 4104 4105 #define FAILMSG "Failed..." 4106 #define SUCCMSG "Welcome!" 4107 4108 if (value_len != sizeof digest || 4109 memcmp(digest, value, value_len) != 0) { 4110 chap_failure: 4111 /* action scn, tld */ 4112 x = splnet(); 4113 sp->pp_auth_failures++; 4114 splx(x); 4115 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4116 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4117 0); 4118 chap.tld(sp); 4119 break; 4120 } 4121 sp->pp_auth_failures = 0; 4122 /* action sca, perhaps tlu */ 4123 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4124 sp->state[IDX_CHAP] == STATE_OPENED) 4125 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4126 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4127 0); 4128 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4129 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4130 chap.tlu(sp); 4131 } 4132 break; 4133 4134 default: 4135 /* Unknown CHAP packet type -- ignore. */ 4136 if (debug) { 4137 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4138 "<0x%x id=0x%xh len=%d", 4139 ifp->if_xname, 4140 sppp_state_name(sp->state[IDX_CHAP]), 4141 h->type, h->ident, ntohs(h->len)); 4142 if (len > 4) 4143 sppp_print_bytes((u_char *)(h + 1), len - 4); 4144 addlog(">\n"); 4145 } 4146 break; 4147 4148 } 4149 } 4150 4151 static void 4152 sppp_chap_init(struct sppp *sp) 4153 { 4154 /* Chap doesn't have STATE_INITIAL at all. */ 4155 sp->state[IDX_CHAP] = STATE_CLOSED; 4156 sp->fail_counter[IDX_CHAP] = 0; 4157 sp->pp_seq[IDX_CHAP] = 0; 4158 sp->pp_rseq[IDX_CHAP] = 0; 4159 callout_init(&sp->ch[IDX_CHAP], 0); 4160 } 4161 4162 static void 4163 sppp_chap_open(struct sppp *sp) 4164 { 4165 if (sp->myauth.proto == PPP_CHAP && 4166 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4167 /* we are authenticator for CHAP, start it */ 4168 chap.scr(sp); 4169 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4170 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4171 } 4172 /* nothing to be done if we are peer, await a challenge */ 4173 } 4174 4175 static void 4176 sppp_chap_close(struct sppp *sp) 4177 { 4178 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4179 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4180 } 4181 4182 static void 4183 sppp_chap_TO(void *cookie) 4184 { 4185 struct sppp *sp = (struct sppp *)cookie; 4186 STDDCL; 4187 int s; 4188 4189 s = splnet(); 4190 if (debug) 4191 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4192 ifp->if_xname, 4193 sppp_state_name(sp->state[IDX_CHAP]), 4194 sp->rst_counter[IDX_CHAP]); 4195 4196 if (--sp->rst_counter[IDX_CHAP] < 0) 4197 /* TO- event */ 4198 switch (sp->state[IDX_CHAP]) { 4199 case STATE_REQ_SENT: 4200 chap.tld(sp); 4201 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4202 break; 4203 } 4204 else 4205 /* TO+ (or TO*) event */ 4206 switch (sp->state[IDX_CHAP]) { 4207 case STATE_OPENED: 4208 /* TO* event */ 4209 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4210 /* fall through */ 4211 case STATE_REQ_SENT: 4212 chap.scr(sp); 4213 /* sppp_cp_change_state() will restart the timer */ 4214 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4215 break; 4216 } 4217 4218 splx(s); 4219 } 4220 4221 static void 4222 sppp_chap_tlu(struct sppp *sp) 4223 { 4224 STDDCL; 4225 int i, x; 4226 4227 i = 0; 4228 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4229 4230 /* 4231 * Some broken CHAP implementations (Conware CoNet, firmware 4232 * 4.0.?) don't want to re-authenticate their CHAP once the 4233 * initial challenge-response exchange has taken place. 4234 * Provide for an option to avoid rechallenges. 4235 */ 4236 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4237 /* 4238 * Compute the re-challenge timeout. This will yield 4239 * a number between 300 and 810 seconds. 4240 */ 4241 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4242 4243 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4244 } 4245 4246 if (debug) { 4247 log(LOG_DEBUG, 4248 "%s: chap %s, ", 4249 ifp->if_xname, 4250 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4251 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4252 addlog("next re-challenge in %d seconds\n", i); 4253 else 4254 addlog("re-challenging supressed\n"); 4255 } 4256 4257 x = splnet(); 4258 sp->pp_auth_failures = 0; 4259 /* indicate to LCP that we need to be closed down */ 4260 sp->lcp.protos |= (1 << IDX_CHAP); 4261 4262 if (sp->pp_flags & PP_NEEDAUTH) { 4263 /* 4264 * Remote is authenticator, but his auth proto didn't 4265 * complete yet. Defer the transition to network 4266 * phase. 4267 */ 4268 splx(x); 4269 return; 4270 } 4271 splx(x); 4272 4273 /* 4274 * If we are already in phase network, we are done here. This 4275 * is the case if this is a dummy tlu event after a re-challenge. 4276 */ 4277 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4278 sppp_phase_network(sp); 4279 } 4280 4281 static void 4282 sppp_chap_tld(struct sppp *sp) 4283 { 4284 STDDCL; 4285 4286 if (debug) 4287 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4288 callout_stop(&sp->ch[IDX_CHAP]); 4289 sp->lcp.protos &= ~(1 << IDX_CHAP); 4290 4291 lcp.Close(sp); 4292 } 4293 4294 static void 4295 sppp_chap_scr(struct sppp *sp) 4296 { 4297 u_int32_t *ch; 4298 u_char clen; 4299 4300 if (sp->myauth.name == NULL) { 4301 /* can't do anything usefull */ 4302 printf("%s: chap starting without my name being set\n", 4303 sp->pp_if.if_xname); 4304 return; 4305 } 4306 4307 /* Compute random challenge. */ 4308 ch = (u_int32_t *)sp->myauth.challenge; 4309 ch[0] = arc4random(); 4310 ch[1] = arc4random(); 4311 ch[2] = arc4random(); 4312 ch[3] = arc4random(); 4313 clen = 16; /* 4 * sizeof(u_int32_t) */ 4314 4315 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4316 4317 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4318 sizeof clen, (const char *)&clen, 4319 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4320 sp->myauth.name_len, 4321 sp->myauth.name, 4322 0); 4323 } 4324 4325 /* 4326 *--------------------------------------------------------------------------* 4327 * * 4328 * The PAP implementation. * 4329 * * 4330 *--------------------------------------------------------------------------* 4331 */ 4332 /* 4333 * For PAP, we need to keep a little state also if we are the peer, not the 4334 * authenticator. This is since we don't get a request to authenticate, but 4335 * have to repeatedly authenticate ourself until we got a response (or the 4336 * retry counter is expired). 4337 */ 4338 4339 /* 4340 * Handle incoming PAP packets. */ 4341 static void 4342 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4343 { 4344 STDDCL; 4345 struct lcp_header *h; 4346 int len, x; 4347 u_char mlen; 4348 char *name, *secret; 4349 int name_len, secret_len; 4350 4351 /* 4352 * Malicious input might leave this uninitialized, so 4353 * init to an impossible value. 4354 */ 4355 secret_len = -1; 4356 4357 len = m->m_pkthdr.len; 4358 if (len < 5) { 4359 if (debug) 4360 log(LOG_DEBUG, 4361 "%s: pap invalid packet length: %d bytes\n", 4362 ifp->if_xname, len); 4363 return; 4364 } 4365 h = mtod(m, struct lcp_header *); 4366 if (len > ntohs(h->len)) 4367 len = ntohs(h->len); 4368 switch (h->type) { 4369 /* PAP request is my authproto */ 4370 case PAP_REQ: 4371 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4372 /* can't do anything usefull */ 4373 printf("%s: pap request without his name and his secret being set\n", 4374 ifp->if_xname); 4375 break; 4376 } 4377 name = 1 + (u_char *)(h + 1); 4378 name_len = name[-1]; 4379 secret = name + name_len + 1; 4380 if (name_len > len - 6 || 4381 (secret_len = secret[-1]) > len - 6 - name_len) { 4382 if (debug) { 4383 log(LOG_DEBUG, "%s: pap corrupted input " 4384 "<%s id=0x%x len=%d", 4385 ifp->if_xname, 4386 sppp_auth_type_name(PPP_PAP, h->type), 4387 h->ident, ntohs(h->len)); 4388 if (len > 4) 4389 sppp_print_bytes((u_char *)(h + 1), 4390 len - 4); 4391 addlog(">\n"); 4392 } 4393 break; 4394 } 4395 if (debug) { 4396 log(LOG_DEBUG, "%s: pap input(%s) " 4397 "<%s id=0x%x len=%d name=", 4398 ifp->if_xname, 4399 sppp_state_name(sp->state[IDX_PAP]), 4400 sppp_auth_type_name(PPP_PAP, h->type), 4401 h->ident, ntohs(h->len)); 4402 sppp_print_string((char *)name, name_len); 4403 addlog(" secret="); 4404 sppp_print_string((char *)secret, secret_len); 4405 addlog(">\n"); 4406 } 4407 if (name_len != sp->hisauth.name_len || 4408 secret_len != sp->hisauth.secret_len || 4409 memcmp(name, sp->hisauth.name, name_len) != 0 || 4410 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4411 /* action scn, tld */ 4412 sp->pp_auth_failures++; 4413 mlen = sizeof(FAILMSG) - 1; 4414 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4415 sizeof mlen, (const char *)&mlen, 4416 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4417 0); 4418 pap.tld(sp); 4419 break; 4420 } 4421 /* action sca, perhaps tlu */ 4422 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4423 sp->state[IDX_PAP] == STATE_OPENED) { 4424 mlen = sizeof(SUCCMSG) - 1; 4425 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4426 sizeof mlen, (const char *)&mlen, 4427 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4428 0); 4429 } 4430 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4431 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4432 pap.tlu(sp); 4433 } 4434 break; 4435 4436 /* ack and nak are his authproto */ 4437 case PAP_ACK: 4438 callout_stop(&sp->pap_my_to_ch); 4439 if (debug) { 4440 log(LOG_DEBUG, "%s: pap success", 4441 ifp->if_xname); 4442 name = 1 + (u_char *)(h + 1); 4443 name_len = name[-1]; 4444 if (len > 5 && name_len < len+4) { 4445 addlog(": "); 4446 sppp_print_string(name, name_len); 4447 } 4448 addlog("\n"); 4449 } 4450 x = splnet(); 4451 sp->pp_auth_failures = 0; 4452 sp->pp_flags &= ~PP_NEEDAUTH; 4453 if (sp->myauth.proto == PPP_PAP && 4454 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4455 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4456 /* 4457 * We are authenticator for PAP but didn't 4458 * complete yet. Leave it to tlu to proceed 4459 * to network phase. 4460 */ 4461 splx(x); 4462 break; 4463 } 4464 splx(x); 4465 sppp_phase_network(sp); 4466 break; 4467 4468 case PAP_NAK: 4469 callout_stop(&sp->pap_my_to_ch); 4470 sp->pp_auth_failures++; 4471 if (debug) { 4472 log(LOG_INFO, "%s: pap failure", 4473 ifp->if_xname); 4474 name = 1 + (u_char *)(h + 1); 4475 name_len = name[-1]; 4476 if (len > 5 && name_len < len+4) { 4477 addlog(": "); 4478 sppp_print_string(name, name_len); 4479 } 4480 addlog("\n"); 4481 } else 4482 log(LOG_INFO, "%s: pap failure\n", 4483 ifp->if_xname); 4484 /* await LCP shutdown by authenticator */ 4485 break; 4486 4487 default: 4488 /* Unknown PAP packet type -- ignore. */ 4489 if (debug) { 4490 log(LOG_DEBUG, "%s: pap corrupted input " 4491 "<0x%x id=0x%x len=%d", 4492 ifp->if_xname, 4493 h->type, h->ident, ntohs(h->len)); 4494 if (len > 4) 4495 sppp_print_bytes((u_char *)(h + 1), len - 4); 4496 addlog(">\n"); 4497 } 4498 break; 4499 4500 } 4501 } 4502 4503 static void 4504 sppp_pap_init(struct sppp *sp) 4505 { 4506 /* PAP doesn't have STATE_INITIAL at all. */ 4507 sp->state[IDX_PAP] = STATE_CLOSED; 4508 sp->fail_counter[IDX_PAP] = 0; 4509 sp->pp_seq[IDX_PAP] = 0; 4510 sp->pp_rseq[IDX_PAP] = 0; 4511 callout_init(&sp->ch[IDX_PAP], 0); 4512 callout_init(&sp->pap_my_to_ch, 0); 4513 } 4514 4515 static void 4516 sppp_pap_open(struct sppp *sp) 4517 { 4518 if (sp->hisauth.proto == PPP_PAP && 4519 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4520 /* we are authenticator for PAP, start our timer */ 4521 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4522 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4523 } 4524 if (sp->myauth.proto == PPP_PAP) { 4525 /* we are peer, send a request, and start a timer */ 4526 pap.scr(sp); 4527 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4528 sppp_pap_my_TO, sp); 4529 } 4530 } 4531 4532 static void 4533 sppp_pap_close(struct sppp *sp) 4534 { 4535 if (sp->state[IDX_PAP] != STATE_CLOSED) 4536 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4537 } 4538 4539 /* 4540 * That's the timeout routine if we are authenticator. Since the 4541 * authenticator is basically passive in PAP, we can't do much here. 4542 */ 4543 static void 4544 sppp_pap_TO(void *cookie) 4545 { 4546 struct sppp *sp = (struct sppp *)cookie; 4547 STDDCL; 4548 int s; 4549 4550 s = splnet(); 4551 if (debug) 4552 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4553 ifp->if_xname, 4554 sppp_state_name(sp->state[IDX_PAP]), 4555 sp->rst_counter[IDX_PAP]); 4556 4557 if (--sp->rst_counter[IDX_PAP] < 0) 4558 /* TO- event */ 4559 switch (sp->state[IDX_PAP]) { 4560 case STATE_REQ_SENT: 4561 pap.tld(sp); 4562 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4563 break; 4564 } 4565 else 4566 /* TO+ event, not very much we could do */ 4567 switch (sp->state[IDX_PAP]) { 4568 case STATE_REQ_SENT: 4569 /* sppp_cp_change_state() will restart the timer */ 4570 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4571 break; 4572 } 4573 4574 splx(s); 4575 } 4576 4577 /* 4578 * That's the timeout handler if we are peer. Since the peer is active, 4579 * we need to retransmit our PAP request since it is apparently lost. 4580 * XXX We should impose a max counter. 4581 */ 4582 static void 4583 sppp_pap_my_TO(void *cookie) 4584 { 4585 struct sppp *sp = (struct sppp *)cookie; 4586 STDDCL; 4587 4588 if (debug) 4589 log(LOG_DEBUG, "%s: pap peer TO\n", 4590 ifp->if_xname); 4591 4592 pap.scr(sp); 4593 } 4594 4595 static void 4596 sppp_pap_tlu(struct sppp *sp) 4597 { 4598 STDDCL; 4599 int x; 4600 4601 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4602 4603 if (debug) 4604 log(LOG_DEBUG, "%s: %s tlu\n", 4605 ifp->if_xname, pap.name); 4606 4607 x = splnet(); 4608 sp->pp_auth_failures = 0; 4609 /* indicate to LCP that we need to be closed down */ 4610 sp->lcp.protos |= (1 << IDX_PAP); 4611 4612 if (sp->pp_flags & PP_NEEDAUTH) { 4613 /* 4614 * Remote is authenticator, but his auth proto didn't 4615 * complete yet. Defer the transition to network 4616 * phase. 4617 */ 4618 splx(x); 4619 return; 4620 } 4621 splx(x); 4622 sppp_phase_network(sp); 4623 } 4624 4625 static void 4626 sppp_pap_tld(struct sppp *sp) 4627 { 4628 STDDCL; 4629 4630 if (debug) 4631 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4632 callout_stop(&sp->ch[IDX_PAP]); 4633 callout_stop(&sp->pap_my_to_ch); 4634 sp->lcp.protos &= ~(1 << IDX_PAP); 4635 4636 lcp.Close(sp); 4637 } 4638 4639 static void 4640 sppp_pap_scr(struct sppp *sp) 4641 { 4642 u_char idlen, pwdlen; 4643 4644 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4645 /* can't do anything usefull */ 4646 printf("%s: pap starting without my name and secret being set\n", 4647 sp->pp_if.if_xname); 4648 return; 4649 } 4650 4651 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4652 pwdlen = sp->myauth.secret_len; 4653 idlen = sp->myauth.name_len; 4654 4655 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4656 sizeof idlen, (const char *)&idlen, 4657 idlen, sp->myauth.name, 4658 sizeof pwdlen, (const char *)&pwdlen, 4659 pwdlen, sp->myauth.secret, 4660 0); 4661 } 4662 4663 /* 4664 * Random miscellaneous functions. 4665 */ 4666 4667 /* 4668 * Send a PAP or CHAP proto packet. 4669 * 4670 * Varadic function, each of the elements for the ellipsis is of type 4671 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4672 * mlen == 0. 4673 * NOTE: never declare variadic functions with types subject to type 4674 * promotion (i.e. u_char). This is asking for big trouble depending 4675 * on the architecture you are on... 4676 */ 4677 4678 static void 4679 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4680 unsigned int type, unsigned int id, 4681 ...) 4682 { 4683 STDDCL; 4684 struct lcp_header *lh; 4685 struct mbuf *m; 4686 u_char *p; 4687 int len; 4688 size_t pkthdrlen; 4689 unsigned int mlen; 4690 const char *msg; 4691 va_list ap; 4692 4693 MGETHDR(m, M_DONTWAIT, MT_DATA); 4694 if (! m) 4695 return; 4696 m->m_pkthdr.rcvif = 0; 4697 4698 if (sp->pp_flags & PP_NOFRAMING) { 4699 *mtod(m, u_int16_t *) = htons(cp->proto); 4700 pkthdrlen = 2; 4701 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4702 } else { 4703 struct ppp_header *h; 4704 h = mtod(m, struct ppp_header *); 4705 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4706 h->control = PPP_UI; /* Unnumbered Info */ 4707 h->protocol = htons(cp->proto); 4708 pkthdrlen = PPP_HEADER_LEN; 4709 4710 lh = (struct lcp_header *)(h + 1); 4711 } 4712 4713 lh->type = type; 4714 lh->ident = id; 4715 p = (u_char *)(lh + 1); 4716 4717 va_start(ap, id); 4718 len = 0; 4719 4720 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4721 msg = va_arg(ap, const char *); 4722 len += mlen; 4723 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4724 va_end(ap); 4725 m_freem(m); 4726 return; 4727 } 4728 4729 bcopy(msg, p, mlen); 4730 p += mlen; 4731 } 4732 va_end(ap); 4733 4734 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4735 lh->len = htons(LCP_HEADER_LEN + len); 4736 4737 if (debug) { 4738 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4739 ifp->if_xname, cp->name, 4740 sppp_auth_type_name(cp->proto, lh->type), 4741 lh->ident, ntohs(lh->len)); 4742 if (len) 4743 sppp_print_bytes((u_char *)(lh + 1), len); 4744 addlog(">\n"); 4745 } 4746 if (IF_QFULL(&sp->pp_cpq)) { 4747 IF_DROP(&sp->pp_fastq); 4748 IF_DROP(&ifp->if_snd); 4749 m_freem(m); 4750 ++ifp->if_oerrors; 4751 return; 4752 } else 4753 IF_ENQUEUE(&sp->pp_cpq, m); 4754 if (! (ifp->if_flags & IFF_OACTIVE)) 4755 (*ifp->if_start)(ifp); 4756 ifp->if_obytes += m->m_pkthdr.len + 3; 4757 } 4758 4759 /* 4760 * Send keepalive packets, every 10 seconds. 4761 */ 4762 static void 4763 sppp_keepalive(void *dummy) 4764 { 4765 struct sppp *sp; 4766 int s; 4767 time_t now; 4768 4769 s = splnet(); 4770 now = time_uptime; 4771 for (sp=spppq; sp; sp=sp->pp_next) { 4772 struct ifnet *ifp = &sp->pp_if; 4773 4774 /* check idle timeout */ 4775 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4776 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4777 /* idle timeout is enabled for this interface */ 4778 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4779 if (ifp->if_flags & IFF_DEBUG) 4780 printf("%s: no activity for %lu seconds\n", 4781 sp->pp_if.if_xname, 4782 (unsigned long)(now-sp->pp_last_activity)); 4783 lcp.Close(sp); 4784 continue; 4785 } 4786 } 4787 4788 /* Keepalive mode disabled or channel down? */ 4789 if (! (sp->pp_flags & PP_KEEPALIVE) || 4790 ! (ifp->if_flags & IFF_RUNNING)) 4791 continue; 4792 4793 /* No keepalive in PPP mode if LCP not opened yet. */ 4794 if (! (sp->pp_flags & PP_CISCO) && 4795 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4796 continue; 4797 4798 /* No echo reply, but maybe user data passed through? */ 4799 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4800 sp->pp_alivecnt = 0; 4801 continue; 4802 } 4803 4804 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4805 /* No keepalive packets got. Stop the interface. */ 4806 if_down (ifp); 4807 IF_PURGE(&sp->pp_cpq); 4808 if (! (sp->pp_flags & PP_CISCO)) { 4809 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4810 ifp->if_xname); 4811 sp->pp_alivecnt = 0; 4812 4813 /* we are down, close all open protocols */ 4814 lcp.Close(sp); 4815 4816 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4817 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4818 4819 /* Close connection immediately, completition of this 4820 * will summon the magic needed to reestablish it. */ 4821 if (sp->pp_tlf) 4822 sp->pp_tlf(sp); 4823 continue; 4824 } 4825 } 4826 if (sp->pp_alivecnt < sp->pp_maxalive) 4827 ++sp->pp_alivecnt; 4828 if (sp->pp_flags & PP_CISCO) 4829 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4830 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4831 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4832 int32_t nmagic = htonl(sp->lcp.magic); 4833 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4834 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4835 sp->lcp.echoid, 4, &nmagic); 4836 } 4837 } 4838 splx(s); 4839 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4840 } 4841 4842 #ifdef INET 4843 /* 4844 * Get both IP addresses. 4845 */ 4846 static void 4847 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4848 { 4849 struct ifnet *ifp = &sp->pp_if; 4850 struct ifaddr *ifa; 4851 struct sockaddr_in *si, *sm; 4852 u_int32_t ssrc, ddst; 4853 4854 sm = NULL; 4855 ssrc = ddst = 0; 4856 /* 4857 * Pick the first AF_INET address from the list, 4858 * aliases don't make any sense on a p2p link anyway. 4859 */ 4860 si = 0; 4861 IFADDR_FOREACH(ifa, ifp) { 4862 if (ifa->ifa_addr->sa_family == AF_INET) { 4863 si = (struct sockaddr_in *)ifa->ifa_addr; 4864 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4865 if (si) 4866 break; 4867 } 4868 } 4869 if (ifa) { 4870 if (si && si->sin_addr.s_addr) { 4871 ssrc = si->sin_addr.s_addr; 4872 if (srcmask) 4873 *srcmask = ntohl(sm->sin_addr.s_addr); 4874 } 4875 4876 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4877 if (si && si->sin_addr.s_addr) 4878 ddst = si->sin_addr.s_addr; 4879 } 4880 4881 if (dst) *dst = ntohl(ddst); 4882 if (src) *src = ntohl(ssrc); 4883 } 4884 4885 /* 4886 * Set IP addresses. Must be called at splnet. 4887 * If an address is 0, leave it the way it is. 4888 */ 4889 static void 4890 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4891 { 4892 STDDCL; 4893 struct ifaddr *ifa; 4894 struct sockaddr_in *si, *dest; 4895 4896 /* 4897 * Pick the first AF_INET address from the list, 4898 * aliases don't make any sense on a p2p link anyway. 4899 */ 4900 4901 IFADDR_FOREACH(ifa, ifp) { 4902 if (ifa->ifa_addr->sa_family == AF_INET) { 4903 si = (struct sockaddr_in *)ifa->ifa_addr; 4904 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4905 goto found; 4906 } 4907 } 4908 return; 4909 4910 found: 4911 { 4912 int error; 4913 struct sockaddr_in new_sin = *si; 4914 struct sockaddr_in new_dst = *dest; 4915 4916 /* 4917 * Scrub old routes now instead of calling in_ifinit with 4918 * scrub=1, because we may change the dstaddr 4919 * before the call to in_ifinit. 4920 */ 4921 in_ifscrub(ifp, ifatoia(ifa)); 4922 4923 if (myaddr != 0) 4924 new_sin.sin_addr.s_addr = htonl(myaddr); 4925 if (hisaddr != 0) { 4926 new_dst.sin_addr.s_addr = htonl(hisaddr); 4927 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4928 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4929 *dest = new_dst; /* fix dstaddr in place */ 4930 } 4931 } 4932 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4933 if (debug && error) 4934 { 4935 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4936 " failed, error=%d\n", ifp->if_xname, error); 4937 } 4938 #ifdef PFIL_HOOKS 4939 if (!error) 4940 (void)pfil_run_hooks(&if_pfil, 4941 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4942 #endif 4943 } 4944 } 4945 4946 /* 4947 * Clear IP addresses. Must be called at splnet. 4948 */ 4949 static void 4950 sppp_clear_ip_addrs(struct sppp *sp) 4951 { 4952 struct ifnet *ifp = &sp->pp_if; 4953 struct ifaddr *ifa; 4954 struct sockaddr_in *si, *dest; 4955 4956 u_int32_t remote; 4957 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4958 remote = sp->ipcp.saved_hisaddr; 4959 else 4960 sppp_get_ip_addrs(sp, 0, &remote, 0); 4961 4962 /* 4963 * Pick the first AF_INET address from the list, 4964 * aliases don't make any sense on a p2p link anyway. 4965 */ 4966 4967 IFADDR_FOREACH(ifa, ifp) { 4968 if (ifa->ifa_addr->sa_family == AF_INET) { 4969 si = (struct sockaddr_in *)ifa->ifa_addr; 4970 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4971 goto found; 4972 } 4973 } 4974 return; 4975 4976 found: 4977 { 4978 struct sockaddr_in new_sin = *si; 4979 4980 in_ifscrub(ifp, ifatoia(ifa)); 4981 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4982 new_sin.sin_addr.s_addr = 0; 4983 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4984 /* replace peer addr in place */ 4985 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4986 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4987 #ifdef PFIL_HOOKS 4988 (void)pfil_run_hooks(&if_pfil, 4989 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4990 #endif 4991 } 4992 } 4993 #endif 4994 4995 #ifdef INET6 4996 /* 4997 * Get both IPv6 addresses. 4998 */ 4999 static void 5000 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5001 struct in6_addr *srcmask) 5002 { 5003 struct ifnet *ifp = &sp->pp_if; 5004 struct ifaddr *ifa; 5005 struct sockaddr_in6 *si, *sm; 5006 struct in6_addr ssrc, ddst; 5007 5008 sm = NULL; 5009 memset(&ssrc, 0, sizeof(ssrc)); 5010 memset(&ddst, 0, sizeof(ddst)); 5011 /* 5012 * Pick the first link-local AF_INET6 address from the list, 5013 * aliases don't make any sense on a p2p link anyway. 5014 */ 5015 si = 0; 5016 IFADDR_FOREACH(ifa, ifp) 5017 if (ifa->ifa_addr->sa_family == AF_INET6) { 5018 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5019 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5020 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5021 break; 5022 } 5023 if (ifa) { 5024 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5025 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 5026 if (srcmask) { 5027 bcopy(&sm->sin6_addr, srcmask, 5028 sizeof(*srcmask)); 5029 } 5030 } 5031 5032 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5033 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5034 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 5035 } 5036 5037 if (dst) 5038 bcopy(&ddst, dst, sizeof(*dst)); 5039 if (src) 5040 bcopy(&ssrc, src, sizeof(*src)); 5041 } 5042 5043 #ifdef IPV6CP_MYIFID_DYN 5044 /* 5045 * Generate random ifid. 5046 */ 5047 static void 5048 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5049 { 5050 /* TBD */ 5051 } 5052 5053 /* 5054 * Set my IPv6 address. Must be called at splnet. 5055 */ 5056 static void 5057 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5058 { 5059 STDDCL; 5060 struct ifaddr *ifa; 5061 struct sockaddr_in6 *sin6; 5062 5063 /* 5064 * Pick the first link-local AF_INET6 address from the list, 5065 * aliases don't make any sense on a p2p link anyway. 5066 */ 5067 5068 sin6 = NULL; 5069 IFADDR_FOREACH(ifa, ifp) 5070 { 5071 if (ifa->ifa_addr->sa_family == AF_INET6) 5072 { 5073 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5074 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5075 break; 5076 } 5077 } 5078 5079 if (ifa && sin6) 5080 { 5081 int error; 5082 struct sockaddr_in6 new_sin6 = *sin6; 5083 5084 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 5085 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5086 if (debug && error) 5087 { 5088 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5089 " failed, error=%d\n", ifp->if_xname, error); 5090 } 5091 #ifdef PFIL_HOOKS 5092 if (!error) 5093 (void)pfil_run_hooks(&if_pfil, 5094 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5095 #endif 5096 } 5097 } 5098 #endif 5099 5100 /* 5101 * Suggest a candidate address to be used by peer. 5102 */ 5103 static void 5104 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5105 { 5106 struct in6_addr myaddr; 5107 struct timeval tv; 5108 5109 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5110 5111 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5112 microtime(&tv); 5113 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5114 myaddr.s6_addr[14] ^= 0xff; 5115 myaddr.s6_addr[15] ^= 0xff; 5116 } else { 5117 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5118 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5119 } 5120 if (suggest) 5121 bcopy(&myaddr, suggest, sizeof(myaddr)); 5122 } 5123 #endif /*INET6*/ 5124 5125 /* 5126 * Process ioctl requests specific to the PPP interface. 5127 * Permissions have already been checked. 5128 */ 5129 static int 5130 sppp_params(struct sppp *sp, int cmd, void *data) 5131 { 5132 switch (cmd) { 5133 case SPPPGETAUTHCFG: 5134 { 5135 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5136 int error; 5137 size_t len; 5138 5139 cfg->myauthflags = sp->myauth.flags; 5140 cfg->hisauthflags = sp->hisauth.flags; 5141 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5142 cfg->hisauth = 0; 5143 if (sp->hisauth.proto) 5144 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5145 cfg->myauth = 0; 5146 if (sp->myauth.proto) 5147 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5148 if (cfg->myname_length == 0) { 5149 if (sp->myauth.name != NULL) 5150 cfg->myname_length = sp->myauth.name_len + 1; 5151 } else { 5152 if (sp->myauth.name == NULL) { 5153 cfg->myname_length = 0; 5154 } else { 5155 len = sp->myauth.name_len + 1; 5156 if (cfg->myname_length < len) 5157 return (ENAMETOOLONG); 5158 error = copyout(sp->myauth.name, cfg->myname, len); 5159 if (error) return error; 5160 } 5161 } 5162 if (cfg->hisname_length == 0) { 5163 if (sp->hisauth.name != NULL) 5164 cfg->hisname_length = sp->hisauth.name_len + 1; 5165 } else { 5166 if (sp->hisauth.name == NULL) { 5167 cfg->hisname_length = 0; 5168 } else { 5169 len = sp->hisauth.name_len + 1; 5170 if (cfg->hisname_length < len) 5171 return (ENAMETOOLONG); 5172 error = copyout(sp->hisauth.name, cfg->hisname, len); 5173 if (error) return error; 5174 } 5175 } 5176 } 5177 break; 5178 case SPPPSETAUTHCFG: 5179 { 5180 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5181 int error; 5182 5183 if (sp->myauth.name) { 5184 free(sp->myauth.name, M_DEVBUF); 5185 sp->myauth.name = NULL; 5186 } 5187 if (sp->myauth.secret) { 5188 free(sp->myauth.secret, M_DEVBUF); 5189 sp->myauth.secret = NULL; 5190 } 5191 if (sp->hisauth.name) { 5192 free(sp->hisauth.name, M_DEVBUF); 5193 sp->hisauth.name = NULL; 5194 } 5195 if (sp->hisauth.secret) { 5196 free(sp->hisauth.secret, M_DEVBUF); 5197 sp->hisauth.secret = NULL; 5198 } 5199 5200 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5201 if (cfg->hisname_length >= MCLBYTES) 5202 return (ENAMETOOLONG); 5203 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5204 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5205 if (error) { 5206 free(sp->hisauth.name, M_DEVBUF); 5207 sp->hisauth.name = NULL; 5208 return error; 5209 } 5210 sp->hisauth.name_len = cfg->hisname_length - 1; 5211 sp->hisauth.name[sp->hisauth.name_len] = 0; 5212 } 5213 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5214 if (cfg->hissecret_length >= MCLBYTES) 5215 return (ENAMETOOLONG); 5216 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5217 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5218 if (error) { 5219 free(sp->hisauth.secret, M_DEVBUF); 5220 sp->hisauth.secret = NULL; 5221 return error; 5222 } 5223 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5224 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5225 } 5226 if (cfg->myname != NULL && cfg->myname_length > 0) { 5227 if (cfg->myname_length >= MCLBYTES) 5228 return (ENAMETOOLONG); 5229 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5230 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5231 if (error) { 5232 free(sp->myauth.name, M_DEVBUF); 5233 sp->myauth.name = NULL; 5234 return error; 5235 } 5236 sp->myauth.name_len = cfg->myname_length - 1; 5237 sp->myauth.name[sp->myauth.name_len] = 0; 5238 } 5239 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5240 if (cfg->mysecret_length >= MCLBYTES) 5241 return (ENAMETOOLONG); 5242 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5243 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5244 if (error) { 5245 free(sp->myauth.secret, M_DEVBUF); 5246 sp->myauth.secret = NULL; 5247 return error; 5248 } 5249 sp->myauth.secret_len = cfg->mysecret_length - 1; 5250 sp->myauth.secret[sp->myauth.secret_len] = 0; 5251 } 5252 sp->myauth.flags = cfg->myauthflags; 5253 if (cfg->myauth) 5254 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5255 sp->hisauth.flags = cfg->hisauthflags; 5256 if (cfg->hisauth) 5257 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5258 sp->pp_auth_failures = 0; 5259 if (sp->hisauth.proto != 0) 5260 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5261 else 5262 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5263 } 5264 break; 5265 case SPPPGETLCPCFG: 5266 { 5267 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5268 lcpp->lcp_timeout = sp->lcp.timeout; 5269 } 5270 break; 5271 case SPPPSETLCPCFG: 5272 { 5273 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5274 sp->lcp.timeout = lcpp->lcp_timeout; 5275 } 5276 break; 5277 case SPPPGETSTATUS: 5278 { 5279 struct spppstatus *status = (struct spppstatus *)data; 5280 status->phase = sp->pp_phase; 5281 } 5282 break; 5283 case SPPPGETSTATUSNCP: 5284 { 5285 struct spppstatusncp *status = (struct spppstatusncp *)data; 5286 status->phase = sp->pp_phase; 5287 status->ncpup = sppp_ncp_check(sp); 5288 } 5289 break; 5290 case SPPPGETIDLETO: 5291 { 5292 struct spppidletimeout *to = (struct spppidletimeout *)data; 5293 to->idle_seconds = sp->pp_idle_timeout; 5294 } 5295 break; 5296 case SPPPSETIDLETO: 5297 { 5298 struct spppidletimeout *to = (struct spppidletimeout *)data; 5299 sp->pp_idle_timeout = to->idle_seconds; 5300 } 5301 break; 5302 case SPPPSETAUTHFAILURE: 5303 { 5304 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5305 sp->pp_max_auth_fail = afsettings->max_failures; 5306 sp->pp_auth_failures = 0; 5307 } 5308 break; 5309 case SPPPGETAUTHFAILURES: 5310 { 5311 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5312 stats->auth_failures = sp->pp_auth_failures; 5313 stats->max_failures = sp->pp_max_auth_fail; 5314 } 5315 break; 5316 case SPPPSETDNSOPTS: 5317 { 5318 struct spppdnssettings *req = (struct spppdnssettings *)data; 5319 sp->query_dns = req->query_dns & 3; 5320 } 5321 break; 5322 case SPPPGETDNSOPTS: 5323 { 5324 struct spppdnssettings *req = (struct spppdnssettings *)data; 5325 req->query_dns = sp->query_dns; 5326 } 5327 break; 5328 case SPPPGETDNSADDRS: 5329 { 5330 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5331 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5332 } 5333 break; 5334 case SPPPGETKEEPALIVE: 5335 { 5336 struct spppkeepalivesettings *settings = 5337 (struct spppkeepalivesettings*)data; 5338 settings->maxalive = sp->pp_maxalive; 5339 settings->max_noreceive = sp->pp_max_noreceive; 5340 } 5341 break; 5342 case SPPPSETKEEPALIVE: 5343 { 5344 struct spppkeepalivesettings *settings = 5345 (struct spppkeepalivesettings*)data; 5346 sp->pp_maxalive = settings->maxalive; 5347 sp->pp_max_noreceive = settings->max_noreceive; 5348 } 5349 break; 5350 default: 5351 return (EINVAL); 5352 } 5353 5354 return (0); 5355 } 5356 5357 static void 5358 sppp_phase_network(struct sppp *sp) 5359 { 5360 STDDCL; 5361 int i; 5362 u_int32_t mask; 5363 5364 sp->pp_phase = SPPP_PHASE_NETWORK; 5365 5366 if (debug) 5367 { 5368 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5369 sppp_phase_name(sp->pp_phase)); 5370 } 5371 5372 /* Notify NCPs now. */ 5373 for (i = 0; i < IDX_COUNT; i++) 5374 if ((cps[i])->flags & CP_NCP) 5375 (cps[i])->Open(sp); 5376 5377 /* Send Up events to all NCPs. */ 5378 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5379 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5380 (cps[i])->Up(sp); 5381 5382 /* if no NCP is starting, all this was in vain, close down */ 5383 sppp_lcp_check_and_close(sp); 5384 } 5385 5386 5387 static const char * 5388 sppp_cp_type_name(u_char type) 5389 { 5390 static char buf[12]; 5391 switch (type) { 5392 case CONF_REQ: return "conf-req"; 5393 case CONF_ACK: return "conf-ack"; 5394 case CONF_NAK: return "conf-nak"; 5395 case CONF_REJ: return "conf-rej"; 5396 case TERM_REQ: return "term-req"; 5397 case TERM_ACK: return "term-ack"; 5398 case CODE_REJ: return "code-rej"; 5399 case PROTO_REJ: return "proto-rej"; 5400 case ECHO_REQ: return "echo-req"; 5401 case ECHO_REPLY: return "echo-reply"; 5402 case DISC_REQ: return "discard-req"; 5403 } 5404 snprintf(buf, sizeof(buf), "0x%x", type); 5405 return buf; 5406 } 5407 5408 static const char * 5409 sppp_auth_type_name(u_short proto, u_char type) 5410 { 5411 static char buf[12]; 5412 switch (proto) { 5413 case PPP_CHAP: 5414 switch (type) { 5415 case CHAP_CHALLENGE: return "challenge"; 5416 case CHAP_RESPONSE: return "response"; 5417 case CHAP_SUCCESS: return "success"; 5418 case CHAP_FAILURE: return "failure"; 5419 } 5420 case PPP_PAP: 5421 switch (type) { 5422 case PAP_REQ: return "req"; 5423 case PAP_ACK: return "ack"; 5424 case PAP_NAK: return "nak"; 5425 } 5426 } 5427 snprintf(buf, sizeof(buf), "0x%x", type); 5428 return buf; 5429 } 5430 5431 static const char * 5432 sppp_lcp_opt_name(u_char opt) 5433 { 5434 static char buf[12]; 5435 switch (opt) { 5436 case LCP_OPT_MRU: return "mru"; 5437 case LCP_OPT_ASYNC_MAP: return "async-map"; 5438 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5439 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5440 case LCP_OPT_MAGIC: return "magic"; 5441 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5442 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5443 } 5444 snprintf(buf, sizeof(buf), "0x%x", opt); 5445 return buf; 5446 } 5447 5448 static const char * 5449 sppp_ipcp_opt_name(u_char opt) 5450 { 5451 static char buf[12]; 5452 switch (opt) { 5453 case IPCP_OPT_ADDRESSES: return "addresses"; 5454 case IPCP_OPT_COMPRESSION: return "compression"; 5455 case IPCP_OPT_ADDRESS: return "address"; 5456 } 5457 snprintf(buf, sizeof(buf), "0x%x", opt); 5458 return buf; 5459 } 5460 5461 #ifdef INET6 5462 static const char * 5463 sppp_ipv6cp_opt_name(u_char opt) 5464 { 5465 static char buf[12]; 5466 switch (opt) { 5467 case IPV6CP_OPT_IFID: return "ifid"; 5468 case IPV6CP_OPT_COMPRESSION: return "compression"; 5469 } 5470 snprintf(buf, sizeof(buf), "0x%x", opt); 5471 return buf; 5472 } 5473 #endif 5474 5475 static const char * 5476 sppp_state_name(int state) 5477 { 5478 switch (state) { 5479 case STATE_INITIAL: return "initial"; 5480 case STATE_STARTING: return "starting"; 5481 case STATE_CLOSED: return "closed"; 5482 case STATE_STOPPED: return "stopped"; 5483 case STATE_CLOSING: return "closing"; 5484 case STATE_STOPPING: return "stopping"; 5485 case STATE_REQ_SENT: return "req-sent"; 5486 case STATE_ACK_RCVD: return "ack-rcvd"; 5487 case STATE_ACK_SENT: return "ack-sent"; 5488 case STATE_OPENED: return "opened"; 5489 } 5490 return "illegal"; 5491 } 5492 5493 static const char * 5494 sppp_phase_name(int phase) 5495 { 5496 switch (phase) { 5497 case SPPP_PHASE_DEAD: return "dead"; 5498 case SPPP_PHASE_ESTABLISH: return "establish"; 5499 case SPPP_PHASE_TERMINATE: return "terminate"; 5500 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5501 case SPPP_PHASE_NETWORK: return "network"; 5502 } 5503 return "illegal"; 5504 } 5505 5506 static const char * 5507 sppp_proto_name(u_short proto) 5508 { 5509 static char buf[12]; 5510 switch (proto) { 5511 case PPP_LCP: return "lcp"; 5512 case PPP_IPCP: return "ipcp"; 5513 case PPP_PAP: return "pap"; 5514 case PPP_CHAP: return "chap"; 5515 case PPP_IPV6CP: return "ipv6cp"; 5516 } 5517 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5518 return buf; 5519 } 5520 5521 static void 5522 sppp_print_bytes(const u_char *p, u_short len) 5523 { 5524 addlog(" %02x", *p++); 5525 while (--len > 0) 5526 addlog("-%02x", *p++); 5527 } 5528 5529 static void 5530 sppp_print_string(const char *p, u_short len) 5531 { 5532 u_char c; 5533 5534 while (len-- > 0) { 5535 c = *p++; 5536 /* 5537 * Print only ASCII chars directly. RFC 1994 recommends 5538 * using only them, but we don't rely on it. */ 5539 if (c < ' ' || c > '~') 5540 addlog("\\x%x", c); 5541 else 5542 addlog("%c", c); 5543 } 5544 } 5545 5546 static const char * 5547 sppp_dotted_quad(u_int32_t addr) 5548 { 5549 static char s[16]; 5550 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5551 (int)((addr >> 24) & 0xff), 5552 (int)((addr >> 16) & 0xff), 5553 (int)((addr >> 8) & 0xff), 5554 (int)(addr & 0xff)); 5555 return s; 5556 } 5557 5558 /* a dummy, used to drop uninteresting events */ 5559 static void 5560 sppp_null(struct sppp *unused) 5561 { 5562 /* do just nothing */ 5563 } 5564 /* 5565 * This file is large. Tell emacs to highlight it nevertheless. 5566 * 5567 * Local Variables: 5568 * hilit-auto-highlight-maxout: 120000 5569 * End: 5570 */ 5571
Indexes created Fri Sep 26 08:10:20 GMT 2025