if_spppsubr.c revision 1.79
1 /* $NetBSD: if_spppsubr.c,v 1.79 2004/12/06 02:59:23 christos 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 1.79 2004/12/06 02:59:23 christos 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 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 log(LOG_DEBUG, 1399 "%s: %s input(%s): <%s id=0x%x len=%d", 1400 ifp->if_xname, cp->name, 1401 sppp_state_name(sp->state[cp->protoidx]), 1402 sppp_cp_type_name(h->type), h->ident, ntohs(h->len)); 1403 if (len > 4) 1404 sppp_print_bytes((u_char *)(h + 1), len - 4); 1405 addlog(">\n"); 1406 } 1407 if (len > ntohs(h->len)) 1408 len = ntohs(h->len); 1409 p = (u_char *)(h + 1); 1410 switch (h->type) { 1411 case CONF_REQ: 1412 if (len < 4) { 1413 if (debug) 1414 addlog("%s: %s invalid conf-req length %d\n", 1415 ifp->if_xname, cp->name, 1416 len); 1417 ++ifp->if_ierrors; 1418 break; 1419 } 1420 /* handle states where RCR doesn't get a SCA/SCN */ 1421 switch (sp->state[cp->protoidx]) { 1422 case STATE_CLOSING: 1423 case STATE_STOPPING: 1424 return; 1425 case STATE_CLOSED: 1426 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1427 0, 0); 1428 return; 1429 } 1430 rv = (cp->RCR)(sp, h, len); 1431 switch (sp->state[cp->protoidx]) { 1432 case STATE_OPENED: 1433 (cp->tld)(sp); 1434 (cp->scr)(sp); 1435 /* fall through... */ 1436 case STATE_ACK_SENT: 1437 case STATE_REQ_SENT: 1438 sppp_cp_change_state(cp, sp, rv? 1439 STATE_ACK_SENT: STATE_REQ_SENT); 1440 break; 1441 case STATE_STOPPED: 1442 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1443 (cp->scr)(sp); 1444 sppp_cp_change_state(cp, sp, rv? 1445 STATE_ACK_SENT: STATE_REQ_SENT); 1446 break; 1447 case STATE_ACK_RCVD: 1448 if (rv) { 1449 sppp_cp_change_state(cp, sp, STATE_OPENED); 1450 if (debug) 1451 log(LOG_DEBUG, "%s: %s tlu\n", 1452 ifp->if_xname, 1453 cp->name); 1454 (cp->tlu)(sp); 1455 } else 1456 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1457 break; 1458 default: 1459 printf("%s: %s illegal %s in state %s\n", 1460 ifp->if_xname, cp->name, 1461 sppp_cp_type_name(h->type), 1462 sppp_state_name(sp->state[cp->protoidx])); 1463 ++ifp->if_ierrors; 1464 } 1465 break; 1466 case CONF_ACK: 1467 if (h->ident != sp->confid[cp->protoidx]) { 1468 if (debug) 1469 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1470 ifp->if_xname, cp->name, 1471 h->ident, sp->confid[cp->protoidx]); 1472 ++ifp->if_ierrors; 1473 break; 1474 } 1475 switch (sp->state[cp->protoidx]) { 1476 case STATE_CLOSED: 1477 case STATE_STOPPED: 1478 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1479 break; 1480 case STATE_CLOSING: 1481 case STATE_STOPPING: 1482 break; 1483 case STATE_REQ_SENT: 1484 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1485 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1486 break; 1487 case STATE_OPENED: 1488 (cp->tld)(sp); 1489 /* fall through */ 1490 case STATE_ACK_RCVD: 1491 (cp->scr)(sp); 1492 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1493 break; 1494 case STATE_ACK_SENT: 1495 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1496 sppp_cp_change_state(cp, sp, STATE_OPENED); 1497 if (debug) 1498 log(LOG_DEBUG, "%s: %s tlu\n", 1499 ifp->if_xname, cp->name); 1500 (cp->tlu)(sp); 1501 break; 1502 default: 1503 printf("%s: %s illegal %s in state %s\n", 1504 ifp->if_xname, cp->name, 1505 sppp_cp_type_name(h->type), 1506 sppp_state_name(sp->state[cp->protoidx])); 1507 ++ifp->if_ierrors; 1508 } 1509 break; 1510 case CONF_NAK: 1511 case CONF_REJ: 1512 if (h->ident != sp->confid[cp->protoidx]) { 1513 if (debug) 1514 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1515 ifp->if_xname, cp->name, 1516 h->ident, sp->confid[cp->protoidx]); 1517 ++ifp->if_ierrors; 1518 break; 1519 } 1520 if (h->type == CONF_NAK) 1521 (cp->RCN_nak)(sp, h, len); 1522 else /* CONF_REJ */ 1523 (cp->RCN_rej)(sp, h, len); 1524 1525 switch (sp->state[cp->protoidx]) { 1526 case STATE_CLOSED: 1527 case STATE_STOPPED: 1528 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1529 break; 1530 case STATE_REQ_SENT: 1531 case STATE_ACK_SENT: 1532 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1533 (cp->scr)(sp); 1534 break; 1535 case STATE_OPENED: 1536 (cp->tld)(sp); 1537 /* fall through */ 1538 case STATE_ACK_RCVD: 1539 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1540 (cp->scr)(sp); 1541 break; 1542 case STATE_CLOSING: 1543 case STATE_STOPPING: 1544 break; 1545 default: 1546 printf("%s: %s illegal %s in state %s\n", 1547 ifp->if_xname, cp->name, 1548 sppp_cp_type_name(h->type), 1549 sppp_state_name(sp->state[cp->protoidx])); 1550 ++ifp->if_ierrors; 1551 } 1552 break; 1553 1554 case TERM_REQ: 1555 switch (sp->state[cp->protoidx]) { 1556 case STATE_ACK_RCVD: 1557 case STATE_ACK_SENT: 1558 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1559 /* fall through */ 1560 case STATE_CLOSED: 1561 case STATE_STOPPED: 1562 case STATE_CLOSING: 1563 case STATE_STOPPING: 1564 case STATE_REQ_SENT: 1565 sta: 1566 /* Send Terminate-Ack packet. */ 1567 if (debug) 1568 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1569 ifp->if_xname, cp->name); 1570 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1571 break; 1572 case STATE_OPENED: 1573 (cp->tld)(sp); 1574 sp->rst_counter[cp->protoidx] = 0; 1575 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1576 goto sta; 1577 default: 1578 printf("%s: %s illegal %s in state %s\n", 1579 ifp->if_xname, cp->name, 1580 sppp_cp_type_name(h->type), 1581 sppp_state_name(sp->state[cp->protoidx])); 1582 ++ifp->if_ierrors; 1583 } 1584 break; 1585 case TERM_ACK: 1586 switch (sp->state[cp->protoidx]) { 1587 case STATE_CLOSED: 1588 case STATE_STOPPED: 1589 case STATE_REQ_SENT: 1590 case STATE_ACK_SENT: 1591 break; 1592 case STATE_CLOSING: 1593 (cp->tlf)(sp); 1594 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1595 sppp_lcp_check_and_close(sp); 1596 break; 1597 case STATE_STOPPING: 1598 (cp->tlf)(sp); 1599 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1600 sppp_lcp_check_and_close(sp); 1601 break; 1602 case STATE_ACK_RCVD: 1603 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1604 break; 1605 case STATE_OPENED: 1606 (cp->tld)(sp); 1607 (cp->scr)(sp); 1608 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1609 break; 1610 default: 1611 printf("%s: %s illegal %s in state %s\n", 1612 ifp->if_xname, cp->name, 1613 sppp_cp_type_name(h->type), 1614 sppp_state_name(sp->state[cp->protoidx])); 1615 ++ifp->if_ierrors; 1616 } 1617 break; 1618 case CODE_REJ: 1619 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1620 log(LOG_INFO, 1621 "%s: %s: ignoring RXJ (%s) for code ?, " 1622 "danger will robinson\n", 1623 ifp->if_xname, cp->name, 1624 sppp_cp_type_name(h->type)); 1625 switch (sp->state[cp->protoidx]) { 1626 case STATE_CLOSED: 1627 case STATE_STOPPED: 1628 case STATE_REQ_SENT: 1629 case STATE_ACK_SENT: 1630 case STATE_CLOSING: 1631 case STATE_STOPPING: 1632 case STATE_OPENED: 1633 break; 1634 case STATE_ACK_RCVD: 1635 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1636 break; 1637 default: 1638 printf("%s: %s illegal %s in state %s\n", 1639 ifp->if_xname, cp->name, 1640 sppp_cp_type_name(h->type), 1641 sppp_state_name(sp->state[cp->protoidx])); 1642 ++ifp->if_ierrors; 1643 } 1644 break; 1645 case PROTO_REJ: 1646 { 1647 int catastrophic; 1648 const struct cp *upper; 1649 int i; 1650 u_int16_t proto; 1651 1652 catastrophic = 0; 1653 upper = NULL; 1654 proto = p[0] << 8 | p[1]; 1655 for (i = 0; i < IDX_COUNT; i++) { 1656 if (cps[i]->proto == proto) { 1657 upper = cps[i]; 1658 break; 1659 } 1660 } 1661 if (upper == NULL) 1662 catastrophic++; 1663 1664 if (debug) 1665 log(LOG_INFO, 1666 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1667 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1668 sppp_cp_type_name(h->type), proto, 1669 upper ? upper->name : "unknown", 1670 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1671 1672 /* 1673 * if we got RXJ+ against conf-req, the peer does not implement 1674 * this particular protocol type. terminate the protocol. 1675 */ 1676 if (upper && !catastrophic) { 1677 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1678 upper->Close(sp); 1679 break; 1680 } 1681 } 1682 1683 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1684 switch (sp->state[cp->protoidx]) { 1685 case STATE_CLOSED: 1686 case STATE_STOPPED: 1687 case STATE_REQ_SENT: 1688 case STATE_ACK_SENT: 1689 case STATE_CLOSING: 1690 case STATE_STOPPING: 1691 case STATE_OPENED: 1692 break; 1693 case STATE_ACK_RCVD: 1694 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1695 break; 1696 default: 1697 printf("%s: %s illegal %s in state %s\n", 1698 ifp->if_xname, cp->name, 1699 sppp_cp_type_name(h->type), 1700 sppp_state_name(sp->state[cp->protoidx])); 1701 ++ifp->if_ierrors; 1702 } 1703 break; 1704 } 1705 case DISC_REQ: 1706 if (cp->proto != PPP_LCP) 1707 goto illegal; 1708 /* Discard the packet. */ 1709 break; 1710 case ECHO_REQ: 1711 if (cp->proto != PPP_LCP) 1712 goto illegal; 1713 if (sp->state[cp->protoidx] != STATE_OPENED) { 1714 if (debug) 1715 addlog("%s: lcp echo req but lcp closed\n", 1716 ifp->if_xname); 1717 ++ifp->if_ierrors; 1718 break; 1719 } 1720 if (len < 8) { 1721 if (debug) 1722 addlog("%s: invalid lcp echo request " 1723 "packet length: %d bytes\n", 1724 ifp->if_xname, len); 1725 break; 1726 } 1727 memcpy(&u32, h + 1, sizeof u32); 1728 if (ntohl(u32) == sp->lcp.magic) { 1729 /* Line loopback mode detected. */ 1730 printf("%s: loopback\n", ifp->if_xname); 1731 if_down(ifp); 1732 IF_PURGE(&sp->pp_cpq); 1733 1734 /* Shut down the PPP link. */ 1735 /* XXX */ 1736 lcp.Down(sp); 1737 lcp.Up(sp); 1738 break; 1739 } 1740 u32 = htonl(sp->lcp.magic); 1741 memcpy(h + 1, &u32, sizeof u32); 1742 if (debug) 1743 addlog("%s: got lcp echo req, sending echo rep\n", 1744 ifp->if_xname); 1745 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1746 h + 1); 1747 break; 1748 case ECHO_REPLY: 1749 if (cp->proto != PPP_LCP) 1750 goto illegal; 1751 if (h->ident != sp->lcp.echoid) { 1752 ++ifp->if_ierrors; 1753 break; 1754 } 1755 if (len < 8) { 1756 if (debug) 1757 addlog("%s: lcp invalid echo reply " 1758 "packet length: %d bytes\n", 1759 ifp->if_xname, len); 1760 break; 1761 } 1762 if (debug) 1763 addlog("%s: lcp got echo rep\n", 1764 ifp->if_xname); 1765 memcpy(&u32, h + 1, sizeof u32); 1766 if (ntohl(u32) != sp->lcp.magic) 1767 sp->pp_alivecnt = 0; 1768 break; 1769 default: 1770 /* Unknown packet type -- send Code-Reject packet. */ 1771 illegal: 1772 if (debug) 1773 addlog("%s: %s send code-rej for 0x%x\n", 1774 ifp->if_xname, cp->name, h->type); 1775 sppp_cp_send(sp, cp->proto, CODE_REJ, 1776 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1777 ++ifp->if_ierrors; 1778 } 1779 } 1780 1781 1782 /* 1783 * The generic part of all Up/Down/Open/Close/TO event handlers. 1784 * Basically, the state transition handling in the automaton. 1785 */ 1786 static void 1787 sppp_up_event(const struct cp *cp, struct sppp *sp) 1788 { 1789 STDDCL; 1790 1791 if (debug) 1792 log(LOG_DEBUG, "%s: %s up(%s)\n", 1793 ifp->if_xname, cp->name, 1794 sppp_state_name(sp->state[cp->protoidx])); 1795 1796 switch (sp->state[cp->protoidx]) { 1797 case STATE_INITIAL: 1798 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1799 break; 1800 case STATE_STARTING: 1801 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1802 (cp->scr)(sp); 1803 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1804 break; 1805 default: 1806 printf("%s: %s illegal up in state %s\n", 1807 ifp->if_xname, cp->name, 1808 sppp_state_name(sp->state[cp->protoidx])); 1809 } 1810 } 1811 1812 static void 1813 sppp_down_event(const struct cp *cp, struct sppp *sp) 1814 { 1815 STDDCL; 1816 1817 if (debug) 1818 log(LOG_DEBUG, "%s: %s down(%s)\n", 1819 ifp->if_xname, cp->name, 1820 sppp_state_name(sp->state[cp->protoidx])); 1821 1822 switch (sp->state[cp->protoidx]) { 1823 case STATE_CLOSED: 1824 case STATE_CLOSING: 1825 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1826 break; 1827 case STATE_STOPPED: 1828 (cp->tls)(sp); 1829 /* fall through */ 1830 case STATE_STOPPING: 1831 case STATE_REQ_SENT: 1832 case STATE_ACK_RCVD: 1833 case STATE_ACK_SENT: 1834 sppp_cp_change_state(cp, sp, STATE_STARTING); 1835 break; 1836 case STATE_OPENED: 1837 (cp->tld)(sp); 1838 sppp_cp_change_state(cp, sp, STATE_STARTING); 1839 break; 1840 default: 1841 printf("%s: %s illegal down in state %s\n", 1842 ifp->if_xname, cp->name, 1843 sppp_state_name(sp->state[cp->protoidx])); 1844 } 1845 } 1846 1847 1848 static void 1849 sppp_open_event(const struct cp *cp, struct sppp *sp) 1850 { 1851 STDDCL; 1852 1853 if (debug) 1854 log(LOG_DEBUG, "%s: %s open(%s)\n", 1855 ifp->if_xname, cp->name, 1856 sppp_state_name(sp->state[cp->protoidx])); 1857 1858 switch (sp->state[cp->protoidx]) { 1859 case STATE_INITIAL: 1860 (cp->tls)(sp); 1861 sppp_cp_change_state(cp, sp, STATE_STARTING); 1862 break; 1863 case STATE_STARTING: 1864 break; 1865 case STATE_CLOSED: 1866 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1867 (cp->scr)(sp); 1868 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1869 break; 1870 case STATE_STOPPED: 1871 case STATE_STOPPING: 1872 case STATE_REQ_SENT: 1873 case STATE_ACK_RCVD: 1874 case STATE_ACK_SENT: 1875 case STATE_OPENED: 1876 break; 1877 case STATE_CLOSING: 1878 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1879 break; 1880 } 1881 } 1882 1883 1884 static void 1885 sppp_close_event(const struct cp *cp, struct sppp *sp) 1886 { 1887 STDDCL; 1888 1889 if (debug) 1890 log(LOG_DEBUG, "%s: %s close(%s)\n", 1891 ifp->if_xname, cp->name, 1892 sppp_state_name(sp->state[cp->protoidx])); 1893 1894 switch (sp->state[cp->protoidx]) { 1895 case STATE_INITIAL: 1896 case STATE_CLOSED: 1897 case STATE_CLOSING: 1898 break; 1899 case STATE_STARTING: 1900 (cp->tlf)(sp); 1901 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1902 break; 1903 case STATE_STOPPED: 1904 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1905 break; 1906 case STATE_STOPPING: 1907 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1908 break; 1909 case STATE_OPENED: 1910 (cp->tld)(sp); 1911 /* fall through */ 1912 case STATE_REQ_SENT: 1913 case STATE_ACK_RCVD: 1914 case STATE_ACK_SENT: 1915 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1916 sppp_cp_send(sp, cp->proto, TERM_REQ, 1917 ++sp->pp_seq[cp->protoidx], 0, 0); 1918 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1919 break; 1920 } 1921 } 1922 1923 static void 1924 sppp_to_event(const struct cp *cp, struct sppp *sp) 1925 { 1926 STDDCL; 1927 int s; 1928 1929 s = splnet(); 1930 if (debug) 1931 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1932 ifp->if_xname, cp->name, 1933 sppp_state_name(sp->state[cp->protoidx]), 1934 sp->rst_counter[cp->protoidx]); 1935 1936 if (--sp->rst_counter[cp->protoidx] < 0) 1937 /* TO- event */ 1938 switch (sp->state[cp->protoidx]) { 1939 case STATE_CLOSING: 1940 (cp->tlf)(sp); 1941 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1942 sppp_lcp_check_and_close(sp); 1943 break; 1944 case STATE_STOPPING: 1945 (cp->tlf)(sp); 1946 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1947 sppp_lcp_check_and_close(sp); 1948 break; 1949 case STATE_REQ_SENT: 1950 case STATE_ACK_RCVD: 1951 case STATE_ACK_SENT: 1952 (cp->tlf)(sp); 1953 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1954 sppp_lcp_check_and_close(sp); 1955 break; 1956 } 1957 else 1958 /* TO+ event */ 1959 switch (sp->state[cp->protoidx]) { 1960 case STATE_CLOSING: 1961 case STATE_STOPPING: 1962 sppp_cp_send(sp, cp->proto, TERM_REQ, 1963 ++sp->pp_seq[cp->protoidx], 0, 0); 1964 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1965 cp->TO, sp); 1966 break; 1967 case STATE_REQ_SENT: 1968 case STATE_ACK_RCVD: 1969 (cp->scr)(sp); 1970 /* sppp_cp_change_state() will restart the timer */ 1971 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1972 break; 1973 case STATE_ACK_SENT: 1974 (cp->scr)(sp); 1975 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1976 cp->TO, sp); 1977 break; 1978 } 1979 1980 splx(s); 1981 } 1982 1983 /* 1984 * Change the state of a control protocol in the state automaton. 1985 * Takes care of starting/stopping the restart timer. 1986 */ 1987 void 1988 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1989 { 1990 sp->state[cp->protoidx] = newstate; 1991 callout_stop(&sp->ch[cp->protoidx]); 1992 switch (newstate) { 1993 case STATE_INITIAL: 1994 case STATE_STARTING: 1995 case STATE_CLOSED: 1996 case STATE_STOPPED: 1997 case STATE_OPENED: 1998 break; 1999 case STATE_CLOSING: 2000 case STATE_STOPPING: 2001 case STATE_REQ_SENT: 2002 case STATE_ACK_RCVD: 2003 case STATE_ACK_SENT: 2004 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2005 cp->TO, sp); 2006 break; 2007 } 2008 } 2009 2010 /* 2011 *--------------------------------------------------------------------------* 2012 * * 2013 * The LCP implementation. * 2014 * * 2015 *--------------------------------------------------------------------------* 2016 */ 2017 static void 2018 sppp_lcp_init(struct sppp *sp) 2019 { 2020 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2021 sp->lcp.magic = 0; 2022 sp->state[IDX_LCP] = STATE_INITIAL; 2023 sp->fail_counter[IDX_LCP] = 0; 2024 sp->pp_seq[IDX_LCP] = 0; 2025 sp->pp_rseq[IDX_LCP] = 0; 2026 sp->lcp.protos = 0; 2027 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2028 2029 /* 2030 * Initialize counters and timeout values. Note that we don't 2031 * use the 3 seconds suggested in RFC 1661 since we are likely 2032 * running on a fast link. XXX We should probably implement 2033 * the exponential backoff option. Note that these values are 2034 * relevant for all control protocols, not just LCP only. 2035 */ 2036 sp->lcp.timeout = 1 * hz; 2037 sp->lcp.max_terminate = 2; 2038 sp->lcp.max_configure = 10; 2039 sp->lcp.max_failure = 10; 2040 callout_init(&sp->ch[IDX_LCP]); 2041 } 2042 2043 static void 2044 sppp_lcp_up(struct sppp *sp) 2045 { 2046 STDDCL; 2047 2048 /* Initialize activity timestamp: opening a connection is an activity */ 2049 sp->pp_last_receive = sp->pp_last_activity = mono_time.tv_sec; 2050 2051 /* 2052 * If this interface is passive or dial-on-demand, and we are 2053 * still in Initial state, it means we've got an incoming 2054 * call. Activate the interface. 2055 */ 2056 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2057 if (debug) 2058 log(LOG_DEBUG, 2059 "%s: Up event", ifp->if_xname); 2060 ifp->if_flags |= IFF_RUNNING; 2061 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2062 if (debug) 2063 addlog("(incoming call)\n"); 2064 sp->pp_flags |= PP_CALLIN; 2065 lcp.Open(sp); 2066 } else if (debug) 2067 addlog("\n"); 2068 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2069 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2070 ifp->if_flags |= IFF_RUNNING; 2071 lcp.Open(sp); 2072 } 2073 2074 sppp_up_event(&lcp, sp); 2075 } 2076 2077 static void 2078 sppp_lcp_down(struct sppp *sp) 2079 { 2080 STDDCL; 2081 2082 sppp_down_event(&lcp, sp); 2083 2084 /* 2085 * If this is neither a dial-on-demand nor a passive 2086 * interface, simulate an ``ifconfig down'' action, so the 2087 * administrator can force a redial by another ``ifconfig 2088 * up''. XXX For leased line operation, should we immediately 2089 * try to reopen the connection here? 2090 */ 2091 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2092 if (debug) 2093 log(LOG_INFO, 2094 "%s: Down event (carrier loss), taking interface down.\n", 2095 ifp->if_xname); 2096 if_down(ifp); 2097 } else { 2098 if (debug) 2099 log(LOG_DEBUG, 2100 "%s: Down event (carrier loss)\n", 2101 ifp->if_xname); 2102 } 2103 sp->pp_flags &= ~PP_CALLIN; 2104 if (sp->state[IDX_LCP] != STATE_INITIAL) 2105 lcp.Close(sp); 2106 ifp->if_flags &= ~IFF_RUNNING; 2107 } 2108 2109 static void 2110 sppp_lcp_open(struct sppp *sp) 2111 { 2112 /* 2113 * If we are authenticator, negotiate LCP_AUTH 2114 */ 2115 if (sp->hisauth.proto != 0) 2116 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2117 else 2118 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2119 sp->pp_flags &= ~PP_NEEDAUTH; 2120 sppp_open_event(&lcp, sp); 2121 } 2122 2123 static void 2124 sppp_lcp_close(struct sppp *sp) 2125 { 2126 sppp_close_event(&lcp, sp); 2127 } 2128 2129 static void 2130 sppp_lcp_TO(void *cookie) 2131 { 2132 sppp_to_event(&lcp, (struct sppp *)cookie); 2133 } 2134 2135 /* 2136 * Analyze a configure request. Return true if it was agreeable, and 2137 * caused action sca, false if it has been rejected or nak'ed, and 2138 * caused action scn. (The return value is used to make the state 2139 * transition decision in the state automaton.) 2140 */ 2141 static int 2142 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2143 { 2144 STDDCL; 2145 u_char *buf, *r, *p; 2146 int origlen, rlen; 2147 u_int32_t nmagic; 2148 u_short authproto; 2149 2150 len -= 4; 2151 origlen = len; 2152 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2153 if (! buf) 2154 return (0); 2155 2156 if (debug) 2157 log(LOG_DEBUG, "%s: lcp parse opts:", 2158 ifp->if_xname); 2159 2160 /* pass 1: check for things that need to be rejected */ 2161 p = (void *)(h + 1); 2162 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2163 if (debug) 2164 addlog(" %s", sppp_lcp_opt_name(*p)); 2165 switch (*p) { 2166 case LCP_OPT_MAGIC: 2167 /* Magic number. */ 2168 /* fall through, both are same length */ 2169 case LCP_OPT_ASYNC_MAP: 2170 /* Async control character map. */ 2171 if (len >= 6 || p[1] == 6) 2172 continue; 2173 if (debug) 2174 addlog(" [invalid]"); 2175 break; 2176 case LCP_OPT_MRU: 2177 /* Maximum receive unit. */ 2178 if (len >= 4 && p[1] == 4) 2179 continue; 2180 if (debug) 2181 addlog(" [invalid]"); 2182 break; 2183 case LCP_OPT_AUTH_PROTO: 2184 if (len < 4) { 2185 if (debug) 2186 addlog(" [invalid]"); 2187 break; 2188 } 2189 authproto = (p[2] << 8) + p[3]; 2190 if (authproto == PPP_CHAP && p[1] != 5) { 2191 if (debug) 2192 addlog(" [invalid chap len]"); 2193 break; 2194 } 2195 if (sp->myauth.proto == 0) { 2196 /* we are not configured to do auth */ 2197 if (debug) 2198 addlog(" [not configured]"); 2199 break; 2200 } 2201 /* 2202 * Remote want us to authenticate, remember this, 2203 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2204 * up. 2205 */ 2206 sp->pp_flags |= PP_NEEDAUTH; 2207 continue; 2208 default: 2209 /* Others not supported. */ 2210 if (debug) 2211 addlog(" [rej]"); 2212 break; 2213 } 2214 /* Add the option to rejected list. */ 2215 bcopy (p, r, p[1]); 2216 r += p[1]; 2217 rlen += p[1]; 2218 } 2219 if (rlen) { 2220 if (debug) 2221 addlog(" send conf-rej\n"); 2222 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2223 goto end; 2224 } else if (debug) 2225 addlog("\n"); 2226 2227 /* 2228 * pass 2: check for option values that are unacceptable and 2229 * thus require to be nak'ed. 2230 */ 2231 if (debug) 2232 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2233 ifp->if_xname); 2234 2235 p = (void *)(h + 1); 2236 len = origlen; 2237 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2238 if (debug) 2239 addlog(" %s", sppp_lcp_opt_name(*p)); 2240 switch (*p) { 2241 case LCP_OPT_MAGIC: 2242 /* Magic number -- extract. */ 2243 nmagic = (u_int32_t)p[2] << 24 | 2244 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2245 if (nmagic != sp->lcp.magic) { 2246 if (debug) 2247 addlog(" 0x%x", nmagic); 2248 continue; 2249 } 2250 /* 2251 * Local and remote magics equal -- loopback? 2252 */ 2253 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2254 printf ("%s: loopback\n", 2255 ifp->if_xname); 2256 sp->pp_loopcnt = 0; 2257 if (ifp->if_flags & IFF_UP) { 2258 if_down(ifp); 2259 IF_PURGE(&sp->pp_cpq); 2260 /* XXX ? */ 2261 lcp.Down(sp); 2262 lcp.Up(sp); 2263 } 2264 } else if (debug) 2265 addlog(" [glitch]"); 2266 ++sp->pp_loopcnt; 2267 /* 2268 * We negate our magic here, and NAK it. If 2269 * we see it later in an NAK packet, we 2270 * suggest a new one. 2271 */ 2272 nmagic = ~sp->lcp.magic; 2273 /* Gonna NAK it. */ 2274 p[2] = nmagic >> 24; 2275 p[3] = nmagic >> 16; 2276 p[4] = nmagic >> 8; 2277 p[5] = nmagic; 2278 break; 2279 2280 case LCP_OPT_ASYNC_MAP: 2281 /* 2282 * Async control character map -- just ignore it. 2283 * 2284 * Quote from RFC 1662, chapter 6: 2285 * To enable this functionality, synchronous PPP 2286 * implementations MUST always respond to the 2287 * Async-Control-Character-Map Configuration 2288 * Option with the LCP Configure-Ack. However, 2289 * acceptance of the Configuration Option does 2290 * not imply that the synchronous implementation 2291 * will do any ACCM mapping. Instead, all such 2292 * octet mapping will be performed by the 2293 * asynchronous-to-synchronous converter. 2294 */ 2295 continue; 2296 2297 case LCP_OPT_MRU: 2298 /* 2299 * Maximum receive unit. Always agreeable, 2300 * but ignored by now. 2301 */ 2302 sp->lcp.their_mru = p[2] * 256 + p[3]; 2303 if (debug) 2304 addlog(" %ld", sp->lcp.their_mru); 2305 continue; 2306 2307 case LCP_OPT_AUTH_PROTO: 2308 authproto = (p[2] << 8) + p[3]; 2309 if (sp->myauth.proto != authproto) { 2310 /* not agreed, nak */ 2311 if (debug) 2312 addlog(" [mine %s != his %s]", 2313 sppp_proto_name(sp->myauth.proto), 2314 sppp_proto_name(authproto)); 2315 p[2] = sp->myauth.proto >> 8; 2316 p[3] = sp->myauth.proto; 2317 break; 2318 } 2319 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2320 if (debug) 2321 addlog(" [chap not MD5]"); 2322 p[4] = CHAP_MD5; 2323 break; 2324 } 2325 continue; 2326 } 2327 /* Add the option to nak'ed list. */ 2328 bcopy (p, r, p[1]); 2329 r += p[1]; 2330 rlen += p[1]; 2331 } 2332 if (rlen) { 2333 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2334 if (debug) 2335 addlog(" max_failure (%d) exceeded, " 2336 "send conf-rej\n", 2337 sp->lcp.max_failure); 2338 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2339 } else { 2340 if (debug) 2341 addlog(" send conf-nak\n"); 2342 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2343 } 2344 goto end; 2345 } else { 2346 if (debug) 2347 addlog(" send conf-ack\n"); 2348 sp->fail_counter[IDX_LCP] = 0; 2349 sp->pp_loopcnt = 0; 2350 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2351 } 2352 2353 end: 2354 free(buf, M_TEMP); 2355 return (rlen == 0); 2356 } 2357 2358 /* 2359 * Analyze the LCP Configure-Reject option list, and adjust our 2360 * negotiation. 2361 */ 2362 static void 2363 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2364 { 2365 STDDCL; 2366 u_char *buf, *p; 2367 2368 len -= 4; 2369 buf = malloc (len, M_TEMP, M_NOWAIT); 2370 if (!buf) 2371 return; 2372 2373 if (debug) 2374 log(LOG_DEBUG, "%s: lcp rej opts:", 2375 ifp->if_xname); 2376 2377 p = (void *)(h + 1); 2378 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2379 if (debug) 2380 addlog(" %s", sppp_lcp_opt_name(*p)); 2381 switch (*p) { 2382 case LCP_OPT_MAGIC: 2383 /* Magic number -- can't use it, use 0 */ 2384 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2385 sp->lcp.magic = 0; 2386 break; 2387 case LCP_OPT_MRU: 2388 /* 2389 * Should not be rejected anyway, since we only 2390 * negotiate a MRU if explicitly requested by 2391 * peer. 2392 */ 2393 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2394 break; 2395 case LCP_OPT_AUTH_PROTO: 2396 /* 2397 * Peer doesn't want to authenticate himself, 2398 * deny unless this is a dialout call, and 2399 * SPPP_AUTHFLAG_NOCALLOUT is set. 2400 */ 2401 if ((sp->pp_flags & PP_CALLIN) == 0 && 2402 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2403 if (debug) 2404 addlog(" [don't insist on auth " 2405 "for callout]"); 2406 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2407 break; 2408 } 2409 if (debug) 2410 addlog("[access denied]\n"); 2411 lcp.Close(sp); 2412 break; 2413 } 2414 } 2415 if (debug) 2416 addlog("\n"); 2417 free(buf, M_TEMP); 2418 return; 2419 } 2420 2421 /* 2422 * Analyze the LCP Configure-NAK option list, and adjust our 2423 * negotiation. 2424 */ 2425 static void 2426 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2427 { 2428 STDDCL; 2429 u_char *buf, *p; 2430 u_int32_t magic; 2431 2432 len -= 4; 2433 buf = malloc (len, M_TEMP, M_NOWAIT); 2434 if (!buf) 2435 return; 2436 2437 if (debug) 2438 log(LOG_DEBUG, "%s: lcp nak opts:", 2439 ifp->if_xname); 2440 2441 p = (void *)(h + 1); 2442 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2443 if (debug) 2444 addlog(" %s", sppp_lcp_opt_name(*p)); 2445 switch (*p) { 2446 case LCP_OPT_MAGIC: 2447 /* Magic number -- renegotiate */ 2448 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2449 len >= 6 && p[1] == 6) { 2450 magic = (u_int32_t)p[2] << 24 | 2451 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2452 /* 2453 * If the remote magic is our negated one, 2454 * this looks like a loopback problem. 2455 * Suggest a new magic to make sure. 2456 */ 2457 if (magic == ~sp->lcp.magic) { 2458 if (debug) 2459 addlog(" magic glitch"); 2460 sp->lcp.magic = arc4random(); 2461 } else { 2462 sp->lcp.magic = magic; 2463 if (debug) 2464 addlog(" %d", magic); 2465 } 2466 } 2467 break; 2468 case LCP_OPT_MRU: 2469 /* 2470 * Peer wants to advise us to negotiate an MRU. 2471 * Agree on it if it's reasonable, or use 2472 * default otherwise. 2473 */ 2474 if (len >= 4 && p[1] == 4) { 2475 u_int mru = p[2] * 256 + p[3]; 2476 if (debug) 2477 addlog(" %d", mru); 2478 if (mru < PP_MTU || mru > PP_MAX_MRU) 2479 mru = PP_MTU; 2480 sp->lcp.mru = mru; 2481 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2482 } 2483 break; 2484 case LCP_OPT_AUTH_PROTO: 2485 /* 2486 * Peer doesn't like our authentication method, 2487 * deny. 2488 */ 2489 if (debug) 2490 addlog("[access denied]\n"); 2491 lcp.Close(sp); 2492 break; 2493 } 2494 } 2495 if (debug) 2496 addlog("\n"); 2497 free(buf, M_TEMP); 2498 return; 2499 } 2500 2501 static void 2502 sppp_lcp_tlu(struct sppp *sp) 2503 { 2504 STDDCL; 2505 int i; 2506 u_int32_t mask; 2507 2508 /* XXX ? */ 2509 if (! (ifp->if_flags & IFF_UP) && 2510 (ifp->if_flags & IFF_RUNNING)) { 2511 /* Coming out of loopback mode. */ 2512 if_up(ifp); 2513 } 2514 2515 for (i = 0; i < IDX_COUNT; i++) 2516 if ((cps[i])->flags & CP_QUAL) 2517 (cps[i])->Open(sp); 2518 2519 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2520 (sp->pp_flags & PP_NEEDAUTH) != 0) 2521 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2522 else 2523 sp->pp_phase = SPPP_PHASE_NETWORK; 2524 2525 if (debug) 2526 { 2527 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2528 sppp_phase_name(sp->pp_phase)); 2529 } 2530 2531 /* 2532 * Open all authentication protocols. This is even required 2533 * if we already proceeded to network phase, since it might be 2534 * that remote wants us to authenticate, so we might have to 2535 * send a PAP request. Undesired authentication protocols 2536 * don't do anything when they get an Open event. 2537 */ 2538 for (i = 0; i < IDX_COUNT; i++) 2539 if ((cps[i])->flags & CP_AUTH) 2540 (cps[i])->Open(sp); 2541 2542 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2543 /* Notify all NCPs. */ 2544 for (i = 0; i < IDX_COUNT; i++) 2545 if ((cps[i])->flags & CP_NCP) 2546 (cps[i])->Open(sp); 2547 } 2548 2549 /* Send Up events to all started protos. */ 2550 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2551 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2552 (cps[i])->Up(sp); 2553 2554 /* notify low-level driver of state change */ 2555 if (sp->pp_chg) 2556 sp->pp_chg(sp, (int)sp->pp_phase); 2557 2558 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2559 /* if no NCP is starting, close down */ 2560 sppp_lcp_check_and_close(sp); 2561 } 2562 2563 static void 2564 sppp_lcp_tld(struct sppp *sp) 2565 { 2566 STDDCL; 2567 int i; 2568 u_int32_t mask; 2569 2570 sp->pp_phase = SPPP_PHASE_TERMINATE; 2571 2572 if (debug) 2573 { 2574 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2575 sppp_phase_name(sp->pp_phase)); 2576 } 2577 2578 /* 2579 * Take upper layers down. We send the Down event first and 2580 * the Close second to prevent the upper layers from sending 2581 * ``a flurry of terminate-request packets'', as the RFC 2582 * describes it. 2583 */ 2584 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2585 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2586 (cps[i])->Down(sp); 2587 (cps[i])->Close(sp); 2588 } 2589 } 2590 2591 static void 2592 sppp_lcp_tls(struct sppp *sp) 2593 { 2594 STDDCL; 2595 2596 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2597 printf("%s: authentication failed %d times, not retrying again\n", 2598 sp->pp_if.if_xname, sp->pp_auth_failures); 2599 if_down(&sp->pp_if); 2600 return; 2601 } 2602 2603 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2604 2605 if (debug) 2606 { 2607 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2608 sppp_phase_name(sp->pp_phase)); 2609 } 2610 2611 /* Notify lower layer if desired. */ 2612 if (sp->pp_tls) 2613 (sp->pp_tls)(sp); 2614 } 2615 2616 static void 2617 sppp_lcp_tlf(struct sppp *sp) 2618 { 2619 STDDCL; 2620 2621 sp->pp_phase = SPPP_PHASE_DEAD; 2622 2623 if (debug) 2624 { 2625 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2626 sppp_phase_name(sp->pp_phase)); 2627 } 2628 2629 /* Notify lower layer if desired. */ 2630 if (sp->pp_tlf) 2631 (sp->pp_tlf)(sp); 2632 } 2633 2634 static void 2635 sppp_lcp_scr(struct sppp *sp) 2636 { 2637 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2638 int i = 0; 2639 u_short authproto; 2640 2641 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2642 if (! sp->lcp.magic) 2643 sp->lcp.magic = arc4random(); 2644 opt[i++] = LCP_OPT_MAGIC; 2645 opt[i++] = 6; 2646 opt[i++] = sp->lcp.magic >> 24; 2647 opt[i++] = sp->lcp.magic >> 16; 2648 opt[i++] = sp->lcp.magic >> 8; 2649 opt[i++] = sp->lcp.magic; 2650 } 2651 2652 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2653 opt[i++] = LCP_OPT_MRU; 2654 opt[i++] = 4; 2655 opt[i++] = sp->lcp.mru >> 8; 2656 opt[i++] = sp->lcp.mru; 2657 } 2658 2659 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2660 authproto = sp->hisauth.proto; 2661 opt[i++] = LCP_OPT_AUTH_PROTO; 2662 opt[i++] = authproto == PPP_CHAP? 5: 4; 2663 opt[i++] = authproto >> 8; 2664 opt[i++] = authproto; 2665 if (authproto == PPP_CHAP) 2666 opt[i++] = CHAP_MD5; 2667 } 2668 2669 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2670 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2671 } 2672 2673 /* 2674 * Check the open NCPs, return true if at least one NCP is open. 2675 */ 2676 static int 2677 sppp_ncp_check(struct sppp *sp) 2678 { 2679 int i, mask; 2680 2681 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2682 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2683 return 1; 2684 return 0; 2685 } 2686 2687 /* 2688 * Re-check the open NCPs and see if we should terminate the link. 2689 * Called by the NCPs during their tlf action handling. 2690 */ 2691 static void 2692 sppp_lcp_check_and_close(struct sppp *sp) 2693 { 2694 2695 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2696 /* don't bother, we are already going down */ 2697 return; 2698 2699 if (sppp_ncp_check(sp)) 2700 return; 2701 2702 lcp.Close(sp); 2703 } 2704 2705 2706 /* 2707 *--------------------------------------------------------------------------* 2708 * * 2709 * The IPCP implementation. * 2710 * * 2711 *--------------------------------------------------------------------------* 2712 */ 2713 2714 static void 2715 sppp_ipcp_init(struct sppp *sp) 2716 { 2717 sp->ipcp.opts = 0; 2718 sp->ipcp.flags = 0; 2719 sp->state[IDX_IPCP] = STATE_INITIAL; 2720 sp->fail_counter[IDX_IPCP] = 0; 2721 sp->pp_seq[IDX_IPCP] = 0; 2722 sp->pp_rseq[IDX_IPCP] = 0; 2723 callout_init(&sp->ch[IDX_IPCP]); 2724 } 2725 2726 static void 2727 sppp_ipcp_up(struct sppp *sp) 2728 { 2729 sppp_up_event(&ipcp, sp); 2730 } 2731 2732 static void 2733 sppp_ipcp_down(struct sppp *sp) 2734 { 2735 sppp_down_event(&ipcp, sp); 2736 } 2737 2738 static void 2739 sppp_ipcp_open(struct sppp *sp) 2740 { 2741 STDDCL; 2742 u_int32_t myaddr, hisaddr; 2743 2744 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2745 sp->ipcp.req_myaddr = 0; 2746 sp->ipcp.req_hisaddr = 0; 2747 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2748 2749 #ifdef INET 2750 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2751 #else 2752 myaddr = hisaddr = 0; 2753 #endif 2754 /* 2755 * If we don't have his address, this probably means our 2756 * interface doesn't want to talk IP at all. (This could 2757 * be the case if somebody wants to speak only IPX, for 2758 * example.) Don't open IPCP in this case. 2759 */ 2760 if (hisaddr == 0) { 2761 /* XXX this message should go away */ 2762 if (debug) 2763 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2764 ifp->if_xname); 2765 return; 2766 } 2767 2768 if (myaddr == 0) { 2769 /* 2770 * I don't have an assigned address, so i need to 2771 * negotiate my address. 2772 */ 2773 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2774 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2775 } 2776 if (hisaddr == 1) { 2777 /* 2778 * XXX - remove this hack! 2779 * remote has no valid address, we need to get one assigned. 2780 */ 2781 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2782 } 2783 sppp_open_event(&ipcp, sp); 2784 } 2785 2786 static void 2787 sppp_ipcp_close(struct sppp *sp) 2788 { 2789 STDDCL; 2790 2791 sppp_close_event(&ipcp, sp); 2792 #ifdef INET 2793 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2794 /* 2795 * Some address was dynamic, clear it again. 2796 */ 2797 sppp_clear_ip_addrs(sp); 2798 #endif 2799 2800 if (sp->pp_saved_mtu > 0) { 2801 ifp->if_mtu = sp->pp_saved_mtu; 2802 sp->pp_saved_mtu = 0; 2803 if (debug) 2804 log(LOG_DEBUG, 2805 "%s: resetting MTU to %" PRIu64 " bytes\n", 2806 ifp->if_xname, ifp->if_mtu); 2807 } 2808 } 2809 2810 static void 2811 sppp_ipcp_TO(void *cookie) 2812 { 2813 sppp_to_event(&ipcp, (struct sppp *)cookie); 2814 } 2815 2816 /* 2817 * Analyze a configure request. Return true if it was agreeable, and 2818 * caused action sca, false if it has been rejected or nak'ed, and 2819 * caused action scn. (The return value is used to make the state 2820 * transition decision in the state automaton.) 2821 */ 2822 static int 2823 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2824 { 2825 u_char *buf, *r, *p; 2826 struct ifnet *ifp = &sp->pp_if; 2827 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2828 u_int32_t hisaddr, desiredaddr; 2829 2830 len -= 4; 2831 origlen = len; 2832 /* 2833 * Make sure to allocate a buf that can at least hold a 2834 * conf-nak with an `address' option. We might need it below. 2835 */ 2836 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2837 if (! buf) 2838 return (0); 2839 2840 /* pass 1: see if we can recognize them */ 2841 if (debug) 2842 log(LOG_DEBUG, "%s: ipcp parse opts:", 2843 ifp->if_xname); 2844 p = (void *)(h + 1); 2845 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2846 if (debug) 2847 addlog(" %s", sppp_ipcp_opt_name(*p)); 2848 switch (*p) { 2849 #ifdef notyet 2850 case IPCP_OPT_COMPRESSION: 2851 if (len >= 6 && p[1] >= 6) { 2852 /* correctly formed compress option */ 2853 continue; 2854 } 2855 if (debug) 2856 addlog(" [invalid]"); 2857 break; 2858 #endif 2859 case IPCP_OPT_ADDRESS: 2860 if (len >= 6 && p[1] == 6) { 2861 /* correctly formed address option */ 2862 continue; 2863 } 2864 if (debug) 2865 addlog(" [invalid]"); 2866 break; 2867 default: 2868 /* Others not supported. */ 2869 if (debug) 2870 addlog(" [rej]"); 2871 break; 2872 } 2873 /* Add the option to rejected list. */ 2874 bcopy (p, r, p[1]); 2875 r += p[1]; 2876 rlen += p[1]; 2877 } 2878 if (rlen) { 2879 if (debug) 2880 addlog(" send conf-rej\n"); 2881 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2882 goto end; 2883 } else if (debug) 2884 addlog("\n"); 2885 2886 /* pass 2: parse option values */ 2887 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2888 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2889 else 2890 #ifdef INET 2891 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2892 #else 2893 hisaddr = 0; 2894 #endif 2895 if (debug) 2896 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2897 ifp->if_xname); 2898 p = (void *)(h + 1); 2899 len = origlen; 2900 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2901 if (debug) 2902 addlog(" %s", sppp_ipcp_opt_name(*p)); 2903 switch (*p) { 2904 #ifdef notyet 2905 case IPCP_OPT_COMPRESSION: 2906 continue; 2907 #endif 2908 case IPCP_OPT_ADDRESS: 2909 desiredaddr = p[2] << 24 | p[3] << 16 | 2910 p[4] << 8 | p[5]; 2911 if (desiredaddr == hisaddr || 2912 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2913 /* 2914 * Peer's address is same as our value, 2915 * this is agreeable. Gonna conf-ack 2916 * it. 2917 */ 2918 if (debug) 2919 addlog(" %s [ack]", 2920 sppp_dotted_quad(hisaddr)); 2921 /* record that we've seen it already */ 2922 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2923 sp->ipcp.req_hisaddr = desiredaddr; 2924 hisaddr = desiredaddr; 2925 continue; 2926 } 2927 /* 2928 * The address wasn't agreeable. This is either 2929 * he sent us 0.0.0.0, asking to assign him an 2930 * address, or he send us another address not 2931 * matching our value. Either case, we gonna 2932 * conf-nak it with our value. 2933 */ 2934 if (debug) { 2935 if (desiredaddr == 0) 2936 addlog(" [addr requested]"); 2937 else 2938 addlog(" %s [not agreed]", 2939 sppp_dotted_quad(desiredaddr)); 2940 } 2941 2942 p[2] = hisaddr >> 24; 2943 p[3] = hisaddr >> 16; 2944 p[4] = hisaddr >> 8; 2945 p[5] = hisaddr; 2946 break; 2947 } 2948 /* Add the option to nak'ed list. */ 2949 bcopy (p, r, p[1]); 2950 r += p[1]; 2951 rlen += p[1]; 2952 } 2953 2954 /* 2955 * If we are about to conf-ack the request, but haven't seen 2956 * his address so far, gonna conf-nak it instead, with the 2957 * `address' option present and our idea of his address being 2958 * filled in there, to request negotiation of both addresses. 2959 * 2960 * XXX This can result in an endless req - nak loop if peer 2961 * doesn't want to send us his address. Q: What should we do 2962 * about it? XXX A: implement the max-failure counter. 2963 */ 2964 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2965 buf[0] = IPCP_OPT_ADDRESS; 2966 buf[1] = 6; 2967 buf[2] = hisaddr >> 24; 2968 buf[3] = hisaddr >> 16; 2969 buf[4] = hisaddr >> 8; 2970 buf[5] = hisaddr; 2971 rlen = 6; 2972 if (debug) 2973 addlog(" still need hisaddr"); 2974 } 2975 2976 if (rlen) { 2977 if (debug) 2978 addlog(" send conf-nak\n"); 2979 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2980 } else { 2981 if (debug) 2982 addlog(" send conf-ack\n"); 2983 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2984 } 2985 2986 end: 2987 free(buf, M_TEMP); 2988 return (rlen == 0); 2989 } 2990 2991 /* 2992 * Analyze the IPCP Configure-Reject option list, and adjust our 2993 * negotiation. 2994 */ 2995 static void 2996 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2997 { 2998 u_char *buf, *p; 2999 struct ifnet *ifp = &sp->pp_if; 3000 int debug = ifp->if_flags & IFF_DEBUG; 3001 3002 len -= 4; 3003 buf = malloc (len, M_TEMP, M_NOWAIT); 3004 if (!buf) 3005 return; 3006 3007 if (debug) 3008 log(LOG_DEBUG, "%s: ipcp rej opts:", 3009 ifp->if_xname); 3010 3011 p = (void *)(h + 1); 3012 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3013 if (debug) 3014 addlog(" %s", sppp_ipcp_opt_name(*p)); 3015 switch (*p) { 3016 case IPCP_OPT_ADDRESS: 3017 /* 3018 * Peer doesn't grok address option. This is 3019 * bad. XXX Should we better give up here? 3020 */ 3021 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3022 break; 3023 #ifdef notyet 3024 case IPCP_OPT_COMPRESS: 3025 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3026 break; 3027 #endif 3028 } 3029 } 3030 if (debug) 3031 addlog("\n"); 3032 free(buf, M_TEMP); 3033 return; 3034 } 3035 3036 /* 3037 * Analyze the IPCP Configure-NAK option list, and adjust our 3038 * negotiation. 3039 */ 3040 static void 3041 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3042 { 3043 u_char *p; 3044 struct ifnet *ifp = &sp->pp_if; 3045 int debug = ifp->if_flags & IFF_DEBUG; 3046 u_int32_t wantaddr; 3047 3048 len -= 4; 3049 3050 if (debug) 3051 log(LOG_DEBUG, "%s: ipcp nak opts:", 3052 ifp->if_xname); 3053 3054 p = (void *)(h + 1); 3055 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3056 if (debug) 3057 addlog(" %s", sppp_ipcp_opt_name(*p)); 3058 switch (*p) { 3059 case IPCP_OPT_ADDRESS: 3060 /* 3061 * Peer doesn't like our local IP address. See 3062 * if we can do something for him. We'll drop 3063 * him our address then. 3064 */ 3065 if (len >= 6 && p[1] == 6) { 3066 wantaddr = p[2] << 24 | p[3] << 16 | 3067 p[4] << 8 | p[5]; 3068 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3069 if (debug) 3070 addlog(" [wantaddr %s]", 3071 sppp_dotted_quad(wantaddr)); 3072 /* 3073 * When doing dynamic address assignment, 3074 * we accept his offer. Otherwise, we 3075 * ignore it and thus continue to negotiate 3076 * our already existing value. 3077 */ 3078 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3079 if (debug) 3080 addlog(" [agree]"); 3081 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3082 sp->ipcp.req_myaddr = wantaddr; 3083 } 3084 } 3085 break; 3086 3087 case IPCP_OPT_PRIMDNS: 3088 if (len >= 6 && p[1] == 6) { 3089 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3090 p[4] << 8 | p[5]; 3091 } 3092 break; 3093 3094 case IPCP_OPT_SECDNS: 3095 if (len >= 6 && p[1] == 6) { 3096 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3097 p[4] << 8 | p[5]; 3098 } 3099 break; 3100 #ifdef notyet 3101 case IPCP_OPT_COMPRESS: 3102 /* 3103 * Peer wants different compression parameters. 3104 */ 3105 break; 3106 #endif 3107 } 3108 } 3109 if (debug) 3110 addlog("\n"); 3111 return; 3112 } 3113 3114 static void 3115 sppp_ipcp_tlu(struct sppp *sp) 3116 { 3117 #ifdef INET 3118 /* we are up. Set addresses and notify anyone interested */ 3119 STDDCL; 3120 u_int32_t myaddr, hisaddr; 3121 3122 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3123 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3124 myaddr = sp->ipcp.req_myaddr; 3125 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3126 hisaddr = sp->ipcp.req_hisaddr; 3127 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3128 3129 if (ifp->if_mtu > sp->lcp.their_mru) { 3130 sp->pp_saved_mtu = ifp->if_mtu; 3131 ifp->if_mtu = sp->lcp.their_mru; 3132 if (debug) 3133 log(LOG_DEBUG, 3134 "%s: setting MTU to %" PRIu64 " bytes\n", 3135 ifp->if_xname, ifp->if_mtu); 3136 } 3137 3138 if (sp->pp_con) 3139 sp->pp_con(sp); 3140 #endif 3141 } 3142 3143 static void 3144 sppp_ipcp_tld(struct sppp *sp) 3145 { 3146 } 3147 3148 static void 3149 sppp_ipcp_tls(struct sppp *sp) 3150 { 3151 /* indicate to LCP that it must stay alive */ 3152 sp->lcp.protos |= (1 << IDX_IPCP); 3153 } 3154 3155 static void 3156 sppp_ipcp_tlf(struct sppp *sp) 3157 { 3158 /* we no longer need LCP */ 3159 sp->lcp.protos &= ~(1 << IDX_IPCP); 3160 } 3161 3162 static void 3163 sppp_ipcp_scr(struct sppp *sp) 3164 { 3165 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3166 #ifdef INET 3167 u_int32_t ouraddr; 3168 #endif 3169 int i = 0; 3170 3171 #ifdef notyet 3172 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3173 opt[i++] = IPCP_OPT_COMPRESSION; 3174 opt[i++] = 6; 3175 opt[i++] = 0; /* VJ header compression */ 3176 opt[i++] = 0x2d; /* VJ header compression */ 3177 opt[i++] = max_slot_id; 3178 opt[i++] = comp_slot_id; 3179 } 3180 #endif 3181 3182 #ifdef INET 3183 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3184 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3185 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3186 else 3187 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3188 opt[i++] = IPCP_OPT_ADDRESS; 3189 opt[i++] = 6; 3190 opt[i++] = ouraddr >> 24; 3191 opt[i++] = ouraddr >> 16; 3192 opt[i++] = ouraddr >> 8; 3193 opt[i++] = ouraddr; 3194 } 3195 #endif 3196 3197 if (sp->query_dns & 1) { 3198 opt[i++] = IPCP_OPT_PRIMDNS; 3199 opt[i++] = 6; 3200 opt[i++] = sp->dns_addrs[0] >> 24; 3201 opt[i++] = sp->dns_addrs[0] >> 16; 3202 opt[i++] = sp->dns_addrs[0] >> 8; 3203 opt[i++] = sp->dns_addrs[0]; 3204 } 3205 if (sp->query_dns & 2) { 3206 opt[i++] = IPCP_OPT_SECDNS; 3207 opt[i++] = 6; 3208 opt[i++] = sp->dns_addrs[1] >> 24; 3209 opt[i++] = sp->dns_addrs[1] >> 16; 3210 opt[i++] = sp->dns_addrs[1] >> 8; 3211 opt[i++] = sp->dns_addrs[1]; 3212 } 3213 3214 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3215 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3216 } 3217 3218 3219 /* 3220 *--------------------------------------------------------------------------* 3221 * * 3222 * The IPv6CP implementation. * 3223 * * 3224 *--------------------------------------------------------------------------* 3225 */ 3226 3227 #ifdef INET6 3228 static void 3229 sppp_ipv6cp_init(struct sppp *sp) 3230 { 3231 sp->ipv6cp.opts = 0; 3232 sp->ipv6cp.flags = 0; 3233 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3234 sp->fail_counter[IDX_IPV6CP] = 0; 3235 sp->pp_seq[IDX_IPV6CP] = 0; 3236 sp->pp_rseq[IDX_IPV6CP] = 0; 3237 callout_init(&sp->ch[IDX_IPV6CP]); 3238 } 3239 3240 static void 3241 sppp_ipv6cp_up(struct sppp *sp) 3242 { 3243 sppp_up_event(&ipv6cp, sp); 3244 } 3245 3246 static void 3247 sppp_ipv6cp_down(struct sppp *sp) 3248 { 3249 sppp_down_event(&ipv6cp, sp); 3250 } 3251 3252 static void 3253 sppp_ipv6cp_open(struct sppp *sp) 3254 { 3255 STDDCL; 3256 struct in6_addr myaddr, hisaddr; 3257 3258 #ifdef IPV6CP_MYIFID_DYN 3259 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3260 #else 3261 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3262 #endif 3263 3264 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3265 /* 3266 * If we don't have our address, this probably means our 3267 * interface doesn't want to talk IPv6 at all. (This could 3268 * be the case if somebody wants to speak only IPX, for 3269 * example.) Don't open IPv6CP in this case. 3270 */ 3271 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3272 /* XXX this message should go away */ 3273 if (debug) 3274 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3275 ifp->if_xname); 3276 return; 3277 } 3278 3279 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3280 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3281 sppp_open_event(&ipv6cp, sp); 3282 } 3283 3284 static void 3285 sppp_ipv6cp_close(struct sppp *sp) 3286 { 3287 sppp_close_event(&ipv6cp, sp); 3288 } 3289 3290 static void 3291 sppp_ipv6cp_TO(void *cookie) 3292 { 3293 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3294 } 3295 3296 /* 3297 * Analyze a configure request. Return true if it was agreeable, and 3298 * caused action sca, false if it has been rejected or nak'ed, and 3299 * caused action scn. (The return value is used to make the state 3300 * transition decision in the state automaton.) 3301 */ 3302 static int 3303 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3304 { 3305 u_char *buf, *r, *p; 3306 struct ifnet *ifp = &sp->pp_if; 3307 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3308 struct in6_addr myaddr, desiredaddr, suggestaddr; 3309 int ifidcount; 3310 int type; 3311 int collision, nohisaddr; 3312 3313 len -= 4; 3314 origlen = len; 3315 /* 3316 * Make sure to allocate a buf that can at least hold a 3317 * conf-nak with an `address' option. We might need it below. 3318 */ 3319 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3320 if (! buf) 3321 return (0); 3322 3323 /* pass 1: see if we can recognize them */ 3324 if (debug) 3325 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3326 ifp->if_xname); 3327 p = (void *)(h + 1); 3328 ifidcount = 0; 3329 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3330 if (debug) 3331 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3332 switch (*p) { 3333 case IPV6CP_OPT_IFID: 3334 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3335 /* correctly formed address option */ 3336 ifidcount++; 3337 continue; 3338 } 3339 if (debug) 3340 addlog(" [invalid]"); 3341 break; 3342 #ifdef notyet 3343 case IPV6CP_OPT_COMPRESSION: 3344 if (len >= 4 && p[1] >= 4) { 3345 /* correctly formed compress option */ 3346 continue; 3347 } 3348 if (debug) 3349 addlog(" [invalid]"); 3350 break; 3351 #endif 3352 default: 3353 /* Others not supported. */ 3354 if (debug) 3355 addlog(" [rej]"); 3356 break; 3357 } 3358 /* Add the option to rejected list. */ 3359 bcopy (p, r, p[1]); 3360 r += p[1]; 3361 rlen += p[1]; 3362 } 3363 if (rlen) { 3364 if (debug) 3365 addlog(" send conf-rej\n"); 3366 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3367 goto end; 3368 } else if (debug) 3369 addlog("\n"); 3370 3371 /* pass 2: parse option values */ 3372 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3373 if (debug) 3374 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3375 ifp->if_xname); 3376 p = (void *)(h + 1); 3377 len = origlen; 3378 type = CONF_ACK; 3379 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3380 if (debug) 3381 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3382 switch (*p) { 3383 #ifdef notyet 3384 case IPV6CP_OPT_COMPRESSION: 3385 continue; 3386 #endif 3387 case IPV6CP_OPT_IFID: 3388 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3389 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3390 collision = (memcmp(&desiredaddr.s6_addr[8], 3391 &myaddr.s6_addr[8], 8) == 0); 3392 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3393 3394 desiredaddr.s6_addr16[0] = htons(0xfe80); 3395 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3396 3397 if (!collision && !nohisaddr) { 3398 /* no collision, hisaddr known - Conf-Ack */ 3399 type = CONF_ACK; 3400 3401 if (debug) { 3402 addlog(" %s [%s]", 3403 ip6_sprintf(&desiredaddr), 3404 sppp_cp_type_name(type)); 3405 } 3406 continue; 3407 } 3408 3409 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3410 if (collision && nohisaddr) { 3411 /* collision, hisaddr unknown - Conf-Rej */ 3412 type = CONF_REJ; 3413 memset(&p[2], 0, 8); 3414 } else { 3415 /* 3416 * - no collision, hisaddr unknown, or 3417 * - collision, hisaddr known 3418 * Conf-Nak, suggest hisaddr 3419 */ 3420 type = CONF_NAK; 3421 sppp_suggest_ip6_addr(sp, &suggestaddr); 3422 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3423 } 3424 if (debug) 3425 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3426 sppp_cp_type_name(type)); 3427 break; 3428 } 3429 /* Add the option to nak'ed list. */ 3430 bcopy (p, r, p[1]); 3431 r += p[1]; 3432 rlen += p[1]; 3433 } 3434 3435 if (rlen == 0 && type == CONF_ACK) { 3436 if (debug) 3437 addlog(" send %s\n", sppp_cp_type_name(type)); 3438 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3439 } else { 3440 #ifdef notdef 3441 if (type == CONF_ACK) 3442 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3443 #endif 3444 3445 if (debug) { 3446 addlog(" send %s suggest %s\n", 3447 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3448 } 3449 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3450 } 3451 3452 end: 3453 free(buf, M_TEMP); 3454 return (rlen == 0); 3455 } 3456 3457 /* 3458 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3459 * negotiation. 3460 */ 3461 static void 3462 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3463 { 3464 u_char *buf, *p; 3465 struct ifnet *ifp = &sp->pp_if; 3466 int debug = ifp->if_flags & IFF_DEBUG; 3467 3468 len -= 4; 3469 buf = malloc (len, M_TEMP, M_NOWAIT); 3470 if (!buf) 3471 return; 3472 3473 if (debug) 3474 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3475 ifp->if_xname); 3476 3477 p = (void *)(h + 1); 3478 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3479 if (debug) 3480 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3481 switch (*p) { 3482 case IPV6CP_OPT_IFID: 3483 /* 3484 * Peer doesn't grok address option. This is 3485 * bad. XXX Should we better give up here? 3486 */ 3487 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3488 break; 3489 #ifdef notyet 3490 case IPV6CP_OPT_COMPRESS: 3491 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3492 break; 3493 #endif 3494 } 3495 } 3496 if (debug) 3497 addlog("\n"); 3498 free(buf, M_TEMP); 3499 return; 3500 } 3501 3502 /* 3503 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3504 * negotiation. 3505 */ 3506 static void 3507 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3508 { 3509 u_char *buf, *p; 3510 struct ifnet *ifp = &sp->pp_if; 3511 int debug = ifp->if_flags & IFF_DEBUG; 3512 struct in6_addr suggestaddr; 3513 3514 len -= 4; 3515 buf = malloc (len, M_TEMP, M_NOWAIT); 3516 if (!buf) 3517 return; 3518 3519 if (debug) 3520 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3521 ifp->if_xname); 3522 3523 p = (void *)(h + 1); 3524 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3525 if (debug) 3526 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3527 switch (*p) { 3528 case IPV6CP_OPT_IFID: 3529 /* 3530 * Peer doesn't like our local ifid. See 3531 * if we can do something for him. We'll drop 3532 * him our address then. 3533 */ 3534 if (len < 10 || p[1] != 10) 3535 break; 3536 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3537 suggestaddr.s6_addr16[0] = htons(0xfe80); 3538 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3539 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3540 3541 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3542 if (debug) 3543 addlog(" [suggestaddr %s]", 3544 ip6_sprintf(&suggestaddr)); 3545 #ifdef IPV6CP_MYIFID_DYN 3546 /* 3547 * When doing dynamic address assignment, 3548 * we accept his offer. 3549 */ 3550 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3551 struct in6_addr lastsuggest; 3552 /* 3553 * If <suggested myaddr from peer> equals to 3554 * <hisaddr we have suggested last time>, 3555 * we have a collision. generate new random 3556 * ifid. 3557 */ 3558 sppp_suggest_ip6_addr(&lastsuggest); 3559 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3560 lastsuggest)) { 3561 if (debug) 3562 addlog(" [random]"); 3563 sppp_gen_ip6_addr(sp, &suggestaddr); 3564 } 3565 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3566 if (debug) 3567 addlog(" [agree]"); 3568 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3569 } 3570 #else 3571 /* 3572 * Since we do not do dynamic address assignment, 3573 * we ignore it and thus continue to negotiate 3574 * our already existing value. This can possibly 3575 * go into infinite request-reject loop. 3576 * 3577 * This is not likely because we normally use 3578 * ifid based on MAC-address. 3579 * If you have no ethernet card on the node, too bad. 3580 * XXX should we use fail_counter? 3581 */ 3582 #endif 3583 break; 3584 #ifdef notyet 3585 case IPV6CP_OPT_COMPRESS: 3586 /* 3587 * Peer wants different compression parameters. 3588 */ 3589 break; 3590 #endif 3591 } 3592 } 3593 if (debug) 3594 addlog("\n"); 3595 free(buf, M_TEMP); 3596 return; 3597 } 3598 3599 static void 3600 sppp_ipv6cp_tlu(struct sppp *sp) 3601 { 3602 /* we are up - notify isdn daemon */ 3603 if (sp->pp_con) 3604 sp->pp_con(sp); 3605 } 3606 3607 static void 3608 sppp_ipv6cp_tld(struct sppp *sp) 3609 { 3610 } 3611 3612 static void 3613 sppp_ipv6cp_tls(struct sppp *sp) 3614 { 3615 /* indicate to LCP that it must stay alive */ 3616 sp->lcp.protos |= (1 << IDX_IPV6CP); 3617 } 3618 3619 static void 3620 sppp_ipv6cp_tlf(struct sppp *sp) 3621 { 3622 /* we no longer need LCP */ 3623 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3624 } 3625 3626 static void 3627 sppp_ipv6cp_scr(struct sppp *sp) 3628 { 3629 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3630 struct in6_addr ouraddr; 3631 int i = 0; 3632 3633 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3634 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3635 opt[i++] = IPV6CP_OPT_IFID; 3636 opt[i++] = 10; 3637 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3638 i += 8; 3639 } 3640 3641 #ifdef notyet 3642 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3643 opt[i++] = IPV6CP_OPT_COMPRESSION; 3644 opt[i++] = 4; 3645 opt[i++] = 0; /* TBD */ 3646 opt[i++] = 0; /* TBD */ 3647 /* variable length data may follow */ 3648 } 3649 #endif 3650 3651 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3652 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3653 } 3654 #else /*INET6*/ 3655 static void sppp_ipv6cp_init(struct sppp *sp) 3656 { 3657 } 3658 3659 static void sppp_ipv6cp_up(struct sppp *sp) 3660 { 3661 } 3662 3663 static void sppp_ipv6cp_down(struct sppp *sp) 3664 { 3665 } 3666 3667 3668 static void sppp_ipv6cp_open(struct sppp *sp) 3669 { 3670 } 3671 3672 static void sppp_ipv6cp_close(struct sppp *sp) 3673 { 3674 } 3675 3676 static void sppp_ipv6cp_TO(void *sp) 3677 { 3678 } 3679 3680 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3681 { 3682 return 0; 3683 } 3684 3685 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3686 { 3687 } 3688 3689 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3690 { 3691 } 3692 3693 static void sppp_ipv6cp_tlu(struct sppp *sp) 3694 { 3695 } 3696 3697 static void sppp_ipv6cp_tld(struct sppp *sp) 3698 { 3699 } 3700 3701 static void sppp_ipv6cp_tls(struct sppp *sp) 3702 { 3703 } 3704 3705 static void sppp_ipv6cp_tlf(struct sppp *sp) 3706 { 3707 } 3708 3709 static void sppp_ipv6cp_scr(struct sppp *sp) 3710 { 3711 } 3712 #endif /*INET6*/ 3713 3714 3715 /* 3716 *--------------------------------------------------------------------------* 3717 * * 3718 * The CHAP implementation. * 3719 * * 3720 *--------------------------------------------------------------------------* 3721 */ 3722 3723 /* 3724 * The authentication protocols don't employ a full-fledged state machine as 3725 * the control protocols do, since they do have Open and Close events, but 3726 * not Up and Down, nor are they explicitly terminated. Also, use of the 3727 * authentication protocols may be different in both directions (this makes 3728 * sense, think of a machine that never accepts incoming calls but only 3729 * calls out, it doesn't require the called party to authenticate itself). 3730 * 3731 * Our state machine for the local authentication protocol (we are requesting 3732 * the peer to authenticate) looks like: 3733 * 3734 * RCA- 3735 * +--------------------------------------------+ 3736 * V scn,tld| 3737 * +--------+ Close +---------+ RCA+ 3738 * | |<----------------------------------| |------+ 3739 * +--->| Closed | TO* | Opened | sca | 3740 * | | |-----+ +-------| |<-----+ 3741 * | +--------+ irc | | +---------+ 3742 * | ^ | | ^ 3743 * | | | | | 3744 * | | | | | 3745 * | TO-| | | | 3746 * | |tld TO+ V | | 3747 * | | +------->+ | | 3748 * | | | | | | 3749 * | +--------+ V | | 3750 * | | |<----+<--------------------+ | 3751 * | | Req- | scr | 3752 * | | Sent | | 3753 * | | | | 3754 * | +--------+ | 3755 * | RCA- | | RCA+ | 3756 * +------+ +------------------------------------------+ 3757 * scn,tld sca,irc,ict,tlu 3758 * 3759 * 3760 * with: 3761 * 3762 * Open: LCP reached authentication phase 3763 * Close: LCP reached terminate phase 3764 * 3765 * RCA+: received reply (pap-req, chap-response), acceptable 3766 * RCN: received reply (pap-req, chap-response), not acceptable 3767 * TO+: timeout with restart counter >= 0 3768 * TO-: timeout with restart counter < 0 3769 * TO*: reschedule timeout for CHAP 3770 * 3771 * scr: send request packet (none for PAP, chap-challenge) 3772 * sca: send ack packet (pap-ack, chap-success) 3773 * scn: send nak packet (pap-nak, chap-failure) 3774 * ict: initialize re-challenge timer (CHAP only) 3775 * 3776 * tlu: this-layer-up, LCP reaches network phase 3777 * tld: this-layer-down, LCP enters terminate phase 3778 * 3779 * Note that in CHAP mode, after sending a new challenge, while the state 3780 * automaton falls back into Req-Sent state, it doesn't signal a tld 3781 * event to LCP, so LCP remains in network phase. Only after not getting 3782 * any response (or after getting an unacceptable response), CHAP closes, 3783 * causing LCP to enter terminate phase. 3784 * 3785 * With PAP, there is no initial request that can be sent. The peer is 3786 * expected to send one based on the successful negotiation of PAP as 3787 * the authentication protocol during the LCP option negotiation. 3788 * 3789 * Incoming authentication protocol requests (remote requests 3790 * authentication, we are peer) don't employ a state machine at all, 3791 * they are simply answered. Some peers [Ascend P50 firmware rev 3792 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3793 * still in authentication phase (thereby violating the standard that 3794 * demands that these NCP packets are to be discarded), so we keep 3795 * track of the peer demanding us to authenticate, and only proceed to 3796 * phase network once we've seen a positive acknowledge for the 3797 * authentication. 3798 */ 3799 3800 /* 3801 * Handle incoming CHAP packets. 3802 */ 3803 void 3804 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3805 { 3806 STDDCL; 3807 struct lcp_header *h; 3808 int len, x; 3809 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3810 int value_len, name_len; 3811 MD5_CTX ctx; 3812 3813 len = m->m_pkthdr.len; 3814 if (len < 4) { 3815 if (debug) 3816 log(LOG_DEBUG, 3817 "%s: chap invalid packet length: %d bytes\n", 3818 ifp->if_xname, len); 3819 return; 3820 } 3821 h = mtod(m, struct lcp_header *); 3822 if (len > ntohs(h->len)) 3823 len = ntohs(h->len); 3824 3825 switch (h->type) { 3826 /* challenge, failure and success are his authproto */ 3827 case CHAP_CHALLENGE: 3828 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3829 /* can't do anything usefull */ 3830 sp->pp_auth_failures++; 3831 printf("%s: chap input without my name and my secret being set\n", 3832 ifp->if_xname); 3833 break; 3834 } 3835 value = 1 + (u_char *)(h + 1); 3836 value_len = value[-1]; 3837 name = value + value_len; 3838 name_len = len - value_len - 5; 3839 if (name_len < 0) { 3840 if (debug) { 3841 log(LOG_DEBUG, 3842 "%s: chap corrupted challenge " 3843 "<%s id=0x%x len=%d", 3844 ifp->if_xname, 3845 sppp_auth_type_name(PPP_CHAP, h->type), 3846 h->ident, ntohs(h->len)); 3847 if (len > 4) 3848 sppp_print_bytes((u_char *)(h + 1), 3849 len - 4); 3850 addlog(">\n"); 3851 } 3852 break; 3853 } 3854 3855 if (debug) { 3856 log(LOG_DEBUG, 3857 "%s: chap input <%s id=0x%x len=%d name=", 3858 ifp->if_xname, 3859 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3860 ntohs(h->len)); 3861 sppp_print_string((char *) name, name_len); 3862 addlog(" value-size=%d value=", value_len); 3863 sppp_print_bytes(value, value_len); 3864 addlog(">\n"); 3865 } 3866 3867 /* Compute reply value. */ 3868 MD5Init(&ctx); 3869 MD5Update(&ctx, &h->ident, 1); 3870 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3871 MD5Update(&ctx, value, value_len); 3872 MD5Final(digest, &ctx); 3873 dsize = sizeof digest; 3874 3875 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3876 sizeof dsize, (const char *)&dsize, 3877 sizeof digest, digest, 3878 sp->myauth.name_len, 3879 sp->myauth.name, 3880 0); 3881 break; 3882 3883 case CHAP_SUCCESS: 3884 if (debug) { 3885 log(LOG_DEBUG, "%s: chap success", 3886 ifp->if_xname); 3887 if (len > 4) { 3888 addlog(": "); 3889 sppp_print_string((char *)(h + 1), len - 4); 3890 } 3891 addlog("\n"); 3892 } 3893 x = splnet(); 3894 sp->pp_auth_failures = 0; 3895 sp->pp_flags &= ~PP_NEEDAUTH; 3896 if (sp->myauth.proto == PPP_CHAP && 3897 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3898 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3899 /* 3900 * We are authenticator for CHAP but didn't 3901 * complete yet. Leave it to tlu to proceed 3902 * to network phase. 3903 */ 3904 splx(x); 3905 break; 3906 } 3907 splx(x); 3908 sppp_phase_network(sp); 3909 break; 3910 3911 case CHAP_FAILURE: 3912 x = splnet(); 3913 sp->pp_auth_failures++; 3914 splx(x); 3915 if (debug) { 3916 log(LOG_INFO, "%s: chap failure", 3917 ifp->if_xname); 3918 if (len > 4) { 3919 addlog(": "); 3920 sppp_print_string((char *)(h + 1), len - 4); 3921 } 3922 addlog("\n"); 3923 } else 3924 log(LOG_INFO, "%s: chap failure\n", 3925 ifp->if_xname); 3926 /* await LCP shutdown by authenticator */ 3927 break; 3928 3929 /* response is my authproto */ 3930 case CHAP_RESPONSE: 3931 if (sp->hisauth.secret == NULL) { 3932 /* can't do anything usefull */ 3933 printf("%s: chap input without his secret being set\n", 3934 ifp->if_xname); 3935 break; 3936 } 3937 value = 1 + (u_char *)(h + 1); 3938 value_len = value[-1]; 3939 name = value + value_len; 3940 name_len = len - value_len - 5; 3941 if (name_len < 0) { 3942 if (debug) { 3943 log(LOG_DEBUG, 3944 "%s: chap corrupted response " 3945 "<%s id=0x%x len=%d", 3946 ifp->if_xname, 3947 sppp_auth_type_name(PPP_CHAP, h->type), 3948 h->ident, ntohs(h->len)); 3949 if (len > 4) 3950 sppp_print_bytes((u_char *)(h + 1), 3951 len - 4); 3952 addlog(">\n"); 3953 } 3954 break; 3955 } 3956 if (h->ident != sp->confid[IDX_CHAP]) { 3957 if (debug) 3958 log(LOG_DEBUG, 3959 "%s: chap dropping response for old ID " 3960 "(got %d, expected %d)\n", 3961 ifp->if_xname, 3962 h->ident, sp->confid[IDX_CHAP]); 3963 break; 3964 } 3965 if (sp->hisauth.name != NULL && 3966 (name_len != sp->hisauth.name_len 3967 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 3968 log(LOG_INFO, "%s: chap response, his name ", 3969 ifp->if_xname); 3970 sppp_print_string(name, name_len); 3971 addlog(" != expected "); 3972 sppp_print_string(sp->hisauth.name, 3973 sp->hisauth.name_len); 3974 addlog("\n"); 3975 goto chap_failure; 3976 } 3977 if (debug) { 3978 log(LOG_DEBUG, "%s: chap input(%s) " 3979 "<%s id=0x%x len=%d name=", 3980 ifp->if_xname, 3981 sppp_state_name(sp->state[IDX_CHAP]), 3982 sppp_auth_type_name(PPP_CHAP, h->type), 3983 h->ident, ntohs(h->len)); 3984 sppp_print_string((char *)name, name_len); 3985 addlog(" value-size=%d value=", value_len); 3986 sppp_print_bytes(value, value_len); 3987 addlog(">\n"); 3988 } 3989 if (value_len != sizeof(sp->myauth.challenge)) { 3990 if (debug) 3991 log(LOG_DEBUG, 3992 "%s: chap bad hash value length: " 3993 "%d bytes, should be %ld\n", 3994 ifp->if_xname, value_len, 3995 (long) sizeof(sp->myauth.challenge)); 3996 goto chap_failure; 3997 } 3998 3999 MD5Init(&ctx); 4000 MD5Update(&ctx, &h->ident, 1); 4001 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4002 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4003 MD5Final(digest, &ctx); 4004 4005 #define FAILMSG "Failed..." 4006 #define SUCCMSG "Welcome!" 4007 4008 if (value_len != sizeof digest || 4009 memcmp(digest, value, value_len) != 0) { 4010 chap_failure: 4011 /* action scn, tld */ 4012 x = splnet(); 4013 sp->pp_auth_failures++; 4014 splx(x); 4015 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4016 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4017 0); 4018 chap.tld(sp); 4019 break; 4020 } 4021 sp->pp_auth_failures = 0; 4022 /* action sca, perhaps tlu */ 4023 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4024 sp->state[IDX_CHAP] == STATE_OPENED) 4025 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4026 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4027 0); 4028 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4029 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4030 chap.tlu(sp); 4031 } 4032 break; 4033 4034 default: 4035 /* Unknown CHAP packet type -- ignore. */ 4036 if (debug) { 4037 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4038 "<0x%x id=0x%xh len=%d", 4039 ifp->if_xname, 4040 sppp_state_name(sp->state[IDX_CHAP]), 4041 h->type, h->ident, ntohs(h->len)); 4042 if (len > 4) 4043 sppp_print_bytes((u_char *)(h + 1), len - 4); 4044 addlog(">\n"); 4045 } 4046 break; 4047 4048 } 4049 } 4050 4051 static void 4052 sppp_chap_init(struct sppp *sp) 4053 { 4054 /* Chap doesn't have STATE_INITIAL at all. */ 4055 sp->state[IDX_CHAP] = STATE_CLOSED; 4056 sp->fail_counter[IDX_CHAP] = 0; 4057 sp->pp_seq[IDX_CHAP] = 0; 4058 sp->pp_rseq[IDX_CHAP] = 0; 4059 callout_init(&sp->ch[IDX_CHAP]); 4060 } 4061 4062 static void 4063 sppp_chap_open(struct sppp *sp) 4064 { 4065 if (sp->myauth.proto == PPP_CHAP && 4066 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4067 /* we are authenticator for CHAP, start it */ 4068 chap.scr(sp); 4069 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4070 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4071 } 4072 /* nothing to be done if we are peer, await a challenge */ 4073 } 4074 4075 static void 4076 sppp_chap_close(struct sppp *sp) 4077 { 4078 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4079 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4080 } 4081 4082 static void 4083 sppp_chap_TO(void *cookie) 4084 { 4085 struct sppp *sp = (struct sppp *)cookie; 4086 STDDCL; 4087 int s; 4088 4089 s = splnet(); 4090 if (debug) 4091 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4092 ifp->if_xname, 4093 sppp_state_name(sp->state[IDX_CHAP]), 4094 sp->rst_counter[IDX_CHAP]); 4095 4096 if (--sp->rst_counter[IDX_CHAP] < 0) 4097 /* TO- event */ 4098 switch (sp->state[IDX_CHAP]) { 4099 case STATE_REQ_SENT: 4100 chap.tld(sp); 4101 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4102 break; 4103 } 4104 else 4105 /* TO+ (or TO*) event */ 4106 switch (sp->state[IDX_CHAP]) { 4107 case STATE_OPENED: 4108 /* TO* event */ 4109 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4110 /* fall through */ 4111 case STATE_REQ_SENT: 4112 chap.scr(sp); 4113 /* sppp_cp_change_state() will restart the timer */ 4114 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4115 break; 4116 } 4117 4118 splx(s); 4119 } 4120 4121 static void 4122 sppp_chap_tlu(struct sppp *sp) 4123 { 4124 STDDCL; 4125 int i, x; 4126 4127 i = 0; 4128 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4129 4130 /* 4131 * Some broken CHAP implementations (Conware CoNet, firmware 4132 * 4.0.?) don't want to re-authenticate their CHAP once the 4133 * initial challenge-response exchange has taken place. 4134 * Provide for an option to avoid rechallenges. 4135 */ 4136 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4137 /* 4138 * Compute the re-challenge timeout. This will yield 4139 * a number between 300 and 810 seconds. 4140 */ 4141 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4142 4143 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4144 } 4145 4146 if (debug) { 4147 log(LOG_DEBUG, 4148 "%s: chap %s, ", 4149 ifp->if_xname, 4150 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4151 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4152 addlog("next re-challenge in %d seconds\n", i); 4153 else 4154 addlog("re-challenging supressed\n"); 4155 } 4156 4157 x = splnet(); 4158 sp->pp_auth_failures = 0; 4159 /* indicate to LCP that we need to be closed down */ 4160 sp->lcp.protos |= (1 << IDX_CHAP); 4161 4162 if (sp->pp_flags & PP_NEEDAUTH) { 4163 /* 4164 * Remote is authenticator, but his auth proto didn't 4165 * complete yet. Defer the transition to network 4166 * phase. 4167 */ 4168 splx(x); 4169 return; 4170 } 4171 splx(x); 4172 4173 /* 4174 * If we are already in phase network, we are done here. This 4175 * is the case if this is a dummy tlu event after a re-challenge. 4176 */ 4177 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4178 sppp_phase_network(sp); 4179 } 4180 4181 static void 4182 sppp_chap_tld(struct sppp *sp) 4183 { 4184 STDDCL; 4185 4186 if (debug) 4187 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4188 callout_stop(&sp->ch[IDX_CHAP]); 4189 sp->lcp.protos &= ~(1 << IDX_CHAP); 4190 4191 lcp.Close(sp); 4192 } 4193 4194 static void 4195 sppp_chap_scr(struct sppp *sp) 4196 { 4197 u_int32_t *ch; 4198 u_char clen; 4199 4200 if (sp->myauth.name == NULL) { 4201 /* can't do anything usefull */ 4202 printf("%s: chap starting without my name being set\n", 4203 sp->pp_if.if_xname); 4204 return; 4205 } 4206 4207 /* Compute random challenge. */ 4208 ch = (u_int32_t *)sp->myauth.challenge; 4209 ch[0] = arc4random(); 4210 ch[1] = arc4random(); 4211 ch[2] = arc4random(); 4212 ch[3] = arc4random(); 4213 clen = 16; /* 4 * sizeof(u_int32_t) */ 4214 4215 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4216 4217 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4218 sizeof clen, (const char *)&clen, 4219 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4220 sp->myauth.name_len, 4221 sp->myauth.name, 4222 0); 4223 } 4224 4225 /* 4226 *--------------------------------------------------------------------------* 4227 * * 4228 * The PAP implementation. * 4229 * * 4230 *--------------------------------------------------------------------------* 4231 */ 4232 /* 4233 * For PAP, we need to keep a little state also if we are the peer, not the 4234 * authenticator. This is since we don't get a request to authenticate, but 4235 * have to repeatedly authenticate ourself until we got a response (or the 4236 * retry counter is expired). 4237 */ 4238 4239 /* 4240 * Handle incoming PAP packets. */ 4241 static void 4242 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4243 { 4244 STDDCL; 4245 struct lcp_header *h; 4246 int len, x; 4247 u_char mlen; 4248 char *name, *secret; 4249 int name_len, secret_len; 4250 4251 len = m->m_pkthdr.len; 4252 if (len < 5) { 4253 if (debug) 4254 log(LOG_DEBUG, 4255 "%s: pap invalid packet length: %d bytes\n", 4256 ifp->if_xname, len); 4257 return; 4258 } 4259 h = mtod(m, struct lcp_header *); 4260 if (len > ntohs(h->len)) 4261 len = ntohs(h->len); 4262 switch (h->type) { 4263 /* PAP request is my authproto */ 4264 case PAP_REQ: 4265 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4266 /* can't do anything usefull */ 4267 printf("%s: pap request without his name and his secret being set\n", 4268 ifp->if_xname); 4269 break; 4270 } 4271 name = 1 + (u_char *)(h + 1); 4272 name_len = name[-1]; 4273 secret = name + name_len + 1; 4274 if (name_len > len - 6 || 4275 (secret_len = secret[-1]) > len - 6 - name_len) { 4276 if (debug) { 4277 log(LOG_DEBUG, "%s: pap corrupted input " 4278 "<%s id=0x%x len=%d", 4279 ifp->if_xname, 4280 sppp_auth_type_name(PPP_PAP, h->type), 4281 h->ident, ntohs(h->len)); 4282 if (len > 4) 4283 sppp_print_bytes((u_char *)(h + 1), 4284 len - 4); 4285 addlog(">\n"); 4286 } 4287 break; 4288 } 4289 if (debug) { 4290 log(LOG_DEBUG, "%s: pap input(%s) " 4291 "<%s id=0x%x len=%d name=", 4292 ifp->if_xname, 4293 sppp_state_name(sp->state[IDX_PAP]), 4294 sppp_auth_type_name(PPP_PAP, h->type), 4295 h->ident, ntohs(h->len)); 4296 sppp_print_string((char *)name, name_len); 4297 addlog(" secret="); 4298 sppp_print_string((char *)secret, secret_len); 4299 addlog(">\n"); 4300 } 4301 if (name_len != sp->hisauth.name_len || 4302 secret_len != sp->hisauth.secret_len || 4303 memcmp(name, sp->hisauth.name, name_len) != 0 || 4304 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4305 /* action scn, tld */ 4306 sp->pp_auth_failures++; 4307 mlen = sizeof(FAILMSG) - 1; 4308 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4309 sizeof mlen, (const char *)&mlen, 4310 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4311 0); 4312 pap.tld(sp); 4313 break; 4314 } 4315 /* action sca, perhaps tlu */ 4316 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4317 sp->state[IDX_PAP] == STATE_OPENED) { 4318 mlen = sizeof(SUCCMSG) - 1; 4319 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4320 sizeof mlen, (const char *)&mlen, 4321 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4322 0); 4323 } 4324 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4325 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4326 pap.tlu(sp); 4327 } 4328 break; 4329 4330 /* ack and nak are his authproto */ 4331 case PAP_ACK: 4332 callout_stop(&sp->pap_my_to_ch); 4333 if (debug) { 4334 log(LOG_DEBUG, "%s: pap success", 4335 ifp->if_xname); 4336 name_len = *(char *)h; 4337 if (len > 5 && name_len) { 4338 addlog(": "); 4339 sppp_print_string((char *)(h + 1), name_len); 4340 } 4341 addlog("\n"); 4342 } 4343 x = splnet(); 4344 sp->pp_auth_failures = 0; 4345 sp->pp_flags &= ~PP_NEEDAUTH; 4346 if (sp->myauth.proto == PPP_PAP && 4347 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4348 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4349 /* 4350 * We are authenticator for PAP but didn't 4351 * complete yet. Leave it to tlu to proceed 4352 * to network phase. 4353 */ 4354 splx(x); 4355 break; 4356 } 4357 splx(x); 4358 sppp_phase_network(sp); 4359 break; 4360 4361 case PAP_NAK: 4362 callout_stop(&sp->pap_my_to_ch); 4363 sp->pp_auth_failures++; 4364 if (debug) { 4365 log(LOG_INFO, "%s: pap failure", 4366 ifp->if_xname); 4367 name_len = *(char *)h; 4368 if (len > 5 && name_len) { 4369 addlog(": "); 4370 sppp_print_string((char *)(h + 1), name_len); 4371 } 4372 addlog("\n"); 4373 } else 4374 log(LOG_INFO, "%s: pap failure\n", 4375 ifp->if_xname); 4376 /* await LCP shutdown by authenticator */ 4377 break; 4378 4379 default: 4380 /* Unknown PAP packet type -- ignore. */ 4381 if (debug) { 4382 log(LOG_DEBUG, "%s: pap corrupted input " 4383 "<0x%x id=0x%x len=%d", 4384 ifp->if_xname, 4385 h->type, h->ident, ntohs(h->len)); 4386 if (len > 4) 4387 sppp_print_bytes((u_char *)(h + 1), len - 4); 4388 addlog(">\n"); 4389 } 4390 break; 4391 4392 } 4393 } 4394 4395 static void 4396 sppp_pap_init(struct sppp *sp) 4397 { 4398 /* PAP doesn't have STATE_INITIAL at all. */ 4399 sp->state[IDX_PAP] = STATE_CLOSED; 4400 sp->fail_counter[IDX_PAP] = 0; 4401 sp->pp_seq[IDX_PAP] = 0; 4402 sp->pp_rseq[IDX_PAP] = 0; 4403 callout_init(&sp->ch[IDX_PAP]); 4404 callout_init(&sp->pap_my_to_ch); 4405 } 4406 4407 static void 4408 sppp_pap_open(struct sppp *sp) 4409 { 4410 if (sp->hisauth.proto == PPP_PAP && 4411 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4412 /* we are authenticator for PAP, start our timer */ 4413 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4414 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4415 } 4416 if (sp->myauth.proto == PPP_PAP) { 4417 /* we are peer, send a request, and start a timer */ 4418 pap.scr(sp); 4419 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4420 sppp_pap_my_TO, sp); 4421 } 4422 } 4423 4424 static void 4425 sppp_pap_close(struct sppp *sp) 4426 { 4427 if (sp->state[IDX_PAP] != STATE_CLOSED) 4428 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4429 } 4430 4431 /* 4432 * That's the timeout routine if we are authenticator. Since the 4433 * authenticator is basically passive in PAP, we can't do much here. 4434 */ 4435 static void 4436 sppp_pap_TO(void *cookie) 4437 { 4438 struct sppp *sp = (struct sppp *)cookie; 4439 STDDCL; 4440 int s; 4441 4442 s = splnet(); 4443 if (debug) 4444 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4445 ifp->if_xname, 4446 sppp_state_name(sp->state[IDX_PAP]), 4447 sp->rst_counter[IDX_PAP]); 4448 4449 if (--sp->rst_counter[IDX_PAP] < 0) 4450 /* TO- event */ 4451 switch (sp->state[IDX_PAP]) { 4452 case STATE_REQ_SENT: 4453 pap.tld(sp); 4454 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4455 break; 4456 } 4457 else 4458 /* TO+ event, not very much we could do */ 4459 switch (sp->state[IDX_PAP]) { 4460 case STATE_REQ_SENT: 4461 /* sppp_cp_change_state() will restart the timer */ 4462 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4463 break; 4464 } 4465 4466 splx(s); 4467 } 4468 4469 /* 4470 * That's the timeout handler if we are peer. Since the peer is active, 4471 * we need to retransmit our PAP request since it is apparently lost. 4472 * XXX We should impose a max counter. 4473 */ 4474 static void 4475 sppp_pap_my_TO(void *cookie) 4476 { 4477 struct sppp *sp = (struct sppp *)cookie; 4478 STDDCL; 4479 4480 if (debug) 4481 log(LOG_DEBUG, "%s: pap peer TO\n", 4482 ifp->if_xname); 4483 4484 pap.scr(sp); 4485 } 4486 4487 static void 4488 sppp_pap_tlu(struct sppp *sp) 4489 { 4490 STDDCL; 4491 int x; 4492 4493 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4494 4495 if (debug) 4496 log(LOG_DEBUG, "%s: %s tlu\n", 4497 ifp->if_xname, pap.name); 4498 4499 x = splnet(); 4500 sp->pp_auth_failures = 0; 4501 /* indicate to LCP that we need to be closed down */ 4502 sp->lcp.protos |= (1 << IDX_PAP); 4503 4504 if (sp->pp_flags & PP_NEEDAUTH) { 4505 /* 4506 * Remote is authenticator, but his auth proto didn't 4507 * complete yet. Defer the transition to network 4508 * phase. 4509 */ 4510 splx(x); 4511 return; 4512 } 4513 splx(x); 4514 sppp_phase_network(sp); 4515 } 4516 4517 static void 4518 sppp_pap_tld(struct sppp *sp) 4519 { 4520 STDDCL; 4521 4522 if (debug) 4523 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4524 callout_stop(&sp->ch[IDX_PAP]); 4525 callout_stop(&sp->pap_my_to_ch); 4526 sp->lcp.protos &= ~(1 << IDX_PAP); 4527 4528 lcp.Close(sp); 4529 } 4530 4531 static void 4532 sppp_pap_scr(struct sppp *sp) 4533 { 4534 u_char idlen, pwdlen; 4535 4536 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4537 /* can't do anything usefull */ 4538 printf("%s: pap starting without my name and secret being set\n", 4539 sp->pp_if.if_xname); 4540 return; 4541 } 4542 4543 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4544 pwdlen = sp->myauth.secret_len; 4545 idlen = sp->myauth.name_len; 4546 4547 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4548 sizeof idlen, (const char *)&idlen, 4549 idlen, sp->myauth.name, 4550 sizeof pwdlen, (const char *)&pwdlen, 4551 pwdlen, sp->myauth.secret, 4552 0); 4553 } 4554 4555 /* 4556 * Random miscellaneous functions. 4557 */ 4558 4559 /* 4560 * Send a PAP or CHAP proto packet. 4561 * 4562 * Varadic function, each of the elements for the ellipsis is of type 4563 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4564 * mlen == 0. 4565 * NOTE: never declare variadic functions with types subject to type 4566 * promotion (i.e. u_char). This is asking for big trouble depending 4567 * on the architecture you are on... 4568 */ 4569 4570 static void 4571 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4572 unsigned int type, unsigned int id, 4573 ...) 4574 { 4575 STDDCL; 4576 struct lcp_header *lh; 4577 struct mbuf *m; 4578 u_char *p; 4579 int len; 4580 size_t pkthdrlen; 4581 unsigned int mlen; 4582 const char *msg; 4583 va_list ap; 4584 4585 MGETHDR(m, M_DONTWAIT, MT_DATA); 4586 if (! m) 4587 return; 4588 m->m_pkthdr.rcvif = 0; 4589 4590 if (sp->pp_flags & PP_NOFRAMING) { 4591 *mtod(m, u_int16_t *) = htons(cp->proto); 4592 pkthdrlen = 2; 4593 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4594 } else { 4595 struct ppp_header *h; 4596 h = mtod(m, struct ppp_header *); 4597 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4598 h->control = PPP_UI; /* Unnumbered Info */ 4599 h->protocol = htons(cp->proto); 4600 pkthdrlen = PPP_HEADER_LEN; 4601 4602 lh = (struct lcp_header *)(h + 1); 4603 } 4604 4605 lh->type = type; 4606 lh->ident = id; 4607 p = (u_char *)(lh + 1); 4608 4609 va_start(ap, id); 4610 len = 0; 4611 4612 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4613 msg = va_arg(ap, const char *); 4614 len += mlen; 4615 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4616 va_end(ap); 4617 m_freem(m); 4618 return; 4619 } 4620 4621 bcopy(msg, p, mlen); 4622 p += mlen; 4623 } 4624 va_end(ap); 4625 4626 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4627 lh->len = htons(LCP_HEADER_LEN + len); 4628 4629 if (debug) { 4630 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4631 ifp->if_xname, cp->name, 4632 sppp_auth_type_name(cp->proto, lh->type), 4633 lh->ident, ntohs(lh->len)); 4634 if (len) 4635 sppp_print_bytes((u_char *)(lh + 1), len); 4636 addlog(">\n"); 4637 } 4638 if (IF_QFULL(&sp->pp_cpq)) { 4639 IF_DROP(&sp->pp_fastq); 4640 IF_DROP(&ifp->if_snd); 4641 m_freem(m); 4642 ++ifp->if_oerrors; 4643 return; 4644 } else 4645 IF_ENQUEUE(&sp->pp_cpq, m); 4646 if (! (ifp->if_flags & IFF_OACTIVE)) 4647 (*ifp->if_start)(ifp); 4648 ifp->if_obytes += m->m_pkthdr.len + 3; 4649 } 4650 4651 /* 4652 * Send keepalive packets, every 10 seconds. 4653 */ 4654 static void 4655 sppp_keepalive(void *dummy) 4656 { 4657 struct sppp *sp; 4658 int s; 4659 time_t now; 4660 4661 s = splnet(); 4662 now = mono_time.tv_sec; 4663 for (sp=spppq; sp; sp=sp->pp_next) { 4664 struct ifnet *ifp = &sp->pp_if; 4665 4666 /* check idle timeout */ 4667 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4668 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4669 /* idle timeout is enabled for this interface */ 4670 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4671 if (ifp->if_flags & IFF_DEBUG) 4672 printf("%s: no activitiy for %lu seconds\n", 4673 sp->pp_if.if_xname, 4674 (unsigned long)(now-sp->pp_last_activity)); 4675 lcp.Close(sp); 4676 continue; 4677 } 4678 } 4679 4680 /* Keepalive mode disabled or channel down? */ 4681 if (! (sp->pp_flags & PP_KEEPALIVE) || 4682 ! (ifp->if_flags & IFF_RUNNING)) 4683 continue; 4684 4685 /* No keepalive in PPP mode if LCP not opened yet. */ 4686 if (! (sp->pp_flags & PP_CISCO) && 4687 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4688 continue; 4689 4690 /* No echo reply, but maybe user data passed through? */ 4691 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4692 sp->pp_alivecnt = 0; 4693 continue; 4694 } 4695 4696 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4697 /* No keepalive packets got. Stop the interface. */ 4698 if_down (ifp); 4699 IF_PURGE(&sp->pp_cpq); 4700 if (! (sp->pp_flags & PP_CISCO)) { 4701 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4702 ifp->if_xname); 4703 sp->pp_alivecnt = 0; 4704 4705 /* we are down, close all open protocols */ 4706 lcp.Close(sp); 4707 4708 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4709 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4710 4711 /* Close connection imediatly, completition of this 4712 * will summon the magic needed to reestablish it. */ 4713 sp->pp_tlf(sp); 4714 continue; 4715 } 4716 } 4717 if (sp->pp_alivecnt < sp->pp_maxalive) 4718 ++sp->pp_alivecnt; 4719 if (sp->pp_flags & PP_CISCO) 4720 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4721 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4722 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4723 int32_t nmagic = htonl(sp->lcp.magic); 4724 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4725 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4726 sp->lcp.echoid, 4, &nmagic); 4727 } 4728 } 4729 splx(s); 4730 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4731 } 4732 4733 #ifdef INET 4734 /* 4735 * Get both IP addresses. 4736 */ 4737 static void 4738 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4739 { 4740 struct ifnet *ifp = &sp->pp_if; 4741 struct ifaddr *ifa; 4742 struct sockaddr_in *si, *sm; 4743 u_int32_t ssrc, ddst; 4744 4745 sm = NULL; 4746 ssrc = ddst = 0; 4747 /* 4748 * Pick the first AF_INET address from the list, 4749 * aliases don't make any sense on a p2p link anyway. 4750 */ 4751 si = 0; 4752 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4753 if (ifa->ifa_addr->sa_family == AF_INET) { 4754 si = (struct sockaddr_in *)ifa->ifa_addr; 4755 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4756 if (si) 4757 break; 4758 } 4759 } 4760 if (ifa) { 4761 if (si && si->sin_addr.s_addr) { 4762 ssrc = si->sin_addr.s_addr; 4763 if (srcmask) 4764 *srcmask = ntohl(sm->sin_addr.s_addr); 4765 } 4766 4767 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4768 if (si && si->sin_addr.s_addr) 4769 ddst = si->sin_addr.s_addr; 4770 } 4771 4772 if (dst) *dst = ntohl(ddst); 4773 if (src) *src = ntohl(ssrc); 4774 } 4775 4776 /* 4777 * Set IP addresses. Must be called at splnet. 4778 * If an address is 0, leave it the way it is. 4779 */ 4780 static void 4781 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4782 { 4783 STDDCL; 4784 struct ifaddr *ifa; 4785 struct sockaddr_in *si, *dest; 4786 4787 /* 4788 * Pick the first AF_INET address from the list, 4789 * aliases don't make any sense on a p2p link anyway. 4790 */ 4791 4792 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4793 if (ifa->ifa_addr->sa_family == AF_INET) { 4794 si = (struct sockaddr_in *)ifa->ifa_addr; 4795 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4796 goto found; 4797 } 4798 } 4799 return; 4800 4801 found: 4802 { 4803 int error; 4804 struct sockaddr_in new_sin = *si; 4805 struct sockaddr_in new_dst = *dest; 4806 4807 /* 4808 * Scrub old routes now instead of calling in_ifinit with 4809 * scrub=1, because we may change the dstaddr 4810 * before the call to in_ifinit. 4811 */ 4812 in_ifscrub(ifp, ifatoia(ifa)); 4813 4814 if (myaddr != 0) 4815 new_sin.sin_addr.s_addr = htonl(myaddr); 4816 if (hisaddr != 0) { 4817 new_dst.sin_addr.s_addr = htonl(hisaddr); 4818 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4819 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4820 *dest = new_dst; /* fix dstaddr in place */ 4821 } 4822 } 4823 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4824 if (debug && error) 4825 { 4826 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4827 " failed, error=%d\n", ifp->if_xname, error); 4828 } 4829 #ifdef PFIL_HOOKS 4830 if (!error) 4831 (void)pfil_run_hooks(&if_pfil, 4832 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4833 #endif 4834 } 4835 } 4836 4837 /* 4838 * Clear IP addresses. Must be called at splnet. 4839 */ 4840 static void 4841 sppp_clear_ip_addrs(struct sppp *sp) 4842 { 4843 struct ifnet *ifp = &sp->pp_if; 4844 struct ifaddr *ifa; 4845 struct sockaddr_in *si, *dest; 4846 4847 u_int32_t remote; 4848 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4849 remote = sp->ipcp.saved_hisaddr; 4850 else 4851 sppp_get_ip_addrs(sp, 0, &remote, 0); 4852 4853 /* 4854 * Pick the first AF_INET address from the list, 4855 * aliases don't make any sense on a p2p link anyway. 4856 */ 4857 4858 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4859 if (ifa->ifa_addr->sa_family == AF_INET) { 4860 si = (struct sockaddr_in *)ifa->ifa_addr; 4861 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4862 goto found; 4863 } 4864 } 4865 return; 4866 4867 found: 4868 { 4869 struct sockaddr_in new_sin = *si; 4870 4871 in_ifscrub(ifp, ifatoia(ifa)); 4872 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4873 new_sin.sin_addr.s_addr = 0; 4874 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4875 /* replace peer addr in place */ 4876 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4877 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4878 #ifdef PFIL_HOOKS 4879 (void)pfil_run_hooks(&if_pfil, 4880 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4881 #endif 4882 } 4883 } 4884 #endif 4885 4886 #ifdef INET6 4887 /* 4888 * Get both IPv6 addresses. 4889 */ 4890 static void 4891 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4892 struct in6_addr *srcmask) 4893 { 4894 struct ifnet *ifp = &sp->pp_if; 4895 struct ifaddr *ifa; 4896 struct sockaddr_in6 *si, *sm; 4897 struct in6_addr ssrc, ddst; 4898 4899 sm = NULL; 4900 memset(&ssrc, 0, sizeof(ssrc)); 4901 memset(&ddst, 0, sizeof(ddst)); 4902 /* 4903 * Pick the first link-local AF_INET6 address from the list, 4904 * aliases don't make any sense on a p2p link anyway. 4905 */ 4906 si = 0; 4907 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4908 if (ifa->ifa_addr->sa_family == AF_INET6) { 4909 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4910 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4911 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4912 break; 4913 } 4914 if (ifa) { 4915 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4916 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4917 if (srcmask) { 4918 bcopy(&sm->sin6_addr, srcmask, 4919 sizeof(*srcmask)); 4920 } 4921 } 4922 4923 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4924 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4925 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4926 } 4927 4928 if (dst) 4929 bcopy(&ddst, dst, sizeof(*dst)); 4930 if (src) 4931 bcopy(&ssrc, src, sizeof(*src)); 4932 } 4933 4934 #ifdef IPV6CP_MYIFID_DYN 4935 /* 4936 * Generate random ifid. 4937 */ 4938 static void 4939 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4940 { 4941 /* TBD */ 4942 } 4943 4944 /* 4945 * Set my IPv6 address. Must be called at splnet. 4946 */ 4947 static void 4948 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4949 { 4950 STDDCL; 4951 struct ifaddr *ifa; 4952 struct sockaddr_in6 *sin6; 4953 4954 /* 4955 * Pick the first link-local AF_INET6 address from the list, 4956 * aliases don't make any sense on a p2p link anyway. 4957 */ 4958 4959 sin6 = NULL; 4960 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4961 { 4962 if (ifa->ifa_addr->sa_family == AF_INET6) 4963 { 4964 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4965 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4966 break; 4967 } 4968 } 4969 4970 if (ifa && sin6) 4971 { 4972 int error; 4973 struct sockaddr_in6 new_sin6 = *sin6; 4974 4975 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4976 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4977 if (debug && error) 4978 { 4979 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 4980 " failed, error=%d\n", ifp->if_xname, error); 4981 } 4982 #ifdef PFIL_HOOKS 4983 if (!error) 4984 (void)pfil_run_hooks(&if_pfil, 4985 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 4986 #endif 4987 } 4988 } 4989 #endif 4990 4991 /* 4992 * Suggest a candidate address to be used by peer. 4993 */ 4994 static void 4995 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4996 { 4997 struct in6_addr myaddr; 4998 struct timeval tv; 4999 5000 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5001 5002 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5003 microtime(&tv); 5004 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5005 myaddr.s6_addr[14] ^= 0xff; 5006 myaddr.s6_addr[15] ^= 0xff; 5007 } else { 5008 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5009 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5010 } 5011 if (suggest) 5012 bcopy(&myaddr, suggest, sizeof(myaddr)); 5013 } 5014 #endif /*INET6*/ 5015 5016 /* 5017 * Process ioctl requests specific to the PPP interface. 5018 * Permissions have already been checked. 5019 */ 5020 static int 5021 sppp_params(struct sppp *sp, int cmd, void *data) 5022 { 5023 switch (cmd) { 5024 case SPPPGETAUTHCFG: 5025 { 5026 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5027 int error; 5028 size_t len; 5029 5030 cfg->myauthflags = sp->myauth.flags; 5031 cfg->hisauthflags = sp->hisauth.flags; 5032 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5033 cfg->hisauth = 0; 5034 if (sp->hisauth.proto) 5035 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5036 cfg->myauth = 0; 5037 if (sp->myauth.proto) 5038 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5039 if (cfg->myname_length == 0) { 5040 if (sp->myauth.name != NULL) 5041 cfg->myname_length = sp->myauth.name_len + 1; 5042 } else { 5043 if (sp->myauth.name == NULL) { 5044 cfg->myname_length = 0; 5045 } else { 5046 len = sp->myauth.name_len + 1; 5047 if (cfg->myname_length < len) 5048 return (ENAMETOOLONG); 5049 error = copyout(sp->myauth.name, cfg->myname, len); 5050 if (error) return error; 5051 } 5052 } 5053 if (cfg->hisname_length == 0) { 5054 if (sp->hisauth.name != NULL) 5055 cfg->hisname_length = sp->hisauth.name_len + 1; 5056 } else { 5057 if (sp->hisauth.name == NULL) { 5058 cfg->hisname_length = 0; 5059 } else { 5060 len = sp->hisauth.name_len + 1; 5061 if (cfg->hisname_length < len) 5062 return (ENAMETOOLONG); 5063 error = copyout(sp->hisauth.name, cfg->hisname, len); 5064 if (error) return error; 5065 } 5066 } 5067 } 5068 break; 5069 case SPPPSETAUTHCFG: 5070 { 5071 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5072 int error; 5073 5074 if (sp->myauth.name) { 5075 free(sp->myauth.name, M_DEVBUF); 5076 sp->myauth.name = NULL; 5077 } 5078 if (sp->myauth.secret) { 5079 free(sp->myauth.secret, M_DEVBUF); 5080 sp->myauth.secret = NULL; 5081 } 5082 if (sp->hisauth.name) { 5083 free(sp->hisauth.name, M_DEVBUF); 5084 sp->hisauth.name = NULL; 5085 } 5086 if (sp->hisauth.secret) { 5087 free(sp->hisauth.secret, M_DEVBUF); 5088 sp->hisauth.secret = NULL; 5089 } 5090 5091 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5092 if (cfg->hisname_length >= MCLBYTES) 5093 return (ENAMETOOLONG); 5094 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5095 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5096 if (error) { 5097 free(sp->hisauth.name, M_DEVBUF); 5098 sp->hisauth.name = NULL; 5099 return error; 5100 } 5101 sp->hisauth.name_len = cfg->hisname_length - 1; 5102 sp->hisauth.name[sp->hisauth.name_len] = 0; 5103 } 5104 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5105 if (cfg->hissecret_length >= MCLBYTES) 5106 return (ENAMETOOLONG); 5107 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5108 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5109 if (error) { 5110 free(sp->hisauth.secret, M_DEVBUF); 5111 sp->hisauth.secret = NULL; 5112 return error; 5113 } 5114 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5115 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5116 } 5117 if (cfg->myname != NULL && cfg->myname_length > 0) { 5118 if (cfg->myname_length >= MCLBYTES) 5119 return (ENAMETOOLONG); 5120 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5121 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5122 if (error) { 5123 free(sp->myauth.name, M_DEVBUF); 5124 sp->myauth.name = NULL; 5125 return error; 5126 } 5127 sp->myauth.name_len = cfg->myname_length - 1; 5128 sp->myauth.name[sp->myauth.name_len] = 0; 5129 } 5130 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5131 if (cfg->mysecret_length >= MCLBYTES) 5132 return (ENAMETOOLONG); 5133 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5134 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5135 if (error) { 5136 free(sp->myauth.secret, M_DEVBUF); 5137 sp->myauth.secret = NULL; 5138 return error; 5139 } 5140 sp->myauth.secret_len = cfg->mysecret_length - 1; 5141 sp->myauth.secret[sp->myauth.secret_len] = 0; 5142 } 5143 sp->myauth.flags = cfg->myauthflags; 5144 if (cfg->myauth) 5145 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5146 sp->hisauth.flags = cfg->hisauthflags; 5147 if (cfg->hisauth) 5148 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5149 sp->pp_auth_failures = 0; 5150 if (sp->hisauth.proto != 0) 5151 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5152 else 5153 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5154 } 5155 break; 5156 case SPPPGETLCPCFG: 5157 { 5158 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5159 lcp->lcp_timeout = sp->lcp.timeout; 5160 } 5161 break; 5162 case SPPPSETLCPCFG: 5163 { 5164 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5165 sp->lcp.timeout = lcp->lcp_timeout; 5166 } 5167 break; 5168 case SPPPGETSTATUS: 5169 { 5170 struct spppstatus *status = (struct spppstatus *)data; 5171 status->phase = sp->pp_phase; 5172 } 5173 break; 5174 case SPPPGETSTATUSNCP: 5175 { 5176 struct spppstatusncp *status = (struct spppstatusncp *)data; 5177 status->phase = sp->pp_phase; 5178 status->ncpup = sppp_ncp_check(sp); 5179 } 5180 break; 5181 case SPPPGETIDLETO: 5182 { 5183 struct spppidletimeout *to = (struct spppidletimeout *)data; 5184 to->idle_seconds = sp->pp_idle_timeout; 5185 } 5186 break; 5187 case SPPPSETIDLETO: 5188 { 5189 struct spppidletimeout *to = (struct spppidletimeout *)data; 5190 sp->pp_idle_timeout = to->idle_seconds; 5191 } 5192 break; 5193 case SPPPSETAUTHFAILURE: 5194 { 5195 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5196 sp->pp_max_auth_fail = afsettings->max_failures; 5197 sp->pp_auth_failures = 0; 5198 } 5199 break; 5200 case SPPPGETAUTHFAILURES: 5201 { 5202 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5203 stats->auth_failures = sp->pp_auth_failures; 5204 stats->max_failures = sp->pp_max_auth_fail; 5205 } 5206 break; 5207 case SPPPSETDNSOPTS: 5208 { 5209 struct spppdnssettings *req = (struct spppdnssettings *)data; 5210 sp->query_dns = req->query_dns & 3; 5211 } 5212 break; 5213 case SPPPGETDNSOPTS: 5214 { 5215 struct spppdnssettings *req = (struct spppdnssettings *)data; 5216 req->query_dns = sp->query_dns; 5217 } 5218 break; 5219 case SPPPGETDNSADDRS: 5220 { 5221 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5222 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5223 } 5224 break; 5225 case SPPPGETKEEPALIVE: 5226 { 5227 struct spppkeepalivesettings *settings = 5228 (struct spppkeepalivesettings*)data; 5229 settings->maxalive = sp->pp_maxalive; 5230 settings->max_noreceive = sp->pp_max_noreceive; 5231 } 5232 break; 5233 case SPPPSETKEEPALIVE: 5234 { 5235 struct spppkeepalivesettings *settings = 5236 (struct spppkeepalivesettings*)data; 5237 sp->pp_maxalive = settings->maxalive; 5238 sp->pp_max_noreceive = settings->max_noreceive; 5239 } 5240 break; 5241 default: 5242 return (EINVAL); 5243 } 5244 5245 return (0); 5246 } 5247 5248 static void 5249 sppp_phase_network(struct sppp *sp) 5250 { 5251 STDDCL; 5252 int i; 5253 u_int32_t mask; 5254 5255 sp->pp_phase = SPPP_PHASE_NETWORK; 5256 5257 if (debug) 5258 { 5259 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5260 sppp_phase_name(sp->pp_phase)); 5261 } 5262 5263 /* Notify NCPs now. */ 5264 for (i = 0; i < IDX_COUNT; i++) 5265 if ((cps[i])->flags & CP_NCP) 5266 (cps[i])->Open(sp); 5267 5268 /* Send Up events to all NCPs. */ 5269 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5270 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5271 (cps[i])->Up(sp); 5272 5273 /* if no NCP is starting, all this was in vain, close down */ 5274 sppp_lcp_check_and_close(sp); 5275 } 5276 5277 5278 static const char * 5279 sppp_cp_type_name(u_char type) 5280 { 5281 static char buf[12]; 5282 switch (type) { 5283 case CONF_REQ: return "conf-req"; 5284 case CONF_ACK: return "conf-ack"; 5285 case CONF_NAK: return "conf-nak"; 5286 case CONF_REJ: return "conf-rej"; 5287 case TERM_REQ: return "term-req"; 5288 case TERM_ACK: return "term-ack"; 5289 case CODE_REJ: return "code-rej"; 5290 case PROTO_REJ: return "proto-rej"; 5291 case ECHO_REQ: return "echo-req"; 5292 case ECHO_REPLY: return "echo-reply"; 5293 case DISC_REQ: return "discard-req"; 5294 } 5295 snprintf(buf, sizeof(buf), "0x%x", type); 5296 return buf; 5297 } 5298 5299 static const char * 5300 sppp_auth_type_name(u_short proto, u_char type) 5301 { 5302 static char buf[12]; 5303 switch (proto) { 5304 case PPP_CHAP: 5305 switch (type) { 5306 case CHAP_CHALLENGE: return "challenge"; 5307 case CHAP_RESPONSE: return "response"; 5308 case CHAP_SUCCESS: return "success"; 5309 case CHAP_FAILURE: return "failure"; 5310 } 5311 case PPP_PAP: 5312 switch (type) { 5313 case PAP_REQ: return "req"; 5314 case PAP_ACK: return "ack"; 5315 case PAP_NAK: return "nak"; 5316 } 5317 } 5318 snprintf(buf, sizeof(buf), "0x%x", type); 5319 return buf; 5320 } 5321 5322 static const char * 5323 sppp_lcp_opt_name(u_char opt) 5324 { 5325 static char buf[12]; 5326 switch (opt) { 5327 case LCP_OPT_MRU: return "mru"; 5328 case LCP_OPT_ASYNC_MAP: return "async-map"; 5329 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5330 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5331 case LCP_OPT_MAGIC: return "magic"; 5332 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5333 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5334 } 5335 snprintf(buf, sizeof(buf), "0x%x", opt); 5336 return buf; 5337 } 5338 5339 static const char * 5340 sppp_ipcp_opt_name(u_char opt) 5341 { 5342 static char buf[12]; 5343 switch (opt) { 5344 case IPCP_OPT_ADDRESSES: return "addresses"; 5345 case IPCP_OPT_COMPRESSION: return "compression"; 5346 case IPCP_OPT_ADDRESS: return "address"; 5347 } 5348 snprintf(buf, sizeof(buf), "0x%x", opt); 5349 return buf; 5350 } 5351 5352 #ifdef INET6 5353 static const char * 5354 sppp_ipv6cp_opt_name(u_char opt) 5355 { 5356 static char buf[12]; 5357 switch (opt) { 5358 case IPV6CP_OPT_IFID: return "ifid"; 5359 case IPV6CP_OPT_COMPRESSION: return "compression"; 5360 } 5361 snprintf(buf, sizeof(buf), "0x%x", opt); 5362 return buf; 5363 } 5364 #endif 5365 5366 static const char * 5367 sppp_state_name(int state) 5368 { 5369 switch (state) { 5370 case STATE_INITIAL: return "initial"; 5371 case STATE_STARTING: return "starting"; 5372 case STATE_CLOSED: return "closed"; 5373 case STATE_STOPPED: return "stopped"; 5374 case STATE_CLOSING: return "closing"; 5375 case STATE_STOPPING: return "stopping"; 5376 case STATE_REQ_SENT: return "req-sent"; 5377 case STATE_ACK_RCVD: return "ack-rcvd"; 5378 case STATE_ACK_SENT: return "ack-sent"; 5379 case STATE_OPENED: return "opened"; 5380 } 5381 return "illegal"; 5382 } 5383 5384 static const char * 5385 sppp_phase_name(int phase) 5386 { 5387 switch (phase) { 5388 case SPPP_PHASE_DEAD: return "dead"; 5389 case SPPP_PHASE_ESTABLISH: return "establish"; 5390 case SPPP_PHASE_TERMINATE: return "terminate"; 5391 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5392 case SPPP_PHASE_NETWORK: return "network"; 5393 } 5394 return "illegal"; 5395 } 5396 5397 static const char * 5398 sppp_proto_name(u_short proto) 5399 { 5400 static char buf[12]; 5401 switch (proto) { 5402 case PPP_LCP: return "lcp"; 5403 case PPP_IPCP: return "ipcp"; 5404 case PPP_PAP: return "pap"; 5405 case PPP_CHAP: return "chap"; 5406 case PPP_IPV6CP: return "ipv6cp"; 5407 } 5408 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5409 return buf; 5410 } 5411 5412 static void 5413 sppp_print_bytes(const u_char *p, u_short len) 5414 { 5415 addlog(" %02x", *p++); 5416 while (--len > 0) 5417 addlog("-%02x", *p++); 5418 } 5419 5420 static void 5421 sppp_print_string(const char *p, u_short len) 5422 { 5423 u_char c; 5424 5425 while (len-- > 0) { 5426 c = *p++; 5427 /* 5428 * Print only ASCII chars directly. RFC 1994 recommends 5429 * using only them, but we don't rely on it. */ 5430 if (c < ' ' || c > '~') 5431 addlog("\\x%x", c); 5432 else 5433 addlog("%c", c); 5434 } 5435 } 5436 5437 static const char * 5438 sppp_dotted_quad(u_int32_t addr) 5439 { 5440 static char s[16]; 5441 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5442 (int)((addr >> 24) & 0xff), 5443 (int)((addr >> 16) & 0xff), 5444 (int)((addr >> 8) & 0xff), 5445 (int)(addr & 0xff)); 5446 return s; 5447 } 5448 5449 /* a dummy, used to drop uninteresting events */ 5450 static void 5451 sppp_null(struct sppp *unused) 5452 { 5453 /* do just nothing */ 5454 } 5455 /* 5456 * This file is large. Tell emacs to highlight it nevertheless. 5457 * 5458 * Local Variables: 5459 * hilit-auto-highlight-maxout: 120000 5460 * End: 5461 */ 5462
Indexes created Fri Sep 26 20:09:58 GMT 2025