if_spppsubr.c revision 1.70
1 /* $NetBSD: if_spppsubr.c,v 1.70 2003/10/02 01:27:20 itojun 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 1.70 2003/10/02 01:27:20 itojun Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_ns.h" 50 51 #include <sys/param.h> 52 #include <sys/proc.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/sockio.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/callout.h> 61 #include <sys/md5.h> 62 #include <sys/inttypes.h> 63 64 #include <net/if.h> 65 #include <net/netisr.h> 66 #include <net/if_types.h> 67 #include <net/route.h> 68 #include <net/ppp_defs.h> 69 70 #include <machine/stdarg.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_systm.h> 74 #include <netinet/in_var.h> 75 #ifdef INET 76 #include <netinet/ip.h> 77 #include <netinet/tcp.h> 78 #endif 79 #include <net/ethertypes.h> 80 81 #ifdef IPX 82 #include <netipx/ipx.h> 83 #include <netipx/ipx_if.h> 84 #endif 85 86 #ifdef NS 87 #include <netns/ns.h> 88 #include <netns/ns_if.h> 89 #endif 90 91 #ifdef ISO 92 #include <netiso/argo_debug.h> 93 #include <netiso/iso.h> 94 #include <netiso/iso_var.h> 95 #include <netiso/iso_snpac.h> 96 #endif 97 98 #include <net/if_sppp.h> 99 #include <net/if_spppvar.h> 100 101 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 102 #define LOOPALIVECNT 3 /* loopback detection tries */ 103 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 104 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 105 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 106 107 /* 108 * Interface flags that can be set in an ifconfig command. 109 * 110 * Setting link0 will make the link passive, i.e. it will be marked 111 * as being administrative openable, but won't be opened to begin 112 * with. Incoming calls will be answered, or subsequent calls with 113 * -link1 will cause the administrative open of the LCP layer. 114 * 115 * Setting link1 will cause the link to auto-dial only as packets 116 * arrive to be sent. 117 * 118 * Setting IFF_DEBUG will syslog the option negotiation and state 119 * transitions at level kern.debug. Note: all logs consistently look 120 * like 121 * 122 * <if-name><unit>: <proto-name> <additional info...> 123 * 124 * with <if-name><unit> being something like "bppp0", and <proto-name> 125 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 126 */ 127 128 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 129 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 130 131 #define CONF_REQ 1 /* PPP configure request */ 132 #define CONF_ACK 2 /* PPP configure acknowledge */ 133 #define CONF_NAK 3 /* PPP configure negative ack */ 134 #define CONF_REJ 4 /* PPP configure reject */ 135 #define TERM_REQ 5 /* PPP terminate request */ 136 #define TERM_ACK 6 /* PPP terminate acknowledge */ 137 #define CODE_REJ 7 /* PPP code reject */ 138 #define PROTO_REJ 8 /* PPP protocol reject */ 139 #define ECHO_REQ 9 /* PPP echo request */ 140 #define ECHO_REPLY 10 /* PPP echo reply */ 141 #define DISC_REQ 11 /* PPP discard request */ 142 143 #define LCP_OPT_MRU 1 /* maximum receive unit */ 144 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 145 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 146 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 147 #define LCP_OPT_MAGIC 5 /* magic number */ 148 #define LCP_OPT_RESERVED 6 /* reserved */ 149 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 150 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 151 152 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 153 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 154 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 155 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 156 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 157 158 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 159 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 160 161 #define PAP_REQ 1 /* PAP name/password request */ 162 #define PAP_ACK 2 /* PAP acknowledge */ 163 #define PAP_NAK 3 /* PAP fail */ 164 165 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 166 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 167 #define CHAP_SUCCESS 3 /* CHAP response ok */ 168 #define CHAP_FAILURE 4 /* CHAP response failed */ 169 170 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 171 172 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 173 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 174 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 175 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 176 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 177 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 178 179 /* states are named and numbered according to RFC 1661 */ 180 #define STATE_INITIAL 0 181 #define STATE_STARTING 1 182 #define STATE_CLOSED 2 183 #define STATE_STOPPED 3 184 #define STATE_CLOSING 4 185 #define STATE_STOPPING 5 186 #define STATE_REQ_SENT 6 187 #define STATE_ACK_RCVD 7 188 #define STATE_ACK_SENT 8 189 #define STATE_OPENED 9 190 191 struct ppp_header { 192 u_int8_t address; 193 u_int8_t control; 194 u_int16_t protocol; 195 } __attribute__((__packed__)); 196 #define PPP_HEADER_LEN sizeof (struct ppp_header) 197 198 struct lcp_header { 199 u_int8_t type; 200 u_int8_t ident; 201 u_int16_t len; 202 } __attribute__((__packed__)); 203 #define LCP_HEADER_LEN sizeof (struct lcp_header) 204 205 struct cisco_packet { 206 u_int32_t type; 207 u_int32_t par1; 208 u_int32_t par2; 209 u_int16_t rel; 210 u_int16_t time0; 211 u_int16_t time1; 212 } __attribute__((__packed__)); 213 #define CISCO_PACKET_LEN 18 214 215 /* 216 * We follow the spelling and capitalization of RFC 1661 here, to make 217 * it easier comparing with the standard. Please refer to this RFC in 218 * case you can't make sense out of these abbreviation; it will also 219 * explain the semantics related to the various events and actions. 220 */ 221 struct cp { 222 u_short proto; /* PPP control protocol number */ 223 u_char protoidx; /* index into state table in struct sppp */ 224 u_char flags; 225 #define CP_LCP 0x01 /* this is the LCP */ 226 #define CP_AUTH 0x02 /* this is an authentication protocol */ 227 #define CP_NCP 0x04 /* this is a NCP */ 228 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 229 const char *name; /* name of this control protocol */ 230 /* event handlers */ 231 void (*Up)(struct sppp *sp); 232 void (*Down)(struct sppp *sp); 233 void (*Open)(struct sppp *sp); 234 void (*Close)(struct sppp *sp); 235 void (*TO)(void *sp); 236 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 237 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 239 /* actions */ 240 void (*tlu)(struct sppp *sp); 241 void (*tld)(struct sppp *sp); 242 void (*tls)(struct sppp *sp); 243 void (*tlf)(struct sppp *sp); 244 void (*scr)(struct sppp *sp); 245 }; 246 247 static struct sppp *spppq; 248 static struct callout keepalive_ch; 249 250 #ifdef INET 251 /* 252 * The following disgusting hack gets around the problem that IP TOS 253 * can't be set yet. We want to put "interactive" traffic on a high 254 * priority queue. To decide if traffic is interactive, we check that 255 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 256 * 257 * XXX is this really still necessary? - joerg - 258 */ 259 static u_short interactive_ports[8] = { 260 0, 513, 0, 0, 261 0, 21, 0, 23, 262 }; 263 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 264 #endif 265 266 /* almost every function needs these */ 267 #define STDDCL \ 268 struct ifnet *ifp = &sp->pp_if; \ 269 int debug = ifp->if_flags & IFF_DEBUG 270 271 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 272 struct sockaddr *dst, struct rtentry *rt); 273 274 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 275 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 276 277 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 278 struct mbuf *m); 279 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 280 u_char ident, u_short len, void *data); 281 /* static void sppp_cp_timeout(void *arg); */ 282 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 283 int newstate); 284 static void sppp_auth_send(const struct cp *cp, 285 struct sppp *sp, unsigned int type, unsigned int id, 286 ...); 287 288 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 289 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 293 294 static void sppp_null(struct sppp *sp); 295 296 static void sppp_lcp_init(struct sppp *sp); 297 static void sppp_lcp_up(struct sppp *sp); 298 static void sppp_lcp_down(struct sppp *sp); 299 static void sppp_lcp_open(struct sppp *sp); 300 static void sppp_lcp_close(struct sppp *sp); 301 static void sppp_lcp_TO(void *sp); 302 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 303 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_tlu(struct sppp *sp); 306 static void sppp_lcp_tld(struct sppp *sp); 307 static void sppp_lcp_tls(struct sppp *sp); 308 static void sppp_lcp_tlf(struct sppp *sp); 309 static void sppp_lcp_scr(struct sppp *sp); 310 static void sppp_lcp_check_and_close(struct sppp *sp); 311 static int sppp_ncp_check(struct sppp *sp); 312 313 static void sppp_ipcp_init(struct sppp *sp); 314 static void sppp_ipcp_up(struct sppp *sp); 315 static void sppp_ipcp_down(struct sppp *sp); 316 static void sppp_ipcp_open(struct sppp *sp); 317 static void sppp_ipcp_close(struct sppp *sp); 318 static void sppp_ipcp_TO(void *sp); 319 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 320 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_tlu(struct sppp *sp); 323 static void sppp_ipcp_tld(struct sppp *sp); 324 static void sppp_ipcp_tls(struct sppp *sp); 325 static void sppp_ipcp_tlf(struct sppp *sp); 326 static void sppp_ipcp_scr(struct sppp *sp); 327 328 static void sppp_ipv6cp_init(struct sppp *sp); 329 static void sppp_ipv6cp_up(struct sppp *sp); 330 static void sppp_ipv6cp_down(struct sppp *sp); 331 static void sppp_ipv6cp_open(struct sppp *sp); 332 static void sppp_ipv6cp_close(struct sppp *sp); 333 static void sppp_ipv6cp_TO(void *sp); 334 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 335 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_tlu(struct sppp *sp); 338 static void sppp_ipv6cp_tld(struct sppp *sp); 339 static void sppp_ipv6cp_tls(struct sppp *sp); 340 static void sppp_ipv6cp_tlf(struct sppp *sp); 341 static void sppp_ipv6cp_scr(struct sppp *sp); 342 343 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 344 static void sppp_pap_init(struct sppp *sp); 345 static void sppp_pap_open(struct sppp *sp); 346 static void sppp_pap_close(struct sppp *sp); 347 static void sppp_pap_TO(void *sp); 348 static void sppp_pap_my_TO(void *sp); 349 static void sppp_pap_tlu(struct sppp *sp); 350 static void sppp_pap_tld(struct sppp *sp); 351 static void sppp_pap_scr(struct sppp *sp); 352 353 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 354 static void sppp_chap_init(struct sppp *sp); 355 static void sppp_chap_open(struct sppp *sp); 356 static void sppp_chap_close(struct sppp *sp); 357 static void sppp_chap_TO(void *sp); 358 static void sppp_chap_tlu(struct sppp *sp); 359 static void sppp_chap_tld(struct sppp *sp); 360 static void sppp_chap_scr(struct sppp *sp); 361 362 static const char *sppp_auth_type_name(u_short proto, u_char type); 363 static const char *sppp_cp_type_name(u_char type); 364 static const char *sppp_dotted_quad(u_int32_t addr); 365 static const char *sppp_ipcp_opt_name(u_char opt); 366 #ifdef INET6 367 static const char *sppp_ipv6cp_opt_name(u_char opt); 368 #endif 369 static const char *sppp_lcp_opt_name(u_char opt); 370 static const char *sppp_phase_name(int phase); 371 static const char *sppp_proto_name(u_short proto); 372 static const char *sppp_state_name(int state); 373 static int sppp_params(struct sppp *sp, int cmd, void *data); 374 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 375 u_int32_t *srcmask); 376 static void sppp_keepalive(void *dummy); 377 static void sppp_phase_network(struct sppp *sp); 378 static void sppp_print_bytes(const u_char *p, u_short len); 379 static void sppp_print_string(const char *p, u_short len); 380 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 381 static void sppp_clear_ip_addrs(struct sppp *sp); 382 #ifdef INET6 383 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 384 struct in6_addr *dst, struct in6_addr *srcmask); 385 #ifdef IPV6CP_MYIFID_DYN 386 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 387 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 388 #endif 389 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 390 #endif 391 392 /* our control protocol descriptors */ 393 static const struct cp lcp = { 394 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 395 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 396 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 397 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 398 sppp_lcp_scr 399 }; 400 401 static const struct cp ipcp = { 402 PPP_IPCP, IDX_IPCP, 403 #ifdef INET 404 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 405 #else 406 0, 407 #endif 408 "ipcp", 409 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 410 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 411 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 412 sppp_ipcp_scr 413 }; 414 415 static const struct cp ipv6cp = { 416 PPP_IPV6CP, IDX_IPV6CP, 417 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 418 CP_NCP, 419 #else 420 0, 421 #endif 422 "ipv6cp", 423 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 424 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 425 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 426 sppp_ipv6cp_scr 427 }; 428 429 static const struct cp pap = { 430 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 431 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 432 sppp_pap_TO, 0, 0, 0, 433 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 434 sppp_pap_scr 435 }; 436 437 static const struct cp chap = { 438 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 439 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 440 sppp_chap_TO, 0, 0, 0, 441 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 442 sppp_chap_scr 443 }; 444 445 static const struct cp *cps[IDX_COUNT] = { 446 &lcp, /* IDX_LCP */ 447 &ipcp, /* IDX_IPCP */ 448 &ipv6cp, /* IDX_IPV6CP */ 449 &pap, /* IDX_PAP */ 450 &chap, /* IDX_CHAP */ 451 }; 452 453 454 /* 455 * Exported functions, comprising our interface to the lower layer. 456 */ 457 458 /* 459 * Process the received packet. 460 */ 461 void 462 sppp_input(struct ifnet *ifp, struct mbuf *m) 463 { 464 struct ppp_header *h = NULL; 465 struct ifqueue *inq = 0; 466 u_int16_t protocol; 467 int s; 468 struct sppp *sp = (struct sppp *)ifp; 469 int debug = ifp->if_flags & IFF_DEBUG; 470 471 if (ifp->if_flags & IFF_UP) { 472 /* Count received bytes, add hardware framing */ 473 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 474 /* Note time of last receive */ 475 sp->pp_last_receive = mono_time.tv_sec; 476 } 477 478 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 479 /* Too small packet, drop it. */ 480 if (debug) 481 log(LOG_DEBUG, 482 "%s: input packet is too small, %d bytes\n", 483 ifp->if_xname, m->m_pkthdr.len); 484 drop: 485 ++ifp->if_ierrors; 486 ++ifp->if_iqdrops; 487 m_freem(m); 488 return; 489 } 490 491 if (sp->pp_flags & PP_NOFRAMING) { 492 memcpy(&protocol, mtod(m, void *), 2); 493 protocol = ntohs(protocol); 494 m_adj(m, 2); 495 } else { 496 497 /* Get PPP header. */ 498 h = mtod(m, struct ppp_header *); 499 m_adj(m, PPP_HEADER_LEN); 500 501 switch (h->address) { 502 case PPP_ALLSTATIONS: 503 if (h->control != PPP_UI) 504 goto invalid; 505 if (sp->pp_flags & PP_CISCO) { 506 if (debug) 507 log(LOG_DEBUG, 508 "%s: PPP packet in Cisco mode " 509 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 510 ifp->if_xname, 511 h->address, h->control, ntohs(h->protocol)); 512 goto drop; 513 } 514 break; 515 case CISCO_MULTICAST: 516 case CISCO_UNICAST: 517 /* Don't check the control field here (RFC 1547). */ 518 if (! (sp->pp_flags & PP_CISCO)) { 519 if (debug) 520 log(LOG_DEBUG, 521 "%s: Cisco packet in PPP mode " 522 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 523 ifp->if_xname, 524 h->address, h->control, ntohs(h->protocol)); 525 goto drop; 526 } 527 switch (ntohs(h->protocol)) { 528 default: 529 ++ifp->if_noproto; 530 goto invalid; 531 case CISCO_KEEPALIVE: 532 sppp_cisco_input((struct sppp *) ifp, m); 533 m_freem(m); 534 return; 535 #ifdef INET 536 case ETHERTYPE_IP: 537 schednetisr(NETISR_IP); 538 inq = &ipintrq; 539 break; 540 #endif 541 #ifdef INET6 542 case ETHERTYPE_IPV6: 543 schednetisr(NETISR_IPV6); 544 inq = &ip6intrq; 545 break; 546 #endif 547 #ifdef IPX 548 case ETHERTYPE_IPX: 549 schednetisr(NETISR_IPX); 550 inq = &ipxintrq; 551 break; 552 #endif 553 #ifdef NS 554 case ETHERTYPE_NS: 555 schednetisr(NETISR_NS); 556 inq = &nsintrq; 557 break; 558 #endif 559 } 560 goto queue_pkt; 561 default: /* Invalid PPP packet. */ 562 invalid: 563 if (debug) 564 log(LOG_DEBUG, 565 "%s: invalid input packet " 566 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 567 ifp->if_xname, 568 h->address, h->control, ntohs(h->protocol)); 569 goto drop; 570 } 571 protocol = ntohs(h->protocol); 572 } 573 574 switch (protocol) { 575 default: 576 if (sp->state[IDX_LCP] == STATE_OPENED) { 577 u_int16_t prot = htons(protocol); 578 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 579 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 580 &prot); 581 } 582 if (debug) 583 log(LOG_DEBUG, 584 "%s: invalid input protocol " 585 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 586 ++ifp->if_noproto; 587 goto drop; 588 case PPP_LCP: 589 sppp_cp_input(&lcp, sp, m); 590 m_freem(m); 591 return; 592 case PPP_PAP: 593 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 594 sppp_pap_input(sp, m); 595 m_freem(m); 596 return; 597 case PPP_CHAP: 598 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 599 sppp_chap_input(sp, m); 600 m_freem(m); 601 return; 602 #ifdef INET 603 case PPP_IPCP: 604 if (sp->pp_phase == SPPP_PHASE_NETWORK) 605 sppp_cp_input(&ipcp, sp, m); 606 m_freem(m); 607 return; 608 case PPP_IP: 609 if (sp->state[IDX_IPCP] == STATE_OPENED) { 610 schednetisr(NETISR_IP); 611 inq = &ipintrq; 612 sp->pp_last_activity = mono_time.tv_sec; 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 schednetisr(NETISR_IPV6); 626 inq = &ip6intrq; 627 sp->pp_last_activity = mono_time.tv_sec; 628 } 629 break; 630 #endif 631 #ifdef IPX 632 case PPP_IPX: 633 /* IPX IPXCP not implemented yet */ 634 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 635 schednetisr(NETISR_IPX); 636 inq = &ipxintrq; 637 } 638 break; 639 #endif 640 #ifdef NS 641 case PPP_XNS: 642 /* XNS IDPCP not implemented yet */ 643 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 644 schednetisr(NETISR_NS); 645 inq = &nsintrq; 646 } 647 break; 648 #endif 649 #ifdef ISO 650 case PPP_ISO: 651 /* OSI NLCP not implemented yet */ 652 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 653 schednetisr(NETISR_ISO); 654 inq = &clnlintrq; 655 } 656 break; 657 #endif 658 } 659 660 queue_pkt: 661 if (! (ifp->if_flags & IFF_UP) || ! inq) 662 goto drop; 663 664 /* Check queue. */ 665 s = splnet(); 666 if (IF_QFULL(inq)) { 667 /* Queue overflow. */ 668 IF_DROP(inq); 669 splx(s); 670 if (debug) 671 log(LOG_DEBUG, "%s: protocol queue overflow\n", 672 ifp->if_xname); 673 goto drop; 674 } 675 IF_ENQUEUE(inq, m); 676 splx(s); 677 } 678 679 /* 680 * Enqueue transmit packet. 681 */ 682 static int 683 sppp_output(struct ifnet *ifp, struct mbuf *m, 684 struct sockaddr *dst, struct rtentry *rt) 685 { 686 struct sppp *sp = (struct sppp *) ifp; 687 struct ppp_header *h = NULL; 688 struct ifqueue *ifq = NULL; /* XXX */ 689 int s, len, rv = 0; 690 u_int16_t protocol; 691 ALTQ_DECL(struct altq_pktattr pktattr;) 692 693 s = splnet(); 694 695 sp->pp_last_activity = mono_time.tv_sec; 696 697 if ((ifp->if_flags & IFF_UP) == 0 || 698 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 699 m_freem(m); 700 splx(s); 701 return (ENETDOWN); 702 } 703 704 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 705 /* 706 * Interface is not yet running, but auto-dial. Need 707 * to start LCP for it. 708 */ 709 ifp->if_flags |= IFF_RUNNING; 710 splx(s); 711 lcp.Open(sp); 712 s = splnet(); 713 } 714 715 /* 716 * If the queueing discipline needs packet classification, 717 * do it before prepending link headers. 718 */ 719 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 720 721 #ifdef INET 722 if (dst->sa_family == AF_INET) { 723 struct ip *ip = NULL; 724 struct tcphdr *th = NULL; 725 726 if (m->m_len >= sizeof(struct ip)) { 727 ip = mtod(m, struct ip *); 728 if (ip->ip_p == IPPROTO_TCP && 729 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 730 sizeof(struct tcphdr)) { 731 th = (struct tcphdr *) 732 ((caddr_t)ip + (ip->ip_hl << 2)); 733 } 734 } else 735 ip = NULL; 736 737 /* 738 * When using dynamic local IP address assignment by using 739 * 0.0.0.0 as a local address, the first TCP session will 740 * not connect because the local TCP checksum is computed 741 * using 0.0.0.0 which will later become our real IP address 742 * so the TCP checksum computed at the remote end will 743 * become invalid. So we 744 * - don't let packets with src ip addr 0 thru 745 * - we flag TCP packets with src ip 0 as an error 746 */ 747 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 748 u_int8_t proto = ip->ip_p; 749 750 m_freem(m); 751 splx(s); 752 if (proto == IPPROTO_TCP) 753 return (EADDRNOTAVAIL); 754 else 755 return (0); 756 } 757 758 /* 759 * Put low delay, telnet, rlogin and ftp control packets 760 * in front of the queue. 761 */ 762 763 if (!IF_QFULL(&sp->pp_fastq) && 764 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 765 (th && (INTERACTIVE(ntohs(th->th_sport)) || 766 INTERACTIVE(ntohs(th->th_dport)))))) 767 ifq = &sp->pp_fastq; 768 } 769 #endif 770 771 #ifdef INET6 772 if (dst->sa_family == AF_INET6) { 773 /* XXX do something tricky here? */ 774 } 775 #endif 776 777 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 778 /* 779 * Prepend general data packet PPP header. For now, IP only. 780 */ 781 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 782 if (! m) { 783 if (ifp->if_flags & IFF_DEBUG) 784 log(LOG_DEBUG, "%s: no memory for transmit header\n", 785 ifp->if_xname); 786 ++ifp->if_oerrors; 787 splx(s); 788 return (ENOBUFS); 789 } 790 /* 791 * May want to check size of packet 792 * (albeit due to the implementation it's always enough) 793 */ 794 h = mtod(m, struct ppp_header *); 795 if (sp->pp_flags & PP_CISCO) { 796 h->address = CISCO_UNICAST; /* unicast address */ 797 h->control = 0; 798 } else { 799 h->address = PPP_ALLSTATIONS; /* broadcast address */ 800 h->control = PPP_UI; /* Unnumbered Info */ 801 } 802 } 803 804 switch (dst->sa_family) { 805 #ifdef INET 806 case AF_INET: /* Internet Protocol */ 807 if (sp->pp_flags & PP_CISCO) 808 protocol = htons(ETHERTYPE_IP); 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_IP); 820 if (sp->state[IDX_IPCP] != STATE_OPENED) 821 rv = ENETDOWN; 822 } 823 break; 824 #endif 825 #ifdef INET6 826 case AF_INET6: /* Internet Protocol version 6 */ 827 if (sp->pp_flags & PP_CISCO) 828 protocol = htons(ETHERTYPE_IPV6); 829 else { 830 /* 831 * Don't choke with an ENETDOWN early. It's 832 * possible that we just started dialing out, 833 * so don't drop the packet immediately. If 834 * we notice that we run out of buffer space 835 * below, we will however remember that we are 836 * not ready to carry IP packets, and return 837 * ENETDOWN, as opposed to ENOBUFS. 838 */ 839 protocol = htons(PPP_IPV6); 840 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 841 rv = ENETDOWN; 842 } 843 break; 844 #endif 845 #ifdef NS 846 case AF_NS: /* Xerox NS Protocol */ 847 protocol = htons((sp->pp_flags & PP_CISCO) ? 848 ETHERTYPE_NS : PPP_XNS); 849 break; 850 #endif 851 #ifdef IPX 852 case AF_IPX: /* Novell IPX Protocol */ 853 protocol = htons((sp->pp_flags & PP_CISCO) ? 854 ETHERTYPE_IPX : PPP_IPX); 855 break; 856 #endif 857 #ifdef ISO 858 case AF_ISO: /* ISO OSI Protocol */ 859 if (sp->pp_flags & PP_CISCO) 860 goto nosupport; 861 protocol = htons(PPP_ISO); 862 break; 863 nosupport: 864 #endif 865 default: 866 m_freem(m); 867 ++ifp->if_oerrors; 868 splx(s); 869 return (EAFNOSUPPORT); 870 } 871 872 if (sp->pp_flags & PP_NOFRAMING) { 873 M_PREPEND(m, 2, M_DONTWAIT); 874 if (m == NULL) { 875 if (ifp->if_flags & IFF_DEBUG) 876 log(LOG_DEBUG, "%s: no memory for transmit header\n", 877 ifp->if_xname); 878 ++ifp->if_oerrors; 879 splx(s); 880 return (ENOBUFS); 881 } 882 *mtod(m, u_int16_t *) = protocol; 883 } else { 884 h->protocol = protocol; 885 } 886 887 /* 888 * Queue message on interface, and start output if interface 889 * not yet active. 890 */ 891 len = m->m_pkthdr.len; 892 if (ifq != NULL 893 #ifdef ALTQ 894 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 895 #endif 896 ) { 897 if (IF_QFULL(ifq)) { 898 IF_DROP(&ifp->if_snd); 899 m_freem(m); 900 if (rv == 0) 901 rv = ENOBUFS; 902 } 903 else 904 IF_ENQUEUE(ifq, m); 905 } else 906 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 907 if (rv != 0) { 908 ++ifp->if_oerrors; 909 splx(s); 910 return (rv); 911 } 912 913 if (! (ifp->if_flags & IFF_OACTIVE)) 914 (*ifp->if_start)(ifp); 915 916 /* 917 * Count output packets and bytes. 918 * The packet length includes header + additional hardware framing 919 * according to RFC 1333. 920 */ 921 ifp->if_obytes += len + sp->pp_framebytes; 922 splx(s); 923 return (0); 924 } 925 926 void 927 sppp_attach(struct ifnet *ifp) 928 { 929 struct sppp *sp = (struct sppp *) ifp; 930 931 /* Initialize keepalive handler. */ 932 if (! spppq) { 933 callout_init(&keepalive_ch); 934 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 935 } 936 937 /* Insert new entry into the keepalive list. */ 938 sp->pp_next = spppq; 939 spppq = sp; 940 941 sp->pp_if.if_type = IFT_PPP; 942 sp->pp_if.if_output = sppp_output; 943 sp->pp_fastq.ifq_maxlen = 32; 944 sp->pp_cpq.ifq_maxlen = 20; 945 sp->pp_loopcnt = 0; 946 sp->pp_alivecnt = 0; 947 sp->pp_last_activity = 0; 948 sp->pp_last_receive = 0; 949 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 950 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 951 sp->pp_idle_timeout = 0; 952 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 953 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 954 sp->pp_auth_failures = 0; 955 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 956 sp->pp_phase = SPPP_PHASE_DEAD; 957 sp->pp_up = lcp.Up; 958 sp->pp_down = lcp.Down; 959 960 if_alloc_sadl(ifp); 961 962 memset(&sp->myauth, 0, sizeof sp->myauth); 963 memset(&sp->hisauth, 0, sizeof sp->hisauth); 964 sppp_lcp_init(sp); 965 sppp_ipcp_init(sp); 966 sppp_ipv6cp_init(sp); 967 sppp_pap_init(sp); 968 sppp_chap_init(sp); 969 } 970 971 void 972 sppp_detach(struct ifnet *ifp) 973 { 974 struct sppp **q, *p, *sp = (struct sppp *) ifp; 975 int i; 976 977 /* Remove the entry from the keepalive list. */ 978 for (q = &spppq; (p = *q); q = &p->pp_next) 979 if (p == sp) { 980 *q = p->pp_next; 981 break; 982 } 983 984 /* Stop keepalive handler. */ 985 if (! spppq) { 986 callout_stop(&keepalive_ch); 987 } 988 989 for (i = 0; i < IDX_COUNT; i++) { 990 callout_stop(&sp->ch[i]); 991 } 992 callout_stop(&sp->pap_my_to_ch); 993 994 /* free authentication info */ 995 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 996 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 997 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 998 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 999 1000 #if 0 /* done in if_detach() */ 1001 if_free_sadl(ifp); 1002 #endif 1003 } 1004 1005 /* 1006 * Flush the interface output queue. 1007 */ 1008 void 1009 sppp_flush(struct ifnet *ifp) 1010 { 1011 struct sppp *sp = (struct sppp *) ifp; 1012 1013 IFQ_PURGE(&sp->pp_if.if_snd); 1014 IF_PURGE(&sp->pp_fastq); 1015 IF_PURGE(&sp->pp_cpq); 1016 } 1017 1018 /* 1019 * Check if the output queue is empty. 1020 */ 1021 int 1022 sppp_isempty(struct ifnet *ifp) 1023 { 1024 struct sppp *sp = (struct sppp *) ifp; 1025 int empty, s; 1026 1027 s = splnet(); 1028 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1029 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1030 splx(s); 1031 return (empty); 1032 } 1033 1034 /* 1035 * Get next packet to send. 1036 */ 1037 struct mbuf * 1038 sppp_dequeue(struct ifnet *ifp) 1039 { 1040 struct sppp *sp = (struct sppp *) ifp; 1041 struct mbuf *m; 1042 int s; 1043 1044 s = splnet(); 1045 /* 1046 * Process only the control protocol queue until we have at 1047 * least one NCP open. 1048 * 1049 * Do always serve all three queues in Cisco mode. 1050 */ 1051 IF_DEQUEUE(&sp->pp_cpq, m); 1052 if (m == NULL && 1053 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1054 IF_DEQUEUE(&sp->pp_fastq, m); 1055 if (m == NULL) 1056 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1057 } 1058 splx(s); 1059 return m; 1060 } 1061 1062 /* 1063 * Process an ioctl request. Called on low priority level. 1064 */ 1065 int 1066 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1067 { 1068 struct ifreq *ifr = (struct ifreq *) data; 1069 struct sppp *sp = (struct sppp *) ifp; 1070 int s, error=0, going_up, going_down, newmode; 1071 1072 s = splnet(); 1073 switch (cmd) { 1074 case SIOCAIFADDR: 1075 case SIOCSIFDSTADDR: 1076 break; 1077 1078 case SIOCSIFADDR: 1079 if_up(ifp); 1080 /* fall through... */ 1081 1082 case SIOCSIFFLAGS: 1083 going_up = ifp->if_flags & IFF_UP && 1084 (ifp->if_flags & IFF_RUNNING) == 0; 1085 going_down = (ifp->if_flags & IFF_UP) == 0 && 1086 ifp->if_flags & IFF_RUNNING; 1087 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1088 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1089 /* sanity */ 1090 newmode = IFF_PASSIVE; 1091 ifp->if_flags &= ~IFF_AUTO; 1092 } 1093 1094 if (going_up || going_down) 1095 lcp.Close(sp); 1096 if (going_up && newmode == 0) { 1097 /* neither auto-dial nor passive */ 1098 ifp->if_flags |= IFF_RUNNING; 1099 if (!(sp->pp_flags & PP_CISCO)) 1100 lcp.Open(sp); 1101 } else if (going_down) { 1102 sppp_flush(ifp); 1103 ifp->if_flags &= ~IFF_RUNNING; 1104 } 1105 1106 break; 1107 1108 #ifdef SIOCSIFMTU 1109 #ifndef ifr_mtu 1110 #define ifr_mtu ifr_metric 1111 #endif 1112 case SIOCSIFMTU: 1113 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1114 error = EINVAL; 1115 break; 1116 } 1117 1118 ifp->if_mtu = ifr->ifr_mtu; 1119 break; 1120 #endif 1121 #ifdef SLIOCSETMTU 1122 case SLIOCSETMTU: 1123 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1124 { 1125 error = EINVAL; 1126 break; 1127 } 1128 1129 ifp->if_mtu = *(short *)data; 1130 break; 1131 #endif 1132 #ifdef SIOCGIFMTU 1133 case SIOCGIFMTU: 1134 ifr->ifr_mtu = ifp->if_mtu; 1135 break; 1136 #endif 1137 #ifdef SLIOCGETMTU 1138 case SLIOCGETMTU: 1139 *(short *)data = ifp->if_mtu; 1140 break; 1141 #endif 1142 case SIOCADDMULTI: 1143 case SIOCDELMULTI: 1144 break; 1145 1146 case SPPPSETAUTHCFG: 1147 case SPPPSETLCPCFG: 1148 case SPPPSETIDLETO: 1149 case SPPPSETAUTHFAILURE: 1150 case SPPPSETDNSOPTS: 1151 case SPPPSETKEEPALIVE: 1152 { 1153 struct proc *p = curproc; /* XXX */ 1154 1155 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1156 break; 1157 } 1158 /* FALLTHROUGH */ 1159 case SPPPGETAUTHCFG: 1160 case SPPPGETLCPCFG: 1161 case SPPPGETSTATUS: 1162 case SPPPGETIDLETO: 1163 case SPPPGETAUTHFAILURES: 1164 case SPPPGETDNSOPTS: 1165 case SPPPGETDNSADDRS: 1166 case SPPPGETKEEPALIVE: 1167 error = sppp_params(sp, cmd, data); 1168 break; 1169 1170 default: 1171 error = ENOTTY; 1172 } 1173 splx(s); 1174 return (error); 1175 } 1176 1177 1178 /* 1179 * Cisco framing implementation. 1180 */ 1181 1182 /* 1183 * Handle incoming Cisco keepalive protocol packets. 1184 */ 1185 static void 1186 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1187 { 1188 STDDCL; 1189 struct cisco_packet *h; 1190 u_int32_t me, mymask; 1191 1192 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1193 if (debug) 1194 log(LOG_DEBUG, 1195 "%s: cisco invalid packet length: %d bytes\n", 1196 ifp->if_xname, m->m_pkthdr.len); 1197 return; 1198 } 1199 h = mtod(m, struct cisco_packet *); 1200 if (debug) 1201 log(LOG_DEBUG, 1202 "%s: cisco input: %d bytes " 1203 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1204 ifp->if_xname, m->m_pkthdr.len, 1205 ntohl (h->type), h->par1, h->par2, (u_int)h->rel, 1206 (u_int)h->time0, (u_int)h->time1); 1207 switch (ntohl (h->type)) { 1208 default: 1209 if (debug) 1210 addlog("%s: cisco unknown packet type: 0x%x\n", 1211 ifp->if_xname, ntohl (h->type)); 1212 break; 1213 case CISCO_ADDR_REPLY: 1214 /* Reply on address request, ignore */ 1215 break; 1216 case CISCO_KEEPALIVE_REQ: 1217 sp->pp_alivecnt = 0; 1218 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1219 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1220 /* Local and remote sequence numbers are equal. 1221 * Probably, the line is in loopback mode. */ 1222 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1223 printf ("%s: loopback\n", 1224 ifp->if_xname); 1225 sp->pp_loopcnt = 0; 1226 if (ifp->if_flags & IFF_UP) { 1227 if_down(ifp); 1228 IF_PURGE(&sp->pp_cpq); 1229 } 1230 } 1231 ++sp->pp_loopcnt; 1232 1233 /* Generate new local sequence number */ 1234 sp->pp_seq[IDX_LCP] = arc4random(); 1235 break; 1236 } 1237 sp->pp_loopcnt = 0; 1238 if (! (ifp->if_flags & IFF_UP) && 1239 (ifp->if_flags & IFF_RUNNING)) { 1240 if_up(ifp); 1241 } 1242 break; 1243 case CISCO_ADDR_REQ: 1244 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1245 if (me != 0L) 1246 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1247 break; 1248 } 1249 } 1250 1251 /* 1252 * Send Cisco keepalive packet. 1253 */ 1254 static void 1255 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1256 { 1257 STDDCL; 1258 struct ppp_header *h; 1259 struct cisco_packet *ch; 1260 struct mbuf *m; 1261 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1262 1263 MGETHDR(m, M_DONTWAIT, MT_DATA); 1264 if (! m) 1265 return; 1266 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1267 m->m_pkthdr.rcvif = 0; 1268 1269 h = mtod(m, struct ppp_header *); 1270 h->address = CISCO_MULTICAST; 1271 h->control = 0; 1272 h->protocol = htons(CISCO_KEEPALIVE); 1273 1274 ch = (struct cisco_packet *)(h + 1); 1275 ch->type = htonl(type); 1276 ch->par1 = htonl(par1); 1277 ch->par2 = htonl(par2); 1278 ch->rel = -1; 1279 1280 ch->time0 = htons((u_short)(t >> 16)); 1281 ch->time1 = htons((u_short) t); 1282 1283 if (debug) 1284 log(LOG_DEBUG, 1285 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1286 ifp->if_xname, ntohl (ch->type), ch->par1, 1287 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1288 (u_int)ch->time1); 1289 1290 if (IF_QFULL(&sp->pp_cpq)) { 1291 IF_DROP(&sp->pp_fastq); 1292 IF_DROP(&ifp->if_snd); 1293 m_freem(m); 1294 ++ifp->if_oerrors; 1295 return; 1296 } else 1297 IF_ENQUEUE(&sp->pp_cpq, m); 1298 if (! (ifp->if_flags & IFF_OACTIVE)) 1299 (*ifp->if_start)(ifp); 1300 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1301 } 1302 1303 /* 1304 * PPP protocol implementation. 1305 */ 1306 1307 /* 1308 * Send PPP control protocol packet. 1309 */ 1310 static void 1311 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1312 u_char ident, u_short len, void *data) 1313 { 1314 STDDCL; 1315 struct lcp_header *lh; 1316 struct mbuf *m; 1317 size_t pkthdrlen; 1318 1319 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1320 1321 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1322 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1323 MGETHDR(m, M_DONTWAIT, MT_DATA); 1324 if (! m) 1325 return; 1326 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1327 m->m_pkthdr.rcvif = 0; 1328 1329 if (sp->pp_flags & PP_NOFRAMING) { 1330 *mtod(m, u_int16_t *) = htons(proto); 1331 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1332 } else { 1333 struct ppp_header *h; 1334 h = mtod(m, struct ppp_header *); 1335 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1336 h->control = PPP_UI; /* Unnumbered Info */ 1337 h->protocol = htons(proto); /* Link Control Protocol */ 1338 lh = (struct lcp_header *)(h + 1); 1339 } 1340 lh->type = type; 1341 lh->ident = ident; 1342 lh->len = htons(LCP_HEADER_LEN + len); 1343 if (len) 1344 bcopy (data, lh + 1, len); 1345 1346 if (debug) { 1347 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1348 ifp->if_xname, 1349 sppp_proto_name(proto), 1350 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1351 if (len) 1352 sppp_print_bytes((u_char *)(lh + 1), len); 1353 addlog(">\n"); 1354 } 1355 if (IF_QFULL(&sp->pp_cpq)) { 1356 IF_DROP(&sp->pp_fastq); 1357 IF_DROP(&ifp->if_snd); 1358 m_freem(m); 1359 ++ifp->if_oerrors; 1360 return; 1361 } else 1362 IF_ENQUEUE(&sp->pp_cpq, m); 1363 if (! (ifp->if_flags & IFF_OACTIVE)) 1364 (*ifp->if_start)(ifp); 1365 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1366 } 1367 1368 /* 1369 * Handle incoming PPP control protocol packets. 1370 */ 1371 static void 1372 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1373 { 1374 STDDCL; 1375 struct lcp_header *h; 1376 int len = m->m_pkthdr.len; 1377 int rv; 1378 u_char *p; 1379 u_int32_t u32; 1380 1381 if (len < 4) { 1382 if (debug) 1383 log(LOG_DEBUG, 1384 "%s: %s invalid packet length: %d bytes\n", 1385 ifp->if_xname, cp->name, len); 1386 return; 1387 } 1388 h = mtod(m, struct lcp_header *); 1389 if (debug) { 1390 log(LOG_DEBUG, 1391 "%s: %s input(%s): <%s id=0x%x len=%d", 1392 ifp->if_xname, cp->name, 1393 sppp_state_name(sp->state[cp->protoidx]), 1394 sppp_cp_type_name(h->type), h->ident, ntohs(h->len)); 1395 if (len > 4) 1396 sppp_print_bytes((u_char *)(h + 1), len - 4); 1397 addlog(">\n"); 1398 } 1399 if (len > ntohs(h->len)) 1400 len = ntohs(h->len); 1401 p = (u_char *)(h + 1); 1402 switch (h->type) { 1403 case CONF_REQ: 1404 if (len < 4) { 1405 if (debug) 1406 addlog("%s: %s invalid conf-req length %d\n", 1407 ifp->if_xname, cp->name, 1408 len); 1409 ++ifp->if_ierrors; 1410 break; 1411 } 1412 /* handle states where RCR doesn't get a SCA/SCN */ 1413 switch (sp->state[cp->protoidx]) { 1414 case STATE_CLOSING: 1415 case STATE_STOPPING: 1416 return; 1417 case STATE_CLOSED: 1418 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1419 0, 0); 1420 return; 1421 } 1422 rv = (cp->RCR)(sp, h, len); 1423 switch (sp->state[cp->protoidx]) { 1424 case STATE_OPENED: 1425 (cp->tld)(sp); 1426 (cp->scr)(sp); 1427 /* fall through... */ 1428 case STATE_ACK_SENT: 1429 case STATE_REQ_SENT: 1430 sppp_cp_change_state(cp, sp, rv? 1431 STATE_ACK_SENT: STATE_REQ_SENT); 1432 break; 1433 case STATE_STOPPED: 1434 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1435 (cp->scr)(sp); 1436 sppp_cp_change_state(cp, sp, rv? 1437 STATE_ACK_SENT: STATE_REQ_SENT); 1438 break; 1439 case STATE_ACK_RCVD: 1440 if (rv) { 1441 sppp_cp_change_state(cp, sp, STATE_OPENED); 1442 if (debug) 1443 log(LOG_DEBUG, "%s: %s tlu\n", 1444 ifp->if_xname, 1445 cp->name); 1446 (cp->tlu)(sp); 1447 } else 1448 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1449 break; 1450 default: 1451 printf("%s: %s illegal %s in state %s\n", 1452 ifp->if_xname, cp->name, 1453 sppp_cp_type_name(h->type), 1454 sppp_state_name(sp->state[cp->protoidx])); 1455 ++ifp->if_ierrors; 1456 } 1457 break; 1458 case CONF_ACK: 1459 if (h->ident != sp->confid[cp->protoidx]) { 1460 if (debug) 1461 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1462 ifp->if_xname, cp->name, 1463 h->ident, sp->confid[cp->protoidx]); 1464 ++ifp->if_ierrors; 1465 break; 1466 } 1467 switch (sp->state[cp->protoidx]) { 1468 case STATE_CLOSED: 1469 case STATE_STOPPED: 1470 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1471 break; 1472 case STATE_CLOSING: 1473 case STATE_STOPPING: 1474 break; 1475 case STATE_REQ_SENT: 1476 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1477 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1478 break; 1479 case STATE_OPENED: 1480 (cp->tld)(sp); 1481 /* fall through */ 1482 case STATE_ACK_RCVD: 1483 (cp->scr)(sp); 1484 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1485 break; 1486 case STATE_ACK_SENT: 1487 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1488 sppp_cp_change_state(cp, sp, STATE_OPENED); 1489 if (debug) 1490 log(LOG_DEBUG, "%s: %s tlu\n", 1491 ifp->if_xname, cp->name); 1492 (cp->tlu)(sp); 1493 break; 1494 default: 1495 printf("%s: %s illegal %s in state %s\n", 1496 ifp->if_xname, cp->name, 1497 sppp_cp_type_name(h->type), 1498 sppp_state_name(sp->state[cp->protoidx])); 1499 ++ifp->if_ierrors; 1500 } 1501 break; 1502 case CONF_NAK: 1503 case CONF_REJ: 1504 if (h->ident != sp->confid[cp->protoidx]) { 1505 if (debug) 1506 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1507 ifp->if_xname, cp->name, 1508 h->ident, sp->confid[cp->protoidx]); 1509 ++ifp->if_ierrors; 1510 break; 1511 } 1512 if (h->type == CONF_NAK) 1513 (cp->RCN_nak)(sp, h, len); 1514 else /* CONF_REJ */ 1515 (cp->RCN_rej)(sp, h, len); 1516 1517 switch (sp->state[cp->protoidx]) { 1518 case STATE_CLOSED: 1519 case STATE_STOPPED: 1520 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1521 break; 1522 case STATE_REQ_SENT: 1523 case STATE_ACK_SENT: 1524 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1525 (cp->scr)(sp); 1526 break; 1527 case STATE_OPENED: 1528 (cp->tld)(sp); 1529 /* fall through */ 1530 case STATE_ACK_RCVD: 1531 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1532 (cp->scr)(sp); 1533 break; 1534 case STATE_CLOSING: 1535 case STATE_STOPPING: 1536 break; 1537 default: 1538 printf("%s: %s illegal %s in state %s\n", 1539 ifp->if_xname, cp->name, 1540 sppp_cp_type_name(h->type), 1541 sppp_state_name(sp->state[cp->protoidx])); 1542 ++ifp->if_ierrors; 1543 } 1544 break; 1545 1546 case TERM_REQ: 1547 switch (sp->state[cp->protoidx]) { 1548 case STATE_ACK_RCVD: 1549 case STATE_ACK_SENT: 1550 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1551 /* fall through */ 1552 case STATE_CLOSED: 1553 case STATE_STOPPED: 1554 case STATE_CLOSING: 1555 case STATE_STOPPING: 1556 case STATE_REQ_SENT: 1557 sta: 1558 /* Send Terminate-Ack packet. */ 1559 if (debug) 1560 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1561 ifp->if_xname, cp->name); 1562 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1563 break; 1564 case STATE_OPENED: 1565 (cp->tld)(sp); 1566 sp->rst_counter[cp->protoidx] = 0; 1567 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1568 goto sta; 1569 default: 1570 printf("%s: %s illegal %s in state %s\n", 1571 ifp->if_xname, cp->name, 1572 sppp_cp_type_name(h->type), 1573 sppp_state_name(sp->state[cp->protoidx])); 1574 ++ifp->if_ierrors; 1575 } 1576 break; 1577 case TERM_ACK: 1578 switch (sp->state[cp->protoidx]) { 1579 case STATE_CLOSED: 1580 case STATE_STOPPED: 1581 case STATE_REQ_SENT: 1582 case STATE_ACK_SENT: 1583 break; 1584 case STATE_CLOSING: 1585 (cp->tlf)(sp); 1586 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1587 sppp_lcp_check_and_close(sp); 1588 break; 1589 case STATE_STOPPING: 1590 (cp->tlf)(sp); 1591 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1592 sppp_lcp_check_and_close(sp); 1593 break; 1594 case STATE_ACK_RCVD: 1595 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1596 break; 1597 case STATE_OPENED: 1598 (cp->tld)(sp); 1599 (cp->scr)(sp); 1600 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1601 break; 1602 default: 1603 printf("%s: %s illegal %s in state %s\n", 1604 ifp->if_xname, cp->name, 1605 sppp_cp_type_name(h->type), 1606 sppp_state_name(sp->state[cp->protoidx])); 1607 ++ifp->if_ierrors; 1608 } 1609 break; 1610 case CODE_REJ: 1611 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1612 log(LOG_INFO, 1613 "%s: %s: ignoring RXJ (%s) for code ?, " 1614 "danger will robinson\n", 1615 ifp->if_xname, cp->name, 1616 sppp_cp_type_name(h->type)); 1617 switch (sp->state[cp->protoidx]) { 1618 case STATE_CLOSED: 1619 case STATE_STOPPED: 1620 case STATE_REQ_SENT: 1621 case STATE_ACK_SENT: 1622 case STATE_CLOSING: 1623 case STATE_STOPPING: 1624 case STATE_OPENED: 1625 break; 1626 case STATE_ACK_RCVD: 1627 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1628 break; 1629 default: 1630 printf("%s: %s illegal %s in state %s\n", 1631 ifp->if_xname, cp->name, 1632 sppp_cp_type_name(h->type), 1633 sppp_state_name(sp->state[cp->protoidx])); 1634 ++ifp->if_ierrors; 1635 } 1636 break; 1637 case PROTO_REJ: 1638 { 1639 int catastrophic; 1640 const struct cp *upper; 1641 int i; 1642 u_int16_t proto; 1643 1644 catastrophic = 0; 1645 upper = NULL; 1646 proto = p[0] << 8 | p[1]; 1647 for (i = 0; i < IDX_COUNT; i++) { 1648 if (cps[i]->proto == proto) { 1649 upper = cps[i]; 1650 break; 1651 } 1652 } 1653 if (upper == NULL) 1654 catastrophic++; 1655 1656 if (debug) 1657 log(LOG_INFO, 1658 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1659 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1660 sppp_cp_type_name(h->type), proto, 1661 upper ? upper->name : "unknown", 1662 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1663 1664 /* 1665 * if we got RXJ+ against conf-req, the peer does not implement 1666 * this particular protocol type. terminate the protocol. 1667 */ 1668 if (upper && !catastrophic) { 1669 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1670 upper->Close(sp); 1671 break; 1672 } 1673 } 1674 1675 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1676 switch (sp->state[cp->protoidx]) { 1677 case STATE_CLOSED: 1678 case STATE_STOPPED: 1679 case STATE_REQ_SENT: 1680 case STATE_ACK_SENT: 1681 case STATE_CLOSING: 1682 case STATE_STOPPING: 1683 case STATE_OPENED: 1684 break; 1685 case STATE_ACK_RCVD: 1686 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1687 break; 1688 default: 1689 printf("%s: %s illegal %s in state %s\n", 1690 ifp->if_xname, cp->name, 1691 sppp_cp_type_name(h->type), 1692 sppp_state_name(sp->state[cp->protoidx])); 1693 ++ifp->if_ierrors; 1694 } 1695 break; 1696 } 1697 case DISC_REQ: 1698 if (cp->proto != PPP_LCP) 1699 goto illegal; 1700 /* Discard the packet. */ 1701 break; 1702 case ECHO_REQ: 1703 if (cp->proto != PPP_LCP) 1704 goto illegal; 1705 if (sp->state[cp->protoidx] != STATE_OPENED) { 1706 if (debug) 1707 addlog("%s: lcp echo req but lcp closed\n", 1708 ifp->if_xname); 1709 ++ifp->if_ierrors; 1710 break; 1711 } 1712 if (len < 8) { 1713 if (debug) 1714 addlog("%s: invalid lcp echo request " 1715 "packet length: %d bytes\n", 1716 ifp->if_xname, len); 1717 break; 1718 } 1719 memcpy(&u32, h + 1, sizeof u32); 1720 if (ntohl(u32) == sp->lcp.magic) { 1721 /* Line loopback mode detected. */ 1722 printf("%s: loopback\n", ifp->if_xname); 1723 if_down(ifp); 1724 IF_PURGE(&sp->pp_cpq); 1725 1726 /* Shut down the PPP link. */ 1727 /* XXX */ 1728 lcp.Down(sp); 1729 lcp.Up(sp); 1730 break; 1731 } 1732 u32 = htonl(sp->lcp.magic); 1733 memcpy(h + 1, &u32, sizeof u32); 1734 if (debug) 1735 addlog("%s: got lcp echo req, sending echo rep\n", 1736 ifp->if_xname); 1737 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1738 h + 1); 1739 break; 1740 case ECHO_REPLY: 1741 if (cp->proto != PPP_LCP) 1742 goto illegal; 1743 if (h->ident != sp->lcp.echoid) { 1744 ++ifp->if_ierrors; 1745 break; 1746 } 1747 if (len < 8) { 1748 if (debug) 1749 addlog("%s: lcp invalid echo reply " 1750 "packet length: %d bytes\n", 1751 ifp->if_xname, len); 1752 break; 1753 } 1754 if (debug) 1755 addlog("%s: lcp got echo rep\n", 1756 ifp->if_xname); 1757 memcpy(&u32, h + 1, sizeof u32); 1758 if (ntohl(u32) != sp->lcp.magic) 1759 sp->pp_alivecnt = 0; 1760 break; 1761 default: 1762 /* Unknown packet type -- send Code-Reject packet. */ 1763 illegal: 1764 if (debug) 1765 addlog("%s: %s send code-rej for 0x%x\n", 1766 ifp->if_xname, cp->name, h->type); 1767 sppp_cp_send(sp, cp->proto, CODE_REJ, 1768 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1769 ++ifp->if_ierrors; 1770 } 1771 } 1772 1773 1774 /* 1775 * The generic part of all Up/Down/Open/Close/TO event handlers. 1776 * Basically, the state transition handling in the automaton. 1777 */ 1778 static void 1779 sppp_up_event(const struct cp *cp, struct sppp *sp) 1780 { 1781 STDDCL; 1782 1783 if (debug) 1784 log(LOG_DEBUG, "%s: %s up(%s)\n", 1785 ifp->if_xname, cp->name, 1786 sppp_state_name(sp->state[cp->protoidx])); 1787 1788 switch (sp->state[cp->protoidx]) { 1789 case STATE_INITIAL: 1790 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1791 break; 1792 case STATE_STARTING: 1793 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1794 (cp->scr)(sp); 1795 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1796 break; 1797 default: 1798 printf("%s: %s illegal up in state %s\n", 1799 ifp->if_xname, cp->name, 1800 sppp_state_name(sp->state[cp->protoidx])); 1801 } 1802 } 1803 1804 static void 1805 sppp_down_event(const struct cp *cp, struct sppp *sp) 1806 { 1807 STDDCL; 1808 1809 if (debug) 1810 log(LOG_DEBUG, "%s: %s down(%s)\n", 1811 ifp->if_xname, cp->name, 1812 sppp_state_name(sp->state[cp->protoidx])); 1813 1814 switch (sp->state[cp->protoidx]) { 1815 case STATE_CLOSED: 1816 case STATE_CLOSING: 1817 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1818 break; 1819 case STATE_STOPPED: 1820 (cp->tls)(sp); 1821 /* fall through */ 1822 case STATE_STOPPING: 1823 case STATE_REQ_SENT: 1824 case STATE_ACK_RCVD: 1825 case STATE_ACK_SENT: 1826 sppp_cp_change_state(cp, sp, STATE_STARTING); 1827 break; 1828 case STATE_OPENED: 1829 (cp->tld)(sp); 1830 sppp_cp_change_state(cp, sp, STATE_STARTING); 1831 break; 1832 default: 1833 printf("%s: %s illegal down in state %s\n", 1834 ifp->if_xname, cp->name, 1835 sppp_state_name(sp->state[cp->protoidx])); 1836 } 1837 } 1838 1839 1840 static void 1841 sppp_open_event(const struct cp *cp, struct sppp *sp) 1842 { 1843 STDDCL; 1844 1845 if (debug) 1846 log(LOG_DEBUG, "%s: %s open(%s)\n", 1847 ifp->if_xname, cp->name, 1848 sppp_state_name(sp->state[cp->protoidx])); 1849 1850 switch (sp->state[cp->protoidx]) { 1851 case STATE_INITIAL: 1852 (cp->tls)(sp); 1853 sppp_cp_change_state(cp, sp, STATE_STARTING); 1854 break; 1855 case STATE_STARTING: 1856 break; 1857 case STATE_CLOSED: 1858 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1859 (cp->scr)(sp); 1860 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1861 break; 1862 case STATE_STOPPED: 1863 case STATE_STOPPING: 1864 case STATE_REQ_SENT: 1865 case STATE_ACK_RCVD: 1866 case STATE_ACK_SENT: 1867 case STATE_OPENED: 1868 break; 1869 case STATE_CLOSING: 1870 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1871 break; 1872 } 1873 } 1874 1875 1876 static void 1877 sppp_close_event(const struct cp *cp, struct sppp *sp) 1878 { 1879 STDDCL; 1880 1881 if (debug) 1882 log(LOG_DEBUG, "%s: %s close(%s)\n", 1883 ifp->if_xname, cp->name, 1884 sppp_state_name(sp->state[cp->protoidx])); 1885 1886 switch (sp->state[cp->protoidx]) { 1887 case STATE_INITIAL: 1888 case STATE_CLOSED: 1889 case STATE_CLOSING: 1890 break; 1891 case STATE_STARTING: 1892 (cp->tlf)(sp); 1893 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1894 break; 1895 case STATE_STOPPED: 1896 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1897 break; 1898 case STATE_STOPPING: 1899 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1900 break; 1901 case STATE_OPENED: 1902 (cp->tld)(sp); 1903 /* fall through */ 1904 case STATE_REQ_SENT: 1905 case STATE_ACK_RCVD: 1906 case STATE_ACK_SENT: 1907 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1908 sppp_cp_send(sp, cp->proto, TERM_REQ, 1909 ++sp->pp_seq[cp->protoidx], 0, 0); 1910 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1911 break; 1912 } 1913 } 1914 1915 static void 1916 sppp_to_event(const struct cp *cp, struct sppp *sp) 1917 { 1918 STDDCL; 1919 int s; 1920 1921 s = splnet(); 1922 if (debug) 1923 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1924 ifp->if_xname, cp->name, 1925 sppp_state_name(sp->state[cp->protoidx]), 1926 sp->rst_counter[cp->protoidx]); 1927 1928 if (--sp->rst_counter[cp->protoidx] < 0) 1929 /* TO- event */ 1930 switch (sp->state[cp->protoidx]) { 1931 case STATE_CLOSING: 1932 (cp->tlf)(sp); 1933 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1934 sppp_lcp_check_and_close(sp); 1935 break; 1936 case STATE_STOPPING: 1937 (cp->tlf)(sp); 1938 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1939 sppp_lcp_check_and_close(sp); 1940 break; 1941 case STATE_REQ_SENT: 1942 case STATE_ACK_RCVD: 1943 case STATE_ACK_SENT: 1944 (cp->tlf)(sp); 1945 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1946 sppp_lcp_check_and_close(sp); 1947 break; 1948 } 1949 else 1950 /* TO+ event */ 1951 switch (sp->state[cp->protoidx]) { 1952 case STATE_CLOSING: 1953 case STATE_STOPPING: 1954 sppp_cp_send(sp, cp->proto, TERM_REQ, 1955 ++sp->pp_seq[cp->protoidx], 0, 0); 1956 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1957 cp->TO, sp); 1958 break; 1959 case STATE_REQ_SENT: 1960 case STATE_ACK_RCVD: 1961 (cp->scr)(sp); 1962 /* sppp_cp_change_state() will restart the timer */ 1963 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1964 break; 1965 case STATE_ACK_SENT: 1966 (cp->scr)(sp); 1967 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1968 cp->TO, sp); 1969 break; 1970 } 1971 1972 splx(s); 1973 } 1974 1975 /* 1976 * Change the state of a control protocol in the state automaton. 1977 * Takes care of starting/stopping the restart timer. 1978 */ 1979 void 1980 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1981 { 1982 sp->state[cp->protoidx] = newstate; 1983 callout_stop(&sp->ch[cp->protoidx]); 1984 switch (newstate) { 1985 case STATE_INITIAL: 1986 case STATE_STARTING: 1987 case STATE_CLOSED: 1988 case STATE_STOPPED: 1989 case STATE_OPENED: 1990 break; 1991 case STATE_CLOSING: 1992 case STATE_STOPPING: 1993 case STATE_REQ_SENT: 1994 case STATE_ACK_RCVD: 1995 case STATE_ACK_SENT: 1996 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1997 cp->TO, sp); 1998 break; 1999 } 2000 } 2001 2002 /* 2003 *--------------------------------------------------------------------------* 2004 * * 2005 * The LCP implementation. * 2006 * * 2007 *--------------------------------------------------------------------------* 2008 */ 2009 static void 2010 sppp_lcp_init(struct sppp *sp) 2011 { 2012 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2013 sp->lcp.magic = 0; 2014 sp->state[IDX_LCP] = STATE_INITIAL; 2015 sp->fail_counter[IDX_LCP] = 0; 2016 sp->pp_seq[IDX_LCP] = 0; 2017 sp->pp_rseq[IDX_LCP] = 0; 2018 sp->lcp.protos = 0; 2019 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2020 2021 /* 2022 * Initialize counters and timeout values. Note that we don't 2023 * use the 3 seconds suggested in RFC 1661 since we are likely 2024 * running on a fast link. XXX We should probably implement 2025 * the exponential backoff option. Note that these values are 2026 * relevant for all control protocols, not just LCP only. 2027 */ 2028 sp->lcp.timeout = 1 * hz; 2029 sp->lcp.max_terminate = 2; 2030 sp->lcp.max_configure = 10; 2031 sp->lcp.max_failure = 10; 2032 callout_init(&sp->ch[IDX_LCP]); 2033 } 2034 2035 static void 2036 sppp_lcp_up(struct sppp *sp) 2037 { 2038 STDDCL; 2039 2040 /* Initialize activity timestamp: opening a connection is an activity */ 2041 sp->pp_last_receive = sp->pp_last_activity = mono_time.tv_sec; 2042 2043 /* 2044 * If this interface is passive or dial-on-demand, and we are 2045 * still in Initial state, it means we've got an incoming 2046 * call. Activate the interface. 2047 */ 2048 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2049 if (debug) 2050 log(LOG_DEBUG, 2051 "%s: Up event", ifp->if_xname); 2052 ifp->if_flags |= IFF_RUNNING; 2053 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2054 if (debug) 2055 addlog("(incoming call)\n"); 2056 sp->pp_flags |= PP_CALLIN; 2057 lcp.Open(sp); 2058 } else if (debug) 2059 addlog("\n"); 2060 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2061 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2062 ifp->if_flags |= IFF_RUNNING; 2063 lcp.Open(sp); 2064 } 2065 2066 sppp_up_event(&lcp, sp); 2067 } 2068 2069 static void 2070 sppp_lcp_down(struct sppp *sp) 2071 { 2072 STDDCL; 2073 2074 sppp_down_event(&lcp, sp); 2075 2076 /* 2077 * If this is neither a dial-on-demand nor a passive 2078 * interface, simulate an ``ifconfig down'' action, so the 2079 * administrator can force a redial by another ``ifconfig 2080 * up''. XXX For leased line operation, should we immediately 2081 * try to reopen the connection here? 2082 */ 2083 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2084 if (debug) 2085 log(LOG_INFO, 2086 "%s: Down event (carrier loss), taking interface down.\n", 2087 ifp->if_xname); 2088 if_down(ifp); 2089 } else { 2090 if (debug) 2091 log(LOG_DEBUG, 2092 "%s: Down event (carrier loss)\n", 2093 ifp->if_xname); 2094 } 2095 sp->pp_flags &= ~PP_CALLIN; 2096 if (sp->state[IDX_LCP] != STATE_INITIAL) 2097 lcp.Close(sp); 2098 ifp->if_flags &= ~IFF_RUNNING; 2099 } 2100 2101 static void 2102 sppp_lcp_open(struct sppp *sp) 2103 { 2104 /* 2105 * If we are authenticator, negotiate LCP_AUTH 2106 */ 2107 if (sp->hisauth.proto != 0) 2108 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2109 else 2110 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2111 sp->pp_flags &= ~PP_NEEDAUTH; 2112 sppp_open_event(&lcp, sp); 2113 } 2114 2115 static void 2116 sppp_lcp_close(struct sppp *sp) 2117 { 2118 sppp_close_event(&lcp, sp); 2119 } 2120 2121 static void 2122 sppp_lcp_TO(void *cookie) 2123 { 2124 sppp_to_event(&lcp, (struct sppp *)cookie); 2125 } 2126 2127 /* 2128 * Analyze a configure request. Return true if it was agreeable, and 2129 * caused action sca, false if it has been rejected or nak'ed, and 2130 * caused action scn. (The return value is used to make the state 2131 * transition decision in the state automaton.) 2132 */ 2133 static int 2134 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2135 { 2136 STDDCL; 2137 u_char *buf, *r, *p; 2138 int origlen, rlen; 2139 u_int32_t nmagic; 2140 u_short authproto; 2141 2142 len -= 4; 2143 origlen = len; 2144 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2145 if (! buf) 2146 return (0); 2147 2148 if (debug) 2149 log(LOG_DEBUG, "%s: lcp parse opts:", 2150 ifp->if_xname); 2151 2152 /* pass 1: check for things that need to be rejected */ 2153 p = (void *)(h + 1); 2154 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2155 if (debug) 2156 addlog(" %s", sppp_lcp_opt_name(*p)); 2157 switch (*p) { 2158 case LCP_OPT_MAGIC: 2159 /* Magic number. */ 2160 /* fall through, both are same length */ 2161 case LCP_OPT_ASYNC_MAP: 2162 /* Async control character map. */ 2163 if (len >= 6 || p[1] == 6) 2164 continue; 2165 if (debug) 2166 addlog(" [invalid]"); 2167 break; 2168 case LCP_OPT_MRU: 2169 /* Maximum receive unit. */ 2170 if (len >= 4 && p[1] == 4) 2171 continue; 2172 if (debug) 2173 addlog(" [invalid]"); 2174 break; 2175 case LCP_OPT_AUTH_PROTO: 2176 if (len < 4) { 2177 if (debug) 2178 addlog(" [invalid]"); 2179 break; 2180 } 2181 authproto = (p[2] << 8) + p[3]; 2182 if (authproto == PPP_CHAP && p[1] != 5) { 2183 if (debug) 2184 addlog(" [invalid chap len]"); 2185 break; 2186 } 2187 if (sp->myauth.proto == 0) { 2188 /* we are not configured to do auth */ 2189 if (debug) 2190 addlog(" [not configured]"); 2191 break; 2192 } 2193 /* 2194 * Remote want us to authenticate, remember this, 2195 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2196 * up. 2197 */ 2198 sp->pp_flags |= PP_NEEDAUTH; 2199 continue; 2200 default: 2201 /* Others not supported. */ 2202 if (debug) 2203 addlog(" [rej]"); 2204 break; 2205 } 2206 /* Add the option to rejected list. */ 2207 bcopy (p, r, p[1]); 2208 r += p[1]; 2209 rlen += p[1]; 2210 } 2211 if (rlen) { 2212 if (debug) 2213 addlog(" send conf-rej\n"); 2214 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2215 goto end; 2216 } else if (debug) 2217 addlog("\n"); 2218 2219 /* 2220 * pass 2: check for option values that are unacceptable and 2221 * thus require to be nak'ed. 2222 */ 2223 if (debug) 2224 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2225 ifp->if_xname); 2226 2227 p = (void *)(h + 1); 2228 len = origlen; 2229 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2230 if (debug) 2231 addlog(" %s", sppp_lcp_opt_name(*p)); 2232 switch (*p) { 2233 case LCP_OPT_MAGIC: 2234 /* Magic number -- extract. */ 2235 nmagic = (u_int32_t)p[2] << 24 | 2236 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2237 if (nmagic != sp->lcp.magic) { 2238 if (debug) 2239 addlog(" 0x%x", nmagic); 2240 continue; 2241 } 2242 /* 2243 * Local and remote magics equal -- loopback? 2244 */ 2245 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2246 printf ("%s: loopback\n", 2247 ifp->if_xname); 2248 sp->pp_loopcnt = 0; 2249 if (ifp->if_flags & IFF_UP) { 2250 if_down(ifp); 2251 IF_PURGE(&sp->pp_cpq); 2252 /* XXX ? */ 2253 lcp.Down(sp); 2254 lcp.Up(sp); 2255 } 2256 } else if (debug) 2257 addlog(" [glitch]"); 2258 ++sp->pp_loopcnt; 2259 /* 2260 * We negate our magic here, and NAK it. If 2261 * we see it later in an NAK packet, we 2262 * suggest a new one. 2263 */ 2264 nmagic = ~sp->lcp.magic; 2265 /* Gonna NAK it. */ 2266 p[2] = nmagic >> 24; 2267 p[3] = nmagic >> 16; 2268 p[4] = nmagic >> 8; 2269 p[5] = nmagic; 2270 break; 2271 2272 case LCP_OPT_ASYNC_MAP: 2273 /* 2274 * Async control character map -- just ignore it. 2275 * 2276 * Quote from RFC 1662, chapter 6: 2277 * To enable this functionality, synchronous PPP 2278 * implementations MUST always respond to the 2279 * Async-Control-Character-Map Configuration 2280 * Option with the LCP Configure-Ack. However, 2281 * acceptance of the Configuration Option does 2282 * not imply that the synchronous implementation 2283 * will do any ACCM mapping. Instead, all such 2284 * octet mapping will be performed by the 2285 * asynchronous-to-synchronous converter. 2286 */ 2287 continue; 2288 2289 case LCP_OPT_MRU: 2290 /* 2291 * Maximum receive unit. Always agreeable, 2292 * but ignored by now. 2293 */ 2294 sp->lcp.their_mru = p[2] * 256 + p[3]; 2295 if (debug) 2296 addlog(" %ld", sp->lcp.their_mru); 2297 continue; 2298 2299 case LCP_OPT_AUTH_PROTO: 2300 authproto = (p[2] << 8) + p[3]; 2301 if (sp->myauth.proto != authproto) { 2302 /* not agreed, nak */ 2303 if (debug) 2304 addlog(" [mine %s != his %s]", 2305 sppp_proto_name(sp->hisauth.proto), 2306 sppp_proto_name(authproto)); 2307 p[2] = sp->myauth.proto >> 8; 2308 p[3] = sp->myauth.proto; 2309 break; 2310 } 2311 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2312 if (debug) 2313 addlog(" [chap not MD5]"); 2314 p[4] = CHAP_MD5; 2315 break; 2316 } 2317 continue; 2318 } 2319 /* Add the option to nak'ed list. */ 2320 bcopy (p, r, p[1]); 2321 r += p[1]; 2322 rlen += p[1]; 2323 } 2324 if (rlen) { 2325 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2326 if (debug) 2327 addlog(" max_failure (%d) exceeded, " 2328 "send conf-rej\n", 2329 sp->lcp.max_failure); 2330 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2331 } else { 2332 if (debug) 2333 addlog(" send conf-nak\n"); 2334 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2335 } 2336 goto end; 2337 } else { 2338 if (debug) 2339 addlog(" send conf-ack\n"); 2340 sp->fail_counter[IDX_LCP] = 0; 2341 sp->pp_loopcnt = 0; 2342 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2343 } 2344 2345 end: 2346 free(buf, M_TEMP); 2347 return (rlen == 0); 2348 } 2349 2350 /* 2351 * Analyze the LCP Configure-Reject option list, and adjust our 2352 * negotiation. 2353 */ 2354 static void 2355 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2356 { 2357 STDDCL; 2358 u_char *buf, *p; 2359 2360 len -= 4; 2361 buf = malloc (len, M_TEMP, M_NOWAIT); 2362 if (!buf) 2363 return; 2364 2365 if (debug) 2366 log(LOG_DEBUG, "%s: lcp rej opts:", 2367 ifp->if_xname); 2368 2369 p = (void *)(h + 1); 2370 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2371 if (debug) 2372 addlog(" %s", sppp_lcp_opt_name(*p)); 2373 switch (*p) { 2374 case LCP_OPT_MAGIC: 2375 /* Magic number -- can't use it, use 0 */ 2376 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2377 sp->lcp.magic = 0; 2378 break; 2379 case LCP_OPT_MRU: 2380 /* 2381 * Should not be rejected anyway, since we only 2382 * negotiate a MRU if explicitly requested by 2383 * peer. 2384 */ 2385 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2386 break; 2387 case LCP_OPT_AUTH_PROTO: 2388 /* 2389 * Peer doesn't want to authenticate himself, 2390 * deny unless this is a dialout call, and 2391 * SPPP_AUTHFLAG_NOCALLOUT is set. 2392 */ 2393 if ((sp->pp_flags & PP_CALLIN) == 0 && 2394 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2395 if (debug) 2396 addlog(" [don't insist on auth " 2397 "for callout]"); 2398 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2399 break; 2400 } 2401 if (debug) 2402 addlog("[access denied]\n"); 2403 lcp.Close(sp); 2404 break; 2405 } 2406 } 2407 if (debug) 2408 addlog("\n"); 2409 free(buf, M_TEMP); 2410 return; 2411 } 2412 2413 /* 2414 * Analyze the LCP Configure-NAK option list, and adjust our 2415 * negotiation. 2416 */ 2417 static void 2418 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2419 { 2420 STDDCL; 2421 u_char *buf, *p; 2422 u_int32_t magic; 2423 2424 len -= 4; 2425 buf = malloc (len, M_TEMP, M_NOWAIT); 2426 if (!buf) 2427 return; 2428 2429 if (debug) 2430 log(LOG_DEBUG, "%s: lcp nak opts:", 2431 ifp->if_xname); 2432 2433 p = (void *)(h + 1); 2434 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2435 if (debug) 2436 addlog(" %s", sppp_lcp_opt_name(*p)); 2437 switch (*p) { 2438 case LCP_OPT_MAGIC: 2439 /* Magic number -- renegotiate */ 2440 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2441 len >= 6 && p[1] == 6) { 2442 magic = (u_int32_t)p[2] << 24 | 2443 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2444 /* 2445 * If the remote magic is our negated one, 2446 * this looks like a loopback problem. 2447 * Suggest a new magic to make sure. 2448 */ 2449 if (magic == ~sp->lcp.magic) { 2450 if (debug) 2451 addlog(" magic glitch"); 2452 sp->lcp.magic = arc4random(); 2453 } else { 2454 sp->lcp.magic = magic; 2455 if (debug) 2456 addlog(" %d", magic); 2457 } 2458 } 2459 break; 2460 case LCP_OPT_MRU: 2461 /* 2462 * Peer wants to advise us to negotiate an MRU. 2463 * Agree on it if it's reasonable, or use 2464 * default otherwise. 2465 */ 2466 if (len >= 4 && p[1] == 4) { 2467 u_int mru = p[2] * 256 + p[3]; 2468 if (debug) 2469 addlog(" %d", mru); 2470 if (mru < PP_MTU || mru > PP_MAX_MRU) 2471 mru = PP_MTU; 2472 sp->lcp.mru = mru; 2473 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2474 } 2475 break; 2476 case LCP_OPT_AUTH_PROTO: 2477 /* 2478 * Peer doesn't like our authentication method, 2479 * deny. 2480 */ 2481 if (debug) 2482 addlog("[access denied]\n"); 2483 lcp.Close(sp); 2484 break; 2485 } 2486 } 2487 if (debug) 2488 addlog("\n"); 2489 free(buf, M_TEMP); 2490 return; 2491 } 2492 2493 static void 2494 sppp_lcp_tlu(struct sppp *sp) 2495 { 2496 STDDCL; 2497 int i; 2498 u_int32_t mask; 2499 2500 /* XXX ? */ 2501 if (! (ifp->if_flags & IFF_UP) && 2502 (ifp->if_flags & IFF_RUNNING)) { 2503 /* Coming out of loopback mode. */ 2504 if_up(ifp); 2505 } 2506 2507 for (i = 0; i < IDX_COUNT; i++) 2508 if ((cps[i])->flags & CP_QUAL) 2509 (cps[i])->Open(sp); 2510 2511 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2512 (sp->pp_flags & PP_NEEDAUTH) != 0) 2513 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2514 else 2515 sp->pp_phase = SPPP_PHASE_NETWORK; 2516 2517 if (debug) 2518 { 2519 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2520 sppp_phase_name(sp->pp_phase)); 2521 } 2522 2523 /* 2524 * Open all authentication protocols. This is even required 2525 * if we already proceeded to network phase, since it might be 2526 * that remote wants us to authenticate, so we might have to 2527 * send a PAP request. Undesired authentication protocols 2528 * don't do anything when they get an Open event. 2529 */ 2530 for (i = 0; i < IDX_COUNT; i++) 2531 if ((cps[i])->flags & CP_AUTH) 2532 (cps[i])->Open(sp); 2533 2534 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2535 /* Notify all NCPs. */ 2536 for (i = 0; i < IDX_COUNT; i++) 2537 if ((cps[i])->flags & CP_NCP) 2538 (cps[i])->Open(sp); 2539 } 2540 2541 /* Send Up events to all started protos. */ 2542 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2543 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2544 (cps[i])->Up(sp); 2545 2546 /* notify low-level driver of state change */ 2547 if (sp->pp_chg) 2548 sp->pp_chg(sp, (int)sp->pp_phase); 2549 2550 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2551 /* if no NCP is starting, close down */ 2552 sppp_lcp_check_and_close(sp); 2553 } 2554 2555 static void 2556 sppp_lcp_tld(struct sppp *sp) 2557 { 2558 STDDCL; 2559 int i; 2560 u_int32_t mask; 2561 2562 sp->pp_phase = SPPP_PHASE_TERMINATE; 2563 2564 if (debug) 2565 { 2566 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2567 sppp_phase_name(sp->pp_phase)); 2568 } 2569 2570 /* 2571 * Take upper layers down. We send the Down event first and 2572 * the Close second to prevent the upper layers from sending 2573 * ``a flurry of terminate-request packets'', as the RFC 2574 * describes it. 2575 */ 2576 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2577 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2578 (cps[i])->Down(sp); 2579 (cps[i])->Close(sp); 2580 } 2581 } 2582 2583 static void 2584 sppp_lcp_tls(struct sppp *sp) 2585 { 2586 STDDCL; 2587 2588 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2589 printf("%s: authentication failed %d times, not retrying again\n", 2590 sp->pp_if.if_xname, sp->pp_auth_failures); 2591 if_down(&sp->pp_if); 2592 return; 2593 } 2594 2595 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2596 2597 if (debug) 2598 { 2599 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2600 sppp_phase_name(sp->pp_phase)); 2601 } 2602 2603 /* Notify lower layer if desired. */ 2604 if (sp->pp_tls) 2605 (sp->pp_tls)(sp); 2606 } 2607 2608 static void 2609 sppp_lcp_tlf(struct sppp *sp) 2610 { 2611 STDDCL; 2612 2613 sp->pp_phase = SPPP_PHASE_DEAD; 2614 2615 if (debug) 2616 { 2617 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2618 sppp_phase_name(sp->pp_phase)); 2619 } 2620 2621 /* Notify lower layer if desired. */ 2622 if (sp->pp_tlf) 2623 (sp->pp_tlf)(sp); 2624 } 2625 2626 static void 2627 sppp_lcp_scr(struct sppp *sp) 2628 { 2629 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2630 int i = 0; 2631 u_short authproto; 2632 2633 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2634 if (! sp->lcp.magic) 2635 sp->lcp.magic = arc4random(); 2636 opt[i++] = LCP_OPT_MAGIC; 2637 opt[i++] = 6; 2638 opt[i++] = sp->lcp.magic >> 24; 2639 opt[i++] = sp->lcp.magic >> 16; 2640 opt[i++] = sp->lcp.magic >> 8; 2641 opt[i++] = sp->lcp.magic; 2642 } 2643 2644 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2645 opt[i++] = LCP_OPT_MRU; 2646 opt[i++] = 4; 2647 opt[i++] = sp->lcp.mru >> 8; 2648 opt[i++] = sp->lcp.mru; 2649 } 2650 2651 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2652 authproto = sp->hisauth.proto; 2653 opt[i++] = LCP_OPT_AUTH_PROTO; 2654 opt[i++] = authproto == PPP_CHAP? 5: 4; 2655 opt[i++] = authproto >> 8; 2656 opt[i++] = authproto; 2657 if (authproto == PPP_CHAP) 2658 opt[i++] = CHAP_MD5; 2659 } 2660 2661 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2662 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2663 } 2664 2665 /* 2666 * Check the open NCPs, return true if at least one NCP is open. 2667 */ 2668 static int 2669 sppp_ncp_check(struct sppp *sp) 2670 { 2671 int i, mask; 2672 2673 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2674 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2675 return 1; 2676 return 0; 2677 } 2678 2679 /* 2680 * Re-check the open NCPs and see if we should terminate the link. 2681 * Called by the NCPs during their tlf action handling. 2682 */ 2683 static void 2684 sppp_lcp_check_and_close(struct sppp *sp) 2685 { 2686 2687 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2688 /* don't bother, we are already going down */ 2689 return; 2690 2691 if (sppp_ncp_check(sp)) 2692 return; 2693 2694 lcp.Close(sp); 2695 } 2696 2697 2698 /* 2699 *--------------------------------------------------------------------------* 2700 * * 2701 * The IPCP implementation. * 2702 * * 2703 *--------------------------------------------------------------------------* 2704 */ 2705 2706 static void 2707 sppp_ipcp_init(struct sppp *sp) 2708 { 2709 sp->ipcp.opts = 0; 2710 sp->ipcp.flags = 0; 2711 sp->state[IDX_IPCP] = STATE_INITIAL; 2712 sp->fail_counter[IDX_IPCP] = 0; 2713 sp->pp_seq[IDX_IPCP] = 0; 2714 sp->pp_rseq[IDX_IPCP] = 0; 2715 callout_init(&sp->ch[IDX_IPCP]); 2716 } 2717 2718 static void 2719 sppp_ipcp_up(struct sppp *sp) 2720 { 2721 sppp_up_event(&ipcp, sp); 2722 } 2723 2724 static void 2725 sppp_ipcp_down(struct sppp *sp) 2726 { 2727 sppp_down_event(&ipcp, sp); 2728 } 2729 2730 static void 2731 sppp_ipcp_open(struct sppp *sp) 2732 { 2733 STDDCL; 2734 u_int32_t myaddr, hisaddr; 2735 2736 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2737 sp->ipcp.req_myaddr = 0; 2738 sp->ipcp.req_hisaddr = 0; 2739 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2740 2741 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2742 /* 2743 * If we don't have his address, this probably means our 2744 * interface doesn't want to talk IP at all. (This could 2745 * be the case if somebody wants to speak only IPX, for 2746 * example.) Don't open IPCP in this case. 2747 */ 2748 if (hisaddr == 0L) { 2749 /* XXX this message should go away */ 2750 if (debug) 2751 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2752 ifp->if_xname); 2753 return; 2754 } 2755 2756 if (myaddr == 0) { 2757 /* 2758 * I don't have an assigned address, so i need to 2759 * negotiate my address. 2760 */ 2761 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2762 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2763 } 2764 if (hisaddr == 1) { 2765 /* 2766 * XXX - remove this hack! 2767 * remote has no valid adress, we need to get one assigned. 2768 */ 2769 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2770 } 2771 sppp_open_event(&ipcp, sp); 2772 } 2773 2774 static void 2775 sppp_ipcp_close(struct sppp *sp) 2776 { 2777 STDDCL; 2778 2779 sppp_close_event(&ipcp, sp); 2780 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2781 /* 2782 * Some address was dynamic, clear it again. 2783 */ 2784 sppp_clear_ip_addrs(sp); 2785 2786 if (sp->pp_saved_mtu > 0) { 2787 ifp->if_mtu = sp->pp_saved_mtu; 2788 sp->pp_saved_mtu = 0; 2789 if (debug) 2790 log(LOG_DEBUG, 2791 "%s: resetting MTU to %" PRIu64 " bytes\n", 2792 ifp->if_xname, ifp->if_mtu); 2793 } 2794 } 2795 2796 static void 2797 sppp_ipcp_TO(void *cookie) 2798 { 2799 sppp_to_event(&ipcp, (struct sppp *)cookie); 2800 } 2801 2802 /* 2803 * Analyze a configure request. Return true if it was agreeable, and 2804 * caused action sca, false if it has been rejected or nak'ed, and 2805 * caused action scn. (The return value is used to make the state 2806 * transition decision in the state automaton.) 2807 */ 2808 static int 2809 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2810 { 2811 u_char *buf, *r, *p; 2812 struct ifnet *ifp = &sp->pp_if; 2813 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2814 u_int32_t hisaddr, desiredaddr; 2815 2816 len -= 4; 2817 origlen = len; 2818 /* 2819 * Make sure to allocate a buf that can at least hold a 2820 * conf-nak with an `address' option. We might need it below. 2821 */ 2822 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2823 if (! buf) 2824 return (0); 2825 2826 /* pass 1: see if we can recognize them */ 2827 if (debug) 2828 log(LOG_DEBUG, "%s: ipcp parse opts:", 2829 ifp->if_xname); 2830 p = (void *)(h + 1); 2831 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2832 if (debug) 2833 addlog(" %s", sppp_ipcp_opt_name(*p)); 2834 switch (*p) { 2835 #ifdef notyet 2836 case IPCP_OPT_COMPRESSION: 2837 if (len >= 6 && p[1] >= 6) { 2838 /* correctly formed compress option */ 2839 continue; 2840 } 2841 if (debug) 2842 addlog(" [invalid]"); 2843 break; 2844 #endif 2845 case IPCP_OPT_ADDRESS: 2846 if (len >= 6 && p[1] == 6) { 2847 /* correctly formed address option */ 2848 continue; 2849 } 2850 if (debug) 2851 addlog(" [invalid]"); 2852 break; 2853 default: 2854 /* Others not supported. */ 2855 if (debug) 2856 addlog(" [rej]"); 2857 break; 2858 } 2859 /* Add the option to rejected list. */ 2860 bcopy (p, r, p[1]); 2861 r += p[1]; 2862 rlen += p[1]; 2863 } 2864 if (rlen) { 2865 if (debug) 2866 addlog(" send conf-rej\n"); 2867 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2868 goto end; 2869 } else if (debug) 2870 addlog("\n"); 2871 2872 /* pass 2: parse option values */ 2873 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2874 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2875 else 2876 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2877 if (debug) 2878 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2879 ifp->if_xname); 2880 p = (void *)(h + 1); 2881 len = origlen; 2882 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2883 if (debug) 2884 addlog(" %s", sppp_ipcp_opt_name(*p)); 2885 switch (*p) { 2886 #ifdef notyet 2887 case IPCP_OPT_COMPRESSION: 2888 continue; 2889 #endif 2890 case IPCP_OPT_ADDRESS: 2891 desiredaddr = p[2] << 24 | p[3] << 16 | 2892 p[4] << 8 | p[5]; 2893 if (desiredaddr == hisaddr || 2894 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2895 /* 2896 * Peer's address is same as our value, 2897 * this is agreeable. Gonna conf-ack 2898 * it. 2899 */ 2900 if (debug) 2901 addlog(" %s [ack]", 2902 sppp_dotted_quad(hisaddr)); 2903 /* record that we've seen it already */ 2904 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2905 sp->ipcp.req_hisaddr = desiredaddr; 2906 hisaddr = desiredaddr; 2907 continue; 2908 } 2909 /* 2910 * The address wasn't agreeable. This is either 2911 * he sent us 0.0.0.0, asking to assign him an 2912 * address, or he send us another address not 2913 * matching our value. Either case, we gonna 2914 * conf-nak it with our value. 2915 */ 2916 if (debug) { 2917 if (desiredaddr == 0) 2918 addlog(" [addr requested]"); 2919 else 2920 addlog(" %s [not agreed]", 2921 sppp_dotted_quad(desiredaddr)); 2922 } 2923 2924 p[2] = hisaddr >> 24; 2925 p[3] = hisaddr >> 16; 2926 p[4] = hisaddr >> 8; 2927 p[5] = hisaddr; 2928 break; 2929 } 2930 /* Add the option to nak'ed list. */ 2931 bcopy (p, r, p[1]); 2932 r += p[1]; 2933 rlen += p[1]; 2934 } 2935 2936 /* 2937 * If we are about to conf-ack the request, but haven't seen 2938 * his address so far, gonna conf-nak it instead, with the 2939 * `address' option present and our idea of his address being 2940 * filled in there, to request negotiation of both addresses. 2941 * 2942 * XXX This can result in an endless req - nak loop if peer 2943 * doesn't want to send us his address. Q: What should we do 2944 * about it? XXX A: implement the max-failure counter. 2945 */ 2946 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2947 buf[0] = IPCP_OPT_ADDRESS; 2948 buf[1] = 6; 2949 buf[2] = hisaddr >> 24; 2950 buf[3] = hisaddr >> 16; 2951 buf[4] = hisaddr >> 8; 2952 buf[5] = hisaddr; 2953 rlen = 6; 2954 if (debug) 2955 addlog(" still need hisaddr"); 2956 } 2957 2958 if (rlen) { 2959 if (debug) 2960 addlog(" send conf-nak\n"); 2961 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2962 } else { 2963 if (debug) 2964 addlog(" send conf-ack\n"); 2965 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2966 } 2967 2968 end: 2969 free(buf, M_TEMP); 2970 return (rlen == 0); 2971 } 2972 2973 /* 2974 * Analyze the IPCP Configure-Reject option list, and adjust our 2975 * negotiation. 2976 */ 2977 static void 2978 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2979 { 2980 u_char *buf, *p; 2981 struct ifnet *ifp = &sp->pp_if; 2982 int debug = ifp->if_flags & IFF_DEBUG; 2983 2984 len -= 4; 2985 buf = malloc (len, M_TEMP, M_NOWAIT); 2986 if (!buf) 2987 return; 2988 2989 if (debug) 2990 log(LOG_DEBUG, "%s: ipcp rej opts:", 2991 ifp->if_xname); 2992 2993 p = (void *)(h + 1); 2994 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2995 if (debug) 2996 addlog(" %s", sppp_ipcp_opt_name(*p)); 2997 switch (*p) { 2998 case IPCP_OPT_ADDRESS: 2999 /* 3000 * Peer doesn't grok address option. This is 3001 * bad. XXX Should we better give up here? 3002 */ 3003 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3004 break; 3005 #ifdef notyet 3006 case IPCP_OPT_COMPRESS: 3007 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3008 break; 3009 #endif 3010 } 3011 } 3012 if (debug) 3013 addlog("\n"); 3014 free(buf, M_TEMP); 3015 return; 3016 } 3017 3018 /* 3019 * Analyze the IPCP Configure-NAK option list, and adjust our 3020 * negotiation. 3021 */ 3022 static void 3023 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3024 { 3025 u_char *p; 3026 struct ifnet *ifp = &sp->pp_if; 3027 int debug = ifp->if_flags & IFF_DEBUG; 3028 u_int32_t wantaddr; 3029 3030 len -= 4; 3031 3032 if (debug) 3033 log(LOG_DEBUG, "%s: ipcp nak opts:", 3034 ifp->if_xname); 3035 3036 p = (void *)(h + 1); 3037 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3038 if (debug) 3039 addlog(" %s", sppp_ipcp_opt_name(*p)); 3040 switch (*p) { 3041 case IPCP_OPT_ADDRESS: 3042 /* 3043 * Peer doesn't like our local IP address. See 3044 * if we can do something for him. We'll drop 3045 * him our address then. 3046 */ 3047 if (len >= 6 && p[1] == 6) { 3048 wantaddr = p[2] << 24 | p[3] << 16 | 3049 p[4] << 8 | p[5]; 3050 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3051 if (debug) 3052 addlog(" [wantaddr %s]", 3053 sppp_dotted_quad(wantaddr)); 3054 /* 3055 * When doing dynamic address assignment, 3056 * we accept his offer. Otherwise, we 3057 * ignore it and thus continue to negotiate 3058 * our already existing value. 3059 */ 3060 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3061 if (debug) 3062 addlog(" [agree]"); 3063 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3064 sp->ipcp.req_myaddr = wantaddr; 3065 } 3066 } 3067 break; 3068 3069 case IPCP_OPT_PRIMDNS: 3070 if (len >= 6 && p[1] == 6) { 3071 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3072 p[4] << 8 | p[5]; 3073 } 3074 break; 3075 3076 case IPCP_OPT_SECDNS: 3077 if (len >= 6 && p[1] == 6) { 3078 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3079 p[4] << 8 | p[5]; 3080 } 3081 break; 3082 #ifdef notyet 3083 case IPCP_OPT_COMPRESS: 3084 /* 3085 * Peer wants different compression parameters. 3086 */ 3087 break; 3088 #endif 3089 } 3090 } 3091 if (debug) 3092 addlog("\n"); 3093 return; 3094 } 3095 3096 static void 3097 sppp_ipcp_tlu(struct sppp *sp) 3098 { 3099 /* we are up. Set addresses and notify anyone interested */ 3100 STDDCL; 3101 u_int32_t myaddr, hisaddr; 3102 3103 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3104 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3105 myaddr = sp->ipcp.req_myaddr; 3106 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3107 hisaddr = sp->ipcp.req_hisaddr; 3108 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3109 3110 if (ifp->if_mtu > sp->lcp.their_mru) { 3111 sp->pp_saved_mtu = ifp->if_mtu; 3112 ifp->if_mtu = sp->lcp.their_mru; 3113 if (debug) 3114 log(LOG_DEBUG, 3115 "%s: setting MTU to %" PRIu64 " bytes\n", 3116 ifp->if_xname, ifp->if_mtu); 3117 } 3118 3119 if (sp->pp_con) 3120 sp->pp_con(sp); 3121 } 3122 3123 static void 3124 sppp_ipcp_tld(struct sppp *sp) 3125 { 3126 } 3127 3128 static void 3129 sppp_ipcp_tls(struct sppp *sp) 3130 { 3131 /* indicate to LCP that it must stay alive */ 3132 sp->lcp.protos |= (1 << IDX_IPCP); 3133 } 3134 3135 static void 3136 sppp_ipcp_tlf(struct sppp *sp) 3137 { 3138 /* we no longer need LCP */ 3139 sp->lcp.protos &= ~(1 << IDX_IPCP); 3140 } 3141 3142 static void 3143 sppp_ipcp_scr(struct sppp *sp) 3144 { 3145 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3146 u_int32_t ouraddr; 3147 int i = 0; 3148 3149 #ifdef notyet 3150 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3151 opt[i++] = IPCP_OPT_COMPRESSION; 3152 opt[i++] = 6; 3153 opt[i++] = 0; /* VJ header compression */ 3154 opt[i++] = 0x2d; /* VJ header compression */ 3155 opt[i++] = max_slot_id; 3156 opt[i++] = comp_slot_id; 3157 } 3158 #endif 3159 3160 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3161 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3162 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3163 else 3164 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3165 opt[i++] = IPCP_OPT_ADDRESS; 3166 opt[i++] = 6; 3167 opt[i++] = ouraddr >> 24; 3168 opt[i++] = ouraddr >> 16; 3169 opt[i++] = ouraddr >> 8; 3170 opt[i++] = ouraddr; 3171 } 3172 3173 if (sp->query_dns & 1) { 3174 opt[i++] = IPCP_OPT_PRIMDNS; 3175 opt[i++] = 6; 3176 opt[i++] = sp->dns_addrs[0] >> 24; 3177 opt[i++] = sp->dns_addrs[0] >> 16; 3178 opt[i++] = sp->dns_addrs[0] >> 8; 3179 opt[i++] = sp->dns_addrs[0]; 3180 } 3181 if (sp->query_dns & 2) { 3182 opt[i++] = IPCP_OPT_SECDNS; 3183 opt[i++] = 6; 3184 opt[i++] = sp->dns_addrs[1] >> 24; 3185 opt[i++] = sp->dns_addrs[1] >> 16; 3186 opt[i++] = sp->dns_addrs[1] >> 8; 3187 opt[i++] = sp->dns_addrs[1]; 3188 } 3189 3190 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3191 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3192 } 3193 3194 3195 /* 3196 *--------------------------------------------------------------------------* 3197 * * 3198 * The IPv6CP implementation. * 3199 * * 3200 *--------------------------------------------------------------------------* 3201 */ 3202 3203 #ifdef INET6 3204 static void 3205 sppp_ipv6cp_init(struct sppp *sp) 3206 { 3207 sp->ipv6cp.opts = 0; 3208 sp->ipv6cp.flags = 0; 3209 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3210 sp->fail_counter[IDX_IPV6CP] = 0; 3211 sp->pp_seq[IDX_IPV6CP] = 0; 3212 sp->pp_rseq[IDX_IPV6CP] = 0; 3213 callout_init(&sp->ch[IDX_IPV6CP]); 3214 } 3215 3216 static void 3217 sppp_ipv6cp_up(struct sppp *sp) 3218 { 3219 sppp_up_event(&ipv6cp, sp); 3220 } 3221 3222 static void 3223 sppp_ipv6cp_down(struct sppp *sp) 3224 { 3225 sppp_down_event(&ipv6cp, sp); 3226 } 3227 3228 static void 3229 sppp_ipv6cp_open(struct sppp *sp) 3230 { 3231 STDDCL; 3232 struct in6_addr myaddr, hisaddr; 3233 3234 #ifdef IPV6CP_MYIFID_DYN 3235 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3236 #else 3237 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3238 #endif 3239 3240 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3241 /* 3242 * If we don't have our address, this probably means our 3243 * interface doesn't want to talk IPv6 at all. (This could 3244 * be the case if somebody wants to speak only IPX, for 3245 * example.) Don't open IPv6CP in this case. 3246 */ 3247 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3248 /* XXX this message should go away */ 3249 if (debug) 3250 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3251 ifp->if_xname); 3252 return; 3253 } 3254 3255 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3256 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3257 sppp_open_event(&ipv6cp, sp); 3258 } 3259 3260 static void 3261 sppp_ipv6cp_close(struct sppp *sp) 3262 { 3263 sppp_close_event(&ipv6cp, sp); 3264 } 3265 3266 static void 3267 sppp_ipv6cp_TO(void *cookie) 3268 { 3269 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3270 } 3271 3272 /* 3273 * Analyze a configure request. Return true if it was agreeable, and 3274 * caused action sca, false if it has been rejected or nak'ed, and 3275 * caused action scn. (The return value is used to make the state 3276 * transition decision in the state automaton.) 3277 */ 3278 static int 3279 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3280 { 3281 u_char *buf, *r, *p; 3282 struct ifnet *ifp = &sp->pp_if; 3283 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3284 struct in6_addr myaddr, desiredaddr, suggestaddr; 3285 int ifidcount; 3286 int type; 3287 int collision, nohisaddr; 3288 3289 len -= 4; 3290 origlen = len; 3291 /* 3292 * Make sure to allocate a buf that can at least hold a 3293 * conf-nak with an `address' option. We might need it below. 3294 */ 3295 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3296 if (! buf) 3297 return (0); 3298 3299 /* pass 1: see if we can recognize them */ 3300 if (debug) 3301 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3302 ifp->if_xname); 3303 p = (void *)(h + 1); 3304 ifidcount = 0; 3305 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3306 if (debug) 3307 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3308 switch (*p) { 3309 case IPV6CP_OPT_IFID: 3310 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3311 /* correctly formed address option */ 3312 ifidcount++; 3313 continue; 3314 } 3315 if (debug) 3316 addlog(" [invalid]"); 3317 break; 3318 #ifdef notyet 3319 case IPV6CP_OPT_COMPRESSION: 3320 if (len >= 4 && p[1] >= 4) { 3321 /* correctly formed compress option */ 3322 continue; 3323 } 3324 if (debug) 3325 addlog(" [invalid]"); 3326 break; 3327 #endif 3328 default: 3329 /* Others not supported. */ 3330 if (debug) 3331 addlog(" [rej]"); 3332 break; 3333 } 3334 /* Add the option to rejected list. */ 3335 bcopy (p, r, p[1]); 3336 r += p[1]; 3337 rlen += p[1]; 3338 } 3339 if (rlen) { 3340 if (debug) 3341 addlog(" send conf-rej\n"); 3342 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3343 goto end; 3344 } else if (debug) 3345 addlog("\n"); 3346 3347 /* pass 2: parse option values */ 3348 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3349 if (debug) 3350 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3351 ifp->if_xname); 3352 p = (void *)(h + 1); 3353 len = origlen; 3354 type = CONF_ACK; 3355 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3356 if (debug) 3357 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3358 switch (*p) { 3359 #ifdef notyet 3360 case IPV6CP_OPT_COMPRESSION: 3361 continue; 3362 #endif 3363 case IPV6CP_OPT_IFID: 3364 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3365 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3366 collision = (memcmp(&desiredaddr.s6_addr[8], 3367 &myaddr.s6_addr[8], 8) == 0); 3368 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3369 3370 desiredaddr.s6_addr16[0] = htons(0xfe80); 3371 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3372 3373 if (!collision && !nohisaddr) { 3374 /* no collision, hisaddr known - Conf-Ack */ 3375 type = CONF_ACK; 3376 3377 if (debug) { 3378 addlog(" %s [%s]", 3379 ip6_sprintf(&desiredaddr), 3380 sppp_cp_type_name(type)); 3381 } 3382 continue; 3383 } 3384 3385 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3386 if (collision && nohisaddr) { 3387 /* collision, hisaddr unknown - Conf-Rej */ 3388 type = CONF_REJ; 3389 memset(&p[2], 0, 8); 3390 } else { 3391 /* 3392 * - no collision, hisaddr unknown, or 3393 * - collision, hisaddr known 3394 * Conf-Nak, suggest hisaddr 3395 */ 3396 type = CONF_NAK; 3397 sppp_suggest_ip6_addr(sp, &suggestaddr); 3398 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3399 } 3400 if (debug) 3401 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3402 sppp_cp_type_name(type)); 3403 break; 3404 } 3405 /* Add the option to nak'ed list. */ 3406 bcopy (p, r, p[1]); 3407 r += p[1]; 3408 rlen += p[1]; 3409 } 3410 3411 if (rlen == 0 && type == CONF_ACK) { 3412 if (debug) 3413 addlog(" send %s\n", sppp_cp_type_name(type)); 3414 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3415 } else { 3416 #ifdef notdef 3417 if (type == CONF_ACK) 3418 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3419 #endif 3420 3421 if (debug) { 3422 addlog(" send %s suggest %s\n", 3423 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3424 } 3425 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3426 } 3427 3428 end: 3429 free(buf, M_TEMP); 3430 return (rlen == 0); 3431 } 3432 3433 /* 3434 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3435 * negotiation. 3436 */ 3437 static void 3438 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3439 { 3440 u_char *buf, *p; 3441 struct ifnet *ifp = &sp->pp_if; 3442 int debug = ifp->if_flags & IFF_DEBUG; 3443 3444 len -= 4; 3445 buf = malloc (len, M_TEMP, M_NOWAIT); 3446 if (!buf) 3447 return; 3448 3449 if (debug) 3450 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3451 ifp->if_xname); 3452 3453 p = (void *)(h + 1); 3454 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3455 if (debug) 3456 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3457 switch (*p) { 3458 case IPV6CP_OPT_IFID: 3459 /* 3460 * Peer doesn't grok address option. This is 3461 * bad. XXX Should we better give up here? 3462 */ 3463 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3464 break; 3465 #ifdef notyet 3466 case IPV6CP_OPT_COMPRESS: 3467 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3468 break; 3469 #endif 3470 } 3471 } 3472 if (debug) 3473 addlog("\n"); 3474 free(buf, M_TEMP); 3475 return; 3476 } 3477 3478 /* 3479 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3480 * negotiation. 3481 */ 3482 static void 3483 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3484 { 3485 u_char *buf, *p; 3486 struct ifnet *ifp = &sp->pp_if; 3487 int debug = ifp->if_flags & IFF_DEBUG; 3488 struct in6_addr suggestaddr; 3489 3490 len -= 4; 3491 buf = malloc (len, M_TEMP, M_NOWAIT); 3492 if (!buf) 3493 return; 3494 3495 if (debug) 3496 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3497 ifp->if_xname); 3498 3499 p = (void *)(h + 1); 3500 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3501 if (debug) 3502 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3503 switch (*p) { 3504 case IPV6CP_OPT_IFID: 3505 /* 3506 * Peer doesn't like our local ifid. See 3507 * if we can do something for him. We'll drop 3508 * him our address then. 3509 */ 3510 if (len < 10 || p[1] != 10) 3511 break; 3512 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3513 suggestaddr.s6_addr16[0] = htons(0xfe80); 3514 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3515 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3516 3517 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3518 if (debug) 3519 addlog(" [suggestaddr %s]", 3520 ip6_sprintf(&suggestaddr)); 3521 #ifdef IPV6CP_MYIFID_DYN 3522 /* 3523 * When doing dynamic address assignment, 3524 * we accept his offer. 3525 */ 3526 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3527 struct in6_addr lastsuggest; 3528 /* 3529 * If <suggested myaddr from peer> equals to 3530 * <hisaddr we have suggested last time>, 3531 * we have a collision. generate new random 3532 * ifid. 3533 */ 3534 sppp_suggest_ip6_addr(&lastsuggest); 3535 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3536 lastsuggest)) { 3537 if (debug) 3538 addlog(" [random]"); 3539 sppp_gen_ip6_addr(sp, &suggestaddr); 3540 } 3541 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3542 if (debug) 3543 addlog(" [agree]"); 3544 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3545 } 3546 #else 3547 /* 3548 * Since we do not do dynamic address assignment, 3549 * we ignore it and thus continue to negotiate 3550 * our already existing value. This can possibly 3551 * go into infinite request-reject loop. 3552 * 3553 * This is not likely because we normally use 3554 * ifid based on MAC-address. 3555 * If you have no ethernet card on the node, too bad. 3556 * XXX should we use fail_counter? 3557 */ 3558 #endif 3559 break; 3560 #ifdef notyet 3561 case IPV6CP_OPT_COMPRESS: 3562 /* 3563 * Peer wants different compression parameters. 3564 */ 3565 break; 3566 #endif 3567 } 3568 } 3569 if (debug) 3570 addlog("\n"); 3571 free(buf, M_TEMP); 3572 return; 3573 } 3574 3575 static void 3576 sppp_ipv6cp_tlu(struct sppp *sp) 3577 { 3578 /* we are up - notify isdn daemon */ 3579 if (sp->pp_con) 3580 sp->pp_con(sp); 3581 } 3582 3583 static void 3584 sppp_ipv6cp_tld(struct sppp *sp) 3585 { 3586 } 3587 3588 static void 3589 sppp_ipv6cp_tls(struct sppp *sp) 3590 { 3591 /* indicate to LCP that it must stay alive */ 3592 sp->lcp.protos |= (1 << IDX_IPV6CP); 3593 } 3594 3595 static void 3596 sppp_ipv6cp_tlf(struct sppp *sp) 3597 { 3598 /* we no longer need LCP */ 3599 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3600 } 3601 3602 static void 3603 sppp_ipv6cp_scr(struct sppp *sp) 3604 { 3605 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3606 struct in6_addr ouraddr; 3607 int i = 0; 3608 3609 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3610 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3611 opt[i++] = IPV6CP_OPT_IFID; 3612 opt[i++] = 10; 3613 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3614 i += 8; 3615 } 3616 3617 #ifdef notyet 3618 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3619 opt[i++] = IPV6CP_OPT_COMPRESSION; 3620 opt[i++] = 4; 3621 opt[i++] = 0; /* TBD */ 3622 opt[i++] = 0; /* TBD */ 3623 /* variable length data may follow */ 3624 } 3625 #endif 3626 3627 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3628 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3629 } 3630 #else /*INET6*/ 3631 static void sppp_ipv6cp_init(struct sppp *sp) 3632 { 3633 } 3634 3635 static void sppp_ipv6cp_up(struct sppp *sp) 3636 { 3637 } 3638 3639 static void sppp_ipv6cp_down(struct sppp *sp) 3640 { 3641 } 3642 3643 3644 static void sppp_ipv6cp_open(struct sppp *sp) 3645 { 3646 } 3647 3648 static void sppp_ipv6cp_close(struct sppp *sp) 3649 { 3650 } 3651 3652 static void sppp_ipv6cp_TO(void *sp) 3653 { 3654 } 3655 3656 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3657 { 3658 return 0; 3659 } 3660 3661 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3662 { 3663 } 3664 3665 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3666 { 3667 } 3668 3669 static void sppp_ipv6cp_tlu(struct sppp *sp) 3670 { 3671 } 3672 3673 static void sppp_ipv6cp_tld(struct sppp *sp) 3674 { 3675 } 3676 3677 static void sppp_ipv6cp_tls(struct sppp *sp) 3678 { 3679 } 3680 3681 static void sppp_ipv6cp_tlf(struct sppp *sp) 3682 { 3683 } 3684 3685 static void sppp_ipv6cp_scr(struct sppp *sp) 3686 { 3687 } 3688 #endif /*INET6*/ 3689 3690 3691 /* 3692 *--------------------------------------------------------------------------* 3693 * * 3694 * The CHAP implementation. * 3695 * * 3696 *--------------------------------------------------------------------------* 3697 */ 3698 3699 /* 3700 * The authentication protocols don't employ a full-fledged state machine as 3701 * the control protocols do, since they do have Open and Close events, but 3702 * not Up and Down, nor are they explicitly terminated. Also, use of the 3703 * authentication protocols may be different in both directions (this makes 3704 * sense, think of a machine that never accepts incoming calls but only 3705 * calls out, it doesn't require the called party to authenticate itself). 3706 * 3707 * Our state machine for the local authentication protocol (we are requesting 3708 * the peer to authenticate) looks like: 3709 * 3710 * RCA- 3711 * +--------------------------------------------+ 3712 * V scn,tld| 3713 * +--------+ Close +---------+ RCA+ 3714 * | |<----------------------------------| |------+ 3715 * +--->| Closed | TO* | Opened | sca | 3716 * | | |-----+ +-------| |<-----+ 3717 * | +--------+ irc | | +---------+ 3718 * | ^ | | ^ 3719 * | | | | | 3720 * | | | | | 3721 * | TO-| | | | 3722 * | |tld TO+ V | | 3723 * | | +------->+ | | 3724 * | | | | | | 3725 * | +--------+ V | | 3726 * | | |<----+<--------------------+ | 3727 * | | Req- | scr | 3728 * | | Sent | | 3729 * | | | | 3730 * | +--------+ | 3731 * | RCA- | | RCA+ | 3732 * +------+ +------------------------------------------+ 3733 * scn,tld sca,irc,ict,tlu 3734 * 3735 * 3736 * with: 3737 * 3738 * Open: LCP reached authentication phase 3739 * Close: LCP reached terminate phase 3740 * 3741 * RCA+: received reply (pap-req, chap-response), acceptable 3742 * RCN: received reply (pap-req, chap-response), not acceptable 3743 * TO+: timeout with restart counter >= 0 3744 * TO-: timeout with restart counter < 0 3745 * TO*: reschedule timeout for CHAP 3746 * 3747 * scr: send request packet (none for PAP, chap-challenge) 3748 * sca: send ack packet (pap-ack, chap-success) 3749 * scn: send nak packet (pap-nak, chap-failure) 3750 * ict: initialize re-challenge timer (CHAP only) 3751 * 3752 * tlu: this-layer-up, LCP reaches network phase 3753 * tld: this-layer-down, LCP enters terminate phase 3754 * 3755 * Note that in CHAP mode, after sending a new challenge, while the state 3756 * automaton falls back into Req-Sent state, it doesn't signal a tld 3757 * event to LCP, so LCP remains in network phase. Only after not getting 3758 * any response (or after getting an unacceptable response), CHAP closes, 3759 * causing LCP to enter terminate phase. 3760 * 3761 * With PAP, there is no initial request that can be sent. The peer is 3762 * expected to send one based on the successful negotiation of PAP as 3763 * the authentication protocol during the LCP option negotiation. 3764 * 3765 * Incoming authentication protocol requests (remote requests 3766 * authentication, we are peer) don't employ a state machine at all, 3767 * they are simply answered. Some peers [Ascend P50 firmware rev 3768 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3769 * still in authentication phase (thereby violating the standard that 3770 * demands that these NCP packets are to be discarded), so we keep 3771 * track of the peer demanding us to authenticate, and only proceed to 3772 * phase network once we've seen a positive acknowledge for the 3773 * authentication. 3774 */ 3775 3776 /* 3777 * Handle incoming CHAP packets. 3778 */ 3779 void 3780 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3781 { 3782 STDDCL; 3783 struct lcp_header *h; 3784 int len, x; 3785 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3786 int value_len, name_len; 3787 MD5_CTX ctx; 3788 3789 len = m->m_pkthdr.len; 3790 if (len < 4) { 3791 if (debug) 3792 log(LOG_DEBUG, 3793 "%s: chap invalid packet length: %d bytes\n", 3794 ifp->if_xname, len); 3795 return; 3796 } 3797 h = mtod(m, struct lcp_header *); 3798 if (len > ntohs(h->len)) 3799 len = ntohs(h->len); 3800 3801 switch (h->type) { 3802 /* challenge, failure and success are his authproto */ 3803 case CHAP_CHALLENGE: 3804 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3805 /* can't do anything usefull */ 3806 sp->pp_auth_failures++; 3807 printf("%s: chap input without my name and my secret being set\n", 3808 ifp->if_xname); 3809 break; 3810 } 3811 value = 1 + (u_char *)(h + 1); 3812 value_len = value[-1]; 3813 name = value + value_len; 3814 name_len = len - value_len - 5; 3815 if (name_len < 0) { 3816 if (debug) { 3817 log(LOG_DEBUG, 3818 "%s: chap corrupted challenge " 3819 "<%s id=0x%x len=%d", 3820 ifp->if_xname, 3821 sppp_auth_type_name(PPP_CHAP, h->type), 3822 h->ident, ntohs(h->len)); 3823 if (len > 4) 3824 sppp_print_bytes((u_char *)(h + 1), 3825 len - 4); 3826 addlog(">\n"); 3827 } 3828 break; 3829 } 3830 3831 if (debug) { 3832 log(LOG_DEBUG, 3833 "%s: chap input <%s id=0x%x len=%d name=", 3834 ifp->if_xname, 3835 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3836 ntohs(h->len)); 3837 sppp_print_string((char *) name, name_len); 3838 addlog(" value-size=%d value=", value_len); 3839 sppp_print_bytes(value, value_len); 3840 addlog(">\n"); 3841 } 3842 3843 /* Compute reply value. */ 3844 MD5Init(&ctx); 3845 MD5Update(&ctx, &h->ident, 1); 3846 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3847 MD5Update(&ctx, value, value_len); 3848 MD5Final(digest, &ctx); 3849 dsize = sizeof digest; 3850 3851 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3852 sizeof dsize, (const char *)&dsize, 3853 sizeof digest, digest, 3854 sp->myauth.name_len, 3855 sp->myauth.name, 3856 0); 3857 break; 3858 3859 case CHAP_SUCCESS: 3860 if (debug) { 3861 log(LOG_DEBUG, "%s: chap success", 3862 ifp->if_xname); 3863 if (len > 4) { 3864 addlog(": "); 3865 sppp_print_string((char *)(h + 1), len - 4); 3866 } 3867 addlog("\n"); 3868 } 3869 x = splnet(); 3870 sp->pp_auth_failures = 0; 3871 sp->pp_flags &= ~PP_NEEDAUTH; 3872 if (sp->myauth.proto == PPP_CHAP && 3873 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3874 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3875 /* 3876 * We are authenticator for CHAP but didn't 3877 * complete yet. Leave it to tlu to proceed 3878 * to network phase. 3879 */ 3880 splx(x); 3881 break; 3882 } 3883 splx(x); 3884 sppp_phase_network(sp); 3885 break; 3886 3887 case CHAP_FAILURE: 3888 x = splnet(); 3889 sp->pp_auth_failures++; 3890 splx(x); 3891 if (debug) { 3892 log(LOG_INFO, "%s: chap failure", 3893 ifp->if_xname); 3894 if (len > 4) { 3895 addlog(": "); 3896 sppp_print_string((char *)(h + 1), len - 4); 3897 } 3898 addlog("\n"); 3899 } else 3900 log(LOG_INFO, "%s: chap failure\n", 3901 ifp->if_xname); 3902 /* await LCP shutdown by authenticator */ 3903 break; 3904 3905 /* response is my authproto */ 3906 case CHAP_RESPONSE: 3907 if (sp->hisauth.secret == NULL) { 3908 /* can't do anything usefull */ 3909 printf("%s: chap input without his secret being set\n", 3910 ifp->if_xname); 3911 break; 3912 } 3913 value = 1 + (u_char *)(h + 1); 3914 value_len = value[-1]; 3915 name = value + value_len; 3916 name_len = len - value_len - 5; 3917 if (name_len < 0) { 3918 if (debug) { 3919 log(LOG_DEBUG, 3920 "%s: chap corrupted response " 3921 "<%s id=0x%x len=%d", 3922 ifp->if_xname, 3923 sppp_auth_type_name(PPP_CHAP, h->type), 3924 h->ident, ntohs(h->len)); 3925 if (len > 4) 3926 sppp_print_bytes((u_char *)(h + 1), 3927 len - 4); 3928 addlog(">\n"); 3929 } 3930 break; 3931 } 3932 if (h->ident != sp->confid[IDX_CHAP]) { 3933 if (debug) 3934 log(LOG_DEBUG, 3935 "%s: chap dropping response for old ID " 3936 "(got %d, expected %d)\n", 3937 ifp->if_xname, 3938 h->ident, sp->confid[IDX_CHAP]); 3939 break; 3940 } 3941 if (sp->hisauth.name != NULL && 3942 (name_len != sp->hisauth.name_len 3943 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 3944 log(LOG_INFO, "%s: chap response, his name ", 3945 ifp->if_xname); 3946 sppp_print_string(name, name_len); 3947 addlog(" != expected "); 3948 sppp_print_string(sp->hisauth.name, 3949 sp->hisauth.name_len); 3950 addlog("\n"); 3951 goto chap_failure; 3952 } 3953 if (debug) { 3954 log(LOG_DEBUG, "%s: chap input(%s) " 3955 "<%s id=0x%x len=%d name=", 3956 ifp->if_xname, 3957 sppp_state_name(sp->state[IDX_CHAP]), 3958 sppp_auth_type_name(PPP_CHAP, h->type), 3959 h->ident, 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 if (value_len != sizeof(sp->myauth.challenge)) { 3966 if (debug) 3967 log(LOG_DEBUG, 3968 "%s: chap bad hash value length: " 3969 "%d bytes, should be %ld\n", 3970 ifp->if_xname, value_len, 3971 (long) sizeof(sp->myauth.challenge)); 3972 goto chap_failure; 3973 } 3974 3975 MD5Init(&ctx); 3976 MD5Update(&ctx, &h->ident, 1); 3977 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 3978 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 3979 MD5Final(digest, &ctx); 3980 3981 #define FAILMSG "Failed..." 3982 #define SUCCMSG "Welcome!" 3983 3984 if (value_len != sizeof digest || 3985 memcmp(digest, value, value_len) != 0) { 3986 chap_failure: 3987 /* action scn, tld */ 3988 x = splnet(); 3989 sp->pp_auth_failures++; 3990 splx(x); 3991 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3992 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3993 0); 3994 chap.tld(sp); 3995 break; 3996 } 3997 sp->pp_auth_failures = 0; 3998 /* action sca, perhaps tlu */ 3999 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4000 sp->state[IDX_CHAP] == STATE_OPENED) 4001 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4002 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4003 0); 4004 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4005 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4006 chap.tlu(sp); 4007 } 4008 break; 4009 4010 default: 4011 /* Unknown CHAP packet type -- ignore. */ 4012 if (debug) { 4013 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4014 "<0x%x id=0x%xh len=%d", 4015 ifp->if_xname, 4016 sppp_state_name(sp->state[IDX_CHAP]), 4017 h->type, h->ident, ntohs(h->len)); 4018 if (len > 4) 4019 sppp_print_bytes((u_char *)(h + 1), len - 4); 4020 addlog(">\n"); 4021 } 4022 break; 4023 4024 } 4025 } 4026 4027 static void 4028 sppp_chap_init(struct sppp *sp) 4029 { 4030 /* Chap doesn't have STATE_INITIAL at all. */ 4031 sp->state[IDX_CHAP] = STATE_CLOSED; 4032 sp->fail_counter[IDX_CHAP] = 0; 4033 sp->pp_seq[IDX_CHAP] = 0; 4034 sp->pp_rseq[IDX_CHAP] = 0; 4035 callout_init(&sp->ch[IDX_CHAP]); 4036 } 4037 4038 static void 4039 sppp_chap_open(struct sppp *sp) 4040 { 4041 if (sp->myauth.proto == PPP_CHAP && 4042 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4043 /* we are authenticator for CHAP, start it */ 4044 chap.scr(sp); 4045 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4046 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4047 } 4048 /* nothing to be done if we are peer, await a challenge */ 4049 } 4050 4051 static void 4052 sppp_chap_close(struct sppp *sp) 4053 { 4054 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4055 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4056 } 4057 4058 static void 4059 sppp_chap_TO(void *cookie) 4060 { 4061 struct sppp *sp = (struct sppp *)cookie; 4062 STDDCL; 4063 int s; 4064 4065 s = splnet(); 4066 if (debug) 4067 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4068 ifp->if_xname, 4069 sppp_state_name(sp->state[IDX_CHAP]), 4070 sp->rst_counter[IDX_CHAP]); 4071 4072 if (--sp->rst_counter[IDX_CHAP] < 0) 4073 /* TO- event */ 4074 switch (sp->state[IDX_CHAP]) { 4075 case STATE_REQ_SENT: 4076 chap.tld(sp); 4077 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4078 break; 4079 } 4080 else 4081 /* TO+ (or TO*) event */ 4082 switch (sp->state[IDX_CHAP]) { 4083 case STATE_OPENED: 4084 /* TO* event */ 4085 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4086 /* fall through */ 4087 case STATE_REQ_SENT: 4088 chap.scr(sp); 4089 /* sppp_cp_change_state() will restart the timer */ 4090 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4091 break; 4092 } 4093 4094 splx(s); 4095 } 4096 4097 static void 4098 sppp_chap_tlu(struct sppp *sp) 4099 { 4100 STDDCL; 4101 int i, x; 4102 4103 i = 0; 4104 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4105 4106 /* 4107 * Some broken CHAP implementations (Conware CoNet, firmware 4108 * 4.0.?) don't want to re-authenticate their CHAP once the 4109 * initial challenge-response exchange has taken place. 4110 * Provide for an option to avoid rechallenges. 4111 */ 4112 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4113 /* 4114 * Compute the re-challenge timeout. This will yield 4115 * a number between 300 and 810 seconds. 4116 */ 4117 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4118 4119 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4120 } 4121 4122 if (debug) { 4123 log(LOG_DEBUG, 4124 "%s: chap %s, ", 4125 ifp->if_xname, 4126 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4127 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4128 addlog("next re-challenge in %d seconds\n", i); 4129 else 4130 addlog("re-challenging supressed\n"); 4131 } 4132 4133 x = splnet(); 4134 sp->pp_auth_failures = 0; 4135 /* indicate to LCP that we need to be closed down */ 4136 sp->lcp.protos |= (1 << IDX_CHAP); 4137 4138 if (sp->pp_flags & PP_NEEDAUTH) { 4139 /* 4140 * Remote is authenticator, but his auth proto didn't 4141 * complete yet. Defer the transition to network 4142 * phase. 4143 */ 4144 splx(x); 4145 return; 4146 } 4147 splx(x); 4148 4149 /* 4150 * If we are already in phase network, we are done here. This 4151 * is the case if this is a dummy tlu event after a re-challenge. 4152 */ 4153 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4154 sppp_phase_network(sp); 4155 } 4156 4157 static void 4158 sppp_chap_tld(struct sppp *sp) 4159 { 4160 STDDCL; 4161 4162 if (debug) 4163 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4164 callout_stop(&sp->ch[IDX_CHAP]); 4165 sp->lcp.protos &= ~(1 << IDX_CHAP); 4166 4167 lcp.Close(sp); 4168 } 4169 4170 static void 4171 sppp_chap_scr(struct sppp *sp) 4172 { 4173 u_int32_t *ch; 4174 u_char clen; 4175 4176 if (sp->myauth.name == NULL) { 4177 /* can't do anything usefull */ 4178 printf("%s: chap starting without my name being set\n", 4179 sp->pp_if.if_xname); 4180 return; 4181 } 4182 4183 /* Compute random challenge. */ 4184 ch = (u_int32_t *)sp->myauth.challenge; 4185 ch[0] = arc4random(); 4186 ch[1] = arc4random(); 4187 ch[2] = arc4random(); 4188 ch[3] = arc4random(); 4189 clen = 16; /* 4 * sizeof(u_int32_t) */ 4190 4191 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4192 4193 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4194 sizeof clen, (const char *)&clen, 4195 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4196 sp->myauth.name_len, 4197 sp->myauth.name, 4198 0); 4199 } 4200 4201 /* 4202 *--------------------------------------------------------------------------* 4203 * * 4204 * The PAP implementation. * 4205 * * 4206 *--------------------------------------------------------------------------* 4207 */ 4208 /* 4209 * For PAP, we need to keep a little state also if we are the peer, not the 4210 * authenticator. This is since we don't get a request to authenticate, but 4211 * have to repeatedly authenticate ourself until we got a response (or the 4212 * retry counter is expired). 4213 */ 4214 4215 /* 4216 * Handle incoming PAP packets. */ 4217 static void 4218 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4219 { 4220 STDDCL; 4221 struct lcp_header *h; 4222 int len, x; 4223 u_char mlen; 4224 char *name, *secret; 4225 int name_len, secret_len; 4226 4227 len = m->m_pkthdr.len; 4228 if (len < 5) { 4229 if (debug) 4230 log(LOG_DEBUG, 4231 "%s: pap invalid packet length: %d bytes\n", 4232 ifp->if_xname, len); 4233 return; 4234 } 4235 h = mtod(m, struct lcp_header *); 4236 if (len > ntohs(h->len)) 4237 len = ntohs(h->len); 4238 switch (h->type) { 4239 /* PAP request is my authproto */ 4240 case PAP_REQ: 4241 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4242 /* can't do anything usefull */ 4243 printf("%s: pap request without his name and his secret being set\n", 4244 ifp->if_xname); 4245 break; 4246 } 4247 name = 1 + (u_char *)(h + 1); 4248 name_len = name[-1]; 4249 secret = name + name_len + 1; 4250 if (name_len > len - 6 || 4251 (secret_len = secret[-1]) > len - 6 - name_len) { 4252 if (debug) { 4253 log(LOG_DEBUG, "%s: pap corrupted input " 4254 "<%s id=0x%x len=%d", 4255 ifp->if_xname, 4256 sppp_auth_type_name(PPP_PAP, h->type), 4257 h->ident, ntohs(h->len)); 4258 if (len > 4) 4259 sppp_print_bytes((u_char *)(h + 1), 4260 len - 4); 4261 addlog(">\n"); 4262 } 4263 break; 4264 } 4265 if (debug) { 4266 log(LOG_DEBUG, "%s: pap input(%s) " 4267 "<%s id=0x%x len=%d name=", 4268 ifp->if_xname, 4269 sppp_state_name(sp->state[IDX_PAP]), 4270 sppp_auth_type_name(PPP_PAP, h->type), 4271 h->ident, ntohs(h->len)); 4272 sppp_print_string((char *)name, name_len); 4273 addlog(" secret="); 4274 sppp_print_string((char *)secret, secret_len); 4275 addlog(">\n"); 4276 } 4277 if (name_len != sp->hisauth.name_len || 4278 secret_len != sp->hisauth.secret_len || 4279 memcmp(name, sp->hisauth.name, name_len) != 0 || 4280 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4281 /* action scn, tld */ 4282 sp->pp_auth_failures++; 4283 mlen = sizeof(FAILMSG) - 1; 4284 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4285 sizeof mlen, (const char *)&mlen, 4286 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4287 0); 4288 pap.tld(sp); 4289 break; 4290 } 4291 /* action sca, perhaps tlu */ 4292 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4293 sp->state[IDX_PAP] == STATE_OPENED) { 4294 mlen = sizeof(SUCCMSG) - 1; 4295 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4296 sizeof mlen, (const char *)&mlen, 4297 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4298 0); 4299 } 4300 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4301 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4302 pap.tlu(sp); 4303 } 4304 break; 4305 4306 /* ack and nak are his authproto */ 4307 case PAP_ACK: 4308 callout_stop(&sp->pap_my_to_ch); 4309 if (debug) { 4310 log(LOG_DEBUG, "%s: pap success", 4311 ifp->if_xname); 4312 name_len = *(char *)h; 4313 if (len > 5 && name_len) { 4314 addlog(": "); 4315 sppp_print_string((char *)(h + 1), name_len); 4316 } 4317 addlog("\n"); 4318 } 4319 x = splnet(); 4320 sp->pp_auth_failures = 0; 4321 sp->pp_flags &= ~PP_NEEDAUTH; 4322 if (sp->myauth.proto == PPP_PAP && 4323 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4324 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4325 /* 4326 * We are authenticator for PAP but didn't 4327 * complete yet. Leave it to tlu to proceed 4328 * to network phase. 4329 */ 4330 splx(x); 4331 break; 4332 } 4333 splx(x); 4334 sppp_phase_network(sp); 4335 break; 4336 4337 case PAP_NAK: 4338 callout_stop(&sp->pap_my_to_ch); 4339 sp->pp_auth_failures++; 4340 if (debug) { 4341 log(LOG_INFO, "%s: pap failure", 4342 ifp->if_xname); 4343 name_len = *(char *)h; 4344 if (len > 5 && name_len) { 4345 addlog(": "); 4346 sppp_print_string((char *)(h + 1), name_len); 4347 } 4348 addlog("\n"); 4349 } else 4350 log(LOG_INFO, "%s: pap failure\n", 4351 ifp->if_xname); 4352 /* await LCP shutdown by authenticator */ 4353 break; 4354 4355 default: 4356 /* Unknown PAP packet type -- ignore. */ 4357 if (debug) { 4358 log(LOG_DEBUG, "%s: pap corrupted input " 4359 "<0x%x id=0x%x len=%d", 4360 ifp->if_xname, 4361 h->type, h->ident, ntohs(h->len)); 4362 if (len > 4) 4363 sppp_print_bytes((u_char *)(h + 1), len - 4); 4364 addlog(">\n"); 4365 } 4366 break; 4367 4368 } 4369 } 4370 4371 static void 4372 sppp_pap_init(struct sppp *sp) 4373 { 4374 /* PAP doesn't have STATE_INITIAL at all. */ 4375 sp->state[IDX_PAP] = STATE_CLOSED; 4376 sp->fail_counter[IDX_PAP] = 0; 4377 sp->pp_seq[IDX_PAP] = 0; 4378 sp->pp_rseq[IDX_PAP] = 0; 4379 callout_init(&sp->ch[IDX_PAP]); 4380 callout_init(&sp->pap_my_to_ch); 4381 } 4382 4383 static void 4384 sppp_pap_open(struct sppp *sp) 4385 { 4386 if (sp->hisauth.proto == PPP_PAP && 4387 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4388 /* we are authenticator for PAP, start our timer */ 4389 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4390 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4391 } 4392 if (sp->myauth.proto == PPP_PAP) { 4393 /* we are peer, send a request, and start a timer */ 4394 pap.scr(sp); 4395 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4396 sppp_pap_my_TO, sp); 4397 } 4398 } 4399 4400 static void 4401 sppp_pap_close(struct sppp *sp) 4402 { 4403 if (sp->state[IDX_PAP] != STATE_CLOSED) 4404 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4405 } 4406 4407 /* 4408 * That's the timeout routine if we are authenticator. Since the 4409 * authenticator is basically passive in PAP, we can't do much here. 4410 */ 4411 static void 4412 sppp_pap_TO(void *cookie) 4413 { 4414 struct sppp *sp = (struct sppp *)cookie; 4415 STDDCL; 4416 int s; 4417 4418 s = splnet(); 4419 if (debug) 4420 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4421 ifp->if_xname, 4422 sppp_state_name(sp->state[IDX_PAP]), 4423 sp->rst_counter[IDX_PAP]); 4424 4425 if (--sp->rst_counter[IDX_PAP] < 0) 4426 /* TO- event */ 4427 switch (sp->state[IDX_PAP]) { 4428 case STATE_REQ_SENT: 4429 pap.tld(sp); 4430 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4431 break; 4432 } 4433 else 4434 /* TO+ event, not very much we could do */ 4435 switch (sp->state[IDX_PAP]) { 4436 case STATE_REQ_SENT: 4437 /* sppp_cp_change_state() will restart the timer */ 4438 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4439 break; 4440 } 4441 4442 splx(s); 4443 } 4444 4445 /* 4446 * That's the timeout handler if we are peer. Since the peer is active, 4447 * we need to retransmit our PAP request since it is apparently lost. 4448 * XXX We should impose a max counter. 4449 */ 4450 static void 4451 sppp_pap_my_TO(void *cookie) 4452 { 4453 struct sppp *sp = (struct sppp *)cookie; 4454 STDDCL; 4455 4456 if (debug) 4457 log(LOG_DEBUG, "%s: pap peer TO\n", 4458 ifp->if_xname); 4459 4460 pap.scr(sp); 4461 } 4462 4463 static void 4464 sppp_pap_tlu(struct sppp *sp) 4465 { 4466 STDDCL; 4467 int x; 4468 4469 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4470 4471 if (debug) 4472 log(LOG_DEBUG, "%s: %s tlu\n", 4473 ifp->if_xname, pap.name); 4474 4475 x = splnet(); 4476 sp->pp_auth_failures = 0; 4477 /* indicate to LCP that we need to be closed down */ 4478 sp->lcp.protos |= (1 << IDX_PAP); 4479 4480 if (sp->pp_flags & PP_NEEDAUTH) { 4481 /* 4482 * Remote is authenticator, but his auth proto didn't 4483 * complete yet. Defer the transition to network 4484 * phase. 4485 */ 4486 splx(x); 4487 return; 4488 } 4489 splx(x); 4490 sppp_phase_network(sp); 4491 } 4492 4493 static void 4494 sppp_pap_tld(struct sppp *sp) 4495 { 4496 STDDCL; 4497 4498 if (debug) 4499 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4500 callout_stop(&sp->ch[IDX_PAP]); 4501 callout_stop(&sp->pap_my_to_ch); 4502 sp->lcp.protos &= ~(1 << IDX_PAP); 4503 4504 lcp.Close(sp); 4505 } 4506 4507 static void 4508 sppp_pap_scr(struct sppp *sp) 4509 { 4510 u_char idlen, pwdlen; 4511 4512 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4513 /* can't do anything usefull */ 4514 printf("%s: pap starting without my name and secret being set\n", 4515 sp->pp_if.if_xname); 4516 return; 4517 } 4518 4519 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4520 pwdlen = sp->myauth.secret_len; 4521 idlen = sp->myauth.name_len; 4522 4523 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4524 sizeof idlen, (const char *)&idlen, 4525 idlen, sp->myauth.name, 4526 sizeof pwdlen, (const char *)&pwdlen, 4527 pwdlen, sp->myauth.secret, 4528 0); 4529 } 4530 4531 /* 4532 * Random miscellaneous functions. 4533 */ 4534 4535 /* 4536 * Send a PAP or CHAP proto packet. 4537 * 4538 * Varadic function, each of the elements for the ellipsis is of type 4539 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4540 * mlen == 0. 4541 * NOTE: never declare variadic functions with types subject to type 4542 * promotion (i.e. u_char). This is asking for big trouble depending 4543 * on the architecture you are on... 4544 */ 4545 4546 static void 4547 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4548 unsigned int type, unsigned int id, 4549 ...) 4550 { 4551 STDDCL; 4552 struct lcp_header *lh; 4553 struct mbuf *m; 4554 u_char *p; 4555 int len; 4556 size_t pkthdrlen; 4557 unsigned int mlen; 4558 const char *msg; 4559 va_list ap; 4560 4561 MGETHDR(m, M_DONTWAIT, MT_DATA); 4562 if (! m) 4563 return; 4564 m->m_pkthdr.rcvif = 0; 4565 4566 if (sp->pp_flags & PP_NOFRAMING) { 4567 *mtod(m, u_int16_t *) = htons(cp->proto); 4568 pkthdrlen = 2; 4569 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4570 } else { 4571 struct ppp_header *h; 4572 h = mtod(m, struct ppp_header *); 4573 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4574 h->control = PPP_UI; /* Unnumbered Info */ 4575 h->protocol = htons(cp->proto); 4576 pkthdrlen = PPP_HEADER_LEN; 4577 4578 lh = (struct lcp_header *)(h + 1); 4579 } 4580 4581 lh->type = type; 4582 lh->ident = id; 4583 p = (u_char *)(lh + 1); 4584 4585 va_start(ap, id); 4586 len = 0; 4587 4588 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4589 msg = va_arg(ap, const char *); 4590 len += mlen; 4591 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4592 va_end(ap); 4593 m_freem(m); 4594 return; 4595 } 4596 4597 bcopy(msg, p, mlen); 4598 p += mlen; 4599 } 4600 va_end(ap); 4601 4602 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4603 lh->len = htons(LCP_HEADER_LEN + len); 4604 4605 if (debug) { 4606 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4607 ifp->if_xname, cp->name, 4608 sppp_auth_type_name(cp->proto, lh->type), 4609 lh->ident, ntohs(lh->len)); 4610 if (len) 4611 sppp_print_bytes((u_char *)(lh + 1), len); 4612 addlog(">\n"); 4613 } 4614 if (IF_QFULL(&sp->pp_cpq)) { 4615 IF_DROP(&sp->pp_fastq); 4616 IF_DROP(&ifp->if_snd); 4617 m_freem(m); 4618 ++ifp->if_oerrors; 4619 return; 4620 } else 4621 IF_ENQUEUE(&sp->pp_cpq, m); 4622 if (! (ifp->if_flags & IFF_OACTIVE)) 4623 (*ifp->if_start)(ifp); 4624 ifp->if_obytes += m->m_pkthdr.len + 3; 4625 } 4626 4627 /* 4628 * Send keepalive packets, every 10 seconds. 4629 */ 4630 static void 4631 sppp_keepalive(void *dummy) 4632 { 4633 struct sppp *sp; 4634 int s; 4635 time_t now; 4636 4637 s = splnet(); 4638 now = mono_time.tv_sec; 4639 for (sp=spppq; sp; sp=sp->pp_next) { 4640 struct ifnet *ifp = &sp->pp_if; 4641 4642 /* check idle timeout */ 4643 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4644 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4645 /* idle timeout is enabled for this interface */ 4646 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4647 if (ifp->if_flags & IFF_DEBUG) 4648 printf("%s: no activitiy for %lu seconds\n", 4649 sp->pp_if.if_xname, 4650 (unsigned long)(now-sp->pp_last_activity)); 4651 lcp.Close(sp); 4652 continue; 4653 } 4654 } 4655 4656 /* Keepalive mode disabled or channel down? */ 4657 if (! (sp->pp_flags & PP_KEEPALIVE) || 4658 ! (ifp->if_flags & IFF_RUNNING)) 4659 continue; 4660 4661 /* No keepalive in PPP mode if LCP not opened yet. */ 4662 if (! (sp->pp_flags & PP_CISCO) && 4663 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4664 continue; 4665 4666 /* No echo reply, but maybe user data passed through? */ 4667 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4668 sp->pp_alivecnt = 0; 4669 continue; 4670 } 4671 4672 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4673 /* No keepalive packets got. Stop the interface. */ 4674 if_down (ifp); 4675 IF_PURGE(&sp->pp_cpq); 4676 if (! (sp->pp_flags & PP_CISCO)) { 4677 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4678 ifp->if_xname); 4679 sp->pp_alivecnt = 0; 4680 4681 /* we are down, close all open protocols */ 4682 lcp.Close(sp); 4683 4684 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4685 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4686 4687 /* Close connection imediatly, completition of this 4688 * will summon the magic needed to reestablish it. */ 4689 sp->pp_tlf(sp); 4690 continue; 4691 } 4692 } 4693 if (sp->pp_alivecnt < sp->pp_maxalive) 4694 ++sp->pp_alivecnt; 4695 if (sp->pp_flags & PP_CISCO) 4696 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4697 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4698 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4699 int32_t nmagic = htonl(sp->lcp.magic); 4700 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4701 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4702 sp->lcp.echoid, 4, &nmagic); 4703 } 4704 } 4705 splx(s); 4706 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4707 } 4708 4709 /* 4710 * Get both IP addresses. 4711 */ 4712 static void 4713 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4714 { 4715 struct ifnet *ifp = &sp->pp_if; 4716 struct ifaddr *ifa; 4717 struct sockaddr_in *si, *sm; 4718 u_int32_t ssrc, ddst; 4719 4720 sm = NULL; 4721 ssrc = ddst = 0; 4722 /* 4723 * Pick the first AF_INET address from the list, 4724 * aliases don't make any sense on a p2p link anyway. 4725 */ 4726 si = 0; 4727 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4728 if (ifa->ifa_addr->sa_family == AF_INET) { 4729 si = (struct sockaddr_in *)ifa->ifa_addr; 4730 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4731 if (si) 4732 break; 4733 } 4734 } 4735 if (ifa) { 4736 if (si && si->sin_addr.s_addr) { 4737 ssrc = si->sin_addr.s_addr; 4738 if (srcmask) 4739 *srcmask = ntohl(sm->sin_addr.s_addr); 4740 } 4741 4742 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4743 if (si && si->sin_addr.s_addr) 4744 ddst = si->sin_addr.s_addr; 4745 } 4746 4747 if (dst) *dst = ntohl(ddst); 4748 if (src) *src = ntohl(ssrc); 4749 } 4750 4751 /* 4752 * Set IP addresses. Must be called at splnet. 4753 * If an address is 0, leave it the way it is. 4754 */ 4755 static void 4756 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4757 { 4758 STDDCL; 4759 struct ifaddr *ifa; 4760 struct sockaddr_in *si; 4761 struct sockaddr_in *dest; 4762 4763 /* 4764 * Pick the first AF_INET address from the list, 4765 * aliases don't make any sense on a p2p link anyway. 4766 */ 4767 4768 si = 0; 4769 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4770 { 4771 if (ifa->ifa_addr->sa_family == AF_INET) 4772 { 4773 si = (struct sockaddr_in *)ifa->ifa_addr; 4774 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4775 if (si) 4776 break; 4777 } 4778 } 4779 4780 if (ifa && si) 4781 { 4782 int error; 4783 struct sockaddr_in new_sin = *si; 4784 struct sockaddr_in new_dst = *dest; 4785 4786 /* 4787 * Scrub old routes now instead of calling in_ifinit with 4788 * scrub=1, because we may change the dstaddr 4789 * before the call to in_ifinit. 4790 */ 4791 in_ifscrub(ifp, ifatoia(ifa)); 4792 4793 if (myaddr != 0) 4794 new_sin.sin_addr.s_addr = htonl(myaddr); 4795 if (hisaddr != 0) { 4796 new_dst.sin_addr.s_addr = htonl(hisaddr); 4797 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4798 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4799 *dest = new_dst; /* fix dstaddr in place */ 4800 } 4801 } 4802 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4803 if (debug && error) 4804 { 4805 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4806 " failed, error=%d\n", ifp->if_xname, error); 4807 } 4808 } 4809 } 4810 4811 /* 4812 * Clear IP addresses. Must be called at splnet. 4813 */ 4814 static void 4815 sppp_clear_ip_addrs(struct sppp *sp) 4816 { 4817 struct ifnet *ifp = &sp->pp_if; 4818 struct ifaddr *ifa; 4819 struct sockaddr_in *si; 4820 struct sockaddr_in *dest; 4821 4822 u_int32_t remote; 4823 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4824 remote = sp->ipcp.saved_hisaddr; 4825 else 4826 sppp_get_ip_addrs(sp, 0, &remote, 0); 4827 4828 /* 4829 * Pick the first AF_INET address from the list, 4830 * aliases don't make any sense on a p2p link anyway. 4831 */ 4832 4833 si = 0; 4834 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4835 { 4836 if (ifa->ifa_addr->sa_family == AF_INET) 4837 { 4838 si = (struct sockaddr_in *)ifa->ifa_addr; 4839 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4840 if (si) 4841 break; 4842 } 4843 } 4844 4845 if (ifa && si) 4846 { 4847 struct sockaddr_in new_sin = *si; 4848 4849 in_ifscrub(ifp, ifatoia(ifa)); 4850 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4851 new_sin.sin_addr.s_addr = 0; 4852 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4853 /* replace peer addr in place */ 4854 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4855 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4856 } 4857 } 4858 4859 #ifdef INET6 4860 /* 4861 * Get both IPv6 addresses. 4862 */ 4863 static void 4864 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4865 struct in6_addr *srcmask) 4866 { 4867 struct ifnet *ifp = &sp->pp_if; 4868 struct ifaddr *ifa; 4869 struct sockaddr_in6 *si, *sm; 4870 struct in6_addr ssrc, ddst; 4871 4872 sm = NULL; 4873 memset(&ssrc, 0, sizeof(ssrc)); 4874 memset(&ddst, 0, sizeof(ddst)); 4875 /* 4876 * Pick the first link-local AF_INET6 address from the list, 4877 * aliases don't make any sense on a p2p link anyway. 4878 */ 4879 si = 0; 4880 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4881 if (ifa->ifa_addr->sa_family == AF_INET6) { 4882 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4883 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4884 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4885 break; 4886 } 4887 if (ifa) { 4888 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4889 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4890 if (srcmask) { 4891 bcopy(&sm->sin6_addr, srcmask, 4892 sizeof(*srcmask)); 4893 } 4894 } 4895 4896 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4897 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4898 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4899 } 4900 4901 if (dst) 4902 bcopy(&ddst, dst, sizeof(*dst)); 4903 if (src) 4904 bcopy(&ssrc, src, sizeof(*src)); 4905 } 4906 4907 #ifdef IPV6CP_MYIFID_DYN 4908 /* 4909 * Generate random ifid. 4910 */ 4911 static void 4912 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4913 { 4914 /* TBD */ 4915 } 4916 4917 /* 4918 * Set my IPv6 address. Must be called at splnet. 4919 */ 4920 static void 4921 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4922 { 4923 STDDCL; 4924 struct ifaddr *ifa; 4925 struct sockaddr_in6 *sin6; 4926 4927 /* 4928 * Pick the first link-local AF_INET6 address from the list, 4929 * aliases don't make any sense on a p2p link anyway. 4930 */ 4931 4932 sin6 = NULL; 4933 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4934 { 4935 if (ifa->ifa_addr->sa_family == AF_INET6) 4936 { 4937 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4938 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4939 break; 4940 } 4941 } 4942 4943 if (ifa && sin6) 4944 { 4945 int error; 4946 struct sockaddr_in6 new_sin6 = *sin6; 4947 4948 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4949 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4950 if (debug && error) 4951 { 4952 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 4953 " failed, error=%d\n", ifp->if_xname, error); 4954 } 4955 } 4956 } 4957 #endif 4958 4959 /* 4960 * Suggest a candidate address to be used by peer. 4961 */ 4962 static void 4963 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4964 { 4965 struct in6_addr myaddr; 4966 struct timeval tv; 4967 4968 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4969 4970 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4971 microtime(&tv); 4972 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4973 myaddr.s6_addr[14] ^= 0xff; 4974 myaddr.s6_addr[15] ^= 0xff; 4975 } else { 4976 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4977 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4978 } 4979 if (suggest) 4980 bcopy(&myaddr, suggest, sizeof(myaddr)); 4981 } 4982 #endif /*INET6*/ 4983 4984 /* 4985 * Process ioctl requests specific to the PPP interface. 4986 * Permissions have already been checked. 4987 */ 4988 static int 4989 sppp_params(struct sppp *sp, int cmd, void *data) 4990 { 4991 switch (cmd) { 4992 case SPPPGETAUTHCFG: 4993 { 4994 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 4995 int error; 4996 size_t len; 4997 4998 cfg->myauthflags = sp->myauth.flags; 4999 cfg->hisauthflags = sp->hisauth.flags; 5000 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5001 cfg->hisauth = 0; 5002 if (sp->hisauth.proto) 5003 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5004 cfg->myauth = 0; 5005 if (sp->myauth.proto) 5006 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5007 if (cfg->myname_length == 0) { 5008 if (sp->myauth.name != NULL) 5009 cfg->myname_length = sp->myauth.name_len + 1; 5010 } else { 5011 if (sp->myauth.name == NULL) { 5012 cfg->myname_length = 0; 5013 } else { 5014 len = sp->myauth.name_len + 1; 5015 if (cfg->myname_length < len) 5016 return (ENAMETOOLONG); 5017 error = copyout(sp->myauth.name, cfg->myname, len); 5018 if (error) return error; 5019 } 5020 } 5021 if (cfg->hisname_length == 0) { 5022 if (sp->hisauth.name != NULL) 5023 cfg->hisname_length = sp->hisauth.name_len + 1; 5024 } else { 5025 if (sp->hisauth.name == NULL) { 5026 cfg->hisname_length = 0; 5027 } else { 5028 len = sp->hisauth.name_len + 1; 5029 if (cfg->hisname_length < len) 5030 return (ENAMETOOLONG); 5031 error = copyout(sp->hisauth.name, cfg->hisname, len); 5032 if (error) return error; 5033 } 5034 } 5035 } 5036 break; 5037 case SPPPSETAUTHCFG: 5038 { 5039 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5040 int error; 5041 5042 if (sp->myauth.name) { 5043 free(sp->myauth.name, M_DEVBUF); 5044 sp->myauth.name = NULL; 5045 } 5046 if (sp->myauth.secret) { 5047 free(sp->myauth.secret, M_DEVBUF); 5048 sp->myauth.secret = NULL; 5049 } 5050 if (sp->hisauth.name) { 5051 free(sp->hisauth.name, M_DEVBUF); 5052 sp->hisauth.name = NULL; 5053 } 5054 if (sp->hisauth.secret) { 5055 free(sp->hisauth.secret, M_DEVBUF); 5056 sp->hisauth.secret = NULL; 5057 } 5058 5059 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5060 if (cfg->hisname_length >= MCLBYTES) 5061 return (ENAMETOOLONG); 5062 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5063 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5064 if (error) { 5065 free(sp->hisauth.name, M_DEVBUF); 5066 sp->hisauth.name = NULL; 5067 return error; 5068 } 5069 sp->hisauth.name_len = cfg->hisname_length - 1; 5070 sp->hisauth.name[sp->hisauth.name_len] = 0; 5071 } 5072 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5073 if (cfg->hissecret_length >= MCLBYTES) 5074 return (ENAMETOOLONG); 5075 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5076 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5077 if (error) { 5078 free(sp->hisauth.secret, M_DEVBUF); 5079 sp->hisauth.secret = NULL; 5080 return error; 5081 } 5082 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5083 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5084 } 5085 if (cfg->myname != NULL && cfg->myname_length > 0) { 5086 if (cfg->myname_length >= MCLBYTES) 5087 return (ENAMETOOLONG); 5088 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5089 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5090 if (error) { 5091 free(sp->myauth.name, M_DEVBUF); 5092 sp->myauth.name = NULL; 5093 return error; 5094 } 5095 sp->myauth.name_len = cfg->myname_length - 1; 5096 sp->myauth.name[sp->myauth.name_len] = 0; 5097 } 5098 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5099 if (cfg->mysecret_length >= MCLBYTES) 5100 return (ENAMETOOLONG); 5101 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5102 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5103 if (error) { 5104 free(sp->myauth.secret, M_DEVBUF); 5105 sp->myauth.secret = NULL; 5106 return error; 5107 } 5108 sp->myauth.secret_len = cfg->mysecret_length - 1; 5109 sp->myauth.secret[sp->myauth.secret_len] = 0; 5110 } 5111 sp->myauth.flags = cfg->myauthflags; 5112 if (cfg->myauth) 5113 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5114 sp->hisauth.flags = cfg->hisauthflags; 5115 if (cfg->hisauth) 5116 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5117 sp->pp_auth_failures = 0; 5118 if (sp->hisauth.proto != 0) 5119 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5120 else 5121 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5122 } 5123 break; 5124 case SPPPGETLCPCFG: 5125 { 5126 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5127 lcp->lcp_timeout = sp->lcp.timeout; 5128 } 5129 break; 5130 case SPPPSETLCPCFG: 5131 { 5132 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5133 sp->lcp.timeout = lcp->lcp_timeout; 5134 } 5135 break; 5136 case SPPPGETSTATUS: 5137 { 5138 struct spppstatus *status = (struct spppstatus *)data; 5139 status->phase = sp->pp_phase; 5140 } 5141 break; 5142 case SPPPGETIDLETO: 5143 { 5144 struct spppidletimeout *to = (struct spppidletimeout *)data; 5145 to->idle_seconds = sp->pp_idle_timeout; 5146 } 5147 break; 5148 case SPPPSETIDLETO: 5149 { 5150 struct spppidletimeout *to = (struct spppidletimeout *)data; 5151 sp->pp_idle_timeout = to->idle_seconds; 5152 } 5153 break; 5154 case SPPPSETAUTHFAILURE: 5155 { 5156 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5157 sp->pp_max_auth_fail = afsettings->max_failures; 5158 sp->pp_auth_failures = 0; 5159 } 5160 break; 5161 case SPPPGETAUTHFAILURES: 5162 { 5163 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5164 stats->auth_failures = sp->pp_auth_failures; 5165 stats->max_failures = sp->pp_max_auth_fail; 5166 } 5167 break; 5168 case SPPPSETDNSOPTS: 5169 { 5170 struct spppdnssettings *req = (struct spppdnssettings *)data; 5171 sp->query_dns = req->query_dns & 3; 5172 } 5173 break; 5174 case SPPPGETDNSOPTS: 5175 { 5176 struct spppdnssettings *req = (struct spppdnssettings *)data; 5177 req->query_dns = sp->query_dns; 5178 } 5179 break; 5180 case SPPPGETDNSADDRS: 5181 { 5182 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5183 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5184 } 5185 break; 5186 case SPPPGETKEEPALIVE: 5187 { 5188 struct spppkeepalivesettings *settings = 5189 (struct spppkeepalivesettings*)data; 5190 settings->maxalive = sp->pp_maxalive; 5191 settings->max_noreceive = sp->pp_max_noreceive; 5192 } 5193 break; 5194 case SPPPSETKEEPALIVE: 5195 { 5196 struct spppkeepalivesettings *settings = 5197 (struct spppkeepalivesettings*)data; 5198 sp->pp_maxalive = settings->maxalive; 5199 sp->pp_max_noreceive = settings->max_noreceive; 5200 } 5201 break; 5202 default: 5203 return (EINVAL); 5204 } 5205 5206 return (0); 5207 } 5208 5209 static void 5210 sppp_phase_network(struct sppp *sp) 5211 { 5212 STDDCL; 5213 int i; 5214 u_int32_t mask; 5215 5216 sp->pp_phase = SPPP_PHASE_NETWORK; 5217 5218 if (debug) 5219 { 5220 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5221 sppp_phase_name(sp->pp_phase)); 5222 } 5223 5224 /* Notify NCPs now. */ 5225 for (i = 0; i < IDX_COUNT; i++) 5226 if ((cps[i])->flags & CP_NCP) 5227 (cps[i])->Open(sp); 5228 5229 /* Send Up events to all NCPs. */ 5230 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5231 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5232 (cps[i])->Up(sp); 5233 5234 /* if no NCP is starting, all this was in vain, close down */ 5235 sppp_lcp_check_and_close(sp); 5236 } 5237 5238 5239 static const char * 5240 sppp_cp_type_name(u_char type) 5241 { 5242 static char buf[12]; 5243 switch (type) { 5244 case CONF_REQ: return "conf-req"; 5245 case CONF_ACK: return "conf-ack"; 5246 case CONF_NAK: return "conf-nak"; 5247 case CONF_REJ: return "conf-rej"; 5248 case TERM_REQ: return "term-req"; 5249 case TERM_ACK: return "term-ack"; 5250 case CODE_REJ: return "code-rej"; 5251 case PROTO_REJ: return "proto-rej"; 5252 case ECHO_REQ: return "echo-req"; 5253 case ECHO_REPLY: return "echo-reply"; 5254 case DISC_REQ: return "discard-req"; 5255 } 5256 sprintf (buf, "0x%x", type); 5257 return buf; 5258 } 5259 5260 static const char * 5261 sppp_auth_type_name(u_short proto, u_char type) 5262 { 5263 static char buf[12]; 5264 switch (proto) { 5265 case PPP_CHAP: 5266 switch (type) { 5267 case CHAP_CHALLENGE: return "challenge"; 5268 case CHAP_RESPONSE: return "response"; 5269 case CHAP_SUCCESS: return "success"; 5270 case CHAP_FAILURE: return "failure"; 5271 } 5272 case PPP_PAP: 5273 switch (type) { 5274 case PAP_REQ: return "req"; 5275 case PAP_ACK: return "ack"; 5276 case PAP_NAK: return "nak"; 5277 } 5278 } 5279 sprintf (buf, "0x%x", type); 5280 return buf; 5281 } 5282 5283 static const char * 5284 sppp_lcp_opt_name(u_char opt) 5285 { 5286 static char buf[12]; 5287 switch (opt) { 5288 case LCP_OPT_MRU: return "mru"; 5289 case LCP_OPT_ASYNC_MAP: return "async-map"; 5290 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5291 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5292 case LCP_OPT_MAGIC: return "magic"; 5293 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5294 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5295 } 5296 sprintf (buf, "0x%x", opt); 5297 return buf; 5298 } 5299 5300 static const char * 5301 sppp_ipcp_opt_name(u_char opt) 5302 { 5303 static char buf[12]; 5304 switch (opt) { 5305 case IPCP_OPT_ADDRESSES: return "addresses"; 5306 case IPCP_OPT_COMPRESSION: return "compression"; 5307 case IPCP_OPT_ADDRESS: return "address"; 5308 } 5309 sprintf (buf, "0x%x", opt); 5310 return buf; 5311 } 5312 5313 #ifdef INET6 5314 static const char * 5315 sppp_ipv6cp_opt_name(u_char opt) 5316 { 5317 static char buf[12]; 5318 switch (opt) { 5319 case IPV6CP_OPT_IFID: return "ifid"; 5320 case IPV6CP_OPT_COMPRESSION: return "compression"; 5321 } 5322 sprintf (buf, "0x%x", opt); 5323 return buf; 5324 } 5325 #endif 5326 5327 static const char * 5328 sppp_state_name(int state) 5329 { 5330 switch (state) { 5331 case STATE_INITIAL: return "initial"; 5332 case STATE_STARTING: return "starting"; 5333 case STATE_CLOSED: return "closed"; 5334 case STATE_STOPPED: return "stopped"; 5335 case STATE_CLOSING: return "closing"; 5336 case STATE_STOPPING: return "stopping"; 5337 case STATE_REQ_SENT: return "req-sent"; 5338 case STATE_ACK_RCVD: return "ack-rcvd"; 5339 case STATE_ACK_SENT: return "ack-sent"; 5340 case STATE_OPENED: return "opened"; 5341 } 5342 return "illegal"; 5343 } 5344 5345 static const char * 5346 sppp_phase_name(int phase) 5347 { 5348 switch (phase) { 5349 case SPPP_PHASE_DEAD: return "dead"; 5350 case SPPP_PHASE_ESTABLISH: return "establish"; 5351 case SPPP_PHASE_TERMINATE: return "terminate"; 5352 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5353 case SPPP_PHASE_NETWORK: return "network"; 5354 } 5355 return "illegal"; 5356 } 5357 5358 static const char * 5359 sppp_proto_name(u_short proto) 5360 { 5361 static char buf[12]; 5362 switch (proto) { 5363 case PPP_LCP: return "lcp"; 5364 case PPP_IPCP: return "ipcp"; 5365 case PPP_PAP: return "pap"; 5366 case PPP_CHAP: return "chap"; 5367 case PPP_IPV6CP: return "ipv6cp"; 5368 } 5369 sprintf(buf, "0x%x", (unsigned)proto); 5370 return buf; 5371 } 5372 5373 static void 5374 sppp_print_bytes(const u_char *p, u_short len) 5375 { 5376 addlog(" %02x", *p++); 5377 while (--len > 0) 5378 addlog("-%02x", *p++); 5379 } 5380 5381 static void 5382 sppp_print_string(const char *p, u_short len) 5383 { 5384 u_char c; 5385 5386 while (len-- > 0) { 5387 c = *p++; 5388 /* 5389 * Print only ASCII chars directly. RFC 1994 recommends 5390 * using only them, but we don't rely on it. */ 5391 if (c < ' ' || c > '~') 5392 addlog("\\x%x", c); 5393 else 5394 addlog("%c", c); 5395 } 5396 } 5397 5398 static const char * 5399 sppp_dotted_quad(u_int32_t addr) 5400 { 5401 static char s[16]; 5402 sprintf(s, "%d.%d.%d.%d", 5403 (int)((addr >> 24) & 0xff), 5404 (int)((addr >> 16) & 0xff), 5405 (int)((addr >> 8) & 0xff), 5406 (int)(addr & 0xff)); 5407 return s; 5408 } 5409 5410 /* a dummy, used to drop uninteresting events */ 5411 static void 5412 sppp_null(struct sppp *unused) 5413 { 5414 /* do just nothing */ 5415 } 5416 /* 5417 * This file is large. Tell emacs to highlight it nevertheless. 5418 * 5419 * Local Variables: 5420 * hilit-auto-highlight-maxout: 120000 5421 * End: 5422 */ 5423
Indexes created Fri Sep 26 08:10:20 GMT 2025