if_spppsubr.c revision 1.150
1 /* $NetBSD: if_spppsubr.c,v 1.150 2016/09/14 10:58:38 roy 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 1.150 2016/09/14 10:58:38 roy Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_modular.h" 49 #include "opt_compat_netbsd.h" 50 #endif 51 52 53 #include <sys/param.h> 54 #include <sys/proc.h> 55 #include <sys/systm.h> 56 #include <sys/kernel.h> 57 #include <sys/sockio.h> 58 #include <sys/socket.h> 59 #include <sys/syslog.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/callout.h> 63 #include <sys/md5.h> 64 #include <sys/inttypes.h> 65 #include <sys/kauth.h> 66 #include <sys/cprng.h> 67 #include <sys/module.h> 68 69 #include <net/if.h> 70 #include <net/netisr.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/ppp_defs.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip.h> 80 #include <netinet/tcp.h> 81 #endif 82 #include <net/ethertypes.h> 83 84 #ifdef INET6 85 #include <netinet6/scope6_var.h> 86 #endif 87 88 #include <net/if_sppp.h> 89 #include <net/if_spppvar.h> 90 91 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 92 #define LOOPALIVECNT 3 /* loopback detection tries */ 93 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 94 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 95 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 96 97 /* 98 * Interface flags that can be set in an ifconfig command. 99 * 100 * Setting link0 will make the link passive, i.e. it will be marked 101 * as being administrative openable, but won't be opened to begin 102 * with. Incoming calls will be answered, or subsequent calls with 103 * -link1 will cause the administrative open of the LCP layer. 104 * 105 * Setting link1 will cause the link to auto-dial only as packets 106 * arrive to be sent. 107 * 108 * Setting IFF_DEBUG will syslog the option negotiation and state 109 * transitions at level kern.debug. Note: all logs consistently look 110 * like 111 * 112 * <if-name><unit>: <proto-name> <additional info...> 113 * 114 * with <if-name><unit> being something like "bppp0", and <proto-name> 115 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 116 */ 117 118 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 119 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 120 121 #define CONF_REQ 1 /* PPP configure request */ 122 #define CONF_ACK 2 /* PPP configure acknowledge */ 123 #define CONF_NAK 3 /* PPP configure negative ack */ 124 #define CONF_REJ 4 /* PPP configure reject */ 125 #define TERM_REQ 5 /* PPP terminate request */ 126 #define TERM_ACK 6 /* PPP terminate acknowledge */ 127 #define CODE_REJ 7 /* PPP code reject */ 128 #define PROTO_REJ 8 /* PPP protocol reject */ 129 #define ECHO_REQ 9 /* PPP echo request */ 130 #define ECHO_REPLY 10 /* PPP echo reply */ 131 #define DISC_REQ 11 /* PPP discard request */ 132 133 #define LCP_OPT_MRU 1 /* maximum receive unit */ 134 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 135 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 136 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 137 #define LCP_OPT_MAGIC 5 /* magic number */ 138 #define LCP_OPT_RESERVED 6 /* reserved */ 139 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 140 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 141 142 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 143 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 144 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 145 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 146 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 147 148 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 149 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 150 151 #define PAP_REQ 1 /* PAP name/password request */ 152 #define PAP_ACK 2 /* PAP acknowledge */ 153 #define PAP_NAK 3 /* PAP fail */ 154 155 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 156 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 157 #define CHAP_SUCCESS 3 /* CHAP response ok */ 158 #define CHAP_FAILURE 4 /* CHAP response failed */ 159 160 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 161 162 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 163 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 164 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 165 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 166 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 167 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 168 169 /* states are named and numbered according to RFC 1661 */ 170 #define STATE_INITIAL 0 171 #define STATE_STARTING 1 172 #define STATE_CLOSED 2 173 #define STATE_STOPPED 3 174 #define STATE_CLOSING 4 175 #define STATE_STOPPING 5 176 #define STATE_REQ_SENT 6 177 #define STATE_ACK_RCVD 7 178 #define STATE_ACK_SENT 8 179 #define STATE_OPENED 9 180 181 struct ppp_header { 182 uint8_t address; 183 uint8_t control; 184 uint16_t protocol; 185 } __packed; 186 #define PPP_HEADER_LEN sizeof (struct ppp_header) 187 188 struct lcp_header { 189 uint8_t type; 190 uint8_t ident; 191 uint16_t len; 192 } __packed; 193 #define LCP_HEADER_LEN sizeof (struct lcp_header) 194 195 struct cisco_packet { 196 uint32_t type; 197 uint32_t par1; 198 uint32_t par2; 199 uint16_t rel; 200 uint16_t time0; 201 uint16_t time1; 202 } __packed; 203 #define CISCO_PACKET_LEN 18 204 205 /* 206 * We follow the spelling and capitalization of RFC 1661 here, to make 207 * it easier comparing with the standard. Please refer to this RFC in 208 * case you can't make sense out of these abbreviation; it will also 209 * explain the semantics related to the various events and actions. 210 */ 211 struct cp { 212 u_short proto; /* PPP control protocol number */ 213 u_char protoidx; /* index into state table in struct sppp */ 214 u_char flags; 215 #define CP_LCP 0x01 /* this is the LCP */ 216 #define CP_AUTH 0x02 /* this is an authentication protocol */ 217 #define CP_NCP 0x04 /* this is a NCP */ 218 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 219 const char *name; /* name of this control protocol */ 220 /* event handlers */ 221 void (*Up)(struct sppp *sp); 222 void (*Down)(struct sppp *sp); 223 void (*Open)(struct sppp *sp); 224 void (*Close)(struct sppp *sp); 225 void (*TO)(void *sp); 226 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 227 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 228 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 229 /* actions */ 230 void (*tlu)(struct sppp *sp); 231 void (*tld)(struct sppp *sp); 232 void (*tls)(struct sppp *sp); 233 void (*tlf)(struct sppp *sp); 234 void (*scr)(struct sppp *sp); 235 }; 236 237 static struct sppp *spppq; 238 static callout_t keepalive_ch; 239 240 #ifdef INET 241 /* 242 * The following disgusting hack gets around the problem that IP TOS 243 * can't be set yet. We want to put "interactive" traffic on a high 244 * priority queue. To decide if traffic is interactive, we check that 245 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 246 * 247 * XXX is this really still necessary? - joerg - 248 */ 249 static u_short interactive_ports[8] = { 250 0, 513, 0, 0, 251 0, 21, 0, 23, 252 }; 253 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 254 #endif 255 256 /* almost every function needs these */ 257 #define STDDCL \ 258 struct ifnet *ifp = &sp->pp_if; \ 259 int debug = ifp->if_flags & IFF_DEBUG 260 261 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 262 const struct sockaddr *dst, const struct rtentry *rt); 263 264 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 265 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 266 267 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 268 struct mbuf *m); 269 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 270 u_char ident, u_short len, void *data); 271 /* static void sppp_cp_timeout(void *arg); */ 272 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 273 int newstate); 274 static void sppp_auth_send(const struct cp *cp, 275 struct sppp *sp, unsigned int type, unsigned int id, 276 ...); 277 278 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 279 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 280 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 281 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 282 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 283 284 static void sppp_null(struct sppp *sp); 285 286 static void sppp_lcp_init(struct sppp *sp); 287 static void sppp_lcp_up(struct sppp *sp); 288 static void sppp_lcp_down(struct sppp *sp); 289 static void sppp_lcp_open(struct sppp *sp); 290 static void sppp_lcp_close(struct sppp *sp); 291 static void sppp_lcp_TO(void *sp); 292 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 293 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 294 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 295 static void sppp_lcp_tlu(struct sppp *sp); 296 static void sppp_lcp_tld(struct sppp *sp); 297 static void sppp_lcp_tls(struct sppp *sp); 298 static void sppp_lcp_tlf(struct sppp *sp); 299 static void sppp_lcp_scr(struct sppp *sp); 300 static void sppp_lcp_check_and_close(struct sppp *sp); 301 static int sppp_ncp_check(struct sppp *sp); 302 303 static void sppp_ipcp_init(struct sppp *sp); 304 static void sppp_ipcp_up(struct sppp *sp); 305 static void sppp_ipcp_down(struct sppp *sp); 306 static void sppp_ipcp_open(struct sppp *sp); 307 static void sppp_ipcp_close(struct sppp *sp); 308 static void sppp_ipcp_TO(void *sp); 309 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 312 static void sppp_ipcp_tlu(struct sppp *sp); 313 static void sppp_ipcp_tld(struct sppp *sp); 314 static void sppp_ipcp_tls(struct sppp *sp); 315 static void sppp_ipcp_tlf(struct sppp *sp); 316 static void sppp_ipcp_scr(struct sppp *sp); 317 318 static void sppp_ipv6cp_init(struct sppp *sp); 319 static void sppp_ipv6cp_up(struct sppp *sp); 320 static void sppp_ipv6cp_down(struct sppp *sp); 321 static void sppp_ipv6cp_open(struct sppp *sp); 322 static void sppp_ipv6cp_close(struct sppp *sp); 323 static void sppp_ipv6cp_TO(void *sp); 324 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 325 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 327 static void sppp_ipv6cp_tlu(struct sppp *sp); 328 static void sppp_ipv6cp_tld(struct sppp *sp); 329 static void sppp_ipv6cp_tls(struct sppp *sp); 330 static void sppp_ipv6cp_tlf(struct sppp *sp); 331 static void sppp_ipv6cp_scr(struct sppp *sp); 332 333 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 334 static void sppp_pap_init(struct sppp *sp); 335 static void sppp_pap_open(struct sppp *sp); 336 static void sppp_pap_close(struct sppp *sp); 337 static void sppp_pap_TO(void *sp); 338 static void sppp_pap_my_TO(void *sp); 339 static void sppp_pap_tlu(struct sppp *sp); 340 static void sppp_pap_tld(struct sppp *sp); 341 static void sppp_pap_scr(struct sppp *sp); 342 343 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 344 static void sppp_chap_init(struct sppp *sp); 345 static void sppp_chap_open(struct sppp *sp); 346 static void sppp_chap_close(struct sppp *sp); 347 static void sppp_chap_TO(void *sp); 348 static void sppp_chap_tlu(struct sppp *sp); 349 static void sppp_chap_tld(struct sppp *sp); 350 static void sppp_chap_scr(struct sppp *sp); 351 352 static const char *sppp_auth_type_name(u_short proto, u_char type); 353 static const char *sppp_cp_type_name(u_char type); 354 static const char *sppp_dotted_quad(uint32_t addr); 355 static const char *sppp_ipcp_opt_name(u_char opt); 356 #ifdef INET6 357 static const char *sppp_ipv6cp_opt_name(u_char opt); 358 #endif 359 static const char *sppp_lcp_opt_name(u_char opt); 360 static const char *sppp_phase_name(int phase); 361 static const char *sppp_proto_name(u_short proto); 362 static const char *sppp_state_name(int state); 363 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 364 #ifdef INET 365 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 366 uint32_t *srcmask); 367 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 368 static void sppp_clear_ip_addrs(struct sppp *sp); 369 #endif 370 static void sppp_keepalive(void *dummy); 371 static void sppp_phase_network(struct sppp *sp); 372 static void sppp_print_bytes(const u_char *p, u_short len); 373 static void sppp_print_string(const char *p, u_short len); 374 #ifdef INET6 375 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 376 struct in6_addr *dst, struct in6_addr *srcmask); 377 #ifdef IPV6CP_MYIFID_DYN 378 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 379 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 380 #endif 381 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 382 #endif 383 384 /* our control protocol descriptors */ 385 static const struct cp lcp = { 386 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 387 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 388 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 389 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 390 sppp_lcp_scr 391 }; 392 393 static const struct cp ipcp = { 394 PPP_IPCP, IDX_IPCP, 395 #ifdef INET 396 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 397 #else 398 0, 399 #endif 400 "ipcp", 401 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 402 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 403 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 404 sppp_ipcp_scr 405 }; 406 407 static const struct cp ipv6cp = { 408 PPP_IPV6CP, IDX_IPV6CP, 409 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 410 CP_NCP, 411 #else 412 0, 413 #endif 414 "ipv6cp", 415 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 416 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 417 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 418 sppp_ipv6cp_scr 419 }; 420 421 static const struct cp pap = { 422 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 423 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 424 sppp_pap_TO, 0, 0, 0, 425 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 426 sppp_pap_scr 427 }; 428 429 static const struct cp chap = { 430 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 431 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 432 sppp_chap_TO, 0, 0, 0, 433 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 434 sppp_chap_scr 435 }; 436 437 static const struct cp *cps[IDX_COUNT] = { 438 &lcp, /* IDX_LCP */ 439 &ipcp, /* IDX_IPCP */ 440 &ipv6cp, /* IDX_IPV6CP */ 441 &pap, /* IDX_PAP */ 442 &chap, /* IDX_CHAP */ 443 }; 444 445 static void 446 sppp_change_phase(struct sppp *sp, int phase) 447 { 448 STDDCL; 449 450 if (sp->pp_phase == phase) 451 return; 452 453 sp->pp_phase = phase; 454 455 if (phase == SPPP_PHASE_NETWORK) 456 if_link_state_change(ifp, LINK_STATE_UP); 457 else 458 if_link_state_change(ifp, LINK_STATE_DOWN); 459 460 if (debug) 461 { 462 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 463 sppp_phase_name(sp->pp_phase)); 464 } 465 } 466 467 /* 468 * Exported functions, comprising our interface to the lower layer. 469 */ 470 471 /* 472 * Process the received packet. 473 */ 474 void 475 sppp_input(struct ifnet *ifp, struct mbuf *m) 476 { 477 struct ppp_header *h = NULL; 478 pktqueue_t *pktq = NULL; 479 struct ifqueue *inq = NULL; 480 uint16_t protocol; 481 int s; 482 struct sppp *sp = (struct sppp *)ifp; 483 int debug = ifp->if_flags & IFF_DEBUG; 484 int isr = 0; 485 486 if (ifp->if_flags & IFF_UP) { 487 /* Count received bytes, add hardware framing */ 488 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 489 /* Note time of last receive */ 490 sp->pp_last_receive = time_uptime; 491 } 492 493 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 494 /* Too small packet, drop it. */ 495 if (debug) 496 log(LOG_DEBUG, 497 "%s: input packet is too small, %d bytes\n", 498 ifp->if_xname, m->m_pkthdr.len); 499 drop: 500 ++ifp->if_ierrors; 501 ++ifp->if_iqdrops; 502 m_freem(m); 503 return; 504 } 505 506 if (sp->pp_flags & PP_NOFRAMING) { 507 memcpy(&protocol, mtod(m, void *), 2); 508 protocol = ntohs(protocol); 509 m_adj(m, 2); 510 } else { 511 512 /* Get PPP header. */ 513 h = mtod(m, struct ppp_header *); 514 m_adj(m, PPP_HEADER_LEN); 515 516 switch (h->address) { 517 case PPP_ALLSTATIONS: 518 if (h->control != PPP_UI) 519 goto invalid; 520 if (sp->pp_flags & PP_CISCO) { 521 if (debug) 522 log(LOG_DEBUG, 523 "%s: PPP packet in Cisco mode " 524 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 525 ifp->if_xname, 526 h->address, h->control, ntohs(h->protocol)); 527 goto drop; 528 } 529 break; 530 case CISCO_MULTICAST: 531 case CISCO_UNICAST: 532 /* Don't check the control field here (RFC 1547). */ 533 if (! (sp->pp_flags & PP_CISCO)) { 534 if (debug) 535 log(LOG_DEBUG, 536 "%s: Cisco packet in PPP mode " 537 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 538 ifp->if_xname, 539 h->address, h->control, ntohs(h->protocol)); 540 goto drop; 541 } 542 switch (ntohs(h->protocol)) { 543 default: 544 ++ifp->if_noproto; 545 goto invalid; 546 case CISCO_KEEPALIVE: 547 sppp_cisco_input((struct sppp *) ifp, m); 548 m_freem(m); 549 return; 550 #ifdef INET 551 case ETHERTYPE_IP: 552 pktq = ip_pktq; 553 break; 554 #endif 555 #ifdef INET6 556 case ETHERTYPE_IPV6: 557 pktq = ip6_pktq; 558 break; 559 #endif 560 } 561 goto queue_pkt; 562 default: /* Invalid PPP packet. */ 563 invalid: 564 if (debug) 565 log(LOG_DEBUG, 566 "%s: invalid input packet " 567 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 568 ifp->if_xname, 569 h->address, h->control, ntohs(h->protocol)); 570 goto drop; 571 } 572 protocol = ntohs(h->protocol); 573 } 574 575 switch (protocol) { 576 default: 577 if (sp->state[IDX_LCP] == STATE_OPENED) { 578 uint16_t prot = htons(protocol); 579 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 580 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 581 &prot); 582 } 583 if (debug) 584 log(LOG_DEBUG, 585 "%s: invalid input protocol " 586 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 587 ++ifp->if_noproto; 588 goto drop; 589 case PPP_LCP: 590 sppp_cp_input(&lcp, sp, m); 591 m_freem(m); 592 return; 593 case PPP_PAP: 594 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 595 sppp_pap_input(sp, m); 596 m_freem(m); 597 return; 598 case PPP_CHAP: 599 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 600 sppp_chap_input(sp, m); 601 m_freem(m); 602 return; 603 #ifdef INET 604 case PPP_IPCP: 605 if (sp->pp_phase == SPPP_PHASE_NETWORK) 606 sppp_cp_input(&ipcp, sp, m); 607 m_freem(m); 608 return; 609 case PPP_IP: 610 if (sp->state[IDX_IPCP] == STATE_OPENED) { 611 sp->pp_last_activity = time_uptime; 612 pktq = ip_pktq; 613 } 614 break; 615 #endif 616 #ifdef INET6 617 case PPP_IPV6CP: 618 if (sp->pp_phase == SPPP_PHASE_NETWORK) 619 sppp_cp_input(&ipv6cp, sp, m); 620 m_freem(m); 621 return; 622 623 case PPP_IPV6: 624 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 625 sp->pp_last_activity = time_uptime; 626 pktq = ip6_pktq; 627 } 628 break; 629 #endif 630 } 631 632 queue_pkt: 633 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 634 goto drop; 635 } 636 637 /* Check queue. */ 638 if (__predict_true(pktq)) { 639 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 640 goto drop; 641 } 642 return; 643 } 644 645 s = splnet(); 646 if (IF_QFULL(inq)) { 647 /* Queue overflow. */ 648 IF_DROP(inq); 649 splx(s); 650 if (debug) 651 log(LOG_DEBUG, "%s: protocol queue overflow\n", 652 ifp->if_xname); 653 goto drop; 654 } 655 IF_ENQUEUE(inq, m); 656 schednetisr(isr); 657 splx(s); 658 } 659 660 /* 661 * Enqueue transmit packet. 662 */ 663 static int 664 sppp_output(struct ifnet *ifp, struct mbuf *m, 665 const struct sockaddr *dst, const struct rtentry *rt) 666 { 667 struct sppp *sp = (struct sppp *) ifp; 668 struct ppp_header *h = NULL; 669 struct ifqueue *ifq = NULL; /* XXX */ 670 int s, error = 0; 671 uint16_t protocol; 672 673 s = splnet(); 674 675 sp->pp_last_activity = time_uptime; 676 677 if ((ifp->if_flags & IFF_UP) == 0 || 678 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 679 m_freem(m); 680 splx(s); 681 return (ENETDOWN); 682 } 683 684 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 685 /* 686 * Interface is not yet running, but auto-dial. Need 687 * to start LCP for it. 688 */ 689 ifp->if_flags |= IFF_RUNNING; 690 splx(s); 691 lcp.Open(sp); 692 s = splnet(); 693 } 694 695 /* 696 * If the queueing discipline needs packet classification, 697 * do it before prepending link headers. 698 */ 699 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 700 701 #ifdef INET 702 if (dst->sa_family == AF_INET) { 703 struct ip *ip = NULL; 704 struct tcphdr *th = NULL; 705 706 if (m->m_len >= sizeof(struct ip)) { 707 ip = mtod(m, struct ip *); 708 if (ip->ip_p == IPPROTO_TCP && 709 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 710 sizeof(struct tcphdr)) { 711 th = (struct tcphdr *) 712 ((char *)ip + (ip->ip_hl << 2)); 713 } 714 } else 715 ip = NULL; 716 717 /* 718 * When using dynamic local IP address assignment by using 719 * 0.0.0.0 as a local address, the first TCP session will 720 * not connect because the local TCP checksum is computed 721 * using 0.0.0.0 which will later become our real IP address 722 * so the TCP checksum computed at the remote end will 723 * become invalid. So we 724 * - don't let packets with src ip addr 0 thru 725 * - we flag TCP packets with src ip 0 as an error 726 */ 727 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 728 uint8_t proto = ip->ip_p; 729 730 m_freem(m); 731 splx(s); 732 if (proto == IPPROTO_TCP) 733 return (EADDRNOTAVAIL); 734 else 735 return (0); 736 } 737 738 /* 739 * Put low delay, telnet, rlogin and ftp control packets 740 * in front of the queue. 741 */ 742 743 if (!IF_QFULL(&sp->pp_fastq) && 744 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 745 (th && (INTERACTIVE(ntohs(th->th_sport)) || 746 INTERACTIVE(ntohs(th->th_dport)))))) 747 ifq = &sp->pp_fastq; 748 } 749 #endif 750 751 #ifdef INET6 752 if (dst->sa_family == AF_INET6) { 753 /* XXX do something tricky here? */ 754 } 755 #endif 756 757 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 758 /* 759 * Prepend general data packet PPP header. For now, IP only. 760 */ 761 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 762 if (! m) { 763 if (ifp->if_flags & IFF_DEBUG) 764 log(LOG_DEBUG, "%s: no memory for transmit header\n", 765 ifp->if_xname); 766 ++ifp->if_oerrors; 767 splx(s); 768 return (ENOBUFS); 769 } 770 /* 771 * May want to check size of packet 772 * (albeit due to the implementation it's always enough) 773 */ 774 h = mtod(m, struct ppp_header *); 775 if (sp->pp_flags & PP_CISCO) { 776 h->address = CISCO_UNICAST; /* unicast address */ 777 h->control = 0; 778 } else { 779 h->address = PPP_ALLSTATIONS; /* broadcast address */ 780 h->control = PPP_UI; /* Unnumbered Info */ 781 } 782 } 783 784 switch (dst->sa_family) { 785 #ifdef INET 786 case AF_INET: /* Internet Protocol */ 787 if (sp->pp_flags & PP_CISCO) 788 protocol = htons(ETHERTYPE_IP); 789 else { 790 /* 791 * Don't choke with an ENETDOWN early. It's 792 * possible that we just started dialing out, 793 * so don't drop the packet immediately. If 794 * we notice that we run out of buffer space 795 * below, we will however remember that we are 796 * not ready to carry IP packets, and return 797 * ENETDOWN, as opposed to ENOBUFS. 798 */ 799 protocol = htons(PPP_IP); 800 if (sp->state[IDX_IPCP] != STATE_OPENED) 801 error = ENETDOWN; 802 } 803 break; 804 #endif 805 #ifdef INET6 806 case AF_INET6: /* Internet Protocol version 6 */ 807 if (sp->pp_flags & PP_CISCO) 808 protocol = htons(ETHERTYPE_IPV6); 809 else { 810 /* 811 * Don't choke with an ENETDOWN early. It's 812 * possible that we just started dialing out, 813 * so don't drop the packet immediately. If 814 * we notice that we run out of buffer space 815 * below, we will however remember that we are 816 * not ready to carry IP packets, and return 817 * ENETDOWN, as opposed to ENOBUFS. 818 */ 819 protocol = htons(PPP_IPV6); 820 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 821 error = ENETDOWN; 822 } 823 break; 824 #endif 825 default: 826 m_freem(m); 827 ++ifp->if_oerrors; 828 splx(s); 829 return (EAFNOSUPPORT); 830 } 831 832 if (sp->pp_flags & PP_NOFRAMING) { 833 M_PREPEND(m, 2, M_DONTWAIT); 834 if (m == NULL) { 835 if (ifp->if_flags & IFF_DEBUG) 836 log(LOG_DEBUG, "%s: no memory for transmit header\n", 837 ifp->if_xname); 838 ++ifp->if_oerrors; 839 splx(s); 840 return (ENOBUFS); 841 } 842 *mtod(m, uint16_t *) = protocol; 843 } else { 844 h->protocol = protocol; 845 } 846 847 848 error = ifq_enqueue2(ifp, ifq, m); 849 850 if (error == 0) { 851 /* 852 * Count output packets and bytes. 853 * The packet length includes header + additional hardware 854 * framing according to RFC 1333. 855 */ 856 if (!(ifp->if_flags & IFF_OACTIVE)) 857 if_start_lock(ifp); 858 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 859 } 860 splx(s); 861 return error; 862 } 863 864 static int 865 sppp_mediachange(struct ifnet *ifp) 866 { 867 868 return (0); 869 } 870 871 static void 872 sppp_mediastatus(struct ifnet *ifp, struct ifmediareq *imr) 873 { 874 875 switch (ifp->if_link_state) { 876 case LINK_STATE_UP: 877 imr->ifm_status = IFM_AVALID | IFM_ACTIVE; 878 break; 879 case LINK_STATE_DOWN: 880 imr->ifm_status = IFM_AVALID; 881 break; 882 default: 883 /* Should be impossible as we set link state down in attach. */ 884 imr->ifm_status = 0; 885 break; 886 } 887 } 888 889 void 890 sppp_attach(struct ifnet *ifp) 891 { 892 struct sppp *sp = (struct sppp *) ifp; 893 894 /* Initialize keepalive handler. */ 895 if (! spppq) { 896 callout_init(&keepalive_ch, 0); 897 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 898 } 899 900 /* Insert new entry into the keepalive list. */ 901 sp->pp_next = spppq; 902 spppq = sp; 903 904 sp->pp_if.if_type = IFT_PPP; 905 sp->pp_if.if_output = sppp_output; 906 sp->pp_fastq.ifq_maxlen = 32; 907 sp->pp_cpq.ifq_maxlen = 20; 908 sp->pp_loopcnt = 0; 909 sp->pp_alivecnt = 0; 910 sp->pp_last_activity = 0; 911 sp->pp_last_receive = 0; 912 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 913 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 914 sp->pp_idle_timeout = 0; 915 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 916 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 917 sp->pp_auth_failures = 0; 918 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 919 sp->pp_phase = SPPP_PHASE_DEAD; 920 sp->pp_up = lcp.Up; 921 sp->pp_down = lcp.Down; 922 923 if_alloc_sadl(ifp); 924 925 /* Lets not beat about the bush, we know we're down. */ 926 ifp->if_link_state = LINK_STATE_DOWN; 927 /* There is no media for PPP, but it's needed to report link status. */ 928 ifmedia_init(&sp->pp_im, 0, sppp_mediachange, sppp_mediastatus); 929 930 memset(&sp->myauth, 0, sizeof sp->myauth); 931 memset(&sp->hisauth, 0, sizeof sp->hisauth); 932 sppp_lcp_init(sp); 933 sppp_ipcp_init(sp); 934 sppp_ipv6cp_init(sp); 935 sppp_pap_init(sp); 936 sppp_chap_init(sp); 937 } 938 939 void 940 sppp_detach(struct ifnet *ifp) 941 { 942 struct sppp **q, *p, *sp = (struct sppp *) ifp; 943 944 /* Remove the entry from the keepalive list. */ 945 for (q = &spppq; (p = *q); q = &p->pp_next) 946 if (p == sp) { 947 *q = p->pp_next; 948 break; 949 } 950 951 /* Stop keepalive handler. */ 952 if (! spppq) { 953 callout_stop(&keepalive_ch); 954 } 955 956 callout_stop(&sp->ch[IDX_LCP]); 957 callout_stop(&sp->ch[IDX_IPCP]); 958 callout_stop(&sp->ch[IDX_PAP]); 959 callout_stop(&sp->ch[IDX_CHAP]); 960 #ifdef INET6 961 callout_stop(&sp->ch[IDX_IPV6CP]); 962 #endif 963 callout_stop(&sp->pap_my_to_ch); 964 965 /* free authentication info */ 966 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 967 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 968 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 969 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 970 } 971 972 /* 973 * Flush the interface output queue. 974 */ 975 void 976 sppp_flush(struct ifnet *ifp) 977 { 978 struct sppp *sp = (struct sppp *) ifp; 979 980 IFQ_PURGE(&sp->pp_if.if_snd); 981 IF_PURGE(&sp->pp_fastq); 982 IF_PURGE(&sp->pp_cpq); 983 } 984 985 /* 986 * Check if the output queue is empty. 987 */ 988 int 989 sppp_isempty(struct ifnet *ifp) 990 { 991 struct sppp *sp = (struct sppp *) ifp; 992 int empty, s; 993 994 s = splnet(); 995 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 996 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 997 splx(s); 998 return (empty); 999 } 1000 1001 /* 1002 * Get next packet to send. 1003 */ 1004 struct mbuf * 1005 sppp_dequeue(struct ifnet *ifp) 1006 { 1007 struct sppp *sp = (struct sppp *) ifp; 1008 struct mbuf *m; 1009 int s; 1010 1011 s = splnet(); 1012 /* 1013 * Process only the control protocol queue until we have at 1014 * least one NCP open. 1015 * 1016 * Do always serve all three queues in Cisco mode. 1017 */ 1018 IF_DEQUEUE(&sp->pp_cpq, m); 1019 if (m == NULL && 1020 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1021 IF_DEQUEUE(&sp->pp_fastq, m); 1022 if (m == NULL) 1023 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1024 } 1025 splx(s); 1026 return m; 1027 } 1028 1029 /* 1030 * Process an ioctl request. Called on low priority level. 1031 */ 1032 int 1033 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1034 { 1035 struct lwp *l = curlwp; /* XXX */ 1036 struct ifreq *ifr = (struct ifreq *) data; 1037 struct ifaddr *ifa = (struct ifaddr *) data; 1038 struct sppp *sp = (struct sppp *) ifp; 1039 int s, error=0, going_up, going_down, newmode; 1040 1041 s = splnet(); 1042 switch (cmd) { 1043 case SIOCINITIFADDR: 1044 ifa->ifa_rtrequest = p2p_rtrequest; 1045 break; 1046 1047 case SIOCSIFFLAGS: 1048 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1049 break; 1050 going_up = ifp->if_flags & IFF_UP && 1051 (ifp->if_flags & IFF_RUNNING) == 0; 1052 going_down = (ifp->if_flags & IFF_UP) == 0 && 1053 ifp->if_flags & IFF_RUNNING; 1054 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1055 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1056 /* sanity */ 1057 newmode = IFF_PASSIVE; 1058 ifp->if_flags &= ~IFF_AUTO; 1059 } 1060 1061 if (going_up || going_down) 1062 lcp.Close(sp); 1063 if (going_up && newmode == 0) { 1064 /* neither auto-dial nor passive */ 1065 ifp->if_flags |= IFF_RUNNING; 1066 if (!(sp->pp_flags & PP_CISCO)) 1067 lcp.Open(sp); 1068 } else if (going_down) { 1069 sppp_flush(ifp); 1070 ifp->if_flags &= ~IFF_RUNNING; 1071 } 1072 1073 break; 1074 1075 case SIOCSIFMTU: 1076 if (ifr->ifr_mtu < PPP_MINMRU || 1077 ifr->ifr_mtu > sp->lcp.their_mru) { 1078 error = EINVAL; 1079 break; 1080 } 1081 /*FALLTHROUGH*/ 1082 case SIOCGIFMTU: 1083 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1084 error = 0; 1085 break; 1086 case SIOCADDMULTI: 1087 case SIOCDELMULTI: 1088 break; 1089 1090 case SPPPSETAUTHCFG: 1091 case SPPPSETLCPCFG: 1092 case SPPPSETIDLETO: 1093 case SPPPSETAUTHFAILURE: 1094 case SPPPSETDNSOPTS: 1095 case SPPPSETKEEPALIVE: 1096 #if defined(COMPAT_50) || defined(MODULAR) 1097 case __SPPPSETIDLETO50: 1098 case __SPPPSETKEEPALIVE50: 1099 #endif /* COMPAT_50 || MODULAR */ 1100 error = kauth_authorize_network(l->l_cred, 1101 KAUTH_NETWORK_INTERFACE, 1102 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1103 NULL); 1104 if (error) 1105 break; 1106 error = sppp_params(sp, cmd, data); 1107 break; 1108 1109 case SPPPGETAUTHCFG: 1110 case SPPPGETLCPCFG: 1111 case SPPPGETAUTHFAILURES: 1112 error = kauth_authorize_network(l->l_cred, 1113 KAUTH_NETWORK_INTERFACE, 1114 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1115 NULL); 1116 if (error) 1117 break; 1118 error = sppp_params(sp, cmd, data); 1119 break; 1120 1121 case SPPPGETSTATUS: 1122 case SPPPGETSTATUSNCP: 1123 case SPPPGETIDLETO: 1124 case SPPPGETDNSOPTS: 1125 case SPPPGETDNSADDRS: 1126 case SPPPGETKEEPALIVE: 1127 #if defined(COMPAT_50) || defined(MODULAR) 1128 case __SPPPGETIDLETO50: 1129 case __SPPPGETKEEPALIVE50: 1130 #endif /* COMPAT_50 || MODULAR */ 1131 error = sppp_params(sp, cmd, data); 1132 break; 1133 1134 case SIOCGIFMEDIA: 1135 error = ifmedia_ioctl(ifp, ifr, &sp->pp_im, cmd); 1136 break; 1137 1138 default: 1139 error = ifioctl_common(ifp, cmd, data); 1140 break; 1141 } 1142 splx(s); 1143 return (error); 1144 } 1145 1146 1147 /* 1148 * Cisco framing implementation. 1149 */ 1150 1151 /* 1152 * Handle incoming Cisco keepalive protocol packets. 1153 */ 1154 static void 1155 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1156 { 1157 STDDCL; 1158 struct cisco_packet *h; 1159 #ifdef INET 1160 uint32_t me, mymask = 0; /* XXX: GCC */ 1161 #endif 1162 1163 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1164 if (debug) 1165 log(LOG_DEBUG, 1166 "%s: cisco invalid packet length: %d bytes\n", 1167 ifp->if_xname, m->m_pkthdr.len); 1168 return; 1169 } 1170 h = mtod(m, struct cisco_packet *); 1171 if (debug) 1172 log(LOG_DEBUG, 1173 "%s: cisco input: %d bytes " 1174 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1175 ifp->if_xname, m->m_pkthdr.len, 1176 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1177 (u_int)h->time0, (u_int)h->time1); 1178 switch (ntohl(h->type)) { 1179 default: 1180 if (debug) 1181 addlog("%s: cisco unknown packet type: 0x%x\n", 1182 ifp->if_xname, ntohl(h->type)); 1183 break; 1184 case CISCO_ADDR_REPLY: 1185 /* Reply on address request, ignore */ 1186 break; 1187 case CISCO_KEEPALIVE_REQ: 1188 sp->pp_alivecnt = 0; 1189 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1190 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1191 /* Local and remote sequence numbers are equal. 1192 * Probably, the line is in loopback mode. */ 1193 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1194 printf ("%s: loopback\n", 1195 ifp->if_xname); 1196 sp->pp_loopcnt = 0; 1197 if (ifp->if_flags & IFF_UP) { 1198 if_down(ifp); 1199 IF_PURGE(&sp->pp_cpq); 1200 } 1201 } 1202 ++sp->pp_loopcnt; 1203 1204 /* Generate new local sequence number */ 1205 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1206 break; 1207 } 1208 sp->pp_loopcnt = 0; 1209 if (! (ifp->if_flags & IFF_UP) && 1210 (ifp->if_flags & IFF_RUNNING)) { 1211 if_up(ifp); 1212 } 1213 break; 1214 case CISCO_ADDR_REQ: 1215 #ifdef INET 1216 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1217 if (me != 0L) 1218 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1219 #endif 1220 break; 1221 } 1222 } 1223 1224 /* 1225 * Send Cisco keepalive packet. 1226 */ 1227 static void 1228 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1229 { 1230 STDDCL; 1231 struct ppp_header *h; 1232 struct cisco_packet *ch; 1233 struct mbuf *m; 1234 uint32_t t; 1235 1236 t = time_uptime * 1000; 1237 MGETHDR(m, M_DONTWAIT, MT_DATA); 1238 if (! m) 1239 return; 1240 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1241 m_reset_rcvif(m); 1242 1243 h = mtod(m, struct ppp_header *); 1244 h->address = CISCO_MULTICAST; 1245 h->control = 0; 1246 h->protocol = htons(CISCO_KEEPALIVE); 1247 1248 ch = (struct cisco_packet *)(h + 1); 1249 ch->type = htonl(type); 1250 ch->par1 = htonl(par1); 1251 ch->par2 = htonl(par2); 1252 ch->rel = -1; 1253 1254 ch->time0 = htons((u_short)(t >> 16)); 1255 ch->time1 = htons((u_short) t); 1256 1257 if (debug) 1258 log(LOG_DEBUG, 1259 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1260 ifp->if_xname, ntohl(ch->type), ch->par1, 1261 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1262 (u_int)ch->time1); 1263 1264 if (IF_QFULL(&sp->pp_cpq)) { 1265 IF_DROP(&sp->pp_fastq); 1266 IF_DROP(&ifp->if_snd); 1267 m_freem(m); 1268 ++ifp->if_oerrors; 1269 return; 1270 } else 1271 IF_ENQUEUE(&sp->pp_cpq, m); 1272 if (! (ifp->if_flags & IFF_OACTIVE)) 1273 if_start_lock(ifp); 1274 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1275 } 1276 1277 /* 1278 * PPP protocol implementation. 1279 */ 1280 1281 /* 1282 * Send PPP control protocol packet. 1283 */ 1284 static void 1285 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1286 u_char ident, u_short len, void *data) 1287 { 1288 STDDCL; 1289 struct lcp_header *lh; 1290 struct mbuf *m; 1291 size_t pkthdrlen; 1292 1293 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1294 1295 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1296 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1297 MGETHDR(m, M_DONTWAIT, MT_DATA); 1298 if (! m) 1299 return; 1300 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1301 m_reset_rcvif(m); 1302 1303 if (sp->pp_flags & PP_NOFRAMING) { 1304 *mtod(m, uint16_t *) = htons(proto); 1305 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1306 } else { 1307 struct ppp_header *h; 1308 h = mtod(m, struct ppp_header *); 1309 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1310 h->control = PPP_UI; /* Unnumbered Info */ 1311 h->protocol = htons(proto); /* Link Control Protocol */ 1312 lh = (struct lcp_header *)(h + 1); 1313 } 1314 lh->type = type; 1315 lh->ident = ident; 1316 lh->len = htons(LCP_HEADER_LEN + len); 1317 if (len) 1318 memcpy(lh + 1, data, len); 1319 1320 if (debug) { 1321 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1322 ifp->if_xname, 1323 sppp_proto_name(proto), 1324 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1325 if (len) 1326 sppp_print_bytes((u_char *)(lh + 1), len); 1327 addlog(">\n"); 1328 } 1329 if (IF_QFULL(&sp->pp_cpq)) { 1330 IF_DROP(&sp->pp_fastq); 1331 IF_DROP(&ifp->if_snd); 1332 m_freem(m); 1333 ++ifp->if_oerrors; 1334 return; 1335 } else 1336 IF_ENQUEUE(&sp->pp_cpq, m); 1337 if (! (ifp->if_flags & IFF_OACTIVE)) 1338 if_start_lock(ifp); 1339 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1340 } 1341 1342 /* 1343 * Handle incoming PPP control protocol packets. 1344 */ 1345 static void 1346 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1347 { 1348 STDDCL; 1349 struct lcp_header *h; 1350 int printlen, len = m->m_pkthdr.len; 1351 int rv; 1352 u_char *p; 1353 uint32_t u32; 1354 1355 if (len < 4) { 1356 if (debug) 1357 log(LOG_DEBUG, 1358 "%s: %s invalid packet length: %d bytes\n", 1359 ifp->if_xname, cp->name, len); 1360 return; 1361 } 1362 h = mtod(m, struct lcp_header *); 1363 if (debug) { 1364 printlen = ntohs(h->len); 1365 log(LOG_DEBUG, 1366 "%s: %s input(%s): <%s id=0x%x len=%d", 1367 ifp->if_xname, cp->name, 1368 sppp_state_name(sp->state[cp->protoidx]), 1369 sppp_cp_type_name(h->type), h->ident, printlen); 1370 if (len < printlen) 1371 printlen = len; 1372 if (printlen > 4) 1373 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1374 addlog(">\n"); 1375 } 1376 if (len > ntohs(h->len)) 1377 len = ntohs(h->len); 1378 p = (u_char *)(h + 1); 1379 switch (h->type) { 1380 case CONF_REQ: 1381 if (len < 4) { 1382 if (debug) 1383 addlog("%s: %s invalid conf-req length %d\n", 1384 ifp->if_xname, cp->name, 1385 len); 1386 ++ifp->if_ierrors; 1387 break; 1388 } 1389 /* handle states where RCR doesn't get a SCA/SCN */ 1390 switch (sp->state[cp->protoidx]) { 1391 case STATE_CLOSING: 1392 case STATE_STOPPING: 1393 return; 1394 case STATE_CLOSED: 1395 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1396 0, 0); 1397 return; 1398 } 1399 rv = (cp->RCR)(sp, h, len); 1400 if (rv < 0) { 1401 /* fatal error, shut down */ 1402 (cp->tld)(sp); 1403 sppp_lcp_tlf(sp); 1404 return; 1405 } 1406 switch (sp->state[cp->protoidx]) { 1407 case STATE_OPENED: 1408 (cp->tld)(sp); 1409 (cp->scr)(sp); 1410 /* fall through... */ 1411 case STATE_ACK_SENT: 1412 case STATE_REQ_SENT: 1413 sppp_cp_change_state(cp, sp, rv? 1414 STATE_ACK_SENT: STATE_REQ_SENT); 1415 break; 1416 case STATE_STOPPED: 1417 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1418 (cp->scr)(sp); 1419 sppp_cp_change_state(cp, sp, rv? 1420 STATE_ACK_SENT: STATE_REQ_SENT); 1421 break; 1422 case STATE_ACK_RCVD: 1423 if (rv) { 1424 sppp_cp_change_state(cp, sp, STATE_OPENED); 1425 if (debug) 1426 log(LOG_DEBUG, "%s: %s tlu\n", 1427 ifp->if_xname, 1428 cp->name); 1429 (cp->tlu)(sp); 1430 } else 1431 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1432 break; 1433 default: 1434 printf("%s: %s illegal %s in state %s\n", 1435 ifp->if_xname, cp->name, 1436 sppp_cp_type_name(h->type), 1437 sppp_state_name(sp->state[cp->protoidx])); 1438 ++ifp->if_ierrors; 1439 } 1440 break; 1441 case CONF_ACK: 1442 if (h->ident != sp->confid[cp->protoidx]) { 1443 if (debug) 1444 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1445 ifp->if_xname, cp->name, 1446 h->ident, sp->confid[cp->protoidx]); 1447 ++ifp->if_ierrors; 1448 break; 1449 } 1450 switch (sp->state[cp->protoidx]) { 1451 case STATE_CLOSED: 1452 case STATE_STOPPED: 1453 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1454 break; 1455 case STATE_CLOSING: 1456 case STATE_STOPPING: 1457 break; 1458 case STATE_REQ_SENT: 1459 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1460 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1461 break; 1462 case STATE_OPENED: 1463 (cp->tld)(sp); 1464 /* fall through */ 1465 case STATE_ACK_RCVD: 1466 (cp->scr)(sp); 1467 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1468 break; 1469 case STATE_ACK_SENT: 1470 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1471 sppp_cp_change_state(cp, sp, STATE_OPENED); 1472 if (debug) 1473 log(LOG_DEBUG, "%s: %s tlu\n", 1474 ifp->if_xname, cp->name); 1475 (cp->tlu)(sp); 1476 break; 1477 default: 1478 printf("%s: %s illegal %s in state %s\n", 1479 ifp->if_xname, cp->name, 1480 sppp_cp_type_name(h->type), 1481 sppp_state_name(sp->state[cp->protoidx])); 1482 ++ifp->if_ierrors; 1483 } 1484 break; 1485 case CONF_NAK: 1486 case CONF_REJ: 1487 if (h->ident != sp->confid[cp->protoidx]) { 1488 if (debug) 1489 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1490 ifp->if_xname, cp->name, 1491 h->ident, sp->confid[cp->protoidx]); 1492 ++ifp->if_ierrors; 1493 break; 1494 } 1495 if (h->type == CONF_NAK) 1496 (cp->RCN_nak)(sp, h, len); 1497 else /* CONF_REJ */ 1498 (cp->RCN_rej)(sp, h, len); 1499 1500 switch (sp->state[cp->protoidx]) { 1501 case STATE_CLOSED: 1502 case STATE_STOPPED: 1503 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1504 break; 1505 case STATE_REQ_SENT: 1506 case STATE_ACK_SENT: 1507 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1508 (cp->scr)(sp); 1509 break; 1510 case STATE_OPENED: 1511 (cp->tld)(sp); 1512 /* fall through */ 1513 case STATE_ACK_RCVD: 1514 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1515 (cp->scr)(sp); 1516 break; 1517 case STATE_CLOSING: 1518 case STATE_STOPPING: 1519 break; 1520 default: 1521 printf("%s: %s illegal %s in state %s\n", 1522 ifp->if_xname, cp->name, 1523 sppp_cp_type_name(h->type), 1524 sppp_state_name(sp->state[cp->protoidx])); 1525 ++ifp->if_ierrors; 1526 } 1527 break; 1528 1529 case TERM_REQ: 1530 switch (sp->state[cp->protoidx]) { 1531 case STATE_ACK_RCVD: 1532 case STATE_ACK_SENT: 1533 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1534 /* fall through */ 1535 case STATE_CLOSED: 1536 case STATE_STOPPED: 1537 case STATE_CLOSING: 1538 case STATE_STOPPING: 1539 case STATE_REQ_SENT: 1540 sta: 1541 /* Send Terminate-Ack packet. */ 1542 if (debug) 1543 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1544 ifp->if_xname, cp->name); 1545 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1546 break; 1547 case STATE_OPENED: 1548 (cp->tld)(sp); 1549 sp->rst_counter[cp->protoidx] = 0; 1550 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1551 goto sta; 1552 default: 1553 printf("%s: %s illegal %s in state %s\n", 1554 ifp->if_xname, cp->name, 1555 sppp_cp_type_name(h->type), 1556 sppp_state_name(sp->state[cp->protoidx])); 1557 ++ifp->if_ierrors; 1558 } 1559 break; 1560 case TERM_ACK: 1561 switch (sp->state[cp->protoidx]) { 1562 case STATE_CLOSED: 1563 case STATE_STOPPED: 1564 case STATE_REQ_SENT: 1565 case STATE_ACK_SENT: 1566 break; 1567 case STATE_CLOSING: 1568 (cp->tlf)(sp); 1569 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1570 sppp_lcp_check_and_close(sp); 1571 break; 1572 case STATE_STOPPING: 1573 (cp->tlf)(sp); 1574 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1575 sppp_lcp_check_and_close(sp); 1576 break; 1577 case STATE_ACK_RCVD: 1578 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1579 break; 1580 case STATE_OPENED: 1581 (cp->tld)(sp); 1582 (cp->scr)(sp); 1583 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1584 break; 1585 default: 1586 printf("%s: %s illegal %s in state %s\n", 1587 ifp->if_xname, cp->name, 1588 sppp_cp_type_name(h->type), 1589 sppp_state_name(sp->state[cp->protoidx])); 1590 ++ifp->if_ierrors; 1591 } 1592 break; 1593 case CODE_REJ: 1594 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1595 log(LOG_INFO, 1596 "%s: %s: ignoring RXJ (%s) for code ?, " 1597 "danger will robinson\n", 1598 ifp->if_xname, cp->name, 1599 sppp_cp_type_name(h->type)); 1600 switch (sp->state[cp->protoidx]) { 1601 case STATE_CLOSED: 1602 case STATE_STOPPED: 1603 case STATE_REQ_SENT: 1604 case STATE_ACK_SENT: 1605 case STATE_CLOSING: 1606 case STATE_STOPPING: 1607 case STATE_OPENED: 1608 break; 1609 case STATE_ACK_RCVD: 1610 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1611 break; 1612 default: 1613 printf("%s: %s illegal %s in state %s\n", 1614 ifp->if_xname, cp->name, 1615 sppp_cp_type_name(h->type), 1616 sppp_state_name(sp->state[cp->protoidx])); 1617 ++ifp->if_ierrors; 1618 } 1619 break; 1620 case PROTO_REJ: 1621 { 1622 int catastrophic; 1623 const struct cp *upper; 1624 int i; 1625 uint16_t proto; 1626 1627 catastrophic = 0; 1628 upper = NULL; 1629 proto = p[0] << 8 | p[1]; 1630 for (i = 0; i < IDX_COUNT; i++) { 1631 if (cps[i]->proto == proto) { 1632 upper = cps[i]; 1633 break; 1634 } 1635 } 1636 if (upper == NULL) 1637 catastrophic++; 1638 1639 if (debug) 1640 log(LOG_INFO, 1641 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1642 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1643 sppp_cp_type_name(h->type), proto, 1644 upper ? upper->name : "unknown", 1645 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1646 1647 /* 1648 * if we got RXJ+ against conf-req, the peer does not implement 1649 * this particular protocol type. terminate the protocol. 1650 */ 1651 if (upper && !catastrophic) { 1652 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1653 upper->Close(sp); 1654 break; 1655 } 1656 } 1657 1658 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1659 switch (sp->state[cp->protoidx]) { 1660 case STATE_CLOSED: 1661 case STATE_STOPPED: 1662 case STATE_REQ_SENT: 1663 case STATE_ACK_SENT: 1664 case STATE_CLOSING: 1665 case STATE_STOPPING: 1666 case STATE_OPENED: 1667 break; 1668 case STATE_ACK_RCVD: 1669 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1670 break; 1671 default: 1672 printf("%s: %s illegal %s in state %s\n", 1673 ifp->if_xname, cp->name, 1674 sppp_cp_type_name(h->type), 1675 sppp_state_name(sp->state[cp->protoidx])); 1676 ++ifp->if_ierrors; 1677 } 1678 break; 1679 } 1680 case DISC_REQ: 1681 if (cp->proto != PPP_LCP) 1682 goto illegal; 1683 /* Discard the packet. */ 1684 break; 1685 case ECHO_REQ: 1686 if (cp->proto != PPP_LCP) 1687 goto illegal; 1688 if (sp->state[cp->protoidx] != STATE_OPENED) { 1689 if (debug) 1690 addlog("%s: lcp echo req but lcp closed\n", 1691 ifp->if_xname); 1692 ++ifp->if_ierrors; 1693 break; 1694 } 1695 if (len < 8) { 1696 if (debug) 1697 addlog("%s: invalid lcp echo request " 1698 "packet length: %d bytes\n", 1699 ifp->if_xname, len); 1700 break; 1701 } 1702 memcpy(&u32, h + 1, sizeof u32); 1703 if (ntohl(u32) == sp->lcp.magic) { 1704 /* Line loopback mode detected. */ 1705 printf("%s: loopback\n", ifp->if_xname); 1706 if_down(ifp); 1707 IF_PURGE(&sp->pp_cpq); 1708 1709 /* Shut down the PPP link. */ 1710 /* XXX */ 1711 lcp.Down(sp); 1712 lcp.Up(sp); 1713 break; 1714 } 1715 u32 = htonl(sp->lcp.magic); 1716 memcpy(h + 1, &u32, sizeof u32); 1717 if (debug) 1718 addlog("%s: got lcp echo req, sending echo rep\n", 1719 ifp->if_xname); 1720 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1721 h + 1); 1722 break; 1723 case ECHO_REPLY: 1724 if (cp->proto != PPP_LCP) 1725 goto illegal; 1726 if (h->ident != sp->lcp.echoid) { 1727 ++ifp->if_ierrors; 1728 break; 1729 } 1730 if (len < 8) { 1731 if (debug) 1732 addlog("%s: lcp invalid echo reply " 1733 "packet length: %d bytes\n", 1734 ifp->if_xname, len); 1735 break; 1736 } 1737 if (debug) 1738 addlog("%s: lcp got echo rep\n", 1739 ifp->if_xname); 1740 memcpy(&u32, h + 1, sizeof u32); 1741 if (ntohl(u32) != sp->lcp.magic) 1742 sp->pp_alivecnt = 0; 1743 break; 1744 default: 1745 /* Unknown packet type -- send Code-Reject packet. */ 1746 illegal: 1747 if (debug) 1748 addlog("%s: %s send code-rej for 0x%x\n", 1749 ifp->if_xname, cp->name, h->type); 1750 sppp_cp_send(sp, cp->proto, CODE_REJ, 1751 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1752 ++ifp->if_ierrors; 1753 } 1754 } 1755 1756 1757 /* 1758 * The generic part of all Up/Down/Open/Close/TO event handlers. 1759 * Basically, the state transition handling in the automaton. 1760 */ 1761 static void 1762 sppp_up_event(const struct cp *cp, struct sppp *sp) 1763 { 1764 STDDCL; 1765 1766 if (debug) 1767 log(LOG_DEBUG, "%s: %s up(%s)\n", 1768 ifp->if_xname, cp->name, 1769 sppp_state_name(sp->state[cp->protoidx])); 1770 1771 switch (sp->state[cp->protoidx]) { 1772 case STATE_INITIAL: 1773 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1774 break; 1775 case STATE_STARTING: 1776 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1777 (cp->scr)(sp); 1778 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1779 break; 1780 default: 1781 printf("%s: %s illegal up in state %s\n", 1782 ifp->if_xname, cp->name, 1783 sppp_state_name(sp->state[cp->protoidx])); 1784 } 1785 } 1786 1787 static void 1788 sppp_down_event(const struct cp *cp, struct sppp *sp) 1789 { 1790 STDDCL; 1791 1792 if (debug) 1793 log(LOG_DEBUG, "%s: %s down(%s)\n", 1794 ifp->if_xname, cp->name, 1795 sppp_state_name(sp->state[cp->protoidx])); 1796 1797 switch (sp->state[cp->protoidx]) { 1798 case STATE_CLOSED: 1799 case STATE_CLOSING: 1800 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1801 break; 1802 case STATE_STOPPED: 1803 (cp->tls)(sp); 1804 /* fall through */ 1805 case STATE_STOPPING: 1806 case STATE_REQ_SENT: 1807 case STATE_ACK_RCVD: 1808 case STATE_ACK_SENT: 1809 sppp_cp_change_state(cp, sp, STATE_STARTING); 1810 break; 1811 case STATE_OPENED: 1812 (cp->tld)(sp); 1813 sppp_cp_change_state(cp, sp, STATE_STARTING); 1814 break; 1815 default: 1816 printf("%s: %s illegal down in state %s\n", 1817 ifp->if_xname, cp->name, 1818 sppp_state_name(sp->state[cp->protoidx])); 1819 } 1820 } 1821 1822 1823 static void 1824 sppp_open_event(const struct cp *cp, struct sppp *sp) 1825 { 1826 STDDCL; 1827 1828 if (debug) 1829 log(LOG_DEBUG, "%s: %s open(%s)\n", 1830 ifp->if_xname, cp->name, 1831 sppp_state_name(sp->state[cp->protoidx])); 1832 1833 switch (sp->state[cp->protoidx]) { 1834 case STATE_INITIAL: 1835 sppp_cp_change_state(cp, sp, STATE_STARTING); 1836 (cp->tls)(sp); 1837 break; 1838 case STATE_STARTING: 1839 break; 1840 case STATE_CLOSED: 1841 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1842 (cp->scr)(sp); 1843 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1844 break; 1845 case STATE_STOPPED: 1846 case STATE_STOPPING: 1847 case STATE_REQ_SENT: 1848 case STATE_ACK_RCVD: 1849 case STATE_ACK_SENT: 1850 case STATE_OPENED: 1851 break; 1852 case STATE_CLOSING: 1853 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1854 break; 1855 } 1856 } 1857 1858 1859 static void 1860 sppp_close_event(const struct cp *cp, struct sppp *sp) 1861 { 1862 STDDCL; 1863 1864 if (debug) 1865 log(LOG_DEBUG, "%s: %s close(%s)\n", 1866 ifp->if_xname, cp->name, 1867 sppp_state_name(sp->state[cp->protoidx])); 1868 1869 switch (sp->state[cp->protoidx]) { 1870 case STATE_INITIAL: 1871 case STATE_CLOSED: 1872 case STATE_CLOSING: 1873 break; 1874 case STATE_STARTING: 1875 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1876 (cp->tlf)(sp); 1877 break; 1878 case STATE_STOPPED: 1879 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1880 break; 1881 case STATE_STOPPING: 1882 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1883 break; 1884 case STATE_OPENED: 1885 (cp->tld)(sp); 1886 /* fall through */ 1887 case STATE_REQ_SENT: 1888 case STATE_ACK_RCVD: 1889 case STATE_ACK_SENT: 1890 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1891 sppp_cp_send(sp, cp->proto, TERM_REQ, 1892 ++sp->pp_seq[cp->protoidx], 0, 0); 1893 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1894 break; 1895 } 1896 } 1897 1898 static void 1899 sppp_to_event(const struct cp *cp, struct sppp *sp) 1900 { 1901 STDDCL; 1902 int s; 1903 1904 s = splnet(); 1905 if (debug) 1906 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1907 ifp->if_xname, cp->name, 1908 sppp_state_name(sp->state[cp->protoidx]), 1909 sp->rst_counter[cp->protoidx]); 1910 1911 if (--sp->rst_counter[cp->protoidx] < 0) 1912 /* TO- event */ 1913 switch (sp->state[cp->protoidx]) { 1914 case STATE_CLOSING: 1915 (cp->tlf)(sp); 1916 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1917 sppp_lcp_check_and_close(sp); 1918 break; 1919 case STATE_STOPPING: 1920 (cp->tlf)(sp); 1921 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1922 sppp_lcp_check_and_close(sp); 1923 break; 1924 case STATE_REQ_SENT: 1925 case STATE_ACK_RCVD: 1926 case STATE_ACK_SENT: 1927 (cp->tlf)(sp); 1928 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1929 sppp_lcp_check_and_close(sp); 1930 break; 1931 } 1932 else 1933 /* TO+ event */ 1934 switch (sp->state[cp->protoidx]) { 1935 case STATE_CLOSING: 1936 case STATE_STOPPING: 1937 sppp_cp_send(sp, cp->proto, TERM_REQ, 1938 ++sp->pp_seq[cp->protoidx], 0, 0); 1939 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1940 cp->TO, sp); 1941 break; 1942 case STATE_REQ_SENT: 1943 case STATE_ACK_RCVD: 1944 (cp->scr)(sp); 1945 /* sppp_cp_change_state() will restart the timer */ 1946 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1947 break; 1948 case STATE_ACK_SENT: 1949 (cp->scr)(sp); 1950 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1951 cp->TO, sp); 1952 break; 1953 } 1954 1955 splx(s); 1956 } 1957 1958 /* 1959 * Change the state of a control protocol in the state automaton. 1960 * Takes care of starting/stopping the restart timer. 1961 */ 1962 void 1963 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1964 { 1965 sp->state[cp->protoidx] = newstate; 1966 callout_stop(&sp->ch[cp->protoidx]); 1967 switch (newstate) { 1968 case STATE_INITIAL: 1969 case STATE_STARTING: 1970 case STATE_CLOSED: 1971 case STATE_STOPPED: 1972 case STATE_OPENED: 1973 break; 1974 case STATE_CLOSING: 1975 case STATE_STOPPING: 1976 case STATE_REQ_SENT: 1977 case STATE_ACK_RCVD: 1978 case STATE_ACK_SENT: 1979 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1980 cp->TO, sp); 1981 break; 1982 } 1983 } 1984 1985 /* 1986 *--------------------------------------------------------------------------* 1987 * * 1988 * The LCP implementation. * 1989 * * 1990 *--------------------------------------------------------------------------* 1991 */ 1992 static void 1993 sppp_lcp_init(struct sppp *sp) 1994 { 1995 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1996 sp->lcp.magic = 0; 1997 sp->state[IDX_LCP] = STATE_INITIAL; 1998 sp->fail_counter[IDX_LCP] = 0; 1999 sp->pp_seq[IDX_LCP] = 0; 2000 sp->pp_rseq[IDX_LCP] = 0; 2001 sp->lcp.protos = 0; 2002 2003 /* 2004 * Initialize counters and timeout values. Note that we don't 2005 * use the 3 seconds suggested in RFC 1661 since we are likely 2006 * running on a fast link. XXX We should probably implement 2007 * the exponential backoff option. Note that these values are 2008 * relevant for all control protocols, not just LCP only. 2009 */ 2010 sp->lcp.timeout = 1 * hz; 2011 sp->lcp.max_terminate = 2; 2012 sp->lcp.max_configure = 10; 2013 sp->lcp.max_failure = 10; 2014 callout_init(&sp->ch[IDX_LCP], 0); 2015 } 2016 2017 static void 2018 sppp_lcp_up(struct sppp *sp) 2019 { 2020 STDDCL; 2021 2022 /* Initialize activity timestamp: opening a connection is an activity */ 2023 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2024 2025 /* 2026 * If this interface is passive or dial-on-demand, and we are 2027 * still in Initial state, it means we've got an incoming 2028 * call. Activate the interface. 2029 */ 2030 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2031 if (debug) 2032 log(LOG_DEBUG, 2033 "%s: Up event", ifp->if_xname); 2034 ifp->if_flags |= IFF_RUNNING; 2035 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2036 if (debug) 2037 addlog("(incoming call)\n"); 2038 sp->pp_flags |= PP_CALLIN; 2039 lcp.Open(sp); 2040 } else if (debug) 2041 addlog("\n"); 2042 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2043 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2044 ifp->if_flags |= IFF_RUNNING; 2045 lcp.Open(sp); 2046 } 2047 2048 sppp_up_event(&lcp, sp); 2049 } 2050 2051 static void 2052 sppp_lcp_down(struct sppp *sp) 2053 { 2054 STDDCL; 2055 2056 sppp_down_event(&lcp, sp); 2057 2058 /* 2059 * If this is neither a dial-on-demand nor a passive 2060 * interface, simulate an ``ifconfig down'' action, so the 2061 * administrator can force a redial by another ``ifconfig 2062 * up''. XXX For leased line operation, should we immediately 2063 * try to reopen the connection here? 2064 */ 2065 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2066 if (debug) 2067 log(LOG_INFO, 2068 "%s: Down event (carrier loss), taking interface down.\n", 2069 ifp->if_xname); 2070 if_down(ifp); 2071 } else { 2072 if (debug) 2073 log(LOG_DEBUG, 2074 "%s: Down event (carrier loss)\n", 2075 ifp->if_xname); 2076 } 2077 sp->pp_flags &= ~PP_CALLIN; 2078 if (sp->state[IDX_LCP] != STATE_INITIAL) 2079 lcp.Close(sp); 2080 ifp->if_flags &= ~IFF_RUNNING; 2081 } 2082 2083 static void 2084 sppp_lcp_open(struct sppp *sp) 2085 { 2086 if (sp->pp_if.if_mtu < PP_MTU) { 2087 sp->lcp.mru = sp->pp_if.if_mtu; 2088 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2089 } else 2090 sp->lcp.mru = PP_MTU; 2091 sp->lcp.their_mru = PP_MTU; 2092 2093 /* 2094 * If we are authenticator, negotiate LCP_AUTH 2095 */ 2096 if (sp->hisauth.proto != 0) 2097 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2098 else 2099 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2100 sp->pp_flags &= ~PP_NEEDAUTH; 2101 sppp_open_event(&lcp, sp); 2102 } 2103 2104 static void 2105 sppp_lcp_close(struct sppp *sp) 2106 { 2107 sppp_close_event(&lcp, sp); 2108 } 2109 2110 static void 2111 sppp_lcp_TO(void *cookie) 2112 { 2113 sppp_to_event(&lcp, (struct sppp *)cookie); 2114 } 2115 2116 /* 2117 * Analyze a configure request. Return true if it was agreeable, and 2118 * caused action sca, false if it has been rejected or nak'ed, and 2119 * caused action scn. (The return value is used to make the state 2120 * transition decision in the state automaton.) 2121 */ 2122 static int 2123 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2124 { 2125 STDDCL; 2126 u_char *buf, *r, *p, l, blen; 2127 int origlen, rlen; 2128 uint32_t nmagic; 2129 u_short authproto; 2130 2131 len -= 4; 2132 origlen = len; 2133 buf = r = malloc (blen = len, M_TEMP, M_NOWAIT); 2134 if (! buf) 2135 return (0); 2136 2137 if (debug) 2138 log(LOG_DEBUG, "%s: lcp parse opts:", 2139 ifp->if_xname); 2140 2141 /* pass 1: check for things that need to be rejected */ 2142 p = (void *)(h + 1); 2143 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2144 /* Sanity check option length */ 2145 if (l > len) { 2146 /* 2147 * Malicious option - drop immediately. 2148 * XXX Maybe we should just RXJ it? 2149 */ 2150 addlog("%s: received malicious LCP option 0x%02x, " 2151 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2152 p[0], l, len); 2153 goto drop; 2154 } 2155 if (debug) 2156 addlog(" %s", sppp_lcp_opt_name(*p)); 2157 switch (*p) { 2158 case LCP_OPT_MAGIC: 2159 /* Magic number. */ 2160 /* fall through, both are same length */ 2161 case LCP_OPT_ASYNC_MAP: 2162 /* Async control character map. */ 2163 if (len >= 6 || l == 6) 2164 continue; 2165 if (debug) 2166 addlog(" [invalid]"); 2167 break; 2168 case LCP_OPT_MRU: 2169 /* Maximum receive unit. */ 2170 if (len >= 4 && l == 4) 2171 continue; 2172 if (debug) 2173 addlog(" [invalid]"); 2174 break; 2175 case LCP_OPT_AUTH_PROTO: 2176 if (len < 4) { 2177 if (debug) 2178 addlog(" [invalid]"); 2179 break; 2180 } 2181 authproto = (p[2] << 8) + p[3]; 2182 if (authproto == PPP_CHAP && l != 5) { 2183 if (debug) 2184 addlog(" [invalid chap len]"); 2185 break; 2186 } 2187 if (sp->myauth.proto == 0) { 2188 /* we are not configured to do auth */ 2189 if (debug) 2190 addlog(" [not configured]"); 2191 break; 2192 } 2193 /* 2194 * Remote want us to authenticate, remember this, 2195 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2196 * up. 2197 */ 2198 sp->pp_flags |= PP_NEEDAUTH; 2199 continue; 2200 default: 2201 /* Others not supported. */ 2202 if (debug) 2203 addlog(" [rej]"); 2204 break; 2205 } 2206 if (rlen + l > blen) { 2207 if (debug) 2208 addlog(" [overflow]"); 2209 continue; 2210 } 2211 /* Add the option to rejected list. */ 2212 memcpy(r, p, l); 2213 r += l; 2214 rlen += l; 2215 } 2216 if (rlen) { 2217 if (debug) 2218 addlog(" send conf-rej\n"); 2219 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2220 goto end; 2221 } else if (debug) 2222 addlog("\n"); 2223 2224 /* 2225 * pass 2: check for option values that are unacceptable and 2226 * thus require to be nak'ed. 2227 */ 2228 if (debug) 2229 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2230 ifp->if_xname); 2231 2232 p = (void *)(h + 1); 2233 len = origlen; 2234 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2235 if (debug) 2236 addlog(" %s", sppp_lcp_opt_name(*p)); 2237 switch (*p) { 2238 case LCP_OPT_MAGIC: 2239 /* Magic number -- extract. */ 2240 nmagic = (uint32_t)p[2] << 24 | 2241 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2242 if (nmagic != sp->lcp.magic) { 2243 if (debug) 2244 addlog(" 0x%x", nmagic); 2245 continue; 2246 } 2247 /* 2248 * Local and remote magics equal -- loopback? 2249 */ 2250 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2251 printf ("%s: loopback\n", 2252 ifp->if_xname); 2253 sp->pp_loopcnt = 0; 2254 if (ifp->if_flags & IFF_UP) { 2255 if_down(ifp); 2256 IF_PURGE(&sp->pp_cpq); 2257 /* XXX ? */ 2258 lcp.Down(sp); 2259 lcp.Up(sp); 2260 } 2261 } else if (debug) 2262 addlog(" [glitch]"); 2263 ++sp->pp_loopcnt; 2264 /* 2265 * We negate our magic here, and NAK it. If 2266 * we see it later in an NAK packet, we 2267 * suggest a new one. 2268 */ 2269 nmagic = ~sp->lcp.magic; 2270 /* Gonna NAK it. */ 2271 p[2] = nmagic >> 24; 2272 p[3] = nmagic >> 16; 2273 p[4] = nmagic >> 8; 2274 p[5] = nmagic; 2275 break; 2276 2277 case LCP_OPT_ASYNC_MAP: 2278 /* 2279 * Async control character map -- just ignore it. 2280 * 2281 * Quote from RFC 1662, chapter 6: 2282 * To enable this functionality, synchronous PPP 2283 * implementations MUST always respond to the 2284 * Async-Control-Character-Map Configuration 2285 * Option with the LCP Configure-Ack. However, 2286 * acceptance of the Configuration Option does 2287 * not imply that the synchronous implementation 2288 * will do any ACCM mapping. Instead, all such 2289 * octet mapping will be performed by the 2290 * asynchronous-to-synchronous converter. 2291 */ 2292 continue; 2293 2294 case LCP_OPT_MRU: 2295 /* 2296 * Maximum receive unit. Always agreeable, 2297 * but ignored by now. 2298 */ 2299 sp->lcp.their_mru = p[2] * 256 + p[3]; 2300 if (debug) 2301 addlog(" %ld", sp->lcp.their_mru); 2302 continue; 2303 2304 case LCP_OPT_AUTH_PROTO: 2305 authproto = (p[2] << 8) + p[3]; 2306 if (sp->myauth.proto != authproto) { 2307 /* not agreed, nak */ 2308 if (debug) 2309 addlog(" [mine %s != his %s]", 2310 sppp_proto_name(sp->myauth.proto), 2311 sppp_proto_name(authproto)); 2312 p[2] = sp->myauth.proto >> 8; 2313 p[3] = sp->myauth.proto; 2314 break; 2315 } 2316 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2317 if (debug) 2318 addlog(" [chap not MD5]"); 2319 p[4] = CHAP_MD5; 2320 break; 2321 } 2322 continue; 2323 } 2324 if (rlen + l > blen) { 2325 if (debug) 2326 addlog(" [overflow]"); 2327 continue; 2328 } 2329 /* Add the option to nak'ed list. */ 2330 memcpy(r, p, l); 2331 r += l; 2332 rlen += l; 2333 } 2334 if (rlen) { 2335 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2336 if (debug) 2337 addlog(" max_failure (%d) exceeded, " 2338 "send conf-rej\n", 2339 sp->lcp.max_failure); 2340 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2341 } else { 2342 if (debug) 2343 addlog(" send conf-nak\n"); 2344 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2345 } 2346 goto end; 2347 } else { 2348 if (debug) 2349 addlog(" send conf-ack\n"); 2350 sp->fail_counter[IDX_LCP] = 0; 2351 sp->pp_loopcnt = 0; 2352 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2353 } 2354 2355 end: 2356 free(buf, M_TEMP); 2357 return (rlen == 0); 2358 2359 drop: 2360 free(buf, M_TEMP); 2361 return -1; 2362 } 2363 2364 /* 2365 * Analyze the LCP Configure-Reject option list, and adjust our 2366 * negotiation. 2367 */ 2368 static void 2369 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2370 { 2371 STDDCL; 2372 u_char *buf, *p, l; 2373 2374 len -= 4; 2375 buf = malloc (len, M_TEMP, M_NOWAIT); 2376 if (!buf) 2377 return; 2378 2379 if (debug) 2380 log(LOG_DEBUG, "%s: lcp rej opts:", 2381 ifp->if_xname); 2382 2383 p = (void *)(h + 1); 2384 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2385 /* Sanity check option length */ 2386 if (l > len) { 2387 /* 2388 * Malicious option - drop immediately. 2389 * XXX Maybe we should just RXJ it? 2390 */ 2391 addlog("%s: received malicious LCP option, " 2392 "dropping.\n", ifp->if_xname); 2393 goto drop; 2394 } 2395 if (debug) 2396 addlog(" %s", sppp_lcp_opt_name(*p)); 2397 switch (*p) { 2398 case LCP_OPT_MAGIC: 2399 /* Magic number -- can't use it, use 0 */ 2400 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2401 sp->lcp.magic = 0; 2402 break; 2403 case LCP_OPT_MRU: 2404 /* 2405 * We try to negotiate a lower MRU if the underlying 2406 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2407 * peer rejects this lower rate, fallback to the 2408 * default. 2409 */ 2410 if (debug) { 2411 addlog("%s: warning: peer rejected our MRU of " 2412 "%ld bytes. Defaulting to %d bytes\n", 2413 ifp->if_xname, sp->lcp.mru, PP_MTU); 2414 } 2415 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2416 sp->lcp.mru = PP_MTU; 2417 break; 2418 case LCP_OPT_AUTH_PROTO: 2419 /* 2420 * Peer doesn't want to authenticate himself, 2421 * deny unless this is a dialout call, and 2422 * SPPP_AUTHFLAG_NOCALLOUT is set. 2423 */ 2424 if ((sp->pp_flags & PP_CALLIN) == 0 && 2425 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2426 if (debug) 2427 addlog(" [don't insist on auth " 2428 "for callout]"); 2429 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2430 break; 2431 } 2432 if (debug) 2433 addlog("[access denied]\n"); 2434 lcp.Close(sp); 2435 break; 2436 } 2437 } 2438 if (debug) 2439 addlog("\n"); 2440 drop: 2441 free(buf, M_TEMP); 2442 return; 2443 } 2444 2445 /* 2446 * Analyze the LCP Configure-NAK option list, and adjust our 2447 * negotiation. 2448 */ 2449 static void 2450 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2451 { 2452 STDDCL; 2453 u_char *buf, *p, l, blen; 2454 uint32_t magic; 2455 2456 len -= 4; 2457 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 2458 if (!buf) 2459 return; 2460 2461 if (debug) 2462 log(LOG_DEBUG, "%s: lcp nak opts:", 2463 ifp->if_xname); 2464 2465 p = (void *)(h + 1); 2466 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2467 /* Sanity check option length */ 2468 if (l > len) { 2469 /* 2470 * Malicious option - drop immediately. 2471 * XXX Maybe we should just RXJ it? 2472 */ 2473 addlog("%s: received malicious LCP option, " 2474 "dropping.\n", ifp->if_xname); 2475 goto drop; 2476 } 2477 if (debug) 2478 addlog(" %s", sppp_lcp_opt_name(*p)); 2479 switch (*p) { 2480 case LCP_OPT_MAGIC: 2481 /* Magic number -- renegotiate */ 2482 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2483 len >= 6 && l == 6) { 2484 magic = (uint32_t)p[2] << 24 | 2485 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2486 /* 2487 * If the remote magic is our negated one, 2488 * this looks like a loopback problem. 2489 * Suggest a new magic to make sure. 2490 */ 2491 if (magic == ~sp->lcp.magic) { 2492 if (debug) 2493 addlog(" magic glitch"); 2494 sp->lcp.magic = cprng_fast32(); 2495 } else { 2496 sp->lcp.magic = magic; 2497 if (debug) 2498 addlog(" %d", magic); 2499 } 2500 } 2501 break; 2502 case LCP_OPT_MRU: 2503 /* 2504 * Peer wants to advise us to negotiate an MRU. 2505 * Agree on it if it's reasonable, or use 2506 * default otherwise. 2507 */ 2508 if (len >= 4 && l == 4) { 2509 u_int mru = p[2] * 256 + p[3]; 2510 if (debug) 2511 addlog(" %d", mru); 2512 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2513 mru = sp->pp_if.if_mtu; 2514 sp->lcp.mru = mru; 2515 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2516 } 2517 break; 2518 case LCP_OPT_AUTH_PROTO: 2519 /* 2520 * Peer doesn't like our authentication method, 2521 * deny. 2522 */ 2523 if (debug) 2524 addlog("[access denied]\n"); 2525 lcp.Close(sp); 2526 break; 2527 } 2528 } 2529 if (debug) 2530 addlog("\n"); 2531 drop: 2532 free(buf, M_TEMP); 2533 return; 2534 } 2535 2536 static void 2537 sppp_lcp_tlu(struct sppp *sp) 2538 { 2539 struct ifnet *ifp = &sp->pp_if; 2540 int i; 2541 uint32_t mask; 2542 2543 /* XXX ? */ 2544 if (! (ifp->if_flags & IFF_UP) && 2545 (ifp->if_flags & IFF_RUNNING)) { 2546 /* Coming out of loopback mode. */ 2547 if_up(ifp); 2548 } 2549 2550 for (i = 0; i < IDX_COUNT; i++) 2551 if ((cps[i])->flags & CP_QUAL) 2552 (cps[i])->Open(sp); 2553 2554 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2555 (sp->pp_flags & PP_NEEDAUTH) != 0) 2556 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 2557 else 2558 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 2559 2560 /* 2561 * Open all authentication protocols. This is even required 2562 * if we already proceeded to network phase, since it might be 2563 * that remote wants us to authenticate, so we might have to 2564 * send a PAP request. Undesired authentication protocols 2565 * don't do anything when they get an Open event. 2566 */ 2567 for (i = 0; i < IDX_COUNT; i++) 2568 if ((cps[i])->flags & CP_AUTH) 2569 (cps[i])->Open(sp); 2570 2571 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2572 /* Notify all NCPs. */ 2573 for (i = 0; i < IDX_COUNT; i++) 2574 if ((cps[i])->flags & CP_NCP) 2575 (cps[i])->Open(sp); 2576 } 2577 2578 /* Send Up events to all started protos. */ 2579 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2580 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2581 (cps[i])->Up(sp); 2582 2583 /* notify low-level driver of state change */ 2584 if (sp->pp_chg) 2585 sp->pp_chg(sp, (int)sp->pp_phase); 2586 2587 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2588 /* if no NCP is starting, close down */ 2589 sppp_lcp_check_and_close(sp); 2590 } 2591 2592 static void 2593 sppp_lcp_tld(struct sppp *sp) 2594 { 2595 int i; 2596 uint32_t mask; 2597 2598 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 2599 2600 /* 2601 * Take upper layers down. We send the Down event first and 2602 * the Close second to prevent the upper layers from sending 2603 * ``a flurry of terminate-request packets'', as the RFC 2604 * describes it. 2605 */ 2606 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2607 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2608 (cps[i])->Down(sp); 2609 (cps[i])->Close(sp); 2610 } 2611 } 2612 2613 static void 2614 sppp_lcp_tls(struct sppp *sp) 2615 { 2616 2617 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2618 printf("%s: authentication failed %d times, not retrying again\n", 2619 sp->pp_if.if_xname, sp->pp_auth_failures); 2620 if_down(&sp->pp_if); 2621 return; 2622 } 2623 2624 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 2625 2626 /* Notify lower layer if desired. */ 2627 if (sp->pp_tls) 2628 (sp->pp_tls)(sp); 2629 } 2630 2631 static void 2632 sppp_lcp_tlf(struct sppp *sp) 2633 { 2634 2635 sppp_change_phase(sp, SPPP_PHASE_DEAD); 2636 2637 /* Notify lower layer if desired. */ 2638 if (sp->pp_tlf) 2639 (sp->pp_tlf)(sp); 2640 } 2641 2642 static void 2643 sppp_lcp_scr(struct sppp *sp) 2644 { 2645 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2646 int i = 0; 2647 u_short authproto; 2648 2649 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2650 if (! sp->lcp.magic) 2651 sp->lcp.magic = cprng_fast32(); 2652 opt[i++] = LCP_OPT_MAGIC; 2653 opt[i++] = 6; 2654 opt[i++] = sp->lcp.magic >> 24; 2655 opt[i++] = sp->lcp.magic >> 16; 2656 opt[i++] = sp->lcp.magic >> 8; 2657 opt[i++] = sp->lcp.magic; 2658 } 2659 2660 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2661 opt[i++] = LCP_OPT_MRU; 2662 opt[i++] = 4; 2663 opt[i++] = sp->lcp.mru >> 8; 2664 opt[i++] = sp->lcp.mru; 2665 } 2666 2667 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2668 authproto = sp->hisauth.proto; 2669 opt[i++] = LCP_OPT_AUTH_PROTO; 2670 opt[i++] = authproto == PPP_CHAP? 5: 4; 2671 opt[i++] = authproto >> 8; 2672 opt[i++] = authproto; 2673 if (authproto == PPP_CHAP) 2674 opt[i++] = CHAP_MD5; 2675 } 2676 2677 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2678 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2679 } 2680 2681 /* 2682 * Check the open NCPs, return true if at least one NCP is open. 2683 */ 2684 static int 2685 sppp_ncp_check(struct sppp *sp) 2686 { 2687 int i, mask; 2688 2689 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2690 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2691 return 1; 2692 return 0; 2693 } 2694 2695 /* 2696 * Re-check the open NCPs and see if we should terminate the link. 2697 * Called by the NCPs during their tlf action handling. 2698 */ 2699 static void 2700 sppp_lcp_check_and_close(struct sppp *sp) 2701 { 2702 2703 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2704 /* don't bother, we are already going down */ 2705 return; 2706 2707 if (sppp_ncp_check(sp)) 2708 return; 2709 2710 lcp.Close(sp); 2711 } 2712 2713 2714 /* 2715 *--------------------------------------------------------------------------* 2716 * * 2717 * The IPCP implementation. * 2718 * * 2719 *--------------------------------------------------------------------------* 2720 */ 2721 2722 static void 2723 sppp_ipcp_init(struct sppp *sp) 2724 { 2725 sp->ipcp.opts = 0; 2726 sp->ipcp.flags = 0; 2727 sp->state[IDX_IPCP] = STATE_INITIAL; 2728 sp->fail_counter[IDX_IPCP] = 0; 2729 sp->pp_seq[IDX_IPCP] = 0; 2730 sp->pp_rseq[IDX_IPCP] = 0; 2731 callout_init(&sp->ch[IDX_IPCP], 0); 2732 } 2733 2734 static void 2735 sppp_ipcp_up(struct sppp *sp) 2736 { 2737 sppp_up_event(&ipcp, sp); 2738 } 2739 2740 static void 2741 sppp_ipcp_down(struct sppp *sp) 2742 { 2743 sppp_down_event(&ipcp, sp); 2744 } 2745 2746 static void 2747 sppp_ipcp_open(struct sppp *sp) 2748 { 2749 STDDCL; 2750 uint32_t myaddr, hisaddr; 2751 2752 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2753 sp->ipcp.req_myaddr = 0; 2754 sp->ipcp.req_hisaddr = 0; 2755 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2756 2757 #ifdef INET 2758 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2759 #else 2760 myaddr = hisaddr = 0; 2761 #endif 2762 /* 2763 * If we don't have his address, this probably means our 2764 * interface doesn't want to talk IP at all. (This could 2765 * be the case if somebody wants to speak only IPX, for 2766 * example.) Don't open IPCP in this case. 2767 */ 2768 if (hisaddr == 0) { 2769 /* XXX this message should go away */ 2770 if (debug) 2771 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2772 ifp->if_xname); 2773 return; 2774 } 2775 2776 if (myaddr == 0) { 2777 /* 2778 * I don't have an assigned address, so i need to 2779 * negotiate my address. 2780 */ 2781 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2782 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2783 } 2784 if (hisaddr == 1) { 2785 /* 2786 * XXX - remove this hack! 2787 * remote has no valid address, we need to get one assigned. 2788 */ 2789 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2790 } 2791 sppp_open_event(&ipcp, sp); 2792 } 2793 2794 static void 2795 sppp_ipcp_close(struct sppp *sp) 2796 { 2797 STDDCL; 2798 2799 sppp_close_event(&ipcp, sp); 2800 #ifdef INET 2801 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2802 /* 2803 * Some address was dynamic, clear it again. 2804 */ 2805 sppp_clear_ip_addrs(sp); 2806 #endif 2807 2808 if (sp->pp_saved_mtu > 0) { 2809 ifp->if_mtu = sp->pp_saved_mtu; 2810 sp->pp_saved_mtu = 0; 2811 if (debug) 2812 log(LOG_DEBUG, 2813 "%s: resetting MTU to %" PRIu64 " bytes\n", 2814 ifp->if_xname, ifp->if_mtu); 2815 } 2816 } 2817 2818 static void 2819 sppp_ipcp_TO(void *cookie) 2820 { 2821 sppp_to_event(&ipcp, (struct sppp *)cookie); 2822 } 2823 2824 /* 2825 * Analyze a configure request. Return true if it was agreeable, and 2826 * caused action sca, false if it has been rejected or nak'ed, and 2827 * caused action scn. (The return value is used to make the state 2828 * transition decision in the state automaton.) 2829 */ 2830 static int 2831 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2832 { 2833 u_char *buf, *r, *p, l, blen; 2834 struct ifnet *ifp = &sp->pp_if; 2835 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2836 uint32_t hisaddr, desiredaddr; 2837 2838 len -= 4; 2839 origlen = len; 2840 /* 2841 * Make sure to allocate a buf that can at least hold a 2842 * conf-nak with an `address' option. We might need it below. 2843 */ 2844 blen = len < 6 ? 6 : len; 2845 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 2846 if (! buf) 2847 return (0); 2848 2849 /* pass 1: see if we can recognize them */ 2850 if (debug) 2851 log(LOG_DEBUG, "%s: ipcp parse opts:", 2852 ifp->if_xname); 2853 p = (void *)(h + 1); 2854 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2855 /* Sanity check option length */ 2856 if (l > len) { 2857 /* XXX should we just RXJ? */ 2858 addlog("%s: malicious IPCP option received, dropping\n", 2859 ifp->if_xname); 2860 goto drop; 2861 } 2862 if (debug) 2863 addlog(" %s", sppp_ipcp_opt_name(*p)); 2864 switch (*p) { 2865 #ifdef notyet 2866 case IPCP_OPT_COMPRESSION: 2867 if (len >= 6 && l >= 6) { 2868 /* correctly formed compress option */ 2869 continue; 2870 } 2871 if (debug) 2872 addlog(" [invalid]"); 2873 break; 2874 #endif 2875 case IPCP_OPT_ADDRESS: 2876 if (len >= 6 && l == 6) { 2877 /* correctly formed address option */ 2878 continue; 2879 } 2880 if (debug) 2881 addlog(" [invalid]"); 2882 break; 2883 default: 2884 /* Others not supported. */ 2885 if (debug) 2886 addlog(" [rej]"); 2887 break; 2888 } 2889 /* Add the option to rejected list. */ 2890 if (rlen + l > blen) { 2891 if (debug) 2892 addlog(" [overflow]"); 2893 continue; 2894 } 2895 memcpy(r, p, l); 2896 r += l; 2897 rlen += l; 2898 } 2899 if (rlen) { 2900 if (debug) 2901 addlog(" send conf-rej\n"); 2902 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2903 goto end; 2904 } else if (debug) 2905 addlog("\n"); 2906 2907 /* pass 2: parse option values */ 2908 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2909 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2910 else 2911 #ifdef INET 2912 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2913 #else 2914 hisaddr = 0; 2915 #endif 2916 if (debug) 2917 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2918 ifp->if_xname); 2919 p = (void *)(h + 1); 2920 len = origlen; 2921 for (rlen=0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2922 if (debug) 2923 addlog(" %s", sppp_ipcp_opt_name(*p)); 2924 switch (*p) { 2925 #ifdef notyet 2926 case IPCP_OPT_COMPRESSION: 2927 continue; 2928 #endif 2929 case IPCP_OPT_ADDRESS: 2930 desiredaddr = p[2] << 24 | p[3] << 16 | 2931 p[4] << 8 | p[5]; 2932 if (desiredaddr == hisaddr || 2933 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2934 /* 2935 * Peer's address is same as our value, 2936 * this is agreeable. Gonna conf-ack 2937 * it. 2938 */ 2939 if (debug) 2940 addlog(" %s [ack]", 2941 sppp_dotted_quad(hisaddr)); 2942 /* record that we've seen it already */ 2943 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2944 sp->ipcp.req_hisaddr = desiredaddr; 2945 hisaddr = desiredaddr; 2946 continue; 2947 } 2948 /* 2949 * The address wasn't agreeable. This is either 2950 * he sent us 0.0.0.0, asking to assign him an 2951 * address, or he send us another address not 2952 * matching our value. Either case, we gonna 2953 * conf-nak it with our value. 2954 */ 2955 if (debug) { 2956 if (desiredaddr == 0) 2957 addlog(" [addr requested]"); 2958 else 2959 addlog(" %s [not agreed]", 2960 sppp_dotted_quad(desiredaddr)); 2961 } 2962 2963 p[2] = hisaddr >> 24; 2964 p[3] = hisaddr >> 16; 2965 p[4] = hisaddr >> 8; 2966 p[5] = hisaddr; 2967 break; 2968 } 2969 if (rlen + l > blen) { 2970 if (debug) 2971 addlog(" [overflow]"); 2972 continue; 2973 } 2974 /* Add the option to nak'ed list. */ 2975 memcpy(r, p, l); 2976 r += l; 2977 rlen += l; 2978 } 2979 2980 /* 2981 * If we are about to conf-ack the request, but haven't seen 2982 * his address so far, gonna conf-nak it instead, with the 2983 * `address' option present and our idea of his address being 2984 * filled in there, to request negotiation of both addresses. 2985 * 2986 * XXX This can result in an endless req - nak loop if peer 2987 * doesn't want to send us his address. Q: What should we do 2988 * about it? XXX A: implement the max-failure counter. 2989 */ 2990 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2991 buf[0] = IPCP_OPT_ADDRESS; 2992 buf[1] = 6; 2993 buf[2] = hisaddr >> 24; 2994 buf[3] = hisaddr >> 16; 2995 buf[4] = hisaddr >> 8; 2996 buf[5] = hisaddr; 2997 rlen = 6; 2998 if (debug) 2999 addlog(" still need hisaddr"); 3000 } 3001 3002 if (rlen) { 3003 if (debug) 3004 addlog(" send conf-nak\n"); 3005 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3006 } else { 3007 if (debug) 3008 addlog(" send conf-ack\n"); 3009 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3010 } 3011 3012 end: 3013 free(buf, M_TEMP); 3014 return (rlen == 0); 3015 3016 drop: 3017 free(buf, M_TEMP); 3018 return -1; 3019 } 3020 3021 /* 3022 * Analyze the IPCP Configure-Reject option list, and adjust our 3023 * negotiation. 3024 */ 3025 static void 3026 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3027 { 3028 u_char *buf, *p, l, blen; 3029 struct ifnet *ifp = &sp->pp_if; 3030 int debug = ifp->if_flags & IFF_DEBUG; 3031 3032 len -= 4; 3033 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3034 if (!buf) 3035 return; 3036 3037 if (debug) 3038 log(LOG_DEBUG, "%s: ipcp rej opts:", 3039 ifp->if_xname); 3040 3041 p = (void *)(h + 1); 3042 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3043 /* Sanity check option length */ 3044 if (l > len) { 3045 /* XXX should we just RXJ? */ 3046 addlog("%s: malicious IPCP option received, dropping\n", 3047 ifp->if_xname); 3048 goto drop; 3049 } 3050 if (debug) 3051 addlog(" %s", sppp_ipcp_opt_name(*p)); 3052 switch (*p) { 3053 case IPCP_OPT_ADDRESS: 3054 /* 3055 * Peer doesn't grok address option. This is 3056 * bad. XXX Should we better give up here? 3057 */ 3058 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3059 break; 3060 #ifdef notyet 3061 case IPCP_OPT_COMPRESS: 3062 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3063 break; 3064 #endif 3065 } 3066 } 3067 if (debug) 3068 addlog("\n"); 3069 drop: 3070 free(buf, M_TEMP); 3071 return; 3072 } 3073 3074 /* 3075 * Analyze the IPCP Configure-NAK option list, and adjust our 3076 * negotiation. 3077 */ 3078 static void 3079 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3080 { 3081 u_char *p, l; 3082 struct ifnet *ifp = &sp->pp_if; 3083 int debug = ifp->if_flags & IFF_DEBUG; 3084 uint32_t wantaddr; 3085 3086 len -= 4; 3087 3088 if (debug) 3089 log(LOG_DEBUG, "%s: ipcp nak opts:", 3090 ifp->if_xname); 3091 3092 p = (void *)(h + 1); 3093 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3094 /* Sanity check option length */ 3095 if (l > len) { 3096 /* XXX should we just RXJ? */ 3097 addlog("%s: malicious IPCP option received, dropping\n", 3098 ifp->if_xname); 3099 return; 3100 } 3101 if (debug) 3102 addlog(" %s", sppp_ipcp_opt_name(*p)); 3103 switch (*p) { 3104 case IPCP_OPT_ADDRESS: 3105 /* 3106 * Peer doesn't like our local IP address. See 3107 * if we can do something for him. We'll drop 3108 * him our address then. 3109 */ 3110 if (len >= 6 && l == 6) { 3111 wantaddr = p[2] << 24 | p[3] << 16 | 3112 p[4] << 8 | p[5]; 3113 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3114 if (debug) 3115 addlog(" [wantaddr %s]", 3116 sppp_dotted_quad(wantaddr)); 3117 /* 3118 * When doing dynamic address assignment, 3119 * we accept his offer. Otherwise, we 3120 * ignore it and thus continue to negotiate 3121 * our already existing value. 3122 */ 3123 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3124 if (debug) 3125 addlog(" [agree]"); 3126 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3127 sp->ipcp.req_myaddr = wantaddr; 3128 } 3129 } 3130 break; 3131 3132 case IPCP_OPT_PRIMDNS: 3133 if (len >= 6 && l == 6) { 3134 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3135 p[4] << 8 | p[5]; 3136 } 3137 break; 3138 3139 case IPCP_OPT_SECDNS: 3140 if (len >= 6 && l == 6) { 3141 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3142 p[4] << 8 | p[5]; 3143 } 3144 break; 3145 #ifdef notyet 3146 case IPCP_OPT_COMPRESS: 3147 /* 3148 * Peer wants different compression parameters. 3149 */ 3150 break; 3151 #endif 3152 } 3153 } 3154 if (debug) 3155 addlog("\n"); 3156 } 3157 3158 static void 3159 sppp_ipcp_tlu(struct sppp *sp) 3160 { 3161 #ifdef INET 3162 /* we are up. Set addresses and notify anyone interested */ 3163 STDDCL; 3164 uint32_t myaddr, hisaddr; 3165 3166 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3167 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3168 myaddr = sp->ipcp.req_myaddr; 3169 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3170 hisaddr = sp->ipcp.req_hisaddr; 3171 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3172 3173 if (ifp->if_mtu > sp->lcp.their_mru) { 3174 sp->pp_saved_mtu = ifp->if_mtu; 3175 ifp->if_mtu = sp->lcp.their_mru; 3176 if (debug) 3177 log(LOG_DEBUG, 3178 "%s: setting MTU to %" PRIu64 " bytes\n", 3179 ifp->if_xname, ifp->if_mtu); 3180 } 3181 3182 if (sp->pp_con) 3183 sp->pp_con(sp); 3184 #endif 3185 } 3186 3187 static void 3188 sppp_ipcp_tld(struct sppp *sp) 3189 { 3190 } 3191 3192 static void 3193 sppp_ipcp_tls(struct sppp *sp) 3194 { 3195 /* indicate to LCP that it must stay alive */ 3196 sp->lcp.protos |= (1 << IDX_IPCP); 3197 } 3198 3199 static void 3200 sppp_ipcp_tlf(struct sppp *sp) 3201 { 3202 /* we no longer need LCP */ 3203 sp->lcp.protos &= ~(1 << IDX_IPCP); 3204 } 3205 3206 static void 3207 sppp_ipcp_scr(struct sppp *sp) 3208 { 3209 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3210 #ifdef INET 3211 uint32_t ouraddr; 3212 #endif 3213 int i = 0; 3214 3215 #ifdef notyet 3216 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3217 opt[i++] = IPCP_OPT_COMPRESSION; 3218 opt[i++] = 6; 3219 opt[i++] = 0; /* VJ header compression */ 3220 opt[i++] = 0x2d; /* VJ header compression */ 3221 opt[i++] = max_slot_id; 3222 opt[i++] = comp_slot_id; 3223 } 3224 #endif 3225 3226 #ifdef INET 3227 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3228 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3229 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3230 else 3231 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3232 opt[i++] = IPCP_OPT_ADDRESS; 3233 opt[i++] = 6; 3234 opt[i++] = ouraddr >> 24; 3235 opt[i++] = ouraddr >> 16; 3236 opt[i++] = ouraddr >> 8; 3237 opt[i++] = ouraddr; 3238 } 3239 #endif 3240 3241 if (sp->query_dns & 1) { 3242 opt[i++] = IPCP_OPT_PRIMDNS; 3243 opt[i++] = 6; 3244 opt[i++] = sp->dns_addrs[0] >> 24; 3245 opt[i++] = sp->dns_addrs[0] >> 16; 3246 opt[i++] = sp->dns_addrs[0] >> 8; 3247 opt[i++] = sp->dns_addrs[0]; 3248 } 3249 if (sp->query_dns & 2) { 3250 opt[i++] = IPCP_OPT_SECDNS; 3251 opt[i++] = 6; 3252 opt[i++] = sp->dns_addrs[1] >> 24; 3253 opt[i++] = sp->dns_addrs[1] >> 16; 3254 opt[i++] = sp->dns_addrs[1] >> 8; 3255 opt[i++] = sp->dns_addrs[1]; 3256 } 3257 3258 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3259 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3260 } 3261 3262 3263 /* 3264 *--------------------------------------------------------------------------* 3265 * * 3266 * The IPv6CP implementation. * 3267 * * 3268 *--------------------------------------------------------------------------* 3269 */ 3270 3271 #ifdef INET6 3272 static void 3273 sppp_ipv6cp_init(struct sppp *sp) 3274 { 3275 sp->ipv6cp.opts = 0; 3276 sp->ipv6cp.flags = 0; 3277 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3278 sp->fail_counter[IDX_IPV6CP] = 0; 3279 sp->pp_seq[IDX_IPV6CP] = 0; 3280 sp->pp_rseq[IDX_IPV6CP] = 0; 3281 callout_init(&sp->ch[IDX_IPV6CP], 0); 3282 } 3283 3284 static void 3285 sppp_ipv6cp_up(struct sppp *sp) 3286 { 3287 sppp_up_event(&ipv6cp, sp); 3288 } 3289 3290 static void 3291 sppp_ipv6cp_down(struct sppp *sp) 3292 { 3293 sppp_down_event(&ipv6cp, sp); 3294 } 3295 3296 static void 3297 sppp_ipv6cp_open(struct sppp *sp) 3298 { 3299 STDDCL; 3300 struct in6_addr myaddr, hisaddr; 3301 3302 #ifdef IPV6CP_MYIFID_DYN 3303 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3304 #else 3305 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3306 #endif 3307 3308 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3309 /* 3310 * If we don't have our address, this probably means our 3311 * interface doesn't want to talk IPv6 at all. (This could 3312 * be the case if somebody wants to speak only IPX, for 3313 * example.) Don't open IPv6CP in this case. 3314 */ 3315 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3316 /* XXX this message should go away */ 3317 if (debug) 3318 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3319 ifp->if_xname); 3320 return; 3321 } 3322 3323 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3324 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3325 sppp_open_event(&ipv6cp, sp); 3326 } 3327 3328 static void 3329 sppp_ipv6cp_close(struct sppp *sp) 3330 { 3331 sppp_close_event(&ipv6cp, sp); 3332 } 3333 3334 static void 3335 sppp_ipv6cp_TO(void *cookie) 3336 { 3337 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3338 } 3339 3340 /* 3341 * Analyze a configure request. Return true if it was agreeable, and 3342 * caused action sca, false if it has been rejected or nak'ed, and 3343 * caused action scn. (The return value is used to make the state 3344 * transition decision in the state automaton.) 3345 */ 3346 static int 3347 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3348 { 3349 u_char *buf, *r, *p, l, blen; 3350 struct ifnet *ifp = &sp->pp_if; 3351 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3352 struct in6_addr myaddr, desiredaddr, suggestaddr; 3353 int ifidcount; 3354 int type; 3355 int collision, nohisaddr; 3356 3357 len -= 4; 3358 origlen = len; 3359 /* 3360 * Make sure to allocate a buf that can at least hold a 3361 * conf-nak with an `address' option. We might need it below. 3362 */ 3363 blen = len < 6 ? 6 : len; 3364 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 3365 if (! buf) 3366 return (0); 3367 3368 /* pass 1: see if we can recognize them */ 3369 if (debug) 3370 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3371 ifp->if_xname); 3372 p = (void *)(h + 1); 3373 ifidcount = 0; 3374 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3375 /* Sanity check option length */ 3376 if (l > len) { 3377 /* XXX just RXJ? */ 3378 addlog("%s: received malicious IPCPv6 option, " 3379 "dropping\n", ifp->if_xname); 3380 goto drop; 3381 } 3382 if (debug) 3383 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3384 switch (*p) { 3385 case IPV6CP_OPT_IFID: 3386 if (len >= 10 && l == 10 && ifidcount == 0) { 3387 /* correctly formed address option */ 3388 ifidcount++; 3389 continue; 3390 } 3391 if (debug) 3392 addlog(" [invalid]"); 3393 break; 3394 #ifdef notyet 3395 case IPV6CP_OPT_COMPRESSION: 3396 if (len >= 4 && l >= 4) { 3397 /* correctly formed compress option */ 3398 continue; 3399 } 3400 if (debug) 3401 addlog(" [invalid]"); 3402 break; 3403 #endif 3404 default: 3405 /* Others not supported. */ 3406 if (debug) 3407 addlog(" [rej]"); 3408 break; 3409 } 3410 if (rlen + l > blen) { 3411 if (debug) 3412 addlog(" [overflow]"); 3413 continue; 3414 } 3415 /* Add the option to rejected list. */ 3416 memcpy(r, p, l); 3417 r += l; 3418 rlen += l; 3419 } 3420 if (rlen) { 3421 if (debug) 3422 addlog(" send conf-rej\n"); 3423 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3424 goto end; 3425 } else if (debug) 3426 addlog("\n"); 3427 3428 /* pass 2: parse option values */ 3429 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3430 if (debug) 3431 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3432 ifp->if_xname); 3433 p = (void *)(h + 1); 3434 len = origlen; 3435 type = CONF_ACK; 3436 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3437 if (debug) 3438 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3439 switch (*p) { 3440 #ifdef notyet 3441 case IPV6CP_OPT_COMPRESSION: 3442 continue; 3443 #endif 3444 case IPV6CP_OPT_IFID: 3445 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3446 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3447 collision = (memcmp(&desiredaddr.s6_addr[8], 3448 &myaddr.s6_addr[8], 8) == 0); 3449 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3450 3451 desiredaddr.s6_addr16[0] = htons(0xfe80); 3452 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3453 3454 if (!collision && !nohisaddr) { 3455 /* no collision, hisaddr known - Conf-Ack */ 3456 type = CONF_ACK; 3457 3458 if (debug) { 3459 addlog(" %s [%s]", 3460 ip6_sprintf(&desiredaddr), 3461 sppp_cp_type_name(type)); 3462 } 3463 continue; 3464 } 3465 3466 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3467 if (collision && nohisaddr) { 3468 /* collision, hisaddr unknown - Conf-Rej */ 3469 type = CONF_REJ; 3470 memset(&p[2], 0, 8); 3471 } else { 3472 /* 3473 * - no collision, hisaddr unknown, or 3474 * - collision, hisaddr known 3475 * Conf-Nak, suggest hisaddr 3476 */ 3477 type = CONF_NAK; 3478 sppp_suggest_ip6_addr(sp, &suggestaddr); 3479 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3480 } 3481 if (debug) 3482 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3483 sppp_cp_type_name(type)); 3484 break; 3485 } 3486 if (rlen + l > blen) { 3487 if (debug) 3488 addlog(" [overflow]"); 3489 continue; 3490 } 3491 /* Add the option to nak'ed list. */ 3492 memcpy(r, p, l); 3493 r += l; 3494 rlen += l; 3495 } 3496 3497 if (rlen == 0 && type == CONF_ACK) { 3498 if (debug) 3499 addlog(" send %s\n", sppp_cp_type_name(type)); 3500 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3501 } else { 3502 #ifdef notdef 3503 if (type == CONF_ACK) 3504 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3505 #endif 3506 3507 if (debug) { 3508 addlog(" send %s suggest %s\n", 3509 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3510 } 3511 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3512 } 3513 3514 end: 3515 free(buf, M_TEMP); 3516 return (rlen == 0); 3517 3518 drop: 3519 free(buf, M_TEMP); 3520 return -1; 3521 } 3522 3523 /* 3524 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3525 * negotiation. 3526 */ 3527 static void 3528 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3529 { 3530 u_char *buf, *p, l, blen; 3531 struct ifnet *ifp = &sp->pp_if; 3532 int debug = ifp->if_flags & IFF_DEBUG; 3533 3534 len -= 4; 3535 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3536 if (!buf) 3537 return; 3538 3539 if (debug) 3540 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3541 ifp->if_xname); 3542 3543 p = (void *)(h + 1); 3544 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3545 if (l > len) { 3546 /* XXX just RXJ? */ 3547 addlog("%s: received malicious IPCPv6 option, " 3548 "dropping\n", ifp->if_xname); 3549 goto drop; 3550 } 3551 if (debug) 3552 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3553 switch (*p) { 3554 case IPV6CP_OPT_IFID: 3555 /* 3556 * Peer doesn't grok address option. This is 3557 * bad. XXX Should we better give up here? 3558 */ 3559 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3560 break; 3561 #ifdef notyet 3562 case IPV6CP_OPT_COMPRESS: 3563 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3564 break; 3565 #endif 3566 } 3567 } 3568 if (debug) 3569 addlog("\n"); 3570 drop: 3571 free(buf, M_TEMP); 3572 return; 3573 } 3574 3575 /* 3576 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3577 * negotiation. 3578 */ 3579 static void 3580 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3581 { 3582 u_char *buf, *p, l, blen; 3583 struct ifnet *ifp = &sp->pp_if; 3584 int debug = ifp->if_flags & IFF_DEBUG; 3585 struct in6_addr suggestaddr; 3586 3587 len -= 4; 3588 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3589 if (!buf) 3590 return; 3591 3592 if (debug) 3593 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3594 ifp->if_xname); 3595 3596 p = (void *)(h + 1); 3597 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3598 if (l > len) { 3599 /* XXX just RXJ? */ 3600 addlog("%s: received malicious IPCPv6 option, " 3601 "dropping\n", ifp->if_xname); 3602 goto drop; 3603 } 3604 if (debug) 3605 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3606 switch (*p) { 3607 case IPV6CP_OPT_IFID: 3608 /* 3609 * Peer doesn't like our local ifid. See 3610 * if we can do something for him. We'll drop 3611 * him our address then. 3612 */ 3613 if (len < 10 || l != 10) 3614 break; 3615 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3616 suggestaddr.s6_addr16[0] = htons(0xfe80); 3617 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3618 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3619 3620 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3621 if (debug) 3622 addlog(" [suggestaddr %s]", 3623 ip6_sprintf(&suggestaddr)); 3624 #ifdef IPV6CP_MYIFID_DYN 3625 /* 3626 * When doing dynamic address assignment, 3627 * we accept his offer. 3628 */ 3629 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3630 struct in6_addr lastsuggest; 3631 /* 3632 * If <suggested myaddr from peer> equals to 3633 * <hisaddr we have suggested last time>, 3634 * we have a collision. generate new random 3635 * ifid. 3636 */ 3637 sppp_suggest_ip6_addr(&lastsuggest); 3638 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3639 lastsuggest)) { 3640 if (debug) 3641 addlog(" [random]"); 3642 sppp_gen_ip6_addr(sp, &suggestaddr); 3643 } 3644 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3645 if (debug) 3646 addlog(" [agree]"); 3647 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3648 } 3649 #else 3650 /* 3651 * Since we do not do dynamic address assignment, 3652 * we ignore it and thus continue to negotiate 3653 * our already existing value. This can possibly 3654 * go into infinite request-reject loop. 3655 * 3656 * This is not likely because we normally use 3657 * ifid based on MAC-address. 3658 * If you have no ethernet card on the node, too bad. 3659 * XXX should we use fail_counter? 3660 */ 3661 #endif 3662 break; 3663 #ifdef notyet 3664 case IPV6CP_OPT_COMPRESS: 3665 /* 3666 * Peer wants different compression parameters. 3667 */ 3668 break; 3669 #endif 3670 } 3671 } 3672 if (debug) 3673 addlog("\n"); 3674 drop: 3675 free(buf, M_TEMP); 3676 return; 3677 } 3678 3679 static void 3680 sppp_ipv6cp_tlu(struct sppp *sp) 3681 { 3682 /* we are up - notify isdn daemon */ 3683 if (sp->pp_con) 3684 sp->pp_con(sp); 3685 } 3686 3687 static void 3688 sppp_ipv6cp_tld(struct sppp *sp) 3689 { 3690 } 3691 3692 static void 3693 sppp_ipv6cp_tls(struct sppp *sp) 3694 { 3695 /* indicate to LCP that it must stay alive */ 3696 sp->lcp.protos |= (1 << IDX_IPV6CP); 3697 } 3698 3699 static void 3700 sppp_ipv6cp_tlf(struct sppp *sp) 3701 { 3702 /* we no longer need LCP */ 3703 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3704 } 3705 3706 static void 3707 sppp_ipv6cp_scr(struct sppp *sp) 3708 { 3709 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3710 struct in6_addr ouraddr; 3711 int i = 0; 3712 3713 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3714 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3715 opt[i++] = IPV6CP_OPT_IFID; 3716 opt[i++] = 10; 3717 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3718 i += 8; 3719 } 3720 3721 #ifdef notyet 3722 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3723 opt[i++] = IPV6CP_OPT_COMPRESSION; 3724 opt[i++] = 4; 3725 opt[i++] = 0; /* TBD */ 3726 opt[i++] = 0; /* TBD */ 3727 /* variable length data may follow */ 3728 } 3729 #endif 3730 3731 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3732 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3733 } 3734 #else /*INET6*/ 3735 static void 3736 sppp_ipv6cp_init(struct sppp *sp) 3737 { 3738 } 3739 3740 static void 3741 sppp_ipv6cp_up(struct sppp *sp) 3742 { 3743 } 3744 3745 static void 3746 sppp_ipv6cp_down(struct sppp *sp) 3747 { 3748 } 3749 3750 static void 3751 sppp_ipv6cp_open(struct sppp *sp) 3752 { 3753 } 3754 3755 static void 3756 sppp_ipv6cp_close(struct sppp *sp) 3757 { 3758 } 3759 3760 static void 3761 sppp_ipv6cp_TO(void *sp) 3762 { 3763 } 3764 3765 static int 3766 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3767 int len) 3768 { 3769 return 0; 3770 } 3771 3772 static void 3773 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3774 int len) 3775 { 3776 } 3777 3778 static void 3779 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3780 int len) 3781 { 3782 } 3783 3784 static void 3785 sppp_ipv6cp_tlu(struct sppp *sp) 3786 { 3787 } 3788 3789 static void 3790 sppp_ipv6cp_tld(struct sppp *sp) 3791 { 3792 } 3793 3794 static void 3795 sppp_ipv6cp_tls(struct sppp *sp) 3796 { 3797 } 3798 3799 static void 3800 sppp_ipv6cp_tlf(struct sppp *sp) 3801 { 3802 } 3803 3804 static void 3805 sppp_ipv6cp_scr(struct sppp *sp) 3806 { 3807 } 3808 #endif /*INET6*/ 3809 3810 3811 /* 3812 *--------------------------------------------------------------------------* 3813 * * 3814 * The CHAP implementation. * 3815 * * 3816 *--------------------------------------------------------------------------* 3817 */ 3818 3819 /* 3820 * The authentication protocols don't employ a full-fledged state machine as 3821 * the control protocols do, since they do have Open and Close events, but 3822 * not Up and Down, nor are they explicitly terminated. Also, use of the 3823 * authentication protocols may be different in both directions (this makes 3824 * sense, think of a machine that never accepts incoming calls but only 3825 * calls out, it doesn't require the called party to authenticate itself). 3826 * 3827 * Our state machine for the local authentication protocol (we are requesting 3828 * the peer to authenticate) looks like: 3829 * 3830 * RCA- 3831 * +--------------------------------------------+ 3832 * V scn,tld| 3833 * +--------+ Close +---------+ RCA+ 3834 * | |<----------------------------------| |------+ 3835 * +--->| Closed | TO* | Opened | sca | 3836 * | | |-----+ +-------| |<-----+ 3837 * | +--------+ irc | | +---------+ 3838 * | ^ | | ^ 3839 * | | | | | 3840 * | | | | | 3841 * | TO-| | | | 3842 * | |tld TO+ V | | 3843 * | | +------->+ | | 3844 * | | | | | | 3845 * | +--------+ V | | 3846 * | | |<----+<--------------------+ | 3847 * | | Req- | scr | 3848 * | | Sent | | 3849 * | | | | 3850 * | +--------+ | 3851 * | RCA- | | RCA+ | 3852 * +------+ +------------------------------------------+ 3853 * scn,tld sca,irc,ict,tlu 3854 * 3855 * 3856 * with: 3857 * 3858 * Open: LCP reached authentication phase 3859 * Close: LCP reached terminate phase 3860 * 3861 * RCA+: received reply (pap-req, chap-response), acceptable 3862 * RCN: received reply (pap-req, chap-response), not acceptable 3863 * TO+: timeout with restart counter >= 0 3864 * TO-: timeout with restart counter < 0 3865 * TO*: reschedule timeout for CHAP 3866 * 3867 * scr: send request packet (none for PAP, chap-challenge) 3868 * sca: send ack packet (pap-ack, chap-success) 3869 * scn: send nak packet (pap-nak, chap-failure) 3870 * ict: initialize re-challenge timer (CHAP only) 3871 * 3872 * tlu: this-layer-up, LCP reaches network phase 3873 * tld: this-layer-down, LCP enters terminate phase 3874 * 3875 * Note that in CHAP mode, after sending a new challenge, while the state 3876 * automaton falls back into Req-Sent state, it doesn't signal a tld 3877 * event to LCP, so LCP remains in network phase. Only after not getting 3878 * any response (or after getting an unacceptable response), CHAP closes, 3879 * causing LCP to enter terminate phase. 3880 * 3881 * With PAP, there is no initial request that can be sent. The peer is 3882 * expected to send one based on the successful negotiation of PAP as 3883 * the authentication protocol during the LCP option negotiation. 3884 * 3885 * Incoming authentication protocol requests (remote requests 3886 * authentication, we are peer) don't employ a state machine at all, 3887 * they are simply answered. Some peers [Ascend P50 firmware rev 3888 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3889 * still in authentication phase (thereby violating the standard that 3890 * demands that these NCP packets are to be discarded), so we keep 3891 * track of the peer demanding us to authenticate, and only proceed to 3892 * phase network once we've seen a positive acknowledge for the 3893 * authentication. 3894 */ 3895 3896 /* 3897 * Handle incoming CHAP packets. 3898 */ 3899 void 3900 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3901 { 3902 STDDCL; 3903 struct lcp_header *h; 3904 int len, x; 3905 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3906 int value_len, name_len; 3907 MD5_CTX ctx; 3908 3909 len = m->m_pkthdr.len; 3910 if (len < 4) { 3911 if (debug) 3912 log(LOG_DEBUG, 3913 "%s: chap invalid packet length: %d bytes\n", 3914 ifp->if_xname, len); 3915 return; 3916 } 3917 h = mtod(m, struct lcp_header *); 3918 if (len > ntohs(h->len)) 3919 len = ntohs(h->len); 3920 3921 switch (h->type) { 3922 /* challenge, failure and success are his authproto */ 3923 case CHAP_CHALLENGE: 3924 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3925 /* can't do anything useful */ 3926 sp->pp_auth_failures++; 3927 printf("%s: chap input without my name and my secret being set\n", 3928 ifp->if_xname); 3929 break; 3930 } 3931 value = 1 + (u_char *)(h + 1); 3932 value_len = value[-1]; 3933 name = value + value_len; 3934 name_len = len - value_len - 5; 3935 if (name_len < 0) { 3936 if (debug) { 3937 log(LOG_DEBUG, 3938 "%s: chap corrupted challenge " 3939 "<%s id=0x%x len=%d", 3940 ifp->if_xname, 3941 sppp_auth_type_name(PPP_CHAP, h->type), 3942 h->ident, ntohs(h->len)); 3943 if (len > 4) 3944 sppp_print_bytes((u_char *)(h + 1), 3945 len - 4); 3946 addlog(">\n"); 3947 } 3948 break; 3949 } 3950 3951 if (debug) { 3952 log(LOG_DEBUG, 3953 "%s: chap input <%s id=0x%x len=%d name=", 3954 ifp->if_xname, 3955 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3956 ntohs(h->len)); 3957 sppp_print_string((char *) name, name_len); 3958 addlog(" value-size=%d value=", value_len); 3959 sppp_print_bytes(value, value_len); 3960 addlog(">\n"); 3961 } 3962 3963 /* Compute reply value. */ 3964 MD5Init(&ctx); 3965 MD5Update(&ctx, &h->ident, 1); 3966 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3967 MD5Update(&ctx, value, value_len); 3968 MD5Final(digest, &ctx); 3969 dsize = sizeof digest; 3970 3971 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3972 sizeof dsize, (const char *)&dsize, 3973 sizeof digest, digest, 3974 sp->myauth.name_len, 3975 sp->myauth.name, 3976 0); 3977 break; 3978 3979 case CHAP_SUCCESS: 3980 if (debug) { 3981 log(LOG_DEBUG, "%s: chap success", 3982 ifp->if_xname); 3983 if (len > 4) { 3984 addlog(": "); 3985 sppp_print_string((char *)(h + 1), len - 4); 3986 } 3987 addlog("\n"); 3988 } 3989 x = splnet(); 3990 sp->pp_auth_failures = 0; 3991 sp->pp_flags &= ~PP_NEEDAUTH; 3992 if (sp->myauth.proto == PPP_CHAP && 3993 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3994 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3995 /* 3996 * We are authenticator for CHAP but didn't 3997 * complete yet. Leave it to tlu to proceed 3998 * to network phase. 3999 */ 4000 splx(x); 4001 break; 4002 } 4003 splx(x); 4004 sppp_phase_network(sp); 4005 break; 4006 4007 case CHAP_FAILURE: 4008 x = splnet(); 4009 sp->pp_auth_failures++; 4010 splx(x); 4011 if (debug) { 4012 log(LOG_INFO, "%s: chap failure", 4013 ifp->if_xname); 4014 if (len > 4) { 4015 addlog(": "); 4016 sppp_print_string((char *)(h + 1), len - 4); 4017 } 4018 addlog("\n"); 4019 } else 4020 log(LOG_INFO, "%s: chap failure\n", 4021 ifp->if_xname); 4022 /* await LCP shutdown by authenticator */ 4023 break; 4024 4025 /* response is my authproto */ 4026 case CHAP_RESPONSE: 4027 if (sp->hisauth.secret == NULL) { 4028 /* can't do anything useful */ 4029 printf("%s: chap input without his secret being set\n", 4030 ifp->if_xname); 4031 break; 4032 } 4033 value = 1 + (u_char *)(h + 1); 4034 value_len = value[-1]; 4035 name = value + value_len; 4036 name_len = len - value_len - 5; 4037 if (name_len < 0) { 4038 if (debug) { 4039 log(LOG_DEBUG, 4040 "%s: chap corrupted response " 4041 "<%s id=0x%x len=%d", 4042 ifp->if_xname, 4043 sppp_auth_type_name(PPP_CHAP, h->type), 4044 h->ident, ntohs(h->len)); 4045 if (len > 4) 4046 sppp_print_bytes((u_char *)(h + 1), 4047 len - 4); 4048 addlog(">\n"); 4049 } 4050 break; 4051 } 4052 if (h->ident != sp->confid[IDX_CHAP]) { 4053 if (debug) 4054 log(LOG_DEBUG, 4055 "%s: chap dropping response for old ID " 4056 "(got %d, expected %d)\n", 4057 ifp->if_xname, 4058 h->ident, sp->confid[IDX_CHAP]); 4059 break; 4060 } 4061 if (sp->hisauth.name != NULL && 4062 (name_len != sp->hisauth.name_len 4063 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4064 log(LOG_INFO, "%s: chap response, his name ", 4065 ifp->if_xname); 4066 sppp_print_string(name, name_len); 4067 addlog(" != expected "); 4068 sppp_print_string(sp->hisauth.name, 4069 sp->hisauth.name_len); 4070 addlog("\n"); 4071 goto chap_failure; 4072 } 4073 if (debug) { 4074 log(LOG_DEBUG, "%s: chap input(%s) " 4075 "<%s id=0x%x len=%d name=", 4076 ifp->if_xname, 4077 sppp_state_name(sp->state[IDX_CHAP]), 4078 sppp_auth_type_name(PPP_CHAP, h->type), 4079 h->ident, ntohs(h->len)); 4080 sppp_print_string((char *)name, name_len); 4081 addlog(" value-size=%d value=", value_len); 4082 sppp_print_bytes(value, value_len); 4083 addlog(">\n"); 4084 } 4085 if (value_len != sizeof(sp->hisauth.challenge)) { 4086 if (debug) 4087 log(LOG_DEBUG, 4088 "%s: chap bad hash value length: " 4089 "%d bytes, should be %zu\n", 4090 ifp->if_xname, value_len, 4091 sizeof(sp->hisauth.challenge)); 4092 goto chap_failure; 4093 } 4094 4095 MD5Init(&ctx); 4096 MD5Update(&ctx, &h->ident, 1); 4097 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4098 MD5Update(&ctx, sp->hisauth.challenge, sizeof(sp->hisauth.challenge)); 4099 MD5Final(digest, &ctx); 4100 4101 #define FAILMSG "Failed..." 4102 #define SUCCMSG "Welcome!" 4103 4104 if (value_len != sizeof digest || 4105 memcmp(digest, value, value_len) != 0) { 4106 chap_failure: 4107 /* action scn, tld */ 4108 x = splnet(); 4109 sp->pp_auth_failures++; 4110 splx(x); 4111 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4112 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4113 0); 4114 chap.tld(sp); 4115 break; 4116 } 4117 sp->pp_auth_failures = 0; 4118 /* action sca, perhaps tlu */ 4119 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4120 sp->state[IDX_CHAP] == STATE_OPENED) 4121 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4122 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4123 0); 4124 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4125 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4126 chap.tlu(sp); 4127 } 4128 break; 4129 4130 default: 4131 /* Unknown CHAP packet type -- ignore. */ 4132 if (debug) { 4133 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4134 "<0x%x id=0x%xh len=%d", 4135 ifp->if_xname, 4136 sppp_state_name(sp->state[IDX_CHAP]), 4137 h->type, h->ident, ntohs(h->len)); 4138 if (len > 4) 4139 sppp_print_bytes((u_char *)(h + 1), len - 4); 4140 addlog(">\n"); 4141 } 4142 break; 4143 4144 } 4145 } 4146 4147 static void 4148 sppp_chap_init(struct sppp *sp) 4149 { 4150 /* Chap doesn't have STATE_INITIAL at all. */ 4151 sp->state[IDX_CHAP] = STATE_CLOSED; 4152 sp->fail_counter[IDX_CHAP] = 0; 4153 sp->pp_seq[IDX_CHAP] = 0; 4154 sp->pp_rseq[IDX_CHAP] = 0; 4155 callout_init(&sp->ch[IDX_CHAP], 0); 4156 } 4157 4158 static void 4159 sppp_chap_open(struct sppp *sp) 4160 { 4161 if (sp->hisauth.proto == PPP_CHAP && 4162 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4163 /* we are authenticator for CHAP, start it */ 4164 chap.scr(sp); 4165 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4166 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4167 } 4168 /* nothing to be done if we are peer, await a challenge */ 4169 } 4170 4171 static void 4172 sppp_chap_close(struct sppp *sp) 4173 { 4174 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4175 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4176 } 4177 4178 static void 4179 sppp_chap_TO(void *cookie) 4180 { 4181 struct sppp *sp = (struct sppp *)cookie; 4182 STDDCL; 4183 int s; 4184 4185 s = splnet(); 4186 if (debug) 4187 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4188 ifp->if_xname, 4189 sppp_state_name(sp->state[IDX_CHAP]), 4190 sp->rst_counter[IDX_CHAP]); 4191 4192 if (--sp->rst_counter[IDX_CHAP] < 0) 4193 /* TO- event */ 4194 switch (sp->state[IDX_CHAP]) { 4195 case STATE_REQ_SENT: 4196 chap.tld(sp); 4197 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4198 break; 4199 } 4200 else 4201 /* TO+ (or TO*) event */ 4202 switch (sp->state[IDX_CHAP]) { 4203 case STATE_OPENED: 4204 /* TO* event */ 4205 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4206 /* fall through */ 4207 case STATE_REQ_SENT: 4208 chap.scr(sp); 4209 /* sppp_cp_change_state() will restart the timer */ 4210 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4211 break; 4212 } 4213 4214 splx(s); 4215 } 4216 4217 static void 4218 sppp_chap_tlu(struct sppp *sp) 4219 { 4220 STDDCL; 4221 int i, x; 4222 4223 i = 0; 4224 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4225 4226 /* 4227 * Some broken CHAP implementations (Conware CoNet, firmware 4228 * 4.0.?) don't want to re-authenticate their CHAP once the 4229 * initial challenge-response exchange has taken place. 4230 * Provide for an option to avoid rechallenges. 4231 */ 4232 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4233 /* 4234 * Compute the re-challenge timeout. This will yield 4235 * a number between 300 and 810 seconds. 4236 */ 4237 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4238 4239 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4240 } 4241 4242 if (debug) { 4243 log(LOG_DEBUG, 4244 "%s: chap %s, ", 4245 ifp->if_xname, 4246 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4247 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4248 addlog("next re-challenge in %d seconds\n", i); 4249 else 4250 addlog("re-challenging supressed\n"); 4251 } 4252 4253 x = splnet(); 4254 sp->pp_auth_failures = 0; 4255 /* indicate to LCP that we need to be closed down */ 4256 sp->lcp.protos |= (1 << IDX_CHAP); 4257 4258 if (sp->pp_flags & PP_NEEDAUTH) { 4259 /* 4260 * Remote is authenticator, but his auth proto didn't 4261 * complete yet. Defer the transition to network 4262 * phase. 4263 */ 4264 splx(x); 4265 return; 4266 } 4267 splx(x); 4268 4269 /* 4270 * If we are already in phase network, we are done here. This 4271 * is the case if this is a dummy tlu event after a re-challenge. 4272 */ 4273 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4274 sppp_phase_network(sp); 4275 } 4276 4277 static void 4278 sppp_chap_tld(struct sppp *sp) 4279 { 4280 STDDCL; 4281 4282 if (debug) 4283 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4284 callout_stop(&sp->ch[IDX_CHAP]); 4285 sp->lcp.protos &= ~(1 << IDX_CHAP); 4286 4287 lcp.Close(sp); 4288 } 4289 4290 static void 4291 sppp_chap_scr(struct sppp *sp) 4292 { 4293 uint32_t *ch; 4294 u_char clen = 4 * sizeof(uint32_t); 4295 4296 if (sp->hisauth.name == NULL) { 4297 /* can't do anything useful */ 4298 printf("%s: chap starting without his name being set\n", 4299 sp->pp_if.if_xname); 4300 return; 4301 } 4302 4303 /* Compute random challenge. */ 4304 ch = (uint32_t *)sp->hisauth.challenge; 4305 cprng_strong(kern_cprng, ch, clen, 0); 4306 4307 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4308 4309 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4310 sizeof clen, (const char *)&clen, 4311 sizeof(sp->hisauth.challenge), sp->hisauth.challenge, 4312 0); 4313 } 4314 4315 /* 4316 *--------------------------------------------------------------------------* 4317 * * 4318 * The PAP implementation. * 4319 * * 4320 *--------------------------------------------------------------------------* 4321 */ 4322 /* 4323 * For PAP, we need to keep a little state also if we are the peer, not the 4324 * authenticator. This is since we don't get a request to authenticate, but 4325 * have to repeatedly authenticate ourself until we got a response (or the 4326 * retry counter is expired). 4327 */ 4328 4329 /* 4330 * Handle incoming PAP packets. */ 4331 static void 4332 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4333 { 4334 STDDCL; 4335 struct lcp_header *h; 4336 int len, x; 4337 u_char mlen; 4338 char *name, *secret; 4339 int name_len, secret_len; 4340 4341 /* 4342 * Malicious input might leave this uninitialized, so 4343 * init to an impossible value. 4344 */ 4345 secret_len = -1; 4346 4347 len = m->m_pkthdr.len; 4348 if (len < 5) { 4349 if (debug) 4350 log(LOG_DEBUG, 4351 "%s: pap invalid packet length: %d bytes\n", 4352 ifp->if_xname, len); 4353 return; 4354 } 4355 h = mtod(m, struct lcp_header *); 4356 if (len > ntohs(h->len)) 4357 len = ntohs(h->len); 4358 switch (h->type) { 4359 /* PAP request is my authproto */ 4360 case PAP_REQ: 4361 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4362 /* can't do anything useful */ 4363 printf("%s: pap request without his name and his secret being set\n", 4364 ifp->if_xname); 4365 break; 4366 } 4367 name = 1 + (u_char *)(h + 1); 4368 name_len = name[-1]; 4369 secret = name + name_len + 1; 4370 if (name_len > len - 6 || 4371 (secret_len = secret[-1]) > len - 6 - name_len) { 4372 if (debug) { 4373 log(LOG_DEBUG, "%s: pap corrupted input " 4374 "<%s id=0x%x len=%d", 4375 ifp->if_xname, 4376 sppp_auth_type_name(PPP_PAP, h->type), 4377 h->ident, ntohs(h->len)); 4378 if (len > 4) 4379 sppp_print_bytes((u_char *)(h + 1), 4380 len - 4); 4381 addlog(">\n"); 4382 } 4383 break; 4384 } 4385 if (debug) { 4386 log(LOG_DEBUG, "%s: pap input(%s) " 4387 "<%s id=0x%x len=%d name=", 4388 ifp->if_xname, 4389 sppp_state_name(sp->state[IDX_PAP]), 4390 sppp_auth_type_name(PPP_PAP, h->type), 4391 h->ident, ntohs(h->len)); 4392 sppp_print_string((char *)name, name_len); 4393 addlog(" secret="); 4394 sppp_print_string((char *)secret, secret_len); 4395 addlog(">\n"); 4396 } 4397 if (name_len != sp->hisauth.name_len || 4398 secret_len != sp->hisauth.secret_len || 4399 memcmp(name, sp->hisauth.name, name_len) != 0 || 4400 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4401 /* action scn, tld */ 4402 sp->pp_auth_failures++; 4403 mlen = sizeof(FAILMSG) - 1; 4404 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4405 sizeof mlen, (const char *)&mlen, 4406 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4407 0); 4408 pap.tld(sp); 4409 break; 4410 } 4411 /* action sca, perhaps tlu */ 4412 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4413 sp->state[IDX_PAP] == STATE_OPENED) { 4414 mlen = sizeof(SUCCMSG) - 1; 4415 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4416 sizeof mlen, (const char *)&mlen, 4417 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4418 0); 4419 } 4420 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4421 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4422 pap.tlu(sp); 4423 } 4424 break; 4425 4426 /* ack and nak are his authproto */ 4427 case PAP_ACK: 4428 callout_stop(&sp->pap_my_to_ch); 4429 if (debug) { 4430 log(LOG_DEBUG, "%s: pap success", 4431 ifp->if_xname); 4432 name = 1 + (u_char *)(h + 1); 4433 name_len = name[-1]; 4434 if (len > 5 && name_len < len+4) { 4435 addlog(": "); 4436 sppp_print_string(name, name_len); 4437 } 4438 addlog("\n"); 4439 } 4440 x = splnet(); 4441 sp->pp_auth_failures = 0; 4442 sp->pp_flags &= ~PP_NEEDAUTH; 4443 if (sp->myauth.proto == PPP_PAP && 4444 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4445 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4446 /* 4447 * We are authenticator for PAP but didn't 4448 * complete yet. Leave it to tlu to proceed 4449 * to network phase. 4450 */ 4451 splx(x); 4452 break; 4453 } 4454 splx(x); 4455 sppp_phase_network(sp); 4456 break; 4457 4458 case PAP_NAK: 4459 callout_stop(&sp->pap_my_to_ch); 4460 sp->pp_auth_failures++; 4461 if (debug) { 4462 log(LOG_INFO, "%s: pap failure", 4463 ifp->if_xname); 4464 name = 1 + (u_char *)(h + 1); 4465 name_len = name[-1]; 4466 if (len > 5 && name_len < len+4) { 4467 addlog(": "); 4468 sppp_print_string(name, name_len); 4469 } 4470 addlog("\n"); 4471 } else 4472 log(LOG_INFO, "%s: pap failure\n", 4473 ifp->if_xname); 4474 /* await LCP shutdown by authenticator */ 4475 break; 4476 4477 default: 4478 /* Unknown PAP packet type -- ignore. */ 4479 if (debug) { 4480 log(LOG_DEBUG, "%s: pap corrupted input " 4481 "<0x%x id=0x%x len=%d", 4482 ifp->if_xname, 4483 h->type, h->ident, ntohs(h->len)); 4484 if (len > 4) 4485 sppp_print_bytes((u_char *)(h + 1), len - 4); 4486 addlog(">\n"); 4487 } 4488 break; 4489 4490 } 4491 } 4492 4493 static void 4494 sppp_pap_init(struct sppp *sp) 4495 { 4496 /* PAP doesn't have STATE_INITIAL at all. */ 4497 sp->state[IDX_PAP] = STATE_CLOSED; 4498 sp->fail_counter[IDX_PAP] = 0; 4499 sp->pp_seq[IDX_PAP] = 0; 4500 sp->pp_rseq[IDX_PAP] = 0; 4501 callout_init(&sp->ch[IDX_PAP], 0); 4502 callout_init(&sp->pap_my_to_ch, 0); 4503 } 4504 4505 static void 4506 sppp_pap_open(struct sppp *sp) 4507 { 4508 if (sp->hisauth.proto == PPP_PAP && 4509 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4510 /* we are authenticator for PAP, start our timer */ 4511 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4512 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4513 } 4514 if (sp->myauth.proto == PPP_PAP) { 4515 /* we are peer, send a request, and start a timer */ 4516 pap.scr(sp); 4517 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4518 sppp_pap_my_TO, sp); 4519 } 4520 } 4521 4522 static void 4523 sppp_pap_close(struct sppp *sp) 4524 { 4525 if (sp->state[IDX_PAP] != STATE_CLOSED) 4526 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4527 } 4528 4529 /* 4530 * That's the timeout routine if we are authenticator. Since the 4531 * authenticator is basically passive in PAP, we can't do much here. 4532 */ 4533 static void 4534 sppp_pap_TO(void *cookie) 4535 { 4536 struct sppp *sp = (struct sppp *)cookie; 4537 STDDCL; 4538 int s; 4539 4540 s = splnet(); 4541 if (debug) 4542 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4543 ifp->if_xname, 4544 sppp_state_name(sp->state[IDX_PAP]), 4545 sp->rst_counter[IDX_PAP]); 4546 4547 if (--sp->rst_counter[IDX_PAP] < 0) 4548 /* TO- event */ 4549 switch (sp->state[IDX_PAP]) { 4550 case STATE_REQ_SENT: 4551 pap.tld(sp); 4552 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4553 break; 4554 } 4555 else 4556 /* TO+ event, not very much we could do */ 4557 switch (sp->state[IDX_PAP]) { 4558 case STATE_REQ_SENT: 4559 /* sppp_cp_change_state() will restart the timer */ 4560 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4561 break; 4562 } 4563 4564 splx(s); 4565 } 4566 4567 /* 4568 * That's the timeout handler if we are peer. Since the peer is active, 4569 * we need to retransmit our PAP request since it is apparently lost. 4570 * XXX We should impose a max counter. 4571 */ 4572 static void 4573 sppp_pap_my_TO(void *cookie) 4574 { 4575 struct sppp *sp = (struct sppp *)cookie; 4576 STDDCL; 4577 4578 if (debug) 4579 log(LOG_DEBUG, "%s: pap peer TO\n", 4580 ifp->if_xname); 4581 4582 pap.scr(sp); 4583 } 4584 4585 static void 4586 sppp_pap_tlu(struct sppp *sp) 4587 { 4588 STDDCL; 4589 int x; 4590 4591 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4592 4593 if (debug) 4594 log(LOG_DEBUG, "%s: %s tlu\n", 4595 ifp->if_xname, pap.name); 4596 4597 x = splnet(); 4598 sp->pp_auth_failures = 0; 4599 /* indicate to LCP that we need to be closed down */ 4600 sp->lcp.protos |= (1 << IDX_PAP); 4601 4602 if (sp->pp_flags & PP_NEEDAUTH) { 4603 /* 4604 * Remote is authenticator, but his auth proto didn't 4605 * complete yet. Defer the transition to network 4606 * phase. 4607 */ 4608 splx(x); 4609 return; 4610 } 4611 splx(x); 4612 sppp_phase_network(sp); 4613 } 4614 4615 static void 4616 sppp_pap_tld(struct sppp *sp) 4617 { 4618 STDDCL; 4619 4620 if (debug) 4621 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4622 callout_stop(&sp->ch[IDX_PAP]); 4623 callout_stop(&sp->pap_my_to_ch); 4624 sp->lcp.protos &= ~(1 << IDX_PAP); 4625 4626 lcp.Close(sp); 4627 } 4628 4629 static void 4630 sppp_pap_scr(struct sppp *sp) 4631 { 4632 u_char idlen, pwdlen; 4633 4634 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4635 /* can't do anything useful */ 4636 printf("%s: pap starting without my name and secret being set\n", 4637 sp->pp_if.if_xname); 4638 return; 4639 } 4640 4641 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4642 pwdlen = sp->myauth.secret_len; 4643 idlen = sp->myauth.name_len; 4644 4645 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4646 sizeof idlen, (const char *)&idlen, 4647 idlen, sp->myauth.name, 4648 sizeof pwdlen, (const char *)&pwdlen, 4649 pwdlen, sp->myauth.secret, 4650 0); 4651 } 4652 4653 /* 4654 * Random miscellaneous functions. 4655 */ 4656 4657 /* 4658 * Send a PAP or CHAP proto packet. 4659 * 4660 * Varadic function, each of the elements for the ellipsis is of type 4661 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4662 * mlen == 0. 4663 * NOTE: never declare variadic functions with types subject to type 4664 * promotion (i.e. u_char). This is asking for big trouble depending 4665 * on the architecture you are on... 4666 */ 4667 4668 static void 4669 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4670 unsigned int type, unsigned int id, 4671 ...) 4672 { 4673 STDDCL; 4674 struct lcp_header *lh; 4675 struct mbuf *m; 4676 u_char *p; 4677 int len; 4678 size_t pkthdrlen; 4679 unsigned int mlen; 4680 const char *msg; 4681 va_list ap; 4682 4683 MGETHDR(m, M_DONTWAIT, MT_DATA); 4684 if (! m) 4685 return; 4686 m_reset_rcvif(m); 4687 4688 if (sp->pp_flags & PP_NOFRAMING) { 4689 *mtod(m, uint16_t *) = htons(cp->proto); 4690 pkthdrlen = 2; 4691 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4692 } else { 4693 struct ppp_header *h; 4694 h = mtod(m, struct ppp_header *); 4695 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4696 h->control = PPP_UI; /* Unnumbered Info */ 4697 h->protocol = htons(cp->proto); 4698 pkthdrlen = PPP_HEADER_LEN; 4699 4700 lh = (struct lcp_header *)(h + 1); 4701 } 4702 4703 lh->type = type; 4704 lh->ident = id; 4705 p = (u_char *)(lh + 1); 4706 4707 va_start(ap, id); 4708 len = 0; 4709 4710 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4711 msg = va_arg(ap, const char *); 4712 len += mlen; 4713 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4714 va_end(ap); 4715 m_freem(m); 4716 return; 4717 } 4718 4719 memcpy(p, msg, mlen); 4720 p += mlen; 4721 } 4722 va_end(ap); 4723 4724 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4725 lh->len = htons(LCP_HEADER_LEN + len); 4726 4727 if (debug) { 4728 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4729 ifp->if_xname, cp->name, 4730 sppp_auth_type_name(cp->proto, lh->type), 4731 lh->ident, ntohs(lh->len)); 4732 if (len) 4733 sppp_print_bytes((u_char *)(lh + 1), len); 4734 addlog(">\n"); 4735 } 4736 if (IF_QFULL(&sp->pp_cpq)) { 4737 IF_DROP(&sp->pp_fastq); 4738 IF_DROP(&ifp->if_snd); 4739 m_freem(m); 4740 ++ifp->if_oerrors; 4741 return; 4742 } else 4743 IF_ENQUEUE(&sp->pp_cpq, m); 4744 if (! (ifp->if_flags & IFF_OACTIVE)) 4745 if_start_lock(ifp); 4746 ifp->if_obytes += m->m_pkthdr.len + 3; 4747 } 4748 4749 /* 4750 * Send keepalive packets, every 10 seconds. 4751 */ 4752 static void 4753 sppp_keepalive(void *dummy) 4754 { 4755 struct sppp *sp; 4756 int s; 4757 time_t now; 4758 4759 s = splnet(); 4760 now = time_uptime; 4761 for (sp=spppq; sp; sp=sp->pp_next) { 4762 struct ifnet *ifp = &sp->pp_if; 4763 4764 /* check idle timeout */ 4765 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4766 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4767 /* idle timeout is enabled for this interface */ 4768 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4769 if (ifp->if_flags & IFF_DEBUG) 4770 printf("%s: no activity for %lu seconds\n", 4771 sp->pp_if.if_xname, 4772 (unsigned long)(now-sp->pp_last_activity)); 4773 lcp.Close(sp); 4774 continue; 4775 } 4776 } 4777 4778 /* Keepalive mode disabled or channel down? */ 4779 if (! (sp->pp_flags & PP_KEEPALIVE) || 4780 ! (ifp->if_flags & IFF_RUNNING)) 4781 continue; 4782 4783 /* No keepalive in PPP mode if LCP not opened yet. */ 4784 if (! (sp->pp_flags & PP_CISCO) && 4785 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4786 continue; 4787 4788 /* No echo reply, but maybe user data passed through? */ 4789 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4790 sp->pp_alivecnt = 0; 4791 continue; 4792 } 4793 4794 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4795 /* No keepalive packets got. Stop the interface. */ 4796 if_down (ifp); 4797 IF_PURGE(&sp->pp_cpq); 4798 if (! (sp->pp_flags & PP_CISCO)) { 4799 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4800 ifp->if_xname); 4801 sp->pp_alivecnt = 0; 4802 4803 /* we are down, close all open protocols */ 4804 lcp.Close(sp); 4805 4806 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4807 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4808 4809 /* Close connection immediately, completition of this 4810 * will summon the magic needed to reestablish it. */ 4811 if (sp->pp_tlf) 4812 sp->pp_tlf(sp); 4813 continue; 4814 } 4815 } 4816 if (sp->pp_alivecnt < sp->pp_maxalive) 4817 ++sp->pp_alivecnt; 4818 if (sp->pp_flags & PP_CISCO) 4819 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4820 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4821 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4822 int32_t nmagic = htonl(sp->lcp.magic); 4823 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4824 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4825 sp->lcp.echoid, 4, &nmagic); 4826 } 4827 } 4828 splx(s); 4829 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4830 } 4831 4832 #ifdef INET 4833 /* 4834 * Get both IP addresses. 4835 */ 4836 static void 4837 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4838 { 4839 struct ifnet *ifp = &sp->pp_if; 4840 struct ifaddr *ifa; 4841 struct sockaddr_in *si, *sm; 4842 uint32_t ssrc, ddst; 4843 4844 sm = NULL; 4845 ssrc = ddst = 0; 4846 /* 4847 * Pick the first AF_INET address from the list, 4848 * aliases don't make any sense on a p2p link anyway. 4849 */ 4850 si = 0; 4851 IFADDR_READER_FOREACH(ifa, ifp) { 4852 if (ifa->ifa_addr->sa_family == AF_INET) { 4853 si = (struct sockaddr_in *)ifa->ifa_addr; 4854 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4855 if (si) 4856 break; 4857 } 4858 } 4859 if (ifa) { 4860 if (si && si->sin_addr.s_addr) { 4861 ssrc = si->sin_addr.s_addr; 4862 if (srcmask) 4863 *srcmask = ntohl(sm->sin_addr.s_addr); 4864 } 4865 4866 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4867 if (si && si->sin_addr.s_addr) 4868 ddst = si->sin_addr.s_addr; 4869 } 4870 4871 if (dst) *dst = ntohl(ddst); 4872 if (src) *src = ntohl(ssrc); 4873 } 4874 4875 /* 4876 * Set IP addresses. Must be called at splnet. 4877 * If an address is 0, leave it the way it is. 4878 */ 4879 static void 4880 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4881 { 4882 STDDCL; 4883 struct ifaddr *ifa; 4884 struct sockaddr_in *si, *dest; 4885 4886 /* 4887 * Pick the first AF_INET address from the list, 4888 * aliases don't make any sense on a p2p link anyway. 4889 */ 4890 4891 IFADDR_READER_FOREACH(ifa, ifp) { 4892 if (ifa->ifa_addr->sa_family == AF_INET) { 4893 si = (struct sockaddr_in *)ifa->ifa_addr; 4894 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4895 goto found; 4896 } 4897 } 4898 return; 4899 4900 found: 4901 { 4902 int error, hostIsNew; 4903 struct sockaddr_in new_sin = *si; 4904 struct sockaddr_in new_dst = *dest; 4905 4906 /* 4907 * Scrub old routes now instead of calling in_ifinit with 4908 * scrub=1, because we may change the dstaddr 4909 * before the call to in_ifinit. 4910 */ 4911 in_ifscrub(ifp, ifatoia(ifa)); 4912 4913 hostIsNew = 0; 4914 if (myaddr != 0) { 4915 if (new_sin.sin_addr.s_addr != htonl(myaddr)) { 4916 new_sin.sin_addr.s_addr = htonl(myaddr); 4917 hostIsNew = 1; 4918 } 4919 } 4920 if (hisaddr != 0) { 4921 new_dst.sin_addr.s_addr = htonl(hisaddr); 4922 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4923 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4924 *dest = new_dst; /* fix dstaddr in place */ 4925 } 4926 } 4927 4928 LIST_REMOVE(ifatoia(ifa), ia_hash); 4929 IN_ADDRHASH_WRITER_REMOVE(ifatoia(ifa)); 4930 4931 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0, hostIsNew); 4932 4933 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ifatoia(ifa)->ia_addr.sin_addr.s_addr), 4934 ifatoia(ifa), ia_hash); 4935 IN_ADDRHASH_WRITER_INSERT_HEAD(ifatoia(ifa)); 4936 4937 if (debug && error) 4938 { 4939 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4940 " failed, error=%d\n", ifp->if_xname, error); 4941 } 4942 if (!error) { 4943 (void)pfil_run_hooks(if_pfil, 4944 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4945 } 4946 } 4947 } 4948 4949 /* 4950 * Clear IP addresses. Must be called at splnet. 4951 */ 4952 static void 4953 sppp_clear_ip_addrs(struct sppp *sp) 4954 { 4955 struct ifnet *ifp = &sp->pp_if; 4956 struct ifaddr *ifa; 4957 struct sockaddr_in *si, *dest; 4958 4959 uint32_t remote; 4960 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4961 remote = sp->ipcp.saved_hisaddr; 4962 else 4963 sppp_get_ip_addrs(sp, 0, &remote, 0); 4964 4965 /* 4966 * Pick the first AF_INET address from the list, 4967 * aliases don't make any sense on a p2p link anyway. 4968 */ 4969 4970 IFADDR_READER_FOREACH(ifa, ifp) { 4971 if (ifa->ifa_addr->sa_family == AF_INET) { 4972 si = (struct sockaddr_in *)ifa->ifa_addr; 4973 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4974 goto found; 4975 } 4976 } 4977 return; 4978 4979 found: 4980 { 4981 struct sockaddr_in new_sin = *si; 4982 4983 in_ifscrub(ifp, ifatoia(ifa)); 4984 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4985 new_sin.sin_addr.s_addr = 0; 4986 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4987 /* replace peer addr in place */ 4988 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4989 4990 LIST_REMOVE(ifatoia(ifa), ia_hash); 4991 IN_ADDRHASH_WRITER_REMOVE(ifatoia(ifa)); 4992 4993 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0, 0); 4994 4995 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ifatoia(ifa)->ia_addr.sin_addr.s_addr), 4996 ifatoia(ifa), ia_hash); 4997 IN_ADDRHASH_WRITER_INSERT_HEAD(ifatoia(ifa)); 4998 4999 (void)pfil_run_hooks(if_pfil, 5000 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 5001 } 5002 } 5003 #endif 5004 5005 #ifdef INET6 5006 /* 5007 * Get both IPv6 addresses. 5008 */ 5009 static void 5010 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5011 struct in6_addr *srcmask) 5012 { 5013 struct ifnet *ifp = &sp->pp_if; 5014 struct ifaddr *ifa; 5015 struct sockaddr_in6 *si, *sm; 5016 struct in6_addr ssrc, ddst; 5017 5018 sm = NULL; 5019 memset(&ssrc, 0, sizeof(ssrc)); 5020 memset(&ddst, 0, sizeof(ddst)); 5021 /* 5022 * Pick the first link-local AF_INET6 address from the list, 5023 * aliases don't make any sense on a p2p link anyway. 5024 */ 5025 si = 0; 5026 IFADDR_READER_FOREACH(ifa, ifp) 5027 if (ifa->ifa_addr->sa_family == AF_INET6) { 5028 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5029 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5030 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5031 break; 5032 } 5033 if (ifa) { 5034 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5035 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5036 if (srcmask) { 5037 memcpy(srcmask, &sm->sin6_addr, 5038 sizeof(*srcmask)); 5039 } 5040 } 5041 5042 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5043 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5044 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5045 } 5046 5047 if (dst) 5048 memcpy(dst, &ddst, sizeof(*dst)); 5049 if (src) 5050 memcpy(src, &ssrc, sizeof(*src)); 5051 } 5052 5053 #ifdef IPV6CP_MYIFID_DYN 5054 /* 5055 * Generate random ifid. 5056 */ 5057 static void 5058 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5059 { 5060 /* TBD */ 5061 } 5062 5063 /* 5064 * Set my IPv6 address. Must be called at splnet. 5065 */ 5066 static void 5067 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5068 { 5069 STDDCL; 5070 struct ifaddr *ifa; 5071 struct sockaddr_in6 *sin6; 5072 5073 /* 5074 * Pick the first link-local AF_INET6 address from the list, 5075 * aliases don't make any sense on a p2p link anyway. 5076 */ 5077 5078 sin6 = NULL; 5079 IFADDR_READER_FOREACH(ifa, ifp) 5080 { 5081 if (ifa->ifa_addr->sa_family == AF_INET6) 5082 { 5083 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5084 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5085 break; 5086 } 5087 } 5088 5089 if (ifa && sin6) 5090 { 5091 int error; 5092 struct sockaddr_in6 new_sin6 = *sin6; 5093 5094 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5095 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5096 if (debug && error) 5097 { 5098 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5099 " failed, error=%d\n", ifp->if_xname, error); 5100 } 5101 if (!error) { 5102 (void)pfil_run_hooks(if_pfil, 5103 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5104 } 5105 } 5106 } 5107 #endif 5108 5109 /* 5110 * Suggest a candidate address to be used by peer. 5111 */ 5112 static void 5113 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5114 { 5115 struct in6_addr myaddr; 5116 struct timeval tv; 5117 5118 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5119 5120 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5121 microtime(&tv); 5122 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5123 myaddr.s6_addr[14] ^= 0xff; 5124 myaddr.s6_addr[15] ^= 0xff; 5125 } else { 5126 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5127 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5128 } 5129 if (suggest) 5130 memcpy(suggest, &myaddr, sizeof(myaddr)); 5131 } 5132 #endif /*INET6*/ 5133 5134 /* 5135 * Process ioctl requests specific to the PPP interface. 5136 * Permissions have already been checked. 5137 */ 5138 static int 5139 sppp_params(struct sppp *sp, u_long cmd, void *data) 5140 { 5141 switch (cmd) { 5142 case SPPPGETAUTHCFG: 5143 { 5144 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5145 int error; 5146 size_t len; 5147 5148 cfg->myauthflags = sp->myauth.flags; 5149 cfg->hisauthflags = sp->hisauth.flags; 5150 strlcpy(cfg->ifname, sp->pp_if.if_xname, sizeof(cfg->ifname)); 5151 cfg->hisauth = 0; 5152 if (sp->hisauth.proto) 5153 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5154 cfg->myauth = 0; 5155 if (sp->myauth.proto) 5156 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5157 if (cfg->myname_length == 0) { 5158 if (sp->myauth.name != NULL) 5159 cfg->myname_length = sp->myauth.name_len + 1; 5160 } else { 5161 if (sp->myauth.name == NULL) { 5162 cfg->myname_length = 0; 5163 } else { 5164 len = sp->myauth.name_len + 1; 5165 if (cfg->myname_length < len) 5166 return (ENAMETOOLONG); 5167 error = copyout(sp->myauth.name, cfg->myname, len); 5168 if (error) return error; 5169 } 5170 } 5171 if (cfg->hisname_length == 0) { 5172 if (sp->hisauth.name != NULL) 5173 cfg->hisname_length = sp->hisauth.name_len + 1; 5174 } else { 5175 if (sp->hisauth.name == NULL) { 5176 cfg->hisname_length = 0; 5177 } else { 5178 len = sp->hisauth.name_len + 1; 5179 if (cfg->hisname_length < len) 5180 return (ENAMETOOLONG); 5181 error = copyout(sp->hisauth.name, cfg->hisname, len); 5182 if (error) return error; 5183 } 5184 } 5185 } 5186 break; 5187 case SPPPSETAUTHCFG: 5188 { 5189 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5190 int error; 5191 5192 if (sp->myauth.name) { 5193 free(sp->myauth.name, M_DEVBUF); 5194 sp->myauth.name = NULL; 5195 } 5196 if (sp->myauth.secret) { 5197 free(sp->myauth.secret, M_DEVBUF); 5198 sp->myauth.secret = NULL; 5199 } 5200 if (sp->hisauth.name) { 5201 free(sp->hisauth.name, M_DEVBUF); 5202 sp->hisauth.name = NULL; 5203 } 5204 if (sp->hisauth.secret) { 5205 free(sp->hisauth.secret, M_DEVBUF); 5206 sp->hisauth.secret = NULL; 5207 } 5208 5209 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5210 if (cfg->hisname_length >= MCLBYTES) 5211 return (ENAMETOOLONG); 5212 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5213 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5214 if (error) { 5215 free(sp->hisauth.name, M_DEVBUF); 5216 sp->hisauth.name = NULL; 5217 return error; 5218 } 5219 sp->hisauth.name_len = cfg->hisname_length - 1; 5220 sp->hisauth.name[sp->hisauth.name_len] = 0; 5221 } 5222 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5223 if (cfg->hissecret_length >= MCLBYTES) 5224 return (ENAMETOOLONG); 5225 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5226 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5227 if (error) { 5228 free(sp->hisauth.secret, M_DEVBUF); 5229 sp->hisauth.secret = NULL; 5230 return error; 5231 } 5232 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5233 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5234 } 5235 if (cfg->myname != NULL && cfg->myname_length > 0) { 5236 if (cfg->myname_length >= MCLBYTES) 5237 return (ENAMETOOLONG); 5238 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5239 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5240 if (error) { 5241 free(sp->myauth.name, M_DEVBUF); 5242 sp->myauth.name = NULL; 5243 return error; 5244 } 5245 sp->myauth.name_len = cfg->myname_length - 1; 5246 sp->myauth.name[sp->myauth.name_len] = 0; 5247 } 5248 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5249 if (cfg->mysecret_length >= MCLBYTES) 5250 return (ENAMETOOLONG); 5251 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5252 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5253 if (error) { 5254 free(sp->myauth.secret, M_DEVBUF); 5255 sp->myauth.secret = NULL; 5256 return error; 5257 } 5258 sp->myauth.secret_len = cfg->mysecret_length - 1; 5259 sp->myauth.secret[sp->myauth.secret_len] = 0; 5260 } 5261 sp->myauth.flags = cfg->myauthflags; 5262 if (cfg->myauth) 5263 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5264 sp->hisauth.flags = cfg->hisauthflags; 5265 if (cfg->hisauth) 5266 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5267 sp->pp_auth_failures = 0; 5268 if (sp->hisauth.proto != 0) 5269 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5270 else 5271 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5272 } 5273 break; 5274 case SPPPGETLCPCFG: 5275 { 5276 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5277 lcpp->lcp_timeout = sp->lcp.timeout; 5278 } 5279 break; 5280 case SPPPSETLCPCFG: 5281 { 5282 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5283 sp->lcp.timeout = lcpp->lcp_timeout; 5284 } 5285 break; 5286 case SPPPGETSTATUS: 5287 { 5288 struct spppstatus *status = (struct spppstatus *)data; 5289 status->phase = sp->pp_phase; 5290 } 5291 break; 5292 case SPPPGETSTATUSNCP: 5293 { 5294 struct spppstatusncp *status = (struct spppstatusncp *)data; 5295 status->phase = sp->pp_phase; 5296 status->ncpup = sppp_ncp_check(sp); 5297 } 5298 break; 5299 case SPPPGETIDLETO: 5300 { 5301 struct spppidletimeout *to = (struct spppidletimeout *)data; 5302 to->idle_seconds = sp->pp_idle_timeout; 5303 } 5304 break; 5305 case SPPPSETIDLETO: 5306 { 5307 struct spppidletimeout *to = (struct spppidletimeout *)data; 5308 sp->pp_idle_timeout = to->idle_seconds; 5309 } 5310 break; 5311 case SPPPSETAUTHFAILURE: 5312 { 5313 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5314 sp->pp_max_auth_fail = afsettings->max_failures; 5315 sp->pp_auth_failures = 0; 5316 } 5317 break; 5318 case SPPPGETAUTHFAILURES: 5319 { 5320 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5321 stats->auth_failures = sp->pp_auth_failures; 5322 stats->max_failures = sp->pp_max_auth_fail; 5323 } 5324 break; 5325 case SPPPSETDNSOPTS: 5326 { 5327 struct spppdnssettings *req = (struct spppdnssettings *)data; 5328 sp->query_dns = req->query_dns & 3; 5329 } 5330 break; 5331 case SPPPGETDNSOPTS: 5332 { 5333 struct spppdnssettings *req = (struct spppdnssettings *)data; 5334 req->query_dns = sp->query_dns; 5335 } 5336 break; 5337 case SPPPGETDNSADDRS: 5338 { 5339 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5340 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5341 } 5342 break; 5343 case SPPPGETKEEPALIVE: 5344 { 5345 struct spppkeepalivesettings *settings = 5346 (struct spppkeepalivesettings*)data; 5347 settings->maxalive = sp->pp_maxalive; 5348 settings->max_noreceive = sp->pp_max_noreceive; 5349 } 5350 break; 5351 case SPPPSETKEEPALIVE: 5352 { 5353 struct spppkeepalivesettings *settings = 5354 (struct spppkeepalivesettings*)data; 5355 sp->pp_maxalive = settings->maxalive; 5356 sp->pp_max_noreceive = settings->max_noreceive; 5357 } 5358 break; 5359 #if defined(COMPAT_50) || defined(MODULAR) 5360 case __SPPPGETIDLETO50: 5361 { 5362 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5363 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5364 } 5365 break; 5366 case __SPPPSETIDLETO50: 5367 { 5368 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5369 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5370 } 5371 break; 5372 case __SPPPGETKEEPALIVE50: 5373 { 5374 struct spppkeepalivesettings50 *settings = 5375 (struct spppkeepalivesettings50*)data; 5376 settings->maxalive = sp->pp_maxalive; 5377 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5378 } 5379 break; 5380 case __SPPPSETKEEPALIVE50: 5381 { 5382 struct spppkeepalivesettings50 *settings = 5383 (struct spppkeepalivesettings50*)data; 5384 sp->pp_maxalive = settings->maxalive; 5385 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5386 } 5387 break; 5388 #endif /* COMPAT_50 || MODULAR */ 5389 default: 5390 return (EINVAL); 5391 } 5392 5393 return (0); 5394 } 5395 5396 static void 5397 sppp_phase_network(struct sppp *sp) 5398 { 5399 int i; 5400 uint32_t mask; 5401 5402 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 5403 5404 /* Notify NCPs now. */ 5405 for (i = 0; i < IDX_COUNT; i++) 5406 if ((cps[i])->flags & CP_NCP) 5407 (cps[i])->Open(sp); 5408 5409 /* Send Up events to all NCPs. */ 5410 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5411 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5412 (cps[i])->Up(sp); 5413 5414 /* if no NCP is starting, all this was in vain, close down */ 5415 sppp_lcp_check_and_close(sp); 5416 } 5417 5418 5419 static const char * 5420 sppp_cp_type_name(u_char type) 5421 { 5422 static char buf[12]; 5423 switch (type) { 5424 case CONF_REQ: return "conf-req"; 5425 case CONF_ACK: return "conf-ack"; 5426 case CONF_NAK: return "conf-nak"; 5427 case CONF_REJ: return "conf-rej"; 5428 case TERM_REQ: return "term-req"; 5429 case TERM_ACK: return "term-ack"; 5430 case CODE_REJ: return "code-rej"; 5431 case PROTO_REJ: return "proto-rej"; 5432 case ECHO_REQ: return "echo-req"; 5433 case ECHO_REPLY: return "echo-reply"; 5434 case DISC_REQ: return "discard-req"; 5435 } 5436 snprintf(buf, sizeof(buf), "0x%x", type); 5437 return buf; 5438 } 5439 5440 static const char * 5441 sppp_auth_type_name(u_short proto, u_char type) 5442 { 5443 static char buf[32]; 5444 const char *name; 5445 5446 switch (proto) { 5447 case PPP_CHAP: 5448 switch (type) { 5449 case CHAP_CHALLENGE: return "challenge"; 5450 case CHAP_RESPONSE: return "response"; 5451 case CHAP_SUCCESS: return "success"; 5452 case CHAP_FAILURE: return "failure"; 5453 default: name = "chap"; break; 5454 } 5455 break; 5456 5457 case PPP_PAP: 5458 switch (type) { 5459 case PAP_REQ: return "req"; 5460 case PAP_ACK: return "ack"; 5461 case PAP_NAK: return "nak"; 5462 default: name = "pap"; break; 5463 } 5464 break; 5465 5466 default: 5467 name = "bad"; 5468 break; 5469 } 5470 5471 snprintf(buf, sizeof(buf), "%s(%#x) %#x", name, proto, type); 5472 return buf; 5473 } 5474 5475 static const char * 5476 sppp_lcp_opt_name(u_char opt) 5477 { 5478 static char buf[12]; 5479 switch (opt) { 5480 case LCP_OPT_MRU: return "mru"; 5481 case LCP_OPT_ASYNC_MAP: return "async-map"; 5482 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5483 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5484 case LCP_OPT_MAGIC: return "magic"; 5485 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5486 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5487 } 5488 snprintf(buf, sizeof(buf), "0x%x", opt); 5489 return buf; 5490 } 5491 5492 static const char * 5493 sppp_ipcp_opt_name(u_char opt) 5494 { 5495 static char buf[12]; 5496 switch (opt) { 5497 case IPCP_OPT_ADDRESSES: return "addresses"; 5498 case IPCP_OPT_COMPRESSION: return "compression"; 5499 case IPCP_OPT_ADDRESS: return "address"; 5500 } 5501 snprintf(buf, sizeof(buf), "0x%x", opt); 5502 return buf; 5503 } 5504 5505 #ifdef INET6 5506 static const char * 5507 sppp_ipv6cp_opt_name(u_char opt) 5508 { 5509 static char buf[12]; 5510 switch (opt) { 5511 case IPV6CP_OPT_IFID: return "ifid"; 5512 case IPV6CP_OPT_COMPRESSION: return "compression"; 5513 } 5514 snprintf(buf, sizeof(buf), "0x%x", opt); 5515 return buf; 5516 } 5517 #endif 5518 5519 static const char * 5520 sppp_state_name(int state) 5521 { 5522 switch (state) { 5523 case STATE_INITIAL: return "initial"; 5524 case STATE_STARTING: return "starting"; 5525 case STATE_CLOSED: return "closed"; 5526 case STATE_STOPPED: return "stopped"; 5527 case STATE_CLOSING: return "closing"; 5528 case STATE_STOPPING: return "stopping"; 5529 case STATE_REQ_SENT: return "req-sent"; 5530 case STATE_ACK_RCVD: return "ack-rcvd"; 5531 case STATE_ACK_SENT: return "ack-sent"; 5532 case STATE_OPENED: return "opened"; 5533 } 5534 return "illegal"; 5535 } 5536 5537 static const char * 5538 sppp_phase_name(int phase) 5539 { 5540 switch (phase) { 5541 case SPPP_PHASE_DEAD: return "dead"; 5542 case SPPP_PHASE_ESTABLISH: return "establish"; 5543 case SPPP_PHASE_TERMINATE: return "terminate"; 5544 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5545 case SPPP_PHASE_NETWORK: return "network"; 5546 } 5547 return "illegal"; 5548 } 5549 5550 static const char * 5551 sppp_proto_name(u_short proto) 5552 { 5553 static char buf[12]; 5554 switch (proto) { 5555 case PPP_LCP: return "lcp"; 5556 case PPP_IPCP: return "ipcp"; 5557 case PPP_PAP: return "pap"; 5558 case PPP_CHAP: return "chap"; 5559 case PPP_IPV6CP: return "ipv6cp"; 5560 } 5561 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5562 return buf; 5563 } 5564 5565 static void 5566 sppp_print_bytes(const u_char *p, u_short len) 5567 { 5568 addlog(" %02x", *p++); 5569 while (--len > 0) 5570 addlog("-%02x", *p++); 5571 } 5572 5573 static void 5574 sppp_print_string(const char *p, u_short len) 5575 { 5576 u_char c; 5577 5578 while (len-- > 0) { 5579 c = *p++; 5580 /* 5581 * Print only ASCII chars directly. RFC 1994 recommends 5582 * using only them, but we don't rely on it. */ 5583 if (c < ' ' || c > '~') 5584 addlog("\\x%x", c); 5585 else 5586 addlog("%c", c); 5587 } 5588 } 5589 5590 static const char * 5591 sppp_dotted_quad(uint32_t addr) 5592 { 5593 static char s[16]; 5594 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5595 (int)((addr >> 24) & 0xff), 5596 (int)((addr >> 16) & 0xff), 5597 (int)((addr >> 8) & 0xff), 5598 (int)(addr & 0xff)); 5599 return s; 5600 } 5601 5602 /* a dummy, used to drop uninteresting events */ 5603 static void 5604 sppp_null(struct sppp *unused) 5605 { 5606 /* do just nothing */ 5607 } 5608 /* 5609 * This file is large. Tell emacs to highlight it nevertheless. 5610 * 5611 * Local Variables: 5612 * hilit-auto-highlight-maxout: 120000 5613 * End: 5614 */ 5615 5616 /* 5617 * Module glue 5618 */ 5619 MODULE(MODULE_CLASS_MISC, sppp_subr, NULL); 5620 5621 static int 5622 sppp_subr_modcmd(modcmd_t cmd, void *arg) 5623 { 5624 switch (cmd) { 5625 case MODULE_CMD_INIT: 5626 case MODULE_CMD_FINI: 5627 return 0; 5628 case MODULE_CMD_STAT: 5629 case MODULE_CMD_AUTOUNLOAD: 5630 default: 5631 return ENOTTY; 5632 } 5633 } 5634 5635
Indexes created Sat Sep 27 14:09:57 GMT 2025