if_spppsubr.c revision 1.131.2.2
1 /* $NetBSD: if_spppsubr.c,v 1.131.2.2 2015/09/22 12:06:10 skrll 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 1.131.2.2 2015/09/22 12:06:10 skrll Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_modular.h" 49 #include "opt_compat_netbsd.h" 50 #endif 51 52 53 #include <sys/param.h> 54 #include <sys/proc.h> 55 #include <sys/systm.h> 56 #include <sys/kernel.h> 57 #include <sys/sockio.h> 58 #include <sys/socket.h> 59 #include <sys/syslog.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/callout.h> 63 #include <sys/md5.h> 64 #include <sys/inttypes.h> 65 #include <sys/kauth.h> 66 #include <sys/cprng.h> 67 68 #include <net/if.h> 69 #include <net/netisr.h> 70 #include <net/if_types.h> 71 #include <net/route.h> 72 #include <net/ppp_defs.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/in_var.h> 77 #ifdef INET 78 #include <netinet/ip.h> 79 #include <netinet/tcp.h> 80 #endif 81 #include <net/ethertypes.h> 82 83 #ifdef INET6 84 #include <netinet6/scope6_var.h> 85 #endif 86 87 #include <net/if_sppp.h> 88 #include <net/if_spppvar.h> 89 90 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 91 #define LOOPALIVECNT 3 /* loopback detection tries */ 92 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 93 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 94 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 95 96 /* 97 * Interface flags that can be set in an ifconfig command. 98 * 99 * Setting link0 will make the link passive, i.e. it will be marked 100 * as being administrative openable, but won't be opened to begin 101 * with. Incoming calls will be answered, or subsequent calls with 102 * -link1 will cause the administrative open of the LCP layer. 103 * 104 * Setting link1 will cause the link to auto-dial only as packets 105 * arrive to be sent. 106 * 107 * Setting IFF_DEBUG will syslog the option negotiation and state 108 * transitions at level kern.debug. Note: all logs consistently look 109 * like 110 * 111 * <if-name><unit>: <proto-name> <additional info...> 112 * 113 * with <if-name><unit> being something like "bppp0", and <proto-name> 114 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 115 */ 116 117 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 118 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 119 120 #define CONF_REQ 1 /* PPP configure request */ 121 #define CONF_ACK 2 /* PPP configure acknowledge */ 122 #define CONF_NAK 3 /* PPP configure negative ack */ 123 #define CONF_REJ 4 /* PPP configure reject */ 124 #define TERM_REQ 5 /* PPP terminate request */ 125 #define TERM_ACK 6 /* PPP terminate acknowledge */ 126 #define CODE_REJ 7 /* PPP code reject */ 127 #define PROTO_REJ 8 /* PPP protocol reject */ 128 #define ECHO_REQ 9 /* PPP echo request */ 129 #define ECHO_REPLY 10 /* PPP echo reply */ 130 #define DISC_REQ 11 /* PPP discard request */ 131 132 #define LCP_OPT_MRU 1 /* maximum receive unit */ 133 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 134 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 135 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 136 #define LCP_OPT_MAGIC 5 /* magic number */ 137 #define LCP_OPT_RESERVED 6 /* reserved */ 138 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 139 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 140 141 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 142 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 143 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 144 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 145 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 146 147 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 148 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 149 150 #define PAP_REQ 1 /* PAP name/password request */ 151 #define PAP_ACK 2 /* PAP acknowledge */ 152 #define PAP_NAK 3 /* PAP fail */ 153 154 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 155 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 156 #define CHAP_SUCCESS 3 /* CHAP response ok */ 157 #define CHAP_FAILURE 4 /* CHAP response failed */ 158 159 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 160 161 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 162 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 163 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 164 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 165 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 166 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 167 168 /* states are named and numbered according to RFC 1661 */ 169 #define STATE_INITIAL 0 170 #define STATE_STARTING 1 171 #define STATE_CLOSED 2 172 #define STATE_STOPPED 3 173 #define STATE_CLOSING 4 174 #define STATE_STOPPING 5 175 #define STATE_REQ_SENT 6 176 #define STATE_ACK_RCVD 7 177 #define STATE_ACK_SENT 8 178 #define STATE_OPENED 9 179 180 struct ppp_header { 181 uint8_t address; 182 uint8_t control; 183 uint16_t protocol; 184 } __packed; 185 #define PPP_HEADER_LEN sizeof (struct ppp_header) 186 187 struct lcp_header { 188 uint8_t type; 189 uint8_t ident; 190 uint16_t len; 191 } __packed; 192 #define LCP_HEADER_LEN sizeof (struct lcp_header) 193 194 struct cisco_packet { 195 uint32_t type; 196 uint32_t par1; 197 uint32_t par2; 198 uint16_t rel; 199 uint16_t time0; 200 uint16_t time1; 201 } __packed; 202 #define CISCO_PACKET_LEN 18 203 204 /* 205 * We follow the spelling and capitalization of RFC 1661 here, to make 206 * it easier comparing with the standard. Please refer to this RFC in 207 * case you can't make sense out of these abbreviation; it will also 208 * explain the semantics related to the various events and actions. 209 */ 210 struct cp { 211 u_short proto; /* PPP control protocol number */ 212 u_char protoidx; /* index into state table in struct sppp */ 213 u_char flags; 214 #define CP_LCP 0x01 /* this is the LCP */ 215 #define CP_AUTH 0x02 /* this is an authentication protocol */ 216 #define CP_NCP 0x04 /* this is a NCP */ 217 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 218 const char *name; /* name of this control protocol */ 219 /* event handlers */ 220 void (*Up)(struct sppp *sp); 221 void (*Down)(struct sppp *sp); 222 void (*Open)(struct sppp *sp); 223 void (*Close)(struct sppp *sp); 224 void (*TO)(void *sp); 225 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 226 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 227 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 228 /* actions */ 229 void (*tlu)(struct sppp *sp); 230 void (*tld)(struct sppp *sp); 231 void (*tls)(struct sppp *sp); 232 void (*tlf)(struct sppp *sp); 233 void (*scr)(struct sppp *sp); 234 }; 235 236 static struct sppp *spppq; 237 static callout_t keepalive_ch; 238 239 #ifdef INET 240 /* 241 * The following disgusting hack gets around the problem that IP TOS 242 * can't be set yet. We want to put "interactive" traffic on a high 243 * priority queue. To decide if traffic is interactive, we check that 244 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 245 * 246 * XXX is this really still necessary? - joerg - 247 */ 248 static u_short interactive_ports[8] = { 249 0, 513, 0, 0, 250 0, 21, 0, 23, 251 }; 252 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 253 #endif 254 255 /* almost every function needs these */ 256 #define STDDCL \ 257 struct ifnet *ifp = &sp->pp_if; \ 258 int debug = ifp->if_flags & IFF_DEBUG 259 260 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 261 const struct sockaddr *dst, struct rtentry *rt); 262 263 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 264 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 265 266 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 267 struct mbuf *m); 268 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 269 u_char ident, u_short len, void *data); 270 /* static void sppp_cp_timeout(void *arg); */ 271 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 272 int newstate); 273 static void sppp_auth_send(const struct cp *cp, 274 struct sppp *sp, unsigned int type, unsigned int id, 275 ...); 276 277 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 278 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 279 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 280 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 281 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 282 283 static void sppp_null(struct sppp *sp); 284 285 static void sppp_lcp_init(struct sppp *sp); 286 static void sppp_lcp_up(struct sppp *sp); 287 static void sppp_lcp_down(struct sppp *sp); 288 static void sppp_lcp_open(struct sppp *sp); 289 static void sppp_lcp_close(struct sppp *sp); 290 static void sppp_lcp_TO(void *sp); 291 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 292 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 293 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 294 static void sppp_lcp_tlu(struct sppp *sp); 295 static void sppp_lcp_tld(struct sppp *sp); 296 static void sppp_lcp_tls(struct sppp *sp); 297 static void sppp_lcp_tlf(struct sppp *sp); 298 static void sppp_lcp_scr(struct sppp *sp); 299 static void sppp_lcp_check_and_close(struct sppp *sp); 300 static int sppp_ncp_check(struct sppp *sp); 301 302 static void sppp_ipcp_init(struct sppp *sp); 303 static void sppp_ipcp_up(struct sppp *sp); 304 static void sppp_ipcp_down(struct sppp *sp); 305 static void sppp_ipcp_open(struct sppp *sp); 306 static void sppp_ipcp_close(struct sppp *sp); 307 static void sppp_ipcp_TO(void *sp); 308 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_ipcp_tlu(struct sppp *sp); 312 static void sppp_ipcp_tld(struct sppp *sp); 313 static void sppp_ipcp_tls(struct sppp *sp); 314 static void sppp_ipcp_tlf(struct sppp *sp); 315 static void sppp_ipcp_scr(struct sppp *sp); 316 317 static void sppp_ipv6cp_init(struct sppp *sp); 318 static void sppp_ipv6cp_up(struct sppp *sp); 319 static void sppp_ipv6cp_down(struct sppp *sp); 320 static void sppp_ipv6cp_open(struct sppp *sp); 321 static void sppp_ipv6cp_close(struct sppp *sp); 322 static void sppp_ipv6cp_TO(void *sp); 323 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 324 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 325 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipv6cp_tlu(struct sppp *sp); 327 static void sppp_ipv6cp_tld(struct sppp *sp); 328 static void sppp_ipv6cp_tls(struct sppp *sp); 329 static void sppp_ipv6cp_tlf(struct sppp *sp); 330 static void sppp_ipv6cp_scr(struct sppp *sp); 331 332 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 333 static void sppp_pap_init(struct sppp *sp); 334 static void sppp_pap_open(struct sppp *sp); 335 static void sppp_pap_close(struct sppp *sp); 336 static void sppp_pap_TO(void *sp); 337 static void sppp_pap_my_TO(void *sp); 338 static void sppp_pap_tlu(struct sppp *sp); 339 static void sppp_pap_tld(struct sppp *sp); 340 static void sppp_pap_scr(struct sppp *sp); 341 342 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 343 static void sppp_chap_init(struct sppp *sp); 344 static void sppp_chap_open(struct sppp *sp); 345 static void sppp_chap_close(struct sppp *sp); 346 static void sppp_chap_TO(void *sp); 347 static void sppp_chap_tlu(struct sppp *sp); 348 static void sppp_chap_tld(struct sppp *sp); 349 static void sppp_chap_scr(struct sppp *sp); 350 351 static const char *sppp_auth_type_name(u_short proto, u_char type); 352 static const char *sppp_cp_type_name(u_char type); 353 static const char *sppp_dotted_quad(uint32_t addr); 354 static const char *sppp_ipcp_opt_name(u_char opt); 355 #ifdef INET6 356 static const char *sppp_ipv6cp_opt_name(u_char opt); 357 #endif 358 static const char *sppp_lcp_opt_name(u_char opt); 359 static const char *sppp_phase_name(int phase); 360 static const char *sppp_proto_name(u_short proto); 361 static const char *sppp_state_name(int state); 362 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 363 #ifdef INET 364 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 365 uint32_t *srcmask); 366 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 367 static void sppp_clear_ip_addrs(struct sppp *sp); 368 #endif 369 static void sppp_keepalive(void *dummy); 370 static void sppp_phase_network(struct sppp *sp); 371 static void sppp_print_bytes(const u_char *p, u_short len); 372 static void sppp_print_string(const char *p, u_short len); 373 #ifdef INET6 374 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 375 struct in6_addr *dst, struct in6_addr *srcmask); 376 #ifdef IPV6CP_MYIFID_DYN 377 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 378 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 379 #endif 380 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 381 #endif 382 383 /* our control protocol descriptors */ 384 static const struct cp lcp = { 385 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 386 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 387 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 388 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 389 sppp_lcp_scr 390 }; 391 392 static const struct cp ipcp = { 393 PPP_IPCP, IDX_IPCP, 394 #ifdef INET 395 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 396 #else 397 0, 398 #endif 399 "ipcp", 400 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 401 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 402 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 403 sppp_ipcp_scr 404 }; 405 406 static const struct cp ipv6cp = { 407 PPP_IPV6CP, IDX_IPV6CP, 408 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 409 CP_NCP, 410 #else 411 0, 412 #endif 413 "ipv6cp", 414 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 415 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 416 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 417 sppp_ipv6cp_scr 418 }; 419 420 static const struct cp pap = { 421 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 422 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 423 sppp_pap_TO, 0, 0, 0, 424 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 425 sppp_pap_scr 426 }; 427 428 static const struct cp chap = { 429 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 430 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 431 sppp_chap_TO, 0, 0, 0, 432 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 433 sppp_chap_scr 434 }; 435 436 static const struct cp *cps[IDX_COUNT] = { 437 &lcp, /* IDX_LCP */ 438 &ipcp, /* IDX_IPCP */ 439 &ipv6cp, /* IDX_IPV6CP */ 440 &pap, /* IDX_PAP */ 441 &chap, /* IDX_CHAP */ 442 }; 443 444 445 /* 446 * Exported functions, comprising our interface to the lower layer. 447 */ 448 449 /* 450 * Process the received packet. 451 */ 452 void 453 sppp_input(struct ifnet *ifp, struct mbuf *m) 454 { 455 struct ppp_header *h = NULL; 456 pktqueue_t *pktq = NULL; 457 struct ifqueue *inq = NULL; 458 uint16_t protocol; 459 int s; 460 struct sppp *sp = (struct sppp *)ifp; 461 int debug = ifp->if_flags & IFF_DEBUG; 462 int isr = 0; 463 464 if (ifp->if_flags & IFF_UP) { 465 /* Count received bytes, add hardware framing */ 466 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 467 /* Note time of last receive */ 468 sp->pp_last_receive = time_uptime; 469 } 470 471 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 472 /* Too small packet, drop it. */ 473 if (debug) 474 log(LOG_DEBUG, 475 "%s: input packet is too small, %d bytes\n", 476 ifp->if_xname, m->m_pkthdr.len); 477 drop: 478 ++ifp->if_ierrors; 479 ++ifp->if_iqdrops; 480 m_freem(m); 481 return; 482 } 483 484 if (sp->pp_flags & PP_NOFRAMING) { 485 memcpy(&protocol, mtod(m, void *), 2); 486 protocol = ntohs(protocol); 487 m_adj(m, 2); 488 } else { 489 490 /* Get PPP header. */ 491 h = mtod(m, struct ppp_header *); 492 m_adj(m, PPP_HEADER_LEN); 493 494 switch (h->address) { 495 case PPP_ALLSTATIONS: 496 if (h->control != PPP_UI) 497 goto invalid; 498 if (sp->pp_flags & PP_CISCO) { 499 if (debug) 500 log(LOG_DEBUG, 501 "%s: PPP packet in Cisco mode " 502 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 503 ifp->if_xname, 504 h->address, h->control, ntohs(h->protocol)); 505 goto drop; 506 } 507 break; 508 case CISCO_MULTICAST: 509 case CISCO_UNICAST: 510 /* Don't check the control field here (RFC 1547). */ 511 if (! (sp->pp_flags & PP_CISCO)) { 512 if (debug) 513 log(LOG_DEBUG, 514 "%s: Cisco packet in PPP mode " 515 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 516 ifp->if_xname, 517 h->address, h->control, ntohs(h->protocol)); 518 goto drop; 519 } 520 switch (ntohs(h->protocol)) { 521 default: 522 ++ifp->if_noproto; 523 goto invalid; 524 case CISCO_KEEPALIVE: 525 sppp_cisco_input((struct sppp *) ifp, m); 526 m_freem(m); 527 return; 528 #ifdef INET 529 case ETHERTYPE_IP: 530 pktq = ip_pktq; 531 break; 532 #endif 533 #ifdef INET6 534 case ETHERTYPE_IPV6: 535 pktq = ip6_pktq; 536 break; 537 #endif 538 } 539 goto queue_pkt; 540 default: /* Invalid PPP packet. */ 541 invalid: 542 if (debug) 543 log(LOG_DEBUG, 544 "%s: invalid input packet " 545 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 546 ifp->if_xname, 547 h->address, h->control, ntohs(h->protocol)); 548 goto drop; 549 } 550 protocol = ntohs(h->protocol); 551 } 552 553 switch (protocol) { 554 default: 555 if (sp->state[IDX_LCP] == STATE_OPENED) { 556 uint16_t prot = htons(protocol); 557 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 558 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 559 &prot); 560 } 561 if (debug) 562 log(LOG_DEBUG, 563 "%s: invalid input protocol " 564 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 565 ++ifp->if_noproto; 566 goto drop; 567 case PPP_LCP: 568 sppp_cp_input(&lcp, sp, m); 569 m_freem(m); 570 return; 571 case PPP_PAP: 572 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 573 sppp_pap_input(sp, m); 574 m_freem(m); 575 return; 576 case PPP_CHAP: 577 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 578 sppp_chap_input(sp, m); 579 m_freem(m); 580 return; 581 #ifdef INET 582 case PPP_IPCP: 583 if (sp->pp_phase == SPPP_PHASE_NETWORK) 584 sppp_cp_input(&ipcp, sp, m); 585 m_freem(m); 586 return; 587 case PPP_IP: 588 if (sp->state[IDX_IPCP] == STATE_OPENED) { 589 sp->pp_last_activity = time_uptime; 590 pktq = ip_pktq; 591 } 592 break; 593 #endif 594 #ifdef INET6 595 case PPP_IPV6CP: 596 if (sp->pp_phase == SPPP_PHASE_NETWORK) 597 sppp_cp_input(&ipv6cp, sp, m); 598 m_freem(m); 599 return; 600 601 case PPP_IPV6: 602 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 603 sp->pp_last_activity = time_uptime; 604 pktq = ip6_pktq; 605 } 606 break; 607 #endif 608 } 609 610 queue_pkt: 611 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 612 goto drop; 613 } 614 615 /* Check queue. */ 616 if (__predict_true(pktq)) { 617 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 618 goto drop; 619 } 620 return; 621 } 622 623 s = splnet(); 624 if (IF_QFULL(inq)) { 625 /* Queue overflow. */ 626 IF_DROP(inq); 627 splx(s); 628 if (debug) 629 log(LOG_DEBUG, "%s: protocol queue overflow\n", 630 ifp->if_xname); 631 goto drop; 632 } 633 IF_ENQUEUE(inq, m); 634 schednetisr(isr); 635 splx(s); 636 } 637 638 /* 639 * Enqueue transmit packet. 640 */ 641 static int 642 sppp_output(struct ifnet *ifp, struct mbuf *m, 643 const struct sockaddr *dst, struct rtentry *rt) 644 { 645 struct sppp *sp = (struct sppp *) ifp; 646 struct ppp_header *h = NULL; 647 struct ifqueue *ifq = NULL; /* XXX */ 648 int s, error = 0; 649 uint16_t protocol; 650 ALTQ_DECL(struct altq_pktattr pktattr;) 651 652 s = splnet(); 653 654 sp->pp_last_activity = time_uptime; 655 656 if ((ifp->if_flags & IFF_UP) == 0 || 657 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 658 m_freem(m); 659 splx(s); 660 return (ENETDOWN); 661 } 662 663 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 664 /* 665 * Interface is not yet running, but auto-dial. Need 666 * to start LCP for it. 667 */ 668 ifp->if_flags |= IFF_RUNNING; 669 splx(s); 670 lcp.Open(sp); 671 s = splnet(); 672 } 673 674 /* 675 * If the queueing discipline needs packet classification, 676 * do it before prepending link headers. 677 */ 678 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 679 680 #ifdef INET 681 if (dst->sa_family == AF_INET) { 682 struct ip *ip = NULL; 683 struct tcphdr *th = NULL; 684 685 if (m->m_len >= sizeof(struct ip)) { 686 ip = mtod(m, struct ip *); 687 if (ip->ip_p == IPPROTO_TCP && 688 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 689 sizeof(struct tcphdr)) { 690 th = (struct tcphdr *) 691 ((char *)ip + (ip->ip_hl << 2)); 692 } 693 } else 694 ip = NULL; 695 696 /* 697 * When using dynamic local IP address assignment by using 698 * 0.0.0.0 as a local address, the first TCP session will 699 * not connect because the local TCP checksum is computed 700 * using 0.0.0.0 which will later become our real IP address 701 * so the TCP checksum computed at the remote end will 702 * become invalid. So we 703 * - don't let packets with src ip addr 0 thru 704 * - we flag TCP packets with src ip 0 as an error 705 */ 706 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 707 uint8_t proto = ip->ip_p; 708 709 m_freem(m); 710 splx(s); 711 if (proto == IPPROTO_TCP) 712 return (EADDRNOTAVAIL); 713 else 714 return (0); 715 } 716 717 /* 718 * Put low delay, telnet, rlogin and ftp control packets 719 * in front of the queue. 720 */ 721 722 if (!IF_QFULL(&sp->pp_fastq) && 723 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 724 (th && (INTERACTIVE(ntohs(th->th_sport)) || 725 INTERACTIVE(ntohs(th->th_dport)))))) 726 ifq = &sp->pp_fastq; 727 } 728 #endif 729 730 #ifdef INET6 731 if (dst->sa_family == AF_INET6) { 732 /* XXX do something tricky here? */ 733 } 734 #endif 735 736 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 737 /* 738 * Prepend general data packet PPP header. For now, IP only. 739 */ 740 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 741 if (! m) { 742 if (ifp->if_flags & IFF_DEBUG) 743 log(LOG_DEBUG, "%s: no memory for transmit header\n", 744 ifp->if_xname); 745 ++ifp->if_oerrors; 746 splx(s); 747 return (ENOBUFS); 748 } 749 /* 750 * May want to check size of packet 751 * (albeit due to the implementation it's always enough) 752 */ 753 h = mtod(m, struct ppp_header *); 754 if (sp->pp_flags & PP_CISCO) { 755 h->address = CISCO_UNICAST; /* unicast address */ 756 h->control = 0; 757 } else { 758 h->address = PPP_ALLSTATIONS; /* broadcast address */ 759 h->control = PPP_UI; /* Unnumbered Info */ 760 } 761 } 762 763 switch (dst->sa_family) { 764 #ifdef INET 765 case AF_INET: /* Internet Protocol */ 766 if (sp->pp_flags & PP_CISCO) 767 protocol = htons(ETHERTYPE_IP); 768 else { 769 /* 770 * Don't choke with an ENETDOWN early. It's 771 * possible that we just started dialing out, 772 * so don't drop the packet immediately. If 773 * we notice that we run out of buffer space 774 * below, we will however remember that we are 775 * not ready to carry IP packets, and return 776 * ENETDOWN, as opposed to ENOBUFS. 777 */ 778 protocol = htons(PPP_IP); 779 if (sp->state[IDX_IPCP] != STATE_OPENED) 780 error = ENETDOWN; 781 } 782 break; 783 #endif 784 #ifdef INET6 785 case AF_INET6: /* Internet Protocol version 6 */ 786 if (sp->pp_flags & PP_CISCO) 787 protocol = htons(ETHERTYPE_IPV6); 788 else { 789 /* 790 * Don't choke with an ENETDOWN early. It's 791 * possible that we just started dialing out, 792 * so don't drop the packet immediately. If 793 * we notice that we run out of buffer space 794 * below, we will however remember that we are 795 * not ready to carry IP packets, and return 796 * ENETDOWN, as opposed to ENOBUFS. 797 */ 798 protocol = htons(PPP_IPV6); 799 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 800 error = ENETDOWN; 801 } 802 break; 803 #endif 804 default: 805 m_freem(m); 806 ++ifp->if_oerrors; 807 splx(s); 808 return (EAFNOSUPPORT); 809 } 810 811 if (sp->pp_flags & PP_NOFRAMING) { 812 M_PREPEND(m, 2, M_DONTWAIT); 813 if (m == NULL) { 814 if (ifp->if_flags & IFF_DEBUG) 815 log(LOG_DEBUG, "%s: no memory for transmit header\n", 816 ifp->if_xname); 817 ++ifp->if_oerrors; 818 splx(s); 819 return (ENOBUFS); 820 } 821 *mtod(m, uint16_t *) = protocol; 822 } else { 823 h->protocol = protocol; 824 } 825 826 827 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 828 829 if (error == 0) { 830 /* 831 * Count output packets and bytes. 832 * The packet length includes header + additional hardware 833 * framing according to RFC 1333. 834 */ 835 if (!(ifp->if_flags & IFF_OACTIVE)) 836 (*ifp->if_start)(ifp); 837 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 838 } 839 splx(s); 840 return error; 841 } 842 843 void 844 sppp_attach(struct ifnet *ifp) 845 { 846 struct sppp *sp = (struct sppp *) ifp; 847 848 /* Initialize keepalive handler. */ 849 if (! spppq) { 850 callout_init(&keepalive_ch, 0); 851 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 852 } 853 854 /* Insert new entry into the keepalive list. */ 855 sp->pp_next = spppq; 856 spppq = sp; 857 858 sp->pp_if.if_type = IFT_PPP; 859 sp->pp_if.if_output = sppp_output; 860 sp->pp_fastq.ifq_maxlen = 32; 861 sp->pp_cpq.ifq_maxlen = 20; 862 sp->pp_loopcnt = 0; 863 sp->pp_alivecnt = 0; 864 sp->pp_last_activity = 0; 865 sp->pp_last_receive = 0; 866 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 867 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 868 sp->pp_idle_timeout = 0; 869 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 870 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 871 sp->pp_auth_failures = 0; 872 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 873 sp->pp_phase = SPPP_PHASE_DEAD; 874 sp->pp_up = lcp.Up; 875 sp->pp_down = lcp.Down; 876 877 if_alloc_sadl(ifp); 878 879 memset(&sp->myauth, 0, sizeof sp->myauth); 880 memset(&sp->hisauth, 0, sizeof sp->hisauth); 881 sppp_lcp_init(sp); 882 sppp_ipcp_init(sp); 883 sppp_ipv6cp_init(sp); 884 sppp_pap_init(sp); 885 sppp_chap_init(sp); 886 } 887 888 void 889 sppp_detach(struct ifnet *ifp) 890 { 891 struct sppp **q, *p, *sp = (struct sppp *) ifp; 892 893 /* Remove the entry from the keepalive list. */ 894 for (q = &spppq; (p = *q); q = &p->pp_next) 895 if (p == sp) { 896 *q = p->pp_next; 897 break; 898 } 899 900 /* Stop keepalive handler. */ 901 if (! spppq) { 902 callout_stop(&keepalive_ch); 903 } 904 905 callout_stop(&sp->ch[IDX_LCP]); 906 callout_stop(&sp->ch[IDX_IPCP]); 907 callout_stop(&sp->ch[IDX_PAP]); 908 callout_stop(&sp->ch[IDX_CHAP]); 909 #ifdef INET6 910 callout_stop(&sp->ch[IDX_IPV6CP]); 911 #endif 912 callout_stop(&sp->pap_my_to_ch); 913 914 /* free authentication info */ 915 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 916 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 917 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 918 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 919 } 920 921 /* 922 * Flush the interface output queue. 923 */ 924 void 925 sppp_flush(struct ifnet *ifp) 926 { 927 struct sppp *sp = (struct sppp *) ifp; 928 929 IFQ_PURGE(&sp->pp_if.if_snd); 930 IF_PURGE(&sp->pp_fastq); 931 IF_PURGE(&sp->pp_cpq); 932 } 933 934 /* 935 * Check if the output queue is empty. 936 */ 937 int 938 sppp_isempty(struct ifnet *ifp) 939 { 940 struct sppp *sp = (struct sppp *) ifp; 941 int empty, s; 942 943 s = splnet(); 944 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 945 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 946 splx(s); 947 return (empty); 948 } 949 950 /* 951 * Get next packet to send. 952 */ 953 struct mbuf * 954 sppp_dequeue(struct ifnet *ifp) 955 { 956 struct sppp *sp = (struct sppp *) ifp; 957 struct mbuf *m; 958 int s; 959 960 s = splnet(); 961 /* 962 * Process only the control protocol queue until we have at 963 * least one NCP open. 964 * 965 * Do always serve all three queues in Cisco mode. 966 */ 967 IF_DEQUEUE(&sp->pp_cpq, m); 968 if (m == NULL && 969 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 970 IF_DEQUEUE(&sp->pp_fastq, m); 971 if (m == NULL) 972 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 973 } 974 splx(s); 975 return m; 976 } 977 978 /* 979 * Process an ioctl request. Called on low priority level. 980 */ 981 int 982 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 983 { 984 struct lwp *l = curlwp; /* XXX */ 985 struct ifreq *ifr = (struct ifreq *) data; 986 struct ifaddr *ifa = (struct ifaddr *) data; 987 struct sppp *sp = (struct sppp *) ifp; 988 int s, error=0, going_up, going_down, newmode; 989 990 s = splnet(); 991 switch (cmd) { 992 case SIOCINITIFADDR: 993 ifa->ifa_rtrequest = p2p_rtrequest; 994 break; 995 996 case SIOCSIFFLAGS: 997 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 998 break; 999 going_up = ifp->if_flags & IFF_UP && 1000 (ifp->if_flags & IFF_RUNNING) == 0; 1001 going_down = (ifp->if_flags & IFF_UP) == 0 && 1002 ifp->if_flags & IFF_RUNNING; 1003 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1004 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1005 /* sanity */ 1006 newmode = IFF_PASSIVE; 1007 ifp->if_flags &= ~IFF_AUTO; 1008 } 1009 1010 if (going_up || going_down) 1011 lcp.Close(sp); 1012 if (going_up && newmode == 0) { 1013 /* neither auto-dial nor passive */ 1014 ifp->if_flags |= IFF_RUNNING; 1015 if (!(sp->pp_flags & PP_CISCO)) 1016 lcp.Open(sp); 1017 } else if (going_down) { 1018 sppp_flush(ifp); 1019 ifp->if_flags &= ~IFF_RUNNING; 1020 } 1021 1022 break; 1023 1024 case SIOCSIFMTU: 1025 if (ifr->ifr_mtu < PPP_MINMRU || 1026 ifr->ifr_mtu > sp->lcp.their_mru) { 1027 error = EINVAL; 1028 break; 1029 } 1030 /*FALLTHROUGH*/ 1031 case SIOCGIFMTU: 1032 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1033 error = 0; 1034 break; 1035 case SIOCADDMULTI: 1036 case SIOCDELMULTI: 1037 break; 1038 1039 case SPPPSETAUTHCFG: 1040 case SPPPSETLCPCFG: 1041 case SPPPSETIDLETO: 1042 case SPPPSETAUTHFAILURE: 1043 case SPPPSETDNSOPTS: 1044 case SPPPSETKEEPALIVE: 1045 #if defined(COMPAT_50) || defined(MODULAR) 1046 case __SPPPSETIDLETO50: 1047 case __SPPPSETKEEPALIVE50: 1048 #endif /* COMPAT_50 || MODULAR */ 1049 error = kauth_authorize_network(l->l_cred, 1050 KAUTH_NETWORK_INTERFACE, 1051 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1052 NULL); 1053 if (error) 1054 break; 1055 error = sppp_params(sp, cmd, data); 1056 break; 1057 1058 case SPPPGETAUTHCFG: 1059 case SPPPGETLCPCFG: 1060 case SPPPGETAUTHFAILURES: 1061 error = kauth_authorize_network(l->l_cred, 1062 KAUTH_NETWORK_INTERFACE, 1063 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1064 NULL); 1065 if (error) 1066 break; 1067 error = sppp_params(sp, cmd, data); 1068 break; 1069 1070 case SPPPGETSTATUS: 1071 case SPPPGETSTATUSNCP: 1072 case SPPPGETIDLETO: 1073 case SPPPGETDNSOPTS: 1074 case SPPPGETDNSADDRS: 1075 case SPPPGETKEEPALIVE: 1076 #if defined(COMPAT_50) || defined(MODULAR) 1077 case __SPPPGETIDLETO50: 1078 case __SPPPGETKEEPALIVE50: 1079 #endif /* COMPAT_50 || MODULAR */ 1080 error = sppp_params(sp, cmd, data); 1081 break; 1082 1083 default: 1084 error = ifioctl_common(ifp, cmd, data); 1085 break; 1086 } 1087 splx(s); 1088 return (error); 1089 } 1090 1091 1092 /* 1093 * Cisco framing implementation. 1094 */ 1095 1096 /* 1097 * Handle incoming Cisco keepalive protocol packets. 1098 */ 1099 static void 1100 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1101 { 1102 STDDCL; 1103 struct cisco_packet *h; 1104 #ifdef INET 1105 uint32_t me, mymask = 0; /* XXX: GCC */ 1106 #endif 1107 1108 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1109 if (debug) 1110 log(LOG_DEBUG, 1111 "%s: cisco invalid packet length: %d bytes\n", 1112 ifp->if_xname, m->m_pkthdr.len); 1113 return; 1114 } 1115 h = mtod(m, struct cisco_packet *); 1116 if (debug) 1117 log(LOG_DEBUG, 1118 "%s: cisco input: %d bytes " 1119 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1120 ifp->if_xname, m->m_pkthdr.len, 1121 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1122 (u_int)h->time0, (u_int)h->time1); 1123 switch (ntohl(h->type)) { 1124 default: 1125 if (debug) 1126 addlog("%s: cisco unknown packet type: 0x%x\n", 1127 ifp->if_xname, ntohl(h->type)); 1128 break; 1129 case CISCO_ADDR_REPLY: 1130 /* Reply on address request, ignore */ 1131 break; 1132 case CISCO_KEEPALIVE_REQ: 1133 sp->pp_alivecnt = 0; 1134 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1135 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1136 /* Local and remote sequence numbers are equal. 1137 * Probably, the line is in loopback mode. */ 1138 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1139 printf ("%s: loopback\n", 1140 ifp->if_xname); 1141 sp->pp_loopcnt = 0; 1142 if (ifp->if_flags & IFF_UP) { 1143 if_down(ifp); 1144 IF_PURGE(&sp->pp_cpq); 1145 } 1146 } 1147 ++sp->pp_loopcnt; 1148 1149 /* Generate new local sequence number */ 1150 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1151 break; 1152 } 1153 sp->pp_loopcnt = 0; 1154 if (! (ifp->if_flags & IFF_UP) && 1155 (ifp->if_flags & IFF_RUNNING)) { 1156 if_up(ifp); 1157 } 1158 break; 1159 case CISCO_ADDR_REQ: 1160 #ifdef INET 1161 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1162 if (me != 0L) 1163 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1164 #endif 1165 break; 1166 } 1167 } 1168 1169 /* 1170 * Send Cisco keepalive packet. 1171 */ 1172 static void 1173 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1174 { 1175 STDDCL; 1176 struct ppp_header *h; 1177 struct cisco_packet *ch; 1178 struct mbuf *m; 1179 uint32_t t; 1180 1181 t = time_uptime * 1000; 1182 MGETHDR(m, M_DONTWAIT, MT_DATA); 1183 if (! m) 1184 return; 1185 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1186 m->m_pkthdr.rcvif = 0; 1187 1188 h = mtod(m, struct ppp_header *); 1189 h->address = CISCO_MULTICAST; 1190 h->control = 0; 1191 h->protocol = htons(CISCO_KEEPALIVE); 1192 1193 ch = (struct cisco_packet *)(h + 1); 1194 ch->type = htonl(type); 1195 ch->par1 = htonl(par1); 1196 ch->par2 = htonl(par2); 1197 ch->rel = -1; 1198 1199 ch->time0 = htons((u_short)(t >> 16)); 1200 ch->time1 = htons((u_short) t); 1201 1202 if (debug) 1203 log(LOG_DEBUG, 1204 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1205 ifp->if_xname, ntohl(ch->type), ch->par1, 1206 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1207 (u_int)ch->time1); 1208 1209 if (IF_QFULL(&sp->pp_cpq)) { 1210 IF_DROP(&sp->pp_fastq); 1211 IF_DROP(&ifp->if_snd); 1212 m_freem(m); 1213 ++ifp->if_oerrors; 1214 return; 1215 } else 1216 IF_ENQUEUE(&sp->pp_cpq, m); 1217 if (! (ifp->if_flags & IFF_OACTIVE)) 1218 (*ifp->if_start)(ifp); 1219 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1220 } 1221 1222 /* 1223 * PPP protocol implementation. 1224 */ 1225 1226 /* 1227 * Send PPP control protocol packet. 1228 */ 1229 static void 1230 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1231 u_char ident, u_short len, void *data) 1232 { 1233 STDDCL; 1234 struct lcp_header *lh; 1235 struct mbuf *m; 1236 size_t pkthdrlen; 1237 1238 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1239 1240 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1241 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1242 MGETHDR(m, M_DONTWAIT, MT_DATA); 1243 if (! m) 1244 return; 1245 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1246 m->m_pkthdr.rcvif = 0; 1247 1248 if (sp->pp_flags & PP_NOFRAMING) { 1249 *mtod(m, uint16_t *) = htons(proto); 1250 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1251 } else { 1252 struct ppp_header *h; 1253 h = mtod(m, struct ppp_header *); 1254 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1255 h->control = PPP_UI; /* Unnumbered Info */ 1256 h->protocol = htons(proto); /* Link Control Protocol */ 1257 lh = (struct lcp_header *)(h + 1); 1258 } 1259 lh->type = type; 1260 lh->ident = ident; 1261 lh->len = htons(LCP_HEADER_LEN + len); 1262 if (len) 1263 bcopy (data, lh + 1, len); 1264 1265 if (debug) { 1266 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1267 ifp->if_xname, 1268 sppp_proto_name(proto), 1269 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1270 if (len) 1271 sppp_print_bytes((u_char *)(lh + 1), len); 1272 addlog(">\n"); 1273 } 1274 if (IF_QFULL(&sp->pp_cpq)) { 1275 IF_DROP(&sp->pp_fastq); 1276 IF_DROP(&ifp->if_snd); 1277 m_freem(m); 1278 ++ifp->if_oerrors; 1279 return; 1280 } else 1281 IF_ENQUEUE(&sp->pp_cpq, m); 1282 if (! (ifp->if_flags & IFF_OACTIVE)) 1283 (*ifp->if_start)(ifp); 1284 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1285 } 1286 1287 /* 1288 * Handle incoming PPP control protocol packets. 1289 */ 1290 static void 1291 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1292 { 1293 STDDCL; 1294 struct lcp_header *h; 1295 int printlen, len = m->m_pkthdr.len; 1296 int rv; 1297 u_char *p; 1298 uint32_t u32; 1299 1300 if (len < 4) { 1301 if (debug) 1302 log(LOG_DEBUG, 1303 "%s: %s invalid packet length: %d bytes\n", 1304 ifp->if_xname, cp->name, len); 1305 return; 1306 } 1307 h = mtod(m, struct lcp_header *); 1308 if (debug) { 1309 printlen = ntohs(h->len); 1310 log(LOG_DEBUG, 1311 "%s: %s input(%s): <%s id=0x%x len=%d", 1312 ifp->if_xname, cp->name, 1313 sppp_state_name(sp->state[cp->protoidx]), 1314 sppp_cp_type_name(h->type), h->ident, printlen); 1315 if (len < printlen) 1316 printlen = len; 1317 if (printlen > 4) 1318 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1319 addlog(">\n"); 1320 } 1321 if (len > ntohs(h->len)) 1322 len = ntohs(h->len); 1323 p = (u_char *)(h + 1); 1324 switch (h->type) { 1325 case CONF_REQ: 1326 if (len < 4) { 1327 if (debug) 1328 addlog("%s: %s invalid conf-req length %d\n", 1329 ifp->if_xname, cp->name, 1330 len); 1331 ++ifp->if_ierrors; 1332 break; 1333 } 1334 /* handle states where RCR doesn't get a SCA/SCN */ 1335 switch (sp->state[cp->protoidx]) { 1336 case STATE_CLOSING: 1337 case STATE_STOPPING: 1338 return; 1339 case STATE_CLOSED: 1340 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1341 0, 0); 1342 return; 1343 } 1344 rv = (cp->RCR)(sp, h, len); 1345 if (rv < 0) { 1346 /* fatal error, shut down */ 1347 (cp->tld)(sp); 1348 sppp_lcp_tlf(sp); 1349 return; 1350 } 1351 switch (sp->state[cp->protoidx]) { 1352 case STATE_OPENED: 1353 (cp->tld)(sp); 1354 (cp->scr)(sp); 1355 /* fall through... */ 1356 case STATE_ACK_SENT: 1357 case STATE_REQ_SENT: 1358 sppp_cp_change_state(cp, sp, rv? 1359 STATE_ACK_SENT: STATE_REQ_SENT); 1360 break; 1361 case STATE_STOPPED: 1362 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1363 (cp->scr)(sp); 1364 sppp_cp_change_state(cp, sp, rv? 1365 STATE_ACK_SENT: STATE_REQ_SENT); 1366 break; 1367 case STATE_ACK_RCVD: 1368 if (rv) { 1369 sppp_cp_change_state(cp, sp, STATE_OPENED); 1370 if (debug) 1371 log(LOG_DEBUG, "%s: %s tlu\n", 1372 ifp->if_xname, 1373 cp->name); 1374 (cp->tlu)(sp); 1375 } else 1376 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1377 break; 1378 default: 1379 printf("%s: %s illegal %s in state %s\n", 1380 ifp->if_xname, cp->name, 1381 sppp_cp_type_name(h->type), 1382 sppp_state_name(sp->state[cp->protoidx])); 1383 ++ifp->if_ierrors; 1384 } 1385 break; 1386 case CONF_ACK: 1387 if (h->ident != sp->confid[cp->protoidx]) { 1388 if (debug) 1389 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1390 ifp->if_xname, cp->name, 1391 h->ident, sp->confid[cp->protoidx]); 1392 ++ifp->if_ierrors; 1393 break; 1394 } 1395 switch (sp->state[cp->protoidx]) { 1396 case STATE_CLOSED: 1397 case STATE_STOPPED: 1398 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1399 break; 1400 case STATE_CLOSING: 1401 case STATE_STOPPING: 1402 break; 1403 case STATE_REQ_SENT: 1404 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1405 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1406 break; 1407 case STATE_OPENED: 1408 (cp->tld)(sp); 1409 /* fall through */ 1410 case STATE_ACK_RCVD: 1411 (cp->scr)(sp); 1412 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1413 break; 1414 case STATE_ACK_SENT: 1415 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1416 sppp_cp_change_state(cp, sp, STATE_OPENED); 1417 if (debug) 1418 log(LOG_DEBUG, "%s: %s tlu\n", 1419 ifp->if_xname, cp->name); 1420 (cp->tlu)(sp); 1421 break; 1422 default: 1423 printf("%s: %s illegal %s in state %s\n", 1424 ifp->if_xname, cp->name, 1425 sppp_cp_type_name(h->type), 1426 sppp_state_name(sp->state[cp->protoidx])); 1427 ++ifp->if_ierrors; 1428 } 1429 break; 1430 case CONF_NAK: 1431 case CONF_REJ: 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 if (h->type == CONF_NAK) 1441 (cp->RCN_nak)(sp, h, len); 1442 else /* CONF_REJ */ 1443 (cp->RCN_rej)(sp, h, len); 1444 1445 switch (sp->state[cp->protoidx]) { 1446 case STATE_CLOSED: 1447 case STATE_STOPPED: 1448 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1449 break; 1450 case STATE_REQ_SENT: 1451 case STATE_ACK_SENT: 1452 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1453 (cp->scr)(sp); 1454 break; 1455 case STATE_OPENED: 1456 (cp->tld)(sp); 1457 /* fall through */ 1458 case STATE_ACK_RCVD: 1459 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1460 (cp->scr)(sp); 1461 break; 1462 case STATE_CLOSING: 1463 case STATE_STOPPING: 1464 break; 1465 default: 1466 printf("%s: %s illegal %s in state %s\n", 1467 ifp->if_xname, cp->name, 1468 sppp_cp_type_name(h->type), 1469 sppp_state_name(sp->state[cp->protoidx])); 1470 ++ifp->if_ierrors; 1471 } 1472 break; 1473 1474 case TERM_REQ: 1475 switch (sp->state[cp->protoidx]) { 1476 case STATE_ACK_RCVD: 1477 case STATE_ACK_SENT: 1478 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1479 /* fall through */ 1480 case STATE_CLOSED: 1481 case STATE_STOPPED: 1482 case STATE_CLOSING: 1483 case STATE_STOPPING: 1484 case STATE_REQ_SENT: 1485 sta: 1486 /* Send Terminate-Ack packet. */ 1487 if (debug) 1488 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1489 ifp->if_xname, cp->name); 1490 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1491 break; 1492 case STATE_OPENED: 1493 (cp->tld)(sp); 1494 sp->rst_counter[cp->protoidx] = 0; 1495 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1496 goto sta; 1497 default: 1498 printf("%s: %s illegal %s in state %s\n", 1499 ifp->if_xname, cp->name, 1500 sppp_cp_type_name(h->type), 1501 sppp_state_name(sp->state[cp->protoidx])); 1502 ++ifp->if_ierrors; 1503 } 1504 break; 1505 case TERM_ACK: 1506 switch (sp->state[cp->protoidx]) { 1507 case STATE_CLOSED: 1508 case STATE_STOPPED: 1509 case STATE_REQ_SENT: 1510 case STATE_ACK_SENT: 1511 break; 1512 case STATE_CLOSING: 1513 (cp->tlf)(sp); 1514 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1515 sppp_lcp_check_and_close(sp); 1516 break; 1517 case STATE_STOPPING: 1518 (cp->tlf)(sp); 1519 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1520 sppp_lcp_check_and_close(sp); 1521 break; 1522 case STATE_ACK_RCVD: 1523 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1524 break; 1525 case STATE_OPENED: 1526 (cp->tld)(sp); 1527 (cp->scr)(sp); 1528 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1529 break; 1530 default: 1531 printf("%s: %s illegal %s in state %s\n", 1532 ifp->if_xname, cp->name, 1533 sppp_cp_type_name(h->type), 1534 sppp_state_name(sp->state[cp->protoidx])); 1535 ++ifp->if_ierrors; 1536 } 1537 break; 1538 case CODE_REJ: 1539 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1540 log(LOG_INFO, 1541 "%s: %s: ignoring RXJ (%s) for code ?, " 1542 "danger will robinson\n", 1543 ifp->if_xname, cp->name, 1544 sppp_cp_type_name(h->type)); 1545 switch (sp->state[cp->protoidx]) { 1546 case STATE_CLOSED: 1547 case STATE_STOPPED: 1548 case STATE_REQ_SENT: 1549 case STATE_ACK_SENT: 1550 case STATE_CLOSING: 1551 case STATE_STOPPING: 1552 case STATE_OPENED: 1553 break; 1554 case STATE_ACK_RCVD: 1555 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1556 break; 1557 default: 1558 printf("%s: %s illegal %s in state %s\n", 1559 ifp->if_xname, cp->name, 1560 sppp_cp_type_name(h->type), 1561 sppp_state_name(sp->state[cp->protoidx])); 1562 ++ifp->if_ierrors; 1563 } 1564 break; 1565 case PROTO_REJ: 1566 { 1567 int catastrophic; 1568 const struct cp *upper; 1569 int i; 1570 uint16_t proto; 1571 1572 catastrophic = 0; 1573 upper = NULL; 1574 proto = p[0] << 8 | p[1]; 1575 for (i = 0; i < IDX_COUNT; i++) { 1576 if (cps[i]->proto == proto) { 1577 upper = cps[i]; 1578 break; 1579 } 1580 } 1581 if (upper == NULL) 1582 catastrophic++; 1583 1584 if (debug) 1585 log(LOG_INFO, 1586 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1587 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1588 sppp_cp_type_name(h->type), proto, 1589 upper ? upper->name : "unknown", 1590 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1591 1592 /* 1593 * if we got RXJ+ against conf-req, the peer does not implement 1594 * this particular protocol type. terminate the protocol. 1595 */ 1596 if (upper && !catastrophic) { 1597 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1598 upper->Close(sp); 1599 break; 1600 } 1601 } 1602 1603 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1604 switch (sp->state[cp->protoidx]) { 1605 case STATE_CLOSED: 1606 case STATE_STOPPED: 1607 case STATE_REQ_SENT: 1608 case STATE_ACK_SENT: 1609 case STATE_CLOSING: 1610 case STATE_STOPPING: 1611 case STATE_OPENED: 1612 break; 1613 case STATE_ACK_RCVD: 1614 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1615 break; 1616 default: 1617 printf("%s: %s illegal %s in state %s\n", 1618 ifp->if_xname, cp->name, 1619 sppp_cp_type_name(h->type), 1620 sppp_state_name(sp->state[cp->protoidx])); 1621 ++ifp->if_ierrors; 1622 } 1623 break; 1624 } 1625 case DISC_REQ: 1626 if (cp->proto != PPP_LCP) 1627 goto illegal; 1628 /* Discard the packet. */ 1629 break; 1630 case ECHO_REQ: 1631 if (cp->proto != PPP_LCP) 1632 goto illegal; 1633 if (sp->state[cp->protoidx] != STATE_OPENED) { 1634 if (debug) 1635 addlog("%s: lcp echo req but lcp closed\n", 1636 ifp->if_xname); 1637 ++ifp->if_ierrors; 1638 break; 1639 } 1640 if (len < 8) { 1641 if (debug) 1642 addlog("%s: invalid lcp echo request " 1643 "packet length: %d bytes\n", 1644 ifp->if_xname, len); 1645 break; 1646 } 1647 memcpy(&u32, h + 1, sizeof u32); 1648 if (ntohl(u32) == sp->lcp.magic) { 1649 /* Line loopback mode detected. */ 1650 printf("%s: loopback\n", ifp->if_xname); 1651 if_down(ifp); 1652 IF_PURGE(&sp->pp_cpq); 1653 1654 /* Shut down the PPP link. */ 1655 /* XXX */ 1656 lcp.Down(sp); 1657 lcp.Up(sp); 1658 break; 1659 } 1660 u32 = htonl(sp->lcp.magic); 1661 memcpy(h + 1, &u32, sizeof u32); 1662 if (debug) 1663 addlog("%s: got lcp echo req, sending echo rep\n", 1664 ifp->if_xname); 1665 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1666 h + 1); 1667 break; 1668 case ECHO_REPLY: 1669 if (cp->proto != PPP_LCP) 1670 goto illegal; 1671 if (h->ident != sp->lcp.echoid) { 1672 ++ifp->if_ierrors; 1673 break; 1674 } 1675 if (len < 8) { 1676 if (debug) 1677 addlog("%s: lcp invalid echo reply " 1678 "packet length: %d bytes\n", 1679 ifp->if_xname, len); 1680 break; 1681 } 1682 if (debug) 1683 addlog("%s: lcp got echo rep\n", 1684 ifp->if_xname); 1685 memcpy(&u32, h + 1, sizeof u32); 1686 if (ntohl(u32) != sp->lcp.magic) 1687 sp->pp_alivecnt = 0; 1688 break; 1689 default: 1690 /* Unknown packet type -- send Code-Reject packet. */ 1691 illegal: 1692 if (debug) 1693 addlog("%s: %s send code-rej for 0x%x\n", 1694 ifp->if_xname, cp->name, h->type); 1695 sppp_cp_send(sp, cp->proto, CODE_REJ, 1696 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1697 ++ifp->if_ierrors; 1698 } 1699 } 1700 1701 1702 /* 1703 * The generic part of all Up/Down/Open/Close/TO event handlers. 1704 * Basically, the state transition handling in the automaton. 1705 */ 1706 static void 1707 sppp_up_event(const struct cp *cp, struct sppp *sp) 1708 { 1709 STDDCL; 1710 1711 if (debug) 1712 log(LOG_DEBUG, "%s: %s up(%s)\n", 1713 ifp->if_xname, cp->name, 1714 sppp_state_name(sp->state[cp->protoidx])); 1715 1716 switch (sp->state[cp->protoidx]) { 1717 case STATE_INITIAL: 1718 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1719 break; 1720 case STATE_STARTING: 1721 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1722 (cp->scr)(sp); 1723 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1724 break; 1725 default: 1726 printf("%s: %s illegal up in state %s\n", 1727 ifp->if_xname, cp->name, 1728 sppp_state_name(sp->state[cp->protoidx])); 1729 } 1730 } 1731 1732 static void 1733 sppp_down_event(const struct cp *cp, struct sppp *sp) 1734 { 1735 STDDCL; 1736 1737 if (debug) 1738 log(LOG_DEBUG, "%s: %s down(%s)\n", 1739 ifp->if_xname, cp->name, 1740 sppp_state_name(sp->state[cp->protoidx])); 1741 1742 switch (sp->state[cp->protoidx]) { 1743 case STATE_CLOSED: 1744 case STATE_CLOSING: 1745 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1746 break; 1747 case STATE_STOPPED: 1748 (cp->tls)(sp); 1749 /* fall through */ 1750 case STATE_STOPPING: 1751 case STATE_REQ_SENT: 1752 case STATE_ACK_RCVD: 1753 case STATE_ACK_SENT: 1754 sppp_cp_change_state(cp, sp, STATE_STARTING); 1755 break; 1756 case STATE_OPENED: 1757 (cp->tld)(sp); 1758 sppp_cp_change_state(cp, sp, STATE_STARTING); 1759 break; 1760 default: 1761 printf("%s: %s illegal down in state %s\n", 1762 ifp->if_xname, cp->name, 1763 sppp_state_name(sp->state[cp->protoidx])); 1764 } 1765 } 1766 1767 1768 static void 1769 sppp_open_event(const struct cp *cp, struct sppp *sp) 1770 { 1771 STDDCL; 1772 1773 if (debug) 1774 log(LOG_DEBUG, "%s: %s open(%s)\n", 1775 ifp->if_xname, cp->name, 1776 sppp_state_name(sp->state[cp->protoidx])); 1777 1778 switch (sp->state[cp->protoidx]) { 1779 case STATE_INITIAL: 1780 sppp_cp_change_state(cp, sp, STATE_STARTING); 1781 (cp->tls)(sp); 1782 break; 1783 case STATE_STARTING: 1784 break; 1785 case STATE_CLOSED: 1786 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1787 (cp->scr)(sp); 1788 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1789 break; 1790 case STATE_STOPPED: 1791 case STATE_STOPPING: 1792 case STATE_REQ_SENT: 1793 case STATE_ACK_RCVD: 1794 case STATE_ACK_SENT: 1795 case STATE_OPENED: 1796 break; 1797 case STATE_CLOSING: 1798 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1799 break; 1800 } 1801 } 1802 1803 1804 static void 1805 sppp_close_event(const struct cp *cp, struct sppp *sp) 1806 { 1807 STDDCL; 1808 1809 if (debug) 1810 log(LOG_DEBUG, "%s: %s close(%s)\n", 1811 ifp->if_xname, cp->name, 1812 sppp_state_name(sp->state[cp->protoidx])); 1813 1814 switch (sp->state[cp->protoidx]) { 1815 case STATE_INITIAL: 1816 case STATE_CLOSED: 1817 case STATE_CLOSING: 1818 break; 1819 case STATE_STARTING: 1820 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1821 (cp->tlf)(sp); 1822 break; 1823 case STATE_STOPPED: 1824 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1825 break; 1826 case STATE_STOPPING: 1827 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1828 break; 1829 case STATE_OPENED: 1830 (cp->tld)(sp); 1831 /* fall through */ 1832 case STATE_REQ_SENT: 1833 case STATE_ACK_RCVD: 1834 case STATE_ACK_SENT: 1835 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1836 sppp_cp_send(sp, cp->proto, TERM_REQ, 1837 ++sp->pp_seq[cp->protoidx], 0, 0); 1838 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1839 break; 1840 } 1841 } 1842 1843 static void 1844 sppp_to_event(const struct cp *cp, struct sppp *sp) 1845 { 1846 STDDCL; 1847 int s; 1848 1849 s = splnet(); 1850 if (debug) 1851 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1852 ifp->if_xname, cp->name, 1853 sppp_state_name(sp->state[cp->protoidx]), 1854 sp->rst_counter[cp->protoidx]); 1855 1856 if (--sp->rst_counter[cp->protoidx] < 0) 1857 /* TO- event */ 1858 switch (sp->state[cp->protoidx]) { 1859 case STATE_CLOSING: 1860 (cp->tlf)(sp); 1861 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1862 sppp_lcp_check_and_close(sp); 1863 break; 1864 case STATE_STOPPING: 1865 (cp->tlf)(sp); 1866 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1867 sppp_lcp_check_and_close(sp); 1868 break; 1869 case STATE_REQ_SENT: 1870 case STATE_ACK_RCVD: 1871 case STATE_ACK_SENT: 1872 (cp->tlf)(sp); 1873 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1874 sppp_lcp_check_and_close(sp); 1875 break; 1876 } 1877 else 1878 /* TO+ event */ 1879 switch (sp->state[cp->protoidx]) { 1880 case STATE_CLOSING: 1881 case STATE_STOPPING: 1882 sppp_cp_send(sp, cp->proto, TERM_REQ, 1883 ++sp->pp_seq[cp->protoidx], 0, 0); 1884 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1885 cp->TO, sp); 1886 break; 1887 case STATE_REQ_SENT: 1888 case STATE_ACK_RCVD: 1889 (cp->scr)(sp); 1890 /* sppp_cp_change_state() will restart the timer */ 1891 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1892 break; 1893 case STATE_ACK_SENT: 1894 (cp->scr)(sp); 1895 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1896 cp->TO, sp); 1897 break; 1898 } 1899 1900 splx(s); 1901 } 1902 1903 /* 1904 * Change the state of a control protocol in the state automaton. 1905 * Takes care of starting/stopping the restart timer. 1906 */ 1907 void 1908 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1909 { 1910 sp->state[cp->protoidx] = newstate; 1911 callout_stop(&sp->ch[cp->protoidx]); 1912 switch (newstate) { 1913 case STATE_INITIAL: 1914 case STATE_STARTING: 1915 case STATE_CLOSED: 1916 case STATE_STOPPED: 1917 case STATE_OPENED: 1918 break; 1919 case STATE_CLOSING: 1920 case STATE_STOPPING: 1921 case STATE_REQ_SENT: 1922 case STATE_ACK_RCVD: 1923 case STATE_ACK_SENT: 1924 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1925 cp->TO, sp); 1926 break; 1927 } 1928 } 1929 1930 /* 1931 *--------------------------------------------------------------------------* 1932 * * 1933 * The LCP implementation. * 1934 * * 1935 *--------------------------------------------------------------------------* 1936 */ 1937 static void 1938 sppp_lcp_init(struct sppp *sp) 1939 { 1940 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1941 sp->lcp.magic = 0; 1942 sp->state[IDX_LCP] = STATE_INITIAL; 1943 sp->fail_counter[IDX_LCP] = 0; 1944 sp->pp_seq[IDX_LCP] = 0; 1945 sp->pp_rseq[IDX_LCP] = 0; 1946 sp->lcp.protos = 0; 1947 1948 /* 1949 * Initialize counters and timeout values. Note that we don't 1950 * use the 3 seconds suggested in RFC 1661 since we are likely 1951 * running on a fast link. XXX We should probably implement 1952 * the exponential backoff option. Note that these values are 1953 * relevant for all control protocols, not just LCP only. 1954 */ 1955 sp->lcp.timeout = 1 * hz; 1956 sp->lcp.max_terminate = 2; 1957 sp->lcp.max_configure = 10; 1958 sp->lcp.max_failure = 10; 1959 callout_init(&sp->ch[IDX_LCP], 0); 1960 } 1961 1962 static void 1963 sppp_lcp_up(struct sppp *sp) 1964 { 1965 STDDCL; 1966 1967 /* Initialize activity timestamp: opening a connection is an activity */ 1968 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 1969 1970 /* 1971 * If this interface is passive or dial-on-demand, and we are 1972 * still in Initial state, it means we've got an incoming 1973 * call. Activate the interface. 1974 */ 1975 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1976 if (debug) 1977 log(LOG_DEBUG, 1978 "%s: Up event", ifp->if_xname); 1979 ifp->if_flags |= IFF_RUNNING; 1980 if (sp->state[IDX_LCP] == STATE_INITIAL) { 1981 if (debug) 1982 addlog("(incoming call)\n"); 1983 sp->pp_flags |= PP_CALLIN; 1984 lcp.Open(sp); 1985 } else if (debug) 1986 addlog("\n"); 1987 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 1988 (sp->state[IDX_LCP] == STATE_INITIAL)) { 1989 ifp->if_flags |= IFF_RUNNING; 1990 lcp.Open(sp); 1991 } 1992 1993 sppp_up_event(&lcp, sp); 1994 } 1995 1996 static void 1997 sppp_lcp_down(struct sppp *sp) 1998 { 1999 STDDCL; 2000 2001 sppp_down_event(&lcp, sp); 2002 2003 /* 2004 * If this is neither a dial-on-demand nor a passive 2005 * interface, simulate an ``ifconfig down'' action, so the 2006 * administrator can force a redial by another ``ifconfig 2007 * up''. XXX For leased line operation, should we immediately 2008 * try to reopen the connection here? 2009 */ 2010 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2011 if (debug) 2012 log(LOG_INFO, 2013 "%s: Down event (carrier loss), taking interface down.\n", 2014 ifp->if_xname); 2015 if_down(ifp); 2016 } else { 2017 if (debug) 2018 log(LOG_DEBUG, 2019 "%s: Down event (carrier loss)\n", 2020 ifp->if_xname); 2021 } 2022 sp->pp_flags &= ~PP_CALLIN; 2023 if (sp->state[IDX_LCP] != STATE_INITIAL) 2024 lcp.Close(sp); 2025 ifp->if_flags &= ~IFF_RUNNING; 2026 } 2027 2028 static void 2029 sppp_lcp_open(struct sppp *sp) 2030 { 2031 if (sp->pp_if.if_mtu < PP_MTU) { 2032 sp->lcp.mru = sp->pp_if.if_mtu; 2033 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2034 } else 2035 sp->lcp.mru = PP_MTU; 2036 sp->lcp.their_mru = PP_MTU; 2037 2038 /* 2039 * If we are authenticator, negotiate LCP_AUTH 2040 */ 2041 if (sp->hisauth.proto != 0) 2042 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2043 else 2044 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2045 sp->pp_flags &= ~PP_NEEDAUTH; 2046 sppp_open_event(&lcp, sp); 2047 } 2048 2049 static void 2050 sppp_lcp_close(struct sppp *sp) 2051 { 2052 sppp_close_event(&lcp, sp); 2053 } 2054 2055 static void 2056 sppp_lcp_TO(void *cookie) 2057 { 2058 sppp_to_event(&lcp, (struct sppp *)cookie); 2059 } 2060 2061 /* 2062 * Analyze a configure request. Return true if it was agreeable, and 2063 * caused action sca, false if it has been rejected or nak'ed, and 2064 * caused action scn. (The return value is used to make the state 2065 * transition decision in the state automaton.) 2066 */ 2067 static int 2068 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2069 { 2070 STDDCL; 2071 u_char *buf, *r, *p; 2072 int origlen, rlen; 2073 uint32_t nmagic; 2074 u_short authproto; 2075 2076 len -= 4; 2077 origlen = len; 2078 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2079 if (! buf) 2080 return (0); 2081 2082 if (debug) 2083 log(LOG_DEBUG, "%s: lcp parse opts:", 2084 ifp->if_xname); 2085 2086 /* pass 1: check for things that need to be rejected */ 2087 p = (void *)(h + 1); 2088 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2089 /* Sanity check option length */ 2090 if (p[1] > len) { 2091 /* 2092 * Malicious option - drop immediately. 2093 * XXX Maybe we should just RXJ it? 2094 */ 2095 addlog("%s: received malicious LCP option 0x%02x, " 2096 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2097 p[0], p[1], len); 2098 goto drop; 2099 } 2100 if (debug) 2101 addlog(" %s", sppp_lcp_opt_name(*p)); 2102 switch (*p) { 2103 case LCP_OPT_MAGIC: 2104 /* Magic number. */ 2105 /* fall through, both are same length */ 2106 case LCP_OPT_ASYNC_MAP: 2107 /* Async control character map. */ 2108 if (len >= 6 || p[1] == 6) 2109 continue; 2110 if (debug) 2111 addlog(" [invalid]"); 2112 break; 2113 case LCP_OPT_MRU: 2114 /* Maximum receive unit. */ 2115 if (len >= 4 && p[1] == 4) 2116 continue; 2117 if (debug) 2118 addlog(" [invalid]"); 2119 break; 2120 case LCP_OPT_AUTH_PROTO: 2121 if (len < 4) { 2122 if (debug) 2123 addlog(" [invalid]"); 2124 break; 2125 } 2126 authproto = (p[2] << 8) + p[3]; 2127 if (authproto == PPP_CHAP && p[1] != 5) { 2128 if (debug) 2129 addlog(" [invalid chap len]"); 2130 break; 2131 } 2132 if (sp->myauth.proto == 0) { 2133 /* we are not configured to do auth */ 2134 if (debug) 2135 addlog(" [not configured]"); 2136 break; 2137 } 2138 /* 2139 * Remote want us to authenticate, remember this, 2140 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2141 * up. 2142 */ 2143 sp->pp_flags |= PP_NEEDAUTH; 2144 continue; 2145 default: 2146 /* Others not supported. */ 2147 if (debug) 2148 addlog(" [rej]"); 2149 break; 2150 } 2151 /* Add the option to rejected list. */ 2152 bcopy (p, r, p[1]); 2153 r += p[1]; 2154 rlen += p[1]; 2155 } 2156 if (rlen) { 2157 if (debug) 2158 addlog(" send conf-rej\n"); 2159 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2160 goto end; 2161 } else if (debug) 2162 addlog("\n"); 2163 2164 /* 2165 * pass 2: check for option values that are unacceptable and 2166 * thus require to be nak'ed. 2167 */ 2168 if (debug) 2169 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2170 ifp->if_xname); 2171 2172 p = (void *)(h + 1); 2173 len = origlen; 2174 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2175 if (debug) 2176 addlog(" %s", sppp_lcp_opt_name(*p)); 2177 switch (*p) { 2178 case LCP_OPT_MAGIC: 2179 /* Magic number -- extract. */ 2180 nmagic = (uint32_t)p[2] << 24 | 2181 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2182 if (nmagic != sp->lcp.magic) { 2183 if (debug) 2184 addlog(" 0x%x", nmagic); 2185 continue; 2186 } 2187 /* 2188 * Local and remote magics equal -- loopback? 2189 */ 2190 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2191 printf ("%s: loopback\n", 2192 ifp->if_xname); 2193 sp->pp_loopcnt = 0; 2194 if (ifp->if_flags & IFF_UP) { 2195 if_down(ifp); 2196 IF_PURGE(&sp->pp_cpq); 2197 /* XXX ? */ 2198 lcp.Down(sp); 2199 lcp.Up(sp); 2200 } 2201 } else if (debug) 2202 addlog(" [glitch]"); 2203 ++sp->pp_loopcnt; 2204 /* 2205 * We negate our magic here, and NAK it. If 2206 * we see it later in an NAK packet, we 2207 * suggest a new one. 2208 */ 2209 nmagic = ~sp->lcp.magic; 2210 /* Gonna NAK it. */ 2211 p[2] = nmagic >> 24; 2212 p[3] = nmagic >> 16; 2213 p[4] = nmagic >> 8; 2214 p[5] = nmagic; 2215 break; 2216 2217 case LCP_OPT_ASYNC_MAP: 2218 /* 2219 * Async control character map -- just ignore it. 2220 * 2221 * Quote from RFC 1662, chapter 6: 2222 * To enable this functionality, synchronous PPP 2223 * implementations MUST always respond to the 2224 * Async-Control-Character-Map Configuration 2225 * Option with the LCP Configure-Ack. However, 2226 * acceptance of the Configuration Option does 2227 * not imply that the synchronous implementation 2228 * will do any ACCM mapping. Instead, all such 2229 * octet mapping will be performed by the 2230 * asynchronous-to-synchronous converter. 2231 */ 2232 continue; 2233 2234 case LCP_OPT_MRU: 2235 /* 2236 * Maximum receive unit. Always agreeable, 2237 * but ignored by now. 2238 */ 2239 sp->lcp.their_mru = p[2] * 256 + p[3]; 2240 if (debug) 2241 addlog(" %ld", sp->lcp.their_mru); 2242 continue; 2243 2244 case LCP_OPT_AUTH_PROTO: 2245 authproto = (p[2] << 8) + p[3]; 2246 if (sp->myauth.proto != authproto) { 2247 /* not agreed, nak */ 2248 if (debug) 2249 addlog(" [mine %s != his %s]", 2250 sppp_proto_name(sp->myauth.proto), 2251 sppp_proto_name(authproto)); 2252 p[2] = sp->myauth.proto >> 8; 2253 p[3] = sp->myauth.proto; 2254 break; 2255 } 2256 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2257 if (debug) 2258 addlog(" [chap not MD5]"); 2259 p[4] = CHAP_MD5; 2260 break; 2261 } 2262 continue; 2263 } 2264 /* Add the option to nak'ed list. */ 2265 bcopy (p, r, p[1]); 2266 r += p[1]; 2267 rlen += p[1]; 2268 } 2269 if (rlen) { 2270 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2271 if (debug) 2272 addlog(" max_failure (%d) exceeded, " 2273 "send conf-rej\n", 2274 sp->lcp.max_failure); 2275 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2276 } else { 2277 if (debug) 2278 addlog(" send conf-nak\n"); 2279 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2280 } 2281 goto end; 2282 } else { 2283 if (debug) 2284 addlog(" send conf-ack\n"); 2285 sp->fail_counter[IDX_LCP] = 0; 2286 sp->pp_loopcnt = 0; 2287 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2288 } 2289 2290 end: 2291 free(buf, M_TEMP); 2292 return (rlen == 0); 2293 2294 drop: 2295 free(buf, M_TEMP); 2296 return -1; 2297 } 2298 2299 /* 2300 * Analyze the LCP Configure-Reject option list, and adjust our 2301 * negotiation. 2302 */ 2303 static void 2304 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2305 { 2306 STDDCL; 2307 u_char *buf, *p; 2308 2309 len -= 4; 2310 buf = malloc (len, M_TEMP, M_NOWAIT); 2311 if (!buf) 2312 return; 2313 2314 if (debug) 2315 log(LOG_DEBUG, "%s: lcp rej opts:", 2316 ifp->if_xname); 2317 2318 p = (void *)(h + 1); 2319 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2320 /* Sanity check option length */ 2321 if (p[1] > len) { 2322 /* 2323 * Malicious option - drop immediately. 2324 * XXX Maybe we should just RXJ it? 2325 */ 2326 addlog("%s: received malicious LCP option, " 2327 "dropping.\n", ifp->if_xname); 2328 goto drop; 2329 } 2330 if (debug) 2331 addlog(" %s", sppp_lcp_opt_name(*p)); 2332 switch (*p) { 2333 case LCP_OPT_MAGIC: 2334 /* Magic number -- can't use it, use 0 */ 2335 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2336 sp->lcp.magic = 0; 2337 break; 2338 case LCP_OPT_MRU: 2339 /* 2340 * We try to negotiate a lower MRU if the underlying 2341 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2342 * peer rejects this lower rate, fallback to the 2343 * default. 2344 */ 2345 if (debug) { 2346 addlog("%s: warning: peer rejected our MRU of " 2347 "%ld bytes. Defaulting to %d bytes\n", 2348 ifp->if_xname, sp->lcp.mru, PP_MTU); 2349 } 2350 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2351 sp->lcp.mru = PP_MTU; 2352 break; 2353 case LCP_OPT_AUTH_PROTO: 2354 /* 2355 * Peer doesn't want to authenticate himself, 2356 * deny unless this is a dialout call, and 2357 * SPPP_AUTHFLAG_NOCALLOUT is set. 2358 */ 2359 if ((sp->pp_flags & PP_CALLIN) == 0 && 2360 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2361 if (debug) 2362 addlog(" [don't insist on auth " 2363 "for callout]"); 2364 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2365 break; 2366 } 2367 if (debug) 2368 addlog("[access denied]\n"); 2369 lcp.Close(sp); 2370 break; 2371 } 2372 } 2373 if (debug) 2374 addlog("\n"); 2375 drop: 2376 free(buf, M_TEMP); 2377 return; 2378 } 2379 2380 /* 2381 * Analyze the LCP Configure-NAK option list, and adjust our 2382 * negotiation. 2383 */ 2384 static void 2385 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2386 { 2387 STDDCL; 2388 u_char *buf, *p; 2389 uint32_t magic; 2390 2391 len -= 4; 2392 buf = malloc (len, M_TEMP, M_NOWAIT); 2393 if (!buf) 2394 return; 2395 2396 if (debug) 2397 log(LOG_DEBUG, "%s: lcp nak opts:", 2398 ifp->if_xname); 2399 2400 p = (void *)(h + 1); 2401 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2402 /* Sanity check option length */ 2403 if (p[1] > len) { 2404 /* 2405 * Malicious option - drop immediately. 2406 * XXX Maybe we should just RXJ it? 2407 */ 2408 addlog("%s: received malicious LCP option, " 2409 "dropping.\n", ifp->if_xname); 2410 goto drop; 2411 } 2412 if (debug) 2413 addlog(" %s", sppp_lcp_opt_name(*p)); 2414 switch (*p) { 2415 case LCP_OPT_MAGIC: 2416 /* Magic number -- renegotiate */ 2417 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2418 len >= 6 && p[1] == 6) { 2419 magic = (uint32_t)p[2] << 24 | 2420 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2421 /* 2422 * If the remote magic is our negated one, 2423 * this looks like a loopback problem. 2424 * Suggest a new magic to make sure. 2425 */ 2426 if (magic == ~sp->lcp.magic) { 2427 if (debug) 2428 addlog(" magic glitch"); 2429 sp->lcp.magic = cprng_fast32(); 2430 } else { 2431 sp->lcp.magic = magic; 2432 if (debug) 2433 addlog(" %d", magic); 2434 } 2435 } 2436 break; 2437 case LCP_OPT_MRU: 2438 /* 2439 * Peer wants to advise us to negotiate an MRU. 2440 * Agree on it if it's reasonable, or use 2441 * default otherwise. 2442 */ 2443 if (len >= 4 && p[1] == 4) { 2444 u_int mru = p[2] * 256 + p[3]; 2445 if (debug) 2446 addlog(" %d", mru); 2447 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2448 mru = sp->pp_if.if_mtu; 2449 sp->lcp.mru = mru; 2450 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2451 } 2452 break; 2453 case LCP_OPT_AUTH_PROTO: 2454 /* 2455 * Peer doesn't like our authentication method, 2456 * deny. 2457 */ 2458 if (debug) 2459 addlog("[access denied]\n"); 2460 lcp.Close(sp); 2461 break; 2462 } 2463 } 2464 if (debug) 2465 addlog("\n"); 2466 drop: 2467 free(buf, M_TEMP); 2468 return; 2469 } 2470 2471 static void 2472 sppp_lcp_tlu(struct sppp *sp) 2473 { 2474 STDDCL; 2475 int i; 2476 uint32_t mask; 2477 2478 /* XXX ? */ 2479 if (! (ifp->if_flags & IFF_UP) && 2480 (ifp->if_flags & IFF_RUNNING)) { 2481 /* Coming out of loopback mode. */ 2482 if_up(ifp); 2483 } 2484 2485 for (i = 0; i < IDX_COUNT; i++) 2486 if ((cps[i])->flags & CP_QUAL) 2487 (cps[i])->Open(sp); 2488 2489 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2490 (sp->pp_flags & PP_NEEDAUTH) != 0) 2491 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2492 else 2493 sp->pp_phase = SPPP_PHASE_NETWORK; 2494 2495 if (debug) 2496 { 2497 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2498 sppp_phase_name(sp->pp_phase)); 2499 } 2500 2501 /* 2502 * Open all authentication protocols. This is even required 2503 * if we already proceeded to network phase, since it might be 2504 * that remote wants us to authenticate, so we might have to 2505 * send a PAP request. Undesired authentication protocols 2506 * don't do anything when they get an Open event. 2507 */ 2508 for (i = 0; i < IDX_COUNT; i++) 2509 if ((cps[i])->flags & CP_AUTH) 2510 (cps[i])->Open(sp); 2511 2512 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2513 /* Notify all NCPs. */ 2514 for (i = 0; i < IDX_COUNT; i++) 2515 if ((cps[i])->flags & CP_NCP) 2516 (cps[i])->Open(sp); 2517 } 2518 2519 /* Send Up events to all started protos. */ 2520 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2521 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2522 (cps[i])->Up(sp); 2523 2524 /* notify low-level driver of state change */ 2525 if (sp->pp_chg) 2526 sp->pp_chg(sp, (int)sp->pp_phase); 2527 2528 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2529 /* if no NCP is starting, close down */ 2530 sppp_lcp_check_and_close(sp); 2531 } 2532 2533 static void 2534 sppp_lcp_tld(struct sppp *sp) 2535 { 2536 STDDCL; 2537 int i; 2538 uint32_t mask; 2539 2540 sp->pp_phase = SPPP_PHASE_TERMINATE; 2541 2542 if (debug) 2543 { 2544 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2545 sppp_phase_name(sp->pp_phase)); 2546 } 2547 2548 /* 2549 * Take upper layers down. We send the Down event first and 2550 * the Close second to prevent the upper layers from sending 2551 * ``a flurry of terminate-request packets'', as the RFC 2552 * describes it. 2553 */ 2554 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2555 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2556 (cps[i])->Down(sp); 2557 (cps[i])->Close(sp); 2558 } 2559 } 2560 2561 static void 2562 sppp_lcp_tls(struct sppp *sp) 2563 { 2564 STDDCL; 2565 2566 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2567 printf("%s: authentication failed %d times, not retrying again\n", 2568 sp->pp_if.if_xname, sp->pp_auth_failures); 2569 if_down(&sp->pp_if); 2570 return; 2571 } 2572 2573 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2574 2575 if (debug) 2576 { 2577 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2578 sppp_phase_name(sp->pp_phase)); 2579 } 2580 2581 /* Notify lower layer if desired. */ 2582 if (sp->pp_tls) 2583 (sp->pp_tls)(sp); 2584 } 2585 2586 static void 2587 sppp_lcp_tlf(struct sppp *sp) 2588 { 2589 STDDCL; 2590 2591 sp->pp_phase = SPPP_PHASE_DEAD; 2592 2593 if (debug) 2594 { 2595 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2596 sppp_phase_name(sp->pp_phase)); 2597 } 2598 2599 /* Notify lower layer if desired. */ 2600 if (sp->pp_tlf) 2601 (sp->pp_tlf)(sp); 2602 } 2603 2604 static void 2605 sppp_lcp_scr(struct sppp *sp) 2606 { 2607 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2608 int i = 0; 2609 u_short authproto; 2610 2611 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2612 if (! sp->lcp.magic) 2613 sp->lcp.magic = cprng_fast32(); 2614 opt[i++] = LCP_OPT_MAGIC; 2615 opt[i++] = 6; 2616 opt[i++] = sp->lcp.magic >> 24; 2617 opt[i++] = sp->lcp.magic >> 16; 2618 opt[i++] = sp->lcp.magic >> 8; 2619 opt[i++] = sp->lcp.magic; 2620 } 2621 2622 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2623 opt[i++] = LCP_OPT_MRU; 2624 opt[i++] = 4; 2625 opt[i++] = sp->lcp.mru >> 8; 2626 opt[i++] = sp->lcp.mru; 2627 } 2628 2629 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2630 authproto = sp->hisauth.proto; 2631 opt[i++] = LCP_OPT_AUTH_PROTO; 2632 opt[i++] = authproto == PPP_CHAP? 5: 4; 2633 opt[i++] = authproto >> 8; 2634 opt[i++] = authproto; 2635 if (authproto == PPP_CHAP) 2636 opt[i++] = CHAP_MD5; 2637 } 2638 2639 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2640 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2641 } 2642 2643 /* 2644 * Check the open NCPs, return true if at least one NCP is open. 2645 */ 2646 static int 2647 sppp_ncp_check(struct sppp *sp) 2648 { 2649 int i, mask; 2650 2651 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2652 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2653 return 1; 2654 return 0; 2655 } 2656 2657 /* 2658 * Re-check the open NCPs and see if we should terminate the link. 2659 * Called by the NCPs during their tlf action handling. 2660 */ 2661 static void 2662 sppp_lcp_check_and_close(struct sppp *sp) 2663 { 2664 2665 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2666 /* don't bother, we are already going down */ 2667 return; 2668 2669 if (sppp_ncp_check(sp)) 2670 return; 2671 2672 lcp.Close(sp); 2673 } 2674 2675 2676 /* 2677 *--------------------------------------------------------------------------* 2678 * * 2679 * The IPCP implementation. * 2680 * * 2681 *--------------------------------------------------------------------------* 2682 */ 2683 2684 static void 2685 sppp_ipcp_init(struct sppp *sp) 2686 { 2687 sp->ipcp.opts = 0; 2688 sp->ipcp.flags = 0; 2689 sp->state[IDX_IPCP] = STATE_INITIAL; 2690 sp->fail_counter[IDX_IPCP] = 0; 2691 sp->pp_seq[IDX_IPCP] = 0; 2692 sp->pp_rseq[IDX_IPCP] = 0; 2693 callout_init(&sp->ch[IDX_IPCP], 0); 2694 } 2695 2696 static void 2697 sppp_ipcp_up(struct sppp *sp) 2698 { 2699 sppp_up_event(&ipcp, sp); 2700 } 2701 2702 static void 2703 sppp_ipcp_down(struct sppp *sp) 2704 { 2705 sppp_down_event(&ipcp, sp); 2706 } 2707 2708 static void 2709 sppp_ipcp_open(struct sppp *sp) 2710 { 2711 STDDCL; 2712 uint32_t myaddr, hisaddr; 2713 2714 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2715 sp->ipcp.req_myaddr = 0; 2716 sp->ipcp.req_hisaddr = 0; 2717 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2718 2719 #ifdef INET 2720 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2721 #else 2722 myaddr = hisaddr = 0; 2723 #endif 2724 /* 2725 * If we don't have his address, this probably means our 2726 * interface doesn't want to talk IP at all. (This could 2727 * be the case if somebody wants to speak only IPX, for 2728 * example.) Don't open IPCP in this case. 2729 */ 2730 if (hisaddr == 0) { 2731 /* XXX this message should go away */ 2732 if (debug) 2733 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2734 ifp->if_xname); 2735 return; 2736 } 2737 2738 if (myaddr == 0) { 2739 /* 2740 * I don't have an assigned address, so i need to 2741 * negotiate my address. 2742 */ 2743 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2744 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2745 } 2746 if (hisaddr == 1) { 2747 /* 2748 * XXX - remove this hack! 2749 * remote has no valid address, we need to get one assigned. 2750 */ 2751 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2752 } 2753 sppp_open_event(&ipcp, sp); 2754 } 2755 2756 static void 2757 sppp_ipcp_close(struct sppp *sp) 2758 { 2759 STDDCL; 2760 2761 sppp_close_event(&ipcp, sp); 2762 #ifdef INET 2763 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2764 /* 2765 * Some address was dynamic, clear it again. 2766 */ 2767 sppp_clear_ip_addrs(sp); 2768 #endif 2769 2770 if (sp->pp_saved_mtu > 0) { 2771 ifp->if_mtu = sp->pp_saved_mtu; 2772 sp->pp_saved_mtu = 0; 2773 if (debug) 2774 log(LOG_DEBUG, 2775 "%s: resetting MTU to %" PRIu64 " bytes\n", 2776 ifp->if_xname, ifp->if_mtu); 2777 } 2778 } 2779 2780 static void 2781 sppp_ipcp_TO(void *cookie) 2782 { 2783 sppp_to_event(&ipcp, (struct sppp *)cookie); 2784 } 2785 2786 /* 2787 * Analyze a configure request. Return true if it was agreeable, and 2788 * caused action sca, false if it has been rejected or nak'ed, and 2789 * caused action scn. (The return value is used to make the state 2790 * transition decision in the state automaton.) 2791 */ 2792 static int 2793 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2794 { 2795 u_char *buf, *r, *p; 2796 struct ifnet *ifp = &sp->pp_if; 2797 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2798 uint32_t hisaddr, desiredaddr; 2799 2800 len -= 4; 2801 origlen = len; 2802 /* 2803 * Make sure to allocate a buf that can at least hold a 2804 * conf-nak with an `address' option. We might need it below. 2805 */ 2806 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2807 if (! buf) 2808 return (0); 2809 2810 /* pass 1: see if we can recognize them */ 2811 if (debug) 2812 log(LOG_DEBUG, "%s: ipcp parse opts:", 2813 ifp->if_xname); 2814 p = (void *)(h + 1); 2815 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2816 /* Sanity check option length */ 2817 if (p[1] > len) { 2818 /* XXX should we just RXJ? */ 2819 addlog("%s: malicious IPCP option received, dropping\n", 2820 ifp->if_xname); 2821 goto drop; 2822 } 2823 if (debug) 2824 addlog(" %s", sppp_ipcp_opt_name(*p)); 2825 switch (*p) { 2826 #ifdef notyet 2827 case IPCP_OPT_COMPRESSION: 2828 if (len >= 6 && p[1] >= 6) { 2829 /* correctly formed compress option */ 2830 continue; 2831 } 2832 if (debug) 2833 addlog(" [invalid]"); 2834 break; 2835 #endif 2836 case IPCP_OPT_ADDRESS: 2837 if (len >= 6 && p[1] == 6) { 2838 /* correctly formed address option */ 2839 continue; 2840 } 2841 if (debug) 2842 addlog(" [invalid]"); 2843 break; 2844 default: 2845 /* Others not supported. */ 2846 if (debug) 2847 addlog(" [rej]"); 2848 break; 2849 } 2850 /* Add the option to rejected list. */ 2851 bcopy (p, r, p[1]); 2852 r += p[1]; 2853 rlen += p[1]; 2854 } 2855 if (rlen) { 2856 if (debug) 2857 addlog(" send conf-rej\n"); 2858 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2859 goto end; 2860 } else if (debug) 2861 addlog("\n"); 2862 2863 /* pass 2: parse option values */ 2864 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2865 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2866 else 2867 #ifdef INET 2868 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2869 #else 2870 hisaddr = 0; 2871 #endif 2872 if (debug) 2873 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2874 ifp->if_xname); 2875 p = (void *)(h + 1); 2876 len = origlen; 2877 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2878 if (debug) 2879 addlog(" %s", sppp_ipcp_opt_name(*p)); 2880 switch (*p) { 2881 #ifdef notyet 2882 case IPCP_OPT_COMPRESSION: 2883 continue; 2884 #endif 2885 case IPCP_OPT_ADDRESS: 2886 desiredaddr = p[2] << 24 | p[3] << 16 | 2887 p[4] << 8 | p[5]; 2888 if (desiredaddr == hisaddr || 2889 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2890 /* 2891 * Peer's address is same as our value, 2892 * this is agreeable. Gonna conf-ack 2893 * it. 2894 */ 2895 if (debug) 2896 addlog(" %s [ack]", 2897 sppp_dotted_quad(hisaddr)); 2898 /* record that we've seen it already */ 2899 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2900 sp->ipcp.req_hisaddr = desiredaddr; 2901 hisaddr = desiredaddr; 2902 continue; 2903 } 2904 /* 2905 * The address wasn't agreeable. This is either 2906 * he sent us 0.0.0.0, asking to assign him an 2907 * address, or he send us another address not 2908 * matching our value. Either case, we gonna 2909 * conf-nak it with our value. 2910 */ 2911 if (debug) { 2912 if (desiredaddr == 0) 2913 addlog(" [addr requested]"); 2914 else 2915 addlog(" %s [not agreed]", 2916 sppp_dotted_quad(desiredaddr)); 2917 } 2918 2919 p[2] = hisaddr >> 24; 2920 p[3] = hisaddr >> 16; 2921 p[4] = hisaddr >> 8; 2922 p[5] = hisaddr; 2923 break; 2924 } 2925 /* Add the option to nak'ed list. */ 2926 bcopy (p, r, p[1]); 2927 r += p[1]; 2928 rlen += p[1]; 2929 } 2930 2931 /* 2932 * If we are about to conf-ack the request, but haven't seen 2933 * his address so far, gonna conf-nak it instead, with the 2934 * `address' option present and our idea of his address being 2935 * filled in there, to request negotiation of both addresses. 2936 * 2937 * XXX This can result in an endless req - nak loop if peer 2938 * doesn't want to send us his address. Q: What should we do 2939 * about it? XXX A: implement the max-failure counter. 2940 */ 2941 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2942 buf[0] = IPCP_OPT_ADDRESS; 2943 buf[1] = 6; 2944 buf[2] = hisaddr >> 24; 2945 buf[3] = hisaddr >> 16; 2946 buf[4] = hisaddr >> 8; 2947 buf[5] = hisaddr; 2948 rlen = 6; 2949 if (debug) 2950 addlog(" still need hisaddr"); 2951 } 2952 2953 if (rlen) { 2954 if (debug) 2955 addlog(" send conf-nak\n"); 2956 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2957 } else { 2958 if (debug) 2959 addlog(" send conf-ack\n"); 2960 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2961 } 2962 2963 end: 2964 free(buf, M_TEMP); 2965 return (rlen == 0); 2966 2967 drop: 2968 free(buf, M_TEMP); 2969 return -1; 2970 } 2971 2972 /* 2973 * Analyze the IPCP Configure-Reject option list, and adjust our 2974 * negotiation. 2975 */ 2976 static void 2977 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2978 { 2979 u_char *buf, *p; 2980 struct ifnet *ifp = &sp->pp_if; 2981 int debug = ifp->if_flags & IFF_DEBUG; 2982 2983 len -= 4; 2984 buf = malloc (len, M_TEMP, M_NOWAIT); 2985 if (!buf) 2986 return; 2987 2988 if (debug) 2989 log(LOG_DEBUG, "%s: ipcp rej opts:", 2990 ifp->if_xname); 2991 2992 p = (void *)(h + 1); 2993 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2994 /* Sanity check option length */ 2995 if (p[1] > len) { 2996 /* XXX should we just RXJ? */ 2997 addlog("%s: malicious IPCP option received, dropping\n", 2998 ifp->if_xname); 2999 goto drop; 3000 } 3001 if (debug) 3002 addlog(" %s", sppp_ipcp_opt_name(*p)); 3003 switch (*p) { 3004 case IPCP_OPT_ADDRESS: 3005 /* 3006 * Peer doesn't grok address option. This is 3007 * bad. XXX Should we better give up here? 3008 */ 3009 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3010 break; 3011 #ifdef notyet 3012 case IPCP_OPT_COMPRESS: 3013 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3014 break; 3015 #endif 3016 } 3017 } 3018 if (debug) 3019 addlog("\n"); 3020 drop: 3021 free(buf, M_TEMP); 3022 return; 3023 } 3024 3025 /* 3026 * Analyze the IPCP Configure-NAK option list, and adjust our 3027 * negotiation. 3028 */ 3029 static void 3030 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3031 { 3032 u_char *p; 3033 struct ifnet *ifp = &sp->pp_if; 3034 int debug = ifp->if_flags & IFF_DEBUG; 3035 uint32_t wantaddr; 3036 3037 len -= 4; 3038 3039 if (debug) 3040 log(LOG_DEBUG, "%s: ipcp nak opts:", 3041 ifp->if_xname); 3042 3043 p = (void *)(h + 1); 3044 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3045 /* Sanity check option length */ 3046 if (p[1] > len) { 3047 /* XXX should we just RXJ? */ 3048 addlog("%s: malicious IPCP option received, dropping\n", 3049 ifp->if_xname); 3050 return; 3051 } 3052 if (debug) 3053 addlog(" %s", sppp_ipcp_opt_name(*p)); 3054 switch (*p) { 3055 case IPCP_OPT_ADDRESS: 3056 /* 3057 * Peer doesn't like our local IP address. See 3058 * if we can do something for him. We'll drop 3059 * him our address then. 3060 */ 3061 if (len >= 6 && p[1] == 6) { 3062 wantaddr = p[2] << 24 | p[3] << 16 | 3063 p[4] << 8 | p[5]; 3064 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3065 if (debug) 3066 addlog(" [wantaddr %s]", 3067 sppp_dotted_quad(wantaddr)); 3068 /* 3069 * When doing dynamic address assignment, 3070 * we accept his offer. Otherwise, we 3071 * ignore it and thus continue to negotiate 3072 * our already existing value. 3073 */ 3074 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3075 if (debug) 3076 addlog(" [agree]"); 3077 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3078 sp->ipcp.req_myaddr = wantaddr; 3079 } 3080 } 3081 break; 3082 3083 case IPCP_OPT_PRIMDNS: 3084 if (len >= 6 && p[1] == 6) { 3085 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3086 p[4] << 8 | p[5]; 3087 } 3088 break; 3089 3090 case IPCP_OPT_SECDNS: 3091 if (len >= 6 && p[1] == 6) { 3092 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3093 p[4] << 8 | p[5]; 3094 } 3095 break; 3096 #ifdef notyet 3097 case IPCP_OPT_COMPRESS: 3098 /* 3099 * Peer wants different compression parameters. 3100 */ 3101 break; 3102 #endif 3103 } 3104 } 3105 if (debug) 3106 addlog("\n"); 3107 } 3108 3109 static void 3110 sppp_ipcp_tlu(struct sppp *sp) 3111 { 3112 #ifdef INET 3113 /* we are up. Set addresses and notify anyone interested */ 3114 STDDCL; 3115 uint32_t myaddr, hisaddr; 3116 3117 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3118 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3119 myaddr = sp->ipcp.req_myaddr; 3120 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3121 hisaddr = sp->ipcp.req_hisaddr; 3122 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3123 3124 if (ifp->if_mtu > sp->lcp.their_mru) { 3125 sp->pp_saved_mtu = ifp->if_mtu; 3126 ifp->if_mtu = sp->lcp.their_mru; 3127 if (debug) 3128 log(LOG_DEBUG, 3129 "%s: setting MTU to %" PRIu64 " bytes\n", 3130 ifp->if_xname, ifp->if_mtu); 3131 } 3132 3133 if (sp->pp_con) 3134 sp->pp_con(sp); 3135 #endif 3136 } 3137 3138 static void 3139 sppp_ipcp_tld(struct sppp *sp) 3140 { 3141 } 3142 3143 static void 3144 sppp_ipcp_tls(struct sppp *sp) 3145 { 3146 /* indicate to LCP that it must stay alive */ 3147 sp->lcp.protos |= (1 << IDX_IPCP); 3148 } 3149 3150 static void 3151 sppp_ipcp_tlf(struct sppp *sp) 3152 { 3153 /* we no longer need LCP */ 3154 sp->lcp.protos &= ~(1 << IDX_IPCP); 3155 } 3156 3157 static void 3158 sppp_ipcp_scr(struct sppp *sp) 3159 { 3160 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3161 #ifdef INET 3162 uint32_t ouraddr; 3163 #endif 3164 int i = 0; 3165 3166 #ifdef notyet 3167 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3168 opt[i++] = IPCP_OPT_COMPRESSION; 3169 opt[i++] = 6; 3170 opt[i++] = 0; /* VJ header compression */ 3171 opt[i++] = 0x2d; /* VJ header compression */ 3172 opt[i++] = max_slot_id; 3173 opt[i++] = comp_slot_id; 3174 } 3175 #endif 3176 3177 #ifdef INET 3178 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3179 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3180 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3181 else 3182 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3183 opt[i++] = IPCP_OPT_ADDRESS; 3184 opt[i++] = 6; 3185 opt[i++] = ouraddr >> 24; 3186 opt[i++] = ouraddr >> 16; 3187 opt[i++] = ouraddr >> 8; 3188 opt[i++] = ouraddr; 3189 } 3190 #endif 3191 3192 if (sp->query_dns & 1) { 3193 opt[i++] = IPCP_OPT_PRIMDNS; 3194 opt[i++] = 6; 3195 opt[i++] = sp->dns_addrs[0] >> 24; 3196 opt[i++] = sp->dns_addrs[0] >> 16; 3197 opt[i++] = sp->dns_addrs[0] >> 8; 3198 opt[i++] = sp->dns_addrs[0]; 3199 } 3200 if (sp->query_dns & 2) { 3201 opt[i++] = IPCP_OPT_SECDNS; 3202 opt[i++] = 6; 3203 opt[i++] = sp->dns_addrs[1] >> 24; 3204 opt[i++] = sp->dns_addrs[1] >> 16; 3205 opt[i++] = sp->dns_addrs[1] >> 8; 3206 opt[i++] = sp->dns_addrs[1]; 3207 } 3208 3209 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3210 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3211 } 3212 3213 3214 /* 3215 *--------------------------------------------------------------------------* 3216 * * 3217 * The IPv6CP implementation. * 3218 * * 3219 *--------------------------------------------------------------------------* 3220 */ 3221 3222 #ifdef INET6 3223 static void 3224 sppp_ipv6cp_init(struct sppp *sp) 3225 { 3226 sp->ipv6cp.opts = 0; 3227 sp->ipv6cp.flags = 0; 3228 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3229 sp->fail_counter[IDX_IPV6CP] = 0; 3230 sp->pp_seq[IDX_IPV6CP] = 0; 3231 sp->pp_rseq[IDX_IPV6CP] = 0; 3232 callout_init(&sp->ch[IDX_IPV6CP], 0); 3233 } 3234 3235 static void 3236 sppp_ipv6cp_up(struct sppp *sp) 3237 { 3238 sppp_up_event(&ipv6cp, sp); 3239 } 3240 3241 static void 3242 sppp_ipv6cp_down(struct sppp *sp) 3243 { 3244 sppp_down_event(&ipv6cp, sp); 3245 } 3246 3247 static void 3248 sppp_ipv6cp_open(struct sppp *sp) 3249 { 3250 STDDCL; 3251 struct in6_addr myaddr, hisaddr; 3252 3253 #ifdef IPV6CP_MYIFID_DYN 3254 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3255 #else 3256 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3257 #endif 3258 3259 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3260 /* 3261 * If we don't have our address, this probably means our 3262 * interface doesn't want to talk IPv6 at all. (This could 3263 * be the case if somebody wants to speak only IPX, for 3264 * example.) Don't open IPv6CP in this case. 3265 */ 3266 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3267 /* XXX this message should go away */ 3268 if (debug) 3269 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3270 ifp->if_xname); 3271 return; 3272 } 3273 3274 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3275 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3276 sppp_open_event(&ipv6cp, sp); 3277 } 3278 3279 static void 3280 sppp_ipv6cp_close(struct sppp *sp) 3281 { 3282 sppp_close_event(&ipv6cp, sp); 3283 } 3284 3285 static void 3286 sppp_ipv6cp_TO(void *cookie) 3287 { 3288 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3289 } 3290 3291 /* 3292 * Analyze a configure request. Return true if it was agreeable, and 3293 * caused action sca, false if it has been rejected or nak'ed, and 3294 * caused action scn. (The return value is used to make the state 3295 * transition decision in the state automaton.) 3296 */ 3297 static int 3298 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3299 { 3300 u_char *buf, *r, *p; 3301 struct ifnet *ifp = &sp->pp_if; 3302 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3303 struct in6_addr myaddr, desiredaddr, suggestaddr; 3304 int ifidcount; 3305 int type; 3306 int collision, nohisaddr; 3307 3308 len -= 4; 3309 origlen = len; 3310 /* 3311 * Make sure to allocate a buf that can at least hold a 3312 * conf-nak with an `address' option. We might need it below. 3313 */ 3314 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3315 if (! buf) 3316 return (0); 3317 3318 /* pass 1: see if we can recognize them */ 3319 if (debug) 3320 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3321 ifp->if_xname); 3322 p = (void *)(h + 1); 3323 ifidcount = 0; 3324 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3325 /* Sanity check option length */ 3326 if (p[1] > len) { 3327 /* XXX just RXJ? */ 3328 addlog("%s: received malicious IPCPv6 option, " 3329 "dropping\n", ifp->if_xname); 3330 goto drop; 3331 } 3332 if (debug) 3333 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3334 switch (*p) { 3335 case IPV6CP_OPT_IFID: 3336 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3337 /* correctly formed address option */ 3338 ifidcount++; 3339 continue; 3340 } 3341 if (debug) 3342 addlog(" [invalid]"); 3343 break; 3344 #ifdef notyet 3345 case IPV6CP_OPT_COMPRESSION: 3346 if (len >= 4 && p[1] >= 4) { 3347 /* correctly formed compress option */ 3348 continue; 3349 } 3350 if (debug) 3351 addlog(" [invalid]"); 3352 break; 3353 #endif 3354 default: 3355 /* Others not supported. */ 3356 if (debug) 3357 addlog(" [rej]"); 3358 break; 3359 } 3360 /* Add the option to rejected list. */ 3361 bcopy (p, r, p[1]); 3362 r += p[1]; 3363 rlen += p[1]; 3364 } 3365 if (rlen) { 3366 if (debug) 3367 addlog(" send conf-rej\n"); 3368 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3369 goto end; 3370 } else if (debug) 3371 addlog("\n"); 3372 3373 /* pass 2: parse option values */ 3374 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3375 if (debug) 3376 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3377 ifp->if_xname); 3378 p = (void *)(h + 1); 3379 len = origlen; 3380 type = CONF_ACK; 3381 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3382 if (debug) 3383 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3384 switch (*p) { 3385 #ifdef notyet 3386 case IPV6CP_OPT_COMPRESSION: 3387 continue; 3388 #endif 3389 case IPV6CP_OPT_IFID: 3390 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3391 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3392 collision = (memcmp(&desiredaddr.s6_addr[8], 3393 &myaddr.s6_addr[8], 8) == 0); 3394 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3395 3396 desiredaddr.s6_addr16[0] = htons(0xfe80); 3397 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3398 3399 if (!collision && !nohisaddr) { 3400 /* no collision, hisaddr known - Conf-Ack */ 3401 type = CONF_ACK; 3402 3403 if (debug) { 3404 addlog(" %s [%s]", 3405 ip6_sprintf(&desiredaddr), 3406 sppp_cp_type_name(type)); 3407 } 3408 continue; 3409 } 3410 3411 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3412 if (collision && nohisaddr) { 3413 /* collision, hisaddr unknown - Conf-Rej */ 3414 type = CONF_REJ; 3415 memset(&p[2], 0, 8); 3416 } else { 3417 /* 3418 * - no collision, hisaddr unknown, or 3419 * - collision, hisaddr known 3420 * Conf-Nak, suggest hisaddr 3421 */ 3422 type = CONF_NAK; 3423 sppp_suggest_ip6_addr(sp, &suggestaddr); 3424 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3425 } 3426 if (debug) 3427 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3428 sppp_cp_type_name(type)); 3429 break; 3430 } 3431 /* Add the option to nak'ed list. */ 3432 bcopy (p, r, p[1]); 3433 r += p[1]; 3434 rlen += p[1]; 3435 } 3436 3437 if (rlen == 0 && type == CONF_ACK) { 3438 if (debug) 3439 addlog(" send %s\n", sppp_cp_type_name(type)); 3440 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3441 } else { 3442 #ifdef notdef 3443 if (type == CONF_ACK) 3444 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3445 #endif 3446 3447 if (debug) { 3448 addlog(" send %s suggest %s\n", 3449 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3450 } 3451 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3452 } 3453 3454 end: 3455 free(buf, M_TEMP); 3456 return (rlen == 0); 3457 3458 drop: 3459 free(buf, M_TEMP); 3460 return -1; 3461 } 3462 3463 /* 3464 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3465 * negotiation. 3466 */ 3467 static void 3468 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3469 { 3470 u_char *buf, *p; 3471 struct ifnet *ifp = &sp->pp_if; 3472 int debug = ifp->if_flags & IFF_DEBUG; 3473 3474 len -= 4; 3475 buf = malloc (len, M_TEMP, M_NOWAIT); 3476 if (!buf) 3477 return; 3478 3479 if (debug) 3480 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3481 ifp->if_xname); 3482 3483 p = (void *)(h + 1); 3484 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3485 if (p[1] > len) { 3486 /* XXX just RXJ? */ 3487 addlog("%s: received malicious IPCPv6 option, " 3488 "dropping\n", ifp->if_xname); 3489 goto drop; 3490 } 3491 if (debug) 3492 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3493 switch (*p) { 3494 case IPV6CP_OPT_IFID: 3495 /* 3496 * Peer doesn't grok address option. This is 3497 * bad. XXX Should we better give up here? 3498 */ 3499 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3500 break; 3501 #ifdef notyet 3502 case IPV6CP_OPT_COMPRESS: 3503 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3504 break; 3505 #endif 3506 } 3507 } 3508 if (debug) 3509 addlog("\n"); 3510 drop: 3511 free(buf, M_TEMP); 3512 return; 3513 } 3514 3515 /* 3516 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3517 * negotiation. 3518 */ 3519 static void 3520 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3521 { 3522 u_char *buf, *p; 3523 struct ifnet *ifp = &sp->pp_if; 3524 int debug = ifp->if_flags & IFF_DEBUG; 3525 struct in6_addr suggestaddr; 3526 3527 len -= 4; 3528 buf = malloc (len, M_TEMP, M_NOWAIT); 3529 if (!buf) 3530 return; 3531 3532 if (debug) 3533 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3534 ifp->if_xname); 3535 3536 p = (void *)(h + 1); 3537 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3538 if (p[1] > len) { 3539 /* XXX just RXJ? */ 3540 addlog("%s: received malicious IPCPv6 option, " 3541 "dropping\n", ifp->if_xname); 3542 goto drop; 3543 } 3544 if (debug) 3545 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3546 switch (*p) { 3547 case IPV6CP_OPT_IFID: 3548 /* 3549 * Peer doesn't like our local ifid. See 3550 * if we can do something for him. We'll drop 3551 * him our address then. 3552 */ 3553 if (len < 10 || p[1] != 10) 3554 break; 3555 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3556 suggestaddr.s6_addr16[0] = htons(0xfe80); 3557 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3558 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3559 3560 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3561 if (debug) 3562 addlog(" [suggestaddr %s]", 3563 ip6_sprintf(&suggestaddr)); 3564 #ifdef IPV6CP_MYIFID_DYN 3565 /* 3566 * When doing dynamic address assignment, 3567 * we accept his offer. 3568 */ 3569 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3570 struct in6_addr lastsuggest; 3571 /* 3572 * If <suggested myaddr from peer> equals to 3573 * <hisaddr we have suggested last time>, 3574 * we have a collision. generate new random 3575 * ifid. 3576 */ 3577 sppp_suggest_ip6_addr(&lastsuggest); 3578 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3579 lastsuggest)) { 3580 if (debug) 3581 addlog(" [random]"); 3582 sppp_gen_ip6_addr(sp, &suggestaddr); 3583 } 3584 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3585 if (debug) 3586 addlog(" [agree]"); 3587 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3588 } 3589 #else 3590 /* 3591 * Since we do not do dynamic address assignment, 3592 * we ignore it and thus continue to negotiate 3593 * our already existing value. This can possibly 3594 * go into infinite request-reject loop. 3595 * 3596 * This is not likely because we normally use 3597 * ifid based on MAC-address. 3598 * If you have no ethernet card on the node, too bad. 3599 * XXX should we use fail_counter? 3600 */ 3601 #endif 3602 break; 3603 #ifdef notyet 3604 case IPV6CP_OPT_COMPRESS: 3605 /* 3606 * Peer wants different compression parameters. 3607 */ 3608 break; 3609 #endif 3610 } 3611 } 3612 if (debug) 3613 addlog("\n"); 3614 drop: 3615 free(buf, M_TEMP); 3616 return; 3617 } 3618 3619 static void 3620 sppp_ipv6cp_tlu(struct sppp *sp) 3621 { 3622 /* we are up - notify isdn daemon */ 3623 if (sp->pp_con) 3624 sp->pp_con(sp); 3625 } 3626 3627 static void 3628 sppp_ipv6cp_tld(struct sppp *sp) 3629 { 3630 } 3631 3632 static void 3633 sppp_ipv6cp_tls(struct sppp *sp) 3634 { 3635 /* indicate to LCP that it must stay alive */ 3636 sp->lcp.protos |= (1 << IDX_IPV6CP); 3637 } 3638 3639 static void 3640 sppp_ipv6cp_tlf(struct sppp *sp) 3641 { 3642 /* we no longer need LCP */ 3643 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3644 } 3645 3646 static void 3647 sppp_ipv6cp_scr(struct sppp *sp) 3648 { 3649 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3650 struct in6_addr ouraddr; 3651 int i = 0; 3652 3653 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3654 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3655 opt[i++] = IPV6CP_OPT_IFID; 3656 opt[i++] = 10; 3657 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3658 i += 8; 3659 } 3660 3661 #ifdef notyet 3662 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3663 opt[i++] = IPV6CP_OPT_COMPRESSION; 3664 opt[i++] = 4; 3665 opt[i++] = 0; /* TBD */ 3666 opt[i++] = 0; /* TBD */ 3667 /* variable length data may follow */ 3668 } 3669 #endif 3670 3671 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3672 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3673 } 3674 #else /*INET6*/ 3675 static void 3676 sppp_ipv6cp_init(struct sppp *sp) 3677 { 3678 } 3679 3680 static void 3681 sppp_ipv6cp_up(struct sppp *sp) 3682 { 3683 } 3684 3685 static void 3686 sppp_ipv6cp_down(struct sppp *sp) 3687 { 3688 } 3689 3690 static void 3691 sppp_ipv6cp_open(struct sppp *sp) 3692 { 3693 } 3694 3695 static void 3696 sppp_ipv6cp_close(struct sppp *sp) 3697 { 3698 } 3699 3700 static void 3701 sppp_ipv6cp_TO(void *sp) 3702 { 3703 } 3704 3705 static int 3706 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3707 int len) 3708 { 3709 return 0; 3710 } 3711 3712 static void 3713 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3714 int len) 3715 { 3716 } 3717 3718 static void 3719 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3720 int len) 3721 { 3722 } 3723 3724 static void 3725 sppp_ipv6cp_tlu(struct sppp *sp) 3726 { 3727 } 3728 3729 static void 3730 sppp_ipv6cp_tld(struct sppp *sp) 3731 { 3732 } 3733 3734 static void 3735 sppp_ipv6cp_tls(struct sppp *sp) 3736 { 3737 } 3738 3739 static void 3740 sppp_ipv6cp_tlf(struct sppp *sp) 3741 { 3742 } 3743 3744 static void 3745 sppp_ipv6cp_scr(struct sppp *sp) 3746 { 3747 } 3748 #endif /*INET6*/ 3749 3750 3751 /* 3752 *--------------------------------------------------------------------------* 3753 * * 3754 * The CHAP implementation. * 3755 * * 3756 *--------------------------------------------------------------------------* 3757 */ 3758 3759 /* 3760 * The authentication protocols don't employ a full-fledged state machine as 3761 * the control protocols do, since they do have Open and Close events, but 3762 * not Up and Down, nor are they explicitly terminated. Also, use of the 3763 * authentication protocols may be different in both directions (this makes 3764 * sense, think of a machine that never accepts incoming calls but only 3765 * calls out, it doesn't require the called party to authenticate itself). 3766 * 3767 * Our state machine for the local authentication protocol (we are requesting 3768 * the peer to authenticate) looks like: 3769 * 3770 * RCA- 3771 * +--------------------------------------------+ 3772 * V scn,tld| 3773 * +--------+ Close +---------+ RCA+ 3774 * | |<----------------------------------| |------+ 3775 * +--->| Closed | TO* | Opened | sca | 3776 * | | |-----+ +-------| |<-----+ 3777 * | +--------+ irc | | +---------+ 3778 * | ^ | | ^ 3779 * | | | | | 3780 * | | | | | 3781 * | TO-| | | | 3782 * | |tld TO+ V | | 3783 * | | +------->+ | | 3784 * | | | | | | 3785 * | +--------+ V | | 3786 * | | |<----+<--------------------+ | 3787 * | | Req- | scr | 3788 * | | Sent | | 3789 * | | | | 3790 * | +--------+ | 3791 * | RCA- | | RCA+ | 3792 * +------+ +------------------------------------------+ 3793 * scn,tld sca,irc,ict,tlu 3794 * 3795 * 3796 * with: 3797 * 3798 * Open: LCP reached authentication phase 3799 * Close: LCP reached terminate phase 3800 * 3801 * RCA+: received reply (pap-req, chap-response), acceptable 3802 * RCN: received reply (pap-req, chap-response), not acceptable 3803 * TO+: timeout with restart counter >= 0 3804 * TO-: timeout with restart counter < 0 3805 * TO*: reschedule timeout for CHAP 3806 * 3807 * scr: send request packet (none for PAP, chap-challenge) 3808 * sca: send ack packet (pap-ack, chap-success) 3809 * scn: send nak packet (pap-nak, chap-failure) 3810 * ict: initialize re-challenge timer (CHAP only) 3811 * 3812 * tlu: this-layer-up, LCP reaches network phase 3813 * tld: this-layer-down, LCP enters terminate phase 3814 * 3815 * Note that in CHAP mode, after sending a new challenge, while the state 3816 * automaton falls back into Req-Sent state, it doesn't signal a tld 3817 * event to LCP, so LCP remains in network phase. Only after not getting 3818 * any response (or after getting an unacceptable response), CHAP closes, 3819 * causing LCP to enter terminate phase. 3820 * 3821 * With PAP, there is no initial request that can be sent. The peer is 3822 * expected to send one based on the successful negotiation of PAP as 3823 * the authentication protocol during the LCP option negotiation. 3824 * 3825 * Incoming authentication protocol requests (remote requests 3826 * authentication, we are peer) don't employ a state machine at all, 3827 * they are simply answered. Some peers [Ascend P50 firmware rev 3828 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3829 * still in authentication phase (thereby violating the standard that 3830 * demands that these NCP packets are to be discarded), so we keep 3831 * track of the peer demanding us to authenticate, and only proceed to 3832 * phase network once we've seen a positive acknowledge for the 3833 * authentication. 3834 */ 3835 3836 /* 3837 * Handle incoming CHAP packets. 3838 */ 3839 void 3840 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3841 { 3842 STDDCL; 3843 struct lcp_header *h; 3844 int len, x; 3845 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3846 int value_len, name_len; 3847 MD5_CTX ctx; 3848 3849 len = m->m_pkthdr.len; 3850 if (len < 4) { 3851 if (debug) 3852 log(LOG_DEBUG, 3853 "%s: chap invalid packet length: %d bytes\n", 3854 ifp->if_xname, len); 3855 return; 3856 } 3857 h = mtod(m, struct lcp_header *); 3858 if (len > ntohs(h->len)) 3859 len = ntohs(h->len); 3860 3861 switch (h->type) { 3862 /* challenge, failure and success are his authproto */ 3863 case CHAP_CHALLENGE: 3864 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3865 /* can't do anything useful */ 3866 sp->pp_auth_failures++; 3867 printf("%s: chap input without my name and my secret being set\n", 3868 ifp->if_xname); 3869 break; 3870 } 3871 value = 1 + (u_char *)(h + 1); 3872 value_len = value[-1]; 3873 name = value + value_len; 3874 name_len = len - value_len - 5; 3875 if (name_len < 0) { 3876 if (debug) { 3877 log(LOG_DEBUG, 3878 "%s: chap corrupted challenge " 3879 "<%s id=0x%x len=%d", 3880 ifp->if_xname, 3881 sppp_auth_type_name(PPP_CHAP, h->type), 3882 h->ident, ntohs(h->len)); 3883 if (len > 4) 3884 sppp_print_bytes((u_char *)(h + 1), 3885 len - 4); 3886 addlog(">\n"); 3887 } 3888 break; 3889 } 3890 3891 if (debug) { 3892 log(LOG_DEBUG, 3893 "%s: chap input <%s id=0x%x len=%d name=", 3894 ifp->if_xname, 3895 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3896 ntohs(h->len)); 3897 sppp_print_string((char *) name, name_len); 3898 addlog(" value-size=%d value=", value_len); 3899 sppp_print_bytes(value, value_len); 3900 addlog(">\n"); 3901 } 3902 3903 /* Compute reply value. */ 3904 MD5Init(&ctx); 3905 MD5Update(&ctx, &h->ident, 1); 3906 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3907 MD5Update(&ctx, value, value_len); 3908 MD5Final(digest, &ctx); 3909 dsize = sizeof digest; 3910 3911 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3912 sizeof dsize, (const char *)&dsize, 3913 sizeof digest, digest, 3914 sp->myauth.name_len, 3915 sp->myauth.name, 3916 0); 3917 break; 3918 3919 case CHAP_SUCCESS: 3920 if (debug) { 3921 log(LOG_DEBUG, "%s: chap success", 3922 ifp->if_xname); 3923 if (len > 4) { 3924 addlog(": "); 3925 sppp_print_string((char *)(h + 1), len - 4); 3926 } 3927 addlog("\n"); 3928 } 3929 x = splnet(); 3930 sp->pp_auth_failures = 0; 3931 sp->pp_flags &= ~PP_NEEDAUTH; 3932 if (sp->myauth.proto == PPP_CHAP && 3933 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3934 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3935 /* 3936 * We are authenticator for CHAP but didn't 3937 * complete yet. Leave it to tlu to proceed 3938 * to network phase. 3939 */ 3940 splx(x); 3941 break; 3942 } 3943 splx(x); 3944 sppp_phase_network(sp); 3945 break; 3946 3947 case CHAP_FAILURE: 3948 x = splnet(); 3949 sp->pp_auth_failures++; 3950 splx(x); 3951 if (debug) { 3952 log(LOG_INFO, "%s: chap failure", 3953 ifp->if_xname); 3954 if (len > 4) { 3955 addlog(": "); 3956 sppp_print_string((char *)(h + 1), len - 4); 3957 } 3958 addlog("\n"); 3959 } else 3960 log(LOG_INFO, "%s: chap failure\n", 3961 ifp->if_xname); 3962 /* await LCP shutdown by authenticator */ 3963 break; 3964 3965 /* response is my authproto */ 3966 case CHAP_RESPONSE: 3967 if (sp->hisauth.secret == NULL) { 3968 /* can't do anything useful */ 3969 printf("%s: chap input without his secret being set\n", 3970 ifp->if_xname); 3971 break; 3972 } 3973 value = 1 + (u_char *)(h + 1); 3974 value_len = value[-1]; 3975 name = value + value_len; 3976 name_len = len - value_len - 5; 3977 if (name_len < 0) { 3978 if (debug) { 3979 log(LOG_DEBUG, 3980 "%s: chap corrupted response " 3981 "<%s id=0x%x len=%d", 3982 ifp->if_xname, 3983 sppp_auth_type_name(PPP_CHAP, h->type), 3984 h->ident, ntohs(h->len)); 3985 if (len > 4) 3986 sppp_print_bytes((u_char *)(h + 1), 3987 len - 4); 3988 addlog(">\n"); 3989 } 3990 break; 3991 } 3992 if (h->ident != sp->confid[IDX_CHAP]) { 3993 if (debug) 3994 log(LOG_DEBUG, 3995 "%s: chap dropping response for old ID " 3996 "(got %d, expected %d)\n", 3997 ifp->if_xname, 3998 h->ident, sp->confid[IDX_CHAP]); 3999 break; 4000 } 4001 if (sp->hisauth.name != NULL && 4002 (name_len != sp->hisauth.name_len 4003 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4004 log(LOG_INFO, "%s: chap response, his name ", 4005 ifp->if_xname); 4006 sppp_print_string(name, name_len); 4007 addlog(" != expected "); 4008 sppp_print_string(sp->hisauth.name, 4009 sp->hisauth.name_len); 4010 addlog("\n"); 4011 goto chap_failure; 4012 } 4013 if (debug) { 4014 log(LOG_DEBUG, "%s: chap input(%s) " 4015 "<%s id=0x%x len=%d name=", 4016 ifp->if_xname, 4017 sppp_state_name(sp->state[IDX_CHAP]), 4018 sppp_auth_type_name(PPP_CHAP, h->type), 4019 h->ident, ntohs(h->len)); 4020 sppp_print_string((char *)name, name_len); 4021 addlog(" value-size=%d value=", value_len); 4022 sppp_print_bytes(value, value_len); 4023 addlog(">\n"); 4024 } 4025 if (value_len != sizeof(sp->myauth.challenge)) { 4026 if (debug) 4027 log(LOG_DEBUG, 4028 "%s: chap bad hash value length: " 4029 "%d bytes, should be %ld\n", 4030 ifp->if_xname, value_len, 4031 (long) sizeof(sp->myauth.challenge)); 4032 goto chap_failure; 4033 } 4034 4035 MD5Init(&ctx); 4036 MD5Update(&ctx, &h->ident, 1); 4037 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4038 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4039 MD5Final(digest, &ctx); 4040 4041 #define FAILMSG "Failed..." 4042 #define SUCCMSG "Welcome!" 4043 4044 if (value_len != sizeof digest || 4045 memcmp(digest, value, value_len) != 0) { 4046 chap_failure: 4047 /* action scn, tld */ 4048 x = splnet(); 4049 sp->pp_auth_failures++; 4050 splx(x); 4051 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4052 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4053 0); 4054 chap.tld(sp); 4055 break; 4056 } 4057 sp->pp_auth_failures = 0; 4058 /* action sca, perhaps tlu */ 4059 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4060 sp->state[IDX_CHAP] == STATE_OPENED) 4061 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4062 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4063 0); 4064 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4065 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4066 chap.tlu(sp); 4067 } 4068 break; 4069 4070 default: 4071 /* Unknown CHAP packet type -- ignore. */ 4072 if (debug) { 4073 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4074 "<0x%x id=0x%xh len=%d", 4075 ifp->if_xname, 4076 sppp_state_name(sp->state[IDX_CHAP]), 4077 h->type, h->ident, ntohs(h->len)); 4078 if (len > 4) 4079 sppp_print_bytes((u_char *)(h + 1), len - 4); 4080 addlog(">\n"); 4081 } 4082 break; 4083 4084 } 4085 } 4086 4087 static void 4088 sppp_chap_init(struct sppp *sp) 4089 { 4090 /* Chap doesn't have STATE_INITIAL at all. */ 4091 sp->state[IDX_CHAP] = STATE_CLOSED; 4092 sp->fail_counter[IDX_CHAP] = 0; 4093 sp->pp_seq[IDX_CHAP] = 0; 4094 sp->pp_rseq[IDX_CHAP] = 0; 4095 callout_init(&sp->ch[IDX_CHAP], 0); 4096 } 4097 4098 static void 4099 sppp_chap_open(struct sppp *sp) 4100 { 4101 if (sp->myauth.proto == PPP_CHAP && 4102 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4103 /* we are authenticator for CHAP, start it */ 4104 chap.scr(sp); 4105 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4106 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4107 } 4108 /* nothing to be done if we are peer, await a challenge */ 4109 } 4110 4111 static void 4112 sppp_chap_close(struct sppp *sp) 4113 { 4114 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4115 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4116 } 4117 4118 static void 4119 sppp_chap_TO(void *cookie) 4120 { 4121 struct sppp *sp = (struct sppp *)cookie; 4122 STDDCL; 4123 int s; 4124 4125 s = splnet(); 4126 if (debug) 4127 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4128 ifp->if_xname, 4129 sppp_state_name(sp->state[IDX_CHAP]), 4130 sp->rst_counter[IDX_CHAP]); 4131 4132 if (--sp->rst_counter[IDX_CHAP] < 0) 4133 /* TO- event */ 4134 switch (sp->state[IDX_CHAP]) { 4135 case STATE_REQ_SENT: 4136 chap.tld(sp); 4137 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4138 break; 4139 } 4140 else 4141 /* TO+ (or TO*) event */ 4142 switch (sp->state[IDX_CHAP]) { 4143 case STATE_OPENED: 4144 /* TO* event */ 4145 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4146 /* fall through */ 4147 case STATE_REQ_SENT: 4148 chap.scr(sp); 4149 /* sppp_cp_change_state() will restart the timer */ 4150 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4151 break; 4152 } 4153 4154 splx(s); 4155 } 4156 4157 static void 4158 sppp_chap_tlu(struct sppp *sp) 4159 { 4160 STDDCL; 4161 int i, x; 4162 4163 i = 0; 4164 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4165 4166 /* 4167 * Some broken CHAP implementations (Conware CoNet, firmware 4168 * 4.0.?) don't want to re-authenticate their CHAP once the 4169 * initial challenge-response exchange has taken place. 4170 * Provide for an option to avoid rechallenges. 4171 */ 4172 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4173 /* 4174 * Compute the re-challenge timeout. This will yield 4175 * a number between 300 and 810 seconds. 4176 */ 4177 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4178 4179 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4180 } 4181 4182 if (debug) { 4183 log(LOG_DEBUG, 4184 "%s: chap %s, ", 4185 ifp->if_xname, 4186 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4187 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4188 addlog("next re-challenge in %d seconds\n", i); 4189 else 4190 addlog("re-challenging supressed\n"); 4191 } 4192 4193 x = splnet(); 4194 sp->pp_auth_failures = 0; 4195 /* indicate to LCP that we need to be closed down */ 4196 sp->lcp.protos |= (1 << IDX_CHAP); 4197 4198 if (sp->pp_flags & PP_NEEDAUTH) { 4199 /* 4200 * Remote is authenticator, but his auth proto didn't 4201 * complete yet. Defer the transition to network 4202 * phase. 4203 */ 4204 splx(x); 4205 return; 4206 } 4207 splx(x); 4208 4209 /* 4210 * If we are already in phase network, we are done here. This 4211 * is the case if this is a dummy tlu event after a re-challenge. 4212 */ 4213 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4214 sppp_phase_network(sp); 4215 } 4216 4217 static void 4218 sppp_chap_tld(struct sppp *sp) 4219 { 4220 STDDCL; 4221 4222 if (debug) 4223 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4224 callout_stop(&sp->ch[IDX_CHAP]); 4225 sp->lcp.protos &= ~(1 << IDX_CHAP); 4226 4227 lcp.Close(sp); 4228 } 4229 4230 static void 4231 sppp_chap_scr(struct sppp *sp) 4232 { 4233 uint32_t *ch; 4234 u_char clen = 4 * sizeof(uint32_t); 4235 4236 if (sp->myauth.name == NULL) { 4237 /* can't do anything useful */ 4238 printf("%s: chap starting without my name being set\n", 4239 sp->pp_if.if_xname); 4240 return; 4241 } 4242 4243 /* Compute random challenge. */ 4244 ch = (uint32_t *)sp->myauth.challenge; 4245 cprng_strong(kern_cprng, ch, clen, 0); 4246 4247 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4248 4249 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4250 sizeof clen, (const char *)&clen, 4251 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4252 sp->myauth.name_len, 4253 sp->myauth.name, 4254 0); 4255 } 4256 4257 /* 4258 *--------------------------------------------------------------------------* 4259 * * 4260 * The PAP implementation. * 4261 * * 4262 *--------------------------------------------------------------------------* 4263 */ 4264 /* 4265 * For PAP, we need to keep a little state also if we are the peer, not the 4266 * authenticator. This is since we don't get a request to authenticate, but 4267 * have to repeatedly authenticate ourself until we got a response (or the 4268 * retry counter is expired). 4269 */ 4270 4271 /* 4272 * Handle incoming PAP packets. */ 4273 static void 4274 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4275 { 4276 STDDCL; 4277 struct lcp_header *h; 4278 int len, x; 4279 u_char mlen; 4280 char *name, *secret; 4281 int name_len, secret_len; 4282 4283 /* 4284 * Malicious input might leave this uninitialized, so 4285 * init to an impossible value. 4286 */ 4287 secret_len = -1; 4288 4289 len = m->m_pkthdr.len; 4290 if (len < 5) { 4291 if (debug) 4292 log(LOG_DEBUG, 4293 "%s: pap invalid packet length: %d bytes\n", 4294 ifp->if_xname, len); 4295 return; 4296 } 4297 h = mtod(m, struct lcp_header *); 4298 if (len > ntohs(h->len)) 4299 len = ntohs(h->len); 4300 switch (h->type) { 4301 /* PAP request is my authproto */ 4302 case PAP_REQ: 4303 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4304 /* can't do anything useful */ 4305 printf("%s: pap request without his name and his secret being set\n", 4306 ifp->if_xname); 4307 break; 4308 } 4309 name = 1 + (u_char *)(h + 1); 4310 name_len = name[-1]; 4311 secret = name + name_len + 1; 4312 if (name_len > len - 6 || 4313 (secret_len = secret[-1]) > len - 6 - name_len) { 4314 if (debug) { 4315 log(LOG_DEBUG, "%s: pap corrupted input " 4316 "<%s id=0x%x len=%d", 4317 ifp->if_xname, 4318 sppp_auth_type_name(PPP_PAP, h->type), 4319 h->ident, ntohs(h->len)); 4320 if (len > 4) 4321 sppp_print_bytes((u_char *)(h + 1), 4322 len - 4); 4323 addlog(">\n"); 4324 } 4325 break; 4326 } 4327 if (debug) { 4328 log(LOG_DEBUG, "%s: pap input(%s) " 4329 "<%s id=0x%x len=%d name=", 4330 ifp->if_xname, 4331 sppp_state_name(sp->state[IDX_PAP]), 4332 sppp_auth_type_name(PPP_PAP, h->type), 4333 h->ident, ntohs(h->len)); 4334 sppp_print_string((char *)name, name_len); 4335 addlog(" secret="); 4336 sppp_print_string((char *)secret, secret_len); 4337 addlog(">\n"); 4338 } 4339 if (name_len != sp->hisauth.name_len || 4340 secret_len != sp->hisauth.secret_len || 4341 memcmp(name, sp->hisauth.name, name_len) != 0 || 4342 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4343 /* action scn, tld */ 4344 sp->pp_auth_failures++; 4345 mlen = sizeof(FAILMSG) - 1; 4346 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4347 sizeof mlen, (const char *)&mlen, 4348 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4349 0); 4350 pap.tld(sp); 4351 break; 4352 } 4353 /* action sca, perhaps tlu */ 4354 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4355 sp->state[IDX_PAP] == STATE_OPENED) { 4356 mlen = sizeof(SUCCMSG) - 1; 4357 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4358 sizeof mlen, (const char *)&mlen, 4359 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4360 0); 4361 } 4362 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4363 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4364 pap.tlu(sp); 4365 } 4366 break; 4367 4368 /* ack and nak are his authproto */ 4369 case PAP_ACK: 4370 callout_stop(&sp->pap_my_to_ch); 4371 if (debug) { 4372 log(LOG_DEBUG, "%s: pap success", 4373 ifp->if_xname); 4374 name = 1 + (u_char *)(h + 1); 4375 name_len = name[-1]; 4376 if (len > 5 && name_len < len+4) { 4377 addlog(": "); 4378 sppp_print_string(name, name_len); 4379 } 4380 addlog("\n"); 4381 } 4382 x = splnet(); 4383 sp->pp_auth_failures = 0; 4384 sp->pp_flags &= ~PP_NEEDAUTH; 4385 if (sp->myauth.proto == PPP_PAP && 4386 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4387 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4388 /* 4389 * We are authenticator for PAP but didn't 4390 * complete yet. Leave it to tlu to proceed 4391 * to network phase. 4392 */ 4393 splx(x); 4394 break; 4395 } 4396 splx(x); 4397 sppp_phase_network(sp); 4398 break; 4399 4400 case PAP_NAK: 4401 callout_stop(&sp->pap_my_to_ch); 4402 sp->pp_auth_failures++; 4403 if (debug) { 4404 log(LOG_INFO, "%s: pap failure", 4405 ifp->if_xname); 4406 name = 1 + (u_char *)(h + 1); 4407 name_len = name[-1]; 4408 if (len > 5 && name_len < len+4) { 4409 addlog(": "); 4410 sppp_print_string(name, name_len); 4411 } 4412 addlog("\n"); 4413 } else 4414 log(LOG_INFO, "%s: pap failure\n", 4415 ifp->if_xname); 4416 /* await LCP shutdown by authenticator */ 4417 break; 4418 4419 default: 4420 /* Unknown PAP packet type -- ignore. */ 4421 if (debug) { 4422 log(LOG_DEBUG, "%s: pap corrupted input " 4423 "<0x%x id=0x%x len=%d", 4424 ifp->if_xname, 4425 h->type, h->ident, ntohs(h->len)); 4426 if (len > 4) 4427 sppp_print_bytes((u_char *)(h + 1), len - 4); 4428 addlog(">\n"); 4429 } 4430 break; 4431 4432 } 4433 } 4434 4435 static void 4436 sppp_pap_init(struct sppp *sp) 4437 { 4438 /* PAP doesn't have STATE_INITIAL at all. */ 4439 sp->state[IDX_PAP] = STATE_CLOSED; 4440 sp->fail_counter[IDX_PAP] = 0; 4441 sp->pp_seq[IDX_PAP] = 0; 4442 sp->pp_rseq[IDX_PAP] = 0; 4443 callout_init(&sp->ch[IDX_PAP], 0); 4444 callout_init(&sp->pap_my_to_ch, 0); 4445 } 4446 4447 static void 4448 sppp_pap_open(struct sppp *sp) 4449 { 4450 if (sp->hisauth.proto == PPP_PAP && 4451 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4452 /* we are authenticator for PAP, start our timer */ 4453 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4454 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4455 } 4456 if (sp->myauth.proto == PPP_PAP) { 4457 /* we are peer, send a request, and start a timer */ 4458 pap.scr(sp); 4459 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4460 sppp_pap_my_TO, sp); 4461 } 4462 } 4463 4464 static void 4465 sppp_pap_close(struct sppp *sp) 4466 { 4467 if (sp->state[IDX_PAP] != STATE_CLOSED) 4468 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4469 } 4470 4471 /* 4472 * That's the timeout routine if we are authenticator. Since the 4473 * authenticator is basically passive in PAP, we can't do much here. 4474 */ 4475 static void 4476 sppp_pap_TO(void *cookie) 4477 { 4478 struct sppp *sp = (struct sppp *)cookie; 4479 STDDCL; 4480 int s; 4481 4482 s = splnet(); 4483 if (debug) 4484 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4485 ifp->if_xname, 4486 sppp_state_name(sp->state[IDX_PAP]), 4487 sp->rst_counter[IDX_PAP]); 4488 4489 if (--sp->rst_counter[IDX_PAP] < 0) 4490 /* TO- event */ 4491 switch (sp->state[IDX_PAP]) { 4492 case STATE_REQ_SENT: 4493 pap.tld(sp); 4494 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4495 break; 4496 } 4497 else 4498 /* TO+ event, not very much we could do */ 4499 switch (sp->state[IDX_PAP]) { 4500 case STATE_REQ_SENT: 4501 /* sppp_cp_change_state() will restart the timer */ 4502 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4503 break; 4504 } 4505 4506 splx(s); 4507 } 4508 4509 /* 4510 * That's the timeout handler if we are peer. Since the peer is active, 4511 * we need to retransmit our PAP request since it is apparently lost. 4512 * XXX We should impose a max counter. 4513 */ 4514 static void 4515 sppp_pap_my_TO(void *cookie) 4516 { 4517 struct sppp *sp = (struct sppp *)cookie; 4518 STDDCL; 4519 4520 if (debug) 4521 log(LOG_DEBUG, "%s: pap peer TO\n", 4522 ifp->if_xname); 4523 4524 pap.scr(sp); 4525 } 4526 4527 static void 4528 sppp_pap_tlu(struct sppp *sp) 4529 { 4530 STDDCL; 4531 int x; 4532 4533 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4534 4535 if (debug) 4536 log(LOG_DEBUG, "%s: %s tlu\n", 4537 ifp->if_xname, pap.name); 4538 4539 x = splnet(); 4540 sp->pp_auth_failures = 0; 4541 /* indicate to LCP that we need to be closed down */ 4542 sp->lcp.protos |= (1 << IDX_PAP); 4543 4544 if (sp->pp_flags & PP_NEEDAUTH) { 4545 /* 4546 * Remote is authenticator, but his auth proto didn't 4547 * complete yet. Defer the transition to network 4548 * phase. 4549 */ 4550 splx(x); 4551 return; 4552 } 4553 splx(x); 4554 sppp_phase_network(sp); 4555 } 4556 4557 static void 4558 sppp_pap_tld(struct sppp *sp) 4559 { 4560 STDDCL; 4561 4562 if (debug) 4563 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4564 callout_stop(&sp->ch[IDX_PAP]); 4565 callout_stop(&sp->pap_my_to_ch); 4566 sp->lcp.protos &= ~(1 << IDX_PAP); 4567 4568 lcp.Close(sp); 4569 } 4570 4571 static void 4572 sppp_pap_scr(struct sppp *sp) 4573 { 4574 u_char idlen, pwdlen; 4575 4576 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4577 /* can't do anything useful */ 4578 printf("%s: pap starting without my name and secret being set\n", 4579 sp->pp_if.if_xname); 4580 return; 4581 } 4582 4583 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4584 pwdlen = sp->myauth.secret_len; 4585 idlen = sp->myauth.name_len; 4586 4587 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4588 sizeof idlen, (const char *)&idlen, 4589 idlen, sp->myauth.name, 4590 sizeof pwdlen, (const char *)&pwdlen, 4591 pwdlen, sp->myauth.secret, 4592 0); 4593 } 4594 4595 /* 4596 * Random miscellaneous functions. 4597 */ 4598 4599 /* 4600 * Send a PAP or CHAP proto packet. 4601 * 4602 * Varadic function, each of the elements for the ellipsis is of type 4603 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4604 * mlen == 0. 4605 * NOTE: never declare variadic functions with types subject to type 4606 * promotion (i.e. u_char). This is asking for big trouble depending 4607 * on the architecture you are on... 4608 */ 4609 4610 static void 4611 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4612 unsigned int type, unsigned int id, 4613 ...) 4614 { 4615 STDDCL; 4616 struct lcp_header *lh; 4617 struct mbuf *m; 4618 u_char *p; 4619 int len; 4620 size_t pkthdrlen; 4621 unsigned int mlen; 4622 const char *msg; 4623 va_list ap; 4624 4625 MGETHDR(m, M_DONTWAIT, MT_DATA); 4626 if (! m) 4627 return; 4628 m->m_pkthdr.rcvif = 0; 4629 4630 if (sp->pp_flags & PP_NOFRAMING) { 4631 *mtod(m, uint16_t *) = htons(cp->proto); 4632 pkthdrlen = 2; 4633 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4634 } else { 4635 struct ppp_header *h; 4636 h = mtod(m, struct ppp_header *); 4637 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4638 h->control = PPP_UI; /* Unnumbered Info */ 4639 h->protocol = htons(cp->proto); 4640 pkthdrlen = PPP_HEADER_LEN; 4641 4642 lh = (struct lcp_header *)(h + 1); 4643 } 4644 4645 lh->type = type; 4646 lh->ident = id; 4647 p = (u_char *)(lh + 1); 4648 4649 va_start(ap, id); 4650 len = 0; 4651 4652 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4653 msg = va_arg(ap, const char *); 4654 len += mlen; 4655 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4656 va_end(ap); 4657 m_freem(m); 4658 return; 4659 } 4660 4661 memcpy(p, msg, mlen); 4662 p += mlen; 4663 } 4664 va_end(ap); 4665 4666 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4667 lh->len = htons(LCP_HEADER_LEN + len); 4668 4669 if (debug) { 4670 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4671 ifp->if_xname, cp->name, 4672 sppp_auth_type_name(cp->proto, lh->type), 4673 lh->ident, ntohs(lh->len)); 4674 if (len) 4675 sppp_print_bytes((u_char *)(lh + 1), len); 4676 addlog(">\n"); 4677 } 4678 if (IF_QFULL(&sp->pp_cpq)) { 4679 IF_DROP(&sp->pp_fastq); 4680 IF_DROP(&ifp->if_snd); 4681 m_freem(m); 4682 ++ifp->if_oerrors; 4683 return; 4684 } else 4685 IF_ENQUEUE(&sp->pp_cpq, m); 4686 if (! (ifp->if_flags & IFF_OACTIVE)) 4687 (*ifp->if_start)(ifp); 4688 ifp->if_obytes += m->m_pkthdr.len + 3; 4689 } 4690 4691 /* 4692 * Send keepalive packets, every 10 seconds. 4693 */ 4694 static void 4695 sppp_keepalive(void *dummy) 4696 { 4697 struct sppp *sp; 4698 int s; 4699 time_t now; 4700 4701 s = splnet(); 4702 now = time_uptime; 4703 for (sp=spppq; sp; sp=sp->pp_next) { 4704 struct ifnet *ifp = &sp->pp_if; 4705 4706 /* check idle timeout */ 4707 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4708 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4709 /* idle timeout is enabled for this interface */ 4710 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4711 if (ifp->if_flags & IFF_DEBUG) 4712 printf("%s: no activity for %lu seconds\n", 4713 sp->pp_if.if_xname, 4714 (unsigned long)(now-sp->pp_last_activity)); 4715 lcp.Close(sp); 4716 continue; 4717 } 4718 } 4719 4720 /* Keepalive mode disabled or channel down? */ 4721 if (! (sp->pp_flags & PP_KEEPALIVE) || 4722 ! (ifp->if_flags & IFF_RUNNING)) 4723 continue; 4724 4725 /* No keepalive in PPP mode if LCP not opened yet. */ 4726 if (! (sp->pp_flags & PP_CISCO) && 4727 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4728 continue; 4729 4730 /* No echo reply, but maybe user data passed through? */ 4731 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4732 sp->pp_alivecnt = 0; 4733 continue; 4734 } 4735 4736 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4737 /* No keepalive packets got. Stop the interface. */ 4738 if_down (ifp); 4739 IF_PURGE(&sp->pp_cpq); 4740 if (! (sp->pp_flags & PP_CISCO)) { 4741 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4742 ifp->if_xname); 4743 sp->pp_alivecnt = 0; 4744 4745 /* we are down, close all open protocols */ 4746 lcp.Close(sp); 4747 4748 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4749 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4750 4751 /* Close connection immediately, completition of this 4752 * will summon the magic needed to reestablish it. */ 4753 if (sp->pp_tlf) 4754 sp->pp_tlf(sp); 4755 continue; 4756 } 4757 } 4758 if (sp->pp_alivecnt < sp->pp_maxalive) 4759 ++sp->pp_alivecnt; 4760 if (sp->pp_flags & PP_CISCO) 4761 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4762 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4763 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4764 int32_t nmagic = htonl(sp->lcp.magic); 4765 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4766 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4767 sp->lcp.echoid, 4, &nmagic); 4768 } 4769 } 4770 splx(s); 4771 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4772 } 4773 4774 #ifdef INET 4775 /* 4776 * Get both IP addresses. 4777 */ 4778 static void 4779 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4780 { 4781 struct ifnet *ifp = &sp->pp_if; 4782 struct ifaddr *ifa; 4783 struct sockaddr_in *si, *sm; 4784 uint32_t ssrc, ddst; 4785 4786 sm = NULL; 4787 ssrc = ddst = 0; 4788 /* 4789 * Pick the first AF_INET address from the list, 4790 * aliases don't make any sense on a p2p link anyway. 4791 */ 4792 si = 0; 4793 IFADDR_FOREACH(ifa, ifp) { 4794 if (ifa->ifa_addr->sa_family == AF_INET) { 4795 si = (struct sockaddr_in *)ifa->ifa_addr; 4796 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4797 if (si) 4798 break; 4799 } 4800 } 4801 if (ifa) { 4802 if (si && si->sin_addr.s_addr) { 4803 ssrc = si->sin_addr.s_addr; 4804 if (srcmask) 4805 *srcmask = ntohl(sm->sin_addr.s_addr); 4806 } 4807 4808 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4809 if (si && si->sin_addr.s_addr) 4810 ddst = si->sin_addr.s_addr; 4811 } 4812 4813 if (dst) *dst = ntohl(ddst); 4814 if (src) *src = ntohl(ssrc); 4815 } 4816 4817 /* 4818 * Set IP addresses. Must be called at splnet. 4819 * If an address is 0, leave it the way it is. 4820 */ 4821 static void 4822 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4823 { 4824 STDDCL; 4825 struct ifaddr *ifa; 4826 struct sockaddr_in *si, *dest; 4827 4828 /* 4829 * Pick the first AF_INET address from the list, 4830 * aliases don't make any sense on a p2p link anyway. 4831 */ 4832 4833 IFADDR_FOREACH(ifa, ifp) { 4834 if (ifa->ifa_addr->sa_family == AF_INET) { 4835 si = (struct sockaddr_in *)ifa->ifa_addr; 4836 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4837 goto found; 4838 } 4839 } 4840 return; 4841 4842 found: 4843 { 4844 int error, hostIsNew; 4845 struct sockaddr_in new_sin = *si; 4846 struct sockaddr_in new_dst = *dest; 4847 4848 /* 4849 * Scrub old routes now instead of calling in_ifinit with 4850 * scrub=1, because we may change the dstaddr 4851 * before the call to in_ifinit. 4852 */ 4853 in_ifscrub(ifp, ifatoia(ifa)); 4854 4855 hostIsNew = 0; 4856 if (myaddr != 0) { 4857 if (new_sin.sin_addr.s_addr != htonl(myaddr)) { 4858 new_sin.sin_addr.s_addr = htonl(myaddr); 4859 hostIsNew = 1; 4860 } 4861 } 4862 if (hisaddr != 0) { 4863 new_dst.sin_addr.s_addr = htonl(hisaddr); 4864 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4865 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4866 *dest = new_dst; /* fix dstaddr in place */ 4867 } 4868 } 4869 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0, hostIsNew); 4870 if (debug && error) 4871 { 4872 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4873 " failed, error=%d\n", ifp->if_xname, error); 4874 } 4875 if (!error) { 4876 (void)pfil_run_hooks(if_pfil, 4877 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4878 } 4879 } 4880 } 4881 4882 /* 4883 * Clear IP addresses. Must be called at splnet. 4884 */ 4885 static void 4886 sppp_clear_ip_addrs(struct sppp *sp) 4887 { 4888 struct ifnet *ifp = &sp->pp_if; 4889 struct ifaddr *ifa; 4890 struct sockaddr_in *si, *dest; 4891 4892 uint32_t remote; 4893 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4894 remote = sp->ipcp.saved_hisaddr; 4895 else 4896 sppp_get_ip_addrs(sp, 0, &remote, 0); 4897 4898 /* 4899 * Pick the first AF_INET address from the list, 4900 * aliases don't make any sense on a p2p link anyway. 4901 */ 4902 4903 IFADDR_FOREACH(ifa, ifp) { 4904 if (ifa->ifa_addr->sa_family == AF_INET) { 4905 si = (struct sockaddr_in *)ifa->ifa_addr; 4906 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4907 goto found; 4908 } 4909 } 4910 return; 4911 4912 found: 4913 { 4914 struct sockaddr_in new_sin = *si; 4915 4916 in_ifscrub(ifp, ifatoia(ifa)); 4917 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4918 new_sin.sin_addr.s_addr = 0; 4919 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4920 /* replace peer addr in place */ 4921 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4922 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0, 0); 4923 (void)pfil_run_hooks(if_pfil, 4924 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4925 } 4926 } 4927 #endif 4928 4929 #ifdef INET6 4930 /* 4931 * Get both IPv6 addresses. 4932 */ 4933 static void 4934 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4935 struct in6_addr *srcmask) 4936 { 4937 struct ifnet *ifp = &sp->pp_if; 4938 struct ifaddr *ifa; 4939 struct sockaddr_in6 *si, *sm; 4940 struct in6_addr ssrc, ddst; 4941 4942 sm = NULL; 4943 memset(&ssrc, 0, sizeof(ssrc)); 4944 memset(&ddst, 0, sizeof(ddst)); 4945 /* 4946 * Pick the first link-local AF_INET6 address from the list, 4947 * aliases don't make any sense on a p2p link anyway. 4948 */ 4949 si = 0; 4950 IFADDR_FOREACH(ifa, ifp) 4951 if (ifa->ifa_addr->sa_family == AF_INET6) { 4952 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4953 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4954 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4955 break; 4956 } 4957 if (ifa) { 4958 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4959 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4960 if (srcmask) { 4961 memcpy(srcmask, &sm->sin6_addr, 4962 sizeof(*srcmask)); 4963 } 4964 } 4965 4966 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4967 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4968 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4969 } 4970 4971 if (dst) 4972 memcpy(dst, &ddst, sizeof(*dst)); 4973 if (src) 4974 memcpy(src, &ssrc, sizeof(*src)); 4975 } 4976 4977 #ifdef IPV6CP_MYIFID_DYN 4978 /* 4979 * Generate random ifid. 4980 */ 4981 static void 4982 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4983 { 4984 /* TBD */ 4985 } 4986 4987 /* 4988 * Set my IPv6 address. Must be called at splnet. 4989 */ 4990 static void 4991 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4992 { 4993 STDDCL; 4994 struct ifaddr *ifa; 4995 struct sockaddr_in6 *sin6; 4996 4997 /* 4998 * Pick the first link-local AF_INET6 address from the list, 4999 * aliases don't make any sense on a p2p link anyway. 5000 */ 5001 5002 sin6 = NULL; 5003 IFADDR_FOREACH(ifa, ifp) 5004 { 5005 if (ifa->ifa_addr->sa_family == AF_INET6) 5006 { 5007 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5008 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5009 break; 5010 } 5011 } 5012 5013 if (ifa && sin6) 5014 { 5015 int error; 5016 struct sockaddr_in6 new_sin6 = *sin6; 5017 5018 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5019 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5020 if (debug && error) 5021 { 5022 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5023 " failed, error=%d\n", ifp->if_xname, error); 5024 } 5025 if (!error) { 5026 (void)pfil_run_hooks(if_pfil, 5027 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5028 } 5029 } 5030 } 5031 #endif 5032 5033 /* 5034 * Suggest a candidate address to be used by peer. 5035 */ 5036 static void 5037 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5038 { 5039 struct in6_addr myaddr; 5040 struct timeval tv; 5041 5042 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5043 5044 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5045 microtime(&tv); 5046 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5047 myaddr.s6_addr[14] ^= 0xff; 5048 myaddr.s6_addr[15] ^= 0xff; 5049 } else { 5050 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5051 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5052 } 5053 if (suggest) 5054 memcpy(suggest, &myaddr, sizeof(myaddr)); 5055 } 5056 #endif /*INET6*/ 5057 5058 /* 5059 * Process ioctl requests specific to the PPP interface. 5060 * Permissions have already been checked. 5061 */ 5062 static int 5063 sppp_params(struct sppp *sp, u_long cmd, void *data) 5064 { 5065 switch (cmd) { 5066 case SPPPGETAUTHCFG: 5067 { 5068 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5069 int error; 5070 size_t len; 5071 5072 cfg->myauthflags = sp->myauth.flags; 5073 cfg->hisauthflags = sp->hisauth.flags; 5074 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5075 cfg->hisauth = 0; 5076 if (sp->hisauth.proto) 5077 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5078 cfg->myauth = 0; 5079 if (sp->myauth.proto) 5080 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5081 if (cfg->myname_length == 0) { 5082 if (sp->myauth.name != NULL) 5083 cfg->myname_length = sp->myauth.name_len + 1; 5084 } else { 5085 if (sp->myauth.name == NULL) { 5086 cfg->myname_length = 0; 5087 } else { 5088 len = sp->myauth.name_len + 1; 5089 if (cfg->myname_length < len) 5090 return (ENAMETOOLONG); 5091 error = copyout(sp->myauth.name, cfg->myname, len); 5092 if (error) return error; 5093 } 5094 } 5095 if (cfg->hisname_length == 0) { 5096 if (sp->hisauth.name != NULL) 5097 cfg->hisname_length = sp->hisauth.name_len + 1; 5098 } else { 5099 if (sp->hisauth.name == NULL) { 5100 cfg->hisname_length = 0; 5101 } else { 5102 len = sp->hisauth.name_len + 1; 5103 if (cfg->hisname_length < len) 5104 return (ENAMETOOLONG); 5105 error = copyout(sp->hisauth.name, cfg->hisname, len); 5106 if (error) return error; 5107 } 5108 } 5109 } 5110 break; 5111 case SPPPSETAUTHCFG: 5112 { 5113 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5114 int error; 5115 5116 if (sp->myauth.name) { 5117 free(sp->myauth.name, M_DEVBUF); 5118 sp->myauth.name = NULL; 5119 } 5120 if (sp->myauth.secret) { 5121 free(sp->myauth.secret, M_DEVBUF); 5122 sp->myauth.secret = NULL; 5123 } 5124 if (sp->hisauth.name) { 5125 free(sp->hisauth.name, M_DEVBUF); 5126 sp->hisauth.name = NULL; 5127 } 5128 if (sp->hisauth.secret) { 5129 free(sp->hisauth.secret, M_DEVBUF); 5130 sp->hisauth.secret = NULL; 5131 } 5132 5133 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5134 if (cfg->hisname_length >= MCLBYTES) 5135 return (ENAMETOOLONG); 5136 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5137 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5138 if (error) { 5139 free(sp->hisauth.name, M_DEVBUF); 5140 sp->hisauth.name = NULL; 5141 return error; 5142 } 5143 sp->hisauth.name_len = cfg->hisname_length - 1; 5144 sp->hisauth.name[sp->hisauth.name_len] = 0; 5145 } 5146 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5147 if (cfg->hissecret_length >= MCLBYTES) 5148 return (ENAMETOOLONG); 5149 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5150 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5151 if (error) { 5152 free(sp->hisauth.secret, M_DEVBUF); 5153 sp->hisauth.secret = NULL; 5154 return error; 5155 } 5156 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5157 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5158 } 5159 if (cfg->myname != NULL && cfg->myname_length > 0) { 5160 if (cfg->myname_length >= MCLBYTES) 5161 return (ENAMETOOLONG); 5162 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5163 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5164 if (error) { 5165 free(sp->myauth.name, M_DEVBUF); 5166 sp->myauth.name = NULL; 5167 return error; 5168 } 5169 sp->myauth.name_len = cfg->myname_length - 1; 5170 sp->myauth.name[sp->myauth.name_len] = 0; 5171 } 5172 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5173 if (cfg->mysecret_length >= MCLBYTES) 5174 return (ENAMETOOLONG); 5175 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5176 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5177 if (error) { 5178 free(sp->myauth.secret, M_DEVBUF); 5179 sp->myauth.secret = NULL; 5180 return error; 5181 } 5182 sp->myauth.secret_len = cfg->mysecret_length - 1; 5183 sp->myauth.secret[sp->myauth.secret_len] = 0; 5184 } 5185 sp->myauth.flags = cfg->myauthflags; 5186 if (cfg->myauth) 5187 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5188 sp->hisauth.flags = cfg->hisauthflags; 5189 if (cfg->hisauth) 5190 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5191 sp->pp_auth_failures = 0; 5192 if (sp->hisauth.proto != 0) 5193 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5194 else 5195 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5196 } 5197 break; 5198 case SPPPGETLCPCFG: 5199 { 5200 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5201 lcpp->lcp_timeout = sp->lcp.timeout; 5202 } 5203 break; 5204 case SPPPSETLCPCFG: 5205 { 5206 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5207 sp->lcp.timeout = lcpp->lcp_timeout; 5208 } 5209 break; 5210 case SPPPGETSTATUS: 5211 { 5212 struct spppstatus *status = (struct spppstatus *)data; 5213 status->phase = sp->pp_phase; 5214 } 5215 break; 5216 case SPPPGETSTATUSNCP: 5217 { 5218 struct spppstatusncp *status = (struct spppstatusncp *)data; 5219 status->phase = sp->pp_phase; 5220 status->ncpup = sppp_ncp_check(sp); 5221 } 5222 break; 5223 case SPPPGETIDLETO: 5224 { 5225 struct spppidletimeout *to = (struct spppidletimeout *)data; 5226 to->idle_seconds = sp->pp_idle_timeout; 5227 } 5228 break; 5229 case SPPPSETIDLETO: 5230 { 5231 struct spppidletimeout *to = (struct spppidletimeout *)data; 5232 sp->pp_idle_timeout = to->idle_seconds; 5233 } 5234 break; 5235 case SPPPSETAUTHFAILURE: 5236 { 5237 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5238 sp->pp_max_auth_fail = afsettings->max_failures; 5239 sp->pp_auth_failures = 0; 5240 } 5241 break; 5242 case SPPPGETAUTHFAILURES: 5243 { 5244 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5245 stats->auth_failures = sp->pp_auth_failures; 5246 stats->max_failures = sp->pp_max_auth_fail; 5247 } 5248 break; 5249 case SPPPSETDNSOPTS: 5250 { 5251 struct spppdnssettings *req = (struct spppdnssettings *)data; 5252 sp->query_dns = req->query_dns & 3; 5253 } 5254 break; 5255 case SPPPGETDNSOPTS: 5256 { 5257 struct spppdnssettings *req = (struct spppdnssettings *)data; 5258 req->query_dns = sp->query_dns; 5259 } 5260 break; 5261 case SPPPGETDNSADDRS: 5262 { 5263 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5264 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5265 } 5266 break; 5267 case SPPPGETKEEPALIVE: 5268 { 5269 struct spppkeepalivesettings *settings = 5270 (struct spppkeepalivesettings*)data; 5271 settings->maxalive = sp->pp_maxalive; 5272 settings->max_noreceive = sp->pp_max_noreceive; 5273 } 5274 break; 5275 case SPPPSETKEEPALIVE: 5276 { 5277 struct spppkeepalivesettings *settings = 5278 (struct spppkeepalivesettings*)data; 5279 sp->pp_maxalive = settings->maxalive; 5280 sp->pp_max_noreceive = settings->max_noreceive; 5281 } 5282 break; 5283 #if defined(COMPAT_50) || defined(MODULAR) 5284 case __SPPPGETIDLETO50: 5285 { 5286 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5287 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5288 } 5289 break; 5290 case __SPPPSETIDLETO50: 5291 { 5292 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5293 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5294 } 5295 break; 5296 case __SPPPGETKEEPALIVE50: 5297 { 5298 struct spppkeepalivesettings50 *settings = 5299 (struct spppkeepalivesettings50*)data; 5300 settings->maxalive = sp->pp_maxalive; 5301 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5302 } 5303 break; 5304 case __SPPPSETKEEPALIVE50: 5305 { 5306 struct spppkeepalivesettings50 *settings = 5307 (struct spppkeepalivesettings50*)data; 5308 sp->pp_maxalive = settings->maxalive; 5309 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5310 } 5311 break; 5312 #endif /* COMPAT_50 || MODULAR */ 5313 default: 5314 return (EINVAL); 5315 } 5316 5317 return (0); 5318 } 5319 5320 static void 5321 sppp_phase_network(struct sppp *sp) 5322 { 5323 STDDCL; 5324 int i; 5325 uint32_t mask; 5326 5327 sp->pp_phase = SPPP_PHASE_NETWORK; 5328 5329 if (debug) 5330 { 5331 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5332 sppp_phase_name(sp->pp_phase)); 5333 } 5334 5335 /* Notify NCPs now. */ 5336 for (i = 0; i < IDX_COUNT; i++) 5337 if ((cps[i])->flags & CP_NCP) 5338 (cps[i])->Open(sp); 5339 5340 /* Send Up events to all NCPs. */ 5341 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5342 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5343 (cps[i])->Up(sp); 5344 5345 /* if no NCP is starting, all this was in vain, close down */ 5346 sppp_lcp_check_and_close(sp); 5347 } 5348 5349 5350 static const char * 5351 sppp_cp_type_name(u_char type) 5352 { 5353 static char buf[12]; 5354 switch (type) { 5355 case CONF_REQ: return "conf-req"; 5356 case CONF_ACK: return "conf-ack"; 5357 case CONF_NAK: return "conf-nak"; 5358 case CONF_REJ: return "conf-rej"; 5359 case TERM_REQ: return "term-req"; 5360 case TERM_ACK: return "term-ack"; 5361 case CODE_REJ: return "code-rej"; 5362 case PROTO_REJ: return "proto-rej"; 5363 case ECHO_REQ: return "echo-req"; 5364 case ECHO_REPLY: return "echo-reply"; 5365 case DISC_REQ: return "discard-req"; 5366 } 5367 snprintf(buf, sizeof(buf), "0x%x", type); 5368 return buf; 5369 } 5370 5371 static const char * 5372 sppp_auth_type_name(u_short proto, u_char type) 5373 { 5374 static char buf[12]; 5375 switch (proto) { 5376 case PPP_CHAP: 5377 switch (type) { 5378 case CHAP_CHALLENGE: return "challenge"; 5379 case CHAP_RESPONSE: return "response"; 5380 case CHAP_SUCCESS: return "success"; 5381 case CHAP_FAILURE: return "failure"; 5382 } 5383 case PPP_PAP: 5384 switch (type) { 5385 case PAP_REQ: return "req"; 5386 case PAP_ACK: return "ack"; 5387 case PAP_NAK: return "nak"; 5388 } 5389 } 5390 snprintf(buf, sizeof(buf), "0x%x", type); 5391 return buf; 5392 } 5393 5394 static const char * 5395 sppp_lcp_opt_name(u_char opt) 5396 { 5397 static char buf[12]; 5398 switch (opt) { 5399 case LCP_OPT_MRU: return "mru"; 5400 case LCP_OPT_ASYNC_MAP: return "async-map"; 5401 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5402 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5403 case LCP_OPT_MAGIC: return "magic"; 5404 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5405 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5406 } 5407 snprintf(buf, sizeof(buf), "0x%x", opt); 5408 return buf; 5409 } 5410 5411 static const char * 5412 sppp_ipcp_opt_name(u_char opt) 5413 { 5414 static char buf[12]; 5415 switch (opt) { 5416 case IPCP_OPT_ADDRESSES: return "addresses"; 5417 case IPCP_OPT_COMPRESSION: return "compression"; 5418 case IPCP_OPT_ADDRESS: return "address"; 5419 } 5420 snprintf(buf, sizeof(buf), "0x%x", opt); 5421 return buf; 5422 } 5423 5424 #ifdef INET6 5425 static const char * 5426 sppp_ipv6cp_opt_name(u_char opt) 5427 { 5428 static char buf[12]; 5429 switch (opt) { 5430 case IPV6CP_OPT_IFID: return "ifid"; 5431 case IPV6CP_OPT_COMPRESSION: return "compression"; 5432 } 5433 snprintf(buf, sizeof(buf), "0x%x", opt); 5434 return buf; 5435 } 5436 #endif 5437 5438 static const char * 5439 sppp_state_name(int state) 5440 { 5441 switch (state) { 5442 case STATE_INITIAL: return "initial"; 5443 case STATE_STARTING: return "starting"; 5444 case STATE_CLOSED: return "closed"; 5445 case STATE_STOPPED: return "stopped"; 5446 case STATE_CLOSING: return "closing"; 5447 case STATE_STOPPING: return "stopping"; 5448 case STATE_REQ_SENT: return "req-sent"; 5449 case STATE_ACK_RCVD: return "ack-rcvd"; 5450 case STATE_ACK_SENT: return "ack-sent"; 5451 case STATE_OPENED: return "opened"; 5452 } 5453 return "illegal"; 5454 } 5455 5456 static const char * 5457 sppp_phase_name(int phase) 5458 { 5459 switch (phase) { 5460 case SPPP_PHASE_DEAD: return "dead"; 5461 case SPPP_PHASE_ESTABLISH: return "establish"; 5462 case SPPP_PHASE_TERMINATE: return "terminate"; 5463 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5464 case SPPP_PHASE_NETWORK: return "network"; 5465 } 5466 return "illegal"; 5467 } 5468 5469 static const char * 5470 sppp_proto_name(u_short proto) 5471 { 5472 static char buf[12]; 5473 switch (proto) { 5474 case PPP_LCP: return "lcp"; 5475 case PPP_IPCP: return "ipcp"; 5476 case PPP_PAP: return "pap"; 5477 case PPP_CHAP: return "chap"; 5478 case PPP_IPV6CP: return "ipv6cp"; 5479 } 5480 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5481 return buf; 5482 } 5483 5484 static void 5485 sppp_print_bytes(const u_char *p, u_short len) 5486 { 5487 addlog(" %02x", *p++); 5488 while (--len > 0) 5489 addlog("-%02x", *p++); 5490 } 5491 5492 static void 5493 sppp_print_string(const char *p, u_short len) 5494 { 5495 u_char c; 5496 5497 while (len-- > 0) { 5498 c = *p++; 5499 /* 5500 * Print only ASCII chars directly. RFC 1994 recommends 5501 * using only them, but we don't rely on it. */ 5502 if (c < ' ' || c > '~') 5503 addlog("\\x%x", c); 5504 else 5505 addlog("%c", c); 5506 } 5507 } 5508 5509 static const char * 5510 sppp_dotted_quad(uint32_t addr) 5511 { 5512 static char s[16]; 5513 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5514 (int)((addr >> 24) & 0xff), 5515 (int)((addr >> 16) & 0xff), 5516 (int)((addr >> 8) & 0xff), 5517 (int)(addr & 0xff)); 5518 return s; 5519 } 5520 5521 /* a dummy, used to drop uninteresting events */ 5522 static void 5523 sppp_null(struct sppp *unused) 5524 { 5525 /* do just nothing */ 5526 } 5527 /* 5528 * This file is large. Tell emacs to highlight it nevertheless. 5529 * 5530 * Local Variables: 5531 * hilit-auto-highlight-maxout: 120000 5532 * End: 5533 */ 5534
Indexes created Thu Oct 16 14:10:15 GMT 2025