if_spppsubr.c revision 1.127.4.1
1 /* $NetBSD: if_spppsubr.c,v 1.127.4.1 2014/08/10 06:56:15 tls 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 1.127.4.1 2014/08/10 06:56:15 tls Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_modular.h" 50 #include "opt_compat_netbsd.h" 51 #endif 52 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 69 #include <net/if.h> 70 #include <net/netisr.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/ppp_defs.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip.h> 80 #include <netinet/tcp.h> 81 #endif 82 #include <net/ethertypes.h> 83 84 #ifdef INET6 85 #include <netinet6/scope6_var.h> 86 #endif 87 88 #ifdef IPX 89 #include <netipx/ipx.h> 90 #include <netipx/ipx_if.h> 91 #endif 92 93 #include <net/if_sppp.h> 94 #include <net/if_spppvar.h> 95 96 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 97 #define LOOPALIVECNT 3 /* loopback detection tries */ 98 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 99 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 100 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 101 102 /* 103 * Interface flags that can be set in an ifconfig command. 104 * 105 * Setting link0 will make the link passive, i.e. it will be marked 106 * as being administrative openable, but won't be opened to begin 107 * with. Incoming calls will be answered, or subsequent calls with 108 * -link1 will cause the administrative open of the LCP layer. 109 * 110 * Setting link1 will cause the link to auto-dial only as packets 111 * arrive to be sent. 112 * 113 * Setting IFF_DEBUG will syslog the option negotiation and state 114 * transitions at level kern.debug. Note: all logs consistently look 115 * like 116 * 117 * <if-name><unit>: <proto-name> <additional info...> 118 * 119 * with <if-name><unit> being something like "bppp0", and <proto-name> 120 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 121 */ 122 123 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 124 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 125 126 #define CONF_REQ 1 /* PPP configure request */ 127 #define CONF_ACK 2 /* PPP configure acknowledge */ 128 #define CONF_NAK 3 /* PPP configure negative ack */ 129 #define CONF_REJ 4 /* PPP configure reject */ 130 #define TERM_REQ 5 /* PPP terminate request */ 131 #define TERM_ACK 6 /* PPP terminate acknowledge */ 132 #define CODE_REJ 7 /* PPP code reject */ 133 #define PROTO_REJ 8 /* PPP protocol reject */ 134 #define ECHO_REQ 9 /* PPP echo request */ 135 #define ECHO_REPLY 10 /* PPP echo reply */ 136 #define DISC_REQ 11 /* PPP discard request */ 137 138 #define LCP_OPT_MRU 1 /* maximum receive unit */ 139 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 140 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 141 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 142 #define LCP_OPT_MAGIC 5 /* magic number */ 143 #define LCP_OPT_RESERVED 6 /* reserved */ 144 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 145 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 146 147 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 148 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 149 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 150 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 151 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 152 153 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 154 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 155 156 #define PAP_REQ 1 /* PAP name/password request */ 157 #define PAP_ACK 2 /* PAP acknowledge */ 158 #define PAP_NAK 3 /* PAP fail */ 159 160 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 161 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 162 #define CHAP_SUCCESS 3 /* CHAP response ok */ 163 #define CHAP_FAILURE 4 /* CHAP response failed */ 164 165 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 166 167 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 168 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 169 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 170 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 171 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 172 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 173 174 /* states are named and numbered according to RFC 1661 */ 175 #define STATE_INITIAL 0 176 #define STATE_STARTING 1 177 #define STATE_CLOSED 2 178 #define STATE_STOPPED 3 179 #define STATE_CLOSING 4 180 #define STATE_STOPPING 5 181 #define STATE_REQ_SENT 6 182 #define STATE_ACK_RCVD 7 183 #define STATE_ACK_SENT 8 184 #define STATE_OPENED 9 185 186 struct ppp_header { 187 uint8_t address; 188 uint8_t control; 189 uint16_t protocol; 190 } __packed; 191 #define PPP_HEADER_LEN sizeof (struct ppp_header) 192 193 struct lcp_header { 194 uint8_t type; 195 uint8_t ident; 196 uint16_t len; 197 } __packed; 198 #define LCP_HEADER_LEN sizeof (struct lcp_header) 199 200 struct cisco_packet { 201 uint32_t type; 202 uint32_t par1; 203 uint32_t par2; 204 uint16_t rel; 205 uint16_t time0; 206 uint16_t time1; 207 } __packed; 208 #define CISCO_PACKET_LEN 18 209 210 /* 211 * We follow the spelling and capitalization of RFC 1661 here, to make 212 * it easier comparing with the standard. Please refer to this RFC in 213 * case you can't make sense out of these abbreviation; it will also 214 * explain the semantics related to the various events and actions. 215 */ 216 struct cp { 217 u_short proto; /* PPP control protocol number */ 218 u_char protoidx; /* index into state table in struct sppp */ 219 u_char flags; 220 #define CP_LCP 0x01 /* this is the LCP */ 221 #define CP_AUTH 0x02 /* this is an authentication protocol */ 222 #define CP_NCP 0x04 /* this is a NCP */ 223 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 224 const char *name; /* name of this control protocol */ 225 /* event handlers */ 226 void (*Up)(struct sppp *sp); 227 void (*Down)(struct sppp *sp); 228 void (*Open)(struct sppp *sp); 229 void (*Close)(struct sppp *sp); 230 void (*TO)(void *sp); 231 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 232 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 233 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 234 /* actions */ 235 void (*tlu)(struct sppp *sp); 236 void (*tld)(struct sppp *sp); 237 void (*tls)(struct sppp *sp); 238 void (*tlf)(struct sppp *sp); 239 void (*scr)(struct sppp *sp); 240 }; 241 242 static struct sppp *spppq; 243 static callout_t keepalive_ch; 244 245 #ifdef INET 246 /* 247 * The following disgusting hack gets around the problem that IP TOS 248 * can't be set yet. We want to put "interactive" traffic on a high 249 * priority queue. To decide if traffic is interactive, we check that 250 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 251 * 252 * XXX is this really still necessary? - joerg - 253 */ 254 static u_short interactive_ports[8] = { 255 0, 513, 0, 0, 256 0, 21, 0, 23, 257 }; 258 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 259 #endif 260 261 /* almost every function needs these */ 262 #define STDDCL \ 263 struct ifnet *ifp = &sp->pp_if; \ 264 int debug = ifp->if_flags & IFF_DEBUG 265 266 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 267 const struct sockaddr *dst, struct rtentry *rt); 268 269 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 270 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 271 272 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 273 struct mbuf *m); 274 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 275 u_char ident, u_short len, void *data); 276 /* static void sppp_cp_timeout(void *arg); */ 277 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 278 int newstate); 279 static void sppp_auth_send(const struct cp *cp, 280 struct sppp *sp, unsigned int type, unsigned int id, 281 ...); 282 283 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 284 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 285 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 286 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 288 289 static void sppp_null(struct sppp *sp); 290 291 static void sppp_lcp_init(struct sppp *sp); 292 static void sppp_lcp_up(struct sppp *sp); 293 static void sppp_lcp_down(struct sppp *sp); 294 static void sppp_lcp_open(struct sppp *sp); 295 static void sppp_lcp_close(struct sppp *sp); 296 static void sppp_lcp_TO(void *sp); 297 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 298 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 299 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 300 static void sppp_lcp_tlu(struct sppp *sp); 301 static void sppp_lcp_tld(struct sppp *sp); 302 static void sppp_lcp_tls(struct sppp *sp); 303 static void sppp_lcp_tlf(struct sppp *sp); 304 static void sppp_lcp_scr(struct sppp *sp); 305 static void sppp_lcp_check_and_close(struct sppp *sp); 306 static int sppp_ncp_check(struct sppp *sp); 307 308 static void sppp_ipcp_init(struct sppp *sp); 309 static void sppp_ipcp_up(struct sppp *sp); 310 static void sppp_ipcp_down(struct sppp *sp); 311 static void sppp_ipcp_open(struct sppp *sp); 312 static void sppp_ipcp_close(struct sppp *sp); 313 static void sppp_ipcp_TO(void *sp); 314 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 315 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 316 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 317 static void sppp_ipcp_tlu(struct sppp *sp); 318 static void sppp_ipcp_tld(struct sppp *sp); 319 static void sppp_ipcp_tls(struct sppp *sp); 320 static void sppp_ipcp_tlf(struct sppp *sp); 321 static void sppp_ipcp_scr(struct sppp *sp); 322 323 static void sppp_ipv6cp_init(struct sppp *sp); 324 static void sppp_ipv6cp_up(struct sppp *sp); 325 static void sppp_ipv6cp_down(struct sppp *sp); 326 static void sppp_ipv6cp_open(struct sppp *sp); 327 static void sppp_ipv6cp_close(struct sppp *sp); 328 static void sppp_ipv6cp_TO(void *sp); 329 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 330 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 332 static void sppp_ipv6cp_tlu(struct sppp *sp); 333 static void sppp_ipv6cp_tld(struct sppp *sp); 334 static void sppp_ipv6cp_tls(struct sppp *sp); 335 static void sppp_ipv6cp_tlf(struct sppp *sp); 336 static void sppp_ipv6cp_scr(struct sppp *sp); 337 338 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 339 static void sppp_pap_init(struct sppp *sp); 340 static void sppp_pap_open(struct sppp *sp); 341 static void sppp_pap_close(struct sppp *sp); 342 static void sppp_pap_TO(void *sp); 343 static void sppp_pap_my_TO(void *sp); 344 static void sppp_pap_tlu(struct sppp *sp); 345 static void sppp_pap_tld(struct sppp *sp); 346 static void sppp_pap_scr(struct sppp *sp); 347 348 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 349 static void sppp_chap_init(struct sppp *sp); 350 static void sppp_chap_open(struct sppp *sp); 351 static void sppp_chap_close(struct sppp *sp); 352 static void sppp_chap_TO(void *sp); 353 static void sppp_chap_tlu(struct sppp *sp); 354 static void sppp_chap_tld(struct sppp *sp); 355 static void sppp_chap_scr(struct sppp *sp); 356 357 static const char *sppp_auth_type_name(u_short proto, u_char type); 358 static const char *sppp_cp_type_name(u_char type); 359 static const char *sppp_dotted_quad(uint32_t addr); 360 static const char *sppp_ipcp_opt_name(u_char opt); 361 #ifdef INET6 362 static const char *sppp_ipv6cp_opt_name(u_char opt); 363 #endif 364 static const char *sppp_lcp_opt_name(u_char opt); 365 static const char *sppp_phase_name(int phase); 366 static const char *sppp_proto_name(u_short proto); 367 static const char *sppp_state_name(int state); 368 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 369 #ifdef INET 370 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 371 uint32_t *srcmask); 372 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 373 static void sppp_clear_ip_addrs(struct sppp *sp); 374 #endif 375 static void sppp_keepalive(void *dummy); 376 static void sppp_phase_network(struct sppp *sp); 377 static void sppp_print_bytes(const u_char *p, u_short len); 378 static void sppp_print_string(const char *p, u_short len); 379 #ifdef INET6 380 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 381 struct in6_addr *dst, struct in6_addr *srcmask); 382 #ifdef IPV6CP_MYIFID_DYN 383 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 384 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 #endif 386 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 387 #endif 388 389 /* our control protocol descriptors */ 390 static const struct cp lcp = { 391 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 392 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 393 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 394 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 395 sppp_lcp_scr 396 }; 397 398 static const struct cp ipcp = { 399 PPP_IPCP, IDX_IPCP, 400 #ifdef INET 401 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 402 #else 403 0, 404 #endif 405 "ipcp", 406 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 407 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 408 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 409 sppp_ipcp_scr 410 }; 411 412 static const struct cp ipv6cp = { 413 PPP_IPV6CP, IDX_IPV6CP, 414 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 415 CP_NCP, 416 #else 417 0, 418 #endif 419 "ipv6cp", 420 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 421 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 422 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 423 sppp_ipv6cp_scr 424 }; 425 426 static const struct cp pap = { 427 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 428 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 429 sppp_pap_TO, 0, 0, 0, 430 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 431 sppp_pap_scr 432 }; 433 434 static const struct cp chap = { 435 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 436 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 437 sppp_chap_TO, 0, 0, 0, 438 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 439 sppp_chap_scr 440 }; 441 442 static const struct cp *cps[IDX_COUNT] = { 443 &lcp, /* IDX_LCP */ 444 &ipcp, /* IDX_IPCP */ 445 &ipv6cp, /* IDX_IPV6CP */ 446 &pap, /* IDX_PAP */ 447 &chap, /* IDX_CHAP */ 448 }; 449 450 451 void spppattach(int); 452 void 453 /*ARGSUSED*/ 454 spppattach(int count) 455 { 456 } 457 458 /* 459 * Exported functions, comprising our interface to the lower layer. 460 */ 461 462 /* 463 * Process the received packet. 464 */ 465 void 466 sppp_input(struct ifnet *ifp, struct mbuf *m) 467 { 468 struct ppp_header *h = NULL; 469 pktqueue_t *pktq = NULL; 470 struct ifqueue *inq = NULL; 471 uint16_t protocol; 472 int s; 473 struct sppp *sp = (struct sppp *)ifp; 474 int debug = ifp->if_flags & IFF_DEBUG; 475 int isr = 0; 476 477 if (ifp->if_flags & IFF_UP) { 478 /* Count received bytes, add hardware framing */ 479 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 480 /* Note time of last receive */ 481 sp->pp_last_receive = time_uptime; 482 } 483 484 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 485 /* Too small packet, drop it. */ 486 if (debug) 487 log(LOG_DEBUG, 488 "%s: input packet is too small, %d bytes\n", 489 ifp->if_xname, m->m_pkthdr.len); 490 drop: 491 ++ifp->if_ierrors; 492 ++ifp->if_iqdrops; 493 m_freem(m); 494 return; 495 } 496 497 if (sp->pp_flags & PP_NOFRAMING) { 498 memcpy(&protocol, mtod(m, void *), 2); 499 protocol = ntohs(protocol); 500 m_adj(m, 2); 501 } else { 502 503 /* Get PPP header. */ 504 h = mtod(m, struct ppp_header *); 505 m_adj(m, PPP_HEADER_LEN); 506 507 switch (h->address) { 508 case PPP_ALLSTATIONS: 509 if (h->control != PPP_UI) 510 goto invalid; 511 if (sp->pp_flags & PP_CISCO) { 512 if (debug) 513 log(LOG_DEBUG, 514 "%s: PPP packet in Cisco mode " 515 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 516 ifp->if_xname, 517 h->address, h->control, ntohs(h->protocol)); 518 goto drop; 519 } 520 break; 521 case CISCO_MULTICAST: 522 case CISCO_UNICAST: 523 /* Don't check the control field here (RFC 1547). */ 524 if (! (sp->pp_flags & PP_CISCO)) { 525 if (debug) 526 log(LOG_DEBUG, 527 "%s: Cisco packet in PPP mode " 528 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 529 ifp->if_xname, 530 h->address, h->control, ntohs(h->protocol)); 531 goto drop; 532 } 533 switch (ntohs(h->protocol)) { 534 default: 535 ++ifp->if_noproto; 536 goto invalid; 537 case CISCO_KEEPALIVE: 538 sppp_cisco_input((struct sppp *) ifp, m); 539 m_freem(m); 540 return; 541 #ifdef INET 542 case ETHERTYPE_IP: 543 pktq = ip_pktq; 544 break; 545 #endif 546 #ifdef INET6 547 case ETHERTYPE_IPV6: 548 pktq = ip6_pktq; 549 break; 550 #endif 551 #ifdef IPX 552 case ETHERTYPE_IPX: 553 isr = NETISR_IPX; 554 inq = &ipxintrq; 555 break; 556 #endif 557 } 558 goto queue_pkt; 559 default: /* Invalid PPP packet. */ 560 invalid: 561 if (debug) 562 log(LOG_DEBUG, 563 "%s: invalid input packet " 564 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 565 ifp->if_xname, 566 h->address, h->control, ntohs(h->protocol)); 567 goto drop; 568 } 569 protocol = ntohs(h->protocol); 570 } 571 572 switch (protocol) { 573 default: 574 if (sp->state[IDX_LCP] == STATE_OPENED) { 575 uint16_t prot = htons(protocol); 576 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 577 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 578 &prot); 579 } 580 if (debug) 581 log(LOG_DEBUG, 582 "%s: invalid input protocol " 583 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 584 ++ifp->if_noproto; 585 goto drop; 586 case PPP_LCP: 587 sppp_cp_input(&lcp, sp, m); 588 m_freem(m); 589 return; 590 case PPP_PAP: 591 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 592 sppp_pap_input(sp, m); 593 m_freem(m); 594 return; 595 case PPP_CHAP: 596 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 597 sppp_chap_input(sp, m); 598 m_freem(m); 599 return; 600 #ifdef INET 601 case PPP_IPCP: 602 if (sp->pp_phase == SPPP_PHASE_NETWORK) 603 sppp_cp_input(&ipcp, sp, m); 604 m_freem(m); 605 return; 606 case PPP_IP: 607 if (sp->state[IDX_IPCP] == STATE_OPENED) { 608 sp->pp_last_activity = time_uptime; 609 pktq = ip_pktq; 610 } 611 break; 612 #endif 613 #ifdef INET6 614 case PPP_IPV6CP: 615 if (sp->pp_phase == SPPP_PHASE_NETWORK) 616 sppp_cp_input(&ipv6cp, sp, m); 617 m_freem(m); 618 return; 619 620 case PPP_IPV6: 621 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 622 sp->pp_last_activity = time_uptime; 623 pktq = ip6_pktq; 624 } 625 break; 626 #endif 627 #ifdef IPX 628 case PPP_IPX: 629 /* IPX IPXCP not implemented yet */ 630 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 631 isr = NETISR_IPX; 632 inq = &ipxintrq; 633 } 634 break; 635 #endif 636 } 637 638 queue_pkt: 639 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 640 goto drop; 641 } 642 643 /* Check queue. */ 644 if (__predict_true(pktq)) { 645 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 646 goto drop; 647 } 648 return; 649 } 650 651 s = splnet(); 652 if (IF_QFULL(inq)) { 653 /* Queue overflow. */ 654 IF_DROP(inq); 655 splx(s); 656 if (debug) 657 log(LOG_DEBUG, "%s: protocol queue overflow\n", 658 ifp->if_xname); 659 goto drop; 660 } 661 IF_ENQUEUE(inq, m); 662 schednetisr(isr); 663 splx(s); 664 } 665 666 /* 667 * Enqueue transmit packet. 668 */ 669 static int 670 sppp_output(struct ifnet *ifp, struct mbuf *m, 671 const struct sockaddr *dst, struct rtentry *rt) 672 { 673 struct sppp *sp = (struct sppp *) ifp; 674 struct ppp_header *h = NULL; 675 struct ifqueue *ifq = NULL; /* XXX */ 676 int s, error = 0; 677 uint16_t protocol; 678 ALTQ_DECL(struct altq_pktattr pktattr;) 679 680 s = splnet(); 681 682 sp->pp_last_activity = time_uptime; 683 684 if ((ifp->if_flags & IFF_UP) == 0 || 685 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 686 m_freem(m); 687 splx(s); 688 return (ENETDOWN); 689 } 690 691 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 692 /* 693 * Interface is not yet running, but auto-dial. Need 694 * to start LCP for it. 695 */ 696 ifp->if_flags |= IFF_RUNNING; 697 splx(s); 698 lcp.Open(sp); 699 s = splnet(); 700 } 701 702 /* 703 * If the queueing discipline needs packet classification, 704 * do it before prepending link headers. 705 */ 706 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 707 708 #ifdef INET 709 if (dst->sa_family == AF_INET) { 710 struct ip *ip = NULL; 711 struct tcphdr *th = NULL; 712 713 if (m->m_len >= sizeof(struct ip)) { 714 ip = mtod(m, struct ip *); 715 if (ip->ip_p == IPPROTO_TCP && 716 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 717 sizeof(struct tcphdr)) { 718 th = (struct tcphdr *) 719 ((char *)ip + (ip->ip_hl << 2)); 720 } 721 } else 722 ip = NULL; 723 724 /* 725 * When using dynamic local IP address assignment by using 726 * 0.0.0.0 as a local address, the first TCP session will 727 * not connect because the local TCP checksum is computed 728 * using 0.0.0.0 which will later become our real IP address 729 * so the TCP checksum computed at the remote end will 730 * become invalid. So we 731 * - don't let packets with src ip addr 0 thru 732 * - we flag TCP packets with src ip 0 as an error 733 */ 734 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 735 uint8_t proto = ip->ip_p; 736 737 m_freem(m); 738 splx(s); 739 if (proto == IPPROTO_TCP) 740 return (EADDRNOTAVAIL); 741 else 742 return (0); 743 } 744 745 /* 746 * Put low delay, telnet, rlogin and ftp control packets 747 * in front of the queue. 748 */ 749 750 if (!IF_QFULL(&sp->pp_fastq) && 751 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 752 (th && (INTERACTIVE(ntohs(th->th_sport)) || 753 INTERACTIVE(ntohs(th->th_dport)))))) 754 ifq = &sp->pp_fastq; 755 } 756 #endif 757 758 #ifdef INET6 759 if (dst->sa_family == AF_INET6) { 760 /* XXX do something tricky here? */ 761 } 762 #endif 763 764 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 765 /* 766 * Prepend general data packet PPP header. For now, IP only. 767 */ 768 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 769 if (! m) { 770 if (ifp->if_flags & IFF_DEBUG) 771 log(LOG_DEBUG, "%s: no memory for transmit header\n", 772 ifp->if_xname); 773 ++ifp->if_oerrors; 774 splx(s); 775 return (ENOBUFS); 776 } 777 /* 778 * May want to check size of packet 779 * (albeit due to the implementation it's always enough) 780 */ 781 h = mtod(m, struct ppp_header *); 782 if (sp->pp_flags & PP_CISCO) { 783 h->address = CISCO_UNICAST; /* unicast address */ 784 h->control = 0; 785 } else { 786 h->address = PPP_ALLSTATIONS; /* broadcast address */ 787 h->control = PPP_UI; /* Unnumbered Info */ 788 } 789 } 790 791 switch (dst->sa_family) { 792 #ifdef INET 793 case AF_INET: /* Internet Protocol */ 794 if (sp->pp_flags & PP_CISCO) 795 protocol = htons(ETHERTYPE_IP); 796 else { 797 /* 798 * Don't choke with an ENETDOWN early. It's 799 * possible that we just started dialing out, 800 * so don't drop the packet immediately. If 801 * we notice that we run out of buffer space 802 * below, we will however remember that we are 803 * not ready to carry IP packets, and return 804 * ENETDOWN, as opposed to ENOBUFS. 805 */ 806 protocol = htons(PPP_IP); 807 if (sp->state[IDX_IPCP] != STATE_OPENED) 808 error = ENETDOWN; 809 } 810 break; 811 #endif 812 #ifdef INET6 813 case AF_INET6: /* Internet Protocol version 6 */ 814 if (sp->pp_flags & PP_CISCO) 815 protocol = htons(ETHERTYPE_IPV6); 816 else { 817 /* 818 * Don't choke with an ENETDOWN early. It's 819 * possible that we just started dialing out, 820 * so don't drop the packet immediately. If 821 * we notice that we run out of buffer space 822 * below, we will however remember that we are 823 * not ready to carry IP packets, and return 824 * ENETDOWN, as opposed to ENOBUFS. 825 */ 826 protocol = htons(PPP_IPV6); 827 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 828 error = ENETDOWN; 829 } 830 break; 831 #endif 832 #ifdef IPX 833 case AF_IPX: /* Novell IPX Protocol */ 834 protocol = htons((sp->pp_flags & PP_CISCO) ? 835 ETHERTYPE_IPX : PPP_IPX); 836 break; 837 #endif 838 default: 839 m_freem(m); 840 ++ifp->if_oerrors; 841 splx(s); 842 return (EAFNOSUPPORT); 843 } 844 845 if (sp->pp_flags & PP_NOFRAMING) { 846 M_PREPEND(m, 2, M_DONTWAIT); 847 if (m == NULL) { 848 if (ifp->if_flags & IFF_DEBUG) 849 log(LOG_DEBUG, "%s: no memory for transmit header\n", 850 ifp->if_xname); 851 ++ifp->if_oerrors; 852 splx(s); 853 return (ENOBUFS); 854 } 855 *mtod(m, uint16_t *) = protocol; 856 } else { 857 h->protocol = protocol; 858 } 859 860 861 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 862 863 if (error == 0) { 864 /* 865 * Count output packets and bytes. 866 * The packet length includes header + additional hardware 867 * framing according to RFC 1333. 868 */ 869 if (!(ifp->if_flags & IFF_OACTIVE)) 870 (*ifp->if_start)(ifp); 871 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 872 } 873 splx(s); 874 return error; 875 } 876 877 void 878 sppp_attach(struct ifnet *ifp) 879 { 880 struct sppp *sp = (struct sppp *) ifp; 881 882 /* Initialize keepalive handler. */ 883 if (! spppq) { 884 callout_init(&keepalive_ch, 0); 885 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 886 } 887 888 /* Insert new entry into the keepalive list. */ 889 sp->pp_next = spppq; 890 spppq = sp; 891 892 sp->pp_if.if_type = IFT_PPP; 893 sp->pp_if.if_output = sppp_output; 894 sp->pp_fastq.ifq_maxlen = 32; 895 sp->pp_cpq.ifq_maxlen = 20; 896 sp->pp_loopcnt = 0; 897 sp->pp_alivecnt = 0; 898 sp->pp_last_activity = 0; 899 sp->pp_last_receive = 0; 900 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 901 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 902 sp->pp_idle_timeout = 0; 903 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 904 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 905 sp->pp_auth_failures = 0; 906 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 907 sp->pp_phase = SPPP_PHASE_DEAD; 908 sp->pp_up = lcp.Up; 909 sp->pp_down = lcp.Down; 910 911 if_alloc_sadl(ifp); 912 913 memset(&sp->myauth, 0, sizeof sp->myauth); 914 memset(&sp->hisauth, 0, sizeof sp->hisauth); 915 sppp_lcp_init(sp); 916 sppp_ipcp_init(sp); 917 sppp_ipv6cp_init(sp); 918 sppp_pap_init(sp); 919 sppp_chap_init(sp); 920 } 921 922 void 923 sppp_detach(struct ifnet *ifp) 924 { 925 struct sppp **q, *p, *sp = (struct sppp *) ifp; 926 927 /* Remove the entry from the keepalive list. */ 928 for (q = &spppq; (p = *q); q = &p->pp_next) 929 if (p == sp) { 930 *q = p->pp_next; 931 break; 932 } 933 934 /* Stop keepalive handler. */ 935 if (! spppq) { 936 callout_stop(&keepalive_ch); 937 } 938 939 callout_stop(&sp->ch[IDX_LCP]); 940 callout_stop(&sp->ch[IDX_IPCP]); 941 callout_stop(&sp->ch[IDX_PAP]); 942 callout_stop(&sp->ch[IDX_CHAP]); 943 #ifdef INET6 944 callout_stop(&sp->ch[IDX_IPV6CP]); 945 #endif 946 callout_stop(&sp->pap_my_to_ch); 947 948 /* free authentication info */ 949 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 950 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 951 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 952 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 953 954 #if 0 /* done in if_detach() */ 955 if_free_sadl(ifp); 956 #endif 957 } 958 959 /* 960 * Flush the interface output queue. 961 */ 962 void 963 sppp_flush(struct ifnet *ifp) 964 { 965 struct sppp *sp = (struct sppp *) ifp; 966 967 IFQ_PURGE(&sp->pp_if.if_snd); 968 IF_PURGE(&sp->pp_fastq); 969 IF_PURGE(&sp->pp_cpq); 970 } 971 972 /* 973 * Check if the output queue is empty. 974 */ 975 int 976 sppp_isempty(struct ifnet *ifp) 977 { 978 struct sppp *sp = (struct sppp *) ifp; 979 int empty, s; 980 981 s = splnet(); 982 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 983 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 984 splx(s); 985 return (empty); 986 } 987 988 /* 989 * Get next packet to send. 990 */ 991 struct mbuf * 992 sppp_dequeue(struct ifnet *ifp) 993 { 994 struct sppp *sp = (struct sppp *) ifp; 995 struct mbuf *m; 996 int s; 997 998 s = splnet(); 999 /* 1000 * Process only the control protocol queue until we have at 1001 * least one NCP open. 1002 * 1003 * Do always serve all three queues in Cisco mode. 1004 */ 1005 IF_DEQUEUE(&sp->pp_cpq, m); 1006 if (m == NULL && 1007 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1008 IF_DEQUEUE(&sp->pp_fastq, m); 1009 if (m == NULL) 1010 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1011 } 1012 splx(s); 1013 return m; 1014 } 1015 1016 /* 1017 * Process an ioctl request. Called on low priority level. 1018 */ 1019 int 1020 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1021 { 1022 struct lwp *l = curlwp; /* XXX */ 1023 struct ifreq *ifr = (struct ifreq *) data; 1024 struct sppp *sp = (struct sppp *) ifp; 1025 int s, error=0, going_up, going_down, newmode; 1026 1027 s = splnet(); 1028 switch (cmd) { 1029 case SIOCINITIFADDR: 1030 break; 1031 1032 case SIOCSIFFLAGS: 1033 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1034 break; 1035 going_up = ifp->if_flags & IFF_UP && 1036 (ifp->if_flags & IFF_RUNNING) == 0; 1037 going_down = (ifp->if_flags & IFF_UP) == 0 && 1038 ifp->if_flags & IFF_RUNNING; 1039 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1040 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1041 /* sanity */ 1042 newmode = IFF_PASSIVE; 1043 ifp->if_flags &= ~IFF_AUTO; 1044 } 1045 1046 if (going_up || going_down) 1047 lcp.Close(sp); 1048 if (going_up && newmode == 0) { 1049 /* neither auto-dial nor passive */ 1050 ifp->if_flags |= IFF_RUNNING; 1051 if (!(sp->pp_flags & PP_CISCO)) 1052 lcp.Open(sp); 1053 } else if (going_down) { 1054 sppp_flush(ifp); 1055 ifp->if_flags &= ~IFF_RUNNING; 1056 } 1057 1058 break; 1059 1060 case SIOCSIFMTU: 1061 if (ifr->ifr_mtu < PPP_MINMRU || 1062 ifr->ifr_mtu > sp->lcp.their_mru) { 1063 error = EINVAL; 1064 break; 1065 } 1066 /*FALLTHROUGH*/ 1067 case SIOCGIFMTU: 1068 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1069 error = 0; 1070 break; 1071 case SIOCADDMULTI: 1072 case SIOCDELMULTI: 1073 break; 1074 1075 case SPPPSETAUTHCFG: 1076 case SPPPSETLCPCFG: 1077 case SPPPSETIDLETO: 1078 case SPPPSETAUTHFAILURE: 1079 case SPPPSETDNSOPTS: 1080 case SPPPSETKEEPALIVE: 1081 #if defined(COMPAT_50) || defined(MODULAR) 1082 case __SPPPSETIDLETO50: 1083 case __SPPPSETKEEPALIVE50: 1084 #endif /* COMPAT_50 || MODULAR */ 1085 error = kauth_authorize_network(l->l_cred, 1086 KAUTH_NETWORK_INTERFACE, 1087 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1088 NULL); 1089 if (error) 1090 break; 1091 error = sppp_params(sp, cmd, data); 1092 break; 1093 1094 case SPPPGETAUTHCFG: 1095 case SPPPGETLCPCFG: 1096 case SPPPGETAUTHFAILURES: 1097 error = kauth_authorize_network(l->l_cred, 1098 KAUTH_NETWORK_INTERFACE, 1099 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1100 NULL); 1101 if (error) 1102 break; 1103 error = sppp_params(sp, cmd, data); 1104 break; 1105 1106 case SPPPGETSTATUS: 1107 case SPPPGETSTATUSNCP: 1108 case SPPPGETIDLETO: 1109 case SPPPGETDNSOPTS: 1110 case SPPPGETDNSADDRS: 1111 case SPPPGETKEEPALIVE: 1112 #if defined(COMPAT_50) || defined(MODULAR) 1113 case __SPPPGETIDLETO50: 1114 case __SPPPGETKEEPALIVE50: 1115 #endif /* COMPAT_50 || MODULAR */ 1116 error = sppp_params(sp, cmd, data); 1117 break; 1118 1119 default: 1120 error = ifioctl_common(ifp, cmd, data); 1121 break; 1122 } 1123 splx(s); 1124 return (error); 1125 } 1126 1127 1128 /* 1129 * Cisco framing implementation. 1130 */ 1131 1132 /* 1133 * Handle incoming Cisco keepalive protocol packets. 1134 */ 1135 static void 1136 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1137 { 1138 STDDCL; 1139 struct cisco_packet *h; 1140 #ifdef INET 1141 uint32_t me, mymask = 0; /* XXX: GCC */ 1142 #endif 1143 1144 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1145 if (debug) 1146 log(LOG_DEBUG, 1147 "%s: cisco invalid packet length: %d bytes\n", 1148 ifp->if_xname, m->m_pkthdr.len); 1149 return; 1150 } 1151 h = mtod(m, struct cisco_packet *); 1152 if (debug) 1153 log(LOG_DEBUG, 1154 "%s: cisco input: %d bytes " 1155 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1156 ifp->if_xname, m->m_pkthdr.len, 1157 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1158 (u_int)h->time0, (u_int)h->time1); 1159 switch (ntohl(h->type)) { 1160 default: 1161 if (debug) 1162 addlog("%s: cisco unknown packet type: 0x%x\n", 1163 ifp->if_xname, ntohl(h->type)); 1164 break; 1165 case CISCO_ADDR_REPLY: 1166 /* Reply on address request, ignore */ 1167 break; 1168 case CISCO_KEEPALIVE_REQ: 1169 sp->pp_alivecnt = 0; 1170 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1171 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1172 /* Local and remote sequence numbers are equal. 1173 * Probably, the line is in loopback mode. */ 1174 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1175 printf ("%s: loopback\n", 1176 ifp->if_xname); 1177 sp->pp_loopcnt = 0; 1178 if (ifp->if_flags & IFF_UP) { 1179 if_down(ifp); 1180 IF_PURGE(&sp->pp_cpq); 1181 } 1182 } 1183 ++sp->pp_loopcnt; 1184 1185 /* Generate new local sequence number */ 1186 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1187 break; 1188 } 1189 sp->pp_loopcnt = 0; 1190 if (! (ifp->if_flags & IFF_UP) && 1191 (ifp->if_flags & IFF_RUNNING)) { 1192 if_up(ifp); 1193 } 1194 break; 1195 case CISCO_ADDR_REQ: 1196 #ifdef INET 1197 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1198 if (me != 0L) 1199 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1200 #endif 1201 break; 1202 } 1203 } 1204 1205 /* 1206 * Send Cisco keepalive packet. 1207 */ 1208 static void 1209 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1210 { 1211 STDDCL; 1212 struct ppp_header *h; 1213 struct cisco_packet *ch; 1214 struct mbuf *m; 1215 uint32_t t; 1216 1217 t = time_uptime * 1000; 1218 MGETHDR(m, M_DONTWAIT, MT_DATA); 1219 if (! m) 1220 return; 1221 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1222 m->m_pkthdr.rcvif = 0; 1223 1224 h = mtod(m, struct ppp_header *); 1225 h->address = CISCO_MULTICAST; 1226 h->control = 0; 1227 h->protocol = htons(CISCO_KEEPALIVE); 1228 1229 ch = (struct cisco_packet *)(h + 1); 1230 ch->type = htonl(type); 1231 ch->par1 = htonl(par1); 1232 ch->par2 = htonl(par2); 1233 ch->rel = -1; 1234 1235 ch->time0 = htons((u_short)(t >> 16)); 1236 ch->time1 = htons((u_short) t); 1237 1238 if (debug) 1239 log(LOG_DEBUG, 1240 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1241 ifp->if_xname, ntohl(ch->type), ch->par1, 1242 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1243 (u_int)ch->time1); 1244 1245 if (IF_QFULL(&sp->pp_cpq)) { 1246 IF_DROP(&sp->pp_fastq); 1247 IF_DROP(&ifp->if_snd); 1248 m_freem(m); 1249 ++ifp->if_oerrors; 1250 return; 1251 } else 1252 IF_ENQUEUE(&sp->pp_cpq, m); 1253 if (! (ifp->if_flags & IFF_OACTIVE)) 1254 (*ifp->if_start)(ifp); 1255 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1256 } 1257 1258 /* 1259 * PPP protocol implementation. 1260 */ 1261 1262 /* 1263 * Send PPP control protocol packet. 1264 */ 1265 static void 1266 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1267 u_char ident, u_short len, void *data) 1268 { 1269 STDDCL; 1270 struct lcp_header *lh; 1271 struct mbuf *m; 1272 size_t pkthdrlen; 1273 1274 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1275 1276 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1277 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1278 MGETHDR(m, M_DONTWAIT, MT_DATA); 1279 if (! m) 1280 return; 1281 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1282 m->m_pkthdr.rcvif = 0; 1283 1284 if (sp->pp_flags & PP_NOFRAMING) { 1285 *mtod(m, uint16_t *) = htons(proto); 1286 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1287 } else { 1288 struct ppp_header *h; 1289 h = mtod(m, struct ppp_header *); 1290 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1291 h->control = PPP_UI; /* Unnumbered Info */ 1292 h->protocol = htons(proto); /* Link Control Protocol */ 1293 lh = (struct lcp_header *)(h + 1); 1294 } 1295 lh->type = type; 1296 lh->ident = ident; 1297 lh->len = htons(LCP_HEADER_LEN + len); 1298 if (len) 1299 bcopy (data, lh + 1, len); 1300 1301 if (debug) { 1302 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1303 ifp->if_xname, 1304 sppp_proto_name(proto), 1305 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1306 if (len) 1307 sppp_print_bytes((u_char *)(lh + 1), len); 1308 addlog(">\n"); 1309 } 1310 if (IF_QFULL(&sp->pp_cpq)) { 1311 IF_DROP(&sp->pp_fastq); 1312 IF_DROP(&ifp->if_snd); 1313 m_freem(m); 1314 ++ifp->if_oerrors; 1315 return; 1316 } else 1317 IF_ENQUEUE(&sp->pp_cpq, m); 1318 if (! (ifp->if_flags & IFF_OACTIVE)) 1319 (*ifp->if_start)(ifp); 1320 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1321 } 1322 1323 /* 1324 * Handle incoming PPP control protocol packets. 1325 */ 1326 static void 1327 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1328 { 1329 STDDCL; 1330 struct lcp_header *h; 1331 int printlen, len = m->m_pkthdr.len; 1332 int rv; 1333 u_char *p; 1334 uint32_t u32; 1335 1336 if (len < 4) { 1337 if (debug) 1338 log(LOG_DEBUG, 1339 "%s: %s invalid packet length: %d bytes\n", 1340 ifp->if_xname, cp->name, len); 1341 return; 1342 } 1343 h = mtod(m, struct lcp_header *); 1344 if (debug) { 1345 printlen = ntohs(h->len); 1346 log(LOG_DEBUG, 1347 "%s: %s input(%s): <%s id=0x%x len=%d", 1348 ifp->if_xname, cp->name, 1349 sppp_state_name(sp->state[cp->protoidx]), 1350 sppp_cp_type_name(h->type), h->ident, printlen); 1351 if (len < printlen) 1352 printlen = len; 1353 if (printlen > 4) 1354 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1355 addlog(">\n"); 1356 } 1357 if (len > ntohs(h->len)) 1358 len = ntohs(h->len); 1359 p = (u_char *)(h + 1); 1360 switch (h->type) { 1361 case CONF_REQ: 1362 if (len < 4) { 1363 if (debug) 1364 addlog("%s: %s invalid conf-req length %d\n", 1365 ifp->if_xname, cp->name, 1366 len); 1367 ++ifp->if_ierrors; 1368 break; 1369 } 1370 /* handle states where RCR doesn't get a SCA/SCN */ 1371 switch (sp->state[cp->protoidx]) { 1372 case STATE_CLOSING: 1373 case STATE_STOPPING: 1374 return; 1375 case STATE_CLOSED: 1376 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1377 0, 0); 1378 return; 1379 } 1380 rv = (cp->RCR)(sp, h, len); 1381 if (rv < 0) { 1382 /* fatal error, shut down */ 1383 (cp->tld)(sp); 1384 sppp_lcp_tlf(sp); 1385 return; 1386 } 1387 switch (sp->state[cp->protoidx]) { 1388 case STATE_OPENED: 1389 (cp->tld)(sp); 1390 (cp->scr)(sp); 1391 /* fall through... */ 1392 case STATE_ACK_SENT: 1393 case STATE_REQ_SENT: 1394 sppp_cp_change_state(cp, sp, rv? 1395 STATE_ACK_SENT: STATE_REQ_SENT); 1396 break; 1397 case STATE_STOPPED: 1398 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1399 (cp->scr)(sp); 1400 sppp_cp_change_state(cp, sp, rv? 1401 STATE_ACK_SENT: STATE_REQ_SENT); 1402 break; 1403 case STATE_ACK_RCVD: 1404 if (rv) { 1405 sppp_cp_change_state(cp, sp, STATE_OPENED); 1406 if (debug) 1407 log(LOG_DEBUG, "%s: %s tlu\n", 1408 ifp->if_xname, 1409 cp->name); 1410 (cp->tlu)(sp); 1411 } else 1412 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1413 break; 1414 default: 1415 printf("%s: %s illegal %s in state %s\n", 1416 ifp->if_xname, cp->name, 1417 sppp_cp_type_name(h->type), 1418 sppp_state_name(sp->state[cp->protoidx])); 1419 ++ifp->if_ierrors; 1420 } 1421 break; 1422 case CONF_ACK: 1423 if (h->ident != sp->confid[cp->protoidx]) { 1424 if (debug) 1425 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1426 ifp->if_xname, cp->name, 1427 h->ident, sp->confid[cp->protoidx]); 1428 ++ifp->if_ierrors; 1429 break; 1430 } 1431 switch (sp->state[cp->protoidx]) { 1432 case STATE_CLOSED: 1433 case STATE_STOPPED: 1434 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1435 break; 1436 case STATE_CLOSING: 1437 case STATE_STOPPING: 1438 break; 1439 case STATE_REQ_SENT: 1440 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1441 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1442 break; 1443 case STATE_OPENED: 1444 (cp->tld)(sp); 1445 /* fall through */ 1446 case STATE_ACK_RCVD: 1447 (cp->scr)(sp); 1448 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1449 break; 1450 case STATE_ACK_SENT: 1451 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1452 sppp_cp_change_state(cp, sp, STATE_OPENED); 1453 if (debug) 1454 log(LOG_DEBUG, "%s: %s tlu\n", 1455 ifp->if_xname, cp->name); 1456 (cp->tlu)(sp); 1457 break; 1458 default: 1459 printf("%s: %s illegal %s in state %s\n", 1460 ifp->if_xname, cp->name, 1461 sppp_cp_type_name(h->type), 1462 sppp_state_name(sp->state[cp->protoidx])); 1463 ++ifp->if_ierrors; 1464 } 1465 break; 1466 case CONF_NAK: 1467 case CONF_REJ: 1468 if (h->ident != sp->confid[cp->protoidx]) { 1469 if (debug) 1470 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1471 ifp->if_xname, cp->name, 1472 h->ident, sp->confid[cp->protoidx]); 1473 ++ifp->if_ierrors; 1474 break; 1475 } 1476 if (h->type == CONF_NAK) 1477 (cp->RCN_nak)(sp, h, len); 1478 else /* CONF_REJ */ 1479 (cp->RCN_rej)(sp, h, len); 1480 1481 switch (sp->state[cp->protoidx]) { 1482 case STATE_CLOSED: 1483 case STATE_STOPPED: 1484 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1485 break; 1486 case STATE_REQ_SENT: 1487 case STATE_ACK_SENT: 1488 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1489 (cp->scr)(sp); 1490 break; 1491 case STATE_OPENED: 1492 (cp->tld)(sp); 1493 /* fall through */ 1494 case STATE_ACK_RCVD: 1495 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1496 (cp->scr)(sp); 1497 break; 1498 case STATE_CLOSING: 1499 case STATE_STOPPING: 1500 break; 1501 default: 1502 printf("%s: %s illegal %s in state %s\n", 1503 ifp->if_xname, cp->name, 1504 sppp_cp_type_name(h->type), 1505 sppp_state_name(sp->state[cp->protoidx])); 1506 ++ifp->if_ierrors; 1507 } 1508 break; 1509 1510 case TERM_REQ: 1511 switch (sp->state[cp->protoidx]) { 1512 case STATE_ACK_RCVD: 1513 case STATE_ACK_SENT: 1514 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1515 /* fall through */ 1516 case STATE_CLOSED: 1517 case STATE_STOPPED: 1518 case STATE_CLOSING: 1519 case STATE_STOPPING: 1520 case STATE_REQ_SENT: 1521 sta: 1522 /* Send Terminate-Ack packet. */ 1523 if (debug) 1524 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1525 ifp->if_xname, cp->name); 1526 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1527 break; 1528 case STATE_OPENED: 1529 (cp->tld)(sp); 1530 sp->rst_counter[cp->protoidx] = 0; 1531 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1532 goto sta; 1533 default: 1534 printf("%s: %s illegal %s in state %s\n", 1535 ifp->if_xname, cp->name, 1536 sppp_cp_type_name(h->type), 1537 sppp_state_name(sp->state[cp->protoidx])); 1538 ++ifp->if_ierrors; 1539 } 1540 break; 1541 case TERM_ACK: 1542 switch (sp->state[cp->protoidx]) { 1543 case STATE_CLOSED: 1544 case STATE_STOPPED: 1545 case STATE_REQ_SENT: 1546 case STATE_ACK_SENT: 1547 break; 1548 case STATE_CLOSING: 1549 (cp->tlf)(sp); 1550 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1551 sppp_lcp_check_and_close(sp); 1552 break; 1553 case STATE_STOPPING: 1554 (cp->tlf)(sp); 1555 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1556 sppp_lcp_check_and_close(sp); 1557 break; 1558 case STATE_ACK_RCVD: 1559 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1560 break; 1561 case STATE_OPENED: 1562 (cp->tld)(sp); 1563 (cp->scr)(sp); 1564 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1565 break; 1566 default: 1567 printf("%s: %s illegal %s in state %s\n", 1568 ifp->if_xname, cp->name, 1569 sppp_cp_type_name(h->type), 1570 sppp_state_name(sp->state[cp->protoidx])); 1571 ++ifp->if_ierrors; 1572 } 1573 break; 1574 case CODE_REJ: 1575 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1576 log(LOG_INFO, 1577 "%s: %s: ignoring RXJ (%s) for code ?, " 1578 "danger will robinson\n", 1579 ifp->if_xname, cp->name, 1580 sppp_cp_type_name(h->type)); 1581 switch (sp->state[cp->protoidx]) { 1582 case STATE_CLOSED: 1583 case STATE_STOPPED: 1584 case STATE_REQ_SENT: 1585 case STATE_ACK_SENT: 1586 case STATE_CLOSING: 1587 case STATE_STOPPING: 1588 case STATE_OPENED: 1589 break; 1590 case STATE_ACK_RCVD: 1591 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1592 break; 1593 default: 1594 printf("%s: %s illegal %s in state %s\n", 1595 ifp->if_xname, cp->name, 1596 sppp_cp_type_name(h->type), 1597 sppp_state_name(sp->state[cp->protoidx])); 1598 ++ifp->if_ierrors; 1599 } 1600 break; 1601 case PROTO_REJ: 1602 { 1603 int catastrophic; 1604 const struct cp *upper; 1605 int i; 1606 uint16_t proto; 1607 1608 catastrophic = 0; 1609 upper = NULL; 1610 proto = p[0] << 8 | p[1]; 1611 for (i = 0; i < IDX_COUNT; i++) { 1612 if (cps[i]->proto == proto) { 1613 upper = cps[i]; 1614 break; 1615 } 1616 } 1617 if (upper == NULL) 1618 catastrophic++; 1619 1620 if (debug) 1621 log(LOG_INFO, 1622 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1623 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1624 sppp_cp_type_name(h->type), proto, 1625 upper ? upper->name : "unknown", 1626 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1627 1628 /* 1629 * if we got RXJ+ against conf-req, the peer does not implement 1630 * this particular protocol type. terminate the protocol. 1631 */ 1632 if (upper && !catastrophic) { 1633 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1634 upper->Close(sp); 1635 break; 1636 } 1637 } 1638 1639 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1640 switch (sp->state[cp->protoidx]) { 1641 case STATE_CLOSED: 1642 case STATE_STOPPED: 1643 case STATE_REQ_SENT: 1644 case STATE_ACK_SENT: 1645 case STATE_CLOSING: 1646 case STATE_STOPPING: 1647 case STATE_OPENED: 1648 break; 1649 case STATE_ACK_RCVD: 1650 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1651 break; 1652 default: 1653 printf("%s: %s illegal %s in state %s\n", 1654 ifp->if_xname, cp->name, 1655 sppp_cp_type_name(h->type), 1656 sppp_state_name(sp->state[cp->protoidx])); 1657 ++ifp->if_ierrors; 1658 } 1659 break; 1660 } 1661 case DISC_REQ: 1662 if (cp->proto != PPP_LCP) 1663 goto illegal; 1664 /* Discard the packet. */ 1665 break; 1666 case ECHO_REQ: 1667 if (cp->proto != PPP_LCP) 1668 goto illegal; 1669 if (sp->state[cp->protoidx] != STATE_OPENED) { 1670 if (debug) 1671 addlog("%s: lcp echo req but lcp closed\n", 1672 ifp->if_xname); 1673 ++ifp->if_ierrors; 1674 break; 1675 } 1676 if (len < 8) { 1677 if (debug) 1678 addlog("%s: invalid lcp echo request " 1679 "packet length: %d bytes\n", 1680 ifp->if_xname, len); 1681 break; 1682 } 1683 memcpy(&u32, h + 1, sizeof u32); 1684 if (ntohl(u32) == sp->lcp.magic) { 1685 /* Line loopback mode detected. */ 1686 printf("%s: loopback\n", ifp->if_xname); 1687 if_down(ifp); 1688 IF_PURGE(&sp->pp_cpq); 1689 1690 /* Shut down the PPP link. */ 1691 /* XXX */ 1692 lcp.Down(sp); 1693 lcp.Up(sp); 1694 break; 1695 } 1696 u32 = htonl(sp->lcp.magic); 1697 memcpy(h + 1, &u32, sizeof u32); 1698 if (debug) 1699 addlog("%s: got lcp echo req, sending echo rep\n", 1700 ifp->if_xname); 1701 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1702 h + 1); 1703 break; 1704 case ECHO_REPLY: 1705 if (cp->proto != PPP_LCP) 1706 goto illegal; 1707 if (h->ident != sp->lcp.echoid) { 1708 ++ifp->if_ierrors; 1709 break; 1710 } 1711 if (len < 8) { 1712 if (debug) 1713 addlog("%s: lcp invalid echo reply " 1714 "packet length: %d bytes\n", 1715 ifp->if_xname, len); 1716 break; 1717 } 1718 if (debug) 1719 addlog("%s: lcp got echo rep\n", 1720 ifp->if_xname); 1721 memcpy(&u32, h + 1, sizeof u32); 1722 if (ntohl(u32) != sp->lcp.magic) 1723 sp->pp_alivecnt = 0; 1724 break; 1725 default: 1726 /* Unknown packet type -- send Code-Reject packet. */ 1727 illegal: 1728 if (debug) 1729 addlog("%s: %s send code-rej for 0x%x\n", 1730 ifp->if_xname, cp->name, h->type); 1731 sppp_cp_send(sp, cp->proto, CODE_REJ, 1732 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1733 ++ifp->if_ierrors; 1734 } 1735 } 1736 1737 1738 /* 1739 * The generic part of all Up/Down/Open/Close/TO event handlers. 1740 * Basically, the state transition handling in the automaton. 1741 */ 1742 static void 1743 sppp_up_event(const struct cp *cp, struct sppp *sp) 1744 { 1745 STDDCL; 1746 1747 if (debug) 1748 log(LOG_DEBUG, "%s: %s up(%s)\n", 1749 ifp->if_xname, cp->name, 1750 sppp_state_name(sp->state[cp->protoidx])); 1751 1752 switch (sp->state[cp->protoidx]) { 1753 case STATE_INITIAL: 1754 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1755 break; 1756 case STATE_STARTING: 1757 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1758 (cp->scr)(sp); 1759 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1760 break; 1761 default: 1762 printf("%s: %s illegal up in state %s\n", 1763 ifp->if_xname, cp->name, 1764 sppp_state_name(sp->state[cp->protoidx])); 1765 } 1766 } 1767 1768 static void 1769 sppp_down_event(const struct cp *cp, struct sppp *sp) 1770 { 1771 STDDCL; 1772 1773 if (debug) 1774 log(LOG_DEBUG, "%s: %s down(%s)\n", 1775 ifp->if_xname, cp->name, 1776 sppp_state_name(sp->state[cp->protoidx])); 1777 1778 switch (sp->state[cp->protoidx]) { 1779 case STATE_CLOSED: 1780 case STATE_CLOSING: 1781 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1782 break; 1783 case STATE_STOPPED: 1784 (cp->tls)(sp); 1785 /* fall through */ 1786 case STATE_STOPPING: 1787 case STATE_REQ_SENT: 1788 case STATE_ACK_RCVD: 1789 case STATE_ACK_SENT: 1790 sppp_cp_change_state(cp, sp, STATE_STARTING); 1791 break; 1792 case STATE_OPENED: 1793 (cp->tld)(sp); 1794 sppp_cp_change_state(cp, sp, STATE_STARTING); 1795 break; 1796 default: 1797 printf("%s: %s illegal down in state %s\n", 1798 ifp->if_xname, cp->name, 1799 sppp_state_name(sp->state[cp->protoidx])); 1800 } 1801 } 1802 1803 1804 static void 1805 sppp_open_event(const struct cp *cp, struct sppp *sp) 1806 { 1807 STDDCL; 1808 1809 if (debug) 1810 log(LOG_DEBUG, "%s: %s open(%s)\n", 1811 ifp->if_xname, cp->name, 1812 sppp_state_name(sp->state[cp->protoidx])); 1813 1814 switch (sp->state[cp->protoidx]) { 1815 case STATE_INITIAL: 1816 sppp_cp_change_state(cp, sp, STATE_STARTING); 1817 (cp->tls)(sp); 1818 break; 1819 case STATE_STARTING: 1820 break; 1821 case STATE_CLOSED: 1822 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1823 (cp->scr)(sp); 1824 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1825 break; 1826 case STATE_STOPPED: 1827 case STATE_STOPPING: 1828 case STATE_REQ_SENT: 1829 case STATE_ACK_RCVD: 1830 case STATE_ACK_SENT: 1831 case STATE_OPENED: 1832 break; 1833 case STATE_CLOSING: 1834 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1835 break; 1836 } 1837 } 1838 1839 1840 static void 1841 sppp_close_event(const struct cp *cp, struct sppp *sp) 1842 { 1843 STDDCL; 1844 1845 if (debug) 1846 log(LOG_DEBUG, "%s: %s close(%s)\n", 1847 ifp->if_xname, cp->name, 1848 sppp_state_name(sp->state[cp->protoidx])); 1849 1850 switch (sp->state[cp->protoidx]) { 1851 case STATE_INITIAL: 1852 case STATE_CLOSED: 1853 case STATE_CLOSING: 1854 break; 1855 case STATE_STARTING: 1856 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1857 (cp->tlf)(sp); 1858 break; 1859 case STATE_STOPPED: 1860 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1861 break; 1862 case STATE_STOPPING: 1863 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1864 break; 1865 case STATE_OPENED: 1866 (cp->tld)(sp); 1867 /* fall through */ 1868 case STATE_REQ_SENT: 1869 case STATE_ACK_RCVD: 1870 case STATE_ACK_SENT: 1871 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1872 sppp_cp_send(sp, cp->proto, TERM_REQ, 1873 ++sp->pp_seq[cp->protoidx], 0, 0); 1874 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1875 break; 1876 } 1877 } 1878 1879 static void 1880 sppp_to_event(const struct cp *cp, struct sppp *sp) 1881 { 1882 STDDCL; 1883 int s; 1884 1885 s = splnet(); 1886 if (debug) 1887 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1888 ifp->if_xname, cp->name, 1889 sppp_state_name(sp->state[cp->protoidx]), 1890 sp->rst_counter[cp->protoidx]); 1891 1892 if (--sp->rst_counter[cp->protoidx] < 0) 1893 /* TO- event */ 1894 switch (sp->state[cp->protoidx]) { 1895 case STATE_CLOSING: 1896 (cp->tlf)(sp); 1897 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1898 sppp_lcp_check_and_close(sp); 1899 break; 1900 case STATE_STOPPING: 1901 (cp->tlf)(sp); 1902 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1903 sppp_lcp_check_and_close(sp); 1904 break; 1905 case STATE_REQ_SENT: 1906 case STATE_ACK_RCVD: 1907 case STATE_ACK_SENT: 1908 (cp->tlf)(sp); 1909 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1910 sppp_lcp_check_and_close(sp); 1911 break; 1912 } 1913 else 1914 /* TO+ event */ 1915 switch (sp->state[cp->protoidx]) { 1916 case STATE_CLOSING: 1917 case STATE_STOPPING: 1918 sppp_cp_send(sp, cp->proto, TERM_REQ, 1919 ++sp->pp_seq[cp->protoidx], 0, 0); 1920 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1921 cp->TO, sp); 1922 break; 1923 case STATE_REQ_SENT: 1924 case STATE_ACK_RCVD: 1925 (cp->scr)(sp); 1926 /* sppp_cp_change_state() will restart the timer */ 1927 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1928 break; 1929 case STATE_ACK_SENT: 1930 (cp->scr)(sp); 1931 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1932 cp->TO, sp); 1933 break; 1934 } 1935 1936 splx(s); 1937 } 1938 1939 /* 1940 * Change the state of a control protocol in the state automaton. 1941 * Takes care of starting/stopping the restart timer. 1942 */ 1943 void 1944 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1945 { 1946 sp->state[cp->protoidx] = newstate; 1947 callout_stop(&sp->ch[cp->protoidx]); 1948 switch (newstate) { 1949 case STATE_INITIAL: 1950 case STATE_STARTING: 1951 case STATE_CLOSED: 1952 case STATE_STOPPED: 1953 case STATE_OPENED: 1954 break; 1955 case STATE_CLOSING: 1956 case STATE_STOPPING: 1957 case STATE_REQ_SENT: 1958 case STATE_ACK_RCVD: 1959 case STATE_ACK_SENT: 1960 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1961 cp->TO, sp); 1962 break; 1963 } 1964 } 1965 1966 /* 1967 *--------------------------------------------------------------------------* 1968 * * 1969 * The LCP implementation. * 1970 * * 1971 *--------------------------------------------------------------------------* 1972 */ 1973 static void 1974 sppp_lcp_init(struct sppp *sp) 1975 { 1976 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1977 sp->lcp.magic = 0; 1978 sp->state[IDX_LCP] = STATE_INITIAL; 1979 sp->fail_counter[IDX_LCP] = 0; 1980 sp->pp_seq[IDX_LCP] = 0; 1981 sp->pp_rseq[IDX_LCP] = 0; 1982 sp->lcp.protos = 0; 1983 1984 /* 1985 * Initialize counters and timeout values. Note that we don't 1986 * use the 3 seconds suggested in RFC 1661 since we are likely 1987 * running on a fast link. XXX We should probably implement 1988 * the exponential backoff option. Note that these values are 1989 * relevant for all control protocols, not just LCP only. 1990 */ 1991 sp->lcp.timeout = 1 * hz; 1992 sp->lcp.max_terminate = 2; 1993 sp->lcp.max_configure = 10; 1994 sp->lcp.max_failure = 10; 1995 callout_init(&sp->ch[IDX_LCP], 0); 1996 } 1997 1998 static void 1999 sppp_lcp_up(struct sppp *sp) 2000 { 2001 STDDCL; 2002 2003 /* Initialize activity timestamp: opening a connection is an activity */ 2004 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2005 2006 /* 2007 * If this interface is passive or dial-on-demand, and we are 2008 * still in Initial state, it means we've got an incoming 2009 * call. Activate the interface. 2010 */ 2011 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2012 if (debug) 2013 log(LOG_DEBUG, 2014 "%s: Up event", ifp->if_xname); 2015 ifp->if_flags |= IFF_RUNNING; 2016 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2017 if (debug) 2018 addlog("(incoming call)\n"); 2019 sp->pp_flags |= PP_CALLIN; 2020 lcp.Open(sp); 2021 } else if (debug) 2022 addlog("\n"); 2023 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2024 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2025 ifp->if_flags |= IFF_RUNNING; 2026 lcp.Open(sp); 2027 } 2028 2029 sppp_up_event(&lcp, sp); 2030 } 2031 2032 static void 2033 sppp_lcp_down(struct sppp *sp) 2034 { 2035 STDDCL; 2036 2037 sppp_down_event(&lcp, sp); 2038 2039 /* 2040 * If this is neither a dial-on-demand nor a passive 2041 * interface, simulate an ``ifconfig down'' action, so the 2042 * administrator can force a redial by another ``ifconfig 2043 * up''. XXX For leased line operation, should we immediately 2044 * try to reopen the connection here? 2045 */ 2046 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2047 if (debug) 2048 log(LOG_INFO, 2049 "%s: Down event (carrier loss), taking interface down.\n", 2050 ifp->if_xname); 2051 if_down(ifp); 2052 } else { 2053 if (debug) 2054 log(LOG_DEBUG, 2055 "%s: Down event (carrier loss)\n", 2056 ifp->if_xname); 2057 } 2058 sp->pp_flags &= ~PP_CALLIN; 2059 if (sp->state[IDX_LCP] != STATE_INITIAL) 2060 lcp.Close(sp); 2061 ifp->if_flags &= ~IFF_RUNNING; 2062 } 2063 2064 static void 2065 sppp_lcp_open(struct sppp *sp) 2066 { 2067 if (sp->pp_if.if_mtu < PP_MTU) { 2068 sp->lcp.mru = sp->pp_if.if_mtu; 2069 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2070 } else 2071 sp->lcp.mru = PP_MTU; 2072 sp->lcp.their_mru = PP_MTU; 2073 2074 /* 2075 * If we are authenticator, negotiate LCP_AUTH 2076 */ 2077 if (sp->hisauth.proto != 0) 2078 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2079 else 2080 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2081 sp->pp_flags &= ~PP_NEEDAUTH; 2082 sppp_open_event(&lcp, sp); 2083 } 2084 2085 static void 2086 sppp_lcp_close(struct sppp *sp) 2087 { 2088 sppp_close_event(&lcp, sp); 2089 } 2090 2091 static void 2092 sppp_lcp_TO(void *cookie) 2093 { 2094 sppp_to_event(&lcp, (struct sppp *)cookie); 2095 } 2096 2097 /* 2098 * Analyze a configure request. Return true if it was agreeable, and 2099 * caused action sca, false if it has been rejected or nak'ed, and 2100 * caused action scn. (The return value is used to make the state 2101 * transition decision in the state automaton.) 2102 */ 2103 static int 2104 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2105 { 2106 STDDCL; 2107 u_char *buf, *r, *p; 2108 int origlen, rlen; 2109 uint32_t nmagic; 2110 u_short authproto; 2111 2112 len -= 4; 2113 origlen = len; 2114 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2115 if (! buf) 2116 return (0); 2117 2118 if (debug) 2119 log(LOG_DEBUG, "%s: lcp parse opts:", 2120 ifp->if_xname); 2121 2122 /* pass 1: check for things that need to be rejected */ 2123 p = (void *)(h + 1); 2124 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2125 /* Sanity check option length */ 2126 if (p[1] > len) { 2127 /* 2128 * Malicious option - drop immediately. 2129 * XXX Maybe we should just RXJ it? 2130 */ 2131 addlog("%s: received malicious LCP option 0x%02x, " 2132 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2133 p[0], p[1], len); 2134 goto drop; 2135 } 2136 if (debug) 2137 addlog(" %s", sppp_lcp_opt_name(*p)); 2138 switch (*p) { 2139 case LCP_OPT_MAGIC: 2140 /* Magic number. */ 2141 /* fall through, both are same length */ 2142 case LCP_OPT_ASYNC_MAP: 2143 /* Async control character map. */ 2144 if (len >= 6 || p[1] == 6) 2145 continue; 2146 if (debug) 2147 addlog(" [invalid]"); 2148 break; 2149 case LCP_OPT_MRU: 2150 /* Maximum receive unit. */ 2151 if (len >= 4 && p[1] == 4) 2152 continue; 2153 if (debug) 2154 addlog(" [invalid]"); 2155 break; 2156 case LCP_OPT_AUTH_PROTO: 2157 if (len < 4) { 2158 if (debug) 2159 addlog(" [invalid]"); 2160 break; 2161 } 2162 authproto = (p[2] << 8) + p[3]; 2163 if (authproto == PPP_CHAP && p[1] != 5) { 2164 if (debug) 2165 addlog(" [invalid chap len]"); 2166 break; 2167 } 2168 if (sp->myauth.proto == 0) { 2169 /* we are not configured to do auth */ 2170 if (debug) 2171 addlog(" [not configured]"); 2172 break; 2173 } 2174 /* 2175 * Remote want us to authenticate, remember this, 2176 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2177 * up. 2178 */ 2179 sp->pp_flags |= PP_NEEDAUTH; 2180 continue; 2181 default: 2182 /* Others not supported. */ 2183 if (debug) 2184 addlog(" [rej]"); 2185 break; 2186 } 2187 /* Add the option to rejected list. */ 2188 bcopy (p, r, p[1]); 2189 r += p[1]; 2190 rlen += p[1]; 2191 } 2192 if (rlen) { 2193 if (debug) 2194 addlog(" send conf-rej\n"); 2195 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2196 goto end; 2197 } else if (debug) 2198 addlog("\n"); 2199 2200 /* 2201 * pass 2: check for option values that are unacceptable and 2202 * thus require to be nak'ed. 2203 */ 2204 if (debug) 2205 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2206 ifp->if_xname); 2207 2208 p = (void *)(h + 1); 2209 len = origlen; 2210 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2211 if (debug) 2212 addlog(" %s", sppp_lcp_opt_name(*p)); 2213 switch (*p) { 2214 case LCP_OPT_MAGIC: 2215 /* Magic number -- extract. */ 2216 nmagic = (uint32_t)p[2] << 24 | 2217 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2218 if (nmagic != sp->lcp.magic) { 2219 if (debug) 2220 addlog(" 0x%x", nmagic); 2221 continue; 2222 } 2223 /* 2224 * Local and remote magics equal -- loopback? 2225 */ 2226 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2227 printf ("%s: loopback\n", 2228 ifp->if_xname); 2229 sp->pp_loopcnt = 0; 2230 if (ifp->if_flags & IFF_UP) { 2231 if_down(ifp); 2232 IF_PURGE(&sp->pp_cpq); 2233 /* XXX ? */ 2234 lcp.Down(sp); 2235 lcp.Up(sp); 2236 } 2237 } else if (debug) 2238 addlog(" [glitch]"); 2239 ++sp->pp_loopcnt; 2240 /* 2241 * We negate our magic here, and NAK it. If 2242 * we see it later in an NAK packet, we 2243 * suggest a new one. 2244 */ 2245 nmagic = ~sp->lcp.magic; 2246 /* Gonna NAK it. */ 2247 p[2] = nmagic >> 24; 2248 p[3] = nmagic >> 16; 2249 p[4] = nmagic >> 8; 2250 p[5] = nmagic; 2251 break; 2252 2253 case LCP_OPT_ASYNC_MAP: 2254 /* 2255 * Async control character map -- just ignore it. 2256 * 2257 * Quote from RFC 1662, chapter 6: 2258 * To enable this functionality, synchronous PPP 2259 * implementations MUST always respond to the 2260 * Async-Control-Character-Map Configuration 2261 * Option with the LCP Configure-Ack. However, 2262 * acceptance of the Configuration Option does 2263 * not imply that the synchronous implementation 2264 * will do any ACCM mapping. Instead, all such 2265 * octet mapping will be performed by the 2266 * asynchronous-to-synchronous converter. 2267 */ 2268 continue; 2269 2270 case LCP_OPT_MRU: 2271 /* 2272 * Maximum receive unit. Always agreeable, 2273 * but ignored by now. 2274 */ 2275 sp->lcp.their_mru = p[2] * 256 + p[3]; 2276 if (debug) 2277 addlog(" %ld", sp->lcp.their_mru); 2278 continue; 2279 2280 case LCP_OPT_AUTH_PROTO: 2281 authproto = (p[2] << 8) + p[3]; 2282 if (sp->myauth.proto != authproto) { 2283 /* not agreed, nak */ 2284 if (debug) 2285 addlog(" [mine %s != his %s]", 2286 sppp_proto_name(sp->myauth.proto), 2287 sppp_proto_name(authproto)); 2288 p[2] = sp->myauth.proto >> 8; 2289 p[3] = sp->myauth.proto; 2290 break; 2291 } 2292 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2293 if (debug) 2294 addlog(" [chap not MD5]"); 2295 p[4] = CHAP_MD5; 2296 break; 2297 } 2298 continue; 2299 } 2300 /* Add the option to nak'ed list. */ 2301 bcopy (p, r, p[1]); 2302 r += p[1]; 2303 rlen += p[1]; 2304 } 2305 if (rlen) { 2306 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2307 if (debug) 2308 addlog(" max_failure (%d) exceeded, " 2309 "send conf-rej\n", 2310 sp->lcp.max_failure); 2311 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2312 } else { 2313 if (debug) 2314 addlog(" send conf-nak\n"); 2315 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2316 } 2317 goto end; 2318 } else { 2319 if (debug) 2320 addlog(" send conf-ack\n"); 2321 sp->fail_counter[IDX_LCP] = 0; 2322 sp->pp_loopcnt = 0; 2323 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2324 } 2325 2326 end: 2327 free(buf, M_TEMP); 2328 return (rlen == 0); 2329 2330 drop: 2331 free(buf, M_TEMP); 2332 return -1; 2333 } 2334 2335 /* 2336 * Analyze the LCP Configure-Reject option list, and adjust our 2337 * negotiation. 2338 */ 2339 static void 2340 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2341 { 2342 STDDCL; 2343 u_char *buf, *p; 2344 2345 len -= 4; 2346 buf = malloc (len, M_TEMP, M_NOWAIT); 2347 if (!buf) 2348 return; 2349 2350 if (debug) 2351 log(LOG_DEBUG, "%s: lcp rej opts:", 2352 ifp->if_xname); 2353 2354 p = (void *)(h + 1); 2355 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2356 /* Sanity check option length */ 2357 if (p[1] > len) { 2358 /* 2359 * Malicious option - drop immediately. 2360 * XXX Maybe we should just RXJ it? 2361 */ 2362 addlog("%s: received malicious LCP option, " 2363 "dropping.\n", ifp->if_xname); 2364 goto drop; 2365 } 2366 if (debug) 2367 addlog(" %s", sppp_lcp_opt_name(*p)); 2368 switch (*p) { 2369 case LCP_OPT_MAGIC: 2370 /* Magic number -- can't use it, use 0 */ 2371 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2372 sp->lcp.magic = 0; 2373 break; 2374 case LCP_OPT_MRU: 2375 /* 2376 * We try to negotiate a lower MRU if the underlying 2377 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2378 * peer rejects this lower rate, fallback to the 2379 * default. 2380 */ 2381 if (debug) { 2382 addlog("%s: warning: peer rejected our MRU of " 2383 "%ld bytes. Defaulting to %d bytes\n", 2384 ifp->if_xname, sp->lcp.mru, PP_MTU); 2385 } 2386 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2387 sp->lcp.mru = PP_MTU; 2388 break; 2389 case LCP_OPT_AUTH_PROTO: 2390 /* 2391 * Peer doesn't want to authenticate himself, 2392 * deny unless this is a dialout call, and 2393 * SPPP_AUTHFLAG_NOCALLOUT is set. 2394 */ 2395 if ((sp->pp_flags & PP_CALLIN) == 0 && 2396 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2397 if (debug) 2398 addlog(" [don't insist on auth " 2399 "for callout]"); 2400 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2401 break; 2402 } 2403 if (debug) 2404 addlog("[access denied]\n"); 2405 lcp.Close(sp); 2406 break; 2407 } 2408 } 2409 if (debug) 2410 addlog("\n"); 2411 drop: 2412 free(buf, M_TEMP); 2413 return; 2414 } 2415 2416 /* 2417 * Analyze the LCP Configure-NAK option list, and adjust our 2418 * negotiation. 2419 */ 2420 static void 2421 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2422 { 2423 STDDCL; 2424 u_char *buf, *p; 2425 uint32_t magic; 2426 2427 len -= 4; 2428 buf = malloc (len, M_TEMP, M_NOWAIT); 2429 if (!buf) 2430 return; 2431 2432 if (debug) 2433 log(LOG_DEBUG, "%s: lcp nak opts:", 2434 ifp->if_xname); 2435 2436 p = (void *)(h + 1); 2437 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2438 /* Sanity check option length */ 2439 if (p[1] > len) { 2440 /* 2441 * Malicious option - drop immediately. 2442 * XXX Maybe we should just RXJ it? 2443 */ 2444 addlog("%s: received malicious LCP option, " 2445 "dropping.\n", ifp->if_xname); 2446 goto drop; 2447 } 2448 if (debug) 2449 addlog(" %s", sppp_lcp_opt_name(*p)); 2450 switch (*p) { 2451 case LCP_OPT_MAGIC: 2452 /* Magic number -- renegotiate */ 2453 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2454 len >= 6 && p[1] == 6) { 2455 magic = (uint32_t)p[2] << 24 | 2456 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2457 /* 2458 * If the remote magic is our negated one, 2459 * this looks like a loopback problem. 2460 * Suggest a new magic to make sure. 2461 */ 2462 if (magic == ~sp->lcp.magic) { 2463 if (debug) 2464 addlog(" magic glitch"); 2465 sp->lcp.magic = cprng_fast32(); 2466 } else { 2467 sp->lcp.magic = magic; 2468 if (debug) 2469 addlog(" %d", magic); 2470 } 2471 } 2472 break; 2473 case LCP_OPT_MRU: 2474 /* 2475 * Peer wants to advise us to negotiate an MRU. 2476 * Agree on it if it's reasonable, or use 2477 * default otherwise. 2478 */ 2479 if (len >= 4 && p[1] == 4) { 2480 u_int mru = p[2] * 256 + p[3]; 2481 if (debug) 2482 addlog(" %d", mru); 2483 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2484 mru = sp->pp_if.if_mtu; 2485 sp->lcp.mru = mru; 2486 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2487 } 2488 break; 2489 case LCP_OPT_AUTH_PROTO: 2490 /* 2491 * Peer doesn't like our authentication method, 2492 * deny. 2493 */ 2494 if (debug) 2495 addlog("[access denied]\n"); 2496 lcp.Close(sp); 2497 break; 2498 } 2499 } 2500 if (debug) 2501 addlog("\n"); 2502 drop: 2503 free(buf, M_TEMP); 2504 return; 2505 } 2506 2507 static void 2508 sppp_lcp_tlu(struct sppp *sp) 2509 { 2510 STDDCL; 2511 int i; 2512 uint32_t mask; 2513 2514 /* XXX ? */ 2515 if (! (ifp->if_flags & IFF_UP) && 2516 (ifp->if_flags & IFF_RUNNING)) { 2517 /* Coming out of loopback mode. */ 2518 if_up(ifp); 2519 } 2520 2521 for (i = 0; i < IDX_COUNT; i++) 2522 if ((cps[i])->flags & CP_QUAL) 2523 (cps[i])->Open(sp); 2524 2525 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2526 (sp->pp_flags & PP_NEEDAUTH) != 0) 2527 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2528 else 2529 sp->pp_phase = SPPP_PHASE_NETWORK; 2530 2531 if (debug) 2532 { 2533 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2534 sppp_phase_name(sp->pp_phase)); 2535 } 2536 2537 /* 2538 * Open all authentication protocols. This is even required 2539 * if we already proceeded to network phase, since it might be 2540 * that remote wants us to authenticate, so we might have to 2541 * send a PAP request. Undesired authentication protocols 2542 * don't do anything when they get an Open event. 2543 */ 2544 for (i = 0; i < IDX_COUNT; i++) 2545 if ((cps[i])->flags & CP_AUTH) 2546 (cps[i])->Open(sp); 2547 2548 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2549 /* Notify all NCPs. */ 2550 for (i = 0; i < IDX_COUNT; i++) 2551 if ((cps[i])->flags & CP_NCP) 2552 (cps[i])->Open(sp); 2553 } 2554 2555 /* Send Up events to all started protos. */ 2556 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2557 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2558 (cps[i])->Up(sp); 2559 2560 /* notify low-level driver of state change */ 2561 if (sp->pp_chg) 2562 sp->pp_chg(sp, (int)sp->pp_phase); 2563 2564 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2565 /* if no NCP is starting, close down */ 2566 sppp_lcp_check_and_close(sp); 2567 } 2568 2569 static void 2570 sppp_lcp_tld(struct sppp *sp) 2571 { 2572 STDDCL; 2573 int i; 2574 uint32_t mask; 2575 2576 sp->pp_phase = SPPP_PHASE_TERMINATE; 2577 2578 if (debug) 2579 { 2580 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2581 sppp_phase_name(sp->pp_phase)); 2582 } 2583 2584 /* 2585 * Take upper layers down. We send the Down event first and 2586 * the Close second to prevent the upper layers from sending 2587 * ``a flurry of terminate-request packets'', as the RFC 2588 * describes it. 2589 */ 2590 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2591 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2592 (cps[i])->Down(sp); 2593 (cps[i])->Close(sp); 2594 } 2595 } 2596 2597 static void 2598 sppp_lcp_tls(struct sppp *sp) 2599 { 2600 STDDCL; 2601 2602 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2603 printf("%s: authentication failed %d times, not retrying again\n", 2604 sp->pp_if.if_xname, sp->pp_auth_failures); 2605 if_down(&sp->pp_if); 2606 return; 2607 } 2608 2609 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2610 2611 if (debug) 2612 { 2613 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2614 sppp_phase_name(sp->pp_phase)); 2615 } 2616 2617 /* Notify lower layer if desired. */ 2618 if (sp->pp_tls) 2619 (sp->pp_tls)(sp); 2620 } 2621 2622 static void 2623 sppp_lcp_tlf(struct sppp *sp) 2624 { 2625 STDDCL; 2626 2627 sp->pp_phase = SPPP_PHASE_DEAD; 2628 2629 if (debug) 2630 { 2631 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2632 sppp_phase_name(sp->pp_phase)); 2633 } 2634 2635 /* Notify lower layer if desired. */ 2636 if (sp->pp_tlf) 2637 (sp->pp_tlf)(sp); 2638 } 2639 2640 static void 2641 sppp_lcp_scr(struct sppp *sp) 2642 { 2643 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2644 int i = 0; 2645 u_short authproto; 2646 2647 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2648 if (! sp->lcp.magic) 2649 sp->lcp.magic = cprng_fast32(); 2650 opt[i++] = LCP_OPT_MAGIC; 2651 opt[i++] = 6; 2652 opt[i++] = sp->lcp.magic >> 24; 2653 opt[i++] = sp->lcp.magic >> 16; 2654 opt[i++] = sp->lcp.magic >> 8; 2655 opt[i++] = sp->lcp.magic; 2656 } 2657 2658 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2659 opt[i++] = LCP_OPT_MRU; 2660 opt[i++] = 4; 2661 opt[i++] = sp->lcp.mru >> 8; 2662 opt[i++] = sp->lcp.mru; 2663 } 2664 2665 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2666 authproto = sp->hisauth.proto; 2667 opt[i++] = LCP_OPT_AUTH_PROTO; 2668 opt[i++] = authproto == PPP_CHAP? 5: 4; 2669 opt[i++] = authproto >> 8; 2670 opt[i++] = authproto; 2671 if (authproto == PPP_CHAP) 2672 opt[i++] = CHAP_MD5; 2673 } 2674 2675 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2676 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2677 } 2678 2679 /* 2680 * Check the open NCPs, return true if at least one NCP is open. 2681 */ 2682 static int 2683 sppp_ncp_check(struct sppp *sp) 2684 { 2685 int i, mask; 2686 2687 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2688 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2689 return 1; 2690 return 0; 2691 } 2692 2693 /* 2694 * Re-check the open NCPs and see if we should terminate the link. 2695 * Called by the NCPs during their tlf action handling. 2696 */ 2697 static void 2698 sppp_lcp_check_and_close(struct sppp *sp) 2699 { 2700 2701 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2702 /* don't bother, we are already going down */ 2703 return; 2704 2705 if (sppp_ncp_check(sp)) 2706 return; 2707 2708 lcp.Close(sp); 2709 } 2710 2711 2712 /* 2713 *--------------------------------------------------------------------------* 2714 * * 2715 * The IPCP implementation. * 2716 * * 2717 *--------------------------------------------------------------------------* 2718 */ 2719 2720 static void 2721 sppp_ipcp_init(struct sppp *sp) 2722 { 2723 sp->ipcp.opts = 0; 2724 sp->ipcp.flags = 0; 2725 sp->state[IDX_IPCP] = STATE_INITIAL; 2726 sp->fail_counter[IDX_IPCP] = 0; 2727 sp->pp_seq[IDX_IPCP] = 0; 2728 sp->pp_rseq[IDX_IPCP] = 0; 2729 callout_init(&sp->ch[IDX_IPCP], 0); 2730 } 2731 2732 static void 2733 sppp_ipcp_up(struct sppp *sp) 2734 { 2735 sppp_up_event(&ipcp, sp); 2736 } 2737 2738 static void 2739 sppp_ipcp_down(struct sppp *sp) 2740 { 2741 sppp_down_event(&ipcp, sp); 2742 } 2743 2744 static void 2745 sppp_ipcp_open(struct sppp *sp) 2746 { 2747 STDDCL; 2748 uint32_t myaddr, hisaddr; 2749 2750 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2751 sp->ipcp.req_myaddr = 0; 2752 sp->ipcp.req_hisaddr = 0; 2753 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2754 2755 #ifdef INET 2756 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2757 #else 2758 myaddr = hisaddr = 0; 2759 #endif 2760 /* 2761 * If we don't have his address, this probably means our 2762 * interface doesn't want to talk IP at all. (This could 2763 * be the case if somebody wants to speak only IPX, for 2764 * example.) Don't open IPCP in this case. 2765 */ 2766 if (hisaddr == 0) { 2767 /* XXX this message should go away */ 2768 if (debug) 2769 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2770 ifp->if_xname); 2771 return; 2772 } 2773 2774 if (myaddr == 0) { 2775 /* 2776 * I don't have an assigned address, so i need to 2777 * negotiate my address. 2778 */ 2779 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2780 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2781 } 2782 if (hisaddr == 1) { 2783 /* 2784 * XXX - remove this hack! 2785 * remote has no valid address, we need to get one assigned. 2786 */ 2787 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2788 } 2789 sppp_open_event(&ipcp, sp); 2790 } 2791 2792 static void 2793 sppp_ipcp_close(struct sppp *sp) 2794 { 2795 STDDCL; 2796 2797 sppp_close_event(&ipcp, sp); 2798 #ifdef INET 2799 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2800 /* 2801 * Some address was dynamic, clear it again. 2802 */ 2803 sppp_clear_ip_addrs(sp); 2804 #endif 2805 2806 if (sp->pp_saved_mtu > 0) { 2807 ifp->if_mtu = sp->pp_saved_mtu; 2808 sp->pp_saved_mtu = 0; 2809 if (debug) 2810 log(LOG_DEBUG, 2811 "%s: resetting MTU to %" PRIu64 " bytes\n", 2812 ifp->if_xname, ifp->if_mtu); 2813 } 2814 } 2815 2816 static void 2817 sppp_ipcp_TO(void *cookie) 2818 { 2819 sppp_to_event(&ipcp, (struct sppp *)cookie); 2820 } 2821 2822 /* 2823 * Analyze a configure request. Return true if it was agreeable, and 2824 * caused action sca, false if it has been rejected or nak'ed, and 2825 * caused action scn. (The return value is used to make the state 2826 * transition decision in the state automaton.) 2827 */ 2828 static int 2829 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2830 { 2831 u_char *buf, *r, *p; 2832 struct ifnet *ifp = &sp->pp_if; 2833 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2834 uint32_t hisaddr, desiredaddr; 2835 2836 len -= 4; 2837 origlen = len; 2838 /* 2839 * Make sure to allocate a buf that can at least hold a 2840 * conf-nak with an `address' option. We might need it below. 2841 */ 2842 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2843 if (! buf) 2844 return (0); 2845 2846 /* pass 1: see if we can recognize them */ 2847 if (debug) 2848 log(LOG_DEBUG, "%s: ipcp parse opts:", 2849 ifp->if_xname); 2850 p = (void *)(h + 1); 2851 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2852 /* Sanity check option length */ 2853 if (p[1] > len) { 2854 /* XXX should we just RXJ? */ 2855 addlog("%s: malicious IPCP option received, dropping\n", 2856 ifp->if_xname); 2857 goto drop; 2858 } 2859 if (debug) 2860 addlog(" %s", sppp_ipcp_opt_name(*p)); 2861 switch (*p) { 2862 #ifdef notyet 2863 case IPCP_OPT_COMPRESSION: 2864 if (len >= 6 && p[1] >= 6) { 2865 /* correctly formed compress option */ 2866 continue; 2867 } 2868 if (debug) 2869 addlog(" [invalid]"); 2870 break; 2871 #endif 2872 case IPCP_OPT_ADDRESS: 2873 if (len >= 6 && p[1] == 6) { 2874 /* correctly formed address option */ 2875 continue; 2876 } 2877 if (debug) 2878 addlog(" [invalid]"); 2879 break; 2880 default: 2881 /* Others not supported. */ 2882 if (debug) 2883 addlog(" [rej]"); 2884 break; 2885 } 2886 /* Add the option to rejected list. */ 2887 bcopy (p, r, p[1]); 2888 r += p[1]; 2889 rlen += p[1]; 2890 } 2891 if (rlen) { 2892 if (debug) 2893 addlog(" send conf-rej\n"); 2894 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2895 goto end; 2896 } else if (debug) 2897 addlog("\n"); 2898 2899 /* pass 2: parse option values */ 2900 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2901 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2902 else 2903 #ifdef INET 2904 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2905 #else 2906 hisaddr = 0; 2907 #endif 2908 if (debug) 2909 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2910 ifp->if_xname); 2911 p = (void *)(h + 1); 2912 len = origlen; 2913 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2914 if (debug) 2915 addlog(" %s", sppp_ipcp_opt_name(*p)); 2916 switch (*p) { 2917 #ifdef notyet 2918 case IPCP_OPT_COMPRESSION: 2919 continue; 2920 #endif 2921 case IPCP_OPT_ADDRESS: 2922 desiredaddr = p[2] << 24 | p[3] << 16 | 2923 p[4] << 8 | p[5]; 2924 if (desiredaddr == hisaddr || 2925 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2926 /* 2927 * Peer's address is same as our value, 2928 * this is agreeable. Gonna conf-ack 2929 * it. 2930 */ 2931 if (debug) 2932 addlog(" %s [ack]", 2933 sppp_dotted_quad(hisaddr)); 2934 /* record that we've seen it already */ 2935 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2936 sp->ipcp.req_hisaddr = desiredaddr; 2937 hisaddr = desiredaddr; 2938 continue; 2939 } 2940 /* 2941 * The address wasn't agreeable. This is either 2942 * he sent us 0.0.0.0, asking to assign him an 2943 * address, or he send us another address not 2944 * matching our value. Either case, we gonna 2945 * conf-nak it with our value. 2946 */ 2947 if (debug) { 2948 if (desiredaddr == 0) 2949 addlog(" [addr requested]"); 2950 else 2951 addlog(" %s [not agreed]", 2952 sppp_dotted_quad(desiredaddr)); 2953 } 2954 2955 p[2] = hisaddr >> 24; 2956 p[3] = hisaddr >> 16; 2957 p[4] = hisaddr >> 8; 2958 p[5] = hisaddr; 2959 break; 2960 } 2961 /* Add the option to nak'ed list. */ 2962 bcopy (p, r, p[1]); 2963 r += p[1]; 2964 rlen += p[1]; 2965 } 2966 2967 /* 2968 * If we are about to conf-ack the request, but haven't seen 2969 * his address so far, gonna conf-nak it instead, with the 2970 * `address' option present and our idea of his address being 2971 * filled in there, to request negotiation of both addresses. 2972 * 2973 * XXX This can result in an endless req - nak loop if peer 2974 * doesn't want to send us his address. Q: What should we do 2975 * about it? XXX A: implement the max-failure counter. 2976 */ 2977 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2978 buf[0] = IPCP_OPT_ADDRESS; 2979 buf[1] = 6; 2980 buf[2] = hisaddr >> 24; 2981 buf[3] = hisaddr >> 16; 2982 buf[4] = hisaddr >> 8; 2983 buf[5] = hisaddr; 2984 rlen = 6; 2985 if (debug) 2986 addlog(" still need hisaddr"); 2987 } 2988 2989 if (rlen) { 2990 if (debug) 2991 addlog(" send conf-nak\n"); 2992 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2993 } else { 2994 if (debug) 2995 addlog(" send conf-ack\n"); 2996 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2997 } 2998 2999 end: 3000 free(buf, M_TEMP); 3001 return (rlen == 0); 3002 3003 drop: 3004 free(buf, M_TEMP); 3005 return -1; 3006 } 3007 3008 /* 3009 * Analyze the IPCP Configure-Reject option list, and adjust our 3010 * negotiation. 3011 */ 3012 static void 3013 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3014 { 3015 u_char *buf, *p; 3016 struct ifnet *ifp = &sp->pp_if; 3017 int debug = ifp->if_flags & IFF_DEBUG; 3018 3019 len -= 4; 3020 buf = malloc (len, M_TEMP, M_NOWAIT); 3021 if (!buf) 3022 return; 3023 3024 if (debug) 3025 log(LOG_DEBUG, "%s: ipcp rej opts:", 3026 ifp->if_xname); 3027 3028 p = (void *)(h + 1); 3029 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3030 /* Sanity check option length */ 3031 if (p[1] > len) { 3032 /* XXX should we just RXJ? */ 3033 addlog("%s: malicious IPCP option received, dropping\n", 3034 ifp->if_xname); 3035 goto drop; 3036 } 3037 if (debug) 3038 addlog(" %s", sppp_ipcp_opt_name(*p)); 3039 switch (*p) { 3040 case IPCP_OPT_ADDRESS: 3041 /* 3042 * Peer doesn't grok address option. This is 3043 * bad. XXX Should we better give up here? 3044 */ 3045 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3046 break; 3047 #ifdef notyet 3048 case IPCP_OPT_COMPRESS: 3049 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3050 break; 3051 #endif 3052 } 3053 } 3054 if (debug) 3055 addlog("\n"); 3056 drop: 3057 free(buf, M_TEMP); 3058 return; 3059 } 3060 3061 /* 3062 * Analyze the IPCP Configure-NAK option list, and adjust our 3063 * negotiation. 3064 */ 3065 static void 3066 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3067 { 3068 u_char *p; 3069 struct ifnet *ifp = &sp->pp_if; 3070 int debug = ifp->if_flags & IFF_DEBUG; 3071 uint32_t wantaddr; 3072 3073 len -= 4; 3074 3075 if (debug) 3076 log(LOG_DEBUG, "%s: ipcp nak opts:", 3077 ifp->if_xname); 3078 3079 p = (void *)(h + 1); 3080 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3081 /* Sanity check option length */ 3082 if (p[1] > len) { 3083 /* XXX should we just RXJ? */ 3084 addlog("%s: malicious IPCP option received, dropping\n", 3085 ifp->if_xname); 3086 return; 3087 } 3088 if (debug) 3089 addlog(" %s", sppp_ipcp_opt_name(*p)); 3090 switch (*p) { 3091 case IPCP_OPT_ADDRESS: 3092 /* 3093 * Peer doesn't like our local IP address. See 3094 * if we can do something for him. We'll drop 3095 * him our address then. 3096 */ 3097 if (len >= 6 && p[1] == 6) { 3098 wantaddr = p[2] << 24 | p[3] << 16 | 3099 p[4] << 8 | p[5]; 3100 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3101 if (debug) 3102 addlog(" [wantaddr %s]", 3103 sppp_dotted_quad(wantaddr)); 3104 /* 3105 * When doing dynamic address assignment, 3106 * we accept his offer. Otherwise, we 3107 * ignore it and thus continue to negotiate 3108 * our already existing value. 3109 */ 3110 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3111 if (debug) 3112 addlog(" [agree]"); 3113 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3114 sp->ipcp.req_myaddr = wantaddr; 3115 } 3116 } 3117 break; 3118 3119 case IPCP_OPT_PRIMDNS: 3120 if (len >= 6 && p[1] == 6) { 3121 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3122 p[4] << 8 | p[5]; 3123 } 3124 break; 3125 3126 case IPCP_OPT_SECDNS: 3127 if (len >= 6 && p[1] == 6) { 3128 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3129 p[4] << 8 | p[5]; 3130 } 3131 break; 3132 #ifdef notyet 3133 case IPCP_OPT_COMPRESS: 3134 /* 3135 * Peer wants different compression parameters. 3136 */ 3137 break; 3138 #endif 3139 } 3140 } 3141 if (debug) 3142 addlog("\n"); 3143 } 3144 3145 static void 3146 sppp_ipcp_tlu(struct sppp *sp) 3147 { 3148 #ifdef INET 3149 /* we are up. Set addresses and notify anyone interested */ 3150 STDDCL; 3151 uint32_t myaddr, hisaddr; 3152 3153 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3154 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3155 myaddr = sp->ipcp.req_myaddr; 3156 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3157 hisaddr = sp->ipcp.req_hisaddr; 3158 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3159 3160 if (ifp->if_mtu > sp->lcp.their_mru) { 3161 sp->pp_saved_mtu = ifp->if_mtu; 3162 ifp->if_mtu = sp->lcp.their_mru; 3163 if (debug) 3164 log(LOG_DEBUG, 3165 "%s: setting MTU to %" PRIu64 " bytes\n", 3166 ifp->if_xname, ifp->if_mtu); 3167 } 3168 3169 if (sp->pp_con) 3170 sp->pp_con(sp); 3171 #endif 3172 } 3173 3174 static void 3175 sppp_ipcp_tld(struct sppp *sp) 3176 { 3177 } 3178 3179 static void 3180 sppp_ipcp_tls(struct sppp *sp) 3181 { 3182 /* indicate to LCP that it must stay alive */ 3183 sp->lcp.protos |= (1 << IDX_IPCP); 3184 } 3185 3186 static void 3187 sppp_ipcp_tlf(struct sppp *sp) 3188 { 3189 /* we no longer need LCP */ 3190 sp->lcp.protos &= ~(1 << IDX_IPCP); 3191 } 3192 3193 static void 3194 sppp_ipcp_scr(struct sppp *sp) 3195 { 3196 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3197 #ifdef INET 3198 uint32_t ouraddr; 3199 #endif 3200 int i = 0; 3201 3202 #ifdef notyet 3203 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3204 opt[i++] = IPCP_OPT_COMPRESSION; 3205 opt[i++] = 6; 3206 opt[i++] = 0; /* VJ header compression */ 3207 opt[i++] = 0x2d; /* VJ header compression */ 3208 opt[i++] = max_slot_id; 3209 opt[i++] = comp_slot_id; 3210 } 3211 #endif 3212 3213 #ifdef INET 3214 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3215 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3216 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3217 else 3218 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3219 opt[i++] = IPCP_OPT_ADDRESS; 3220 opt[i++] = 6; 3221 opt[i++] = ouraddr >> 24; 3222 opt[i++] = ouraddr >> 16; 3223 opt[i++] = ouraddr >> 8; 3224 opt[i++] = ouraddr; 3225 } 3226 #endif 3227 3228 if (sp->query_dns & 1) { 3229 opt[i++] = IPCP_OPT_PRIMDNS; 3230 opt[i++] = 6; 3231 opt[i++] = sp->dns_addrs[0] >> 24; 3232 opt[i++] = sp->dns_addrs[0] >> 16; 3233 opt[i++] = sp->dns_addrs[0] >> 8; 3234 opt[i++] = sp->dns_addrs[0]; 3235 } 3236 if (sp->query_dns & 2) { 3237 opt[i++] = IPCP_OPT_SECDNS; 3238 opt[i++] = 6; 3239 opt[i++] = sp->dns_addrs[1] >> 24; 3240 opt[i++] = sp->dns_addrs[1] >> 16; 3241 opt[i++] = sp->dns_addrs[1] >> 8; 3242 opt[i++] = sp->dns_addrs[1]; 3243 } 3244 3245 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3246 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3247 } 3248 3249 3250 /* 3251 *--------------------------------------------------------------------------* 3252 * * 3253 * The IPv6CP implementation. * 3254 * * 3255 *--------------------------------------------------------------------------* 3256 */ 3257 3258 #ifdef INET6 3259 static void 3260 sppp_ipv6cp_init(struct sppp *sp) 3261 { 3262 sp->ipv6cp.opts = 0; 3263 sp->ipv6cp.flags = 0; 3264 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3265 sp->fail_counter[IDX_IPV6CP] = 0; 3266 sp->pp_seq[IDX_IPV6CP] = 0; 3267 sp->pp_rseq[IDX_IPV6CP] = 0; 3268 callout_init(&sp->ch[IDX_IPV6CP], 0); 3269 } 3270 3271 static void 3272 sppp_ipv6cp_up(struct sppp *sp) 3273 { 3274 sppp_up_event(&ipv6cp, sp); 3275 } 3276 3277 static void 3278 sppp_ipv6cp_down(struct sppp *sp) 3279 { 3280 sppp_down_event(&ipv6cp, sp); 3281 } 3282 3283 static void 3284 sppp_ipv6cp_open(struct sppp *sp) 3285 { 3286 STDDCL; 3287 struct in6_addr myaddr, hisaddr; 3288 3289 #ifdef IPV6CP_MYIFID_DYN 3290 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3291 #else 3292 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3293 #endif 3294 3295 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3296 /* 3297 * If we don't have our address, this probably means our 3298 * interface doesn't want to talk IPv6 at all. (This could 3299 * be the case if somebody wants to speak only IPX, for 3300 * example.) Don't open IPv6CP in this case. 3301 */ 3302 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3303 /* XXX this message should go away */ 3304 if (debug) 3305 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3306 ifp->if_xname); 3307 return; 3308 } 3309 3310 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3311 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3312 sppp_open_event(&ipv6cp, sp); 3313 } 3314 3315 static void 3316 sppp_ipv6cp_close(struct sppp *sp) 3317 { 3318 sppp_close_event(&ipv6cp, sp); 3319 } 3320 3321 static void 3322 sppp_ipv6cp_TO(void *cookie) 3323 { 3324 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3325 } 3326 3327 /* 3328 * Analyze a configure request. Return true if it was agreeable, and 3329 * caused action sca, false if it has been rejected or nak'ed, and 3330 * caused action scn. (The return value is used to make the state 3331 * transition decision in the state automaton.) 3332 */ 3333 static int 3334 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3335 { 3336 u_char *buf, *r, *p; 3337 struct ifnet *ifp = &sp->pp_if; 3338 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3339 struct in6_addr myaddr, desiredaddr, suggestaddr; 3340 int ifidcount; 3341 int type; 3342 int collision, nohisaddr; 3343 3344 len -= 4; 3345 origlen = len; 3346 /* 3347 * Make sure to allocate a buf that can at least hold a 3348 * conf-nak with an `address' option. We might need it below. 3349 */ 3350 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3351 if (! buf) 3352 return (0); 3353 3354 /* pass 1: see if we can recognize them */ 3355 if (debug) 3356 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3357 ifp->if_xname); 3358 p = (void *)(h + 1); 3359 ifidcount = 0; 3360 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3361 /* Sanity check option length */ 3362 if (p[1] > len) { 3363 /* XXX just RXJ? */ 3364 addlog("%s: received malicious IPCPv6 option, " 3365 "dropping\n", ifp->if_xname); 3366 goto drop; 3367 } 3368 if (debug) 3369 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3370 switch (*p) { 3371 case IPV6CP_OPT_IFID: 3372 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3373 /* correctly formed address option */ 3374 ifidcount++; 3375 continue; 3376 } 3377 if (debug) 3378 addlog(" [invalid]"); 3379 break; 3380 #ifdef notyet 3381 case IPV6CP_OPT_COMPRESSION: 3382 if (len >= 4 && p[1] >= 4) { 3383 /* correctly formed compress option */ 3384 continue; 3385 } 3386 if (debug) 3387 addlog(" [invalid]"); 3388 break; 3389 #endif 3390 default: 3391 /* Others not supported. */ 3392 if (debug) 3393 addlog(" [rej]"); 3394 break; 3395 } 3396 /* Add the option to rejected list. */ 3397 bcopy (p, r, p[1]); 3398 r += p[1]; 3399 rlen += p[1]; 3400 } 3401 if (rlen) { 3402 if (debug) 3403 addlog(" send conf-rej\n"); 3404 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3405 goto end; 3406 } else if (debug) 3407 addlog("\n"); 3408 3409 /* pass 2: parse option values */ 3410 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3411 if (debug) 3412 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3413 ifp->if_xname); 3414 p = (void *)(h + 1); 3415 len = origlen; 3416 type = CONF_ACK; 3417 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3418 if (debug) 3419 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3420 switch (*p) { 3421 #ifdef notyet 3422 case IPV6CP_OPT_COMPRESSION: 3423 continue; 3424 #endif 3425 case IPV6CP_OPT_IFID: 3426 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3427 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3428 collision = (memcmp(&desiredaddr.s6_addr[8], 3429 &myaddr.s6_addr[8], 8) == 0); 3430 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3431 3432 desiredaddr.s6_addr16[0] = htons(0xfe80); 3433 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3434 3435 if (!collision && !nohisaddr) { 3436 /* no collision, hisaddr known - Conf-Ack */ 3437 type = CONF_ACK; 3438 3439 if (debug) { 3440 addlog(" %s [%s]", 3441 ip6_sprintf(&desiredaddr), 3442 sppp_cp_type_name(type)); 3443 } 3444 continue; 3445 } 3446 3447 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3448 if (collision && nohisaddr) { 3449 /* collision, hisaddr unknown - Conf-Rej */ 3450 type = CONF_REJ; 3451 memset(&p[2], 0, 8); 3452 } else { 3453 /* 3454 * - no collision, hisaddr unknown, or 3455 * - collision, hisaddr known 3456 * Conf-Nak, suggest hisaddr 3457 */ 3458 type = CONF_NAK; 3459 sppp_suggest_ip6_addr(sp, &suggestaddr); 3460 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3461 } 3462 if (debug) 3463 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3464 sppp_cp_type_name(type)); 3465 break; 3466 } 3467 /* Add the option to nak'ed list. */ 3468 bcopy (p, r, p[1]); 3469 r += p[1]; 3470 rlen += p[1]; 3471 } 3472 3473 if (rlen == 0 && type == CONF_ACK) { 3474 if (debug) 3475 addlog(" send %s\n", sppp_cp_type_name(type)); 3476 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3477 } else { 3478 #ifdef notdef 3479 if (type == CONF_ACK) 3480 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3481 #endif 3482 3483 if (debug) { 3484 addlog(" send %s suggest %s\n", 3485 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3486 } 3487 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3488 } 3489 3490 end: 3491 free(buf, M_TEMP); 3492 return (rlen == 0); 3493 3494 drop: 3495 free(buf, M_TEMP); 3496 return -1; 3497 } 3498 3499 /* 3500 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3501 * negotiation. 3502 */ 3503 static void 3504 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3505 { 3506 u_char *buf, *p; 3507 struct ifnet *ifp = &sp->pp_if; 3508 int debug = ifp->if_flags & IFF_DEBUG; 3509 3510 len -= 4; 3511 buf = malloc (len, M_TEMP, M_NOWAIT); 3512 if (!buf) 3513 return; 3514 3515 if (debug) 3516 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3517 ifp->if_xname); 3518 3519 p = (void *)(h + 1); 3520 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3521 if (p[1] > len) { 3522 /* XXX just RXJ? */ 3523 addlog("%s: received malicious IPCPv6 option, " 3524 "dropping\n", ifp->if_xname); 3525 goto drop; 3526 } 3527 if (debug) 3528 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3529 switch (*p) { 3530 case IPV6CP_OPT_IFID: 3531 /* 3532 * Peer doesn't grok address option. This is 3533 * bad. XXX Should we better give up here? 3534 */ 3535 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3536 break; 3537 #ifdef notyet 3538 case IPV6CP_OPT_COMPRESS: 3539 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3540 break; 3541 #endif 3542 } 3543 } 3544 if (debug) 3545 addlog("\n"); 3546 drop: 3547 free(buf, M_TEMP); 3548 return; 3549 } 3550 3551 /* 3552 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3553 * negotiation. 3554 */ 3555 static void 3556 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3557 { 3558 u_char *buf, *p; 3559 struct ifnet *ifp = &sp->pp_if; 3560 int debug = ifp->if_flags & IFF_DEBUG; 3561 struct in6_addr suggestaddr; 3562 3563 len -= 4; 3564 buf = malloc (len, M_TEMP, M_NOWAIT); 3565 if (!buf) 3566 return; 3567 3568 if (debug) 3569 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3570 ifp->if_xname); 3571 3572 p = (void *)(h + 1); 3573 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3574 if (p[1] > len) { 3575 /* XXX just RXJ? */ 3576 addlog("%s: received malicious IPCPv6 option, " 3577 "dropping\n", ifp->if_xname); 3578 goto drop; 3579 } 3580 if (debug) 3581 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3582 switch (*p) { 3583 case IPV6CP_OPT_IFID: 3584 /* 3585 * Peer doesn't like our local ifid. See 3586 * if we can do something for him. We'll drop 3587 * him our address then. 3588 */ 3589 if (len < 10 || p[1] != 10) 3590 break; 3591 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3592 suggestaddr.s6_addr16[0] = htons(0xfe80); 3593 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3594 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3595 3596 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3597 if (debug) 3598 addlog(" [suggestaddr %s]", 3599 ip6_sprintf(&suggestaddr)); 3600 #ifdef IPV6CP_MYIFID_DYN 3601 /* 3602 * When doing dynamic address assignment, 3603 * we accept his offer. 3604 */ 3605 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3606 struct in6_addr lastsuggest; 3607 /* 3608 * If <suggested myaddr from peer> equals to 3609 * <hisaddr we have suggested last time>, 3610 * we have a collision. generate new random 3611 * ifid. 3612 */ 3613 sppp_suggest_ip6_addr(&lastsuggest); 3614 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3615 lastsuggest)) { 3616 if (debug) 3617 addlog(" [random]"); 3618 sppp_gen_ip6_addr(sp, &suggestaddr); 3619 } 3620 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3621 if (debug) 3622 addlog(" [agree]"); 3623 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3624 } 3625 #else 3626 /* 3627 * Since we do not do dynamic address assignment, 3628 * we ignore it and thus continue to negotiate 3629 * our already existing value. This can possibly 3630 * go into infinite request-reject loop. 3631 * 3632 * This is not likely because we normally use 3633 * ifid based on MAC-address. 3634 * If you have no ethernet card on the node, too bad. 3635 * XXX should we use fail_counter? 3636 */ 3637 #endif 3638 break; 3639 #ifdef notyet 3640 case IPV6CP_OPT_COMPRESS: 3641 /* 3642 * Peer wants different compression parameters. 3643 */ 3644 break; 3645 #endif 3646 } 3647 } 3648 if (debug) 3649 addlog("\n"); 3650 drop: 3651 free(buf, M_TEMP); 3652 return; 3653 } 3654 3655 static void 3656 sppp_ipv6cp_tlu(struct sppp *sp) 3657 { 3658 /* we are up - notify isdn daemon */ 3659 if (sp->pp_con) 3660 sp->pp_con(sp); 3661 } 3662 3663 static void 3664 sppp_ipv6cp_tld(struct sppp *sp) 3665 { 3666 } 3667 3668 static void 3669 sppp_ipv6cp_tls(struct sppp *sp) 3670 { 3671 /* indicate to LCP that it must stay alive */ 3672 sp->lcp.protos |= (1 << IDX_IPV6CP); 3673 } 3674 3675 static void 3676 sppp_ipv6cp_tlf(struct sppp *sp) 3677 { 3678 /* we no longer need LCP */ 3679 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3680 } 3681 3682 static void 3683 sppp_ipv6cp_scr(struct sppp *sp) 3684 { 3685 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3686 struct in6_addr ouraddr; 3687 int i = 0; 3688 3689 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3690 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3691 opt[i++] = IPV6CP_OPT_IFID; 3692 opt[i++] = 10; 3693 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3694 i += 8; 3695 } 3696 3697 #ifdef notyet 3698 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3699 opt[i++] = IPV6CP_OPT_COMPRESSION; 3700 opt[i++] = 4; 3701 opt[i++] = 0; /* TBD */ 3702 opt[i++] = 0; /* TBD */ 3703 /* variable length data may follow */ 3704 } 3705 #endif 3706 3707 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3708 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3709 } 3710 #else /*INET6*/ 3711 static void 3712 sppp_ipv6cp_init(struct sppp *sp) 3713 { 3714 } 3715 3716 static void 3717 sppp_ipv6cp_up(struct sppp *sp) 3718 { 3719 } 3720 3721 static void 3722 sppp_ipv6cp_down(struct sppp *sp) 3723 { 3724 } 3725 3726 static void 3727 sppp_ipv6cp_open(struct sppp *sp) 3728 { 3729 } 3730 3731 static void 3732 sppp_ipv6cp_close(struct sppp *sp) 3733 { 3734 } 3735 3736 static void 3737 sppp_ipv6cp_TO(void *sp) 3738 { 3739 } 3740 3741 static int 3742 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3743 int len) 3744 { 3745 return 0; 3746 } 3747 3748 static void 3749 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3750 int len) 3751 { 3752 } 3753 3754 static void 3755 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3756 int len) 3757 { 3758 } 3759 3760 static void 3761 sppp_ipv6cp_tlu(struct sppp *sp) 3762 { 3763 } 3764 3765 static void 3766 sppp_ipv6cp_tld(struct sppp *sp) 3767 { 3768 } 3769 3770 static void 3771 sppp_ipv6cp_tls(struct sppp *sp) 3772 { 3773 } 3774 3775 static void 3776 sppp_ipv6cp_tlf(struct sppp *sp) 3777 { 3778 } 3779 3780 static void 3781 sppp_ipv6cp_scr(struct sppp *sp) 3782 { 3783 } 3784 #endif /*INET6*/ 3785 3786 3787 /* 3788 *--------------------------------------------------------------------------* 3789 * * 3790 * The CHAP implementation. * 3791 * * 3792 *--------------------------------------------------------------------------* 3793 */ 3794 3795 /* 3796 * The authentication protocols don't employ a full-fledged state machine as 3797 * the control protocols do, since they do have Open and Close events, but 3798 * not Up and Down, nor are they explicitly terminated. Also, use of the 3799 * authentication protocols may be different in both directions (this makes 3800 * sense, think of a machine that never accepts incoming calls but only 3801 * calls out, it doesn't require the called party to authenticate itself). 3802 * 3803 * Our state machine for the local authentication protocol (we are requesting 3804 * the peer to authenticate) looks like: 3805 * 3806 * RCA- 3807 * +--------------------------------------------+ 3808 * V scn,tld| 3809 * +--------+ Close +---------+ RCA+ 3810 * | |<----------------------------------| |------+ 3811 * +--->| Closed | TO* | Opened | sca | 3812 * | | |-----+ +-------| |<-----+ 3813 * | +--------+ irc | | +---------+ 3814 * | ^ | | ^ 3815 * | | | | | 3816 * | | | | | 3817 * | TO-| | | | 3818 * | |tld TO+ V | | 3819 * | | +------->+ | | 3820 * | | | | | | 3821 * | +--------+ V | | 3822 * | | |<----+<--------------------+ | 3823 * | | Req- | scr | 3824 * | | Sent | | 3825 * | | | | 3826 * | +--------+ | 3827 * | RCA- | | RCA+ | 3828 * +------+ +------------------------------------------+ 3829 * scn,tld sca,irc,ict,tlu 3830 * 3831 * 3832 * with: 3833 * 3834 * Open: LCP reached authentication phase 3835 * Close: LCP reached terminate phase 3836 * 3837 * RCA+: received reply (pap-req, chap-response), acceptable 3838 * RCN: received reply (pap-req, chap-response), not acceptable 3839 * TO+: timeout with restart counter >= 0 3840 * TO-: timeout with restart counter < 0 3841 * TO*: reschedule timeout for CHAP 3842 * 3843 * scr: send request packet (none for PAP, chap-challenge) 3844 * sca: send ack packet (pap-ack, chap-success) 3845 * scn: send nak packet (pap-nak, chap-failure) 3846 * ict: initialize re-challenge timer (CHAP only) 3847 * 3848 * tlu: this-layer-up, LCP reaches network phase 3849 * tld: this-layer-down, LCP enters terminate phase 3850 * 3851 * Note that in CHAP mode, after sending a new challenge, while the state 3852 * automaton falls back into Req-Sent state, it doesn't signal a tld 3853 * event to LCP, so LCP remains in network phase. Only after not getting 3854 * any response (or after getting an unacceptable response), CHAP closes, 3855 * causing LCP to enter terminate phase. 3856 * 3857 * With PAP, there is no initial request that can be sent. The peer is 3858 * expected to send one based on the successful negotiation of PAP as 3859 * the authentication protocol during the LCP option negotiation. 3860 * 3861 * Incoming authentication protocol requests (remote requests 3862 * authentication, we are peer) don't employ a state machine at all, 3863 * they are simply answered. Some peers [Ascend P50 firmware rev 3864 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3865 * still in authentication phase (thereby violating the standard that 3866 * demands that these NCP packets are to be discarded), so we keep 3867 * track of the peer demanding us to authenticate, and only proceed to 3868 * phase network once we've seen a positive acknowledge for the 3869 * authentication. 3870 */ 3871 3872 /* 3873 * Handle incoming CHAP packets. 3874 */ 3875 void 3876 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3877 { 3878 STDDCL; 3879 struct lcp_header *h; 3880 int len, x; 3881 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3882 int value_len, name_len; 3883 MD5_CTX ctx; 3884 3885 len = m->m_pkthdr.len; 3886 if (len < 4) { 3887 if (debug) 3888 log(LOG_DEBUG, 3889 "%s: chap invalid packet length: %d bytes\n", 3890 ifp->if_xname, len); 3891 return; 3892 } 3893 h = mtod(m, struct lcp_header *); 3894 if (len > ntohs(h->len)) 3895 len = ntohs(h->len); 3896 3897 switch (h->type) { 3898 /* challenge, failure and success are his authproto */ 3899 case CHAP_CHALLENGE: 3900 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3901 /* can't do anything useful */ 3902 sp->pp_auth_failures++; 3903 printf("%s: chap input without my name and my secret being set\n", 3904 ifp->if_xname); 3905 break; 3906 } 3907 value = 1 + (u_char *)(h + 1); 3908 value_len = value[-1]; 3909 name = value + value_len; 3910 name_len = len - value_len - 5; 3911 if (name_len < 0) { 3912 if (debug) { 3913 log(LOG_DEBUG, 3914 "%s: chap corrupted challenge " 3915 "<%s id=0x%x len=%d", 3916 ifp->if_xname, 3917 sppp_auth_type_name(PPP_CHAP, h->type), 3918 h->ident, ntohs(h->len)); 3919 if (len > 4) 3920 sppp_print_bytes((u_char *)(h + 1), 3921 len - 4); 3922 addlog(">\n"); 3923 } 3924 break; 3925 } 3926 3927 if (debug) { 3928 log(LOG_DEBUG, 3929 "%s: chap input <%s id=0x%x len=%d name=", 3930 ifp->if_xname, 3931 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3932 ntohs(h->len)); 3933 sppp_print_string((char *) name, name_len); 3934 addlog(" value-size=%d value=", value_len); 3935 sppp_print_bytes(value, value_len); 3936 addlog(">\n"); 3937 } 3938 3939 /* Compute reply value. */ 3940 MD5Init(&ctx); 3941 MD5Update(&ctx, &h->ident, 1); 3942 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3943 MD5Update(&ctx, value, value_len); 3944 MD5Final(digest, &ctx); 3945 dsize = sizeof digest; 3946 3947 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3948 sizeof dsize, (const char *)&dsize, 3949 sizeof digest, digest, 3950 sp->myauth.name_len, 3951 sp->myauth.name, 3952 0); 3953 break; 3954 3955 case CHAP_SUCCESS: 3956 if (debug) { 3957 log(LOG_DEBUG, "%s: chap success", 3958 ifp->if_xname); 3959 if (len > 4) { 3960 addlog(": "); 3961 sppp_print_string((char *)(h + 1), len - 4); 3962 } 3963 addlog("\n"); 3964 } 3965 x = splnet(); 3966 sp->pp_auth_failures = 0; 3967 sp->pp_flags &= ~PP_NEEDAUTH; 3968 if (sp->myauth.proto == PPP_CHAP && 3969 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3970 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3971 /* 3972 * We are authenticator for CHAP but didn't 3973 * complete yet. Leave it to tlu to proceed 3974 * to network phase. 3975 */ 3976 splx(x); 3977 break; 3978 } 3979 splx(x); 3980 sppp_phase_network(sp); 3981 break; 3982 3983 case CHAP_FAILURE: 3984 x = splnet(); 3985 sp->pp_auth_failures++; 3986 splx(x); 3987 if (debug) { 3988 log(LOG_INFO, "%s: chap failure", 3989 ifp->if_xname); 3990 if (len > 4) { 3991 addlog(": "); 3992 sppp_print_string((char *)(h + 1), len - 4); 3993 } 3994 addlog("\n"); 3995 } else 3996 log(LOG_INFO, "%s: chap failure\n", 3997 ifp->if_xname); 3998 /* await LCP shutdown by authenticator */ 3999 break; 4000 4001 /* response is my authproto */ 4002 case CHAP_RESPONSE: 4003 if (sp->hisauth.secret == NULL) { 4004 /* can't do anything useful */ 4005 printf("%s: chap input without his secret being set\n", 4006 ifp->if_xname); 4007 break; 4008 } 4009 value = 1 + (u_char *)(h + 1); 4010 value_len = value[-1]; 4011 name = value + value_len; 4012 name_len = len - value_len - 5; 4013 if (name_len < 0) { 4014 if (debug) { 4015 log(LOG_DEBUG, 4016 "%s: chap corrupted response " 4017 "<%s id=0x%x len=%d", 4018 ifp->if_xname, 4019 sppp_auth_type_name(PPP_CHAP, h->type), 4020 h->ident, ntohs(h->len)); 4021 if (len > 4) 4022 sppp_print_bytes((u_char *)(h + 1), 4023 len - 4); 4024 addlog(">\n"); 4025 } 4026 break; 4027 } 4028 if (h->ident != sp->confid[IDX_CHAP]) { 4029 if (debug) 4030 log(LOG_DEBUG, 4031 "%s: chap dropping response for old ID " 4032 "(got %d, expected %d)\n", 4033 ifp->if_xname, 4034 h->ident, sp->confid[IDX_CHAP]); 4035 break; 4036 } 4037 if (sp->hisauth.name != NULL && 4038 (name_len != sp->hisauth.name_len 4039 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4040 log(LOG_INFO, "%s: chap response, his name ", 4041 ifp->if_xname); 4042 sppp_print_string(name, name_len); 4043 addlog(" != expected "); 4044 sppp_print_string(sp->hisauth.name, 4045 sp->hisauth.name_len); 4046 addlog("\n"); 4047 goto chap_failure; 4048 } 4049 if (debug) { 4050 log(LOG_DEBUG, "%s: chap input(%s) " 4051 "<%s id=0x%x len=%d name=", 4052 ifp->if_xname, 4053 sppp_state_name(sp->state[IDX_CHAP]), 4054 sppp_auth_type_name(PPP_CHAP, h->type), 4055 h->ident, ntohs(h->len)); 4056 sppp_print_string((char *)name, name_len); 4057 addlog(" value-size=%d value=", value_len); 4058 sppp_print_bytes(value, value_len); 4059 addlog(">\n"); 4060 } 4061 if (value_len != sizeof(sp->myauth.challenge)) { 4062 if (debug) 4063 log(LOG_DEBUG, 4064 "%s: chap bad hash value length: " 4065 "%d bytes, should be %ld\n", 4066 ifp->if_xname, value_len, 4067 (long) sizeof(sp->myauth.challenge)); 4068 goto chap_failure; 4069 } 4070 4071 MD5Init(&ctx); 4072 MD5Update(&ctx, &h->ident, 1); 4073 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4074 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4075 MD5Final(digest, &ctx); 4076 4077 #define FAILMSG "Failed..." 4078 #define SUCCMSG "Welcome!" 4079 4080 if (value_len != sizeof digest || 4081 memcmp(digest, value, value_len) != 0) { 4082 chap_failure: 4083 /* action scn, tld */ 4084 x = splnet(); 4085 sp->pp_auth_failures++; 4086 splx(x); 4087 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4088 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4089 0); 4090 chap.tld(sp); 4091 break; 4092 } 4093 sp->pp_auth_failures = 0; 4094 /* action sca, perhaps tlu */ 4095 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4096 sp->state[IDX_CHAP] == STATE_OPENED) 4097 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4098 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4099 0); 4100 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4101 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4102 chap.tlu(sp); 4103 } 4104 break; 4105 4106 default: 4107 /* Unknown CHAP packet type -- ignore. */ 4108 if (debug) { 4109 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4110 "<0x%x id=0x%xh len=%d", 4111 ifp->if_xname, 4112 sppp_state_name(sp->state[IDX_CHAP]), 4113 h->type, h->ident, ntohs(h->len)); 4114 if (len > 4) 4115 sppp_print_bytes((u_char *)(h + 1), len - 4); 4116 addlog(">\n"); 4117 } 4118 break; 4119 4120 } 4121 } 4122 4123 static void 4124 sppp_chap_init(struct sppp *sp) 4125 { 4126 /* Chap doesn't have STATE_INITIAL at all. */ 4127 sp->state[IDX_CHAP] = STATE_CLOSED; 4128 sp->fail_counter[IDX_CHAP] = 0; 4129 sp->pp_seq[IDX_CHAP] = 0; 4130 sp->pp_rseq[IDX_CHAP] = 0; 4131 callout_init(&sp->ch[IDX_CHAP], 0); 4132 } 4133 4134 static void 4135 sppp_chap_open(struct sppp *sp) 4136 { 4137 if (sp->myauth.proto == PPP_CHAP && 4138 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4139 /* we are authenticator for CHAP, start it */ 4140 chap.scr(sp); 4141 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4142 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4143 } 4144 /* nothing to be done if we are peer, await a challenge */ 4145 } 4146 4147 static void 4148 sppp_chap_close(struct sppp *sp) 4149 { 4150 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4151 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4152 } 4153 4154 static void 4155 sppp_chap_TO(void *cookie) 4156 { 4157 struct sppp *sp = (struct sppp *)cookie; 4158 STDDCL; 4159 int s; 4160 4161 s = splnet(); 4162 if (debug) 4163 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4164 ifp->if_xname, 4165 sppp_state_name(sp->state[IDX_CHAP]), 4166 sp->rst_counter[IDX_CHAP]); 4167 4168 if (--sp->rst_counter[IDX_CHAP] < 0) 4169 /* TO- event */ 4170 switch (sp->state[IDX_CHAP]) { 4171 case STATE_REQ_SENT: 4172 chap.tld(sp); 4173 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4174 break; 4175 } 4176 else 4177 /* TO+ (or TO*) event */ 4178 switch (sp->state[IDX_CHAP]) { 4179 case STATE_OPENED: 4180 /* TO* event */ 4181 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4182 /* fall through */ 4183 case STATE_REQ_SENT: 4184 chap.scr(sp); 4185 /* sppp_cp_change_state() will restart the timer */ 4186 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4187 break; 4188 } 4189 4190 splx(s); 4191 } 4192 4193 static void 4194 sppp_chap_tlu(struct sppp *sp) 4195 { 4196 STDDCL; 4197 int i, x; 4198 4199 i = 0; 4200 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4201 4202 /* 4203 * Some broken CHAP implementations (Conware CoNet, firmware 4204 * 4.0.?) don't want to re-authenticate their CHAP once the 4205 * initial challenge-response exchange has taken place. 4206 * Provide for an option to avoid rechallenges. 4207 */ 4208 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4209 /* 4210 * Compute the re-challenge timeout. This will yield 4211 * a number between 300 and 810 seconds. 4212 */ 4213 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4214 4215 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4216 } 4217 4218 if (debug) { 4219 log(LOG_DEBUG, 4220 "%s: chap %s, ", 4221 ifp->if_xname, 4222 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4223 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4224 addlog("next re-challenge in %d seconds\n", i); 4225 else 4226 addlog("re-challenging supressed\n"); 4227 } 4228 4229 x = splnet(); 4230 sp->pp_auth_failures = 0; 4231 /* indicate to LCP that we need to be closed down */ 4232 sp->lcp.protos |= (1 << IDX_CHAP); 4233 4234 if (sp->pp_flags & PP_NEEDAUTH) { 4235 /* 4236 * Remote is authenticator, but his auth proto didn't 4237 * complete yet. Defer the transition to network 4238 * phase. 4239 */ 4240 splx(x); 4241 return; 4242 } 4243 splx(x); 4244 4245 /* 4246 * If we are already in phase network, we are done here. This 4247 * is the case if this is a dummy tlu event after a re-challenge. 4248 */ 4249 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4250 sppp_phase_network(sp); 4251 } 4252 4253 static void 4254 sppp_chap_tld(struct sppp *sp) 4255 { 4256 STDDCL; 4257 4258 if (debug) 4259 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4260 callout_stop(&sp->ch[IDX_CHAP]); 4261 sp->lcp.protos &= ~(1 << IDX_CHAP); 4262 4263 lcp.Close(sp); 4264 } 4265 4266 static void 4267 sppp_chap_scr(struct sppp *sp) 4268 { 4269 uint32_t *ch; 4270 u_char clen = 4 * sizeof(uint32_t); 4271 4272 if (sp->myauth.name == NULL) { 4273 /* can't do anything useful */ 4274 printf("%s: chap starting without my name being set\n", 4275 sp->pp_if.if_xname); 4276 return; 4277 } 4278 4279 /* Compute random challenge. */ 4280 ch = (uint32_t *)sp->myauth.challenge; 4281 cprng_strong(kern_cprng, ch, clen, 0); 4282 4283 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4284 4285 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4286 sizeof clen, (const char *)&clen, 4287 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4288 sp->myauth.name_len, 4289 sp->myauth.name, 4290 0); 4291 } 4292 4293 /* 4294 *--------------------------------------------------------------------------* 4295 * * 4296 * The PAP implementation. * 4297 * * 4298 *--------------------------------------------------------------------------* 4299 */ 4300 /* 4301 * For PAP, we need to keep a little state also if we are the peer, not the 4302 * authenticator. This is since we don't get a request to authenticate, but 4303 * have to repeatedly authenticate ourself until we got a response (or the 4304 * retry counter is expired). 4305 */ 4306 4307 /* 4308 * Handle incoming PAP packets. */ 4309 static void 4310 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4311 { 4312 STDDCL; 4313 struct lcp_header *h; 4314 int len, x; 4315 u_char mlen; 4316 char *name, *secret; 4317 int name_len, secret_len; 4318 4319 /* 4320 * Malicious input might leave this uninitialized, so 4321 * init to an impossible value. 4322 */ 4323 secret_len = -1; 4324 4325 len = m->m_pkthdr.len; 4326 if (len < 5) { 4327 if (debug) 4328 log(LOG_DEBUG, 4329 "%s: pap invalid packet length: %d bytes\n", 4330 ifp->if_xname, len); 4331 return; 4332 } 4333 h = mtod(m, struct lcp_header *); 4334 if (len > ntohs(h->len)) 4335 len = ntohs(h->len); 4336 switch (h->type) { 4337 /* PAP request is my authproto */ 4338 case PAP_REQ: 4339 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4340 /* can't do anything useful */ 4341 printf("%s: pap request without his name and his secret being set\n", 4342 ifp->if_xname); 4343 break; 4344 } 4345 name = 1 + (u_char *)(h + 1); 4346 name_len = name[-1]; 4347 secret = name + name_len + 1; 4348 if (name_len > len - 6 || 4349 (secret_len = secret[-1]) > len - 6 - name_len) { 4350 if (debug) { 4351 log(LOG_DEBUG, "%s: pap corrupted input " 4352 "<%s id=0x%x len=%d", 4353 ifp->if_xname, 4354 sppp_auth_type_name(PPP_PAP, h->type), 4355 h->ident, ntohs(h->len)); 4356 if (len > 4) 4357 sppp_print_bytes((u_char *)(h + 1), 4358 len - 4); 4359 addlog(">\n"); 4360 } 4361 break; 4362 } 4363 if (debug) { 4364 log(LOG_DEBUG, "%s: pap input(%s) " 4365 "<%s id=0x%x len=%d name=", 4366 ifp->if_xname, 4367 sppp_state_name(sp->state[IDX_PAP]), 4368 sppp_auth_type_name(PPP_PAP, h->type), 4369 h->ident, ntohs(h->len)); 4370 sppp_print_string((char *)name, name_len); 4371 addlog(" secret="); 4372 sppp_print_string((char *)secret, secret_len); 4373 addlog(">\n"); 4374 } 4375 if (name_len != sp->hisauth.name_len || 4376 secret_len != sp->hisauth.secret_len || 4377 memcmp(name, sp->hisauth.name, name_len) != 0 || 4378 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4379 /* action scn, tld */ 4380 sp->pp_auth_failures++; 4381 mlen = sizeof(FAILMSG) - 1; 4382 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4383 sizeof mlen, (const char *)&mlen, 4384 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4385 0); 4386 pap.tld(sp); 4387 break; 4388 } 4389 /* action sca, perhaps tlu */ 4390 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4391 sp->state[IDX_PAP] == STATE_OPENED) { 4392 mlen = sizeof(SUCCMSG) - 1; 4393 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4394 sizeof mlen, (const char *)&mlen, 4395 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4396 0); 4397 } 4398 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4399 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4400 pap.tlu(sp); 4401 } 4402 break; 4403 4404 /* ack and nak are his authproto */ 4405 case PAP_ACK: 4406 callout_stop(&sp->pap_my_to_ch); 4407 if (debug) { 4408 log(LOG_DEBUG, "%s: pap success", 4409 ifp->if_xname); 4410 name = 1 + (u_char *)(h + 1); 4411 name_len = name[-1]; 4412 if (len > 5 && name_len < len+4) { 4413 addlog(": "); 4414 sppp_print_string(name, name_len); 4415 } 4416 addlog("\n"); 4417 } 4418 x = splnet(); 4419 sp->pp_auth_failures = 0; 4420 sp->pp_flags &= ~PP_NEEDAUTH; 4421 if (sp->myauth.proto == PPP_PAP && 4422 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4423 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4424 /* 4425 * We are authenticator for PAP but didn't 4426 * complete yet. Leave it to tlu to proceed 4427 * to network phase. 4428 */ 4429 splx(x); 4430 break; 4431 } 4432 splx(x); 4433 sppp_phase_network(sp); 4434 break; 4435 4436 case PAP_NAK: 4437 callout_stop(&sp->pap_my_to_ch); 4438 sp->pp_auth_failures++; 4439 if (debug) { 4440 log(LOG_INFO, "%s: pap failure", 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 } else 4450 log(LOG_INFO, "%s: pap failure\n", 4451 ifp->if_xname); 4452 /* await LCP shutdown by authenticator */ 4453 break; 4454 4455 default: 4456 /* Unknown PAP packet type -- ignore. */ 4457 if (debug) { 4458 log(LOG_DEBUG, "%s: pap corrupted input " 4459 "<0x%x id=0x%x len=%d", 4460 ifp->if_xname, 4461 h->type, h->ident, ntohs(h->len)); 4462 if (len > 4) 4463 sppp_print_bytes((u_char *)(h + 1), len - 4); 4464 addlog(">\n"); 4465 } 4466 break; 4467 4468 } 4469 } 4470 4471 static void 4472 sppp_pap_init(struct sppp *sp) 4473 { 4474 /* PAP doesn't have STATE_INITIAL at all. */ 4475 sp->state[IDX_PAP] = STATE_CLOSED; 4476 sp->fail_counter[IDX_PAP] = 0; 4477 sp->pp_seq[IDX_PAP] = 0; 4478 sp->pp_rseq[IDX_PAP] = 0; 4479 callout_init(&sp->ch[IDX_PAP], 0); 4480 callout_init(&sp->pap_my_to_ch, 0); 4481 } 4482 4483 static void 4484 sppp_pap_open(struct sppp *sp) 4485 { 4486 if (sp->hisauth.proto == PPP_PAP && 4487 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4488 /* we are authenticator for PAP, start our timer */ 4489 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4490 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4491 } 4492 if (sp->myauth.proto == PPP_PAP) { 4493 /* we are peer, send a request, and start a timer */ 4494 pap.scr(sp); 4495 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4496 sppp_pap_my_TO, sp); 4497 } 4498 } 4499 4500 static void 4501 sppp_pap_close(struct sppp *sp) 4502 { 4503 if (sp->state[IDX_PAP] != STATE_CLOSED) 4504 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4505 } 4506 4507 /* 4508 * That's the timeout routine if we are authenticator. Since the 4509 * authenticator is basically passive in PAP, we can't do much here. 4510 */ 4511 static void 4512 sppp_pap_TO(void *cookie) 4513 { 4514 struct sppp *sp = (struct sppp *)cookie; 4515 STDDCL; 4516 int s; 4517 4518 s = splnet(); 4519 if (debug) 4520 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4521 ifp->if_xname, 4522 sppp_state_name(sp->state[IDX_PAP]), 4523 sp->rst_counter[IDX_PAP]); 4524 4525 if (--sp->rst_counter[IDX_PAP] < 0) 4526 /* TO- event */ 4527 switch (sp->state[IDX_PAP]) { 4528 case STATE_REQ_SENT: 4529 pap.tld(sp); 4530 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4531 break; 4532 } 4533 else 4534 /* TO+ event, not very much we could do */ 4535 switch (sp->state[IDX_PAP]) { 4536 case STATE_REQ_SENT: 4537 /* sppp_cp_change_state() will restart the timer */ 4538 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4539 break; 4540 } 4541 4542 splx(s); 4543 } 4544 4545 /* 4546 * That's the timeout handler if we are peer. Since the peer is active, 4547 * we need to retransmit our PAP request since it is apparently lost. 4548 * XXX We should impose a max counter. 4549 */ 4550 static void 4551 sppp_pap_my_TO(void *cookie) 4552 { 4553 struct sppp *sp = (struct sppp *)cookie; 4554 STDDCL; 4555 4556 if (debug) 4557 log(LOG_DEBUG, "%s: pap peer TO\n", 4558 ifp->if_xname); 4559 4560 pap.scr(sp); 4561 } 4562 4563 static void 4564 sppp_pap_tlu(struct sppp *sp) 4565 { 4566 STDDCL; 4567 int x; 4568 4569 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4570 4571 if (debug) 4572 log(LOG_DEBUG, "%s: %s tlu\n", 4573 ifp->if_xname, pap.name); 4574 4575 x = splnet(); 4576 sp->pp_auth_failures = 0; 4577 /* indicate to LCP that we need to be closed down */ 4578 sp->lcp.protos |= (1 << IDX_PAP); 4579 4580 if (sp->pp_flags & PP_NEEDAUTH) { 4581 /* 4582 * Remote is authenticator, but his auth proto didn't 4583 * complete yet. Defer the transition to network 4584 * phase. 4585 */ 4586 splx(x); 4587 return; 4588 } 4589 splx(x); 4590 sppp_phase_network(sp); 4591 } 4592 4593 static void 4594 sppp_pap_tld(struct sppp *sp) 4595 { 4596 STDDCL; 4597 4598 if (debug) 4599 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4600 callout_stop(&sp->ch[IDX_PAP]); 4601 callout_stop(&sp->pap_my_to_ch); 4602 sp->lcp.protos &= ~(1 << IDX_PAP); 4603 4604 lcp.Close(sp); 4605 } 4606 4607 static void 4608 sppp_pap_scr(struct sppp *sp) 4609 { 4610 u_char idlen, pwdlen; 4611 4612 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4613 /* can't do anything useful */ 4614 printf("%s: pap starting without my name and secret being set\n", 4615 sp->pp_if.if_xname); 4616 return; 4617 } 4618 4619 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4620 pwdlen = sp->myauth.secret_len; 4621 idlen = sp->myauth.name_len; 4622 4623 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4624 sizeof idlen, (const char *)&idlen, 4625 idlen, sp->myauth.name, 4626 sizeof pwdlen, (const char *)&pwdlen, 4627 pwdlen, sp->myauth.secret, 4628 0); 4629 } 4630 4631 /* 4632 * Random miscellaneous functions. 4633 */ 4634 4635 /* 4636 * Send a PAP or CHAP proto packet. 4637 * 4638 * Varadic function, each of the elements for the ellipsis is of type 4639 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4640 * mlen == 0. 4641 * NOTE: never declare variadic functions with types subject to type 4642 * promotion (i.e. u_char). This is asking for big trouble depending 4643 * on the architecture you are on... 4644 */ 4645 4646 static void 4647 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4648 unsigned int type, unsigned int id, 4649 ...) 4650 { 4651 STDDCL; 4652 struct lcp_header *lh; 4653 struct mbuf *m; 4654 u_char *p; 4655 int len; 4656 size_t pkthdrlen; 4657 unsigned int mlen; 4658 const char *msg; 4659 va_list ap; 4660 4661 MGETHDR(m, M_DONTWAIT, MT_DATA); 4662 if (! m) 4663 return; 4664 m->m_pkthdr.rcvif = 0; 4665 4666 if (sp->pp_flags & PP_NOFRAMING) { 4667 *mtod(m, uint16_t *) = htons(cp->proto); 4668 pkthdrlen = 2; 4669 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4670 } else { 4671 struct ppp_header *h; 4672 h = mtod(m, struct ppp_header *); 4673 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4674 h->control = PPP_UI; /* Unnumbered Info */ 4675 h->protocol = htons(cp->proto); 4676 pkthdrlen = PPP_HEADER_LEN; 4677 4678 lh = (struct lcp_header *)(h + 1); 4679 } 4680 4681 lh->type = type; 4682 lh->ident = id; 4683 p = (u_char *)(lh + 1); 4684 4685 va_start(ap, id); 4686 len = 0; 4687 4688 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4689 msg = va_arg(ap, const char *); 4690 len += mlen; 4691 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4692 va_end(ap); 4693 m_freem(m); 4694 return; 4695 } 4696 4697 memcpy(p, msg, mlen); 4698 p += mlen; 4699 } 4700 va_end(ap); 4701 4702 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4703 lh->len = htons(LCP_HEADER_LEN + len); 4704 4705 if (debug) { 4706 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4707 ifp->if_xname, cp->name, 4708 sppp_auth_type_name(cp->proto, lh->type), 4709 lh->ident, ntohs(lh->len)); 4710 if (len) 4711 sppp_print_bytes((u_char *)(lh + 1), len); 4712 addlog(">\n"); 4713 } 4714 if (IF_QFULL(&sp->pp_cpq)) { 4715 IF_DROP(&sp->pp_fastq); 4716 IF_DROP(&ifp->if_snd); 4717 m_freem(m); 4718 ++ifp->if_oerrors; 4719 return; 4720 } else 4721 IF_ENQUEUE(&sp->pp_cpq, m); 4722 if (! (ifp->if_flags & IFF_OACTIVE)) 4723 (*ifp->if_start)(ifp); 4724 ifp->if_obytes += m->m_pkthdr.len + 3; 4725 } 4726 4727 /* 4728 * Send keepalive packets, every 10 seconds. 4729 */ 4730 static void 4731 sppp_keepalive(void *dummy) 4732 { 4733 struct sppp *sp; 4734 int s; 4735 time_t now; 4736 4737 s = splnet(); 4738 now = time_uptime; 4739 for (sp=spppq; sp; sp=sp->pp_next) { 4740 struct ifnet *ifp = &sp->pp_if; 4741 4742 /* check idle timeout */ 4743 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4744 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4745 /* idle timeout is enabled for this interface */ 4746 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4747 if (ifp->if_flags & IFF_DEBUG) 4748 printf("%s: no activity for %lu seconds\n", 4749 sp->pp_if.if_xname, 4750 (unsigned long)(now-sp->pp_last_activity)); 4751 lcp.Close(sp); 4752 continue; 4753 } 4754 } 4755 4756 /* Keepalive mode disabled or channel down? */ 4757 if (! (sp->pp_flags & PP_KEEPALIVE) || 4758 ! (ifp->if_flags & IFF_RUNNING)) 4759 continue; 4760 4761 /* No keepalive in PPP mode if LCP not opened yet. */ 4762 if (! (sp->pp_flags & PP_CISCO) && 4763 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4764 continue; 4765 4766 /* No echo reply, but maybe user data passed through? */ 4767 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4768 sp->pp_alivecnt = 0; 4769 continue; 4770 } 4771 4772 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4773 /* No keepalive packets got. Stop the interface. */ 4774 if_down (ifp); 4775 IF_PURGE(&sp->pp_cpq); 4776 if (! (sp->pp_flags & PP_CISCO)) { 4777 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4778 ifp->if_xname); 4779 sp->pp_alivecnt = 0; 4780 4781 /* we are down, close all open protocols */ 4782 lcp.Close(sp); 4783 4784 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4785 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4786 4787 /* Close connection immediately, completition of this 4788 * will summon the magic needed to reestablish it. */ 4789 if (sp->pp_tlf) 4790 sp->pp_tlf(sp); 4791 continue; 4792 } 4793 } 4794 if (sp->pp_alivecnt < sp->pp_maxalive) 4795 ++sp->pp_alivecnt; 4796 if (sp->pp_flags & PP_CISCO) 4797 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4798 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4799 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4800 int32_t nmagic = htonl(sp->lcp.magic); 4801 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4802 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4803 sp->lcp.echoid, 4, &nmagic); 4804 } 4805 } 4806 splx(s); 4807 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4808 } 4809 4810 #ifdef INET 4811 /* 4812 * Get both IP addresses. 4813 */ 4814 static void 4815 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4816 { 4817 struct ifnet *ifp = &sp->pp_if; 4818 struct ifaddr *ifa; 4819 struct sockaddr_in *si, *sm; 4820 uint32_t ssrc, ddst; 4821 4822 sm = NULL; 4823 ssrc = ddst = 0; 4824 /* 4825 * Pick the first AF_INET address from the list, 4826 * aliases don't make any sense on a p2p link anyway. 4827 */ 4828 si = 0; 4829 IFADDR_FOREACH(ifa, ifp) { 4830 if (ifa->ifa_addr->sa_family == AF_INET) { 4831 si = (struct sockaddr_in *)ifa->ifa_addr; 4832 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4833 if (si) 4834 break; 4835 } 4836 } 4837 if (ifa) { 4838 if (si && si->sin_addr.s_addr) { 4839 ssrc = si->sin_addr.s_addr; 4840 if (srcmask) 4841 *srcmask = ntohl(sm->sin_addr.s_addr); 4842 } 4843 4844 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4845 if (si && si->sin_addr.s_addr) 4846 ddst = si->sin_addr.s_addr; 4847 } 4848 4849 if (dst) *dst = ntohl(ddst); 4850 if (src) *src = ntohl(ssrc); 4851 } 4852 4853 /* 4854 * Set IP addresses. Must be called at splnet. 4855 * If an address is 0, leave it the way it is. 4856 */ 4857 static void 4858 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4859 { 4860 STDDCL; 4861 struct ifaddr *ifa; 4862 struct sockaddr_in *si, *dest; 4863 4864 /* 4865 * Pick the first AF_INET address from the list, 4866 * aliases don't make any sense on a p2p link anyway. 4867 */ 4868 4869 IFADDR_FOREACH(ifa, ifp) { 4870 if (ifa->ifa_addr->sa_family == AF_INET) { 4871 si = (struct sockaddr_in *)ifa->ifa_addr; 4872 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4873 goto found; 4874 } 4875 } 4876 return; 4877 4878 found: 4879 { 4880 int error; 4881 struct sockaddr_in new_sin = *si; 4882 struct sockaddr_in new_dst = *dest; 4883 4884 /* 4885 * Scrub old routes now instead of calling in_ifinit with 4886 * scrub=1, because we may change the dstaddr 4887 * before the call to in_ifinit. 4888 */ 4889 in_ifscrub(ifp, ifatoia(ifa)); 4890 4891 if (myaddr != 0) 4892 new_sin.sin_addr.s_addr = htonl(myaddr); 4893 if (hisaddr != 0) { 4894 new_dst.sin_addr.s_addr = htonl(hisaddr); 4895 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4896 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4897 *dest = new_dst; /* fix dstaddr in place */ 4898 } 4899 } 4900 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4901 if (debug && error) 4902 { 4903 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4904 " failed, error=%d\n", ifp->if_xname, error); 4905 } 4906 if (!error) { 4907 (void)pfil_run_hooks(if_pfil, 4908 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4909 } 4910 } 4911 } 4912 4913 /* 4914 * Clear IP addresses. Must be called at splnet. 4915 */ 4916 static void 4917 sppp_clear_ip_addrs(struct sppp *sp) 4918 { 4919 struct ifnet *ifp = &sp->pp_if; 4920 struct ifaddr *ifa; 4921 struct sockaddr_in *si, *dest; 4922 4923 uint32_t remote; 4924 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4925 remote = sp->ipcp.saved_hisaddr; 4926 else 4927 sppp_get_ip_addrs(sp, 0, &remote, 0); 4928 4929 /* 4930 * Pick the first AF_INET address from the list, 4931 * aliases don't make any sense on a p2p link anyway. 4932 */ 4933 4934 IFADDR_FOREACH(ifa, ifp) { 4935 if (ifa->ifa_addr->sa_family == AF_INET) { 4936 si = (struct sockaddr_in *)ifa->ifa_addr; 4937 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4938 goto found; 4939 } 4940 } 4941 return; 4942 4943 found: 4944 { 4945 struct sockaddr_in new_sin = *si; 4946 4947 in_ifscrub(ifp, ifatoia(ifa)); 4948 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4949 new_sin.sin_addr.s_addr = 0; 4950 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4951 /* replace peer addr in place */ 4952 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4953 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4954 (void)pfil_run_hooks(if_pfil, 4955 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4956 } 4957 } 4958 #endif 4959 4960 #ifdef INET6 4961 /* 4962 * Get both IPv6 addresses. 4963 */ 4964 static void 4965 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4966 struct in6_addr *srcmask) 4967 { 4968 struct ifnet *ifp = &sp->pp_if; 4969 struct ifaddr *ifa; 4970 struct sockaddr_in6 *si, *sm; 4971 struct in6_addr ssrc, ddst; 4972 4973 sm = NULL; 4974 memset(&ssrc, 0, sizeof(ssrc)); 4975 memset(&ddst, 0, sizeof(ddst)); 4976 /* 4977 * Pick the first link-local AF_INET6 address from the list, 4978 * aliases don't make any sense on a p2p link anyway. 4979 */ 4980 si = 0; 4981 IFADDR_FOREACH(ifa, ifp) 4982 if (ifa->ifa_addr->sa_family == AF_INET6) { 4983 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4984 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4985 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4986 break; 4987 } 4988 if (ifa) { 4989 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4990 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4991 if (srcmask) { 4992 memcpy(srcmask, &sm->sin6_addr, 4993 sizeof(*srcmask)); 4994 } 4995 } 4996 4997 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4998 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4999 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5000 } 5001 5002 if (dst) 5003 memcpy(dst, &ddst, sizeof(*dst)); 5004 if (src) 5005 memcpy(src, &ssrc, sizeof(*src)); 5006 } 5007 5008 #ifdef IPV6CP_MYIFID_DYN 5009 /* 5010 * Generate random ifid. 5011 */ 5012 static void 5013 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5014 { 5015 /* TBD */ 5016 } 5017 5018 /* 5019 * Set my IPv6 address. Must be called at splnet. 5020 */ 5021 static void 5022 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5023 { 5024 STDDCL; 5025 struct ifaddr *ifa; 5026 struct sockaddr_in6 *sin6; 5027 5028 /* 5029 * Pick the first link-local AF_INET6 address from the list, 5030 * aliases don't make any sense on a p2p link anyway. 5031 */ 5032 5033 sin6 = NULL; 5034 IFADDR_FOREACH(ifa, ifp) 5035 { 5036 if (ifa->ifa_addr->sa_family == AF_INET6) 5037 { 5038 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5039 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5040 break; 5041 } 5042 } 5043 5044 if (ifa && sin6) 5045 { 5046 int error; 5047 struct sockaddr_in6 new_sin6 = *sin6; 5048 5049 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5050 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5051 if (debug && error) 5052 { 5053 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5054 " failed, error=%d\n", ifp->if_xname, error); 5055 } 5056 if (!error) { 5057 (void)pfil_run_hooks(if_pfil, 5058 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5059 } 5060 } 5061 } 5062 #endif 5063 5064 /* 5065 * Suggest a candidate address to be used by peer. 5066 */ 5067 static void 5068 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5069 { 5070 struct in6_addr myaddr; 5071 struct timeval tv; 5072 5073 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5074 5075 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5076 microtime(&tv); 5077 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5078 myaddr.s6_addr[14] ^= 0xff; 5079 myaddr.s6_addr[15] ^= 0xff; 5080 } else { 5081 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5082 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5083 } 5084 if (suggest) 5085 memcpy(suggest, &myaddr, sizeof(myaddr)); 5086 } 5087 #endif /*INET6*/ 5088 5089 /* 5090 * Process ioctl requests specific to the PPP interface. 5091 * Permissions have already been checked. 5092 */ 5093 static int 5094 sppp_params(struct sppp *sp, u_long cmd, void *data) 5095 { 5096 switch (cmd) { 5097 case SPPPGETAUTHCFG: 5098 { 5099 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5100 int error; 5101 size_t len; 5102 5103 cfg->myauthflags = sp->myauth.flags; 5104 cfg->hisauthflags = sp->hisauth.flags; 5105 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5106 cfg->hisauth = 0; 5107 if (sp->hisauth.proto) 5108 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5109 cfg->myauth = 0; 5110 if (sp->myauth.proto) 5111 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5112 if (cfg->myname_length == 0) { 5113 if (sp->myauth.name != NULL) 5114 cfg->myname_length = sp->myauth.name_len + 1; 5115 } else { 5116 if (sp->myauth.name == NULL) { 5117 cfg->myname_length = 0; 5118 } else { 5119 len = sp->myauth.name_len + 1; 5120 if (cfg->myname_length < len) 5121 return (ENAMETOOLONG); 5122 error = copyout(sp->myauth.name, cfg->myname, len); 5123 if (error) return error; 5124 } 5125 } 5126 if (cfg->hisname_length == 0) { 5127 if (sp->hisauth.name != NULL) 5128 cfg->hisname_length = sp->hisauth.name_len + 1; 5129 } else { 5130 if (sp->hisauth.name == NULL) { 5131 cfg->hisname_length = 0; 5132 } else { 5133 len = sp->hisauth.name_len + 1; 5134 if (cfg->hisname_length < len) 5135 return (ENAMETOOLONG); 5136 error = copyout(sp->hisauth.name, cfg->hisname, len); 5137 if (error) return error; 5138 } 5139 } 5140 } 5141 break; 5142 case SPPPSETAUTHCFG: 5143 { 5144 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5145 int error; 5146 5147 if (sp->myauth.name) { 5148 free(sp->myauth.name, M_DEVBUF); 5149 sp->myauth.name = NULL; 5150 } 5151 if (sp->myauth.secret) { 5152 free(sp->myauth.secret, M_DEVBUF); 5153 sp->myauth.secret = NULL; 5154 } 5155 if (sp->hisauth.name) { 5156 free(sp->hisauth.name, M_DEVBUF); 5157 sp->hisauth.name = NULL; 5158 } 5159 if (sp->hisauth.secret) { 5160 free(sp->hisauth.secret, M_DEVBUF); 5161 sp->hisauth.secret = NULL; 5162 } 5163 5164 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5165 if (cfg->hisname_length >= MCLBYTES) 5166 return (ENAMETOOLONG); 5167 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5168 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5169 if (error) { 5170 free(sp->hisauth.name, M_DEVBUF); 5171 sp->hisauth.name = NULL; 5172 return error; 5173 } 5174 sp->hisauth.name_len = cfg->hisname_length - 1; 5175 sp->hisauth.name[sp->hisauth.name_len] = 0; 5176 } 5177 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5178 if (cfg->hissecret_length >= MCLBYTES) 5179 return (ENAMETOOLONG); 5180 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5181 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5182 if (error) { 5183 free(sp->hisauth.secret, M_DEVBUF); 5184 sp->hisauth.secret = NULL; 5185 return error; 5186 } 5187 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5188 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5189 } 5190 if (cfg->myname != NULL && cfg->myname_length > 0) { 5191 if (cfg->myname_length >= MCLBYTES) 5192 return (ENAMETOOLONG); 5193 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5194 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5195 if (error) { 5196 free(sp->myauth.name, M_DEVBUF); 5197 sp->myauth.name = NULL; 5198 return error; 5199 } 5200 sp->myauth.name_len = cfg->myname_length - 1; 5201 sp->myauth.name[sp->myauth.name_len] = 0; 5202 } 5203 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5204 if (cfg->mysecret_length >= MCLBYTES) 5205 return (ENAMETOOLONG); 5206 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5207 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5208 if (error) { 5209 free(sp->myauth.secret, M_DEVBUF); 5210 sp->myauth.secret = NULL; 5211 return error; 5212 } 5213 sp->myauth.secret_len = cfg->mysecret_length - 1; 5214 sp->myauth.secret[sp->myauth.secret_len] = 0; 5215 } 5216 sp->myauth.flags = cfg->myauthflags; 5217 if (cfg->myauth) 5218 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5219 sp->hisauth.flags = cfg->hisauthflags; 5220 if (cfg->hisauth) 5221 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5222 sp->pp_auth_failures = 0; 5223 if (sp->hisauth.proto != 0) 5224 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5225 else 5226 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5227 } 5228 break; 5229 case SPPPGETLCPCFG: 5230 { 5231 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5232 lcpp->lcp_timeout = sp->lcp.timeout; 5233 } 5234 break; 5235 case SPPPSETLCPCFG: 5236 { 5237 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5238 sp->lcp.timeout = lcpp->lcp_timeout; 5239 } 5240 break; 5241 case SPPPGETSTATUS: 5242 { 5243 struct spppstatus *status = (struct spppstatus *)data; 5244 status->phase = sp->pp_phase; 5245 } 5246 break; 5247 case SPPPGETSTATUSNCP: 5248 { 5249 struct spppstatusncp *status = (struct spppstatusncp *)data; 5250 status->phase = sp->pp_phase; 5251 status->ncpup = sppp_ncp_check(sp); 5252 } 5253 break; 5254 case SPPPGETIDLETO: 5255 { 5256 struct spppidletimeout *to = (struct spppidletimeout *)data; 5257 to->idle_seconds = sp->pp_idle_timeout; 5258 } 5259 break; 5260 case SPPPSETIDLETO: 5261 { 5262 struct spppidletimeout *to = (struct spppidletimeout *)data; 5263 sp->pp_idle_timeout = to->idle_seconds; 5264 } 5265 break; 5266 case SPPPSETAUTHFAILURE: 5267 { 5268 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5269 sp->pp_max_auth_fail = afsettings->max_failures; 5270 sp->pp_auth_failures = 0; 5271 } 5272 break; 5273 case SPPPGETAUTHFAILURES: 5274 { 5275 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5276 stats->auth_failures = sp->pp_auth_failures; 5277 stats->max_failures = sp->pp_max_auth_fail; 5278 } 5279 break; 5280 case SPPPSETDNSOPTS: 5281 { 5282 struct spppdnssettings *req = (struct spppdnssettings *)data; 5283 sp->query_dns = req->query_dns & 3; 5284 } 5285 break; 5286 case SPPPGETDNSOPTS: 5287 { 5288 struct spppdnssettings *req = (struct spppdnssettings *)data; 5289 req->query_dns = sp->query_dns; 5290 } 5291 break; 5292 case SPPPGETDNSADDRS: 5293 { 5294 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5295 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5296 } 5297 break; 5298 case SPPPGETKEEPALIVE: 5299 { 5300 struct spppkeepalivesettings *settings = 5301 (struct spppkeepalivesettings*)data; 5302 settings->maxalive = sp->pp_maxalive; 5303 settings->max_noreceive = sp->pp_max_noreceive; 5304 } 5305 break; 5306 case SPPPSETKEEPALIVE: 5307 { 5308 struct spppkeepalivesettings *settings = 5309 (struct spppkeepalivesettings*)data; 5310 sp->pp_maxalive = settings->maxalive; 5311 sp->pp_max_noreceive = settings->max_noreceive; 5312 } 5313 break; 5314 #if defined(COMPAT_50) || defined(MODULAR) 5315 case __SPPPGETIDLETO50: 5316 { 5317 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5318 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5319 } 5320 break; 5321 case __SPPPSETIDLETO50: 5322 { 5323 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5324 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5325 } 5326 break; 5327 case __SPPPGETKEEPALIVE50: 5328 { 5329 struct spppkeepalivesettings50 *settings = 5330 (struct spppkeepalivesettings50*)data; 5331 settings->maxalive = sp->pp_maxalive; 5332 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5333 } 5334 break; 5335 case __SPPPSETKEEPALIVE50: 5336 { 5337 struct spppkeepalivesettings50 *settings = 5338 (struct spppkeepalivesettings50*)data; 5339 sp->pp_maxalive = settings->maxalive; 5340 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5341 } 5342 break; 5343 #endif /* COMPAT_50 || MODULAR */ 5344 default: 5345 return (EINVAL); 5346 } 5347 5348 return (0); 5349 } 5350 5351 static void 5352 sppp_phase_network(struct sppp *sp) 5353 { 5354 STDDCL; 5355 int i; 5356 uint32_t mask; 5357 5358 sp->pp_phase = SPPP_PHASE_NETWORK; 5359 5360 if (debug) 5361 { 5362 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5363 sppp_phase_name(sp->pp_phase)); 5364 } 5365 5366 /* Notify NCPs now. */ 5367 for (i = 0; i < IDX_COUNT; i++) 5368 if ((cps[i])->flags & CP_NCP) 5369 (cps[i])->Open(sp); 5370 5371 /* Send Up events to all NCPs. */ 5372 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5373 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5374 (cps[i])->Up(sp); 5375 5376 /* if no NCP is starting, all this was in vain, close down */ 5377 sppp_lcp_check_and_close(sp); 5378 } 5379 5380 5381 static const char * 5382 sppp_cp_type_name(u_char type) 5383 { 5384 static char buf[12]; 5385 switch (type) { 5386 case CONF_REQ: return "conf-req"; 5387 case CONF_ACK: return "conf-ack"; 5388 case CONF_NAK: return "conf-nak"; 5389 case CONF_REJ: return "conf-rej"; 5390 case TERM_REQ: return "term-req"; 5391 case TERM_ACK: return "term-ack"; 5392 case CODE_REJ: return "code-rej"; 5393 case PROTO_REJ: return "proto-rej"; 5394 case ECHO_REQ: return "echo-req"; 5395 case ECHO_REPLY: return "echo-reply"; 5396 case DISC_REQ: return "discard-req"; 5397 } 5398 snprintf(buf, sizeof(buf), "0x%x", type); 5399 return buf; 5400 } 5401 5402 static const char * 5403 sppp_auth_type_name(u_short proto, u_char type) 5404 { 5405 static char buf[12]; 5406 switch (proto) { 5407 case PPP_CHAP: 5408 switch (type) { 5409 case CHAP_CHALLENGE: return "challenge"; 5410 case CHAP_RESPONSE: return "response"; 5411 case CHAP_SUCCESS: return "success"; 5412 case CHAP_FAILURE: return "failure"; 5413 } 5414 case PPP_PAP: 5415 switch (type) { 5416 case PAP_REQ: return "req"; 5417 case PAP_ACK: return "ack"; 5418 case PAP_NAK: return "nak"; 5419 } 5420 } 5421 snprintf(buf, sizeof(buf), "0x%x", type); 5422 return buf; 5423 } 5424 5425 static const char * 5426 sppp_lcp_opt_name(u_char opt) 5427 { 5428 static char buf[12]; 5429 switch (opt) { 5430 case LCP_OPT_MRU: return "mru"; 5431 case LCP_OPT_ASYNC_MAP: return "async-map"; 5432 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5433 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5434 case LCP_OPT_MAGIC: return "magic"; 5435 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5436 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5437 } 5438 snprintf(buf, sizeof(buf), "0x%x", opt); 5439 return buf; 5440 } 5441 5442 static const char * 5443 sppp_ipcp_opt_name(u_char opt) 5444 { 5445 static char buf[12]; 5446 switch (opt) { 5447 case IPCP_OPT_ADDRESSES: return "addresses"; 5448 case IPCP_OPT_COMPRESSION: return "compression"; 5449 case IPCP_OPT_ADDRESS: return "address"; 5450 } 5451 snprintf(buf, sizeof(buf), "0x%x", opt); 5452 return buf; 5453 } 5454 5455 #ifdef INET6 5456 static const char * 5457 sppp_ipv6cp_opt_name(u_char opt) 5458 { 5459 static char buf[12]; 5460 switch (opt) { 5461 case IPV6CP_OPT_IFID: return "ifid"; 5462 case IPV6CP_OPT_COMPRESSION: return "compression"; 5463 } 5464 snprintf(buf, sizeof(buf), "0x%x", opt); 5465 return buf; 5466 } 5467 #endif 5468 5469 static const char * 5470 sppp_state_name(int state) 5471 { 5472 switch (state) { 5473 case STATE_INITIAL: return "initial"; 5474 case STATE_STARTING: return "starting"; 5475 case STATE_CLOSED: return "closed"; 5476 case STATE_STOPPED: return "stopped"; 5477 case STATE_CLOSING: return "closing"; 5478 case STATE_STOPPING: return "stopping"; 5479 case STATE_REQ_SENT: return "req-sent"; 5480 case STATE_ACK_RCVD: return "ack-rcvd"; 5481 case STATE_ACK_SENT: return "ack-sent"; 5482 case STATE_OPENED: return "opened"; 5483 } 5484 return "illegal"; 5485 } 5486 5487 static const char * 5488 sppp_phase_name(int phase) 5489 { 5490 switch (phase) { 5491 case SPPP_PHASE_DEAD: return "dead"; 5492 case SPPP_PHASE_ESTABLISH: return "establish"; 5493 case SPPP_PHASE_TERMINATE: return "terminate"; 5494 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5495 case SPPP_PHASE_NETWORK: return "network"; 5496 } 5497 return "illegal"; 5498 } 5499 5500 static const char * 5501 sppp_proto_name(u_short proto) 5502 { 5503 static char buf[12]; 5504 switch (proto) { 5505 case PPP_LCP: return "lcp"; 5506 case PPP_IPCP: return "ipcp"; 5507 case PPP_PAP: return "pap"; 5508 case PPP_CHAP: return "chap"; 5509 case PPP_IPV6CP: return "ipv6cp"; 5510 } 5511 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5512 return buf; 5513 } 5514 5515 static void 5516 sppp_print_bytes(const u_char *p, u_short len) 5517 { 5518 addlog(" %02x", *p++); 5519 while (--len > 0) 5520 addlog("-%02x", *p++); 5521 } 5522 5523 static void 5524 sppp_print_string(const char *p, u_short len) 5525 { 5526 u_char c; 5527 5528 while (len-- > 0) { 5529 c = *p++; 5530 /* 5531 * Print only ASCII chars directly. RFC 1994 recommends 5532 * using only them, but we don't rely on it. */ 5533 if (c < ' ' || c > '~') 5534 addlog("\\x%x", c); 5535 else 5536 addlog("%c", c); 5537 } 5538 } 5539 5540 static const char * 5541 sppp_dotted_quad(uint32_t addr) 5542 { 5543 static char s[16]; 5544 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5545 (int)((addr >> 24) & 0xff), 5546 (int)((addr >> 16) & 0xff), 5547 (int)((addr >> 8) & 0xff), 5548 (int)(addr & 0xff)); 5549 return s; 5550 } 5551 5552 /* a dummy, used to drop uninteresting events */ 5553 static void 5554 sppp_null(struct sppp *unused) 5555 { 5556 /* do just nothing */ 5557 } 5558 /* 5559 * This file is large. Tell emacs to highlight it nevertheless. 5560 * 5561 * Local Variables: 5562 * hilit-auto-highlight-maxout: 120000 5563 * End: 5564 */ 5565
Indexes created Wed Oct 15 16:09:53 GMT 2025