if_spppsubr.c revision 1.123.2.2
1 /* $NetBSD: if_spppsubr.c,v 1.123.2.2 2014/05/22 11:41:09 yamt 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 1.123.2.2 2014/05/22 11:41:09 yamt Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_modular.h" 50 #include "opt_compat_netbsd.h" 51 #endif 52 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 69 #include <net/if.h> 70 #include <net/netisr.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/ppp_defs.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip.h> 80 #include <netinet/tcp.h> 81 #endif 82 #include <net/ethertypes.h> 83 84 #ifdef INET6 85 #include <netinet6/scope6_var.h> 86 #endif 87 88 #ifdef IPX 89 #include <netipx/ipx.h> 90 #include <netipx/ipx_if.h> 91 #endif 92 93 #include <net/if_sppp.h> 94 #include <net/if_spppvar.h> 95 96 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 97 #define LOOPALIVECNT 3 /* loopback detection tries */ 98 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 99 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 100 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 101 102 /* 103 * Interface flags that can be set in an ifconfig command. 104 * 105 * Setting link0 will make the link passive, i.e. it will be marked 106 * as being administrative openable, but won't be opened to begin 107 * with. Incoming calls will be answered, or subsequent calls with 108 * -link1 will cause the administrative open of the LCP layer. 109 * 110 * Setting link1 will cause the link to auto-dial only as packets 111 * arrive to be sent. 112 * 113 * Setting IFF_DEBUG will syslog the option negotiation and state 114 * transitions at level kern.debug. Note: all logs consistently look 115 * like 116 * 117 * <if-name><unit>: <proto-name> <additional info...> 118 * 119 * with <if-name><unit> being something like "bppp0", and <proto-name> 120 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 121 */ 122 123 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 124 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 125 126 #define CONF_REQ 1 /* PPP configure request */ 127 #define CONF_ACK 2 /* PPP configure acknowledge */ 128 #define CONF_NAK 3 /* PPP configure negative ack */ 129 #define CONF_REJ 4 /* PPP configure reject */ 130 #define TERM_REQ 5 /* PPP terminate request */ 131 #define TERM_ACK 6 /* PPP terminate acknowledge */ 132 #define CODE_REJ 7 /* PPP code reject */ 133 #define PROTO_REJ 8 /* PPP protocol reject */ 134 #define ECHO_REQ 9 /* PPP echo request */ 135 #define ECHO_REPLY 10 /* PPP echo reply */ 136 #define DISC_REQ 11 /* PPP discard request */ 137 138 #define LCP_OPT_MRU 1 /* maximum receive unit */ 139 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 140 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 141 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 142 #define LCP_OPT_MAGIC 5 /* magic number */ 143 #define LCP_OPT_RESERVED 6 /* reserved */ 144 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 145 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 146 147 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 148 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 149 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 150 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 151 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 152 153 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 154 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 155 156 #define PAP_REQ 1 /* PAP name/password request */ 157 #define PAP_ACK 2 /* PAP acknowledge */ 158 #define PAP_NAK 3 /* PAP fail */ 159 160 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 161 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 162 #define CHAP_SUCCESS 3 /* CHAP response ok */ 163 #define CHAP_FAILURE 4 /* CHAP response failed */ 164 165 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 166 167 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 168 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 169 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 170 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 171 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 172 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 173 174 /* states are named and numbered according to RFC 1661 */ 175 #define STATE_INITIAL 0 176 #define STATE_STARTING 1 177 #define STATE_CLOSED 2 178 #define STATE_STOPPED 3 179 #define STATE_CLOSING 4 180 #define STATE_STOPPING 5 181 #define STATE_REQ_SENT 6 182 #define STATE_ACK_RCVD 7 183 #define STATE_ACK_SENT 8 184 #define STATE_OPENED 9 185 186 struct ppp_header { 187 uint8_t address; 188 uint8_t control; 189 uint16_t protocol; 190 } __packed; 191 #define PPP_HEADER_LEN sizeof (struct ppp_header) 192 193 struct lcp_header { 194 uint8_t type; 195 uint8_t ident; 196 uint16_t len; 197 } __packed; 198 #define LCP_HEADER_LEN sizeof (struct lcp_header) 199 200 struct cisco_packet { 201 uint32_t type; 202 uint32_t par1; 203 uint32_t par2; 204 uint16_t rel; 205 uint16_t time0; 206 uint16_t time1; 207 } __packed; 208 #define CISCO_PACKET_LEN 18 209 210 /* 211 * We follow the spelling and capitalization of RFC 1661 here, to make 212 * it easier comparing with the standard. Please refer to this RFC in 213 * case you can't make sense out of these abbreviation; it will also 214 * explain the semantics related to the various events and actions. 215 */ 216 struct cp { 217 u_short proto; /* PPP control protocol number */ 218 u_char protoidx; /* index into state table in struct sppp */ 219 u_char flags; 220 #define CP_LCP 0x01 /* this is the LCP */ 221 #define CP_AUTH 0x02 /* this is an authentication protocol */ 222 #define CP_NCP 0x04 /* this is a NCP */ 223 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 224 const char *name; /* name of this control protocol */ 225 /* event handlers */ 226 void (*Up)(struct sppp *sp); 227 void (*Down)(struct sppp *sp); 228 void (*Open)(struct sppp *sp); 229 void (*Close)(struct sppp *sp); 230 void (*TO)(void *sp); 231 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 232 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 233 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 234 /* actions */ 235 void (*tlu)(struct sppp *sp); 236 void (*tld)(struct sppp *sp); 237 void (*tls)(struct sppp *sp); 238 void (*tlf)(struct sppp *sp); 239 void (*scr)(struct sppp *sp); 240 }; 241 242 static struct sppp *spppq; 243 static callout_t keepalive_ch; 244 245 #ifdef INET 246 /* 247 * The following disgusting hack gets around the problem that IP TOS 248 * can't be set yet. We want to put "interactive" traffic on a high 249 * priority queue. To decide if traffic is interactive, we check that 250 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 251 * 252 * XXX is this really still necessary? - joerg - 253 */ 254 static u_short interactive_ports[8] = { 255 0, 513, 0, 0, 256 0, 21, 0, 23, 257 }; 258 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 259 #endif 260 261 /* almost every function needs these */ 262 #define STDDCL \ 263 struct ifnet *ifp = &sp->pp_if; \ 264 int debug = ifp->if_flags & IFF_DEBUG 265 266 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 267 const struct sockaddr *dst, struct rtentry *rt); 268 269 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 270 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 271 272 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 273 struct mbuf *m); 274 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 275 u_char ident, u_short len, void *data); 276 /* static void sppp_cp_timeout(void *arg); */ 277 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 278 int newstate); 279 static void sppp_auth_send(const struct cp *cp, 280 struct sppp *sp, unsigned int type, unsigned int id, 281 ...); 282 283 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 284 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 285 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 286 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 288 289 static void sppp_null(struct sppp *sp); 290 291 static void sppp_lcp_init(struct sppp *sp); 292 static void sppp_lcp_up(struct sppp *sp); 293 static void sppp_lcp_down(struct sppp *sp); 294 static void sppp_lcp_open(struct sppp *sp); 295 static void sppp_lcp_close(struct sppp *sp); 296 static void sppp_lcp_TO(void *sp); 297 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 298 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 299 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 300 static void sppp_lcp_tlu(struct sppp *sp); 301 static void sppp_lcp_tld(struct sppp *sp); 302 static void sppp_lcp_tls(struct sppp *sp); 303 static void sppp_lcp_tlf(struct sppp *sp); 304 static void sppp_lcp_scr(struct sppp *sp); 305 static void sppp_lcp_check_and_close(struct sppp *sp); 306 static int sppp_ncp_check(struct sppp *sp); 307 308 static void sppp_ipcp_init(struct sppp *sp); 309 static void sppp_ipcp_up(struct sppp *sp); 310 static void sppp_ipcp_down(struct sppp *sp); 311 static void sppp_ipcp_open(struct sppp *sp); 312 static void sppp_ipcp_close(struct sppp *sp); 313 static void sppp_ipcp_TO(void *sp); 314 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 315 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 316 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 317 static void sppp_ipcp_tlu(struct sppp *sp); 318 static void sppp_ipcp_tld(struct sppp *sp); 319 static void sppp_ipcp_tls(struct sppp *sp); 320 static void sppp_ipcp_tlf(struct sppp *sp); 321 static void sppp_ipcp_scr(struct sppp *sp); 322 323 static void sppp_ipv6cp_init(struct sppp *sp); 324 static void sppp_ipv6cp_up(struct sppp *sp); 325 static void sppp_ipv6cp_down(struct sppp *sp); 326 static void sppp_ipv6cp_open(struct sppp *sp); 327 static void sppp_ipv6cp_close(struct sppp *sp); 328 static void sppp_ipv6cp_TO(void *sp); 329 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 330 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 332 static void sppp_ipv6cp_tlu(struct sppp *sp); 333 static void sppp_ipv6cp_tld(struct sppp *sp); 334 static void sppp_ipv6cp_tls(struct sppp *sp); 335 static void sppp_ipv6cp_tlf(struct sppp *sp); 336 static void sppp_ipv6cp_scr(struct sppp *sp); 337 338 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 339 static void sppp_pap_init(struct sppp *sp); 340 static void sppp_pap_open(struct sppp *sp); 341 static void sppp_pap_close(struct sppp *sp); 342 static void sppp_pap_TO(void *sp); 343 static void sppp_pap_my_TO(void *sp); 344 static void sppp_pap_tlu(struct sppp *sp); 345 static void sppp_pap_tld(struct sppp *sp); 346 static void sppp_pap_scr(struct sppp *sp); 347 348 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 349 static void sppp_chap_init(struct sppp *sp); 350 static void sppp_chap_open(struct sppp *sp); 351 static void sppp_chap_close(struct sppp *sp); 352 static void sppp_chap_TO(void *sp); 353 static void sppp_chap_tlu(struct sppp *sp); 354 static void sppp_chap_tld(struct sppp *sp); 355 static void sppp_chap_scr(struct sppp *sp); 356 357 static const char *sppp_auth_type_name(u_short proto, u_char type); 358 static const char *sppp_cp_type_name(u_char type); 359 static const char *sppp_dotted_quad(uint32_t addr); 360 static const char *sppp_ipcp_opt_name(u_char opt); 361 #ifdef INET6 362 static const char *sppp_ipv6cp_opt_name(u_char opt); 363 #endif 364 static const char *sppp_lcp_opt_name(u_char opt); 365 static const char *sppp_phase_name(int phase); 366 static const char *sppp_proto_name(u_short proto); 367 static const char *sppp_state_name(int state); 368 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 369 #ifdef INET 370 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 371 uint32_t *srcmask); 372 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 373 static void sppp_clear_ip_addrs(struct sppp *sp); 374 #endif 375 static void sppp_keepalive(void *dummy); 376 static void sppp_phase_network(struct sppp *sp); 377 static void sppp_print_bytes(const u_char *p, u_short len); 378 static void sppp_print_string(const char *p, u_short len); 379 #ifdef INET6 380 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 381 struct in6_addr *dst, struct in6_addr *srcmask); 382 #ifdef IPV6CP_MYIFID_DYN 383 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 384 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 #endif 386 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 387 #endif 388 389 /* our control protocol descriptors */ 390 static const struct cp lcp = { 391 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 392 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 393 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 394 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 395 sppp_lcp_scr 396 }; 397 398 static const struct cp ipcp = { 399 PPP_IPCP, IDX_IPCP, 400 #ifdef INET 401 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 402 #else 403 0, 404 #endif 405 "ipcp", 406 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 407 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 408 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 409 sppp_ipcp_scr 410 }; 411 412 static const struct cp ipv6cp = { 413 PPP_IPV6CP, IDX_IPV6CP, 414 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 415 CP_NCP, 416 #else 417 0, 418 #endif 419 "ipv6cp", 420 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 421 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 422 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 423 sppp_ipv6cp_scr 424 }; 425 426 static const struct cp pap = { 427 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 428 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 429 sppp_pap_TO, 0, 0, 0, 430 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 431 sppp_pap_scr 432 }; 433 434 static const struct cp chap = { 435 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 436 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 437 sppp_chap_TO, 0, 0, 0, 438 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 439 sppp_chap_scr 440 }; 441 442 static const struct cp *cps[IDX_COUNT] = { 443 &lcp, /* IDX_LCP */ 444 &ipcp, /* IDX_IPCP */ 445 &ipv6cp, /* IDX_IPV6CP */ 446 &pap, /* IDX_PAP */ 447 &chap, /* IDX_CHAP */ 448 }; 449 450 451 void spppattach(int); 452 void 453 /*ARGSUSED*/ 454 spppattach(int count) 455 { 456 } 457 458 /* 459 * Exported functions, comprising our interface to the lower layer. 460 */ 461 462 /* 463 * Process the received packet. 464 */ 465 void 466 sppp_input(struct ifnet *ifp, struct mbuf *m) 467 { 468 struct ppp_header *h = NULL; 469 struct ifqueue *inq = 0; 470 uint16_t protocol; 471 int s; 472 struct sppp *sp = (struct sppp *)ifp; 473 int debug = ifp->if_flags & IFF_DEBUG; 474 475 if (ifp->if_flags & IFF_UP) { 476 /* Count received bytes, add hardware framing */ 477 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 478 /* Note time of last receive */ 479 sp->pp_last_receive = time_uptime; 480 } 481 482 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 483 /* Too small packet, drop it. */ 484 if (debug) 485 log(LOG_DEBUG, 486 "%s: input packet is too small, %d bytes\n", 487 ifp->if_xname, m->m_pkthdr.len); 488 drop: 489 ++ifp->if_ierrors; 490 ++ifp->if_iqdrops; 491 m_freem(m); 492 return; 493 } 494 495 if (sp->pp_flags & PP_NOFRAMING) { 496 memcpy(&protocol, mtod(m, void *), 2); 497 protocol = ntohs(protocol); 498 m_adj(m, 2); 499 } else { 500 501 /* Get PPP header. */ 502 h = mtod(m, struct ppp_header *); 503 m_adj(m, PPP_HEADER_LEN); 504 505 switch (h->address) { 506 case PPP_ALLSTATIONS: 507 if (h->control != PPP_UI) 508 goto invalid; 509 if (sp->pp_flags & PP_CISCO) { 510 if (debug) 511 log(LOG_DEBUG, 512 "%s: PPP packet in Cisco mode " 513 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 514 ifp->if_xname, 515 h->address, h->control, ntohs(h->protocol)); 516 goto drop; 517 } 518 break; 519 case CISCO_MULTICAST: 520 case CISCO_UNICAST: 521 /* Don't check the control field here (RFC 1547). */ 522 if (! (sp->pp_flags & PP_CISCO)) { 523 if (debug) 524 log(LOG_DEBUG, 525 "%s: Cisco packet in PPP mode " 526 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 527 ifp->if_xname, 528 h->address, h->control, ntohs(h->protocol)); 529 goto drop; 530 } 531 switch (ntohs(h->protocol)) { 532 default: 533 ++ifp->if_noproto; 534 goto invalid; 535 case CISCO_KEEPALIVE: 536 sppp_cisco_input((struct sppp *) ifp, m); 537 m_freem(m); 538 return; 539 #ifdef INET 540 case ETHERTYPE_IP: 541 schednetisr(NETISR_IP); 542 inq = &ipintrq; 543 break; 544 #endif 545 #ifdef INET6 546 case ETHERTYPE_IPV6: 547 schednetisr(NETISR_IPV6); 548 inq = &ip6intrq; 549 break; 550 #endif 551 #ifdef IPX 552 case ETHERTYPE_IPX: 553 schednetisr(NETISR_IPX); 554 inq = &ipxintrq; 555 break; 556 #endif 557 } 558 goto queue_pkt; 559 default: /* Invalid PPP packet. */ 560 invalid: 561 if (debug) 562 log(LOG_DEBUG, 563 "%s: invalid input packet " 564 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 565 ifp->if_xname, 566 h->address, h->control, ntohs(h->protocol)); 567 goto drop; 568 } 569 protocol = ntohs(h->protocol); 570 } 571 572 switch (protocol) { 573 default: 574 if (sp->state[IDX_LCP] == STATE_OPENED) { 575 uint16_t prot = htons(protocol); 576 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 577 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 578 &prot); 579 } 580 if (debug) 581 log(LOG_DEBUG, 582 "%s: invalid input protocol " 583 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 584 ++ifp->if_noproto; 585 goto drop; 586 case PPP_LCP: 587 sppp_cp_input(&lcp, sp, m); 588 m_freem(m); 589 return; 590 case PPP_PAP: 591 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 592 sppp_pap_input(sp, m); 593 m_freem(m); 594 return; 595 case PPP_CHAP: 596 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 597 sppp_chap_input(sp, m); 598 m_freem(m); 599 return; 600 #ifdef INET 601 case PPP_IPCP: 602 if (sp->pp_phase == SPPP_PHASE_NETWORK) 603 sppp_cp_input(&ipcp, sp, m); 604 m_freem(m); 605 return; 606 case PPP_IP: 607 if (sp->state[IDX_IPCP] == STATE_OPENED) { 608 schednetisr(NETISR_IP); 609 inq = &ipintrq; 610 sp->pp_last_activity = time_uptime; 611 } 612 break; 613 #endif 614 #ifdef INET6 615 case PPP_IPV6CP: 616 if (sp->pp_phase == SPPP_PHASE_NETWORK) 617 sppp_cp_input(&ipv6cp, sp, m); 618 m_freem(m); 619 return; 620 621 case PPP_IPV6: 622 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 623 schednetisr(NETISR_IPV6); 624 inq = &ip6intrq; 625 sp->pp_last_activity = time_uptime; 626 } 627 break; 628 #endif 629 #ifdef IPX 630 case PPP_IPX: 631 /* IPX IPXCP not implemented yet */ 632 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 633 schednetisr(NETISR_IPX); 634 inq = &ipxintrq; 635 } 636 break; 637 #endif 638 } 639 640 queue_pkt: 641 if (! (ifp->if_flags & IFF_UP) || ! inq) 642 goto drop; 643 644 /* Check queue. */ 645 s = splnet(); 646 if (IF_QFULL(inq)) { 647 /* Queue overflow. */ 648 IF_DROP(inq); 649 splx(s); 650 if (debug) 651 log(LOG_DEBUG, "%s: protocol queue overflow\n", 652 ifp->if_xname); 653 goto drop; 654 } 655 IF_ENQUEUE(inq, m); 656 splx(s); 657 } 658 659 /* 660 * Enqueue transmit packet. 661 */ 662 static int 663 sppp_output(struct ifnet *ifp, struct mbuf *m, 664 const struct sockaddr *dst, struct rtentry *rt) 665 { 666 struct sppp *sp = (struct sppp *) ifp; 667 struct ppp_header *h = NULL; 668 struct ifqueue *ifq = NULL; /* XXX */ 669 int s, error = 0; 670 uint16_t protocol; 671 ALTQ_DECL(struct altq_pktattr pktattr;) 672 673 s = splnet(); 674 675 sp->pp_last_activity = time_uptime; 676 677 if ((ifp->if_flags & IFF_UP) == 0 || 678 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 679 m_freem(m); 680 splx(s); 681 return (ENETDOWN); 682 } 683 684 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 685 /* 686 * Interface is not yet running, but auto-dial. Need 687 * to start LCP for it. 688 */ 689 ifp->if_flags |= IFF_RUNNING; 690 splx(s); 691 lcp.Open(sp); 692 s = splnet(); 693 } 694 695 /* 696 * If the queueing discipline needs packet classification, 697 * do it before prepending link headers. 698 */ 699 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 700 701 #ifdef INET 702 if (dst->sa_family == AF_INET) { 703 struct ip *ip = NULL; 704 struct tcphdr *th = NULL; 705 706 if (m->m_len >= sizeof(struct ip)) { 707 ip = mtod(m, struct ip *); 708 if (ip->ip_p == IPPROTO_TCP && 709 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 710 sizeof(struct tcphdr)) { 711 th = (struct tcphdr *) 712 ((char *)ip + (ip->ip_hl << 2)); 713 } 714 } else 715 ip = NULL; 716 717 /* 718 * When using dynamic local IP address assignment by using 719 * 0.0.0.0 as a local address, the first TCP session will 720 * not connect because the local TCP checksum is computed 721 * using 0.0.0.0 which will later become our real IP address 722 * so the TCP checksum computed at the remote end will 723 * become invalid. So we 724 * - don't let packets with src ip addr 0 thru 725 * - we flag TCP packets with src ip 0 as an error 726 */ 727 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 728 uint8_t proto = ip->ip_p; 729 730 m_freem(m); 731 splx(s); 732 if (proto == IPPROTO_TCP) 733 return (EADDRNOTAVAIL); 734 else 735 return (0); 736 } 737 738 /* 739 * Put low delay, telnet, rlogin and ftp control packets 740 * in front of the queue. 741 */ 742 743 if (!IF_QFULL(&sp->pp_fastq) && 744 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 745 (th && (INTERACTIVE(ntohs(th->th_sport)) || 746 INTERACTIVE(ntohs(th->th_dport)))))) 747 ifq = &sp->pp_fastq; 748 } 749 #endif 750 751 #ifdef INET6 752 if (dst->sa_family == AF_INET6) { 753 /* XXX do something tricky here? */ 754 } 755 #endif 756 757 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 758 /* 759 * Prepend general data packet PPP header. For now, IP only. 760 */ 761 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 762 if (! m) { 763 if (ifp->if_flags & IFF_DEBUG) 764 log(LOG_DEBUG, "%s: no memory for transmit header\n", 765 ifp->if_xname); 766 ++ifp->if_oerrors; 767 splx(s); 768 return (ENOBUFS); 769 } 770 /* 771 * May want to check size of packet 772 * (albeit due to the implementation it's always enough) 773 */ 774 h = mtod(m, struct ppp_header *); 775 if (sp->pp_flags & PP_CISCO) { 776 h->address = CISCO_UNICAST; /* unicast address */ 777 h->control = 0; 778 } else { 779 h->address = PPP_ALLSTATIONS; /* broadcast address */ 780 h->control = PPP_UI; /* Unnumbered Info */ 781 } 782 } 783 784 switch (dst->sa_family) { 785 #ifdef INET 786 case AF_INET: /* Internet Protocol */ 787 if (sp->pp_flags & PP_CISCO) 788 protocol = htons(ETHERTYPE_IP); 789 else { 790 /* 791 * Don't choke with an ENETDOWN early. It's 792 * possible that we just started dialing out, 793 * so don't drop the packet immediately. If 794 * we notice that we run out of buffer space 795 * below, we will however remember that we are 796 * not ready to carry IP packets, and return 797 * ENETDOWN, as opposed to ENOBUFS. 798 */ 799 protocol = htons(PPP_IP); 800 if (sp->state[IDX_IPCP] != STATE_OPENED) 801 error = ENETDOWN; 802 } 803 break; 804 #endif 805 #ifdef INET6 806 case AF_INET6: /* Internet Protocol version 6 */ 807 if (sp->pp_flags & PP_CISCO) 808 protocol = htons(ETHERTYPE_IPV6); 809 else { 810 /* 811 * Don't choke with an ENETDOWN early. It's 812 * possible that we just started dialing out, 813 * so don't drop the packet immediately. If 814 * we notice that we run out of buffer space 815 * below, we will however remember that we are 816 * not ready to carry IP packets, and return 817 * ENETDOWN, as opposed to ENOBUFS. 818 */ 819 protocol = htons(PPP_IPV6); 820 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 821 error = ENETDOWN; 822 } 823 break; 824 #endif 825 #ifdef IPX 826 case AF_IPX: /* Novell IPX Protocol */ 827 protocol = htons((sp->pp_flags & PP_CISCO) ? 828 ETHERTYPE_IPX : PPP_IPX); 829 break; 830 #endif 831 default: 832 m_freem(m); 833 ++ifp->if_oerrors; 834 splx(s); 835 return (EAFNOSUPPORT); 836 } 837 838 if (sp->pp_flags & PP_NOFRAMING) { 839 M_PREPEND(m, 2, M_DONTWAIT); 840 if (m == NULL) { 841 if (ifp->if_flags & IFF_DEBUG) 842 log(LOG_DEBUG, "%s: no memory for transmit header\n", 843 ifp->if_xname); 844 ++ifp->if_oerrors; 845 splx(s); 846 return (ENOBUFS); 847 } 848 *mtod(m, uint16_t *) = protocol; 849 } else { 850 h->protocol = protocol; 851 } 852 853 854 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 855 856 if (error == 0) { 857 /* 858 * Count output packets and bytes. 859 * The packet length includes header + additional hardware 860 * framing according to RFC 1333. 861 */ 862 if (!(ifp->if_flags & IFF_OACTIVE)) 863 (*ifp->if_start)(ifp); 864 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 865 } 866 splx(s); 867 return error; 868 } 869 870 void 871 sppp_attach(struct ifnet *ifp) 872 { 873 struct sppp *sp = (struct sppp *) ifp; 874 875 /* Initialize keepalive handler. */ 876 if (! spppq) { 877 callout_init(&keepalive_ch, 0); 878 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 879 } 880 881 /* Insert new entry into the keepalive list. */ 882 sp->pp_next = spppq; 883 spppq = sp; 884 885 sp->pp_if.if_type = IFT_PPP; 886 sp->pp_if.if_output = sppp_output; 887 sp->pp_fastq.ifq_maxlen = 32; 888 sp->pp_cpq.ifq_maxlen = 20; 889 sp->pp_loopcnt = 0; 890 sp->pp_alivecnt = 0; 891 sp->pp_last_activity = 0; 892 sp->pp_last_receive = 0; 893 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 894 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 895 sp->pp_idle_timeout = 0; 896 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 897 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 898 sp->pp_auth_failures = 0; 899 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 900 sp->pp_phase = SPPP_PHASE_DEAD; 901 sp->pp_up = lcp.Up; 902 sp->pp_down = lcp.Down; 903 904 if_alloc_sadl(ifp); 905 906 memset(&sp->myauth, 0, sizeof sp->myauth); 907 memset(&sp->hisauth, 0, sizeof sp->hisauth); 908 sppp_lcp_init(sp); 909 sppp_ipcp_init(sp); 910 sppp_ipv6cp_init(sp); 911 sppp_pap_init(sp); 912 sppp_chap_init(sp); 913 } 914 915 void 916 sppp_detach(struct ifnet *ifp) 917 { 918 struct sppp **q, *p, *sp = (struct sppp *) ifp; 919 920 /* Remove the entry from the keepalive list. */ 921 for (q = &spppq; (p = *q); q = &p->pp_next) 922 if (p == sp) { 923 *q = p->pp_next; 924 break; 925 } 926 927 /* Stop keepalive handler. */ 928 if (! spppq) { 929 callout_stop(&keepalive_ch); 930 } 931 932 callout_stop(&sp->ch[IDX_LCP]); 933 callout_stop(&sp->ch[IDX_IPCP]); 934 callout_stop(&sp->ch[IDX_PAP]); 935 callout_stop(&sp->ch[IDX_CHAP]); 936 #ifdef INET6 937 callout_stop(&sp->ch[IDX_IPV6CP]); 938 #endif 939 callout_stop(&sp->pap_my_to_ch); 940 941 /* free authentication info */ 942 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 943 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 944 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 945 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 946 947 #if 0 /* done in if_detach() */ 948 if_free_sadl(ifp); 949 #endif 950 } 951 952 /* 953 * Flush the interface output queue. 954 */ 955 void 956 sppp_flush(struct ifnet *ifp) 957 { 958 struct sppp *sp = (struct sppp *) ifp; 959 960 IFQ_PURGE(&sp->pp_if.if_snd); 961 IF_PURGE(&sp->pp_fastq); 962 IF_PURGE(&sp->pp_cpq); 963 } 964 965 /* 966 * Check if the output queue is empty. 967 */ 968 int 969 sppp_isempty(struct ifnet *ifp) 970 { 971 struct sppp *sp = (struct sppp *) ifp; 972 int empty, s; 973 974 s = splnet(); 975 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 976 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 977 splx(s); 978 return (empty); 979 } 980 981 /* 982 * Get next packet to send. 983 */ 984 struct mbuf * 985 sppp_dequeue(struct ifnet *ifp) 986 { 987 struct sppp *sp = (struct sppp *) ifp; 988 struct mbuf *m; 989 int s; 990 991 s = splnet(); 992 /* 993 * Process only the control protocol queue until we have at 994 * least one NCP open. 995 * 996 * Do always serve all three queues in Cisco mode. 997 */ 998 IF_DEQUEUE(&sp->pp_cpq, m); 999 if (m == NULL && 1000 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1001 IF_DEQUEUE(&sp->pp_fastq, m); 1002 if (m == NULL) 1003 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1004 } 1005 splx(s); 1006 return m; 1007 } 1008 1009 /* 1010 * Process an ioctl request. Called on low priority level. 1011 */ 1012 int 1013 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1014 { 1015 struct lwp *l = curlwp; /* XXX */ 1016 struct ifreq *ifr = (struct ifreq *) data; 1017 struct sppp *sp = (struct sppp *) ifp; 1018 int s, error=0, going_up, going_down, newmode; 1019 1020 s = splnet(); 1021 switch (cmd) { 1022 case SIOCINITIFADDR: 1023 break; 1024 1025 case SIOCSIFFLAGS: 1026 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1027 break; 1028 going_up = ifp->if_flags & IFF_UP && 1029 (ifp->if_flags & IFF_RUNNING) == 0; 1030 going_down = (ifp->if_flags & IFF_UP) == 0 && 1031 ifp->if_flags & IFF_RUNNING; 1032 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1033 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1034 /* sanity */ 1035 newmode = IFF_PASSIVE; 1036 ifp->if_flags &= ~IFF_AUTO; 1037 } 1038 1039 if (going_up || going_down) 1040 lcp.Close(sp); 1041 if (going_up && newmode == 0) { 1042 /* neither auto-dial nor passive */ 1043 ifp->if_flags |= IFF_RUNNING; 1044 if (!(sp->pp_flags & PP_CISCO)) 1045 lcp.Open(sp); 1046 } else if (going_down) { 1047 sppp_flush(ifp); 1048 ifp->if_flags &= ~IFF_RUNNING; 1049 } 1050 1051 break; 1052 1053 case SIOCSIFMTU: 1054 if (ifr->ifr_mtu < PPP_MINMRU || 1055 ifr->ifr_mtu > sp->lcp.their_mru) { 1056 error = EINVAL; 1057 break; 1058 } 1059 /*FALLTHROUGH*/ 1060 case SIOCGIFMTU: 1061 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1062 error = 0; 1063 break; 1064 case SIOCADDMULTI: 1065 case SIOCDELMULTI: 1066 break; 1067 1068 case SPPPSETAUTHCFG: 1069 case SPPPSETLCPCFG: 1070 case SPPPSETIDLETO: 1071 case SPPPSETAUTHFAILURE: 1072 case SPPPSETDNSOPTS: 1073 case SPPPSETKEEPALIVE: 1074 #if defined(COMPAT_50) || defined(MODULAR) 1075 case __SPPPSETIDLETO50: 1076 case __SPPPSETKEEPALIVE50: 1077 #endif /* COMPAT_50 || MODULAR */ 1078 error = kauth_authorize_network(l->l_cred, 1079 KAUTH_NETWORK_INTERFACE, 1080 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1081 NULL); 1082 if (error) 1083 break; 1084 error = sppp_params(sp, cmd, data); 1085 break; 1086 1087 case SPPPGETAUTHCFG: 1088 case SPPPGETLCPCFG: 1089 case SPPPGETAUTHFAILURES: 1090 error = kauth_authorize_network(l->l_cred, 1091 KAUTH_NETWORK_INTERFACE, 1092 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1093 NULL); 1094 if (error) 1095 break; 1096 error = sppp_params(sp, cmd, data); 1097 break; 1098 1099 case SPPPGETSTATUS: 1100 case SPPPGETSTATUSNCP: 1101 case SPPPGETIDLETO: 1102 case SPPPGETDNSOPTS: 1103 case SPPPGETDNSADDRS: 1104 case SPPPGETKEEPALIVE: 1105 #if defined(COMPAT_50) || defined(MODULAR) 1106 case __SPPPGETIDLETO50: 1107 case __SPPPGETKEEPALIVE50: 1108 #endif /* COMPAT_50 || MODULAR */ 1109 error = sppp_params(sp, cmd, data); 1110 break; 1111 1112 default: 1113 error = ifioctl_common(ifp, cmd, data); 1114 break; 1115 } 1116 splx(s); 1117 return (error); 1118 } 1119 1120 1121 /* 1122 * Cisco framing implementation. 1123 */ 1124 1125 /* 1126 * Handle incoming Cisco keepalive protocol packets. 1127 */ 1128 static void 1129 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1130 { 1131 STDDCL; 1132 struct cisco_packet *h; 1133 #ifdef INET 1134 uint32_t me, mymask = 0; /* XXX: GCC */ 1135 #endif 1136 1137 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1138 if (debug) 1139 log(LOG_DEBUG, 1140 "%s: cisco invalid packet length: %d bytes\n", 1141 ifp->if_xname, m->m_pkthdr.len); 1142 return; 1143 } 1144 h = mtod(m, struct cisco_packet *); 1145 if (debug) 1146 log(LOG_DEBUG, 1147 "%s: cisco input: %d bytes " 1148 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1149 ifp->if_xname, m->m_pkthdr.len, 1150 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1151 (u_int)h->time0, (u_int)h->time1); 1152 switch (ntohl(h->type)) { 1153 default: 1154 if (debug) 1155 addlog("%s: cisco unknown packet type: 0x%x\n", 1156 ifp->if_xname, ntohl(h->type)); 1157 break; 1158 case CISCO_ADDR_REPLY: 1159 /* Reply on address request, ignore */ 1160 break; 1161 case CISCO_KEEPALIVE_REQ: 1162 sp->pp_alivecnt = 0; 1163 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1164 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1165 /* Local and remote sequence numbers are equal. 1166 * Probably, the line is in loopback mode. */ 1167 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1168 printf ("%s: loopback\n", 1169 ifp->if_xname); 1170 sp->pp_loopcnt = 0; 1171 if (ifp->if_flags & IFF_UP) { 1172 if_down(ifp); 1173 IF_PURGE(&sp->pp_cpq); 1174 } 1175 } 1176 ++sp->pp_loopcnt; 1177 1178 /* Generate new local sequence number */ 1179 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1180 break; 1181 } 1182 sp->pp_loopcnt = 0; 1183 if (! (ifp->if_flags & IFF_UP) && 1184 (ifp->if_flags & IFF_RUNNING)) { 1185 if_up(ifp); 1186 } 1187 break; 1188 case CISCO_ADDR_REQ: 1189 #ifdef INET 1190 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1191 if (me != 0L) 1192 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1193 #endif 1194 break; 1195 } 1196 } 1197 1198 /* 1199 * Send Cisco keepalive packet. 1200 */ 1201 static void 1202 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1203 { 1204 STDDCL; 1205 struct ppp_header *h; 1206 struct cisco_packet *ch; 1207 struct mbuf *m; 1208 uint32_t t; 1209 1210 t = time_uptime * 1000; 1211 MGETHDR(m, M_DONTWAIT, MT_DATA); 1212 if (! m) 1213 return; 1214 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1215 m->m_pkthdr.rcvif = 0; 1216 1217 h = mtod(m, struct ppp_header *); 1218 h->address = CISCO_MULTICAST; 1219 h->control = 0; 1220 h->protocol = htons(CISCO_KEEPALIVE); 1221 1222 ch = (struct cisco_packet *)(h + 1); 1223 ch->type = htonl(type); 1224 ch->par1 = htonl(par1); 1225 ch->par2 = htonl(par2); 1226 ch->rel = -1; 1227 1228 ch->time0 = htons((u_short)(t >> 16)); 1229 ch->time1 = htons((u_short) t); 1230 1231 if (debug) 1232 log(LOG_DEBUG, 1233 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1234 ifp->if_xname, ntohl(ch->type), ch->par1, 1235 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1236 (u_int)ch->time1); 1237 1238 if (IF_QFULL(&sp->pp_cpq)) { 1239 IF_DROP(&sp->pp_fastq); 1240 IF_DROP(&ifp->if_snd); 1241 m_freem(m); 1242 ++ifp->if_oerrors; 1243 return; 1244 } else 1245 IF_ENQUEUE(&sp->pp_cpq, m); 1246 if (! (ifp->if_flags & IFF_OACTIVE)) 1247 (*ifp->if_start)(ifp); 1248 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1249 } 1250 1251 /* 1252 * PPP protocol implementation. 1253 */ 1254 1255 /* 1256 * Send PPP control protocol packet. 1257 */ 1258 static void 1259 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1260 u_char ident, u_short len, void *data) 1261 { 1262 STDDCL; 1263 struct lcp_header *lh; 1264 struct mbuf *m; 1265 size_t pkthdrlen; 1266 1267 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1268 1269 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1270 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1271 MGETHDR(m, M_DONTWAIT, MT_DATA); 1272 if (! m) 1273 return; 1274 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1275 m->m_pkthdr.rcvif = 0; 1276 1277 if (sp->pp_flags & PP_NOFRAMING) { 1278 *mtod(m, uint16_t *) = htons(proto); 1279 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1280 } else { 1281 struct ppp_header *h; 1282 h = mtod(m, struct ppp_header *); 1283 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1284 h->control = PPP_UI; /* Unnumbered Info */ 1285 h->protocol = htons(proto); /* Link Control Protocol */ 1286 lh = (struct lcp_header *)(h + 1); 1287 } 1288 lh->type = type; 1289 lh->ident = ident; 1290 lh->len = htons(LCP_HEADER_LEN + len); 1291 if (len) 1292 bcopy (data, lh + 1, len); 1293 1294 if (debug) { 1295 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1296 ifp->if_xname, 1297 sppp_proto_name(proto), 1298 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1299 if (len) 1300 sppp_print_bytes((u_char *)(lh + 1), len); 1301 addlog(">\n"); 1302 } 1303 if (IF_QFULL(&sp->pp_cpq)) { 1304 IF_DROP(&sp->pp_fastq); 1305 IF_DROP(&ifp->if_snd); 1306 m_freem(m); 1307 ++ifp->if_oerrors; 1308 return; 1309 } else 1310 IF_ENQUEUE(&sp->pp_cpq, m); 1311 if (! (ifp->if_flags & IFF_OACTIVE)) 1312 (*ifp->if_start)(ifp); 1313 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1314 } 1315 1316 /* 1317 * Handle incoming PPP control protocol packets. 1318 */ 1319 static void 1320 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1321 { 1322 STDDCL; 1323 struct lcp_header *h; 1324 int printlen, len = m->m_pkthdr.len; 1325 int rv; 1326 u_char *p; 1327 uint32_t u32; 1328 1329 if (len < 4) { 1330 if (debug) 1331 log(LOG_DEBUG, 1332 "%s: %s invalid packet length: %d bytes\n", 1333 ifp->if_xname, cp->name, len); 1334 return; 1335 } 1336 h = mtod(m, struct lcp_header *); 1337 if (debug) { 1338 printlen = ntohs(h->len); 1339 log(LOG_DEBUG, 1340 "%s: %s input(%s): <%s id=0x%x len=%d", 1341 ifp->if_xname, cp->name, 1342 sppp_state_name(sp->state[cp->protoidx]), 1343 sppp_cp_type_name(h->type), h->ident, printlen); 1344 if (len < printlen) 1345 printlen = len; 1346 if (printlen > 4) 1347 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1348 addlog(">\n"); 1349 } 1350 if (len > ntohs(h->len)) 1351 len = ntohs(h->len); 1352 p = (u_char *)(h + 1); 1353 switch (h->type) { 1354 case CONF_REQ: 1355 if (len < 4) { 1356 if (debug) 1357 addlog("%s: %s invalid conf-req length %d\n", 1358 ifp->if_xname, cp->name, 1359 len); 1360 ++ifp->if_ierrors; 1361 break; 1362 } 1363 /* handle states where RCR doesn't get a SCA/SCN */ 1364 switch (sp->state[cp->protoidx]) { 1365 case STATE_CLOSING: 1366 case STATE_STOPPING: 1367 return; 1368 case STATE_CLOSED: 1369 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1370 0, 0); 1371 return; 1372 } 1373 rv = (cp->RCR)(sp, h, len); 1374 if (rv < 0) { 1375 /* fatal error, shut down */ 1376 (cp->tld)(sp); 1377 sppp_lcp_tlf(sp); 1378 return; 1379 } 1380 switch (sp->state[cp->protoidx]) { 1381 case STATE_OPENED: 1382 (cp->tld)(sp); 1383 (cp->scr)(sp); 1384 /* fall through... */ 1385 case STATE_ACK_SENT: 1386 case STATE_REQ_SENT: 1387 sppp_cp_change_state(cp, sp, rv? 1388 STATE_ACK_SENT: STATE_REQ_SENT); 1389 break; 1390 case STATE_STOPPED: 1391 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1392 (cp->scr)(sp); 1393 sppp_cp_change_state(cp, sp, rv? 1394 STATE_ACK_SENT: STATE_REQ_SENT); 1395 break; 1396 case STATE_ACK_RCVD: 1397 if (rv) { 1398 sppp_cp_change_state(cp, sp, STATE_OPENED); 1399 if (debug) 1400 log(LOG_DEBUG, "%s: %s tlu\n", 1401 ifp->if_xname, 1402 cp->name); 1403 (cp->tlu)(sp); 1404 } else 1405 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1406 break; 1407 default: 1408 printf("%s: %s illegal %s in state %s\n", 1409 ifp->if_xname, cp->name, 1410 sppp_cp_type_name(h->type), 1411 sppp_state_name(sp->state[cp->protoidx])); 1412 ++ifp->if_ierrors; 1413 } 1414 break; 1415 case CONF_ACK: 1416 if (h->ident != sp->confid[cp->protoidx]) { 1417 if (debug) 1418 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1419 ifp->if_xname, cp->name, 1420 h->ident, sp->confid[cp->protoidx]); 1421 ++ifp->if_ierrors; 1422 break; 1423 } 1424 switch (sp->state[cp->protoidx]) { 1425 case STATE_CLOSED: 1426 case STATE_STOPPED: 1427 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1428 break; 1429 case STATE_CLOSING: 1430 case STATE_STOPPING: 1431 break; 1432 case STATE_REQ_SENT: 1433 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1434 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1435 break; 1436 case STATE_OPENED: 1437 (cp->tld)(sp); 1438 /* fall through */ 1439 case STATE_ACK_RCVD: 1440 (cp->scr)(sp); 1441 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1442 break; 1443 case STATE_ACK_SENT: 1444 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1445 sppp_cp_change_state(cp, sp, STATE_OPENED); 1446 if (debug) 1447 log(LOG_DEBUG, "%s: %s tlu\n", 1448 ifp->if_xname, cp->name); 1449 (cp->tlu)(sp); 1450 break; 1451 default: 1452 printf("%s: %s illegal %s in state %s\n", 1453 ifp->if_xname, cp->name, 1454 sppp_cp_type_name(h->type), 1455 sppp_state_name(sp->state[cp->protoidx])); 1456 ++ifp->if_ierrors; 1457 } 1458 break; 1459 case CONF_NAK: 1460 case CONF_REJ: 1461 if (h->ident != sp->confid[cp->protoidx]) { 1462 if (debug) 1463 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1464 ifp->if_xname, cp->name, 1465 h->ident, sp->confid[cp->protoidx]); 1466 ++ifp->if_ierrors; 1467 break; 1468 } 1469 if (h->type == CONF_NAK) 1470 (cp->RCN_nak)(sp, h, len); 1471 else /* CONF_REJ */ 1472 (cp->RCN_rej)(sp, h, len); 1473 1474 switch (sp->state[cp->protoidx]) { 1475 case STATE_CLOSED: 1476 case STATE_STOPPED: 1477 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1478 break; 1479 case STATE_REQ_SENT: 1480 case STATE_ACK_SENT: 1481 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1482 (cp->scr)(sp); 1483 break; 1484 case STATE_OPENED: 1485 (cp->tld)(sp); 1486 /* fall through */ 1487 case STATE_ACK_RCVD: 1488 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1489 (cp->scr)(sp); 1490 break; 1491 case STATE_CLOSING: 1492 case STATE_STOPPING: 1493 break; 1494 default: 1495 printf("%s: %s illegal %s in state %s\n", 1496 ifp->if_xname, cp->name, 1497 sppp_cp_type_name(h->type), 1498 sppp_state_name(sp->state[cp->protoidx])); 1499 ++ifp->if_ierrors; 1500 } 1501 break; 1502 1503 case TERM_REQ: 1504 switch (sp->state[cp->protoidx]) { 1505 case STATE_ACK_RCVD: 1506 case STATE_ACK_SENT: 1507 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1508 /* fall through */ 1509 case STATE_CLOSED: 1510 case STATE_STOPPED: 1511 case STATE_CLOSING: 1512 case STATE_STOPPING: 1513 case STATE_REQ_SENT: 1514 sta: 1515 /* Send Terminate-Ack packet. */ 1516 if (debug) 1517 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1518 ifp->if_xname, cp->name); 1519 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1520 break; 1521 case STATE_OPENED: 1522 (cp->tld)(sp); 1523 sp->rst_counter[cp->protoidx] = 0; 1524 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1525 goto sta; 1526 default: 1527 printf("%s: %s illegal %s in state %s\n", 1528 ifp->if_xname, cp->name, 1529 sppp_cp_type_name(h->type), 1530 sppp_state_name(sp->state[cp->protoidx])); 1531 ++ifp->if_ierrors; 1532 } 1533 break; 1534 case TERM_ACK: 1535 switch (sp->state[cp->protoidx]) { 1536 case STATE_CLOSED: 1537 case STATE_STOPPED: 1538 case STATE_REQ_SENT: 1539 case STATE_ACK_SENT: 1540 break; 1541 case STATE_CLOSING: 1542 (cp->tlf)(sp); 1543 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1544 sppp_lcp_check_and_close(sp); 1545 break; 1546 case STATE_STOPPING: 1547 (cp->tlf)(sp); 1548 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1549 sppp_lcp_check_and_close(sp); 1550 break; 1551 case STATE_ACK_RCVD: 1552 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1553 break; 1554 case STATE_OPENED: 1555 (cp->tld)(sp); 1556 (cp->scr)(sp); 1557 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1558 break; 1559 default: 1560 printf("%s: %s illegal %s in state %s\n", 1561 ifp->if_xname, cp->name, 1562 sppp_cp_type_name(h->type), 1563 sppp_state_name(sp->state[cp->protoidx])); 1564 ++ifp->if_ierrors; 1565 } 1566 break; 1567 case CODE_REJ: 1568 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1569 log(LOG_INFO, 1570 "%s: %s: ignoring RXJ (%s) for code ?, " 1571 "danger will robinson\n", 1572 ifp->if_xname, cp->name, 1573 sppp_cp_type_name(h->type)); 1574 switch (sp->state[cp->protoidx]) { 1575 case STATE_CLOSED: 1576 case STATE_STOPPED: 1577 case STATE_REQ_SENT: 1578 case STATE_ACK_SENT: 1579 case STATE_CLOSING: 1580 case STATE_STOPPING: 1581 case STATE_OPENED: 1582 break; 1583 case STATE_ACK_RCVD: 1584 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1585 break; 1586 default: 1587 printf("%s: %s illegal %s in state %s\n", 1588 ifp->if_xname, cp->name, 1589 sppp_cp_type_name(h->type), 1590 sppp_state_name(sp->state[cp->protoidx])); 1591 ++ifp->if_ierrors; 1592 } 1593 break; 1594 case PROTO_REJ: 1595 { 1596 int catastrophic; 1597 const struct cp *upper; 1598 int i; 1599 uint16_t proto; 1600 1601 catastrophic = 0; 1602 upper = NULL; 1603 proto = p[0] << 8 | p[1]; 1604 for (i = 0; i < IDX_COUNT; i++) { 1605 if (cps[i]->proto == proto) { 1606 upper = cps[i]; 1607 break; 1608 } 1609 } 1610 if (upper == NULL) 1611 catastrophic++; 1612 1613 if (debug) 1614 log(LOG_INFO, 1615 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1616 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1617 sppp_cp_type_name(h->type), proto, 1618 upper ? upper->name : "unknown", 1619 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1620 1621 /* 1622 * if we got RXJ+ against conf-req, the peer does not implement 1623 * this particular protocol type. terminate the protocol. 1624 */ 1625 if (upper && !catastrophic) { 1626 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1627 upper->Close(sp); 1628 break; 1629 } 1630 } 1631 1632 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1633 switch (sp->state[cp->protoidx]) { 1634 case STATE_CLOSED: 1635 case STATE_STOPPED: 1636 case STATE_REQ_SENT: 1637 case STATE_ACK_SENT: 1638 case STATE_CLOSING: 1639 case STATE_STOPPING: 1640 case STATE_OPENED: 1641 break; 1642 case STATE_ACK_RCVD: 1643 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1644 break; 1645 default: 1646 printf("%s: %s illegal %s in state %s\n", 1647 ifp->if_xname, cp->name, 1648 sppp_cp_type_name(h->type), 1649 sppp_state_name(sp->state[cp->protoidx])); 1650 ++ifp->if_ierrors; 1651 } 1652 break; 1653 } 1654 case DISC_REQ: 1655 if (cp->proto != PPP_LCP) 1656 goto illegal; 1657 /* Discard the packet. */ 1658 break; 1659 case ECHO_REQ: 1660 if (cp->proto != PPP_LCP) 1661 goto illegal; 1662 if (sp->state[cp->protoidx] != STATE_OPENED) { 1663 if (debug) 1664 addlog("%s: lcp echo req but lcp closed\n", 1665 ifp->if_xname); 1666 ++ifp->if_ierrors; 1667 break; 1668 } 1669 if (len < 8) { 1670 if (debug) 1671 addlog("%s: invalid lcp echo request " 1672 "packet length: %d bytes\n", 1673 ifp->if_xname, len); 1674 break; 1675 } 1676 memcpy(&u32, h + 1, sizeof u32); 1677 if (ntohl(u32) == sp->lcp.magic) { 1678 /* Line loopback mode detected. */ 1679 printf("%s: loopback\n", ifp->if_xname); 1680 if_down(ifp); 1681 IF_PURGE(&sp->pp_cpq); 1682 1683 /* Shut down the PPP link. */ 1684 /* XXX */ 1685 lcp.Down(sp); 1686 lcp.Up(sp); 1687 break; 1688 } 1689 u32 = htonl(sp->lcp.magic); 1690 memcpy(h + 1, &u32, sizeof u32); 1691 if (debug) 1692 addlog("%s: got lcp echo req, sending echo rep\n", 1693 ifp->if_xname); 1694 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1695 h + 1); 1696 break; 1697 case ECHO_REPLY: 1698 if (cp->proto != PPP_LCP) 1699 goto illegal; 1700 if (h->ident != sp->lcp.echoid) { 1701 ++ifp->if_ierrors; 1702 break; 1703 } 1704 if (len < 8) { 1705 if (debug) 1706 addlog("%s: lcp invalid echo reply " 1707 "packet length: %d bytes\n", 1708 ifp->if_xname, len); 1709 break; 1710 } 1711 if (debug) 1712 addlog("%s: lcp got echo rep\n", 1713 ifp->if_xname); 1714 memcpy(&u32, h + 1, sizeof u32); 1715 if (ntohl(u32) != sp->lcp.magic) 1716 sp->pp_alivecnt = 0; 1717 break; 1718 default: 1719 /* Unknown packet type -- send Code-Reject packet. */ 1720 illegal: 1721 if (debug) 1722 addlog("%s: %s send code-rej for 0x%x\n", 1723 ifp->if_xname, cp->name, h->type); 1724 sppp_cp_send(sp, cp->proto, CODE_REJ, 1725 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1726 ++ifp->if_ierrors; 1727 } 1728 } 1729 1730 1731 /* 1732 * The generic part of all Up/Down/Open/Close/TO event handlers. 1733 * Basically, the state transition handling in the automaton. 1734 */ 1735 static void 1736 sppp_up_event(const struct cp *cp, struct sppp *sp) 1737 { 1738 STDDCL; 1739 1740 if (debug) 1741 log(LOG_DEBUG, "%s: %s up(%s)\n", 1742 ifp->if_xname, cp->name, 1743 sppp_state_name(sp->state[cp->protoidx])); 1744 1745 switch (sp->state[cp->protoidx]) { 1746 case STATE_INITIAL: 1747 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1748 break; 1749 case STATE_STARTING: 1750 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1751 (cp->scr)(sp); 1752 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1753 break; 1754 default: 1755 printf("%s: %s illegal up in state %s\n", 1756 ifp->if_xname, cp->name, 1757 sppp_state_name(sp->state[cp->protoidx])); 1758 } 1759 } 1760 1761 static void 1762 sppp_down_event(const struct cp *cp, struct sppp *sp) 1763 { 1764 STDDCL; 1765 1766 if (debug) 1767 log(LOG_DEBUG, "%s: %s down(%s)\n", 1768 ifp->if_xname, cp->name, 1769 sppp_state_name(sp->state[cp->protoidx])); 1770 1771 switch (sp->state[cp->protoidx]) { 1772 case STATE_CLOSED: 1773 case STATE_CLOSING: 1774 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1775 break; 1776 case STATE_STOPPED: 1777 (cp->tls)(sp); 1778 /* fall through */ 1779 case STATE_STOPPING: 1780 case STATE_REQ_SENT: 1781 case STATE_ACK_RCVD: 1782 case STATE_ACK_SENT: 1783 sppp_cp_change_state(cp, sp, STATE_STARTING); 1784 break; 1785 case STATE_OPENED: 1786 (cp->tld)(sp); 1787 sppp_cp_change_state(cp, sp, STATE_STARTING); 1788 break; 1789 default: 1790 printf("%s: %s illegal down in state %s\n", 1791 ifp->if_xname, cp->name, 1792 sppp_state_name(sp->state[cp->protoidx])); 1793 } 1794 } 1795 1796 1797 static void 1798 sppp_open_event(const struct cp *cp, struct sppp *sp) 1799 { 1800 STDDCL; 1801 1802 if (debug) 1803 log(LOG_DEBUG, "%s: %s open(%s)\n", 1804 ifp->if_xname, cp->name, 1805 sppp_state_name(sp->state[cp->protoidx])); 1806 1807 switch (sp->state[cp->protoidx]) { 1808 case STATE_INITIAL: 1809 sppp_cp_change_state(cp, sp, STATE_STARTING); 1810 (cp->tls)(sp); 1811 break; 1812 case STATE_STARTING: 1813 break; 1814 case STATE_CLOSED: 1815 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1816 (cp->scr)(sp); 1817 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1818 break; 1819 case STATE_STOPPED: 1820 case STATE_STOPPING: 1821 case STATE_REQ_SENT: 1822 case STATE_ACK_RCVD: 1823 case STATE_ACK_SENT: 1824 case STATE_OPENED: 1825 break; 1826 case STATE_CLOSING: 1827 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1828 break; 1829 } 1830 } 1831 1832 1833 static void 1834 sppp_close_event(const struct cp *cp, struct sppp *sp) 1835 { 1836 STDDCL; 1837 1838 if (debug) 1839 log(LOG_DEBUG, "%s: %s close(%s)\n", 1840 ifp->if_xname, cp->name, 1841 sppp_state_name(sp->state[cp->protoidx])); 1842 1843 switch (sp->state[cp->protoidx]) { 1844 case STATE_INITIAL: 1845 case STATE_CLOSED: 1846 case STATE_CLOSING: 1847 break; 1848 case STATE_STARTING: 1849 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1850 (cp->tlf)(sp); 1851 break; 1852 case STATE_STOPPED: 1853 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1854 break; 1855 case STATE_STOPPING: 1856 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1857 break; 1858 case STATE_OPENED: 1859 (cp->tld)(sp); 1860 /* fall through */ 1861 case STATE_REQ_SENT: 1862 case STATE_ACK_RCVD: 1863 case STATE_ACK_SENT: 1864 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1865 sppp_cp_send(sp, cp->proto, TERM_REQ, 1866 ++sp->pp_seq[cp->protoidx], 0, 0); 1867 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1868 break; 1869 } 1870 } 1871 1872 static void 1873 sppp_to_event(const struct cp *cp, struct sppp *sp) 1874 { 1875 STDDCL; 1876 int s; 1877 1878 s = splnet(); 1879 if (debug) 1880 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1881 ifp->if_xname, cp->name, 1882 sppp_state_name(sp->state[cp->protoidx]), 1883 sp->rst_counter[cp->protoidx]); 1884 1885 if (--sp->rst_counter[cp->protoidx] < 0) 1886 /* TO- event */ 1887 switch (sp->state[cp->protoidx]) { 1888 case STATE_CLOSING: 1889 (cp->tlf)(sp); 1890 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1891 sppp_lcp_check_and_close(sp); 1892 break; 1893 case STATE_STOPPING: 1894 (cp->tlf)(sp); 1895 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1896 sppp_lcp_check_and_close(sp); 1897 break; 1898 case STATE_REQ_SENT: 1899 case STATE_ACK_RCVD: 1900 case STATE_ACK_SENT: 1901 (cp->tlf)(sp); 1902 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1903 sppp_lcp_check_and_close(sp); 1904 break; 1905 } 1906 else 1907 /* TO+ event */ 1908 switch (sp->state[cp->protoidx]) { 1909 case STATE_CLOSING: 1910 case STATE_STOPPING: 1911 sppp_cp_send(sp, cp->proto, TERM_REQ, 1912 ++sp->pp_seq[cp->protoidx], 0, 0); 1913 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1914 cp->TO, sp); 1915 break; 1916 case STATE_REQ_SENT: 1917 case STATE_ACK_RCVD: 1918 (cp->scr)(sp); 1919 /* sppp_cp_change_state() will restart the timer */ 1920 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1921 break; 1922 case STATE_ACK_SENT: 1923 (cp->scr)(sp); 1924 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1925 cp->TO, sp); 1926 break; 1927 } 1928 1929 splx(s); 1930 } 1931 1932 /* 1933 * Change the state of a control protocol in the state automaton. 1934 * Takes care of starting/stopping the restart timer. 1935 */ 1936 void 1937 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1938 { 1939 sp->state[cp->protoidx] = newstate; 1940 callout_stop(&sp->ch[cp->protoidx]); 1941 switch (newstate) { 1942 case STATE_INITIAL: 1943 case STATE_STARTING: 1944 case STATE_CLOSED: 1945 case STATE_STOPPED: 1946 case STATE_OPENED: 1947 break; 1948 case STATE_CLOSING: 1949 case STATE_STOPPING: 1950 case STATE_REQ_SENT: 1951 case STATE_ACK_RCVD: 1952 case STATE_ACK_SENT: 1953 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1954 cp->TO, sp); 1955 break; 1956 } 1957 } 1958 1959 /* 1960 *--------------------------------------------------------------------------* 1961 * * 1962 * The LCP implementation. * 1963 * * 1964 *--------------------------------------------------------------------------* 1965 */ 1966 static void 1967 sppp_lcp_init(struct sppp *sp) 1968 { 1969 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1970 sp->lcp.magic = 0; 1971 sp->state[IDX_LCP] = STATE_INITIAL; 1972 sp->fail_counter[IDX_LCP] = 0; 1973 sp->pp_seq[IDX_LCP] = 0; 1974 sp->pp_rseq[IDX_LCP] = 0; 1975 sp->lcp.protos = 0; 1976 1977 /* 1978 * Initialize counters and timeout values. Note that we don't 1979 * use the 3 seconds suggested in RFC 1661 since we are likely 1980 * running on a fast link. XXX We should probably implement 1981 * the exponential backoff option. Note that these values are 1982 * relevant for all control protocols, not just LCP only. 1983 */ 1984 sp->lcp.timeout = 1 * hz; 1985 sp->lcp.max_terminate = 2; 1986 sp->lcp.max_configure = 10; 1987 sp->lcp.max_failure = 10; 1988 callout_init(&sp->ch[IDX_LCP], 0); 1989 } 1990 1991 static void 1992 sppp_lcp_up(struct sppp *sp) 1993 { 1994 STDDCL; 1995 1996 /* Initialize activity timestamp: opening a connection is an activity */ 1997 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 1998 1999 /* 2000 * If this interface is passive or dial-on-demand, and we are 2001 * still in Initial state, it means we've got an incoming 2002 * call. Activate the interface. 2003 */ 2004 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2005 if (debug) 2006 log(LOG_DEBUG, 2007 "%s: Up event", ifp->if_xname); 2008 ifp->if_flags |= IFF_RUNNING; 2009 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2010 if (debug) 2011 addlog("(incoming call)\n"); 2012 sp->pp_flags |= PP_CALLIN; 2013 lcp.Open(sp); 2014 } else if (debug) 2015 addlog("\n"); 2016 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2017 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2018 ifp->if_flags |= IFF_RUNNING; 2019 lcp.Open(sp); 2020 } 2021 2022 sppp_up_event(&lcp, sp); 2023 } 2024 2025 static void 2026 sppp_lcp_down(struct sppp *sp) 2027 { 2028 STDDCL; 2029 2030 sppp_down_event(&lcp, sp); 2031 2032 /* 2033 * If this is neither a dial-on-demand nor a passive 2034 * interface, simulate an ``ifconfig down'' action, so the 2035 * administrator can force a redial by another ``ifconfig 2036 * up''. XXX For leased line operation, should we immediately 2037 * try to reopen the connection here? 2038 */ 2039 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2040 if (debug) 2041 log(LOG_INFO, 2042 "%s: Down event (carrier loss), taking interface down.\n", 2043 ifp->if_xname); 2044 if_down(ifp); 2045 } else { 2046 if (debug) 2047 log(LOG_DEBUG, 2048 "%s: Down event (carrier loss)\n", 2049 ifp->if_xname); 2050 } 2051 sp->pp_flags &= ~PP_CALLIN; 2052 if (sp->state[IDX_LCP] != STATE_INITIAL) 2053 lcp.Close(sp); 2054 ifp->if_flags &= ~IFF_RUNNING; 2055 } 2056 2057 static void 2058 sppp_lcp_open(struct sppp *sp) 2059 { 2060 if (sp->pp_if.if_mtu < PP_MTU) { 2061 sp->lcp.mru = sp->pp_if.if_mtu; 2062 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2063 } else 2064 sp->lcp.mru = PP_MTU; 2065 sp->lcp.their_mru = PP_MTU; 2066 2067 /* 2068 * If we are authenticator, negotiate LCP_AUTH 2069 */ 2070 if (sp->hisauth.proto != 0) 2071 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2072 else 2073 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2074 sp->pp_flags &= ~PP_NEEDAUTH; 2075 sppp_open_event(&lcp, sp); 2076 } 2077 2078 static void 2079 sppp_lcp_close(struct sppp *sp) 2080 { 2081 sppp_close_event(&lcp, sp); 2082 } 2083 2084 static void 2085 sppp_lcp_TO(void *cookie) 2086 { 2087 sppp_to_event(&lcp, (struct sppp *)cookie); 2088 } 2089 2090 /* 2091 * Analyze a configure request. Return true if it was agreeable, and 2092 * caused action sca, false if it has been rejected or nak'ed, and 2093 * caused action scn. (The return value is used to make the state 2094 * transition decision in the state automaton.) 2095 */ 2096 static int 2097 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2098 { 2099 STDDCL; 2100 u_char *buf, *r, *p; 2101 int origlen, rlen; 2102 uint32_t nmagic; 2103 u_short authproto; 2104 2105 len -= 4; 2106 origlen = len; 2107 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2108 if (! buf) 2109 return (0); 2110 2111 if (debug) 2112 log(LOG_DEBUG, "%s: lcp parse opts:", 2113 ifp->if_xname); 2114 2115 /* pass 1: check for things that need to be rejected */ 2116 p = (void *)(h + 1); 2117 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2118 /* Sanity check option length */ 2119 if (p[1] > len) { 2120 /* 2121 * Malicious option - drop immediately. 2122 * XXX Maybe we should just RXJ it? 2123 */ 2124 addlog("%s: received malicious LCP option 0x%02x, " 2125 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2126 p[0], p[1], len); 2127 goto drop; 2128 } 2129 if (debug) 2130 addlog(" %s", sppp_lcp_opt_name(*p)); 2131 switch (*p) { 2132 case LCP_OPT_MAGIC: 2133 /* Magic number. */ 2134 /* fall through, both are same length */ 2135 case LCP_OPT_ASYNC_MAP: 2136 /* Async control character map. */ 2137 if (len >= 6 || p[1] == 6) 2138 continue; 2139 if (debug) 2140 addlog(" [invalid]"); 2141 break; 2142 case LCP_OPT_MRU: 2143 /* Maximum receive unit. */ 2144 if (len >= 4 && p[1] == 4) 2145 continue; 2146 if (debug) 2147 addlog(" [invalid]"); 2148 break; 2149 case LCP_OPT_AUTH_PROTO: 2150 if (len < 4) { 2151 if (debug) 2152 addlog(" [invalid]"); 2153 break; 2154 } 2155 authproto = (p[2] << 8) + p[3]; 2156 if (authproto == PPP_CHAP && p[1] != 5) { 2157 if (debug) 2158 addlog(" [invalid chap len]"); 2159 break; 2160 } 2161 if (sp->myauth.proto == 0) { 2162 /* we are not configured to do auth */ 2163 if (debug) 2164 addlog(" [not configured]"); 2165 break; 2166 } 2167 /* 2168 * Remote want us to authenticate, remember this, 2169 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2170 * up. 2171 */ 2172 sp->pp_flags |= PP_NEEDAUTH; 2173 continue; 2174 default: 2175 /* Others not supported. */ 2176 if (debug) 2177 addlog(" [rej]"); 2178 break; 2179 } 2180 /* Add the option to rejected list. */ 2181 bcopy (p, r, p[1]); 2182 r += p[1]; 2183 rlen += p[1]; 2184 } 2185 if (rlen) { 2186 if (debug) 2187 addlog(" send conf-rej\n"); 2188 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2189 goto end; 2190 } else if (debug) 2191 addlog("\n"); 2192 2193 /* 2194 * pass 2: check for option values that are unacceptable and 2195 * thus require to be nak'ed. 2196 */ 2197 if (debug) 2198 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2199 ifp->if_xname); 2200 2201 p = (void *)(h + 1); 2202 len = origlen; 2203 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2204 if (debug) 2205 addlog(" %s", sppp_lcp_opt_name(*p)); 2206 switch (*p) { 2207 case LCP_OPT_MAGIC: 2208 /* Magic number -- extract. */ 2209 nmagic = (uint32_t)p[2] << 24 | 2210 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2211 if (nmagic != sp->lcp.magic) { 2212 if (debug) 2213 addlog(" 0x%x", nmagic); 2214 continue; 2215 } 2216 /* 2217 * Local and remote magics equal -- loopback? 2218 */ 2219 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2220 printf ("%s: loopback\n", 2221 ifp->if_xname); 2222 sp->pp_loopcnt = 0; 2223 if (ifp->if_flags & IFF_UP) { 2224 if_down(ifp); 2225 IF_PURGE(&sp->pp_cpq); 2226 /* XXX ? */ 2227 lcp.Down(sp); 2228 lcp.Up(sp); 2229 } 2230 } else if (debug) 2231 addlog(" [glitch]"); 2232 ++sp->pp_loopcnt; 2233 /* 2234 * We negate our magic here, and NAK it. If 2235 * we see it later in an NAK packet, we 2236 * suggest a new one. 2237 */ 2238 nmagic = ~sp->lcp.magic; 2239 /* Gonna NAK it. */ 2240 p[2] = nmagic >> 24; 2241 p[3] = nmagic >> 16; 2242 p[4] = nmagic >> 8; 2243 p[5] = nmagic; 2244 break; 2245 2246 case LCP_OPT_ASYNC_MAP: 2247 /* 2248 * Async control character map -- just ignore it. 2249 * 2250 * Quote from RFC 1662, chapter 6: 2251 * To enable this functionality, synchronous PPP 2252 * implementations MUST always respond to the 2253 * Async-Control-Character-Map Configuration 2254 * Option with the LCP Configure-Ack. However, 2255 * acceptance of the Configuration Option does 2256 * not imply that the synchronous implementation 2257 * will do any ACCM mapping. Instead, all such 2258 * octet mapping will be performed by the 2259 * asynchronous-to-synchronous converter. 2260 */ 2261 continue; 2262 2263 case LCP_OPT_MRU: 2264 /* 2265 * Maximum receive unit. Always agreeable, 2266 * but ignored by now. 2267 */ 2268 sp->lcp.their_mru = p[2] * 256 + p[3]; 2269 if (debug) 2270 addlog(" %ld", sp->lcp.their_mru); 2271 continue; 2272 2273 case LCP_OPT_AUTH_PROTO: 2274 authproto = (p[2] << 8) + p[3]; 2275 if (sp->myauth.proto != authproto) { 2276 /* not agreed, nak */ 2277 if (debug) 2278 addlog(" [mine %s != his %s]", 2279 sppp_proto_name(sp->myauth.proto), 2280 sppp_proto_name(authproto)); 2281 p[2] = sp->myauth.proto >> 8; 2282 p[3] = sp->myauth.proto; 2283 break; 2284 } 2285 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2286 if (debug) 2287 addlog(" [chap not MD5]"); 2288 p[4] = CHAP_MD5; 2289 break; 2290 } 2291 continue; 2292 } 2293 /* Add the option to nak'ed list. */ 2294 bcopy (p, r, p[1]); 2295 r += p[1]; 2296 rlen += p[1]; 2297 } 2298 if (rlen) { 2299 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2300 if (debug) 2301 addlog(" max_failure (%d) exceeded, " 2302 "send conf-rej\n", 2303 sp->lcp.max_failure); 2304 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2305 } else { 2306 if (debug) 2307 addlog(" send conf-nak\n"); 2308 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2309 } 2310 goto end; 2311 } else { 2312 if (debug) 2313 addlog(" send conf-ack\n"); 2314 sp->fail_counter[IDX_LCP] = 0; 2315 sp->pp_loopcnt = 0; 2316 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2317 } 2318 2319 end: 2320 free(buf, M_TEMP); 2321 return (rlen == 0); 2322 2323 drop: 2324 free(buf, M_TEMP); 2325 return -1; 2326 } 2327 2328 /* 2329 * Analyze the LCP Configure-Reject option list, and adjust our 2330 * negotiation. 2331 */ 2332 static void 2333 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2334 { 2335 STDDCL; 2336 u_char *buf, *p; 2337 2338 len -= 4; 2339 buf = malloc (len, M_TEMP, M_NOWAIT); 2340 if (!buf) 2341 return; 2342 2343 if (debug) 2344 log(LOG_DEBUG, "%s: lcp rej opts:", 2345 ifp->if_xname); 2346 2347 p = (void *)(h + 1); 2348 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2349 /* Sanity check option length */ 2350 if (p[1] > len) { 2351 /* 2352 * Malicious option - drop immediately. 2353 * XXX Maybe we should just RXJ it? 2354 */ 2355 addlog("%s: received malicious LCP option, " 2356 "dropping.\n", ifp->if_xname); 2357 goto drop; 2358 } 2359 if (debug) 2360 addlog(" %s", sppp_lcp_opt_name(*p)); 2361 switch (*p) { 2362 case LCP_OPT_MAGIC: 2363 /* Magic number -- can't use it, use 0 */ 2364 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2365 sp->lcp.magic = 0; 2366 break; 2367 case LCP_OPT_MRU: 2368 /* 2369 * We try to negotiate a lower MRU if the underlying 2370 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2371 * peer rejects this lower rate, fallback to the 2372 * default. 2373 */ 2374 if (debug) { 2375 addlog("%s: warning: peer rejected our MRU of " 2376 "%ld bytes. Defaulting to %d bytes\n", 2377 ifp->if_xname, sp->lcp.mru, PP_MTU); 2378 } 2379 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2380 sp->lcp.mru = PP_MTU; 2381 break; 2382 case LCP_OPT_AUTH_PROTO: 2383 /* 2384 * Peer doesn't want to authenticate himself, 2385 * deny unless this is a dialout call, and 2386 * SPPP_AUTHFLAG_NOCALLOUT is set. 2387 */ 2388 if ((sp->pp_flags & PP_CALLIN) == 0 && 2389 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2390 if (debug) 2391 addlog(" [don't insist on auth " 2392 "for callout]"); 2393 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2394 break; 2395 } 2396 if (debug) 2397 addlog("[access denied]\n"); 2398 lcp.Close(sp); 2399 break; 2400 } 2401 } 2402 if (debug) 2403 addlog("\n"); 2404 drop: 2405 free(buf, M_TEMP); 2406 return; 2407 } 2408 2409 /* 2410 * Analyze the LCP Configure-NAK option list, and adjust our 2411 * negotiation. 2412 */ 2413 static void 2414 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2415 { 2416 STDDCL; 2417 u_char *buf, *p; 2418 uint32_t magic; 2419 2420 len -= 4; 2421 buf = malloc (len, M_TEMP, M_NOWAIT); 2422 if (!buf) 2423 return; 2424 2425 if (debug) 2426 log(LOG_DEBUG, "%s: lcp nak opts:", 2427 ifp->if_xname); 2428 2429 p = (void *)(h + 1); 2430 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2431 /* Sanity check option length */ 2432 if (p[1] > len) { 2433 /* 2434 * Malicious option - drop immediately. 2435 * XXX Maybe we should just RXJ it? 2436 */ 2437 addlog("%s: received malicious LCP option, " 2438 "dropping.\n", ifp->if_xname); 2439 goto drop; 2440 } 2441 if (debug) 2442 addlog(" %s", sppp_lcp_opt_name(*p)); 2443 switch (*p) { 2444 case LCP_OPT_MAGIC: 2445 /* Magic number -- renegotiate */ 2446 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2447 len >= 6 && p[1] == 6) { 2448 magic = (uint32_t)p[2] << 24 | 2449 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2450 /* 2451 * If the remote magic is our negated one, 2452 * this looks like a loopback problem. 2453 * Suggest a new magic to make sure. 2454 */ 2455 if (magic == ~sp->lcp.magic) { 2456 if (debug) 2457 addlog(" magic glitch"); 2458 sp->lcp.magic = cprng_fast32(); 2459 } else { 2460 sp->lcp.magic = magic; 2461 if (debug) 2462 addlog(" %d", magic); 2463 } 2464 } 2465 break; 2466 case LCP_OPT_MRU: 2467 /* 2468 * Peer wants to advise us to negotiate an MRU. 2469 * Agree on it if it's reasonable, or use 2470 * default otherwise. 2471 */ 2472 if (len >= 4 && p[1] == 4) { 2473 u_int mru = p[2] * 256 + p[3]; 2474 if (debug) 2475 addlog(" %d", mru); 2476 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2477 mru = sp->pp_if.if_mtu; 2478 sp->lcp.mru = mru; 2479 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2480 } 2481 break; 2482 case LCP_OPT_AUTH_PROTO: 2483 /* 2484 * Peer doesn't like our authentication method, 2485 * deny. 2486 */ 2487 if (debug) 2488 addlog("[access denied]\n"); 2489 lcp.Close(sp); 2490 break; 2491 } 2492 } 2493 if (debug) 2494 addlog("\n"); 2495 drop: 2496 free(buf, M_TEMP); 2497 return; 2498 } 2499 2500 static void 2501 sppp_lcp_tlu(struct sppp *sp) 2502 { 2503 STDDCL; 2504 int i; 2505 uint32_t mask; 2506 2507 /* XXX ? */ 2508 if (! (ifp->if_flags & IFF_UP) && 2509 (ifp->if_flags & IFF_RUNNING)) { 2510 /* Coming out of loopback mode. */ 2511 if_up(ifp); 2512 } 2513 2514 for (i = 0; i < IDX_COUNT; i++) 2515 if ((cps[i])->flags & CP_QUAL) 2516 (cps[i])->Open(sp); 2517 2518 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2519 (sp->pp_flags & PP_NEEDAUTH) != 0) 2520 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2521 else 2522 sp->pp_phase = SPPP_PHASE_NETWORK; 2523 2524 if (debug) 2525 { 2526 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2527 sppp_phase_name(sp->pp_phase)); 2528 } 2529 2530 /* 2531 * Open all authentication protocols. This is even required 2532 * if we already proceeded to network phase, since it might be 2533 * that remote wants us to authenticate, so we might have to 2534 * send a PAP request. Undesired authentication protocols 2535 * don't do anything when they get an Open event. 2536 */ 2537 for (i = 0; i < IDX_COUNT; i++) 2538 if ((cps[i])->flags & CP_AUTH) 2539 (cps[i])->Open(sp); 2540 2541 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2542 /* Notify all NCPs. */ 2543 for (i = 0; i < IDX_COUNT; i++) 2544 if ((cps[i])->flags & CP_NCP) 2545 (cps[i])->Open(sp); 2546 } 2547 2548 /* Send Up events to all started protos. */ 2549 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2550 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2551 (cps[i])->Up(sp); 2552 2553 /* notify low-level driver of state change */ 2554 if (sp->pp_chg) 2555 sp->pp_chg(sp, (int)sp->pp_phase); 2556 2557 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2558 /* if no NCP is starting, close down */ 2559 sppp_lcp_check_and_close(sp); 2560 } 2561 2562 static void 2563 sppp_lcp_tld(struct sppp *sp) 2564 { 2565 STDDCL; 2566 int i; 2567 uint32_t mask; 2568 2569 sp->pp_phase = SPPP_PHASE_TERMINATE; 2570 2571 if (debug) 2572 { 2573 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2574 sppp_phase_name(sp->pp_phase)); 2575 } 2576 2577 /* 2578 * Take upper layers down. We send the Down event first and 2579 * the Close second to prevent the upper layers from sending 2580 * ``a flurry of terminate-request packets'', as the RFC 2581 * describes it. 2582 */ 2583 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2584 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2585 (cps[i])->Down(sp); 2586 (cps[i])->Close(sp); 2587 } 2588 } 2589 2590 static void 2591 sppp_lcp_tls(struct sppp *sp) 2592 { 2593 STDDCL; 2594 2595 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2596 printf("%s: authentication failed %d times, not retrying again\n", 2597 sp->pp_if.if_xname, sp->pp_auth_failures); 2598 if_down(&sp->pp_if); 2599 return; 2600 } 2601 2602 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2603 2604 if (debug) 2605 { 2606 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2607 sppp_phase_name(sp->pp_phase)); 2608 } 2609 2610 /* Notify lower layer if desired. */ 2611 if (sp->pp_tls) 2612 (sp->pp_tls)(sp); 2613 } 2614 2615 static void 2616 sppp_lcp_tlf(struct sppp *sp) 2617 { 2618 STDDCL; 2619 2620 sp->pp_phase = SPPP_PHASE_DEAD; 2621 2622 if (debug) 2623 { 2624 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2625 sppp_phase_name(sp->pp_phase)); 2626 } 2627 2628 /* Notify lower layer if desired. */ 2629 if (sp->pp_tlf) 2630 (sp->pp_tlf)(sp); 2631 } 2632 2633 static void 2634 sppp_lcp_scr(struct sppp *sp) 2635 { 2636 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2637 int i = 0; 2638 u_short authproto; 2639 2640 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2641 if (! sp->lcp.magic) 2642 sp->lcp.magic = cprng_fast32(); 2643 opt[i++] = LCP_OPT_MAGIC; 2644 opt[i++] = 6; 2645 opt[i++] = sp->lcp.magic >> 24; 2646 opt[i++] = sp->lcp.magic >> 16; 2647 opt[i++] = sp->lcp.magic >> 8; 2648 opt[i++] = sp->lcp.magic; 2649 } 2650 2651 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2652 opt[i++] = LCP_OPT_MRU; 2653 opt[i++] = 4; 2654 opt[i++] = sp->lcp.mru >> 8; 2655 opt[i++] = sp->lcp.mru; 2656 } 2657 2658 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2659 authproto = sp->hisauth.proto; 2660 opt[i++] = LCP_OPT_AUTH_PROTO; 2661 opt[i++] = authproto == PPP_CHAP? 5: 4; 2662 opt[i++] = authproto >> 8; 2663 opt[i++] = authproto; 2664 if (authproto == PPP_CHAP) 2665 opt[i++] = CHAP_MD5; 2666 } 2667 2668 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2669 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2670 } 2671 2672 /* 2673 * Check the open NCPs, return true if at least one NCP is open. 2674 */ 2675 static int 2676 sppp_ncp_check(struct sppp *sp) 2677 { 2678 int i, mask; 2679 2680 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2681 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2682 return 1; 2683 return 0; 2684 } 2685 2686 /* 2687 * Re-check the open NCPs and see if we should terminate the link. 2688 * Called by the NCPs during their tlf action handling. 2689 */ 2690 static void 2691 sppp_lcp_check_and_close(struct sppp *sp) 2692 { 2693 2694 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2695 /* don't bother, we are already going down */ 2696 return; 2697 2698 if (sppp_ncp_check(sp)) 2699 return; 2700 2701 lcp.Close(sp); 2702 } 2703 2704 2705 /* 2706 *--------------------------------------------------------------------------* 2707 * * 2708 * The IPCP implementation. * 2709 * * 2710 *--------------------------------------------------------------------------* 2711 */ 2712 2713 static void 2714 sppp_ipcp_init(struct sppp *sp) 2715 { 2716 sp->ipcp.opts = 0; 2717 sp->ipcp.flags = 0; 2718 sp->state[IDX_IPCP] = STATE_INITIAL; 2719 sp->fail_counter[IDX_IPCP] = 0; 2720 sp->pp_seq[IDX_IPCP] = 0; 2721 sp->pp_rseq[IDX_IPCP] = 0; 2722 callout_init(&sp->ch[IDX_IPCP], 0); 2723 } 2724 2725 static void 2726 sppp_ipcp_up(struct sppp *sp) 2727 { 2728 sppp_up_event(&ipcp, sp); 2729 } 2730 2731 static void 2732 sppp_ipcp_down(struct sppp *sp) 2733 { 2734 sppp_down_event(&ipcp, sp); 2735 } 2736 2737 static void 2738 sppp_ipcp_open(struct sppp *sp) 2739 { 2740 STDDCL; 2741 uint32_t myaddr, hisaddr; 2742 2743 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2744 sp->ipcp.req_myaddr = 0; 2745 sp->ipcp.req_hisaddr = 0; 2746 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2747 2748 #ifdef INET 2749 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2750 #else 2751 myaddr = hisaddr = 0; 2752 #endif 2753 /* 2754 * If we don't have his address, this probably means our 2755 * interface doesn't want to talk IP at all. (This could 2756 * be the case if somebody wants to speak only IPX, for 2757 * example.) Don't open IPCP in this case. 2758 */ 2759 if (hisaddr == 0) { 2760 /* XXX this message should go away */ 2761 if (debug) 2762 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2763 ifp->if_xname); 2764 return; 2765 } 2766 2767 if (myaddr == 0) { 2768 /* 2769 * I don't have an assigned address, so i need to 2770 * negotiate my address. 2771 */ 2772 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2773 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2774 } 2775 if (hisaddr == 1) { 2776 /* 2777 * XXX - remove this hack! 2778 * remote has no valid address, we need to get one assigned. 2779 */ 2780 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2781 } 2782 sppp_open_event(&ipcp, sp); 2783 } 2784 2785 static void 2786 sppp_ipcp_close(struct sppp *sp) 2787 { 2788 STDDCL; 2789 2790 sppp_close_event(&ipcp, sp); 2791 #ifdef INET 2792 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2793 /* 2794 * Some address was dynamic, clear it again. 2795 */ 2796 sppp_clear_ip_addrs(sp); 2797 #endif 2798 2799 if (sp->pp_saved_mtu > 0) { 2800 ifp->if_mtu = sp->pp_saved_mtu; 2801 sp->pp_saved_mtu = 0; 2802 if (debug) 2803 log(LOG_DEBUG, 2804 "%s: resetting MTU to %" PRIu64 " bytes\n", 2805 ifp->if_xname, ifp->if_mtu); 2806 } 2807 } 2808 2809 static void 2810 sppp_ipcp_TO(void *cookie) 2811 { 2812 sppp_to_event(&ipcp, (struct sppp *)cookie); 2813 } 2814 2815 /* 2816 * Analyze a configure request. Return true if it was agreeable, and 2817 * caused action sca, false if it has been rejected or nak'ed, and 2818 * caused action scn. (The return value is used to make the state 2819 * transition decision in the state automaton.) 2820 */ 2821 static int 2822 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2823 { 2824 u_char *buf, *r, *p; 2825 struct ifnet *ifp = &sp->pp_if; 2826 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2827 uint32_t hisaddr, desiredaddr; 2828 2829 len -= 4; 2830 origlen = len; 2831 /* 2832 * Make sure to allocate a buf that can at least hold a 2833 * conf-nak with an `address' option. We might need it below. 2834 */ 2835 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2836 if (! buf) 2837 return (0); 2838 2839 /* pass 1: see if we can recognize them */ 2840 if (debug) 2841 log(LOG_DEBUG, "%s: ipcp parse opts:", 2842 ifp->if_xname); 2843 p = (void *)(h + 1); 2844 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2845 /* Sanity check option length */ 2846 if (p[1] > len) { 2847 /* XXX should we just RXJ? */ 2848 addlog("%s: malicious IPCP option received, dropping\n", 2849 ifp->if_xname); 2850 goto drop; 2851 } 2852 if (debug) 2853 addlog(" %s", sppp_ipcp_opt_name(*p)); 2854 switch (*p) { 2855 #ifdef notyet 2856 case IPCP_OPT_COMPRESSION: 2857 if (len >= 6 && p[1] >= 6) { 2858 /* correctly formed compress option */ 2859 continue; 2860 } 2861 if (debug) 2862 addlog(" [invalid]"); 2863 break; 2864 #endif 2865 case IPCP_OPT_ADDRESS: 2866 if (len >= 6 && p[1] == 6) { 2867 /* correctly formed address option */ 2868 continue; 2869 } 2870 if (debug) 2871 addlog(" [invalid]"); 2872 break; 2873 default: 2874 /* Others not supported. */ 2875 if (debug) 2876 addlog(" [rej]"); 2877 break; 2878 } 2879 /* Add the option to rejected list. */ 2880 bcopy (p, r, p[1]); 2881 r += p[1]; 2882 rlen += p[1]; 2883 } 2884 if (rlen) { 2885 if (debug) 2886 addlog(" send conf-rej\n"); 2887 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2888 goto end; 2889 } else if (debug) 2890 addlog("\n"); 2891 2892 /* pass 2: parse option values */ 2893 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2894 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2895 else 2896 #ifdef INET 2897 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2898 #else 2899 hisaddr = 0; 2900 #endif 2901 if (debug) 2902 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2903 ifp->if_xname); 2904 p = (void *)(h + 1); 2905 len = origlen; 2906 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2907 if (debug) 2908 addlog(" %s", sppp_ipcp_opt_name(*p)); 2909 switch (*p) { 2910 #ifdef notyet 2911 case IPCP_OPT_COMPRESSION: 2912 continue; 2913 #endif 2914 case IPCP_OPT_ADDRESS: 2915 desiredaddr = p[2] << 24 | p[3] << 16 | 2916 p[4] << 8 | p[5]; 2917 if (desiredaddr == hisaddr || 2918 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2919 /* 2920 * Peer's address is same as our value, 2921 * this is agreeable. Gonna conf-ack 2922 * it. 2923 */ 2924 if (debug) 2925 addlog(" %s [ack]", 2926 sppp_dotted_quad(hisaddr)); 2927 /* record that we've seen it already */ 2928 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2929 sp->ipcp.req_hisaddr = desiredaddr; 2930 hisaddr = desiredaddr; 2931 continue; 2932 } 2933 /* 2934 * The address wasn't agreeable. This is either 2935 * he sent us 0.0.0.0, asking to assign him an 2936 * address, or he send us another address not 2937 * matching our value. Either case, we gonna 2938 * conf-nak it with our value. 2939 */ 2940 if (debug) { 2941 if (desiredaddr == 0) 2942 addlog(" [addr requested]"); 2943 else 2944 addlog(" %s [not agreed]", 2945 sppp_dotted_quad(desiredaddr)); 2946 } 2947 2948 p[2] = hisaddr >> 24; 2949 p[3] = hisaddr >> 16; 2950 p[4] = hisaddr >> 8; 2951 p[5] = hisaddr; 2952 break; 2953 } 2954 /* Add the option to nak'ed list. */ 2955 bcopy (p, r, p[1]); 2956 r += p[1]; 2957 rlen += p[1]; 2958 } 2959 2960 /* 2961 * If we are about to conf-ack the request, but haven't seen 2962 * his address so far, gonna conf-nak it instead, with the 2963 * `address' option present and our idea of his address being 2964 * filled in there, to request negotiation of both addresses. 2965 * 2966 * XXX This can result in an endless req - nak loop if peer 2967 * doesn't want to send us his address. Q: What should we do 2968 * about it? XXX A: implement the max-failure counter. 2969 */ 2970 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2971 buf[0] = IPCP_OPT_ADDRESS; 2972 buf[1] = 6; 2973 buf[2] = hisaddr >> 24; 2974 buf[3] = hisaddr >> 16; 2975 buf[4] = hisaddr >> 8; 2976 buf[5] = hisaddr; 2977 rlen = 6; 2978 if (debug) 2979 addlog(" still need hisaddr"); 2980 } 2981 2982 if (rlen) { 2983 if (debug) 2984 addlog(" send conf-nak\n"); 2985 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2986 } else { 2987 if (debug) 2988 addlog(" send conf-ack\n"); 2989 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2990 } 2991 2992 end: 2993 free(buf, M_TEMP); 2994 return (rlen == 0); 2995 2996 drop: 2997 free(buf, M_TEMP); 2998 return -1; 2999 } 3000 3001 /* 3002 * Analyze the IPCP Configure-Reject option list, and adjust our 3003 * negotiation. 3004 */ 3005 static void 3006 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3007 { 3008 u_char *buf, *p; 3009 struct ifnet *ifp = &sp->pp_if; 3010 int debug = ifp->if_flags & IFF_DEBUG; 3011 3012 len -= 4; 3013 buf = malloc (len, M_TEMP, M_NOWAIT); 3014 if (!buf) 3015 return; 3016 3017 if (debug) 3018 log(LOG_DEBUG, "%s: ipcp rej opts:", 3019 ifp->if_xname); 3020 3021 p = (void *)(h + 1); 3022 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3023 /* Sanity check option length */ 3024 if (p[1] > len) { 3025 /* XXX should we just RXJ? */ 3026 addlog("%s: malicious IPCP option received, dropping\n", 3027 ifp->if_xname); 3028 goto drop; 3029 } 3030 if (debug) 3031 addlog(" %s", sppp_ipcp_opt_name(*p)); 3032 switch (*p) { 3033 case IPCP_OPT_ADDRESS: 3034 /* 3035 * Peer doesn't grok address option. This is 3036 * bad. XXX Should we better give up here? 3037 */ 3038 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3039 break; 3040 #ifdef notyet 3041 case IPCP_OPT_COMPRESS: 3042 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3043 break; 3044 #endif 3045 } 3046 } 3047 if (debug) 3048 addlog("\n"); 3049 drop: 3050 free(buf, M_TEMP); 3051 return; 3052 } 3053 3054 /* 3055 * Analyze the IPCP Configure-NAK option list, and adjust our 3056 * negotiation. 3057 */ 3058 static void 3059 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3060 { 3061 u_char *p; 3062 struct ifnet *ifp = &sp->pp_if; 3063 int debug = ifp->if_flags & IFF_DEBUG; 3064 uint32_t wantaddr; 3065 3066 len -= 4; 3067 3068 if (debug) 3069 log(LOG_DEBUG, "%s: ipcp nak opts:", 3070 ifp->if_xname); 3071 3072 p = (void *)(h + 1); 3073 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3074 /* Sanity check option length */ 3075 if (p[1] > len) { 3076 /* XXX should we just RXJ? */ 3077 addlog("%s: malicious IPCP option received, dropping\n", 3078 ifp->if_xname); 3079 return; 3080 } 3081 if (debug) 3082 addlog(" %s", sppp_ipcp_opt_name(*p)); 3083 switch (*p) { 3084 case IPCP_OPT_ADDRESS: 3085 /* 3086 * Peer doesn't like our local IP address. See 3087 * if we can do something for him. We'll drop 3088 * him our address then. 3089 */ 3090 if (len >= 6 && p[1] == 6) { 3091 wantaddr = p[2] << 24 | p[3] << 16 | 3092 p[4] << 8 | p[5]; 3093 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3094 if (debug) 3095 addlog(" [wantaddr %s]", 3096 sppp_dotted_quad(wantaddr)); 3097 /* 3098 * When doing dynamic address assignment, 3099 * we accept his offer. Otherwise, we 3100 * ignore it and thus continue to negotiate 3101 * our already existing value. 3102 */ 3103 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3104 if (debug) 3105 addlog(" [agree]"); 3106 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3107 sp->ipcp.req_myaddr = wantaddr; 3108 } 3109 } 3110 break; 3111 3112 case IPCP_OPT_PRIMDNS: 3113 if (len >= 6 && p[1] == 6) { 3114 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3115 p[4] << 8 | p[5]; 3116 } 3117 break; 3118 3119 case IPCP_OPT_SECDNS: 3120 if (len >= 6 && p[1] == 6) { 3121 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3122 p[4] << 8 | p[5]; 3123 } 3124 break; 3125 #ifdef notyet 3126 case IPCP_OPT_COMPRESS: 3127 /* 3128 * Peer wants different compression parameters. 3129 */ 3130 break; 3131 #endif 3132 } 3133 } 3134 if (debug) 3135 addlog("\n"); 3136 } 3137 3138 static void 3139 sppp_ipcp_tlu(struct sppp *sp) 3140 { 3141 #ifdef INET 3142 /* we are up. Set addresses and notify anyone interested */ 3143 STDDCL; 3144 uint32_t myaddr, hisaddr; 3145 3146 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3147 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3148 myaddr = sp->ipcp.req_myaddr; 3149 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3150 hisaddr = sp->ipcp.req_hisaddr; 3151 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3152 3153 if (ifp->if_mtu > sp->lcp.their_mru) { 3154 sp->pp_saved_mtu = ifp->if_mtu; 3155 ifp->if_mtu = sp->lcp.their_mru; 3156 if (debug) 3157 log(LOG_DEBUG, 3158 "%s: setting MTU to %" PRIu64 " bytes\n", 3159 ifp->if_xname, ifp->if_mtu); 3160 } 3161 3162 if (sp->pp_con) 3163 sp->pp_con(sp); 3164 #endif 3165 } 3166 3167 static void 3168 sppp_ipcp_tld(struct sppp *sp) 3169 { 3170 } 3171 3172 static void 3173 sppp_ipcp_tls(struct sppp *sp) 3174 { 3175 /* indicate to LCP that it must stay alive */ 3176 sp->lcp.protos |= (1 << IDX_IPCP); 3177 } 3178 3179 static void 3180 sppp_ipcp_tlf(struct sppp *sp) 3181 { 3182 /* we no longer need LCP */ 3183 sp->lcp.protos &= ~(1 << IDX_IPCP); 3184 } 3185 3186 static void 3187 sppp_ipcp_scr(struct sppp *sp) 3188 { 3189 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3190 #ifdef INET 3191 uint32_t ouraddr; 3192 #endif 3193 int i = 0; 3194 3195 #ifdef notyet 3196 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3197 opt[i++] = IPCP_OPT_COMPRESSION; 3198 opt[i++] = 6; 3199 opt[i++] = 0; /* VJ header compression */ 3200 opt[i++] = 0x2d; /* VJ header compression */ 3201 opt[i++] = max_slot_id; 3202 opt[i++] = comp_slot_id; 3203 } 3204 #endif 3205 3206 #ifdef INET 3207 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3208 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3209 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3210 else 3211 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3212 opt[i++] = IPCP_OPT_ADDRESS; 3213 opt[i++] = 6; 3214 opt[i++] = ouraddr >> 24; 3215 opt[i++] = ouraddr >> 16; 3216 opt[i++] = ouraddr >> 8; 3217 opt[i++] = ouraddr; 3218 } 3219 #endif 3220 3221 if (sp->query_dns & 1) { 3222 opt[i++] = IPCP_OPT_PRIMDNS; 3223 opt[i++] = 6; 3224 opt[i++] = sp->dns_addrs[0] >> 24; 3225 opt[i++] = sp->dns_addrs[0] >> 16; 3226 opt[i++] = sp->dns_addrs[0] >> 8; 3227 opt[i++] = sp->dns_addrs[0]; 3228 } 3229 if (sp->query_dns & 2) { 3230 opt[i++] = IPCP_OPT_SECDNS; 3231 opt[i++] = 6; 3232 opt[i++] = sp->dns_addrs[1] >> 24; 3233 opt[i++] = sp->dns_addrs[1] >> 16; 3234 opt[i++] = sp->dns_addrs[1] >> 8; 3235 opt[i++] = sp->dns_addrs[1]; 3236 } 3237 3238 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3239 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3240 } 3241 3242 3243 /* 3244 *--------------------------------------------------------------------------* 3245 * * 3246 * The IPv6CP implementation. * 3247 * * 3248 *--------------------------------------------------------------------------* 3249 */ 3250 3251 #ifdef INET6 3252 static void 3253 sppp_ipv6cp_init(struct sppp *sp) 3254 { 3255 sp->ipv6cp.opts = 0; 3256 sp->ipv6cp.flags = 0; 3257 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3258 sp->fail_counter[IDX_IPV6CP] = 0; 3259 sp->pp_seq[IDX_IPV6CP] = 0; 3260 sp->pp_rseq[IDX_IPV6CP] = 0; 3261 callout_init(&sp->ch[IDX_IPV6CP], 0); 3262 } 3263 3264 static void 3265 sppp_ipv6cp_up(struct sppp *sp) 3266 { 3267 sppp_up_event(&ipv6cp, sp); 3268 } 3269 3270 static void 3271 sppp_ipv6cp_down(struct sppp *sp) 3272 { 3273 sppp_down_event(&ipv6cp, sp); 3274 } 3275 3276 static void 3277 sppp_ipv6cp_open(struct sppp *sp) 3278 { 3279 STDDCL; 3280 struct in6_addr myaddr, hisaddr; 3281 3282 #ifdef IPV6CP_MYIFID_DYN 3283 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3284 #else 3285 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3286 #endif 3287 3288 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3289 /* 3290 * If we don't have our address, this probably means our 3291 * interface doesn't want to talk IPv6 at all. (This could 3292 * be the case if somebody wants to speak only IPX, for 3293 * example.) Don't open IPv6CP in this case. 3294 */ 3295 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3296 /* XXX this message should go away */ 3297 if (debug) 3298 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3299 ifp->if_xname); 3300 return; 3301 } 3302 3303 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3304 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3305 sppp_open_event(&ipv6cp, sp); 3306 } 3307 3308 static void 3309 sppp_ipv6cp_close(struct sppp *sp) 3310 { 3311 sppp_close_event(&ipv6cp, sp); 3312 } 3313 3314 static void 3315 sppp_ipv6cp_TO(void *cookie) 3316 { 3317 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3318 } 3319 3320 /* 3321 * Analyze a configure request. Return true if it was agreeable, and 3322 * caused action sca, false if it has been rejected or nak'ed, and 3323 * caused action scn. (The return value is used to make the state 3324 * transition decision in the state automaton.) 3325 */ 3326 static int 3327 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3328 { 3329 u_char *buf, *r, *p; 3330 struct ifnet *ifp = &sp->pp_if; 3331 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3332 struct in6_addr myaddr, desiredaddr, suggestaddr; 3333 int ifidcount; 3334 int type; 3335 int collision, nohisaddr; 3336 3337 len -= 4; 3338 origlen = len; 3339 /* 3340 * Make sure to allocate a buf that can at least hold a 3341 * conf-nak with an `address' option. We might need it below. 3342 */ 3343 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3344 if (! buf) 3345 return (0); 3346 3347 /* pass 1: see if we can recognize them */ 3348 if (debug) 3349 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3350 ifp->if_xname); 3351 p = (void *)(h + 1); 3352 ifidcount = 0; 3353 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3354 /* Sanity check option length */ 3355 if (p[1] > len) { 3356 /* XXX just RXJ? */ 3357 addlog("%s: received malicious IPCPv6 option, " 3358 "dropping\n", ifp->if_xname); 3359 goto drop; 3360 } 3361 if (debug) 3362 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3363 switch (*p) { 3364 case IPV6CP_OPT_IFID: 3365 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3366 /* correctly formed address option */ 3367 ifidcount++; 3368 continue; 3369 } 3370 if (debug) 3371 addlog(" [invalid]"); 3372 break; 3373 #ifdef notyet 3374 case IPV6CP_OPT_COMPRESSION: 3375 if (len >= 4 && p[1] >= 4) { 3376 /* correctly formed compress option */ 3377 continue; 3378 } 3379 if (debug) 3380 addlog(" [invalid]"); 3381 break; 3382 #endif 3383 default: 3384 /* Others not supported. */ 3385 if (debug) 3386 addlog(" [rej]"); 3387 break; 3388 } 3389 /* Add the option to rejected list. */ 3390 bcopy (p, r, p[1]); 3391 r += p[1]; 3392 rlen += p[1]; 3393 } 3394 if (rlen) { 3395 if (debug) 3396 addlog(" send conf-rej\n"); 3397 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3398 goto end; 3399 } else if (debug) 3400 addlog("\n"); 3401 3402 /* pass 2: parse option values */ 3403 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3404 if (debug) 3405 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3406 ifp->if_xname); 3407 p = (void *)(h + 1); 3408 len = origlen; 3409 type = CONF_ACK; 3410 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3411 if (debug) 3412 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3413 switch (*p) { 3414 #ifdef notyet 3415 case IPV6CP_OPT_COMPRESSION: 3416 continue; 3417 #endif 3418 case IPV6CP_OPT_IFID: 3419 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3420 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3421 collision = (memcmp(&desiredaddr.s6_addr[8], 3422 &myaddr.s6_addr[8], 8) == 0); 3423 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3424 3425 desiredaddr.s6_addr16[0] = htons(0xfe80); 3426 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3427 3428 if (!collision && !nohisaddr) { 3429 /* no collision, hisaddr known - Conf-Ack */ 3430 type = CONF_ACK; 3431 3432 if (debug) { 3433 addlog(" %s [%s]", 3434 ip6_sprintf(&desiredaddr), 3435 sppp_cp_type_name(type)); 3436 } 3437 continue; 3438 } 3439 3440 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3441 if (collision && nohisaddr) { 3442 /* collision, hisaddr unknown - Conf-Rej */ 3443 type = CONF_REJ; 3444 memset(&p[2], 0, 8); 3445 } else { 3446 /* 3447 * - no collision, hisaddr unknown, or 3448 * - collision, hisaddr known 3449 * Conf-Nak, suggest hisaddr 3450 */ 3451 type = CONF_NAK; 3452 sppp_suggest_ip6_addr(sp, &suggestaddr); 3453 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3454 } 3455 if (debug) 3456 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3457 sppp_cp_type_name(type)); 3458 break; 3459 } 3460 /* Add the option to nak'ed list. */ 3461 bcopy (p, r, p[1]); 3462 r += p[1]; 3463 rlen += p[1]; 3464 } 3465 3466 if (rlen == 0 && type == CONF_ACK) { 3467 if (debug) 3468 addlog(" send %s\n", sppp_cp_type_name(type)); 3469 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3470 } else { 3471 #ifdef notdef 3472 if (type == CONF_ACK) 3473 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3474 #endif 3475 3476 if (debug) { 3477 addlog(" send %s suggest %s\n", 3478 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3479 } 3480 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3481 } 3482 3483 end: 3484 free(buf, M_TEMP); 3485 return (rlen == 0); 3486 3487 drop: 3488 free(buf, M_TEMP); 3489 return -1; 3490 } 3491 3492 /* 3493 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3494 * negotiation. 3495 */ 3496 static void 3497 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3498 { 3499 u_char *buf, *p; 3500 struct ifnet *ifp = &sp->pp_if; 3501 int debug = ifp->if_flags & IFF_DEBUG; 3502 3503 len -= 4; 3504 buf = malloc (len, M_TEMP, M_NOWAIT); 3505 if (!buf) 3506 return; 3507 3508 if (debug) 3509 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3510 ifp->if_xname); 3511 3512 p = (void *)(h + 1); 3513 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3514 if (p[1] > len) { 3515 /* XXX just RXJ? */ 3516 addlog("%s: received malicious IPCPv6 option, " 3517 "dropping\n", ifp->if_xname); 3518 goto drop; 3519 } 3520 if (debug) 3521 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3522 switch (*p) { 3523 case IPV6CP_OPT_IFID: 3524 /* 3525 * Peer doesn't grok address option. This is 3526 * bad. XXX Should we better give up here? 3527 */ 3528 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3529 break; 3530 #ifdef notyet 3531 case IPV6CP_OPT_COMPRESS: 3532 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3533 break; 3534 #endif 3535 } 3536 } 3537 if (debug) 3538 addlog("\n"); 3539 drop: 3540 free(buf, M_TEMP); 3541 return; 3542 } 3543 3544 /* 3545 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3546 * negotiation. 3547 */ 3548 static void 3549 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3550 { 3551 u_char *buf, *p; 3552 struct ifnet *ifp = &sp->pp_if; 3553 int debug = ifp->if_flags & IFF_DEBUG; 3554 struct in6_addr suggestaddr; 3555 3556 len -= 4; 3557 buf = malloc (len, M_TEMP, M_NOWAIT); 3558 if (!buf) 3559 return; 3560 3561 if (debug) 3562 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3563 ifp->if_xname); 3564 3565 p = (void *)(h + 1); 3566 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3567 if (p[1] > len) { 3568 /* XXX just RXJ? */ 3569 addlog("%s: received malicious IPCPv6 option, " 3570 "dropping\n", ifp->if_xname); 3571 goto drop; 3572 } 3573 if (debug) 3574 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3575 switch (*p) { 3576 case IPV6CP_OPT_IFID: 3577 /* 3578 * Peer doesn't like our local ifid. See 3579 * if we can do something for him. We'll drop 3580 * him our address then. 3581 */ 3582 if (len < 10 || p[1] != 10) 3583 break; 3584 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3585 suggestaddr.s6_addr16[0] = htons(0xfe80); 3586 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3587 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3588 3589 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3590 if (debug) 3591 addlog(" [suggestaddr %s]", 3592 ip6_sprintf(&suggestaddr)); 3593 #ifdef IPV6CP_MYIFID_DYN 3594 /* 3595 * When doing dynamic address assignment, 3596 * we accept his offer. 3597 */ 3598 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3599 struct in6_addr lastsuggest; 3600 /* 3601 * If <suggested myaddr from peer> equals to 3602 * <hisaddr we have suggested last time>, 3603 * we have a collision. generate new random 3604 * ifid. 3605 */ 3606 sppp_suggest_ip6_addr(&lastsuggest); 3607 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3608 lastsuggest)) { 3609 if (debug) 3610 addlog(" [random]"); 3611 sppp_gen_ip6_addr(sp, &suggestaddr); 3612 } 3613 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3614 if (debug) 3615 addlog(" [agree]"); 3616 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3617 } 3618 #else 3619 /* 3620 * Since we do not do dynamic address assignment, 3621 * we ignore it and thus continue to negotiate 3622 * our already existing value. This can possibly 3623 * go into infinite request-reject loop. 3624 * 3625 * This is not likely because we normally use 3626 * ifid based on MAC-address. 3627 * If you have no ethernet card on the node, too bad. 3628 * XXX should we use fail_counter? 3629 */ 3630 #endif 3631 break; 3632 #ifdef notyet 3633 case IPV6CP_OPT_COMPRESS: 3634 /* 3635 * Peer wants different compression parameters. 3636 */ 3637 break; 3638 #endif 3639 } 3640 } 3641 if (debug) 3642 addlog("\n"); 3643 drop: 3644 free(buf, M_TEMP); 3645 return; 3646 } 3647 3648 static void 3649 sppp_ipv6cp_tlu(struct sppp *sp) 3650 { 3651 /* we are up - notify isdn daemon */ 3652 if (sp->pp_con) 3653 sp->pp_con(sp); 3654 } 3655 3656 static void 3657 sppp_ipv6cp_tld(struct sppp *sp) 3658 { 3659 } 3660 3661 static void 3662 sppp_ipv6cp_tls(struct sppp *sp) 3663 { 3664 /* indicate to LCP that it must stay alive */ 3665 sp->lcp.protos |= (1 << IDX_IPV6CP); 3666 } 3667 3668 static void 3669 sppp_ipv6cp_tlf(struct sppp *sp) 3670 { 3671 /* we no longer need LCP */ 3672 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3673 } 3674 3675 static void 3676 sppp_ipv6cp_scr(struct sppp *sp) 3677 { 3678 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3679 struct in6_addr ouraddr; 3680 int i = 0; 3681 3682 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3683 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3684 opt[i++] = IPV6CP_OPT_IFID; 3685 opt[i++] = 10; 3686 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3687 i += 8; 3688 } 3689 3690 #ifdef notyet 3691 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3692 opt[i++] = IPV6CP_OPT_COMPRESSION; 3693 opt[i++] = 4; 3694 opt[i++] = 0; /* TBD */ 3695 opt[i++] = 0; /* TBD */ 3696 /* variable length data may follow */ 3697 } 3698 #endif 3699 3700 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3701 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3702 } 3703 #else /*INET6*/ 3704 static void 3705 sppp_ipv6cp_init(struct sppp *sp) 3706 { 3707 } 3708 3709 static void 3710 sppp_ipv6cp_up(struct sppp *sp) 3711 { 3712 } 3713 3714 static void 3715 sppp_ipv6cp_down(struct sppp *sp) 3716 { 3717 } 3718 3719 static void 3720 sppp_ipv6cp_open(struct sppp *sp) 3721 { 3722 } 3723 3724 static void 3725 sppp_ipv6cp_close(struct sppp *sp) 3726 { 3727 } 3728 3729 static void 3730 sppp_ipv6cp_TO(void *sp) 3731 { 3732 } 3733 3734 static int 3735 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3736 int len) 3737 { 3738 return 0; 3739 } 3740 3741 static void 3742 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3743 int len) 3744 { 3745 } 3746 3747 static void 3748 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3749 int len) 3750 { 3751 } 3752 3753 static void 3754 sppp_ipv6cp_tlu(struct sppp *sp) 3755 { 3756 } 3757 3758 static void 3759 sppp_ipv6cp_tld(struct sppp *sp) 3760 { 3761 } 3762 3763 static void 3764 sppp_ipv6cp_tls(struct sppp *sp) 3765 { 3766 } 3767 3768 static void 3769 sppp_ipv6cp_tlf(struct sppp *sp) 3770 { 3771 } 3772 3773 static void 3774 sppp_ipv6cp_scr(struct sppp *sp) 3775 { 3776 } 3777 #endif /*INET6*/ 3778 3779 3780 /* 3781 *--------------------------------------------------------------------------* 3782 * * 3783 * The CHAP implementation. * 3784 * * 3785 *--------------------------------------------------------------------------* 3786 */ 3787 3788 /* 3789 * The authentication protocols don't employ a full-fledged state machine as 3790 * the control protocols do, since they do have Open and Close events, but 3791 * not Up and Down, nor are they explicitly terminated. Also, use of the 3792 * authentication protocols may be different in both directions (this makes 3793 * sense, think of a machine that never accepts incoming calls but only 3794 * calls out, it doesn't require the called party to authenticate itself). 3795 * 3796 * Our state machine for the local authentication protocol (we are requesting 3797 * the peer to authenticate) looks like: 3798 * 3799 * RCA- 3800 * +--------------------------------------------+ 3801 * V scn,tld| 3802 * +--------+ Close +---------+ RCA+ 3803 * | |<----------------------------------| |------+ 3804 * +--->| Closed | TO* | Opened | sca | 3805 * | | |-----+ +-------| |<-----+ 3806 * | +--------+ irc | | +---------+ 3807 * | ^ | | ^ 3808 * | | | | | 3809 * | | | | | 3810 * | TO-| | | | 3811 * | |tld TO+ V | | 3812 * | | +------->+ | | 3813 * | | | | | | 3814 * | +--------+ V | | 3815 * | | |<----+<--------------------+ | 3816 * | | Req- | scr | 3817 * | | Sent | | 3818 * | | | | 3819 * | +--------+ | 3820 * | RCA- | | RCA+ | 3821 * +------+ +------------------------------------------+ 3822 * scn,tld sca,irc,ict,tlu 3823 * 3824 * 3825 * with: 3826 * 3827 * Open: LCP reached authentication phase 3828 * Close: LCP reached terminate phase 3829 * 3830 * RCA+: received reply (pap-req, chap-response), acceptable 3831 * RCN: received reply (pap-req, chap-response), not acceptable 3832 * TO+: timeout with restart counter >= 0 3833 * TO-: timeout with restart counter < 0 3834 * TO*: reschedule timeout for CHAP 3835 * 3836 * scr: send request packet (none for PAP, chap-challenge) 3837 * sca: send ack packet (pap-ack, chap-success) 3838 * scn: send nak packet (pap-nak, chap-failure) 3839 * ict: initialize re-challenge timer (CHAP only) 3840 * 3841 * tlu: this-layer-up, LCP reaches network phase 3842 * tld: this-layer-down, LCP enters terminate phase 3843 * 3844 * Note that in CHAP mode, after sending a new challenge, while the state 3845 * automaton falls back into Req-Sent state, it doesn't signal a tld 3846 * event to LCP, so LCP remains in network phase. Only after not getting 3847 * any response (or after getting an unacceptable response), CHAP closes, 3848 * causing LCP to enter terminate phase. 3849 * 3850 * With PAP, there is no initial request that can be sent. The peer is 3851 * expected to send one based on the successful negotiation of PAP as 3852 * the authentication protocol during the LCP option negotiation. 3853 * 3854 * Incoming authentication protocol requests (remote requests 3855 * authentication, we are peer) don't employ a state machine at all, 3856 * they are simply answered. Some peers [Ascend P50 firmware rev 3857 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3858 * still in authentication phase (thereby violating the standard that 3859 * demands that these NCP packets are to be discarded), so we keep 3860 * track of the peer demanding us to authenticate, and only proceed to 3861 * phase network once we've seen a positive acknowledge for the 3862 * authentication. 3863 */ 3864 3865 /* 3866 * Handle incoming CHAP packets. 3867 */ 3868 void 3869 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3870 { 3871 STDDCL; 3872 struct lcp_header *h; 3873 int len, x; 3874 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3875 int value_len, name_len; 3876 MD5_CTX ctx; 3877 3878 len = m->m_pkthdr.len; 3879 if (len < 4) { 3880 if (debug) 3881 log(LOG_DEBUG, 3882 "%s: chap invalid packet length: %d bytes\n", 3883 ifp->if_xname, len); 3884 return; 3885 } 3886 h = mtod(m, struct lcp_header *); 3887 if (len > ntohs(h->len)) 3888 len = ntohs(h->len); 3889 3890 switch (h->type) { 3891 /* challenge, failure and success are his authproto */ 3892 case CHAP_CHALLENGE: 3893 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3894 /* can't do anything useful */ 3895 sp->pp_auth_failures++; 3896 printf("%s: chap input without my name and my secret being set\n", 3897 ifp->if_xname); 3898 break; 3899 } 3900 value = 1 + (u_char *)(h + 1); 3901 value_len = value[-1]; 3902 name = value + value_len; 3903 name_len = len - value_len - 5; 3904 if (name_len < 0) { 3905 if (debug) { 3906 log(LOG_DEBUG, 3907 "%s: chap corrupted challenge " 3908 "<%s id=0x%x len=%d", 3909 ifp->if_xname, 3910 sppp_auth_type_name(PPP_CHAP, h->type), 3911 h->ident, ntohs(h->len)); 3912 if (len > 4) 3913 sppp_print_bytes((u_char *)(h + 1), 3914 len - 4); 3915 addlog(">\n"); 3916 } 3917 break; 3918 } 3919 3920 if (debug) { 3921 log(LOG_DEBUG, 3922 "%s: chap input <%s id=0x%x len=%d name=", 3923 ifp->if_xname, 3924 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3925 ntohs(h->len)); 3926 sppp_print_string((char *) name, name_len); 3927 addlog(" value-size=%d value=", value_len); 3928 sppp_print_bytes(value, value_len); 3929 addlog(">\n"); 3930 } 3931 3932 /* Compute reply value. */ 3933 MD5Init(&ctx); 3934 MD5Update(&ctx, &h->ident, 1); 3935 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3936 MD5Update(&ctx, value, value_len); 3937 MD5Final(digest, &ctx); 3938 dsize = sizeof digest; 3939 3940 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3941 sizeof dsize, (const char *)&dsize, 3942 sizeof digest, digest, 3943 sp->myauth.name_len, 3944 sp->myauth.name, 3945 0); 3946 break; 3947 3948 case CHAP_SUCCESS: 3949 if (debug) { 3950 log(LOG_DEBUG, "%s: chap success", 3951 ifp->if_xname); 3952 if (len > 4) { 3953 addlog(": "); 3954 sppp_print_string((char *)(h + 1), len - 4); 3955 } 3956 addlog("\n"); 3957 } 3958 x = splnet(); 3959 sp->pp_auth_failures = 0; 3960 sp->pp_flags &= ~PP_NEEDAUTH; 3961 if (sp->myauth.proto == PPP_CHAP && 3962 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3963 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3964 /* 3965 * We are authenticator for CHAP but didn't 3966 * complete yet. Leave it to tlu to proceed 3967 * to network phase. 3968 */ 3969 splx(x); 3970 break; 3971 } 3972 splx(x); 3973 sppp_phase_network(sp); 3974 break; 3975 3976 case CHAP_FAILURE: 3977 x = splnet(); 3978 sp->pp_auth_failures++; 3979 splx(x); 3980 if (debug) { 3981 log(LOG_INFO, "%s: chap failure", 3982 ifp->if_xname); 3983 if (len > 4) { 3984 addlog(": "); 3985 sppp_print_string((char *)(h + 1), len - 4); 3986 } 3987 addlog("\n"); 3988 } else 3989 log(LOG_INFO, "%s: chap failure\n", 3990 ifp->if_xname); 3991 /* await LCP shutdown by authenticator */ 3992 break; 3993 3994 /* response is my authproto */ 3995 case CHAP_RESPONSE: 3996 if (sp->hisauth.secret == NULL) { 3997 /* can't do anything useful */ 3998 printf("%s: chap input without his secret being set\n", 3999 ifp->if_xname); 4000 break; 4001 } 4002 value = 1 + (u_char *)(h + 1); 4003 value_len = value[-1]; 4004 name = value + value_len; 4005 name_len = len - value_len - 5; 4006 if (name_len < 0) { 4007 if (debug) { 4008 log(LOG_DEBUG, 4009 "%s: chap corrupted response " 4010 "<%s id=0x%x len=%d", 4011 ifp->if_xname, 4012 sppp_auth_type_name(PPP_CHAP, h->type), 4013 h->ident, ntohs(h->len)); 4014 if (len > 4) 4015 sppp_print_bytes((u_char *)(h + 1), 4016 len - 4); 4017 addlog(">\n"); 4018 } 4019 break; 4020 } 4021 if (h->ident != sp->confid[IDX_CHAP]) { 4022 if (debug) 4023 log(LOG_DEBUG, 4024 "%s: chap dropping response for old ID " 4025 "(got %d, expected %d)\n", 4026 ifp->if_xname, 4027 h->ident, sp->confid[IDX_CHAP]); 4028 break; 4029 } 4030 if (sp->hisauth.name != NULL && 4031 (name_len != sp->hisauth.name_len 4032 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4033 log(LOG_INFO, "%s: chap response, his name ", 4034 ifp->if_xname); 4035 sppp_print_string(name, name_len); 4036 addlog(" != expected "); 4037 sppp_print_string(sp->hisauth.name, 4038 sp->hisauth.name_len); 4039 addlog("\n"); 4040 goto chap_failure; 4041 } 4042 if (debug) { 4043 log(LOG_DEBUG, "%s: chap input(%s) " 4044 "<%s id=0x%x len=%d name=", 4045 ifp->if_xname, 4046 sppp_state_name(sp->state[IDX_CHAP]), 4047 sppp_auth_type_name(PPP_CHAP, h->type), 4048 h->ident, ntohs(h->len)); 4049 sppp_print_string((char *)name, name_len); 4050 addlog(" value-size=%d value=", value_len); 4051 sppp_print_bytes(value, value_len); 4052 addlog(">\n"); 4053 } 4054 if (value_len != sizeof(sp->myauth.challenge)) { 4055 if (debug) 4056 log(LOG_DEBUG, 4057 "%s: chap bad hash value length: " 4058 "%d bytes, should be %ld\n", 4059 ifp->if_xname, value_len, 4060 (long) sizeof(sp->myauth.challenge)); 4061 goto chap_failure; 4062 } 4063 4064 MD5Init(&ctx); 4065 MD5Update(&ctx, &h->ident, 1); 4066 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4067 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4068 MD5Final(digest, &ctx); 4069 4070 #define FAILMSG "Failed..." 4071 #define SUCCMSG "Welcome!" 4072 4073 if (value_len != sizeof digest || 4074 memcmp(digest, value, value_len) != 0) { 4075 chap_failure: 4076 /* action scn, tld */ 4077 x = splnet(); 4078 sp->pp_auth_failures++; 4079 splx(x); 4080 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4081 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4082 0); 4083 chap.tld(sp); 4084 break; 4085 } 4086 sp->pp_auth_failures = 0; 4087 /* action sca, perhaps tlu */ 4088 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4089 sp->state[IDX_CHAP] == STATE_OPENED) 4090 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4091 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4092 0); 4093 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4094 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4095 chap.tlu(sp); 4096 } 4097 break; 4098 4099 default: 4100 /* Unknown CHAP packet type -- ignore. */ 4101 if (debug) { 4102 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4103 "<0x%x id=0x%xh len=%d", 4104 ifp->if_xname, 4105 sppp_state_name(sp->state[IDX_CHAP]), 4106 h->type, h->ident, ntohs(h->len)); 4107 if (len > 4) 4108 sppp_print_bytes((u_char *)(h + 1), len - 4); 4109 addlog(">\n"); 4110 } 4111 break; 4112 4113 } 4114 } 4115 4116 static void 4117 sppp_chap_init(struct sppp *sp) 4118 { 4119 /* Chap doesn't have STATE_INITIAL at all. */ 4120 sp->state[IDX_CHAP] = STATE_CLOSED; 4121 sp->fail_counter[IDX_CHAP] = 0; 4122 sp->pp_seq[IDX_CHAP] = 0; 4123 sp->pp_rseq[IDX_CHAP] = 0; 4124 callout_init(&sp->ch[IDX_CHAP], 0); 4125 } 4126 4127 static void 4128 sppp_chap_open(struct sppp *sp) 4129 { 4130 if (sp->myauth.proto == PPP_CHAP && 4131 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4132 /* we are authenticator for CHAP, start it */ 4133 chap.scr(sp); 4134 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4135 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4136 } 4137 /* nothing to be done if we are peer, await a challenge */ 4138 } 4139 4140 static void 4141 sppp_chap_close(struct sppp *sp) 4142 { 4143 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4144 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4145 } 4146 4147 static void 4148 sppp_chap_TO(void *cookie) 4149 { 4150 struct sppp *sp = (struct sppp *)cookie; 4151 STDDCL; 4152 int s; 4153 4154 s = splnet(); 4155 if (debug) 4156 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4157 ifp->if_xname, 4158 sppp_state_name(sp->state[IDX_CHAP]), 4159 sp->rst_counter[IDX_CHAP]); 4160 4161 if (--sp->rst_counter[IDX_CHAP] < 0) 4162 /* TO- event */ 4163 switch (sp->state[IDX_CHAP]) { 4164 case STATE_REQ_SENT: 4165 chap.tld(sp); 4166 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4167 break; 4168 } 4169 else 4170 /* TO+ (or TO*) event */ 4171 switch (sp->state[IDX_CHAP]) { 4172 case STATE_OPENED: 4173 /* TO* event */ 4174 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4175 /* fall through */ 4176 case STATE_REQ_SENT: 4177 chap.scr(sp); 4178 /* sppp_cp_change_state() will restart the timer */ 4179 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4180 break; 4181 } 4182 4183 splx(s); 4184 } 4185 4186 static void 4187 sppp_chap_tlu(struct sppp *sp) 4188 { 4189 STDDCL; 4190 int i, x; 4191 4192 i = 0; 4193 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4194 4195 /* 4196 * Some broken CHAP implementations (Conware CoNet, firmware 4197 * 4.0.?) don't want to re-authenticate their CHAP once the 4198 * initial challenge-response exchange has taken place. 4199 * Provide for an option to avoid rechallenges. 4200 */ 4201 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4202 /* 4203 * Compute the re-challenge timeout. This will yield 4204 * a number between 300 and 810 seconds. 4205 */ 4206 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4207 4208 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4209 } 4210 4211 if (debug) { 4212 log(LOG_DEBUG, 4213 "%s: chap %s, ", 4214 ifp->if_xname, 4215 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4216 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4217 addlog("next re-challenge in %d seconds\n", i); 4218 else 4219 addlog("re-challenging supressed\n"); 4220 } 4221 4222 x = splnet(); 4223 sp->pp_auth_failures = 0; 4224 /* indicate to LCP that we need to be closed down */ 4225 sp->lcp.protos |= (1 << IDX_CHAP); 4226 4227 if (sp->pp_flags & PP_NEEDAUTH) { 4228 /* 4229 * Remote is authenticator, but his auth proto didn't 4230 * complete yet. Defer the transition to network 4231 * phase. 4232 */ 4233 splx(x); 4234 return; 4235 } 4236 splx(x); 4237 4238 /* 4239 * If we are already in phase network, we are done here. This 4240 * is the case if this is a dummy tlu event after a re-challenge. 4241 */ 4242 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4243 sppp_phase_network(sp); 4244 } 4245 4246 static void 4247 sppp_chap_tld(struct sppp *sp) 4248 { 4249 STDDCL; 4250 4251 if (debug) 4252 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4253 callout_stop(&sp->ch[IDX_CHAP]); 4254 sp->lcp.protos &= ~(1 << IDX_CHAP); 4255 4256 lcp.Close(sp); 4257 } 4258 4259 static void 4260 sppp_chap_scr(struct sppp *sp) 4261 { 4262 uint32_t *ch; 4263 u_char clen = 4 * sizeof(uint32_t); 4264 4265 if (sp->myauth.name == NULL) { 4266 /* can't do anything useful */ 4267 printf("%s: chap starting without my name being set\n", 4268 sp->pp_if.if_xname); 4269 return; 4270 } 4271 4272 /* Compute random challenge. */ 4273 ch = (uint32_t *)sp->myauth.challenge; 4274 cprng_strong(kern_cprng, ch, clen, 0); 4275 4276 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4277 4278 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4279 sizeof clen, (const char *)&clen, 4280 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4281 sp->myauth.name_len, 4282 sp->myauth.name, 4283 0); 4284 } 4285 4286 /* 4287 *--------------------------------------------------------------------------* 4288 * * 4289 * The PAP implementation. * 4290 * * 4291 *--------------------------------------------------------------------------* 4292 */ 4293 /* 4294 * For PAP, we need to keep a little state also if we are the peer, not the 4295 * authenticator. This is since we don't get a request to authenticate, but 4296 * have to repeatedly authenticate ourself until we got a response (or the 4297 * retry counter is expired). 4298 */ 4299 4300 /* 4301 * Handle incoming PAP packets. */ 4302 static void 4303 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4304 { 4305 STDDCL; 4306 struct lcp_header *h; 4307 int len, x; 4308 u_char mlen; 4309 char *name, *secret; 4310 int name_len, secret_len; 4311 4312 /* 4313 * Malicious input might leave this uninitialized, so 4314 * init to an impossible value. 4315 */ 4316 secret_len = -1; 4317 4318 len = m->m_pkthdr.len; 4319 if (len < 5) { 4320 if (debug) 4321 log(LOG_DEBUG, 4322 "%s: pap invalid packet length: %d bytes\n", 4323 ifp->if_xname, len); 4324 return; 4325 } 4326 h = mtod(m, struct lcp_header *); 4327 if (len > ntohs(h->len)) 4328 len = ntohs(h->len); 4329 switch (h->type) { 4330 /* PAP request is my authproto */ 4331 case PAP_REQ: 4332 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4333 /* can't do anything useful */ 4334 printf("%s: pap request without his name and his secret being set\n", 4335 ifp->if_xname); 4336 break; 4337 } 4338 name = 1 + (u_char *)(h + 1); 4339 name_len = name[-1]; 4340 secret = name + name_len + 1; 4341 if (name_len > len - 6 || 4342 (secret_len = secret[-1]) > len - 6 - name_len) { 4343 if (debug) { 4344 log(LOG_DEBUG, "%s: pap corrupted input " 4345 "<%s id=0x%x len=%d", 4346 ifp->if_xname, 4347 sppp_auth_type_name(PPP_PAP, h->type), 4348 h->ident, ntohs(h->len)); 4349 if (len > 4) 4350 sppp_print_bytes((u_char *)(h + 1), 4351 len - 4); 4352 addlog(">\n"); 4353 } 4354 break; 4355 } 4356 if (debug) { 4357 log(LOG_DEBUG, "%s: pap input(%s) " 4358 "<%s id=0x%x len=%d name=", 4359 ifp->if_xname, 4360 sppp_state_name(sp->state[IDX_PAP]), 4361 sppp_auth_type_name(PPP_PAP, h->type), 4362 h->ident, ntohs(h->len)); 4363 sppp_print_string((char *)name, name_len); 4364 addlog(" secret="); 4365 sppp_print_string((char *)secret, secret_len); 4366 addlog(">\n"); 4367 } 4368 if (name_len != sp->hisauth.name_len || 4369 secret_len != sp->hisauth.secret_len || 4370 memcmp(name, sp->hisauth.name, name_len) != 0 || 4371 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4372 /* action scn, tld */ 4373 sp->pp_auth_failures++; 4374 mlen = sizeof(FAILMSG) - 1; 4375 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4376 sizeof mlen, (const char *)&mlen, 4377 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4378 0); 4379 pap.tld(sp); 4380 break; 4381 } 4382 /* action sca, perhaps tlu */ 4383 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4384 sp->state[IDX_PAP] == STATE_OPENED) { 4385 mlen = sizeof(SUCCMSG) - 1; 4386 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4387 sizeof mlen, (const char *)&mlen, 4388 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4389 0); 4390 } 4391 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4392 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4393 pap.tlu(sp); 4394 } 4395 break; 4396 4397 /* ack and nak are his authproto */ 4398 case PAP_ACK: 4399 callout_stop(&sp->pap_my_to_ch); 4400 if (debug) { 4401 log(LOG_DEBUG, "%s: pap success", 4402 ifp->if_xname); 4403 name = 1 + (u_char *)(h + 1); 4404 name_len = name[-1]; 4405 if (len > 5 && name_len < len+4) { 4406 addlog(": "); 4407 sppp_print_string(name, name_len); 4408 } 4409 addlog("\n"); 4410 } 4411 x = splnet(); 4412 sp->pp_auth_failures = 0; 4413 sp->pp_flags &= ~PP_NEEDAUTH; 4414 if (sp->myauth.proto == PPP_PAP && 4415 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4416 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4417 /* 4418 * We are authenticator for PAP but didn't 4419 * complete yet. Leave it to tlu to proceed 4420 * to network phase. 4421 */ 4422 splx(x); 4423 break; 4424 } 4425 splx(x); 4426 sppp_phase_network(sp); 4427 break; 4428 4429 case PAP_NAK: 4430 callout_stop(&sp->pap_my_to_ch); 4431 sp->pp_auth_failures++; 4432 if (debug) { 4433 log(LOG_INFO, "%s: pap failure", 4434 ifp->if_xname); 4435 name = 1 + (u_char *)(h + 1); 4436 name_len = name[-1]; 4437 if (len > 5 && name_len < len+4) { 4438 addlog(": "); 4439 sppp_print_string(name, name_len); 4440 } 4441 addlog("\n"); 4442 } else 4443 log(LOG_INFO, "%s: pap failure\n", 4444 ifp->if_xname); 4445 /* await LCP shutdown by authenticator */ 4446 break; 4447 4448 default: 4449 /* Unknown PAP packet type -- ignore. */ 4450 if (debug) { 4451 log(LOG_DEBUG, "%s: pap corrupted input " 4452 "<0x%x id=0x%x len=%d", 4453 ifp->if_xname, 4454 h->type, h->ident, ntohs(h->len)); 4455 if (len > 4) 4456 sppp_print_bytes((u_char *)(h + 1), len - 4); 4457 addlog(">\n"); 4458 } 4459 break; 4460 4461 } 4462 } 4463 4464 static void 4465 sppp_pap_init(struct sppp *sp) 4466 { 4467 /* PAP doesn't have STATE_INITIAL at all. */ 4468 sp->state[IDX_PAP] = STATE_CLOSED; 4469 sp->fail_counter[IDX_PAP] = 0; 4470 sp->pp_seq[IDX_PAP] = 0; 4471 sp->pp_rseq[IDX_PAP] = 0; 4472 callout_init(&sp->ch[IDX_PAP], 0); 4473 callout_init(&sp->pap_my_to_ch, 0); 4474 } 4475 4476 static void 4477 sppp_pap_open(struct sppp *sp) 4478 { 4479 if (sp->hisauth.proto == PPP_PAP && 4480 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4481 /* we are authenticator for PAP, start our timer */ 4482 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4483 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4484 } 4485 if (sp->myauth.proto == PPP_PAP) { 4486 /* we are peer, send a request, and start a timer */ 4487 pap.scr(sp); 4488 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4489 sppp_pap_my_TO, sp); 4490 } 4491 } 4492 4493 static void 4494 sppp_pap_close(struct sppp *sp) 4495 { 4496 if (sp->state[IDX_PAP] != STATE_CLOSED) 4497 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4498 } 4499 4500 /* 4501 * That's the timeout routine if we are authenticator. Since the 4502 * authenticator is basically passive in PAP, we can't do much here. 4503 */ 4504 static void 4505 sppp_pap_TO(void *cookie) 4506 { 4507 struct sppp *sp = (struct sppp *)cookie; 4508 STDDCL; 4509 int s; 4510 4511 s = splnet(); 4512 if (debug) 4513 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4514 ifp->if_xname, 4515 sppp_state_name(sp->state[IDX_PAP]), 4516 sp->rst_counter[IDX_PAP]); 4517 4518 if (--sp->rst_counter[IDX_PAP] < 0) 4519 /* TO- event */ 4520 switch (sp->state[IDX_PAP]) { 4521 case STATE_REQ_SENT: 4522 pap.tld(sp); 4523 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4524 break; 4525 } 4526 else 4527 /* TO+ event, not very much we could do */ 4528 switch (sp->state[IDX_PAP]) { 4529 case STATE_REQ_SENT: 4530 /* sppp_cp_change_state() will restart the timer */ 4531 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4532 break; 4533 } 4534 4535 splx(s); 4536 } 4537 4538 /* 4539 * That's the timeout handler if we are peer. Since the peer is active, 4540 * we need to retransmit our PAP request since it is apparently lost. 4541 * XXX We should impose a max counter. 4542 */ 4543 static void 4544 sppp_pap_my_TO(void *cookie) 4545 { 4546 struct sppp *sp = (struct sppp *)cookie; 4547 STDDCL; 4548 4549 if (debug) 4550 log(LOG_DEBUG, "%s: pap peer TO\n", 4551 ifp->if_xname); 4552 4553 pap.scr(sp); 4554 } 4555 4556 static void 4557 sppp_pap_tlu(struct sppp *sp) 4558 { 4559 STDDCL; 4560 int x; 4561 4562 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4563 4564 if (debug) 4565 log(LOG_DEBUG, "%s: %s tlu\n", 4566 ifp->if_xname, pap.name); 4567 4568 x = splnet(); 4569 sp->pp_auth_failures = 0; 4570 /* indicate to LCP that we need to be closed down */ 4571 sp->lcp.protos |= (1 << IDX_PAP); 4572 4573 if (sp->pp_flags & PP_NEEDAUTH) { 4574 /* 4575 * Remote is authenticator, but his auth proto didn't 4576 * complete yet. Defer the transition to network 4577 * phase. 4578 */ 4579 splx(x); 4580 return; 4581 } 4582 splx(x); 4583 sppp_phase_network(sp); 4584 } 4585 4586 static void 4587 sppp_pap_tld(struct sppp *sp) 4588 { 4589 STDDCL; 4590 4591 if (debug) 4592 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4593 callout_stop(&sp->ch[IDX_PAP]); 4594 callout_stop(&sp->pap_my_to_ch); 4595 sp->lcp.protos &= ~(1 << IDX_PAP); 4596 4597 lcp.Close(sp); 4598 } 4599 4600 static void 4601 sppp_pap_scr(struct sppp *sp) 4602 { 4603 u_char idlen, pwdlen; 4604 4605 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4606 /* can't do anything useful */ 4607 printf("%s: pap starting without my name and secret being set\n", 4608 sp->pp_if.if_xname); 4609 return; 4610 } 4611 4612 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4613 pwdlen = sp->myauth.secret_len; 4614 idlen = sp->myauth.name_len; 4615 4616 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4617 sizeof idlen, (const char *)&idlen, 4618 idlen, sp->myauth.name, 4619 sizeof pwdlen, (const char *)&pwdlen, 4620 pwdlen, sp->myauth.secret, 4621 0); 4622 } 4623 4624 /* 4625 * Random miscellaneous functions. 4626 */ 4627 4628 /* 4629 * Send a PAP or CHAP proto packet. 4630 * 4631 * Varadic function, each of the elements for the ellipsis is of type 4632 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4633 * mlen == 0. 4634 * NOTE: never declare variadic functions with types subject to type 4635 * promotion (i.e. u_char). This is asking for big trouble depending 4636 * on the architecture you are on... 4637 */ 4638 4639 static void 4640 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4641 unsigned int type, unsigned int id, 4642 ...) 4643 { 4644 STDDCL; 4645 struct lcp_header *lh; 4646 struct mbuf *m; 4647 u_char *p; 4648 int len; 4649 size_t pkthdrlen; 4650 unsigned int mlen; 4651 const char *msg; 4652 va_list ap; 4653 4654 MGETHDR(m, M_DONTWAIT, MT_DATA); 4655 if (! m) 4656 return; 4657 m->m_pkthdr.rcvif = 0; 4658 4659 if (sp->pp_flags & PP_NOFRAMING) { 4660 *mtod(m, uint16_t *) = htons(cp->proto); 4661 pkthdrlen = 2; 4662 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4663 } else { 4664 struct ppp_header *h; 4665 h = mtod(m, struct ppp_header *); 4666 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4667 h->control = PPP_UI; /* Unnumbered Info */ 4668 h->protocol = htons(cp->proto); 4669 pkthdrlen = PPP_HEADER_LEN; 4670 4671 lh = (struct lcp_header *)(h + 1); 4672 } 4673 4674 lh->type = type; 4675 lh->ident = id; 4676 p = (u_char *)(lh + 1); 4677 4678 va_start(ap, id); 4679 len = 0; 4680 4681 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4682 msg = va_arg(ap, const char *); 4683 len += mlen; 4684 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4685 va_end(ap); 4686 m_freem(m); 4687 return; 4688 } 4689 4690 memcpy(p, msg, mlen); 4691 p += mlen; 4692 } 4693 va_end(ap); 4694 4695 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4696 lh->len = htons(LCP_HEADER_LEN + len); 4697 4698 if (debug) { 4699 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4700 ifp->if_xname, cp->name, 4701 sppp_auth_type_name(cp->proto, lh->type), 4702 lh->ident, ntohs(lh->len)); 4703 if (len) 4704 sppp_print_bytes((u_char *)(lh + 1), len); 4705 addlog(">\n"); 4706 } 4707 if (IF_QFULL(&sp->pp_cpq)) { 4708 IF_DROP(&sp->pp_fastq); 4709 IF_DROP(&ifp->if_snd); 4710 m_freem(m); 4711 ++ifp->if_oerrors; 4712 return; 4713 } else 4714 IF_ENQUEUE(&sp->pp_cpq, m); 4715 if (! (ifp->if_flags & IFF_OACTIVE)) 4716 (*ifp->if_start)(ifp); 4717 ifp->if_obytes += m->m_pkthdr.len + 3; 4718 } 4719 4720 /* 4721 * Send keepalive packets, every 10 seconds. 4722 */ 4723 static void 4724 sppp_keepalive(void *dummy) 4725 { 4726 struct sppp *sp; 4727 int s; 4728 time_t now; 4729 4730 s = splnet(); 4731 now = time_uptime; 4732 for (sp=spppq; sp; sp=sp->pp_next) { 4733 struct ifnet *ifp = &sp->pp_if; 4734 4735 /* check idle timeout */ 4736 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4737 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4738 /* idle timeout is enabled for this interface */ 4739 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4740 if (ifp->if_flags & IFF_DEBUG) 4741 printf("%s: no activity for %lu seconds\n", 4742 sp->pp_if.if_xname, 4743 (unsigned long)(now-sp->pp_last_activity)); 4744 lcp.Close(sp); 4745 continue; 4746 } 4747 } 4748 4749 /* Keepalive mode disabled or channel down? */ 4750 if (! (sp->pp_flags & PP_KEEPALIVE) || 4751 ! (ifp->if_flags & IFF_RUNNING)) 4752 continue; 4753 4754 /* No keepalive in PPP mode if LCP not opened yet. */ 4755 if (! (sp->pp_flags & PP_CISCO) && 4756 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4757 continue; 4758 4759 /* No echo reply, but maybe user data passed through? */ 4760 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4761 sp->pp_alivecnt = 0; 4762 continue; 4763 } 4764 4765 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4766 /* No keepalive packets got. Stop the interface. */ 4767 if_down (ifp); 4768 IF_PURGE(&sp->pp_cpq); 4769 if (! (sp->pp_flags & PP_CISCO)) { 4770 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4771 ifp->if_xname); 4772 sp->pp_alivecnt = 0; 4773 4774 /* we are down, close all open protocols */ 4775 lcp.Close(sp); 4776 4777 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4778 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4779 4780 /* Close connection immediately, completition of this 4781 * will summon the magic needed to reestablish it. */ 4782 if (sp->pp_tlf) 4783 sp->pp_tlf(sp); 4784 continue; 4785 } 4786 } 4787 if (sp->pp_alivecnt < sp->pp_maxalive) 4788 ++sp->pp_alivecnt; 4789 if (sp->pp_flags & PP_CISCO) 4790 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4791 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4792 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4793 int32_t nmagic = htonl(sp->lcp.magic); 4794 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4795 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4796 sp->lcp.echoid, 4, &nmagic); 4797 } 4798 } 4799 splx(s); 4800 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4801 } 4802 4803 #ifdef INET 4804 /* 4805 * Get both IP addresses. 4806 */ 4807 static void 4808 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4809 { 4810 struct ifnet *ifp = &sp->pp_if; 4811 struct ifaddr *ifa; 4812 struct sockaddr_in *si, *sm; 4813 uint32_t ssrc, ddst; 4814 4815 sm = NULL; 4816 ssrc = ddst = 0; 4817 /* 4818 * Pick the first AF_INET address from the list, 4819 * aliases don't make any sense on a p2p link anyway. 4820 */ 4821 si = 0; 4822 IFADDR_FOREACH(ifa, ifp) { 4823 if (ifa->ifa_addr->sa_family == AF_INET) { 4824 si = (struct sockaddr_in *)ifa->ifa_addr; 4825 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4826 if (si) 4827 break; 4828 } 4829 } 4830 if (ifa) { 4831 if (si && si->sin_addr.s_addr) { 4832 ssrc = si->sin_addr.s_addr; 4833 if (srcmask) 4834 *srcmask = ntohl(sm->sin_addr.s_addr); 4835 } 4836 4837 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4838 if (si && si->sin_addr.s_addr) 4839 ddst = si->sin_addr.s_addr; 4840 } 4841 4842 if (dst) *dst = ntohl(ddst); 4843 if (src) *src = ntohl(ssrc); 4844 } 4845 4846 /* 4847 * Set IP addresses. Must be called at splnet. 4848 * If an address is 0, leave it the way it is. 4849 */ 4850 static void 4851 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4852 { 4853 STDDCL; 4854 struct ifaddr *ifa; 4855 struct sockaddr_in *si, *dest; 4856 4857 /* 4858 * Pick the first AF_INET address from the list, 4859 * aliases don't make any sense on a p2p link anyway. 4860 */ 4861 4862 IFADDR_FOREACH(ifa, ifp) { 4863 if (ifa->ifa_addr->sa_family == AF_INET) { 4864 si = (struct sockaddr_in *)ifa->ifa_addr; 4865 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4866 goto found; 4867 } 4868 } 4869 return; 4870 4871 found: 4872 { 4873 int error; 4874 struct sockaddr_in new_sin = *si; 4875 struct sockaddr_in new_dst = *dest; 4876 4877 /* 4878 * Scrub old routes now instead of calling in_ifinit with 4879 * scrub=1, because we may change the dstaddr 4880 * before the call to in_ifinit. 4881 */ 4882 in_ifscrub(ifp, ifatoia(ifa)); 4883 4884 if (myaddr != 0) 4885 new_sin.sin_addr.s_addr = htonl(myaddr); 4886 if (hisaddr != 0) { 4887 new_dst.sin_addr.s_addr = htonl(hisaddr); 4888 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4889 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4890 *dest = new_dst; /* fix dstaddr in place */ 4891 } 4892 } 4893 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4894 if (debug && error) 4895 { 4896 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4897 " failed, error=%d\n", ifp->if_xname, error); 4898 } 4899 if (!error) { 4900 (void)pfil_run_hooks(if_pfil, 4901 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4902 } 4903 } 4904 } 4905 4906 /* 4907 * Clear IP addresses. Must be called at splnet. 4908 */ 4909 static void 4910 sppp_clear_ip_addrs(struct sppp *sp) 4911 { 4912 struct ifnet *ifp = &sp->pp_if; 4913 struct ifaddr *ifa; 4914 struct sockaddr_in *si, *dest; 4915 4916 uint32_t remote; 4917 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4918 remote = sp->ipcp.saved_hisaddr; 4919 else 4920 sppp_get_ip_addrs(sp, 0, &remote, 0); 4921 4922 /* 4923 * Pick the first AF_INET address from the list, 4924 * aliases don't make any sense on a p2p link anyway. 4925 */ 4926 4927 IFADDR_FOREACH(ifa, ifp) { 4928 if (ifa->ifa_addr->sa_family == AF_INET) { 4929 si = (struct sockaddr_in *)ifa->ifa_addr; 4930 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4931 goto found; 4932 } 4933 } 4934 return; 4935 4936 found: 4937 { 4938 struct sockaddr_in new_sin = *si; 4939 4940 in_ifscrub(ifp, ifatoia(ifa)); 4941 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4942 new_sin.sin_addr.s_addr = 0; 4943 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4944 /* replace peer addr in place */ 4945 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4946 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4947 (void)pfil_run_hooks(if_pfil, 4948 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4949 } 4950 } 4951 #endif 4952 4953 #ifdef INET6 4954 /* 4955 * Get both IPv6 addresses. 4956 */ 4957 static void 4958 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4959 struct in6_addr *srcmask) 4960 { 4961 struct ifnet *ifp = &sp->pp_if; 4962 struct ifaddr *ifa; 4963 struct sockaddr_in6 *si, *sm; 4964 struct in6_addr ssrc, ddst; 4965 4966 sm = NULL; 4967 memset(&ssrc, 0, sizeof(ssrc)); 4968 memset(&ddst, 0, sizeof(ddst)); 4969 /* 4970 * Pick the first link-local AF_INET6 address from the list, 4971 * aliases don't make any sense on a p2p link anyway. 4972 */ 4973 si = 0; 4974 IFADDR_FOREACH(ifa, ifp) 4975 if (ifa->ifa_addr->sa_family == AF_INET6) { 4976 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4977 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4978 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4979 break; 4980 } 4981 if (ifa) { 4982 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4983 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4984 if (srcmask) { 4985 memcpy(srcmask, &sm->sin6_addr, 4986 sizeof(*srcmask)); 4987 } 4988 } 4989 4990 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4991 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4992 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4993 } 4994 4995 if (dst) 4996 memcpy(dst, &ddst, sizeof(*dst)); 4997 if (src) 4998 memcpy(src, &ssrc, sizeof(*src)); 4999 } 5000 5001 #ifdef IPV6CP_MYIFID_DYN 5002 /* 5003 * Generate random ifid. 5004 */ 5005 static void 5006 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5007 { 5008 /* TBD */ 5009 } 5010 5011 /* 5012 * Set my IPv6 address. Must be called at splnet. 5013 */ 5014 static void 5015 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5016 { 5017 STDDCL; 5018 struct ifaddr *ifa; 5019 struct sockaddr_in6 *sin6; 5020 5021 /* 5022 * Pick the first link-local AF_INET6 address from the list, 5023 * aliases don't make any sense on a p2p link anyway. 5024 */ 5025 5026 sin6 = NULL; 5027 IFADDR_FOREACH(ifa, ifp) 5028 { 5029 if (ifa->ifa_addr->sa_family == AF_INET6) 5030 { 5031 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5032 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5033 break; 5034 } 5035 } 5036 5037 if (ifa && sin6) 5038 { 5039 int error; 5040 struct sockaddr_in6 new_sin6 = *sin6; 5041 5042 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5043 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5044 if (debug && error) 5045 { 5046 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5047 " failed, error=%d\n", ifp->if_xname, error); 5048 } 5049 if (!error) { 5050 (void)pfil_run_hooks(if_pfil, 5051 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5052 } 5053 } 5054 } 5055 #endif 5056 5057 /* 5058 * Suggest a candidate address to be used by peer. 5059 */ 5060 static void 5061 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5062 { 5063 struct in6_addr myaddr; 5064 struct timeval tv; 5065 5066 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5067 5068 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5069 microtime(&tv); 5070 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5071 myaddr.s6_addr[14] ^= 0xff; 5072 myaddr.s6_addr[15] ^= 0xff; 5073 } else { 5074 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5075 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5076 } 5077 if (suggest) 5078 memcpy(suggest, &myaddr, sizeof(myaddr)); 5079 } 5080 #endif /*INET6*/ 5081 5082 /* 5083 * Process ioctl requests specific to the PPP interface. 5084 * Permissions have already been checked. 5085 */ 5086 static int 5087 sppp_params(struct sppp *sp, u_long cmd, void *data) 5088 { 5089 switch (cmd) { 5090 case SPPPGETAUTHCFG: 5091 { 5092 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5093 int error; 5094 size_t len; 5095 5096 cfg->myauthflags = sp->myauth.flags; 5097 cfg->hisauthflags = sp->hisauth.flags; 5098 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5099 cfg->hisauth = 0; 5100 if (sp->hisauth.proto) 5101 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5102 cfg->myauth = 0; 5103 if (sp->myauth.proto) 5104 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5105 if (cfg->myname_length == 0) { 5106 if (sp->myauth.name != NULL) 5107 cfg->myname_length = sp->myauth.name_len + 1; 5108 } else { 5109 if (sp->myauth.name == NULL) { 5110 cfg->myname_length = 0; 5111 } else { 5112 len = sp->myauth.name_len + 1; 5113 if (cfg->myname_length < len) 5114 return (ENAMETOOLONG); 5115 error = copyout(sp->myauth.name, cfg->myname, len); 5116 if (error) return error; 5117 } 5118 } 5119 if (cfg->hisname_length == 0) { 5120 if (sp->hisauth.name != NULL) 5121 cfg->hisname_length = sp->hisauth.name_len + 1; 5122 } else { 5123 if (sp->hisauth.name == NULL) { 5124 cfg->hisname_length = 0; 5125 } else { 5126 len = sp->hisauth.name_len + 1; 5127 if (cfg->hisname_length < len) 5128 return (ENAMETOOLONG); 5129 error = copyout(sp->hisauth.name, cfg->hisname, len); 5130 if (error) return error; 5131 } 5132 } 5133 } 5134 break; 5135 case SPPPSETAUTHCFG: 5136 { 5137 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5138 int error; 5139 5140 if (sp->myauth.name) { 5141 free(sp->myauth.name, M_DEVBUF); 5142 sp->myauth.name = NULL; 5143 } 5144 if (sp->myauth.secret) { 5145 free(sp->myauth.secret, M_DEVBUF); 5146 sp->myauth.secret = NULL; 5147 } 5148 if (sp->hisauth.name) { 5149 free(sp->hisauth.name, M_DEVBUF); 5150 sp->hisauth.name = NULL; 5151 } 5152 if (sp->hisauth.secret) { 5153 free(sp->hisauth.secret, M_DEVBUF); 5154 sp->hisauth.secret = NULL; 5155 } 5156 5157 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5158 if (cfg->hisname_length >= MCLBYTES) 5159 return (ENAMETOOLONG); 5160 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5161 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5162 if (error) { 5163 free(sp->hisauth.name, M_DEVBUF); 5164 sp->hisauth.name = NULL; 5165 return error; 5166 } 5167 sp->hisauth.name_len = cfg->hisname_length - 1; 5168 sp->hisauth.name[sp->hisauth.name_len] = 0; 5169 } 5170 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5171 if (cfg->hissecret_length >= MCLBYTES) 5172 return (ENAMETOOLONG); 5173 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5174 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5175 if (error) { 5176 free(sp->hisauth.secret, M_DEVBUF); 5177 sp->hisauth.secret = NULL; 5178 return error; 5179 } 5180 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5181 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5182 } 5183 if (cfg->myname != NULL && cfg->myname_length > 0) { 5184 if (cfg->myname_length >= MCLBYTES) 5185 return (ENAMETOOLONG); 5186 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5187 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5188 if (error) { 5189 free(sp->myauth.name, M_DEVBUF); 5190 sp->myauth.name = NULL; 5191 return error; 5192 } 5193 sp->myauth.name_len = cfg->myname_length - 1; 5194 sp->myauth.name[sp->myauth.name_len] = 0; 5195 } 5196 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5197 if (cfg->mysecret_length >= MCLBYTES) 5198 return (ENAMETOOLONG); 5199 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5200 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5201 if (error) { 5202 free(sp->myauth.secret, M_DEVBUF); 5203 sp->myauth.secret = NULL; 5204 return error; 5205 } 5206 sp->myauth.secret_len = cfg->mysecret_length - 1; 5207 sp->myauth.secret[sp->myauth.secret_len] = 0; 5208 } 5209 sp->myauth.flags = cfg->myauthflags; 5210 if (cfg->myauth) 5211 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5212 sp->hisauth.flags = cfg->hisauthflags; 5213 if (cfg->hisauth) 5214 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5215 sp->pp_auth_failures = 0; 5216 if (sp->hisauth.proto != 0) 5217 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5218 else 5219 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5220 } 5221 break; 5222 case SPPPGETLCPCFG: 5223 { 5224 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5225 lcpp->lcp_timeout = sp->lcp.timeout; 5226 } 5227 break; 5228 case SPPPSETLCPCFG: 5229 { 5230 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5231 sp->lcp.timeout = lcpp->lcp_timeout; 5232 } 5233 break; 5234 case SPPPGETSTATUS: 5235 { 5236 struct spppstatus *status = (struct spppstatus *)data; 5237 status->phase = sp->pp_phase; 5238 } 5239 break; 5240 case SPPPGETSTATUSNCP: 5241 { 5242 struct spppstatusncp *status = (struct spppstatusncp *)data; 5243 status->phase = sp->pp_phase; 5244 status->ncpup = sppp_ncp_check(sp); 5245 } 5246 break; 5247 case SPPPGETIDLETO: 5248 { 5249 struct spppidletimeout *to = (struct spppidletimeout *)data; 5250 to->idle_seconds = sp->pp_idle_timeout; 5251 } 5252 break; 5253 case SPPPSETIDLETO: 5254 { 5255 struct spppidletimeout *to = (struct spppidletimeout *)data; 5256 sp->pp_idle_timeout = to->idle_seconds; 5257 } 5258 break; 5259 case SPPPSETAUTHFAILURE: 5260 { 5261 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5262 sp->pp_max_auth_fail = afsettings->max_failures; 5263 sp->pp_auth_failures = 0; 5264 } 5265 break; 5266 case SPPPGETAUTHFAILURES: 5267 { 5268 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5269 stats->auth_failures = sp->pp_auth_failures; 5270 stats->max_failures = sp->pp_max_auth_fail; 5271 } 5272 break; 5273 case SPPPSETDNSOPTS: 5274 { 5275 struct spppdnssettings *req = (struct spppdnssettings *)data; 5276 sp->query_dns = req->query_dns & 3; 5277 } 5278 break; 5279 case SPPPGETDNSOPTS: 5280 { 5281 struct spppdnssettings *req = (struct spppdnssettings *)data; 5282 req->query_dns = sp->query_dns; 5283 } 5284 break; 5285 case SPPPGETDNSADDRS: 5286 { 5287 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5288 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5289 } 5290 break; 5291 case SPPPGETKEEPALIVE: 5292 { 5293 struct spppkeepalivesettings *settings = 5294 (struct spppkeepalivesettings*)data; 5295 settings->maxalive = sp->pp_maxalive; 5296 settings->max_noreceive = sp->pp_max_noreceive; 5297 } 5298 break; 5299 case SPPPSETKEEPALIVE: 5300 { 5301 struct spppkeepalivesettings *settings = 5302 (struct spppkeepalivesettings*)data; 5303 sp->pp_maxalive = settings->maxalive; 5304 sp->pp_max_noreceive = settings->max_noreceive; 5305 } 5306 break; 5307 #if defined(COMPAT_50) || defined(MODULAR) 5308 case __SPPPGETIDLETO50: 5309 { 5310 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5311 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5312 } 5313 break; 5314 case __SPPPSETIDLETO50: 5315 { 5316 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5317 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5318 } 5319 break; 5320 case __SPPPGETKEEPALIVE50: 5321 { 5322 struct spppkeepalivesettings50 *settings = 5323 (struct spppkeepalivesettings50*)data; 5324 settings->maxalive = sp->pp_maxalive; 5325 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5326 } 5327 break; 5328 case __SPPPSETKEEPALIVE50: 5329 { 5330 struct spppkeepalivesettings50 *settings = 5331 (struct spppkeepalivesettings50*)data; 5332 sp->pp_maxalive = settings->maxalive; 5333 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5334 } 5335 break; 5336 #endif /* COMPAT_50 || MODULAR */ 5337 default: 5338 return (EINVAL); 5339 } 5340 5341 return (0); 5342 } 5343 5344 static void 5345 sppp_phase_network(struct sppp *sp) 5346 { 5347 STDDCL; 5348 int i; 5349 uint32_t mask; 5350 5351 sp->pp_phase = SPPP_PHASE_NETWORK; 5352 5353 if (debug) 5354 { 5355 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5356 sppp_phase_name(sp->pp_phase)); 5357 } 5358 5359 /* Notify NCPs now. */ 5360 for (i = 0; i < IDX_COUNT; i++) 5361 if ((cps[i])->flags & CP_NCP) 5362 (cps[i])->Open(sp); 5363 5364 /* Send Up events to all NCPs. */ 5365 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5366 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5367 (cps[i])->Up(sp); 5368 5369 /* if no NCP is starting, all this was in vain, close down */ 5370 sppp_lcp_check_and_close(sp); 5371 } 5372 5373 5374 static const char * 5375 sppp_cp_type_name(u_char type) 5376 { 5377 static char buf[12]; 5378 switch (type) { 5379 case CONF_REQ: return "conf-req"; 5380 case CONF_ACK: return "conf-ack"; 5381 case CONF_NAK: return "conf-nak"; 5382 case CONF_REJ: return "conf-rej"; 5383 case TERM_REQ: return "term-req"; 5384 case TERM_ACK: return "term-ack"; 5385 case CODE_REJ: return "code-rej"; 5386 case PROTO_REJ: return "proto-rej"; 5387 case ECHO_REQ: return "echo-req"; 5388 case ECHO_REPLY: return "echo-reply"; 5389 case DISC_REQ: return "discard-req"; 5390 } 5391 snprintf(buf, sizeof(buf), "0x%x", type); 5392 return buf; 5393 } 5394 5395 static const char * 5396 sppp_auth_type_name(u_short proto, u_char type) 5397 { 5398 static char buf[12]; 5399 switch (proto) { 5400 case PPP_CHAP: 5401 switch (type) { 5402 case CHAP_CHALLENGE: return "challenge"; 5403 case CHAP_RESPONSE: return "response"; 5404 case CHAP_SUCCESS: return "success"; 5405 case CHAP_FAILURE: return "failure"; 5406 } 5407 case PPP_PAP: 5408 switch (type) { 5409 case PAP_REQ: return "req"; 5410 case PAP_ACK: return "ack"; 5411 case PAP_NAK: return "nak"; 5412 } 5413 } 5414 snprintf(buf, sizeof(buf), "0x%x", type); 5415 return buf; 5416 } 5417 5418 static const char * 5419 sppp_lcp_opt_name(u_char opt) 5420 { 5421 static char buf[12]; 5422 switch (opt) { 5423 case LCP_OPT_MRU: return "mru"; 5424 case LCP_OPT_ASYNC_MAP: return "async-map"; 5425 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5426 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5427 case LCP_OPT_MAGIC: return "magic"; 5428 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5429 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5430 } 5431 snprintf(buf, sizeof(buf), "0x%x", opt); 5432 return buf; 5433 } 5434 5435 static const char * 5436 sppp_ipcp_opt_name(u_char opt) 5437 { 5438 static char buf[12]; 5439 switch (opt) { 5440 case IPCP_OPT_ADDRESSES: return "addresses"; 5441 case IPCP_OPT_COMPRESSION: return "compression"; 5442 case IPCP_OPT_ADDRESS: return "address"; 5443 } 5444 snprintf(buf, sizeof(buf), "0x%x", opt); 5445 return buf; 5446 } 5447 5448 #ifdef INET6 5449 static const char * 5450 sppp_ipv6cp_opt_name(u_char opt) 5451 { 5452 static char buf[12]; 5453 switch (opt) { 5454 case IPV6CP_OPT_IFID: return "ifid"; 5455 case IPV6CP_OPT_COMPRESSION: return "compression"; 5456 } 5457 snprintf(buf, sizeof(buf), "0x%x", opt); 5458 return buf; 5459 } 5460 #endif 5461 5462 static const char * 5463 sppp_state_name(int state) 5464 { 5465 switch (state) { 5466 case STATE_INITIAL: return "initial"; 5467 case STATE_STARTING: return "starting"; 5468 case STATE_CLOSED: return "closed"; 5469 case STATE_STOPPED: return "stopped"; 5470 case STATE_CLOSING: return "closing"; 5471 case STATE_STOPPING: return "stopping"; 5472 case STATE_REQ_SENT: return "req-sent"; 5473 case STATE_ACK_RCVD: return "ack-rcvd"; 5474 case STATE_ACK_SENT: return "ack-sent"; 5475 case STATE_OPENED: return "opened"; 5476 } 5477 return "illegal"; 5478 } 5479 5480 static const char * 5481 sppp_phase_name(int phase) 5482 { 5483 switch (phase) { 5484 case SPPP_PHASE_DEAD: return "dead"; 5485 case SPPP_PHASE_ESTABLISH: return "establish"; 5486 case SPPP_PHASE_TERMINATE: return "terminate"; 5487 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5488 case SPPP_PHASE_NETWORK: return "network"; 5489 } 5490 return "illegal"; 5491 } 5492 5493 static const char * 5494 sppp_proto_name(u_short proto) 5495 { 5496 static char buf[12]; 5497 switch (proto) { 5498 case PPP_LCP: return "lcp"; 5499 case PPP_IPCP: return "ipcp"; 5500 case PPP_PAP: return "pap"; 5501 case PPP_CHAP: return "chap"; 5502 case PPP_IPV6CP: return "ipv6cp"; 5503 } 5504 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5505 return buf; 5506 } 5507 5508 static void 5509 sppp_print_bytes(const u_char *p, u_short len) 5510 { 5511 addlog(" %02x", *p++); 5512 while (--len > 0) 5513 addlog("-%02x", *p++); 5514 } 5515 5516 static void 5517 sppp_print_string(const char *p, u_short len) 5518 { 5519 u_char c; 5520 5521 while (len-- > 0) { 5522 c = *p++; 5523 /* 5524 * Print only ASCII chars directly. RFC 1994 recommends 5525 * using only them, but we don't rely on it. */ 5526 if (c < ' ' || c > '~') 5527 addlog("\\x%x", c); 5528 else 5529 addlog("%c", c); 5530 } 5531 } 5532 5533 static const char * 5534 sppp_dotted_quad(uint32_t addr) 5535 { 5536 static char s[16]; 5537 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5538 (int)((addr >> 24) & 0xff), 5539 (int)((addr >> 16) & 0xff), 5540 (int)((addr >> 8) & 0xff), 5541 (int)(addr & 0xff)); 5542 return s; 5543 } 5544 5545 /* a dummy, used to drop uninteresting events */ 5546 static void 5547 sppp_null(struct sppp *unused) 5548 { 5549 /* do just nothing */ 5550 } 5551 /* 5552 * This file is large. Tell emacs to highlight it nevertheless. 5553 * 5554 * Local Variables: 5555 * hilit-auto-highlight-maxout: 120000 5556 * End: 5557 */ 5558
Indexes created Tue Oct 14 11:09:46 GMT 2025