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kernel/libkern: Add strnlen() (from FreeBSD) and use it.
[dragonfly.git] / sys / net / sppp / if_spppsubr.c
blob02a9748a0bc6d8b563df1caf165a15ca3bd9220e
1 /*
2 * Synchronous PPP/Cisco link level subroutines.
3 * Keepalive protocol implemented in both Cisco and PPP modes.
4 *
5 * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
6 * Author: Serge Vakulenko, <vak@cronyx.ru>
7 *
8 * Heavily revamped to conform to RFC 1661.
9 * Copyright (C) 1997, 2001 Joerg Wunsch.
10 *
11 * This software is distributed with NO WARRANTIES, not even the implied
12 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 *
14 * Authors grant any other persons or organisations permission to use
15 * or modify this software as long as this message is kept with the software,
16 * all derivative works or modified versions.
17 *
18 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
19 *
20 * $FreeBSD: src/sys/net/if_spppsubr.c,v 1.59.2.13 2002/07/03 15:44:41 joerg Exp $
21 */
22
23 #include <sys/param.h>
24 #include <sys/libkern.h>
25
26 #include "opt_inet.h"
27 #include "opt_inet6.h"
28
29 #include <sys/systm.h>
30 #include <sys/kernel.h>
31 #include <sys/module.h>
32 #include <sys/sockio.h>
33 #include <sys/socket.h>
34 #include <sys/syslog.h>
35 #include <sys/random.h>
36 #include <sys/thread2.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/md5.h>
40
41 #include <net/if.h>
42 #include <net/ifq_var.h>
43 #include <net/netisr.h>
44 #include <net/if_types.h>
45 #include <net/route.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 #include <net/slcompress.h>
50
51 #include <machine/stdarg.h>
52
53 #include <netinet/in_var.h>
54
55 #ifdef INET
56 #include <netinet/tcp.h>
57 #endif
58
59 #include <netinet/if_ether.h>
60
61 #include "if_sppp.h"
62
63 #define IOCTL_CMD_T u_long
64 #define MAXALIVECNT 3 /* max. alive packets */
65
66 /*
67 * Interface flags that can be set in an ifconfig command.
68 *
69 * Setting link0 will make the link passive, i.e. it will be marked
70 * as being administrative openable, but won't be opened to begin
71 * with. Incoming calls will be answered, or subsequent calls with
72 * -link1 will cause the administrative open of the LCP layer.
73 *
74 * Setting link1 will cause the link to auto-dial only as packets
75 * arrive to be sent.
76 *
77 * Setting IFF_DEBUG will syslog the option negotiation and state
78 * transitions at level kern.debug. Note: all logs consistently look
79 * like
80 *
81 * <if-name><unit>: <proto-name> <additional info...>
82 *
83 * with <if-name><unit> being something like "bppp0", and <proto-name>
84 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
85 */
86
87 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
88 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
89 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */
90
91 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
92 #define PPP_UI 0x03 /* Unnumbered Information */
93 #define PPP_IP 0x0021 /* Internet Protocol */
94 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
95 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
96 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */
97 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */
98 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */
99 #define PPP_LCP 0xc021 /* Link Control Protocol */
100 #define PPP_PAP 0xc023 /* Password Authentication Protocol */
101 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
102 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
103 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
104
105 #define CONF_REQ 1 /* PPP configure request */
106 #define CONF_ACK 2 /* PPP configure acknowledge */
107 #define CONF_NAK 3 /* PPP configure negative ack */
108 #define CONF_REJ 4 /* PPP configure reject */
109 #define TERM_REQ 5 /* PPP terminate request */
110 #define TERM_ACK 6 /* PPP terminate acknowledge */
111 #define CODE_REJ 7 /* PPP code reject */
112 #define PROTO_REJ 8 /* PPP protocol reject */
113 #define ECHO_REQ 9 /* PPP echo request */
114 #define ECHO_REPLY 10 /* PPP echo reply */
115 #define DISC_REQ 11 /* PPP discard request */
116
117 #define LCP_OPT_MRU 1 /* maximum receive unit */
118 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
119 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
120 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
121 #define LCP_OPT_MAGIC 5 /* magic number */
122 #define LCP_OPT_RESERVED 6 /* reserved */
123 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
124 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
125
126 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
127 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
128 #define IPCP_OPT_ADDRESS 3 /* local IP address */
129
130 #define IPV6CP_OPT_IFID 1 /* interface identifier */
131 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
132
133 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */
134
135 #define PAP_REQ 1 /* PAP name/password request */
136 #define PAP_ACK 2 /* PAP acknowledge */
137 #define PAP_NAK 3 /* PAP fail */
138
139 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
140 #define CHAP_RESPONSE 2 /* CHAP challenge response */
141 #define CHAP_SUCCESS 3 /* CHAP response ok */
142 #define CHAP_FAILURE 4 /* CHAP response failed */
143
144 #define CHAP_MD5 5 /* hash algorithm - MD5 */
145
146 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
147 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
148 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
149 #define CISCO_ADDR_REQ 0 /* Cisco address request */
150 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
151 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
152
153 /* states are named and numbered according to RFC 1661 */
154 #define STATE_INITIAL 0
155 #define STATE_STARTING 1
156 #define STATE_CLOSED 2
157 #define STATE_STOPPED 3
158 #define STATE_CLOSING 4
159 #define STATE_STOPPING 5
160 #define STATE_REQ_SENT 6
161 #define STATE_ACK_RCVD 7
162 #define STATE_ACK_SENT 8
163 #define STATE_OPENED 9
164
165 struct ppp_header {
166 u_char address;
167 u_char control;
168 u_short protocol;
169 } __attribute__((__packed__));
170 #define PPP_HEADER_LEN sizeof (struct ppp_header)
171
172 struct lcp_header {
173 u_char type;
174 u_char ident;
175 u_short len;
176 } __attribute__((__packed__));
177 #define LCP_HEADER_LEN sizeof (struct lcp_header)
178
179 struct cisco_packet {
180 u_long type;
181 u_long par1;
182 u_long par2;
183 u_short rel;
184 u_short time0;
185 u_short time1;
186 } __attribute__((__packed__));
187 #define CISCO_PACKET_LEN sizeof (struct cisco_packet)
188
189 /*
190 * We follow the spelling and capitalization of RFC 1661 here, to make
191 * it easier comparing with the standard. Please refer to this RFC in
192 * case you can't make sense out of these abbreviation; it will also
193 * explain the semantics related to the various events and actions.
194 */
195 struct cp {
196 u_short proto; /* PPP control protocol number */
197 u_char protoidx; /* index into state table in struct sppp */
198 u_char flags;
199 #define CP_LCP 0x01 /* this is the LCP */
200 #define CP_AUTH 0x02 /* this is an authentication protocol */
201 #define CP_NCP 0x04 /* this is a NCP */
202 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
203 const char *name; /* name of this control protocol */
204 /* event handlers */
205 void (*Up)(struct sppp *sp);
206 void (*Down)(struct sppp *sp);
207 void (*Open)(struct sppp *sp);
208 void (*Close)(struct sppp *sp);
209 void (*TO)(void *sp);
210 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
211 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
212 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
213 /* actions */
214 void (*tlu)(struct sppp *sp);
215 void (*tld)(struct sppp *sp);
216 void (*tls)(struct sppp *sp);
217 void (*tlf)(struct sppp *sp);
218 void (*scr)(struct sppp *sp);
219 };
220
221 static struct sppp *spppq;
222 static struct callout keepalive_timeout;
223
224 #define SPP_FMT "%s: "
225 #define SPP_ARGS(ifp) (ifp)->if_xname
226
227 #ifdef INET
228 /*
229 * The following disgusting hack gets around the problem that IP TOS
230 * can't be set yet. We want to put "interactive" traffic on a high
231 * priority queue. To decide if traffic is interactive, we check that
232 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
233 *
234 * XXX is this really still necessary? - joerg -
235 */
236 static u_short interactive_ports[8] = {
237 0, 513, 0, 0,
238 0, 21, 0, 23,
239 };
240 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
241 #endif
242
243 /* almost every function needs these */
244 #define STDDCL \
245 struct ifnet *ifp = &sp->pp_if; \
246 int debug = ifp->if_flags & IFF_DEBUG
247
248 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
249 struct sockaddr *dst, struct rtentry *rt);
250
251 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
252 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
253
254 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
255 struct mbuf *m);
256 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
257 u_char ident, u_short len, void *data);
258 /* static void sppp_cp_timeout(void *arg); */
259 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
260 int newstate);
261 static void sppp_auth_send(const struct cp *cp,
262 struct sppp *sp, unsigned int type, unsigned int id,
263 ...);
264
265 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
266 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
267 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
268 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
269 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
270
271 static void sppp_null(struct sppp *sp);
272
273 static void sppp_lcp_init(struct sppp *sp);
274 static void sppp_lcp_up(struct sppp *sp);
275 static void sppp_lcp_down(struct sppp *sp);
276 static void sppp_lcp_open(struct sppp *sp);
277 static void sppp_lcp_close(struct sppp *sp);
278 static void sppp_lcp_TO(void *sp);
279 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
280 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
281 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
282 static void sppp_lcp_tlu(struct sppp *sp);
283 static void sppp_lcp_tld(struct sppp *sp);
284 static void sppp_lcp_tls(struct sppp *sp);
285 static void sppp_lcp_tlf(struct sppp *sp);
286 static void sppp_lcp_scr(struct sppp *sp);
287 static void sppp_lcp_check_and_close(struct sppp *sp);
288 static int sppp_ncp_check(struct sppp *sp);
289
290 static void sppp_ipcp_init(struct sppp *sp);
291 static void sppp_ipcp_up(struct sppp *sp);
292 static void sppp_ipcp_down(struct sppp *sp);
293 static void sppp_ipcp_open(struct sppp *sp);
294 static void sppp_ipcp_close(struct sppp *sp);
295 static void sppp_ipcp_TO(void *sp);
296 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
297 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
298 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
299 static void sppp_ipcp_tlu(struct sppp *sp);
300 static void sppp_ipcp_tld(struct sppp *sp);
301 static void sppp_ipcp_tls(struct sppp *sp);
302 static void sppp_ipcp_tlf(struct sppp *sp);
303 static void sppp_ipcp_scr(struct sppp *sp);
304
305 static void sppp_ipv6cp_init(struct sppp *sp);
306 static void sppp_ipv6cp_up(struct sppp *sp);
307 static void sppp_ipv6cp_down(struct sppp *sp);
308 static void sppp_ipv6cp_open(struct sppp *sp);
309 static void sppp_ipv6cp_close(struct sppp *sp);
310 static void sppp_ipv6cp_TO(void *sp);
311 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
312 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
313 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
314 static void sppp_ipv6cp_tlu(struct sppp *sp);
315 static void sppp_ipv6cp_tld(struct sppp *sp);
316 static void sppp_ipv6cp_tls(struct sppp *sp);
317 static void sppp_ipv6cp_tlf(struct sppp *sp);
318 static void sppp_ipv6cp_scr(struct sppp *sp);
319
320 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
321 static void sppp_pap_init(struct sppp *sp);
322 static void sppp_pap_open(struct sppp *sp);
323 static void sppp_pap_close(struct sppp *sp);
324 static void sppp_pap_TO(void *sp);
325 static void sppp_pap_my_TO(void *sp);
326 static void sppp_pap_tlu(struct sppp *sp);
327 static void sppp_pap_tld(struct sppp *sp);
328 static void sppp_pap_scr(struct sppp *sp);
329
330 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
331 static void sppp_chap_init(struct sppp *sp);
332 static void sppp_chap_open(struct sppp *sp);
333 static void sppp_chap_close(struct sppp *sp);
334 static void sppp_chap_TO(void *sp);
335 static void sppp_chap_tlu(struct sppp *sp);
336 static void sppp_chap_tld(struct sppp *sp);
337 static void sppp_chap_scr(struct sppp *sp);
338
339 static const char *sppp_auth_type_name(u_short proto, u_char type);
340 static const char *sppp_cp_type_name(u_char type);
341 static const char *sppp_dotted_quad(u_long addr);
342 static const char *sppp_ipcp_opt_name(u_char opt);
343 #ifdef INET6
344 static const char *sppp_ipv6cp_opt_name(u_char opt);
345 #endif
346 static const char *sppp_lcp_opt_name(u_char opt);
347 static const char *sppp_phase_name(enum ppp_phase phase);
348 static const char *sppp_proto_name(u_short proto);
349 static const char *sppp_state_name(int state);
350 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
351 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
352 u_long *srcmask);
353 static void sppp_keepalive(void *dummy);
354 static void sppp_phase_network(struct sppp *sp);
355 static void sppp_print_bytes(const u_char *p, u_short len);
356 static void sppp_print_string(const char *p, u_short len);
357 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
358 #ifdef INET6
359 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
360 struct in6_addr *dst, struct in6_addr *srcmask);
361 #ifdef IPV6CP_MYIFID_DYN
362 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
363 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
364 #endif
365 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
366 #endif
367
368 /* our control protocol descriptors */
369 static const struct cp lcp = {
370 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
371 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
372 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
373 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
374 sppp_lcp_scr
375 };
376
377 static const struct cp ipcp = {
378 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
379 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
380 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
381 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
382 sppp_ipcp_scr
383 };
384
385 static const struct cp ipv6cp = {
386 PPP_IPV6CP, IDX_IPV6CP,
387 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
388 CP_NCP,
389 #else
390 0,
391 #endif
392 "ipv6cp",
393 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
394 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
395 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
396 sppp_ipv6cp_scr
397 };
398
399 static const struct cp pap = {
400 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
401 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
402 sppp_pap_TO, 0, 0, 0,
403 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
404 sppp_pap_scr
405 };
406
407 static const struct cp chap = {
408 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
409 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
410 sppp_chap_TO, 0, 0, 0,
411 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
412 sppp_chap_scr
413 };
414
415 static const struct cp *cps[IDX_COUNT] = {
416 &lcp, /* IDX_LCP */
417 &ipcp, /* IDX_IPCP */
418 &ipv6cp, /* IDX_IPV6CP */
419 &pap, /* IDX_PAP */
420 &chap, /* IDX_CHAP */
421 };
422
423 static int
424 sppp_modevent(module_t mod, int type, void *unused)
425 {
426 switch (type) {
427 case MOD_LOAD:
428 callout_init(&keepalive_timeout);
429 break;
430 case MOD_UNLOAD:
431 return EACCES;
432 break;
433 default:
434 break;
435 }
436 return 0;
437 }
438 static moduledata_t spppmod = {
439 "sppp",
440 sppp_modevent,
441 0
442 };
443 MODULE_VERSION(sppp, 1);
444 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
445
446 /*
447 * Exported functions, comprising our interface to the lower layer.
448 */
449
450 /*
451 * Process the received packet.
452 */
453 void
454 sppp_input(struct ifnet *ifp, struct mbuf *m)
455 {
456 struct ppp_header *h;
457 int isr = -1;
458 struct sppp *sp = (struct sppp *)ifp;
459 u_char *iphdr;
460 int hlen, vjlen, do_account = 0;
461 int debug = ifp->if_flags & IFF_DEBUG;
462
463 if (ifp->if_flags & IFF_UP)
464 /* Count received bytes, add FCS and one flag */
465 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len + 3);
466
467 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
468 /* Too small packet, drop it. */
469 if (debug)
470 log(LOG_DEBUG,
471 SPP_FMT "input packet is too small, %d bytes\n",
472 SPP_ARGS(ifp), m->m_pkthdr.len);
473 drop:
474 m_freem (m);
475 drop2:
476 IFNET_STAT_INC(ifp, ierrors, 1);
477 IFNET_STAT_INC(ifp, iqdrops, 1);
478 return;
479 }
480
481 /* Get PPP header. */
482 h = mtod (m, struct ppp_header*);
483 m_adj (m, PPP_HEADER_LEN);
484
485 switch (h->address) {
486 case PPP_ALLSTATIONS:
487 if (h->control != PPP_UI)
488 goto invalid;
489 if (sp->pp_mode == IFF_CISCO) {
490 if (debug)
491 log(LOG_DEBUG,
492 SPP_FMT "PPP packet in Cisco mode "
493 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
494 SPP_ARGS(ifp),
495 h->address, h->control, ntohs(h->protocol));
496 goto drop;
497 }
498 switch (ntohs (h->protocol)) {
499 default:
500 if (debug)
501 log(LOG_DEBUG,
502 SPP_FMT "rejecting protocol "
503 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
504 SPP_ARGS(ifp),
505 h->address, h->control, ntohs(h->protocol));
506 if (sp->state[IDX_LCP] == STATE_OPENED)
507 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
508 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
509 &h->protocol);
510 IFNET_STAT_INC(ifp, noproto, 1);
511 goto drop;
512 case PPP_LCP:
513 sppp_cp_input(&lcp, sp, m);
514 m_freem (m);
515 return;
516 case PPP_PAP:
517 if (sp->pp_phase >= PHASE_AUTHENTICATE)
518 sppp_pap_input(sp, m);
519 m_freem (m);
520 return;
521 case PPP_CHAP:
522 if (sp->pp_phase >= PHASE_AUTHENTICATE)
523 sppp_chap_input(sp, m);
524 m_freem (m);
525 return;
526 #ifdef INET
527 case PPP_IPCP:
528 if (sp->pp_phase == PHASE_NETWORK)
529 sppp_cp_input(&ipcp, sp, m);
530 m_freem (m);
531 return;
532 case PPP_IP:
533 if (sp->state[IDX_IPCP] == STATE_OPENED) {
534 isr = NETISR_IP;
535 }
536 do_account++;
537 break;
538 case PPP_VJ_COMP:
539 if (sp->state[IDX_IPCP] == STATE_OPENED) {
540 if ((vjlen =
541 sl_uncompress_tcp_core(mtod(m, u_char *),
542 m->m_len, m->m_len,
543 TYPE_COMPRESSED_TCP,
544 sp->pp_comp,
545 &iphdr, &hlen)) <= 0) {
546 if (debug)
547 log(LOG_INFO,
548 SPP_FMT "VJ uncompress failed on compressed packet\n",
549 SPP_ARGS(ifp));
550 goto drop;
551 }
552
553 /*
554 * Trim the VJ header off the packet, and prepend
555 * the uncompressed IP header (which will usually
556 * end up in two chained mbufs since there's not
557 * enough leading space in the existing mbuf).
558 */
559 m_adj(m, vjlen);
560 M_PREPEND(m, hlen, M_NOWAIT);
561 if (m == NULL)
562 goto drop2;
563 bcopy(iphdr, mtod(m, u_char *), hlen);
564
565 isr = NETISR_IP;
566 }
567 do_account++;
568 break;
569 case PPP_VJ_UCOMP:
570 if (sp->state[IDX_IPCP] == STATE_OPENED) {
571 if (sl_uncompress_tcp_core(mtod(m, u_char *),
572 m->m_len, m->m_len,
573 TYPE_UNCOMPRESSED_TCP,
574 sp->pp_comp,
575 &iphdr, &hlen) != 0) {
576 if (debug)
577 log(LOG_INFO,
578 SPP_FMT "VJ uncompress failed on uncompressed packet\n",
579 SPP_ARGS(ifp));
580 goto drop;
581 }
582 isr = NETISR_IP;
583 }
584 do_account++;
585 break;
586 #endif
587 #ifdef INET6
588 case PPP_IPV6CP:
589 if (sp->pp_phase == PHASE_NETWORK)
590 sppp_cp_input(&ipv6cp, sp, m);
591 m_freem (m);
592 return;
593
594 case PPP_IPV6:
595 if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
596 isr = NETISR_IPV6;
597 }
598 do_account++;
599 break;
600 #endif
601 }
602 break;
603 case CISCO_MULTICAST:
604 case CISCO_UNICAST:
605 /* Don't check the control field here (RFC 1547). */
606 if (sp->pp_mode != IFF_CISCO) {
607 if (debug)
608 log(LOG_DEBUG,
609 SPP_FMT "Cisco packet in PPP mode "
610 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
611 SPP_ARGS(ifp),
612 h->address, h->control, ntohs(h->protocol));
613 goto drop;
614 }
615 switch (ntohs (h->protocol)) {
616 default:
617 IFNET_STAT_INC(ifp, noproto, 1);
618 goto invalid;
619 case CISCO_KEEPALIVE:
620 sppp_cisco_input ((struct sppp*) ifp, m);
621 m_freem (m);
622 return;
623 #ifdef INET
624 case ETHERTYPE_IP:
625 isr = NETISR_IP;
626 do_account++;
627 break;
628 #endif
629 #ifdef INET6
630 case ETHERTYPE_IPV6:
631 isr = NETISR_IPV6;
632 do_account++;
633 break;
634 #endif
635 }
636 break;
637 default: /* Invalid PPP packet. */
638 invalid:
639 if (debug)
640 log(LOG_DEBUG,
641 SPP_FMT "invalid input packet "
642 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
643 SPP_ARGS(ifp),
644 h->address, h->control, ntohs(h->protocol));
645 goto drop;
646 }
647
648 if (! (ifp->if_flags & IFF_UP) || isr < 0)
649 goto drop;
650
651 /* Check queue. */
652
653 netisr_queue(isr, m);
654
655 /*
656 * Do only account for network packets, not for control
657 * packets. This is used by some subsystems to detect
658 * idle lines.
659 */
660 if (do_account)
661 sp->pp_last_recv = time_uptime;
662 }
663
664 /*
665 * Enqueue transmit packet.
666 */
667 static int
668 sppp_output_serialized(struct ifnet *ifp, struct ifaltq_subque *ifsq,
669 struct mbuf *m, struct sockaddr *dst, struct rtentry *rt)
670 {
671 struct sppp *sp = (struct sppp*) ifp;
672 struct ppp_header *h;
673 struct ifqueue *ifq = NULL;
674 int rv = 0;
675 int ipproto = PPP_IP;
676 int debug = ifp->if_flags & IFF_DEBUG;
677 struct altq_pktattr pktattr;
678
679 crit_enter();
680
681 if ((ifp->if_flags & IFF_UP) == 0 ||
682 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
683 #ifdef INET6
684 drop:
685 #endif
686 m_freem (m);
687 crit_exit();
688 return (ENETDOWN);
689 }
690
691 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
692 #ifdef INET6
693 /*
694 * XXX
695 *
696 * Hack to prevent the initialization-time generated
697 * IPv6 multicast packet to erroneously cause a
698 * dialout event in case IPv6 has been
699 * administratively disabled on that interface.
700 */
701 if (dst->sa_family == AF_INET6 &&
702 !(sp->confflags & CONF_ENABLE_IPV6))
703 goto drop;
704 #endif
705 /*
706 * Interface is not yet running, but auto-dial. Need
707 * to start LCP for it.
708 */
709 ifp->if_flags |= IFF_RUNNING;
710 crit_exit();
711 lcp.Open(sp);
712 crit_enter();
713 }
714
715 /*
716 * if the queueing discipline needs packet classification,
717 * do it before prepending link headers.
718 */
719 ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
720
721 #ifdef INET
722 if (dst->sa_family == AF_INET) {
723 /* XXX Check mbuf length here? */
724 struct ip *ip = mtod (m, struct ip*);
725 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
726
727 /*
728 * When using dynamic local IP address assignment by using
729 * 0.0.0.0 as a local address, the first TCP session will
730 * not connect because the local TCP checksum is computed
731 * using 0.0.0.0 which will later become our real IP address
732 * so the TCP checksum computed at the remote end will
733 * become invalid. So we
734 * - don't let packets with src ip addr 0 thru
735 * - we flag TCP packets with src ip 0 as an error
736 */
737
738 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
739 {
740 m_freem(m);
741 crit_exit();
742 if(ip->ip_p == IPPROTO_TCP)
743 return(EADDRNOTAVAIL);
744 else
745 return(0);
746 }
747
748 /*
749 * Put low delay, telnet, rlogin and ftp control packets
750 * in front of the queue.
751 */
752 if (IF_QFULL (&sp->pp_fastq))
753 ;
754 else if (ip->ip_tos & IPTOS_LOWDELAY)
755 ifq = &sp->pp_fastq;
756 else if (m->m_len < sizeof *ip + sizeof *tcp)
757 ;
758 else if (ip->ip_p != IPPROTO_TCP)
759 ;
760 else if (INTERACTIVE (ntohs (tcp->th_sport)))
761 ifq = &sp->pp_fastq;
762 else if (INTERACTIVE (ntohs (tcp->th_dport)))
763 ifq = &sp->pp_fastq;
764
765 /*
766 * Do IP Header compression
767 */
768 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
769 ip->ip_p == IPPROTO_TCP)
770 switch (sl_compress_tcp(m, ip, sp->pp_comp,
771 sp->ipcp.compress_cid)) {
772 case TYPE_COMPRESSED_TCP:
773 ipproto = PPP_VJ_COMP;
774 break;
775 case TYPE_UNCOMPRESSED_TCP:
776 ipproto = PPP_VJ_UCOMP;
777 break;
778 case TYPE_IP:
779 ipproto = PPP_IP;
780 break;
781 default:
782 m_freem(m);
783 crit_exit();
784 return (EINVAL);
785 }
786 }
787 #endif
788
789 #ifdef INET6
790 if (dst->sa_family == AF_INET6) {
791 /* XXX do something tricky here? */
792 }
793 #endif
794
795 /*
796 * Prepend general data packet PPP header. For now, IP only.
797 */
798 M_PREPEND (m, PPP_HEADER_LEN, M_NOWAIT);
799 if (! m) {
800 if (debug)
801 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
802 SPP_ARGS(ifp));
803 IFNET_STAT_INC(ifp, oerrors, 1);
804 crit_exit();
805 return (ENOBUFS);
806 }
807 /*
808 * May want to check size of packet
809 * (albeit due to the implementation it's always enough)
810 */
811 h = mtod (m, struct ppp_header*);
812 if (sp->pp_mode == IFF_CISCO) {
813 h->address = CISCO_UNICAST; /* unicast address */
814 h->control = 0;
815 } else {
816 h->address = PPP_ALLSTATIONS; /* broadcast address */
817 h->control = PPP_UI; /* Unnumbered Info */
818 }
819
820 switch (dst->sa_family) {
821 #ifdef INET
822 case AF_INET: /* Internet Protocol */
823 if (sp->pp_mode == IFF_CISCO)
824 h->protocol = htons (ETHERTYPE_IP);
825 else {
826 /*
827 * Don't choke with an ENETDOWN early. It's
828 * possible that we just started dialing out,
829 * so don't drop the packet immediately. If
830 * we notice that we run out of buffer space
831 * below, we will however remember that we are
832 * not ready to carry IP packets, and return
833 * ENETDOWN, as opposed to ENOBUFS.
834 */
835 h->protocol = htons(ipproto);
836 if (sp->state[IDX_IPCP] != STATE_OPENED)
837 rv = ENETDOWN;
838 }
839 break;
840 #endif
841 #ifdef INET6
842 case AF_INET6: /* Internet Protocol */
843 if (sp->pp_mode == IFF_CISCO)
844 h->protocol = htons (ETHERTYPE_IPV6);
845 else {
846 /*
847 * Don't choke with an ENETDOWN early. It's
848 * possible that we just started dialing out,
849 * so don't drop the packet immediately. If
850 * we notice that we run out of buffer space
851 * below, we will however remember that we are
852 * not ready to carry IP packets, and return
853 * ENETDOWN, as opposed to ENOBUFS.
854 */
855 h->protocol = htons(PPP_IPV6);
856 if (sp->state[IDX_IPV6CP] != STATE_OPENED)
857 rv = ENETDOWN;
858 }
859 break;
860 #endif
861 default:
862 m_freem (m);
863 IFNET_STAT_INC(ifp, oerrors, 1);
864 crit_exit();
865 return (EAFNOSUPPORT);
866 }
867
868 /*
869 * Queue message on interface, and start output if interface
870 * not yet active.
871 */
872 if (ifq != NULL) {
873 if (IF_QFULL(ifq)) {
874 IF_DROP(ifq);
875 m_freem(m);
876 rv = ENOBUFS;
877 } else {
878 IF_ENQUEUE(ifq, m);
879 rv = 0;
880 }
881 } else {
882 rv = ifsq_enqueue(ifsq, m, &pktattr);
883 }
884 if (rv) {
885 IFNET_STAT_INC(ifp, oerrors, 1);
886 crit_exit();
887 return(rv);
888 }
889 if (!ifsq_is_oactive(ifsq))
890 (*ifp->if_start) (ifp, ifsq);
891
892 /*
893 * Count output packets and bytes.
894 * The packet length includes header, FCS and 1 flag,
895 * according to RFC 1333.
896 */
897 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + 3);
898
899 /*
900 * Unlike in sppp_input(), we can always bump the timestamp
901 * here since sppp_output() is only called on behalf of
902 * network-layer traffic; control-layer traffic is handled
903 * by sppp_cp_send().
904 */
905 sp->pp_last_sent = time_uptime;
906
907 crit_exit();
908 return (0);
909 }
910
911 static int
912 sppp_output(struct ifnet *ifp, struct mbuf *m,
913 struct sockaddr *dst, struct rtentry *rt)
914 {
915 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
916 int error;
917
918 ifsq_serialize_hw(ifsq);
919 error = sppp_output_serialized(ifp, ifsq, m, dst, rt);
920 ifsq_deserialize_hw(ifsq);
921
922 return error;
923 }
924
925 void
926 sppp_attach(struct ifnet *ifp)
927 {
928 struct sppp *sp = (struct sppp*) ifp;
929
930 /* Initialize keepalive handler. */
931 if (!spppq) {
932 callout_reset(&keepalive_timeout, hz * 10,
933 sppp_keepalive, NULL);
934 }
935 /* Insert new entry into the keepalive list. */
936 sp->pp_next = spppq;
937 spppq = sp;
938
939 sp->pp_if.if_mtu = PP_MTU;
940 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
941 sp->pp_if.if_type = IFT_PPP;
942 sp->pp_if.if_output = sppp_output;
943 #if 0
944 sp->pp_flags = PP_KEEPALIVE;
945 #endif
946 ifq_set_maxlen(&sp->pp_if.if_snd, 32);
947 sp->pp_fastq.ifq_maxlen = 32;
948 sp->pp_cpq.ifq_maxlen = 20;
949 sp->pp_loopcnt = 0;
950 sp->pp_alivecnt = 0;
951 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
952 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
953 sp->pp_phase = PHASE_DEAD;
954 sp->pp_up = lcp.Up;
955 sp->pp_down = lcp.Down;
956 sp->pp_last_recv = sp->pp_last_sent = time_uptime;
957 sp->confflags = 0;
958 #ifdef INET
959 sp->confflags |= CONF_ENABLE_VJ;
960 #endif
961 #ifdef INET6
962 sp->confflags |= CONF_ENABLE_IPV6;
963 #endif
964 sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
965 sl_compress_init(sp->pp_comp, -1);
966 sppp_lcp_init(sp);
967 sppp_ipcp_init(sp);
968 sppp_ipv6cp_init(sp);
969 sppp_pap_init(sp);
970 sppp_chap_init(sp);
971 }
972
973 void
974 sppp_detach(struct ifnet *ifp)
975 {
976 struct sppp **q, *p, *sp = (struct sppp*) ifp;
977 int i;
978
979 /* Remove the entry from the keepalive list. */
980 for (q = &spppq; (p = *q); q = &p->pp_next)
981 if (p == sp) {
982 *q = p->pp_next;
983 break;
984 }
985
986 /* Stop keepalive handler. */
987 if (!spppq)
988 callout_stop(&keepalive_timeout);
989
990 for (i = 0; i < IDX_COUNT; i++)
991 callout_stop(&sp->timeout[i]);
992 callout_stop(&sp->pap_my_to);
993 }
994
995 /*
996 * Flush the interface output queue.
997 */
998 void
999 sppp_flush(struct ifnet *ifp)
1000 {
1001 struct sppp *sp = (struct sppp*) ifp;
1002
1003 ifq_purge_all(&sp->pp_if.if_snd);
1004 IF_DRAIN(&sp->pp_fastq);
1005 IF_DRAIN(&sp->pp_cpq);
1006 }
1007
1008 /*
1009 * Check if the output queue is empty.
1010 */
1011 int
1012 sppp_isempty(struct ifnet *ifp)
1013 {
1014 struct sppp *sp = (struct sppp*) ifp;
1015 int empty;
1016
1017 crit_enter();
1018 empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1019 ifsq_is_empty(ifq_get_subq_default(&sp->pp_if.if_snd));
1020 crit_exit();
1021 return (empty);
1022 }
1023
1024 /*
1025 * Get next packet to send.
1026 */
1027 struct mbuf *
1028 sppp_dequeue(struct ifnet *ifp)
1029 {
1030 struct sppp *sp = (struct sppp*) ifp;
1031 struct mbuf *m;
1032
1033 crit_enter();
1034
1035 /*
1036 * Process only the control protocol queue until we have at
1037 * least one NCP open.
1038 *
1039 * Do always serve all three queues in Cisco mode.
1040 */
1041 IF_DEQUEUE(&sp->pp_cpq, m);
1042 if (m == NULL &&
1043 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1044 IF_DEQUEUE(&sp->pp_fastq, m);
1045 if (m == NULL) {
1046 m = ifsq_dequeue(
1047 ifq_get_subq_default(&sp->pp_if.if_snd));
1048 }
1049 }
1050
1051 crit_exit();
1052 return m;
1053 }
1054
1055 /*
1056 * Pick the next packet, do not remove it from the queue.
1057 */
1058 struct mbuf *
1059 sppp_pick(struct ifnet *ifp)
1060 {
1061 struct sppp *sp = (struct sppp*)ifp;
1062 struct mbuf *m;
1063
1064 crit_enter();
1065
1066 m = sp->pp_cpq.ifq_head;
1067 if (m == NULL &&
1068 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1069 if ((m = sp->pp_fastq.ifq_head) == NULL)
1070 m = ifsq_poll(ifq_get_subq_default(&sp->pp_if.if_snd));
1071 }
1072
1073 crit_exit();
1074 return (m);
1075 }
1076
1077 /*
1078 * Process an ioctl request. Called on low priority level.
1079 */
1080 int
1081 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1082 {
1083 struct ifreq *ifr = (struct ifreq*) data;
1084 struct sppp *sp = (struct sppp*) ifp;
1085 int rv, going_up, going_down, newmode;
1086
1087 crit_enter();
1088
1089 rv = 0;
1090 switch (cmd) {
1091 case SIOCAIFADDR:
1092 case SIOCSIFDSTADDR:
1093 break;
1094
1095 case SIOCSIFADDR:
1096 /* set the interface "up" when assigning an IP address */
1097 ifp->if_flags |= IFF_UP;
1098 /* fall through... */
1099
1100 case SIOCSIFFLAGS:
1101 going_up = ifp->if_flags & IFF_UP &&
1102 (ifp->if_flags & IFF_RUNNING) == 0;
1103 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1104 ifp->if_flags & IFF_RUNNING;
1105
1106 newmode = ifp->if_flags & IFF_PASSIVE;
1107 if (!newmode)
1108 newmode = ifp->if_flags & IFF_AUTO;
1109 if (!newmode)
1110 newmode = ifp->if_flags & IFF_CISCO;
1111 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1112 ifp->if_flags |= newmode;
1113
1114 if (newmode != sp->pp_mode) {
1115 going_down = 1;
1116 if (!going_up)
1117 going_up = ifp->if_flags & IFF_RUNNING;
1118 }
1119
1120 if (going_down) {
1121 if (sp->pp_mode != IFF_CISCO)
1122 lcp.Close(sp);
1123 else if (sp->pp_tlf)
1124 (sp->pp_tlf)(sp);
1125 sppp_flush(ifp);
1126 ifp->if_flags &= ~IFF_RUNNING;
1127 sp->pp_mode = newmode;
1128 }
1129
1130 if (going_up) {
1131 if (sp->pp_mode != IFF_CISCO)
1132 lcp.Close(sp);
1133 sp->pp_mode = newmode;
1134 if (sp->pp_mode == 0) {
1135 ifp->if_flags |= IFF_RUNNING;
1136 lcp.Open(sp);
1137 }
1138 if (sp->pp_mode == IFF_CISCO) {
1139 if (sp->pp_tls)
1140 (sp->pp_tls)(sp);
1141 ifp->if_flags |= IFF_RUNNING;
1142 }
1143 }
1144
1145 break;
1146
1147 #ifdef SIOCSIFMTU
1148 #ifndef ifr_mtu
1149 #define ifr_mtu ifr_metric
1150 #endif
1151 case SIOCSIFMTU:
1152 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) {
1153 crit_exit();
1154 return (EINVAL);
1155 }
1156 ifp->if_mtu = ifr->ifr_mtu;
1157 break;
1158 #endif
1159 #ifdef SLIOCSETMTU
1160 case SLIOCSETMTU:
1161 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) {
1162 crit_exit();
1163 return (EINVAL);
1164 }
1165 ifp->if_mtu = *(short*)data;
1166 break;
1167 #endif
1168 #ifdef SIOCGIFMTU
1169 case SIOCGIFMTU:
1170 ifr->ifr_mtu = ifp->if_mtu;
1171 break;
1172 #endif
1173 #ifdef SLIOCGETMTU
1174 case SLIOCGETMTU:
1175 *(short*)data = ifp->if_mtu;
1176 break;
1177 #endif
1178 case SIOCADDMULTI:
1179 case SIOCDELMULTI:
1180 break;
1181
1182 case SIOCGIFGENERIC:
1183 case SIOCSIFGENERIC:
1184 rv = sppp_params(sp, cmd, data);
1185 break;
1186
1187 default:
1188 rv = ENOTTY;
1189 }
1190
1191 crit_exit();
1192 return rv;
1193 }
1194
1195 /*
1196 * Cisco framing implementation.
1197 */
1198
1199 /*
1200 * Handle incoming Cisco keepalive protocol packets.
1201 */
1202 static void
1203 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1204 {
1205 STDDCL;
1206 struct cisco_packet *h;
1207 u_long me, mymask;
1208
1209 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1210 if (debug)
1211 log(LOG_DEBUG,
1212 SPP_FMT "cisco invalid packet length: %d bytes\n",
1213 SPP_ARGS(ifp), m->m_pkthdr.len);
1214 return;
1215 }
1216 h = mtod (m, struct cisco_packet*);
1217 if (debug)
1218 log(LOG_DEBUG,
1219 SPP_FMT "cisco input: %d bytes "
1220 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1221 SPP_ARGS(ifp), m->m_pkthdr.len,
1222 (u_long)ntohl (h->type), h->par1, h->par2, (u_int)h->rel,
1223 (u_int)h->time0, (u_int)h->time1);
1224 switch (ntohl (h->type)) {
1225 default:
1226 if (debug)
1227 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1228 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1229 break;
1230 case CISCO_ADDR_REPLY:
1231 /* Reply on address request, ignore */
1232 break;
1233 case CISCO_KEEPALIVE_REQ:
1234 sp->pp_alivecnt = 0;
1235 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1236 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1237 /* Local and remote sequence numbers are equal.
1238 * Probably, the line is in loopback mode. */
1239 if (sp->pp_loopcnt >= MAXALIVECNT) {
1240 kprintf (SPP_FMT "loopback\n",
1241 SPP_ARGS(ifp));
1242 sp->pp_loopcnt = 0;
1243 if (ifp->if_flags & IFF_UP) {
1244 if_down (ifp);
1245 IF_DRAIN(&sp->pp_cpq);
1246 }
1247 }
1248 ++sp->pp_loopcnt;
1249
1250 /* Generate new local sequence number */
1251 sp->pp_seq[IDX_LCP] = krandom();
1252 break;
1253 }
1254 sp->pp_loopcnt = 0;
1255 if (! (ifp->if_flags & IFF_UP) &&
1256 (ifp->if_flags & IFF_RUNNING)) {
1257 if_up(ifp);
1258 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
1259 }
1260 break;
1261 case CISCO_ADDR_REQ:
1262 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1263 if (me != 0L)
1264 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1265 break;
1266 }
1267 }
1268
1269 /*
1270 * Send Cisco keepalive packet.
1271 */
1272 static void
1273 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1274 {
1275 STDDCL;
1276 struct ppp_header *h;
1277 struct cisco_packet *ch;
1278 struct mbuf *m;
1279 struct timeval tv;
1280 struct ifaltq_subque *ifsq;
1281
1282 getmicrouptime(&tv);
1283
1284 MGETHDR (m, M_NOWAIT, MT_DATA);
1285 if (! m)
1286 return;
1287 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1288 m->m_pkthdr.rcvif = 0;
1289
1290 h = mtod (m, struct ppp_header*);
1291 h->address = CISCO_MULTICAST;
1292 h->control = 0;
1293 h->protocol = htons (CISCO_KEEPALIVE);
1294
1295 ch = (struct cisco_packet*) (h + 1);
1296 ch->type = htonl (type);
1297 ch->par1 = htonl (par1);
1298 ch->par2 = htonl (par2);
1299 ch->rel = -1;
1300
1301 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1302 ch->time1 = htons ((u_short) tv.tv_sec);
1303
1304 if (debug)
1305 log(LOG_DEBUG,
1306 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1307 SPP_ARGS(ifp), (u_long)ntohl (ch->type), ch->par1,
1308 ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1309
1310 if (IF_QFULL (&sp->pp_cpq)) {
1311 IF_DROP (&sp->pp_fastq);
1312 m_freem (m);
1313 } else
1314 IF_ENQUEUE (&sp->pp_cpq, m);
1315 ifsq = ifq_get_subq_default(&ifp->if_snd);
1316 if (!ifsq_is_oactive(ifsq))
1317 (*ifp->if_start) (ifp, ifsq);
1318 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + 3);
1319 }
1320
1321 /*
1322 * PPP protocol implementation.
1323 */
1324
1325 /*
1326 * Send PPP control protocol packet.
1327 */
1328 static void
1329 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1330 u_char ident, u_short len, void *data)
1331 {
1332 STDDCL;
1333 struct ppp_header *h;
1334 struct lcp_header *lh;
1335 struct mbuf *m;
1336 struct ifaltq_subque *ifsq;
1337
1338 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1339 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1340 MGETHDR (m, M_NOWAIT, MT_DATA);
1341 if (! m)
1342 return;
1343 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1344 m->m_pkthdr.rcvif = 0;
1345
1346 h = mtod (m, struct ppp_header*);
1347 h->address = PPP_ALLSTATIONS; /* broadcast address */
1348 h->control = PPP_UI; /* Unnumbered Info */
1349 h->protocol = htons (proto); /* Link Control Protocol */
1350
1351 lh = (struct lcp_header*) (h + 1);
1352 lh->type = type;
1353 lh->ident = ident;
1354 lh->len = htons (LCP_HEADER_LEN + len);
1355 if (len)
1356 bcopy (data, lh+1, len);
1357
1358 if (debug) {
1359 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1360 SPP_ARGS(ifp),
1361 sppp_proto_name(proto),
1362 sppp_cp_type_name (lh->type), lh->ident,
1363 ntohs (lh->len));
1364 sppp_print_bytes ((u_char*) (lh+1), len);
1365 log(-1, ">\n");
1366 }
1367 if (IF_QFULL (&sp->pp_cpq)) {
1368 IF_DROP (&sp->pp_fastq);
1369 m_freem (m);
1370 IFNET_STAT_INC(ifp, oerrors, 1);
1371 } else
1372 IF_ENQUEUE (&sp->pp_cpq, m);
1373 ifsq = ifq_get_subq_default(&ifp->if_snd);
1374 if (!ifsq_is_oactive(ifsq))
1375 (*ifp->if_start) (ifp, ifsq);
1376 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + 3);
1377 }
1378
1379 /*
1380 * Handle incoming PPP control protocol packets.
1381 */
1382 static void
1383 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1384 {
1385 STDDCL;
1386 struct lcp_header *h;
1387 int printlen, len = m->m_pkthdr.len;
1388 int rv;
1389 u_char *p;
1390
1391 if (len < 4) {
1392 if (debug)
1393 log(LOG_DEBUG,
1394 SPP_FMT "%s invalid packet length: %d bytes\n",
1395 SPP_ARGS(ifp), cp->name, len);
1396 return;
1397 }
1398 h = mtod (m, struct lcp_header*);
1399 if (debug) {
1400 printlen = ntohs(h->len);
1401 log(LOG_DEBUG,
1402 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1403 SPP_ARGS(ifp), cp->name,
1404 sppp_state_name(sp->state[cp->protoidx]),
1405 sppp_cp_type_name (h->type), h->ident, printlen);
1406 if (len < printlen)
1407 printlen = len;
1408 if (printlen > 4)
1409 sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1410 log(-1, ">\n");
1411 }
1412 if (len > ntohs (h->len))
1413 len = ntohs (h->len);
1414 p = (u_char *)(h + 1);
1415 switch (h->type) {
1416 case CONF_REQ:
1417 if (len < 4) {
1418 if (debug)
1419 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1420 SPP_ARGS(ifp), cp->name,
1421 len);
1422 IFNET_STAT_INC(ifp, ierrors, 1);
1423 break;
1424 }
1425 /* handle states where RCR doesn't get a SCA/SCN */
1426 switch (sp->state[cp->protoidx]) {
1427 case STATE_CLOSING:
1428 case STATE_STOPPING:
1429 return;
1430 case STATE_CLOSED:
1431 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1432 0, 0);
1433 return;
1434 }
1435 rv = (cp->RCR)(sp, h, len);
1436 if (rv < 0) {
1437 /* fatal error, shut down */
1438 (cp->tld)(sp);
1439 sppp_lcp_tlf(sp);
1440 return;
1441 }
1442 switch (sp->state[cp->protoidx]) {
1443 case STATE_OPENED:
1444 (cp->tld)(sp);
1445 (cp->scr)(sp);
1446 /* fall through... */
1447 case STATE_ACK_SENT:
1448 case STATE_REQ_SENT:
1449 /*
1450 * sppp_cp_change_state() have the side effect of
1451 * restarting the timeouts. We want to avoid that
1452 * if the state don't change, otherwise we won't
1453 * ever timeout and resend a configuration request
1454 * that got lost.
1455 */
1456 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1457 STATE_REQ_SENT))
1458 break;
1459 sppp_cp_change_state(cp, sp, rv?
1460 STATE_ACK_SENT: STATE_REQ_SENT);
1461 break;
1462 case STATE_STOPPED:
1463 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1464 (cp->scr)(sp);
1465 sppp_cp_change_state(cp, sp, rv?
1466 STATE_ACK_SENT: STATE_REQ_SENT);
1467 break;
1468 case STATE_ACK_RCVD:
1469 if (rv) {
1470 sppp_cp_change_state(cp, sp, STATE_OPENED);
1471 if (debug)
1472 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1473 SPP_ARGS(ifp),
1474 cp->name);
1475 (cp->tlu)(sp);
1476 } else
1477 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1478 break;
1479 default:
1480 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1481 SPP_ARGS(ifp), cp->name,
1482 sppp_cp_type_name(h->type),
1483 sppp_state_name(sp->state[cp->protoidx]));
1484 IFNET_STAT_INC(ifp, ierrors, 1);
1485 }
1486 break;
1487 case CONF_ACK:
1488 if (h->ident != sp->confid[cp->protoidx]) {
1489 if (debug)
1490 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1491 SPP_ARGS(ifp), cp->name,
1492 h->ident, sp->confid[cp->protoidx]);
1493 IFNET_STAT_INC(ifp, ierrors, 1);
1494 break;
1495 }
1496 switch (sp->state[cp->protoidx]) {
1497 case STATE_CLOSED:
1498 case STATE_STOPPED:
1499 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1500 break;
1501 case STATE_CLOSING:
1502 case STATE_STOPPING:
1503 break;
1504 case STATE_REQ_SENT:
1505 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1506 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1507 break;
1508 case STATE_OPENED:
1509 (cp->tld)(sp);
1510 /* fall through */
1511 case STATE_ACK_RCVD:
1512 (cp->scr)(sp);
1513 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1514 break;
1515 case STATE_ACK_SENT:
1516 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1517 sppp_cp_change_state(cp, sp, STATE_OPENED);
1518 if (debug)
1519 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1520 SPP_ARGS(ifp), cp->name);
1521 (cp->tlu)(sp);
1522 break;
1523 default:
1524 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1525 SPP_ARGS(ifp), cp->name,
1526 sppp_cp_type_name(h->type),
1527 sppp_state_name(sp->state[cp->protoidx]));
1528 IFNET_STAT_INC(ifp, ierrors, 1);
1529 }
1530 break;
1531 case CONF_NAK:
1532 case CONF_REJ:
1533 if (h->ident != sp->confid[cp->protoidx]) {
1534 if (debug)
1535 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1536 SPP_ARGS(ifp), cp->name,
1537 h->ident, sp->confid[cp->protoidx]);
1538 IFNET_STAT_INC(ifp, ierrors, 1);
1539 break;
1540 }
1541 if (h->type == CONF_NAK)
1542 (cp->RCN_nak)(sp, h, len);
1543 else /* CONF_REJ */
1544 (cp->RCN_rej)(sp, h, len);
1545
1546 switch (sp->state[cp->protoidx]) {
1547 case STATE_CLOSED:
1548 case STATE_STOPPED:
1549 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1550 break;
1551 case STATE_REQ_SENT:
1552 case STATE_ACK_SENT:
1553 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1554 /*
1555 * Slow things down a bit if we think we might be
1556 * in loopback. Depend on the timeout to send the
1557 * next configuration request.
1558 */
1559 if (sp->pp_loopcnt)
1560 break;
1561 (cp->scr)(sp);
1562 break;
1563 case STATE_OPENED:
1564 (cp->tld)(sp);
1565 /* fall through */
1566 case STATE_ACK_RCVD:
1567 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1568 (cp->scr)(sp);
1569 break;
1570 case STATE_CLOSING:
1571 case STATE_STOPPING:
1572 break;
1573 default:
1574 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1575 SPP_ARGS(ifp), cp->name,
1576 sppp_cp_type_name(h->type),
1577 sppp_state_name(sp->state[cp->protoidx]));
1578 IFNET_STAT_INC(ifp, ierrors, 1);
1579 }
1580 break;
1581
1582 case TERM_REQ:
1583 switch (sp->state[cp->protoidx]) {
1584 case STATE_ACK_RCVD:
1585 case STATE_ACK_SENT:
1586 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1587 /* fall through */
1588 case STATE_CLOSED:
1589 case STATE_STOPPED:
1590 case STATE_CLOSING:
1591 case STATE_STOPPING:
1592 case STATE_REQ_SENT:
1593 sta:
1594 /* Send Terminate-Ack packet. */
1595 if (debug)
1596 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1597 SPP_ARGS(ifp), cp->name);
1598 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1599 break;
1600 case STATE_OPENED:
1601 (cp->tld)(sp);
1602 sp->rst_counter[cp->protoidx] = 0;
1603 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1604 goto sta;
1605 break;
1606 default:
1607 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1608 SPP_ARGS(ifp), cp->name,
1609 sppp_cp_type_name(h->type),
1610 sppp_state_name(sp->state[cp->protoidx]));
1611 IFNET_STAT_INC(ifp, ierrors, 1);
1612 }
1613 break;
1614 case TERM_ACK:
1615 switch (sp->state[cp->protoidx]) {
1616 case STATE_CLOSED:
1617 case STATE_STOPPED:
1618 case STATE_REQ_SENT:
1619 case STATE_ACK_SENT:
1620 break;
1621 case STATE_CLOSING:
1622 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1623 (cp->tlf)(sp);
1624 break;
1625 case STATE_STOPPING:
1626 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1627 (cp->tlf)(sp);
1628 break;
1629 case STATE_ACK_RCVD:
1630 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1631 break;
1632 case STATE_OPENED:
1633 (cp->tld)(sp);
1634 (cp->scr)(sp);
1635 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1636 break;
1637 default:
1638 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1639 SPP_ARGS(ifp), cp->name,
1640 sppp_cp_type_name(h->type),
1641 sppp_state_name(sp->state[cp->protoidx]));
1642 IFNET_STAT_INC(ifp, ierrors, 1);
1643 }
1644 break;
1645 case CODE_REJ:
1646 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1647 log(LOG_INFO,
1648 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1649 "danger will robinson\n",
1650 SPP_ARGS(ifp), cp->name,
1651 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1652 switch (sp->state[cp->protoidx]) {
1653 case STATE_CLOSED:
1654 case STATE_STOPPED:
1655 case STATE_REQ_SENT:
1656 case STATE_ACK_SENT:
1657 case STATE_CLOSING:
1658 case STATE_STOPPING:
1659 case STATE_OPENED:
1660 break;
1661 case STATE_ACK_RCVD:
1662 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1663 break;
1664 default:
1665 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1666 SPP_ARGS(ifp), cp->name,
1667 sppp_cp_type_name(h->type),
1668 sppp_state_name(sp->state[cp->protoidx]));
1669 IFNET_STAT_INC(ifp, ierrors, 1);
1670 }
1671 break;
1672 case PROTO_REJ:
1673 {
1674 int catastrophic;
1675 const struct cp *upper;
1676 int i;
1677 u_int16_t proto;
1678
1679 catastrophic = 0;
1680 upper = NULL;
1681 proto = ntohs(*((u_int16_t *)p));
1682 for (i = 0; i < IDX_COUNT; i++) {
1683 if (cps[i]->proto == proto) {
1684 upper = cps[i];
1685 break;
1686 }
1687 }
1688 if (upper == NULL)
1689 catastrophic++;
1690
1691 if (catastrophic || debug)
1692 log(catastrophic? LOG_INFO: LOG_DEBUG,
1693 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1694 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1695 sppp_cp_type_name(h->type), proto,
1696 upper ? upper->name : "unknown",
1697 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1698
1699 /*
1700 * if we got RXJ+ against conf-req, the peer does not implement
1701 * this particular protocol type. terminate the protocol.
1702 */
1703 if (upper && !catastrophic) {
1704 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1705 upper->Close(sp);
1706 break;
1707 }
1708 }
1709
1710 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1711 switch (sp->state[cp->protoidx]) {
1712 case STATE_CLOSED:
1713 case STATE_STOPPED:
1714 case STATE_REQ_SENT:
1715 case STATE_ACK_SENT:
1716 case STATE_CLOSING:
1717 case STATE_STOPPING:
1718 case STATE_OPENED:
1719 break;
1720 case STATE_ACK_RCVD:
1721 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1722 break;
1723 default:
1724 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1725 SPP_ARGS(ifp), cp->name,
1726 sppp_cp_type_name(h->type),
1727 sppp_state_name(sp->state[cp->protoidx]));
1728 IFNET_STAT_INC(ifp, ierrors, 1);
1729 }
1730 break;
1731 }
1732 case DISC_REQ:
1733 if (cp->proto != PPP_LCP)
1734 goto illegal;
1735 /* Discard the packet. */
1736 break;
1737 case ECHO_REQ:
1738 if (cp->proto != PPP_LCP)
1739 goto illegal;
1740 if (sp->state[cp->protoidx] != STATE_OPENED) {
1741 if (debug)
1742 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1743 SPP_ARGS(ifp));
1744 IFNET_STAT_INC(ifp, ierrors, 1);
1745 break;
1746 }
1747 if (len < 8) {
1748 if (debug)
1749 log(-1, SPP_FMT "invalid lcp echo request "
1750 "packet length: %d bytes\n",
1751 SPP_ARGS(ifp), len);
1752 break;
1753 }
1754 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1755 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1756 /* Line loopback mode detected. */
1757 kprintf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1758 sp->pp_loopcnt = MAXALIVECNT * 5;
1759 if_down (ifp);
1760 IF_DRAIN(&sp->pp_cpq);
1761
1762 /* Shut down the PPP link. */
1763 /* XXX */
1764 lcp.Down(sp);
1765 lcp.Up(sp);
1766 break;
1767 }
1768 *(long*)(h+1) = htonl (sp->lcp.magic);
1769 if (debug)
1770 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1771 SPP_ARGS(ifp));
1772 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1773 break;
1774 case ECHO_REPLY:
1775 if (cp->proto != PPP_LCP)
1776 goto illegal;
1777 if (h->ident != sp->lcp.echoid) {
1778 IFNET_STAT_INC(ifp, ierrors, 1);
1779 break;
1780 }
1781 if (len < 8) {
1782 if (debug)
1783 log(-1, SPP_FMT "lcp invalid echo reply "
1784 "packet length: %d bytes\n",
1785 SPP_ARGS(ifp), len);
1786 break;
1787 }
1788 if (debug)
1789 log(-1, SPP_FMT "lcp got echo rep\n",
1790 SPP_ARGS(ifp));
1791 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1792 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1793 sp->pp_alivecnt = 0;
1794 break;
1795 default:
1796 /* Unknown packet type -- send Code-Reject packet. */
1797 illegal:
1798 if (debug)
1799 log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1800 SPP_ARGS(ifp), cp->name, h->type);
1801 sppp_cp_send(sp, cp->proto, CODE_REJ,
1802 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1803 IFNET_STAT_INC(ifp, ierrors, 1);
1804 }
1805 }
1806
1807
1808 /*
1809 * The generic part of all Up/Down/Open/Close/TO event handlers.
1810 * Basically, the state transition handling in the automaton.
1811 */
1812 static void
1813 sppp_up_event(const struct cp *cp, struct sppp *sp)
1814 {
1815 STDDCL;
1816
1817 if (debug)
1818 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1819 SPP_ARGS(ifp), cp->name,
1820 sppp_state_name(sp->state[cp->protoidx]));
1821
1822 switch (sp->state[cp->protoidx]) {
1823 case STATE_INITIAL:
1824 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1825 break;
1826 case STATE_STARTING:
1827 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1828 (cp->scr)(sp);
1829 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1830 break;
1831 default:
1832 kprintf(SPP_FMT "%s illegal up in state %s\n",
1833 SPP_ARGS(ifp), cp->name,
1834 sppp_state_name(sp->state[cp->protoidx]));
1835 }
1836 }
1837
1838 static void
1839 sppp_down_event(const struct cp *cp, struct sppp *sp)
1840 {
1841 STDDCL;
1842
1843 if (debug)
1844 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1845 SPP_ARGS(ifp), cp->name,
1846 sppp_state_name(sp->state[cp->protoidx]));
1847
1848 switch (sp->state[cp->protoidx]) {
1849 case STATE_CLOSED:
1850 case STATE_CLOSING:
1851 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1852 break;
1853 case STATE_STOPPED:
1854 sppp_cp_change_state(cp, sp, STATE_STARTING);
1855 (cp->tls)(sp);
1856 break;
1857 case STATE_STOPPING:
1858 case STATE_REQ_SENT:
1859 case STATE_ACK_RCVD:
1860 case STATE_ACK_SENT:
1861 sppp_cp_change_state(cp, sp, STATE_STARTING);
1862 break;
1863 case STATE_OPENED:
1864 (cp->tld)(sp);
1865 sppp_cp_change_state(cp, sp, STATE_STARTING);
1866 break;
1867 default:
1868 kprintf(SPP_FMT "%s illegal down in state %s\n",
1869 SPP_ARGS(ifp), cp->name,
1870 sppp_state_name(sp->state[cp->protoidx]));
1871 }
1872 }
1873
1874
1875 static void
1876 sppp_open_event(const struct cp *cp, struct sppp *sp)
1877 {
1878 STDDCL;
1879
1880 if (debug)
1881 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1882 SPP_ARGS(ifp), cp->name,
1883 sppp_state_name(sp->state[cp->protoidx]));
1884
1885 switch (sp->state[cp->protoidx]) {
1886 case STATE_INITIAL:
1887 sppp_cp_change_state(cp, sp, STATE_STARTING);
1888 (cp->tls)(sp);
1889 break;
1890 case STATE_STARTING:
1891 break;
1892 case STATE_CLOSED:
1893 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1894 (cp->scr)(sp);
1895 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1896 break;
1897 case STATE_STOPPED:
1898 /*
1899 * Try escaping stopped state. This seems to bite
1900 * people occasionally, in particular for IPCP,
1901 * presumably following previous IPCP negotiation
1902 * aborts. Somehow, we must have missed a Down event
1903 * which would have caused a transition into starting
1904 * state, so as a bandaid we force the Down event now.
1905 * This effectively implements (something like the)
1906 * `restart' option mentioned in the state transition
1907 * table of RFC 1661.
1908 */
1909 sppp_cp_change_state(cp, sp, STATE_STARTING);
1910 (cp->tls)(sp);
1911 break;
1912 case STATE_STOPPING:
1913 case STATE_REQ_SENT:
1914 case STATE_ACK_RCVD:
1915 case STATE_ACK_SENT:
1916 case STATE_OPENED:
1917 break;
1918 case STATE_CLOSING:
1919 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1920 break;
1921 }
1922 }
1923
1924
1925 static void
1926 sppp_close_event(const struct cp *cp, struct sppp *sp)
1927 {
1928 STDDCL;
1929
1930 if (debug)
1931 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1932 SPP_ARGS(ifp), cp->name,
1933 sppp_state_name(sp->state[cp->protoidx]));
1934
1935 switch (sp->state[cp->protoidx]) {
1936 case STATE_INITIAL:
1937 case STATE_CLOSED:
1938 case STATE_CLOSING:
1939 break;
1940 case STATE_STARTING:
1941 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1942 (cp->tlf)(sp);
1943 break;
1944 case STATE_STOPPED:
1945 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1946 break;
1947 case STATE_STOPPING:
1948 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1949 break;
1950 case STATE_OPENED:
1951 (cp->tld)(sp);
1952 /* fall through */
1953 case STATE_REQ_SENT:
1954 case STATE_ACK_RCVD:
1955 case STATE_ACK_SENT:
1956 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
1957 sppp_cp_send(sp, cp->proto, TERM_REQ,
1958 ++sp->pp_seq[cp->protoidx], 0, 0);
1959 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1960 break;
1961 }
1962 }
1963
1964 static void
1965 sppp_to_event(const struct cp *cp, struct sppp *sp)
1966 {
1967 STDDCL;
1968
1969 crit_enter();
1970
1971 if (debug)
1972 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
1973 SPP_ARGS(ifp), cp->name,
1974 sppp_state_name(sp->state[cp->protoidx]),
1975 sp->rst_counter[cp->protoidx]);
1976
1977 if (--sp->rst_counter[cp->protoidx] < 0)
1978 /* TO- event */
1979 switch (sp->state[cp->protoidx]) {
1980 case STATE_CLOSING:
1981 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1982 (cp->tlf)(sp);
1983 break;
1984 case STATE_STOPPING:
1985 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1986 (cp->tlf)(sp);
1987 break;
1988 case STATE_REQ_SENT:
1989 case STATE_ACK_RCVD:
1990 case STATE_ACK_SENT:
1991 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1992 (cp->tlf)(sp);
1993 break;
1994 }
1995 else
1996 /* TO+ event */
1997 switch (sp->state[cp->protoidx]) {
1998 case STATE_CLOSING:
1999 case STATE_STOPPING:
2000 sppp_cp_send(sp, cp->proto, TERM_REQ,
2001 ++sp->pp_seq[cp->protoidx], 0, 0);
2002 callout_reset(&sp->timeout[cp->protoidx],
2003 sp->lcp.timeout, cp->TO, sp);
2004 break;
2005 case STATE_REQ_SENT:
2006 case STATE_ACK_RCVD:
2007 (cp->scr)(sp);
2008 /* sppp_cp_change_state() will restart the timer */
2009 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2010 break;
2011 case STATE_ACK_SENT:
2012 (cp->scr)(sp);
2013 callout_reset(&sp->timeout[cp->protoidx],
2014 sp->lcp.timeout, cp->TO, sp);
2015 break;
2016 }
2017
2018 crit_exit();
2019 }
2020
2021 /*
2022 * Change the state of a control protocol in the state automaton.
2023 * Takes care of starting/stopping the restart timer.
2024 */
2025 static void
2026 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2027 {
2028 sp->state[cp->protoidx] = newstate;
2029 callout_stop(&sp->timeout[cp->protoidx]);
2030
2031 switch (newstate) {
2032 case STATE_INITIAL:
2033 case STATE_STARTING:
2034 case STATE_CLOSED:
2035 case STATE_STOPPED:
2036 case STATE_OPENED:
2037 break;
2038 case STATE_CLOSING:
2039 case STATE_STOPPING:
2040 case STATE_REQ_SENT:
2041 case STATE_ACK_RCVD:
2042 case STATE_ACK_SENT:
2043 callout_reset(&sp->timeout[cp->protoidx],
2044 sp->lcp.timeout, cp->TO, sp);
2045 break;
2046 }
2047 }
2048
2049 /*
2050 *--------------------------------------------------------------------------*
2051 * *
2052 * The LCP implementation. *
2053 * *
2054 *--------------------------------------------------------------------------*
2055 */
2056 static void
2057 sppp_lcp_init(struct sppp *sp)
2058 {
2059 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2060 sp->lcp.magic = 0;
2061 sp->state[IDX_LCP] = STATE_INITIAL;
2062 sp->fail_counter[IDX_LCP] = 0;
2063 sp->pp_seq[IDX_LCP] = 0;
2064 sp->pp_rseq[IDX_LCP] = 0;
2065 sp->lcp.protos = 0;
2066 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2067
2068 /* Note that these values are relevant for all control protocols */
2069 sp->lcp.timeout = 3 * hz;
2070 sp->lcp.max_terminate = 2;
2071 sp->lcp.max_configure = 10;
2072 sp->lcp.max_failure = 10;
2073 callout_init(&sp->timeout[IDX_LCP]);
2074 }
2075
2076 static void
2077 sppp_lcp_up(struct sppp *sp)
2078 {
2079 STDDCL;
2080
2081 sp->pp_alivecnt = 0;
2082 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2083 sp->lcp.magic = 0;
2084 sp->lcp.protos = 0;
2085 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2086 /*
2087 * If this interface is passive or dial-on-demand, and we are
2088 * still in Initial state, it means we've got an incoming
2089 * call. Activate the interface.
2090 */
2091 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2092 if (debug)
2093 log(LOG_DEBUG,
2094 SPP_FMT "Up event", SPP_ARGS(ifp));
2095 ifp->if_flags |= IFF_RUNNING;
2096 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2097 if (debug)
2098 log(-1, "(incoming call)\n");
2099 sp->pp_flags |= PP_CALLIN;
2100 lcp.Open(sp);
2101 } else if (debug)
2102 log(-1, "\n");
2103 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2104 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2105 ifp->if_flags |= IFF_RUNNING;
2106 lcp.Open(sp);
2107 }
2108
2109 sppp_up_event(&lcp, sp);
2110 }
2111
2112 static void
2113 sppp_lcp_down(struct sppp *sp)
2114 {
2115 STDDCL;
2116
2117 sppp_down_event(&lcp, sp);
2118
2119 /*
2120 * If this is neither a dial-on-demand nor a passive
2121 * interface, simulate an ``ifconfig down'' action, so the
2122 * administrator can force a redial by another ``ifconfig
2123 * up''. XXX For leased line operation, should we immediately
2124 * try to reopen the connection here?
2125 */
2126 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2127 log(LOG_INFO,
2128 SPP_FMT "Down event, taking interface down.\n",
2129 SPP_ARGS(ifp));
2130 if_down(ifp);
2131 } else {
2132 if (debug)
2133 log(LOG_DEBUG,
2134 SPP_FMT "Down event (carrier loss)\n",
2135 SPP_ARGS(ifp));
2136 sp->pp_flags &= ~PP_CALLIN;
2137 if (sp->state[IDX_LCP] != STATE_INITIAL)
2138 lcp.Close(sp);
2139 ifp->if_flags &= ~IFF_RUNNING;
2140 }
2141 }
2142
2143 static void
2144 sppp_lcp_open(struct sppp *sp)
2145 {
2146 /*
2147 * If we are authenticator, negotiate LCP_AUTH
2148 */
2149 if (sp->hisauth.proto != 0)
2150 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2151 else
2152 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2153 sp->pp_flags &= ~PP_NEEDAUTH;
2154 sppp_open_event(&lcp, sp);
2155 }
2156
2157 static void
2158 sppp_lcp_close(struct sppp *sp)
2159 {
2160 sppp_close_event(&lcp, sp);
2161 }
2162
2163 static void
2164 sppp_lcp_TO(void *cookie)
2165 {
2166 sppp_to_event(&lcp, (struct sppp *)cookie);
2167 }
2168
2169 /*
2170 * Analyze a configure request. Return true if it was agreeable, and
2171 * caused action sca, false if it has been rejected or nak'ed, and
2172 * caused action scn. (The return value is used to make the state
2173 * transition decision in the state automaton.)
2174 */
2175 static int
2176 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2177 {
2178 STDDCL;
2179 u_char *buf, *r, *p;
2180 int origlen, rlen;
2181 u_long nmagic;
2182 u_short authproto;
2183
2184 len -= 4;
2185 origlen = len;
2186 buf = r = kmalloc (len, M_TEMP, M_INTWAIT);
2187
2188 if (debug)
2189 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2190 SPP_ARGS(ifp));
2191
2192 /* pass 1: check for things that need to be rejected */
2193 p = (void*) (h+1);
2194 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2195 /* Sanity check option length */
2196 if (p[1] > len) {
2197 /* Malicious option - drop immediately.
2198 * XXX Maybe we should just RXJ it?
2199 */
2200 log(-1, "%s: received malicious LCP option 0x%02x, "
2201 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2202 p[0], p[1], len);
2203 goto drop;
2204 }
2205 if (debug)
2206 log(-1, " %s ", sppp_lcp_opt_name(*p));
2207 switch (*p) {
2208 case LCP_OPT_MAGIC:
2209 /* Magic number. */
2210 if (len >= 6 && p[1] == 6)
2211 continue;
2212 if (debug)
2213 log(-1, "[invalid] ");
2214 break;
2215 case LCP_OPT_ASYNC_MAP:
2216 /* Async control character map. */
2217 if (len >= 6 && p[1] == 6)
2218 continue;
2219 if (debug)
2220 log(-1, "[invalid] ");
2221 break;
2222 case LCP_OPT_MRU:
2223 /* Maximum receive unit. */
2224 if (len >= 4 && p[1] == 4)
2225 continue;
2226 if (debug)
2227 log(-1, "[invalid] ");
2228 break;
2229 case LCP_OPT_AUTH_PROTO:
2230 if (len < 4) {
2231 if (debug)
2232 log(-1, "[invalid] ");
2233 break;
2234 }
2235 authproto = (p[2] << 8) + p[3];
2236 if (authproto == PPP_CHAP && p[1] != 5) {
2237 if (debug)
2238 log(-1, "[invalid chap len] ");
2239 break;
2240 }
2241 if (sp->myauth.proto == 0) {
2242 /* we are not configured to do auth */
2243 if (debug)
2244 log(-1, "[not configured] ");
2245 break;
2246 }
2247 /*
2248 * Remote want us to authenticate, remember this,
2249 * so we stay in PHASE_AUTHENTICATE after LCP got
2250 * up.
2251 */
2252 sp->pp_flags |= PP_NEEDAUTH;
2253 continue;
2254 default:
2255 /* Others not supported. */
2256 if (debug)
2257 log(-1, "[rej] ");
2258 break;
2259 }
2260 /* Add the option to rejected list. */
2261 bcopy (p, r, p[1]);
2262 r += p[1];
2263 rlen += p[1];
2264 }
2265 if (rlen) {
2266 if (debug)
2267 log(-1, " send conf-rej\n");
2268 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2269 return 0;
2270 } else if (debug)
2271 log(-1, "\n");
2272
2273 /*
2274 * pass 2: check for option values that are unacceptable and
2275 * thus require to be nak'ed.
2276 */
2277 if (debug)
2278 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2279 SPP_ARGS(ifp));
2280
2281 p = (void*) (h+1);
2282 len = origlen;
2283 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2284 if (debug)
2285 log(-1, " %s ", sppp_lcp_opt_name(*p));
2286 switch (*p) {
2287 case LCP_OPT_MAGIC:
2288 /* Magic number -- extract. */
2289 nmagic = (u_long)p[2] << 24 |
2290 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2291 if (nmagic != sp->lcp.magic) {
2292 sp->pp_loopcnt = 0;
2293 if (debug)
2294 log(-1, "0x%lx ", nmagic);
2295 continue;
2296 }
2297 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2298 log(-1, "[glitch] ");
2299 ++sp->pp_loopcnt;
2300 /*
2301 * We negate our magic here, and NAK it. If
2302 * we see it later in an NAK packet, we
2303 * suggest a new one.
2304 */
2305 nmagic = ~sp->lcp.magic;
2306 /* Gonna NAK it. */
2307 p[2] = nmagic >> 24;
2308 p[3] = nmagic >> 16;
2309 p[4] = nmagic >> 8;
2310 p[5] = nmagic;
2311 break;
2312
2313 case LCP_OPT_ASYNC_MAP:
2314 /*
2315 * Async control character map -- just ignore it.
2316 *
2317 * Quote from RFC 1662, chapter 6:
2318 * To enable this functionality, synchronous PPP
2319 * implementations MUST always respond to the
2320 * Async-Control-Character-Map Configuration
2321 * Option with the LCP Configure-Ack. However,
2322 * acceptance of the Configuration Option does
2323 * not imply that the synchronous implementation
2324 * will do any ACCM mapping. Instead, all such
2325 * octet mapping will be performed by the
2326 * asynchronous-to-synchronous converter.
2327 */
2328 continue;
2329
2330 case LCP_OPT_MRU:
2331 /*
2332 * Maximum receive unit. Always agreeable,
2333 * but ignored by now.
2334 */
2335 sp->lcp.their_mru = p[2] * 256 + p[3];
2336 if (debug)
2337 log(-1, "%lu ", sp->lcp.their_mru);
2338 continue;
2339
2340 case LCP_OPT_AUTH_PROTO:
2341 authproto = (p[2] << 8) + p[3];
2342 if (sp->myauth.proto != authproto) {
2343 /* not agreed, nak */
2344 if (debug)
2345 log(-1, "[mine %s != his %s] ",
2346 sppp_proto_name(sp->hisauth.proto),
2347 sppp_proto_name(authproto));
2348 p[2] = sp->myauth.proto >> 8;
2349 p[3] = sp->myauth.proto;
2350 break;
2351 }
2352 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2353 if (debug)
2354 log(-1, "[chap not MD5] ");
2355 p[4] = CHAP_MD5;
2356 break;
2357 }
2358 continue;
2359 }
2360 /* Add the option to nak'ed list. */
2361 bcopy (p, r, p[1]);
2362 r += p[1];
2363 rlen += p[1];
2364 }
2365 if (rlen) {
2366 /*
2367 * Local and remote magics equal -- loopback?
2368 */
2369 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2370 if (sp->pp_loopcnt == MAXALIVECNT*5)
2371 kprintf (SPP_FMT "loopback\n",
2372 SPP_ARGS(ifp));
2373 if (ifp->if_flags & IFF_UP) {
2374 if_down(ifp);
2375 IF_DRAIN(&sp->pp_cpq);
2376 /* XXX ? */
2377 lcp.Down(sp);
2378 lcp.Up(sp);
2379 }
2380 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2381 if (debug)
2382 log(-1, " max_failure (%d) exceeded, "
2383 "send conf-rej\n",
2384 sp->lcp.max_failure);
2385 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2386 } else {
2387 if (debug)
2388 log(-1, " send conf-nak\n");
2389 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2390 }
2391 } else {
2392 if (debug)
2393 log(-1, " send conf-ack\n");
2394 sp->fail_counter[IDX_LCP] = 0;
2395 sp->pp_loopcnt = 0;
2396 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2397 h->ident, origlen, h+1);
2398 }
2399
2400 kfree (buf, M_TEMP);
2401 return (rlen == 0);
2402
2403 drop:
2404 kfree(buf, M_TEMP);
2405 return (-1);
2406 }
2407
2408 /*
2409 * Analyze the LCP Configure-Reject option list, and adjust our
2410 * negotiation.
2411 */
2412 static void
2413 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2414 {
2415 STDDCL;
2416 u_char *buf, *p;
2417
2418 len -= 4;
2419 buf = kmalloc (len, M_TEMP, M_INTWAIT);
2420
2421 if (debug)
2422 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2423 SPP_ARGS(ifp));
2424
2425 p = (void*) (h+1);
2426 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2427 /* Sanity check option length */
2428 if (p[1] > len) {
2429 /*
2430 * Malicious option - drop immediately.
2431 * XXX Maybe we should just RXJ it?
2432 */
2433 log(-1, "%s: received malicious LCP option, "
2434 "dropping.\n", ifp->if_xname);
2435 goto drop;
2436 }
2437 if (debug)
2438 log(-1, " %s ", sppp_lcp_opt_name(*p));
2439 switch (*p) {
2440 case LCP_OPT_MAGIC:
2441 /* Magic number -- can't use it, use 0 */
2442 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2443 sp->lcp.magic = 0;
2444 break;
2445 case LCP_OPT_MRU:
2446 /*
2447 * Should not be rejected anyway, since we only
2448 * negotiate a MRU if explicitly requested by
2449 * peer.
2450 */
2451 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2452 break;
2453 case LCP_OPT_AUTH_PROTO:
2454 /*
2455 * Peer doesn't want to authenticate himself,
2456 * deny unless this is a dialout call, and
2457 * AUTHFLAG_NOCALLOUT is set.
2458 */
2459 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2460 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2461 if (debug)
2462 log(-1, "[don't insist on auth "
2463 "for callout]");
2464 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2465 break;
2466 }
2467 if (debug)
2468 log(-1, "[access denied]\n");
2469 lcp.Close(sp);
2470 break;
2471 }
2472 }
2473 if (debug)
2474 log(-1, "\n");
2475 drop:
2476 kfree (buf, M_TEMP);
2477 return;
2478 }
2479
2480 /*
2481 * Analyze the LCP Configure-NAK option list, and adjust our
2482 * negotiation.
2483 */
2484 static void
2485 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2486 {
2487 STDDCL;
2488 u_char *buf, *p;
2489 u_long magic;
2490
2491 len -= 4;
2492 buf = kmalloc (len, M_TEMP, M_INTWAIT);
2493
2494 if (debug)
2495 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2496 SPP_ARGS(ifp));
2497
2498 p = (void*) (h+1);
2499 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2500 /* Sanity check option length */
2501 if (p[1] > len) {
2502 /*
2503 * Malicious option - drop immediately.
2504 * XXX Maybe we should just RXJ it?
2505 */
2506 log(-1, "%s: received malicious LCP option, "
2507 "dropping.\n", ifp->if_xname);
2508 goto drop;
2509 }
2510 if (debug)
2511 log(-1, " %s ", sppp_lcp_opt_name(*p));
2512 switch (*p) {
2513 case LCP_OPT_MAGIC:
2514 /* Magic number -- renegotiate */
2515 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2516 len >= 6 && p[1] == 6) {
2517 magic = (u_long)p[2] << 24 |
2518 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2519 /*
2520 * If the remote magic is our negated one,
2521 * this looks like a loopback problem.
2522 * Suggest a new magic to make sure.
2523 */
2524 if (magic == ~sp->lcp.magic) {
2525 if (debug)
2526 log(-1, "magic glitch ");
2527 sp->lcp.magic = krandom();
2528 } else {
2529 sp->lcp.magic = magic;
2530 if (debug)
2531 log(-1, "%lu ", magic);
2532 }
2533 }
2534 break;
2535 case LCP_OPT_MRU:
2536 /*
2537 * Peer wants to advise us to negotiate an MRU.
2538 * Agree on it if it's reasonable, or use
2539 * default otherwise.
2540 */
2541 if (len >= 4 && p[1] == 4) {
2542 u_int mru = p[2] * 256 + p[3];
2543 if (debug)
2544 log(-1, "%d ", mru);
2545 if (mru < PP_MTU || mru > PP_MAX_MRU)
2546 mru = PP_MTU;
2547 sp->lcp.mru = mru;
2548 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2549 }
2550 break;
2551 case LCP_OPT_AUTH_PROTO:
2552 /*
2553 * Peer doesn't like our authentication method,
2554 * deny.
2555 */
2556 if (debug)
2557 log(-1, "[access denied]\n");
2558 lcp.Close(sp);
2559 break;
2560 }
2561 }
2562 if (debug)
2563 log(-1, "\n");
2564 drop:
2565 kfree (buf, M_TEMP);
2566 return;
2567 }
2568
2569 static void
2570 sppp_lcp_tlu(struct sppp *sp)
2571 {
2572 STDDCL;
2573 int i;
2574 u_long mask;
2575
2576 /* XXX ? */
2577 if (! (ifp->if_flags & IFF_UP) &&
2578 (ifp->if_flags & IFF_RUNNING)) {
2579 /* Coming out of loopback mode. */
2580 if_up(ifp);
2581 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
2582 }
2583
2584 for (i = 0; i < IDX_COUNT; i++)
2585 if ((cps[i])->flags & CP_QUAL)
2586 (cps[i])->Open(sp);
2587
2588 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2589 (sp->pp_flags & PP_NEEDAUTH) != 0)
2590 sp->pp_phase = PHASE_AUTHENTICATE;
2591 else
2592 sp->pp_phase = PHASE_NETWORK;
2593
2594 if (debug)
2595 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2596 sppp_phase_name(sp->pp_phase));
2597
2598 /*
2599 * Open all authentication protocols. This is even required
2600 * if we already proceeded to network phase, since it might be
2601 * that remote wants us to authenticate, so we might have to
2602 * send a PAP request. Undesired authentication protocols
2603 * don't do anything when they get an Open event.
2604 */
2605 for (i = 0; i < IDX_COUNT; i++)
2606 if ((cps[i])->flags & CP_AUTH)
2607 (cps[i])->Open(sp);
2608
2609 if (sp->pp_phase == PHASE_NETWORK) {
2610 /* Notify all NCPs. */
2611 for (i = 0; i < IDX_COUNT; i++)
2612 if (((cps[i])->flags & CP_NCP) &&
2613 /*
2614 * XXX
2615 * Hack to administratively disable IPv6 if
2616 * not desired. Perhaps we should have another
2617 * flag for this, but right now, we can make
2618 * all struct cp's read/only.
2619 */
2620 (cps[i] != &ipv6cp ||
2621 (sp->confflags & CONF_ENABLE_IPV6)))
2622 (cps[i])->Open(sp);
2623 }
2624
2625 /* Send Up events to all started protos. */
2626 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2627 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2628 (cps[i])->Up(sp);
2629
2630 /* notify low-level driver of state change */
2631 if (sp->pp_chg)
2632 sp->pp_chg(sp, (int)sp->pp_phase);
2633
2634 if (sp->pp_phase == PHASE_NETWORK)
2635 /* if no NCP is starting, close down */
2636 sppp_lcp_check_and_close(sp);
2637 }
2638
2639 static void
2640 sppp_lcp_tld(struct sppp *sp)
2641 {
2642 STDDCL;
2643 int i;
2644 u_long mask;
2645
2646 sp->pp_phase = PHASE_TERMINATE;
2647
2648 if (debug)
2649 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2650 sppp_phase_name(sp->pp_phase));
2651
2652 /*
2653 * Take upper layers down. We send the Down event first and
2654 * the Close second to prevent the upper layers from sending
2655 * ``a flurry of terminate-request packets'', as the RFC
2656 * describes it.
2657 */
2658 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2659 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2660 (cps[i])->Down(sp);
2661 (cps[i])->Close(sp);
2662 }
2663 }
2664
2665 static void
2666 sppp_lcp_tls(struct sppp *sp)
2667 {
2668 STDDCL;
2669
2670 sp->pp_phase = PHASE_ESTABLISH;
2671
2672 if (debug)
2673 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2674 sppp_phase_name(sp->pp_phase));
2675
2676 /* Notify lower layer if desired. */
2677 if (sp->pp_tls)
2678 (sp->pp_tls)(sp);
2679 else
2680 (sp->pp_up)(sp);
2681 }
2682
2683 static void
2684 sppp_lcp_tlf(struct sppp *sp)
2685 {
2686 STDDCL;
2687
2688 sp->pp_phase = PHASE_DEAD;
2689 if (debug)
2690 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2691 sppp_phase_name(sp->pp_phase));
2692
2693 /* Notify lower layer if desired. */
2694 if (sp->pp_tlf)
2695 (sp->pp_tlf)(sp);
2696 else
2697 (sp->pp_down)(sp);
2698 }
2699
2700 static void
2701 sppp_lcp_scr(struct sppp *sp)
2702 {
2703 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2704 int i = 0;
2705 u_short authproto;
2706
2707 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2708 if (! sp->lcp.magic)
2709 sp->lcp.magic = krandom();
2710 opt[i++] = LCP_OPT_MAGIC;
2711 opt[i++] = 6;
2712 opt[i++] = sp->lcp.magic >> 24;
2713 opt[i++] = sp->lcp.magic >> 16;
2714 opt[i++] = sp->lcp.magic >> 8;
2715 opt[i++] = sp->lcp.magic;
2716 }
2717
2718 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2719 opt[i++] = LCP_OPT_MRU;
2720 opt[i++] = 4;
2721 opt[i++] = sp->lcp.mru >> 8;
2722 opt[i++] = sp->lcp.mru;
2723 }
2724
2725 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2726 authproto = sp->hisauth.proto;
2727 opt[i++] = LCP_OPT_AUTH_PROTO;
2728 opt[i++] = authproto == PPP_CHAP? 5: 4;
2729 opt[i++] = authproto >> 8;
2730 opt[i++] = authproto;
2731 if (authproto == PPP_CHAP)
2732 opt[i++] = CHAP_MD5;
2733 }
2734
2735 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2736 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2737 }
2738
2739 /*
2740 * Check the open NCPs, return true if at least one NCP is open.
2741 */
2742 static int
2743 sppp_ncp_check(struct sppp *sp)
2744 {
2745 int i, mask;
2746
2747 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2748 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2749 return 1;
2750 return 0;
2751 }
2752
2753 /*
2754 * Re-check the open NCPs and see if we should terminate the link.
2755 * Called by the NCPs during their tlf action handling.
2756 */
2757 static void
2758 sppp_lcp_check_and_close(struct sppp *sp)
2759 {
2760
2761 if (sp->pp_phase < PHASE_NETWORK)
2762 /* don't bother, we are already going down */
2763 return;
2764
2765 if (sppp_ncp_check(sp))
2766 return;
2767
2768 lcp.Close(sp);
2769 }
2770
2771 /*
2772 *--------------------------------------------------------------------------*
2773 * *
2774 * The IPCP implementation. *
2775 * *
2776 *--------------------------------------------------------------------------*
2777 */
2778
2779 static void
2780 sppp_ipcp_init(struct sppp *sp)
2781 {
2782 sp->ipcp.opts = 0;
2783 sp->ipcp.flags = 0;
2784 sp->state[IDX_IPCP] = STATE_INITIAL;
2785 sp->fail_counter[IDX_IPCP] = 0;
2786 sp->pp_seq[IDX_IPCP] = 0;
2787 sp->pp_rseq[IDX_IPCP] = 0;
2788 callout_init(&sp->timeout[IDX_IPCP]);
2789 }
2790
2791 static void
2792 sppp_ipcp_up(struct sppp *sp)
2793 {
2794 sppp_up_event(&ipcp, sp);
2795 }
2796
2797 static void
2798 sppp_ipcp_down(struct sppp *sp)
2799 {
2800 sppp_down_event(&ipcp, sp);
2801 }
2802
2803 static void
2804 sppp_ipcp_open(struct sppp *sp)
2805 {
2806 STDDCL;
2807 u_long myaddr, hisaddr;
2808
2809 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2810 IPCP_MYADDR_DYN | IPCP_VJ);
2811 sp->ipcp.opts = 0;
2812
2813 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2814 /*
2815 * If we don't have his address, this probably means our
2816 * interface doesn't want to talk IP at all. (This could
2817 * be the case if somebody wants to speak only IPX, for
2818 * example.) Don't open IPCP in this case.
2819 */
2820 if (hisaddr == 0L) {
2821 /* XXX this message should go away */
2822 if (debug)
2823 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2824 SPP_ARGS(ifp));
2825 return;
2826 }
2827 if (myaddr == 0L) {
2828 /*
2829 * I don't have an assigned address, so i need to
2830 * negotiate my address.
2831 */
2832 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2833 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2834 } else
2835 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2836 if (sp->confflags & CONF_ENABLE_VJ) {
2837 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2838 sp->ipcp.max_state = MAX_STATES - 1;
2839 sp->ipcp.compress_cid = 1;
2840 }
2841 sppp_open_event(&ipcp, sp);
2842 }
2843
2844 static void
2845 sppp_ipcp_close(struct sppp *sp)
2846 {
2847 sppp_close_event(&ipcp, sp);
2848 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2849 /*
2850 * My address was dynamic, clear it again.
2851 */
2852 sppp_set_ip_addr(sp, 0L);
2853 }
2854
2855 static void
2856 sppp_ipcp_TO(void *cookie)
2857 {
2858 sppp_to_event(&ipcp, (struct sppp *)cookie);
2859 }
2860
2861 /*
2862 * Analyze a configure request. Return true if it was agreeable, and
2863 * caused action sca, false if it has been rejected or nak'ed, and
2864 * caused action scn. (The return value is used to make the state
2865 * transition decision in the state automaton.)
2866 */
2867 static int
2868 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2869 {
2870 u_char *buf, *r, *p;
2871 struct ifnet *ifp = &sp->pp_if;
2872 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2873 u_long hisaddr, desiredaddr;
2874 int gotmyaddr = 0;
2875 int desiredcomp;
2876
2877 len -= 4;
2878 origlen = len;
2879 /*
2880 * Make sure to allocate a buf that can at least hold a
2881 * conf-nak with an `address' option. We might need it below.
2882 */
2883 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2884
2885 /* pass 1: see if we can recognize them */
2886 if (debug)
2887 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2888 SPP_ARGS(ifp));
2889 p = (void*) (h+1);
2890 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2891 /* Sanity check option length */
2892 if (p[1] > len) {
2893 /* XXX should we just RXJ? */
2894 log(-1, "%s: malicious IPCP option received, dropping\n",
2895 ifp->if_xname);
2896 goto drop;
2897 }
2898 if (debug)
2899 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2900 switch (*p) {
2901 case IPCP_OPT_COMPRESSION:
2902 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2903 /* VJ compression administratively disabled */
2904 if (debug)
2905 log(-1, "[locally disabled] ");
2906 break;
2907 }
2908 /*
2909 * In theory, we should only conf-rej an
2910 * option that is shorter than RFC 1618
2911 * requires (i.e. < 4), and should conf-nak
2912 * anything else that is not VJ. However,
2913 * since our algorithm always uses the
2914 * original option to NAK it with new values,
2915 * things would become more complicated. In
2916 * pratice, the only commonly implemented IP
2917 * compression option is VJ anyway, so the
2918 * difference is negligible.
2919 */
2920 if (len >= 6 && p[1] == 6) {
2921 /*
2922 * correctly formed compression option
2923 * that could be VJ compression
2924 */
2925 continue;
2926 }
2927 if (debug)
2928 log(-1, "optlen %d [invalid/unsupported] ",
2929 p[1]);
2930 break;
2931 case IPCP_OPT_ADDRESS:
2932 if (len >= 6 && p[1] == 6) {
2933 /* correctly formed address option */
2934 continue;
2935 }
2936 if (debug)
2937 log(-1, "[invalid] ");
2938 break;
2939 default:
2940 /* Others not supported. */
2941 if (debug)
2942 log(-1, "[rej] ");
2943 break;
2944 }
2945 /* Add the option to rejected list. */
2946 bcopy (p, r, p[1]);
2947 r += p[1];
2948 rlen += p[1];
2949 }
2950 if (rlen) {
2951 if (debug)
2952 log(-1, " send conf-rej\n");
2953 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2954 return 0;
2955 } else if (debug)
2956 log(-1, "\n");
2957
2958 /* pass 2: parse option values */
2959 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
2960 if (debug)
2961 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
2962 SPP_ARGS(ifp));
2963 p = (void*) (h+1);
2964 len = origlen;
2965 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2966 if (debug)
2967 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2968 switch (*p) {
2969 case IPCP_OPT_COMPRESSION:
2970 desiredcomp = p[2] << 8 | p[3];
2971 /* We only support VJ */
2972 if (desiredcomp == IPCP_COMP_VJ) {
2973 if (debug)
2974 log(-1, "VJ [ack] ");
2975 sp->ipcp.flags |= IPCP_VJ;
2976 sl_compress_init(sp->pp_comp, p[4]);
2977 sp->ipcp.max_state = p[4];
2978 sp->ipcp.compress_cid = p[5];
2979 continue;
2980 }
2981 if (debug)
2982 log(-1, "compproto %#04x [not supported] ",
2983 desiredcomp);
2984 p[2] = IPCP_COMP_VJ >> 8;
2985 p[3] = IPCP_COMP_VJ;
2986 p[4] = sp->ipcp.max_state;
2987 p[5] = sp->ipcp.compress_cid;
2988 break;
2989 case IPCP_OPT_ADDRESS:
2990 /* This is the address he wants in his end */
2991 desiredaddr = p[2] << 24 | p[3] << 16 |
2992 p[4] << 8 | p[5];
2993 if (desiredaddr == hisaddr ||
2994 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
2995 /*
2996 * Peer's address is same as our value,
2997 * or we have set it to 0.0.0.* to
2998 * indicate that we do not really care,
2999 * this is agreeable. Gonna conf-ack
3000 * it.
3001 */
3002 if (debug)
3003 log(-1, "%s [ack] ",
3004 sppp_dotted_quad(hisaddr));
3005 /* record that we've seen it already */
3006 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3007 continue;
3008 }
3009 /*
3010 * The address wasn't agreeable. This is either
3011 * he sent us 0.0.0.0, asking to assign him an
3012 * address, or he send us another address not
3013 * matching our value. Either case, we gonna
3014 * conf-nak it with our value.
3015 * XXX: we should "rej" if hisaddr == 0
3016 */
3017 if (debug) {
3018 if (desiredaddr == 0)
3019 log(-1, "[addr requested] ");
3020 else
3021 log(-1, "%s [not agreed] ",
3022 sppp_dotted_quad(desiredaddr));
3023
3024 }
3025 p[2] = hisaddr >> 24;
3026 p[3] = hisaddr >> 16;
3027 p[4] = hisaddr >> 8;
3028 p[5] = hisaddr;
3029 break;
3030 }
3031 /* Add the option to nak'ed list. */
3032 bcopy (p, r, p[1]);
3033 r += p[1];
3034 rlen += p[1];
3035 }
3036
3037 /*
3038 * If we are about to conf-ack the request, but haven't seen
3039 * his address so far, gonna conf-nak it instead, with the
3040 * `address' option present and our idea of his address being
3041 * filled in there, to request negotiation of both addresses.
3042 *
3043 * XXX This can result in an endless req - nak loop if peer
3044 * doesn't want to send us his address. Q: What should we do
3045 * about it? XXX A: implement the max-failure counter.
3046 */
3047 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3048 buf[0] = IPCP_OPT_ADDRESS;
3049 buf[1] = 6;
3050 buf[2] = hisaddr >> 24;
3051 buf[3] = hisaddr >> 16;
3052 buf[4] = hisaddr >> 8;
3053 buf[5] = hisaddr;
3054 rlen = 6;
3055 if (debug)
3056 log(-1, "still need hisaddr ");
3057 }
3058
3059 if (rlen) {
3060 if (debug)
3061 log(-1, " send conf-nak\n");
3062 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3063 } else {
3064 if (debug)
3065 log(-1, " send conf-ack\n");
3066 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3067 h->ident, origlen, h+1);
3068 }
3069
3070 kfree (buf, M_TEMP);
3071 return (rlen == 0);
3072
3073 drop:
3074 kfree(buf, M_TEMP);
3075 return (-1);
3076 }
3077
3078 /*
3079 * Analyze the IPCP Configure-Reject option list, and adjust our
3080 * negotiation.
3081 */
3082 static void
3083 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3084 {
3085 u_char *buf, *p;
3086 struct ifnet *ifp = &sp->pp_if;
3087 int debug = ifp->if_flags & IFF_DEBUG;
3088
3089 len -= 4;
3090 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3091
3092 if (debug)
3093 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3094 SPP_ARGS(ifp));
3095
3096 p = (void*) (h+1);
3097 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3098 /* Sanity check option length */
3099 if (p[1] > len) {
3100 /* XXX should we just RXJ? */
3101 log(-1, "%s: malicious IPCP option received, dropping\n",
3102 ifp->if_xname);
3103 goto drop;
3104 }
3105 if (debug)
3106 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3107 switch (*p) {
3108 case IPCP_OPT_COMPRESSION:
3109 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3110 break;
3111 case IPCP_OPT_ADDRESS:
3112 /*
3113 * Peer doesn't grok address option. This is
3114 * bad. XXX Should we better give up here?
3115 * XXX We could try old "addresses" option...
3116 */
3117 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3118 break;
3119 }
3120 }
3121 if (debug)
3122 log(-1, "\n");
3123 drop:
3124 kfree (buf, M_TEMP);
3125 return;
3126 }
3127
3128 /*
3129 * Analyze the IPCP Configure-NAK option list, and adjust our
3130 * negotiation.
3131 */
3132 static void
3133 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3134 {
3135 u_char *buf, *p;
3136 struct ifnet *ifp = &sp->pp_if;
3137 int debug = ifp->if_flags & IFF_DEBUG;
3138 int desiredcomp;
3139 u_long wantaddr;
3140
3141 len -= 4;
3142 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3143
3144 if (debug)
3145 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3146 SPP_ARGS(ifp));
3147
3148 p = (void*) (h+1);
3149 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3150 /* Sanity check option length */
3151 if (p[1] > len) {
3152 /* XXX should we just RXJ? */
3153 log(-1, "%s: malicious IPCP option received, dropping\n",
3154 ifp->if_xname);
3155 return;
3156 }
3157 if (debug)
3158 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3159 switch (*p) {
3160 case IPCP_OPT_COMPRESSION:
3161 if (len >= 6 && p[1] == 6) {
3162 desiredcomp = p[2] << 8 | p[3];
3163 if (debug)
3164 log(-1, "[wantcomp %#04x] ",
3165 desiredcomp);
3166 if (desiredcomp == IPCP_COMP_VJ) {
3167 sl_compress_init(sp->pp_comp, p[4]);
3168 sp->ipcp.max_state = p[4];
3169 sp->ipcp.compress_cid = p[5];
3170 if (debug)
3171 log(-1, "[agree] ");
3172 } else
3173 sp->ipcp.opts &=
3174 ~(1 << IPCP_OPT_COMPRESSION);
3175 }
3176 break;
3177 case IPCP_OPT_ADDRESS:
3178 /*
3179 * Peer doesn't like our local IP address. See
3180 * if we can do something for him. We'll drop
3181 * him our address then.
3182 */
3183 if (len >= 6 && p[1] == 6) {
3184 wantaddr = p[2] << 24 | p[3] << 16 |
3185 p[4] << 8 | p[5];
3186 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3187 if (debug)
3188 log(-1, "[wantaddr %s] ",
3189 sppp_dotted_quad(wantaddr));
3190 /*
3191 * When doing dynamic address assignment,
3192 * we accept his offer. Otherwise, we
3193 * ignore it and thus continue to negotiate
3194 * our already existing value.
3195 * XXX: Bogus, if he said no once, he'll
3196 * just say no again, might as well die.
3197 */
3198 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3199 sppp_set_ip_addr(sp, wantaddr);
3200 if (debug)
3201 log(-1, "[agree] ");
3202 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3203 }
3204 }
3205 break;
3206 }
3207 }
3208 if (debug)
3209 log(-1, "\n");
3210 kfree (buf, M_TEMP);
3211 return;
3212 }
3213
3214 static void
3215 sppp_ipcp_tlu(struct sppp *sp)
3216 {
3217 /* we are up - notify isdn daemon */
3218 if (sp->pp_con)
3219 sp->pp_con(sp);
3220 }
3221
3222 static void
3223 sppp_ipcp_tld(struct sppp *sp)
3224 {
3225 }
3226
3227 static void
3228 sppp_ipcp_tls(struct sppp *sp)
3229 {
3230 /* indicate to LCP that it must stay alive */
3231 sp->lcp.protos |= (1 << IDX_IPCP);
3232 }
3233
3234 static void
3235 sppp_ipcp_tlf(struct sppp *sp)
3236 {
3237 /* we no longer need LCP */
3238 sp->lcp.protos &= ~(1 << IDX_IPCP);
3239 sppp_lcp_check_and_close(sp);
3240 }
3241
3242 static void
3243 sppp_ipcp_scr(struct sppp *sp)
3244 {
3245 char opt[6 /* compression */ + 6 /* address */];
3246 u_long ouraddr;
3247 int i = 0;
3248
3249 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3250 opt[i++] = IPCP_OPT_COMPRESSION;
3251 opt[i++] = 6;
3252 opt[i++] = IPCP_COMP_VJ >> 8;
3253 opt[i++] = IPCP_COMP_VJ;
3254 opt[i++] = sp->ipcp.max_state;
3255 opt[i++] = sp->ipcp.compress_cid;
3256 }
3257 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3258 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3259 opt[i++] = IPCP_OPT_ADDRESS;
3260 opt[i++] = 6;
3261 opt[i++] = ouraddr >> 24;
3262 opt[i++] = ouraddr >> 16;
3263 opt[i++] = ouraddr >> 8;
3264 opt[i++] = ouraddr;
3265 }
3266
3267 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3268 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3269 }
3270
3271 /*
3272 *--------------------------------------------------------------------------*
3273 * *
3274 * The IPv6CP implementation. *
3275 * *
3276 *--------------------------------------------------------------------------*
3277 */
3278
3279 #ifdef INET6
3280 static void
3281 sppp_ipv6cp_init(struct sppp *sp)
3282 {
3283 sp->ipv6cp.opts = 0;
3284 sp->ipv6cp.flags = 0;
3285 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3286 sp->fail_counter[IDX_IPV6CP] = 0;
3287 sp->pp_seq[IDX_IPV6CP] = 0;
3288 sp->pp_rseq[IDX_IPV6CP] = 0;
3289 callout_init(&sp->timeout[IDX_IPV6CP]);
3290 }
3291
3292 static void
3293 sppp_ipv6cp_up(struct sppp *sp)
3294 {
3295 sppp_up_event(&ipv6cp, sp);
3296 }
3297
3298 static void
3299 sppp_ipv6cp_down(struct sppp *sp)
3300 {
3301 sppp_down_event(&ipv6cp, sp);
3302 }
3303
3304 static void
3305 sppp_ipv6cp_open(struct sppp *sp)
3306 {
3307 STDDCL;
3308 struct in6_addr myaddr, hisaddr;
3309
3310 #ifdef IPV6CP_MYIFID_DYN
3311 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3312 #else
3313 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3314 #endif
3315
3316 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3317 /*
3318 * If we don't have our address, this probably means our
3319 * interface doesn't want to talk IPv6 at all. (This could
3320 * be the case if somebody wants to speak only IPX, for
3321 * example.) Don't open IPv6CP in this case.
3322 */
3323 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3324 /* XXX this message should go away */
3325 if (debug)
3326 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3327 SPP_ARGS(ifp));
3328 return;
3329 }
3330
3331 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3332 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3333 sppp_open_event(&ipv6cp, sp);
3334 }
3335
3336 static void
3337 sppp_ipv6cp_close(struct sppp *sp)
3338 {
3339 sppp_close_event(&ipv6cp, sp);
3340 }
3341
3342 static void
3343 sppp_ipv6cp_TO(void *cookie)
3344 {
3345 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3346 }
3347
3348 /*
3349 * Analyze a configure request. Return true if it was agreeable, and
3350 * caused action sca, false if it has been rejected or nak'ed, and
3351 * caused action scn. (The return value is used to make the state
3352 * transition decision in the state automaton.)
3353 */
3354 static int
3355 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3356 {
3357 u_char *buf, *r, *p;
3358 struct ifnet *ifp = &sp->pp_if;
3359 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3360 struct in6_addr myaddr, desiredaddr, suggestaddr;
3361 int ifidcount;
3362 int type;
3363 int collision, nohisaddr;
3364
3365 len -= 4;
3366 origlen = len;
3367 /*
3368 * Make sure to allocate a buf that can at least hold a
3369 * conf-nak with an `address' option. We might need it below.
3370 */
3371 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3372
3373 /* pass 1: see if we can recognize them */
3374 if (debug)
3375 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3376 SPP_ARGS(ifp));
3377 p = (void*) (h+1);
3378 ifidcount = 0;
3379 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3380 /* Sanity check option length */
3381 if (p[1] > len) {
3382 /* XXX just RXJ? */
3383 log(-1, "%s: received malicious IPCPv6 option, "
3384 "dropping\n", ifp->if_xname);
3385 goto drop;
3386 }
3387 if (debug)
3388 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3389 switch (*p) {
3390 case IPV6CP_OPT_IFID:
3391 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3392 /* correctly formed address option */
3393 ifidcount++;
3394 continue;
3395 }
3396 if (debug)
3397 log(-1, " [invalid]");
3398 break;
3399 #ifdef notyet
3400 case IPV6CP_OPT_COMPRESSION:
3401 if (len >= 4 && p[1] >= 4) {
3402 /* correctly formed compress option */
3403 continue;
3404 }
3405 if (debug)
3406 log(-1, " [invalid]");
3407 break;
3408 #endif
3409 default:
3410 /* Others not supported. */
3411 if (debug)
3412 log(-1, " [rej]");
3413 break;
3414 }
3415 /* Add the option to rejected list. */
3416 bcopy (p, r, p[1]);
3417 r += p[1];
3418 rlen += p[1];
3419 }
3420 if (rlen) {
3421 if (debug)
3422 log(-1, " send conf-rej\n");
3423 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3424 goto end;
3425 } else if (debug)
3426 log(-1, "\n");
3427
3428 /* pass 2: parse option values */
3429 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3430 if (debug)
3431 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3432 SPP_ARGS(ifp));
3433 p = (void*) (h+1);
3434 len = origlen;
3435 type = CONF_ACK;
3436 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3437 if (debug)
3438 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3439 switch (*p) {
3440 #ifdef notyet
3441 case IPV6CP_OPT_COMPRESSION:
3442 continue;
3443 #endif
3444 case IPV6CP_OPT_IFID:
3445 bzero(&desiredaddr, sizeof(desiredaddr));
3446 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3447 collision = (bcmp(&desiredaddr.s6_addr[8],
3448 &myaddr.s6_addr[8], 8) == 0);
3449 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3450
3451 desiredaddr.s6_addr16[0] = htons(0xfe80);
3452 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3453
3454 if (!collision && !nohisaddr) {
3455 /* no collision, hisaddr known - Conf-Ack */
3456 type = CONF_ACK;
3457
3458 if (debug) {
3459 log(-1, " %s [%s]",
3460 ip6_sprintf(&desiredaddr),
3461 sppp_cp_type_name(type));
3462 }
3463 continue;
3464 }
3465
3466 bzero(&suggestaddr, sizeof(suggestaddr));
3467 if (collision && nohisaddr) {
3468 /* collision, hisaddr unknown - Conf-Rej */
3469 type = CONF_REJ;
3470 bzero(&p[2], 8);
3471 } else {
3472 /*
3473 * - no collision, hisaddr unknown, or
3474 * - collision, hisaddr known
3475 * Conf-Nak, suggest hisaddr
3476 */
3477 type = CONF_NAK;
3478 sppp_suggest_ip6_addr(sp, &suggestaddr);
3479 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3480 }
3481 if (debug)
3482 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr),
3483 sppp_cp_type_name(type));
3484 break;
3485 }
3486 /* Add the option to nak'ed list. */
3487 bcopy (p, r, p[1]);
3488 r += p[1];
3489 rlen += p[1];
3490 }
3491
3492 if (rlen == 0 && type == CONF_ACK) {
3493 if (debug)
3494 log(-1, " send %s\n", sppp_cp_type_name(type));
3495 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3496 } else {
3497 #ifdef DIAGNOSTIC
3498 if (type == CONF_ACK)
3499 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3500 #endif
3501
3502 if (debug) {
3503 log(-1, " send %s suggest %s\n",
3504 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3505 }
3506 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3507 }
3508
3509 end:
3510 kfree (buf, M_TEMP);
3511 return (rlen == 0);
3512
3513 drop:
3514 kfree(buf, M_TEMP);
3515 return (-1);
3516 }
3517
3518 /*
3519 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3520 * negotiation.
3521 */
3522 static void
3523 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3524 {
3525 u_char *buf, *p;
3526 struct ifnet *ifp = &sp->pp_if;
3527 int debug = ifp->if_flags & IFF_DEBUG;
3528
3529 len -= 4;
3530 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3531
3532 if (debug)
3533 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3534 SPP_ARGS(ifp));
3535
3536 p = (void*) (h+1);
3537 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3538 if (p[1] > len) {
3539 /* XXX just RXJ? */
3540 log(-1, "%s: received malicious IPCPv6 option, "
3541 "dropping\n", ifp->if_xname);
3542 goto drop;
3543 }
3544 if (debug)
3545 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3546 switch (*p) {
3547 case IPV6CP_OPT_IFID:
3548 /*
3549 * Peer doesn't grok address option. This is
3550 * bad. XXX Should we better give up here?
3551 */
3552 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3553 break;
3554 #ifdef notyet
3555 case IPV6CP_OPT_COMPRESS:
3556 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3557 break;
3558 #endif
3559 }
3560 }
3561 if (debug)
3562 log(-1, "\n");
3563 drop:
3564 kfree (buf, M_TEMP);
3565 return;
3566 }
3567
3568 /*
3569 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3570 * negotiation.
3571 */
3572 static void
3573 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3574 {
3575 u_char *buf, *p;
3576 struct ifnet *ifp = &sp->pp_if;
3577 int debug = ifp->if_flags & IFF_DEBUG;
3578 struct in6_addr suggestaddr;
3579
3580 len -= 4;
3581 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3582
3583 if (debug)
3584 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3585 SPP_ARGS(ifp));
3586
3587 p = (void*) (h+1);
3588 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3589 if (p[1] > len) {
3590 /* XXX just RXJ? */
3591 log(-1, "%s: received malicious IPCPv6 option, "
3592 "dropping\n", ifp->if_xname);
3593 goto drop;
3594 }
3595 if (debug)
3596 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3597 switch (*p) {
3598 case IPV6CP_OPT_IFID:
3599 /*
3600 * Peer doesn't like our local ifid. See
3601 * if we can do something for him. We'll drop
3602 * him our address then.
3603 */
3604 if (len < 10 || p[1] != 10)
3605 break;
3606 bzero(&suggestaddr, sizeof(suggestaddr));
3607 suggestaddr.s6_addr16[0] = htons(0xfe80);
3608 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3609 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3610
3611 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3612 if (debug)
3613 log(-1, " [suggestaddr %s]",
3614 ip6_sprintf(&suggestaddr));
3615 #ifdef IPV6CP_MYIFID_DYN
3616 /*
3617 * When doing dynamic address assignment,
3618 * we accept his offer.
3619 */
3620 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3621 struct in6_addr lastsuggest;
3622 /*
3623 * If <suggested myaddr from peer> equals to
3624 * <hisaddr we have suggested last time>,
3625 * we have a collision. generate new random
3626 * ifid.
3627 */
3628 sppp_suggest_ip6_addr(&lastsuggest);
3629 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3630 lastsuggest)) {
3631 if (debug)
3632 log(-1, " [random]");
3633 sppp_gen_ip6_addr(sp, &suggestaddr);
3634 }
3635 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3636 if (debug)
3637 log(-1, " [agree]");
3638 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3639 }
3640 #else
3641 /*
3642 * Since we do not do dynamic address assignment,
3643 * we ignore it and thus continue to negotiate
3644 * our already existing value. This can possibly
3645 * go into infinite request-reject loop.
3646 *
3647 * This is not likely because we normally use
3648 * ifid based on MAC-address.
3649 * If you have no ethernet card on the node, too bad.
3650 * XXX should we use fail_counter?
3651 */
3652 #endif
3653 break;
3654 #ifdef notyet
3655 case IPV6CP_OPT_COMPRESS:
3656 /*
3657 * Peer wants different compression parameters.
3658 */
3659 break;
3660 #endif
3661 }
3662 }
3663 if (debug)
3664 log(-1, "\n");
3665 drop:
3666 kfree (buf, M_TEMP);
3667 return;
3668 }
3669 static void
3670 sppp_ipv6cp_tlu(struct sppp *sp)
3671 {
3672 /* we are up - notify isdn daemon */
3673 if (sp->pp_con)
3674 sp->pp_con(sp);
3675 }
3676
3677 static void
3678 sppp_ipv6cp_tld(struct sppp *sp)
3679 {
3680 }
3681
3682 static void
3683 sppp_ipv6cp_tls(struct sppp *sp)
3684 {
3685 /* indicate to LCP that it must stay alive */
3686 sp->lcp.protos |= (1 << IDX_IPV6CP);
3687 }
3688
3689 static void
3690 sppp_ipv6cp_tlf(struct sppp *sp)
3691 {
3692
3693 #if 0 /* need #if 0 to close IPv6CP properly */
3694 /* we no longer need LCP */
3695 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3696 sppp_lcp_check_and_close(sp);
3697 #endif
3698 }
3699
3700 static void
3701 sppp_ipv6cp_scr(struct sppp *sp)
3702 {
3703 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3704 struct in6_addr ouraddr;
3705 int i = 0;
3706
3707 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3708 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3709 opt[i++] = IPV6CP_OPT_IFID;
3710 opt[i++] = 10;
3711 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3712 i += 8;
3713 }
3714
3715 #ifdef notyet
3716 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3717 opt[i++] = IPV6CP_OPT_COMPRESSION;
3718 opt[i++] = 4;
3719 opt[i++] = 0; /* TBD */
3720 opt[i++] = 0; /* TBD */
3721 /* variable length data may follow */
3722 }
3723 #endif
3724
3725 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3726 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3727 }
3728 #else /*INET6*/
3729 static void
3730 sppp_ipv6cp_init(struct sppp *sp)
3731 {
3732 }
3733
3734 static void
3735 sppp_ipv6cp_up(struct sppp *sp)
3736 {
3737 }
3738
3739 static void
3740 sppp_ipv6cp_down(struct sppp *sp)
3741 {
3742 }
3743
3744
3745 static void
3746 sppp_ipv6cp_open(struct sppp *sp)
3747 {
3748 }
3749
3750 static void
3751 sppp_ipv6cp_close(struct sppp *sp)
3752 {
3753 }
3754
3755 static void
3756 sppp_ipv6cp_TO(void *sp)
3757 {
3758 }
3759
3760 static int
3761 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3762 {
3763 return 0;
3764 }
3765
3766 static void
3767 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3768 {
3769 }
3770
3771 static void
3772 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3773 {
3774 }
3775
3776 static void
3777 sppp_ipv6cp_tlu(struct sppp *sp)
3778 {
3779 }
3780
3781 static void
3782 sppp_ipv6cp_tld(struct sppp *sp)
3783 {
3784 }
3785
3786 static void
3787 sppp_ipv6cp_tls(struct sppp *sp)
3788 {
3789 }
3790
3791 static void
3792 sppp_ipv6cp_tlf(struct sppp *sp)
3793 {
3794 }
3795
3796 static void
3797 sppp_ipv6cp_scr(struct sppp *sp)
3798 {
3799 }
3800 #endif /*INET6*/
3801
3802 /*
3803 *--------------------------------------------------------------------------*
3804 * *
3805 * The CHAP implementation. *
3806 * *
3807 *--------------------------------------------------------------------------*
3808 */
3809
3810 /*
3811 * The authentication protocols don't employ a full-fledged state machine as
3812 * the control protocols do, since they do have Open and Close events, but
3813 * not Up and Down, nor are they explicitly terminated. Also, use of the
3814 * authentication protocols may be different in both directions (this makes
3815 * sense, think of a machine that never accepts incoming calls but only
3816 * calls out, it doesn't require the called party to authenticate itself).
3817 *
3818 * Our state machine for the local authentication protocol (we are requesting
3819 * the peer to authenticate) looks like:
3820 *
3821 * RCA-
3822 * +--------------------------------------------+
3823 * V scn,tld|
3824 * +--------+ Close +---------+ RCA+
3825 * | |<----------------------------------| |------+
3826 * +--->| Closed | TO* | Opened | sca |
3827 * | | |-----+ +-------| |<-----+
3828 * | +--------+ irc | | +---------+
3829 * | ^ | | ^
3830 * | | | | |
3831 * | | | | |
3832 * | TO-| | | |
3833 * | |tld TO+ V | |
3834 * | | +------->+ | |
3835 * | | | | | |
3836 * | +--------+ V | |
3837 * | | |<----+<--------------------+ |
3838 * | | Req- | scr |
3839 * | | Sent | |
3840 * | | | |
3841 * | +--------+ |
3842 * | RCA- | | RCA+ |
3843 * +------+ +------------------------------------------+
3844 * scn,tld sca,irc,ict,tlu
3845 *
3846 *
3847 * with:
3848 *
3849 * Open: LCP reached authentication phase
3850 * Close: LCP reached terminate phase
3851 *
3852 * RCA+: received reply (pap-req, chap-response), acceptable
3853 * RCN: received reply (pap-req, chap-response), not acceptable
3854 * TO+: timeout with restart counter >= 0
3855 * TO-: timeout with restart counter < 0
3856 * TO*: reschedule timeout for CHAP
3857 *
3858 * scr: send request packet (none for PAP, chap-challenge)
3859 * sca: send ack packet (pap-ack, chap-success)
3860 * scn: send nak packet (pap-nak, chap-failure)
3861 * ict: initialize re-challenge timer (CHAP only)
3862 *
3863 * tlu: this-layer-up, LCP reaches network phase
3864 * tld: this-layer-down, LCP enters terminate phase
3865 *
3866 * Note that in CHAP mode, after sending a new challenge, while the state
3867 * automaton falls back into Req-Sent state, it doesn't signal a tld
3868 * event to LCP, so LCP remains in network phase. Only after not getting
3869 * any response (or after getting an unacceptable response), CHAP closes,
3870 * causing LCP to enter terminate phase.
3871 *
3872 * With PAP, there is no initial request that can be sent. The peer is
3873 * expected to send one based on the successful negotiation of PAP as
3874 * the authentication protocol during the LCP option negotiation.
3875 *
3876 * Incoming authentication protocol requests (remote requests
3877 * authentication, we are peer) don't employ a state machine at all,
3878 * they are simply answered. Some peers [Ascend P50 firmware rev
3879 * 4.50] react allergically when sending IPCP requests while they are
3880 * still in authentication phase (thereby violating the standard that
3881 * demands that these NCP packets are to be discarded), so we keep
3882 * track of the peer demanding us to authenticate, and only proceed to
3883 * phase network once we've seen a positive acknowledge for the
3884 * authentication.
3885 */
3886
3887 /*
3888 * Handle incoming CHAP packets.
3889 */
3890 static void
3891 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3892 {
3893 STDDCL;
3894 struct lcp_header *h;
3895 int len;
3896 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3897 int value_len, name_len;
3898 MD5_CTX ctx;
3899
3900 len = m->m_pkthdr.len;
3901 if (len < 4) {
3902 if (debug)
3903 log(LOG_DEBUG,
3904 SPP_FMT "chap invalid packet length: %d bytes\n",
3905 SPP_ARGS(ifp), len);
3906 return;
3907 }
3908 h = mtod (m, struct lcp_header*);
3909 if (len > ntohs (h->len))
3910 len = ntohs (h->len);
3911
3912 switch (h->type) {
3913 /* challenge, failure and success are his authproto */
3914 case CHAP_CHALLENGE:
3915 value = 1 + (u_char*)(h+1);
3916 value_len = value[-1];
3917 name = value + value_len;
3918 name_len = len - value_len - 5;
3919 if (name_len < 0) {
3920 if (debug) {
3921 log(LOG_DEBUG,
3922 SPP_FMT "chap corrupted challenge "
3923 "<%s id=0x%x len=%d",
3924 SPP_ARGS(ifp),
3925 sppp_auth_type_name(PPP_CHAP, h->type),
3926 h->ident, ntohs(h->len));
3927 sppp_print_bytes((u_char*) (h+1), len-4);
3928 log(-1, ">\n");
3929 }
3930 break;
3931 }
3932
3933 if (debug) {
3934 log(LOG_DEBUG,
3935 SPP_FMT "chap input <%s id=0x%x len=%d name=",
3936 SPP_ARGS(ifp),
3937 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
3938 ntohs(h->len));
3939 sppp_print_string((char*) name, name_len);
3940 log(-1, " value-size=%d value=", value_len);
3941 sppp_print_bytes(value, value_len);
3942 log(-1, ">\n");
3943 }
3944
3945 /* Compute reply value. */
3946 MD5Init(&ctx);
3947 MD5Update(&ctx, &h->ident, 1);
3948 MD5Update(&ctx, sp->myauth.secret,
3949 strnlen(sp->myauth.secret, AUTHKEYLEN));
3950 MD5Update(&ctx, value, value_len);
3951 MD5Final(digest, &ctx);
3952 dsize = sizeof digest;
3953
3954 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
3955 sizeof dsize, (const char *)&dsize,
3956 sizeof digest, digest,
3957 (size_t)strnlen(sp->myauth.name, AUTHNAMELEN),
3958 sp->myauth.name,
3959 0);
3960 break;
3961
3962 case CHAP_SUCCESS:
3963 if (debug) {
3964 log(LOG_DEBUG, SPP_FMT "chap success",
3965 SPP_ARGS(ifp));
3966 if (len > 4) {
3967 log(-1, ": ");
3968 sppp_print_string((char*)(h + 1), len - 4);
3969 }
3970 log(-1, "\n");
3971 }
3972
3973 crit_enter();
3974
3975 sp->pp_flags &= ~PP_NEEDAUTH;
3976 if (sp->myauth.proto == PPP_CHAP &&
3977 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
3978 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
3979 /*
3980 * We are authenticator for CHAP but didn't
3981 * complete yet. Leave it to tlu to proceed
3982 * to network phase.
3983 */
3984 crit_exit();
3985 break;
3986 }
3987 crit_exit();
3988 sppp_phase_network(sp);
3989 break;
3990
3991 case CHAP_FAILURE:
3992 if (debug) {
3993 log(LOG_INFO, SPP_FMT "chap failure",
3994 SPP_ARGS(ifp));
3995 if (len > 4) {
3996 log(-1, ": ");
3997 sppp_print_string((char*)(h + 1), len - 4);
3998 }
3999 log(-1, "\n");
4000 } else
4001 log(LOG_INFO, SPP_FMT "chap failure\n",
4002 SPP_ARGS(ifp));
4003 /* await LCP shutdown by authenticator */
4004 break;
4005
4006 /* response is my authproto */
4007 case CHAP_RESPONSE:
4008 value = 1 + (u_char*)(h+1);
4009 value_len = value[-1];
4010 name = value + value_len;
4011 name_len = len - value_len - 5;
4012 if (name_len < 0) {
4013 if (debug) {
4014 log(LOG_DEBUG,
4015 SPP_FMT "chap corrupted response "
4016 "<%s id=0x%x len=%d",
4017 SPP_ARGS(ifp),
4018 sppp_auth_type_name(PPP_CHAP, h->type),
4019 h->ident, ntohs(h->len));
4020 sppp_print_bytes((u_char*)(h+1), len-4);
4021 log(-1, ">\n");
4022 }
4023 break;
4024 }
4025 if (h->ident != sp->confid[IDX_CHAP]) {
4026 if (debug)
4027 log(LOG_DEBUG,
4028 SPP_FMT "chap dropping response for old ID "
4029 "(got %d, expected %d)\n",
4030 SPP_ARGS(ifp),
4031 h->ident, sp->confid[IDX_CHAP]);
4032 break;
4033 }
4034 if (name_len != strnlen(sp->hisauth.name, AUTHNAMELEN)
4035 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4036 log(LOG_INFO, SPP_FMT "chap response, his name ",
4037 SPP_ARGS(ifp));
4038 sppp_print_string(name, name_len);
4039 log(-1, " != expected ");
4040 sppp_print_string(sp->hisauth.name,
4041 strnlen(sp->hisauth.name, AUTHNAMELEN));
4042 log(-1, "\n");
4043 }
4044 if (debug) {
4045 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4046 "<%s id=0x%x len=%d name=",
4047 SPP_ARGS(ifp),
4048 sppp_state_name(sp->state[IDX_CHAP]),
4049 sppp_auth_type_name(PPP_CHAP, h->type),
4050 h->ident, ntohs (h->len));
4051 sppp_print_string((char*)name, name_len);
4052 log(-1, " value-size=%d value=", value_len);
4053 sppp_print_bytes(value, value_len);
4054 log(-1, ">\n");
4055 }
4056 if (value_len != AUTHKEYLEN) {
4057 if (debug)
4058 log(LOG_DEBUG,
4059 SPP_FMT "chap bad hash value length: "
4060 "%d bytes, should be %d\n",
4061 SPP_ARGS(ifp), value_len,
4062 AUTHKEYLEN);
4063 break;
4064 }
4065
4066 MD5Init(&ctx);
4067 MD5Update(&ctx, &h->ident, 1);
4068 MD5Update(&ctx, sp->hisauth.secret,
4069 strnlen(sp->hisauth.secret, AUTHKEYLEN));
4070 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4071 MD5Final(digest, &ctx);
4072
4073 #define FAILMSG "Failed..."
4074 #define SUCCMSG "Welcome!"
4075
4076 if (value_len != sizeof digest ||
4077 bcmp(digest, value, value_len) != 0) {
4078 /* action scn, tld */
4079 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4080 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4081 0);
4082 chap.tld(sp);
4083 break;
4084 }
4085 /* action sca, perhaps tlu */
4086 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4087 sp->state[IDX_CHAP] == STATE_OPENED)
4088 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4089 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4090 0);
4091 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4092 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4093 chap.tlu(sp);
4094 }
4095 break;
4096
4097 default:
4098 /* Unknown CHAP packet type -- ignore. */
4099 if (debug) {
4100 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4101 "<0x%x id=0x%xh len=%d",
4102 SPP_ARGS(ifp),
4103 sppp_state_name(sp->state[IDX_CHAP]),
4104 h->type, h->ident, ntohs(h->len));
4105 sppp_print_bytes((u_char*)(h+1), len-4);
4106 log(-1, ">\n");
4107 }
4108 break;
4109
4110 }
4111 }
4112
4113 static void
4114 sppp_chap_init(struct sppp *sp)
4115 {
4116 /* Chap doesn't have STATE_INITIAL at all. */
4117 sp->state[IDX_CHAP] = STATE_CLOSED;
4118 sp->fail_counter[IDX_CHAP] = 0;
4119 sp->pp_seq[IDX_CHAP] = 0;
4120 sp->pp_rseq[IDX_CHAP] = 0;
4121 callout_init(&sp->timeout[IDX_CHAP]);
4122 }
4123
4124 static void
4125 sppp_chap_open(struct sppp *sp)
4126 {
4127 if (sp->myauth.proto == PPP_CHAP &&
4128 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4129 /* we are authenticator for CHAP, start it */
4130 chap.scr(sp);
4131 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4132 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4133 }
4134 /* nothing to be done if we are peer, await a challenge */
4135 }
4136
4137 static void
4138 sppp_chap_close(struct sppp *sp)
4139 {
4140 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4141 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4142 }
4143
4144 static void
4145 sppp_chap_TO(void *cookie)
4146 {
4147 struct sppp *sp = (struct sppp *)cookie;
4148 STDDCL;
4149
4150 crit_enter();
4151
4152 if (debug)
4153 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4154 SPP_ARGS(ifp),
4155 sppp_state_name(sp->state[IDX_CHAP]),
4156 sp->rst_counter[IDX_CHAP]);
4157
4158 if (--sp->rst_counter[IDX_CHAP] < 0)
4159 /* TO- event */
4160 switch (sp->state[IDX_CHAP]) {
4161 case STATE_REQ_SENT:
4162 chap.tld(sp);
4163 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4164 break;
4165 }
4166 else
4167 /* TO+ (or TO*) event */
4168 switch (sp->state[IDX_CHAP]) {
4169 case STATE_OPENED:
4170 /* TO* event */
4171 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4172 /* fall through */
4173 case STATE_REQ_SENT:
4174 chap.scr(sp);
4175 /* sppp_cp_change_state() will restart the timer */
4176 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4177 break;
4178 }
4179
4180 crit_exit();
4181 }
4182
4183 static void
4184 sppp_chap_tlu(struct sppp *sp)
4185 {
4186 STDDCL;
4187 int i;
4188
4189 i = 0;
4190 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4191
4192 /*
4193 * Some broken CHAP implementations (Conware CoNet, firmware
4194 * 4.0.?) don't want to re-authenticate their CHAP once the
4195 * initial challenge-response exchange has taken place.
4196 * Provide for an option to avoid rechallenges.
4197 */
4198 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4199 /*
4200 * Compute the re-challenge timeout. This will yield
4201 * a number between 300 and 810 seconds.
4202 */
4203 i = 300 + ((unsigned)(krandom() & 0xff00) >> 7);
4204 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4205 }
4206
4207 if (debug) {
4208 log(LOG_DEBUG,
4209 SPP_FMT "chap %s, ",
4210 SPP_ARGS(ifp),
4211 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4212 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4213 log(-1, "next re-challenge in %d seconds\n", i);
4214 else
4215 log(-1, "re-challenging suppressed\n");
4216 }
4217
4218 crit_enter();
4219
4220 /* indicate to LCP that we need to be closed down */
4221 sp->lcp.protos |= (1 << IDX_CHAP);
4222
4223 if (sp->pp_flags & PP_NEEDAUTH) {
4224 /*
4225 * Remote is authenticator, but his auth proto didn't
4226 * complete yet. Defer the transition to network
4227 * phase.
4228 */
4229 crit_exit();
4230 return;
4231 }
4232
4233 crit_exit();
4234
4235 /*
4236 * If we are already in phase network, we are done here. This
4237 * is the case if this is a dummy tlu event after a re-challenge.
4238 */
4239 if (sp->pp_phase != PHASE_NETWORK)
4240 sppp_phase_network(sp);
4241 }
4242
4243 static void
4244 sppp_chap_tld(struct sppp *sp)
4245 {
4246 STDDCL;
4247
4248 if (debug)
4249 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4250 callout_stop(&sp->timeout[IDX_CHAP]);
4251 sp->lcp.protos &= ~(1 << IDX_CHAP);
4252
4253 lcp.Close(sp);
4254 }
4255
4256 static void
4257 sppp_chap_scr(struct sppp *sp)
4258 {
4259 u_long *ch, seed;
4260 u_char clen;
4261
4262 /* Compute random challenge. */
4263 ch = (u_long *)sp->myauth.challenge;
4264 read_random(&seed, sizeof seed);
4265 ch[0] = seed ^ krandom();
4266 ch[1] = seed ^ krandom();
4267 ch[2] = seed ^ krandom();
4268 ch[3] = seed ^ krandom();
4269 clen = AUTHKEYLEN;
4270
4271 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4272
4273 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4274 sizeof clen, (const char *)&clen,
4275 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4276 (size_t)strnlen(sp->myauth.name, AUTHNAMELEN),
4277 sp->myauth.name,
4278 0);
4279 }
4280
4281 /*
4282 *--------------------------------------------------------------------------*
4283 * *
4284 * The PAP implementation. *
4285 * *
4286 *--------------------------------------------------------------------------*
4287 */
4288 /*
4289 * For PAP, we need to keep a little state also if we are the peer, not the
4290 * authenticator. This is since we don't get a request to authenticate, but
4291 * have to repeatedly authenticate ourself until we got a response (or the
4292 * retry counter is expired).
4293 */
4294
4295 /*
4296 * Handle incoming PAP packets. */
4297 static void
4298 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4299 {
4300 STDDCL;
4301 struct lcp_header *h;
4302 int len;
4303 u_char *name, *passwd, mlen;
4304 int name_len, passwd_len;
4305
4306 /*
4307 * Malicious input might leave this uninitialized, so
4308 * init to an impossible value.
4309 */
4310 passwd_len = -1;
4311
4312 len = m->m_pkthdr.len;
4313 if (len < 5) {
4314 if (debug)
4315 log(LOG_DEBUG,
4316 SPP_FMT "pap invalid packet length: %d bytes\n",
4317 SPP_ARGS(ifp), len);
4318 return;
4319 }
4320 h = mtod (m, struct lcp_header*);
4321 if (len > ntohs (h->len))
4322 len = ntohs (h->len);
4323 switch (h->type) {
4324 /* PAP request is my authproto */
4325 case PAP_REQ:
4326 name = 1 + (u_char*)(h+1);
4327 name_len = name[-1];
4328 passwd = name + name_len + 1;
4329 if (name_len > len - 6 ||
4330 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4331 if (debug) {
4332 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4333 "<%s id=0x%x len=%d",
4334 SPP_ARGS(ifp),
4335 sppp_auth_type_name(PPP_PAP, h->type),
4336 h->ident, ntohs(h->len));
4337 sppp_print_bytes((u_char*)(h+1), len-4);
4338 log(-1, ">\n");
4339 }
4340 break;
4341 }
4342 if (debug) {
4343 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4344 "<%s id=0x%x len=%d name=",
4345 SPP_ARGS(ifp),
4346 sppp_state_name(sp->state[IDX_PAP]),
4347 sppp_auth_type_name(PPP_PAP, h->type),
4348 h->ident, ntohs(h->len));
4349 sppp_print_string((char*)name, name_len);
4350 log(-1, " passwd=");
4351 sppp_print_string((char*)passwd, passwd_len);
4352 log(-1, ">\n");
4353 }
4354 if (name_len != strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4355 passwd_len != strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4356 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4357 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4358 /* action scn, tld */
4359 mlen = sizeof(FAILMSG) - 1;
4360 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4361 sizeof mlen, (const char *)&mlen,
4362 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4363 0);
4364 pap.tld(sp);
4365 break;
4366 }
4367 /* action sca, perhaps tlu */
4368 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4369 sp->state[IDX_PAP] == STATE_OPENED) {
4370 mlen = sizeof(SUCCMSG) - 1;
4371 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4372 sizeof mlen, (const char *)&mlen,
4373 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4374 0);
4375 }
4376 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4377 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4378 pap.tlu(sp);
4379 }
4380 break;
4381
4382 /* ack and nak are his authproto */
4383 case PAP_ACK:
4384 callout_stop(&sp->pap_my_to);
4385 if (debug) {
4386 log(LOG_DEBUG, SPP_FMT "pap success",
4387 SPP_ARGS(ifp));
4388 name = 1 + (u_char *)(h + 1);
4389 name_len = name[-1];
4390 if (len > 5 && name_len < len+4) {
4391 log(-1, ": ");
4392 sppp_print_string(name, name_len);
4393 }
4394 log(-1, "\n");
4395 }
4396
4397 crit_enter();
4398
4399 sp->pp_flags &= ~PP_NEEDAUTH;
4400 if (sp->myauth.proto == PPP_PAP &&
4401 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4402 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4403 /*
4404 * We are authenticator for PAP but didn't
4405 * complete yet. Leave it to tlu to proceed
4406 * to network phase.
4407 */
4408
4409 crit_exit();
4410
4411 break;
4412 }
4413
4414 crit_exit();
4415
4416 sppp_phase_network(sp);
4417 break;
4418
4419 case PAP_NAK:
4420 callout_stop(&sp->pap_my_to);
4421 if (debug) {
4422 log(LOG_INFO, SPP_FMT "pap failure",
4423 SPP_ARGS(ifp));
4424 name = 1 + (u_char *)(h + 1);
4425 name_len = name[-1];
4426 if (len > 5 && name_len < len+4) {
4427 log(-1, ": ");
4428 sppp_print_string(name, name_len);
4429 }
4430 log(-1, "\n");
4431 } else
4432 log(LOG_INFO, SPP_FMT "pap failure\n",
4433 SPP_ARGS(ifp));
4434 /* await LCP shutdown by authenticator */
4435 break;
4436
4437 default:
4438 /* Unknown PAP packet type -- ignore. */
4439 if (debug) {
4440 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4441 "<0x%x id=0x%x len=%d",
4442 SPP_ARGS(ifp),
4443 h->type, h->ident, ntohs(h->len));
4444 sppp_print_bytes((u_char*)(h+1), len-4);
4445 log(-1, ">\n");
4446 }
4447 break;
4448
4449 }
4450 }
4451
4452 static void
4453 sppp_pap_init(struct sppp *sp)
4454 {
4455 /* PAP doesn't have STATE_INITIAL at all. */
4456 sp->state[IDX_PAP] = STATE_CLOSED;
4457 sp->fail_counter[IDX_PAP] = 0;
4458 sp->pp_seq[IDX_PAP] = 0;
4459 sp->pp_rseq[IDX_PAP] = 0;
4460 callout_init(&sp->timeout[IDX_PAP]);
4461 callout_init(&sp->pap_my_to);
4462 }
4463
4464 static void
4465 sppp_pap_open(struct sppp *sp)
4466 {
4467 if (sp->hisauth.proto == PPP_PAP &&
4468 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4469 /* we are authenticator for PAP, start our timer */
4470 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4471 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4472 }
4473 if (sp->myauth.proto == PPP_PAP) {
4474 /* we are peer, send a request, and start a timer */
4475 pap.scr(sp);
4476 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4477 sppp_pap_my_TO, sp);
4478 }
4479 }
4480
4481 static void
4482 sppp_pap_close(struct sppp *sp)
4483 {
4484 if (sp->state[IDX_PAP] != STATE_CLOSED)
4485 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4486 }
4487
4488 /*
4489 * That's the timeout routine if we are authenticator. Since the
4490 * authenticator is basically passive in PAP, we can't do much here.
4491 */
4492 static void
4493 sppp_pap_TO(void *cookie)
4494 {
4495 struct sppp *sp = (struct sppp *)cookie;
4496 STDDCL;
4497
4498 crit_enter();
4499
4500 if (debug)
4501 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4502 SPP_ARGS(ifp),
4503 sppp_state_name(sp->state[IDX_PAP]),
4504 sp->rst_counter[IDX_PAP]);
4505
4506 if (--sp->rst_counter[IDX_PAP] < 0)
4507 /* TO- event */
4508 switch (sp->state[IDX_PAP]) {
4509 case STATE_REQ_SENT:
4510 pap.tld(sp);
4511 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4512 break;
4513 }
4514 else
4515 /* TO+ event, not very much we could do */
4516 switch (sp->state[IDX_PAP]) {
4517 case STATE_REQ_SENT:
4518 /* sppp_cp_change_state() will restart the timer */
4519 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4520 break;
4521 }
4522
4523 crit_exit();
4524 }
4525
4526 /*
4527 * That's the timeout handler if we are peer. Since the peer is active,
4528 * we need to retransmit our PAP request since it is apparently lost.
4529 * XXX We should impose a max counter.
4530 */
4531 static void
4532 sppp_pap_my_TO(void *cookie)
4533 {
4534 struct sppp *sp = (struct sppp *)cookie;
4535 STDDCL;
4536
4537 if (debug)
4538 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4539 SPP_ARGS(ifp));
4540
4541 pap.scr(sp);
4542 }
4543
4544 static void
4545 sppp_pap_tlu(struct sppp *sp)
4546 {
4547 STDDCL;
4548
4549 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4550
4551 if (debug)
4552 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4553 SPP_ARGS(ifp), pap.name);
4554
4555 crit_enter();
4556
4557 /* indicate to LCP that we need to be closed down */
4558 sp->lcp.protos |= (1 << IDX_PAP);
4559
4560 if (sp->pp_flags & PP_NEEDAUTH) {
4561 /*
4562 * Remote is authenticator, but his auth proto didn't
4563 * complete yet. Defer the transition to network
4564 * phase.
4565 */
4566 crit_exit();
4567 return;
4568 }
4569 crit_exit();
4570 sppp_phase_network(sp);
4571 }
4572
4573 static void
4574 sppp_pap_tld(struct sppp *sp)
4575 {
4576 STDDCL;
4577
4578 if (debug)
4579 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4580 callout_stop(&sp->timeout[IDX_PAP]);
4581 callout_stop(&sp->pap_my_to);
4582 sp->lcp.protos &= ~(1 << IDX_PAP);
4583
4584 lcp.Close(sp);
4585 }
4586
4587 static void
4588 sppp_pap_scr(struct sppp *sp)
4589 {
4590 u_char idlen, pwdlen;
4591
4592 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4593 pwdlen = strnlen(sp->myauth.secret, AUTHKEYLEN);
4594 idlen = strnlen(sp->myauth.name, AUTHNAMELEN);
4595
4596 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4597 sizeof idlen, (const char *)&idlen,
4598 (size_t)idlen, sp->myauth.name,
4599 sizeof pwdlen, (const char *)&pwdlen,
4600 (size_t)pwdlen, sp->myauth.secret,
4601 0);
4602 }
4603
4604 /*
4605 * Random miscellaneous functions.
4606 */
4607
4608 /*
4609 * Send a PAP or CHAP proto packet.
4610 *
4611 * Varadic function, each of the elements for the ellipsis is of type
4612 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4613 * mlen == 0.
4614 * NOTE: never declare variadic functions with types subject to type
4615 * promotion (i.e. u_char). This is asking for big trouble depending
4616 * on the architecture you are on...
4617 */
4618
4619 static void
4620 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4621 unsigned int type, unsigned int id,
4622 ...)
4623 {
4624 STDDCL;
4625 struct ppp_header *h;
4626 struct lcp_header *lh;
4627 struct mbuf *m;
4628 u_char *p;
4629 int len;
4630 unsigned int mlen;
4631 const char *msg;
4632 struct ifaltq_subque *ifsq;
4633 __va_list ap;
4634
4635 MGETHDR (m, M_NOWAIT, MT_DATA);
4636 if (! m)
4637 return;
4638 m->m_pkthdr.rcvif = 0;
4639
4640 h = mtod (m, struct ppp_header*);
4641 h->address = PPP_ALLSTATIONS; /* broadcast address */
4642 h->control = PPP_UI; /* Unnumbered Info */
4643 h->protocol = htons(cp->proto);
4644
4645 lh = (struct lcp_header*)(h + 1);
4646 lh->type = type;
4647 lh->ident = id;
4648 p = (u_char*) (lh+1);
4649
4650 __va_start(ap, id);
4651 len = 0;
4652
4653 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4654 msg = __va_arg(ap, const char *);
4655 len += mlen;
4656 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4657 __va_end(ap);
4658 m_freem(m);
4659 return;
4660 }
4661
4662 bcopy(msg, p, mlen);
4663 p += mlen;
4664 }
4665 __va_end(ap);
4666
4667 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4668 lh->len = htons (LCP_HEADER_LEN + len);
4669
4670 if (debug) {
4671 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4672 SPP_ARGS(ifp), cp->name,
4673 sppp_auth_type_name(cp->proto, lh->type),
4674 lh->ident, ntohs(lh->len));
4675 sppp_print_bytes((u_char*) (lh+1), len);
4676 log(-1, ">\n");
4677 }
4678 if (IF_QFULL (&sp->pp_cpq)) {
4679 IF_DROP (&sp->pp_fastq);
4680 m_freem (m);
4681 IFNET_STAT_INC(ifp, oerrors, 1);
4682 } else
4683 IF_ENQUEUE (&sp->pp_cpq, m);
4684 ifsq = ifq_get_subq_default(&ifp->if_snd);
4685 if (!ifsq_is_oactive(ifsq))
4686 (*ifp->if_start) (ifp, ifsq);
4687 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + 3);
4688 }
4689
4690 /*
4691 * Send keepalive packets, every 10 seconds.
4692 */
4693 static void
4694 sppp_keepalive(void *dummy)
4695 {
4696 struct sppp *sp;
4697
4698 crit_enter();
4699
4700 for (sp=spppq; sp; sp=sp->pp_next) {
4701 struct ifnet *ifp = &sp->pp_if;
4702
4703 /* Keepalive mode disabled or channel down? */
4704 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4705 ! (ifp->if_flags & IFF_RUNNING))
4706 continue;
4707
4708 /* No keepalive in PPP mode if LCP not opened yet. */
4709 if (sp->pp_mode != IFF_CISCO &&
4710 sp->pp_phase < PHASE_AUTHENTICATE)
4711 continue;
4712
4713 if (sp->pp_alivecnt == MAXALIVECNT) {
4714 /* No keepalive packets got. Stop the interface. */
4715 kprintf (SPP_FMT "down\n", SPP_ARGS(ifp));
4716 if_down (ifp);
4717 IF_DRAIN(&sp->pp_cpq);
4718 if (sp->pp_mode != IFF_CISCO) {
4719 /* XXX */
4720 /* Shut down the PPP link. */
4721 lcp.Down(sp);
4722 /* Initiate negotiation. XXX */
4723 lcp.Up(sp);
4724 }
4725 }
4726 ifnet_serialize_all(ifp);
4727 if (sp->pp_alivecnt <= MAXALIVECNT)
4728 ++sp->pp_alivecnt;
4729 if (sp->pp_mode == IFF_CISCO)
4730 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4731 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4732 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4733 long nmagic = htonl (sp->lcp.magic);
4734 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4735 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4736 sp->lcp.echoid, 4, &nmagic);
4737 }
4738 ifnet_deserialize_all(ifp);
4739 }
4740 callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4741 crit_exit();
4742 }
4743
4744 /*
4745 * Get both IP addresses.
4746 */
4747 static void
4748 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4749 {
4750 struct ifnet *ifp = &sp->pp_if;
4751 struct ifaddr_container *ifac;
4752 struct ifaddr *ifa;
4753 struct sockaddr_in *si, *sm;
4754 u_long ssrc, ddst;
4755
4756 sm = NULL;
4757 ssrc = ddst = 0L;
4758 /*
4759 * Pick the first AF_INET address from the list,
4760 * aliases don't make any sense on a p2p link anyway.
4761 */
4762 si = NULL;
4763 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4764 ifa = ifac->ifa;
4765 if (ifa->ifa_addr->sa_family == AF_INET) {
4766 si = (struct sockaddr_in *)ifa->ifa_addr;
4767 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4768 if (si)
4769 break;
4770 }
4771 }
4772 if (ifac != NULL) {
4773 if (si && si->sin_addr.s_addr) {
4774 ssrc = si->sin_addr.s_addr;
4775 if (srcmask)
4776 *srcmask = ntohl(sm->sin_addr.s_addr);
4777 }
4778
4779 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4780 if (si && si->sin_addr.s_addr)
4781 ddst = si->sin_addr.s_addr;
4782 }
4783
4784 if (dst) *dst = ntohl(ddst);
4785 if (src) *src = ntohl(ssrc);
4786 }
4787
4788 /*
4789 * Set my IP address. Must be called at splimp.
4790 */
4791 static void
4792 sppp_set_ip_addr(struct sppp *sp, u_long src)
4793 {
4794 STDDCL;
4795 struct ifaddr_container *ifac;
4796 struct ifaddr *ifa = NULL;
4797 struct sockaddr_in *si;
4798 struct in_ifaddr *ia;
4799
4800 /*
4801 * Pick the first AF_INET address from the list,
4802 * aliases don't make any sense on a p2p link anyway.
4803 */
4804 si = NULL;
4805 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4806 ifa = ifac->ifa;
4807 if (ifa->ifa_addr->sa_family == AF_INET) {
4808 si = (struct sockaddr_in *)ifa->ifa_addr;
4809 if (si)
4810 break;
4811 }
4812 }
4813
4814 if (ifac != NULL && si != NULL) {
4815 int error;
4816
4817 /* delete old route */
4818 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4819 if(debug && error)
4820 {
4821 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4822 SPP_ARGS(ifp), error);
4823 }
4824
4825 ia = ifatoia(ifa);
4826 in_iahash_remove(ia);
4827
4828 /* set new address */
4829 si->sin_addr.s_addr = htonl(src);
4830 in_iahash_insert(ia);
4831
4832 /* add new route */
4833 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4834 if (debug && error)
4835 {
4836 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4837 SPP_ARGS(ifp), error);
4838 }
4839 }
4840 }
4841
4842 #ifdef INET6
4843 /*
4844 * Get both IPv6 addresses.
4845 */
4846 static void
4847 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4848 struct in6_addr *srcmask)
4849 {
4850 struct ifnet *ifp = &sp->pp_if;
4851 struct ifaddr_container *ifac;
4852 struct ifaddr *ifa;
4853 struct sockaddr_in6 *si, *sm;
4854 struct in6_addr ssrc, ddst;
4855
4856 sm = NULL;
4857 bzero(&ssrc, sizeof(ssrc));
4858 bzero(&ddst, sizeof(ddst));
4859 /*
4860 * Pick the first link-local AF_INET6 address from the list,
4861 * aliases don't make any sense on a p2p link anyway.
4862 */
4863 si = NULL;
4864 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4865 ifa = ifac->ifa;
4866 if (ifa->ifa_addr->sa_family == AF_INET6) {
4867 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4868 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4869 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4870 break;
4871 }
4872 }
4873 if (ifac != NULL) {
4874 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4875 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4876 if (srcmask) {
4877 bcopy(&sm->sin6_addr, srcmask,
4878 sizeof(*srcmask));
4879 }
4880 }
4881
4882 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4883 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4884 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4885 }
4886
4887 if (dst)
4888 bcopy(&ddst, dst, sizeof(*dst));
4889 if (src)
4890 bcopy(&ssrc, src, sizeof(*src));
4891 }
4892
4893 #ifdef IPV6CP_MYIFID_DYN
4894 /*
4895 * Generate random ifid.
4896 */
4897 static void
4898 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4899 {
4900 /* TBD */
4901 }
4902
4903 /*
4904 * Set my IPv6 address. Must be called at splimp.
4905 */
4906 static void
4907 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4908 {
4909 STDDCL;
4910 struct ifaddr_container *ifac;
4911 struct ifaddr *ifa;
4912 struct sockaddr_in6 *sin6;
4913
4914 /*
4915 * Pick the first link-local AF_INET6 address from the list,
4916 * aliases don't make any sense on a p2p link anyway.
4917 */
4918
4919 sin6 = NULL;
4920 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4921 ifa = ifac->ifa;
4922 if (ifa->ifa_addr->sa_family == AF_INET6) {
4923 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4924 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
4925 break;
4926 }
4927 }
4928
4929 if (ifac != NULL && sin6 != NULL) {
4930 int error;
4931 struct sockaddr_in6 new_sin6 = *sin6;
4932
4933 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
4934 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
4935 if (debug && error) {
4936 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
4937 " failed, error=%d\n", SPP_ARGS(ifp), error);
4938 }
4939 }
4940 }
4941 #endif
4942
4943 /*
4944 * Suggest a candidate address to be used by peer.
4945 */
4946 static void
4947 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
4948 {
4949 struct in6_addr myaddr;
4950 struct timeval tv;
4951
4952 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
4953
4954 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
4955 microtime(&tv);
4956 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
4957 myaddr.s6_addr[14] ^= 0xff;
4958 myaddr.s6_addr[15] ^= 0xff;
4959 } else {
4960 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
4961 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
4962 }
4963 if (suggest)
4964 bcopy(&myaddr, suggest, sizeof(myaddr));
4965 }
4966 #endif /*INET6*/
4967
4968 static int
4969 sppp_params(struct sppp *sp, u_long cmd, void *data)
4970 {
4971 u_long subcmd;
4972 struct ifreq *ifr = (struct ifreq *)data;
4973 struct spppreq *spr;
4974 int rv = 0;
4975
4976 spr = kmalloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
4977
4978 /*
4979 * ifr->ifr_data is supposed to point to a struct spppreq.
4980 * Check the cmd word first before attempting to fetch all the
4981 * data.
4982 */
4983 if ((subcmd = fuword(ifr->ifr_data)) == -1) {
4984 rv = EFAULT;
4985 goto quit;
4986 }
4987
4988 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
4989 rv = EFAULT;
4990 goto quit;
4991 }
4992
4993 switch (subcmd) {
4994 case (u_long)SPPPIOGDEFS:
4995 if (cmd != SIOCGIFGENERIC) {
4996 rv = EINVAL;
4997 break;
4998 }
4999 /*
5000 * We copy over the entire current state, but clean
5001 * out some of the stuff we don't wanna pass up.
5002 * Remember, SIOCGIFGENERIC is unprotected, and can be
5003 * called by any user. No need to ever get PAP or
5004 * CHAP secrets back to userland anyway.
5005 */
5006 spr->defs.pp_phase = sp->pp_phase;
5007 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5008 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5009 spr->defs.lcp = sp->lcp;
5010 spr->defs.ipcp = sp->ipcp;
5011 spr->defs.ipv6cp = sp->ipv6cp;
5012 spr->defs.myauth = sp->myauth;
5013 spr->defs.hisauth = sp->hisauth;
5014 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5015 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5016 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5017 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5018 /*
5019 * Fixup the LCP timeout value to milliseconds so
5020 * spppcontrol doesn't need to bother about the value
5021 * of "hz". We do the reverse calculation below when
5022 * setting it.
5023 */
5024 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5025 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5026 sizeof(struct spppreq));
5027 break;
5028
5029 case (u_long)SPPPIOSDEFS:
5030 if (cmd != SIOCSIFGENERIC) {
5031 rv = EINVAL;
5032 break;
5033 }
5034 /*
5035 * We have a very specific idea of which fields we
5036 * allow being passed back from userland, so to not
5037 * clobber our current state. For one, we only allow
5038 * setting anything if LCP is in dead or establish
5039 * phase. Once the authentication negotiations
5040 * started, the authentication settings must not be
5041 * changed again. (The administrator can force an
5042 * ifconfig down in order to get LCP back into dead
5043 * phase.)
5044 *
5045 * Also, we only allow for authentication parameters to be
5046 * specified.
5047 *
5048 * XXX Should allow to set or clear pp_flags.
5049 *
5050 * Finally, if the respective authentication protocol to
5051 * be used is set differently than 0, but the secret is
5052 * passed as all zeros, we don't trash the existing secret.
5053 * This allows an administrator to change the system name
5054 * only without clobbering the secret (which he didn't get
5055 * back in a previous SPPPIOGDEFS call). However, the
5056 * secrets are cleared if the authentication protocol is
5057 * reset to 0. */
5058 if (sp->pp_phase != PHASE_DEAD &&
5059 sp->pp_phase != PHASE_ESTABLISH) {
5060 rv = EBUSY;
5061 break;
5062 }
5063
5064 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5065 spr->defs.myauth.proto != PPP_CHAP) ||
5066 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5067 spr->defs.hisauth.proto != PPP_CHAP)) {
5068 rv = EINVAL;
5069 break;
5070 }
5071
5072 if (spr->defs.myauth.proto == 0)
5073 /* resetting myauth */
5074 bzero(&sp->myauth, sizeof sp->myauth);
5075 else {
5076 /* setting/changing myauth */
5077 sp->myauth.proto = spr->defs.myauth.proto;
5078 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5079 if (spr->defs.myauth.secret[0] != '\0')
5080 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5081 AUTHKEYLEN);
5082 }
5083 if (spr->defs.hisauth.proto == 0)
5084 /* resetting hisauth */
5085 bzero(&sp->hisauth, sizeof sp->hisauth);
5086 else {
5087 /* setting/changing hisauth */
5088 sp->hisauth.proto = spr->defs.hisauth.proto;
5089 sp->hisauth.flags = spr->defs.hisauth.flags;
5090 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5091 if (spr->defs.hisauth.secret[0] != '\0')
5092 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5093 AUTHKEYLEN);
5094 }
5095 /* set LCP restart timer timeout */
5096 if (spr->defs.lcp.timeout != 0)
5097 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5098 /* set VJ enable and IPv6 disable flags */
5099 #ifdef INET
5100 if (spr->defs.enable_vj)
5101 sp->confflags |= CONF_ENABLE_VJ;
5102 else
5103 sp->confflags &= ~CONF_ENABLE_VJ;
5104 #endif
5105 #ifdef INET6
5106 if (spr->defs.enable_ipv6)
5107 sp->confflags |= CONF_ENABLE_IPV6;
5108 else
5109 sp->confflags &= ~CONF_ENABLE_IPV6;
5110 #endif
5111 break;
5112
5113 default:
5114 rv = EINVAL;
5115 }
5116
5117 quit:
5118 kfree(spr, M_TEMP);
5119
5120 return (rv);
5121 }
5122
5123 static void
5124 sppp_phase_network(struct sppp *sp)
5125 {
5126 STDDCL;
5127 int i;
5128 u_long mask;
5129
5130 sp->pp_phase = PHASE_NETWORK;
5131
5132 if (debug)
5133 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5134 sppp_phase_name(sp->pp_phase));
5135
5136 /* Notify NCPs now. */
5137 for (i = 0; i < IDX_COUNT; i++)
5138 if ((cps[i])->flags & CP_NCP)
5139 (cps[i])->Open(sp);
5140
5141 /* Send Up events to all NCPs. */
5142 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5143 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5144 (cps[i])->Up(sp);
5145
5146 /* if no NCP is starting, all this was in vain, close down */
5147 sppp_lcp_check_and_close(sp);
5148 }
5149
5150
5151 static const char *
5152 sppp_cp_type_name(u_char type)
5153 {
5154 static char buf[12];
5155 switch (type) {
5156 case CONF_REQ: return "conf-req";
5157 case CONF_ACK: return "conf-ack";
5158 case CONF_NAK: return "conf-nak";
5159 case CONF_REJ: return "conf-rej";
5160 case TERM_REQ: return "term-req";
5161 case TERM_ACK: return "term-ack";
5162 case CODE_REJ: return "code-rej";
5163 case PROTO_REJ: return "proto-rej";
5164 case ECHO_REQ: return "echo-req";
5165 case ECHO_REPLY: return "echo-reply";
5166 case DISC_REQ: return "discard-req";
5167 }
5168 ksnprintf (buf, sizeof(buf), "cp/0x%x", type);
5169 return buf;
5170 }
5171
5172 static const char *
5173 sppp_auth_type_name(u_short proto, u_char type)
5174 {
5175 static char buf[12];
5176 switch (proto) {
5177 case PPP_CHAP:
5178 switch (type) {
5179 case CHAP_CHALLENGE: return "challenge";
5180 case CHAP_RESPONSE: return "response";
5181 case CHAP_SUCCESS: return "success";
5182 case CHAP_FAILURE: return "failure";
5183 }
5184 case PPP_PAP:
5185 switch (type) {
5186 case PAP_REQ: return "req";
5187 case PAP_ACK: return "ack";
5188 case PAP_NAK: return "nak";
5189 }
5190 }
5191 ksnprintf (buf, sizeof(buf), "auth/0x%x", type);
5192 return buf;
5193 }
5194
5195 static const char *
5196 sppp_lcp_opt_name(u_char opt)
5197 {
5198 static char buf[12];
5199 switch (opt) {
5200 case LCP_OPT_MRU: return "mru";
5201 case LCP_OPT_ASYNC_MAP: return "async-map";
5202 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5203 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5204 case LCP_OPT_MAGIC: return "magic";
5205 case LCP_OPT_PROTO_COMP: return "proto-comp";
5206 case LCP_OPT_ADDR_COMP: return "addr-comp";
5207 }
5208 ksnprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5209 return buf;
5210 }
5211
5212 static const char *
5213 sppp_ipcp_opt_name(u_char opt)
5214 {
5215 static char buf[12];
5216 switch (opt) {
5217 case IPCP_OPT_ADDRESSES: return "addresses";
5218 case IPCP_OPT_COMPRESSION: return "compression";
5219 case IPCP_OPT_ADDRESS: return "address";
5220 }
5221 ksnprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5222 return buf;
5223 }
5224
5225 #ifdef INET6
5226 static const char *
5227 sppp_ipv6cp_opt_name(u_char opt)
5228 {
5229 static char buf[12];
5230 switch (opt) {
5231 case IPV6CP_OPT_IFID: return "ifid";
5232 case IPV6CP_OPT_COMPRESSION: return "compression";
5233 }
5234 ksprintf (buf, "0x%x", opt);
5235 return buf;
5236 }
5237 #endif
5238
5239 static const char *
5240 sppp_state_name(int state)
5241 {
5242 switch (state) {
5243 case STATE_INITIAL: return "initial";
5244 case STATE_STARTING: return "starting";
5245 case STATE_CLOSED: return "closed";
5246 case STATE_STOPPED: return "stopped";
5247 case STATE_CLOSING: return "closing";
5248 case STATE_STOPPING: return "stopping";
5249 case STATE_REQ_SENT: return "req-sent";
5250 case STATE_ACK_RCVD: return "ack-rcvd";
5251 case STATE_ACK_SENT: return "ack-sent";
5252 case STATE_OPENED: return "opened";
5253 }
5254 return "illegal";
5255 }
5256
5257 static const char *
5258 sppp_phase_name(enum ppp_phase phase)
5259 {
5260 switch (phase) {
5261 case PHASE_DEAD: return "dead";
5262 case PHASE_ESTABLISH: return "establish";
5263 case PHASE_TERMINATE: return "terminate";
5264 case PHASE_AUTHENTICATE: return "authenticate";
5265 case PHASE_NETWORK: return "network";
5266 }
5267 return "illegal";
5268 }
5269
5270 static const char *
5271 sppp_proto_name(u_short proto)
5272 {
5273 static char buf[12];
5274 switch (proto) {
5275 case PPP_LCP: return "lcp";
5276 case PPP_IPCP: return "ipcp";
5277 case PPP_PAP: return "pap";
5278 case PPP_CHAP: return "chap";
5279 case PPP_IPV6CP: return "ipv6cp";
5280 }
5281 ksnprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5282 return buf;
5283 }
5284
5285 static void
5286 sppp_print_bytes(const u_char *p, u_short len)
5287 {
5288 char hexstr[len];
5289 if (len)
5290 log(-1, " %s", hexncpy(p, len, hexstr, HEX_NCPYLEN(len), "-"));
5291 }
5292
5293 static void
5294 sppp_print_string(const char *p, u_short len)
5295 {
5296 u_char c;
5297
5298 while (len-- > 0) {
5299 c = *p++;
5300 /*
5301 * Print only ASCII chars directly. RFC 1994 recommends
5302 * using only them, but we don't rely on it. */
5303 if (c < ' ' || c > '~')
5304 log(-1, "\\x%x", c);
5305 else
5306 log(-1, "%c", c);
5307 }
5308 }
5309
5310 static const char *
5311 sppp_dotted_quad(u_long addr)
5312 {
5313 static char s[16];
5314 ksprintf(s, "%d.%d.%d.%d",
5315 (int)((addr >> 24) & 0xff),
5316 (int)((addr >> 16) & 0xff),
5317 (int)((addr >> 8) & 0xff),
5318 (int)(addr & 0xff));
5319 return s;
5320 }
5321
5322 /* a dummy, used to drop uninteresting events */
5323 static void
5324 sppp_null(struct sppp *unused)
5325 {
5326 /* do just nothing */
5327 }
DragonFly BSD