if_spppsubr.c revision 1.129
1 /* $NetBSD: if_spppsubr.c,v 1.129 2014/06/05 23:48:16 rmind 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 1.129 2014/06/05 23:48:16 rmind Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_modular.h" 50 #include "opt_compat_netbsd.h" 51 #endif 52 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 69 #include <net/if.h> 70 #include <net/netisr.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/ppp_defs.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip.h> 80 #include <netinet/tcp.h> 81 #endif 82 #include <net/ethertypes.h> 83 84 #ifdef INET6 85 #include <netinet6/scope6_var.h> 86 #endif 87 88 #ifdef IPX 89 #include <netipx/ipx.h> 90 #include <netipx/ipx_if.h> 91 #endif 92 93 #include <net/if_sppp.h> 94 #include <net/if_spppvar.h> 95 96 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 97 #define LOOPALIVECNT 3 /* loopback detection tries */ 98 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 99 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 100 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 101 102 /* 103 * Interface flags that can be set in an ifconfig command. 104 * 105 * Setting link0 will make the link passive, i.e. it will be marked 106 * as being administrative openable, but won't be opened to begin 107 * with. Incoming calls will be answered, or subsequent calls with 108 * -link1 will cause the administrative open of the LCP layer. 109 * 110 * Setting link1 will cause the link to auto-dial only as packets 111 * arrive to be sent. 112 * 113 * Setting IFF_DEBUG will syslog the option negotiation and state 114 * transitions at level kern.debug. Note: all logs consistently look 115 * like 116 * 117 * <if-name><unit>: <proto-name> <additional info...> 118 * 119 * with <if-name><unit> being something like "bppp0", and <proto-name> 120 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 121 */ 122 123 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 124 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 125 126 #define CONF_REQ 1 /* PPP configure request */ 127 #define CONF_ACK 2 /* PPP configure acknowledge */ 128 #define CONF_NAK 3 /* PPP configure negative ack */ 129 #define CONF_REJ 4 /* PPP configure reject */ 130 #define TERM_REQ 5 /* PPP terminate request */ 131 #define TERM_ACK 6 /* PPP terminate acknowledge */ 132 #define CODE_REJ 7 /* PPP code reject */ 133 #define PROTO_REJ 8 /* PPP protocol reject */ 134 #define ECHO_REQ 9 /* PPP echo request */ 135 #define ECHO_REPLY 10 /* PPP echo reply */ 136 #define DISC_REQ 11 /* PPP discard request */ 137 138 #define LCP_OPT_MRU 1 /* maximum receive unit */ 139 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 140 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 141 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 142 #define LCP_OPT_MAGIC 5 /* magic number */ 143 #define LCP_OPT_RESERVED 6 /* reserved */ 144 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 145 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 146 147 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 148 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 149 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 150 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 151 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 152 153 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 154 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 155 156 #define PAP_REQ 1 /* PAP name/password request */ 157 #define PAP_ACK 2 /* PAP acknowledge */ 158 #define PAP_NAK 3 /* PAP fail */ 159 160 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 161 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 162 #define CHAP_SUCCESS 3 /* CHAP response ok */ 163 #define CHAP_FAILURE 4 /* CHAP response failed */ 164 165 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 166 167 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 168 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 169 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 170 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 171 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 172 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 173 174 /* states are named and numbered according to RFC 1661 */ 175 #define STATE_INITIAL 0 176 #define STATE_STARTING 1 177 #define STATE_CLOSED 2 178 #define STATE_STOPPED 3 179 #define STATE_CLOSING 4 180 #define STATE_STOPPING 5 181 #define STATE_REQ_SENT 6 182 #define STATE_ACK_RCVD 7 183 #define STATE_ACK_SENT 8 184 #define STATE_OPENED 9 185 186 struct ppp_header { 187 uint8_t address; 188 uint8_t control; 189 uint16_t protocol; 190 } __packed; 191 #define PPP_HEADER_LEN sizeof (struct ppp_header) 192 193 struct lcp_header { 194 uint8_t type; 195 uint8_t ident; 196 uint16_t len; 197 } __packed; 198 #define LCP_HEADER_LEN sizeof (struct lcp_header) 199 200 struct cisco_packet { 201 uint32_t type; 202 uint32_t par1; 203 uint32_t par2; 204 uint16_t rel; 205 uint16_t time0; 206 uint16_t time1; 207 } __packed; 208 #define CISCO_PACKET_LEN 18 209 210 /* 211 * We follow the spelling and capitalization of RFC 1661 here, to make 212 * it easier comparing with the standard. Please refer to this RFC in 213 * case you can't make sense out of these abbreviation; it will also 214 * explain the semantics related to the various events and actions. 215 */ 216 struct cp { 217 u_short proto; /* PPP control protocol number */ 218 u_char protoidx; /* index into state table in struct sppp */ 219 u_char flags; 220 #define CP_LCP 0x01 /* this is the LCP */ 221 #define CP_AUTH 0x02 /* this is an authentication protocol */ 222 #define CP_NCP 0x04 /* this is a NCP */ 223 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 224 const char *name; /* name of this control protocol */ 225 /* event handlers */ 226 void (*Up)(struct sppp *sp); 227 void (*Down)(struct sppp *sp); 228 void (*Open)(struct sppp *sp); 229 void (*Close)(struct sppp *sp); 230 void (*TO)(void *sp); 231 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 232 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 233 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 234 /* actions */ 235 void (*tlu)(struct sppp *sp); 236 void (*tld)(struct sppp *sp); 237 void (*tls)(struct sppp *sp); 238 void (*tlf)(struct sppp *sp); 239 void (*scr)(struct sppp *sp); 240 }; 241 242 static struct sppp *spppq; 243 static callout_t keepalive_ch; 244 245 #ifdef INET 246 /* 247 * The following disgusting hack gets around the problem that IP TOS 248 * can't be set yet. We want to put "interactive" traffic on a high 249 * priority queue. To decide if traffic is interactive, we check that 250 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 251 * 252 * XXX is this really still necessary? - joerg - 253 */ 254 static u_short interactive_ports[8] = { 255 0, 513, 0, 0, 256 0, 21, 0, 23, 257 }; 258 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 259 #endif 260 261 /* almost every function needs these */ 262 #define STDDCL \ 263 struct ifnet *ifp = &sp->pp_if; \ 264 int debug = ifp->if_flags & IFF_DEBUG 265 266 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 267 const struct sockaddr *dst, struct rtentry *rt); 268 269 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 270 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 271 272 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 273 struct mbuf *m); 274 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 275 u_char ident, u_short len, void *data); 276 /* static void sppp_cp_timeout(void *arg); */ 277 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 278 int newstate); 279 static void sppp_auth_send(const struct cp *cp, 280 struct sppp *sp, unsigned int type, unsigned int id, 281 ...); 282 283 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 284 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 285 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 286 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 288 289 static void sppp_null(struct sppp *sp); 290 291 static void sppp_lcp_init(struct sppp *sp); 292 static void sppp_lcp_up(struct sppp *sp); 293 static void sppp_lcp_down(struct sppp *sp); 294 static void sppp_lcp_open(struct sppp *sp); 295 static void sppp_lcp_close(struct sppp *sp); 296 static void sppp_lcp_TO(void *sp); 297 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 298 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 299 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 300 static void sppp_lcp_tlu(struct sppp *sp); 301 static void sppp_lcp_tld(struct sppp *sp); 302 static void sppp_lcp_tls(struct sppp *sp); 303 static void sppp_lcp_tlf(struct sppp *sp); 304 static void sppp_lcp_scr(struct sppp *sp); 305 static void sppp_lcp_check_and_close(struct sppp *sp); 306 static int sppp_ncp_check(struct sppp *sp); 307 308 static void sppp_ipcp_init(struct sppp *sp); 309 static void sppp_ipcp_up(struct sppp *sp); 310 static void sppp_ipcp_down(struct sppp *sp); 311 static void sppp_ipcp_open(struct sppp *sp); 312 static void sppp_ipcp_close(struct sppp *sp); 313 static void sppp_ipcp_TO(void *sp); 314 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 315 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 316 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 317 static void sppp_ipcp_tlu(struct sppp *sp); 318 static void sppp_ipcp_tld(struct sppp *sp); 319 static void sppp_ipcp_tls(struct sppp *sp); 320 static void sppp_ipcp_tlf(struct sppp *sp); 321 static void sppp_ipcp_scr(struct sppp *sp); 322 323 static void sppp_ipv6cp_init(struct sppp *sp); 324 static void sppp_ipv6cp_up(struct sppp *sp); 325 static void sppp_ipv6cp_down(struct sppp *sp); 326 static void sppp_ipv6cp_open(struct sppp *sp); 327 static void sppp_ipv6cp_close(struct sppp *sp); 328 static void sppp_ipv6cp_TO(void *sp); 329 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 330 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 332 static void sppp_ipv6cp_tlu(struct sppp *sp); 333 static void sppp_ipv6cp_tld(struct sppp *sp); 334 static void sppp_ipv6cp_tls(struct sppp *sp); 335 static void sppp_ipv6cp_tlf(struct sppp *sp); 336 static void sppp_ipv6cp_scr(struct sppp *sp); 337 338 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 339 static void sppp_pap_init(struct sppp *sp); 340 static void sppp_pap_open(struct sppp *sp); 341 static void sppp_pap_close(struct sppp *sp); 342 static void sppp_pap_TO(void *sp); 343 static void sppp_pap_my_TO(void *sp); 344 static void sppp_pap_tlu(struct sppp *sp); 345 static void sppp_pap_tld(struct sppp *sp); 346 static void sppp_pap_scr(struct sppp *sp); 347 348 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 349 static void sppp_chap_init(struct sppp *sp); 350 static void sppp_chap_open(struct sppp *sp); 351 static void sppp_chap_close(struct sppp *sp); 352 static void sppp_chap_TO(void *sp); 353 static void sppp_chap_tlu(struct sppp *sp); 354 static void sppp_chap_tld(struct sppp *sp); 355 static void sppp_chap_scr(struct sppp *sp); 356 357 static const char *sppp_auth_type_name(u_short proto, u_char type); 358 static const char *sppp_cp_type_name(u_char type); 359 static const char *sppp_dotted_quad(uint32_t addr); 360 static const char *sppp_ipcp_opt_name(u_char opt); 361 #ifdef INET6 362 static const char *sppp_ipv6cp_opt_name(u_char opt); 363 #endif 364 static const char *sppp_lcp_opt_name(u_char opt); 365 static const char *sppp_phase_name(int phase); 366 static const char *sppp_proto_name(u_short proto); 367 static const char *sppp_state_name(int state); 368 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 369 #ifdef INET 370 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 371 uint32_t *srcmask); 372 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 373 static void sppp_clear_ip_addrs(struct sppp *sp); 374 #endif 375 static void sppp_keepalive(void *dummy); 376 static void sppp_phase_network(struct sppp *sp); 377 static void sppp_print_bytes(const u_char *p, u_short len); 378 static void sppp_print_string(const char *p, u_short len); 379 #ifdef INET6 380 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 381 struct in6_addr *dst, struct in6_addr *srcmask); 382 #ifdef IPV6CP_MYIFID_DYN 383 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 384 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 #endif 386 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 387 #endif 388 389 /* our control protocol descriptors */ 390 static const struct cp lcp = { 391 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 392 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 393 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 394 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 395 sppp_lcp_scr 396 }; 397 398 static const struct cp ipcp = { 399 PPP_IPCP, IDX_IPCP, 400 #ifdef INET 401 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 402 #else 403 0, 404 #endif 405 "ipcp", 406 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 407 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 408 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 409 sppp_ipcp_scr 410 }; 411 412 static const struct cp ipv6cp = { 413 PPP_IPV6CP, IDX_IPV6CP, 414 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 415 CP_NCP, 416 #else 417 0, 418 #endif 419 "ipv6cp", 420 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 421 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 422 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 423 sppp_ipv6cp_scr 424 }; 425 426 static const struct cp pap = { 427 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 428 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 429 sppp_pap_TO, 0, 0, 0, 430 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 431 sppp_pap_scr 432 }; 433 434 static const struct cp chap = { 435 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 436 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 437 sppp_chap_TO, 0, 0, 0, 438 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 439 sppp_chap_scr 440 }; 441 442 static const struct cp *cps[IDX_COUNT] = { 443 &lcp, /* IDX_LCP */ 444 &ipcp, /* IDX_IPCP */ 445 &ipv6cp, /* IDX_IPV6CP */ 446 &pap, /* IDX_PAP */ 447 &chap, /* IDX_CHAP */ 448 }; 449 450 451 void spppattach(int); 452 void 453 /*ARGSUSED*/ 454 spppattach(int count) 455 { 456 } 457 458 /* 459 * Exported functions, comprising our interface to the lower layer. 460 */ 461 462 /* 463 * Process the received packet. 464 */ 465 void 466 sppp_input(struct ifnet *ifp, struct mbuf *m) 467 { 468 struct ppp_header *h = NULL; 469 pktqueue_t *pktq = NULL; 470 struct ifqueue *inq = NULL; 471 uint16_t protocol; 472 int s; 473 struct sppp *sp = (struct sppp *)ifp; 474 int debug = ifp->if_flags & IFF_DEBUG; 475 int isr = 0; 476 477 if (ifp->if_flags & IFF_UP) { 478 /* Count received bytes, add hardware framing */ 479 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 480 /* Note time of last receive */ 481 sp->pp_last_receive = time_uptime; 482 } 483 484 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 485 /* Too small packet, drop it. */ 486 if (debug) 487 log(LOG_DEBUG, 488 "%s: input packet is too small, %d bytes\n", 489 ifp->if_xname, m->m_pkthdr.len); 490 drop: 491 ++ifp->if_ierrors; 492 ++ifp->if_iqdrops; 493 m_freem(m); 494 return; 495 } 496 497 if (sp->pp_flags & PP_NOFRAMING) { 498 memcpy(&protocol, mtod(m, void *), 2); 499 protocol = ntohs(protocol); 500 m_adj(m, 2); 501 } else { 502 503 /* Get PPP header. */ 504 h = mtod(m, struct ppp_header *); 505 m_adj(m, PPP_HEADER_LEN); 506 507 switch (h->address) { 508 case PPP_ALLSTATIONS: 509 if (h->control != PPP_UI) 510 goto invalid; 511 if (sp->pp_flags & PP_CISCO) { 512 if (debug) 513 log(LOG_DEBUG, 514 "%s: PPP packet in Cisco mode " 515 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 516 ifp->if_xname, 517 h->address, h->control, ntohs(h->protocol)); 518 goto drop; 519 } 520 break; 521 case CISCO_MULTICAST: 522 case CISCO_UNICAST: 523 /* Don't check the control field here (RFC 1547). */ 524 if (! (sp->pp_flags & PP_CISCO)) { 525 if (debug) 526 log(LOG_DEBUG, 527 "%s: Cisco packet in PPP mode " 528 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 529 ifp->if_xname, 530 h->address, h->control, ntohs(h->protocol)); 531 goto drop; 532 } 533 switch (ntohs(h->protocol)) { 534 default: 535 ++ifp->if_noproto; 536 goto invalid; 537 case CISCO_KEEPALIVE: 538 sppp_cisco_input((struct sppp *) ifp, m); 539 m_freem(m); 540 return; 541 #ifdef INET 542 case ETHERTYPE_IP: 543 pktq = ip_pktq; 544 break; 545 #endif 546 #ifdef INET6 547 case ETHERTYPE_IPV6: 548 pktq = ip6_pktq; 549 break; 550 #endif 551 #ifdef IPX 552 case ETHERTYPE_IPX: 553 isr = NETISR_IPX; 554 inq = &ipxintrq; 555 break; 556 #endif 557 } 558 goto queue_pkt; 559 default: /* Invalid PPP packet. */ 560 invalid: 561 if (debug) 562 log(LOG_DEBUG, 563 "%s: invalid input packet " 564 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 565 ifp->if_xname, 566 h->address, h->control, ntohs(h->protocol)); 567 goto drop; 568 } 569 protocol = ntohs(h->protocol); 570 } 571 572 switch (protocol) { 573 default: 574 if (sp->state[IDX_LCP] == STATE_OPENED) { 575 uint16_t prot = htons(protocol); 576 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 577 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 578 &prot); 579 } 580 if (debug) 581 log(LOG_DEBUG, 582 "%s: invalid input protocol " 583 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 584 ++ifp->if_noproto; 585 goto drop; 586 case PPP_LCP: 587 sppp_cp_input(&lcp, sp, m); 588 m_freem(m); 589 return; 590 case PPP_PAP: 591 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 592 sppp_pap_input(sp, m); 593 m_freem(m); 594 return; 595 case PPP_CHAP: 596 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 597 sppp_chap_input(sp, m); 598 m_freem(m); 599 return; 600 #ifdef INET 601 case PPP_IPCP: 602 if (sp->pp_phase == SPPP_PHASE_NETWORK) 603 sppp_cp_input(&ipcp, sp, m); 604 m_freem(m); 605 return; 606 case PPP_IP: 607 if (sp->state[IDX_IPCP] == STATE_OPENED) { 608 sp->pp_last_activity = time_uptime; 609 pktq = ip_pktq; 610 } 611 break; 612 #endif 613 #ifdef INET6 614 case PPP_IPV6CP: 615 if (sp->pp_phase == SPPP_PHASE_NETWORK) 616 sppp_cp_input(&ipv6cp, sp, m); 617 m_freem(m); 618 return; 619 620 case PPP_IPV6: 621 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 622 sp->pp_last_activity = time_uptime; 623 pktq = ip6_pktq; 624 } 625 break; 626 #endif 627 #ifdef IPX 628 case PPP_IPX: 629 /* IPX IPXCP not implemented yet */ 630 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 631 isr = NETISR_IPX; 632 inq = &ipxintrq; 633 } 634 break; 635 #endif 636 } 637 638 queue_pkt: 639 if (! (ifp->if_flags & IFF_UP) || ! inq) 640 goto drop; 641 642 /* Check queue. */ 643 if (__predict_true(pktq)) { 644 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 645 goto drop; 646 } 647 return; 648 } 649 650 s = splnet(); 651 if (IF_QFULL(inq)) { 652 /* Queue overflow. */ 653 IF_DROP(inq); 654 splx(s); 655 if (debug) 656 log(LOG_DEBUG, "%s: protocol queue overflow\n", 657 ifp->if_xname); 658 goto drop; 659 } 660 IF_ENQUEUE(inq, m); 661 schednetisr(isr); 662 splx(s); 663 } 664 665 /* 666 * Enqueue transmit packet. 667 */ 668 static int 669 sppp_output(struct ifnet *ifp, struct mbuf *m, 670 const struct sockaddr *dst, struct rtentry *rt) 671 { 672 struct sppp *sp = (struct sppp *) ifp; 673 struct ppp_header *h = NULL; 674 struct ifqueue *ifq = NULL; /* XXX */ 675 int s, error = 0; 676 uint16_t protocol; 677 ALTQ_DECL(struct altq_pktattr pktattr;) 678 679 s = splnet(); 680 681 sp->pp_last_activity = time_uptime; 682 683 if ((ifp->if_flags & IFF_UP) == 0 || 684 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 685 m_freem(m); 686 splx(s); 687 return (ENETDOWN); 688 } 689 690 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 691 /* 692 * Interface is not yet running, but auto-dial. Need 693 * to start LCP for it. 694 */ 695 ifp->if_flags |= IFF_RUNNING; 696 splx(s); 697 lcp.Open(sp); 698 s = splnet(); 699 } 700 701 /* 702 * If the queueing discipline needs packet classification, 703 * do it before prepending link headers. 704 */ 705 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 706 707 #ifdef INET 708 if (dst->sa_family == AF_INET) { 709 struct ip *ip = NULL; 710 struct tcphdr *th = NULL; 711 712 if (m->m_len >= sizeof(struct ip)) { 713 ip = mtod(m, struct ip *); 714 if (ip->ip_p == IPPROTO_TCP && 715 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 716 sizeof(struct tcphdr)) { 717 th = (struct tcphdr *) 718 ((char *)ip + (ip->ip_hl << 2)); 719 } 720 } else 721 ip = NULL; 722 723 /* 724 * When using dynamic local IP address assignment by using 725 * 0.0.0.0 as a local address, the first TCP session will 726 * not connect because the local TCP checksum is computed 727 * using 0.0.0.0 which will later become our real IP address 728 * so the TCP checksum computed at the remote end will 729 * become invalid. So we 730 * - don't let packets with src ip addr 0 thru 731 * - we flag TCP packets with src ip 0 as an error 732 */ 733 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 734 uint8_t proto = ip->ip_p; 735 736 m_freem(m); 737 splx(s); 738 if (proto == IPPROTO_TCP) 739 return (EADDRNOTAVAIL); 740 else 741 return (0); 742 } 743 744 /* 745 * Put low delay, telnet, rlogin and ftp control packets 746 * in front of the queue. 747 */ 748 749 if (!IF_QFULL(&sp->pp_fastq) && 750 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 751 (th && (INTERACTIVE(ntohs(th->th_sport)) || 752 INTERACTIVE(ntohs(th->th_dport)))))) 753 ifq = &sp->pp_fastq; 754 } 755 #endif 756 757 #ifdef INET6 758 if (dst->sa_family == AF_INET6) { 759 /* XXX do something tricky here? */ 760 } 761 #endif 762 763 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 764 /* 765 * Prepend general data packet PPP header. For now, IP only. 766 */ 767 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 768 if (! m) { 769 if (ifp->if_flags & IFF_DEBUG) 770 log(LOG_DEBUG, "%s: no memory for transmit header\n", 771 ifp->if_xname); 772 ++ifp->if_oerrors; 773 splx(s); 774 return (ENOBUFS); 775 } 776 /* 777 * May want to check size of packet 778 * (albeit due to the implementation it's always enough) 779 */ 780 h = mtod(m, struct ppp_header *); 781 if (sp->pp_flags & PP_CISCO) { 782 h->address = CISCO_UNICAST; /* unicast address */ 783 h->control = 0; 784 } else { 785 h->address = PPP_ALLSTATIONS; /* broadcast address */ 786 h->control = PPP_UI; /* Unnumbered Info */ 787 } 788 } 789 790 switch (dst->sa_family) { 791 #ifdef INET 792 case AF_INET: /* Internet Protocol */ 793 if (sp->pp_flags & PP_CISCO) 794 protocol = htons(ETHERTYPE_IP); 795 else { 796 /* 797 * Don't choke with an ENETDOWN early. It's 798 * possible that we just started dialing out, 799 * so don't drop the packet immediately. If 800 * we notice that we run out of buffer space 801 * below, we will however remember that we are 802 * not ready to carry IP packets, and return 803 * ENETDOWN, as opposed to ENOBUFS. 804 */ 805 protocol = htons(PPP_IP); 806 if (sp->state[IDX_IPCP] != STATE_OPENED) 807 error = ENETDOWN; 808 } 809 break; 810 #endif 811 #ifdef INET6 812 case AF_INET6: /* Internet Protocol version 6 */ 813 if (sp->pp_flags & PP_CISCO) 814 protocol = htons(ETHERTYPE_IPV6); 815 else { 816 /* 817 * Don't choke with an ENETDOWN early. It's 818 * possible that we just started dialing out, 819 * so don't drop the packet immediately. If 820 * we notice that we run out of buffer space 821 * below, we will however remember that we are 822 * not ready to carry IP packets, and return 823 * ENETDOWN, as opposed to ENOBUFS. 824 */ 825 protocol = htons(PPP_IPV6); 826 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 827 error = ENETDOWN; 828 } 829 break; 830 #endif 831 #ifdef IPX 832 case AF_IPX: /* Novell IPX Protocol */ 833 protocol = htons((sp->pp_flags & PP_CISCO) ? 834 ETHERTYPE_IPX : PPP_IPX); 835 break; 836 #endif 837 default: 838 m_freem(m); 839 ++ifp->if_oerrors; 840 splx(s); 841 return (EAFNOSUPPORT); 842 } 843 844 if (sp->pp_flags & PP_NOFRAMING) { 845 M_PREPEND(m, 2, M_DONTWAIT); 846 if (m == NULL) { 847 if (ifp->if_flags & IFF_DEBUG) 848 log(LOG_DEBUG, "%s: no memory for transmit header\n", 849 ifp->if_xname); 850 ++ifp->if_oerrors; 851 splx(s); 852 return (ENOBUFS); 853 } 854 *mtod(m, uint16_t *) = protocol; 855 } else { 856 h->protocol = protocol; 857 } 858 859 860 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 861 862 if (error == 0) { 863 /* 864 * Count output packets and bytes. 865 * The packet length includes header + additional hardware 866 * framing according to RFC 1333. 867 */ 868 if (!(ifp->if_flags & IFF_OACTIVE)) 869 (*ifp->if_start)(ifp); 870 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 871 } 872 splx(s); 873 return error; 874 } 875 876 void 877 sppp_attach(struct ifnet *ifp) 878 { 879 struct sppp *sp = (struct sppp *) ifp; 880 881 /* Initialize keepalive handler. */ 882 if (! spppq) { 883 callout_init(&keepalive_ch, 0); 884 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 885 } 886 887 /* Insert new entry into the keepalive list. */ 888 sp->pp_next = spppq; 889 spppq = sp; 890 891 sp->pp_if.if_type = IFT_PPP; 892 sp->pp_if.if_output = sppp_output; 893 sp->pp_fastq.ifq_maxlen = 32; 894 sp->pp_cpq.ifq_maxlen = 20; 895 sp->pp_loopcnt = 0; 896 sp->pp_alivecnt = 0; 897 sp->pp_last_activity = 0; 898 sp->pp_last_receive = 0; 899 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 900 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 901 sp->pp_idle_timeout = 0; 902 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 903 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 904 sp->pp_auth_failures = 0; 905 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 906 sp->pp_phase = SPPP_PHASE_DEAD; 907 sp->pp_up = lcp.Up; 908 sp->pp_down = lcp.Down; 909 910 if_alloc_sadl(ifp); 911 912 memset(&sp->myauth, 0, sizeof sp->myauth); 913 memset(&sp->hisauth, 0, sizeof sp->hisauth); 914 sppp_lcp_init(sp); 915 sppp_ipcp_init(sp); 916 sppp_ipv6cp_init(sp); 917 sppp_pap_init(sp); 918 sppp_chap_init(sp); 919 } 920 921 void 922 sppp_detach(struct ifnet *ifp) 923 { 924 struct sppp **q, *p, *sp = (struct sppp *) ifp; 925 926 /* Remove the entry from the keepalive list. */ 927 for (q = &spppq; (p = *q); q = &p->pp_next) 928 if (p == sp) { 929 *q = p->pp_next; 930 break; 931 } 932 933 /* Stop keepalive handler. */ 934 if (! spppq) { 935 callout_stop(&keepalive_ch); 936 } 937 938 callout_stop(&sp->ch[IDX_LCP]); 939 callout_stop(&sp->ch[IDX_IPCP]); 940 callout_stop(&sp->ch[IDX_PAP]); 941 callout_stop(&sp->ch[IDX_CHAP]); 942 #ifdef INET6 943 callout_stop(&sp->ch[IDX_IPV6CP]); 944 #endif 945 callout_stop(&sp->pap_my_to_ch); 946 947 /* free authentication info */ 948 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 949 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 950 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 951 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 952 953 #if 0 /* done in if_detach() */ 954 if_free_sadl(ifp); 955 #endif 956 } 957 958 /* 959 * Flush the interface output queue. 960 */ 961 void 962 sppp_flush(struct ifnet *ifp) 963 { 964 struct sppp *sp = (struct sppp *) ifp; 965 966 IFQ_PURGE(&sp->pp_if.if_snd); 967 IF_PURGE(&sp->pp_fastq); 968 IF_PURGE(&sp->pp_cpq); 969 } 970 971 /* 972 * Check if the output queue is empty. 973 */ 974 int 975 sppp_isempty(struct ifnet *ifp) 976 { 977 struct sppp *sp = (struct sppp *) ifp; 978 int empty, s; 979 980 s = splnet(); 981 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 982 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 983 splx(s); 984 return (empty); 985 } 986 987 /* 988 * Get next packet to send. 989 */ 990 struct mbuf * 991 sppp_dequeue(struct ifnet *ifp) 992 { 993 struct sppp *sp = (struct sppp *) ifp; 994 struct mbuf *m; 995 int s; 996 997 s = splnet(); 998 /* 999 * Process only the control protocol queue until we have at 1000 * least one NCP open. 1001 * 1002 * Do always serve all three queues in Cisco mode. 1003 */ 1004 IF_DEQUEUE(&sp->pp_cpq, m); 1005 if (m == NULL && 1006 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1007 IF_DEQUEUE(&sp->pp_fastq, m); 1008 if (m == NULL) 1009 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1010 } 1011 splx(s); 1012 return m; 1013 } 1014 1015 /* 1016 * Process an ioctl request. Called on low priority level. 1017 */ 1018 int 1019 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1020 { 1021 struct lwp *l = curlwp; /* XXX */ 1022 struct ifreq *ifr = (struct ifreq *) data; 1023 struct sppp *sp = (struct sppp *) ifp; 1024 int s, error=0, going_up, going_down, newmode; 1025 1026 s = splnet(); 1027 switch (cmd) { 1028 case SIOCINITIFADDR: 1029 break; 1030 1031 case SIOCSIFFLAGS: 1032 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1033 break; 1034 going_up = ifp->if_flags & IFF_UP && 1035 (ifp->if_flags & IFF_RUNNING) == 0; 1036 going_down = (ifp->if_flags & IFF_UP) == 0 && 1037 ifp->if_flags & IFF_RUNNING; 1038 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1039 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1040 /* sanity */ 1041 newmode = IFF_PASSIVE; 1042 ifp->if_flags &= ~IFF_AUTO; 1043 } 1044 1045 if (going_up || going_down) 1046 lcp.Close(sp); 1047 if (going_up && newmode == 0) { 1048 /* neither auto-dial nor passive */ 1049 ifp->if_flags |= IFF_RUNNING; 1050 if (!(sp->pp_flags & PP_CISCO)) 1051 lcp.Open(sp); 1052 } else if (going_down) { 1053 sppp_flush(ifp); 1054 ifp->if_flags &= ~IFF_RUNNING; 1055 } 1056 1057 break; 1058 1059 case SIOCSIFMTU: 1060 if (ifr->ifr_mtu < PPP_MINMRU || 1061 ifr->ifr_mtu > sp->lcp.their_mru) { 1062 error = EINVAL; 1063 break; 1064 } 1065 /*FALLTHROUGH*/ 1066 case SIOCGIFMTU: 1067 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1068 error = 0; 1069 break; 1070 case SIOCADDMULTI: 1071 case SIOCDELMULTI: 1072 break; 1073 1074 case SPPPSETAUTHCFG: 1075 case SPPPSETLCPCFG: 1076 case SPPPSETIDLETO: 1077 case SPPPSETAUTHFAILURE: 1078 case SPPPSETDNSOPTS: 1079 case SPPPSETKEEPALIVE: 1080 #if defined(COMPAT_50) || defined(MODULAR) 1081 case __SPPPSETIDLETO50: 1082 case __SPPPSETKEEPALIVE50: 1083 #endif /* COMPAT_50 || MODULAR */ 1084 error = kauth_authorize_network(l->l_cred, 1085 KAUTH_NETWORK_INTERFACE, 1086 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1087 NULL); 1088 if (error) 1089 break; 1090 error = sppp_params(sp, cmd, data); 1091 break; 1092 1093 case SPPPGETAUTHCFG: 1094 case SPPPGETLCPCFG: 1095 case SPPPGETAUTHFAILURES: 1096 error = kauth_authorize_network(l->l_cred, 1097 KAUTH_NETWORK_INTERFACE, 1098 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1099 NULL); 1100 if (error) 1101 break; 1102 error = sppp_params(sp, cmd, data); 1103 break; 1104 1105 case SPPPGETSTATUS: 1106 case SPPPGETSTATUSNCP: 1107 case SPPPGETIDLETO: 1108 case SPPPGETDNSOPTS: 1109 case SPPPGETDNSADDRS: 1110 case SPPPGETKEEPALIVE: 1111 #if defined(COMPAT_50) || defined(MODULAR) 1112 case __SPPPGETIDLETO50: 1113 case __SPPPGETKEEPALIVE50: 1114 #endif /* COMPAT_50 || MODULAR */ 1115 error = sppp_params(sp, cmd, data); 1116 break; 1117 1118 default: 1119 error = ifioctl_common(ifp, cmd, data); 1120 break; 1121 } 1122 splx(s); 1123 return (error); 1124 } 1125 1126 1127 /* 1128 * Cisco framing implementation. 1129 */ 1130 1131 /* 1132 * Handle incoming Cisco keepalive protocol packets. 1133 */ 1134 static void 1135 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1136 { 1137 STDDCL; 1138 struct cisco_packet *h; 1139 #ifdef INET 1140 uint32_t me, mymask = 0; /* XXX: GCC */ 1141 #endif 1142 1143 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1144 if (debug) 1145 log(LOG_DEBUG, 1146 "%s: cisco invalid packet length: %d bytes\n", 1147 ifp->if_xname, m->m_pkthdr.len); 1148 return; 1149 } 1150 h = mtod(m, struct cisco_packet *); 1151 if (debug) 1152 log(LOG_DEBUG, 1153 "%s: cisco input: %d bytes " 1154 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1155 ifp->if_xname, m->m_pkthdr.len, 1156 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1157 (u_int)h->time0, (u_int)h->time1); 1158 switch (ntohl(h->type)) { 1159 default: 1160 if (debug) 1161 addlog("%s: cisco unknown packet type: 0x%x\n", 1162 ifp->if_xname, ntohl(h->type)); 1163 break; 1164 case CISCO_ADDR_REPLY: 1165 /* Reply on address request, ignore */ 1166 break; 1167 case CISCO_KEEPALIVE_REQ: 1168 sp->pp_alivecnt = 0; 1169 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1170 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1171 /* Local and remote sequence numbers are equal. 1172 * Probably, the line is in loopback mode. */ 1173 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1174 printf ("%s: loopback\n", 1175 ifp->if_xname); 1176 sp->pp_loopcnt = 0; 1177 if (ifp->if_flags & IFF_UP) { 1178 if_down(ifp); 1179 IF_PURGE(&sp->pp_cpq); 1180 } 1181 } 1182 ++sp->pp_loopcnt; 1183 1184 /* Generate new local sequence number */ 1185 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1186 break; 1187 } 1188 sp->pp_loopcnt = 0; 1189 if (! (ifp->if_flags & IFF_UP) && 1190 (ifp->if_flags & IFF_RUNNING)) { 1191 if_up(ifp); 1192 } 1193 break; 1194 case CISCO_ADDR_REQ: 1195 #ifdef INET 1196 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1197 if (me != 0L) 1198 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1199 #endif 1200 break; 1201 } 1202 } 1203 1204 /* 1205 * Send Cisco keepalive packet. 1206 */ 1207 static void 1208 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1209 { 1210 STDDCL; 1211 struct ppp_header *h; 1212 struct cisco_packet *ch; 1213 struct mbuf *m; 1214 uint32_t t; 1215 1216 t = time_uptime * 1000; 1217 MGETHDR(m, M_DONTWAIT, MT_DATA); 1218 if (! m) 1219 return; 1220 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1221 m->m_pkthdr.rcvif = 0; 1222 1223 h = mtod(m, struct ppp_header *); 1224 h->address = CISCO_MULTICAST; 1225 h->control = 0; 1226 h->protocol = htons(CISCO_KEEPALIVE); 1227 1228 ch = (struct cisco_packet *)(h + 1); 1229 ch->type = htonl(type); 1230 ch->par1 = htonl(par1); 1231 ch->par2 = htonl(par2); 1232 ch->rel = -1; 1233 1234 ch->time0 = htons((u_short)(t >> 16)); 1235 ch->time1 = htons((u_short) t); 1236 1237 if (debug) 1238 log(LOG_DEBUG, 1239 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1240 ifp->if_xname, ntohl(ch->type), ch->par1, 1241 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1242 (u_int)ch->time1); 1243 1244 if (IF_QFULL(&sp->pp_cpq)) { 1245 IF_DROP(&sp->pp_fastq); 1246 IF_DROP(&ifp->if_snd); 1247 m_freem(m); 1248 ++ifp->if_oerrors; 1249 return; 1250 } else 1251 IF_ENQUEUE(&sp->pp_cpq, m); 1252 if (! (ifp->if_flags & IFF_OACTIVE)) 1253 (*ifp->if_start)(ifp); 1254 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1255 } 1256 1257 /* 1258 * PPP protocol implementation. 1259 */ 1260 1261 /* 1262 * Send PPP control protocol packet. 1263 */ 1264 static void 1265 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1266 u_char ident, u_short len, void *data) 1267 { 1268 STDDCL; 1269 struct lcp_header *lh; 1270 struct mbuf *m; 1271 size_t pkthdrlen; 1272 1273 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1274 1275 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1276 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1277 MGETHDR(m, M_DONTWAIT, MT_DATA); 1278 if (! m) 1279 return; 1280 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1281 m->m_pkthdr.rcvif = 0; 1282 1283 if (sp->pp_flags & PP_NOFRAMING) { 1284 *mtod(m, uint16_t *) = htons(proto); 1285 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1286 } else { 1287 struct ppp_header *h; 1288 h = mtod(m, struct ppp_header *); 1289 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1290 h->control = PPP_UI; /* Unnumbered Info */ 1291 h->protocol = htons(proto); /* Link Control Protocol */ 1292 lh = (struct lcp_header *)(h + 1); 1293 } 1294 lh->type = type; 1295 lh->ident = ident; 1296 lh->len = htons(LCP_HEADER_LEN + len); 1297 if (len) 1298 bcopy (data, lh + 1, len); 1299 1300 if (debug) { 1301 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1302 ifp->if_xname, 1303 sppp_proto_name(proto), 1304 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1305 if (len) 1306 sppp_print_bytes((u_char *)(lh + 1), len); 1307 addlog(">\n"); 1308 } 1309 if (IF_QFULL(&sp->pp_cpq)) { 1310 IF_DROP(&sp->pp_fastq); 1311 IF_DROP(&ifp->if_snd); 1312 m_freem(m); 1313 ++ifp->if_oerrors; 1314 return; 1315 } else 1316 IF_ENQUEUE(&sp->pp_cpq, m); 1317 if (! (ifp->if_flags & IFF_OACTIVE)) 1318 (*ifp->if_start)(ifp); 1319 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1320 } 1321 1322 /* 1323 * Handle incoming PPP control protocol packets. 1324 */ 1325 static void 1326 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1327 { 1328 STDDCL; 1329 struct lcp_header *h; 1330 int printlen, len = m->m_pkthdr.len; 1331 int rv; 1332 u_char *p; 1333 uint32_t u32; 1334 1335 if (len < 4) { 1336 if (debug) 1337 log(LOG_DEBUG, 1338 "%s: %s invalid packet length: %d bytes\n", 1339 ifp->if_xname, cp->name, len); 1340 return; 1341 } 1342 h = mtod(m, struct lcp_header *); 1343 if (debug) { 1344 printlen = ntohs(h->len); 1345 log(LOG_DEBUG, 1346 "%s: %s input(%s): <%s id=0x%x len=%d", 1347 ifp->if_xname, cp->name, 1348 sppp_state_name(sp->state[cp->protoidx]), 1349 sppp_cp_type_name(h->type), h->ident, printlen); 1350 if (len < printlen) 1351 printlen = len; 1352 if (printlen > 4) 1353 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1354 addlog(">\n"); 1355 } 1356 if (len > ntohs(h->len)) 1357 len = ntohs(h->len); 1358 p = (u_char *)(h + 1); 1359 switch (h->type) { 1360 case CONF_REQ: 1361 if (len < 4) { 1362 if (debug) 1363 addlog("%s: %s invalid conf-req length %d\n", 1364 ifp->if_xname, cp->name, 1365 len); 1366 ++ifp->if_ierrors; 1367 break; 1368 } 1369 /* handle states where RCR doesn't get a SCA/SCN */ 1370 switch (sp->state[cp->protoidx]) { 1371 case STATE_CLOSING: 1372 case STATE_STOPPING: 1373 return; 1374 case STATE_CLOSED: 1375 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1376 0, 0); 1377 return; 1378 } 1379 rv = (cp->RCR)(sp, h, len); 1380 if (rv < 0) { 1381 /* fatal error, shut down */ 1382 (cp->tld)(sp); 1383 sppp_lcp_tlf(sp); 1384 return; 1385 } 1386 switch (sp->state[cp->protoidx]) { 1387 case STATE_OPENED: 1388 (cp->tld)(sp); 1389 (cp->scr)(sp); 1390 /* fall through... */ 1391 case STATE_ACK_SENT: 1392 case STATE_REQ_SENT: 1393 sppp_cp_change_state(cp, sp, rv? 1394 STATE_ACK_SENT: STATE_REQ_SENT); 1395 break; 1396 case STATE_STOPPED: 1397 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1398 (cp->scr)(sp); 1399 sppp_cp_change_state(cp, sp, rv? 1400 STATE_ACK_SENT: STATE_REQ_SENT); 1401 break; 1402 case STATE_ACK_RCVD: 1403 if (rv) { 1404 sppp_cp_change_state(cp, sp, STATE_OPENED); 1405 if (debug) 1406 log(LOG_DEBUG, "%s: %s tlu\n", 1407 ifp->if_xname, 1408 cp->name); 1409 (cp->tlu)(sp); 1410 } else 1411 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1412 break; 1413 default: 1414 printf("%s: %s illegal %s in state %s\n", 1415 ifp->if_xname, cp->name, 1416 sppp_cp_type_name(h->type), 1417 sppp_state_name(sp->state[cp->protoidx])); 1418 ++ifp->if_ierrors; 1419 } 1420 break; 1421 case CONF_ACK: 1422 if (h->ident != sp->confid[cp->protoidx]) { 1423 if (debug) 1424 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1425 ifp->if_xname, cp->name, 1426 h->ident, sp->confid[cp->protoidx]); 1427 ++ifp->if_ierrors; 1428 break; 1429 } 1430 switch (sp->state[cp->protoidx]) { 1431 case STATE_CLOSED: 1432 case STATE_STOPPED: 1433 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1434 break; 1435 case STATE_CLOSING: 1436 case STATE_STOPPING: 1437 break; 1438 case STATE_REQ_SENT: 1439 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1440 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1441 break; 1442 case STATE_OPENED: 1443 (cp->tld)(sp); 1444 /* fall through */ 1445 case STATE_ACK_RCVD: 1446 (cp->scr)(sp); 1447 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1448 break; 1449 case STATE_ACK_SENT: 1450 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1451 sppp_cp_change_state(cp, sp, STATE_OPENED); 1452 if (debug) 1453 log(LOG_DEBUG, "%s: %s tlu\n", 1454 ifp->if_xname, cp->name); 1455 (cp->tlu)(sp); 1456 break; 1457 default: 1458 printf("%s: %s illegal %s in state %s\n", 1459 ifp->if_xname, cp->name, 1460 sppp_cp_type_name(h->type), 1461 sppp_state_name(sp->state[cp->protoidx])); 1462 ++ifp->if_ierrors; 1463 } 1464 break; 1465 case CONF_NAK: 1466 case CONF_REJ: 1467 if (h->ident != sp->confid[cp->protoidx]) { 1468 if (debug) 1469 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1470 ifp->if_xname, cp->name, 1471 h->ident, sp->confid[cp->protoidx]); 1472 ++ifp->if_ierrors; 1473 break; 1474 } 1475 if (h->type == CONF_NAK) 1476 (cp->RCN_nak)(sp, h, len); 1477 else /* CONF_REJ */ 1478 (cp->RCN_rej)(sp, h, len); 1479 1480 switch (sp->state[cp->protoidx]) { 1481 case STATE_CLOSED: 1482 case STATE_STOPPED: 1483 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1484 break; 1485 case STATE_REQ_SENT: 1486 case STATE_ACK_SENT: 1487 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1488 (cp->scr)(sp); 1489 break; 1490 case STATE_OPENED: 1491 (cp->tld)(sp); 1492 /* fall through */ 1493 case STATE_ACK_RCVD: 1494 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1495 (cp->scr)(sp); 1496 break; 1497 case STATE_CLOSING: 1498 case STATE_STOPPING: 1499 break; 1500 default: 1501 printf("%s: %s illegal %s in state %s\n", 1502 ifp->if_xname, cp->name, 1503 sppp_cp_type_name(h->type), 1504 sppp_state_name(sp->state[cp->protoidx])); 1505 ++ifp->if_ierrors; 1506 } 1507 break; 1508 1509 case TERM_REQ: 1510 switch (sp->state[cp->protoidx]) { 1511 case STATE_ACK_RCVD: 1512 case STATE_ACK_SENT: 1513 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1514 /* fall through */ 1515 case STATE_CLOSED: 1516 case STATE_STOPPED: 1517 case STATE_CLOSING: 1518 case STATE_STOPPING: 1519 case STATE_REQ_SENT: 1520 sta: 1521 /* Send Terminate-Ack packet. */ 1522 if (debug) 1523 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1524 ifp->if_xname, cp->name); 1525 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1526 break; 1527 case STATE_OPENED: 1528 (cp->tld)(sp); 1529 sp->rst_counter[cp->protoidx] = 0; 1530 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1531 goto sta; 1532 default: 1533 printf("%s: %s illegal %s in state %s\n", 1534 ifp->if_xname, cp->name, 1535 sppp_cp_type_name(h->type), 1536 sppp_state_name(sp->state[cp->protoidx])); 1537 ++ifp->if_ierrors; 1538 } 1539 break; 1540 case TERM_ACK: 1541 switch (sp->state[cp->protoidx]) { 1542 case STATE_CLOSED: 1543 case STATE_STOPPED: 1544 case STATE_REQ_SENT: 1545 case STATE_ACK_SENT: 1546 break; 1547 case STATE_CLOSING: 1548 (cp->tlf)(sp); 1549 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1550 sppp_lcp_check_and_close(sp); 1551 break; 1552 case STATE_STOPPING: 1553 (cp->tlf)(sp); 1554 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1555 sppp_lcp_check_and_close(sp); 1556 break; 1557 case STATE_ACK_RCVD: 1558 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1559 break; 1560 case STATE_OPENED: 1561 (cp->tld)(sp); 1562 (cp->scr)(sp); 1563 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1564 break; 1565 default: 1566 printf("%s: %s illegal %s in state %s\n", 1567 ifp->if_xname, cp->name, 1568 sppp_cp_type_name(h->type), 1569 sppp_state_name(sp->state[cp->protoidx])); 1570 ++ifp->if_ierrors; 1571 } 1572 break; 1573 case CODE_REJ: 1574 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1575 log(LOG_INFO, 1576 "%s: %s: ignoring RXJ (%s) for code ?, " 1577 "danger will robinson\n", 1578 ifp->if_xname, cp->name, 1579 sppp_cp_type_name(h->type)); 1580 switch (sp->state[cp->protoidx]) { 1581 case STATE_CLOSED: 1582 case STATE_STOPPED: 1583 case STATE_REQ_SENT: 1584 case STATE_ACK_SENT: 1585 case STATE_CLOSING: 1586 case STATE_STOPPING: 1587 case STATE_OPENED: 1588 break; 1589 case STATE_ACK_RCVD: 1590 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1591 break; 1592 default: 1593 printf("%s: %s illegal %s in state %s\n", 1594 ifp->if_xname, cp->name, 1595 sppp_cp_type_name(h->type), 1596 sppp_state_name(sp->state[cp->protoidx])); 1597 ++ifp->if_ierrors; 1598 } 1599 break; 1600 case PROTO_REJ: 1601 { 1602 int catastrophic; 1603 const struct cp *upper; 1604 int i; 1605 uint16_t proto; 1606 1607 catastrophic = 0; 1608 upper = NULL; 1609 proto = p[0] << 8 | p[1]; 1610 for (i = 0; i < IDX_COUNT; i++) { 1611 if (cps[i]->proto == proto) { 1612 upper = cps[i]; 1613 break; 1614 } 1615 } 1616 if (upper == NULL) 1617 catastrophic++; 1618 1619 if (debug) 1620 log(LOG_INFO, 1621 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1622 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1623 sppp_cp_type_name(h->type), proto, 1624 upper ? upper->name : "unknown", 1625 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1626 1627 /* 1628 * if we got RXJ+ against conf-req, the peer does not implement 1629 * this particular protocol type. terminate the protocol. 1630 */ 1631 if (upper && !catastrophic) { 1632 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1633 upper->Close(sp); 1634 break; 1635 } 1636 } 1637 1638 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1639 switch (sp->state[cp->protoidx]) { 1640 case STATE_CLOSED: 1641 case STATE_STOPPED: 1642 case STATE_REQ_SENT: 1643 case STATE_ACK_SENT: 1644 case STATE_CLOSING: 1645 case STATE_STOPPING: 1646 case STATE_OPENED: 1647 break; 1648 case STATE_ACK_RCVD: 1649 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1650 break; 1651 default: 1652 printf("%s: %s illegal %s in state %s\n", 1653 ifp->if_xname, cp->name, 1654 sppp_cp_type_name(h->type), 1655 sppp_state_name(sp->state[cp->protoidx])); 1656 ++ifp->if_ierrors; 1657 } 1658 break; 1659 } 1660 case DISC_REQ: 1661 if (cp->proto != PPP_LCP) 1662 goto illegal; 1663 /* Discard the packet. */ 1664 break; 1665 case ECHO_REQ: 1666 if (cp->proto != PPP_LCP) 1667 goto illegal; 1668 if (sp->state[cp->protoidx] != STATE_OPENED) { 1669 if (debug) 1670 addlog("%s: lcp echo req but lcp closed\n", 1671 ifp->if_xname); 1672 ++ifp->if_ierrors; 1673 break; 1674 } 1675 if (len < 8) { 1676 if (debug) 1677 addlog("%s: invalid lcp echo request " 1678 "packet length: %d bytes\n", 1679 ifp->if_xname, len); 1680 break; 1681 } 1682 memcpy(&u32, h + 1, sizeof u32); 1683 if (ntohl(u32) == sp->lcp.magic) { 1684 /* Line loopback mode detected. */ 1685 printf("%s: loopback\n", ifp->if_xname); 1686 if_down(ifp); 1687 IF_PURGE(&sp->pp_cpq); 1688 1689 /* Shut down the PPP link. */ 1690 /* XXX */ 1691 lcp.Down(sp); 1692 lcp.Up(sp); 1693 break; 1694 } 1695 u32 = htonl(sp->lcp.magic); 1696 memcpy(h + 1, &u32, sizeof u32); 1697 if (debug) 1698 addlog("%s: got lcp echo req, sending echo rep\n", 1699 ifp->if_xname); 1700 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1701 h + 1); 1702 break; 1703 case ECHO_REPLY: 1704 if (cp->proto != PPP_LCP) 1705 goto illegal; 1706 if (h->ident != sp->lcp.echoid) { 1707 ++ifp->if_ierrors; 1708 break; 1709 } 1710 if (len < 8) { 1711 if (debug) 1712 addlog("%s: lcp invalid echo reply " 1713 "packet length: %d bytes\n", 1714 ifp->if_xname, len); 1715 break; 1716 } 1717 if (debug) 1718 addlog("%s: lcp got echo rep\n", 1719 ifp->if_xname); 1720 memcpy(&u32, h + 1, sizeof u32); 1721 if (ntohl(u32) != sp->lcp.magic) 1722 sp->pp_alivecnt = 0; 1723 break; 1724 default: 1725 /* Unknown packet type -- send Code-Reject packet. */ 1726 illegal: 1727 if (debug) 1728 addlog("%s: %s send code-rej for 0x%x\n", 1729 ifp->if_xname, cp->name, h->type); 1730 sppp_cp_send(sp, cp->proto, CODE_REJ, 1731 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1732 ++ifp->if_ierrors; 1733 } 1734 } 1735 1736 1737 /* 1738 * The generic part of all Up/Down/Open/Close/TO event handlers. 1739 * Basically, the state transition handling in the automaton. 1740 */ 1741 static void 1742 sppp_up_event(const struct cp *cp, struct sppp *sp) 1743 { 1744 STDDCL; 1745 1746 if (debug) 1747 log(LOG_DEBUG, "%s: %s up(%s)\n", 1748 ifp->if_xname, cp->name, 1749 sppp_state_name(sp->state[cp->protoidx])); 1750 1751 switch (sp->state[cp->protoidx]) { 1752 case STATE_INITIAL: 1753 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1754 break; 1755 case STATE_STARTING: 1756 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1757 (cp->scr)(sp); 1758 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1759 break; 1760 default: 1761 printf("%s: %s illegal up in state %s\n", 1762 ifp->if_xname, cp->name, 1763 sppp_state_name(sp->state[cp->protoidx])); 1764 } 1765 } 1766 1767 static void 1768 sppp_down_event(const struct cp *cp, struct sppp *sp) 1769 { 1770 STDDCL; 1771 1772 if (debug) 1773 log(LOG_DEBUG, "%s: %s down(%s)\n", 1774 ifp->if_xname, cp->name, 1775 sppp_state_name(sp->state[cp->protoidx])); 1776 1777 switch (sp->state[cp->protoidx]) { 1778 case STATE_CLOSED: 1779 case STATE_CLOSING: 1780 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1781 break; 1782 case STATE_STOPPED: 1783 (cp->tls)(sp); 1784 /* fall through */ 1785 case STATE_STOPPING: 1786 case STATE_REQ_SENT: 1787 case STATE_ACK_RCVD: 1788 case STATE_ACK_SENT: 1789 sppp_cp_change_state(cp, sp, STATE_STARTING); 1790 break; 1791 case STATE_OPENED: 1792 (cp->tld)(sp); 1793 sppp_cp_change_state(cp, sp, STATE_STARTING); 1794 break; 1795 default: 1796 printf("%s: %s illegal down in state %s\n", 1797 ifp->if_xname, cp->name, 1798 sppp_state_name(sp->state[cp->protoidx])); 1799 } 1800 } 1801 1802 1803 static void 1804 sppp_open_event(const struct cp *cp, struct sppp *sp) 1805 { 1806 STDDCL; 1807 1808 if (debug) 1809 log(LOG_DEBUG, "%s: %s open(%s)\n", 1810 ifp->if_xname, cp->name, 1811 sppp_state_name(sp->state[cp->protoidx])); 1812 1813 switch (sp->state[cp->protoidx]) { 1814 case STATE_INITIAL: 1815 sppp_cp_change_state(cp, sp, STATE_STARTING); 1816 (cp->tls)(sp); 1817 break; 1818 case STATE_STARTING: 1819 break; 1820 case STATE_CLOSED: 1821 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1822 (cp->scr)(sp); 1823 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1824 break; 1825 case STATE_STOPPED: 1826 case STATE_STOPPING: 1827 case STATE_REQ_SENT: 1828 case STATE_ACK_RCVD: 1829 case STATE_ACK_SENT: 1830 case STATE_OPENED: 1831 break; 1832 case STATE_CLOSING: 1833 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1834 break; 1835 } 1836 } 1837 1838 1839 static void 1840 sppp_close_event(const struct cp *cp, struct sppp *sp) 1841 { 1842 STDDCL; 1843 1844 if (debug) 1845 log(LOG_DEBUG, "%s: %s close(%s)\n", 1846 ifp->if_xname, cp->name, 1847 sppp_state_name(sp->state[cp->protoidx])); 1848 1849 switch (sp->state[cp->protoidx]) { 1850 case STATE_INITIAL: 1851 case STATE_CLOSED: 1852 case STATE_CLOSING: 1853 break; 1854 case STATE_STARTING: 1855 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1856 (cp->tlf)(sp); 1857 break; 1858 case STATE_STOPPED: 1859 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1860 break; 1861 case STATE_STOPPING: 1862 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1863 break; 1864 case STATE_OPENED: 1865 (cp->tld)(sp); 1866 /* fall through */ 1867 case STATE_REQ_SENT: 1868 case STATE_ACK_RCVD: 1869 case STATE_ACK_SENT: 1870 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1871 sppp_cp_send(sp, cp->proto, TERM_REQ, 1872 ++sp->pp_seq[cp->protoidx], 0, 0); 1873 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1874 break; 1875 } 1876 } 1877 1878 static void 1879 sppp_to_event(const struct cp *cp, struct sppp *sp) 1880 { 1881 STDDCL; 1882 int s; 1883 1884 s = splnet(); 1885 if (debug) 1886 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1887 ifp->if_xname, cp->name, 1888 sppp_state_name(sp->state[cp->protoidx]), 1889 sp->rst_counter[cp->protoidx]); 1890 1891 if (--sp->rst_counter[cp->protoidx] < 0) 1892 /* TO- event */ 1893 switch (sp->state[cp->protoidx]) { 1894 case STATE_CLOSING: 1895 (cp->tlf)(sp); 1896 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1897 sppp_lcp_check_and_close(sp); 1898 break; 1899 case STATE_STOPPING: 1900 (cp->tlf)(sp); 1901 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1902 sppp_lcp_check_and_close(sp); 1903 break; 1904 case STATE_REQ_SENT: 1905 case STATE_ACK_RCVD: 1906 case STATE_ACK_SENT: 1907 (cp->tlf)(sp); 1908 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1909 sppp_lcp_check_and_close(sp); 1910 break; 1911 } 1912 else 1913 /* TO+ event */ 1914 switch (sp->state[cp->protoidx]) { 1915 case STATE_CLOSING: 1916 case STATE_STOPPING: 1917 sppp_cp_send(sp, cp->proto, TERM_REQ, 1918 ++sp->pp_seq[cp->protoidx], 0, 0); 1919 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1920 cp->TO, sp); 1921 break; 1922 case STATE_REQ_SENT: 1923 case STATE_ACK_RCVD: 1924 (cp->scr)(sp); 1925 /* sppp_cp_change_state() will restart the timer */ 1926 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1927 break; 1928 case STATE_ACK_SENT: 1929 (cp->scr)(sp); 1930 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1931 cp->TO, sp); 1932 break; 1933 } 1934 1935 splx(s); 1936 } 1937 1938 /* 1939 * Change the state of a control protocol in the state automaton. 1940 * Takes care of starting/stopping the restart timer. 1941 */ 1942 void 1943 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1944 { 1945 sp->state[cp->protoidx] = newstate; 1946 callout_stop(&sp->ch[cp->protoidx]); 1947 switch (newstate) { 1948 case STATE_INITIAL: 1949 case STATE_STARTING: 1950 case STATE_CLOSED: 1951 case STATE_STOPPED: 1952 case STATE_OPENED: 1953 break; 1954 case STATE_CLOSING: 1955 case STATE_STOPPING: 1956 case STATE_REQ_SENT: 1957 case STATE_ACK_RCVD: 1958 case STATE_ACK_SENT: 1959 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1960 cp->TO, sp); 1961 break; 1962 } 1963 } 1964 1965 /* 1966 *--------------------------------------------------------------------------* 1967 * * 1968 * The LCP implementation. * 1969 * * 1970 *--------------------------------------------------------------------------* 1971 */ 1972 static void 1973 sppp_lcp_init(struct sppp *sp) 1974 { 1975 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1976 sp->lcp.magic = 0; 1977 sp->state[IDX_LCP] = STATE_INITIAL; 1978 sp->fail_counter[IDX_LCP] = 0; 1979 sp->pp_seq[IDX_LCP] = 0; 1980 sp->pp_rseq[IDX_LCP] = 0; 1981 sp->lcp.protos = 0; 1982 1983 /* 1984 * Initialize counters and timeout values. Note that we don't 1985 * use the 3 seconds suggested in RFC 1661 since we are likely 1986 * running on a fast link. XXX We should probably implement 1987 * the exponential backoff option. Note that these values are 1988 * relevant for all control protocols, not just LCP only. 1989 */ 1990 sp->lcp.timeout = 1 * hz; 1991 sp->lcp.max_terminate = 2; 1992 sp->lcp.max_configure = 10; 1993 sp->lcp.max_failure = 10; 1994 callout_init(&sp->ch[IDX_LCP], 0); 1995 } 1996 1997 static void 1998 sppp_lcp_up(struct sppp *sp) 1999 { 2000 STDDCL; 2001 2002 /* Initialize activity timestamp: opening a connection is an activity */ 2003 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2004 2005 /* 2006 * If this interface is passive or dial-on-demand, and we are 2007 * still in Initial state, it means we've got an incoming 2008 * call. Activate the interface. 2009 */ 2010 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2011 if (debug) 2012 log(LOG_DEBUG, 2013 "%s: Up event", ifp->if_xname); 2014 ifp->if_flags |= IFF_RUNNING; 2015 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2016 if (debug) 2017 addlog("(incoming call)\n"); 2018 sp->pp_flags |= PP_CALLIN; 2019 lcp.Open(sp); 2020 } else if (debug) 2021 addlog("\n"); 2022 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2023 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2024 ifp->if_flags |= IFF_RUNNING; 2025 lcp.Open(sp); 2026 } 2027 2028 sppp_up_event(&lcp, sp); 2029 } 2030 2031 static void 2032 sppp_lcp_down(struct sppp *sp) 2033 { 2034 STDDCL; 2035 2036 sppp_down_event(&lcp, sp); 2037 2038 /* 2039 * If this is neither a dial-on-demand nor a passive 2040 * interface, simulate an ``ifconfig down'' action, so the 2041 * administrator can force a redial by another ``ifconfig 2042 * up''. XXX For leased line operation, should we immediately 2043 * try to reopen the connection here? 2044 */ 2045 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2046 if (debug) 2047 log(LOG_INFO, 2048 "%s: Down event (carrier loss), taking interface down.\n", 2049 ifp->if_xname); 2050 if_down(ifp); 2051 } else { 2052 if (debug) 2053 log(LOG_DEBUG, 2054 "%s: Down event (carrier loss)\n", 2055 ifp->if_xname); 2056 } 2057 sp->pp_flags &= ~PP_CALLIN; 2058 if (sp->state[IDX_LCP] != STATE_INITIAL) 2059 lcp.Close(sp); 2060 ifp->if_flags &= ~IFF_RUNNING; 2061 } 2062 2063 static void 2064 sppp_lcp_open(struct sppp *sp) 2065 { 2066 if (sp->pp_if.if_mtu < PP_MTU) { 2067 sp->lcp.mru = sp->pp_if.if_mtu; 2068 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2069 } else 2070 sp->lcp.mru = PP_MTU; 2071 sp->lcp.their_mru = PP_MTU; 2072 2073 /* 2074 * If we are authenticator, negotiate LCP_AUTH 2075 */ 2076 if (sp->hisauth.proto != 0) 2077 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2078 else 2079 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2080 sp->pp_flags &= ~PP_NEEDAUTH; 2081 sppp_open_event(&lcp, sp); 2082 } 2083 2084 static void 2085 sppp_lcp_close(struct sppp *sp) 2086 { 2087 sppp_close_event(&lcp, sp); 2088 } 2089 2090 static void 2091 sppp_lcp_TO(void *cookie) 2092 { 2093 sppp_to_event(&lcp, (struct sppp *)cookie); 2094 } 2095 2096 /* 2097 * Analyze a configure request. Return true if it was agreeable, and 2098 * caused action sca, false if it has been rejected or nak'ed, and 2099 * caused action scn. (The return value is used to make the state 2100 * transition decision in the state automaton.) 2101 */ 2102 static int 2103 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2104 { 2105 STDDCL; 2106 u_char *buf, *r, *p; 2107 int origlen, rlen; 2108 uint32_t nmagic; 2109 u_short authproto; 2110 2111 len -= 4; 2112 origlen = len; 2113 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2114 if (! buf) 2115 return (0); 2116 2117 if (debug) 2118 log(LOG_DEBUG, "%s: lcp parse opts:", 2119 ifp->if_xname); 2120 2121 /* pass 1: check for things that need to be rejected */ 2122 p = (void *)(h + 1); 2123 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2124 /* Sanity check option length */ 2125 if (p[1] > len) { 2126 /* 2127 * Malicious option - drop immediately. 2128 * XXX Maybe we should just RXJ it? 2129 */ 2130 addlog("%s: received malicious LCP option 0x%02x, " 2131 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2132 p[0], p[1], len); 2133 goto drop; 2134 } 2135 if (debug) 2136 addlog(" %s", sppp_lcp_opt_name(*p)); 2137 switch (*p) { 2138 case LCP_OPT_MAGIC: 2139 /* Magic number. */ 2140 /* fall through, both are same length */ 2141 case LCP_OPT_ASYNC_MAP: 2142 /* Async control character map. */ 2143 if (len >= 6 || p[1] == 6) 2144 continue; 2145 if (debug) 2146 addlog(" [invalid]"); 2147 break; 2148 case LCP_OPT_MRU: 2149 /* Maximum receive unit. */ 2150 if (len >= 4 && p[1] == 4) 2151 continue; 2152 if (debug) 2153 addlog(" [invalid]"); 2154 break; 2155 case LCP_OPT_AUTH_PROTO: 2156 if (len < 4) { 2157 if (debug) 2158 addlog(" [invalid]"); 2159 break; 2160 } 2161 authproto = (p[2] << 8) + p[3]; 2162 if (authproto == PPP_CHAP && p[1] != 5) { 2163 if (debug) 2164 addlog(" [invalid chap len]"); 2165 break; 2166 } 2167 if (sp->myauth.proto == 0) { 2168 /* we are not configured to do auth */ 2169 if (debug) 2170 addlog(" [not configured]"); 2171 break; 2172 } 2173 /* 2174 * Remote want us to authenticate, remember this, 2175 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2176 * up. 2177 */ 2178 sp->pp_flags |= PP_NEEDAUTH; 2179 continue; 2180 default: 2181 /* Others not supported. */ 2182 if (debug) 2183 addlog(" [rej]"); 2184 break; 2185 } 2186 /* Add the option to rejected list. */ 2187 bcopy (p, r, p[1]); 2188 r += p[1]; 2189 rlen += p[1]; 2190 } 2191 if (rlen) { 2192 if (debug) 2193 addlog(" send conf-rej\n"); 2194 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2195 goto end; 2196 } else if (debug) 2197 addlog("\n"); 2198 2199 /* 2200 * pass 2: check for option values that are unacceptable and 2201 * thus require to be nak'ed. 2202 */ 2203 if (debug) 2204 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2205 ifp->if_xname); 2206 2207 p = (void *)(h + 1); 2208 len = origlen; 2209 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2210 if (debug) 2211 addlog(" %s", sppp_lcp_opt_name(*p)); 2212 switch (*p) { 2213 case LCP_OPT_MAGIC: 2214 /* Magic number -- extract. */ 2215 nmagic = (uint32_t)p[2] << 24 | 2216 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2217 if (nmagic != sp->lcp.magic) { 2218 if (debug) 2219 addlog(" 0x%x", nmagic); 2220 continue; 2221 } 2222 /* 2223 * Local and remote magics equal -- loopback? 2224 */ 2225 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2226 printf ("%s: loopback\n", 2227 ifp->if_xname); 2228 sp->pp_loopcnt = 0; 2229 if (ifp->if_flags & IFF_UP) { 2230 if_down(ifp); 2231 IF_PURGE(&sp->pp_cpq); 2232 /* XXX ? */ 2233 lcp.Down(sp); 2234 lcp.Up(sp); 2235 } 2236 } else if (debug) 2237 addlog(" [glitch]"); 2238 ++sp->pp_loopcnt; 2239 /* 2240 * We negate our magic here, and NAK it. If 2241 * we see it later in an NAK packet, we 2242 * suggest a new one. 2243 */ 2244 nmagic = ~sp->lcp.magic; 2245 /* Gonna NAK it. */ 2246 p[2] = nmagic >> 24; 2247 p[3] = nmagic >> 16; 2248 p[4] = nmagic >> 8; 2249 p[5] = nmagic; 2250 break; 2251 2252 case LCP_OPT_ASYNC_MAP: 2253 /* 2254 * Async control character map -- just ignore it. 2255 * 2256 * Quote from RFC 1662, chapter 6: 2257 * To enable this functionality, synchronous PPP 2258 * implementations MUST always respond to the 2259 * Async-Control-Character-Map Configuration 2260 * Option with the LCP Configure-Ack. However, 2261 * acceptance of the Configuration Option does 2262 * not imply that the synchronous implementation 2263 * will do any ACCM mapping. Instead, all such 2264 * octet mapping will be performed by the 2265 * asynchronous-to-synchronous converter. 2266 */ 2267 continue; 2268 2269 case LCP_OPT_MRU: 2270 /* 2271 * Maximum receive unit. Always agreeable, 2272 * but ignored by now. 2273 */ 2274 sp->lcp.their_mru = p[2] * 256 + p[3]; 2275 if (debug) 2276 addlog(" %ld", sp->lcp.their_mru); 2277 continue; 2278 2279 case LCP_OPT_AUTH_PROTO: 2280 authproto = (p[2] << 8) + p[3]; 2281 if (sp->myauth.proto != authproto) { 2282 /* not agreed, nak */ 2283 if (debug) 2284 addlog(" [mine %s != his %s]", 2285 sppp_proto_name(sp->myauth.proto), 2286 sppp_proto_name(authproto)); 2287 p[2] = sp->myauth.proto >> 8; 2288 p[3] = sp->myauth.proto; 2289 break; 2290 } 2291 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2292 if (debug) 2293 addlog(" [chap not MD5]"); 2294 p[4] = CHAP_MD5; 2295 break; 2296 } 2297 continue; 2298 } 2299 /* Add the option to nak'ed list. */ 2300 bcopy (p, r, p[1]); 2301 r += p[1]; 2302 rlen += p[1]; 2303 } 2304 if (rlen) { 2305 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2306 if (debug) 2307 addlog(" max_failure (%d) exceeded, " 2308 "send conf-rej\n", 2309 sp->lcp.max_failure); 2310 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2311 } else { 2312 if (debug) 2313 addlog(" send conf-nak\n"); 2314 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2315 } 2316 goto end; 2317 } else { 2318 if (debug) 2319 addlog(" send conf-ack\n"); 2320 sp->fail_counter[IDX_LCP] = 0; 2321 sp->pp_loopcnt = 0; 2322 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2323 } 2324 2325 end: 2326 free(buf, M_TEMP); 2327 return (rlen == 0); 2328 2329 drop: 2330 free(buf, M_TEMP); 2331 return -1; 2332 } 2333 2334 /* 2335 * Analyze the LCP Configure-Reject option list, and adjust our 2336 * negotiation. 2337 */ 2338 static void 2339 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2340 { 2341 STDDCL; 2342 u_char *buf, *p; 2343 2344 len -= 4; 2345 buf = malloc (len, M_TEMP, M_NOWAIT); 2346 if (!buf) 2347 return; 2348 2349 if (debug) 2350 log(LOG_DEBUG, "%s: lcp rej opts:", 2351 ifp->if_xname); 2352 2353 p = (void *)(h + 1); 2354 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2355 /* Sanity check option length */ 2356 if (p[1] > len) { 2357 /* 2358 * Malicious option - drop immediately. 2359 * XXX Maybe we should just RXJ it? 2360 */ 2361 addlog("%s: received malicious LCP option, " 2362 "dropping.\n", ifp->if_xname); 2363 goto drop; 2364 } 2365 if (debug) 2366 addlog(" %s", sppp_lcp_opt_name(*p)); 2367 switch (*p) { 2368 case LCP_OPT_MAGIC: 2369 /* Magic number -- can't use it, use 0 */ 2370 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2371 sp->lcp.magic = 0; 2372 break; 2373 case LCP_OPT_MRU: 2374 /* 2375 * We try to negotiate a lower MRU if the underlying 2376 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2377 * peer rejects this lower rate, fallback to the 2378 * default. 2379 */ 2380 if (debug) { 2381 addlog("%s: warning: peer rejected our MRU of " 2382 "%ld bytes. Defaulting to %d bytes\n", 2383 ifp->if_xname, sp->lcp.mru, PP_MTU); 2384 } 2385 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2386 sp->lcp.mru = PP_MTU; 2387 break; 2388 case LCP_OPT_AUTH_PROTO: 2389 /* 2390 * Peer doesn't want to authenticate himself, 2391 * deny unless this is a dialout call, and 2392 * SPPP_AUTHFLAG_NOCALLOUT is set. 2393 */ 2394 if ((sp->pp_flags & PP_CALLIN) == 0 && 2395 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2396 if (debug) 2397 addlog(" [don't insist on auth " 2398 "for callout]"); 2399 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2400 break; 2401 } 2402 if (debug) 2403 addlog("[access denied]\n"); 2404 lcp.Close(sp); 2405 break; 2406 } 2407 } 2408 if (debug) 2409 addlog("\n"); 2410 drop: 2411 free(buf, M_TEMP); 2412 return; 2413 } 2414 2415 /* 2416 * Analyze the LCP Configure-NAK option list, and adjust our 2417 * negotiation. 2418 */ 2419 static void 2420 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2421 { 2422 STDDCL; 2423 u_char *buf, *p; 2424 uint32_t magic; 2425 2426 len -= 4; 2427 buf = malloc (len, M_TEMP, M_NOWAIT); 2428 if (!buf) 2429 return; 2430 2431 if (debug) 2432 log(LOG_DEBUG, "%s: lcp nak opts:", 2433 ifp->if_xname); 2434 2435 p = (void *)(h + 1); 2436 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2437 /* Sanity check option length */ 2438 if (p[1] > len) { 2439 /* 2440 * Malicious option - drop immediately. 2441 * XXX Maybe we should just RXJ it? 2442 */ 2443 addlog("%s: received malicious LCP option, " 2444 "dropping.\n", ifp->if_xname); 2445 goto drop; 2446 } 2447 if (debug) 2448 addlog(" %s", sppp_lcp_opt_name(*p)); 2449 switch (*p) { 2450 case LCP_OPT_MAGIC: 2451 /* Magic number -- renegotiate */ 2452 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2453 len >= 6 && p[1] == 6) { 2454 magic = (uint32_t)p[2] << 24 | 2455 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2456 /* 2457 * If the remote magic is our negated one, 2458 * this looks like a loopback problem. 2459 * Suggest a new magic to make sure. 2460 */ 2461 if (magic == ~sp->lcp.magic) { 2462 if (debug) 2463 addlog(" magic glitch"); 2464 sp->lcp.magic = cprng_fast32(); 2465 } else { 2466 sp->lcp.magic = magic; 2467 if (debug) 2468 addlog(" %d", magic); 2469 } 2470 } 2471 break; 2472 case LCP_OPT_MRU: 2473 /* 2474 * Peer wants to advise us to negotiate an MRU. 2475 * Agree on it if it's reasonable, or use 2476 * default otherwise. 2477 */ 2478 if (len >= 4 && p[1] == 4) { 2479 u_int mru = p[2] * 256 + p[3]; 2480 if (debug) 2481 addlog(" %d", mru); 2482 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2483 mru = sp->pp_if.if_mtu; 2484 sp->lcp.mru = mru; 2485 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2486 } 2487 break; 2488 case LCP_OPT_AUTH_PROTO: 2489 /* 2490 * Peer doesn't like our authentication method, 2491 * deny. 2492 */ 2493 if (debug) 2494 addlog("[access denied]\n"); 2495 lcp.Close(sp); 2496 break; 2497 } 2498 } 2499 if (debug) 2500 addlog("\n"); 2501 drop: 2502 free(buf, M_TEMP); 2503 return; 2504 } 2505 2506 static void 2507 sppp_lcp_tlu(struct sppp *sp) 2508 { 2509 STDDCL; 2510 int i; 2511 uint32_t mask; 2512 2513 /* XXX ? */ 2514 if (! (ifp->if_flags & IFF_UP) && 2515 (ifp->if_flags & IFF_RUNNING)) { 2516 /* Coming out of loopback mode. */ 2517 if_up(ifp); 2518 } 2519 2520 for (i = 0; i < IDX_COUNT; i++) 2521 if ((cps[i])->flags & CP_QUAL) 2522 (cps[i])->Open(sp); 2523 2524 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2525 (sp->pp_flags & PP_NEEDAUTH) != 0) 2526 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2527 else 2528 sp->pp_phase = SPPP_PHASE_NETWORK; 2529 2530 if (debug) 2531 { 2532 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2533 sppp_phase_name(sp->pp_phase)); 2534 } 2535 2536 /* 2537 * Open all authentication protocols. This is even required 2538 * if we already proceeded to network phase, since it might be 2539 * that remote wants us to authenticate, so we might have to 2540 * send a PAP request. Undesired authentication protocols 2541 * don't do anything when they get an Open event. 2542 */ 2543 for (i = 0; i < IDX_COUNT; i++) 2544 if ((cps[i])->flags & CP_AUTH) 2545 (cps[i])->Open(sp); 2546 2547 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2548 /* Notify all NCPs. */ 2549 for (i = 0; i < IDX_COUNT; i++) 2550 if ((cps[i])->flags & CP_NCP) 2551 (cps[i])->Open(sp); 2552 } 2553 2554 /* Send Up events to all started protos. */ 2555 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2556 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2557 (cps[i])->Up(sp); 2558 2559 /* notify low-level driver of state change */ 2560 if (sp->pp_chg) 2561 sp->pp_chg(sp, (int)sp->pp_phase); 2562 2563 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2564 /* if no NCP is starting, close down */ 2565 sppp_lcp_check_and_close(sp); 2566 } 2567 2568 static void 2569 sppp_lcp_tld(struct sppp *sp) 2570 { 2571 STDDCL; 2572 int i; 2573 uint32_t mask; 2574 2575 sp->pp_phase = SPPP_PHASE_TERMINATE; 2576 2577 if (debug) 2578 { 2579 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2580 sppp_phase_name(sp->pp_phase)); 2581 } 2582 2583 /* 2584 * Take upper layers down. We send the Down event first and 2585 * the Close second to prevent the upper layers from sending 2586 * ``a flurry of terminate-request packets'', as the RFC 2587 * describes it. 2588 */ 2589 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2590 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2591 (cps[i])->Down(sp); 2592 (cps[i])->Close(sp); 2593 } 2594 } 2595 2596 static void 2597 sppp_lcp_tls(struct sppp *sp) 2598 { 2599 STDDCL; 2600 2601 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2602 printf("%s: authentication failed %d times, not retrying again\n", 2603 sp->pp_if.if_xname, sp->pp_auth_failures); 2604 if_down(&sp->pp_if); 2605 return; 2606 } 2607 2608 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2609 2610 if (debug) 2611 { 2612 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2613 sppp_phase_name(sp->pp_phase)); 2614 } 2615 2616 /* Notify lower layer if desired. */ 2617 if (sp->pp_tls) 2618 (sp->pp_tls)(sp); 2619 } 2620 2621 static void 2622 sppp_lcp_tlf(struct sppp *sp) 2623 { 2624 STDDCL; 2625 2626 sp->pp_phase = SPPP_PHASE_DEAD; 2627 2628 if (debug) 2629 { 2630 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2631 sppp_phase_name(sp->pp_phase)); 2632 } 2633 2634 /* Notify lower layer if desired. */ 2635 if (sp->pp_tlf) 2636 (sp->pp_tlf)(sp); 2637 } 2638 2639 static void 2640 sppp_lcp_scr(struct sppp *sp) 2641 { 2642 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2643 int i = 0; 2644 u_short authproto; 2645 2646 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2647 if (! sp->lcp.magic) 2648 sp->lcp.magic = cprng_fast32(); 2649 opt[i++] = LCP_OPT_MAGIC; 2650 opt[i++] = 6; 2651 opt[i++] = sp->lcp.magic >> 24; 2652 opt[i++] = sp->lcp.magic >> 16; 2653 opt[i++] = sp->lcp.magic >> 8; 2654 opt[i++] = sp->lcp.magic; 2655 } 2656 2657 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2658 opt[i++] = LCP_OPT_MRU; 2659 opt[i++] = 4; 2660 opt[i++] = sp->lcp.mru >> 8; 2661 opt[i++] = sp->lcp.mru; 2662 } 2663 2664 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2665 authproto = sp->hisauth.proto; 2666 opt[i++] = LCP_OPT_AUTH_PROTO; 2667 opt[i++] = authproto == PPP_CHAP? 5: 4; 2668 opt[i++] = authproto >> 8; 2669 opt[i++] = authproto; 2670 if (authproto == PPP_CHAP) 2671 opt[i++] = CHAP_MD5; 2672 } 2673 2674 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2675 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2676 } 2677 2678 /* 2679 * Check the open NCPs, return true if at least one NCP is open. 2680 */ 2681 static int 2682 sppp_ncp_check(struct sppp *sp) 2683 { 2684 int i, mask; 2685 2686 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2687 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2688 return 1; 2689 return 0; 2690 } 2691 2692 /* 2693 * Re-check the open NCPs and see if we should terminate the link. 2694 * Called by the NCPs during their tlf action handling. 2695 */ 2696 static void 2697 sppp_lcp_check_and_close(struct sppp *sp) 2698 { 2699 2700 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2701 /* don't bother, we are already going down */ 2702 return; 2703 2704 if (sppp_ncp_check(sp)) 2705 return; 2706 2707 lcp.Close(sp); 2708 } 2709 2710 2711 /* 2712 *--------------------------------------------------------------------------* 2713 * * 2714 * The IPCP implementation. * 2715 * * 2716 *--------------------------------------------------------------------------* 2717 */ 2718 2719 static void 2720 sppp_ipcp_init(struct sppp *sp) 2721 { 2722 sp->ipcp.opts = 0; 2723 sp->ipcp.flags = 0; 2724 sp->state[IDX_IPCP] = STATE_INITIAL; 2725 sp->fail_counter[IDX_IPCP] = 0; 2726 sp->pp_seq[IDX_IPCP] = 0; 2727 sp->pp_rseq[IDX_IPCP] = 0; 2728 callout_init(&sp->ch[IDX_IPCP], 0); 2729 } 2730 2731 static void 2732 sppp_ipcp_up(struct sppp *sp) 2733 { 2734 sppp_up_event(&ipcp, sp); 2735 } 2736 2737 static void 2738 sppp_ipcp_down(struct sppp *sp) 2739 { 2740 sppp_down_event(&ipcp, sp); 2741 } 2742 2743 static void 2744 sppp_ipcp_open(struct sppp *sp) 2745 { 2746 STDDCL; 2747 uint32_t myaddr, hisaddr; 2748 2749 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2750 sp->ipcp.req_myaddr = 0; 2751 sp->ipcp.req_hisaddr = 0; 2752 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2753 2754 #ifdef INET 2755 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2756 #else 2757 myaddr = hisaddr = 0; 2758 #endif 2759 /* 2760 * If we don't have his address, this probably means our 2761 * interface doesn't want to talk IP at all. (This could 2762 * be the case if somebody wants to speak only IPX, for 2763 * example.) Don't open IPCP in this case. 2764 */ 2765 if (hisaddr == 0) { 2766 /* XXX this message should go away */ 2767 if (debug) 2768 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2769 ifp->if_xname); 2770 return; 2771 } 2772 2773 if (myaddr == 0) { 2774 /* 2775 * I don't have an assigned address, so i need to 2776 * negotiate my address. 2777 */ 2778 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2779 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2780 } 2781 if (hisaddr == 1) { 2782 /* 2783 * XXX - remove this hack! 2784 * remote has no valid address, we need to get one assigned. 2785 */ 2786 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2787 } 2788 sppp_open_event(&ipcp, sp); 2789 } 2790 2791 static void 2792 sppp_ipcp_close(struct sppp *sp) 2793 { 2794 STDDCL; 2795 2796 sppp_close_event(&ipcp, sp); 2797 #ifdef INET 2798 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2799 /* 2800 * Some address was dynamic, clear it again. 2801 */ 2802 sppp_clear_ip_addrs(sp); 2803 #endif 2804 2805 if (sp->pp_saved_mtu > 0) { 2806 ifp->if_mtu = sp->pp_saved_mtu; 2807 sp->pp_saved_mtu = 0; 2808 if (debug) 2809 log(LOG_DEBUG, 2810 "%s: resetting MTU to %" PRIu64 " bytes\n", 2811 ifp->if_xname, ifp->if_mtu); 2812 } 2813 } 2814 2815 static void 2816 sppp_ipcp_TO(void *cookie) 2817 { 2818 sppp_to_event(&ipcp, (struct sppp *)cookie); 2819 } 2820 2821 /* 2822 * Analyze a configure request. Return true if it was agreeable, and 2823 * caused action sca, false if it has been rejected or nak'ed, and 2824 * caused action scn. (The return value is used to make the state 2825 * transition decision in the state automaton.) 2826 */ 2827 static int 2828 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2829 { 2830 u_char *buf, *r, *p; 2831 struct ifnet *ifp = &sp->pp_if; 2832 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2833 uint32_t hisaddr, desiredaddr; 2834 2835 len -= 4; 2836 origlen = len; 2837 /* 2838 * Make sure to allocate a buf that can at least hold a 2839 * conf-nak with an `address' option. We might need it below. 2840 */ 2841 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2842 if (! buf) 2843 return (0); 2844 2845 /* pass 1: see if we can recognize them */ 2846 if (debug) 2847 log(LOG_DEBUG, "%s: ipcp parse opts:", 2848 ifp->if_xname); 2849 p = (void *)(h + 1); 2850 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2851 /* Sanity check option length */ 2852 if (p[1] > len) { 2853 /* XXX should we just RXJ? */ 2854 addlog("%s: malicious IPCP option received, dropping\n", 2855 ifp->if_xname); 2856 goto drop; 2857 } 2858 if (debug) 2859 addlog(" %s", sppp_ipcp_opt_name(*p)); 2860 switch (*p) { 2861 #ifdef notyet 2862 case IPCP_OPT_COMPRESSION: 2863 if (len >= 6 && p[1] >= 6) { 2864 /* correctly formed compress option */ 2865 continue; 2866 } 2867 if (debug) 2868 addlog(" [invalid]"); 2869 break; 2870 #endif 2871 case IPCP_OPT_ADDRESS: 2872 if (len >= 6 && p[1] == 6) { 2873 /* correctly formed address option */ 2874 continue; 2875 } 2876 if (debug) 2877 addlog(" [invalid]"); 2878 break; 2879 default: 2880 /* Others not supported. */ 2881 if (debug) 2882 addlog(" [rej]"); 2883 break; 2884 } 2885 /* Add the option to rejected list. */ 2886 bcopy (p, r, p[1]); 2887 r += p[1]; 2888 rlen += p[1]; 2889 } 2890 if (rlen) { 2891 if (debug) 2892 addlog(" send conf-rej\n"); 2893 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2894 goto end; 2895 } else if (debug) 2896 addlog("\n"); 2897 2898 /* pass 2: parse option values */ 2899 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2900 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2901 else 2902 #ifdef INET 2903 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2904 #else 2905 hisaddr = 0; 2906 #endif 2907 if (debug) 2908 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2909 ifp->if_xname); 2910 p = (void *)(h + 1); 2911 len = origlen; 2912 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2913 if (debug) 2914 addlog(" %s", sppp_ipcp_opt_name(*p)); 2915 switch (*p) { 2916 #ifdef notyet 2917 case IPCP_OPT_COMPRESSION: 2918 continue; 2919 #endif 2920 case IPCP_OPT_ADDRESS: 2921 desiredaddr = p[2] << 24 | p[3] << 16 | 2922 p[4] << 8 | p[5]; 2923 if (desiredaddr == hisaddr || 2924 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2925 /* 2926 * Peer's address is same as our value, 2927 * this is agreeable. Gonna conf-ack 2928 * it. 2929 */ 2930 if (debug) 2931 addlog(" %s [ack]", 2932 sppp_dotted_quad(hisaddr)); 2933 /* record that we've seen it already */ 2934 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2935 sp->ipcp.req_hisaddr = desiredaddr; 2936 hisaddr = desiredaddr; 2937 continue; 2938 } 2939 /* 2940 * The address wasn't agreeable. This is either 2941 * he sent us 0.0.0.0, asking to assign him an 2942 * address, or he send us another address not 2943 * matching our value. Either case, we gonna 2944 * conf-nak it with our value. 2945 */ 2946 if (debug) { 2947 if (desiredaddr == 0) 2948 addlog(" [addr requested]"); 2949 else 2950 addlog(" %s [not agreed]", 2951 sppp_dotted_quad(desiredaddr)); 2952 } 2953 2954 p[2] = hisaddr >> 24; 2955 p[3] = hisaddr >> 16; 2956 p[4] = hisaddr >> 8; 2957 p[5] = hisaddr; 2958 break; 2959 } 2960 /* Add the option to nak'ed list. */ 2961 bcopy (p, r, p[1]); 2962 r += p[1]; 2963 rlen += p[1]; 2964 } 2965 2966 /* 2967 * If we are about to conf-ack the request, but haven't seen 2968 * his address so far, gonna conf-nak it instead, with the 2969 * `address' option present and our idea of his address being 2970 * filled in there, to request negotiation of both addresses. 2971 * 2972 * XXX This can result in an endless req - nak loop if peer 2973 * doesn't want to send us his address. Q: What should we do 2974 * about it? XXX A: implement the max-failure counter. 2975 */ 2976 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2977 buf[0] = IPCP_OPT_ADDRESS; 2978 buf[1] = 6; 2979 buf[2] = hisaddr >> 24; 2980 buf[3] = hisaddr >> 16; 2981 buf[4] = hisaddr >> 8; 2982 buf[5] = hisaddr; 2983 rlen = 6; 2984 if (debug) 2985 addlog(" still need hisaddr"); 2986 } 2987 2988 if (rlen) { 2989 if (debug) 2990 addlog(" send conf-nak\n"); 2991 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2992 } else { 2993 if (debug) 2994 addlog(" send conf-ack\n"); 2995 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2996 } 2997 2998 end: 2999 free(buf, M_TEMP); 3000 return (rlen == 0); 3001 3002 drop: 3003 free(buf, M_TEMP); 3004 return -1; 3005 } 3006 3007 /* 3008 * Analyze the IPCP Configure-Reject option list, and adjust our 3009 * negotiation. 3010 */ 3011 static void 3012 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3013 { 3014 u_char *buf, *p; 3015 struct ifnet *ifp = &sp->pp_if; 3016 int debug = ifp->if_flags & IFF_DEBUG; 3017 3018 len -= 4; 3019 buf = malloc (len, M_TEMP, M_NOWAIT); 3020 if (!buf) 3021 return; 3022 3023 if (debug) 3024 log(LOG_DEBUG, "%s: ipcp rej opts:", 3025 ifp->if_xname); 3026 3027 p = (void *)(h + 1); 3028 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3029 /* Sanity check option length */ 3030 if (p[1] > len) { 3031 /* XXX should we just RXJ? */ 3032 addlog("%s: malicious IPCP option received, dropping\n", 3033 ifp->if_xname); 3034 goto drop; 3035 } 3036 if (debug) 3037 addlog(" %s", sppp_ipcp_opt_name(*p)); 3038 switch (*p) { 3039 case IPCP_OPT_ADDRESS: 3040 /* 3041 * Peer doesn't grok address option. This is 3042 * bad. XXX Should we better give up here? 3043 */ 3044 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3045 break; 3046 #ifdef notyet 3047 case IPCP_OPT_COMPRESS: 3048 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3049 break; 3050 #endif 3051 } 3052 } 3053 if (debug) 3054 addlog("\n"); 3055 drop: 3056 free(buf, M_TEMP); 3057 return; 3058 } 3059 3060 /* 3061 * Analyze the IPCP Configure-NAK option list, and adjust our 3062 * negotiation. 3063 */ 3064 static void 3065 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3066 { 3067 u_char *p; 3068 struct ifnet *ifp = &sp->pp_if; 3069 int debug = ifp->if_flags & IFF_DEBUG; 3070 uint32_t wantaddr; 3071 3072 len -= 4; 3073 3074 if (debug) 3075 log(LOG_DEBUG, "%s: ipcp nak opts:", 3076 ifp->if_xname); 3077 3078 p = (void *)(h + 1); 3079 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3080 /* Sanity check option length */ 3081 if (p[1] > len) { 3082 /* XXX should we just RXJ? */ 3083 addlog("%s: malicious IPCP option received, dropping\n", 3084 ifp->if_xname); 3085 return; 3086 } 3087 if (debug) 3088 addlog(" %s", sppp_ipcp_opt_name(*p)); 3089 switch (*p) { 3090 case IPCP_OPT_ADDRESS: 3091 /* 3092 * Peer doesn't like our local IP address. See 3093 * if we can do something for him. We'll drop 3094 * him our address then. 3095 */ 3096 if (len >= 6 && p[1] == 6) { 3097 wantaddr = p[2] << 24 | p[3] << 16 | 3098 p[4] << 8 | p[5]; 3099 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3100 if (debug) 3101 addlog(" [wantaddr %s]", 3102 sppp_dotted_quad(wantaddr)); 3103 /* 3104 * When doing dynamic address assignment, 3105 * we accept his offer. Otherwise, we 3106 * ignore it and thus continue to negotiate 3107 * our already existing value. 3108 */ 3109 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3110 if (debug) 3111 addlog(" [agree]"); 3112 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3113 sp->ipcp.req_myaddr = wantaddr; 3114 } 3115 } 3116 break; 3117 3118 case IPCP_OPT_PRIMDNS: 3119 if (len >= 6 && p[1] == 6) { 3120 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3121 p[4] << 8 | p[5]; 3122 } 3123 break; 3124 3125 case IPCP_OPT_SECDNS: 3126 if (len >= 6 && p[1] == 6) { 3127 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3128 p[4] << 8 | p[5]; 3129 } 3130 break; 3131 #ifdef notyet 3132 case IPCP_OPT_COMPRESS: 3133 /* 3134 * Peer wants different compression parameters. 3135 */ 3136 break; 3137 #endif 3138 } 3139 } 3140 if (debug) 3141 addlog("\n"); 3142 } 3143 3144 static void 3145 sppp_ipcp_tlu(struct sppp *sp) 3146 { 3147 #ifdef INET 3148 /* we are up. Set addresses and notify anyone interested */ 3149 STDDCL; 3150 uint32_t myaddr, hisaddr; 3151 3152 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3153 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3154 myaddr = sp->ipcp.req_myaddr; 3155 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3156 hisaddr = sp->ipcp.req_hisaddr; 3157 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3158 3159 if (ifp->if_mtu > sp->lcp.their_mru) { 3160 sp->pp_saved_mtu = ifp->if_mtu; 3161 ifp->if_mtu = sp->lcp.their_mru; 3162 if (debug) 3163 log(LOG_DEBUG, 3164 "%s: setting MTU to %" PRIu64 " bytes\n", 3165 ifp->if_xname, ifp->if_mtu); 3166 } 3167 3168 if (sp->pp_con) 3169 sp->pp_con(sp); 3170 #endif 3171 } 3172 3173 static void 3174 sppp_ipcp_tld(struct sppp *sp) 3175 { 3176 } 3177 3178 static void 3179 sppp_ipcp_tls(struct sppp *sp) 3180 { 3181 /* indicate to LCP that it must stay alive */ 3182 sp->lcp.protos |= (1 << IDX_IPCP); 3183 } 3184 3185 static void 3186 sppp_ipcp_tlf(struct sppp *sp) 3187 { 3188 /* we no longer need LCP */ 3189 sp->lcp.protos &= ~(1 << IDX_IPCP); 3190 } 3191 3192 static void 3193 sppp_ipcp_scr(struct sppp *sp) 3194 { 3195 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3196 #ifdef INET 3197 uint32_t ouraddr; 3198 #endif 3199 int i = 0; 3200 3201 #ifdef notyet 3202 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3203 opt[i++] = IPCP_OPT_COMPRESSION; 3204 opt[i++] = 6; 3205 opt[i++] = 0; /* VJ header compression */ 3206 opt[i++] = 0x2d; /* VJ header compression */ 3207 opt[i++] = max_slot_id; 3208 opt[i++] = comp_slot_id; 3209 } 3210 #endif 3211 3212 #ifdef INET 3213 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3214 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3215 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3216 else 3217 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3218 opt[i++] = IPCP_OPT_ADDRESS; 3219 opt[i++] = 6; 3220 opt[i++] = ouraddr >> 24; 3221 opt[i++] = ouraddr >> 16; 3222 opt[i++] = ouraddr >> 8; 3223 opt[i++] = ouraddr; 3224 } 3225 #endif 3226 3227 if (sp->query_dns & 1) { 3228 opt[i++] = IPCP_OPT_PRIMDNS; 3229 opt[i++] = 6; 3230 opt[i++] = sp->dns_addrs[0] >> 24; 3231 opt[i++] = sp->dns_addrs[0] >> 16; 3232 opt[i++] = sp->dns_addrs[0] >> 8; 3233 opt[i++] = sp->dns_addrs[0]; 3234 } 3235 if (sp->query_dns & 2) { 3236 opt[i++] = IPCP_OPT_SECDNS; 3237 opt[i++] = 6; 3238 opt[i++] = sp->dns_addrs[1] >> 24; 3239 opt[i++] = sp->dns_addrs[1] >> 16; 3240 opt[i++] = sp->dns_addrs[1] >> 8; 3241 opt[i++] = sp->dns_addrs[1]; 3242 } 3243 3244 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3245 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3246 } 3247 3248 3249 /* 3250 *--------------------------------------------------------------------------* 3251 * * 3252 * The IPv6CP implementation. * 3253 * * 3254 *--------------------------------------------------------------------------* 3255 */ 3256 3257 #ifdef INET6 3258 static void 3259 sppp_ipv6cp_init(struct sppp *sp) 3260 { 3261 sp->ipv6cp.opts = 0; 3262 sp->ipv6cp.flags = 0; 3263 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3264 sp->fail_counter[IDX_IPV6CP] = 0; 3265 sp->pp_seq[IDX_IPV6CP] = 0; 3266 sp->pp_rseq[IDX_IPV6CP] = 0; 3267 callout_init(&sp->ch[IDX_IPV6CP], 0); 3268 } 3269 3270 static void 3271 sppp_ipv6cp_up(struct sppp *sp) 3272 { 3273 sppp_up_event(&ipv6cp, sp); 3274 } 3275 3276 static void 3277 sppp_ipv6cp_down(struct sppp *sp) 3278 { 3279 sppp_down_event(&ipv6cp, sp); 3280 } 3281 3282 static void 3283 sppp_ipv6cp_open(struct sppp *sp) 3284 { 3285 STDDCL; 3286 struct in6_addr myaddr, hisaddr; 3287 3288 #ifdef IPV6CP_MYIFID_DYN 3289 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3290 #else 3291 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3292 #endif 3293 3294 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3295 /* 3296 * If we don't have our address, this probably means our 3297 * interface doesn't want to talk IPv6 at all. (This could 3298 * be the case if somebody wants to speak only IPX, for 3299 * example.) Don't open IPv6CP in this case. 3300 */ 3301 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3302 /* XXX this message should go away */ 3303 if (debug) 3304 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3305 ifp->if_xname); 3306 return; 3307 } 3308 3309 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3310 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3311 sppp_open_event(&ipv6cp, sp); 3312 } 3313 3314 static void 3315 sppp_ipv6cp_close(struct sppp *sp) 3316 { 3317 sppp_close_event(&ipv6cp, sp); 3318 } 3319 3320 static void 3321 sppp_ipv6cp_TO(void *cookie) 3322 { 3323 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3324 } 3325 3326 /* 3327 * Analyze a configure request. Return true if it was agreeable, and 3328 * caused action sca, false if it has been rejected or nak'ed, and 3329 * caused action scn. (The return value is used to make the state 3330 * transition decision in the state automaton.) 3331 */ 3332 static int 3333 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3334 { 3335 u_char *buf, *r, *p; 3336 struct ifnet *ifp = &sp->pp_if; 3337 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3338 struct in6_addr myaddr, desiredaddr, suggestaddr; 3339 int ifidcount; 3340 int type; 3341 int collision, nohisaddr; 3342 3343 len -= 4; 3344 origlen = len; 3345 /* 3346 * Make sure to allocate a buf that can at least hold a 3347 * conf-nak with an `address' option. We might need it below. 3348 */ 3349 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3350 if (! buf) 3351 return (0); 3352 3353 /* pass 1: see if we can recognize them */ 3354 if (debug) 3355 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3356 ifp->if_xname); 3357 p = (void *)(h + 1); 3358 ifidcount = 0; 3359 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3360 /* Sanity check option length */ 3361 if (p[1] > len) { 3362 /* XXX just RXJ? */ 3363 addlog("%s: received malicious IPCPv6 option, " 3364 "dropping\n", ifp->if_xname); 3365 goto drop; 3366 } 3367 if (debug) 3368 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3369 switch (*p) { 3370 case IPV6CP_OPT_IFID: 3371 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3372 /* correctly formed address option */ 3373 ifidcount++; 3374 continue; 3375 } 3376 if (debug) 3377 addlog(" [invalid]"); 3378 break; 3379 #ifdef notyet 3380 case IPV6CP_OPT_COMPRESSION: 3381 if (len >= 4 && p[1] >= 4) { 3382 /* correctly formed compress option */ 3383 continue; 3384 } 3385 if (debug) 3386 addlog(" [invalid]"); 3387 break; 3388 #endif 3389 default: 3390 /* Others not supported. */ 3391 if (debug) 3392 addlog(" [rej]"); 3393 break; 3394 } 3395 /* Add the option to rejected list. */ 3396 bcopy (p, r, p[1]); 3397 r += p[1]; 3398 rlen += p[1]; 3399 } 3400 if (rlen) { 3401 if (debug) 3402 addlog(" send conf-rej\n"); 3403 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3404 goto end; 3405 } else if (debug) 3406 addlog("\n"); 3407 3408 /* pass 2: parse option values */ 3409 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3410 if (debug) 3411 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3412 ifp->if_xname); 3413 p = (void *)(h + 1); 3414 len = origlen; 3415 type = CONF_ACK; 3416 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3417 if (debug) 3418 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3419 switch (*p) { 3420 #ifdef notyet 3421 case IPV6CP_OPT_COMPRESSION: 3422 continue; 3423 #endif 3424 case IPV6CP_OPT_IFID: 3425 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3426 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3427 collision = (memcmp(&desiredaddr.s6_addr[8], 3428 &myaddr.s6_addr[8], 8) == 0); 3429 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3430 3431 desiredaddr.s6_addr16[0] = htons(0xfe80); 3432 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3433 3434 if (!collision && !nohisaddr) { 3435 /* no collision, hisaddr known - Conf-Ack */ 3436 type = CONF_ACK; 3437 3438 if (debug) { 3439 addlog(" %s [%s]", 3440 ip6_sprintf(&desiredaddr), 3441 sppp_cp_type_name(type)); 3442 } 3443 continue; 3444 } 3445 3446 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3447 if (collision && nohisaddr) { 3448 /* collision, hisaddr unknown - Conf-Rej */ 3449 type = CONF_REJ; 3450 memset(&p[2], 0, 8); 3451 } else { 3452 /* 3453 * - no collision, hisaddr unknown, or 3454 * - collision, hisaddr known 3455 * Conf-Nak, suggest hisaddr 3456 */ 3457 type = CONF_NAK; 3458 sppp_suggest_ip6_addr(sp, &suggestaddr); 3459 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3460 } 3461 if (debug) 3462 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3463 sppp_cp_type_name(type)); 3464 break; 3465 } 3466 /* Add the option to nak'ed list. */ 3467 bcopy (p, r, p[1]); 3468 r += p[1]; 3469 rlen += p[1]; 3470 } 3471 3472 if (rlen == 0 && type == CONF_ACK) { 3473 if (debug) 3474 addlog(" send %s\n", sppp_cp_type_name(type)); 3475 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3476 } else { 3477 #ifdef notdef 3478 if (type == CONF_ACK) 3479 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3480 #endif 3481 3482 if (debug) { 3483 addlog(" send %s suggest %s\n", 3484 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3485 } 3486 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3487 } 3488 3489 end: 3490 free(buf, M_TEMP); 3491 return (rlen == 0); 3492 3493 drop: 3494 free(buf, M_TEMP); 3495 return -1; 3496 } 3497 3498 /* 3499 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3500 * negotiation. 3501 */ 3502 static void 3503 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3504 { 3505 u_char *buf, *p; 3506 struct ifnet *ifp = &sp->pp_if; 3507 int debug = ifp->if_flags & IFF_DEBUG; 3508 3509 len -= 4; 3510 buf = malloc (len, M_TEMP, M_NOWAIT); 3511 if (!buf) 3512 return; 3513 3514 if (debug) 3515 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3516 ifp->if_xname); 3517 3518 p = (void *)(h + 1); 3519 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3520 if (p[1] > len) { 3521 /* XXX just RXJ? */ 3522 addlog("%s: received malicious IPCPv6 option, " 3523 "dropping\n", ifp->if_xname); 3524 goto drop; 3525 } 3526 if (debug) 3527 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3528 switch (*p) { 3529 case IPV6CP_OPT_IFID: 3530 /* 3531 * Peer doesn't grok address option. This is 3532 * bad. XXX Should we better give up here? 3533 */ 3534 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3535 break; 3536 #ifdef notyet 3537 case IPV6CP_OPT_COMPRESS: 3538 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3539 break; 3540 #endif 3541 } 3542 } 3543 if (debug) 3544 addlog("\n"); 3545 drop: 3546 free(buf, M_TEMP); 3547 return; 3548 } 3549 3550 /* 3551 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3552 * negotiation. 3553 */ 3554 static void 3555 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3556 { 3557 u_char *buf, *p; 3558 struct ifnet *ifp = &sp->pp_if; 3559 int debug = ifp->if_flags & IFF_DEBUG; 3560 struct in6_addr suggestaddr; 3561 3562 len -= 4; 3563 buf = malloc (len, M_TEMP, M_NOWAIT); 3564 if (!buf) 3565 return; 3566 3567 if (debug) 3568 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3569 ifp->if_xname); 3570 3571 p = (void *)(h + 1); 3572 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3573 if (p[1] > len) { 3574 /* XXX just RXJ? */ 3575 addlog("%s: received malicious IPCPv6 option, " 3576 "dropping\n", ifp->if_xname); 3577 goto drop; 3578 } 3579 if (debug) 3580 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3581 switch (*p) { 3582 case IPV6CP_OPT_IFID: 3583 /* 3584 * Peer doesn't like our local ifid. See 3585 * if we can do something for him. We'll drop 3586 * him our address then. 3587 */ 3588 if (len < 10 || p[1] != 10) 3589 break; 3590 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3591 suggestaddr.s6_addr16[0] = htons(0xfe80); 3592 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3593 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3594 3595 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3596 if (debug) 3597 addlog(" [suggestaddr %s]", 3598 ip6_sprintf(&suggestaddr)); 3599 #ifdef IPV6CP_MYIFID_DYN 3600 /* 3601 * When doing dynamic address assignment, 3602 * we accept his offer. 3603 */ 3604 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3605 struct in6_addr lastsuggest; 3606 /* 3607 * If <suggested myaddr from peer> equals to 3608 * <hisaddr we have suggested last time>, 3609 * we have a collision. generate new random 3610 * ifid. 3611 */ 3612 sppp_suggest_ip6_addr(&lastsuggest); 3613 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3614 lastsuggest)) { 3615 if (debug) 3616 addlog(" [random]"); 3617 sppp_gen_ip6_addr(sp, &suggestaddr); 3618 } 3619 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3620 if (debug) 3621 addlog(" [agree]"); 3622 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3623 } 3624 #else 3625 /* 3626 * Since we do not do dynamic address assignment, 3627 * we ignore it and thus continue to negotiate 3628 * our already existing value. This can possibly 3629 * go into infinite request-reject loop. 3630 * 3631 * This is not likely because we normally use 3632 * ifid based on MAC-address. 3633 * If you have no ethernet card on the node, too bad. 3634 * XXX should we use fail_counter? 3635 */ 3636 #endif 3637 break; 3638 #ifdef notyet 3639 case IPV6CP_OPT_COMPRESS: 3640 /* 3641 * Peer wants different compression parameters. 3642 */ 3643 break; 3644 #endif 3645 } 3646 } 3647 if (debug) 3648 addlog("\n"); 3649 drop: 3650 free(buf, M_TEMP); 3651 return; 3652 } 3653 3654 static void 3655 sppp_ipv6cp_tlu(struct sppp *sp) 3656 { 3657 /* we are up - notify isdn daemon */ 3658 if (sp->pp_con) 3659 sp->pp_con(sp); 3660 } 3661 3662 static void 3663 sppp_ipv6cp_tld(struct sppp *sp) 3664 { 3665 } 3666 3667 static void 3668 sppp_ipv6cp_tls(struct sppp *sp) 3669 { 3670 /* indicate to LCP that it must stay alive */ 3671 sp->lcp.protos |= (1 << IDX_IPV6CP); 3672 } 3673 3674 static void 3675 sppp_ipv6cp_tlf(struct sppp *sp) 3676 { 3677 /* we no longer need LCP */ 3678 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3679 } 3680 3681 static void 3682 sppp_ipv6cp_scr(struct sppp *sp) 3683 { 3684 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3685 struct in6_addr ouraddr; 3686 int i = 0; 3687 3688 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3689 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3690 opt[i++] = IPV6CP_OPT_IFID; 3691 opt[i++] = 10; 3692 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3693 i += 8; 3694 } 3695 3696 #ifdef notyet 3697 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3698 opt[i++] = IPV6CP_OPT_COMPRESSION; 3699 opt[i++] = 4; 3700 opt[i++] = 0; /* TBD */ 3701 opt[i++] = 0; /* TBD */ 3702 /* variable length data may follow */ 3703 } 3704 #endif 3705 3706 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3707 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3708 } 3709 #else /*INET6*/ 3710 static void 3711 sppp_ipv6cp_init(struct sppp *sp) 3712 { 3713 } 3714 3715 static void 3716 sppp_ipv6cp_up(struct sppp *sp) 3717 { 3718 } 3719 3720 static void 3721 sppp_ipv6cp_down(struct sppp *sp) 3722 { 3723 } 3724 3725 static void 3726 sppp_ipv6cp_open(struct sppp *sp) 3727 { 3728 } 3729 3730 static void 3731 sppp_ipv6cp_close(struct sppp *sp) 3732 { 3733 } 3734 3735 static void 3736 sppp_ipv6cp_TO(void *sp) 3737 { 3738 } 3739 3740 static int 3741 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3742 int len) 3743 { 3744 return 0; 3745 } 3746 3747 static void 3748 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3749 int len) 3750 { 3751 } 3752 3753 static void 3754 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3755 int len) 3756 { 3757 } 3758 3759 static void 3760 sppp_ipv6cp_tlu(struct sppp *sp) 3761 { 3762 } 3763 3764 static void 3765 sppp_ipv6cp_tld(struct sppp *sp) 3766 { 3767 } 3768 3769 static void 3770 sppp_ipv6cp_tls(struct sppp *sp) 3771 { 3772 } 3773 3774 static void 3775 sppp_ipv6cp_tlf(struct sppp *sp) 3776 { 3777 } 3778 3779 static void 3780 sppp_ipv6cp_scr(struct sppp *sp) 3781 { 3782 } 3783 #endif /*INET6*/ 3784 3785 3786 /* 3787 *--------------------------------------------------------------------------* 3788 * * 3789 * The CHAP implementation. * 3790 * * 3791 *--------------------------------------------------------------------------* 3792 */ 3793 3794 /* 3795 * The authentication protocols don't employ a full-fledged state machine as 3796 * the control protocols do, since they do have Open and Close events, but 3797 * not Up and Down, nor are they explicitly terminated. Also, use of the 3798 * authentication protocols may be different in both directions (this makes 3799 * sense, think of a machine that never accepts incoming calls but only 3800 * calls out, it doesn't require the called party to authenticate itself). 3801 * 3802 * Our state machine for the local authentication protocol (we are requesting 3803 * the peer to authenticate) looks like: 3804 * 3805 * RCA- 3806 * +--------------------------------------------+ 3807 * V scn,tld| 3808 * +--------+ Close +---------+ RCA+ 3809 * | |<----------------------------------| |------+ 3810 * +--->| Closed | TO* | Opened | sca | 3811 * | | |-----+ +-------| |<-----+ 3812 * | +--------+ irc | | +---------+ 3813 * | ^ | | ^ 3814 * | | | | | 3815 * | | | | | 3816 * | TO-| | | | 3817 * | |tld TO+ V | | 3818 * | | +------->+ | | 3819 * | | | | | | 3820 * | +--------+ V | | 3821 * | | |<----+<--------------------+ | 3822 * | | Req- | scr | 3823 * | | Sent | | 3824 * | | | | 3825 * | +--------+ | 3826 * | RCA- | | RCA+ | 3827 * +------+ +------------------------------------------+ 3828 * scn,tld sca,irc,ict,tlu 3829 * 3830 * 3831 * with: 3832 * 3833 * Open: LCP reached authentication phase 3834 * Close: LCP reached terminate phase 3835 * 3836 * RCA+: received reply (pap-req, chap-response), acceptable 3837 * RCN: received reply (pap-req, chap-response), not acceptable 3838 * TO+: timeout with restart counter >= 0 3839 * TO-: timeout with restart counter < 0 3840 * TO*: reschedule timeout for CHAP 3841 * 3842 * scr: send request packet (none for PAP, chap-challenge) 3843 * sca: send ack packet (pap-ack, chap-success) 3844 * scn: send nak packet (pap-nak, chap-failure) 3845 * ict: initialize re-challenge timer (CHAP only) 3846 * 3847 * tlu: this-layer-up, LCP reaches network phase 3848 * tld: this-layer-down, LCP enters terminate phase 3849 * 3850 * Note that in CHAP mode, after sending a new challenge, while the state 3851 * automaton falls back into Req-Sent state, it doesn't signal a tld 3852 * event to LCP, so LCP remains in network phase. Only after not getting 3853 * any response (or after getting an unacceptable response), CHAP closes, 3854 * causing LCP to enter terminate phase. 3855 * 3856 * With PAP, there is no initial request that can be sent. The peer is 3857 * expected to send one based on the successful negotiation of PAP as 3858 * the authentication protocol during the LCP option negotiation. 3859 * 3860 * Incoming authentication protocol requests (remote requests 3861 * authentication, we are peer) don't employ a state machine at all, 3862 * they are simply answered. Some peers [Ascend P50 firmware rev 3863 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3864 * still in authentication phase (thereby violating the standard that 3865 * demands that these NCP packets are to be discarded), so we keep 3866 * track of the peer demanding us to authenticate, and only proceed to 3867 * phase network once we've seen a positive acknowledge for the 3868 * authentication. 3869 */ 3870 3871 /* 3872 * Handle incoming CHAP packets. 3873 */ 3874 void 3875 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3876 { 3877 STDDCL; 3878 struct lcp_header *h; 3879 int len, x; 3880 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3881 int value_len, name_len; 3882 MD5_CTX ctx; 3883 3884 len = m->m_pkthdr.len; 3885 if (len < 4) { 3886 if (debug) 3887 log(LOG_DEBUG, 3888 "%s: chap invalid packet length: %d bytes\n", 3889 ifp->if_xname, len); 3890 return; 3891 } 3892 h = mtod(m, struct lcp_header *); 3893 if (len > ntohs(h->len)) 3894 len = ntohs(h->len); 3895 3896 switch (h->type) { 3897 /* challenge, failure and success are his authproto */ 3898 case CHAP_CHALLENGE: 3899 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3900 /* can't do anything useful */ 3901 sp->pp_auth_failures++; 3902 printf("%s: chap input without my name and my secret being set\n", 3903 ifp->if_xname); 3904 break; 3905 } 3906 value = 1 + (u_char *)(h + 1); 3907 value_len = value[-1]; 3908 name = value + value_len; 3909 name_len = len - value_len - 5; 3910 if (name_len < 0) { 3911 if (debug) { 3912 log(LOG_DEBUG, 3913 "%s: chap corrupted challenge " 3914 "<%s id=0x%x len=%d", 3915 ifp->if_xname, 3916 sppp_auth_type_name(PPP_CHAP, h->type), 3917 h->ident, ntohs(h->len)); 3918 if (len > 4) 3919 sppp_print_bytes((u_char *)(h + 1), 3920 len - 4); 3921 addlog(">\n"); 3922 } 3923 break; 3924 } 3925 3926 if (debug) { 3927 log(LOG_DEBUG, 3928 "%s: chap input <%s id=0x%x len=%d name=", 3929 ifp->if_xname, 3930 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3931 ntohs(h->len)); 3932 sppp_print_string((char *) name, name_len); 3933 addlog(" value-size=%d value=", value_len); 3934 sppp_print_bytes(value, value_len); 3935 addlog(">\n"); 3936 } 3937 3938 /* Compute reply value. */ 3939 MD5Init(&ctx); 3940 MD5Update(&ctx, &h->ident, 1); 3941 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3942 MD5Update(&ctx, value, value_len); 3943 MD5Final(digest, &ctx); 3944 dsize = sizeof digest; 3945 3946 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3947 sizeof dsize, (const char *)&dsize, 3948 sizeof digest, digest, 3949 sp->myauth.name_len, 3950 sp->myauth.name, 3951 0); 3952 break; 3953 3954 case CHAP_SUCCESS: 3955 if (debug) { 3956 log(LOG_DEBUG, "%s: chap success", 3957 ifp->if_xname); 3958 if (len > 4) { 3959 addlog(": "); 3960 sppp_print_string((char *)(h + 1), len - 4); 3961 } 3962 addlog("\n"); 3963 } 3964 x = splnet(); 3965 sp->pp_auth_failures = 0; 3966 sp->pp_flags &= ~PP_NEEDAUTH; 3967 if (sp->myauth.proto == PPP_CHAP && 3968 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3969 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3970 /* 3971 * We are authenticator for CHAP but didn't 3972 * complete yet. Leave it to tlu to proceed 3973 * to network phase. 3974 */ 3975 splx(x); 3976 break; 3977 } 3978 splx(x); 3979 sppp_phase_network(sp); 3980 break; 3981 3982 case CHAP_FAILURE: 3983 x = splnet(); 3984 sp->pp_auth_failures++; 3985 splx(x); 3986 if (debug) { 3987 log(LOG_INFO, "%s: chap failure", 3988 ifp->if_xname); 3989 if (len > 4) { 3990 addlog(": "); 3991 sppp_print_string((char *)(h + 1), len - 4); 3992 } 3993 addlog("\n"); 3994 } else 3995 log(LOG_INFO, "%s: chap failure\n", 3996 ifp->if_xname); 3997 /* await LCP shutdown by authenticator */ 3998 break; 3999 4000 /* response is my authproto */ 4001 case CHAP_RESPONSE: 4002 if (sp->hisauth.secret == NULL) { 4003 /* can't do anything useful */ 4004 printf("%s: chap input without his secret being set\n", 4005 ifp->if_xname); 4006 break; 4007 } 4008 value = 1 + (u_char *)(h + 1); 4009 value_len = value[-1]; 4010 name = value + value_len; 4011 name_len = len - value_len - 5; 4012 if (name_len < 0) { 4013 if (debug) { 4014 log(LOG_DEBUG, 4015 "%s: chap corrupted response " 4016 "<%s id=0x%x len=%d", 4017 ifp->if_xname, 4018 sppp_auth_type_name(PPP_CHAP, h->type), 4019 h->ident, ntohs(h->len)); 4020 if (len > 4) 4021 sppp_print_bytes((u_char *)(h + 1), 4022 len - 4); 4023 addlog(">\n"); 4024 } 4025 break; 4026 } 4027 if (h->ident != sp->confid[IDX_CHAP]) { 4028 if (debug) 4029 log(LOG_DEBUG, 4030 "%s: chap dropping response for old ID " 4031 "(got %d, expected %d)\n", 4032 ifp->if_xname, 4033 h->ident, sp->confid[IDX_CHAP]); 4034 break; 4035 } 4036 if (sp->hisauth.name != NULL && 4037 (name_len != sp->hisauth.name_len 4038 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4039 log(LOG_INFO, "%s: chap response, his name ", 4040 ifp->if_xname); 4041 sppp_print_string(name, name_len); 4042 addlog(" != expected "); 4043 sppp_print_string(sp->hisauth.name, 4044 sp->hisauth.name_len); 4045 addlog("\n"); 4046 goto chap_failure; 4047 } 4048 if (debug) { 4049 log(LOG_DEBUG, "%s: chap input(%s) " 4050 "<%s id=0x%x len=%d name=", 4051 ifp->if_xname, 4052 sppp_state_name(sp->state[IDX_CHAP]), 4053 sppp_auth_type_name(PPP_CHAP, h->type), 4054 h->ident, ntohs(h->len)); 4055 sppp_print_string((char *)name, name_len); 4056 addlog(" value-size=%d value=", value_len); 4057 sppp_print_bytes(value, value_len); 4058 addlog(">\n"); 4059 } 4060 if (value_len != sizeof(sp->myauth.challenge)) { 4061 if (debug) 4062 log(LOG_DEBUG, 4063 "%s: chap bad hash value length: " 4064 "%d bytes, should be %ld\n", 4065 ifp->if_xname, value_len, 4066 (long) sizeof(sp->myauth.challenge)); 4067 goto chap_failure; 4068 } 4069 4070 MD5Init(&ctx); 4071 MD5Update(&ctx, &h->ident, 1); 4072 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4073 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4074 MD5Final(digest, &ctx); 4075 4076 #define FAILMSG "Failed..." 4077 #define SUCCMSG "Welcome!" 4078 4079 if (value_len != sizeof digest || 4080 memcmp(digest, value, value_len) != 0) { 4081 chap_failure: 4082 /* action scn, tld */ 4083 x = splnet(); 4084 sp->pp_auth_failures++; 4085 splx(x); 4086 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4087 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4088 0); 4089 chap.tld(sp); 4090 break; 4091 } 4092 sp->pp_auth_failures = 0; 4093 /* action sca, perhaps tlu */ 4094 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4095 sp->state[IDX_CHAP] == STATE_OPENED) 4096 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4097 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4098 0); 4099 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4100 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4101 chap.tlu(sp); 4102 } 4103 break; 4104 4105 default: 4106 /* Unknown CHAP packet type -- ignore. */ 4107 if (debug) { 4108 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4109 "<0x%x id=0x%xh len=%d", 4110 ifp->if_xname, 4111 sppp_state_name(sp->state[IDX_CHAP]), 4112 h->type, h->ident, ntohs(h->len)); 4113 if (len > 4) 4114 sppp_print_bytes((u_char *)(h + 1), len - 4); 4115 addlog(">\n"); 4116 } 4117 break; 4118 4119 } 4120 } 4121 4122 static void 4123 sppp_chap_init(struct sppp *sp) 4124 { 4125 /* Chap doesn't have STATE_INITIAL at all. */ 4126 sp->state[IDX_CHAP] = STATE_CLOSED; 4127 sp->fail_counter[IDX_CHAP] = 0; 4128 sp->pp_seq[IDX_CHAP] = 0; 4129 sp->pp_rseq[IDX_CHAP] = 0; 4130 callout_init(&sp->ch[IDX_CHAP], 0); 4131 } 4132 4133 static void 4134 sppp_chap_open(struct sppp *sp) 4135 { 4136 if (sp->myauth.proto == PPP_CHAP && 4137 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4138 /* we are authenticator for CHAP, start it */ 4139 chap.scr(sp); 4140 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4141 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4142 } 4143 /* nothing to be done if we are peer, await a challenge */ 4144 } 4145 4146 static void 4147 sppp_chap_close(struct sppp *sp) 4148 { 4149 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4150 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4151 } 4152 4153 static void 4154 sppp_chap_TO(void *cookie) 4155 { 4156 struct sppp *sp = (struct sppp *)cookie; 4157 STDDCL; 4158 int s; 4159 4160 s = splnet(); 4161 if (debug) 4162 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4163 ifp->if_xname, 4164 sppp_state_name(sp->state[IDX_CHAP]), 4165 sp->rst_counter[IDX_CHAP]); 4166 4167 if (--sp->rst_counter[IDX_CHAP] < 0) 4168 /* TO- event */ 4169 switch (sp->state[IDX_CHAP]) { 4170 case STATE_REQ_SENT: 4171 chap.tld(sp); 4172 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4173 break; 4174 } 4175 else 4176 /* TO+ (or TO*) event */ 4177 switch (sp->state[IDX_CHAP]) { 4178 case STATE_OPENED: 4179 /* TO* event */ 4180 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4181 /* fall through */ 4182 case STATE_REQ_SENT: 4183 chap.scr(sp); 4184 /* sppp_cp_change_state() will restart the timer */ 4185 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4186 break; 4187 } 4188 4189 splx(s); 4190 } 4191 4192 static void 4193 sppp_chap_tlu(struct sppp *sp) 4194 { 4195 STDDCL; 4196 int i, x; 4197 4198 i = 0; 4199 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4200 4201 /* 4202 * Some broken CHAP implementations (Conware CoNet, firmware 4203 * 4.0.?) don't want to re-authenticate their CHAP once the 4204 * initial challenge-response exchange has taken place. 4205 * Provide for an option to avoid rechallenges. 4206 */ 4207 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4208 /* 4209 * Compute the re-challenge timeout. This will yield 4210 * a number between 300 and 810 seconds. 4211 */ 4212 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4213 4214 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4215 } 4216 4217 if (debug) { 4218 log(LOG_DEBUG, 4219 "%s: chap %s, ", 4220 ifp->if_xname, 4221 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4222 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4223 addlog("next re-challenge in %d seconds\n", i); 4224 else 4225 addlog("re-challenging supressed\n"); 4226 } 4227 4228 x = splnet(); 4229 sp->pp_auth_failures = 0; 4230 /* indicate to LCP that we need to be closed down */ 4231 sp->lcp.protos |= (1 << IDX_CHAP); 4232 4233 if (sp->pp_flags & PP_NEEDAUTH) { 4234 /* 4235 * Remote is authenticator, but his auth proto didn't 4236 * complete yet. Defer the transition to network 4237 * phase. 4238 */ 4239 splx(x); 4240 return; 4241 } 4242 splx(x); 4243 4244 /* 4245 * If we are already in phase network, we are done here. This 4246 * is the case if this is a dummy tlu event after a re-challenge. 4247 */ 4248 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4249 sppp_phase_network(sp); 4250 } 4251 4252 static void 4253 sppp_chap_tld(struct sppp *sp) 4254 { 4255 STDDCL; 4256 4257 if (debug) 4258 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4259 callout_stop(&sp->ch[IDX_CHAP]); 4260 sp->lcp.protos &= ~(1 << IDX_CHAP); 4261 4262 lcp.Close(sp); 4263 } 4264 4265 static void 4266 sppp_chap_scr(struct sppp *sp) 4267 { 4268 uint32_t *ch; 4269 u_char clen = 4 * sizeof(uint32_t); 4270 4271 if (sp->myauth.name == NULL) { 4272 /* can't do anything useful */ 4273 printf("%s: chap starting without my name being set\n", 4274 sp->pp_if.if_xname); 4275 return; 4276 } 4277 4278 /* Compute random challenge. */ 4279 ch = (uint32_t *)sp->myauth.challenge; 4280 cprng_strong(kern_cprng, ch, clen, 0); 4281 4282 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4283 4284 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4285 sizeof clen, (const char *)&clen, 4286 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4287 sp->myauth.name_len, 4288 sp->myauth.name, 4289 0); 4290 } 4291 4292 /* 4293 *--------------------------------------------------------------------------* 4294 * * 4295 * The PAP implementation. * 4296 * * 4297 *--------------------------------------------------------------------------* 4298 */ 4299 /* 4300 * For PAP, we need to keep a little state also if we are the peer, not the 4301 * authenticator. This is since we don't get a request to authenticate, but 4302 * have to repeatedly authenticate ourself until we got a response (or the 4303 * retry counter is expired). 4304 */ 4305 4306 /* 4307 * Handle incoming PAP packets. */ 4308 static void 4309 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4310 { 4311 STDDCL; 4312 struct lcp_header *h; 4313 int len, x; 4314 u_char mlen; 4315 char *name, *secret; 4316 int name_len, secret_len; 4317 4318 /* 4319 * Malicious input might leave this uninitialized, so 4320 * init to an impossible value. 4321 */ 4322 secret_len = -1; 4323 4324 len = m->m_pkthdr.len; 4325 if (len < 5) { 4326 if (debug) 4327 log(LOG_DEBUG, 4328 "%s: pap invalid packet length: %d bytes\n", 4329 ifp->if_xname, len); 4330 return; 4331 } 4332 h = mtod(m, struct lcp_header *); 4333 if (len > ntohs(h->len)) 4334 len = ntohs(h->len); 4335 switch (h->type) { 4336 /* PAP request is my authproto */ 4337 case PAP_REQ: 4338 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4339 /* can't do anything useful */ 4340 printf("%s: pap request without his name and his secret being set\n", 4341 ifp->if_xname); 4342 break; 4343 } 4344 name = 1 + (u_char *)(h + 1); 4345 name_len = name[-1]; 4346 secret = name + name_len + 1; 4347 if (name_len > len - 6 || 4348 (secret_len = secret[-1]) > len - 6 - name_len) { 4349 if (debug) { 4350 log(LOG_DEBUG, "%s: pap corrupted input " 4351 "<%s id=0x%x len=%d", 4352 ifp->if_xname, 4353 sppp_auth_type_name(PPP_PAP, h->type), 4354 h->ident, ntohs(h->len)); 4355 if (len > 4) 4356 sppp_print_bytes((u_char *)(h + 1), 4357 len - 4); 4358 addlog(">\n"); 4359 } 4360 break; 4361 } 4362 if (debug) { 4363 log(LOG_DEBUG, "%s: pap input(%s) " 4364 "<%s id=0x%x len=%d name=", 4365 ifp->if_xname, 4366 sppp_state_name(sp->state[IDX_PAP]), 4367 sppp_auth_type_name(PPP_PAP, h->type), 4368 h->ident, ntohs(h->len)); 4369 sppp_print_string((char *)name, name_len); 4370 addlog(" secret="); 4371 sppp_print_string((char *)secret, secret_len); 4372 addlog(">\n"); 4373 } 4374 if (name_len != sp->hisauth.name_len || 4375 secret_len != sp->hisauth.secret_len || 4376 memcmp(name, sp->hisauth.name, name_len) != 0 || 4377 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4378 /* action scn, tld */ 4379 sp->pp_auth_failures++; 4380 mlen = sizeof(FAILMSG) - 1; 4381 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4382 sizeof mlen, (const char *)&mlen, 4383 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4384 0); 4385 pap.tld(sp); 4386 break; 4387 } 4388 /* action sca, perhaps tlu */ 4389 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4390 sp->state[IDX_PAP] == STATE_OPENED) { 4391 mlen = sizeof(SUCCMSG) - 1; 4392 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4393 sizeof mlen, (const char *)&mlen, 4394 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4395 0); 4396 } 4397 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4398 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4399 pap.tlu(sp); 4400 } 4401 break; 4402 4403 /* ack and nak are his authproto */ 4404 case PAP_ACK: 4405 callout_stop(&sp->pap_my_to_ch); 4406 if (debug) { 4407 log(LOG_DEBUG, "%s: pap success", 4408 ifp->if_xname); 4409 name = 1 + (u_char *)(h + 1); 4410 name_len = name[-1]; 4411 if (len > 5 && name_len < len+4) { 4412 addlog(": "); 4413 sppp_print_string(name, name_len); 4414 } 4415 addlog("\n"); 4416 } 4417 x = splnet(); 4418 sp->pp_auth_failures = 0; 4419 sp->pp_flags &= ~PP_NEEDAUTH; 4420 if (sp->myauth.proto == PPP_PAP && 4421 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4422 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4423 /* 4424 * We are authenticator for PAP but didn't 4425 * complete yet. Leave it to tlu to proceed 4426 * to network phase. 4427 */ 4428 splx(x); 4429 break; 4430 } 4431 splx(x); 4432 sppp_phase_network(sp); 4433 break; 4434 4435 case PAP_NAK: 4436 callout_stop(&sp->pap_my_to_ch); 4437 sp->pp_auth_failures++; 4438 if (debug) { 4439 log(LOG_INFO, "%s: pap failure", 4440 ifp->if_xname); 4441 name = 1 + (u_char *)(h + 1); 4442 name_len = name[-1]; 4443 if (len > 5 && name_len < len+4) { 4444 addlog(": "); 4445 sppp_print_string(name, name_len); 4446 } 4447 addlog("\n"); 4448 } else 4449 log(LOG_INFO, "%s: pap failure\n", 4450 ifp->if_xname); 4451 /* await LCP shutdown by authenticator */ 4452 break; 4453 4454 default: 4455 /* Unknown PAP packet type -- ignore. */ 4456 if (debug) { 4457 log(LOG_DEBUG, "%s: pap corrupted input " 4458 "<0x%x id=0x%x len=%d", 4459 ifp->if_xname, 4460 h->type, h->ident, ntohs(h->len)); 4461 if (len > 4) 4462 sppp_print_bytes((u_char *)(h + 1), len - 4); 4463 addlog(">\n"); 4464 } 4465 break; 4466 4467 } 4468 } 4469 4470 static void 4471 sppp_pap_init(struct sppp *sp) 4472 { 4473 /* PAP doesn't have STATE_INITIAL at all. */ 4474 sp->state[IDX_PAP] = STATE_CLOSED; 4475 sp->fail_counter[IDX_PAP] = 0; 4476 sp->pp_seq[IDX_PAP] = 0; 4477 sp->pp_rseq[IDX_PAP] = 0; 4478 callout_init(&sp->ch[IDX_PAP], 0); 4479 callout_init(&sp->pap_my_to_ch, 0); 4480 } 4481 4482 static void 4483 sppp_pap_open(struct sppp *sp) 4484 { 4485 if (sp->hisauth.proto == PPP_PAP && 4486 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4487 /* we are authenticator for PAP, start our timer */ 4488 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4489 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4490 } 4491 if (sp->myauth.proto == PPP_PAP) { 4492 /* we are peer, send a request, and start a timer */ 4493 pap.scr(sp); 4494 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4495 sppp_pap_my_TO, sp); 4496 } 4497 } 4498 4499 static void 4500 sppp_pap_close(struct sppp *sp) 4501 { 4502 if (sp->state[IDX_PAP] != STATE_CLOSED) 4503 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4504 } 4505 4506 /* 4507 * That's the timeout routine if we are authenticator. Since the 4508 * authenticator is basically passive in PAP, we can't do much here. 4509 */ 4510 static void 4511 sppp_pap_TO(void *cookie) 4512 { 4513 struct sppp *sp = (struct sppp *)cookie; 4514 STDDCL; 4515 int s; 4516 4517 s = splnet(); 4518 if (debug) 4519 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4520 ifp->if_xname, 4521 sppp_state_name(sp->state[IDX_PAP]), 4522 sp->rst_counter[IDX_PAP]); 4523 4524 if (--sp->rst_counter[IDX_PAP] < 0) 4525 /* TO- event */ 4526 switch (sp->state[IDX_PAP]) { 4527 case STATE_REQ_SENT: 4528 pap.tld(sp); 4529 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4530 break; 4531 } 4532 else 4533 /* TO+ event, not very much we could do */ 4534 switch (sp->state[IDX_PAP]) { 4535 case STATE_REQ_SENT: 4536 /* sppp_cp_change_state() will restart the timer */ 4537 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4538 break; 4539 } 4540 4541 splx(s); 4542 } 4543 4544 /* 4545 * That's the timeout handler if we are peer. Since the peer is active, 4546 * we need to retransmit our PAP request since it is apparently lost. 4547 * XXX We should impose a max counter. 4548 */ 4549 static void 4550 sppp_pap_my_TO(void *cookie) 4551 { 4552 struct sppp *sp = (struct sppp *)cookie; 4553 STDDCL; 4554 4555 if (debug) 4556 log(LOG_DEBUG, "%s: pap peer TO\n", 4557 ifp->if_xname); 4558 4559 pap.scr(sp); 4560 } 4561 4562 static void 4563 sppp_pap_tlu(struct sppp *sp) 4564 { 4565 STDDCL; 4566 int x; 4567 4568 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4569 4570 if (debug) 4571 log(LOG_DEBUG, "%s: %s tlu\n", 4572 ifp->if_xname, pap.name); 4573 4574 x = splnet(); 4575 sp->pp_auth_failures = 0; 4576 /* indicate to LCP that we need to be closed down */ 4577 sp->lcp.protos |= (1 << IDX_PAP); 4578 4579 if (sp->pp_flags & PP_NEEDAUTH) { 4580 /* 4581 * Remote is authenticator, but his auth proto didn't 4582 * complete yet. Defer the transition to network 4583 * phase. 4584 */ 4585 splx(x); 4586 return; 4587 } 4588 splx(x); 4589 sppp_phase_network(sp); 4590 } 4591 4592 static void 4593 sppp_pap_tld(struct sppp *sp) 4594 { 4595 STDDCL; 4596 4597 if (debug) 4598 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4599 callout_stop(&sp->ch[IDX_PAP]); 4600 callout_stop(&sp->pap_my_to_ch); 4601 sp->lcp.protos &= ~(1 << IDX_PAP); 4602 4603 lcp.Close(sp); 4604 } 4605 4606 static void 4607 sppp_pap_scr(struct sppp *sp) 4608 { 4609 u_char idlen, pwdlen; 4610 4611 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4612 /* can't do anything useful */ 4613 printf("%s: pap starting without my name and secret being set\n", 4614 sp->pp_if.if_xname); 4615 return; 4616 } 4617 4618 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4619 pwdlen = sp->myauth.secret_len; 4620 idlen = sp->myauth.name_len; 4621 4622 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4623 sizeof idlen, (const char *)&idlen, 4624 idlen, sp->myauth.name, 4625 sizeof pwdlen, (const char *)&pwdlen, 4626 pwdlen, sp->myauth.secret, 4627 0); 4628 } 4629 4630 /* 4631 * Random miscellaneous functions. 4632 */ 4633 4634 /* 4635 * Send a PAP or CHAP proto packet. 4636 * 4637 * Varadic function, each of the elements for the ellipsis is of type 4638 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4639 * mlen == 0. 4640 * NOTE: never declare variadic functions with types subject to type 4641 * promotion (i.e. u_char). This is asking for big trouble depending 4642 * on the architecture you are on... 4643 */ 4644 4645 static void 4646 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4647 unsigned int type, unsigned int id, 4648 ...) 4649 { 4650 STDDCL; 4651 struct lcp_header *lh; 4652 struct mbuf *m; 4653 u_char *p; 4654 int len; 4655 size_t pkthdrlen; 4656 unsigned int mlen; 4657 const char *msg; 4658 va_list ap; 4659 4660 MGETHDR(m, M_DONTWAIT, MT_DATA); 4661 if (! m) 4662 return; 4663 m->m_pkthdr.rcvif = 0; 4664 4665 if (sp->pp_flags & PP_NOFRAMING) { 4666 *mtod(m, uint16_t *) = htons(cp->proto); 4667 pkthdrlen = 2; 4668 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4669 } else { 4670 struct ppp_header *h; 4671 h = mtod(m, struct ppp_header *); 4672 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4673 h->control = PPP_UI; /* Unnumbered Info */ 4674 h->protocol = htons(cp->proto); 4675 pkthdrlen = PPP_HEADER_LEN; 4676 4677 lh = (struct lcp_header *)(h + 1); 4678 } 4679 4680 lh->type = type; 4681 lh->ident = id; 4682 p = (u_char *)(lh + 1); 4683 4684 va_start(ap, id); 4685 len = 0; 4686 4687 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4688 msg = va_arg(ap, const char *); 4689 len += mlen; 4690 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4691 va_end(ap); 4692 m_freem(m); 4693 return; 4694 } 4695 4696 memcpy(p, msg, mlen); 4697 p += mlen; 4698 } 4699 va_end(ap); 4700 4701 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4702 lh->len = htons(LCP_HEADER_LEN + len); 4703 4704 if (debug) { 4705 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4706 ifp->if_xname, cp->name, 4707 sppp_auth_type_name(cp->proto, lh->type), 4708 lh->ident, ntohs(lh->len)); 4709 if (len) 4710 sppp_print_bytes((u_char *)(lh + 1), len); 4711 addlog(">\n"); 4712 } 4713 if (IF_QFULL(&sp->pp_cpq)) { 4714 IF_DROP(&sp->pp_fastq); 4715 IF_DROP(&ifp->if_snd); 4716 m_freem(m); 4717 ++ifp->if_oerrors; 4718 return; 4719 } else 4720 IF_ENQUEUE(&sp->pp_cpq, m); 4721 if (! (ifp->if_flags & IFF_OACTIVE)) 4722 (*ifp->if_start)(ifp); 4723 ifp->if_obytes += m->m_pkthdr.len + 3; 4724 } 4725 4726 /* 4727 * Send keepalive packets, every 10 seconds. 4728 */ 4729 static void 4730 sppp_keepalive(void *dummy) 4731 { 4732 struct sppp *sp; 4733 int s; 4734 time_t now; 4735 4736 s = splnet(); 4737 now = time_uptime; 4738 for (sp=spppq; sp; sp=sp->pp_next) { 4739 struct ifnet *ifp = &sp->pp_if; 4740 4741 /* check idle timeout */ 4742 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4743 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4744 /* idle timeout is enabled for this interface */ 4745 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4746 if (ifp->if_flags & IFF_DEBUG) 4747 printf("%s: no activity for %lu seconds\n", 4748 sp->pp_if.if_xname, 4749 (unsigned long)(now-sp->pp_last_activity)); 4750 lcp.Close(sp); 4751 continue; 4752 } 4753 } 4754 4755 /* Keepalive mode disabled or channel down? */ 4756 if (! (sp->pp_flags & PP_KEEPALIVE) || 4757 ! (ifp->if_flags & IFF_RUNNING)) 4758 continue; 4759 4760 /* No keepalive in PPP mode if LCP not opened yet. */ 4761 if (! (sp->pp_flags & PP_CISCO) && 4762 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4763 continue; 4764 4765 /* No echo reply, but maybe user data passed through? */ 4766 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4767 sp->pp_alivecnt = 0; 4768 continue; 4769 } 4770 4771 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4772 /* No keepalive packets got. Stop the interface. */ 4773 if_down (ifp); 4774 IF_PURGE(&sp->pp_cpq); 4775 if (! (sp->pp_flags & PP_CISCO)) { 4776 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4777 ifp->if_xname); 4778 sp->pp_alivecnt = 0; 4779 4780 /* we are down, close all open protocols */ 4781 lcp.Close(sp); 4782 4783 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4784 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4785 4786 /* Close connection immediately, completition of this 4787 * will summon the magic needed to reestablish it. */ 4788 if (sp->pp_tlf) 4789 sp->pp_tlf(sp); 4790 continue; 4791 } 4792 } 4793 if (sp->pp_alivecnt < sp->pp_maxalive) 4794 ++sp->pp_alivecnt; 4795 if (sp->pp_flags & PP_CISCO) 4796 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4797 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4798 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4799 int32_t nmagic = htonl(sp->lcp.magic); 4800 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4801 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4802 sp->lcp.echoid, 4, &nmagic); 4803 } 4804 } 4805 splx(s); 4806 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4807 } 4808 4809 #ifdef INET 4810 /* 4811 * Get both IP addresses. 4812 */ 4813 static void 4814 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4815 { 4816 struct ifnet *ifp = &sp->pp_if; 4817 struct ifaddr *ifa; 4818 struct sockaddr_in *si, *sm; 4819 uint32_t ssrc, ddst; 4820 4821 sm = NULL; 4822 ssrc = ddst = 0; 4823 /* 4824 * Pick the first AF_INET address from the list, 4825 * aliases don't make any sense on a p2p link anyway. 4826 */ 4827 si = 0; 4828 IFADDR_FOREACH(ifa, ifp) { 4829 if (ifa->ifa_addr->sa_family == AF_INET) { 4830 si = (struct sockaddr_in *)ifa->ifa_addr; 4831 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4832 if (si) 4833 break; 4834 } 4835 } 4836 if (ifa) { 4837 if (si && si->sin_addr.s_addr) { 4838 ssrc = si->sin_addr.s_addr; 4839 if (srcmask) 4840 *srcmask = ntohl(sm->sin_addr.s_addr); 4841 } 4842 4843 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4844 if (si && si->sin_addr.s_addr) 4845 ddst = si->sin_addr.s_addr; 4846 } 4847 4848 if (dst) *dst = ntohl(ddst); 4849 if (src) *src = ntohl(ssrc); 4850 } 4851 4852 /* 4853 * Set IP addresses. Must be called at splnet. 4854 * If an address is 0, leave it the way it is. 4855 */ 4856 static void 4857 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4858 { 4859 STDDCL; 4860 struct ifaddr *ifa; 4861 struct sockaddr_in *si, *dest; 4862 4863 /* 4864 * Pick the first AF_INET address from the list, 4865 * aliases don't make any sense on a p2p link anyway. 4866 */ 4867 4868 IFADDR_FOREACH(ifa, ifp) { 4869 if (ifa->ifa_addr->sa_family == AF_INET) { 4870 si = (struct sockaddr_in *)ifa->ifa_addr; 4871 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4872 goto found; 4873 } 4874 } 4875 return; 4876 4877 found: 4878 { 4879 int error; 4880 struct sockaddr_in new_sin = *si; 4881 struct sockaddr_in new_dst = *dest; 4882 4883 /* 4884 * Scrub old routes now instead of calling in_ifinit with 4885 * scrub=1, because we may change the dstaddr 4886 * before the call to in_ifinit. 4887 */ 4888 in_ifscrub(ifp, ifatoia(ifa)); 4889 4890 if (myaddr != 0) 4891 new_sin.sin_addr.s_addr = htonl(myaddr); 4892 if (hisaddr != 0) { 4893 new_dst.sin_addr.s_addr = htonl(hisaddr); 4894 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4895 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4896 *dest = new_dst; /* fix dstaddr in place */ 4897 } 4898 } 4899 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4900 if (debug && error) 4901 { 4902 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4903 " failed, error=%d\n", ifp->if_xname, error); 4904 } 4905 if (!error) { 4906 (void)pfil_run_hooks(if_pfil, 4907 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4908 } 4909 } 4910 } 4911 4912 /* 4913 * Clear IP addresses. Must be called at splnet. 4914 */ 4915 static void 4916 sppp_clear_ip_addrs(struct sppp *sp) 4917 { 4918 struct ifnet *ifp = &sp->pp_if; 4919 struct ifaddr *ifa; 4920 struct sockaddr_in *si, *dest; 4921 4922 uint32_t remote; 4923 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4924 remote = sp->ipcp.saved_hisaddr; 4925 else 4926 sppp_get_ip_addrs(sp, 0, &remote, 0); 4927 4928 /* 4929 * Pick the first AF_INET address from the list, 4930 * aliases don't make any sense on a p2p link anyway. 4931 */ 4932 4933 IFADDR_FOREACH(ifa, ifp) { 4934 if (ifa->ifa_addr->sa_family == AF_INET) { 4935 si = (struct sockaddr_in *)ifa->ifa_addr; 4936 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4937 goto found; 4938 } 4939 } 4940 return; 4941 4942 found: 4943 { 4944 struct sockaddr_in new_sin = *si; 4945 4946 in_ifscrub(ifp, ifatoia(ifa)); 4947 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4948 new_sin.sin_addr.s_addr = 0; 4949 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4950 /* replace peer addr in place */ 4951 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4952 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4953 (void)pfil_run_hooks(if_pfil, 4954 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4955 } 4956 } 4957 #endif 4958 4959 #ifdef INET6 4960 /* 4961 * Get both IPv6 addresses. 4962 */ 4963 static void 4964 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4965 struct in6_addr *srcmask) 4966 { 4967 struct ifnet *ifp = &sp->pp_if; 4968 struct ifaddr *ifa; 4969 struct sockaddr_in6 *si, *sm; 4970 struct in6_addr ssrc, ddst; 4971 4972 sm = NULL; 4973 memset(&ssrc, 0, sizeof(ssrc)); 4974 memset(&ddst, 0, sizeof(ddst)); 4975 /* 4976 * Pick the first link-local AF_INET6 address from the list, 4977 * aliases don't make any sense on a p2p link anyway. 4978 */ 4979 si = 0; 4980 IFADDR_FOREACH(ifa, ifp) 4981 if (ifa->ifa_addr->sa_family == AF_INET6) { 4982 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4983 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4984 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4985 break; 4986 } 4987 if (ifa) { 4988 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4989 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4990 if (srcmask) { 4991 memcpy(srcmask, &sm->sin6_addr, 4992 sizeof(*srcmask)); 4993 } 4994 } 4995 4996 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4997 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4998 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4999 } 5000 5001 if (dst) 5002 memcpy(dst, &ddst, sizeof(*dst)); 5003 if (src) 5004 memcpy(src, &ssrc, sizeof(*src)); 5005 } 5006 5007 #ifdef IPV6CP_MYIFID_DYN 5008 /* 5009 * Generate random ifid. 5010 */ 5011 static void 5012 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5013 { 5014 /* TBD */ 5015 } 5016 5017 /* 5018 * Set my IPv6 address. Must be called at splnet. 5019 */ 5020 static void 5021 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5022 { 5023 STDDCL; 5024 struct ifaddr *ifa; 5025 struct sockaddr_in6 *sin6; 5026 5027 /* 5028 * Pick the first link-local AF_INET6 address from the list, 5029 * aliases don't make any sense on a p2p link anyway. 5030 */ 5031 5032 sin6 = NULL; 5033 IFADDR_FOREACH(ifa, ifp) 5034 { 5035 if (ifa->ifa_addr->sa_family == AF_INET6) 5036 { 5037 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5038 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5039 break; 5040 } 5041 } 5042 5043 if (ifa && sin6) 5044 { 5045 int error; 5046 struct sockaddr_in6 new_sin6 = *sin6; 5047 5048 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5049 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5050 if (debug && error) 5051 { 5052 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5053 " failed, error=%d\n", ifp->if_xname, error); 5054 } 5055 if (!error) { 5056 (void)pfil_run_hooks(if_pfil, 5057 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5058 } 5059 } 5060 } 5061 #endif 5062 5063 /* 5064 * Suggest a candidate address to be used by peer. 5065 */ 5066 static void 5067 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5068 { 5069 struct in6_addr myaddr; 5070 struct timeval tv; 5071 5072 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5073 5074 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5075 microtime(&tv); 5076 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5077 myaddr.s6_addr[14] ^= 0xff; 5078 myaddr.s6_addr[15] ^= 0xff; 5079 } else { 5080 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5081 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5082 } 5083 if (suggest) 5084 memcpy(suggest, &myaddr, sizeof(myaddr)); 5085 } 5086 #endif /*INET6*/ 5087 5088 /* 5089 * Process ioctl requests specific to the PPP interface. 5090 * Permissions have already been checked. 5091 */ 5092 static int 5093 sppp_params(struct sppp *sp, u_long cmd, void *data) 5094 { 5095 switch (cmd) { 5096 case SPPPGETAUTHCFG: 5097 { 5098 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5099 int error; 5100 size_t len; 5101 5102 cfg->myauthflags = sp->myauth.flags; 5103 cfg->hisauthflags = sp->hisauth.flags; 5104 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5105 cfg->hisauth = 0; 5106 if (sp->hisauth.proto) 5107 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5108 cfg->myauth = 0; 5109 if (sp->myauth.proto) 5110 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5111 if (cfg->myname_length == 0) { 5112 if (sp->myauth.name != NULL) 5113 cfg->myname_length = sp->myauth.name_len + 1; 5114 } else { 5115 if (sp->myauth.name == NULL) { 5116 cfg->myname_length = 0; 5117 } else { 5118 len = sp->myauth.name_len + 1; 5119 if (cfg->myname_length < len) 5120 return (ENAMETOOLONG); 5121 error = copyout(sp->myauth.name, cfg->myname, len); 5122 if (error) return error; 5123 } 5124 } 5125 if (cfg->hisname_length == 0) { 5126 if (sp->hisauth.name != NULL) 5127 cfg->hisname_length = sp->hisauth.name_len + 1; 5128 } else { 5129 if (sp->hisauth.name == NULL) { 5130 cfg->hisname_length = 0; 5131 } else { 5132 len = sp->hisauth.name_len + 1; 5133 if (cfg->hisname_length < len) 5134 return (ENAMETOOLONG); 5135 error = copyout(sp->hisauth.name, cfg->hisname, len); 5136 if (error) return error; 5137 } 5138 } 5139 } 5140 break; 5141 case SPPPSETAUTHCFG: 5142 { 5143 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5144 int error; 5145 5146 if (sp->myauth.name) { 5147 free(sp->myauth.name, M_DEVBUF); 5148 sp->myauth.name = NULL; 5149 } 5150 if (sp->myauth.secret) { 5151 free(sp->myauth.secret, M_DEVBUF); 5152 sp->myauth.secret = NULL; 5153 } 5154 if (sp->hisauth.name) { 5155 free(sp->hisauth.name, M_DEVBUF); 5156 sp->hisauth.name = NULL; 5157 } 5158 if (sp->hisauth.secret) { 5159 free(sp->hisauth.secret, M_DEVBUF); 5160 sp->hisauth.secret = NULL; 5161 } 5162 5163 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5164 if (cfg->hisname_length >= MCLBYTES) 5165 return (ENAMETOOLONG); 5166 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5167 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5168 if (error) { 5169 free(sp->hisauth.name, M_DEVBUF); 5170 sp->hisauth.name = NULL; 5171 return error; 5172 } 5173 sp->hisauth.name_len = cfg->hisname_length - 1; 5174 sp->hisauth.name[sp->hisauth.name_len] = 0; 5175 } 5176 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5177 if (cfg->hissecret_length >= MCLBYTES) 5178 return (ENAMETOOLONG); 5179 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5180 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5181 if (error) { 5182 free(sp->hisauth.secret, M_DEVBUF); 5183 sp->hisauth.secret = NULL; 5184 return error; 5185 } 5186 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5187 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5188 } 5189 if (cfg->myname != NULL && cfg->myname_length > 0) { 5190 if (cfg->myname_length >= MCLBYTES) 5191 return (ENAMETOOLONG); 5192 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5193 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5194 if (error) { 5195 free(sp->myauth.name, M_DEVBUF); 5196 sp->myauth.name = NULL; 5197 return error; 5198 } 5199 sp->myauth.name_len = cfg->myname_length - 1; 5200 sp->myauth.name[sp->myauth.name_len] = 0; 5201 } 5202 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5203 if (cfg->mysecret_length >= MCLBYTES) 5204 return (ENAMETOOLONG); 5205 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5206 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5207 if (error) { 5208 free(sp->myauth.secret, M_DEVBUF); 5209 sp->myauth.secret = NULL; 5210 return error; 5211 } 5212 sp->myauth.secret_len = cfg->mysecret_length - 1; 5213 sp->myauth.secret[sp->myauth.secret_len] = 0; 5214 } 5215 sp->myauth.flags = cfg->myauthflags; 5216 if (cfg->myauth) 5217 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5218 sp->hisauth.flags = cfg->hisauthflags; 5219 if (cfg->hisauth) 5220 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5221 sp->pp_auth_failures = 0; 5222 if (sp->hisauth.proto != 0) 5223 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5224 else 5225 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5226 } 5227 break; 5228 case SPPPGETLCPCFG: 5229 { 5230 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5231 lcpp->lcp_timeout = sp->lcp.timeout; 5232 } 5233 break; 5234 case SPPPSETLCPCFG: 5235 { 5236 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5237 sp->lcp.timeout = lcpp->lcp_timeout; 5238 } 5239 break; 5240 case SPPPGETSTATUS: 5241 { 5242 struct spppstatus *status = (struct spppstatus *)data; 5243 status->phase = sp->pp_phase; 5244 } 5245 break; 5246 case SPPPGETSTATUSNCP: 5247 { 5248 struct spppstatusncp *status = (struct spppstatusncp *)data; 5249 status->phase = sp->pp_phase; 5250 status->ncpup = sppp_ncp_check(sp); 5251 } 5252 break; 5253 case SPPPGETIDLETO: 5254 { 5255 struct spppidletimeout *to = (struct spppidletimeout *)data; 5256 to->idle_seconds = sp->pp_idle_timeout; 5257 } 5258 break; 5259 case SPPPSETIDLETO: 5260 { 5261 struct spppidletimeout *to = (struct spppidletimeout *)data; 5262 sp->pp_idle_timeout = to->idle_seconds; 5263 } 5264 break; 5265 case SPPPSETAUTHFAILURE: 5266 { 5267 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5268 sp->pp_max_auth_fail = afsettings->max_failures; 5269 sp->pp_auth_failures = 0; 5270 } 5271 break; 5272 case SPPPGETAUTHFAILURES: 5273 { 5274 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5275 stats->auth_failures = sp->pp_auth_failures; 5276 stats->max_failures = sp->pp_max_auth_fail; 5277 } 5278 break; 5279 case SPPPSETDNSOPTS: 5280 { 5281 struct spppdnssettings *req = (struct spppdnssettings *)data; 5282 sp->query_dns = req->query_dns & 3; 5283 } 5284 break; 5285 case SPPPGETDNSOPTS: 5286 { 5287 struct spppdnssettings *req = (struct spppdnssettings *)data; 5288 req->query_dns = sp->query_dns; 5289 } 5290 break; 5291 case SPPPGETDNSADDRS: 5292 { 5293 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5294 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5295 } 5296 break; 5297 case SPPPGETKEEPALIVE: 5298 { 5299 struct spppkeepalivesettings *settings = 5300 (struct spppkeepalivesettings*)data; 5301 settings->maxalive = sp->pp_maxalive; 5302 settings->max_noreceive = sp->pp_max_noreceive; 5303 } 5304 break; 5305 case SPPPSETKEEPALIVE: 5306 { 5307 struct spppkeepalivesettings *settings = 5308 (struct spppkeepalivesettings*)data; 5309 sp->pp_maxalive = settings->maxalive; 5310 sp->pp_max_noreceive = settings->max_noreceive; 5311 } 5312 break; 5313 #if defined(COMPAT_50) || defined(MODULAR) 5314 case __SPPPGETIDLETO50: 5315 { 5316 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5317 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5318 } 5319 break; 5320 case __SPPPSETIDLETO50: 5321 { 5322 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5323 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5324 } 5325 break; 5326 case __SPPPGETKEEPALIVE50: 5327 { 5328 struct spppkeepalivesettings50 *settings = 5329 (struct spppkeepalivesettings50*)data; 5330 settings->maxalive = sp->pp_maxalive; 5331 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5332 } 5333 break; 5334 case __SPPPSETKEEPALIVE50: 5335 { 5336 struct spppkeepalivesettings50 *settings = 5337 (struct spppkeepalivesettings50*)data; 5338 sp->pp_maxalive = settings->maxalive; 5339 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5340 } 5341 break; 5342 #endif /* COMPAT_50 || MODULAR */ 5343 default: 5344 return (EINVAL); 5345 } 5346 5347 return (0); 5348 } 5349 5350 static void 5351 sppp_phase_network(struct sppp *sp) 5352 { 5353 STDDCL; 5354 int i; 5355 uint32_t mask; 5356 5357 sp->pp_phase = SPPP_PHASE_NETWORK; 5358 5359 if (debug) 5360 { 5361 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5362 sppp_phase_name(sp->pp_phase)); 5363 } 5364 5365 /* Notify NCPs now. */ 5366 for (i = 0; i < IDX_COUNT; i++) 5367 if ((cps[i])->flags & CP_NCP) 5368 (cps[i])->Open(sp); 5369 5370 /* Send Up events to all NCPs. */ 5371 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5372 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5373 (cps[i])->Up(sp); 5374 5375 /* if no NCP is starting, all this was in vain, close down */ 5376 sppp_lcp_check_and_close(sp); 5377 } 5378 5379 5380 static const char * 5381 sppp_cp_type_name(u_char type) 5382 { 5383 static char buf[12]; 5384 switch (type) { 5385 case CONF_REQ: return "conf-req"; 5386 case CONF_ACK: return "conf-ack"; 5387 case CONF_NAK: return "conf-nak"; 5388 case CONF_REJ: return "conf-rej"; 5389 case TERM_REQ: return "term-req"; 5390 case TERM_ACK: return "term-ack"; 5391 case CODE_REJ: return "code-rej"; 5392 case PROTO_REJ: return "proto-rej"; 5393 case ECHO_REQ: return "echo-req"; 5394 case ECHO_REPLY: return "echo-reply"; 5395 case DISC_REQ: return "discard-req"; 5396 } 5397 snprintf(buf, sizeof(buf), "0x%x", type); 5398 return buf; 5399 } 5400 5401 static const char * 5402 sppp_auth_type_name(u_short proto, u_char type) 5403 { 5404 static char buf[12]; 5405 switch (proto) { 5406 case PPP_CHAP: 5407 switch (type) { 5408 case CHAP_CHALLENGE: return "challenge"; 5409 case CHAP_RESPONSE: return "response"; 5410 case CHAP_SUCCESS: return "success"; 5411 case CHAP_FAILURE: return "failure"; 5412 } 5413 case PPP_PAP: 5414 switch (type) { 5415 case PAP_REQ: return "req"; 5416 case PAP_ACK: return "ack"; 5417 case PAP_NAK: return "nak"; 5418 } 5419 } 5420 snprintf(buf, sizeof(buf), "0x%x", type); 5421 return buf; 5422 } 5423 5424 static const char * 5425 sppp_lcp_opt_name(u_char opt) 5426 { 5427 static char buf[12]; 5428 switch (opt) { 5429 case LCP_OPT_MRU: return "mru"; 5430 case LCP_OPT_ASYNC_MAP: return "async-map"; 5431 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5432 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5433 case LCP_OPT_MAGIC: return "magic"; 5434 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5435 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5436 } 5437 snprintf(buf, sizeof(buf), "0x%x", opt); 5438 return buf; 5439 } 5440 5441 static const char * 5442 sppp_ipcp_opt_name(u_char opt) 5443 { 5444 static char buf[12]; 5445 switch (opt) { 5446 case IPCP_OPT_ADDRESSES: return "addresses"; 5447 case IPCP_OPT_COMPRESSION: return "compression"; 5448 case IPCP_OPT_ADDRESS: return "address"; 5449 } 5450 snprintf(buf, sizeof(buf), "0x%x", opt); 5451 return buf; 5452 } 5453 5454 #ifdef INET6 5455 static const char * 5456 sppp_ipv6cp_opt_name(u_char opt) 5457 { 5458 static char buf[12]; 5459 switch (opt) { 5460 case IPV6CP_OPT_IFID: return "ifid"; 5461 case IPV6CP_OPT_COMPRESSION: return "compression"; 5462 } 5463 snprintf(buf, sizeof(buf), "0x%x", opt); 5464 return buf; 5465 } 5466 #endif 5467 5468 static const char * 5469 sppp_state_name(int state) 5470 { 5471 switch (state) { 5472 case STATE_INITIAL: return "initial"; 5473 case STATE_STARTING: return "starting"; 5474 case STATE_CLOSED: return "closed"; 5475 case STATE_STOPPED: return "stopped"; 5476 case STATE_CLOSING: return "closing"; 5477 case STATE_STOPPING: return "stopping"; 5478 case STATE_REQ_SENT: return "req-sent"; 5479 case STATE_ACK_RCVD: return "ack-rcvd"; 5480 case STATE_ACK_SENT: return "ack-sent"; 5481 case STATE_OPENED: return "opened"; 5482 } 5483 return "illegal"; 5484 } 5485 5486 static const char * 5487 sppp_phase_name(int phase) 5488 { 5489 switch (phase) { 5490 case SPPP_PHASE_DEAD: return "dead"; 5491 case SPPP_PHASE_ESTABLISH: return "establish"; 5492 case SPPP_PHASE_TERMINATE: return "terminate"; 5493 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5494 case SPPP_PHASE_NETWORK: return "network"; 5495 } 5496 return "illegal"; 5497 } 5498 5499 static const char * 5500 sppp_proto_name(u_short proto) 5501 { 5502 static char buf[12]; 5503 switch (proto) { 5504 case PPP_LCP: return "lcp"; 5505 case PPP_IPCP: return "ipcp"; 5506 case PPP_PAP: return "pap"; 5507 case PPP_CHAP: return "chap"; 5508 case PPP_IPV6CP: return "ipv6cp"; 5509 } 5510 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5511 return buf; 5512 } 5513 5514 static void 5515 sppp_print_bytes(const u_char *p, u_short len) 5516 { 5517 addlog(" %02x", *p++); 5518 while (--len > 0) 5519 addlog("-%02x", *p++); 5520 } 5521 5522 static void 5523 sppp_print_string(const char *p, u_short len) 5524 { 5525 u_char c; 5526 5527 while (len-- > 0) { 5528 c = *p++; 5529 /* 5530 * Print only ASCII chars directly. RFC 1994 recommends 5531 * using only them, but we don't rely on it. */ 5532 if (c < ' ' || c > '~') 5533 addlog("\\x%x", c); 5534 else 5535 addlog("%c", c); 5536 } 5537 } 5538 5539 static const char * 5540 sppp_dotted_quad(uint32_t addr) 5541 { 5542 static char s[16]; 5543 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5544 (int)((addr >> 24) & 0xff), 5545 (int)((addr >> 16) & 0xff), 5546 (int)((addr >> 8) & 0xff), 5547 (int)(addr & 0xff)); 5548 return s; 5549 } 5550 5551 /* a dummy, used to drop uninteresting events */ 5552 static void 5553 sppp_null(struct sppp *unused) 5554 { 5555 /* do just nothing */ 5556 } 5557 /* 5558 * This file is large. Tell emacs to highlight it nevertheless. 5559 * 5560 * Local Variables: 5561 * hilit-auto-highlight-maxout: 120000 5562 * End: 5563 */ 5564
Indexes created Fri Sep 26 20:09:58 GMT 2025