if_spppsubr.c revision 1.96
1 /* $NetBSD: if_spppsubr.c,v 1.96 2006/08/23 20:02:23 adrianp 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 1.96 2006/08/23 20:02:23 adrianp Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_ns.h" 50 #include "opt_pfil_hooks.h" 51 52 #include <sys/param.h> 53 #include <sys/proc.h> 54 #include <sys/systm.h> 55 #include <sys/kernel.h> 56 #include <sys/sockio.h> 57 #include <sys/socket.h> 58 #include <sys/syslog.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/callout.h> 62 #include <sys/md5.h> 63 #include <sys/inttypes.h> 64 #include <sys/kauth.h> 65 66 #include <net/if.h> 67 #include <net/netisr.h> 68 #include <net/if_types.h> 69 #include <net/route.h> 70 #include <net/ppp_defs.h> 71 72 #include <machine/stdarg.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/in_var.h> 77 #ifdef INET 78 #include <netinet/ip.h> 79 #include <netinet/tcp.h> 80 #endif 81 #include <net/ethertypes.h> 82 83 #ifdef INET6 84 #include <netinet6/scope6_var.h> 85 #endif 86 87 #ifdef IPX 88 #include <netipx/ipx.h> 89 #include <netipx/ipx_if.h> 90 #endif 91 92 #ifdef NS 93 #include <netns/ns.h> 94 #include <netns/ns_if.h> 95 #endif 96 97 #ifdef ISO 98 #include <netiso/argo_debug.h> 99 #include <netiso/iso.h> 100 #include <netiso/iso_var.h> 101 #include <netiso/iso_snpac.h> 102 #endif 103 104 #include <net/if_sppp.h> 105 #include <net/if_spppvar.h> 106 107 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 108 #define LOOPALIVECNT 3 /* loopback detection tries */ 109 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 110 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 111 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 112 113 /* 114 * Interface flags that can be set in an ifconfig command. 115 * 116 * Setting link0 will make the link passive, i.e. it will be marked 117 * as being administrative openable, but won't be opened to begin 118 * with. Incoming calls will be answered, or subsequent calls with 119 * -link1 will cause the administrative open of the LCP layer. 120 * 121 * Setting link1 will cause the link to auto-dial only as packets 122 * arrive to be sent. 123 * 124 * Setting IFF_DEBUG will syslog the option negotiation and state 125 * transitions at level kern.debug. Note: all logs consistently look 126 * like 127 * 128 * <if-name><unit>: <proto-name> <additional info...> 129 * 130 * with <if-name><unit> being something like "bppp0", and <proto-name> 131 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 132 */ 133 134 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 135 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 136 137 #define CONF_REQ 1 /* PPP configure request */ 138 #define CONF_ACK 2 /* PPP configure acknowledge */ 139 #define CONF_NAK 3 /* PPP configure negative ack */ 140 #define CONF_REJ 4 /* PPP configure reject */ 141 #define TERM_REQ 5 /* PPP terminate request */ 142 #define TERM_ACK 6 /* PPP terminate acknowledge */ 143 #define CODE_REJ 7 /* PPP code reject */ 144 #define PROTO_REJ 8 /* PPP protocol reject */ 145 #define ECHO_REQ 9 /* PPP echo request */ 146 #define ECHO_REPLY 10 /* PPP echo reply */ 147 #define DISC_REQ 11 /* PPP discard request */ 148 149 #define LCP_OPT_MRU 1 /* maximum receive unit */ 150 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 151 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 152 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 153 #define LCP_OPT_MAGIC 5 /* magic number */ 154 #define LCP_OPT_RESERVED 6 /* reserved */ 155 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 156 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 157 158 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 159 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 160 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 161 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 162 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 163 164 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 165 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 166 167 #define PAP_REQ 1 /* PAP name/password request */ 168 #define PAP_ACK 2 /* PAP acknowledge */ 169 #define PAP_NAK 3 /* PAP fail */ 170 171 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 172 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 173 #define CHAP_SUCCESS 3 /* CHAP response ok */ 174 #define CHAP_FAILURE 4 /* CHAP response failed */ 175 176 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 177 178 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 179 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 180 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 181 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 182 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 183 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 184 185 /* states are named and numbered according to RFC 1661 */ 186 #define STATE_INITIAL 0 187 #define STATE_STARTING 1 188 #define STATE_CLOSED 2 189 #define STATE_STOPPED 3 190 #define STATE_CLOSING 4 191 #define STATE_STOPPING 5 192 #define STATE_REQ_SENT 6 193 #define STATE_ACK_RCVD 7 194 #define STATE_ACK_SENT 8 195 #define STATE_OPENED 9 196 197 struct ppp_header { 198 u_int8_t address; 199 u_int8_t control; 200 u_int16_t protocol; 201 } __attribute__((__packed__)); 202 #define PPP_HEADER_LEN sizeof (struct ppp_header) 203 204 struct lcp_header { 205 u_int8_t type; 206 u_int8_t ident; 207 u_int16_t len; 208 } __attribute__((__packed__)); 209 #define LCP_HEADER_LEN sizeof (struct lcp_header) 210 211 struct cisco_packet { 212 u_int32_t type; 213 u_int32_t par1; 214 u_int32_t par2; 215 u_int16_t rel; 216 u_int16_t time0; 217 u_int16_t time1; 218 } __attribute__((__packed__)); 219 #define CISCO_PACKET_LEN 18 220 221 /* 222 * We follow the spelling and capitalization of RFC 1661 here, to make 223 * it easier comparing with the standard. Please refer to this RFC in 224 * case you can't make sense out of these abbreviation; it will also 225 * explain the semantics related to the various events and actions. 226 */ 227 struct cp { 228 u_short proto; /* PPP control protocol number */ 229 u_char protoidx; /* index into state table in struct sppp */ 230 u_char flags; 231 #define CP_LCP 0x01 /* this is the LCP */ 232 #define CP_AUTH 0x02 /* this is an authentication protocol */ 233 #define CP_NCP 0x04 /* this is a NCP */ 234 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 235 const char *name; /* name of this control protocol */ 236 /* event handlers */ 237 void (*Up)(struct sppp *sp); 238 void (*Down)(struct sppp *sp); 239 void (*Open)(struct sppp *sp); 240 void (*Close)(struct sppp *sp); 241 void (*TO)(void *sp); 242 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 243 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 244 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 245 /* actions */ 246 void (*tlu)(struct sppp *sp); 247 void (*tld)(struct sppp *sp); 248 void (*tls)(struct sppp *sp); 249 void (*tlf)(struct sppp *sp); 250 void (*scr)(struct sppp *sp); 251 }; 252 253 static struct sppp *spppq; 254 static struct callout keepalive_ch; 255 256 #ifdef INET 257 /* 258 * The following disgusting hack gets around the problem that IP TOS 259 * can't be set yet. We want to put "interactive" traffic on a high 260 * priority queue. To decide if traffic is interactive, we check that 261 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 262 * 263 * XXX is this really still necessary? - joerg - 264 */ 265 static u_short interactive_ports[8] = { 266 0, 513, 0, 0, 267 0, 21, 0, 23, 268 }; 269 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 270 #endif 271 272 /* almost every function needs these */ 273 #define STDDCL \ 274 struct ifnet *ifp = &sp->pp_if; \ 275 int debug = ifp->if_flags & IFF_DEBUG 276 277 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 278 struct sockaddr *dst, struct rtentry *rt); 279 280 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 281 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 282 283 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 284 struct mbuf *m); 285 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 286 u_char ident, u_short len, void *data); 287 /* static void sppp_cp_timeout(void *arg); */ 288 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 289 int newstate); 290 static void sppp_auth_send(const struct cp *cp, 291 struct sppp *sp, unsigned int type, unsigned int id, 292 ...); 293 294 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 295 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 296 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 297 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 298 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 299 300 static void sppp_null(struct sppp *sp); 301 302 static void sppp_lcp_init(struct sppp *sp); 303 static void sppp_lcp_up(struct sppp *sp); 304 static void sppp_lcp_down(struct sppp *sp); 305 static void sppp_lcp_open(struct sppp *sp); 306 static void sppp_lcp_close(struct sppp *sp); 307 static void sppp_lcp_TO(void *sp); 308 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_lcp_tlu(struct sppp *sp); 312 static void sppp_lcp_tld(struct sppp *sp); 313 static void sppp_lcp_tls(struct sppp *sp); 314 static void sppp_lcp_tlf(struct sppp *sp); 315 static void sppp_lcp_scr(struct sppp *sp); 316 static void sppp_lcp_check_and_close(struct sppp *sp); 317 static int sppp_ncp_check(struct sppp *sp); 318 319 static void sppp_ipcp_init(struct sppp *sp); 320 static void sppp_ipcp_up(struct sppp *sp); 321 static void sppp_ipcp_down(struct sppp *sp); 322 static void sppp_ipcp_open(struct sppp *sp); 323 static void sppp_ipcp_close(struct sppp *sp); 324 static void sppp_ipcp_TO(void *sp); 325 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 327 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 328 static void sppp_ipcp_tlu(struct sppp *sp); 329 static void sppp_ipcp_tld(struct sppp *sp); 330 static void sppp_ipcp_tls(struct sppp *sp); 331 static void sppp_ipcp_tlf(struct sppp *sp); 332 static void sppp_ipcp_scr(struct sppp *sp); 333 334 static void sppp_ipv6cp_init(struct sppp *sp); 335 static void sppp_ipv6cp_up(struct sppp *sp); 336 static void sppp_ipv6cp_down(struct sppp *sp); 337 static void sppp_ipv6cp_open(struct sppp *sp); 338 static void sppp_ipv6cp_close(struct sppp *sp); 339 static void sppp_ipv6cp_TO(void *sp); 340 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 341 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 342 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 343 static void sppp_ipv6cp_tlu(struct sppp *sp); 344 static void sppp_ipv6cp_tld(struct sppp *sp); 345 static void sppp_ipv6cp_tls(struct sppp *sp); 346 static void sppp_ipv6cp_tlf(struct sppp *sp); 347 static void sppp_ipv6cp_scr(struct sppp *sp); 348 349 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 350 static void sppp_pap_init(struct sppp *sp); 351 static void sppp_pap_open(struct sppp *sp); 352 static void sppp_pap_close(struct sppp *sp); 353 static void sppp_pap_TO(void *sp); 354 static void sppp_pap_my_TO(void *sp); 355 static void sppp_pap_tlu(struct sppp *sp); 356 static void sppp_pap_tld(struct sppp *sp); 357 static void sppp_pap_scr(struct sppp *sp); 358 359 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 360 static void sppp_chap_init(struct sppp *sp); 361 static void sppp_chap_open(struct sppp *sp); 362 static void sppp_chap_close(struct sppp *sp); 363 static void sppp_chap_TO(void *sp); 364 static void sppp_chap_tlu(struct sppp *sp); 365 static void sppp_chap_tld(struct sppp *sp); 366 static void sppp_chap_scr(struct sppp *sp); 367 368 static const char *sppp_auth_type_name(u_short proto, u_char type); 369 static const char *sppp_cp_type_name(u_char type); 370 static const char *sppp_dotted_quad(u_int32_t addr); 371 static const char *sppp_ipcp_opt_name(u_char opt); 372 #ifdef INET6 373 static const char *sppp_ipv6cp_opt_name(u_char opt); 374 #endif 375 static const char *sppp_lcp_opt_name(u_char opt); 376 static const char *sppp_phase_name(int phase); 377 static const char *sppp_proto_name(u_short proto); 378 static const char *sppp_state_name(int state); 379 static int sppp_params(struct sppp *sp, int cmd, void *data); 380 #ifdef INET 381 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 382 u_int32_t *srcmask); 383 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 384 static void sppp_clear_ip_addrs(struct sppp *sp); 385 #endif 386 static void sppp_keepalive(void *dummy); 387 static void sppp_phase_network(struct sppp *sp); 388 static void sppp_print_bytes(const u_char *p, u_short len); 389 static void sppp_print_string(const char *p, u_short len); 390 #ifdef INET6 391 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 392 struct in6_addr *dst, struct in6_addr *srcmask); 393 #ifdef IPV6CP_MYIFID_DYN 394 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 395 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 396 #endif 397 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 398 #endif 399 400 /* our control protocol descriptors */ 401 static const struct cp lcp = { 402 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 403 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 404 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 405 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 406 sppp_lcp_scr 407 }; 408 409 static const struct cp ipcp = { 410 PPP_IPCP, IDX_IPCP, 411 #ifdef INET 412 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 413 #else 414 0, 415 #endif 416 "ipcp", 417 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 418 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 419 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 420 sppp_ipcp_scr 421 }; 422 423 static const struct cp ipv6cp = { 424 PPP_IPV6CP, IDX_IPV6CP, 425 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 426 CP_NCP, 427 #else 428 0, 429 #endif 430 "ipv6cp", 431 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 432 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 433 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 434 sppp_ipv6cp_scr 435 }; 436 437 static const struct cp pap = { 438 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 439 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 440 sppp_pap_TO, 0, 0, 0, 441 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 442 sppp_pap_scr 443 }; 444 445 static const struct cp chap = { 446 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 447 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 448 sppp_chap_TO, 0, 0, 0, 449 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 450 sppp_chap_scr 451 }; 452 453 static const struct cp *cps[IDX_COUNT] = { 454 &lcp, /* IDX_LCP */ 455 &ipcp, /* IDX_IPCP */ 456 &ipv6cp, /* IDX_IPV6CP */ 457 &pap, /* IDX_PAP */ 458 &chap, /* IDX_CHAP */ 459 }; 460 461 462 void spppattach(int); 463 void 464 /*ARGSUSED*/ 465 spppattach(int count) 466 { 467 } 468 469 /* 470 * Exported functions, comprising our interface to the lower layer. 471 */ 472 473 /* 474 * Process the received packet. 475 */ 476 void 477 sppp_input(struct ifnet *ifp, struct mbuf *m) 478 { 479 struct ppp_header *h = NULL; 480 struct ifqueue *inq = 0; 481 u_int16_t protocol; 482 int s; 483 struct sppp *sp = (struct sppp *)ifp; 484 int debug = ifp->if_flags & IFF_DEBUG; 485 486 if (ifp->if_flags & IFF_UP) { 487 /* Count received bytes, add hardware framing */ 488 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 489 /* Note time of last receive */ 490 sp->pp_last_receive = time_uptime; 491 } 492 493 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 494 /* Too small packet, drop it. */ 495 if (debug) 496 log(LOG_DEBUG, 497 "%s: input packet is too small, %d bytes\n", 498 ifp->if_xname, m->m_pkthdr.len); 499 drop: 500 ++ifp->if_ierrors; 501 ++ifp->if_iqdrops; 502 m_freem(m); 503 return; 504 } 505 506 if (sp->pp_flags & PP_NOFRAMING) { 507 memcpy(&protocol, mtod(m, void *), 2); 508 protocol = ntohs(protocol); 509 m_adj(m, 2); 510 } else { 511 512 /* Get PPP header. */ 513 h = mtod(m, struct ppp_header *); 514 m_adj(m, PPP_HEADER_LEN); 515 516 switch (h->address) { 517 case PPP_ALLSTATIONS: 518 if (h->control != PPP_UI) 519 goto invalid; 520 if (sp->pp_flags & PP_CISCO) { 521 if (debug) 522 log(LOG_DEBUG, 523 "%s: PPP packet in Cisco mode " 524 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 525 ifp->if_xname, 526 h->address, h->control, ntohs(h->protocol)); 527 goto drop; 528 } 529 break; 530 case CISCO_MULTICAST: 531 case CISCO_UNICAST: 532 /* Don't check the control field here (RFC 1547). */ 533 if (! (sp->pp_flags & PP_CISCO)) { 534 if (debug) 535 log(LOG_DEBUG, 536 "%s: Cisco packet in PPP mode " 537 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 538 ifp->if_xname, 539 h->address, h->control, ntohs(h->protocol)); 540 goto drop; 541 } 542 switch (ntohs(h->protocol)) { 543 default: 544 ++ifp->if_noproto; 545 goto invalid; 546 case CISCO_KEEPALIVE: 547 sppp_cisco_input((struct sppp *) ifp, m); 548 m_freem(m); 549 return; 550 #ifdef INET 551 case ETHERTYPE_IP: 552 schednetisr(NETISR_IP); 553 inq = &ipintrq; 554 break; 555 #endif 556 #ifdef INET6 557 case ETHERTYPE_IPV6: 558 schednetisr(NETISR_IPV6); 559 inq = &ip6intrq; 560 break; 561 #endif 562 #ifdef IPX 563 case ETHERTYPE_IPX: 564 schednetisr(NETISR_IPX); 565 inq = &ipxintrq; 566 break; 567 #endif 568 #ifdef NS 569 case ETHERTYPE_NS: 570 schednetisr(NETISR_NS); 571 inq = &nsintrq; 572 break; 573 #endif 574 } 575 goto queue_pkt; 576 default: /* Invalid PPP packet. */ 577 invalid: 578 if (debug) 579 log(LOG_DEBUG, 580 "%s: invalid input packet " 581 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 582 ifp->if_xname, 583 h->address, h->control, ntohs(h->protocol)); 584 goto drop; 585 } 586 protocol = ntohs(h->protocol); 587 } 588 589 switch (protocol) { 590 default: 591 if (sp->state[IDX_LCP] == STATE_OPENED) { 592 u_int16_t prot = htons(protocol); 593 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 594 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 595 &prot); 596 } 597 if (debug) 598 log(LOG_DEBUG, 599 "%s: invalid input protocol " 600 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 601 ++ifp->if_noproto; 602 goto drop; 603 case PPP_LCP: 604 sppp_cp_input(&lcp, sp, m); 605 m_freem(m); 606 return; 607 case PPP_PAP: 608 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 609 sppp_pap_input(sp, m); 610 m_freem(m); 611 return; 612 case PPP_CHAP: 613 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 614 sppp_chap_input(sp, m); 615 m_freem(m); 616 return; 617 #ifdef INET 618 case PPP_IPCP: 619 if (sp->pp_phase == SPPP_PHASE_NETWORK) 620 sppp_cp_input(&ipcp, sp, m); 621 m_freem(m); 622 return; 623 case PPP_IP: 624 if (sp->state[IDX_IPCP] == STATE_OPENED) { 625 schednetisr(NETISR_IP); 626 inq = &ipintrq; 627 sp->pp_last_activity = time_uptime; 628 } 629 break; 630 #endif 631 #ifdef INET6 632 case PPP_IPV6CP: 633 if (sp->pp_phase == SPPP_PHASE_NETWORK) 634 sppp_cp_input(&ipv6cp, sp, m); 635 m_freem(m); 636 return; 637 638 case PPP_IPV6: 639 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 640 schednetisr(NETISR_IPV6); 641 inq = &ip6intrq; 642 sp->pp_last_activity = time_uptime; 643 } 644 break; 645 #endif 646 #ifdef IPX 647 case PPP_IPX: 648 /* IPX IPXCP not implemented yet */ 649 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 650 schednetisr(NETISR_IPX); 651 inq = &ipxintrq; 652 } 653 break; 654 #endif 655 #ifdef NS 656 case PPP_XNS: 657 /* XNS IDPCP not implemented yet */ 658 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 659 schednetisr(NETISR_NS); 660 inq = &nsintrq; 661 } 662 break; 663 #endif 664 #ifdef ISO 665 case PPP_ISO: 666 /* OSI NLCP not implemented yet */ 667 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 668 schednetisr(NETISR_ISO); 669 inq = &clnlintrq; 670 } 671 break; 672 #endif 673 } 674 675 queue_pkt: 676 if (! (ifp->if_flags & IFF_UP) || ! inq) 677 goto drop; 678 679 /* Check queue. */ 680 s = splnet(); 681 if (IF_QFULL(inq)) { 682 /* Queue overflow. */ 683 IF_DROP(inq); 684 splx(s); 685 if (debug) 686 log(LOG_DEBUG, "%s: protocol queue overflow\n", 687 ifp->if_xname); 688 goto drop; 689 } 690 IF_ENQUEUE(inq, m); 691 splx(s); 692 } 693 694 /* 695 * Enqueue transmit packet. 696 */ 697 static int 698 sppp_output(struct ifnet *ifp, struct mbuf *m, 699 struct sockaddr *dst, struct rtentry *rt) 700 { 701 struct sppp *sp = (struct sppp *) ifp; 702 struct ppp_header *h = NULL; 703 struct ifqueue *ifq = NULL; /* XXX */ 704 int s, error = 0; 705 u_int16_t protocol; 706 ALTQ_DECL(struct altq_pktattr pktattr;) 707 708 s = splnet(); 709 710 sp->pp_last_activity = time_uptime; 711 712 if ((ifp->if_flags & IFF_UP) == 0 || 713 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 714 m_freem(m); 715 splx(s); 716 return (ENETDOWN); 717 } 718 719 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 720 /* 721 * Interface is not yet running, but auto-dial. Need 722 * to start LCP for it. 723 */ 724 ifp->if_flags |= IFF_RUNNING; 725 splx(s); 726 lcp.Open(sp); 727 s = splnet(); 728 } 729 730 /* 731 * If the queueing discipline needs packet classification, 732 * do it before prepending link headers. 733 */ 734 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 735 736 #ifdef INET 737 if (dst->sa_family == AF_INET) { 738 struct ip *ip = NULL; 739 struct tcphdr *th = NULL; 740 741 if (m->m_len >= sizeof(struct ip)) { 742 ip = mtod(m, struct ip *); 743 if (ip->ip_p == IPPROTO_TCP && 744 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 745 sizeof(struct tcphdr)) { 746 th = (struct tcphdr *) 747 ((caddr_t)ip + (ip->ip_hl << 2)); 748 } 749 } else 750 ip = NULL; 751 752 /* 753 * When using dynamic local IP address assignment by using 754 * 0.0.0.0 as a local address, the first TCP session will 755 * not connect because the local TCP checksum is computed 756 * using 0.0.0.0 which will later become our real IP address 757 * so the TCP checksum computed at the remote end will 758 * become invalid. So we 759 * - don't let packets with src ip addr 0 thru 760 * - we flag TCP packets with src ip 0 as an error 761 */ 762 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 763 u_int8_t proto = ip->ip_p; 764 765 m_freem(m); 766 splx(s); 767 if (proto == IPPROTO_TCP) 768 return (EADDRNOTAVAIL); 769 else 770 return (0); 771 } 772 773 /* 774 * Put low delay, telnet, rlogin and ftp control packets 775 * in front of the queue. 776 */ 777 778 if (!IF_QFULL(&sp->pp_fastq) && 779 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 780 (th && (INTERACTIVE(ntohs(th->th_sport)) || 781 INTERACTIVE(ntohs(th->th_dport)))))) 782 ifq = &sp->pp_fastq; 783 } 784 #endif 785 786 #ifdef INET6 787 if (dst->sa_family == AF_INET6) { 788 /* XXX do something tricky here? */ 789 } 790 #endif 791 792 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 793 /* 794 * Prepend general data packet PPP header. For now, IP only. 795 */ 796 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 797 if (! m) { 798 if (ifp->if_flags & IFF_DEBUG) 799 log(LOG_DEBUG, "%s: no memory for transmit header\n", 800 ifp->if_xname); 801 ++ifp->if_oerrors; 802 splx(s); 803 return (ENOBUFS); 804 } 805 /* 806 * May want to check size of packet 807 * (albeit due to the implementation it's always enough) 808 */ 809 h = mtod(m, struct ppp_header *); 810 if (sp->pp_flags & PP_CISCO) { 811 h->address = CISCO_UNICAST; /* unicast address */ 812 h->control = 0; 813 } else { 814 h->address = PPP_ALLSTATIONS; /* broadcast address */ 815 h->control = PPP_UI; /* Unnumbered Info */ 816 } 817 } 818 819 switch (dst->sa_family) { 820 #ifdef INET 821 case AF_INET: /* Internet Protocol */ 822 if (sp->pp_flags & PP_CISCO) 823 protocol = htons(ETHERTYPE_IP); 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_IP); 835 if (sp->state[IDX_IPCP] != STATE_OPENED) 836 error = ENETDOWN; 837 } 838 break; 839 #endif 840 #ifdef INET6 841 case AF_INET6: /* Internet Protocol version 6 */ 842 if (sp->pp_flags & PP_CISCO) 843 protocol = htons(ETHERTYPE_IPV6); 844 else { 845 /* 846 * Don't choke with an ENETDOWN early. It's 847 * possible that we just started dialing out, 848 * so don't drop the packet immediately. If 849 * we notice that we run out of buffer space 850 * below, we will however remember that we are 851 * not ready to carry IP packets, and return 852 * ENETDOWN, as opposed to ENOBUFS. 853 */ 854 protocol = htons(PPP_IPV6); 855 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 856 error = ENETDOWN; 857 } 858 break; 859 #endif 860 #ifdef NS 861 case AF_NS: /* Xerox NS Protocol */ 862 protocol = htons((sp->pp_flags & PP_CISCO) ? 863 ETHERTYPE_NS : PPP_XNS); 864 break; 865 #endif 866 #ifdef IPX 867 case AF_IPX: /* Novell IPX Protocol */ 868 protocol = htons((sp->pp_flags & PP_CISCO) ? 869 ETHERTYPE_IPX : PPP_IPX); 870 break; 871 #endif 872 #ifdef ISO 873 case AF_ISO: /* ISO OSI Protocol */ 874 if (sp->pp_flags & PP_CISCO) 875 goto nosupport; 876 protocol = htons(PPP_ISO); 877 break; 878 nosupport: 879 #endif 880 default: 881 m_freem(m); 882 ++ifp->if_oerrors; 883 splx(s); 884 return (EAFNOSUPPORT); 885 } 886 887 if (sp->pp_flags & PP_NOFRAMING) { 888 M_PREPEND(m, 2, M_DONTWAIT); 889 if (m == NULL) { 890 if (ifp->if_flags & IFF_DEBUG) 891 log(LOG_DEBUG, "%s: no memory for transmit header\n", 892 ifp->if_xname); 893 ++ifp->if_oerrors; 894 splx(s); 895 return (ENOBUFS); 896 } 897 *mtod(m, u_int16_t *) = protocol; 898 } else { 899 h->protocol = protocol; 900 } 901 902 903 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 904 905 if (error == 0) { 906 /* 907 * Count output packets and bytes. 908 * The packet length includes header + additional hardware 909 * framing according to RFC 1333. 910 */ 911 if (!(ifp->if_flags & IFF_OACTIVE)) 912 (*ifp->if_start)(ifp); 913 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 914 } 915 splx(s); 916 return error; 917 } 918 919 void 920 sppp_attach(struct ifnet *ifp) 921 { 922 struct sppp *sp = (struct sppp *) ifp; 923 924 /* Initialize keepalive handler. */ 925 if (! spppq) { 926 callout_init(&keepalive_ch); 927 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 928 } 929 930 /* Insert new entry into the keepalive list. */ 931 sp->pp_next = spppq; 932 spppq = sp; 933 934 sp->pp_if.if_type = IFT_PPP; 935 sp->pp_if.if_output = sppp_output; 936 sp->pp_fastq.ifq_maxlen = 32; 937 sp->pp_cpq.ifq_maxlen = 20; 938 sp->pp_loopcnt = 0; 939 sp->pp_alivecnt = 0; 940 sp->pp_last_activity = 0; 941 sp->pp_last_receive = 0; 942 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 943 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 944 sp->pp_idle_timeout = 0; 945 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 946 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 947 sp->pp_auth_failures = 0; 948 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 949 sp->pp_phase = SPPP_PHASE_DEAD; 950 sp->pp_up = lcp.Up; 951 sp->pp_down = lcp.Down; 952 953 if_alloc_sadl(ifp); 954 955 memset(&sp->myauth, 0, sizeof sp->myauth); 956 memset(&sp->hisauth, 0, sizeof sp->hisauth); 957 sppp_lcp_init(sp); 958 sppp_ipcp_init(sp); 959 sppp_ipv6cp_init(sp); 960 sppp_pap_init(sp); 961 sppp_chap_init(sp); 962 } 963 964 void 965 sppp_detach(struct ifnet *ifp) 966 { 967 struct sppp **q, *p, *sp = (struct sppp *) ifp; 968 int i; 969 970 /* Remove the entry from the keepalive list. */ 971 for (q = &spppq; (p = *q); q = &p->pp_next) 972 if (p == sp) { 973 *q = p->pp_next; 974 break; 975 } 976 977 /* Stop keepalive handler. */ 978 if (! spppq) { 979 callout_stop(&keepalive_ch); 980 } 981 982 for (i = 0; i < IDX_COUNT; i++) { 983 callout_stop(&sp->ch[i]); 984 } 985 callout_stop(&sp->pap_my_to_ch); 986 987 /* free authentication info */ 988 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 989 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 990 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 991 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 992 993 #if 0 /* done in if_detach() */ 994 if_free_sadl(ifp); 995 #endif 996 } 997 998 /* 999 * Flush the interface output queue. 1000 */ 1001 void 1002 sppp_flush(struct ifnet *ifp) 1003 { 1004 struct sppp *sp = (struct sppp *) ifp; 1005 1006 IFQ_PURGE(&sp->pp_if.if_snd); 1007 IF_PURGE(&sp->pp_fastq); 1008 IF_PURGE(&sp->pp_cpq); 1009 } 1010 1011 /* 1012 * Check if the output queue is empty. 1013 */ 1014 int 1015 sppp_isempty(struct ifnet *ifp) 1016 { 1017 struct sppp *sp = (struct sppp *) ifp; 1018 int empty, s; 1019 1020 s = splnet(); 1021 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1022 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1023 splx(s); 1024 return (empty); 1025 } 1026 1027 /* 1028 * Get next packet to send. 1029 */ 1030 struct mbuf * 1031 sppp_dequeue(struct ifnet *ifp) 1032 { 1033 struct sppp *sp = (struct sppp *) ifp; 1034 struct mbuf *m; 1035 int s; 1036 1037 s = splnet(); 1038 /* 1039 * Process only the control protocol queue until we have at 1040 * least one NCP open. 1041 * 1042 * Do always serve all three queues in Cisco mode. 1043 */ 1044 IF_DEQUEUE(&sp->pp_cpq, m); 1045 if (m == NULL && 1046 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1047 IF_DEQUEUE(&sp->pp_fastq, m); 1048 if (m == NULL) 1049 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1050 } 1051 splx(s); 1052 return m; 1053 } 1054 1055 /* 1056 * Process an ioctl request. Called on low priority level. 1057 */ 1058 int 1059 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1060 { 1061 struct ifreq *ifr = (struct ifreq *) data; 1062 struct sppp *sp = (struct sppp *) ifp; 1063 int s, error=0, going_up, going_down, newmode; 1064 1065 s = splnet(); 1066 switch (cmd) { 1067 case SIOCAIFADDR: 1068 case SIOCSIFDSTADDR: 1069 case SIOCSIFADDR: 1070 break; 1071 1072 case SIOCSIFFLAGS: 1073 going_up = ifp->if_flags & IFF_UP && 1074 (ifp->if_flags & IFF_RUNNING) == 0; 1075 going_down = (ifp->if_flags & IFF_UP) == 0 && 1076 ifp->if_flags & IFF_RUNNING; 1077 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1078 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1079 /* sanity */ 1080 newmode = IFF_PASSIVE; 1081 ifp->if_flags &= ~IFF_AUTO; 1082 } 1083 1084 if (going_up || going_down) 1085 lcp.Close(sp); 1086 if (going_up && newmode == 0) { 1087 /* neither auto-dial nor passive */ 1088 ifp->if_flags |= IFF_RUNNING; 1089 if (!(sp->pp_flags & PP_CISCO)) 1090 lcp.Open(sp); 1091 } else if (going_down) { 1092 sppp_flush(ifp); 1093 ifp->if_flags &= ~IFF_RUNNING; 1094 } 1095 1096 break; 1097 1098 #ifdef SIOCSIFMTU 1099 #ifndef ifr_mtu 1100 #define ifr_mtu ifr_metric 1101 #endif 1102 case SIOCSIFMTU: 1103 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1104 error = EINVAL; 1105 break; 1106 } 1107 1108 ifp->if_mtu = ifr->ifr_mtu; 1109 break; 1110 #endif 1111 #ifdef SLIOCSETMTU 1112 case SLIOCSETMTU: 1113 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1114 { 1115 error = EINVAL; 1116 break; 1117 } 1118 1119 ifp->if_mtu = *(short *)data; 1120 break; 1121 #endif 1122 #ifdef SIOCGIFMTU 1123 case SIOCGIFMTU: 1124 ifr->ifr_mtu = ifp->if_mtu; 1125 break; 1126 #endif 1127 #ifdef SLIOCGETMTU 1128 case SLIOCGETMTU: 1129 *(short *)data = ifp->if_mtu; 1130 break; 1131 #endif 1132 case SIOCADDMULTI: 1133 case SIOCDELMULTI: 1134 break; 1135 1136 case SPPPSETAUTHCFG: 1137 case SPPPGETAUTHCFG: 1138 case SPPPSETLCPCFG: 1139 case SPPPGETLCPCFG: 1140 case SPPPSETIDLETO: 1141 case SPPPSETAUTHFAILURE: 1142 case SPPPGETAUTHFAILURES: 1143 case SPPPSETDNSOPTS: 1144 case SPPPSETKEEPALIVE: 1145 { 1146 struct lwp *l = curlwp; /* XXX */ 1147 1148 if ((error = kauth_authorize_generic(l->l_cred, 1149 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0) 1150 break; 1151 } 1152 /* FALLTHROUGH */ 1153 case SPPPGETSTATUS: 1154 case SPPPGETSTATUSNCP: 1155 case SPPPGETIDLETO: 1156 case SPPPGETDNSOPTS: 1157 case SPPPGETDNSADDRS: 1158 case SPPPGETKEEPALIVE: 1159 error = sppp_params(sp, cmd, data); 1160 break; 1161 1162 default: 1163 error = ENOTTY; 1164 } 1165 splx(s); 1166 return (error); 1167 } 1168 1169 1170 /* 1171 * Cisco framing implementation. 1172 */ 1173 1174 /* 1175 * Handle incoming Cisco keepalive protocol packets. 1176 */ 1177 static void 1178 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1179 { 1180 STDDCL; 1181 struct cisco_packet *h; 1182 #ifdef INET 1183 u_int32_t me, mymask = 0; /* XXX: GCC */ 1184 #endif 1185 1186 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1187 if (debug) 1188 log(LOG_DEBUG, 1189 "%s: cisco invalid packet length: %d bytes\n", 1190 ifp->if_xname, m->m_pkthdr.len); 1191 return; 1192 } 1193 h = mtod(m, struct cisco_packet *); 1194 if (debug) 1195 log(LOG_DEBUG, 1196 "%s: cisco input: %d bytes " 1197 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1198 ifp->if_xname, m->m_pkthdr.len, 1199 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1200 (u_int)h->time0, (u_int)h->time1); 1201 switch (ntohl(h->type)) { 1202 default: 1203 if (debug) 1204 addlog("%s: cisco unknown packet type: 0x%x\n", 1205 ifp->if_xname, ntohl(h->type)); 1206 break; 1207 case CISCO_ADDR_REPLY: 1208 /* Reply on address request, ignore */ 1209 break; 1210 case CISCO_KEEPALIVE_REQ: 1211 sp->pp_alivecnt = 0; 1212 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1213 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1214 /* Local and remote sequence numbers are equal. 1215 * Probably, the line is in loopback mode. */ 1216 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1217 printf ("%s: loopback\n", 1218 ifp->if_xname); 1219 sp->pp_loopcnt = 0; 1220 if (ifp->if_flags & IFF_UP) { 1221 if_down(ifp); 1222 IF_PURGE(&sp->pp_cpq); 1223 } 1224 } 1225 ++sp->pp_loopcnt; 1226 1227 /* Generate new local sequence number */ 1228 sp->pp_seq[IDX_LCP] = arc4random(); 1229 break; 1230 } 1231 sp->pp_loopcnt = 0; 1232 if (! (ifp->if_flags & IFF_UP) && 1233 (ifp->if_flags & IFF_RUNNING)) { 1234 if_up(ifp); 1235 } 1236 break; 1237 case CISCO_ADDR_REQ: 1238 #ifdef INET 1239 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1240 if (me != 0L) 1241 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1242 #endif 1243 break; 1244 } 1245 } 1246 1247 /* 1248 * Send Cisco keepalive packet. 1249 */ 1250 static void 1251 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1252 { 1253 STDDCL; 1254 struct ppp_header *h; 1255 struct cisco_packet *ch; 1256 struct mbuf *m; 1257 u_int32_t t; 1258 1259 t = time_uptime * 1000; 1260 MGETHDR(m, M_DONTWAIT, MT_DATA); 1261 if (! m) 1262 return; 1263 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1264 m->m_pkthdr.rcvif = 0; 1265 1266 h = mtod(m, struct ppp_header *); 1267 h->address = CISCO_MULTICAST; 1268 h->control = 0; 1269 h->protocol = htons(CISCO_KEEPALIVE); 1270 1271 ch = (struct cisco_packet *)(h + 1); 1272 ch->type = htonl(type); 1273 ch->par1 = htonl(par1); 1274 ch->par2 = htonl(par2); 1275 ch->rel = -1; 1276 1277 ch->time0 = htons((u_short)(t >> 16)); 1278 ch->time1 = htons((u_short) t); 1279 1280 if (debug) 1281 log(LOG_DEBUG, 1282 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1283 ifp->if_xname, ntohl(ch->type), ch->par1, 1284 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1285 (u_int)ch->time1); 1286 1287 if (IF_QFULL(&sp->pp_cpq)) { 1288 IF_DROP(&sp->pp_fastq); 1289 IF_DROP(&ifp->if_snd); 1290 m_freem(m); 1291 ++ifp->if_oerrors; 1292 return; 1293 } else 1294 IF_ENQUEUE(&sp->pp_cpq, m); 1295 if (! (ifp->if_flags & IFF_OACTIVE)) 1296 (*ifp->if_start)(ifp); 1297 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1298 } 1299 1300 /* 1301 * PPP protocol implementation. 1302 */ 1303 1304 /* 1305 * Send PPP control protocol packet. 1306 */ 1307 static void 1308 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1309 u_char ident, u_short len, void *data) 1310 { 1311 STDDCL; 1312 struct lcp_header *lh; 1313 struct mbuf *m; 1314 size_t pkthdrlen; 1315 1316 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1317 1318 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1319 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1320 MGETHDR(m, M_DONTWAIT, MT_DATA); 1321 if (! m) 1322 return; 1323 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1324 m->m_pkthdr.rcvif = 0; 1325 1326 if (sp->pp_flags & PP_NOFRAMING) { 1327 *mtod(m, u_int16_t *) = htons(proto); 1328 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1329 } else { 1330 struct ppp_header *h; 1331 h = mtod(m, struct ppp_header *); 1332 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1333 h->control = PPP_UI; /* Unnumbered Info */ 1334 h->protocol = htons(proto); /* Link Control Protocol */ 1335 lh = (struct lcp_header *)(h + 1); 1336 } 1337 lh->type = type; 1338 lh->ident = ident; 1339 lh->len = htons(LCP_HEADER_LEN + len); 1340 if (len) 1341 bcopy (data, lh + 1, len); 1342 1343 if (debug) { 1344 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1345 ifp->if_xname, 1346 sppp_proto_name(proto), 1347 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1348 if (len) 1349 sppp_print_bytes((u_char *)(lh + 1), len); 1350 addlog(">\n"); 1351 } 1352 if (IF_QFULL(&sp->pp_cpq)) { 1353 IF_DROP(&sp->pp_fastq); 1354 IF_DROP(&ifp->if_snd); 1355 m_freem(m); 1356 ++ifp->if_oerrors; 1357 return; 1358 } else 1359 IF_ENQUEUE(&sp->pp_cpq, m); 1360 if (! (ifp->if_flags & IFF_OACTIVE)) 1361 (*ifp->if_start)(ifp); 1362 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1363 } 1364 1365 /* 1366 * Handle incoming PPP control protocol packets. 1367 */ 1368 static void 1369 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1370 { 1371 STDDCL; 1372 struct lcp_header *h; 1373 int printlen, len = m->m_pkthdr.len; 1374 int rv; 1375 u_char *p; 1376 u_int32_t u32; 1377 1378 if (len < 4) { 1379 if (debug) 1380 log(LOG_DEBUG, 1381 "%s: %s invalid packet length: %d bytes\n", 1382 ifp->if_xname, cp->name, len); 1383 return; 1384 } 1385 h = mtod(m, struct lcp_header *); 1386 if (debug) { 1387 printlen = ntohs(h->len); 1388 log(LOG_DEBUG, 1389 "%s: %s input(%s): <%s id=0x%x len=%d", 1390 ifp->if_xname, cp->name, 1391 sppp_state_name(sp->state[cp->protoidx]), 1392 sppp_cp_type_name(h->type), h->ident, printlen); 1393 if (len < printlen) 1394 printlen = len; 1395 if (printlen > 4) 1396 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1397 addlog(">\n"); 1398 } 1399 if (len > ntohs(h->len)) 1400 len = ntohs(h->len); 1401 p = (u_char *)(h + 1); 1402 switch (h->type) { 1403 case CONF_REQ: 1404 if (len < 4) { 1405 if (debug) 1406 addlog("%s: %s invalid conf-req length %d\n", 1407 ifp->if_xname, cp->name, 1408 len); 1409 ++ifp->if_ierrors; 1410 break; 1411 } 1412 /* handle states where RCR doesn't get a SCA/SCN */ 1413 switch (sp->state[cp->protoidx]) { 1414 case STATE_CLOSING: 1415 case STATE_STOPPING: 1416 return; 1417 case STATE_CLOSED: 1418 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1419 0, 0); 1420 return; 1421 } 1422 rv = (cp->RCR)(sp, h, len); 1423 if (rv < 0) { 1424 /* fatal error, shut down */ 1425 (cp->tld)(sp); 1426 sppp_lcp_tlf(sp); 1427 return; 1428 } 1429 switch (sp->state[cp->protoidx]) { 1430 case STATE_OPENED: 1431 (cp->tld)(sp); 1432 (cp->scr)(sp); 1433 /* fall through... */ 1434 case STATE_ACK_SENT: 1435 case STATE_REQ_SENT: 1436 sppp_cp_change_state(cp, sp, rv? 1437 STATE_ACK_SENT: STATE_REQ_SENT); 1438 break; 1439 case STATE_STOPPED: 1440 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1441 (cp->scr)(sp); 1442 sppp_cp_change_state(cp, sp, rv? 1443 STATE_ACK_SENT: STATE_REQ_SENT); 1444 break; 1445 case STATE_ACK_RCVD: 1446 if (rv) { 1447 sppp_cp_change_state(cp, sp, STATE_OPENED); 1448 if (debug) 1449 log(LOG_DEBUG, "%s: %s tlu\n", 1450 ifp->if_xname, 1451 cp->name); 1452 (cp->tlu)(sp); 1453 } else 1454 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1455 break; 1456 default: 1457 printf("%s: %s illegal %s in state %s\n", 1458 ifp->if_xname, cp->name, 1459 sppp_cp_type_name(h->type), 1460 sppp_state_name(sp->state[cp->protoidx])); 1461 ++ifp->if_ierrors; 1462 } 1463 break; 1464 case CONF_ACK: 1465 if (h->ident != sp->confid[cp->protoidx]) { 1466 if (debug) 1467 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1468 ifp->if_xname, cp->name, 1469 h->ident, sp->confid[cp->protoidx]); 1470 ++ifp->if_ierrors; 1471 break; 1472 } 1473 switch (sp->state[cp->protoidx]) { 1474 case STATE_CLOSED: 1475 case STATE_STOPPED: 1476 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1477 break; 1478 case STATE_CLOSING: 1479 case STATE_STOPPING: 1480 break; 1481 case STATE_REQ_SENT: 1482 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1483 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1484 break; 1485 case STATE_OPENED: 1486 (cp->tld)(sp); 1487 /* fall through */ 1488 case STATE_ACK_RCVD: 1489 (cp->scr)(sp); 1490 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1491 break; 1492 case STATE_ACK_SENT: 1493 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1494 sppp_cp_change_state(cp, sp, STATE_OPENED); 1495 if (debug) 1496 log(LOG_DEBUG, "%s: %s tlu\n", 1497 ifp->if_xname, cp->name); 1498 (cp->tlu)(sp); 1499 break; 1500 default: 1501 printf("%s: %s illegal %s in state %s\n", 1502 ifp->if_xname, cp->name, 1503 sppp_cp_type_name(h->type), 1504 sppp_state_name(sp->state[cp->protoidx])); 1505 ++ifp->if_ierrors; 1506 } 1507 break; 1508 case CONF_NAK: 1509 case CONF_REJ: 1510 if (h->ident != sp->confid[cp->protoidx]) { 1511 if (debug) 1512 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1513 ifp->if_xname, cp->name, 1514 h->ident, sp->confid[cp->protoidx]); 1515 ++ifp->if_ierrors; 1516 break; 1517 } 1518 if (h->type == CONF_NAK) 1519 (cp->RCN_nak)(sp, h, len); 1520 else /* CONF_REJ */ 1521 (cp->RCN_rej)(sp, h, len); 1522 1523 switch (sp->state[cp->protoidx]) { 1524 case STATE_CLOSED: 1525 case STATE_STOPPED: 1526 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1527 break; 1528 case STATE_REQ_SENT: 1529 case STATE_ACK_SENT: 1530 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1531 (cp->scr)(sp); 1532 break; 1533 case STATE_OPENED: 1534 (cp->tld)(sp); 1535 /* fall through */ 1536 case STATE_ACK_RCVD: 1537 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1538 (cp->scr)(sp); 1539 break; 1540 case STATE_CLOSING: 1541 case STATE_STOPPING: 1542 break; 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 1552 case TERM_REQ: 1553 switch (sp->state[cp->protoidx]) { 1554 case STATE_ACK_RCVD: 1555 case STATE_ACK_SENT: 1556 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1557 /* fall through */ 1558 case STATE_CLOSED: 1559 case STATE_STOPPED: 1560 case STATE_CLOSING: 1561 case STATE_STOPPING: 1562 case STATE_REQ_SENT: 1563 sta: 1564 /* Send Terminate-Ack packet. */ 1565 if (debug) 1566 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1567 ifp->if_xname, cp->name); 1568 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1569 break; 1570 case STATE_OPENED: 1571 (cp->tld)(sp); 1572 sp->rst_counter[cp->protoidx] = 0; 1573 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1574 goto sta; 1575 default: 1576 printf("%s: %s illegal %s in state %s\n", 1577 ifp->if_xname, cp->name, 1578 sppp_cp_type_name(h->type), 1579 sppp_state_name(sp->state[cp->protoidx])); 1580 ++ifp->if_ierrors; 1581 } 1582 break; 1583 case TERM_ACK: 1584 switch (sp->state[cp->protoidx]) { 1585 case STATE_CLOSED: 1586 case STATE_STOPPED: 1587 case STATE_REQ_SENT: 1588 case STATE_ACK_SENT: 1589 break; 1590 case STATE_CLOSING: 1591 (cp->tlf)(sp); 1592 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1593 sppp_lcp_check_and_close(sp); 1594 break; 1595 case STATE_STOPPING: 1596 (cp->tlf)(sp); 1597 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1598 sppp_lcp_check_and_close(sp); 1599 break; 1600 case STATE_ACK_RCVD: 1601 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1602 break; 1603 case STATE_OPENED: 1604 (cp->tld)(sp); 1605 (cp->scr)(sp); 1606 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1607 break; 1608 default: 1609 printf("%s: %s illegal %s in state %s\n", 1610 ifp->if_xname, cp->name, 1611 sppp_cp_type_name(h->type), 1612 sppp_state_name(sp->state[cp->protoidx])); 1613 ++ifp->if_ierrors; 1614 } 1615 break; 1616 case CODE_REJ: 1617 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1618 log(LOG_INFO, 1619 "%s: %s: ignoring RXJ (%s) for code ?, " 1620 "danger will robinson\n", 1621 ifp->if_xname, cp->name, 1622 sppp_cp_type_name(h->type)); 1623 switch (sp->state[cp->protoidx]) { 1624 case STATE_CLOSED: 1625 case STATE_STOPPED: 1626 case STATE_REQ_SENT: 1627 case STATE_ACK_SENT: 1628 case STATE_CLOSING: 1629 case STATE_STOPPING: 1630 case STATE_OPENED: 1631 break; 1632 case STATE_ACK_RCVD: 1633 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1634 break; 1635 default: 1636 printf("%s: %s illegal %s in state %s\n", 1637 ifp->if_xname, cp->name, 1638 sppp_cp_type_name(h->type), 1639 sppp_state_name(sp->state[cp->protoidx])); 1640 ++ifp->if_ierrors; 1641 } 1642 break; 1643 case PROTO_REJ: 1644 { 1645 int catastrophic; 1646 const struct cp *upper; 1647 int i; 1648 u_int16_t proto; 1649 1650 catastrophic = 0; 1651 upper = NULL; 1652 proto = p[0] << 8 | p[1]; 1653 for (i = 0; i < IDX_COUNT; i++) { 1654 if (cps[i]->proto == proto) { 1655 upper = cps[i]; 1656 break; 1657 } 1658 } 1659 if (upper == NULL) 1660 catastrophic++; 1661 1662 if (debug) 1663 log(LOG_INFO, 1664 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1665 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1666 sppp_cp_type_name(h->type), proto, 1667 upper ? upper->name : "unknown", 1668 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1669 1670 /* 1671 * if we got RXJ+ against conf-req, the peer does not implement 1672 * this particular protocol type. terminate the protocol. 1673 */ 1674 if (upper && !catastrophic) { 1675 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1676 upper->Close(sp); 1677 break; 1678 } 1679 } 1680 1681 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1682 switch (sp->state[cp->protoidx]) { 1683 case STATE_CLOSED: 1684 case STATE_STOPPED: 1685 case STATE_REQ_SENT: 1686 case STATE_ACK_SENT: 1687 case STATE_CLOSING: 1688 case STATE_STOPPING: 1689 case STATE_OPENED: 1690 break; 1691 case STATE_ACK_RCVD: 1692 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1693 break; 1694 default: 1695 printf("%s: %s illegal %s in state %s\n", 1696 ifp->if_xname, cp->name, 1697 sppp_cp_type_name(h->type), 1698 sppp_state_name(sp->state[cp->protoidx])); 1699 ++ifp->if_ierrors; 1700 } 1701 break; 1702 } 1703 case DISC_REQ: 1704 if (cp->proto != PPP_LCP) 1705 goto illegal; 1706 /* Discard the packet. */ 1707 break; 1708 case ECHO_REQ: 1709 if (cp->proto != PPP_LCP) 1710 goto illegal; 1711 if (sp->state[cp->protoidx] != STATE_OPENED) { 1712 if (debug) 1713 addlog("%s: lcp echo req but lcp closed\n", 1714 ifp->if_xname); 1715 ++ifp->if_ierrors; 1716 break; 1717 } 1718 if (len < 8) { 1719 if (debug) 1720 addlog("%s: invalid lcp echo request " 1721 "packet length: %d bytes\n", 1722 ifp->if_xname, len); 1723 break; 1724 } 1725 memcpy(&u32, h + 1, sizeof u32); 1726 if (ntohl(u32) == sp->lcp.magic) { 1727 /* Line loopback mode detected. */ 1728 printf("%s: loopback\n", ifp->if_xname); 1729 if_down(ifp); 1730 IF_PURGE(&sp->pp_cpq); 1731 1732 /* Shut down the PPP link. */ 1733 /* XXX */ 1734 lcp.Down(sp); 1735 lcp.Up(sp); 1736 break; 1737 } 1738 u32 = htonl(sp->lcp.magic); 1739 memcpy(h + 1, &u32, sizeof u32); 1740 if (debug) 1741 addlog("%s: got lcp echo req, sending echo rep\n", 1742 ifp->if_xname); 1743 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1744 h + 1); 1745 break; 1746 case ECHO_REPLY: 1747 if (cp->proto != PPP_LCP) 1748 goto illegal; 1749 if (h->ident != sp->lcp.echoid) { 1750 ++ifp->if_ierrors; 1751 break; 1752 } 1753 if (len < 8) { 1754 if (debug) 1755 addlog("%s: lcp invalid echo reply " 1756 "packet length: %d bytes\n", 1757 ifp->if_xname, len); 1758 break; 1759 } 1760 if (debug) 1761 addlog("%s: lcp got echo rep\n", 1762 ifp->if_xname); 1763 memcpy(&u32, h + 1, sizeof u32); 1764 if (ntohl(u32) != sp->lcp.magic) 1765 sp->pp_alivecnt = 0; 1766 break; 1767 default: 1768 /* Unknown packet type -- send Code-Reject packet. */ 1769 illegal: 1770 if (debug) 1771 addlog("%s: %s send code-rej for 0x%x\n", 1772 ifp->if_xname, cp->name, h->type); 1773 sppp_cp_send(sp, cp->proto, CODE_REJ, 1774 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1775 ++ifp->if_ierrors; 1776 } 1777 } 1778 1779 1780 /* 1781 * The generic part of all Up/Down/Open/Close/TO event handlers. 1782 * Basically, the state transition handling in the automaton. 1783 */ 1784 static void 1785 sppp_up_event(const struct cp *cp, struct sppp *sp) 1786 { 1787 STDDCL; 1788 1789 if (debug) 1790 log(LOG_DEBUG, "%s: %s up(%s)\n", 1791 ifp->if_xname, cp->name, 1792 sppp_state_name(sp->state[cp->protoidx])); 1793 1794 switch (sp->state[cp->protoidx]) { 1795 case STATE_INITIAL: 1796 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1797 break; 1798 case STATE_STARTING: 1799 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1800 (cp->scr)(sp); 1801 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1802 break; 1803 default: 1804 printf("%s: %s illegal up in state %s\n", 1805 ifp->if_xname, cp->name, 1806 sppp_state_name(sp->state[cp->protoidx])); 1807 } 1808 } 1809 1810 static void 1811 sppp_down_event(const struct cp *cp, struct sppp *sp) 1812 { 1813 STDDCL; 1814 1815 if (debug) 1816 log(LOG_DEBUG, "%s: %s down(%s)\n", 1817 ifp->if_xname, cp->name, 1818 sppp_state_name(sp->state[cp->protoidx])); 1819 1820 switch (sp->state[cp->protoidx]) { 1821 case STATE_CLOSED: 1822 case STATE_CLOSING: 1823 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1824 break; 1825 case STATE_STOPPED: 1826 (cp->tls)(sp); 1827 /* fall through */ 1828 case STATE_STOPPING: 1829 case STATE_REQ_SENT: 1830 case STATE_ACK_RCVD: 1831 case STATE_ACK_SENT: 1832 sppp_cp_change_state(cp, sp, STATE_STARTING); 1833 break; 1834 case STATE_OPENED: 1835 (cp->tld)(sp); 1836 sppp_cp_change_state(cp, sp, STATE_STARTING); 1837 break; 1838 default: 1839 printf("%s: %s illegal down in state %s\n", 1840 ifp->if_xname, cp->name, 1841 sppp_state_name(sp->state[cp->protoidx])); 1842 } 1843 } 1844 1845 1846 static void 1847 sppp_open_event(const struct cp *cp, struct sppp *sp) 1848 { 1849 STDDCL; 1850 1851 if (debug) 1852 log(LOG_DEBUG, "%s: %s open(%s)\n", 1853 ifp->if_xname, cp->name, 1854 sppp_state_name(sp->state[cp->protoidx])); 1855 1856 switch (sp->state[cp->protoidx]) { 1857 case STATE_INITIAL: 1858 sppp_cp_change_state(cp, sp, STATE_STARTING); 1859 (cp->tls)(sp); 1860 break; 1861 case STATE_STARTING: 1862 break; 1863 case STATE_CLOSED: 1864 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1865 (cp->scr)(sp); 1866 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1867 break; 1868 case STATE_STOPPED: 1869 case STATE_STOPPING: 1870 case STATE_REQ_SENT: 1871 case STATE_ACK_RCVD: 1872 case STATE_ACK_SENT: 1873 case STATE_OPENED: 1874 break; 1875 case STATE_CLOSING: 1876 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1877 break; 1878 } 1879 } 1880 1881 1882 static void 1883 sppp_close_event(const struct cp *cp, struct sppp *sp) 1884 { 1885 STDDCL; 1886 1887 if (debug) 1888 log(LOG_DEBUG, "%s: %s close(%s)\n", 1889 ifp->if_xname, cp->name, 1890 sppp_state_name(sp->state[cp->protoidx])); 1891 1892 switch (sp->state[cp->protoidx]) { 1893 case STATE_INITIAL: 1894 case STATE_CLOSED: 1895 case STATE_CLOSING: 1896 break; 1897 case STATE_STARTING: 1898 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1899 (cp->tlf)(sp); 1900 break; 1901 case STATE_STOPPED: 1902 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1903 break; 1904 case STATE_STOPPING: 1905 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1906 break; 1907 case STATE_OPENED: 1908 (cp->tld)(sp); 1909 /* fall through */ 1910 case STATE_REQ_SENT: 1911 case STATE_ACK_RCVD: 1912 case STATE_ACK_SENT: 1913 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1914 sppp_cp_send(sp, cp->proto, TERM_REQ, 1915 ++sp->pp_seq[cp->protoidx], 0, 0); 1916 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1917 break; 1918 } 1919 } 1920 1921 static void 1922 sppp_to_event(const struct cp *cp, struct sppp *sp) 1923 { 1924 STDDCL; 1925 int s; 1926 1927 s = splnet(); 1928 if (debug) 1929 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1930 ifp->if_xname, cp->name, 1931 sppp_state_name(sp->state[cp->protoidx]), 1932 sp->rst_counter[cp->protoidx]); 1933 1934 if (--sp->rst_counter[cp->protoidx] < 0) 1935 /* TO- event */ 1936 switch (sp->state[cp->protoidx]) { 1937 case STATE_CLOSING: 1938 (cp->tlf)(sp); 1939 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1940 sppp_lcp_check_and_close(sp); 1941 break; 1942 case STATE_STOPPING: 1943 (cp->tlf)(sp); 1944 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1945 sppp_lcp_check_and_close(sp); 1946 break; 1947 case STATE_REQ_SENT: 1948 case STATE_ACK_RCVD: 1949 case STATE_ACK_SENT: 1950 (cp->tlf)(sp); 1951 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1952 sppp_lcp_check_and_close(sp); 1953 break; 1954 } 1955 else 1956 /* TO+ event */ 1957 switch (sp->state[cp->protoidx]) { 1958 case STATE_CLOSING: 1959 case STATE_STOPPING: 1960 sppp_cp_send(sp, cp->proto, TERM_REQ, 1961 ++sp->pp_seq[cp->protoidx], 0, 0); 1962 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1963 cp->TO, sp); 1964 break; 1965 case STATE_REQ_SENT: 1966 case STATE_ACK_RCVD: 1967 (cp->scr)(sp); 1968 /* sppp_cp_change_state() will restart the timer */ 1969 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1970 break; 1971 case STATE_ACK_SENT: 1972 (cp->scr)(sp); 1973 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1974 cp->TO, sp); 1975 break; 1976 } 1977 1978 splx(s); 1979 } 1980 1981 /* 1982 * Change the state of a control protocol in the state automaton. 1983 * Takes care of starting/stopping the restart timer. 1984 */ 1985 void 1986 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1987 { 1988 sp->state[cp->protoidx] = newstate; 1989 callout_stop(&sp->ch[cp->protoidx]); 1990 switch (newstate) { 1991 case STATE_INITIAL: 1992 case STATE_STARTING: 1993 case STATE_CLOSED: 1994 case STATE_STOPPED: 1995 case STATE_OPENED: 1996 break; 1997 case STATE_CLOSING: 1998 case STATE_STOPPING: 1999 case STATE_REQ_SENT: 2000 case STATE_ACK_RCVD: 2001 case STATE_ACK_SENT: 2002 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2003 cp->TO, sp); 2004 break; 2005 } 2006 } 2007 2008 /* 2009 *--------------------------------------------------------------------------* 2010 * * 2011 * The LCP implementation. * 2012 * * 2013 *--------------------------------------------------------------------------* 2014 */ 2015 static void 2016 sppp_lcp_init(struct sppp *sp) 2017 { 2018 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2019 sp->lcp.magic = 0; 2020 sp->state[IDX_LCP] = STATE_INITIAL; 2021 sp->fail_counter[IDX_LCP] = 0; 2022 sp->pp_seq[IDX_LCP] = 0; 2023 sp->pp_rseq[IDX_LCP] = 0; 2024 sp->lcp.protos = 0; 2025 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2026 2027 /* 2028 * Initialize counters and timeout values. Note that we don't 2029 * use the 3 seconds suggested in RFC 1661 since we are likely 2030 * running on a fast link. XXX We should probably implement 2031 * the exponential backoff option. Note that these values are 2032 * relevant for all control protocols, not just LCP only. 2033 */ 2034 sp->lcp.timeout = 1 * hz; 2035 sp->lcp.max_terminate = 2; 2036 sp->lcp.max_configure = 10; 2037 sp->lcp.max_failure = 10; 2038 callout_init(&sp->ch[IDX_LCP]); 2039 } 2040 2041 static void 2042 sppp_lcp_up(struct sppp *sp) 2043 { 2044 STDDCL; 2045 2046 /* Initialize activity timestamp: opening a connection is an activity */ 2047 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2048 2049 /* 2050 * If this interface is passive or dial-on-demand, and we are 2051 * still in Initial state, it means we've got an incoming 2052 * call. Activate the interface. 2053 */ 2054 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2055 if (debug) 2056 log(LOG_DEBUG, 2057 "%s: Up event", ifp->if_xname); 2058 ifp->if_flags |= IFF_RUNNING; 2059 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2060 if (debug) 2061 addlog("(incoming call)\n"); 2062 sp->pp_flags |= PP_CALLIN; 2063 lcp.Open(sp); 2064 } else if (debug) 2065 addlog("\n"); 2066 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2067 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2068 ifp->if_flags |= IFF_RUNNING; 2069 lcp.Open(sp); 2070 } 2071 2072 sppp_up_event(&lcp, sp); 2073 } 2074 2075 static void 2076 sppp_lcp_down(struct sppp *sp) 2077 { 2078 STDDCL; 2079 2080 sppp_down_event(&lcp, sp); 2081 2082 /* 2083 * If this is neither a dial-on-demand nor a passive 2084 * interface, simulate an ``ifconfig down'' action, so the 2085 * administrator can force a redial by another ``ifconfig 2086 * up''. XXX For leased line operation, should we immediately 2087 * try to reopen the connection here? 2088 */ 2089 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2090 if (debug) 2091 log(LOG_INFO, 2092 "%s: Down event (carrier loss), taking interface down.\n", 2093 ifp->if_xname); 2094 if_down(ifp); 2095 } else { 2096 if (debug) 2097 log(LOG_DEBUG, 2098 "%s: Down event (carrier loss)\n", 2099 ifp->if_xname); 2100 } 2101 sp->pp_flags &= ~PP_CALLIN; 2102 if (sp->state[IDX_LCP] != STATE_INITIAL) 2103 lcp.Close(sp); 2104 ifp->if_flags &= ~IFF_RUNNING; 2105 } 2106 2107 static void 2108 sppp_lcp_open(struct sppp *sp) 2109 { 2110 /* 2111 * If we are authenticator, negotiate LCP_AUTH 2112 */ 2113 if (sp->hisauth.proto != 0) 2114 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2115 else 2116 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2117 sp->pp_flags &= ~PP_NEEDAUTH; 2118 sppp_open_event(&lcp, sp); 2119 } 2120 2121 static void 2122 sppp_lcp_close(struct sppp *sp) 2123 { 2124 sppp_close_event(&lcp, sp); 2125 } 2126 2127 static void 2128 sppp_lcp_TO(void *cookie) 2129 { 2130 sppp_to_event(&lcp, (struct sppp *)cookie); 2131 } 2132 2133 /* 2134 * Analyze a configure request. Return true if it was agreeable, and 2135 * caused action sca, false if it has been rejected or nak'ed, and 2136 * caused action scn. (The return value is used to make the state 2137 * transition decision in the state automaton.) 2138 */ 2139 static int 2140 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2141 { 2142 STDDCL; 2143 u_char *buf, *r, *p; 2144 int origlen, rlen; 2145 u_int32_t nmagic; 2146 u_short authproto; 2147 2148 len -= 4; 2149 origlen = len; 2150 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2151 if (! buf) 2152 return (0); 2153 2154 if (debug) 2155 log(LOG_DEBUG, "%s: lcp parse opts:", 2156 ifp->if_xname); 2157 2158 /* pass 1: check for things that need to be rejected */ 2159 p = (void *)(h + 1); 2160 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2161 /* Sanity check option length */ 2162 if (p[1] > len) { 2163 /* 2164 * Malicious option - drop imediately. 2165 * XXX Maybe we should just RXJ it? 2166 */ 2167 addlog("%s: received malicious LCP option 0x%02x, " 2168 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2169 p[0], p[1], len); 2170 goto drop; 2171 } 2172 if (debug) 2173 addlog(" %s", sppp_lcp_opt_name(*p)); 2174 switch (*p) { 2175 case LCP_OPT_MAGIC: 2176 /* Magic number. */ 2177 /* fall through, both are same length */ 2178 case LCP_OPT_ASYNC_MAP: 2179 /* Async control character map. */ 2180 if (len >= 6 || p[1] == 6) 2181 continue; 2182 if (debug) 2183 addlog(" [invalid]"); 2184 break; 2185 case LCP_OPT_MRU: 2186 /* Maximum receive unit. */ 2187 if (len >= 4 && p[1] == 4) 2188 continue; 2189 if (debug) 2190 addlog(" [invalid]"); 2191 break; 2192 case LCP_OPT_AUTH_PROTO: 2193 if (len < 4) { 2194 if (debug) 2195 addlog(" [invalid]"); 2196 break; 2197 } 2198 authproto = (p[2] << 8) + p[3]; 2199 if (authproto == PPP_CHAP && p[1] != 5) { 2200 if (debug) 2201 addlog(" [invalid chap len]"); 2202 break; 2203 } 2204 if (sp->myauth.proto == 0) { 2205 /* we are not configured to do auth */ 2206 if (debug) 2207 addlog(" [not configured]"); 2208 break; 2209 } 2210 /* 2211 * Remote want us to authenticate, remember this, 2212 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2213 * up. 2214 */ 2215 sp->pp_flags |= PP_NEEDAUTH; 2216 continue; 2217 default: 2218 /* Others not supported. */ 2219 if (debug) 2220 addlog(" [rej]"); 2221 break; 2222 } 2223 /* Add the option to rejected list. */ 2224 bcopy (p, r, p[1]); 2225 r += p[1]; 2226 rlen += p[1]; 2227 } 2228 if (rlen) { 2229 if (debug) 2230 addlog(" send conf-rej\n"); 2231 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2232 goto end; 2233 } else if (debug) 2234 addlog("\n"); 2235 2236 /* 2237 * pass 2: check for option values that are unacceptable and 2238 * thus require to be nak'ed. 2239 */ 2240 if (debug) 2241 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2242 ifp->if_xname); 2243 2244 p = (void *)(h + 1); 2245 len = origlen; 2246 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2247 if (debug) 2248 addlog(" %s", sppp_lcp_opt_name(*p)); 2249 switch (*p) { 2250 case LCP_OPT_MAGIC: 2251 /* Magic number -- extract. */ 2252 nmagic = (u_int32_t)p[2] << 24 | 2253 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2254 if (nmagic != sp->lcp.magic) { 2255 if (debug) 2256 addlog(" 0x%x", nmagic); 2257 continue; 2258 } 2259 /* 2260 * Local and remote magics equal -- loopback? 2261 */ 2262 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2263 printf ("%s: loopback\n", 2264 ifp->if_xname); 2265 sp->pp_loopcnt = 0; 2266 if (ifp->if_flags & IFF_UP) { 2267 if_down(ifp); 2268 IF_PURGE(&sp->pp_cpq); 2269 /* XXX ? */ 2270 lcp.Down(sp); 2271 lcp.Up(sp); 2272 } 2273 } else if (debug) 2274 addlog(" [glitch]"); 2275 ++sp->pp_loopcnt; 2276 /* 2277 * We negate our magic here, and NAK it. If 2278 * we see it later in an NAK packet, we 2279 * suggest a new one. 2280 */ 2281 nmagic = ~sp->lcp.magic; 2282 /* Gonna NAK it. */ 2283 p[2] = nmagic >> 24; 2284 p[3] = nmagic >> 16; 2285 p[4] = nmagic >> 8; 2286 p[5] = nmagic; 2287 break; 2288 2289 case LCP_OPT_ASYNC_MAP: 2290 /* 2291 * Async control character map -- just ignore it. 2292 * 2293 * Quote from RFC 1662, chapter 6: 2294 * To enable this functionality, synchronous PPP 2295 * implementations MUST always respond to the 2296 * Async-Control-Character-Map Configuration 2297 * Option with the LCP Configure-Ack. However, 2298 * acceptance of the Configuration Option does 2299 * not imply that the synchronous implementation 2300 * will do any ACCM mapping. Instead, all such 2301 * octet mapping will be performed by the 2302 * asynchronous-to-synchronous converter. 2303 */ 2304 continue; 2305 2306 case LCP_OPT_MRU: 2307 /* 2308 * Maximum receive unit. Always agreeable, 2309 * but ignored by now. 2310 */ 2311 sp->lcp.their_mru = p[2] * 256 + p[3]; 2312 if (debug) 2313 addlog(" %ld", sp->lcp.their_mru); 2314 continue; 2315 2316 case LCP_OPT_AUTH_PROTO: 2317 authproto = (p[2] << 8) + p[3]; 2318 if (sp->myauth.proto != authproto) { 2319 /* not agreed, nak */ 2320 if (debug) 2321 addlog(" [mine %s != his %s]", 2322 sppp_proto_name(sp->myauth.proto), 2323 sppp_proto_name(authproto)); 2324 p[2] = sp->myauth.proto >> 8; 2325 p[3] = sp->myauth.proto; 2326 break; 2327 } 2328 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2329 if (debug) 2330 addlog(" [chap not MD5]"); 2331 p[4] = CHAP_MD5; 2332 break; 2333 } 2334 continue; 2335 } 2336 /* Add the option to nak'ed list. */ 2337 bcopy (p, r, p[1]); 2338 r += p[1]; 2339 rlen += p[1]; 2340 } 2341 if (rlen) { 2342 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2343 if (debug) 2344 addlog(" max_failure (%d) exceeded, " 2345 "send conf-rej\n", 2346 sp->lcp.max_failure); 2347 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2348 } else { 2349 if (debug) 2350 addlog(" send conf-nak\n"); 2351 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2352 } 2353 goto end; 2354 } else { 2355 if (debug) 2356 addlog(" send conf-ack\n"); 2357 sp->fail_counter[IDX_LCP] = 0; 2358 sp->pp_loopcnt = 0; 2359 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2360 } 2361 2362 end: 2363 free(buf, M_TEMP); 2364 return (rlen == 0); 2365 2366 drop: 2367 free(buf, M_TEMP); 2368 return -1; 2369 } 2370 2371 /* 2372 * Analyze the LCP Configure-Reject option list, and adjust our 2373 * negotiation. 2374 */ 2375 static void 2376 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2377 { 2378 STDDCL; 2379 u_char *buf, *p; 2380 2381 len -= 4; 2382 buf = malloc (len, M_TEMP, M_NOWAIT); 2383 if (!buf) 2384 return; 2385 2386 if (debug) 2387 log(LOG_DEBUG, "%s: lcp rej opts:", 2388 ifp->if_xname); 2389 2390 p = (void *)(h + 1); 2391 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2392 /* Sanity check option length */ 2393 if (p[1] > len) { 2394 /* 2395 * Malicious option - drop imediately. 2396 * XXX Maybe we should just RXJ it? 2397 */ 2398 addlog("%s: received malicious LCP option, " 2399 "dropping.\n", ifp->if_xname); 2400 goto drop; 2401 } 2402 if (debug) 2403 addlog(" %s", sppp_lcp_opt_name(*p)); 2404 switch (*p) { 2405 case LCP_OPT_MAGIC: 2406 /* Magic number -- can't use it, use 0 */ 2407 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2408 sp->lcp.magic = 0; 2409 break; 2410 case LCP_OPT_MRU: 2411 /* 2412 * Should not be rejected anyway, since we only 2413 * negotiate a MRU if explicitly requested by 2414 * peer. 2415 */ 2416 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2417 break; 2418 case LCP_OPT_AUTH_PROTO: 2419 /* 2420 * Peer doesn't want to authenticate himself, 2421 * deny unless this is a dialout call, and 2422 * SPPP_AUTHFLAG_NOCALLOUT is set. 2423 */ 2424 if ((sp->pp_flags & PP_CALLIN) == 0 && 2425 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2426 if (debug) 2427 addlog(" [don't insist on auth " 2428 "for callout]"); 2429 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2430 break; 2431 } 2432 if (debug) 2433 addlog("[access denied]\n"); 2434 lcp.Close(sp); 2435 break; 2436 } 2437 } 2438 if (debug) 2439 addlog("\n"); 2440 drop: 2441 free(buf, M_TEMP); 2442 return; 2443 } 2444 2445 /* 2446 * Analyze the LCP Configure-NAK option list, and adjust our 2447 * negotiation. 2448 */ 2449 static void 2450 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2451 { 2452 STDDCL; 2453 u_char *buf, *p; 2454 u_int32_t magic; 2455 2456 len -= 4; 2457 buf = malloc (len, M_TEMP, M_NOWAIT); 2458 if (!buf) 2459 return; 2460 2461 if (debug) 2462 log(LOG_DEBUG, "%s: lcp nak opts:", 2463 ifp->if_xname); 2464 2465 p = (void *)(h + 1); 2466 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2467 /* Sanity check option length */ 2468 if (p[1] > len) { 2469 /* 2470 * Malicious option - drop imediately. 2471 * XXX Maybe we should just RXJ it? 2472 */ 2473 addlog("%s: received malicious LCP option, " 2474 "dropping.\n", ifp->if_xname); 2475 goto drop; 2476 } 2477 if (debug) 2478 addlog(" %s", sppp_lcp_opt_name(*p)); 2479 switch (*p) { 2480 case LCP_OPT_MAGIC: 2481 /* Magic number -- renegotiate */ 2482 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2483 len >= 6 && p[1] == 6) { 2484 magic = (u_int32_t)p[2] << 24 | 2485 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2486 /* 2487 * If the remote magic is our negated one, 2488 * this looks like a loopback problem. 2489 * Suggest a new magic to make sure. 2490 */ 2491 if (magic == ~sp->lcp.magic) { 2492 if (debug) 2493 addlog(" magic glitch"); 2494 sp->lcp.magic = arc4random(); 2495 } else { 2496 sp->lcp.magic = magic; 2497 if (debug) 2498 addlog(" %d", magic); 2499 } 2500 } 2501 break; 2502 case LCP_OPT_MRU: 2503 /* 2504 * Peer wants to advise us to negotiate an MRU. 2505 * Agree on it if it's reasonable, or use 2506 * default otherwise. 2507 */ 2508 if (len >= 4 && p[1] == 4) { 2509 u_int mru = p[2] * 256 + p[3]; 2510 if (debug) 2511 addlog(" %d", mru); 2512 if (mru < PP_MTU || mru > PP_MAX_MRU) 2513 mru = PP_MTU; 2514 sp->lcp.mru = mru; 2515 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2516 } 2517 break; 2518 case LCP_OPT_AUTH_PROTO: 2519 /* 2520 * Peer doesn't like our authentication method, 2521 * deny. 2522 */ 2523 if (debug) 2524 addlog("[access denied]\n"); 2525 lcp.Close(sp); 2526 break; 2527 } 2528 } 2529 if (debug) 2530 addlog("\n"); 2531 drop: 2532 free(buf, M_TEMP); 2533 return; 2534 } 2535 2536 static void 2537 sppp_lcp_tlu(struct sppp *sp) 2538 { 2539 STDDCL; 2540 int i; 2541 u_int32_t mask; 2542 2543 /* XXX ? */ 2544 if (! (ifp->if_flags & IFF_UP) && 2545 (ifp->if_flags & IFF_RUNNING)) { 2546 /* Coming out of loopback mode. */ 2547 if_up(ifp); 2548 } 2549 2550 for (i = 0; i < IDX_COUNT; i++) 2551 if ((cps[i])->flags & CP_QUAL) 2552 (cps[i])->Open(sp); 2553 2554 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2555 (sp->pp_flags & PP_NEEDAUTH) != 0) 2556 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2557 else 2558 sp->pp_phase = SPPP_PHASE_NETWORK; 2559 2560 if (debug) 2561 { 2562 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2563 sppp_phase_name(sp->pp_phase)); 2564 } 2565 2566 /* 2567 * Open all authentication protocols. This is even required 2568 * if we already proceeded to network phase, since it might be 2569 * that remote wants us to authenticate, so we might have to 2570 * send a PAP request. Undesired authentication protocols 2571 * don't do anything when they get an Open event. 2572 */ 2573 for (i = 0; i < IDX_COUNT; i++) 2574 if ((cps[i])->flags & CP_AUTH) 2575 (cps[i])->Open(sp); 2576 2577 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2578 /* Notify all NCPs. */ 2579 for (i = 0; i < IDX_COUNT; i++) 2580 if ((cps[i])->flags & CP_NCP) 2581 (cps[i])->Open(sp); 2582 } 2583 2584 /* Send Up events to all started protos. */ 2585 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2586 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2587 (cps[i])->Up(sp); 2588 2589 /* notify low-level driver of state change */ 2590 if (sp->pp_chg) 2591 sp->pp_chg(sp, (int)sp->pp_phase); 2592 2593 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2594 /* if no NCP is starting, close down */ 2595 sppp_lcp_check_and_close(sp); 2596 } 2597 2598 static void 2599 sppp_lcp_tld(struct sppp *sp) 2600 { 2601 STDDCL; 2602 int i; 2603 u_int32_t mask; 2604 2605 sp->pp_phase = SPPP_PHASE_TERMINATE; 2606 2607 if (debug) 2608 { 2609 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2610 sppp_phase_name(sp->pp_phase)); 2611 } 2612 2613 /* 2614 * Take upper layers down. We send the Down event first and 2615 * the Close second to prevent the upper layers from sending 2616 * ``a flurry of terminate-request packets'', as the RFC 2617 * describes it. 2618 */ 2619 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2620 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2621 (cps[i])->Down(sp); 2622 (cps[i])->Close(sp); 2623 } 2624 } 2625 2626 static void 2627 sppp_lcp_tls(struct sppp *sp) 2628 { 2629 STDDCL; 2630 2631 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2632 printf("%s: authentication failed %d times, not retrying again\n", 2633 sp->pp_if.if_xname, sp->pp_auth_failures); 2634 if_down(&sp->pp_if); 2635 return; 2636 } 2637 2638 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2639 2640 if (debug) 2641 { 2642 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2643 sppp_phase_name(sp->pp_phase)); 2644 } 2645 2646 /* Notify lower layer if desired. */ 2647 if (sp->pp_tls) 2648 (sp->pp_tls)(sp); 2649 } 2650 2651 static void 2652 sppp_lcp_tlf(struct sppp *sp) 2653 { 2654 STDDCL; 2655 2656 sp->pp_phase = SPPP_PHASE_DEAD; 2657 2658 if (debug) 2659 { 2660 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2661 sppp_phase_name(sp->pp_phase)); 2662 } 2663 2664 /* Notify lower layer if desired. */ 2665 if (sp->pp_tlf) 2666 (sp->pp_tlf)(sp); 2667 } 2668 2669 static void 2670 sppp_lcp_scr(struct sppp *sp) 2671 { 2672 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2673 int i = 0; 2674 u_short authproto; 2675 2676 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2677 if (! sp->lcp.magic) 2678 sp->lcp.magic = arc4random(); 2679 opt[i++] = LCP_OPT_MAGIC; 2680 opt[i++] = 6; 2681 opt[i++] = sp->lcp.magic >> 24; 2682 opt[i++] = sp->lcp.magic >> 16; 2683 opt[i++] = sp->lcp.magic >> 8; 2684 opt[i++] = sp->lcp.magic; 2685 } 2686 2687 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2688 opt[i++] = LCP_OPT_MRU; 2689 opt[i++] = 4; 2690 opt[i++] = sp->lcp.mru >> 8; 2691 opt[i++] = sp->lcp.mru; 2692 } 2693 2694 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2695 authproto = sp->hisauth.proto; 2696 opt[i++] = LCP_OPT_AUTH_PROTO; 2697 opt[i++] = authproto == PPP_CHAP? 5: 4; 2698 opt[i++] = authproto >> 8; 2699 opt[i++] = authproto; 2700 if (authproto == PPP_CHAP) 2701 opt[i++] = CHAP_MD5; 2702 } 2703 2704 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2705 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2706 } 2707 2708 /* 2709 * Check the open NCPs, return true if at least one NCP is open. 2710 */ 2711 static int 2712 sppp_ncp_check(struct sppp *sp) 2713 { 2714 int i, mask; 2715 2716 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2717 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2718 return 1; 2719 return 0; 2720 } 2721 2722 /* 2723 * Re-check the open NCPs and see if we should terminate the link. 2724 * Called by the NCPs during their tlf action handling. 2725 */ 2726 static void 2727 sppp_lcp_check_and_close(struct sppp *sp) 2728 { 2729 2730 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2731 /* don't bother, we are already going down */ 2732 return; 2733 2734 if (sppp_ncp_check(sp)) 2735 return; 2736 2737 lcp.Close(sp); 2738 } 2739 2740 2741 /* 2742 *--------------------------------------------------------------------------* 2743 * * 2744 * The IPCP implementation. * 2745 * * 2746 *--------------------------------------------------------------------------* 2747 */ 2748 2749 static void 2750 sppp_ipcp_init(struct sppp *sp) 2751 { 2752 sp->ipcp.opts = 0; 2753 sp->ipcp.flags = 0; 2754 sp->state[IDX_IPCP] = STATE_INITIAL; 2755 sp->fail_counter[IDX_IPCP] = 0; 2756 sp->pp_seq[IDX_IPCP] = 0; 2757 sp->pp_rseq[IDX_IPCP] = 0; 2758 callout_init(&sp->ch[IDX_IPCP]); 2759 } 2760 2761 static void 2762 sppp_ipcp_up(struct sppp *sp) 2763 { 2764 sppp_up_event(&ipcp, sp); 2765 } 2766 2767 static void 2768 sppp_ipcp_down(struct sppp *sp) 2769 { 2770 sppp_down_event(&ipcp, sp); 2771 } 2772 2773 static void 2774 sppp_ipcp_open(struct sppp *sp) 2775 { 2776 STDDCL; 2777 u_int32_t myaddr, hisaddr; 2778 2779 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2780 sp->ipcp.req_myaddr = 0; 2781 sp->ipcp.req_hisaddr = 0; 2782 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2783 2784 #ifdef INET 2785 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2786 #else 2787 myaddr = hisaddr = 0; 2788 #endif 2789 /* 2790 * If we don't have his address, this probably means our 2791 * interface doesn't want to talk IP at all. (This could 2792 * be the case if somebody wants to speak only IPX, for 2793 * example.) Don't open IPCP in this case. 2794 */ 2795 if (hisaddr == 0) { 2796 /* XXX this message should go away */ 2797 if (debug) 2798 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2799 ifp->if_xname); 2800 return; 2801 } 2802 2803 if (myaddr == 0) { 2804 /* 2805 * I don't have an assigned address, so i need to 2806 * negotiate my address. 2807 */ 2808 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2809 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2810 } 2811 if (hisaddr == 1) { 2812 /* 2813 * XXX - remove this hack! 2814 * remote has no valid address, we need to get one assigned. 2815 */ 2816 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2817 } 2818 sppp_open_event(&ipcp, sp); 2819 } 2820 2821 static void 2822 sppp_ipcp_close(struct sppp *sp) 2823 { 2824 STDDCL; 2825 2826 sppp_close_event(&ipcp, sp); 2827 #ifdef INET 2828 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2829 /* 2830 * Some address was dynamic, clear it again. 2831 */ 2832 sppp_clear_ip_addrs(sp); 2833 #endif 2834 2835 if (sp->pp_saved_mtu > 0) { 2836 ifp->if_mtu = sp->pp_saved_mtu; 2837 sp->pp_saved_mtu = 0; 2838 if (debug) 2839 log(LOG_DEBUG, 2840 "%s: resetting MTU to %" PRIu64 " bytes\n", 2841 ifp->if_xname, ifp->if_mtu); 2842 } 2843 } 2844 2845 static void 2846 sppp_ipcp_TO(void *cookie) 2847 { 2848 sppp_to_event(&ipcp, (struct sppp *)cookie); 2849 } 2850 2851 /* 2852 * Analyze a configure request. Return true if it was agreeable, and 2853 * caused action sca, false if it has been rejected or nak'ed, and 2854 * caused action scn. (The return value is used to make the state 2855 * transition decision in the state automaton.) 2856 */ 2857 static int 2858 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2859 { 2860 u_char *buf, *r, *p; 2861 struct ifnet *ifp = &sp->pp_if; 2862 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2863 u_int32_t hisaddr, desiredaddr; 2864 2865 len -= 4; 2866 origlen = len; 2867 /* 2868 * Make sure to allocate a buf that can at least hold a 2869 * conf-nak with an `address' option. We might need it below. 2870 */ 2871 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2872 if (! buf) 2873 return (0); 2874 2875 /* pass 1: see if we can recognize them */ 2876 if (debug) 2877 log(LOG_DEBUG, "%s: ipcp parse opts:", 2878 ifp->if_xname); 2879 p = (void *)(h + 1); 2880 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2881 /* Sanity check option length */ 2882 if (p[1] > len) { 2883 /* XXX should we just RXJ? */ 2884 addlog("%s: malicious IPCP option received, dropping\n", 2885 ifp->if_xname); 2886 goto drop; 2887 } 2888 if (debug) 2889 addlog(" %s", sppp_ipcp_opt_name(*p)); 2890 switch (*p) { 2891 #ifdef notyet 2892 case IPCP_OPT_COMPRESSION: 2893 if (len >= 6 && p[1] >= 6) { 2894 /* correctly formed compress option */ 2895 continue; 2896 } 2897 if (debug) 2898 addlog(" [invalid]"); 2899 break; 2900 #endif 2901 case IPCP_OPT_ADDRESS: 2902 if (len >= 6 && p[1] == 6) { 2903 /* correctly formed address option */ 2904 continue; 2905 } 2906 if (debug) 2907 addlog(" [invalid]"); 2908 break; 2909 default: 2910 /* Others not supported. */ 2911 if (debug) 2912 addlog(" [rej]"); 2913 break; 2914 } 2915 /* Add the option to rejected list. */ 2916 bcopy (p, r, p[1]); 2917 r += p[1]; 2918 rlen += p[1]; 2919 } 2920 if (rlen) { 2921 if (debug) 2922 addlog(" send conf-rej\n"); 2923 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2924 goto end; 2925 } else if (debug) 2926 addlog("\n"); 2927 2928 /* pass 2: parse option values */ 2929 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2930 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2931 else 2932 #ifdef INET 2933 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2934 #else 2935 hisaddr = 0; 2936 #endif 2937 if (debug) 2938 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2939 ifp->if_xname); 2940 p = (void *)(h + 1); 2941 len = origlen; 2942 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2943 if (debug) 2944 addlog(" %s", sppp_ipcp_opt_name(*p)); 2945 switch (*p) { 2946 #ifdef notyet 2947 case IPCP_OPT_COMPRESSION: 2948 continue; 2949 #endif 2950 case IPCP_OPT_ADDRESS: 2951 desiredaddr = p[2] << 24 | p[3] << 16 | 2952 p[4] << 8 | p[5]; 2953 if (desiredaddr == hisaddr || 2954 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2955 /* 2956 * Peer's address is same as our value, 2957 * this is agreeable. Gonna conf-ack 2958 * it. 2959 */ 2960 if (debug) 2961 addlog(" %s [ack]", 2962 sppp_dotted_quad(hisaddr)); 2963 /* record that we've seen it already */ 2964 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2965 sp->ipcp.req_hisaddr = desiredaddr; 2966 hisaddr = desiredaddr; 2967 continue; 2968 } 2969 /* 2970 * The address wasn't agreeable. This is either 2971 * he sent us 0.0.0.0, asking to assign him an 2972 * address, or he send us another address not 2973 * matching our value. Either case, we gonna 2974 * conf-nak it with our value. 2975 */ 2976 if (debug) { 2977 if (desiredaddr == 0) 2978 addlog(" [addr requested]"); 2979 else 2980 addlog(" %s [not agreed]", 2981 sppp_dotted_quad(desiredaddr)); 2982 } 2983 2984 p[2] = hisaddr >> 24; 2985 p[3] = hisaddr >> 16; 2986 p[4] = hisaddr >> 8; 2987 p[5] = hisaddr; 2988 break; 2989 } 2990 /* Add the option to nak'ed list. */ 2991 bcopy (p, r, p[1]); 2992 r += p[1]; 2993 rlen += p[1]; 2994 } 2995 2996 /* 2997 * If we are about to conf-ack the request, but haven't seen 2998 * his address so far, gonna conf-nak it instead, with the 2999 * `address' option present and our idea of his address being 3000 * filled in there, to request negotiation of both addresses. 3001 * 3002 * XXX This can result in an endless req - nak loop if peer 3003 * doesn't want to send us his address. Q: What should we do 3004 * about it? XXX A: implement the max-failure counter. 3005 */ 3006 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 3007 buf[0] = IPCP_OPT_ADDRESS; 3008 buf[1] = 6; 3009 buf[2] = hisaddr >> 24; 3010 buf[3] = hisaddr >> 16; 3011 buf[4] = hisaddr >> 8; 3012 buf[5] = hisaddr; 3013 rlen = 6; 3014 if (debug) 3015 addlog(" still need hisaddr"); 3016 } 3017 3018 if (rlen) { 3019 if (debug) 3020 addlog(" send conf-nak\n"); 3021 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3022 } else { 3023 if (debug) 3024 addlog(" send conf-ack\n"); 3025 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3026 } 3027 3028 end: 3029 free(buf, M_TEMP); 3030 return (rlen == 0); 3031 3032 drop: 3033 free(buf, M_TEMP); 3034 return -1; 3035 } 3036 3037 /* 3038 * Analyze the IPCP Configure-Reject option list, and adjust our 3039 * negotiation. 3040 */ 3041 static void 3042 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3043 { 3044 u_char *buf, *p; 3045 struct ifnet *ifp = &sp->pp_if; 3046 int debug = ifp->if_flags & IFF_DEBUG; 3047 3048 len -= 4; 3049 buf = malloc (len, M_TEMP, M_NOWAIT); 3050 if (!buf) 3051 return; 3052 3053 if (debug) 3054 log(LOG_DEBUG, "%s: ipcp rej opts:", 3055 ifp->if_xname); 3056 3057 p = (void *)(h + 1); 3058 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3059 /* Sanity check option length */ 3060 if (p[1] > len) { 3061 /* XXX should we just RXJ? */ 3062 addlog("%s: malicious IPCP option received, dropping\n", 3063 ifp->if_xname); 3064 goto drop; 3065 } 3066 if (debug) 3067 addlog(" %s", sppp_ipcp_opt_name(*p)); 3068 switch (*p) { 3069 case IPCP_OPT_ADDRESS: 3070 /* 3071 * Peer doesn't grok address option. This is 3072 * bad. XXX Should we better give up here? 3073 */ 3074 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3075 break; 3076 #ifdef notyet 3077 case IPCP_OPT_COMPRESS: 3078 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3079 break; 3080 #endif 3081 } 3082 } 3083 if (debug) 3084 addlog("\n"); 3085 drop: 3086 free(buf, M_TEMP); 3087 return; 3088 } 3089 3090 /* 3091 * Analyze the IPCP Configure-NAK option list, and adjust our 3092 * negotiation. 3093 */ 3094 static void 3095 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3096 { 3097 u_char *p; 3098 struct ifnet *ifp = &sp->pp_if; 3099 int debug = ifp->if_flags & IFF_DEBUG; 3100 u_int32_t wantaddr; 3101 3102 len -= 4; 3103 3104 if (debug) 3105 log(LOG_DEBUG, "%s: ipcp nak opts:", 3106 ifp->if_xname); 3107 3108 p = (void *)(h + 1); 3109 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3110 /* Sanity check option length */ 3111 if (p[1] > len) { 3112 /* XXX should we just RXJ? */ 3113 addlog("%s: malicious IPCP option received, dropping\n", 3114 ifp->if_xname); 3115 return; 3116 } 3117 if (debug) 3118 addlog(" %s", sppp_ipcp_opt_name(*p)); 3119 switch (*p) { 3120 case IPCP_OPT_ADDRESS: 3121 /* 3122 * Peer doesn't like our local IP address. See 3123 * if we can do something for him. We'll drop 3124 * him our address then. 3125 */ 3126 if (len >= 6 && p[1] == 6) { 3127 wantaddr = p[2] << 24 | p[3] << 16 | 3128 p[4] << 8 | p[5]; 3129 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3130 if (debug) 3131 addlog(" [wantaddr %s]", 3132 sppp_dotted_quad(wantaddr)); 3133 /* 3134 * When doing dynamic address assignment, 3135 * we accept his offer. Otherwise, we 3136 * ignore it and thus continue to negotiate 3137 * our already existing value. 3138 */ 3139 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3140 if (debug) 3141 addlog(" [agree]"); 3142 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3143 sp->ipcp.req_myaddr = wantaddr; 3144 } 3145 } 3146 break; 3147 3148 case IPCP_OPT_PRIMDNS: 3149 if (len >= 6 && p[1] == 6) { 3150 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3151 p[4] << 8 | p[5]; 3152 } 3153 break; 3154 3155 case IPCP_OPT_SECDNS: 3156 if (len >= 6 && p[1] == 6) { 3157 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3158 p[4] << 8 | p[5]; 3159 } 3160 break; 3161 #ifdef notyet 3162 case IPCP_OPT_COMPRESS: 3163 /* 3164 * Peer wants different compression parameters. 3165 */ 3166 break; 3167 #endif 3168 } 3169 } 3170 if (debug) 3171 addlog("\n"); 3172 } 3173 3174 static void 3175 sppp_ipcp_tlu(struct sppp *sp) 3176 { 3177 #ifdef INET 3178 /* we are up. Set addresses and notify anyone interested */ 3179 STDDCL; 3180 u_int32_t myaddr, hisaddr; 3181 3182 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3183 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3184 myaddr = sp->ipcp.req_myaddr; 3185 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3186 hisaddr = sp->ipcp.req_hisaddr; 3187 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3188 3189 if (ifp->if_mtu > sp->lcp.their_mru) { 3190 sp->pp_saved_mtu = ifp->if_mtu; 3191 ifp->if_mtu = sp->lcp.their_mru; 3192 if (debug) 3193 log(LOG_DEBUG, 3194 "%s: setting MTU to %" PRIu64 " bytes\n", 3195 ifp->if_xname, ifp->if_mtu); 3196 } 3197 3198 if (sp->pp_con) 3199 sp->pp_con(sp); 3200 #endif 3201 } 3202 3203 static void 3204 sppp_ipcp_tld(struct sppp *sp) 3205 { 3206 } 3207 3208 static void 3209 sppp_ipcp_tls(struct sppp *sp) 3210 { 3211 /* indicate to LCP that it must stay alive */ 3212 sp->lcp.protos |= (1 << IDX_IPCP); 3213 } 3214 3215 static void 3216 sppp_ipcp_tlf(struct sppp *sp) 3217 { 3218 /* we no longer need LCP */ 3219 sp->lcp.protos &= ~(1 << IDX_IPCP); 3220 } 3221 3222 static void 3223 sppp_ipcp_scr(struct sppp *sp) 3224 { 3225 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3226 #ifdef INET 3227 u_int32_t ouraddr; 3228 #endif 3229 int i = 0; 3230 3231 #ifdef notyet 3232 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3233 opt[i++] = IPCP_OPT_COMPRESSION; 3234 opt[i++] = 6; 3235 opt[i++] = 0; /* VJ header compression */ 3236 opt[i++] = 0x2d; /* VJ header compression */ 3237 opt[i++] = max_slot_id; 3238 opt[i++] = comp_slot_id; 3239 } 3240 #endif 3241 3242 #ifdef INET 3243 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3244 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3245 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3246 else 3247 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3248 opt[i++] = IPCP_OPT_ADDRESS; 3249 opt[i++] = 6; 3250 opt[i++] = ouraddr >> 24; 3251 opt[i++] = ouraddr >> 16; 3252 opt[i++] = ouraddr >> 8; 3253 opt[i++] = ouraddr; 3254 } 3255 #endif 3256 3257 if (sp->query_dns & 1) { 3258 opt[i++] = IPCP_OPT_PRIMDNS; 3259 opt[i++] = 6; 3260 opt[i++] = sp->dns_addrs[0] >> 24; 3261 opt[i++] = sp->dns_addrs[0] >> 16; 3262 opt[i++] = sp->dns_addrs[0] >> 8; 3263 opt[i++] = sp->dns_addrs[0]; 3264 } 3265 if (sp->query_dns & 2) { 3266 opt[i++] = IPCP_OPT_SECDNS; 3267 opt[i++] = 6; 3268 opt[i++] = sp->dns_addrs[1] >> 24; 3269 opt[i++] = sp->dns_addrs[1] >> 16; 3270 opt[i++] = sp->dns_addrs[1] >> 8; 3271 opt[i++] = sp->dns_addrs[1]; 3272 } 3273 3274 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3275 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3276 } 3277 3278 3279 /* 3280 *--------------------------------------------------------------------------* 3281 * * 3282 * The IPv6CP implementation. * 3283 * * 3284 *--------------------------------------------------------------------------* 3285 */ 3286 3287 #ifdef INET6 3288 static void 3289 sppp_ipv6cp_init(struct sppp *sp) 3290 { 3291 sp->ipv6cp.opts = 0; 3292 sp->ipv6cp.flags = 0; 3293 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3294 sp->fail_counter[IDX_IPV6CP] = 0; 3295 sp->pp_seq[IDX_IPV6CP] = 0; 3296 sp->pp_rseq[IDX_IPV6CP] = 0; 3297 callout_init(&sp->ch[IDX_IPV6CP]); 3298 } 3299 3300 static void 3301 sppp_ipv6cp_up(struct sppp *sp) 3302 { 3303 sppp_up_event(&ipv6cp, sp); 3304 } 3305 3306 static void 3307 sppp_ipv6cp_down(struct sppp *sp) 3308 { 3309 sppp_down_event(&ipv6cp, sp); 3310 } 3311 3312 static void 3313 sppp_ipv6cp_open(struct sppp *sp) 3314 { 3315 STDDCL; 3316 struct in6_addr myaddr, hisaddr; 3317 3318 #ifdef IPV6CP_MYIFID_DYN 3319 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3320 #else 3321 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3322 #endif 3323 3324 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3325 /* 3326 * If we don't have our address, this probably means our 3327 * interface doesn't want to talk IPv6 at all. (This could 3328 * be the case if somebody wants to speak only IPX, for 3329 * example.) Don't open IPv6CP in this case. 3330 */ 3331 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3332 /* XXX this message should go away */ 3333 if (debug) 3334 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3335 ifp->if_xname); 3336 return; 3337 } 3338 3339 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3340 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3341 sppp_open_event(&ipv6cp, sp); 3342 } 3343 3344 static void 3345 sppp_ipv6cp_close(struct sppp *sp) 3346 { 3347 sppp_close_event(&ipv6cp, sp); 3348 } 3349 3350 static void 3351 sppp_ipv6cp_TO(void *cookie) 3352 { 3353 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3354 } 3355 3356 /* 3357 * Analyze a configure request. Return true if it was agreeable, and 3358 * caused action sca, false if it has been rejected or nak'ed, and 3359 * caused action scn. (The return value is used to make the state 3360 * transition decision in the state automaton.) 3361 */ 3362 static int 3363 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3364 { 3365 u_char *buf, *r, *p; 3366 struct ifnet *ifp = &sp->pp_if; 3367 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3368 struct in6_addr myaddr, desiredaddr, suggestaddr; 3369 int ifidcount; 3370 int type; 3371 int collision, nohisaddr; 3372 3373 len -= 4; 3374 origlen = len; 3375 /* 3376 * Make sure to allocate a buf that can at least hold a 3377 * conf-nak with an `address' option. We might need it below. 3378 */ 3379 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3380 if (! buf) 3381 return (0); 3382 3383 /* pass 1: see if we can recognize them */ 3384 if (debug) 3385 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3386 ifp->if_xname); 3387 p = (void *)(h + 1); 3388 ifidcount = 0; 3389 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3390 /* Sanity check option length */ 3391 if (p[1] > len) { 3392 /* XXX just RXJ? */ 3393 addlog("%s: received malicious IPCPv6 option, " 3394 "dropping\n", ifp->if_xname); 3395 goto drop; 3396 } 3397 if (debug) 3398 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3399 switch (*p) { 3400 case IPV6CP_OPT_IFID: 3401 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3402 /* correctly formed address option */ 3403 ifidcount++; 3404 continue; 3405 } 3406 if (debug) 3407 addlog(" [invalid]"); 3408 break; 3409 #ifdef notyet 3410 case IPV6CP_OPT_COMPRESSION: 3411 if (len >= 4 && p[1] >= 4) { 3412 /* correctly formed compress option */ 3413 continue; 3414 } 3415 if (debug) 3416 addlog(" [invalid]"); 3417 break; 3418 #endif 3419 default: 3420 /* Others not supported. */ 3421 if (debug) 3422 addlog(" [rej]"); 3423 break; 3424 } 3425 /* Add the option to rejected list. */ 3426 bcopy (p, r, p[1]); 3427 r += p[1]; 3428 rlen += p[1]; 3429 } 3430 if (rlen) { 3431 if (debug) 3432 addlog(" send conf-rej\n"); 3433 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3434 goto end; 3435 } else if (debug) 3436 addlog("\n"); 3437 3438 /* pass 2: parse option values */ 3439 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3440 if (debug) 3441 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3442 ifp->if_xname); 3443 p = (void *)(h + 1); 3444 len = origlen; 3445 type = CONF_ACK; 3446 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3447 if (debug) 3448 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3449 switch (*p) { 3450 #ifdef notyet 3451 case IPV6CP_OPT_COMPRESSION: 3452 continue; 3453 #endif 3454 case IPV6CP_OPT_IFID: 3455 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3456 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3457 collision = (memcmp(&desiredaddr.s6_addr[8], 3458 &myaddr.s6_addr[8], 8) == 0); 3459 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3460 3461 desiredaddr.s6_addr16[0] = htons(0xfe80); 3462 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3463 3464 if (!collision && !nohisaddr) { 3465 /* no collision, hisaddr known - Conf-Ack */ 3466 type = CONF_ACK; 3467 3468 if (debug) { 3469 addlog(" %s [%s]", 3470 ip6_sprintf(&desiredaddr), 3471 sppp_cp_type_name(type)); 3472 } 3473 continue; 3474 } 3475 3476 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3477 if (collision && nohisaddr) { 3478 /* collision, hisaddr unknown - Conf-Rej */ 3479 type = CONF_REJ; 3480 memset(&p[2], 0, 8); 3481 } else { 3482 /* 3483 * - no collision, hisaddr unknown, or 3484 * - collision, hisaddr known 3485 * Conf-Nak, suggest hisaddr 3486 */ 3487 type = CONF_NAK; 3488 sppp_suggest_ip6_addr(sp, &suggestaddr); 3489 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3490 } 3491 if (debug) 3492 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3493 sppp_cp_type_name(type)); 3494 break; 3495 } 3496 /* Add the option to nak'ed list. */ 3497 bcopy (p, r, p[1]); 3498 r += p[1]; 3499 rlen += p[1]; 3500 } 3501 3502 if (rlen == 0 && type == CONF_ACK) { 3503 if (debug) 3504 addlog(" send %s\n", sppp_cp_type_name(type)); 3505 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3506 } else { 3507 #ifdef notdef 3508 if (type == CONF_ACK) 3509 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3510 #endif 3511 3512 if (debug) { 3513 addlog(" send %s suggest %s\n", 3514 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3515 } 3516 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3517 } 3518 3519 end: 3520 free(buf, M_TEMP); 3521 return (rlen == 0); 3522 3523 drop: 3524 free(buf, M_TEMP); 3525 return -1; 3526 } 3527 3528 /* 3529 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3530 * negotiation. 3531 */ 3532 static void 3533 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3534 { 3535 u_char *buf, *p; 3536 struct ifnet *ifp = &sp->pp_if; 3537 int debug = ifp->if_flags & IFF_DEBUG; 3538 3539 len -= 4; 3540 buf = malloc (len, M_TEMP, M_NOWAIT); 3541 if (!buf) 3542 return; 3543 3544 if (debug) 3545 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3546 ifp->if_xname); 3547 3548 p = (void *)(h + 1); 3549 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3550 if (p[1] > len) { 3551 /* XXX just RXJ? */ 3552 addlog("%s: received malicious IPCPv6 option, " 3553 "dropping\n", ifp->if_xname); 3554 goto drop; 3555 } 3556 if (debug) 3557 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3558 switch (*p) { 3559 case IPV6CP_OPT_IFID: 3560 /* 3561 * Peer doesn't grok address option. This is 3562 * bad. XXX Should we better give up here? 3563 */ 3564 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3565 break; 3566 #ifdef notyet 3567 case IPV6CP_OPT_COMPRESS: 3568 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3569 break; 3570 #endif 3571 } 3572 } 3573 if (debug) 3574 addlog("\n"); 3575 drop: 3576 free(buf, M_TEMP); 3577 return; 3578 } 3579 3580 /* 3581 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3582 * negotiation. 3583 */ 3584 static void 3585 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3586 { 3587 u_char *buf, *p; 3588 struct ifnet *ifp = &sp->pp_if; 3589 int debug = ifp->if_flags & IFF_DEBUG; 3590 struct in6_addr suggestaddr; 3591 3592 len -= 4; 3593 buf = malloc (len, M_TEMP, M_NOWAIT); 3594 if (!buf) 3595 return; 3596 3597 if (debug) 3598 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3599 ifp->if_xname); 3600 3601 p = (void *)(h + 1); 3602 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3603 if (p[1] > len) { 3604 /* XXX just RXJ? */ 3605 addlog("%s: received malicious IPCPv6 option, " 3606 "dropping\n", ifp->if_xname); 3607 goto drop; 3608 } 3609 if (debug) 3610 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3611 switch (*p) { 3612 case IPV6CP_OPT_IFID: 3613 /* 3614 * Peer doesn't like our local ifid. See 3615 * if we can do something for him. We'll drop 3616 * him our address then. 3617 */ 3618 if (len < 10 || p[1] != 10) 3619 break; 3620 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3621 suggestaddr.s6_addr16[0] = htons(0xfe80); 3622 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3623 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3624 3625 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3626 if (debug) 3627 addlog(" [suggestaddr %s]", 3628 ip6_sprintf(&suggestaddr)); 3629 #ifdef IPV6CP_MYIFID_DYN 3630 /* 3631 * When doing dynamic address assignment, 3632 * we accept his offer. 3633 */ 3634 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3635 struct in6_addr lastsuggest; 3636 /* 3637 * If <suggested myaddr from peer> equals to 3638 * <hisaddr we have suggested last time>, 3639 * we have a collision. generate new random 3640 * ifid. 3641 */ 3642 sppp_suggest_ip6_addr(&lastsuggest); 3643 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3644 lastsuggest)) { 3645 if (debug) 3646 addlog(" [random]"); 3647 sppp_gen_ip6_addr(sp, &suggestaddr); 3648 } 3649 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3650 if (debug) 3651 addlog(" [agree]"); 3652 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3653 } 3654 #else 3655 /* 3656 * Since we do not do dynamic address assignment, 3657 * we ignore it and thus continue to negotiate 3658 * our already existing value. This can possibly 3659 * go into infinite request-reject loop. 3660 * 3661 * This is not likely because we normally use 3662 * ifid based on MAC-address. 3663 * If you have no ethernet card on the node, too bad. 3664 * XXX should we use fail_counter? 3665 */ 3666 #endif 3667 break; 3668 #ifdef notyet 3669 case IPV6CP_OPT_COMPRESS: 3670 /* 3671 * Peer wants different compression parameters. 3672 */ 3673 break; 3674 #endif 3675 } 3676 } 3677 if (debug) 3678 addlog("\n"); 3679 drop: 3680 free(buf, M_TEMP); 3681 return; 3682 } 3683 3684 static void 3685 sppp_ipv6cp_tlu(struct sppp *sp) 3686 { 3687 /* we are up - notify isdn daemon */ 3688 if (sp->pp_con) 3689 sp->pp_con(sp); 3690 } 3691 3692 static void 3693 sppp_ipv6cp_tld(struct sppp *sp) 3694 { 3695 } 3696 3697 static void 3698 sppp_ipv6cp_tls(struct sppp *sp) 3699 { 3700 /* indicate to LCP that it must stay alive */ 3701 sp->lcp.protos |= (1 << IDX_IPV6CP); 3702 } 3703 3704 static void 3705 sppp_ipv6cp_tlf(struct sppp *sp) 3706 { 3707 /* we no longer need LCP */ 3708 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3709 } 3710 3711 static void 3712 sppp_ipv6cp_scr(struct sppp *sp) 3713 { 3714 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3715 struct in6_addr ouraddr; 3716 int i = 0; 3717 3718 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3719 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3720 opt[i++] = IPV6CP_OPT_IFID; 3721 opt[i++] = 10; 3722 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3723 i += 8; 3724 } 3725 3726 #ifdef notyet 3727 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3728 opt[i++] = IPV6CP_OPT_COMPRESSION; 3729 opt[i++] = 4; 3730 opt[i++] = 0; /* TBD */ 3731 opt[i++] = 0; /* TBD */ 3732 /* variable length data may follow */ 3733 } 3734 #endif 3735 3736 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3737 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3738 } 3739 #else /*INET6*/ 3740 static void sppp_ipv6cp_init(struct sppp *sp) 3741 { 3742 } 3743 3744 static void sppp_ipv6cp_up(struct sppp *sp) 3745 { 3746 } 3747 3748 static void sppp_ipv6cp_down(struct sppp *sp) 3749 { 3750 } 3751 3752 3753 static void sppp_ipv6cp_open(struct sppp *sp) 3754 { 3755 } 3756 3757 static void sppp_ipv6cp_close(struct sppp *sp) 3758 { 3759 } 3760 3761 static void sppp_ipv6cp_TO(void *sp) 3762 { 3763 } 3764 3765 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3766 { 3767 return 0; 3768 } 3769 3770 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3771 { 3772 } 3773 3774 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3775 { 3776 } 3777 3778 static void sppp_ipv6cp_tlu(struct sppp *sp) 3779 { 3780 } 3781 3782 static void sppp_ipv6cp_tld(struct sppp *sp) 3783 { 3784 } 3785 3786 static void sppp_ipv6cp_tls(struct sppp *sp) 3787 { 3788 } 3789 3790 static void sppp_ipv6cp_tlf(struct sppp *sp) 3791 { 3792 } 3793 3794 static void sppp_ipv6cp_scr(struct sppp *sp) 3795 { 3796 } 3797 #endif /*INET6*/ 3798 3799 3800 /* 3801 *--------------------------------------------------------------------------* 3802 * * 3803 * The CHAP implementation. * 3804 * * 3805 *--------------------------------------------------------------------------* 3806 */ 3807 3808 /* 3809 * The authentication protocols don't employ a full-fledged state machine as 3810 * the control protocols do, since they do have Open and Close events, but 3811 * not Up and Down, nor are they explicitly terminated. Also, use of the 3812 * authentication protocols may be different in both directions (this makes 3813 * sense, think of a machine that never accepts incoming calls but only 3814 * calls out, it doesn't require the called party to authenticate itself). 3815 * 3816 * Our state machine for the local authentication protocol (we are requesting 3817 * the peer to authenticate) looks like: 3818 * 3819 * RCA- 3820 * +--------------------------------------------+ 3821 * V scn,tld| 3822 * +--------+ Close +---------+ RCA+ 3823 * | |<----------------------------------| |------+ 3824 * +--->| Closed | TO* | Opened | sca | 3825 * | | |-----+ +-------| |<-----+ 3826 * | +--------+ irc | | +---------+ 3827 * | ^ | | ^ 3828 * | | | | | 3829 * | | | | | 3830 * | TO-| | | | 3831 * | |tld TO+ V | | 3832 * | | +------->+ | | 3833 * | | | | | | 3834 * | +--------+ V | | 3835 * | | |<----+<--------------------+ | 3836 * | | Req- | scr | 3837 * | | Sent | | 3838 * | | | | 3839 * | +--------+ | 3840 * | RCA- | | RCA+ | 3841 * +------+ +------------------------------------------+ 3842 * scn,tld sca,irc,ict,tlu 3843 * 3844 * 3845 * with: 3846 * 3847 * Open: LCP reached authentication phase 3848 * Close: LCP reached terminate phase 3849 * 3850 * RCA+: received reply (pap-req, chap-response), acceptable 3851 * RCN: received reply (pap-req, chap-response), not acceptable 3852 * TO+: timeout with restart counter >= 0 3853 * TO-: timeout with restart counter < 0 3854 * TO*: reschedule timeout for CHAP 3855 * 3856 * scr: send request packet (none for PAP, chap-challenge) 3857 * sca: send ack packet (pap-ack, chap-success) 3858 * scn: send nak packet (pap-nak, chap-failure) 3859 * ict: initialize re-challenge timer (CHAP only) 3860 * 3861 * tlu: this-layer-up, LCP reaches network phase 3862 * tld: this-layer-down, LCP enters terminate phase 3863 * 3864 * Note that in CHAP mode, after sending a new challenge, while the state 3865 * automaton falls back into Req-Sent state, it doesn't signal a tld 3866 * event to LCP, so LCP remains in network phase. Only after not getting 3867 * any response (or after getting an unacceptable response), CHAP closes, 3868 * causing LCP to enter terminate phase. 3869 * 3870 * With PAP, there is no initial request that can be sent. The peer is 3871 * expected to send one based on the successful negotiation of PAP as 3872 * the authentication protocol during the LCP option negotiation. 3873 * 3874 * Incoming authentication protocol requests (remote requests 3875 * authentication, we are peer) don't employ a state machine at all, 3876 * they are simply answered. Some peers [Ascend P50 firmware rev 3877 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3878 * still in authentication phase (thereby violating the standard that 3879 * demands that these NCP packets are to be discarded), so we keep 3880 * track of the peer demanding us to authenticate, and only proceed to 3881 * phase network once we've seen a positive acknowledge for the 3882 * authentication. 3883 */ 3884 3885 /* 3886 * Handle incoming CHAP packets. 3887 */ 3888 void 3889 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3890 { 3891 STDDCL; 3892 struct lcp_header *h; 3893 int len, x; 3894 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3895 int value_len, name_len; 3896 MD5_CTX ctx; 3897 3898 len = m->m_pkthdr.len; 3899 if (len < 4) { 3900 if (debug) 3901 log(LOG_DEBUG, 3902 "%s: chap invalid packet length: %d bytes\n", 3903 ifp->if_xname, len); 3904 return; 3905 } 3906 h = mtod(m, struct lcp_header *); 3907 if (len > ntohs(h->len)) 3908 len = ntohs(h->len); 3909 3910 switch (h->type) { 3911 /* challenge, failure and success are his authproto */ 3912 case CHAP_CHALLENGE: 3913 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3914 /* can't do anything usefull */ 3915 sp->pp_auth_failures++; 3916 printf("%s: chap input without my name and my secret being set\n", 3917 ifp->if_xname); 3918 break; 3919 } 3920 value = 1 + (u_char *)(h + 1); 3921 value_len = value[-1]; 3922 name = value + value_len; 3923 name_len = len - value_len - 5; 3924 if (name_len < 0) { 3925 if (debug) { 3926 log(LOG_DEBUG, 3927 "%s: chap corrupted challenge " 3928 "<%s id=0x%x len=%d", 3929 ifp->if_xname, 3930 sppp_auth_type_name(PPP_CHAP, h->type), 3931 h->ident, ntohs(h->len)); 3932 if (len > 4) 3933 sppp_print_bytes((u_char *)(h + 1), 3934 len - 4); 3935 addlog(">\n"); 3936 } 3937 break; 3938 } 3939 3940 if (debug) { 3941 log(LOG_DEBUG, 3942 "%s: chap input <%s id=0x%x len=%d name=", 3943 ifp->if_xname, 3944 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3945 ntohs(h->len)); 3946 sppp_print_string((char *) name, name_len); 3947 addlog(" value-size=%d value=", value_len); 3948 sppp_print_bytes(value, value_len); 3949 addlog(">\n"); 3950 } 3951 3952 /* Compute reply value. */ 3953 MD5Init(&ctx); 3954 MD5Update(&ctx, &h->ident, 1); 3955 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3956 MD5Update(&ctx, value, value_len); 3957 MD5Final(digest, &ctx); 3958 dsize = sizeof digest; 3959 3960 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3961 sizeof dsize, (const char *)&dsize, 3962 sizeof digest, digest, 3963 sp->myauth.name_len, 3964 sp->myauth.name, 3965 0); 3966 break; 3967 3968 case CHAP_SUCCESS: 3969 if (debug) { 3970 log(LOG_DEBUG, "%s: chap success", 3971 ifp->if_xname); 3972 if (len > 4) { 3973 addlog(": "); 3974 sppp_print_string((char *)(h + 1), len - 4); 3975 } 3976 addlog("\n"); 3977 } 3978 x = splnet(); 3979 sp->pp_auth_failures = 0; 3980 sp->pp_flags &= ~PP_NEEDAUTH; 3981 if (sp->myauth.proto == PPP_CHAP && 3982 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3983 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3984 /* 3985 * We are authenticator for CHAP but didn't 3986 * complete yet. Leave it to tlu to proceed 3987 * to network phase. 3988 */ 3989 splx(x); 3990 break; 3991 } 3992 splx(x); 3993 sppp_phase_network(sp); 3994 break; 3995 3996 case CHAP_FAILURE: 3997 x = splnet(); 3998 sp->pp_auth_failures++; 3999 splx(x); 4000 if (debug) { 4001 log(LOG_INFO, "%s: chap failure", 4002 ifp->if_xname); 4003 if (len > 4) { 4004 addlog(": "); 4005 sppp_print_string((char *)(h + 1), len - 4); 4006 } 4007 addlog("\n"); 4008 } else 4009 log(LOG_INFO, "%s: chap failure\n", 4010 ifp->if_xname); 4011 /* await LCP shutdown by authenticator */ 4012 break; 4013 4014 /* response is my authproto */ 4015 case CHAP_RESPONSE: 4016 if (sp->hisauth.secret == NULL) { 4017 /* can't do anything usefull */ 4018 printf("%s: chap input without his secret being set\n", 4019 ifp->if_xname); 4020 break; 4021 } 4022 value = 1 + (u_char *)(h + 1); 4023 value_len = value[-1]; 4024 name = value + value_len; 4025 name_len = len - value_len - 5; 4026 if (name_len < 0) { 4027 if (debug) { 4028 log(LOG_DEBUG, 4029 "%s: chap corrupted response " 4030 "<%s id=0x%x len=%d", 4031 ifp->if_xname, 4032 sppp_auth_type_name(PPP_CHAP, h->type), 4033 h->ident, ntohs(h->len)); 4034 if (len > 4) 4035 sppp_print_bytes((u_char *)(h + 1), 4036 len - 4); 4037 addlog(">\n"); 4038 } 4039 break; 4040 } 4041 if (h->ident != sp->confid[IDX_CHAP]) { 4042 if (debug) 4043 log(LOG_DEBUG, 4044 "%s: chap dropping response for old ID " 4045 "(got %d, expected %d)\n", 4046 ifp->if_xname, 4047 h->ident, sp->confid[IDX_CHAP]); 4048 break; 4049 } 4050 if (sp->hisauth.name != NULL && 4051 (name_len != sp->hisauth.name_len 4052 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4053 log(LOG_INFO, "%s: chap response, his name ", 4054 ifp->if_xname); 4055 sppp_print_string(name, name_len); 4056 addlog(" != expected "); 4057 sppp_print_string(sp->hisauth.name, 4058 sp->hisauth.name_len); 4059 addlog("\n"); 4060 goto chap_failure; 4061 } 4062 if (debug) { 4063 log(LOG_DEBUG, "%s: chap input(%s) " 4064 "<%s id=0x%x len=%d name=", 4065 ifp->if_xname, 4066 sppp_state_name(sp->state[IDX_CHAP]), 4067 sppp_auth_type_name(PPP_CHAP, h->type), 4068 h->ident, ntohs(h->len)); 4069 sppp_print_string((char *)name, name_len); 4070 addlog(" value-size=%d value=", value_len); 4071 sppp_print_bytes(value, value_len); 4072 addlog(">\n"); 4073 } 4074 if (value_len != sizeof(sp->myauth.challenge)) { 4075 if (debug) 4076 log(LOG_DEBUG, 4077 "%s: chap bad hash value length: " 4078 "%d bytes, should be %ld\n", 4079 ifp->if_xname, value_len, 4080 (long) sizeof(sp->myauth.challenge)); 4081 goto chap_failure; 4082 } 4083 4084 MD5Init(&ctx); 4085 MD5Update(&ctx, &h->ident, 1); 4086 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4087 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4088 MD5Final(digest, &ctx); 4089 4090 #define FAILMSG "Failed..." 4091 #define SUCCMSG "Welcome!" 4092 4093 if (value_len != sizeof digest || 4094 memcmp(digest, value, value_len) != 0) { 4095 chap_failure: 4096 /* action scn, tld */ 4097 x = splnet(); 4098 sp->pp_auth_failures++; 4099 splx(x); 4100 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4101 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4102 0); 4103 chap.tld(sp); 4104 break; 4105 } 4106 sp->pp_auth_failures = 0; 4107 /* action sca, perhaps tlu */ 4108 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4109 sp->state[IDX_CHAP] == STATE_OPENED) 4110 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4111 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4112 0); 4113 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4114 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4115 chap.tlu(sp); 4116 } 4117 break; 4118 4119 default: 4120 /* Unknown CHAP packet type -- ignore. */ 4121 if (debug) { 4122 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4123 "<0x%x id=0x%xh len=%d", 4124 ifp->if_xname, 4125 sppp_state_name(sp->state[IDX_CHAP]), 4126 h->type, h->ident, ntohs(h->len)); 4127 if (len > 4) 4128 sppp_print_bytes((u_char *)(h + 1), len - 4); 4129 addlog(">\n"); 4130 } 4131 break; 4132 4133 } 4134 } 4135 4136 static void 4137 sppp_chap_init(struct sppp *sp) 4138 { 4139 /* Chap doesn't have STATE_INITIAL at all. */ 4140 sp->state[IDX_CHAP] = STATE_CLOSED; 4141 sp->fail_counter[IDX_CHAP] = 0; 4142 sp->pp_seq[IDX_CHAP] = 0; 4143 sp->pp_rseq[IDX_CHAP] = 0; 4144 callout_init(&sp->ch[IDX_CHAP]); 4145 } 4146 4147 static void 4148 sppp_chap_open(struct sppp *sp) 4149 { 4150 if (sp->myauth.proto == PPP_CHAP && 4151 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4152 /* we are authenticator for CHAP, start it */ 4153 chap.scr(sp); 4154 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4155 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4156 } 4157 /* nothing to be done if we are peer, await a challenge */ 4158 } 4159 4160 static void 4161 sppp_chap_close(struct sppp *sp) 4162 { 4163 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4164 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4165 } 4166 4167 static void 4168 sppp_chap_TO(void *cookie) 4169 { 4170 struct sppp *sp = (struct sppp *)cookie; 4171 STDDCL; 4172 int s; 4173 4174 s = splnet(); 4175 if (debug) 4176 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4177 ifp->if_xname, 4178 sppp_state_name(sp->state[IDX_CHAP]), 4179 sp->rst_counter[IDX_CHAP]); 4180 4181 if (--sp->rst_counter[IDX_CHAP] < 0) 4182 /* TO- event */ 4183 switch (sp->state[IDX_CHAP]) { 4184 case STATE_REQ_SENT: 4185 chap.tld(sp); 4186 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4187 break; 4188 } 4189 else 4190 /* TO+ (or TO*) event */ 4191 switch (sp->state[IDX_CHAP]) { 4192 case STATE_OPENED: 4193 /* TO* event */ 4194 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4195 /* fall through */ 4196 case STATE_REQ_SENT: 4197 chap.scr(sp); 4198 /* sppp_cp_change_state() will restart the timer */ 4199 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4200 break; 4201 } 4202 4203 splx(s); 4204 } 4205 4206 static void 4207 sppp_chap_tlu(struct sppp *sp) 4208 { 4209 STDDCL; 4210 int i, x; 4211 4212 i = 0; 4213 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4214 4215 /* 4216 * Some broken CHAP implementations (Conware CoNet, firmware 4217 * 4.0.?) don't want to re-authenticate their CHAP once the 4218 * initial challenge-response exchange has taken place. 4219 * Provide for an option to avoid rechallenges. 4220 */ 4221 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4222 /* 4223 * Compute the re-challenge timeout. This will yield 4224 * a number between 300 and 810 seconds. 4225 */ 4226 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4227 4228 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4229 } 4230 4231 if (debug) { 4232 log(LOG_DEBUG, 4233 "%s: chap %s, ", 4234 ifp->if_xname, 4235 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4236 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4237 addlog("next re-challenge in %d seconds\n", i); 4238 else 4239 addlog("re-challenging supressed\n"); 4240 } 4241 4242 x = splnet(); 4243 sp->pp_auth_failures = 0; 4244 /* indicate to LCP that we need to be closed down */ 4245 sp->lcp.protos |= (1 << IDX_CHAP); 4246 4247 if (sp->pp_flags & PP_NEEDAUTH) { 4248 /* 4249 * Remote is authenticator, but his auth proto didn't 4250 * complete yet. Defer the transition to network 4251 * phase. 4252 */ 4253 splx(x); 4254 return; 4255 } 4256 splx(x); 4257 4258 /* 4259 * If we are already in phase network, we are done here. This 4260 * is the case if this is a dummy tlu event after a re-challenge. 4261 */ 4262 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4263 sppp_phase_network(sp); 4264 } 4265 4266 static void 4267 sppp_chap_tld(struct sppp *sp) 4268 { 4269 STDDCL; 4270 4271 if (debug) 4272 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4273 callout_stop(&sp->ch[IDX_CHAP]); 4274 sp->lcp.protos &= ~(1 << IDX_CHAP); 4275 4276 lcp.Close(sp); 4277 } 4278 4279 static void 4280 sppp_chap_scr(struct sppp *sp) 4281 { 4282 u_int32_t *ch; 4283 u_char clen; 4284 4285 if (sp->myauth.name == NULL) { 4286 /* can't do anything usefull */ 4287 printf("%s: chap starting without my name being set\n", 4288 sp->pp_if.if_xname); 4289 return; 4290 } 4291 4292 /* Compute random challenge. */ 4293 ch = (u_int32_t *)sp->myauth.challenge; 4294 ch[0] = arc4random(); 4295 ch[1] = arc4random(); 4296 ch[2] = arc4random(); 4297 ch[3] = arc4random(); 4298 clen = 16; /* 4 * sizeof(u_int32_t) */ 4299 4300 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4301 4302 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4303 sizeof clen, (const char *)&clen, 4304 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4305 sp->myauth.name_len, 4306 sp->myauth.name, 4307 0); 4308 } 4309 4310 /* 4311 *--------------------------------------------------------------------------* 4312 * * 4313 * The PAP implementation. * 4314 * * 4315 *--------------------------------------------------------------------------* 4316 */ 4317 /* 4318 * For PAP, we need to keep a little state also if we are the peer, not the 4319 * authenticator. This is since we don't get a request to authenticate, but 4320 * have to repeatedly authenticate ourself until we got a response (or the 4321 * retry counter is expired). 4322 */ 4323 4324 /* 4325 * Handle incoming PAP packets. */ 4326 static void 4327 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4328 { 4329 STDDCL; 4330 struct lcp_header *h; 4331 int len, x; 4332 u_char mlen; 4333 char *name, *secret; 4334 int name_len, secret_len; 4335 4336 /* 4337 * Malicious input might leave this uninitialized, so 4338 * init to an impossible value. 4339 */ 4340 secret_len = -1; 4341 4342 len = m->m_pkthdr.len; 4343 if (len < 5) { 4344 if (debug) 4345 log(LOG_DEBUG, 4346 "%s: pap invalid packet length: %d bytes\n", 4347 ifp->if_xname, len); 4348 return; 4349 } 4350 h = mtod(m, struct lcp_header *); 4351 if (len > ntohs(h->len)) 4352 len = ntohs(h->len); 4353 switch (h->type) { 4354 /* PAP request is my authproto */ 4355 case PAP_REQ: 4356 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4357 /* can't do anything usefull */ 4358 printf("%s: pap request without his name and his secret being set\n", 4359 ifp->if_xname); 4360 break; 4361 } 4362 name = 1 + (u_char *)(h + 1); 4363 name_len = name[-1]; 4364 secret = name + name_len + 1; 4365 if (name_len > len - 6 || 4366 (secret_len = secret[-1]) > len - 6 - name_len) { 4367 if (debug) { 4368 log(LOG_DEBUG, "%s: pap corrupted input " 4369 "<%s id=0x%x len=%d", 4370 ifp->if_xname, 4371 sppp_auth_type_name(PPP_PAP, h->type), 4372 h->ident, ntohs(h->len)); 4373 if (len > 4) 4374 sppp_print_bytes((u_char *)(h + 1), 4375 len - 4); 4376 addlog(">\n"); 4377 } 4378 break; 4379 } 4380 if (debug) { 4381 log(LOG_DEBUG, "%s: pap input(%s) " 4382 "<%s id=0x%x len=%d name=", 4383 ifp->if_xname, 4384 sppp_state_name(sp->state[IDX_PAP]), 4385 sppp_auth_type_name(PPP_PAP, h->type), 4386 h->ident, ntohs(h->len)); 4387 sppp_print_string((char *)name, name_len); 4388 addlog(" secret="); 4389 sppp_print_string((char *)secret, secret_len); 4390 addlog(">\n"); 4391 } 4392 if (name_len != sp->hisauth.name_len || 4393 secret_len != sp->hisauth.secret_len || 4394 memcmp(name, sp->hisauth.name, name_len) != 0 || 4395 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4396 /* action scn, tld */ 4397 sp->pp_auth_failures++; 4398 mlen = sizeof(FAILMSG) - 1; 4399 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4400 sizeof mlen, (const char *)&mlen, 4401 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4402 0); 4403 pap.tld(sp); 4404 break; 4405 } 4406 /* action sca, perhaps tlu */ 4407 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4408 sp->state[IDX_PAP] == STATE_OPENED) { 4409 mlen = sizeof(SUCCMSG) - 1; 4410 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4411 sizeof mlen, (const char *)&mlen, 4412 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4413 0); 4414 } 4415 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4416 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4417 pap.tlu(sp); 4418 } 4419 break; 4420 4421 /* ack and nak are his authproto */ 4422 case PAP_ACK: 4423 callout_stop(&sp->pap_my_to_ch); 4424 if (debug) { 4425 log(LOG_DEBUG, "%s: pap success", 4426 ifp->if_xname); 4427 name = 1 + (u_char *)(h + 1); 4428 name_len = name[-1]; 4429 if (len > 5 && name_len < len+4) { 4430 addlog(": "); 4431 sppp_print_string(name, name_len); 4432 } 4433 addlog("\n"); 4434 } 4435 x = splnet(); 4436 sp->pp_auth_failures = 0; 4437 sp->pp_flags &= ~PP_NEEDAUTH; 4438 if (sp->myauth.proto == PPP_PAP && 4439 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4440 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4441 /* 4442 * We are authenticator for PAP but didn't 4443 * complete yet. Leave it to tlu to proceed 4444 * to network phase. 4445 */ 4446 splx(x); 4447 break; 4448 } 4449 splx(x); 4450 sppp_phase_network(sp); 4451 break; 4452 4453 case PAP_NAK: 4454 callout_stop(&sp->pap_my_to_ch); 4455 sp->pp_auth_failures++; 4456 if (debug) { 4457 log(LOG_INFO, "%s: pap failure", 4458 ifp->if_xname); 4459 name = 1 + (u_char *)(h + 1); 4460 name_len = name[-1]; 4461 if (len > 5 && name_len < len+4) { 4462 addlog(": "); 4463 sppp_print_string(name, name_len); 4464 } 4465 addlog("\n"); 4466 } else 4467 log(LOG_INFO, "%s: pap failure\n", 4468 ifp->if_xname); 4469 /* await LCP shutdown by authenticator */ 4470 break; 4471 4472 default: 4473 /* Unknown PAP packet type -- ignore. */ 4474 if (debug) { 4475 log(LOG_DEBUG, "%s: pap corrupted input " 4476 "<0x%x id=0x%x len=%d", 4477 ifp->if_xname, 4478 h->type, h->ident, ntohs(h->len)); 4479 if (len > 4) 4480 sppp_print_bytes((u_char *)(h + 1), len - 4); 4481 addlog(">\n"); 4482 } 4483 break; 4484 4485 } 4486 } 4487 4488 static void 4489 sppp_pap_init(struct sppp *sp) 4490 { 4491 /* PAP doesn't have STATE_INITIAL at all. */ 4492 sp->state[IDX_PAP] = STATE_CLOSED; 4493 sp->fail_counter[IDX_PAP] = 0; 4494 sp->pp_seq[IDX_PAP] = 0; 4495 sp->pp_rseq[IDX_PAP] = 0; 4496 callout_init(&sp->ch[IDX_PAP]); 4497 callout_init(&sp->pap_my_to_ch); 4498 } 4499 4500 static void 4501 sppp_pap_open(struct sppp *sp) 4502 { 4503 if (sp->hisauth.proto == PPP_PAP && 4504 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4505 /* we are authenticator for PAP, start our timer */ 4506 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4507 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4508 } 4509 if (sp->myauth.proto == PPP_PAP) { 4510 /* we are peer, send a request, and start a timer */ 4511 pap.scr(sp); 4512 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4513 sppp_pap_my_TO, sp); 4514 } 4515 } 4516 4517 static void 4518 sppp_pap_close(struct sppp *sp) 4519 { 4520 if (sp->state[IDX_PAP] != STATE_CLOSED) 4521 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4522 } 4523 4524 /* 4525 * That's the timeout routine if we are authenticator. Since the 4526 * authenticator is basically passive in PAP, we can't do much here. 4527 */ 4528 static void 4529 sppp_pap_TO(void *cookie) 4530 { 4531 struct sppp *sp = (struct sppp *)cookie; 4532 STDDCL; 4533 int s; 4534 4535 s = splnet(); 4536 if (debug) 4537 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4538 ifp->if_xname, 4539 sppp_state_name(sp->state[IDX_PAP]), 4540 sp->rst_counter[IDX_PAP]); 4541 4542 if (--sp->rst_counter[IDX_PAP] < 0) 4543 /* TO- event */ 4544 switch (sp->state[IDX_PAP]) { 4545 case STATE_REQ_SENT: 4546 pap.tld(sp); 4547 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4548 break; 4549 } 4550 else 4551 /* TO+ event, not very much we could do */ 4552 switch (sp->state[IDX_PAP]) { 4553 case STATE_REQ_SENT: 4554 /* sppp_cp_change_state() will restart the timer */ 4555 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4556 break; 4557 } 4558 4559 splx(s); 4560 } 4561 4562 /* 4563 * That's the timeout handler if we are peer. Since the peer is active, 4564 * we need to retransmit our PAP request since it is apparently lost. 4565 * XXX We should impose a max counter. 4566 */ 4567 static void 4568 sppp_pap_my_TO(void *cookie) 4569 { 4570 struct sppp *sp = (struct sppp *)cookie; 4571 STDDCL; 4572 4573 if (debug) 4574 log(LOG_DEBUG, "%s: pap peer TO\n", 4575 ifp->if_xname); 4576 4577 pap.scr(sp); 4578 } 4579 4580 static void 4581 sppp_pap_tlu(struct sppp *sp) 4582 { 4583 STDDCL; 4584 int x; 4585 4586 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4587 4588 if (debug) 4589 log(LOG_DEBUG, "%s: %s tlu\n", 4590 ifp->if_xname, pap.name); 4591 4592 x = splnet(); 4593 sp->pp_auth_failures = 0; 4594 /* indicate to LCP that we need to be closed down */ 4595 sp->lcp.protos |= (1 << IDX_PAP); 4596 4597 if (sp->pp_flags & PP_NEEDAUTH) { 4598 /* 4599 * Remote is authenticator, but his auth proto didn't 4600 * complete yet. Defer the transition to network 4601 * phase. 4602 */ 4603 splx(x); 4604 return; 4605 } 4606 splx(x); 4607 sppp_phase_network(sp); 4608 } 4609 4610 static void 4611 sppp_pap_tld(struct sppp *sp) 4612 { 4613 STDDCL; 4614 4615 if (debug) 4616 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4617 callout_stop(&sp->ch[IDX_PAP]); 4618 callout_stop(&sp->pap_my_to_ch); 4619 sp->lcp.protos &= ~(1 << IDX_PAP); 4620 4621 lcp.Close(sp); 4622 } 4623 4624 static void 4625 sppp_pap_scr(struct sppp *sp) 4626 { 4627 u_char idlen, pwdlen; 4628 4629 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4630 /* can't do anything usefull */ 4631 printf("%s: pap starting without my name and secret being set\n", 4632 sp->pp_if.if_xname); 4633 return; 4634 } 4635 4636 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4637 pwdlen = sp->myauth.secret_len; 4638 idlen = sp->myauth.name_len; 4639 4640 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4641 sizeof idlen, (const char *)&idlen, 4642 idlen, sp->myauth.name, 4643 sizeof pwdlen, (const char *)&pwdlen, 4644 pwdlen, sp->myauth.secret, 4645 0); 4646 } 4647 4648 /* 4649 * Random miscellaneous functions. 4650 */ 4651 4652 /* 4653 * Send a PAP or CHAP proto packet. 4654 * 4655 * Varadic function, each of the elements for the ellipsis is of type 4656 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4657 * mlen == 0. 4658 * NOTE: never declare variadic functions with types subject to type 4659 * promotion (i.e. u_char). This is asking for big trouble depending 4660 * on the architecture you are on... 4661 */ 4662 4663 static void 4664 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4665 unsigned int type, unsigned int id, 4666 ...) 4667 { 4668 STDDCL; 4669 struct lcp_header *lh; 4670 struct mbuf *m; 4671 u_char *p; 4672 int len; 4673 size_t pkthdrlen; 4674 unsigned int mlen; 4675 const char *msg; 4676 va_list ap; 4677 4678 MGETHDR(m, M_DONTWAIT, MT_DATA); 4679 if (! m) 4680 return; 4681 m->m_pkthdr.rcvif = 0; 4682 4683 if (sp->pp_flags & PP_NOFRAMING) { 4684 *mtod(m, u_int16_t *) = htons(cp->proto); 4685 pkthdrlen = 2; 4686 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4687 } else { 4688 struct ppp_header *h; 4689 h = mtod(m, struct ppp_header *); 4690 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4691 h->control = PPP_UI; /* Unnumbered Info */ 4692 h->protocol = htons(cp->proto); 4693 pkthdrlen = PPP_HEADER_LEN; 4694 4695 lh = (struct lcp_header *)(h + 1); 4696 } 4697 4698 lh->type = type; 4699 lh->ident = id; 4700 p = (u_char *)(lh + 1); 4701 4702 va_start(ap, id); 4703 len = 0; 4704 4705 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4706 msg = va_arg(ap, const char *); 4707 len += mlen; 4708 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4709 va_end(ap); 4710 m_freem(m); 4711 return; 4712 } 4713 4714 bcopy(msg, p, mlen); 4715 p += mlen; 4716 } 4717 va_end(ap); 4718 4719 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4720 lh->len = htons(LCP_HEADER_LEN + len); 4721 4722 if (debug) { 4723 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4724 ifp->if_xname, cp->name, 4725 sppp_auth_type_name(cp->proto, lh->type), 4726 lh->ident, ntohs(lh->len)); 4727 if (len) 4728 sppp_print_bytes((u_char *)(lh + 1), len); 4729 addlog(">\n"); 4730 } 4731 if (IF_QFULL(&sp->pp_cpq)) { 4732 IF_DROP(&sp->pp_fastq); 4733 IF_DROP(&ifp->if_snd); 4734 m_freem(m); 4735 ++ifp->if_oerrors; 4736 return; 4737 } else 4738 IF_ENQUEUE(&sp->pp_cpq, m); 4739 if (! (ifp->if_flags & IFF_OACTIVE)) 4740 (*ifp->if_start)(ifp); 4741 ifp->if_obytes += m->m_pkthdr.len + 3; 4742 } 4743 4744 /* 4745 * Send keepalive packets, every 10 seconds. 4746 */ 4747 static void 4748 sppp_keepalive(void *dummy) 4749 { 4750 struct sppp *sp; 4751 int s; 4752 time_t now; 4753 4754 s = splnet(); 4755 now = time_uptime; 4756 for (sp=spppq; sp; sp=sp->pp_next) { 4757 struct ifnet *ifp = &sp->pp_if; 4758 4759 /* check idle timeout */ 4760 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4761 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4762 /* idle timeout is enabled for this interface */ 4763 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4764 if (ifp->if_flags & IFF_DEBUG) 4765 printf("%s: no activity for %lu seconds\n", 4766 sp->pp_if.if_xname, 4767 (unsigned long)(now-sp->pp_last_activity)); 4768 lcp.Close(sp); 4769 continue; 4770 } 4771 } 4772 4773 /* Keepalive mode disabled or channel down? */ 4774 if (! (sp->pp_flags & PP_KEEPALIVE) || 4775 ! (ifp->if_flags & IFF_RUNNING)) 4776 continue; 4777 4778 /* No keepalive in PPP mode if LCP not opened yet. */ 4779 if (! (sp->pp_flags & PP_CISCO) && 4780 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4781 continue; 4782 4783 /* No echo reply, but maybe user data passed through? */ 4784 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4785 sp->pp_alivecnt = 0; 4786 continue; 4787 } 4788 4789 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4790 /* No keepalive packets got. Stop the interface. */ 4791 if_down (ifp); 4792 IF_PURGE(&sp->pp_cpq); 4793 if (! (sp->pp_flags & PP_CISCO)) { 4794 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4795 ifp->if_xname); 4796 sp->pp_alivecnt = 0; 4797 4798 /* we are down, close all open protocols */ 4799 lcp.Close(sp); 4800 4801 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4802 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4803 4804 /* Close connection imediatly, completition of this 4805 * will summon the magic needed to reestablish it. */ 4806 if (sp->pp_tlf) 4807 sp->pp_tlf(sp); 4808 continue; 4809 } 4810 } 4811 if (sp->pp_alivecnt < sp->pp_maxalive) 4812 ++sp->pp_alivecnt; 4813 if (sp->pp_flags & PP_CISCO) 4814 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4815 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4816 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4817 int32_t nmagic = htonl(sp->lcp.magic); 4818 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4819 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4820 sp->lcp.echoid, 4, &nmagic); 4821 } 4822 } 4823 splx(s); 4824 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4825 } 4826 4827 #ifdef INET 4828 /* 4829 * Get both IP addresses. 4830 */ 4831 static void 4832 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4833 { 4834 struct ifnet *ifp = &sp->pp_if; 4835 struct ifaddr *ifa; 4836 struct sockaddr_in *si, *sm; 4837 u_int32_t ssrc, ddst; 4838 4839 sm = NULL; 4840 ssrc = ddst = 0; 4841 /* 4842 * Pick the first AF_INET address from the list, 4843 * aliases don't make any sense on a p2p link anyway. 4844 */ 4845 si = 0; 4846 IFADDR_FOREACH(ifa, ifp) { 4847 if (ifa->ifa_addr->sa_family == AF_INET) { 4848 si = (struct sockaddr_in *)ifa->ifa_addr; 4849 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4850 if (si) 4851 break; 4852 } 4853 } 4854 if (ifa) { 4855 if (si && si->sin_addr.s_addr) { 4856 ssrc = si->sin_addr.s_addr; 4857 if (srcmask) 4858 *srcmask = ntohl(sm->sin_addr.s_addr); 4859 } 4860 4861 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4862 if (si && si->sin_addr.s_addr) 4863 ddst = si->sin_addr.s_addr; 4864 } 4865 4866 if (dst) *dst = ntohl(ddst); 4867 if (src) *src = ntohl(ssrc); 4868 } 4869 4870 /* 4871 * Set IP addresses. Must be called at splnet. 4872 * If an address is 0, leave it the way it is. 4873 */ 4874 static void 4875 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4876 { 4877 STDDCL; 4878 struct ifaddr *ifa; 4879 struct sockaddr_in *si, *dest; 4880 4881 /* 4882 * Pick the first AF_INET address from the list, 4883 * aliases don't make any sense on a p2p link anyway. 4884 */ 4885 4886 IFADDR_FOREACH(ifa, ifp) { 4887 if (ifa->ifa_addr->sa_family == AF_INET) { 4888 si = (struct sockaddr_in *)ifa->ifa_addr; 4889 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4890 goto found; 4891 } 4892 } 4893 return; 4894 4895 found: 4896 { 4897 int error; 4898 struct sockaddr_in new_sin = *si; 4899 struct sockaddr_in new_dst = *dest; 4900 4901 /* 4902 * Scrub old routes now instead of calling in_ifinit with 4903 * scrub=1, because we may change the dstaddr 4904 * before the call to in_ifinit. 4905 */ 4906 in_ifscrub(ifp, ifatoia(ifa)); 4907 4908 if (myaddr != 0) 4909 new_sin.sin_addr.s_addr = htonl(myaddr); 4910 if (hisaddr != 0) { 4911 new_dst.sin_addr.s_addr = htonl(hisaddr); 4912 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4913 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4914 *dest = new_dst; /* fix dstaddr in place */ 4915 } 4916 } 4917 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4918 if (debug && error) 4919 { 4920 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4921 " failed, error=%d\n", ifp->if_xname, error); 4922 } 4923 #ifdef PFIL_HOOKS 4924 if (!error) 4925 (void)pfil_run_hooks(&if_pfil, 4926 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4927 #endif 4928 } 4929 } 4930 4931 /* 4932 * Clear IP addresses. Must be called at splnet. 4933 */ 4934 static void 4935 sppp_clear_ip_addrs(struct sppp *sp) 4936 { 4937 struct ifnet *ifp = &sp->pp_if; 4938 struct ifaddr *ifa; 4939 struct sockaddr_in *si, *dest; 4940 4941 u_int32_t remote; 4942 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4943 remote = sp->ipcp.saved_hisaddr; 4944 else 4945 sppp_get_ip_addrs(sp, 0, &remote, 0); 4946 4947 /* 4948 * Pick the first AF_INET address from the list, 4949 * aliases don't make any sense on a p2p link anyway. 4950 */ 4951 4952 IFADDR_FOREACH(ifa, ifp) { 4953 if (ifa->ifa_addr->sa_family == AF_INET) { 4954 si = (struct sockaddr_in *)ifa->ifa_addr; 4955 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4956 goto found; 4957 } 4958 } 4959 return; 4960 4961 found: 4962 { 4963 struct sockaddr_in new_sin = *si; 4964 4965 in_ifscrub(ifp, ifatoia(ifa)); 4966 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4967 new_sin.sin_addr.s_addr = 0; 4968 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4969 /* replace peer addr in place */ 4970 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4971 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4972 #ifdef PFIL_HOOKS 4973 (void)pfil_run_hooks(&if_pfil, 4974 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4975 #endif 4976 } 4977 } 4978 #endif 4979 4980 #ifdef INET6 4981 /* 4982 * Get both IPv6 addresses. 4983 */ 4984 static void 4985 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4986 struct in6_addr *srcmask) 4987 { 4988 struct ifnet *ifp = &sp->pp_if; 4989 struct ifaddr *ifa; 4990 struct sockaddr_in6 *si, *sm; 4991 struct in6_addr ssrc, ddst; 4992 4993 sm = NULL; 4994 memset(&ssrc, 0, sizeof(ssrc)); 4995 memset(&ddst, 0, sizeof(ddst)); 4996 /* 4997 * Pick the first link-local AF_INET6 address from the list, 4998 * aliases don't make any sense on a p2p link anyway. 4999 */ 5000 si = 0; 5001 IFADDR_FOREACH(ifa, ifp) 5002 if (ifa->ifa_addr->sa_family == AF_INET6) { 5003 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5004 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5005 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5006 break; 5007 } 5008 if (ifa) { 5009 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5010 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 5011 if (srcmask) { 5012 bcopy(&sm->sin6_addr, srcmask, 5013 sizeof(*srcmask)); 5014 } 5015 } 5016 5017 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5018 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5019 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 5020 } 5021 5022 if (dst) 5023 bcopy(&ddst, dst, sizeof(*dst)); 5024 if (src) 5025 bcopy(&ssrc, src, sizeof(*src)); 5026 } 5027 5028 #ifdef IPV6CP_MYIFID_DYN 5029 /* 5030 * Generate random ifid. 5031 */ 5032 static void 5033 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5034 { 5035 /* TBD */ 5036 } 5037 5038 /* 5039 * Set my IPv6 address. Must be called at splnet. 5040 */ 5041 static void 5042 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5043 { 5044 STDDCL; 5045 struct ifaddr *ifa; 5046 struct sockaddr_in6 *sin6; 5047 5048 /* 5049 * Pick the first link-local AF_INET6 address from the list, 5050 * aliases don't make any sense on a p2p link anyway. 5051 */ 5052 5053 sin6 = NULL; 5054 IFADDR_FOREACH(ifa, ifp) 5055 { 5056 if (ifa->ifa_addr->sa_family == AF_INET6) 5057 { 5058 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5059 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5060 break; 5061 } 5062 } 5063 5064 if (ifa && sin6) 5065 { 5066 int error; 5067 struct sockaddr_in6 new_sin6 = *sin6; 5068 5069 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 5070 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5071 if (debug && error) 5072 { 5073 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5074 " failed, error=%d\n", ifp->if_xname, error); 5075 } 5076 #ifdef PFIL_HOOKS 5077 if (!error) 5078 (void)pfil_run_hooks(&if_pfil, 5079 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5080 #endif 5081 } 5082 } 5083 #endif 5084 5085 /* 5086 * Suggest a candidate address to be used by peer. 5087 */ 5088 static void 5089 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5090 { 5091 struct in6_addr myaddr; 5092 struct timeval tv; 5093 5094 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5095 5096 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5097 microtime(&tv); 5098 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5099 myaddr.s6_addr[14] ^= 0xff; 5100 myaddr.s6_addr[15] ^= 0xff; 5101 } else { 5102 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5103 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5104 } 5105 if (suggest) 5106 bcopy(&myaddr, suggest, sizeof(myaddr)); 5107 } 5108 #endif /*INET6*/ 5109 5110 /* 5111 * Process ioctl requests specific to the PPP interface. 5112 * Permissions have already been checked. 5113 */ 5114 static int 5115 sppp_params(struct sppp *sp, int cmd, void *data) 5116 { 5117 switch (cmd) { 5118 case SPPPGETAUTHCFG: 5119 { 5120 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5121 int error; 5122 size_t len; 5123 5124 cfg->myauthflags = sp->myauth.flags; 5125 cfg->hisauthflags = sp->hisauth.flags; 5126 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5127 cfg->hisauth = 0; 5128 if (sp->hisauth.proto) 5129 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5130 cfg->myauth = 0; 5131 if (sp->myauth.proto) 5132 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5133 if (cfg->myname_length == 0) { 5134 if (sp->myauth.name != NULL) 5135 cfg->myname_length = sp->myauth.name_len + 1; 5136 } else { 5137 if (sp->myauth.name == NULL) { 5138 cfg->myname_length = 0; 5139 } else { 5140 len = sp->myauth.name_len + 1; 5141 if (cfg->myname_length < len) 5142 return (ENAMETOOLONG); 5143 error = copyout(sp->myauth.name, cfg->myname, len); 5144 if (error) return error; 5145 } 5146 } 5147 if (cfg->hisname_length == 0) { 5148 if (sp->hisauth.name != NULL) 5149 cfg->hisname_length = sp->hisauth.name_len + 1; 5150 } else { 5151 if (sp->hisauth.name == NULL) { 5152 cfg->hisname_length = 0; 5153 } else { 5154 len = sp->hisauth.name_len + 1; 5155 if (cfg->hisname_length < len) 5156 return (ENAMETOOLONG); 5157 error = copyout(sp->hisauth.name, cfg->hisname, len); 5158 if (error) return error; 5159 } 5160 } 5161 } 5162 break; 5163 case SPPPSETAUTHCFG: 5164 { 5165 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5166 int error; 5167 5168 if (sp->myauth.name) { 5169 free(sp->myauth.name, M_DEVBUF); 5170 sp->myauth.name = NULL; 5171 } 5172 if (sp->myauth.secret) { 5173 free(sp->myauth.secret, M_DEVBUF); 5174 sp->myauth.secret = NULL; 5175 } 5176 if (sp->hisauth.name) { 5177 free(sp->hisauth.name, M_DEVBUF); 5178 sp->hisauth.name = NULL; 5179 } 5180 if (sp->hisauth.secret) { 5181 free(sp->hisauth.secret, M_DEVBUF); 5182 sp->hisauth.secret = NULL; 5183 } 5184 5185 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5186 if (cfg->hisname_length >= MCLBYTES) 5187 return (ENAMETOOLONG); 5188 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5189 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5190 if (error) { 5191 free(sp->hisauth.name, M_DEVBUF); 5192 sp->hisauth.name = NULL; 5193 return error; 5194 } 5195 sp->hisauth.name_len = cfg->hisname_length - 1; 5196 sp->hisauth.name[sp->hisauth.name_len] = 0; 5197 } 5198 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5199 if (cfg->hissecret_length >= MCLBYTES) 5200 return (ENAMETOOLONG); 5201 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5202 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5203 if (error) { 5204 free(sp->hisauth.secret, M_DEVBUF); 5205 sp->hisauth.secret = NULL; 5206 return error; 5207 } 5208 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5209 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5210 } 5211 if (cfg->myname != NULL && cfg->myname_length > 0) { 5212 if (cfg->myname_length >= MCLBYTES) 5213 return (ENAMETOOLONG); 5214 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5215 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5216 if (error) { 5217 free(sp->myauth.name, M_DEVBUF); 5218 sp->myauth.name = NULL; 5219 return error; 5220 } 5221 sp->myauth.name_len = cfg->myname_length - 1; 5222 sp->myauth.name[sp->myauth.name_len] = 0; 5223 } 5224 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5225 if (cfg->mysecret_length >= MCLBYTES) 5226 return (ENAMETOOLONG); 5227 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5228 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5229 if (error) { 5230 free(sp->myauth.secret, M_DEVBUF); 5231 sp->myauth.secret = NULL; 5232 return error; 5233 } 5234 sp->myauth.secret_len = cfg->mysecret_length - 1; 5235 sp->myauth.secret[sp->myauth.secret_len] = 0; 5236 } 5237 sp->myauth.flags = cfg->myauthflags; 5238 if (cfg->myauth) 5239 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5240 sp->hisauth.flags = cfg->hisauthflags; 5241 if (cfg->hisauth) 5242 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5243 sp->pp_auth_failures = 0; 5244 if (sp->hisauth.proto != 0) 5245 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5246 else 5247 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5248 } 5249 break; 5250 case SPPPGETLCPCFG: 5251 { 5252 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5253 lcpp->lcp_timeout = sp->lcp.timeout; 5254 } 5255 break; 5256 case SPPPSETLCPCFG: 5257 { 5258 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5259 sp->lcp.timeout = lcpp->lcp_timeout; 5260 } 5261 break; 5262 case SPPPGETSTATUS: 5263 { 5264 struct spppstatus *status = (struct spppstatus *)data; 5265 status->phase = sp->pp_phase; 5266 } 5267 break; 5268 case SPPPGETSTATUSNCP: 5269 { 5270 struct spppstatusncp *status = (struct spppstatusncp *)data; 5271 status->phase = sp->pp_phase; 5272 status->ncpup = sppp_ncp_check(sp); 5273 } 5274 break; 5275 case SPPPGETIDLETO: 5276 { 5277 struct spppidletimeout *to = (struct spppidletimeout *)data; 5278 to->idle_seconds = sp->pp_idle_timeout; 5279 } 5280 break; 5281 case SPPPSETIDLETO: 5282 { 5283 struct spppidletimeout *to = (struct spppidletimeout *)data; 5284 sp->pp_idle_timeout = to->idle_seconds; 5285 } 5286 break; 5287 case SPPPSETAUTHFAILURE: 5288 { 5289 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5290 sp->pp_max_auth_fail = afsettings->max_failures; 5291 sp->pp_auth_failures = 0; 5292 } 5293 break; 5294 case SPPPGETAUTHFAILURES: 5295 { 5296 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5297 stats->auth_failures = sp->pp_auth_failures; 5298 stats->max_failures = sp->pp_max_auth_fail; 5299 } 5300 break; 5301 case SPPPSETDNSOPTS: 5302 { 5303 struct spppdnssettings *req = (struct spppdnssettings *)data; 5304 sp->query_dns = req->query_dns & 3; 5305 } 5306 break; 5307 case SPPPGETDNSOPTS: 5308 { 5309 struct spppdnssettings *req = (struct spppdnssettings *)data; 5310 req->query_dns = sp->query_dns; 5311 } 5312 break; 5313 case SPPPGETDNSADDRS: 5314 { 5315 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5316 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5317 } 5318 break; 5319 case SPPPGETKEEPALIVE: 5320 { 5321 struct spppkeepalivesettings *settings = 5322 (struct spppkeepalivesettings*)data; 5323 settings->maxalive = sp->pp_maxalive; 5324 settings->max_noreceive = sp->pp_max_noreceive; 5325 } 5326 break; 5327 case SPPPSETKEEPALIVE: 5328 { 5329 struct spppkeepalivesettings *settings = 5330 (struct spppkeepalivesettings*)data; 5331 sp->pp_maxalive = settings->maxalive; 5332 sp->pp_max_noreceive = settings->max_noreceive; 5333 } 5334 break; 5335 default: 5336 return (EINVAL); 5337 } 5338 5339 return (0); 5340 } 5341 5342 static void 5343 sppp_phase_network(struct sppp *sp) 5344 { 5345 STDDCL; 5346 int i; 5347 u_int32_t mask; 5348 5349 sp->pp_phase = SPPP_PHASE_NETWORK; 5350 5351 if (debug) 5352 { 5353 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5354 sppp_phase_name(sp->pp_phase)); 5355 } 5356 5357 /* Notify NCPs now. */ 5358 for (i = 0; i < IDX_COUNT; i++) 5359 if ((cps[i])->flags & CP_NCP) 5360 (cps[i])->Open(sp); 5361 5362 /* Send Up events to all NCPs. */ 5363 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5364 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5365 (cps[i])->Up(sp); 5366 5367 /* if no NCP is starting, all this was in vain, close down */ 5368 sppp_lcp_check_and_close(sp); 5369 } 5370 5371 5372 static const char * 5373 sppp_cp_type_name(u_char type) 5374 { 5375 static char buf[12]; 5376 switch (type) { 5377 case CONF_REQ: return "conf-req"; 5378 case CONF_ACK: return "conf-ack"; 5379 case CONF_NAK: return "conf-nak"; 5380 case CONF_REJ: return "conf-rej"; 5381 case TERM_REQ: return "term-req"; 5382 case TERM_ACK: return "term-ack"; 5383 case CODE_REJ: return "code-rej"; 5384 case PROTO_REJ: return "proto-rej"; 5385 case ECHO_REQ: return "echo-req"; 5386 case ECHO_REPLY: return "echo-reply"; 5387 case DISC_REQ: return "discard-req"; 5388 } 5389 snprintf(buf, sizeof(buf), "0x%x", type); 5390 return buf; 5391 } 5392 5393 static const char * 5394 sppp_auth_type_name(u_short proto, u_char type) 5395 { 5396 static char buf[12]; 5397 switch (proto) { 5398 case PPP_CHAP: 5399 switch (type) { 5400 case CHAP_CHALLENGE: return "challenge"; 5401 case CHAP_RESPONSE: return "response"; 5402 case CHAP_SUCCESS: return "success"; 5403 case CHAP_FAILURE: return "failure"; 5404 } 5405 case PPP_PAP: 5406 switch (type) { 5407 case PAP_REQ: return "req"; 5408 case PAP_ACK: return "ack"; 5409 case PAP_NAK: return "nak"; 5410 } 5411 } 5412 snprintf(buf, sizeof(buf), "0x%x", type); 5413 return buf; 5414 } 5415 5416 static const char * 5417 sppp_lcp_opt_name(u_char opt) 5418 { 5419 static char buf[12]; 5420 switch (opt) { 5421 case LCP_OPT_MRU: return "mru"; 5422 case LCP_OPT_ASYNC_MAP: return "async-map"; 5423 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5424 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5425 case LCP_OPT_MAGIC: return "magic"; 5426 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5427 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5428 } 5429 snprintf(buf, sizeof(buf), "0x%x", opt); 5430 return buf; 5431 } 5432 5433 static const char * 5434 sppp_ipcp_opt_name(u_char opt) 5435 { 5436 static char buf[12]; 5437 switch (opt) { 5438 case IPCP_OPT_ADDRESSES: return "addresses"; 5439 case IPCP_OPT_COMPRESSION: return "compression"; 5440 case IPCP_OPT_ADDRESS: return "address"; 5441 } 5442 snprintf(buf, sizeof(buf), "0x%x", opt); 5443 return buf; 5444 } 5445 5446 #ifdef INET6 5447 static const char * 5448 sppp_ipv6cp_opt_name(u_char opt) 5449 { 5450 static char buf[12]; 5451 switch (opt) { 5452 case IPV6CP_OPT_IFID: return "ifid"; 5453 case IPV6CP_OPT_COMPRESSION: return "compression"; 5454 } 5455 snprintf(buf, sizeof(buf), "0x%x", opt); 5456 return buf; 5457 } 5458 #endif 5459 5460 static const char * 5461 sppp_state_name(int state) 5462 { 5463 switch (state) { 5464 case STATE_INITIAL: return "initial"; 5465 case STATE_STARTING: return "starting"; 5466 case STATE_CLOSED: return "closed"; 5467 case STATE_STOPPED: return "stopped"; 5468 case STATE_CLOSING: return "closing"; 5469 case STATE_STOPPING: return "stopping"; 5470 case STATE_REQ_SENT: return "req-sent"; 5471 case STATE_ACK_RCVD: return "ack-rcvd"; 5472 case STATE_ACK_SENT: return "ack-sent"; 5473 case STATE_OPENED: return "opened"; 5474 } 5475 return "illegal"; 5476 } 5477 5478 static const char * 5479 sppp_phase_name(int phase) 5480 { 5481 switch (phase) { 5482 case SPPP_PHASE_DEAD: return "dead"; 5483 case SPPP_PHASE_ESTABLISH: return "establish"; 5484 case SPPP_PHASE_TERMINATE: return "terminate"; 5485 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5486 case SPPP_PHASE_NETWORK: return "network"; 5487 } 5488 return "illegal"; 5489 } 5490 5491 static const char * 5492 sppp_proto_name(u_short proto) 5493 { 5494 static char buf[12]; 5495 switch (proto) { 5496 case PPP_LCP: return "lcp"; 5497 case PPP_IPCP: return "ipcp"; 5498 case PPP_PAP: return "pap"; 5499 case PPP_CHAP: return "chap"; 5500 case PPP_IPV6CP: return "ipv6cp"; 5501 } 5502 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5503 return buf; 5504 } 5505 5506 static void 5507 sppp_print_bytes(const u_char *p, u_short len) 5508 { 5509 addlog(" %02x", *p++); 5510 while (--len > 0) 5511 addlog("-%02x", *p++); 5512 } 5513 5514 static void 5515 sppp_print_string(const char *p, u_short len) 5516 { 5517 u_char c; 5518 5519 while (len-- > 0) { 5520 c = *p++; 5521 /* 5522 * Print only ASCII chars directly. RFC 1994 recommends 5523 * using only them, but we don't rely on it. */ 5524 if (c < ' ' || c > '~') 5525 addlog("\\x%x", c); 5526 else 5527 addlog("%c", c); 5528 } 5529 } 5530 5531 static const char * 5532 sppp_dotted_quad(u_int32_t addr) 5533 { 5534 static char s[16]; 5535 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5536 (int)((addr >> 24) & 0xff), 5537 (int)((addr >> 16) & 0xff), 5538 (int)((addr >> 8) & 0xff), 5539 (int)(addr & 0xff)); 5540 return s; 5541 } 5542 5543 /* a dummy, used to drop uninteresting events */ 5544 static void 5545 sppp_null(struct sppp *unused) 5546 { 5547 /* do just nothing */ 5548 } 5549 /* 5550 * This file is large. Tell emacs to highlight it nevertheless. 5551 * 5552 * Local Variables: 5553 * hilit-auto-highlight-maxout: 120000 5554 * End: 5555 */ 5556
Indexes created Sat Sep 27 22:09:54 GMT 2025