if_spppsubr.c revision 38372
1/* 2 * Synchronous PPP/Cisco link level subroutines. 3 * Keepalive protocol implemented in both Cisco and PPP modes. 4 * 5 * Copyright (C) 1994-1996 Cronyx Engineering 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 2.4, Thu Apr 30 17:17:21 MSD 1997 19 * 20 * $Id: if_spppsubr.c,v 1.41 1998/08/15 21:58:09 bde Exp $ 21 */ 22 23#include "opt_inet.h" 24#include "opt_ipx.h" 25 26#include <sys/param.h> 27#include <sys/systm.h> 28#include <sys/kernel.h> 29#include <sys/sockio.h> 30#include <sys/socket.h> 31#include <sys/syslog.h> 32#include <sys/malloc.h> 33#include <sys/mbuf.h> 34#include <sys/md5.h> 35 36#include <net/if.h> 37#include <net/netisr.h> 38#include <net/if_types.h> 39 40#include <machine/stdarg.h> 41#include <machine/random.h> 42 43#ifdef INET 44#include <netinet/in.h> 45#include <netinet/in_systm.h> 46#include <netinet/in_var.h> 47#include <netinet/ip.h> 48#include <netinet/tcp.h> 49#include <netinet/if_ether.h> 50#else 51#error Huh? sppp without INET? 52#endif 53 54#ifdef IPX 55#include <netipx/ipx.h> 56#include <netipx/ipx_if.h> 57#endif 58 59#ifdef NS 60#include <netns/ns.h> 61#include <netns/ns_if.h> 62#endif 63 64#ifdef ISO 65#include <netiso/argo_debug.h> 66#include <netiso/iso.h> 67#include <netiso/iso_var.h> 68#include <netiso/iso_snpac.h> 69#endif 70 71#include <net/if_sppp.h> 72 73#define MAXALIVECNT 3 /* max. alive packets */ 74 75/* 76 * Interface flags that can be set in an ifconfig command. 77 * 78 * Setting link0 will make the link passive, i.e. it will be marked 79 * as being administrative openable, but won't be opened to begin 80 * with. Incoming calls will be answered, or subsequent calls with 81 * -link1 will cause the administrative open of the LCP layer. 82 * 83 * Setting link1 will cause the link to auto-dial only as packets 84 * arrive to be sent. 85 * 86 * Setting IFF_DEBUG will syslog the option negotiation and state 87 * transitions at level kern.debug. Note: all logs consistently look 88 * like 89 * 90 * <if-name><unit>: <proto-name> <additional info...> 91 * 92 * with <if-name><unit> being something like "bppp0", and <proto-name> 93 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 94 */ 95 96#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 97#define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 98 99#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 100#define PPP_UI 0x03 /* Unnumbered Information */ 101#define PPP_IP 0x0021 /* Internet Protocol */ 102#define PPP_ISO 0x0023 /* ISO OSI Protocol */ 103#define PPP_XNS 0x0025 /* Xerox NS Protocol */ 104#define PPP_IPX 0x002b /* Novell IPX Protocol */ 105#define PPP_LCP 0xc021 /* Link Control Protocol */ 106#define PPP_PAP 0xc023 /* Password Authentication Protocol */ 107#define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */ 108#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 109 110#define CONF_REQ 1 /* PPP configure request */ 111#define CONF_ACK 2 /* PPP configure acknowledge */ 112#define CONF_NAK 3 /* PPP configure negative ack */ 113#define CONF_REJ 4 /* PPP configure reject */ 114#define TERM_REQ 5 /* PPP terminate request */ 115#define TERM_ACK 6 /* PPP terminate acknowledge */ 116#define CODE_REJ 7 /* PPP code reject */ 117#define PROTO_REJ 8 /* PPP protocol reject */ 118#define ECHO_REQ 9 /* PPP echo request */ 119#define ECHO_REPLY 10 /* PPP echo reply */ 120#define DISC_REQ 11 /* PPP discard request */ 121 122#define LCP_OPT_MRU 1 /* maximum receive unit */ 123#define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 124#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 125#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 126#define LCP_OPT_MAGIC 5 /* magic number */ 127#define LCP_OPT_RESERVED 6 /* reserved */ 128#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 129#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 130 131#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 132#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 133#define IPCP_OPT_ADDRESS 3 /* local IP address */ 134 135#define PAP_REQ 1 /* PAP name/password request */ 136#define PAP_ACK 2 /* PAP acknowledge */ 137#define PAP_NAK 3 /* PAP fail */ 138 139#define CHAP_CHALLENGE 1 /* CHAP challenge request */ 140#define CHAP_RESPONSE 2 /* CHAP challenge response */ 141#define CHAP_SUCCESS 3 /* CHAP response ok */ 142#define CHAP_FAILURE 4 /* CHAP response failed */ 143 144#define CHAP_MD5 5 /* hash algorithm - MD5 */ 145 146#define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 147#define CISCO_UNICAST 0x0f /* Cisco unicast address */ 148#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 149#define CISCO_ADDR_REQ 0 /* Cisco address request */ 150#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 151#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 152 153/* states are named and numbered according to RFC 1661 */ 154#define STATE_INITIAL 0 155#define STATE_STARTING 1 156#define STATE_CLOSED 2 157#define STATE_STOPPED 3 158#define STATE_CLOSING 4 159#define STATE_STOPPING 5 160#define STATE_REQ_SENT 6 161#define STATE_ACK_RCVD 7 162#define STATE_ACK_SENT 8 163#define STATE_OPENED 9 164 165struct ppp_header { 166 u_char address; 167 u_char control; 168 u_short protocol; 169}; 170#define PPP_HEADER_LEN sizeof (struct ppp_header) 171 172struct lcp_header { 173 u_char type; 174 u_char ident; 175 u_short len; 176}; 177#define LCP_HEADER_LEN sizeof (struct lcp_header) 178 179struct cisco_packet { 180 u_long type; 181 u_long par1; 182 u_long par2; 183 u_short rel; 184 u_short time0; 185 u_short time1; 186}; 187#define CISCO_PACKET_LEN 18 188 189/* 190 * We follow the spelling and capitalization of RFC 1661 here, to make 191 * it easier comparing with the standard. Please refer to this RFC in 192 * case you can't make sense out of these abbreviation; it will also 193 * explain the semantics related to the various events and actions. 194 */ 195struct cp { 196 u_short proto; /* PPP control protocol number */ 197 u_char protoidx; /* index into state table in struct sppp */ 198 u_char flags; 199#define CP_LCP 0x01 /* this is the LCP */ 200#define CP_AUTH 0x02 /* this is an authentication protocol */ 201#define CP_NCP 0x04 /* this is a NCP */ 202#define CP_QUAL 0x08 /* this is a quality reporting protocol */ 203 const char *name; /* name of this control protocol */ 204 /* event handlers */ 205 void (*Up)(struct sppp *sp); 206 void (*Down)(struct sppp *sp); 207 void (*Open)(struct sppp *sp); 208 void (*Close)(struct sppp *sp); 209 void (*TO)(void *sp); 210 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 211 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 212 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 213 /* actions */ 214 void (*tlu)(struct sppp *sp); 215 void (*tld)(struct sppp *sp); 216 void (*tls)(struct sppp *sp); 217 void (*tlf)(struct sppp *sp); 218 void (*scr)(struct sppp *sp); 219}; 220 221static struct sppp *spppq; 222static struct callout_handle keepalive_ch; 223 224/* 225 * The following disgusting hack gets around the problem that IP TOS 226 * can't be set yet. We want to put "interactive" traffic on a high 227 * priority queue. To decide if traffic is interactive, we check that 228 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 229 * 230 * XXX is this really still necessary? - joerg - 231 */ 232static u_short interactive_ports[8] = { 233 0, 513, 0, 0, 234 0, 21, 0, 23, 235}; 236#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 237 238/* almost every function needs these */ 239#define STDDCL \ 240 struct ifnet *ifp = &sp->pp_if; \ 241 int debug = ifp->if_flags & IFF_DEBUG 242 243static int sppp_output(struct ifnet *ifp, struct mbuf *m, 244 struct sockaddr *dst, struct rtentry *rt); 245 246static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 247static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 248 249static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 250 struct mbuf *m); 251static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 252 u_char ident, u_short len, void *data); 253static void sppp_cp_timeout(void *arg); 254static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 255 int newstate); 256static void sppp_auth_send(const struct cp *cp, 257 struct sppp *sp, u_char type, u_char id, 258 ...); 259 260static void sppp_up_event(const struct cp *cp, struct sppp *sp); 261static void sppp_down_event(const struct cp *cp, struct sppp *sp); 262static void sppp_open_event(const struct cp *cp, struct sppp *sp); 263static void sppp_close_event(const struct cp *cp, struct sppp *sp); 264static void sppp_to_event(const struct cp *cp, struct sppp *sp); 265 266static void sppp_null(struct sppp *sp); 267 268static void sppp_lcp_init(struct sppp *sp); 269static void sppp_lcp_up(struct sppp *sp); 270static void sppp_lcp_down(struct sppp *sp); 271static void sppp_lcp_open(struct sppp *sp); 272static void sppp_lcp_close(struct sppp *sp); 273static void sppp_lcp_TO(void *sp); 274static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 275static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 276static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 277static void sppp_lcp_tlu(struct sppp *sp); 278static void sppp_lcp_tld(struct sppp *sp); 279static void sppp_lcp_tls(struct sppp *sp); 280static void sppp_lcp_tlf(struct sppp *sp); 281static void sppp_lcp_scr(struct sppp *sp); 282static void sppp_lcp_check_and_close(struct sppp *sp); 283static int sppp_ncp_check(struct sppp *sp); 284 285static void sppp_ipcp_init(struct sppp *sp); 286static void sppp_ipcp_up(struct sppp *sp); 287static void sppp_ipcp_down(struct sppp *sp); 288static void sppp_ipcp_open(struct sppp *sp); 289static void sppp_ipcp_close(struct sppp *sp); 290static void sppp_ipcp_TO(void *sp); 291static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 292static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 293static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 294static void sppp_ipcp_tlu(struct sppp *sp); 295static void sppp_ipcp_tld(struct sppp *sp); 296static void sppp_ipcp_tls(struct sppp *sp); 297static void sppp_ipcp_tlf(struct sppp *sp); 298static void sppp_ipcp_scr(struct sppp *sp); 299 300static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 301static void sppp_pap_init(struct sppp *sp); 302static void sppp_pap_open(struct sppp *sp); 303static void sppp_pap_close(struct sppp *sp); 304static void sppp_pap_TO(void *sp); 305static void sppp_pap_my_TO(void *sp); 306static void sppp_pap_tlu(struct sppp *sp); 307static void sppp_pap_tld(struct sppp *sp); 308static void sppp_pap_scr(struct sppp *sp); 309 310static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 311static void sppp_chap_init(struct sppp *sp); 312static void sppp_chap_open(struct sppp *sp); 313static void sppp_chap_close(struct sppp *sp); 314static void sppp_chap_TO(void *sp); 315static void sppp_chap_tlu(struct sppp *sp); 316static void sppp_chap_tld(struct sppp *sp); 317static void sppp_chap_scr(struct sppp *sp); 318 319static const char *sppp_auth_type_name(u_short proto, u_char type); 320static const char *sppp_cp_type_name(u_char type); 321static const char *sppp_dotted_quad(u_long addr); 322static const char *sppp_ipcp_opt_name(u_char opt); 323static const char *sppp_lcp_opt_name(u_char opt); 324static const char *sppp_phase_name(enum ppp_phase phase); 325static const char *sppp_proto_name(u_short proto); 326static const char *sppp_state_name(int state); 327static int sppp_params(struct sppp *sp, u_long cmd, void *data); 328static int sppp_strnlen(u_char *p, int max); 329static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, 330 u_long *srcmask); 331static void sppp_keepalive(void *dummy); 332static void sppp_phase_network(struct sppp *sp); 333static void sppp_print_bytes(const u_char *p, u_short len); 334static void sppp_print_string(const char *p, u_short len); 335static void sppp_qflush(struct ifqueue *ifq); 336static void sppp_set_ip_addr(struct sppp *sp, u_long src); 337 338/* our control protocol descriptors */ 339static const struct cp lcp = { 340 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 341 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 342 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 343 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 344 sppp_lcp_scr 345}; 346 347static const struct cp ipcp = { 348 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 349 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 350 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 351 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 352 sppp_ipcp_scr 353}; 354 355static const struct cp pap = { 356 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 357 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 358 sppp_pap_TO, 0, 0, 0, 359 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 360 sppp_pap_scr 361}; 362 363static const struct cp chap = { 364 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 365 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 366 sppp_chap_TO, 0, 0, 0, 367 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 368 sppp_chap_scr 369}; 370 371static const struct cp *cps[IDX_COUNT] = { 372 &lcp, /* IDX_LCP */ 373 &ipcp, /* IDX_IPCP */ 374 &pap, /* IDX_PAP */ 375 &chap, /* IDX_CHAP */ 376}; 377 378 379 /* 380 * Exported functions, comprising our interface to the lower layer. 381 */ 382 383/* 384 * Process the received packet. 385 */ 386void 387sppp_input(struct ifnet *ifp, struct mbuf *m) 388{ 389 struct ppp_header *h; 390 struct ifqueue *inq = 0; 391 int s; 392 struct sppp *sp = (struct sppp *)ifp; 393 int debug = ifp->if_flags & IFF_DEBUG; 394 395 if (ifp->if_flags & IFF_UP) 396 /* Count received bytes, add FCS and one flag */ 397 ifp->if_ibytes += m->m_pkthdr.len + 3; 398 399 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 400 /* Too small packet, drop it. */ 401 if (debug) 402 log(LOG_DEBUG, 403 "%s%d: input packet is too small, %d bytes\n", 404 ifp->if_name, ifp->if_unit, m->m_pkthdr.len); 405 drop: 406 ++ifp->if_ierrors; 407 ++ifp->if_iqdrops; 408 m_freem (m); 409 return; 410 } 411 412 /* Get PPP header. */ 413 h = mtod (m, struct ppp_header*); 414 m_adj (m, PPP_HEADER_LEN); 415 416 switch (h->address) { 417 case PPP_ALLSTATIONS: 418 if (h->control != PPP_UI) 419 goto invalid; 420 if (sp->pp_flags & PP_CISCO) { 421 if (debug) 422 log(LOG_DEBUG, 423 "%s%d: PPP packet in Cisco mode " 424 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 425 ifp->if_name, ifp->if_unit, 426 h->address, h->control, ntohs(h->protocol)); 427 goto drop; 428 } 429 switch (ntohs (h->protocol)) { 430 default: 431 if (sp->state[IDX_LCP] == STATE_OPENED) 432 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 433 ++sp->pp_seq, m->m_pkthdr.len + 2, 434 &h->protocol); 435 if (debug) 436 log(LOG_DEBUG, 437 "%s%d: invalid input protocol " 438 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 439 ifp->if_name, ifp->if_unit, 440 h->address, h->control, ntohs(h->protocol)); 441 ++ifp->if_noproto; 442 goto drop; 443 case PPP_LCP: 444 sppp_cp_input(&lcp, sp, m); 445 m_freem (m); 446 return; 447 case PPP_PAP: 448 if (sp->pp_phase >= PHASE_AUTHENTICATE) 449 sppp_pap_input(sp, m); 450 m_freem (m); 451 return; 452 case PPP_CHAP: 453 if (sp->pp_phase >= PHASE_AUTHENTICATE) 454 sppp_chap_input(sp, m); 455 m_freem (m); 456 return; 457#ifdef INET 458 case PPP_IPCP: 459 if (sp->pp_phase == PHASE_NETWORK) 460 sppp_cp_input(&ipcp, sp, m); 461 m_freem (m); 462 return; 463 case PPP_IP: 464 if (sp->state[IDX_IPCP] == STATE_OPENED) { 465 schednetisr (NETISR_IP); 466 inq = &ipintrq; 467 } 468 break; 469#endif 470#ifdef IPX 471 case PPP_IPX: 472 /* IPX IPXCP not implemented yet */ 473 if (sp->pp_phase == PHASE_NETWORK) { 474 schednetisr (NETISR_IPX); 475 inq = &ipxintrq; 476 } 477 break; 478#endif 479#ifdef NS 480 case PPP_XNS: 481 /* XNS IDPCP not implemented yet */ 482 if (sp->pp_phase == PHASE_NETWORK) { 483 schednetisr (NETISR_NS); 484 inq = &nsintrq; 485 } 486 break; 487#endif 488#ifdef ISO 489 case PPP_ISO: 490 /* OSI NLCP not implemented yet */ 491 if (sp->pp_phase == PHASE_NETWORK) { 492 schednetisr (NETISR_ISO); 493 inq = &clnlintrq; 494 } 495 break; 496#endif 497 } 498 break; 499 case CISCO_MULTICAST: 500 case CISCO_UNICAST: 501 /* Don't check the control field here (RFC 1547). */ 502 if (! (sp->pp_flags & PP_CISCO)) { 503 if (debug) 504 log(LOG_DEBUG, 505 "%s%d: Cisco packet in PPP mode " 506 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 507 ifp->if_name, ifp->if_unit, 508 h->address, h->control, ntohs(h->protocol)); 509 goto drop; 510 } 511 switch (ntohs (h->protocol)) { 512 default: 513 ++ifp->if_noproto; 514 goto invalid; 515 case CISCO_KEEPALIVE: 516 sppp_cisco_input ((struct sppp*) ifp, m); 517 m_freem (m); 518 return; 519#ifdef INET 520 case ETHERTYPE_IP: 521 schednetisr (NETISR_IP); 522 inq = &ipintrq; 523 break; 524#endif 525#ifdef IPX 526 case ETHERTYPE_IPX: 527 schednetisr (NETISR_IPX); 528 inq = &ipxintrq; 529 break; 530#endif 531#ifdef NS 532 case ETHERTYPE_NS: 533 schednetisr (NETISR_NS); 534 inq = &nsintrq; 535 break; 536#endif 537 } 538 break; 539 default: /* Invalid PPP packet. */ 540 invalid: 541 if (debug) 542 log(LOG_DEBUG, 543 "%s%d: invalid input packet " 544 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 545 ifp->if_name, ifp->if_unit, 546 h->address, h->control, ntohs(h->protocol)); 547 goto drop; 548 } 549 550 if (! (ifp->if_flags & IFF_UP) || ! inq) 551 goto drop; 552 553 /* Check queue. */ 554 s = splimp(); 555 if (IF_QFULL (inq)) { 556 /* Queue overflow. */ 557 IF_DROP(inq); 558 splx(s); 559 if (debug) 560 log(LOG_DEBUG, "%s%d: protocol queue overflow\n", 561 ifp->if_name, ifp->if_unit); 562 goto drop; 563 } 564 IF_ENQUEUE(inq, m); 565 splx(s); 566} 567 568/* 569 * Enqueue transmit packet. 570 */ 571static int 572sppp_output(struct ifnet *ifp, struct mbuf *m, 573 struct sockaddr *dst, struct rtentry *rt) 574{ 575 struct sppp *sp = (struct sppp*) ifp; 576 struct ppp_header *h; 577 struct ifqueue *ifq; 578 int s, rv = 0; 579 580 s = splimp(); 581 582 if ((ifp->if_flags & IFF_UP) == 0 || 583 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 584 m_freem (m); 585 splx (s); 586 return (ENETDOWN); 587 } 588 589 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 590 /* 591 * Interface is not yet running, but auto-dial. Need 592 * to start LCP for it. 593 */ 594 ifp->if_flags |= IFF_RUNNING; 595 splx(s); 596 lcp.Open(sp); 597 s = splimp(); 598 } 599 600 ifq = &ifp->if_snd; 601#ifdef INET 602 /* 603 * Put low delay, telnet, rlogin and ftp control packets 604 * in front of the queue. 605 */ 606 if (dst->sa_family == AF_INET) { 607 struct ip *ip = mtod (m, struct ip*); 608 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 609 610 if (! IF_QFULL (&sp->pp_fastq) && 611 ((ip->ip_tos & IPTOS_LOWDELAY) || 612 ip->ip_p == IPPROTO_TCP && 613 m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) && 614 (INTERACTIVE (ntohs (tcp->th_sport)) || 615 INTERACTIVE (ntohs (tcp->th_dport))))) 616 ifq = &sp->pp_fastq; 617 } 618#endif 619 620 /* 621 * Prepend general data packet PPP header. For now, IP only. 622 */ 623 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 624 if (! m) { 625 if (ifp->if_flags & IFF_DEBUG) 626 log(LOG_DEBUG, "%s%d: no memory for transmit header\n", 627 ifp->if_name, ifp->if_unit); 628 ++ifp->if_oerrors; 629 splx (s); 630 return (ENOBUFS); 631 } 632 h = mtod (m, struct ppp_header*); 633 if (sp->pp_flags & PP_CISCO) { 634 h->address = CISCO_UNICAST; /* unicast address */ 635 h->control = 0; 636 } else { 637 h->address = PPP_ALLSTATIONS; /* broadcast address */ 638 h->control = PPP_UI; /* Unnumbered Info */ 639 } 640 641 switch (dst->sa_family) { 642#ifdef INET 643 case AF_INET: /* Internet Protocol */ 644 if (sp->pp_flags & PP_CISCO) 645 h->protocol = htons (ETHERTYPE_IP); 646 else { 647 /* 648 * Don't choke with an ENETDOWN early. It's 649 * possible that we just started dialing out, 650 * so don't drop the packet immediately. If 651 * we notice that we run out of buffer space 652 * below, we will however remember that we are 653 * not ready to carry IP packets, and return 654 * ENETDOWN, as opposed to ENOBUFS. 655 */ 656 h->protocol = htons(PPP_IP); 657 if (sp->state[IDX_IPCP] != STATE_OPENED) 658 rv = ENETDOWN; 659 } 660 break; 661#endif 662#ifdef NS 663 case AF_NS: /* Xerox NS Protocol */ 664 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 665 ETHERTYPE_NS : PPP_XNS); 666 break; 667#endif 668#ifdef IPX 669 case AF_IPX: /* Novell IPX Protocol */ 670 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 671 ETHERTYPE_IPX : PPP_IPX); 672 break; 673#endif 674#ifdef ISO 675 case AF_ISO: /* ISO OSI Protocol */ 676 if (sp->pp_flags & PP_CISCO) 677 goto nosupport; 678 h->protocol = htons (PPP_ISO); 679 break; 680nosupport: 681#endif 682 default: 683 m_freem (m); 684 ++ifp->if_oerrors; 685 splx (s); 686 return (EAFNOSUPPORT); 687 } 688 689 /* 690 * Queue message on interface, and start output if interface 691 * not yet active. 692 */ 693 if (IF_QFULL (ifq)) { 694 IF_DROP (&ifp->if_snd); 695 m_freem (m); 696 ++ifp->if_oerrors; 697 splx (s); 698 return (rv? rv: ENOBUFS); 699 } 700 IF_ENQUEUE (ifq, m); 701 if (! (ifp->if_flags & IFF_OACTIVE)) 702 (*ifp->if_start) (ifp); 703 704 /* 705 * Count output packets and bytes. 706 * The packet length includes header, FCS and 1 flag, 707 * according to RFC 1333. 708 */ 709 ifp->if_obytes += m->m_pkthdr.len + 3; 710 splx (s); 711 return (0); 712} 713 714void 715sppp_attach(struct ifnet *ifp) 716{ 717 struct sppp *sp = (struct sppp*) ifp; 718 719 /* Initialize keepalive handler. */ 720 if (! spppq) 721 keepalive_ch = timeout(sppp_keepalive, 0, hz * 10); 722 723 /* Insert new entry into the keepalive list. */ 724 sp->pp_next = spppq; 725 spppq = sp; 726 727 sp->pp_if.if_type = IFT_PPP; 728 sp->pp_if.if_output = sppp_output; 729 sp->pp_fastq.ifq_maxlen = 32; 730 sp->pp_cpq.ifq_maxlen = 20; 731 sp->pp_loopcnt = 0; 732 sp->pp_alivecnt = 0; 733 sp->pp_seq = 0; 734 sp->pp_rseq = 0; 735 sp->pp_phase = PHASE_DEAD; 736 sp->pp_up = lcp.Up; 737 sp->pp_down = lcp.Down; 738 739 sppp_lcp_init(sp); 740 sppp_ipcp_init(sp); 741 sppp_pap_init(sp); 742 sppp_chap_init(sp); 743} 744 745void 746sppp_detach(struct ifnet *ifp) 747{ 748 struct sppp **q, *p, *sp = (struct sppp*) ifp; 749 int i; 750 751 /* Remove the entry from the keepalive list. */ 752 for (q = &spppq; (p = *q); q = &p->pp_next) 753 if (p == sp) { 754 *q = p->pp_next; 755 break; 756 } 757 758 /* Stop keepalive handler. */ 759 if (! spppq) 760 untimeout(sppp_keepalive, 0, keepalive_ch); 761 762 for (i = 0; i < IDX_COUNT; i++) 763 untimeout((cps[i])->TO, (void *)sp, sp->ch[i]); 764 untimeout(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 765} 766 767/* 768 * Flush the interface output queue. 769 */ 770void 771sppp_flush(struct ifnet *ifp) 772{ 773 struct sppp *sp = (struct sppp*) ifp; 774 775 sppp_qflush (&sp->pp_if.if_snd); 776 sppp_qflush (&sp->pp_fastq); 777 sppp_qflush (&sp->pp_cpq); 778} 779 780/* 781 * Check if the output queue is empty. 782 */ 783int 784sppp_isempty(struct ifnet *ifp) 785{ 786 struct sppp *sp = (struct sppp*) ifp; 787 int empty, s; 788 789 s = splimp(); 790 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 791 !sp->pp_if.if_snd.ifq_head; 792 splx(s); 793 return (empty); 794} 795 796/* 797 * Get next packet to send. 798 */ 799struct mbuf * 800sppp_dequeue(struct ifnet *ifp) 801{ 802 struct sppp *sp = (struct sppp*) ifp; 803 struct mbuf *m; 804 int s; 805 806 s = splimp(); 807 /* 808 * Process only the control protocol queue until we have at 809 * least one NCP open. 810 * 811 * Do always serve all three queues in Cisco mode. 812 */ 813 IF_DEQUEUE(&sp->pp_cpq, m); 814 if (m == NULL && 815 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 816 IF_DEQUEUE(&sp->pp_fastq, m); 817 if (m == NULL) 818 IF_DEQUEUE (&sp->pp_if.if_snd, m); 819 } 820 splx(s); 821 return m; 822} 823 824/* 825 * Pick the next packet, do not remove it from the queue. 826 */ 827struct mbuf * 828sppp_pick(struct ifnet *ifp) 829{ 830 struct sppp *sp = (struct sppp*)ifp; 831 struct mbuf *m; 832 int s; 833 834 s= splimp (); 835 836 m = sp->pp_cpq.ifq_head; 837 if (m == NULL && 838 (sp->pp_phase == PHASE_NETWORK || 839 (sp->pp_flags & PP_CISCO) != 0)) 840 if ((m = sp->pp_fastq.ifq_head) == NULL) 841 m = sp->pp_if.if_snd.ifq_head; 842 splx (s); 843 return (m); 844} 845 846/* 847 * Process an ioctl request. Called on low priority level. 848 */ 849int 850sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 851{ 852 struct ifreq *ifr = (struct ifreq*) data; 853 struct sppp *sp = (struct sppp*) ifp; 854 int s, rv, going_up, going_down, newmode; 855 856 s = splimp(); 857 rv = 0; 858 switch (cmd) { 859 case SIOCAIFADDR: 860 case SIOCSIFDSTADDR: 861 break; 862 863 case SIOCSIFADDR: 864 if_up(ifp); 865 /* fall through... */ 866 867 case SIOCSIFFLAGS: 868 going_up = ifp->if_flags & IFF_UP && 869 (ifp->if_flags & IFF_RUNNING) == 0; 870 going_down = (ifp->if_flags & IFF_UP) == 0 && 871 ifp->if_flags & IFF_RUNNING; 872 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 873 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 874 /* sanity */ 875 newmode = IFF_PASSIVE; 876 ifp->if_flags &= ~IFF_AUTO; 877 } 878 879 if (going_up || going_down) 880 lcp.Close(sp); 881 if (going_up && newmode == 0) { 882 /* neither auto-dial nor passive */ 883 ifp->if_flags |= IFF_RUNNING; 884 if (!(sp->pp_flags & PP_CISCO)) 885 lcp.Open(sp); 886 } else if (going_down) { 887 sppp_flush(ifp); 888 ifp->if_flags &= ~IFF_RUNNING; 889 } 890 891 break; 892 893#ifdef SIOCSIFMTU 894#ifndef ifr_mtu 895#define ifr_mtu ifr_metric 896#endif 897 case SIOCSIFMTU: 898 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 899 return (EINVAL); 900 ifp->if_mtu = ifr->ifr_mtu; 901 break; 902#endif 903#ifdef SLIOCSETMTU 904 case SLIOCSETMTU: 905 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 906 return (EINVAL); 907 ifp->if_mtu = *(short*)data; 908 break; 909#endif 910#ifdef SIOCGIFMTU 911 case SIOCGIFMTU: 912 ifr->ifr_mtu = ifp->if_mtu; 913 break; 914#endif 915#ifdef SLIOCGETMTU 916 case SLIOCGETMTU: 917 *(short*)data = ifp->if_mtu; 918 break; 919#endif 920 case SIOCADDMULTI: 921 case SIOCDELMULTI: 922 break; 923 924 case SIOCGIFGENERIC: 925 case SIOCSIFGENERIC: 926 rv = sppp_params(sp, cmd, data); 927 break; 928 929 default: 930 rv = ENOTTY; 931 } 932 splx(s); 933 return rv; 934} 935 936 937 /* 938 * Cisco framing implementation. 939 */ 940 941/* 942 * Handle incoming Cisco keepalive protocol packets. 943 */ 944static void 945sppp_cisco_input(struct sppp *sp, struct mbuf *m) 946{ 947 STDDCL; 948 struct cisco_packet *h; 949 u_long me, mymask; 950 951 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 952 if (debug) 953 log(LOG_DEBUG, 954 "%s%d: cisco invalid packet length: %d bytes\n", 955 ifp->if_name, ifp->if_unit, m->m_pkthdr.len); 956 return; 957 } 958 h = mtod (m, struct cisco_packet*); 959 if (debug) 960 log(LOG_DEBUG, 961 "%s%d: cisco input: %d bytes " 962 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 963 ifp->if_name, ifp->if_unit, m->m_pkthdr.len, 964 ntohl (h->type), h->par1, h->par2, h->rel, 965 h->time0, h->time1); 966 switch (ntohl (h->type)) { 967 default: 968 if (debug) 969 addlog("%s%d: cisco unknown packet type: 0x%lx\n", 970 ifp->if_name, ifp->if_unit, ntohl (h->type)); 971 break; 972 case CISCO_ADDR_REPLY: 973 /* Reply on address request, ignore */ 974 break; 975 case CISCO_KEEPALIVE_REQ: 976 sp->pp_alivecnt = 0; 977 sp->pp_rseq = ntohl (h->par1); 978 if (sp->pp_seq == sp->pp_rseq) { 979 /* Local and remote sequence numbers are equal. 980 * Probably, the line is in loopback mode. */ 981 if (sp->pp_loopcnt >= MAXALIVECNT) { 982 printf ("%s%d: loopback\n", 983 ifp->if_name, ifp->if_unit); 984 sp->pp_loopcnt = 0; 985 if (ifp->if_flags & IFF_UP) { 986 if_down (ifp); 987 sppp_qflush (&sp->pp_cpq); 988 } 989 } 990 ++sp->pp_loopcnt; 991 992 /* Generate new local sequence number */ 993 sp->pp_seq = random(); 994 break; 995 } 996 sp->pp_loopcnt = 0; 997 if (! (ifp->if_flags & IFF_UP) && 998 (ifp->if_flags & IFF_RUNNING)) { 999 if_up(ifp); 1000 printf ("%s%d: up\n", ifp->if_name, ifp->if_unit); 1001 } 1002 break; 1003 case CISCO_ADDR_REQ: 1004 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1005 if (me != 0L) 1006 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1007 break; 1008 } 1009} 1010 1011/* 1012 * Send Cisco keepalive packet. 1013 */ 1014static void 1015sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 1016{ 1017 STDDCL; 1018 struct ppp_header *h; 1019 struct cisco_packet *ch; 1020 struct mbuf *m; 1021 struct timeval tv; 1022 1023 getmicrouptime(&tv); 1024 1025 MGETHDR (m, M_DONTWAIT, MT_DATA); 1026 if (! m) 1027 return; 1028 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1029 m->m_pkthdr.rcvif = 0; 1030 1031 h = mtod (m, struct ppp_header*); 1032 h->address = CISCO_MULTICAST; 1033 h->control = 0; 1034 h->protocol = htons (CISCO_KEEPALIVE); 1035 1036 ch = (struct cisco_packet*) (h + 1); 1037 ch->type = htonl (type); 1038 ch->par1 = htonl (par1); 1039 ch->par2 = htonl (par2); 1040 ch->rel = -1; 1041 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1042 ch->time1 = htons ((u_short) tv.tv_sec); 1043 1044 if (debug) 1045 log(LOG_DEBUG, 1046 "%s%d: cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1047 ifp->if_name, ifp->if_unit, ntohl (ch->type), ch->par1, 1048 ch->par2, ch->rel, ch->time0, ch->time1); 1049 1050 if (IF_QFULL (&sp->pp_cpq)) { 1051 IF_DROP (&sp->pp_fastq); 1052 IF_DROP (&ifp->if_snd); 1053 m_freem (m); 1054 } else 1055 IF_ENQUEUE (&sp->pp_cpq, m); 1056 if (! (ifp->if_flags & IFF_OACTIVE)) 1057 (*ifp->if_start) (ifp); 1058 ifp->if_obytes += m->m_pkthdr.len + 3; 1059} 1060 1061 /* 1062 * PPP protocol implementation. 1063 */ 1064 1065/* 1066 * Send PPP control protocol packet. 1067 */ 1068static void 1069sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1070 u_char ident, u_short len, void *data) 1071{ 1072 STDDCL; 1073 struct ppp_header *h; 1074 struct lcp_header *lh; 1075 struct mbuf *m; 1076 1077 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 1078 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 1079 MGETHDR (m, M_DONTWAIT, MT_DATA); 1080 if (! m) 1081 return; 1082 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 1083 m->m_pkthdr.rcvif = 0; 1084 1085 h = mtod (m, struct ppp_header*); 1086 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1087 h->control = PPP_UI; /* Unnumbered Info */ 1088 h->protocol = htons (proto); /* Link Control Protocol */ 1089 1090 lh = (struct lcp_header*) (h + 1); 1091 lh->type = type; 1092 lh->ident = ident; 1093 lh->len = htons (LCP_HEADER_LEN + len); 1094 if (len) 1095 bcopy (data, lh+1, len); 1096 1097 if (debug) { 1098 log(LOG_DEBUG, "%s%d: %s output <%s id=0x%x len=%d", 1099 ifp->if_name, ifp->if_unit, 1100 sppp_proto_name(proto), 1101 sppp_cp_type_name (lh->type), lh->ident, 1102 ntohs (lh->len)); 1103 if (len) 1104 sppp_print_bytes ((u_char*) (lh+1), len); 1105 addlog(">\n"); 1106 } 1107 if (IF_QFULL (&sp->pp_cpq)) { 1108 IF_DROP (&sp->pp_fastq); 1109 IF_DROP (&ifp->if_snd); 1110 m_freem (m); 1111 ++ifp->if_oerrors; 1112 } else 1113 IF_ENQUEUE (&sp->pp_cpq, m); 1114 if (! (ifp->if_flags & IFF_OACTIVE)) 1115 (*ifp->if_start) (ifp); 1116 ifp->if_obytes += m->m_pkthdr.len + 3; 1117} 1118 1119/* 1120 * Handle incoming PPP control protocol packets. 1121 */ 1122static void 1123sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1124{ 1125 STDDCL; 1126 struct lcp_header *h; 1127 int len = m->m_pkthdr.len; 1128 int rv; 1129 u_char *p; 1130 1131 if (len < 4) { 1132 if (debug) 1133 log(LOG_DEBUG, 1134 "%s%d: %s invalid packet length: %d bytes\n", 1135 ifp->if_name, ifp->if_unit, cp->name, len); 1136 return; 1137 } 1138 h = mtod (m, struct lcp_header*); 1139 if (debug) { 1140 log(LOG_DEBUG, 1141 "%s%d: %s input(%s): <%s id=0x%x len=%d", 1142 ifp->if_name, ifp->if_unit, cp->name, 1143 sppp_state_name(sp->state[cp->protoidx]), 1144 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1145 if (len > 4) 1146 sppp_print_bytes ((u_char*) (h+1), len-4); 1147 addlog(">\n"); 1148 } 1149 if (len > ntohs (h->len)) 1150 len = ntohs (h->len); 1151 p = (u_char *)(h + 1); 1152 switch (h->type) { 1153 case CONF_REQ: 1154 if (len < 4) { 1155 if (debug) 1156 addlog("%s%d: %s invalid conf-req length %d\n", 1157 ifp->if_name, ifp->if_unit, cp->name, 1158 len); 1159 ++ifp->if_ierrors; 1160 break; 1161 } 1162 /* handle states where RCR doesn't get a SCA/SCN */ 1163 switch (sp->state[cp->protoidx]) { 1164 case STATE_CLOSING: 1165 case STATE_STOPPING: 1166 return; 1167 case STATE_CLOSED: 1168 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1169 0, 0); 1170 return; 1171 } 1172 rv = (cp->RCR)(sp, h, len); 1173 switch (sp->state[cp->protoidx]) { 1174 case STATE_OPENED: 1175 (cp->tld)(sp); 1176 (cp->scr)(sp); 1177 /* fall through... */ 1178 case STATE_ACK_SENT: 1179 case STATE_REQ_SENT: 1180 sppp_cp_change_state(cp, sp, rv? 1181 STATE_ACK_SENT: STATE_REQ_SENT); 1182 break; 1183 case STATE_STOPPED: 1184 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1185 (cp->scr)(sp); 1186 sppp_cp_change_state(cp, sp, rv? 1187 STATE_ACK_SENT: STATE_REQ_SENT); 1188 break; 1189 case STATE_ACK_RCVD: 1190 if (rv) { 1191 sppp_cp_change_state(cp, sp, STATE_OPENED); 1192 if (debug) 1193 log(LOG_DEBUG, "%s%d: %s tlu\n", 1194 ifp->if_name, ifp->if_unit, 1195 cp->name); 1196 (cp->tlu)(sp); 1197 } else 1198 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1199 break; 1200 default: 1201 printf("%s%d: %s illegal %s in state %s\n", 1202 ifp->if_name, ifp->if_unit, cp->name, 1203 sppp_cp_type_name(h->type), 1204 sppp_state_name(sp->state[cp->protoidx])); 1205 ++ifp->if_ierrors; 1206 } 1207 break; 1208 case CONF_ACK: 1209 if (h->ident != sp->confid[cp->protoidx]) { 1210 if (debug) 1211 addlog("%s%d: %s id mismatch 0x%x != 0x%x\n", 1212 ifp->if_name, ifp->if_unit, cp->name, 1213 h->ident, sp->confid[cp->protoidx]); 1214 ++ifp->if_ierrors; 1215 break; 1216 } 1217 switch (sp->state[cp->protoidx]) { 1218 case STATE_CLOSED: 1219 case STATE_STOPPED: 1220 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1221 break; 1222 case STATE_CLOSING: 1223 case STATE_STOPPING: 1224 break; 1225 case STATE_REQ_SENT: 1226 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1227 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1228 break; 1229 case STATE_OPENED: 1230 (cp->tld)(sp); 1231 /* fall through */ 1232 case STATE_ACK_RCVD: 1233 (cp->scr)(sp); 1234 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1235 break; 1236 case STATE_ACK_SENT: 1237 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1238 sppp_cp_change_state(cp, sp, STATE_OPENED); 1239 if (debug) 1240 log(LOG_DEBUG, "%s%d: %s tlu\n", 1241 ifp->if_name, ifp->if_unit, cp->name); 1242 (cp->tlu)(sp); 1243 break; 1244 default: 1245 printf("%s%d: %s illegal %s in state %s\n", 1246 ifp->if_name, ifp->if_unit, cp->name, 1247 sppp_cp_type_name(h->type), 1248 sppp_state_name(sp->state[cp->protoidx])); 1249 ++ifp->if_ierrors; 1250 } 1251 break; 1252 case CONF_NAK: 1253 case CONF_REJ: 1254 if (h->ident != sp->confid[cp->protoidx]) { 1255 if (debug) 1256 addlog("%s%d: %s id mismatch 0x%x != 0x%x\n", 1257 ifp->if_name, ifp->if_unit, cp->name, 1258 h->ident, sp->confid[cp->protoidx]); 1259 ++ifp->if_ierrors; 1260 break; 1261 } 1262 if (h->type == CONF_NAK) 1263 (cp->RCN_nak)(sp, h, len); 1264 else /* CONF_REJ */ 1265 (cp->RCN_rej)(sp, h, len); 1266 1267 switch (sp->state[cp->protoidx]) { 1268 case STATE_CLOSED: 1269 case STATE_STOPPED: 1270 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1271 break; 1272 case STATE_REQ_SENT: 1273 case STATE_ACK_SENT: 1274 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1275 (cp->scr)(sp); 1276 break; 1277 case STATE_OPENED: 1278 (cp->tld)(sp); 1279 /* fall through */ 1280 case STATE_ACK_RCVD: 1281 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1282 (cp->scr)(sp); 1283 break; 1284 case STATE_CLOSING: 1285 case STATE_STOPPING: 1286 break; 1287 default: 1288 printf("%s%d: %s illegal %s in state %s\n", 1289 ifp->if_name, ifp->if_unit, cp->name, 1290 sppp_cp_type_name(h->type), 1291 sppp_state_name(sp->state[cp->protoidx])); 1292 ++ifp->if_ierrors; 1293 } 1294 break; 1295 1296 case TERM_REQ: 1297 switch (sp->state[cp->protoidx]) { 1298 case STATE_ACK_RCVD: 1299 case STATE_ACK_SENT: 1300 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1301 /* fall through */ 1302 case STATE_CLOSED: 1303 case STATE_STOPPED: 1304 case STATE_CLOSING: 1305 case STATE_STOPPING: 1306 case STATE_REQ_SENT: 1307 sta: 1308 /* Send Terminate-Ack packet. */ 1309 if (debug) 1310 log(LOG_DEBUG, "%s%d: %s send terminate-ack\n", 1311 ifp->if_name, ifp->if_unit, cp->name); 1312 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1313 break; 1314 case STATE_OPENED: 1315 (cp->tld)(sp); 1316 sp->rst_counter[cp->protoidx] = 0; 1317 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1318 goto sta; 1319 break; 1320 default: 1321 printf("%s%d: %s illegal %s in state %s\n", 1322 ifp->if_name, ifp->if_unit, cp->name, 1323 sppp_cp_type_name(h->type), 1324 sppp_state_name(sp->state[cp->protoidx])); 1325 ++ifp->if_ierrors; 1326 } 1327 break; 1328 case TERM_ACK: 1329 switch (sp->state[cp->protoidx]) { 1330 case STATE_CLOSED: 1331 case STATE_STOPPED: 1332 case STATE_REQ_SENT: 1333 case STATE_ACK_SENT: 1334 break; 1335 case STATE_CLOSING: 1336 (cp->tlf)(sp); 1337 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1338 break; 1339 case STATE_STOPPING: 1340 (cp->tlf)(sp); 1341 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1342 break; 1343 case STATE_ACK_RCVD: 1344 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1345 break; 1346 case STATE_OPENED: 1347 (cp->tld)(sp); 1348 (cp->scr)(sp); 1349 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1350 break; 1351 default: 1352 printf("%s%d: %s illegal %s in state %s\n", 1353 ifp->if_name, ifp->if_unit, cp->name, 1354 sppp_cp_type_name(h->type), 1355 sppp_state_name(sp->state[cp->protoidx])); 1356 ++ifp->if_ierrors; 1357 } 1358 break; 1359 case CODE_REJ: 1360 case PROTO_REJ: 1361 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1362 log(LOG_INFO, 1363 "%s%d: %s: ignoring RXJ (%s) for proto 0x%x, " 1364 "danger will robinson\n", 1365 ifp->if_name, ifp->if_unit, cp->name, 1366 sppp_cp_type_name(h->type), ntohs(*((u_short *)p))); 1367 switch (sp->state[cp->protoidx]) { 1368 case STATE_CLOSED: 1369 case STATE_STOPPED: 1370 case STATE_REQ_SENT: 1371 case STATE_ACK_SENT: 1372 case STATE_CLOSING: 1373 case STATE_STOPPING: 1374 case STATE_OPENED: 1375 break; 1376 case STATE_ACK_RCVD: 1377 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1378 break; 1379 default: 1380 printf("%s%d: %s illegal %s in state %s\n", 1381 ifp->if_name, ifp->if_unit, cp->name, 1382 sppp_cp_type_name(h->type), 1383 sppp_state_name(sp->state[cp->protoidx])); 1384 ++ifp->if_ierrors; 1385 } 1386 break; 1387 case DISC_REQ: 1388 if (cp->proto != PPP_LCP) 1389 goto illegal; 1390 /* Discard the packet. */ 1391 break; 1392 case ECHO_REQ: 1393 if (cp->proto != PPP_LCP) 1394 goto illegal; 1395 if (sp->state[cp->protoidx] != STATE_OPENED) { 1396 if (debug) 1397 addlog("%s%d: lcp echo req but lcp closed\n", 1398 ifp->if_name, ifp->if_unit); 1399 ++ifp->if_ierrors; 1400 break; 1401 } 1402 if (len < 8) { 1403 if (debug) 1404 addlog("%s%d: invalid lcp echo request " 1405 "packet length: %d bytes\n", 1406 ifp->if_name, ifp->if_unit, len); 1407 break; 1408 } 1409 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1410 /* Line loopback mode detected. */ 1411 printf("%s%d: loopback\n", ifp->if_name, ifp->if_unit); 1412 if_down (ifp); 1413 sppp_qflush (&sp->pp_cpq); 1414 1415 /* Shut down the PPP link. */ 1416 /* XXX */ 1417 lcp.Down(sp); 1418 lcp.Up(sp); 1419 break; 1420 } 1421 *(long*)(h+1) = htonl (sp->lcp.magic); 1422 if (debug) 1423 addlog("%s%d: got lcp echo req, sending echo rep\n", 1424 ifp->if_name, ifp->if_unit); 1425 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1426 break; 1427 case ECHO_REPLY: 1428 if (cp->proto != PPP_LCP) 1429 goto illegal; 1430 if (h->ident != sp->lcp.echoid) { 1431 ++ifp->if_ierrors; 1432 break; 1433 } 1434 if (len < 8) { 1435 if (debug) 1436 addlog("%s%d: lcp invalid echo reply " 1437 "packet length: %d bytes\n", 1438 ifp->if_name, ifp->if_unit, len); 1439 break; 1440 } 1441 if (debug) 1442 addlog("%s%d: lcp got echo rep\n", 1443 ifp->if_name, ifp->if_unit); 1444 if (ntohl (*(long*)(h+1)) != sp->lcp.magic) 1445 sp->pp_alivecnt = 0; 1446 break; 1447 default: 1448 /* Unknown packet type -- send Code-Reject packet. */ 1449 illegal: 1450 if (debug) 1451 addlog("%s%d: %s send code-rej for 0x%x\n", 1452 ifp->if_name, ifp->if_unit, cp->name, h->type); 1453 sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq, 1454 m->m_pkthdr.len, h); 1455 ++ifp->if_ierrors; 1456 } 1457} 1458 1459 1460/* 1461 * The generic part of all Up/Down/Open/Close/TO event handlers. 1462 * Basically, the state transition handling in the automaton. 1463 */ 1464static void 1465sppp_up_event(const struct cp *cp, struct sppp *sp) 1466{ 1467 STDDCL; 1468 1469 if (debug) 1470 log(LOG_DEBUG, "%s%d: %s up(%s)\n", 1471 ifp->if_name, ifp->if_unit, cp->name, 1472 sppp_state_name(sp->state[cp->protoidx])); 1473 1474 switch (sp->state[cp->protoidx]) { 1475 case STATE_INITIAL: 1476 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1477 break; 1478 case STATE_STARTING: 1479 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1480 (cp->scr)(sp); 1481 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1482 break; 1483 default: 1484 printf("%s%d: %s illegal up in state %s\n", 1485 ifp->if_name, ifp->if_unit, cp->name, 1486 sppp_state_name(sp->state[cp->protoidx])); 1487 } 1488} 1489 1490static void 1491sppp_down_event(const struct cp *cp, struct sppp *sp) 1492{ 1493 STDDCL; 1494 1495 if (debug) 1496 log(LOG_DEBUG, "%s%d: %s down(%s)\n", 1497 ifp->if_name, ifp->if_unit, cp->name, 1498 sppp_state_name(sp->state[cp->protoidx])); 1499 1500 switch (sp->state[cp->protoidx]) { 1501 case STATE_CLOSED: 1502 case STATE_CLOSING: 1503 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1504 break; 1505 case STATE_STOPPED: 1506 (cp->tls)(sp); 1507 /* fall through */ 1508 case STATE_STOPPING: 1509 case STATE_REQ_SENT: 1510 case STATE_ACK_RCVD: 1511 case STATE_ACK_SENT: 1512 sppp_cp_change_state(cp, sp, STATE_STARTING); 1513 break; 1514 case STATE_OPENED: 1515 (cp->tld)(sp); 1516 sppp_cp_change_state(cp, sp, STATE_STARTING); 1517 break; 1518 default: 1519 printf("%s%d: %s illegal down in state %s\n", 1520 ifp->if_name, ifp->if_unit, cp->name, 1521 sppp_state_name(sp->state[cp->protoidx])); 1522 } 1523} 1524 1525 1526static void 1527sppp_open_event(const struct cp *cp, struct sppp *sp) 1528{ 1529 STDDCL; 1530 1531 if (debug) 1532 log(LOG_DEBUG, "%s%d: %s open(%s)\n", 1533 ifp->if_name, ifp->if_unit, cp->name, 1534 sppp_state_name(sp->state[cp->protoidx])); 1535 1536 switch (sp->state[cp->protoidx]) { 1537 case STATE_INITIAL: 1538 (cp->tls)(sp); 1539 sppp_cp_change_state(cp, sp, STATE_STARTING); 1540 break; 1541 case STATE_STARTING: 1542 break; 1543 case STATE_CLOSED: 1544 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1545 (cp->scr)(sp); 1546 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1547 break; 1548 case STATE_STOPPED: 1549 case STATE_STOPPING: 1550 case STATE_REQ_SENT: 1551 case STATE_ACK_RCVD: 1552 case STATE_ACK_SENT: 1553 case STATE_OPENED: 1554 break; 1555 case STATE_CLOSING: 1556 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1557 break; 1558 } 1559} 1560 1561 1562static void 1563sppp_close_event(const struct cp *cp, struct sppp *sp) 1564{ 1565 STDDCL; 1566 1567 if (debug) 1568 log(LOG_DEBUG, "%s%d: %s close(%s)\n", 1569 ifp->if_name, ifp->if_unit, cp->name, 1570 sppp_state_name(sp->state[cp->protoidx])); 1571 1572 switch (sp->state[cp->protoidx]) { 1573 case STATE_INITIAL: 1574 case STATE_CLOSED: 1575 case STATE_CLOSING: 1576 break; 1577 case STATE_STARTING: 1578 (cp->tlf)(sp); 1579 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1580 break; 1581 case STATE_STOPPED: 1582 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1583 break; 1584 case STATE_STOPPING: 1585 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1586 break; 1587 case STATE_OPENED: 1588 (cp->tld)(sp); 1589 /* fall through */ 1590 case STATE_REQ_SENT: 1591 case STATE_ACK_RCVD: 1592 case STATE_ACK_SENT: 1593 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1594 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0); 1595 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1596 break; 1597 } 1598} 1599 1600static void 1601sppp_to_event(const struct cp *cp, struct sppp *sp) 1602{ 1603 STDDCL; 1604 int s; 1605 1606 s = splimp(); 1607 if (debug) 1608 log(LOG_DEBUG, "%s%d: %s TO(%s) rst_counter = %d\n", 1609 ifp->if_name, ifp->if_unit, cp->name, 1610 sppp_state_name(sp->state[cp->protoidx]), 1611 sp->rst_counter[cp->protoidx]); 1612 1613 if (--sp->rst_counter[cp->protoidx] < 0) 1614 /* TO- event */ 1615 switch (sp->state[cp->protoidx]) { 1616 case STATE_CLOSING: 1617 (cp->tlf)(sp); 1618 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1619 break; 1620 case STATE_STOPPING: 1621 (cp->tlf)(sp); 1622 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1623 break; 1624 case STATE_REQ_SENT: 1625 case STATE_ACK_RCVD: 1626 case STATE_ACK_SENT: 1627 (cp->tlf)(sp); 1628 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1629 break; 1630 } 1631 else 1632 /* TO+ event */ 1633 switch (sp->state[cp->protoidx]) { 1634 case STATE_CLOSING: 1635 case STATE_STOPPING: 1636 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 1637 0, 0); 1638 sp->ch[cp->protoidx] = timeout(cp->TO, (void *)sp, 1639 sp->lcp.timeout); 1640 break; 1641 case STATE_REQ_SENT: 1642 case STATE_ACK_RCVD: 1643 (cp->scr)(sp); 1644 /* sppp_cp_change_state() will restart the timer */ 1645 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1646 break; 1647 case STATE_ACK_SENT: 1648 (cp->scr)(sp); 1649 sp->ch[cp->protoidx] = timeout(cp->TO, (void *)sp, 1650 sp->lcp.timeout); 1651 break; 1652 } 1653 1654 splx(s); 1655} 1656 1657/* 1658 * Change the state of a control protocol in the state automaton. 1659 * Takes care of starting/stopping the restart timer. 1660 */ 1661void 1662sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1663{ 1664 sp->state[cp->protoidx] = newstate; 1665 1666 untimeout(cp->TO, (void *)sp, sp->ch[cp->protoidx]); 1667 switch (newstate) { 1668 case STATE_INITIAL: 1669 case STATE_STARTING: 1670 case STATE_CLOSED: 1671 case STATE_STOPPED: 1672 case STATE_OPENED: 1673 break; 1674 case STATE_CLOSING: 1675 case STATE_STOPPING: 1676 case STATE_REQ_SENT: 1677 case STATE_ACK_RCVD: 1678 case STATE_ACK_SENT: 1679 sp->ch[cp->protoidx] = timeout(cp->TO, (void *)sp, 1680 sp->lcp.timeout); 1681 break; 1682 } 1683} 1684 /* 1685 *--------------------------------------------------------------------------* 1686 * * 1687 * The LCP implementation. * 1688 * * 1689 *--------------------------------------------------------------------------* 1690 */ 1691static void 1692sppp_lcp_init(struct sppp *sp) 1693{ 1694 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1695 sp->lcp.magic = 0; 1696 sp->state[IDX_LCP] = STATE_INITIAL; 1697 sp->fail_counter[IDX_LCP] = 0; 1698 sp->lcp.protos = 0; 1699 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1700 1701 /* 1702 * Initialize counters and timeout values. Note that we don't 1703 * use the 3 seconds suggested in RFC 1661 since we are likely 1704 * running on a fast link. XXX We should probably implement 1705 * the exponential backoff option. Note that these values are 1706 * relevant for all control protocols, not just LCP only. 1707 */ 1708 sp->lcp.timeout = 1 * hz; 1709 sp->lcp.max_terminate = 2; 1710 sp->lcp.max_configure = 10; 1711 sp->lcp.max_failure = 10; 1712 callout_handle_init(&sp->ch[IDX_LCP]); 1713} 1714 1715static void 1716sppp_lcp_up(struct sppp *sp) 1717{ 1718 STDDCL; 1719 1720 /* 1721 * If this interface is passive or dial-on-demand, and we are 1722 * still in Initial state, it means we've got an incoming 1723 * call. Activate the interface. 1724 */ 1725 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1726 if (debug) 1727 log(LOG_DEBUG, 1728 "%s%d: Up event", ifp->if_name, ifp->if_unit); 1729 ifp->if_flags |= IFF_RUNNING; 1730 if (sp->state[IDX_LCP] == STATE_INITIAL) { 1731 if (debug) 1732 addlog("(incoming call)\n"); 1733 sp->pp_flags |= PP_CALLIN; 1734 lcp.Open(sp); 1735 } else if (debug) 1736 addlog("\n"); 1737 } 1738 1739 sppp_up_event(&lcp, sp); 1740} 1741 1742static void 1743sppp_lcp_down(struct sppp *sp) 1744{ 1745 STDDCL; 1746 1747 sppp_down_event(&lcp, sp); 1748 1749 /* 1750 * If this is neither a dial-on-demand nor a passive 1751 * interface, simulate an ``ifconfig down'' action, so the 1752 * administrator can force a redial by another ``ifconfig 1753 * up''. XXX For leased line operation, should we immediately 1754 * try to reopen the connection here? 1755 */ 1756 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 1757 log(LOG_INFO, 1758 "%s%d: Down event (carrier loss), taking interface down.\n", 1759 ifp->if_name, ifp->if_unit); 1760 if_down(ifp); 1761 } else { 1762 if (debug) 1763 log(LOG_DEBUG, 1764 "%s%d: Down event (carrier loss)\n", 1765 ifp->if_name, ifp->if_unit); 1766 } 1767 sp->pp_flags &= ~PP_CALLIN; 1768 if (sp->state[IDX_LCP] != STATE_INITIAL) 1769 lcp.Close(sp); 1770 ifp->if_flags &= ~IFF_RUNNING; 1771} 1772 1773static void 1774sppp_lcp_open(struct sppp *sp) 1775{ 1776 /* 1777 * If we are authenticator, negotiate LCP_AUTH 1778 */ 1779 if (sp->hisauth.proto != 0) 1780 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 1781 else 1782 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 1783 sp->pp_flags &= ~PP_NEEDAUTH; 1784 sppp_open_event(&lcp, sp); 1785} 1786 1787static void 1788sppp_lcp_close(struct sppp *sp) 1789{ 1790 sppp_close_event(&lcp, sp); 1791} 1792 1793static void 1794sppp_lcp_TO(void *cookie) 1795{ 1796 sppp_to_event(&lcp, (struct sppp *)cookie); 1797} 1798 1799/* 1800 * Analyze a configure request. Return true if it was agreeable, and 1801 * caused action sca, false if it has been rejected or nak'ed, and 1802 * caused action scn. (The return value is used to make the state 1803 * transition decision in the state automaton.) 1804 */ 1805static int 1806sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 1807{ 1808 STDDCL; 1809 u_char *buf, *r, *p; 1810 int origlen, rlen; 1811 u_long nmagic; 1812 u_short authproto; 1813 1814 len -= 4; 1815 origlen = len; 1816 buf = r = malloc (len, M_TEMP, M_NOWAIT); 1817 if (! buf) 1818 return (0); 1819 1820 if (debug) 1821 log(LOG_DEBUG, "%s%d: lcp parse opts: ", 1822 ifp->if_name, ifp->if_unit); 1823 1824 /* pass 1: check for things that need to be rejected */ 1825 p = (void*) (h+1); 1826 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1827 if (debug) 1828 addlog(" %s ", sppp_lcp_opt_name(*p)); 1829 switch (*p) { 1830 case LCP_OPT_MAGIC: 1831 /* Magic number. */ 1832 /* fall through, both are same length */ 1833 case LCP_OPT_ASYNC_MAP: 1834 /* Async control character map. */ 1835 if (len >= 6 || p[1] == 6) 1836 continue; 1837 if (debug) 1838 addlog("[invalid] "); 1839 break; 1840 case LCP_OPT_MRU: 1841 /* Maximum receive unit. */ 1842 if (len >= 4 && p[1] == 4) 1843 continue; 1844 if (debug) 1845 addlog("[invalid] "); 1846 break; 1847 case LCP_OPT_AUTH_PROTO: 1848 if (len < 4) { 1849 if (debug) 1850 addlog("[invalid] "); 1851 break; 1852 } 1853 authproto = (p[2] << 8) + p[3]; 1854 if (authproto == PPP_CHAP && p[1] != 5) { 1855 if (debug) 1856 addlog("[invalid chap len] "); 1857 break; 1858 } 1859 if (sp->myauth.proto == 0) { 1860 /* we are not configured to do auth */ 1861 if (debug) 1862 addlog("[not configured] "); 1863 break; 1864 } 1865 /* 1866 * Remote want us to authenticate, remember this, 1867 * so we stay in PHASE_AUTHENTICATE after LCP got 1868 * up. 1869 */ 1870 sp->pp_flags |= PP_NEEDAUTH; 1871 continue; 1872 default: 1873 /* Others not supported. */ 1874 if (debug) 1875 addlog("[rej] "); 1876 break; 1877 } 1878 /* Add the option to rejected list. */ 1879 bcopy (p, r, p[1]); 1880 r += p[1]; 1881 rlen += p[1]; 1882 } 1883 if (rlen) { 1884 if (debug) 1885 addlog(" send conf-rej\n"); 1886 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 1887 return 0; 1888 } else if (debug) 1889 addlog("\n"); 1890 1891 /* 1892 * pass 2: check for option values that are unacceptable and 1893 * thus require to be nak'ed. 1894 */ 1895 if (debug) 1896 log(LOG_DEBUG, "%s%d: lcp parse opt values: ", 1897 ifp->if_name, ifp->if_unit); 1898 1899 p = (void*) (h+1); 1900 len = origlen; 1901 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1902 if (debug) 1903 addlog(" %s ", sppp_lcp_opt_name(*p)); 1904 switch (*p) { 1905 case LCP_OPT_MAGIC: 1906 /* Magic number -- extract. */ 1907 nmagic = (u_long)p[2] << 24 | 1908 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 1909 if (nmagic != sp->lcp.magic) { 1910 if (debug) 1911 addlog("0x%lx ", nmagic); 1912 continue; 1913 } 1914 /* 1915 * Local and remote magics equal -- loopback? 1916 */ 1917 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 1918 printf ("%s%d: loopback\n", 1919 ifp->if_name, ifp->if_unit); 1920 sp->pp_loopcnt = 0; 1921 if (ifp->if_flags & IFF_UP) { 1922 if_down(ifp); 1923 sppp_qflush(&sp->pp_cpq); 1924 /* XXX ? */ 1925 lcp.Down(sp); 1926 lcp.Up(sp); 1927 } 1928 } else if (debug) 1929 addlog("[glitch] "); 1930 ++sp->pp_loopcnt; 1931 /* 1932 * We negate our magic here, and NAK it. If 1933 * we see it later in an NAK packet, we 1934 * suggest a new one. 1935 */ 1936 nmagic = ~sp->lcp.magic; 1937 /* Gonna NAK it. */ 1938 p[2] = nmagic >> 24; 1939 p[3] = nmagic >> 16; 1940 p[4] = nmagic >> 8; 1941 p[5] = nmagic; 1942 break; 1943 1944 case LCP_OPT_ASYNC_MAP: 1945 /* Async control character map -- check to be zero. */ 1946 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 1947 if (debug) 1948 addlog("[empty] "); 1949 continue; 1950 } 1951 if (debug) 1952 addlog("[non-empty] "); 1953 /* suggest a zero one */ 1954 p[2] = p[3] = p[4] = p[5] = 0; 1955 break; 1956 1957 case LCP_OPT_MRU: 1958 /* 1959 * Maximum receive unit. Always agreeable, 1960 * but ignored by now. 1961 */ 1962 sp->lcp.their_mru = p[2] * 256 + p[3]; 1963 if (debug) 1964 addlog("%lu ", sp->lcp.their_mru); 1965 continue; 1966 1967 case LCP_OPT_AUTH_PROTO: 1968 authproto = (p[2] << 8) + p[3]; 1969 if (sp->myauth.proto != authproto) { 1970 /* not agreed, nak */ 1971 if (debug) 1972 addlog("[mine %s != his %s] ", 1973 sppp_proto_name(sp->hisauth.proto), 1974 sppp_proto_name(authproto)); 1975 p[2] = sp->myauth.proto >> 8; 1976 p[3] = sp->myauth.proto; 1977 break; 1978 } 1979 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 1980 if (debug) 1981 addlog("[chap not MD5] "); 1982 p[4] == CHAP_MD5; 1983 break; 1984 } 1985 continue; 1986 } 1987 /* Add the option to nak'ed list. */ 1988 bcopy (p, r, p[1]); 1989 r += p[1]; 1990 rlen += p[1]; 1991 } 1992 if (rlen) { 1993 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 1994 if (debug) 1995 addlog(" max_failure (%d) exceeded, " 1996 "send conf-rej\n", 1997 sp->lcp.max_failure); 1998 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 1999 } else { 2000 if (debug) 2001 addlog(" send conf-nak\n"); 2002 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2003 } 2004 return 0; 2005 } else { 2006 if (debug) 2007 addlog(" send conf-ack\n"); 2008 sp->fail_counter[IDX_LCP] = 0; 2009 sp->pp_loopcnt = 0; 2010 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2011 h->ident, origlen, h+1); 2012 } 2013 2014 free (buf, M_TEMP); 2015 return (rlen == 0); 2016} 2017 2018/* 2019 * Analyze the LCP Configure-Reject option list, and adjust our 2020 * negotiation. 2021 */ 2022static void 2023sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2024{ 2025 STDDCL; 2026 u_char *buf, *p; 2027 2028 len -= 4; 2029 buf = malloc (len, M_TEMP, M_NOWAIT); 2030 if (!buf) 2031 return; 2032 2033 if (debug) 2034 log(LOG_DEBUG, "%s%d: lcp rej opts: ", 2035 ifp->if_name, ifp->if_unit); 2036 2037 p = (void*) (h+1); 2038 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2039 if (debug) 2040 addlog(" %s ", sppp_lcp_opt_name(*p)); 2041 switch (*p) { 2042 case LCP_OPT_MAGIC: 2043 /* Magic number -- can't use it, use 0 */ 2044 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2045 sp->lcp.magic = 0; 2046 break; 2047 case LCP_OPT_MRU: 2048 /* 2049 * Should not be rejected anyway, since we only 2050 * negotiate a MRU if explicitly requested by 2051 * peer. 2052 */ 2053 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2054 break; 2055 case LCP_OPT_AUTH_PROTO: 2056 /* 2057 * Peer doesn't want to authenticate himself, 2058 * deny unless this is a dialout call, and 2059 * AUTHFLAG_NOCALLOUT is set. 2060 */ 2061 if ((sp->pp_flags & PP_CALLIN) == 0 && 2062 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2063 if (debug) 2064 addlog("[don't insist on auth " 2065 "for callout]"); 2066 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2067 break; 2068 } 2069 if (debug) 2070 addlog("[access denied]\n"); 2071 lcp.Close(sp); 2072 break; 2073 } 2074 } 2075 if (debug) 2076 addlog("\n"); 2077 free (buf, M_TEMP); 2078 return; 2079} 2080 2081/* 2082 * Analyze the LCP Configure-NAK option list, and adjust our 2083 * negotiation. 2084 */ 2085static void 2086sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2087{ 2088 STDDCL; 2089 u_char *buf, *p; 2090 u_long magic; 2091 2092 len -= 4; 2093 buf = malloc (len, M_TEMP, M_NOWAIT); 2094 if (!buf) 2095 return; 2096 2097 if (debug) 2098 log(LOG_DEBUG, "%s%d: lcp nak opts: ", 2099 ifp->if_name, ifp->if_unit); 2100 2101 p = (void*) (h+1); 2102 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2103 if (debug) 2104 addlog(" %s ", sppp_lcp_opt_name(*p)); 2105 switch (*p) { 2106 case LCP_OPT_MAGIC: 2107 /* Magic number -- renegotiate */ 2108 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2109 len >= 6 && p[1] == 6) { 2110 magic = (u_long)p[2] << 24 | 2111 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2112 /* 2113 * If the remote magic is our negated one, 2114 * this looks like a loopback problem. 2115 * Suggest a new magic to make sure. 2116 */ 2117 if (magic == ~sp->lcp.magic) { 2118 if (debug) 2119 addlog("magic glitch "); 2120 sp->lcp.magic = random(); 2121 } else { 2122 sp->lcp.magic = magic; 2123 if (debug) 2124 addlog("magic %lu ", magic); 2125 } 2126 } 2127 break; 2128 case LCP_OPT_MRU: 2129 /* 2130 * Peer wants to advise us to negotiate an MRU. 2131 * Agree on it if it's reasonable, or use 2132 * default otherwise. 2133 */ 2134 if (len >= 4 && p[1] == 4) { 2135 u_int mru = p[2] * 256 + p[3]; 2136 if (debug) 2137 addlog("%d ", mru); 2138 if (mru < PP_MTU || mru > PP_MAX_MRU) 2139 mru = PP_MTU; 2140 sp->lcp.mru = mru; 2141 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2142 } 2143 break; 2144 case LCP_OPT_AUTH_PROTO: 2145 /* 2146 * Peer doesn't like our authentication method, 2147 * deny. 2148 */ 2149 if (debug) 2150 addlog("[access denied]\n"); 2151 lcp.Close(sp); 2152 break; 2153 } 2154 } 2155 if (debug) 2156 addlog("\n"); 2157 free (buf, M_TEMP); 2158 return; 2159} 2160 2161static void 2162sppp_lcp_tlu(struct sppp *sp) 2163{ 2164 STDDCL; 2165 int i; 2166 u_long mask; 2167 2168 /* XXX ? */ 2169 if (! (ifp->if_flags & IFF_UP) && 2170 (ifp->if_flags & IFF_RUNNING)) { 2171 /* Coming out of loopback mode. */ 2172 if_up(ifp); 2173 printf ("%s%d: up\n", ifp->if_name, ifp->if_unit); 2174 } 2175 2176 for (i = 0; i < IDX_COUNT; i++) 2177 if ((cps[i])->flags & CP_QUAL) 2178 (cps[i])->Open(sp); 2179 2180 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2181 (sp->pp_flags & PP_NEEDAUTH) != 0) 2182 sp->pp_phase = PHASE_AUTHENTICATE; 2183 else 2184 sp->pp_phase = PHASE_NETWORK; 2185 2186 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2187 sppp_phase_name(sp->pp_phase)); 2188 2189 /* 2190 * Open all authentication protocols. This is even required 2191 * if we already proceeded to network phase, since it might be 2192 * that remote wants us to authenticate, so we might have to 2193 * send a PAP request. Undesired authentication protocols 2194 * don't do anything when they get an Open event. 2195 */ 2196 for (i = 0; i < IDX_COUNT; i++) 2197 if ((cps[i])->flags & CP_AUTH) 2198 (cps[i])->Open(sp); 2199 2200 if (sp->pp_phase == PHASE_NETWORK) { 2201 /* Notify all NCPs. */ 2202 for (i = 0; i < IDX_COUNT; i++) 2203 if ((cps[i])->flags & CP_NCP) 2204 (cps[i])->Open(sp); 2205 } 2206 2207 /* Send Up events to all started protos. */ 2208 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2209 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) 2210 (cps[i])->Up(sp); 2211 2212 if (sp->pp_phase == PHASE_NETWORK) 2213 /* if no NCP is starting, close down */ 2214 sppp_lcp_check_and_close(sp); 2215} 2216 2217static void 2218sppp_lcp_tld(struct sppp *sp) 2219{ 2220 STDDCL; 2221 int i; 2222 u_long mask; 2223 2224 sp->pp_phase = PHASE_TERMINATE; 2225 2226 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2227 sppp_phase_name(sp->pp_phase)); 2228 2229 /* 2230 * Take upper layers down. We send the Down event first and 2231 * the Close second to prevent the upper layers from sending 2232 * ``a flurry of terminate-request packets'', as the RFC 2233 * describes it. 2234 */ 2235 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2236 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) { 2237 (cps[i])->Down(sp); 2238 (cps[i])->Close(sp); 2239 } 2240} 2241 2242static void 2243sppp_lcp_tls(struct sppp *sp) 2244{ 2245 STDDCL; 2246 2247 sp->pp_phase = PHASE_ESTABLISH; 2248 2249 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2250 sppp_phase_name(sp->pp_phase)); 2251 2252 /* Notify lower layer if desired. */ 2253 if (sp->pp_tls) 2254 (sp->pp_tls)(sp); 2255} 2256 2257static void 2258sppp_lcp_tlf(struct sppp *sp) 2259{ 2260 STDDCL; 2261 2262 sp->pp_phase = PHASE_DEAD; 2263 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 2264 sppp_phase_name(sp->pp_phase)); 2265 2266 /* Notify lower layer if desired. */ 2267 if (sp->pp_tlf) 2268 (sp->pp_tlf)(sp); 2269} 2270 2271static void 2272sppp_lcp_scr(struct sppp *sp) 2273{ 2274 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2275 int i = 0; 2276 u_short authproto; 2277 2278 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2279 if (! sp->lcp.magic) 2280 sp->lcp.magic = random(); 2281 opt[i++] = LCP_OPT_MAGIC; 2282 opt[i++] = 6; 2283 opt[i++] = sp->lcp.magic >> 24; 2284 opt[i++] = sp->lcp.magic >> 16; 2285 opt[i++] = sp->lcp.magic >> 8; 2286 opt[i++] = sp->lcp.magic; 2287 } 2288 2289 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2290 opt[i++] = LCP_OPT_MRU; 2291 opt[i++] = 4; 2292 opt[i++] = sp->lcp.mru >> 8; 2293 opt[i++] = sp->lcp.mru; 2294 } 2295 2296 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2297 authproto = sp->hisauth.proto; 2298 opt[i++] = LCP_OPT_AUTH_PROTO; 2299 opt[i++] = authproto == PPP_CHAP? 5: 4; 2300 opt[i++] = authproto >> 8; 2301 opt[i++] = authproto; 2302 if (authproto == PPP_CHAP) 2303 opt[i++] = CHAP_MD5; 2304 } 2305 2306 sp->confid[IDX_LCP] = ++sp->pp_seq; 2307 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2308} 2309 2310/* 2311 * Check the open NCPs, return true if at least one NCP is open. 2312 */ 2313static int 2314sppp_ncp_check(struct sppp *sp) 2315{ 2316 int i, mask; 2317 2318 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2319 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP) 2320 return 1; 2321 return 0; 2322} 2323 2324/* 2325 * Re-check the open NCPs and see if we should terminate the link. 2326 * Called by the NCPs during their tlf action handling. 2327 */ 2328static void 2329sppp_lcp_check_and_close(struct sppp *sp) 2330{ 2331 2332 if (sp->pp_phase < PHASE_NETWORK) 2333 /* don't bother, we are already going down */ 2334 return; 2335 2336 if (sppp_ncp_check(sp)) 2337 return; 2338 2339 lcp.Close(sp); 2340} 2341 /* 2342 *--------------------------------------------------------------------------* 2343 * * 2344 * The IPCP implementation. * 2345 * * 2346 *--------------------------------------------------------------------------* 2347 */ 2348 2349static void 2350sppp_ipcp_init(struct sppp *sp) 2351{ 2352 sp->ipcp.opts = 0; 2353 sp->ipcp.flags = 0; 2354 sp->state[IDX_IPCP] = STATE_INITIAL; 2355 sp->fail_counter[IDX_IPCP] = 0; 2356 callout_handle_init(&sp->ch[IDX_IPCP]); 2357} 2358 2359static void 2360sppp_ipcp_up(struct sppp *sp) 2361{ 2362 sppp_up_event(&ipcp, sp); 2363} 2364 2365static void 2366sppp_ipcp_down(struct sppp *sp) 2367{ 2368 sppp_down_event(&ipcp, sp); 2369} 2370 2371static void 2372sppp_ipcp_open(struct sppp *sp) 2373{ 2374 STDDCL; 2375 u_long myaddr, hisaddr; 2376 2377 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2378 /* 2379 * If we don't have his address, this probably means our 2380 * interface doesn't want to talk IP at all. (This could 2381 * be the case if somebody wants to speak only IPX, for 2382 * example.) Don't open IPCP in this case. 2383 */ 2384 if (hisaddr == 0L) { 2385 /* XXX this message should go away */ 2386 if (debug) 2387 log(LOG_DEBUG, "%s%d: ipcp_open(): no IP interface\n", 2388 ifp->if_name, ifp->if_unit); 2389 return; 2390 } 2391 2392 if (myaddr == 0L) { 2393 /* 2394 * I don't have an assigned address, so i need to 2395 * negotiate my address. 2396 */ 2397 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2398 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2399 } 2400 sppp_open_event(&ipcp, sp); 2401} 2402 2403static void 2404sppp_ipcp_close(struct sppp *sp) 2405{ 2406 sppp_close_event(&ipcp, sp); 2407 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2408 /* 2409 * My address was dynamic, clear it again. 2410 */ 2411 sppp_set_ip_addr(sp, 0L); 2412} 2413 2414static void 2415sppp_ipcp_TO(void *cookie) 2416{ 2417 sppp_to_event(&ipcp, (struct sppp *)cookie); 2418} 2419 2420/* 2421 * Analyze a configure request. Return true if it was agreeable, and 2422 * caused action sca, false if it has been rejected or nak'ed, and 2423 * caused action scn. (The return value is used to make the state 2424 * transition decision in the state automaton.) 2425 */ 2426static int 2427sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2428{ 2429 u_char *buf, *r, *p; 2430 struct ifnet *ifp = &sp->pp_if; 2431 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2432 u_long hisaddr, desiredaddr; 2433 2434 len -= 4; 2435 origlen = len; 2436 /* 2437 * Make sure to allocate a buf that can at least hold a 2438 * conf-nak with an `address' option. We might need it below. 2439 */ 2440 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2441 if (! buf) 2442 return (0); 2443 2444 /* pass 1: see if we can recognize them */ 2445 if (debug) 2446 log(LOG_DEBUG, "%s%d: ipcp parse opts: ", 2447 ifp->if_name, ifp->if_unit); 2448 p = (void*) (h+1); 2449 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2450 if (debug) 2451 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2452 switch (*p) { 2453#ifdef notyet 2454 case IPCP_OPT_COMPRESSION: 2455 if (len >= 6 && p[1] >= 6) { 2456 /* correctly formed compress option */ 2457 continue; 2458 } 2459 if (debug) 2460 addlog("[invalid] "); 2461 break; 2462#endif 2463 case IPCP_OPT_ADDRESS: 2464 if (len >= 6 && p[1] == 6) { 2465 /* correctly formed address option */ 2466 continue; 2467 } 2468 if (debug) 2469 addlog("[invalid] "); 2470 break; 2471 default: 2472 /* Others not supported. */ 2473 if (debug) 2474 addlog("[rej] "); 2475 break; 2476 } 2477 /* Add the option to rejected list. */ 2478 bcopy (p, r, p[1]); 2479 r += p[1]; 2480 rlen += p[1]; 2481 } 2482 if (rlen) { 2483 if (debug) 2484 addlog(" send conf-rej\n"); 2485 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2486 return 0; 2487 } else if (debug) 2488 addlog("\n"); 2489 2490 /* pass 2: parse option values */ 2491 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2492 if (debug) 2493 log(LOG_DEBUG, "%s%d: ipcp parse opt values: ", 2494 ifp->if_name, ifp->if_unit); 2495 p = (void*) (h+1); 2496 len = origlen; 2497 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2498 if (debug) 2499 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2500 switch (*p) { 2501#ifdef notyet 2502 case IPCP_OPT_COMPRESSION: 2503 continue; 2504#endif 2505 case IPCP_OPT_ADDRESS: 2506 desiredaddr = p[2] << 24 | p[3] << 16 | 2507 p[4] << 8 | p[5]; 2508 if (desiredaddr == hisaddr || 2509 hisaddr == 1 && desiredaddr != 0) { 2510 /* 2511 * Peer's address is same as our value, 2512 * or we have set it to 0.0.0.1 to 2513 * indicate that we do not really care, 2514 * this is agreeable. Gonna conf-ack 2515 * it. 2516 */ 2517 if (debug) 2518 addlog("%s [ack] ", 2519 sppp_dotted_quad(desiredaddr)); 2520 /* record that we've seen it already */ 2521 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2522 continue; 2523 } 2524 /* 2525 * The address wasn't agreeable. This is either 2526 * he sent us 0.0.0.0, asking to assign him an 2527 * address, or he send us another address not 2528 * matching our value. Either case, we gonna 2529 * conf-nak it with our value. 2530 */ 2531 if (debug) { 2532 if (desiredaddr == 0) 2533 addlog("[addr requested] "); 2534 else 2535 addlog("%s [not agreed] ", 2536 sppp_dotted_quad(desiredaddr)); 2537 2538 p[2] = hisaddr >> 24; 2539 p[3] = hisaddr >> 16; 2540 p[4] = hisaddr >> 8; 2541 p[5] = hisaddr; 2542 } 2543 break; 2544 } 2545 /* Add the option to nak'ed list. */ 2546 bcopy (p, r, p[1]); 2547 r += p[1]; 2548 rlen += p[1]; 2549 } 2550 2551 /* 2552 * If we are about to conf-ack the request, but haven't seen 2553 * his address so far, gonna conf-nak it instead, with the 2554 * `address' option present and our idea of his address being 2555 * filled in there, to request negotiation of both addresses. 2556 * 2557 * XXX This can result in an endless req - nak loop if peer 2558 * doesn't want to send us his address. Q: What should we do 2559 * about it? XXX A: implement the max-failure counter. 2560 */ 2561 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2562 buf[0] = IPCP_OPT_ADDRESS; 2563 buf[1] = 6; 2564 buf[2] = hisaddr >> 24; 2565 buf[3] = hisaddr >> 16; 2566 buf[4] = hisaddr >> 8; 2567 buf[5] = hisaddr; 2568 rlen = 6; 2569 if (debug) 2570 addlog("still need hisaddr "); 2571 } 2572 2573 if (rlen) { 2574 if (debug) 2575 addlog(" send conf-nak\n"); 2576 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2577 } else { 2578 if (debug) 2579 addlog(" send conf-ack\n"); 2580 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2581 h->ident, origlen, h+1); 2582 } 2583 2584 free (buf, M_TEMP); 2585 return (rlen == 0); 2586} 2587 2588/* 2589 * Analyze the IPCP Configure-Reject option list, and adjust our 2590 * negotiation. 2591 */ 2592static void 2593sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2594{ 2595 u_char *buf, *p; 2596 struct ifnet *ifp = &sp->pp_if; 2597 int debug = ifp->if_flags & IFF_DEBUG; 2598 2599 len -= 4; 2600 buf = malloc (len, M_TEMP, M_NOWAIT); 2601 if (!buf) 2602 return; 2603 2604 if (debug) 2605 log(LOG_DEBUG, "%s%d: ipcp rej opts: ", 2606 ifp->if_name, ifp->if_unit); 2607 2608 p = (void*) (h+1); 2609 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2610 if (debug) 2611 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2612 switch (*p) { 2613 case IPCP_OPT_ADDRESS: 2614 /* 2615 * Peer doesn't grok address option. This is 2616 * bad. XXX Should we better give up here? 2617 */ 2618 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2619 break; 2620#ifdef notyet 2621 case IPCP_OPT_COMPRESS: 2622 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2623 break; 2624#endif 2625 } 2626 } 2627 if (debug) 2628 addlog("\n"); 2629 free (buf, M_TEMP); 2630 return; 2631} 2632 2633/* 2634 * Analyze the IPCP Configure-NAK option list, and adjust our 2635 * negotiation. 2636 */ 2637static void 2638sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2639{ 2640 u_char *buf, *p; 2641 struct ifnet *ifp = &sp->pp_if; 2642 int debug = ifp->if_flags & IFF_DEBUG; 2643 u_long wantaddr; 2644 2645 len -= 4; 2646 buf = malloc (len, M_TEMP, M_NOWAIT); 2647 if (!buf) 2648 return; 2649 2650 if (debug) 2651 log(LOG_DEBUG, "%s%d: ipcp nak opts: ", 2652 ifp->if_name, ifp->if_unit); 2653 2654 p = (void*) (h+1); 2655 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2656 if (debug) 2657 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2658 switch (*p) { 2659 case IPCP_OPT_ADDRESS: 2660 /* 2661 * Peer doesn't like our local IP address. See 2662 * if we can do something for him. We'll drop 2663 * him our address then. 2664 */ 2665 if (len >= 6 && p[1] == 6) { 2666 wantaddr = p[2] << 24 | p[3] << 16 | 2667 p[4] << 8 | p[5]; 2668 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2669 if (debug) 2670 addlog("[wantaddr %s] ", 2671 sppp_dotted_quad(wantaddr)); 2672 /* 2673 * When doing dynamic address assignment, 2674 * we accept his offer. Otherwise, we 2675 * ignore it and thus continue to negotiate 2676 * our already existing value. 2677 */ 2678 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2679 sppp_set_ip_addr(sp, wantaddr); 2680 if (debug) 2681 addlog("[agree] "); 2682 } 2683 } 2684 break; 2685#ifdef notyet 2686 case IPCP_OPT_COMPRESS: 2687 /* 2688 * Peer wants different compression parameters. 2689 */ 2690 break; 2691#endif 2692 } 2693 } 2694 if (debug) 2695 addlog("\n"); 2696 free (buf, M_TEMP); 2697 return; 2698} 2699 2700static void 2701sppp_ipcp_tlu(struct sppp *sp) 2702{ 2703} 2704 2705static void 2706sppp_ipcp_tld(struct sppp *sp) 2707{ 2708} 2709 2710static void 2711sppp_ipcp_tls(struct sppp *sp) 2712{ 2713 /* indicate to LCP that it must stay alive */ 2714 sp->lcp.protos |= (1 << IDX_IPCP); 2715} 2716 2717static void 2718sppp_ipcp_tlf(struct sppp *sp) 2719{ 2720 /* we no longer need LCP */ 2721 sp->lcp.protos &= ~(1 << IDX_IPCP); 2722 sppp_lcp_check_and_close(sp); 2723} 2724 2725static void 2726sppp_ipcp_scr(struct sppp *sp) 2727{ 2728 char opt[6 /* compression */ + 6 /* address */]; 2729 u_long ouraddr; 2730 int i = 0; 2731 2732#ifdef notyet 2733 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 2734 opt[i++] = IPCP_OPT_COMPRESSION; 2735 opt[i++] = 6; 2736 opt[i++] = 0; /* VJ header compression */ 2737 opt[i++] = 0x2d; /* VJ header compression */ 2738 opt[i++] = max_slot_id; 2739 opt[i++] = comp_slot_id; 2740 } 2741#endif 2742 2743 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 2744 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 2745 opt[i++] = IPCP_OPT_ADDRESS; 2746 opt[i++] = 6; 2747 opt[i++] = ouraddr >> 24; 2748 opt[i++] = ouraddr >> 16; 2749 opt[i++] = ouraddr >> 8; 2750 opt[i++] = ouraddr; 2751 } 2752 2753 sp->confid[IDX_IPCP] = ++sp->pp_seq; 2754 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 2755} 2756 2757 2758 /* 2759 *--------------------------------------------------------------------------* 2760 * * 2761 * The CHAP implementation. * 2762 * * 2763 *--------------------------------------------------------------------------* 2764 */ 2765 2766/* 2767 * The authentication protocols don't employ a full-fledged state machine as 2768 * the control protocols do, since they do have Open and Close events, but 2769 * not Up and Down, nor are they explicitly terminated. Also, use of the 2770 * authentication protocols may be different in both directions (this makes 2771 * sense, think of a machine that never accepts incoming calls but only 2772 * calls out, it doesn't require the called party to authenticate itself). 2773 * 2774 * Our state machine for the local authentication protocol (we are requesting 2775 * the peer to authenticate) looks like: 2776 * 2777 * RCA- 2778 * +--------------------------------------------+ 2779 * V scn,tld| 2780 * +--------+ Close +---------+ RCA+ 2781 * | |<----------------------------------| |------+ 2782 * +--->| Closed | TO* | Opened | sca | 2783 * | | |-----+ +-------| |<-----+ 2784 * | +--------+ irc | | +---------+ 2785 * | ^ | | ^ 2786 * | | | | | 2787 * | | | | | 2788 * | TO-| | | | 2789 * | |tld TO+ V | | 2790 * | | +------->+ | | 2791 * | | | | | | 2792 * | +--------+ V | | 2793 * | | |<----+<--------------------+ | 2794 * | | Req- | scr | 2795 * | | Sent | | 2796 * | | | | 2797 * | +--------+ | 2798 * | RCA- | | RCA+ | 2799 * +------+ +------------------------------------------+ 2800 * scn,tld sca,irc,ict,tlu 2801 * 2802 * 2803 * with: 2804 * 2805 * Open: LCP reached authentication phase 2806 * Close: LCP reached terminate phase 2807 * 2808 * RCA+: received reply (pap-req, chap-response), acceptable 2809 * RCN: received reply (pap-req, chap-response), not acceptable 2810 * TO+: timeout with restart counter >= 0 2811 * TO-: timeout with restart counter < 0 2812 * TO*: reschedule timeout for CHAP 2813 * 2814 * scr: send request packet (none for PAP, chap-challenge) 2815 * sca: send ack packet (pap-ack, chap-success) 2816 * scn: send nak packet (pap-nak, chap-failure) 2817 * ict: initialize re-challenge timer (CHAP only) 2818 * 2819 * tlu: this-layer-up, LCP reaches network phase 2820 * tld: this-layer-down, LCP enters terminate phase 2821 * 2822 * Note that in CHAP mode, after sending a new challenge, while the state 2823 * automaton falls back into Req-Sent state, it doesn't signal a tld 2824 * event to LCP, so LCP remains in network phase. Only after not getting 2825 * any response (or after getting an unacceptable response), CHAP closes, 2826 * causing LCP to enter terminate phase. 2827 * 2828 * With PAP, there is no initial request that can be sent. The peer is 2829 * expected to send one based on the successful negotiation of PAP as 2830 * the authentication protocol during the LCP option negotiation. 2831 * 2832 * Incoming authentication protocol requests (remote requests 2833 * authentication, we are peer) don't employ a state machine at all, 2834 * they are simply answered. Some peers [Ascend P50 firmware rev 2835 * 4.50] react allergically when sending IPCP requests while they are 2836 * still in authentication phase (thereby violating the standard that 2837 * demands that these NCP packets are to be discarded), so we keep 2838 * track of the peer demanding us to authenticate, and only proceed to 2839 * phase network once we've seen a positive acknowledge for the 2840 * authentication. 2841 */ 2842 2843/* 2844 * Handle incoming CHAP packets. 2845 */ 2846void 2847sppp_chap_input(struct sppp *sp, struct mbuf *m) 2848{ 2849 STDDCL; 2850 struct lcp_header *h; 2851 int len, x; 2852 u_char *value, *name, digest[AUTHKEYLEN], dsize; 2853 int value_len, name_len; 2854 MD5_CTX ctx; 2855 2856 len = m->m_pkthdr.len; 2857 if (len < 4) { 2858 if (debug) 2859 log(LOG_DEBUG, 2860 "%s%d: chap invalid packet length: %d bytes\n", 2861 ifp->if_name, ifp->if_unit, len); 2862 return; 2863 } 2864 h = mtod (m, struct lcp_header*); 2865 if (len > ntohs (h->len)) 2866 len = ntohs (h->len); 2867 2868 switch (h->type) { 2869 /* challenge, failure and success are his authproto */ 2870 case CHAP_CHALLENGE: 2871 value = 1 + (u_char*)(h+1); 2872 value_len = value[-1]; 2873 name = value + value_len; 2874 name_len = len - value_len - 5; 2875 if (name_len < 0) { 2876 if (debug) { 2877 log(LOG_DEBUG, 2878 "%s%d: chap corrupted challenge " 2879 "<%s id=0x%x len=%d", 2880 ifp->if_name, ifp->if_unit, 2881 sppp_auth_type_name(PPP_CHAP, h->type), 2882 h->ident, ntohs(h->len)); 2883 if (len > 4) 2884 sppp_print_bytes((u_char*) (h+1), len-4); 2885 addlog(">\n"); 2886 } 2887 break; 2888 } 2889 2890 if (debug) { 2891 log(LOG_DEBUG, 2892 "%s%d: chap input <%s id=0x%x len=%d name=", 2893 ifp->if_name, ifp->if_unit, 2894 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 2895 ntohs(h->len)); 2896 sppp_print_string((char*) name, name_len); 2897 addlog(" value-size=%d value=", value_len); 2898 sppp_print_bytes(value, value_len); 2899 addlog(">\n"); 2900 } 2901 2902 /* Compute reply value. */ 2903 MD5Init(&ctx); 2904 MD5Update(&ctx, &h->ident, 1); 2905 MD5Update(&ctx, sp->myauth.secret, 2906 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 2907 MD5Update(&ctx, value, value_len); 2908 MD5Final(digest, &ctx); 2909 dsize = sizeof digest; 2910 2911 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 2912 sizeof dsize, (const char *)&dsize, 2913 sizeof digest, digest, 2914 sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 2915 sp->myauth.name, 2916 0); 2917 break; 2918 2919 case CHAP_SUCCESS: 2920 if (debug) { 2921 log(LOG_DEBUG, "%s%d: chap success", 2922 ifp->if_name, ifp->if_unit); 2923 if (len > 4) { 2924 addlog(": "); 2925 sppp_print_string((char*)(h + 1), len - 4); 2926 } 2927 addlog("\n"); 2928 } 2929 x = splimp(); 2930 sp->pp_flags &= ~PP_NEEDAUTH; 2931 if (sp->myauth.proto == PPP_CHAP && 2932 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 2933 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 2934 /* 2935 * We are authenticator for CHAP but didn't 2936 * complete yet. Leave it to tlu to proceed 2937 * to network phase. 2938 */ 2939 splx(x); 2940 break; 2941 } 2942 splx(x); 2943 sppp_phase_network(sp); 2944 break; 2945 2946 case CHAP_FAILURE: 2947 if (debug) { 2948 log(LOG_INFO, "%s%d: chap failure", 2949 ifp->if_name, ifp->if_unit); 2950 if (len > 4) { 2951 addlog(": "); 2952 sppp_print_string((char*)(h + 1), len - 4); 2953 } 2954 addlog("\n"); 2955 } else 2956 log(LOG_INFO, "%s%d: chap failure\n", 2957 ifp->if_name, ifp->if_unit); 2958 /* await LCP shutdown by authenticator */ 2959 break; 2960 2961 /* response is my authproto */ 2962 case CHAP_RESPONSE: 2963 value = 1 + (u_char*)(h+1); 2964 value_len = value[-1]; 2965 name = value + value_len; 2966 name_len = len - value_len - 5; 2967 if (name_len < 0) { 2968 if (debug) { 2969 log(LOG_DEBUG, 2970 "%s%d: chap corrupted response " 2971 "<%s id=0x%x len=%d", 2972 ifp->if_name, ifp->if_unit, 2973 sppp_auth_type_name(PPP_CHAP, h->type), 2974 h->ident, ntohs(h->len)); 2975 if (len > 4) 2976 sppp_print_bytes((u_char*)(h+1), len-4); 2977 addlog(">\n"); 2978 } 2979 break; 2980 } 2981 if (h->ident != sp->confid[IDX_CHAP]) { 2982 if (debug) 2983 log(LOG_DEBUG, 2984 "%s%d: chap dropping response for old ID " 2985 "(got %d, expected %d)\n", 2986 ifp->if_name, ifp->if_unit, 2987 h->ident, sp->confid[IDX_CHAP]); 2988 break; 2989 } 2990 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 2991 || bcmp(name, sp->hisauth.name, name_len) != 0) { 2992 log(LOG_INFO, "%s%d: chap response, his name ", 2993 ifp->if_name, ifp->if_unit); 2994 sppp_print_string(name, name_len); 2995 addlog(" != expected "); 2996 sppp_print_string(sp->hisauth.name, 2997 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 2998 addlog("\n"); 2999 } 3000 if (debug) { 3001 log(LOG_DEBUG, "%s%d: chap input(%s) " 3002 "<%s id=0x%x len=%d name=", 3003 ifp->if_name, ifp->if_unit, 3004 sppp_state_name(sp->state[IDX_CHAP]), 3005 sppp_auth_type_name(PPP_CHAP, h->type), 3006 h->ident, ntohs (h->len)); 3007 sppp_print_string((char*)name, name_len); 3008 addlog(" value-size=%d value=", value_len); 3009 sppp_print_bytes(value, value_len); 3010 addlog(">\n"); 3011 } 3012 if (value_len != AUTHKEYLEN) { 3013 if (debug) 3014 log(LOG_DEBUG, 3015 "%s%d: chap bad hash value length: " 3016 "%d bytes, should be %d\n", 3017 ifp->if_name, ifp->if_unit, value_len, 3018 AUTHKEYLEN); 3019 break; 3020 } 3021 3022 MD5Init(&ctx); 3023 MD5Update(&ctx, &h->ident, 1); 3024 MD5Update(&ctx, sp->hisauth.secret, 3025 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3026 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3027 MD5Final(digest, &ctx); 3028 3029#define FAILMSG "Failed..." 3030#define SUCCMSG "Welcome!" 3031 3032 if (value_len != sizeof digest || 3033 bcmp(digest, value, value_len) != 0) { 3034 /* action scn, tld */ 3035 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3036 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3037 0); 3038 chap.tld(sp); 3039 break; 3040 } 3041 /* action sca, perhaps tlu */ 3042 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3043 sp->state[IDX_CHAP] == STATE_OPENED) 3044 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3045 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3046 0); 3047 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3048 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3049 chap.tlu(sp); 3050 } 3051 break; 3052 3053 default: 3054 /* Unknown CHAP packet type -- ignore. */ 3055 if (debug) { 3056 log(LOG_DEBUG, "%s%d: chap unknown input(%s) " 3057 "<0x%x id=0x%xh len=%d", 3058 ifp->if_name, ifp->if_unit, 3059 sppp_state_name(sp->state[IDX_CHAP]), 3060 h->type, h->ident, ntohs(h->len)); 3061 if (len > 4) 3062 sppp_print_bytes((u_char*)(h+1), len-4); 3063 addlog(">\n"); 3064 } 3065 break; 3066 3067 } 3068} 3069 3070static void 3071sppp_chap_init(struct sppp *sp) 3072{ 3073 /* Chap doesn't have STATE_INITIAL at all. */ 3074 sp->state[IDX_CHAP] = STATE_CLOSED; 3075 sp->fail_counter[IDX_CHAP] = 0; 3076 callout_handle_init(&sp->ch[IDX_CHAP]); 3077} 3078 3079static void 3080sppp_chap_open(struct sppp *sp) 3081{ 3082 if (sp->myauth.proto == PPP_CHAP && 3083 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3084 /* we are authenticator for CHAP, start it */ 3085 chap.scr(sp); 3086 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3087 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3088 } 3089 /* nothing to be done if we are peer, await a challenge */ 3090} 3091 3092static void 3093sppp_chap_close(struct sppp *sp) 3094{ 3095 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3096 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3097} 3098 3099static void 3100sppp_chap_TO(void *cookie) 3101{ 3102 struct sppp *sp = (struct sppp *)cookie; 3103 STDDCL; 3104 int s; 3105 3106 s = splimp(); 3107 if (debug) 3108 log(LOG_DEBUG, "%s%d: chap TO(%s) rst_counter = %d\n", 3109 ifp->if_name, ifp->if_unit, 3110 sppp_state_name(sp->state[IDX_CHAP]), 3111 sp->rst_counter[IDX_CHAP]); 3112 3113 if (--sp->rst_counter[IDX_CHAP] < 0) 3114 /* TO- event */ 3115 switch (sp->state[IDX_CHAP]) { 3116 case STATE_REQ_SENT: 3117 chap.tld(sp); 3118 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3119 break; 3120 } 3121 else 3122 /* TO+ (or TO*) event */ 3123 switch (sp->state[IDX_CHAP]) { 3124 case STATE_OPENED: 3125 /* TO* event */ 3126 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3127 /* fall through */ 3128 case STATE_REQ_SENT: 3129 chap.scr(sp); 3130 /* sppp_cp_change_state() will restart the timer */ 3131 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3132 break; 3133 } 3134 3135 splx(s); 3136} 3137 3138static void 3139sppp_chap_tlu(struct sppp *sp) 3140{ 3141 STDDCL; 3142 int i, x; 3143 3144 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3145 3146 /* 3147 * Some broken CHAP implementations (Conware CoNet, firmware 3148 * 4.0.?) don't want to re-authenticate their CHAP once the 3149 * initial challenge-response exchange has taken place. 3150 * Provide for an option to avoid rechallenges. 3151 */ 3152 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3153 /* 3154 * Compute the re-challenge timeout. This will yield 3155 * a number between 300 and 810 seconds. 3156 */ 3157 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3158 3159 sp->ch[IDX_CHAP] = timeout(chap.TO, (void *)sp, i * hz); 3160 } 3161 3162 if (debug) { 3163 log(LOG_DEBUG, 3164 "%s%d: chap %s, ", 3165 ifp->if_name, ifp->if_unit, 3166 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3167 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3168 addlog("next re-challenge in %d seconds\n", i); 3169 else 3170 addlog("re-challenging supressed\n"); 3171 } 3172 3173 x = splimp(); 3174 /* indicate to LCP that we need to be closed down */ 3175 sp->lcp.protos |= (1 << IDX_CHAP); 3176 3177 if (sp->pp_flags & PP_NEEDAUTH) { 3178 /* 3179 * Remote is authenticator, but his auth proto didn't 3180 * complete yet. Defer the transition to network 3181 * phase. 3182 */ 3183 splx(x); 3184 return; 3185 } 3186 splx(x); 3187 3188 /* 3189 * If we are already in phase network, we are done here. This 3190 * is the case if this is a dummy tlu event after a re-challenge. 3191 */ 3192 if (sp->pp_phase != PHASE_NETWORK) 3193 sppp_phase_network(sp); 3194} 3195 3196static void 3197sppp_chap_tld(struct sppp *sp) 3198{ 3199 STDDCL; 3200 3201 if (debug) 3202 log(LOG_DEBUG, "%s%d: chap tld\n", ifp->if_name, ifp->if_unit); 3203 untimeout(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 3204 sp->lcp.protos &= ~(1 << IDX_CHAP); 3205 3206 lcp.Close(sp); 3207} 3208 3209static void 3210sppp_chap_scr(struct sppp *sp) 3211{ 3212 struct timeval tv; 3213 u_long *ch, seed; 3214 u_char clen; 3215 3216 /* Compute random challenge. */ 3217 ch = (u_long *)sp->myauth.challenge; 3218 /* 3219 * XXX: This is bad!, there is a well known relationship between the 3220 * four groups of four bytes in the challenge, that improves the 3221 * predictability quite a lot. 3222 */ 3223 read_random(&seed, sizeof seed); 3224 ch[0] = seed ^ random(); 3225 ch[1] = seed ^ random(); 3226 ch[2] = seed ^ random(); 3227 ch[3] = seed ^ random(); 3228 clen = AUTHKEYLEN; 3229 3230 sp->confid[IDX_CHAP] = ++sp->pp_seq; 3231 3232 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 3233 sizeof clen, (const char *)&clen, 3234 AUTHKEYLEN, sp->myauth.challenge, 3235 sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3236 sp->myauth.name, 3237 0); 3238} 3239 /* 3240 *--------------------------------------------------------------------------* 3241 * * 3242 * The PAP implementation. * 3243 * * 3244 *--------------------------------------------------------------------------* 3245 */ 3246/* 3247 * For PAP, we need to keep a little state also if we are the peer, not the 3248 * authenticator. This is since we don't get a request to authenticate, but 3249 * have to repeatedly authenticate ourself until we got a response (or the 3250 * retry counter is expired). 3251 */ 3252 3253/* 3254 * Handle incoming PAP packets. */ 3255static void 3256sppp_pap_input(struct sppp *sp, struct mbuf *m) 3257{ 3258 STDDCL; 3259 struct lcp_header *h; 3260 int len, x; 3261 u_char *name, *passwd, mlen; 3262 int name_len, passwd_len; 3263 3264 len = m->m_pkthdr.len; 3265 if (len < 5) { 3266 if (debug) 3267 log(LOG_DEBUG, 3268 "%s%d: pap invalid packet length: %d bytes\n", 3269 ifp->if_name, ifp->if_unit, len); 3270 return; 3271 } 3272 h = mtod (m, struct lcp_header*); 3273 if (len > ntohs (h->len)) 3274 len = ntohs (h->len); 3275 switch (h->type) { 3276 /* PAP request is my authproto */ 3277 case PAP_REQ: 3278 name = 1 + (u_char*)(h+1); 3279 name_len = name[-1]; 3280 passwd = name + name_len + 1; 3281 if (name_len > len - 6 || 3282 (passwd_len = passwd[-1]) > len - 6 - name_len) { 3283 if (debug) { 3284 log(LOG_DEBUG, "%s%d: pap corrupted input " 3285 "<%s id=0x%x len=%d", 3286 ifp->if_name, ifp->if_unit, 3287 sppp_auth_type_name(PPP_PAP, h->type), 3288 h->ident, ntohs(h->len)); 3289 if (len > 4) 3290 sppp_print_bytes((u_char*)(h+1), len-4); 3291 addlog(">\n"); 3292 } 3293 break; 3294 } 3295 if (debug) { 3296 log(LOG_DEBUG, "%s%d: pap input(%s) " 3297 "<%s id=0x%x len=%d name=", 3298 ifp->if_name, ifp->if_unit, 3299 sppp_state_name(sp->state[IDX_PAP]), 3300 sppp_auth_type_name(PPP_PAP, h->type), 3301 h->ident, ntohs(h->len)); 3302 sppp_print_string((char*)name, name_len); 3303 addlog(" passwd="); 3304 sppp_print_string((char*)passwd, passwd_len); 3305 addlog(">\n"); 3306 } 3307 if (name_len > AUTHNAMELEN || 3308 passwd_len > AUTHKEYLEN || 3309 bcmp(name, sp->hisauth.name, name_len) != 0 || 3310 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 3311 /* action scn, tld */ 3312 mlen = sizeof(FAILMSG) - 1; 3313 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 3314 sizeof mlen, (const char *)&mlen, 3315 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3316 0); 3317 pap.tld(sp); 3318 break; 3319 } 3320 /* action sca, perhaps tlu */ 3321 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 3322 sp->state[IDX_PAP] == STATE_OPENED) { 3323 mlen = sizeof(SUCCMSG) - 1; 3324 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 3325 sizeof mlen, (const char *)&mlen, 3326 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3327 0); 3328 } 3329 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 3330 sppp_cp_change_state(&pap, sp, STATE_OPENED); 3331 pap.tlu(sp); 3332 } 3333 break; 3334 3335 /* ack and nak are his authproto */ 3336 case PAP_ACK: 3337 untimeout(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3338 if (debug) { 3339 log(LOG_DEBUG, "%s%d: pap success", 3340 ifp->if_name, ifp->if_unit); 3341 name_len = *((char *)h); 3342 if (len > 5 && name_len) { 3343 addlog(": "); 3344 sppp_print_string((char*)(h+1), name_len); 3345 } 3346 addlog("\n"); 3347 } 3348 x = splimp(); 3349 sp->pp_flags &= ~PP_NEEDAUTH; 3350 if (sp->myauth.proto == PPP_PAP && 3351 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3352 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 3353 /* 3354 * We are authenticator for PAP but didn't 3355 * complete yet. Leave it to tlu to proceed 3356 * to network phase. 3357 */ 3358 splx(x); 3359 break; 3360 } 3361 splx(x); 3362 sppp_phase_network(sp); 3363 break; 3364 3365 case PAP_NAK: 3366 untimeout(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3367 if (debug) { 3368 log(LOG_INFO, "%s%d: pap failure", 3369 ifp->if_name, ifp->if_unit); 3370 name_len = *((char *)h); 3371 if (len > 5 && name_len) { 3372 addlog(": "); 3373 sppp_print_string((char*)(h+1), name_len); 3374 } 3375 addlog("\n"); 3376 } else 3377 log(LOG_INFO, "%s%d: pap failure\n", 3378 ifp->if_name, ifp->if_unit); 3379 /* await LCP shutdown by authenticator */ 3380 break; 3381 3382 default: 3383 /* Unknown PAP packet type -- ignore. */ 3384 if (debug) { 3385 log(LOG_DEBUG, "%s%d: pap corrupted input " 3386 "<0x%x id=0x%x len=%d", 3387 ifp->if_name, ifp->if_unit, 3388 h->type, h->ident, ntohs(h->len)); 3389 if (len > 4) 3390 sppp_print_bytes((u_char*)(h+1), len-4); 3391 addlog(">\n"); 3392 } 3393 break; 3394 3395 } 3396} 3397 3398static void 3399sppp_pap_init(struct sppp *sp) 3400{ 3401 /* PAP doesn't have STATE_INITIAL at all. */ 3402 sp->state[IDX_PAP] = STATE_CLOSED; 3403 sp->fail_counter[IDX_PAP] = 0; 3404 callout_handle_init(&sp->ch[IDX_PAP]); 3405 callout_handle_init(&sp->pap_my_to_ch); 3406} 3407 3408static void 3409sppp_pap_open(struct sppp *sp) 3410{ 3411 if (sp->hisauth.proto == PPP_PAP && 3412 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3413 /* we are authenticator for PAP, start our timer */ 3414 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 3415 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 3416 } 3417 if (sp->myauth.proto == PPP_PAP) { 3418 /* we are peer, send a request, and start a timer */ 3419 pap.scr(sp); 3420 sp->pap_my_to_ch = timeout(sppp_pap_my_TO, (void *)sp, 3421 sp->lcp.timeout); 3422 } 3423} 3424 3425static void 3426sppp_pap_close(struct sppp *sp) 3427{ 3428 if (sp->state[IDX_PAP] != STATE_CLOSED) 3429 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 3430} 3431 3432/* 3433 * That's the timeout routine if we are authenticator. Since the 3434 * authenticator is basically passive in PAP, we can't do much here. 3435 */ 3436static void 3437sppp_pap_TO(void *cookie) 3438{ 3439 struct sppp *sp = (struct sppp *)cookie; 3440 STDDCL; 3441 int s; 3442 3443 s = splimp(); 3444 if (debug) 3445 log(LOG_DEBUG, "%s%d: pap TO(%s) rst_counter = %d\n", 3446 ifp->if_name, ifp->if_unit, 3447 sppp_state_name(sp->state[IDX_PAP]), 3448 sp->rst_counter[IDX_PAP]); 3449 3450 if (--sp->rst_counter[IDX_PAP] < 0) 3451 /* TO- event */ 3452 switch (sp->state[IDX_PAP]) { 3453 case STATE_REQ_SENT: 3454 pap.tld(sp); 3455 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 3456 break; 3457 } 3458 else 3459 /* TO+ event, not very much we could do */ 3460 switch (sp->state[IDX_PAP]) { 3461 case STATE_REQ_SENT: 3462 /* sppp_cp_change_state() will restart the timer */ 3463 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 3464 break; 3465 } 3466 3467 splx(s); 3468} 3469 3470/* 3471 * That's the timeout handler if we are peer. Since the peer is active, 3472 * we need to retransmit our PAP request since it is apparently lost. 3473 * XXX We should impose a max counter. 3474 */ 3475static void 3476sppp_pap_my_TO(void *cookie) 3477{ 3478 struct sppp *sp = (struct sppp *)cookie; 3479 STDDCL; 3480 3481 if (debug) 3482 log(LOG_DEBUG, "%s%d: pap peer TO\n", 3483 ifp->if_name, ifp->if_unit); 3484 3485 pap.scr(sp); 3486} 3487 3488static void 3489sppp_pap_tlu(struct sppp *sp) 3490{ 3491 STDDCL; 3492 int x; 3493 3494 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 3495 3496 if (debug) 3497 log(LOG_DEBUG, "%s%d: %s tlu\n", 3498 ifp->if_name, ifp->if_unit, pap.name); 3499 3500 x = splimp(); 3501 /* indicate to LCP that we need to be closed down */ 3502 sp->lcp.protos |= (1 << IDX_PAP); 3503 3504 if (sp->pp_flags & PP_NEEDAUTH) { 3505 /* 3506 * Remote is authenticator, but his auth proto didn't 3507 * complete yet. Defer the transition to network 3508 * phase. 3509 */ 3510 splx(x); 3511 return; 3512 } 3513 splx(x); 3514 sppp_phase_network(sp); 3515} 3516 3517static void 3518sppp_pap_tld(struct sppp *sp) 3519{ 3520 STDDCL; 3521 3522 if (debug) 3523 log(LOG_DEBUG, "%s%d: pap tld\n", ifp->if_name, ifp->if_unit); 3524 untimeout(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 3525 untimeout(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3526 sp->lcp.protos &= ~(1 << IDX_PAP); 3527 3528 lcp.Close(sp); 3529} 3530 3531static void 3532sppp_pap_scr(struct sppp *sp) 3533{ 3534 STDDCL; 3535 u_char idlen, pwdlen; 3536 3537 sp->confid[IDX_PAP] = ++sp->pp_seq; 3538 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 3539 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 3540 3541 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 3542 sizeof idlen, (const char *)&idlen, 3543 (unsigned)idlen, sp->myauth.name, 3544 sizeof pwdlen, (const char *)&pwdlen, 3545 (unsigned)pwdlen, sp->myauth.secret, 3546 0); 3547} 3548 /* 3549 * Random miscellaneous functions. 3550 */ 3551 3552/* 3553 * Send a PAP or CHAP proto packet. 3554 * 3555 * Varadic function, each of the elements for the ellipsis is of type 3556 * ``unsigned mlen, const u_char *msg''. Processing will stop iff 3557 * mlen == 0. 3558 */ 3559 3560static void 3561sppp_auth_send(const struct cp *cp, struct sppp *sp, u_char type, u_char id, 3562 ...) 3563{ 3564 STDDCL; 3565 struct ppp_header *h; 3566 struct lcp_header *lh; 3567 struct mbuf *m; 3568 u_char *p; 3569 int len; 3570 unsigned mlen; 3571 const char *msg; 3572 va_list ap; 3573 3574 MGETHDR (m, M_DONTWAIT, MT_DATA); 3575 if (! m) 3576 return; 3577 m->m_pkthdr.rcvif = 0; 3578 3579 h = mtod (m, struct ppp_header*); 3580 h->address = PPP_ALLSTATIONS; /* broadcast address */ 3581 h->control = PPP_UI; /* Unnumbered Info */ 3582 h->protocol = htons(cp->proto); 3583 3584 lh = (struct lcp_header*)(h + 1); 3585 lh->type = type; 3586 lh->ident = id; 3587 p = (u_char*) (lh+1); 3588 3589 va_start(ap, id); 3590 len = 0; 3591 3592 while ((mlen = va_arg(ap, unsigned)) != 0) { 3593 msg = va_arg(ap, const char *); 3594 len += mlen; 3595 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 3596 va_end(ap); 3597 m_freem(m); 3598 return; 3599 } 3600 3601 bcopy(msg, p, mlen); 3602 p += mlen; 3603 } 3604 va_end(ap); 3605 3606 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 3607 lh->len = htons (LCP_HEADER_LEN + len); 3608 3609 if (debug) { 3610 log(LOG_DEBUG, "%s%d: %s output <%s id=0x%x len=%d", 3611 ifp->if_name, ifp->if_unit, cp->name, 3612 sppp_auth_type_name(cp->proto, lh->type), 3613 lh->ident, ntohs(lh->len)); 3614 if (len) 3615 sppp_print_bytes((u_char*) (lh+1), len); 3616 addlog(">\n"); 3617 } 3618 if (IF_QFULL (&sp->pp_cpq)) { 3619 IF_DROP (&sp->pp_fastq); 3620 IF_DROP (&ifp->if_snd); 3621 m_freem (m); 3622 ++ifp->if_oerrors; 3623 } else 3624 IF_ENQUEUE (&sp->pp_cpq, m); 3625 if (! (ifp->if_flags & IFF_OACTIVE)) 3626 (*ifp->if_start) (ifp); 3627 ifp->if_obytes += m->m_pkthdr.len + 3; 3628} 3629 3630/* 3631 * Flush interface queue. 3632 */ 3633static void 3634sppp_qflush(struct ifqueue *ifq) 3635{ 3636 struct mbuf *m, *n; 3637 3638 n = ifq->ifq_head; 3639 while ((m = n)) { 3640 n = m->m_act; 3641 m_freem (m); 3642 } 3643 ifq->ifq_head = 0; 3644 ifq->ifq_tail = 0; 3645 ifq->ifq_len = 0; 3646} 3647 3648/* 3649 * Send keepalive packets, every 10 seconds. 3650 */ 3651static void 3652sppp_keepalive(void *dummy) 3653{ 3654 struct sppp *sp; 3655 int s; 3656 3657 s = splimp(); 3658 for (sp=spppq; sp; sp=sp->pp_next) { 3659 struct ifnet *ifp = &sp->pp_if; 3660 3661 /* Keepalive mode disabled or channel down? */ 3662 if (! (sp->pp_flags & PP_KEEPALIVE) || 3663 ! (ifp->if_flags & IFF_RUNNING)) 3664 continue; 3665 3666 /* No keepalive in PPP mode if LCP not opened yet. */ 3667 if (! (sp->pp_flags & PP_CISCO) && 3668 sp->pp_phase < PHASE_AUTHENTICATE) 3669 continue; 3670 3671 if (sp->pp_alivecnt == MAXALIVECNT) { 3672 /* No keepalive packets got. Stop the interface. */ 3673 printf ("%s%d: down\n", ifp->if_name, ifp->if_unit); 3674 if_down (ifp); 3675 sppp_qflush (&sp->pp_cpq); 3676 if (! (sp->pp_flags & PP_CISCO)) { 3677 /* XXX */ 3678 /* Shut down the PPP link. */ 3679 lcp.Down(sp); 3680 /* Initiate negotiation. XXX */ 3681 lcp.Up(sp); 3682 } 3683 } 3684 if (sp->pp_alivecnt <= MAXALIVECNT) 3685 ++sp->pp_alivecnt; 3686 if (sp->pp_flags & PP_CISCO) 3687 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, 3688 sp->pp_rseq); 3689 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 3690 long nmagic = htonl (sp->lcp.magic); 3691 sp->lcp.echoid = ++sp->pp_seq; 3692 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 3693 sp->lcp.echoid, 4, &nmagic); 3694 } 3695 } 3696 splx(s); 3697 keepalive_ch = timeout(sppp_keepalive, 0, hz * 10); 3698} 3699 3700/* 3701 * Get both IP addresses. 3702 */ 3703static void 3704sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 3705{ 3706 struct ifnet *ifp = &sp->pp_if; 3707 struct ifaddr *ifa; 3708 struct sockaddr_in *si, *sm; 3709 u_long ssrc, ddst; 3710 3711 ssrc = ddst = 0L; 3712 /* 3713 * Pick the first AF_INET address from the list, 3714 * aliases don't make any sense on a p2p link anyway. 3715 */ 3716 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 3717 ifa; 3718 ifa = ifa->ifa_link.tqe_next) 3719 if (ifa->ifa_addr->sa_family == AF_INET) { 3720 si = (struct sockaddr_in *)ifa->ifa_addr; 3721 sm = (struct sockaddr_in *)ifa->ifa_netmask; 3722 if (si) 3723 break; 3724 } 3725 if (ifa) { 3726 if (si && si->sin_addr.s_addr) { 3727 ssrc = si->sin_addr.s_addr; 3728 if (srcmask) 3729 *srcmask = ntohl(sm->sin_addr.s_addr); 3730 } 3731 3732 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 3733 if (si && si->sin_addr.s_addr) 3734 ddst = si->sin_addr.s_addr; 3735 } 3736 3737 if (dst) *dst = ntohl(ddst); 3738 if (src) *src = ntohl(ssrc); 3739} 3740 3741/* 3742 * Set my IP address. Must be called at splimp. 3743 */ 3744static void 3745sppp_set_ip_addr(struct sppp *sp, u_long src) 3746{ 3747 struct ifnet *ifp = &sp->pp_if; 3748 struct ifaddr *ifa; 3749 struct sockaddr_in *si; 3750 u_long ssrc, ddst; 3751 3752 /* 3753 * Pick the first AF_INET address from the list, 3754 * aliases don't make any sense on a p2p link anyway. 3755 */ 3756 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 3757 ifa; 3758 ifa = ifa->ifa_link.tqe_next) 3759 if (ifa->ifa_addr->sa_family == AF_INET) { 3760 si = (struct sockaddr_in *)ifa->ifa_addr; 3761 if (si) 3762 break; 3763 } 3764 if (ifa && si) 3765 si->sin_addr.s_addr = htonl(src); 3766} 3767 3768static int 3769sppp_params(struct sppp *sp, u_long cmd, void *data) 3770{ 3771 u_long subcmd; 3772 struct ifreq *ifr = (struct ifreq *)data; 3773 struct spppreq spr; 3774 3775 /* 3776 * ifr->ifr_data is supposed to point to a struct spppreq. 3777 * Check the cmd word first before attempting to fetch all the 3778 * data. 3779 */ 3780 if ((subcmd = fuword(ifr->ifr_data)) == -1) 3781 return EFAULT; 3782 3783 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 3784 return EFAULT; 3785 3786 switch (subcmd) { 3787 case SPPPIOGDEFS: 3788 if (cmd != SIOCGIFGENERIC) 3789 return EINVAL; 3790 /* 3791 * We copy over the entire current state, but clean 3792 * out some of the stuff we don't wanna pass up. 3793 * Remember, SIOCGIFGENERIC is unprotected, and can be 3794 * called by any user. No need to ever get PAP or 3795 * CHAP secrets back to userland anyway. 3796 */ 3797 bcopy(sp, &spr.defs, sizeof(struct sppp)); 3798 bzero(spr.defs.myauth.secret, AUTHKEYLEN); 3799 bzero(spr.defs.myauth.challenge, AUTHKEYLEN); 3800 bzero(spr.defs.hisauth.secret, AUTHKEYLEN); 3801 bzero(spr.defs.hisauth.challenge, AUTHKEYLEN); 3802 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 3803 3804 case SPPPIOSDEFS: 3805 if (cmd != SIOCSIFGENERIC) 3806 return EINVAL; 3807 /* 3808 * We have a very specific idea of which fields we allow 3809 * being passed back from userland, so to not clobber our 3810 * current state. For one, we only allow setting 3811 * anything if LCP is in dead phase. Once the LCP 3812 * negotiations started, the authentication settings must 3813 * not be changed again. (The administrator can force an 3814 * ifconfig down in order to get LCP back into dead 3815 * phase.) 3816 * 3817 * Also, we only allow for authentication parameters to be 3818 * specified. 3819 * 3820 * XXX Should allow to set or clear pp_flags. 3821 * 3822 * Finally, if the respective authentication protocol to 3823 * be used is set differently than 0, but the secret is 3824 * passed as all zeros, we don't trash the existing secret. 3825 * This allows an administrator to change the system name 3826 * only without clobbering the secret (which he didn't get 3827 * back in a previous SPPPIOGDEFS call). However, the 3828 * secrets are cleared if the authentication protocol is 3829 * reset to 0. 3830 */ 3831 if (sp->pp_phase != PHASE_DEAD) 3832 return EBUSY; 3833 3834 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 3835 spr.defs.myauth.proto != PPP_CHAP) || 3836 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 3837 spr.defs.hisauth.proto != PPP_CHAP)) 3838 return EINVAL; 3839 3840 if (spr.defs.myauth.proto == 0) 3841 /* resetting myauth */ 3842 bzero(&sp->myauth, sizeof sp->myauth); 3843 else { 3844 /* setting/changing myauth */ 3845 sp->myauth.proto = spr.defs.myauth.proto; 3846 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 3847 if (spr.defs.myauth.secret[0] != '\0') 3848 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 3849 AUTHKEYLEN); 3850 } 3851 if (spr.defs.hisauth.proto == 0) 3852 /* resetting hisauth */ 3853 bzero(&sp->hisauth, sizeof sp->hisauth); 3854 else { 3855 /* setting/changing hisauth */ 3856 sp->hisauth.proto = spr.defs.hisauth.proto; 3857 sp->hisauth.flags = spr.defs.hisauth.flags; 3858 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 3859 if (spr.defs.hisauth.secret[0] != '\0') 3860 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 3861 AUTHKEYLEN); 3862 } 3863 break; 3864 3865 default: 3866 return EINVAL; 3867 } 3868 3869 return 0; 3870} 3871 3872static void 3873sppp_phase_network(struct sppp *sp) 3874{ 3875 struct ifnet *ifp = &sp->pp_if; 3876 int i; 3877 u_long mask; 3878 3879 sp->pp_phase = PHASE_NETWORK; 3880 3881 log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit, 3882 sppp_phase_name(sp->pp_phase)); 3883 3884 /* Notify NCPs now. */ 3885 for (i = 0; i < IDX_COUNT; i++) 3886 if ((cps[i])->flags & CP_NCP) 3887 (cps[i])->Open(sp); 3888 3889 /* Send Up events to all NCPs. */ 3890 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 3891 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP)) 3892 (cps[i])->Up(sp); 3893 3894 /* if no NCP is starting, all this was in vain, close down */ 3895 sppp_lcp_check_and_close(sp); 3896} 3897 3898 3899static const char * 3900sppp_cp_type_name(u_char type) 3901{ 3902 static char buf[12]; 3903 switch (type) { 3904 case CONF_REQ: return "conf-req"; 3905 case CONF_ACK: return "conf-ack"; 3906 case CONF_NAK: return "conf-nak"; 3907 case CONF_REJ: return "conf-rej"; 3908 case TERM_REQ: return "term-req"; 3909 case TERM_ACK: return "term-ack"; 3910 case CODE_REJ: return "code-rej"; 3911 case PROTO_REJ: return "proto-rej"; 3912 case ECHO_REQ: return "echo-req"; 3913 case ECHO_REPLY: return "echo-reply"; 3914 case DISC_REQ: return "discard-req"; 3915 } 3916 sprintf (buf, "0x%x", type); 3917 return buf; 3918} 3919 3920static const char * 3921sppp_auth_type_name(u_short proto, u_char type) 3922{ 3923 static char buf[12]; 3924 switch (proto) { 3925 case PPP_CHAP: 3926 switch (type) { 3927 case CHAP_CHALLENGE: return "challenge"; 3928 case CHAP_RESPONSE: return "response"; 3929 case CHAP_SUCCESS: return "success"; 3930 case CHAP_FAILURE: return "failure"; 3931 } 3932 case PPP_PAP: 3933 switch (type) { 3934 case PAP_REQ: return "req"; 3935 case PAP_ACK: return "ack"; 3936 case PAP_NAK: return "nak"; 3937 } 3938 } 3939 sprintf (buf, "0x%x", type); 3940 return buf; 3941} 3942 3943static const char * 3944sppp_lcp_opt_name(u_char opt) 3945{ 3946 static char buf[12]; 3947 switch (opt) { 3948 case LCP_OPT_MRU: return "mru"; 3949 case LCP_OPT_ASYNC_MAP: return "async-map"; 3950 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 3951 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 3952 case LCP_OPT_MAGIC: return "magic"; 3953 case LCP_OPT_PROTO_COMP: return "proto-comp"; 3954 case LCP_OPT_ADDR_COMP: return "addr-comp"; 3955 } 3956 sprintf (buf, "0x%x", opt); 3957 return buf; 3958} 3959 3960static const char * 3961sppp_ipcp_opt_name(u_char opt) 3962{ 3963 static char buf[12]; 3964 switch (opt) { 3965 case IPCP_OPT_ADDRESSES: return "addresses"; 3966 case IPCP_OPT_COMPRESSION: return "compression"; 3967 case IPCP_OPT_ADDRESS: return "address"; 3968 } 3969 sprintf (buf, "0x%x", opt); 3970 return buf; 3971} 3972 3973static const char * 3974sppp_state_name(int state) 3975{ 3976 switch (state) { 3977 case STATE_INITIAL: return "initial"; 3978 case STATE_STARTING: return "starting"; 3979 case STATE_CLOSED: return "closed"; 3980 case STATE_STOPPED: return "stopped"; 3981 case STATE_CLOSING: return "closing"; 3982 case STATE_STOPPING: return "stopping"; 3983 case STATE_REQ_SENT: return "req-sent"; 3984 case STATE_ACK_RCVD: return "ack-rcvd"; 3985 case STATE_ACK_SENT: return "ack-sent"; 3986 case STATE_OPENED: return "opened"; 3987 } 3988 return "illegal"; 3989} 3990 3991static const char * 3992sppp_phase_name(enum ppp_phase phase) 3993{ 3994 switch (phase) { 3995 case PHASE_DEAD: return "dead"; 3996 case PHASE_ESTABLISH: return "establish"; 3997 case PHASE_TERMINATE: return "terminate"; 3998 case PHASE_AUTHENTICATE: return "authenticate"; 3999 case PHASE_NETWORK: return "network"; 4000 } 4001 return "illegal"; 4002} 4003 4004static const char * 4005sppp_proto_name(u_short proto) 4006{ 4007 static char buf[12]; 4008 switch (proto) { 4009 case PPP_LCP: return "lcp"; 4010 case PPP_IPCP: return "ipcp"; 4011 case PPP_PAP: return "pap"; 4012 case PPP_CHAP: return "chap"; 4013 } 4014 sprintf(buf, "0x%x", (unsigned)proto); 4015 return buf; 4016} 4017 4018static void 4019sppp_print_bytes(const u_char *p, u_short len) 4020{ 4021 addlog(" %x", *p++); 4022 while (--len > 0) 4023 addlog("-%x", *p++); 4024} 4025 4026static void 4027sppp_print_string(const char *p, u_short len) 4028{ 4029 u_char c; 4030 4031 while (len-- > 0) { 4032 c = *p++; 4033 /* 4034 * Print only ASCII chars directly. RFC 1994 recommends 4035 * using only them, but we don't rely on it. */ 4036 if (c < ' ' || c > '~') 4037 addlog("\\x%x", c); 4038 else 4039 addlog("%c", c); 4040 } 4041} 4042 4043static const char * 4044sppp_dotted_quad(u_long addr) 4045{ 4046 static char s[16]; 4047 sprintf(s, "%d.%d.%d.%d", 4048 (int)(addr >> 24) & 0xff, 4049 (int)(addr >> 16) & 0xff, 4050 (int)(addr >> 8) & 0xff, 4051 (int)(addr & 0xff)); 4052 return s; 4053} 4054 4055static int 4056sppp_strnlen(u_char *p, int max) 4057{ 4058 int len; 4059 4060 for (len = 0; len < max && *p; ++p) 4061 ++len; 4062 return len; 4063} 4064 4065/* a dummy, used to drop uninteresting events */ 4066static void 4067sppp_null(struct sppp *unused) 4068{ 4069 /* do just nothing */ 4070} 4071/* 4072 * This file is large. Tell emacs to highlight it nevertheless. 4073 * 4074 * Local Variables: 4075 * hilit-auto-highlight-maxout: 120000 4076 * End: 4077 */ 4078