if_spppsubr.c revision 1.157
1 /* $NetBSD: if_spppsubr.c,v 1.157 2016/11/18 10:38:55 knakahara 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 1.157 2016/11/18 10:38:55 knakahara Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_modular.h" 49 #include "opt_compat_netbsd.h" 50 #include "opt_net_mpsafe.h" 51 #endif 52 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 #include <sys/module.h> 69 70 #include <net/if.h> 71 #include <net/netisr.h> 72 #include <net/if_types.h> 73 #include <net/route.h> 74 #include <net/ppp_defs.h> 75 76 #include <netinet/in.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/in_var.h> 79 #ifdef INET 80 #include <netinet/ip.h> 81 #include <netinet/tcp.h> 82 #endif 83 #include <net/ethertypes.h> 84 85 #ifdef INET6 86 #include <netinet6/scope6_var.h> 87 #endif 88 89 #include <net/if_sppp.h> 90 #include <net/if_spppvar.h> 91 92 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 93 #define LOOPALIVECNT 3 /* loopback detection tries */ 94 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 95 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 96 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 97 98 /* 99 * Interface flags that can be set in an ifconfig command. 100 * 101 * Setting link0 will make the link passive, i.e. it will be marked 102 * as being administrative openable, but won't be opened to begin 103 * with. Incoming calls will be answered, or subsequent calls with 104 * -link1 will cause the administrative open of the LCP layer. 105 * 106 * Setting link1 will cause the link to auto-dial only as packets 107 * arrive to be sent. 108 * 109 * Setting IFF_DEBUG will syslog the option negotiation and state 110 * transitions at level kern.debug. Note: all logs consistently look 111 * like 112 * 113 * <if-name><unit>: <proto-name> <additional info...> 114 * 115 * with <if-name><unit> being something like "bppp0", and <proto-name> 116 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 117 */ 118 119 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 120 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 121 122 #define CONF_REQ 1 /* PPP configure request */ 123 #define CONF_ACK 2 /* PPP configure acknowledge */ 124 #define CONF_NAK 3 /* PPP configure negative ack */ 125 #define CONF_REJ 4 /* PPP configure reject */ 126 #define TERM_REQ 5 /* PPP terminate request */ 127 #define TERM_ACK 6 /* PPP terminate acknowledge */ 128 #define CODE_REJ 7 /* PPP code reject */ 129 #define PROTO_REJ 8 /* PPP protocol reject */ 130 #define ECHO_REQ 9 /* PPP echo request */ 131 #define ECHO_REPLY 10 /* PPP echo reply */ 132 #define DISC_REQ 11 /* PPP discard request */ 133 134 #define LCP_OPT_MRU 1 /* maximum receive unit */ 135 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 136 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 137 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 138 #define LCP_OPT_MAGIC 5 /* magic number */ 139 #define LCP_OPT_RESERVED 6 /* reserved */ 140 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 141 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 142 143 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 144 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 145 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 146 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 147 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 148 149 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 150 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 151 152 #define PAP_REQ 1 /* PAP name/password request */ 153 #define PAP_ACK 2 /* PAP acknowledge */ 154 #define PAP_NAK 3 /* PAP fail */ 155 156 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 157 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 158 #define CHAP_SUCCESS 3 /* CHAP response ok */ 159 #define CHAP_FAILURE 4 /* CHAP response failed */ 160 161 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 162 163 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 164 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 165 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 166 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 167 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 168 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 169 170 /* states are named and numbered according to RFC 1661 */ 171 #define STATE_INITIAL 0 172 #define STATE_STARTING 1 173 #define STATE_CLOSED 2 174 #define STATE_STOPPED 3 175 #define STATE_CLOSING 4 176 #define STATE_STOPPING 5 177 #define STATE_REQ_SENT 6 178 #define STATE_ACK_RCVD 7 179 #define STATE_ACK_SENT 8 180 #define STATE_OPENED 9 181 182 struct ppp_header { 183 uint8_t address; 184 uint8_t control; 185 uint16_t protocol; 186 } __packed; 187 #define PPP_HEADER_LEN sizeof (struct ppp_header) 188 189 struct lcp_header { 190 uint8_t type; 191 uint8_t ident; 192 uint16_t len; 193 } __packed; 194 #define LCP_HEADER_LEN sizeof (struct lcp_header) 195 196 struct cisco_packet { 197 uint32_t type; 198 uint32_t par1; 199 uint32_t par2; 200 uint16_t rel; 201 uint16_t time0; 202 uint16_t time1; 203 } __packed; 204 #define CISCO_PACKET_LEN 18 205 206 /* 207 * We follow the spelling and capitalization of RFC 1661 here, to make 208 * it easier comparing with the standard. Please refer to this RFC in 209 * case you can't make sense out of these abbreviation; it will also 210 * explain the semantics related to the various events and actions. 211 */ 212 struct cp { 213 u_short proto; /* PPP control protocol number */ 214 u_char protoidx; /* index into state table in struct sppp */ 215 u_char flags; 216 #define CP_LCP 0x01 /* this is the LCP */ 217 #define CP_AUTH 0x02 /* this is an authentication protocol */ 218 #define CP_NCP 0x04 /* this is a NCP */ 219 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 220 const char *name; /* name of this control protocol */ 221 /* event handlers */ 222 void (*Up)(struct sppp *sp); 223 void (*Down)(struct sppp *sp); 224 void (*Open)(struct sppp *sp); 225 void (*Close)(struct sppp *sp); 226 void (*TO)(void *sp); 227 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 228 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 229 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 230 /* actions */ 231 void (*tlu)(struct sppp *sp); 232 void (*tld)(struct sppp *sp); 233 void (*tls)(struct sppp *sp); 234 void (*tlf)(struct sppp *sp); 235 void (*scr)(struct sppp *sp); 236 }; 237 238 static struct sppp *spppq; 239 static callout_t keepalive_ch; 240 241 #ifdef INET 242 /* 243 * The following disgusting hack gets around the problem that IP TOS 244 * can't be set yet. We want to put "interactive" traffic on a high 245 * priority queue. To decide if traffic is interactive, we check that 246 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 247 * 248 * XXX is this really still necessary? - joerg - 249 */ 250 static u_short interactive_ports[8] = { 251 0, 513, 0, 0, 252 0, 21, 0, 23, 253 }; 254 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 255 #endif 256 257 /* almost every function needs these */ 258 #define STDDCL \ 259 struct ifnet *ifp = &sp->pp_if; \ 260 int debug = ifp->if_flags & IFF_DEBUG 261 262 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 263 const struct sockaddr *dst, const struct rtentry *rt); 264 265 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 266 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 267 268 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 269 struct mbuf *m); 270 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 271 u_char ident, u_short len, void *data); 272 /* static void sppp_cp_timeout(void *arg); */ 273 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 274 int newstate); 275 static void sppp_auth_send(const struct cp *cp, 276 struct sppp *sp, unsigned int type, unsigned int id, 277 ...); 278 279 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 280 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 281 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 282 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 283 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 284 285 static void sppp_null(struct sppp *sp); 286 287 static void sppp_lcp_init(struct sppp *sp); 288 static void sppp_lcp_up(struct sppp *sp); 289 static void sppp_lcp_down(struct sppp *sp); 290 static void sppp_lcp_open(struct sppp *sp); 291 static void sppp_lcp_close(struct sppp *sp); 292 static void sppp_lcp_TO(void *sp); 293 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 294 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 295 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 296 static void sppp_lcp_tlu(struct sppp *sp); 297 static void sppp_lcp_tld(struct sppp *sp); 298 static void sppp_lcp_tls(struct sppp *sp); 299 static void sppp_lcp_tlf(struct sppp *sp); 300 static void sppp_lcp_scr(struct sppp *sp); 301 static void sppp_lcp_check_and_close(struct sppp *sp); 302 static int sppp_ncp_check(struct sppp *sp); 303 304 static void sppp_ipcp_init(struct sppp *sp); 305 static void sppp_ipcp_up(struct sppp *sp); 306 static void sppp_ipcp_down(struct sppp *sp); 307 static void sppp_ipcp_open(struct sppp *sp); 308 static void sppp_ipcp_close(struct sppp *sp); 309 static void sppp_ipcp_TO(void *sp); 310 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 312 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 313 static void sppp_ipcp_tlu(struct sppp *sp); 314 static void sppp_ipcp_tld(struct sppp *sp); 315 static void sppp_ipcp_tls(struct sppp *sp); 316 static void sppp_ipcp_tlf(struct sppp *sp); 317 static void sppp_ipcp_scr(struct sppp *sp); 318 319 static void sppp_ipv6cp_init(struct sppp *sp); 320 static void sppp_ipv6cp_up(struct sppp *sp); 321 static void sppp_ipv6cp_down(struct sppp *sp); 322 static void sppp_ipv6cp_open(struct sppp *sp); 323 static void sppp_ipv6cp_close(struct sppp *sp); 324 static void sppp_ipv6cp_TO(void *sp); 325 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 327 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 328 static void sppp_ipv6cp_tlu(struct sppp *sp); 329 static void sppp_ipv6cp_tld(struct sppp *sp); 330 static void sppp_ipv6cp_tls(struct sppp *sp); 331 static void sppp_ipv6cp_tlf(struct sppp *sp); 332 static void sppp_ipv6cp_scr(struct sppp *sp); 333 334 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 335 static void sppp_pap_init(struct sppp *sp); 336 static void sppp_pap_open(struct sppp *sp); 337 static void sppp_pap_close(struct sppp *sp); 338 static void sppp_pap_TO(void *sp); 339 static void sppp_pap_my_TO(void *sp); 340 static void sppp_pap_tlu(struct sppp *sp); 341 static void sppp_pap_tld(struct sppp *sp); 342 static void sppp_pap_scr(struct sppp *sp); 343 344 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_chap_init(struct sppp *sp); 346 static void sppp_chap_open(struct sppp *sp); 347 static void sppp_chap_close(struct sppp *sp); 348 static void sppp_chap_TO(void *sp); 349 static void sppp_chap_tlu(struct sppp *sp); 350 static void sppp_chap_tld(struct sppp *sp); 351 static void sppp_chap_scr(struct sppp *sp); 352 353 static const char *sppp_auth_type_name(u_short proto, u_char type); 354 static const char *sppp_cp_type_name(u_char type); 355 static const char *sppp_dotted_quad(uint32_t addr); 356 static const char *sppp_ipcp_opt_name(u_char opt); 357 #ifdef INET6 358 static const char *sppp_ipv6cp_opt_name(u_char opt); 359 #endif 360 static const char *sppp_lcp_opt_name(u_char opt); 361 static const char *sppp_phase_name(int phase); 362 static const char *sppp_proto_name(u_short proto); 363 static const char *sppp_state_name(int state); 364 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 365 #ifdef INET 366 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 367 uint32_t *srcmask); 368 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 369 static void sppp_clear_ip_addrs(struct sppp *sp); 370 #endif 371 static void sppp_keepalive(void *dummy); 372 static void sppp_phase_network(struct sppp *sp); 373 static void sppp_print_bytes(const u_char *p, u_short len); 374 static void sppp_print_string(const char *p, u_short len); 375 #ifdef INET6 376 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 377 struct in6_addr *dst, struct in6_addr *srcmask); 378 #ifdef IPV6CP_MYIFID_DYN 379 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 380 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 381 #endif 382 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 383 #endif 384 385 /* our control protocol descriptors */ 386 static const struct cp lcp = { 387 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 388 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 389 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 390 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 391 sppp_lcp_scr 392 }; 393 394 static const struct cp ipcp = { 395 PPP_IPCP, IDX_IPCP, 396 #ifdef INET 397 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 398 #else 399 0, 400 #endif 401 "ipcp", 402 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 403 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 404 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 405 sppp_ipcp_scr 406 }; 407 408 static const struct cp ipv6cp = { 409 PPP_IPV6CP, IDX_IPV6CP, 410 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 411 CP_NCP, 412 #else 413 0, 414 #endif 415 "ipv6cp", 416 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 417 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 418 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 419 sppp_ipv6cp_scr 420 }; 421 422 static const struct cp pap = { 423 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 424 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 425 sppp_pap_TO, 0, 0, 0, 426 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 427 sppp_pap_scr 428 }; 429 430 static const struct cp chap = { 431 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 432 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 433 sppp_chap_TO, 0, 0, 0, 434 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 435 sppp_chap_scr 436 }; 437 438 static const struct cp *cps[IDX_COUNT] = { 439 &lcp, /* IDX_LCP */ 440 &ipcp, /* IDX_IPCP */ 441 &ipv6cp, /* IDX_IPV6CP */ 442 &pap, /* IDX_PAP */ 443 &chap, /* IDX_CHAP */ 444 }; 445 446 static void 447 sppp_change_phase(struct sppp *sp, int phase) 448 { 449 STDDCL; 450 451 if (sp->pp_phase == phase) 452 return; 453 454 sp->pp_phase = phase; 455 456 if (phase == SPPP_PHASE_NETWORK) 457 if_link_state_change(ifp, LINK_STATE_UP); 458 else 459 if_link_state_change(ifp, LINK_STATE_DOWN); 460 461 if (debug) 462 { 463 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 464 sppp_phase_name(sp->pp_phase)); 465 } 466 } 467 468 /* 469 * Exported functions, comprising our interface to the lower layer. 470 */ 471 472 /* 473 * Process the received packet. 474 */ 475 void 476 sppp_input(struct ifnet *ifp, struct mbuf *m) 477 { 478 struct ppp_header *h = NULL; 479 pktqueue_t *pktq = NULL; 480 struct ifqueue *inq = NULL; 481 uint16_t protocol; 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 IFQ_LOCK(inq); 646 if (IF_QFULL(inq)) { 647 /* Queue overflow. */ 648 IF_DROP(inq); 649 IFQ_UNLOCK(inq); 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 IFQ_UNLOCK(inq); 657 schednetisr(isr); 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 /* Safety - shouldn't be needed as there is no media to set. */ 972 ifmedia_delete_instance(&sp->pp_im, IFM_INST_ANY); 973 } 974 975 /* 976 * Flush the interface output queue. 977 */ 978 void 979 sppp_flush(struct ifnet *ifp) 980 { 981 struct sppp *sp = (struct sppp *) ifp; 982 983 IFQ_PURGE(&sp->pp_if.if_snd); 984 IF_PURGE(&sp->pp_fastq); 985 IF_PURGE(&sp->pp_cpq); 986 } 987 988 /* 989 * Check if the output queue is empty. 990 */ 991 int 992 sppp_isempty(struct ifnet *ifp) 993 { 994 struct sppp *sp = (struct sppp *) ifp; 995 int empty, s; 996 997 s = splnet(); 998 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 999 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1000 splx(s); 1001 return (empty); 1002 } 1003 1004 /* 1005 * Get next packet to send. 1006 */ 1007 struct mbuf * 1008 sppp_dequeue(struct ifnet *ifp) 1009 { 1010 struct sppp *sp = (struct sppp *) ifp; 1011 struct mbuf *m; 1012 int s; 1013 1014 s = splnet(); 1015 /* 1016 * Process only the control protocol queue until we have at 1017 * least one NCP open. 1018 * 1019 * Do always serve all three queues in Cisco mode. 1020 */ 1021 IF_DEQUEUE(&sp->pp_cpq, m); 1022 if (m == NULL && 1023 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1024 IF_DEQUEUE(&sp->pp_fastq, m); 1025 if (m == NULL) 1026 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1027 } 1028 splx(s); 1029 return m; 1030 } 1031 1032 /* 1033 * Process an ioctl request. Called on low priority level. 1034 */ 1035 int 1036 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1037 { 1038 struct lwp *l = curlwp; /* XXX */ 1039 struct ifreq *ifr = (struct ifreq *) data; 1040 struct ifaddr *ifa = (struct ifaddr *) data; 1041 struct sppp *sp = (struct sppp *) ifp; 1042 int s, error=0, going_up, going_down, newmode; 1043 1044 s = splnet(); 1045 switch (cmd) { 1046 case SIOCINITIFADDR: 1047 ifa->ifa_rtrequest = p2p_rtrequest; 1048 break; 1049 1050 case SIOCSIFFLAGS: 1051 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1052 break; 1053 going_up = ifp->if_flags & IFF_UP && 1054 (ifp->if_flags & IFF_RUNNING) == 0; 1055 going_down = (ifp->if_flags & IFF_UP) == 0 && 1056 ifp->if_flags & IFF_RUNNING; 1057 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1058 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1059 /* sanity */ 1060 newmode = IFF_PASSIVE; 1061 ifp->if_flags &= ~IFF_AUTO; 1062 } 1063 1064 if (going_up || going_down) 1065 lcp.Close(sp); 1066 if (going_up && newmode == 0) { 1067 /* neither auto-dial nor passive */ 1068 ifp->if_flags |= IFF_RUNNING; 1069 if (!(sp->pp_flags & PP_CISCO)) 1070 lcp.Open(sp); 1071 } else if (going_down) { 1072 sppp_flush(ifp); 1073 ifp->if_flags &= ~IFF_RUNNING; 1074 } 1075 1076 break; 1077 1078 case SIOCSIFMTU: 1079 if (ifr->ifr_mtu < PPP_MINMRU || 1080 ifr->ifr_mtu > sp->lcp.their_mru) { 1081 error = EINVAL; 1082 break; 1083 } 1084 /*FALLTHROUGH*/ 1085 case SIOCGIFMTU: 1086 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1087 error = 0; 1088 break; 1089 case SIOCADDMULTI: 1090 case SIOCDELMULTI: 1091 break; 1092 1093 case SPPPSETAUTHCFG: 1094 case SPPPSETLCPCFG: 1095 case SPPPSETIDLETO: 1096 case SPPPSETAUTHFAILURE: 1097 case SPPPSETDNSOPTS: 1098 case SPPPSETKEEPALIVE: 1099 #if defined(COMPAT_50) || defined(MODULAR) 1100 case __SPPPSETIDLETO50: 1101 case __SPPPSETKEEPALIVE50: 1102 #endif /* COMPAT_50 || MODULAR */ 1103 error = kauth_authorize_network(l->l_cred, 1104 KAUTH_NETWORK_INTERFACE, 1105 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1106 NULL); 1107 if (error) 1108 break; 1109 error = sppp_params(sp, cmd, data); 1110 break; 1111 1112 case SPPPGETAUTHCFG: 1113 case SPPPGETLCPCFG: 1114 case SPPPGETAUTHFAILURES: 1115 error = kauth_authorize_network(l->l_cred, 1116 KAUTH_NETWORK_INTERFACE, 1117 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1118 NULL); 1119 if (error) 1120 break; 1121 error = sppp_params(sp, cmd, data); 1122 break; 1123 1124 case SPPPGETSTATUS: 1125 case SPPPGETSTATUSNCP: 1126 case SPPPGETIDLETO: 1127 case SPPPGETDNSOPTS: 1128 case SPPPGETDNSADDRS: 1129 case SPPPGETKEEPALIVE: 1130 #if defined(COMPAT_50) || defined(MODULAR) 1131 case __SPPPGETIDLETO50: 1132 case __SPPPGETKEEPALIVE50: 1133 #endif /* COMPAT_50 || MODULAR */ 1134 error = sppp_params(sp, cmd, data); 1135 break; 1136 1137 case SIOCGIFMEDIA: 1138 error = ifmedia_ioctl(ifp, ifr, &sp->pp_im, cmd); 1139 break; 1140 1141 default: 1142 error = ifioctl_common(ifp, cmd, data); 1143 break; 1144 } 1145 splx(s); 1146 return (error); 1147 } 1148 1149 1150 /* 1151 * Cisco framing implementation. 1152 */ 1153 1154 /* 1155 * Handle incoming Cisco keepalive protocol packets. 1156 */ 1157 static void 1158 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1159 { 1160 STDDCL; 1161 struct cisco_packet *h; 1162 #ifdef INET 1163 uint32_t me, mymask = 0; /* XXX: GCC */ 1164 #endif 1165 1166 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1167 if (debug) 1168 log(LOG_DEBUG, 1169 "%s: cisco invalid packet length: %d bytes\n", 1170 ifp->if_xname, m->m_pkthdr.len); 1171 return; 1172 } 1173 h = mtod(m, struct cisco_packet *); 1174 if (debug) 1175 log(LOG_DEBUG, 1176 "%s: cisco input: %d bytes " 1177 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1178 ifp->if_xname, m->m_pkthdr.len, 1179 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1180 (u_int)h->time0, (u_int)h->time1); 1181 switch (ntohl(h->type)) { 1182 default: 1183 if (debug) 1184 addlog("%s: cisco unknown packet type: 0x%x\n", 1185 ifp->if_xname, ntohl(h->type)); 1186 break; 1187 case CISCO_ADDR_REPLY: 1188 /* Reply on address request, ignore */ 1189 break; 1190 case CISCO_KEEPALIVE_REQ: 1191 sp->pp_alivecnt = 0; 1192 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1193 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1194 /* Local and remote sequence numbers are equal. 1195 * Probably, the line is in loopback mode. */ 1196 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1197 printf ("%s: loopback\n", 1198 ifp->if_xname); 1199 sp->pp_loopcnt = 0; 1200 if (ifp->if_flags & IFF_UP) { 1201 if_down(ifp); 1202 IF_PURGE(&sp->pp_cpq); 1203 } 1204 } 1205 ++sp->pp_loopcnt; 1206 1207 /* Generate new local sequence number */ 1208 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1209 break; 1210 } 1211 sp->pp_loopcnt = 0; 1212 if (! (ifp->if_flags & IFF_UP) && 1213 (ifp->if_flags & IFF_RUNNING)) { 1214 if_up(ifp); 1215 } 1216 break; 1217 case CISCO_ADDR_REQ: 1218 #ifdef INET 1219 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1220 if (me != 0L) 1221 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1222 #endif 1223 break; 1224 } 1225 } 1226 1227 /* 1228 * Send Cisco keepalive packet. 1229 */ 1230 static void 1231 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1232 { 1233 STDDCL; 1234 struct ppp_header *h; 1235 struct cisco_packet *ch; 1236 struct mbuf *m; 1237 uint32_t t; 1238 1239 t = time_uptime * 1000; 1240 MGETHDR(m, M_DONTWAIT, MT_DATA); 1241 if (! m) 1242 return; 1243 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1244 m_reset_rcvif(m); 1245 1246 h = mtod(m, struct ppp_header *); 1247 h->address = CISCO_MULTICAST; 1248 h->control = 0; 1249 h->protocol = htons(CISCO_KEEPALIVE); 1250 1251 ch = (struct cisco_packet *)(h + 1); 1252 ch->type = htonl(type); 1253 ch->par1 = htonl(par1); 1254 ch->par2 = htonl(par2); 1255 ch->rel = -1; 1256 1257 ch->time0 = htons((u_short)(t >> 16)); 1258 ch->time1 = htons((u_short) t); 1259 1260 if (debug) 1261 log(LOG_DEBUG, 1262 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1263 ifp->if_xname, ntohl(ch->type), ch->par1, 1264 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1265 (u_int)ch->time1); 1266 1267 if (IF_QFULL(&sp->pp_cpq)) { 1268 IF_DROP(&sp->pp_fastq); 1269 IF_DROP(&ifp->if_snd); 1270 m_freem(m); 1271 ++ifp->if_oerrors; 1272 return; 1273 } else 1274 IF_ENQUEUE(&sp->pp_cpq, m); 1275 if (! (ifp->if_flags & IFF_OACTIVE)) 1276 if_start_lock(ifp); 1277 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1278 } 1279 1280 /* 1281 * PPP protocol implementation. 1282 */ 1283 1284 /* 1285 * Send PPP control protocol packet. 1286 */ 1287 static void 1288 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1289 u_char ident, u_short len, void *data) 1290 { 1291 STDDCL; 1292 struct lcp_header *lh; 1293 struct mbuf *m; 1294 size_t pkthdrlen; 1295 1296 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1297 1298 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1299 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1300 MGETHDR(m, M_DONTWAIT, MT_DATA); 1301 if (! m) 1302 return; 1303 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1304 m_reset_rcvif(m); 1305 1306 if (sp->pp_flags & PP_NOFRAMING) { 1307 *mtod(m, uint16_t *) = htons(proto); 1308 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1309 } else { 1310 struct ppp_header *h; 1311 h = mtod(m, struct ppp_header *); 1312 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1313 h->control = PPP_UI; /* Unnumbered Info */ 1314 h->protocol = htons(proto); /* Link Control Protocol */ 1315 lh = (struct lcp_header *)(h + 1); 1316 } 1317 lh->type = type; 1318 lh->ident = ident; 1319 lh->len = htons(LCP_HEADER_LEN + len); 1320 if (len) 1321 memcpy(lh + 1, data, len); 1322 1323 if (debug) { 1324 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1325 ifp->if_xname, 1326 sppp_proto_name(proto), 1327 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1328 if (len) 1329 sppp_print_bytes((u_char *)(lh + 1), len); 1330 addlog(">\n"); 1331 } 1332 if (IF_QFULL(&sp->pp_cpq)) { 1333 IF_DROP(&sp->pp_fastq); 1334 IF_DROP(&ifp->if_snd); 1335 m_freem(m); 1336 ++ifp->if_oerrors; 1337 return; 1338 } else 1339 IF_ENQUEUE(&sp->pp_cpq, m); 1340 if (! (ifp->if_flags & IFF_OACTIVE)) 1341 if_start_lock(ifp); 1342 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1343 } 1344 1345 /* 1346 * Handle incoming PPP control protocol packets. 1347 */ 1348 static void 1349 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1350 { 1351 STDDCL; 1352 struct lcp_header *h; 1353 int printlen, len = m->m_pkthdr.len; 1354 int rv; 1355 u_char *p; 1356 uint32_t u32; 1357 1358 if (len < 4) { 1359 if (debug) 1360 log(LOG_DEBUG, 1361 "%s: %s invalid packet length: %d bytes\n", 1362 ifp->if_xname, cp->name, len); 1363 return; 1364 } 1365 h = mtod(m, struct lcp_header *); 1366 if (debug) { 1367 printlen = ntohs(h->len); 1368 log(LOG_DEBUG, 1369 "%s: %s input(%s): <%s id=0x%x len=%d", 1370 ifp->if_xname, cp->name, 1371 sppp_state_name(sp->state[cp->protoidx]), 1372 sppp_cp_type_name(h->type), h->ident, printlen); 1373 if (len < printlen) 1374 printlen = len; 1375 if (printlen > 4) 1376 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1377 addlog(">\n"); 1378 } 1379 if (len > ntohs(h->len)) 1380 len = ntohs(h->len); 1381 p = (u_char *)(h + 1); 1382 switch (h->type) { 1383 case CONF_REQ: 1384 if (len < 4) { 1385 if (debug) 1386 addlog("%s: %s invalid conf-req length %d\n", 1387 ifp->if_xname, cp->name, 1388 len); 1389 ++ifp->if_ierrors; 1390 break; 1391 } 1392 /* handle states where RCR doesn't get a SCA/SCN */ 1393 switch (sp->state[cp->protoidx]) { 1394 case STATE_CLOSING: 1395 case STATE_STOPPING: 1396 return; 1397 case STATE_CLOSED: 1398 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1399 0, 0); 1400 return; 1401 } 1402 rv = (cp->RCR)(sp, h, len); 1403 if (rv < 0) { 1404 /* fatal error, shut down */ 1405 (cp->tld)(sp); 1406 sppp_lcp_tlf(sp); 1407 return; 1408 } 1409 switch (sp->state[cp->protoidx]) { 1410 case STATE_OPENED: 1411 (cp->tld)(sp); 1412 (cp->scr)(sp); 1413 /* fall through... */ 1414 case STATE_ACK_SENT: 1415 case STATE_REQ_SENT: 1416 sppp_cp_change_state(cp, sp, rv? 1417 STATE_ACK_SENT: STATE_REQ_SENT); 1418 break; 1419 case STATE_STOPPED: 1420 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1421 (cp->scr)(sp); 1422 sppp_cp_change_state(cp, sp, rv? 1423 STATE_ACK_SENT: STATE_REQ_SENT); 1424 break; 1425 case STATE_ACK_RCVD: 1426 if (rv) { 1427 sppp_cp_change_state(cp, sp, STATE_OPENED); 1428 if (debug) 1429 log(LOG_DEBUG, "%s: %s tlu\n", 1430 ifp->if_xname, 1431 cp->name); 1432 (cp->tlu)(sp); 1433 } else 1434 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1435 break; 1436 default: 1437 printf("%s: %s illegal %s in state %s\n", 1438 ifp->if_xname, cp->name, 1439 sppp_cp_type_name(h->type), 1440 sppp_state_name(sp->state[cp->protoidx])); 1441 ++ifp->if_ierrors; 1442 } 1443 break; 1444 case CONF_ACK: 1445 if (h->ident != sp->confid[cp->protoidx]) { 1446 if (debug) 1447 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1448 ifp->if_xname, cp->name, 1449 h->ident, sp->confid[cp->protoidx]); 1450 ++ifp->if_ierrors; 1451 break; 1452 } 1453 switch (sp->state[cp->protoidx]) { 1454 case STATE_CLOSED: 1455 case STATE_STOPPED: 1456 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1457 break; 1458 case STATE_CLOSING: 1459 case STATE_STOPPING: 1460 break; 1461 case STATE_REQ_SENT: 1462 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1463 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1464 break; 1465 case STATE_OPENED: 1466 (cp->tld)(sp); 1467 /* fall through */ 1468 case STATE_ACK_RCVD: 1469 (cp->scr)(sp); 1470 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1471 break; 1472 case STATE_ACK_SENT: 1473 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1474 sppp_cp_change_state(cp, sp, STATE_OPENED); 1475 if (debug) 1476 log(LOG_DEBUG, "%s: %s tlu\n", 1477 ifp->if_xname, cp->name); 1478 (cp->tlu)(sp); 1479 break; 1480 default: 1481 printf("%s: %s illegal %s in state %s\n", 1482 ifp->if_xname, cp->name, 1483 sppp_cp_type_name(h->type), 1484 sppp_state_name(sp->state[cp->protoidx])); 1485 ++ifp->if_ierrors; 1486 } 1487 break; 1488 case CONF_NAK: 1489 case CONF_REJ: 1490 if (h->ident != sp->confid[cp->protoidx]) { 1491 if (debug) 1492 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1493 ifp->if_xname, cp->name, 1494 h->ident, sp->confid[cp->protoidx]); 1495 ++ifp->if_ierrors; 1496 break; 1497 } 1498 if (h->type == CONF_NAK) 1499 (cp->RCN_nak)(sp, h, len); 1500 else /* CONF_REJ */ 1501 (cp->RCN_rej)(sp, h, len); 1502 1503 switch (sp->state[cp->protoidx]) { 1504 case STATE_CLOSED: 1505 case STATE_STOPPED: 1506 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1507 break; 1508 case STATE_REQ_SENT: 1509 case STATE_ACK_SENT: 1510 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1511 (cp->scr)(sp); 1512 break; 1513 case STATE_OPENED: 1514 (cp->tld)(sp); 1515 /* fall through */ 1516 case STATE_ACK_RCVD: 1517 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1518 (cp->scr)(sp); 1519 break; 1520 case STATE_CLOSING: 1521 case STATE_STOPPING: 1522 break; 1523 default: 1524 printf("%s: %s illegal %s in state %s\n", 1525 ifp->if_xname, cp->name, 1526 sppp_cp_type_name(h->type), 1527 sppp_state_name(sp->state[cp->protoidx])); 1528 ++ifp->if_ierrors; 1529 } 1530 break; 1531 1532 case TERM_REQ: 1533 switch (sp->state[cp->protoidx]) { 1534 case STATE_ACK_RCVD: 1535 case STATE_ACK_SENT: 1536 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1537 /* fall through */ 1538 case STATE_CLOSED: 1539 case STATE_STOPPED: 1540 case STATE_CLOSING: 1541 case STATE_STOPPING: 1542 case STATE_REQ_SENT: 1543 sta: 1544 /* Send Terminate-Ack packet. */ 1545 if (debug) 1546 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1547 ifp->if_xname, cp->name); 1548 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1549 break; 1550 case STATE_OPENED: 1551 (cp->tld)(sp); 1552 sp->rst_counter[cp->protoidx] = 0; 1553 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1554 goto sta; 1555 default: 1556 printf("%s: %s illegal %s in state %s\n", 1557 ifp->if_xname, cp->name, 1558 sppp_cp_type_name(h->type), 1559 sppp_state_name(sp->state[cp->protoidx])); 1560 ++ifp->if_ierrors; 1561 } 1562 break; 1563 case TERM_ACK: 1564 switch (sp->state[cp->protoidx]) { 1565 case STATE_CLOSED: 1566 case STATE_STOPPED: 1567 case STATE_REQ_SENT: 1568 case STATE_ACK_SENT: 1569 break; 1570 case STATE_CLOSING: 1571 (cp->tlf)(sp); 1572 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1573 sppp_lcp_check_and_close(sp); 1574 break; 1575 case STATE_STOPPING: 1576 (cp->tlf)(sp); 1577 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1578 sppp_lcp_check_and_close(sp); 1579 break; 1580 case STATE_ACK_RCVD: 1581 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1582 break; 1583 case STATE_OPENED: 1584 (cp->tld)(sp); 1585 (cp->scr)(sp); 1586 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1587 break; 1588 default: 1589 printf("%s: %s illegal %s in state %s\n", 1590 ifp->if_xname, cp->name, 1591 sppp_cp_type_name(h->type), 1592 sppp_state_name(sp->state[cp->protoidx])); 1593 ++ifp->if_ierrors; 1594 } 1595 break; 1596 case CODE_REJ: 1597 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1598 log(LOG_INFO, 1599 "%s: %s: ignoring RXJ (%s) for code ?, " 1600 "danger will robinson\n", 1601 ifp->if_xname, cp->name, 1602 sppp_cp_type_name(h->type)); 1603 switch (sp->state[cp->protoidx]) { 1604 case STATE_CLOSED: 1605 case STATE_STOPPED: 1606 case STATE_REQ_SENT: 1607 case STATE_ACK_SENT: 1608 case STATE_CLOSING: 1609 case STATE_STOPPING: 1610 case STATE_OPENED: 1611 break; 1612 case STATE_ACK_RCVD: 1613 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1614 break; 1615 default: 1616 printf("%s: %s illegal %s in state %s\n", 1617 ifp->if_xname, cp->name, 1618 sppp_cp_type_name(h->type), 1619 sppp_state_name(sp->state[cp->protoidx])); 1620 ++ifp->if_ierrors; 1621 } 1622 break; 1623 case PROTO_REJ: 1624 { 1625 int catastrophic; 1626 const struct cp *upper; 1627 int i; 1628 uint16_t proto; 1629 1630 catastrophic = 0; 1631 upper = NULL; 1632 proto = p[0] << 8 | p[1]; 1633 for (i = 0; i < IDX_COUNT; i++) { 1634 if (cps[i]->proto == proto) { 1635 upper = cps[i]; 1636 break; 1637 } 1638 } 1639 if (upper == NULL) 1640 catastrophic++; 1641 1642 if (debug) 1643 log(LOG_INFO, 1644 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1645 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1646 sppp_cp_type_name(h->type), proto, 1647 upper ? upper->name : "unknown", 1648 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1649 1650 /* 1651 * if we got RXJ+ against conf-req, the peer does not implement 1652 * this particular protocol type. terminate the protocol. 1653 */ 1654 if (upper && !catastrophic) { 1655 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1656 upper->Close(sp); 1657 break; 1658 } 1659 } 1660 1661 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1662 switch (sp->state[cp->protoidx]) { 1663 case STATE_CLOSED: 1664 case STATE_STOPPED: 1665 case STATE_REQ_SENT: 1666 case STATE_ACK_SENT: 1667 case STATE_CLOSING: 1668 case STATE_STOPPING: 1669 case STATE_OPENED: 1670 break; 1671 case STATE_ACK_RCVD: 1672 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1673 break; 1674 default: 1675 printf("%s: %s illegal %s in state %s\n", 1676 ifp->if_xname, cp->name, 1677 sppp_cp_type_name(h->type), 1678 sppp_state_name(sp->state[cp->protoidx])); 1679 ++ifp->if_ierrors; 1680 } 1681 break; 1682 } 1683 case DISC_REQ: 1684 if (cp->proto != PPP_LCP) 1685 goto illegal; 1686 /* Discard the packet. */ 1687 break; 1688 case ECHO_REQ: 1689 if (cp->proto != PPP_LCP) 1690 goto illegal; 1691 if (sp->state[cp->protoidx] != STATE_OPENED) { 1692 if (debug) 1693 addlog("%s: lcp echo req but lcp closed\n", 1694 ifp->if_xname); 1695 ++ifp->if_ierrors; 1696 break; 1697 } 1698 if (len < 8) { 1699 if (debug) 1700 addlog("%s: invalid lcp echo request " 1701 "packet length: %d bytes\n", 1702 ifp->if_xname, len); 1703 break; 1704 } 1705 memcpy(&u32, h + 1, sizeof u32); 1706 if (ntohl(u32) == sp->lcp.magic) { 1707 /* Line loopback mode detected. */ 1708 printf("%s: loopback\n", ifp->if_xname); 1709 if_down(ifp); 1710 IF_PURGE(&sp->pp_cpq); 1711 1712 /* Shut down the PPP link. */ 1713 /* XXX */ 1714 lcp.Down(sp); 1715 lcp.Up(sp); 1716 break; 1717 } 1718 u32 = htonl(sp->lcp.magic); 1719 memcpy(h + 1, &u32, sizeof u32); 1720 if (debug) 1721 addlog("%s: got lcp echo req, sending echo rep\n", 1722 ifp->if_xname); 1723 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1724 h + 1); 1725 break; 1726 case ECHO_REPLY: 1727 if (cp->proto != PPP_LCP) 1728 goto illegal; 1729 if (h->ident != sp->lcp.echoid) { 1730 ++ifp->if_ierrors; 1731 break; 1732 } 1733 if (len < 8) { 1734 if (debug) 1735 addlog("%s: lcp invalid echo reply " 1736 "packet length: %d bytes\n", 1737 ifp->if_xname, len); 1738 break; 1739 } 1740 if (debug) 1741 addlog("%s: lcp got echo rep\n", 1742 ifp->if_xname); 1743 memcpy(&u32, h + 1, sizeof u32); 1744 if (ntohl(u32) != sp->lcp.magic) 1745 sp->pp_alivecnt = 0; 1746 break; 1747 default: 1748 /* Unknown packet type -- send Code-Reject packet. */ 1749 illegal: 1750 if (debug) 1751 addlog("%s: %s send code-rej for 0x%x\n", 1752 ifp->if_xname, cp->name, h->type); 1753 sppp_cp_send(sp, cp->proto, CODE_REJ, 1754 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1755 ++ifp->if_ierrors; 1756 } 1757 } 1758 1759 1760 /* 1761 * The generic part of all Up/Down/Open/Close/TO event handlers. 1762 * Basically, the state transition handling in the automaton. 1763 */ 1764 static void 1765 sppp_up_event(const struct cp *cp, struct sppp *sp) 1766 { 1767 STDDCL; 1768 1769 if (debug) 1770 log(LOG_DEBUG, "%s: %s up(%s)\n", 1771 ifp->if_xname, cp->name, 1772 sppp_state_name(sp->state[cp->protoidx])); 1773 1774 switch (sp->state[cp->protoidx]) { 1775 case STATE_INITIAL: 1776 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1777 break; 1778 case STATE_STARTING: 1779 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1780 (cp->scr)(sp); 1781 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1782 break; 1783 default: 1784 printf("%s: %s illegal up in state %s\n", 1785 ifp->if_xname, cp->name, 1786 sppp_state_name(sp->state[cp->protoidx])); 1787 } 1788 } 1789 1790 static void 1791 sppp_down_event(const struct cp *cp, struct sppp *sp) 1792 { 1793 STDDCL; 1794 1795 if (debug) 1796 log(LOG_DEBUG, "%s: %s down(%s)\n", 1797 ifp->if_xname, cp->name, 1798 sppp_state_name(sp->state[cp->protoidx])); 1799 1800 switch (sp->state[cp->protoidx]) { 1801 case STATE_CLOSED: 1802 case STATE_CLOSING: 1803 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1804 break; 1805 case STATE_STOPPED: 1806 (cp->tls)(sp); 1807 /* fall through */ 1808 case STATE_STOPPING: 1809 case STATE_REQ_SENT: 1810 case STATE_ACK_RCVD: 1811 case STATE_ACK_SENT: 1812 sppp_cp_change_state(cp, sp, STATE_STARTING); 1813 break; 1814 case STATE_OPENED: 1815 (cp->tld)(sp); 1816 sppp_cp_change_state(cp, sp, STATE_STARTING); 1817 break; 1818 default: 1819 printf("%s: %s illegal down in state %s\n", 1820 ifp->if_xname, cp->name, 1821 sppp_state_name(sp->state[cp->protoidx])); 1822 } 1823 } 1824 1825 1826 static void 1827 sppp_open_event(const struct cp *cp, struct sppp *sp) 1828 { 1829 STDDCL; 1830 1831 if (debug) 1832 log(LOG_DEBUG, "%s: %s open(%s)\n", 1833 ifp->if_xname, cp->name, 1834 sppp_state_name(sp->state[cp->protoidx])); 1835 1836 switch (sp->state[cp->protoidx]) { 1837 case STATE_INITIAL: 1838 sppp_cp_change_state(cp, sp, STATE_STARTING); 1839 (cp->tls)(sp); 1840 break; 1841 case STATE_STARTING: 1842 break; 1843 case STATE_CLOSED: 1844 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1845 (cp->scr)(sp); 1846 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1847 break; 1848 case STATE_STOPPED: 1849 case STATE_STOPPING: 1850 case STATE_REQ_SENT: 1851 case STATE_ACK_RCVD: 1852 case STATE_ACK_SENT: 1853 case STATE_OPENED: 1854 break; 1855 case STATE_CLOSING: 1856 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1857 break; 1858 } 1859 } 1860 1861 1862 static void 1863 sppp_close_event(const struct cp *cp, struct sppp *sp) 1864 { 1865 STDDCL; 1866 1867 if (debug) 1868 log(LOG_DEBUG, "%s: %s close(%s)\n", 1869 ifp->if_xname, cp->name, 1870 sppp_state_name(sp->state[cp->protoidx])); 1871 1872 switch (sp->state[cp->protoidx]) { 1873 case STATE_INITIAL: 1874 case STATE_CLOSED: 1875 case STATE_CLOSING: 1876 break; 1877 case STATE_STARTING: 1878 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1879 (cp->tlf)(sp); 1880 break; 1881 case STATE_STOPPED: 1882 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1883 break; 1884 case STATE_STOPPING: 1885 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1886 break; 1887 case STATE_OPENED: 1888 (cp->tld)(sp); 1889 /* fall through */ 1890 case STATE_REQ_SENT: 1891 case STATE_ACK_RCVD: 1892 case STATE_ACK_SENT: 1893 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1894 sppp_cp_send(sp, cp->proto, TERM_REQ, 1895 ++sp->pp_seq[cp->protoidx], 0, 0); 1896 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1897 break; 1898 } 1899 } 1900 1901 static void 1902 sppp_to_event(const struct cp *cp, struct sppp *sp) 1903 { 1904 STDDCL; 1905 int s; 1906 1907 s = splnet(); 1908 if (debug) 1909 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1910 ifp->if_xname, cp->name, 1911 sppp_state_name(sp->state[cp->protoidx]), 1912 sp->rst_counter[cp->protoidx]); 1913 1914 if (--sp->rst_counter[cp->protoidx] < 0) 1915 /* TO- event */ 1916 switch (sp->state[cp->protoidx]) { 1917 case STATE_CLOSING: 1918 (cp->tlf)(sp); 1919 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1920 sppp_lcp_check_and_close(sp); 1921 break; 1922 case STATE_STOPPING: 1923 (cp->tlf)(sp); 1924 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1925 sppp_lcp_check_and_close(sp); 1926 break; 1927 case STATE_REQ_SENT: 1928 case STATE_ACK_RCVD: 1929 case STATE_ACK_SENT: 1930 (cp->tlf)(sp); 1931 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1932 sppp_lcp_check_and_close(sp); 1933 break; 1934 } 1935 else 1936 /* TO+ event */ 1937 switch (sp->state[cp->protoidx]) { 1938 case STATE_CLOSING: 1939 case STATE_STOPPING: 1940 sppp_cp_send(sp, cp->proto, TERM_REQ, 1941 ++sp->pp_seq[cp->protoidx], 0, 0); 1942 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1943 cp->TO, sp); 1944 break; 1945 case STATE_REQ_SENT: 1946 case STATE_ACK_RCVD: 1947 (cp->scr)(sp); 1948 /* sppp_cp_change_state() will restart the timer */ 1949 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1950 break; 1951 case STATE_ACK_SENT: 1952 (cp->scr)(sp); 1953 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1954 cp->TO, sp); 1955 break; 1956 } 1957 1958 splx(s); 1959 } 1960 1961 /* 1962 * Change the state of a control protocol in the state automaton. 1963 * Takes care of starting/stopping the restart timer. 1964 */ 1965 void 1966 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1967 { 1968 sp->state[cp->protoidx] = newstate; 1969 callout_stop(&sp->ch[cp->protoidx]); 1970 switch (newstate) { 1971 case STATE_INITIAL: 1972 case STATE_STARTING: 1973 case STATE_CLOSED: 1974 case STATE_STOPPED: 1975 case STATE_OPENED: 1976 break; 1977 case STATE_CLOSING: 1978 case STATE_STOPPING: 1979 case STATE_REQ_SENT: 1980 case STATE_ACK_RCVD: 1981 case STATE_ACK_SENT: 1982 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1983 cp->TO, sp); 1984 break; 1985 } 1986 } 1987 1988 /* 1989 *--------------------------------------------------------------------------* 1990 * * 1991 * The LCP implementation. * 1992 * * 1993 *--------------------------------------------------------------------------* 1994 */ 1995 static void 1996 sppp_lcp_init(struct sppp *sp) 1997 { 1998 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1999 sp->lcp.magic = 0; 2000 sp->state[IDX_LCP] = STATE_INITIAL; 2001 sp->fail_counter[IDX_LCP] = 0; 2002 sp->pp_seq[IDX_LCP] = 0; 2003 sp->pp_rseq[IDX_LCP] = 0; 2004 sp->lcp.protos = 0; 2005 2006 /* 2007 * Initialize counters and timeout values. Note that we don't 2008 * use the 3 seconds suggested in RFC 1661 since we are likely 2009 * running on a fast link. XXX We should probably implement 2010 * the exponential backoff option. Note that these values are 2011 * relevant for all control protocols, not just LCP only. 2012 */ 2013 sp->lcp.timeout = 1 * hz; 2014 sp->lcp.max_terminate = 2; 2015 sp->lcp.max_configure = 10; 2016 sp->lcp.max_failure = 10; 2017 callout_init(&sp->ch[IDX_LCP], 0); 2018 } 2019 2020 static void 2021 sppp_lcp_up(struct sppp *sp) 2022 { 2023 STDDCL; 2024 2025 /* Initialize activity timestamp: opening a connection is an activity */ 2026 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2027 2028 /* 2029 * If this interface is passive or dial-on-demand, and we are 2030 * still in Initial state, it means we've got an incoming 2031 * call. Activate the interface. 2032 */ 2033 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2034 if (debug) 2035 log(LOG_DEBUG, 2036 "%s: Up event", ifp->if_xname); 2037 ifp->if_flags |= IFF_RUNNING; 2038 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2039 if (debug) 2040 addlog("(incoming call)\n"); 2041 sp->pp_flags |= PP_CALLIN; 2042 lcp.Open(sp); 2043 } else if (debug) 2044 addlog("\n"); 2045 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2046 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2047 ifp->if_flags |= IFF_RUNNING; 2048 lcp.Open(sp); 2049 } 2050 2051 sppp_up_event(&lcp, sp); 2052 } 2053 2054 static void 2055 sppp_lcp_down(struct sppp *sp) 2056 { 2057 STDDCL; 2058 2059 sppp_down_event(&lcp, sp); 2060 2061 /* 2062 * If this is neither a dial-on-demand nor a passive 2063 * interface, simulate an ``ifconfig down'' action, so the 2064 * administrator can force a redial by another ``ifconfig 2065 * up''. XXX For leased line operation, should we immediately 2066 * try to reopen the connection here? 2067 */ 2068 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2069 if (debug) 2070 log(LOG_INFO, 2071 "%s: Down event (carrier loss), taking interface down.\n", 2072 ifp->if_xname); 2073 if_down(ifp); 2074 } else { 2075 if (debug) 2076 log(LOG_DEBUG, 2077 "%s: Down event (carrier loss)\n", 2078 ifp->if_xname); 2079 } 2080 sp->pp_flags &= ~PP_CALLIN; 2081 if (sp->state[IDX_LCP] != STATE_INITIAL) 2082 lcp.Close(sp); 2083 ifp->if_flags &= ~IFF_RUNNING; 2084 } 2085 2086 static void 2087 sppp_lcp_open(struct sppp *sp) 2088 { 2089 if (sp->pp_if.if_mtu < PP_MTU) { 2090 sp->lcp.mru = sp->pp_if.if_mtu; 2091 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2092 } else 2093 sp->lcp.mru = PP_MTU; 2094 sp->lcp.their_mru = PP_MTU; 2095 2096 /* 2097 * If we are authenticator, negotiate LCP_AUTH 2098 */ 2099 if (sp->hisauth.proto != 0) 2100 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2101 else 2102 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2103 sp->pp_flags &= ~PP_NEEDAUTH; 2104 sppp_open_event(&lcp, sp); 2105 } 2106 2107 static void 2108 sppp_lcp_close(struct sppp *sp) 2109 { 2110 sppp_close_event(&lcp, sp); 2111 } 2112 2113 static void 2114 sppp_lcp_TO(void *cookie) 2115 { 2116 sppp_to_event(&lcp, (struct sppp *)cookie); 2117 } 2118 2119 /* 2120 * Analyze a configure request. Return true if it was agreeable, and 2121 * caused action sca, false if it has been rejected or nak'ed, and 2122 * caused action scn. (The return value is used to make the state 2123 * transition decision in the state automaton.) 2124 */ 2125 static int 2126 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2127 { 2128 STDDCL; 2129 u_char *buf, *r, *p, l, blen; 2130 int origlen, rlen; 2131 uint32_t nmagic; 2132 u_short authproto; 2133 2134 len -= 4; 2135 origlen = len; 2136 buf = r = malloc (blen = len, M_TEMP, M_NOWAIT); 2137 if (! buf) 2138 return (0); 2139 2140 if (debug) 2141 log(LOG_DEBUG, "%s: lcp parse opts:", 2142 ifp->if_xname); 2143 2144 /* pass 1: check for things that need to be rejected */ 2145 p = (void *)(h + 1); 2146 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2147 /* Sanity check option length */ 2148 if (l > len) { 2149 /* 2150 * Malicious option - drop immediately. 2151 * XXX Maybe we should just RXJ it? 2152 */ 2153 addlog("%s: received malicious LCP option 0x%02x, " 2154 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2155 p[0], l, len); 2156 goto drop; 2157 } 2158 if (debug) 2159 addlog(" %s", sppp_lcp_opt_name(*p)); 2160 switch (*p) { 2161 case LCP_OPT_MAGIC: 2162 /* Magic number. */ 2163 /* fall through, both are same length */ 2164 case LCP_OPT_ASYNC_MAP: 2165 /* Async control character map. */ 2166 if (len >= 6 || l == 6) 2167 continue; 2168 if (debug) 2169 addlog(" [invalid]"); 2170 break; 2171 case LCP_OPT_MRU: 2172 /* Maximum receive unit. */ 2173 if (len >= 4 && l == 4) 2174 continue; 2175 if (debug) 2176 addlog(" [invalid]"); 2177 break; 2178 case LCP_OPT_AUTH_PROTO: 2179 if (len < 4) { 2180 if (debug) 2181 addlog(" [invalid]"); 2182 break; 2183 } 2184 authproto = (p[2] << 8) + p[3]; 2185 if (authproto == PPP_CHAP && l != 5) { 2186 if (debug) 2187 addlog(" [invalid chap len]"); 2188 break; 2189 } 2190 if (sp->myauth.proto == 0) { 2191 /* we are not configured to do auth */ 2192 if (debug) 2193 addlog(" [not configured]"); 2194 break; 2195 } 2196 /* 2197 * Remote want us to authenticate, remember this, 2198 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2199 * up. 2200 */ 2201 sp->pp_flags |= PP_NEEDAUTH; 2202 continue; 2203 default: 2204 /* Others not supported. */ 2205 if (debug) 2206 addlog(" [rej]"); 2207 break; 2208 } 2209 if (rlen + l > blen) { 2210 if (debug) 2211 addlog(" [overflow]"); 2212 continue; 2213 } 2214 /* Add the option to rejected list. */ 2215 memcpy(r, p, l); 2216 r += l; 2217 rlen += l; 2218 } 2219 if (rlen) { 2220 if (debug) 2221 addlog(" send conf-rej\n"); 2222 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2223 goto end; 2224 } else if (debug) 2225 addlog("\n"); 2226 2227 /* 2228 * pass 2: check for option values that are unacceptable and 2229 * thus require to be nak'ed. 2230 */ 2231 if (debug) 2232 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2233 ifp->if_xname); 2234 2235 p = (void *)(h + 1); 2236 len = origlen; 2237 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2238 if (debug) 2239 addlog(" %s", sppp_lcp_opt_name(*p)); 2240 switch (*p) { 2241 case LCP_OPT_MAGIC: 2242 /* Magic number -- extract. */ 2243 nmagic = (uint32_t)p[2] << 24 | 2244 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2245 if (nmagic != sp->lcp.magic) { 2246 if (debug) 2247 addlog(" 0x%x", nmagic); 2248 continue; 2249 } 2250 /* 2251 * Local and remote magics equal -- loopback? 2252 */ 2253 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2254 printf ("%s: loopback\n", 2255 ifp->if_xname); 2256 sp->pp_loopcnt = 0; 2257 if (ifp->if_flags & IFF_UP) { 2258 if_down(ifp); 2259 IF_PURGE(&sp->pp_cpq); 2260 /* XXX ? */ 2261 lcp.Down(sp); 2262 lcp.Up(sp); 2263 } 2264 } else if (debug) 2265 addlog(" [glitch]"); 2266 ++sp->pp_loopcnt; 2267 /* 2268 * We negate our magic here, and NAK it. If 2269 * we see it later in an NAK packet, we 2270 * suggest a new one. 2271 */ 2272 nmagic = ~sp->lcp.magic; 2273 /* Gonna NAK it. */ 2274 p[2] = nmagic >> 24; 2275 p[3] = nmagic >> 16; 2276 p[4] = nmagic >> 8; 2277 p[5] = nmagic; 2278 break; 2279 2280 case LCP_OPT_ASYNC_MAP: 2281 /* 2282 * Async control character map -- just ignore it. 2283 * 2284 * Quote from RFC 1662, chapter 6: 2285 * To enable this functionality, synchronous PPP 2286 * implementations MUST always respond to the 2287 * Async-Control-Character-Map Configuration 2288 * Option with the LCP Configure-Ack. However, 2289 * acceptance of the Configuration Option does 2290 * not imply that the synchronous implementation 2291 * will do any ACCM mapping. Instead, all such 2292 * octet mapping will be performed by the 2293 * asynchronous-to-synchronous converter. 2294 */ 2295 continue; 2296 2297 case LCP_OPT_MRU: 2298 /* 2299 * Maximum receive unit. Always agreeable, 2300 * but ignored by now. 2301 */ 2302 sp->lcp.their_mru = p[2] * 256 + p[3]; 2303 if (debug) 2304 addlog(" %ld", sp->lcp.their_mru); 2305 continue; 2306 2307 case LCP_OPT_AUTH_PROTO: 2308 authproto = (p[2] << 8) + p[3]; 2309 if (sp->myauth.proto != authproto) { 2310 /* not agreed, nak */ 2311 if (debug) 2312 addlog(" [mine %s != his %s]", 2313 sppp_proto_name(sp->myauth.proto), 2314 sppp_proto_name(authproto)); 2315 p[2] = sp->myauth.proto >> 8; 2316 p[3] = sp->myauth.proto; 2317 break; 2318 } 2319 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2320 if (debug) 2321 addlog(" [chap not MD5]"); 2322 p[4] = CHAP_MD5; 2323 break; 2324 } 2325 continue; 2326 } 2327 if (rlen + l > blen) { 2328 if (debug) 2329 addlog(" [overflow]"); 2330 continue; 2331 } 2332 /* Add the option to nak'ed list. */ 2333 memcpy(r, p, l); 2334 r += l; 2335 rlen += l; 2336 } 2337 if (rlen) { 2338 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2339 if (debug) 2340 addlog(" max_failure (%d) exceeded, " 2341 "send conf-rej\n", 2342 sp->lcp.max_failure); 2343 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2344 } else { 2345 if (debug) 2346 addlog(" send conf-nak\n"); 2347 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2348 } 2349 goto end; 2350 } else { 2351 if (debug) 2352 addlog(" send conf-ack\n"); 2353 sp->fail_counter[IDX_LCP] = 0; 2354 sp->pp_loopcnt = 0; 2355 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2356 } 2357 2358 end: 2359 free(buf, M_TEMP); 2360 return (rlen == 0); 2361 2362 drop: 2363 free(buf, M_TEMP); 2364 return -1; 2365 } 2366 2367 /* 2368 * Analyze the LCP Configure-Reject option list, and adjust our 2369 * negotiation. 2370 */ 2371 static void 2372 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2373 { 2374 STDDCL; 2375 u_char *buf, *p, l; 2376 2377 len -= 4; 2378 buf = malloc (len, M_TEMP, M_NOWAIT); 2379 if (!buf) 2380 return; 2381 2382 if (debug) 2383 log(LOG_DEBUG, "%s: lcp rej opts:", 2384 ifp->if_xname); 2385 2386 p = (void *)(h + 1); 2387 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2388 /* Sanity check option length */ 2389 if (l > len) { 2390 /* 2391 * Malicious option - drop immediately. 2392 * XXX Maybe we should just RXJ it? 2393 */ 2394 addlog("%s: received malicious LCP option, " 2395 "dropping.\n", ifp->if_xname); 2396 goto drop; 2397 } 2398 if (debug) 2399 addlog(" %s", sppp_lcp_opt_name(*p)); 2400 switch (*p) { 2401 case LCP_OPT_MAGIC: 2402 /* Magic number -- can't use it, use 0 */ 2403 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2404 sp->lcp.magic = 0; 2405 break; 2406 case LCP_OPT_MRU: 2407 /* 2408 * We try to negotiate a lower MRU if the underlying 2409 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2410 * peer rejects this lower rate, fallback to the 2411 * default. 2412 */ 2413 if (debug) { 2414 addlog("%s: warning: peer rejected our MRU of " 2415 "%ld bytes. Defaulting to %d bytes\n", 2416 ifp->if_xname, sp->lcp.mru, PP_MTU); 2417 } 2418 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2419 sp->lcp.mru = PP_MTU; 2420 break; 2421 case LCP_OPT_AUTH_PROTO: 2422 /* 2423 * Peer doesn't want to authenticate himself, 2424 * deny unless this is a dialout call, and 2425 * SPPP_AUTHFLAG_NOCALLOUT is set. 2426 */ 2427 if ((sp->pp_flags & PP_CALLIN) == 0 && 2428 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2429 if (debug) 2430 addlog(" [don't insist on auth " 2431 "for callout]"); 2432 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2433 break; 2434 } 2435 if (debug) 2436 addlog("[access denied]\n"); 2437 lcp.Close(sp); 2438 break; 2439 } 2440 } 2441 if (debug) 2442 addlog("\n"); 2443 drop: 2444 free(buf, M_TEMP); 2445 return; 2446 } 2447 2448 /* 2449 * Analyze the LCP Configure-NAK option list, and adjust our 2450 * negotiation. 2451 */ 2452 static void 2453 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2454 { 2455 STDDCL; 2456 u_char *buf, *p, l, blen; 2457 uint32_t magic; 2458 2459 len -= 4; 2460 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 2461 if (!buf) 2462 return; 2463 2464 if (debug) 2465 log(LOG_DEBUG, "%s: lcp nak opts:", 2466 ifp->if_xname); 2467 2468 p = (void *)(h + 1); 2469 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2470 /* Sanity check option length */ 2471 if (l > len) { 2472 /* 2473 * Malicious option - drop immediately. 2474 * XXX Maybe we should just RXJ it? 2475 */ 2476 addlog("%s: received malicious LCP option, " 2477 "dropping.\n", ifp->if_xname); 2478 goto drop; 2479 } 2480 if (debug) 2481 addlog(" %s", sppp_lcp_opt_name(*p)); 2482 switch (*p) { 2483 case LCP_OPT_MAGIC: 2484 /* Magic number -- renegotiate */ 2485 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2486 len >= 6 && l == 6) { 2487 magic = (uint32_t)p[2] << 24 | 2488 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2489 /* 2490 * If the remote magic is our negated one, 2491 * this looks like a loopback problem. 2492 * Suggest a new magic to make sure. 2493 */ 2494 if (magic == ~sp->lcp.magic) { 2495 if (debug) 2496 addlog(" magic glitch"); 2497 sp->lcp.magic = cprng_fast32(); 2498 } else { 2499 sp->lcp.magic = magic; 2500 if (debug) 2501 addlog(" %d", magic); 2502 } 2503 } 2504 break; 2505 case LCP_OPT_MRU: 2506 /* 2507 * Peer wants to advise us to negotiate an MRU. 2508 * Agree on it if it's reasonable, or use 2509 * default otherwise. 2510 */ 2511 if (len >= 4 && l == 4) { 2512 u_int mru = p[2] * 256 + p[3]; 2513 if (debug) 2514 addlog(" %d", mru); 2515 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2516 mru = sp->pp_if.if_mtu; 2517 sp->lcp.mru = mru; 2518 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2519 } 2520 break; 2521 case LCP_OPT_AUTH_PROTO: 2522 /* 2523 * Peer doesn't like our authentication method, 2524 * deny. 2525 */ 2526 if (debug) 2527 addlog("[access denied]\n"); 2528 lcp.Close(sp); 2529 break; 2530 } 2531 } 2532 if (debug) 2533 addlog("\n"); 2534 drop: 2535 free(buf, M_TEMP); 2536 return; 2537 } 2538 2539 static void 2540 sppp_lcp_tlu(struct sppp *sp) 2541 { 2542 struct ifnet *ifp = &sp->pp_if; 2543 int i; 2544 uint32_t mask; 2545 2546 /* XXX ? */ 2547 if (! (ifp->if_flags & IFF_UP) && 2548 (ifp->if_flags & IFF_RUNNING)) { 2549 /* Coming out of loopback mode. */ 2550 if_up(ifp); 2551 } 2552 2553 for (i = 0; i < IDX_COUNT; i++) 2554 if ((cps[i])->flags & CP_QUAL) 2555 (cps[i])->Open(sp); 2556 2557 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2558 (sp->pp_flags & PP_NEEDAUTH) != 0) 2559 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 2560 else 2561 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 2562 2563 /* 2564 * Open all authentication protocols. This is even required 2565 * if we already proceeded to network phase, since it might be 2566 * that remote wants us to authenticate, so we might have to 2567 * send a PAP request. Undesired authentication protocols 2568 * don't do anything when they get an Open event. 2569 */ 2570 for (i = 0; i < IDX_COUNT; i++) 2571 if ((cps[i])->flags & CP_AUTH) 2572 (cps[i])->Open(sp); 2573 2574 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2575 /* Notify all NCPs. */ 2576 for (i = 0; i < IDX_COUNT; i++) 2577 if ((cps[i])->flags & CP_NCP) 2578 (cps[i])->Open(sp); 2579 } 2580 2581 /* Send Up events to all started protos. */ 2582 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2583 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2584 (cps[i])->Up(sp); 2585 2586 /* notify low-level driver of state change */ 2587 if (sp->pp_chg) 2588 sp->pp_chg(sp, (int)sp->pp_phase); 2589 2590 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2591 /* if no NCP is starting, close down */ 2592 sppp_lcp_check_and_close(sp); 2593 } 2594 2595 static void 2596 sppp_lcp_tld(struct sppp *sp) 2597 { 2598 int i; 2599 uint32_t mask; 2600 2601 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 2602 2603 /* 2604 * Take upper layers down. We send the Down event first and 2605 * the Close second to prevent the upper layers from sending 2606 * ``a flurry of terminate-request packets'', as the RFC 2607 * describes it. 2608 */ 2609 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2610 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2611 (cps[i])->Down(sp); 2612 (cps[i])->Close(sp); 2613 } 2614 } 2615 2616 static void 2617 sppp_lcp_tls(struct sppp *sp) 2618 { 2619 2620 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2621 printf("%s: authentication failed %d times, not retrying again\n", 2622 sp->pp_if.if_xname, sp->pp_auth_failures); 2623 if_down(&sp->pp_if); 2624 return; 2625 } 2626 2627 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 2628 2629 /* Notify lower layer if desired. */ 2630 if (sp->pp_tls) 2631 (sp->pp_tls)(sp); 2632 } 2633 2634 static void 2635 sppp_lcp_tlf(struct sppp *sp) 2636 { 2637 2638 sppp_change_phase(sp, SPPP_PHASE_DEAD); 2639 2640 /* Notify lower layer if desired. */ 2641 if (sp->pp_tlf) 2642 (sp->pp_tlf)(sp); 2643 } 2644 2645 static void 2646 sppp_lcp_scr(struct sppp *sp) 2647 { 2648 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2649 int i = 0; 2650 u_short authproto; 2651 2652 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2653 if (! sp->lcp.magic) 2654 sp->lcp.magic = cprng_fast32(); 2655 opt[i++] = LCP_OPT_MAGIC; 2656 opt[i++] = 6; 2657 opt[i++] = sp->lcp.magic >> 24; 2658 opt[i++] = sp->lcp.magic >> 16; 2659 opt[i++] = sp->lcp.magic >> 8; 2660 opt[i++] = sp->lcp.magic; 2661 } 2662 2663 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2664 opt[i++] = LCP_OPT_MRU; 2665 opt[i++] = 4; 2666 opt[i++] = sp->lcp.mru >> 8; 2667 opt[i++] = sp->lcp.mru; 2668 } 2669 2670 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2671 authproto = sp->hisauth.proto; 2672 opt[i++] = LCP_OPT_AUTH_PROTO; 2673 opt[i++] = authproto == PPP_CHAP? 5: 4; 2674 opt[i++] = authproto >> 8; 2675 opt[i++] = authproto; 2676 if (authproto == PPP_CHAP) 2677 opt[i++] = CHAP_MD5; 2678 } 2679 2680 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2681 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2682 } 2683 2684 /* 2685 * Check the open NCPs, return true if at least one NCP is open. 2686 */ 2687 static int 2688 sppp_ncp_check(struct sppp *sp) 2689 { 2690 int i, mask; 2691 2692 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2693 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2694 return 1; 2695 return 0; 2696 } 2697 2698 /* 2699 * Re-check the open NCPs and see if we should terminate the link. 2700 * Called by the NCPs during their tlf action handling. 2701 */ 2702 static void 2703 sppp_lcp_check_and_close(struct sppp *sp) 2704 { 2705 2706 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2707 /* don't bother, we are already going down */ 2708 return; 2709 2710 if (sppp_ncp_check(sp)) 2711 return; 2712 2713 lcp.Close(sp); 2714 } 2715 2716 2717 /* 2718 *--------------------------------------------------------------------------* 2719 * * 2720 * The IPCP implementation. * 2721 * * 2722 *--------------------------------------------------------------------------* 2723 */ 2724 2725 static void 2726 sppp_ipcp_init(struct sppp *sp) 2727 { 2728 sp->ipcp.opts = 0; 2729 sp->ipcp.flags = 0; 2730 sp->state[IDX_IPCP] = STATE_INITIAL; 2731 sp->fail_counter[IDX_IPCP] = 0; 2732 sp->pp_seq[IDX_IPCP] = 0; 2733 sp->pp_rseq[IDX_IPCP] = 0; 2734 callout_init(&sp->ch[IDX_IPCP], 0); 2735 } 2736 2737 static void 2738 sppp_ipcp_up(struct sppp *sp) 2739 { 2740 sppp_up_event(&ipcp, sp); 2741 } 2742 2743 static void 2744 sppp_ipcp_down(struct sppp *sp) 2745 { 2746 sppp_down_event(&ipcp, sp); 2747 } 2748 2749 static void 2750 sppp_ipcp_open(struct sppp *sp) 2751 { 2752 STDDCL; 2753 uint32_t myaddr, hisaddr; 2754 2755 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2756 sp->ipcp.req_myaddr = 0; 2757 sp->ipcp.req_hisaddr = 0; 2758 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2759 2760 #ifdef INET 2761 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2762 #else 2763 myaddr = hisaddr = 0; 2764 #endif 2765 /* 2766 * If we don't have his address, this probably means our 2767 * interface doesn't want to talk IP at all. (This could 2768 * be the case if somebody wants to speak only IPX, for 2769 * example.) Don't open IPCP in this case. 2770 */ 2771 if (hisaddr == 0) { 2772 /* XXX this message should go away */ 2773 if (debug) 2774 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2775 ifp->if_xname); 2776 return; 2777 } 2778 2779 if (myaddr == 0) { 2780 /* 2781 * I don't have an assigned address, so i need to 2782 * negotiate my address. 2783 */ 2784 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2785 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2786 } 2787 if (hisaddr == 1) { 2788 /* 2789 * XXX - remove this hack! 2790 * remote has no valid address, we need to get one assigned. 2791 */ 2792 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2793 } 2794 sppp_open_event(&ipcp, sp); 2795 } 2796 2797 static void 2798 sppp_ipcp_close(struct sppp *sp) 2799 { 2800 STDDCL; 2801 2802 sppp_close_event(&ipcp, sp); 2803 #ifdef INET 2804 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2805 /* 2806 * Some address was dynamic, clear it again. 2807 */ 2808 sppp_clear_ip_addrs(sp); 2809 #endif 2810 2811 if (sp->pp_saved_mtu > 0) { 2812 ifp->if_mtu = sp->pp_saved_mtu; 2813 sp->pp_saved_mtu = 0; 2814 if (debug) 2815 log(LOG_DEBUG, 2816 "%s: resetting MTU to %" PRIu64 " bytes\n", 2817 ifp->if_xname, ifp->if_mtu); 2818 } 2819 } 2820 2821 static void 2822 sppp_ipcp_TO(void *cookie) 2823 { 2824 sppp_to_event(&ipcp, (struct sppp *)cookie); 2825 } 2826 2827 /* 2828 * Analyze a configure request. Return true if it was agreeable, and 2829 * caused action sca, false if it has been rejected or nak'ed, and 2830 * caused action scn. (The return value is used to make the state 2831 * transition decision in the state automaton.) 2832 */ 2833 static int 2834 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2835 { 2836 u_char *buf, *r, *p, l, blen; 2837 struct ifnet *ifp = &sp->pp_if; 2838 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2839 uint32_t hisaddr, desiredaddr; 2840 2841 len -= 4; 2842 origlen = len; 2843 /* 2844 * Make sure to allocate a buf that can at least hold a 2845 * conf-nak with an `address' option. We might need it below. 2846 */ 2847 blen = len < 6 ? 6 : len; 2848 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 2849 if (! buf) 2850 return (0); 2851 2852 /* pass 1: see if we can recognize them */ 2853 if (debug) 2854 log(LOG_DEBUG, "%s: ipcp parse opts:", 2855 ifp->if_xname); 2856 p = (void *)(h + 1); 2857 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2858 /* Sanity check option length */ 2859 if (l > len) { 2860 /* XXX should we just RXJ? */ 2861 addlog("%s: malicious IPCP option received, dropping\n", 2862 ifp->if_xname); 2863 goto drop; 2864 } 2865 if (debug) 2866 addlog(" %s", sppp_ipcp_opt_name(*p)); 2867 switch (*p) { 2868 #ifdef notyet 2869 case IPCP_OPT_COMPRESSION: 2870 if (len >= 6 && l >= 6) { 2871 /* correctly formed compress option */ 2872 continue; 2873 } 2874 if (debug) 2875 addlog(" [invalid]"); 2876 break; 2877 #endif 2878 case IPCP_OPT_ADDRESS: 2879 if (len >= 6 && l == 6) { 2880 /* correctly formed address option */ 2881 continue; 2882 } 2883 if (debug) 2884 addlog(" [invalid]"); 2885 break; 2886 default: 2887 /* Others not supported. */ 2888 if (debug) 2889 addlog(" [rej]"); 2890 break; 2891 } 2892 /* Add the option to rejected list. */ 2893 if (rlen + l > blen) { 2894 if (debug) 2895 addlog(" [overflow]"); 2896 continue; 2897 } 2898 memcpy(r, p, l); 2899 r += l; 2900 rlen += l; 2901 } 2902 if (rlen) { 2903 if (debug) 2904 addlog(" send conf-rej\n"); 2905 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2906 goto end; 2907 } else if (debug) 2908 addlog("\n"); 2909 2910 /* pass 2: parse option values */ 2911 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2912 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2913 else 2914 #ifdef INET 2915 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2916 #else 2917 hisaddr = 0; 2918 #endif 2919 if (debug) 2920 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2921 ifp->if_xname); 2922 p = (void *)(h + 1); 2923 len = origlen; 2924 for (rlen=0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 2925 if (debug) 2926 addlog(" %s", sppp_ipcp_opt_name(*p)); 2927 switch (*p) { 2928 #ifdef notyet 2929 case IPCP_OPT_COMPRESSION: 2930 continue; 2931 #endif 2932 case IPCP_OPT_ADDRESS: 2933 desiredaddr = p[2] << 24 | p[3] << 16 | 2934 p[4] << 8 | p[5]; 2935 if (desiredaddr == hisaddr || 2936 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2937 /* 2938 * Peer's address is same as our value, 2939 * this is agreeable. Gonna conf-ack 2940 * it. 2941 */ 2942 if (debug) 2943 addlog(" %s [ack]", 2944 sppp_dotted_quad(hisaddr)); 2945 /* record that we've seen it already */ 2946 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2947 sp->ipcp.req_hisaddr = desiredaddr; 2948 hisaddr = desiredaddr; 2949 continue; 2950 } 2951 /* 2952 * The address wasn't agreeable. This is either 2953 * he sent us 0.0.0.0, asking to assign him an 2954 * address, or he send us another address not 2955 * matching our value. Either case, we gonna 2956 * conf-nak it with our value. 2957 */ 2958 if (debug) { 2959 if (desiredaddr == 0) 2960 addlog(" [addr requested]"); 2961 else 2962 addlog(" %s [not agreed]", 2963 sppp_dotted_quad(desiredaddr)); 2964 } 2965 2966 p[2] = hisaddr >> 24; 2967 p[3] = hisaddr >> 16; 2968 p[4] = hisaddr >> 8; 2969 p[5] = hisaddr; 2970 break; 2971 } 2972 if (rlen + l > blen) { 2973 if (debug) 2974 addlog(" [overflow]"); 2975 continue; 2976 } 2977 /* Add the option to nak'ed list. */ 2978 memcpy(r, p, l); 2979 r += l; 2980 rlen += l; 2981 } 2982 2983 /* 2984 * If we are about to conf-ack the request, but haven't seen 2985 * his address so far, gonna conf-nak it instead, with the 2986 * `address' option present and our idea of his address being 2987 * filled in there, to request negotiation of both addresses. 2988 * 2989 * XXX This can result in an endless req - nak loop if peer 2990 * doesn't want to send us his address. Q: What should we do 2991 * about it? XXX A: implement the max-failure counter. 2992 */ 2993 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2994 buf[0] = IPCP_OPT_ADDRESS; 2995 buf[1] = 6; 2996 buf[2] = hisaddr >> 24; 2997 buf[3] = hisaddr >> 16; 2998 buf[4] = hisaddr >> 8; 2999 buf[5] = hisaddr; 3000 rlen = 6; 3001 if (debug) 3002 addlog(" still need hisaddr"); 3003 } 3004 3005 if (rlen) { 3006 if (debug) 3007 addlog(" send conf-nak\n"); 3008 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3009 } else { 3010 if (debug) 3011 addlog(" send conf-ack\n"); 3012 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 3013 } 3014 3015 end: 3016 free(buf, M_TEMP); 3017 return (rlen == 0); 3018 3019 drop: 3020 free(buf, M_TEMP); 3021 return -1; 3022 } 3023 3024 /* 3025 * Analyze the IPCP Configure-Reject option list, and adjust our 3026 * negotiation. 3027 */ 3028 static void 3029 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3030 { 3031 u_char *buf, *p, l, blen; 3032 struct ifnet *ifp = &sp->pp_if; 3033 int debug = ifp->if_flags & IFF_DEBUG; 3034 3035 len -= 4; 3036 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3037 if (!buf) 3038 return; 3039 3040 if (debug) 3041 log(LOG_DEBUG, "%s: ipcp rej opts:", 3042 ifp->if_xname); 3043 3044 p = (void *)(h + 1); 3045 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3046 /* Sanity check option length */ 3047 if (l > len) { 3048 /* XXX should we just RXJ? */ 3049 addlog("%s: malicious IPCP option received, dropping\n", 3050 ifp->if_xname); 3051 goto drop; 3052 } 3053 if (debug) 3054 addlog(" %s", sppp_ipcp_opt_name(*p)); 3055 switch (*p) { 3056 case IPCP_OPT_ADDRESS: 3057 /* 3058 * Peer doesn't grok address option. This is 3059 * bad. XXX Should we better give up here? 3060 */ 3061 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3062 break; 3063 #ifdef notyet 3064 case IPCP_OPT_COMPRESS: 3065 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3066 break; 3067 #endif 3068 } 3069 } 3070 if (debug) 3071 addlog("\n"); 3072 drop: 3073 free(buf, M_TEMP); 3074 return; 3075 } 3076 3077 /* 3078 * Analyze the IPCP Configure-NAK option list, and adjust our 3079 * negotiation. 3080 */ 3081 static void 3082 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3083 { 3084 u_char *p, l; 3085 struct ifnet *ifp = &sp->pp_if; 3086 int debug = ifp->if_flags & IFF_DEBUG; 3087 uint32_t wantaddr; 3088 3089 len -= 4; 3090 3091 if (debug) 3092 log(LOG_DEBUG, "%s: ipcp nak opts:", 3093 ifp->if_xname); 3094 3095 p = (void *)(h + 1); 3096 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3097 /* Sanity check option length */ 3098 if (l > len) { 3099 /* XXX should we just RXJ? */ 3100 addlog("%s: malicious IPCP option received, dropping\n", 3101 ifp->if_xname); 3102 return; 3103 } 3104 if (debug) 3105 addlog(" %s", sppp_ipcp_opt_name(*p)); 3106 switch (*p) { 3107 case IPCP_OPT_ADDRESS: 3108 /* 3109 * Peer doesn't like our local IP address. See 3110 * if we can do something for him. We'll drop 3111 * him our address then. 3112 */ 3113 if (len >= 6 && l == 6) { 3114 wantaddr = p[2] << 24 | p[3] << 16 | 3115 p[4] << 8 | p[5]; 3116 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3117 if (debug) 3118 addlog(" [wantaddr %s]", 3119 sppp_dotted_quad(wantaddr)); 3120 /* 3121 * When doing dynamic address assignment, 3122 * we accept his offer. Otherwise, we 3123 * ignore it and thus continue to negotiate 3124 * our already existing value. 3125 */ 3126 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3127 if (debug) 3128 addlog(" [agree]"); 3129 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3130 sp->ipcp.req_myaddr = wantaddr; 3131 } 3132 } 3133 break; 3134 3135 case IPCP_OPT_PRIMDNS: 3136 if (len >= 6 && l == 6) { 3137 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3138 p[4] << 8 | p[5]; 3139 } 3140 break; 3141 3142 case IPCP_OPT_SECDNS: 3143 if (len >= 6 && l == 6) { 3144 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3145 p[4] << 8 | p[5]; 3146 } 3147 break; 3148 #ifdef notyet 3149 case IPCP_OPT_COMPRESS: 3150 /* 3151 * Peer wants different compression parameters. 3152 */ 3153 break; 3154 #endif 3155 } 3156 } 3157 if (debug) 3158 addlog("\n"); 3159 } 3160 3161 static void 3162 sppp_ipcp_tlu(struct sppp *sp) 3163 { 3164 #ifdef INET 3165 /* we are up. Set addresses and notify anyone interested */ 3166 STDDCL; 3167 uint32_t myaddr, hisaddr; 3168 3169 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3170 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3171 myaddr = sp->ipcp.req_myaddr; 3172 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3173 hisaddr = sp->ipcp.req_hisaddr; 3174 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3175 3176 if (ifp->if_mtu > sp->lcp.their_mru) { 3177 sp->pp_saved_mtu = ifp->if_mtu; 3178 ifp->if_mtu = sp->lcp.their_mru; 3179 if (debug) 3180 log(LOG_DEBUG, 3181 "%s: setting MTU to %" PRIu64 " bytes\n", 3182 ifp->if_xname, ifp->if_mtu); 3183 } 3184 3185 if (sp->pp_con) 3186 sp->pp_con(sp); 3187 #endif 3188 } 3189 3190 static void 3191 sppp_ipcp_tld(struct sppp *sp) 3192 { 3193 } 3194 3195 static void 3196 sppp_ipcp_tls(struct sppp *sp) 3197 { 3198 /* indicate to LCP that it must stay alive */ 3199 sp->lcp.protos |= (1 << IDX_IPCP); 3200 } 3201 3202 static void 3203 sppp_ipcp_tlf(struct sppp *sp) 3204 { 3205 /* we no longer need LCP */ 3206 sp->lcp.protos &= ~(1 << IDX_IPCP); 3207 } 3208 3209 static void 3210 sppp_ipcp_scr(struct sppp *sp) 3211 { 3212 uint8_t opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3213 #ifdef INET 3214 uint32_t ouraddr; 3215 #endif 3216 int i = 0; 3217 3218 #ifdef notyet 3219 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3220 opt[i++] = IPCP_OPT_COMPRESSION; 3221 opt[i++] = 6; 3222 opt[i++] = 0; /* VJ header compression */ 3223 opt[i++] = 0x2d; /* VJ header compression */ 3224 opt[i++] = max_slot_id; 3225 opt[i++] = comp_slot_id; 3226 } 3227 #endif 3228 3229 #ifdef INET 3230 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3231 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3232 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3233 else 3234 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3235 opt[i++] = IPCP_OPT_ADDRESS; 3236 opt[i++] = 6; 3237 opt[i++] = ouraddr >> 24; 3238 opt[i++] = ouraddr >> 16; 3239 opt[i++] = ouraddr >> 8; 3240 opt[i++] = ouraddr; 3241 } 3242 #endif 3243 3244 if (sp->query_dns & 1) { 3245 opt[i++] = IPCP_OPT_PRIMDNS; 3246 opt[i++] = 6; 3247 opt[i++] = sp->dns_addrs[0] >> 24; 3248 opt[i++] = sp->dns_addrs[0] >> 16; 3249 opt[i++] = sp->dns_addrs[0] >> 8; 3250 opt[i++] = sp->dns_addrs[0]; 3251 } 3252 if (sp->query_dns & 2) { 3253 opt[i++] = IPCP_OPT_SECDNS; 3254 opt[i++] = 6; 3255 opt[i++] = sp->dns_addrs[1] >> 24; 3256 opt[i++] = sp->dns_addrs[1] >> 16; 3257 opt[i++] = sp->dns_addrs[1] >> 8; 3258 opt[i++] = sp->dns_addrs[1]; 3259 } 3260 3261 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3262 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3263 } 3264 3265 3266 /* 3267 *--------------------------------------------------------------------------* 3268 * * 3269 * The IPv6CP implementation. * 3270 * * 3271 *--------------------------------------------------------------------------* 3272 */ 3273 3274 #ifdef INET6 3275 static void 3276 sppp_ipv6cp_init(struct sppp *sp) 3277 { 3278 sp->ipv6cp.opts = 0; 3279 sp->ipv6cp.flags = 0; 3280 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3281 sp->fail_counter[IDX_IPV6CP] = 0; 3282 sp->pp_seq[IDX_IPV6CP] = 0; 3283 sp->pp_rseq[IDX_IPV6CP] = 0; 3284 callout_init(&sp->ch[IDX_IPV6CP], 0); 3285 } 3286 3287 static void 3288 sppp_ipv6cp_up(struct sppp *sp) 3289 { 3290 sppp_up_event(&ipv6cp, sp); 3291 } 3292 3293 static void 3294 sppp_ipv6cp_down(struct sppp *sp) 3295 { 3296 sppp_down_event(&ipv6cp, sp); 3297 } 3298 3299 static void 3300 sppp_ipv6cp_open(struct sppp *sp) 3301 { 3302 STDDCL; 3303 struct in6_addr myaddr, hisaddr; 3304 3305 #ifdef IPV6CP_MYIFID_DYN 3306 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3307 #else 3308 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3309 #endif 3310 3311 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3312 /* 3313 * If we don't have our address, this probably means our 3314 * interface doesn't want to talk IPv6 at all. (This could 3315 * be the case if somebody wants to speak only IPX, for 3316 * example.) Don't open IPv6CP in this case. 3317 */ 3318 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3319 /* XXX this message should go away */ 3320 if (debug) 3321 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3322 ifp->if_xname); 3323 return; 3324 } 3325 3326 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3327 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3328 sppp_open_event(&ipv6cp, sp); 3329 } 3330 3331 static void 3332 sppp_ipv6cp_close(struct sppp *sp) 3333 { 3334 sppp_close_event(&ipv6cp, sp); 3335 } 3336 3337 static void 3338 sppp_ipv6cp_TO(void *cookie) 3339 { 3340 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3341 } 3342 3343 /* 3344 * Analyze a configure request. Return true if it was agreeable, and 3345 * caused action sca, false if it has been rejected or nak'ed, and 3346 * caused action scn. (The return value is used to make the state 3347 * transition decision in the state automaton.) 3348 */ 3349 static int 3350 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3351 { 3352 u_char *buf, *r, *p, l, blen; 3353 struct ifnet *ifp = &sp->pp_if; 3354 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3355 struct in6_addr myaddr, desiredaddr, suggestaddr; 3356 int ifidcount; 3357 int type; 3358 int collision, nohisaddr; 3359 3360 len -= 4; 3361 origlen = len; 3362 /* 3363 * Make sure to allocate a buf that can at least hold a 3364 * conf-nak with an `address' option. We might need it below. 3365 */ 3366 blen = len < 6 ? 6 : len; 3367 buf = r = malloc (blen, M_TEMP, M_NOWAIT); 3368 if (! buf) 3369 return (0); 3370 3371 /* pass 1: see if we can recognize them */ 3372 if (debug) 3373 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3374 ifp->if_xname); 3375 p = (void *)(h + 1); 3376 ifidcount = 0; 3377 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3378 /* Sanity check option length */ 3379 if (l > len) { 3380 /* XXX just RXJ? */ 3381 addlog("%s: received malicious IPCPv6 option, " 3382 "dropping\n", ifp->if_xname); 3383 goto drop; 3384 } 3385 if (debug) 3386 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3387 switch (*p) { 3388 case IPV6CP_OPT_IFID: 3389 if (len >= 10 && l == 10 && ifidcount == 0) { 3390 /* correctly formed address option */ 3391 ifidcount++; 3392 continue; 3393 } 3394 if (debug) 3395 addlog(" [invalid]"); 3396 break; 3397 #ifdef notyet 3398 case IPV6CP_OPT_COMPRESSION: 3399 if (len >= 4 && l >= 4) { 3400 /* correctly formed compress option */ 3401 continue; 3402 } 3403 if (debug) 3404 addlog(" [invalid]"); 3405 break; 3406 #endif 3407 default: 3408 /* Others not supported. */ 3409 if (debug) 3410 addlog(" [rej]"); 3411 break; 3412 } 3413 if (rlen + l > blen) { 3414 if (debug) 3415 addlog(" [overflow]"); 3416 continue; 3417 } 3418 /* Add the option to rejected list. */ 3419 memcpy(r, p, l); 3420 r += l; 3421 rlen += l; 3422 } 3423 if (rlen) { 3424 if (debug) 3425 addlog(" send conf-rej\n"); 3426 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3427 goto end; 3428 } else if (debug) 3429 addlog("\n"); 3430 3431 /* pass 2: parse option values */ 3432 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3433 if (debug) 3434 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3435 ifp->if_xname); 3436 p = (void *)(h + 1); 3437 len = origlen; 3438 type = CONF_ACK; 3439 for (rlen = 0; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3440 if (debug) 3441 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3442 switch (*p) { 3443 #ifdef notyet 3444 case IPV6CP_OPT_COMPRESSION: 3445 continue; 3446 #endif 3447 case IPV6CP_OPT_IFID: 3448 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3449 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3450 collision = (memcmp(&desiredaddr.s6_addr[8], 3451 &myaddr.s6_addr[8], 8) == 0); 3452 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3453 3454 desiredaddr.s6_addr16[0] = htons(0xfe80); 3455 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3456 3457 if (!collision && !nohisaddr) { 3458 /* no collision, hisaddr known - Conf-Ack */ 3459 type = CONF_ACK; 3460 3461 if (debug) { 3462 addlog(" %s [%s]", 3463 ip6_sprintf(&desiredaddr), 3464 sppp_cp_type_name(type)); 3465 } 3466 continue; 3467 } 3468 3469 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3470 if (collision && nohisaddr) { 3471 /* collision, hisaddr unknown - Conf-Rej */ 3472 type = CONF_REJ; 3473 memset(&p[2], 0, 8); 3474 } else { 3475 /* 3476 * - no collision, hisaddr unknown, or 3477 * - collision, hisaddr known 3478 * Conf-Nak, suggest hisaddr 3479 */ 3480 type = CONF_NAK; 3481 sppp_suggest_ip6_addr(sp, &suggestaddr); 3482 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3483 } 3484 if (debug) 3485 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3486 sppp_cp_type_name(type)); 3487 break; 3488 } 3489 if (rlen + l > blen) { 3490 if (debug) 3491 addlog(" [overflow]"); 3492 continue; 3493 } 3494 /* Add the option to nak'ed list. */ 3495 memcpy(r, p, l); 3496 r += l; 3497 rlen += l; 3498 } 3499 3500 if (rlen == 0 && type == CONF_ACK) { 3501 if (debug) 3502 addlog(" send %s\n", sppp_cp_type_name(type)); 3503 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3504 } else { 3505 #ifdef notdef 3506 if (type == CONF_ACK) 3507 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3508 #endif 3509 3510 if (debug) { 3511 addlog(" send %s suggest %s\n", 3512 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3513 } 3514 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3515 } 3516 3517 end: 3518 free(buf, M_TEMP); 3519 return (rlen == 0); 3520 3521 drop: 3522 free(buf, M_TEMP); 3523 return -1; 3524 } 3525 3526 /* 3527 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3528 * negotiation. 3529 */ 3530 static void 3531 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3532 { 3533 u_char *buf, *p, l, blen; 3534 struct ifnet *ifp = &sp->pp_if; 3535 int debug = ifp->if_flags & IFF_DEBUG; 3536 3537 len -= 4; 3538 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3539 if (!buf) 3540 return; 3541 3542 if (debug) 3543 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3544 ifp->if_xname); 3545 3546 p = (void *)(h + 1); 3547 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3548 if (l > len) { 3549 /* XXX just RXJ? */ 3550 addlog("%s: received malicious IPCPv6 option, " 3551 "dropping\n", ifp->if_xname); 3552 goto drop; 3553 } 3554 if (debug) 3555 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3556 switch (*p) { 3557 case IPV6CP_OPT_IFID: 3558 /* 3559 * Peer doesn't grok address option. This is 3560 * bad. XXX Should we better give up here? 3561 */ 3562 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3563 break; 3564 #ifdef notyet 3565 case IPV6CP_OPT_COMPRESS: 3566 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3567 break; 3568 #endif 3569 } 3570 } 3571 if (debug) 3572 addlog("\n"); 3573 drop: 3574 free(buf, M_TEMP); 3575 return; 3576 } 3577 3578 /* 3579 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3580 * negotiation. 3581 */ 3582 static void 3583 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3584 { 3585 u_char *buf, *p, l, blen; 3586 struct ifnet *ifp = &sp->pp_if; 3587 int debug = ifp->if_flags & IFF_DEBUG; 3588 struct in6_addr suggestaddr; 3589 3590 len -= 4; 3591 buf = malloc (blen = len, M_TEMP, M_NOWAIT); 3592 if (!buf) 3593 return; 3594 3595 if (debug) 3596 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3597 ifp->if_xname); 3598 3599 p = (void *)(h + 1); 3600 for (; len > 1 && (l = p[1]) != 0; len -= l, p += l) { 3601 if (l > len) { 3602 /* XXX just RXJ? */ 3603 addlog("%s: received malicious IPCPv6 option, " 3604 "dropping\n", ifp->if_xname); 3605 goto drop; 3606 } 3607 if (debug) 3608 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3609 switch (*p) { 3610 case IPV6CP_OPT_IFID: 3611 /* 3612 * Peer doesn't like our local ifid. See 3613 * if we can do something for him. We'll drop 3614 * him our address then. 3615 */ 3616 if (len < 10 || l != 10) 3617 break; 3618 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3619 suggestaddr.s6_addr16[0] = htons(0xfe80); 3620 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3621 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3622 3623 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3624 if (debug) 3625 addlog(" [suggestaddr %s]", 3626 ip6_sprintf(&suggestaddr)); 3627 #ifdef IPV6CP_MYIFID_DYN 3628 /* 3629 * When doing dynamic address assignment, 3630 * we accept his offer. 3631 */ 3632 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3633 struct in6_addr lastsuggest; 3634 /* 3635 * If <suggested myaddr from peer> equals to 3636 * <hisaddr we have suggested last time>, 3637 * we have a collision. generate new random 3638 * ifid. 3639 */ 3640 sppp_suggest_ip6_addr(&lastsuggest); 3641 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3642 lastsuggest)) { 3643 if (debug) 3644 addlog(" [random]"); 3645 sppp_gen_ip6_addr(sp, &suggestaddr); 3646 } 3647 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3648 if (debug) 3649 addlog(" [agree]"); 3650 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3651 } 3652 #else 3653 /* 3654 * Since we do not do dynamic address assignment, 3655 * we ignore it and thus continue to negotiate 3656 * our already existing value. This can possibly 3657 * go into infinite request-reject loop. 3658 * 3659 * This is not likely because we normally use 3660 * ifid based on MAC-address. 3661 * If you have no ethernet card on the node, too bad. 3662 * XXX should we use fail_counter? 3663 */ 3664 #endif 3665 break; 3666 #ifdef notyet 3667 case IPV6CP_OPT_COMPRESS: 3668 /* 3669 * Peer wants different compression parameters. 3670 */ 3671 break; 3672 #endif 3673 } 3674 } 3675 if (debug) 3676 addlog("\n"); 3677 drop: 3678 free(buf, M_TEMP); 3679 return; 3680 } 3681 3682 static void 3683 sppp_ipv6cp_tlu(struct sppp *sp) 3684 { 3685 /* we are up - notify isdn daemon */ 3686 if (sp->pp_con) 3687 sp->pp_con(sp); 3688 } 3689 3690 static void 3691 sppp_ipv6cp_tld(struct sppp *sp) 3692 { 3693 } 3694 3695 static void 3696 sppp_ipv6cp_tls(struct sppp *sp) 3697 { 3698 /* indicate to LCP that it must stay alive */ 3699 sp->lcp.protos |= (1 << IDX_IPV6CP); 3700 } 3701 3702 static void 3703 sppp_ipv6cp_tlf(struct sppp *sp) 3704 { 3705 /* we no longer need LCP */ 3706 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3707 } 3708 3709 static void 3710 sppp_ipv6cp_scr(struct sppp *sp) 3711 { 3712 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3713 struct in6_addr ouraddr; 3714 int i = 0; 3715 3716 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3717 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3718 opt[i++] = IPV6CP_OPT_IFID; 3719 opt[i++] = 10; 3720 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3721 i += 8; 3722 } 3723 3724 #ifdef notyet 3725 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3726 opt[i++] = IPV6CP_OPT_COMPRESSION; 3727 opt[i++] = 4; 3728 opt[i++] = 0; /* TBD */ 3729 opt[i++] = 0; /* TBD */ 3730 /* variable length data may follow */ 3731 } 3732 #endif 3733 3734 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3735 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3736 } 3737 #else /*INET6*/ 3738 static void 3739 sppp_ipv6cp_init(struct sppp *sp) 3740 { 3741 } 3742 3743 static void 3744 sppp_ipv6cp_up(struct sppp *sp) 3745 { 3746 } 3747 3748 static void 3749 sppp_ipv6cp_down(struct sppp *sp) 3750 { 3751 } 3752 3753 static void 3754 sppp_ipv6cp_open(struct sppp *sp) 3755 { 3756 } 3757 3758 static void 3759 sppp_ipv6cp_close(struct sppp *sp) 3760 { 3761 } 3762 3763 static void 3764 sppp_ipv6cp_TO(void *sp) 3765 { 3766 } 3767 3768 static int 3769 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3770 int len) 3771 { 3772 return 0; 3773 } 3774 3775 static void 3776 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3777 int len) 3778 { 3779 } 3780 3781 static void 3782 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3783 int len) 3784 { 3785 } 3786 3787 static void 3788 sppp_ipv6cp_tlu(struct sppp *sp) 3789 { 3790 } 3791 3792 static void 3793 sppp_ipv6cp_tld(struct sppp *sp) 3794 { 3795 } 3796 3797 static void 3798 sppp_ipv6cp_tls(struct sppp *sp) 3799 { 3800 } 3801 3802 static void 3803 sppp_ipv6cp_tlf(struct sppp *sp) 3804 { 3805 } 3806 3807 static void 3808 sppp_ipv6cp_scr(struct sppp *sp) 3809 { 3810 } 3811 #endif /*INET6*/ 3812 3813 3814 /* 3815 *--------------------------------------------------------------------------* 3816 * * 3817 * The CHAP implementation. * 3818 * * 3819 *--------------------------------------------------------------------------* 3820 */ 3821 3822 /* 3823 * The authentication protocols don't employ a full-fledged state machine as 3824 * the control protocols do, since they do have Open and Close events, but 3825 * not Up and Down, nor are they explicitly terminated. Also, use of the 3826 * authentication protocols may be different in both directions (this makes 3827 * sense, think of a machine that never accepts incoming calls but only 3828 * calls out, it doesn't require the called party to authenticate itself). 3829 * 3830 * Our state machine for the local authentication protocol (we are requesting 3831 * the peer to authenticate) looks like: 3832 * 3833 * RCA- 3834 * +--------------------------------------------+ 3835 * V scn,tld| 3836 * +--------+ Close +---------+ RCA+ 3837 * | |<----------------------------------| |------+ 3838 * +--->| Closed | TO* | Opened | sca | 3839 * | | |-----+ +-------| |<-----+ 3840 * | +--------+ irc | | +---------+ 3841 * | ^ | | ^ 3842 * | | | | | 3843 * | | | | | 3844 * | TO-| | | | 3845 * | |tld TO+ V | | 3846 * | | +------->+ | | 3847 * | | | | | | 3848 * | +--------+ V | | 3849 * | | |<----+<--------------------+ | 3850 * | | Req- | scr | 3851 * | | Sent | | 3852 * | | | | 3853 * | +--------+ | 3854 * | RCA- | | RCA+ | 3855 * +------+ +------------------------------------------+ 3856 * scn,tld sca,irc,ict,tlu 3857 * 3858 * 3859 * with: 3860 * 3861 * Open: LCP reached authentication phase 3862 * Close: LCP reached terminate phase 3863 * 3864 * RCA+: received reply (pap-req, chap-response), acceptable 3865 * RCN: received reply (pap-req, chap-response), not acceptable 3866 * TO+: timeout with restart counter >= 0 3867 * TO-: timeout with restart counter < 0 3868 * TO*: reschedule timeout for CHAP 3869 * 3870 * scr: send request packet (none for PAP, chap-challenge) 3871 * sca: send ack packet (pap-ack, chap-success) 3872 * scn: send nak packet (pap-nak, chap-failure) 3873 * ict: initialize re-challenge timer (CHAP only) 3874 * 3875 * tlu: this-layer-up, LCP reaches network phase 3876 * tld: this-layer-down, LCP enters terminate phase 3877 * 3878 * Note that in CHAP mode, after sending a new challenge, while the state 3879 * automaton falls back into Req-Sent state, it doesn't signal a tld 3880 * event to LCP, so LCP remains in network phase. Only after not getting 3881 * any response (or after getting an unacceptable response), CHAP closes, 3882 * causing LCP to enter terminate phase. 3883 * 3884 * With PAP, there is no initial request that can be sent. The peer is 3885 * expected to send one based on the successful negotiation of PAP as 3886 * the authentication protocol during the LCP option negotiation. 3887 * 3888 * Incoming authentication protocol requests (remote requests 3889 * authentication, we are peer) don't employ a state machine at all, 3890 * they are simply answered. Some peers [Ascend P50 firmware rev 3891 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3892 * still in authentication phase (thereby violating the standard that 3893 * demands that these NCP packets are to be discarded), so we keep 3894 * track of the peer demanding us to authenticate, and only proceed to 3895 * phase network once we've seen a positive acknowledge for the 3896 * authentication. 3897 */ 3898 3899 /* 3900 * Handle incoming CHAP packets. 3901 */ 3902 void 3903 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3904 { 3905 STDDCL; 3906 struct lcp_header *h; 3907 int len, x; 3908 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3909 int value_len, name_len; 3910 MD5_CTX ctx; 3911 3912 len = m->m_pkthdr.len; 3913 if (len < 4) { 3914 if (debug) 3915 log(LOG_DEBUG, 3916 "%s: chap invalid packet length: %d bytes\n", 3917 ifp->if_xname, len); 3918 return; 3919 } 3920 h = mtod(m, struct lcp_header *); 3921 if (len > ntohs(h->len)) 3922 len = ntohs(h->len); 3923 3924 switch (h->type) { 3925 /* challenge, failure and success are his authproto */ 3926 case CHAP_CHALLENGE: 3927 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3928 /* can't do anything useful */ 3929 sp->pp_auth_failures++; 3930 printf("%s: chap input without my name and my secret being set\n", 3931 ifp->if_xname); 3932 break; 3933 } 3934 value = 1 + (u_char *)(h + 1); 3935 value_len = value[-1]; 3936 name = value + value_len; 3937 name_len = len - value_len - 5; 3938 if (name_len < 0) { 3939 if (debug) { 3940 log(LOG_DEBUG, 3941 "%s: chap corrupted challenge " 3942 "<%s id=0x%x len=%d", 3943 ifp->if_xname, 3944 sppp_auth_type_name(PPP_CHAP, h->type), 3945 h->ident, ntohs(h->len)); 3946 if (len > 4) 3947 sppp_print_bytes((u_char *)(h + 1), 3948 len - 4); 3949 addlog(">\n"); 3950 } 3951 break; 3952 } 3953 3954 if (debug) { 3955 log(LOG_DEBUG, 3956 "%s: chap input <%s id=0x%x len=%d name=", 3957 ifp->if_xname, 3958 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3959 ntohs(h->len)); 3960 sppp_print_string((char *) name, name_len); 3961 addlog(" value-size=%d value=", value_len); 3962 sppp_print_bytes(value, value_len); 3963 addlog(">\n"); 3964 } 3965 3966 /* Compute reply value. */ 3967 MD5Init(&ctx); 3968 MD5Update(&ctx, &h->ident, 1); 3969 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3970 MD5Update(&ctx, value, value_len); 3971 MD5Final(digest, &ctx); 3972 dsize = sizeof digest; 3973 3974 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3975 sizeof dsize, (const char *)&dsize, 3976 sizeof digest, digest, 3977 sp->myauth.name_len, 3978 sp->myauth.name, 3979 0); 3980 break; 3981 3982 case CHAP_SUCCESS: 3983 if (debug) { 3984 log(LOG_DEBUG, "%s: chap success", 3985 ifp->if_xname); 3986 if (len > 4) { 3987 addlog(": "); 3988 sppp_print_string((char *)(h + 1), len - 4); 3989 } 3990 addlog("\n"); 3991 } 3992 x = splnet(); 3993 sp->pp_auth_failures = 0; 3994 sp->pp_flags &= ~PP_NEEDAUTH; 3995 if (sp->myauth.proto == PPP_CHAP && 3996 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3997 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3998 /* 3999 * We are authenticator for CHAP but didn't 4000 * complete yet. Leave it to tlu to proceed 4001 * to network phase. 4002 */ 4003 splx(x); 4004 break; 4005 } 4006 splx(x); 4007 sppp_phase_network(sp); 4008 break; 4009 4010 case CHAP_FAILURE: 4011 x = splnet(); 4012 sp->pp_auth_failures++; 4013 splx(x); 4014 if (debug) { 4015 log(LOG_INFO, "%s: chap failure", 4016 ifp->if_xname); 4017 if (len > 4) { 4018 addlog(": "); 4019 sppp_print_string((char *)(h + 1), len - 4); 4020 } 4021 addlog("\n"); 4022 } else 4023 log(LOG_INFO, "%s: chap failure\n", 4024 ifp->if_xname); 4025 /* await LCP shutdown by authenticator */ 4026 break; 4027 4028 /* response is my authproto */ 4029 case CHAP_RESPONSE: 4030 if (sp->hisauth.secret == NULL) { 4031 /* can't do anything useful */ 4032 printf("%s: chap input without his secret being set\n", 4033 ifp->if_xname); 4034 break; 4035 } 4036 value = 1 + (u_char *)(h + 1); 4037 value_len = value[-1]; 4038 name = value + value_len; 4039 name_len = len - value_len - 5; 4040 if (name_len < 0) { 4041 if (debug) { 4042 log(LOG_DEBUG, 4043 "%s: chap corrupted response " 4044 "<%s id=0x%x len=%d", 4045 ifp->if_xname, 4046 sppp_auth_type_name(PPP_CHAP, h->type), 4047 h->ident, ntohs(h->len)); 4048 if (len > 4) 4049 sppp_print_bytes((u_char *)(h + 1), 4050 len - 4); 4051 addlog(">\n"); 4052 } 4053 break; 4054 } 4055 if (h->ident != sp->confid[IDX_CHAP]) { 4056 if (debug) 4057 log(LOG_DEBUG, 4058 "%s: chap dropping response for old ID " 4059 "(got %d, expected %d)\n", 4060 ifp->if_xname, 4061 h->ident, sp->confid[IDX_CHAP]); 4062 break; 4063 } 4064 if (sp->hisauth.name != NULL && 4065 (name_len != sp->hisauth.name_len 4066 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4067 log(LOG_INFO, "%s: chap response, his name ", 4068 ifp->if_xname); 4069 sppp_print_string(name, name_len); 4070 addlog(" != expected "); 4071 sppp_print_string(sp->hisauth.name, 4072 sp->hisauth.name_len); 4073 addlog("\n"); 4074 goto chap_failure; 4075 } 4076 if (debug) { 4077 log(LOG_DEBUG, "%s: chap input(%s) " 4078 "<%s id=0x%x len=%d name=", 4079 ifp->if_xname, 4080 sppp_state_name(sp->state[IDX_CHAP]), 4081 sppp_auth_type_name(PPP_CHAP, h->type), 4082 h->ident, ntohs(h->len)); 4083 sppp_print_string((char *)name, name_len); 4084 addlog(" value-size=%d value=", value_len); 4085 sppp_print_bytes(value, value_len); 4086 addlog(">\n"); 4087 } 4088 if (value_len != sizeof(sp->hisauth.challenge)) { 4089 if (debug) 4090 log(LOG_DEBUG, 4091 "%s: chap bad hash value length: " 4092 "%d bytes, should be %zu\n", 4093 ifp->if_xname, value_len, 4094 sizeof(sp->hisauth.challenge)); 4095 goto chap_failure; 4096 } 4097 4098 MD5Init(&ctx); 4099 MD5Update(&ctx, &h->ident, 1); 4100 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4101 MD5Update(&ctx, sp->hisauth.challenge, sizeof(sp->hisauth.challenge)); 4102 MD5Final(digest, &ctx); 4103 4104 #define FAILMSG "Failed..." 4105 #define SUCCMSG "Welcome!" 4106 4107 if (value_len != sizeof digest || 4108 memcmp(digest, value, value_len) != 0) { 4109 chap_failure: 4110 /* action scn, tld */ 4111 x = splnet(); 4112 sp->pp_auth_failures++; 4113 splx(x); 4114 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4115 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4116 0); 4117 chap.tld(sp); 4118 break; 4119 } 4120 sp->pp_auth_failures = 0; 4121 /* action sca, perhaps tlu */ 4122 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4123 sp->state[IDX_CHAP] == STATE_OPENED) 4124 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4125 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4126 0); 4127 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4128 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4129 chap.tlu(sp); 4130 } 4131 break; 4132 4133 default: 4134 /* Unknown CHAP packet type -- ignore. */ 4135 if (debug) { 4136 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4137 "<0x%x id=0x%xh len=%d", 4138 ifp->if_xname, 4139 sppp_state_name(sp->state[IDX_CHAP]), 4140 h->type, h->ident, ntohs(h->len)); 4141 if (len > 4) 4142 sppp_print_bytes((u_char *)(h + 1), len - 4); 4143 addlog(">\n"); 4144 } 4145 break; 4146 4147 } 4148 } 4149 4150 static void 4151 sppp_chap_init(struct sppp *sp) 4152 { 4153 /* Chap doesn't have STATE_INITIAL at all. */ 4154 sp->state[IDX_CHAP] = STATE_CLOSED; 4155 sp->fail_counter[IDX_CHAP] = 0; 4156 sp->pp_seq[IDX_CHAP] = 0; 4157 sp->pp_rseq[IDX_CHAP] = 0; 4158 callout_init(&sp->ch[IDX_CHAP], 0); 4159 } 4160 4161 static void 4162 sppp_chap_open(struct sppp *sp) 4163 { 4164 if (sp->hisauth.proto == PPP_CHAP && 4165 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4166 /* we are authenticator for CHAP, start it */ 4167 chap.scr(sp); 4168 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4169 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4170 } 4171 /* nothing to be done if we are peer, await a challenge */ 4172 } 4173 4174 static void 4175 sppp_chap_close(struct sppp *sp) 4176 { 4177 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4178 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4179 } 4180 4181 static void 4182 sppp_chap_TO(void *cookie) 4183 { 4184 struct sppp *sp = (struct sppp *)cookie; 4185 STDDCL; 4186 int s; 4187 4188 s = splnet(); 4189 if (debug) 4190 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4191 ifp->if_xname, 4192 sppp_state_name(sp->state[IDX_CHAP]), 4193 sp->rst_counter[IDX_CHAP]); 4194 4195 if (--sp->rst_counter[IDX_CHAP] < 0) 4196 /* TO- event */ 4197 switch (sp->state[IDX_CHAP]) { 4198 case STATE_REQ_SENT: 4199 chap.tld(sp); 4200 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4201 break; 4202 } 4203 else 4204 /* TO+ (or TO*) event */ 4205 switch (sp->state[IDX_CHAP]) { 4206 case STATE_OPENED: 4207 /* TO* event */ 4208 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4209 /* fall through */ 4210 case STATE_REQ_SENT: 4211 chap.scr(sp); 4212 /* sppp_cp_change_state() will restart the timer */ 4213 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4214 break; 4215 } 4216 4217 splx(s); 4218 } 4219 4220 static void 4221 sppp_chap_tlu(struct sppp *sp) 4222 { 4223 STDDCL; 4224 int i, x; 4225 4226 i = 0; 4227 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4228 4229 /* 4230 * Some broken CHAP implementations (Conware CoNet, firmware 4231 * 4.0.?) don't want to re-authenticate their CHAP once the 4232 * initial challenge-response exchange has taken place. 4233 * Provide for an option to avoid rechallenges. 4234 */ 4235 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4236 /* 4237 * Compute the re-challenge timeout. This will yield 4238 * a number between 300 and 810 seconds. 4239 */ 4240 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4241 4242 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4243 } 4244 4245 if (debug) { 4246 log(LOG_DEBUG, 4247 "%s: chap %s, ", 4248 ifp->if_xname, 4249 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4250 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4251 addlog("next re-challenge in %d seconds\n", i); 4252 else 4253 addlog("re-challenging supressed\n"); 4254 } 4255 4256 x = splnet(); 4257 sp->pp_auth_failures = 0; 4258 /* indicate to LCP that we need to be closed down */ 4259 sp->lcp.protos |= (1 << IDX_CHAP); 4260 4261 if (sp->pp_flags & PP_NEEDAUTH) { 4262 /* 4263 * Remote is authenticator, but his auth proto didn't 4264 * complete yet. Defer the transition to network 4265 * phase. 4266 */ 4267 splx(x); 4268 return; 4269 } 4270 splx(x); 4271 4272 /* 4273 * If we are already in phase network, we are done here. This 4274 * is the case if this is a dummy tlu event after a re-challenge. 4275 */ 4276 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4277 sppp_phase_network(sp); 4278 } 4279 4280 static void 4281 sppp_chap_tld(struct sppp *sp) 4282 { 4283 STDDCL; 4284 4285 if (debug) 4286 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4287 callout_stop(&sp->ch[IDX_CHAP]); 4288 sp->lcp.protos &= ~(1 << IDX_CHAP); 4289 4290 lcp.Close(sp); 4291 } 4292 4293 static void 4294 sppp_chap_scr(struct sppp *sp) 4295 { 4296 uint32_t *ch; 4297 u_char clen = 4 * sizeof(uint32_t); 4298 4299 if (sp->hisauth.name == NULL) { 4300 /* can't do anything useful */ 4301 printf("%s: chap starting without his name being set\n", 4302 sp->pp_if.if_xname); 4303 return; 4304 } 4305 4306 /* Compute random challenge. */ 4307 ch = (uint32_t *)sp->hisauth.challenge; 4308 cprng_strong(kern_cprng, ch, clen, 0); 4309 4310 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4311 4312 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4313 sizeof clen, (const char *)&clen, 4314 sizeof(sp->hisauth.challenge), sp->hisauth.challenge, 4315 0); 4316 } 4317 4318 /* 4319 *--------------------------------------------------------------------------* 4320 * * 4321 * The PAP implementation. * 4322 * * 4323 *--------------------------------------------------------------------------* 4324 */ 4325 /* 4326 * For PAP, we need to keep a little state also if we are the peer, not the 4327 * authenticator. This is since we don't get a request to authenticate, but 4328 * have to repeatedly authenticate ourself until we got a response (or the 4329 * retry counter is expired). 4330 */ 4331 4332 /* 4333 * Handle incoming PAP packets. */ 4334 static void 4335 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4336 { 4337 STDDCL; 4338 struct lcp_header *h; 4339 int len, x; 4340 u_char mlen; 4341 char *name, *secret; 4342 int name_len, secret_len; 4343 4344 /* 4345 * Malicious input might leave this uninitialized, so 4346 * init to an impossible value. 4347 */ 4348 secret_len = -1; 4349 4350 len = m->m_pkthdr.len; 4351 if (len < 5) { 4352 if (debug) 4353 log(LOG_DEBUG, 4354 "%s: pap invalid packet length: %d bytes\n", 4355 ifp->if_xname, len); 4356 return; 4357 } 4358 h = mtod(m, struct lcp_header *); 4359 if (len > ntohs(h->len)) 4360 len = ntohs(h->len); 4361 switch (h->type) { 4362 /* PAP request is my authproto */ 4363 case PAP_REQ: 4364 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4365 /* can't do anything useful */ 4366 printf("%s: pap request without his name and his secret being set\n", 4367 ifp->if_xname); 4368 break; 4369 } 4370 name = 1 + (u_char *)(h + 1); 4371 name_len = name[-1]; 4372 secret = name + name_len + 1; 4373 if (name_len > len - 6 || 4374 (secret_len = secret[-1]) > len - 6 - name_len) { 4375 if (debug) { 4376 log(LOG_DEBUG, "%s: pap corrupted input " 4377 "<%s id=0x%x len=%d", 4378 ifp->if_xname, 4379 sppp_auth_type_name(PPP_PAP, h->type), 4380 h->ident, ntohs(h->len)); 4381 if (len > 4) 4382 sppp_print_bytes((u_char *)(h + 1), 4383 len - 4); 4384 addlog(">\n"); 4385 } 4386 break; 4387 } 4388 if (debug) { 4389 log(LOG_DEBUG, "%s: pap input(%s) " 4390 "<%s id=0x%x len=%d name=", 4391 ifp->if_xname, 4392 sppp_state_name(sp->state[IDX_PAP]), 4393 sppp_auth_type_name(PPP_PAP, h->type), 4394 h->ident, ntohs(h->len)); 4395 sppp_print_string((char *)name, name_len); 4396 addlog(" secret="); 4397 sppp_print_string((char *)secret, secret_len); 4398 addlog(">\n"); 4399 } 4400 if (name_len != sp->hisauth.name_len || 4401 secret_len != sp->hisauth.secret_len || 4402 memcmp(name, sp->hisauth.name, name_len) != 0 || 4403 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4404 /* action scn, tld */ 4405 sp->pp_auth_failures++; 4406 mlen = sizeof(FAILMSG) - 1; 4407 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4408 sizeof mlen, (const char *)&mlen, 4409 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4410 0); 4411 pap.tld(sp); 4412 break; 4413 } 4414 /* action sca, perhaps tlu */ 4415 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4416 sp->state[IDX_PAP] == STATE_OPENED) { 4417 mlen = sizeof(SUCCMSG) - 1; 4418 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4419 sizeof mlen, (const char *)&mlen, 4420 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4421 0); 4422 } 4423 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4424 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4425 pap.tlu(sp); 4426 } 4427 break; 4428 4429 /* ack and nak are his authproto */ 4430 case PAP_ACK: 4431 callout_stop(&sp->pap_my_to_ch); 4432 if (debug) { 4433 log(LOG_DEBUG, "%s: pap success", 4434 ifp->if_xname); 4435 name = 1 + (u_char *)(h + 1); 4436 name_len = name[-1]; 4437 if (len > 5 && name_len < len+4) { 4438 addlog(": "); 4439 sppp_print_string(name, name_len); 4440 } 4441 addlog("\n"); 4442 } 4443 x = splnet(); 4444 sp->pp_auth_failures = 0; 4445 sp->pp_flags &= ~PP_NEEDAUTH; 4446 if (sp->myauth.proto == PPP_PAP && 4447 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4448 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4449 /* 4450 * We are authenticator for PAP but didn't 4451 * complete yet. Leave it to tlu to proceed 4452 * to network phase. 4453 */ 4454 splx(x); 4455 break; 4456 } 4457 splx(x); 4458 sppp_phase_network(sp); 4459 break; 4460 4461 case PAP_NAK: 4462 callout_stop(&sp->pap_my_to_ch); 4463 sp->pp_auth_failures++; 4464 if (debug) { 4465 log(LOG_INFO, "%s: pap failure", 4466 ifp->if_xname); 4467 name = 1 + (u_char *)(h + 1); 4468 name_len = name[-1]; 4469 if (len > 5 && name_len < len+4) { 4470 addlog(": "); 4471 sppp_print_string(name, name_len); 4472 } 4473 addlog("\n"); 4474 } else 4475 log(LOG_INFO, "%s: pap failure\n", 4476 ifp->if_xname); 4477 /* await LCP shutdown by authenticator */ 4478 break; 4479 4480 default: 4481 /* Unknown PAP packet type -- ignore. */ 4482 if (debug) { 4483 log(LOG_DEBUG, "%s: pap corrupted input " 4484 "<0x%x id=0x%x len=%d", 4485 ifp->if_xname, 4486 h->type, h->ident, ntohs(h->len)); 4487 if (len > 4) 4488 sppp_print_bytes((u_char *)(h + 1), len - 4); 4489 addlog(">\n"); 4490 } 4491 break; 4492 4493 } 4494 } 4495 4496 static void 4497 sppp_pap_init(struct sppp *sp) 4498 { 4499 /* PAP doesn't have STATE_INITIAL at all. */ 4500 sp->state[IDX_PAP] = STATE_CLOSED; 4501 sp->fail_counter[IDX_PAP] = 0; 4502 sp->pp_seq[IDX_PAP] = 0; 4503 sp->pp_rseq[IDX_PAP] = 0; 4504 callout_init(&sp->ch[IDX_PAP], 0); 4505 callout_init(&sp->pap_my_to_ch, 0); 4506 } 4507 4508 static void 4509 sppp_pap_open(struct sppp *sp) 4510 { 4511 if (sp->hisauth.proto == PPP_PAP && 4512 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4513 /* we are authenticator for PAP, start our timer */ 4514 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4515 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4516 } 4517 if (sp->myauth.proto == PPP_PAP) { 4518 /* we are peer, send a request, and start a timer */ 4519 pap.scr(sp); 4520 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4521 sppp_pap_my_TO, sp); 4522 } 4523 } 4524 4525 static void 4526 sppp_pap_close(struct sppp *sp) 4527 { 4528 if (sp->state[IDX_PAP] != STATE_CLOSED) 4529 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4530 } 4531 4532 /* 4533 * That's the timeout routine if we are authenticator. Since the 4534 * authenticator is basically passive in PAP, we can't do much here. 4535 */ 4536 static void 4537 sppp_pap_TO(void *cookie) 4538 { 4539 struct sppp *sp = (struct sppp *)cookie; 4540 STDDCL; 4541 int s; 4542 4543 s = splnet(); 4544 if (debug) 4545 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4546 ifp->if_xname, 4547 sppp_state_name(sp->state[IDX_PAP]), 4548 sp->rst_counter[IDX_PAP]); 4549 4550 if (--sp->rst_counter[IDX_PAP] < 0) 4551 /* TO- event */ 4552 switch (sp->state[IDX_PAP]) { 4553 case STATE_REQ_SENT: 4554 pap.tld(sp); 4555 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4556 break; 4557 } 4558 else 4559 /* TO+ event, not very much we could do */ 4560 switch (sp->state[IDX_PAP]) { 4561 case STATE_REQ_SENT: 4562 /* sppp_cp_change_state() will restart the timer */ 4563 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4564 break; 4565 } 4566 4567 splx(s); 4568 } 4569 4570 /* 4571 * That's the timeout handler if we are peer. Since the peer is active, 4572 * we need to retransmit our PAP request since it is apparently lost. 4573 * XXX We should impose a max counter. 4574 */ 4575 static void 4576 sppp_pap_my_TO(void *cookie) 4577 { 4578 struct sppp *sp = (struct sppp *)cookie; 4579 STDDCL; 4580 4581 if (debug) 4582 log(LOG_DEBUG, "%s: pap peer TO\n", 4583 ifp->if_xname); 4584 4585 pap.scr(sp); 4586 } 4587 4588 static void 4589 sppp_pap_tlu(struct sppp *sp) 4590 { 4591 STDDCL; 4592 int x; 4593 4594 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4595 4596 if (debug) 4597 log(LOG_DEBUG, "%s: %s tlu\n", 4598 ifp->if_xname, pap.name); 4599 4600 x = splnet(); 4601 sp->pp_auth_failures = 0; 4602 /* indicate to LCP that we need to be closed down */ 4603 sp->lcp.protos |= (1 << IDX_PAP); 4604 4605 if (sp->pp_flags & PP_NEEDAUTH) { 4606 /* 4607 * Remote is authenticator, but his auth proto didn't 4608 * complete yet. Defer the transition to network 4609 * phase. 4610 */ 4611 splx(x); 4612 return; 4613 } 4614 splx(x); 4615 sppp_phase_network(sp); 4616 } 4617 4618 static void 4619 sppp_pap_tld(struct sppp *sp) 4620 { 4621 STDDCL; 4622 4623 if (debug) 4624 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4625 callout_stop(&sp->ch[IDX_PAP]); 4626 callout_stop(&sp->pap_my_to_ch); 4627 sp->lcp.protos &= ~(1 << IDX_PAP); 4628 4629 lcp.Close(sp); 4630 } 4631 4632 static void 4633 sppp_pap_scr(struct sppp *sp) 4634 { 4635 u_char idlen, pwdlen; 4636 4637 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4638 /* can't do anything useful */ 4639 printf("%s: pap starting without my name and secret being set\n", 4640 sp->pp_if.if_xname); 4641 return; 4642 } 4643 4644 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4645 pwdlen = sp->myauth.secret_len; 4646 idlen = sp->myauth.name_len; 4647 4648 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4649 sizeof idlen, (const char *)&idlen, 4650 idlen, sp->myauth.name, 4651 sizeof pwdlen, (const char *)&pwdlen, 4652 pwdlen, sp->myauth.secret, 4653 0); 4654 } 4655 4656 /* 4657 * Random miscellaneous functions. 4658 */ 4659 4660 /* 4661 * Send a PAP or CHAP proto packet. 4662 * 4663 * Varadic function, each of the elements for the ellipsis is of type 4664 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4665 * mlen == 0. 4666 * NOTE: never declare variadic functions with types subject to type 4667 * promotion (i.e. u_char). This is asking for big trouble depending 4668 * on the architecture you are on... 4669 */ 4670 4671 static void 4672 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4673 unsigned int type, unsigned int id, 4674 ...) 4675 { 4676 STDDCL; 4677 struct lcp_header *lh; 4678 struct mbuf *m; 4679 u_char *p; 4680 int len; 4681 size_t pkthdrlen; 4682 unsigned int mlen; 4683 const char *msg; 4684 va_list ap; 4685 4686 MGETHDR(m, M_DONTWAIT, MT_DATA); 4687 if (! m) 4688 return; 4689 m_reset_rcvif(m); 4690 4691 if (sp->pp_flags & PP_NOFRAMING) { 4692 *mtod(m, uint16_t *) = htons(cp->proto); 4693 pkthdrlen = 2; 4694 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4695 } else { 4696 struct ppp_header *h; 4697 h = mtod(m, struct ppp_header *); 4698 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4699 h->control = PPP_UI; /* Unnumbered Info */ 4700 h->protocol = htons(cp->proto); 4701 pkthdrlen = PPP_HEADER_LEN; 4702 4703 lh = (struct lcp_header *)(h + 1); 4704 } 4705 4706 lh->type = type; 4707 lh->ident = id; 4708 p = (u_char *)(lh + 1); 4709 4710 va_start(ap, id); 4711 len = 0; 4712 4713 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4714 msg = va_arg(ap, const char *); 4715 len += mlen; 4716 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4717 va_end(ap); 4718 m_freem(m); 4719 return; 4720 } 4721 4722 memcpy(p, msg, mlen); 4723 p += mlen; 4724 } 4725 va_end(ap); 4726 4727 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4728 lh->len = htons(LCP_HEADER_LEN + len); 4729 4730 if (debug) { 4731 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4732 ifp->if_xname, cp->name, 4733 sppp_auth_type_name(cp->proto, lh->type), 4734 lh->ident, ntohs(lh->len)); 4735 if (len) 4736 sppp_print_bytes((u_char *)(lh + 1), len); 4737 addlog(">\n"); 4738 } 4739 if (IF_QFULL(&sp->pp_cpq)) { 4740 IF_DROP(&sp->pp_fastq); 4741 IF_DROP(&ifp->if_snd); 4742 m_freem(m); 4743 ++ifp->if_oerrors; 4744 return; 4745 } else 4746 IF_ENQUEUE(&sp->pp_cpq, m); 4747 if (! (ifp->if_flags & IFF_OACTIVE)) 4748 if_start_lock(ifp); 4749 ifp->if_obytes += m->m_pkthdr.len + 3; 4750 } 4751 4752 /* 4753 * Send keepalive packets, every 10 seconds. 4754 */ 4755 static void 4756 sppp_keepalive(void *dummy) 4757 { 4758 struct sppp *sp; 4759 int s; 4760 time_t now; 4761 4762 s = splnet(); 4763 now = time_uptime; 4764 for (sp=spppq; sp; sp=sp->pp_next) { 4765 struct ifnet *ifp = &sp->pp_if; 4766 4767 /* check idle timeout */ 4768 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4769 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4770 /* idle timeout is enabled for this interface */ 4771 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4772 if (ifp->if_flags & IFF_DEBUG) 4773 printf("%s: no activity for %lu seconds\n", 4774 sp->pp_if.if_xname, 4775 (unsigned long)(now-sp->pp_last_activity)); 4776 lcp.Close(sp); 4777 continue; 4778 } 4779 } 4780 4781 /* Keepalive mode disabled or channel down? */ 4782 if (! (sp->pp_flags & PP_KEEPALIVE) || 4783 ! (ifp->if_flags & IFF_RUNNING)) 4784 continue; 4785 4786 /* No keepalive in PPP mode if LCP not opened yet. */ 4787 if (! (sp->pp_flags & PP_CISCO) && 4788 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4789 continue; 4790 4791 /* No echo reply, but maybe user data passed through? */ 4792 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4793 sp->pp_alivecnt = 0; 4794 continue; 4795 } 4796 4797 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4798 /* No keepalive packets got. Stop the interface. */ 4799 if_down (ifp); 4800 IF_PURGE(&sp->pp_cpq); 4801 if (! (sp->pp_flags & PP_CISCO)) { 4802 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4803 ifp->if_xname); 4804 sp->pp_alivecnt = 0; 4805 4806 /* we are down, close all open protocols */ 4807 lcp.Close(sp); 4808 4809 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4810 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4811 4812 /* Close connection immediately, completition of this 4813 * will summon the magic needed to reestablish it. */ 4814 if (sp->pp_tlf) 4815 sp->pp_tlf(sp); 4816 continue; 4817 } 4818 } 4819 if (sp->pp_alivecnt < sp->pp_maxalive) 4820 ++sp->pp_alivecnt; 4821 if (sp->pp_flags & PP_CISCO) 4822 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4823 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4824 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4825 int32_t nmagic = htonl(sp->lcp.magic); 4826 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4827 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4828 sp->lcp.echoid, 4, &nmagic); 4829 } 4830 } 4831 splx(s); 4832 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4833 } 4834 4835 #ifdef INET 4836 /* 4837 * Get both IP addresses. 4838 */ 4839 static void 4840 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4841 { 4842 struct ifnet *ifp = &sp->pp_if; 4843 struct ifaddr *ifa; 4844 struct sockaddr_in *si, *sm; 4845 uint32_t ssrc, ddst; 4846 4847 sm = NULL; 4848 ssrc = ddst = 0; 4849 /* 4850 * Pick the first AF_INET address from the list, 4851 * aliases don't make any sense on a p2p link anyway. 4852 */ 4853 si = 0; 4854 IFADDR_READER_FOREACH(ifa, ifp) { 4855 if (ifa->ifa_addr->sa_family == AF_INET) { 4856 si = (struct sockaddr_in *)ifa->ifa_addr; 4857 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4858 if (si) 4859 break; 4860 } 4861 } 4862 if (ifa) { 4863 if (si && si->sin_addr.s_addr) { 4864 ssrc = si->sin_addr.s_addr; 4865 if (srcmask) 4866 *srcmask = ntohl(sm->sin_addr.s_addr); 4867 } 4868 4869 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4870 if (si && si->sin_addr.s_addr) 4871 ddst = si->sin_addr.s_addr; 4872 } 4873 4874 if (dst) *dst = ntohl(ddst); 4875 if (src) *src = ntohl(ssrc); 4876 } 4877 4878 /* 4879 * Set IP addresses. Must be called at splnet. 4880 * If an address is 0, leave it the way it is. 4881 */ 4882 static void 4883 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4884 { 4885 STDDCL; 4886 struct ifaddr *ifa; 4887 struct sockaddr_in *si, *dest; 4888 4889 /* 4890 * Pick the first AF_INET address from the list, 4891 * aliases don't make any sense on a p2p link anyway. 4892 */ 4893 4894 IFADDR_READER_FOREACH(ifa, ifp) { 4895 if (ifa->ifa_addr->sa_family == AF_INET) { 4896 si = (struct sockaddr_in *)ifa->ifa_addr; 4897 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4898 goto found; 4899 } 4900 } 4901 return; 4902 4903 found: 4904 { 4905 int error; 4906 struct sockaddr_in new_sin = *si; 4907 struct sockaddr_in new_dst = *dest; 4908 4909 if (myaddr != 0) 4910 new_sin.sin_addr.s_addr = htonl(myaddr); 4911 if (hisaddr != 0) { 4912 new_dst.sin_addr.s_addr = htonl(hisaddr); 4913 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) 4914 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4915 } 4916 4917 LIST_REMOVE(ifatoia(ifa), ia_hash); 4918 IN_ADDRHASH_WRITER_REMOVE(ifatoia(ifa)); 4919 #ifdef NET_MPSAFE 4920 pserialize_perform(in_ifaddrhash_psz); 4921 #endif 4922 IN_ADDRHASH_ENTRY_DESTROY(ifatoia(ifa)); 4923 4924 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 4925 4926 IN_ADDRHASH_ENTRY_INIT(ifatoia(ifa)); 4927 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ifatoia(ifa)->ia_addr.sin_addr.s_addr), 4928 ifatoia(ifa), ia_hash); 4929 IN_ADDRHASH_WRITER_INSERT_HEAD(ifatoia(ifa)); 4930 4931 if (debug && error) 4932 { 4933 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 4934 ifp->if_xname, __func__, error); 4935 } 4936 if (!error) { 4937 (void)pfil_run_hooks(if_pfil, 4938 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4939 } 4940 } 4941 } 4942 4943 /* 4944 * Clear IP addresses. Must be called at splnet. 4945 */ 4946 static void 4947 sppp_clear_ip_addrs(struct sppp *sp) 4948 { 4949 STDDCL; 4950 struct ifaddr *ifa; 4951 struct sockaddr_in *si, *dest; 4952 4953 uint32_t remote; 4954 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4955 remote = sp->ipcp.saved_hisaddr; 4956 else 4957 sppp_get_ip_addrs(sp, 0, &remote, 0); 4958 4959 /* 4960 * Pick the first AF_INET address from the list, 4961 * aliases don't make any sense on a p2p link anyway. 4962 */ 4963 4964 IFADDR_READER_FOREACH(ifa, ifp) { 4965 if (ifa->ifa_addr->sa_family == AF_INET) { 4966 si = (struct sockaddr_in *)ifa->ifa_addr; 4967 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4968 goto found; 4969 } 4970 } 4971 return; 4972 4973 found: 4974 { 4975 struct sockaddr_in new_sin = *si; 4976 struct sockaddr_in new_dst = *dest; 4977 int error; 4978 4979 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4980 new_sin.sin_addr.s_addr = 0; 4981 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4982 new_dst.sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4983 4984 LIST_REMOVE(ifatoia(ifa), ia_hash); 4985 IN_ADDRHASH_WRITER_REMOVE(ifatoia(ifa)); 4986 #ifdef NET_MPSAFE 4987 pserialize_perform(in_ifaddrhash_psz); 4988 #endif 4989 IN_ADDRHASH_ENTRY_DESTROY(ifatoia(ifa)); 4990 4991 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, &new_dst, 0); 4992 4993 IN_ADDRHASH_ENTRY_INIT(ifatoia(ifa)); 4994 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ifatoia(ifa)->ia_addr.sin_addr.s_addr), 4995 ifatoia(ifa), ia_hash); 4996 IN_ADDRHASH_WRITER_INSERT_HEAD(ifatoia(ifa)); 4997 4998 if (debug && error) 4999 { 5000 log(LOG_DEBUG, "%s: %s: in_ifinit failed, error=%d\n", 5001 ifp->if_xname, __func__, error); 5002 } 5003 if (!error) { 5004 (void)pfil_run_hooks(if_pfil, 5005 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 5006 } 5007 } 5008 } 5009 #endif 5010 5011 #ifdef INET6 5012 /* 5013 * Get both IPv6 addresses. 5014 */ 5015 static void 5016 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 5017 struct in6_addr *srcmask) 5018 { 5019 struct ifnet *ifp = &sp->pp_if; 5020 struct ifaddr *ifa; 5021 struct sockaddr_in6 *si, *sm; 5022 struct in6_addr ssrc, ddst; 5023 5024 sm = NULL; 5025 memset(&ssrc, 0, sizeof(ssrc)); 5026 memset(&ddst, 0, sizeof(ddst)); 5027 /* 5028 * Pick the first link-local AF_INET6 address from the list, 5029 * aliases don't make any sense on a p2p link anyway. 5030 */ 5031 si = 0; 5032 IFADDR_READER_FOREACH(ifa, ifp) 5033 if (ifa->ifa_addr->sa_family == AF_INET6) { 5034 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5035 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5036 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5037 break; 5038 } 5039 if (ifa) { 5040 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5041 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 5042 if (srcmask) { 5043 memcpy(srcmask, &sm->sin6_addr, 5044 sizeof(*srcmask)); 5045 } 5046 } 5047 5048 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5049 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5050 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 5051 } 5052 5053 if (dst) 5054 memcpy(dst, &ddst, sizeof(*dst)); 5055 if (src) 5056 memcpy(src, &ssrc, sizeof(*src)); 5057 } 5058 5059 #ifdef IPV6CP_MYIFID_DYN 5060 /* 5061 * Generate random ifid. 5062 */ 5063 static void 5064 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5065 { 5066 /* TBD */ 5067 } 5068 5069 /* 5070 * Set my IPv6 address. Must be called at splnet. 5071 */ 5072 static void 5073 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5074 { 5075 STDDCL; 5076 struct ifaddr *ifa; 5077 struct sockaddr_in6 *sin6; 5078 5079 /* 5080 * Pick the first link-local AF_INET6 address from the list, 5081 * aliases don't make any sense on a p2p link anyway. 5082 */ 5083 5084 sin6 = NULL; 5085 IFADDR_READER_FOREACH(ifa, ifp) 5086 { 5087 if (ifa->ifa_addr->sa_family == AF_INET6) 5088 { 5089 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5090 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5091 break; 5092 } 5093 } 5094 5095 if (ifa && sin6) 5096 { 5097 int error; 5098 struct sockaddr_in6 new_sin6 = *sin6; 5099 5100 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5101 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5102 if (debug && error) 5103 { 5104 log(LOG_DEBUG, "%s: %s: in6_ifinit failed, error=%d\n", 5105 ifp->if_xname, __func__, error); 5106 } 5107 if (!error) { 5108 (void)pfil_run_hooks(if_pfil, 5109 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5110 } 5111 } 5112 } 5113 #endif 5114 5115 /* 5116 * Suggest a candidate address to be used by peer. 5117 */ 5118 static void 5119 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5120 { 5121 struct in6_addr myaddr; 5122 struct timeval tv; 5123 5124 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5125 5126 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5127 microtime(&tv); 5128 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5129 myaddr.s6_addr[14] ^= 0xff; 5130 myaddr.s6_addr[15] ^= 0xff; 5131 } else { 5132 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5133 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5134 } 5135 if (suggest) 5136 memcpy(suggest, &myaddr, sizeof(myaddr)); 5137 } 5138 #endif /*INET6*/ 5139 5140 /* 5141 * Process ioctl requests specific to the PPP interface. 5142 * Permissions have already been checked. 5143 */ 5144 static int 5145 sppp_params(struct sppp *sp, u_long cmd, void *data) 5146 { 5147 switch (cmd) { 5148 case SPPPGETAUTHCFG: 5149 { 5150 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5151 int error; 5152 size_t len; 5153 5154 cfg->myauthflags = sp->myauth.flags; 5155 cfg->hisauthflags = sp->hisauth.flags; 5156 strlcpy(cfg->ifname, sp->pp_if.if_xname, sizeof(cfg->ifname)); 5157 cfg->hisauth = 0; 5158 if (sp->hisauth.proto) 5159 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5160 cfg->myauth = 0; 5161 if (sp->myauth.proto) 5162 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5163 if (cfg->myname_length == 0) { 5164 if (sp->myauth.name != NULL) 5165 cfg->myname_length = sp->myauth.name_len + 1; 5166 } else { 5167 if (sp->myauth.name == NULL) { 5168 cfg->myname_length = 0; 5169 } else { 5170 len = sp->myauth.name_len + 1; 5171 if (cfg->myname_length < len) 5172 return (ENAMETOOLONG); 5173 error = copyout(sp->myauth.name, cfg->myname, len); 5174 if (error) return error; 5175 } 5176 } 5177 if (cfg->hisname_length == 0) { 5178 if (sp->hisauth.name != NULL) 5179 cfg->hisname_length = sp->hisauth.name_len + 1; 5180 } else { 5181 if (sp->hisauth.name == NULL) { 5182 cfg->hisname_length = 0; 5183 } else { 5184 len = sp->hisauth.name_len + 1; 5185 if (cfg->hisname_length < len) 5186 return (ENAMETOOLONG); 5187 error = copyout(sp->hisauth.name, cfg->hisname, len); 5188 if (error) return error; 5189 } 5190 } 5191 } 5192 break; 5193 case SPPPSETAUTHCFG: 5194 { 5195 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5196 int error; 5197 5198 if (sp->myauth.name) { 5199 free(sp->myauth.name, M_DEVBUF); 5200 sp->myauth.name = NULL; 5201 } 5202 if (sp->myauth.secret) { 5203 free(sp->myauth.secret, M_DEVBUF); 5204 sp->myauth.secret = NULL; 5205 } 5206 if (sp->hisauth.name) { 5207 free(sp->hisauth.name, M_DEVBUF); 5208 sp->hisauth.name = NULL; 5209 } 5210 if (sp->hisauth.secret) { 5211 free(sp->hisauth.secret, M_DEVBUF); 5212 sp->hisauth.secret = NULL; 5213 } 5214 5215 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5216 if (cfg->hisname_length >= MCLBYTES) 5217 return (ENAMETOOLONG); 5218 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5219 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5220 if (error) { 5221 free(sp->hisauth.name, M_DEVBUF); 5222 sp->hisauth.name = NULL; 5223 return error; 5224 } 5225 sp->hisauth.name_len = cfg->hisname_length - 1; 5226 sp->hisauth.name[sp->hisauth.name_len] = 0; 5227 } 5228 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5229 if (cfg->hissecret_length >= MCLBYTES) 5230 return (ENAMETOOLONG); 5231 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5232 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5233 if (error) { 5234 free(sp->hisauth.secret, M_DEVBUF); 5235 sp->hisauth.secret = NULL; 5236 return error; 5237 } 5238 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5239 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5240 } 5241 if (cfg->myname != NULL && cfg->myname_length > 0) { 5242 if (cfg->myname_length >= MCLBYTES) 5243 return (ENAMETOOLONG); 5244 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5245 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5246 if (error) { 5247 free(sp->myauth.name, M_DEVBUF); 5248 sp->myauth.name = NULL; 5249 return error; 5250 } 5251 sp->myauth.name_len = cfg->myname_length - 1; 5252 sp->myauth.name[sp->myauth.name_len] = 0; 5253 } 5254 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5255 if (cfg->mysecret_length >= MCLBYTES) 5256 return (ENAMETOOLONG); 5257 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5258 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5259 if (error) { 5260 free(sp->myauth.secret, M_DEVBUF); 5261 sp->myauth.secret = NULL; 5262 return error; 5263 } 5264 sp->myauth.secret_len = cfg->mysecret_length - 1; 5265 sp->myauth.secret[sp->myauth.secret_len] = 0; 5266 } 5267 sp->myauth.flags = cfg->myauthflags; 5268 if (cfg->myauth) 5269 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5270 sp->hisauth.flags = cfg->hisauthflags; 5271 if (cfg->hisauth) 5272 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5273 sp->pp_auth_failures = 0; 5274 if (sp->hisauth.proto != 0) 5275 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5276 else 5277 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5278 } 5279 break; 5280 case SPPPGETLCPCFG: 5281 { 5282 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5283 lcpp->lcp_timeout = sp->lcp.timeout; 5284 } 5285 break; 5286 case SPPPSETLCPCFG: 5287 { 5288 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5289 sp->lcp.timeout = lcpp->lcp_timeout; 5290 } 5291 break; 5292 case SPPPGETSTATUS: 5293 { 5294 struct spppstatus *status = (struct spppstatus *)data; 5295 status->phase = sp->pp_phase; 5296 } 5297 break; 5298 case SPPPGETSTATUSNCP: 5299 { 5300 struct spppstatusncp *status = (struct spppstatusncp *)data; 5301 status->phase = sp->pp_phase; 5302 status->ncpup = sppp_ncp_check(sp); 5303 } 5304 break; 5305 case SPPPGETIDLETO: 5306 { 5307 struct spppidletimeout *to = (struct spppidletimeout *)data; 5308 to->idle_seconds = sp->pp_idle_timeout; 5309 } 5310 break; 5311 case SPPPSETIDLETO: 5312 { 5313 struct spppidletimeout *to = (struct spppidletimeout *)data; 5314 sp->pp_idle_timeout = to->idle_seconds; 5315 } 5316 break; 5317 case SPPPSETAUTHFAILURE: 5318 { 5319 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5320 sp->pp_max_auth_fail = afsettings->max_failures; 5321 sp->pp_auth_failures = 0; 5322 } 5323 break; 5324 case SPPPGETAUTHFAILURES: 5325 { 5326 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5327 stats->auth_failures = sp->pp_auth_failures; 5328 stats->max_failures = sp->pp_max_auth_fail; 5329 } 5330 break; 5331 case SPPPSETDNSOPTS: 5332 { 5333 struct spppdnssettings *req = (struct spppdnssettings *)data; 5334 sp->query_dns = req->query_dns & 3; 5335 } 5336 break; 5337 case SPPPGETDNSOPTS: 5338 { 5339 struct spppdnssettings *req = (struct spppdnssettings *)data; 5340 req->query_dns = sp->query_dns; 5341 } 5342 break; 5343 case SPPPGETDNSADDRS: 5344 { 5345 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5346 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5347 } 5348 break; 5349 case SPPPGETKEEPALIVE: 5350 { 5351 struct spppkeepalivesettings *settings = 5352 (struct spppkeepalivesettings*)data; 5353 settings->maxalive = sp->pp_maxalive; 5354 settings->max_noreceive = sp->pp_max_noreceive; 5355 } 5356 break; 5357 case SPPPSETKEEPALIVE: 5358 { 5359 struct spppkeepalivesettings *settings = 5360 (struct spppkeepalivesettings*)data; 5361 sp->pp_maxalive = settings->maxalive; 5362 sp->pp_max_noreceive = settings->max_noreceive; 5363 } 5364 break; 5365 #if defined(COMPAT_50) || defined(MODULAR) 5366 case __SPPPGETIDLETO50: 5367 { 5368 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5369 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5370 } 5371 break; 5372 case __SPPPSETIDLETO50: 5373 { 5374 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5375 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5376 } 5377 break; 5378 case __SPPPGETKEEPALIVE50: 5379 { 5380 struct spppkeepalivesettings50 *settings = 5381 (struct spppkeepalivesettings50*)data; 5382 settings->maxalive = sp->pp_maxalive; 5383 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5384 } 5385 break; 5386 case __SPPPSETKEEPALIVE50: 5387 { 5388 struct spppkeepalivesettings50 *settings = 5389 (struct spppkeepalivesettings50*)data; 5390 sp->pp_maxalive = settings->maxalive; 5391 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5392 } 5393 break; 5394 #endif /* COMPAT_50 || MODULAR */ 5395 default: 5396 return (EINVAL); 5397 } 5398 5399 return (0); 5400 } 5401 5402 static void 5403 sppp_phase_network(struct sppp *sp) 5404 { 5405 int i; 5406 uint32_t mask; 5407 5408 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 5409 5410 /* Notify NCPs now. */ 5411 for (i = 0; i < IDX_COUNT; i++) 5412 if ((cps[i])->flags & CP_NCP) 5413 (cps[i])->Open(sp); 5414 5415 /* Send Up events to all NCPs. */ 5416 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5417 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5418 (cps[i])->Up(sp); 5419 5420 /* if no NCP is starting, all this was in vain, close down */ 5421 sppp_lcp_check_and_close(sp); 5422 } 5423 5424 5425 static const char * 5426 sppp_cp_type_name(u_char type) 5427 { 5428 static char buf[12]; 5429 switch (type) { 5430 case CONF_REQ: return "conf-req"; 5431 case CONF_ACK: return "conf-ack"; 5432 case CONF_NAK: return "conf-nak"; 5433 case CONF_REJ: return "conf-rej"; 5434 case TERM_REQ: return "term-req"; 5435 case TERM_ACK: return "term-ack"; 5436 case CODE_REJ: return "code-rej"; 5437 case PROTO_REJ: return "proto-rej"; 5438 case ECHO_REQ: return "echo-req"; 5439 case ECHO_REPLY: return "echo-reply"; 5440 case DISC_REQ: return "discard-req"; 5441 } 5442 snprintf(buf, sizeof(buf), "0x%x", type); 5443 return buf; 5444 } 5445 5446 static const char * 5447 sppp_auth_type_name(u_short proto, u_char type) 5448 { 5449 static char buf[32]; 5450 const char *name; 5451 5452 switch (proto) { 5453 case PPP_CHAP: 5454 switch (type) { 5455 case CHAP_CHALLENGE: return "challenge"; 5456 case CHAP_RESPONSE: return "response"; 5457 case CHAP_SUCCESS: return "success"; 5458 case CHAP_FAILURE: return "failure"; 5459 default: name = "chap"; break; 5460 } 5461 break; 5462 5463 case PPP_PAP: 5464 switch (type) { 5465 case PAP_REQ: return "req"; 5466 case PAP_ACK: return "ack"; 5467 case PAP_NAK: return "nak"; 5468 default: name = "pap"; break; 5469 } 5470 break; 5471 5472 default: 5473 name = "bad"; 5474 break; 5475 } 5476 5477 snprintf(buf, sizeof(buf), "%s(%#x) %#x", name, proto, type); 5478 return buf; 5479 } 5480 5481 static const char * 5482 sppp_lcp_opt_name(u_char opt) 5483 { 5484 static char buf[12]; 5485 switch (opt) { 5486 case LCP_OPT_MRU: return "mru"; 5487 case LCP_OPT_ASYNC_MAP: return "async-map"; 5488 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5489 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5490 case LCP_OPT_MAGIC: return "magic"; 5491 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5492 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5493 } 5494 snprintf(buf, sizeof(buf), "0x%x", opt); 5495 return buf; 5496 } 5497 5498 static const char * 5499 sppp_ipcp_opt_name(u_char opt) 5500 { 5501 static char buf[12]; 5502 switch (opt) { 5503 case IPCP_OPT_ADDRESSES: return "addresses"; 5504 case IPCP_OPT_COMPRESSION: return "compression"; 5505 case IPCP_OPT_ADDRESS: return "address"; 5506 } 5507 snprintf(buf, sizeof(buf), "0x%x", opt); 5508 return buf; 5509 } 5510 5511 #ifdef INET6 5512 static const char * 5513 sppp_ipv6cp_opt_name(u_char opt) 5514 { 5515 static char buf[12]; 5516 switch (opt) { 5517 case IPV6CP_OPT_IFID: return "ifid"; 5518 case IPV6CP_OPT_COMPRESSION: return "compression"; 5519 } 5520 snprintf(buf, sizeof(buf), "0x%x", opt); 5521 return buf; 5522 } 5523 #endif 5524 5525 static const char * 5526 sppp_state_name(int state) 5527 { 5528 switch (state) { 5529 case STATE_INITIAL: return "initial"; 5530 case STATE_STARTING: return "starting"; 5531 case STATE_CLOSED: return "closed"; 5532 case STATE_STOPPED: return "stopped"; 5533 case STATE_CLOSING: return "closing"; 5534 case STATE_STOPPING: return "stopping"; 5535 case STATE_REQ_SENT: return "req-sent"; 5536 case STATE_ACK_RCVD: return "ack-rcvd"; 5537 case STATE_ACK_SENT: return "ack-sent"; 5538 case STATE_OPENED: return "opened"; 5539 } 5540 return "illegal"; 5541 } 5542 5543 static const char * 5544 sppp_phase_name(int phase) 5545 { 5546 switch (phase) { 5547 case SPPP_PHASE_DEAD: return "dead"; 5548 case SPPP_PHASE_ESTABLISH: return "establish"; 5549 case SPPP_PHASE_TERMINATE: return "terminate"; 5550 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5551 case SPPP_PHASE_NETWORK: return "network"; 5552 } 5553 return "illegal"; 5554 } 5555 5556 static const char * 5557 sppp_proto_name(u_short proto) 5558 { 5559 static char buf[12]; 5560 switch (proto) { 5561 case PPP_LCP: return "lcp"; 5562 case PPP_IPCP: return "ipcp"; 5563 case PPP_PAP: return "pap"; 5564 case PPP_CHAP: return "chap"; 5565 case PPP_IPV6CP: return "ipv6cp"; 5566 } 5567 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5568 return buf; 5569 } 5570 5571 static void 5572 sppp_print_bytes(const u_char *p, u_short len) 5573 { 5574 addlog(" %02x", *p++); 5575 while (--len > 0) 5576 addlog("-%02x", *p++); 5577 } 5578 5579 static void 5580 sppp_print_string(const char *p, u_short len) 5581 { 5582 u_char c; 5583 5584 while (len-- > 0) { 5585 c = *p++; 5586 /* 5587 * Print only ASCII chars directly. RFC 1994 recommends 5588 * using only them, but we don't rely on it. */ 5589 if (c < ' ' || c > '~') 5590 addlog("\\x%x", c); 5591 else 5592 addlog("%c", c); 5593 } 5594 } 5595 5596 static const char * 5597 sppp_dotted_quad(uint32_t addr) 5598 { 5599 static char s[16]; 5600 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5601 (int)((addr >> 24) & 0xff), 5602 (int)((addr >> 16) & 0xff), 5603 (int)((addr >> 8) & 0xff), 5604 (int)(addr & 0xff)); 5605 return s; 5606 } 5607 5608 /* a dummy, used to drop uninteresting events */ 5609 static void 5610 sppp_null(struct sppp *unused) 5611 { 5612 /* do just nothing */ 5613 } 5614 /* 5615 * This file is large. Tell emacs to highlight it nevertheless. 5616 * 5617 * Local Variables: 5618 * hilit-auto-highlight-maxout: 120000 5619 * End: 5620 */ 5621 5622 /* 5623 * Module glue 5624 */ 5625 MODULE(MODULE_CLASS_MISC, sppp_subr, NULL); 5626 5627 static int 5628 sppp_subr_modcmd(modcmd_t cmd, void *arg) 5629 { 5630 switch (cmd) { 5631 case MODULE_CMD_INIT: 5632 case MODULE_CMD_FINI: 5633 return 0; 5634 case MODULE_CMD_STAT: 5635 case MODULE_CMD_AUTOUNLOAD: 5636 default: 5637 return ENOTTY; 5638 } 5639 } 5640 5641
Indexes created Fri Sep 26 08:10:20 GMT 2025