if_spppsubr.c revision 1.115
1 /* $NetBSD: if_spppsubr.c,v 1.115 2008/11/07 00:20:13 dyoung 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 1.115 2008/11/07 00:20:13 dyoung Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_pfil_hooks.h" 50 51 #include <sys/param.h> 52 #include <sys/proc.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/sockio.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/callout.h> 61 #include <sys/md5.h> 62 #include <sys/inttypes.h> 63 #include <sys/kauth.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/if_types.h> 68 #include <net/route.h> 69 #include <net/ppp_defs.h> 70 71 #include <machine/stdarg.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #ifdef INET 77 #include <netinet/ip.h> 78 #include <netinet/tcp.h> 79 #endif 80 #include <net/ethertypes.h> 81 82 #ifdef INET6 83 #include <netinet6/scope6_var.h> 84 #endif 85 86 #ifdef IPX 87 #include <netipx/ipx.h> 88 #include <netipx/ipx_if.h> 89 #endif 90 91 92 #ifdef ISO 93 #include <netiso/argo_debug.h> 94 #include <netiso/iso.h> 95 #include <netiso/iso_var.h> 96 #include <netiso/iso_snpac.h> 97 #endif 98 99 #include <net/if_sppp.h> 100 #include <net/if_spppvar.h> 101 102 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 103 #define LOOPALIVECNT 3 /* loopback detection tries */ 104 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 105 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 106 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define CONF_REQ 1 /* PPP configure request */ 133 #define CONF_ACK 2 /* PPP configure acknowledge */ 134 #define CONF_NAK 3 /* PPP configure negative ack */ 135 #define CONF_REJ 4 /* PPP configure reject */ 136 #define TERM_REQ 5 /* PPP terminate request */ 137 #define TERM_ACK 6 /* PPP terminate acknowledge */ 138 #define CODE_REJ 7 /* PPP code reject */ 139 #define PROTO_REJ 8 /* PPP protocol reject */ 140 #define ECHO_REQ 9 /* PPP echo request */ 141 #define ECHO_REPLY 10 /* PPP echo reply */ 142 #define DISC_REQ 11 /* PPP discard request */ 143 144 #define LCP_OPT_MRU 1 /* maximum receive unit */ 145 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 146 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 147 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 148 #define LCP_OPT_MAGIC 5 /* magic number */ 149 #define LCP_OPT_RESERVED 6 /* reserved */ 150 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 151 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 152 153 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 154 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 155 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 156 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 157 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 158 159 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 160 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 161 162 #define PAP_REQ 1 /* PAP name/password request */ 163 #define PAP_ACK 2 /* PAP acknowledge */ 164 #define PAP_NAK 3 /* PAP fail */ 165 166 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 167 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 168 #define CHAP_SUCCESS 3 /* CHAP response ok */ 169 #define CHAP_FAILURE 4 /* CHAP response failed */ 170 171 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 172 173 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 174 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 175 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 176 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 177 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 178 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 179 180 /* states are named and numbered according to RFC 1661 */ 181 #define STATE_INITIAL 0 182 #define STATE_STARTING 1 183 #define STATE_CLOSED 2 184 #define STATE_STOPPED 3 185 #define STATE_CLOSING 4 186 #define STATE_STOPPING 5 187 #define STATE_REQ_SENT 6 188 #define STATE_ACK_RCVD 7 189 #define STATE_ACK_SENT 8 190 #define STATE_OPENED 9 191 192 struct ppp_header { 193 uint8_t address; 194 uint8_t control; 195 uint16_t protocol; 196 } __packed; 197 #define PPP_HEADER_LEN sizeof (struct ppp_header) 198 199 struct lcp_header { 200 uint8_t type; 201 uint8_t ident; 202 uint16_t len; 203 } __packed; 204 #define LCP_HEADER_LEN sizeof (struct lcp_header) 205 206 struct cisco_packet { 207 uint32_t type; 208 uint32_t par1; 209 uint32_t par2; 210 uint16_t rel; 211 uint16_t time0; 212 uint16_t time1; 213 } __packed; 214 #define CISCO_PACKET_LEN 18 215 216 /* 217 * We follow the spelling and capitalization of RFC 1661 here, to make 218 * it easier comparing with the standard. Please refer to this RFC in 219 * case you can't make sense out of these abbreviation; it will also 220 * explain the semantics related to the various events and actions. 221 */ 222 struct cp { 223 u_short proto; /* PPP control protocol number */ 224 u_char protoidx; /* index into state table in struct sppp */ 225 u_char flags; 226 #define CP_LCP 0x01 /* this is the LCP */ 227 #define CP_AUTH 0x02 /* this is an authentication protocol */ 228 #define CP_NCP 0x04 /* this is a NCP */ 229 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 230 const char *name; /* name of this control protocol */ 231 /* event handlers */ 232 void (*Up)(struct sppp *sp); 233 void (*Down)(struct sppp *sp); 234 void (*Open)(struct sppp *sp); 235 void (*Close)(struct sppp *sp); 236 void (*TO)(void *sp); 237 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 239 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 240 /* actions */ 241 void (*tlu)(struct sppp *sp); 242 void (*tld)(struct sppp *sp); 243 void (*tls)(struct sppp *sp); 244 void (*tlf)(struct sppp *sp); 245 void (*scr)(struct sppp *sp); 246 }; 247 248 static struct sppp *spppq; 249 static callout_t keepalive_ch; 250 251 #ifdef INET 252 /* 253 * The following disgusting hack gets around the problem that IP TOS 254 * can't be set yet. We want to put "interactive" traffic on a high 255 * priority queue. To decide if traffic is interactive, we check that 256 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 257 * 258 * XXX is this really still necessary? - joerg - 259 */ 260 static u_short interactive_ports[8] = { 261 0, 513, 0, 0, 262 0, 21, 0, 23, 263 }; 264 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 265 #endif 266 267 /* almost every function needs these */ 268 #define STDDCL \ 269 struct ifnet *ifp = &sp->pp_if; \ 270 int debug = ifp->if_flags & IFF_DEBUG 271 272 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 273 const struct sockaddr *dst, struct rtentry *rt); 274 275 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 276 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 277 278 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 279 struct mbuf *m); 280 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 281 u_char ident, u_short len, void *data); 282 /* static void sppp_cp_timeout(void *arg); */ 283 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 284 int newstate); 285 static void sppp_auth_send(const struct cp *cp, 286 struct sppp *sp, unsigned int type, unsigned int id, 287 ...); 288 289 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 293 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 294 295 static void sppp_null(struct sppp *sp); 296 297 static void sppp_lcp_init(struct sppp *sp); 298 static void sppp_lcp_up(struct sppp *sp); 299 static void sppp_lcp_down(struct sppp *sp); 300 static void sppp_lcp_open(struct sppp *sp); 301 static void sppp_lcp_close(struct sppp *sp); 302 static void sppp_lcp_TO(void *sp); 303 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 306 static void sppp_lcp_tlu(struct sppp *sp); 307 static void sppp_lcp_tld(struct sppp *sp); 308 static void sppp_lcp_tls(struct sppp *sp); 309 static void sppp_lcp_tlf(struct sppp *sp); 310 static void sppp_lcp_scr(struct sppp *sp); 311 static void sppp_lcp_check_and_close(struct sppp *sp); 312 static int sppp_ncp_check(struct sppp *sp); 313 314 static void sppp_ipcp_init(struct sppp *sp); 315 static void sppp_ipcp_up(struct sppp *sp); 316 static void sppp_ipcp_down(struct sppp *sp); 317 static void sppp_ipcp_open(struct sppp *sp); 318 static void sppp_ipcp_close(struct sppp *sp); 319 static void sppp_ipcp_TO(void *sp); 320 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipcp_tlu(struct sppp *sp); 324 static void sppp_ipcp_tld(struct sppp *sp); 325 static void sppp_ipcp_tls(struct sppp *sp); 326 static void sppp_ipcp_tlf(struct sppp *sp); 327 static void sppp_ipcp_scr(struct sppp *sp); 328 329 static void sppp_ipv6cp_init(struct sppp *sp); 330 static void sppp_ipv6cp_up(struct sppp *sp); 331 static void sppp_ipv6cp_down(struct sppp *sp); 332 static void sppp_ipv6cp_open(struct sppp *sp); 333 static void sppp_ipv6cp_close(struct sppp *sp); 334 static void sppp_ipv6cp_TO(void *sp); 335 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 338 static void sppp_ipv6cp_tlu(struct sppp *sp); 339 static void sppp_ipv6cp_tld(struct sppp *sp); 340 static void sppp_ipv6cp_tls(struct sppp *sp); 341 static void sppp_ipv6cp_tlf(struct sppp *sp); 342 static void sppp_ipv6cp_scr(struct sppp *sp); 343 344 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_pap_init(struct sppp *sp); 346 static void sppp_pap_open(struct sppp *sp); 347 static void sppp_pap_close(struct sppp *sp); 348 static void sppp_pap_TO(void *sp); 349 static void sppp_pap_my_TO(void *sp); 350 static void sppp_pap_tlu(struct sppp *sp); 351 static void sppp_pap_tld(struct sppp *sp); 352 static void sppp_pap_scr(struct sppp *sp); 353 354 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 355 static void sppp_chap_init(struct sppp *sp); 356 static void sppp_chap_open(struct sppp *sp); 357 static void sppp_chap_close(struct sppp *sp); 358 static void sppp_chap_TO(void *sp); 359 static void sppp_chap_tlu(struct sppp *sp); 360 static void sppp_chap_tld(struct sppp *sp); 361 static void sppp_chap_scr(struct sppp *sp); 362 363 static const char *sppp_auth_type_name(u_short proto, u_char type); 364 static const char *sppp_cp_type_name(u_char type); 365 static const char *sppp_dotted_quad(uint32_t addr); 366 static const char *sppp_ipcp_opt_name(u_char opt); 367 #ifdef INET6 368 static const char *sppp_ipv6cp_opt_name(u_char opt); 369 #endif 370 static const char *sppp_lcp_opt_name(u_char opt); 371 static const char *sppp_phase_name(int phase); 372 static const char *sppp_proto_name(u_short proto); 373 static const char *sppp_state_name(int state); 374 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 375 #ifdef INET 376 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 377 uint32_t *srcmask); 378 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #endif 381 static void sppp_keepalive(void *dummy); 382 static void sppp_phase_network(struct sppp *sp); 383 static void sppp_print_bytes(const u_char *p, u_short len); 384 static void sppp_print_string(const char *p, u_short len); 385 #ifdef INET6 386 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 387 struct in6_addr *dst, struct in6_addr *srcmask); 388 #ifdef IPV6CP_MYIFID_DYN 389 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 390 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 391 #endif 392 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 393 #endif 394 395 /* our control protocol descriptors */ 396 static const struct cp lcp = { 397 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 398 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 399 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 400 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 401 sppp_lcp_scr 402 }; 403 404 static const struct cp ipcp = { 405 PPP_IPCP, IDX_IPCP, 406 #ifdef INET 407 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 408 #else 409 0, 410 #endif 411 "ipcp", 412 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 413 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 414 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 415 sppp_ipcp_scr 416 }; 417 418 static const struct cp ipv6cp = { 419 PPP_IPV6CP, IDX_IPV6CP, 420 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 421 CP_NCP, 422 #else 423 0, 424 #endif 425 "ipv6cp", 426 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 427 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 428 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 429 sppp_ipv6cp_scr 430 }; 431 432 static const struct cp pap = { 433 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 434 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 435 sppp_pap_TO, 0, 0, 0, 436 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 437 sppp_pap_scr 438 }; 439 440 static const struct cp chap = { 441 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 442 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 443 sppp_chap_TO, 0, 0, 0, 444 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 445 sppp_chap_scr 446 }; 447 448 static const struct cp *cps[IDX_COUNT] = { 449 &lcp, /* IDX_LCP */ 450 &ipcp, /* IDX_IPCP */ 451 &ipv6cp, /* IDX_IPV6CP */ 452 &pap, /* IDX_PAP */ 453 &chap, /* IDX_CHAP */ 454 }; 455 456 457 void spppattach(int); 458 void 459 /*ARGSUSED*/ 460 spppattach(int count) 461 { 462 } 463 464 /* 465 * Exported functions, comprising our interface to the lower layer. 466 */ 467 468 /* 469 * Process the received packet. 470 */ 471 void 472 sppp_input(struct ifnet *ifp, struct mbuf *m) 473 { 474 struct ppp_header *h = NULL; 475 struct ifqueue *inq = 0; 476 uint16_t protocol; 477 int s; 478 struct sppp *sp = (struct sppp *)ifp; 479 int debug = ifp->if_flags & IFF_DEBUG; 480 481 if (ifp->if_flags & IFF_UP) { 482 /* Count received bytes, add hardware framing */ 483 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 484 /* Note time of last receive */ 485 sp->pp_last_receive = time_uptime; 486 } 487 488 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 489 /* Too small packet, drop it. */ 490 if (debug) 491 log(LOG_DEBUG, 492 "%s: input packet is too small, %d bytes\n", 493 ifp->if_xname, m->m_pkthdr.len); 494 drop: 495 ++ifp->if_ierrors; 496 ++ifp->if_iqdrops; 497 m_freem(m); 498 return; 499 } 500 501 if (sp->pp_flags & PP_NOFRAMING) { 502 memcpy(&protocol, mtod(m, void *), 2); 503 protocol = ntohs(protocol); 504 m_adj(m, 2); 505 } else { 506 507 /* Get PPP header. */ 508 h = mtod(m, struct ppp_header *); 509 m_adj(m, PPP_HEADER_LEN); 510 511 switch (h->address) { 512 case PPP_ALLSTATIONS: 513 if (h->control != PPP_UI) 514 goto invalid; 515 if (sp->pp_flags & PP_CISCO) { 516 if (debug) 517 log(LOG_DEBUG, 518 "%s: PPP packet in Cisco mode " 519 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 520 ifp->if_xname, 521 h->address, h->control, ntohs(h->protocol)); 522 goto drop; 523 } 524 break; 525 case CISCO_MULTICAST: 526 case CISCO_UNICAST: 527 /* Don't check the control field here (RFC 1547). */ 528 if (! (sp->pp_flags & PP_CISCO)) { 529 if (debug) 530 log(LOG_DEBUG, 531 "%s: Cisco packet in PPP mode " 532 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 533 ifp->if_xname, 534 h->address, h->control, ntohs(h->protocol)); 535 goto drop; 536 } 537 switch (ntohs(h->protocol)) { 538 default: 539 ++ifp->if_noproto; 540 goto invalid; 541 case CISCO_KEEPALIVE: 542 sppp_cisco_input((struct sppp *) ifp, m); 543 m_freem(m); 544 return; 545 #ifdef INET 546 case ETHERTYPE_IP: 547 schednetisr(NETISR_IP); 548 inq = &ipintrq; 549 break; 550 #endif 551 #ifdef INET6 552 case ETHERTYPE_IPV6: 553 schednetisr(NETISR_IPV6); 554 inq = &ip6intrq; 555 break; 556 #endif 557 #ifdef IPX 558 case ETHERTYPE_IPX: 559 schednetisr(NETISR_IPX); 560 inq = &ipxintrq; 561 break; 562 #endif 563 } 564 goto queue_pkt; 565 default: /* Invalid PPP packet. */ 566 invalid: 567 if (debug) 568 log(LOG_DEBUG, 569 "%s: invalid input packet " 570 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 571 ifp->if_xname, 572 h->address, h->control, ntohs(h->protocol)); 573 goto drop; 574 } 575 protocol = ntohs(h->protocol); 576 } 577 578 switch (protocol) { 579 default: 580 if (sp->state[IDX_LCP] == STATE_OPENED) { 581 uint16_t prot = htons(protocol); 582 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 583 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 584 &prot); 585 } 586 if (debug) 587 log(LOG_DEBUG, 588 "%s: invalid input protocol " 589 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 590 ++ifp->if_noproto; 591 goto drop; 592 case PPP_LCP: 593 sppp_cp_input(&lcp, sp, m); 594 m_freem(m); 595 return; 596 case PPP_PAP: 597 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 598 sppp_pap_input(sp, m); 599 m_freem(m); 600 return; 601 case PPP_CHAP: 602 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 603 sppp_chap_input(sp, m); 604 m_freem(m); 605 return; 606 #ifdef INET 607 case PPP_IPCP: 608 if (sp->pp_phase == SPPP_PHASE_NETWORK) 609 sppp_cp_input(&ipcp, sp, m); 610 m_freem(m); 611 return; 612 case PPP_IP: 613 if (sp->state[IDX_IPCP] == STATE_OPENED) { 614 schednetisr(NETISR_IP); 615 inq = &ipintrq; 616 sp->pp_last_activity = time_uptime; 617 } 618 break; 619 #endif 620 #ifdef INET6 621 case PPP_IPV6CP: 622 if (sp->pp_phase == SPPP_PHASE_NETWORK) 623 sppp_cp_input(&ipv6cp, sp, m); 624 m_freem(m); 625 return; 626 627 case PPP_IPV6: 628 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 629 schednetisr(NETISR_IPV6); 630 inq = &ip6intrq; 631 sp->pp_last_activity = time_uptime; 632 } 633 break; 634 #endif 635 #ifdef IPX 636 case PPP_IPX: 637 /* IPX IPXCP not implemented yet */ 638 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 639 schednetisr(NETISR_IPX); 640 inq = &ipxintrq; 641 } 642 break; 643 #endif 644 #ifdef ISO 645 case PPP_ISO: 646 /* OSI NLCP not implemented yet */ 647 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 648 schednetisr(NETISR_ISO); 649 inq = &clnlintrq; 650 } 651 break; 652 #endif 653 } 654 655 queue_pkt: 656 if (! (ifp->if_flags & IFF_UP) || ! inq) 657 goto drop; 658 659 /* Check queue. */ 660 s = splnet(); 661 if (IF_QFULL(inq)) { 662 /* Queue overflow. */ 663 IF_DROP(inq); 664 splx(s); 665 if (debug) 666 log(LOG_DEBUG, "%s: protocol queue overflow\n", 667 ifp->if_xname); 668 goto drop; 669 } 670 IF_ENQUEUE(inq, m); 671 splx(s); 672 } 673 674 /* 675 * Enqueue transmit packet. 676 */ 677 static int 678 sppp_output(struct ifnet *ifp, struct mbuf *m, 679 const struct sockaddr *dst, struct rtentry *rt) 680 { 681 struct sppp *sp = (struct sppp *) ifp; 682 struct ppp_header *h = NULL; 683 struct ifqueue *ifq = NULL; /* XXX */ 684 int s, error = 0; 685 uint16_t protocol; 686 ALTQ_DECL(struct altq_pktattr pktattr;) 687 688 s = splnet(); 689 690 sp->pp_last_activity = time_uptime; 691 692 if ((ifp->if_flags & IFF_UP) == 0 || 693 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 694 m_freem(m); 695 splx(s); 696 return (ENETDOWN); 697 } 698 699 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 700 /* 701 * Interface is not yet running, but auto-dial. Need 702 * to start LCP for it. 703 */ 704 ifp->if_flags |= IFF_RUNNING; 705 splx(s); 706 lcp.Open(sp); 707 s = splnet(); 708 } 709 710 /* 711 * If the queueing discipline needs packet classification, 712 * do it before prepending link headers. 713 */ 714 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 715 716 #ifdef INET 717 if (dst->sa_family == AF_INET) { 718 struct ip *ip = NULL; 719 struct tcphdr *th = NULL; 720 721 if (m->m_len >= sizeof(struct ip)) { 722 ip = mtod(m, struct ip *); 723 if (ip->ip_p == IPPROTO_TCP && 724 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 725 sizeof(struct tcphdr)) { 726 th = (struct tcphdr *) 727 ((char *)ip + (ip->ip_hl << 2)); 728 } 729 } else 730 ip = NULL; 731 732 /* 733 * When using dynamic local IP address assignment by using 734 * 0.0.0.0 as a local address, the first TCP session will 735 * not connect because the local TCP checksum is computed 736 * using 0.0.0.0 which will later become our real IP address 737 * so the TCP checksum computed at the remote end will 738 * become invalid. So we 739 * - don't let packets with src ip addr 0 thru 740 * - we flag TCP packets with src ip 0 as an error 741 */ 742 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 743 uint8_t proto = ip->ip_p; 744 745 m_freem(m); 746 splx(s); 747 if (proto == IPPROTO_TCP) 748 return (EADDRNOTAVAIL); 749 else 750 return (0); 751 } 752 753 /* 754 * Put low delay, telnet, rlogin and ftp control packets 755 * in front of the queue. 756 */ 757 758 if (!IF_QFULL(&sp->pp_fastq) && 759 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 760 (th && (INTERACTIVE(ntohs(th->th_sport)) || 761 INTERACTIVE(ntohs(th->th_dport)))))) 762 ifq = &sp->pp_fastq; 763 } 764 #endif 765 766 #ifdef INET6 767 if (dst->sa_family == AF_INET6) { 768 /* XXX do something tricky here? */ 769 } 770 #endif 771 772 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 773 /* 774 * Prepend general data packet PPP header. For now, IP only. 775 */ 776 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 777 if (! m) { 778 if (ifp->if_flags & IFF_DEBUG) 779 log(LOG_DEBUG, "%s: no memory for transmit header\n", 780 ifp->if_xname); 781 ++ifp->if_oerrors; 782 splx(s); 783 return (ENOBUFS); 784 } 785 /* 786 * May want to check size of packet 787 * (albeit due to the implementation it's always enough) 788 */ 789 h = mtod(m, struct ppp_header *); 790 if (sp->pp_flags & PP_CISCO) { 791 h->address = CISCO_UNICAST; /* unicast address */ 792 h->control = 0; 793 } else { 794 h->address = PPP_ALLSTATIONS; /* broadcast address */ 795 h->control = PPP_UI; /* Unnumbered Info */ 796 } 797 } 798 799 switch (dst->sa_family) { 800 #ifdef INET 801 case AF_INET: /* Internet Protocol */ 802 if (sp->pp_flags & PP_CISCO) 803 protocol = htons(ETHERTYPE_IP); 804 else { 805 /* 806 * Don't choke with an ENETDOWN early. It's 807 * possible that we just started dialing out, 808 * so don't drop the packet immediately. If 809 * we notice that we run out of buffer space 810 * below, we will however remember that we are 811 * not ready to carry IP packets, and return 812 * ENETDOWN, as opposed to ENOBUFS. 813 */ 814 protocol = htons(PPP_IP); 815 if (sp->state[IDX_IPCP] != STATE_OPENED) 816 error = ENETDOWN; 817 } 818 break; 819 #endif 820 #ifdef INET6 821 case AF_INET6: /* Internet Protocol version 6 */ 822 if (sp->pp_flags & PP_CISCO) 823 protocol = htons(ETHERTYPE_IPV6); 824 else { 825 /* 826 * Don't choke with an ENETDOWN early. It's 827 * possible that we just started dialing out, 828 * so don't drop the packet immediately. If 829 * we notice that we run out of buffer space 830 * below, we will however remember that we are 831 * not ready to carry IP packets, and return 832 * ENETDOWN, as opposed to ENOBUFS. 833 */ 834 protocol = htons(PPP_IPV6); 835 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 836 error = ENETDOWN; 837 } 838 break; 839 #endif 840 #ifdef IPX 841 case AF_IPX: /* Novell IPX Protocol */ 842 protocol = htons((sp->pp_flags & PP_CISCO) ? 843 ETHERTYPE_IPX : PPP_IPX); 844 break; 845 #endif 846 #ifdef ISO 847 case AF_ISO: /* ISO OSI Protocol */ 848 if (sp->pp_flags & PP_CISCO) 849 goto nosupport; 850 protocol = htons(PPP_ISO); 851 break; 852 nosupport: 853 #endif 854 default: 855 m_freem(m); 856 ++ifp->if_oerrors; 857 splx(s); 858 return (EAFNOSUPPORT); 859 } 860 861 if (sp->pp_flags & PP_NOFRAMING) { 862 M_PREPEND(m, 2, M_DONTWAIT); 863 if (m == NULL) { 864 if (ifp->if_flags & IFF_DEBUG) 865 log(LOG_DEBUG, "%s: no memory for transmit header\n", 866 ifp->if_xname); 867 ++ifp->if_oerrors; 868 splx(s); 869 return (ENOBUFS); 870 } 871 *mtod(m, uint16_t *) = protocol; 872 } else { 873 h->protocol = protocol; 874 } 875 876 877 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 878 879 if (error == 0) { 880 /* 881 * Count output packets and bytes. 882 * The packet length includes header + additional hardware 883 * framing according to RFC 1333. 884 */ 885 if (!(ifp->if_flags & IFF_OACTIVE)) 886 (*ifp->if_start)(ifp); 887 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 888 } 889 splx(s); 890 return error; 891 } 892 893 void 894 sppp_attach(struct ifnet *ifp) 895 { 896 struct sppp *sp = (struct sppp *) ifp; 897 898 /* Initialize keepalive handler. */ 899 if (! spppq) { 900 callout_init(&keepalive_ch, 0); 901 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 902 } 903 904 /* Insert new entry into the keepalive list. */ 905 sp->pp_next = spppq; 906 spppq = sp; 907 908 sp->pp_if.if_type = IFT_PPP; 909 sp->pp_if.if_output = sppp_output; 910 sp->pp_fastq.ifq_maxlen = 32; 911 sp->pp_cpq.ifq_maxlen = 20; 912 sp->pp_loopcnt = 0; 913 sp->pp_alivecnt = 0; 914 sp->pp_last_activity = 0; 915 sp->pp_last_receive = 0; 916 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 917 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 918 sp->pp_idle_timeout = 0; 919 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 920 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 921 sp->pp_auth_failures = 0; 922 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 923 sp->pp_phase = SPPP_PHASE_DEAD; 924 sp->pp_up = lcp.Up; 925 sp->pp_down = lcp.Down; 926 927 if_alloc_sadl(ifp); 928 929 memset(&sp->myauth, 0, sizeof sp->myauth); 930 memset(&sp->hisauth, 0, sizeof sp->hisauth); 931 sppp_lcp_init(sp); 932 sppp_ipcp_init(sp); 933 sppp_ipv6cp_init(sp); 934 sppp_pap_init(sp); 935 sppp_chap_init(sp); 936 } 937 938 void 939 sppp_detach(struct ifnet *ifp) 940 { 941 struct sppp **q, *p, *sp = (struct sppp *) ifp; 942 943 /* Remove the entry from the keepalive list. */ 944 for (q = &spppq; (p = *q); q = &p->pp_next) 945 if (p == sp) { 946 *q = p->pp_next; 947 break; 948 } 949 950 /* Stop keepalive handler. */ 951 if (! spppq) { 952 callout_stop(&keepalive_ch); 953 } 954 955 callout_stop(&sp->ch[IDX_LCP]); 956 callout_stop(&sp->ch[IDX_IPCP]); 957 callout_stop(&sp->ch[IDX_PAP]); 958 callout_stop(&sp->ch[IDX_CHAP]); 959 #ifdef INET6 960 callout_stop(&sp->ch[IDX_IPV6CP]); 961 #endif 962 callout_stop(&sp->pap_my_to_ch); 963 964 /* free authentication info */ 965 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 966 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 967 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 968 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 969 970 #if 0 /* done in if_detach() */ 971 if_free_sadl(ifp); 972 #endif 973 } 974 975 /* 976 * Flush the interface output queue. 977 */ 978 void 979 sppp_flush(struct ifnet *ifp) 980 { 981 struct sppp *sp = (struct sppp *) ifp; 982 983 IFQ_PURGE(&sp->pp_if.if_snd); 984 IF_PURGE(&sp->pp_fastq); 985 IF_PURGE(&sp->pp_cpq); 986 } 987 988 /* 989 * Check if the output queue is empty. 990 */ 991 int 992 sppp_isempty(struct ifnet *ifp) 993 { 994 struct sppp *sp = (struct sppp *) ifp; 995 int empty, s; 996 997 s = splnet(); 998 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 999 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1000 splx(s); 1001 return (empty); 1002 } 1003 1004 /* 1005 * Get next packet to send. 1006 */ 1007 struct mbuf * 1008 sppp_dequeue(struct ifnet *ifp) 1009 { 1010 struct sppp *sp = (struct sppp *) ifp; 1011 struct mbuf *m; 1012 int s; 1013 1014 s = splnet(); 1015 /* 1016 * Process only the control protocol queue until we have at 1017 * least one NCP open. 1018 * 1019 * Do always serve all three queues in Cisco mode. 1020 */ 1021 IF_DEQUEUE(&sp->pp_cpq, m); 1022 if (m == NULL && 1023 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1024 IF_DEQUEUE(&sp->pp_fastq, m); 1025 if (m == NULL) 1026 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1027 } 1028 splx(s); 1029 return m; 1030 } 1031 1032 /* 1033 * Process an ioctl request. Called on low priority level. 1034 */ 1035 int 1036 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1037 { 1038 struct lwp *l = curlwp; /* XXX */ 1039 struct ifreq *ifr = (struct ifreq *) data; 1040 struct sppp *sp = (struct sppp *) ifp; 1041 int s, error=0, going_up, going_down, newmode; 1042 1043 s = splnet(); 1044 switch (cmd) { 1045 case SIOCAIFADDR: 1046 case SIOCSIFDSTADDR: 1047 case SIOCINITIFADDR: 1048 break; 1049 1050 case SIOCSIFFLAGS: 1051 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1052 break; 1053 going_up = ifp->if_flags & IFF_UP && 1054 (ifp->if_flags & IFF_RUNNING) == 0; 1055 going_down = (ifp->if_flags & IFF_UP) == 0 && 1056 ifp->if_flags & IFF_RUNNING; 1057 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1058 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1059 /* sanity */ 1060 newmode = IFF_PASSIVE; 1061 ifp->if_flags &= ~IFF_AUTO; 1062 } 1063 1064 if (going_up || going_down) 1065 lcp.Close(sp); 1066 if (going_up && newmode == 0) { 1067 /* neither auto-dial nor passive */ 1068 ifp->if_flags |= IFF_RUNNING; 1069 if (!(sp->pp_flags & PP_CISCO)) 1070 lcp.Open(sp); 1071 } else if (going_down) { 1072 sppp_flush(ifp); 1073 ifp->if_flags &= ~IFF_RUNNING; 1074 } 1075 1076 break; 1077 1078 case SIOCSIFMTU: 1079 if (ifr->ifr_mtu < PPP_MINMRU || 1080 ifr->ifr_mtu > sp->lcp.their_mru) { 1081 error = EINVAL; 1082 break; 1083 } 1084 /*FALLTHROUGH*/ 1085 case SIOCGIFMTU: 1086 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1087 error = 0; 1088 break; 1089 case SIOCADDMULTI: 1090 case SIOCDELMULTI: 1091 break; 1092 1093 case SPPPSETAUTHCFG: 1094 case SPPPSETLCPCFG: 1095 case SPPPSETIDLETO: 1096 case SPPPSETAUTHFAILURE: 1097 case SPPPSETDNSOPTS: 1098 case SPPPSETKEEPALIVE: 1099 error = kauth_authorize_network(l->l_cred, 1100 KAUTH_NETWORK_INTERFACE, 1101 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1102 NULL); 1103 if (error) 1104 break; 1105 error = sppp_params(sp, cmd, data); 1106 break; 1107 1108 case SPPPGETAUTHCFG: 1109 case SPPPGETLCPCFG: 1110 case SPPPGETAUTHFAILURES: 1111 error = kauth_authorize_network(l->l_cred, 1112 KAUTH_NETWORK_INTERFACE, 1113 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1114 NULL); 1115 if (error) 1116 break; 1117 error = sppp_params(sp, cmd, data); 1118 break; 1119 1120 case SPPPGETSTATUS: 1121 case SPPPGETSTATUSNCP: 1122 case SPPPGETIDLETO: 1123 case SPPPGETDNSOPTS: 1124 case SPPPGETDNSADDRS: 1125 case SPPPGETKEEPALIVE: 1126 error = sppp_params(sp, cmd, data); 1127 break; 1128 1129 default: 1130 error = ifioctl_common(ifp, cmd, data); 1131 break; 1132 } 1133 splx(s); 1134 return (error); 1135 } 1136 1137 1138 /* 1139 * Cisco framing implementation. 1140 */ 1141 1142 /* 1143 * Handle incoming Cisco keepalive protocol packets. 1144 */ 1145 static void 1146 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1147 { 1148 STDDCL; 1149 struct cisco_packet *h; 1150 #ifdef INET 1151 uint32_t me, mymask = 0; /* XXX: GCC */ 1152 #endif 1153 1154 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1155 if (debug) 1156 log(LOG_DEBUG, 1157 "%s: cisco invalid packet length: %d bytes\n", 1158 ifp->if_xname, m->m_pkthdr.len); 1159 return; 1160 } 1161 h = mtod(m, struct cisco_packet *); 1162 if (debug) 1163 log(LOG_DEBUG, 1164 "%s: cisco input: %d bytes " 1165 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1166 ifp->if_xname, m->m_pkthdr.len, 1167 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1168 (u_int)h->time0, (u_int)h->time1); 1169 switch (ntohl(h->type)) { 1170 default: 1171 if (debug) 1172 addlog("%s: cisco unknown packet type: 0x%x\n", 1173 ifp->if_xname, ntohl(h->type)); 1174 break; 1175 case CISCO_ADDR_REPLY: 1176 /* Reply on address request, ignore */ 1177 break; 1178 case CISCO_KEEPALIVE_REQ: 1179 sp->pp_alivecnt = 0; 1180 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1181 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1182 /* Local and remote sequence numbers are equal. 1183 * Probably, the line is in loopback mode. */ 1184 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1185 printf ("%s: loopback\n", 1186 ifp->if_xname); 1187 sp->pp_loopcnt = 0; 1188 if (ifp->if_flags & IFF_UP) { 1189 if_down(ifp); 1190 IF_PURGE(&sp->pp_cpq); 1191 } 1192 } 1193 ++sp->pp_loopcnt; 1194 1195 /* Generate new local sequence number */ 1196 sp->pp_seq[IDX_LCP] = arc4random(); 1197 break; 1198 } 1199 sp->pp_loopcnt = 0; 1200 if (! (ifp->if_flags & IFF_UP) && 1201 (ifp->if_flags & IFF_RUNNING)) { 1202 if_up(ifp); 1203 } 1204 break; 1205 case CISCO_ADDR_REQ: 1206 #ifdef INET 1207 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1208 if (me != 0L) 1209 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1210 #endif 1211 break; 1212 } 1213 } 1214 1215 /* 1216 * Send Cisco keepalive packet. 1217 */ 1218 static void 1219 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1220 { 1221 STDDCL; 1222 struct ppp_header *h; 1223 struct cisco_packet *ch; 1224 struct mbuf *m; 1225 uint32_t t; 1226 1227 t = time_uptime * 1000; 1228 MGETHDR(m, M_DONTWAIT, MT_DATA); 1229 if (! m) 1230 return; 1231 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1232 m->m_pkthdr.rcvif = 0; 1233 1234 h = mtod(m, struct ppp_header *); 1235 h->address = CISCO_MULTICAST; 1236 h->control = 0; 1237 h->protocol = htons(CISCO_KEEPALIVE); 1238 1239 ch = (struct cisco_packet *)(h + 1); 1240 ch->type = htonl(type); 1241 ch->par1 = htonl(par1); 1242 ch->par2 = htonl(par2); 1243 ch->rel = -1; 1244 1245 ch->time0 = htons((u_short)(t >> 16)); 1246 ch->time1 = htons((u_short) t); 1247 1248 if (debug) 1249 log(LOG_DEBUG, 1250 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1251 ifp->if_xname, ntohl(ch->type), ch->par1, 1252 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1253 (u_int)ch->time1); 1254 1255 if (IF_QFULL(&sp->pp_cpq)) { 1256 IF_DROP(&sp->pp_fastq); 1257 IF_DROP(&ifp->if_snd); 1258 m_freem(m); 1259 ++ifp->if_oerrors; 1260 return; 1261 } else 1262 IF_ENQUEUE(&sp->pp_cpq, m); 1263 if (! (ifp->if_flags & IFF_OACTIVE)) 1264 (*ifp->if_start)(ifp); 1265 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1266 } 1267 1268 /* 1269 * PPP protocol implementation. 1270 */ 1271 1272 /* 1273 * Send PPP control protocol packet. 1274 */ 1275 static void 1276 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1277 u_char ident, u_short len, void *data) 1278 { 1279 STDDCL; 1280 struct lcp_header *lh; 1281 struct mbuf *m; 1282 size_t pkthdrlen; 1283 1284 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1285 1286 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1287 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1288 MGETHDR(m, M_DONTWAIT, MT_DATA); 1289 if (! m) 1290 return; 1291 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1292 m->m_pkthdr.rcvif = 0; 1293 1294 if (sp->pp_flags & PP_NOFRAMING) { 1295 *mtod(m, uint16_t *) = htons(proto); 1296 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1297 } else { 1298 struct ppp_header *h; 1299 h = mtod(m, struct ppp_header *); 1300 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1301 h->control = PPP_UI; /* Unnumbered Info */ 1302 h->protocol = htons(proto); /* Link Control Protocol */ 1303 lh = (struct lcp_header *)(h + 1); 1304 } 1305 lh->type = type; 1306 lh->ident = ident; 1307 lh->len = htons(LCP_HEADER_LEN + len); 1308 if (len) 1309 bcopy (data, lh + 1, len); 1310 1311 if (debug) { 1312 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1313 ifp->if_xname, 1314 sppp_proto_name(proto), 1315 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1316 if (len) 1317 sppp_print_bytes((u_char *)(lh + 1), len); 1318 addlog(">\n"); 1319 } 1320 if (IF_QFULL(&sp->pp_cpq)) { 1321 IF_DROP(&sp->pp_fastq); 1322 IF_DROP(&ifp->if_snd); 1323 m_freem(m); 1324 ++ifp->if_oerrors; 1325 return; 1326 } else 1327 IF_ENQUEUE(&sp->pp_cpq, m); 1328 if (! (ifp->if_flags & IFF_OACTIVE)) 1329 (*ifp->if_start)(ifp); 1330 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1331 } 1332 1333 /* 1334 * Handle incoming PPP control protocol packets. 1335 */ 1336 static void 1337 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1338 { 1339 STDDCL; 1340 struct lcp_header *h; 1341 int printlen, len = m->m_pkthdr.len; 1342 int rv; 1343 u_char *p; 1344 uint32_t u32; 1345 1346 if (len < 4) { 1347 if (debug) 1348 log(LOG_DEBUG, 1349 "%s: %s invalid packet length: %d bytes\n", 1350 ifp->if_xname, cp->name, len); 1351 return; 1352 } 1353 h = mtod(m, struct lcp_header *); 1354 if (debug) { 1355 printlen = ntohs(h->len); 1356 log(LOG_DEBUG, 1357 "%s: %s input(%s): <%s id=0x%x len=%d", 1358 ifp->if_xname, cp->name, 1359 sppp_state_name(sp->state[cp->protoidx]), 1360 sppp_cp_type_name(h->type), h->ident, printlen); 1361 if (len < printlen) 1362 printlen = len; 1363 if (printlen > 4) 1364 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1365 addlog(">\n"); 1366 } 1367 if (len > ntohs(h->len)) 1368 len = ntohs(h->len); 1369 p = (u_char *)(h + 1); 1370 switch (h->type) { 1371 case CONF_REQ: 1372 if (len < 4) { 1373 if (debug) 1374 addlog("%s: %s invalid conf-req length %d\n", 1375 ifp->if_xname, cp->name, 1376 len); 1377 ++ifp->if_ierrors; 1378 break; 1379 } 1380 /* handle states where RCR doesn't get a SCA/SCN */ 1381 switch (sp->state[cp->protoidx]) { 1382 case STATE_CLOSING: 1383 case STATE_STOPPING: 1384 return; 1385 case STATE_CLOSED: 1386 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1387 0, 0); 1388 return; 1389 } 1390 rv = (cp->RCR)(sp, h, len); 1391 if (rv < 0) { 1392 /* fatal error, shut down */ 1393 (cp->tld)(sp); 1394 sppp_lcp_tlf(sp); 1395 return; 1396 } 1397 switch (sp->state[cp->protoidx]) { 1398 case STATE_OPENED: 1399 (cp->tld)(sp); 1400 (cp->scr)(sp); 1401 /* fall through... */ 1402 case STATE_ACK_SENT: 1403 case STATE_REQ_SENT: 1404 sppp_cp_change_state(cp, sp, rv? 1405 STATE_ACK_SENT: STATE_REQ_SENT); 1406 break; 1407 case STATE_STOPPED: 1408 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1409 (cp->scr)(sp); 1410 sppp_cp_change_state(cp, sp, rv? 1411 STATE_ACK_SENT: STATE_REQ_SENT); 1412 break; 1413 case STATE_ACK_RCVD: 1414 if (rv) { 1415 sppp_cp_change_state(cp, sp, STATE_OPENED); 1416 if (debug) 1417 log(LOG_DEBUG, "%s: %s tlu\n", 1418 ifp->if_xname, 1419 cp->name); 1420 (cp->tlu)(sp); 1421 } else 1422 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1423 break; 1424 default: 1425 printf("%s: %s illegal %s in state %s\n", 1426 ifp->if_xname, cp->name, 1427 sppp_cp_type_name(h->type), 1428 sppp_state_name(sp->state[cp->protoidx])); 1429 ++ifp->if_ierrors; 1430 } 1431 break; 1432 case CONF_ACK: 1433 if (h->ident != sp->confid[cp->protoidx]) { 1434 if (debug) 1435 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1436 ifp->if_xname, cp->name, 1437 h->ident, sp->confid[cp->protoidx]); 1438 ++ifp->if_ierrors; 1439 break; 1440 } 1441 switch (sp->state[cp->protoidx]) { 1442 case STATE_CLOSED: 1443 case STATE_STOPPED: 1444 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1445 break; 1446 case STATE_CLOSING: 1447 case STATE_STOPPING: 1448 break; 1449 case STATE_REQ_SENT: 1450 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1451 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1452 break; 1453 case STATE_OPENED: 1454 (cp->tld)(sp); 1455 /* fall through */ 1456 case STATE_ACK_RCVD: 1457 (cp->scr)(sp); 1458 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1459 break; 1460 case STATE_ACK_SENT: 1461 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1462 sppp_cp_change_state(cp, sp, STATE_OPENED); 1463 if (debug) 1464 log(LOG_DEBUG, "%s: %s tlu\n", 1465 ifp->if_xname, cp->name); 1466 (cp->tlu)(sp); 1467 break; 1468 default: 1469 printf("%s: %s illegal %s in state %s\n", 1470 ifp->if_xname, cp->name, 1471 sppp_cp_type_name(h->type), 1472 sppp_state_name(sp->state[cp->protoidx])); 1473 ++ifp->if_ierrors; 1474 } 1475 break; 1476 case CONF_NAK: 1477 case CONF_REJ: 1478 if (h->ident != sp->confid[cp->protoidx]) { 1479 if (debug) 1480 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1481 ifp->if_xname, cp->name, 1482 h->ident, sp->confid[cp->protoidx]); 1483 ++ifp->if_ierrors; 1484 break; 1485 } 1486 if (h->type == CONF_NAK) 1487 (cp->RCN_nak)(sp, h, len); 1488 else /* CONF_REJ */ 1489 (cp->RCN_rej)(sp, h, len); 1490 1491 switch (sp->state[cp->protoidx]) { 1492 case STATE_CLOSED: 1493 case STATE_STOPPED: 1494 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1495 break; 1496 case STATE_REQ_SENT: 1497 case STATE_ACK_SENT: 1498 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1499 (cp->scr)(sp); 1500 break; 1501 case STATE_OPENED: 1502 (cp->tld)(sp); 1503 /* fall through */ 1504 case STATE_ACK_RCVD: 1505 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1506 (cp->scr)(sp); 1507 break; 1508 case STATE_CLOSING: 1509 case STATE_STOPPING: 1510 break; 1511 default: 1512 printf("%s: %s illegal %s in state %s\n", 1513 ifp->if_xname, cp->name, 1514 sppp_cp_type_name(h->type), 1515 sppp_state_name(sp->state[cp->protoidx])); 1516 ++ifp->if_ierrors; 1517 } 1518 break; 1519 1520 case TERM_REQ: 1521 switch (sp->state[cp->protoidx]) { 1522 case STATE_ACK_RCVD: 1523 case STATE_ACK_SENT: 1524 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1525 /* fall through */ 1526 case STATE_CLOSED: 1527 case STATE_STOPPED: 1528 case STATE_CLOSING: 1529 case STATE_STOPPING: 1530 case STATE_REQ_SENT: 1531 sta: 1532 /* Send Terminate-Ack packet. */ 1533 if (debug) 1534 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1535 ifp->if_xname, cp->name); 1536 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1537 break; 1538 case STATE_OPENED: 1539 (cp->tld)(sp); 1540 sp->rst_counter[cp->protoidx] = 0; 1541 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1542 goto sta; 1543 default: 1544 printf("%s: %s illegal %s in state %s\n", 1545 ifp->if_xname, cp->name, 1546 sppp_cp_type_name(h->type), 1547 sppp_state_name(sp->state[cp->protoidx])); 1548 ++ifp->if_ierrors; 1549 } 1550 break; 1551 case TERM_ACK: 1552 switch (sp->state[cp->protoidx]) { 1553 case STATE_CLOSED: 1554 case STATE_STOPPED: 1555 case STATE_REQ_SENT: 1556 case STATE_ACK_SENT: 1557 break; 1558 case STATE_CLOSING: 1559 (cp->tlf)(sp); 1560 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1561 sppp_lcp_check_and_close(sp); 1562 break; 1563 case STATE_STOPPING: 1564 (cp->tlf)(sp); 1565 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1566 sppp_lcp_check_and_close(sp); 1567 break; 1568 case STATE_ACK_RCVD: 1569 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1570 break; 1571 case STATE_OPENED: 1572 (cp->tld)(sp); 1573 (cp->scr)(sp); 1574 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1575 break; 1576 default: 1577 printf("%s: %s illegal %s in state %s\n", 1578 ifp->if_xname, cp->name, 1579 sppp_cp_type_name(h->type), 1580 sppp_state_name(sp->state[cp->protoidx])); 1581 ++ifp->if_ierrors; 1582 } 1583 break; 1584 case CODE_REJ: 1585 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1586 log(LOG_INFO, 1587 "%s: %s: ignoring RXJ (%s) for code ?, " 1588 "danger will robinson\n", 1589 ifp->if_xname, cp->name, 1590 sppp_cp_type_name(h->type)); 1591 switch (sp->state[cp->protoidx]) { 1592 case STATE_CLOSED: 1593 case STATE_STOPPED: 1594 case STATE_REQ_SENT: 1595 case STATE_ACK_SENT: 1596 case STATE_CLOSING: 1597 case STATE_STOPPING: 1598 case STATE_OPENED: 1599 break; 1600 case STATE_ACK_RCVD: 1601 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1602 break; 1603 default: 1604 printf("%s: %s illegal %s in state %s\n", 1605 ifp->if_xname, cp->name, 1606 sppp_cp_type_name(h->type), 1607 sppp_state_name(sp->state[cp->protoidx])); 1608 ++ifp->if_ierrors; 1609 } 1610 break; 1611 case PROTO_REJ: 1612 { 1613 int catastrophic; 1614 const struct cp *upper; 1615 int i; 1616 uint16_t proto; 1617 1618 catastrophic = 0; 1619 upper = NULL; 1620 proto = p[0] << 8 | p[1]; 1621 for (i = 0; i < IDX_COUNT; i++) { 1622 if (cps[i]->proto == proto) { 1623 upper = cps[i]; 1624 break; 1625 } 1626 } 1627 if (upper == NULL) 1628 catastrophic++; 1629 1630 if (debug) 1631 log(LOG_INFO, 1632 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1633 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1634 sppp_cp_type_name(h->type), proto, 1635 upper ? upper->name : "unknown", 1636 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1637 1638 /* 1639 * if we got RXJ+ against conf-req, the peer does not implement 1640 * this particular protocol type. terminate the protocol. 1641 */ 1642 if (upper && !catastrophic) { 1643 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1644 upper->Close(sp); 1645 break; 1646 } 1647 } 1648 1649 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1650 switch (sp->state[cp->protoidx]) { 1651 case STATE_CLOSED: 1652 case STATE_STOPPED: 1653 case STATE_REQ_SENT: 1654 case STATE_ACK_SENT: 1655 case STATE_CLOSING: 1656 case STATE_STOPPING: 1657 case STATE_OPENED: 1658 break; 1659 case STATE_ACK_RCVD: 1660 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1661 break; 1662 default: 1663 printf("%s: %s illegal %s in state %s\n", 1664 ifp->if_xname, cp->name, 1665 sppp_cp_type_name(h->type), 1666 sppp_state_name(sp->state[cp->protoidx])); 1667 ++ifp->if_ierrors; 1668 } 1669 break; 1670 } 1671 case DISC_REQ: 1672 if (cp->proto != PPP_LCP) 1673 goto illegal; 1674 /* Discard the packet. */ 1675 break; 1676 case ECHO_REQ: 1677 if (cp->proto != PPP_LCP) 1678 goto illegal; 1679 if (sp->state[cp->protoidx] != STATE_OPENED) { 1680 if (debug) 1681 addlog("%s: lcp echo req but lcp closed\n", 1682 ifp->if_xname); 1683 ++ifp->if_ierrors; 1684 break; 1685 } 1686 if (len < 8) { 1687 if (debug) 1688 addlog("%s: invalid lcp echo request " 1689 "packet length: %d bytes\n", 1690 ifp->if_xname, len); 1691 break; 1692 } 1693 memcpy(&u32, h + 1, sizeof u32); 1694 if (ntohl(u32) == sp->lcp.magic) { 1695 /* Line loopback mode detected. */ 1696 printf("%s: loopback\n", ifp->if_xname); 1697 if_down(ifp); 1698 IF_PURGE(&sp->pp_cpq); 1699 1700 /* Shut down the PPP link. */ 1701 /* XXX */ 1702 lcp.Down(sp); 1703 lcp.Up(sp); 1704 break; 1705 } 1706 u32 = htonl(sp->lcp.magic); 1707 memcpy(h + 1, &u32, sizeof u32); 1708 if (debug) 1709 addlog("%s: got lcp echo req, sending echo rep\n", 1710 ifp->if_xname); 1711 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1712 h + 1); 1713 break; 1714 case ECHO_REPLY: 1715 if (cp->proto != PPP_LCP) 1716 goto illegal; 1717 if (h->ident != sp->lcp.echoid) { 1718 ++ifp->if_ierrors; 1719 break; 1720 } 1721 if (len < 8) { 1722 if (debug) 1723 addlog("%s: lcp invalid echo reply " 1724 "packet length: %d bytes\n", 1725 ifp->if_xname, len); 1726 break; 1727 } 1728 if (debug) 1729 addlog("%s: lcp got echo rep\n", 1730 ifp->if_xname); 1731 memcpy(&u32, h + 1, sizeof u32); 1732 if (ntohl(u32) != sp->lcp.magic) 1733 sp->pp_alivecnt = 0; 1734 break; 1735 default: 1736 /* Unknown packet type -- send Code-Reject packet. */ 1737 illegal: 1738 if (debug) 1739 addlog("%s: %s send code-rej for 0x%x\n", 1740 ifp->if_xname, cp->name, h->type); 1741 sppp_cp_send(sp, cp->proto, CODE_REJ, 1742 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1743 ++ifp->if_ierrors; 1744 } 1745 } 1746 1747 1748 /* 1749 * The generic part of all Up/Down/Open/Close/TO event handlers. 1750 * Basically, the state transition handling in the automaton. 1751 */ 1752 static void 1753 sppp_up_event(const struct cp *cp, struct sppp *sp) 1754 { 1755 STDDCL; 1756 1757 if (debug) 1758 log(LOG_DEBUG, "%s: %s up(%s)\n", 1759 ifp->if_xname, cp->name, 1760 sppp_state_name(sp->state[cp->protoidx])); 1761 1762 switch (sp->state[cp->protoidx]) { 1763 case STATE_INITIAL: 1764 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1765 break; 1766 case STATE_STARTING: 1767 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1768 (cp->scr)(sp); 1769 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1770 break; 1771 default: 1772 printf("%s: %s illegal up in state %s\n", 1773 ifp->if_xname, cp->name, 1774 sppp_state_name(sp->state[cp->protoidx])); 1775 } 1776 } 1777 1778 static void 1779 sppp_down_event(const struct cp *cp, struct sppp *sp) 1780 { 1781 STDDCL; 1782 1783 if (debug) 1784 log(LOG_DEBUG, "%s: %s down(%s)\n", 1785 ifp->if_xname, cp->name, 1786 sppp_state_name(sp->state[cp->protoidx])); 1787 1788 switch (sp->state[cp->protoidx]) { 1789 case STATE_CLOSED: 1790 case STATE_CLOSING: 1791 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1792 break; 1793 case STATE_STOPPED: 1794 (cp->tls)(sp); 1795 /* fall through */ 1796 case STATE_STOPPING: 1797 case STATE_REQ_SENT: 1798 case STATE_ACK_RCVD: 1799 case STATE_ACK_SENT: 1800 sppp_cp_change_state(cp, sp, STATE_STARTING); 1801 break; 1802 case STATE_OPENED: 1803 (cp->tld)(sp); 1804 sppp_cp_change_state(cp, sp, STATE_STARTING); 1805 break; 1806 default: 1807 printf("%s: %s illegal down in state %s\n", 1808 ifp->if_xname, cp->name, 1809 sppp_state_name(sp->state[cp->protoidx])); 1810 } 1811 } 1812 1813 1814 static void 1815 sppp_open_event(const struct cp *cp, struct sppp *sp) 1816 { 1817 STDDCL; 1818 1819 if (debug) 1820 log(LOG_DEBUG, "%s: %s open(%s)\n", 1821 ifp->if_xname, cp->name, 1822 sppp_state_name(sp->state[cp->protoidx])); 1823 1824 switch (sp->state[cp->protoidx]) { 1825 case STATE_INITIAL: 1826 sppp_cp_change_state(cp, sp, STATE_STARTING); 1827 (cp->tls)(sp); 1828 break; 1829 case STATE_STARTING: 1830 break; 1831 case STATE_CLOSED: 1832 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1833 (cp->scr)(sp); 1834 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1835 break; 1836 case STATE_STOPPED: 1837 case STATE_STOPPING: 1838 case STATE_REQ_SENT: 1839 case STATE_ACK_RCVD: 1840 case STATE_ACK_SENT: 1841 case STATE_OPENED: 1842 break; 1843 case STATE_CLOSING: 1844 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1845 break; 1846 } 1847 } 1848 1849 1850 static void 1851 sppp_close_event(const struct cp *cp, struct sppp *sp) 1852 { 1853 STDDCL; 1854 1855 if (debug) 1856 log(LOG_DEBUG, "%s: %s close(%s)\n", 1857 ifp->if_xname, cp->name, 1858 sppp_state_name(sp->state[cp->protoidx])); 1859 1860 switch (sp->state[cp->protoidx]) { 1861 case STATE_INITIAL: 1862 case STATE_CLOSED: 1863 case STATE_CLOSING: 1864 break; 1865 case STATE_STARTING: 1866 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1867 (cp->tlf)(sp); 1868 break; 1869 case STATE_STOPPED: 1870 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1871 break; 1872 case STATE_STOPPING: 1873 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1874 break; 1875 case STATE_OPENED: 1876 (cp->tld)(sp); 1877 /* fall through */ 1878 case STATE_REQ_SENT: 1879 case STATE_ACK_RCVD: 1880 case STATE_ACK_SENT: 1881 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1882 sppp_cp_send(sp, cp->proto, TERM_REQ, 1883 ++sp->pp_seq[cp->protoidx], 0, 0); 1884 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1885 break; 1886 } 1887 } 1888 1889 static void 1890 sppp_to_event(const struct cp *cp, struct sppp *sp) 1891 { 1892 STDDCL; 1893 int s; 1894 1895 s = splnet(); 1896 if (debug) 1897 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1898 ifp->if_xname, cp->name, 1899 sppp_state_name(sp->state[cp->protoidx]), 1900 sp->rst_counter[cp->protoidx]); 1901 1902 if (--sp->rst_counter[cp->protoidx] < 0) 1903 /* TO- event */ 1904 switch (sp->state[cp->protoidx]) { 1905 case STATE_CLOSING: 1906 (cp->tlf)(sp); 1907 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1908 sppp_lcp_check_and_close(sp); 1909 break; 1910 case STATE_STOPPING: 1911 (cp->tlf)(sp); 1912 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1913 sppp_lcp_check_and_close(sp); 1914 break; 1915 case STATE_REQ_SENT: 1916 case STATE_ACK_RCVD: 1917 case STATE_ACK_SENT: 1918 (cp->tlf)(sp); 1919 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1920 sppp_lcp_check_and_close(sp); 1921 break; 1922 } 1923 else 1924 /* TO+ event */ 1925 switch (sp->state[cp->protoidx]) { 1926 case STATE_CLOSING: 1927 case STATE_STOPPING: 1928 sppp_cp_send(sp, cp->proto, TERM_REQ, 1929 ++sp->pp_seq[cp->protoidx], 0, 0); 1930 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1931 cp->TO, sp); 1932 break; 1933 case STATE_REQ_SENT: 1934 case STATE_ACK_RCVD: 1935 (cp->scr)(sp); 1936 /* sppp_cp_change_state() will restart the timer */ 1937 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1938 break; 1939 case STATE_ACK_SENT: 1940 (cp->scr)(sp); 1941 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1942 cp->TO, sp); 1943 break; 1944 } 1945 1946 splx(s); 1947 } 1948 1949 /* 1950 * Change the state of a control protocol in the state automaton. 1951 * Takes care of starting/stopping the restart timer. 1952 */ 1953 void 1954 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1955 { 1956 sp->state[cp->protoidx] = newstate; 1957 callout_stop(&sp->ch[cp->protoidx]); 1958 switch (newstate) { 1959 case STATE_INITIAL: 1960 case STATE_STARTING: 1961 case STATE_CLOSED: 1962 case STATE_STOPPED: 1963 case STATE_OPENED: 1964 break; 1965 case STATE_CLOSING: 1966 case STATE_STOPPING: 1967 case STATE_REQ_SENT: 1968 case STATE_ACK_RCVD: 1969 case STATE_ACK_SENT: 1970 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1971 cp->TO, sp); 1972 break; 1973 } 1974 } 1975 1976 /* 1977 *--------------------------------------------------------------------------* 1978 * * 1979 * The LCP implementation. * 1980 * * 1981 *--------------------------------------------------------------------------* 1982 */ 1983 static void 1984 sppp_lcp_init(struct sppp *sp) 1985 { 1986 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1987 sp->lcp.magic = 0; 1988 sp->state[IDX_LCP] = STATE_INITIAL; 1989 sp->fail_counter[IDX_LCP] = 0; 1990 sp->pp_seq[IDX_LCP] = 0; 1991 sp->pp_rseq[IDX_LCP] = 0; 1992 sp->lcp.protos = 0; 1993 if (sp->pp_if.if_mtu < PP_MTU) { 1994 sp->lcp.mru = sp->pp_if.if_mtu; 1995 sp->lcp.opts |= (1 << LCP_OPT_MRU); 1996 } else 1997 sp->lcp.mru = PP_MTU; 1998 sp->lcp.their_mru = PP_MTU; 1999 2000 /* 2001 * Initialize counters and timeout values. Note that we don't 2002 * use the 3 seconds suggested in RFC 1661 since we are likely 2003 * running on a fast link. XXX We should probably implement 2004 * the exponential backoff option. Note that these values are 2005 * relevant for all control protocols, not just LCP only. 2006 */ 2007 sp->lcp.timeout = 1 * hz; 2008 sp->lcp.max_terminate = 2; 2009 sp->lcp.max_configure = 10; 2010 sp->lcp.max_failure = 10; 2011 callout_init(&sp->ch[IDX_LCP], 0); 2012 } 2013 2014 static void 2015 sppp_lcp_up(struct sppp *sp) 2016 { 2017 STDDCL; 2018 2019 /* Initialize activity timestamp: opening a connection is an activity */ 2020 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2021 2022 /* 2023 * If this interface is passive or dial-on-demand, and we are 2024 * still in Initial state, it means we've got an incoming 2025 * call. Activate the interface. 2026 */ 2027 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2028 if (debug) 2029 log(LOG_DEBUG, 2030 "%s: Up event", ifp->if_xname); 2031 ifp->if_flags |= IFF_RUNNING; 2032 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2033 if (debug) 2034 addlog("(incoming call)\n"); 2035 sp->pp_flags |= PP_CALLIN; 2036 lcp.Open(sp); 2037 } else if (debug) 2038 addlog("\n"); 2039 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2040 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2041 ifp->if_flags |= IFF_RUNNING; 2042 lcp.Open(sp); 2043 } 2044 2045 sppp_up_event(&lcp, sp); 2046 } 2047 2048 static void 2049 sppp_lcp_down(struct sppp *sp) 2050 { 2051 STDDCL; 2052 2053 sppp_down_event(&lcp, sp); 2054 2055 /* 2056 * If this is neither a dial-on-demand nor a passive 2057 * interface, simulate an ``ifconfig down'' action, so the 2058 * administrator can force a redial by another ``ifconfig 2059 * up''. XXX For leased line operation, should we immediately 2060 * try to reopen the connection here? 2061 */ 2062 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2063 if (debug) 2064 log(LOG_INFO, 2065 "%s: Down event (carrier loss), taking interface down.\n", 2066 ifp->if_xname); 2067 if_down(ifp); 2068 } else { 2069 if (debug) 2070 log(LOG_DEBUG, 2071 "%s: Down event (carrier loss)\n", 2072 ifp->if_xname); 2073 } 2074 sp->pp_flags &= ~PP_CALLIN; 2075 if (sp->state[IDX_LCP] != STATE_INITIAL) 2076 lcp.Close(sp); 2077 ifp->if_flags &= ~IFF_RUNNING; 2078 } 2079 2080 static void 2081 sppp_lcp_open(struct sppp *sp) 2082 { 2083 /* 2084 * If we are authenticator, negotiate LCP_AUTH 2085 */ 2086 if (sp->hisauth.proto != 0) 2087 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2088 else 2089 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2090 sp->pp_flags &= ~PP_NEEDAUTH; 2091 sppp_open_event(&lcp, sp); 2092 } 2093 2094 static void 2095 sppp_lcp_close(struct sppp *sp) 2096 { 2097 sppp_close_event(&lcp, sp); 2098 } 2099 2100 static void 2101 sppp_lcp_TO(void *cookie) 2102 { 2103 sppp_to_event(&lcp, (struct sppp *)cookie); 2104 } 2105 2106 /* 2107 * Analyze a configure request. Return true if it was agreeable, and 2108 * caused action sca, false if it has been rejected or nak'ed, and 2109 * caused action scn. (The return value is used to make the state 2110 * transition decision in the state automaton.) 2111 */ 2112 static int 2113 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2114 { 2115 STDDCL; 2116 u_char *buf, *r, *p; 2117 int origlen, rlen; 2118 uint32_t nmagic; 2119 u_short authproto; 2120 2121 len -= 4; 2122 origlen = len; 2123 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2124 if (! buf) 2125 return (0); 2126 2127 if (debug) 2128 log(LOG_DEBUG, "%s: lcp parse opts:", 2129 ifp->if_xname); 2130 2131 /* pass 1: check for things that need to be rejected */ 2132 p = (void *)(h + 1); 2133 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2134 /* Sanity check option length */ 2135 if (p[1] > len) { 2136 /* 2137 * Malicious option - drop immediately. 2138 * XXX Maybe we should just RXJ it? 2139 */ 2140 addlog("%s: received malicious LCP option 0x%02x, " 2141 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2142 p[0], p[1], len); 2143 goto drop; 2144 } 2145 if (debug) 2146 addlog(" %s", sppp_lcp_opt_name(*p)); 2147 switch (*p) { 2148 case LCP_OPT_MAGIC: 2149 /* Magic number. */ 2150 /* fall through, both are same length */ 2151 case LCP_OPT_ASYNC_MAP: 2152 /* Async control character map. */ 2153 if (len >= 6 || p[1] == 6) 2154 continue; 2155 if (debug) 2156 addlog(" [invalid]"); 2157 break; 2158 case LCP_OPT_MRU: 2159 /* Maximum receive unit. */ 2160 if (len >= 4 && p[1] == 4) 2161 continue; 2162 if (debug) 2163 addlog(" [invalid]"); 2164 break; 2165 case LCP_OPT_AUTH_PROTO: 2166 if (len < 4) { 2167 if (debug) 2168 addlog(" [invalid]"); 2169 break; 2170 } 2171 authproto = (p[2] << 8) + p[3]; 2172 if (authproto == PPP_CHAP && p[1] != 5) { 2173 if (debug) 2174 addlog(" [invalid chap len]"); 2175 break; 2176 } 2177 if (sp->myauth.proto == 0) { 2178 /* we are not configured to do auth */ 2179 if (debug) 2180 addlog(" [not configured]"); 2181 break; 2182 } 2183 /* 2184 * Remote want us to authenticate, remember this, 2185 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2186 * up. 2187 */ 2188 sp->pp_flags |= PP_NEEDAUTH; 2189 continue; 2190 default: 2191 /* Others not supported. */ 2192 if (debug) 2193 addlog(" [rej]"); 2194 break; 2195 } 2196 /* Add the option to rejected list. */ 2197 bcopy (p, r, p[1]); 2198 r += p[1]; 2199 rlen += p[1]; 2200 } 2201 if (rlen) { 2202 if (debug) 2203 addlog(" send conf-rej\n"); 2204 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2205 goto end; 2206 } else if (debug) 2207 addlog("\n"); 2208 2209 /* 2210 * pass 2: check for option values that are unacceptable and 2211 * thus require to be nak'ed. 2212 */ 2213 if (debug) 2214 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2215 ifp->if_xname); 2216 2217 p = (void *)(h + 1); 2218 len = origlen; 2219 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2220 if (debug) 2221 addlog(" %s", sppp_lcp_opt_name(*p)); 2222 switch (*p) { 2223 case LCP_OPT_MAGIC: 2224 /* Magic number -- extract. */ 2225 nmagic = (uint32_t)p[2] << 24 | 2226 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2227 if (nmagic != sp->lcp.magic) { 2228 if (debug) 2229 addlog(" 0x%x", nmagic); 2230 continue; 2231 } 2232 /* 2233 * Local and remote magics equal -- loopback? 2234 */ 2235 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2236 printf ("%s: loopback\n", 2237 ifp->if_xname); 2238 sp->pp_loopcnt = 0; 2239 if (ifp->if_flags & IFF_UP) { 2240 if_down(ifp); 2241 IF_PURGE(&sp->pp_cpq); 2242 /* XXX ? */ 2243 lcp.Down(sp); 2244 lcp.Up(sp); 2245 } 2246 } else if (debug) 2247 addlog(" [glitch]"); 2248 ++sp->pp_loopcnt; 2249 /* 2250 * We negate our magic here, and NAK it. If 2251 * we see it later in an NAK packet, we 2252 * suggest a new one. 2253 */ 2254 nmagic = ~sp->lcp.magic; 2255 /* Gonna NAK it. */ 2256 p[2] = nmagic >> 24; 2257 p[3] = nmagic >> 16; 2258 p[4] = nmagic >> 8; 2259 p[5] = nmagic; 2260 break; 2261 2262 case LCP_OPT_ASYNC_MAP: 2263 /* 2264 * Async control character map -- just ignore it. 2265 * 2266 * Quote from RFC 1662, chapter 6: 2267 * To enable this functionality, synchronous PPP 2268 * implementations MUST always respond to the 2269 * Async-Control-Character-Map Configuration 2270 * Option with the LCP Configure-Ack. However, 2271 * acceptance of the Configuration Option does 2272 * not imply that the synchronous implementation 2273 * will do any ACCM mapping. Instead, all such 2274 * octet mapping will be performed by the 2275 * asynchronous-to-synchronous converter. 2276 */ 2277 continue; 2278 2279 case LCP_OPT_MRU: 2280 /* 2281 * Maximum receive unit. Always agreeable, 2282 * but ignored by now. 2283 */ 2284 sp->lcp.their_mru = p[2] * 256 + p[3]; 2285 if (debug) 2286 addlog(" %ld", sp->lcp.their_mru); 2287 continue; 2288 2289 case LCP_OPT_AUTH_PROTO: 2290 authproto = (p[2] << 8) + p[3]; 2291 if (sp->myauth.proto != authproto) { 2292 /* not agreed, nak */ 2293 if (debug) 2294 addlog(" [mine %s != his %s]", 2295 sppp_proto_name(sp->myauth.proto), 2296 sppp_proto_name(authproto)); 2297 p[2] = sp->myauth.proto >> 8; 2298 p[3] = sp->myauth.proto; 2299 break; 2300 } 2301 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2302 if (debug) 2303 addlog(" [chap not MD5]"); 2304 p[4] = CHAP_MD5; 2305 break; 2306 } 2307 continue; 2308 } 2309 /* Add the option to nak'ed list. */ 2310 bcopy (p, r, p[1]); 2311 r += p[1]; 2312 rlen += p[1]; 2313 } 2314 if (rlen) { 2315 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2316 if (debug) 2317 addlog(" max_failure (%d) exceeded, " 2318 "send conf-rej\n", 2319 sp->lcp.max_failure); 2320 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2321 } else { 2322 if (debug) 2323 addlog(" send conf-nak\n"); 2324 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2325 } 2326 goto end; 2327 } else { 2328 if (debug) 2329 addlog(" send conf-ack\n"); 2330 sp->fail_counter[IDX_LCP] = 0; 2331 sp->pp_loopcnt = 0; 2332 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2333 } 2334 2335 end: 2336 free(buf, M_TEMP); 2337 return (rlen == 0); 2338 2339 drop: 2340 free(buf, M_TEMP); 2341 return -1; 2342 } 2343 2344 /* 2345 * Analyze the LCP Configure-Reject option list, and adjust our 2346 * negotiation. 2347 */ 2348 static void 2349 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2350 { 2351 STDDCL; 2352 u_char *buf, *p; 2353 2354 len -= 4; 2355 buf = malloc (len, M_TEMP, M_NOWAIT); 2356 if (!buf) 2357 return; 2358 2359 if (debug) 2360 log(LOG_DEBUG, "%s: lcp rej opts:", 2361 ifp->if_xname); 2362 2363 p = (void *)(h + 1); 2364 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2365 /* Sanity check option length */ 2366 if (p[1] > len) { 2367 /* 2368 * Malicious option - drop immediately. 2369 * XXX Maybe we should just RXJ it? 2370 */ 2371 addlog("%s: received malicious LCP option, " 2372 "dropping.\n", ifp->if_xname); 2373 goto drop; 2374 } 2375 if (debug) 2376 addlog(" %s", sppp_lcp_opt_name(*p)); 2377 switch (*p) { 2378 case LCP_OPT_MAGIC: 2379 /* Magic number -- can't use it, use 0 */ 2380 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2381 sp->lcp.magic = 0; 2382 break; 2383 case LCP_OPT_MRU: 2384 /* 2385 * We try to negotiate a lower MRU if the underlying 2386 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2387 * peer rejects this lower rate, fallback to the 2388 * default. 2389 */ 2390 if (debug) { 2391 addlog("%s: warning: peer rejected our MRU of " 2392 "%ld bytes. Defaulting to %d bytes\n", 2393 ifp->if_xname, sp->lcp.mru, PP_MTU); 2394 } 2395 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2396 sp->lcp.mru = PP_MTU; 2397 break; 2398 case LCP_OPT_AUTH_PROTO: 2399 /* 2400 * Peer doesn't want to authenticate himself, 2401 * deny unless this is a dialout call, and 2402 * SPPP_AUTHFLAG_NOCALLOUT is set. 2403 */ 2404 if ((sp->pp_flags & PP_CALLIN) == 0 && 2405 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2406 if (debug) 2407 addlog(" [don't insist on auth " 2408 "for callout]"); 2409 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2410 break; 2411 } 2412 if (debug) 2413 addlog("[access denied]\n"); 2414 lcp.Close(sp); 2415 break; 2416 } 2417 } 2418 if (debug) 2419 addlog("\n"); 2420 drop: 2421 free(buf, M_TEMP); 2422 return; 2423 } 2424 2425 /* 2426 * Analyze the LCP Configure-NAK option list, and adjust our 2427 * negotiation. 2428 */ 2429 static void 2430 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2431 { 2432 STDDCL; 2433 u_char *buf, *p; 2434 uint32_t magic; 2435 2436 len -= 4; 2437 buf = malloc (len, M_TEMP, M_NOWAIT); 2438 if (!buf) 2439 return; 2440 2441 if (debug) 2442 log(LOG_DEBUG, "%s: lcp nak opts:", 2443 ifp->if_xname); 2444 2445 p = (void *)(h + 1); 2446 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2447 /* Sanity check option length */ 2448 if (p[1] > len) { 2449 /* 2450 * Malicious option - drop immediately. 2451 * XXX Maybe we should just RXJ it? 2452 */ 2453 addlog("%s: received malicious LCP option, " 2454 "dropping.\n", ifp->if_xname); 2455 goto drop; 2456 } 2457 if (debug) 2458 addlog(" %s", sppp_lcp_opt_name(*p)); 2459 switch (*p) { 2460 case LCP_OPT_MAGIC: 2461 /* Magic number -- renegotiate */ 2462 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2463 len >= 6 && p[1] == 6) { 2464 magic = (uint32_t)p[2] << 24 | 2465 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2466 /* 2467 * If the remote magic is our negated one, 2468 * this looks like a loopback problem. 2469 * Suggest a new magic to make sure. 2470 */ 2471 if (magic == ~sp->lcp.magic) { 2472 if (debug) 2473 addlog(" magic glitch"); 2474 sp->lcp.magic = arc4random(); 2475 } else { 2476 sp->lcp.magic = magic; 2477 if (debug) 2478 addlog(" %d", magic); 2479 } 2480 } 2481 break; 2482 case LCP_OPT_MRU: 2483 /* 2484 * Peer wants to advise us to negotiate an MRU. 2485 * Agree on it if it's reasonable, or use 2486 * default otherwise. 2487 */ 2488 if (len >= 4 && p[1] == 4) { 2489 u_int mru = p[2] * 256 + p[3]; 2490 if (debug) 2491 addlog(" %d", mru); 2492 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2493 mru = sp->pp_if.if_mtu; 2494 sp->lcp.mru = mru; 2495 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2496 } 2497 break; 2498 case LCP_OPT_AUTH_PROTO: 2499 /* 2500 * Peer doesn't like our authentication method, 2501 * deny. 2502 */ 2503 if (debug) 2504 addlog("[access denied]\n"); 2505 lcp.Close(sp); 2506 break; 2507 } 2508 } 2509 if (debug) 2510 addlog("\n"); 2511 drop: 2512 free(buf, M_TEMP); 2513 return; 2514 } 2515 2516 static void 2517 sppp_lcp_tlu(struct sppp *sp) 2518 { 2519 STDDCL; 2520 int i; 2521 uint32_t mask; 2522 2523 /* XXX ? */ 2524 if (! (ifp->if_flags & IFF_UP) && 2525 (ifp->if_flags & IFF_RUNNING)) { 2526 /* Coming out of loopback mode. */ 2527 if_up(ifp); 2528 } 2529 2530 for (i = 0; i < IDX_COUNT; i++) 2531 if ((cps[i])->flags & CP_QUAL) 2532 (cps[i])->Open(sp); 2533 2534 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2535 (sp->pp_flags & PP_NEEDAUTH) != 0) 2536 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2537 else 2538 sp->pp_phase = SPPP_PHASE_NETWORK; 2539 2540 if (debug) 2541 { 2542 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2543 sppp_phase_name(sp->pp_phase)); 2544 } 2545 2546 /* 2547 * Open all authentication protocols. This is even required 2548 * if we already proceeded to network phase, since it might be 2549 * that remote wants us to authenticate, so we might have to 2550 * send a PAP request. Undesired authentication protocols 2551 * don't do anything when they get an Open event. 2552 */ 2553 for (i = 0; i < IDX_COUNT; i++) 2554 if ((cps[i])->flags & CP_AUTH) 2555 (cps[i])->Open(sp); 2556 2557 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2558 /* Notify all NCPs. */ 2559 for (i = 0; i < IDX_COUNT; i++) 2560 if ((cps[i])->flags & CP_NCP) 2561 (cps[i])->Open(sp); 2562 } 2563 2564 /* Send Up events to all started protos. */ 2565 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2566 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2567 (cps[i])->Up(sp); 2568 2569 /* notify low-level driver of state change */ 2570 if (sp->pp_chg) 2571 sp->pp_chg(sp, (int)sp->pp_phase); 2572 2573 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2574 /* if no NCP is starting, close down */ 2575 sppp_lcp_check_and_close(sp); 2576 } 2577 2578 static void 2579 sppp_lcp_tld(struct sppp *sp) 2580 { 2581 STDDCL; 2582 int i; 2583 uint32_t mask; 2584 2585 sp->pp_phase = SPPP_PHASE_TERMINATE; 2586 2587 if (debug) 2588 { 2589 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2590 sppp_phase_name(sp->pp_phase)); 2591 } 2592 2593 /* 2594 * Take upper layers down. We send the Down event first and 2595 * the Close second to prevent the upper layers from sending 2596 * ``a flurry of terminate-request packets'', as the RFC 2597 * describes it. 2598 */ 2599 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2600 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2601 (cps[i])->Down(sp); 2602 (cps[i])->Close(sp); 2603 } 2604 } 2605 2606 static void 2607 sppp_lcp_tls(struct sppp *sp) 2608 { 2609 STDDCL; 2610 2611 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2612 printf("%s: authentication failed %d times, not retrying again\n", 2613 sp->pp_if.if_xname, sp->pp_auth_failures); 2614 if_down(&sp->pp_if); 2615 return; 2616 } 2617 2618 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2619 2620 if (debug) 2621 { 2622 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2623 sppp_phase_name(sp->pp_phase)); 2624 } 2625 2626 /* Notify lower layer if desired. */ 2627 if (sp->pp_tls) 2628 (sp->pp_tls)(sp); 2629 } 2630 2631 static void 2632 sppp_lcp_tlf(struct sppp *sp) 2633 { 2634 STDDCL; 2635 2636 sp->pp_phase = SPPP_PHASE_DEAD; 2637 2638 if (debug) 2639 { 2640 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2641 sppp_phase_name(sp->pp_phase)); 2642 } 2643 2644 /* Notify lower layer if desired. */ 2645 if (sp->pp_tlf) 2646 (sp->pp_tlf)(sp); 2647 } 2648 2649 static void 2650 sppp_lcp_scr(struct sppp *sp) 2651 { 2652 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2653 int i = 0; 2654 u_short authproto; 2655 2656 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2657 if (! sp->lcp.magic) 2658 sp->lcp.magic = arc4random(); 2659 opt[i++] = LCP_OPT_MAGIC; 2660 opt[i++] = 6; 2661 opt[i++] = sp->lcp.magic >> 24; 2662 opt[i++] = sp->lcp.magic >> 16; 2663 opt[i++] = sp->lcp.magic >> 8; 2664 opt[i++] = sp->lcp.magic; 2665 } 2666 2667 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2668 opt[i++] = LCP_OPT_MRU; 2669 opt[i++] = 4; 2670 opt[i++] = sp->lcp.mru >> 8; 2671 opt[i++] = sp->lcp.mru; 2672 } 2673 2674 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2675 authproto = sp->hisauth.proto; 2676 opt[i++] = LCP_OPT_AUTH_PROTO; 2677 opt[i++] = authproto == PPP_CHAP? 5: 4; 2678 opt[i++] = authproto >> 8; 2679 opt[i++] = authproto; 2680 if (authproto == PPP_CHAP) 2681 opt[i++] = CHAP_MD5; 2682 } 2683 2684 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2685 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2686 } 2687 2688 /* 2689 * Check the open NCPs, return true if at least one NCP is open. 2690 */ 2691 static int 2692 sppp_ncp_check(struct sppp *sp) 2693 { 2694 int i, mask; 2695 2696 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2697 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2698 return 1; 2699 return 0; 2700 } 2701 2702 /* 2703 * Re-check the open NCPs and see if we should terminate the link. 2704 * Called by the NCPs during their tlf action handling. 2705 */ 2706 static void 2707 sppp_lcp_check_and_close(struct sppp *sp) 2708 { 2709 2710 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2711 /* don't bother, we are already going down */ 2712 return; 2713 2714 if (sppp_ncp_check(sp)) 2715 return; 2716 2717 lcp.Close(sp); 2718 } 2719 2720 2721 /* 2722 *--------------------------------------------------------------------------* 2723 * * 2724 * The IPCP implementation. * 2725 * * 2726 *--------------------------------------------------------------------------* 2727 */ 2728 2729 static void 2730 sppp_ipcp_init(struct sppp *sp) 2731 { 2732 sp->ipcp.opts = 0; 2733 sp->ipcp.flags = 0; 2734 sp->state[IDX_IPCP] = STATE_INITIAL; 2735 sp->fail_counter[IDX_IPCP] = 0; 2736 sp->pp_seq[IDX_IPCP] = 0; 2737 sp->pp_rseq[IDX_IPCP] = 0; 2738 callout_init(&sp->ch[IDX_IPCP], 0); 2739 } 2740 2741 static void 2742 sppp_ipcp_up(struct sppp *sp) 2743 { 2744 sppp_up_event(&ipcp, sp); 2745 } 2746 2747 static void 2748 sppp_ipcp_down(struct sppp *sp) 2749 { 2750 sppp_down_event(&ipcp, sp); 2751 } 2752 2753 static void 2754 sppp_ipcp_open(struct sppp *sp) 2755 { 2756 STDDCL; 2757 uint32_t myaddr, hisaddr; 2758 2759 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2760 sp->ipcp.req_myaddr = 0; 2761 sp->ipcp.req_hisaddr = 0; 2762 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2763 2764 #ifdef INET 2765 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2766 #else 2767 myaddr = hisaddr = 0; 2768 #endif 2769 /* 2770 * If we don't have his address, this probably means our 2771 * interface doesn't want to talk IP at all. (This could 2772 * be the case if somebody wants to speak only IPX, for 2773 * example.) Don't open IPCP in this case. 2774 */ 2775 if (hisaddr == 0) { 2776 /* XXX this message should go away */ 2777 if (debug) 2778 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2779 ifp->if_xname); 2780 return; 2781 } 2782 2783 if (myaddr == 0) { 2784 /* 2785 * I don't have an assigned address, so i need to 2786 * negotiate my address. 2787 */ 2788 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2789 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2790 } 2791 if (hisaddr == 1) { 2792 /* 2793 * XXX - remove this hack! 2794 * remote has no valid address, we need to get one assigned. 2795 */ 2796 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2797 } 2798 sppp_open_event(&ipcp, sp); 2799 } 2800 2801 static void 2802 sppp_ipcp_close(struct sppp *sp) 2803 { 2804 STDDCL; 2805 2806 sppp_close_event(&ipcp, sp); 2807 #ifdef INET 2808 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2809 /* 2810 * Some address was dynamic, clear it again. 2811 */ 2812 sppp_clear_ip_addrs(sp); 2813 #endif 2814 2815 if (sp->pp_saved_mtu > 0) { 2816 ifp->if_mtu = sp->pp_saved_mtu; 2817 sp->pp_saved_mtu = 0; 2818 if (debug) 2819 log(LOG_DEBUG, 2820 "%s: resetting MTU to %" PRIu64 " bytes\n", 2821 ifp->if_xname, ifp->if_mtu); 2822 } 2823 } 2824 2825 static void 2826 sppp_ipcp_TO(void *cookie) 2827 { 2828 sppp_to_event(&ipcp, (struct sppp *)cookie); 2829 } 2830 2831 /* 2832 * Analyze a configure request. Return true if it was agreeable, and 2833 * caused action sca, false if it has been rejected or nak'ed, and 2834 * caused action scn. (The return value is used to make the state 2835 * transition decision in the state automaton.) 2836 */ 2837 static int 2838 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2839 { 2840 u_char *buf, *r, *p; 2841 struct ifnet *ifp = &sp->pp_if; 2842 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2843 uint32_t hisaddr, desiredaddr; 2844 2845 len -= 4; 2846 origlen = len; 2847 /* 2848 * Make sure to allocate a buf that can at least hold a 2849 * conf-nak with an `address' option. We might need it below. 2850 */ 2851 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2852 if (! buf) 2853 return (0); 2854 2855 /* pass 1: see if we can recognize them */ 2856 if (debug) 2857 log(LOG_DEBUG, "%s: ipcp parse opts:", 2858 ifp->if_xname); 2859 p = (void *)(h + 1); 2860 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2861 /* Sanity check option length */ 2862 if (p[1] > len) { 2863 /* XXX should we just RXJ? */ 2864 addlog("%s: malicious IPCP option received, dropping\n", 2865 ifp->if_xname); 2866 goto drop; 2867 } 2868 if (debug) 2869 addlog(" %s", sppp_ipcp_opt_name(*p)); 2870 switch (*p) { 2871 #ifdef notyet 2872 case IPCP_OPT_COMPRESSION: 2873 if (len >= 6 && p[1] >= 6) { 2874 /* correctly formed compress option */ 2875 continue; 2876 } 2877 if (debug) 2878 addlog(" [invalid]"); 2879 break; 2880 #endif 2881 case IPCP_OPT_ADDRESS: 2882 if (len >= 6 && p[1] == 6) { 2883 /* correctly formed address option */ 2884 continue; 2885 } 2886 if (debug) 2887 addlog(" [invalid]"); 2888 break; 2889 default: 2890 /* Others not supported. */ 2891 if (debug) 2892 addlog(" [rej]"); 2893 break; 2894 } 2895 /* Add the option to rejected list. */ 2896 bcopy (p, r, p[1]); 2897 r += p[1]; 2898 rlen += p[1]; 2899 } 2900 if (rlen) { 2901 if (debug) 2902 addlog(" send conf-rej\n"); 2903 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2904 goto end; 2905 } else if (debug) 2906 addlog("\n"); 2907 2908 /* pass 2: parse option values */ 2909 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2910 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2911 else 2912 #ifdef INET 2913 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2914 #else 2915 hisaddr = 0; 2916 #endif 2917 if (debug) 2918 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2919 ifp->if_xname); 2920 p = (void *)(h + 1); 2921 len = origlen; 2922 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2923 if (debug) 2924 addlog(" %s", sppp_ipcp_opt_name(*p)); 2925 switch (*p) { 2926 #ifdef notyet 2927 case IPCP_OPT_COMPRESSION: 2928 continue; 2929 #endif 2930 case IPCP_OPT_ADDRESS: 2931 desiredaddr = p[2] << 24 | p[3] << 16 | 2932 p[4] << 8 | p[5]; 2933 if (desiredaddr == hisaddr || 2934 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2935 /* 2936 * Peer's address is same as our value, 2937 * this is agreeable. Gonna conf-ack 2938 * it. 2939 */ 2940 if (debug) 2941 addlog(" %s [ack]", 2942 sppp_dotted_quad(hisaddr)); 2943 /* record that we've seen it already */ 2944 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2945 sp->ipcp.req_hisaddr = desiredaddr; 2946 hisaddr = desiredaddr; 2947 continue; 2948 } 2949 /* 2950 * The address wasn't agreeable. This is either 2951 * he sent us 0.0.0.0, asking to assign him an 2952 * address, or he send us another address not 2953 * matching our value. Either case, we gonna 2954 * conf-nak it with our value. 2955 */ 2956 if (debug) { 2957 if (desiredaddr == 0) 2958 addlog(" [addr requested]"); 2959 else 2960 addlog(" %s [not agreed]", 2961 sppp_dotted_quad(desiredaddr)); 2962 } 2963 2964 p[2] = hisaddr >> 24; 2965 p[3] = hisaddr >> 16; 2966 p[4] = hisaddr >> 8; 2967 p[5] = hisaddr; 2968 break; 2969 } 2970 /* Add the option to nak'ed list. */ 2971 bcopy (p, r, p[1]); 2972 r += p[1]; 2973 rlen += p[1]; 2974 } 2975 2976 /* 2977 * If we are about to conf-ack the request, but haven't seen 2978 * his address so far, gonna conf-nak it instead, with the 2979 * `address' option present and our idea of his address being 2980 * filled in there, to request negotiation of both addresses. 2981 * 2982 * XXX This can result in an endless req - nak loop if peer 2983 * doesn't want to send us his address. Q: What should we do 2984 * about it? XXX A: implement the max-failure counter. 2985 */ 2986 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2987 buf[0] = IPCP_OPT_ADDRESS; 2988 buf[1] = 6; 2989 buf[2] = hisaddr >> 24; 2990 buf[3] = hisaddr >> 16; 2991 buf[4] = hisaddr >> 8; 2992 buf[5] = hisaddr; 2993 rlen = 6; 2994 if (debug) 2995 addlog(" still need hisaddr"); 2996 } 2997 2998 if (rlen) { 2999 if (debug) 3000 addlog(" send conf-nak\n"); 3001 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3002 } else { 3003 if (debug) 3004 addlog(" send conf-ack\n"); 3005 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3006 } 3007 3008 end: 3009 free(buf, M_TEMP); 3010 return (rlen == 0); 3011 3012 drop: 3013 free(buf, M_TEMP); 3014 return -1; 3015 } 3016 3017 /* 3018 * Analyze the IPCP Configure-Reject option list, and adjust our 3019 * negotiation. 3020 */ 3021 static void 3022 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3023 { 3024 u_char *buf, *p; 3025 struct ifnet *ifp = &sp->pp_if; 3026 int debug = ifp->if_flags & IFF_DEBUG; 3027 3028 len -= 4; 3029 buf = malloc (len, M_TEMP, M_NOWAIT); 3030 if (!buf) 3031 return; 3032 3033 if (debug) 3034 log(LOG_DEBUG, "%s: ipcp rej opts:", 3035 ifp->if_xname); 3036 3037 p = (void *)(h + 1); 3038 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3039 /* Sanity check option length */ 3040 if (p[1] > len) { 3041 /* XXX should we just RXJ? */ 3042 addlog("%s: malicious IPCP option received, dropping\n", 3043 ifp->if_xname); 3044 goto drop; 3045 } 3046 if (debug) 3047 addlog(" %s", sppp_ipcp_opt_name(*p)); 3048 switch (*p) { 3049 case IPCP_OPT_ADDRESS: 3050 /* 3051 * Peer doesn't grok address option. This is 3052 * bad. XXX Should we better give up here? 3053 */ 3054 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3055 break; 3056 #ifdef notyet 3057 case IPCP_OPT_COMPRESS: 3058 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3059 break; 3060 #endif 3061 } 3062 } 3063 if (debug) 3064 addlog("\n"); 3065 drop: 3066 free(buf, M_TEMP); 3067 return; 3068 } 3069 3070 /* 3071 * Analyze the IPCP Configure-NAK option list, and adjust our 3072 * negotiation. 3073 */ 3074 static void 3075 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3076 { 3077 u_char *p; 3078 struct ifnet *ifp = &sp->pp_if; 3079 int debug = ifp->if_flags & IFF_DEBUG; 3080 uint32_t wantaddr; 3081 3082 len -= 4; 3083 3084 if (debug) 3085 log(LOG_DEBUG, "%s: ipcp nak opts:", 3086 ifp->if_xname); 3087 3088 p = (void *)(h + 1); 3089 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3090 /* Sanity check option length */ 3091 if (p[1] > len) { 3092 /* XXX should we just RXJ? */ 3093 addlog("%s: malicious IPCP option received, dropping\n", 3094 ifp->if_xname); 3095 return; 3096 } 3097 if (debug) 3098 addlog(" %s", sppp_ipcp_opt_name(*p)); 3099 switch (*p) { 3100 case IPCP_OPT_ADDRESS: 3101 /* 3102 * Peer doesn't like our local IP address. See 3103 * if we can do something for him. We'll drop 3104 * him our address then. 3105 */ 3106 if (len >= 6 && p[1] == 6) { 3107 wantaddr = p[2] << 24 | p[3] << 16 | 3108 p[4] << 8 | p[5]; 3109 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3110 if (debug) 3111 addlog(" [wantaddr %s]", 3112 sppp_dotted_quad(wantaddr)); 3113 /* 3114 * When doing dynamic address assignment, 3115 * we accept his offer. Otherwise, we 3116 * ignore it and thus continue to negotiate 3117 * our already existing value. 3118 */ 3119 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3120 if (debug) 3121 addlog(" [agree]"); 3122 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3123 sp->ipcp.req_myaddr = wantaddr; 3124 } 3125 } 3126 break; 3127 3128 case IPCP_OPT_PRIMDNS: 3129 if (len >= 6 && p[1] == 6) { 3130 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3131 p[4] << 8 | p[5]; 3132 } 3133 break; 3134 3135 case IPCP_OPT_SECDNS: 3136 if (len >= 6 && p[1] == 6) { 3137 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3138 p[4] << 8 | p[5]; 3139 } 3140 break; 3141 #ifdef notyet 3142 case IPCP_OPT_COMPRESS: 3143 /* 3144 * Peer wants different compression parameters. 3145 */ 3146 break; 3147 #endif 3148 } 3149 } 3150 if (debug) 3151 addlog("\n"); 3152 } 3153 3154 static void 3155 sppp_ipcp_tlu(struct sppp *sp) 3156 { 3157 #ifdef INET 3158 /* we are up. Set addresses and notify anyone interested */ 3159 STDDCL; 3160 uint32_t myaddr, hisaddr; 3161 3162 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3163 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3164 myaddr = sp->ipcp.req_myaddr; 3165 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3166 hisaddr = sp->ipcp.req_hisaddr; 3167 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3168 3169 if (ifp->if_mtu > sp->lcp.their_mru) { 3170 sp->pp_saved_mtu = ifp->if_mtu; 3171 ifp->if_mtu = sp->lcp.their_mru; 3172 if (debug) 3173 log(LOG_DEBUG, 3174 "%s: setting MTU to %" PRIu64 " bytes\n", 3175 ifp->if_xname, ifp->if_mtu); 3176 } 3177 3178 if (sp->pp_con) 3179 sp->pp_con(sp); 3180 #endif 3181 } 3182 3183 static void 3184 sppp_ipcp_tld(struct sppp *sp) 3185 { 3186 } 3187 3188 static void 3189 sppp_ipcp_tls(struct sppp *sp) 3190 { 3191 /* indicate to LCP that it must stay alive */ 3192 sp->lcp.protos |= (1 << IDX_IPCP); 3193 } 3194 3195 static void 3196 sppp_ipcp_tlf(struct sppp *sp) 3197 { 3198 /* we no longer need LCP */ 3199 sp->lcp.protos &= ~(1 << IDX_IPCP); 3200 } 3201 3202 static void 3203 sppp_ipcp_scr(struct sppp *sp) 3204 { 3205 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3206 #ifdef INET 3207 uint32_t ouraddr; 3208 #endif 3209 int i = 0; 3210 3211 #ifdef notyet 3212 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3213 opt[i++] = IPCP_OPT_COMPRESSION; 3214 opt[i++] = 6; 3215 opt[i++] = 0; /* VJ header compression */ 3216 opt[i++] = 0x2d; /* VJ header compression */ 3217 opt[i++] = max_slot_id; 3218 opt[i++] = comp_slot_id; 3219 } 3220 #endif 3221 3222 #ifdef INET 3223 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3224 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3225 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3226 else 3227 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3228 opt[i++] = IPCP_OPT_ADDRESS; 3229 opt[i++] = 6; 3230 opt[i++] = ouraddr >> 24; 3231 opt[i++] = ouraddr >> 16; 3232 opt[i++] = ouraddr >> 8; 3233 opt[i++] = ouraddr; 3234 } 3235 #endif 3236 3237 if (sp->query_dns & 1) { 3238 opt[i++] = IPCP_OPT_PRIMDNS; 3239 opt[i++] = 6; 3240 opt[i++] = sp->dns_addrs[0] >> 24; 3241 opt[i++] = sp->dns_addrs[0] >> 16; 3242 opt[i++] = sp->dns_addrs[0] >> 8; 3243 opt[i++] = sp->dns_addrs[0]; 3244 } 3245 if (sp->query_dns & 2) { 3246 opt[i++] = IPCP_OPT_SECDNS; 3247 opt[i++] = 6; 3248 opt[i++] = sp->dns_addrs[1] >> 24; 3249 opt[i++] = sp->dns_addrs[1] >> 16; 3250 opt[i++] = sp->dns_addrs[1] >> 8; 3251 opt[i++] = sp->dns_addrs[1]; 3252 } 3253 3254 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3255 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3256 } 3257 3258 3259 /* 3260 *--------------------------------------------------------------------------* 3261 * * 3262 * The IPv6CP implementation. * 3263 * * 3264 *--------------------------------------------------------------------------* 3265 */ 3266 3267 #ifdef INET6 3268 static void 3269 sppp_ipv6cp_init(struct sppp *sp) 3270 { 3271 sp->ipv6cp.opts = 0; 3272 sp->ipv6cp.flags = 0; 3273 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3274 sp->fail_counter[IDX_IPV6CP] = 0; 3275 sp->pp_seq[IDX_IPV6CP] = 0; 3276 sp->pp_rseq[IDX_IPV6CP] = 0; 3277 callout_init(&sp->ch[IDX_IPV6CP], 0); 3278 } 3279 3280 static void 3281 sppp_ipv6cp_up(struct sppp *sp) 3282 { 3283 sppp_up_event(&ipv6cp, sp); 3284 } 3285 3286 static void 3287 sppp_ipv6cp_down(struct sppp *sp) 3288 { 3289 sppp_down_event(&ipv6cp, sp); 3290 } 3291 3292 static void 3293 sppp_ipv6cp_open(struct sppp *sp) 3294 { 3295 STDDCL; 3296 struct in6_addr myaddr, hisaddr; 3297 3298 #ifdef IPV6CP_MYIFID_DYN 3299 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3300 #else 3301 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3302 #endif 3303 3304 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3305 /* 3306 * If we don't have our address, this probably means our 3307 * interface doesn't want to talk IPv6 at all. (This could 3308 * be the case if somebody wants to speak only IPX, for 3309 * example.) Don't open IPv6CP in this case. 3310 */ 3311 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3312 /* XXX this message should go away */ 3313 if (debug) 3314 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3315 ifp->if_xname); 3316 return; 3317 } 3318 3319 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3320 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3321 sppp_open_event(&ipv6cp, sp); 3322 } 3323 3324 static void 3325 sppp_ipv6cp_close(struct sppp *sp) 3326 { 3327 sppp_close_event(&ipv6cp, sp); 3328 } 3329 3330 static void 3331 sppp_ipv6cp_TO(void *cookie) 3332 { 3333 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3334 } 3335 3336 /* 3337 * Analyze a configure request. Return true if it was agreeable, and 3338 * caused action sca, false if it has been rejected or nak'ed, and 3339 * caused action scn. (The return value is used to make the state 3340 * transition decision in the state automaton.) 3341 */ 3342 static int 3343 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3344 { 3345 u_char *buf, *r, *p; 3346 struct ifnet *ifp = &sp->pp_if; 3347 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3348 struct in6_addr myaddr, desiredaddr, suggestaddr; 3349 int ifidcount; 3350 int type; 3351 int collision, nohisaddr; 3352 3353 len -= 4; 3354 origlen = len; 3355 /* 3356 * Make sure to allocate a buf that can at least hold a 3357 * conf-nak with an `address' option. We might need it below. 3358 */ 3359 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3360 if (! buf) 3361 return (0); 3362 3363 /* pass 1: see if we can recognize them */ 3364 if (debug) 3365 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3366 ifp->if_xname); 3367 p = (void *)(h + 1); 3368 ifidcount = 0; 3369 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3370 /* Sanity check option length */ 3371 if (p[1] > len) { 3372 /* XXX just RXJ? */ 3373 addlog("%s: received malicious IPCPv6 option, " 3374 "dropping\n", ifp->if_xname); 3375 goto drop; 3376 } 3377 if (debug) 3378 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3379 switch (*p) { 3380 case IPV6CP_OPT_IFID: 3381 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3382 /* correctly formed address option */ 3383 ifidcount++; 3384 continue; 3385 } 3386 if (debug) 3387 addlog(" [invalid]"); 3388 break; 3389 #ifdef notyet 3390 case IPV6CP_OPT_COMPRESSION: 3391 if (len >= 4 && p[1] >= 4) { 3392 /* correctly formed compress option */ 3393 continue; 3394 } 3395 if (debug) 3396 addlog(" [invalid]"); 3397 break; 3398 #endif 3399 default: 3400 /* Others not supported. */ 3401 if (debug) 3402 addlog(" [rej]"); 3403 break; 3404 } 3405 /* Add the option to rejected list. */ 3406 bcopy (p, r, p[1]); 3407 r += p[1]; 3408 rlen += p[1]; 3409 } 3410 if (rlen) { 3411 if (debug) 3412 addlog(" send conf-rej\n"); 3413 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3414 goto end; 3415 } else if (debug) 3416 addlog("\n"); 3417 3418 /* pass 2: parse option values */ 3419 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3420 if (debug) 3421 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3422 ifp->if_xname); 3423 p = (void *)(h + 1); 3424 len = origlen; 3425 type = CONF_ACK; 3426 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3427 if (debug) 3428 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3429 switch (*p) { 3430 #ifdef notyet 3431 case IPV6CP_OPT_COMPRESSION: 3432 continue; 3433 #endif 3434 case IPV6CP_OPT_IFID: 3435 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3436 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3437 collision = (memcmp(&desiredaddr.s6_addr[8], 3438 &myaddr.s6_addr[8], 8) == 0); 3439 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3440 3441 desiredaddr.s6_addr16[0] = htons(0xfe80); 3442 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3443 3444 if (!collision && !nohisaddr) { 3445 /* no collision, hisaddr known - Conf-Ack */ 3446 type = CONF_ACK; 3447 3448 if (debug) { 3449 addlog(" %s [%s]", 3450 ip6_sprintf(&desiredaddr), 3451 sppp_cp_type_name(type)); 3452 } 3453 continue; 3454 } 3455 3456 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3457 if (collision && nohisaddr) { 3458 /* collision, hisaddr unknown - Conf-Rej */ 3459 type = CONF_REJ; 3460 memset(&p[2], 0, 8); 3461 } else { 3462 /* 3463 * - no collision, hisaddr unknown, or 3464 * - collision, hisaddr known 3465 * Conf-Nak, suggest hisaddr 3466 */ 3467 type = CONF_NAK; 3468 sppp_suggest_ip6_addr(sp, &suggestaddr); 3469 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3470 } 3471 if (debug) 3472 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3473 sppp_cp_type_name(type)); 3474 break; 3475 } 3476 /* Add the option to nak'ed list. */ 3477 bcopy (p, r, p[1]); 3478 r += p[1]; 3479 rlen += p[1]; 3480 } 3481 3482 if (rlen == 0 && type == CONF_ACK) { 3483 if (debug) 3484 addlog(" send %s\n", sppp_cp_type_name(type)); 3485 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3486 } else { 3487 #ifdef notdef 3488 if (type == CONF_ACK) 3489 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3490 #endif 3491 3492 if (debug) { 3493 addlog(" send %s suggest %s\n", 3494 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3495 } 3496 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3497 } 3498 3499 end: 3500 free(buf, M_TEMP); 3501 return (rlen == 0); 3502 3503 drop: 3504 free(buf, M_TEMP); 3505 return -1; 3506 } 3507 3508 /* 3509 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3510 * negotiation. 3511 */ 3512 static void 3513 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3514 { 3515 u_char *buf, *p; 3516 struct ifnet *ifp = &sp->pp_if; 3517 int debug = ifp->if_flags & IFF_DEBUG; 3518 3519 len -= 4; 3520 buf = malloc (len, M_TEMP, M_NOWAIT); 3521 if (!buf) 3522 return; 3523 3524 if (debug) 3525 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3526 ifp->if_xname); 3527 3528 p = (void *)(h + 1); 3529 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3530 if (p[1] > len) { 3531 /* XXX just RXJ? */ 3532 addlog("%s: received malicious IPCPv6 option, " 3533 "dropping\n", ifp->if_xname); 3534 goto drop; 3535 } 3536 if (debug) 3537 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3538 switch (*p) { 3539 case IPV6CP_OPT_IFID: 3540 /* 3541 * Peer doesn't grok address option. This is 3542 * bad. XXX Should we better give up here? 3543 */ 3544 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3545 break; 3546 #ifdef notyet 3547 case IPV6CP_OPT_COMPRESS: 3548 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3549 break; 3550 #endif 3551 } 3552 } 3553 if (debug) 3554 addlog("\n"); 3555 drop: 3556 free(buf, M_TEMP); 3557 return; 3558 } 3559 3560 /* 3561 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3562 * negotiation. 3563 */ 3564 static void 3565 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3566 { 3567 u_char *buf, *p; 3568 struct ifnet *ifp = &sp->pp_if; 3569 int debug = ifp->if_flags & IFF_DEBUG; 3570 struct in6_addr suggestaddr; 3571 3572 len -= 4; 3573 buf = malloc (len, M_TEMP, M_NOWAIT); 3574 if (!buf) 3575 return; 3576 3577 if (debug) 3578 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3579 ifp->if_xname); 3580 3581 p = (void *)(h + 1); 3582 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3583 if (p[1] > len) { 3584 /* XXX just RXJ? */ 3585 addlog("%s: received malicious IPCPv6 option, " 3586 "dropping\n", ifp->if_xname); 3587 goto drop; 3588 } 3589 if (debug) 3590 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3591 switch (*p) { 3592 case IPV6CP_OPT_IFID: 3593 /* 3594 * Peer doesn't like our local ifid. See 3595 * if we can do something for him. We'll drop 3596 * him our address then. 3597 */ 3598 if (len < 10 || p[1] != 10) 3599 break; 3600 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3601 suggestaddr.s6_addr16[0] = htons(0xfe80); 3602 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3603 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3604 3605 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3606 if (debug) 3607 addlog(" [suggestaddr %s]", 3608 ip6_sprintf(&suggestaddr)); 3609 #ifdef IPV6CP_MYIFID_DYN 3610 /* 3611 * When doing dynamic address assignment, 3612 * we accept his offer. 3613 */ 3614 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3615 struct in6_addr lastsuggest; 3616 /* 3617 * If <suggested myaddr from peer> equals to 3618 * <hisaddr we have suggested last time>, 3619 * we have a collision. generate new random 3620 * ifid. 3621 */ 3622 sppp_suggest_ip6_addr(&lastsuggest); 3623 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3624 lastsuggest)) { 3625 if (debug) 3626 addlog(" [random]"); 3627 sppp_gen_ip6_addr(sp, &suggestaddr); 3628 } 3629 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3630 if (debug) 3631 addlog(" [agree]"); 3632 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3633 } 3634 #else 3635 /* 3636 * Since we do not do dynamic address assignment, 3637 * we ignore it and thus continue to negotiate 3638 * our already existing value. This can possibly 3639 * go into infinite request-reject loop. 3640 * 3641 * This is not likely because we normally use 3642 * ifid based on MAC-address. 3643 * If you have no ethernet card on the node, too bad. 3644 * XXX should we use fail_counter? 3645 */ 3646 #endif 3647 break; 3648 #ifdef notyet 3649 case IPV6CP_OPT_COMPRESS: 3650 /* 3651 * Peer wants different compression parameters. 3652 */ 3653 break; 3654 #endif 3655 } 3656 } 3657 if (debug) 3658 addlog("\n"); 3659 drop: 3660 free(buf, M_TEMP); 3661 return; 3662 } 3663 3664 static void 3665 sppp_ipv6cp_tlu(struct sppp *sp) 3666 { 3667 /* we are up - notify isdn daemon */ 3668 if (sp->pp_con) 3669 sp->pp_con(sp); 3670 } 3671 3672 static void 3673 sppp_ipv6cp_tld(struct sppp *sp) 3674 { 3675 } 3676 3677 static void 3678 sppp_ipv6cp_tls(struct sppp *sp) 3679 { 3680 /* indicate to LCP that it must stay alive */ 3681 sp->lcp.protos |= (1 << IDX_IPV6CP); 3682 } 3683 3684 static void 3685 sppp_ipv6cp_tlf(struct sppp *sp) 3686 { 3687 /* we no longer need LCP */ 3688 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3689 } 3690 3691 static void 3692 sppp_ipv6cp_scr(struct sppp *sp) 3693 { 3694 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3695 struct in6_addr ouraddr; 3696 int i = 0; 3697 3698 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3699 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3700 opt[i++] = IPV6CP_OPT_IFID; 3701 opt[i++] = 10; 3702 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3703 i += 8; 3704 } 3705 3706 #ifdef notyet 3707 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3708 opt[i++] = IPV6CP_OPT_COMPRESSION; 3709 opt[i++] = 4; 3710 opt[i++] = 0; /* TBD */ 3711 opt[i++] = 0; /* TBD */ 3712 /* variable length data may follow */ 3713 } 3714 #endif 3715 3716 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3717 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3718 } 3719 #else /*INET6*/ 3720 static void 3721 sppp_ipv6cp_init(struct sppp *sp) 3722 { 3723 } 3724 3725 static void 3726 sppp_ipv6cp_up(struct sppp *sp) 3727 { 3728 } 3729 3730 static void 3731 sppp_ipv6cp_down(struct sppp *sp) 3732 { 3733 } 3734 3735 static void 3736 sppp_ipv6cp_open(struct sppp *sp) 3737 { 3738 } 3739 3740 static void 3741 sppp_ipv6cp_close(struct sppp *sp) 3742 { 3743 } 3744 3745 static void 3746 sppp_ipv6cp_TO(void *sp) 3747 { 3748 } 3749 3750 static int 3751 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3752 int len) 3753 { 3754 return 0; 3755 } 3756 3757 static void 3758 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3759 int len) 3760 { 3761 } 3762 3763 static void 3764 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3765 int len) 3766 { 3767 } 3768 3769 static void 3770 sppp_ipv6cp_tlu(struct sppp *sp) 3771 { 3772 } 3773 3774 static void 3775 sppp_ipv6cp_tld(struct sppp *sp) 3776 { 3777 } 3778 3779 static void 3780 sppp_ipv6cp_tls(struct sppp *sp) 3781 { 3782 } 3783 3784 static void 3785 sppp_ipv6cp_tlf(struct sppp *sp) 3786 { 3787 } 3788 3789 static void 3790 sppp_ipv6cp_scr(struct sppp *sp) 3791 { 3792 } 3793 #endif /*INET6*/ 3794 3795 3796 /* 3797 *--------------------------------------------------------------------------* 3798 * * 3799 * The CHAP implementation. * 3800 * * 3801 *--------------------------------------------------------------------------* 3802 */ 3803 3804 /* 3805 * The authentication protocols don't employ a full-fledged state machine as 3806 * the control protocols do, since they do have Open and Close events, but 3807 * not Up and Down, nor are they explicitly terminated. Also, use of the 3808 * authentication protocols may be different in both directions (this makes 3809 * sense, think of a machine that never accepts incoming calls but only 3810 * calls out, it doesn't require the called party to authenticate itself). 3811 * 3812 * Our state machine for the local authentication protocol (we are requesting 3813 * the peer to authenticate) looks like: 3814 * 3815 * RCA- 3816 * +--------------------------------------------+ 3817 * V scn,tld| 3818 * +--------+ Close +---------+ RCA+ 3819 * | |<----------------------------------| |------+ 3820 * +--->| Closed | TO* | Opened | sca | 3821 * | | |-----+ +-------| |<-----+ 3822 * | +--------+ irc | | +---------+ 3823 * | ^ | | ^ 3824 * | | | | | 3825 * | | | | | 3826 * | TO-| | | | 3827 * | |tld TO+ V | | 3828 * | | +------->+ | | 3829 * | | | | | | 3830 * | +--------+ V | | 3831 * | | |<----+<--------------------+ | 3832 * | | Req- | scr | 3833 * | | Sent | | 3834 * | | | | 3835 * | +--------+ | 3836 * | RCA- | | RCA+ | 3837 * +------+ +------------------------------------------+ 3838 * scn,tld sca,irc,ict,tlu 3839 * 3840 * 3841 * with: 3842 * 3843 * Open: LCP reached authentication phase 3844 * Close: LCP reached terminate phase 3845 * 3846 * RCA+: received reply (pap-req, chap-response), acceptable 3847 * RCN: received reply (pap-req, chap-response), not acceptable 3848 * TO+: timeout with restart counter >= 0 3849 * TO-: timeout with restart counter < 0 3850 * TO*: reschedule timeout for CHAP 3851 * 3852 * scr: send request packet (none for PAP, chap-challenge) 3853 * sca: send ack packet (pap-ack, chap-success) 3854 * scn: send nak packet (pap-nak, chap-failure) 3855 * ict: initialize re-challenge timer (CHAP only) 3856 * 3857 * tlu: this-layer-up, LCP reaches network phase 3858 * tld: this-layer-down, LCP enters terminate phase 3859 * 3860 * Note that in CHAP mode, after sending a new challenge, while the state 3861 * automaton falls back into Req-Sent state, it doesn't signal a tld 3862 * event to LCP, so LCP remains in network phase. Only after not getting 3863 * any response (or after getting an unacceptable response), CHAP closes, 3864 * causing LCP to enter terminate phase. 3865 * 3866 * With PAP, there is no initial request that can be sent. The peer is 3867 * expected to send one based on the successful negotiation of PAP as 3868 * the authentication protocol during the LCP option negotiation. 3869 * 3870 * Incoming authentication protocol requests (remote requests 3871 * authentication, we are peer) don't employ a state machine at all, 3872 * they are simply answered. Some peers [Ascend P50 firmware rev 3873 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3874 * still in authentication phase (thereby violating the standard that 3875 * demands that these NCP packets are to be discarded), so we keep 3876 * track of the peer demanding us to authenticate, and only proceed to 3877 * phase network once we've seen a positive acknowledge for the 3878 * authentication. 3879 */ 3880 3881 /* 3882 * Handle incoming CHAP packets. 3883 */ 3884 void 3885 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3886 { 3887 STDDCL; 3888 struct lcp_header *h; 3889 int len, x; 3890 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3891 int value_len, name_len; 3892 MD5_CTX ctx; 3893 3894 len = m->m_pkthdr.len; 3895 if (len < 4) { 3896 if (debug) 3897 log(LOG_DEBUG, 3898 "%s: chap invalid packet length: %d bytes\n", 3899 ifp->if_xname, len); 3900 return; 3901 } 3902 h = mtod(m, struct lcp_header *); 3903 if (len > ntohs(h->len)) 3904 len = ntohs(h->len); 3905 3906 switch (h->type) { 3907 /* challenge, failure and success are his authproto */ 3908 case CHAP_CHALLENGE: 3909 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3910 /* can't do anything usefull */ 3911 sp->pp_auth_failures++; 3912 printf("%s: chap input without my name and my secret being set\n", 3913 ifp->if_xname); 3914 break; 3915 } 3916 value = 1 + (u_char *)(h + 1); 3917 value_len = value[-1]; 3918 name = value + value_len; 3919 name_len = len - value_len - 5; 3920 if (name_len < 0) { 3921 if (debug) { 3922 log(LOG_DEBUG, 3923 "%s: chap corrupted challenge " 3924 "<%s id=0x%x len=%d", 3925 ifp->if_xname, 3926 sppp_auth_type_name(PPP_CHAP, h->type), 3927 h->ident, ntohs(h->len)); 3928 if (len > 4) 3929 sppp_print_bytes((u_char *)(h + 1), 3930 len - 4); 3931 addlog(">\n"); 3932 } 3933 break; 3934 } 3935 3936 if (debug) { 3937 log(LOG_DEBUG, 3938 "%s: chap input <%s id=0x%x len=%d name=", 3939 ifp->if_xname, 3940 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3941 ntohs(h->len)); 3942 sppp_print_string((char *) name, name_len); 3943 addlog(" value-size=%d value=", value_len); 3944 sppp_print_bytes(value, value_len); 3945 addlog(">\n"); 3946 } 3947 3948 /* Compute reply value. */ 3949 MD5Init(&ctx); 3950 MD5Update(&ctx, &h->ident, 1); 3951 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3952 MD5Update(&ctx, value, value_len); 3953 MD5Final(digest, &ctx); 3954 dsize = sizeof digest; 3955 3956 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3957 sizeof dsize, (const char *)&dsize, 3958 sizeof digest, digest, 3959 sp->myauth.name_len, 3960 sp->myauth.name, 3961 0); 3962 break; 3963 3964 case CHAP_SUCCESS: 3965 if (debug) { 3966 log(LOG_DEBUG, "%s: chap success", 3967 ifp->if_xname); 3968 if (len > 4) { 3969 addlog(": "); 3970 sppp_print_string((char *)(h + 1), len - 4); 3971 } 3972 addlog("\n"); 3973 } 3974 x = splnet(); 3975 sp->pp_auth_failures = 0; 3976 sp->pp_flags &= ~PP_NEEDAUTH; 3977 if (sp->myauth.proto == PPP_CHAP && 3978 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3979 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3980 /* 3981 * We are authenticator for CHAP but didn't 3982 * complete yet. Leave it to tlu to proceed 3983 * to network phase. 3984 */ 3985 splx(x); 3986 break; 3987 } 3988 splx(x); 3989 sppp_phase_network(sp); 3990 break; 3991 3992 case CHAP_FAILURE: 3993 x = splnet(); 3994 sp->pp_auth_failures++; 3995 splx(x); 3996 if (debug) { 3997 log(LOG_INFO, "%s: chap failure", 3998 ifp->if_xname); 3999 if (len > 4) { 4000 addlog(": "); 4001 sppp_print_string((char *)(h + 1), len - 4); 4002 } 4003 addlog("\n"); 4004 } else 4005 log(LOG_INFO, "%s: chap failure\n", 4006 ifp->if_xname); 4007 /* await LCP shutdown by authenticator */ 4008 break; 4009 4010 /* response is my authproto */ 4011 case CHAP_RESPONSE: 4012 if (sp->hisauth.secret == NULL) { 4013 /* can't do anything usefull */ 4014 printf("%s: chap input without his secret being set\n", 4015 ifp->if_xname); 4016 break; 4017 } 4018 value = 1 + (u_char *)(h + 1); 4019 value_len = value[-1]; 4020 name = value + value_len; 4021 name_len = len - value_len - 5; 4022 if (name_len < 0) { 4023 if (debug) { 4024 log(LOG_DEBUG, 4025 "%s: chap corrupted response " 4026 "<%s id=0x%x len=%d", 4027 ifp->if_xname, 4028 sppp_auth_type_name(PPP_CHAP, h->type), 4029 h->ident, ntohs(h->len)); 4030 if (len > 4) 4031 sppp_print_bytes((u_char *)(h + 1), 4032 len - 4); 4033 addlog(">\n"); 4034 } 4035 break; 4036 } 4037 if (h->ident != sp->confid[IDX_CHAP]) { 4038 if (debug) 4039 log(LOG_DEBUG, 4040 "%s: chap dropping response for old ID " 4041 "(got %d, expected %d)\n", 4042 ifp->if_xname, 4043 h->ident, sp->confid[IDX_CHAP]); 4044 break; 4045 } 4046 if (sp->hisauth.name != NULL && 4047 (name_len != sp->hisauth.name_len 4048 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4049 log(LOG_INFO, "%s: chap response, his name ", 4050 ifp->if_xname); 4051 sppp_print_string(name, name_len); 4052 addlog(" != expected "); 4053 sppp_print_string(sp->hisauth.name, 4054 sp->hisauth.name_len); 4055 addlog("\n"); 4056 goto chap_failure; 4057 } 4058 if (debug) { 4059 log(LOG_DEBUG, "%s: chap input(%s) " 4060 "<%s id=0x%x len=%d name=", 4061 ifp->if_xname, 4062 sppp_state_name(sp->state[IDX_CHAP]), 4063 sppp_auth_type_name(PPP_CHAP, h->type), 4064 h->ident, ntohs(h->len)); 4065 sppp_print_string((char *)name, name_len); 4066 addlog(" value-size=%d value=", value_len); 4067 sppp_print_bytes(value, value_len); 4068 addlog(">\n"); 4069 } 4070 if (value_len != sizeof(sp->myauth.challenge)) { 4071 if (debug) 4072 log(LOG_DEBUG, 4073 "%s: chap bad hash value length: " 4074 "%d bytes, should be %ld\n", 4075 ifp->if_xname, value_len, 4076 (long) sizeof(sp->myauth.challenge)); 4077 goto chap_failure; 4078 } 4079 4080 MD5Init(&ctx); 4081 MD5Update(&ctx, &h->ident, 1); 4082 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4083 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4084 MD5Final(digest, &ctx); 4085 4086 #define FAILMSG "Failed..." 4087 #define SUCCMSG "Welcome!" 4088 4089 if (value_len != sizeof digest || 4090 memcmp(digest, value, value_len) != 0) { 4091 chap_failure: 4092 /* action scn, tld */ 4093 x = splnet(); 4094 sp->pp_auth_failures++; 4095 splx(x); 4096 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4097 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4098 0); 4099 chap.tld(sp); 4100 break; 4101 } 4102 sp->pp_auth_failures = 0; 4103 /* action sca, perhaps tlu */ 4104 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4105 sp->state[IDX_CHAP] == STATE_OPENED) 4106 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4107 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4108 0); 4109 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4110 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4111 chap.tlu(sp); 4112 } 4113 break; 4114 4115 default: 4116 /* Unknown CHAP packet type -- ignore. */ 4117 if (debug) { 4118 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4119 "<0x%x id=0x%xh len=%d", 4120 ifp->if_xname, 4121 sppp_state_name(sp->state[IDX_CHAP]), 4122 h->type, h->ident, ntohs(h->len)); 4123 if (len > 4) 4124 sppp_print_bytes((u_char *)(h + 1), len - 4); 4125 addlog(">\n"); 4126 } 4127 break; 4128 4129 } 4130 } 4131 4132 static void 4133 sppp_chap_init(struct sppp *sp) 4134 { 4135 /* Chap doesn't have STATE_INITIAL at all. */ 4136 sp->state[IDX_CHAP] = STATE_CLOSED; 4137 sp->fail_counter[IDX_CHAP] = 0; 4138 sp->pp_seq[IDX_CHAP] = 0; 4139 sp->pp_rseq[IDX_CHAP] = 0; 4140 callout_init(&sp->ch[IDX_CHAP], 0); 4141 } 4142 4143 static void 4144 sppp_chap_open(struct sppp *sp) 4145 { 4146 if (sp->myauth.proto == PPP_CHAP && 4147 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4148 /* we are authenticator for CHAP, start it */ 4149 chap.scr(sp); 4150 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4151 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4152 } 4153 /* nothing to be done if we are peer, await a challenge */ 4154 } 4155 4156 static void 4157 sppp_chap_close(struct sppp *sp) 4158 { 4159 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4160 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4161 } 4162 4163 static void 4164 sppp_chap_TO(void *cookie) 4165 { 4166 struct sppp *sp = (struct sppp *)cookie; 4167 STDDCL; 4168 int s; 4169 4170 s = splnet(); 4171 if (debug) 4172 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4173 ifp->if_xname, 4174 sppp_state_name(sp->state[IDX_CHAP]), 4175 sp->rst_counter[IDX_CHAP]); 4176 4177 if (--sp->rst_counter[IDX_CHAP] < 0) 4178 /* TO- event */ 4179 switch (sp->state[IDX_CHAP]) { 4180 case STATE_REQ_SENT: 4181 chap.tld(sp); 4182 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4183 break; 4184 } 4185 else 4186 /* TO+ (or TO*) event */ 4187 switch (sp->state[IDX_CHAP]) { 4188 case STATE_OPENED: 4189 /* TO* event */ 4190 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4191 /* fall through */ 4192 case STATE_REQ_SENT: 4193 chap.scr(sp); 4194 /* sppp_cp_change_state() will restart the timer */ 4195 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4196 break; 4197 } 4198 4199 splx(s); 4200 } 4201 4202 static void 4203 sppp_chap_tlu(struct sppp *sp) 4204 { 4205 STDDCL; 4206 int i, x; 4207 4208 i = 0; 4209 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4210 4211 /* 4212 * Some broken CHAP implementations (Conware CoNet, firmware 4213 * 4.0.?) don't want to re-authenticate their CHAP once the 4214 * initial challenge-response exchange has taken place. 4215 * Provide for an option to avoid rechallenges. 4216 */ 4217 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4218 /* 4219 * Compute the re-challenge timeout. This will yield 4220 * a number between 300 and 810 seconds. 4221 */ 4222 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4223 4224 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4225 } 4226 4227 if (debug) { 4228 log(LOG_DEBUG, 4229 "%s: chap %s, ", 4230 ifp->if_xname, 4231 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4232 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4233 addlog("next re-challenge in %d seconds\n", i); 4234 else 4235 addlog("re-challenging supressed\n"); 4236 } 4237 4238 x = splnet(); 4239 sp->pp_auth_failures = 0; 4240 /* indicate to LCP that we need to be closed down */ 4241 sp->lcp.protos |= (1 << IDX_CHAP); 4242 4243 if (sp->pp_flags & PP_NEEDAUTH) { 4244 /* 4245 * Remote is authenticator, but his auth proto didn't 4246 * complete yet. Defer the transition to network 4247 * phase. 4248 */ 4249 splx(x); 4250 return; 4251 } 4252 splx(x); 4253 4254 /* 4255 * If we are already in phase network, we are done here. This 4256 * is the case if this is a dummy tlu event after a re-challenge. 4257 */ 4258 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4259 sppp_phase_network(sp); 4260 } 4261 4262 static void 4263 sppp_chap_tld(struct sppp *sp) 4264 { 4265 STDDCL; 4266 4267 if (debug) 4268 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4269 callout_stop(&sp->ch[IDX_CHAP]); 4270 sp->lcp.protos &= ~(1 << IDX_CHAP); 4271 4272 lcp.Close(sp); 4273 } 4274 4275 static void 4276 sppp_chap_scr(struct sppp *sp) 4277 { 4278 uint32_t *ch; 4279 u_char clen; 4280 4281 if (sp->myauth.name == NULL) { 4282 /* can't do anything usefull */ 4283 printf("%s: chap starting without my name being set\n", 4284 sp->pp_if.if_xname); 4285 return; 4286 } 4287 4288 /* Compute random challenge. */ 4289 ch = (uint32_t *)sp->myauth.challenge; 4290 ch[0] = arc4random(); 4291 ch[1] = arc4random(); 4292 ch[2] = arc4random(); 4293 ch[3] = arc4random(); 4294 clen = 16; /* 4 * sizeof(uint32_t) */ 4295 4296 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4297 4298 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4299 sizeof clen, (const char *)&clen, 4300 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4301 sp->myauth.name_len, 4302 sp->myauth.name, 4303 0); 4304 } 4305 4306 /* 4307 *--------------------------------------------------------------------------* 4308 * * 4309 * The PAP implementation. * 4310 * * 4311 *--------------------------------------------------------------------------* 4312 */ 4313 /* 4314 * For PAP, we need to keep a little state also if we are the peer, not the 4315 * authenticator. This is since we don't get a request to authenticate, but 4316 * have to repeatedly authenticate ourself until we got a response (or the 4317 * retry counter is expired). 4318 */ 4319 4320 /* 4321 * Handle incoming PAP packets. */ 4322 static void 4323 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4324 { 4325 STDDCL; 4326 struct lcp_header *h; 4327 int len, x; 4328 u_char mlen; 4329 char *name, *secret; 4330 int name_len, secret_len; 4331 4332 /* 4333 * Malicious input might leave this uninitialized, so 4334 * init to an impossible value. 4335 */ 4336 secret_len = -1; 4337 4338 len = m->m_pkthdr.len; 4339 if (len < 5) { 4340 if (debug) 4341 log(LOG_DEBUG, 4342 "%s: pap invalid packet length: %d bytes\n", 4343 ifp->if_xname, len); 4344 return; 4345 } 4346 h = mtod(m, struct lcp_header *); 4347 if (len > ntohs(h->len)) 4348 len = ntohs(h->len); 4349 switch (h->type) { 4350 /* PAP request is my authproto */ 4351 case PAP_REQ: 4352 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4353 /* can't do anything usefull */ 4354 printf("%s: pap request without his name and his secret being set\n", 4355 ifp->if_xname); 4356 break; 4357 } 4358 name = 1 + (u_char *)(h + 1); 4359 name_len = name[-1]; 4360 secret = name + name_len + 1; 4361 if (name_len > len - 6 || 4362 (secret_len = secret[-1]) > len - 6 - name_len) { 4363 if (debug) { 4364 log(LOG_DEBUG, "%s: pap corrupted input " 4365 "<%s id=0x%x len=%d", 4366 ifp->if_xname, 4367 sppp_auth_type_name(PPP_PAP, h->type), 4368 h->ident, ntohs(h->len)); 4369 if (len > 4) 4370 sppp_print_bytes((u_char *)(h + 1), 4371 len - 4); 4372 addlog(">\n"); 4373 } 4374 break; 4375 } 4376 if (debug) { 4377 log(LOG_DEBUG, "%s: pap input(%s) " 4378 "<%s id=0x%x len=%d name=", 4379 ifp->if_xname, 4380 sppp_state_name(sp->state[IDX_PAP]), 4381 sppp_auth_type_name(PPP_PAP, h->type), 4382 h->ident, ntohs(h->len)); 4383 sppp_print_string((char *)name, name_len); 4384 addlog(" secret="); 4385 sppp_print_string((char *)secret, secret_len); 4386 addlog(">\n"); 4387 } 4388 if (name_len != sp->hisauth.name_len || 4389 secret_len != sp->hisauth.secret_len || 4390 memcmp(name, sp->hisauth.name, name_len) != 0 || 4391 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4392 /* action scn, tld */ 4393 sp->pp_auth_failures++; 4394 mlen = sizeof(FAILMSG) - 1; 4395 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4396 sizeof mlen, (const char *)&mlen, 4397 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4398 0); 4399 pap.tld(sp); 4400 break; 4401 } 4402 /* action sca, perhaps tlu */ 4403 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4404 sp->state[IDX_PAP] == STATE_OPENED) { 4405 mlen = sizeof(SUCCMSG) - 1; 4406 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4407 sizeof mlen, (const char *)&mlen, 4408 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4409 0); 4410 } 4411 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4412 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4413 pap.tlu(sp); 4414 } 4415 break; 4416 4417 /* ack and nak are his authproto */ 4418 case PAP_ACK: 4419 callout_stop(&sp->pap_my_to_ch); 4420 if (debug) { 4421 log(LOG_DEBUG, "%s: pap success", 4422 ifp->if_xname); 4423 name = 1 + (u_char *)(h + 1); 4424 name_len = name[-1]; 4425 if (len > 5 && name_len < len+4) { 4426 addlog(": "); 4427 sppp_print_string(name, name_len); 4428 } 4429 addlog("\n"); 4430 } 4431 x = splnet(); 4432 sp->pp_auth_failures = 0; 4433 sp->pp_flags &= ~PP_NEEDAUTH; 4434 if (sp->myauth.proto == PPP_PAP && 4435 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4436 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4437 /* 4438 * We are authenticator for PAP but didn't 4439 * complete yet. Leave it to tlu to proceed 4440 * to network phase. 4441 */ 4442 splx(x); 4443 break; 4444 } 4445 splx(x); 4446 sppp_phase_network(sp); 4447 break; 4448 4449 case PAP_NAK: 4450 callout_stop(&sp->pap_my_to_ch); 4451 sp->pp_auth_failures++; 4452 if (debug) { 4453 log(LOG_INFO, "%s: pap failure", 4454 ifp->if_xname); 4455 name = 1 + (u_char *)(h + 1); 4456 name_len = name[-1]; 4457 if (len > 5 && name_len < len+4) { 4458 addlog(": "); 4459 sppp_print_string(name, name_len); 4460 } 4461 addlog("\n"); 4462 } else 4463 log(LOG_INFO, "%s: pap failure\n", 4464 ifp->if_xname); 4465 /* await LCP shutdown by authenticator */ 4466 break; 4467 4468 default: 4469 /* Unknown PAP packet type -- ignore. */ 4470 if (debug) { 4471 log(LOG_DEBUG, "%s: pap corrupted input " 4472 "<0x%x id=0x%x len=%d", 4473 ifp->if_xname, 4474 h->type, h->ident, ntohs(h->len)); 4475 if (len > 4) 4476 sppp_print_bytes((u_char *)(h + 1), len - 4); 4477 addlog(">\n"); 4478 } 4479 break; 4480 4481 } 4482 } 4483 4484 static void 4485 sppp_pap_init(struct sppp *sp) 4486 { 4487 /* PAP doesn't have STATE_INITIAL at all. */ 4488 sp->state[IDX_PAP] = STATE_CLOSED; 4489 sp->fail_counter[IDX_PAP] = 0; 4490 sp->pp_seq[IDX_PAP] = 0; 4491 sp->pp_rseq[IDX_PAP] = 0; 4492 callout_init(&sp->ch[IDX_PAP], 0); 4493 callout_init(&sp->pap_my_to_ch, 0); 4494 } 4495 4496 static void 4497 sppp_pap_open(struct sppp *sp) 4498 { 4499 if (sp->hisauth.proto == PPP_PAP && 4500 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4501 /* we are authenticator for PAP, start our timer */ 4502 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4503 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4504 } 4505 if (sp->myauth.proto == PPP_PAP) { 4506 /* we are peer, send a request, and start a timer */ 4507 pap.scr(sp); 4508 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4509 sppp_pap_my_TO, sp); 4510 } 4511 } 4512 4513 static void 4514 sppp_pap_close(struct sppp *sp) 4515 { 4516 if (sp->state[IDX_PAP] != STATE_CLOSED) 4517 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4518 } 4519 4520 /* 4521 * That's the timeout routine if we are authenticator. Since the 4522 * authenticator is basically passive in PAP, we can't do much here. 4523 */ 4524 static void 4525 sppp_pap_TO(void *cookie) 4526 { 4527 struct sppp *sp = (struct sppp *)cookie; 4528 STDDCL; 4529 int s; 4530 4531 s = splnet(); 4532 if (debug) 4533 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4534 ifp->if_xname, 4535 sppp_state_name(sp->state[IDX_PAP]), 4536 sp->rst_counter[IDX_PAP]); 4537 4538 if (--sp->rst_counter[IDX_PAP] < 0) 4539 /* TO- event */ 4540 switch (sp->state[IDX_PAP]) { 4541 case STATE_REQ_SENT: 4542 pap.tld(sp); 4543 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4544 break; 4545 } 4546 else 4547 /* TO+ event, not very much we could do */ 4548 switch (sp->state[IDX_PAP]) { 4549 case STATE_REQ_SENT: 4550 /* sppp_cp_change_state() will restart the timer */ 4551 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4552 break; 4553 } 4554 4555 splx(s); 4556 } 4557 4558 /* 4559 * That's the timeout handler if we are peer. Since the peer is active, 4560 * we need to retransmit our PAP request since it is apparently lost. 4561 * XXX We should impose a max counter. 4562 */ 4563 static void 4564 sppp_pap_my_TO(void *cookie) 4565 { 4566 struct sppp *sp = (struct sppp *)cookie; 4567 STDDCL; 4568 4569 if (debug) 4570 log(LOG_DEBUG, "%s: pap peer TO\n", 4571 ifp->if_xname); 4572 4573 pap.scr(sp); 4574 } 4575 4576 static void 4577 sppp_pap_tlu(struct sppp *sp) 4578 { 4579 STDDCL; 4580 int x; 4581 4582 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4583 4584 if (debug) 4585 log(LOG_DEBUG, "%s: %s tlu\n", 4586 ifp->if_xname, pap.name); 4587 4588 x = splnet(); 4589 sp->pp_auth_failures = 0; 4590 /* indicate to LCP that we need to be closed down */ 4591 sp->lcp.protos |= (1 << IDX_PAP); 4592 4593 if (sp->pp_flags & PP_NEEDAUTH) { 4594 /* 4595 * Remote is authenticator, but his auth proto didn't 4596 * complete yet. Defer the transition to network 4597 * phase. 4598 */ 4599 splx(x); 4600 return; 4601 } 4602 splx(x); 4603 sppp_phase_network(sp); 4604 } 4605 4606 static void 4607 sppp_pap_tld(struct sppp *sp) 4608 { 4609 STDDCL; 4610 4611 if (debug) 4612 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4613 callout_stop(&sp->ch[IDX_PAP]); 4614 callout_stop(&sp->pap_my_to_ch); 4615 sp->lcp.protos &= ~(1 << IDX_PAP); 4616 4617 lcp.Close(sp); 4618 } 4619 4620 static void 4621 sppp_pap_scr(struct sppp *sp) 4622 { 4623 u_char idlen, pwdlen; 4624 4625 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4626 /* can't do anything usefull */ 4627 printf("%s: pap starting without my name and secret being set\n", 4628 sp->pp_if.if_xname); 4629 return; 4630 } 4631 4632 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4633 pwdlen = sp->myauth.secret_len; 4634 idlen = sp->myauth.name_len; 4635 4636 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4637 sizeof idlen, (const char *)&idlen, 4638 idlen, sp->myauth.name, 4639 sizeof pwdlen, (const char *)&pwdlen, 4640 pwdlen, sp->myauth.secret, 4641 0); 4642 } 4643 4644 /* 4645 * Random miscellaneous functions. 4646 */ 4647 4648 /* 4649 * Send a PAP or CHAP proto packet. 4650 * 4651 * Varadic function, each of the elements for the ellipsis is of type 4652 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4653 * mlen == 0. 4654 * NOTE: never declare variadic functions with types subject to type 4655 * promotion (i.e. u_char). This is asking for big trouble depending 4656 * on the architecture you are on... 4657 */ 4658 4659 static void 4660 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4661 unsigned int type, unsigned int id, 4662 ...) 4663 { 4664 STDDCL; 4665 struct lcp_header *lh; 4666 struct mbuf *m; 4667 u_char *p; 4668 int len; 4669 size_t pkthdrlen; 4670 unsigned int mlen; 4671 const char *msg; 4672 va_list ap; 4673 4674 MGETHDR(m, M_DONTWAIT, MT_DATA); 4675 if (! m) 4676 return; 4677 m->m_pkthdr.rcvif = 0; 4678 4679 if (sp->pp_flags & PP_NOFRAMING) { 4680 *mtod(m, uint16_t *) = htons(cp->proto); 4681 pkthdrlen = 2; 4682 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4683 } else { 4684 struct ppp_header *h; 4685 h = mtod(m, struct ppp_header *); 4686 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4687 h->control = PPP_UI; /* Unnumbered Info */ 4688 h->protocol = htons(cp->proto); 4689 pkthdrlen = PPP_HEADER_LEN; 4690 4691 lh = (struct lcp_header *)(h + 1); 4692 } 4693 4694 lh->type = type; 4695 lh->ident = id; 4696 p = (u_char *)(lh + 1); 4697 4698 va_start(ap, id); 4699 len = 0; 4700 4701 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4702 msg = va_arg(ap, const char *); 4703 len += mlen; 4704 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4705 va_end(ap); 4706 m_freem(m); 4707 return; 4708 } 4709 4710 bcopy(msg, p, mlen); 4711 p += mlen; 4712 } 4713 va_end(ap); 4714 4715 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4716 lh->len = htons(LCP_HEADER_LEN + len); 4717 4718 if (debug) { 4719 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4720 ifp->if_xname, cp->name, 4721 sppp_auth_type_name(cp->proto, lh->type), 4722 lh->ident, ntohs(lh->len)); 4723 if (len) 4724 sppp_print_bytes((u_char *)(lh + 1), len); 4725 addlog(">\n"); 4726 } 4727 if (IF_QFULL(&sp->pp_cpq)) { 4728 IF_DROP(&sp->pp_fastq); 4729 IF_DROP(&ifp->if_snd); 4730 m_freem(m); 4731 ++ifp->if_oerrors; 4732 return; 4733 } else 4734 IF_ENQUEUE(&sp->pp_cpq, m); 4735 if (! (ifp->if_flags & IFF_OACTIVE)) 4736 (*ifp->if_start)(ifp); 4737 ifp->if_obytes += m->m_pkthdr.len + 3; 4738 } 4739 4740 /* 4741 * Send keepalive packets, every 10 seconds. 4742 */ 4743 static void 4744 sppp_keepalive(void *dummy) 4745 { 4746 struct sppp *sp; 4747 int s; 4748 time_t now; 4749 4750 s = splnet(); 4751 now = time_uptime; 4752 for (sp=spppq; sp; sp=sp->pp_next) { 4753 struct ifnet *ifp = &sp->pp_if; 4754 4755 /* check idle timeout */ 4756 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4757 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4758 /* idle timeout is enabled for this interface */ 4759 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4760 if (ifp->if_flags & IFF_DEBUG) 4761 printf("%s: no activity for %lu seconds\n", 4762 sp->pp_if.if_xname, 4763 (unsigned long)(now-sp->pp_last_activity)); 4764 lcp.Close(sp); 4765 continue; 4766 } 4767 } 4768 4769 /* Keepalive mode disabled or channel down? */ 4770 if (! (sp->pp_flags & PP_KEEPALIVE) || 4771 ! (ifp->if_flags & IFF_RUNNING)) 4772 continue; 4773 4774 /* No keepalive in PPP mode if LCP not opened yet. */ 4775 if (! (sp->pp_flags & PP_CISCO) && 4776 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4777 continue; 4778 4779 /* No echo reply, but maybe user data passed through? */ 4780 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4781 sp->pp_alivecnt = 0; 4782 continue; 4783 } 4784 4785 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4786 /* No keepalive packets got. Stop the interface. */ 4787 if_down (ifp); 4788 IF_PURGE(&sp->pp_cpq); 4789 if (! (sp->pp_flags & PP_CISCO)) { 4790 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4791 ifp->if_xname); 4792 sp->pp_alivecnt = 0; 4793 4794 /* we are down, close all open protocols */ 4795 lcp.Close(sp); 4796 4797 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4798 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4799 4800 /* Close connection immediately, completition of this 4801 * will summon the magic needed to reestablish it. */ 4802 if (sp->pp_tlf) 4803 sp->pp_tlf(sp); 4804 continue; 4805 } 4806 } 4807 if (sp->pp_alivecnt < sp->pp_maxalive) 4808 ++sp->pp_alivecnt; 4809 if (sp->pp_flags & PP_CISCO) 4810 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4811 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4812 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4813 int32_t nmagic = htonl(sp->lcp.magic); 4814 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4815 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4816 sp->lcp.echoid, 4, &nmagic); 4817 } 4818 } 4819 splx(s); 4820 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4821 } 4822 4823 #ifdef INET 4824 /* 4825 * Get both IP addresses. 4826 */ 4827 static void 4828 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4829 { 4830 struct ifnet *ifp = &sp->pp_if; 4831 struct ifaddr *ifa; 4832 struct sockaddr_in *si, *sm; 4833 uint32_t ssrc, ddst; 4834 4835 sm = NULL; 4836 ssrc = ddst = 0; 4837 /* 4838 * Pick the first AF_INET address from the list, 4839 * aliases don't make any sense on a p2p link anyway. 4840 */ 4841 si = 0; 4842 IFADDR_FOREACH(ifa, ifp) { 4843 if (ifa->ifa_addr->sa_family == AF_INET) { 4844 si = (struct sockaddr_in *)ifa->ifa_addr; 4845 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4846 if (si) 4847 break; 4848 } 4849 } 4850 if (ifa) { 4851 if (si && si->sin_addr.s_addr) { 4852 ssrc = si->sin_addr.s_addr; 4853 if (srcmask) 4854 *srcmask = ntohl(sm->sin_addr.s_addr); 4855 } 4856 4857 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4858 if (si && si->sin_addr.s_addr) 4859 ddst = si->sin_addr.s_addr; 4860 } 4861 4862 if (dst) *dst = ntohl(ddst); 4863 if (src) *src = ntohl(ssrc); 4864 } 4865 4866 /* 4867 * Set IP addresses. Must be called at splnet. 4868 * If an address is 0, leave it the way it is. 4869 */ 4870 static void 4871 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4872 { 4873 STDDCL; 4874 struct ifaddr *ifa; 4875 struct sockaddr_in *si, *dest; 4876 4877 /* 4878 * Pick the first AF_INET address from the list, 4879 * aliases don't make any sense on a p2p link anyway. 4880 */ 4881 4882 IFADDR_FOREACH(ifa, ifp) { 4883 if (ifa->ifa_addr->sa_family == AF_INET) { 4884 si = (struct sockaddr_in *)ifa->ifa_addr; 4885 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4886 goto found; 4887 } 4888 } 4889 return; 4890 4891 found: 4892 { 4893 int error; 4894 struct sockaddr_in new_sin = *si; 4895 struct sockaddr_in new_dst = *dest; 4896 4897 /* 4898 * Scrub old routes now instead of calling in_ifinit with 4899 * scrub=1, because we may change the dstaddr 4900 * before the call to in_ifinit. 4901 */ 4902 in_ifscrub(ifp, ifatoia(ifa)); 4903 4904 if (myaddr != 0) 4905 new_sin.sin_addr.s_addr = htonl(myaddr); 4906 if (hisaddr != 0) { 4907 new_dst.sin_addr.s_addr = htonl(hisaddr); 4908 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4909 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4910 *dest = new_dst; /* fix dstaddr in place */ 4911 } 4912 } 4913 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4914 if (debug && error) 4915 { 4916 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4917 " failed, error=%d\n", ifp->if_xname, error); 4918 } 4919 #ifdef PFIL_HOOKS 4920 if (!error) 4921 (void)pfil_run_hooks(&if_pfil, 4922 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4923 #endif 4924 } 4925 } 4926 4927 /* 4928 * Clear IP addresses. Must be called at splnet. 4929 */ 4930 static void 4931 sppp_clear_ip_addrs(struct sppp *sp) 4932 { 4933 struct ifnet *ifp = &sp->pp_if; 4934 struct ifaddr *ifa; 4935 struct sockaddr_in *si, *dest; 4936 4937 uint32_t remote; 4938 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4939 remote = sp->ipcp.saved_hisaddr; 4940 else 4941 sppp_get_ip_addrs(sp, 0, &remote, 0); 4942 4943 /* 4944 * Pick the first AF_INET address from the list, 4945 * aliases don't make any sense on a p2p link anyway. 4946 */ 4947 4948 IFADDR_FOREACH(ifa, ifp) { 4949 if (ifa->ifa_addr->sa_family == AF_INET) { 4950 si = (struct sockaddr_in *)ifa->ifa_addr; 4951 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4952 goto found; 4953 } 4954 } 4955 return; 4956 4957 found: 4958 { 4959 struct sockaddr_in new_sin = *si; 4960 4961 in_ifscrub(ifp, ifatoia(ifa)); 4962 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4963 new_sin.sin_addr.s_addr = 0; 4964 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4965 /* replace peer addr in place */ 4966 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4967 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4968 #ifdef PFIL_HOOKS 4969 (void)pfil_run_hooks(&if_pfil, 4970 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4971 #endif 4972 } 4973 } 4974 #endif 4975 4976 #ifdef INET6 4977 /* 4978 * Get both IPv6 addresses. 4979 */ 4980 static void 4981 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4982 struct in6_addr *srcmask) 4983 { 4984 struct ifnet *ifp = &sp->pp_if; 4985 struct ifaddr *ifa; 4986 struct sockaddr_in6 *si, *sm; 4987 struct in6_addr ssrc, ddst; 4988 4989 sm = NULL; 4990 memset(&ssrc, 0, sizeof(ssrc)); 4991 memset(&ddst, 0, sizeof(ddst)); 4992 /* 4993 * Pick the first link-local AF_INET6 address from the list, 4994 * aliases don't make any sense on a p2p link anyway. 4995 */ 4996 si = 0; 4997 IFADDR_FOREACH(ifa, ifp) 4998 if (ifa->ifa_addr->sa_family == AF_INET6) { 4999 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5000 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5001 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5002 break; 5003 } 5004 if (ifa) { 5005 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5006 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 5007 if (srcmask) { 5008 bcopy(&sm->sin6_addr, srcmask, 5009 sizeof(*srcmask)); 5010 } 5011 } 5012 5013 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5014 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5015 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 5016 } 5017 5018 if (dst) 5019 bcopy(&ddst, dst, sizeof(*dst)); 5020 if (src) 5021 bcopy(&ssrc, src, sizeof(*src)); 5022 } 5023 5024 #ifdef IPV6CP_MYIFID_DYN 5025 /* 5026 * Generate random ifid. 5027 */ 5028 static void 5029 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5030 { 5031 /* TBD */ 5032 } 5033 5034 /* 5035 * Set my IPv6 address. Must be called at splnet. 5036 */ 5037 static void 5038 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5039 { 5040 STDDCL; 5041 struct ifaddr *ifa; 5042 struct sockaddr_in6 *sin6; 5043 5044 /* 5045 * Pick the first link-local AF_INET6 address from the list, 5046 * aliases don't make any sense on a p2p link anyway. 5047 */ 5048 5049 sin6 = NULL; 5050 IFADDR_FOREACH(ifa, ifp) 5051 { 5052 if (ifa->ifa_addr->sa_family == AF_INET6) 5053 { 5054 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5055 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5056 break; 5057 } 5058 } 5059 5060 if (ifa && sin6) 5061 { 5062 int error; 5063 struct sockaddr_in6 new_sin6 = *sin6; 5064 5065 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 5066 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5067 if (debug && error) 5068 { 5069 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5070 " failed, error=%d\n", ifp->if_xname, error); 5071 } 5072 #ifdef PFIL_HOOKS 5073 if (!error) 5074 (void)pfil_run_hooks(&if_pfil, 5075 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5076 #endif 5077 } 5078 } 5079 #endif 5080 5081 /* 5082 * Suggest a candidate address to be used by peer. 5083 */ 5084 static void 5085 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5086 { 5087 struct in6_addr myaddr; 5088 struct timeval tv; 5089 5090 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5091 5092 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5093 microtime(&tv); 5094 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5095 myaddr.s6_addr[14] ^= 0xff; 5096 myaddr.s6_addr[15] ^= 0xff; 5097 } else { 5098 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5099 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5100 } 5101 if (suggest) 5102 bcopy(&myaddr, suggest, sizeof(myaddr)); 5103 } 5104 #endif /*INET6*/ 5105 5106 /* 5107 * Process ioctl requests specific to the PPP interface. 5108 * Permissions have already been checked. 5109 */ 5110 static int 5111 sppp_params(struct sppp *sp, u_long cmd, void *data) 5112 { 5113 switch (cmd) { 5114 case SPPPGETAUTHCFG: 5115 { 5116 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5117 int error; 5118 size_t len; 5119 5120 cfg->myauthflags = sp->myauth.flags; 5121 cfg->hisauthflags = sp->hisauth.flags; 5122 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5123 cfg->hisauth = 0; 5124 if (sp->hisauth.proto) 5125 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5126 cfg->myauth = 0; 5127 if (sp->myauth.proto) 5128 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5129 if (cfg->myname_length == 0) { 5130 if (sp->myauth.name != NULL) 5131 cfg->myname_length = sp->myauth.name_len + 1; 5132 } else { 5133 if (sp->myauth.name == NULL) { 5134 cfg->myname_length = 0; 5135 } else { 5136 len = sp->myauth.name_len + 1; 5137 if (cfg->myname_length < len) 5138 return (ENAMETOOLONG); 5139 error = copyout(sp->myauth.name, cfg->myname, len); 5140 if (error) return error; 5141 } 5142 } 5143 if (cfg->hisname_length == 0) { 5144 if (sp->hisauth.name != NULL) 5145 cfg->hisname_length = sp->hisauth.name_len + 1; 5146 } else { 5147 if (sp->hisauth.name == NULL) { 5148 cfg->hisname_length = 0; 5149 } else { 5150 len = sp->hisauth.name_len + 1; 5151 if (cfg->hisname_length < len) 5152 return (ENAMETOOLONG); 5153 error = copyout(sp->hisauth.name, cfg->hisname, len); 5154 if (error) return error; 5155 } 5156 } 5157 } 5158 break; 5159 case SPPPSETAUTHCFG: 5160 { 5161 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5162 int error; 5163 5164 if (sp->myauth.name) { 5165 free(sp->myauth.name, M_DEVBUF); 5166 sp->myauth.name = NULL; 5167 } 5168 if (sp->myauth.secret) { 5169 free(sp->myauth.secret, M_DEVBUF); 5170 sp->myauth.secret = NULL; 5171 } 5172 if (sp->hisauth.name) { 5173 free(sp->hisauth.name, M_DEVBUF); 5174 sp->hisauth.name = NULL; 5175 } 5176 if (sp->hisauth.secret) { 5177 free(sp->hisauth.secret, M_DEVBUF); 5178 sp->hisauth.secret = NULL; 5179 } 5180 5181 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5182 if (cfg->hisname_length >= MCLBYTES) 5183 return (ENAMETOOLONG); 5184 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5185 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5186 if (error) { 5187 free(sp->hisauth.name, M_DEVBUF); 5188 sp->hisauth.name = NULL; 5189 return error; 5190 } 5191 sp->hisauth.name_len = cfg->hisname_length - 1; 5192 sp->hisauth.name[sp->hisauth.name_len] = 0; 5193 } 5194 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5195 if (cfg->hissecret_length >= MCLBYTES) 5196 return (ENAMETOOLONG); 5197 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5198 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5199 if (error) { 5200 free(sp->hisauth.secret, M_DEVBUF); 5201 sp->hisauth.secret = NULL; 5202 return error; 5203 } 5204 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5205 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5206 } 5207 if (cfg->myname != NULL && cfg->myname_length > 0) { 5208 if (cfg->myname_length >= MCLBYTES) 5209 return (ENAMETOOLONG); 5210 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5211 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5212 if (error) { 5213 free(sp->myauth.name, M_DEVBUF); 5214 sp->myauth.name = NULL; 5215 return error; 5216 } 5217 sp->myauth.name_len = cfg->myname_length - 1; 5218 sp->myauth.name[sp->myauth.name_len] = 0; 5219 } 5220 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5221 if (cfg->mysecret_length >= MCLBYTES) 5222 return (ENAMETOOLONG); 5223 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5224 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5225 if (error) { 5226 free(sp->myauth.secret, M_DEVBUF); 5227 sp->myauth.secret = NULL; 5228 return error; 5229 } 5230 sp->myauth.secret_len = cfg->mysecret_length - 1; 5231 sp->myauth.secret[sp->myauth.secret_len] = 0; 5232 } 5233 sp->myauth.flags = cfg->myauthflags; 5234 if (cfg->myauth) 5235 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5236 sp->hisauth.flags = cfg->hisauthflags; 5237 if (cfg->hisauth) 5238 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5239 sp->pp_auth_failures = 0; 5240 if (sp->hisauth.proto != 0) 5241 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5242 else 5243 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5244 } 5245 break; 5246 case SPPPGETLCPCFG: 5247 { 5248 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5249 lcpp->lcp_timeout = sp->lcp.timeout; 5250 } 5251 break; 5252 case SPPPSETLCPCFG: 5253 { 5254 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5255 sp->lcp.timeout = lcpp->lcp_timeout; 5256 } 5257 break; 5258 case SPPPGETSTATUS: 5259 { 5260 struct spppstatus *status = (struct spppstatus *)data; 5261 status->phase = sp->pp_phase; 5262 } 5263 break; 5264 case SPPPGETSTATUSNCP: 5265 { 5266 struct spppstatusncp *status = (struct spppstatusncp *)data; 5267 status->phase = sp->pp_phase; 5268 status->ncpup = sppp_ncp_check(sp); 5269 } 5270 break; 5271 case SPPPGETIDLETO: 5272 { 5273 struct spppidletimeout *to = (struct spppidletimeout *)data; 5274 to->idle_seconds = sp->pp_idle_timeout; 5275 } 5276 break; 5277 case SPPPSETIDLETO: 5278 { 5279 struct spppidletimeout *to = (struct spppidletimeout *)data; 5280 sp->pp_idle_timeout = to->idle_seconds; 5281 } 5282 break; 5283 case SPPPSETAUTHFAILURE: 5284 { 5285 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5286 sp->pp_max_auth_fail = afsettings->max_failures; 5287 sp->pp_auth_failures = 0; 5288 } 5289 break; 5290 case SPPPGETAUTHFAILURES: 5291 { 5292 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5293 stats->auth_failures = sp->pp_auth_failures; 5294 stats->max_failures = sp->pp_max_auth_fail; 5295 } 5296 break; 5297 case SPPPSETDNSOPTS: 5298 { 5299 struct spppdnssettings *req = (struct spppdnssettings *)data; 5300 sp->query_dns = req->query_dns & 3; 5301 } 5302 break; 5303 case SPPPGETDNSOPTS: 5304 { 5305 struct spppdnssettings *req = (struct spppdnssettings *)data; 5306 req->query_dns = sp->query_dns; 5307 } 5308 break; 5309 case SPPPGETDNSADDRS: 5310 { 5311 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5312 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5313 } 5314 break; 5315 case SPPPGETKEEPALIVE: 5316 { 5317 struct spppkeepalivesettings *settings = 5318 (struct spppkeepalivesettings*)data; 5319 settings->maxalive = sp->pp_maxalive; 5320 settings->max_noreceive = sp->pp_max_noreceive; 5321 } 5322 break; 5323 case SPPPSETKEEPALIVE: 5324 { 5325 struct spppkeepalivesettings *settings = 5326 (struct spppkeepalivesettings*)data; 5327 sp->pp_maxalive = settings->maxalive; 5328 sp->pp_max_noreceive = settings->max_noreceive; 5329 } 5330 break; 5331 default: 5332 return (EINVAL); 5333 } 5334 5335 return (0); 5336 } 5337 5338 static void 5339 sppp_phase_network(struct sppp *sp) 5340 { 5341 STDDCL; 5342 int i; 5343 uint32_t mask; 5344 5345 sp->pp_phase = SPPP_PHASE_NETWORK; 5346 5347 if (debug) 5348 { 5349 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5350 sppp_phase_name(sp->pp_phase)); 5351 } 5352 5353 /* Notify NCPs now. */ 5354 for (i = 0; i < IDX_COUNT; i++) 5355 if ((cps[i])->flags & CP_NCP) 5356 (cps[i])->Open(sp); 5357 5358 /* Send Up events to all NCPs. */ 5359 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5360 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5361 (cps[i])->Up(sp); 5362 5363 /* if no NCP is starting, all this was in vain, close down */ 5364 sppp_lcp_check_and_close(sp); 5365 } 5366 5367 5368 static const char * 5369 sppp_cp_type_name(u_char type) 5370 { 5371 static char buf[12]; 5372 switch (type) { 5373 case CONF_REQ: return "conf-req"; 5374 case CONF_ACK: return "conf-ack"; 5375 case CONF_NAK: return "conf-nak"; 5376 case CONF_REJ: return "conf-rej"; 5377 case TERM_REQ: return "term-req"; 5378 case TERM_ACK: return "term-ack"; 5379 case CODE_REJ: return "code-rej"; 5380 case PROTO_REJ: return "proto-rej"; 5381 case ECHO_REQ: return "echo-req"; 5382 case ECHO_REPLY: return "echo-reply"; 5383 case DISC_REQ: return "discard-req"; 5384 } 5385 snprintf(buf, sizeof(buf), "0x%x", type); 5386 return buf; 5387 } 5388 5389 static const char * 5390 sppp_auth_type_name(u_short proto, u_char type) 5391 { 5392 static char buf[12]; 5393 switch (proto) { 5394 case PPP_CHAP: 5395 switch (type) { 5396 case CHAP_CHALLENGE: return "challenge"; 5397 case CHAP_RESPONSE: return "response"; 5398 case CHAP_SUCCESS: return "success"; 5399 case CHAP_FAILURE: return "failure"; 5400 } 5401 case PPP_PAP: 5402 switch (type) { 5403 case PAP_REQ: return "req"; 5404 case PAP_ACK: return "ack"; 5405 case PAP_NAK: return "nak"; 5406 } 5407 } 5408 snprintf(buf, sizeof(buf), "0x%x", type); 5409 return buf; 5410 } 5411 5412 static const char * 5413 sppp_lcp_opt_name(u_char opt) 5414 { 5415 static char buf[12]; 5416 switch (opt) { 5417 case LCP_OPT_MRU: return "mru"; 5418 case LCP_OPT_ASYNC_MAP: return "async-map"; 5419 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5420 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5421 case LCP_OPT_MAGIC: return "magic"; 5422 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5423 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5424 } 5425 snprintf(buf, sizeof(buf), "0x%x", opt); 5426 return buf; 5427 } 5428 5429 static const char * 5430 sppp_ipcp_opt_name(u_char opt) 5431 { 5432 static char buf[12]; 5433 switch (opt) { 5434 case IPCP_OPT_ADDRESSES: return "addresses"; 5435 case IPCP_OPT_COMPRESSION: return "compression"; 5436 case IPCP_OPT_ADDRESS: return "address"; 5437 } 5438 snprintf(buf, sizeof(buf), "0x%x", opt); 5439 return buf; 5440 } 5441 5442 #ifdef INET6 5443 static const char * 5444 sppp_ipv6cp_opt_name(u_char opt) 5445 { 5446 static char buf[12]; 5447 switch (opt) { 5448 case IPV6CP_OPT_IFID: return "ifid"; 5449 case IPV6CP_OPT_COMPRESSION: return "compression"; 5450 } 5451 snprintf(buf, sizeof(buf), "0x%x", opt); 5452 return buf; 5453 } 5454 #endif 5455 5456 static const char * 5457 sppp_state_name(int state) 5458 { 5459 switch (state) { 5460 case STATE_INITIAL: return "initial"; 5461 case STATE_STARTING: return "starting"; 5462 case STATE_CLOSED: return "closed"; 5463 case STATE_STOPPED: return "stopped"; 5464 case STATE_CLOSING: return "closing"; 5465 case STATE_STOPPING: return "stopping"; 5466 case STATE_REQ_SENT: return "req-sent"; 5467 case STATE_ACK_RCVD: return "ack-rcvd"; 5468 case STATE_ACK_SENT: return "ack-sent"; 5469 case STATE_OPENED: return "opened"; 5470 } 5471 return "illegal"; 5472 } 5473 5474 static const char * 5475 sppp_phase_name(int phase) 5476 { 5477 switch (phase) { 5478 case SPPP_PHASE_DEAD: return "dead"; 5479 case SPPP_PHASE_ESTABLISH: return "establish"; 5480 case SPPP_PHASE_TERMINATE: return "terminate"; 5481 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5482 case SPPP_PHASE_NETWORK: return "network"; 5483 } 5484 return "illegal"; 5485 } 5486 5487 static const char * 5488 sppp_proto_name(u_short proto) 5489 { 5490 static char buf[12]; 5491 switch (proto) { 5492 case PPP_LCP: return "lcp"; 5493 case PPP_IPCP: return "ipcp"; 5494 case PPP_PAP: return "pap"; 5495 case PPP_CHAP: return "chap"; 5496 case PPP_IPV6CP: return "ipv6cp"; 5497 } 5498 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5499 return buf; 5500 } 5501 5502 static void 5503 sppp_print_bytes(const u_char *p, u_short len) 5504 { 5505 addlog(" %02x", *p++); 5506 while (--len > 0) 5507 addlog("-%02x", *p++); 5508 } 5509 5510 static void 5511 sppp_print_string(const char *p, u_short len) 5512 { 5513 u_char c; 5514 5515 while (len-- > 0) { 5516 c = *p++; 5517 /* 5518 * Print only ASCII chars directly. RFC 1994 recommends 5519 * using only them, but we don't rely on it. */ 5520 if (c < ' ' || c > '~') 5521 addlog("\\x%x", c); 5522 else 5523 addlog("%c", c); 5524 } 5525 } 5526 5527 static const char * 5528 sppp_dotted_quad(uint32_t addr) 5529 { 5530 static char s[16]; 5531 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5532 (int)((addr >> 24) & 0xff), 5533 (int)((addr >> 16) & 0xff), 5534 (int)((addr >> 8) & 0xff), 5535 (int)(addr & 0xff)); 5536 return s; 5537 } 5538 5539 /* a dummy, used to drop uninteresting events */ 5540 static void 5541 sppp_null(struct sppp *unused) 5542 { 5543 /* do just nothing */ 5544 } 5545 /* 5546 * This file is large. Tell emacs to highlight it nevertheless. 5547 * 5548 * Local Variables: 5549 * hilit-auto-highlight-maxout: 120000 5550 * End: 5551 */ 5552
Indexes created Sat Sep 27 21:09:56 GMT 2025