if_spppsubr.c revision 25955
1/* 2 * Synchronous PPP/Cisco link level subroutines. 3 * Keepalive protocol implemented in both Cisco and PPP modes. 4 * 5 * Copyright (C) 1994 Cronyx Ltd. 6 * Author: Serge Vakulenko, <vak@cronyx.ru> 7 * 8 * Heavily revamped to conform to RFC 1661. 9 * Copyright (C) 1997, Joerg Wunsch. 10 * 11 * This software is distributed with NO WARRANTIES, not even the implied 12 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 13 * 14 * Authors grant any other persons or organisations permission to use 15 * or modify this software as long as this message is kept with the software, 16 * all derivative works or modified versions. 17 * 18 * From: Version 1.9, Wed Oct 4 18:58:15 MSK 1995 19 * 20 * $Id: if_spppsubr.c,v 1.19 1997/05/19 22:03:09 joerg Exp $ 21 */ 22 23#include <sys/param.h> 24#include <sys/systm.h> 25#include <sys/kernel.h> 26#include <sys/sockio.h> 27#include <sys/socket.h> 28#include <sys/syslog.h> 29#include <sys/mbuf.h> 30 31#include <net/if.h> 32#include <net/netisr.h> 33#include <net/if_types.h> 34 35#ifdef INET 36#include <netinet/in.h> 37#include <netinet/in_systm.h> 38#include <netinet/in_var.h> 39#include <netinet/ip.h> 40#include <netinet/tcp.h> 41#include <netinet/if_ether.h> 42#endif 43 44#ifdef IPX 45#include <netipx/ipx.h> 46#include <netipx/ipx_if.h> 47#endif 48 49#ifdef NS 50#include <netns/ns.h> 51#include <netns/ns_if.h> 52#endif 53 54#ifdef ISO 55#include <netiso/argo_debug.h> 56#include <netiso/iso.h> 57#include <netiso/iso_var.h> 58#include <netiso/iso_snpac.h> 59#endif 60 61#include <net/if_sppp.h> 62 63#define MAXALIVECNT 3 /* max. alive packets */ 64 65/* 66 * Interface flags that can be set in an ifconfig command. 67 * 68 * Setting link0 will make the link passive, i.e. it will be marked 69 * as being administrative openable, but won't be opened to begin 70 * with. Incoming calls will be answered, or subsequent calls with 71 * -link1 will cause the administrative open of the LCP layer. 72 * 73 * Setting link1 will cause the link to auto-dial only as packets 74 * arrive to be sent. 75 */ 76 77#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 78#define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 79 80#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 81#define PPP_UI 0x03 /* Unnumbered Information */ 82#define PPP_IP 0x0021 /* Internet Protocol */ 83#define PPP_ISO 0x0023 /* ISO OSI Protocol */ 84#define PPP_XNS 0x0025 /* Xerox NS Protocol */ 85#define PPP_IPX 0x002b /* Novell IPX Protocol */ 86#define PPP_LCP 0xc021 /* Link Control Protocol */ 87#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 88 89#define CONF_REQ 1 /* PPP configure request */ 90#define CONF_ACK 2 /* PPP configure acknowledge */ 91#define CONF_NAK 3 /* PPP configure negative ack */ 92#define CONF_REJ 4 /* PPP configure reject */ 93#define TERM_REQ 5 /* PPP terminate request */ 94#define TERM_ACK 6 /* PPP terminate acknowledge */ 95#define CODE_REJ 7 /* PPP code reject */ 96#define PROTO_REJ 8 /* PPP protocol reject */ 97#define ECHO_REQ 9 /* PPP echo request */ 98#define ECHO_REPLY 10 /* PPP echo reply */ 99#define DISC_REQ 11 /* PPP discard request */ 100 101#define LCP_OPT_MRU 1 /* maximum receive unit */ 102#define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 103#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 104#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 105#define LCP_OPT_MAGIC 5 /* magic number */ 106#define LCP_OPT_RESERVED 6 /* reserved */ 107#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 108#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 109 110#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 111#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 112#define IPCP_OPT_ADDRESS 3 /* local IP address */ 113 114#define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 115#define CISCO_UNICAST 0x0f /* Cisco unicast address */ 116#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 117#define CISCO_ADDR_REQ 0 /* Cisco address request */ 118#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 119#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 120 121/* states are named and numbered according to RFC 1661 */ 122#define STATE_INITIAL 0 123#define STATE_STARTING 1 124#define STATE_CLOSED 2 125#define STATE_STOPPED 3 126#define STATE_CLOSING 4 127#define STATE_STOPPING 5 128#define STATE_REQ_SENT 6 129#define STATE_ACK_RCVD 7 130#define STATE_ACK_SENT 8 131#define STATE_OPENED 9 132 133struct ppp_header { 134 u_char address; 135 u_char control; 136 u_short protocol; 137}; 138#define PPP_HEADER_LEN sizeof (struct ppp_header) 139 140struct lcp_header { 141 u_char type; 142 u_char ident; 143 u_short len; 144}; 145#define LCP_HEADER_LEN sizeof (struct lcp_header) 146 147struct cisco_packet { 148 u_long type; 149 u_long par1; 150 u_long par2; 151 u_short rel; 152 u_short time0; 153 u_short time1; 154}; 155#define CISCO_PACKET_LEN 18 156 157/* 158 * We follow the spelling and capitalization of RFC 1661 here, to make 159 * it easier comparing with the standard. Please refer to this RFC in 160 * case you can't make sense out of these abbreviation; it will also 161 * explain the semantics related to the various events and actions. 162 */ 163struct cp { 164 u_short proto; /* PPP control protocol number */ 165 u_char protoidx; /* index into state table in struct sppp */ 166 u_char flags; 167#define CP_LCP 0x01 /* this is the LCP */ 168#define CP_AUTH 0x02 /* this is an authentication protocol */ 169#define CP_NCP 0x04 /* this is a NCP */ 170#define CP_QUAL 0x08 /* this is a quality reporting protocol */ 171 const char *name; /* name of this control protocol */ 172 /* event handlers */ 173 void (*Up)(struct sppp *sp); 174 void (*Down)(struct sppp *sp); 175 void (*Open)(struct sppp *sp); 176 void (*Close)(struct sppp *sp); 177 void (*TO)(void *sp); 178 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 179 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 180 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 181 /* actions */ 182 void (*tlu)(struct sppp *sp); 183 void (*tld)(struct sppp *sp); 184 void (*tls)(struct sppp *sp); 185 void (*tlf)(struct sppp *sp); 186 void (*scr)(struct sppp *sp); 187}; 188 189static struct sppp *spppq; 190 191/* 192 * The following disgusting hack gets around the problem that IP TOS 193 * can't be set yet. We want to put "interactive" traffic on a high 194 * priority queue. To decide if traffic is interactive, we check that 195 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 196 */ 197static u_short interactive_ports[8] = { 198 0, 513, 0, 0, 199 0, 21, 0, 23, 200}; 201#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 202 203/* almost every function needs these */ 204#define STDDCL \ 205 struct ifnet *ifp = &sp->pp_if; \ 206 int debug = ifp->if_flags & IFF_DEBUG 207 208static int sppp_output(struct ifnet *ifp, struct mbuf *m, 209 struct sockaddr *dst, struct rtentry *rt); 210 211static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 212static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 213 214static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 215 struct mbuf *m); 216static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 217 u_char ident, u_short len, void *data); 218static void sppp_cp_timeout(void *arg); 219static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 220 int newstate); 221 222static void sppp_up_event(const struct cp *cp, struct sppp *sp); 223static void sppp_down_event(const struct cp *cp, struct sppp *sp); 224static void sppp_open_event(const struct cp *cp, struct sppp *sp); 225static void sppp_close_event(const struct cp *cp, struct sppp *sp); 226static void sppp_to_event(const struct cp *cp, struct sppp *sp); 227 228static void sppp_lcp_init(struct sppp *sp); 229static void sppp_lcp_up(struct sppp *sp); 230static void sppp_lcp_down(struct sppp *sp); 231static void sppp_lcp_open(struct sppp *sp); 232static void sppp_lcp_close(struct sppp *sp); 233static void sppp_lcp_TO(void *sp); 234static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 235static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 236static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 237static void sppp_lcp_tlu(struct sppp *sp); 238static void sppp_lcp_tld(struct sppp *sp); 239static void sppp_lcp_tls(struct sppp *sp); 240static void sppp_lcp_tlf(struct sppp *sp); 241static void sppp_lcp_scr(struct sppp *sp); 242static void sppp_lcp_check(struct sppp *sp); 243 244static void sppp_ipcp_init(struct sppp *sp); 245static void sppp_ipcp_up(struct sppp *sp); 246static void sppp_ipcp_down(struct sppp *sp); 247static void sppp_ipcp_open(struct sppp *sp); 248static void sppp_ipcp_close(struct sppp *sp); 249static void sppp_ipcp_TO(void *sp); 250static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 251static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 252static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 253static void sppp_ipcp_tlu(struct sppp *sp); 254static void sppp_ipcp_tld(struct sppp *sp); 255static void sppp_ipcp_tls(struct sppp *sp); 256static void sppp_ipcp_tlf(struct sppp *sp); 257static void sppp_ipcp_scr(struct sppp *sp); 258 259static const char *sppp_cp_type_name(u_char type); 260static const char *sppp_lcp_opt_name(u_char opt); 261static const char *sppp_ipcp_opt_name(u_char opt); 262static const char *sppp_state_name(int state); 263static const char *sppp_phase_name(enum ppp_phase phase); 264static const char *sppp_proto_name(u_short proto); 265 266static void sppp_keepalive(void *dummy); 267static void sppp_qflush(struct ifqueue *ifq); 268 269static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst); 270static void sppp_set_ip_addr(struct sppp *sp, u_long src); 271 272static void sppp_print_bytes(u_char *p, u_short len); 273 274/* our control protocol descriptors */ 275const struct cp lcp = { 276 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 277 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 278 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 279 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 280 sppp_lcp_scr 281}; 282 283const struct cp ipcp = { 284 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 285 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 286 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 287 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 288 sppp_ipcp_scr 289}; 290 291const struct cp *cps[IDX_COUNT] = { 292 &lcp, /* IDX_LCP */ 293 &ipcp, /* IDX_IPCP */ 294}; 295 296 297/* 298 * Exported functions, comprising our interface to the lower layer. 299 */ 300 301/* 302 * Process the received packet. 303 */ 304void 305sppp_input(struct ifnet *ifp, struct mbuf *m) 306{ 307 struct ppp_header *h; 308 struct ifqueue *inq = 0; 309 int s; 310 struct sppp *sp = (struct sppp *)ifp; 311 int debug = ifp->if_flags & IFF_DEBUG; 312 313 if (ifp->if_flags & IFF_UP) 314 /* Count received bytes, add FCS and one flag */ 315 ifp->if_ibytes += m->m_pkthdr.len + 3; 316 317 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 318 /* Too small packet, drop it. */ 319 if (debug) 320 log(LOG_DEBUG, 321 "%s%d: input packet is too small, %d bytes\n", 322 ifp->if_name, ifp->if_unit, m->m_pkthdr.len); 323 drop: 324 ++ifp->if_ierrors; 325 ++ifp->if_iqdrops; 326 m_freem (m); 327 return; 328 } 329 330 /* Get PPP header. */ 331 h = mtod (m, struct ppp_header*); 332 m_adj (m, PPP_HEADER_LEN); 333 334 switch (h->address) { 335 case PPP_ALLSTATIONS: 336 if (h->control != PPP_UI) 337 goto invalid; 338 if (sp->pp_flags & PP_CISCO) { 339 if (debug) 340 log(LOG_DEBUG, 341 "%s%d: PPP packet in Cisco mode " 342 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 343 ifp->if_name, ifp->if_unit, 344 h->address, h->control, ntohs(h->protocol)); 345 goto drop; 346 } 347 switch (ntohs (h->protocol)) { 348 default: 349 if (sp->state[IDX_LCP] == STATE_OPENED) 350 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 351 ++sp->pp_seq, m->m_pkthdr.len + 2, 352 &h->protocol); 353 if (debug) 354 log(LOG_DEBUG, 355 "%s%d: invalid input protocol " 356 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 357 ifp->if_name, ifp->if_unit, 358 h->address, h->control, ntohs(h->protocol)); 359 ++ifp->if_noproto; 360 goto drop; 361 case PPP_LCP: 362 sppp_cp_input(&lcp, (struct sppp*)ifp, m); 363 m_freem (m); 364 return; 365#ifdef INET 366 case PPP_IPCP: 367 if (sp->pp_phase == PHASE_NETWORK) 368 sppp_cp_input(&ipcp, (struct sppp*) ifp, m); 369 m_freem (m); 370 return; 371 case PPP_IP: 372 if (sp->state[IDX_IPCP] == STATE_OPENED) { 373 schednetisr (NETISR_IP); 374 inq = &ipintrq; 375 } 376 break; 377#endif 378#ifdef IPX 379 case PPP_IPX: 380 /* IPX IPXCP not implemented yet */ 381 if (sp->pp_phase == PHASE_NETWORK) { 382 schednetisr (NETISR_IPX); 383 inq = &ipxintrq; 384 } 385 break; 386#endif 387#ifdef NS 388 case PPP_XNS: 389 /* XNS IDPCP not implemented yet */ 390 if (sp->pp_phase == PHASE_NETWORK) { 391 schednetisr (NETISR_NS); 392 inq = &nsintrq; 393 } 394 break; 395#endif 396#ifdef ISO 397 case PPP_ISO: 398 /* OSI NLCP not implemented yet */ 399 if (sp->pp_phase == PHASE_NETWORK) { 400 schednetisr (NETISR_ISO); 401 inq = &clnlintrq; 402 } 403 break; 404#endif 405 } 406 break; 407 case CISCO_MULTICAST: 408 case CISCO_UNICAST: 409 /* Don't check the control field here (RFC 1547). */ 410 if (! (sp->pp_flags & PP_CISCO)) { 411 if (debug) 412 log(LOG_DEBUG, 413 "%s%d: Cisco packet in PPP mode " 414 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 415 ifp->if_name, ifp->if_unit, 416 h->address, h->control, ntohs(h->protocol)); 417 goto drop; 418 } 419 switch (ntohs (h->protocol)) { 420 default: 421 ++ifp->if_noproto; 422 goto invalid; 423 case CISCO_KEEPALIVE: 424 sppp_cisco_input ((struct sppp*) ifp, m); 425 m_freem (m); 426 return; 427#ifdef INET 428 case ETHERTYPE_IP: 429 schednetisr (NETISR_IP); 430 inq = &ipintrq; 431 break; 432#endif 433#ifdef IPX 434 case ETHERTYPE_IPX: 435 schednetisr (NETISR_IPX); 436 inq = &ipxintrq; 437 break; 438#endif 439#ifdef NS 440 case ETHERTYPE_NS: 441 schednetisr (NETISR_NS); 442 inq = &nsintrq; 443 break; 444#endif 445 } 446 break; 447 default: /* Invalid PPP packet. */ 448 invalid: 449 if (debug) 450 log(LOG_DEBUG, 451 "%s%d: invalid input packet " 452 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 453 ifp->if_name, ifp->if_unit, 454 h->address, h->control, ntohs(h->protocol)); 455 goto drop; 456 } 457 458 if (! (ifp->if_flags & IFF_UP) || ! inq) 459 goto drop; 460 461 /* Check queue. */ 462 s = splimp(); 463 if (IF_QFULL (inq)) { 464 /* Queue overflow. */ 465 IF_DROP(inq); 466 splx(s); 467 if (debug) 468 log(LOG_DEBUG, "%s%d: protocol queue overflow\n", 469 ifp->if_name, ifp->if_unit); 470 goto drop; 471 } 472 IF_ENQUEUE(inq, m); 473 splx(s); 474} 475 476/* 477 * Enqueue transmit packet. 478 */ 479static int 480sppp_output(struct ifnet *ifp, struct mbuf *m, 481 struct sockaddr *dst, struct rtentry *rt) 482{ 483 struct sppp *sp = (struct sppp*) ifp; 484 struct ppp_header *h; 485 struct ifqueue *ifq; 486 int s, rv = 0; 487 488 s = splimp(); 489 490 if ((ifp->if_flags & IFF_UP) == 0 || 491 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 492 m_freem (m); 493 splx (s); 494 return (ENETDOWN); 495 } 496 497 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 498 /* 499 * Interface is not yet running, but auto-dial. Need 500 * to start LCP for it. 501 */ 502 ifp->if_flags |= IFF_RUNNING; 503 splx(s); 504 lcp.Open(sp); 505 s = splimp(); 506 } 507 508 ifq = &ifp->if_snd; 509#ifdef INET 510 /* 511 * Put low delay, telnet, rlogin and ftp control packets 512 * in front of the queue. 513 */ 514 if (dst->sa_family == AF_INET) { 515 struct ip *ip = mtod (m, struct ip*); 516 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 517 518 if (! IF_QFULL (&sp->pp_fastq) && 519 ((ip->ip_tos & IPTOS_LOWDELAY) || 520 ip->ip_p == IPPROTO_TCP && 521 m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) && 522 (INTERACTIVE (ntohs (tcp->th_sport)) || 523 INTERACTIVE (ntohs (tcp->th_dport))))) 524 ifq = &sp->pp_fastq; 525 } 526#endif 527 528 /* 529 * Prepend general data packet PPP header. For now, IP only. 530 */ 531 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 532 if (! m) { 533 if (ifp->if_flags & IFF_DEBUG) 534 log(LOG_DEBUG, "%s%d: no memory for transmit header\n", 535 ifp->if_name, ifp->if_unit); 536 ++ifp->if_oerrors; 537 splx (s); 538 return (ENOBUFS); 539 } 540 h = mtod (m, struct ppp_header*); 541 if (sp->pp_flags & PP_CISCO) { 542 h->address = CISCO_MULTICAST; /* broadcast address */ 543 h->control = 0; 544 } else { 545 h->address = PPP_ALLSTATIONS; /* broadcast address */ 546 h->control = PPP_UI; /* Unnumbered Info */ 547 } 548 549 switch (dst->sa_family) { 550#ifdef INET 551 case AF_INET: /* Internet Protocol */ 552 if (sp->pp_flags & PP_CISCO) 553 h->protocol = htons (ETHERTYPE_IP); 554 else { 555 /* 556 * Don't choke with an ENETDOWN early. It's 557 * possible that we just started dialing out, 558 * so don't drop the packet immediately. If 559 * we notice that we run out of buffer space 560 * below, we will however remember that we are 561 * not ready to carry IP packets, and return 562 * ENETDOWN, as opposed to ENOBUFS. 563 */ 564 h->protocol = htons(PPP_IP); 565 if (sp->state[IDX_IPCP] != STATE_OPENED) 566 rv = ENETDOWN; 567 } 568 break; 569#endif 570#ifdef NS 571 case AF_NS: /* Xerox NS Protocol */ 572 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 573 ETHERTYPE_NS : PPP_XNS); 574 break; 575#endif 576#ifdef IPX 577 case AF_IPX: /* Novell IPX Protocol */ 578 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 579 ETHERTYPE_IPX : PPP_IPX); 580 break; 581#endif 582#ifdef ISO 583 case AF_ISO: /* ISO OSI Protocol */ 584 if (sp->pp_flags & PP_CISCO) 585 goto nosupport; 586 h->protocol = htons (PPP_ISO); 587 break; 588nosupport: 589#endif 590 default: 591 m_freem (m); 592 ++ifp->if_oerrors; 593 splx (s); 594 return (EAFNOSUPPORT); 595 } 596 597 /* 598 * Queue message on interface, and start output if interface 599 * not yet active. 600 */ 601 if (IF_QFULL (ifq)) { 602 IF_DROP (&ifp->if_snd); 603 m_freem (m); 604 ++ifp->if_oerrors; 605 splx (s); 606 return (rv? rv: ENOBUFS); 607 } 608 IF_ENQUEUE (ifq, m); 609 if (! (ifp->if_flags & IFF_OACTIVE)) 610 (*ifp->if_start) (ifp); 611 612 /* 613 * Count output packets and bytes. 614 * The packet length includes header, FCS and 1 flag, 615 * according to RFC 1333. 616 */ 617 ifp->if_obytes += m->m_pkthdr.len + 3; 618 splx (s); 619 return (0); 620} 621 622void 623sppp_attach(struct ifnet *ifp) 624{ 625 struct sppp *sp = (struct sppp*) ifp; 626 627 /* Initialize keepalive handler. */ 628 if (! spppq) 629 timeout (sppp_keepalive, 0, hz * 10); 630 631 /* Insert new entry into the keepalive list. */ 632 sp->pp_next = spppq; 633 spppq = sp; 634 635 sp->pp_if.if_type = IFT_PPP; 636 sp->pp_if.if_output = sppp_output; 637 sp->pp_fastq.ifq_maxlen = 32; 638 sp->pp_loopcnt = 0; 639 sp->pp_alivecnt = 0; 640 sp->pp_seq = 0; 641 sp->pp_rseq = 0; 642 sp->pp_phase = PHASE_DEAD; 643 sp->pp_up = lcp.Up; 644 sp->pp_down = lcp.Down; 645 646 sppp_lcp_init(sp); 647 sppp_ipcp_init(sp); 648} 649 650void 651sppp_detach(struct ifnet *ifp) 652{ 653 struct sppp **q, *p, *sp = (struct sppp*) ifp; 654 int i; 655 656 /* Remove the entry from the keepalive list. */ 657 for (q = &spppq; (p = *q); q = &p->pp_next) 658 if (p == sp) { 659 *q = p->pp_next; 660 break; 661 } 662 663 /* Stop keepalive handler. */ 664 if (! spppq) 665 untimeout (sppp_keepalive, 0); 666 667 for (i = 0; i < IDX_COUNT; i++) 668 untimeout((cps[i])->TO, (void *)sp); 669} 670 671/* 672 * Flush the interface output queue. 673 */ 674void 675sppp_flush(struct ifnet *ifp) 676{ 677 struct sppp *sp = (struct sppp*) ifp; 678 679 sppp_qflush (&sp->pp_if.if_snd); 680 sppp_qflush (&sp->pp_fastq); 681} 682 683/* 684 * Check if the output queue is empty. 685 */ 686int 687sppp_isempty(struct ifnet *ifp) 688{ 689 struct sppp *sp = (struct sppp*) ifp; 690 int empty, s; 691 692 s = splimp(); 693 empty = !sp->pp_fastq.ifq_head && !sp->pp_if.if_snd.ifq_head; 694 splx(s); 695 return (empty); 696} 697 698/* 699 * Get next packet to send. 700 */ 701struct mbuf * 702sppp_dequeue(struct ifnet *ifp) 703{ 704 struct sppp *sp = (struct sppp*) ifp; 705 struct mbuf *m; 706 int s; 707 708 s = splimp(); 709 IF_DEQUEUE (&sp->pp_fastq, m); 710 if (! m) 711 IF_DEQUEUE (&sp->pp_if.if_snd, m); 712 splx (s); 713 return (m); 714} 715 716/* 717 * Process an ioctl request. Called on low priority level. 718 */ 719int 720sppp_ioctl(struct ifnet *ifp, int cmd, void *data) 721{ 722 struct ifreq *ifr = (struct ifreq*) data; 723 struct sppp *sp = (struct sppp*) ifp; 724 int s, going_up, going_down, newmode; 725 726 s = splimp(); 727 switch (cmd) { 728 case SIOCAIFADDR: 729 case SIOCSIFDSTADDR: 730 break; 731 732 case SIOCSIFADDR: 733 if_up(ifp); 734 /* fall through... */ 735 736 case SIOCSIFFLAGS: 737 going_up = ifp->if_flags & IFF_UP && 738 (ifp->if_flags & IFF_RUNNING) == 0; 739 going_down = (ifp->if_flags & IFF_UP) == 0 && 740 ifp->if_flags & IFF_RUNNING; 741 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 742 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 743 /* sanity */ 744 newmode = IFF_PASSIVE; 745 ifp->if_flags &= ~IFF_AUTO; 746 } 747 748 if (going_up || going_down) 749 lcp.Close(sp); 750 if (going_up && newmode == 0) { 751 /* neither auto-dial nor passive */ 752 ifp->if_flags |= IFF_RUNNING; 753 if (!(sp->pp_flags & PP_CISCO)) 754 lcp.Open(sp); 755 } else if (going_down) 756 ifp->if_flags &= ~IFF_RUNNING; 757 758 break; 759 760#ifdef SIOCSIFMTU 761#ifndef ifr_mtu 762#define ifr_mtu ifr_metric 763#endif 764 case SIOCSIFMTU: 765 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 766 return (EINVAL); 767 ifp->if_mtu = ifr->ifr_mtu; 768 break; 769#endif 770#ifdef SLIOCSETMTU 771 case SLIOCSETMTU: 772 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 773 return (EINVAL); 774 ifp->if_mtu = *(short*)data; 775 break; 776#endif 777#ifdef SIOCGIFMTU 778 case SIOCGIFMTU: 779 ifr->ifr_mtu = ifp->if_mtu; 780 break; 781#endif 782#ifdef SLIOCGETMTU 783 case SLIOCGETMTU: 784 *(short*)data = ifp->if_mtu; 785 break; 786#endif 787 case SIOCADDMULTI: 788 case SIOCDELMULTI: 789 break; 790 791 default: 792 splx(s); 793 return (ENOTTY); 794 } 795 splx(s); 796 return (0); 797} 798 799 800/* 801 * Cisco framing implementation. 802 */ 803 804/* 805 * Handle incoming Cisco keepalive protocol packets. 806 */ 807static void 808sppp_cisco_input(struct sppp *sp, struct mbuf *m) 809{ 810 STDDCL; 811 struct cisco_packet *h; 812 struct ifaddr *ifa; 813 814 if (m->m_pkthdr.len != CISCO_PACKET_LEN) { 815 if (debug) 816 log(LOG_DEBUG, 817 "%s%d: invalid cisco packet length: %d bytes\n", 818 ifp->if_name, ifp->if_unit, m->m_pkthdr.len); 819 return; 820 } 821 h = mtod (m, struct cisco_packet*); 822 if (debug) 823 log(LOG_DEBUG, 824 "%s%d: cisco input: %d bytes " 825 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 826 ifp->if_name, ifp->if_unit, m->m_pkthdr.len, 827 ntohl (h->type), h->par1, h->par2, h->rel, 828 h->time0, h->time1); 829 switch (ntohl (h->type)) { 830 default: 831 if (debug) 832 addlog("%s%d: unknown cisco packet type: 0x%lx\n", 833 ifp->if_name, ifp->if_unit, ntohl (h->type)); 834 break; 835 case CISCO_ADDR_REPLY: 836 /* Reply on address request, ignore */ 837 break; 838 case CISCO_KEEPALIVE_REQ: 839 sp->pp_alivecnt = 0; 840 sp->pp_rseq = ntohl (h->par1); 841 if (sp->pp_seq == sp->pp_rseq) { 842 /* Local and remote sequence numbers are equal. 843 * Probably, the line is in loopback mode. */ 844 if (sp->pp_loopcnt >= MAXALIVECNT) { 845 printf ("%s%d: loopback\n", 846 ifp->if_name, ifp->if_unit); 847 sp->pp_loopcnt = 0; 848 if (ifp->if_flags & IFF_UP) { 849 if_down (ifp); 850 sppp_qflush (&sp->pp_fastq); 851 } 852 } 853 ++sp->pp_loopcnt; 854 855 /* Generate new local sequence number */ 856 sp->pp_seq ^= time.tv_sec ^ time.tv_usec; 857 break; 858 } 859 sp->pp_loopcnt = 0; 860 if (! (ifp->if_flags & IFF_UP) && 861 (ifp->if_flags & IFF_RUNNING)) { 862 ifp->if_flags |= IFF_UP; 863 printf ("%s%d: up\n", ifp->if_name, ifp->if_unit); 864 } 865 break; 866 case CISCO_ADDR_REQ: 867 for (ifa=ifp->if_addrhead.tqh_first; ifa; 868 ifa=ifa->ifa_link.tqe_next) 869 if (ifa->ifa_addr->sa_family == AF_INET) 870 break; 871 if (! ifa) { 872 if (debug) 873 addlog("%s%d: unknown address for cisco request\n", 874 ifp->if_name, ifp->if_unit); 875 return; 876 } 877 sppp_cisco_send (sp, CISCO_ADDR_REPLY, 878 ntohl (((struct sockaddr_in*)ifa->ifa_addr)->sin_addr.s_addr), 879 ntohl (((struct sockaddr_in*)ifa->ifa_netmask)->sin_addr.s_addr)); 880 break; 881 } 882} 883 884/* 885 * Send Cisco keepalive packet. 886 */ 887static void 888sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 889{ 890 STDDCL; 891 struct ppp_header *h; 892 struct cisco_packet *ch; 893 struct mbuf *m; 894 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 895 896 MGETHDR (m, M_DONTWAIT, MT_DATA); 897 if (! m) 898 return; 899 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 900 m->m_pkthdr.rcvif = 0; 901 902 h = mtod (m, struct ppp_header*); 903 h->address = CISCO_MULTICAST; 904 h->control = 0; 905 h->protocol = htons (CISCO_KEEPALIVE); 906 907 ch = (struct cisco_packet*) (h + 1); 908 ch->type = htonl (type); 909 ch->par1 = htonl (par1); 910 ch->par2 = htonl (par2); 911 ch->rel = -1; 912 ch->time0 = htons ((u_short) (t >> 16)); 913 ch->time1 = htons ((u_short) t); 914 915 if (debug) 916 log(LOG_DEBUG, 917 "%s%d: cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 918 ifp->if_name, ifp->if_unit, ntohl (ch->type), ch->par1, 919 ch->par2, ch->rel, ch->time0, ch->time1); 920 921 if (IF_QFULL (&sp->pp_fastq)) { 922 IF_DROP (&ifp->if_snd); 923 m_freem (m); 924 } else 925 IF_ENQUEUE (&sp->pp_fastq, m); 926 if (! (ifp->if_flags & IFF_OACTIVE)) 927 (*ifp->if_start) (ifp); 928 ifp->if_obytes += m->m_pkthdr.len + 3; 929} 930 931/* 932 * PPP protocol implementation. 933 */ 934 935/* 936 * Send PPP control protocol packet. 937 */ 938static void 939sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 940 u_char ident, u_short len, void *data) 941{ 942 STDDCL; 943 struct ppp_header *h; 944 struct lcp_header *lh; 945 struct mbuf *m; 946 947 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 948 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 949 MGETHDR (m, M_DONTWAIT, MT_DATA); 950 if (! m) 951 return; 952 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 953 m->m_pkthdr.rcvif = 0; 954 955 h = mtod (m, struct ppp_header*); 956 h->address = PPP_ALLSTATIONS; /* broadcast address */ 957 h->control = PPP_UI; /* Unnumbered Info */ 958 h->protocol = htons (proto); /* Link Control Protocol */ 959 960 lh = (struct lcp_header*) (h + 1); 961 lh->type = type; 962 lh->ident = ident; 963 lh->len = htons (LCP_HEADER_LEN + len); 964 if (len) 965 bcopy (data, lh+1, len); 966 967 if (debug) { 968 log(LOG_DEBUG, "%s%d: %s output <%s id=0x%x len=%d", 969 ifp->if_name, ifp->if_unit, 970 sppp_proto_name(proto), 971 sppp_cp_type_name (lh->type), lh->ident, 972 ntohs (lh->len)); 973 if (len) 974 sppp_print_bytes ((u_char*) (lh+1), len); 975 addlog(">\n"); 976 } 977 if (IF_QFULL (&sp->pp_fastq)) { 978 IF_DROP (&ifp->if_snd); 979 m_freem (m); 980 ++ifp->if_oerrors; 981 } else 982 IF_ENQUEUE (&sp->pp_fastq, m); 983 if (! (ifp->if_flags & IFF_OACTIVE)) 984 (*ifp->if_start) (ifp); 985 ifp->if_obytes += m->m_pkthdr.len + 3; 986} 987 988/* 989 * Handle incoming PPP control protocol packets. 990 */ 991static void 992sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 993{ 994 STDDCL; 995 struct lcp_header *h; 996 int len = m->m_pkthdr.len; 997 int rv; 998 u_char *p; 999 1000 if (len < 4) { 1001 if (debug) 1002 log(LOG_DEBUG, 1003 "%s%d: %s invalid packet length: %d bytes\n", 1004 ifp->if_name, ifp->if_unit, cp->name, len); 1005 return; 1006 } 1007 h = mtod (m, struct lcp_header*); 1008 if (debug) { 1009 log(LOG_DEBUG, 1010 "%s%d: %s input(%s): <%s id=0x%x len=%d", 1011 ifp->if_name, ifp->if_unit, cp->name, 1012 sppp_state_name(sp->state[cp->protoidx]), 1013 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1014 if (len > 4) 1015 sppp_print_bytes ((u_char*) (h+1), len-4); 1016 addlog(">\n"); 1017 } 1018 if (len > ntohs (h->len)) 1019 len = ntohs (h->len); 1020 switch (h->type) { 1021 case CONF_REQ: 1022 if (len < 4) { 1023 if (debug) 1024 addlog("%s%d: %s invalid conf-req length %d\n", 1025 ifp->if_name, ifp->if_unit, cp->name, 1026 len); 1027 ++ifp->if_ierrors; 1028 break; 1029 } 1030 rv = (cp->RCR)(sp, h, len); 1031 switch (sp->state[cp->protoidx]) { 1032 case STATE_OPENED: 1033 (cp->tld)(sp); 1034 (cp->scr)(sp); 1035 /* fall through... */ 1036 case STATE_ACK_SENT: 1037 case STATE_REQ_SENT: 1038 sppp_cp_change_state(cp, sp, rv? 1039 STATE_ACK_SENT: STATE_REQ_SENT); 1040 break; 1041 case STATE_CLOSING: 1042 case STATE_STOPPING: 1043 break; 1044 case STATE_STOPPED: 1045 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1046 (cp->scr)(sp); 1047 sppp_cp_change_state(cp, sp, rv? 1048 STATE_ACK_SENT: STATE_REQ_SENT); 1049 break; 1050 case STATE_CLOSED: 1051 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1052 0, 0); 1053 break; 1054 case STATE_ACK_RCVD: 1055 if (rv) { 1056 sppp_cp_change_state(cp, sp, STATE_OPENED); 1057 if (debug) 1058 addlog("%s%d: %s tlu\n", 1059 ifp->if_name, ifp->if_unit, 1060 cp->name); 1061 (cp->tlu)(sp); 1062 } else 1063 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1064 break; 1065 default: 1066 printf("%s%d: %s illegal %s in state %s\n", 1067 ifp->if_name, ifp->if_unit, cp->name, 1068 sppp_cp_type_name(h->type), 1069 sppp_state_name(sp->state[cp->protoidx])); 1070 ++ifp->if_ierrors; 1071 } 1072 break; 1073 case CONF_ACK: 1074 if (h->ident != sp->confid[cp->protoidx]) { 1075 if (debug) 1076 addlog("%s%d: %s id mismatch 0x%x != 0x%x\n", 1077 ifp->if_name, ifp->if_unit, cp->name, 1078 h->ident, sp->confid[cp->protoidx]); 1079 ++ifp->if_ierrors; 1080 break; 1081 } 1082 switch (sp->state[cp->protoidx]) { 1083 case STATE_CLOSED: 1084 case STATE_STOPPED: 1085 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1086 break; 1087 case STATE_CLOSING: 1088 case STATE_STOPPING: 1089 break; 1090 case STATE_REQ_SENT: 1091 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1092 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1093 break; 1094 case STATE_OPENED: 1095 (cp->tld)(sp); 1096 /* fall through */ 1097 case STATE_ACK_RCVD: 1098 (cp->scr)(sp); 1099 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1100 break; 1101 case STATE_ACK_SENT: 1102 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1103 sppp_cp_change_state(cp, sp, STATE_OPENED); 1104 if (debug) 1105 addlog("%s%d: %s tlu\n", 1106 ifp->if_name, ifp->if_unit, cp->name); 1107 (cp->tlu)(sp); 1108 break; 1109 default: 1110 printf("%s%d: %s illegal %s in state %s\n", 1111 ifp->if_name, ifp->if_unit, cp->name, 1112 sppp_cp_type_name(h->type), 1113 sppp_state_name(sp->state[cp->protoidx])); 1114 ++ifp->if_ierrors; 1115 } 1116 break; 1117 case CONF_NAK: 1118 case CONF_REJ: 1119 if (h->ident != sp->confid[cp->protoidx]) { 1120 if (debug) 1121 addlog("%s%d: %s id mismatch 0x%x != 0x%x\n", 1122 ifp->if_name, ifp->if_unit, cp->name, 1123 h->ident, sp->confid[cp->protoidx]); 1124 ++ifp->if_ierrors; 1125 break; 1126 } 1127 if (h->type == CONF_NAK) 1128 (cp->RCN_nak)(sp, h, len); 1129 else /* CONF_REJ */ 1130 (cp->RCN_rej)(sp, h, len); 1131 1132 switch (sp->state[cp->protoidx]) { 1133 case STATE_CLOSED: 1134 case STATE_STOPPED: 1135 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1136 break; 1137 case STATE_REQ_SENT: 1138 case STATE_ACK_SENT: 1139 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1140 (cp->scr)(sp); 1141 break; 1142 case STATE_OPENED: 1143 (cp->tld)(sp); 1144 /* fall through */ 1145 case STATE_ACK_RCVD: 1146 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1147 (cp->scr)(sp); 1148 break; 1149 case STATE_CLOSING: 1150 case STATE_STOPPING: 1151 break; 1152 default: 1153 printf("%s%d: %s illegal %s in state %s\n", 1154 ifp->if_name, ifp->if_unit, cp->name, 1155 sppp_cp_type_name(h->type), 1156 sppp_state_name(sp->state[cp->protoidx])); 1157 ++ifp->if_ierrors; 1158 } 1159 break; 1160 1161 case TERM_REQ: 1162 switch (sp->state[cp->protoidx]) { 1163 case STATE_ACK_RCVD: 1164 case STATE_ACK_SENT: 1165 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1166 /* fall through */ 1167 case STATE_CLOSED: 1168 case STATE_STOPPED: 1169 case STATE_CLOSING: 1170 case STATE_STOPPING: 1171 case STATE_REQ_SENT: 1172 sta: 1173 /* Send Terminate-Ack packet. */ 1174 if (debug) 1175 log(LOG_DEBUG, "%s%d: %s send terminate-ack\n", 1176 ifp->if_name, ifp->if_unit, cp->name); 1177 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1178 break; 1179 case STATE_OPENED: 1180 (cp->tld)(sp); 1181 sp->rst_counter[cp->protoidx] = 0; 1182 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1183 goto sta; 1184 break; 1185 default: 1186 printf("%s%d: %s illegal %s in state %s\n", 1187 ifp->if_name, ifp->if_unit, cp->name, 1188 sppp_cp_type_name(h->type), 1189 sppp_state_name(sp->state[cp->protoidx])); 1190 ++ifp->if_ierrors; 1191 } 1192 break; 1193 case TERM_ACK: 1194 switch (sp->state[cp->protoidx]) { 1195 case STATE_CLOSED: 1196 case STATE_STOPPED: 1197 case STATE_REQ_SENT: 1198 case STATE_ACK_SENT: 1199 break; 1200 case STATE_CLOSING: 1201 (cp->tlf)(sp); 1202 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1203 break; 1204 case STATE_STOPPING: 1205 (cp->tlf)(sp); 1206 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1207 break; 1208 case STATE_ACK_RCVD: 1209 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1210 break; 1211 case STATE_OPENED: 1212 (cp->tld)(sp); 1213 (cp->scr)(sp); 1214 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1215 break; 1216 default: 1217 printf("%s%d: %s illegal %s in state %s\n", 1218 ifp->if_name, ifp->if_unit, cp->name, 1219 sppp_cp_type_name(h->type), 1220 sppp_state_name(sp->state[cp->protoidx])); 1221 ++ifp->if_ierrors; 1222 } 1223 break; 1224 case CODE_REJ: 1225 case PROTO_REJ: 1226 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1227 switch (sp->state[cp->protoidx]) { 1228 case STATE_CLOSED: 1229 case STATE_STOPPED: 1230 case STATE_REQ_SENT: 1231 case STATE_ACK_SENT: 1232 case STATE_CLOSING: 1233 case STATE_STOPPING: 1234 case STATE_OPENED: 1235 break; 1236 case STATE_ACK_RCVD: 1237 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1238 break; 1239 default: 1240 printf("%s%d: %s illegal %s in state %s\n", 1241 ifp->if_name, ifp->if_unit, cp->name, 1242 sppp_cp_type_name(h->type), 1243 sppp_state_name(sp->state[cp->protoidx])); 1244 ++ifp->if_ierrors; 1245 } 1246 break; 1247 case DISC_REQ: 1248 if (cp->proto != PPP_LCP) 1249 goto illegal; 1250 /* Discard the packet. */ 1251 break; 1252 case ECHO_REQ: 1253 if (cp->proto != PPP_LCP) 1254 goto illegal; 1255 if (sp->state[cp->protoidx] != STATE_OPENED) { 1256 if (debug) 1257 addlog("%s%d: lcp echo req but lcp closed\n", 1258 ifp->if_name, ifp->if_unit); 1259 ++ifp->if_ierrors; 1260 break; 1261 } 1262 if (len < 8) { 1263 if (debug) 1264 addlog("%s%d: invalid lcp echo request " 1265 "packet length: %d bytes\n", 1266 ifp->if_name, ifp->if_unit, len); 1267 break; 1268 } 1269 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1270 /* Line loopback mode detected. */ 1271 printf("%s%d: loopback\n", ifp->if_name, ifp->if_unit); 1272 if_down (ifp); 1273 sppp_qflush (&sp->pp_fastq); 1274 1275 /* Shut down the PPP link. */ 1276 /* XXX */ 1277 lcp.Down(sp); 1278 lcp.Up(sp); 1279 break; 1280 } 1281 *(long*)(h+1) = htonl (sp->lcp.magic); 1282 if (debug) 1283 addlog("%s%d: got lcp echo req, sending echo rep\n", 1284 ifp->if_name, ifp->if_unit); 1285 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1286 break; 1287 case ECHO_REPLY: 1288 if (cp->proto != PPP_LCP) 1289 goto illegal; 1290 if (h->ident != sp->lcp.echoid) { 1291 ++ifp->if_ierrors; 1292 break; 1293 } 1294 if (len < 8) { 1295 if (debug) 1296 addlog("%s%d: lcp invalid echo reply " 1297 "packet length: %d bytes\n", 1298 ifp->if_name, ifp->if_unit, len); 1299 break; 1300 } 1301 if (debug) 1302 addlog("%s%d: lcp got echo rep\n", 1303 ifp->if_name, ifp->if_unit); 1304 if (ntohl (*(long*)(h+1)) != sp->lcp.magic) 1305 sp->pp_alivecnt = 0; 1306 break; 1307 default: 1308 /* Unknown packet type -- send Code-Reject packet. */ 1309 illegal: 1310 if (debug) 1311 addlog("%s%d: %c send code-rej for 0x%x\n", 1312 ifp->if_name, ifp->if_unit, cp->name, h->type); 1313 sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq, 1314 m->m_pkthdr.len, h); 1315 ++ifp->if_ierrors; 1316 } 1317} 1318 1319 1320/* 1321 * The generic part of all Up/Down/Open/Close/TO event handlers. 1322 * Basically, the state transition handling in the automaton. 1323 */ 1324static void 1325sppp_up_event(const struct cp *cp, struct sppp *sp) 1326{ 1327 STDDCL; 1328 1329 if (debug) 1330 log(LOG_DEBUG, "%s%d: %s up(%s)\n", 1331 ifp->if_name, ifp->if_unit, cp->name, 1332 sppp_state_name(sp->state[cp->protoidx])); 1333 1334 switch (sp->state[cp->protoidx]) { 1335 case STATE_INITIAL: 1336 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1337 break; 1338 case STATE_STARTING: 1339 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1340 (cp->scr)(sp); 1341 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1342 break; 1343 default: 1344 printf("%s%d: %s illegal up in state %s\n", 1345 ifp->if_name, ifp->if_unit, cp->name, 1346 sppp_state_name(sp->state[cp->protoidx])); 1347 } 1348} 1349 1350static void 1351sppp_down_event(const struct cp *cp, struct sppp *sp) 1352{ 1353 STDDCL; 1354 1355 if (debug) 1356 log(LOG_DEBUG, "%s%d: %s down(%s)\n", 1357 ifp->if_name, ifp->if_unit, cp->name, 1358 sppp_state_name(sp->state[cp->protoidx])); 1359 1360 switch (sp->state[cp->protoidx]) { 1361 case STATE_CLOSED: 1362 case STATE_CLOSING: 1363 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1364 break; 1365 case STATE_STOPPED: 1366 (cp->tls)(sp); 1367 /* fall through */ 1368 case STATE_STOPPING: 1369 case STATE_REQ_SENT: 1370 case STATE_ACK_RCVD: 1371 case STATE_ACK_SENT: 1372 sppp_cp_change_state(cp, sp, STATE_STARTING); 1373 break; 1374 case STATE_OPENED: 1375 (cp->tld)(sp); 1376 sppp_cp_change_state(cp, sp, STATE_STARTING); 1377 break; 1378 default: 1379 printf("%s%d: %s illegal down in state %s\n", 1380 ifp->if_name, ifp->if_unit, cp->name, 1381 sppp_state_name(sp->state[cp->protoidx])); 1382 } 1383} 1384 1385 1386static void 1387sppp_open_event(const struct cp *cp, struct sppp *sp) 1388{ 1389 STDDCL; 1390 1391 if (debug) 1392 log(LOG_DEBUG, "%s%d: %s open(%s)\n", 1393 ifp->if_name, ifp->if_unit, cp->name, 1394 sppp_state_name(sp->state[cp->protoidx])); 1395 1396 switch (sp->state[cp->protoidx]) { 1397 case STATE_INITIAL: 1398 (cp->tls)(sp); 1399 sppp_cp_change_state(cp, sp, STATE_STARTING); 1400 break; 1401 case STATE_STARTING: 1402 break; 1403 case STATE_CLOSED: 1404 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1405 (cp->scr)(sp); 1406 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1407 break; 1408 case STATE_STOPPED: 1409 case STATE_STOPPING: 1410 case STATE_REQ_SENT: 1411 case STATE_ACK_RCVD: 1412 case STATE_ACK_SENT: 1413 case STATE_OPENED: 1414 break; 1415 case STATE_CLOSING: 1416 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1417 break; 1418 } 1419} 1420 1421 1422static void 1423sppp_close_event(const struct cp *cp, struct sppp *sp) 1424{ 1425 STDDCL; 1426 1427 if (debug) 1428 log(LOG_DEBUG, "%s%d: %s close(%s)\n", 1429 ifp->if_name, ifp->if_unit, cp->name, 1430 sppp_state_name(sp->state[cp->protoidx])); 1431 1432 switch (sp->state[cp->protoidx]) { 1433 case STATE_INITIAL: 1434 case STATE_CLOSED: 1435 case STATE_CLOSING: 1436 break; 1437 case STATE_STARTING: 1438 (cp->tlf)(sp); 1439 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1440 break; 1441 case STATE_STOPPED: 1442 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1443 break; 1444 case STATE_STOPPING: 1445 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1446 break; 1447 case STATE_OPENED: 1448 (cp->tld)(sp); 1449 /* fall through */ 1450 case STATE_REQ_SENT: 1451 case STATE_ACK_RCVD: 1452 case STATE_ACK_SENT: 1453 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1454 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0); 1455 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1456 break; 1457 } 1458} 1459 1460static void 1461sppp_to_event(const struct cp *cp, struct sppp *sp) 1462{ 1463 STDDCL; 1464 int s; 1465 1466 s = splimp(); 1467 if (debug) 1468 log(LOG_DEBUG, "%s%d: %s TO(%s) rst_counter = %d\n", 1469 ifp->if_name, ifp->if_unit, cp->name, 1470 sppp_state_name(sp->state[cp->protoidx]), 1471 sp->rst_counter[cp->protoidx]); 1472 1473 if (--sp->rst_counter[cp->protoidx] < 0) 1474 /* TO- event */ 1475 switch (sp->state[cp->protoidx]) { 1476 case STATE_CLOSING: 1477 (cp->tlf)(sp); 1478 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1479 break; 1480 case STATE_STOPPING: 1481 (cp->tlf)(sp); 1482 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1483 break; 1484 case STATE_REQ_SENT: 1485 case STATE_ACK_RCVD: 1486 case STATE_ACK_SENT: 1487 (cp->tlf)(sp); 1488 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1489 break; 1490 } 1491 else 1492 /* TO+ event */ 1493 switch (sp->state[cp->protoidx]) { 1494 case STATE_CLOSING: 1495 case STATE_STOPPING: 1496 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 1497 0, 0); 1498 timeout(cp->TO, (void *)sp, sp->lcp.timeout); 1499 break; 1500 case STATE_REQ_SENT: 1501 case STATE_ACK_RCVD: 1502 (cp->scr)(sp); 1503 /* sppp_cp_change_state() will restart the timer */ 1504 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1505 break; 1506 case STATE_ACK_SENT: 1507 (cp->scr)(sp); 1508 timeout(cp->TO, (void *)sp, sp->lcp.timeout); 1509 break; 1510 } 1511 1512 splx(s); 1513} 1514 1515/* 1516 * Change the state of a control protocol in the state automaton. 1517 * Takes care of starting/stopping the restart timer. 1518 */ 1519void 1520sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1521{ 1522 sp->state[cp->protoidx] = newstate; 1523 1524 untimeout(cp->TO, (void *)sp); 1525 switch (newstate) { 1526 case STATE_INITIAL: 1527 case STATE_STARTING: 1528 case STATE_CLOSED: 1529 case STATE_STOPPED: 1530 case STATE_OPENED: 1531 break; 1532 case STATE_CLOSING: 1533 case STATE_STOPPING: 1534 case STATE_REQ_SENT: 1535 case STATE_ACK_RCVD: 1536 case STATE_ACK_SENT: 1537 timeout(cp->TO, (void *)sp, sp->lcp.timeout); 1538 break; 1539 } 1540} 1541/* 1542 *--------------------------------------------------------------------------* 1543 * * 1544 * The LCP implementation. * 1545 * * 1546 *--------------------------------------------------------------------------* 1547 */ 1548static void 1549sppp_lcp_init(struct sppp *sp) 1550{ 1551 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1552 sp->lcp.magic = 0; 1553 sp->state[IDX_LCP] = STATE_INITIAL; 1554 sp->fail_counter[IDX_LCP] = 0; 1555 sp->lcp.protos = 0; 1556 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1557 1558 /* 1559 * Initialize counters and timeout values. Note that we don't 1560 * use the 3 seconds suggested in RFC 1661 since we are likely 1561 * running on a fast link. XXX We should probably implement 1562 * the exponential backoff option. Note that these values are 1563 * relevant for all control protocols, not just LCP only. 1564 */ 1565 sp->lcp.timeout = 1 * hz; 1566 sp->lcp.max_terminate = 2; 1567 sp->lcp.max_configure = 10; 1568 sp->lcp.max_failure = 10; 1569} 1570 1571static void 1572sppp_lcp_up(struct sppp *sp) 1573{ 1574 STDDCL; 1575 1576 /* 1577 * If this interface is passive or dial-on-demand, it means 1578 * we've got in incoming call. Activate the interface. 1579 */ 1580 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1581 if (debug) 1582 log(LOG_DEBUG, 1583 "%s%d: Up event (incoming call)\n", 1584 ifp->if_name, ifp->if_unit); 1585 ifp->if_flags |= IFF_RUNNING; 1586 lcp.Open(sp); 1587 } 1588 1589 sppp_up_event(&lcp, sp); 1590} 1591 1592static void 1593sppp_lcp_down(struct sppp *sp) 1594{ 1595 STDDCL; 1596 1597 sppp_down_event(&lcp, sp); 1598 1599 /* 1600 * If this is neither a dial-on-demand nor a passive 1601 * interface, simulate an ``ifconfig down'' action, so the 1602 * administrator can force a redial by another ``ifconfig 1603 * up''. XXX For leased line operation, should we immediately 1604 * try to reopen the connection here? 1605 */ 1606 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 1607 log(LOG_INFO, 1608 "%s%d: Down event (carrier loss), taking interface down.\n", 1609 ifp->if_name, ifp->if_unit); 1610 if_down(ifp); 1611 } else { 1612 if (debug) 1613 log(LOG_DEBUG, 1614 "%s%d: Down event (carrier loss)\n", 1615 ifp->if_name, ifp->if_unit); 1616 } 1617 lcp.Close(sp); 1618 ifp->if_flags &= ~IFF_RUNNING; 1619} 1620 1621static void 1622sppp_lcp_open(struct sppp *sp) 1623{ 1624 sppp_open_event(&lcp, sp); 1625} 1626 1627static void 1628sppp_lcp_close(struct sppp *sp) 1629{ 1630 sppp_close_event(&lcp, sp); 1631} 1632 1633static void 1634sppp_lcp_TO(void *cookie) 1635{ 1636 sppp_to_event(&lcp, (struct sppp *)cookie); 1637} 1638 1639/* 1640 * Analyze a configure request. Return true if it was agreeable, and 1641 * caused action sca, false if it has been rejected or nak'ed, and 1642 * caused action scn. (The return value is used to make the state 1643 * transition decision in the state automaton.) 1644 */ 1645static int 1646sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 1647{ 1648 STDDCL; 1649 u_char *buf, *r, *p; 1650 int origlen, rlen; 1651 u_long nmagic; 1652 1653 len -= 4; 1654 origlen = len; 1655 buf = r = malloc (len, M_TEMP, M_NOWAIT); 1656 if (! buf) 1657 return (0); 1658 1659 if (debug) 1660 log(LOG_DEBUG, "%s%d: lcp parse opts: ", 1661 ifp->if_name, ifp->if_unit); 1662 1663 /* pass 1: check for things that need to be rejected */ 1664 p = (void*) (h+1); 1665 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1666 if (debug) 1667 addlog(" %s ", sppp_lcp_opt_name(*p)); 1668 switch (*p) { 1669 case LCP_OPT_MAGIC: 1670 /* Magic number. */ 1671 /* fall through, both are same length */ 1672 case LCP_OPT_ASYNC_MAP: 1673 /* Async control character map. */ 1674 if (len >= 6 || p[1] == 6) 1675 continue; 1676 if (debug) 1677 addlog("[invalid] "); 1678 break; 1679 case LCP_OPT_MRU: 1680 /* Maximum receive unit. */ 1681 if (len >= 4 && p[1] == 4) 1682 continue; 1683 if (debug) 1684 addlog("[invalid] "); 1685 break; 1686 default: 1687 /* Others not supported. */ 1688 if (debug) 1689 addlog("[rej] "); 1690 break; 1691 } 1692 /* Add the option to rejected list. */ 1693 bcopy (p, r, p[1]); 1694 r += p[1]; 1695 rlen += p[1]; 1696 } 1697 if (rlen) { 1698 if (debug) 1699 addlog(" send conf-rej\n"); 1700 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 1701 return 0; 1702 } else if (debug) 1703 addlog("\n"); 1704 1705 /* 1706 * pass 2: check for option values that are unacceptable and 1707 * thus require to be nak'ed. 1708 */ 1709 if (debug) 1710 addlog("%s%d: lcp parse opt values: ", 1711 ifp->if_name, ifp->if_unit); 1712 1713 p = (void*) (h+1); 1714 len = origlen; 1715 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1716 if (debug) 1717 addlog(" %s ", sppp_lcp_opt_name(*p)); 1718 switch (*p) { 1719 case LCP_OPT_MAGIC: 1720 /* Magic number -- extract. */ 1721 nmagic = (u_long)p[2] << 24 | 1722 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 1723 if (nmagic != sp->lcp.magic) { 1724 if (debug) 1725 addlog("0x%x ", nmagic); 1726 continue; 1727 } 1728 /* 1729 * Local and remote magics equal -- loopback? 1730 */ 1731 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 1732 printf ("\n%s%d: loopback\n", 1733 ifp->if_name, ifp->if_unit); 1734 sp->pp_loopcnt = 0; 1735 if (ifp->if_flags & IFF_UP) { 1736 if_down(ifp); 1737 sppp_qflush(&sp->pp_fastq); 1738 /* XXX ? */ 1739 lcp.Down(sp); 1740 lcp.Up(sp); 1741 } 1742 } else if (debug) 1743 addlog("[glitch] "); 1744 ++sp->pp_loopcnt; 1745 /* 1746 * We negate our magic here, and NAK it. If 1747 * we see it later in an NAK packet, we 1748 * suggest a new one. 1749 */ 1750 nmagic = ~sp->lcp.magic; 1751 /* Gonna NAK it. */ 1752 p[2] = nmagic >> 24; 1753 p[3] = nmagic >> 16; 1754 p[4] = nmagic >> 8; 1755 p[5] = nmagic; 1756 break; 1757 1758 case LCP_OPT_ASYNC_MAP: 1759 /* Async control character map -- check to be zero. */ 1760 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 1761 if (debug) 1762 addlog("[empty] "); 1763 continue; 1764 } 1765 if (debug) 1766 addlog("[non-empty] "); 1767 /* suggest a zero one */ 1768 p[2] = p[3] = p[4] = p[5] = 0; 1769 break; 1770 1771 case LCP_OPT_MRU: 1772 /* 1773 * Maximum receive unit. Always agreeable, 1774 * but ignored by now. 1775 */ 1776 sp->lcp.their_mru = p[2] * 256 + p[3]; 1777 if (debug) 1778 addlog("%d ", sp->lcp.their_mru); 1779 continue; 1780 } 1781 /* Add the option to nak'ed list. */ 1782 bcopy (p, r, p[1]); 1783 r += p[1]; 1784 rlen += p[1]; 1785 } 1786 if (rlen) { 1787 if (debug) 1788 addlog(" send conf-nak\n"); 1789 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 1790 return 0; 1791 } else { 1792 if (debug) 1793 addlog(" send conf-ack\n"); 1794 sp->pp_loopcnt = 0; 1795 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 1796 h->ident, origlen, h+1); 1797 } 1798 1799 free (buf, M_TEMP); 1800 return (rlen == 0); 1801} 1802 1803/* 1804 * Analyze the LCP Configure-Reject option list, and adjust our 1805 * negotiation. 1806 */ 1807static void 1808sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 1809{ 1810 STDDCL; 1811 u_char *buf, *p; 1812 1813 len -= 4; 1814 buf = malloc (len, M_TEMP, M_NOWAIT); 1815 if (!buf) 1816 return; 1817 1818 if (debug) 1819 log(LOG_DEBUG, "%s%d: lcp rej opts: ", 1820 ifp->if_name, ifp->if_unit); 1821 1822 p = (void*) (h+1); 1823 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 1824 if (debug) 1825 addlog(" %s ", sppp_lcp_opt_name(*p)); 1826 switch (*p) { 1827 case LCP_OPT_MAGIC: 1828 /* Magic number -- can't use it, use 0 */ 1829 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 1830 sp->lcp.magic = 0; 1831 break; 1832 case LCP_OPT_MRU: 1833 /* 1834 * Should not be rejected anyway, since we only 1835 * negotiate a MRU if explicitly requested by 1836 * peer. 1837 */ 1838 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 1839 break; 1840 } 1841 } 1842 if (debug) 1843 addlog("\n"); 1844 free (buf, M_TEMP); 1845 return; 1846} 1847 1848/* 1849 * Analyze the LCP Configure-NAK option list, and adjust our 1850 * negotiation. 1851 */ 1852static void 1853sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 1854{ 1855 STDDCL; 1856 u_char *buf, *p; 1857 u_long magic; 1858 1859 len -= 4; 1860 buf = malloc (len, M_TEMP, M_NOWAIT); 1861 if (!buf) 1862 return; 1863 1864 if (debug) 1865 log(LOG_DEBUG, "%s%d: lcp nak opts: ", 1866 ifp->if_name, ifp->if_unit); 1867 1868 p = (void*) (h+1); 1869 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 1870 if (debug) 1871 addlog(" %s ", sppp_lcp_opt_name(*p)); 1872 switch (*p) { 1873 case LCP_OPT_MAGIC: 1874 /* Magic number -- renegotiate */ 1875 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 1876 len >= 6 && p[1] == 6) { 1877 magic = (u_long)p[2] << 24 | 1878 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 1879 /* 1880 * If the remote magic is our negated one, 1881 * this looks like a loopback problem. 1882 * Suggest a new magic to make sure. 1883 */ 1884 if (magic == ~sp->lcp.magic) { 1885 if (debug) 1886 addlog("magic glitch "); 1887 sp->lcp.magic += time.tv_sec + time.tv_usec; 1888 } else { 1889 sp->lcp.magic = magic; 1890 if (debug) 1891 addlog("%d "); 1892 } 1893 } 1894 break; 1895 case LCP_OPT_MRU: 1896 /* 1897 * Peer wants to advise us to negotiate an MRU. 1898 * Agree on it if it's reasonable, or use 1899 * default otherwise. 1900 */ 1901 if (len >= 4 && p[1] == 4) { 1902 u_int mru = p[2] * 256 + p[3]; 1903 if (debug) 1904 addlog("%d ", mru); 1905 if (mru < PP_MTU || mru > PP_MAX_MRU) 1906 mru = PP_MTU; 1907 sp->lcp.mru = mru; 1908 sp->lcp.opts |= (1 << LCP_OPT_MRU); 1909 } 1910 break; 1911 } 1912 } 1913 if (debug) 1914 addlog("\n"); 1915 free (buf, M_TEMP); 1916 return; 1917} 1918 1919static void 1920sppp_lcp_tlu(struct sppp *sp) 1921{ 1922 STDDCL; 1923 int i; 1924 u_long mask; 1925 1926 /* XXX ? */ 1927 if (! (ifp->if_flags & IFF_UP) && 1928 (ifp->if_flags & IFF_RUNNING)) { 1929 /* Coming out of loopback mode. */ 1930 if_up(ifp); 1931 printf ("%s%d: up\n", ifp->if_name, ifp->if_unit); 1932 } 1933 1934 for (i = 0; i < IDX_COUNT; i++) 1935 if ((cps[i])->flags & CP_QUAL) 1936 (cps[i])->Open(sp); 1937 1938 if (/* require authentication XXX */ 0) 1939 sp->pp_phase = PHASE_AUTHENTICATE; 1940 else 1941 sp->pp_phase = PHASE_NETWORK; 1942 1943 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 1944 sppp_phase_name(sp->pp_phase)); 1945 1946 if (sp->pp_phase == PHASE_AUTHENTICATE) { 1947 for (i = 0; i < IDX_COUNT; i++) 1948 if ((cps[i])->flags & CP_AUTH) 1949 (cps[i])->Open(sp); 1950 } else { 1951 /* Notify all NCPs. */ 1952 for (i = 0; i < IDX_COUNT; i++) 1953 if ((cps[i])->flags & CP_NCP) 1954 (cps[i])->Open(sp); 1955 } 1956 1957 /* Send Up events to all started protos. */ 1958 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 1959 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) 1960 (cps[i])->Up(sp); 1961 1962 if (sp->pp_phase == PHASE_NETWORK) 1963 /* if no NCP is starting, close down */ 1964 sppp_lcp_check(sp); 1965} 1966 1967static void 1968sppp_lcp_tld(struct sppp *sp) 1969{ 1970 STDDCL; 1971 int i; 1972 u_long mask; 1973 1974 sp->pp_phase = PHASE_TERMINATE; 1975 1976 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 1977 sppp_phase_name(sp->pp_phase)); 1978 1979 /* 1980 * Take upper layers down. We send the Down event first and 1981 * the Close second to prevent the upper layers from sending 1982 * ``a flurry of terminate-request packets'', as the RFC 1983 * describes it. 1984 */ 1985 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 1986 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) { 1987 (cps[i])->Down(sp); 1988 (cps[i])->Close(sp); 1989 } 1990} 1991 1992static void 1993sppp_lcp_tls(struct sppp *sp) 1994{ 1995 STDDCL; 1996 1997 sp->pp_phase = PHASE_ESTABLISH; 1998 1999 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2000 sppp_phase_name(sp->pp_phase)); 2001 2002 /* Notify lower layer if desired. */ 2003 if (sp->pp_tls) 2004 (sp->pp_tls)(sp); 2005} 2006 2007static void 2008sppp_lcp_tlf(struct sppp *sp) 2009{ 2010 STDDCL; 2011 2012 sp->pp_phase = PHASE_DEAD; 2013 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2014 sppp_phase_name(sp->pp_phase)); 2015 2016 /* Notify lower layer if desired. */ 2017 if (sp->pp_tlf) 2018 (sp->pp_tlf)(sp); 2019} 2020 2021static void 2022sppp_lcp_scr(struct sppp *sp) 2023{ 2024 char opt[6 /* magicnum */ + 4 /* mru */]; 2025 int i = 0; 2026 2027 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2028 if (! sp->lcp.magic) 2029 sp->lcp.magic = time.tv_sec + time.tv_usec; 2030 opt[i++] = LCP_OPT_MAGIC; 2031 opt[i++] = 6; 2032 opt[i++] = sp->lcp.magic >> 24; 2033 opt[i++] = sp->lcp.magic >> 16; 2034 opt[i++] = sp->lcp.magic >> 8; 2035 opt[i++] = sp->lcp.magic; 2036 } 2037 2038 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2039 opt[i++] = LCP_OPT_MRU; 2040 opt[i++] = 4; 2041 opt[i++] = sp->lcp.mru >> 8; 2042 opt[i++] = sp->lcp.mru; 2043 } 2044 2045 sp->confid[IDX_LCP] = ++sp->pp_seq; 2046 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2047} 2048 2049/* 2050 * Re-check the open NCPs and see if we should terminate the link. 2051 * Called by the NCPs during their tlf action handling. 2052 */ 2053static void 2054sppp_lcp_check(struct sppp *sp) 2055{ 2056 int i, mask; 2057 2058 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2059 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP) 2060 return; 2061 lcp.Close(sp); 2062} 2063/* 2064 *--------------------------------------------------------------------------* 2065 * * 2066 * The IPCP implementation. * 2067 * * 2068 *--------------------------------------------------------------------------* 2069 */ 2070 2071static void 2072sppp_ipcp_init(struct sppp *sp) 2073{ 2074 sp->ipcp.opts = 0; 2075 sp->ipcp.flags = 0; 2076 sp->state[IDX_IPCP] = STATE_INITIAL; 2077 sp->fail_counter[IDX_IPCP] = 0; 2078} 2079 2080static void 2081sppp_ipcp_up(struct sppp *sp) 2082{ 2083 sppp_up_event(&ipcp, sp); 2084} 2085 2086static void 2087sppp_ipcp_down(struct sppp *sp) 2088{ 2089 sppp_down_event(&ipcp, sp); 2090} 2091 2092static void 2093sppp_ipcp_open(struct sppp *sp) 2094{ 2095 STDDCL; 2096 u_long myaddr, hisaddr; 2097 2098 sppp_get_ip_addrs(sp, &myaddr, &hisaddr); 2099 /* 2100 * If we don't have his address, this probably means our 2101 * interface doesn't want to talk IP at all. (This could 2102 * be the case if somebody wants to speak only IPX, for 2103 * example.) Don't open IPCP in this case. 2104 */ 2105 if (hisaddr == 0L) { 2106 /* XXX this message should go away */ 2107 if (debug) 2108 log(LOG_DEBUG, "%s%d: ipcp_open(): no IP interface\n", 2109 ifp->if_name, ifp->if_unit); 2110 return; 2111 } 2112 2113 if (myaddr == 0L) { 2114 /* 2115 * I don't have an assigned address, so i need to 2116 * negotiate my address. 2117 */ 2118 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2119 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2120 } 2121 sppp_open_event(&ipcp, sp); 2122} 2123 2124static void 2125sppp_ipcp_close(struct sppp *sp) 2126{ 2127 sppp_close_event(&ipcp, sp); 2128 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2129 /* 2130 * My address was dynamic, clear it again. 2131 */ 2132 sppp_set_ip_addr(sp, 0L); 2133} 2134 2135static void 2136sppp_ipcp_TO(void *cookie) 2137{ 2138 sppp_to_event(&ipcp, (struct sppp *)cookie); 2139} 2140 2141/* 2142 * Analyze a configure request. Return true if it was agreeable, and 2143 * caused action sca, false if it has been rejected or nak'ed, and 2144 * caused action scn. (The return value is used to make the state 2145 * transition decision in the state automaton.) 2146 */ 2147static int 2148sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2149{ 2150 u_char *buf, *r, *p; 2151 struct ifnet *ifp = &sp->pp_if; 2152 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2153 u_long hisaddr, desiredaddr; 2154 2155 len -= 4; 2156 origlen = len; 2157 /* 2158 * Make sure to allocate a buf that can at least hold a 2159 * conf-nak with an `address' option. We might need it below. 2160 */ 2161 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2162 if (! buf) 2163 return (0); 2164 2165 /* pass 1: see if we can recognize them */ 2166 if (debug) 2167 log(LOG_DEBUG, "%s%d: ipcp parse opts: ", 2168 ifp->if_name, ifp->if_unit); 2169 p = (void*) (h+1); 2170 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2171 if (debug) 2172 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2173 switch (*p) { 2174#ifdef notyet 2175 case IPCP_OPT_COMPRESSION: 2176 if (len >= 6 && p[1] >= 6) { 2177 /* correctly formed compress option */ 2178 continue; 2179 } 2180 if (debug) 2181 addlog("[invalid] "); 2182 break; 2183#endif 2184 case IPCP_OPT_ADDRESS: 2185 if (len >= 6 && p[1] == 6) { 2186 /* correctly formed address option */ 2187 continue; 2188 } 2189 if (debug) 2190 addlog("[invalid] "); 2191 break; 2192 default: 2193 /* Others not supported. */ 2194 if (debug) 2195 addlog("[rej] "); 2196 break; 2197 } 2198 /* Add the option to rejected list. */ 2199 bcopy (p, r, p[1]); 2200 r += p[1]; 2201 rlen += p[1]; 2202 } 2203 if (rlen) { 2204 if (debug) 2205 addlog(" send conf-rej\n"); 2206 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2207 return 0; 2208 } else if (debug) 2209 addlog("\n"); 2210 2211 /* pass 2: parse option values */ 2212 sppp_get_ip_addrs(sp, 0, &hisaddr); 2213 if (debug) 2214 addlog("%s%d: ipcp parse opt values: ", ifp->if_name, ifp->if_unit); 2215 p = (void*) (h+1); 2216 len = origlen; 2217 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2218 if (debug) 2219 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2220 switch (*p) { 2221#ifdef notyet 2222 case IPCP_OPT_COMPRESSION: 2223 continue; 2224#endif 2225 case IPCP_OPT_ADDRESS: 2226 desiredaddr = p[2] << 24 | p[3] << 16 | 2227 p[4] << 8 | p[5]; 2228 if (desiredaddr == hisaddr) { 2229 /* 2230 * Peer's address is same as our value, 2231 * this is agreeable. Gonna conf-ack 2232 * it. 2233 */ 2234 if (debug) 2235 addlog("0x%x [ack] ", hisaddr); 2236 /* record that we've seen it already */ 2237 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2238 continue; 2239 } 2240 /* 2241 * The address wasn't agreeable. This is either 2242 * he sent us 0.0.0.0, asking to assign him an 2243 * address, or he send us another address not 2244 * matching our value. Either case, we gonna 2245 * conf-nak it with our value. 2246 */ 2247 if (debug) { 2248 if (desiredaddr == 0) 2249 addlog("[addr requested] "); 2250 else 2251 addlog("0x%x [not agreed] ", 2252 desiredaddr); 2253 2254 p[2] = hisaddr >> 24; 2255 p[3] = hisaddr >> 16; 2256 p[4] = hisaddr >> 8; 2257 p[5] = hisaddr; 2258 } 2259 break; 2260 } 2261 /* Add the option to nak'ed list. */ 2262 bcopy (p, r, p[1]); 2263 r += p[1]; 2264 rlen += p[1]; 2265 } 2266 2267 /* 2268 * If we are about to conf-ack the request, but haven't seen 2269 * his address so far, gonna conf-nak it instead, with the 2270 * `address' option present and our idea of his address being 2271 * filled in there, to request negotiation of both addresses. 2272 * 2273 * XXX This can result in an endless req - nak loop if peer 2274 * doesn't want to send us his address. Q: What should we do 2275 * about it? XXX A: implement the max-failure counter. 2276 */ 2277 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2278 buf[0] = IPCP_OPT_ADDRESS; 2279 buf[1] = 6; 2280 buf[2] = hisaddr >> 24; 2281 buf[3] = hisaddr >> 16; 2282 buf[4] = hisaddr >> 8; 2283 buf[5] = hisaddr; 2284 rlen = 6; 2285 if (debug) 2286 addlog("still need hisaddr "); 2287 } 2288 2289 if (rlen) { 2290 if (debug) 2291 addlog(" send conf-nak\n"); 2292 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2293 } else { 2294 if (debug) 2295 addlog(" send conf-ack\n"); 2296 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2297 h->ident, origlen, h+1); 2298 } 2299 2300 free (buf, M_TEMP); 2301 return (rlen == 0); 2302} 2303 2304/* 2305 * Analyze the IPCP Configure-Reject option list, and adjust our 2306 * negotiation. 2307 */ 2308static void 2309sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2310{ 2311 u_char *buf, *p; 2312 struct ifnet *ifp = &sp->pp_if; 2313 int debug = ifp->if_flags & IFF_DEBUG; 2314 2315 len -= 4; 2316 buf = malloc (len, M_TEMP, M_NOWAIT); 2317 if (!buf) 2318 return; 2319 2320 if (debug) 2321 log(LOG_DEBUG, "%s%d: ipcp rej opts: ", 2322 ifp->if_name, ifp->if_unit); 2323 2324 p = (void*) (h+1); 2325 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2326 if (debug) 2327 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2328 switch (*p) { 2329 case IPCP_OPT_ADDRESS: 2330 /* 2331 * Peer doesn't grok address option. This is 2332 * bad. XXX Should we better give up here? 2333 */ 2334 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2335 break; 2336#ifdef notyet 2337 case IPCP_OPT_COMPRESS: 2338 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2339 break; 2340#endif 2341 } 2342 } 2343 if (debug) 2344 addlog("\n"); 2345 free (buf, M_TEMP); 2346 return; 2347} 2348 2349/* 2350 * Analyze the IPCP Configure-NAK option list, and adjust our 2351 * negotiation. 2352 */ 2353static void 2354sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2355{ 2356 u_char *buf, *p; 2357 struct ifnet *ifp = &sp->pp_if; 2358 int debug = ifp->if_flags & IFF_DEBUG; 2359 u_long wantaddr; 2360 2361 len -= 4; 2362 buf = malloc (len, M_TEMP, M_NOWAIT); 2363 if (!buf) 2364 return; 2365 2366 if (debug) 2367 log(LOG_DEBUG, "%s%d: ipcp nak opts: ", 2368 ifp->if_name, ifp->if_unit); 2369 2370 p = (void*) (h+1); 2371 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2372 if (debug) 2373 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2374 switch (*p) { 2375 case IPCP_OPT_ADDRESS: 2376 /* 2377 * Peer doesn't like our local IP address. See 2378 * if we can do something for him. We'll drop 2379 * him our address then. 2380 */ 2381 if (len >= 6 && p[1] == 6) { 2382 wantaddr = p[2] << 24 | p[3] << 16 | 2383 p[4] << 8 | p[5]; 2384 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2385 if (debug) 2386 addlog("[wantaddr 0x%x] ", wantaddr); 2387 /* 2388 * When doing dynamic address assignment, 2389 * we accept his offer. Otherwise, we 2390 * ignore it and thus continue to negotiate 2391 * our already existing value. 2392 */ 2393 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2394 sppp_set_ip_addr(sp, wantaddr); 2395 if (debug) 2396 addlog("[agree] "); 2397 } 2398 } 2399 break; 2400#ifdef notyet 2401 case IPCP_OPT_COMPRESS: 2402 /* 2403 * Peer wants different compression parameters. 2404 */ 2405 break; 2406#endif 2407 } 2408 } 2409 if (debug) 2410 addlog("\n"); 2411 free (buf, M_TEMP); 2412 return; 2413} 2414 2415static void 2416sppp_ipcp_tlu(struct sppp *sp) 2417{ 2418} 2419 2420static void 2421sppp_ipcp_tld(struct sppp *sp) 2422{ 2423} 2424 2425static void 2426sppp_ipcp_tls(struct sppp *sp) 2427{ 2428 /* indicate to LCP that it must stay alive */ 2429 sp->lcp.protos |= (1 << IDX_IPCP); 2430} 2431 2432static void 2433sppp_ipcp_tlf(struct sppp *sp) 2434{ 2435 /* we no longer need LCP */ 2436 sp->lcp.protos &= ~(1 << IDX_IPCP); 2437 sppp_lcp_check(sp); 2438} 2439 2440static void 2441sppp_ipcp_scr(struct sppp *sp) 2442{ 2443 char opt[6 /* compression */ + 6 /* address */]; 2444 u_long ouraddr; 2445 int i = 0; 2446 2447#ifdef notyet 2448 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 2449 opt[i++] = IPCP_OPT_COMPRESSION; 2450 opt[i++] = 6; 2451 opt[i++] = 0; /* VJ header compression */ 2452 opt[i++] = 0x2d; /* VJ header compression */ 2453 opt[i++] = max_slot_id; 2454 opt[i++] = comp_slot_id; 2455 } 2456#endif 2457 2458 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 2459 sppp_get_ip_addrs(sp, &ouraddr, 0); 2460 opt[i++] = IPCP_OPT_ADDRESS; 2461 opt[i++] = 6; 2462 opt[i++] = ouraddr >> 24; 2463 opt[i++] = ouraddr >> 16; 2464 opt[i++] = ouraddr >> 8; 2465 opt[i++] = ouraddr; 2466 } 2467 2468 sp->confid[IDX_IPCP] = ++sp->pp_seq; 2469 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 2470} 2471 2472 2473/* 2474 * Random miscellaneous functions. 2475 */ 2476 2477/* 2478 * Flush interface queue. 2479 */ 2480static void 2481sppp_qflush(struct ifqueue *ifq) 2482{ 2483 struct mbuf *m, *n; 2484 2485 n = ifq->ifq_head; 2486 while ((m = n)) { 2487 n = m->m_act; 2488 m_freem (m); 2489 } 2490 ifq->ifq_head = 0; 2491 ifq->ifq_tail = 0; 2492 ifq->ifq_len = 0; 2493} 2494 2495/* 2496 * Send keepalive packets, every 10 seconds. 2497 */ 2498static void 2499sppp_keepalive(void *dummy) 2500{ 2501 struct sppp *sp; 2502 int s; 2503 2504 s = splimp(); 2505 for (sp=spppq; sp; sp=sp->pp_next) { 2506 struct ifnet *ifp = &sp->pp_if; 2507 2508 /* Keepalive mode disabled or channel down? */ 2509 if (! (sp->pp_flags & PP_KEEPALIVE) || 2510 ! (ifp->if_flags & IFF_RUNNING)) 2511 continue; 2512 2513 /* No keepalive in PPP mode if LCP not opened yet. */ 2514 if (! (sp->pp_flags & PP_CISCO) && 2515 sp->pp_phase < PHASE_AUTHENTICATE) 2516 continue; 2517 2518 if (sp->pp_alivecnt == MAXALIVECNT) { 2519 /* No keepalive packets got. Stop the interface. */ 2520 printf ("%s%d: down\n", ifp->if_name, ifp->if_unit); 2521 if_down (ifp); 2522 sppp_qflush (&sp->pp_fastq); 2523 if (! (sp->pp_flags & PP_CISCO)) { 2524 /* XXX */ 2525 /* Shut down the PPP link. */ 2526 lcp.Down(sp); 2527 /* Initiate negotiation. XXX */ 2528 lcp.Up(sp); 2529 } 2530 } 2531 if (sp->pp_alivecnt <= MAXALIVECNT) 2532 ++sp->pp_alivecnt; 2533 if (sp->pp_flags & PP_CISCO) 2534 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, 2535 sp->pp_rseq); 2536 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 2537 long nmagic = htonl (sp->lcp.magic); 2538 sp->lcp.echoid = ++sp->pp_seq; 2539 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 2540 sp->lcp.echoid, 4, &nmagic); 2541 } 2542 } 2543 splx(s); 2544 timeout(sppp_keepalive, 0, hz * 10); 2545} 2546 2547/* 2548 * Get both IP addresses. 2549 */ 2550static void 2551sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst) 2552{ 2553 struct ifnet *ifp = &sp->pp_if; 2554 struct ifaddr *ifa; 2555 struct sockaddr_in *si; 2556 u_long ssrc, ddst; 2557 2558 ssrc = ddst = 0L; 2559 /* 2560 * Pick the first AF_INET address from the list, 2561 * aliases don't make any sense on a p2p link anyway. 2562 */ 2563 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 2564 ifa; 2565 ifa = ifa->ifa_link.tqe_next) 2566 if (ifa->ifa_addr->sa_family == AF_INET) { 2567 si = (struct sockaddr_in *)ifa->ifa_addr; 2568 if (si) 2569 break; 2570 } 2571 if (ifa) { 2572 if (si && si->sin_addr.s_addr) 2573 ssrc = si->sin_addr.s_addr; 2574 2575 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 2576 if (si && si->sin_addr.s_addr) 2577 ddst = si->sin_addr.s_addr; 2578 } 2579 2580 if (dst) *dst = ntohl(ddst); 2581 if (src) *src = ntohl(ssrc); 2582} 2583 2584/* 2585 * Set my IP address. Must be called at splimp. 2586 */ 2587static void 2588sppp_set_ip_addr(struct sppp *sp, u_long src) 2589{ 2590 struct ifnet *ifp = &sp->pp_if; 2591 struct ifaddr *ifa; 2592 struct sockaddr_in *si; 2593 u_long ssrc, ddst; 2594 2595 /* 2596 * Pick the first AF_INET address from the list, 2597 * aliases don't make any sense on a p2p link anyway. 2598 */ 2599 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 2600 ifa; 2601 ifa = ifa->ifa_link.tqe_next) 2602 if (ifa->ifa_addr->sa_family == AF_INET) { 2603 si = (struct sockaddr_in *)ifa->ifa_addr; 2604 if (si) 2605 break; 2606 } 2607 if (ifa && si) 2608 si->sin_addr.s_addr = htonl(src); 2609} 2610 2611static const char * 2612sppp_cp_type_name(u_char type) 2613{ 2614 static char buf [12]; 2615 switch (type) { 2616 case CONF_REQ: return ("conf-req"); 2617 case CONF_ACK: return ("conf-ack"); 2618 case CONF_NAK: return ("conf-nak"); 2619 case CONF_REJ: return ("conf-rej"); 2620 case TERM_REQ: return ("term-req"); 2621 case TERM_ACK: return ("term-ack"); 2622 case CODE_REJ: return ("code-rej"); 2623 case PROTO_REJ: return ("proto-rej"); 2624 case ECHO_REQ: return ("echo-req"); 2625 case ECHO_REPLY: return ("echo-reply"); 2626 case DISC_REQ: return ("discard-req"); 2627 } 2628 sprintf (buf, "0x%x", type); 2629 return (buf); 2630} 2631 2632static const char * 2633sppp_lcp_opt_name(u_char opt) 2634{ 2635 static char buf [12]; 2636 switch (opt) { 2637 case LCP_OPT_MRU: return ("mru"); 2638 case LCP_OPT_ASYNC_MAP: return ("async-map"); 2639 case LCP_OPT_AUTH_PROTO: return ("auth-proto"); 2640 case LCP_OPT_QUAL_PROTO: return ("qual-proto"); 2641 case LCP_OPT_MAGIC: return ("magic"); 2642 case LCP_OPT_PROTO_COMP: return ("proto-comp"); 2643 case LCP_OPT_ADDR_COMP: return ("addr-comp"); 2644 } 2645 sprintf (buf, "0x%x", opt); 2646 return (buf); 2647} 2648 2649static const char * 2650sppp_ipcp_opt_name(u_char opt) 2651{ 2652 static char buf [12]; 2653 switch (opt) { 2654 case IPCP_OPT_ADDRESSES: return ("addresses"); 2655 case IPCP_OPT_COMPRESSION: return ("compression"); 2656 case IPCP_OPT_ADDRESS: return ("address"); 2657 } 2658 sprintf (buf, "0x%x", opt); 2659 return (buf); 2660} 2661 2662static const char * 2663sppp_state_name(int state) 2664{ 2665 switch (state) { 2666 case STATE_INITIAL: return "initial"; 2667 case STATE_STARTING: return "starting"; 2668 case STATE_CLOSED: return "closed"; 2669 case STATE_STOPPED: return "stopped"; 2670 case STATE_CLOSING: return "closing"; 2671 case STATE_STOPPING: return "stopping"; 2672 case STATE_REQ_SENT: return "req-sent"; 2673 case STATE_ACK_RCVD: return "ack-rcvd"; 2674 case STATE_ACK_SENT: return "ack-sent"; 2675 case STATE_OPENED: return "opened"; 2676 } 2677 return "illegal"; 2678} 2679 2680static const char * 2681sppp_phase_name(enum ppp_phase phase) 2682{ 2683 switch (phase) { 2684 case PHASE_DEAD: return "dead"; 2685 case PHASE_ESTABLISH: return "establish"; 2686 case PHASE_TERMINATE: return "terminate"; 2687 case PHASE_AUTHENTICATE: return "authenticate"; 2688 case PHASE_NETWORK: return "network"; 2689 } 2690 return "illegal"; 2691} 2692 2693static const char * 2694sppp_proto_name(u_short proto) 2695{ 2696 static char buf[12]; 2697 switch (proto) { 2698 case PPP_LCP: return "lcp"; 2699 case PPP_IPCP: return "ipcp"; 2700 } 2701 sprintf(buf, "0x%x", (unsigned)proto); 2702 return buf; 2703} 2704 2705static void 2706sppp_print_bytes(u_char *p, u_short len) 2707{ 2708 addlog(" %x", *p++); 2709 while (--len > 0) 2710 addlog("-%x", *p++); 2711} 2712 2713/* 2714 * This file is large. Tell emacs to highlight it nevertheless. 2715 * 2716 * Local Variables: 2717 * hilit-auto-highlight-maxout: 100000 2718 * End: 2719 */ 2720