if_spppsubr.c revision 42066
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 1.50 1998/12/26 12:43:26 phk Exp $ 21 */ 22 23#include <sys/param.h> 24 25#if defined(__FreeBSD__) && __FreeBSD__ >= 3 26#include "opt_inet.h" 27#include "opt_ipx.h" 28#endif 29 30#ifdef NetBSD1_3 31# if NetBSD1_3 > 6 32# include "opt_inet.h" 33# include "opt_iso.h" 34# endif 35#endif 36 37#include <sys/systm.h> 38#include <sys/kernel.h> 39#include <sys/sockio.h> 40#include <sys/socket.h> 41#include <sys/syslog.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44 45#if defined (__OpenBSD__) 46#include <sys/md5k.h> 47#else 48#include <sys/md5.h> 49#endif 50 51#include <net/if.h> 52#include <net/netisr.h> 53#include <net/if_types.h> 54 55#if defined(__FreeBSD__) && __FreeBSD__ >= 3 56#include <machine/random.h> 57#endif 58#if defined (__NetBSD__) || defined (__OpenBSD__) 59#include <machine/cpu.h> /* XXX for softnet */ 60#endif 61#include <machine/stdarg.h> 62 63#ifdef INET 64#include <netinet/in.h> 65#include <netinet/in_systm.h> 66#include <netinet/in_var.h> 67#include <netinet/ip.h> 68#include <netinet/tcp.h> 69# if defined (__FreeBSD__) || defined (__OpenBSD__) 70# include <netinet/if_ether.h> 71# else 72# include <net/ethertypes.h> 73# endif 74#else 75# error Huh? sppp without INET? 76#endif 77 78#ifdef IPX 79#include <netipx/ipx.h> 80#include <netipx/ipx_if.h> 81#endif 82 83#ifdef NS 84#include <netns/ns.h> 85#include <netns/ns_if.h> 86#endif 87 88#ifdef ISO 89#include <netiso/argo_debug.h> 90#include <netiso/iso.h> 91#include <netiso/iso_var.h> 92#include <netiso/iso_snpac.h> 93#endif 94 95#include <net/if_sppp.h> 96 97#if defined(__FreeBSD__) && __FreeBSD__ >= 3 98# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle) 99# define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2) 100#else 101# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg) 102# define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2) 103#endif 104#define MAXALIVECNT 3 /* max. alive packets */ 105 106/* 107 * Interface flags that can be set in an ifconfig command. 108 * 109 * Setting link0 will make the link passive, i.e. it will be marked 110 * as being administrative openable, but won't be opened to begin 111 * with. Incoming calls will be answered, or subsequent calls with 112 * -link1 will cause the administrative open of the LCP layer. 113 * 114 * Setting link1 will cause the link to auto-dial only as packets 115 * arrive to be sent. 116 * 117 * Setting IFF_DEBUG will syslog the option negotiation and state 118 * transitions at level kern.debug. Note: all logs consistently look 119 * like 120 * 121 * <if-name><unit>: <proto-name> <additional info...> 122 * 123 * with <if-name><unit> being something like "bppp0", and <proto-name> 124 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 125 */ 126 127#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 128#define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 129 130#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 131#define PPP_UI 0x03 /* Unnumbered Information */ 132#define PPP_IP 0x0021 /* Internet Protocol */ 133#define PPP_ISO 0x0023 /* ISO OSI Protocol */ 134#define PPP_XNS 0x0025 /* Xerox NS Protocol */ 135#define PPP_IPX 0x002b /* Novell IPX Protocol */ 136#define PPP_LCP 0xc021 /* Link Control Protocol */ 137#define PPP_PAP 0xc023 /* Password Authentication Protocol */ 138#define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */ 139#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 140 141#define CONF_REQ 1 /* PPP configure request */ 142#define CONF_ACK 2 /* PPP configure acknowledge */ 143#define CONF_NAK 3 /* PPP configure negative ack */ 144#define CONF_REJ 4 /* PPP configure reject */ 145#define TERM_REQ 5 /* PPP terminate request */ 146#define TERM_ACK 6 /* PPP terminate acknowledge */ 147#define CODE_REJ 7 /* PPP code reject */ 148#define PROTO_REJ 8 /* PPP protocol reject */ 149#define ECHO_REQ 9 /* PPP echo request */ 150#define ECHO_REPLY 10 /* PPP echo reply */ 151#define DISC_REQ 11 /* PPP discard request */ 152 153#define LCP_OPT_MRU 1 /* maximum receive unit */ 154#define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 155#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 156#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 157#define LCP_OPT_MAGIC 5 /* magic number */ 158#define LCP_OPT_RESERVED 6 /* reserved */ 159#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 160#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 161 162#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 163#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 164#define IPCP_OPT_ADDRESS 3 /* local IP address */ 165 166#define PAP_REQ 1 /* PAP name/password request */ 167#define PAP_ACK 2 /* PAP acknowledge */ 168#define PAP_NAK 3 /* PAP fail */ 169 170#define CHAP_CHALLENGE 1 /* CHAP challenge request */ 171#define CHAP_RESPONSE 2 /* CHAP challenge response */ 172#define CHAP_SUCCESS 3 /* CHAP response ok */ 173#define CHAP_FAILURE 4 /* CHAP response failed */ 174 175#define CHAP_MD5 5 /* hash algorithm - MD5 */ 176 177#define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 178#define CISCO_UNICAST 0x0f /* Cisco unicast address */ 179#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 180#define CISCO_ADDR_REQ 0 /* Cisco address request */ 181#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 182#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 183 184/* states are named and numbered according to RFC 1661 */ 185#define STATE_INITIAL 0 186#define STATE_STARTING 1 187#define STATE_CLOSED 2 188#define STATE_STOPPED 3 189#define STATE_CLOSING 4 190#define STATE_STOPPING 5 191#define STATE_REQ_SENT 6 192#define STATE_ACK_RCVD 7 193#define STATE_ACK_SENT 8 194#define STATE_OPENED 9 195 196struct ppp_header { 197 u_char address; 198 u_char control; 199 u_short protocol; 200}; 201#define PPP_HEADER_LEN sizeof (struct ppp_header) 202 203struct lcp_header { 204 u_char type; 205 u_char ident; 206 u_short len; 207}; 208#define LCP_HEADER_LEN sizeof (struct lcp_header) 209 210struct cisco_packet { 211 u_long type; 212 u_long par1; 213 u_long par2; 214 u_short rel; 215 u_short time0; 216 u_short time1; 217}; 218#define CISCO_PACKET_LEN 18 219 220/* 221 * We follow the spelling and capitalization of RFC 1661 here, to make 222 * it easier comparing with the standard. Please refer to this RFC in 223 * case you can't make sense out of these abbreviation; it will also 224 * explain the semantics related to the various events and actions. 225 */ 226struct cp { 227 u_short proto; /* PPP control protocol number */ 228 u_char protoidx; /* index into state table in struct sppp */ 229 u_char flags; 230#define CP_LCP 0x01 /* this is the LCP */ 231#define CP_AUTH 0x02 /* this is an authentication protocol */ 232#define CP_NCP 0x04 /* this is a NCP */ 233#define CP_QUAL 0x08 /* this is a quality reporting protocol */ 234 const char *name; /* name of this control protocol */ 235 /* event handlers */ 236 void (*Up)(struct sppp *sp); 237 void (*Down)(struct sppp *sp); 238 void (*Open)(struct sppp *sp); 239 void (*Close)(struct sppp *sp); 240 void (*TO)(void *sp); 241 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 242 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 243 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 244 /* actions */ 245 void (*tlu)(struct sppp *sp); 246 void (*tld)(struct sppp *sp); 247 void (*tls)(struct sppp *sp); 248 void (*tlf)(struct sppp *sp); 249 void (*scr)(struct sppp *sp); 250}; 251 252static struct sppp *spppq; 253#if defined(__FreeBSD__) && __FreeBSD__ >= 3 254static struct callout_handle keepalive_ch; 255#endif 256 257#if defined(__FreeBSD__) && __FreeBSD__ >= 3 258#define SPP_FMT "%s%d: " 259#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 260#else 261#define SPP_FMT "%s: " 262#define SPP_ARGS(ifp) (ifp)->if_xname 263#endif 264 265/* 266 * The following disgusting hack gets around the problem that IP TOS 267 * can't be set yet. We want to put "interactive" traffic on a high 268 * priority queue. To decide if traffic is interactive, we check that 269 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 270 * 271 * XXX is this really still necessary? - joerg - 272 */ 273static u_short interactive_ports[8] = { 274 0, 513, 0, 0, 275 0, 21, 0, 23, 276}; 277#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 278 279/* almost every function needs these */ 280#define STDDCL \ 281 struct ifnet *ifp = &sp->pp_if; \ 282 int debug = ifp->if_flags & IFF_DEBUG 283 284static int sppp_output(struct ifnet *ifp, struct mbuf *m, 285 struct sockaddr *dst, struct rtentry *rt); 286 287static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 288static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 289 290static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 291 struct mbuf *m); 292static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 293 u_char ident, u_short len, void *data); 294#ifdef notyet 295static void sppp_cp_timeout(void *arg); 296#endif 297static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 298 int newstate); 299static void sppp_auth_send(const struct cp *cp, 300 struct sppp *sp, u_char type, u_char id, 301 ...); 302 303static void sppp_up_event(const struct cp *cp, struct sppp *sp); 304static void sppp_down_event(const struct cp *cp, struct sppp *sp); 305static void sppp_open_event(const struct cp *cp, struct sppp *sp); 306static void sppp_close_event(const struct cp *cp, struct sppp *sp); 307static void sppp_to_event(const struct cp *cp, struct sppp *sp); 308 309static void sppp_null(struct sppp *sp); 310 311static void sppp_lcp_init(struct sppp *sp); 312static void sppp_lcp_up(struct sppp *sp); 313static void sppp_lcp_down(struct sppp *sp); 314static void sppp_lcp_open(struct sppp *sp); 315static void sppp_lcp_close(struct sppp *sp); 316static void sppp_lcp_TO(void *sp); 317static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 318static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 319static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 320static void sppp_lcp_tlu(struct sppp *sp); 321static void sppp_lcp_tld(struct sppp *sp); 322static void sppp_lcp_tls(struct sppp *sp); 323static void sppp_lcp_tlf(struct sppp *sp); 324static void sppp_lcp_scr(struct sppp *sp); 325static void sppp_lcp_check_and_close(struct sppp *sp); 326static int sppp_ncp_check(struct sppp *sp); 327 328static void sppp_ipcp_init(struct sppp *sp); 329static void sppp_ipcp_up(struct sppp *sp); 330static void sppp_ipcp_down(struct sppp *sp); 331static void sppp_ipcp_open(struct sppp *sp); 332static void sppp_ipcp_close(struct sppp *sp); 333static void sppp_ipcp_TO(void *sp); 334static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 335static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 336static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 337static void sppp_ipcp_tlu(struct sppp *sp); 338static void sppp_ipcp_tld(struct sppp *sp); 339static void sppp_ipcp_tls(struct sppp *sp); 340static void sppp_ipcp_tlf(struct sppp *sp); 341static void sppp_ipcp_scr(struct sppp *sp); 342 343static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 344static void sppp_pap_init(struct sppp *sp); 345static void sppp_pap_open(struct sppp *sp); 346static void sppp_pap_close(struct sppp *sp); 347static void sppp_pap_TO(void *sp); 348static void sppp_pap_my_TO(void *sp); 349static void sppp_pap_tlu(struct sppp *sp); 350static void sppp_pap_tld(struct sppp *sp); 351static void sppp_pap_scr(struct sppp *sp); 352 353static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 354static void sppp_chap_init(struct sppp *sp); 355static void sppp_chap_open(struct sppp *sp); 356static void sppp_chap_close(struct sppp *sp); 357static void sppp_chap_TO(void *sp); 358static void sppp_chap_tlu(struct sppp *sp); 359static void sppp_chap_tld(struct sppp *sp); 360static void sppp_chap_scr(struct sppp *sp); 361 362static const char *sppp_auth_type_name(u_short proto, u_char type); 363static const char *sppp_cp_type_name(u_char type); 364static const char *sppp_dotted_quad(u_long addr); 365static const char *sppp_ipcp_opt_name(u_char opt); 366static const char *sppp_lcp_opt_name(u_char opt); 367static const char *sppp_phase_name(enum ppp_phase phase); 368static const char *sppp_proto_name(u_short proto); 369static const char *sppp_state_name(int state); 370static int sppp_params(struct sppp *sp, u_long cmd, void *data); 371static int sppp_strnlen(u_char *p, int max); 372static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, 373 u_long *srcmask); 374static void sppp_keepalive(void *dummy); 375static void sppp_phase_network(struct sppp *sp); 376static void sppp_print_bytes(const u_char *p, u_short len); 377static void sppp_print_string(const char *p, u_short len); 378static void sppp_qflush(struct ifqueue *ifq); 379static void sppp_set_ip_addr(struct sppp *sp, u_long src); 380 381/* our control protocol descriptors */ 382static const struct cp lcp = { 383 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 384 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 385 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 386 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 387 sppp_lcp_scr 388}; 389 390static const struct cp ipcp = { 391 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 392 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 393 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 394 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 395 sppp_ipcp_scr 396}; 397 398static const struct cp pap = { 399 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 400 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 401 sppp_pap_TO, 0, 0, 0, 402 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 403 sppp_pap_scr 404}; 405 406static const struct cp chap = { 407 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 408 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 409 sppp_chap_TO, 0, 0, 0, 410 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 411 sppp_chap_scr 412}; 413 414static const struct cp *cps[IDX_COUNT] = { 415 &lcp, /* IDX_LCP */ 416 &ipcp, /* IDX_IPCP */ 417 &pap, /* IDX_PAP */ 418 &chap, /* IDX_CHAP */ 419}; 420 421 422 /* 423 * Exported functions, comprising our interface to the lower layer. 424 */ 425 426/* 427 * Process the received packet. 428 */ 429void 430sppp_input(struct ifnet *ifp, struct mbuf *m) 431{ 432 struct ppp_header *h; 433 struct ifqueue *inq = 0; 434 int s; 435 struct sppp *sp = (struct sppp *)ifp; 436 int debug = ifp->if_flags & IFF_DEBUG; 437 438 if (ifp->if_flags & IFF_UP) 439 /* Count received bytes, add FCS and one flag */ 440 ifp->if_ibytes += m->m_pkthdr.len + 3; 441 442 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 443 /* Too small packet, drop it. */ 444 if (debug) 445 log(LOG_DEBUG, 446 SPP_FMT "input packet is too small, %d bytes\n", 447 SPP_ARGS(ifp), m->m_pkthdr.len); 448 drop: 449 ++ifp->if_ierrors; 450 ++ifp->if_iqdrops; 451 m_freem (m); 452 return; 453 } 454 455 /* Get PPP header. */ 456 h = mtod (m, struct ppp_header*); 457 m_adj (m, PPP_HEADER_LEN); 458 459 switch (h->address) { 460 case PPP_ALLSTATIONS: 461 if (h->control != PPP_UI) 462 goto invalid; 463 if (sp->pp_flags & PP_CISCO) { 464 if (debug) 465 log(LOG_DEBUG, 466 SPP_FMT "PPP packet in Cisco mode " 467 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 468 SPP_ARGS(ifp), 469 h->address, h->control, ntohs(h->protocol)); 470 goto drop; 471 } 472 switch (ntohs (h->protocol)) { 473 default: 474 if (sp->state[IDX_LCP] == STATE_OPENED) 475 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 476 ++sp->pp_seq, m->m_pkthdr.len + 2, 477 &h->protocol); 478 if (debug) 479 log(LOG_DEBUG, 480 SPP_FMT "invalid input protocol " 481 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 482 SPP_ARGS(ifp), 483 h->address, h->control, ntohs(h->protocol)); 484 ++ifp->if_noproto; 485 goto drop; 486 case PPP_LCP: 487 sppp_cp_input(&lcp, sp, m); 488 m_freem (m); 489 return; 490 case PPP_PAP: 491 if (sp->pp_phase >= PHASE_AUTHENTICATE) 492 sppp_pap_input(sp, m); 493 m_freem (m); 494 return; 495 case PPP_CHAP: 496 if (sp->pp_phase >= PHASE_AUTHENTICATE) 497 sppp_chap_input(sp, m); 498 m_freem (m); 499 return; 500#ifdef INET 501 case PPP_IPCP: 502 if (sp->pp_phase == PHASE_NETWORK) 503 sppp_cp_input(&ipcp, sp, m); 504 m_freem (m); 505 return; 506 case PPP_IP: 507 if (sp->state[IDX_IPCP] == STATE_OPENED) { 508 schednetisr (NETISR_IP); 509 inq = &ipintrq; 510 } 511 break; 512#endif 513#ifdef IPX 514 case PPP_IPX: 515 /* IPX IPXCP not implemented yet */ 516 if (sp->pp_phase == PHASE_NETWORK) { 517 schednetisr (NETISR_IPX); 518 inq = &ipxintrq; 519 } 520 break; 521#endif 522#ifdef NS 523 case PPP_XNS: 524 /* XNS IDPCP not implemented yet */ 525 if (sp->pp_phase == PHASE_NETWORK) { 526 schednetisr (NETISR_NS); 527 inq = &nsintrq; 528 } 529 break; 530#endif 531#ifdef ISO 532 case PPP_ISO: 533 /* OSI NLCP not implemented yet */ 534 if (sp->pp_phase == PHASE_NETWORK) { 535 schednetisr (NETISR_ISO); 536 inq = &clnlintrq; 537 } 538 break; 539#endif 540 } 541 break; 542 case CISCO_MULTICAST: 543 case CISCO_UNICAST: 544 /* Don't check the control field here (RFC 1547). */ 545 if (! (sp->pp_flags & PP_CISCO)) { 546 if (debug) 547 log(LOG_DEBUG, 548 SPP_FMT "Cisco packet in PPP mode " 549 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 550 SPP_ARGS(ifp), 551 h->address, h->control, ntohs(h->protocol)); 552 goto drop; 553 } 554 switch (ntohs (h->protocol)) { 555 default: 556 ++ifp->if_noproto; 557 goto invalid; 558 case CISCO_KEEPALIVE: 559 sppp_cisco_input ((struct sppp*) ifp, m); 560 m_freem (m); 561 return; 562#ifdef INET 563 case ETHERTYPE_IP: 564 schednetisr (NETISR_IP); 565 inq = &ipintrq; 566 break; 567#endif 568#ifdef IPX 569 case ETHERTYPE_IPX: 570 schednetisr (NETISR_IPX); 571 inq = &ipxintrq; 572 break; 573#endif 574#ifdef NS 575 case ETHERTYPE_NS: 576 schednetisr (NETISR_NS); 577 inq = &nsintrq; 578 break; 579#endif 580 } 581 break; 582 default: /* Invalid PPP packet. */ 583 invalid: 584 if (debug) 585 log(LOG_DEBUG, 586 SPP_FMT "invalid input packet " 587 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 588 SPP_ARGS(ifp), 589 h->address, h->control, ntohs(h->protocol)); 590 goto drop; 591 } 592 593 if (! (ifp->if_flags & IFF_UP) || ! inq) 594 goto drop; 595 596 /* Check queue. */ 597 s = splimp(); 598 if (IF_QFULL (inq)) { 599 /* Queue overflow. */ 600 IF_DROP(inq); 601 splx(s); 602 if (debug) 603 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 604 SPP_ARGS(ifp)); 605 goto drop; 606 } 607 IF_ENQUEUE(inq, m); 608 splx(s); 609} 610 611/* 612 * Enqueue transmit packet. 613 */ 614static int 615sppp_output(struct ifnet *ifp, struct mbuf *m, 616 struct sockaddr *dst, struct rtentry *rt) 617{ 618 struct sppp *sp = (struct sppp*) ifp; 619 struct ppp_header *h; 620 struct ifqueue *ifq; 621 int s, rv = 0; 622 int debug = ifp->if_flags & IFF_DEBUG; 623 624 s = splimp(); 625 626 if ((ifp->if_flags & IFF_UP) == 0 || 627 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 628 m_freem (m); 629 splx (s); 630 return (ENETDOWN); 631 } 632 633 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 634 /* 635 * Interface is not yet running, but auto-dial. Need 636 * to start LCP for it. 637 */ 638 ifp->if_flags |= IFF_RUNNING; 639 splx(s); 640 lcp.Open(sp); 641 s = splimp(); 642 } 643 644 ifq = &ifp->if_snd; 645#ifdef INET 646 /* 647 * Put low delay, telnet, rlogin and ftp control packets 648 * in front of the queue. 649 */ 650 if (dst->sa_family == AF_INET) { 651 /* XXX Check mbuf length here? */ 652 struct ip *ip = mtod (m, struct ip*); 653 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 654 655 if (IF_QFULL (&sp->pp_fastq)) 656 ; 657 else if (ip->ip_tos & IPTOS_LOWDELAY) 658 ifq = &sp->pp_fastq; 659 else if (m->m_len < sizeof *ip + sizeof *tcp) 660 ; 661 else if (ip->ip_p != IPPROTO_TCP) 662 ; 663 else if (INTERACTIVE (ntohs (tcp->th_sport))) 664 ifq = &sp->pp_fastq; 665 else if (INTERACTIVE (ntohs (tcp->th_dport))) 666 ifq = &sp->pp_fastq; 667 } 668#endif 669 670 /* 671 * Prepend general data packet PPP header. For now, IP only. 672 */ 673 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 674 if (! m) { 675 if (debug) 676 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 677 SPP_ARGS(ifp)); 678 ++ifp->if_oerrors; 679 splx (s); 680 return (ENOBUFS); 681 } 682 /* 683 * May want to check size of packet 684 * (albeit due to the implementation it's always enough) 685 */ 686 h = mtod (m, struct ppp_header*); 687 if (sp->pp_flags & PP_CISCO) { 688 h->address = CISCO_UNICAST; /* unicast address */ 689 h->control = 0; 690 } else { 691 h->address = PPP_ALLSTATIONS; /* broadcast address */ 692 h->control = PPP_UI; /* Unnumbered Info */ 693 } 694 695 switch (dst->sa_family) { 696#ifdef INET 697 case AF_INET: /* Internet Protocol */ 698 if (sp->pp_flags & PP_CISCO) 699 h->protocol = htons (ETHERTYPE_IP); 700 else { 701 /* 702 * Don't choke with an ENETDOWN early. It's 703 * possible that we just started dialing out, 704 * so don't drop the packet immediately. If 705 * we notice that we run out of buffer space 706 * below, we will however remember that we are 707 * not ready to carry IP packets, and return 708 * ENETDOWN, as opposed to ENOBUFS. 709 */ 710 h->protocol = htons(PPP_IP); 711 if (sp->state[IDX_IPCP] != STATE_OPENED) 712 rv = ENETDOWN; 713 } 714 break; 715#endif 716#ifdef NS 717 case AF_NS: /* Xerox NS Protocol */ 718 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 719 ETHERTYPE_NS : PPP_XNS); 720 break; 721#endif 722#ifdef IPX 723 case AF_IPX: /* Novell IPX Protocol */ 724 h->protocol = htons ((sp->pp_flags & PP_CISCO) ? 725 ETHERTYPE_IPX : PPP_IPX); 726 break; 727#endif 728#ifdef ISO 729 case AF_ISO: /* ISO OSI Protocol */ 730 if (sp->pp_flags & PP_CISCO) 731 goto nosupport; 732 h->protocol = htons (PPP_ISO); 733 break; 734nosupport: 735#endif 736 default: 737 m_freem (m); 738 ++ifp->if_oerrors; 739 splx (s); 740 return (EAFNOSUPPORT); 741 } 742 743 /* 744 * Queue message on interface, and start output if interface 745 * not yet active. 746 */ 747 if (IF_QFULL (ifq)) { 748 IF_DROP (&ifp->if_snd); 749 m_freem (m); 750 ++ifp->if_oerrors; 751 splx (s); 752 return (rv? rv: ENOBUFS); 753 } 754 IF_ENQUEUE (ifq, m); 755 if (! (ifp->if_flags & IFF_OACTIVE)) 756 (*ifp->if_start) (ifp); 757 758 /* 759 * Count output packets and bytes. 760 * The packet length includes header, FCS and 1 flag, 761 * according to RFC 1333. 762 */ 763 ifp->if_obytes += m->m_pkthdr.len + 3; 764 splx (s); 765 return (0); 766} 767 768void 769sppp_attach(struct ifnet *ifp) 770{ 771 struct sppp *sp = (struct sppp*) ifp; 772 773 /* Initialize keepalive handler. */ 774 if (! spppq) 775 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 776 777 /* Insert new entry into the keepalive list. */ 778 sp->pp_next = spppq; 779 spppq = sp; 780 781 sp->pp_if.if_mtu = PP_MTU; 782 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 783 sp->pp_if.if_type = IFT_PPP; 784 sp->pp_if.if_output = sppp_output; 785 sp->pp_flags = PP_KEEPALIVE; 786 sp->pp_fastq.ifq_maxlen = 32; 787 sp->pp_cpq.ifq_maxlen = 20; 788 sp->pp_loopcnt = 0; 789 sp->pp_alivecnt = 0; 790 sp->pp_seq = 0; 791 sp->pp_rseq = 0; 792 sp->pp_phase = PHASE_DEAD; 793 sp->pp_up = lcp.Up; 794 sp->pp_down = lcp.Down; 795 796 sppp_lcp_init(sp); 797 sppp_ipcp_init(sp); 798 sppp_pap_init(sp); 799 sppp_chap_init(sp); 800} 801 802void 803sppp_detach(struct ifnet *ifp) 804{ 805 struct sppp **q, *p, *sp = (struct sppp*) ifp; 806 int i; 807 808 /* Remove the entry from the keepalive list. */ 809 for (q = &spppq; (p = *q); q = &p->pp_next) 810 if (p == sp) { 811 *q = p->pp_next; 812 break; 813 } 814 815 /* Stop keepalive handler. */ 816 if (! spppq) 817 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch); 818 819 for (i = 0; i < IDX_COUNT; i++) 820 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]); 821 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 822} 823 824/* 825 * Flush the interface output queue. 826 */ 827void 828sppp_flush(struct ifnet *ifp) 829{ 830 struct sppp *sp = (struct sppp*) ifp; 831 832 sppp_qflush (&sp->pp_if.if_snd); 833 sppp_qflush (&sp->pp_fastq); 834 sppp_qflush (&sp->pp_cpq); 835} 836 837/* 838 * Check if the output queue is empty. 839 */ 840int 841sppp_isempty(struct ifnet *ifp) 842{ 843 struct sppp *sp = (struct sppp*) ifp; 844 int empty, s; 845 846 s = splimp(); 847 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 848 !sp->pp_if.if_snd.ifq_head; 849 splx(s); 850 return (empty); 851} 852 853/* 854 * Get next packet to send. 855 */ 856struct mbuf * 857sppp_dequeue(struct ifnet *ifp) 858{ 859 struct sppp *sp = (struct sppp*) ifp; 860 struct mbuf *m; 861 int s; 862 863 s = splimp(); 864 /* 865 * Process only the control protocol queue until we have at 866 * least one NCP open. 867 * 868 * Do always serve all three queues in Cisco mode. 869 */ 870 IF_DEQUEUE(&sp->pp_cpq, m); 871 if (m == NULL && 872 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 873 IF_DEQUEUE(&sp->pp_fastq, m); 874 if (m == NULL) 875 IF_DEQUEUE (&sp->pp_if.if_snd, m); 876 } 877 splx(s); 878 return m; 879} 880 881/* 882 * Pick the next packet, do not remove it from the queue. 883 */ 884struct mbuf * 885sppp_pick(struct ifnet *ifp) 886{ 887 struct sppp *sp = (struct sppp*)ifp; 888 struct mbuf *m; 889 int s; 890 891 s= splimp (); 892 893 m = sp->pp_cpq.ifq_head; 894 if (m == NULL && 895 (sp->pp_phase == PHASE_NETWORK || 896 (sp->pp_flags & PP_CISCO) != 0)) 897 if ((m = sp->pp_fastq.ifq_head) == NULL) 898 m = sp->pp_if.if_snd.ifq_head; 899 splx (s); 900 return (m); 901} 902 903/* 904 * Process an ioctl request. Called on low priority level. 905 */ 906int 907sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 908{ 909 struct ifreq *ifr = (struct ifreq*) data; 910 struct sppp *sp = (struct sppp*) ifp; 911 int s, rv, going_up, going_down, newmode; 912 913 s = splimp(); 914 rv = 0; 915 switch (cmd) { 916 case SIOCAIFADDR: 917 case SIOCSIFDSTADDR: 918 break; 919 920 case SIOCSIFADDR: 921 if_up(ifp); 922 /* fall through... */ 923 924 case SIOCSIFFLAGS: 925 going_up = ifp->if_flags & IFF_UP && 926 (ifp->if_flags & IFF_RUNNING) == 0; 927 going_down = (ifp->if_flags & IFF_UP) == 0 && 928 ifp->if_flags & IFF_RUNNING; 929 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 930 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 931 /* sanity */ 932 newmode = IFF_PASSIVE; 933 ifp->if_flags &= ~IFF_AUTO; 934 } 935 936 if (going_up || going_down) 937 lcp.Close(sp); 938 if (going_up && newmode == 0) { 939 /* neither auto-dial nor passive */ 940 ifp->if_flags |= IFF_RUNNING; 941 if (!(sp->pp_flags & PP_CISCO)) 942 lcp.Open(sp); 943 } else if (going_down) { 944 sppp_flush(ifp); 945 ifp->if_flags &= ~IFF_RUNNING; 946 } 947 948 break; 949 950#ifdef SIOCSIFMTU 951#ifndef ifr_mtu 952#define ifr_mtu ifr_metric 953#endif 954 case SIOCSIFMTU: 955 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 956 return (EINVAL); 957 ifp->if_mtu = ifr->ifr_mtu; 958 break; 959#endif 960#ifdef SLIOCSETMTU 961 case SLIOCSETMTU: 962 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 963 return (EINVAL); 964 ifp->if_mtu = *(short*)data; 965 break; 966#endif 967#ifdef SIOCGIFMTU 968 case SIOCGIFMTU: 969 ifr->ifr_mtu = ifp->if_mtu; 970 break; 971#endif 972#ifdef SLIOCGETMTU 973 case SLIOCGETMTU: 974 *(short*)data = ifp->if_mtu; 975 break; 976#endif 977 case SIOCADDMULTI: 978 case SIOCDELMULTI: 979 break; 980 981 case SIOCGIFGENERIC: 982 case SIOCSIFGENERIC: 983 rv = sppp_params(sp, cmd, data); 984 break; 985 986 default: 987 rv = ENOTTY; 988 } 989 splx(s); 990 return rv; 991} 992 993 994 /* 995 * Cisco framing implementation. 996 */ 997 998/* 999 * Handle incoming Cisco keepalive protocol packets. 1000 */ 1001static void 1002sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1003{ 1004 STDDCL; 1005 struct cisco_packet *h; 1006 u_long me, mymask; 1007 1008 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1009 if (debug) 1010 log(LOG_DEBUG, 1011 SPP_FMT "cisco invalid packet length: %d bytes\n", 1012 SPP_ARGS(ifp), m->m_pkthdr.len); 1013 return; 1014 } 1015 h = mtod (m, struct cisco_packet*); 1016 if (debug) 1017 log(LOG_DEBUG, 1018 SPP_FMT "cisco input: %d bytes " 1019 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1020 SPP_ARGS(ifp), m->m_pkthdr.len, 1021 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel, 1022 (u_int)h->time0, (u_int)h->time1); 1023 switch (ntohl (h->type)) { 1024 default: 1025 if (debug) 1026 addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n", 1027 SPP_ARGS(ifp), (u_long)ntohl (h->type)); 1028 break; 1029 case CISCO_ADDR_REPLY: 1030 /* Reply on address request, ignore */ 1031 break; 1032 case CISCO_KEEPALIVE_REQ: 1033 sp->pp_alivecnt = 0; 1034 sp->pp_rseq = ntohl (h->par1); 1035 if (sp->pp_seq == sp->pp_rseq) { 1036 /* Local and remote sequence numbers are equal. 1037 * Probably, the line is in loopback mode. */ 1038 if (sp->pp_loopcnt >= MAXALIVECNT) { 1039 printf (SPP_FMT "loopback\n", 1040 SPP_ARGS(ifp)); 1041 sp->pp_loopcnt = 0; 1042 if (ifp->if_flags & IFF_UP) { 1043 if_down (ifp); 1044 sppp_qflush (&sp->pp_cpq); 1045 } 1046 } 1047 ++sp->pp_loopcnt; 1048 1049 /* Generate new local sequence number */ 1050#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1051 sp->pp_seq = random(); 1052#else 1053 sp->pp_seq ^= time.tv_sec ^ time.tv_usec; 1054#endif 1055 break; 1056 } 1057 sp->pp_loopcnt = 0; 1058 if (! (ifp->if_flags & IFF_UP) && 1059 (ifp->if_flags & IFF_RUNNING)) { 1060 if_up(ifp); 1061 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1062 } 1063 break; 1064 case CISCO_ADDR_REQ: 1065 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1066 if (me != 0L) 1067 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1068 break; 1069 } 1070} 1071 1072/* 1073 * Send Cisco keepalive packet. 1074 */ 1075static void 1076sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 1077{ 1078 STDDCL; 1079 struct ppp_header *h; 1080 struct cisco_packet *ch; 1081 struct mbuf *m; 1082#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1083 struct timeval tv; 1084#else 1085 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 1086#endif 1087 1088#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1089 getmicrouptime(&tv); 1090#endif 1091 1092 MGETHDR (m, M_DONTWAIT, MT_DATA); 1093 if (! m) 1094 return; 1095 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1096 m->m_pkthdr.rcvif = 0; 1097 1098 h = mtod (m, struct ppp_header*); 1099 h->address = CISCO_MULTICAST; 1100 h->control = 0; 1101 h->protocol = htons (CISCO_KEEPALIVE); 1102 1103 ch = (struct cisco_packet*) (h + 1); 1104 ch->type = htonl (type); 1105 ch->par1 = htonl (par1); 1106 ch->par2 = htonl (par2); 1107 ch->rel = -1; 1108 1109#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1110 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1111 ch->time1 = htons ((u_short) tv.tv_sec); 1112#else 1113 ch->time0 = htons ((u_short) (t >> 16)); 1114 ch->time1 = htons ((u_short) t); 1115#endif 1116 1117 if (debug) 1118 log(LOG_DEBUG, 1119 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1120 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1, 1121 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1); 1122 1123 if (IF_QFULL (&sp->pp_cpq)) { 1124 IF_DROP (&sp->pp_fastq); 1125 IF_DROP (&ifp->if_snd); 1126 m_freem (m); 1127 } else 1128 IF_ENQUEUE (&sp->pp_cpq, m); 1129 if (! (ifp->if_flags & IFF_OACTIVE)) 1130 (*ifp->if_start) (ifp); 1131 ifp->if_obytes += m->m_pkthdr.len + 3; 1132} 1133 1134 /* 1135 * PPP protocol implementation. 1136 */ 1137 1138/* 1139 * Send PPP control protocol packet. 1140 */ 1141static void 1142sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1143 u_char ident, u_short len, void *data) 1144{ 1145 STDDCL; 1146 struct ppp_header *h; 1147 struct lcp_header *lh; 1148 struct mbuf *m; 1149 1150 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 1151 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 1152 MGETHDR (m, M_DONTWAIT, MT_DATA); 1153 if (! m) 1154 return; 1155 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 1156 m->m_pkthdr.rcvif = 0; 1157 1158 h = mtod (m, struct ppp_header*); 1159 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1160 h->control = PPP_UI; /* Unnumbered Info */ 1161 h->protocol = htons (proto); /* Link Control Protocol */ 1162 1163 lh = (struct lcp_header*) (h + 1); 1164 lh->type = type; 1165 lh->ident = ident; 1166 lh->len = htons (LCP_HEADER_LEN + len); 1167 if (len) 1168 bcopy (data, lh+1, len); 1169 1170 if (debug) { 1171 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1172 SPP_ARGS(ifp), 1173 sppp_proto_name(proto), 1174 sppp_cp_type_name (lh->type), lh->ident, 1175 ntohs (lh->len)); 1176 if (len) 1177 sppp_print_bytes ((u_char*) (lh+1), len); 1178 addlog(">\n"); 1179 } 1180 if (IF_QFULL (&sp->pp_cpq)) { 1181 IF_DROP (&sp->pp_fastq); 1182 IF_DROP (&ifp->if_snd); 1183 m_freem (m); 1184 ++ifp->if_oerrors; 1185 } else 1186 IF_ENQUEUE (&sp->pp_cpq, m); 1187 if (! (ifp->if_flags & IFF_OACTIVE)) 1188 (*ifp->if_start) (ifp); 1189 ifp->if_obytes += m->m_pkthdr.len + 3; 1190} 1191 1192/* 1193 * Handle incoming PPP control protocol packets. 1194 */ 1195static void 1196sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1197{ 1198 STDDCL; 1199 struct lcp_header *h; 1200 int len = m->m_pkthdr.len; 1201 int rv; 1202 u_char *p; 1203 1204 if (len < 4) { 1205 if (debug) 1206 log(LOG_DEBUG, 1207 SPP_FMT "%s invalid packet length: %d bytes\n", 1208 SPP_ARGS(ifp), cp->name, len); 1209 return; 1210 } 1211 h = mtod (m, struct lcp_header*); 1212 if (debug) { 1213 log(LOG_DEBUG, 1214 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1215 SPP_ARGS(ifp), cp->name, 1216 sppp_state_name(sp->state[cp->protoidx]), 1217 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1218 if (len > 4) 1219 sppp_print_bytes ((u_char*) (h+1), len-4); 1220 addlog(">\n"); 1221 } 1222 if (len > ntohs (h->len)) 1223 len = ntohs (h->len); 1224 p = (u_char *)(h + 1); 1225 switch (h->type) { 1226 case CONF_REQ: 1227 if (len < 4) { 1228 if (debug) 1229 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1230 SPP_ARGS(ifp), cp->name, 1231 len); 1232 ++ifp->if_ierrors; 1233 break; 1234 } 1235 /* handle states where RCR doesn't get a SCA/SCN */ 1236 switch (sp->state[cp->protoidx]) { 1237 case STATE_CLOSING: 1238 case STATE_STOPPING: 1239 return; 1240 case STATE_CLOSED: 1241 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1242 0, 0); 1243 return; 1244 } 1245 rv = (cp->RCR)(sp, h, len); 1246 switch (sp->state[cp->protoidx]) { 1247 case STATE_OPENED: 1248 (cp->tld)(sp); 1249 (cp->scr)(sp); 1250 /* fall through... */ 1251 case STATE_ACK_SENT: 1252 case STATE_REQ_SENT: 1253 sppp_cp_change_state(cp, sp, rv? 1254 STATE_ACK_SENT: STATE_REQ_SENT); 1255 break; 1256 case STATE_STOPPED: 1257 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1258 (cp->scr)(sp); 1259 sppp_cp_change_state(cp, sp, rv? 1260 STATE_ACK_SENT: STATE_REQ_SENT); 1261 break; 1262 case STATE_ACK_RCVD: 1263 if (rv) { 1264 sppp_cp_change_state(cp, sp, STATE_OPENED); 1265 if (debug) 1266 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1267 SPP_ARGS(ifp), 1268 cp->name); 1269 (cp->tlu)(sp); 1270 } else 1271 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1272 break; 1273 default: 1274 printf(SPP_FMT "%s illegal %s in state %s\n", 1275 SPP_ARGS(ifp), cp->name, 1276 sppp_cp_type_name(h->type), 1277 sppp_state_name(sp->state[cp->protoidx])); 1278 ++ifp->if_ierrors; 1279 } 1280 break; 1281 case CONF_ACK: 1282 if (h->ident != sp->confid[cp->protoidx]) { 1283 if (debug) 1284 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1285 SPP_ARGS(ifp), cp->name, 1286 h->ident, sp->confid[cp->protoidx]); 1287 ++ifp->if_ierrors; 1288 break; 1289 } 1290 switch (sp->state[cp->protoidx]) { 1291 case STATE_CLOSED: 1292 case STATE_STOPPED: 1293 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1294 break; 1295 case STATE_CLOSING: 1296 case STATE_STOPPING: 1297 break; 1298 case STATE_REQ_SENT: 1299 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1300 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1301 break; 1302 case STATE_OPENED: 1303 (cp->tld)(sp); 1304 /* fall through */ 1305 case STATE_ACK_RCVD: 1306 (cp->scr)(sp); 1307 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1308 break; 1309 case STATE_ACK_SENT: 1310 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1311 sppp_cp_change_state(cp, sp, STATE_OPENED); 1312 if (debug) 1313 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1314 SPP_ARGS(ifp), cp->name); 1315 (cp->tlu)(sp); 1316 break; 1317 default: 1318 printf(SPP_FMT "%s illegal %s in state %s\n", 1319 SPP_ARGS(ifp), cp->name, 1320 sppp_cp_type_name(h->type), 1321 sppp_state_name(sp->state[cp->protoidx])); 1322 ++ifp->if_ierrors; 1323 } 1324 break; 1325 case CONF_NAK: 1326 case CONF_REJ: 1327 if (h->ident != sp->confid[cp->protoidx]) { 1328 if (debug) 1329 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1330 SPP_ARGS(ifp), cp->name, 1331 h->ident, sp->confid[cp->protoidx]); 1332 ++ifp->if_ierrors; 1333 break; 1334 } 1335 if (h->type == CONF_NAK) 1336 (cp->RCN_nak)(sp, h, len); 1337 else /* CONF_REJ */ 1338 (cp->RCN_rej)(sp, h, len); 1339 1340 switch (sp->state[cp->protoidx]) { 1341 case STATE_CLOSED: 1342 case STATE_STOPPED: 1343 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1344 break; 1345 case STATE_REQ_SENT: 1346 case STATE_ACK_SENT: 1347 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1348 (cp->scr)(sp); 1349 break; 1350 case STATE_OPENED: 1351 (cp->tld)(sp); 1352 /* fall through */ 1353 case STATE_ACK_RCVD: 1354 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1355 (cp->scr)(sp); 1356 break; 1357 case STATE_CLOSING: 1358 case STATE_STOPPING: 1359 break; 1360 default: 1361 printf(SPP_FMT "%s illegal %s in state %s\n", 1362 SPP_ARGS(ifp), cp->name, 1363 sppp_cp_type_name(h->type), 1364 sppp_state_name(sp->state[cp->protoidx])); 1365 ++ifp->if_ierrors; 1366 } 1367 break; 1368 1369 case TERM_REQ: 1370 switch (sp->state[cp->protoidx]) { 1371 case STATE_ACK_RCVD: 1372 case STATE_ACK_SENT: 1373 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1374 /* fall through */ 1375 case STATE_CLOSED: 1376 case STATE_STOPPED: 1377 case STATE_CLOSING: 1378 case STATE_STOPPING: 1379 case STATE_REQ_SENT: 1380 sta: 1381 /* Send Terminate-Ack packet. */ 1382 if (debug) 1383 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1384 SPP_ARGS(ifp), cp->name); 1385 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1386 break; 1387 case STATE_OPENED: 1388 (cp->tld)(sp); 1389 sp->rst_counter[cp->protoidx] = 0; 1390 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1391 goto sta; 1392 break; 1393 default: 1394 printf(SPP_FMT "%s illegal %s in state %s\n", 1395 SPP_ARGS(ifp), cp->name, 1396 sppp_cp_type_name(h->type), 1397 sppp_state_name(sp->state[cp->protoidx])); 1398 ++ifp->if_ierrors; 1399 } 1400 break; 1401 case TERM_ACK: 1402 switch (sp->state[cp->protoidx]) { 1403 case STATE_CLOSED: 1404 case STATE_STOPPED: 1405 case STATE_REQ_SENT: 1406 case STATE_ACK_SENT: 1407 break; 1408 case STATE_CLOSING: 1409 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1410 (cp->tlf)(sp); 1411 break; 1412 case STATE_STOPPING: 1413 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1414 (cp->tlf)(sp); 1415 break; 1416 case STATE_ACK_RCVD: 1417 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1418 break; 1419 case STATE_OPENED: 1420 (cp->tld)(sp); 1421 (cp->scr)(sp); 1422 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1423 break; 1424 default: 1425 printf(SPP_FMT "%s illegal %s in state %s\n", 1426 SPP_ARGS(ifp), cp->name, 1427 sppp_cp_type_name(h->type), 1428 sppp_state_name(sp->state[cp->protoidx])); 1429 ++ifp->if_ierrors; 1430 } 1431 break; 1432 case CODE_REJ: 1433 case PROTO_REJ: 1434 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1435 log(LOG_INFO, 1436 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, " 1437 "danger will robinson\n", 1438 SPP_ARGS(ifp), cp->name, 1439 sppp_cp_type_name(h->type), ntohs(*((u_short *)p))); 1440 switch (sp->state[cp->protoidx]) { 1441 case STATE_CLOSED: 1442 case STATE_STOPPED: 1443 case STATE_REQ_SENT: 1444 case STATE_ACK_SENT: 1445 case STATE_CLOSING: 1446 case STATE_STOPPING: 1447 case STATE_OPENED: 1448 break; 1449 case STATE_ACK_RCVD: 1450 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1451 break; 1452 default: 1453 printf(SPP_FMT "%s illegal %s in state %s\n", 1454 SPP_ARGS(ifp), cp->name, 1455 sppp_cp_type_name(h->type), 1456 sppp_state_name(sp->state[cp->protoidx])); 1457 ++ifp->if_ierrors; 1458 } 1459 break; 1460 case DISC_REQ: 1461 if (cp->proto != PPP_LCP) 1462 goto illegal; 1463 /* Discard the packet. */ 1464 break; 1465 case ECHO_REQ: 1466 if (cp->proto != PPP_LCP) 1467 goto illegal; 1468 if (sp->state[cp->protoidx] != STATE_OPENED) { 1469 if (debug) 1470 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1471 SPP_ARGS(ifp)); 1472 ++ifp->if_ierrors; 1473 break; 1474 } 1475 if (len < 8) { 1476 if (debug) 1477 addlog(SPP_FMT "invalid lcp echo request " 1478 "packet length: %d bytes\n", 1479 SPP_ARGS(ifp), len); 1480 break; 1481 } 1482 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1483 /* Line loopback mode detected. */ 1484 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1485 if_down (ifp); 1486 sppp_qflush (&sp->pp_cpq); 1487 1488 /* Shut down the PPP link. */ 1489 /* XXX */ 1490 lcp.Down(sp); 1491 lcp.Up(sp); 1492 break; 1493 } 1494 *(long*)(h+1) = htonl (sp->lcp.magic); 1495 if (debug) 1496 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1497 SPP_ARGS(ifp)); 1498 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1499 break; 1500 case ECHO_REPLY: 1501 if (cp->proto != PPP_LCP) 1502 goto illegal; 1503 if (h->ident != sp->lcp.echoid) { 1504 ++ifp->if_ierrors; 1505 break; 1506 } 1507 if (len < 8) { 1508 if (debug) 1509 addlog(SPP_FMT "lcp invalid echo reply " 1510 "packet length: %d bytes\n", 1511 SPP_ARGS(ifp), len); 1512 break; 1513 } 1514 if (debug) 1515 addlog(SPP_FMT "lcp got echo rep\n", 1516 SPP_ARGS(ifp)); 1517 if (ntohl (*(long*)(h+1)) != sp->lcp.magic) 1518 sp->pp_alivecnt = 0; 1519 break; 1520 default: 1521 /* Unknown packet type -- send Code-Reject packet. */ 1522 illegal: 1523 if (debug) 1524 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1525 SPP_ARGS(ifp), cp->name, h->type); 1526 sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq, 1527 m->m_pkthdr.len, h); 1528 ++ifp->if_ierrors; 1529 } 1530} 1531 1532 1533/* 1534 * The generic part of all Up/Down/Open/Close/TO event handlers. 1535 * Basically, the state transition handling in the automaton. 1536 */ 1537static void 1538sppp_up_event(const struct cp *cp, struct sppp *sp) 1539{ 1540 STDDCL; 1541 1542 if (debug) 1543 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1544 SPP_ARGS(ifp), cp->name, 1545 sppp_state_name(sp->state[cp->protoidx])); 1546 1547 switch (sp->state[cp->protoidx]) { 1548 case STATE_INITIAL: 1549 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1550 break; 1551 case STATE_STARTING: 1552 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1553 (cp->scr)(sp); 1554 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1555 break; 1556 default: 1557 printf(SPP_FMT "%s illegal up in state %s\n", 1558 SPP_ARGS(ifp), cp->name, 1559 sppp_state_name(sp->state[cp->protoidx])); 1560 } 1561} 1562 1563static void 1564sppp_down_event(const struct cp *cp, struct sppp *sp) 1565{ 1566 STDDCL; 1567 1568 if (debug) 1569 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1570 SPP_ARGS(ifp), cp->name, 1571 sppp_state_name(sp->state[cp->protoidx])); 1572 1573 switch (sp->state[cp->protoidx]) { 1574 case STATE_CLOSED: 1575 case STATE_CLOSING: 1576 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1577 break; 1578 case STATE_STOPPED: 1579 sppp_cp_change_state(cp, sp, STATE_STARTING); 1580 (cp->tls)(sp); 1581 break; 1582 case STATE_STOPPING: 1583 case STATE_REQ_SENT: 1584 case STATE_ACK_RCVD: 1585 case STATE_ACK_SENT: 1586 sppp_cp_change_state(cp, sp, STATE_STARTING); 1587 break; 1588 case STATE_OPENED: 1589 (cp->tld)(sp); 1590 sppp_cp_change_state(cp, sp, STATE_STARTING); 1591 break; 1592 default: 1593 printf(SPP_FMT "%s illegal down in state %s\n", 1594 SPP_ARGS(ifp), cp->name, 1595 sppp_state_name(sp->state[cp->protoidx])); 1596 } 1597} 1598 1599 1600static void 1601sppp_open_event(const struct cp *cp, struct sppp *sp) 1602{ 1603 STDDCL; 1604 1605 if (debug) 1606 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1607 SPP_ARGS(ifp), cp->name, 1608 sppp_state_name(sp->state[cp->protoidx])); 1609 1610 switch (sp->state[cp->protoidx]) { 1611 case STATE_INITIAL: 1612 sppp_cp_change_state(cp, sp, STATE_STARTING); 1613 (cp->tls)(sp); 1614 break; 1615 case STATE_STARTING: 1616 break; 1617 case STATE_CLOSED: 1618 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1619 (cp->scr)(sp); 1620 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1621 break; 1622 case STATE_STOPPED: 1623 case STATE_STOPPING: 1624 case STATE_REQ_SENT: 1625 case STATE_ACK_RCVD: 1626 case STATE_ACK_SENT: 1627 case STATE_OPENED: 1628 break; 1629 case STATE_CLOSING: 1630 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1631 break; 1632 } 1633} 1634 1635 1636static void 1637sppp_close_event(const struct cp *cp, struct sppp *sp) 1638{ 1639 STDDCL; 1640 1641 if (debug) 1642 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1643 SPP_ARGS(ifp), cp->name, 1644 sppp_state_name(sp->state[cp->protoidx])); 1645 1646 switch (sp->state[cp->protoidx]) { 1647 case STATE_INITIAL: 1648 case STATE_CLOSED: 1649 case STATE_CLOSING: 1650 break; 1651 case STATE_STARTING: 1652 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1653 (cp->tlf)(sp); 1654 break; 1655 case STATE_STOPPED: 1656 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1657 break; 1658 case STATE_STOPPING: 1659 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1660 break; 1661 case STATE_OPENED: 1662 (cp->tld)(sp); 1663 /* fall through */ 1664 case STATE_REQ_SENT: 1665 case STATE_ACK_RCVD: 1666 case STATE_ACK_SENT: 1667 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1668 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0); 1669 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1670 break; 1671 } 1672} 1673 1674static void 1675sppp_to_event(const struct cp *cp, struct sppp *sp) 1676{ 1677 STDDCL; 1678 int s; 1679 1680 s = splimp(); 1681 if (debug) 1682 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1683 SPP_ARGS(ifp), cp->name, 1684 sppp_state_name(sp->state[cp->protoidx]), 1685 sp->rst_counter[cp->protoidx]); 1686 1687 if (--sp->rst_counter[cp->protoidx] < 0) 1688 /* TO- event */ 1689 switch (sp->state[cp->protoidx]) { 1690 case STATE_CLOSING: 1691 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1692 (cp->tlf)(sp); 1693 break; 1694 case STATE_STOPPING: 1695 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1696 (cp->tlf)(sp); 1697 break; 1698 case STATE_REQ_SENT: 1699 case STATE_ACK_RCVD: 1700 case STATE_ACK_SENT: 1701 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1702 (cp->tlf)(sp); 1703 break; 1704 } 1705 else 1706 /* TO+ event */ 1707 switch (sp->state[cp->protoidx]) { 1708 case STATE_CLOSING: 1709 case STATE_STOPPING: 1710 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 1711 0, 0); 1712 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1713 sp->ch[cp->protoidx]); 1714 break; 1715 case STATE_REQ_SENT: 1716 case STATE_ACK_RCVD: 1717 (cp->scr)(sp); 1718 /* sppp_cp_change_state() will restart the timer */ 1719 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1720 break; 1721 case STATE_ACK_SENT: 1722 (cp->scr)(sp); 1723 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1724 sp->ch[cp->protoidx]); 1725 break; 1726 } 1727 1728 splx(s); 1729} 1730 1731/* 1732 * Change the state of a control protocol in the state automaton. 1733 * Takes care of starting/stopping the restart timer. 1734 */ 1735void 1736sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1737{ 1738 sp->state[cp->protoidx] = newstate; 1739 1740 UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]); 1741 switch (newstate) { 1742 case STATE_INITIAL: 1743 case STATE_STARTING: 1744 case STATE_CLOSED: 1745 case STATE_STOPPED: 1746 case STATE_OPENED: 1747 break; 1748 case STATE_CLOSING: 1749 case STATE_STOPPING: 1750 case STATE_REQ_SENT: 1751 case STATE_ACK_RCVD: 1752 case STATE_ACK_SENT: 1753 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1754 sp->ch[cp->protoidx]); 1755 break; 1756 } 1757} 1758 /* 1759 *--------------------------------------------------------------------------* 1760 * * 1761 * The LCP implementation. * 1762 * * 1763 *--------------------------------------------------------------------------* 1764 */ 1765static void 1766sppp_lcp_init(struct sppp *sp) 1767{ 1768 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1769 sp->lcp.magic = 0; 1770 sp->state[IDX_LCP] = STATE_INITIAL; 1771 sp->fail_counter[IDX_LCP] = 0; 1772 sp->lcp.protos = 0; 1773 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1774 1775 /* 1776 * Initialize counters and timeout values. Note that we don't 1777 * use the 3 seconds suggested in RFC 1661 since we are likely 1778 * running on a fast link. XXX We should probably implement 1779 * the exponential backoff option. Note that these values are 1780 * relevant for all control protocols, not just LCP only. 1781 */ 1782 sp->lcp.timeout = 1 * hz; 1783 sp->lcp.max_terminate = 2; 1784 sp->lcp.max_configure = 10; 1785 sp->lcp.max_failure = 10; 1786#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1787 callout_handle_init(&sp->ch[IDX_LCP]); 1788#endif 1789} 1790 1791static void 1792sppp_lcp_up(struct sppp *sp) 1793{ 1794 STDDCL; 1795 1796 /* 1797 * If this interface is passive or dial-on-demand, and we are 1798 * still in Initial state, it means we've got an incoming 1799 * call. Activate the interface. 1800 */ 1801 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1802 if (debug) 1803 log(LOG_DEBUG, 1804 SPP_FMT "Up event", SPP_ARGS(ifp)); 1805 ifp->if_flags |= IFF_RUNNING; 1806 if (sp->state[IDX_LCP] == STATE_INITIAL) { 1807 if (debug) 1808 addlog("(incoming call)\n"); 1809 sp->pp_flags |= PP_CALLIN; 1810 lcp.Open(sp); 1811 } else if (debug) 1812 addlog("\n"); 1813 } 1814 1815 sppp_up_event(&lcp, sp); 1816} 1817 1818static void 1819sppp_lcp_down(struct sppp *sp) 1820{ 1821 STDDCL; 1822 1823 sppp_down_event(&lcp, sp); 1824 1825 /* 1826 * If this is neither a dial-on-demand nor a passive 1827 * interface, simulate an ``ifconfig down'' action, so the 1828 * administrator can force a redial by another ``ifconfig 1829 * up''. XXX For leased line operation, should we immediately 1830 * try to reopen the connection here? 1831 */ 1832 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 1833 log(LOG_INFO, 1834 SPP_FMT "Down event, taking interface down.\n", 1835 SPP_ARGS(ifp)); 1836 if_down(ifp); 1837 } else { 1838 if (debug) 1839 log(LOG_DEBUG, 1840 SPP_FMT "Down event (carrier loss)\n", 1841 SPP_ARGS(ifp)); 1842 } 1843 sp->pp_flags &= ~PP_CALLIN; 1844 if (sp->state[IDX_LCP] != STATE_INITIAL) 1845 lcp.Close(sp); 1846 ifp->if_flags &= ~IFF_RUNNING; 1847} 1848 1849static void 1850sppp_lcp_open(struct sppp *sp) 1851{ 1852 /* 1853 * If we are authenticator, negotiate LCP_AUTH 1854 */ 1855 if (sp->hisauth.proto != 0) 1856 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 1857 else 1858 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 1859 sp->pp_flags &= ~PP_NEEDAUTH; 1860 sppp_open_event(&lcp, sp); 1861} 1862 1863static void 1864sppp_lcp_close(struct sppp *sp) 1865{ 1866 sppp_close_event(&lcp, sp); 1867} 1868 1869static void 1870sppp_lcp_TO(void *cookie) 1871{ 1872 sppp_to_event(&lcp, (struct sppp *)cookie); 1873} 1874 1875/* 1876 * Analyze a configure request. Return true if it was agreeable, and 1877 * caused action sca, false if it has been rejected or nak'ed, and 1878 * caused action scn. (The return value is used to make the state 1879 * transition decision in the state automaton.) 1880 */ 1881static int 1882sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 1883{ 1884 STDDCL; 1885 u_char *buf, *r, *p; 1886 int origlen, rlen; 1887 u_long nmagic; 1888 u_short authproto; 1889 1890 len -= 4; 1891 origlen = len; 1892 buf = r = malloc (len, M_TEMP, M_NOWAIT); 1893 if (! buf) 1894 return (0); 1895 1896 if (debug) 1897 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 1898 SPP_ARGS(ifp)); 1899 1900 /* pass 1: check for things that need to be rejected */ 1901 p = (void*) (h+1); 1902 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1903 if (debug) 1904 addlog(" %s ", sppp_lcp_opt_name(*p)); 1905 switch (*p) { 1906 case LCP_OPT_MAGIC: 1907 /* Magic number. */ 1908 /* fall through, both are same length */ 1909 case LCP_OPT_ASYNC_MAP: 1910 /* Async control character map. */ 1911 if (len >= 6 || p[1] == 6) 1912 continue; 1913 if (debug) 1914 addlog("[invalid] "); 1915 break; 1916 case LCP_OPT_MRU: 1917 /* Maximum receive unit. */ 1918 if (len >= 4 && p[1] == 4) 1919 continue; 1920 if (debug) 1921 addlog("[invalid] "); 1922 break; 1923 case LCP_OPT_AUTH_PROTO: 1924 if (len < 4) { 1925 if (debug) 1926 addlog("[invalid] "); 1927 break; 1928 } 1929 authproto = (p[2] << 8) + p[3]; 1930 if (authproto == PPP_CHAP && p[1] != 5) { 1931 if (debug) 1932 addlog("[invalid chap len] "); 1933 break; 1934 } 1935 if (sp->myauth.proto == 0) { 1936 /* we are not configured to do auth */ 1937 if (debug) 1938 addlog("[not configured] "); 1939 break; 1940 } 1941 /* 1942 * Remote want us to authenticate, remember this, 1943 * so we stay in PHASE_AUTHENTICATE after LCP got 1944 * up. 1945 */ 1946 sp->pp_flags |= PP_NEEDAUTH; 1947 continue; 1948 default: 1949 /* Others not supported. */ 1950 if (debug) 1951 addlog("[rej] "); 1952 break; 1953 } 1954 /* Add the option to rejected list. */ 1955 bcopy (p, r, p[1]); 1956 r += p[1]; 1957 rlen += p[1]; 1958 } 1959 if (rlen) { 1960 if (debug) 1961 addlog(" send conf-rej\n"); 1962 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 1963 return 0; 1964 } else if (debug) 1965 addlog("\n"); 1966 1967 /* 1968 * pass 2: check for option values that are unacceptable and 1969 * thus require to be nak'ed. 1970 */ 1971 if (debug) 1972 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 1973 SPP_ARGS(ifp)); 1974 1975 p = (void*) (h+1); 1976 len = origlen; 1977 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 1978 if (debug) 1979 addlog(" %s ", sppp_lcp_opt_name(*p)); 1980 switch (*p) { 1981 case LCP_OPT_MAGIC: 1982 /* Magic number -- extract. */ 1983 nmagic = (u_long)p[2] << 24 | 1984 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 1985 if (nmagic != sp->lcp.magic) { 1986 if (debug) 1987 addlog("0x%lx ", nmagic); 1988 continue; 1989 } 1990 /* 1991 * Local and remote magics equal -- loopback? 1992 */ 1993 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 1994 printf (SPP_FMT "loopback\n", 1995 SPP_ARGS(ifp)); 1996 sp->pp_loopcnt = 0; 1997 if (ifp->if_flags & IFF_UP) { 1998 if_down(ifp); 1999 sppp_qflush(&sp->pp_cpq); 2000 /* XXX ? */ 2001 lcp.Down(sp); 2002 lcp.Up(sp); 2003 } 2004 } else if (debug) 2005 addlog("[glitch] "); 2006 ++sp->pp_loopcnt; 2007 /* 2008 * We negate our magic here, and NAK it. If 2009 * we see it later in an NAK packet, we 2010 * suggest a new one. 2011 */ 2012 nmagic = ~sp->lcp.magic; 2013 /* Gonna NAK it. */ 2014 p[2] = nmagic >> 24; 2015 p[3] = nmagic >> 16; 2016 p[4] = nmagic >> 8; 2017 p[5] = nmagic; 2018 break; 2019 2020 case LCP_OPT_ASYNC_MAP: 2021 /* Async control character map -- check to be zero. */ 2022 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2023 if (debug) 2024 addlog("[empty] "); 2025 continue; 2026 } 2027 if (debug) 2028 addlog("[non-empty] "); 2029 /* suggest a zero one */ 2030 p[2] = p[3] = p[4] = p[5] = 0; 2031 break; 2032 2033 case LCP_OPT_MRU: 2034 /* 2035 * Maximum receive unit. Always agreeable, 2036 * but ignored by now. 2037 */ 2038 sp->lcp.their_mru = p[2] * 256 + p[3]; 2039 if (debug) 2040 addlog("%lu ", sp->lcp.their_mru); 2041 continue; 2042 2043 case LCP_OPT_AUTH_PROTO: 2044 authproto = (p[2] << 8) + p[3]; 2045 if (sp->myauth.proto != authproto) { 2046 /* not agreed, nak */ 2047 if (debug) 2048 addlog("[mine %s != his %s] ", 2049 sppp_proto_name(sp->hisauth.proto), 2050 sppp_proto_name(authproto)); 2051 p[2] = sp->myauth.proto >> 8; 2052 p[3] = sp->myauth.proto; 2053 break; 2054 } 2055 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2056 if (debug) 2057 addlog("[chap not MD5] "); 2058 p[4] = CHAP_MD5; 2059 break; 2060 } 2061 continue; 2062 } 2063 /* Add the option to nak'ed list. */ 2064 bcopy (p, r, p[1]); 2065 r += p[1]; 2066 rlen += p[1]; 2067 } 2068 if (rlen) { 2069 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2070 if (debug) 2071 addlog(" max_failure (%d) exceeded, " 2072 "send conf-rej\n", 2073 sp->lcp.max_failure); 2074 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2075 } else { 2076 if (debug) 2077 addlog(" send conf-nak\n"); 2078 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2079 } 2080 return 0; 2081 } else { 2082 if (debug) 2083 addlog(" send conf-ack\n"); 2084 sp->fail_counter[IDX_LCP] = 0; 2085 sp->pp_loopcnt = 0; 2086 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2087 h->ident, origlen, h+1); 2088 } 2089 2090 free (buf, M_TEMP); 2091 return (rlen == 0); 2092} 2093 2094/* 2095 * Analyze the LCP Configure-Reject option list, and adjust our 2096 * negotiation. 2097 */ 2098static void 2099sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2100{ 2101 STDDCL; 2102 u_char *buf, *p; 2103 2104 len -= 4; 2105 buf = malloc (len, M_TEMP, M_NOWAIT); 2106 if (!buf) 2107 return; 2108 2109 if (debug) 2110 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2111 SPP_ARGS(ifp)); 2112 2113 p = (void*) (h+1); 2114 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2115 if (debug) 2116 addlog(" %s ", sppp_lcp_opt_name(*p)); 2117 switch (*p) { 2118 case LCP_OPT_MAGIC: 2119 /* Magic number -- can't use it, use 0 */ 2120 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2121 sp->lcp.magic = 0; 2122 break; 2123 case LCP_OPT_MRU: 2124 /* 2125 * Should not be rejected anyway, since we only 2126 * negotiate a MRU if explicitly requested by 2127 * peer. 2128 */ 2129 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2130 break; 2131 case LCP_OPT_AUTH_PROTO: 2132 /* 2133 * Peer doesn't want to authenticate himself, 2134 * deny unless this is a dialout call, and 2135 * AUTHFLAG_NOCALLOUT is set. 2136 */ 2137 if ((sp->pp_flags & PP_CALLIN) == 0 && 2138 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2139 if (debug) 2140 addlog("[don't insist on auth " 2141 "for callout]"); 2142 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2143 break; 2144 } 2145 if (debug) 2146 addlog("[access denied]\n"); 2147 lcp.Close(sp); 2148 break; 2149 } 2150 } 2151 if (debug) 2152 addlog("\n"); 2153 free (buf, M_TEMP); 2154 return; 2155} 2156 2157/* 2158 * Analyze the LCP Configure-NAK option list, and adjust our 2159 * negotiation. 2160 */ 2161static void 2162sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2163{ 2164 STDDCL; 2165 u_char *buf, *p; 2166 u_long magic; 2167 2168 len -= 4; 2169 buf = malloc (len, M_TEMP, M_NOWAIT); 2170 if (!buf) 2171 return; 2172 2173 if (debug) 2174 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2175 SPP_ARGS(ifp)); 2176 2177 p = (void*) (h+1); 2178 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2179 if (debug) 2180 addlog(" %s ", sppp_lcp_opt_name(*p)); 2181 switch (*p) { 2182 case LCP_OPT_MAGIC: 2183 /* Magic number -- renegotiate */ 2184 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2185 len >= 6 && p[1] == 6) { 2186 magic = (u_long)p[2] << 24 | 2187 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2188 /* 2189 * If the remote magic is our negated one, 2190 * this looks like a loopback problem. 2191 * Suggest a new magic to make sure. 2192 */ 2193 if (magic == ~sp->lcp.magic) { 2194 if (debug) 2195 addlog("magic glitch "); 2196#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2197 sp->lcp.magic = random(); 2198#else 2199 sp->lcp.magic = time.tv_sec + time.tv_usec; 2200#endif 2201 } else { 2202 sp->lcp.magic = magic; 2203 if (debug) 2204 addlog("%lu ", magic); 2205 } 2206 } 2207 break; 2208 case LCP_OPT_MRU: 2209 /* 2210 * Peer wants to advise us to negotiate an MRU. 2211 * Agree on it if it's reasonable, or use 2212 * default otherwise. 2213 */ 2214 if (len >= 4 && p[1] == 4) { 2215 u_int mru = p[2] * 256 + p[3]; 2216 if (debug) 2217 addlog("%d ", mru); 2218 if (mru < PP_MTU || mru > PP_MAX_MRU) 2219 mru = PP_MTU; 2220 sp->lcp.mru = mru; 2221 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2222 } 2223 break; 2224 case LCP_OPT_AUTH_PROTO: 2225 /* 2226 * Peer doesn't like our authentication method, 2227 * deny. 2228 */ 2229 if (debug) 2230 addlog("[access denied]\n"); 2231 lcp.Close(sp); 2232 break; 2233 } 2234 } 2235 if (debug) 2236 addlog("\n"); 2237 free (buf, M_TEMP); 2238 return; 2239} 2240 2241static void 2242sppp_lcp_tlu(struct sppp *sp) 2243{ 2244 STDDCL; 2245 int i; 2246 u_long mask; 2247 2248 /* XXX ? */ 2249 if (! (ifp->if_flags & IFF_UP) && 2250 (ifp->if_flags & IFF_RUNNING)) { 2251 /* Coming out of loopback mode. */ 2252 if_up(ifp); 2253 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2254 } 2255 2256 for (i = 0; i < IDX_COUNT; i++) 2257 if ((cps[i])->flags & CP_QUAL) 2258 (cps[i])->Open(sp); 2259 2260 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2261 (sp->pp_flags & PP_NEEDAUTH) != 0) 2262 sp->pp_phase = PHASE_AUTHENTICATE; 2263 else 2264 sp->pp_phase = PHASE_NETWORK; 2265 2266 if (debug) 2267 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2268 sppp_phase_name(sp->pp_phase)); 2269 2270 /* 2271 * Open all authentication protocols. This is even required 2272 * if we already proceeded to network phase, since it might be 2273 * that remote wants us to authenticate, so we might have to 2274 * send a PAP request. Undesired authentication protocols 2275 * don't do anything when they get an Open event. 2276 */ 2277 for (i = 0; i < IDX_COUNT; i++) 2278 if ((cps[i])->flags & CP_AUTH) 2279 (cps[i])->Open(sp); 2280 2281 if (sp->pp_phase == PHASE_NETWORK) { 2282 /* Notify all NCPs. */ 2283 for (i = 0; i < IDX_COUNT; i++) 2284 if ((cps[i])->flags & CP_NCP) 2285 (cps[i])->Open(sp); 2286 } 2287 2288 /* Send Up events to all started protos. */ 2289 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2290 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) 2291 (cps[i])->Up(sp); 2292 2293 if (sp->pp_phase == PHASE_NETWORK) 2294 /* if no NCP is starting, close down */ 2295 sppp_lcp_check_and_close(sp); 2296} 2297 2298static void 2299sppp_lcp_tld(struct sppp *sp) 2300{ 2301 STDDCL; 2302 int i; 2303 u_long mask; 2304 2305 sp->pp_phase = PHASE_TERMINATE; 2306 2307 if (debug) 2308 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2309 sppp_phase_name(sp->pp_phase)); 2310 2311 /* 2312 * Take upper layers down. We send the Down event first and 2313 * the Close second to prevent the upper layers from sending 2314 * ``a flurry of terminate-request packets'', as the RFC 2315 * describes it. 2316 */ 2317 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2318 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) { 2319 (cps[i])->Down(sp); 2320 (cps[i])->Close(sp); 2321 } 2322} 2323 2324static void 2325sppp_lcp_tls(struct sppp *sp) 2326{ 2327 STDDCL; 2328 2329 sp->pp_phase = PHASE_ESTABLISH; 2330 2331 if (debug) 2332 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2333 sppp_phase_name(sp->pp_phase)); 2334 2335 /* Notify lower layer if desired. */ 2336 if (sp->pp_tls) 2337 (sp->pp_tls)(sp); 2338 else 2339 (sp->pp_up)(sp); 2340} 2341 2342static void 2343sppp_lcp_tlf(struct sppp *sp) 2344{ 2345 STDDCL; 2346 2347 sp->pp_phase = PHASE_DEAD; 2348 if (debug) 2349 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2350 sppp_phase_name(sp->pp_phase)); 2351 2352 /* Notify lower layer if desired. */ 2353 if (sp->pp_tlf) 2354 (sp->pp_tlf)(sp); 2355 else 2356 (sp->pp_down)(sp); 2357} 2358 2359static void 2360sppp_lcp_scr(struct sppp *sp) 2361{ 2362 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2363 int i = 0; 2364 u_short authproto; 2365 2366 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2367 if (! sp->lcp.magic) 2368#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2369 sp->lcp.magic = random(); 2370#else 2371 sp->lcp.magic = time.tv_sec + time.tv_usec; 2372#endif 2373 opt[i++] = LCP_OPT_MAGIC; 2374 opt[i++] = 6; 2375 opt[i++] = sp->lcp.magic >> 24; 2376 opt[i++] = sp->lcp.magic >> 16; 2377 opt[i++] = sp->lcp.magic >> 8; 2378 opt[i++] = sp->lcp.magic; 2379 } 2380 2381 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2382 opt[i++] = LCP_OPT_MRU; 2383 opt[i++] = 4; 2384 opt[i++] = sp->lcp.mru >> 8; 2385 opt[i++] = sp->lcp.mru; 2386 } 2387 2388 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2389 authproto = sp->hisauth.proto; 2390 opt[i++] = LCP_OPT_AUTH_PROTO; 2391 opt[i++] = authproto == PPP_CHAP? 5: 4; 2392 opt[i++] = authproto >> 8; 2393 opt[i++] = authproto; 2394 if (authproto == PPP_CHAP) 2395 opt[i++] = CHAP_MD5; 2396 } 2397 2398 sp->confid[IDX_LCP] = ++sp->pp_seq; 2399 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2400} 2401 2402/* 2403 * Check the open NCPs, return true if at least one NCP is open. 2404 */ 2405static int 2406sppp_ncp_check(struct sppp *sp) 2407{ 2408 int i, mask; 2409 2410 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2411 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP) 2412 return 1; 2413 return 0; 2414} 2415 2416/* 2417 * Re-check the open NCPs and see if we should terminate the link. 2418 * Called by the NCPs during their tlf action handling. 2419 */ 2420static void 2421sppp_lcp_check_and_close(struct sppp *sp) 2422{ 2423 2424 if (sp->pp_phase < PHASE_NETWORK) 2425 /* don't bother, we are already going down */ 2426 return; 2427 2428 if (sppp_ncp_check(sp)) 2429 return; 2430 2431 lcp.Close(sp); 2432} 2433 /* 2434 *--------------------------------------------------------------------------* 2435 * * 2436 * The IPCP implementation. * 2437 * * 2438 *--------------------------------------------------------------------------* 2439 */ 2440 2441static void 2442sppp_ipcp_init(struct sppp *sp) 2443{ 2444 sp->ipcp.opts = 0; 2445 sp->ipcp.flags = 0; 2446 sp->state[IDX_IPCP] = STATE_INITIAL; 2447 sp->fail_counter[IDX_IPCP] = 0; 2448#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2449 callout_handle_init(&sp->ch[IDX_IPCP]); 2450#endif 2451} 2452 2453static void 2454sppp_ipcp_up(struct sppp *sp) 2455{ 2456 sppp_up_event(&ipcp, sp); 2457} 2458 2459static void 2460sppp_ipcp_down(struct sppp *sp) 2461{ 2462 sppp_down_event(&ipcp, sp); 2463} 2464 2465static void 2466sppp_ipcp_open(struct sppp *sp) 2467{ 2468 STDDCL; 2469 u_long myaddr, hisaddr; 2470 2471 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2472 /* 2473 * If we don't have his address, this probably means our 2474 * interface doesn't want to talk IP at all. (This could 2475 * be the case if somebody wants to speak only IPX, for 2476 * example.) Don't open IPCP in this case. 2477 */ 2478 if (hisaddr == 0L) { 2479 /* XXX this message should go away */ 2480 if (debug) 2481 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2482 SPP_ARGS(ifp)); 2483 return; 2484 } 2485 2486 if (myaddr == 0L) { 2487 /* 2488 * I don't have an assigned address, so i need to 2489 * negotiate my address. 2490 */ 2491 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2492 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2493 } 2494 sppp_open_event(&ipcp, sp); 2495} 2496 2497static void 2498sppp_ipcp_close(struct sppp *sp) 2499{ 2500 sppp_close_event(&ipcp, sp); 2501 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2502 /* 2503 * My address was dynamic, clear it again. 2504 */ 2505 sppp_set_ip_addr(sp, 0L); 2506} 2507 2508static void 2509sppp_ipcp_TO(void *cookie) 2510{ 2511 sppp_to_event(&ipcp, (struct sppp *)cookie); 2512} 2513 2514/* 2515 * Analyze a configure request. Return true if it was agreeable, and 2516 * caused action sca, false if it has been rejected or nak'ed, and 2517 * caused action scn. (The return value is used to make the state 2518 * transition decision in the state automaton.) 2519 */ 2520static int 2521sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2522{ 2523 u_char *buf, *r, *p; 2524 struct ifnet *ifp = &sp->pp_if; 2525 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2526 u_long hisaddr, desiredaddr; 2527 2528 len -= 4; 2529 origlen = len; 2530 /* 2531 * Make sure to allocate a buf that can at least hold a 2532 * conf-nak with an `address' option. We might need it below. 2533 */ 2534 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2535 if (! buf) 2536 return (0); 2537 2538 /* pass 1: see if we can recognize them */ 2539 if (debug) 2540 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2541 SPP_ARGS(ifp)); 2542 p = (void*) (h+1); 2543 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2544 if (debug) 2545 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2546 switch (*p) { 2547#ifdef notyet 2548 case IPCP_OPT_COMPRESSION: 2549 if (len >= 6 && p[1] >= 6) { 2550 /* correctly formed compress option */ 2551 continue; 2552 } 2553 if (debug) 2554 addlog("[invalid] "); 2555 break; 2556#endif 2557 case IPCP_OPT_ADDRESS: 2558 if (len >= 6 && p[1] == 6) { 2559 /* correctly formed address option */ 2560 continue; 2561 } 2562 if (debug) 2563 addlog("[invalid] "); 2564 break; 2565 default: 2566 /* Others not supported. */ 2567 if (debug) 2568 addlog("[rej] "); 2569 break; 2570 } 2571 /* Add the option to rejected list. */ 2572 bcopy (p, r, p[1]); 2573 r += p[1]; 2574 rlen += p[1]; 2575 } 2576 if (rlen) { 2577 if (debug) 2578 addlog(" send conf-rej\n"); 2579 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2580 return 0; 2581 } else if (debug) 2582 addlog("\n"); 2583 2584 /* pass 2: parse option values */ 2585 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2586 if (debug) 2587 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2588 SPP_ARGS(ifp)); 2589 p = (void*) (h+1); 2590 len = origlen; 2591 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2592 if (debug) 2593 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2594 switch (*p) { 2595#ifdef notyet 2596 case IPCP_OPT_COMPRESSION: 2597 continue; 2598#endif 2599 case IPCP_OPT_ADDRESS: 2600 desiredaddr = p[2] << 24 | p[3] << 16 | 2601 p[4] << 8 | p[5]; 2602 if (desiredaddr == hisaddr || 2603 hisaddr == 1 && desiredaddr != 0) { 2604 /* 2605 * Peer's address is same as our value, 2606 * or we have set it to 0.0.0.1 to 2607 * indicate that we do not really care, 2608 * this is agreeable. Gonna conf-ack 2609 * it. 2610 */ 2611 if (debug) 2612 addlog("%s [ack] ", 2613 sppp_dotted_quad(desiredaddr)); 2614 /* record that we've seen it already */ 2615 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2616 continue; 2617 } 2618 /* 2619 * The address wasn't agreeable. This is either 2620 * he sent us 0.0.0.0, asking to assign him an 2621 * address, or he send us another address not 2622 * matching our value. Either case, we gonna 2623 * conf-nak it with our value. 2624 */ 2625 if (debug) { 2626 if (desiredaddr == 0) 2627 addlog("[addr requested] "); 2628 else 2629 addlog("%s [not agreed] ", 2630 sppp_dotted_quad(desiredaddr)); 2631 2632 p[2] = hisaddr >> 24; 2633 p[3] = hisaddr >> 16; 2634 p[4] = hisaddr >> 8; 2635 p[5] = hisaddr; 2636 } 2637 break; 2638 } 2639 /* Add the option to nak'ed list. */ 2640 bcopy (p, r, p[1]); 2641 r += p[1]; 2642 rlen += p[1]; 2643 } 2644 2645 /* 2646 * If we are about to conf-ack the request, but haven't seen 2647 * his address so far, gonna conf-nak it instead, with the 2648 * `address' option present and our idea of his address being 2649 * filled in there, to request negotiation of both addresses. 2650 * 2651 * XXX This can result in an endless req - nak loop if peer 2652 * doesn't want to send us his address. Q: What should we do 2653 * about it? XXX A: implement the max-failure counter. 2654 */ 2655 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2656 buf[0] = IPCP_OPT_ADDRESS; 2657 buf[1] = 6; 2658 buf[2] = hisaddr >> 24; 2659 buf[3] = hisaddr >> 16; 2660 buf[4] = hisaddr >> 8; 2661 buf[5] = hisaddr; 2662 rlen = 6; 2663 if (debug) 2664 addlog("still need hisaddr "); 2665 } 2666 2667 if (rlen) { 2668 if (debug) 2669 addlog(" send conf-nak\n"); 2670 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2671 } else { 2672 if (debug) 2673 addlog(" send conf-ack\n"); 2674 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2675 h->ident, origlen, h+1); 2676 } 2677 2678 free (buf, M_TEMP); 2679 return (rlen == 0); 2680} 2681 2682/* 2683 * Analyze the IPCP Configure-Reject option list, and adjust our 2684 * negotiation. 2685 */ 2686static void 2687sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2688{ 2689 u_char *buf, *p; 2690 struct ifnet *ifp = &sp->pp_if; 2691 int debug = ifp->if_flags & IFF_DEBUG; 2692 2693 len -= 4; 2694 buf = malloc (len, M_TEMP, M_NOWAIT); 2695 if (!buf) 2696 return; 2697 2698 if (debug) 2699 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 2700 SPP_ARGS(ifp)); 2701 2702 p = (void*) (h+1); 2703 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2704 if (debug) 2705 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2706 switch (*p) { 2707 case IPCP_OPT_ADDRESS: 2708 /* 2709 * Peer doesn't grok address option. This is 2710 * bad. XXX Should we better give up here? 2711 */ 2712 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2713 break; 2714#ifdef notyet 2715 case IPCP_OPT_COMPRESS: 2716 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2717 break; 2718#endif 2719 } 2720 } 2721 if (debug) 2722 addlog("\n"); 2723 free (buf, M_TEMP); 2724 return; 2725} 2726 2727/* 2728 * Analyze the IPCP Configure-NAK option list, and adjust our 2729 * negotiation. 2730 */ 2731static void 2732sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2733{ 2734 u_char *buf, *p; 2735 struct ifnet *ifp = &sp->pp_if; 2736 int debug = ifp->if_flags & IFF_DEBUG; 2737 u_long wantaddr; 2738 2739 len -= 4; 2740 buf = malloc (len, M_TEMP, M_NOWAIT); 2741 if (!buf) 2742 return; 2743 2744 if (debug) 2745 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 2746 SPP_ARGS(ifp)); 2747 2748 p = (void*) (h+1); 2749 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2750 if (debug) 2751 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2752 switch (*p) { 2753 case IPCP_OPT_ADDRESS: 2754 /* 2755 * Peer doesn't like our local IP address. See 2756 * if we can do something for him. We'll drop 2757 * him our address then. 2758 */ 2759 if (len >= 6 && p[1] == 6) { 2760 wantaddr = p[2] << 24 | p[3] << 16 | 2761 p[4] << 8 | p[5]; 2762 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2763 if (debug) 2764 addlog("[wantaddr %s] ", 2765 sppp_dotted_quad(wantaddr)); 2766 /* 2767 * When doing dynamic address assignment, 2768 * we accept his offer. Otherwise, we 2769 * ignore it and thus continue to negotiate 2770 * our already existing value. 2771 */ 2772 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2773 sppp_set_ip_addr(sp, wantaddr); 2774 if (debug) 2775 addlog("[agree] "); 2776 } 2777 } 2778 break; 2779#ifdef notyet 2780 case IPCP_OPT_COMPRESS: 2781 /* 2782 * Peer wants different compression parameters. 2783 */ 2784 break; 2785#endif 2786 } 2787 } 2788 if (debug) 2789 addlog("\n"); 2790 free (buf, M_TEMP); 2791 return; 2792} 2793 2794static void 2795sppp_ipcp_tlu(struct sppp *sp) 2796{ 2797} 2798 2799static void 2800sppp_ipcp_tld(struct sppp *sp) 2801{ 2802} 2803 2804static void 2805sppp_ipcp_tls(struct sppp *sp) 2806{ 2807 /* indicate to LCP that it must stay alive */ 2808 sp->lcp.protos |= (1 << IDX_IPCP); 2809} 2810 2811static void 2812sppp_ipcp_tlf(struct sppp *sp) 2813{ 2814 /* we no longer need LCP */ 2815 sp->lcp.protos &= ~(1 << IDX_IPCP); 2816 sppp_lcp_check_and_close(sp); 2817} 2818 2819static void 2820sppp_ipcp_scr(struct sppp *sp) 2821{ 2822 char opt[6 /* compression */ + 6 /* address */]; 2823 u_long ouraddr; 2824 int i = 0; 2825 2826#ifdef notyet 2827 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 2828 opt[i++] = IPCP_OPT_COMPRESSION; 2829 opt[i++] = 6; 2830 opt[i++] = 0; /* VJ header compression */ 2831 opt[i++] = 0x2d; /* VJ header compression */ 2832 opt[i++] = max_slot_id; 2833 opt[i++] = comp_slot_id; 2834 } 2835#endif 2836 2837 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 2838 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 2839 opt[i++] = IPCP_OPT_ADDRESS; 2840 opt[i++] = 6; 2841 opt[i++] = ouraddr >> 24; 2842 opt[i++] = ouraddr >> 16; 2843 opt[i++] = ouraddr >> 8; 2844 opt[i++] = ouraddr; 2845 } 2846 2847 sp->confid[IDX_IPCP] = ++sp->pp_seq; 2848 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 2849} 2850 2851 2852 /* 2853 *--------------------------------------------------------------------------* 2854 * * 2855 * The CHAP implementation. * 2856 * * 2857 *--------------------------------------------------------------------------* 2858 */ 2859 2860/* 2861 * The authentication protocols don't employ a full-fledged state machine as 2862 * the control protocols do, since they do have Open and Close events, but 2863 * not Up and Down, nor are they explicitly terminated. Also, use of the 2864 * authentication protocols may be different in both directions (this makes 2865 * sense, think of a machine that never accepts incoming calls but only 2866 * calls out, it doesn't require the called party to authenticate itself). 2867 * 2868 * Our state machine for the local authentication protocol (we are requesting 2869 * the peer to authenticate) looks like: 2870 * 2871 * RCA- 2872 * +--------------------------------------------+ 2873 * V scn,tld| 2874 * +--------+ Close +---------+ RCA+ 2875 * | |<----------------------------------| |------+ 2876 * +--->| Closed | TO* | Opened | sca | 2877 * | | |-----+ +-------| |<-----+ 2878 * | +--------+ irc | | +---------+ 2879 * | ^ | | ^ 2880 * | | | | | 2881 * | | | | | 2882 * | TO-| | | | 2883 * | |tld TO+ V | | 2884 * | | +------->+ | | 2885 * | | | | | | 2886 * | +--------+ V | | 2887 * | | |<----+<--------------------+ | 2888 * | | Req- | scr | 2889 * | | Sent | | 2890 * | | | | 2891 * | +--------+ | 2892 * | RCA- | | RCA+ | 2893 * +------+ +------------------------------------------+ 2894 * scn,tld sca,irc,ict,tlu 2895 * 2896 * 2897 * with: 2898 * 2899 * Open: LCP reached authentication phase 2900 * Close: LCP reached terminate phase 2901 * 2902 * RCA+: received reply (pap-req, chap-response), acceptable 2903 * RCN: received reply (pap-req, chap-response), not acceptable 2904 * TO+: timeout with restart counter >= 0 2905 * TO-: timeout with restart counter < 0 2906 * TO*: reschedule timeout for CHAP 2907 * 2908 * scr: send request packet (none for PAP, chap-challenge) 2909 * sca: send ack packet (pap-ack, chap-success) 2910 * scn: send nak packet (pap-nak, chap-failure) 2911 * ict: initialize re-challenge timer (CHAP only) 2912 * 2913 * tlu: this-layer-up, LCP reaches network phase 2914 * tld: this-layer-down, LCP enters terminate phase 2915 * 2916 * Note that in CHAP mode, after sending a new challenge, while the state 2917 * automaton falls back into Req-Sent state, it doesn't signal a tld 2918 * event to LCP, so LCP remains in network phase. Only after not getting 2919 * any response (or after getting an unacceptable response), CHAP closes, 2920 * causing LCP to enter terminate phase. 2921 * 2922 * With PAP, there is no initial request that can be sent. The peer is 2923 * expected to send one based on the successful negotiation of PAP as 2924 * the authentication protocol during the LCP option negotiation. 2925 * 2926 * Incoming authentication protocol requests (remote requests 2927 * authentication, we are peer) don't employ a state machine at all, 2928 * they are simply answered. Some peers [Ascend P50 firmware rev 2929 * 4.50] react allergically when sending IPCP requests while they are 2930 * still in authentication phase (thereby violating the standard that 2931 * demands that these NCP packets are to be discarded), so we keep 2932 * track of the peer demanding us to authenticate, and only proceed to 2933 * phase network once we've seen a positive acknowledge for the 2934 * authentication. 2935 */ 2936 2937/* 2938 * Handle incoming CHAP packets. 2939 */ 2940void 2941sppp_chap_input(struct sppp *sp, struct mbuf *m) 2942{ 2943 STDDCL; 2944 struct lcp_header *h; 2945 int len, x; 2946 u_char *value, *name, digest[AUTHKEYLEN], dsize; 2947 int value_len, name_len; 2948 MD5_CTX ctx; 2949 2950 len = m->m_pkthdr.len; 2951 if (len < 4) { 2952 if (debug) 2953 log(LOG_DEBUG, 2954 SPP_FMT "chap invalid packet length: %d bytes\n", 2955 SPP_ARGS(ifp), len); 2956 return; 2957 } 2958 h = mtod (m, struct lcp_header*); 2959 if (len > ntohs (h->len)) 2960 len = ntohs (h->len); 2961 2962 switch (h->type) { 2963 /* challenge, failure and success are his authproto */ 2964 case CHAP_CHALLENGE: 2965 value = 1 + (u_char*)(h+1); 2966 value_len = value[-1]; 2967 name = value + value_len; 2968 name_len = len - value_len - 5; 2969 if (name_len < 0) { 2970 if (debug) { 2971 log(LOG_DEBUG, 2972 SPP_FMT "chap corrupted challenge " 2973 "<%s id=0x%x len=%d", 2974 SPP_ARGS(ifp), 2975 sppp_auth_type_name(PPP_CHAP, h->type), 2976 h->ident, ntohs(h->len)); 2977 if (len > 4) 2978 sppp_print_bytes((u_char*) (h+1), len-4); 2979 addlog(">\n"); 2980 } 2981 break; 2982 } 2983 2984 if (debug) { 2985 log(LOG_DEBUG, 2986 SPP_FMT "chap input <%s id=0x%x len=%d name=", 2987 SPP_ARGS(ifp), 2988 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 2989 ntohs(h->len)); 2990 sppp_print_string((char*) name, name_len); 2991 addlog(" value-size=%d value=", value_len); 2992 sppp_print_bytes(value, value_len); 2993 addlog(">\n"); 2994 } 2995 2996 /* Compute reply value. */ 2997 MD5Init(&ctx); 2998 MD5Update(&ctx, &h->ident, 1); 2999 MD5Update(&ctx, sp->myauth.secret, 3000 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3001 MD5Update(&ctx, value, value_len); 3002 MD5Final(digest, &ctx); 3003 dsize = sizeof digest; 3004 3005 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3006 sizeof dsize, (const char *)&dsize, 3007 sizeof digest, digest, 3008 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3009 sp->myauth.name, 3010 0); 3011 break; 3012 3013 case CHAP_SUCCESS: 3014 if (debug) { 3015 log(LOG_DEBUG, SPP_FMT "chap success", 3016 SPP_ARGS(ifp)); 3017 if (len > 4) { 3018 addlog(": "); 3019 sppp_print_string((char*)(h + 1), len - 4); 3020 } 3021 addlog("\n"); 3022 } 3023 x = splimp(); 3024 sp->pp_flags &= ~PP_NEEDAUTH; 3025 if (sp->myauth.proto == PPP_CHAP && 3026 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3027 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3028 /* 3029 * We are authenticator for CHAP but didn't 3030 * complete yet. Leave it to tlu to proceed 3031 * to network phase. 3032 */ 3033 splx(x); 3034 break; 3035 } 3036 splx(x); 3037 sppp_phase_network(sp); 3038 break; 3039 3040 case CHAP_FAILURE: 3041 if (debug) { 3042 log(LOG_INFO, SPP_FMT "chap failure", 3043 SPP_ARGS(ifp)); 3044 if (len > 4) { 3045 addlog(": "); 3046 sppp_print_string((char*)(h + 1), len - 4); 3047 } 3048 addlog("\n"); 3049 } else 3050 log(LOG_INFO, SPP_FMT "chap failure\n", 3051 SPP_ARGS(ifp)); 3052 /* await LCP shutdown by authenticator */ 3053 break; 3054 3055 /* response is my authproto */ 3056 case CHAP_RESPONSE: 3057 value = 1 + (u_char*)(h+1); 3058 value_len = value[-1]; 3059 name = value + value_len; 3060 name_len = len - value_len - 5; 3061 if (name_len < 0) { 3062 if (debug) { 3063 log(LOG_DEBUG, 3064 SPP_FMT "chap corrupted response " 3065 "<%s id=0x%x len=%d", 3066 SPP_ARGS(ifp), 3067 sppp_auth_type_name(PPP_CHAP, h->type), 3068 h->ident, ntohs(h->len)); 3069 if (len > 4) 3070 sppp_print_bytes((u_char*)(h+1), len-4); 3071 addlog(">\n"); 3072 } 3073 break; 3074 } 3075 if (h->ident != sp->confid[IDX_CHAP]) { 3076 if (debug) 3077 log(LOG_DEBUG, 3078 SPP_FMT "chap dropping response for old ID " 3079 "(got %d, expected %d)\n", 3080 SPP_ARGS(ifp), 3081 h->ident, sp->confid[IDX_CHAP]); 3082 break; 3083 } 3084 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3085 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3086 log(LOG_INFO, SPP_FMT "chap response, his name ", 3087 SPP_ARGS(ifp)); 3088 sppp_print_string(name, name_len); 3089 addlog(" != expected "); 3090 sppp_print_string(sp->hisauth.name, 3091 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3092 addlog("\n"); 3093 } 3094 if (debug) { 3095 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3096 "<%s id=0x%x len=%d name=", 3097 SPP_ARGS(ifp), 3098 sppp_state_name(sp->state[IDX_CHAP]), 3099 sppp_auth_type_name(PPP_CHAP, h->type), 3100 h->ident, ntohs (h->len)); 3101 sppp_print_string((char*)name, name_len); 3102 addlog(" value-size=%d value=", value_len); 3103 sppp_print_bytes(value, value_len); 3104 addlog(">\n"); 3105 } 3106 if (value_len != AUTHKEYLEN) { 3107 if (debug) 3108 log(LOG_DEBUG, 3109 SPP_FMT "chap bad hash value length: " 3110 "%d bytes, should be %d\n", 3111 SPP_ARGS(ifp), value_len, 3112 AUTHKEYLEN); 3113 break; 3114 } 3115 3116 MD5Init(&ctx); 3117 MD5Update(&ctx, &h->ident, 1); 3118 MD5Update(&ctx, sp->hisauth.secret, 3119 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3120 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3121 MD5Final(digest, &ctx); 3122 3123#define FAILMSG "Failed..." 3124#define SUCCMSG "Welcome!" 3125 3126 if (value_len != sizeof digest || 3127 bcmp(digest, value, value_len) != 0) { 3128 /* action scn, tld */ 3129 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3130 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3131 0); 3132 chap.tld(sp); 3133 break; 3134 } 3135 /* action sca, perhaps tlu */ 3136 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3137 sp->state[IDX_CHAP] == STATE_OPENED) 3138 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3139 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3140 0); 3141 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3142 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3143 chap.tlu(sp); 3144 } 3145 break; 3146 3147 default: 3148 /* Unknown CHAP packet type -- ignore. */ 3149 if (debug) { 3150 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3151 "<0x%x id=0x%xh len=%d", 3152 SPP_ARGS(ifp), 3153 sppp_state_name(sp->state[IDX_CHAP]), 3154 h->type, h->ident, ntohs(h->len)); 3155 if (len > 4) 3156 sppp_print_bytes((u_char*)(h+1), len-4); 3157 addlog(">\n"); 3158 } 3159 break; 3160 3161 } 3162} 3163 3164static void 3165sppp_chap_init(struct sppp *sp) 3166{ 3167 /* Chap doesn't have STATE_INITIAL at all. */ 3168 sp->state[IDX_CHAP] = STATE_CLOSED; 3169 sp->fail_counter[IDX_CHAP] = 0; 3170#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3171 callout_handle_init(&sp->ch[IDX_CHAP]); 3172#endif 3173} 3174 3175static void 3176sppp_chap_open(struct sppp *sp) 3177{ 3178 if (sp->myauth.proto == PPP_CHAP && 3179 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3180 /* we are authenticator for CHAP, start it */ 3181 chap.scr(sp); 3182 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3183 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3184 } 3185 /* nothing to be done if we are peer, await a challenge */ 3186} 3187 3188static void 3189sppp_chap_close(struct sppp *sp) 3190{ 3191 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3192 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3193} 3194 3195static void 3196sppp_chap_TO(void *cookie) 3197{ 3198 struct sppp *sp = (struct sppp *)cookie; 3199 STDDCL; 3200 int s; 3201 3202 s = splimp(); 3203 if (debug) 3204 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3205 SPP_ARGS(ifp), 3206 sppp_state_name(sp->state[IDX_CHAP]), 3207 sp->rst_counter[IDX_CHAP]); 3208 3209 if (--sp->rst_counter[IDX_CHAP] < 0) 3210 /* TO- event */ 3211 switch (sp->state[IDX_CHAP]) { 3212 case STATE_REQ_SENT: 3213 chap.tld(sp); 3214 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3215 break; 3216 } 3217 else 3218 /* TO+ (or TO*) event */ 3219 switch (sp->state[IDX_CHAP]) { 3220 case STATE_OPENED: 3221 /* TO* event */ 3222 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3223 /* fall through */ 3224 case STATE_REQ_SENT: 3225 chap.scr(sp); 3226 /* sppp_cp_change_state() will restart the timer */ 3227 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3228 break; 3229 } 3230 3231 splx(s); 3232} 3233 3234static void 3235sppp_chap_tlu(struct sppp *sp) 3236{ 3237 STDDCL; 3238 int i, x; 3239 3240 i = 0; 3241 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3242 3243 /* 3244 * Some broken CHAP implementations (Conware CoNet, firmware 3245 * 4.0.?) don't want to re-authenticate their CHAP once the 3246 * initial challenge-response exchange has taken place. 3247 * Provide for an option to avoid rechallenges. 3248 */ 3249 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3250 /* 3251 * Compute the re-challenge timeout. This will yield 3252 * a number between 300 and 810 seconds. 3253 */ 3254 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3255 TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]); 3256 } 3257 3258 if (debug) { 3259 log(LOG_DEBUG, 3260 SPP_FMT "chap %s, ", 3261 SPP_ARGS(ifp), 3262 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3263 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3264 addlog("next re-challenge in %d seconds\n", i); 3265 else 3266 addlog("re-challenging supressed\n"); 3267 } 3268 3269 x = splimp(); 3270 /* indicate to LCP that we need to be closed down */ 3271 sp->lcp.protos |= (1 << IDX_CHAP); 3272 3273 if (sp->pp_flags & PP_NEEDAUTH) { 3274 /* 3275 * Remote is authenticator, but his auth proto didn't 3276 * complete yet. Defer the transition to network 3277 * phase. 3278 */ 3279 splx(x); 3280 return; 3281 } 3282 splx(x); 3283 3284 /* 3285 * If we are already in phase network, we are done here. This 3286 * is the case if this is a dummy tlu event after a re-challenge. 3287 */ 3288 if (sp->pp_phase != PHASE_NETWORK) 3289 sppp_phase_network(sp); 3290} 3291 3292static void 3293sppp_chap_tld(struct sppp *sp) 3294{ 3295 STDDCL; 3296 3297 if (debug) 3298 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 3299 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 3300 sp->lcp.protos &= ~(1 << IDX_CHAP); 3301 3302 lcp.Close(sp); 3303} 3304 3305static void 3306sppp_chap_scr(struct sppp *sp) 3307{ 3308 u_long *ch, seed; 3309 u_char clen; 3310#if defined (__NetBSD__) || defined (__OpenBSD__) 3311 struct timeval tv; 3312#endif 3313 3314 /* Compute random challenge. */ 3315 ch = (u_long *)sp->myauth.challenge; 3316#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3317 read_random(&seed, sizeof seed); 3318#else 3319 microtime(&tv); 3320 seed = tv.tv_sec ^ tv.tv_usec; 3321#endif 3322 ch[0] = seed ^ random(); 3323 ch[1] = seed ^ random(); 3324 ch[2] = seed ^ random(); 3325 ch[3] = seed ^ random(); 3326 clen = AUTHKEYLEN; 3327 3328 sp->confid[IDX_CHAP] = ++sp->pp_seq; 3329 3330 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 3331 sizeof clen, (const char *)&clen, 3332 (size_t)AUTHKEYLEN, sp->myauth.challenge, 3333 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3334 sp->myauth.name, 3335 0); 3336} 3337 /* 3338 *--------------------------------------------------------------------------* 3339 * * 3340 * The PAP implementation. * 3341 * * 3342 *--------------------------------------------------------------------------* 3343 */ 3344/* 3345 * For PAP, we need to keep a little state also if we are the peer, not the 3346 * authenticator. This is since we don't get a request to authenticate, but 3347 * have to repeatedly authenticate ourself until we got a response (or the 3348 * retry counter is expired). 3349 */ 3350 3351/* 3352 * Handle incoming PAP packets. */ 3353static void 3354sppp_pap_input(struct sppp *sp, struct mbuf *m) 3355{ 3356 STDDCL; 3357 struct lcp_header *h; 3358 int len, x; 3359 u_char *name, *passwd, mlen; 3360 int name_len, passwd_len; 3361 3362 len = m->m_pkthdr.len; 3363 if (len < 5) { 3364 if (debug) 3365 log(LOG_DEBUG, 3366 SPP_FMT "pap invalid packet length: %d bytes\n", 3367 SPP_ARGS(ifp), len); 3368 return; 3369 } 3370 h = mtod (m, struct lcp_header*); 3371 if (len > ntohs (h->len)) 3372 len = ntohs (h->len); 3373 switch (h->type) { 3374 /* PAP request is my authproto */ 3375 case PAP_REQ: 3376 name = 1 + (u_char*)(h+1); 3377 name_len = name[-1]; 3378 passwd = name + name_len + 1; 3379 if (name_len > len - 6 || 3380 (passwd_len = passwd[-1]) > len - 6 - name_len) { 3381 if (debug) { 3382 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 3383 "<%s id=0x%x len=%d", 3384 SPP_ARGS(ifp), 3385 sppp_auth_type_name(PPP_PAP, h->type), 3386 h->ident, ntohs(h->len)); 3387 if (len > 4) 3388 sppp_print_bytes((u_char*)(h+1), len-4); 3389 addlog(">\n"); 3390 } 3391 break; 3392 } 3393 if (debug) { 3394 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 3395 "<%s id=0x%x len=%d name=", 3396 SPP_ARGS(ifp), 3397 sppp_state_name(sp->state[IDX_PAP]), 3398 sppp_auth_type_name(PPP_PAP, h->type), 3399 h->ident, ntohs(h->len)); 3400 sppp_print_string((char*)name, name_len); 3401 addlog(" passwd="); 3402 sppp_print_string((char*)passwd, passwd_len); 3403 addlog(">\n"); 3404 } 3405 if (name_len > AUTHNAMELEN || 3406 passwd_len > AUTHKEYLEN || 3407 bcmp(name, sp->hisauth.name, name_len) != 0 || 3408 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 3409 /* action scn, tld */ 3410 mlen = sizeof(FAILMSG) - 1; 3411 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 3412 sizeof mlen, (const char *)&mlen, 3413 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3414 0); 3415 pap.tld(sp); 3416 break; 3417 } 3418 /* action sca, perhaps tlu */ 3419 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 3420 sp->state[IDX_PAP] == STATE_OPENED) { 3421 mlen = sizeof(SUCCMSG) - 1; 3422 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 3423 sizeof mlen, (const char *)&mlen, 3424 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3425 0); 3426 } 3427 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 3428 sppp_cp_change_state(&pap, sp, STATE_OPENED); 3429 pap.tlu(sp); 3430 } 3431 break; 3432 3433 /* ack and nak are his authproto */ 3434 case PAP_ACK: 3435 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3436 if (debug) { 3437 log(LOG_DEBUG, SPP_FMT "pap success", 3438 SPP_ARGS(ifp)); 3439 name_len = *((char *)h); 3440 if (len > 5 && name_len) { 3441 addlog(": "); 3442 sppp_print_string((char*)(h+1), name_len); 3443 } 3444 addlog("\n"); 3445 } 3446 x = splimp(); 3447 sp->pp_flags &= ~PP_NEEDAUTH; 3448 if (sp->myauth.proto == PPP_PAP && 3449 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3450 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 3451 /* 3452 * We are authenticator for PAP but didn't 3453 * complete yet. Leave it to tlu to proceed 3454 * to network phase. 3455 */ 3456 splx(x); 3457 break; 3458 } 3459 splx(x); 3460 sppp_phase_network(sp); 3461 break; 3462 3463 case PAP_NAK: 3464 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3465 if (debug) { 3466 log(LOG_INFO, SPP_FMT "pap failure", 3467 SPP_ARGS(ifp)); 3468 name_len = *((char *)h); 3469 if (len > 5 && name_len) { 3470 addlog(": "); 3471 sppp_print_string((char*)(h+1), name_len); 3472 } 3473 addlog("\n"); 3474 } else 3475 log(LOG_INFO, SPP_FMT "pap failure\n", 3476 SPP_ARGS(ifp)); 3477 /* await LCP shutdown by authenticator */ 3478 break; 3479 3480 default: 3481 /* Unknown PAP packet type -- ignore. */ 3482 if (debug) { 3483 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 3484 "<0x%x id=0x%x len=%d", 3485 SPP_ARGS(ifp), 3486 h->type, h->ident, ntohs(h->len)); 3487 if (len > 4) 3488 sppp_print_bytes((u_char*)(h+1), len-4); 3489 addlog(">\n"); 3490 } 3491 break; 3492 3493 } 3494} 3495 3496static void 3497sppp_pap_init(struct sppp *sp) 3498{ 3499 /* PAP doesn't have STATE_INITIAL at all. */ 3500 sp->state[IDX_PAP] = STATE_CLOSED; 3501 sp->fail_counter[IDX_PAP] = 0; 3502#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3503 callout_handle_init(&sp->ch[IDX_PAP]); 3504 callout_handle_init(&sp->pap_my_to_ch); 3505#endif 3506} 3507 3508static void 3509sppp_pap_open(struct sppp *sp) 3510{ 3511 if (sp->hisauth.proto == PPP_PAP && 3512 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3513 /* we are authenticator for PAP, start our timer */ 3514 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 3515 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 3516 } 3517 if (sp->myauth.proto == PPP_PAP) { 3518 /* we are peer, send a request, and start a timer */ 3519 pap.scr(sp); 3520 TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout, 3521 sp->pap_my_to_ch); 3522 } 3523} 3524 3525static void 3526sppp_pap_close(struct sppp *sp) 3527{ 3528 if (sp->state[IDX_PAP] != STATE_CLOSED) 3529 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 3530} 3531 3532/* 3533 * That's the timeout routine if we are authenticator. Since the 3534 * authenticator is basically passive in PAP, we can't do much here. 3535 */ 3536static void 3537sppp_pap_TO(void *cookie) 3538{ 3539 struct sppp *sp = (struct sppp *)cookie; 3540 STDDCL; 3541 int s; 3542 3543 s = splimp(); 3544 if (debug) 3545 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 3546 SPP_ARGS(ifp), 3547 sppp_state_name(sp->state[IDX_PAP]), 3548 sp->rst_counter[IDX_PAP]); 3549 3550 if (--sp->rst_counter[IDX_PAP] < 0) 3551 /* TO- event */ 3552 switch (sp->state[IDX_PAP]) { 3553 case STATE_REQ_SENT: 3554 pap.tld(sp); 3555 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 3556 break; 3557 } 3558 else 3559 /* TO+ event, not very much we could do */ 3560 switch (sp->state[IDX_PAP]) { 3561 case STATE_REQ_SENT: 3562 /* sppp_cp_change_state() will restart the timer */ 3563 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 3564 break; 3565 } 3566 3567 splx(s); 3568} 3569 3570/* 3571 * That's the timeout handler if we are peer. Since the peer is active, 3572 * we need to retransmit our PAP request since it is apparently lost. 3573 * XXX We should impose a max counter. 3574 */ 3575static void 3576sppp_pap_my_TO(void *cookie) 3577{ 3578 struct sppp *sp = (struct sppp *)cookie; 3579 STDDCL; 3580 3581 if (debug) 3582 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 3583 SPP_ARGS(ifp)); 3584 3585 pap.scr(sp); 3586} 3587 3588static void 3589sppp_pap_tlu(struct sppp *sp) 3590{ 3591 STDDCL; 3592 int x; 3593 3594 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 3595 3596 if (debug) 3597 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 3598 SPP_ARGS(ifp), pap.name); 3599 3600 x = splimp(); 3601 /* indicate to LCP that we need to be closed down */ 3602 sp->lcp.protos |= (1 << IDX_PAP); 3603 3604 if (sp->pp_flags & PP_NEEDAUTH) { 3605 /* 3606 * Remote is authenticator, but his auth proto didn't 3607 * complete yet. Defer the transition to network 3608 * phase. 3609 */ 3610 splx(x); 3611 return; 3612 } 3613 splx(x); 3614 sppp_phase_network(sp); 3615} 3616 3617static void 3618sppp_pap_tld(struct sppp *sp) 3619{ 3620 STDDCL; 3621 3622 if (debug) 3623 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 3624 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 3625 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 3626 sp->lcp.protos &= ~(1 << IDX_PAP); 3627 3628 lcp.Close(sp); 3629} 3630 3631static void 3632sppp_pap_scr(struct sppp *sp) 3633{ 3634 u_char idlen, pwdlen; 3635 3636 sp->confid[IDX_PAP] = ++sp->pp_seq; 3637 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 3638 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 3639 3640 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 3641 sizeof idlen, (const char *)&idlen, 3642 (size_t)idlen, sp->myauth.name, 3643 sizeof pwdlen, (const char *)&pwdlen, 3644 (size_t)pwdlen, sp->myauth.secret, 3645 0); 3646} 3647 /* 3648 * Random miscellaneous functions. 3649 */ 3650 3651/* 3652 * Send a PAP or CHAP proto packet. 3653 * 3654 * Varadic function, each of the elements for the ellipsis is of type 3655 * ``size_t mlen, const u_char *msg''. Processing will stop iff 3656 * mlen == 0. 3657 */ 3658 3659static void 3660sppp_auth_send(const struct cp *cp, struct sppp *sp, u_char type, u_char id, 3661 ...) 3662{ 3663 STDDCL; 3664 struct ppp_header *h; 3665 struct lcp_header *lh; 3666 struct mbuf *m; 3667 u_char *p; 3668 int len; 3669 size_t mlen; 3670 const char *msg; 3671 va_list ap; 3672 3673 MGETHDR (m, M_DONTWAIT, MT_DATA); 3674 if (! m) 3675 return; 3676 m->m_pkthdr.rcvif = 0; 3677 3678 h = mtod (m, struct ppp_header*); 3679 h->address = PPP_ALLSTATIONS; /* broadcast address */ 3680 h->control = PPP_UI; /* Unnumbered Info */ 3681 h->protocol = htons(cp->proto); 3682 3683 lh = (struct lcp_header*)(h + 1); 3684 lh->type = type; 3685 lh->ident = id; 3686 p = (u_char*) (lh+1); 3687 3688 va_start(ap, id); 3689 len = 0; 3690 3691 while ((mlen = va_arg(ap, size_t)) != 0) { 3692 msg = va_arg(ap, const char *); 3693 len += mlen; 3694 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 3695 va_end(ap); 3696 m_freem(m); 3697 return; 3698 } 3699 3700 bcopy(msg, p, mlen); 3701 p += mlen; 3702 } 3703 va_end(ap); 3704 3705 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 3706 lh->len = htons (LCP_HEADER_LEN + len); 3707 3708 if (debug) { 3709 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 3710 SPP_ARGS(ifp), cp->name, 3711 sppp_auth_type_name(cp->proto, lh->type), 3712 lh->ident, ntohs(lh->len)); 3713 if (len) 3714 sppp_print_bytes((u_char*) (lh+1), len); 3715 addlog(">\n"); 3716 } 3717 if (IF_QFULL (&sp->pp_cpq)) { 3718 IF_DROP (&sp->pp_fastq); 3719 IF_DROP (&ifp->if_snd); 3720 m_freem (m); 3721 ++ifp->if_oerrors; 3722 } else 3723 IF_ENQUEUE (&sp->pp_cpq, m); 3724 if (! (ifp->if_flags & IFF_OACTIVE)) 3725 (*ifp->if_start) (ifp); 3726 ifp->if_obytes += m->m_pkthdr.len + 3; 3727} 3728 3729/* 3730 * Flush interface queue. 3731 */ 3732static void 3733sppp_qflush(struct ifqueue *ifq) 3734{ 3735 struct mbuf *m, *n; 3736 3737 n = ifq->ifq_head; 3738 while ((m = n)) { 3739 n = m->m_act; 3740 m_freem (m); 3741 } 3742 ifq->ifq_head = 0; 3743 ifq->ifq_tail = 0; 3744 ifq->ifq_len = 0; 3745} 3746 3747/* 3748 * Send keepalive packets, every 10 seconds. 3749 */ 3750static void 3751sppp_keepalive(void *dummy) 3752{ 3753 struct sppp *sp; 3754 int s; 3755 3756 s = splimp(); 3757 for (sp=spppq; sp; sp=sp->pp_next) { 3758 struct ifnet *ifp = &sp->pp_if; 3759 3760 /* Keepalive mode disabled or channel down? */ 3761 if (! (sp->pp_flags & PP_KEEPALIVE) || 3762 ! (ifp->if_flags & IFF_RUNNING)) 3763 continue; 3764 3765 /* No keepalive in PPP mode if LCP not opened yet. */ 3766 if (! (sp->pp_flags & PP_CISCO) && 3767 sp->pp_phase < PHASE_AUTHENTICATE) 3768 continue; 3769 3770 if (sp->pp_alivecnt == MAXALIVECNT) { 3771 /* No keepalive packets got. Stop the interface. */ 3772 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 3773 if_down (ifp); 3774 sppp_qflush (&sp->pp_cpq); 3775 if (! (sp->pp_flags & PP_CISCO)) { 3776 /* XXX */ 3777 /* Shut down the PPP link. */ 3778 lcp.Down(sp); 3779 /* Initiate negotiation. XXX */ 3780 lcp.Up(sp); 3781 } 3782 } 3783 if (sp->pp_alivecnt <= MAXALIVECNT) 3784 ++sp->pp_alivecnt; 3785 if (sp->pp_flags & PP_CISCO) 3786 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, 3787 sp->pp_rseq); 3788 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 3789 long nmagic = htonl (sp->lcp.magic); 3790 sp->lcp.echoid = ++sp->pp_seq; 3791 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 3792 sp->lcp.echoid, 4, &nmagic); 3793 } 3794 } 3795 splx(s); 3796 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 3797} 3798 3799/* 3800 * Get both IP addresses. 3801 */ 3802static void 3803sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 3804{ 3805 struct ifnet *ifp = &sp->pp_if; 3806 struct ifaddr *ifa; 3807 struct sockaddr_in *si, *sm; 3808 u_long ssrc, ddst; 3809 3810 sm = NULL; 3811 ssrc = ddst = 0L; 3812 /* 3813 * Pick the first AF_INET address from the list, 3814 * aliases don't make any sense on a p2p link anyway. 3815 */ 3816 si = 0; 3817#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3818 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 3819#else 3820 for (ifa = ifp->if_addrlist.tqh_first; 3821 ifa; 3822 ifa = ifa->ifa_list.tqe_next) 3823#endif 3824 if (ifa->ifa_addr->sa_family == AF_INET) { 3825 si = (struct sockaddr_in *)ifa->ifa_addr; 3826 sm = (struct sockaddr_in *)ifa->ifa_netmask; 3827 if (si) 3828 break; 3829 } 3830 if (ifa) { 3831 if (si && si->sin_addr.s_addr) { 3832 ssrc = si->sin_addr.s_addr; 3833 if (srcmask) 3834 *srcmask = ntohl(sm->sin_addr.s_addr); 3835 } 3836 3837 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 3838 if (si && si->sin_addr.s_addr) 3839 ddst = si->sin_addr.s_addr; 3840 } 3841 3842 if (dst) *dst = ntohl(ddst); 3843 if (src) *src = ntohl(ssrc); 3844} 3845 3846/* 3847 * Set my IP address. Must be called at splimp. 3848 */ 3849static void 3850sppp_set_ip_addr(struct sppp *sp, u_long src) 3851{ 3852 struct ifnet *ifp = &sp->pp_if; 3853 struct ifaddr *ifa; 3854 struct sockaddr_in *si; 3855 3856 /* 3857 * Pick the first AF_INET address from the list, 3858 * aliases don't make any sense on a p2p link anyway. 3859 */ 3860 3861 si = 0; 3862#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3863 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 3864#else 3865 for (ifa = ifp->if_addrlist.tqh_first; 3866 ifa; 3867 ifa = ifa->ifa_list.tqe_next) 3868#endif 3869 { 3870 if (ifa->ifa_addr->sa_family == AF_INET) 3871 { 3872 si = (struct sockaddr_in *)ifa->ifa_addr; 3873 if (si) 3874 break; 3875 } 3876 } 3877 3878 if (ifa && si) 3879 si->sin_addr.s_addr = htonl(src); 3880} 3881 3882static int 3883sppp_params(struct sppp *sp, u_long cmd, void *data) 3884{ 3885 u_long subcmd; 3886 struct ifreq *ifr = (struct ifreq *)data; 3887 struct spppreq spr; 3888 3889 /* 3890 * ifr->ifr_data is supposed to point to a struct spppreq. 3891 * Check the cmd word first before attempting to fetch all the 3892 * data. 3893 */ 3894 if ((subcmd = fuword(ifr->ifr_data)) == -1) 3895 return EFAULT; 3896 3897 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 3898 return EFAULT; 3899 3900 switch (subcmd) { 3901 case SPPPIOGDEFS: 3902 if (cmd != SIOCGIFGENERIC) 3903 return EINVAL; 3904 /* 3905 * We copy over the entire current state, but clean 3906 * out some of the stuff we don't wanna pass up. 3907 * Remember, SIOCGIFGENERIC is unprotected, and can be 3908 * called by any user. No need to ever get PAP or 3909 * CHAP secrets back to userland anyway. 3910 */ 3911 bcopy(sp, &spr.defs, sizeof(struct sppp)); 3912 bzero(spr.defs.myauth.secret, AUTHKEYLEN); 3913 bzero(spr.defs.myauth.challenge, AUTHKEYLEN); 3914 bzero(spr.defs.hisauth.secret, AUTHKEYLEN); 3915 bzero(spr.defs.hisauth.challenge, AUTHKEYLEN); 3916 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 3917 3918 case SPPPIOSDEFS: 3919 if (cmd != SIOCSIFGENERIC) 3920 return EINVAL; 3921 /* 3922 * We have a very specific idea of which fields we allow 3923 * being passed back from userland, so to not clobber our 3924 * current state. For one, we only allow setting 3925 * anything if LCP is in dead phase. Once the LCP 3926 * negotiations started, the authentication settings must 3927 * not be changed again. (The administrator can force an 3928 * ifconfig down in order to get LCP back into dead 3929 * phase.) 3930 * 3931 * Also, we only allow for authentication parameters to be 3932 * specified. 3933 * 3934 * XXX Should allow to set or clear pp_flags. 3935 * 3936 * Finally, if the respective authentication protocol to 3937 * be used is set differently than 0, but the secret is 3938 * passed as all zeros, we don't trash the existing secret. 3939 * This allows an administrator to change the system name 3940 * only without clobbering the secret (which he didn't get 3941 * back in a previous SPPPIOGDEFS call). However, the 3942 * secrets are cleared if the authentication protocol is 3943 * reset to 0. 3944 */ 3945 if (sp->pp_phase != PHASE_DEAD) 3946 return EBUSY; 3947 3948 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 3949 spr.defs.myauth.proto != PPP_CHAP) || 3950 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 3951 spr.defs.hisauth.proto != PPP_CHAP)) 3952 return EINVAL; 3953 3954 if (spr.defs.myauth.proto == 0) 3955 /* resetting myauth */ 3956 bzero(&sp->myauth, sizeof sp->myauth); 3957 else { 3958 /* setting/changing myauth */ 3959 sp->myauth.proto = spr.defs.myauth.proto; 3960 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 3961 if (spr.defs.myauth.secret[0] != '\0') 3962 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 3963 AUTHKEYLEN); 3964 } 3965 if (spr.defs.hisauth.proto == 0) 3966 /* resetting hisauth */ 3967 bzero(&sp->hisauth, sizeof sp->hisauth); 3968 else { 3969 /* setting/changing hisauth */ 3970 sp->hisauth.proto = spr.defs.hisauth.proto; 3971 sp->hisauth.flags = spr.defs.hisauth.flags; 3972 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 3973 if (spr.defs.hisauth.secret[0] != '\0') 3974 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 3975 AUTHKEYLEN); 3976 } 3977 break; 3978 3979 default: 3980 return EINVAL; 3981 } 3982 3983 return 0; 3984} 3985 3986static void 3987sppp_phase_network(struct sppp *sp) 3988{ 3989 STDDCL; 3990 int i; 3991 u_long mask; 3992 3993 sp->pp_phase = PHASE_NETWORK; 3994 3995 if (debug) 3996 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 3997 sppp_phase_name(sp->pp_phase)); 3998 3999 /* Notify NCPs now. */ 4000 for (i = 0; i < IDX_COUNT; i++) 4001 if ((cps[i])->flags & CP_NCP) 4002 (cps[i])->Open(sp); 4003 4004 /* Send Up events to all NCPs. */ 4005 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4006 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP)) 4007 (cps[i])->Up(sp); 4008 4009 /* if no NCP is starting, all this was in vain, close down */ 4010 sppp_lcp_check_and_close(sp); 4011} 4012 4013 4014static const char * 4015sppp_cp_type_name(u_char type) 4016{ 4017 static char buf[12]; 4018 switch (type) { 4019 case CONF_REQ: return "conf-req"; 4020 case CONF_ACK: return "conf-ack"; 4021 case CONF_NAK: return "conf-nak"; 4022 case CONF_REJ: return "conf-rej"; 4023 case TERM_REQ: return "term-req"; 4024 case TERM_ACK: return "term-ack"; 4025 case CODE_REJ: return "code-rej"; 4026 case PROTO_REJ: return "proto-rej"; 4027 case ECHO_REQ: return "echo-req"; 4028 case ECHO_REPLY: return "echo-reply"; 4029 case DISC_REQ: return "discard-req"; 4030 } 4031 snprintf (buf, sizeof(buf), "0x%x", type); 4032 return buf; 4033} 4034 4035static const char * 4036sppp_auth_type_name(u_short proto, u_char type) 4037{ 4038 static char buf[12]; 4039 switch (proto) { 4040 case PPP_CHAP: 4041 switch (type) { 4042 case CHAP_CHALLENGE: return "challenge"; 4043 case CHAP_RESPONSE: return "response"; 4044 case CHAP_SUCCESS: return "success"; 4045 case CHAP_FAILURE: return "failure"; 4046 } 4047 case PPP_PAP: 4048 switch (type) { 4049 case PAP_REQ: return "req"; 4050 case PAP_ACK: return "ack"; 4051 case PAP_NAK: return "nak"; 4052 } 4053 } 4054 snprintf (buf, sizeof(buf), "0x%x", type); 4055 return buf; 4056} 4057 4058static const char * 4059sppp_lcp_opt_name(u_char opt) 4060{ 4061 static char buf[12]; 4062 switch (opt) { 4063 case LCP_OPT_MRU: return "mru"; 4064 case LCP_OPT_ASYNC_MAP: return "async-map"; 4065 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4066 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4067 case LCP_OPT_MAGIC: return "magic"; 4068 case LCP_OPT_PROTO_COMP: return "proto-comp"; 4069 case LCP_OPT_ADDR_COMP: return "addr-comp"; 4070 } 4071 snprintf (buf, sizeof(buf), "0x%x", opt); 4072 return buf; 4073} 4074 4075static const char * 4076sppp_ipcp_opt_name(u_char opt) 4077{ 4078 static char buf[12]; 4079 switch (opt) { 4080 case IPCP_OPT_ADDRESSES: return "addresses"; 4081 case IPCP_OPT_COMPRESSION: return "compression"; 4082 case IPCP_OPT_ADDRESS: return "address"; 4083 } 4084 snprintf (buf, sizeof(buf), "0x%x", opt); 4085 return buf; 4086} 4087 4088static const char * 4089sppp_state_name(int state) 4090{ 4091 switch (state) { 4092 case STATE_INITIAL: return "initial"; 4093 case STATE_STARTING: return "starting"; 4094 case STATE_CLOSED: return "closed"; 4095 case STATE_STOPPED: return "stopped"; 4096 case STATE_CLOSING: return "closing"; 4097 case STATE_STOPPING: return "stopping"; 4098 case STATE_REQ_SENT: return "req-sent"; 4099 case STATE_ACK_RCVD: return "ack-rcvd"; 4100 case STATE_ACK_SENT: return "ack-sent"; 4101 case STATE_OPENED: return "opened"; 4102 } 4103 return "illegal"; 4104} 4105 4106static const char * 4107sppp_phase_name(enum ppp_phase phase) 4108{ 4109 switch (phase) { 4110 case PHASE_DEAD: return "dead"; 4111 case PHASE_ESTABLISH: return "establish"; 4112 case PHASE_TERMINATE: return "terminate"; 4113 case PHASE_AUTHENTICATE: return "authenticate"; 4114 case PHASE_NETWORK: return "network"; 4115 } 4116 return "illegal"; 4117} 4118 4119static const char * 4120sppp_proto_name(u_short proto) 4121{ 4122 static char buf[12]; 4123 switch (proto) { 4124 case PPP_LCP: return "lcp"; 4125 case PPP_IPCP: return "ipcp"; 4126 case PPP_PAP: return "pap"; 4127 case PPP_CHAP: return "chap"; 4128 } 4129 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 4130 return buf; 4131} 4132 4133static void 4134sppp_print_bytes(const u_char *p, u_short len) 4135{ 4136 addlog(" %02x", *p++); 4137 while (--len > 0) 4138 addlog("-%02x", *p++); 4139} 4140 4141static void 4142sppp_print_string(const char *p, u_short len) 4143{ 4144 u_char c; 4145 4146 while (len-- > 0) { 4147 c = *p++; 4148 /* 4149 * Print only ASCII chars directly. RFC 1994 recommends 4150 * using only them, but we don't rely on it. */ 4151 if (c < ' ' || c > '~') 4152 addlog("\\x%x", c); 4153 else 4154 addlog("%c", c); 4155 } 4156} 4157 4158static const char * 4159sppp_dotted_quad(u_long addr) 4160{ 4161 static char s[16]; 4162 sprintf(s, "%d.%d.%d.%d", 4163 (int)((addr >> 24) & 0xff), 4164 (int)((addr >> 16) & 0xff), 4165 (int)((addr >> 8) & 0xff), 4166 (int)(addr & 0xff)); 4167 return s; 4168} 4169 4170static int 4171sppp_strnlen(u_char *p, int max) 4172{ 4173 int len; 4174 4175 for (len = 0; len < max && *p; ++p) 4176 ++len; 4177 return len; 4178} 4179 4180/* a dummy, used to drop uninteresting events */ 4181static void 4182sppp_null(struct sppp *unused) 4183{ 4184 /* do just nothing */ 4185} 4186/* 4187 * This file is large. Tell emacs to highlight it nevertheless. 4188 * 4189 * Local Variables: 4190 * hilit-auto-highlight-maxout: 120000 4191 * End: 4192 */ 4193