if_spppsubr.c revision 1.125.6.1
1 /* $NetBSD: if_spppsubr.c,v 1.125.6.1 2013/06/23 06:20:25 tls Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions are met: 18 * 1. Redistributions of source code must retain the above copyright notice, 19 * this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright notice, 21 * this list of conditions and the following disclaimer in the documentation 22 * and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 * 36 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 37 * 38 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 39 * 40 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.125.6.1 2013/06/23 06:20:25 tls Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_pfil_hooks.h" 50 #include "opt_modular.h" 51 #include "opt_compat_netbsd.h" 52 #endif 53 54 55 #include <sys/param.h> 56 #include <sys/proc.h> 57 #include <sys/systm.h> 58 #include <sys/kernel.h> 59 #include <sys/sockio.h> 60 #include <sys/socket.h> 61 #include <sys/syslog.h> 62 #include <sys/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/callout.h> 65 #include <sys/md5.h> 66 #include <sys/inttypes.h> 67 #include <sys/kauth.h> 68 #include <sys/cprng.h> 69 70 #include <net/if.h> 71 #include <net/netisr.h> 72 #include <net/if_types.h> 73 #include <net/route.h> 74 #include <net/ppp_defs.h> 75 76 #include <netinet/in.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/in_var.h> 79 #ifdef INET 80 #include <netinet/ip.h> 81 #include <netinet/tcp.h> 82 #endif 83 #include <net/ethertypes.h> 84 85 #ifdef INET6 86 #include <netinet6/scope6_var.h> 87 #endif 88 89 #ifdef IPX 90 #include <netipx/ipx.h> 91 #include <netipx/ipx_if.h> 92 #endif 93 94 #include <net/if_sppp.h> 95 #include <net/if_spppvar.h> 96 97 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 98 #define LOOPALIVECNT 3 /* loopback detection tries */ 99 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 100 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 101 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 102 103 /* 104 * Interface flags that can be set in an ifconfig command. 105 * 106 * Setting link0 will make the link passive, i.e. it will be marked 107 * as being administrative openable, but won't be opened to begin 108 * with. Incoming calls will be answered, or subsequent calls with 109 * -link1 will cause the administrative open of the LCP layer. 110 * 111 * Setting link1 will cause the link to auto-dial only as packets 112 * arrive to be sent. 113 * 114 * Setting IFF_DEBUG will syslog the option negotiation and state 115 * transitions at level kern.debug. Note: all logs consistently look 116 * like 117 * 118 * <if-name><unit>: <proto-name> <additional info...> 119 * 120 * with <if-name><unit> being something like "bppp0", and <proto-name> 121 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 122 */ 123 124 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 125 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 126 127 #define CONF_REQ 1 /* PPP configure request */ 128 #define CONF_ACK 2 /* PPP configure acknowledge */ 129 #define CONF_NAK 3 /* PPP configure negative ack */ 130 #define CONF_REJ 4 /* PPP configure reject */ 131 #define TERM_REQ 5 /* PPP terminate request */ 132 #define TERM_ACK 6 /* PPP terminate acknowledge */ 133 #define CODE_REJ 7 /* PPP code reject */ 134 #define PROTO_REJ 8 /* PPP protocol reject */ 135 #define ECHO_REQ 9 /* PPP echo request */ 136 #define ECHO_REPLY 10 /* PPP echo reply */ 137 #define DISC_REQ 11 /* PPP discard request */ 138 139 #define LCP_OPT_MRU 1 /* maximum receive unit */ 140 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 141 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 142 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 143 #define LCP_OPT_MAGIC 5 /* magic number */ 144 #define LCP_OPT_RESERVED 6 /* reserved */ 145 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 146 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 147 148 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 149 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 150 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 151 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 152 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 153 154 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 155 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 156 157 #define PAP_REQ 1 /* PAP name/password request */ 158 #define PAP_ACK 2 /* PAP acknowledge */ 159 #define PAP_NAK 3 /* PAP fail */ 160 161 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 162 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 163 #define CHAP_SUCCESS 3 /* CHAP response ok */ 164 #define CHAP_FAILURE 4 /* CHAP response failed */ 165 166 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 167 168 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 169 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 170 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 171 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 172 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 173 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 174 175 /* states are named and numbered according to RFC 1661 */ 176 #define STATE_INITIAL 0 177 #define STATE_STARTING 1 178 #define STATE_CLOSED 2 179 #define STATE_STOPPED 3 180 #define STATE_CLOSING 4 181 #define STATE_STOPPING 5 182 #define STATE_REQ_SENT 6 183 #define STATE_ACK_RCVD 7 184 #define STATE_ACK_SENT 8 185 #define STATE_OPENED 9 186 187 struct ppp_header { 188 uint8_t address; 189 uint8_t control; 190 uint16_t protocol; 191 } __packed; 192 #define PPP_HEADER_LEN sizeof (struct ppp_header) 193 194 struct lcp_header { 195 uint8_t type; 196 uint8_t ident; 197 uint16_t len; 198 } __packed; 199 #define LCP_HEADER_LEN sizeof (struct lcp_header) 200 201 struct cisco_packet { 202 uint32_t type; 203 uint32_t par1; 204 uint32_t par2; 205 uint16_t rel; 206 uint16_t time0; 207 uint16_t time1; 208 } __packed; 209 #define CISCO_PACKET_LEN 18 210 211 /* 212 * We follow the spelling and capitalization of RFC 1661 here, to make 213 * it easier comparing with the standard. Please refer to this RFC in 214 * case you can't make sense out of these abbreviation; it will also 215 * explain the semantics related to the various events and actions. 216 */ 217 struct cp { 218 u_short proto; /* PPP control protocol number */ 219 u_char protoidx; /* index into state table in struct sppp */ 220 u_char flags; 221 #define CP_LCP 0x01 /* this is the LCP */ 222 #define CP_AUTH 0x02 /* this is an authentication protocol */ 223 #define CP_NCP 0x04 /* this is a NCP */ 224 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 225 const char *name; /* name of this control protocol */ 226 /* event handlers */ 227 void (*Up)(struct sppp *sp); 228 void (*Down)(struct sppp *sp); 229 void (*Open)(struct sppp *sp); 230 void (*Close)(struct sppp *sp); 231 void (*TO)(void *sp); 232 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 233 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 234 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 235 /* actions */ 236 void (*tlu)(struct sppp *sp); 237 void (*tld)(struct sppp *sp); 238 void (*tls)(struct sppp *sp); 239 void (*tlf)(struct sppp *sp); 240 void (*scr)(struct sppp *sp); 241 }; 242 243 static struct sppp *spppq; 244 static callout_t keepalive_ch; 245 246 #ifdef INET 247 /* 248 * The following disgusting hack gets around the problem that IP TOS 249 * can't be set yet. We want to put "interactive" traffic on a high 250 * priority queue. To decide if traffic is interactive, we check that 251 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 252 * 253 * XXX is this really still necessary? - joerg - 254 */ 255 static u_short interactive_ports[8] = { 256 0, 513, 0, 0, 257 0, 21, 0, 23, 258 }; 259 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 260 #endif 261 262 /* almost every function needs these */ 263 #define STDDCL \ 264 struct ifnet *ifp = &sp->pp_if; \ 265 int debug = ifp->if_flags & IFF_DEBUG 266 267 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 268 const struct sockaddr *dst, struct rtentry *rt); 269 270 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 271 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 272 273 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 274 struct mbuf *m); 275 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 276 u_char ident, u_short len, void *data); 277 /* static void sppp_cp_timeout(void *arg); */ 278 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 279 int newstate); 280 static void sppp_auth_send(const struct cp *cp, 281 struct sppp *sp, unsigned int type, unsigned int id, 282 ...); 283 284 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 285 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 286 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 288 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 289 290 static void sppp_null(struct sppp *sp); 291 292 static void sppp_lcp_init(struct sppp *sp); 293 static void sppp_lcp_up(struct sppp *sp); 294 static void sppp_lcp_down(struct sppp *sp); 295 static void sppp_lcp_open(struct sppp *sp); 296 static void sppp_lcp_close(struct sppp *sp); 297 static void sppp_lcp_TO(void *sp); 298 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 299 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 300 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 301 static void sppp_lcp_tlu(struct sppp *sp); 302 static void sppp_lcp_tld(struct sppp *sp); 303 static void sppp_lcp_tls(struct sppp *sp); 304 static void sppp_lcp_tlf(struct sppp *sp); 305 static void sppp_lcp_scr(struct sppp *sp); 306 static void sppp_lcp_check_and_close(struct sppp *sp); 307 static int sppp_ncp_check(struct sppp *sp); 308 309 static void sppp_ipcp_init(struct sppp *sp); 310 static void sppp_ipcp_up(struct sppp *sp); 311 static void sppp_ipcp_down(struct sppp *sp); 312 static void sppp_ipcp_open(struct sppp *sp); 313 static void sppp_ipcp_close(struct sppp *sp); 314 static void sppp_ipcp_TO(void *sp); 315 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 316 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 317 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 318 static void sppp_ipcp_tlu(struct sppp *sp); 319 static void sppp_ipcp_tld(struct sppp *sp); 320 static void sppp_ipcp_tls(struct sppp *sp); 321 static void sppp_ipcp_tlf(struct sppp *sp); 322 static void sppp_ipcp_scr(struct sppp *sp); 323 324 static void sppp_ipv6cp_init(struct sppp *sp); 325 static void sppp_ipv6cp_up(struct sppp *sp); 326 static void sppp_ipv6cp_down(struct sppp *sp); 327 static void sppp_ipv6cp_open(struct sppp *sp); 328 static void sppp_ipv6cp_close(struct sppp *sp); 329 static void sppp_ipv6cp_TO(void *sp); 330 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 332 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 333 static void sppp_ipv6cp_tlu(struct sppp *sp); 334 static void sppp_ipv6cp_tld(struct sppp *sp); 335 static void sppp_ipv6cp_tls(struct sppp *sp); 336 static void sppp_ipv6cp_tlf(struct sppp *sp); 337 static void sppp_ipv6cp_scr(struct sppp *sp); 338 339 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 340 static void sppp_pap_init(struct sppp *sp); 341 static void sppp_pap_open(struct sppp *sp); 342 static void sppp_pap_close(struct sppp *sp); 343 static void sppp_pap_TO(void *sp); 344 static void sppp_pap_my_TO(void *sp); 345 static void sppp_pap_tlu(struct sppp *sp); 346 static void sppp_pap_tld(struct sppp *sp); 347 static void sppp_pap_scr(struct sppp *sp); 348 349 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 350 static void sppp_chap_init(struct sppp *sp); 351 static void sppp_chap_open(struct sppp *sp); 352 static void sppp_chap_close(struct sppp *sp); 353 static void sppp_chap_TO(void *sp); 354 static void sppp_chap_tlu(struct sppp *sp); 355 static void sppp_chap_tld(struct sppp *sp); 356 static void sppp_chap_scr(struct sppp *sp); 357 358 static const char *sppp_auth_type_name(u_short proto, u_char type); 359 static const char *sppp_cp_type_name(u_char type); 360 static const char *sppp_dotted_quad(uint32_t addr); 361 static const char *sppp_ipcp_opt_name(u_char opt); 362 #ifdef INET6 363 static const char *sppp_ipv6cp_opt_name(u_char opt); 364 #endif 365 static const char *sppp_lcp_opt_name(u_char opt); 366 static const char *sppp_phase_name(int phase); 367 static const char *sppp_proto_name(u_short proto); 368 static const char *sppp_state_name(int state); 369 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 370 #ifdef INET 371 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 372 uint32_t *srcmask); 373 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 374 static void sppp_clear_ip_addrs(struct sppp *sp); 375 #endif 376 static void sppp_keepalive(void *dummy); 377 static void sppp_phase_network(struct sppp *sp); 378 static void sppp_print_bytes(const u_char *p, u_short len); 379 static void sppp_print_string(const char *p, u_short len); 380 #ifdef INET6 381 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 382 struct in6_addr *dst, struct in6_addr *srcmask); 383 #ifdef IPV6CP_MYIFID_DYN 384 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 386 #endif 387 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 388 #endif 389 390 /* our control protocol descriptors */ 391 static const struct cp lcp = { 392 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 393 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 394 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 395 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 396 sppp_lcp_scr 397 }; 398 399 static const struct cp ipcp = { 400 PPP_IPCP, IDX_IPCP, 401 #ifdef INET 402 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 403 #else 404 0, 405 #endif 406 "ipcp", 407 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 408 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 409 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 410 sppp_ipcp_scr 411 }; 412 413 static const struct cp ipv6cp = { 414 PPP_IPV6CP, IDX_IPV6CP, 415 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 416 CP_NCP, 417 #else 418 0, 419 #endif 420 "ipv6cp", 421 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 422 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 423 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 424 sppp_ipv6cp_scr 425 }; 426 427 static const struct cp pap = { 428 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 429 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 430 sppp_pap_TO, 0, 0, 0, 431 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 432 sppp_pap_scr 433 }; 434 435 static const struct cp chap = { 436 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 437 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 438 sppp_chap_TO, 0, 0, 0, 439 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 440 sppp_chap_scr 441 }; 442 443 static const struct cp *cps[IDX_COUNT] = { 444 &lcp, /* IDX_LCP */ 445 &ipcp, /* IDX_IPCP */ 446 &ipv6cp, /* IDX_IPV6CP */ 447 &pap, /* IDX_PAP */ 448 &chap, /* IDX_CHAP */ 449 }; 450 451 452 void spppattach(int); 453 void 454 /*ARGSUSED*/ 455 spppattach(int count) 456 { 457 } 458 459 /* 460 * Exported functions, comprising our interface to the lower layer. 461 */ 462 463 /* 464 * Process the received packet. 465 */ 466 void 467 sppp_input(struct ifnet *ifp, struct mbuf *m) 468 { 469 struct ppp_header *h = NULL; 470 struct ifqueue *inq = 0; 471 uint16_t protocol; 472 int s; 473 struct sppp *sp = (struct sppp *)ifp; 474 int debug = ifp->if_flags & IFF_DEBUG; 475 476 if (ifp->if_flags & IFF_UP) { 477 /* Count received bytes, add hardware framing */ 478 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 479 /* Note time of last receive */ 480 sp->pp_last_receive = time_uptime; 481 } 482 483 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 484 /* Too small packet, drop it. */ 485 if (debug) 486 log(LOG_DEBUG, 487 "%s: input packet is too small, %d bytes\n", 488 ifp->if_xname, m->m_pkthdr.len); 489 drop: 490 ++ifp->if_ierrors; 491 ++ifp->if_iqdrops; 492 m_freem(m); 493 return; 494 } 495 496 if (sp->pp_flags & PP_NOFRAMING) { 497 memcpy(&protocol, mtod(m, void *), 2); 498 protocol = ntohs(protocol); 499 m_adj(m, 2); 500 } else { 501 502 /* Get PPP header. */ 503 h = mtod(m, struct ppp_header *); 504 m_adj(m, PPP_HEADER_LEN); 505 506 switch (h->address) { 507 case PPP_ALLSTATIONS: 508 if (h->control != PPP_UI) 509 goto invalid; 510 if (sp->pp_flags & PP_CISCO) { 511 if (debug) 512 log(LOG_DEBUG, 513 "%s: PPP packet in Cisco mode " 514 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 515 ifp->if_xname, 516 h->address, h->control, ntohs(h->protocol)); 517 goto drop; 518 } 519 break; 520 case CISCO_MULTICAST: 521 case CISCO_UNICAST: 522 /* Don't check the control field here (RFC 1547). */ 523 if (! (sp->pp_flags & PP_CISCO)) { 524 if (debug) 525 log(LOG_DEBUG, 526 "%s: Cisco packet in PPP mode " 527 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 528 ifp->if_xname, 529 h->address, h->control, ntohs(h->protocol)); 530 goto drop; 531 } 532 switch (ntohs(h->protocol)) { 533 default: 534 ++ifp->if_noproto; 535 goto invalid; 536 case CISCO_KEEPALIVE: 537 sppp_cisco_input((struct sppp *) ifp, m); 538 m_freem(m); 539 return; 540 #ifdef INET 541 case ETHERTYPE_IP: 542 schednetisr(NETISR_IP); 543 inq = &ipintrq; 544 break; 545 #endif 546 #ifdef INET6 547 case ETHERTYPE_IPV6: 548 schednetisr(NETISR_IPV6); 549 inq = &ip6intrq; 550 break; 551 #endif 552 #ifdef IPX 553 case ETHERTYPE_IPX: 554 schednetisr(NETISR_IPX); 555 inq = &ipxintrq; 556 break; 557 #endif 558 } 559 goto queue_pkt; 560 default: /* Invalid PPP packet. */ 561 invalid: 562 if (debug) 563 log(LOG_DEBUG, 564 "%s: invalid input packet " 565 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 566 ifp->if_xname, 567 h->address, h->control, ntohs(h->protocol)); 568 goto drop; 569 } 570 protocol = ntohs(h->protocol); 571 } 572 573 switch (protocol) { 574 default: 575 if (sp->state[IDX_LCP] == STATE_OPENED) { 576 uint16_t prot = htons(protocol); 577 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 578 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 579 &prot); 580 } 581 if (debug) 582 log(LOG_DEBUG, 583 "%s: invalid input protocol " 584 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 585 ++ifp->if_noproto; 586 goto drop; 587 case PPP_LCP: 588 sppp_cp_input(&lcp, sp, m); 589 m_freem(m); 590 return; 591 case PPP_PAP: 592 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 593 sppp_pap_input(sp, m); 594 m_freem(m); 595 return; 596 case PPP_CHAP: 597 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 598 sppp_chap_input(sp, m); 599 m_freem(m); 600 return; 601 #ifdef INET 602 case PPP_IPCP: 603 if (sp->pp_phase == SPPP_PHASE_NETWORK) 604 sppp_cp_input(&ipcp, sp, m); 605 m_freem(m); 606 return; 607 case PPP_IP: 608 if (sp->state[IDX_IPCP] == STATE_OPENED) { 609 schednetisr(NETISR_IP); 610 inq = &ipintrq; 611 sp->pp_last_activity = time_uptime; 612 } 613 break; 614 #endif 615 #ifdef INET6 616 case PPP_IPV6CP: 617 if (sp->pp_phase == SPPP_PHASE_NETWORK) 618 sppp_cp_input(&ipv6cp, sp, m); 619 m_freem(m); 620 return; 621 622 case PPP_IPV6: 623 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 624 schednetisr(NETISR_IPV6); 625 inq = &ip6intrq; 626 sp->pp_last_activity = time_uptime; 627 } 628 break; 629 #endif 630 #ifdef IPX 631 case PPP_IPX: 632 /* IPX IPXCP not implemented yet */ 633 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 634 schednetisr(NETISR_IPX); 635 inq = &ipxintrq; 636 } 637 break; 638 #endif 639 } 640 641 queue_pkt: 642 if (! (ifp->if_flags & IFF_UP) || ! inq) 643 goto drop; 644 645 /* Check queue. */ 646 s = splnet(); 647 if (IF_QFULL(inq)) { 648 /* Queue overflow. */ 649 IF_DROP(inq); 650 splx(s); 651 if (debug) 652 log(LOG_DEBUG, "%s: protocol queue overflow\n", 653 ifp->if_xname); 654 goto drop; 655 } 656 IF_ENQUEUE(inq, m); 657 splx(s); 658 } 659 660 /* 661 * Enqueue transmit packet. 662 */ 663 static int 664 sppp_output(struct ifnet *ifp, struct mbuf *m, 665 const struct sockaddr *dst, struct rtentry *rt) 666 { 667 struct sppp *sp = (struct sppp *) ifp; 668 struct ppp_header *h = NULL; 669 struct ifqueue *ifq = NULL; /* XXX */ 670 int s, error = 0; 671 uint16_t protocol; 672 ALTQ_DECL(struct altq_pktattr pktattr;) 673 674 s = splnet(); 675 676 sp->pp_last_activity = time_uptime; 677 678 if ((ifp->if_flags & IFF_UP) == 0 || 679 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 680 m_freem(m); 681 splx(s); 682 return (ENETDOWN); 683 } 684 685 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 686 /* 687 * Interface is not yet running, but auto-dial. Need 688 * to start LCP for it. 689 */ 690 ifp->if_flags |= IFF_RUNNING; 691 splx(s); 692 lcp.Open(sp); 693 s = splnet(); 694 } 695 696 /* 697 * If the queueing discipline needs packet classification, 698 * do it before prepending link headers. 699 */ 700 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 701 702 #ifdef INET 703 if (dst->sa_family == AF_INET) { 704 struct ip *ip = NULL; 705 struct tcphdr *th = NULL; 706 707 if (m->m_len >= sizeof(struct ip)) { 708 ip = mtod(m, struct ip *); 709 if (ip->ip_p == IPPROTO_TCP && 710 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 711 sizeof(struct tcphdr)) { 712 th = (struct tcphdr *) 713 ((char *)ip + (ip->ip_hl << 2)); 714 } 715 } else 716 ip = NULL; 717 718 /* 719 * When using dynamic local IP address assignment by using 720 * 0.0.0.0 as a local address, the first TCP session will 721 * not connect because the local TCP checksum is computed 722 * using 0.0.0.0 which will later become our real IP address 723 * so the TCP checksum computed at the remote end will 724 * become invalid. So we 725 * - don't let packets with src ip addr 0 thru 726 * - we flag TCP packets with src ip 0 as an error 727 */ 728 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 729 uint8_t proto = ip->ip_p; 730 731 m_freem(m); 732 splx(s); 733 if (proto == IPPROTO_TCP) 734 return (EADDRNOTAVAIL); 735 else 736 return (0); 737 } 738 739 /* 740 * Put low delay, telnet, rlogin and ftp control packets 741 * in front of the queue. 742 */ 743 744 if (!IF_QFULL(&sp->pp_fastq) && 745 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 746 (th && (INTERACTIVE(ntohs(th->th_sport)) || 747 INTERACTIVE(ntohs(th->th_dport)))))) 748 ifq = &sp->pp_fastq; 749 } 750 #endif 751 752 #ifdef INET6 753 if (dst->sa_family == AF_INET6) { 754 /* XXX do something tricky here? */ 755 } 756 #endif 757 758 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 759 /* 760 * Prepend general data packet PPP header. For now, IP only. 761 */ 762 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 763 if (! m) { 764 if (ifp->if_flags & IFF_DEBUG) 765 log(LOG_DEBUG, "%s: no memory for transmit header\n", 766 ifp->if_xname); 767 ++ifp->if_oerrors; 768 splx(s); 769 return (ENOBUFS); 770 } 771 /* 772 * May want to check size of packet 773 * (albeit due to the implementation it's always enough) 774 */ 775 h = mtod(m, struct ppp_header *); 776 if (sp->pp_flags & PP_CISCO) { 777 h->address = CISCO_UNICAST; /* unicast address */ 778 h->control = 0; 779 } else { 780 h->address = PPP_ALLSTATIONS; /* broadcast address */ 781 h->control = PPP_UI; /* Unnumbered Info */ 782 } 783 } 784 785 switch (dst->sa_family) { 786 #ifdef INET 787 case AF_INET: /* Internet Protocol */ 788 if (sp->pp_flags & PP_CISCO) 789 protocol = htons(ETHERTYPE_IP); 790 else { 791 /* 792 * Don't choke with an ENETDOWN early. It's 793 * possible that we just started dialing out, 794 * so don't drop the packet immediately. If 795 * we notice that we run out of buffer space 796 * below, we will however remember that we are 797 * not ready to carry IP packets, and return 798 * ENETDOWN, as opposed to ENOBUFS. 799 */ 800 protocol = htons(PPP_IP); 801 if (sp->state[IDX_IPCP] != STATE_OPENED) 802 error = ENETDOWN; 803 } 804 break; 805 #endif 806 #ifdef INET6 807 case AF_INET6: /* Internet Protocol version 6 */ 808 if (sp->pp_flags & PP_CISCO) 809 protocol = htons(ETHERTYPE_IPV6); 810 else { 811 /* 812 * Don't choke with an ENETDOWN early. It's 813 * possible that we just started dialing out, 814 * so don't drop the packet immediately. If 815 * we notice that we run out of buffer space 816 * below, we will however remember that we are 817 * not ready to carry IP packets, and return 818 * ENETDOWN, as opposed to ENOBUFS. 819 */ 820 protocol = htons(PPP_IPV6); 821 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 822 error = ENETDOWN; 823 } 824 break; 825 #endif 826 #ifdef IPX 827 case AF_IPX: /* Novell IPX Protocol */ 828 protocol = htons((sp->pp_flags & PP_CISCO) ? 829 ETHERTYPE_IPX : PPP_IPX); 830 break; 831 #endif 832 default: 833 m_freem(m); 834 ++ifp->if_oerrors; 835 splx(s); 836 return (EAFNOSUPPORT); 837 } 838 839 if (sp->pp_flags & PP_NOFRAMING) { 840 M_PREPEND(m, 2, M_DONTWAIT); 841 if (m == NULL) { 842 if (ifp->if_flags & IFF_DEBUG) 843 log(LOG_DEBUG, "%s: no memory for transmit header\n", 844 ifp->if_xname); 845 ++ifp->if_oerrors; 846 splx(s); 847 return (ENOBUFS); 848 } 849 *mtod(m, uint16_t *) = protocol; 850 } else { 851 h->protocol = protocol; 852 } 853 854 855 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 856 857 if (error == 0) { 858 /* 859 * Count output packets and bytes. 860 * The packet length includes header + additional hardware 861 * framing according to RFC 1333. 862 */ 863 if (!(ifp->if_flags & IFF_OACTIVE)) 864 (*ifp->if_start)(ifp); 865 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 866 } 867 splx(s); 868 return error; 869 } 870 871 void 872 sppp_attach(struct ifnet *ifp) 873 { 874 struct sppp *sp = (struct sppp *) ifp; 875 876 /* Initialize keepalive handler. */ 877 if (! spppq) { 878 callout_init(&keepalive_ch, 0); 879 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 880 } 881 882 /* Insert new entry into the keepalive list. */ 883 sp->pp_next = spppq; 884 spppq = sp; 885 886 sp->pp_if.if_type = IFT_PPP; 887 sp->pp_if.if_output = sppp_output; 888 sp->pp_fastq.ifq_maxlen = 32; 889 sp->pp_cpq.ifq_maxlen = 20; 890 sp->pp_loopcnt = 0; 891 sp->pp_alivecnt = 0; 892 sp->pp_last_activity = 0; 893 sp->pp_last_receive = 0; 894 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 895 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 896 sp->pp_idle_timeout = 0; 897 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 898 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 899 sp->pp_auth_failures = 0; 900 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 901 sp->pp_phase = SPPP_PHASE_DEAD; 902 sp->pp_up = lcp.Up; 903 sp->pp_down = lcp.Down; 904 905 if_alloc_sadl(ifp); 906 907 memset(&sp->myauth, 0, sizeof sp->myauth); 908 memset(&sp->hisauth, 0, sizeof sp->hisauth); 909 sppp_lcp_init(sp); 910 sppp_ipcp_init(sp); 911 sppp_ipv6cp_init(sp); 912 sppp_pap_init(sp); 913 sppp_chap_init(sp); 914 } 915 916 void 917 sppp_detach(struct ifnet *ifp) 918 { 919 struct sppp **q, *p, *sp = (struct sppp *) ifp; 920 921 /* Remove the entry from the keepalive list. */ 922 for (q = &spppq; (p = *q); q = &p->pp_next) 923 if (p == sp) { 924 *q = p->pp_next; 925 break; 926 } 927 928 /* Stop keepalive handler. */ 929 if (! spppq) { 930 callout_stop(&keepalive_ch); 931 } 932 933 callout_stop(&sp->ch[IDX_LCP]); 934 callout_stop(&sp->ch[IDX_IPCP]); 935 callout_stop(&sp->ch[IDX_PAP]); 936 callout_stop(&sp->ch[IDX_CHAP]); 937 #ifdef INET6 938 callout_stop(&sp->ch[IDX_IPV6CP]); 939 #endif 940 callout_stop(&sp->pap_my_to_ch); 941 942 /* free authentication info */ 943 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 944 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 945 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 946 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 947 948 #if 0 /* done in if_detach() */ 949 if_free_sadl(ifp); 950 #endif 951 } 952 953 /* 954 * Flush the interface output queue. 955 */ 956 void 957 sppp_flush(struct ifnet *ifp) 958 { 959 struct sppp *sp = (struct sppp *) ifp; 960 961 IFQ_PURGE(&sp->pp_if.if_snd); 962 IF_PURGE(&sp->pp_fastq); 963 IF_PURGE(&sp->pp_cpq); 964 } 965 966 /* 967 * Check if the output queue is empty. 968 */ 969 int 970 sppp_isempty(struct ifnet *ifp) 971 { 972 struct sppp *sp = (struct sppp *) ifp; 973 int empty, s; 974 975 s = splnet(); 976 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 977 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 978 splx(s); 979 return (empty); 980 } 981 982 /* 983 * Get next packet to send. 984 */ 985 struct mbuf * 986 sppp_dequeue(struct ifnet *ifp) 987 { 988 struct sppp *sp = (struct sppp *) ifp; 989 struct mbuf *m; 990 int s; 991 992 s = splnet(); 993 /* 994 * Process only the control protocol queue until we have at 995 * least one NCP open. 996 * 997 * Do always serve all three queues in Cisco mode. 998 */ 999 IF_DEQUEUE(&sp->pp_cpq, m); 1000 if (m == NULL && 1001 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1002 IF_DEQUEUE(&sp->pp_fastq, m); 1003 if (m == NULL) 1004 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1005 } 1006 splx(s); 1007 return m; 1008 } 1009 1010 /* 1011 * Process an ioctl request. Called on low priority level. 1012 */ 1013 int 1014 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1015 { 1016 struct lwp *l = curlwp; /* XXX */ 1017 struct ifreq *ifr = (struct ifreq *) data; 1018 struct sppp *sp = (struct sppp *) ifp; 1019 int s, error=0, going_up, going_down, newmode; 1020 1021 s = splnet(); 1022 switch (cmd) { 1023 case SIOCINITIFADDR: 1024 break; 1025 1026 case SIOCSIFFLAGS: 1027 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1028 break; 1029 going_up = ifp->if_flags & IFF_UP && 1030 (ifp->if_flags & IFF_RUNNING) == 0; 1031 going_down = (ifp->if_flags & IFF_UP) == 0 && 1032 ifp->if_flags & IFF_RUNNING; 1033 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1034 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1035 /* sanity */ 1036 newmode = IFF_PASSIVE; 1037 ifp->if_flags &= ~IFF_AUTO; 1038 } 1039 1040 if (going_up || going_down) 1041 lcp.Close(sp); 1042 if (going_up && newmode == 0) { 1043 /* neither auto-dial nor passive */ 1044 ifp->if_flags |= IFF_RUNNING; 1045 if (!(sp->pp_flags & PP_CISCO)) 1046 lcp.Open(sp); 1047 } else if (going_down) { 1048 sppp_flush(ifp); 1049 ifp->if_flags &= ~IFF_RUNNING; 1050 } 1051 1052 break; 1053 1054 case SIOCSIFMTU: 1055 if (ifr->ifr_mtu < PPP_MINMRU || 1056 ifr->ifr_mtu > sp->lcp.their_mru) { 1057 error = EINVAL; 1058 break; 1059 } 1060 /*FALLTHROUGH*/ 1061 case SIOCGIFMTU: 1062 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1063 error = 0; 1064 break; 1065 case SIOCADDMULTI: 1066 case SIOCDELMULTI: 1067 break; 1068 1069 case SPPPSETAUTHCFG: 1070 case SPPPSETLCPCFG: 1071 case SPPPSETIDLETO: 1072 case SPPPSETAUTHFAILURE: 1073 case SPPPSETDNSOPTS: 1074 case SPPPSETKEEPALIVE: 1075 #if defined(COMPAT_50) || defined(MODULAR) 1076 case __SPPPSETIDLETO50: 1077 case __SPPPSETKEEPALIVE50: 1078 #endif /* COMPAT_50 || MODULAR */ 1079 error = kauth_authorize_network(l->l_cred, 1080 KAUTH_NETWORK_INTERFACE, 1081 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1082 NULL); 1083 if (error) 1084 break; 1085 error = sppp_params(sp, cmd, data); 1086 break; 1087 1088 case SPPPGETAUTHCFG: 1089 case SPPPGETLCPCFG: 1090 case SPPPGETAUTHFAILURES: 1091 error = kauth_authorize_network(l->l_cred, 1092 KAUTH_NETWORK_INTERFACE, 1093 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1094 NULL); 1095 if (error) 1096 break; 1097 error = sppp_params(sp, cmd, data); 1098 break; 1099 1100 case SPPPGETSTATUS: 1101 case SPPPGETSTATUSNCP: 1102 case SPPPGETIDLETO: 1103 case SPPPGETDNSOPTS: 1104 case SPPPGETDNSADDRS: 1105 case SPPPGETKEEPALIVE: 1106 #if defined(COMPAT_50) || defined(MODULAR) 1107 case __SPPPGETIDLETO50: 1108 case __SPPPGETKEEPALIVE50: 1109 #endif /* COMPAT_50 || MODULAR */ 1110 error = sppp_params(sp, cmd, data); 1111 break; 1112 1113 default: 1114 error = ifioctl_common(ifp, cmd, data); 1115 break; 1116 } 1117 splx(s); 1118 return (error); 1119 } 1120 1121 1122 /* 1123 * Cisco framing implementation. 1124 */ 1125 1126 /* 1127 * Handle incoming Cisco keepalive protocol packets. 1128 */ 1129 static void 1130 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1131 { 1132 STDDCL; 1133 struct cisco_packet *h; 1134 #ifdef INET 1135 uint32_t me, mymask = 0; /* XXX: GCC */ 1136 #endif 1137 1138 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1139 if (debug) 1140 log(LOG_DEBUG, 1141 "%s: cisco invalid packet length: %d bytes\n", 1142 ifp->if_xname, m->m_pkthdr.len); 1143 return; 1144 } 1145 h = mtod(m, struct cisco_packet *); 1146 if (debug) 1147 log(LOG_DEBUG, 1148 "%s: cisco input: %d bytes " 1149 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1150 ifp->if_xname, m->m_pkthdr.len, 1151 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1152 (u_int)h->time0, (u_int)h->time1); 1153 switch (ntohl(h->type)) { 1154 default: 1155 if (debug) 1156 addlog("%s: cisco unknown packet type: 0x%x\n", 1157 ifp->if_xname, ntohl(h->type)); 1158 break; 1159 case CISCO_ADDR_REPLY: 1160 /* Reply on address request, ignore */ 1161 break; 1162 case CISCO_KEEPALIVE_REQ: 1163 sp->pp_alivecnt = 0; 1164 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1165 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1166 /* Local and remote sequence numbers are equal. 1167 * Probably, the line is in loopback mode. */ 1168 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1169 printf ("%s: loopback\n", 1170 ifp->if_xname); 1171 sp->pp_loopcnt = 0; 1172 if (ifp->if_flags & IFF_UP) { 1173 if_down(ifp); 1174 IF_PURGE(&sp->pp_cpq); 1175 } 1176 } 1177 ++sp->pp_loopcnt; 1178 1179 /* Generate new local sequence number */ 1180 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1181 break; 1182 } 1183 sp->pp_loopcnt = 0; 1184 if (! (ifp->if_flags & IFF_UP) && 1185 (ifp->if_flags & IFF_RUNNING)) { 1186 if_up(ifp); 1187 } 1188 break; 1189 case CISCO_ADDR_REQ: 1190 #ifdef INET 1191 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1192 if (me != 0L) 1193 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1194 #endif 1195 break; 1196 } 1197 } 1198 1199 /* 1200 * Send Cisco keepalive packet. 1201 */ 1202 static void 1203 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1204 { 1205 STDDCL; 1206 struct ppp_header *h; 1207 struct cisco_packet *ch; 1208 struct mbuf *m; 1209 uint32_t t; 1210 1211 t = time_uptime * 1000; 1212 MGETHDR(m, M_DONTWAIT, MT_DATA); 1213 if (! m) 1214 return; 1215 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1216 m->m_pkthdr.rcvif = 0; 1217 1218 h = mtod(m, struct ppp_header *); 1219 h->address = CISCO_MULTICAST; 1220 h->control = 0; 1221 h->protocol = htons(CISCO_KEEPALIVE); 1222 1223 ch = (struct cisco_packet *)(h + 1); 1224 ch->type = htonl(type); 1225 ch->par1 = htonl(par1); 1226 ch->par2 = htonl(par2); 1227 ch->rel = -1; 1228 1229 ch->time0 = htons((u_short)(t >> 16)); 1230 ch->time1 = htons((u_short) t); 1231 1232 if (debug) 1233 log(LOG_DEBUG, 1234 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1235 ifp->if_xname, ntohl(ch->type), ch->par1, 1236 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1237 (u_int)ch->time1); 1238 1239 if (IF_QFULL(&sp->pp_cpq)) { 1240 IF_DROP(&sp->pp_fastq); 1241 IF_DROP(&ifp->if_snd); 1242 m_freem(m); 1243 ++ifp->if_oerrors; 1244 return; 1245 } else 1246 IF_ENQUEUE(&sp->pp_cpq, m); 1247 if (! (ifp->if_flags & IFF_OACTIVE)) 1248 (*ifp->if_start)(ifp); 1249 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1250 } 1251 1252 /* 1253 * PPP protocol implementation. 1254 */ 1255 1256 /* 1257 * Send PPP control protocol packet. 1258 */ 1259 static void 1260 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1261 u_char ident, u_short len, void *data) 1262 { 1263 STDDCL; 1264 struct lcp_header *lh; 1265 struct mbuf *m; 1266 size_t pkthdrlen; 1267 1268 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1269 1270 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1271 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1272 MGETHDR(m, M_DONTWAIT, MT_DATA); 1273 if (! m) 1274 return; 1275 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1276 m->m_pkthdr.rcvif = 0; 1277 1278 if (sp->pp_flags & PP_NOFRAMING) { 1279 *mtod(m, uint16_t *) = htons(proto); 1280 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1281 } else { 1282 struct ppp_header *h; 1283 h = mtod(m, struct ppp_header *); 1284 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1285 h->control = PPP_UI; /* Unnumbered Info */ 1286 h->protocol = htons(proto); /* Link Control Protocol */ 1287 lh = (struct lcp_header *)(h + 1); 1288 } 1289 lh->type = type; 1290 lh->ident = ident; 1291 lh->len = htons(LCP_HEADER_LEN + len); 1292 if (len) 1293 bcopy (data, lh + 1, len); 1294 1295 if (debug) { 1296 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1297 ifp->if_xname, 1298 sppp_proto_name(proto), 1299 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1300 if (len) 1301 sppp_print_bytes((u_char *)(lh + 1), len); 1302 addlog(">\n"); 1303 } 1304 if (IF_QFULL(&sp->pp_cpq)) { 1305 IF_DROP(&sp->pp_fastq); 1306 IF_DROP(&ifp->if_snd); 1307 m_freem(m); 1308 ++ifp->if_oerrors; 1309 return; 1310 } else 1311 IF_ENQUEUE(&sp->pp_cpq, m); 1312 if (! (ifp->if_flags & IFF_OACTIVE)) 1313 (*ifp->if_start)(ifp); 1314 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1315 } 1316 1317 /* 1318 * Handle incoming PPP control protocol packets. 1319 */ 1320 static void 1321 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1322 { 1323 STDDCL; 1324 struct lcp_header *h; 1325 int printlen, len = m->m_pkthdr.len; 1326 int rv; 1327 u_char *p; 1328 uint32_t u32; 1329 1330 if (len < 4) { 1331 if (debug) 1332 log(LOG_DEBUG, 1333 "%s: %s invalid packet length: %d bytes\n", 1334 ifp->if_xname, cp->name, len); 1335 return; 1336 } 1337 h = mtod(m, struct lcp_header *); 1338 if (debug) { 1339 printlen = ntohs(h->len); 1340 log(LOG_DEBUG, 1341 "%s: %s input(%s): <%s id=0x%x len=%d", 1342 ifp->if_xname, cp->name, 1343 sppp_state_name(sp->state[cp->protoidx]), 1344 sppp_cp_type_name(h->type), h->ident, printlen); 1345 if (len < printlen) 1346 printlen = len; 1347 if (printlen > 4) 1348 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1349 addlog(">\n"); 1350 } 1351 if (len > ntohs(h->len)) 1352 len = ntohs(h->len); 1353 p = (u_char *)(h + 1); 1354 switch (h->type) { 1355 case CONF_REQ: 1356 if (len < 4) { 1357 if (debug) 1358 addlog("%s: %s invalid conf-req length %d\n", 1359 ifp->if_xname, cp->name, 1360 len); 1361 ++ifp->if_ierrors; 1362 break; 1363 } 1364 /* handle states where RCR doesn't get a SCA/SCN */ 1365 switch (sp->state[cp->protoidx]) { 1366 case STATE_CLOSING: 1367 case STATE_STOPPING: 1368 return; 1369 case STATE_CLOSED: 1370 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1371 0, 0); 1372 return; 1373 } 1374 rv = (cp->RCR)(sp, h, len); 1375 if (rv < 0) { 1376 /* fatal error, shut down */ 1377 (cp->tld)(sp); 1378 sppp_lcp_tlf(sp); 1379 return; 1380 } 1381 switch (sp->state[cp->protoidx]) { 1382 case STATE_OPENED: 1383 (cp->tld)(sp); 1384 (cp->scr)(sp); 1385 /* fall through... */ 1386 case STATE_ACK_SENT: 1387 case STATE_REQ_SENT: 1388 sppp_cp_change_state(cp, sp, rv? 1389 STATE_ACK_SENT: STATE_REQ_SENT); 1390 break; 1391 case STATE_STOPPED: 1392 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1393 (cp->scr)(sp); 1394 sppp_cp_change_state(cp, sp, rv? 1395 STATE_ACK_SENT: STATE_REQ_SENT); 1396 break; 1397 case STATE_ACK_RCVD: 1398 if (rv) { 1399 sppp_cp_change_state(cp, sp, STATE_OPENED); 1400 if (debug) 1401 log(LOG_DEBUG, "%s: %s tlu\n", 1402 ifp->if_xname, 1403 cp->name); 1404 (cp->tlu)(sp); 1405 } else 1406 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1407 break; 1408 default: 1409 printf("%s: %s illegal %s in state %s\n", 1410 ifp->if_xname, cp->name, 1411 sppp_cp_type_name(h->type), 1412 sppp_state_name(sp->state[cp->protoidx])); 1413 ++ifp->if_ierrors; 1414 } 1415 break; 1416 case CONF_ACK: 1417 if (h->ident != sp->confid[cp->protoidx]) { 1418 if (debug) 1419 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1420 ifp->if_xname, cp->name, 1421 h->ident, sp->confid[cp->protoidx]); 1422 ++ifp->if_ierrors; 1423 break; 1424 } 1425 switch (sp->state[cp->protoidx]) { 1426 case STATE_CLOSED: 1427 case STATE_STOPPED: 1428 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1429 break; 1430 case STATE_CLOSING: 1431 case STATE_STOPPING: 1432 break; 1433 case STATE_REQ_SENT: 1434 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1435 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1436 break; 1437 case STATE_OPENED: 1438 (cp->tld)(sp); 1439 /* fall through */ 1440 case STATE_ACK_RCVD: 1441 (cp->scr)(sp); 1442 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1443 break; 1444 case STATE_ACK_SENT: 1445 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1446 sppp_cp_change_state(cp, sp, STATE_OPENED); 1447 if (debug) 1448 log(LOG_DEBUG, "%s: %s tlu\n", 1449 ifp->if_xname, cp->name); 1450 (cp->tlu)(sp); 1451 break; 1452 default: 1453 printf("%s: %s illegal %s in state %s\n", 1454 ifp->if_xname, cp->name, 1455 sppp_cp_type_name(h->type), 1456 sppp_state_name(sp->state[cp->protoidx])); 1457 ++ifp->if_ierrors; 1458 } 1459 break; 1460 case CONF_NAK: 1461 case CONF_REJ: 1462 if (h->ident != sp->confid[cp->protoidx]) { 1463 if (debug) 1464 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1465 ifp->if_xname, cp->name, 1466 h->ident, sp->confid[cp->protoidx]); 1467 ++ifp->if_ierrors; 1468 break; 1469 } 1470 if (h->type == CONF_NAK) 1471 (cp->RCN_nak)(sp, h, len); 1472 else /* CONF_REJ */ 1473 (cp->RCN_rej)(sp, h, len); 1474 1475 switch (sp->state[cp->protoidx]) { 1476 case STATE_CLOSED: 1477 case STATE_STOPPED: 1478 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1479 break; 1480 case STATE_REQ_SENT: 1481 case STATE_ACK_SENT: 1482 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1483 (cp->scr)(sp); 1484 break; 1485 case STATE_OPENED: 1486 (cp->tld)(sp); 1487 /* fall through */ 1488 case STATE_ACK_RCVD: 1489 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1490 (cp->scr)(sp); 1491 break; 1492 case STATE_CLOSING: 1493 case STATE_STOPPING: 1494 break; 1495 default: 1496 printf("%s: %s illegal %s in state %s\n", 1497 ifp->if_xname, cp->name, 1498 sppp_cp_type_name(h->type), 1499 sppp_state_name(sp->state[cp->protoidx])); 1500 ++ifp->if_ierrors; 1501 } 1502 break; 1503 1504 case TERM_REQ: 1505 switch (sp->state[cp->protoidx]) { 1506 case STATE_ACK_RCVD: 1507 case STATE_ACK_SENT: 1508 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1509 /* fall through */ 1510 case STATE_CLOSED: 1511 case STATE_STOPPED: 1512 case STATE_CLOSING: 1513 case STATE_STOPPING: 1514 case STATE_REQ_SENT: 1515 sta: 1516 /* Send Terminate-Ack packet. */ 1517 if (debug) 1518 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1519 ifp->if_xname, cp->name); 1520 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1521 break; 1522 case STATE_OPENED: 1523 (cp->tld)(sp); 1524 sp->rst_counter[cp->protoidx] = 0; 1525 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1526 goto sta; 1527 default: 1528 printf("%s: %s illegal %s in state %s\n", 1529 ifp->if_xname, cp->name, 1530 sppp_cp_type_name(h->type), 1531 sppp_state_name(sp->state[cp->protoidx])); 1532 ++ifp->if_ierrors; 1533 } 1534 break; 1535 case TERM_ACK: 1536 switch (sp->state[cp->protoidx]) { 1537 case STATE_CLOSED: 1538 case STATE_STOPPED: 1539 case STATE_REQ_SENT: 1540 case STATE_ACK_SENT: 1541 break; 1542 case STATE_CLOSING: 1543 (cp->tlf)(sp); 1544 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1545 sppp_lcp_check_and_close(sp); 1546 break; 1547 case STATE_STOPPING: 1548 (cp->tlf)(sp); 1549 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1550 sppp_lcp_check_and_close(sp); 1551 break; 1552 case STATE_ACK_RCVD: 1553 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1554 break; 1555 case STATE_OPENED: 1556 (cp->tld)(sp); 1557 (cp->scr)(sp); 1558 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1559 break; 1560 default: 1561 printf("%s: %s illegal %s in state %s\n", 1562 ifp->if_xname, cp->name, 1563 sppp_cp_type_name(h->type), 1564 sppp_state_name(sp->state[cp->protoidx])); 1565 ++ifp->if_ierrors; 1566 } 1567 break; 1568 case CODE_REJ: 1569 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1570 log(LOG_INFO, 1571 "%s: %s: ignoring RXJ (%s) for code ?, " 1572 "danger will robinson\n", 1573 ifp->if_xname, cp->name, 1574 sppp_cp_type_name(h->type)); 1575 switch (sp->state[cp->protoidx]) { 1576 case STATE_CLOSED: 1577 case STATE_STOPPED: 1578 case STATE_REQ_SENT: 1579 case STATE_ACK_SENT: 1580 case STATE_CLOSING: 1581 case STATE_STOPPING: 1582 case STATE_OPENED: 1583 break; 1584 case STATE_ACK_RCVD: 1585 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1586 break; 1587 default: 1588 printf("%s: %s illegal %s in state %s\n", 1589 ifp->if_xname, cp->name, 1590 sppp_cp_type_name(h->type), 1591 sppp_state_name(sp->state[cp->protoidx])); 1592 ++ifp->if_ierrors; 1593 } 1594 break; 1595 case PROTO_REJ: 1596 { 1597 int catastrophic; 1598 const struct cp *upper; 1599 int i; 1600 uint16_t proto; 1601 1602 catastrophic = 0; 1603 upper = NULL; 1604 proto = p[0] << 8 | p[1]; 1605 for (i = 0; i < IDX_COUNT; i++) { 1606 if (cps[i]->proto == proto) { 1607 upper = cps[i]; 1608 break; 1609 } 1610 } 1611 if (upper == NULL) 1612 catastrophic++; 1613 1614 if (debug) 1615 log(LOG_INFO, 1616 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1617 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1618 sppp_cp_type_name(h->type), proto, 1619 upper ? upper->name : "unknown", 1620 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1621 1622 /* 1623 * if we got RXJ+ against conf-req, the peer does not implement 1624 * this particular protocol type. terminate the protocol. 1625 */ 1626 if (upper && !catastrophic) { 1627 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1628 upper->Close(sp); 1629 break; 1630 } 1631 } 1632 1633 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1634 switch (sp->state[cp->protoidx]) { 1635 case STATE_CLOSED: 1636 case STATE_STOPPED: 1637 case STATE_REQ_SENT: 1638 case STATE_ACK_SENT: 1639 case STATE_CLOSING: 1640 case STATE_STOPPING: 1641 case STATE_OPENED: 1642 break; 1643 case STATE_ACK_RCVD: 1644 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1645 break; 1646 default: 1647 printf("%s: %s illegal %s in state %s\n", 1648 ifp->if_xname, cp->name, 1649 sppp_cp_type_name(h->type), 1650 sppp_state_name(sp->state[cp->protoidx])); 1651 ++ifp->if_ierrors; 1652 } 1653 break; 1654 } 1655 case DISC_REQ: 1656 if (cp->proto != PPP_LCP) 1657 goto illegal; 1658 /* Discard the packet. */ 1659 break; 1660 case ECHO_REQ: 1661 if (cp->proto != PPP_LCP) 1662 goto illegal; 1663 if (sp->state[cp->protoidx] != STATE_OPENED) { 1664 if (debug) 1665 addlog("%s: lcp echo req but lcp closed\n", 1666 ifp->if_xname); 1667 ++ifp->if_ierrors; 1668 break; 1669 } 1670 if (len < 8) { 1671 if (debug) 1672 addlog("%s: invalid lcp echo request " 1673 "packet length: %d bytes\n", 1674 ifp->if_xname, len); 1675 break; 1676 } 1677 memcpy(&u32, h + 1, sizeof u32); 1678 if (ntohl(u32) == sp->lcp.magic) { 1679 /* Line loopback mode detected. */ 1680 printf("%s: loopback\n", ifp->if_xname); 1681 if_down(ifp); 1682 IF_PURGE(&sp->pp_cpq); 1683 1684 /* Shut down the PPP link. */ 1685 /* XXX */ 1686 lcp.Down(sp); 1687 lcp.Up(sp); 1688 break; 1689 } 1690 u32 = htonl(sp->lcp.magic); 1691 memcpy(h + 1, &u32, sizeof u32); 1692 if (debug) 1693 addlog("%s: got lcp echo req, sending echo rep\n", 1694 ifp->if_xname); 1695 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1696 h + 1); 1697 break; 1698 case ECHO_REPLY: 1699 if (cp->proto != PPP_LCP) 1700 goto illegal; 1701 if (h->ident != sp->lcp.echoid) { 1702 ++ifp->if_ierrors; 1703 break; 1704 } 1705 if (len < 8) { 1706 if (debug) 1707 addlog("%s: lcp invalid echo reply " 1708 "packet length: %d bytes\n", 1709 ifp->if_xname, len); 1710 break; 1711 } 1712 if (debug) 1713 addlog("%s: lcp got echo rep\n", 1714 ifp->if_xname); 1715 memcpy(&u32, h + 1, sizeof u32); 1716 if (ntohl(u32) != sp->lcp.magic) 1717 sp->pp_alivecnt = 0; 1718 break; 1719 default: 1720 /* Unknown packet type -- send Code-Reject packet. */ 1721 illegal: 1722 if (debug) 1723 addlog("%s: %s send code-rej for 0x%x\n", 1724 ifp->if_xname, cp->name, h->type); 1725 sppp_cp_send(sp, cp->proto, CODE_REJ, 1726 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1727 ++ifp->if_ierrors; 1728 } 1729 } 1730 1731 1732 /* 1733 * The generic part of all Up/Down/Open/Close/TO event handlers. 1734 * Basically, the state transition handling in the automaton. 1735 */ 1736 static void 1737 sppp_up_event(const struct cp *cp, struct sppp *sp) 1738 { 1739 STDDCL; 1740 1741 if (debug) 1742 log(LOG_DEBUG, "%s: %s up(%s)\n", 1743 ifp->if_xname, cp->name, 1744 sppp_state_name(sp->state[cp->protoidx])); 1745 1746 switch (sp->state[cp->protoidx]) { 1747 case STATE_INITIAL: 1748 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1749 break; 1750 case STATE_STARTING: 1751 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1752 (cp->scr)(sp); 1753 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1754 break; 1755 default: 1756 printf("%s: %s illegal up in state %s\n", 1757 ifp->if_xname, cp->name, 1758 sppp_state_name(sp->state[cp->protoidx])); 1759 } 1760 } 1761 1762 static void 1763 sppp_down_event(const struct cp *cp, struct sppp *sp) 1764 { 1765 STDDCL; 1766 1767 if (debug) 1768 log(LOG_DEBUG, "%s: %s down(%s)\n", 1769 ifp->if_xname, cp->name, 1770 sppp_state_name(sp->state[cp->protoidx])); 1771 1772 switch (sp->state[cp->protoidx]) { 1773 case STATE_CLOSED: 1774 case STATE_CLOSING: 1775 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1776 break; 1777 case STATE_STOPPED: 1778 (cp->tls)(sp); 1779 /* fall through */ 1780 case STATE_STOPPING: 1781 case STATE_REQ_SENT: 1782 case STATE_ACK_RCVD: 1783 case STATE_ACK_SENT: 1784 sppp_cp_change_state(cp, sp, STATE_STARTING); 1785 break; 1786 case STATE_OPENED: 1787 (cp->tld)(sp); 1788 sppp_cp_change_state(cp, sp, STATE_STARTING); 1789 break; 1790 default: 1791 printf("%s: %s illegal down in state %s\n", 1792 ifp->if_xname, cp->name, 1793 sppp_state_name(sp->state[cp->protoidx])); 1794 } 1795 } 1796 1797 1798 static void 1799 sppp_open_event(const struct cp *cp, struct sppp *sp) 1800 { 1801 STDDCL; 1802 1803 if (debug) 1804 log(LOG_DEBUG, "%s: %s open(%s)\n", 1805 ifp->if_xname, cp->name, 1806 sppp_state_name(sp->state[cp->protoidx])); 1807 1808 switch (sp->state[cp->protoidx]) { 1809 case STATE_INITIAL: 1810 sppp_cp_change_state(cp, sp, STATE_STARTING); 1811 (cp->tls)(sp); 1812 break; 1813 case STATE_STARTING: 1814 break; 1815 case STATE_CLOSED: 1816 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1817 (cp->scr)(sp); 1818 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1819 break; 1820 case STATE_STOPPED: 1821 case STATE_STOPPING: 1822 case STATE_REQ_SENT: 1823 case STATE_ACK_RCVD: 1824 case STATE_ACK_SENT: 1825 case STATE_OPENED: 1826 break; 1827 case STATE_CLOSING: 1828 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1829 break; 1830 } 1831 } 1832 1833 1834 static void 1835 sppp_close_event(const struct cp *cp, struct sppp *sp) 1836 { 1837 STDDCL; 1838 1839 if (debug) 1840 log(LOG_DEBUG, "%s: %s close(%s)\n", 1841 ifp->if_xname, cp->name, 1842 sppp_state_name(sp->state[cp->protoidx])); 1843 1844 switch (sp->state[cp->protoidx]) { 1845 case STATE_INITIAL: 1846 case STATE_CLOSED: 1847 case STATE_CLOSING: 1848 break; 1849 case STATE_STARTING: 1850 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1851 (cp->tlf)(sp); 1852 break; 1853 case STATE_STOPPED: 1854 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1855 break; 1856 case STATE_STOPPING: 1857 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1858 break; 1859 case STATE_OPENED: 1860 (cp->tld)(sp); 1861 /* fall through */ 1862 case STATE_REQ_SENT: 1863 case STATE_ACK_RCVD: 1864 case STATE_ACK_SENT: 1865 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1866 sppp_cp_send(sp, cp->proto, TERM_REQ, 1867 ++sp->pp_seq[cp->protoidx], 0, 0); 1868 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1869 break; 1870 } 1871 } 1872 1873 static void 1874 sppp_to_event(const struct cp *cp, struct sppp *sp) 1875 { 1876 STDDCL; 1877 int s; 1878 1879 s = splnet(); 1880 if (debug) 1881 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1882 ifp->if_xname, cp->name, 1883 sppp_state_name(sp->state[cp->protoidx]), 1884 sp->rst_counter[cp->protoidx]); 1885 1886 if (--sp->rst_counter[cp->protoidx] < 0) 1887 /* TO- event */ 1888 switch (sp->state[cp->protoidx]) { 1889 case STATE_CLOSING: 1890 (cp->tlf)(sp); 1891 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1892 sppp_lcp_check_and_close(sp); 1893 break; 1894 case STATE_STOPPING: 1895 (cp->tlf)(sp); 1896 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1897 sppp_lcp_check_and_close(sp); 1898 break; 1899 case STATE_REQ_SENT: 1900 case STATE_ACK_RCVD: 1901 case STATE_ACK_SENT: 1902 (cp->tlf)(sp); 1903 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1904 sppp_lcp_check_and_close(sp); 1905 break; 1906 } 1907 else 1908 /* TO+ event */ 1909 switch (sp->state[cp->protoidx]) { 1910 case STATE_CLOSING: 1911 case STATE_STOPPING: 1912 sppp_cp_send(sp, cp->proto, TERM_REQ, 1913 ++sp->pp_seq[cp->protoidx], 0, 0); 1914 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1915 cp->TO, sp); 1916 break; 1917 case STATE_REQ_SENT: 1918 case STATE_ACK_RCVD: 1919 (cp->scr)(sp); 1920 /* sppp_cp_change_state() will restart the timer */ 1921 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1922 break; 1923 case STATE_ACK_SENT: 1924 (cp->scr)(sp); 1925 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1926 cp->TO, sp); 1927 break; 1928 } 1929 1930 splx(s); 1931 } 1932 1933 /* 1934 * Change the state of a control protocol in the state automaton. 1935 * Takes care of starting/stopping the restart timer. 1936 */ 1937 void 1938 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1939 { 1940 sp->state[cp->protoidx] = newstate; 1941 callout_stop(&sp->ch[cp->protoidx]); 1942 switch (newstate) { 1943 case STATE_INITIAL: 1944 case STATE_STARTING: 1945 case STATE_CLOSED: 1946 case STATE_STOPPED: 1947 case STATE_OPENED: 1948 break; 1949 case STATE_CLOSING: 1950 case STATE_STOPPING: 1951 case STATE_REQ_SENT: 1952 case STATE_ACK_RCVD: 1953 case STATE_ACK_SENT: 1954 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1955 cp->TO, sp); 1956 break; 1957 } 1958 } 1959 1960 /* 1961 *--------------------------------------------------------------------------* 1962 * * 1963 * The LCP implementation. * 1964 * * 1965 *--------------------------------------------------------------------------* 1966 */ 1967 static void 1968 sppp_lcp_init(struct sppp *sp) 1969 { 1970 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1971 sp->lcp.magic = 0; 1972 sp->state[IDX_LCP] = STATE_INITIAL; 1973 sp->fail_counter[IDX_LCP] = 0; 1974 sp->pp_seq[IDX_LCP] = 0; 1975 sp->pp_rseq[IDX_LCP] = 0; 1976 sp->lcp.protos = 0; 1977 1978 /* 1979 * Initialize counters and timeout values. Note that we don't 1980 * use the 3 seconds suggested in RFC 1661 since we are likely 1981 * running on a fast link. XXX We should probably implement 1982 * the exponential backoff option. Note that these values are 1983 * relevant for all control protocols, not just LCP only. 1984 */ 1985 sp->lcp.timeout = 1 * hz; 1986 sp->lcp.max_terminate = 2; 1987 sp->lcp.max_configure = 10; 1988 sp->lcp.max_failure = 10; 1989 callout_init(&sp->ch[IDX_LCP], 0); 1990 } 1991 1992 static void 1993 sppp_lcp_up(struct sppp *sp) 1994 { 1995 STDDCL; 1996 1997 /* Initialize activity timestamp: opening a connection is an activity */ 1998 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 1999 2000 /* 2001 * If this interface is passive or dial-on-demand, and we are 2002 * still in Initial state, it means we've got an incoming 2003 * call. Activate the interface. 2004 */ 2005 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2006 if (debug) 2007 log(LOG_DEBUG, 2008 "%s: Up event", ifp->if_xname); 2009 ifp->if_flags |= IFF_RUNNING; 2010 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2011 if (debug) 2012 addlog("(incoming call)\n"); 2013 sp->pp_flags |= PP_CALLIN; 2014 lcp.Open(sp); 2015 } else if (debug) 2016 addlog("\n"); 2017 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2018 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2019 ifp->if_flags |= IFF_RUNNING; 2020 lcp.Open(sp); 2021 } 2022 2023 sppp_up_event(&lcp, sp); 2024 } 2025 2026 static void 2027 sppp_lcp_down(struct sppp *sp) 2028 { 2029 STDDCL; 2030 2031 sppp_down_event(&lcp, sp); 2032 2033 /* 2034 * If this is neither a dial-on-demand nor a passive 2035 * interface, simulate an ``ifconfig down'' action, so the 2036 * administrator can force a redial by another ``ifconfig 2037 * up''. XXX For leased line operation, should we immediately 2038 * try to reopen the connection here? 2039 */ 2040 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2041 if (debug) 2042 log(LOG_INFO, 2043 "%s: Down event (carrier loss), taking interface down.\n", 2044 ifp->if_xname); 2045 if_down(ifp); 2046 } else { 2047 if (debug) 2048 log(LOG_DEBUG, 2049 "%s: Down event (carrier loss)\n", 2050 ifp->if_xname); 2051 } 2052 sp->pp_flags &= ~PP_CALLIN; 2053 if (sp->state[IDX_LCP] != STATE_INITIAL) 2054 lcp.Close(sp); 2055 ifp->if_flags &= ~IFF_RUNNING; 2056 } 2057 2058 static void 2059 sppp_lcp_open(struct sppp *sp) 2060 { 2061 if (sp->pp_if.if_mtu < PP_MTU) { 2062 sp->lcp.mru = sp->pp_if.if_mtu; 2063 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2064 } else 2065 sp->lcp.mru = PP_MTU; 2066 sp->lcp.their_mru = PP_MTU; 2067 2068 /* 2069 * If we are authenticator, negotiate LCP_AUTH 2070 */ 2071 if (sp->hisauth.proto != 0) 2072 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2073 else 2074 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2075 sp->pp_flags &= ~PP_NEEDAUTH; 2076 sppp_open_event(&lcp, sp); 2077 } 2078 2079 static void 2080 sppp_lcp_close(struct sppp *sp) 2081 { 2082 sppp_close_event(&lcp, sp); 2083 } 2084 2085 static void 2086 sppp_lcp_TO(void *cookie) 2087 { 2088 sppp_to_event(&lcp, (struct sppp *)cookie); 2089 } 2090 2091 /* 2092 * Analyze a configure request. Return true if it was agreeable, and 2093 * caused action sca, false if it has been rejected or nak'ed, and 2094 * caused action scn. (The return value is used to make the state 2095 * transition decision in the state automaton.) 2096 */ 2097 static int 2098 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2099 { 2100 STDDCL; 2101 u_char *buf, *r, *p; 2102 int origlen, rlen; 2103 uint32_t nmagic; 2104 u_short authproto; 2105 2106 len -= 4; 2107 origlen = len; 2108 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2109 if (! buf) 2110 return (0); 2111 2112 if (debug) 2113 log(LOG_DEBUG, "%s: lcp parse opts:", 2114 ifp->if_xname); 2115 2116 /* pass 1: check for things that need to be rejected */ 2117 p = (void *)(h + 1); 2118 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2119 /* Sanity check option length */ 2120 if (p[1] > len) { 2121 /* 2122 * Malicious option - drop immediately. 2123 * XXX Maybe we should just RXJ it? 2124 */ 2125 addlog("%s: received malicious LCP option 0x%02x, " 2126 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2127 p[0], p[1], len); 2128 goto drop; 2129 } 2130 if (debug) 2131 addlog(" %s", sppp_lcp_opt_name(*p)); 2132 switch (*p) { 2133 case LCP_OPT_MAGIC: 2134 /* Magic number. */ 2135 /* fall through, both are same length */ 2136 case LCP_OPT_ASYNC_MAP: 2137 /* Async control character map. */ 2138 if (len >= 6 || p[1] == 6) 2139 continue; 2140 if (debug) 2141 addlog(" [invalid]"); 2142 break; 2143 case LCP_OPT_MRU: 2144 /* Maximum receive unit. */ 2145 if (len >= 4 && p[1] == 4) 2146 continue; 2147 if (debug) 2148 addlog(" [invalid]"); 2149 break; 2150 case LCP_OPT_AUTH_PROTO: 2151 if (len < 4) { 2152 if (debug) 2153 addlog(" [invalid]"); 2154 break; 2155 } 2156 authproto = (p[2] << 8) + p[3]; 2157 if (authproto == PPP_CHAP && p[1] != 5) { 2158 if (debug) 2159 addlog(" [invalid chap len]"); 2160 break; 2161 } 2162 if (sp->myauth.proto == 0) { 2163 /* we are not configured to do auth */ 2164 if (debug) 2165 addlog(" [not configured]"); 2166 break; 2167 } 2168 /* 2169 * Remote want us to authenticate, remember this, 2170 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2171 * up. 2172 */ 2173 sp->pp_flags |= PP_NEEDAUTH; 2174 continue; 2175 default: 2176 /* Others not supported. */ 2177 if (debug) 2178 addlog(" [rej]"); 2179 break; 2180 } 2181 /* Add the option to rejected list. */ 2182 bcopy (p, r, p[1]); 2183 r += p[1]; 2184 rlen += p[1]; 2185 } 2186 if (rlen) { 2187 if (debug) 2188 addlog(" send conf-rej\n"); 2189 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2190 goto end; 2191 } else if (debug) 2192 addlog("\n"); 2193 2194 /* 2195 * pass 2: check for option values that are unacceptable and 2196 * thus require to be nak'ed. 2197 */ 2198 if (debug) 2199 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2200 ifp->if_xname); 2201 2202 p = (void *)(h + 1); 2203 len = origlen; 2204 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2205 if (debug) 2206 addlog(" %s", sppp_lcp_opt_name(*p)); 2207 switch (*p) { 2208 case LCP_OPT_MAGIC: 2209 /* Magic number -- extract. */ 2210 nmagic = (uint32_t)p[2] << 24 | 2211 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2212 if (nmagic != sp->lcp.magic) { 2213 if (debug) 2214 addlog(" 0x%x", nmagic); 2215 continue; 2216 } 2217 /* 2218 * Local and remote magics equal -- loopback? 2219 */ 2220 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2221 printf ("%s: loopback\n", 2222 ifp->if_xname); 2223 sp->pp_loopcnt = 0; 2224 if (ifp->if_flags & IFF_UP) { 2225 if_down(ifp); 2226 IF_PURGE(&sp->pp_cpq); 2227 /* XXX ? */ 2228 lcp.Down(sp); 2229 lcp.Up(sp); 2230 } 2231 } else if (debug) 2232 addlog(" [glitch]"); 2233 ++sp->pp_loopcnt; 2234 /* 2235 * We negate our magic here, and NAK it. If 2236 * we see it later in an NAK packet, we 2237 * suggest a new one. 2238 */ 2239 nmagic = ~sp->lcp.magic; 2240 /* Gonna NAK it. */ 2241 p[2] = nmagic >> 24; 2242 p[3] = nmagic >> 16; 2243 p[4] = nmagic >> 8; 2244 p[5] = nmagic; 2245 break; 2246 2247 case LCP_OPT_ASYNC_MAP: 2248 /* 2249 * Async control character map -- just ignore it. 2250 * 2251 * Quote from RFC 1662, chapter 6: 2252 * To enable this functionality, synchronous PPP 2253 * implementations MUST always respond to the 2254 * Async-Control-Character-Map Configuration 2255 * Option with the LCP Configure-Ack. However, 2256 * acceptance of the Configuration Option does 2257 * not imply that the synchronous implementation 2258 * will do any ACCM mapping. Instead, all such 2259 * octet mapping will be performed by the 2260 * asynchronous-to-synchronous converter. 2261 */ 2262 continue; 2263 2264 case LCP_OPT_MRU: 2265 /* 2266 * Maximum receive unit. Always agreeable, 2267 * but ignored by now. 2268 */ 2269 sp->lcp.their_mru = p[2] * 256 + p[3]; 2270 if (debug) 2271 addlog(" %ld", sp->lcp.their_mru); 2272 continue; 2273 2274 case LCP_OPT_AUTH_PROTO: 2275 authproto = (p[2] << 8) + p[3]; 2276 if (sp->myauth.proto != authproto) { 2277 /* not agreed, nak */ 2278 if (debug) 2279 addlog(" [mine %s != his %s]", 2280 sppp_proto_name(sp->myauth.proto), 2281 sppp_proto_name(authproto)); 2282 p[2] = sp->myauth.proto >> 8; 2283 p[3] = sp->myauth.proto; 2284 break; 2285 } 2286 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2287 if (debug) 2288 addlog(" [chap not MD5]"); 2289 p[4] = CHAP_MD5; 2290 break; 2291 } 2292 continue; 2293 } 2294 /* Add the option to nak'ed list. */ 2295 bcopy (p, r, p[1]); 2296 r += p[1]; 2297 rlen += p[1]; 2298 } 2299 if (rlen) { 2300 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2301 if (debug) 2302 addlog(" max_failure (%d) exceeded, " 2303 "send conf-rej\n", 2304 sp->lcp.max_failure); 2305 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2306 } else { 2307 if (debug) 2308 addlog(" send conf-nak\n"); 2309 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2310 } 2311 goto end; 2312 } else { 2313 if (debug) 2314 addlog(" send conf-ack\n"); 2315 sp->fail_counter[IDX_LCP] = 0; 2316 sp->pp_loopcnt = 0; 2317 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2318 } 2319 2320 end: 2321 free(buf, M_TEMP); 2322 return (rlen == 0); 2323 2324 drop: 2325 free(buf, M_TEMP); 2326 return -1; 2327 } 2328 2329 /* 2330 * Analyze the LCP Configure-Reject option list, and adjust our 2331 * negotiation. 2332 */ 2333 static void 2334 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2335 { 2336 STDDCL; 2337 u_char *buf, *p; 2338 2339 len -= 4; 2340 buf = malloc (len, M_TEMP, M_NOWAIT); 2341 if (!buf) 2342 return; 2343 2344 if (debug) 2345 log(LOG_DEBUG, "%s: lcp rej opts:", 2346 ifp->if_xname); 2347 2348 p = (void *)(h + 1); 2349 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2350 /* Sanity check option length */ 2351 if (p[1] > len) { 2352 /* 2353 * Malicious option - drop immediately. 2354 * XXX Maybe we should just RXJ it? 2355 */ 2356 addlog("%s: received malicious LCP option, " 2357 "dropping.\n", ifp->if_xname); 2358 goto drop; 2359 } 2360 if (debug) 2361 addlog(" %s", sppp_lcp_opt_name(*p)); 2362 switch (*p) { 2363 case LCP_OPT_MAGIC: 2364 /* Magic number -- can't use it, use 0 */ 2365 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2366 sp->lcp.magic = 0; 2367 break; 2368 case LCP_OPT_MRU: 2369 /* 2370 * We try to negotiate a lower MRU if the underlying 2371 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2372 * peer rejects this lower rate, fallback to the 2373 * default. 2374 */ 2375 if (debug) { 2376 addlog("%s: warning: peer rejected our MRU of " 2377 "%ld bytes. Defaulting to %d bytes\n", 2378 ifp->if_xname, sp->lcp.mru, PP_MTU); 2379 } 2380 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2381 sp->lcp.mru = PP_MTU; 2382 break; 2383 case LCP_OPT_AUTH_PROTO: 2384 /* 2385 * Peer doesn't want to authenticate himself, 2386 * deny unless this is a dialout call, and 2387 * SPPP_AUTHFLAG_NOCALLOUT is set. 2388 */ 2389 if ((sp->pp_flags & PP_CALLIN) == 0 && 2390 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2391 if (debug) 2392 addlog(" [don't insist on auth " 2393 "for callout]"); 2394 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2395 break; 2396 } 2397 if (debug) 2398 addlog("[access denied]\n"); 2399 lcp.Close(sp); 2400 break; 2401 } 2402 } 2403 if (debug) 2404 addlog("\n"); 2405 drop: 2406 free(buf, M_TEMP); 2407 return; 2408 } 2409 2410 /* 2411 * Analyze the LCP Configure-NAK option list, and adjust our 2412 * negotiation. 2413 */ 2414 static void 2415 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2416 { 2417 STDDCL; 2418 u_char *buf, *p; 2419 uint32_t magic; 2420 2421 len -= 4; 2422 buf = malloc (len, M_TEMP, M_NOWAIT); 2423 if (!buf) 2424 return; 2425 2426 if (debug) 2427 log(LOG_DEBUG, "%s: lcp nak opts:", 2428 ifp->if_xname); 2429 2430 p = (void *)(h + 1); 2431 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2432 /* Sanity check option length */ 2433 if (p[1] > len) { 2434 /* 2435 * Malicious option - drop immediately. 2436 * XXX Maybe we should just RXJ it? 2437 */ 2438 addlog("%s: received malicious LCP option, " 2439 "dropping.\n", ifp->if_xname); 2440 goto drop; 2441 } 2442 if (debug) 2443 addlog(" %s", sppp_lcp_opt_name(*p)); 2444 switch (*p) { 2445 case LCP_OPT_MAGIC: 2446 /* Magic number -- renegotiate */ 2447 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2448 len >= 6 && p[1] == 6) { 2449 magic = (uint32_t)p[2] << 24 | 2450 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2451 /* 2452 * If the remote magic is our negated one, 2453 * this looks like a loopback problem. 2454 * Suggest a new magic to make sure. 2455 */ 2456 if (magic == ~sp->lcp.magic) { 2457 if (debug) 2458 addlog(" magic glitch"); 2459 sp->lcp.magic = cprng_fast32(); 2460 } else { 2461 sp->lcp.magic = magic; 2462 if (debug) 2463 addlog(" %d", magic); 2464 } 2465 } 2466 break; 2467 case LCP_OPT_MRU: 2468 /* 2469 * Peer wants to advise us to negotiate an MRU. 2470 * Agree on it if it's reasonable, or use 2471 * default otherwise. 2472 */ 2473 if (len >= 4 && p[1] == 4) { 2474 u_int mru = p[2] * 256 + p[3]; 2475 if (debug) 2476 addlog(" %d", mru); 2477 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2478 mru = sp->pp_if.if_mtu; 2479 sp->lcp.mru = mru; 2480 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2481 } 2482 break; 2483 case LCP_OPT_AUTH_PROTO: 2484 /* 2485 * Peer doesn't like our authentication method, 2486 * deny. 2487 */ 2488 if (debug) 2489 addlog("[access denied]\n"); 2490 lcp.Close(sp); 2491 break; 2492 } 2493 } 2494 if (debug) 2495 addlog("\n"); 2496 drop: 2497 free(buf, M_TEMP); 2498 return; 2499 } 2500 2501 static void 2502 sppp_lcp_tlu(struct sppp *sp) 2503 { 2504 STDDCL; 2505 int i; 2506 uint32_t mask; 2507 2508 /* XXX ? */ 2509 if (! (ifp->if_flags & IFF_UP) && 2510 (ifp->if_flags & IFF_RUNNING)) { 2511 /* Coming out of loopback mode. */ 2512 if_up(ifp); 2513 } 2514 2515 for (i = 0; i < IDX_COUNT; i++) 2516 if ((cps[i])->flags & CP_QUAL) 2517 (cps[i])->Open(sp); 2518 2519 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2520 (sp->pp_flags & PP_NEEDAUTH) != 0) 2521 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2522 else 2523 sp->pp_phase = SPPP_PHASE_NETWORK; 2524 2525 if (debug) 2526 { 2527 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2528 sppp_phase_name(sp->pp_phase)); 2529 } 2530 2531 /* 2532 * Open all authentication protocols. This is even required 2533 * if we already proceeded to network phase, since it might be 2534 * that remote wants us to authenticate, so we might have to 2535 * send a PAP request. Undesired authentication protocols 2536 * don't do anything when they get an Open event. 2537 */ 2538 for (i = 0; i < IDX_COUNT; i++) 2539 if ((cps[i])->flags & CP_AUTH) 2540 (cps[i])->Open(sp); 2541 2542 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2543 /* Notify all NCPs. */ 2544 for (i = 0; i < IDX_COUNT; i++) 2545 if ((cps[i])->flags & CP_NCP) 2546 (cps[i])->Open(sp); 2547 } 2548 2549 /* Send Up events to all started protos. */ 2550 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2551 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2552 (cps[i])->Up(sp); 2553 2554 /* notify low-level driver of state change */ 2555 if (sp->pp_chg) 2556 sp->pp_chg(sp, (int)sp->pp_phase); 2557 2558 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2559 /* if no NCP is starting, close down */ 2560 sppp_lcp_check_and_close(sp); 2561 } 2562 2563 static void 2564 sppp_lcp_tld(struct sppp *sp) 2565 { 2566 STDDCL; 2567 int i; 2568 uint32_t mask; 2569 2570 sp->pp_phase = SPPP_PHASE_TERMINATE; 2571 2572 if (debug) 2573 { 2574 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2575 sppp_phase_name(sp->pp_phase)); 2576 } 2577 2578 /* 2579 * Take upper layers down. We send the Down event first and 2580 * the Close second to prevent the upper layers from sending 2581 * ``a flurry of terminate-request packets'', as the RFC 2582 * describes it. 2583 */ 2584 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2585 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2586 (cps[i])->Down(sp); 2587 (cps[i])->Close(sp); 2588 } 2589 } 2590 2591 static void 2592 sppp_lcp_tls(struct sppp *sp) 2593 { 2594 STDDCL; 2595 2596 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2597 printf("%s: authentication failed %d times, not retrying again\n", 2598 sp->pp_if.if_xname, sp->pp_auth_failures); 2599 if_down(&sp->pp_if); 2600 return; 2601 } 2602 2603 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2604 2605 if (debug) 2606 { 2607 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2608 sppp_phase_name(sp->pp_phase)); 2609 } 2610 2611 /* Notify lower layer if desired. */ 2612 if (sp->pp_tls) 2613 (sp->pp_tls)(sp); 2614 } 2615 2616 static void 2617 sppp_lcp_tlf(struct sppp *sp) 2618 { 2619 STDDCL; 2620 2621 sp->pp_phase = SPPP_PHASE_DEAD; 2622 2623 if (debug) 2624 { 2625 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2626 sppp_phase_name(sp->pp_phase)); 2627 } 2628 2629 /* Notify lower layer if desired. */ 2630 if (sp->pp_tlf) 2631 (sp->pp_tlf)(sp); 2632 } 2633 2634 static void 2635 sppp_lcp_scr(struct sppp *sp) 2636 { 2637 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2638 int i = 0; 2639 u_short authproto; 2640 2641 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2642 if (! sp->lcp.magic) 2643 sp->lcp.magic = cprng_fast32(); 2644 opt[i++] = LCP_OPT_MAGIC; 2645 opt[i++] = 6; 2646 opt[i++] = sp->lcp.magic >> 24; 2647 opt[i++] = sp->lcp.magic >> 16; 2648 opt[i++] = sp->lcp.magic >> 8; 2649 opt[i++] = sp->lcp.magic; 2650 } 2651 2652 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2653 opt[i++] = LCP_OPT_MRU; 2654 opt[i++] = 4; 2655 opt[i++] = sp->lcp.mru >> 8; 2656 opt[i++] = sp->lcp.mru; 2657 } 2658 2659 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2660 authproto = sp->hisauth.proto; 2661 opt[i++] = LCP_OPT_AUTH_PROTO; 2662 opt[i++] = authproto == PPP_CHAP? 5: 4; 2663 opt[i++] = authproto >> 8; 2664 opt[i++] = authproto; 2665 if (authproto == PPP_CHAP) 2666 opt[i++] = CHAP_MD5; 2667 } 2668 2669 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2670 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2671 } 2672 2673 /* 2674 * Check the open NCPs, return true if at least one NCP is open. 2675 */ 2676 static int 2677 sppp_ncp_check(struct sppp *sp) 2678 { 2679 int i, mask; 2680 2681 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2682 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2683 return 1; 2684 return 0; 2685 } 2686 2687 /* 2688 * Re-check the open NCPs and see if we should terminate the link. 2689 * Called by the NCPs during their tlf action handling. 2690 */ 2691 static void 2692 sppp_lcp_check_and_close(struct sppp *sp) 2693 { 2694 2695 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2696 /* don't bother, we are already going down */ 2697 return; 2698 2699 if (sppp_ncp_check(sp)) 2700 return; 2701 2702 lcp.Close(sp); 2703 } 2704 2705 2706 /* 2707 *--------------------------------------------------------------------------* 2708 * * 2709 * The IPCP implementation. * 2710 * * 2711 *--------------------------------------------------------------------------* 2712 */ 2713 2714 static void 2715 sppp_ipcp_init(struct sppp *sp) 2716 { 2717 sp->ipcp.opts = 0; 2718 sp->ipcp.flags = 0; 2719 sp->state[IDX_IPCP] = STATE_INITIAL; 2720 sp->fail_counter[IDX_IPCP] = 0; 2721 sp->pp_seq[IDX_IPCP] = 0; 2722 sp->pp_rseq[IDX_IPCP] = 0; 2723 callout_init(&sp->ch[IDX_IPCP], 0); 2724 } 2725 2726 static void 2727 sppp_ipcp_up(struct sppp *sp) 2728 { 2729 sppp_up_event(&ipcp, sp); 2730 } 2731 2732 static void 2733 sppp_ipcp_down(struct sppp *sp) 2734 { 2735 sppp_down_event(&ipcp, sp); 2736 } 2737 2738 static void 2739 sppp_ipcp_open(struct sppp *sp) 2740 { 2741 STDDCL; 2742 uint32_t myaddr, hisaddr; 2743 2744 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2745 sp->ipcp.req_myaddr = 0; 2746 sp->ipcp.req_hisaddr = 0; 2747 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2748 2749 #ifdef INET 2750 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2751 #else 2752 myaddr = hisaddr = 0; 2753 #endif 2754 /* 2755 * If we don't have his address, this probably means our 2756 * interface doesn't want to talk IP at all. (This could 2757 * be the case if somebody wants to speak only IPX, for 2758 * example.) Don't open IPCP in this case. 2759 */ 2760 if (hisaddr == 0) { 2761 /* XXX this message should go away */ 2762 if (debug) 2763 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2764 ifp->if_xname); 2765 return; 2766 } 2767 2768 if (myaddr == 0) { 2769 /* 2770 * I don't have an assigned address, so i need to 2771 * negotiate my address. 2772 */ 2773 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2774 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2775 } 2776 if (hisaddr == 1) { 2777 /* 2778 * XXX - remove this hack! 2779 * remote has no valid address, we need to get one assigned. 2780 */ 2781 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2782 } 2783 sppp_open_event(&ipcp, sp); 2784 } 2785 2786 static void 2787 sppp_ipcp_close(struct sppp *sp) 2788 { 2789 STDDCL; 2790 2791 sppp_close_event(&ipcp, sp); 2792 #ifdef INET 2793 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2794 /* 2795 * Some address was dynamic, clear it again. 2796 */ 2797 sppp_clear_ip_addrs(sp); 2798 #endif 2799 2800 if (sp->pp_saved_mtu > 0) { 2801 ifp->if_mtu = sp->pp_saved_mtu; 2802 sp->pp_saved_mtu = 0; 2803 if (debug) 2804 log(LOG_DEBUG, 2805 "%s: resetting MTU to %" PRIu64 " bytes\n", 2806 ifp->if_xname, ifp->if_mtu); 2807 } 2808 } 2809 2810 static void 2811 sppp_ipcp_TO(void *cookie) 2812 { 2813 sppp_to_event(&ipcp, (struct sppp *)cookie); 2814 } 2815 2816 /* 2817 * Analyze a configure request. Return true if it was agreeable, and 2818 * caused action sca, false if it has been rejected or nak'ed, and 2819 * caused action scn. (The return value is used to make the state 2820 * transition decision in the state automaton.) 2821 */ 2822 static int 2823 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2824 { 2825 u_char *buf, *r, *p; 2826 struct ifnet *ifp = &sp->pp_if; 2827 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2828 uint32_t hisaddr, desiredaddr; 2829 2830 len -= 4; 2831 origlen = len; 2832 /* 2833 * Make sure to allocate a buf that can at least hold a 2834 * conf-nak with an `address' option. We might need it below. 2835 */ 2836 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2837 if (! buf) 2838 return (0); 2839 2840 /* pass 1: see if we can recognize them */ 2841 if (debug) 2842 log(LOG_DEBUG, "%s: ipcp parse opts:", 2843 ifp->if_xname); 2844 p = (void *)(h + 1); 2845 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2846 /* Sanity check option length */ 2847 if (p[1] > len) { 2848 /* XXX should we just RXJ? */ 2849 addlog("%s: malicious IPCP option received, dropping\n", 2850 ifp->if_xname); 2851 goto drop; 2852 } 2853 if (debug) 2854 addlog(" %s", sppp_ipcp_opt_name(*p)); 2855 switch (*p) { 2856 #ifdef notyet 2857 case IPCP_OPT_COMPRESSION: 2858 if (len >= 6 && p[1] >= 6) { 2859 /* correctly formed compress option */ 2860 continue; 2861 } 2862 if (debug) 2863 addlog(" [invalid]"); 2864 break; 2865 #endif 2866 case IPCP_OPT_ADDRESS: 2867 if (len >= 6 && p[1] == 6) { 2868 /* correctly formed address option */ 2869 continue; 2870 } 2871 if (debug) 2872 addlog(" [invalid]"); 2873 break; 2874 default: 2875 /* Others not supported. */ 2876 if (debug) 2877 addlog(" [rej]"); 2878 break; 2879 } 2880 /* Add the option to rejected list. */ 2881 bcopy (p, r, p[1]); 2882 r += p[1]; 2883 rlen += p[1]; 2884 } 2885 if (rlen) { 2886 if (debug) 2887 addlog(" send conf-rej\n"); 2888 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2889 goto end; 2890 } else if (debug) 2891 addlog("\n"); 2892 2893 /* pass 2: parse option values */ 2894 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2895 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2896 else 2897 #ifdef INET 2898 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2899 #else 2900 hisaddr = 0; 2901 #endif 2902 if (debug) 2903 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2904 ifp->if_xname); 2905 p = (void *)(h + 1); 2906 len = origlen; 2907 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2908 if (debug) 2909 addlog(" %s", sppp_ipcp_opt_name(*p)); 2910 switch (*p) { 2911 #ifdef notyet 2912 case IPCP_OPT_COMPRESSION: 2913 continue; 2914 #endif 2915 case IPCP_OPT_ADDRESS: 2916 desiredaddr = p[2] << 24 | p[3] << 16 | 2917 p[4] << 8 | p[5]; 2918 if (desiredaddr == hisaddr || 2919 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2920 /* 2921 * Peer's address is same as our value, 2922 * this is agreeable. Gonna conf-ack 2923 * it. 2924 */ 2925 if (debug) 2926 addlog(" %s [ack]", 2927 sppp_dotted_quad(hisaddr)); 2928 /* record that we've seen it already */ 2929 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2930 sp->ipcp.req_hisaddr = desiredaddr; 2931 hisaddr = desiredaddr; 2932 continue; 2933 } 2934 /* 2935 * The address wasn't agreeable. This is either 2936 * he sent us 0.0.0.0, asking to assign him an 2937 * address, or he send us another address not 2938 * matching our value. Either case, we gonna 2939 * conf-nak it with our value. 2940 */ 2941 if (debug) { 2942 if (desiredaddr == 0) 2943 addlog(" [addr requested]"); 2944 else 2945 addlog(" %s [not agreed]", 2946 sppp_dotted_quad(desiredaddr)); 2947 } 2948 2949 p[2] = hisaddr >> 24; 2950 p[3] = hisaddr >> 16; 2951 p[4] = hisaddr >> 8; 2952 p[5] = hisaddr; 2953 break; 2954 } 2955 /* Add the option to nak'ed list. */ 2956 bcopy (p, r, p[1]); 2957 r += p[1]; 2958 rlen += p[1]; 2959 } 2960 2961 /* 2962 * If we are about to conf-ack the request, but haven't seen 2963 * his address so far, gonna conf-nak it instead, with the 2964 * `address' option present and our idea of his address being 2965 * filled in there, to request negotiation of both addresses. 2966 * 2967 * XXX This can result in an endless req - nak loop if peer 2968 * doesn't want to send us his address. Q: What should we do 2969 * about it? XXX A: implement the max-failure counter. 2970 */ 2971 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2972 buf[0] = IPCP_OPT_ADDRESS; 2973 buf[1] = 6; 2974 buf[2] = hisaddr >> 24; 2975 buf[3] = hisaddr >> 16; 2976 buf[4] = hisaddr >> 8; 2977 buf[5] = hisaddr; 2978 rlen = 6; 2979 if (debug) 2980 addlog(" still need hisaddr"); 2981 } 2982 2983 if (rlen) { 2984 if (debug) 2985 addlog(" send conf-nak\n"); 2986 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2987 } else { 2988 if (debug) 2989 addlog(" send conf-ack\n"); 2990 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2991 } 2992 2993 end: 2994 free(buf, M_TEMP); 2995 return (rlen == 0); 2996 2997 drop: 2998 free(buf, M_TEMP); 2999 return -1; 3000 } 3001 3002 /* 3003 * Analyze the IPCP Configure-Reject option list, and adjust our 3004 * negotiation. 3005 */ 3006 static void 3007 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3008 { 3009 u_char *buf, *p; 3010 struct ifnet *ifp = &sp->pp_if; 3011 int debug = ifp->if_flags & IFF_DEBUG; 3012 3013 len -= 4; 3014 buf = malloc (len, M_TEMP, M_NOWAIT); 3015 if (!buf) 3016 return; 3017 3018 if (debug) 3019 log(LOG_DEBUG, "%s: ipcp rej opts:", 3020 ifp->if_xname); 3021 3022 p = (void *)(h + 1); 3023 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3024 /* Sanity check option length */ 3025 if (p[1] > len) { 3026 /* XXX should we just RXJ? */ 3027 addlog("%s: malicious IPCP option received, dropping\n", 3028 ifp->if_xname); 3029 goto drop; 3030 } 3031 if (debug) 3032 addlog(" %s", sppp_ipcp_opt_name(*p)); 3033 switch (*p) { 3034 case IPCP_OPT_ADDRESS: 3035 /* 3036 * Peer doesn't grok address option. This is 3037 * bad. XXX Should we better give up here? 3038 */ 3039 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3040 break; 3041 #ifdef notyet 3042 case IPCP_OPT_COMPRESS: 3043 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3044 break; 3045 #endif 3046 } 3047 } 3048 if (debug) 3049 addlog("\n"); 3050 drop: 3051 free(buf, M_TEMP); 3052 return; 3053 } 3054 3055 /* 3056 * Analyze the IPCP Configure-NAK option list, and adjust our 3057 * negotiation. 3058 */ 3059 static void 3060 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3061 { 3062 u_char *p; 3063 struct ifnet *ifp = &sp->pp_if; 3064 int debug = ifp->if_flags & IFF_DEBUG; 3065 uint32_t wantaddr; 3066 3067 len -= 4; 3068 3069 if (debug) 3070 log(LOG_DEBUG, "%s: ipcp nak opts:", 3071 ifp->if_xname); 3072 3073 p = (void *)(h + 1); 3074 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3075 /* Sanity check option length */ 3076 if (p[1] > len) { 3077 /* XXX should we just RXJ? */ 3078 addlog("%s: malicious IPCP option received, dropping\n", 3079 ifp->if_xname); 3080 return; 3081 } 3082 if (debug) 3083 addlog(" %s", sppp_ipcp_opt_name(*p)); 3084 switch (*p) { 3085 case IPCP_OPT_ADDRESS: 3086 /* 3087 * Peer doesn't like our local IP address. See 3088 * if we can do something for him. We'll drop 3089 * him our address then. 3090 */ 3091 if (len >= 6 && p[1] == 6) { 3092 wantaddr = p[2] << 24 | p[3] << 16 | 3093 p[4] << 8 | p[5]; 3094 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3095 if (debug) 3096 addlog(" [wantaddr %s]", 3097 sppp_dotted_quad(wantaddr)); 3098 /* 3099 * When doing dynamic address assignment, 3100 * we accept his offer. Otherwise, we 3101 * ignore it and thus continue to negotiate 3102 * our already existing value. 3103 */ 3104 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3105 if (debug) 3106 addlog(" [agree]"); 3107 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3108 sp->ipcp.req_myaddr = wantaddr; 3109 } 3110 } 3111 break; 3112 3113 case IPCP_OPT_PRIMDNS: 3114 if (len >= 6 && p[1] == 6) { 3115 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3116 p[4] << 8 | p[5]; 3117 } 3118 break; 3119 3120 case IPCP_OPT_SECDNS: 3121 if (len >= 6 && p[1] == 6) { 3122 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3123 p[4] << 8 | p[5]; 3124 } 3125 break; 3126 #ifdef notyet 3127 case IPCP_OPT_COMPRESS: 3128 /* 3129 * Peer wants different compression parameters. 3130 */ 3131 break; 3132 #endif 3133 } 3134 } 3135 if (debug) 3136 addlog("\n"); 3137 } 3138 3139 static void 3140 sppp_ipcp_tlu(struct sppp *sp) 3141 { 3142 #ifdef INET 3143 /* we are up. Set addresses and notify anyone interested */ 3144 STDDCL; 3145 uint32_t myaddr, hisaddr; 3146 3147 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3148 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3149 myaddr = sp->ipcp.req_myaddr; 3150 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3151 hisaddr = sp->ipcp.req_hisaddr; 3152 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3153 3154 if (ifp->if_mtu > sp->lcp.their_mru) { 3155 sp->pp_saved_mtu = ifp->if_mtu; 3156 ifp->if_mtu = sp->lcp.their_mru; 3157 if (debug) 3158 log(LOG_DEBUG, 3159 "%s: setting MTU to %" PRIu64 " bytes\n", 3160 ifp->if_xname, ifp->if_mtu); 3161 } 3162 3163 if (sp->pp_con) 3164 sp->pp_con(sp); 3165 #endif 3166 } 3167 3168 static void 3169 sppp_ipcp_tld(struct sppp *sp) 3170 { 3171 } 3172 3173 static void 3174 sppp_ipcp_tls(struct sppp *sp) 3175 { 3176 /* indicate to LCP that it must stay alive */ 3177 sp->lcp.protos |= (1 << IDX_IPCP); 3178 } 3179 3180 static void 3181 sppp_ipcp_tlf(struct sppp *sp) 3182 { 3183 /* we no longer need LCP */ 3184 sp->lcp.protos &= ~(1 << IDX_IPCP); 3185 } 3186 3187 static void 3188 sppp_ipcp_scr(struct sppp *sp) 3189 { 3190 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3191 #ifdef INET 3192 uint32_t ouraddr; 3193 #endif 3194 int i = 0; 3195 3196 #ifdef notyet 3197 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3198 opt[i++] = IPCP_OPT_COMPRESSION; 3199 opt[i++] = 6; 3200 opt[i++] = 0; /* VJ header compression */ 3201 opt[i++] = 0x2d; /* VJ header compression */ 3202 opt[i++] = max_slot_id; 3203 opt[i++] = comp_slot_id; 3204 } 3205 #endif 3206 3207 #ifdef INET 3208 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3209 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3210 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3211 else 3212 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3213 opt[i++] = IPCP_OPT_ADDRESS; 3214 opt[i++] = 6; 3215 opt[i++] = ouraddr >> 24; 3216 opt[i++] = ouraddr >> 16; 3217 opt[i++] = ouraddr >> 8; 3218 opt[i++] = ouraddr; 3219 } 3220 #endif 3221 3222 if (sp->query_dns & 1) { 3223 opt[i++] = IPCP_OPT_PRIMDNS; 3224 opt[i++] = 6; 3225 opt[i++] = sp->dns_addrs[0] >> 24; 3226 opt[i++] = sp->dns_addrs[0] >> 16; 3227 opt[i++] = sp->dns_addrs[0] >> 8; 3228 opt[i++] = sp->dns_addrs[0]; 3229 } 3230 if (sp->query_dns & 2) { 3231 opt[i++] = IPCP_OPT_SECDNS; 3232 opt[i++] = 6; 3233 opt[i++] = sp->dns_addrs[1] >> 24; 3234 opt[i++] = sp->dns_addrs[1] >> 16; 3235 opt[i++] = sp->dns_addrs[1] >> 8; 3236 opt[i++] = sp->dns_addrs[1]; 3237 } 3238 3239 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3240 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3241 } 3242 3243 3244 /* 3245 *--------------------------------------------------------------------------* 3246 * * 3247 * The IPv6CP implementation. * 3248 * * 3249 *--------------------------------------------------------------------------* 3250 */ 3251 3252 #ifdef INET6 3253 static void 3254 sppp_ipv6cp_init(struct sppp *sp) 3255 { 3256 sp->ipv6cp.opts = 0; 3257 sp->ipv6cp.flags = 0; 3258 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3259 sp->fail_counter[IDX_IPV6CP] = 0; 3260 sp->pp_seq[IDX_IPV6CP] = 0; 3261 sp->pp_rseq[IDX_IPV6CP] = 0; 3262 callout_init(&sp->ch[IDX_IPV6CP], 0); 3263 } 3264 3265 static void 3266 sppp_ipv6cp_up(struct sppp *sp) 3267 { 3268 sppp_up_event(&ipv6cp, sp); 3269 } 3270 3271 static void 3272 sppp_ipv6cp_down(struct sppp *sp) 3273 { 3274 sppp_down_event(&ipv6cp, sp); 3275 } 3276 3277 static void 3278 sppp_ipv6cp_open(struct sppp *sp) 3279 { 3280 STDDCL; 3281 struct in6_addr myaddr, hisaddr; 3282 3283 #ifdef IPV6CP_MYIFID_DYN 3284 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3285 #else 3286 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3287 #endif 3288 3289 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3290 /* 3291 * If we don't have our address, this probably means our 3292 * interface doesn't want to talk IPv6 at all. (This could 3293 * be the case if somebody wants to speak only IPX, for 3294 * example.) Don't open IPv6CP in this case. 3295 */ 3296 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3297 /* XXX this message should go away */ 3298 if (debug) 3299 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3300 ifp->if_xname); 3301 return; 3302 } 3303 3304 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3305 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3306 sppp_open_event(&ipv6cp, sp); 3307 } 3308 3309 static void 3310 sppp_ipv6cp_close(struct sppp *sp) 3311 { 3312 sppp_close_event(&ipv6cp, sp); 3313 } 3314 3315 static void 3316 sppp_ipv6cp_TO(void *cookie) 3317 { 3318 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3319 } 3320 3321 /* 3322 * Analyze a configure request. Return true if it was agreeable, and 3323 * caused action sca, false if it has been rejected or nak'ed, and 3324 * caused action scn. (The return value is used to make the state 3325 * transition decision in the state automaton.) 3326 */ 3327 static int 3328 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3329 { 3330 u_char *buf, *r, *p; 3331 struct ifnet *ifp = &sp->pp_if; 3332 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3333 struct in6_addr myaddr, desiredaddr, suggestaddr; 3334 int ifidcount; 3335 int type; 3336 int collision, nohisaddr; 3337 3338 len -= 4; 3339 origlen = len; 3340 /* 3341 * Make sure to allocate a buf that can at least hold a 3342 * conf-nak with an `address' option. We might need it below. 3343 */ 3344 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3345 if (! buf) 3346 return (0); 3347 3348 /* pass 1: see if we can recognize them */ 3349 if (debug) 3350 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3351 ifp->if_xname); 3352 p = (void *)(h + 1); 3353 ifidcount = 0; 3354 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3355 /* Sanity check option length */ 3356 if (p[1] > len) { 3357 /* XXX just RXJ? */ 3358 addlog("%s: received malicious IPCPv6 option, " 3359 "dropping\n", ifp->if_xname); 3360 goto drop; 3361 } 3362 if (debug) 3363 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3364 switch (*p) { 3365 case IPV6CP_OPT_IFID: 3366 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3367 /* correctly formed address option */ 3368 ifidcount++; 3369 continue; 3370 } 3371 if (debug) 3372 addlog(" [invalid]"); 3373 break; 3374 #ifdef notyet 3375 case IPV6CP_OPT_COMPRESSION: 3376 if (len >= 4 && p[1] >= 4) { 3377 /* correctly formed compress option */ 3378 continue; 3379 } 3380 if (debug) 3381 addlog(" [invalid]"); 3382 break; 3383 #endif 3384 default: 3385 /* Others not supported. */ 3386 if (debug) 3387 addlog(" [rej]"); 3388 break; 3389 } 3390 /* Add the option to rejected list. */ 3391 bcopy (p, r, p[1]); 3392 r += p[1]; 3393 rlen += p[1]; 3394 } 3395 if (rlen) { 3396 if (debug) 3397 addlog(" send conf-rej\n"); 3398 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3399 goto end; 3400 } else if (debug) 3401 addlog("\n"); 3402 3403 /* pass 2: parse option values */ 3404 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3405 if (debug) 3406 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3407 ifp->if_xname); 3408 p = (void *)(h + 1); 3409 len = origlen; 3410 type = CONF_ACK; 3411 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3412 if (debug) 3413 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3414 switch (*p) { 3415 #ifdef notyet 3416 case IPV6CP_OPT_COMPRESSION: 3417 continue; 3418 #endif 3419 case IPV6CP_OPT_IFID: 3420 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3421 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3422 collision = (memcmp(&desiredaddr.s6_addr[8], 3423 &myaddr.s6_addr[8], 8) == 0); 3424 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3425 3426 desiredaddr.s6_addr16[0] = htons(0xfe80); 3427 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3428 3429 if (!collision && !nohisaddr) { 3430 /* no collision, hisaddr known - Conf-Ack */ 3431 type = CONF_ACK; 3432 3433 if (debug) { 3434 addlog(" %s [%s]", 3435 ip6_sprintf(&desiredaddr), 3436 sppp_cp_type_name(type)); 3437 } 3438 continue; 3439 } 3440 3441 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3442 if (collision && nohisaddr) { 3443 /* collision, hisaddr unknown - Conf-Rej */ 3444 type = CONF_REJ; 3445 memset(&p[2], 0, 8); 3446 } else { 3447 /* 3448 * - no collision, hisaddr unknown, or 3449 * - collision, hisaddr known 3450 * Conf-Nak, suggest hisaddr 3451 */ 3452 type = CONF_NAK; 3453 sppp_suggest_ip6_addr(sp, &suggestaddr); 3454 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3455 } 3456 if (debug) 3457 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3458 sppp_cp_type_name(type)); 3459 break; 3460 } 3461 /* Add the option to nak'ed list. */ 3462 bcopy (p, r, p[1]); 3463 r += p[1]; 3464 rlen += p[1]; 3465 } 3466 3467 if (rlen == 0 && type == CONF_ACK) { 3468 if (debug) 3469 addlog(" send %s\n", sppp_cp_type_name(type)); 3470 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3471 } else { 3472 #ifdef notdef 3473 if (type == CONF_ACK) 3474 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3475 #endif 3476 3477 if (debug) { 3478 addlog(" send %s suggest %s\n", 3479 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3480 } 3481 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3482 } 3483 3484 end: 3485 free(buf, M_TEMP); 3486 return (rlen == 0); 3487 3488 drop: 3489 free(buf, M_TEMP); 3490 return -1; 3491 } 3492 3493 /* 3494 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3495 * negotiation. 3496 */ 3497 static void 3498 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3499 { 3500 u_char *buf, *p; 3501 struct ifnet *ifp = &sp->pp_if; 3502 int debug = ifp->if_flags & IFF_DEBUG; 3503 3504 len -= 4; 3505 buf = malloc (len, M_TEMP, M_NOWAIT); 3506 if (!buf) 3507 return; 3508 3509 if (debug) 3510 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3511 ifp->if_xname); 3512 3513 p = (void *)(h + 1); 3514 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3515 if (p[1] > len) { 3516 /* XXX just RXJ? */ 3517 addlog("%s: received malicious IPCPv6 option, " 3518 "dropping\n", ifp->if_xname); 3519 goto drop; 3520 } 3521 if (debug) 3522 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3523 switch (*p) { 3524 case IPV6CP_OPT_IFID: 3525 /* 3526 * Peer doesn't grok address option. This is 3527 * bad. XXX Should we better give up here? 3528 */ 3529 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3530 break; 3531 #ifdef notyet 3532 case IPV6CP_OPT_COMPRESS: 3533 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3534 break; 3535 #endif 3536 } 3537 } 3538 if (debug) 3539 addlog("\n"); 3540 drop: 3541 free(buf, M_TEMP); 3542 return; 3543 } 3544 3545 /* 3546 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3547 * negotiation. 3548 */ 3549 static void 3550 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3551 { 3552 u_char *buf, *p; 3553 struct ifnet *ifp = &sp->pp_if; 3554 int debug = ifp->if_flags & IFF_DEBUG; 3555 struct in6_addr suggestaddr; 3556 3557 len -= 4; 3558 buf = malloc (len, M_TEMP, M_NOWAIT); 3559 if (!buf) 3560 return; 3561 3562 if (debug) 3563 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3564 ifp->if_xname); 3565 3566 p = (void *)(h + 1); 3567 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3568 if (p[1] > len) { 3569 /* XXX just RXJ? */ 3570 addlog("%s: received malicious IPCPv6 option, " 3571 "dropping\n", ifp->if_xname); 3572 goto drop; 3573 } 3574 if (debug) 3575 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3576 switch (*p) { 3577 case IPV6CP_OPT_IFID: 3578 /* 3579 * Peer doesn't like our local ifid. See 3580 * if we can do something for him. We'll drop 3581 * him our address then. 3582 */ 3583 if (len < 10 || p[1] != 10) 3584 break; 3585 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3586 suggestaddr.s6_addr16[0] = htons(0xfe80); 3587 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3588 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3589 3590 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3591 if (debug) 3592 addlog(" [suggestaddr %s]", 3593 ip6_sprintf(&suggestaddr)); 3594 #ifdef IPV6CP_MYIFID_DYN 3595 /* 3596 * When doing dynamic address assignment, 3597 * we accept his offer. 3598 */ 3599 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3600 struct in6_addr lastsuggest; 3601 /* 3602 * If <suggested myaddr from peer> equals to 3603 * <hisaddr we have suggested last time>, 3604 * we have a collision. generate new random 3605 * ifid. 3606 */ 3607 sppp_suggest_ip6_addr(&lastsuggest); 3608 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3609 lastsuggest)) { 3610 if (debug) 3611 addlog(" [random]"); 3612 sppp_gen_ip6_addr(sp, &suggestaddr); 3613 } 3614 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3615 if (debug) 3616 addlog(" [agree]"); 3617 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3618 } 3619 #else 3620 /* 3621 * Since we do not do dynamic address assignment, 3622 * we ignore it and thus continue to negotiate 3623 * our already existing value. This can possibly 3624 * go into infinite request-reject loop. 3625 * 3626 * This is not likely because we normally use 3627 * ifid based on MAC-address. 3628 * If you have no ethernet card on the node, too bad. 3629 * XXX should we use fail_counter? 3630 */ 3631 #endif 3632 break; 3633 #ifdef notyet 3634 case IPV6CP_OPT_COMPRESS: 3635 /* 3636 * Peer wants different compression parameters. 3637 */ 3638 break; 3639 #endif 3640 } 3641 } 3642 if (debug) 3643 addlog("\n"); 3644 drop: 3645 free(buf, M_TEMP); 3646 return; 3647 } 3648 3649 static void 3650 sppp_ipv6cp_tlu(struct sppp *sp) 3651 { 3652 /* we are up - notify isdn daemon */ 3653 if (sp->pp_con) 3654 sp->pp_con(sp); 3655 } 3656 3657 static void 3658 sppp_ipv6cp_tld(struct sppp *sp) 3659 { 3660 } 3661 3662 static void 3663 sppp_ipv6cp_tls(struct sppp *sp) 3664 { 3665 /* indicate to LCP that it must stay alive */ 3666 sp->lcp.protos |= (1 << IDX_IPV6CP); 3667 } 3668 3669 static void 3670 sppp_ipv6cp_tlf(struct sppp *sp) 3671 { 3672 /* we no longer need LCP */ 3673 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3674 } 3675 3676 static void 3677 sppp_ipv6cp_scr(struct sppp *sp) 3678 { 3679 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3680 struct in6_addr ouraddr; 3681 int i = 0; 3682 3683 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3684 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3685 opt[i++] = IPV6CP_OPT_IFID; 3686 opt[i++] = 10; 3687 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3688 i += 8; 3689 } 3690 3691 #ifdef notyet 3692 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3693 opt[i++] = IPV6CP_OPT_COMPRESSION; 3694 opt[i++] = 4; 3695 opt[i++] = 0; /* TBD */ 3696 opt[i++] = 0; /* TBD */ 3697 /* variable length data may follow */ 3698 } 3699 #endif 3700 3701 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3702 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3703 } 3704 #else /*INET6*/ 3705 static void 3706 sppp_ipv6cp_init(struct sppp *sp) 3707 { 3708 } 3709 3710 static void 3711 sppp_ipv6cp_up(struct sppp *sp) 3712 { 3713 } 3714 3715 static void 3716 sppp_ipv6cp_down(struct sppp *sp) 3717 { 3718 } 3719 3720 static void 3721 sppp_ipv6cp_open(struct sppp *sp) 3722 { 3723 } 3724 3725 static void 3726 sppp_ipv6cp_close(struct sppp *sp) 3727 { 3728 } 3729 3730 static void 3731 sppp_ipv6cp_TO(void *sp) 3732 { 3733 } 3734 3735 static int 3736 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3737 int len) 3738 { 3739 return 0; 3740 } 3741 3742 static void 3743 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3744 int len) 3745 { 3746 } 3747 3748 static void 3749 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3750 int len) 3751 { 3752 } 3753 3754 static void 3755 sppp_ipv6cp_tlu(struct sppp *sp) 3756 { 3757 } 3758 3759 static void 3760 sppp_ipv6cp_tld(struct sppp *sp) 3761 { 3762 } 3763 3764 static void 3765 sppp_ipv6cp_tls(struct sppp *sp) 3766 { 3767 } 3768 3769 static void 3770 sppp_ipv6cp_tlf(struct sppp *sp) 3771 { 3772 } 3773 3774 static void 3775 sppp_ipv6cp_scr(struct sppp *sp) 3776 { 3777 } 3778 #endif /*INET6*/ 3779 3780 3781 /* 3782 *--------------------------------------------------------------------------* 3783 * * 3784 * The CHAP implementation. * 3785 * * 3786 *--------------------------------------------------------------------------* 3787 */ 3788 3789 /* 3790 * The authentication protocols don't employ a full-fledged state machine as 3791 * the control protocols do, since they do have Open and Close events, but 3792 * not Up and Down, nor are they explicitly terminated. Also, use of the 3793 * authentication protocols may be different in both directions (this makes 3794 * sense, think of a machine that never accepts incoming calls but only 3795 * calls out, it doesn't require the called party to authenticate itself). 3796 * 3797 * Our state machine for the local authentication protocol (we are requesting 3798 * the peer to authenticate) looks like: 3799 * 3800 * RCA- 3801 * +--------------------------------------------+ 3802 * V scn,tld| 3803 * +--------+ Close +---------+ RCA+ 3804 * | |<----------------------------------| |------+ 3805 * +--->| Closed | TO* | Opened | sca | 3806 * | | |-----+ +-------| |<-----+ 3807 * | +--------+ irc | | +---------+ 3808 * | ^ | | ^ 3809 * | | | | | 3810 * | | | | | 3811 * | TO-| | | | 3812 * | |tld TO+ V | | 3813 * | | +------->+ | | 3814 * | | | | | | 3815 * | +--------+ V | | 3816 * | | |<----+<--------------------+ | 3817 * | | Req- | scr | 3818 * | | Sent | | 3819 * | | | | 3820 * | +--------+ | 3821 * | RCA- | | RCA+ | 3822 * +------+ +------------------------------------------+ 3823 * scn,tld sca,irc,ict,tlu 3824 * 3825 * 3826 * with: 3827 * 3828 * Open: LCP reached authentication phase 3829 * Close: LCP reached terminate phase 3830 * 3831 * RCA+: received reply (pap-req, chap-response), acceptable 3832 * RCN: received reply (pap-req, chap-response), not acceptable 3833 * TO+: timeout with restart counter >= 0 3834 * TO-: timeout with restart counter < 0 3835 * TO*: reschedule timeout for CHAP 3836 * 3837 * scr: send request packet (none for PAP, chap-challenge) 3838 * sca: send ack packet (pap-ack, chap-success) 3839 * scn: send nak packet (pap-nak, chap-failure) 3840 * ict: initialize re-challenge timer (CHAP only) 3841 * 3842 * tlu: this-layer-up, LCP reaches network phase 3843 * tld: this-layer-down, LCP enters terminate phase 3844 * 3845 * Note that in CHAP mode, after sending a new challenge, while the state 3846 * automaton falls back into Req-Sent state, it doesn't signal a tld 3847 * event to LCP, so LCP remains in network phase. Only after not getting 3848 * any response (or after getting an unacceptable response), CHAP closes, 3849 * causing LCP to enter terminate phase. 3850 * 3851 * With PAP, there is no initial request that can be sent. The peer is 3852 * expected to send one based on the successful negotiation of PAP as 3853 * the authentication protocol during the LCP option negotiation. 3854 * 3855 * Incoming authentication protocol requests (remote requests 3856 * authentication, we are peer) don't employ a state machine at all, 3857 * they are simply answered. Some peers [Ascend P50 firmware rev 3858 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3859 * still in authentication phase (thereby violating the standard that 3860 * demands that these NCP packets are to be discarded), so we keep 3861 * track of the peer demanding us to authenticate, and only proceed to 3862 * phase network once we've seen a positive acknowledge for the 3863 * authentication. 3864 */ 3865 3866 /* 3867 * Handle incoming CHAP packets. 3868 */ 3869 void 3870 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3871 { 3872 STDDCL; 3873 struct lcp_header *h; 3874 int len, x; 3875 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3876 int value_len, name_len; 3877 MD5_CTX ctx; 3878 3879 len = m->m_pkthdr.len; 3880 if (len < 4) { 3881 if (debug) 3882 log(LOG_DEBUG, 3883 "%s: chap invalid packet length: %d bytes\n", 3884 ifp->if_xname, len); 3885 return; 3886 } 3887 h = mtod(m, struct lcp_header *); 3888 if (len > ntohs(h->len)) 3889 len = ntohs(h->len); 3890 3891 switch (h->type) { 3892 /* challenge, failure and success are his authproto */ 3893 case CHAP_CHALLENGE: 3894 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3895 /* can't do anything useful */ 3896 sp->pp_auth_failures++; 3897 printf("%s: chap input without my name and my secret being set\n", 3898 ifp->if_xname); 3899 break; 3900 } 3901 value = 1 + (u_char *)(h + 1); 3902 value_len = value[-1]; 3903 name = value + value_len; 3904 name_len = len - value_len - 5; 3905 if (name_len < 0) { 3906 if (debug) { 3907 log(LOG_DEBUG, 3908 "%s: chap corrupted challenge " 3909 "<%s id=0x%x len=%d", 3910 ifp->if_xname, 3911 sppp_auth_type_name(PPP_CHAP, h->type), 3912 h->ident, ntohs(h->len)); 3913 if (len > 4) 3914 sppp_print_bytes((u_char *)(h + 1), 3915 len - 4); 3916 addlog(">\n"); 3917 } 3918 break; 3919 } 3920 3921 if (debug) { 3922 log(LOG_DEBUG, 3923 "%s: chap input <%s id=0x%x len=%d name=", 3924 ifp->if_xname, 3925 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3926 ntohs(h->len)); 3927 sppp_print_string((char *) name, name_len); 3928 addlog(" value-size=%d value=", value_len); 3929 sppp_print_bytes(value, value_len); 3930 addlog(">\n"); 3931 } 3932 3933 /* Compute reply value. */ 3934 MD5Init(&ctx); 3935 MD5Update(&ctx, &h->ident, 1); 3936 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3937 MD5Update(&ctx, value, value_len); 3938 MD5Final(digest, &ctx); 3939 dsize = sizeof digest; 3940 3941 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3942 sizeof dsize, (const char *)&dsize, 3943 sizeof digest, digest, 3944 sp->myauth.name_len, 3945 sp->myauth.name, 3946 0); 3947 break; 3948 3949 case CHAP_SUCCESS: 3950 if (debug) { 3951 log(LOG_DEBUG, "%s: chap success", 3952 ifp->if_xname); 3953 if (len > 4) { 3954 addlog(": "); 3955 sppp_print_string((char *)(h + 1), len - 4); 3956 } 3957 addlog("\n"); 3958 } 3959 x = splnet(); 3960 sp->pp_auth_failures = 0; 3961 sp->pp_flags &= ~PP_NEEDAUTH; 3962 if (sp->myauth.proto == PPP_CHAP && 3963 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3964 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3965 /* 3966 * We are authenticator for CHAP but didn't 3967 * complete yet. Leave it to tlu to proceed 3968 * to network phase. 3969 */ 3970 splx(x); 3971 break; 3972 } 3973 splx(x); 3974 sppp_phase_network(sp); 3975 break; 3976 3977 case CHAP_FAILURE: 3978 x = splnet(); 3979 sp->pp_auth_failures++; 3980 splx(x); 3981 if (debug) { 3982 log(LOG_INFO, "%s: chap failure", 3983 ifp->if_xname); 3984 if (len > 4) { 3985 addlog(": "); 3986 sppp_print_string((char *)(h + 1), len - 4); 3987 } 3988 addlog("\n"); 3989 } else 3990 log(LOG_INFO, "%s: chap failure\n", 3991 ifp->if_xname); 3992 /* await LCP shutdown by authenticator */ 3993 break; 3994 3995 /* response is my authproto */ 3996 case CHAP_RESPONSE: 3997 if (sp->hisauth.secret == NULL) { 3998 /* can't do anything useful */ 3999 printf("%s: chap input without his secret being set\n", 4000 ifp->if_xname); 4001 break; 4002 } 4003 value = 1 + (u_char *)(h + 1); 4004 value_len = value[-1]; 4005 name = value + value_len; 4006 name_len = len - value_len - 5; 4007 if (name_len < 0) { 4008 if (debug) { 4009 log(LOG_DEBUG, 4010 "%s: chap corrupted response " 4011 "<%s id=0x%x len=%d", 4012 ifp->if_xname, 4013 sppp_auth_type_name(PPP_CHAP, h->type), 4014 h->ident, ntohs(h->len)); 4015 if (len > 4) 4016 sppp_print_bytes((u_char *)(h + 1), 4017 len - 4); 4018 addlog(">\n"); 4019 } 4020 break; 4021 } 4022 if (h->ident != sp->confid[IDX_CHAP]) { 4023 if (debug) 4024 log(LOG_DEBUG, 4025 "%s: chap dropping response for old ID " 4026 "(got %d, expected %d)\n", 4027 ifp->if_xname, 4028 h->ident, sp->confid[IDX_CHAP]); 4029 break; 4030 } 4031 if (sp->hisauth.name != NULL && 4032 (name_len != sp->hisauth.name_len 4033 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4034 log(LOG_INFO, "%s: chap response, his name ", 4035 ifp->if_xname); 4036 sppp_print_string(name, name_len); 4037 addlog(" != expected "); 4038 sppp_print_string(sp->hisauth.name, 4039 sp->hisauth.name_len); 4040 addlog("\n"); 4041 goto chap_failure; 4042 } 4043 if (debug) { 4044 log(LOG_DEBUG, "%s: chap input(%s) " 4045 "<%s id=0x%x len=%d name=", 4046 ifp->if_xname, 4047 sppp_state_name(sp->state[IDX_CHAP]), 4048 sppp_auth_type_name(PPP_CHAP, h->type), 4049 h->ident, ntohs(h->len)); 4050 sppp_print_string((char *)name, name_len); 4051 addlog(" value-size=%d value=", value_len); 4052 sppp_print_bytes(value, value_len); 4053 addlog(">\n"); 4054 } 4055 if (value_len != sizeof(sp->myauth.challenge)) { 4056 if (debug) 4057 log(LOG_DEBUG, 4058 "%s: chap bad hash value length: " 4059 "%d bytes, should be %ld\n", 4060 ifp->if_xname, value_len, 4061 (long) sizeof(sp->myauth.challenge)); 4062 goto chap_failure; 4063 } 4064 4065 MD5Init(&ctx); 4066 MD5Update(&ctx, &h->ident, 1); 4067 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4068 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4069 MD5Final(digest, &ctx); 4070 4071 #define FAILMSG "Failed..." 4072 #define SUCCMSG "Welcome!" 4073 4074 if (value_len != sizeof digest || 4075 memcmp(digest, value, value_len) != 0) { 4076 chap_failure: 4077 /* action scn, tld */ 4078 x = splnet(); 4079 sp->pp_auth_failures++; 4080 splx(x); 4081 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4082 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4083 0); 4084 chap.tld(sp); 4085 break; 4086 } 4087 sp->pp_auth_failures = 0; 4088 /* action sca, perhaps tlu */ 4089 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4090 sp->state[IDX_CHAP] == STATE_OPENED) 4091 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4092 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4093 0); 4094 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4095 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4096 chap.tlu(sp); 4097 } 4098 break; 4099 4100 default: 4101 /* Unknown CHAP packet type -- ignore. */ 4102 if (debug) { 4103 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4104 "<0x%x id=0x%xh len=%d", 4105 ifp->if_xname, 4106 sppp_state_name(sp->state[IDX_CHAP]), 4107 h->type, h->ident, ntohs(h->len)); 4108 if (len > 4) 4109 sppp_print_bytes((u_char *)(h + 1), len - 4); 4110 addlog(">\n"); 4111 } 4112 break; 4113 4114 } 4115 } 4116 4117 static void 4118 sppp_chap_init(struct sppp *sp) 4119 { 4120 /* Chap doesn't have STATE_INITIAL at all. */ 4121 sp->state[IDX_CHAP] = STATE_CLOSED; 4122 sp->fail_counter[IDX_CHAP] = 0; 4123 sp->pp_seq[IDX_CHAP] = 0; 4124 sp->pp_rseq[IDX_CHAP] = 0; 4125 callout_init(&sp->ch[IDX_CHAP], 0); 4126 } 4127 4128 static void 4129 sppp_chap_open(struct sppp *sp) 4130 { 4131 if (sp->myauth.proto == PPP_CHAP && 4132 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4133 /* we are authenticator for CHAP, start it */ 4134 chap.scr(sp); 4135 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4136 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4137 } 4138 /* nothing to be done if we are peer, await a challenge */ 4139 } 4140 4141 static void 4142 sppp_chap_close(struct sppp *sp) 4143 { 4144 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4145 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4146 } 4147 4148 static void 4149 sppp_chap_TO(void *cookie) 4150 { 4151 struct sppp *sp = (struct sppp *)cookie; 4152 STDDCL; 4153 int s; 4154 4155 s = splnet(); 4156 if (debug) 4157 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4158 ifp->if_xname, 4159 sppp_state_name(sp->state[IDX_CHAP]), 4160 sp->rst_counter[IDX_CHAP]); 4161 4162 if (--sp->rst_counter[IDX_CHAP] < 0) 4163 /* TO- event */ 4164 switch (sp->state[IDX_CHAP]) { 4165 case STATE_REQ_SENT: 4166 chap.tld(sp); 4167 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4168 break; 4169 } 4170 else 4171 /* TO+ (or TO*) event */ 4172 switch (sp->state[IDX_CHAP]) { 4173 case STATE_OPENED: 4174 /* TO* event */ 4175 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4176 /* fall through */ 4177 case STATE_REQ_SENT: 4178 chap.scr(sp); 4179 /* sppp_cp_change_state() will restart the timer */ 4180 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4181 break; 4182 } 4183 4184 splx(s); 4185 } 4186 4187 static void 4188 sppp_chap_tlu(struct sppp *sp) 4189 { 4190 STDDCL; 4191 int i, x; 4192 4193 i = 0; 4194 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4195 4196 /* 4197 * Some broken CHAP implementations (Conware CoNet, firmware 4198 * 4.0.?) don't want to re-authenticate their CHAP once the 4199 * initial challenge-response exchange has taken place. 4200 * Provide for an option to avoid rechallenges. 4201 */ 4202 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4203 /* 4204 * Compute the re-challenge timeout. This will yield 4205 * a number between 300 and 810 seconds. 4206 */ 4207 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4208 4209 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4210 } 4211 4212 if (debug) { 4213 log(LOG_DEBUG, 4214 "%s: chap %s, ", 4215 ifp->if_xname, 4216 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4217 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4218 addlog("next re-challenge in %d seconds\n", i); 4219 else 4220 addlog("re-challenging supressed\n"); 4221 } 4222 4223 x = splnet(); 4224 sp->pp_auth_failures = 0; 4225 /* indicate to LCP that we need to be closed down */ 4226 sp->lcp.protos |= (1 << IDX_CHAP); 4227 4228 if (sp->pp_flags & PP_NEEDAUTH) { 4229 /* 4230 * Remote is authenticator, but his auth proto didn't 4231 * complete yet. Defer the transition to network 4232 * phase. 4233 */ 4234 splx(x); 4235 return; 4236 } 4237 splx(x); 4238 4239 /* 4240 * If we are already in phase network, we are done here. This 4241 * is the case if this is a dummy tlu event after a re-challenge. 4242 */ 4243 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4244 sppp_phase_network(sp); 4245 } 4246 4247 static void 4248 sppp_chap_tld(struct sppp *sp) 4249 { 4250 STDDCL; 4251 4252 if (debug) 4253 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4254 callout_stop(&sp->ch[IDX_CHAP]); 4255 sp->lcp.protos &= ~(1 << IDX_CHAP); 4256 4257 lcp.Close(sp); 4258 } 4259 4260 static void 4261 sppp_chap_scr(struct sppp *sp) 4262 { 4263 uint32_t *ch; 4264 u_char clen = 4 * sizeof(uint32_t); 4265 4266 if (sp->myauth.name == NULL) { 4267 /* can't do anything useful */ 4268 printf("%s: chap starting without my name being set\n", 4269 sp->pp_if.if_xname); 4270 return; 4271 } 4272 4273 /* Compute random challenge. */ 4274 ch = (uint32_t *)sp->myauth.challenge; 4275 cprng_strong(kern_cprng, ch, clen, 0); 4276 4277 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4278 4279 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4280 sizeof clen, (const char *)&clen, 4281 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4282 sp->myauth.name_len, 4283 sp->myauth.name, 4284 0); 4285 } 4286 4287 /* 4288 *--------------------------------------------------------------------------* 4289 * * 4290 * The PAP implementation. * 4291 * * 4292 *--------------------------------------------------------------------------* 4293 */ 4294 /* 4295 * For PAP, we need to keep a little state also if we are the peer, not the 4296 * authenticator. This is since we don't get a request to authenticate, but 4297 * have to repeatedly authenticate ourself until we got a response (or the 4298 * retry counter is expired). 4299 */ 4300 4301 /* 4302 * Handle incoming PAP packets. */ 4303 static void 4304 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4305 { 4306 STDDCL; 4307 struct lcp_header *h; 4308 int len, x; 4309 u_char mlen; 4310 char *name, *secret; 4311 int name_len, secret_len; 4312 4313 /* 4314 * Malicious input might leave this uninitialized, so 4315 * init to an impossible value. 4316 */ 4317 secret_len = -1; 4318 4319 len = m->m_pkthdr.len; 4320 if (len < 5) { 4321 if (debug) 4322 log(LOG_DEBUG, 4323 "%s: pap invalid packet length: %d bytes\n", 4324 ifp->if_xname, len); 4325 return; 4326 } 4327 h = mtod(m, struct lcp_header *); 4328 if (len > ntohs(h->len)) 4329 len = ntohs(h->len); 4330 switch (h->type) { 4331 /* PAP request is my authproto */ 4332 case PAP_REQ: 4333 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4334 /* can't do anything useful */ 4335 printf("%s: pap request without his name and his secret being set\n", 4336 ifp->if_xname); 4337 break; 4338 } 4339 name = 1 + (u_char *)(h + 1); 4340 name_len = name[-1]; 4341 secret = name + name_len + 1; 4342 if (name_len > len - 6 || 4343 (secret_len = secret[-1]) > len - 6 - name_len) { 4344 if (debug) { 4345 log(LOG_DEBUG, "%s: pap corrupted input " 4346 "<%s id=0x%x len=%d", 4347 ifp->if_xname, 4348 sppp_auth_type_name(PPP_PAP, h->type), 4349 h->ident, ntohs(h->len)); 4350 if (len > 4) 4351 sppp_print_bytes((u_char *)(h + 1), 4352 len - 4); 4353 addlog(">\n"); 4354 } 4355 break; 4356 } 4357 if (debug) { 4358 log(LOG_DEBUG, "%s: pap input(%s) " 4359 "<%s id=0x%x len=%d name=", 4360 ifp->if_xname, 4361 sppp_state_name(sp->state[IDX_PAP]), 4362 sppp_auth_type_name(PPP_PAP, h->type), 4363 h->ident, ntohs(h->len)); 4364 sppp_print_string((char *)name, name_len); 4365 addlog(" secret="); 4366 sppp_print_string((char *)secret, secret_len); 4367 addlog(">\n"); 4368 } 4369 if (name_len != sp->hisauth.name_len || 4370 secret_len != sp->hisauth.secret_len || 4371 memcmp(name, sp->hisauth.name, name_len) != 0 || 4372 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4373 /* action scn, tld */ 4374 sp->pp_auth_failures++; 4375 mlen = sizeof(FAILMSG) - 1; 4376 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4377 sizeof mlen, (const char *)&mlen, 4378 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4379 0); 4380 pap.tld(sp); 4381 break; 4382 } 4383 /* action sca, perhaps tlu */ 4384 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4385 sp->state[IDX_PAP] == STATE_OPENED) { 4386 mlen = sizeof(SUCCMSG) - 1; 4387 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4388 sizeof mlen, (const char *)&mlen, 4389 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4390 0); 4391 } 4392 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4393 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4394 pap.tlu(sp); 4395 } 4396 break; 4397 4398 /* ack and nak are his authproto */ 4399 case PAP_ACK: 4400 callout_stop(&sp->pap_my_to_ch); 4401 if (debug) { 4402 log(LOG_DEBUG, "%s: pap success", 4403 ifp->if_xname); 4404 name = 1 + (u_char *)(h + 1); 4405 name_len = name[-1]; 4406 if (len > 5 && name_len < len+4) { 4407 addlog(": "); 4408 sppp_print_string(name, name_len); 4409 } 4410 addlog("\n"); 4411 } 4412 x = splnet(); 4413 sp->pp_auth_failures = 0; 4414 sp->pp_flags &= ~PP_NEEDAUTH; 4415 if (sp->myauth.proto == PPP_PAP && 4416 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4417 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4418 /* 4419 * We are authenticator for PAP but didn't 4420 * complete yet. Leave it to tlu to proceed 4421 * to network phase. 4422 */ 4423 splx(x); 4424 break; 4425 } 4426 splx(x); 4427 sppp_phase_network(sp); 4428 break; 4429 4430 case PAP_NAK: 4431 callout_stop(&sp->pap_my_to_ch); 4432 sp->pp_auth_failures++; 4433 if (debug) { 4434 log(LOG_INFO, "%s: pap failure", 4435 ifp->if_xname); 4436 name = 1 + (u_char *)(h + 1); 4437 name_len = name[-1]; 4438 if (len > 5 && name_len < len+4) { 4439 addlog(": "); 4440 sppp_print_string(name, name_len); 4441 } 4442 addlog("\n"); 4443 } else 4444 log(LOG_INFO, "%s: pap failure\n", 4445 ifp->if_xname); 4446 /* await LCP shutdown by authenticator */ 4447 break; 4448 4449 default: 4450 /* Unknown PAP packet type -- ignore. */ 4451 if (debug) { 4452 log(LOG_DEBUG, "%s: pap corrupted input " 4453 "<0x%x id=0x%x len=%d", 4454 ifp->if_xname, 4455 h->type, h->ident, ntohs(h->len)); 4456 if (len > 4) 4457 sppp_print_bytes((u_char *)(h + 1), len - 4); 4458 addlog(">\n"); 4459 } 4460 break; 4461 4462 } 4463 } 4464 4465 static void 4466 sppp_pap_init(struct sppp *sp) 4467 { 4468 /* PAP doesn't have STATE_INITIAL at all. */ 4469 sp->state[IDX_PAP] = STATE_CLOSED; 4470 sp->fail_counter[IDX_PAP] = 0; 4471 sp->pp_seq[IDX_PAP] = 0; 4472 sp->pp_rseq[IDX_PAP] = 0; 4473 callout_init(&sp->ch[IDX_PAP], 0); 4474 callout_init(&sp->pap_my_to_ch, 0); 4475 } 4476 4477 static void 4478 sppp_pap_open(struct sppp *sp) 4479 { 4480 if (sp->hisauth.proto == PPP_PAP && 4481 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4482 /* we are authenticator for PAP, start our timer */ 4483 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4484 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4485 } 4486 if (sp->myauth.proto == PPP_PAP) { 4487 /* we are peer, send a request, and start a timer */ 4488 pap.scr(sp); 4489 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4490 sppp_pap_my_TO, sp); 4491 } 4492 } 4493 4494 static void 4495 sppp_pap_close(struct sppp *sp) 4496 { 4497 if (sp->state[IDX_PAP] != STATE_CLOSED) 4498 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4499 } 4500 4501 /* 4502 * That's the timeout routine if we are authenticator. Since the 4503 * authenticator is basically passive in PAP, we can't do much here. 4504 */ 4505 static void 4506 sppp_pap_TO(void *cookie) 4507 { 4508 struct sppp *sp = (struct sppp *)cookie; 4509 STDDCL; 4510 int s; 4511 4512 s = splnet(); 4513 if (debug) 4514 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4515 ifp->if_xname, 4516 sppp_state_name(sp->state[IDX_PAP]), 4517 sp->rst_counter[IDX_PAP]); 4518 4519 if (--sp->rst_counter[IDX_PAP] < 0) 4520 /* TO- event */ 4521 switch (sp->state[IDX_PAP]) { 4522 case STATE_REQ_SENT: 4523 pap.tld(sp); 4524 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4525 break; 4526 } 4527 else 4528 /* TO+ event, not very much we could do */ 4529 switch (sp->state[IDX_PAP]) { 4530 case STATE_REQ_SENT: 4531 /* sppp_cp_change_state() will restart the timer */ 4532 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4533 break; 4534 } 4535 4536 splx(s); 4537 } 4538 4539 /* 4540 * That's the timeout handler if we are peer. Since the peer is active, 4541 * we need to retransmit our PAP request since it is apparently lost. 4542 * XXX We should impose a max counter. 4543 */ 4544 static void 4545 sppp_pap_my_TO(void *cookie) 4546 { 4547 struct sppp *sp = (struct sppp *)cookie; 4548 STDDCL; 4549 4550 if (debug) 4551 log(LOG_DEBUG, "%s: pap peer TO\n", 4552 ifp->if_xname); 4553 4554 pap.scr(sp); 4555 } 4556 4557 static void 4558 sppp_pap_tlu(struct sppp *sp) 4559 { 4560 STDDCL; 4561 int x; 4562 4563 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4564 4565 if (debug) 4566 log(LOG_DEBUG, "%s: %s tlu\n", 4567 ifp->if_xname, pap.name); 4568 4569 x = splnet(); 4570 sp->pp_auth_failures = 0; 4571 /* indicate to LCP that we need to be closed down */ 4572 sp->lcp.protos |= (1 << IDX_PAP); 4573 4574 if (sp->pp_flags & PP_NEEDAUTH) { 4575 /* 4576 * Remote is authenticator, but his auth proto didn't 4577 * complete yet. Defer the transition to network 4578 * phase. 4579 */ 4580 splx(x); 4581 return; 4582 } 4583 splx(x); 4584 sppp_phase_network(sp); 4585 } 4586 4587 static void 4588 sppp_pap_tld(struct sppp *sp) 4589 { 4590 STDDCL; 4591 4592 if (debug) 4593 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4594 callout_stop(&sp->ch[IDX_PAP]); 4595 callout_stop(&sp->pap_my_to_ch); 4596 sp->lcp.protos &= ~(1 << IDX_PAP); 4597 4598 lcp.Close(sp); 4599 } 4600 4601 static void 4602 sppp_pap_scr(struct sppp *sp) 4603 { 4604 u_char idlen, pwdlen; 4605 4606 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4607 /* can't do anything useful */ 4608 printf("%s: pap starting without my name and secret being set\n", 4609 sp->pp_if.if_xname); 4610 return; 4611 } 4612 4613 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4614 pwdlen = sp->myauth.secret_len; 4615 idlen = sp->myauth.name_len; 4616 4617 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4618 sizeof idlen, (const char *)&idlen, 4619 idlen, sp->myauth.name, 4620 sizeof pwdlen, (const char *)&pwdlen, 4621 pwdlen, sp->myauth.secret, 4622 0); 4623 } 4624 4625 /* 4626 * Random miscellaneous functions. 4627 */ 4628 4629 /* 4630 * Send a PAP or CHAP proto packet. 4631 * 4632 * Varadic function, each of the elements for the ellipsis is of type 4633 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4634 * mlen == 0. 4635 * NOTE: never declare variadic functions with types subject to type 4636 * promotion (i.e. u_char). This is asking for big trouble depending 4637 * on the architecture you are on... 4638 */ 4639 4640 static void 4641 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4642 unsigned int type, unsigned int id, 4643 ...) 4644 { 4645 STDDCL; 4646 struct lcp_header *lh; 4647 struct mbuf *m; 4648 u_char *p; 4649 int len; 4650 size_t pkthdrlen; 4651 unsigned int mlen; 4652 const char *msg; 4653 va_list ap; 4654 4655 MGETHDR(m, M_DONTWAIT, MT_DATA); 4656 if (! m) 4657 return; 4658 m->m_pkthdr.rcvif = 0; 4659 4660 if (sp->pp_flags & PP_NOFRAMING) { 4661 *mtod(m, uint16_t *) = htons(cp->proto); 4662 pkthdrlen = 2; 4663 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4664 } else { 4665 struct ppp_header *h; 4666 h = mtod(m, struct ppp_header *); 4667 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4668 h->control = PPP_UI; /* Unnumbered Info */ 4669 h->protocol = htons(cp->proto); 4670 pkthdrlen = PPP_HEADER_LEN; 4671 4672 lh = (struct lcp_header *)(h + 1); 4673 } 4674 4675 lh->type = type; 4676 lh->ident = id; 4677 p = (u_char *)(lh + 1); 4678 4679 va_start(ap, id); 4680 len = 0; 4681 4682 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4683 msg = va_arg(ap, const char *); 4684 len += mlen; 4685 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4686 va_end(ap); 4687 m_freem(m); 4688 return; 4689 } 4690 4691 memcpy(p, msg, mlen); 4692 p += mlen; 4693 } 4694 va_end(ap); 4695 4696 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4697 lh->len = htons(LCP_HEADER_LEN + len); 4698 4699 if (debug) { 4700 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4701 ifp->if_xname, cp->name, 4702 sppp_auth_type_name(cp->proto, lh->type), 4703 lh->ident, ntohs(lh->len)); 4704 if (len) 4705 sppp_print_bytes((u_char *)(lh + 1), len); 4706 addlog(">\n"); 4707 } 4708 if (IF_QFULL(&sp->pp_cpq)) { 4709 IF_DROP(&sp->pp_fastq); 4710 IF_DROP(&ifp->if_snd); 4711 m_freem(m); 4712 ++ifp->if_oerrors; 4713 return; 4714 } else 4715 IF_ENQUEUE(&sp->pp_cpq, m); 4716 if (! (ifp->if_flags & IFF_OACTIVE)) 4717 (*ifp->if_start)(ifp); 4718 ifp->if_obytes += m->m_pkthdr.len + 3; 4719 } 4720 4721 /* 4722 * Send keepalive packets, every 10 seconds. 4723 */ 4724 static void 4725 sppp_keepalive(void *dummy) 4726 { 4727 struct sppp *sp; 4728 int s; 4729 time_t now; 4730 4731 s = splnet(); 4732 now = time_uptime; 4733 for (sp=spppq; sp; sp=sp->pp_next) { 4734 struct ifnet *ifp = &sp->pp_if; 4735 4736 /* check idle timeout */ 4737 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4738 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4739 /* idle timeout is enabled for this interface */ 4740 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4741 if (ifp->if_flags & IFF_DEBUG) 4742 printf("%s: no activity for %lu seconds\n", 4743 sp->pp_if.if_xname, 4744 (unsigned long)(now-sp->pp_last_activity)); 4745 lcp.Close(sp); 4746 continue; 4747 } 4748 } 4749 4750 /* Keepalive mode disabled or channel down? */ 4751 if (! (sp->pp_flags & PP_KEEPALIVE) || 4752 ! (ifp->if_flags & IFF_RUNNING)) 4753 continue; 4754 4755 /* No keepalive in PPP mode if LCP not opened yet. */ 4756 if (! (sp->pp_flags & PP_CISCO) && 4757 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4758 continue; 4759 4760 /* No echo reply, but maybe user data passed through? */ 4761 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4762 sp->pp_alivecnt = 0; 4763 continue; 4764 } 4765 4766 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4767 /* No keepalive packets got. Stop the interface. */ 4768 if_down (ifp); 4769 IF_PURGE(&sp->pp_cpq); 4770 if (! (sp->pp_flags & PP_CISCO)) { 4771 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4772 ifp->if_xname); 4773 sp->pp_alivecnt = 0; 4774 4775 /* we are down, close all open protocols */ 4776 lcp.Close(sp); 4777 4778 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4779 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4780 4781 /* Close connection immediately, completition of this 4782 * will summon the magic needed to reestablish it. */ 4783 if (sp->pp_tlf) 4784 sp->pp_tlf(sp); 4785 continue; 4786 } 4787 } 4788 if (sp->pp_alivecnt < sp->pp_maxalive) 4789 ++sp->pp_alivecnt; 4790 if (sp->pp_flags & PP_CISCO) 4791 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4792 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4793 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4794 int32_t nmagic = htonl(sp->lcp.magic); 4795 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4796 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4797 sp->lcp.echoid, 4, &nmagic); 4798 } 4799 } 4800 splx(s); 4801 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4802 } 4803 4804 #ifdef INET 4805 /* 4806 * Get both IP addresses. 4807 */ 4808 static void 4809 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4810 { 4811 struct ifnet *ifp = &sp->pp_if; 4812 struct ifaddr *ifa; 4813 struct sockaddr_in *si, *sm; 4814 uint32_t ssrc, ddst; 4815 4816 sm = NULL; 4817 ssrc = ddst = 0; 4818 /* 4819 * Pick the first AF_INET address from the list, 4820 * aliases don't make any sense on a p2p link anyway. 4821 */ 4822 si = 0; 4823 IFADDR_FOREACH(ifa, ifp) { 4824 if (ifa->ifa_addr->sa_family == AF_INET) { 4825 si = (struct sockaddr_in *)ifa->ifa_addr; 4826 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4827 if (si) 4828 break; 4829 } 4830 } 4831 if (ifa) { 4832 if (si && si->sin_addr.s_addr) { 4833 ssrc = si->sin_addr.s_addr; 4834 if (srcmask) 4835 *srcmask = ntohl(sm->sin_addr.s_addr); 4836 } 4837 4838 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4839 if (si && si->sin_addr.s_addr) 4840 ddst = si->sin_addr.s_addr; 4841 } 4842 4843 if (dst) *dst = ntohl(ddst); 4844 if (src) *src = ntohl(ssrc); 4845 } 4846 4847 /* 4848 * Set IP addresses. Must be called at splnet. 4849 * If an address is 0, leave it the way it is. 4850 */ 4851 static void 4852 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4853 { 4854 STDDCL; 4855 struct ifaddr *ifa; 4856 struct sockaddr_in *si, *dest; 4857 4858 /* 4859 * Pick the first AF_INET address from the list, 4860 * aliases don't make any sense on a p2p link anyway. 4861 */ 4862 4863 IFADDR_FOREACH(ifa, ifp) { 4864 if (ifa->ifa_addr->sa_family == AF_INET) { 4865 si = (struct sockaddr_in *)ifa->ifa_addr; 4866 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4867 goto found; 4868 } 4869 } 4870 return; 4871 4872 found: 4873 { 4874 int error; 4875 struct sockaddr_in new_sin = *si; 4876 struct sockaddr_in new_dst = *dest; 4877 4878 /* 4879 * Scrub old routes now instead of calling in_ifinit with 4880 * scrub=1, because we may change the dstaddr 4881 * before the call to in_ifinit. 4882 */ 4883 in_ifscrub(ifp, ifatoia(ifa)); 4884 4885 if (myaddr != 0) 4886 new_sin.sin_addr.s_addr = htonl(myaddr); 4887 if (hisaddr != 0) { 4888 new_dst.sin_addr.s_addr = htonl(hisaddr); 4889 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4890 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4891 *dest = new_dst; /* fix dstaddr in place */ 4892 } 4893 } 4894 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4895 if (debug && error) 4896 { 4897 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4898 " failed, error=%d\n", ifp->if_xname, error); 4899 } 4900 #ifdef PFIL_HOOKS 4901 if (!error) 4902 (void)pfil_run_hooks(&if_pfil, 4903 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4904 #endif 4905 } 4906 } 4907 4908 /* 4909 * Clear IP addresses. Must be called at splnet. 4910 */ 4911 static void 4912 sppp_clear_ip_addrs(struct sppp *sp) 4913 { 4914 struct ifnet *ifp = &sp->pp_if; 4915 struct ifaddr *ifa; 4916 struct sockaddr_in *si, *dest; 4917 4918 uint32_t remote; 4919 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4920 remote = sp->ipcp.saved_hisaddr; 4921 else 4922 sppp_get_ip_addrs(sp, 0, &remote, 0); 4923 4924 /* 4925 * Pick the first AF_INET address from the list, 4926 * aliases don't make any sense on a p2p link anyway. 4927 */ 4928 4929 IFADDR_FOREACH(ifa, ifp) { 4930 if (ifa->ifa_addr->sa_family == AF_INET) { 4931 si = (struct sockaddr_in *)ifa->ifa_addr; 4932 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4933 goto found; 4934 } 4935 } 4936 return; 4937 4938 found: 4939 { 4940 struct sockaddr_in new_sin = *si; 4941 4942 in_ifscrub(ifp, ifatoia(ifa)); 4943 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4944 new_sin.sin_addr.s_addr = 0; 4945 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4946 /* replace peer addr in place */ 4947 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4948 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4949 #ifdef PFIL_HOOKS 4950 (void)pfil_run_hooks(&if_pfil, 4951 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4952 #endif 4953 } 4954 } 4955 #endif 4956 4957 #ifdef INET6 4958 /* 4959 * Get both IPv6 addresses. 4960 */ 4961 static void 4962 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4963 struct in6_addr *srcmask) 4964 { 4965 struct ifnet *ifp = &sp->pp_if; 4966 struct ifaddr *ifa; 4967 struct sockaddr_in6 *si, *sm; 4968 struct in6_addr ssrc, ddst; 4969 4970 sm = NULL; 4971 memset(&ssrc, 0, sizeof(ssrc)); 4972 memset(&ddst, 0, sizeof(ddst)); 4973 /* 4974 * Pick the first link-local AF_INET6 address from the list, 4975 * aliases don't make any sense on a p2p link anyway. 4976 */ 4977 si = 0; 4978 IFADDR_FOREACH(ifa, ifp) 4979 if (ifa->ifa_addr->sa_family == AF_INET6) { 4980 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4981 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4982 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4983 break; 4984 } 4985 if (ifa) { 4986 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4987 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4988 if (srcmask) { 4989 memcpy(srcmask, &sm->sin6_addr, 4990 sizeof(*srcmask)); 4991 } 4992 } 4993 4994 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4995 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4996 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4997 } 4998 4999 if (dst) 5000 memcpy(dst, &ddst, sizeof(*dst)); 5001 if (src) 5002 memcpy(src, &ssrc, sizeof(*src)); 5003 } 5004 5005 #ifdef IPV6CP_MYIFID_DYN 5006 /* 5007 * Generate random ifid. 5008 */ 5009 static void 5010 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5011 { 5012 /* TBD */ 5013 } 5014 5015 /* 5016 * Set my IPv6 address. Must be called at splnet. 5017 */ 5018 static void 5019 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5020 { 5021 STDDCL; 5022 struct ifaddr *ifa; 5023 struct sockaddr_in6 *sin6; 5024 5025 /* 5026 * Pick the first link-local AF_INET6 address from the list, 5027 * aliases don't make any sense on a p2p link anyway. 5028 */ 5029 5030 sin6 = NULL; 5031 IFADDR_FOREACH(ifa, ifp) 5032 { 5033 if (ifa->ifa_addr->sa_family == AF_INET6) 5034 { 5035 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5036 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5037 break; 5038 } 5039 } 5040 5041 if (ifa && sin6) 5042 { 5043 int error; 5044 struct sockaddr_in6 new_sin6 = *sin6; 5045 5046 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5047 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5048 if (debug && error) 5049 { 5050 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5051 " failed, error=%d\n", ifp->if_xname, error); 5052 } 5053 #ifdef PFIL_HOOKS 5054 if (!error) 5055 (void)pfil_run_hooks(&if_pfil, 5056 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5057 #endif 5058 } 5059 } 5060 #endif 5061 5062 /* 5063 * Suggest a candidate address to be used by peer. 5064 */ 5065 static void 5066 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5067 { 5068 struct in6_addr myaddr; 5069 struct timeval tv; 5070 5071 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5072 5073 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5074 microtime(&tv); 5075 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5076 myaddr.s6_addr[14] ^= 0xff; 5077 myaddr.s6_addr[15] ^= 0xff; 5078 } else { 5079 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5080 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5081 } 5082 if (suggest) 5083 memcpy(suggest, &myaddr, sizeof(myaddr)); 5084 } 5085 #endif /*INET6*/ 5086 5087 /* 5088 * Process ioctl requests specific to the PPP interface. 5089 * Permissions have already been checked. 5090 */ 5091 static int 5092 sppp_params(struct sppp *sp, u_long cmd, void *data) 5093 { 5094 switch (cmd) { 5095 case SPPPGETAUTHCFG: 5096 { 5097 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5098 int error; 5099 size_t len; 5100 5101 cfg->myauthflags = sp->myauth.flags; 5102 cfg->hisauthflags = sp->hisauth.flags; 5103 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5104 cfg->hisauth = 0; 5105 if (sp->hisauth.proto) 5106 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5107 cfg->myauth = 0; 5108 if (sp->myauth.proto) 5109 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5110 if (cfg->myname_length == 0) { 5111 if (sp->myauth.name != NULL) 5112 cfg->myname_length = sp->myauth.name_len + 1; 5113 } else { 5114 if (sp->myauth.name == NULL) { 5115 cfg->myname_length = 0; 5116 } else { 5117 len = sp->myauth.name_len + 1; 5118 if (cfg->myname_length < len) 5119 return (ENAMETOOLONG); 5120 error = copyout(sp->myauth.name, cfg->myname, len); 5121 if (error) return error; 5122 } 5123 } 5124 if (cfg->hisname_length == 0) { 5125 if (sp->hisauth.name != NULL) 5126 cfg->hisname_length = sp->hisauth.name_len + 1; 5127 } else { 5128 if (sp->hisauth.name == NULL) { 5129 cfg->hisname_length = 0; 5130 } else { 5131 len = sp->hisauth.name_len + 1; 5132 if (cfg->hisname_length < len) 5133 return (ENAMETOOLONG); 5134 error = copyout(sp->hisauth.name, cfg->hisname, len); 5135 if (error) return error; 5136 } 5137 } 5138 } 5139 break; 5140 case SPPPSETAUTHCFG: 5141 { 5142 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5143 int error; 5144 5145 if (sp->myauth.name) { 5146 free(sp->myauth.name, M_DEVBUF); 5147 sp->myauth.name = NULL; 5148 } 5149 if (sp->myauth.secret) { 5150 free(sp->myauth.secret, M_DEVBUF); 5151 sp->myauth.secret = NULL; 5152 } 5153 if (sp->hisauth.name) { 5154 free(sp->hisauth.name, M_DEVBUF); 5155 sp->hisauth.name = NULL; 5156 } 5157 if (sp->hisauth.secret) { 5158 free(sp->hisauth.secret, M_DEVBUF); 5159 sp->hisauth.secret = NULL; 5160 } 5161 5162 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5163 if (cfg->hisname_length >= MCLBYTES) 5164 return (ENAMETOOLONG); 5165 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5166 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5167 if (error) { 5168 free(sp->hisauth.name, M_DEVBUF); 5169 sp->hisauth.name = NULL; 5170 return error; 5171 } 5172 sp->hisauth.name_len = cfg->hisname_length - 1; 5173 sp->hisauth.name[sp->hisauth.name_len] = 0; 5174 } 5175 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5176 if (cfg->hissecret_length >= MCLBYTES) 5177 return (ENAMETOOLONG); 5178 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5179 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5180 if (error) { 5181 free(sp->hisauth.secret, M_DEVBUF); 5182 sp->hisauth.secret = NULL; 5183 return error; 5184 } 5185 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5186 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5187 } 5188 if (cfg->myname != NULL && cfg->myname_length > 0) { 5189 if (cfg->myname_length >= MCLBYTES) 5190 return (ENAMETOOLONG); 5191 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5192 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5193 if (error) { 5194 free(sp->myauth.name, M_DEVBUF); 5195 sp->myauth.name = NULL; 5196 return error; 5197 } 5198 sp->myauth.name_len = cfg->myname_length - 1; 5199 sp->myauth.name[sp->myauth.name_len] = 0; 5200 } 5201 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5202 if (cfg->mysecret_length >= MCLBYTES) 5203 return (ENAMETOOLONG); 5204 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5205 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5206 if (error) { 5207 free(sp->myauth.secret, M_DEVBUF); 5208 sp->myauth.secret = NULL; 5209 return error; 5210 } 5211 sp->myauth.secret_len = cfg->mysecret_length - 1; 5212 sp->myauth.secret[sp->myauth.secret_len] = 0; 5213 } 5214 sp->myauth.flags = cfg->myauthflags; 5215 if (cfg->myauth) 5216 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5217 sp->hisauth.flags = cfg->hisauthflags; 5218 if (cfg->hisauth) 5219 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5220 sp->pp_auth_failures = 0; 5221 if (sp->hisauth.proto != 0) 5222 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5223 else 5224 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5225 } 5226 break; 5227 case SPPPGETLCPCFG: 5228 { 5229 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5230 lcpp->lcp_timeout = sp->lcp.timeout; 5231 } 5232 break; 5233 case SPPPSETLCPCFG: 5234 { 5235 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5236 sp->lcp.timeout = lcpp->lcp_timeout; 5237 } 5238 break; 5239 case SPPPGETSTATUS: 5240 { 5241 struct spppstatus *status = (struct spppstatus *)data; 5242 status->phase = sp->pp_phase; 5243 } 5244 break; 5245 case SPPPGETSTATUSNCP: 5246 { 5247 struct spppstatusncp *status = (struct spppstatusncp *)data; 5248 status->phase = sp->pp_phase; 5249 status->ncpup = sppp_ncp_check(sp); 5250 } 5251 break; 5252 case SPPPGETIDLETO: 5253 { 5254 struct spppidletimeout *to = (struct spppidletimeout *)data; 5255 to->idle_seconds = sp->pp_idle_timeout; 5256 } 5257 break; 5258 case SPPPSETIDLETO: 5259 { 5260 struct spppidletimeout *to = (struct spppidletimeout *)data; 5261 sp->pp_idle_timeout = to->idle_seconds; 5262 } 5263 break; 5264 case SPPPSETAUTHFAILURE: 5265 { 5266 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5267 sp->pp_max_auth_fail = afsettings->max_failures; 5268 sp->pp_auth_failures = 0; 5269 } 5270 break; 5271 case SPPPGETAUTHFAILURES: 5272 { 5273 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5274 stats->auth_failures = sp->pp_auth_failures; 5275 stats->max_failures = sp->pp_max_auth_fail; 5276 } 5277 break; 5278 case SPPPSETDNSOPTS: 5279 { 5280 struct spppdnssettings *req = (struct spppdnssettings *)data; 5281 sp->query_dns = req->query_dns & 3; 5282 } 5283 break; 5284 case SPPPGETDNSOPTS: 5285 { 5286 struct spppdnssettings *req = (struct spppdnssettings *)data; 5287 req->query_dns = sp->query_dns; 5288 } 5289 break; 5290 case SPPPGETDNSADDRS: 5291 { 5292 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5293 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5294 } 5295 break; 5296 case SPPPGETKEEPALIVE: 5297 { 5298 struct spppkeepalivesettings *settings = 5299 (struct spppkeepalivesettings*)data; 5300 settings->maxalive = sp->pp_maxalive; 5301 settings->max_noreceive = sp->pp_max_noreceive; 5302 } 5303 break; 5304 case SPPPSETKEEPALIVE: 5305 { 5306 struct spppkeepalivesettings *settings = 5307 (struct spppkeepalivesettings*)data; 5308 sp->pp_maxalive = settings->maxalive; 5309 sp->pp_max_noreceive = settings->max_noreceive; 5310 } 5311 break; 5312 #if defined(COMPAT_50) || defined(MODULAR) 5313 case __SPPPGETIDLETO50: 5314 { 5315 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5316 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5317 } 5318 break; 5319 case __SPPPSETIDLETO50: 5320 { 5321 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5322 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5323 } 5324 break; 5325 case __SPPPGETKEEPALIVE50: 5326 { 5327 struct spppkeepalivesettings50 *settings = 5328 (struct spppkeepalivesettings50*)data; 5329 settings->maxalive = sp->pp_maxalive; 5330 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5331 } 5332 break; 5333 case __SPPPSETKEEPALIVE50: 5334 { 5335 struct spppkeepalivesettings50 *settings = 5336 (struct spppkeepalivesettings50*)data; 5337 sp->pp_maxalive = settings->maxalive; 5338 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5339 } 5340 break; 5341 #endif /* COMPAT_50 || MODULAR */ 5342 default: 5343 return (EINVAL); 5344 } 5345 5346 return (0); 5347 } 5348 5349 static void 5350 sppp_phase_network(struct sppp *sp) 5351 { 5352 STDDCL; 5353 int i; 5354 uint32_t mask; 5355 5356 sp->pp_phase = SPPP_PHASE_NETWORK; 5357 5358 if (debug) 5359 { 5360 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5361 sppp_phase_name(sp->pp_phase)); 5362 } 5363 5364 /* Notify NCPs now. */ 5365 for (i = 0; i < IDX_COUNT; i++) 5366 if ((cps[i])->flags & CP_NCP) 5367 (cps[i])->Open(sp); 5368 5369 /* Send Up events to all NCPs. */ 5370 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5371 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5372 (cps[i])->Up(sp); 5373 5374 /* if no NCP is starting, all this was in vain, close down */ 5375 sppp_lcp_check_and_close(sp); 5376 } 5377 5378 5379 static const char * 5380 sppp_cp_type_name(u_char type) 5381 { 5382 static char buf[12]; 5383 switch (type) { 5384 case CONF_REQ: return "conf-req"; 5385 case CONF_ACK: return "conf-ack"; 5386 case CONF_NAK: return "conf-nak"; 5387 case CONF_REJ: return "conf-rej"; 5388 case TERM_REQ: return "term-req"; 5389 case TERM_ACK: return "term-ack"; 5390 case CODE_REJ: return "code-rej"; 5391 case PROTO_REJ: return "proto-rej"; 5392 case ECHO_REQ: return "echo-req"; 5393 case ECHO_REPLY: return "echo-reply"; 5394 case DISC_REQ: return "discard-req"; 5395 } 5396 snprintf(buf, sizeof(buf), "0x%x", type); 5397 return buf; 5398 } 5399 5400 static const char * 5401 sppp_auth_type_name(u_short proto, u_char type) 5402 { 5403 static char buf[12]; 5404 switch (proto) { 5405 case PPP_CHAP: 5406 switch (type) { 5407 case CHAP_CHALLENGE: return "challenge"; 5408 case CHAP_RESPONSE: return "response"; 5409 case CHAP_SUCCESS: return "success"; 5410 case CHAP_FAILURE: return "failure"; 5411 } 5412 case PPP_PAP: 5413 switch (type) { 5414 case PAP_REQ: return "req"; 5415 case PAP_ACK: return "ack"; 5416 case PAP_NAK: return "nak"; 5417 } 5418 } 5419 snprintf(buf, sizeof(buf), "0x%x", type); 5420 return buf; 5421 } 5422 5423 static const char * 5424 sppp_lcp_opt_name(u_char opt) 5425 { 5426 static char buf[12]; 5427 switch (opt) { 5428 case LCP_OPT_MRU: return "mru"; 5429 case LCP_OPT_ASYNC_MAP: return "async-map"; 5430 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5431 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5432 case LCP_OPT_MAGIC: return "magic"; 5433 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5434 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5435 } 5436 snprintf(buf, sizeof(buf), "0x%x", opt); 5437 return buf; 5438 } 5439 5440 static const char * 5441 sppp_ipcp_opt_name(u_char opt) 5442 { 5443 static char buf[12]; 5444 switch (opt) { 5445 case IPCP_OPT_ADDRESSES: return "addresses"; 5446 case IPCP_OPT_COMPRESSION: return "compression"; 5447 case IPCP_OPT_ADDRESS: return "address"; 5448 } 5449 snprintf(buf, sizeof(buf), "0x%x", opt); 5450 return buf; 5451 } 5452 5453 #ifdef INET6 5454 static const char * 5455 sppp_ipv6cp_opt_name(u_char opt) 5456 { 5457 static char buf[12]; 5458 switch (opt) { 5459 case IPV6CP_OPT_IFID: return "ifid"; 5460 case IPV6CP_OPT_COMPRESSION: return "compression"; 5461 } 5462 snprintf(buf, sizeof(buf), "0x%x", opt); 5463 return buf; 5464 } 5465 #endif 5466 5467 static const char * 5468 sppp_state_name(int state) 5469 { 5470 switch (state) { 5471 case STATE_INITIAL: return "initial"; 5472 case STATE_STARTING: return "starting"; 5473 case STATE_CLOSED: return "closed"; 5474 case STATE_STOPPED: return "stopped"; 5475 case STATE_CLOSING: return "closing"; 5476 case STATE_STOPPING: return "stopping"; 5477 case STATE_REQ_SENT: return "req-sent"; 5478 case STATE_ACK_RCVD: return "ack-rcvd"; 5479 case STATE_ACK_SENT: return "ack-sent"; 5480 case STATE_OPENED: return "opened"; 5481 } 5482 return "illegal"; 5483 } 5484 5485 static const char * 5486 sppp_phase_name(int phase) 5487 { 5488 switch (phase) { 5489 case SPPP_PHASE_DEAD: return "dead"; 5490 case SPPP_PHASE_ESTABLISH: return "establish"; 5491 case SPPP_PHASE_TERMINATE: return "terminate"; 5492 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5493 case SPPP_PHASE_NETWORK: return "network"; 5494 } 5495 return "illegal"; 5496 } 5497 5498 static const char * 5499 sppp_proto_name(u_short proto) 5500 { 5501 static char buf[12]; 5502 switch (proto) { 5503 case PPP_LCP: return "lcp"; 5504 case PPP_IPCP: return "ipcp"; 5505 case PPP_PAP: return "pap"; 5506 case PPP_CHAP: return "chap"; 5507 case PPP_IPV6CP: return "ipv6cp"; 5508 } 5509 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5510 return buf; 5511 } 5512 5513 static void 5514 sppp_print_bytes(const u_char *p, u_short len) 5515 { 5516 addlog(" %02x", *p++); 5517 while (--len > 0) 5518 addlog("-%02x", *p++); 5519 } 5520 5521 static void 5522 sppp_print_string(const char *p, u_short len) 5523 { 5524 u_char c; 5525 5526 while (len-- > 0) { 5527 c = *p++; 5528 /* 5529 * Print only ASCII chars directly. RFC 1994 recommends 5530 * using only them, but we don't rely on it. */ 5531 if (c < ' ' || c > '~') 5532 addlog("\\x%x", c); 5533 else 5534 addlog("%c", c); 5535 } 5536 } 5537 5538 static const char * 5539 sppp_dotted_quad(uint32_t addr) 5540 { 5541 static char s[16]; 5542 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5543 (int)((addr >> 24) & 0xff), 5544 (int)((addr >> 16) & 0xff), 5545 (int)((addr >> 8) & 0xff), 5546 (int)(addr & 0xff)); 5547 return s; 5548 } 5549 5550 /* a dummy, used to drop uninteresting events */ 5551 static void 5552 sppp_null(struct sppp *unused) 5553 { 5554 /* do just nothing */ 5555 } 5556 /* 5557 * This file is large. Tell emacs to highlight it nevertheless. 5558 * 5559 * Local Variables: 5560 * hilit-auto-highlight-maxout: 120000 5561 * End: 5562 */ 5563
Indexes created Mon Oct 13 14:09:54 GMT 2025