if_spppsubr.c revision 1.82.4.1
1 /* $NetBSD: if_spppsubr.c,v 1.82.4.1 2006/08/23 20:14:15 tron 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 1.82.4.1 2006/08/23 20:14:15 tron 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 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/if_types.h> 68 #include <net/route.h> 69 #include <net/ppp_defs.h> 70 71 #include <machine/stdarg.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #ifdef INET 77 #include <netinet/ip.h> 78 #include <netinet/tcp.h> 79 #endif 80 #include <net/ethertypes.h> 81 82 #ifdef IPX 83 #include <netipx/ipx.h> 84 #include <netipx/ipx_if.h> 85 #endif 86 87 #ifdef NS 88 #include <netns/ns.h> 89 #include <netns/ns_if.h> 90 #endif 91 92 #ifdef ISO 93 #include <netiso/argo_debug.h> 94 #include <netiso/iso.h> 95 #include <netiso/iso_var.h> 96 #include <netiso/iso_snpac.h> 97 #endif 98 99 #include <net/if_sppp.h> 100 #include <net/if_spppvar.h> 101 102 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 103 #define LOOPALIVECNT 3 /* loopback detection tries */ 104 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 105 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 106 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define CONF_REQ 1 /* PPP configure request */ 133 #define CONF_ACK 2 /* PPP configure acknowledge */ 134 #define CONF_NAK 3 /* PPP configure negative ack */ 135 #define CONF_REJ 4 /* PPP configure reject */ 136 #define TERM_REQ 5 /* PPP terminate request */ 137 #define TERM_ACK 6 /* PPP terminate acknowledge */ 138 #define CODE_REJ 7 /* PPP code reject */ 139 #define PROTO_REJ 8 /* PPP protocol reject */ 140 #define ECHO_REQ 9 /* PPP echo request */ 141 #define ECHO_REPLY 10 /* PPP echo reply */ 142 #define DISC_REQ 11 /* PPP discard request */ 143 144 #define LCP_OPT_MRU 1 /* maximum receive unit */ 145 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 146 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 147 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 148 #define LCP_OPT_MAGIC 5 /* magic number */ 149 #define LCP_OPT_RESERVED 6 /* reserved */ 150 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 151 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 152 153 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 154 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 155 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 156 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 157 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 158 159 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 160 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 161 162 #define PAP_REQ 1 /* PAP name/password request */ 163 #define PAP_ACK 2 /* PAP acknowledge */ 164 #define PAP_NAK 3 /* PAP fail */ 165 166 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 167 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 168 #define CHAP_SUCCESS 3 /* CHAP response ok */ 169 #define CHAP_FAILURE 4 /* CHAP response failed */ 170 171 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 172 173 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 174 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 175 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 176 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 177 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 178 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 179 180 /* states are named and numbered according to RFC 1661 */ 181 #define STATE_INITIAL 0 182 #define STATE_STARTING 1 183 #define STATE_CLOSED 2 184 #define STATE_STOPPED 3 185 #define STATE_CLOSING 4 186 #define STATE_STOPPING 5 187 #define STATE_REQ_SENT 6 188 #define STATE_ACK_RCVD 7 189 #define STATE_ACK_SENT 8 190 #define STATE_OPENED 9 191 192 struct ppp_header { 193 u_int8_t address; 194 u_int8_t control; 195 u_int16_t protocol; 196 } __attribute__((__packed__)); 197 #define PPP_HEADER_LEN sizeof (struct ppp_header) 198 199 struct lcp_header { 200 u_int8_t type; 201 u_int8_t ident; 202 u_int16_t len; 203 } __attribute__((__packed__)); 204 #define LCP_HEADER_LEN sizeof (struct lcp_header) 205 206 struct cisco_packet { 207 u_int32_t type; 208 u_int32_t par1; 209 u_int32_t par2; 210 u_int16_t rel; 211 u_int16_t time0; 212 u_int16_t time1; 213 } __attribute__((__packed__)); 214 #define CISCO_PACKET_LEN 18 215 216 /* 217 * We follow the spelling and capitalization of RFC 1661 here, to make 218 * it easier comparing with the standard. Please refer to this RFC in 219 * case you can't make sense out of these abbreviation; it will also 220 * explain the semantics related to the various events and actions. 221 */ 222 struct cp { 223 u_short proto; /* PPP control protocol number */ 224 u_char protoidx; /* index into state table in struct sppp */ 225 u_char flags; 226 #define CP_LCP 0x01 /* this is the LCP */ 227 #define CP_AUTH 0x02 /* this is an authentication protocol */ 228 #define CP_NCP 0x04 /* this is a NCP */ 229 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 230 const char *name; /* name of this control protocol */ 231 /* event handlers */ 232 void (*Up)(struct sppp *sp); 233 void (*Down)(struct sppp *sp); 234 void (*Open)(struct sppp *sp); 235 void (*Close)(struct sppp *sp); 236 void (*TO)(void *sp); 237 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 239 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 240 /* actions */ 241 void (*tlu)(struct sppp *sp); 242 void (*tld)(struct sppp *sp); 243 void (*tls)(struct sppp *sp); 244 void (*tlf)(struct sppp *sp); 245 void (*scr)(struct sppp *sp); 246 }; 247 248 static struct sppp *spppq; 249 static struct callout keepalive_ch; 250 251 #ifdef INET 252 /* 253 * The following disgusting hack gets around the problem that IP TOS 254 * can't be set yet. We want to put "interactive" traffic on a high 255 * priority queue. To decide if traffic is interactive, we check that 256 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 257 * 258 * XXX is this really still necessary? - joerg - 259 */ 260 static u_short interactive_ports[8] = { 261 0, 513, 0, 0, 262 0, 21, 0, 23, 263 }; 264 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 265 #endif 266 267 /* almost every function needs these */ 268 #define STDDCL \ 269 struct ifnet *ifp = &sp->pp_if; \ 270 int debug = ifp->if_flags & IFF_DEBUG 271 272 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 273 struct sockaddr *dst, struct rtentry *rt); 274 275 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 276 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 277 278 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 279 struct mbuf *m); 280 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 281 u_char ident, u_short len, void *data); 282 /* static void sppp_cp_timeout(void *arg); */ 283 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 284 int newstate); 285 static void sppp_auth_send(const struct cp *cp, 286 struct sppp *sp, unsigned int type, unsigned int id, 287 ...); 288 289 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 293 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 294 295 static void sppp_null(struct sppp *sp); 296 297 static void sppp_lcp_init(struct sppp *sp); 298 static void sppp_lcp_up(struct sppp *sp); 299 static void sppp_lcp_down(struct sppp *sp); 300 static void sppp_lcp_open(struct sppp *sp); 301 static void sppp_lcp_close(struct sppp *sp); 302 static void sppp_lcp_TO(void *sp); 303 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 306 static void sppp_lcp_tlu(struct sppp *sp); 307 static void sppp_lcp_tld(struct sppp *sp); 308 static void sppp_lcp_tls(struct sppp *sp); 309 static void sppp_lcp_tlf(struct sppp *sp); 310 static void sppp_lcp_scr(struct sppp *sp); 311 static void sppp_lcp_check_and_close(struct sppp *sp); 312 static int sppp_ncp_check(struct sppp *sp); 313 314 static void sppp_ipcp_init(struct sppp *sp); 315 static void sppp_ipcp_up(struct sppp *sp); 316 static void sppp_ipcp_down(struct sppp *sp); 317 static void sppp_ipcp_open(struct sppp *sp); 318 static void sppp_ipcp_close(struct sppp *sp); 319 static void sppp_ipcp_TO(void *sp); 320 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipcp_tlu(struct sppp *sp); 324 static void sppp_ipcp_tld(struct sppp *sp); 325 static void sppp_ipcp_tls(struct sppp *sp); 326 static void sppp_ipcp_tlf(struct sppp *sp); 327 static void sppp_ipcp_scr(struct sppp *sp); 328 329 static void sppp_ipv6cp_init(struct sppp *sp); 330 static void sppp_ipv6cp_up(struct sppp *sp); 331 static void sppp_ipv6cp_down(struct sppp *sp); 332 static void sppp_ipv6cp_open(struct sppp *sp); 333 static void sppp_ipv6cp_close(struct sppp *sp); 334 static void sppp_ipv6cp_TO(void *sp); 335 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 338 static void sppp_ipv6cp_tlu(struct sppp *sp); 339 static void sppp_ipv6cp_tld(struct sppp *sp); 340 static void sppp_ipv6cp_tls(struct sppp *sp); 341 static void sppp_ipv6cp_tlf(struct sppp *sp); 342 static void sppp_ipv6cp_scr(struct sppp *sp); 343 344 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_pap_init(struct sppp *sp); 346 static void sppp_pap_open(struct sppp *sp); 347 static void sppp_pap_close(struct sppp *sp); 348 static void sppp_pap_TO(void *sp); 349 static void sppp_pap_my_TO(void *sp); 350 static void sppp_pap_tlu(struct sppp *sp); 351 static void sppp_pap_tld(struct sppp *sp); 352 static void sppp_pap_scr(struct sppp *sp); 353 354 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 355 static void sppp_chap_init(struct sppp *sp); 356 static void sppp_chap_open(struct sppp *sp); 357 static void sppp_chap_close(struct sppp *sp); 358 static void sppp_chap_TO(void *sp); 359 static void sppp_chap_tlu(struct sppp *sp); 360 static void sppp_chap_tld(struct sppp *sp); 361 static void sppp_chap_scr(struct sppp *sp); 362 363 static const char *sppp_auth_type_name(u_short proto, u_char type); 364 static const char *sppp_cp_type_name(u_char type); 365 static const char *sppp_dotted_quad(u_int32_t addr); 366 static const char *sppp_ipcp_opt_name(u_char opt); 367 #ifdef INET6 368 static const char *sppp_ipv6cp_opt_name(u_char opt); 369 #endif 370 static const char *sppp_lcp_opt_name(u_char opt); 371 static const char *sppp_phase_name(int phase); 372 static const char *sppp_proto_name(u_short proto); 373 static const char *sppp_state_name(int state); 374 static int sppp_params(struct sppp *sp, int cmd, void *data); 375 #ifdef INET 376 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 377 u_int32_t *srcmask); 378 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #endif 381 static void sppp_keepalive(void *dummy); 382 static void sppp_phase_network(struct sppp *sp); 383 static void sppp_print_bytes(const u_char *p, u_short len); 384 static void sppp_print_string(const char *p, u_short len); 385 #ifdef INET6 386 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 387 struct in6_addr *dst, struct in6_addr *srcmask); 388 #ifdef IPV6CP_MYIFID_DYN 389 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 390 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 391 #endif 392 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 393 #endif 394 395 /* our control protocol descriptors */ 396 static const struct cp lcp = { 397 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 398 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 399 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 400 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 401 sppp_lcp_scr 402 }; 403 404 static const struct cp ipcp = { 405 PPP_IPCP, IDX_IPCP, 406 #ifdef INET 407 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 408 #else 409 0, 410 #endif 411 "ipcp", 412 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 413 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 414 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 415 sppp_ipcp_scr 416 }; 417 418 static const struct cp ipv6cp = { 419 PPP_IPV6CP, IDX_IPV6CP, 420 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 421 CP_NCP, 422 #else 423 0, 424 #endif 425 "ipv6cp", 426 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 427 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 428 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 429 sppp_ipv6cp_scr 430 }; 431 432 static const struct cp pap = { 433 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 434 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 435 sppp_pap_TO, 0, 0, 0, 436 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 437 sppp_pap_scr 438 }; 439 440 static const struct cp chap = { 441 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 442 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 443 sppp_chap_TO, 0, 0, 0, 444 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 445 sppp_chap_scr 446 }; 447 448 static const struct cp *cps[IDX_COUNT] = { 449 &lcp, /* IDX_LCP */ 450 &ipcp, /* IDX_IPCP */ 451 &ipv6cp, /* IDX_IPV6CP */ 452 &pap, /* IDX_PAP */ 453 &chap, /* IDX_CHAP */ 454 }; 455 456 457 /* 458 * Exported functions, comprising our interface to the lower layer. 459 */ 460 461 /* 462 * Process the received packet. 463 */ 464 void 465 sppp_input(struct ifnet *ifp, struct mbuf *m) 466 { 467 struct ppp_header *h = NULL; 468 struct ifqueue *inq = 0; 469 u_int16_t protocol; 470 int s; 471 struct sppp *sp = (struct sppp *)ifp; 472 int debug = ifp->if_flags & IFF_DEBUG; 473 474 if (ifp->if_flags & IFF_UP) { 475 /* Count received bytes, add hardware framing */ 476 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 477 /* Note time of last receive */ 478 sp->pp_last_receive = mono_time.tv_sec; 479 } 480 481 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 482 /* Too small packet, drop it. */ 483 if (debug) 484 log(LOG_DEBUG, 485 "%s: input packet is too small, %d bytes\n", 486 ifp->if_xname, m->m_pkthdr.len); 487 drop: 488 ++ifp->if_ierrors; 489 ++ifp->if_iqdrops; 490 m_freem(m); 491 return; 492 } 493 494 if (sp->pp_flags & PP_NOFRAMING) { 495 memcpy(&protocol, mtod(m, void *), 2); 496 protocol = ntohs(protocol); 497 m_adj(m, 2); 498 } else { 499 500 /* Get PPP header. */ 501 h = mtod(m, struct ppp_header *); 502 m_adj(m, PPP_HEADER_LEN); 503 504 switch (h->address) { 505 case PPP_ALLSTATIONS: 506 if (h->control != PPP_UI) 507 goto invalid; 508 if (sp->pp_flags & PP_CISCO) { 509 if (debug) 510 log(LOG_DEBUG, 511 "%s: PPP packet in Cisco mode " 512 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 513 ifp->if_xname, 514 h->address, h->control, ntohs(h->protocol)); 515 goto drop; 516 } 517 break; 518 case CISCO_MULTICAST: 519 case CISCO_UNICAST: 520 /* Don't check the control field here (RFC 1547). */ 521 if (! (sp->pp_flags & PP_CISCO)) { 522 if (debug) 523 log(LOG_DEBUG, 524 "%s: Cisco packet in PPP mode " 525 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 526 ifp->if_xname, 527 h->address, h->control, ntohs(h->protocol)); 528 goto drop; 529 } 530 switch (ntohs(h->protocol)) { 531 default: 532 ++ifp->if_noproto; 533 goto invalid; 534 case CISCO_KEEPALIVE: 535 sppp_cisco_input((struct sppp *) ifp, m); 536 m_freem(m); 537 return; 538 #ifdef INET 539 case ETHERTYPE_IP: 540 schednetisr(NETISR_IP); 541 inq = &ipintrq; 542 break; 543 #endif 544 #ifdef INET6 545 case ETHERTYPE_IPV6: 546 schednetisr(NETISR_IPV6); 547 inq = &ip6intrq; 548 break; 549 #endif 550 #ifdef IPX 551 case ETHERTYPE_IPX: 552 schednetisr(NETISR_IPX); 553 inq = &ipxintrq; 554 break; 555 #endif 556 #ifdef NS 557 case ETHERTYPE_NS: 558 schednetisr(NETISR_NS); 559 inq = &nsintrq; 560 break; 561 #endif 562 } 563 goto queue_pkt; 564 default: /* Invalid PPP packet. */ 565 invalid: 566 if (debug) 567 log(LOG_DEBUG, 568 "%s: invalid input packet " 569 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 570 ifp->if_xname, 571 h->address, h->control, ntohs(h->protocol)); 572 goto drop; 573 } 574 protocol = ntohs(h->protocol); 575 } 576 577 switch (protocol) { 578 default: 579 if (sp->state[IDX_LCP] == STATE_OPENED) { 580 u_int16_t prot = htons(protocol); 581 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 582 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 583 &prot); 584 } 585 if (debug) 586 log(LOG_DEBUG, 587 "%s: invalid input protocol " 588 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 589 ++ifp->if_noproto; 590 goto drop; 591 case PPP_LCP: 592 sppp_cp_input(&lcp, sp, m); 593 m_freem(m); 594 return; 595 case PPP_PAP: 596 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 597 sppp_pap_input(sp, m); 598 m_freem(m); 599 return; 600 case PPP_CHAP: 601 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 602 sppp_chap_input(sp, m); 603 m_freem(m); 604 return; 605 #ifdef INET 606 case PPP_IPCP: 607 if (sp->pp_phase == SPPP_PHASE_NETWORK) 608 sppp_cp_input(&ipcp, sp, m); 609 m_freem(m); 610 return; 611 case PPP_IP: 612 if (sp->state[IDX_IPCP] == STATE_OPENED) { 613 schednetisr(NETISR_IP); 614 inq = &ipintrq; 615 sp->pp_last_activity = mono_time.tv_sec; 616 } 617 break; 618 #endif 619 #ifdef INET6 620 case PPP_IPV6CP: 621 if (sp->pp_phase == SPPP_PHASE_NETWORK) 622 sppp_cp_input(&ipv6cp, sp, m); 623 m_freem(m); 624 return; 625 626 case PPP_IPV6: 627 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 628 schednetisr(NETISR_IPV6); 629 inq = &ip6intrq; 630 sp->pp_last_activity = mono_time.tv_sec; 631 } 632 break; 633 #endif 634 #ifdef IPX 635 case PPP_IPX: 636 /* IPX IPXCP not implemented yet */ 637 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 638 schednetisr(NETISR_IPX); 639 inq = &ipxintrq; 640 } 641 break; 642 #endif 643 #ifdef NS 644 case PPP_XNS: 645 /* XNS IDPCP not implemented yet */ 646 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 647 schednetisr(NETISR_NS); 648 inq = &nsintrq; 649 } 650 break; 651 #endif 652 #ifdef ISO 653 case PPP_ISO: 654 /* OSI NLCP not implemented yet */ 655 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 656 schednetisr(NETISR_ISO); 657 inq = &clnlintrq; 658 } 659 break; 660 #endif 661 } 662 663 queue_pkt: 664 if (! (ifp->if_flags & IFF_UP) || ! inq) 665 goto drop; 666 667 /* Check queue. */ 668 s = splnet(); 669 if (IF_QFULL(inq)) { 670 /* Queue overflow. */ 671 IF_DROP(inq); 672 splx(s); 673 if (debug) 674 log(LOG_DEBUG, "%s: protocol queue overflow\n", 675 ifp->if_xname); 676 goto drop; 677 } 678 IF_ENQUEUE(inq, m); 679 splx(s); 680 } 681 682 /* 683 * Enqueue transmit packet. 684 */ 685 static int 686 sppp_output(struct ifnet *ifp, struct mbuf *m, 687 struct sockaddr *dst, struct rtentry *rt) 688 { 689 struct sppp *sp = (struct sppp *) ifp; 690 struct ppp_header *h = NULL; 691 struct ifqueue *ifq = NULL; /* XXX */ 692 int s, len, rv = 0; 693 u_int16_t protocol; 694 ALTQ_DECL(struct altq_pktattr pktattr;) 695 696 s = splnet(); 697 698 sp->pp_last_activity = mono_time.tv_sec; 699 700 if ((ifp->if_flags & IFF_UP) == 0 || 701 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 702 m_freem(m); 703 splx(s); 704 return (ENETDOWN); 705 } 706 707 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 708 /* 709 * Interface is not yet running, but auto-dial. Need 710 * to start LCP for it. 711 */ 712 ifp->if_flags |= IFF_RUNNING; 713 splx(s); 714 lcp.Open(sp); 715 s = splnet(); 716 } 717 718 /* 719 * If the queueing discipline needs packet classification, 720 * do it before prepending link headers. 721 */ 722 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 723 724 #ifdef INET 725 if (dst->sa_family == AF_INET) { 726 struct ip *ip = NULL; 727 struct tcphdr *th = NULL; 728 729 if (m->m_len >= sizeof(struct ip)) { 730 ip = mtod(m, struct ip *); 731 if (ip->ip_p == IPPROTO_TCP && 732 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 733 sizeof(struct tcphdr)) { 734 th = (struct tcphdr *) 735 ((caddr_t)ip + (ip->ip_hl << 2)); 736 } 737 } else 738 ip = NULL; 739 740 /* 741 * When using dynamic local IP address assignment by using 742 * 0.0.0.0 as a local address, the first TCP session will 743 * not connect because the local TCP checksum is computed 744 * using 0.0.0.0 which will later become our real IP address 745 * so the TCP checksum computed at the remote end will 746 * become invalid. So we 747 * - don't let packets with src ip addr 0 thru 748 * - we flag TCP packets with src ip 0 as an error 749 */ 750 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 751 u_int8_t proto = ip->ip_p; 752 753 m_freem(m); 754 splx(s); 755 if (proto == IPPROTO_TCP) 756 return (EADDRNOTAVAIL); 757 else 758 return (0); 759 } 760 761 /* 762 * Put low delay, telnet, rlogin and ftp control packets 763 * in front of the queue. 764 */ 765 766 if (!IF_QFULL(&sp->pp_fastq) && 767 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 768 (th && (INTERACTIVE(ntohs(th->th_sport)) || 769 INTERACTIVE(ntohs(th->th_dport)))))) 770 ifq = &sp->pp_fastq; 771 } 772 #endif 773 774 #ifdef INET6 775 if (dst->sa_family == AF_INET6) { 776 /* XXX do something tricky here? */ 777 } 778 #endif 779 780 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 781 /* 782 * Prepend general data packet PPP header. For now, IP only. 783 */ 784 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 785 if (! m) { 786 if (ifp->if_flags & IFF_DEBUG) 787 log(LOG_DEBUG, "%s: no memory for transmit header\n", 788 ifp->if_xname); 789 ++ifp->if_oerrors; 790 splx(s); 791 return (ENOBUFS); 792 } 793 /* 794 * May want to check size of packet 795 * (albeit due to the implementation it's always enough) 796 */ 797 h = mtod(m, struct ppp_header *); 798 if (sp->pp_flags & PP_CISCO) { 799 h->address = CISCO_UNICAST; /* unicast address */ 800 h->control = 0; 801 } else { 802 h->address = PPP_ALLSTATIONS; /* broadcast address */ 803 h->control = PPP_UI; /* Unnumbered Info */ 804 } 805 } 806 807 switch (dst->sa_family) { 808 #ifdef INET 809 case AF_INET: /* Internet Protocol */ 810 if (sp->pp_flags & PP_CISCO) 811 protocol = htons(ETHERTYPE_IP); 812 else { 813 /* 814 * Don't choke with an ENETDOWN early. It's 815 * possible that we just started dialing out, 816 * so don't drop the packet immediately. If 817 * we notice that we run out of buffer space 818 * below, we will however remember that we are 819 * not ready to carry IP packets, and return 820 * ENETDOWN, as opposed to ENOBUFS. 821 */ 822 protocol = htons(PPP_IP); 823 if (sp->state[IDX_IPCP] != STATE_OPENED) 824 rv = ENETDOWN; 825 } 826 break; 827 #endif 828 #ifdef INET6 829 case AF_INET6: /* Internet Protocol version 6 */ 830 if (sp->pp_flags & PP_CISCO) 831 protocol = htons(ETHERTYPE_IPV6); 832 else { 833 /* 834 * Don't choke with an ENETDOWN early. It's 835 * possible that we just started dialing out, 836 * so don't drop the packet immediately. If 837 * we notice that we run out of buffer space 838 * below, we will however remember that we are 839 * not ready to carry IP packets, and return 840 * ENETDOWN, as opposed to ENOBUFS. 841 */ 842 protocol = htons(PPP_IPV6); 843 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 844 rv = ENETDOWN; 845 } 846 break; 847 #endif 848 #ifdef NS 849 case AF_NS: /* Xerox NS Protocol */ 850 protocol = htons((sp->pp_flags & PP_CISCO) ? 851 ETHERTYPE_NS : PPP_XNS); 852 break; 853 #endif 854 #ifdef IPX 855 case AF_IPX: /* Novell IPX Protocol */ 856 protocol = htons((sp->pp_flags & PP_CISCO) ? 857 ETHERTYPE_IPX : PPP_IPX); 858 break; 859 #endif 860 #ifdef ISO 861 case AF_ISO: /* ISO OSI Protocol */ 862 if (sp->pp_flags & PP_CISCO) 863 goto nosupport; 864 protocol = htons(PPP_ISO); 865 break; 866 nosupport: 867 #endif 868 default: 869 m_freem(m); 870 ++ifp->if_oerrors; 871 splx(s); 872 return (EAFNOSUPPORT); 873 } 874 875 if (sp->pp_flags & PP_NOFRAMING) { 876 M_PREPEND(m, 2, M_DONTWAIT); 877 if (m == NULL) { 878 if (ifp->if_flags & IFF_DEBUG) 879 log(LOG_DEBUG, "%s: no memory for transmit header\n", 880 ifp->if_xname); 881 ++ifp->if_oerrors; 882 splx(s); 883 return (ENOBUFS); 884 } 885 *mtod(m, u_int16_t *) = protocol; 886 } else { 887 h->protocol = protocol; 888 } 889 890 /* 891 * Queue message on interface, and start output if interface 892 * not yet active. 893 */ 894 len = m->m_pkthdr.len; 895 if (ifq != NULL 896 #ifdef ALTQ 897 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 898 #endif 899 ) { 900 if (IF_QFULL(ifq)) { 901 IF_DROP(&ifp->if_snd); 902 m_freem(m); 903 if (rv == 0) 904 rv = ENOBUFS; 905 } 906 else 907 IF_ENQUEUE(ifq, m); 908 } else 909 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 910 if (rv != 0) { 911 ++ifp->if_oerrors; 912 splx(s); 913 return (rv); 914 } 915 916 if (! (ifp->if_flags & IFF_OACTIVE)) 917 (*ifp->if_start)(ifp); 918 919 /* 920 * Count output packets and bytes. 921 * The packet length includes header + additional hardware framing 922 * according to RFC 1333. 923 */ 924 ifp->if_obytes += len + sp->pp_framebytes; 925 splx(s); 926 return (0); 927 } 928 929 void 930 sppp_attach(struct ifnet *ifp) 931 { 932 struct sppp *sp = (struct sppp *) ifp; 933 934 /* Initialize keepalive handler. */ 935 if (! spppq) { 936 callout_init(&keepalive_ch); 937 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 938 } 939 940 /* Insert new entry into the keepalive list. */ 941 sp->pp_next = spppq; 942 spppq = sp; 943 944 sp->pp_if.if_type = IFT_PPP; 945 sp->pp_if.if_output = sppp_output; 946 sp->pp_fastq.ifq_maxlen = 32; 947 sp->pp_cpq.ifq_maxlen = 20; 948 sp->pp_loopcnt = 0; 949 sp->pp_alivecnt = 0; 950 sp->pp_last_activity = 0; 951 sp->pp_last_receive = 0; 952 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 953 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 954 sp->pp_idle_timeout = 0; 955 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 956 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 957 sp->pp_auth_failures = 0; 958 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 959 sp->pp_phase = SPPP_PHASE_DEAD; 960 sp->pp_up = lcp.Up; 961 sp->pp_down = lcp.Down; 962 963 if_alloc_sadl(ifp); 964 965 memset(&sp->myauth, 0, sizeof sp->myauth); 966 memset(&sp->hisauth, 0, sizeof sp->hisauth); 967 sppp_lcp_init(sp); 968 sppp_ipcp_init(sp); 969 sppp_ipv6cp_init(sp); 970 sppp_pap_init(sp); 971 sppp_chap_init(sp); 972 } 973 974 void 975 sppp_detach(struct ifnet *ifp) 976 { 977 struct sppp **q, *p, *sp = (struct sppp *) ifp; 978 int i; 979 980 /* Remove the entry from the keepalive list. */ 981 for (q = &spppq; (p = *q); q = &p->pp_next) 982 if (p == sp) { 983 *q = p->pp_next; 984 break; 985 } 986 987 /* Stop keepalive handler. */ 988 if (! spppq) { 989 callout_stop(&keepalive_ch); 990 } 991 992 for (i = 0; i < IDX_COUNT; i++) { 993 callout_stop(&sp->ch[i]); 994 } 995 callout_stop(&sp->pap_my_to_ch); 996 997 /* free authentication info */ 998 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 999 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 1000 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 1001 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 1002 1003 #if 0 /* done in if_detach() */ 1004 if_free_sadl(ifp); 1005 #endif 1006 } 1007 1008 /* 1009 * Flush the interface output queue. 1010 */ 1011 void 1012 sppp_flush(struct ifnet *ifp) 1013 { 1014 struct sppp *sp = (struct sppp *) ifp; 1015 1016 IFQ_PURGE(&sp->pp_if.if_snd); 1017 IF_PURGE(&sp->pp_fastq); 1018 IF_PURGE(&sp->pp_cpq); 1019 } 1020 1021 /* 1022 * Check if the output queue is empty. 1023 */ 1024 int 1025 sppp_isempty(struct ifnet *ifp) 1026 { 1027 struct sppp *sp = (struct sppp *) ifp; 1028 int empty, s; 1029 1030 s = splnet(); 1031 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1032 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1033 splx(s); 1034 return (empty); 1035 } 1036 1037 /* 1038 * Get next packet to send. 1039 */ 1040 struct mbuf * 1041 sppp_dequeue(struct ifnet *ifp) 1042 { 1043 struct sppp *sp = (struct sppp *) ifp; 1044 struct mbuf *m; 1045 int s; 1046 1047 s = splnet(); 1048 /* 1049 * Process only the control protocol queue until we have at 1050 * least one NCP open. 1051 * 1052 * Do always serve all three queues in Cisco mode. 1053 */ 1054 IF_DEQUEUE(&sp->pp_cpq, m); 1055 if (m == NULL && 1056 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1057 IF_DEQUEUE(&sp->pp_fastq, m); 1058 if (m == NULL) 1059 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1060 } 1061 splx(s); 1062 return m; 1063 } 1064 1065 /* 1066 * Process an ioctl request. Called on low priority level. 1067 */ 1068 int 1069 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1070 { 1071 struct ifreq *ifr = (struct ifreq *) data; 1072 struct sppp *sp = (struct sppp *) ifp; 1073 int s, error=0, going_up, going_down, newmode; 1074 1075 s = splnet(); 1076 switch (cmd) { 1077 case SIOCAIFADDR: 1078 case SIOCSIFDSTADDR: 1079 break; 1080 1081 case SIOCSIFADDR: 1082 if_up(ifp); 1083 /* fall through... */ 1084 1085 case SIOCSIFFLAGS: 1086 going_up = ifp->if_flags & IFF_UP && 1087 (ifp->if_flags & IFF_RUNNING) == 0; 1088 going_down = (ifp->if_flags & IFF_UP) == 0 && 1089 ifp->if_flags & IFF_RUNNING; 1090 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1091 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1092 /* sanity */ 1093 newmode = IFF_PASSIVE; 1094 ifp->if_flags &= ~IFF_AUTO; 1095 } 1096 1097 if (going_up || going_down) 1098 lcp.Close(sp); 1099 if (going_up && newmode == 0) { 1100 /* neither auto-dial nor passive */ 1101 ifp->if_flags |= IFF_RUNNING; 1102 if (!(sp->pp_flags & PP_CISCO)) 1103 lcp.Open(sp); 1104 } else if (going_down) { 1105 sppp_flush(ifp); 1106 ifp->if_flags &= ~IFF_RUNNING; 1107 } 1108 1109 break; 1110 1111 #ifdef SIOCSIFMTU 1112 #ifndef ifr_mtu 1113 #define ifr_mtu ifr_metric 1114 #endif 1115 case SIOCSIFMTU: 1116 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1117 error = EINVAL; 1118 break; 1119 } 1120 1121 ifp->if_mtu = ifr->ifr_mtu; 1122 break; 1123 #endif 1124 #ifdef SLIOCSETMTU 1125 case SLIOCSETMTU: 1126 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1127 { 1128 error = EINVAL; 1129 break; 1130 } 1131 1132 ifp->if_mtu = *(short *)data; 1133 break; 1134 #endif 1135 #ifdef SIOCGIFMTU 1136 case SIOCGIFMTU: 1137 ifr->ifr_mtu = ifp->if_mtu; 1138 break; 1139 #endif 1140 #ifdef SLIOCGETMTU 1141 case SLIOCGETMTU: 1142 *(short *)data = ifp->if_mtu; 1143 break; 1144 #endif 1145 case SIOCADDMULTI: 1146 case SIOCDELMULTI: 1147 break; 1148 1149 case SPPPSETAUTHCFG: 1150 case SPPPGETAUTHCFG: 1151 case SPPPSETLCPCFG: 1152 case SPPPGETLCPCFG: 1153 case SPPPSETIDLETO: 1154 case SPPPSETAUTHFAILURE: 1155 case SPPPGETAUTHFAILURES: 1156 case SPPPSETDNSOPTS: 1157 case SPPPSETKEEPALIVE: 1158 { 1159 struct proc *p = curproc; /* XXX */ 1160 1161 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1162 break; 1163 } 1164 /* FALLTHROUGH */ 1165 case SPPPGETSTATUS: 1166 case SPPPGETSTATUSNCP: 1167 case SPPPGETIDLETO: 1168 case SPPPGETDNSOPTS: 1169 case SPPPGETDNSADDRS: 1170 case SPPPGETKEEPALIVE: 1171 error = sppp_params(sp, cmd, data); 1172 break; 1173 1174 default: 1175 error = ENOTTY; 1176 } 1177 splx(s); 1178 return (error); 1179 } 1180 1181 1182 /* 1183 * Cisco framing implementation. 1184 */ 1185 1186 /* 1187 * Handle incoming Cisco keepalive protocol packets. 1188 */ 1189 static void 1190 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1191 { 1192 STDDCL; 1193 struct cisco_packet *h; 1194 #ifdef INET 1195 u_int32_t me, mymask; 1196 #endif 1197 1198 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1199 if (debug) 1200 log(LOG_DEBUG, 1201 "%s: cisco invalid packet length: %d bytes\n", 1202 ifp->if_xname, m->m_pkthdr.len); 1203 return; 1204 } 1205 h = mtod(m, struct cisco_packet *); 1206 if (debug) 1207 log(LOG_DEBUG, 1208 "%s: cisco input: %d bytes " 1209 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1210 ifp->if_xname, m->m_pkthdr.len, 1211 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1212 (u_int)h->time0, (u_int)h->time1); 1213 switch (ntohl(h->type)) { 1214 default: 1215 if (debug) 1216 addlog("%s: cisco unknown packet type: 0x%x\n", 1217 ifp->if_xname, ntohl(h->type)); 1218 break; 1219 case CISCO_ADDR_REPLY: 1220 /* Reply on address request, ignore */ 1221 break; 1222 case CISCO_KEEPALIVE_REQ: 1223 sp->pp_alivecnt = 0; 1224 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1225 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1226 /* Local and remote sequence numbers are equal. 1227 * Probably, the line is in loopback mode. */ 1228 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1229 printf ("%s: loopback\n", 1230 ifp->if_xname); 1231 sp->pp_loopcnt = 0; 1232 if (ifp->if_flags & IFF_UP) { 1233 if_down(ifp); 1234 IF_PURGE(&sp->pp_cpq); 1235 } 1236 } 1237 ++sp->pp_loopcnt; 1238 1239 /* Generate new local sequence number */ 1240 sp->pp_seq[IDX_LCP] = arc4random(); 1241 break; 1242 } 1243 sp->pp_loopcnt = 0; 1244 if (! (ifp->if_flags & IFF_UP) && 1245 (ifp->if_flags & IFF_RUNNING)) { 1246 if_up(ifp); 1247 } 1248 break; 1249 case CISCO_ADDR_REQ: 1250 #ifdef INET 1251 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1252 if (me != 0L) 1253 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1254 #endif 1255 break; 1256 } 1257 } 1258 1259 /* 1260 * Send Cisco keepalive packet. 1261 */ 1262 static void 1263 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1264 { 1265 STDDCL; 1266 struct ppp_header *h; 1267 struct cisco_packet *ch; 1268 struct mbuf *m; 1269 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1270 1271 MGETHDR(m, M_DONTWAIT, MT_DATA); 1272 if (! m) 1273 return; 1274 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1275 m->m_pkthdr.rcvif = 0; 1276 1277 h = mtod(m, struct ppp_header *); 1278 h->address = CISCO_MULTICAST; 1279 h->control = 0; 1280 h->protocol = htons(CISCO_KEEPALIVE); 1281 1282 ch = (struct cisco_packet *)(h + 1); 1283 ch->type = htonl(type); 1284 ch->par1 = htonl(par1); 1285 ch->par2 = htonl(par2); 1286 ch->rel = -1; 1287 1288 ch->time0 = htons((u_short)(t >> 16)); 1289 ch->time1 = htons((u_short) t); 1290 1291 if (debug) 1292 log(LOG_DEBUG, 1293 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1294 ifp->if_xname, ntohl(ch->type), ch->par1, 1295 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1296 (u_int)ch->time1); 1297 1298 if (IF_QFULL(&sp->pp_cpq)) { 1299 IF_DROP(&sp->pp_fastq); 1300 IF_DROP(&ifp->if_snd); 1301 m_freem(m); 1302 ++ifp->if_oerrors; 1303 return; 1304 } else 1305 IF_ENQUEUE(&sp->pp_cpq, m); 1306 if (! (ifp->if_flags & IFF_OACTIVE)) 1307 (*ifp->if_start)(ifp); 1308 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1309 } 1310 1311 /* 1312 * PPP protocol implementation. 1313 */ 1314 1315 /* 1316 * Send PPP control protocol packet. 1317 */ 1318 static void 1319 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1320 u_char ident, u_short len, void *data) 1321 { 1322 STDDCL; 1323 struct lcp_header *lh; 1324 struct mbuf *m; 1325 size_t pkthdrlen; 1326 1327 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1328 1329 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1330 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1331 MGETHDR(m, M_DONTWAIT, MT_DATA); 1332 if (! m) 1333 return; 1334 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1335 m->m_pkthdr.rcvif = 0; 1336 1337 if (sp->pp_flags & PP_NOFRAMING) { 1338 *mtod(m, u_int16_t *) = htons(proto); 1339 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1340 } else { 1341 struct ppp_header *h; 1342 h = mtod(m, struct ppp_header *); 1343 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1344 h->control = PPP_UI; /* Unnumbered Info */ 1345 h->protocol = htons(proto); /* Link Control Protocol */ 1346 lh = (struct lcp_header *)(h + 1); 1347 } 1348 lh->type = type; 1349 lh->ident = ident; 1350 lh->len = htons(LCP_HEADER_LEN + len); 1351 if (len) 1352 bcopy (data, lh + 1, len); 1353 1354 if (debug) { 1355 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1356 ifp->if_xname, 1357 sppp_proto_name(proto), 1358 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1359 if (len) 1360 sppp_print_bytes((u_char *)(lh + 1), len); 1361 addlog(">\n"); 1362 } 1363 if (IF_QFULL(&sp->pp_cpq)) { 1364 IF_DROP(&sp->pp_fastq); 1365 IF_DROP(&ifp->if_snd); 1366 m_freem(m); 1367 ++ifp->if_oerrors; 1368 return; 1369 } else 1370 IF_ENQUEUE(&sp->pp_cpq, m); 1371 if (! (ifp->if_flags & IFF_OACTIVE)) 1372 (*ifp->if_start)(ifp); 1373 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1374 } 1375 1376 /* 1377 * Handle incoming PPP control protocol packets. 1378 */ 1379 static void 1380 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1381 { 1382 STDDCL; 1383 struct lcp_header *h; 1384 int printlen, len = m->m_pkthdr.len; 1385 int rv; 1386 u_char *p; 1387 u_int32_t u32; 1388 1389 if (len < 4) { 1390 if (debug) 1391 log(LOG_DEBUG, 1392 "%s: %s invalid packet length: %d bytes\n", 1393 ifp->if_xname, cp->name, len); 1394 return; 1395 } 1396 h = mtod(m, struct lcp_header *); 1397 if (debug) { 1398 printlen = ntohs(h->len); 1399 log(LOG_DEBUG, 1400 "%s: %s input(%s): <%s id=0x%x len=%d", 1401 ifp->if_xname, cp->name, 1402 sppp_state_name(sp->state[cp->protoidx]), 1403 sppp_cp_type_name(h->type), h->ident, printlen); 1404 if (len < printlen) 1405 printlen = len; 1406 if (printlen > 4) 1407 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1408 addlog(">\n"); 1409 } 1410 if (len > ntohs(h->len)) 1411 len = ntohs(h->len); 1412 p = (u_char *)(h + 1); 1413 switch (h->type) { 1414 case CONF_REQ: 1415 if (len < 4) { 1416 if (debug) 1417 addlog("%s: %s invalid conf-req length %d\n", 1418 ifp->if_xname, cp->name, 1419 len); 1420 ++ifp->if_ierrors; 1421 break; 1422 } 1423 /* handle states where RCR doesn't get a SCA/SCN */ 1424 switch (sp->state[cp->protoidx]) { 1425 case STATE_CLOSING: 1426 case STATE_STOPPING: 1427 return; 1428 case STATE_CLOSED: 1429 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1430 0, 0); 1431 return; 1432 } 1433 rv = (cp->RCR)(sp, h, len); 1434 if (rv < 0) { 1435 /* fatal error, shut down */ 1436 (cp->tld)(sp); 1437 sppp_lcp_tlf(sp); 1438 return; 1439 } 1440 switch (sp->state[cp->protoidx]) { 1441 case STATE_OPENED: 1442 (cp->tld)(sp); 1443 (cp->scr)(sp); 1444 /* fall through... */ 1445 case STATE_ACK_SENT: 1446 case STATE_REQ_SENT: 1447 sppp_cp_change_state(cp, sp, rv? 1448 STATE_ACK_SENT: STATE_REQ_SENT); 1449 break; 1450 case STATE_STOPPED: 1451 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1452 (cp->scr)(sp); 1453 sppp_cp_change_state(cp, sp, rv? 1454 STATE_ACK_SENT: STATE_REQ_SENT); 1455 break; 1456 case STATE_ACK_RCVD: 1457 if (rv) { 1458 sppp_cp_change_state(cp, sp, STATE_OPENED); 1459 if (debug) 1460 log(LOG_DEBUG, "%s: %s tlu\n", 1461 ifp->if_xname, 1462 cp->name); 1463 (cp->tlu)(sp); 1464 } else 1465 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1466 break; 1467 default: 1468 printf("%s: %s illegal %s in state %s\n", 1469 ifp->if_xname, cp->name, 1470 sppp_cp_type_name(h->type), 1471 sppp_state_name(sp->state[cp->protoidx])); 1472 ++ifp->if_ierrors; 1473 } 1474 break; 1475 case CONF_ACK: 1476 if (h->ident != sp->confid[cp->protoidx]) { 1477 if (debug) 1478 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1479 ifp->if_xname, cp->name, 1480 h->ident, sp->confid[cp->protoidx]); 1481 ++ifp->if_ierrors; 1482 break; 1483 } 1484 switch (sp->state[cp->protoidx]) { 1485 case STATE_CLOSED: 1486 case STATE_STOPPED: 1487 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1488 break; 1489 case STATE_CLOSING: 1490 case STATE_STOPPING: 1491 break; 1492 case STATE_REQ_SENT: 1493 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1494 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1495 break; 1496 case STATE_OPENED: 1497 (cp->tld)(sp); 1498 /* fall through */ 1499 case STATE_ACK_RCVD: 1500 (cp->scr)(sp); 1501 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1502 break; 1503 case STATE_ACK_SENT: 1504 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1505 sppp_cp_change_state(cp, sp, STATE_OPENED); 1506 if (debug) 1507 log(LOG_DEBUG, "%s: %s tlu\n", 1508 ifp->if_xname, cp->name); 1509 (cp->tlu)(sp); 1510 break; 1511 default: 1512 printf("%s: %s illegal %s in state %s\n", 1513 ifp->if_xname, cp->name, 1514 sppp_cp_type_name(h->type), 1515 sppp_state_name(sp->state[cp->protoidx])); 1516 ++ifp->if_ierrors; 1517 } 1518 break; 1519 case CONF_NAK: 1520 case CONF_REJ: 1521 if (h->ident != sp->confid[cp->protoidx]) { 1522 if (debug) 1523 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1524 ifp->if_xname, cp->name, 1525 h->ident, sp->confid[cp->protoidx]); 1526 ++ifp->if_ierrors; 1527 break; 1528 } 1529 if (h->type == CONF_NAK) 1530 (cp->RCN_nak)(sp, h, len); 1531 else /* CONF_REJ */ 1532 (cp->RCN_rej)(sp, h, len); 1533 1534 switch (sp->state[cp->protoidx]) { 1535 case STATE_CLOSED: 1536 case STATE_STOPPED: 1537 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1538 break; 1539 case STATE_REQ_SENT: 1540 case STATE_ACK_SENT: 1541 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1542 (cp->scr)(sp); 1543 break; 1544 case STATE_OPENED: 1545 (cp->tld)(sp); 1546 /* fall through */ 1547 case STATE_ACK_RCVD: 1548 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1549 (cp->scr)(sp); 1550 break; 1551 case STATE_CLOSING: 1552 case STATE_STOPPING: 1553 break; 1554 default: 1555 printf("%s: %s illegal %s in state %s\n", 1556 ifp->if_xname, cp->name, 1557 sppp_cp_type_name(h->type), 1558 sppp_state_name(sp->state[cp->protoidx])); 1559 ++ifp->if_ierrors; 1560 } 1561 break; 1562 1563 case TERM_REQ: 1564 switch (sp->state[cp->protoidx]) { 1565 case STATE_ACK_RCVD: 1566 case STATE_ACK_SENT: 1567 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1568 /* fall through */ 1569 case STATE_CLOSED: 1570 case STATE_STOPPED: 1571 case STATE_CLOSING: 1572 case STATE_STOPPING: 1573 case STATE_REQ_SENT: 1574 sta: 1575 /* Send Terminate-Ack packet. */ 1576 if (debug) 1577 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1578 ifp->if_xname, cp->name); 1579 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1580 break; 1581 case STATE_OPENED: 1582 (cp->tld)(sp); 1583 sp->rst_counter[cp->protoidx] = 0; 1584 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1585 goto sta; 1586 default: 1587 printf("%s: %s illegal %s in state %s\n", 1588 ifp->if_xname, cp->name, 1589 sppp_cp_type_name(h->type), 1590 sppp_state_name(sp->state[cp->protoidx])); 1591 ++ifp->if_ierrors; 1592 } 1593 break; 1594 case TERM_ACK: 1595 switch (sp->state[cp->protoidx]) { 1596 case STATE_CLOSED: 1597 case STATE_STOPPED: 1598 case STATE_REQ_SENT: 1599 case STATE_ACK_SENT: 1600 break; 1601 case STATE_CLOSING: 1602 (cp->tlf)(sp); 1603 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1604 sppp_lcp_check_and_close(sp); 1605 break; 1606 case STATE_STOPPING: 1607 (cp->tlf)(sp); 1608 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1609 sppp_lcp_check_and_close(sp); 1610 break; 1611 case STATE_ACK_RCVD: 1612 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1613 break; 1614 case STATE_OPENED: 1615 (cp->tld)(sp); 1616 (cp->scr)(sp); 1617 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1618 break; 1619 default: 1620 printf("%s: %s illegal %s in state %s\n", 1621 ifp->if_xname, cp->name, 1622 sppp_cp_type_name(h->type), 1623 sppp_state_name(sp->state[cp->protoidx])); 1624 ++ifp->if_ierrors; 1625 } 1626 break; 1627 case CODE_REJ: 1628 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1629 log(LOG_INFO, 1630 "%s: %s: ignoring RXJ (%s) for code ?, " 1631 "danger will robinson\n", 1632 ifp->if_xname, cp->name, 1633 sppp_cp_type_name(h->type)); 1634 switch (sp->state[cp->protoidx]) { 1635 case STATE_CLOSED: 1636 case STATE_STOPPED: 1637 case STATE_REQ_SENT: 1638 case STATE_ACK_SENT: 1639 case STATE_CLOSING: 1640 case STATE_STOPPING: 1641 case STATE_OPENED: 1642 break; 1643 case STATE_ACK_RCVD: 1644 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1645 break; 1646 default: 1647 printf("%s: %s illegal %s in state %s\n", 1648 ifp->if_xname, cp->name, 1649 sppp_cp_type_name(h->type), 1650 sppp_state_name(sp->state[cp->protoidx])); 1651 ++ifp->if_ierrors; 1652 } 1653 break; 1654 case PROTO_REJ: 1655 { 1656 int catastrophic; 1657 const struct cp *upper; 1658 int i; 1659 u_int16_t proto; 1660 1661 catastrophic = 0; 1662 upper = NULL; 1663 proto = p[0] << 8 | p[1]; 1664 for (i = 0; i < IDX_COUNT; i++) { 1665 if (cps[i]->proto == proto) { 1666 upper = cps[i]; 1667 break; 1668 } 1669 } 1670 if (upper == NULL) 1671 catastrophic++; 1672 1673 if (debug) 1674 log(LOG_INFO, 1675 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1676 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1677 sppp_cp_type_name(h->type), proto, 1678 upper ? upper->name : "unknown", 1679 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1680 1681 /* 1682 * if we got RXJ+ against conf-req, the peer does not implement 1683 * this particular protocol type. terminate the protocol. 1684 */ 1685 if (upper && !catastrophic) { 1686 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1687 upper->Close(sp); 1688 break; 1689 } 1690 } 1691 1692 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1693 switch (sp->state[cp->protoidx]) { 1694 case STATE_CLOSED: 1695 case STATE_STOPPED: 1696 case STATE_REQ_SENT: 1697 case STATE_ACK_SENT: 1698 case STATE_CLOSING: 1699 case STATE_STOPPING: 1700 case STATE_OPENED: 1701 break; 1702 case STATE_ACK_RCVD: 1703 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1704 break; 1705 default: 1706 printf("%s: %s illegal %s in state %s\n", 1707 ifp->if_xname, cp->name, 1708 sppp_cp_type_name(h->type), 1709 sppp_state_name(sp->state[cp->protoidx])); 1710 ++ifp->if_ierrors; 1711 } 1712 break; 1713 } 1714 case DISC_REQ: 1715 if (cp->proto != PPP_LCP) 1716 goto illegal; 1717 /* Discard the packet. */ 1718 break; 1719 case ECHO_REQ: 1720 if (cp->proto != PPP_LCP) 1721 goto illegal; 1722 if (sp->state[cp->protoidx] != STATE_OPENED) { 1723 if (debug) 1724 addlog("%s: lcp echo req but lcp closed\n", 1725 ifp->if_xname); 1726 ++ifp->if_ierrors; 1727 break; 1728 } 1729 if (len < 8) { 1730 if (debug) 1731 addlog("%s: invalid lcp echo request " 1732 "packet length: %d bytes\n", 1733 ifp->if_xname, len); 1734 break; 1735 } 1736 memcpy(&u32, h + 1, sizeof u32); 1737 if (ntohl(u32) == sp->lcp.magic) { 1738 /* Line loopback mode detected. */ 1739 printf("%s: loopback\n", ifp->if_xname); 1740 if_down(ifp); 1741 IF_PURGE(&sp->pp_cpq); 1742 1743 /* Shut down the PPP link. */ 1744 /* XXX */ 1745 lcp.Down(sp); 1746 lcp.Up(sp); 1747 break; 1748 } 1749 u32 = htonl(sp->lcp.magic); 1750 memcpy(h + 1, &u32, sizeof u32); 1751 if (debug) 1752 addlog("%s: got lcp echo req, sending echo rep\n", 1753 ifp->if_xname); 1754 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1755 h + 1); 1756 break; 1757 case ECHO_REPLY: 1758 if (cp->proto != PPP_LCP) 1759 goto illegal; 1760 if (h->ident != sp->lcp.echoid) { 1761 ++ifp->if_ierrors; 1762 break; 1763 } 1764 if (len < 8) { 1765 if (debug) 1766 addlog("%s: lcp invalid echo reply " 1767 "packet length: %d bytes\n", 1768 ifp->if_xname, len); 1769 break; 1770 } 1771 if (debug) 1772 addlog("%s: lcp got echo rep\n", 1773 ifp->if_xname); 1774 memcpy(&u32, h + 1, sizeof u32); 1775 if (ntohl(u32) != sp->lcp.magic) 1776 sp->pp_alivecnt = 0; 1777 break; 1778 default: 1779 /* Unknown packet type -- send Code-Reject packet. */ 1780 illegal: 1781 if (debug) 1782 addlog("%s: %s send code-rej for 0x%x\n", 1783 ifp->if_xname, cp->name, h->type); 1784 sppp_cp_send(sp, cp->proto, CODE_REJ, 1785 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1786 ++ifp->if_ierrors; 1787 } 1788 } 1789 1790 1791 /* 1792 * The generic part of all Up/Down/Open/Close/TO event handlers. 1793 * Basically, the state transition handling in the automaton. 1794 */ 1795 static void 1796 sppp_up_event(const struct cp *cp, struct sppp *sp) 1797 { 1798 STDDCL; 1799 1800 if (debug) 1801 log(LOG_DEBUG, "%s: %s up(%s)\n", 1802 ifp->if_xname, cp->name, 1803 sppp_state_name(sp->state[cp->protoidx])); 1804 1805 switch (sp->state[cp->protoidx]) { 1806 case STATE_INITIAL: 1807 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1808 break; 1809 case STATE_STARTING: 1810 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1811 (cp->scr)(sp); 1812 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1813 break; 1814 default: 1815 printf("%s: %s illegal up in state %s\n", 1816 ifp->if_xname, cp->name, 1817 sppp_state_name(sp->state[cp->protoidx])); 1818 } 1819 } 1820 1821 static void 1822 sppp_down_event(const struct cp *cp, struct sppp *sp) 1823 { 1824 STDDCL; 1825 1826 if (debug) 1827 log(LOG_DEBUG, "%s: %s down(%s)\n", 1828 ifp->if_xname, cp->name, 1829 sppp_state_name(sp->state[cp->protoidx])); 1830 1831 switch (sp->state[cp->protoidx]) { 1832 case STATE_CLOSED: 1833 case STATE_CLOSING: 1834 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1835 break; 1836 case STATE_STOPPED: 1837 (cp->tls)(sp); 1838 /* fall through */ 1839 case STATE_STOPPING: 1840 case STATE_REQ_SENT: 1841 case STATE_ACK_RCVD: 1842 case STATE_ACK_SENT: 1843 sppp_cp_change_state(cp, sp, STATE_STARTING); 1844 break; 1845 case STATE_OPENED: 1846 (cp->tld)(sp); 1847 sppp_cp_change_state(cp, sp, STATE_STARTING); 1848 break; 1849 default: 1850 printf("%s: %s illegal down in state %s\n", 1851 ifp->if_xname, cp->name, 1852 sppp_state_name(sp->state[cp->protoidx])); 1853 } 1854 } 1855 1856 1857 static void 1858 sppp_open_event(const struct cp *cp, struct sppp *sp) 1859 { 1860 STDDCL; 1861 1862 if (debug) 1863 log(LOG_DEBUG, "%s: %s open(%s)\n", 1864 ifp->if_xname, cp->name, 1865 sppp_state_name(sp->state[cp->protoidx])); 1866 1867 switch (sp->state[cp->protoidx]) { 1868 case STATE_INITIAL: 1869 (cp->tls)(sp); 1870 sppp_cp_change_state(cp, sp, STATE_STARTING); 1871 break; 1872 case STATE_STARTING: 1873 break; 1874 case STATE_CLOSED: 1875 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1876 (cp->scr)(sp); 1877 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1878 break; 1879 case STATE_STOPPED: 1880 case STATE_STOPPING: 1881 case STATE_REQ_SENT: 1882 case STATE_ACK_RCVD: 1883 case STATE_ACK_SENT: 1884 case STATE_OPENED: 1885 break; 1886 case STATE_CLOSING: 1887 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1888 break; 1889 } 1890 } 1891 1892 1893 static void 1894 sppp_close_event(const struct cp *cp, struct sppp *sp) 1895 { 1896 STDDCL; 1897 1898 if (debug) 1899 log(LOG_DEBUG, "%s: %s close(%s)\n", 1900 ifp->if_xname, cp->name, 1901 sppp_state_name(sp->state[cp->protoidx])); 1902 1903 switch (sp->state[cp->protoidx]) { 1904 case STATE_INITIAL: 1905 case STATE_CLOSED: 1906 case STATE_CLOSING: 1907 break; 1908 case STATE_STARTING: 1909 (cp->tlf)(sp); 1910 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1911 break; 1912 case STATE_STOPPED: 1913 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1914 break; 1915 case STATE_STOPPING: 1916 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1917 break; 1918 case STATE_OPENED: 1919 (cp->tld)(sp); 1920 /* fall through */ 1921 case STATE_REQ_SENT: 1922 case STATE_ACK_RCVD: 1923 case STATE_ACK_SENT: 1924 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1925 sppp_cp_send(sp, cp->proto, TERM_REQ, 1926 ++sp->pp_seq[cp->protoidx], 0, 0); 1927 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1928 break; 1929 } 1930 } 1931 1932 static void 1933 sppp_to_event(const struct cp *cp, struct sppp *sp) 1934 { 1935 STDDCL; 1936 int s; 1937 1938 s = splnet(); 1939 if (debug) 1940 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1941 ifp->if_xname, cp->name, 1942 sppp_state_name(sp->state[cp->protoidx]), 1943 sp->rst_counter[cp->protoidx]); 1944 1945 if (--sp->rst_counter[cp->protoidx] < 0) 1946 /* TO- event */ 1947 switch (sp->state[cp->protoidx]) { 1948 case STATE_CLOSING: 1949 (cp->tlf)(sp); 1950 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1951 sppp_lcp_check_and_close(sp); 1952 break; 1953 case STATE_STOPPING: 1954 (cp->tlf)(sp); 1955 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1956 sppp_lcp_check_and_close(sp); 1957 break; 1958 case STATE_REQ_SENT: 1959 case STATE_ACK_RCVD: 1960 case STATE_ACK_SENT: 1961 (cp->tlf)(sp); 1962 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1963 sppp_lcp_check_and_close(sp); 1964 break; 1965 } 1966 else 1967 /* TO+ event */ 1968 switch (sp->state[cp->protoidx]) { 1969 case STATE_CLOSING: 1970 case STATE_STOPPING: 1971 sppp_cp_send(sp, cp->proto, TERM_REQ, 1972 ++sp->pp_seq[cp->protoidx], 0, 0); 1973 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1974 cp->TO, sp); 1975 break; 1976 case STATE_REQ_SENT: 1977 case STATE_ACK_RCVD: 1978 (cp->scr)(sp); 1979 /* sppp_cp_change_state() will restart the timer */ 1980 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1981 break; 1982 case STATE_ACK_SENT: 1983 (cp->scr)(sp); 1984 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1985 cp->TO, sp); 1986 break; 1987 } 1988 1989 splx(s); 1990 } 1991 1992 /* 1993 * Change the state of a control protocol in the state automaton. 1994 * Takes care of starting/stopping the restart timer. 1995 */ 1996 void 1997 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1998 { 1999 sp->state[cp->protoidx] = newstate; 2000 callout_stop(&sp->ch[cp->protoidx]); 2001 switch (newstate) { 2002 case STATE_INITIAL: 2003 case STATE_STARTING: 2004 case STATE_CLOSED: 2005 case STATE_STOPPED: 2006 case STATE_OPENED: 2007 break; 2008 case STATE_CLOSING: 2009 case STATE_STOPPING: 2010 case STATE_REQ_SENT: 2011 case STATE_ACK_RCVD: 2012 case STATE_ACK_SENT: 2013 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2014 cp->TO, sp); 2015 break; 2016 } 2017 } 2018 2019 /* 2020 *--------------------------------------------------------------------------* 2021 * * 2022 * The LCP implementation. * 2023 * * 2024 *--------------------------------------------------------------------------* 2025 */ 2026 static void 2027 sppp_lcp_init(struct sppp *sp) 2028 { 2029 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2030 sp->lcp.magic = 0; 2031 sp->state[IDX_LCP] = STATE_INITIAL; 2032 sp->fail_counter[IDX_LCP] = 0; 2033 sp->pp_seq[IDX_LCP] = 0; 2034 sp->pp_rseq[IDX_LCP] = 0; 2035 sp->lcp.protos = 0; 2036 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2037 2038 /* 2039 * Initialize counters and timeout values. Note that we don't 2040 * use the 3 seconds suggested in RFC 1661 since we are likely 2041 * running on a fast link. XXX We should probably implement 2042 * the exponential backoff option. Note that these values are 2043 * relevant for all control protocols, not just LCP only. 2044 */ 2045 sp->lcp.timeout = 1 * hz; 2046 sp->lcp.max_terminate = 2; 2047 sp->lcp.max_configure = 10; 2048 sp->lcp.max_failure = 10; 2049 callout_init(&sp->ch[IDX_LCP]); 2050 } 2051 2052 static void 2053 sppp_lcp_up(struct sppp *sp) 2054 { 2055 STDDCL; 2056 2057 /* Initialize activity timestamp: opening a connection is an activity */ 2058 sp->pp_last_receive = sp->pp_last_activity = mono_time.tv_sec; 2059 2060 /* 2061 * If this interface is passive or dial-on-demand, and we are 2062 * still in Initial state, it means we've got an incoming 2063 * call. Activate the interface. 2064 */ 2065 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2066 if (debug) 2067 log(LOG_DEBUG, 2068 "%s: Up event", ifp->if_xname); 2069 ifp->if_flags |= IFF_RUNNING; 2070 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2071 if (debug) 2072 addlog("(incoming call)\n"); 2073 sp->pp_flags |= PP_CALLIN; 2074 lcp.Open(sp); 2075 } else if (debug) 2076 addlog("\n"); 2077 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2078 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2079 ifp->if_flags |= IFF_RUNNING; 2080 lcp.Open(sp); 2081 } 2082 2083 sppp_up_event(&lcp, sp); 2084 } 2085 2086 static void 2087 sppp_lcp_down(struct sppp *sp) 2088 { 2089 STDDCL; 2090 2091 sppp_down_event(&lcp, sp); 2092 2093 /* 2094 * If this is neither a dial-on-demand nor a passive 2095 * interface, simulate an ``ifconfig down'' action, so the 2096 * administrator can force a redial by another ``ifconfig 2097 * up''. XXX For leased line operation, should we immediately 2098 * try to reopen the connection here? 2099 */ 2100 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2101 if (debug) 2102 log(LOG_INFO, 2103 "%s: Down event (carrier loss), taking interface down.\n", 2104 ifp->if_xname); 2105 if_down(ifp); 2106 } else { 2107 if (debug) 2108 log(LOG_DEBUG, 2109 "%s: Down event (carrier loss)\n", 2110 ifp->if_xname); 2111 } 2112 sp->pp_flags &= ~PP_CALLIN; 2113 if (sp->state[IDX_LCP] != STATE_INITIAL) 2114 lcp.Close(sp); 2115 ifp->if_flags &= ~IFF_RUNNING; 2116 } 2117 2118 static void 2119 sppp_lcp_open(struct sppp *sp) 2120 { 2121 /* 2122 * If we are authenticator, negotiate LCP_AUTH 2123 */ 2124 if (sp->hisauth.proto != 0) 2125 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2126 else 2127 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2128 sp->pp_flags &= ~PP_NEEDAUTH; 2129 sppp_open_event(&lcp, sp); 2130 } 2131 2132 static void 2133 sppp_lcp_close(struct sppp *sp) 2134 { 2135 sppp_close_event(&lcp, sp); 2136 } 2137 2138 static void 2139 sppp_lcp_TO(void *cookie) 2140 { 2141 sppp_to_event(&lcp, (struct sppp *)cookie); 2142 } 2143 2144 /* 2145 * Analyze a configure request. Return true if it was agreeable, and 2146 * caused action sca, false if it has been rejected or nak'ed, and 2147 * caused action scn. (The return value is used to make the state 2148 * transition decision in the state automaton.) 2149 */ 2150 static int 2151 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2152 { 2153 STDDCL; 2154 u_char *buf, *r, *p; 2155 int origlen, rlen; 2156 u_int32_t nmagic; 2157 u_short authproto; 2158 2159 len -= 4; 2160 origlen = len; 2161 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2162 if (! buf) 2163 return (0); 2164 2165 if (debug) 2166 log(LOG_DEBUG, "%s: lcp parse opts:", 2167 ifp->if_xname); 2168 2169 /* pass 1: check for things that need to be rejected */ 2170 p = (void *)(h + 1); 2171 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2172 /* Sanity check option length */ 2173 if (p[1] > len) { 2174 /* 2175 * Malicious option - drop imediately. 2176 * XXX Maybe we should just RXJ it? 2177 */ 2178 addlog("%s: received malicious LCP option 0x%02x, " 2179 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2180 p[0], p[1], len); 2181 goto drop; 2182 } 2183 if (debug) 2184 addlog(" %s", sppp_lcp_opt_name(*p)); 2185 switch (*p) { 2186 case LCP_OPT_MAGIC: 2187 /* Magic number. */ 2188 /* fall through, both are same length */ 2189 case LCP_OPT_ASYNC_MAP: 2190 /* Async control character map. */ 2191 if (len >= 6 || p[1] == 6) 2192 continue; 2193 if (debug) 2194 addlog(" [invalid]"); 2195 break; 2196 case LCP_OPT_MRU: 2197 /* Maximum receive unit. */ 2198 if (len >= 4 && p[1] == 4) 2199 continue; 2200 if (debug) 2201 addlog(" [invalid]"); 2202 break; 2203 case LCP_OPT_AUTH_PROTO: 2204 if (len < 4) { 2205 if (debug) 2206 addlog(" [invalid]"); 2207 break; 2208 } 2209 authproto = (p[2] << 8) + p[3]; 2210 if (authproto == PPP_CHAP && p[1] != 5) { 2211 if (debug) 2212 addlog(" [invalid chap len]"); 2213 break; 2214 } 2215 if (sp->myauth.proto == 0) { 2216 /* we are not configured to do auth */ 2217 if (debug) 2218 addlog(" [not configured]"); 2219 break; 2220 } 2221 /* 2222 * Remote want us to authenticate, remember this, 2223 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2224 * up. 2225 */ 2226 sp->pp_flags |= PP_NEEDAUTH; 2227 continue; 2228 default: 2229 /* Others not supported. */ 2230 if (debug) 2231 addlog(" [rej]"); 2232 break; 2233 } 2234 /* Add the option to rejected list. */ 2235 bcopy (p, r, p[1]); 2236 r += p[1]; 2237 rlen += p[1]; 2238 } 2239 if (rlen) { 2240 if (debug) 2241 addlog(" send conf-rej\n"); 2242 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2243 goto end; 2244 } else if (debug) 2245 addlog("\n"); 2246 2247 /* 2248 * pass 2: check for option values that are unacceptable and 2249 * thus require to be nak'ed. 2250 */ 2251 if (debug) 2252 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2253 ifp->if_xname); 2254 2255 p = (void *)(h + 1); 2256 len = origlen; 2257 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2258 if (debug) 2259 addlog(" %s", sppp_lcp_opt_name(*p)); 2260 switch (*p) { 2261 case LCP_OPT_MAGIC: 2262 /* Magic number -- extract. */ 2263 nmagic = (u_int32_t)p[2] << 24 | 2264 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2265 if (nmagic != sp->lcp.magic) { 2266 if (debug) 2267 addlog(" 0x%x", nmagic); 2268 continue; 2269 } 2270 /* 2271 * Local and remote magics equal -- loopback? 2272 */ 2273 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2274 printf ("%s: loopback\n", 2275 ifp->if_xname); 2276 sp->pp_loopcnt = 0; 2277 if (ifp->if_flags & IFF_UP) { 2278 if_down(ifp); 2279 IF_PURGE(&sp->pp_cpq); 2280 /* XXX ? */ 2281 lcp.Down(sp); 2282 lcp.Up(sp); 2283 } 2284 } else if (debug) 2285 addlog(" [glitch]"); 2286 ++sp->pp_loopcnt; 2287 /* 2288 * We negate our magic here, and NAK it. If 2289 * we see it later in an NAK packet, we 2290 * suggest a new one. 2291 */ 2292 nmagic = ~sp->lcp.magic; 2293 /* Gonna NAK it. */ 2294 p[2] = nmagic >> 24; 2295 p[3] = nmagic >> 16; 2296 p[4] = nmagic >> 8; 2297 p[5] = nmagic; 2298 break; 2299 2300 case LCP_OPT_ASYNC_MAP: 2301 /* 2302 * Async control character map -- just ignore it. 2303 * 2304 * Quote from RFC 1662, chapter 6: 2305 * To enable this functionality, synchronous PPP 2306 * implementations MUST always respond to the 2307 * Async-Control-Character-Map Configuration 2308 * Option with the LCP Configure-Ack. However, 2309 * acceptance of the Configuration Option does 2310 * not imply that the synchronous implementation 2311 * will do any ACCM mapping. Instead, all such 2312 * octet mapping will be performed by the 2313 * asynchronous-to-synchronous converter. 2314 */ 2315 continue; 2316 2317 case LCP_OPT_MRU: 2318 /* 2319 * Maximum receive unit. Always agreeable, 2320 * but ignored by now. 2321 */ 2322 sp->lcp.their_mru = p[2] * 256 + p[3]; 2323 if (debug) 2324 addlog(" %ld", sp->lcp.their_mru); 2325 continue; 2326 2327 case LCP_OPT_AUTH_PROTO: 2328 authproto = (p[2] << 8) + p[3]; 2329 if (sp->myauth.proto != authproto) { 2330 /* not agreed, nak */ 2331 if (debug) 2332 addlog(" [mine %s != his %s]", 2333 sppp_proto_name(sp->myauth.proto), 2334 sppp_proto_name(authproto)); 2335 p[2] = sp->myauth.proto >> 8; 2336 p[3] = sp->myauth.proto; 2337 break; 2338 } 2339 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2340 if (debug) 2341 addlog(" [chap not MD5]"); 2342 p[4] = CHAP_MD5; 2343 break; 2344 } 2345 continue; 2346 } 2347 /* Add the option to nak'ed list. */ 2348 bcopy (p, r, p[1]); 2349 r += p[1]; 2350 rlen += p[1]; 2351 } 2352 if (rlen) { 2353 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2354 if (debug) 2355 addlog(" max_failure (%d) exceeded, " 2356 "send conf-rej\n", 2357 sp->lcp.max_failure); 2358 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2359 } else { 2360 if (debug) 2361 addlog(" send conf-nak\n"); 2362 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2363 } 2364 goto end; 2365 } else { 2366 if (debug) 2367 addlog(" send conf-ack\n"); 2368 sp->fail_counter[IDX_LCP] = 0; 2369 sp->pp_loopcnt = 0; 2370 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2371 } 2372 2373 end: 2374 free(buf, M_TEMP); 2375 return (rlen == 0); 2376 2377 drop: 2378 free(buf, M_TEMP); 2379 return -1; 2380 } 2381 2382 /* 2383 * Analyze the LCP Configure-Reject option list, and adjust our 2384 * negotiation. 2385 */ 2386 static void 2387 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2388 { 2389 STDDCL; 2390 u_char *buf, *p; 2391 2392 len -= 4; 2393 buf = malloc (len, M_TEMP, M_NOWAIT); 2394 if (!buf) 2395 return; 2396 2397 if (debug) 2398 log(LOG_DEBUG, "%s: lcp rej opts:", 2399 ifp->if_xname); 2400 2401 p = (void *)(h + 1); 2402 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2403 /* Sanity check option length */ 2404 if (p[1] > len) { 2405 /* 2406 * Malicious option - drop imediately. 2407 * XXX Maybe we should just RXJ it? 2408 */ 2409 addlog("%s: received malicious LCP option, " 2410 "dropping.\n", ifp->if_xname); 2411 goto drop; 2412 } 2413 if (debug) 2414 addlog(" %s", sppp_lcp_opt_name(*p)); 2415 switch (*p) { 2416 case LCP_OPT_MAGIC: 2417 /* Magic number -- can't use it, use 0 */ 2418 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2419 sp->lcp.magic = 0; 2420 break; 2421 case LCP_OPT_MRU: 2422 /* 2423 * Should not be rejected anyway, since we only 2424 * negotiate a MRU if explicitly requested by 2425 * peer. 2426 */ 2427 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2428 break; 2429 case LCP_OPT_AUTH_PROTO: 2430 /* 2431 * Peer doesn't want to authenticate himself, 2432 * deny unless this is a dialout call, and 2433 * SPPP_AUTHFLAG_NOCALLOUT is set. 2434 */ 2435 if ((sp->pp_flags & PP_CALLIN) == 0 && 2436 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2437 if (debug) 2438 addlog(" [don't insist on auth " 2439 "for callout]"); 2440 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2441 break; 2442 } 2443 if (debug) 2444 addlog("[access denied]\n"); 2445 lcp.Close(sp); 2446 break; 2447 } 2448 } 2449 if (debug) 2450 addlog("\n"); 2451 drop: 2452 free(buf, M_TEMP); 2453 return; 2454 } 2455 2456 /* 2457 * Analyze the LCP Configure-NAK option list, and adjust our 2458 * negotiation. 2459 */ 2460 static void 2461 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2462 { 2463 STDDCL; 2464 u_char *buf, *p; 2465 u_int32_t magic; 2466 2467 len -= 4; 2468 buf = malloc (len, M_TEMP, M_NOWAIT); 2469 if (!buf) 2470 return; 2471 2472 if (debug) 2473 log(LOG_DEBUG, "%s: lcp nak opts:", 2474 ifp->if_xname); 2475 2476 p = (void *)(h + 1); 2477 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2478 /* Sanity check option length */ 2479 if (p[1] > len) { 2480 /* 2481 * Malicious option - drop imediately. 2482 * XXX Maybe we should just RXJ it? 2483 */ 2484 addlog("%s: received malicious LCP option, " 2485 "dropping.\n", ifp->if_xname); 2486 goto drop; 2487 } 2488 if (debug) 2489 addlog(" %s", sppp_lcp_opt_name(*p)); 2490 switch (*p) { 2491 case LCP_OPT_MAGIC: 2492 /* Magic number -- renegotiate */ 2493 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2494 len >= 6 && p[1] == 6) { 2495 magic = (u_int32_t)p[2] << 24 | 2496 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2497 /* 2498 * If the remote magic is our negated one, 2499 * this looks like a loopback problem. 2500 * Suggest a new magic to make sure. 2501 */ 2502 if (magic == ~sp->lcp.magic) { 2503 if (debug) 2504 addlog(" magic glitch"); 2505 sp->lcp.magic = arc4random(); 2506 } else { 2507 sp->lcp.magic = magic; 2508 if (debug) 2509 addlog(" %d", magic); 2510 } 2511 } 2512 break; 2513 case LCP_OPT_MRU: 2514 /* 2515 * Peer wants to advise us to negotiate an MRU. 2516 * Agree on it if it's reasonable, or use 2517 * default otherwise. 2518 */ 2519 if (len >= 4 && p[1] == 4) { 2520 u_int mru = p[2] * 256 + p[3]; 2521 if (debug) 2522 addlog(" %d", mru); 2523 if (mru < PP_MTU || mru > PP_MAX_MRU) 2524 mru = PP_MTU; 2525 sp->lcp.mru = mru; 2526 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2527 } 2528 break; 2529 case LCP_OPT_AUTH_PROTO: 2530 /* 2531 * Peer doesn't like our authentication method, 2532 * deny. 2533 */ 2534 if (debug) 2535 addlog("[access denied]\n"); 2536 lcp.Close(sp); 2537 break; 2538 } 2539 } 2540 if (debug) 2541 addlog("\n"); 2542 drop: 2543 free(buf, M_TEMP); 2544 return; 2545 } 2546 2547 static void 2548 sppp_lcp_tlu(struct sppp *sp) 2549 { 2550 STDDCL; 2551 int i; 2552 u_int32_t mask; 2553 2554 /* XXX ? */ 2555 if (! (ifp->if_flags & IFF_UP) && 2556 (ifp->if_flags & IFF_RUNNING)) { 2557 /* Coming out of loopback mode. */ 2558 if_up(ifp); 2559 } 2560 2561 for (i = 0; i < IDX_COUNT; i++) 2562 if ((cps[i])->flags & CP_QUAL) 2563 (cps[i])->Open(sp); 2564 2565 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2566 (sp->pp_flags & PP_NEEDAUTH) != 0) 2567 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2568 else 2569 sp->pp_phase = SPPP_PHASE_NETWORK; 2570 2571 if (debug) 2572 { 2573 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2574 sppp_phase_name(sp->pp_phase)); 2575 } 2576 2577 /* 2578 * Open all authentication protocols. This is even required 2579 * if we already proceeded to network phase, since it might be 2580 * that remote wants us to authenticate, so we might have to 2581 * send a PAP request. Undesired authentication protocols 2582 * don't do anything when they get an Open event. 2583 */ 2584 for (i = 0; i < IDX_COUNT; i++) 2585 if ((cps[i])->flags & CP_AUTH) 2586 (cps[i])->Open(sp); 2587 2588 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2589 /* Notify all NCPs. */ 2590 for (i = 0; i < IDX_COUNT; i++) 2591 if ((cps[i])->flags & CP_NCP) 2592 (cps[i])->Open(sp); 2593 } 2594 2595 /* Send Up events to all started protos. */ 2596 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2597 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2598 (cps[i])->Up(sp); 2599 2600 /* notify low-level driver of state change */ 2601 if (sp->pp_chg) 2602 sp->pp_chg(sp, (int)sp->pp_phase); 2603 2604 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2605 /* if no NCP is starting, close down */ 2606 sppp_lcp_check_and_close(sp); 2607 } 2608 2609 static void 2610 sppp_lcp_tld(struct sppp *sp) 2611 { 2612 STDDCL; 2613 int i; 2614 u_int32_t mask; 2615 2616 sp->pp_phase = SPPP_PHASE_TERMINATE; 2617 2618 if (debug) 2619 { 2620 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2621 sppp_phase_name(sp->pp_phase)); 2622 } 2623 2624 /* 2625 * Take upper layers down. We send the Down event first and 2626 * the Close second to prevent the upper layers from sending 2627 * ``a flurry of terminate-request packets'', as the RFC 2628 * describes it. 2629 */ 2630 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2631 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2632 (cps[i])->Down(sp); 2633 (cps[i])->Close(sp); 2634 } 2635 } 2636 2637 static void 2638 sppp_lcp_tls(struct sppp *sp) 2639 { 2640 STDDCL; 2641 2642 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2643 printf("%s: authentication failed %d times, not retrying again\n", 2644 sp->pp_if.if_xname, sp->pp_auth_failures); 2645 if_down(&sp->pp_if); 2646 return; 2647 } 2648 2649 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2650 2651 if (debug) 2652 { 2653 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2654 sppp_phase_name(sp->pp_phase)); 2655 } 2656 2657 /* Notify lower layer if desired. */ 2658 if (sp->pp_tls) 2659 (sp->pp_tls)(sp); 2660 } 2661 2662 static void 2663 sppp_lcp_tlf(struct sppp *sp) 2664 { 2665 STDDCL; 2666 2667 sp->pp_phase = SPPP_PHASE_DEAD; 2668 2669 if (debug) 2670 { 2671 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2672 sppp_phase_name(sp->pp_phase)); 2673 } 2674 2675 /* Notify lower layer if desired. */ 2676 if (sp->pp_tlf) 2677 (sp->pp_tlf)(sp); 2678 } 2679 2680 static void 2681 sppp_lcp_scr(struct sppp *sp) 2682 { 2683 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2684 int i = 0; 2685 u_short authproto; 2686 2687 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2688 if (! sp->lcp.magic) 2689 sp->lcp.magic = arc4random(); 2690 opt[i++] = LCP_OPT_MAGIC; 2691 opt[i++] = 6; 2692 opt[i++] = sp->lcp.magic >> 24; 2693 opt[i++] = sp->lcp.magic >> 16; 2694 opt[i++] = sp->lcp.magic >> 8; 2695 opt[i++] = sp->lcp.magic; 2696 } 2697 2698 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2699 opt[i++] = LCP_OPT_MRU; 2700 opt[i++] = 4; 2701 opt[i++] = sp->lcp.mru >> 8; 2702 opt[i++] = sp->lcp.mru; 2703 } 2704 2705 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2706 authproto = sp->hisauth.proto; 2707 opt[i++] = LCP_OPT_AUTH_PROTO; 2708 opt[i++] = authproto == PPP_CHAP? 5: 4; 2709 opt[i++] = authproto >> 8; 2710 opt[i++] = authproto; 2711 if (authproto == PPP_CHAP) 2712 opt[i++] = CHAP_MD5; 2713 } 2714 2715 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2716 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2717 } 2718 2719 /* 2720 * Check the open NCPs, return true if at least one NCP is open. 2721 */ 2722 static int 2723 sppp_ncp_check(struct sppp *sp) 2724 { 2725 int i, mask; 2726 2727 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2728 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2729 return 1; 2730 return 0; 2731 } 2732 2733 /* 2734 * Re-check the open NCPs and see if we should terminate the link. 2735 * Called by the NCPs during their tlf action handling. 2736 */ 2737 static void 2738 sppp_lcp_check_and_close(struct sppp *sp) 2739 { 2740 2741 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2742 /* don't bother, we are already going down */ 2743 return; 2744 2745 if (sppp_ncp_check(sp)) 2746 return; 2747 2748 lcp.Close(sp); 2749 } 2750 2751 2752 /* 2753 *--------------------------------------------------------------------------* 2754 * * 2755 * The IPCP implementation. * 2756 * * 2757 *--------------------------------------------------------------------------* 2758 */ 2759 2760 static void 2761 sppp_ipcp_init(struct sppp *sp) 2762 { 2763 sp->ipcp.opts = 0; 2764 sp->ipcp.flags = 0; 2765 sp->state[IDX_IPCP] = STATE_INITIAL; 2766 sp->fail_counter[IDX_IPCP] = 0; 2767 sp->pp_seq[IDX_IPCP] = 0; 2768 sp->pp_rseq[IDX_IPCP] = 0; 2769 callout_init(&sp->ch[IDX_IPCP]); 2770 } 2771 2772 static void 2773 sppp_ipcp_up(struct sppp *sp) 2774 { 2775 sppp_up_event(&ipcp, sp); 2776 } 2777 2778 static void 2779 sppp_ipcp_down(struct sppp *sp) 2780 { 2781 sppp_down_event(&ipcp, sp); 2782 } 2783 2784 static void 2785 sppp_ipcp_open(struct sppp *sp) 2786 { 2787 STDDCL; 2788 u_int32_t myaddr, hisaddr; 2789 2790 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2791 sp->ipcp.req_myaddr = 0; 2792 sp->ipcp.req_hisaddr = 0; 2793 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2794 2795 #ifdef INET 2796 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2797 #else 2798 myaddr = hisaddr = 0; 2799 #endif 2800 /* 2801 * If we don't have his address, this probably means our 2802 * interface doesn't want to talk IP at all. (This could 2803 * be the case if somebody wants to speak only IPX, for 2804 * example.) Don't open IPCP in this case. 2805 */ 2806 if (hisaddr == 0) { 2807 /* XXX this message should go away */ 2808 if (debug) 2809 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2810 ifp->if_xname); 2811 return; 2812 } 2813 2814 if (myaddr == 0) { 2815 /* 2816 * I don't have an assigned address, so i need to 2817 * negotiate my address. 2818 */ 2819 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2820 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2821 } 2822 if (hisaddr == 1) { 2823 /* 2824 * XXX - remove this hack! 2825 * remote has no valid address, we need to get one assigned. 2826 */ 2827 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2828 } 2829 sppp_open_event(&ipcp, sp); 2830 } 2831 2832 static void 2833 sppp_ipcp_close(struct sppp *sp) 2834 { 2835 STDDCL; 2836 2837 sppp_close_event(&ipcp, sp); 2838 #ifdef INET 2839 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2840 /* 2841 * Some address was dynamic, clear it again. 2842 */ 2843 sppp_clear_ip_addrs(sp); 2844 #endif 2845 2846 if (sp->pp_saved_mtu > 0) { 2847 ifp->if_mtu = sp->pp_saved_mtu; 2848 sp->pp_saved_mtu = 0; 2849 if (debug) 2850 log(LOG_DEBUG, 2851 "%s: resetting MTU to %" PRIu64 " bytes\n", 2852 ifp->if_xname, ifp->if_mtu); 2853 } 2854 } 2855 2856 static void 2857 sppp_ipcp_TO(void *cookie) 2858 { 2859 sppp_to_event(&ipcp, (struct sppp *)cookie); 2860 } 2861 2862 /* 2863 * Analyze a configure request. Return true if it was agreeable, and 2864 * caused action sca, false if it has been rejected or nak'ed, and 2865 * caused action scn. (The return value is used to make the state 2866 * transition decision in the state automaton.) 2867 */ 2868 static int 2869 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2870 { 2871 u_char *buf, *r, *p; 2872 struct ifnet *ifp = &sp->pp_if; 2873 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2874 u_int32_t hisaddr, desiredaddr; 2875 2876 len -= 4; 2877 origlen = len; 2878 /* 2879 * Make sure to allocate a buf that can at least hold a 2880 * conf-nak with an `address' option. We might need it below. 2881 */ 2882 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2883 if (! buf) 2884 return (0); 2885 2886 /* pass 1: see if we can recognize them */ 2887 if (debug) 2888 log(LOG_DEBUG, "%s: ipcp parse opts:", 2889 ifp->if_xname); 2890 p = (void *)(h + 1); 2891 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2892 /* Sanity check option length */ 2893 if (p[1] > len) { 2894 /* XXX should we just RXJ? */ 2895 addlog("%s: malicious IPCP option received, dropping\n", 2896 ifp->if_xname); 2897 goto drop; 2898 } 2899 if (debug) 2900 addlog(" %s", sppp_ipcp_opt_name(*p)); 2901 switch (*p) { 2902 #ifdef notyet 2903 case IPCP_OPT_COMPRESSION: 2904 if (len >= 6 && p[1] >= 6) { 2905 /* correctly formed compress option */ 2906 continue; 2907 } 2908 if (debug) 2909 addlog(" [invalid]"); 2910 break; 2911 #endif 2912 case IPCP_OPT_ADDRESS: 2913 if (len >= 6 && p[1] == 6) { 2914 /* correctly formed address option */ 2915 continue; 2916 } 2917 if (debug) 2918 addlog(" [invalid]"); 2919 break; 2920 default: 2921 /* Others not supported. */ 2922 if (debug) 2923 addlog(" [rej]"); 2924 break; 2925 } 2926 /* Add the option to rejected list. */ 2927 bcopy (p, r, p[1]); 2928 r += p[1]; 2929 rlen += p[1]; 2930 } 2931 if (rlen) { 2932 if (debug) 2933 addlog(" send conf-rej\n"); 2934 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2935 goto end; 2936 } else if (debug) 2937 addlog("\n"); 2938 2939 /* pass 2: parse option values */ 2940 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2941 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2942 else 2943 #ifdef INET 2944 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2945 #else 2946 hisaddr = 0; 2947 #endif 2948 if (debug) 2949 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2950 ifp->if_xname); 2951 p = (void *)(h + 1); 2952 len = origlen; 2953 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2954 if (debug) 2955 addlog(" %s", sppp_ipcp_opt_name(*p)); 2956 switch (*p) { 2957 #ifdef notyet 2958 case IPCP_OPT_COMPRESSION: 2959 continue; 2960 #endif 2961 case IPCP_OPT_ADDRESS: 2962 desiredaddr = p[2] << 24 | p[3] << 16 | 2963 p[4] << 8 | p[5]; 2964 if (desiredaddr == hisaddr || 2965 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2966 /* 2967 * Peer's address is same as our value, 2968 * this is agreeable. Gonna conf-ack 2969 * it. 2970 */ 2971 if (debug) 2972 addlog(" %s [ack]", 2973 sppp_dotted_quad(hisaddr)); 2974 /* record that we've seen it already */ 2975 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2976 sp->ipcp.req_hisaddr = desiredaddr; 2977 hisaddr = desiredaddr; 2978 continue; 2979 } 2980 /* 2981 * The address wasn't agreeable. This is either 2982 * he sent us 0.0.0.0, asking to assign him an 2983 * address, or he send us another address not 2984 * matching our value. Either case, we gonna 2985 * conf-nak it with our value. 2986 */ 2987 if (debug) { 2988 if (desiredaddr == 0) 2989 addlog(" [addr requested]"); 2990 else 2991 addlog(" %s [not agreed]", 2992 sppp_dotted_quad(desiredaddr)); 2993 } 2994 2995 p[2] = hisaddr >> 24; 2996 p[3] = hisaddr >> 16; 2997 p[4] = hisaddr >> 8; 2998 p[5] = hisaddr; 2999 break; 3000 } 3001 /* Add the option to nak'ed list. */ 3002 bcopy (p, r, p[1]); 3003 r += p[1]; 3004 rlen += p[1]; 3005 } 3006 3007 /* 3008 * If we are about to conf-ack the request, but haven't seen 3009 * his address so far, gonna conf-nak it instead, with the 3010 * `address' option present and our idea of his address being 3011 * filled in there, to request negotiation of both addresses. 3012 * 3013 * XXX This can result in an endless req - nak loop if peer 3014 * doesn't want to send us his address. Q: What should we do 3015 * about it? XXX A: implement the max-failure counter. 3016 */ 3017 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 3018 buf[0] = IPCP_OPT_ADDRESS; 3019 buf[1] = 6; 3020 buf[2] = hisaddr >> 24; 3021 buf[3] = hisaddr >> 16; 3022 buf[4] = hisaddr >> 8; 3023 buf[5] = hisaddr; 3024 rlen = 6; 3025 if (debug) 3026 addlog(" still need hisaddr"); 3027 } 3028 3029 if (rlen) { 3030 if (debug) 3031 addlog(" send conf-nak\n"); 3032 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3033 } else { 3034 if (debug) 3035 addlog(" send conf-ack\n"); 3036 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3037 } 3038 3039 end: 3040 free(buf, M_TEMP); 3041 return (rlen == 0); 3042 3043 drop: 3044 free(buf, M_TEMP); 3045 return -1; 3046 } 3047 3048 /* 3049 * Analyze the IPCP Configure-Reject option list, and adjust our 3050 * negotiation. 3051 */ 3052 static void 3053 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3054 { 3055 u_char *buf, *p; 3056 struct ifnet *ifp = &sp->pp_if; 3057 int debug = ifp->if_flags & IFF_DEBUG; 3058 3059 len -= 4; 3060 buf = malloc (len, M_TEMP, M_NOWAIT); 3061 if (!buf) 3062 return; 3063 3064 if (debug) 3065 log(LOG_DEBUG, "%s: ipcp rej opts:", 3066 ifp->if_xname); 3067 3068 p = (void *)(h + 1); 3069 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3070 /* Sanity check option length */ 3071 if (p[1] > len) { 3072 /* XXX should we just RXJ? */ 3073 addlog("%s: malicious IPCP option received, dropping\n", 3074 ifp->if_xname); 3075 goto drop; 3076 } 3077 if (debug) 3078 addlog(" %s", sppp_ipcp_opt_name(*p)); 3079 switch (*p) { 3080 case IPCP_OPT_ADDRESS: 3081 /* 3082 * Peer doesn't grok address option. This is 3083 * bad. XXX Should we better give up here? 3084 */ 3085 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3086 break; 3087 #ifdef notyet 3088 case IPCP_OPT_COMPRESS: 3089 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3090 break; 3091 #endif 3092 } 3093 } 3094 if (debug) 3095 addlog("\n"); 3096 drop: 3097 free(buf, M_TEMP); 3098 return; 3099 } 3100 3101 /* 3102 * Analyze the IPCP Configure-NAK option list, and adjust our 3103 * negotiation. 3104 */ 3105 static void 3106 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3107 { 3108 u_char *p; 3109 struct ifnet *ifp = &sp->pp_if; 3110 int debug = ifp->if_flags & IFF_DEBUG; 3111 u_int32_t wantaddr; 3112 3113 len -= 4; 3114 3115 if (debug) 3116 log(LOG_DEBUG, "%s: ipcp nak opts:", 3117 ifp->if_xname); 3118 3119 p = (void *)(h + 1); 3120 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3121 /* Sanity check option length */ 3122 if (p[1] > len) { 3123 /* XXX should we just RXJ? */ 3124 addlog("%s: malicious IPCP option received, dropping\n", 3125 ifp->if_xname); 3126 return; 3127 } 3128 if (debug) 3129 addlog(" %s", sppp_ipcp_opt_name(*p)); 3130 switch (*p) { 3131 case IPCP_OPT_ADDRESS: 3132 /* 3133 * Peer doesn't like our local IP address. See 3134 * if we can do something for him. We'll drop 3135 * him our address then. 3136 */ 3137 if (len >= 6 && p[1] == 6) { 3138 wantaddr = p[2] << 24 | p[3] << 16 | 3139 p[4] << 8 | p[5]; 3140 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3141 if (debug) 3142 addlog(" [wantaddr %s]", 3143 sppp_dotted_quad(wantaddr)); 3144 /* 3145 * When doing dynamic address assignment, 3146 * we accept his offer. Otherwise, we 3147 * ignore it and thus continue to negotiate 3148 * our already existing value. 3149 */ 3150 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3151 if (debug) 3152 addlog(" [agree]"); 3153 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3154 sp->ipcp.req_myaddr = wantaddr; 3155 } 3156 } 3157 break; 3158 3159 case IPCP_OPT_PRIMDNS: 3160 if (len >= 6 && p[1] == 6) { 3161 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3162 p[4] << 8 | p[5]; 3163 } 3164 break; 3165 3166 case IPCP_OPT_SECDNS: 3167 if (len >= 6 && p[1] == 6) { 3168 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3169 p[4] << 8 | p[5]; 3170 } 3171 break; 3172 #ifdef notyet 3173 case IPCP_OPT_COMPRESS: 3174 /* 3175 * Peer wants different compression parameters. 3176 */ 3177 break; 3178 #endif 3179 } 3180 } 3181 if (debug) 3182 addlog("\n"); 3183 } 3184 3185 static void 3186 sppp_ipcp_tlu(struct sppp *sp) 3187 { 3188 #ifdef INET 3189 /* we are up. Set addresses and notify anyone interested */ 3190 STDDCL; 3191 u_int32_t myaddr, hisaddr; 3192 3193 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3194 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3195 myaddr = sp->ipcp.req_myaddr; 3196 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3197 hisaddr = sp->ipcp.req_hisaddr; 3198 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3199 3200 if (ifp->if_mtu > sp->lcp.their_mru) { 3201 sp->pp_saved_mtu = ifp->if_mtu; 3202 ifp->if_mtu = sp->lcp.their_mru; 3203 if (debug) 3204 log(LOG_DEBUG, 3205 "%s: setting MTU to %" PRIu64 " bytes\n", 3206 ifp->if_xname, ifp->if_mtu); 3207 } 3208 3209 if (sp->pp_con) 3210 sp->pp_con(sp); 3211 #endif 3212 } 3213 3214 static void 3215 sppp_ipcp_tld(struct sppp *sp) 3216 { 3217 } 3218 3219 static void 3220 sppp_ipcp_tls(struct sppp *sp) 3221 { 3222 /* indicate to LCP that it must stay alive */ 3223 sp->lcp.protos |= (1 << IDX_IPCP); 3224 } 3225 3226 static void 3227 sppp_ipcp_tlf(struct sppp *sp) 3228 { 3229 /* we no longer need LCP */ 3230 sp->lcp.protos &= ~(1 << IDX_IPCP); 3231 } 3232 3233 static void 3234 sppp_ipcp_scr(struct sppp *sp) 3235 { 3236 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3237 #ifdef INET 3238 u_int32_t ouraddr; 3239 #endif 3240 int i = 0; 3241 3242 #ifdef notyet 3243 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3244 opt[i++] = IPCP_OPT_COMPRESSION; 3245 opt[i++] = 6; 3246 opt[i++] = 0; /* VJ header compression */ 3247 opt[i++] = 0x2d; /* VJ header compression */ 3248 opt[i++] = max_slot_id; 3249 opt[i++] = comp_slot_id; 3250 } 3251 #endif 3252 3253 #ifdef INET 3254 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3255 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3256 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3257 else 3258 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3259 opt[i++] = IPCP_OPT_ADDRESS; 3260 opt[i++] = 6; 3261 opt[i++] = ouraddr >> 24; 3262 opt[i++] = ouraddr >> 16; 3263 opt[i++] = ouraddr >> 8; 3264 opt[i++] = ouraddr; 3265 } 3266 #endif 3267 3268 if (sp->query_dns & 1) { 3269 opt[i++] = IPCP_OPT_PRIMDNS; 3270 opt[i++] = 6; 3271 opt[i++] = sp->dns_addrs[0] >> 24; 3272 opt[i++] = sp->dns_addrs[0] >> 16; 3273 opt[i++] = sp->dns_addrs[0] >> 8; 3274 opt[i++] = sp->dns_addrs[0]; 3275 } 3276 if (sp->query_dns & 2) { 3277 opt[i++] = IPCP_OPT_SECDNS; 3278 opt[i++] = 6; 3279 opt[i++] = sp->dns_addrs[1] >> 24; 3280 opt[i++] = sp->dns_addrs[1] >> 16; 3281 opt[i++] = sp->dns_addrs[1] >> 8; 3282 opt[i++] = sp->dns_addrs[1]; 3283 } 3284 3285 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3286 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3287 } 3288 3289 3290 /* 3291 *--------------------------------------------------------------------------* 3292 * * 3293 * The IPv6CP implementation. * 3294 * * 3295 *--------------------------------------------------------------------------* 3296 */ 3297 3298 #ifdef INET6 3299 static void 3300 sppp_ipv6cp_init(struct sppp *sp) 3301 { 3302 sp->ipv6cp.opts = 0; 3303 sp->ipv6cp.flags = 0; 3304 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3305 sp->fail_counter[IDX_IPV6CP] = 0; 3306 sp->pp_seq[IDX_IPV6CP] = 0; 3307 sp->pp_rseq[IDX_IPV6CP] = 0; 3308 callout_init(&sp->ch[IDX_IPV6CP]); 3309 } 3310 3311 static void 3312 sppp_ipv6cp_up(struct sppp *sp) 3313 { 3314 sppp_up_event(&ipv6cp, sp); 3315 } 3316 3317 static void 3318 sppp_ipv6cp_down(struct sppp *sp) 3319 { 3320 sppp_down_event(&ipv6cp, sp); 3321 } 3322 3323 static void 3324 sppp_ipv6cp_open(struct sppp *sp) 3325 { 3326 STDDCL; 3327 struct in6_addr myaddr, hisaddr; 3328 3329 #ifdef IPV6CP_MYIFID_DYN 3330 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3331 #else 3332 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3333 #endif 3334 3335 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3336 /* 3337 * If we don't have our address, this probably means our 3338 * interface doesn't want to talk IPv6 at all. (This could 3339 * be the case if somebody wants to speak only IPX, for 3340 * example.) Don't open IPv6CP in this case. 3341 */ 3342 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3343 /* XXX this message should go away */ 3344 if (debug) 3345 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3346 ifp->if_xname); 3347 return; 3348 } 3349 3350 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3351 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3352 sppp_open_event(&ipv6cp, sp); 3353 } 3354 3355 static void 3356 sppp_ipv6cp_close(struct sppp *sp) 3357 { 3358 sppp_close_event(&ipv6cp, sp); 3359 } 3360 3361 static void 3362 sppp_ipv6cp_TO(void *cookie) 3363 { 3364 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3365 } 3366 3367 /* 3368 * Analyze a configure request. Return true if it was agreeable, and 3369 * caused action sca, false if it has been rejected or nak'ed, and 3370 * caused action scn. (The return value is used to make the state 3371 * transition decision in the state automaton.) 3372 */ 3373 static int 3374 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3375 { 3376 u_char *buf, *r, *p; 3377 struct ifnet *ifp = &sp->pp_if; 3378 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3379 struct in6_addr myaddr, desiredaddr, suggestaddr; 3380 int ifidcount; 3381 int type; 3382 int collision, nohisaddr; 3383 3384 len -= 4; 3385 origlen = len; 3386 /* 3387 * Make sure to allocate a buf that can at least hold a 3388 * conf-nak with an `address' option. We might need it below. 3389 */ 3390 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3391 if (! buf) 3392 return (0); 3393 3394 /* pass 1: see if we can recognize them */ 3395 if (debug) 3396 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3397 ifp->if_xname); 3398 p = (void *)(h + 1); 3399 ifidcount = 0; 3400 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3401 /* Sanity check option length */ 3402 if (p[1] > len) { 3403 /* XXX just RXJ? */ 3404 addlog("%s: received malicious IPCPv6 option, " 3405 "dropping\n", ifp->if_xname); 3406 goto drop; 3407 } 3408 if (debug) 3409 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3410 switch (*p) { 3411 case IPV6CP_OPT_IFID: 3412 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3413 /* correctly formed address option */ 3414 ifidcount++; 3415 continue; 3416 } 3417 if (debug) 3418 addlog(" [invalid]"); 3419 break; 3420 #ifdef notyet 3421 case IPV6CP_OPT_COMPRESSION: 3422 if (len >= 4 && p[1] >= 4) { 3423 /* correctly formed compress option */ 3424 continue; 3425 } 3426 if (debug) 3427 addlog(" [invalid]"); 3428 break; 3429 #endif 3430 default: 3431 /* Others not supported. */ 3432 if (debug) 3433 addlog(" [rej]"); 3434 break; 3435 } 3436 /* Add the option to rejected list. */ 3437 bcopy (p, r, p[1]); 3438 r += p[1]; 3439 rlen += p[1]; 3440 } 3441 if (rlen) { 3442 if (debug) 3443 addlog(" send conf-rej\n"); 3444 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3445 goto end; 3446 } else if (debug) 3447 addlog("\n"); 3448 3449 /* pass 2: parse option values */ 3450 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3451 if (debug) 3452 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3453 ifp->if_xname); 3454 p = (void *)(h + 1); 3455 len = origlen; 3456 type = CONF_ACK; 3457 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3458 if (debug) 3459 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3460 switch (*p) { 3461 #ifdef notyet 3462 case IPV6CP_OPT_COMPRESSION: 3463 continue; 3464 #endif 3465 case IPV6CP_OPT_IFID: 3466 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3467 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3468 collision = (memcmp(&desiredaddr.s6_addr[8], 3469 &myaddr.s6_addr[8], 8) == 0); 3470 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3471 3472 desiredaddr.s6_addr16[0] = htons(0xfe80); 3473 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3474 3475 if (!collision && !nohisaddr) { 3476 /* no collision, hisaddr known - Conf-Ack */ 3477 type = CONF_ACK; 3478 3479 if (debug) { 3480 addlog(" %s [%s]", 3481 ip6_sprintf(&desiredaddr), 3482 sppp_cp_type_name(type)); 3483 } 3484 continue; 3485 } 3486 3487 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3488 if (collision && nohisaddr) { 3489 /* collision, hisaddr unknown - Conf-Rej */ 3490 type = CONF_REJ; 3491 memset(&p[2], 0, 8); 3492 } else { 3493 /* 3494 * - no collision, hisaddr unknown, or 3495 * - collision, hisaddr known 3496 * Conf-Nak, suggest hisaddr 3497 */ 3498 type = CONF_NAK; 3499 sppp_suggest_ip6_addr(sp, &suggestaddr); 3500 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3501 } 3502 if (debug) 3503 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3504 sppp_cp_type_name(type)); 3505 break; 3506 } 3507 /* Add the option to nak'ed list. */ 3508 bcopy (p, r, p[1]); 3509 r += p[1]; 3510 rlen += p[1]; 3511 } 3512 3513 if (rlen == 0 && type == CONF_ACK) { 3514 if (debug) 3515 addlog(" send %s\n", sppp_cp_type_name(type)); 3516 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3517 } else { 3518 #ifdef notdef 3519 if (type == CONF_ACK) 3520 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3521 #endif 3522 3523 if (debug) { 3524 addlog(" send %s suggest %s\n", 3525 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3526 } 3527 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3528 } 3529 3530 end: 3531 free(buf, M_TEMP); 3532 return (rlen == 0); 3533 3534 drop: 3535 free(buf, M_TEMP); 3536 return -1; 3537 } 3538 3539 /* 3540 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3541 * negotiation. 3542 */ 3543 static void 3544 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3545 { 3546 u_char *buf, *p; 3547 struct ifnet *ifp = &sp->pp_if; 3548 int debug = ifp->if_flags & IFF_DEBUG; 3549 3550 len -= 4; 3551 buf = malloc (len, M_TEMP, M_NOWAIT); 3552 if (!buf) 3553 return; 3554 3555 if (debug) 3556 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3557 ifp->if_xname); 3558 3559 p = (void *)(h + 1); 3560 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3561 if (p[1] > len) { 3562 /* XXX just RXJ? */ 3563 addlog("%s: received malicious IPCPv6 option, " 3564 "dropping\n", ifp->if_xname); 3565 goto drop; 3566 } 3567 if (debug) 3568 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3569 switch (*p) { 3570 case IPV6CP_OPT_IFID: 3571 /* 3572 * Peer doesn't grok address option. This is 3573 * bad. XXX Should we better give up here? 3574 */ 3575 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3576 break; 3577 #ifdef notyet 3578 case IPV6CP_OPT_COMPRESS: 3579 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3580 break; 3581 #endif 3582 } 3583 } 3584 if (debug) 3585 addlog("\n"); 3586 drop: 3587 free(buf, M_TEMP); 3588 return; 3589 } 3590 3591 /* 3592 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3593 * negotiation. 3594 */ 3595 static void 3596 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3597 { 3598 u_char *buf, *p; 3599 struct ifnet *ifp = &sp->pp_if; 3600 int debug = ifp->if_flags & IFF_DEBUG; 3601 struct in6_addr suggestaddr; 3602 3603 len -= 4; 3604 buf = malloc (len, M_TEMP, M_NOWAIT); 3605 if (!buf) 3606 return; 3607 3608 if (debug) 3609 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3610 ifp->if_xname); 3611 3612 p = (void *)(h + 1); 3613 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3614 if (p[1] > len) { 3615 /* XXX just RXJ? */ 3616 addlog("%s: received malicious IPCPv6 option, " 3617 "dropping\n", ifp->if_xname); 3618 goto drop; 3619 } 3620 if (debug) 3621 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3622 switch (*p) { 3623 case IPV6CP_OPT_IFID: 3624 /* 3625 * Peer doesn't like our local ifid. See 3626 * if we can do something for him. We'll drop 3627 * him our address then. 3628 */ 3629 if (len < 10 || p[1] != 10) 3630 break; 3631 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3632 suggestaddr.s6_addr16[0] = htons(0xfe80); 3633 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3634 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3635 3636 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3637 if (debug) 3638 addlog(" [suggestaddr %s]", 3639 ip6_sprintf(&suggestaddr)); 3640 #ifdef IPV6CP_MYIFID_DYN 3641 /* 3642 * When doing dynamic address assignment, 3643 * we accept his offer. 3644 */ 3645 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3646 struct in6_addr lastsuggest; 3647 /* 3648 * If <suggested myaddr from peer> equals to 3649 * <hisaddr we have suggested last time>, 3650 * we have a collision. generate new random 3651 * ifid. 3652 */ 3653 sppp_suggest_ip6_addr(&lastsuggest); 3654 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3655 lastsuggest)) { 3656 if (debug) 3657 addlog(" [random]"); 3658 sppp_gen_ip6_addr(sp, &suggestaddr); 3659 } 3660 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3661 if (debug) 3662 addlog(" [agree]"); 3663 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3664 } 3665 #else 3666 /* 3667 * Since we do not do dynamic address assignment, 3668 * we ignore it and thus continue to negotiate 3669 * our already existing value. This can possibly 3670 * go into infinite request-reject loop. 3671 * 3672 * This is not likely because we normally use 3673 * ifid based on MAC-address. 3674 * If you have no ethernet card on the node, too bad. 3675 * XXX should we use fail_counter? 3676 */ 3677 #endif 3678 break; 3679 #ifdef notyet 3680 case IPV6CP_OPT_COMPRESS: 3681 /* 3682 * Peer wants different compression parameters. 3683 */ 3684 break; 3685 #endif 3686 } 3687 } 3688 if (debug) 3689 addlog("\n"); 3690 drop: 3691 free(buf, M_TEMP); 3692 return; 3693 } 3694 3695 static void 3696 sppp_ipv6cp_tlu(struct sppp *sp) 3697 { 3698 /* we are up - notify isdn daemon */ 3699 if (sp->pp_con) 3700 sp->pp_con(sp); 3701 } 3702 3703 static void 3704 sppp_ipv6cp_tld(struct sppp *sp) 3705 { 3706 } 3707 3708 static void 3709 sppp_ipv6cp_tls(struct sppp *sp) 3710 { 3711 /* indicate to LCP that it must stay alive */ 3712 sp->lcp.protos |= (1 << IDX_IPV6CP); 3713 } 3714 3715 static void 3716 sppp_ipv6cp_tlf(struct sppp *sp) 3717 { 3718 /* we no longer need LCP */ 3719 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3720 } 3721 3722 static void 3723 sppp_ipv6cp_scr(struct sppp *sp) 3724 { 3725 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3726 struct in6_addr ouraddr; 3727 int i = 0; 3728 3729 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3730 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3731 opt[i++] = IPV6CP_OPT_IFID; 3732 opt[i++] = 10; 3733 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3734 i += 8; 3735 } 3736 3737 #ifdef notyet 3738 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3739 opt[i++] = IPV6CP_OPT_COMPRESSION; 3740 opt[i++] = 4; 3741 opt[i++] = 0; /* TBD */ 3742 opt[i++] = 0; /* TBD */ 3743 /* variable length data may follow */ 3744 } 3745 #endif 3746 3747 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3748 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3749 } 3750 #else /*INET6*/ 3751 static void sppp_ipv6cp_init(struct sppp *sp) 3752 { 3753 } 3754 3755 static void sppp_ipv6cp_up(struct sppp *sp) 3756 { 3757 } 3758 3759 static void sppp_ipv6cp_down(struct sppp *sp) 3760 { 3761 } 3762 3763 3764 static void sppp_ipv6cp_open(struct sppp *sp) 3765 { 3766 } 3767 3768 static void sppp_ipv6cp_close(struct sppp *sp) 3769 { 3770 } 3771 3772 static void sppp_ipv6cp_TO(void *sp) 3773 { 3774 } 3775 3776 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3777 { 3778 return 0; 3779 } 3780 3781 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3782 { 3783 } 3784 3785 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3786 { 3787 } 3788 3789 static void sppp_ipv6cp_tlu(struct sppp *sp) 3790 { 3791 } 3792 3793 static void sppp_ipv6cp_tld(struct sppp *sp) 3794 { 3795 } 3796 3797 static void sppp_ipv6cp_tls(struct sppp *sp) 3798 { 3799 } 3800 3801 static void sppp_ipv6cp_tlf(struct sppp *sp) 3802 { 3803 } 3804 3805 static void sppp_ipv6cp_scr(struct sppp *sp) 3806 { 3807 } 3808 #endif /*INET6*/ 3809 3810 3811 /* 3812 *--------------------------------------------------------------------------* 3813 * * 3814 * The CHAP implementation. * 3815 * * 3816 *--------------------------------------------------------------------------* 3817 */ 3818 3819 /* 3820 * The authentication protocols don't employ a full-fledged state machine as 3821 * the control protocols do, since they do have Open and Close events, but 3822 * not Up and Down, nor are they explicitly terminated. Also, use of the 3823 * authentication protocols may be different in both directions (this makes 3824 * sense, think of a machine that never accepts incoming calls but only 3825 * calls out, it doesn't require the called party to authenticate itself). 3826 * 3827 * Our state machine for the local authentication protocol (we are requesting 3828 * the peer to authenticate) looks like: 3829 * 3830 * RCA- 3831 * +--------------------------------------------+ 3832 * V scn,tld| 3833 * +--------+ Close +---------+ RCA+ 3834 * | |<----------------------------------| |------+ 3835 * +--->| Closed | TO* | Opened | sca | 3836 * | | |-----+ +-------| |<-----+ 3837 * | +--------+ irc | | +---------+ 3838 * | ^ | | ^ 3839 * | | | | | 3840 * | | | | | 3841 * | TO-| | | | 3842 * | |tld TO+ V | | 3843 * | | +------->+ | | 3844 * | | | | | | 3845 * | +--------+ V | | 3846 * | | |<----+<--------------------+ | 3847 * | | Req- | scr | 3848 * | | Sent | | 3849 * | | | | 3850 * | +--------+ | 3851 * | RCA- | | RCA+ | 3852 * +------+ +------------------------------------------+ 3853 * scn,tld sca,irc,ict,tlu 3854 * 3855 * 3856 * with: 3857 * 3858 * Open: LCP reached authentication phase 3859 * Close: LCP reached terminate phase 3860 * 3861 * RCA+: received reply (pap-req, chap-response), acceptable 3862 * RCN: received reply (pap-req, chap-response), not acceptable 3863 * TO+: timeout with restart counter >= 0 3864 * TO-: timeout with restart counter < 0 3865 * TO*: reschedule timeout for CHAP 3866 * 3867 * scr: send request packet (none for PAP, chap-challenge) 3868 * sca: send ack packet (pap-ack, chap-success) 3869 * scn: send nak packet (pap-nak, chap-failure) 3870 * ict: initialize re-challenge timer (CHAP only) 3871 * 3872 * tlu: this-layer-up, LCP reaches network phase 3873 * tld: this-layer-down, LCP enters terminate phase 3874 * 3875 * Note that in CHAP mode, after sending a new challenge, while the state 3876 * automaton falls back into Req-Sent state, it doesn't signal a tld 3877 * event to LCP, so LCP remains in network phase. Only after not getting 3878 * any response (or after getting an unacceptable response), CHAP closes, 3879 * causing LCP to enter terminate phase. 3880 * 3881 * With PAP, there is no initial request that can be sent. The peer is 3882 * expected to send one based on the successful negotiation of PAP as 3883 * the authentication protocol during the LCP option negotiation. 3884 * 3885 * Incoming authentication protocol requests (remote requests 3886 * authentication, we are peer) don't employ a state machine at all, 3887 * they are simply answered. Some peers [Ascend P50 firmware rev 3888 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3889 * still in authentication phase (thereby violating the standard that 3890 * demands that these NCP packets are to be discarded), so we keep 3891 * track of the peer demanding us to authenticate, and only proceed to 3892 * phase network once we've seen a positive acknowledge for the 3893 * authentication. 3894 */ 3895 3896 /* 3897 * Handle incoming CHAP packets. 3898 */ 3899 void 3900 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3901 { 3902 STDDCL; 3903 struct lcp_header *h; 3904 int len, x; 3905 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3906 int value_len, name_len; 3907 MD5_CTX ctx; 3908 3909 len = m->m_pkthdr.len; 3910 if (len < 4) { 3911 if (debug) 3912 log(LOG_DEBUG, 3913 "%s: chap invalid packet length: %d bytes\n", 3914 ifp->if_xname, len); 3915 return; 3916 } 3917 h = mtod(m, struct lcp_header *); 3918 if (len > ntohs(h->len)) 3919 len = ntohs(h->len); 3920 3921 switch (h->type) { 3922 /* challenge, failure and success are his authproto */ 3923 case CHAP_CHALLENGE: 3924 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3925 /* can't do anything usefull */ 3926 sp->pp_auth_failures++; 3927 printf("%s: chap input without my name and my secret being set\n", 3928 ifp->if_xname); 3929 break; 3930 } 3931 value = 1 + (u_char *)(h + 1); 3932 value_len = value[-1]; 3933 name = value + value_len; 3934 name_len = len - value_len - 5; 3935 if (name_len < 0) { 3936 if (debug) { 3937 log(LOG_DEBUG, 3938 "%s: chap corrupted challenge " 3939 "<%s id=0x%x len=%d", 3940 ifp->if_xname, 3941 sppp_auth_type_name(PPP_CHAP, h->type), 3942 h->ident, ntohs(h->len)); 3943 if (len > 4) 3944 sppp_print_bytes((u_char *)(h + 1), 3945 len - 4); 3946 addlog(">\n"); 3947 } 3948 break; 3949 } 3950 3951 if (debug) { 3952 log(LOG_DEBUG, 3953 "%s: chap input <%s id=0x%x len=%d name=", 3954 ifp->if_xname, 3955 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3956 ntohs(h->len)); 3957 sppp_print_string((char *) name, name_len); 3958 addlog(" value-size=%d value=", value_len); 3959 sppp_print_bytes(value, value_len); 3960 addlog(">\n"); 3961 } 3962 3963 /* Compute reply value. */ 3964 MD5Init(&ctx); 3965 MD5Update(&ctx, &h->ident, 1); 3966 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3967 MD5Update(&ctx, value, value_len); 3968 MD5Final(digest, &ctx); 3969 dsize = sizeof digest; 3970 3971 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3972 sizeof dsize, (const char *)&dsize, 3973 sizeof digest, digest, 3974 sp->myauth.name_len, 3975 sp->myauth.name, 3976 0); 3977 break; 3978 3979 case CHAP_SUCCESS: 3980 if (debug) { 3981 log(LOG_DEBUG, "%s: chap success", 3982 ifp->if_xname); 3983 if (len > 4) { 3984 addlog(": "); 3985 sppp_print_string((char *)(h + 1), len - 4); 3986 } 3987 addlog("\n"); 3988 } 3989 x = splnet(); 3990 sp->pp_auth_failures = 0; 3991 sp->pp_flags &= ~PP_NEEDAUTH; 3992 if (sp->myauth.proto == PPP_CHAP && 3993 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3994 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3995 /* 3996 * We are authenticator for CHAP but didn't 3997 * complete yet. Leave it to tlu to proceed 3998 * to network phase. 3999 */ 4000 splx(x); 4001 break; 4002 } 4003 splx(x); 4004 sppp_phase_network(sp); 4005 break; 4006 4007 case CHAP_FAILURE: 4008 x = splnet(); 4009 sp->pp_auth_failures++; 4010 splx(x); 4011 if (debug) { 4012 log(LOG_INFO, "%s: chap failure", 4013 ifp->if_xname); 4014 if (len > 4) { 4015 addlog(": "); 4016 sppp_print_string((char *)(h + 1), len - 4); 4017 } 4018 addlog("\n"); 4019 } else 4020 log(LOG_INFO, "%s: chap failure\n", 4021 ifp->if_xname); 4022 /* await LCP shutdown by authenticator */ 4023 break; 4024 4025 /* response is my authproto */ 4026 case CHAP_RESPONSE: 4027 if (sp->hisauth.secret == NULL) { 4028 /* can't do anything usefull */ 4029 printf("%s: chap input without his secret being set\n", 4030 ifp->if_xname); 4031 break; 4032 } 4033 value = 1 + (u_char *)(h + 1); 4034 value_len = value[-1]; 4035 name = value + value_len; 4036 name_len = len - value_len - 5; 4037 if (name_len < 0) { 4038 if (debug) { 4039 log(LOG_DEBUG, 4040 "%s: chap corrupted response " 4041 "<%s id=0x%x len=%d", 4042 ifp->if_xname, 4043 sppp_auth_type_name(PPP_CHAP, h->type), 4044 h->ident, ntohs(h->len)); 4045 if (len > 4) 4046 sppp_print_bytes((u_char *)(h + 1), 4047 len - 4); 4048 addlog(">\n"); 4049 } 4050 break; 4051 } 4052 if (h->ident != sp->confid[IDX_CHAP]) { 4053 if (debug) 4054 log(LOG_DEBUG, 4055 "%s: chap dropping response for old ID " 4056 "(got %d, expected %d)\n", 4057 ifp->if_xname, 4058 h->ident, sp->confid[IDX_CHAP]); 4059 break; 4060 } 4061 if (sp->hisauth.name != NULL && 4062 (name_len != sp->hisauth.name_len 4063 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4064 log(LOG_INFO, "%s: chap response, his name ", 4065 ifp->if_xname); 4066 sppp_print_string(name, name_len); 4067 addlog(" != expected "); 4068 sppp_print_string(sp->hisauth.name, 4069 sp->hisauth.name_len); 4070 addlog("\n"); 4071 goto chap_failure; 4072 } 4073 if (debug) { 4074 log(LOG_DEBUG, "%s: chap input(%s) " 4075 "<%s id=0x%x len=%d name=", 4076 ifp->if_xname, 4077 sppp_state_name(sp->state[IDX_CHAP]), 4078 sppp_auth_type_name(PPP_CHAP, h->type), 4079 h->ident, ntohs(h->len)); 4080 sppp_print_string((char *)name, name_len); 4081 addlog(" value-size=%d value=", value_len); 4082 sppp_print_bytes(value, value_len); 4083 addlog(">\n"); 4084 } 4085 if (value_len != sizeof(sp->myauth.challenge)) { 4086 if (debug) 4087 log(LOG_DEBUG, 4088 "%s: chap bad hash value length: " 4089 "%d bytes, should be %ld\n", 4090 ifp->if_xname, value_len, 4091 (long) sizeof(sp->myauth.challenge)); 4092 goto chap_failure; 4093 } 4094 4095 MD5Init(&ctx); 4096 MD5Update(&ctx, &h->ident, 1); 4097 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4098 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4099 MD5Final(digest, &ctx); 4100 4101 #define FAILMSG "Failed..." 4102 #define SUCCMSG "Welcome!" 4103 4104 if (value_len != sizeof digest || 4105 memcmp(digest, value, value_len) != 0) { 4106 chap_failure: 4107 /* action scn, tld */ 4108 x = splnet(); 4109 sp->pp_auth_failures++; 4110 splx(x); 4111 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4112 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4113 0); 4114 chap.tld(sp); 4115 break; 4116 } 4117 sp->pp_auth_failures = 0; 4118 /* action sca, perhaps tlu */ 4119 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4120 sp->state[IDX_CHAP] == STATE_OPENED) 4121 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4122 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4123 0); 4124 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4125 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4126 chap.tlu(sp); 4127 } 4128 break; 4129 4130 default: 4131 /* Unknown CHAP packet type -- ignore. */ 4132 if (debug) { 4133 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4134 "<0x%x id=0x%xh len=%d", 4135 ifp->if_xname, 4136 sppp_state_name(sp->state[IDX_CHAP]), 4137 h->type, h->ident, ntohs(h->len)); 4138 if (len > 4) 4139 sppp_print_bytes((u_char *)(h + 1), len - 4); 4140 addlog(">\n"); 4141 } 4142 break; 4143 4144 } 4145 } 4146 4147 static void 4148 sppp_chap_init(struct sppp *sp) 4149 { 4150 /* Chap doesn't have STATE_INITIAL at all. */ 4151 sp->state[IDX_CHAP] = STATE_CLOSED; 4152 sp->fail_counter[IDX_CHAP] = 0; 4153 sp->pp_seq[IDX_CHAP] = 0; 4154 sp->pp_rseq[IDX_CHAP] = 0; 4155 callout_init(&sp->ch[IDX_CHAP]); 4156 } 4157 4158 static void 4159 sppp_chap_open(struct sppp *sp) 4160 { 4161 if (sp->myauth.proto == PPP_CHAP && 4162 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4163 /* we are authenticator for CHAP, start it */ 4164 chap.scr(sp); 4165 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4166 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4167 } 4168 /* nothing to be done if we are peer, await a challenge */ 4169 } 4170 4171 static void 4172 sppp_chap_close(struct sppp *sp) 4173 { 4174 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4175 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4176 } 4177 4178 static void 4179 sppp_chap_TO(void *cookie) 4180 { 4181 struct sppp *sp = (struct sppp *)cookie; 4182 STDDCL; 4183 int s; 4184 4185 s = splnet(); 4186 if (debug) 4187 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4188 ifp->if_xname, 4189 sppp_state_name(sp->state[IDX_CHAP]), 4190 sp->rst_counter[IDX_CHAP]); 4191 4192 if (--sp->rst_counter[IDX_CHAP] < 0) 4193 /* TO- event */ 4194 switch (sp->state[IDX_CHAP]) { 4195 case STATE_REQ_SENT: 4196 chap.tld(sp); 4197 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4198 break; 4199 } 4200 else 4201 /* TO+ (or TO*) event */ 4202 switch (sp->state[IDX_CHAP]) { 4203 case STATE_OPENED: 4204 /* TO* event */ 4205 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4206 /* fall through */ 4207 case STATE_REQ_SENT: 4208 chap.scr(sp); 4209 /* sppp_cp_change_state() will restart the timer */ 4210 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4211 break; 4212 } 4213 4214 splx(s); 4215 } 4216 4217 static void 4218 sppp_chap_tlu(struct sppp *sp) 4219 { 4220 STDDCL; 4221 int i, x; 4222 4223 i = 0; 4224 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4225 4226 /* 4227 * Some broken CHAP implementations (Conware CoNet, firmware 4228 * 4.0.?) don't want to re-authenticate their CHAP once the 4229 * initial challenge-response exchange has taken place. 4230 * Provide for an option to avoid rechallenges. 4231 */ 4232 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4233 /* 4234 * Compute the re-challenge timeout. This will yield 4235 * a number between 300 and 810 seconds. 4236 */ 4237 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4238 4239 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4240 } 4241 4242 if (debug) { 4243 log(LOG_DEBUG, 4244 "%s: chap %s, ", 4245 ifp->if_xname, 4246 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4247 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4248 addlog("next re-challenge in %d seconds\n", i); 4249 else 4250 addlog("re-challenging supressed\n"); 4251 } 4252 4253 x = splnet(); 4254 sp->pp_auth_failures = 0; 4255 /* indicate to LCP that we need to be closed down */ 4256 sp->lcp.protos |= (1 << IDX_CHAP); 4257 4258 if (sp->pp_flags & PP_NEEDAUTH) { 4259 /* 4260 * Remote is authenticator, but his auth proto didn't 4261 * complete yet. Defer the transition to network 4262 * phase. 4263 */ 4264 splx(x); 4265 return; 4266 } 4267 splx(x); 4268 4269 /* 4270 * If we are already in phase network, we are done here. This 4271 * is the case if this is a dummy tlu event after a re-challenge. 4272 */ 4273 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4274 sppp_phase_network(sp); 4275 } 4276 4277 static void 4278 sppp_chap_tld(struct sppp *sp) 4279 { 4280 STDDCL; 4281 4282 if (debug) 4283 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4284 callout_stop(&sp->ch[IDX_CHAP]); 4285 sp->lcp.protos &= ~(1 << IDX_CHAP); 4286 4287 lcp.Close(sp); 4288 } 4289 4290 static void 4291 sppp_chap_scr(struct sppp *sp) 4292 { 4293 u_int32_t *ch; 4294 u_char clen; 4295 4296 if (sp->myauth.name == NULL) { 4297 /* can't do anything usefull */ 4298 printf("%s: chap starting without my name being set\n", 4299 sp->pp_if.if_xname); 4300 return; 4301 } 4302 4303 /* Compute random challenge. */ 4304 ch = (u_int32_t *)sp->myauth.challenge; 4305 ch[0] = arc4random(); 4306 ch[1] = arc4random(); 4307 ch[2] = arc4random(); 4308 ch[3] = arc4random(); 4309 clen = 16; /* 4 * sizeof(u_int32_t) */ 4310 4311 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4312 4313 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4314 sizeof clen, (const char *)&clen, 4315 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4316 sp->myauth.name_len, 4317 sp->myauth.name, 4318 0); 4319 } 4320 4321 /* 4322 *--------------------------------------------------------------------------* 4323 * * 4324 * The PAP implementation. * 4325 * * 4326 *--------------------------------------------------------------------------* 4327 */ 4328 /* 4329 * For PAP, we need to keep a little state also if we are the peer, not the 4330 * authenticator. This is since we don't get a request to authenticate, but 4331 * have to repeatedly authenticate ourself until we got a response (or the 4332 * retry counter is expired). 4333 */ 4334 4335 /* 4336 * Handle incoming PAP packets. */ 4337 static void 4338 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4339 { 4340 STDDCL; 4341 struct lcp_header *h; 4342 int len, x; 4343 u_char mlen; 4344 char *name, *secret; 4345 int name_len, secret_len; 4346 4347 /* 4348 * Malicious input might leave this uninitialized, so 4349 * init to an impossible value. 4350 */ 4351 secret_len = -1; 4352 4353 len = m->m_pkthdr.len; 4354 if (len < 5) { 4355 if (debug) 4356 log(LOG_DEBUG, 4357 "%s: pap invalid packet length: %d bytes\n", 4358 ifp->if_xname, len); 4359 return; 4360 } 4361 h = mtod(m, struct lcp_header *); 4362 if (len > ntohs(h->len)) 4363 len = ntohs(h->len); 4364 switch (h->type) { 4365 /* PAP request is my authproto */ 4366 case PAP_REQ: 4367 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4368 /* can't do anything usefull */ 4369 printf("%s: pap request without his name and his secret being set\n", 4370 ifp->if_xname); 4371 break; 4372 } 4373 name = 1 + (u_char *)(h + 1); 4374 name_len = name[-1]; 4375 secret = name + name_len + 1; 4376 if (name_len > len - 6 || 4377 (secret_len = secret[-1]) > len - 6 - name_len) { 4378 if (debug) { 4379 log(LOG_DEBUG, "%s: pap corrupted input " 4380 "<%s id=0x%x len=%d", 4381 ifp->if_xname, 4382 sppp_auth_type_name(PPP_PAP, h->type), 4383 h->ident, ntohs(h->len)); 4384 if (len > 4) 4385 sppp_print_bytes((u_char *)(h + 1), 4386 len - 4); 4387 addlog(">\n"); 4388 } 4389 break; 4390 } 4391 if (debug) { 4392 log(LOG_DEBUG, "%s: pap input(%s) " 4393 "<%s id=0x%x len=%d name=", 4394 ifp->if_xname, 4395 sppp_state_name(sp->state[IDX_PAP]), 4396 sppp_auth_type_name(PPP_PAP, h->type), 4397 h->ident, ntohs(h->len)); 4398 sppp_print_string((char *)name, name_len); 4399 addlog(" secret="); 4400 sppp_print_string((char *)secret, secret_len); 4401 addlog(">\n"); 4402 } 4403 if (name_len != sp->hisauth.name_len || 4404 secret_len != sp->hisauth.secret_len || 4405 memcmp(name, sp->hisauth.name, name_len) != 0 || 4406 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4407 /* action scn, tld */ 4408 sp->pp_auth_failures++; 4409 mlen = sizeof(FAILMSG) - 1; 4410 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4411 sizeof mlen, (const char *)&mlen, 4412 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4413 0); 4414 pap.tld(sp); 4415 break; 4416 } 4417 /* action sca, perhaps tlu */ 4418 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4419 sp->state[IDX_PAP] == STATE_OPENED) { 4420 mlen = sizeof(SUCCMSG) - 1; 4421 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4422 sizeof mlen, (const char *)&mlen, 4423 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4424 0); 4425 } 4426 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4427 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4428 pap.tlu(sp); 4429 } 4430 break; 4431 4432 /* ack and nak are his authproto */ 4433 case PAP_ACK: 4434 callout_stop(&sp->pap_my_to_ch); 4435 if (debug) { 4436 log(LOG_DEBUG, "%s: pap success", 4437 ifp->if_xname); 4438 name = 1 + (u_char *)(h + 1); 4439 name_len = name[-1]; 4440 if (len > 5 && name_len < len+4) { 4441 addlog(": "); 4442 sppp_print_string(name, name_len); 4443 } 4444 addlog("\n"); 4445 } 4446 x = splnet(); 4447 sp->pp_auth_failures = 0; 4448 sp->pp_flags &= ~PP_NEEDAUTH; 4449 if (sp->myauth.proto == PPP_PAP && 4450 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4451 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4452 /* 4453 * We are authenticator for PAP but didn't 4454 * complete yet. Leave it to tlu to proceed 4455 * to network phase. 4456 */ 4457 splx(x); 4458 break; 4459 } 4460 splx(x); 4461 sppp_phase_network(sp); 4462 break; 4463 4464 case PAP_NAK: 4465 callout_stop(&sp->pap_my_to_ch); 4466 sp->pp_auth_failures++; 4467 if (debug) { 4468 log(LOG_INFO, "%s: pap failure", 4469 ifp->if_xname); 4470 name = 1 + (u_char *)(h + 1); 4471 name_len = name[-1]; 4472 if (len > 5 && name_len < len+4) { 4473 addlog(": "); 4474 sppp_print_string(name, name_len); 4475 } 4476 addlog("\n"); 4477 } else 4478 log(LOG_INFO, "%s: pap failure\n", 4479 ifp->if_xname); 4480 /* await LCP shutdown by authenticator */ 4481 break; 4482 4483 default: 4484 /* Unknown PAP packet type -- ignore. */ 4485 if (debug) { 4486 log(LOG_DEBUG, "%s: pap corrupted input " 4487 "<0x%x id=0x%x len=%d", 4488 ifp->if_xname, 4489 h->type, h->ident, ntohs(h->len)); 4490 if (len > 4) 4491 sppp_print_bytes((u_char *)(h + 1), len - 4); 4492 addlog(">\n"); 4493 } 4494 break; 4495 4496 } 4497 } 4498 4499 static void 4500 sppp_pap_init(struct sppp *sp) 4501 { 4502 /* PAP doesn't have STATE_INITIAL at all. */ 4503 sp->state[IDX_PAP] = STATE_CLOSED; 4504 sp->fail_counter[IDX_PAP] = 0; 4505 sp->pp_seq[IDX_PAP] = 0; 4506 sp->pp_rseq[IDX_PAP] = 0; 4507 callout_init(&sp->ch[IDX_PAP]); 4508 callout_init(&sp->pap_my_to_ch); 4509 } 4510 4511 static void 4512 sppp_pap_open(struct sppp *sp) 4513 { 4514 if (sp->hisauth.proto == PPP_PAP && 4515 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4516 /* we are authenticator for PAP, start our timer */ 4517 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4518 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4519 } 4520 if (sp->myauth.proto == PPP_PAP) { 4521 /* we are peer, send a request, and start a timer */ 4522 pap.scr(sp); 4523 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4524 sppp_pap_my_TO, sp); 4525 } 4526 } 4527 4528 static void 4529 sppp_pap_close(struct sppp *sp) 4530 { 4531 if (sp->state[IDX_PAP] != STATE_CLOSED) 4532 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4533 } 4534 4535 /* 4536 * That's the timeout routine if we are authenticator. Since the 4537 * authenticator is basically passive in PAP, we can't do much here. 4538 */ 4539 static void 4540 sppp_pap_TO(void *cookie) 4541 { 4542 struct sppp *sp = (struct sppp *)cookie; 4543 STDDCL; 4544 int s; 4545 4546 s = splnet(); 4547 if (debug) 4548 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4549 ifp->if_xname, 4550 sppp_state_name(sp->state[IDX_PAP]), 4551 sp->rst_counter[IDX_PAP]); 4552 4553 if (--sp->rst_counter[IDX_PAP] < 0) 4554 /* TO- event */ 4555 switch (sp->state[IDX_PAP]) { 4556 case STATE_REQ_SENT: 4557 pap.tld(sp); 4558 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4559 break; 4560 } 4561 else 4562 /* TO+ event, not very much we could do */ 4563 switch (sp->state[IDX_PAP]) { 4564 case STATE_REQ_SENT: 4565 /* sppp_cp_change_state() will restart the timer */ 4566 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4567 break; 4568 } 4569 4570 splx(s); 4571 } 4572 4573 /* 4574 * That's the timeout handler if we are peer. Since the peer is active, 4575 * we need to retransmit our PAP request since it is apparently lost. 4576 * XXX We should impose a max counter. 4577 */ 4578 static void 4579 sppp_pap_my_TO(void *cookie) 4580 { 4581 struct sppp *sp = (struct sppp *)cookie; 4582 STDDCL; 4583 4584 if (debug) 4585 log(LOG_DEBUG, "%s: pap peer TO\n", 4586 ifp->if_xname); 4587 4588 pap.scr(sp); 4589 } 4590 4591 static void 4592 sppp_pap_tlu(struct sppp *sp) 4593 { 4594 STDDCL; 4595 int x; 4596 4597 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4598 4599 if (debug) 4600 log(LOG_DEBUG, "%s: %s tlu\n", 4601 ifp->if_xname, pap.name); 4602 4603 x = splnet(); 4604 sp->pp_auth_failures = 0; 4605 /* indicate to LCP that we need to be closed down */ 4606 sp->lcp.protos |= (1 << IDX_PAP); 4607 4608 if (sp->pp_flags & PP_NEEDAUTH) { 4609 /* 4610 * Remote is authenticator, but his auth proto didn't 4611 * complete yet. Defer the transition to network 4612 * phase. 4613 */ 4614 splx(x); 4615 return; 4616 } 4617 splx(x); 4618 sppp_phase_network(sp); 4619 } 4620 4621 static void 4622 sppp_pap_tld(struct sppp *sp) 4623 { 4624 STDDCL; 4625 4626 if (debug) 4627 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4628 callout_stop(&sp->ch[IDX_PAP]); 4629 callout_stop(&sp->pap_my_to_ch); 4630 sp->lcp.protos &= ~(1 << IDX_PAP); 4631 4632 lcp.Close(sp); 4633 } 4634 4635 static void 4636 sppp_pap_scr(struct sppp *sp) 4637 { 4638 u_char idlen, pwdlen; 4639 4640 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4641 /* can't do anything usefull */ 4642 printf("%s: pap starting without my name and secret being set\n", 4643 sp->pp_if.if_xname); 4644 return; 4645 } 4646 4647 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4648 pwdlen = sp->myauth.secret_len; 4649 idlen = sp->myauth.name_len; 4650 4651 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4652 sizeof idlen, (const char *)&idlen, 4653 idlen, sp->myauth.name, 4654 sizeof pwdlen, (const char *)&pwdlen, 4655 pwdlen, sp->myauth.secret, 4656 0); 4657 } 4658 4659 /* 4660 * Random miscellaneous functions. 4661 */ 4662 4663 /* 4664 * Send a PAP or CHAP proto packet. 4665 * 4666 * Varadic function, each of the elements for the ellipsis is of type 4667 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4668 * mlen == 0. 4669 * NOTE: never declare variadic functions with types subject to type 4670 * promotion (i.e. u_char). This is asking for big trouble depending 4671 * on the architecture you are on... 4672 */ 4673 4674 static void 4675 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4676 unsigned int type, unsigned int id, 4677 ...) 4678 { 4679 STDDCL; 4680 struct lcp_header *lh; 4681 struct mbuf *m; 4682 u_char *p; 4683 int len; 4684 size_t pkthdrlen; 4685 unsigned int mlen; 4686 const char *msg; 4687 va_list ap; 4688 4689 MGETHDR(m, M_DONTWAIT, MT_DATA); 4690 if (! m) 4691 return; 4692 m->m_pkthdr.rcvif = 0; 4693 4694 if (sp->pp_flags & PP_NOFRAMING) { 4695 *mtod(m, u_int16_t *) = htons(cp->proto); 4696 pkthdrlen = 2; 4697 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4698 } else { 4699 struct ppp_header *h; 4700 h = mtod(m, struct ppp_header *); 4701 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4702 h->control = PPP_UI; /* Unnumbered Info */ 4703 h->protocol = htons(cp->proto); 4704 pkthdrlen = PPP_HEADER_LEN; 4705 4706 lh = (struct lcp_header *)(h + 1); 4707 } 4708 4709 lh->type = type; 4710 lh->ident = id; 4711 p = (u_char *)(lh + 1); 4712 4713 va_start(ap, id); 4714 len = 0; 4715 4716 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4717 msg = va_arg(ap, const char *); 4718 len += mlen; 4719 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4720 va_end(ap); 4721 m_freem(m); 4722 return; 4723 } 4724 4725 bcopy(msg, p, mlen); 4726 p += mlen; 4727 } 4728 va_end(ap); 4729 4730 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4731 lh->len = htons(LCP_HEADER_LEN + len); 4732 4733 if (debug) { 4734 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4735 ifp->if_xname, cp->name, 4736 sppp_auth_type_name(cp->proto, lh->type), 4737 lh->ident, ntohs(lh->len)); 4738 if (len) 4739 sppp_print_bytes((u_char *)(lh + 1), len); 4740 addlog(">\n"); 4741 } 4742 if (IF_QFULL(&sp->pp_cpq)) { 4743 IF_DROP(&sp->pp_fastq); 4744 IF_DROP(&ifp->if_snd); 4745 m_freem(m); 4746 ++ifp->if_oerrors; 4747 return; 4748 } else 4749 IF_ENQUEUE(&sp->pp_cpq, m); 4750 if (! (ifp->if_flags & IFF_OACTIVE)) 4751 (*ifp->if_start)(ifp); 4752 ifp->if_obytes += m->m_pkthdr.len + 3; 4753 } 4754 4755 /* 4756 * Send keepalive packets, every 10 seconds. 4757 */ 4758 static void 4759 sppp_keepalive(void *dummy) 4760 { 4761 struct sppp *sp; 4762 int s; 4763 time_t now; 4764 4765 s = splnet(); 4766 now = mono_time.tv_sec; 4767 for (sp=spppq; sp; sp=sp->pp_next) { 4768 struct ifnet *ifp = &sp->pp_if; 4769 4770 /* check idle timeout */ 4771 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4772 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4773 /* idle timeout is enabled for this interface */ 4774 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4775 if (ifp->if_flags & IFF_DEBUG) 4776 printf("%s: no activitiy for %lu seconds\n", 4777 sp->pp_if.if_xname, 4778 (unsigned long)(now-sp->pp_last_activity)); 4779 lcp.Close(sp); 4780 continue; 4781 } 4782 } 4783 4784 /* Keepalive mode disabled or channel down? */ 4785 if (! (sp->pp_flags & PP_KEEPALIVE) || 4786 ! (ifp->if_flags & IFF_RUNNING)) 4787 continue; 4788 4789 /* No keepalive in PPP mode if LCP not opened yet. */ 4790 if (! (sp->pp_flags & PP_CISCO) && 4791 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4792 continue; 4793 4794 /* No echo reply, but maybe user data passed through? */ 4795 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4796 sp->pp_alivecnt = 0; 4797 continue; 4798 } 4799 4800 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4801 /* No keepalive packets got. Stop the interface. */ 4802 if_down (ifp); 4803 IF_PURGE(&sp->pp_cpq); 4804 if (! (sp->pp_flags & PP_CISCO)) { 4805 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4806 ifp->if_xname); 4807 sp->pp_alivecnt = 0; 4808 4809 /* we are down, close all open protocols */ 4810 lcp.Close(sp); 4811 4812 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4813 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4814 4815 /* Close connection imediatly, completition of this 4816 * will summon the magic needed to reestablish it. */ 4817 sp->pp_tlf(sp); 4818 continue; 4819 } 4820 } 4821 if (sp->pp_alivecnt < sp->pp_maxalive) 4822 ++sp->pp_alivecnt; 4823 if (sp->pp_flags & PP_CISCO) 4824 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4825 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4826 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4827 int32_t nmagic = htonl(sp->lcp.magic); 4828 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4829 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4830 sp->lcp.echoid, 4, &nmagic); 4831 } 4832 } 4833 splx(s); 4834 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4835 } 4836 4837 #ifdef INET 4838 /* 4839 * Get both IP addresses. 4840 */ 4841 static void 4842 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4843 { 4844 struct ifnet *ifp = &sp->pp_if; 4845 struct ifaddr *ifa; 4846 struct sockaddr_in *si, *sm; 4847 u_int32_t ssrc, ddst; 4848 4849 sm = NULL; 4850 ssrc = ddst = 0; 4851 /* 4852 * Pick the first AF_INET address from the list, 4853 * aliases don't make any sense on a p2p link anyway. 4854 */ 4855 si = 0; 4856 IFADDR_FOREACH(ifa, ifp) { 4857 if (ifa->ifa_addr->sa_family == AF_INET) { 4858 si = (struct sockaddr_in *)ifa->ifa_addr; 4859 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4860 if (si) 4861 break; 4862 } 4863 } 4864 if (ifa) { 4865 if (si && si->sin_addr.s_addr) { 4866 ssrc = si->sin_addr.s_addr; 4867 if (srcmask) 4868 *srcmask = ntohl(sm->sin_addr.s_addr); 4869 } 4870 4871 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4872 if (si && si->sin_addr.s_addr) 4873 ddst = si->sin_addr.s_addr; 4874 } 4875 4876 if (dst) *dst = ntohl(ddst); 4877 if (src) *src = ntohl(ssrc); 4878 } 4879 4880 /* 4881 * Set IP addresses. Must be called at splnet. 4882 * If an address is 0, leave it the way it is. 4883 */ 4884 static void 4885 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4886 { 4887 STDDCL; 4888 struct ifaddr *ifa; 4889 struct sockaddr_in *si, *dest; 4890 4891 /* 4892 * Pick the first AF_INET address from the list, 4893 * aliases don't make any sense on a p2p link anyway. 4894 */ 4895 4896 IFADDR_FOREACH(ifa, ifp) { 4897 if (ifa->ifa_addr->sa_family == AF_INET) { 4898 si = (struct sockaddr_in *)ifa->ifa_addr; 4899 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4900 goto found; 4901 } 4902 } 4903 return; 4904 4905 found: 4906 { 4907 int error; 4908 struct sockaddr_in new_sin = *si; 4909 struct sockaddr_in new_dst = *dest; 4910 4911 /* 4912 * Scrub old routes now instead of calling in_ifinit with 4913 * scrub=1, because we may change the dstaddr 4914 * before the call to in_ifinit. 4915 */ 4916 in_ifscrub(ifp, ifatoia(ifa)); 4917 4918 if (myaddr != 0) 4919 new_sin.sin_addr.s_addr = htonl(myaddr); 4920 if (hisaddr != 0) { 4921 new_dst.sin_addr.s_addr = htonl(hisaddr); 4922 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4923 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4924 *dest = new_dst; /* fix dstaddr in place */ 4925 } 4926 } 4927 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4928 if (debug && error) 4929 { 4930 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4931 " failed, error=%d\n", ifp->if_xname, error); 4932 } 4933 #ifdef PFIL_HOOKS 4934 if (!error) 4935 (void)pfil_run_hooks(&if_pfil, 4936 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4937 #endif 4938 } 4939 } 4940 4941 /* 4942 * Clear IP addresses. Must be called at splnet. 4943 */ 4944 static void 4945 sppp_clear_ip_addrs(struct sppp *sp) 4946 { 4947 struct ifnet *ifp = &sp->pp_if; 4948 struct ifaddr *ifa; 4949 struct sockaddr_in *si, *dest; 4950 4951 u_int32_t remote; 4952 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4953 remote = sp->ipcp.saved_hisaddr; 4954 else 4955 sppp_get_ip_addrs(sp, 0, &remote, 0); 4956 4957 /* 4958 * Pick the first AF_INET address from the list, 4959 * aliases don't make any sense on a p2p link anyway. 4960 */ 4961 4962 IFADDR_FOREACH(ifa, ifp) { 4963 if (ifa->ifa_addr->sa_family == AF_INET) { 4964 si = (struct sockaddr_in *)ifa->ifa_addr; 4965 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4966 goto found; 4967 } 4968 } 4969 return; 4970 4971 found: 4972 { 4973 struct sockaddr_in new_sin = *si; 4974 4975 in_ifscrub(ifp, ifatoia(ifa)); 4976 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4977 new_sin.sin_addr.s_addr = 0; 4978 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4979 /* replace peer addr in place */ 4980 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4981 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4982 #ifdef PFIL_HOOKS 4983 (void)pfil_run_hooks(&if_pfil, 4984 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4985 #endif 4986 } 4987 } 4988 #endif 4989 4990 #ifdef INET6 4991 /* 4992 * Get both IPv6 addresses. 4993 */ 4994 static void 4995 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4996 struct in6_addr *srcmask) 4997 { 4998 struct ifnet *ifp = &sp->pp_if; 4999 struct ifaddr *ifa; 5000 struct sockaddr_in6 *si, *sm; 5001 struct in6_addr ssrc, ddst; 5002 5003 sm = NULL; 5004 memset(&ssrc, 0, sizeof(ssrc)); 5005 memset(&ddst, 0, sizeof(ddst)); 5006 /* 5007 * Pick the first link-local AF_INET6 address from the list, 5008 * aliases don't make any sense on a p2p link anyway. 5009 */ 5010 si = 0; 5011 IFADDR_FOREACH(ifa, ifp) 5012 if (ifa->ifa_addr->sa_family == AF_INET6) { 5013 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5014 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5015 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5016 break; 5017 } 5018 if (ifa) { 5019 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5020 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 5021 if (srcmask) { 5022 bcopy(&sm->sin6_addr, srcmask, 5023 sizeof(*srcmask)); 5024 } 5025 } 5026 5027 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5028 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5029 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 5030 } 5031 5032 if (dst) 5033 bcopy(&ddst, dst, sizeof(*dst)); 5034 if (src) 5035 bcopy(&ssrc, src, sizeof(*src)); 5036 } 5037 5038 #ifdef IPV6CP_MYIFID_DYN 5039 /* 5040 * Generate random ifid. 5041 */ 5042 static void 5043 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5044 { 5045 /* TBD */ 5046 } 5047 5048 /* 5049 * Set my IPv6 address. Must be called at splnet. 5050 */ 5051 static void 5052 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5053 { 5054 STDDCL; 5055 struct ifaddr *ifa; 5056 struct sockaddr_in6 *sin6; 5057 5058 /* 5059 * Pick the first link-local AF_INET6 address from the list, 5060 * aliases don't make any sense on a p2p link anyway. 5061 */ 5062 5063 sin6 = NULL; 5064 IFADDR_FOREACH(ifa, ifp) 5065 { 5066 if (ifa->ifa_addr->sa_family == AF_INET6) 5067 { 5068 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5069 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5070 break; 5071 } 5072 } 5073 5074 if (ifa && sin6) 5075 { 5076 int error; 5077 struct sockaddr_in6 new_sin6 = *sin6; 5078 5079 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 5080 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5081 if (debug && error) 5082 { 5083 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5084 " failed, error=%d\n", ifp->if_xname, error); 5085 } 5086 #ifdef PFIL_HOOKS 5087 if (!error) 5088 (void)pfil_run_hooks(&if_pfil, 5089 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5090 #endif 5091 } 5092 } 5093 #endif 5094 5095 /* 5096 * Suggest a candidate address to be used by peer. 5097 */ 5098 static void 5099 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5100 { 5101 struct in6_addr myaddr; 5102 struct timeval tv; 5103 5104 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5105 5106 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5107 microtime(&tv); 5108 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5109 myaddr.s6_addr[14] ^= 0xff; 5110 myaddr.s6_addr[15] ^= 0xff; 5111 } else { 5112 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5113 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5114 } 5115 if (suggest) 5116 bcopy(&myaddr, suggest, sizeof(myaddr)); 5117 } 5118 #endif /*INET6*/ 5119 5120 /* 5121 * Process ioctl requests specific to the PPP interface. 5122 * Permissions have already been checked. 5123 */ 5124 static int 5125 sppp_params(struct sppp *sp, int cmd, void *data) 5126 { 5127 switch (cmd) { 5128 case SPPPGETAUTHCFG: 5129 { 5130 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5131 int error; 5132 size_t len; 5133 5134 cfg->myauthflags = sp->myauth.flags; 5135 cfg->hisauthflags = sp->hisauth.flags; 5136 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5137 cfg->hisauth = 0; 5138 if (sp->hisauth.proto) 5139 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5140 cfg->myauth = 0; 5141 if (sp->myauth.proto) 5142 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5143 if (cfg->myname_length == 0) { 5144 if (sp->myauth.name != NULL) 5145 cfg->myname_length = sp->myauth.name_len + 1; 5146 } else { 5147 if (sp->myauth.name == NULL) { 5148 cfg->myname_length = 0; 5149 } else { 5150 len = sp->myauth.name_len + 1; 5151 if (cfg->myname_length < len) 5152 return (ENAMETOOLONG); 5153 error = copyout(sp->myauth.name, cfg->myname, len); 5154 if (error) return error; 5155 } 5156 } 5157 if (cfg->hisname_length == 0) { 5158 if (sp->hisauth.name != NULL) 5159 cfg->hisname_length = sp->hisauth.name_len + 1; 5160 } else { 5161 if (sp->hisauth.name == NULL) { 5162 cfg->hisname_length = 0; 5163 } else { 5164 len = sp->hisauth.name_len + 1; 5165 if (cfg->hisname_length < len) 5166 return (ENAMETOOLONG); 5167 error = copyout(sp->hisauth.name, cfg->hisname, len); 5168 if (error) return error; 5169 } 5170 } 5171 } 5172 break; 5173 case SPPPSETAUTHCFG: 5174 { 5175 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5176 int error; 5177 5178 if (sp->myauth.name) { 5179 free(sp->myauth.name, M_DEVBUF); 5180 sp->myauth.name = NULL; 5181 } 5182 if (sp->myauth.secret) { 5183 free(sp->myauth.secret, M_DEVBUF); 5184 sp->myauth.secret = NULL; 5185 } 5186 if (sp->hisauth.name) { 5187 free(sp->hisauth.name, M_DEVBUF); 5188 sp->hisauth.name = NULL; 5189 } 5190 if (sp->hisauth.secret) { 5191 free(sp->hisauth.secret, M_DEVBUF); 5192 sp->hisauth.secret = NULL; 5193 } 5194 5195 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5196 if (cfg->hisname_length >= MCLBYTES) 5197 return (ENAMETOOLONG); 5198 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5199 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5200 if (error) { 5201 free(sp->hisauth.name, M_DEVBUF); 5202 sp->hisauth.name = NULL; 5203 return error; 5204 } 5205 sp->hisauth.name_len = cfg->hisname_length - 1; 5206 sp->hisauth.name[sp->hisauth.name_len] = 0; 5207 } 5208 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5209 if (cfg->hissecret_length >= MCLBYTES) 5210 return (ENAMETOOLONG); 5211 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5212 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5213 if (error) { 5214 free(sp->hisauth.secret, M_DEVBUF); 5215 sp->hisauth.secret = NULL; 5216 return error; 5217 } 5218 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5219 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5220 } 5221 if (cfg->myname != NULL && cfg->myname_length > 0) { 5222 if (cfg->myname_length >= MCLBYTES) 5223 return (ENAMETOOLONG); 5224 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5225 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5226 if (error) { 5227 free(sp->myauth.name, M_DEVBUF); 5228 sp->myauth.name = NULL; 5229 return error; 5230 } 5231 sp->myauth.name_len = cfg->myname_length - 1; 5232 sp->myauth.name[sp->myauth.name_len] = 0; 5233 } 5234 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5235 if (cfg->mysecret_length >= MCLBYTES) 5236 return (ENAMETOOLONG); 5237 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5238 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5239 if (error) { 5240 free(sp->myauth.secret, M_DEVBUF); 5241 sp->myauth.secret = NULL; 5242 return error; 5243 } 5244 sp->myauth.secret_len = cfg->mysecret_length - 1; 5245 sp->myauth.secret[sp->myauth.secret_len] = 0; 5246 } 5247 sp->myauth.flags = cfg->myauthflags; 5248 if (cfg->myauth) 5249 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5250 sp->hisauth.flags = cfg->hisauthflags; 5251 if (cfg->hisauth) 5252 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5253 sp->pp_auth_failures = 0; 5254 if (sp->hisauth.proto != 0) 5255 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5256 else 5257 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5258 } 5259 break; 5260 case SPPPGETLCPCFG: 5261 { 5262 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5263 lcp->lcp_timeout = sp->lcp.timeout; 5264 } 5265 break; 5266 case SPPPSETLCPCFG: 5267 { 5268 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5269 sp->lcp.timeout = lcp->lcp_timeout; 5270 } 5271 break; 5272 case SPPPGETSTATUS: 5273 { 5274 struct spppstatus *status = (struct spppstatus *)data; 5275 status->phase = sp->pp_phase; 5276 } 5277 break; 5278 case SPPPGETSTATUSNCP: 5279 { 5280 struct spppstatusncp *status = (struct spppstatusncp *)data; 5281 status->phase = sp->pp_phase; 5282 status->ncpup = sppp_ncp_check(sp); 5283 } 5284 break; 5285 case SPPPGETIDLETO: 5286 { 5287 struct spppidletimeout *to = (struct spppidletimeout *)data; 5288 to->idle_seconds = sp->pp_idle_timeout; 5289 } 5290 break; 5291 case SPPPSETIDLETO: 5292 { 5293 struct spppidletimeout *to = (struct spppidletimeout *)data; 5294 sp->pp_idle_timeout = to->idle_seconds; 5295 } 5296 break; 5297 case SPPPSETAUTHFAILURE: 5298 { 5299 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5300 sp->pp_max_auth_fail = afsettings->max_failures; 5301 sp->pp_auth_failures = 0; 5302 } 5303 break; 5304 case SPPPGETAUTHFAILURES: 5305 { 5306 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5307 stats->auth_failures = sp->pp_auth_failures; 5308 stats->max_failures = sp->pp_max_auth_fail; 5309 } 5310 break; 5311 case SPPPSETDNSOPTS: 5312 { 5313 struct spppdnssettings *req = (struct spppdnssettings *)data; 5314 sp->query_dns = req->query_dns & 3; 5315 } 5316 break; 5317 case SPPPGETDNSOPTS: 5318 { 5319 struct spppdnssettings *req = (struct spppdnssettings *)data; 5320 req->query_dns = sp->query_dns; 5321 } 5322 break; 5323 case SPPPGETDNSADDRS: 5324 { 5325 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5326 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5327 } 5328 break; 5329 case SPPPGETKEEPALIVE: 5330 { 5331 struct spppkeepalivesettings *settings = 5332 (struct spppkeepalivesettings*)data; 5333 settings->maxalive = sp->pp_maxalive; 5334 settings->max_noreceive = sp->pp_max_noreceive; 5335 } 5336 break; 5337 case SPPPSETKEEPALIVE: 5338 { 5339 struct spppkeepalivesettings *settings = 5340 (struct spppkeepalivesettings*)data; 5341 sp->pp_maxalive = settings->maxalive; 5342 sp->pp_max_noreceive = settings->max_noreceive; 5343 } 5344 break; 5345 default: 5346 return (EINVAL); 5347 } 5348 5349 return (0); 5350 } 5351 5352 static void 5353 sppp_phase_network(struct sppp *sp) 5354 { 5355 STDDCL; 5356 int i; 5357 u_int32_t mask; 5358 5359 sp->pp_phase = SPPP_PHASE_NETWORK; 5360 5361 if (debug) 5362 { 5363 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5364 sppp_phase_name(sp->pp_phase)); 5365 } 5366 5367 /* Notify NCPs now. */ 5368 for (i = 0; i < IDX_COUNT; i++) 5369 if ((cps[i])->flags & CP_NCP) 5370 (cps[i])->Open(sp); 5371 5372 /* Send Up events to all NCPs. */ 5373 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5374 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5375 (cps[i])->Up(sp); 5376 5377 /* if no NCP is starting, all this was in vain, close down */ 5378 sppp_lcp_check_and_close(sp); 5379 } 5380 5381 5382 static const char * 5383 sppp_cp_type_name(u_char type) 5384 { 5385 static char buf[12]; 5386 switch (type) { 5387 case CONF_REQ: return "conf-req"; 5388 case CONF_ACK: return "conf-ack"; 5389 case CONF_NAK: return "conf-nak"; 5390 case CONF_REJ: return "conf-rej"; 5391 case TERM_REQ: return "term-req"; 5392 case TERM_ACK: return "term-ack"; 5393 case CODE_REJ: return "code-rej"; 5394 case PROTO_REJ: return "proto-rej"; 5395 case ECHO_REQ: return "echo-req"; 5396 case ECHO_REPLY: return "echo-reply"; 5397 case DISC_REQ: return "discard-req"; 5398 } 5399 snprintf(buf, sizeof(buf), "0x%x", type); 5400 return buf; 5401 } 5402 5403 static const char * 5404 sppp_auth_type_name(u_short proto, u_char type) 5405 { 5406 static char buf[12]; 5407 switch (proto) { 5408 case PPP_CHAP: 5409 switch (type) { 5410 case CHAP_CHALLENGE: return "challenge"; 5411 case CHAP_RESPONSE: return "response"; 5412 case CHAP_SUCCESS: return "success"; 5413 case CHAP_FAILURE: return "failure"; 5414 } 5415 case PPP_PAP: 5416 switch (type) { 5417 case PAP_REQ: return "req"; 5418 case PAP_ACK: return "ack"; 5419 case PAP_NAK: return "nak"; 5420 } 5421 } 5422 snprintf(buf, sizeof(buf), "0x%x", type); 5423 return buf; 5424 } 5425 5426 static const char * 5427 sppp_lcp_opt_name(u_char opt) 5428 { 5429 static char buf[12]; 5430 switch (opt) { 5431 case LCP_OPT_MRU: return "mru"; 5432 case LCP_OPT_ASYNC_MAP: return "async-map"; 5433 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5434 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5435 case LCP_OPT_MAGIC: return "magic"; 5436 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5437 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5438 } 5439 snprintf(buf, sizeof(buf), "0x%x", opt); 5440 return buf; 5441 } 5442 5443 static const char * 5444 sppp_ipcp_opt_name(u_char opt) 5445 { 5446 static char buf[12]; 5447 switch (opt) { 5448 case IPCP_OPT_ADDRESSES: return "addresses"; 5449 case IPCP_OPT_COMPRESSION: return "compression"; 5450 case IPCP_OPT_ADDRESS: return "address"; 5451 } 5452 snprintf(buf, sizeof(buf), "0x%x", opt); 5453 return buf; 5454 } 5455 5456 #ifdef INET6 5457 static const char * 5458 sppp_ipv6cp_opt_name(u_char opt) 5459 { 5460 static char buf[12]; 5461 switch (opt) { 5462 case IPV6CP_OPT_IFID: return "ifid"; 5463 case IPV6CP_OPT_COMPRESSION: return "compression"; 5464 } 5465 snprintf(buf, sizeof(buf), "0x%x", opt); 5466 return buf; 5467 } 5468 #endif 5469 5470 static const char * 5471 sppp_state_name(int state) 5472 { 5473 switch (state) { 5474 case STATE_INITIAL: return "initial"; 5475 case STATE_STARTING: return "starting"; 5476 case STATE_CLOSED: return "closed"; 5477 case STATE_STOPPED: return "stopped"; 5478 case STATE_CLOSING: return "closing"; 5479 case STATE_STOPPING: return "stopping"; 5480 case STATE_REQ_SENT: return "req-sent"; 5481 case STATE_ACK_RCVD: return "ack-rcvd"; 5482 case STATE_ACK_SENT: return "ack-sent"; 5483 case STATE_OPENED: return "opened"; 5484 } 5485 return "illegal"; 5486 } 5487 5488 static const char * 5489 sppp_phase_name(int phase) 5490 { 5491 switch (phase) { 5492 case SPPP_PHASE_DEAD: return "dead"; 5493 case SPPP_PHASE_ESTABLISH: return "establish"; 5494 case SPPP_PHASE_TERMINATE: return "terminate"; 5495 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5496 case SPPP_PHASE_NETWORK: return "network"; 5497 } 5498 return "illegal"; 5499 } 5500 5501 static const char * 5502 sppp_proto_name(u_short proto) 5503 { 5504 static char buf[12]; 5505 switch (proto) { 5506 case PPP_LCP: return "lcp"; 5507 case PPP_IPCP: return "ipcp"; 5508 case PPP_PAP: return "pap"; 5509 case PPP_CHAP: return "chap"; 5510 case PPP_IPV6CP: return "ipv6cp"; 5511 } 5512 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5513 return buf; 5514 } 5515 5516 static void 5517 sppp_print_bytes(const u_char *p, u_short len) 5518 { 5519 addlog(" %02x", *p++); 5520 while (--len > 0) 5521 addlog("-%02x", *p++); 5522 } 5523 5524 static void 5525 sppp_print_string(const char *p, u_short len) 5526 { 5527 u_char c; 5528 5529 while (len-- > 0) { 5530 c = *p++; 5531 /* 5532 * Print only ASCII chars directly. RFC 1994 recommends 5533 * using only them, but we don't rely on it. */ 5534 if (c < ' ' || c > '~') 5535 addlog("\\x%x", c); 5536 else 5537 addlog("%c", c); 5538 } 5539 } 5540 5541 static const char * 5542 sppp_dotted_quad(u_int32_t addr) 5543 { 5544 static char s[16]; 5545 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5546 (int)((addr >> 24) & 0xff), 5547 (int)((addr >> 16) & 0xff), 5548 (int)((addr >> 8) & 0xff), 5549 (int)(addr & 0xff)); 5550 return s; 5551 } 5552 5553 /* a dummy, used to drop uninteresting events */ 5554 static void 5555 sppp_null(struct sppp *unused) 5556 { 5557 /* do just nothing */ 5558 } 5559 /* 5560 * This file is large. Tell emacs to highlight it nevertheless. 5561 * 5562 * Local Variables: 5563 * hilit-auto-highlight-maxout: 120000 5564 * End: 5565 */ 5566
Indexes created Tue Oct 14 11:09:46 GMT 2025