if_spppsubr.c revision 1.118
1 /* $NetBSD: if_spppsubr.c,v 1.118 2009/04/18 14:58:05 tsutsui 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 1.118 2009/04/18 14:58:05 tsutsui Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_pfil_hooks.h" 50 51 #include <sys/param.h> 52 #include <sys/proc.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/sockio.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/callout.h> 61 #include <sys/md5.h> 62 #include <sys/inttypes.h> 63 #include <sys/kauth.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/if_types.h> 68 #include <net/route.h> 69 #include <net/ppp_defs.h> 70 71 #include <machine/stdarg.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #ifdef INET 77 #include <netinet/ip.h> 78 #include <netinet/tcp.h> 79 #endif 80 #include <net/ethertypes.h> 81 82 #ifdef INET6 83 #include <netinet6/scope6_var.h> 84 #endif 85 86 #ifdef IPX 87 #include <netipx/ipx.h> 88 #include <netipx/ipx_if.h> 89 #endif 90 91 92 #ifdef ISO 93 #include <netiso/argo_debug.h> 94 #include <netiso/iso.h> 95 #include <netiso/iso_var.h> 96 #include <netiso/iso_snpac.h> 97 #endif 98 99 #include <net/if_sppp.h> 100 #include <net/if_spppvar.h> 101 102 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 103 #define LOOPALIVECNT 3 /* loopback detection tries */ 104 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 105 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 106 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define CONF_REQ 1 /* PPP configure request */ 133 #define CONF_ACK 2 /* PPP configure acknowledge */ 134 #define CONF_NAK 3 /* PPP configure negative ack */ 135 #define CONF_REJ 4 /* PPP configure reject */ 136 #define TERM_REQ 5 /* PPP terminate request */ 137 #define TERM_ACK 6 /* PPP terminate acknowledge */ 138 #define CODE_REJ 7 /* PPP code reject */ 139 #define PROTO_REJ 8 /* PPP protocol reject */ 140 #define ECHO_REQ 9 /* PPP echo request */ 141 #define ECHO_REPLY 10 /* PPP echo reply */ 142 #define DISC_REQ 11 /* PPP discard request */ 143 144 #define LCP_OPT_MRU 1 /* maximum receive unit */ 145 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 146 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 147 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 148 #define LCP_OPT_MAGIC 5 /* magic number */ 149 #define LCP_OPT_RESERVED 6 /* reserved */ 150 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 151 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 152 153 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 154 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 155 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 156 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 157 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 158 159 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 160 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 161 162 #define PAP_REQ 1 /* PAP name/password request */ 163 #define PAP_ACK 2 /* PAP acknowledge */ 164 #define PAP_NAK 3 /* PAP fail */ 165 166 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 167 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 168 #define CHAP_SUCCESS 3 /* CHAP response ok */ 169 #define CHAP_FAILURE 4 /* CHAP response failed */ 170 171 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 172 173 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 174 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 175 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 176 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 177 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 178 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 179 180 /* states are named and numbered according to RFC 1661 */ 181 #define STATE_INITIAL 0 182 #define STATE_STARTING 1 183 #define STATE_CLOSED 2 184 #define STATE_STOPPED 3 185 #define STATE_CLOSING 4 186 #define STATE_STOPPING 5 187 #define STATE_REQ_SENT 6 188 #define STATE_ACK_RCVD 7 189 #define STATE_ACK_SENT 8 190 #define STATE_OPENED 9 191 192 struct ppp_header { 193 uint8_t address; 194 uint8_t control; 195 uint16_t protocol; 196 } __packed; 197 #define PPP_HEADER_LEN sizeof (struct ppp_header) 198 199 struct lcp_header { 200 uint8_t type; 201 uint8_t ident; 202 uint16_t len; 203 } __packed; 204 #define LCP_HEADER_LEN sizeof (struct lcp_header) 205 206 struct cisco_packet { 207 uint32_t type; 208 uint32_t par1; 209 uint32_t par2; 210 uint16_t rel; 211 uint16_t time0; 212 uint16_t time1; 213 } __packed; 214 #define CISCO_PACKET_LEN 18 215 216 /* 217 * We follow the spelling and capitalization of RFC 1661 here, to make 218 * it easier comparing with the standard. Please refer to this RFC in 219 * case you can't make sense out of these abbreviation; it will also 220 * explain the semantics related to the various events and actions. 221 */ 222 struct cp { 223 u_short proto; /* PPP control protocol number */ 224 u_char protoidx; /* index into state table in struct sppp */ 225 u_char flags; 226 #define CP_LCP 0x01 /* this is the LCP */ 227 #define CP_AUTH 0x02 /* this is an authentication protocol */ 228 #define CP_NCP 0x04 /* this is a NCP */ 229 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 230 const char *name; /* name of this control protocol */ 231 /* event handlers */ 232 void (*Up)(struct sppp *sp); 233 void (*Down)(struct sppp *sp); 234 void (*Open)(struct sppp *sp); 235 void (*Close)(struct sppp *sp); 236 void (*TO)(void *sp); 237 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 239 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 240 /* actions */ 241 void (*tlu)(struct sppp *sp); 242 void (*tld)(struct sppp *sp); 243 void (*tls)(struct sppp *sp); 244 void (*tlf)(struct sppp *sp); 245 void (*scr)(struct sppp *sp); 246 }; 247 248 static struct sppp *spppq; 249 static callout_t keepalive_ch; 250 251 #ifdef INET 252 /* 253 * The following disgusting hack gets around the problem that IP TOS 254 * can't be set yet. We want to put "interactive" traffic on a high 255 * priority queue. To decide if traffic is interactive, we check that 256 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 257 * 258 * XXX is this really still necessary? - joerg - 259 */ 260 static u_short interactive_ports[8] = { 261 0, 513, 0, 0, 262 0, 21, 0, 23, 263 }; 264 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 265 #endif 266 267 /* almost every function needs these */ 268 #define STDDCL \ 269 struct ifnet *ifp = &sp->pp_if; \ 270 int debug = ifp->if_flags & IFF_DEBUG 271 272 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 273 const struct sockaddr *dst, struct rtentry *rt); 274 275 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 276 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 277 278 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 279 struct mbuf *m); 280 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 281 u_char ident, u_short len, void *data); 282 /* static void sppp_cp_timeout(void *arg); */ 283 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 284 int newstate); 285 static void sppp_auth_send(const struct cp *cp, 286 struct sppp *sp, unsigned int type, unsigned int id, 287 ...); 288 289 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 293 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 294 295 static void sppp_null(struct sppp *sp); 296 297 static void sppp_lcp_init(struct sppp *sp); 298 static void sppp_lcp_up(struct sppp *sp); 299 static void sppp_lcp_down(struct sppp *sp); 300 static void sppp_lcp_open(struct sppp *sp); 301 static void sppp_lcp_close(struct sppp *sp); 302 static void sppp_lcp_TO(void *sp); 303 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 306 static void sppp_lcp_tlu(struct sppp *sp); 307 static void sppp_lcp_tld(struct sppp *sp); 308 static void sppp_lcp_tls(struct sppp *sp); 309 static void sppp_lcp_tlf(struct sppp *sp); 310 static void sppp_lcp_scr(struct sppp *sp); 311 static void sppp_lcp_check_and_close(struct sppp *sp); 312 static int sppp_ncp_check(struct sppp *sp); 313 314 static void sppp_ipcp_init(struct sppp *sp); 315 static void sppp_ipcp_up(struct sppp *sp); 316 static void sppp_ipcp_down(struct sppp *sp); 317 static void sppp_ipcp_open(struct sppp *sp); 318 static void sppp_ipcp_close(struct sppp *sp); 319 static void sppp_ipcp_TO(void *sp); 320 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipcp_tlu(struct sppp *sp); 324 static void sppp_ipcp_tld(struct sppp *sp); 325 static void sppp_ipcp_tls(struct sppp *sp); 326 static void sppp_ipcp_tlf(struct sppp *sp); 327 static void sppp_ipcp_scr(struct sppp *sp); 328 329 static void sppp_ipv6cp_init(struct sppp *sp); 330 static void sppp_ipv6cp_up(struct sppp *sp); 331 static void sppp_ipv6cp_down(struct sppp *sp); 332 static void sppp_ipv6cp_open(struct sppp *sp); 333 static void sppp_ipv6cp_close(struct sppp *sp); 334 static void sppp_ipv6cp_TO(void *sp); 335 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 338 static void sppp_ipv6cp_tlu(struct sppp *sp); 339 static void sppp_ipv6cp_tld(struct sppp *sp); 340 static void sppp_ipv6cp_tls(struct sppp *sp); 341 static void sppp_ipv6cp_tlf(struct sppp *sp); 342 static void sppp_ipv6cp_scr(struct sppp *sp); 343 344 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_pap_init(struct sppp *sp); 346 static void sppp_pap_open(struct sppp *sp); 347 static void sppp_pap_close(struct sppp *sp); 348 static void sppp_pap_TO(void *sp); 349 static void sppp_pap_my_TO(void *sp); 350 static void sppp_pap_tlu(struct sppp *sp); 351 static void sppp_pap_tld(struct sppp *sp); 352 static void sppp_pap_scr(struct sppp *sp); 353 354 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 355 static void sppp_chap_init(struct sppp *sp); 356 static void sppp_chap_open(struct sppp *sp); 357 static void sppp_chap_close(struct sppp *sp); 358 static void sppp_chap_TO(void *sp); 359 static void sppp_chap_tlu(struct sppp *sp); 360 static void sppp_chap_tld(struct sppp *sp); 361 static void sppp_chap_scr(struct sppp *sp); 362 363 static const char *sppp_auth_type_name(u_short proto, u_char type); 364 static const char *sppp_cp_type_name(u_char type); 365 static const char *sppp_dotted_quad(uint32_t addr); 366 static const char *sppp_ipcp_opt_name(u_char opt); 367 #ifdef INET6 368 static const char *sppp_ipv6cp_opt_name(u_char opt); 369 #endif 370 static const char *sppp_lcp_opt_name(u_char opt); 371 static const char *sppp_phase_name(int phase); 372 static const char *sppp_proto_name(u_short proto); 373 static const char *sppp_state_name(int state); 374 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 375 #ifdef INET 376 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 377 uint32_t *srcmask); 378 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #endif 381 static void sppp_keepalive(void *dummy); 382 static void sppp_phase_network(struct sppp *sp); 383 static void sppp_print_bytes(const u_char *p, u_short len); 384 static void sppp_print_string(const char *p, u_short len); 385 #ifdef INET6 386 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 387 struct in6_addr *dst, struct in6_addr *srcmask); 388 #ifdef IPV6CP_MYIFID_DYN 389 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 390 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 391 #endif 392 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 393 #endif 394 395 /* our control protocol descriptors */ 396 static const struct cp lcp = { 397 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 398 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 399 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 400 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 401 sppp_lcp_scr 402 }; 403 404 static const struct cp ipcp = { 405 PPP_IPCP, IDX_IPCP, 406 #ifdef INET 407 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 408 #else 409 0, 410 #endif 411 "ipcp", 412 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 413 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 414 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 415 sppp_ipcp_scr 416 }; 417 418 static const struct cp ipv6cp = { 419 PPP_IPV6CP, IDX_IPV6CP, 420 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 421 CP_NCP, 422 #else 423 0, 424 #endif 425 "ipv6cp", 426 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 427 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 428 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 429 sppp_ipv6cp_scr 430 }; 431 432 static const struct cp pap = { 433 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 434 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 435 sppp_pap_TO, 0, 0, 0, 436 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 437 sppp_pap_scr 438 }; 439 440 static const struct cp chap = { 441 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 442 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 443 sppp_chap_TO, 0, 0, 0, 444 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 445 sppp_chap_scr 446 }; 447 448 static const struct cp *cps[IDX_COUNT] = { 449 &lcp, /* IDX_LCP */ 450 &ipcp, /* IDX_IPCP */ 451 &ipv6cp, /* IDX_IPV6CP */ 452 &pap, /* IDX_PAP */ 453 &chap, /* IDX_CHAP */ 454 }; 455 456 457 void spppattach(int); 458 void 459 /*ARGSUSED*/ 460 spppattach(int count) 461 { 462 } 463 464 /* 465 * Exported functions, comprising our interface to the lower layer. 466 */ 467 468 /* 469 * Process the received packet. 470 */ 471 void 472 sppp_input(struct ifnet *ifp, struct mbuf *m) 473 { 474 struct ppp_header *h = NULL; 475 struct ifqueue *inq = 0; 476 uint16_t protocol; 477 int s; 478 struct sppp *sp = (struct sppp *)ifp; 479 int debug = ifp->if_flags & IFF_DEBUG; 480 481 if (ifp->if_flags & IFF_UP) { 482 /* Count received bytes, add hardware framing */ 483 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 484 /* Note time of last receive */ 485 sp->pp_last_receive = time_uptime; 486 } 487 488 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 489 /* Too small packet, drop it. */ 490 if (debug) 491 log(LOG_DEBUG, 492 "%s: input packet is too small, %d bytes\n", 493 ifp->if_xname, m->m_pkthdr.len); 494 drop: 495 ++ifp->if_ierrors; 496 ++ifp->if_iqdrops; 497 m_freem(m); 498 return; 499 } 500 501 if (sp->pp_flags & PP_NOFRAMING) { 502 memcpy(&protocol, mtod(m, void *), 2); 503 protocol = ntohs(protocol); 504 m_adj(m, 2); 505 } else { 506 507 /* Get PPP header. */ 508 h = mtod(m, struct ppp_header *); 509 m_adj(m, PPP_HEADER_LEN); 510 511 switch (h->address) { 512 case PPP_ALLSTATIONS: 513 if (h->control != PPP_UI) 514 goto invalid; 515 if (sp->pp_flags & PP_CISCO) { 516 if (debug) 517 log(LOG_DEBUG, 518 "%s: PPP packet in Cisco mode " 519 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 520 ifp->if_xname, 521 h->address, h->control, ntohs(h->protocol)); 522 goto drop; 523 } 524 break; 525 case CISCO_MULTICAST: 526 case CISCO_UNICAST: 527 /* Don't check the control field here (RFC 1547). */ 528 if (! (sp->pp_flags & PP_CISCO)) { 529 if (debug) 530 log(LOG_DEBUG, 531 "%s: Cisco packet in PPP mode " 532 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 533 ifp->if_xname, 534 h->address, h->control, ntohs(h->protocol)); 535 goto drop; 536 } 537 switch (ntohs(h->protocol)) { 538 default: 539 ++ifp->if_noproto; 540 goto invalid; 541 case CISCO_KEEPALIVE: 542 sppp_cisco_input((struct sppp *) ifp, m); 543 m_freem(m); 544 return; 545 #ifdef INET 546 case ETHERTYPE_IP: 547 schednetisr(NETISR_IP); 548 inq = &ipintrq; 549 break; 550 #endif 551 #ifdef INET6 552 case ETHERTYPE_IPV6: 553 schednetisr(NETISR_IPV6); 554 inq = &ip6intrq; 555 break; 556 #endif 557 #ifdef IPX 558 case ETHERTYPE_IPX: 559 schednetisr(NETISR_IPX); 560 inq = &ipxintrq; 561 break; 562 #endif 563 } 564 goto queue_pkt; 565 default: /* Invalid PPP packet. */ 566 invalid: 567 if (debug) 568 log(LOG_DEBUG, 569 "%s: invalid input packet " 570 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 571 ifp->if_xname, 572 h->address, h->control, ntohs(h->protocol)); 573 goto drop; 574 } 575 protocol = ntohs(h->protocol); 576 } 577 578 switch (protocol) { 579 default: 580 if (sp->state[IDX_LCP] == STATE_OPENED) { 581 uint16_t prot = htons(protocol); 582 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 583 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 584 &prot); 585 } 586 if (debug) 587 log(LOG_DEBUG, 588 "%s: invalid input protocol " 589 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 590 ++ifp->if_noproto; 591 goto drop; 592 case PPP_LCP: 593 sppp_cp_input(&lcp, sp, m); 594 m_freem(m); 595 return; 596 case PPP_PAP: 597 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 598 sppp_pap_input(sp, m); 599 m_freem(m); 600 return; 601 case PPP_CHAP: 602 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 603 sppp_chap_input(sp, m); 604 m_freem(m); 605 return; 606 #ifdef INET 607 case PPP_IPCP: 608 if (sp->pp_phase == SPPP_PHASE_NETWORK) 609 sppp_cp_input(&ipcp, sp, m); 610 m_freem(m); 611 return; 612 case PPP_IP: 613 if (sp->state[IDX_IPCP] == STATE_OPENED) { 614 schednetisr(NETISR_IP); 615 inq = &ipintrq; 616 sp->pp_last_activity = time_uptime; 617 } 618 break; 619 #endif 620 #ifdef INET6 621 case PPP_IPV6CP: 622 if (sp->pp_phase == SPPP_PHASE_NETWORK) 623 sppp_cp_input(&ipv6cp, sp, m); 624 m_freem(m); 625 return; 626 627 case PPP_IPV6: 628 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 629 schednetisr(NETISR_IPV6); 630 inq = &ip6intrq; 631 sp->pp_last_activity = time_uptime; 632 } 633 break; 634 #endif 635 #ifdef IPX 636 case PPP_IPX: 637 /* IPX IPXCP not implemented yet */ 638 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 639 schednetisr(NETISR_IPX); 640 inq = &ipxintrq; 641 } 642 break; 643 #endif 644 #ifdef ISO 645 case PPP_ISO: 646 /* OSI NLCP not implemented yet */ 647 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 648 schednetisr(NETISR_ISO); 649 inq = &clnlintrq; 650 } 651 break; 652 #endif 653 } 654 655 queue_pkt: 656 if (! (ifp->if_flags & IFF_UP) || ! inq) 657 goto drop; 658 659 /* Check queue. */ 660 s = splnet(); 661 if (IF_QFULL(inq)) { 662 /* Queue overflow. */ 663 IF_DROP(inq); 664 splx(s); 665 if (debug) 666 log(LOG_DEBUG, "%s: protocol queue overflow\n", 667 ifp->if_xname); 668 goto drop; 669 } 670 IF_ENQUEUE(inq, m); 671 splx(s); 672 } 673 674 /* 675 * Enqueue transmit packet. 676 */ 677 static int 678 sppp_output(struct ifnet *ifp, struct mbuf *m, 679 const struct sockaddr *dst, struct rtentry *rt) 680 { 681 struct sppp *sp = (struct sppp *) ifp; 682 struct ppp_header *h = NULL; 683 struct ifqueue *ifq = NULL; /* XXX */ 684 int s, error = 0; 685 uint16_t protocol; 686 ALTQ_DECL(struct altq_pktattr pktattr;) 687 688 s = splnet(); 689 690 sp->pp_last_activity = time_uptime; 691 692 if ((ifp->if_flags & IFF_UP) == 0 || 693 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 694 m_freem(m); 695 splx(s); 696 return (ENETDOWN); 697 } 698 699 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 700 /* 701 * Interface is not yet running, but auto-dial. Need 702 * to start LCP for it. 703 */ 704 ifp->if_flags |= IFF_RUNNING; 705 splx(s); 706 lcp.Open(sp); 707 s = splnet(); 708 } 709 710 /* 711 * If the queueing discipline needs packet classification, 712 * do it before prepending link headers. 713 */ 714 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 715 716 #ifdef INET 717 if (dst->sa_family == AF_INET) { 718 struct ip *ip = NULL; 719 struct tcphdr *th = NULL; 720 721 if (m->m_len >= sizeof(struct ip)) { 722 ip = mtod(m, struct ip *); 723 if (ip->ip_p == IPPROTO_TCP && 724 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 725 sizeof(struct tcphdr)) { 726 th = (struct tcphdr *) 727 ((char *)ip + (ip->ip_hl << 2)); 728 } 729 } else 730 ip = NULL; 731 732 /* 733 * When using dynamic local IP address assignment by using 734 * 0.0.0.0 as a local address, the first TCP session will 735 * not connect because the local TCP checksum is computed 736 * using 0.0.0.0 which will later become our real IP address 737 * so the TCP checksum computed at the remote end will 738 * become invalid. So we 739 * - don't let packets with src ip addr 0 thru 740 * - we flag TCP packets with src ip 0 as an error 741 */ 742 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 743 uint8_t proto = ip->ip_p; 744 745 m_freem(m); 746 splx(s); 747 if (proto == IPPROTO_TCP) 748 return (EADDRNOTAVAIL); 749 else 750 return (0); 751 } 752 753 /* 754 * Put low delay, telnet, rlogin and ftp control packets 755 * in front of the queue. 756 */ 757 758 if (!IF_QFULL(&sp->pp_fastq) && 759 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 760 (th && (INTERACTIVE(ntohs(th->th_sport)) || 761 INTERACTIVE(ntohs(th->th_dport)))))) 762 ifq = &sp->pp_fastq; 763 } 764 #endif 765 766 #ifdef INET6 767 if (dst->sa_family == AF_INET6) { 768 /* XXX do something tricky here? */ 769 } 770 #endif 771 772 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 773 /* 774 * Prepend general data packet PPP header. For now, IP only. 775 */ 776 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 777 if (! m) { 778 if (ifp->if_flags & IFF_DEBUG) 779 log(LOG_DEBUG, "%s: no memory for transmit header\n", 780 ifp->if_xname); 781 ++ifp->if_oerrors; 782 splx(s); 783 return (ENOBUFS); 784 } 785 /* 786 * May want to check size of packet 787 * (albeit due to the implementation it's always enough) 788 */ 789 h = mtod(m, struct ppp_header *); 790 if (sp->pp_flags & PP_CISCO) { 791 h->address = CISCO_UNICAST; /* unicast address */ 792 h->control = 0; 793 } else { 794 h->address = PPP_ALLSTATIONS; /* broadcast address */ 795 h->control = PPP_UI; /* Unnumbered Info */ 796 } 797 } 798 799 switch (dst->sa_family) { 800 #ifdef INET 801 case AF_INET: /* Internet Protocol */ 802 if (sp->pp_flags & PP_CISCO) 803 protocol = htons(ETHERTYPE_IP); 804 else { 805 /* 806 * Don't choke with an ENETDOWN early. It's 807 * possible that we just started dialing out, 808 * so don't drop the packet immediately. If 809 * we notice that we run out of buffer space 810 * below, we will however remember that we are 811 * not ready to carry IP packets, and return 812 * ENETDOWN, as opposed to ENOBUFS. 813 */ 814 protocol = htons(PPP_IP); 815 if (sp->state[IDX_IPCP] != STATE_OPENED) 816 error = ENETDOWN; 817 } 818 break; 819 #endif 820 #ifdef INET6 821 case AF_INET6: /* Internet Protocol version 6 */ 822 if (sp->pp_flags & PP_CISCO) 823 protocol = htons(ETHERTYPE_IPV6); 824 else { 825 /* 826 * Don't choke with an ENETDOWN early. It's 827 * possible that we just started dialing out, 828 * so don't drop the packet immediately. If 829 * we notice that we run out of buffer space 830 * below, we will however remember that we are 831 * not ready to carry IP packets, and return 832 * ENETDOWN, as opposed to ENOBUFS. 833 */ 834 protocol = htons(PPP_IPV6); 835 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 836 error = ENETDOWN; 837 } 838 break; 839 #endif 840 #ifdef IPX 841 case AF_IPX: /* Novell IPX Protocol */ 842 protocol = htons((sp->pp_flags & PP_CISCO) ? 843 ETHERTYPE_IPX : PPP_IPX); 844 break; 845 #endif 846 #ifdef ISO 847 case AF_ISO: /* ISO OSI Protocol */ 848 if (sp->pp_flags & PP_CISCO) 849 goto nosupport; 850 protocol = htons(PPP_ISO); 851 break; 852 nosupport: 853 #endif 854 default: 855 m_freem(m); 856 ++ifp->if_oerrors; 857 splx(s); 858 return (EAFNOSUPPORT); 859 } 860 861 if (sp->pp_flags & PP_NOFRAMING) { 862 M_PREPEND(m, 2, M_DONTWAIT); 863 if (m == NULL) { 864 if (ifp->if_flags & IFF_DEBUG) 865 log(LOG_DEBUG, "%s: no memory for transmit header\n", 866 ifp->if_xname); 867 ++ifp->if_oerrors; 868 splx(s); 869 return (ENOBUFS); 870 } 871 *mtod(m, uint16_t *) = protocol; 872 } else { 873 h->protocol = protocol; 874 } 875 876 877 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 878 879 if (error == 0) { 880 /* 881 * Count output packets and bytes. 882 * The packet length includes header + additional hardware 883 * framing according to RFC 1333. 884 */ 885 if (!(ifp->if_flags & IFF_OACTIVE)) 886 (*ifp->if_start)(ifp); 887 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 888 } 889 splx(s); 890 return error; 891 } 892 893 void 894 sppp_attach(struct ifnet *ifp) 895 { 896 struct sppp *sp = (struct sppp *) ifp; 897 898 /* Initialize keepalive handler. */ 899 if (! spppq) { 900 callout_init(&keepalive_ch, 0); 901 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 902 } 903 904 /* Insert new entry into the keepalive list. */ 905 sp->pp_next = spppq; 906 spppq = sp; 907 908 sp->pp_if.if_type = IFT_PPP; 909 sp->pp_if.if_output = sppp_output; 910 sp->pp_fastq.ifq_maxlen = 32; 911 sp->pp_cpq.ifq_maxlen = 20; 912 sp->pp_loopcnt = 0; 913 sp->pp_alivecnt = 0; 914 sp->pp_last_activity = 0; 915 sp->pp_last_receive = 0; 916 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 917 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 918 sp->pp_idle_timeout = 0; 919 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 920 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 921 sp->pp_auth_failures = 0; 922 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 923 sp->pp_phase = SPPP_PHASE_DEAD; 924 sp->pp_up = lcp.Up; 925 sp->pp_down = lcp.Down; 926 927 if_alloc_sadl(ifp); 928 929 memset(&sp->myauth, 0, sizeof sp->myauth); 930 memset(&sp->hisauth, 0, sizeof sp->hisauth); 931 sppp_lcp_init(sp); 932 sppp_ipcp_init(sp); 933 sppp_ipv6cp_init(sp); 934 sppp_pap_init(sp); 935 sppp_chap_init(sp); 936 } 937 938 void 939 sppp_detach(struct ifnet *ifp) 940 { 941 struct sppp **q, *p, *sp = (struct sppp *) ifp; 942 943 /* Remove the entry from the keepalive list. */ 944 for (q = &spppq; (p = *q); q = &p->pp_next) 945 if (p == sp) { 946 *q = p->pp_next; 947 break; 948 } 949 950 /* Stop keepalive handler. */ 951 if (! spppq) { 952 callout_stop(&keepalive_ch); 953 } 954 955 callout_stop(&sp->ch[IDX_LCP]); 956 callout_stop(&sp->ch[IDX_IPCP]); 957 callout_stop(&sp->ch[IDX_PAP]); 958 callout_stop(&sp->ch[IDX_CHAP]); 959 #ifdef INET6 960 callout_stop(&sp->ch[IDX_IPV6CP]); 961 #endif 962 callout_stop(&sp->pap_my_to_ch); 963 964 /* free authentication info */ 965 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 966 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 967 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 968 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 969 970 #if 0 /* done in if_detach() */ 971 if_free_sadl(ifp); 972 #endif 973 } 974 975 /* 976 * Flush the interface output queue. 977 */ 978 void 979 sppp_flush(struct ifnet *ifp) 980 { 981 struct sppp *sp = (struct sppp *) ifp; 982 983 IFQ_PURGE(&sp->pp_if.if_snd); 984 IF_PURGE(&sp->pp_fastq); 985 IF_PURGE(&sp->pp_cpq); 986 } 987 988 /* 989 * Check if the output queue is empty. 990 */ 991 int 992 sppp_isempty(struct ifnet *ifp) 993 { 994 struct sppp *sp = (struct sppp *) ifp; 995 int empty, s; 996 997 s = splnet(); 998 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 999 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1000 splx(s); 1001 return (empty); 1002 } 1003 1004 /* 1005 * Get next packet to send. 1006 */ 1007 struct mbuf * 1008 sppp_dequeue(struct ifnet *ifp) 1009 { 1010 struct sppp *sp = (struct sppp *) ifp; 1011 struct mbuf *m; 1012 int s; 1013 1014 s = splnet(); 1015 /* 1016 * Process only the control protocol queue until we have at 1017 * least one NCP open. 1018 * 1019 * Do always serve all three queues in Cisco mode. 1020 */ 1021 IF_DEQUEUE(&sp->pp_cpq, m); 1022 if (m == NULL && 1023 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1024 IF_DEQUEUE(&sp->pp_fastq, m); 1025 if (m == NULL) 1026 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1027 } 1028 splx(s); 1029 return m; 1030 } 1031 1032 /* 1033 * Process an ioctl request. Called on low priority level. 1034 */ 1035 int 1036 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1037 { 1038 struct lwp *l = curlwp; /* XXX */ 1039 struct ifreq *ifr = (struct ifreq *) data; 1040 struct sppp *sp = (struct sppp *) ifp; 1041 int s, error=0, going_up, going_down, newmode; 1042 1043 s = splnet(); 1044 switch (cmd) { 1045 case SIOCSIFDSTADDR: 1046 case SIOCINITIFADDR: 1047 break; 1048 1049 case SIOCSIFFLAGS: 1050 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1051 break; 1052 going_up = ifp->if_flags & IFF_UP && 1053 (ifp->if_flags & IFF_RUNNING) == 0; 1054 going_down = (ifp->if_flags & IFF_UP) == 0 && 1055 ifp->if_flags & IFF_RUNNING; 1056 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1057 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1058 /* sanity */ 1059 newmode = IFF_PASSIVE; 1060 ifp->if_flags &= ~IFF_AUTO; 1061 } 1062 1063 if (going_up || going_down) 1064 lcp.Close(sp); 1065 if (going_up && newmode == 0) { 1066 /* neither auto-dial nor passive */ 1067 ifp->if_flags |= IFF_RUNNING; 1068 if (!(sp->pp_flags & PP_CISCO)) 1069 lcp.Open(sp); 1070 } else if (going_down) { 1071 sppp_flush(ifp); 1072 ifp->if_flags &= ~IFF_RUNNING; 1073 } 1074 1075 break; 1076 1077 case SIOCSIFMTU: 1078 if (ifr->ifr_mtu < PPP_MINMRU || 1079 ifr->ifr_mtu > sp->lcp.their_mru) { 1080 error = EINVAL; 1081 break; 1082 } 1083 /*FALLTHROUGH*/ 1084 case SIOCGIFMTU: 1085 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1086 error = 0; 1087 break; 1088 case SIOCADDMULTI: 1089 case SIOCDELMULTI: 1090 break; 1091 1092 case SPPPSETAUTHCFG: 1093 case SPPPSETLCPCFG: 1094 case SPPPSETIDLETO: 1095 case SPPPSETAUTHFAILURE: 1096 case SPPPSETDNSOPTS: 1097 case SPPPSETKEEPALIVE: 1098 error = kauth_authorize_network(l->l_cred, 1099 KAUTH_NETWORK_INTERFACE, 1100 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1101 NULL); 1102 if (error) 1103 break; 1104 error = sppp_params(sp, cmd, data); 1105 break; 1106 1107 case SPPPGETAUTHCFG: 1108 case SPPPGETLCPCFG: 1109 case SPPPGETAUTHFAILURES: 1110 error = kauth_authorize_network(l->l_cred, 1111 KAUTH_NETWORK_INTERFACE, 1112 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1113 NULL); 1114 if (error) 1115 break; 1116 error = sppp_params(sp, cmd, data); 1117 break; 1118 1119 case SPPPGETSTATUS: 1120 case SPPPGETSTATUSNCP: 1121 case SPPPGETIDLETO: 1122 case SPPPGETDNSOPTS: 1123 case SPPPGETDNSADDRS: 1124 case SPPPGETKEEPALIVE: 1125 error = sppp_params(sp, cmd, data); 1126 break; 1127 1128 default: 1129 error = ifioctl_common(ifp, cmd, data); 1130 break; 1131 } 1132 splx(s); 1133 return (error); 1134 } 1135 1136 1137 /* 1138 * Cisco framing implementation. 1139 */ 1140 1141 /* 1142 * Handle incoming Cisco keepalive protocol packets. 1143 */ 1144 static void 1145 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1146 { 1147 STDDCL; 1148 struct cisco_packet *h; 1149 #ifdef INET 1150 uint32_t me, mymask = 0; /* XXX: GCC */ 1151 #endif 1152 1153 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1154 if (debug) 1155 log(LOG_DEBUG, 1156 "%s: cisco invalid packet length: %d bytes\n", 1157 ifp->if_xname, m->m_pkthdr.len); 1158 return; 1159 } 1160 h = mtod(m, struct cisco_packet *); 1161 if (debug) 1162 log(LOG_DEBUG, 1163 "%s: cisco input: %d bytes " 1164 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1165 ifp->if_xname, m->m_pkthdr.len, 1166 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1167 (u_int)h->time0, (u_int)h->time1); 1168 switch (ntohl(h->type)) { 1169 default: 1170 if (debug) 1171 addlog("%s: cisco unknown packet type: 0x%x\n", 1172 ifp->if_xname, ntohl(h->type)); 1173 break; 1174 case CISCO_ADDR_REPLY: 1175 /* Reply on address request, ignore */ 1176 break; 1177 case CISCO_KEEPALIVE_REQ: 1178 sp->pp_alivecnt = 0; 1179 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1180 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1181 /* Local and remote sequence numbers are equal. 1182 * Probably, the line is in loopback mode. */ 1183 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1184 printf ("%s: loopback\n", 1185 ifp->if_xname); 1186 sp->pp_loopcnt = 0; 1187 if (ifp->if_flags & IFF_UP) { 1188 if_down(ifp); 1189 IF_PURGE(&sp->pp_cpq); 1190 } 1191 } 1192 ++sp->pp_loopcnt; 1193 1194 /* Generate new local sequence number */ 1195 sp->pp_seq[IDX_LCP] = arc4random(); 1196 break; 1197 } 1198 sp->pp_loopcnt = 0; 1199 if (! (ifp->if_flags & IFF_UP) && 1200 (ifp->if_flags & IFF_RUNNING)) { 1201 if_up(ifp); 1202 } 1203 break; 1204 case CISCO_ADDR_REQ: 1205 #ifdef INET 1206 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1207 if (me != 0L) 1208 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1209 #endif 1210 break; 1211 } 1212 } 1213 1214 /* 1215 * Send Cisco keepalive packet. 1216 */ 1217 static void 1218 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1219 { 1220 STDDCL; 1221 struct ppp_header *h; 1222 struct cisco_packet *ch; 1223 struct mbuf *m; 1224 uint32_t t; 1225 1226 t = time_uptime * 1000; 1227 MGETHDR(m, M_DONTWAIT, MT_DATA); 1228 if (! m) 1229 return; 1230 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1231 m->m_pkthdr.rcvif = 0; 1232 1233 h = mtod(m, struct ppp_header *); 1234 h->address = CISCO_MULTICAST; 1235 h->control = 0; 1236 h->protocol = htons(CISCO_KEEPALIVE); 1237 1238 ch = (struct cisco_packet *)(h + 1); 1239 ch->type = htonl(type); 1240 ch->par1 = htonl(par1); 1241 ch->par2 = htonl(par2); 1242 ch->rel = -1; 1243 1244 ch->time0 = htons((u_short)(t >> 16)); 1245 ch->time1 = htons((u_short) t); 1246 1247 if (debug) 1248 log(LOG_DEBUG, 1249 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1250 ifp->if_xname, ntohl(ch->type), ch->par1, 1251 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1252 (u_int)ch->time1); 1253 1254 if (IF_QFULL(&sp->pp_cpq)) { 1255 IF_DROP(&sp->pp_fastq); 1256 IF_DROP(&ifp->if_snd); 1257 m_freem(m); 1258 ++ifp->if_oerrors; 1259 return; 1260 } else 1261 IF_ENQUEUE(&sp->pp_cpq, m); 1262 if (! (ifp->if_flags & IFF_OACTIVE)) 1263 (*ifp->if_start)(ifp); 1264 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1265 } 1266 1267 /* 1268 * PPP protocol implementation. 1269 */ 1270 1271 /* 1272 * Send PPP control protocol packet. 1273 */ 1274 static void 1275 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1276 u_char ident, u_short len, void *data) 1277 { 1278 STDDCL; 1279 struct lcp_header *lh; 1280 struct mbuf *m; 1281 size_t pkthdrlen; 1282 1283 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1284 1285 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1286 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1287 MGETHDR(m, M_DONTWAIT, MT_DATA); 1288 if (! m) 1289 return; 1290 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1291 m->m_pkthdr.rcvif = 0; 1292 1293 if (sp->pp_flags & PP_NOFRAMING) { 1294 *mtod(m, uint16_t *) = htons(proto); 1295 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1296 } else { 1297 struct ppp_header *h; 1298 h = mtod(m, struct ppp_header *); 1299 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1300 h->control = PPP_UI; /* Unnumbered Info */ 1301 h->protocol = htons(proto); /* Link Control Protocol */ 1302 lh = (struct lcp_header *)(h + 1); 1303 } 1304 lh->type = type; 1305 lh->ident = ident; 1306 lh->len = htons(LCP_HEADER_LEN + len); 1307 if (len) 1308 bcopy (data, lh + 1, len); 1309 1310 if (debug) { 1311 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1312 ifp->if_xname, 1313 sppp_proto_name(proto), 1314 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1315 if (len) 1316 sppp_print_bytes((u_char *)(lh + 1), len); 1317 addlog(">\n"); 1318 } 1319 if (IF_QFULL(&sp->pp_cpq)) { 1320 IF_DROP(&sp->pp_fastq); 1321 IF_DROP(&ifp->if_snd); 1322 m_freem(m); 1323 ++ifp->if_oerrors; 1324 return; 1325 } else 1326 IF_ENQUEUE(&sp->pp_cpq, m); 1327 if (! (ifp->if_flags & IFF_OACTIVE)) 1328 (*ifp->if_start)(ifp); 1329 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1330 } 1331 1332 /* 1333 * Handle incoming PPP control protocol packets. 1334 */ 1335 static void 1336 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1337 { 1338 STDDCL; 1339 struct lcp_header *h; 1340 int printlen, len = m->m_pkthdr.len; 1341 int rv; 1342 u_char *p; 1343 uint32_t u32; 1344 1345 if (len < 4) { 1346 if (debug) 1347 log(LOG_DEBUG, 1348 "%s: %s invalid packet length: %d bytes\n", 1349 ifp->if_xname, cp->name, len); 1350 return; 1351 } 1352 h = mtod(m, struct lcp_header *); 1353 if (debug) { 1354 printlen = ntohs(h->len); 1355 log(LOG_DEBUG, 1356 "%s: %s input(%s): <%s id=0x%x len=%d", 1357 ifp->if_xname, cp->name, 1358 sppp_state_name(sp->state[cp->protoidx]), 1359 sppp_cp_type_name(h->type), h->ident, printlen); 1360 if (len < printlen) 1361 printlen = len; 1362 if (printlen > 4) 1363 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1364 addlog(">\n"); 1365 } 1366 if (len > ntohs(h->len)) 1367 len = ntohs(h->len); 1368 p = (u_char *)(h + 1); 1369 switch (h->type) { 1370 case CONF_REQ: 1371 if (len < 4) { 1372 if (debug) 1373 addlog("%s: %s invalid conf-req length %d\n", 1374 ifp->if_xname, cp->name, 1375 len); 1376 ++ifp->if_ierrors; 1377 break; 1378 } 1379 /* handle states where RCR doesn't get a SCA/SCN */ 1380 switch (sp->state[cp->protoidx]) { 1381 case STATE_CLOSING: 1382 case STATE_STOPPING: 1383 return; 1384 case STATE_CLOSED: 1385 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1386 0, 0); 1387 return; 1388 } 1389 rv = (cp->RCR)(sp, h, len); 1390 if (rv < 0) { 1391 /* fatal error, shut down */ 1392 (cp->tld)(sp); 1393 sppp_lcp_tlf(sp); 1394 return; 1395 } 1396 switch (sp->state[cp->protoidx]) { 1397 case STATE_OPENED: 1398 (cp->tld)(sp); 1399 (cp->scr)(sp); 1400 /* fall through... */ 1401 case STATE_ACK_SENT: 1402 case STATE_REQ_SENT: 1403 sppp_cp_change_state(cp, sp, rv? 1404 STATE_ACK_SENT: STATE_REQ_SENT); 1405 break; 1406 case STATE_STOPPED: 1407 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1408 (cp->scr)(sp); 1409 sppp_cp_change_state(cp, sp, rv? 1410 STATE_ACK_SENT: STATE_REQ_SENT); 1411 break; 1412 case STATE_ACK_RCVD: 1413 if (rv) { 1414 sppp_cp_change_state(cp, sp, STATE_OPENED); 1415 if (debug) 1416 log(LOG_DEBUG, "%s: %s tlu\n", 1417 ifp->if_xname, 1418 cp->name); 1419 (cp->tlu)(sp); 1420 } else 1421 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1422 break; 1423 default: 1424 printf("%s: %s illegal %s in state %s\n", 1425 ifp->if_xname, cp->name, 1426 sppp_cp_type_name(h->type), 1427 sppp_state_name(sp->state[cp->protoidx])); 1428 ++ifp->if_ierrors; 1429 } 1430 break; 1431 case CONF_ACK: 1432 if (h->ident != sp->confid[cp->protoidx]) { 1433 if (debug) 1434 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1435 ifp->if_xname, cp->name, 1436 h->ident, sp->confid[cp->protoidx]); 1437 ++ifp->if_ierrors; 1438 break; 1439 } 1440 switch (sp->state[cp->protoidx]) { 1441 case STATE_CLOSED: 1442 case STATE_STOPPED: 1443 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1444 break; 1445 case STATE_CLOSING: 1446 case STATE_STOPPING: 1447 break; 1448 case STATE_REQ_SENT: 1449 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1450 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1451 break; 1452 case STATE_OPENED: 1453 (cp->tld)(sp); 1454 /* fall through */ 1455 case STATE_ACK_RCVD: 1456 (cp->scr)(sp); 1457 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1458 break; 1459 case STATE_ACK_SENT: 1460 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1461 sppp_cp_change_state(cp, sp, STATE_OPENED); 1462 if (debug) 1463 log(LOG_DEBUG, "%s: %s tlu\n", 1464 ifp->if_xname, cp->name); 1465 (cp->tlu)(sp); 1466 break; 1467 default: 1468 printf("%s: %s illegal %s in state %s\n", 1469 ifp->if_xname, cp->name, 1470 sppp_cp_type_name(h->type), 1471 sppp_state_name(sp->state[cp->protoidx])); 1472 ++ifp->if_ierrors; 1473 } 1474 break; 1475 case CONF_NAK: 1476 case CONF_REJ: 1477 if (h->ident != sp->confid[cp->protoidx]) { 1478 if (debug) 1479 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1480 ifp->if_xname, cp->name, 1481 h->ident, sp->confid[cp->protoidx]); 1482 ++ifp->if_ierrors; 1483 break; 1484 } 1485 if (h->type == CONF_NAK) 1486 (cp->RCN_nak)(sp, h, len); 1487 else /* CONF_REJ */ 1488 (cp->RCN_rej)(sp, h, len); 1489 1490 switch (sp->state[cp->protoidx]) { 1491 case STATE_CLOSED: 1492 case STATE_STOPPED: 1493 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1494 break; 1495 case STATE_REQ_SENT: 1496 case STATE_ACK_SENT: 1497 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1498 (cp->scr)(sp); 1499 break; 1500 case STATE_OPENED: 1501 (cp->tld)(sp); 1502 /* fall through */ 1503 case STATE_ACK_RCVD: 1504 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1505 (cp->scr)(sp); 1506 break; 1507 case STATE_CLOSING: 1508 case STATE_STOPPING: 1509 break; 1510 default: 1511 printf("%s: %s illegal %s in state %s\n", 1512 ifp->if_xname, cp->name, 1513 sppp_cp_type_name(h->type), 1514 sppp_state_name(sp->state[cp->protoidx])); 1515 ++ifp->if_ierrors; 1516 } 1517 break; 1518 1519 case TERM_REQ: 1520 switch (sp->state[cp->protoidx]) { 1521 case STATE_ACK_RCVD: 1522 case STATE_ACK_SENT: 1523 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1524 /* fall through */ 1525 case STATE_CLOSED: 1526 case STATE_STOPPED: 1527 case STATE_CLOSING: 1528 case STATE_STOPPING: 1529 case STATE_REQ_SENT: 1530 sta: 1531 /* Send Terminate-Ack packet. */ 1532 if (debug) 1533 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1534 ifp->if_xname, cp->name); 1535 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1536 break; 1537 case STATE_OPENED: 1538 (cp->tld)(sp); 1539 sp->rst_counter[cp->protoidx] = 0; 1540 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1541 goto sta; 1542 default: 1543 printf("%s: %s illegal %s in state %s\n", 1544 ifp->if_xname, cp->name, 1545 sppp_cp_type_name(h->type), 1546 sppp_state_name(sp->state[cp->protoidx])); 1547 ++ifp->if_ierrors; 1548 } 1549 break; 1550 case TERM_ACK: 1551 switch (sp->state[cp->protoidx]) { 1552 case STATE_CLOSED: 1553 case STATE_STOPPED: 1554 case STATE_REQ_SENT: 1555 case STATE_ACK_SENT: 1556 break; 1557 case STATE_CLOSING: 1558 (cp->tlf)(sp); 1559 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1560 sppp_lcp_check_and_close(sp); 1561 break; 1562 case STATE_STOPPING: 1563 (cp->tlf)(sp); 1564 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1565 sppp_lcp_check_and_close(sp); 1566 break; 1567 case STATE_ACK_RCVD: 1568 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1569 break; 1570 case STATE_OPENED: 1571 (cp->tld)(sp); 1572 (cp->scr)(sp); 1573 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1574 break; 1575 default: 1576 printf("%s: %s illegal %s in state %s\n", 1577 ifp->if_xname, cp->name, 1578 sppp_cp_type_name(h->type), 1579 sppp_state_name(sp->state[cp->protoidx])); 1580 ++ifp->if_ierrors; 1581 } 1582 break; 1583 case CODE_REJ: 1584 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1585 log(LOG_INFO, 1586 "%s: %s: ignoring RXJ (%s) for code ?, " 1587 "danger will robinson\n", 1588 ifp->if_xname, cp->name, 1589 sppp_cp_type_name(h->type)); 1590 switch (sp->state[cp->protoidx]) { 1591 case STATE_CLOSED: 1592 case STATE_STOPPED: 1593 case STATE_REQ_SENT: 1594 case STATE_ACK_SENT: 1595 case STATE_CLOSING: 1596 case STATE_STOPPING: 1597 case STATE_OPENED: 1598 break; 1599 case STATE_ACK_RCVD: 1600 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1601 break; 1602 default: 1603 printf("%s: %s illegal %s in state %s\n", 1604 ifp->if_xname, cp->name, 1605 sppp_cp_type_name(h->type), 1606 sppp_state_name(sp->state[cp->protoidx])); 1607 ++ifp->if_ierrors; 1608 } 1609 break; 1610 case PROTO_REJ: 1611 { 1612 int catastrophic; 1613 const struct cp *upper; 1614 int i; 1615 uint16_t proto; 1616 1617 catastrophic = 0; 1618 upper = NULL; 1619 proto = p[0] << 8 | p[1]; 1620 for (i = 0; i < IDX_COUNT; i++) { 1621 if (cps[i]->proto == proto) { 1622 upper = cps[i]; 1623 break; 1624 } 1625 } 1626 if (upper == NULL) 1627 catastrophic++; 1628 1629 if (debug) 1630 log(LOG_INFO, 1631 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1632 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1633 sppp_cp_type_name(h->type), proto, 1634 upper ? upper->name : "unknown", 1635 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1636 1637 /* 1638 * if we got RXJ+ against conf-req, the peer does not implement 1639 * this particular protocol type. terminate the protocol. 1640 */ 1641 if (upper && !catastrophic) { 1642 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1643 upper->Close(sp); 1644 break; 1645 } 1646 } 1647 1648 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1649 switch (sp->state[cp->protoidx]) { 1650 case STATE_CLOSED: 1651 case STATE_STOPPED: 1652 case STATE_REQ_SENT: 1653 case STATE_ACK_SENT: 1654 case STATE_CLOSING: 1655 case STATE_STOPPING: 1656 case STATE_OPENED: 1657 break; 1658 case STATE_ACK_RCVD: 1659 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1660 break; 1661 default: 1662 printf("%s: %s illegal %s in state %s\n", 1663 ifp->if_xname, cp->name, 1664 sppp_cp_type_name(h->type), 1665 sppp_state_name(sp->state[cp->protoidx])); 1666 ++ifp->if_ierrors; 1667 } 1668 break; 1669 } 1670 case DISC_REQ: 1671 if (cp->proto != PPP_LCP) 1672 goto illegal; 1673 /* Discard the packet. */ 1674 break; 1675 case ECHO_REQ: 1676 if (cp->proto != PPP_LCP) 1677 goto illegal; 1678 if (sp->state[cp->protoidx] != STATE_OPENED) { 1679 if (debug) 1680 addlog("%s: lcp echo req but lcp closed\n", 1681 ifp->if_xname); 1682 ++ifp->if_ierrors; 1683 break; 1684 } 1685 if (len < 8) { 1686 if (debug) 1687 addlog("%s: invalid lcp echo request " 1688 "packet length: %d bytes\n", 1689 ifp->if_xname, len); 1690 break; 1691 } 1692 memcpy(&u32, h + 1, sizeof u32); 1693 if (ntohl(u32) == sp->lcp.magic) { 1694 /* Line loopback mode detected. */ 1695 printf("%s: loopback\n", ifp->if_xname); 1696 if_down(ifp); 1697 IF_PURGE(&sp->pp_cpq); 1698 1699 /* Shut down the PPP link. */ 1700 /* XXX */ 1701 lcp.Down(sp); 1702 lcp.Up(sp); 1703 break; 1704 } 1705 u32 = htonl(sp->lcp.magic); 1706 memcpy(h + 1, &u32, sizeof u32); 1707 if (debug) 1708 addlog("%s: got lcp echo req, sending echo rep\n", 1709 ifp->if_xname); 1710 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1711 h + 1); 1712 break; 1713 case ECHO_REPLY: 1714 if (cp->proto != PPP_LCP) 1715 goto illegal; 1716 if (h->ident != sp->lcp.echoid) { 1717 ++ifp->if_ierrors; 1718 break; 1719 } 1720 if (len < 8) { 1721 if (debug) 1722 addlog("%s: lcp invalid echo reply " 1723 "packet length: %d bytes\n", 1724 ifp->if_xname, len); 1725 break; 1726 } 1727 if (debug) 1728 addlog("%s: lcp got echo rep\n", 1729 ifp->if_xname); 1730 memcpy(&u32, h + 1, sizeof u32); 1731 if (ntohl(u32) != sp->lcp.magic) 1732 sp->pp_alivecnt = 0; 1733 break; 1734 default: 1735 /* Unknown packet type -- send Code-Reject packet. */ 1736 illegal: 1737 if (debug) 1738 addlog("%s: %s send code-rej for 0x%x\n", 1739 ifp->if_xname, cp->name, h->type); 1740 sppp_cp_send(sp, cp->proto, CODE_REJ, 1741 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1742 ++ifp->if_ierrors; 1743 } 1744 } 1745 1746 1747 /* 1748 * The generic part of all Up/Down/Open/Close/TO event handlers. 1749 * Basically, the state transition handling in the automaton. 1750 */ 1751 static void 1752 sppp_up_event(const struct cp *cp, struct sppp *sp) 1753 { 1754 STDDCL; 1755 1756 if (debug) 1757 log(LOG_DEBUG, "%s: %s up(%s)\n", 1758 ifp->if_xname, cp->name, 1759 sppp_state_name(sp->state[cp->protoidx])); 1760 1761 switch (sp->state[cp->protoidx]) { 1762 case STATE_INITIAL: 1763 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1764 break; 1765 case STATE_STARTING: 1766 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1767 (cp->scr)(sp); 1768 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1769 break; 1770 default: 1771 printf("%s: %s illegal up in state %s\n", 1772 ifp->if_xname, cp->name, 1773 sppp_state_name(sp->state[cp->protoidx])); 1774 } 1775 } 1776 1777 static void 1778 sppp_down_event(const struct cp *cp, struct sppp *sp) 1779 { 1780 STDDCL; 1781 1782 if (debug) 1783 log(LOG_DEBUG, "%s: %s down(%s)\n", 1784 ifp->if_xname, cp->name, 1785 sppp_state_name(sp->state[cp->protoidx])); 1786 1787 switch (sp->state[cp->protoidx]) { 1788 case STATE_CLOSED: 1789 case STATE_CLOSING: 1790 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1791 break; 1792 case STATE_STOPPED: 1793 (cp->tls)(sp); 1794 /* fall through */ 1795 case STATE_STOPPING: 1796 case STATE_REQ_SENT: 1797 case STATE_ACK_RCVD: 1798 case STATE_ACK_SENT: 1799 sppp_cp_change_state(cp, sp, STATE_STARTING); 1800 break; 1801 case STATE_OPENED: 1802 (cp->tld)(sp); 1803 sppp_cp_change_state(cp, sp, STATE_STARTING); 1804 break; 1805 default: 1806 printf("%s: %s illegal down in state %s\n", 1807 ifp->if_xname, cp->name, 1808 sppp_state_name(sp->state[cp->protoidx])); 1809 } 1810 } 1811 1812 1813 static void 1814 sppp_open_event(const struct cp *cp, struct sppp *sp) 1815 { 1816 STDDCL; 1817 1818 if (debug) 1819 log(LOG_DEBUG, "%s: %s open(%s)\n", 1820 ifp->if_xname, cp->name, 1821 sppp_state_name(sp->state[cp->protoidx])); 1822 1823 switch (sp->state[cp->protoidx]) { 1824 case STATE_INITIAL: 1825 sppp_cp_change_state(cp, sp, STATE_STARTING); 1826 (cp->tls)(sp); 1827 break; 1828 case STATE_STARTING: 1829 break; 1830 case STATE_CLOSED: 1831 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1832 (cp->scr)(sp); 1833 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1834 break; 1835 case STATE_STOPPED: 1836 case STATE_STOPPING: 1837 case STATE_REQ_SENT: 1838 case STATE_ACK_RCVD: 1839 case STATE_ACK_SENT: 1840 case STATE_OPENED: 1841 break; 1842 case STATE_CLOSING: 1843 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1844 break; 1845 } 1846 } 1847 1848 1849 static void 1850 sppp_close_event(const struct cp *cp, struct sppp *sp) 1851 { 1852 STDDCL; 1853 1854 if (debug) 1855 log(LOG_DEBUG, "%s: %s close(%s)\n", 1856 ifp->if_xname, cp->name, 1857 sppp_state_name(sp->state[cp->protoidx])); 1858 1859 switch (sp->state[cp->protoidx]) { 1860 case STATE_INITIAL: 1861 case STATE_CLOSED: 1862 case STATE_CLOSING: 1863 break; 1864 case STATE_STARTING: 1865 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1866 (cp->tlf)(sp); 1867 break; 1868 case STATE_STOPPED: 1869 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1870 break; 1871 case STATE_STOPPING: 1872 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1873 break; 1874 case STATE_OPENED: 1875 (cp->tld)(sp); 1876 /* fall through */ 1877 case STATE_REQ_SENT: 1878 case STATE_ACK_RCVD: 1879 case STATE_ACK_SENT: 1880 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1881 sppp_cp_send(sp, cp->proto, TERM_REQ, 1882 ++sp->pp_seq[cp->protoidx], 0, 0); 1883 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1884 break; 1885 } 1886 } 1887 1888 static void 1889 sppp_to_event(const struct cp *cp, struct sppp *sp) 1890 { 1891 STDDCL; 1892 int s; 1893 1894 s = splnet(); 1895 if (debug) 1896 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1897 ifp->if_xname, cp->name, 1898 sppp_state_name(sp->state[cp->protoidx]), 1899 sp->rst_counter[cp->protoidx]); 1900 1901 if (--sp->rst_counter[cp->protoidx] < 0) 1902 /* TO- event */ 1903 switch (sp->state[cp->protoidx]) { 1904 case STATE_CLOSING: 1905 (cp->tlf)(sp); 1906 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1907 sppp_lcp_check_and_close(sp); 1908 break; 1909 case STATE_STOPPING: 1910 (cp->tlf)(sp); 1911 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1912 sppp_lcp_check_and_close(sp); 1913 break; 1914 case STATE_REQ_SENT: 1915 case STATE_ACK_RCVD: 1916 case STATE_ACK_SENT: 1917 (cp->tlf)(sp); 1918 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1919 sppp_lcp_check_and_close(sp); 1920 break; 1921 } 1922 else 1923 /* TO+ event */ 1924 switch (sp->state[cp->protoidx]) { 1925 case STATE_CLOSING: 1926 case STATE_STOPPING: 1927 sppp_cp_send(sp, cp->proto, TERM_REQ, 1928 ++sp->pp_seq[cp->protoidx], 0, 0); 1929 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1930 cp->TO, sp); 1931 break; 1932 case STATE_REQ_SENT: 1933 case STATE_ACK_RCVD: 1934 (cp->scr)(sp); 1935 /* sppp_cp_change_state() will restart the timer */ 1936 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1937 break; 1938 case STATE_ACK_SENT: 1939 (cp->scr)(sp); 1940 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1941 cp->TO, sp); 1942 break; 1943 } 1944 1945 splx(s); 1946 } 1947 1948 /* 1949 * Change the state of a control protocol in the state automaton. 1950 * Takes care of starting/stopping the restart timer. 1951 */ 1952 void 1953 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1954 { 1955 sp->state[cp->protoidx] = newstate; 1956 callout_stop(&sp->ch[cp->protoidx]); 1957 switch (newstate) { 1958 case STATE_INITIAL: 1959 case STATE_STARTING: 1960 case STATE_CLOSED: 1961 case STATE_STOPPED: 1962 case STATE_OPENED: 1963 break; 1964 case STATE_CLOSING: 1965 case STATE_STOPPING: 1966 case STATE_REQ_SENT: 1967 case STATE_ACK_RCVD: 1968 case STATE_ACK_SENT: 1969 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1970 cp->TO, sp); 1971 break; 1972 } 1973 } 1974 1975 /* 1976 *--------------------------------------------------------------------------* 1977 * * 1978 * The LCP implementation. * 1979 * * 1980 *--------------------------------------------------------------------------* 1981 */ 1982 static void 1983 sppp_lcp_init(struct sppp *sp) 1984 { 1985 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1986 sp->lcp.magic = 0; 1987 sp->state[IDX_LCP] = STATE_INITIAL; 1988 sp->fail_counter[IDX_LCP] = 0; 1989 sp->pp_seq[IDX_LCP] = 0; 1990 sp->pp_rseq[IDX_LCP] = 0; 1991 sp->lcp.protos = 0; 1992 if (sp->pp_if.if_mtu < PP_MTU) { 1993 sp->lcp.mru = sp->pp_if.if_mtu; 1994 sp->lcp.opts |= (1 << LCP_OPT_MRU); 1995 } else 1996 sp->lcp.mru = PP_MTU; 1997 sp->lcp.their_mru = PP_MTU; 1998 1999 /* 2000 * Initialize counters and timeout values. Note that we don't 2001 * use the 3 seconds suggested in RFC 1661 since we are likely 2002 * running on a fast link. XXX We should probably implement 2003 * the exponential backoff option. Note that these values are 2004 * relevant for all control protocols, not just LCP only. 2005 */ 2006 sp->lcp.timeout = 1 * hz; 2007 sp->lcp.max_terminate = 2; 2008 sp->lcp.max_configure = 10; 2009 sp->lcp.max_failure = 10; 2010 callout_init(&sp->ch[IDX_LCP], 0); 2011 } 2012 2013 static void 2014 sppp_lcp_up(struct sppp *sp) 2015 { 2016 STDDCL; 2017 2018 /* Initialize activity timestamp: opening a connection is an activity */ 2019 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2020 2021 /* 2022 * If this interface is passive or dial-on-demand, and we are 2023 * still in Initial state, it means we've got an incoming 2024 * call. Activate the interface. 2025 */ 2026 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2027 if (debug) 2028 log(LOG_DEBUG, 2029 "%s: Up event", ifp->if_xname); 2030 ifp->if_flags |= IFF_RUNNING; 2031 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2032 if (debug) 2033 addlog("(incoming call)\n"); 2034 sp->pp_flags |= PP_CALLIN; 2035 lcp.Open(sp); 2036 } else if (debug) 2037 addlog("\n"); 2038 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2039 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2040 ifp->if_flags |= IFF_RUNNING; 2041 lcp.Open(sp); 2042 } 2043 2044 sppp_up_event(&lcp, sp); 2045 } 2046 2047 static void 2048 sppp_lcp_down(struct sppp *sp) 2049 { 2050 STDDCL; 2051 2052 sppp_down_event(&lcp, sp); 2053 2054 /* 2055 * If this is neither a dial-on-demand nor a passive 2056 * interface, simulate an ``ifconfig down'' action, so the 2057 * administrator can force a redial by another ``ifconfig 2058 * up''. XXX For leased line operation, should we immediately 2059 * try to reopen the connection here? 2060 */ 2061 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2062 if (debug) 2063 log(LOG_INFO, 2064 "%s: Down event (carrier loss), taking interface down.\n", 2065 ifp->if_xname); 2066 if_down(ifp); 2067 } else { 2068 if (debug) 2069 log(LOG_DEBUG, 2070 "%s: Down event (carrier loss)\n", 2071 ifp->if_xname); 2072 } 2073 sp->pp_flags &= ~PP_CALLIN; 2074 if (sp->state[IDX_LCP] != STATE_INITIAL) 2075 lcp.Close(sp); 2076 ifp->if_flags &= ~IFF_RUNNING; 2077 } 2078 2079 static void 2080 sppp_lcp_open(struct sppp *sp) 2081 { 2082 /* 2083 * If we are authenticator, negotiate LCP_AUTH 2084 */ 2085 if (sp->hisauth.proto != 0) 2086 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2087 else 2088 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2089 sp->pp_flags &= ~PP_NEEDAUTH; 2090 sppp_open_event(&lcp, sp); 2091 } 2092 2093 static void 2094 sppp_lcp_close(struct sppp *sp) 2095 { 2096 sppp_close_event(&lcp, sp); 2097 } 2098 2099 static void 2100 sppp_lcp_TO(void *cookie) 2101 { 2102 sppp_to_event(&lcp, (struct sppp *)cookie); 2103 } 2104 2105 /* 2106 * Analyze a configure request. Return true if it was agreeable, and 2107 * caused action sca, false if it has been rejected or nak'ed, and 2108 * caused action scn. (The return value is used to make the state 2109 * transition decision in the state automaton.) 2110 */ 2111 static int 2112 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2113 { 2114 STDDCL; 2115 u_char *buf, *r, *p; 2116 int origlen, rlen; 2117 uint32_t nmagic; 2118 u_short authproto; 2119 2120 len -= 4; 2121 origlen = len; 2122 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2123 if (! buf) 2124 return (0); 2125 2126 if (debug) 2127 log(LOG_DEBUG, "%s: lcp parse opts:", 2128 ifp->if_xname); 2129 2130 /* pass 1: check for things that need to be rejected */ 2131 p = (void *)(h + 1); 2132 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2133 /* Sanity check option length */ 2134 if (p[1] > len) { 2135 /* 2136 * Malicious option - drop immediately. 2137 * XXX Maybe we should just RXJ it? 2138 */ 2139 addlog("%s: received malicious LCP option 0x%02x, " 2140 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2141 p[0], p[1], len); 2142 goto drop; 2143 } 2144 if (debug) 2145 addlog(" %s", sppp_lcp_opt_name(*p)); 2146 switch (*p) { 2147 case LCP_OPT_MAGIC: 2148 /* Magic number. */ 2149 /* fall through, both are same length */ 2150 case LCP_OPT_ASYNC_MAP: 2151 /* Async control character map. */ 2152 if (len >= 6 || p[1] == 6) 2153 continue; 2154 if (debug) 2155 addlog(" [invalid]"); 2156 break; 2157 case LCP_OPT_MRU: 2158 /* Maximum receive unit. */ 2159 if (len >= 4 && p[1] == 4) 2160 continue; 2161 if (debug) 2162 addlog(" [invalid]"); 2163 break; 2164 case LCP_OPT_AUTH_PROTO: 2165 if (len < 4) { 2166 if (debug) 2167 addlog(" [invalid]"); 2168 break; 2169 } 2170 authproto = (p[2] << 8) + p[3]; 2171 if (authproto == PPP_CHAP && p[1] != 5) { 2172 if (debug) 2173 addlog(" [invalid chap len]"); 2174 break; 2175 } 2176 if (sp->myauth.proto == 0) { 2177 /* we are not configured to do auth */ 2178 if (debug) 2179 addlog(" [not configured]"); 2180 break; 2181 } 2182 /* 2183 * Remote want us to authenticate, remember this, 2184 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2185 * up. 2186 */ 2187 sp->pp_flags |= PP_NEEDAUTH; 2188 continue; 2189 default: 2190 /* Others not supported. */ 2191 if (debug) 2192 addlog(" [rej]"); 2193 break; 2194 } 2195 /* Add the option to rejected list. */ 2196 bcopy (p, r, p[1]); 2197 r += p[1]; 2198 rlen += p[1]; 2199 } 2200 if (rlen) { 2201 if (debug) 2202 addlog(" send conf-rej\n"); 2203 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2204 goto end; 2205 } else if (debug) 2206 addlog("\n"); 2207 2208 /* 2209 * pass 2: check for option values that are unacceptable and 2210 * thus require to be nak'ed. 2211 */ 2212 if (debug) 2213 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2214 ifp->if_xname); 2215 2216 p = (void *)(h + 1); 2217 len = origlen; 2218 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2219 if (debug) 2220 addlog(" %s", sppp_lcp_opt_name(*p)); 2221 switch (*p) { 2222 case LCP_OPT_MAGIC: 2223 /* Magic number -- extract. */ 2224 nmagic = (uint32_t)p[2] << 24 | 2225 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2226 if (nmagic != sp->lcp.magic) { 2227 if (debug) 2228 addlog(" 0x%x", nmagic); 2229 continue; 2230 } 2231 /* 2232 * Local and remote magics equal -- loopback? 2233 */ 2234 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2235 printf ("%s: loopback\n", 2236 ifp->if_xname); 2237 sp->pp_loopcnt = 0; 2238 if (ifp->if_flags & IFF_UP) { 2239 if_down(ifp); 2240 IF_PURGE(&sp->pp_cpq); 2241 /* XXX ? */ 2242 lcp.Down(sp); 2243 lcp.Up(sp); 2244 } 2245 } else if (debug) 2246 addlog(" [glitch]"); 2247 ++sp->pp_loopcnt; 2248 /* 2249 * We negate our magic here, and NAK it. If 2250 * we see it later in an NAK packet, we 2251 * suggest a new one. 2252 */ 2253 nmagic = ~sp->lcp.magic; 2254 /* Gonna NAK it. */ 2255 p[2] = nmagic >> 24; 2256 p[3] = nmagic >> 16; 2257 p[4] = nmagic >> 8; 2258 p[5] = nmagic; 2259 break; 2260 2261 case LCP_OPT_ASYNC_MAP: 2262 /* 2263 * Async control character map -- just ignore it. 2264 * 2265 * Quote from RFC 1662, chapter 6: 2266 * To enable this functionality, synchronous PPP 2267 * implementations MUST always respond to the 2268 * Async-Control-Character-Map Configuration 2269 * Option with the LCP Configure-Ack. However, 2270 * acceptance of the Configuration Option does 2271 * not imply that the synchronous implementation 2272 * will do any ACCM mapping. Instead, all such 2273 * octet mapping will be performed by the 2274 * asynchronous-to-synchronous converter. 2275 */ 2276 continue; 2277 2278 case LCP_OPT_MRU: 2279 /* 2280 * Maximum receive unit. Always agreeable, 2281 * but ignored by now. 2282 */ 2283 sp->lcp.their_mru = p[2] * 256 + p[3]; 2284 if (debug) 2285 addlog(" %ld", sp->lcp.their_mru); 2286 continue; 2287 2288 case LCP_OPT_AUTH_PROTO: 2289 authproto = (p[2] << 8) + p[3]; 2290 if (sp->myauth.proto != authproto) { 2291 /* not agreed, nak */ 2292 if (debug) 2293 addlog(" [mine %s != his %s]", 2294 sppp_proto_name(sp->myauth.proto), 2295 sppp_proto_name(authproto)); 2296 p[2] = sp->myauth.proto >> 8; 2297 p[3] = sp->myauth.proto; 2298 break; 2299 } 2300 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2301 if (debug) 2302 addlog(" [chap not MD5]"); 2303 p[4] = CHAP_MD5; 2304 break; 2305 } 2306 continue; 2307 } 2308 /* Add the option to nak'ed list. */ 2309 bcopy (p, r, p[1]); 2310 r += p[1]; 2311 rlen += p[1]; 2312 } 2313 if (rlen) { 2314 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2315 if (debug) 2316 addlog(" max_failure (%d) exceeded, " 2317 "send conf-rej\n", 2318 sp->lcp.max_failure); 2319 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2320 } else { 2321 if (debug) 2322 addlog(" send conf-nak\n"); 2323 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2324 } 2325 goto end; 2326 } else { 2327 if (debug) 2328 addlog(" send conf-ack\n"); 2329 sp->fail_counter[IDX_LCP] = 0; 2330 sp->pp_loopcnt = 0; 2331 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2332 } 2333 2334 end: 2335 free(buf, M_TEMP); 2336 return (rlen == 0); 2337 2338 drop: 2339 free(buf, M_TEMP); 2340 return -1; 2341 } 2342 2343 /* 2344 * Analyze the LCP Configure-Reject option list, and adjust our 2345 * negotiation. 2346 */ 2347 static void 2348 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2349 { 2350 STDDCL; 2351 u_char *buf, *p; 2352 2353 len -= 4; 2354 buf = malloc (len, M_TEMP, M_NOWAIT); 2355 if (!buf) 2356 return; 2357 2358 if (debug) 2359 log(LOG_DEBUG, "%s: lcp rej opts:", 2360 ifp->if_xname); 2361 2362 p = (void *)(h + 1); 2363 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2364 /* Sanity check option length */ 2365 if (p[1] > len) { 2366 /* 2367 * Malicious option - drop immediately. 2368 * XXX Maybe we should just RXJ it? 2369 */ 2370 addlog("%s: received malicious LCP option, " 2371 "dropping.\n", ifp->if_xname); 2372 goto drop; 2373 } 2374 if (debug) 2375 addlog(" %s", sppp_lcp_opt_name(*p)); 2376 switch (*p) { 2377 case LCP_OPT_MAGIC: 2378 /* Magic number -- can't use it, use 0 */ 2379 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2380 sp->lcp.magic = 0; 2381 break; 2382 case LCP_OPT_MRU: 2383 /* 2384 * We try to negotiate a lower MRU if the underlying 2385 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2386 * peer rejects this lower rate, fallback to the 2387 * default. 2388 */ 2389 if (debug) { 2390 addlog("%s: warning: peer rejected our MRU of " 2391 "%ld bytes. Defaulting to %d bytes\n", 2392 ifp->if_xname, sp->lcp.mru, PP_MTU); 2393 } 2394 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2395 sp->lcp.mru = PP_MTU; 2396 break; 2397 case LCP_OPT_AUTH_PROTO: 2398 /* 2399 * Peer doesn't want to authenticate himself, 2400 * deny unless this is a dialout call, and 2401 * SPPP_AUTHFLAG_NOCALLOUT is set. 2402 */ 2403 if ((sp->pp_flags & PP_CALLIN) == 0 && 2404 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2405 if (debug) 2406 addlog(" [don't insist on auth " 2407 "for callout]"); 2408 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2409 break; 2410 } 2411 if (debug) 2412 addlog("[access denied]\n"); 2413 lcp.Close(sp); 2414 break; 2415 } 2416 } 2417 if (debug) 2418 addlog("\n"); 2419 drop: 2420 free(buf, M_TEMP); 2421 return; 2422 } 2423 2424 /* 2425 * Analyze the LCP Configure-NAK option list, and adjust our 2426 * negotiation. 2427 */ 2428 static void 2429 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2430 { 2431 STDDCL; 2432 u_char *buf, *p; 2433 uint32_t magic; 2434 2435 len -= 4; 2436 buf = malloc (len, M_TEMP, M_NOWAIT); 2437 if (!buf) 2438 return; 2439 2440 if (debug) 2441 log(LOG_DEBUG, "%s: lcp nak opts:", 2442 ifp->if_xname); 2443 2444 p = (void *)(h + 1); 2445 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2446 /* Sanity check option length */ 2447 if (p[1] > len) { 2448 /* 2449 * Malicious option - drop immediately. 2450 * XXX Maybe we should just RXJ it? 2451 */ 2452 addlog("%s: received malicious LCP option, " 2453 "dropping.\n", ifp->if_xname); 2454 goto drop; 2455 } 2456 if (debug) 2457 addlog(" %s", sppp_lcp_opt_name(*p)); 2458 switch (*p) { 2459 case LCP_OPT_MAGIC: 2460 /* Magic number -- renegotiate */ 2461 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2462 len >= 6 && p[1] == 6) { 2463 magic = (uint32_t)p[2] << 24 | 2464 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2465 /* 2466 * If the remote magic is our negated one, 2467 * this looks like a loopback problem. 2468 * Suggest a new magic to make sure. 2469 */ 2470 if (magic == ~sp->lcp.magic) { 2471 if (debug) 2472 addlog(" magic glitch"); 2473 sp->lcp.magic = arc4random(); 2474 } else { 2475 sp->lcp.magic = magic; 2476 if (debug) 2477 addlog(" %d", magic); 2478 } 2479 } 2480 break; 2481 case LCP_OPT_MRU: 2482 /* 2483 * Peer wants to advise us to negotiate an MRU. 2484 * Agree on it if it's reasonable, or use 2485 * default otherwise. 2486 */ 2487 if (len >= 4 && p[1] == 4) { 2488 u_int mru = p[2] * 256 + p[3]; 2489 if (debug) 2490 addlog(" %d", mru); 2491 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2492 mru = sp->pp_if.if_mtu; 2493 sp->lcp.mru = mru; 2494 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2495 } 2496 break; 2497 case LCP_OPT_AUTH_PROTO: 2498 /* 2499 * Peer doesn't like our authentication method, 2500 * deny. 2501 */ 2502 if (debug) 2503 addlog("[access denied]\n"); 2504 lcp.Close(sp); 2505 break; 2506 } 2507 } 2508 if (debug) 2509 addlog("\n"); 2510 drop: 2511 free(buf, M_TEMP); 2512 return; 2513 } 2514 2515 static void 2516 sppp_lcp_tlu(struct sppp *sp) 2517 { 2518 STDDCL; 2519 int i; 2520 uint32_t mask; 2521 2522 /* XXX ? */ 2523 if (! (ifp->if_flags & IFF_UP) && 2524 (ifp->if_flags & IFF_RUNNING)) { 2525 /* Coming out of loopback mode. */ 2526 if_up(ifp); 2527 } 2528 2529 for (i = 0; i < IDX_COUNT; i++) 2530 if ((cps[i])->flags & CP_QUAL) 2531 (cps[i])->Open(sp); 2532 2533 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2534 (sp->pp_flags & PP_NEEDAUTH) != 0) 2535 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2536 else 2537 sp->pp_phase = SPPP_PHASE_NETWORK; 2538 2539 if (debug) 2540 { 2541 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2542 sppp_phase_name(sp->pp_phase)); 2543 } 2544 2545 /* 2546 * Open all authentication protocols. This is even required 2547 * if we already proceeded to network phase, since it might be 2548 * that remote wants us to authenticate, so we might have to 2549 * send a PAP request. Undesired authentication protocols 2550 * don't do anything when they get an Open event. 2551 */ 2552 for (i = 0; i < IDX_COUNT; i++) 2553 if ((cps[i])->flags & CP_AUTH) 2554 (cps[i])->Open(sp); 2555 2556 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2557 /* Notify all NCPs. */ 2558 for (i = 0; i < IDX_COUNT; i++) 2559 if ((cps[i])->flags & CP_NCP) 2560 (cps[i])->Open(sp); 2561 } 2562 2563 /* Send Up events to all started protos. */ 2564 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2565 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2566 (cps[i])->Up(sp); 2567 2568 /* notify low-level driver of state change */ 2569 if (sp->pp_chg) 2570 sp->pp_chg(sp, (int)sp->pp_phase); 2571 2572 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2573 /* if no NCP is starting, close down */ 2574 sppp_lcp_check_and_close(sp); 2575 } 2576 2577 static void 2578 sppp_lcp_tld(struct sppp *sp) 2579 { 2580 STDDCL; 2581 int i; 2582 uint32_t mask; 2583 2584 sp->pp_phase = SPPP_PHASE_TERMINATE; 2585 2586 if (debug) 2587 { 2588 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2589 sppp_phase_name(sp->pp_phase)); 2590 } 2591 2592 /* 2593 * Take upper layers down. We send the Down event first and 2594 * the Close second to prevent the upper layers from sending 2595 * ``a flurry of terminate-request packets'', as the RFC 2596 * describes it. 2597 */ 2598 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2599 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2600 (cps[i])->Down(sp); 2601 (cps[i])->Close(sp); 2602 } 2603 } 2604 2605 static void 2606 sppp_lcp_tls(struct sppp *sp) 2607 { 2608 STDDCL; 2609 2610 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2611 printf("%s: authentication failed %d times, not retrying again\n", 2612 sp->pp_if.if_xname, sp->pp_auth_failures); 2613 if_down(&sp->pp_if); 2614 return; 2615 } 2616 2617 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2618 2619 if (debug) 2620 { 2621 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2622 sppp_phase_name(sp->pp_phase)); 2623 } 2624 2625 /* Notify lower layer if desired. */ 2626 if (sp->pp_tls) 2627 (sp->pp_tls)(sp); 2628 } 2629 2630 static void 2631 sppp_lcp_tlf(struct sppp *sp) 2632 { 2633 STDDCL; 2634 2635 sp->pp_phase = SPPP_PHASE_DEAD; 2636 2637 if (debug) 2638 { 2639 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2640 sppp_phase_name(sp->pp_phase)); 2641 } 2642 2643 /* Notify lower layer if desired. */ 2644 if (sp->pp_tlf) 2645 (sp->pp_tlf)(sp); 2646 } 2647 2648 static void 2649 sppp_lcp_scr(struct sppp *sp) 2650 { 2651 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2652 int i = 0; 2653 u_short authproto; 2654 2655 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2656 if (! sp->lcp.magic) 2657 sp->lcp.magic = arc4random(); 2658 opt[i++] = LCP_OPT_MAGIC; 2659 opt[i++] = 6; 2660 opt[i++] = sp->lcp.magic >> 24; 2661 opt[i++] = sp->lcp.magic >> 16; 2662 opt[i++] = sp->lcp.magic >> 8; 2663 opt[i++] = sp->lcp.magic; 2664 } 2665 2666 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2667 opt[i++] = LCP_OPT_MRU; 2668 opt[i++] = 4; 2669 opt[i++] = sp->lcp.mru >> 8; 2670 opt[i++] = sp->lcp.mru; 2671 } 2672 2673 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2674 authproto = sp->hisauth.proto; 2675 opt[i++] = LCP_OPT_AUTH_PROTO; 2676 opt[i++] = authproto == PPP_CHAP? 5: 4; 2677 opt[i++] = authproto >> 8; 2678 opt[i++] = authproto; 2679 if (authproto == PPP_CHAP) 2680 opt[i++] = CHAP_MD5; 2681 } 2682 2683 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2684 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2685 } 2686 2687 /* 2688 * Check the open NCPs, return true if at least one NCP is open. 2689 */ 2690 static int 2691 sppp_ncp_check(struct sppp *sp) 2692 { 2693 int i, mask; 2694 2695 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2696 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2697 return 1; 2698 return 0; 2699 } 2700 2701 /* 2702 * Re-check the open NCPs and see if we should terminate the link. 2703 * Called by the NCPs during their tlf action handling. 2704 */ 2705 static void 2706 sppp_lcp_check_and_close(struct sppp *sp) 2707 { 2708 2709 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2710 /* don't bother, we are already going down */ 2711 return; 2712 2713 if (sppp_ncp_check(sp)) 2714 return; 2715 2716 lcp.Close(sp); 2717 } 2718 2719 2720 /* 2721 *--------------------------------------------------------------------------* 2722 * * 2723 * The IPCP implementation. * 2724 * * 2725 *--------------------------------------------------------------------------* 2726 */ 2727 2728 static void 2729 sppp_ipcp_init(struct sppp *sp) 2730 { 2731 sp->ipcp.opts = 0; 2732 sp->ipcp.flags = 0; 2733 sp->state[IDX_IPCP] = STATE_INITIAL; 2734 sp->fail_counter[IDX_IPCP] = 0; 2735 sp->pp_seq[IDX_IPCP] = 0; 2736 sp->pp_rseq[IDX_IPCP] = 0; 2737 callout_init(&sp->ch[IDX_IPCP], 0); 2738 } 2739 2740 static void 2741 sppp_ipcp_up(struct sppp *sp) 2742 { 2743 sppp_up_event(&ipcp, sp); 2744 } 2745 2746 static void 2747 sppp_ipcp_down(struct sppp *sp) 2748 { 2749 sppp_down_event(&ipcp, sp); 2750 } 2751 2752 static void 2753 sppp_ipcp_open(struct sppp *sp) 2754 { 2755 STDDCL; 2756 uint32_t myaddr, hisaddr; 2757 2758 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2759 sp->ipcp.req_myaddr = 0; 2760 sp->ipcp.req_hisaddr = 0; 2761 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2762 2763 #ifdef INET 2764 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2765 #else 2766 myaddr = hisaddr = 0; 2767 #endif 2768 /* 2769 * If we don't have his address, this probably means our 2770 * interface doesn't want to talk IP at all. (This could 2771 * be the case if somebody wants to speak only IPX, for 2772 * example.) Don't open IPCP in this case. 2773 */ 2774 if (hisaddr == 0) { 2775 /* XXX this message should go away */ 2776 if (debug) 2777 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2778 ifp->if_xname); 2779 return; 2780 } 2781 2782 if (myaddr == 0) { 2783 /* 2784 * I don't have an assigned address, so i need to 2785 * negotiate my address. 2786 */ 2787 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2788 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2789 } 2790 if (hisaddr == 1) { 2791 /* 2792 * XXX - remove this hack! 2793 * remote has no valid address, we need to get one assigned. 2794 */ 2795 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2796 } 2797 sppp_open_event(&ipcp, sp); 2798 } 2799 2800 static void 2801 sppp_ipcp_close(struct sppp *sp) 2802 { 2803 STDDCL; 2804 2805 sppp_close_event(&ipcp, sp); 2806 #ifdef INET 2807 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2808 /* 2809 * Some address was dynamic, clear it again. 2810 */ 2811 sppp_clear_ip_addrs(sp); 2812 #endif 2813 2814 if (sp->pp_saved_mtu > 0) { 2815 ifp->if_mtu = sp->pp_saved_mtu; 2816 sp->pp_saved_mtu = 0; 2817 if (debug) 2818 log(LOG_DEBUG, 2819 "%s: resetting MTU to %" PRIu64 " bytes\n", 2820 ifp->if_xname, ifp->if_mtu); 2821 } 2822 } 2823 2824 static void 2825 sppp_ipcp_TO(void *cookie) 2826 { 2827 sppp_to_event(&ipcp, (struct sppp *)cookie); 2828 } 2829 2830 /* 2831 * Analyze a configure request. Return true if it was agreeable, and 2832 * caused action sca, false if it has been rejected or nak'ed, and 2833 * caused action scn. (The return value is used to make the state 2834 * transition decision in the state automaton.) 2835 */ 2836 static int 2837 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2838 { 2839 u_char *buf, *r, *p; 2840 struct ifnet *ifp = &sp->pp_if; 2841 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2842 uint32_t hisaddr, desiredaddr; 2843 2844 len -= 4; 2845 origlen = len; 2846 /* 2847 * Make sure to allocate a buf that can at least hold a 2848 * conf-nak with an `address' option. We might need it below. 2849 */ 2850 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2851 if (! buf) 2852 return (0); 2853 2854 /* pass 1: see if we can recognize them */ 2855 if (debug) 2856 log(LOG_DEBUG, "%s: ipcp parse opts:", 2857 ifp->if_xname); 2858 p = (void *)(h + 1); 2859 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2860 /* Sanity check option length */ 2861 if (p[1] > len) { 2862 /* XXX should we just RXJ? */ 2863 addlog("%s: malicious IPCP option received, dropping\n", 2864 ifp->if_xname); 2865 goto drop; 2866 } 2867 if (debug) 2868 addlog(" %s", sppp_ipcp_opt_name(*p)); 2869 switch (*p) { 2870 #ifdef notyet 2871 case IPCP_OPT_COMPRESSION: 2872 if (len >= 6 && p[1] >= 6) { 2873 /* correctly formed compress option */ 2874 continue; 2875 } 2876 if (debug) 2877 addlog(" [invalid]"); 2878 break; 2879 #endif 2880 case IPCP_OPT_ADDRESS: 2881 if (len >= 6 && p[1] == 6) { 2882 /* correctly formed address option */ 2883 continue; 2884 } 2885 if (debug) 2886 addlog(" [invalid]"); 2887 break; 2888 default: 2889 /* Others not supported. */ 2890 if (debug) 2891 addlog(" [rej]"); 2892 break; 2893 } 2894 /* Add the option to rejected list. */ 2895 bcopy (p, r, p[1]); 2896 r += p[1]; 2897 rlen += p[1]; 2898 } 2899 if (rlen) { 2900 if (debug) 2901 addlog(" send conf-rej\n"); 2902 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2903 goto end; 2904 } else if (debug) 2905 addlog("\n"); 2906 2907 /* pass 2: parse option values */ 2908 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2909 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2910 else 2911 #ifdef INET 2912 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2913 #else 2914 hisaddr = 0; 2915 #endif 2916 if (debug) 2917 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2918 ifp->if_xname); 2919 p = (void *)(h + 1); 2920 len = origlen; 2921 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2922 if (debug) 2923 addlog(" %s", sppp_ipcp_opt_name(*p)); 2924 switch (*p) { 2925 #ifdef notyet 2926 case IPCP_OPT_COMPRESSION: 2927 continue; 2928 #endif 2929 case IPCP_OPT_ADDRESS: 2930 desiredaddr = p[2] << 24 | p[3] << 16 | 2931 p[4] << 8 | p[5]; 2932 if (desiredaddr == hisaddr || 2933 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2934 /* 2935 * Peer's address is same as our value, 2936 * this is agreeable. Gonna conf-ack 2937 * it. 2938 */ 2939 if (debug) 2940 addlog(" %s [ack]", 2941 sppp_dotted_quad(hisaddr)); 2942 /* record that we've seen it already */ 2943 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2944 sp->ipcp.req_hisaddr = desiredaddr; 2945 hisaddr = desiredaddr; 2946 continue; 2947 } 2948 /* 2949 * The address wasn't agreeable. This is either 2950 * he sent us 0.0.0.0, asking to assign him an 2951 * address, or he send us another address not 2952 * matching our value. Either case, we gonna 2953 * conf-nak it with our value. 2954 */ 2955 if (debug) { 2956 if (desiredaddr == 0) 2957 addlog(" [addr requested]"); 2958 else 2959 addlog(" %s [not agreed]", 2960 sppp_dotted_quad(desiredaddr)); 2961 } 2962 2963 p[2] = hisaddr >> 24; 2964 p[3] = hisaddr >> 16; 2965 p[4] = hisaddr >> 8; 2966 p[5] = hisaddr; 2967 break; 2968 } 2969 /* Add the option to nak'ed list. */ 2970 bcopy (p, r, p[1]); 2971 r += p[1]; 2972 rlen += p[1]; 2973 } 2974 2975 /* 2976 * If we are about to conf-ack the request, but haven't seen 2977 * his address so far, gonna conf-nak it instead, with the 2978 * `address' option present and our idea of his address being 2979 * filled in there, to request negotiation of both addresses. 2980 * 2981 * XXX This can result in an endless req - nak loop if peer 2982 * doesn't want to send us his address. Q: What should we do 2983 * about it? XXX A: implement the max-failure counter. 2984 */ 2985 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2986 buf[0] = IPCP_OPT_ADDRESS; 2987 buf[1] = 6; 2988 buf[2] = hisaddr >> 24; 2989 buf[3] = hisaddr >> 16; 2990 buf[4] = hisaddr >> 8; 2991 buf[5] = hisaddr; 2992 rlen = 6; 2993 if (debug) 2994 addlog(" still need hisaddr"); 2995 } 2996 2997 if (rlen) { 2998 if (debug) 2999 addlog(" send conf-nak\n"); 3000 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3001 } else { 3002 if (debug) 3003 addlog(" send conf-ack\n"); 3004 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3005 } 3006 3007 end: 3008 free(buf, M_TEMP); 3009 return (rlen == 0); 3010 3011 drop: 3012 free(buf, M_TEMP); 3013 return -1; 3014 } 3015 3016 /* 3017 * Analyze the IPCP Configure-Reject option list, and adjust our 3018 * negotiation. 3019 */ 3020 static void 3021 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3022 { 3023 u_char *buf, *p; 3024 struct ifnet *ifp = &sp->pp_if; 3025 int debug = ifp->if_flags & IFF_DEBUG; 3026 3027 len -= 4; 3028 buf = malloc (len, M_TEMP, M_NOWAIT); 3029 if (!buf) 3030 return; 3031 3032 if (debug) 3033 log(LOG_DEBUG, "%s: ipcp rej opts:", 3034 ifp->if_xname); 3035 3036 p = (void *)(h + 1); 3037 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3038 /* Sanity check option length */ 3039 if (p[1] > len) { 3040 /* XXX should we just RXJ? */ 3041 addlog("%s: malicious IPCP option received, dropping\n", 3042 ifp->if_xname); 3043 goto drop; 3044 } 3045 if (debug) 3046 addlog(" %s", sppp_ipcp_opt_name(*p)); 3047 switch (*p) { 3048 case IPCP_OPT_ADDRESS: 3049 /* 3050 * Peer doesn't grok address option. This is 3051 * bad. XXX Should we better give up here? 3052 */ 3053 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3054 break; 3055 #ifdef notyet 3056 case IPCP_OPT_COMPRESS: 3057 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3058 break; 3059 #endif 3060 } 3061 } 3062 if (debug) 3063 addlog("\n"); 3064 drop: 3065 free(buf, M_TEMP); 3066 return; 3067 } 3068 3069 /* 3070 * Analyze the IPCP Configure-NAK option list, and adjust our 3071 * negotiation. 3072 */ 3073 static void 3074 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3075 { 3076 u_char *p; 3077 struct ifnet *ifp = &sp->pp_if; 3078 int debug = ifp->if_flags & IFF_DEBUG; 3079 uint32_t wantaddr; 3080 3081 len -= 4; 3082 3083 if (debug) 3084 log(LOG_DEBUG, "%s: ipcp nak opts:", 3085 ifp->if_xname); 3086 3087 p = (void *)(h + 1); 3088 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3089 /* Sanity check option length */ 3090 if (p[1] > len) { 3091 /* XXX should we just RXJ? */ 3092 addlog("%s: malicious IPCP option received, dropping\n", 3093 ifp->if_xname); 3094 return; 3095 } 3096 if (debug) 3097 addlog(" %s", sppp_ipcp_opt_name(*p)); 3098 switch (*p) { 3099 case IPCP_OPT_ADDRESS: 3100 /* 3101 * Peer doesn't like our local IP address. See 3102 * if we can do something for him. We'll drop 3103 * him our address then. 3104 */ 3105 if (len >= 6 && p[1] == 6) { 3106 wantaddr = p[2] << 24 | p[3] << 16 | 3107 p[4] << 8 | p[5]; 3108 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3109 if (debug) 3110 addlog(" [wantaddr %s]", 3111 sppp_dotted_quad(wantaddr)); 3112 /* 3113 * When doing dynamic address assignment, 3114 * we accept his offer. Otherwise, we 3115 * ignore it and thus continue to negotiate 3116 * our already existing value. 3117 */ 3118 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3119 if (debug) 3120 addlog(" [agree]"); 3121 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3122 sp->ipcp.req_myaddr = wantaddr; 3123 } 3124 } 3125 break; 3126 3127 case IPCP_OPT_PRIMDNS: 3128 if (len >= 6 && p[1] == 6) { 3129 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3130 p[4] << 8 | p[5]; 3131 } 3132 break; 3133 3134 case IPCP_OPT_SECDNS: 3135 if (len >= 6 && p[1] == 6) { 3136 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3137 p[4] << 8 | p[5]; 3138 } 3139 break; 3140 #ifdef notyet 3141 case IPCP_OPT_COMPRESS: 3142 /* 3143 * Peer wants different compression parameters. 3144 */ 3145 break; 3146 #endif 3147 } 3148 } 3149 if (debug) 3150 addlog("\n"); 3151 } 3152 3153 static void 3154 sppp_ipcp_tlu(struct sppp *sp) 3155 { 3156 #ifdef INET 3157 /* we are up. Set addresses and notify anyone interested */ 3158 STDDCL; 3159 uint32_t myaddr, hisaddr; 3160 3161 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3162 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3163 myaddr = sp->ipcp.req_myaddr; 3164 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3165 hisaddr = sp->ipcp.req_hisaddr; 3166 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3167 3168 if (ifp->if_mtu > sp->lcp.their_mru) { 3169 sp->pp_saved_mtu = ifp->if_mtu; 3170 ifp->if_mtu = sp->lcp.their_mru; 3171 if (debug) 3172 log(LOG_DEBUG, 3173 "%s: setting MTU to %" PRIu64 " bytes\n", 3174 ifp->if_xname, ifp->if_mtu); 3175 } 3176 3177 if (sp->pp_con) 3178 sp->pp_con(sp); 3179 #endif 3180 } 3181 3182 static void 3183 sppp_ipcp_tld(struct sppp *sp) 3184 { 3185 } 3186 3187 static void 3188 sppp_ipcp_tls(struct sppp *sp) 3189 { 3190 /* indicate to LCP that it must stay alive */ 3191 sp->lcp.protos |= (1 << IDX_IPCP); 3192 } 3193 3194 static void 3195 sppp_ipcp_tlf(struct sppp *sp) 3196 { 3197 /* we no longer need LCP */ 3198 sp->lcp.protos &= ~(1 << IDX_IPCP); 3199 } 3200 3201 static void 3202 sppp_ipcp_scr(struct sppp *sp) 3203 { 3204 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3205 #ifdef INET 3206 uint32_t ouraddr; 3207 #endif 3208 int i = 0; 3209 3210 #ifdef notyet 3211 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3212 opt[i++] = IPCP_OPT_COMPRESSION; 3213 opt[i++] = 6; 3214 opt[i++] = 0; /* VJ header compression */ 3215 opt[i++] = 0x2d; /* VJ header compression */ 3216 opt[i++] = max_slot_id; 3217 opt[i++] = comp_slot_id; 3218 } 3219 #endif 3220 3221 #ifdef INET 3222 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3223 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3224 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3225 else 3226 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3227 opt[i++] = IPCP_OPT_ADDRESS; 3228 opt[i++] = 6; 3229 opt[i++] = ouraddr >> 24; 3230 opt[i++] = ouraddr >> 16; 3231 opt[i++] = ouraddr >> 8; 3232 opt[i++] = ouraddr; 3233 } 3234 #endif 3235 3236 if (sp->query_dns & 1) { 3237 opt[i++] = IPCP_OPT_PRIMDNS; 3238 opt[i++] = 6; 3239 opt[i++] = sp->dns_addrs[0] >> 24; 3240 opt[i++] = sp->dns_addrs[0] >> 16; 3241 opt[i++] = sp->dns_addrs[0] >> 8; 3242 opt[i++] = sp->dns_addrs[0]; 3243 } 3244 if (sp->query_dns & 2) { 3245 opt[i++] = IPCP_OPT_SECDNS; 3246 opt[i++] = 6; 3247 opt[i++] = sp->dns_addrs[1] >> 24; 3248 opt[i++] = sp->dns_addrs[1] >> 16; 3249 opt[i++] = sp->dns_addrs[1] >> 8; 3250 opt[i++] = sp->dns_addrs[1]; 3251 } 3252 3253 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3254 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3255 } 3256 3257 3258 /* 3259 *--------------------------------------------------------------------------* 3260 * * 3261 * The IPv6CP implementation. * 3262 * * 3263 *--------------------------------------------------------------------------* 3264 */ 3265 3266 #ifdef INET6 3267 static void 3268 sppp_ipv6cp_init(struct sppp *sp) 3269 { 3270 sp->ipv6cp.opts = 0; 3271 sp->ipv6cp.flags = 0; 3272 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3273 sp->fail_counter[IDX_IPV6CP] = 0; 3274 sp->pp_seq[IDX_IPV6CP] = 0; 3275 sp->pp_rseq[IDX_IPV6CP] = 0; 3276 callout_init(&sp->ch[IDX_IPV6CP], 0); 3277 } 3278 3279 static void 3280 sppp_ipv6cp_up(struct sppp *sp) 3281 { 3282 sppp_up_event(&ipv6cp, sp); 3283 } 3284 3285 static void 3286 sppp_ipv6cp_down(struct sppp *sp) 3287 { 3288 sppp_down_event(&ipv6cp, sp); 3289 } 3290 3291 static void 3292 sppp_ipv6cp_open(struct sppp *sp) 3293 { 3294 STDDCL; 3295 struct in6_addr myaddr, hisaddr; 3296 3297 #ifdef IPV6CP_MYIFID_DYN 3298 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3299 #else 3300 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3301 #endif 3302 3303 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3304 /* 3305 * If we don't have our address, this probably means our 3306 * interface doesn't want to talk IPv6 at all. (This could 3307 * be the case if somebody wants to speak only IPX, for 3308 * example.) Don't open IPv6CP in this case. 3309 */ 3310 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3311 /* XXX this message should go away */ 3312 if (debug) 3313 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3314 ifp->if_xname); 3315 return; 3316 } 3317 3318 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3319 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3320 sppp_open_event(&ipv6cp, sp); 3321 } 3322 3323 static void 3324 sppp_ipv6cp_close(struct sppp *sp) 3325 { 3326 sppp_close_event(&ipv6cp, sp); 3327 } 3328 3329 static void 3330 sppp_ipv6cp_TO(void *cookie) 3331 { 3332 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3333 } 3334 3335 /* 3336 * Analyze a configure request. Return true if it was agreeable, and 3337 * caused action sca, false if it has been rejected or nak'ed, and 3338 * caused action scn. (The return value is used to make the state 3339 * transition decision in the state automaton.) 3340 */ 3341 static int 3342 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3343 { 3344 u_char *buf, *r, *p; 3345 struct ifnet *ifp = &sp->pp_if; 3346 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3347 struct in6_addr myaddr, desiredaddr, suggestaddr; 3348 int ifidcount; 3349 int type; 3350 int collision, nohisaddr; 3351 3352 len -= 4; 3353 origlen = len; 3354 /* 3355 * Make sure to allocate a buf that can at least hold a 3356 * conf-nak with an `address' option. We might need it below. 3357 */ 3358 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3359 if (! buf) 3360 return (0); 3361 3362 /* pass 1: see if we can recognize them */ 3363 if (debug) 3364 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3365 ifp->if_xname); 3366 p = (void *)(h + 1); 3367 ifidcount = 0; 3368 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3369 /* Sanity check option length */ 3370 if (p[1] > len) { 3371 /* XXX just RXJ? */ 3372 addlog("%s: received malicious IPCPv6 option, " 3373 "dropping\n", ifp->if_xname); 3374 goto drop; 3375 } 3376 if (debug) 3377 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3378 switch (*p) { 3379 case IPV6CP_OPT_IFID: 3380 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3381 /* correctly formed address option */ 3382 ifidcount++; 3383 continue; 3384 } 3385 if (debug) 3386 addlog(" [invalid]"); 3387 break; 3388 #ifdef notyet 3389 case IPV6CP_OPT_COMPRESSION: 3390 if (len >= 4 && p[1] >= 4) { 3391 /* correctly formed compress option */ 3392 continue; 3393 } 3394 if (debug) 3395 addlog(" [invalid]"); 3396 break; 3397 #endif 3398 default: 3399 /* Others not supported. */ 3400 if (debug) 3401 addlog(" [rej]"); 3402 break; 3403 } 3404 /* Add the option to rejected list. */ 3405 bcopy (p, r, p[1]); 3406 r += p[1]; 3407 rlen += p[1]; 3408 } 3409 if (rlen) { 3410 if (debug) 3411 addlog(" send conf-rej\n"); 3412 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3413 goto end; 3414 } else if (debug) 3415 addlog("\n"); 3416 3417 /* pass 2: parse option values */ 3418 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3419 if (debug) 3420 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3421 ifp->if_xname); 3422 p = (void *)(h + 1); 3423 len = origlen; 3424 type = CONF_ACK; 3425 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3426 if (debug) 3427 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3428 switch (*p) { 3429 #ifdef notyet 3430 case IPV6CP_OPT_COMPRESSION: 3431 continue; 3432 #endif 3433 case IPV6CP_OPT_IFID: 3434 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3435 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3436 collision = (memcmp(&desiredaddr.s6_addr[8], 3437 &myaddr.s6_addr[8], 8) == 0); 3438 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3439 3440 desiredaddr.s6_addr16[0] = htons(0xfe80); 3441 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3442 3443 if (!collision && !nohisaddr) { 3444 /* no collision, hisaddr known - Conf-Ack */ 3445 type = CONF_ACK; 3446 3447 if (debug) { 3448 addlog(" %s [%s]", 3449 ip6_sprintf(&desiredaddr), 3450 sppp_cp_type_name(type)); 3451 } 3452 continue; 3453 } 3454 3455 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3456 if (collision && nohisaddr) { 3457 /* collision, hisaddr unknown - Conf-Rej */ 3458 type = CONF_REJ; 3459 memset(&p[2], 0, 8); 3460 } else { 3461 /* 3462 * - no collision, hisaddr unknown, or 3463 * - collision, hisaddr known 3464 * Conf-Nak, suggest hisaddr 3465 */ 3466 type = CONF_NAK; 3467 sppp_suggest_ip6_addr(sp, &suggestaddr); 3468 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3469 } 3470 if (debug) 3471 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3472 sppp_cp_type_name(type)); 3473 break; 3474 } 3475 /* Add the option to nak'ed list. */ 3476 bcopy (p, r, p[1]); 3477 r += p[1]; 3478 rlen += p[1]; 3479 } 3480 3481 if (rlen == 0 && type == CONF_ACK) { 3482 if (debug) 3483 addlog(" send %s\n", sppp_cp_type_name(type)); 3484 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3485 } else { 3486 #ifdef notdef 3487 if (type == CONF_ACK) 3488 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3489 #endif 3490 3491 if (debug) { 3492 addlog(" send %s suggest %s\n", 3493 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3494 } 3495 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3496 } 3497 3498 end: 3499 free(buf, M_TEMP); 3500 return (rlen == 0); 3501 3502 drop: 3503 free(buf, M_TEMP); 3504 return -1; 3505 } 3506 3507 /* 3508 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3509 * negotiation. 3510 */ 3511 static void 3512 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3513 { 3514 u_char *buf, *p; 3515 struct ifnet *ifp = &sp->pp_if; 3516 int debug = ifp->if_flags & IFF_DEBUG; 3517 3518 len -= 4; 3519 buf = malloc (len, M_TEMP, M_NOWAIT); 3520 if (!buf) 3521 return; 3522 3523 if (debug) 3524 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3525 ifp->if_xname); 3526 3527 p = (void *)(h + 1); 3528 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3529 if (p[1] > len) { 3530 /* XXX just RXJ? */ 3531 addlog("%s: received malicious IPCPv6 option, " 3532 "dropping\n", ifp->if_xname); 3533 goto drop; 3534 } 3535 if (debug) 3536 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3537 switch (*p) { 3538 case IPV6CP_OPT_IFID: 3539 /* 3540 * Peer doesn't grok address option. This is 3541 * bad. XXX Should we better give up here? 3542 */ 3543 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3544 break; 3545 #ifdef notyet 3546 case IPV6CP_OPT_COMPRESS: 3547 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3548 break; 3549 #endif 3550 } 3551 } 3552 if (debug) 3553 addlog("\n"); 3554 drop: 3555 free(buf, M_TEMP); 3556 return; 3557 } 3558 3559 /* 3560 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3561 * negotiation. 3562 */ 3563 static void 3564 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3565 { 3566 u_char *buf, *p; 3567 struct ifnet *ifp = &sp->pp_if; 3568 int debug = ifp->if_flags & IFF_DEBUG; 3569 struct in6_addr suggestaddr; 3570 3571 len -= 4; 3572 buf = malloc (len, M_TEMP, M_NOWAIT); 3573 if (!buf) 3574 return; 3575 3576 if (debug) 3577 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3578 ifp->if_xname); 3579 3580 p = (void *)(h + 1); 3581 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3582 if (p[1] > len) { 3583 /* XXX just RXJ? */ 3584 addlog("%s: received malicious IPCPv6 option, " 3585 "dropping\n", ifp->if_xname); 3586 goto drop; 3587 } 3588 if (debug) 3589 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3590 switch (*p) { 3591 case IPV6CP_OPT_IFID: 3592 /* 3593 * Peer doesn't like our local ifid. See 3594 * if we can do something for him. We'll drop 3595 * him our address then. 3596 */ 3597 if (len < 10 || p[1] != 10) 3598 break; 3599 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3600 suggestaddr.s6_addr16[0] = htons(0xfe80); 3601 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3602 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3603 3604 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3605 if (debug) 3606 addlog(" [suggestaddr %s]", 3607 ip6_sprintf(&suggestaddr)); 3608 #ifdef IPV6CP_MYIFID_DYN 3609 /* 3610 * When doing dynamic address assignment, 3611 * we accept his offer. 3612 */ 3613 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3614 struct in6_addr lastsuggest; 3615 /* 3616 * If <suggested myaddr from peer> equals to 3617 * <hisaddr we have suggested last time>, 3618 * we have a collision. generate new random 3619 * ifid. 3620 */ 3621 sppp_suggest_ip6_addr(&lastsuggest); 3622 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3623 lastsuggest)) { 3624 if (debug) 3625 addlog(" [random]"); 3626 sppp_gen_ip6_addr(sp, &suggestaddr); 3627 } 3628 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3629 if (debug) 3630 addlog(" [agree]"); 3631 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3632 } 3633 #else 3634 /* 3635 * Since we do not do dynamic address assignment, 3636 * we ignore it and thus continue to negotiate 3637 * our already existing value. This can possibly 3638 * go into infinite request-reject loop. 3639 * 3640 * This is not likely because we normally use 3641 * ifid based on MAC-address. 3642 * If you have no ethernet card on the node, too bad. 3643 * XXX should we use fail_counter? 3644 */ 3645 #endif 3646 break; 3647 #ifdef notyet 3648 case IPV6CP_OPT_COMPRESS: 3649 /* 3650 * Peer wants different compression parameters. 3651 */ 3652 break; 3653 #endif 3654 } 3655 } 3656 if (debug) 3657 addlog("\n"); 3658 drop: 3659 free(buf, M_TEMP); 3660 return; 3661 } 3662 3663 static void 3664 sppp_ipv6cp_tlu(struct sppp *sp) 3665 { 3666 /* we are up - notify isdn daemon */ 3667 if (sp->pp_con) 3668 sp->pp_con(sp); 3669 } 3670 3671 static void 3672 sppp_ipv6cp_tld(struct sppp *sp) 3673 { 3674 } 3675 3676 static void 3677 sppp_ipv6cp_tls(struct sppp *sp) 3678 { 3679 /* indicate to LCP that it must stay alive */ 3680 sp->lcp.protos |= (1 << IDX_IPV6CP); 3681 } 3682 3683 static void 3684 sppp_ipv6cp_tlf(struct sppp *sp) 3685 { 3686 /* we no longer need LCP */ 3687 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3688 } 3689 3690 static void 3691 sppp_ipv6cp_scr(struct sppp *sp) 3692 { 3693 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3694 struct in6_addr ouraddr; 3695 int i = 0; 3696 3697 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3698 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3699 opt[i++] = IPV6CP_OPT_IFID; 3700 opt[i++] = 10; 3701 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3702 i += 8; 3703 } 3704 3705 #ifdef notyet 3706 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3707 opt[i++] = IPV6CP_OPT_COMPRESSION; 3708 opt[i++] = 4; 3709 opt[i++] = 0; /* TBD */ 3710 opt[i++] = 0; /* TBD */ 3711 /* variable length data may follow */ 3712 } 3713 #endif 3714 3715 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3716 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3717 } 3718 #else /*INET6*/ 3719 static void 3720 sppp_ipv6cp_init(struct sppp *sp) 3721 { 3722 } 3723 3724 static void 3725 sppp_ipv6cp_up(struct sppp *sp) 3726 { 3727 } 3728 3729 static void 3730 sppp_ipv6cp_down(struct sppp *sp) 3731 { 3732 } 3733 3734 static void 3735 sppp_ipv6cp_open(struct sppp *sp) 3736 { 3737 } 3738 3739 static void 3740 sppp_ipv6cp_close(struct sppp *sp) 3741 { 3742 } 3743 3744 static void 3745 sppp_ipv6cp_TO(void *sp) 3746 { 3747 } 3748 3749 static int 3750 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3751 int len) 3752 { 3753 return 0; 3754 } 3755 3756 static void 3757 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3758 int len) 3759 { 3760 } 3761 3762 static void 3763 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3764 int len) 3765 { 3766 } 3767 3768 static void 3769 sppp_ipv6cp_tlu(struct sppp *sp) 3770 { 3771 } 3772 3773 static void 3774 sppp_ipv6cp_tld(struct sppp *sp) 3775 { 3776 } 3777 3778 static void 3779 sppp_ipv6cp_tls(struct sppp *sp) 3780 { 3781 } 3782 3783 static void 3784 sppp_ipv6cp_tlf(struct sppp *sp) 3785 { 3786 } 3787 3788 static void 3789 sppp_ipv6cp_scr(struct sppp *sp) 3790 { 3791 } 3792 #endif /*INET6*/ 3793 3794 3795 /* 3796 *--------------------------------------------------------------------------* 3797 * * 3798 * The CHAP implementation. * 3799 * * 3800 *--------------------------------------------------------------------------* 3801 */ 3802 3803 /* 3804 * The authentication protocols don't employ a full-fledged state machine as 3805 * the control protocols do, since they do have Open and Close events, but 3806 * not Up and Down, nor are they explicitly terminated. Also, use of the 3807 * authentication protocols may be different in both directions (this makes 3808 * sense, think of a machine that never accepts incoming calls but only 3809 * calls out, it doesn't require the called party to authenticate itself). 3810 * 3811 * Our state machine for the local authentication protocol (we are requesting 3812 * the peer to authenticate) looks like: 3813 * 3814 * RCA- 3815 * +--------------------------------------------+ 3816 * V scn,tld| 3817 * +--------+ Close +---------+ RCA+ 3818 * | |<----------------------------------| |------+ 3819 * +--->| Closed | TO* | Opened | sca | 3820 * | | |-----+ +-------| |<-----+ 3821 * | +--------+ irc | | +---------+ 3822 * | ^ | | ^ 3823 * | | | | | 3824 * | | | | | 3825 * | TO-| | | | 3826 * | |tld TO+ V | | 3827 * | | +------->+ | | 3828 * | | | | | | 3829 * | +--------+ V | | 3830 * | | |<----+<--------------------+ | 3831 * | | Req- | scr | 3832 * | | Sent | | 3833 * | | | | 3834 * | +--------+ | 3835 * | RCA- | | RCA+ | 3836 * +------+ +------------------------------------------+ 3837 * scn,tld sca,irc,ict,tlu 3838 * 3839 * 3840 * with: 3841 * 3842 * Open: LCP reached authentication phase 3843 * Close: LCP reached terminate phase 3844 * 3845 * RCA+: received reply (pap-req, chap-response), acceptable 3846 * RCN: received reply (pap-req, chap-response), not acceptable 3847 * TO+: timeout with restart counter >= 0 3848 * TO-: timeout with restart counter < 0 3849 * TO*: reschedule timeout for CHAP 3850 * 3851 * scr: send request packet (none for PAP, chap-challenge) 3852 * sca: send ack packet (pap-ack, chap-success) 3853 * scn: send nak packet (pap-nak, chap-failure) 3854 * ict: initialize re-challenge timer (CHAP only) 3855 * 3856 * tlu: this-layer-up, LCP reaches network phase 3857 * tld: this-layer-down, LCP enters terminate phase 3858 * 3859 * Note that in CHAP mode, after sending a new challenge, while the state 3860 * automaton falls back into Req-Sent state, it doesn't signal a tld 3861 * event to LCP, so LCP remains in network phase. Only after not getting 3862 * any response (or after getting an unacceptable response), CHAP closes, 3863 * causing LCP to enter terminate phase. 3864 * 3865 * With PAP, there is no initial request that can be sent. The peer is 3866 * expected to send one based on the successful negotiation of PAP as 3867 * the authentication protocol during the LCP option negotiation. 3868 * 3869 * Incoming authentication protocol requests (remote requests 3870 * authentication, we are peer) don't employ a state machine at all, 3871 * they are simply answered. Some peers [Ascend P50 firmware rev 3872 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3873 * still in authentication phase (thereby violating the standard that 3874 * demands that these NCP packets are to be discarded), so we keep 3875 * track of the peer demanding us to authenticate, and only proceed to 3876 * phase network once we've seen a positive acknowledge for the 3877 * authentication. 3878 */ 3879 3880 /* 3881 * Handle incoming CHAP packets. 3882 */ 3883 void 3884 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3885 { 3886 STDDCL; 3887 struct lcp_header *h; 3888 int len, x; 3889 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3890 int value_len, name_len; 3891 MD5_CTX ctx; 3892 3893 len = m->m_pkthdr.len; 3894 if (len < 4) { 3895 if (debug) 3896 log(LOG_DEBUG, 3897 "%s: chap invalid packet length: %d bytes\n", 3898 ifp->if_xname, len); 3899 return; 3900 } 3901 h = mtod(m, struct lcp_header *); 3902 if (len > ntohs(h->len)) 3903 len = ntohs(h->len); 3904 3905 switch (h->type) { 3906 /* challenge, failure and success are his authproto */ 3907 case CHAP_CHALLENGE: 3908 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3909 /* can't do anything usefull */ 3910 sp->pp_auth_failures++; 3911 printf("%s: chap input without my name and my secret being set\n", 3912 ifp->if_xname); 3913 break; 3914 } 3915 value = 1 + (u_char *)(h + 1); 3916 value_len = value[-1]; 3917 name = value + value_len; 3918 name_len = len - value_len - 5; 3919 if (name_len < 0) { 3920 if (debug) { 3921 log(LOG_DEBUG, 3922 "%s: chap corrupted challenge " 3923 "<%s id=0x%x len=%d", 3924 ifp->if_xname, 3925 sppp_auth_type_name(PPP_CHAP, h->type), 3926 h->ident, ntohs(h->len)); 3927 if (len > 4) 3928 sppp_print_bytes((u_char *)(h + 1), 3929 len - 4); 3930 addlog(">\n"); 3931 } 3932 break; 3933 } 3934 3935 if (debug) { 3936 log(LOG_DEBUG, 3937 "%s: chap input <%s id=0x%x len=%d name=", 3938 ifp->if_xname, 3939 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3940 ntohs(h->len)); 3941 sppp_print_string((char *) name, name_len); 3942 addlog(" value-size=%d value=", value_len); 3943 sppp_print_bytes(value, value_len); 3944 addlog(">\n"); 3945 } 3946 3947 /* Compute reply value. */ 3948 MD5Init(&ctx); 3949 MD5Update(&ctx, &h->ident, 1); 3950 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3951 MD5Update(&ctx, value, value_len); 3952 MD5Final(digest, &ctx); 3953 dsize = sizeof digest; 3954 3955 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3956 sizeof dsize, (const char *)&dsize, 3957 sizeof digest, digest, 3958 sp->myauth.name_len, 3959 sp->myauth.name, 3960 0); 3961 break; 3962 3963 case CHAP_SUCCESS: 3964 if (debug) { 3965 log(LOG_DEBUG, "%s: chap success", 3966 ifp->if_xname); 3967 if (len > 4) { 3968 addlog(": "); 3969 sppp_print_string((char *)(h + 1), len - 4); 3970 } 3971 addlog("\n"); 3972 } 3973 x = splnet(); 3974 sp->pp_auth_failures = 0; 3975 sp->pp_flags &= ~PP_NEEDAUTH; 3976 if (sp->myauth.proto == PPP_CHAP && 3977 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3978 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3979 /* 3980 * We are authenticator for CHAP but didn't 3981 * complete yet. Leave it to tlu to proceed 3982 * to network phase. 3983 */ 3984 splx(x); 3985 break; 3986 } 3987 splx(x); 3988 sppp_phase_network(sp); 3989 break; 3990 3991 case CHAP_FAILURE: 3992 x = splnet(); 3993 sp->pp_auth_failures++; 3994 splx(x); 3995 if (debug) { 3996 log(LOG_INFO, "%s: chap failure", 3997 ifp->if_xname); 3998 if (len > 4) { 3999 addlog(": "); 4000 sppp_print_string((char *)(h + 1), len - 4); 4001 } 4002 addlog("\n"); 4003 } else 4004 log(LOG_INFO, "%s: chap failure\n", 4005 ifp->if_xname); 4006 /* await LCP shutdown by authenticator */ 4007 break; 4008 4009 /* response is my authproto */ 4010 case CHAP_RESPONSE: 4011 if (sp->hisauth.secret == NULL) { 4012 /* can't do anything usefull */ 4013 printf("%s: chap input without his secret being set\n", 4014 ifp->if_xname); 4015 break; 4016 } 4017 value = 1 + (u_char *)(h + 1); 4018 value_len = value[-1]; 4019 name = value + value_len; 4020 name_len = len - value_len - 5; 4021 if (name_len < 0) { 4022 if (debug) { 4023 log(LOG_DEBUG, 4024 "%s: chap corrupted response " 4025 "<%s id=0x%x len=%d", 4026 ifp->if_xname, 4027 sppp_auth_type_name(PPP_CHAP, h->type), 4028 h->ident, ntohs(h->len)); 4029 if (len > 4) 4030 sppp_print_bytes((u_char *)(h + 1), 4031 len - 4); 4032 addlog(">\n"); 4033 } 4034 break; 4035 } 4036 if (h->ident != sp->confid[IDX_CHAP]) { 4037 if (debug) 4038 log(LOG_DEBUG, 4039 "%s: chap dropping response for old ID " 4040 "(got %d, expected %d)\n", 4041 ifp->if_xname, 4042 h->ident, sp->confid[IDX_CHAP]); 4043 break; 4044 } 4045 if (sp->hisauth.name != NULL && 4046 (name_len != sp->hisauth.name_len 4047 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4048 log(LOG_INFO, "%s: chap response, his name ", 4049 ifp->if_xname); 4050 sppp_print_string(name, name_len); 4051 addlog(" != expected "); 4052 sppp_print_string(sp->hisauth.name, 4053 sp->hisauth.name_len); 4054 addlog("\n"); 4055 goto chap_failure; 4056 } 4057 if (debug) { 4058 log(LOG_DEBUG, "%s: chap input(%s) " 4059 "<%s id=0x%x len=%d name=", 4060 ifp->if_xname, 4061 sppp_state_name(sp->state[IDX_CHAP]), 4062 sppp_auth_type_name(PPP_CHAP, h->type), 4063 h->ident, ntohs(h->len)); 4064 sppp_print_string((char *)name, name_len); 4065 addlog(" value-size=%d value=", value_len); 4066 sppp_print_bytes(value, value_len); 4067 addlog(">\n"); 4068 } 4069 if (value_len != sizeof(sp->myauth.challenge)) { 4070 if (debug) 4071 log(LOG_DEBUG, 4072 "%s: chap bad hash value length: " 4073 "%d bytes, should be %ld\n", 4074 ifp->if_xname, value_len, 4075 (long) sizeof(sp->myauth.challenge)); 4076 goto chap_failure; 4077 } 4078 4079 MD5Init(&ctx); 4080 MD5Update(&ctx, &h->ident, 1); 4081 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4082 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4083 MD5Final(digest, &ctx); 4084 4085 #define FAILMSG "Failed..." 4086 #define SUCCMSG "Welcome!" 4087 4088 if (value_len != sizeof digest || 4089 memcmp(digest, value, value_len) != 0) { 4090 chap_failure: 4091 /* action scn, tld */ 4092 x = splnet(); 4093 sp->pp_auth_failures++; 4094 splx(x); 4095 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4096 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4097 0); 4098 chap.tld(sp); 4099 break; 4100 } 4101 sp->pp_auth_failures = 0; 4102 /* action sca, perhaps tlu */ 4103 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4104 sp->state[IDX_CHAP] == STATE_OPENED) 4105 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4106 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4107 0); 4108 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4109 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4110 chap.tlu(sp); 4111 } 4112 break; 4113 4114 default: 4115 /* Unknown CHAP packet type -- ignore. */ 4116 if (debug) { 4117 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4118 "<0x%x id=0x%xh len=%d", 4119 ifp->if_xname, 4120 sppp_state_name(sp->state[IDX_CHAP]), 4121 h->type, h->ident, ntohs(h->len)); 4122 if (len > 4) 4123 sppp_print_bytes((u_char *)(h + 1), len - 4); 4124 addlog(">\n"); 4125 } 4126 break; 4127 4128 } 4129 } 4130 4131 static void 4132 sppp_chap_init(struct sppp *sp) 4133 { 4134 /* Chap doesn't have STATE_INITIAL at all. */ 4135 sp->state[IDX_CHAP] = STATE_CLOSED; 4136 sp->fail_counter[IDX_CHAP] = 0; 4137 sp->pp_seq[IDX_CHAP] = 0; 4138 sp->pp_rseq[IDX_CHAP] = 0; 4139 callout_init(&sp->ch[IDX_CHAP], 0); 4140 } 4141 4142 static void 4143 sppp_chap_open(struct sppp *sp) 4144 { 4145 if (sp->myauth.proto == PPP_CHAP && 4146 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4147 /* we are authenticator for CHAP, start it */ 4148 chap.scr(sp); 4149 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4150 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4151 } 4152 /* nothing to be done if we are peer, await a challenge */ 4153 } 4154 4155 static void 4156 sppp_chap_close(struct sppp *sp) 4157 { 4158 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4159 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4160 } 4161 4162 static void 4163 sppp_chap_TO(void *cookie) 4164 { 4165 struct sppp *sp = (struct sppp *)cookie; 4166 STDDCL; 4167 int s; 4168 4169 s = splnet(); 4170 if (debug) 4171 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4172 ifp->if_xname, 4173 sppp_state_name(sp->state[IDX_CHAP]), 4174 sp->rst_counter[IDX_CHAP]); 4175 4176 if (--sp->rst_counter[IDX_CHAP] < 0) 4177 /* TO- event */ 4178 switch (sp->state[IDX_CHAP]) { 4179 case STATE_REQ_SENT: 4180 chap.tld(sp); 4181 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4182 break; 4183 } 4184 else 4185 /* TO+ (or TO*) event */ 4186 switch (sp->state[IDX_CHAP]) { 4187 case STATE_OPENED: 4188 /* TO* event */ 4189 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4190 /* fall through */ 4191 case STATE_REQ_SENT: 4192 chap.scr(sp); 4193 /* sppp_cp_change_state() will restart the timer */ 4194 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4195 break; 4196 } 4197 4198 splx(s); 4199 } 4200 4201 static void 4202 sppp_chap_tlu(struct sppp *sp) 4203 { 4204 STDDCL; 4205 int i, x; 4206 4207 i = 0; 4208 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4209 4210 /* 4211 * Some broken CHAP implementations (Conware CoNet, firmware 4212 * 4.0.?) don't want to re-authenticate their CHAP once the 4213 * initial challenge-response exchange has taken place. 4214 * Provide for an option to avoid rechallenges. 4215 */ 4216 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4217 /* 4218 * Compute the re-challenge timeout. This will yield 4219 * a number between 300 and 810 seconds. 4220 */ 4221 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4222 4223 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4224 } 4225 4226 if (debug) { 4227 log(LOG_DEBUG, 4228 "%s: chap %s, ", 4229 ifp->if_xname, 4230 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4231 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4232 addlog("next re-challenge in %d seconds\n", i); 4233 else 4234 addlog("re-challenging supressed\n"); 4235 } 4236 4237 x = splnet(); 4238 sp->pp_auth_failures = 0; 4239 /* indicate to LCP that we need to be closed down */ 4240 sp->lcp.protos |= (1 << IDX_CHAP); 4241 4242 if (sp->pp_flags & PP_NEEDAUTH) { 4243 /* 4244 * Remote is authenticator, but his auth proto didn't 4245 * complete yet. Defer the transition to network 4246 * phase. 4247 */ 4248 splx(x); 4249 return; 4250 } 4251 splx(x); 4252 4253 /* 4254 * If we are already in phase network, we are done here. This 4255 * is the case if this is a dummy tlu event after a re-challenge. 4256 */ 4257 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4258 sppp_phase_network(sp); 4259 } 4260 4261 static void 4262 sppp_chap_tld(struct sppp *sp) 4263 { 4264 STDDCL; 4265 4266 if (debug) 4267 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4268 callout_stop(&sp->ch[IDX_CHAP]); 4269 sp->lcp.protos &= ~(1 << IDX_CHAP); 4270 4271 lcp.Close(sp); 4272 } 4273 4274 static void 4275 sppp_chap_scr(struct sppp *sp) 4276 { 4277 uint32_t *ch; 4278 u_char clen; 4279 4280 if (sp->myauth.name == NULL) { 4281 /* can't do anything usefull */ 4282 printf("%s: chap starting without my name being set\n", 4283 sp->pp_if.if_xname); 4284 return; 4285 } 4286 4287 /* Compute random challenge. */ 4288 ch = (uint32_t *)sp->myauth.challenge; 4289 ch[0] = arc4random(); 4290 ch[1] = arc4random(); 4291 ch[2] = arc4random(); 4292 ch[3] = arc4random(); 4293 clen = 16; /* 4 * sizeof(uint32_t) */ 4294 4295 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4296 4297 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4298 sizeof clen, (const char *)&clen, 4299 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4300 sp->myauth.name_len, 4301 sp->myauth.name, 4302 0); 4303 } 4304 4305 /* 4306 *--------------------------------------------------------------------------* 4307 * * 4308 * The PAP implementation. * 4309 * * 4310 *--------------------------------------------------------------------------* 4311 */ 4312 /* 4313 * For PAP, we need to keep a little state also if we are the peer, not the 4314 * authenticator. This is since we don't get a request to authenticate, but 4315 * have to repeatedly authenticate ourself until we got a response (or the 4316 * retry counter is expired). 4317 */ 4318 4319 /* 4320 * Handle incoming PAP packets. */ 4321 static void 4322 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4323 { 4324 STDDCL; 4325 struct lcp_header *h; 4326 int len, x; 4327 u_char mlen; 4328 char *name, *secret; 4329 int name_len, secret_len; 4330 4331 /* 4332 * Malicious input might leave this uninitialized, so 4333 * init to an impossible value. 4334 */ 4335 secret_len = -1; 4336 4337 len = m->m_pkthdr.len; 4338 if (len < 5) { 4339 if (debug) 4340 log(LOG_DEBUG, 4341 "%s: pap invalid packet length: %d bytes\n", 4342 ifp->if_xname, len); 4343 return; 4344 } 4345 h = mtod(m, struct lcp_header *); 4346 if (len > ntohs(h->len)) 4347 len = ntohs(h->len); 4348 switch (h->type) { 4349 /* PAP request is my authproto */ 4350 case PAP_REQ: 4351 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4352 /* can't do anything usefull */ 4353 printf("%s: pap request without his name and his secret being set\n", 4354 ifp->if_xname); 4355 break; 4356 } 4357 name = 1 + (u_char *)(h + 1); 4358 name_len = name[-1]; 4359 secret = name + name_len + 1; 4360 if (name_len > len - 6 || 4361 (secret_len = secret[-1]) > len - 6 - name_len) { 4362 if (debug) { 4363 log(LOG_DEBUG, "%s: pap corrupted input " 4364 "<%s id=0x%x len=%d", 4365 ifp->if_xname, 4366 sppp_auth_type_name(PPP_PAP, h->type), 4367 h->ident, ntohs(h->len)); 4368 if (len > 4) 4369 sppp_print_bytes((u_char *)(h + 1), 4370 len - 4); 4371 addlog(">\n"); 4372 } 4373 break; 4374 } 4375 if (debug) { 4376 log(LOG_DEBUG, "%s: pap input(%s) " 4377 "<%s id=0x%x len=%d name=", 4378 ifp->if_xname, 4379 sppp_state_name(sp->state[IDX_PAP]), 4380 sppp_auth_type_name(PPP_PAP, h->type), 4381 h->ident, ntohs(h->len)); 4382 sppp_print_string((char *)name, name_len); 4383 addlog(" secret="); 4384 sppp_print_string((char *)secret, secret_len); 4385 addlog(">\n"); 4386 } 4387 if (name_len != sp->hisauth.name_len || 4388 secret_len != sp->hisauth.secret_len || 4389 memcmp(name, sp->hisauth.name, name_len) != 0 || 4390 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4391 /* action scn, tld */ 4392 sp->pp_auth_failures++; 4393 mlen = sizeof(FAILMSG) - 1; 4394 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4395 sizeof mlen, (const char *)&mlen, 4396 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4397 0); 4398 pap.tld(sp); 4399 break; 4400 } 4401 /* action sca, perhaps tlu */ 4402 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4403 sp->state[IDX_PAP] == STATE_OPENED) { 4404 mlen = sizeof(SUCCMSG) - 1; 4405 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4406 sizeof mlen, (const char *)&mlen, 4407 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4408 0); 4409 } 4410 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4411 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4412 pap.tlu(sp); 4413 } 4414 break; 4415 4416 /* ack and nak are his authproto */ 4417 case PAP_ACK: 4418 callout_stop(&sp->pap_my_to_ch); 4419 if (debug) { 4420 log(LOG_DEBUG, "%s: pap success", 4421 ifp->if_xname); 4422 name = 1 + (u_char *)(h + 1); 4423 name_len = name[-1]; 4424 if (len > 5 && name_len < len+4) { 4425 addlog(": "); 4426 sppp_print_string(name, name_len); 4427 } 4428 addlog("\n"); 4429 } 4430 x = splnet(); 4431 sp->pp_auth_failures = 0; 4432 sp->pp_flags &= ~PP_NEEDAUTH; 4433 if (sp->myauth.proto == PPP_PAP && 4434 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4435 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4436 /* 4437 * We are authenticator for PAP but didn't 4438 * complete yet. Leave it to tlu to proceed 4439 * to network phase. 4440 */ 4441 splx(x); 4442 break; 4443 } 4444 splx(x); 4445 sppp_phase_network(sp); 4446 break; 4447 4448 case PAP_NAK: 4449 callout_stop(&sp->pap_my_to_ch); 4450 sp->pp_auth_failures++; 4451 if (debug) { 4452 log(LOG_INFO, "%s: pap failure", 4453 ifp->if_xname); 4454 name = 1 + (u_char *)(h + 1); 4455 name_len = name[-1]; 4456 if (len > 5 && name_len < len+4) { 4457 addlog(": "); 4458 sppp_print_string(name, name_len); 4459 } 4460 addlog("\n"); 4461 } else 4462 log(LOG_INFO, "%s: pap failure\n", 4463 ifp->if_xname); 4464 /* await LCP shutdown by authenticator */ 4465 break; 4466 4467 default: 4468 /* Unknown PAP packet type -- ignore. */ 4469 if (debug) { 4470 log(LOG_DEBUG, "%s: pap corrupted input " 4471 "<0x%x id=0x%x len=%d", 4472 ifp->if_xname, 4473 h->type, h->ident, ntohs(h->len)); 4474 if (len > 4) 4475 sppp_print_bytes((u_char *)(h + 1), len - 4); 4476 addlog(">\n"); 4477 } 4478 break; 4479 4480 } 4481 } 4482 4483 static void 4484 sppp_pap_init(struct sppp *sp) 4485 { 4486 /* PAP doesn't have STATE_INITIAL at all. */ 4487 sp->state[IDX_PAP] = STATE_CLOSED; 4488 sp->fail_counter[IDX_PAP] = 0; 4489 sp->pp_seq[IDX_PAP] = 0; 4490 sp->pp_rseq[IDX_PAP] = 0; 4491 callout_init(&sp->ch[IDX_PAP], 0); 4492 callout_init(&sp->pap_my_to_ch, 0); 4493 } 4494 4495 static void 4496 sppp_pap_open(struct sppp *sp) 4497 { 4498 if (sp->hisauth.proto == PPP_PAP && 4499 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4500 /* we are authenticator for PAP, start our timer */ 4501 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4502 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4503 } 4504 if (sp->myauth.proto == PPP_PAP) { 4505 /* we are peer, send a request, and start a timer */ 4506 pap.scr(sp); 4507 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4508 sppp_pap_my_TO, sp); 4509 } 4510 } 4511 4512 static void 4513 sppp_pap_close(struct sppp *sp) 4514 { 4515 if (sp->state[IDX_PAP] != STATE_CLOSED) 4516 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4517 } 4518 4519 /* 4520 * That's the timeout routine if we are authenticator. Since the 4521 * authenticator is basically passive in PAP, we can't do much here. 4522 */ 4523 static void 4524 sppp_pap_TO(void *cookie) 4525 { 4526 struct sppp *sp = (struct sppp *)cookie; 4527 STDDCL; 4528 int s; 4529 4530 s = splnet(); 4531 if (debug) 4532 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4533 ifp->if_xname, 4534 sppp_state_name(sp->state[IDX_PAP]), 4535 sp->rst_counter[IDX_PAP]); 4536 4537 if (--sp->rst_counter[IDX_PAP] < 0) 4538 /* TO- event */ 4539 switch (sp->state[IDX_PAP]) { 4540 case STATE_REQ_SENT: 4541 pap.tld(sp); 4542 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4543 break; 4544 } 4545 else 4546 /* TO+ event, not very much we could do */ 4547 switch (sp->state[IDX_PAP]) { 4548 case STATE_REQ_SENT: 4549 /* sppp_cp_change_state() will restart the timer */ 4550 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4551 break; 4552 } 4553 4554 splx(s); 4555 } 4556 4557 /* 4558 * That's the timeout handler if we are peer. Since the peer is active, 4559 * we need to retransmit our PAP request since it is apparently lost. 4560 * XXX We should impose a max counter. 4561 */ 4562 static void 4563 sppp_pap_my_TO(void *cookie) 4564 { 4565 struct sppp *sp = (struct sppp *)cookie; 4566 STDDCL; 4567 4568 if (debug) 4569 log(LOG_DEBUG, "%s: pap peer TO\n", 4570 ifp->if_xname); 4571 4572 pap.scr(sp); 4573 } 4574 4575 static void 4576 sppp_pap_tlu(struct sppp *sp) 4577 { 4578 STDDCL; 4579 int x; 4580 4581 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4582 4583 if (debug) 4584 log(LOG_DEBUG, "%s: %s tlu\n", 4585 ifp->if_xname, pap.name); 4586 4587 x = splnet(); 4588 sp->pp_auth_failures = 0; 4589 /* indicate to LCP that we need to be closed down */ 4590 sp->lcp.protos |= (1 << IDX_PAP); 4591 4592 if (sp->pp_flags & PP_NEEDAUTH) { 4593 /* 4594 * Remote is authenticator, but his auth proto didn't 4595 * complete yet. Defer the transition to network 4596 * phase. 4597 */ 4598 splx(x); 4599 return; 4600 } 4601 splx(x); 4602 sppp_phase_network(sp); 4603 } 4604 4605 static void 4606 sppp_pap_tld(struct sppp *sp) 4607 { 4608 STDDCL; 4609 4610 if (debug) 4611 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4612 callout_stop(&sp->ch[IDX_PAP]); 4613 callout_stop(&sp->pap_my_to_ch); 4614 sp->lcp.protos &= ~(1 << IDX_PAP); 4615 4616 lcp.Close(sp); 4617 } 4618 4619 static void 4620 sppp_pap_scr(struct sppp *sp) 4621 { 4622 u_char idlen, pwdlen; 4623 4624 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4625 /* can't do anything usefull */ 4626 printf("%s: pap starting without my name and secret being set\n", 4627 sp->pp_if.if_xname); 4628 return; 4629 } 4630 4631 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4632 pwdlen = sp->myauth.secret_len; 4633 idlen = sp->myauth.name_len; 4634 4635 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4636 sizeof idlen, (const char *)&idlen, 4637 idlen, sp->myauth.name, 4638 sizeof pwdlen, (const char *)&pwdlen, 4639 pwdlen, sp->myauth.secret, 4640 0); 4641 } 4642 4643 /* 4644 * Random miscellaneous functions. 4645 */ 4646 4647 /* 4648 * Send a PAP or CHAP proto packet. 4649 * 4650 * Varadic function, each of the elements for the ellipsis is of type 4651 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4652 * mlen == 0. 4653 * NOTE: never declare variadic functions with types subject to type 4654 * promotion (i.e. u_char). This is asking for big trouble depending 4655 * on the architecture you are on... 4656 */ 4657 4658 static void 4659 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4660 unsigned int type, unsigned int id, 4661 ...) 4662 { 4663 STDDCL; 4664 struct lcp_header *lh; 4665 struct mbuf *m; 4666 u_char *p; 4667 int len; 4668 size_t pkthdrlen; 4669 unsigned int mlen; 4670 const char *msg; 4671 va_list ap; 4672 4673 MGETHDR(m, M_DONTWAIT, MT_DATA); 4674 if (! m) 4675 return; 4676 m->m_pkthdr.rcvif = 0; 4677 4678 if (sp->pp_flags & PP_NOFRAMING) { 4679 *mtod(m, uint16_t *) = htons(cp->proto); 4680 pkthdrlen = 2; 4681 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4682 } else { 4683 struct ppp_header *h; 4684 h = mtod(m, struct ppp_header *); 4685 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4686 h->control = PPP_UI; /* Unnumbered Info */ 4687 h->protocol = htons(cp->proto); 4688 pkthdrlen = PPP_HEADER_LEN; 4689 4690 lh = (struct lcp_header *)(h + 1); 4691 } 4692 4693 lh->type = type; 4694 lh->ident = id; 4695 p = (u_char *)(lh + 1); 4696 4697 va_start(ap, id); 4698 len = 0; 4699 4700 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4701 msg = va_arg(ap, const char *); 4702 len += mlen; 4703 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4704 va_end(ap); 4705 m_freem(m); 4706 return; 4707 } 4708 4709 memcpy(p, msg, mlen); 4710 p += mlen; 4711 } 4712 va_end(ap); 4713 4714 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4715 lh->len = htons(LCP_HEADER_LEN + len); 4716 4717 if (debug) { 4718 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4719 ifp->if_xname, cp->name, 4720 sppp_auth_type_name(cp->proto, lh->type), 4721 lh->ident, ntohs(lh->len)); 4722 if (len) 4723 sppp_print_bytes((u_char *)(lh + 1), len); 4724 addlog(">\n"); 4725 } 4726 if (IF_QFULL(&sp->pp_cpq)) { 4727 IF_DROP(&sp->pp_fastq); 4728 IF_DROP(&ifp->if_snd); 4729 m_freem(m); 4730 ++ifp->if_oerrors; 4731 return; 4732 } else 4733 IF_ENQUEUE(&sp->pp_cpq, m); 4734 if (! (ifp->if_flags & IFF_OACTIVE)) 4735 (*ifp->if_start)(ifp); 4736 ifp->if_obytes += m->m_pkthdr.len + 3; 4737 } 4738 4739 /* 4740 * Send keepalive packets, every 10 seconds. 4741 */ 4742 static void 4743 sppp_keepalive(void *dummy) 4744 { 4745 struct sppp *sp; 4746 int s; 4747 time_t now; 4748 4749 s = splnet(); 4750 now = time_uptime; 4751 for (sp=spppq; sp; sp=sp->pp_next) { 4752 struct ifnet *ifp = &sp->pp_if; 4753 4754 /* check idle timeout */ 4755 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4756 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4757 /* idle timeout is enabled for this interface */ 4758 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4759 if (ifp->if_flags & IFF_DEBUG) 4760 printf("%s: no activity for %lu seconds\n", 4761 sp->pp_if.if_xname, 4762 (unsigned long)(now-sp->pp_last_activity)); 4763 lcp.Close(sp); 4764 continue; 4765 } 4766 } 4767 4768 /* Keepalive mode disabled or channel down? */ 4769 if (! (sp->pp_flags & PP_KEEPALIVE) || 4770 ! (ifp->if_flags & IFF_RUNNING)) 4771 continue; 4772 4773 /* No keepalive in PPP mode if LCP not opened yet. */ 4774 if (! (sp->pp_flags & PP_CISCO) && 4775 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4776 continue; 4777 4778 /* No echo reply, but maybe user data passed through? */ 4779 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4780 sp->pp_alivecnt = 0; 4781 continue; 4782 } 4783 4784 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4785 /* No keepalive packets got. Stop the interface. */ 4786 if_down (ifp); 4787 IF_PURGE(&sp->pp_cpq); 4788 if (! (sp->pp_flags & PP_CISCO)) { 4789 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4790 ifp->if_xname); 4791 sp->pp_alivecnt = 0; 4792 4793 /* we are down, close all open protocols */ 4794 lcp.Close(sp); 4795 4796 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4797 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4798 4799 /* Close connection immediately, completition of this 4800 * will summon the magic needed to reestablish it. */ 4801 if (sp->pp_tlf) 4802 sp->pp_tlf(sp); 4803 continue; 4804 } 4805 } 4806 if (sp->pp_alivecnt < sp->pp_maxalive) 4807 ++sp->pp_alivecnt; 4808 if (sp->pp_flags & PP_CISCO) 4809 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4810 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4811 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4812 int32_t nmagic = htonl(sp->lcp.magic); 4813 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4814 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4815 sp->lcp.echoid, 4, &nmagic); 4816 } 4817 } 4818 splx(s); 4819 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4820 } 4821 4822 #ifdef INET 4823 /* 4824 * Get both IP addresses. 4825 */ 4826 static void 4827 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4828 { 4829 struct ifnet *ifp = &sp->pp_if; 4830 struct ifaddr *ifa; 4831 struct sockaddr_in *si, *sm; 4832 uint32_t ssrc, ddst; 4833 4834 sm = NULL; 4835 ssrc = ddst = 0; 4836 /* 4837 * Pick the first AF_INET address from the list, 4838 * aliases don't make any sense on a p2p link anyway. 4839 */ 4840 si = 0; 4841 IFADDR_FOREACH(ifa, ifp) { 4842 if (ifa->ifa_addr->sa_family == AF_INET) { 4843 si = (struct sockaddr_in *)ifa->ifa_addr; 4844 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4845 if (si) 4846 break; 4847 } 4848 } 4849 if (ifa) { 4850 if (si && si->sin_addr.s_addr) { 4851 ssrc = si->sin_addr.s_addr; 4852 if (srcmask) 4853 *srcmask = ntohl(sm->sin_addr.s_addr); 4854 } 4855 4856 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4857 if (si && si->sin_addr.s_addr) 4858 ddst = si->sin_addr.s_addr; 4859 } 4860 4861 if (dst) *dst = ntohl(ddst); 4862 if (src) *src = ntohl(ssrc); 4863 } 4864 4865 /* 4866 * Set IP addresses. Must be called at splnet. 4867 * If an address is 0, leave it the way it is. 4868 */ 4869 static void 4870 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4871 { 4872 STDDCL; 4873 struct ifaddr *ifa; 4874 struct sockaddr_in *si, *dest; 4875 4876 /* 4877 * Pick the first AF_INET address from the list, 4878 * aliases don't make any sense on a p2p link anyway. 4879 */ 4880 4881 IFADDR_FOREACH(ifa, ifp) { 4882 if (ifa->ifa_addr->sa_family == AF_INET) { 4883 si = (struct sockaddr_in *)ifa->ifa_addr; 4884 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4885 goto found; 4886 } 4887 } 4888 return; 4889 4890 found: 4891 { 4892 int error; 4893 struct sockaddr_in new_sin = *si; 4894 struct sockaddr_in new_dst = *dest; 4895 4896 /* 4897 * Scrub old routes now instead of calling in_ifinit with 4898 * scrub=1, because we may change the dstaddr 4899 * before the call to in_ifinit. 4900 */ 4901 in_ifscrub(ifp, ifatoia(ifa)); 4902 4903 if (myaddr != 0) 4904 new_sin.sin_addr.s_addr = htonl(myaddr); 4905 if (hisaddr != 0) { 4906 new_dst.sin_addr.s_addr = htonl(hisaddr); 4907 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4908 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4909 *dest = new_dst; /* fix dstaddr in place */ 4910 } 4911 } 4912 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4913 if (debug && error) 4914 { 4915 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4916 " failed, error=%d\n", ifp->if_xname, error); 4917 } 4918 #ifdef PFIL_HOOKS 4919 if (!error) 4920 (void)pfil_run_hooks(&if_pfil, 4921 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4922 #endif 4923 } 4924 } 4925 4926 /* 4927 * Clear IP addresses. Must be called at splnet. 4928 */ 4929 static void 4930 sppp_clear_ip_addrs(struct sppp *sp) 4931 { 4932 struct ifnet *ifp = &sp->pp_if; 4933 struct ifaddr *ifa; 4934 struct sockaddr_in *si, *dest; 4935 4936 uint32_t remote; 4937 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4938 remote = sp->ipcp.saved_hisaddr; 4939 else 4940 sppp_get_ip_addrs(sp, 0, &remote, 0); 4941 4942 /* 4943 * Pick the first AF_INET address from the list, 4944 * aliases don't make any sense on a p2p link anyway. 4945 */ 4946 4947 IFADDR_FOREACH(ifa, ifp) { 4948 if (ifa->ifa_addr->sa_family == AF_INET) { 4949 si = (struct sockaddr_in *)ifa->ifa_addr; 4950 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4951 goto found; 4952 } 4953 } 4954 return; 4955 4956 found: 4957 { 4958 struct sockaddr_in new_sin = *si; 4959 4960 in_ifscrub(ifp, ifatoia(ifa)); 4961 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4962 new_sin.sin_addr.s_addr = 0; 4963 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4964 /* replace peer addr in place */ 4965 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4966 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4967 #ifdef PFIL_HOOKS 4968 (void)pfil_run_hooks(&if_pfil, 4969 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4970 #endif 4971 } 4972 } 4973 #endif 4974 4975 #ifdef INET6 4976 /* 4977 * Get both IPv6 addresses. 4978 */ 4979 static void 4980 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4981 struct in6_addr *srcmask) 4982 { 4983 struct ifnet *ifp = &sp->pp_if; 4984 struct ifaddr *ifa; 4985 struct sockaddr_in6 *si, *sm; 4986 struct in6_addr ssrc, ddst; 4987 4988 sm = NULL; 4989 memset(&ssrc, 0, sizeof(ssrc)); 4990 memset(&ddst, 0, sizeof(ddst)); 4991 /* 4992 * Pick the first link-local AF_INET6 address from the list, 4993 * aliases don't make any sense on a p2p link anyway. 4994 */ 4995 si = 0; 4996 IFADDR_FOREACH(ifa, ifp) 4997 if (ifa->ifa_addr->sa_family == AF_INET6) { 4998 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4999 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5000 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5001 break; 5002 } 5003 if (ifa) { 5004 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5005 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5006 if (srcmask) { 5007 memcpy(srcmask, &sm->sin6_addr, 5008 sizeof(*srcmask)); 5009 } 5010 } 5011 5012 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5013 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5014 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5015 } 5016 5017 if (dst) 5018 memcpy(dst, &ddst, sizeof(*dst)); 5019 if (src) 5020 memcpy(src, &ssrc, sizeof(*src)); 5021 } 5022 5023 #ifdef IPV6CP_MYIFID_DYN 5024 /* 5025 * Generate random ifid. 5026 */ 5027 static void 5028 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5029 { 5030 /* TBD */ 5031 } 5032 5033 /* 5034 * Set my IPv6 address. Must be called at splnet. 5035 */ 5036 static void 5037 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5038 { 5039 STDDCL; 5040 struct ifaddr *ifa; 5041 struct sockaddr_in6 *sin6; 5042 5043 /* 5044 * Pick the first link-local AF_INET6 address from the list, 5045 * aliases don't make any sense on a p2p link anyway. 5046 */ 5047 5048 sin6 = NULL; 5049 IFADDR_FOREACH(ifa, ifp) 5050 { 5051 if (ifa->ifa_addr->sa_family == AF_INET6) 5052 { 5053 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5054 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5055 break; 5056 } 5057 } 5058 5059 if (ifa && sin6) 5060 { 5061 int error; 5062 struct sockaddr_in6 new_sin6 = *sin6; 5063 5064 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5065 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5066 if (debug && error) 5067 { 5068 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5069 " failed, error=%d\n", ifp->if_xname, error); 5070 } 5071 #ifdef PFIL_HOOKS 5072 if (!error) 5073 (void)pfil_run_hooks(&if_pfil, 5074 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5075 #endif 5076 } 5077 } 5078 #endif 5079 5080 /* 5081 * Suggest a candidate address to be used by peer. 5082 */ 5083 static void 5084 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5085 { 5086 struct in6_addr myaddr; 5087 struct timeval tv; 5088 5089 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5090 5091 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5092 microtime(&tv); 5093 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5094 myaddr.s6_addr[14] ^= 0xff; 5095 myaddr.s6_addr[15] ^= 0xff; 5096 } else { 5097 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5098 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5099 } 5100 if (suggest) 5101 memcpy(suggest, &myaddr, sizeof(myaddr)); 5102 } 5103 #endif /*INET6*/ 5104 5105 /* 5106 * Process ioctl requests specific to the PPP interface. 5107 * Permissions have already been checked. 5108 */ 5109 static int 5110 sppp_params(struct sppp *sp, u_long cmd, void *data) 5111 { 5112 switch (cmd) { 5113 case SPPPGETAUTHCFG: 5114 { 5115 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5116 int error; 5117 size_t len; 5118 5119 cfg->myauthflags = sp->myauth.flags; 5120 cfg->hisauthflags = sp->hisauth.flags; 5121 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5122 cfg->hisauth = 0; 5123 if (sp->hisauth.proto) 5124 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5125 cfg->myauth = 0; 5126 if (sp->myauth.proto) 5127 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5128 if (cfg->myname_length == 0) { 5129 if (sp->myauth.name != NULL) 5130 cfg->myname_length = sp->myauth.name_len + 1; 5131 } else { 5132 if (sp->myauth.name == NULL) { 5133 cfg->myname_length = 0; 5134 } else { 5135 len = sp->myauth.name_len + 1; 5136 if (cfg->myname_length < len) 5137 return (ENAMETOOLONG); 5138 error = copyout(sp->myauth.name, cfg->myname, len); 5139 if (error) return error; 5140 } 5141 } 5142 if (cfg->hisname_length == 0) { 5143 if (sp->hisauth.name != NULL) 5144 cfg->hisname_length = sp->hisauth.name_len + 1; 5145 } else { 5146 if (sp->hisauth.name == NULL) { 5147 cfg->hisname_length = 0; 5148 } else { 5149 len = sp->hisauth.name_len + 1; 5150 if (cfg->hisname_length < len) 5151 return (ENAMETOOLONG); 5152 error = copyout(sp->hisauth.name, cfg->hisname, len); 5153 if (error) return error; 5154 } 5155 } 5156 } 5157 break; 5158 case SPPPSETAUTHCFG: 5159 { 5160 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5161 int error; 5162 5163 if (sp->myauth.name) { 5164 free(sp->myauth.name, M_DEVBUF); 5165 sp->myauth.name = NULL; 5166 } 5167 if (sp->myauth.secret) { 5168 free(sp->myauth.secret, M_DEVBUF); 5169 sp->myauth.secret = NULL; 5170 } 5171 if (sp->hisauth.name) { 5172 free(sp->hisauth.name, M_DEVBUF); 5173 sp->hisauth.name = NULL; 5174 } 5175 if (sp->hisauth.secret) { 5176 free(sp->hisauth.secret, M_DEVBUF); 5177 sp->hisauth.secret = NULL; 5178 } 5179 5180 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5181 if (cfg->hisname_length >= MCLBYTES) 5182 return (ENAMETOOLONG); 5183 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5184 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5185 if (error) { 5186 free(sp->hisauth.name, M_DEVBUF); 5187 sp->hisauth.name = NULL; 5188 return error; 5189 } 5190 sp->hisauth.name_len = cfg->hisname_length - 1; 5191 sp->hisauth.name[sp->hisauth.name_len] = 0; 5192 } 5193 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5194 if (cfg->hissecret_length >= MCLBYTES) 5195 return (ENAMETOOLONG); 5196 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5197 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5198 if (error) { 5199 free(sp->hisauth.secret, M_DEVBUF); 5200 sp->hisauth.secret = NULL; 5201 return error; 5202 } 5203 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5204 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5205 } 5206 if (cfg->myname != NULL && cfg->myname_length > 0) { 5207 if (cfg->myname_length >= MCLBYTES) 5208 return (ENAMETOOLONG); 5209 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5210 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5211 if (error) { 5212 free(sp->myauth.name, M_DEVBUF); 5213 sp->myauth.name = NULL; 5214 return error; 5215 } 5216 sp->myauth.name_len = cfg->myname_length - 1; 5217 sp->myauth.name[sp->myauth.name_len] = 0; 5218 } 5219 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5220 if (cfg->mysecret_length >= MCLBYTES) 5221 return (ENAMETOOLONG); 5222 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5223 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5224 if (error) { 5225 free(sp->myauth.secret, M_DEVBUF); 5226 sp->myauth.secret = NULL; 5227 return error; 5228 } 5229 sp->myauth.secret_len = cfg->mysecret_length - 1; 5230 sp->myauth.secret[sp->myauth.secret_len] = 0; 5231 } 5232 sp->myauth.flags = cfg->myauthflags; 5233 if (cfg->myauth) 5234 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5235 sp->hisauth.flags = cfg->hisauthflags; 5236 if (cfg->hisauth) 5237 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5238 sp->pp_auth_failures = 0; 5239 if (sp->hisauth.proto != 0) 5240 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5241 else 5242 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5243 } 5244 break; 5245 case SPPPGETLCPCFG: 5246 { 5247 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5248 lcpp->lcp_timeout = sp->lcp.timeout; 5249 } 5250 break; 5251 case SPPPSETLCPCFG: 5252 { 5253 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5254 sp->lcp.timeout = lcpp->lcp_timeout; 5255 } 5256 break; 5257 case SPPPGETSTATUS: 5258 { 5259 struct spppstatus *status = (struct spppstatus *)data; 5260 status->phase = sp->pp_phase; 5261 } 5262 break; 5263 case SPPPGETSTATUSNCP: 5264 { 5265 struct spppstatusncp *status = (struct spppstatusncp *)data; 5266 status->phase = sp->pp_phase; 5267 status->ncpup = sppp_ncp_check(sp); 5268 } 5269 break; 5270 case SPPPGETIDLETO: 5271 { 5272 struct spppidletimeout *to = (struct spppidletimeout *)data; 5273 to->idle_seconds = sp->pp_idle_timeout; 5274 } 5275 break; 5276 case SPPPSETIDLETO: 5277 { 5278 struct spppidletimeout *to = (struct spppidletimeout *)data; 5279 sp->pp_idle_timeout = to->idle_seconds; 5280 } 5281 break; 5282 case SPPPSETAUTHFAILURE: 5283 { 5284 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5285 sp->pp_max_auth_fail = afsettings->max_failures; 5286 sp->pp_auth_failures = 0; 5287 } 5288 break; 5289 case SPPPGETAUTHFAILURES: 5290 { 5291 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5292 stats->auth_failures = sp->pp_auth_failures; 5293 stats->max_failures = sp->pp_max_auth_fail; 5294 } 5295 break; 5296 case SPPPSETDNSOPTS: 5297 { 5298 struct spppdnssettings *req = (struct spppdnssettings *)data; 5299 sp->query_dns = req->query_dns & 3; 5300 } 5301 break; 5302 case SPPPGETDNSOPTS: 5303 { 5304 struct spppdnssettings *req = (struct spppdnssettings *)data; 5305 req->query_dns = sp->query_dns; 5306 } 5307 break; 5308 case SPPPGETDNSADDRS: 5309 { 5310 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5311 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5312 } 5313 break; 5314 case SPPPGETKEEPALIVE: 5315 { 5316 struct spppkeepalivesettings *settings = 5317 (struct spppkeepalivesettings*)data; 5318 settings->maxalive = sp->pp_maxalive; 5319 settings->max_noreceive = sp->pp_max_noreceive; 5320 } 5321 break; 5322 case SPPPSETKEEPALIVE: 5323 { 5324 struct spppkeepalivesettings *settings = 5325 (struct spppkeepalivesettings*)data; 5326 sp->pp_maxalive = settings->maxalive; 5327 sp->pp_max_noreceive = settings->max_noreceive; 5328 } 5329 break; 5330 default: 5331 return (EINVAL); 5332 } 5333 5334 return (0); 5335 } 5336 5337 static void 5338 sppp_phase_network(struct sppp *sp) 5339 { 5340 STDDCL; 5341 int i; 5342 uint32_t mask; 5343 5344 sp->pp_phase = SPPP_PHASE_NETWORK; 5345 5346 if (debug) 5347 { 5348 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5349 sppp_phase_name(sp->pp_phase)); 5350 } 5351 5352 /* Notify NCPs now. */ 5353 for (i = 0; i < IDX_COUNT; i++) 5354 if ((cps[i])->flags & CP_NCP) 5355 (cps[i])->Open(sp); 5356 5357 /* Send Up events to all NCPs. */ 5358 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5359 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5360 (cps[i])->Up(sp); 5361 5362 /* if no NCP is starting, all this was in vain, close down */ 5363 sppp_lcp_check_and_close(sp); 5364 } 5365 5366 5367 static const char * 5368 sppp_cp_type_name(u_char type) 5369 { 5370 static char buf[12]; 5371 switch (type) { 5372 case CONF_REQ: return "conf-req"; 5373 case CONF_ACK: return "conf-ack"; 5374 case CONF_NAK: return "conf-nak"; 5375 case CONF_REJ: return "conf-rej"; 5376 case TERM_REQ: return "term-req"; 5377 case TERM_ACK: return "term-ack"; 5378 case CODE_REJ: return "code-rej"; 5379 case PROTO_REJ: return "proto-rej"; 5380 case ECHO_REQ: return "echo-req"; 5381 case ECHO_REPLY: return "echo-reply"; 5382 case DISC_REQ: return "discard-req"; 5383 } 5384 snprintf(buf, sizeof(buf), "0x%x", type); 5385 return buf; 5386 } 5387 5388 static const char * 5389 sppp_auth_type_name(u_short proto, u_char type) 5390 { 5391 static char buf[12]; 5392 switch (proto) { 5393 case PPP_CHAP: 5394 switch (type) { 5395 case CHAP_CHALLENGE: return "challenge"; 5396 case CHAP_RESPONSE: return "response"; 5397 case CHAP_SUCCESS: return "success"; 5398 case CHAP_FAILURE: return "failure"; 5399 } 5400 case PPP_PAP: 5401 switch (type) { 5402 case PAP_REQ: return "req"; 5403 case PAP_ACK: return "ack"; 5404 case PAP_NAK: return "nak"; 5405 } 5406 } 5407 snprintf(buf, sizeof(buf), "0x%x", type); 5408 return buf; 5409 } 5410 5411 static const char * 5412 sppp_lcp_opt_name(u_char opt) 5413 { 5414 static char buf[12]; 5415 switch (opt) { 5416 case LCP_OPT_MRU: return "mru"; 5417 case LCP_OPT_ASYNC_MAP: return "async-map"; 5418 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5419 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5420 case LCP_OPT_MAGIC: return "magic"; 5421 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5422 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5423 } 5424 snprintf(buf, sizeof(buf), "0x%x", opt); 5425 return buf; 5426 } 5427 5428 static const char * 5429 sppp_ipcp_opt_name(u_char opt) 5430 { 5431 static char buf[12]; 5432 switch (opt) { 5433 case IPCP_OPT_ADDRESSES: return "addresses"; 5434 case IPCP_OPT_COMPRESSION: return "compression"; 5435 case IPCP_OPT_ADDRESS: return "address"; 5436 } 5437 snprintf(buf, sizeof(buf), "0x%x", opt); 5438 return buf; 5439 } 5440 5441 #ifdef INET6 5442 static const char * 5443 sppp_ipv6cp_opt_name(u_char opt) 5444 { 5445 static char buf[12]; 5446 switch (opt) { 5447 case IPV6CP_OPT_IFID: return "ifid"; 5448 case IPV6CP_OPT_COMPRESSION: return "compression"; 5449 } 5450 snprintf(buf, sizeof(buf), "0x%x", opt); 5451 return buf; 5452 } 5453 #endif 5454 5455 static const char * 5456 sppp_state_name(int state) 5457 { 5458 switch (state) { 5459 case STATE_INITIAL: return "initial"; 5460 case STATE_STARTING: return "starting"; 5461 case STATE_CLOSED: return "closed"; 5462 case STATE_STOPPED: return "stopped"; 5463 case STATE_CLOSING: return "closing"; 5464 case STATE_STOPPING: return "stopping"; 5465 case STATE_REQ_SENT: return "req-sent"; 5466 case STATE_ACK_RCVD: return "ack-rcvd"; 5467 case STATE_ACK_SENT: return "ack-sent"; 5468 case STATE_OPENED: return "opened"; 5469 } 5470 return "illegal"; 5471 } 5472 5473 static const char * 5474 sppp_phase_name(int phase) 5475 { 5476 switch (phase) { 5477 case SPPP_PHASE_DEAD: return "dead"; 5478 case SPPP_PHASE_ESTABLISH: return "establish"; 5479 case SPPP_PHASE_TERMINATE: return "terminate"; 5480 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5481 case SPPP_PHASE_NETWORK: return "network"; 5482 } 5483 return "illegal"; 5484 } 5485 5486 static const char * 5487 sppp_proto_name(u_short proto) 5488 { 5489 static char buf[12]; 5490 switch (proto) { 5491 case PPP_LCP: return "lcp"; 5492 case PPP_IPCP: return "ipcp"; 5493 case PPP_PAP: return "pap"; 5494 case PPP_CHAP: return "chap"; 5495 case PPP_IPV6CP: return "ipv6cp"; 5496 } 5497 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5498 return buf; 5499 } 5500 5501 static void 5502 sppp_print_bytes(const u_char *p, u_short len) 5503 { 5504 addlog(" %02x", *p++); 5505 while (--len > 0) 5506 addlog("-%02x", *p++); 5507 } 5508 5509 static void 5510 sppp_print_string(const char *p, u_short len) 5511 { 5512 u_char c; 5513 5514 while (len-- > 0) { 5515 c = *p++; 5516 /* 5517 * Print only ASCII chars directly. RFC 1994 recommends 5518 * using only them, but we don't rely on it. */ 5519 if (c < ' ' || c > '~') 5520 addlog("\\x%x", c); 5521 else 5522 addlog("%c", c); 5523 } 5524 } 5525 5526 static const char * 5527 sppp_dotted_quad(uint32_t addr) 5528 { 5529 static char s[16]; 5530 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5531 (int)((addr >> 24) & 0xff), 5532 (int)((addr >> 16) & 0xff), 5533 (int)((addr >> 8) & 0xff), 5534 (int)(addr & 0xff)); 5535 return s; 5536 } 5537 5538 /* a dummy, used to drop uninteresting events */ 5539 static void 5540 sppp_null(struct sppp *unused) 5541 { 5542 /* do just nothing */ 5543 } 5544 /* 5545 * This file is large. Tell emacs to highlight it nevertheless. 5546 * 5547 * Local Variables: 5548 * hilit-auto-highlight-maxout: 120000 5549 * End: 5550 */ 5551
Indexes created Fri Sep 26 08:10:20 GMT 2025