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sppp_output() is installed in ifnet.if_output and is only called through that
[dragonfly.git] / sys / net / sppp / if_spppsubr.c
blob6664996a09f8b583fb93c42087eed99e7ca0a6ff
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 * $DragonFly: src/sys/net/sppp/if_spppsubr.c,v 1.32 2008/04/05 05:57:07 sephe Exp $
22 */
23
24 #include <sys/param.h>
25
26 #if defined(__DragonFly__)
27 #include "opt_inet.h"
28 #include "opt_inet6.h"
29 #include "opt_ipx.h"
30 #endif
31
32 #ifdef NetBSD1_3
33 # if NetBSD1_3 > 6
34 # include "opt_inet.h"
35 # include "opt_inet6.h"
36 # include "opt_iso.h"
37 # endif
38 #endif
39
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/sockio.h>
44 #include <sys/socket.h>
45 #include <sys/syslog.h>
46 #if defined(__DragonFly__)
47 #include <sys/random.h>
48 #include <sys/thread2.h>
49 #endif
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52
53 #if defined (__OpenBSD__)
54 #include <sys/md5k.h>
55 #else
56 #include <sys/md5.h>
57 #endif
58
59 #include <net/if.h>
60 #include <net/ifq_var.h>
61 #include <net/netisr.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/ip.h>
67 #include <net/slcompress.h>
68
69 #if defined (__NetBSD__) || defined (__OpenBSD__)
70 #include <machine/cpu.h> /* XXX for softnet */
71 #endif
72
73 #include <machine/stdarg.h>
74
75 #include <netinet/in.h>
76 #include <netinet/in_systm.h>
77 #include <netinet/in_var.h>
78
79 #ifdef INET
80 #include <netinet/ip.h>
81 #include <netinet/tcp.h>
82 #endif
83
84 #if defined (__DragonFly__) || defined (__OpenBSD__)
85 # include <netinet/if_ether.h>
86 #else
87 # include <net/ethertypes.h>
88 #endif
89
90 #ifdef IPX
91 #include <netproto/ipx/ipx.h>
92 #include <netproto/ipx/ipx_if.h>
93 #endif
94
95 #ifdef NS
96 #include <netns/ns.h>
97 #include <netns/ns_if.h>
98 #endif
99
100 #include "if_sppp.h"
101
102 #define IOCTL_CMD_T u_long
103 #define MAXALIVECNT 3 /* max. alive packets */
104
105 /*
106 * Interface flags that can be set in an ifconfig command.
107 *
108 * Setting link0 will make the link passive, i.e. it will be marked
109 * as being administrative openable, but won't be opened to begin
110 * with. Incoming calls will be answered, or subsequent calls with
111 * -link1 will cause the administrative open of the LCP layer.
112 *
113 * Setting link1 will cause the link to auto-dial only as packets
114 * arrive to be sent.
115 *
116 * Setting IFF_DEBUG will syslog the option negotiation and state
117 * transitions at level kern.debug. Note: all logs consistently look
118 * like
119 *
120 * <if-name><unit>: <proto-name> <additional info...>
121 *
122 * with <if-name><unit> being something like "bppp0", and <proto-name>
123 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
124 */
125
126 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
127 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
128 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */
129
130 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
131 #define PPP_UI 0x03 /* Unnumbered Information */
132 #define PPP_IP 0x0021 /* Internet Protocol */
133 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
134 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
135 #define PPP_IPX 0x002b /* Novell IPX Protocol */
136 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */
137 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */
138 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */
139 #define PPP_LCP 0xc021 /* Link Control Protocol */
140 #define PPP_PAP 0xc023 /* Password Authentication Protocol */
141 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
142 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
143 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
144
145 #define CONF_REQ 1 /* PPP configure request */
146 #define CONF_ACK 2 /* PPP configure acknowledge */
147 #define CONF_NAK 3 /* PPP configure negative ack */
148 #define CONF_REJ 4 /* PPP configure reject */
149 #define TERM_REQ 5 /* PPP terminate request */
150 #define TERM_ACK 6 /* PPP terminate acknowledge */
151 #define CODE_REJ 7 /* PPP code reject */
152 #define PROTO_REJ 8 /* PPP protocol reject */
153 #define ECHO_REQ 9 /* PPP echo request */
154 #define ECHO_REPLY 10 /* PPP echo reply */
155 #define DISC_REQ 11 /* PPP discard request */
156
157 #define LCP_OPT_MRU 1 /* maximum receive unit */
158 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
159 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
160 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
161 #define LCP_OPT_MAGIC 5 /* magic number */
162 #define LCP_OPT_RESERVED 6 /* reserved */
163 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
164 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
165
166 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
167 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
168 #define IPCP_OPT_ADDRESS 3 /* local IP address */
169
170 #define IPV6CP_OPT_IFID 1 /* interface identifier */
171 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
172
173 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */
174
175 #define PAP_REQ 1 /* PAP name/password request */
176 #define PAP_ACK 2 /* PAP acknowledge */
177 #define PAP_NAK 3 /* PAP fail */
178
179 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
180 #define CHAP_RESPONSE 2 /* CHAP challenge response */
181 #define CHAP_SUCCESS 3 /* CHAP response ok */
182 #define CHAP_FAILURE 4 /* CHAP response failed */
183
184 #define CHAP_MD5 5 /* hash algorithm - MD5 */
185
186 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
187 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
188 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
189 #define CISCO_ADDR_REQ 0 /* Cisco address request */
190 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
191 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
192
193 /* states are named and numbered according to RFC 1661 */
194 #define STATE_INITIAL 0
195 #define STATE_STARTING 1
196 #define STATE_CLOSED 2
197 #define STATE_STOPPED 3
198 #define STATE_CLOSING 4
199 #define STATE_STOPPING 5
200 #define STATE_REQ_SENT 6
201 #define STATE_ACK_RCVD 7
202 #define STATE_ACK_SENT 8
203 #define STATE_OPENED 9
204
205 struct ppp_header {
206 u_char address;
207 u_char control;
208 u_short protocol;
209 } __attribute__((__packed__));
210 #define PPP_HEADER_LEN sizeof (struct ppp_header)
211
212 struct lcp_header {
213 u_char type;
214 u_char ident;
215 u_short len;
216 } __attribute__((__packed__));
217 #define LCP_HEADER_LEN sizeof (struct lcp_header)
218
219 struct cisco_packet {
220 u_long type;
221 u_long par1;
222 u_long par2;
223 u_short rel;
224 u_short time0;
225 u_short time1;
226 } __attribute__((__packed__));
227 #define CISCO_PACKET_LEN sizeof (struct cisco_packet)
228
229 /*
230 * We follow the spelling and capitalization of RFC 1661 here, to make
231 * it easier comparing with the standard. Please refer to this RFC in
232 * case you can't make sense out of these abbreviation; it will also
233 * explain the semantics related to the various events and actions.
234 */
235 struct cp {
236 u_short proto; /* PPP control protocol number */
237 u_char protoidx; /* index into state table in struct sppp */
238 u_char flags;
239 #define CP_LCP 0x01 /* this is the LCP */
240 #define CP_AUTH 0x02 /* this is an authentication protocol */
241 #define CP_NCP 0x04 /* this is a NCP */
242 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
243 const char *name; /* name of this control protocol */
244 /* event handlers */
245 void (*Up)(struct sppp *sp);
246 void (*Down)(struct sppp *sp);
247 void (*Open)(struct sppp *sp);
248 void (*Close)(struct sppp *sp);
249 void (*TO)(void *sp);
250 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
251 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
252 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
253 /* actions */
254 void (*tlu)(struct sppp *sp);
255 void (*tld)(struct sppp *sp);
256 void (*tls)(struct sppp *sp);
257 void (*tlf)(struct sppp *sp);
258 void (*scr)(struct sppp *sp);
259 };
260
261 static struct sppp *spppq;
262 #if defined(__DragonFly__)
263 static struct callout keepalive_timeout;
264 #endif
265
266 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__)
267 #define SPP_FMT "%s%d: "
268 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit
269 #else
270 #define SPP_FMT "%s: "
271 #define SPP_ARGS(ifp) (ifp)->if_xname
272 #endif
273
274 #ifdef INET
275 /*
276 * The following disgusting hack gets around the problem that IP TOS
277 * can't be set yet. We want to put "interactive" traffic on a high
278 * priority queue. To decide if traffic is interactive, we check that
279 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
280 *
281 * XXX is this really still necessary? - joerg -
282 */
283 static u_short interactive_ports[8] = {
284 0, 513, 0, 0,
285 0, 21, 0, 23,
286 };
287 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
288 #endif
289
290 /* almost every function needs these */
291 #define STDDCL \
292 struct ifnet *ifp = &sp->pp_if; \
293 int debug = ifp->if_flags & IFF_DEBUG
294
295 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
296 struct sockaddr *dst, struct rtentry *rt);
297
298 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
299 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
300
301 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
302 struct mbuf *m);
303 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
304 u_char ident, u_short len, void *data);
305 /* static void sppp_cp_timeout(void *arg); */
306 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
307 int newstate);
308 static void sppp_auth_send(const struct cp *cp,
309 struct sppp *sp, unsigned int type, unsigned int id,
310 ...);
311
312 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
313 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
314 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
315 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
316 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
317
318 static void sppp_null(struct sppp *sp);
319
320 static void sppp_lcp_init(struct sppp *sp);
321 static void sppp_lcp_up(struct sppp *sp);
322 static void sppp_lcp_down(struct sppp *sp);
323 static void sppp_lcp_open(struct sppp *sp);
324 static void sppp_lcp_close(struct sppp *sp);
325 static void sppp_lcp_TO(void *sp);
326 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
327 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
328 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
329 static void sppp_lcp_tlu(struct sppp *sp);
330 static void sppp_lcp_tld(struct sppp *sp);
331 static void sppp_lcp_tls(struct sppp *sp);
332 static void sppp_lcp_tlf(struct sppp *sp);
333 static void sppp_lcp_scr(struct sppp *sp);
334 static void sppp_lcp_check_and_close(struct sppp *sp);
335 static int sppp_ncp_check(struct sppp *sp);
336
337 static void sppp_ipcp_init(struct sppp *sp);
338 static void sppp_ipcp_up(struct sppp *sp);
339 static void sppp_ipcp_down(struct sppp *sp);
340 static void sppp_ipcp_open(struct sppp *sp);
341 static void sppp_ipcp_close(struct sppp *sp);
342 static void sppp_ipcp_TO(void *sp);
343 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
344 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
345 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
346 static void sppp_ipcp_tlu(struct sppp *sp);
347 static void sppp_ipcp_tld(struct sppp *sp);
348 static void sppp_ipcp_tls(struct sppp *sp);
349 static void sppp_ipcp_tlf(struct sppp *sp);
350 static void sppp_ipcp_scr(struct sppp *sp);
351
352 static void sppp_ipv6cp_init(struct sppp *sp);
353 static void sppp_ipv6cp_up(struct sppp *sp);
354 static void sppp_ipv6cp_down(struct sppp *sp);
355 static void sppp_ipv6cp_open(struct sppp *sp);
356 static void sppp_ipv6cp_close(struct sppp *sp);
357 static void sppp_ipv6cp_TO(void *sp);
358 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
359 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
360 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
361 static void sppp_ipv6cp_tlu(struct sppp *sp);
362 static void sppp_ipv6cp_tld(struct sppp *sp);
363 static void sppp_ipv6cp_tls(struct sppp *sp);
364 static void sppp_ipv6cp_tlf(struct sppp *sp);
365 static void sppp_ipv6cp_scr(struct sppp *sp);
366
367 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
368 static void sppp_pap_init(struct sppp *sp);
369 static void sppp_pap_open(struct sppp *sp);
370 static void sppp_pap_close(struct sppp *sp);
371 static void sppp_pap_TO(void *sp);
372 static void sppp_pap_my_TO(void *sp);
373 static void sppp_pap_tlu(struct sppp *sp);
374 static void sppp_pap_tld(struct sppp *sp);
375 static void sppp_pap_scr(struct sppp *sp);
376
377 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
378 static void sppp_chap_init(struct sppp *sp);
379 static void sppp_chap_open(struct sppp *sp);
380 static void sppp_chap_close(struct sppp *sp);
381 static void sppp_chap_TO(void *sp);
382 static void sppp_chap_tlu(struct sppp *sp);
383 static void sppp_chap_tld(struct sppp *sp);
384 static void sppp_chap_scr(struct sppp *sp);
385
386 static const char *sppp_auth_type_name(u_short proto, u_char type);
387 static const char *sppp_cp_type_name(u_char type);
388 static const char *sppp_dotted_quad(u_long addr);
389 static const char *sppp_ipcp_opt_name(u_char opt);
390 #ifdef INET6
391 static const char *sppp_ipv6cp_opt_name(u_char opt);
392 #endif
393 static const char *sppp_lcp_opt_name(u_char opt);
394 static const char *sppp_phase_name(enum ppp_phase phase);
395 static const char *sppp_proto_name(u_short proto);
396 static const char *sppp_state_name(int state);
397 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
398 static int sppp_strnlen(u_char *p, int max);
399 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
400 u_long *srcmask);
401 static void sppp_keepalive(void *dummy);
402 static void sppp_phase_network(struct sppp *sp);
403 static void sppp_print_bytes(const u_char *p, u_short len);
404 static void sppp_print_string(const char *p, u_short len);
405 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
406 #ifdef INET6
407 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
408 struct in6_addr *dst, struct in6_addr *srcmask);
409 #ifdef IPV6CP_MYIFID_DYN
410 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
411 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
412 #endif
413 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
414 #endif
415
416 /* our control protocol descriptors */
417 static const struct cp lcp = {
418 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
419 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
420 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
421 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
422 sppp_lcp_scr
423 };
424
425 static const struct cp ipcp = {
426 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
427 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
428 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
429 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
430 sppp_ipcp_scr
431 };
432
433 static const struct cp ipv6cp = {
434 PPP_IPV6CP, IDX_IPV6CP,
435 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
436 CP_NCP,
437 #else
438 0,
439 #endif
440 "ipv6cp",
441 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
442 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
443 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
444 sppp_ipv6cp_scr
445 };
446
447 static const struct cp pap = {
448 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
449 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
450 sppp_pap_TO, 0, 0, 0,
451 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
452 sppp_pap_scr
453 };
454
455 static const struct cp chap = {
456 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
457 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
458 sppp_chap_TO, 0, 0, 0,
459 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
460 sppp_chap_scr
461 };
462
463 static const struct cp *cps[IDX_COUNT] = {
464 &lcp, /* IDX_LCP */
465 &ipcp, /* IDX_IPCP */
466 &ipv6cp, /* IDX_IPV6CP */
467 &pap, /* IDX_PAP */
468 &chap, /* IDX_CHAP */
469 };
470
471 static int
472 sppp_modevent(module_t mod, int type, void *unused)
473 {
474 switch (type) {
475 case MOD_LOAD:
476 break;
477 case MOD_UNLOAD:
478 return EACCES;
479 break;
480 default:
481 break;
482 }
483 return 0;
484 }
485 static moduledata_t spppmod = {
486 "sppp",
487 sppp_modevent,
488 0
489 };
490 MODULE_VERSION(sppp, 1);
491 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
492
493 /*
494 * Exported functions, comprising our interface to the lower layer.
495 */
496
497 /*
498 * Process the received packet.
499 */
500 void
501 sppp_input(struct ifnet *ifp, struct mbuf *m)
502 {
503 struct ppp_header *h;
504 int isr = -1;
505 struct sppp *sp = (struct sppp *)ifp;
506 u_char *iphdr;
507 int hlen, vjlen, do_account = 0;
508 int debug = ifp->if_flags & IFF_DEBUG;
509
510 if (ifp->if_flags & IFF_UP)
511 /* Count received bytes, add FCS and one flag */
512 ifp->if_ibytes += m->m_pkthdr.len + 3;
513
514 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
515 /* Too small packet, drop it. */
516 if (debug)
517 log(LOG_DEBUG,
518 SPP_FMT "input packet is too small, %d bytes\n",
519 SPP_ARGS(ifp), m->m_pkthdr.len);
520 drop:
521 m_freem (m);
522 drop2:
523 ++ifp->if_ierrors;
524 ++ifp->if_iqdrops;
525 return;
526 }
527
528 /* Get PPP header. */
529 h = mtod (m, struct ppp_header*);
530 m_adj (m, PPP_HEADER_LEN);
531
532 switch (h->address) {
533 case PPP_ALLSTATIONS:
534 if (h->control != PPP_UI)
535 goto invalid;
536 if (sp->pp_mode == IFF_CISCO) {
537 if (debug)
538 log(LOG_DEBUG,
539 SPP_FMT "PPP packet in Cisco mode "
540 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
541 SPP_ARGS(ifp),
542 h->address, h->control, ntohs(h->protocol));
543 goto drop;
544 }
545 switch (ntohs (h->protocol)) {
546 default:
547 if (debug)
548 log(LOG_DEBUG,
549 SPP_FMT "rejecting protocol "
550 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
551 SPP_ARGS(ifp),
552 h->address, h->control, ntohs(h->protocol));
553 if (sp->state[IDX_LCP] == STATE_OPENED)
554 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
555 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
556 &h->protocol);
557 ++ifp->if_noproto;
558 goto drop;
559 case PPP_LCP:
560 sppp_cp_input(&lcp, sp, m);
561 m_freem (m);
562 return;
563 case PPP_PAP:
564 if (sp->pp_phase >= PHASE_AUTHENTICATE)
565 sppp_pap_input(sp, m);
566 m_freem (m);
567 return;
568 case PPP_CHAP:
569 if (sp->pp_phase >= PHASE_AUTHENTICATE)
570 sppp_chap_input(sp, m);
571 m_freem (m);
572 return;
573 #ifdef INET
574 case PPP_IPCP:
575 if (sp->pp_phase == PHASE_NETWORK)
576 sppp_cp_input(&ipcp, sp, m);
577 m_freem (m);
578 return;
579 case PPP_IP:
580 if (sp->state[IDX_IPCP] == STATE_OPENED) {
581 isr = NETISR_IP;
582 }
583 do_account++;
584 break;
585 case PPP_VJ_COMP:
586 if (sp->state[IDX_IPCP] == STATE_OPENED) {
587 if ((vjlen =
588 sl_uncompress_tcp_core(mtod(m, u_char *),
589 m->m_len, m->m_len,
590 TYPE_COMPRESSED_TCP,
591 sp->pp_comp,
592 &iphdr, &hlen)) <= 0) {
593 if (debug)
594 log(LOG_INFO,
595 SPP_FMT "VJ uncompress failed on compressed packet\n",
596 SPP_ARGS(ifp));
597 goto drop;
598 }
599
600 /*
601 * Trim the VJ header off the packet, and prepend
602 * the uncompressed IP header (which will usually
603 * end up in two chained mbufs since there's not
604 * enough leading space in the existing mbuf).
605 */
606 m_adj(m, vjlen);
607 M_PREPEND(m, hlen, MB_DONTWAIT);
608 if (m == NULL)
609 goto drop2;
610 bcopy(iphdr, mtod(m, u_char *), hlen);
611
612 isr = NETISR_IP;
613 }
614 do_account++;
615 break;
616 case PPP_VJ_UCOMP:
617 if (sp->state[IDX_IPCP] == STATE_OPENED) {
618 if (sl_uncompress_tcp_core(mtod(m, u_char *),
619 m->m_len, m->m_len,
620 TYPE_UNCOMPRESSED_TCP,
621 sp->pp_comp,
622 &iphdr, &hlen) != 0) {
623 if (debug)
624 log(LOG_INFO,
625 SPP_FMT "VJ uncompress failed on uncompressed packet\n",
626 SPP_ARGS(ifp));
627 goto drop;
628 }
629 isr = NETISR_IP;
630 }
631 do_account++;
632 break;
633 #endif
634 #ifdef INET6
635 case PPP_IPV6CP:
636 if (sp->pp_phase == PHASE_NETWORK)
637 sppp_cp_input(&ipv6cp, sp, m);
638 m_freem (m);
639 return;
640
641 case PPP_IPV6:
642 if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
643 isr = NETISR_IPV6;
644 }
645 do_account++;
646 break;
647 #endif
648 #ifdef IPX
649 case PPP_IPX:
650 /* IPX IPXCP not implemented yet */
651 if (sp->pp_phase == PHASE_NETWORK) {
652 isr = NETISR_IPX;
653 }
654 do_account++;
655 break;
656 #endif
657 #ifdef NS
658 case PPP_XNS:
659 /* XNS IDPCP not implemented yet */
660 if (sp->pp_phase == PHASE_NETWORK) {
661 isr = NETISR_NS;
662 }
663 do_account++;
664 break;
665 #endif
666 }
667 break;
668 case CISCO_MULTICAST:
669 case CISCO_UNICAST:
670 /* Don't check the control field here (RFC 1547). */
671 if (sp->pp_mode != IFF_CISCO) {
672 if (debug)
673 log(LOG_DEBUG,
674 SPP_FMT "Cisco packet in PPP mode "
675 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
676 SPP_ARGS(ifp),
677 h->address, h->control, ntohs(h->protocol));
678 goto drop;
679 }
680 switch (ntohs (h->protocol)) {
681 default:
682 ++ifp->if_noproto;
683 goto invalid;
684 case CISCO_KEEPALIVE:
685 sppp_cisco_input ((struct sppp*) ifp, m);
686 m_freem (m);
687 return;
688 #ifdef INET
689 case ETHERTYPE_IP:
690 isr = NETISR_IP;
691 do_account++;
692 break;
693 #endif
694 #ifdef INET6
695 case ETHERTYPE_IPV6:
696 isr = NETISR_IPV6;
697 do_account++;
698 break;
699 #endif
700 #ifdef IPX
701 case ETHERTYPE_IPX:
702 isr = NETISR_IPX;
703 do_account++;
704 break;
705 #endif
706 #ifdef NS
707 case ETHERTYPE_NS:
708 isr = NETISR_NS
709 do_account++;
710 break;
711 #endif
712 }
713 break;
714 default: /* Invalid PPP packet. */
715 invalid:
716 if (debug)
717 log(LOG_DEBUG,
718 SPP_FMT "invalid input packet "
719 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
720 SPP_ARGS(ifp),
721 h->address, h->control, ntohs(h->protocol));
722 goto drop;
723 }
724
725 if (! (ifp->if_flags & IFF_UP) || isr < 0)
726 goto drop;
727
728 /* Check queue. */
729
730 netisr_dispatch(isr, m);
731 if (do_account)
732 /*
733 * Do only account for network packets, not for control
734 * packets. This is used by some subsystems to detect
735 * idle lines.
736 */
737 sp->pp_last_recv = time_second;
738 }
739
740 /*
741 * Enqueue transmit packet.
742 */
743 static int
744 sppp_output(struct ifnet *ifp, struct mbuf *m,
745 struct sockaddr *dst, struct rtentry *rt)
746 {
747 struct sppp *sp = (struct sppp*) ifp;
748 struct ppp_header *h;
749 struct ifqueue *ifq = NULL;
750 int rv = 0;
751 int ipproto = PPP_IP;
752 int debug = ifp->if_flags & IFF_DEBUG;
753 struct altq_pktattr pktattr;
754
755 crit_enter();
756
757 if ((ifp->if_flags & IFF_UP) == 0 ||
758 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
759 #ifdef INET6
760 drop:
761 #endif
762 m_freem (m);
763 crit_exit();
764 return (ENETDOWN);
765 }
766
767 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
768 #ifdef INET6
769 /*
770 * XXX
771 *
772 * Hack to prevent the initialization-time generated
773 * IPv6 multicast packet to erroneously cause a
774 * dialout event in case IPv6 has been
775 * administratively disabled on that interface.
776 */
777 if (dst->sa_family == AF_INET6 &&
778 !(sp->confflags & CONF_ENABLE_IPV6))
779 goto drop;
780 #endif
781 /*
782 * Interface is not yet running, but auto-dial. Need
783 * to start LCP for it.
784 */
785 ifp->if_flags |= IFF_RUNNING;
786 crit_exit();
787 lcp.Open(sp);
788 crit_enter();
789 }
790
791 /*
792 * if the queueing discipline needs packet classification,
793 * do it before prepending link headers.
794 */
795 ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
796
797 #ifdef INET
798 if (dst->sa_family == AF_INET) {
799 /* XXX Check mbuf length here? */
800 struct ip *ip = mtod (m, struct ip*);
801 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
802
803 /*
804 * When using dynamic local IP address assignment by using
805 * 0.0.0.0 as a local address, the first TCP session will
806 * not connect because the local TCP checksum is computed
807 * using 0.0.0.0 which will later become our real IP address
808 * so the TCP checksum computed at the remote end will
809 * become invalid. So we
810 * - don't let packets with src ip addr 0 thru
811 * - we flag TCP packets with src ip 0 as an error
812 */
813
814 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
815 {
816 m_freem(m);
817 crit_exit();
818 if(ip->ip_p == IPPROTO_TCP)
819 return(EADDRNOTAVAIL);
820 else
821 return(0);
822 }
823
824 /*
825 * Put low delay, telnet, rlogin and ftp control packets
826 * in front of the queue.
827 */
828 if (IF_QFULL (&sp->pp_fastq))
829 ;
830 else if (ip->ip_tos & IPTOS_LOWDELAY)
831 ifq = &sp->pp_fastq;
832 else if (m->m_len < sizeof *ip + sizeof *tcp)
833 ;
834 else if (ip->ip_p != IPPROTO_TCP)
835 ;
836 else if (INTERACTIVE (ntohs (tcp->th_sport)))
837 ifq = &sp->pp_fastq;
838 else if (INTERACTIVE (ntohs (tcp->th_dport)))
839 ifq = &sp->pp_fastq;
840
841 /*
842 * Do IP Header compression
843 */
844 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
845 ip->ip_p == IPPROTO_TCP)
846 switch (sl_compress_tcp(m, ip, sp->pp_comp,
847 sp->ipcp.compress_cid)) {
848 case TYPE_COMPRESSED_TCP:
849 ipproto = PPP_VJ_COMP;
850 break;
851 case TYPE_UNCOMPRESSED_TCP:
852 ipproto = PPP_VJ_UCOMP;
853 break;
854 case TYPE_IP:
855 ipproto = PPP_IP;
856 break;
857 default:
858 m_freem(m);
859 crit_exit();
860 return (EINVAL);
861 }
862 }
863 #endif
864
865 #ifdef INET6
866 if (dst->sa_family == AF_INET6) {
867 /* XXX do something tricky here? */
868 }
869 #endif
870
871 /*
872 * Prepend general data packet PPP header. For now, IP only.
873 */
874 M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT);
875 if (! m) {
876 if (debug)
877 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
878 SPP_ARGS(ifp));
879 ++ifp->if_oerrors;
880 crit_exit();
881 return (ENOBUFS);
882 }
883 /*
884 * May want to check size of packet
885 * (albeit due to the implementation it's always enough)
886 */
887 h = mtod (m, struct ppp_header*);
888 if (sp->pp_mode == IFF_CISCO) {
889 h->address = CISCO_UNICAST; /* unicast address */
890 h->control = 0;
891 } else {
892 h->address = PPP_ALLSTATIONS; /* broadcast address */
893 h->control = PPP_UI; /* Unnumbered Info */
894 }
895
896 switch (dst->sa_family) {
897 #ifdef INET
898 case AF_INET: /* Internet Protocol */
899 if (sp->pp_mode == IFF_CISCO)
900 h->protocol = htons (ETHERTYPE_IP);
901 else {
902 /*
903 * Don't choke with an ENETDOWN early. It's
904 * possible that we just started dialing out,
905 * so don't drop the packet immediately. If
906 * we notice that we run out of buffer space
907 * below, we will however remember that we are
908 * not ready to carry IP packets, and return
909 * ENETDOWN, as opposed to ENOBUFS.
910 */
911 h->protocol = htons(ipproto);
912 if (sp->state[IDX_IPCP] != STATE_OPENED)
913 rv = ENETDOWN;
914 }
915 break;
916 #endif
917 #ifdef INET6
918 case AF_INET6: /* Internet Protocol */
919 if (sp->pp_mode == IFF_CISCO)
920 h->protocol = htons (ETHERTYPE_IPV6);
921 else {
922 /*
923 * Don't choke with an ENETDOWN early. It's
924 * possible that we just started dialing out,
925 * so don't drop the packet immediately. If
926 * we notice that we run out of buffer space
927 * below, we will however remember that we are
928 * not ready to carry IP packets, and return
929 * ENETDOWN, as opposed to ENOBUFS.
930 */
931 h->protocol = htons(PPP_IPV6);
932 if (sp->state[IDX_IPV6CP] != STATE_OPENED)
933 rv = ENETDOWN;
934 }
935 break;
936 #endif
937 #ifdef NS
938 case AF_NS: /* Xerox NS Protocol */
939 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
940 ETHERTYPE_NS : PPP_XNS);
941 break;
942 #endif
943 #ifdef IPX
944 case AF_IPX: /* Novell IPX Protocol */
945 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
946 ETHERTYPE_IPX : PPP_IPX);
947 break;
948 #endif
949 default:
950 m_freem (m);
951 ++ifp->if_oerrors;
952 crit_exit();
953 return (EAFNOSUPPORT);
954 }
955
956 /*
957 * Queue message on interface, and start output if interface
958 * not yet active.
959 */
960 if (ifq != NULL) {
961 if (IF_QFULL(ifq)) {
962 IF_DROP(ifq);
963 m_freem(m);
964 rv = ENOBUFS;
965 ifq->ifq_drops++;
966 } else {
967 IF_ENQUEUE(ifq, m);
968 rv = 0;
969 }
970 } else {
971 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr);
972 }
973 if (rv) {
974 ++ifp->if_oerrors;
975 crit_exit();
976 return(rv);
977 }
978 if (! (ifp->if_flags & IFF_OACTIVE))
979 (*ifp->if_start) (ifp);
980
981 /*
982 * Count output packets and bytes.
983 * The packet length includes header, FCS and 1 flag,
984 * according to RFC 1333.
985 */
986 ifp->if_obytes += m->m_pkthdr.len + 3;
987
988 /*
989 * Unlike in sppp_input(), we can always bump the timestamp
990 * here since sppp_output() is only called on behalf of
991 * network-layer traffic; control-layer traffic is handled
992 * by sppp_cp_send().
993 */
994 sp->pp_last_sent = time_second;
995
996 crit_exit();
997 return (0);
998 }
999
1000 void
1001 sppp_attach(struct ifnet *ifp)
1002 {
1003 struct sppp *sp = (struct sppp*) ifp;
1004
1005 /* Initialize keepalive handler. */
1006 if (!spppq) {
1007 callout_reset(&keepalive_timeout, hz * 10,
1008 sppp_keepalive, NULL);
1009 }
1010 /* Insert new entry into the keepalive list. */
1011 sp->pp_next = spppq;
1012 spppq = sp;
1013
1014 sp->pp_if.if_mtu = PP_MTU;
1015 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1016 sp->pp_if.if_type = IFT_PPP;
1017 sp->pp_if.if_output = sppp_output;
1018 #if 0
1019 sp->pp_flags = PP_KEEPALIVE;
1020 #endif
1021 sp->pp_if.if_snd.ifq_maxlen = 32;
1022 sp->pp_fastq.ifq_maxlen = 32;
1023 sp->pp_cpq.ifq_maxlen = 20;
1024 sp->pp_loopcnt = 0;
1025 sp->pp_alivecnt = 0;
1026 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1027 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1028 sp->pp_phase = PHASE_DEAD;
1029 sp->pp_up = lcp.Up;
1030 sp->pp_down = lcp.Down;
1031 sp->pp_last_recv = sp->pp_last_sent = time_second;
1032 sp->confflags = 0;
1033 #ifdef INET
1034 sp->confflags |= CONF_ENABLE_VJ;
1035 #endif
1036 #ifdef INET6
1037 sp->confflags |= CONF_ENABLE_IPV6;
1038 #endif
1039 sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1040 sl_compress_init(sp->pp_comp, -1);
1041 sppp_lcp_init(sp);
1042 sppp_ipcp_init(sp);
1043 sppp_ipv6cp_init(sp);
1044 sppp_pap_init(sp);
1045 sppp_chap_init(sp);
1046 }
1047
1048 void
1049 sppp_detach(struct ifnet *ifp)
1050 {
1051 struct sppp **q, *p, *sp = (struct sppp*) ifp;
1052 int i;
1053
1054 /* Remove the entry from the keepalive list. */
1055 for (q = &spppq; (p = *q); q = &p->pp_next)
1056 if (p == sp) {
1057 *q = p->pp_next;
1058 break;
1059 }
1060
1061 /* Stop keepalive handler. */
1062 if (!spppq)
1063 callout_stop(&keepalive_timeout);
1064
1065 for (i = 0; i < IDX_COUNT; i++)
1066 callout_stop(&sp->timeout[i]);
1067 callout_stop(&sp->pap_my_to);
1068 }
1069
1070 /*
1071 * Flush the interface output queue.
1072 */
1073 void
1074 sppp_flush(struct ifnet *ifp)
1075 {
1076 struct sppp *sp = (struct sppp*) ifp;
1077
1078 ifq_purge(&sp->pp_if.if_snd);
1079 IF_DRAIN(&sp->pp_fastq);
1080 IF_DRAIN(&sp->pp_cpq);
1081 }
1082
1083 /*
1084 * Check if the output queue is empty.
1085 */
1086 int
1087 sppp_isempty(struct ifnet *ifp)
1088 {
1089 struct sppp *sp = (struct sppp*) ifp;
1090 int empty;
1091
1092 crit_enter();
1093 empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1094 ifq_is_empty(&sp->pp_if.if_snd);
1095 crit_exit();
1096 return (empty);
1097 }
1098
1099 /*
1100 * Get next packet to send.
1101 */
1102 struct mbuf *
1103 sppp_dequeue(struct ifnet *ifp)
1104 {
1105 struct sppp *sp = (struct sppp*) ifp;
1106 struct mbuf *m;
1107
1108 crit_enter();
1109
1110 /*
1111 * Process only the control protocol queue until we have at
1112 * least one NCP open.
1113 *
1114 * Do always serve all three queues in Cisco mode.
1115 */
1116 IF_DEQUEUE(&sp->pp_cpq, m);
1117 if (m == NULL &&
1118 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1119 IF_DEQUEUE(&sp->pp_fastq, m);
1120 if (m == NULL)
1121 m = ifq_dequeue(&sp->pp_if.if_snd, NULL);
1122 }
1123
1124 crit_exit();
1125 return m;
1126 }
1127
1128 /*
1129 * Pick the next packet, do not remove it from the queue.
1130 */
1131 struct mbuf *
1132 sppp_pick(struct ifnet *ifp)
1133 {
1134 struct sppp *sp = (struct sppp*)ifp;
1135 struct mbuf *m;
1136
1137 crit_enter();
1138
1139 m = sp->pp_cpq.ifq_head;
1140 if (m == NULL &&
1141 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1142 if ((m = sp->pp_fastq.ifq_head) == NULL)
1143 m = ifq_poll(&sp->pp_if.if_snd);
1144 }
1145
1146 crit_exit();
1147 return (m);
1148 }
1149
1150 /*
1151 * Process an ioctl request. Called on low priority level.
1152 */
1153 int
1154 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1155 {
1156 struct ifreq *ifr = (struct ifreq*) data;
1157 struct sppp *sp = (struct sppp*) ifp;
1158 int rv, going_up, going_down, newmode;
1159
1160 crit_enter();
1161
1162 rv = 0;
1163 switch (cmd) {
1164 case SIOCAIFADDR:
1165 case SIOCSIFDSTADDR:
1166 break;
1167
1168 case SIOCSIFADDR:
1169 /* set the interface "up" when assigning an IP address */
1170 ifp->if_flags |= IFF_UP;
1171 /* fall through... */
1172
1173 case SIOCSIFFLAGS:
1174 going_up = ifp->if_flags & IFF_UP &&
1175 (ifp->if_flags & IFF_RUNNING) == 0;
1176 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1177 ifp->if_flags & IFF_RUNNING;
1178
1179 newmode = ifp->if_flags & IFF_PASSIVE;
1180 if (!newmode)
1181 newmode = ifp->if_flags & IFF_AUTO;
1182 if (!newmode)
1183 newmode = ifp->if_flags & IFF_CISCO;
1184 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1185 ifp->if_flags |= newmode;
1186
1187 if (newmode != sp->pp_mode) {
1188 going_down = 1;
1189 if (!going_up)
1190 going_up = ifp->if_flags & IFF_RUNNING;
1191 }
1192
1193 if (going_down) {
1194 if (sp->pp_mode != IFF_CISCO)
1195 lcp.Close(sp);
1196 else if (sp->pp_tlf)
1197 (sp->pp_tlf)(sp);
1198 sppp_flush(ifp);
1199 ifp->if_flags &= ~IFF_RUNNING;
1200 sp->pp_mode = newmode;
1201 }
1202
1203 if (going_up) {
1204 if (sp->pp_mode != IFF_CISCO)
1205 lcp.Close(sp);
1206 sp->pp_mode = newmode;
1207 if (sp->pp_mode == 0) {
1208 ifp->if_flags |= IFF_RUNNING;
1209 lcp.Open(sp);
1210 }
1211 if (sp->pp_mode == IFF_CISCO) {
1212 if (sp->pp_tls)
1213 (sp->pp_tls)(sp);
1214 ifp->if_flags |= IFF_RUNNING;
1215 }
1216 }
1217
1218 break;
1219
1220 #ifdef SIOCSIFMTU
1221 #ifndef ifr_mtu
1222 #define ifr_mtu ifr_metric
1223 #endif
1224 case SIOCSIFMTU:
1225 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1226 return (EINVAL);
1227 ifp->if_mtu = ifr->ifr_mtu;
1228 break;
1229 #endif
1230 #ifdef SLIOCSETMTU
1231 case SLIOCSETMTU:
1232 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1233 return (EINVAL);
1234 ifp->if_mtu = *(short*)data;
1235 break;
1236 #endif
1237 #ifdef SIOCGIFMTU
1238 case SIOCGIFMTU:
1239 ifr->ifr_mtu = ifp->if_mtu;
1240 break;
1241 #endif
1242 #ifdef SLIOCGETMTU
1243 case SLIOCGETMTU:
1244 *(short*)data = ifp->if_mtu;
1245 break;
1246 #endif
1247 case SIOCADDMULTI:
1248 case SIOCDELMULTI:
1249 break;
1250
1251 case SIOCGIFGENERIC:
1252 case SIOCSIFGENERIC:
1253 rv = sppp_params(sp, cmd, data);
1254 break;
1255
1256 default:
1257 rv = ENOTTY;
1258 }
1259
1260 crit_exit();
1261 return rv;
1262 }
1263
1264 /*
1265 * Cisco framing implementation.
1266 */
1267
1268 /*
1269 * Handle incoming Cisco keepalive protocol packets.
1270 */
1271 static void
1272 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1273 {
1274 STDDCL;
1275 struct cisco_packet *h;
1276 u_long me, mymask;
1277
1278 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1279 if (debug)
1280 log(LOG_DEBUG,
1281 SPP_FMT "cisco invalid packet length: %d bytes\n",
1282 SPP_ARGS(ifp), m->m_pkthdr.len);
1283 return;
1284 }
1285 h = mtod (m, struct cisco_packet*);
1286 if (debug)
1287 log(LOG_DEBUG,
1288 SPP_FMT "cisco input: %d bytes "
1289 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1290 SPP_ARGS(ifp), m->m_pkthdr.len,
1291 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1292 (u_int)h->time0, (u_int)h->time1);
1293 switch (ntohl (h->type)) {
1294 default:
1295 if (debug)
1296 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1297 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1298 break;
1299 case CISCO_ADDR_REPLY:
1300 /* Reply on address request, ignore */
1301 break;
1302 case CISCO_KEEPALIVE_REQ:
1303 sp->pp_alivecnt = 0;
1304 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1305 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1306 /* Local and remote sequence numbers are equal.
1307 * Probably, the line is in loopback mode. */
1308 if (sp->pp_loopcnt >= MAXALIVECNT) {
1309 kprintf (SPP_FMT "loopback\n",
1310 SPP_ARGS(ifp));
1311 sp->pp_loopcnt = 0;
1312 if (ifp->if_flags & IFF_UP) {
1313 if_down (ifp);
1314 IF_DRAIN(&sp->pp_cpq);
1315 }
1316 }
1317 ++sp->pp_loopcnt;
1318
1319 /* Generate new local sequence number */
1320 #if defined(__DragonFly__)
1321 sp->pp_seq[IDX_LCP] = krandom();
1322 #else
1323 sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1324 #endif
1325 break;
1326 }
1327 sp->pp_loopcnt = 0;
1328 if (! (ifp->if_flags & IFF_UP) &&
1329 (ifp->if_flags & IFF_RUNNING)) {
1330 if_up(ifp);
1331 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
1332 }
1333 break;
1334 case CISCO_ADDR_REQ:
1335 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1336 if (me != 0L)
1337 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1338 break;
1339 }
1340 }
1341
1342 /*
1343 * Send Cisco keepalive packet.
1344 */
1345 static void
1346 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1347 {
1348 STDDCL;
1349 struct ppp_header *h;
1350 struct cisco_packet *ch;
1351 struct mbuf *m;
1352 #if defined(__DragonFly__)
1353 struct timeval tv;
1354 #else
1355 u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1356 #endif
1357
1358 #if defined(__DragonFly__)
1359 getmicrouptime(&tv);
1360 #endif
1361
1362 MGETHDR (m, MB_DONTWAIT, MT_DATA);
1363 if (! m)
1364 return;
1365 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1366 m->m_pkthdr.rcvif = 0;
1367
1368 h = mtod (m, struct ppp_header*);
1369 h->address = CISCO_MULTICAST;
1370 h->control = 0;
1371 h->protocol = htons (CISCO_KEEPALIVE);
1372
1373 ch = (struct cisco_packet*) (h + 1);
1374 ch->type = htonl (type);
1375 ch->par1 = htonl (par1);
1376 ch->par2 = htonl (par2);
1377 ch->rel = -1;
1378
1379 #if defined(__DragonFly__)
1380 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1381 ch->time1 = htons ((u_short) tv.tv_sec);
1382 #else
1383 ch->time0 = htons ((u_short) (t >> 16));
1384 ch->time1 = htons ((u_short) t);
1385 #endif
1386
1387 if (debug)
1388 log(LOG_DEBUG,
1389 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1390 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1391 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1392
1393 if (IF_QFULL (&sp->pp_cpq)) {
1394 IF_DROP (&sp->pp_fastq);
1395 IF_DROP (&ifp->if_snd);
1396 m_freem (m);
1397 } else
1398 IF_ENQUEUE (&sp->pp_cpq, m);
1399 if (! (ifp->if_flags & IFF_OACTIVE))
1400 (*ifp->if_start) (ifp);
1401 ifp->if_obytes += m->m_pkthdr.len + 3;
1402 }
1403
1404 /*
1405 * PPP protocol implementation.
1406 */
1407
1408 /*
1409 * Send PPP control protocol packet.
1410 */
1411 static void
1412 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1413 u_char ident, u_short len, void *data)
1414 {
1415 STDDCL;
1416 struct ppp_header *h;
1417 struct lcp_header *lh;
1418 struct mbuf *m;
1419
1420 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1421 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1422 MGETHDR (m, MB_DONTWAIT, MT_DATA);
1423 if (! m)
1424 return;
1425 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1426 m->m_pkthdr.rcvif = 0;
1427
1428 h = mtod (m, struct ppp_header*);
1429 h->address = PPP_ALLSTATIONS; /* broadcast address */
1430 h->control = PPP_UI; /* Unnumbered Info */
1431 h->protocol = htons (proto); /* Link Control Protocol */
1432
1433 lh = (struct lcp_header*) (h + 1);
1434 lh->type = type;
1435 lh->ident = ident;
1436 lh->len = htons (LCP_HEADER_LEN + len);
1437 if (len)
1438 bcopy (data, lh+1, len);
1439
1440 if (debug) {
1441 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1442 SPP_ARGS(ifp),
1443 sppp_proto_name(proto),
1444 sppp_cp_type_name (lh->type), lh->ident,
1445 ntohs (lh->len));
1446 sppp_print_bytes ((u_char*) (lh+1), len);
1447 log(-1, ">\n");
1448 }
1449 if (IF_QFULL (&sp->pp_cpq)) {
1450 IF_DROP (&sp->pp_fastq);
1451 IF_DROP (&ifp->if_snd);
1452 m_freem (m);
1453 ++ifp->if_oerrors;
1454 } else
1455 IF_ENQUEUE (&sp->pp_cpq, m);
1456 if (! (ifp->if_flags & IFF_OACTIVE))
1457 (*ifp->if_start) (ifp);
1458 ifp->if_obytes += m->m_pkthdr.len + 3;
1459 }
1460
1461 /*
1462 * Handle incoming PPP control protocol packets.
1463 */
1464 static void
1465 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1466 {
1467 STDDCL;
1468 struct lcp_header *h;
1469 int printlen, len = m->m_pkthdr.len;
1470 int rv;
1471 u_char *p;
1472
1473 if (len < 4) {
1474 if (debug)
1475 log(LOG_DEBUG,
1476 SPP_FMT "%s invalid packet length: %d bytes\n",
1477 SPP_ARGS(ifp), cp->name, len);
1478 return;
1479 }
1480 h = mtod (m, struct lcp_header*);
1481 if (debug) {
1482 printlen = ntohs(h->len);
1483 log(LOG_DEBUG,
1484 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1485 SPP_ARGS(ifp), cp->name,
1486 sppp_state_name(sp->state[cp->protoidx]),
1487 sppp_cp_type_name (h->type), h->ident, printlen);
1488 if (len < printlen)
1489 printlen = len;
1490 if (printlen > 4)
1491 sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1492 log(-1, ">\n");
1493 }
1494 if (len > ntohs (h->len))
1495 len = ntohs (h->len);
1496 p = (u_char *)(h + 1);
1497 switch (h->type) {
1498 case CONF_REQ:
1499 if (len < 4) {
1500 if (debug)
1501 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1502 SPP_ARGS(ifp), cp->name,
1503 len);
1504 ++ifp->if_ierrors;
1505 break;
1506 }
1507 /* handle states where RCR doesn't get a SCA/SCN */
1508 switch (sp->state[cp->protoidx]) {
1509 case STATE_CLOSING:
1510 case STATE_STOPPING:
1511 return;
1512 case STATE_CLOSED:
1513 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1514 0, 0);
1515 return;
1516 }
1517 rv = (cp->RCR)(sp, h, len);
1518 if (rv < 0) {
1519 /* fatal error, shut down */
1520 (cp->tld)(sp);
1521 sppp_lcp_tlf(sp);
1522 return;
1523 }
1524 switch (sp->state[cp->protoidx]) {
1525 case STATE_OPENED:
1526 (cp->tld)(sp);
1527 (cp->scr)(sp);
1528 /* fall through... */
1529 case STATE_ACK_SENT:
1530 case STATE_REQ_SENT:
1531 /*
1532 * sppp_cp_change_state() have the side effect of
1533 * restarting the timeouts. We want to avoid that
1534 * if the state don't change, otherwise we won't
1535 * ever timeout and resend a configuration request
1536 * that got lost.
1537 */
1538 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1539 STATE_REQ_SENT))
1540 break;
1541 sppp_cp_change_state(cp, sp, rv?
1542 STATE_ACK_SENT: STATE_REQ_SENT);
1543 break;
1544 case STATE_STOPPED:
1545 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1546 (cp->scr)(sp);
1547 sppp_cp_change_state(cp, sp, rv?
1548 STATE_ACK_SENT: STATE_REQ_SENT);
1549 break;
1550 case STATE_ACK_RCVD:
1551 if (rv) {
1552 sppp_cp_change_state(cp, sp, STATE_OPENED);
1553 if (debug)
1554 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1555 SPP_ARGS(ifp),
1556 cp->name);
1557 (cp->tlu)(sp);
1558 } else
1559 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1560 break;
1561 default:
1562 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1563 SPP_ARGS(ifp), cp->name,
1564 sppp_cp_type_name(h->type),
1565 sppp_state_name(sp->state[cp->protoidx]));
1566 ++ifp->if_ierrors;
1567 }
1568 break;
1569 case CONF_ACK:
1570 if (h->ident != sp->confid[cp->protoidx]) {
1571 if (debug)
1572 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1573 SPP_ARGS(ifp), cp->name,
1574 h->ident, sp->confid[cp->protoidx]);
1575 ++ifp->if_ierrors;
1576 break;
1577 }
1578 switch (sp->state[cp->protoidx]) {
1579 case STATE_CLOSED:
1580 case STATE_STOPPED:
1581 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1582 break;
1583 case STATE_CLOSING:
1584 case STATE_STOPPING:
1585 break;
1586 case STATE_REQ_SENT:
1587 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1588 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1589 break;
1590 case STATE_OPENED:
1591 (cp->tld)(sp);
1592 /* fall through */
1593 case STATE_ACK_RCVD:
1594 (cp->scr)(sp);
1595 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1596 break;
1597 case STATE_ACK_SENT:
1598 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1599 sppp_cp_change_state(cp, sp, STATE_OPENED);
1600 if (debug)
1601 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1602 SPP_ARGS(ifp), cp->name);
1603 (cp->tlu)(sp);
1604 break;
1605 default:
1606 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1607 SPP_ARGS(ifp), cp->name,
1608 sppp_cp_type_name(h->type),
1609 sppp_state_name(sp->state[cp->protoidx]));
1610 ++ifp->if_ierrors;
1611 }
1612 break;
1613 case CONF_NAK:
1614 case CONF_REJ:
1615 if (h->ident != sp->confid[cp->protoidx]) {
1616 if (debug)
1617 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1618 SPP_ARGS(ifp), cp->name,
1619 h->ident, sp->confid[cp->protoidx]);
1620 ++ifp->if_ierrors;
1621 break;
1622 }
1623 if (h->type == CONF_NAK)
1624 (cp->RCN_nak)(sp, h, len);
1625 else /* CONF_REJ */
1626 (cp->RCN_rej)(sp, h, len);
1627
1628 switch (sp->state[cp->protoidx]) {
1629 case STATE_CLOSED:
1630 case STATE_STOPPED:
1631 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1632 break;
1633 case STATE_REQ_SENT:
1634 case STATE_ACK_SENT:
1635 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1636 /*
1637 * Slow things down a bit if we think we might be
1638 * in loopback. Depend on the timeout to send the
1639 * next configuration request.
1640 */
1641 if (sp->pp_loopcnt)
1642 break;
1643 (cp->scr)(sp);
1644 break;
1645 case STATE_OPENED:
1646 (cp->tld)(sp);
1647 /* fall through */
1648 case STATE_ACK_RCVD:
1649 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1650 (cp->scr)(sp);
1651 break;
1652 case STATE_CLOSING:
1653 case STATE_STOPPING:
1654 break;
1655 default:
1656 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1657 SPP_ARGS(ifp), cp->name,
1658 sppp_cp_type_name(h->type),
1659 sppp_state_name(sp->state[cp->protoidx]));
1660 ++ifp->if_ierrors;
1661 }
1662 break;
1663
1664 case TERM_REQ:
1665 switch (sp->state[cp->protoidx]) {
1666 case STATE_ACK_RCVD:
1667 case STATE_ACK_SENT:
1668 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1669 /* fall through */
1670 case STATE_CLOSED:
1671 case STATE_STOPPED:
1672 case STATE_CLOSING:
1673 case STATE_STOPPING:
1674 case STATE_REQ_SENT:
1675 sta:
1676 /* Send Terminate-Ack packet. */
1677 if (debug)
1678 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1679 SPP_ARGS(ifp), cp->name);
1680 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1681 break;
1682 case STATE_OPENED:
1683 (cp->tld)(sp);
1684 sp->rst_counter[cp->protoidx] = 0;
1685 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1686 goto sta;
1687 break;
1688 default:
1689 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1690 SPP_ARGS(ifp), cp->name,
1691 sppp_cp_type_name(h->type),
1692 sppp_state_name(sp->state[cp->protoidx]));
1693 ++ifp->if_ierrors;
1694 }
1695 break;
1696 case TERM_ACK:
1697 switch (sp->state[cp->protoidx]) {
1698 case STATE_CLOSED:
1699 case STATE_STOPPED:
1700 case STATE_REQ_SENT:
1701 case STATE_ACK_SENT:
1702 break;
1703 case STATE_CLOSING:
1704 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1705 (cp->tlf)(sp);
1706 break;
1707 case STATE_STOPPING:
1708 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1709 (cp->tlf)(sp);
1710 break;
1711 case STATE_ACK_RCVD:
1712 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1713 break;
1714 case STATE_OPENED:
1715 (cp->tld)(sp);
1716 (cp->scr)(sp);
1717 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1718 break;
1719 default:
1720 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1721 SPP_ARGS(ifp), cp->name,
1722 sppp_cp_type_name(h->type),
1723 sppp_state_name(sp->state[cp->protoidx]));
1724 ++ifp->if_ierrors;
1725 }
1726 break;
1727 case CODE_REJ:
1728 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1729 log(LOG_INFO,
1730 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1731 "danger will robinson\n",
1732 SPP_ARGS(ifp), cp->name,
1733 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1734 switch (sp->state[cp->protoidx]) {
1735 case STATE_CLOSED:
1736 case STATE_STOPPED:
1737 case STATE_REQ_SENT:
1738 case STATE_ACK_SENT:
1739 case STATE_CLOSING:
1740 case STATE_STOPPING:
1741 case STATE_OPENED:
1742 break;
1743 case STATE_ACK_RCVD:
1744 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1745 break;
1746 default:
1747 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1748 SPP_ARGS(ifp), cp->name,
1749 sppp_cp_type_name(h->type),
1750 sppp_state_name(sp->state[cp->protoidx]));
1751 ++ifp->if_ierrors;
1752 }
1753 break;
1754 case PROTO_REJ:
1755 {
1756 int catastrophic;
1757 const struct cp *upper;
1758 int i;
1759 u_int16_t proto;
1760
1761 catastrophic = 0;
1762 upper = NULL;
1763 proto = ntohs(*((u_int16_t *)p));
1764 for (i = 0; i < IDX_COUNT; i++) {
1765 if (cps[i]->proto == proto) {
1766 upper = cps[i];
1767 break;
1768 }
1769 }
1770 if (upper == NULL)
1771 catastrophic++;
1772
1773 if (catastrophic || debug)
1774 log(catastrophic? LOG_INFO: LOG_DEBUG,
1775 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1776 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1777 sppp_cp_type_name(h->type), proto,
1778 upper ? upper->name : "unknown",
1779 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1780
1781 /*
1782 * if we got RXJ+ against conf-req, the peer does not implement
1783 * this particular protocol type. terminate the protocol.
1784 */
1785 if (upper && !catastrophic) {
1786 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1787 upper->Close(sp);
1788 break;
1789 }
1790 }
1791
1792 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1793 switch (sp->state[cp->protoidx]) {
1794 case STATE_CLOSED:
1795 case STATE_STOPPED:
1796 case STATE_REQ_SENT:
1797 case STATE_ACK_SENT:
1798 case STATE_CLOSING:
1799 case STATE_STOPPING:
1800 case STATE_OPENED:
1801 break;
1802 case STATE_ACK_RCVD:
1803 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1804 break;
1805 default:
1806 kprintf(SPP_FMT "%s illegal %s in state %s\n",
1807 SPP_ARGS(ifp), cp->name,
1808 sppp_cp_type_name(h->type),
1809 sppp_state_name(sp->state[cp->protoidx]));
1810 ++ifp->if_ierrors;
1811 }
1812 break;
1813 }
1814 case DISC_REQ:
1815 if (cp->proto != PPP_LCP)
1816 goto illegal;
1817 /* Discard the packet. */
1818 break;
1819 case ECHO_REQ:
1820 if (cp->proto != PPP_LCP)
1821 goto illegal;
1822 if (sp->state[cp->protoidx] != STATE_OPENED) {
1823 if (debug)
1824 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1825 SPP_ARGS(ifp));
1826 ++ifp->if_ierrors;
1827 break;
1828 }
1829 if (len < 8) {
1830 if (debug)
1831 log(-1, SPP_FMT "invalid lcp echo request "
1832 "packet length: %d bytes\n",
1833 SPP_ARGS(ifp), len);
1834 break;
1835 }
1836 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1837 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1838 /* Line loopback mode detected. */
1839 kprintf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1840 sp->pp_loopcnt = MAXALIVECNT * 5;
1841 if_down (ifp);
1842 IF_DRAIN(&sp->pp_cpq);
1843
1844 /* Shut down the PPP link. */
1845 /* XXX */
1846 lcp.Down(sp);
1847 lcp.Up(sp);
1848 break;
1849 }
1850 *(long*)(h+1) = htonl (sp->lcp.magic);
1851 if (debug)
1852 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1853 SPP_ARGS(ifp));
1854 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1855 break;
1856 case ECHO_REPLY:
1857 if (cp->proto != PPP_LCP)
1858 goto illegal;
1859 if (h->ident != sp->lcp.echoid) {
1860 ++ifp->if_ierrors;
1861 break;
1862 }
1863 if (len < 8) {
1864 if (debug)
1865 log(-1, SPP_FMT "lcp invalid echo reply "
1866 "packet length: %d bytes\n",
1867 SPP_ARGS(ifp), len);
1868 break;
1869 }
1870 if (debug)
1871 log(-1, SPP_FMT "lcp got echo rep\n",
1872 SPP_ARGS(ifp));
1873 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1874 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1875 sp->pp_alivecnt = 0;
1876 break;
1877 default:
1878 /* Unknown packet type -- send Code-Reject packet. */
1879 illegal:
1880 if (debug)
1881 log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1882 SPP_ARGS(ifp), cp->name, h->type);
1883 sppp_cp_send(sp, cp->proto, CODE_REJ,
1884 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1885 ++ifp->if_ierrors;
1886 }
1887 }
1888
1889
1890 /*
1891 * The generic part of all Up/Down/Open/Close/TO event handlers.
1892 * Basically, the state transition handling in the automaton.
1893 */
1894 static void
1895 sppp_up_event(const struct cp *cp, struct sppp *sp)
1896 {
1897 STDDCL;
1898
1899 if (debug)
1900 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1901 SPP_ARGS(ifp), cp->name,
1902 sppp_state_name(sp->state[cp->protoidx]));
1903
1904 switch (sp->state[cp->protoidx]) {
1905 case STATE_INITIAL:
1906 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1907 break;
1908 case STATE_STARTING:
1909 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1910 (cp->scr)(sp);
1911 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1912 break;
1913 default:
1914 kprintf(SPP_FMT "%s illegal up in state %s\n",
1915 SPP_ARGS(ifp), cp->name,
1916 sppp_state_name(sp->state[cp->protoidx]));
1917 }
1918 }
1919
1920 static void
1921 sppp_down_event(const struct cp *cp, struct sppp *sp)
1922 {
1923 STDDCL;
1924
1925 if (debug)
1926 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1927 SPP_ARGS(ifp), cp->name,
1928 sppp_state_name(sp->state[cp->protoidx]));
1929
1930 switch (sp->state[cp->protoidx]) {
1931 case STATE_CLOSED:
1932 case STATE_CLOSING:
1933 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1934 break;
1935 case STATE_STOPPED:
1936 sppp_cp_change_state(cp, sp, STATE_STARTING);
1937 (cp->tls)(sp);
1938 break;
1939 case STATE_STOPPING:
1940 case STATE_REQ_SENT:
1941 case STATE_ACK_RCVD:
1942 case STATE_ACK_SENT:
1943 sppp_cp_change_state(cp, sp, STATE_STARTING);
1944 break;
1945 case STATE_OPENED:
1946 (cp->tld)(sp);
1947 sppp_cp_change_state(cp, sp, STATE_STARTING);
1948 break;
1949 default:
1950 kprintf(SPP_FMT "%s illegal down in state %s\n",
1951 SPP_ARGS(ifp), cp->name,
1952 sppp_state_name(sp->state[cp->protoidx]));
1953 }
1954 }
1955
1956
1957 static void
1958 sppp_open_event(const struct cp *cp, struct sppp *sp)
1959 {
1960 STDDCL;
1961
1962 if (debug)
1963 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1964 SPP_ARGS(ifp), cp->name,
1965 sppp_state_name(sp->state[cp->protoidx]));
1966
1967 switch (sp->state[cp->protoidx]) {
1968 case STATE_INITIAL:
1969 sppp_cp_change_state(cp, sp, STATE_STARTING);
1970 (cp->tls)(sp);
1971 break;
1972 case STATE_STARTING:
1973 break;
1974 case STATE_CLOSED:
1975 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1976 (cp->scr)(sp);
1977 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1978 break;
1979 case STATE_STOPPED:
1980 /*
1981 * Try escaping stopped state. This seems to bite
1982 * people occasionally, in particular for IPCP,
1983 * presumably following previous IPCP negotiation
1984 * aborts. Somehow, we must have missed a Down event
1985 * which would have caused a transition into starting
1986 * state, so as a bandaid we force the Down event now.
1987 * This effectively implements (something like the)
1988 * `restart' option mentioned in the state transition
1989 * table of RFC 1661.
1990 */
1991 sppp_cp_change_state(cp, sp, STATE_STARTING);
1992 (cp->tls)(sp);
1993 break;
1994 case STATE_STOPPING:
1995 case STATE_REQ_SENT:
1996 case STATE_ACK_RCVD:
1997 case STATE_ACK_SENT:
1998 case STATE_OPENED:
1999 break;
2000 case STATE_CLOSING:
2001 sppp_cp_change_state(cp, sp, STATE_STOPPING);
2002 break;
2003 }
2004 }
2005
2006
2007 static void
2008 sppp_close_event(const struct cp *cp, struct sppp *sp)
2009 {
2010 STDDCL;
2011
2012 if (debug)
2013 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2014 SPP_ARGS(ifp), cp->name,
2015 sppp_state_name(sp->state[cp->protoidx]));
2016
2017 switch (sp->state[cp->protoidx]) {
2018 case STATE_INITIAL:
2019 case STATE_CLOSED:
2020 case STATE_CLOSING:
2021 break;
2022 case STATE_STARTING:
2023 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2024 (cp->tlf)(sp);
2025 break;
2026 case STATE_STOPPED:
2027 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2028 break;
2029 case STATE_STOPPING:
2030 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2031 break;
2032 case STATE_OPENED:
2033 (cp->tld)(sp);
2034 /* fall through */
2035 case STATE_REQ_SENT:
2036 case STATE_ACK_RCVD:
2037 case STATE_ACK_SENT:
2038 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2039 sppp_cp_send(sp, cp->proto, TERM_REQ,
2040 ++sp->pp_seq[cp->protoidx], 0, 0);
2041 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2042 break;
2043 }
2044 }
2045
2046 static void
2047 sppp_to_event(const struct cp *cp, struct sppp *sp)
2048 {
2049 STDDCL;
2050
2051 crit_enter();
2052
2053 if (debug)
2054 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2055 SPP_ARGS(ifp), cp->name,
2056 sppp_state_name(sp->state[cp->protoidx]),
2057 sp->rst_counter[cp->protoidx]);
2058
2059 if (--sp->rst_counter[cp->protoidx] < 0)
2060 /* TO- event */
2061 switch (sp->state[cp->protoidx]) {
2062 case STATE_CLOSING:
2063 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2064 (cp->tlf)(sp);
2065 break;
2066 case STATE_STOPPING:
2067 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2068 (cp->tlf)(sp);
2069 break;
2070 case STATE_REQ_SENT:
2071 case STATE_ACK_RCVD:
2072 case STATE_ACK_SENT:
2073 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2074 (cp->tlf)(sp);
2075 break;
2076 }
2077 else
2078 /* TO+ event */
2079 switch (sp->state[cp->protoidx]) {
2080 case STATE_CLOSING:
2081 case STATE_STOPPING:
2082 sppp_cp_send(sp, cp->proto, TERM_REQ,
2083 ++sp->pp_seq[cp->protoidx], 0, 0);
2084 callout_reset(&sp->timeout[cp->protoidx],
2085 sp->lcp.timeout, cp->TO, sp);
2086 break;
2087 case STATE_REQ_SENT:
2088 case STATE_ACK_RCVD:
2089 (cp->scr)(sp);
2090 /* sppp_cp_change_state() will restart the timer */
2091 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2092 break;
2093 case STATE_ACK_SENT:
2094 (cp->scr)(sp);
2095 callout_reset(&sp->timeout[cp->protoidx],
2096 sp->lcp.timeout, cp->TO, sp);
2097 break;
2098 }
2099
2100 crit_exit();
2101 }
2102
2103 /*
2104 * Change the state of a control protocol in the state automaton.
2105 * Takes care of starting/stopping the restart timer.
2106 */
2107 void
2108 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2109 {
2110 sp->state[cp->protoidx] = newstate;
2111 callout_stop(&sp->timeout[cp->protoidx]);
2112
2113 switch (newstate) {
2114 case STATE_INITIAL:
2115 case STATE_STARTING:
2116 case STATE_CLOSED:
2117 case STATE_STOPPED:
2118 case STATE_OPENED:
2119 break;
2120 case STATE_CLOSING:
2121 case STATE_STOPPING:
2122 case STATE_REQ_SENT:
2123 case STATE_ACK_RCVD:
2124 case STATE_ACK_SENT:
2125 callout_reset(&sp->timeout[cp->protoidx],
2126 sp->lcp.timeout, cp->TO, sp);
2127 break;
2128 }
2129 }
2130
2131 /*
2132 *--------------------------------------------------------------------------*
2133 * *
2134 * The LCP implementation. *
2135 * *
2136 *--------------------------------------------------------------------------*
2137 */
2138 static void
2139 sppp_lcp_init(struct sppp *sp)
2140 {
2141 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2142 sp->lcp.magic = 0;
2143 sp->state[IDX_LCP] = STATE_INITIAL;
2144 sp->fail_counter[IDX_LCP] = 0;
2145 sp->pp_seq[IDX_LCP] = 0;
2146 sp->pp_rseq[IDX_LCP] = 0;
2147 sp->lcp.protos = 0;
2148 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2149
2150 /* Note that these values are relevant for all control protocols */
2151 sp->lcp.timeout = 3 * hz;
2152 sp->lcp.max_terminate = 2;
2153 sp->lcp.max_configure = 10;
2154 sp->lcp.max_failure = 10;
2155 #if defined(__DragonFly__)
2156 callout_init(&sp->timeout[IDX_LCP]);
2157 #endif
2158 }
2159
2160 static void
2161 sppp_lcp_up(struct sppp *sp)
2162 {
2163 STDDCL;
2164
2165 sp->pp_alivecnt = 0;
2166 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2167 sp->lcp.magic = 0;
2168 sp->lcp.protos = 0;
2169 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2170 /*
2171 * If this interface is passive or dial-on-demand, and we are
2172 * still in Initial state, it means we've got an incoming
2173 * call. Activate the interface.
2174 */
2175 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2176 if (debug)
2177 log(LOG_DEBUG,
2178 SPP_FMT "Up event", SPP_ARGS(ifp));
2179 ifp->if_flags |= IFF_RUNNING;
2180 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2181 if (debug)
2182 log(-1, "(incoming call)\n");
2183 sp->pp_flags |= PP_CALLIN;
2184 lcp.Open(sp);
2185 } else if (debug)
2186 log(-1, "\n");
2187 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2188 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2189 ifp->if_flags |= IFF_RUNNING;
2190 lcp.Open(sp);
2191 }
2192
2193 sppp_up_event(&lcp, sp);
2194 }
2195
2196 static void
2197 sppp_lcp_down(struct sppp *sp)
2198 {
2199 STDDCL;
2200
2201 sppp_down_event(&lcp, sp);
2202
2203 /*
2204 * If this is neither a dial-on-demand nor a passive
2205 * interface, simulate an ``ifconfig down'' action, so the
2206 * administrator can force a redial by another ``ifconfig
2207 * up''. XXX For leased line operation, should we immediately
2208 * try to reopen the connection here?
2209 */
2210 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2211 log(LOG_INFO,
2212 SPP_FMT "Down event, taking interface down.\n",
2213 SPP_ARGS(ifp));
2214 if_down(ifp);
2215 } else {
2216 if (debug)
2217 log(LOG_DEBUG,
2218 SPP_FMT "Down event (carrier loss)\n",
2219 SPP_ARGS(ifp));
2220 sp->pp_flags &= ~PP_CALLIN;
2221 if (sp->state[IDX_LCP] != STATE_INITIAL)
2222 lcp.Close(sp);
2223 ifp->if_flags &= ~IFF_RUNNING;
2224 }
2225 }
2226
2227 static void
2228 sppp_lcp_open(struct sppp *sp)
2229 {
2230 /*
2231 * If we are authenticator, negotiate LCP_AUTH
2232 */
2233 if (sp->hisauth.proto != 0)
2234 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2235 else
2236 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2237 sp->pp_flags &= ~PP_NEEDAUTH;
2238 sppp_open_event(&lcp, sp);
2239 }
2240
2241 static void
2242 sppp_lcp_close(struct sppp *sp)
2243 {
2244 sppp_close_event(&lcp, sp);
2245 }
2246
2247 static void
2248 sppp_lcp_TO(void *cookie)
2249 {
2250 sppp_to_event(&lcp, (struct sppp *)cookie);
2251 }
2252
2253 /*
2254 * Analyze a configure request. Return true if it was agreeable, and
2255 * caused action sca, false if it has been rejected or nak'ed, and
2256 * caused action scn. (The return value is used to make the state
2257 * transition decision in the state automaton.)
2258 */
2259 static int
2260 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2261 {
2262 STDDCL;
2263 u_char *buf, *r, *p;
2264 int origlen, rlen;
2265 u_long nmagic;
2266 u_short authproto;
2267
2268 len -= 4;
2269 origlen = len;
2270 buf = r = kmalloc (len, M_TEMP, M_INTWAIT);
2271
2272 if (debug)
2273 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2274 SPP_ARGS(ifp));
2275
2276 /* pass 1: check for things that need to be rejected */
2277 p = (void*) (h+1);
2278 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2279 /* Sanity check option length */
2280 if (p[1] > len) {
2281 /* Malicious option - drop immediately.
2282 * XXX Maybe we should just RXJ it?
2283 */
2284 log(-1, "%s: received malicious LCP option 0x%02x, "
2285 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2286 p[0], p[1], len);
2287 goto drop;
2288 }
2289 if (debug)
2290 log(-1, " %s ", sppp_lcp_opt_name(*p));
2291 switch (*p) {
2292 case LCP_OPT_MAGIC:
2293 /* Magic number. */
2294 if (len >= 6 && p[1] == 6)
2295 continue;
2296 if (debug)
2297 log(-1, "[invalid] ");
2298 break;
2299 case LCP_OPT_ASYNC_MAP:
2300 /* Async control character map. */
2301 if (len >= 6 && p[1] == 6)
2302 continue;
2303 if (debug)
2304 log(-1, "[invalid] ");
2305 break;
2306 case LCP_OPT_MRU:
2307 /* Maximum receive unit. */
2308 if (len >= 4 && p[1] == 4)
2309 continue;
2310 if (debug)
2311 log(-1, "[invalid] ");
2312 break;
2313 case LCP_OPT_AUTH_PROTO:
2314 if (len < 4) {
2315 if (debug)
2316 log(-1, "[invalid] ");
2317 break;
2318 }
2319 authproto = (p[2] << 8) + p[3];
2320 if (authproto == PPP_CHAP && p[1] != 5) {
2321 if (debug)
2322 log(-1, "[invalid chap len] ");
2323 break;
2324 }
2325 if (sp->myauth.proto == 0) {
2326 /* we are not configured to do auth */
2327 if (debug)
2328 log(-1, "[not configured] ");
2329 break;
2330 }
2331 /*
2332 * Remote want us to authenticate, remember this,
2333 * so we stay in PHASE_AUTHENTICATE after LCP got
2334 * up.
2335 */
2336 sp->pp_flags |= PP_NEEDAUTH;
2337 continue;
2338 default:
2339 /* Others not supported. */
2340 if (debug)
2341 log(-1, "[rej] ");
2342 break;
2343 }
2344 /* Add the option to rejected list. */
2345 bcopy (p, r, p[1]);
2346 r += p[1];
2347 rlen += p[1];
2348 }
2349 if (rlen) {
2350 if (debug)
2351 log(-1, " send conf-rej\n");
2352 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2353 return 0;
2354 } else if (debug)
2355 log(-1, "\n");
2356
2357 /*
2358 * pass 2: check for option values that are unacceptable and
2359 * thus require to be nak'ed.
2360 */
2361 if (debug)
2362 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2363 SPP_ARGS(ifp));
2364
2365 p = (void*) (h+1);
2366 len = origlen;
2367 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2368 if (debug)
2369 log(-1, " %s ", sppp_lcp_opt_name(*p));
2370 switch (*p) {
2371 case LCP_OPT_MAGIC:
2372 /* Magic number -- extract. */
2373 nmagic = (u_long)p[2] << 24 |
2374 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2375 if (nmagic != sp->lcp.magic) {
2376 sp->pp_loopcnt = 0;
2377 if (debug)
2378 log(-1, "0x%lx ", nmagic);
2379 continue;
2380 }
2381 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2382 log(-1, "[glitch] ");
2383 ++sp->pp_loopcnt;
2384 /*
2385 * We negate our magic here, and NAK it. If
2386 * we see it later in an NAK packet, we
2387 * suggest a new one.
2388 */
2389 nmagic = ~sp->lcp.magic;
2390 /* Gonna NAK it. */
2391 p[2] = nmagic >> 24;
2392 p[3] = nmagic >> 16;
2393 p[4] = nmagic >> 8;
2394 p[5] = nmagic;
2395 break;
2396
2397 case LCP_OPT_ASYNC_MAP:
2398 /*
2399 * Async control character map -- just ignore it.
2400 *
2401 * Quote from RFC 1662, chapter 6:
2402 * To enable this functionality, synchronous PPP
2403 * implementations MUST always respond to the
2404 * Async-Control-Character-Map Configuration
2405 * Option with the LCP Configure-Ack. However,
2406 * acceptance of the Configuration Option does
2407 * not imply that the synchronous implementation
2408 * will do any ACCM mapping. Instead, all such
2409 * octet mapping will be performed by the
2410 * asynchronous-to-synchronous converter.
2411 */
2412 continue;
2413
2414 case LCP_OPT_MRU:
2415 /*
2416 * Maximum receive unit. Always agreeable,
2417 * but ignored by now.
2418 */
2419 sp->lcp.their_mru = p[2] * 256 + p[3];
2420 if (debug)
2421 log(-1, "%lu ", sp->lcp.their_mru);
2422 continue;
2423
2424 case LCP_OPT_AUTH_PROTO:
2425 authproto = (p[2] << 8) + p[3];
2426 if (sp->myauth.proto != authproto) {
2427 /* not agreed, nak */
2428 if (debug)
2429 log(-1, "[mine %s != his %s] ",
2430 sppp_proto_name(sp->hisauth.proto),
2431 sppp_proto_name(authproto));
2432 p[2] = sp->myauth.proto >> 8;
2433 p[3] = sp->myauth.proto;
2434 break;
2435 }
2436 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2437 if (debug)
2438 log(-1, "[chap not MD5] ");
2439 p[4] = CHAP_MD5;
2440 break;
2441 }
2442 continue;
2443 }
2444 /* Add the option to nak'ed list. */
2445 bcopy (p, r, p[1]);
2446 r += p[1];
2447 rlen += p[1];
2448 }
2449 if (rlen) {
2450 /*
2451 * Local and remote magics equal -- loopback?
2452 */
2453 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2454 if (sp->pp_loopcnt == MAXALIVECNT*5)
2455 kprintf (SPP_FMT "loopback\n",
2456 SPP_ARGS(ifp));
2457 if (ifp->if_flags & IFF_UP) {
2458 if_down(ifp);
2459 IF_DRAIN(&sp->pp_cpq);
2460 /* XXX ? */
2461 lcp.Down(sp);
2462 lcp.Up(sp);
2463 }
2464 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2465 if (debug)
2466 log(-1, " max_failure (%d) exceeded, "
2467 "send conf-rej\n",
2468 sp->lcp.max_failure);
2469 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2470 } else {
2471 if (debug)
2472 log(-1, " send conf-nak\n");
2473 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2474 }
2475 } else {
2476 if (debug)
2477 log(-1, " send conf-ack\n");
2478 sp->fail_counter[IDX_LCP] = 0;
2479 sp->pp_loopcnt = 0;
2480 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2481 h->ident, origlen, h+1);
2482 }
2483
2484 kfree (buf, M_TEMP);
2485 return (rlen == 0);
2486
2487 drop:
2488 kfree(buf, M_TEMP);
2489 return (-1);
2490 }
2491
2492 /*
2493 * Analyze the LCP Configure-Reject option list, and adjust our
2494 * negotiation.
2495 */
2496 static void
2497 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2498 {
2499 STDDCL;
2500 u_char *buf, *p;
2501
2502 len -= 4;
2503 buf = kmalloc (len, M_TEMP, M_INTWAIT);
2504
2505 if (debug)
2506 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2507 SPP_ARGS(ifp));
2508
2509 p = (void*) (h+1);
2510 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2511 /* Sanity check option length */
2512 if (p[1] > len) {
2513 /*
2514 * Malicious option - drop immediately.
2515 * XXX Maybe we should just RXJ it?
2516 */
2517 log(-1, "%s: received malicious LCP option, "
2518 "dropping.\n", ifp->if_xname);
2519 goto drop;
2520 }
2521 if (debug)
2522 log(-1, " %s ", sppp_lcp_opt_name(*p));
2523 switch (*p) {
2524 case LCP_OPT_MAGIC:
2525 /* Magic number -- can't use it, use 0 */
2526 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2527 sp->lcp.magic = 0;
2528 break;
2529 case LCP_OPT_MRU:
2530 /*
2531 * Should not be rejected anyway, since we only
2532 * negotiate a MRU if explicitly requested by
2533 * peer.
2534 */
2535 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2536 break;
2537 case LCP_OPT_AUTH_PROTO:
2538 /*
2539 * Peer doesn't want to authenticate himself,
2540 * deny unless this is a dialout call, and
2541 * AUTHFLAG_NOCALLOUT is set.
2542 */
2543 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2544 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2545 if (debug)
2546 log(-1, "[don't insist on auth "
2547 "for callout]");
2548 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2549 break;
2550 }
2551 if (debug)
2552 log(-1, "[access denied]\n");
2553 lcp.Close(sp);
2554 break;
2555 }
2556 }
2557 if (debug)
2558 log(-1, "\n");
2559 drop:
2560 kfree (buf, M_TEMP);
2561 return;
2562 }
2563
2564 /*
2565 * Analyze the LCP Configure-NAK option list, and adjust our
2566 * negotiation.
2567 */
2568 static void
2569 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2570 {
2571 STDDCL;
2572 u_char *buf, *p;
2573 u_long magic;
2574
2575 len -= 4;
2576 buf = kmalloc (len, M_TEMP, M_INTWAIT);
2577
2578 if (debug)
2579 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2580 SPP_ARGS(ifp));
2581
2582 p = (void*) (h+1);
2583 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2584 /* Sanity check option length */
2585 if (p[1] > len) {
2586 /*
2587 * Malicious option - drop immediately.
2588 * XXX Maybe we should just RXJ it?
2589 */
2590 log(-1, "%s: received malicious LCP option, "
2591 "dropping.\n", ifp->if_xname);
2592 goto drop;
2593 }
2594 if (debug)
2595 log(-1, " %s ", sppp_lcp_opt_name(*p));
2596 switch (*p) {
2597 case LCP_OPT_MAGIC:
2598 /* Magic number -- renegotiate */
2599 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2600 len >= 6 && p[1] == 6) {
2601 magic = (u_long)p[2] << 24 |
2602 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2603 /*
2604 * If the remote magic is our negated one,
2605 * this looks like a loopback problem.
2606 * Suggest a new magic to make sure.
2607 */
2608 if (magic == ~sp->lcp.magic) {
2609 if (debug)
2610 log(-1, "magic glitch ");
2611 #if defined(__DragonFly__)
2612 sp->lcp.magic = krandom();
2613 #else
2614 sp->lcp.magic = time.tv_sec + time.tv_usec;
2615 #endif
2616 } else {
2617 sp->lcp.magic = magic;
2618 if (debug)
2619 log(-1, "%lu ", magic);
2620 }
2621 }
2622 break;
2623 case LCP_OPT_MRU:
2624 /*
2625 * Peer wants to advise us to negotiate an MRU.
2626 * Agree on it if it's reasonable, or use
2627 * default otherwise.
2628 */
2629 if (len >= 4 && p[1] == 4) {
2630 u_int mru = p[2] * 256 + p[3];
2631 if (debug)
2632 log(-1, "%d ", mru);
2633 if (mru < PP_MTU || mru > PP_MAX_MRU)
2634 mru = PP_MTU;
2635 sp->lcp.mru = mru;
2636 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2637 }
2638 break;
2639 case LCP_OPT_AUTH_PROTO:
2640 /*
2641 * Peer doesn't like our authentication method,
2642 * deny.
2643 */
2644 if (debug)
2645 log(-1, "[access denied]\n");
2646 lcp.Close(sp);
2647 break;
2648 }
2649 }
2650 if (debug)
2651 log(-1, "\n");
2652 drop:
2653 kfree (buf, M_TEMP);
2654 return;
2655 }
2656
2657 static void
2658 sppp_lcp_tlu(struct sppp *sp)
2659 {
2660 STDDCL;
2661 int i;
2662 u_long mask;
2663
2664 /* XXX ? */
2665 if (! (ifp->if_flags & IFF_UP) &&
2666 (ifp->if_flags & IFF_RUNNING)) {
2667 /* Coming out of loopback mode. */
2668 if_up(ifp);
2669 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
2670 }
2671
2672 for (i = 0; i < IDX_COUNT; i++)
2673 if ((cps[i])->flags & CP_QUAL)
2674 (cps[i])->Open(sp);
2675
2676 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2677 (sp->pp_flags & PP_NEEDAUTH) != 0)
2678 sp->pp_phase = PHASE_AUTHENTICATE;
2679 else
2680 sp->pp_phase = PHASE_NETWORK;
2681
2682 if (debug)
2683 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2684 sppp_phase_name(sp->pp_phase));
2685
2686 /*
2687 * Open all authentication protocols. This is even required
2688 * if we already proceeded to network phase, since it might be
2689 * that remote wants us to authenticate, so we might have to
2690 * send a PAP request. Undesired authentication protocols
2691 * don't do anything when they get an Open event.
2692 */
2693 for (i = 0; i < IDX_COUNT; i++)
2694 if ((cps[i])->flags & CP_AUTH)
2695 (cps[i])->Open(sp);
2696
2697 if (sp->pp_phase == PHASE_NETWORK) {
2698 /* Notify all NCPs. */
2699 for (i = 0; i < IDX_COUNT; i++)
2700 if (((cps[i])->flags & CP_NCP) &&
2701 /*
2702 * XXX
2703 * Hack to administratively disable IPv6 if
2704 * not desired. Perhaps we should have another
2705 * flag for this, but right now, we can make
2706 * all struct cp's read/only.
2707 */
2708 (cps[i] != &ipv6cp ||
2709 (sp->confflags & CONF_ENABLE_IPV6)))
2710 (cps[i])->Open(sp);
2711 }
2712
2713 /* Send Up events to all started protos. */
2714 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2715 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2716 (cps[i])->Up(sp);
2717
2718 /* notify low-level driver of state change */
2719 if (sp->pp_chg)
2720 sp->pp_chg(sp, (int)sp->pp_phase);
2721
2722 if (sp->pp_phase == PHASE_NETWORK)
2723 /* if no NCP is starting, close down */
2724 sppp_lcp_check_and_close(sp);
2725 }
2726
2727 static void
2728 sppp_lcp_tld(struct sppp *sp)
2729 {
2730 STDDCL;
2731 int i;
2732 u_long mask;
2733
2734 sp->pp_phase = PHASE_TERMINATE;
2735
2736 if (debug)
2737 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2738 sppp_phase_name(sp->pp_phase));
2739
2740 /*
2741 * Take upper layers down. We send the Down event first and
2742 * the Close second to prevent the upper layers from sending
2743 * ``a flurry of terminate-request packets'', as the RFC
2744 * describes it.
2745 */
2746 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2747 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2748 (cps[i])->Down(sp);
2749 (cps[i])->Close(sp);
2750 }
2751 }
2752
2753 static void
2754 sppp_lcp_tls(struct sppp *sp)
2755 {
2756 STDDCL;
2757
2758 sp->pp_phase = PHASE_ESTABLISH;
2759
2760 if (debug)
2761 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2762 sppp_phase_name(sp->pp_phase));
2763
2764 /* Notify lower layer if desired. */
2765 if (sp->pp_tls)
2766 (sp->pp_tls)(sp);
2767 else
2768 (sp->pp_up)(sp);
2769 }
2770
2771 static void
2772 sppp_lcp_tlf(struct sppp *sp)
2773 {
2774 STDDCL;
2775
2776 sp->pp_phase = PHASE_DEAD;
2777 if (debug)
2778 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2779 sppp_phase_name(sp->pp_phase));
2780
2781 /* Notify lower layer if desired. */
2782 if (sp->pp_tlf)
2783 (sp->pp_tlf)(sp);
2784 else
2785 (sp->pp_down)(sp);
2786 }
2787
2788 static void
2789 sppp_lcp_scr(struct sppp *sp)
2790 {
2791 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2792 int i = 0;
2793 u_short authproto;
2794
2795 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2796 if (! sp->lcp.magic)
2797 #if defined(__DragonFly__)
2798 sp->lcp.magic = krandom();
2799 #else
2800 sp->lcp.magic = time.tv_sec + time.tv_usec;
2801 #endif
2802 opt[i++] = LCP_OPT_MAGIC;
2803 opt[i++] = 6;
2804 opt[i++] = sp->lcp.magic >> 24;
2805 opt[i++] = sp->lcp.magic >> 16;
2806 opt[i++] = sp->lcp.magic >> 8;
2807 opt[i++] = sp->lcp.magic;
2808 }
2809
2810 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2811 opt[i++] = LCP_OPT_MRU;
2812 opt[i++] = 4;
2813 opt[i++] = sp->lcp.mru >> 8;
2814 opt[i++] = sp->lcp.mru;
2815 }
2816
2817 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2818 authproto = sp->hisauth.proto;
2819 opt[i++] = LCP_OPT_AUTH_PROTO;
2820 opt[i++] = authproto == PPP_CHAP? 5: 4;
2821 opt[i++] = authproto >> 8;
2822 opt[i++] = authproto;
2823 if (authproto == PPP_CHAP)
2824 opt[i++] = CHAP_MD5;
2825 }
2826
2827 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2828 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2829 }
2830
2831 /*
2832 * Check the open NCPs, return true if at least one NCP is open.
2833 */
2834 static int
2835 sppp_ncp_check(struct sppp *sp)
2836 {
2837 int i, mask;
2838
2839 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2840 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2841 return 1;
2842 return 0;
2843 }
2844
2845 /*
2846 * Re-check the open NCPs and see if we should terminate the link.
2847 * Called by the NCPs during their tlf action handling.
2848 */
2849 static void
2850 sppp_lcp_check_and_close(struct sppp *sp)
2851 {
2852
2853 if (sp->pp_phase < PHASE_NETWORK)
2854 /* don't bother, we are already going down */
2855 return;
2856
2857 if (sppp_ncp_check(sp))
2858 return;
2859
2860 lcp.Close(sp);
2861 }
2862
2863 /*
2864 *--------------------------------------------------------------------------*
2865 * *
2866 * The IPCP implementation. *
2867 * *
2868 *--------------------------------------------------------------------------*
2869 */
2870
2871 static void
2872 sppp_ipcp_init(struct sppp *sp)
2873 {
2874 sp->ipcp.opts = 0;
2875 sp->ipcp.flags = 0;
2876 sp->state[IDX_IPCP] = STATE_INITIAL;
2877 sp->fail_counter[IDX_IPCP] = 0;
2878 sp->pp_seq[IDX_IPCP] = 0;
2879 sp->pp_rseq[IDX_IPCP] = 0;
2880 #if defined(__DragonFly__)
2881 callout_init(&sp->timeout[IDX_IPCP]);
2882 #endif
2883 }
2884
2885 static void
2886 sppp_ipcp_up(struct sppp *sp)
2887 {
2888 sppp_up_event(&ipcp, sp);
2889 }
2890
2891 static void
2892 sppp_ipcp_down(struct sppp *sp)
2893 {
2894 sppp_down_event(&ipcp, sp);
2895 }
2896
2897 static void
2898 sppp_ipcp_open(struct sppp *sp)
2899 {
2900 STDDCL;
2901 u_long myaddr, hisaddr;
2902
2903 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2904 IPCP_MYADDR_DYN | IPCP_VJ);
2905 sp->ipcp.opts = 0;
2906
2907 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2908 /*
2909 * If we don't have his address, this probably means our
2910 * interface doesn't want to talk IP at all. (This could
2911 * be the case if somebody wants to speak only IPX, for
2912 * example.) Don't open IPCP in this case.
2913 */
2914 if (hisaddr == 0L) {
2915 /* XXX this message should go away */
2916 if (debug)
2917 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2918 SPP_ARGS(ifp));
2919 return;
2920 }
2921 if (myaddr == 0L) {
2922 /*
2923 * I don't have an assigned address, so i need to
2924 * negotiate my address.
2925 */
2926 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2927 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2928 } else
2929 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2930 if (sp->confflags & CONF_ENABLE_VJ) {
2931 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2932 sp->ipcp.max_state = MAX_STATES - 1;
2933 sp->ipcp.compress_cid = 1;
2934 }
2935 sppp_open_event(&ipcp, sp);
2936 }
2937
2938 static void
2939 sppp_ipcp_close(struct sppp *sp)
2940 {
2941 sppp_close_event(&ipcp, sp);
2942 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2943 /*
2944 * My address was dynamic, clear it again.
2945 */
2946 sppp_set_ip_addr(sp, 0L);
2947 }
2948
2949 static void
2950 sppp_ipcp_TO(void *cookie)
2951 {
2952 sppp_to_event(&ipcp, (struct sppp *)cookie);
2953 }
2954
2955 /*
2956 * Analyze a configure request. Return true if it was agreeable, and
2957 * caused action sca, false if it has been rejected or nak'ed, and
2958 * caused action scn. (The return value is used to make the state
2959 * transition decision in the state automaton.)
2960 */
2961 static int
2962 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2963 {
2964 u_char *buf, *r, *p;
2965 struct ifnet *ifp = &sp->pp_if;
2966 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2967 u_long hisaddr, desiredaddr;
2968 int gotmyaddr = 0;
2969 int desiredcomp;
2970
2971 len -= 4;
2972 origlen = len;
2973 /*
2974 * Make sure to allocate a buf that can at least hold a
2975 * conf-nak with an `address' option. We might need it below.
2976 */
2977 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2978
2979 /* pass 1: see if we can recognize them */
2980 if (debug)
2981 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2982 SPP_ARGS(ifp));
2983 p = (void*) (h+1);
2984 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2985 /* Sanity check option length */
2986 if (p[1] > len) {
2987 /* XXX should we just RXJ? */
2988 log(-1, "%s: malicious IPCP option received, dropping\n",
2989 ifp->if_xname);
2990 goto drop;
2991 }
2992 if (debug)
2993 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2994 switch (*p) {
2995 case IPCP_OPT_COMPRESSION:
2996 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2997 /* VJ compression administratively disabled */
2998 if (debug)
2999 log(-1, "[locally disabled] ");
3000 break;
3001 }
3002 /*
3003 * In theory, we should only conf-rej an
3004 * option that is shorter than RFC 1618
3005 * requires (i.e. < 4), and should conf-nak
3006 * anything else that is not VJ. However,
3007 * since our algorithm always uses the
3008 * original option to NAK it with new values,
3009 * things would become more complicated. In
3010 * pratice, the only commonly implemented IP
3011 * compression option is VJ anyway, so the
3012 * difference is negligible.
3013 */
3014 if (len >= 6 && p[1] == 6) {
3015 /*
3016 * correctly formed compression option
3017 * that could be VJ compression
3018 */
3019 continue;
3020 }
3021 if (debug)
3022 log(-1, "optlen %d [invalid/unsupported] ",
3023 p[1]);
3024 break;
3025 case IPCP_OPT_ADDRESS:
3026 if (len >= 6 && p[1] == 6) {
3027 /* correctly formed address option */
3028 continue;
3029 }
3030 if (debug)
3031 log(-1, "[invalid] ");
3032 break;
3033 default:
3034 /* Others not supported. */
3035 if (debug)
3036 log(-1, "[rej] ");
3037 break;
3038 }
3039 /* Add the option to rejected list. */
3040 bcopy (p, r, p[1]);
3041 r += p[1];
3042 rlen += p[1];
3043 }
3044 if (rlen) {
3045 if (debug)
3046 log(-1, " send conf-rej\n");
3047 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3048 return 0;
3049 } else if (debug)
3050 log(-1, "\n");
3051
3052 /* pass 2: parse option values */
3053 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3054 if (debug)
3055 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3056 SPP_ARGS(ifp));
3057 p = (void*) (h+1);
3058 len = origlen;
3059 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3060 if (debug)
3061 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3062 switch (*p) {
3063 case IPCP_OPT_COMPRESSION:
3064 desiredcomp = p[2] << 8 | p[3];
3065 /* We only support VJ */
3066 if (desiredcomp == IPCP_COMP_VJ) {
3067 if (debug)
3068 log(-1, "VJ [ack] ");
3069 sp->ipcp.flags |= IPCP_VJ;
3070 sl_compress_init(sp->pp_comp, p[4]);
3071 sp->ipcp.max_state = p[4];
3072 sp->ipcp.compress_cid = p[5];
3073 continue;
3074 }
3075 if (debug)
3076 log(-1, "compproto %#04x [not supported] ",
3077 desiredcomp);
3078 p[2] = IPCP_COMP_VJ >> 8;
3079 p[3] = IPCP_COMP_VJ;
3080 p[4] = sp->ipcp.max_state;
3081 p[5] = sp->ipcp.compress_cid;
3082 break;
3083 case IPCP_OPT_ADDRESS:
3084 /* This is the address he wants in his end */
3085 desiredaddr = p[2] << 24 | p[3] << 16 |
3086 p[4] << 8 | p[5];
3087 if (desiredaddr == hisaddr ||
3088 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3089 /*
3090 * Peer's address is same as our value,
3091 * or we have set it to 0.0.0.* to
3092 * indicate that we do not really care,
3093 * this is agreeable. Gonna conf-ack
3094 * it.
3095 */
3096 if (debug)
3097 log(-1, "%s [ack] ",
3098 sppp_dotted_quad(hisaddr));
3099 /* record that we've seen it already */
3100 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3101 continue;
3102 }
3103 /*
3104 * The address wasn't agreeable. This is either
3105 * he sent us 0.0.0.0, asking to assign him an
3106 * address, or he send us another address not
3107 * matching our value. Either case, we gonna
3108 * conf-nak it with our value.
3109 * XXX: we should "rej" if hisaddr == 0
3110 */
3111 if (debug) {
3112 if (desiredaddr == 0)
3113 log(-1, "[addr requested] ");
3114 else
3115 log(-1, "%s [not agreed] ",
3116 sppp_dotted_quad(desiredaddr));
3117
3118 }
3119 p[2] = hisaddr >> 24;
3120 p[3] = hisaddr >> 16;
3121 p[4] = hisaddr >> 8;
3122 p[5] = hisaddr;
3123 break;
3124 }
3125 /* Add the option to nak'ed list. */
3126 bcopy (p, r, p[1]);
3127 r += p[1];
3128 rlen += p[1];
3129 }
3130
3131 /*
3132 * If we are about to conf-ack the request, but haven't seen
3133 * his address so far, gonna conf-nak it instead, with the
3134 * `address' option present and our idea of his address being
3135 * filled in there, to request negotiation of both addresses.
3136 *
3137 * XXX This can result in an endless req - nak loop if peer
3138 * doesn't want to send us his address. Q: What should we do
3139 * about it? XXX A: implement the max-failure counter.
3140 */
3141 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3142 buf[0] = IPCP_OPT_ADDRESS;
3143 buf[1] = 6;
3144 buf[2] = hisaddr >> 24;
3145 buf[3] = hisaddr >> 16;
3146 buf[4] = hisaddr >> 8;
3147 buf[5] = hisaddr;
3148 rlen = 6;
3149 if (debug)
3150 log(-1, "still need hisaddr ");
3151 }
3152
3153 if (rlen) {
3154 if (debug)
3155 log(-1, " send conf-nak\n");
3156 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3157 } else {
3158 if (debug)
3159 log(-1, " send conf-ack\n");
3160 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3161 h->ident, origlen, h+1);
3162 }
3163
3164 kfree (buf, M_TEMP);
3165 return (rlen == 0);
3166
3167 drop:
3168 kfree(buf, M_TEMP);
3169 return (-1);
3170 }
3171
3172 /*
3173 * Analyze the IPCP Configure-Reject option list, and adjust our
3174 * negotiation.
3175 */
3176 static void
3177 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3178 {
3179 u_char *buf, *p;
3180 struct ifnet *ifp = &sp->pp_if;
3181 int debug = ifp->if_flags & IFF_DEBUG;
3182
3183 len -= 4;
3184 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3185
3186 if (debug)
3187 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3188 SPP_ARGS(ifp));
3189
3190 p = (void*) (h+1);
3191 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3192 /* Sanity check option length */
3193 if (p[1] > len) {
3194 /* XXX should we just RXJ? */
3195 log(-1, "%s: malicious IPCP option received, dropping\n",
3196 ifp->if_xname);
3197 goto drop;
3198 }
3199 if (debug)
3200 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3201 switch (*p) {
3202 case IPCP_OPT_COMPRESSION:
3203 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3204 break;
3205 case IPCP_OPT_ADDRESS:
3206 /*
3207 * Peer doesn't grok address option. This is
3208 * bad. XXX Should we better give up here?
3209 * XXX We could try old "addresses" option...
3210 */
3211 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3212 break;
3213 }
3214 }
3215 if (debug)
3216 log(-1, "\n");
3217 drop:
3218 kfree (buf, M_TEMP);
3219 return;
3220 }
3221
3222 /*
3223 * Analyze the IPCP Configure-NAK option list, and adjust our
3224 * negotiation.
3225 */
3226 static void
3227 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3228 {
3229 u_char *buf, *p;
3230 struct ifnet *ifp = &sp->pp_if;
3231 int debug = ifp->if_flags & IFF_DEBUG;
3232 int desiredcomp;
3233 u_long wantaddr;
3234
3235 len -= 4;
3236 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3237
3238 if (debug)
3239 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3240 SPP_ARGS(ifp));
3241
3242 p = (void*) (h+1);
3243 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3244 /* Sanity check option length */
3245 if (p[1] > len) {
3246 /* XXX should we just RXJ? */
3247 log(-1, "%s: malicious IPCP option received, dropping\n",
3248 ifp->if_xname);
3249 return;
3250 }
3251 if (debug)
3252 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3253 switch (*p) {
3254 case IPCP_OPT_COMPRESSION:
3255 if (len >= 6 && p[1] == 6) {
3256 desiredcomp = p[2] << 8 | p[3];
3257 if (debug)
3258 log(-1, "[wantcomp %#04x] ",
3259 desiredcomp);
3260 if (desiredcomp == IPCP_COMP_VJ) {
3261 sl_compress_init(sp->pp_comp, p[4]);
3262 sp->ipcp.max_state = p[4];
3263 sp->ipcp.compress_cid = p[5];
3264 if (debug)
3265 log(-1, "[agree] ");
3266 } else
3267 sp->ipcp.opts &=
3268 ~(1 << IPCP_OPT_COMPRESSION);
3269 }
3270 break;
3271 case IPCP_OPT_ADDRESS:
3272 /*
3273 * Peer doesn't like our local IP address. See
3274 * if we can do something for him. We'll drop
3275 * him our address then.
3276 */
3277 if (len >= 6 && p[1] == 6) {
3278 wantaddr = p[2] << 24 | p[3] << 16 |
3279 p[4] << 8 | p[5];
3280 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3281 if (debug)
3282 log(-1, "[wantaddr %s] ",
3283 sppp_dotted_quad(wantaddr));
3284 /*
3285 * When doing dynamic address assignment,
3286 * we accept his offer. Otherwise, we
3287 * ignore it and thus continue to negotiate
3288 * our already existing value.
3289 * XXX: Bogus, if he said no once, he'll
3290 * just say no again, might as well die.
3291 */
3292 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3293 sppp_set_ip_addr(sp, wantaddr);
3294 if (debug)
3295 log(-1, "[agree] ");
3296 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3297 }
3298 }
3299 break;
3300 }
3301 }
3302 if (debug)
3303 log(-1, "\n");
3304 kfree (buf, M_TEMP);
3305 return;
3306 }
3307
3308 static void
3309 sppp_ipcp_tlu(struct sppp *sp)
3310 {
3311 /* we are up - notify isdn daemon */
3312 if (sp->pp_con)
3313 sp->pp_con(sp);
3314 }
3315
3316 static void
3317 sppp_ipcp_tld(struct sppp *sp)
3318 {
3319 }
3320
3321 static void
3322 sppp_ipcp_tls(struct sppp *sp)
3323 {
3324 /* indicate to LCP that it must stay alive */
3325 sp->lcp.protos |= (1 << IDX_IPCP);
3326 }
3327
3328 static void
3329 sppp_ipcp_tlf(struct sppp *sp)
3330 {
3331 /* we no longer need LCP */
3332 sp->lcp.protos &= ~(1 << IDX_IPCP);
3333 sppp_lcp_check_and_close(sp);
3334 }
3335
3336 static void
3337 sppp_ipcp_scr(struct sppp *sp)
3338 {
3339 char opt[6 /* compression */ + 6 /* address */];
3340 u_long ouraddr;
3341 int i = 0;
3342
3343 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3344 opt[i++] = IPCP_OPT_COMPRESSION;
3345 opt[i++] = 6;
3346 opt[i++] = IPCP_COMP_VJ >> 8;
3347 opt[i++] = IPCP_COMP_VJ;
3348 opt[i++] = sp->ipcp.max_state;
3349 opt[i++] = sp->ipcp.compress_cid;
3350 }
3351 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3352 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3353 opt[i++] = IPCP_OPT_ADDRESS;
3354 opt[i++] = 6;
3355 opt[i++] = ouraddr >> 24;
3356 opt[i++] = ouraddr >> 16;
3357 opt[i++] = ouraddr >> 8;
3358 opt[i++] = ouraddr;
3359 }
3360
3361 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3362 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3363 }
3364
3365 /*
3366 *--------------------------------------------------------------------------*
3367 * *
3368 * The IPv6CP implementation. *
3369 * *
3370 *--------------------------------------------------------------------------*
3371 */
3372
3373 #ifdef INET6
3374 static void
3375 sppp_ipv6cp_init(struct sppp *sp)
3376 {
3377 sp->ipv6cp.opts = 0;
3378 sp->ipv6cp.flags = 0;
3379 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3380 sp->fail_counter[IDX_IPV6CP] = 0;
3381 sp->pp_seq[IDX_IPV6CP] = 0;
3382 sp->pp_rseq[IDX_IPV6CP] = 0;
3383 #if defined(__NetBSD__)
3384 callout_init(&sp->ch[IDX_IPV6CP]);
3385 #endif
3386 #if defined(__DragonFly__)
3387 callout_init(&sp->timeout[IDX_IPV6CP]);
3388 #endif
3389 }
3390
3391 static void
3392 sppp_ipv6cp_up(struct sppp *sp)
3393 {
3394 sppp_up_event(&ipv6cp, sp);
3395 }
3396
3397 static void
3398 sppp_ipv6cp_down(struct sppp *sp)
3399 {
3400 sppp_down_event(&ipv6cp, sp);
3401 }
3402
3403 static void
3404 sppp_ipv6cp_open(struct sppp *sp)
3405 {
3406 STDDCL;
3407 struct in6_addr myaddr, hisaddr;
3408
3409 #ifdef IPV6CP_MYIFID_DYN
3410 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3411 #else
3412 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3413 #endif
3414
3415 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3416 /*
3417 * If we don't have our address, this probably means our
3418 * interface doesn't want to talk IPv6 at all. (This could
3419 * be the case if somebody wants to speak only IPX, for
3420 * example.) Don't open IPv6CP in this case.
3421 */
3422 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3423 /* XXX this message should go away */
3424 if (debug)
3425 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3426 SPP_ARGS(ifp));
3427 return;
3428 }
3429
3430 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3431 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3432 sppp_open_event(&ipv6cp, sp);
3433 }
3434
3435 static void
3436 sppp_ipv6cp_close(struct sppp *sp)
3437 {
3438 sppp_close_event(&ipv6cp, sp);
3439 }
3440
3441 static void
3442 sppp_ipv6cp_TO(void *cookie)
3443 {
3444 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3445 }
3446
3447 /*
3448 * Analyze a configure request. Return true if it was agreeable, and
3449 * caused action sca, false if it has been rejected or nak'ed, and
3450 * caused action scn. (The return value is used to make the state
3451 * transition decision in the state automaton.)
3452 */
3453 static int
3454 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3455 {
3456 u_char *buf, *r, *p;
3457 struct ifnet *ifp = &sp->pp_if;
3458 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3459 struct in6_addr myaddr, desiredaddr, suggestaddr;
3460 int ifidcount;
3461 int type;
3462 int collision, nohisaddr;
3463
3464 len -= 4;
3465 origlen = len;
3466 /*
3467 * Make sure to allocate a buf that can at least hold a
3468 * conf-nak with an `address' option. We might need it below.
3469 */
3470 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3471
3472 /* pass 1: see if we can recognize them */
3473 if (debug)
3474 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3475 SPP_ARGS(ifp));
3476 p = (void*) (h+1);
3477 ifidcount = 0;
3478 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3479 /* Sanity check option length */
3480 if (p[1] > len) {
3481 /* XXX just RXJ? */
3482 log(-1, "%s: received malicious IPCPv6 option, "
3483 "dropping\n", ifp->if_xname);
3484 goto drop;
3485 }
3486 if (debug)
3487 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3488 switch (*p) {
3489 case IPV6CP_OPT_IFID:
3490 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3491 /* correctly formed address option */
3492 ifidcount++;
3493 continue;
3494 }
3495 if (debug)
3496 log(-1, " [invalid]");
3497 break;
3498 #ifdef notyet
3499 case IPV6CP_OPT_COMPRESSION:
3500 if (len >= 4 && p[1] >= 4) {
3501 /* correctly formed compress option */
3502 continue;
3503 }
3504 if (debug)
3505 log(-1, " [invalid]");
3506 break;
3507 #endif
3508 default:
3509 /* Others not supported. */
3510 if (debug)
3511 log(-1, " [rej]");
3512 break;
3513 }
3514 /* Add the option to rejected list. */
3515 bcopy (p, r, p[1]);
3516 r += p[1];
3517 rlen += p[1];
3518 }
3519 if (rlen) {
3520 if (debug)
3521 log(-1, " send conf-rej\n");
3522 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3523 goto end;
3524 } else if (debug)
3525 log(-1, "\n");
3526
3527 /* pass 2: parse option values */
3528 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3529 if (debug)
3530 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3531 SPP_ARGS(ifp));
3532 p = (void*) (h+1);
3533 len = origlen;
3534 type = CONF_ACK;
3535 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3536 if (debug)
3537 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3538 switch (*p) {
3539 #ifdef notyet
3540 case IPV6CP_OPT_COMPRESSION:
3541 continue;
3542 #endif
3543 case IPV6CP_OPT_IFID:
3544 bzero(&desiredaddr, sizeof(desiredaddr));
3545 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3546 collision = (bcmp(&desiredaddr.s6_addr[8],
3547 &myaddr.s6_addr[8], 8) == 0);
3548 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3549
3550 desiredaddr.s6_addr16[0] = htons(0xfe80);
3551 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3552
3553 if (!collision && !nohisaddr) {
3554 /* no collision, hisaddr known - Conf-Ack */
3555 type = CONF_ACK;
3556
3557 if (debug) {
3558 log(-1, " %s [%s]",
3559 ip6_sprintf(&desiredaddr),
3560 sppp_cp_type_name(type));
3561 }
3562 continue;
3563 }
3564
3565 bzero(&suggestaddr, sizeof(&suggestaddr));
3566 if (collision && nohisaddr) {
3567 /* collision, hisaddr unknown - Conf-Rej */
3568 type = CONF_REJ;
3569 bzero(&p[2], 8);
3570 } else {
3571 /*
3572 * - no collision, hisaddr unknown, or
3573 * - collision, hisaddr known
3574 * Conf-Nak, suggest hisaddr
3575 */
3576 type = CONF_NAK;
3577 sppp_suggest_ip6_addr(sp, &suggestaddr);
3578 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3579 }
3580 if (debug)
3581 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr),
3582 sppp_cp_type_name(type));
3583 break;
3584 }
3585 /* Add the option to nak'ed list. */
3586 bcopy (p, r, p[1]);
3587 r += p[1];
3588 rlen += p[1];
3589 }
3590
3591 if (rlen == 0 && type == CONF_ACK) {
3592 if (debug)
3593 log(-1, " send %s\n", sppp_cp_type_name(type));
3594 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3595 } else {
3596 #ifdef DIAGNOSTIC
3597 if (type == CONF_ACK)
3598 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3599 #endif
3600
3601 if (debug) {
3602 log(-1, " send %s suggest %s\n",
3603 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3604 }
3605 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3606 }
3607
3608 end:
3609 kfree (buf, M_TEMP);
3610 return (rlen == 0);
3611
3612 drop:
3613 kfree(buf, M_TEMP);
3614 return (-1);
3615 }
3616
3617 /*
3618 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3619 * negotiation.
3620 */
3621 static void
3622 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3623 {
3624 u_char *buf, *p;
3625 struct ifnet *ifp = &sp->pp_if;
3626 int debug = ifp->if_flags & IFF_DEBUG;
3627
3628 len -= 4;
3629 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3630
3631 if (debug)
3632 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3633 SPP_ARGS(ifp));
3634
3635 p = (void*) (h+1);
3636 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3637 if (p[1] > len) {
3638 /* XXX just RXJ? */
3639 log(-1, "%s: received malicious IPCPv6 option, "
3640 "dropping\n", ifp->if_xname);
3641 goto drop;
3642 }
3643 if (debug)
3644 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3645 switch (*p) {
3646 case IPV6CP_OPT_IFID:
3647 /*
3648 * Peer doesn't grok address option. This is
3649 * bad. XXX Should we better give up here?
3650 */
3651 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3652 break;
3653 #ifdef notyet
3654 case IPV6CP_OPT_COMPRESS:
3655 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3656 break;
3657 #endif
3658 }
3659 }
3660 if (debug)
3661 log(-1, "\n");
3662 drop:
3663 kfree (buf, M_TEMP);
3664 return;
3665 }
3666
3667 /*
3668 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3669 * negotiation.
3670 */
3671 static void
3672 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3673 {
3674 u_char *buf, *p;
3675 struct ifnet *ifp = &sp->pp_if;
3676 int debug = ifp->if_flags & IFF_DEBUG;
3677 struct in6_addr suggestaddr;
3678
3679 len -= 4;
3680 buf = kmalloc (len, M_TEMP, M_INTWAIT);
3681
3682 if (debug)
3683 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3684 SPP_ARGS(ifp));
3685
3686 p = (void*) (h+1);
3687 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3688 if (p[1] > len) {
3689 /* XXX just RXJ? */
3690 log(-1, "%s: received malicious IPCPv6 option, "
3691 "dropping\n", ifp->if_xname);
3692 goto drop;
3693 }
3694 if (debug)
3695 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3696 switch (*p) {
3697 case IPV6CP_OPT_IFID:
3698 /*
3699 * Peer doesn't like our local ifid. See
3700 * if we can do something for him. We'll drop
3701 * him our address then.
3702 */
3703 if (len < 10 || p[1] != 10)
3704 break;
3705 bzero(&suggestaddr, sizeof(suggestaddr));
3706 suggestaddr.s6_addr16[0] = htons(0xfe80);
3707 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3708 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3709
3710 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3711 if (debug)
3712 log(-1, " [suggestaddr %s]",
3713 ip6_sprintf(&suggestaddr));
3714 #ifdef IPV6CP_MYIFID_DYN
3715 /*
3716 * When doing dynamic address assignment,
3717 * we accept his offer.
3718 */
3719 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3720 struct in6_addr lastsuggest;
3721 /*
3722 * If <suggested myaddr from peer> equals to
3723 * <hisaddr we have suggested last time>,
3724 * we have a collision. generate new random
3725 * ifid.
3726 */
3727 sppp_suggest_ip6_addr(&lastsuggest);
3728 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3729 lastsuggest)) {
3730 if (debug)
3731 log(-1, " [random]");
3732 sppp_gen_ip6_addr(sp, &suggestaddr);
3733 }
3734 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3735 if (debug)
3736 log(-1, " [agree]");
3737 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3738 }
3739 #else
3740 /*
3741 * Since we do not do dynamic address assignment,
3742 * we ignore it and thus continue to negotiate
3743 * our already existing value. This can possibly
3744 * go into infinite request-reject loop.
3745 *
3746 * This is not likely because we normally use
3747 * ifid based on MAC-address.
3748 * If you have no ethernet card on the node, too bad.
3749 * XXX should we use fail_counter?
3750 */
3751 #endif
3752 break;
3753 #ifdef notyet
3754 case IPV6CP_OPT_COMPRESS:
3755 /*
3756 * Peer wants different compression parameters.
3757 */
3758 break;
3759 #endif
3760 }
3761 }
3762 if (debug)
3763 log(-1, "\n");
3764 drop:
3765 kfree (buf, M_TEMP);
3766 return;
3767 }
3768 static void
3769 sppp_ipv6cp_tlu(struct sppp *sp)
3770 {
3771 /* we are up - notify isdn daemon */
3772 if (sp->pp_con)
3773 sp->pp_con(sp);
3774 }
3775
3776 static void
3777 sppp_ipv6cp_tld(struct sppp *sp)
3778 {
3779 }
3780
3781 static void
3782 sppp_ipv6cp_tls(struct sppp *sp)
3783 {
3784 /* indicate to LCP that it must stay alive */
3785 sp->lcp.protos |= (1 << IDX_IPV6CP);
3786 }
3787
3788 static void
3789 sppp_ipv6cp_tlf(struct sppp *sp)
3790 {
3791
3792 #if 0 /* need #if 0 to close IPv6CP properly */
3793 /* we no longer need LCP */
3794 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3795 sppp_lcp_check_and_close(sp);
3796 #endif
3797 }
3798
3799 static void
3800 sppp_ipv6cp_scr(struct sppp *sp)
3801 {
3802 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3803 struct in6_addr ouraddr;
3804 int i = 0;
3805
3806 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3807 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3808 opt[i++] = IPV6CP_OPT_IFID;
3809 opt[i++] = 10;
3810 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3811 i += 8;
3812 }
3813
3814 #ifdef notyet
3815 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3816 opt[i++] = IPV6CP_OPT_COMPRESSION;
3817 opt[i++] = 4;
3818 opt[i++] = 0; /* TBD */
3819 opt[i++] = 0; /* TBD */
3820 /* variable length data may follow */
3821 }
3822 #endif
3823
3824 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3825 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3826 }
3827 #else /*INET6*/
3828 static void
3829 sppp_ipv6cp_init(struct sppp *sp)
3830 {
3831 }
3832
3833 static void
3834 sppp_ipv6cp_up(struct sppp *sp)
3835 {
3836 }
3837
3838 static void
3839 sppp_ipv6cp_down(struct sppp *sp)
3840 {
3841 }
3842
3843
3844 static void
3845 sppp_ipv6cp_open(struct sppp *sp)
3846 {
3847 }
3848
3849 static void
3850 sppp_ipv6cp_close(struct sppp *sp)
3851 {
3852 }
3853
3854 static void
3855 sppp_ipv6cp_TO(void *sp)
3856 {
3857 }
3858
3859 static int
3860 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3861 {
3862 return 0;
3863 }
3864
3865 static void
3866 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3867 {
3868 }
3869
3870 static void
3871 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3872 {
3873 }
3874
3875 static void
3876 sppp_ipv6cp_tlu(struct sppp *sp)
3877 {
3878 }
3879
3880 static void
3881 sppp_ipv6cp_tld(struct sppp *sp)
3882 {
3883 }
3884
3885 static void
3886 sppp_ipv6cp_tls(struct sppp *sp)
3887 {
3888 }
3889
3890 static void
3891 sppp_ipv6cp_tlf(struct sppp *sp)
3892 {
3893 }
3894
3895 static void
3896 sppp_ipv6cp_scr(struct sppp *sp)
3897 {
3898 }
3899 #endif /*INET6*/
3900
3901 /*
3902 *--------------------------------------------------------------------------*
3903 * *
3904 * The CHAP implementation. *
3905 * *
3906 *--------------------------------------------------------------------------*
3907 */
3908
3909 /*
3910 * The authentication protocols don't employ a full-fledged state machine as
3911 * the control protocols do, since they do have Open and Close events, but
3912 * not Up and Down, nor are they explicitly terminated. Also, use of the
3913 * authentication protocols may be different in both directions (this makes
3914 * sense, think of a machine that never accepts incoming calls but only
3915 * calls out, it doesn't require the called party to authenticate itself).
3916 *
3917 * Our state machine for the local authentication protocol (we are requesting
3918 * the peer to authenticate) looks like:
3919 *
3920 * RCA-
3921 * +--------------------------------------------+
3922 * V scn,tld|
3923 * +--------+ Close +---------+ RCA+
3924 * | |<----------------------------------| |------+
3925 * +--->| Closed | TO* | Opened | sca |
3926 * | | |-----+ +-------| |<-----+
3927 * | +--------+ irc | | +---------+
3928 * | ^ | | ^
3929 * | | | | |
3930 * | | | | |
3931 * | TO-| | | |
3932 * | |tld TO+ V | |
3933 * | | +------->+ | |
3934 * | | | | | |
3935 * | +--------+ V | |
3936 * | | |<----+<--------------------+ |
3937 * | | Req- | scr |
3938 * | | Sent | |
3939 * | | | |
3940 * | +--------+ |
3941 * | RCA- | | RCA+ |
3942 * +------+ +------------------------------------------+
3943 * scn,tld sca,irc,ict,tlu
3944 *
3945 *
3946 * with:
3947 *
3948 * Open: LCP reached authentication phase
3949 * Close: LCP reached terminate phase
3950 *
3951 * RCA+: received reply (pap-req, chap-response), acceptable
3952 * RCN: received reply (pap-req, chap-response), not acceptable
3953 * TO+: timeout with restart counter >= 0
3954 * TO-: timeout with restart counter < 0
3955 * TO*: reschedule timeout for CHAP
3956 *
3957 * scr: send request packet (none for PAP, chap-challenge)
3958 * sca: send ack packet (pap-ack, chap-success)
3959 * scn: send nak packet (pap-nak, chap-failure)
3960 * ict: initialize re-challenge timer (CHAP only)
3961 *
3962 * tlu: this-layer-up, LCP reaches network phase
3963 * tld: this-layer-down, LCP enters terminate phase
3964 *
3965 * Note that in CHAP mode, after sending a new challenge, while the state
3966 * automaton falls back into Req-Sent state, it doesn't signal a tld
3967 * event to LCP, so LCP remains in network phase. Only after not getting
3968 * any response (or after getting an unacceptable response), CHAP closes,
3969 * causing LCP to enter terminate phase.
3970 *
3971 * With PAP, there is no initial request that can be sent. The peer is
3972 * expected to send one based on the successful negotiation of PAP as
3973 * the authentication protocol during the LCP option negotiation.
3974 *
3975 * Incoming authentication protocol requests (remote requests
3976 * authentication, we are peer) don't employ a state machine at all,
3977 * they are simply answered. Some peers [Ascend P50 firmware rev
3978 * 4.50] react allergically when sending IPCP requests while they are
3979 * still in authentication phase (thereby violating the standard that
3980 * demands that these NCP packets are to be discarded), so we keep
3981 * track of the peer demanding us to authenticate, and only proceed to
3982 * phase network once we've seen a positive acknowledge for the
3983 * authentication.
3984 */
3985
3986 /*
3987 * Handle incoming CHAP packets.
3988 */
3989 void
3990 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3991 {
3992 STDDCL;
3993 struct lcp_header *h;
3994 int len;
3995 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3996 int value_len, name_len;
3997 MD5_CTX ctx;
3998
3999 len = m->m_pkthdr.len;
4000 if (len < 4) {
4001 if (debug)
4002 log(LOG_DEBUG,
4003 SPP_FMT "chap invalid packet length: %d bytes\n",
4004 SPP_ARGS(ifp), len);
4005 return;
4006 }
4007 h = mtod (m, struct lcp_header*);
4008 if (len > ntohs (h->len))
4009 len = ntohs (h->len);
4010
4011 switch (h->type) {
4012 /* challenge, failure and success are his authproto */
4013 case CHAP_CHALLENGE:
4014 value = 1 + (u_char*)(h+1);
4015 value_len = value[-1];
4016 name = value + value_len;
4017 name_len = len - value_len - 5;
4018 if (name_len < 0) {
4019 if (debug) {
4020 log(LOG_DEBUG,
4021 SPP_FMT "chap corrupted challenge "
4022 "<%s id=0x%x len=%d",
4023 SPP_ARGS(ifp),
4024 sppp_auth_type_name(PPP_CHAP, h->type),
4025 h->ident, ntohs(h->len));
4026 sppp_print_bytes((u_char*) (h+1), len-4);
4027 log(-1, ">\n");
4028 }
4029 break;
4030 }
4031
4032 if (debug) {
4033 log(LOG_DEBUG,
4034 SPP_FMT "chap input <%s id=0x%x len=%d name=",
4035 SPP_ARGS(ifp),
4036 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4037 ntohs(h->len));
4038 sppp_print_string((char*) name, name_len);
4039 log(-1, " value-size=%d value=", value_len);
4040 sppp_print_bytes(value, value_len);
4041 log(-1, ">\n");
4042 }
4043
4044 /* Compute reply value. */
4045 MD5Init(&ctx);
4046 MD5Update(&ctx, &h->ident, 1);
4047 MD5Update(&ctx, sp->myauth.secret,
4048 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4049 MD5Update(&ctx, value, value_len);
4050 MD5Final(digest, &ctx);
4051 dsize = sizeof digest;
4052
4053 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4054 sizeof dsize, (const char *)&dsize,
4055 sizeof digest, digest,
4056 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4057 sp->myauth.name,
4058 0);
4059 break;
4060
4061 case CHAP_SUCCESS:
4062 if (debug) {
4063 log(LOG_DEBUG, SPP_FMT "chap success",
4064 SPP_ARGS(ifp));
4065 if (len > 4) {
4066 log(-1, ": ");
4067 sppp_print_string((char*)(h + 1), len - 4);
4068 }
4069 log(-1, "\n");
4070 }
4071
4072 crit_enter();
4073
4074 sp->pp_flags &= ~PP_NEEDAUTH;
4075 if (sp->myauth.proto == PPP_CHAP &&
4076 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4077 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4078 /*
4079 * We are authenticator for CHAP but didn't
4080 * complete yet. Leave it to tlu to proceed
4081 * to network phase.
4082 */
4083 crit_exit();
4084 break;
4085 }
4086 crit_exit();
4087 sppp_phase_network(sp);
4088 break;
4089
4090 case CHAP_FAILURE:
4091 if (debug) {
4092 log(LOG_INFO, SPP_FMT "chap failure",
4093 SPP_ARGS(ifp));
4094 if (len > 4) {
4095 log(-1, ": ");
4096 sppp_print_string((char*)(h + 1), len - 4);
4097 }
4098 log(-1, "\n");
4099 } else
4100 log(LOG_INFO, SPP_FMT "chap failure\n",
4101 SPP_ARGS(ifp));
4102 /* await LCP shutdown by authenticator */
4103 break;
4104
4105 /* response is my authproto */
4106 case CHAP_RESPONSE:
4107 value = 1 + (u_char*)(h+1);
4108 value_len = value[-1];
4109 name = value + value_len;
4110 name_len = len - value_len - 5;
4111 if (name_len < 0) {
4112 if (debug) {
4113 log(LOG_DEBUG,
4114 SPP_FMT "chap corrupted response "
4115 "<%s id=0x%x len=%d",
4116 SPP_ARGS(ifp),
4117 sppp_auth_type_name(PPP_CHAP, h->type),
4118 h->ident, ntohs(h->len));
4119 sppp_print_bytes((u_char*)(h+1), len-4);
4120 log(-1, ">\n");
4121 }
4122 break;
4123 }
4124 if (h->ident != sp->confid[IDX_CHAP]) {
4125 if (debug)
4126 log(LOG_DEBUG,
4127 SPP_FMT "chap dropping response for old ID "
4128 "(got %d, expected %d)\n",
4129 SPP_ARGS(ifp),
4130 h->ident, sp->confid[IDX_CHAP]);
4131 break;
4132 }
4133 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4134 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4135 log(LOG_INFO, SPP_FMT "chap response, his name ",
4136 SPP_ARGS(ifp));
4137 sppp_print_string(name, name_len);
4138 log(-1, " != expected ");
4139 sppp_print_string(sp->hisauth.name,
4140 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4141 log(-1, "\n");
4142 }
4143 if (debug) {
4144 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4145 "<%s id=0x%x len=%d name=",
4146 SPP_ARGS(ifp),
4147 sppp_state_name(sp->state[IDX_CHAP]),
4148 sppp_auth_type_name(PPP_CHAP, h->type),
4149 h->ident, ntohs (h->len));
4150 sppp_print_string((char*)name, name_len);
4151 log(-1, " value-size=%d value=", value_len);
4152 sppp_print_bytes(value, value_len);
4153 log(-1, ">\n");
4154 }
4155 if (value_len != AUTHKEYLEN) {
4156 if (debug)
4157 log(LOG_DEBUG,
4158 SPP_FMT "chap bad hash value length: "
4159 "%d bytes, should be %d\n",
4160 SPP_ARGS(ifp), value_len,
4161 AUTHKEYLEN);
4162 break;
4163 }
4164
4165 MD5Init(&ctx);
4166 MD5Update(&ctx, &h->ident, 1);
4167 MD5Update(&ctx, sp->hisauth.secret,
4168 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4169 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4170 MD5Final(digest, &ctx);
4171
4172 #define FAILMSG "Failed..."
4173 #define SUCCMSG "Welcome!"
4174
4175 if (value_len != sizeof digest ||
4176 bcmp(digest, value, value_len) != 0) {
4177 /* action scn, tld */
4178 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4179 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4180 0);
4181 chap.tld(sp);
4182 break;
4183 }
4184 /* action sca, perhaps tlu */
4185 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4186 sp->state[IDX_CHAP] == STATE_OPENED)
4187 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4188 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4189 0);
4190 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4191 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4192 chap.tlu(sp);
4193 }
4194 break;
4195
4196 default:
4197 /* Unknown CHAP packet type -- ignore. */
4198 if (debug) {
4199 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4200 "<0x%x id=0x%xh len=%d",
4201 SPP_ARGS(ifp),
4202 sppp_state_name(sp->state[IDX_CHAP]),
4203 h->type, h->ident, ntohs(h->len));
4204 sppp_print_bytes((u_char*)(h+1), len-4);
4205 log(-1, ">\n");
4206 }
4207 break;
4208
4209 }
4210 }
4211
4212 static void
4213 sppp_chap_init(struct sppp *sp)
4214 {
4215 /* Chap doesn't have STATE_INITIAL at all. */
4216 sp->state[IDX_CHAP] = STATE_CLOSED;
4217 sp->fail_counter[IDX_CHAP] = 0;
4218 sp->pp_seq[IDX_CHAP] = 0;
4219 sp->pp_rseq[IDX_CHAP] = 0;
4220 #if defined(__DragonFly__)
4221 callout_init(&sp->timeout[IDX_CHAP]);
4222 #endif
4223 }
4224
4225 static void
4226 sppp_chap_open(struct sppp *sp)
4227 {
4228 if (sp->myauth.proto == PPP_CHAP &&
4229 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4230 /* we are authenticator for CHAP, start it */
4231 chap.scr(sp);
4232 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4233 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4234 }
4235 /* nothing to be done if we are peer, await a challenge */
4236 }
4237
4238 static void
4239 sppp_chap_close(struct sppp *sp)
4240 {
4241 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4242 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4243 }
4244
4245 static void
4246 sppp_chap_TO(void *cookie)
4247 {
4248 struct sppp *sp = (struct sppp *)cookie;
4249 STDDCL;
4250
4251 crit_enter();
4252
4253 if (debug)
4254 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4255 SPP_ARGS(ifp),
4256 sppp_state_name(sp->state[IDX_CHAP]),
4257 sp->rst_counter[IDX_CHAP]);
4258
4259 if (--sp->rst_counter[IDX_CHAP] < 0)
4260 /* TO- event */
4261 switch (sp->state[IDX_CHAP]) {
4262 case STATE_REQ_SENT:
4263 chap.tld(sp);
4264 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4265 break;
4266 }
4267 else
4268 /* TO+ (or TO*) event */
4269 switch (sp->state[IDX_CHAP]) {
4270 case STATE_OPENED:
4271 /* TO* event */
4272 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4273 /* fall through */
4274 case STATE_REQ_SENT:
4275 chap.scr(sp);
4276 /* sppp_cp_change_state() will restart the timer */
4277 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4278 break;
4279 }
4280
4281 crit_exit();
4282 }
4283
4284 static void
4285 sppp_chap_tlu(struct sppp *sp)
4286 {
4287 STDDCL;
4288 int i;
4289
4290 i = 0;
4291 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4292
4293 /*
4294 * Some broken CHAP implementations (Conware CoNet, firmware
4295 * 4.0.?) don't want to re-authenticate their CHAP once the
4296 * initial challenge-response exchange has taken place.
4297 * Provide for an option to avoid rechallenges.
4298 */
4299 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4300 /*
4301 * Compute the re-challenge timeout. This will yield
4302 * a number between 300 and 810 seconds.
4303 */
4304 i = 300 + ((unsigned)(krandom() & 0xff00) >> 7);
4305 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4306 }
4307
4308 if (debug) {
4309 log(LOG_DEBUG,
4310 SPP_FMT "chap %s, ",
4311 SPP_ARGS(ifp),
4312 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4313 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4314 log(-1, "next re-challenge in %d seconds\n", i);
4315 else
4316 log(-1, "re-challenging supressed\n");
4317 }
4318
4319 crit_enter();
4320
4321 /* indicate to LCP that we need to be closed down */
4322 sp->lcp.protos |= (1 << IDX_CHAP);
4323
4324 if (sp->pp_flags & PP_NEEDAUTH) {
4325 /*
4326 * Remote is authenticator, but his auth proto didn't
4327 * complete yet. Defer the transition to network
4328 * phase.
4329 */
4330 crit_exit();
4331 return;
4332 }
4333
4334 crit_exit();
4335
4336 /*
4337 * If we are already in phase network, we are done here. This
4338 * is the case if this is a dummy tlu event after a re-challenge.
4339 */
4340 if (sp->pp_phase != PHASE_NETWORK)
4341 sppp_phase_network(sp);
4342 }
4343
4344 static void
4345 sppp_chap_tld(struct sppp *sp)
4346 {
4347 STDDCL;
4348
4349 if (debug)
4350 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4351 callout_stop(&sp->timeout[IDX_CHAP]);
4352 sp->lcp.protos &= ~(1 << IDX_CHAP);
4353
4354 lcp.Close(sp);
4355 }
4356
4357 static void
4358 sppp_chap_scr(struct sppp *sp)
4359 {
4360 u_long *ch, seed;
4361 u_char clen;
4362
4363 /* Compute random challenge. */
4364 ch = (u_long *)sp->myauth.challenge;
4365 #if defined(__DragonFly__)
4366 read_random(&seed, sizeof seed);
4367 #else
4368 {
4369 struct timeval tv;
4370 microtime(&tv);
4371 seed = tv.tv_sec ^ tv.tv_usec;
4372 }
4373 #endif
4374 ch[0] = seed ^ krandom();
4375 ch[1] = seed ^ krandom();
4376 ch[2] = seed ^ krandom();
4377 ch[3] = seed ^ krandom();
4378 clen = AUTHKEYLEN;
4379
4380 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4381
4382 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4383 sizeof clen, (const char *)&clen,
4384 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4385 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4386 sp->myauth.name,
4387 0);
4388 }
4389
4390 /*
4391 *--------------------------------------------------------------------------*
4392 * *
4393 * The PAP implementation. *
4394 * *
4395 *--------------------------------------------------------------------------*
4396 */
4397 /*
4398 * For PAP, we need to keep a little state also if we are the peer, not the
4399 * authenticator. This is since we don't get a request to authenticate, but
4400 * have to repeatedly authenticate ourself until we got a response (or the
4401 * retry counter is expired).
4402 */
4403
4404 /*
4405 * Handle incoming PAP packets. */
4406 static void
4407 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4408 {
4409 STDDCL;
4410 struct lcp_header *h;
4411 int len;
4412 u_char *name, *passwd, mlen;
4413 int name_len, passwd_len;
4414
4415 /*
4416 * Malicious input might leave this uninitialized, so
4417 * init to an impossible value.
4418 */
4419 passwd_len = -1;
4420
4421 len = m->m_pkthdr.len;
4422 if (len < 5) {
4423 if (debug)
4424 log(LOG_DEBUG,
4425 SPP_FMT "pap invalid packet length: %d bytes\n",
4426 SPP_ARGS(ifp), len);
4427 return;
4428 }
4429 h = mtod (m, struct lcp_header*);
4430 if (len > ntohs (h->len))
4431 len = ntohs (h->len);
4432 switch (h->type) {
4433 /* PAP request is my authproto */
4434 case PAP_REQ:
4435 name = 1 + (u_char*)(h+1);
4436 name_len = name[-1];
4437 passwd = name + name_len + 1;
4438 if (name_len > len - 6 ||
4439 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4440 if (debug) {
4441 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4442 "<%s id=0x%x len=%d",
4443 SPP_ARGS(ifp),
4444 sppp_auth_type_name(PPP_PAP, h->type),
4445 h->ident, ntohs(h->len));
4446 sppp_print_bytes((u_char*)(h+1), len-4);
4447 log(-1, ">\n");
4448 }
4449 break;
4450 }
4451 if (debug) {
4452 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4453 "<%s id=0x%x len=%d name=",
4454 SPP_ARGS(ifp),
4455 sppp_state_name(sp->state[IDX_PAP]),
4456 sppp_auth_type_name(PPP_PAP, h->type),
4457 h->ident, ntohs(h->len));
4458 sppp_print_string((char*)name, name_len);
4459 log(-1, " passwd=");
4460 sppp_print_string((char*)passwd, passwd_len);
4461 log(-1, ">\n");
4462 }
4463 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4464 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4465 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4466 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4467 /* action scn, tld */
4468 mlen = sizeof(FAILMSG) - 1;
4469 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4470 sizeof mlen, (const char *)&mlen,
4471 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4472 0);
4473 pap.tld(sp);
4474 break;
4475 }
4476 /* action sca, perhaps tlu */
4477 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4478 sp->state[IDX_PAP] == STATE_OPENED) {
4479 mlen = sizeof(SUCCMSG) - 1;
4480 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4481 sizeof mlen, (const char *)&mlen,
4482 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4483 0);
4484 }
4485 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4486 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4487 pap.tlu(sp);
4488 }
4489 break;
4490
4491 /* ack and nak are his authproto */
4492 case PAP_ACK:
4493 callout_stop(&sp->pap_my_to);
4494 if (debug) {
4495 log(LOG_DEBUG, SPP_FMT "pap success",
4496 SPP_ARGS(ifp));
4497 name = 1 + (u_char *)(h + 1);
4498 name_len = name[-1];
4499 if (len > 5 && name_len < len+4) {
4500 log(-1, ": ");
4501 sppp_print_string(name, name_len);
4502 }
4503 log(-1, "\n");
4504 }
4505
4506 crit_enter();
4507
4508 sp->pp_flags &= ~PP_NEEDAUTH;
4509 if (sp->myauth.proto == PPP_PAP &&
4510 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4511 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4512 /*
4513 * We are authenticator for PAP but didn't
4514 * complete yet. Leave it to tlu to proceed
4515 * to network phase.
4516 */
4517
4518 crit_exit();
4519
4520 break;
4521 }
4522
4523 crit_exit();
4524
4525 sppp_phase_network(sp);
4526 break;
4527
4528 case PAP_NAK:
4529 callout_stop(&sp->pap_my_to);
4530 if (debug) {
4531 log(LOG_INFO, SPP_FMT "pap failure",
4532 SPP_ARGS(ifp));
4533 name = 1 + (u_char *)(h + 1);
4534 name_len = name[-1];
4535 if (len > 5 && name_len < len+4) {
4536 log(-1, ": ");
4537 sppp_print_string(name, name_len);
4538 }
4539 log(-1, "\n");
4540 } else
4541 log(LOG_INFO, SPP_FMT "pap failure\n",
4542 SPP_ARGS(ifp));
4543 /* await LCP shutdown by authenticator */
4544 break;
4545
4546 default:
4547 /* Unknown PAP packet type -- ignore. */
4548 if (debug) {
4549 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4550 "<0x%x id=0x%x len=%d",
4551 SPP_ARGS(ifp),
4552 h->type, h->ident, ntohs(h->len));
4553 sppp_print_bytes((u_char*)(h+1), len-4);
4554 log(-1, ">\n");
4555 }
4556 break;
4557
4558 }
4559 }
4560
4561 static void
4562 sppp_pap_init(struct sppp *sp)
4563 {
4564 /* PAP doesn't have STATE_INITIAL at all. */
4565 sp->state[IDX_PAP] = STATE_CLOSED;
4566 sp->fail_counter[IDX_PAP] = 0;
4567 sp->pp_seq[IDX_PAP] = 0;
4568 sp->pp_rseq[IDX_PAP] = 0;
4569 #if defined(__DragonFly__)
4570 callout_init(&sp->timeout[IDX_PAP]);
4571 callout_init(&sp->pap_my_to);
4572 #endif
4573 }
4574
4575 static void
4576 sppp_pap_open(struct sppp *sp)
4577 {
4578 if (sp->hisauth.proto == PPP_PAP &&
4579 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4580 /* we are authenticator for PAP, start our timer */
4581 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4582 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4583 }
4584 if (sp->myauth.proto == PPP_PAP) {
4585 /* we are peer, send a request, and start a timer */
4586 pap.scr(sp);
4587 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4588 sppp_pap_my_TO, sp);
4589 }
4590 }
4591
4592 static void
4593 sppp_pap_close(struct sppp *sp)
4594 {
4595 if (sp->state[IDX_PAP] != STATE_CLOSED)
4596 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4597 }
4598
4599 /*
4600 * That's the timeout routine if we are authenticator. Since the
4601 * authenticator is basically passive in PAP, we can't do much here.
4602 */
4603 static void
4604 sppp_pap_TO(void *cookie)
4605 {
4606 struct sppp *sp = (struct sppp *)cookie;
4607 STDDCL;
4608
4609 crit_enter();
4610
4611 if (debug)
4612 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4613 SPP_ARGS(ifp),
4614 sppp_state_name(sp->state[IDX_PAP]),
4615 sp->rst_counter[IDX_PAP]);
4616
4617 if (--sp->rst_counter[IDX_PAP] < 0)
4618 /* TO- event */
4619 switch (sp->state[IDX_PAP]) {
4620 case STATE_REQ_SENT:
4621 pap.tld(sp);
4622 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4623 break;
4624 }
4625 else
4626 /* TO+ event, not very much we could do */
4627 switch (sp->state[IDX_PAP]) {
4628 case STATE_REQ_SENT:
4629 /* sppp_cp_change_state() will restart the timer */
4630 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4631 break;
4632 }
4633
4634 crit_exit();
4635 }
4636
4637 /*
4638 * That's the timeout handler if we are peer. Since the peer is active,
4639 * we need to retransmit our PAP request since it is apparently lost.
4640 * XXX We should impose a max counter.
4641 */
4642 static void
4643 sppp_pap_my_TO(void *cookie)
4644 {
4645 struct sppp *sp = (struct sppp *)cookie;
4646 STDDCL;
4647
4648 if (debug)
4649 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4650 SPP_ARGS(ifp));
4651
4652 pap.scr(sp);
4653 }
4654
4655 static void
4656 sppp_pap_tlu(struct sppp *sp)
4657 {
4658 STDDCL;
4659
4660 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4661
4662 if (debug)
4663 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4664 SPP_ARGS(ifp), pap.name);
4665
4666 crit_enter();
4667
4668 /* indicate to LCP that we need to be closed down */
4669 sp->lcp.protos |= (1 << IDX_PAP);
4670
4671 if (sp->pp_flags & PP_NEEDAUTH) {
4672 /*
4673 * Remote is authenticator, but his auth proto didn't
4674 * complete yet. Defer the transition to network
4675 * phase.
4676 */
4677 crit_exit();
4678 return;
4679 }
4680 crit_exit();
4681 sppp_phase_network(sp);
4682 }
4683
4684 static void
4685 sppp_pap_tld(struct sppp *sp)
4686 {
4687 STDDCL;
4688
4689 if (debug)
4690 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4691 callout_stop(&sp->timeout[IDX_PAP]);
4692 callout_stop(&sp->pap_my_to);
4693 sp->lcp.protos &= ~(1 << IDX_PAP);
4694
4695 lcp.Close(sp);
4696 }
4697
4698 static void
4699 sppp_pap_scr(struct sppp *sp)
4700 {
4701 u_char idlen, pwdlen;
4702
4703 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4704 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4705 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4706
4707 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4708 sizeof idlen, (const char *)&idlen,
4709 (size_t)idlen, sp->myauth.name,
4710 sizeof pwdlen, (const char *)&pwdlen,
4711 (size_t)pwdlen, sp->myauth.secret,
4712 0);
4713 }
4714
4715 /*
4716 * Random miscellaneous functions.
4717 */
4718
4719 /*
4720 * Send a PAP or CHAP proto packet.
4721 *
4722 * Varadic function, each of the elements for the ellipsis is of type
4723 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4724 * mlen == 0.
4725 * NOTE: never declare variadic functions with types subject to type
4726 * promotion (i.e. u_char). This is asking for big trouble depending
4727 * on the architecture you are on...
4728 */
4729
4730 static void
4731 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4732 unsigned int type, unsigned int id,
4733 ...)
4734 {
4735 STDDCL;
4736 struct ppp_header *h;
4737 struct lcp_header *lh;
4738 struct mbuf *m;
4739 u_char *p;
4740 int len;
4741 unsigned int mlen;
4742 const char *msg;
4743 __va_list ap;
4744
4745 MGETHDR (m, MB_DONTWAIT, MT_DATA);
4746 if (! m)
4747 return;
4748 m->m_pkthdr.rcvif = 0;
4749
4750 h = mtod (m, struct ppp_header*);
4751 h->address = PPP_ALLSTATIONS; /* broadcast address */
4752 h->control = PPP_UI; /* Unnumbered Info */
4753 h->protocol = htons(cp->proto);
4754
4755 lh = (struct lcp_header*)(h + 1);
4756 lh->type = type;
4757 lh->ident = id;
4758 p = (u_char*) (lh+1);
4759
4760 __va_start(ap, id);
4761 len = 0;
4762
4763 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4764 msg = __va_arg(ap, const char *);
4765 len += mlen;
4766 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4767 __va_end(ap);
4768 m_freem(m);
4769 return;
4770 }
4771
4772 bcopy(msg, p, mlen);
4773 p += mlen;
4774 }
4775 __va_end(ap);
4776
4777 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4778 lh->len = htons (LCP_HEADER_LEN + len);
4779
4780 if (debug) {
4781 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4782 SPP_ARGS(ifp), cp->name,
4783 sppp_auth_type_name(cp->proto, lh->type),
4784 lh->ident, ntohs(lh->len));
4785 sppp_print_bytes((u_char*) (lh+1), len);
4786 log(-1, ">\n");
4787 }
4788 if (IF_QFULL (&sp->pp_cpq)) {
4789 IF_DROP (&sp->pp_fastq);
4790 IF_DROP (&ifp->if_snd);
4791 m_freem (m);
4792 ++ifp->if_oerrors;
4793 } else
4794 IF_ENQUEUE (&sp->pp_cpq, m);
4795 if (! (ifp->if_flags & IFF_OACTIVE))
4796 (*ifp->if_start) (ifp);
4797 ifp->if_obytes += m->m_pkthdr.len + 3;
4798 }
4799
4800 /*
4801 * Send keepalive packets, every 10 seconds.
4802 */
4803 static void
4804 sppp_keepalive(void *dummy)
4805 {
4806 struct sppp *sp;
4807
4808 crit_enter();
4809
4810 for (sp=spppq; sp; sp=sp->pp_next) {
4811 struct ifnet *ifp = &sp->pp_if;
4812
4813 /* Keepalive mode disabled or channel down? */
4814 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4815 ! (ifp->if_flags & IFF_RUNNING))
4816 continue;
4817
4818 /* No keepalive in PPP mode if LCP not opened yet. */
4819 if (sp->pp_mode != IFF_CISCO &&
4820 sp->pp_phase < PHASE_AUTHENTICATE)
4821 continue;
4822
4823 if (sp->pp_alivecnt == MAXALIVECNT) {
4824 /* No keepalive packets got. Stop the interface. */
4825 kprintf (SPP_FMT "down\n", SPP_ARGS(ifp));
4826 if_down (ifp);
4827 IF_DRAIN(&sp->pp_cpq);
4828 if (sp->pp_mode != IFF_CISCO) {
4829 /* XXX */
4830 /* Shut down the PPP link. */
4831 lcp.Down(sp);
4832 /* Initiate negotiation. XXX */
4833 lcp.Up(sp);
4834 }
4835 }
4836 lwkt_serialize_enter(ifp->if_serializer);
4837 if (sp->pp_alivecnt <= MAXALIVECNT)
4838 ++sp->pp_alivecnt;
4839 if (sp->pp_mode == IFF_CISCO)
4840 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4841 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4842 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4843 long nmagic = htonl (sp->lcp.magic);
4844 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4845 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4846 sp->lcp.echoid, 4, &nmagic);
4847 }
4848 lwkt_serialize_exit(ifp->if_serializer);
4849 }
4850 callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4851 crit_exit();
4852 }
4853
4854 /*
4855 * Get both IP addresses.
4856 */
4857 static void
4858 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4859 {
4860 struct ifnet *ifp = &sp->pp_if;
4861 struct ifaddr_container *ifac;
4862 struct ifaddr *ifa;
4863 struct sockaddr_in *si, *sm;
4864 u_long ssrc, ddst;
4865
4866 sm = NULL;
4867 ssrc = ddst = 0L;
4868 /*
4869 * Pick the first AF_INET address from the list,
4870 * aliases don't make any sense on a p2p link anyway.
4871 */
4872 si = 0;
4873 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4874 ifa = ifac->ifa;
4875 if (ifa->ifa_addr->sa_family == AF_INET) {
4876 si = (struct sockaddr_in *)ifa->ifa_addr;
4877 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4878 if (si)
4879 break;
4880 }
4881 }
4882 if (ifac != NULL) {
4883 if (si && si->sin_addr.s_addr) {
4884 ssrc = si->sin_addr.s_addr;
4885 if (srcmask)
4886 *srcmask = ntohl(sm->sin_addr.s_addr);
4887 }
4888
4889 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4890 if (si && si->sin_addr.s_addr)
4891 ddst = si->sin_addr.s_addr;
4892 }
4893
4894 if (dst) *dst = ntohl(ddst);
4895 if (src) *src = ntohl(ssrc);
4896 }
4897
4898 /*
4899 * Set my IP address. Must be called at splimp.
4900 */
4901 static void
4902 sppp_set_ip_addr(struct sppp *sp, u_long src)
4903 {
4904 STDDCL;
4905 struct ifaddr_container *ifac;
4906 struct ifaddr *ifa = NULL;
4907 struct sockaddr_in *si;
4908 struct in_ifaddr *ia;
4909
4910 /*
4911 * Pick the first AF_INET address from the list,
4912 * aliases don't make any sense on a p2p link anyway.
4913 */
4914 si = 0;
4915 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4916 ifa = ifac->ifa;
4917 if (ifa->ifa_addr->sa_family == AF_INET) {
4918 si = (struct sockaddr_in *)ifa->ifa_addr;
4919 if (si)
4920 break;
4921 }
4922 }
4923
4924 if (ifac != NULL && si != NULL) {
4925 int error;
4926 #if __NetBSD_Version__ >= 103080000
4927 struct sockaddr_in new_sin = *si;
4928
4929 new_sin.sin_addr.s_addr = htonl(src);
4930 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
4931 if(debug && error)
4932 {
4933 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
4934 " failed, error=%d\n", SPP_ARGS(ifp), error);
4935 }
4936 #else
4937 /* delete old route */
4938 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4939 if(debug && error)
4940 {
4941 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4942 SPP_ARGS(ifp), error);
4943 }
4944
4945 /* set new address */
4946 si->sin_addr.s_addr = htonl(src);
4947 ia = ifatoia(ifa);
4948 LIST_REMOVE(ia, ia_hash);
4949 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4950
4951 /* add new route */
4952 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4953 if (debug && error)
4954 {
4955 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4956 SPP_ARGS(ifp), error);
4957 }
4958 #endif
4959 }
4960 }
4961
4962 #ifdef INET6
4963 /*
4964 * Get both IPv6 addresses.
4965 */
4966 static void
4967 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4968 struct in6_addr *srcmask)
4969 {
4970 struct ifnet *ifp = &sp->pp_if;
4971 struct ifaddr_container *ifac;
4972 struct ifaddr *ifa;
4973 struct sockaddr_in6 *si, *sm;
4974 struct in6_addr ssrc, ddst;
4975
4976 sm = NULL;
4977 bzero(&ssrc, sizeof(ssrc));
4978 bzero(&ddst, sizeof(ddst));
4979 /*
4980 * Pick the first link-local AF_INET6 address from the list,
4981 * aliases don't make any sense on a p2p link anyway.
4982 */
4983 si = 0;
4984 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4985 ifa = ifac->ifa;
4986 if (ifa->ifa_addr->sa_family == AF_INET6) {
4987 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4988 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4989 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4990 break;
4991 }
4992 }
4993 if (ifac != NULL) {
4994 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4995 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4996 if (srcmask) {
4997 bcopy(&sm->sin6_addr, srcmask,
4998 sizeof(*srcmask));
4999 }
5000 }
5001
5002 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
5003 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
5004 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
5005 }
5006
5007 if (dst)
5008 bcopy(&ddst, dst, sizeof(*dst));
5009 if (src)
5010 bcopy(&ssrc, src, sizeof(*src));
5011 }
5012
5013 #ifdef IPV6CP_MYIFID_DYN
5014 /*
5015 * Generate random ifid.
5016 */
5017 static void
5018 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
5019 {
5020 /* TBD */
5021 }
5022
5023 /*
5024 * Set my IPv6 address. Must be called at splimp.
5025 */
5026 static void
5027 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
5028 {
5029 STDDCL;
5030 struct ifaddr_container *ifac;
5031 struct ifaddr *ifa;
5032 struct sockaddr_in6 *sin6;
5033
5034 /*
5035 * Pick the first link-local AF_INET6 address from the list,
5036 * aliases don't make any sense on a p2p link anyway.
5037 */
5038
5039 sin6 = NULL;
5040 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
5041 ifa = ifac->ifa;
5042 if (ifa->ifa_addr->sa_family == AF_INET6) {
5043 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5044 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
5045 break;
5046 }
5047 }
5048
5049 if (ifac != NULL && sin6 != NULL) {
5050 int error;
5051 struct sockaddr_in6 new_sin6 = *sin6;
5052
5053 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5054 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5055 if (debug && error) {
5056 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5057 " failed, error=%d\n", SPP_ARGS(ifp), error);
5058 }
5059 }
5060 }
5061 #endif
5062
5063 /*
5064 * Suggest a candidate address to be used by peer.
5065 */
5066 static void
5067 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5068 {
5069 struct in6_addr myaddr;
5070 struct timeval tv;
5071
5072 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5073
5074 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
5075 microtime(&tv);
5076 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5077 myaddr.s6_addr[14] ^= 0xff;
5078 myaddr.s6_addr[15] ^= 0xff;
5079 } else {
5080 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5081 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5082 }
5083 if (suggest)
5084 bcopy(&myaddr, suggest, sizeof(myaddr));
5085 }
5086 #endif /*INET6*/
5087
5088 static int
5089 sppp_params(struct sppp *sp, u_long cmd, void *data)
5090 {
5091 u_long subcmd;
5092 struct ifreq *ifr = (struct ifreq *)data;
5093 struct spppreq *spr;
5094 int rv = 0;
5095
5096 spr = kmalloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
5097
5098 /*
5099 * ifr->ifr_data is supposed to point to a struct spppreq.
5100 * Check the cmd word first before attempting to fetch all the
5101 * data.
5102 */
5103 if ((subcmd = fuword(ifr->ifr_data)) == -1) {
5104 rv = EFAULT;
5105 goto quit;
5106 }
5107
5108 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5109 rv = EFAULT;
5110 goto quit;
5111 }
5112
5113 switch (subcmd) {
5114 case (int)SPPPIOGDEFS:
5115 if (cmd != SIOCGIFGENERIC) {
5116 rv = EINVAL;
5117 break;
5118 }
5119 /*
5120 * We copy over the entire current state, but clean
5121 * out some of the stuff we don't wanna pass up.
5122 * Remember, SIOCGIFGENERIC is unprotected, and can be
5123 * called by any user. No need to ever get PAP or
5124 * CHAP secrets back to userland anyway.
5125 */
5126 spr->defs.pp_phase = sp->pp_phase;
5127 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5128 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5129 spr->defs.lcp = sp->lcp;
5130 spr->defs.ipcp = sp->ipcp;
5131 spr->defs.ipv6cp = sp->ipv6cp;
5132 spr->defs.myauth = sp->myauth;
5133 spr->defs.hisauth = sp->hisauth;
5134 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5135 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5136 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5137 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5138 /*
5139 * Fixup the LCP timeout value to milliseconds so
5140 * spppcontrol doesn't need to bother about the value
5141 * of "hz". We do the reverse calculation below when
5142 * setting it.
5143 */
5144 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5145 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5146 sizeof(struct spppreq));
5147 break;
5148
5149 case (int)SPPPIOSDEFS:
5150 if (cmd != SIOCSIFGENERIC) {
5151 rv = EINVAL;
5152 break;
5153 }
5154 /*
5155 * We have a very specific idea of which fields we
5156 * allow being passed back from userland, so to not
5157 * clobber our current state. For one, we only allow
5158 * setting anything if LCP is in dead or establish
5159 * phase. Once the authentication negotiations
5160 * started, the authentication settings must not be
5161 * changed again. (The administrator can force an
5162 * ifconfig down in order to get LCP back into dead
5163 * phase.)
5164 *
5165 * Also, we only allow for authentication parameters to be
5166 * specified.
5167 *
5168 * XXX Should allow to set or clear pp_flags.
5169 *
5170 * Finally, if the respective authentication protocol to
5171 * be used is set differently than 0, but the secret is
5172 * passed as all zeros, we don't trash the existing secret.
5173 * This allows an administrator to change the system name
5174 * only without clobbering the secret (which he didn't get
5175 * back in a previous SPPPIOGDEFS call). However, the
5176 * secrets are cleared if the authentication protocol is
5177 * reset to 0. */
5178 if (sp->pp_phase != PHASE_DEAD &&
5179 sp->pp_phase != PHASE_ESTABLISH) {
5180 rv = EBUSY;
5181 break;
5182 }
5183
5184 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5185 spr->defs.myauth.proto != PPP_CHAP) ||
5186 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5187 spr->defs.hisauth.proto != PPP_CHAP)) {
5188 rv = EINVAL;
5189 break;
5190 }
5191
5192 if (spr->defs.myauth.proto == 0)
5193 /* resetting myauth */
5194 bzero(&sp->myauth, sizeof sp->myauth);
5195 else {
5196 /* setting/changing myauth */
5197 sp->myauth.proto = spr->defs.myauth.proto;
5198 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5199 if (spr->defs.myauth.secret[0] != '\0')
5200 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5201 AUTHKEYLEN);
5202 }
5203 if (spr->defs.hisauth.proto == 0)
5204 /* resetting hisauth */
5205 bzero(&sp->hisauth, sizeof sp->hisauth);
5206 else {
5207 /* setting/changing hisauth */
5208 sp->hisauth.proto = spr->defs.hisauth.proto;
5209 sp->hisauth.flags = spr->defs.hisauth.flags;
5210 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5211 if (spr->defs.hisauth.secret[0] != '\0')
5212 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5213 AUTHKEYLEN);
5214 }
5215 /* set LCP restart timer timeout */
5216 if (spr->defs.lcp.timeout != 0)
5217 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5218 /* set VJ enable and IPv6 disable flags */
5219 #ifdef INET
5220 if (spr->defs.enable_vj)
5221 sp->confflags |= CONF_ENABLE_VJ;
5222 else
5223 sp->confflags &= ~CONF_ENABLE_VJ;
5224 #endif
5225 #ifdef INET6
5226 if (spr->defs.enable_ipv6)
5227 sp->confflags |= CONF_ENABLE_IPV6;
5228 else
5229 sp->confflags &= ~CONF_ENABLE_IPV6;
5230 #endif
5231 break;
5232
5233 default:
5234 rv = EINVAL;
5235 }
5236
5237 quit:
5238 kfree(spr, M_TEMP);
5239
5240 return (rv);
5241 }
5242
5243 static void
5244 sppp_phase_network(struct sppp *sp)
5245 {
5246 STDDCL;
5247 int i;
5248 u_long mask;
5249
5250 sp->pp_phase = PHASE_NETWORK;
5251
5252 if (debug)
5253 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5254 sppp_phase_name(sp->pp_phase));
5255
5256 /* Notify NCPs now. */
5257 for (i = 0; i < IDX_COUNT; i++)
5258 if ((cps[i])->flags & CP_NCP)
5259 (cps[i])->Open(sp);
5260
5261 /* Send Up events to all NCPs. */
5262 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5263 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5264 (cps[i])->Up(sp);
5265
5266 /* if no NCP is starting, all this was in vain, close down */
5267 sppp_lcp_check_and_close(sp);
5268 }
5269
5270
5271 static const char *
5272 sppp_cp_type_name(u_char type)
5273 {
5274 static char buf[12];
5275 switch (type) {
5276 case CONF_REQ: return "conf-req";
5277 case CONF_ACK: return "conf-ack";
5278 case CONF_NAK: return "conf-nak";
5279 case CONF_REJ: return "conf-rej";
5280 case TERM_REQ: return "term-req";
5281 case TERM_ACK: return "term-ack";
5282 case CODE_REJ: return "code-rej";
5283 case PROTO_REJ: return "proto-rej";
5284 case ECHO_REQ: return "echo-req";
5285 case ECHO_REPLY: return "echo-reply";
5286 case DISC_REQ: return "discard-req";
5287 }
5288 ksnprintf (buf, sizeof(buf), "cp/0x%x", type);
5289 return buf;
5290 }
5291
5292 static const char *
5293 sppp_auth_type_name(u_short proto, u_char type)
5294 {
5295 static char buf[12];
5296 switch (proto) {
5297 case PPP_CHAP:
5298 switch (type) {
5299 case CHAP_CHALLENGE: return "challenge";
5300 case CHAP_RESPONSE: return "response";
5301 case CHAP_SUCCESS: return "success";
5302 case CHAP_FAILURE: return "failure";
5303 }
5304 case PPP_PAP:
5305 switch (type) {
5306 case PAP_REQ: return "req";
5307 case PAP_ACK: return "ack";
5308 case PAP_NAK: return "nak";
5309 }
5310 }
5311 ksnprintf (buf, sizeof(buf), "auth/0x%x", type);
5312 return buf;
5313 }
5314
5315 static const char *
5316 sppp_lcp_opt_name(u_char opt)
5317 {
5318 static char buf[12];
5319 switch (opt) {
5320 case LCP_OPT_MRU: return "mru";
5321 case LCP_OPT_ASYNC_MAP: return "async-map";
5322 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5323 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5324 case LCP_OPT_MAGIC: return "magic";
5325 case LCP_OPT_PROTO_COMP: return "proto-comp";
5326 case LCP_OPT_ADDR_COMP: return "addr-comp";
5327 }
5328 ksnprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5329 return buf;
5330 }
5331
5332 static const char *
5333 sppp_ipcp_opt_name(u_char opt)
5334 {
5335 static char buf[12];
5336 switch (opt) {
5337 case IPCP_OPT_ADDRESSES: return "addresses";
5338 case IPCP_OPT_COMPRESSION: return "compression";
5339 case IPCP_OPT_ADDRESS: return "address";
5340 }
5341 ksnprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5342 return buf;
5343 }
5344
5345 #ifdef INET6
5346 static const char *
5347 sppp_ipv6cp_opt_name(u_char opt)
5348 {
5349 static char buf[12];
5350 switch (opt) {
5351 case IPV6CP_OPT_IFID: return "ifid";
5352 case IPV6CP_OPT_COMPRESSION: return "compression";
5353 }
5354 ksprintf (buf, "0x%x", opt);
5355 return buf;
5356 }
5357 #endif
5358
5359 static const char *
5360 sppp_state_name(int state)
5361 {
5362 switch (state) {
5363 case STATE_INITIAL: return "initial";
5364 case STATE_STARTING: return "starting";
5365 case STATE_CLOSED: return "closed";
5366 case STATE_STOPPED: return "stopped";
5367 case STATE_CLOSING: return "closing";
5368 case STATE_STOPPING: return "stopping";
5369 case STATE_REQ_SENT: return "req-sent";
5370 case STATE_ACK_RCVD: return "ack-rcvd";
5371 case STATE_ACK_SENT: return "ack-sent";
5372 case STATE_OPENED: return "opened";
5373 }
5374 return "illegal";
5375 }
5376
5377 static const char *
5378 sppp_phase_name(enum ppp_phase phase)
5379 {
5380 switch (phase) {
5381 case PHASE_DEAD: return "dead";
5382 case PHASE_ESTABLISH: return "establish";
5383 case PHASE_TERMINATE: return "terminate";
5384 case PHASE_AUTHENTICATE: return "authenticate";
5385 case PHASE_NETWORK: return "network";
5386 }
5387 return "illegal";
5388 }
5389
5390 static const char *
5391 sppp_proto_name(u_short proto)
5392 {
5393 static char buf[12];
5394 switch (proto) {
5395 case PPP_LCP: return "lcp";
5396 case PPP_IPCP: return "ipcp";
5397 case PPP_PAP: return "pap";
5398 case PPP_CHAP: return "chap";
5399 case PPP_IPV6CP: return "ipv6cp";
5400 }
5401 ksnprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5402 return buf;
5403 }
5404
5405 static void
5406 sppp_print_bytes(const u_char *p, u_short len)
5407 {
5408 if (len)
5409 log(-1, " %*D", len, p, "-");
5410 }
5411
5412 static void
5413 sppp_print_string(const char *p, u_short len)
5414 {
5415 u_char c;
5416
5417 while (len-- > 0) {
5418 c = *p++;
5419 /*
5420 * Print only ASCII chars directly. RFC 1994 recommends
5421 * using only them, but we don't rely on it. */
5422 if (c < ' ' || c > '~')
5423 log(-1, "\\x%x", c);
5424 else
5425 log(-1, "%c", c);
5426 }
5427 }
5428
5429 static const char *
5430 sppp_dotted_quad(u_long addr)
5431 {
5432 static char s[16];
5433 ksprintf(s, "%d.%d.%d.%d",
5434 (int)((addr >> 24) & 0xff),
5435 (int)((addr >> 16) & 0xff),
5436 (int)((addr >> 8) & 0xff),
5437 (int)(addr & 0xff));
5438 return s;
5439 }
5440
5441 static int
5442 sppp_strnlen(u_char *p, int max)
5443 {
5444 int len;
5445
5446 for (len = 0; len < max && *p; ++p)
5447 ++len;
5448 return len;
5449 }
5450
5451 /* a dummy, used to drop uninteresting events */
5452 static void
5453 sppp_null(struct sppp *unused)
5454 {
5455 /* do just nothing */
5456 }
DragonFly BSD