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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22 /*
23 * Synchronous PPP/Cisco link level subroutines.
24 * Keepalive protocol implemented in both Cisco and PPP modes.
25 *
26 * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
27 * Author: Serge Vakulenko, <vak@cronyx.ru>
28 *
29 * Heavily revamped to conform to RFC 1661.
30 * Copyright (C) 1997, Joerg Wunsch.
31 *
32 * This software is distributed with NO WARRANTIES, not even the implied
33 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
34 *
35 * Authors grant any other persons or organisations permission to use
36 * or modify this software as long as this message is kept with the software,
37 * all derivative works or modified versions.
38 *
39 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
40 *
41 */
42
43 #include <sys/param.h>
44
45 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
46 #include "opt_inet.h"
47 #include "opt_ipx.h"
48 #endif
49
50 #ifdef NetBSD1_3
51 # if NetBSD1_3 > 6
52 # include "opt_inet.h"
53 # include "opt_iso.h"
54 # endif
55 #endif
56
57 #include <sys/systm.h>
58 #include <sys/kernel.h>
59 #include <sys/sockio.h>
60 #include <sys/socket.h>
61 #include <sys/syslog.h>
62 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
63 #include <machine/random.h>
64 #endif
65 #include <sys/malloc.h>
66 #include <sys/mbuf.h>
67
68
69 #if defined (__OpenBSD__)
70 #include <sys/md5k.h>
71 #else
72 #include <sys/md5.h>
73 #endif
74
75 #include <net/if.h>
76 #include <net/netisr.h>
77 #include <net/if_types.h>
78 #include <net/route.h>
79
80 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
81 #include <machine/random.h>
82 #endif
83 #if defined (__NetBSD__) || defined (__OpenBSD__)
84 #include <kern/cpu_number.h> /* XXX for softnet */
85 #endif
86
87 #include <machine/stdarg.h>
88
89 #if INET
90 #include <netinet/in.h>
91 #include <netinet/in_systm.h>
92 #include <netinet/in_var.h>
93 #include <netinet/ip.h>
94 #include <netinet/tcp.h>
95 # if defined (__FreeBSD__) || defined (__OpenBSD__)
96 # include <netinet/if_ether.h>
97 # else
98 # include <net/ethertypes.h>
99 # endif
100 #else
101 # error Huh? sppp without INET?
102 #endif
103
104 #if IPX
105 #include <netipx/ipx.h>
106 #include <netipx/ipx_if.h>
107 #endif
108
109 #if NS
110 #include <netns/ns.h>
111 #include <netns/ns_if.h>
112 #endif
113
114 #if ISO
115 #include <netiso/argo_debug.h>
116 #include <netiso/iso.h>
117 #include <netiso/iso_var.h>
118 #include <netiso/iso_snpac.h>
119 #endif
120
121 #include <net/if_sppp.h>
122
123 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
124 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle)
125 # define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2)
126 # define IOCTL_CMD_T u_long
127 #else
128 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg)
129 # define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2)
130 # define IOCTL_CMD_T int
131 #endif
132
133 #define MAXALIVECNT 3 /* max. alive packets */
134
135 /*
136 * Interface flags that can be set in an ifconfig command.
137 *
138 * Setting link0 will make the link passive, i.e. it will be marked
139 * as being administrative openable, but won't be opened to begin
140 * with. Incoming calls will be answered, or subsequent calls with
141 * -link1 will cause the administrative open of the LCP layer.
142 *
143 * Setting link1 will cause the link to auto-dial only as packets
144 * arrive to be sent.
145 *
146 * Setting IFF_DEBUG will syslog the option negotiation and state
147 * transitions at level kern.debug. Note: all logs consistently look
148 * like
149 *
150 * <if-name><unit>: <proto-name> <additional info...>
151 *
152 * with <if-name><unit> being something like "bppp0", and <proto-name>
153 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
154 */
155
156 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
157 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
158
159 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
160 #define PPP_UI 0x03 /* Unnumbered Information */
161 #define PPP_IP 0x0021 /* Internet Protocol */
162 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
163 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
164 #define PPP_IPX 0x002b /* Novell IPX Protocol */
165 #define PPP_LCP 0xc021 /* Link Control Protocol */
166 #define PPP_PAP 0xc023 /* Password Authentication Protocol */
167 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
168 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
169
170 #define CONF_REQ 1 /* PPP configure request */
171 #define CONF_ACK 2 /* PPP configure acknowledge */
172 #define CONF_NAK 3 /* PPP configure negative ack */
173 #define CONF_REJ 4 /* PPP configure reject */
174 #define TERM_REQ 5 /* PPP terminate request */
175 #define TERM_ACK 6 /* PPP terminate acknowledge */
176 #define CODE_REJ 7 /* PPP code reject */
177 #define PROTO_REJ 8 /* PPP protocol reject */
178 #define ECHO_REQ 9 /* PPP echo request */
179 #define ECHO_REPLY 10 /* PPP echo reply */
180 #define DISC_REQ 11 /* PPP discard request */
181
182 #define LCP_OPT_MRU 1 /* maximum receive unit */
183 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
184 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
185 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
186 #define LCP_OPT_MAGIC 5 /* magic number */
187 #define LCP_OPT_RESERVED 6 /* reserved */
188 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
189 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
190
191 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
192 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
193 #define IPCP_OPT_ADDRESS 3 /* local IP address */
194
195 #define PAP_REQ 1 /* PAP name/password request */
196 #define PAP_ACK 2 /* PAP acknowledge */
197 #define PAP_NAK 3 /* PAP fail */
198
199 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
200 #define CHAP_RESPONSE 2 /* CHAP challenge response */
201 #define CHAP_SUCCESS 3 /* CHAP response ok */
202 #define CHAP_FAILURE 4 /* CHAP response failed */
203
204 #define CHAP_MD5 5 /* hash algorithm - MD5 */
205
206 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
207 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
208 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
209 #define CISCO_ADDR_REQ 0 /* Cisco address request */
210 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
211 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
212
213 /* states are named and numbered according to RFC 1661 */
214 #define STATE_INITIAL 0
215 #define STATE_STARTING 1
216 #define STATE_CLOSED 2
217 #define STATE_STOPPED 3
218 #define STATE_CLOSING 4
219 #define STATE_STOPPING 5
220 #define STATE_REQ_SENT 6
221 #define STATE_ACK_RCVD 7
222 #define STATE_ACK_SENT 8
223 #define STATE_OPENED 9
224
225 struct ppp_header {
226 u_char address;
227 u_char control;
228 u_short protocol;
229 };
230 #define PPP_HEADER_LEN sizeof (struct ppp_header)
231
232 struct lcp_header {
233 u_char type;
234 u_char ident;
235 u_short len;
236 };
237 #define LCP_HEADER_LEN sizeof (struct lcp_header)
238
239 struct cisco_packet {
240 u_long type;
241 u_long par1;
242 u_long par2;
243 u_short rel;
244 u_short time0;
245 u_short time1;
246 };
247 #define CISCO_PACKET_LEN 18
248
249 /*
250 * We follow the spelling and capitalization of RFC 1661 here, to make
251 * it easier comparing with the standard. Please refer to this RFC in
252 * case you can't make sense out of these abbreviation; it will also
253 * explain the semantics related to the various events and actions.
254 */
255 struct cp {
256 u_short proto; /* PPP control protocol number */
257 u_char protoidx; /* index into state table in struct sppp */
258 u_char flags;
259 #define CP_LCP 0x01 /* this is the LCP */
260 #define CP_AUTH 0x02 /* this is an authentication protocol */
261 #define CP_NCP 0x04 /* this is a NCP */
262 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
263 const char *name; /* name of this control protocol */
264 /* event handlers */
265 void (*Up)(struct sppp *sp);
266 void (*Down)(struct sppp *sp);
267 void (*Open)(struct sppp *sp);
268 void (*Close)(struct sppp *sp);
269 void (*TO)(void *sp);
270 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
271 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
272 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
273 /* actions */
274 void (*tlu)(struct sppp *sp);
275 void (*tld)(struct sppp *sp);
276 void (*tls)(struct sppp *sp);
277 void (*tlf)(struct sppp *sp);
278 void (*scr)(struct sppp *sp);
279 };
280
281 static struct sppp *spppq;
282 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
283 static struct callout_handle keepalive_ch;
284 #endif
285
286 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
287 #define SPP_FMT "%s%d: "
288 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit
289 #else
290 #define SPP_FMT "%s: "
291 #define SPP_ARGS(ifp) (ifp)->if_xname
292 #endif
293
294 /*
295 * The following disgusting hack gets around the problem that IP TOS
296 * can't be set yet. We want to put "interactive" traffic on a high
297 * priority queue. To decide if traffic is interactive, we check that
298 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
299 *
300 * XXX is this really still necessary? - joerg -
301 */
302 static u_short interactive_ports[8] = {
303 0, 513, 0, 0,
304 0, 21, 0, 23,
305 };
306 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
307
308 /* almost every function needs these */
309 #define STDDCL \
310 struct ifnet *ifp = &sp->pp_if; \
311 int debug = ifp->if_flags & IFF_DEBUG
312
313 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
314 struct sockaddr *dst, struct rtentry *rt);
315
316 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
317 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
318
319 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
320 struct mbuf *m);
321 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
322 u_char ident, u_short len, void *data);
323 /* static void sppp_cp_timeout(void *arg); */
324 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
325 int newstate);
326 static void sppp_auth_send(const struct cp *cp,
327 struct sppp *sp, unsigned int type, unsigned int id,
328 ...);
329
330 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
331 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
332 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
333 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
334 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
335
336 static void sppp_null(struct sppp *sp);
337
338 static void sppp_lcp_init(struct sppp *sp);
339 static void sppp_lcp_up(struct sppp *sp);
340 static void sppp_lcp_down(struct sppp *sp);
341 static void sppp_lcp_open(struct sppp *sp);
342 static void sppp_lcp_close(struct sppp *sp);
343 static void sppp_lcp_TO(void *sp);
344 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
345 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
346 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
347 static void sppp_lcp_tlu(struct sppp *sp);
348 static void sppp_lcp_tld(struct sppp *sp);
349 static void sppp_lcp_tls(struct sppp *sp);
350 static void sppp_lcp_tlf(struct sppp *sp);
351 static void sppp_lcp_scr(struct sppp *sp);
352 static void sppp_lcp_check_and_close(struct sppp *sp);
353 static int sppp_ncp_check(struct sppp *sp);
354
355 static void sppp_ipcp_init(struct sppp *sp);
356 static void sppp_ipcp_up(struct sppp *sp);
357 static void sppp_ipcp_down(struct sppp *sp);
358 static void sppp_ipcp_open(struct sppp *sp);
359 static void sppp_ipcp_close(struct sppp *sp);
360 static void sppp_ipcp_TO(void *sp);
361 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
362 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
363 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
364 static void sppp_ipcp_tlu(struct sppp *sp);
365 static void sppp_ipcp_tld(struct sppp *sp);
366 static void sppp_ipcp_tls(struct sppp *sp);
367 static void sppp_ipcp_tlf(struct sppp *sp);
368 static void sppp_ipcp_scr(struct sppp *sp);
369
370 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
371 static void sppp_pap_init(struct sppp *sp);
372 static void sppp_pap_open(struct sppp *sp);
373 static void sppp_pap_close(struct sppp *sp);
374 static void sppp_pap_TO(void *sp);
375 static void sppp_pap_my_TO(void *sp);
376 static void sppp_pap_tlu(struct sppp *sp);
377 static void sppp_pap_tld(struct sppp *sp);
378 static void sppp_pap_scr(struct sppp *sp);
379
380 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
381 static void sppp_chap_init(struct sppp *sp);
382 static void sppp_chap_open(struct sppp *sp);
383 static void sppp_chap_close(struct sppp *sp);
384 static void sppp_chap_TO(void *sp);
385 static void sppp_chap_tlu(struct sppp *sp);
386 static void sppp_chap_tld(struct sppp *sp);
387 static void sppp_chap_scr(struct sppp *sp);
388
389 static const char *sppp_auth_type_name(u_short proto, u_char type);
390 static const char *sppp_cp_type_name(u_char type);
391 static const char *sppp_dotted_quad(u_long addr);
392 static const char *sppp_ipcp_opt_name(u_char opt);
393 static const char *sppp_lcp_opt_name(u_char opt);
394 static const char *sppp_phase_name(enum ppp_phase phase);
395 static const char *sppp_proto_name(u_short proto);
396 static const char *sppp_state_name(int state);
397 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
398 static int sppp_strnlen(u_char *p, int max);
399 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
400 u_long *srcmask);
401 static void sppp_keepalive(void *dummy);
402 static void sppp_phase_network(struct sppp *sp);
403 static void sppp_print_bytes(const u_char *p, u_short len);
404 static void sppp_print_string(const char *p, u_short len);
405 static void sppp_qflush(struct ifqueue *ifq);
406 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
407
408 /* our control protocol descriptors */
409 static const struct cp lcp = {
410 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
411 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
412 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
413 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
414 sppp_lcp_scr
415 };
416
417 static const struct cp ipcp = {
418 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
419 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
420 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
421 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
422 sppp_ipcp_scr
423 };
424
425 static const struct cp pap = {
426 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
427 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
428 sppp_pap_TO, 0, 0, 0,
429 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
430 sppp_pap_scr
431 };
432
433 static const struct cp chap = {
434 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
435 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
436 sppp_chap_TO, 0, 0, 0,
437 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
438 sppp_chap_scr
439 };
440
441 static const struct cp *cps[IDX_COUNT] = {
442 &lcp, /* IDX_LCP */
443 &ipcp, /* IDX_IPCP */
444 &pap, /* IDX_PAP */
445 &chap, /* IDX_CHAP */
446 };
447
448
449 \f/*
450 * Exported functions, comprising our interface to the lower layer.
451 */
452
453 /*
454 * Process the received packet.
455 */
456 void
457 sppp_input(struct ifnet *ifp, struct mbuf *m)
458 {
459 struct ppp_header *h;
460 struct ifqueue *inq = 0;
461 int s;
462 struct sppp *sp = (struct sppp *)ifp;
463 int debug = ifp->if_flags & IFF_DEBUG;
464
465 if (ifp->if_flags & IFF_UP)
466 /* Count received bytes, add FCS and one flag */
467 ifp->if_ibytes += m->m_pkthdr.len + 3;
468
469 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
470 /* Too small packet, drop it. */
471 if (debug)
472 log(LOG_DEBUG,
473 SPP_FMT "input packet is too small, %d bytes\n",
474 SPP_ARGS(ifp), m->m_pkthdr.len);
475 drop:
476 ++ifp->if_ierrors;
477 ++ifp->if_iqdrops;
478 m_freem (m);
479 return;
480 }
481
482 /* Get PPP header. */
483 h = mtod (m, struct ppp_header*);
484 m_adj (m, PPP_HEADER_LEN);
485
486 switch (h->address) {
487 case PPP_ALLSTATIONS:
488 if (h->control != PPP_UI)
489 goto invalid;
490 if (sp->pp_flags & PP_CISCO) {
491 if (debug)
492 log(LOG_DEBUG,
493 SPP_FMT "PPP packet in Cisco mode "
494 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
495 SPP_ARGS(ifp),
496 h->address, h->control, ntohs(h->protocol));
497 goto drop;
498 }
499 switch (ntohs (h->protocol)) {
500 default:
501 if (sp->state[IDX_LCP] == STATE_OPENED)
502 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
503 ++sp->pp_seq, m->m_pkthdr.len + 2,
504 &h->protocol);
505 if (debug)
506 log(LOG_DEBUG,
507 SPP_FMT "invalid input protocol "
508 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
509 SPP_ARGS(ifp),
510 h->address, h->control, ntohs(h->protocol));
511 ++ifp->if_noproto;
512 goto drop;
513 case PPP_LCP:
514 sppp_cp_input(&lcp, sp, m);
515 m_freem (m);
516 return;
517 case PPP_PAP:
518 if (sp->pp_phase >= PHASE_AUTHENTICATE)
519 sppp_pap_input(sp, m);
520 m_freem (m);
521 return;
522 case PPP_CHAP:
523 if (sp->pp_phase >= PHASE_AUTHENTICATE)
524 sppp_chap_input(sp, m);
525 m_freem (m);
526 return;
527 #if INET
528 case PPP_IPCP:
529 if (sp->pp_phase == PHASE_NETWORK)
530 sppp_cp_input(&ipcp, sp, m);
531 m_freem (m);
532 return;
533 case PPP_IP:
534 if (sp->state[IDX_IPCP] == STATE_OPENED) {
535 schednetisr (NETISR_IP);
536 inq = &ipintrq;
537 }
538 break;
539 #endif
540 #if IPX
541 case PPP_IPX:
542 /* IPX IPXCP not implemented yet */
543 if (sp->pp_phase == PHASE_NETWORK) {
544 schednetisr (NETISR_IPX);
545 inq = &ipxintrq;
546 }
547 break;
548 #endif
549 #if NS
550 case PPP_XNS:
551 /* XNS IDPCP not implemented yet */
552 if (sp->pp_phase == PHASE_NETWORK) {
553 schednetisr (NETISR_NS);
554 inq = &nsintrq;
555 }
556 break;
557 #endif
558 #if ISO
559 case PPP_ISO:
560 /* OSI NLCP not implemented yet */
561 if (sp->pp_phase == PHASE_NETWORK) {
562 schednetisr (NETISR_ISO);
563 inq = &clnlintrq;
564 }
565 break;
566 #endif
567 }
568 break;
569 case CISCO_MULTICAST:
570 case CISCO_UNICAST:
571 /* Don't check the control field here (RFC 1547). */
572 if (! (sp->pp_flags & PP_CISCO)) {
573 if (debug)
574 log(LOG_DEBUG,
575 SPP_FMT "Cisco packet in PPP mode "
576 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
577 SPP_ARGS(ifp),
578 h->address, h->control, ntohs(h->protocol));
579 goto drop;
580 }
581 switch (ntohs (h->protocol)) {
582 default:
583 ++ifp->if_noproto;
584 goto invalid;
585 case CISCO_KEEPALIVE:
586 sppp_cisco_input ((struct sppp*) ifp, m);
587 m_freem (m);
588 return;
589 #if INET
590 case ETHERTYPE_IP:
591 schednetisr (NETISR_IP);
592 inq = &ipintrq;
593 break;
594 #endif
595 #if IPX
596 case ETHERTYPE_IPX:
597 schednetisr (NETISR_IPX);
598 inq = &ipxintrq;
599 break;
600 #endif
601 #if NS
602 case ETHERTYPE_NS:
603 schednetisr (NETISR_NS);
604 inq = &nsintrq;
605 break;
606 #endif
607 }
608 break;
609 default: /* Invalid PPP packet. */
610 invalid:
611 if (debug)
612 log(LOG_DEBUG,
613 SPP_FMT "invalid input packet "
614 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
615 SPP_ARGS(ifp),
616 h->address, h->control, ntohs(h->protocol));
617 goto drop;
618 }
619
620 if (! (ifp->if_flags & IFF_UP) || ! inq)
621 goto drop;
622
623 /* Check queue. */
624 s = splimp();
625 if (IF_QFULL (inq)) {
626 /* Queue overflow. */
627 IF_DROP(inq);
628 splx(s);
629 if (debug)
630 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
631 SPP_ARGS(ifp));
632 goto drop;
633 }
634 IF_ENQUEUE(inq, m);
635 splx(s);
636 }
637
638 /*
639 * Enqueue transmit packet.
640 */
641 static int
642 sppp_output(struct ifnet *ifp, struct mbuf *m,
643 struct sockaddr *dst, struct rtentry *rt)
644 {
645 struct sppp *sp = (struct sppp*) ifp;
646 struct ppp_header *h;
647 struct ifqueue *ifq;
648 int s, rv = 0;
649 int debug = ifp->if_flags & IFF_DEBUG;
650
651 s = splimp();
652
653 if ((ifp->if_flags & IFF_UP) == 0 ||
654 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
655 m_freem (m);
656 splx (s);
657 return (ENETDOWN);
658 }
659
660 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
661 /*
662 * Interface is not yet running, but auto-dial. Need
663 * to start LCP for it.
664 */
665 ifp->if_flags |= IFF_RUNNING;
666 splx(s);
667 lcp.Open(sp);
668 s = splimp();
669 }
670
671 ifq = &ifp->if_snd;
672 #if INET
673 if (dst->sa_family == AF_INET) {
674 /* XXX Check mbuf length here? */
675 struct ip *ip = mtod (m, struct ip*);
676 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
677
678 /*
679 * When using dynamic local IP address assignment by using
680 * 0.0.0.0 as a local address, the first TCP session will
681 * not connect because the local TCP checksum is computed
682 * using 0.0.0.0 which will later become our real IP address
683 * so the TCP checksum computed at the remote end will
684 * become invalid. So we
685 * - don't let packets with src ip addr 0 thru
686 * - we flag TCP packets with src ip 0 as an error
687 */
688
689 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
690 {
691 m_freem(m);
692 splx(s);
693 if(ip->ip_p == IPPROTO_TCP)
694 return(EADDRNOTAVAIL);
695 else
696 return(0);
697 }
698
699 /*
700 * Put low delay, telnet, rlogin and ftp control packets
701 * in front of the queue.
702 */
703 if (IF_QFULL (&sp->pp_fastq))
704 ;
705 else if (ip->ip_tos & IPTOS_LOWDELAY)
706 ifq = &sp->pp_fastq;
707 else if (m->m_len < sizeof *ip + sizeof *tcp)
708 ;
709 else if (ip->ip_p != IPPROTO_TCP)
710 ;
711 else if (INTERACTIVE (ntohs (tcp->th_sport)))
712 ifq = &sp->pp_fastq;
713 else if (INTERACTIVE (ntohs (tcp->th_dport)))
714 ifq = &sp->pp_fastq;
715 }
716 #endif
717
718 /*
719 * Prepend general data packet PPP header. For now, IP only.
720 */
721 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
722 if (! m) {
723 if (debug)
724 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
725 SPP_ARGS(ifp));
726 ++ifp->if_oerrors;
727 splx (s);
728 return (ENOBUFS);
729 }
730 /*
731 * May want to check size of packet
732 * (albeit due to the implementation it's always enough)
733 */
734 h = mtod (m, struct ppp_header*);
735 if (sp->pp_flags & PP_CISCO) {
736 h->address = CISCO_UNICAST; /* unicast address */
737 h->control = 0;
738 } else {
739 h->address = PPP_ALLSTATIONS; /* broadcast address */
740 h->control = PPP_UI; /* Unnumbered Info */
741 }
742
743 switch (dst->sa_family) {
744 #if INET
745 case AF_INET: /* Internet Protocol */
746 if (sp->pp_flags & PP_CISCO)
747 h->protocol = htons (ETHERTYPE_IP);
748 else {
749 /*
750 * Don't choke with an ENETDOWN early. It's
751 * possible that we just started dialing out,
752 * so don't drop the packet immediately. If
753 * we notice that we run out of buffer space
754 * below, we will however remember that we are
755 * not ready to carry IP packets, and return
756 * ENETDOWN, as opposed to ENOBUFS.
757 */
758 h->protocol = htons(PPP_IP);
759 if (sp->state[IDX_IPCP] != STATE_OPENED)
760 rv = ENETDOWN;
761 }
762 break;
763 #endif
764 #if NS
765 case AF_NS: /* Xerox NS Protocol */
766 h->protocol = htons ((sp->pp_flags & PP_CISCO) ?
767 ETHERTYPE_NS : PPP_XNS);
768 break;
769 #endif
770 #if IPX
771 case AF_IPX: /* Novell IPX Protocol */
772 h->protocol = htons ((sp->pp_flags & PP_CISCO) ?
773 ETHERTYPE_IPX : PPP_IPX);
774 break;
775 #endif
776 #if ISO
777 case AF_ISO: /* ISO OSI Protocol */
778 if (sp->pp_flags & PP_CISCO)
779 goto nosupport;
780 h->protocol = htons (PPP_ISO);
781 break;
782 nosupport:
783 #endif
784 default:
785 m_freem (m);
786 ++ifp->if_oerrors;
787 splx (s);
788 return (EAFNOSUPPORT);
789 }
790
791 /*
792 * Queue message on interface, and start output if interface
793 * not yet active.
794 */
795 if (IF_QFULL (ifq)) {
796 IF_DROP (&ifp->if_snd);
797 m_freem (m);
798 ++ifp->if_oerrors;
799 splx (s);
800 return (rv? rv: ENOBUFS);
801 }
802 IF_ENQUEUE (ifq, m);
803 if (! (ifp->if_flags & IFF_OACTIVE))
804 (*ifp->if_start) (ifp);
805
806 /*
807 * Count output packets and bytes.
808 * The packet length includes header, FCS and 1 flag,
809 * according to RFC 1333.
810 */
811 ifp->if_obytes += m->m_pkthdr.len + 3;
812 splx (s);
813 return (0);
814 }
815
816 void
817 sppp_attach(struct ifnet *ifp)
818 {
819 struct sppp *sp = (struct sppp*) ifp;
820
821 /* Initialize keepalive handler. */
822 if (! spppq)
823 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch);
824
825 /* Insert new entry into the keepalive list. */
826 sp->pp_next = spppq;
827 spppq = sp;
828
829 sp->pp_if.if_mtu = PP_MTU;
830 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
831 sp->pp_if.if_type = IFT_PPP;
832 sp->pp_if.if_output = sppp_output;
833 #if 0
834 sp->pp_flags = PP_KEEPALIVE;
835 #endif
836 sp->pp_fastq.ifq_maxlen = 32;
837 sp->pp_cpq.ifq_maxlen = 20;
838 sp->pp_loopcnt = 0;
839 sp->pp_alivecnt = 0;
840 sp->pp_seq = 0;
841 sp->pp_rseq = 0;
842 sp->pp_phase = PHASE_DEAD;
843 sp->pp_up = lcp.Up;
844 sp->pp_down = lcp.Down;
845
846 sppp_lcp_init(sp);
847 sppp_ipcp_init(sp);
848 sppp_pap_init(sp);
849 sppp_chap_init(sp);
850 }
851
852 void
853 sppp_detach(struct ifnet *ifp)
854 {
855 struct sppp **q, *p, *sp = (struct sppp*) ifp;
856 int i;
857
858 /* Remove the entry from the keepalive list. */
859 for (q = &spppq; (p = *q); q = &p->pp_next)
860 if (p == sp) {
861 *q = p->pp_next;
862 break;
863 }
864
865 /* Stop keepalive handler. */
866 if (! spppq)
867 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch);
868
869 for (i = 0; i < IDX_COUNT; i++)
870 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]);
871 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
872 }
873
874 /*
875 * Flush the interface output queue.
876 */
877 void
878 sppp_flush(struct ifnet *ifp)
879 {
880 struct sppp *sp = (struct sppp*) ifp;
881
882 sppp_qflush (&sp->pp_if.if_snd);
883 sppp_qflush (&sp->pp_fastq);
884 sppp_qflush (&sp->pp_cpq);
885 }
886
887 /*
888 * Check if the output queue is empty.
889 */
890 int
891 sppp_isempty(struct ifnet *ifp)
892 {
893 struct sppp *sp = (struct sppp*) ifp;
894 int empty, s;
895
896 s = splimp();
897 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
898 !sp->pp_if.if_snd.ifq_head;
899 splx(s);
900 return (empty);
901 }
902
903 /*
904 * Get next packet to send.
905 */
906 struct mbuf *
907 sppp_dequeue(struct ifnet *ifp)
908 {
909 struct sppp *sp = (struct sppp*) ifp;
910 struct mbuf *m;
911 int s;
912
913 s = splimp();
914 /*
915 * Process only the control protocol queue until we have at
916 * least one NCP open.
917 *
918 * Do always serve all three queues in Cisco mode.
919 */
920 IF_DEQUEUE(&sp->pp_cpq, m);
921 if (m == NULL &&
922 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) {
923 IF_DEQUEUE(&sp->pp_fastq, m);
924 if (m == NULL)
925 IF_DEQUEUE (&sp->pp_if.if_snd, m);
926 }
927 splx(s);
928 return m;
929 }
930
931 /*
932 * Pick the next packet, do not remove it from the queue.
933 */
934 struct mbuf *
935 sppp_pick(struct ifnet *ifp)
936 {
937 struct sppp *sp = (struct sppp*)ifp;
938 struct mbuf *m;
939 int s;
940
941 s= splimp ();
942
943 m = sp->pp_cpq.ifq_head;
944 if (m == NULL &&
945 (sp->pp_phase == PHASE_NETWORK ||
946 (sp->pp_flags & PP_CISCO) != 0))
947 if ((m = sp->pp_fastq.ifq_head) == NULL)
948 m = sp->pp_if.if_snd.ifq_head;
949 splx (s);
950 return (m);
951 }
952
953 /*
954 * Process an ioctl request. Called on low priority level.
955 */
956 int
957 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
958 {
959 struct ifreq *ifr = (struct ifreq*) data;
960 struct sppp *sp = (struct sppp*) ifp;
961 int s, rv, going_up, going_down, newmode;
962
963 s = splimp();
964 rv = 0;
965 switch (cmd) {
966 case SIOCAIFADDR:
967 case SIOCSIFDSTADDR:
968 break;
969
970 case SIOCSIFADDR:
971 if_up(ifp);
972 /* fall through... */
973
974 case SIOCSIFFLAGS:
975 going_up = ifp->if_flags & IFF_UP &&
976 (ifp->if_flags & IFF_RUNNING) == 0;
977 going_down = (ifp->if_flags & IFF_UP) == 0 &&
978 ifp->if_flags & IFF_RUNNING;
979 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE);
980 if (newmode == (IFF_AUTO | IFF_PASSIVE)) {
981 /* sanity */
982 newmode = IFF_PASSIVE;
983 ifp->if_flags &= ~IFF_AUTO;
984 }
985
986 if (going_up || going_down)
987 lcp.Close(sp);
988 if (going_up && newmode == 0) {
989 /* neither auto-dial nor passive */
990 ifp->if_flags |= IFF_RUNNING;
991 if (!(sp->pp_flags & PP_CISCO))
992 lcp.Open(sp);
993 } else if (going_down) {
994 sppp_flush(ifp);
995 ifp->if_flags &= ~IFF_RUNNING;
996 }
997
998 break;
999
1000 #ifdef SIOCSIFMTU
1001 #ifndef ifr_mtu
1002 #define ifr_mtu ifr_metric
1003 #endif
1004 case SIOCSIFMTU:
1005 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1006 return (EINVAL);
1007 ifp->if_mtu = ifr->ifr_mtu;
1008 break;
1009 #endif
1010 #ifdef SLIOCSETMTU
1011 case SLIOCSETMTU:
1012 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1013 return (EINVAL);
1014 ifp->if_mtu = *(short*)data;
1015 break;
1016 #endif
1017 #ifdef SIOCGIFMTU
1018 case SIOCGIFMTU:
1019 ifr->ifr_mtu = ifp->if_mtu;
1020 break;
1021 #endif
1022 #ifdef SLIOCGETMTU
1023 case SLIOCGETMTU:
1024 *(short*)data = ifp->if_mtu;
1025 break;
1026 #endif
1027 case SIOCADDMULTI:
1028 case SIOCDELMULTI:
1029 break;
1030
1031 case SIOCGIFGENERIC:
1032 case SIOCSIFGENERIC:
1033 rv = sppp_params(sp, cmd, data);
1034 break;
1035
1036 default:
1037 rv = ENOTTY;
1038 }
1039 splx(s);
1040 return rv;
1041 }
1042
1043
1044 \f/*
1045 * Cisco framing implementation.
1046 */
1047
1048 /*
1049 * Handle incoming Cisco keepalive protocol packets.
1050 */
1051 static void
1052 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1053 {
1054 STDDCL;
1055 struct cisco_packet *h;
1056 u_long me, mymask;
1057
1058 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1059 if (debug)
1060 log(LOG_DEBUG,
1061 SPP_FMT "cisco invalid packet length: %d bytes\n",
1062 SPP_ARGS(ifp), m->m_pkthdr.len);
1063 return;
1064 }
1065 h = mtod (m, struct cisco_packet*);
1066 if (debug)
1067 log(LOG_DEBUG,
1068 SPP_FMT "cisco input: %d bytes "
1069 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1070 SPP_ARGS(ifp), m->m_pkthdr.len,
1071 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1072 (u_int)h->time0, (u_int)h->time1);
1073 switch (ntohl (h->type)) {
1074 default:
1075 if (debug)
1076 addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
1077 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1078 break;
1079 case CISCO_ADDR_REPLY:
1080 /* Reply on address request, ignore */
1081 break;
1082 case CISCO_KEEPALIVE_REQ:
1083 sp->pp_alivecnt = 0;
1084 sp->pp_rseq = ntohl (h->par1);
1085 if (sp->pp_seq == sp->pp_rseq) {
1086 /* Local and remote sequence numbers are equal.
1087 * Probably, the line is in loopback mode. */
1088 if (sp->pp_loopcnt >= MAXALIVECNT) {
1089 printf (SPP_FMT "loopback\n",
1090 SPP_ARGS(ifp));
1091 sp->pp_loopcnt = 0;
1092 if (ifp->if_flags & IFF_UP) {
1093 if_down (ifp);
1094 sppp_qflush (&sp->pp_cpq);
1095 }
1096 }
1097 ++sp->pp_loopcnt;
1098
1099 /* Generate new local sequence number */
1100 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1101 sp->pp_seq = random();
1102 #else
1103 sp->pp_seq ^= time.tv_sec ^ time.tv_usec;
1104 #endif
1105 break;
1106 }
1107 sp->pp_loopcnt = 0;
1108 if (! (ifp->if_flags & IFF_UP) &&
1109 (ifp->if_flags & IFF_RUNNING)) {
1110 if_up(ifp);
1111 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1112 }
1113 break;
1114 case CISCO_ADDR_REQ:
1115 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1116 if (me != 0L)
1117 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1118 break;
1119 }
1120 }
1121
1122 /*
1123 * Send Cisco keepalive packet.
1124 */
1125 static void
1126 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1127 {
1128 STDDCL;
1129 struct ppp_header *h;
1130 struct cisco_packet *ch;
1131 struct mbuf *m;
1132 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1133 struct timeval tv;
1134 #else
1135 u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1136 #endif
1137
1138 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1139 getmicrouptime(&tv);
1140 #endif
1141
1142 MGETHDR (m, M_DONTWAIT, MT_DATA);
1143 if (! m)
1144 return;
1145 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1146 m->m_pkthdr.rcvif = 0;
1147
1148 h = mtod (m, struct ppp_header*);
1149 h->address = CISCO_MULTICAST;
1150 h->control = 0;
1151 h->protocol = htons (CISCO_KEEPALIVE);
1152
1153 ch = (struct cisco_packet*) (h + 1);
1154 ch->type = htonl (type);
1155 ch->par1 = htonl (par1);
1156 ch->par2 = htonl (par2);
1157 ch->rel = -1;
1158
1159 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1160 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1161 ch->time1 = htons ((u_short) tv.tv_sec);
1162 #else
1163 ch->time0 = htons ((u_short) (t >> 16));
1164 ch->time1 = htons ((u_short) t);
1165 #endif
1166
1167 if (debug)
1168 log(LOG_DEBUG,
1169 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1170 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1171 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1172
1173 if (IF_QFULL (&sp->pp_cpq)) {
1174 IF_DROP (&sp->pp_fastq);
1175 IF_DROP (&ifp->if_snd);
1176 m_freem (m);
1177 } else
1178 IF_ENQUEUE (&sp->pp_cpq, m);
1179 if (! (ifp->if_flags & IFF_OACTIVE))
1180 (*ifp->if_start) (ifp);
1181 ifp->if_obytes += m->m_pkthdr.len + 3;
1182 }
1183
1184 \f/*
1185 * PPP protocol implementation.
1186 */
1187
1188 /*
1189 * Send PPP control protocol packet.
1190 */
1191 static void
1192 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1193 u_char ident, u_short len, void *data)
1194 {
1195 STDDCL;
1196 struct ppp_header *h;
1197 struct lcp_header *lh;
1198 struct mbuf *m;
1199
1200 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1201 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1202 MGETHDR (m, M_DONTWAIT, MT_DATA);
1203 if (! m)
1204 return;
1205 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1206 m->m_pkthdr.rcvif = 0;
1207
1208 h = mtod (m, struct ppp_header*);
1209 h->address = PPP_ALLSTATIONS; /* broadcast address */
1210 h->control = PPP_UI; /* Unnumbered Info */
1211 h->protocol = htons (proto); /* Link Control Protocol */
1212
1213 lh = (struct lcp_header*) (h + 1);
1214 lh->type = type;
1215 lh->ident = ident;
1216 lh->len = htons (LCP_HEADER_LEN + len);
1217 if (len)
1218 bcopy (data, lh+1, len);
1219
1220 if (debug) {
1221 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1222 SPP_ARGS(ifp),
1223 sppp_proto_name(proto),
1224 sppp_cp_type_name (lh->type), lh->ident,
1225 ntohs (lh->len));
1226 if (len)
1227 sppp_print_bytes ((u_char*) (lh+1), len);
1228 addlog(">\n");
1229 }
1230 if (IF_QFULL (&sp->pp_cpq)) {
1231 IF_DROP (&sp->pp_fastq);
1232 IF_DROP (&ifp->if_snd);
1233 m_freem (m);
1234 ++ifp->if_oerrors;
1235 } else
1236 IF_ENQUEUE (&sp->pp_cpq, m);
1237 if (! (ifp->if_flags & IFF_OACTIVE))
1238 (*ifp->if_start) (ifp);
1239 ifp->if_obytes += m->m_pkthdr.len + 3;
1240 }
1241
1242 /*
1243 * Handle incoming PPP control protocol packets.
1244 */
1245 static void
1246 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1247 {
1248 STDDCL;
1249 struct lcp_header *h;
1250 int len = m->m_pkthdr.len;
1251 int rv;
1252 u_char *p;
1253
1254 if (len < 4) {
1255 if (debug)
1256 log(LOG_DEBUG,
1257 SPP_FMT "%s invalid packet length: %d bytes\n",
1258 SPP_ARGS(ifp), cp->name, len);
1259 return;
1260 }
1261 h = mtod (m, struct lcp_header*);
1262 if (debug) {
1263 log(LOG_DEBUG,
1264 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1265 SPP_ARGS(ifp), cp->name,
1266 sppp_state_name(sp->state[cp->protoidx]),
1267 sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1268 if (len > 4)
1269 sppp_print_bytes ((u_char*) (h+1), len-4);
1270 addlog(">\n");
1271 }
1272 if (len > ntohs (h->len))
1273 len = ntohs (h->len);
1274 p = (u_char *)(h + 1);
1275 switch (h->type) {
1276 case CONF_REQ:
1277 if (len < 4) {
1278 if (debug)
1279 addlog(SPP_FMT "%s invalid conf-req length %d\n",
1280 SPP_ARGS(ifp), cp->name,
1281 len);
1282 ++ifp->if_ierrors;
1283 break;
1284 }
1285 /* handle states where RCR doesn't get a SCA/SCN */
1286 switch (sp->state[cp->protoidx]) {
1287 case STATE_CLOSING:
1288 case STATE_STOPPING:
1289 return;
1290 case STATE_CLOSED:
1291 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1292 0, 0);
1293 return;
1294 }
1295 rv = (cp->RCR)(sp, h, len);
1296 switch (sp->state[cp->protoidx]) {
1297 case STATE_OPENED:
1298 (cp->tld)(sp);
1299 (cp->scr)(sp);
1300 /* fall through... */
1301 case STATE_ACK_SENT:
1302 case STATE_REQ_SENT:
1303 sppp_cp_change_state(cp, sp, rv?
1304 STATE_ACK_SENT: STATE_REQ_SENT);
1305 break;
1306 case STATE_STOPPED:
1307 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1308 (cp->scr)(sp);
1309 sppp_cp_change_state(cp, sp, rv?
1310 STATE_ACK_SENT: STATE_REQ_SENT);
1311 break;
1312 case STATE_ACK_RCVD:
1313 if (rv) {
1314 sppp_cp_change_state(cp, sp, STATE_OPENED);
1315 if (debug)
1316 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1317 SPP_ARGS(ifp),
1318 cp->name);
1319 (cp->tlu)(sp);
1320 } else
1321 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1322 break;
1323 default:
1324 printf(SPP_FMT "%s illegal %s in state %s\n",
1325 SPP_ARGS(ifp), cp->name,
1326 sppp_cp_type_name(h->type),
1327 sppp_state_name(sp->state[cp->protoidx]));
1328 ++ifp->if_ierrors;
1329 }
1330 break;
1331 case CONF_ACK:
1332 if (h->ident != sp->confid[cp->protoidx]) {
1333 if (debug)
1334 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1335 SPP_ARGS(ifp), cp->name,
1336 h->ident, sp->confid[cp->protoidx]);
1337 ++ifp->if_ierrors;
1338 break;
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_CLOSING:
1346 case STATE_STOPPING:
1347 break;
1348 case STATE_REQ_SENT:
1349 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1350 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1351 break;
1352 case STATE_OPENED:
1353 (cp->tld)(sp);
1354 /* fall through */
1355 case STATE_ACK_RCVD:
1356 (cp->scr)(sp);
1357 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1358 break;
1359 case STATE_ACK_SENT:
1360 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1361 sppp_cp_change_state(cp, sp, STATE_OPENED);
1362 if (debug)
1363 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1364 SPP_ARGS(ifp), cp->name);
1365 (cp->tlu)(sp);
1366 break;
1367 default:
1368 printf(SPP_FMT "%s illegal %s in state %s\n",
1369 SPP_ARGS(ifp), cp->name,
1370 sppp_cp_type_name(h->type),
1371 sppp_state_name(sp->state[cp->protoidx]));
1372 ++ifp->if_ierrors;
1373 }
1374 break;
1375 case CONF_NAK:
1376 case CONF_REJ:
1377 if (h->ident != sp->confid[cp->protoidx]) {
1378 if (debug)
1379 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1380 SPP_ARGS(ifp), cp->name,
1381 h->ident, sp->confid[cp->protoidx]);
1382 ++ifp->if_ierrors;
1383 break;
1384 }
1385 if (h->type == CONF_NAK)
1386 (cp->RCN_nak)(sp, h, len);
1387 else /* CONF_REJ */
1388 (cp->RCN_rej)(sp, h, len);
1389
1390 switch (sp->state[cp->protoidx]) {
1391 case STATE_CLOSED:
1392 case STATE_STOPPED:
1393 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1394 break;
1395 case STATE_REQ_SENT:
1396 case STATE_ACK_SENT:
1397 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1398 (cp->scr)(sp);
1399 break;
1400 case STATE_OPENED:
1401 (cp->tld)(sp);
1402 /* fall through */
1403 case STATE_ACK_RCVD:
1404 sppp_cp_change_state(cp, sp, STATE_ACK_SENT);
1405 (cp->scr)(sp);
1406 break;
1407 case STATE_CLOSING:
1408 case STATE_STOPPING:
1409 break;
1410 default:
1411 printf(SPP_FMT "%s illegal %s in state %s\n",
1412 SPP_ARGS(ifp), cp->name,
1413 sppp_cp_type_name(h->type),
1414 sppp_state_name(sp->state[cp->protoidx]));
1415 ++ifp->if_ierrors;
1416 }
1417 break;
1418
1419 case TERM_REQ:
1420 switch (sp->state[cp->protoidx]) {
1421 case STATE_ACK_RCVD:
1422 case STATE_ACK_SENT:
1423 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1424 /* fall through */
1425 case STATE_CLOSED:
1426 case STATE_STOPPED:
1427 case STATE_CLOSING:
1428 case STATE_STOPPING:
1429 case STATE_REQ_SENT:
1430 sta:
1431 /* Send Terminate-Ack packet. */
1432 if (debug)
1433 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1434 SPP_ARGS(ifp), cp->name);
1435 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1436 break;
1437 case STATE_OPENED:
1438 (cp->tld)(sp);
1439 sp->rst_counter[cp->protoidx] = 0;
1440 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1441 goto sta;
1442 break;
1443 default:
1444 printf(SPP_FMT "%s illegal %s in state %s\n",
1445 SPP_ARGS(ifp), cp->name,
1446 sppp_cp_type_name(h->type),
1447 sppp_state_name(sp->state[cp->protoidx]));
1448 ++ifp->if_ierrors;
1449 }
1450 break;
1451 case TERM_ACK:
1452 switch (sp->state[cp->protoidx]) {
1453 case STATE_CLOSED:
1454 case STATE_STOPPED:
1455 case STATE_REQ_SENT:
1456 case STATE_ACK_SENT:
1457 break;
1458 case STATE_CLOSING:
1459 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1460 (cp->tlf)(sp);
1461 break;
1462 case STATE_STOPPING:
1463 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1464 (cp->tlf)(sp);
1465 break;
1466 case STATE_ACK_RCVD:
1467 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1468 break;
1469 case STATE_OPENED:
1470 (cp->tld)(sp);
1471 (cp->scr)(sp);
1472 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1473 break;
1474 default:
1475 printf(SPP_FMT "%s illegal %s in state %s\n",
1476 SPP_ARGS(ifp), cp->name,
1477 sppp_cp_type_name(h->type),
1478 sppp_state_name(sp->state[cp->protoidx]));
1479 ++ifp->if_ierrors;
1480 }
1481 break;
1482 case CODE_REJ:
1483 case PROTO_REJ:
1484 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1485 log(LOG_INFO,
1486 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1487 "danger will robinson\n",
1488 SPP_ARGS(ifp), cp->name,
1489 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1490 switch (sp->state[cp->protoidx]) {
1491 case STATE_CLOSED:
1492 case STATE_STOPPED:
1493 case STATE_REQ_SENT:
1494 case STATE_ACK_SENT:
1495 case STATE_CLOSING:
1496 case STATE_STOPPING:
1497 case STATE_OPENED:
1498 break;
1499 case STATE_ACK_RCVD:
1500 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1501 break;
1502 default:
1503 printf(SPP_FMT "%s illegal %s in state %s\n",
1504 SPP_ARGS(ifp), cp->name,
1505 sppp_cp_type_name(h->type),
1506 sppp_state_name(sp->state[cp->protoidx]));
1507 ++ifp->if_ierrors;
1508 }
1509 break;
1510 case DISC_REQ:
1511 if (cp->proto != PPP_LCP)
1512 goto illegal;
1513 /* Discard the packet. */
1514 break;
1515 case ECHO_REQ:
1516 if (cp->proto != PPP_LCP)
1517 goto illegal;
1518 if (sp->state[cp->protoidx] != STATE_OPENED) {
1519 if (debug)
1520 addlog(SPP_FMT "lcp echo req but lcp closed\n",
1521 SPP_ARGS(ifp));
1522 ++ifp->if_ierrors;
1523 break;
1524 }
1525 if (len < 8) {
1526 if (debug)
1527 addlog(SPP_FMT "invalid lcp echo request "
1528 "packet length: %d bytes\n",
1529 SPP_ARGS(ifp), len);
1530 break;
1531 }
1532 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1533 /* Line loopback mode detected. */
1534 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1535 if_down (ifp);
1536 sppp_qflush (&sp->pp_cpq);
1537
1538 /* Shut down the PPP link. */
1539 /* XXX */
1540 lcp.Down(sp);
1541 lcp.Up(sp);
1542 break;
1543 }
1544 *(long*)(h+1) = htonl (sp->lcp.magic);
1545 if (debug)
1546 addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
1547 SPP_ARGS(ifp));
1548 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1549 break;
1550 case ECHO_REPLY:
1551 if (cp->proto != PPP_LCP)
1552 goto illegal;
1553 if (h->ident != sp->lcp.echoid) {
1554 ++ifp->if_ierrors;
1555 break;
1556 }
1557 if (len < 8) {
1558 if (debug)
1559 addlog(SPP_FMT "lcp invalid echo reply "
1560 "packet length: %d bytes\n",
1561 SPP_ARGS(ifp), len);
1562 break;
1563 }
1564 if (debug)
1565 addlog(SPP_FMT "lcp got echo rep\n",
1566 SPP_ARGS(ifp));
1567 if (ntohl (*(long*)(h+1)) != sp->lcp.magic)
1568 sp->pp_alivecnt = 0;
1569 break;
1570 default:
1571 /* Unknown packet type -- send Code-Reject packet. */
1572 illegal:
1573 if (debug)
1574 addlog(SPP_FMT "%s send code-rej for 0x%x\n",
1575 SPP_ARGS(ifp), cp->name, h->type);
1576 sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq,
1577 m->m_pkthdr.len, h);
1578 ++ifp->if_ierrors;
1579 }
1580 }
1581
1582
1583 /*
1584 * The generic part of all Up/Down/Open/Close/TO event handlers.
1585 * Basically, the state transition handling in the automaton.
1586 */
1587 static void
1588 sppp_up_event(const struct cp *cp, struct sppp *sp)
1589 {
1590 STDDCL;
1591
1592 if (debug)
1593 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1594 SPP_ARGS(ifp), cp->name,
1595 sppp_state_name(sp->state[cp->protoidx]));
1596
1597 switch (sp->state[cp->protoidx]) {
1598 case STATE_INITIAL:
1599 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1600 break;
1601 case STATE_STARTING:
1602 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1603 (cp->scr)(sp);
1604 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1605 break;
1606 default:
1607 printf(SPP_FMT "%s illegal up in state %s\n",
1608 SPP_ARGS(ifp), cp->name,
1609 sppp_state_name(sp->state[cp->protoidx]));
1610 }
1611 }
1612
1613 static void
1614 sppp_down_event(const struct cp *cp, struct sppp *sp)
1615 {
1616 STDDCL;
1617
1618 if (debug)
1619 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1620 SPP_ARGS(ifp), cp->name,
1621 sppp_state_name(sp->state[cp->protoidx]));
1622
1623 switch (sp->state[cp->protoidx]) {
1624 case STATE_CLOSED:
1625 case STATE_CLOSING:
1626 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1627 break;
1628 case STATE_STOPPED:
1629 sppp_cp_change_state(cp, sp, STATE_STARTING);
1630 (cp->tls)(sp);
1631 break;
1632 case STATE_STOPPING:
1633 case STATE_REQ_SENT:
1634 case STATE_ACK_RCVD:
1635 case STATE_ACK_SENT:
1636 sppp_cp_change_state(cp, sp, STATE_STARTING);
1637 break;
1638 case STATE_OPENED:
1639 (cp->tld)(sp);
1640 sppp_cp_change_state(cp, sp, STATE_STARTING);
1641 break;
1642 default:
1643 printf(SPP_FMT "%s illegal down in state %s\n",
1644 SPP_ARGS(ifp), cp->name,
1645 sppp_state_name(sp->state[cp->protoidx]));
1646 }
1647 }
1648
1649
1650 static void
1651 sppp_open_event(const struct cp *cp, struct sppp *sp)
1652 {
1653 STDDCL;
1654
1655 if (debug)
1656 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1657 SPP_ARGS(ifp), cp->name,
1658 sppp_state_name(sp->state[cp->protoidx]));
1659
1660 switch (sp->state[cp->protoidx]) {
1661 case STATE_INITIAL:
1662 sppp_cp_change_state(cp, sp, STATE_STARTING);
1663 (cp->tls)(sp);
1664 break;
1665 case STATE_STARTING:
1666 break;
1667 case STATE_CLOSED:
1668 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1669 (cp->scr)(sp);
1670 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1671 break;
1672 case STATE_STOPPED:
1673 case STATE_STOPPING:
1674 case STATE_REQ_SENT:
1675 case STATE_ACK_RCVD:
1676 case STATE_ACK_SENT:
1677 case STATE_OPENED:
1678 break;
1679 case STATE_CLOSING:
1680 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1681 break;
1682 }
1683 }
1684
1685
1686 static void
1687 sppp_close_event(const struct cp *cp, struct sppp *sp)
1688 {
1689 STDDCL;
1690
1691 if (debug)
1692 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1693 SPP_ARGS(ifp), cp->name,
1694 sppp_state_name(sp->state[cp->protoidx]));
1695
1696 switch (sp->state[cp->protoidx]) {
1697 case STATE_INITIAL:
1698 case STATE_CLOSED:
1699 case STATE_CLOSING:
1700 break;
1701 case STATE_STARTING:
1702 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1703 (cp->tlf)(sp);
1704 break;
1705 case STATE_STOPPED:
1706 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1707 break;
1708 case STATE_STOPPING:
1709 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1710 break;
1711 case STATE_OPENED:
1712 (cp->tld)(sp);
1713 /* fall through */
1714 case STATE_REQ_SENT:
1715 case STATE_ACK_RCVD:
1716 case STATE_ACK_SENT:
1717 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
1718 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0);
1719 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1720 break;
1721 }
1722 }
1723
1724 static void
1725 sppp_to_event(const struct cp *cp, struct sppp *sp)
1726 {
1727 STDDCL;
1728 int s;
1729
1730 s = splimp();
1731 if (debug)
1732 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
1733 SPP_ARGS(ifp), cp->name,
1734 sppp_state_name(sp->state[cp->protoidx]),
1735 sp->rst_counter[cp->protoidx]);
1736
1737 if (--sp->rst_counter[cp->protoidx] < 0)
1738 /* TO- event */
1739 switch (sp->state[cp->protoidx]) {
1740 case STATE_CLOSING:
1741 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1742 (cp->tlf)(sp);
1743 break;
1744 case STATE_STOPPING:
1745 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1746 (cp->tlf)(sp);
1747 break;
1748 case STATE_REQ_SENT:
1749 case STATE_ACK_RCVD:
1750 case STATE_ACK_SENT:
1751 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1752 (cp->tlf)(sp);
1753 break;
1754 }
1755 else
1756 /* TO+ event */
1757 switch (sp->state[cp->protoidx]) {
1758 case STATE_CLOSING:
1759 case STATE_STOPPING:
1760 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq,
1761 0, 0);
1762 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
1763 sp->ch[cp->protoidx]);
1764 break;
1765 case STATE_REQ_SENT:
1766 case STATE_ACK_RCVD:
1767 (cp->scr)(sp);
1768 /* sppp_cp_change_state() will restart the timer */
1769 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1770 break;
1771 case STATE_ACK_SENT:
1772 (cp->scr)(sp);
1773 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
1774 sp->ch[cp->protoidx]);
1775 break;
1776 }
1777
1778 splx(s);
1779 }
1780
1781 /*
1782 * Change the state of a control protocol in the state automaton.
1783 * Takes care of starting/stopping the restart timer.
1784 */
1785 void
1786 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
1787 {
1788 sp->state[cp->protoidx] = newstate;
1789
1790 UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]);
1791 switch (newstate) {
1792 case STATE_INITIAL:
1793 case STATE_STARTING:
1794 case STATE_CLOSED:
1795 case STATE_STOPPED:
1796 case STATE_OPENED:
1797 break;
1798 case STATE_CLOSING:
1799 case STATE_STOPPING:
1800 case STATE_REQ_SENT:
1801 case STATE_ACK_RCVD:
1802 case STATE_ACK_SENT:
1803 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
1804 sp->ch[cp->protoidx]);
1805 break;
1806 }
1807 }
1808 \f/*
1809 *--------------------------------------------------------------------------*
1810 * *
1811 * The LCP implementation. *
1812 * *
1813 *--------------------------------------------------------------------------*
1814 */
1815 static void
1816 sppp_lcp_init(struct sppp *sp)
1817 {
1818 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
1819 sp->lcp.magic = 0;
1820 sp->state[IDX_LCP] = STATE_INITIAL;
1821 sp->fail_counter[IDX_LCP] = 0;
1822 sp->lcp.protos = 0;
1823 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
1824
1825 /*
1826 * Initialize counters and timeout values. Note that we don't
1827 * use the 3 seconds suggested in RFC 1661 since we are likely
1828 * running on a fast link. XXX We should probably implement
1829 * the exponential backoff option. Note that these values are
1830 * relevant for all control protocols, not just LCP only.
1831 */
1832 sp->lcp.timeout = 1 * hz;
1833 sp->lcp.max_terminate = 2;
1834 sp->lcp.max_configure = 10;
1835 sp->lcp.max_failure = 10;
1836 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1837 callout_handle_init(&sp->ch[IDX_LCP]);
1838 #endif
1839 }
1840
1841 static void
1842 sppp_lcp_up(struct sppp *sp)
1843 {
1844 STDDCL;
1845
1846 /*
1847 * If this interface is passive or dial-on-demand, and we are
1848 * still in Initial state, it means we've got an incoming
1849 * call. Activate the interface.
1850 */
1851 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
1852 if (debug)
1853 log(LOG_DEBUG,
1854 SPP_FMT "Up event", SPP_ARGS(ifp));
1855 ifp->if_flags |= IFF_RUNNING;
1856 if (sp->state[IDX_LCP] == STATE_INITIAL) {
1857 if (debug)
1858 addlog("(incoming call)\n");
1859 sp->pp_flags |= PP_CALLIN;
1860 lcp.Open(sp);
1861 } else if (debug)
1862 addlog("\n");
1863 }
1864
1865 sppp_up_event(&lcp, sp);
1866 }
1867
1868 static void
1869 sppp_lcp_down(struct sppp *sp)
1870 {
1871 STDDCL;
1872
1873 sppp_down_event(&lcp, sp);
1874
1875 /*
1876 * If this is neither a dial-on-demand nor a passive
1877 * interface, simulate an ``ifconfig down'' action, so the
1878 * administrator can force a redial by another ``ifconfig
1879 * up''. XXX For leased line operation, should we immediately
1880 * try to reopen the connection here?
1881 */
1882 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
1883 log(LOG_INFO,
1884 SPP_FMT "Down event, taking interface down.\n",
1885 SPP_ARGS(ifp));
1886 if_down(ifp);
1887 } else {
1888 if (debug)
1889 log(LOG_DEBUG,
1890 SPP_FMT "Down event (carrier loss)\n",
1891 SPP_ARGS(ifp));
1892 }
1893 sp->pp_flags &= ~PP_CALLIN;
1894 if (sp->state[IDX_LCP] != STATE_INITIAL)
1895 lcp.Close(sp);
1896 ifp->if_flags &= ~IFF_RUNNING;
1897 }
1898
1899 static void
1900 sppp_lcp_open(struct sppp *sp)
1901 {
1902 /*
1903 * If we are authenticator, negotiate LCP_AUTH
1904 */
1905 if (sp->hisauth.proto != 0)
1906 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
1907 else
1908 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
1909 sp->pp_flags &= ~PP_NEEDAUTH;
1910 sppp_open_event(&lcp, sp);
1911 }
1912
1913 static void
1914 sppp_lcp_close(struct sppp *sp)
1915 {
1916 sppp_close_event(&lcp, sp);
1917 }
1918
1919 static void
1920 sppp_lcp_TO(void *cookie)
1921 {
1922 sppp_to_event(&lcp, (struct sppp *)cookie);
1923 }
1924
1925 /*
1926 * Analyze a configure request. Return true if it was agreeable, and
1927 * caused action sca, false if it has been rejected or nak'ed, and
1928 * caused action scn. (The return value is used to make the state
1929 * transition decision in the state automaton.)
1930 */
1931 static int
1932 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
1933 {
1934 STDDCL;
1935 u_char *buf, *r, *p;
1936 int origlen, rlen;
1937 u_long nmagic;
1938 u_short authproto;
1939
1940 len -= 4;
1941 origlen = len;
1942 buf = r = _MALLOC(len, M_TEMP, M_WAITOK);
1943 if (! buf)
1944 return (0);
1945
1946 if (debug)
1947 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
1948 SPP_ARGS(ifp));
1949
1950 /* pass 1: check for things that need to be rejected */
1951 p = (void*) (h+1);
1952 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
1953 if (debug)
1954 addlog(" %s ", sppp_lcp_opt_name(*p));
1955 switch (*p) {
1956 case LCP_OPT_MAGIC:
1957 /* Magic number. */
1958 /* fall through, both are same length */
1959 case LCP_OPT_ASYNC_MAP:
1960 /* Async control character map. */
1961 if (len >= 6 || p[1] == 6)
1962 continue;
1963 if (debug)
1964 addlog("[invalid] ");
1965 break;
1966 case LCP_OPT_MRU:
1967 /* Maximum receive unit. */
1968 if (len >= 4 && p[1] == 4)
1969 continue;
1970 if (debug)
1971 addlog("[invalid] ");
1972 break;
1973 case LCP_OPT_AUTH_PROTO:
1974 if (len < 4) {
1975 if (debug)
1976 addlog("[invalid] ");
1977 break;
1978 }
1979 authproto = (p[2] << 8) + p[3];
1980 if (authproto == PPP_CHAP && p[1] != 5) {
1981 if (debug)
1982 addlog("[invalid chap len] ");
1983 break;
1984 }
1985 if (sp->myauth.proto == 0) {
1986 /* we are not configured to do auth */
1987 if (debug)
1988 addlog("[not configured] ");
1989 break;
1990 }
1991 /*
1992 * Remote want us to authenticate, remember this,
1993 * so we stay in PHASE_AUTHENTICATE after LCP got
1994 * up.
1995 */
1996 sp->pp_flags |= PP_NEEDAUTH;
1997 continue;
1998 default:
1999 /* Others not supported. */
2000 if (debug)
2001 addlog("[rej] ");
2002 break;
2003 }
2004 /* Add the option to rejected list. */
2005 bcopy (p, r, p[1]);
2006 r += p[1];
2007 rlen += p[1];
2008 }
2009 if (rlen) {
2010 if (debug)
2011 addlog(" send conf-rej\n");
2012 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2013 return 0;
2014 } else if (debug)
2015 addlog("\n");
2016
2017 /*
2018 * pass 2: check for option values that are unacceptable and
2019 * thus require to be nak'ed.
2020 */
2021 if (debug)
2022 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2023 SPP_ARGS(ifp));
2024
2025 p = (void*) (h+1);
2026 len = origlen;
2027 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2028 if (debug)
2029 addlog(" %s ", sppp_lcp_opt_name(*p));
2030 switch (*p) {
2031 case LCP_OPT_MAGIC:
2032 /* Magic number -- extract. */
2033 nmagic = (u_long)p[2] << 24 |
2034 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2035 if (nmagic != sp->lcp.magic) {
2036 if (debug)
2037 addlog("0x%lx ", nmagic);
2038 continue;
2039 }
2040 /*
2041 * Local and remote magics equal -- loopback?
2042 */
2043 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2044 printf (SPP_FMT "loopback\n",
2045 SPP_ARGS(ifp));
2046 sp->pp_loopcnt = 0;
2047 if (ifp->if_flags & IFF_UP) {
2048 if_down(ifp);
2049 sppp_qflush(&sp->pp_cpq);
2050 /* XXX ? */
2051 lcp.Down(sp);
2052 lcp.Up(sp);
2053 }
2054 } else if (debug)
2055 addlog("[glitch] ");
2056 ++sp->pp_loopcnt;
2057 /*
2058 * We negate our magic here, and NAK it. If
2059 * we see it later in an NAK packet, we
2060 * suggest a new one.
2061 */
2062 nmagic = ~sp->lcp.magic;
2063 /* Gonna NAK it. */
2064 p[2] = nmagic >> 24;
2065 p[3] = nmagic >> 16;
2066 p[4] = nmagic >> 8;
2067 p[5] = nmagic;
2068 break;
2069
2070 case LCP_OPT_ASYNC_MAP:
2071 /* Async control character map -- check to be zero. */
2072 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) {
2073 if (debug)
2074 addlog("[empty] ");
2075 continue;
2076 }
2077 if (debug)
2078 addlog("[non-empty] ");
2079 /* suggest a zero one */
2080 p[2] = p[3] = p[4] = p[5] = 0;
2081 break;
2082
2083 case LCP_OPT_MRU:
2084 /*
2085 * Maximum receive unit. Always agreeable,
2086 * but ignored by now.
2087 */
2088 sp->lcp.their_mru = p[2] * 256 + p[3];
2089 if (debug)
2090 addlog("%lu ", sp->lcp.their_mru);
2091 continue;
2092
2093 case LCP_OPT_AUTH_PROTO:
2094 authproto = (p[2] << 8) + p[3];
2095 if (sp->myauth.proto != authproto) {
2096 /* not agreed, nak */
2097 if (debug)
2098 addlog("[mine %s != his %s] ",
2099 sppp_proto_name(sp->hisauth.proto),
2100 sppp_proto_name(authproto));
2101 p[2] = sp->myauth.proto >> 8;
2102 p[3] = sp->myauth.proto;
2103 break;
2104 }
2105 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2106 if (debug)
2107 addlog("[chap not MD5] ");
2108 p[4] = CHAP_MD5;
2109 break;
2110 }
2111 continue;
2112 }
2113 /* Add the option to nak'ed list. */
2114 bcopy (p, r, p[1]);
2115 r += p[1];
2116 rlen += p[1];
2117 }
2118 if (rlen) {
2119 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2120 if (debug)
2121 addlog(" max_failure (%d) exceeded, "
2122 "send conf-rej\n",
2123 sp->lcp.max_failure);
2124 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2125 } else {
2126 if (debug)
2127 addlog(" send conf-nak\n");
2128 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2129 }
2130 return 0;
2131 } else {
2132 if (debug)
2133 addlog(" send conf-ack\n");
2134 sp->fail_counter[IDX_LCP] = 0;
2135 sp->pp_loopcnt = 0;
2136 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2137 h->ident, origlen, h+1);
2138 }
2139
2140 FREE(buf, M_TEMP);
2141 return (rlen == 0);
2142 }
2143
2144 /*
2145 * Analyze the LCP Configure-Reject option list, and adjust our
2146 * negotiation.
2147 */
2148 static void
2149 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2150 {
2151 STDDCL;
2152 u_char *buf, *p;
2153
2154 len -= 4;
2155 buf = MALLOC (len, M_TEMP, M_WAITOK);
2156 if (!buf)
2157 return;
2158
2159 if (debug)
2160 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2161 SPP_ARGS(ifp));
2162
2163 p = (void*) (h+1);
2164 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2165 if (debug)
2166 addlog(" %s ", sppp_lcp_opt_name(*p));
2167 switch (*p) {
2168 case LCP_OPT_MAGIC:
2169 /* Magic number -- can't use it, use 0 */
2170 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2171 sp->lcp.magic = 0;
2172 break;
2173 case LCP_OPT_MRU:
2174 /*
2175 * Should not be rejected anyway, since we only
2176 * negotiate a MRU if explicitly requested by
2177 * peer.
2178 */
2179 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2180 break;
2181 case LCP_OPT_AUTH_PROTO:
2182 /*
2183 * Peer doesn't want to authenticate himself,
2184 * deny unless this is a dialout call, and
2185 * AUTHFLAG_NOCALLOUT is set.
2186 */
2187 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2188 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2189 if (debug)
2190 addlog("[don't insist on auth "
2191 "for callout]");
2192 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2193 break;
2194 }
2195 if (debug)
2196 addlog("[access denied]\n");
2197 lcp.Close(sp);
2198 break;
2199 }
2200 }
2201 if (debug)
2202 addlog("\n");
2203 FREE(buf, M_TEMP);
2204 return;
2205 }
2206
2207 /*
2208 * Analyze the LCP Configure-NAK option list, and adjust our
2209 * negotiation.
2210 */
2211 static void
2212 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2213 {
2214 STDDCL;
2215 u_char *buf, *p;
2216 u_long magic;
2217
2218 len -= 4;
2219 buf = MALLOC (len, M_TEMP, M_WAITOK);
2220 if (!buf)
2221 return;
2222
2223 if (debug)
2224 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2225 SPP_ARGS(ifp));
2226
2227 p = (void*) (h+1);
2228 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2229 if (debug)
2230 addlog(" %s ", sppp_lcp_opt_name(*p));
2231 switch (*p) {
2232 case LCP_OPT_MAGIC:
2233 /* Magic number -- renegotiate */
2234 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2235 len >= 6 && p[1] == 6) {
2236 magic = (u_long)p[2] << 24 |
2237 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2238 /*
2239 * If the remote magic is our negated one,
2240 * this looks like a loopback problem.
2241 * Suggest a new magic to make sure.
2242 */
2243 if (magic == ~sp->lcp.magic) {
2244 if (debug)
2245 addlog("magic glitch ");
2246 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2247 sp->lcp.magic = random();
2248 #else
2249 sp->lcp.magic = time.tv_sec + time.tv_usec;
2250 #endif
2251 } else {
2252 sp->lcp.magic = magic;
2253 if (debug)
2254 addlog("%lu ", magic);
2255 }
2256 }
2257 break;
2258 case LCP_OPT_MRU:
2259 /*
2260 * Peer wants to advise us to negotiate an MRU.
2261 * Agree on it if it's reasonable, or use
2262 * default otherwise.
2263 */
2264 if (len >= 4 && p[1] == 4) {
2265 u_int mru = p[2] * 256 + p[3];
2266 if (debug)
2267 addlog("%d ", mru);
2268 if (mru < PP_MTU || mru > PP_MAX_MRU)
2269 mru = PP_MTU;
2270 sp->lcp.mru = mru;
2271 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2272 }
2273 break;
2274 case LCP_OPT_AUTH_PROTO:
2275 /*
2276 * Peer doesn't like our authentication method,
2277 * deny.
2278 */
2279 if (debug)
2280 addlog("[access denied]\n");
2281 lcp.Close(sp);
2282 break;
2283 }
2284 }
2285 if (debug)
2286 addlog("\n");
2287 FREE(buf, M_TEMP);
2288 return;
2289 }
2290
2291 static void
2292 sppp_lcp_tlu(struct sppp *sp)
2293 {
2294 STDDCL;
2295 int i;
2296 u_long mask;
2297
2298 /* XXX ? */
2299 if (! (ifp->if_flags & IFF_UP) &&
2300 (ifp->if_flags & IFF_RUNNING)) {
2301 /* Coming out of loopback mode. */
2302 if_up(ifp);
2303 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2304 }
2305
2306 for (i = 0; i < IDX_COUNT; i++)
2307 if ((cps[i])->flags & CP_QUAL)
2308 (cps[i])->Open(sp);
2309
2310 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2311 (sp->pp_flags & PP_NEEDAUTH) != 0)
2312 sp->pp_phase = PHASE_AUTHENTICATE;
2313 else
2314 sp->pp_phase = PHASE_NETWORK;
2315
2316 if (debug)
2317 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2318 sppp_phase_name(sp->pp_phase));
2319
2320 /*
2321 * Open all authentication protocols. This is even required
2322 * if we already proceeded to network phase, since it might be
2323 * that remote wants us to authenticate, so we might have to
2324 * send a PAP request. Undesired authentication protocols
2325 * don't do anything when they get an Open event.
2326 */
2327 for (i = 0; i < IDX_COUNT; i++)
2328 if ((cps[i])->flags & CP_AUTH)
2329 (cps[i])->Open(sp);
2330
2331 if (sp->pp_phase == PHASE_NETWORK) {
2332 /* Notify all NCPs. */
2333 for (i = 0; i < IDX_COUNT; i++)
2334 if ((cps[i])->flags & CP_NCP)
2335 (cps[i])->Open(sp);
2336 }
2337
2338 /* Send Up events to all started protos. */
2339 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2340 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0)
2341 (cps[i])->Up(sp);
2342
2343 /* notify low-level driver of state change */
2344 if (sp->pp_chg)
2345 sp->pp_chg(sp, (int)sp->pp_phase);
2346
2347 if (sp->pp_phase == PHASE_NETWORK)
2348 /* if no NCP is starting, close down */
2349 sppp_lcp_check_and_close(sp);
2350 }
2351
2352 static void
2353 sppp_lcp_tld(struct sppp *sp)
2354 {
2355 STDDCL;
2356 int i;
2357 u_long mask;
2358
2359 sp->pp_phase = PHASE_TERMINATE;
2360
2361 if (debug)
2362 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2363 sppp_phase_name(sp->pp_phase));
2364
2365 /*
2366 * Take upper layers down. We send the Down event first and
2367 * the Close second to prevent the upper layers from sending
2368 * ``a flurry of terminate-request packets'', as the RFC
2369 * describes it.
2370 */
2371 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2372 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) {
2373 (cps[i])->Down(sp);
2374 (cps[i])->Close(sp);
2375 }
2376 }
2377
2378 static void
2379 sppp_lcp_tls(struct sppp *sp)
2380 {
2381 STDDCL;
2382
2383 sp->pp_phase = PHASE_ESTABLISH;
2384
2385 if (debug)
2386 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2387 sppp_phase_name(sp->pp_phase));
2388
2389 /* Notify lower layer if desired. */
2390 if (sp->pp_tls)
2391 (sp->pp_tls)(sp);
2392 else
2393 (sp->pp_up)(sp);
2394 }
2395
2396 static void
2397 sppp_lcp_tlf(struct sppp *sp)
2398 {
2399 STDDCL;
2400
2401 sp->pp_phase = PHASE_DEAD;
2402 if (debug)
2403 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2404 sppp_phase_name(sp->pp_phase));
2405
2406 /* Notify lower layer if desired. */
2407 if (sp->pp_tlf)
2408 (sp->pp_tlf)(sp);
2409 else
2410 (sp->pp_down)(sp);
2411 }
2412
2413 static void
2414 sppp_lcp_scr(struct sppp *sp)
2415 {
2416 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2417 int i = 0;
2418 u_short authproto;
2419
2420 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2421 if (! sp->lcp.magic)
2422 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2423 sp->lcp.magic = random();
2424 #else
2425 sp->lcp.magic = time.tv_sec + time.tv_usec;
2426 #endif
2427 opt[i++] = LCP_OPT_MAGIC;
2428 opt[i++] = 6;
2429 opt[i++] = sp->lcp.magic >> 24;
2430 opt[i++] = sp->lcp.magic >> 16;
2431 opt[i++] = sp->lcp.magic >> 8;
2432 opt[i++] = sp->lcp.magic;
2433 }
2434
2435 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2436 opt[i++] = LCP_OPT_MRU;
2437 opt[i++] = 4;
2438 opt[i++] = sp->lcp.mru >> 8;
2439 opt[i++] = sp->lcp.mru;
2440 }
2441
2442 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2443 authproto = sp->hisauth.proto;
2444 opt[i++] = LCP_OPT_AUTH_PROTO;
2445 opt[i++] = authproto == PPP_CHAP? 5: 4;
2446 opt[i++] = authproto >> 8;
2447 opt[i++] = authproto;
2448 if (authproto == PPP_CHAP)
2449 opt[i++] = CHAP_MD5;
2450 }
2451
2452 sp->confid[IDX_LCP] = ++sp->pp_seq;
2453 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2454 }
2455
2456 /*
2457 * Check the open NCPs, return true if at least one NCP is open.
2458 */
2459 static int
2460 sppp_ncp_check(struct sppp *sp)
2461 {
2462 int i, mask;
2463
2464 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2465 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP)
2466 return 1;
2467 return 0;
2468 }
2469
2470 /*
2471 * Re-check the open NCPs and see if we should terminate the link.
2472 * Called by the NCPs during their tlf action handling.
2473 */
2474 static void
2475 sppp_lcp_check_and_close(struct sppp *sp)
2476 {
2477
2478 if (sp->pp_phase < PHASE_NETWORK)
2479 /* don't bother, we are already going down */
2480 return;
2481
2482 if (sppp_ncp_check(sp))
2483 return;
2484
2485 lcp.Close(sp);
2486 }
2487 \f/*
2488 *--------------------------------------------------------------------------*
2489 * *
2490 * The IPCP implementation. *
2491 * *
2492 *--------------------------------------------------------------------------*
2493 */
2494
2495 static void
2496 sppp_ipcp_init(struct sppp *sp)
2497 {
2498 sp->ipcp.opts = 0;
2499 sp->ipcp.flags = 0;
2500 sp->state[IDX_IPCP] = STATE_INITIAL;
2501 sp->fail_counter[IDX_IPCP] = 0;
2502 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2503 callout_handle_init(&sp->ch[IDX_IPCP]);
2504 #endif
2505 }
2506
2507 static void
2508 sppp_ipcp_up(struct sppp *sp)
2509 {
2510 sppp_up_event(&ipcp, sp);
2511 }
2512
2513 static void
2514 sppp_ipcp_down(struct sppp *sp)
2515 {
2516 sppp_down_event(&ipcp, sp);
2517 }
2518
2519 static void
2520 sppp_ipcp_open(struct sppp *sp)
2521 {
2522 STDDCL;
2523 u_long myaddr, hisaddr;
2524
2525 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN);
2526
2527 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2528 /*
2529 * If we don't have his address, this probably means our
2530 * interface doesn't want to talk IP at all. (This could
2531 * be the case if somebody wants to speak only IPX, for
2532 * example.) Don't open IPCP in this case.
2533 */
2534 if (hisaddr == 0L) {
2535 /* XXX this message should go away */
2536 if (debug)
2537 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2538 SPP_ARGS(ifp));
2539 return;
2540 }
2541
2542 if (myaddr == 0L) {
2543 /*
2544 * I don't have an assigned address, so i need to
2545 * negotiate my address.
2546 */
2547 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2548 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2549 } else
2550 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2551 sppp_open_event(&ipcp, sp);
2552 }
2553
2554 static void
2555 sppp_ipcp_close(struct sppp *sp)
2556 {
2557 sppp_close_event(&ipcp, sp);
2558 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2559 /*
2560 * My address was dynamic, clear it again.
2561 */
2562 sppp_set_ip_addr(sp, 0L);
2563 }
2564
2565 static void
2566 sppp_ipcp_TO(void *cookie)
2567 {
2568 sppp_to_event(&ipcp, (struct sppp *)cookie);
2569 }
2570
2571 /*
2572 * Analyze a configure request. Return true if it was agreeable, and
2573 * caused action sca, false if it has been rejected or nak'ed, and
2574 * caused action scn. (The return value is used to make the state
2575 * transition decision in the state automaton.)
2576 */
2577 static int
2578 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2579 {
2580 u_char *buf, *r, *p;
2581 struct ifnet *ifp = &sp->pp_if;
2582 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2583 u_long hisaddr, desiredaddr;
2584 int gotmyaddr = 0;
2585
2586 len -= 4;
2587 origlen = len;
2588 /*
2589 * Make sure to allocate a buf that can at least hold a
2590 * conf-nak with an `address' option. We might need it below.
2591 */
2592 buf = r = MALLOC ((len < 6? 6: len), M_TEMP, M_WAITOK);
2593 if (! buf)
2594 return (0);
2595
2596 /* pass 1: see if we can recognize them */
2597 if (debug)
2598 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2599 SPP_ARGS(ifp));
2600 p = (void*) (h+1);
2601 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2602 if (debug)
2603 addlog(" %s ", sppp_ipcp_opt_name(*p));
2604 switch (*p) {
2605 #ifdef notyet
2606 case IPCP_OPT_COMPRESSION:
2607 if (len >= 6 && p[1] >= 6) {
2608 /* correctly formed compress option */
2609 continue;
2610 }
2611 if (debug)
2612 addlog("[invalid] ");
2613 break;
2614 #endif
2615 case IPCP_OPT_ADDRESS:
2616 if (len >= 6 && p[1] == 6) {
2617 /* correctly formed address option */
2618 continue;
2619 }
2620 if (debug)
2621 addlog("[invalid] ");
2622 break;
2623 default:
2624 /* Others not supported. */
2625 if (debug)
2626 addlog("[rej] ");
2627 break;
2628 }
2629 /* Add the option to rejected list. */
2630 bcopy (p, r, p[1]);
2631 r += p[1];
2632 rlen += p[1];
2633 }
2634 if (rlen) {
2635 if (debug)
2636 addlog(" send conf-rej\n");
2637 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2638 return 0;
2639 } else if (debug)
2640 addlog("\n");
2641
2642 /* pass 2: parse option values */
2643 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
2644 if (debug)
2645 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
2646 SPP_ARGS(ifp));
2647 p = (void*) (h+1);
2648 len = origlen;
2649 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2650 if (debug)
2651 addlog(" %s ", sppp_ipcp_opt_name(*p));
2652 switch (*p) {
2653 #ifdef notyet
2654 case IPCP_OPT_COMPRESSION:
2655 continue;
2656 #endif
2657 case IPCP_OPT_ADDRESS:
2658 /* This is the address he wants in his end */
2659 desiredaddr = p[2] << 24 | p[3] << 16 |
2660 p[4] << 8 | p[5];
2661 if (desiredaddr == hisaddr ||
2662 (hisaddr == 1 && desiredaddr != 0)) {
2663 /*
2664 * Peer's address is same as our value,
2665 * or we have set it to 0.0.0.1 to
2666 * indicate that we do not really care,
2667 * this is agreeable. Gonna conf-ack
2668 * it.
2669 */
2670 if (debug)
2671 addlog("%s [ack] ",
2672 sppp_dotted_quad(hisaddr));
2673 /* record that we've seen it already */
2674 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
2675 continue;
2676 }
2677 /*
2678 * The address wasn't agreeable. This is either
2679 * he sent us 0.0.0.0, asking to assign him an
2680 * address, or he send us another address not
2681 * matching our value. Either case, we gonna
2682 * conf-nak it with our value.
2683 * XXX: we should "rej" if hisaddr == 0
2684 */
2685 if (debug) {
2686 if (desiredaddr == 0)
2687 addlog("[addr requested] ");
2688 else
2689 addlog("%s [not agreed] ",
2690 sppp_dotted_quad(desiredaddr));
2691
2692 p[2] = hisaddr >> 24;
2693 p[3] = hisaddr >> 16;
2694 p[4] = hisaddr >> 8;
2695 p[5] = hisaddr;
2696 }
2697 break;
2698 }
2699 /* Add the option to nak'ed list. */
2700 bcopy (p, r, p[1]);
2701 r += p[1];
2702 rlen += p[1];
2703 }
2704
2705 /*
2706 * If we are about to conf-ack the request, but haven't seen
2707 * his address so far, gonna conf-nak it instead, with the
2708 * `address' option present and our idea of his address being
2709 * filled in there, to request negotiation of both addresses.
2710 *
2711 * XXX This can result in an endless req - nak loop if peer
2712 * doesn't want to send us his address. Q: What should we do
2713 * about it? XXX A: implement the max-failure counter.
2714 */
2715 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
2716 buf[0] = IPCP_OPT_ADDRESS;
2717 buf[1] = 6;
2718 buf[2] = hisaddr >> 24;
2719 buf[3] = hisaddr >> 16;
2720 buf[4] = hisaddr >> 8;
2721 buf[5] = hisaddr;
2722 rlen = 6;
2723 if (debug)
2724 addlog("still need hisaddr ");
2725 }
2726
2727 if (rlen) {
2728 if (debug)
2729 addlog(" send conf-nak\n");
2730 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
2731 } else {
2732 if (debug)
2733 addlog(" send conf-ack\n");
2734 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
2735 h->ident, origlen, h+1);
2736 }
2737
2738 FREE(buf, M_TEMP);
2739 return (rlen == 0);
2740 }
2741
2742 /*
2743 * Analyze the IPCP Configure-Reject option list, and adjust our
2744 * negotiation.
2745 */
2746 static void
2747 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2748 {
2749 u_char *buf, *p;
2750 struct ifnet *ifp = &sp->pp_if;
2751 int debug = ifp->if_flags & IFF_DEBUG;
2752
2753 len -= 4;
2754 buf = MALLOC (len, M_TEMP, M_WAITOK);
2755 if (!buf)
2756 return;
2757
2758 if (debug)
2759 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
2760 SPP_ARGS(ifp));
2761
2762 p = (void*) (h+1);
2763 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2764 if (debug)
2765 addlog(" %s ", sppp_ipcp_opt_name(*p));
2766 switch (*p) {
2767 case IPCP_OPT_ADDRESS:
2768 /*
2769 * Peer doesn't grok address option. This is
2770 * bad. XXX Should we better give up here?
2771 * XXX We could try old "addresses" option...
2772 */
2773 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
2774 break;
2775 #ifdef notyet
2776 case IPCP_OPT_COMPRESS:
2777 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS);
2778 break;
2779 #endif
2780 }
2781 }
2782 if (debug)
2783 addlog("\n");
2784 FREE(buf, M_TEMP);
2785 return;
2786 }
2787
2788 /*
2789 * Analyze the IPCP Configure-NAK option list, and adjust our
2790 * negotiation.
2791 */
2792 static void
2793 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2794 {
2795 u_char *buf, *p;
2796 struct ifnet *ifp = &sp->pp_if;
2797 int debug = ifp->if_flags & IFF_DEBUG;
2798 u_long wantaddr;
2799
2800 len -= 4;
2801 buf = MALLOC (len, M_TEMP, M_WAITOK);
2802 if (!buf)
2803 return;
2804
2805 if (debug)
2806 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
2807 SPP_ARGS(ifp));
2808
2809 p = (void*) (h+1);
2810 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2811 if (debug)
2812 addlog(" %s ", sppp_ipcp_opt_name(*p));
2813 switch (*p) {
2814 case IPCP_OPT_ADDRESS:
2815 /*
2816 * Peer doesn't like our local IP address. See
2817 * if we can do something for him. We'll drop
2818 * him our address then.
2819 */
2820 if (len >= 6 && p[1] == 6) {
2821 wantaddr = p[2] << 24 | p[3] << 16 |
2822 p[4] << 8 | p[5];
2823 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2824 if (debug)
2825 addlog("[wantaddr %s] ",
2826 sppp_dotted_quad(wantaddr));
2827 /*
2828 * When doing dynamic address assignment,
2829 * we accept his offer. Otherwise, we
2830 * ignore it and thus continue to negotiate
2831 * our already existing value.
2832 * XXX: Bogus, if he said no once, he'll
2833 * just say no again, might as well die.
2834 */
2835 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
2836 sppp_set_ip_addr(sp, wantaddr);
2837 if (debug)
2838 addlog("[agree] ");
2839 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2840 }
2841 }
2842 break;
2843 #ifdef notyet
2844 case IPCP_OPT_COMPRESS:
2845 /*
2846 * Peer wants different compression parameters.
2847 */
2848 break;
2849 #endif
2850 }
2851 }
2852 if (debug)
2853 addlog("\n");
2854 FREE(buf, M_TEMP);
2855 return;
2856 }
2857
2858 static void
2859 sppp_ipcp_tlu(struct sppp *sp)
2860 {
2861 /* we are up - notify isdn daemon */
2862 if (sp->pp_con)
2863 sp->pp_con(sp);
2864 }
2865
2866 static void
2867 sppp_ipcp_tld(struct sppp *sp)
2868 {
2869 }
2870
2871 static void
2872 sppp_ipcp_tls(struct sppp *sp)
2873 {
2874 /* indicate to LCP that it must stay alive */
2875 sp->lcp.protos |= (1 << IDX_IPCP);
2876 }
2877
2878 static void
2879 sppp_ipcp_tlf(struct sppp *sp)
2880 {
2881 /* we no longer need LCP */
2882 sp->lcp.protos &= ~(1 << IDX_IPCP);
2883 sppp_lcp_check_and_close(sp);
2884 }
2885
2886 static void
2887 sppp_ipcp_scr(struct sppp *sp)
2888 {
2889 char opt[6 /* compression */ + 6 /* address */];
2890 u_long ouraddr;
2891 int i = 0;
2892
2893 #ifdef notyet
2894 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
2895 opt[i++] = IPCP_OPT_COMPRESSION;
2896 opt[i++] = 6;
2897 opt[i++] = 0; /* VJ header compression */
2898 opt[i++] = 0x2d; /* VJ header compression */
2899 opt[i++] = max_slot_id;
2900 opt[i++] = comp_slot_id;
2901 }
2902 #endif
2903
2904 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
2905 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
2906 opt[i++] = IPCP_OPT_ADDRESS;
2907 opt[i++] = 6;
2908 opt[i++] = ouraddr >> 24;
2909 opt[i++] = ouraddr >> 16;
2910 opt[i++] = ouraddr >> 8;
2911 opt[i++] = ouraddr;
2912 }
2913
2914 sp->confid[IDX_IPCP] = ++sp->pp_seq;
2915 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
2916 }
2917
2918
2919 \f/*
2920 *--------------------------------------------------------------------------*
2921 * *
2922 * The CHAP implementation. *
2923 * *
2924 *--------------------------------------------------------------------------*
2925 */
2926
2927 /*
2928 * The authentication protocols don't employ a full-fledged state machine as
2929 * the control protocols do, since they do have Open and Close events, but
2930 * not Up and Down, nor are they explicitly terminated. Also, use of the
2931 * authentication protocols may be different in both directions (this makes
2932 * sense, think of a machine that never accepts incoming calls but only
2933 * calls out, it doesn't require the called party to authenticate itself).
2934 *
2935 * Our state machine for the local authentication protocol (we are requesting
2936 * the peer to authenticate) looks like:
2937 *
2938 * RCA-
2939 * +--------------------------------------------+
2940 * V scn,tld|
2941 * +--------+ Close +---------+ RCA+
2942 * | |<----------------------------------| |------+
2943 * +--->| Closed | TO* | Opened | sca |
2944 * | | |-----+ +-------| |<-----+
2945 * | +--------+ irc | | +---------+
2946 * | ^ | | ^
2947 * | | | | |
2948 * | | | | |
2949 * | TO-| | | |
2950 * | |tld TO+ V | |
2951 * | | +------->+ | |
2952 * | | | | | |
2953 * | +--------+ V | |
2954 * | | |<----+<--------------------+ |
2955 * | | Req- | scr |
2956 * | | Sent | |
2957 * | | | |
2958 * | +--------+ |
2959 * | RCA- | | RCA+ |
2960 * +------+ +------------------------------------------+
2961 * scn,tld sca,irc,ict,tlu
2962 *
2963 *
2964 * with:
2965 *
2966 * Open: LCP reached authentication phase
2967 * Close: LCP reached terminate phase
2968 *
2969 * RCA+: received reply (pap-req, chap-response), acceptable
2970 * RCN: received reply (pap-req, chap-response), not acceptable
2971 * TO+: timeout with restart counter >= 0
2972 * TO-: timeout with restart counter < 0
2973 * TO*: reschedule timeout for CHAP
2974 *
2975 * scr: send request packet (none for PAP, chap-challenge)
2976 * sca: send ack packet (pap-ack, chap-success)
2977 * scn: send nak packet (pap-nak, chap-failure)
2978 * ict: initialize re-challenge timer (CHAP only)
2979 *
2980 * tlu: this-layer-up, LCP reaches network phase
2981 * tld: this-layer-down, LCP enters terminate phase
2982 *
2983 * Note that in CHAP mode, after sending a new challenge, while the state
2984 * automaton falls back into Req-Sent state, it doesn't signal a tld
2985 * event to LCP, so LCP remains in network phase. Only after not getting
2986 * any response (or after getting an unacceptable response), CHAP closes,
2987 * causing LCP to enter terminate phase.
2988 *
2989 * With PAP, there is no initial request that can be sent. The peer is
2990 * expected to send one based on the successful negotiation of PAP as
2991 * the authentication protocol during the LCP option negotiation.
2992 *
2993 * Incoming authentication protocol requests (remote requests
2994 * authentication, we are peer) don't employ a state machine at all,
2995 * they are simply answered. Some peers [Ascend P50 firmware rev
2996 * 4.50] react allergically when sending IPCP requests while they are
2997 * still in authentication phase (thereby violating the standard that
2998 * demands that these NCP packets are to be discarded), so we keep
2999 * track of the peer demanding us to authenticate, and only proceed to
3000 * phase network once we've seen a positive acknowledge for the
3001 * authentication.
3002 */
3003
3004 /*
3005 * Handle incoming CHAP packets.
3006 */
3007 void
3008 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3009 {
3010 STDDCL;
3011 struct lcp_header *h;
3012 int len, x;
3013 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3014 int value_len, name_len;
3015 MD5_CTX ctx;
3016
3017 len = m->m_pkthdr.len;
3018 if (len < 4) {
3019 if (debug)
3020 log(LOG_DEBUG,
3021 SPP_FMT "chap invalid packet length: %d bytes\n",
3022 SPP_ARGS(ifp), len);
3023 return;
3024 }
3025 h = mtod (m, struct lcp_header*);
3026 if (len > ntohs (h->len))
3027 len = ntohs (h->len);
3028
3029 switch (h->type) {
3030 /* challenge, failure and success are his authproto */
3031 case CHAP_CHALLENGE:
3032 value = 1 + (u_char*)(h+1);
3033 value_len = value[-1];
3034 name = value + value_len;
3035 name_len = len - value_len - 5;
3036 if (name_len < 0) {
3037 if (debug) {
3038 log(LOG_DEBUG,
3039 SPP_FMT "chap corrupted challenge "
3040 "<%s id=0x%x len=%d",
3041 SPP_ARGS(ifp),
3042 sppp_auth_type_name(PPP_CHAP, h->type),
3043 h->ident, ntohs(h->len));
3044 if (len > 4)
3045 sppp_print_bytes((u_char*) (h+1), len-4);
3046 addlog(">\n");
3047 }
3048 break;
3049 }
3050
3051 if (debug) {
3052 log(LOG_DEBUG,
3053 SPP_FMT "chap input <%s id=0x%x len=%d name=",
3054 SPP_ARGS(ifp),
3055 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
3056 ntohs(h->len));
3057 sppp_print_string((char*) name, name_len);
3058 addlog(" value-size=%d value=", value_len);
3059 sppp_print_bytes(value, value_len);
3060 addlog(">\n");
3061 }
3062
3063 /* Compute reply value. */
3064 MD5Init(&ctx);
3065 MD5Update(&ctx, &h->ident, 1);
3066 MD5Update(&ctx, sp->myauth.secret,
3067 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
3068 MD5Update(&ctx, value, value_len);
3069 MD5Final(digest, &ctx);
3070 dsize = sizeof digest;
3071
3072 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
3073 sizeof dsize, (const char *)&dsize,
3074 sizeof digest, digest,
3075 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
3076 sp->myauth.name,
3077 0);
3078 break;
3079
3080 case CHAP_SUCCESS:
3081 if (debug) {
3082 log(LOG_DEBUG, SPP_FMT "chap success",
3083 SPP_ARGS(ifp));
3084 if (len > 4) {
3085 addlog(": ");
3086 sppp_print_string((char*)(h + 1), len - 4);
3087 }
3088 addlog("\n");
3089 }
3090 x = splimp();
3091 sp->pp_flags &= ~PP_NEEDAUTH;
3092 if (sp->myauth.proto == PPP_CHAP &&
3093 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
3094 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
3095 /*
3096 * We are authenticator for CHAP but didn't
3097 * complete yet. Leave it to tlu to proceed
3098 * to network phase.
3099 */
3100 splx(x);
3101 break;
3102 }
3103 splx(x);
3104 sppp_phase_network(sp);
3105 break;
3106
3107 case CHAP_FAILURE:
3108 if (debug) {
3109 log(LOG_INFO, SPP_FMT "chap failure",
3110 SPP_ARGS(ifp));
3111 if (len > 4) {
3112 addlog(": ");
3113 sppp_print_string((char*)(h + 1), len - 4);
3114 }
3115 addlog("\n");
3116 } else
3117 log(LOG_INFO, SPP_FMT "chap failure\n",
3118 SPP_ARGS(ifp));
3119 /* await LCP shutdown by authenticator */
3120 break;
3121
3122 /* response is my authproto */
3123 case CHAP_RESPONSE:
3124 value = 1 + (u_char*)(h+1);
3125 value_len = value[-1];
3126 name = value + value_len;
3127 name_len = len - value_len - 5;
3128 if (name_len < 0) {
3129 if (debug) {
3130 log(LOG_DEBUG,
3131 SPP_FMT "chap corrupted response "
3132 "<%s id=0x%x len=%d",
3133 SPP_ARGS(ifp),
3134 sppp_auth_type_name(PPP_CHAP, h->type),
3135 h->ident, ntohs(h->len));
3136 if (len > 4)
3137 sppp_print_bytes((u_char*)(h+1), len-4);
3138 addlog(">\n");
3139 }
3140 break;
3141 }
3142 if (h->ident != sp->confid[IDX_CHAP]) {
3143 if (debug)
3144 log(LOG_DEBUG,
3145 SPP_FMT "chap dropping response for old ID "
3146 "(got %d, expected %d)\n",
3147 SPP_ARGS(ifp),
3148 h->ident, sp->confid[IDX_CHAP]);
3149 break;
3150 }
3151 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
3152 || bcmp(name, sp->hisauth.name, name_len) != 0) {
3153 log(LOG_INFO, SPP_FMT "chap response, his name ",
3154 SPP_ARGS(ifp));
3155 sppp_print_string(name, name_len);
3156 addlog(" != expected ");
3157 sppp_print_string(sp->hisauth.name,
3158 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
3159 addlog("\n");
3160 }
3161 if (debug) {
3162 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
3163 "<%s id=0x%x len=%d name=",
3164 SPP_ARGS(ifp),
3165 sppp_state_name(sp->state[IDX_CHAP]),
3166 sppp_auth_type_name(PPP_CHAP, h->type),
3167 h->ident, ntohs (h->len));
3168 sppp_print_string((char*)name, name_len);
3169 addlog(" value-size=%d value=", value_len);
3170 sppp_print_bytes(value, value_len);
3171 addlog(">\n");
3172 }
3173 if (value_len != AUTHKEYLEN) {
3174 if (debug)
3175 log(LOG_DEBUG,
3176 SPP_FMT "chap bad hash value length: "
3177 "%d bytes, should be %d\n",
3178 SPP_ARGS(ifp), value_len,
3179 AUTHKEYLEN);
3180 break;
3181 }
3182
3183 MD5Init(&ctx);
3184 MD5Update(&ctx, &h->ident, 1);
3185 MD5Update(&ctx, sp->hisauth.secret,
3186 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
3187 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
3188 MD5Final(digest, &ctx);
3189
3190 #define FAILMSG "Failed..."
3191 #define SUCCMSG "Welcome!"
3192
3193 if (value_len != sizeof digest ||
3194 bcmp(digest, value, value_len) != 0) {
3195 /* action scn, tld */
3196 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
3197 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
3198 0);
3199 chap.tld(sp);
3200 break;
3201 }
3202 /* action sca, perhaps tlu */
3203 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
3204 sp->state[IDX_CHAP] == STATE_OPENED)
3205 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
3206 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
3207 0);
3208 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
3209 sppp_cp_change_state(&chap, sp, STATE_OPENED);
3210 chap.tlu(sp);
3211 }
3212 break;
3213
3214 default:
3215 /* Unknown CHAP packet type -- ignore. */
3216 if (debug) {
3217 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
3218 "<0x%x id=0x%xh len=%d",
3219 SPP_ARGS(ifp),
3220 sppp_state_name(sp->state[IDX_CHAP]),
3221 h->type, h->ident, ntohs(h->len));
3222 if (len > 4)
3223 sppp_print_bytes((u_char*)(h+1), len-4);
3224 addlog(">\n");
3225 }
3226 break;
3227
3228 }
3229 }
3230
3231 static void
3232 sppp_chap_init(struct sppp *sp)
3233 {
3234 /* Chap doesn't have STATE_INITIAL at all. */
3235 sp->state[IDX_CHAP] = STATE_CLOSED;
3236 sp->fail_counter[IDX_CHAP] = 0;
3237 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3238 callout_handle_init(&sp->ch[IDX_CHAP]);
3239 #endif
3240 }
3241
3242 static void
3243 sppp_chap_open(struct sppp *sp)
3244 {
3245 if (sp->myauth.proto == PPP_CHAP &&
3246 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
3247 /* we are authenticator for CHAP, start it */
3248 chap.scr(sp);
3249 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
3250 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
3251 }
3252 /* nothing to be done if we are peer, await a challenge */
3253 }
3254
3255 static void
3256 sppp_chap_close(struct sppp *sp)
3257 {
3258 if (sp->state[IDX_CHAP] != STATE_CLOSED)
3259 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
3260 }
3261
3262 static void
3263 sppp_chap_TO(void *cookie)
3264 {
3265 struct sppp *sp = (struct sppp *)cookie;
3266 STDDCL;
3267 int s;
3268
3269 s = splimp();
3270 if (debug)
3271 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
3272 SPP_ARGS(ifp),
3273 sppp_state_name(sp->state[IDX_CHAP]),
3274 sp->rst_counter[IDX_CHAP]);
3275
3276 if (--sp->rst_counter[IDX_CHAP] < 0)
3277 /* TO- event */
3278 switch (sp->state[IDX_CHAP]) {
3279 case STATE_REQ_SENT:
3280 chap.tld(sp);
3281 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
3282 break;
3283 }
3284 else
3285 /* TO+ (or TO*) event */
3286 switch (sp->state[IDX_CHAP]) {
3287 case STATE_OPENED:
3288 /* TO* event */
3289 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
3290 /* fall through */
3291 case STATE_REQ_SENT:
3292 chap.scr(sp);
3293 /* sppp_cp_change_state() will restart the timer */
3294 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
3295 break;
3296 }
3297
3298 splx(s);
3299 }
3300
3301 static void
3302 sppp_chap_tlu(struct sppp *sp)
3303 {
3304 STDDCL;
3305 int i, x;
3306
3307 i = 0;
3308 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
3309
3310 /*
3311 * Some broken CHAP implementations (Conware CoNet, firmware
3312 * 4.0.?) don't want to re-authenticate their CHAP once the
3313 * initial challenge-response exchange has taken place.
3314 * Provide for an option to avoid rechallenges.
3315 */
3316 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
3317 /*
3318 * Compute the re-challenge timeout. This will yield
3319 * a number between 300 and 810 seconds.
3320 */
3321 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
3322 TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]);
3323 }
3324
3325 if (debug) {
3326 log(LOG_DEBUG,
3327 SPP_FMT "chap %s, ",
3328 SPP_ARGS(ifp),
3329 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
3330 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
3331 addlog("next re-challenge in %d seconds\n", i);
3332 else
3333 addlog("re-challenging supressed\n");
3334 }
3335
3336 x = splimp();
3337 /* indicate to LCP that we need to be closed down */
3338 sp->lcp.protos |= (1 << IDX_CHAP);
3339
3340 if (sp->pp_flags & PP_NEEDAUTH) {
3341 /*
3342 * Remote is authenticator, but his auth proto didn't
3343 * complete yet. Defer the transition to network
3344 * phase.
3345 */
3346 splx(x);
3347 return;
3348 }
3349 splx(x);
3350
3351 /*
3352 * If we are already in phase network, we are done here. This
3353 * is the case if this is a dummy tlu event after a re-challenge.
3354 */
3355 if (sp->pp_phase != PHASE_NETWORK)
3356 sppp_phase_network(sp);
3357 }
3358
3359 static void
3360 sppp_chap_tld(struct sppp *sp)
3361 {
3362 STDDCL;
3363
3364 if (debug)
3365 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
3366 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]);
3367 sp->lcp.protos &= ~(1 << IDX_CHAP);
3368
3369 lcp.Close(sp);
3370 }
3371
3372 static void
3373 sppp_chap_scr(struct sppp *sp)
3374 {
3375 u_long *ch, seed;
3376 u_char clen;
3377
3378 /* Compute random challenge. */
3379 ch = (u_long *)sp->myauth.challenge;
3380 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3381 read_random(&seed, sizeof seed);
3382 #else
3383 {
3384 struct timeval tv;
3385 microtime(&tv);
3386 seed = tv.tv_sec ^ tv.tv_usec;
3387 }
3388 #endif
3389 ch[0] = seed ^ random();
3390 ch[1] = seed ^ random();
3391 ch[2] = seed ^ random();
3392 ch[3] = seed ^ random();
3393 clen = AUTHKEYLEN;
3394
3395 sp->confid[IDX_CHAP] = ++sp->pp_seq;
3396
3397 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
3398 sizeof clen, (const char *)&clen,
3399 (size_t)AUTHKEYLEN, sp->myauth.challenge,
3400 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
3401 sp->myauth.name,
3402 0);
3403 }
3404 \f/*
3405 *--------------------------------------------------------------------------*
3406 * *
3407 * The PAP implementation. *
3408 * *
3409 *--------------------------------------------------------------------------*
3410 */
3411 /*
3412 * For PAP, we need to keep a little state also if we are the peer, not the
3413 * authenticator. This is since we don't get a request to authenticate, but
3414 * have to repeatedly authenticate ourself until we got a response (or the
3415 * retry counter is expired).
3416 */
3417
3418 /*
3419 * Handle incoming PAP packets. */
3420 static void
3421 sppp_pap_input(struct sppp *sp, struct mbuf *m)
3422 {
3423 STDDCL;
3424 struct lcp_header *h;
3425 int len, x;
3426 u_char *name, *passwd, mlen;
3427 int name_len, passwd_len;
3428
3429 len = m->m_pkthdr.len;
3430 if (len < 5) {
3431 if (debug)
3432 log(LOG_DEBUG,
3433 SPP_FMT "pap invalid packet length: %d bytes\n",
3434 SPP_ARGS(ifp), len);
3435 return;
3436 }
3437 h = mtod (m, struct lcp_header*);
3438 if (len > ntohs (h->len))
3439 len = ntohs (h->len);
3440 switch (h->type) {
3441 /* PAP request is my authproto */
3442 case PAP_REQ:
3443 name = 1 + (u_char*)(h+1);
3444 name_len = name[-1];
3445 passwd = name + name_len + 1;
3446 if (name_len > len - 6 ||
3447 (passwd_len = passwd[-1]) > len - 6 - name_len) {
3448 if (debug) {
3449 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
3450 "<%s id=0x%x len=%d",
3451 SPP_ARGS(ifp),
3452 sppp_auth_type_name(PPP_PAP, h->type),
3453 h->ident, ntohs(h->len));
3454 if (len > 4)
3455 sppp_print_bytes((u_char*)(h+1), len-4);
3456 addlog(">\n");
3457 }
3458 break;
3459 }
3460 if (debug) {
3461 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
3462 "<%s id=0x%x len=%d name=",
3463 SPP_ARGS(ifp),
3464 sppp_state_name(sp->state[IDX_PAP]),
3465 sppp_auth_type_name(PPP_PAP, h->type),
3466 h->ident, ntohs(h->len));
3467 sppp_print_string((char*)name, name_len);
3468 addlog(" passwd=");
3469 sppp_print_string((char*)passwd, passwd_len);
3470 addlog(">\n");
3471 }
3472 if (name_len > AUTHNAMELEN ||
3473 passwd_len > AUTHKEYLEN ||
3474 bcmp(name, sp->hisauth.name, name_len) != 0 ||
3475 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
3476 /* action scn, tld */
3477 mlen = sizeof(FAILMSG) - 1;
3478 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
3479 sizeof mlen, (const char *)&mlen,
3480 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
3481 0);
3482 pap.tld(sp);
3483 break;
3484 }
3485 /* action sca, perhaps tlu */
3486 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
3487 sp->state[IDX_PAP] == STATE_OPENED) {
3488 mlen = sizeof(SUCCMSG) - 1;
3489 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
3490 sizeof mlen, (const char *)&mlen,
3491 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
3492 0);
3493 }
3494 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
3495 sppp_cp_change_state(&pap, sp, STATE_OPENED);
3496 pap.tlu(sp);
3497 }
3498 break;
3499
3500 /* ack and nak are his authproto */
3501 case PAP_ACK:
3502 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
3503 if (debug) {
3504 log(LOG_DEBUG, SPP_FMT "pap success",
3505 SPP_ARGS(ifp));
3506 name_len = *((char *)h);
3507 if (len > 5 && name_len) {
3508 addlog(": ");
3509 sppp_print_string((char*)(h+1), name_len);
3510 }
3511 addlog("\n");
3512 }
3513 x = splimp();
3514 sp->pp_flags &= ~PP_NEEDAUTH;
3515 if (sp->myauth.proto == PPP_PAP &&
3516 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
3517 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
3518 /*
3519 * We are authenticator for PAP but didn't
3520 * complete yet. Leave it to tlu to proceed
3521 * to network phase.
3522 */
3523 splx(x);
3524 break;
3525 }
3526 splx(x);
3527 sppp_phase_network(sp);
3528 break;
3529
3530 case PAP_NAK:
3531 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
3532 if (debug) {
3533 log(LOG_INFO, SPP_FMT "pap failure",
3534 SPP_ARGS(ifp));
3535 name_len = *((char *)h);
3536 if (len > 5 && name_len) {
3537 addlog(": ");
3538 sppp_print_string((char*)(h+1), name_len);
3539 }
3540 addlog("\n");
3541 } else
3542 log(LOG_INFO, SPP_FMT "pap failure\n",
3543 SPP_ARGS(ifp));
3544 /* await LCP shutdown by authenticator */
3545 break;
3546
3547 default:
3548 /* Unknown PAP packet type -- ignore. */
3549 if (debug) {
3550 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
3551 "<0x%x id=0x%x len=%d",
3552 SPP_ARGS(ifp),
3553 h->type, h->ident, ntohs(h->len));
3554 if (len > 4)
3555 sppp_print_bytes((u_char*)(h+1), len-4);
3556 addlog(">\n");
3557 }
3558 break;
3559
3560 }
3561 }
3562
3563 static void
3564 sppp_pap_init(struct sppp *sp)
3565 {
3566 /* PAP doesn't have STATE_INITIAL at all. */
3567 sp->state[IDX_PAP] = STATE_CLOSED;
3568 sp->fail_counter[IDX_PAP] = 0;
3569 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3570 callout_handle_init(&sp->ch[IDX_PAP]);
3571 callout_handle_init(&sp->pap_my_to_ch);
3572 #endif
3573 }
3574
3575 static void
3576 sppp_pap_open(struct sppp *sp)
3577 {
3578 if (sp->hisauth.proto == PPP_PAP &&
3579 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
3580 /* we are authenticator for PAP, start our timer */
3581 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
3582 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
3583 }
3584 if (sp->myauth.proto == PPP_PAP) {
3585 /* we are peer, send a request, and start a timer */
3586 pap.scr(sp);
3587 TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout,
3588 sp->pap_my_to_ch);
3589 }
3590 }
3591
3592 static void
3593 sppp_pap_close(struct sppp *sp)
3594 {
3595 if (sp->state[IDX_PAP] != STATE_CLOSED)
3596 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
3597 }
3598
3599 /*
3600 * That's the timeout routine if we are authenticator. Since the
3601 * authenticator is basically passive in PAP, we can't do much here.
3602 */
3603 static void
3604 sppp_pap_TO(void *cookie)
3605 {
3606 struct sppp *sp = (struct sppp *)cookie;
3607 STDDCL;
3608 int s;
3609
3610 s = splimp();
3611 if (debug)
3612 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
3613 SPP_ARGS(ifp),
3614 sppp_state_name(sp->state[IDX_PAP]),
3615 sp->rst_counter[IDX_PAP]);
3616
3617 if (--sp->rst_counter[IDX_PAP] < 0)
3618 /* TO- event */
3619 switch (sp->state[IDX_PAP]) {
3620 case STATE_REQ_SENT:
3621 pap.tld(sp);
3622 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
3623 break;
3624 }
3625 else
3626 /* TO+ event, not very much we could do */
3627 switch (sp->state[IDX_PAP]) {
3628 case STATE_REQ_SENT:
3629 /* sppp_cp_change_state() will restart the timer */
3630 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
3631 break;
3632 }
3633
3634 splx(s);
3635 }
3636
3637 /*
3638 * That's the timeout handler if we are peer. Since the peer is active,
3639 * we need to retransmit our PAP request since it is apparently lost.
3640 * XXX We should impose a max counter.
3641 */
3642 static void
3643 sppp_pap_my_TO(void *cookie)
3644 {
3645 struct sppp *sp = (struct sppp *)cookie;
3646 STDDCL;
3647
3648 if (debug)
3649 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
3650 SPP_ARGS(ifp));
3651
3652 pap.scr(sp);
3653 }
3654
3655 static void
3656 sppp_pap_tlu(struct sppp *sp)
3657 {
3658 STDDCL;
3659 int x;
3660
3661 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
3662
3663 if (debug)
3664 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
3665 SPP_ARGS(ifp), pap.name);
3666
3667 x = splimp();
3668 /* indicate to LCP that we need to be closed down */
3669 sp->lcp.protos |= (1 << IDX_PAP);
3670
3671 if (sp->pp_flags & PP_NEEDAUTH) {
3672 /*
3673 * Remote is authenticator, but his auth proto didn't
3674 * complete yet. Defer the transition to network
3675 * phase.
3676 */
3677 splx(x);
3678 return;
3679 }
3680 splx(x);
3681 sppp_phase_network(sp);
3682 }
3683
3684 static void
3685 sppp_pap_tld(struct sppp *sp)
3686 {
3687 STDDCL;
3688
3689 if (debug)
3690 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
3691 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]);
3692 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
3693 sp->lcp.protos &= ~(1 << IDX_PAP);
3694
3695 lcp.Close(sp);
3696 }
3697
3698 static void
3699 sppp_pap_scr(struct sppp *sp)
3700 {
3701 u_char idlen, pwdlen;
3702
3703 sp->confid[IDX_PAP] = ++sp->pp_seq;
3704 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
3705 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
3706
3707 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
3708 sizeof idlen, (const char *)&idlen,
3709 (size_t)idlen, sp->myauth.name,
3710 sizeof pwdlen, (const char *)&pwdlen,
3711 (size_t)pwdlen, sp->myauth.secret,
3712 0);
3713 }
3714 \f/*
3715 * Random miscellaneous functions.
3716 */
3717
3718 /*
3719 * Send a PAP or CHAP proto packet.
3720 *
3721 * Varadic function, each of the elements for the ellipsis is of type
3722 * ``size_t mlen, const u_char *msg''. Processing will stop iff
3723 * mlen == 0.
3724 * NOTE: never declare variadic functions with types subject to type
3725 * promotion (i.e. u_char). This is asking for big trouble depending
3726 * on the architecture you are on...
3727 */
3728
3729 static void
3730 sppp_auth_send(const struct cp *cp, struct sppp *sp,
3731 unsigned int type, unsigned int id,
3732 ...)
3733 {
3734 STDDCL;
3735 struct ppp_header *h;
3736 struct lcp_header *lh;
3737 struct mbuf *m;
3738 u_char *p;
3739 int len;
3740 unsigned int mlen;
3741 const char *msg;
3742 va_list ap;
3743
3744 MGETHDR (m, M_DONTWAIT, MT_DATA);
3745 if (! m)
3746 return;
3747 m->m_pkthdr.rcvif = 0;
3748
3749 h = mtod (m, struct ppp_header*);
3750 h->address = PPP_ALLSTATIONS; /* broadcast address */
3751 h->control = PPP_UI; /* Unnumbered Info */
3752 h->protocol = htons(cp->proto);
3753
3754 lh = (struct lcp_header*)(h + 1);
3755 lh->type = type;
3756 lh->ident = id;
3757 p = (u_char*) (lh+1);
3758
3759 va_start(ap, id);
3760 len = 0;
3761
3762 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
3763 msg = va_arg(ap, const char *);
3764 len += mlen;
3765 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
3766 va_end(ap);
3767 m_freem(m);
3768 return;
3769 }
3770
3771 bcopy(msg, p, mlen);
3772 p += mlen;
3773 }
3774 va_end(ap);
3775
3776 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
3777 lh->len = htons (LCP_HEADER_LEN + len);
3778
3779 if (debug) {
3780 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
3781 SPP_ARGS(ifp), cp->name,
3782 sppp_auth_type_name(cp->proto, lh->type),
3783 lh->ident, ntohs(lh->len));
3784 if (len)
3785 sppp_print_bytes((u_char*) (lh+1), len);
3786 addlog(">\n");
3787 }
3788 if (IF_QFULL (&sp->pp_cpq)) {
3789 IF_DROP (&sp->pp_fastq);
3790 IF_DROP (&ifp->if_snd);
3791 m_freem (m);
3792 ++ifp->if_oerrors;
3793 } else
3794 IF_ENQUEUE (&sp->pp_cpq, m);
3795 if (! (ifp->if_flags & IFF_OACTIVE))
3796 (*ifp->if_start) (ifp);
3797 ifp->if_obytes += m->m_pkthdr.len + 3;
3798 }
3799
3800 /*
3801 * Flush interface queue.
3802 */
3803 static void
3804 sppp_qflush(struct ifqueue *ifq)
3805 {
3806 struct mbuf *m, *n;
3807
3808 n = ifq->ifq_head;
3809 while ((m = n)) {
3810 n = m->m_act;
3811 m_freem (m);
3812 }
3813 ifq->ifq_head = 0;
3814 ifq->ifq_tail = 0;
3815 ifq->ifq_len = 0;
3816 }
3817
3818 /*
3819 * Send keepalive packets, every 10 seconds.
3820 */
3821 static void
3822 sppp_keepalive(void *dummy)
3823 {
3824 struct sppp *sp;
3825 int s;
3826
3827 s = splimp();
3828 for (sp=spppq; sp; sp=sp->pp_next) {
3829 struct ifnet *ifp = &sp->pp_if;
3830
3831 /* Keepalive mode disabled or channel down? */
3832 if (! (sp->pp_flags & PP_KEEPALIVE) ||
3833 ! (ifp->if_flags & IFF_RUNNING))
3834 continue;
3835
3836 /* No keepalive in PPP mode if LCP not opened yet. */
3837 if (! (sp->pp_flags & PP_CISCO) &&
3838 sp->pp_phase < PHASE_AUTHENTICATE)
3839 continue;
3840
3841 if (sp->pp_alivecnt == MAXALIVECNT) {
3842 /* No keepalive packets got. Stop the interface. */
3843 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
3844 if_down (ifp);
3845 sppp_qflush (&sp->pp_cpq);
3846 if (! (sp->pp_flags & PP_CISCO)) {
3847 /* XXX */
3848 /* Shut down the PPP link. */
3849 lcp.Down(sp);
3850 /* Initiate negotiation. XXX */
3851 lcp.Up(sp);
3852 }
3853 }
3854 if (sp->pp_alivecnt <= MAXALIVECNT)
3855 ++sp->pp_alivecnt;
3856 if (sp->pp_flags & PP_CISCO)
3857 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
3858 sp->pp_rseq);
3859 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
3860 long nmagic = htonl (sp->lcp.magic);
3861 sp->lcp.echoid = ++sp->pp_seq;
3862 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
3863 sp->lcp.echoid, 4, &nmagic);
3864 }
3865 }
3866 splx(s);
3867 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch);
3868 }
3869
3870 /*
3871 * Get both IP addresses.
3872 */
3873 static void
3874 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
3875 {
3876 struct ifnet *ifp = &sp->pp_if;
3877 struct ifaddr *ifa;
3878 struct sockaddr_in *si, *sm;
3879 u_long ssrc, ddst;
3880
3881 sm = NULL;
3882 ssrc = ddst = 0L;
3883 /*
3884 * Pick the first AF_INET address from the list,
3885 * aliases don't make any sense on a p2p link anyway.
3886 */
3887 si = 0;
3888 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3889 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
3890 #elif defined(__NetBSD__) || defined (__OpenBSD__)
3891 for (ifa = ifp->if_addrlist.tqh_first;
3892 ifa;
3893 ifa = ifa->ifa_list.tqe_next)
3894 #else
3895 for (ifa = ifp->if_addrlist;
3896 ifa;
3897 ifa = ifa->ifa_next)
3898 #endif
3899 if (ifa->ifa_addr->sa_family == AF_INET) {
3900 si = (struct sockaddr_in *)ifa->ifa_addr;
3901 sm = (struct sockaddr_in *)ifa->ifa_netmask;
3902 if (si)
3903 break;
3904 }
3905 if (ifa) {
3906 if (si && si->sin_addr.s_addr) {
3907 ssrc = si->sin_addr.s_addr;
3908 if (srcmask)
3909 *srcmask = ntohl(sm->sin_addr.s_addr);
3910 }
3911
3912 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
3913 if (si && si->sin_addr.s_addr)
3914 ddst = si->sin_addr.s_addr;
3915 }
3916
3917 if (dst) *dst = ntohl(ddst);
3918 if (src) *src = ntohl(ssrc);
3919 }
3920
3921 /*
3922 * Set my IP address. Must be called at splimp.
3923 */
3924 static void
3925 sppp_set_ip_addr(struct sppp *sp, u_long src)
3926 {
3927 STDDCL;
3928 struct ifaddr *ifa;
3929 struct sockaddr_in *si;
3930
3931 /*
3932 * Pick the first AF_INET address from the list,
3933 * aliases don't make any sense on a p2p link anyway.
3934 */
3935 si = 0;
3936 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3937 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
3938 #elif defined(__NetBSD__) || defined (__OpenBSD__)
3939 for (ifa = ifp->if_addrlist.tqh_first;
3940 ifa;
3941 ifa = ifa->ifa_list.tqe_next)
3942 #else
3943 for (ifa = ifp->if_addrlist;
3944 ifa;
3945 ifa = ifa->ifa_next)
3946 #endif
3947 {
3948 if (ifa->ifa_addr->sa_family == AF_INET)
3949 {
3950 si = (struct sockaddr_in *)ifa->ifa_addr;
3951 if (si)
3952 break;
3953 }
3954 }
3955
3956 if (ifa && si)
3957 {
3958 int error;
3959 #if __NetBSD_Version__ >= 103080000
3960 struct sockaddr_in new_sin = *si;
3961
3962 new_sin.sin_addr.s_addr = htonl(src);
3963 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
3964 if(debug && error)
3965 {
3966 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
3967 " failed, error=%d\n", SPP_ARGS(ifp), error);
3968 }
3969 #else
3970 /* delete old route */
3971 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
3972 if(debug && error)
3973 {
3974 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
3975 SPP_ARGS(ifp), error);
3976 }
3977
3978 /* set new address */
3979 si->sin_addr.s_addr = htonl(src);
3980
3981 /* add new route */
3982 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
3983 if (debug && error)
3984 {
3985 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
3986 SPP_ARGS(ifp), error);
3987 }
3988 #endif
3989 }
3990 }
3991
3992 static int
3993 sppp_params(struct sppp *sp, u_long cmd, void *data)
3994 {
3995 u_long subcmd;
3996 struct ifreq *ifr = (struct ifreq *)data;
3997 struct spppreq spr;
3998
3999 /*
4000 * ifr->ifr_data is supposed to point to a struct spppreq.
4001 * Check the cmd word first before attempting to fetch all the
4002 * data.
4003 */
4004 if ((subcmd = fuword(ifr->ifr_data)) == -1)
4005 return EFAULT;
4006
4007 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0)
4008 return EFAULT;
4009
4010 switch (subcmd) {
4011 case SPPPIOGDEFS:
4012 if (cmd != SIOCGIFGENERIC)
4013 return EINVAL;
4014 /*
4015 * We copy over the entire current state, but clean
4016 * out some of the stuff we don't wanna pass up.
4017 * Remember, SIOCGIFGENERIC is unprotected, and can be
4018 * called by any user. No need to ever get PAP or
4019 * CHAP secrets back to userland anyway.
4020 */
4021 bcopy(sp, &spr.defs, sizeof(struct sppp));
4022 bzero(spr.defs.myauth.secret, AUTHKEYLEN);
4023 bzero(spr.defs.myauth.challenge, AUTHKEYLEN);
4024 bzero(spr.defs.hisauth.secret, AUTHKEYLEN);
4025 bzero(spr.defs.hisauth.challenge, AUTHKEYLEN);
4026 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr);
4027
4028 case SPPPIOSDEFS:
4029 if (cmd != SIOCSIFGENERIC)
4030 return EINVAL;
4031 /*
4032 * We have a very specific idea of which fields we allow
4033 * being passed back from userland, so to not clobber our
4034 * current state. For one, we only allow setting
4035 * anything if LCP is in dead phase. Once the LCP
4036 * negotiations started, the authentication settings must
4037 * not be changed again. (The administrator can force an
4038 * ifconfig down in order to get LCP back into dead
4039 * phase.)
4040 *
4041 * Also, we only allow for authentication parameters to be
4042 * specified.
4043 *
4044 * XXX Should allow to set or clear pp_flags.
4045 *
4046 * Finally, if the respective authentication protocol to
4047 * be used is set differently than 0, but the secret is
4048 * passed as all zeros, we don't trash the existing secret.
4049 * This allows an administrator to change the system name
4050 * only without clobbering the secret (which he didn't get
4051 * back in a previous SPPPIOGDEFS call). However, the
4052 * secrets are cleared if the authentication protocol is
4053 * reset to 0.
4054 */
4055 if (sp->pp_phase != PHASE_DEAD)
4056 return EBUSY;
4057
4058 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP &&
4059 spr.defs.myauth.proto != PPP_CHAP) ||
4060 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP &&
4061 spr.defs.hisauth.proto != PPP_CHAP))
4062 return EINVAL;
4063
4064 if (spr.defs.myauth.proto == 0)
4065 /* resetting myauth */
4066 bzero(&sp->myauth, sizeof sp->myauth);
4067 else {
4068 /* setting/changing myauth */
4069 sp->myauth.proto = spr.defs.myauth.proto;
4070 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
4071 if (spr.defs.myauth.secret[0] != '\0')
4072 bcopy(spr.defs.myauth.secret, sp->myauth.secret,
4073 AUTHKEYLEN);
4074 }
4075 if (spr.defs.hisauth.proto == 0)
4076 /* resetting hisauth */
4077 bzero(&sp->hisauth, sizeof sp->hisauth);
4078 else {
4079 /* setting/changing hisauth */
4080 sp->hisauth.proto = spr.defs.hisauth.proto;
4081 sp->hisauth.flags = spr.defs.hisauth.flags;
4082 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
4083 if (spr.defs.hisauth.secret[0] != '\0')
4084 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret,
4085 AUTHKEYLEN);
4086 }
4087 break;
4088
4089 default:
4090 return EINVAL;
4091 }
4092
4093 return 0;
4094 }
4095
4096 static void
4097 sppp_phase_network(struct sppp *sp)
4098 {
4099 STDDCL;
4100 int i;
4101 u_long mask;
4102
4103 sp->pp_phase = PHASE_NETWORK;
4104
4105 if (debug)
4106 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
4107 sppp_phase_name(sp->pp_phase));
4108
4109 /* Notify NCPs now. */
4110 for (i = 0; i < IDX_COUNT; i++)
4111 if ((cps[i])->flags & CP_NCP)
4112 (cps[i])->Open(sp);
4113
4114 /* Send Up events to all NCPs. */
4115 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
4116 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP))
4117 (cps[i])->Up(sp);
4118
4119 /* if no NCP is starting, all this was in vain, close down */
4120 sppp_lcp_check_and_close(sp);
4121 }
4122
4123
4124 static const char *
4125 sppp_cp_type_name(u_char type)
4126 {
4127 static char buf[12];
4128 switch (type) {
4129 case CONF_REQ: return "conf-req";
4130 case CONF_ACK: return "conf-ack";
4131 case CONF_NAK: return "conf-nak";
4132 case CONF_REJ: return "conf-rej";
4133 case TERM_REQ: return "term-req";
4134 case TERM_ACK: return "term-ack";
4135 case CODE_REJ: return "code-rej";
4136 case PROTO_REJ: return "proto-rej";
4137 case ECHO_REQ: return "echo-req";
4138 case ECHO_REPLY: return "echo-reply";
4139 case DISC_REQ: return "discard-req";
4140 }
4141 snprintf (buf, sizeof(buf), "0x%x", type);
4142 return buf;
4143 }
4144
4145 static const char *
4146 sppp_auth_type_name(u_short proto, u_char type)
4147 {
4148 static char buf[12];
4149 switch (proto) {
4150 case PPP_CHAP:
4151 switch (type) {
4152 case CHAP_CHALLENGE: return "challenge";
4153 case CHAP_RESPONSE: return "response";
4154 case CHAP_SUCCESS: return "success";
4155 case CHAP_FAILURE: return "failure";
4156 }
4157 case PPP_PAP:
4158 switch (type) {
4159 case PAP_REQ: return "req";
4160 case PAP_ACK: return "ack";
4161 case PAP_NAK: return "nak";
4162 }
4163 }
4164 snprintf (buf, sizeof(buf), "0x%x", type);
4165 return buf;
4166 }
4167
4168 static const char *
4169 sppp_lcp_opt_name(u_char opt)
4170 {
4171 static char buf[12];
4172 switch (opt) {
4173 case LCP_OPT_MRU: return "mru";
4174 case LCP_OPT_ASYNC_MAP: return "async-map";
4175 case LCP_OPT_AUTH_PROTO: return "auth-proto";
4176 case LCP_OPT_QUAL_PROTO: return "qual-proto";
4177 case LCP_OPT_MAGIC: return "magic";
4178 case LCP_OPT_PROTO_COMP: return "proto-comp";
4179 case LCP_OPT_ADDR_COMP: return "addr-comp";
4180 }
4181 snprintf (buf, sizeof(buf), "0x%x", opt);
4182 return buf;
4183 }
4184
4185 static const char *
4186 sppp_ipcp_opt_name(u_char opt)
4187 {
4188 static char buf[12];
4189 switch (opt) {
4190 case IPCP_OPT_ADDRESSES: return "addresses";
4191 case IPCP_OPT_COMPRESSION: return "compression";
4192 case IPCP_OPT_ADDRESS: return "address";
4193 }
4194 snprintf (buf, sizeof(buf), "0x%x", opt);
4195 return buf;
4196 }
4197
4198 static const char *
4199 sppp_state_name(int state)
4200 {
4201 switch (state) {
4202 case STATE_INITIAL: return "initial";
4203 case STATE_STARTING: return "starting";
4204 case STATE_CLOSED: return "closed";
4205 case STATE_STOPPED: return "stopped";
4206 case STATE_CLOSING: return "closing";
4207 case STATE_STOPPING: return "stopping";
4208 case STATE_REQ_SENT: return "req-sent";
4209 case STATE_ACK_RCVD: return "ack-rcvd";
4210 case STATE_ACK_SENT: return "ack-sent";
4211 case STATE_OPENED: return "opened";
4212 }
4213 return "illegal";
4214 }
4215
4216 static const char *
4217 sppp_phase_name(enum ppp_phase phase)
4218 {
4219 switch (phase) {
4220 case PHASE_DEAD: return "dead";
4221 case PHASE_ESTABLISH: return "establish";
4222 case PHASE_TERMINATE: return "terminate";
4223 case PHASE_AUTHENTICATE: return "authenticate";
4224 case PHASE_NETWORK: return "network";
4225 }
4226 return "illegal";
4227 }
4228
4229 static const char *
4230 sppp_proto_name(u_short proto)
4231 {
4232 static char buf[12];
4233 switch (proto) {
4234 case PPP_LCP: return "lcp";
4235 case PPP_IPCP: return "ipcp";
4236 case PPP_PAP: return "pap";
4237 case PPP_CHAP: return "chap";
4238 }
4239 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto);
4240 return buf;
4241 }
4242
4243 static void
4244 sppp_print_bytes(const u_char *p, u_short len)
4245 {
4246 addlog(" %02x", *p++);
4247 while (--len > 0)
4248 addlog("-%02x", *p++);
4249 }
4250
4251 static void
4252 sppp_print_string(const char *p, u_short len)
4253 {
4254 u_char c;
4255
4256 while (len-- > 0) {
4257 c = *p++;
4258 /*
4259 * Print only ASCII chars directly. RFC 1994 recommends
4260 * using only them, but we don't rely on it. */
4261 if (c < ' ' || c > '~')
4262 addlog("\\x%x", c);
4263 else
4264 addlog("%c", c);
4265 }
4266 }
4267
4268 static const char *
4269 sppp_dotted_quad(u_long addr)
4270 {
4271 static char s[16];
4272 sprintf(s, "%d.%d.%d.%d",
4273 (int)((addr >> 24) & 0xff),
4274 (int)((addr >> 16) & 0xff),
4275 (int)((addr >> 8) & 0xff),
4276 (int)(addr & 0xff));
4277 return s;
4278 }
4279
4280 static int
4281 sppp_strnlen(u_char *p, int max)
4282 {
4283 int len;
4284
4285 for (len = 0; len < max && *p; ++p)
4286 ++len;
4287 return len;
4288 }
4289
4290 /* a dummy, used to drop uninteresting events */
4291 static void
4292 sppp_null(struct sppp *unused)
4293 {
4294 /* do just nothing */
4295 }
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