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Merge rev 1.96 of NetBSD's net/if_spppsubr.c:
[dragonfly/netmp.git] / sys / net / sppp / if_spppsubr.c
blobd5a43175fa8b8ab3d3dded4309e239b5698d16bd
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 1.24 2006/08/23 20:43:17 joerg 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 lwkt_serialize_enter(ifp->if_serializer);
972 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr);
973 lwkt_serialize_exit(ifp->if_serializer);
974 }
975 if (rv) {
976 ++ifp->if_oerrors;
977 crit_exit();
978 return(rv);
979 }
980 if (! (ifp->if_flags & IFF_OACTIVE))
981 (*ifp->if_start) (ifp);
982
983 /*
984 * Count output packets and bytes.
985 * The packet length includes header, FCS and 1 flag,
986 * according to RFC 1333.
987 */
988 ifp->if_obytes += m->m_pkthdr.len + 3;
989
990 /*
991 * Unlike in sppp_input(), we can always bump the timestamp
992 * here since sppp_output() is only called on behalf of
993 * network-layer traffic; control-layer traffic is handled
994 * by sppp_cp_send().
995 */
996 sp->pp_last_sent = time_second;
997
998 crit_exit();
999 return (0);
1000 }
1001
1002 void
1003 sppp_attach(struct ifnet *ifp)
1004 {
1005 struct sppp *sp = (struct sppp*) ifp;
1006
1007 /* Initialize keepalive handler. */
1008 if (!spppq) {
1009 callout_reset(&keepalive_timeout, hz * 10,
1010 sppp_keepalive, NULL);
1011 }
1012 /* Insert new entry into the keepalive list. */
1013 sp->pp_next = spppq;
1014 spppq = sp;
1015
1016 sp->pp_if.if_mtu = PP_MTU;
1017 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1018 sp->pp_if.if_type = IFT_PPP;
1019 sp->pp_if.if_output = sppp_output;
1020 #if 0
1021 sp->pp_flags = PP_KEEPALIVE;
1022 #endif
1023 sp->pp_if.if_snd.ifq_maxlen = 32;
1024 sp->pp_fastq.ifq_maxlen = 32;
1025 sp->pp_cpq.ifq_maxlen = 20;
1026 sp->pp_loopcnt = 0;
1027 sp->pp_alivecnt = 0;
1028 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1029 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1030 sp->pp_phase = PHASE_DEAD;
1031 sp->pp_up = lcp.Up;
1032 sp->pp_down = lcp.Down;
1033 sp->pp_last_recv = sp->pp_last_sent = time_second;
1034 sp->confflags = 0;
1035 #ifdef INET
1036 sp->confflags |= CONF_ENABLE_VJ;
1037 #endif
1038 #ifdef INET6
1039 sp->confflags |= CONF_ENABLE_IPV6;
1040 #endif
1041 sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1042 sl_compress_init(sp->pp_comp, -1);
1043 sppp_lcp_init(sp);
1044 sppp_ipcp_init(sp);
1045 sppp_ipv6cp_init(sp);
1046 sppp_pap_init(sp);
1047 sppp_chap_init(sp);
1048 }
1049
1050 void
1051 sppp_detach(struct ifnet *ifp)
1052 {
1053 struct sppp **q, *p, *sp = (struct sppp*) ifp;
1054 int i;
1055
1056 /* Remove the entry from the keepalive list. */
1057 for (q = &spppq; (p = *q); q = &p->pp_next)
1058 if (p == sp) {
1059 *q = p->pp_next;
1060 break;
1061 }
1062
1063 /* Stop keepalive handler. */
1064 if (!spppq)
1065 callout_stop(&keepalive_timeout);
1066
1067 for (i = 0; i < IDX_COUNT; i++)
1068 callout_stop(&sp->timeout[i]);
1069 callout_stop(&sp->pap_my_to);
1070 }
1071
1072 /*
1073 * Flush the interface output queue.
1074 */
1075 void
1076 sppp_flush(struct ifnet *ifp)
1077 {
1078 struct sppp *sp = (struct sppp*) ifp;
1079
1080 ifq_purge(&sp->pp_if.if_snd);
1081 IF_DRAIN(&sp->pp_fastq);
1082 IF_DRAIN(&sp->pp_cpq);
1083 }
1084
1085 /*
1086 * Check if the output queue is empty.
1087 */
1088 int
1089 sppp_isempty(struct ifnet *ifp)
1090 {
1091 struct sppp *sp = (struct sppp*) ifp;
1092 int empty;
1093
1094 crit_enter();
1095 empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1096 ifq_is_empty(&sp->pp_if.if_snd);
1097 crit_exit();
1098 return (empty);
1099 }
1100
1101 /*
1102 * Get next packet to send.
1103 */
1104 struct mbuf *
1105 sppp_dequeue(struct ifnet *ifp)
1106 {
1107 struct sppp *sp = (struct sppp*) ifp;
1108 struct mbuf *m;
1109
1110 crit_enter();
1111
1112 /*
1113 * Process only the control protocol queue until we have at
1114 * least one NCP open.
1115 *
1116 * Do always serve all three queues in Cisco mode.
1117 */
1118 IF_DEQUEUE(&sp->pp_cpq, m);
1119 if (m == NULL &&
1120 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1121 IF_DEQUEUE(&sp->pp_fastq, m);
1122 if (m == NULL)
1123 m = ifq_dequeue(&sp->pp_if.if_snd, NULL);
1124 }
1125
1126 crit_exit();
1127 return m;
1128 }
1129
1130 /*
1131 * Pick the next packet, do not remove it from the queue.
1132 */
1133 struct mbuf *
1134 sppp_pick(struct ifnet *ifp)
1135 {
1136 struct sppp *sp = (struct sppp*)ifp;
1137 struct mbuf *m;
1138
1139 crit_enter();
1140
1141 m = sp->pp_cpq.ifq_head;
1142 if (m == NULL &&
1143 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1144 if ((m = sp->pp_fastq.ifq_head) == NULL)
1145 m = ifq_poll(&sp->pp_if.if_snd);
1146 }
1147
1148 crit_exit();
1149 return (m);
1150 }
1151
1152 /*
1153 * Process an ioctl request. Called on low priority level.
1154 */
1155 int
1156 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1157 {
1158 struct ifreq *ifr = (struct ifreq*) data;
1159 struct sppp *sp = (struct sppp*) ifp;
1160 int rv, going_up, going_down, newmode;
1161
1162 crit_enter();
1163
1164 rv = 0;
1165 switch (cmd) {
1166 case SIOCAIFADDR:
1167 case SIOCSIFDSTADDR:
1168 break;
1169
1170 case SIOCSIFADDR:
1171 /* set the interface "up" when assigning an IP address */
1172 ifp->if_flags |= IFF_UP;
1173 /* fall through... */
1174
1175 case SIOCSIFFLAGS:
1176 going_up = ifp->if_flags & IFF_UP &&
1177 (ifp->if_flags & IFF_RUNNING) == 0;
1178 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1179 ifp->if_flags & IFF_RUNNING;
1180
1181 newmode = ifp->if_flags & IFF_PASSIVE;
1182 if (!newmode)
1183 newmode = ifp->if_flags & IFF_AUTO;
1184 if (!newmode)
1185 newmode = ifp->if_flags & IFF_CISCO;
1186 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1187 ifp->if_flags |= newmode;
1188
1189 if (newmode != sp->pp_mode) {
1190 going_down = 1;
1191 if (!going_up)
1192 going_up = ifp->if_flags & IFF_RUNNING;
1193 }
1194
1195 if (going_down) {
1196 if (sp->pp_mode != IFF_CISCO)
1197 lcp.Close(sp);
1198 else if (sp->pp_tlf)
1199 (sp->pp_tlf)(sp);
1200 sppp_flush(ifp);
1201 ifp->if_flags &= ~IFF_RUNNING;
1202 sp->pp_mode = newmode;
1203 }
1204
1205 if (going_up) {
1206 if (sp->pp_mode != IFF_CISCO)
1207 lcp.Close(sp);
1208 sp->pp_mode = newmode;
1209 if (sp->pp_mode == 0) {
1210 ifp->if_flags |= IFF_RUNNING;
1211 lcp.Open(sp);
1212 }
1213 if (sp->pp_mode == IFF_CISCO) {
1214 if (sp->pp_tls)
1215 (sp->pp_tls)(sp);
1216 ifp->if_flags |= IFF_RUNNING;
1217 }
1218 }
1219
1220 break;
1221
1222 #ifdef SIOCSIFMTU
1223 #ifndef ifr_mtu
1224 #define ifr_mtu ifr_metric
1225 #endif
1226 case SIOCSIFMTU:
1227 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1228 return (EINVAL);
1229 ifp->if_mtu = ifr->ifr_mtu;
1230 break;
1231 #endif
1232 #ifdef SLIOCSETMTU
1233 case SLIOCSETMTU:
1234 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1235 return (EINVAL);
1236 ifp->if_mtu = *(short*)data;
1237 break;
1238 #endif
1239 #ifdef SIOCGIFMTU
1240 case SIOCGIFMTU:
1241 ifr->ifr_mtu = ifp->if_mtu;
1242 break;
1243 #endif
1244 #ifdef SLIOCGETMTU
1245 case SLIOCGETMTU:
1246 *(short*)data = ifp->if_mtu;
1247 break;
1248 #endif
1249 case SIOCADDMULTI:
1250 case SIOCDELMULTI:
1251 break;
1252
1253 case SIOCGIFGENERIC:
1254 case SIOCSIFGENERIC:
1255 rv = sppp_params(sp, cmd, data);
1256 break;
1257
1258 default:
1259 rv = ENOTTY;
1260 }
1261
1262 crit_exit();
1263 return rv;
1264 }
1265
1266 /*
1267 * Cisco framing implementation.
1268 */
1269
1270 /*
1271 * Handle incoming Cisco keepalive protocol packets.
1272 */
1273 static void
1274 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1275 {
1276 STDDCL;
1277 struct cisco_packet *h;
1278 u_long me, mymask;
1279
1280 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1281 if (debug)
1282 log(LOG_DEBUG,
1283 SPP_FMT "cisco invalid packet length: %d bytes\n",
1284 SPP_ARGS(ifp), m->m_pkthdr.len);
1285 return;
1286 }
1287 h = mtod (m, struct cisco_packet*);
1288 if (debug)
1289 log(LOG_DEBUG,
1290 SPP_FMT "cisco input: %d bytes "
1291 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1292 SPP_ARGS(ifp), m->m_pkthdr.len,
1293 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1294 (u_int)h->time0, (u_int)h->time1);
1295 switch (ntohl (h->type)) {
1296 default:
1297 if (debug)
1298 addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
1299 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1300 break;
1301 case CISCO_ADDR_REPLY:
1302 /* Reply on address request, ignore */
1303 break;
1304 case CISCO_KEEPALIVE_REQ:
1305 sp->pp_alivecnt = 0;
1306 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1307 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1308 /* Local and remote sequence numbers are equal.
1309 * Probably, the line is in loopback mode. */
1310 if (sp->pp_loopcnt >= MAXALIVECNT) {
1311 printf (SPP_FMT "loopback\n",
1312 SPP_ARGS(ifp));
1313 sp->pp_loopcnt = 0;
1314 if (ifp->if_flags & IFF_UP) {
1315 if_down (ifp);
1316 IF_DRAIN(&sp->pp_cpq);
1317 }
1318 }
1319 ++sp->pp_loopcnt;
1320
1321 /* Generate new local sequence number */
1322 #if defined(__DragonFly__)
1323 sp->pp_seq[IDX_LCP] = random();
1324 #else
1325 sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1326 #endif
1327 break;
1328 }
1329 sp->pp_loopcnt = 0;
1330 if (! (ifp->if_flags & IFF_UP) &&
1331 (ifp->if_flags & IFF_RUNNING)) {
1332 if_up(ifp);
1333 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1334 }
1335 break;
1336 case CISCO_ADDR_REQ:
1337 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1338 if (me != 0L)
1339 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1340 break;
1341 }
1342 }
1343
1344 /*
1345 * Send Cisco keepalive packet.
1346 */
1347 static void
1348 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1349 {
1350 STDDCL;
1351 struct ppp_header *h;
1352 struct cisco_packet *ch;
1353 struct mbuf *m;
1354 #if defined(__DragonFly__)
1355 struct timeval tv;
1356 #else
1357 u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1358 #endif
1359
1360 #if defined(__DragonFly__)
1361 getmicrouptime(&tv);
1362 #endif
1363
1364 MGETHDR (m, MB_DONTWAIT, MT_DATA);
1365 if (! m)
1366 return;
1367 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1368 m->m_pkthdr.rcvif = 0;
1369
1370 h = mtod (m, struct ppp_header*);
1371 h->address = CISCO_MULTICAST;
1372 h->control = 0;
1373 h->protocol = htons (CISCO_KEEPALIVE);
1374
1375 ch = (struct cisco_packet*) (h + 1);
1376 ch->type = htonl (type);
1377 ch->par1 = htonl (par1);
1378 ch->par2 = htonl (par2);
1379 ch->rel = -1;
1380
1381 #if defined(__DragonFly__)
1382 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1383 ch->time1 = htons ((u_short) tv.tv_sec);
1384 #else
1385 ch->time0 = htons ((u_short) (t >> 16));
1386 ch->time1 = htons ((u_short) t);
1387 #endif
1388
1389 if (debug)
1390 log(LOG_DEBUG,
1391 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1392 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1393 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1394
1395 if (IF_QFULL (&sp->pp_cpq)) {
1396 IF_DROP (&sp->pp_fastq);
1397 IF_DROP (&ifp->if_snd);
1398 m_freem (m);
1399 } else
1400 IF_ENQUEUE (&sp->pp_cpq, m);
1401 if (! (ifp->if_flags & IFF_OACTIVE))
1402 (*ifp->if_start) (ifp);
1403 ifp->if_obytes += m->m_pkthdr.len + 3;
1404 }
1405
1406 /*
1407 * PPP protocol implementation.
1408 */
1409
1410 /*
1411 * Send PPP control protocol packet.
1412 */
1413 static void
1414 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1415 u_char ident, u_short len, void *data)
1416 {
1417 STDDCL;
1418 struct ppp_header *h;
1419 struct lcp_header *lh;
1420 struct mbuf *m;
1421
1422 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1423 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1424 MGETHDR (m, MB_DONTWAIT, MT_DATA);
1425 if (! m)
1426 return;
1427 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1428 m->m_pkthdr.rcvif = 0;
1429
1430 h = mtod (m, struct ppp_header*);
1431 h->address = PPP_ALLSTATIONS; /* broadcast address */
1432 h->control = PPP_UI; /* Unnumbered Info */
1433 h->protocol = htons (proto); /* Link Control Protocol */
1434
1435 lh = (struct lcp_header*) (h + 1);
1436 lh->type = type;
1437 lh->ident = ident;
1438 lh->len = htons (LCP_HEADER_LEN + len);
1439 if (len)
1440 bcopy (data, lh+1, len);
1441
1442 if (debug) {
1443 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1444 SPP_ARGS(ifp),
1445 sppp_proto_name(proto),
1446 sppp_cp_type_name (lh->type), lh->ident,
1447 ntohs (lh->len));
1448 sppp_print_bytes ((u_char*) (lh+1), len);
1449 addlog(">\n");
1450 }
1451 if (IF_QFULL (&sp->pp_cpq)) {
1452 IF_DROP (&sp->pp_fastq);
1453 IF_DROP (&ifp->if_snd);
1454 m_freem (m);
1455 ++ifp->if_oerrors;
1456 } else
1457 IF_ENQUEUE (&sp->pp_cpq, m);
1458 if (! (ifp->if_flags & IFF_OACTIVE))
1459 (*ifp->if_start) (ifp);
1460 ifp->if_obytes += m->m_pkthdr.len + 3;
1461 }
1462
1463 /*
1464 * Handle incoming PPP control protocol packets.
1465 */
1466 static void
1467 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1468 {
1469 STDDCL;
1470 struct lcp_header *h;
1471 int printlen, len = m->m_pkthdr.len;
1472 int rv;
1473 u_char *p;
1474
1475 if (len < 4) {
1476 if (debug)
1477 log(LOG_DEBUG,
1478 SPP_FMT "%s invalid packet length: %d bytes\n",
1479 SPP_ARGS(ifp), cp->name, len);
1480 return;
1481 }
1482 h = mtod (m, struct lcp_header*);
1483 if (debug) {
1484 printlen = ntohs(h->len);
1485 log(LOG_DEBUG,
1486 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1487 SPP_ARGS(ifp), cp->name,
1488 sppp_state_name(sp->state[cp->protoidx]),
1489 sppp_cp_type_name (h->type), h->ident, printlen);
1490 if (len < printlen)
1491 printlen = len;
1492 if (printlen > 4)
1493 sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1494 addlog(">\n");
1495 }
1496 if (len > ntohs (h->len))
1497 len = ntohs (h->len);
1498 p = (u_char *)(h + 1);
1499 switch (h->type) {
1500 case CONF_REQ:
1501 if (len < 4) {
1502 if (debug)
1503 addlog(SPP_FMT "%s invalid conf-req length %d\n",
1504 SPP_ARGS(ifp), cp->name,
1505 len);
1506 ++ifp->if_ierrors;
1507 break;
1508 }
1509 /* handle states where RCR doesn't get a SCA/SCN */
1510 switch (sp->state[cp->protoidx]) {
1511 case STATE_CLOSING:
1512 case STATE_STOPPING:
1513 return;
1514 case STATE_CLOSED:
1515 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1516 0, 0);
1517 return;
1518 }
1519 rv = (cp->RCR)(sp, h, len);
1520 if (rv < 0) {
1521 /* fatal error, shut down */
1522 (cp->tld)(sp);
1523 sppp_lcp_tlf(sp);
1524 return;
1525 }
1526 switch (sp->state[cp->protoidx]) {
1527 case STATE_OPENED:
1528 (cp->tld)(sp);
1529 (cp->scr)(sp);
1530 /* fall through... */
1531 case STATE_ACK_SENT:
1532 case STATE_REQ_SENT:
1533 /*
1534 * sppp_cp_change_state() have the side effect of
1535 * restarting the timeouts. We want to avoid that
1536 * if the state don't change, otherwise we won't
1537 * ever timeout and resend a configuration request
1538 * that got lost.
1539 */
1540 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1541 STATE_REQ_SENT))
1542 break;
1543 sppp_cp_change_state(cp, sp, rv?
1544 STATE_ACK_SENT: STATE_REQ_SENT);
1545 break;
1546 case STATE_STOPPED:
1547 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1548 (cp->scr)(sp);
1549 sppp_cp_change_state(cp, sp, rv?
1550 STATE_ACK_SENT: STATE_REQ_SENT);
1551 break;
1552 case STATE_ACK_RCVD:
1553 if (rv) {
1554 sppp_cp_change_state(cp, sp, STATE_OPENED);
1555 if (debug)
1556 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1557 SPP_ARGS(ifp),
1558 cp->name);
1559 (cp->tlu)(sp);
1560 } else
1561 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1562 break;
1563 default:
1564 printf(SPP_FMT "%s illegal %s in state %s\n",
1565 SPP_ARGS(ifp), cp->name,
1566 sppp_cp_type_name(h->type),
1567 sppp_state_name(sp->state[cp->protoidx]));
1568 ++ifp->if_ierrors;
1569 }
1570 break;
1571 case CONF_ACK:
1572 if (h->ident != sp->confid[cp->protoidx]) {
1573 if (debug)
1574 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1575 SPP_ARGS(ifp), cp->name,
1576 h->ident, sp->confid[cp->protoidx]);
1577 ++ifp->if_ierrors;
1578 break;
1579 }
1580 switch (sp->state[cp->protoidx]) {
1581 case STATE_CLOSED:
1582 case STATE_STOPPED:
1583 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1584 break;
1585 case STATE_CLOSING:
1586 case STATE_STOPPING:
1587 break;
1588 case STATE_REQ_SENT:
1589 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1590 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1591 break;
1592 case STATE_OPENED:
1593 (cp->tld)(sp);
1594 /* fall through */
1595 case STATE_ACK_RCVD:
1596 (cp->scr)(sp);
1597 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1598 break;
1599 case STATE_ACK_SENT:
1600 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1601 sppp_cp_change_state(cp, sp, STATE_OPENED);
1602 if (debug)
1603 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1604 SPP_ARGS(ifp), cp->name);
1605 (cp->tlu)(sp);
1606 break;
1607 default:
1608 printf(SPP_FMT "%s illegal %s in state %s\n",
1609 SPP_ARGS(ifp), cp->name,
1610 sppp_cp_type_name(h->type),
1611 sppp_state_name(sp->state[cp->protoidx]));
1612 ++ifp->if_ierrors;
1613 }
1614 break;
1615 case CONF_NAK:
1616 case CONF_REJ:
1617 if (h->ident != sp->confid[cp->protoidx]) {
1618 if (debug)
1619 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1620 SPP_ARGS(ifp), cp->name,
1621 h->ident, sp->confid[cp->protoidx]);
1622 ++ifp->if_ierrors;
1623 break;
1624 }
1625 if (h->type == CONF_NAK)
1626 (cp->RCN_nak)(sp, h, len);
1627 else /* CONF_REJ */
1628 (cp->RCN_rej)(sp, h, len);
1629
1630 switch (sp->state[cp->protoidx]) {
1631 case STATE_CLOSED:
1632 case STATE_STOPPED:
1633 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1634 break;
1635 case STATE_REQ_SENT:
1636 case STATE_ACK_SENT:
1637 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1638 /*
1639 * Slow things down a bit if we think we might be
1640 * in loopback. Depend on the timeout to send the
1641 * next configuration request.
1642 */
1643 if (sp->pp_loopcnt)
1644 break;
1645 (cp->scr)(sp);
1646 break;
1647 case STATE_OPENED:
1648 (cp->tld)(sp);
1649 /* fall through */
1650 case STATE_ACK_RCVD:
1651 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1652 (cp->scr)(sp);
1653 break;
1654 case STATE_CLOSING:
1655 case STATE_STOPPING:
1656 break;
1657 default:
1658 printf(SPP_FMT "%s illegal %s in state %s\n",
1659 SPP_ARGS(ifp), cp->name,
1660 sppp_cp_type_name(h->type),
1661 sppp_state_name(sp->state[cp->protoidx]));
1662 ++ifp->if_ierrors;
1663 }
1664 break;
1665
1666 case TERM_REQ:
1667 switch (sp->state[cp->protoidx]) {
1668 case STATE_ACK_RCVD:
1669 case STATE_ACK_SENT:
1670 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1671 /* fall through */
1672 case STATE_CLOSED:
1673 case STATE_STOPPED:
1674 case STATE_CLOSING:
1675 case STATE_STOPPING:
1676 case STATE_REQ_SENT:
1677 sta:
1678 /* Send Terminate-Ack packet. */
1679 if (debug)
1680 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1681 SPP_ARGS(ifp), cp->name);
1682 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1683 break;
1684 case STATE_OPENED:
1685 (cp->tld)(sp);
1686 sp->rst_counter[cp->protoidx] = 0;
1687 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1688 goto sta;
1689 break;
1690 default:
1691 printf(SPP_FMT "%s illegal %s in state %s\n",
1692 SPP_ARGS(ifp), cp->name,
1693 sppp_cp_type_name(h->type),
1694 sppp_state_name(sp->state[cp->protoidx]));
1695 ++ifp->if_ierrors;
1696 }
1697 break;
1698 case TERM_ACK:
1699 switch (sp->state[cp->protoidx]) {
1700 case STATE_CLOSED:
1701 case STATE_STOPPED:
1702 case STATE_REQ_SENT:
1703 case STATE_ACK_SENT:
1704 break;
1705 case STATE_CLOSING:
1706 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1707 (cp->tlf)(sp);
1708 break;
1709 case STATE_STOPPING:
1710 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1711 (cp->tlf)(sp);
1712 break;
1713 case STATE_ACK_RCVD:
1714 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1715 break;
1716 case STATE_OPENED:
1717 (cp->tld)(sp);
1718 (cp->scr)(sp);
1719 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1720 break;
1721 default:
1722 printf(SPP_FMT "%s illegal %s in state %s\n",
1723 SPP_ARGS(ifp), cp->name,
1724 sppp_cp_type_name(h->type),
1725 sppp_state_name(sp->state[cp->protoidx]));
1726 ++ifp->if_ierrors;
1727 }
1728 break;
1729 case CODE_REJ:
1730 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1731 log(LOG_INFO,
1732 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1733 "danger will robinson\n",
1734 SPP_ARGS(ifp), cp->name,
1735 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1736 switch (sp->state[cp->protoidx]) {
1737 case STATE_CLOSED:
1738 case STATE_STOPPED:
1739 case STATE_REQ_SENT:
1740 case STATE_ACK_SENT:
1741 case STATE_CLOSING:
1742 case STATE_STOPPING:
1743 case STATE_OPENED:
1744 break;
1745 case STATE_ACK_RCVD:
1746 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1747 break;
1748 default:
1749 printf(SPP_FMT "%s illegal %s in state %s\n",
1750 SPP_ARGS(ifp), cp->name,
1751 sppp_cp_type_name(h->type),
1752 sppp_state_name(sp->state[cp->protoidx]));
1753 ++ifp->if_ierrors;
1754 }
1755 break;
1756 case PROTO_REJ:
1757 {
1758 int catastrophic;
1759 const struct cp *upper;
1760 int i;
1761 u_int16_t proto;
1762
1763 catastrophic = 0;
1764 upper = NULL;
1765 proto = ntohs(*((u_int16_t *)p));
1766 for (i = 0; i < IDX_COUNT; i++) {
1767 if (cps[i]->proto == proto) {
1768 upper = cps[i];
1769 break;
1770 }
1771 }
1772 if (upper == NULL)
1773 catastrophic++;
1774
1775 if (catastrophic || debug)
1776 log(catastrophic? LOG_INFO: LOG_DEBUG,
1777 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1778 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1779 sppp_cp_type_name(h->type), proto,
1780 upper ? upper->name : "unknown",
1781 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1782
1783 /*
1784 * if we got RXJ+ against conf-req, the peer does not implement
1785 * this particular protocol type. terminate the protocol.
1786 */
1787 if (upper && !catastrophic) {
1788 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1789 upper->Close(sp);
1790 break;
1791 }
1792 }
1793
1794 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1795 switch (sp->state[cp->protoidx]) {
1796 case STATE_CLOSED:
1797 case STATE_STOPPED:
1798 case STATE_REQ_SENT:
1799 case STATE_ACK_SENT:
1800 case STATE_CLOSING:
1801 case STATE_STOPPING:
1802 case STATE_OPENED:
1803 break;
1804 case STATE_ACK_RCVD:
1805 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1806 break;
1807 default:
1808 printf(SPP_FMT "%s illegal %s in state %s\n",
1809 SPP_ARGS(ifp), cp->name,
1810 sppp_cp_type_name(h->type),
1811 sppp_state_name(sp->state[cp->protoidx]));
1812 ++ifp->if_ierrors;
1813 }
1814 break;
1815 }
1816 case DISC_REQ:
1817 if (cp->proto != PPP_LCP)
1818 goto illegal;
1819 /* Discard the packet. */
1820 break;
1821 case ECHO_REQ:
1822 if (cp->proto != PPP_LCP)
1823 goto illegal;
1824 if (sp->state[cp->protoidx] != STATE_OPENED) {
1825 if (debug)
1826 addlog(SPP_FMT "lcp echo req but lcp closed\n",
1827 SPP_ARGS(ifp));
1828 ++ifp->if_ierrors;
1829 break;
1830 }
1831 if (len < 8) {
1832 if (debug)
1833 addlog(SPP_FMT "invalid lcp echo request "
1834 "packet length: %d bytes\n",
1835 SPP_ARGS(ifp), len);
1836 break;
1837 }
1838 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1839 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1840 /* Line loopback mode detected. */
1841 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1842 sp->pp_loopcnt = MAXALIVECNT * 5;
1843 if_down (ifp);
1844 IF_DRAIN(&sp->pp_cpq);
1845
1846 /* Shut down the PPP link. */
1847 /* XXX */
1848 lcp.Down(sp);
1849 lcp.Up(sp);
1850 break;
1851 }
1852 *(long*)(h+1) = htonl (sp->lcp.magic);
1853 if (debug)
1854 addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
1855 SPP_ARGS(ifp));
1856 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1857 break;
1858 case ECHO_REPLY:
1859 if (cp->proto != PPP_LCP)
1860 goto illegal;
1861 if (h->ident != sp->lcp.echoid) {
1862 ++ifp->if_ierrors;
1863 break;
1864 }
1865 if (len < 8) {
1866 if (debug)
1867 addlog(SPP_FMT "lcp invalid echo reply "
1868 "packet length: %d bytes\n",
1869 SPP_ARGS(ifp), len);
1870 break;
1871 }
1872 if (debug)
1873 addlog(SPP_FMT "lcp got echo rep\n",
1874 SPP_ARGS(ifp));
1875 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1876 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1877 sp->pp_alivecnt = 0;
1878 break;
1879 default:
1880 /* Unknown packet type -- send Code-Reject packet. */
1881 illegal:
1882 if (debug)
1883 addlog(SPP_FMT "%s send code-rej for 0x%x\n",
1884 SPP_ARGS(ifp), cp->name, h->type);
1885 sppp_cp_send(sp, cp->proto, CODE_REJ,
1886 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1887 ++ifp->if_ierrors;
1888 }
1889 }
1890
1891
1892 /*
1893 * The generic part of all Up/Down/Open/Close/TO event handlers.
1894 * Basically, the state transition handling in the automaton.
1895 */
1896 static void
1897 sppp_up_event(const struct cp *cp, struct sppp *sp)
1898 {
1899 STDDCL;
1900
1901 if (debug)
1902 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1903 SPP_ARGS(ifp), cp->name,
1904 sppp_state_name(sp->state[cp->protoidx]));
1905
1906 switch (sp->state[cp->protoidx]) {
1907 case STATE_INITIAL:
1908 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1909 break;
1910 case STATE_STARTING:
1911 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1912 (cp->scr)(sp);
1913 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1914 break;
1915 default:
1916 printf(SPP_FMT "%s illegal up in state %s\n",
1917 SPP_ARGS(ifp), cp->name,
1918 sppp_state_name(sp->state[cp->protoidx]));
1919 }
1920 }
1921
1922 static void
1923 sppp_down_event(const struct cp *cp, struct sppp *sp)
1924 {
1925 STDDCL;
1926
1927 if (debug)
1928 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1929 SPP_ARGS(ifp), cp->name,
1930 sppp_state_name(sp->state[cp->protoidx]));
1931
1932 switch (sp->state[cp->protoidx]) {
1933 case STATE_CLOSED:
1934 case STATE_CLOSING:
1935 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1936 break;
1937 case STATE_STOPPED:
1938 sppp_cp_change_state(cp, sp, STATE_STARTING);
1939 (cp->tls)(sp);
1940 break;
1941 case STATE_STOPPING:
1942 case STATE_REQ_SENT:
1943 case STATE_ACK_RCVD:
1944 case STATE_ACK_SENT:
1945 sppp_cp_change_state(cp, sp, STATE_STARTING);
1946 break;
1947 case STATE_OPENED:
1948 (cp->tld)(sp);
1949 sppp_cp_change_state(cp, sp, STATE_STARTING);
1950 break;
1951 default:
1952 printf(SPP_FMT "%s illegal down in state %s\n",
1953 SPP_ARGS(ifp), cp->name,
1954 sppp_state_name(sp->state[cp->protoidx]));
1955 }
1956 }
1957
1958
1959 static void
1960 sppp_open_event(const struct cp *cp, struct sppp *sp)
1961 {
1962 STDDCL;
1963
1964 if (debug)
1965 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1966 SPP_ARGS(ifp), cp->name,
1967 sppp_state_name(sp->state[cp->protoidx]));
1968
1969 switch (sp->state[cp->protoidx]) {
1970 case STATE_INITIAL:
1971 sppp_cp_change_state(cp, sp, STATE_STARTING);
1972 (cp->tls)(sp);
1973 break;
1974 case STATE_STARTING:
1975 break;
1976 case STATE_CLOSED:
1977 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1978 (cp->scr)(sp);
1979 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1980 break;
1981 case STATE_STOPPED:
1982 /*
1983 * Try escaping stopped state. This seems to bite
1984 * people occasionally, in particular for IPCP,
1985 * presumably following previous IPCP negotiation
1986 * aborts. Somehow, we must have missed a Down event
1987 * which would have caused a transition into starting
1988 * state, so as a bandaid we force the Down event now.
1989 * This effectively implements (something like the)
1990 * `restart' option mentioned in the state transition
1991 * table of RFC 1661.
1992 */
1993 sppp_cp_change_state(cp, sp, STATE_STARTING);
1994 (cp->tls)(sp);
1995 break;
1996 case STATE_STOPPING:
1997 case STATE_REQ_SENT:
1998 case STATE_ACK_RCVD:
1999 case STATE_ACK_SENT:
2000 case STATE_OPENED:
2001 break;
2002 case STATE_CLOSING:
2003 sppp_cp_change_state(cp, sp, STATE_STOPPING);
2004 break;
2005 }
2006 }
2007
2008
2009 static void
2010 sppp_close_event(const struct cp *cp, struct sppp *sp)
2011 {
2012 STDDCL;
2013
2014 if (debug)
2015 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2016 SPP_ARGS(ifp), cp->name,
2017 sppp_state_name(sp->state[cp->protoidx]));
2018
2019 switch (sp->state[cp->protoidx]) {
2020 case STATE_INITIAL:
2021 case STATE_CLOSED:
2022 case STATE_CLOSING:
2023 break;
2024 case STATE_STARTING:
2025 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2026 (cp->tlf)(sp);
2027 break;
2028 case STATE_STOPPED:
2029 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2030 break;
2031 case STATE_STOPPING:
2032 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2033 break;
2034 case STATE_OPENED:
2035 (cp->tld)(sp);
2036 /* fall through */
2037 case STATE_REQ_SENT:
2038 case STATE_ACK_RCVD:
2039 case STATE_ACK_SENT:
2040 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2041 sppp_cp_send(sp, cp->proto, TERM_REQ,
2042 ++sp->pp_seq[cp->protoidx], 0, 0);
2043 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2044 break;
2045 }
2046 }
2047
2048 static void
2049 sppp_to_event(const struct cp *cp, struct sppp *sp)
2050 {
2051 STDDCL;
2052
2053 crit_enter();
2054
2055 if (debug)
2056 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2057 SPP_ARGS(ifp), cp->name,
2058 sppp_state_name(sp->state[cp->protoidx]),
2059 sp->rst_counter[cp->protoidx]);
2060
2061 if (--sp->rst_counter[cp->protoidx] < 0)
2062 /* TO- event */
2063 switch (sp->state[cp->protoidx]) {
2064 case STATE_CLOSING:
2065 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2066 (cp->tlf)(sp);
2067 break;
2068 case STATE_STOPPING:
2069 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2070 (cp->tlf)(sp);
2071 break;
2072 case STATE_REQ_SENT:
2073 case STATE_ACK_RCVD:
2074 case STATE_ACK_SENT:
2075 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2076 (cp->tlf)(sp);
2077 break;
2078 }
2079 else
2080 /* TO+ event */
2081 switch (sp->state[cp->protoidx]) {
2082 case STATE_CLOSING:
2083 case STATE_STOPPING:
2084 sppp_cp_send(sp, cp->proto, TERM_REQ,
2085 ++sp->pp_seq[cp->protoidx], 0, 0);
2086 callout_reset(&sp->timeout[cp->protoidx],
2087 sp->lcp.timeout, cp->TO, sp);
2088 break;
2089 case STATE_REQ_SENT:
2090 case STATE_ACK_RCVD:
2091 (cp->scr)(sp);
2092 /* sppp_cp_change_state() will restart the timer */
2093 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2094 break;
2095 case STATE_ACK_SENT:
2096 (cp->scr)(sp);
2097 callout_reset(&sp->timeout[cp->protoidx],
2098 sp->lcp.timeout, cp->TO, sp);
2099 break;
2100 }
2101
2102 crit_exit();
2103 }
2104
2105 /*
2106 * Change the state of a control protocol in the state automaton.
2107 * Takes care of starting/stopping the restart timer.
2108 */
2109 void
2110 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2111 {
2112 sp->state[cp->protoidx] = newstate;
2113 callout_stop(&sp->timeout[cp->protoidx]);
2114
2115 switch (newstate) {
2116 case STATE_INITIAL:
2117 case STATE_STARTING:
2118 case STATE_CLOSED:
2119 case STATE_STOPPED:
2120 case STATE_OPENED:
2121 break;
2122 case STATE_CLOSING:
2123 case STATE_STOPPING:
2124 case STATE_REQ_SENT:
2125 case STATE_ACK_RCVD:
2126 case STATE_ACK_SENT:
2127 callout_reset(&sp->timeout[cp->protoidx],
2128 sp->lcp.timeout, cp->TO, sp);
2129 break;
2130 }
2131 }
2132
2133 /*
2134 *--------------------------------------------------------------------------*
2135 * *
2136 * The LCP implementation. *
2137 * *
2138 *--------------------------------------------------------------------------*
2139 */
2140 static void
2141 sppp_lcp_init(struct sppp *sp)
2142 {
2143 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2144 sp->lcp.magic = 0;
2145 sp->state[IDX_LCP] = STATE_INITIAL;
2146 sp->fail_counter[IDX_LCP] = 0;
2147 sp->pp_seq[IDX_LCP] = 0;
2148 sp->pp_rseq[IDX_LCP] = 0;
2149 sp->lcp.protos = 0;
2150 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2151
2152 /* Note that these values are relevant for all control protocols */
2153 sp->lcp.timeout = 3 * hz;
2154 sp->lcp.max_terminate = 2;
2155 sp->lcp.max_configure = 10;
2156 sp->lcp.max_failure = 10;
2157 #if defined(__DragonFly__)
2158 callout_init(&sp->timeout[IDX_LCP]);
2159 #endif
2160 }
2161
2162 static void
2163 sppp_lcp_up(struct sppp *sp)
2164 {
2165 STDDCL;
2166
2167 sp->pp_alivecnt = 0;
2168 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2169 sp->lcp.magic = 0;
2170 sp->lcp.protos = 0;
2171 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2172 /*
2173 * If this interface is passive or dial-on-demand, and we are
2174 * still in Initial state, it means we've got an incoming
2175 * call. Activate the interface.
2176 */
2177 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2178 if (debug)
2179 log(LOG_DEBUG,
2180 SPP_FMT "Up event", SPP_ARGS(ifp));
2181 ifp->if_flags |= IFF_RUNNING;
2182 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2183 if (debug)
2184 addlog("(incoming call)\n");
2185 sp->pp_flags |= PP_CALLIN;
2186 lcp.Open(sp);
2187 } else if (debug)
2188 addlog("\n");
2189 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2190 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2191 ifp->if_flags |= IFF_RUNNING;
2192 lcp.Open(sp);
2193 }
2194
2195 sppp_up_event(&lcp, sp);
2196 }
2197
2198 static void
2199 sppp_lcp_down(struct sppp *sp)
2200 {
2201 STDDCL;
2202
2203 sppp_down_event(&lcp, sp);
2204
2205 /*
2206 * If this is neither a dial-on-demand nor a passive
2207 * interface, simulate an ``ifconfig down'' action, so the
2208 * administrator can force a redial by another ``ifconfig
2209 * up''. XXX For leased line operation, should we immediately
2210 * try to reopen the connection here?
2211 */
2212 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2213 log(LOG_INFO,
2214 SPP_FMT "Down event, taking interface down.\n",
2215 SPP_ARGS(ifp));
2216 if_down(ifp);
2217 } else {
2218 if (debug)
2219 log(LOG_DEBUG,
2220 SPP_FMT "Down event (carrier loss)\n",
2221 SPP_ARGS(ifp));
2222 sp->pp_flags &= ~PP_CALLIN;
2223 if (sp->state[IDX_LCP] != STATE_INITIAL)
2224 lcp.Close(sp);
2225 ifp->if_flags &= ~IFF_RUNNING;
2226 }
2227 }
2228
2229 static void
2230 sppp_lcp_open(struct sppp *sp)
2231 {
2232 /*
2233 * If we are authenticator, negotiate LCP_AUTH
2234 */
2235 if (sp->hisauth.proto != 0)
2236 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2237 else
2238 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2239 sp->pp_flags &= ~PP_NEEDAUTH;
2240 sppp_open_event(&lcp, sp);
2241 }
2242
2243 static void
2244 sppp_lcp_close(struct sppp *sp)
2245 {
2246 sppp_close_event(&lcp, sp);
2247 }
2248
2249 static void
2250 sppp_lcp_TO(void *cookie)
2251 {
2252 sppp_to_event(&lcp, (struct sppp *)cookie);
2253 }
2254
2255 /*
2256 * Analyze a configure request. Return true if it was agreeable, and
2257 * caused action sca, false if it has been rejected or nak'ed, and
2258 * caused action scn. (The return value is used to make the state
2259 * transition decision in the state automaton.)
2260 */
2261 static int
2262 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2263 {
2264 STDDCL;
2265 u_char *buf, *r, *p;
2266 int origlen, rlen;
2267 u_long nmagic;
2268 u_short authproto;
2269
2270 len -= 4;
2271 origlen = len;
2272 buf = r = malloc (len, M_TEMP, M_INTWAIT);
2273
2274 if (debug)
2275 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2276 SPP_ARGS(ifp));
2277
2278 /* pass 1: check for things that need to be rejected */
2279 p = (void*) (h+1);
2280 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2281 /* Sanity check option length */
2282 if (p[1] > len) {
2283 /* Malicious option - drop immediately.
2284 * XXX Maybe we should just RXJ it?
2285 */
2286 addlog("%s: received malicious LCP option 0x%02x, "
2287 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2288 p[0], p[1], len);
2289 goto drop;
2290 }
2291 if (debug)
2292 addlog(" %s ", sppp_lcp_opt_name(*p));
2293 switch (*p) {
2294 case LCP_OPT_MAGIC:
2295 /* Magic number. */
2296 if (len >= 6 && p[1] == 6)
2297 continue;
2298 if (debug)
2299 addlog("[invalid] ");
2300 break;
2301 case LCP_OPT_ASYNC_MAP:
2302 /* Async control character map. */
2303 if (len >= 6 && p[1] == 6)
2304 continue;
2305 if (debug)
2306 addlog("[invalid] ");
2307 break;
2308 case LCP_OPT_MRU:
2309 /* Maximum receive unit. */
2310 if (len >= 4 && p[1] == 4)
2311 continue;
2312 if (debug)
2313 addlog("[invalid] ");
2314 break;
2315 case LCP_OPT_AUTH_PROTO:
2316 if (len < 4) {
2317 if (debug)
2318 addlog("[invalid] ");
2319 break;
2320 }
2321 authproto = (p[2] << 8) + p[3];
2322 if (authproto == PPP_CHAP && p[1] != 5) {
2323 if (debug)
2324 addlog("[invalid chap len] ");
2325 break;
2326 }
2327 if (sp->myauth.proto == 0) {
2328 /* we are not configured to do auth */
2329 if (debug)
2330 addlog("[not configured] ");
2331 break;
2332 }
2333 /*
2334 * Remote want us to authenticate, remember this,
2335 * so we stay in PHASE_AUTHENTICATE after LCP got
2336 * up.
2337 */
2338 sp->pp_flags |= PP_NEEDAUTH;
2339 continue;
2340 default:
2341 /* Others not supported. */
2342 if (debug)
2343 addlog("[rej] ");
2344 break;
2345 }
2346 /* Add the option to rejected list. */
2347 bcopy (p, r, p[1]);
2348 r += p[1];
2349 rlen += p[1];
2350 }
2351 if (rlen) {
2352 if (debug)
2353 addlog(" send conf-rej\n");
2354 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2355 return 0;
2356 } else if (debug)
2357 addlog("\n");
2358
2359 /*
2360 * pass 2: check for option values that are unacceptable and
2361 * thus require to be nak'ed.
2362 */
2363 if (debug)
2364 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2365 SPP_ARGS(ifp));
2366
2367 p = (void*) (h+1);
2368 len = origlen;
2369 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2370 if (debug)
2371 addlog(" %s ", sppp_lcp_opt_name(*p));
2372 switch (*p) {
2373 case LCP_OPT_MAGIC:
2374 /* Magic number -- extract. */
2375 nmagic = (u_long)p[2] << 24 |
2376 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2377 if (nmagic != sp->lcp.magic) {
2378 sp->pp_loopcnt = 0;
2379 if (debug)
2380 addlog("0x%lx ", nmagic);
2381 continue;
2382 }
2383 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2384 addlog("[glitch] ");
2385 ++sp->pp_loopcnt;
2386 /*
2387 * We negate our magic here, and NAK it. If
2388 * we see it later in an NAK packet, we
2389 * suggest a new one.
2390 */
2391 nmagic = ~sp->lcp.magic;
2392 /* Gonna NAK it. */
2393 p[2] = nmagic >> 24;
2394 p[3] = nmagic >> 16;
2395 p[4] = nmagic >> 8;
2396 p[5] = nmagic;
2397 break;
2398
2399 case LCP_OPT_ASYNC_MAP:
2400 /*
2401 * Async control character map -- just ignore it.
2402 *
2403 * Quote from RFC 1662, chapter 6:
2404 * To enable this functionality, synchronous PPP
2405 * implementations MUST always respond to the
2406 * Async-Control-Character-Map Configuration
2407 * Option with the LCP Configure-Ack. However,
2408 * acceptance of the Configuration Option does
2409 * not imply that the synchronous implementation
2410 * will do any ACCM mapping. Instead, all such
2411 * octet mapping will be performed by the
2412 * asynchronous-to-synchronous converter.
2413 */
2414 continue;
2415
2416 case LCP_OPT_MRU:
2417 /*
2418 * Maximum receive unit. Always agreeable,
2419 * but ignored by now.
2420 */
2421 sp->lcp.their_mru = p[2] * 256 + p[3];
2422 if (debug)
2423 addlog("%lu ", sp->lcp.their_mru);
2424 continue;
2425
2426 case LCP_OPT_AUTH_PROTO:
2427 authproto = (p[2] << 8) + p[3];
2428 if (sp->myauth.proto != authproto) {
2429 /* not agreed, nak */
2430 if (debug)
2431 addlog("[mine %s != his %s] ",
2432 sppp_proto_name(sp->hisauth.proto),
2433 sppp_proto_name(authproto));
2434 p[2] = sp->myauth.proto >> 8;
2435 p[3] = sp->myauth.proto;
2436 break;
2437 }
2438 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2439 if (debug)
2440 addlog("[chap not MD5] ");
2441 p[4] = CHAP_MD5;
2442 break;
2443 }
2444 continue;
2445 }
2446 /* Add the option to nak'ed list. */
2447 bcopy (p, r, p[1]);
2448 r += p[1];
2449 rlen += p[1];
2450 }
2451 if (rlen) {
2452 /*
2453 * Local and remote magics equal -- loopback?
2454 */
2455 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2456 if (sp->pp_loopcnt == MAXALIVECNT*5)
2457 printf (SPP_FMT "loopback\n",
2458 SPP_ARGS(ifp));
2459 if (ifp->if_flags & IFF_UP) {
2460 if_down(ifp);
2461 IF_DRAIN(&sp->pp_cpq);
2462 /* XXX ? */
2463 lcp.Down(sp);
2464 lcp.Up(sp);
2465 }
2466 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2467 if (debug)
2468 addlog(" max_failure (%d) exceeded, "
2469 "send conf-rej\n",
2470 sp->lcp.max_failure);
2471 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2472 } else {
2473 if (debug)
2474 addlog(" send conf-nak\n");
2475 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2476 }
2477 } else {
2478 if (debug)
2479 addlog(" send conf-ack\n");
2480 sp->fail_counter[IDX_LCP] = 0;
2481 sp->pp_loopcnt = 0;
2482 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2483 h->ident, origlen, h+1);
2484 }
2485
2486 free (buf, M_TEMP);
2487 return (rlen == 0);
2488
2489 drop:
2490 free(buf, M_TEMP);
2491 return (-1);
2492 }
2493
2494 /*
2495 * Analyze the LCP Configure-Reject option list, and adjust our
2496 * negotiation.
2497 */
2498 static void
2499 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2500 {
2501 STDDCL;
2502 u_char *buf, *p;
2503
2504 len -= 4;
2505 buf = malloc (len, M_TEMP, M_INTWAIT);
2506
2507 if (debug)
2508 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2509 SPP_ARGS(ifp));
2510
2511 p = (void*) (h+1);
2512 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2513 /* Sanity check option length */
2514 if (p[1] > len) {
2515 /*
2516 * Malicious option - drop immediately.
2517 * XXX Maybe we should just RXJ it?
2518 */
2519 addlog("%s: received malicious LCP option, "
2520 "dropping.\n", ifp->if_xname);
2521 goto drop;
2522 }
2523 if (debug)
2524 addlog(" %s ", sppp_lcp_opt_name(*p));
2525 switch (*p) {
2526 case LCP_OPT_MAGIC:
2527 /* Magic number -- can't use it, use 0 */
2528 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2529 sp->lcp.magic = 0;
2530 break;
2531 case LCP_OPT_MRU:
2532 /*
2533 * Should not be rejected anyway, since we only
2534 * negotiate a MRU if explicitly requested by
2535 * peer.
2536 */
2537 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2538 break;
2539 case LCP_OPT_AUTH_PROTO:
2540 /*
2541 * Peer doesn't want to authenticate himself,
2542 * deny unless this is a dialout call, and
2543 * AUTHFLAG_NOCALLOUT is set.
2544 */
2545 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2546 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2547 if (debug)
2548 addlog("[don't insist on auth "
2549 "for callout]");
2550 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2551 break;
2552 }
2553 if (debug)
2554 addlog("[access denied]\n");
2555 lcp.Close(sp);
2556 break;
2557 }
2558 }
2559 if (debug)
2560 addlog("\n");
2561 drop:
2562 free (buf, M_TEMP);
2563 return;
2564 }
2565
2566 /*
2567 * Analyze the LCP Configure-NAK option list, and adjust our
2568 * negotiation.
2569 */
2570 static void
2571 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2572 {
2573 STDDCL;
2574 u_char *buf, *p;
2575 u_long magic;
2576
2577 len -= 4;
2578 buf = malloc (len, M_TEMP, M_INTWAIT);
2579
2580 if (debug)
2581 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2582 SPP_ARGS(ifp));
2583
2584 p = (void*) (h+1);
2585 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2586 /* Sanity check option length */
2587 if (p[1] > len) {
2588 /*
2589 * Malicious option - drop immediately.
2590 * XXX Maybe we should just RXJ it?
2591 */
2592 addlog("%s: received malicious LCP option, "
2593 "dropping.\n", ifp->if_xname);
2594 goto drop;
2595 }
2596 if (debug)
2597 addlog(" %s ", sppp_lcp_opt_name(*p));
2598 switch (*p) {
2599 case LCP_OPT_MAGIC:
2600 /* Magic number -- renegotiate */
2601 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2602 len >= 6 && p[1] == 6) {
2603 magic = (u_long)p[2] << 24 |
2604 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2605 /*
2606 * If the remote magic is our negated one,
2607 * this looks like a loopback problem.
2608 * Suggest a new magic to make sure.
2609 */
2610 if (magic == ~sp->lcp.magic) {
2611 if (debug)
2612 addlog("magic glitch ");
2613 #if defined(__DragonFly__)
2614 sp->lcp.magic = random();
2615 #else
2616 sp->lcp.magic = time.tv_sec + time.tv_usec;
2617 #endif
2618 } else {
2619 sp->lcp.magic = magic;
2620 if (debug)
2621 addlog("%lu ", magic);
2622 }
2623 }
2624 break;
2625 case LCP_OPT_MRU:
2626 /*
2627 * Peer wants to advise us to negotiate an MRU.
2628 * Agree on it if it's reasonable, or use
2629 * default otherwise.
2630 */
2631 if (len >= 4 && p[1] == 4) {
2632 u_int mru = p[2] * 256 + p[3];
2633 if (debug)
2634 addlog("%d ", mru);
2635 if (mru < PP_MTU || mru > PP_MAX_MRU)
2636 mru = PP_MTU;
2637 sp->lcp.mru = mru;
2638 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2639 }
2640 break;
2641 case LCP_OPT_AUTH_PROTO:
2642 /*
2643 * Peer doesn't like our authentication method,
2644 * deny.
2645 */
2646 if (debug)
2647 addlog("[access denied]\n");
2648 lcp.Close(sp);
2649 break;
2650 }
2651 }
2652 if (debug)
2653 addlog("\n");
2654 drop:
2655 free (buf, M_TEMP);
2656 return;
2657 }
2658
2659 static void
2660 sppp_lcp_tlu(struct sppp *sp)
2661 {
2662 STDDCL;
2663 int i;
2664 u_long mask;
2665
2666 /* XXX ? */
2667 if (! (ifp->if_flags & IFF_UP) &&
2668 (ifp->if_flags & IFF_RUNNING)) {
2669 /* Coming out of loopback mode. */
2670 if_up(ifp);
2671 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2672 }
2673
2674 for (i = 0; i < IDX_COUNT; i++)
2675 if ((cps[i])->flags & CP_QUAL)
2676 (cps[i])->Open(sp);
2677
2678 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2679 (sp->pp_flags & PP_NEEDAUTH) != 0)
2680 sp->pp_phase = PHASE_AUTHENTICATE;
2681 else
2682 sp->pp_phase = PHASE_NETWORK;
2683
2684 if (debug)
2685 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2686 sppp_phase_name(sp->pp_phase));
2687
2688 /*
2689 * Open all authentication protocols. This is even required
2690 * if we already proceeded to network phase, since it might be
2691 * that remote wants us to authenticate, so we might have to
2692 * send a PAP request. Undesired authentication protocols
2693 * don't do anything when they get an Open event.
2694 */
2695 for (i = 0; i < IDX_COUNT; i++)
2696 if ((cps[i])->flags & CP_AUTH)
2697 (cps[i])->Open(sp);
2698
2699 if (sp->pp_phase == PHASE_NETWORK) {
2700 /* Notify all NCPs. */
2701 for (i = 0; i < IDX_COUNT; i++)
2702 if (((cps[i])->flags & CP_NCP) &&
2703 /*
2704 * XXX
2705 * Hack to administratively disable IPv6 if
2706 * not desired. Perhaps we should have another
2707 * flag for this, but right now, we can make
2708 * all struct cp's read/only.
2709 */
2710 (cps[i] != &ipv6cp ||
2711 (sp->confflags & CONF_ENABLE_IPV6)))
2712 (cps[i])->Open(sp);
2713 }
2714
2715 /* Send Up events to all started protos. */
2716 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2717 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2718 (cps[i])->Up(sp);
2719
2720 /* notify low-level driver of state change */
2721 if (sp->pp_chg)
2722 sp->pp_chg(sp, (int)sp->pp_phase);
2723
2724 if (sp->pp_phase == PHASE_NETWORK)
2725 /* if no NCP is starting, close down */
2726 sppp_lcp_check_and_close(sp);
2727 }
2728
2729 static void
2730 sppp_lcp_tld(struct sppp *sp)
2731 {
2732 STDDCL;
2733 int i;
2734 u_long mask;
2735
2736 sp->pp_phase = PHASE_TERMINATE;
2737
2738 if (debug)
2739 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2740 sppp_phase_name(sp->pp_phase));
2741
2742 /*
2743 * Take upper layers down. We send the Down event first and
2744 * the Close second to prevent the upper layers from sending
2745 * ``a flurry of terminate-request packets'', as the RFC
2746 * describes it.
2747 */
2748 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2749 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2750 (cps[i])->Down(sp);
2751 (cps[i])->Close(sp);
2752 }
2753 }
2754
2755 static void
2756 sppp_lcp_tls(struct sppp *sp)
2757 {
2758 STDDCL;
2759
2760 sp->pp_phase = PHASE_ESTABLISH;
2761
2762 if (debug)
2763 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2764 sppp_phase_name(sp->pp_phase));
2765
2766 /* Notify lower layer if desired. */
2767 if (sp->pp_tls)
2768 (sp->pp_tls)(sp);
2769 else
2770 (sp->pp_up)(sp);
2771 }
2772
2773 static void
2774 sppp_lcp_tlf(struct sppp *sp)
2775 {
2776 STDDCL;
2777
2778 sp->pp_phase = PHASE_DEAD;
2779 if (debug)
2780 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2781 sppp_phase_name(sp->pp_phase));
2782
2783 /* Notify lower layer if desired. */
2784 if (sp->pp_tlf)
2785 (sp->pp_tlf)(sp);
2786 else
2787 (sp->pp_down)(sp);
2788 }
2789
2790 static void
2791 sppp_lcp_scr(struct sppp *sp)
2792 {
2793 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2794 int i = 0;
2795 u_short authproto;
2796
2797 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2798 if (! sp->lcp.magic)
2799 #if defined(__DragonFly__)
2800 sp->lcp.magic = random();
2801 #else
2802 sp->lcp.magic = time.tv_sec + time.tv_usec;
2803 #endif
2804 opt[i++] = LCP_OPT_MAGIC;
2805 opt[i++] = 6;
2806 opt[i++] = sp->lcp.magic >> 24;
2807 opt[i++] = sp->lcp.magic >> 16;
2808 opt[i++] = sp->lcp.magic >> 8;
2809 opt[i++] = sp->lcp.magic;
2810 }
2811
2812 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2813 opt[i++] = LCP_OPT_MRU;
2814 opt[i++] = 4;
2815 opt[i++] = sp->lcp.mru >> 8;
2816 opt[i++] = sp->lcp.mru;
2817 }
2818
2819 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2820 authproto = sp->hisauth.proto;
2821 opt[i++] = LCP_OPT_AUTH_PROTO;
2822 opt[i++] = authproto == PPP_CHAP? 5: 4;
2823 opt[i++] = authproto >> 8;
2824 opt[i++] = authproto;
2825 if (authproto == PPP_CHAP)
2826 opt[i++] = CHAP_MD5;
2827 }
2828
2829 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2830 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2831 }
2832
2833 /*
2834 * Check the open NCPs, return true if at least one NCP is open.
2835 */
2836 static int
2837 sppp_ncp_check(struct sppp *sp)
2838 {
2839 int i, mask;
2840
2841 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2842 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2843 return 1;
2844 return 0;
2845 }
2846
2847 /*
2848 * Re-check the open NCPs and see if we should terminate the link.
2849 * Called by the NCPs during their tlf action handling.
2850 */
2851 static void
2852 sppp_lcp_check_and_close(struct sppp *sp)
2853 {
2854
2855 if (sp->pp_phase < PHASE_NETWORK)
2856 /* don't bother, we are already going down */
2857 return;
2858
2859 if (sppp_ncp_check(sp))
2860 return;
2861
2862 lcp.Close(sp);
2863 }
2864
2865 /*
2866 *--------------------------------------------------------------------------*
2867 * *
2868 * The IPCP implementation. *
2869 * *
2870 *--------------------------------------------------------------------------*
2871 */
2872
2873 static void
2874 sppp_ipcp_init(struct sppp *sp)
2875 {
2876 sp->ipcp.opts = 0;
2877 sp->ipcp.flags = 0;
2878 sp->state[IDX_IPCP] = STATE_INITIAL;
2879 sp->fail_counter[IDX_IPCP] = 0;
2880 sp->pp_seq[IDX_IPCP] = 0;
2881 sp->pp_rseq[IDX_IPCP] = 0;
2882 #if defined(__DragonFly__)
2883 callout_init(&sp->timeout[IDX_IPCP]);
2884 #endif
2885 }
2886
2887 static void
2888 sppp_ipcp_up(struct sppp *sp)
2889 {
2890 sppp_up_event(&ipcp, sp);
2891 }
2892
2893 static void
2894 sppp_ipcp_down(struct sppp *sp)
2895 {
2896 sppp_down_event(&ipcp, sp);
2897 }
2898
2899 static void
2900 sppp_ipcp_open(struct sppp *sp)
2901 {
2902 STDDCL;
2903 u_long myaddr, hisaddr;
2904
2905 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2906 IPCP_MYADDR_DYN | IPCP_VJ);
2907 sp->ipcp.opts = 0;
2908
2909 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2910 /*
2911 * If we don't have his address, this probably means our
2912 * interface doesn't want to talk IP at all. (This could
2913 * be the case if somebody wants to speak only IPX, for
2914 * example.) Don't open IPCP in this case.
2915 */
2916 if (hisaddr == 0L) {
2917 /* XXX this message should go away */
2918 if (debug)
2919 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2920 SPP_ARGS(ifp));
2921 return;
2922 }
2923 if (myaddr == 0L) {
2924 /*
2925 * I don't have an assigned address, so i need to
2926 * negotiate my address.
2927 */
2928 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2929 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2930 } else
2931 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2932 if (sp->confflags & CONF_ENABLE_VJ) {
2933 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2934 sp->ipcp.max_state = MAX_STATES - 1;
2935 sp->ipcp.compress_cid = 1;
2936 }
2937 sppp_open_event(&ipcp, sp);
2938 }
2939
2940 static void
2941 sppp_ipcp_close(struct sppp *sp)
2942 {
2943 sppp_close_event(&ipcp, sp);
2944 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2945 /*
2946 * My address was dynamic, clear it again.
2947 */
2948 sppp_set_ip_addr(sp, 0L);
2949 }
2950
2951 static void
2952 sppp_ipcp_TO(void *cookie)
2953 {
2954 sppp_to_event(&ipcp, (struct sppp *)cookie);
2955 }
2956
2957 /*
2958 * Analyze a configure request. Return true if it was agreeable, and
2959 * caused action sca, false if it has been rejected or nak'ed, and
2960 * caused action scn. (The return value is used to make the state
2961 * transition decision in the state automaton.)
2962 */
2963 static int
2964 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2965 {
2966 u_char *buf, *r, *p;
2967 struct ifnet *ifp = &sp->pp_if;
2968 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2969 u_long hisaddr, desiredaddr;
2970 int gotmyaddr = 0;
2971 int desiredcomp;
2972
2973 len -= 4;
2974 origlen = len;
2975 /*
2976 * Make sure to allocate a buf that can at least hold a
2977 * conf-nak with an `address' option. We might need it below.
2978 */
2979 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2980
2981 /* pass 1: see if we can recognize them */
2982 if (debug)
2983 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2984 SPP_ARGS(ifp));
2985 p = (void*) (h+1);
2986 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2987 /* Sanity check option length */
2988 if (p[1] > len) {
2989 /* XXX should we just RXJ? */
2990 addlog("%s: malicious IPCP option received, dropping\n",
2991 ifp->if_xname);
2992 goto drop;
2993 }
2994 if (debug)
2995 addlog(" %s ", sppp_ipcp_opt_name(*p));
2996 switch (*p) {
2997 case IPCP_OPT_COMPRESSION:
2998 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2999 /* VJ compression administratively disabled */
3000 if (debug)
3001 addlog("[locally disabled] ");
3002 break;
3003 }
3004 /*
3005 * In theory, we should only conf-rej an
3006 * option that is shorter than RFC 1618
3007 * requires (i.e. < 4), and should conf-nak
3008 * anything else that is not VJ. However,
3009 * since our algorithm always uses the
3010 * original option to NAK it with new values,
3011 * things would become more complicated. In
3012 * pratice, the only commonly implemented IP
3013 * compression option is VJ anyway, so the
3014 * difference is negligible.
3015 */
3016 if (len >= 6 && p[1] == 6) {
3017 /*
3018 * correctly formed compression option
3019 * that could be VJ compression
3020 */
3021 continue;
3022 }
3023 if (debug)
3024 addlog("optlen %d [invalid/unsupported] ",
3025 p[1]);
3026 break;
3027 case IPCP_OPT_ADDRESS:
3028 if (len >= 6 && p[1] == 6) {
3029 /* correctly formed address option */
3030 continue;
3031 }
3032 if (debug)
3033 addlog("[invalid] ");
3034 break;
3035 default:
3036 /* Others not supported. */
3037 if (debug)
3038 addlog("[rej] ");
3039 break;
3040 }
3041 /* Add the option to rejected list. */
3042 bcopy (p, r, p[1]);
3043 r += p[1];
3044 rlen += p[1];
3045 }
3046 if (rlen) {
3047 if (debug)
3048 addlog(" send conf-rej\n");
3049 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3050 return 0;
3051 } else if (debug)
3052 addlog("\n");
3053
3054 /* pass 2: parse option values */
3055 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3056 if (debug)
3057 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3058 SPP_ARGS(ifp));
3059 p = (void*) (h+1);
3060 len = origlen;
3061 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3062 if (debug)
3063 addlog(" %s ", sppp_ipcp_opt_name(*p));
3064 switch (*p) {
3065 case IPCP_OPT_COMPRESSION:
3066 desiredcomp = p[2] << 8 | p[3];
3067 /* We only support VJ */
3068 if (desiredcomp == IPCP_COMP_VJ) {
3069 if (debug)
3070 addlog("VJ [ack] ");
3071 sp->ipcp.flags |= IPCP_VJ;
3072 sl_compress_init(sp->pp_comp, p[4]);
3073 sp->ipcp.max_state = p[4];
3074 sp->ipcp.compress_cid = p[5];
3075 continue;
3076 }
3077 if (debug)
3078 addlog("compproto %#04x [not supported] ",
3079 desiredcomp);
3080 p[2] = IPCP_COMP_VJ >> 8;
3081 p[3] = IPCP_COMP_VJ;
3082 p[4] = sp->ipcp.max_state;
3083 p[5] = sp->ipcp.compress_cid;
3084 break;
3085 case IPCP_OPT_ADDRESS:
3086 /* This is the address he wants in his end */
3087 desiredaddr = p[2] << 24 | p[3] << 16 |
3088 p[4] << 8 | p[5];
3089 if (desiredaddr == hisaddr ||
3090 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3091 /*
3092 * Peer's address is same as our value,
3093 * or we have set it to 0.0.0.* to
3094 * indicate that we do not really care,
3095 * this is agreeable. Gonna conf-ack
3096 * it.
3097 */
3098 if (debug)
3099 addlog("%s [ack] ",
3100 sppp_dotted_quad(hisaddr));
3101 /* record that we've seen it already */
3102 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3103 continue;
3104 }
3105 /*
3106 * The address wasn't agreeable. This is either
3107 * he sent us 0.0.0.0, asking to assign him an
3108 * address, or he send us another address not
3109 * matching our value. Either case, we gonna
3110 * conf-nak it with our value.
3111 * XXX: we should "rej" if hisaddr == 0
3112 */
3113 if (debug) {
3114 if (desiredaddr == 0)
3115 addlog("[addr requested] ");
3116 else
3117 addlog("%s [not agreed] ",
3118 sppp_dotted_quad(desiredaddr));
3119
3120 }
3121 p[2] = hisaddr >> 24;
3122 p[3] = hisaddr >> 16;
3123 p[4] = hisaddr >> 8;
3124 p[5] = hisaddr;
3125 break;
3126 }
3127 /* Add the option to nak'ed list. */
3128 bcopy (p, r, p[1]);
3129 r += p[1];
3130 rlen += p[1];
3131 }
3132
3133 /*
3134 * If we are about to conf-ack the request, but haven't seen
3135 * his address so far, gonna conf-nak it instead, with the
3136 * `address' option present and our idea of his address being
3137 * filled in there, to request negotiation of both addresses.
3138 *
3139 * XXX This can result in an endless req - nak loop if peer
3140 * doesn't want to send us his address. Q: What should we do
3141 * about it? XXX A: implement the max-failure counter.
3142 */
3143 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3144 buf[0] = IPCP_OPT_ADDRESS;
3145 buf[1] = 6;
3146 buf[2] = hisaddr >> 24;
3147 buf[3] = hisaddr >> 16;
3148 buf[4] = hisaddr >> 8;
3149 buf[5] = hisaddr;
3150 rlen = 6;
3151 if (debug)
3152 addlog("still need hisaddr ");
3153 }
3154
3155 if (rlen) {
3156 if (debug)
3157 addlog(" send conf-nak\n");
3158 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3159 } else {
3160 if (debug)
3161 addlog(" send conf-ack\n");
3162 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3163 h->ident, origlen, h+1);
3164 }
3165
3166 free (buf, M_TEMP);
3167 return (rlen == 0);
3168
3169 drop:
3170 free(buf, M_TEMP);
3171 return (-1);
3172 }
3173
3174 /*
3175 * Analyze the IPCP Configure-Reject option list, and adjust our
3176 * negotiation.
3177 */
3178 static void
3179 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3180 {
3181 u_char *buf, *p;
3182 struct ifnet *ifp = &sp->pp_if;
3183 int debug = ifp->if_flags & IFF_DEBUG;
3184
3185 len -= 4;
3186 buf = malloc (len, M_TEMP, M_INTWAIT);
3187
3188 if (debug)
3189 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3190 SPP_ARGS(ifp));
3191
3192 p = (void*) (h+1);
3193 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3194 /* Sanity check option length */
3195 if (p[1] > len) {
3196 /* XXX should we just RXJ? */
3197 addlog("%s: malicious IPCP option received, dropping\n",
3198 ifp->if_xname);
3199 goto drop;
3200 }
3201 if (debug)
3202 addlog(" %s ", sppp_ipcp_opt_name(*p));
3203 switch (*p) {
3204 case IPCP_OPT_COMPRESSION:
3205 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3206 break;
3207 case IPCP_OPT_ADDRESS:
3208 /*
3209 * Peer doesn't grok address option. This is
3210 * bad. XXX Should we better give up here?
3211 * XXX We could try old "addresses" option...
3212 */
3213 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3214 break;
3215 }
3216 }
3217 if (debug)
3218 addlog("\n");
3219 drop:
3220 free (buf, M_TEMP);
3221 return;
3222 }
3223
3224 /*
3225 * Analyze the IPCP Configure-NAK option list, and adjust our
3226 * negotiation.
3227 */
3228 static void
3229 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3230 {
3231 u_char *buf, *p;
3232 struct ifnet *ifp = &sp->pp_if;
3233 int debug = ifp->if_flags & IFF_DEBUG;
3234 int desiredcomp;
3235 u_long wantaddr;
3236
3237 len -= 4;
3238 buf = malloc (len, M_TEMP, M_INTWAIT);
3239
3240 if (debug)
3241 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3242 SPP_ARGS(ifp));
3243
3244 p = (void*) (h+1);
3245 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3246 /* Sanity check option length */
3247 if (p[1] > len) {
3248 /* XXX should we just RXJ? */
3249 addlog("%s: malicious IPCP option received, dropping\n",
3250 ifp->if_xname);
3251 return;
3252 }
3253 if (debug)
3254 addlog(" %s ", sppp_ipcp_opt_name(*p));
3255 switch (*p) {
3256 case IPCP_OPT_COMPRESSION:
3257 if (len >= 6 && p[1] == 6) {
3258 desiredcomp = p[2] << 8 | p[3];
3259 if (debug)
3260 addlog("[wantcomp %#04x] ",
3261 desiredcomp);
3262 if (desiredcomp == IPCP_COMP_VJ) {
3263 sl_compress_init(sp->pp_comp, p[4]);
3264 sp->ipcp.max_state = p[4];
3265 sp->ipcp.compress_cid = p[5];
3266 if (debug)
3267 addlog("[agree] ");
3268 } else
3269 sp->ipcp.opts &=
3270 ~(1 << IPCP_OPT_COMPRESSION);
3271 }
3272 break;
3273 case IPCP_OPT_ADDRESS:
3274 /*
3275 * Peer doesn't like our local IP address. See
3276 * if we can do something for him. We'll drop
3277 * him our address then.
3278 */
3279 if (len >= 6 && p[1] == 6) {
3280 wantaddr = p[2] << 24 | p[3] << 16 |
3281 p[4] << 8 | p[5];
3282 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3283 if (debug)
3284 addlog("[wantaddr %s] ",
3285 sppp_dotted_quad(wantaddr));
3286 /*
3287 * When doing dynamic address assignment,
3288 * we accept his offer. Otherwise, we
3289 * ignore it and thus continue to negotiate
3290 * our already existing value.
3291 * XXX: Bogus, if he said no once, he'll
3292 * just say no again, might as well die.
3293 */
3294 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3295 sppp_set_ip_addr(sp, wantaddr);
3296 if (debug)
3297 addlog("[agree] ");
3298 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3299 }
3300 }
3301 break;
3302 }
3303 }
3304 if (debug)
3305 addlog("\n");
3306 free (buf, M_TEMP);
3307 return;
3308 }
3309
3310 static void
3311 sppp_ipcp_tlu(struct sppp *sp)
3312 {
3313 /* we are up - notify isdn daemon */
3314 if (sp->pp_con)
3315 sp->pp_con(sp);
3316 }
3317
3318 static void
3319 sppp_ipcp_tld(struct sppp *sp)
3320 {
3321 }
3322
3323 static void
3324 sppp_ipcp_tls(struct sppp *sp)
3325 {
3326 /* indicate to LCP that it must stay alive */
3327 sp->lcp.protos |= (1 << IDX_IPCP);
3328 }
3329
3330 static void
3331 sppp_ipcp_tlf(struct sppp *sp)
3332 {
3333 /* we no longer need LCP */
3334 sp->lcp.protos &= ~(1 << IDX_IPCP);
3335 sppp_lcp_check_and_close(sp);
3336 }
3337
3338 static void
3339 sppp_ipcp_scr(struct sppp *sp)
3340 {
3341 char opt[6 /* compression */ + 6 /* address */];
3342 u_long ouraddr;
3343 int i = 0;
3344
3345 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3346 opt[i++] = IPCP_OPT_COMPRESSION;
3347 opt[i++] = 6;
3348 opt[i++] = IPCP_COMP_VJ >> 8;
3349 opt[i++] = IPCP_COMP_VJ;
3350 opt[i++] = sp->ipcp.max_state;
3351 opt[i++] = sp->ipcp.compress_cid;
3352 }
3353 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3354 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3355 opt[i++] = IPCP_OPT_ADDRESS;
3356 opt[i++] = 6;
3357 opt[i++] = ouraddr >> 24;
3358 opt[i++] = ouraddr >> 16;
3359 opt[i++] = ouraddr >> 8;
3360 opt[i++] = ouraddr;
3361 }
3362
3363 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3364 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3365 }
3366
3367 /*
3368 *--------------------------------------------------------------------------*
3369 * *
3370 * The IPv6CP implementation. *
3371 * *
3372 *--------------------------------------------------------------------------*
3373 */
3374
3375 #ifdef INET6
3376 static void
3377 sppp_ipv6cp_init(struct sppp *sp)
3378 {
3379 sp->ipv6cp.opts = 0;
3380 sp->ipv6cp.flags = 0;
3381 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3382 sp->fail_counter[IDX_IPV6CP] = 0;
3383 sp->pp_seq[IDX_IPV6CP] = 0;
3384 sp->pp_rseq[IDX_IPV6CP] = 0;
3385 #if defined(__NetBSD__)
3386 callout_init(&sp->ch[IDX_IPV6CP]);
3387 #endif
3388 #if defined(__DragonFly__)
3389 callout_init(&sp->timeout[IDX_IPV6CP]);
3390 #endif
3391 }
3392
3393 static void
3394 sppp_ipv6cp_up(struct sppp *sp)
3395 {
3396 sppp_up_event(&ipv6cp, sp);
3397 }
3398
3399 static void
3400 sppp_ipv6cp_down(struct sppp *sp)
3401 {
3402 sppp_down_event(&ipv6cp, sp);
3403 }
3404
3405 static void
3406 sppp_ipv6cp_open(struct sppp *sp)
3407 {
3408 STDDCL;
3409 struct in6_addr myaddr, hisaddr;
3410
3411 #ifdef IPV6CP_MYIFID_DYN
3412 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3413 #else
3414 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3415 #endif
3416
3417 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3418 /*
3419 * If we don't have our address, this probably means our
3420 * interface doesn't want to talk IPv6 at all. (This could
3421 * be the case if somebody wants to speak only IPX, for
3422 * example.) Don't open IPv6CP in this case.
3423 */
3424 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3425 /* XXX this message should go away */
3426 if (debug)
3427 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3428 SPP_ARGS(ifp));
3429 return;
3430 }
3431
3432 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3433 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3434 sppp_open_event(&ipv6cp, sp);
3435 }
3436
3437 static void
3438 sppp_ipv6cp_close(struct sppp *sp)
3439 {
3440 sppp_close_event(&ipv6cp, sp);
3441 }
3442
3443 static void
3444 sppp_ipv6cp_TO(void *cookie)
3445 {
3446 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3447 }
3448
3449 /*
3450 * Analyze a configure request. Return true if it was agreeable, and
3451 * caused action sca, false if it has been rejected or nak'ed, and
3452 * caused action scn. (The return value is used to make the state
3453 * transition decision in the state automaton.)
3454 */
3455 static int
3456 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3457 {
3458 u_char *buf, *r, *p;
3459 struct ifnet *ifp = &sp->pp_if;
3460 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3461 struct in6_addr myaddr, desiredaddr, suggestaddr;
3462 int ifidcount;
3463 int type;
3464 int collision, nohisaddr;
3465
3466 len -= 4;
3467 origlen = len;
3468 /*
3469 * Make sure to allocate a buf that can at least hold a
3470 * conf-nak with an `address' option. We might need it below.
3471 */
3472 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3473
3474 /* pass 1: see if we can recognize them */
3475 if (debug)
3476 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3477 SPP_ARGS(ifp));
3478 p = (void*) (h+1);
3479 ifidcount = 0;
3480 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3481 /* Sanity check option length */
3482 if (p[1] > len) {
3483 /* XXX just RXJ? */
3484 addlog("%s: received malicious IPCPv6 option, "
3485 "dropping\n", ifp->if_xname);
3486 goto drop;
3487 }
3488 if (debug)
3489 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3490 switch (*p) {
3491 case IPV6CP_OPT_IFID:
3492 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3493 /* correctly formed address option */
3494 ifidcount++;
3495 continue;
3496 }
3497 if (debug)
3498 addlog(" [invalid]");
3499 break;
3500 #ifdef notyet
3501 case IPV6CP_OPT_COMPRESSION:
3502 if (len >= 4 && p[1] >= 4) {
3503 /* correctly formed compress option */
3504 continue;
3505 }
3506 if (debug)
3507 addlog(" [invalid]");
3508 break;
3509 #endif
3510 default:
3511 /* Others not supported. */
3512 if (debug)
3513 addlog(" [rej]");
3514 break;
3515 }
3516 /* Add the option to rejected list. */
3517 bcopy (p, r, p[1]);
3518 r += p[1];
3519 rlen += p[1];
3520 }
3521 if (rlen) {
3522 if (debug)
3523 addlog(" send conf-rej\n");
3524 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3525 goto end;
3526 } else if (debug)
3527 addlog("\n");
3528
3529 /* pass 2: parse option values */
3530 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3531 if (debug)
3532 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3533 SPP_ARGS(ifp));
3534 p = (void*) (h+1);
3535 len = origlen;
3536 type = CONF_ACK;
3537 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3538 if (debug)
3539 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3540 switch (*p) {
3541 #ifdef notyet
3542 case IPV6CP_OPT_COMPRESSION:
3543 continue;
3544 #endif
3545 case IPV6CP_OPT_IFID:
3546 bzero(&desiredaddr, sizeof(desiredaddr));
3547 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3548 collision = (bcmp(&desiredaddr.s6_addr[8],
3549 &myaddr.s6_addr[8], 8) == 0);
3550 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3551
3552 desiredaddr.s6_addr16[0] = htons(0xfe80);
3553 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3554
3555 if (!collision && !nohisaddr) {
3556 /* no collision, hisaddr known - Conf-Ack */
3557 type = CONF_ACK;
3558
3559 if (debug) {
3560 addlog(" %s [%s]",
3561 ip6_sprintf(&desiredaddr),
3562 sppp_cp_type_name(type));
3563 }
3564 continue;
3565 }
3566
3567 bzero(&suggestaddr, sizeof(&suggestaddr));
3568 if (collision && nohisaddr) {
3569 /* collision, hisaddr unknown - Conf-Rej */
3570 type = CONF_REJ;
3571 bzero(&p[2], 8);
3572 } else {
3573 /*
3574 * - no collision, hisaddr unknown, or
3575 * - collision, hisaddr known
3576 * Conf-Nak, suggest hisaddr
3577 */
3578 type = CONF_NAK;
3579 sppp_suggest_ip6_addr(sp, &suggestaddr);
3580 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3581 }
3582 if (debug)
3583 addlog(" %s [%s]", ip6_sprintf(&desiredaddr),
3584 sppp_cp_type_name(type));
3585 break;
3586 }
3587 /* Add the option to nak'ed list. */
3588 bcopy (p, r, p[1]);
3589 r += p[1];
3590 rlen += p[1];
3591 }
3592
3593 if (rlen == 0 && type == CONF_ACK) {
3594 if (debug)
3595 addlog(" send %s\n", sppp_cp_type_name(type));
3596 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3597 } else {
3598 #ifdef DIAGNOSTIC
3599 if (type == CONF_ACK)
3600 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3601 #endif
3602
3603 if (debug) {
3604 addlog(" send %s suggest %s\n",
3605 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3606 }
3607 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3608 }
3609
3610 end:
3611 free (buf, M_TEMP);
3612 return (rlen == 0);
3613
3614 drop:
3615 free(buf, M_TEMP);
3616 return (-1);
3617 }
3618
3619 /*
3620 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3621 * negotiation.
3622 */
3623 static void
3624 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3625 {
3626 u_char *buf, *p;
3627 struct ifnet *ifp = &sp->pp_if;
3628 int debug = ifp->if_flags & IFF_DEBUG;
3629
3630 len -= 4;
3631 buf = malloc (len, M_TEMP, M_INTWAIT);
3632
3633 if (debug)
3634 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3635 SPP_ARGS(ifp));
3636
3637 p = (void*) (h+1);
3638 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3639 if (p[1] > len) {
3640 /* XXX just RXJ? */
3641 addlog("%s: received malicious IPCPv6 option, "
3642 "dropping\n", ifp->if_xname);
3643 goto drop;
3644 }
3645 if (debug)
3646 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3647 switch (*p) {
3648 case IPV6CP_OPT_IFID:
3649 /*
3650 * Peer doesn't grok address option. This is
3651 * bad. XXX Should we better give up here?
3652 */
3653 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3654 break;
3655 #ifdef notyet
3656 case IPV6CP_OPT_COMPRESS:
3657 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3658 break;
3659 #endif
3660 }
3661 }
3662 if (debug)
3663 addlog("\n");
3664 drop:
3665 free (buf, M_TEMP);
3666 return;
3667 }
3668
3669 /*
3670 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3671 * negotiation.
3672 */
3673 static void
3674 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3675 {
3676 u_char *buf, *p;
3677 struct ifnet *ifp = &sp->pp_if;
3678 int debug = ifp->if_flags & IFF_DEBUG;
3679 struct in6_addr suggestaddr;
3680
3681 len -= 4;
3682 buf = malloc (len, M_TEMP, M_INTWAIT);
3683
3684 if (debug)
3685 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3686 SPP_ARGS(ifp));
3687
3688 p = (void*) (h+1);
3689 for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3690 if (p[1] > len) {
3691 /* XXX just RXJ? */
3692 addlog("%s: received malicious IPCPv6 option, "
3693 "dropping\n", ifp->if_xname);
3694 goto drop;
3695 }
3696 if (debug)
3697 addlog(" %s", sppp_ipv6cp_opt_name(*p));
3698 switch (*p) {
3699 case IPV6CP_OPT_IFID:
3700 /*
3701 * Peer doesn't like our local ifid. See
3702 * if we can do something for him. We'll drop
3703 * him our address then.
3704 */
3705 if (len < 10 || p[1] != 10)
3706 break;
3707 bzero(&suggestaddr, sizeof(suggestaddr));
3708 suggestaddr.s6_addr16[0] = htons(0xfe80);
3709 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3710 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3711
3712 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3713 if (debug)
3714 addlog(" [suggestaddr %s]",
3715 ip6_sprintf(&suggestaddr));
3716 #ifdef IPV6CP_MYIFID_DYN
3717 /*
3718 * When doing dynamic address assignment,
3719 * we accept his offer.
3720 */
3721 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3722 struct in6_addr lastsuggest;
3723 /*
3724 * If <suggested myaddr from peer> equals to
3725 * <hisaddr we have suggested last time>,
3726 * we have a collision. generate new random
3727 * ifid.
3728 */
3729 sppp_suggest_ip6_addr(&lastsuggest);
3730 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3731 lastsuggest)) {
3732 if (debug)
3733 addlog(" [random]");
3734 sppp_gen_ip6_addr(sp, &suggestaddr);
3735 }
3736 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3737 if (debug)
3738 addlog(" [agree]");
3739 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3740 }
3741 #else
3742 /*
3743 * Since we do not do dynamic address assignment,
3744 * we ignore it and thus continue to negotiate
3745 * our already existing value. This can possibly
3746 * go into infinite request-reject loop.
3747 *
3748 * This is not likely because we normally use
3749 * ifid based on MAC-address.
3750 * If you have no ethernet card on the node, too bad.
3751 * XXX should we use fail_counter?
3752 */
3753 #endif
3754 break;
3755 #ifdef notyet
3756 case IPV6CP_OPT_COMPRESS:
3757 /*
3758 * Peer wants different compression parameters.
3759 */
3760 break;
3761 #endif
3762 }
3763 }
3764 if (debug)
3765 addlog("\n");
3766 drop:
3767 free (buf, M_TEMP);
3768 return;
3769 }
3770 static void
3771 sppp_ipv6cp_tlu(struct sppp *sp)
3772 {
3773 /* we are up - notify isdn daemon */
3774 if (sp->pp_con)
3775 sp->pp_con(sp);
3776 }
3777
3778 static void
3779 sppp_ipv6cp_tld(struct sppp *sp)
3780 {
3781 }
3782
3783 static void
3784 sppp_ipv6cp_tls(struct sppp *sp)
3785 {
3786 /* indicate to LCP that it must stay alive */
3787 sp->lcp.protos |= (1 << IDX_IPV6CP);
3788 }
3789
3790 static void
3791 sppp_ipv6cp_tlf(struct sppp *sp)
3792 {
3793
3794 #if 0 /* need #if 0 to close IPv6CP properly */
3795 /* we no longer need LCP */
3796 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3797 sppp_lcp_check_and_close(sp);
3798 #endif
3799 }
3800
3801 static void
3802 sppp_ipv6cp_scr(struct sppp *sp)
3803 {
3804 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3805 struct in6_addr ouraddr;
3806 int i = 0;
3807
3808 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3809 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3810 opt[i++] = IPV6CP_OPT_IFID;
3811 opt[i++] = 10;
3812 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3813 i += 8;
3814 }
3815
3816 #ifdef notyet
3817 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3818 opt[i++] = IPV6CP_OPT_COMPRESSION;
3819 opt[i++] = 4;
3820 opt[i++] = 0; /* TBD */
3821 opt[i++] = 0; /* TBD */
3822 /* variable length data may follow */
3823 }
3824 #endif
3825
3826 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3827 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3828 }
3829 #else /*INET6*/
3830 static void
3831 sppp_ipv6cp_init(struct sppp *sp)
3832 {
3833 }
3834
3835 static void
3836 sppp_ipv6cp_up(struct sppp *sp)
3837 {
3838 }
3839
3840 static void
3841 sppp_ipv6cp_down(struct sppp *sp)
3842 {
3843 }
3844
3845
3846 static void
3847 sppp_ipv6cp_open(struct sppp *sp)
3848 {
3849 }
3850
3851 static void
3852 sppp_ipv6cp_close(struct sppp *sp)
3853 {
3854 }
3855
3856 static void
3857 sppp_ipv6cp_TO(void *sp)
3858 {
3859 }
3860
3861 static int
3862 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3863 {
3864 return 0;
3865 }
3866
3867 static void
3868 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3869 {
3870 }
3871
3872 static void
3873 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3874 {
3875 }
3876
3877 static void
3878 sppp_ipv6cp_tlu(struct sppp *sp)
3879 {
3880 }
3881
3882 static void
3883 sppp_ipv6cp_tld(struct sppp *sp)
3884 {
3885 }
3886
3887 static void
3888 sppp_ipv6cp_tls(struct sppp *sp)
3889 {
3890 }
3891
3892 static void
3893 sppp_ipv6cp_tlf(struct sppp *sp)
3894 {
3895 }
3896
3897 static void
3898 sppp_ipv6cp_scr(struct sppp *sp)
3899 {
3900 }
3901 #endif /*INET6*/
3902
3903 /*
3904 *--------------------------------------------------------------------------*
3905 * *
3906 * The CHAP implementation. *
3907 * *
3908 *--------------------------------------------------------------------------*
3909 */
3910
3911 /*
3912 * The authentication protocols don't employ a full-fledged state machine as
3913 * the control protocols do, since they do have Open and Close events, but
3914 * not Up and Down, nor are they explicitly terminated. Also, use of the
3915 * authentication protocols may be different in both directions (this makes
3916 * sense, think of a machine that never accepts incoming calls but only
3917 * calls out, it doesn't require the called party to authenticate itself).
3918 *
3919 * Our state machine for the local authentication protocol (we are requesting
3920 * the peer to authenticate) looks like:
3921 *
3922 * RCA-
3923 * +--------------------------------------------+
3924 * V scn,tld|
3925 * +--------+ Close +---------+ RCA+
3926 * | |<----------------------------------| |------+
3927 * +--->| Closed | TO* | Opened | sca |
3928 * | | |-----+ +-------| |<-----+
3929 * | +--------+ irc | | +---------+
3930 * | ^ | | ^
3931 * | | | | |
3932 * | | | | |
3933 * | TO-| | | |
3934 * | |tld TO+ V | |
3935 * | | +------->+ | |
3936 * | | | | | |
3937 * | +--------+ V | |
3938 * | | |<----+<--------------------+ |
3939 * | | Req- | scr |
3940 * | | Sent | |
3941 * | | | |
3942 * | +--------+ |
3943 * | RCA- | | RCA+ |
3944 * +------+ +------------------------------------------+
3945 * scn,tld sca,irc,ict,tlu
3946 *
3947 *
3948 * with:
3949 *
3950 * Open: LCP reached authentication phase
3951 * Close: LCP reached terminate phase
3952 *
3953 * RCA+: received reply (pap-req, chap-response), acceptable
3954 * RCN: received reply (pap-req, chap-response), not acceptable
3955 * TO+: timeout with restart counter >= 0
3956 * TO-: timeout with restart counter < 0
3957 * TO*: reschedule timeout for CHAP
3958 *
3959 * scr: send request packet (none for PAP, chap-challenge)
3960 * sca: send ack packet (pap-ack, chap-success)
3961 * scn: send nak packet (pap-nak, chap-failure)
3962 * ict: initialize re-challenge timer (CHAP only)
3963 *
3964 * tlu: this-layer-up, LCP reaches network phase
3965 * tld: this-layer-down, LCP enters terminate phase
3966 *
3967 * Note that in CHAP mode, after sending a new challenge, while the state
3968 * automaton falls back into Req-Sent state, it doesn't signal a tld
3969 * event to LCP, so LCP remains in network phase. Only after not getting
3970 * any response (or after getting an unacceptable response), CHAP closes,
3971 * causing LCP to enter terminate phase.
3972 *
3973 * With PAP, there is no initial request that can be sent. The peer is
3974 * expected to send one based on the successful negotiation of PAP as
3975 * the authentication protocol during the LCP option negotiation.
3976 *
3977 * Incoming authentication protocol requests (remote requests
3978 * authentication, we are peer) don't employ a state machine at all,
3979 * they are simply answered. Some peers [Ascend P50 firmware rev
3980 * 4.50] react allergically when sending IPCP requests while they are
3981 * still in authentication phase (thereby violating the standard that
3982 * demands that these NCP packets are to be discarded), so we keep
3983 * track of the peer demanding us to authenticate, and only proceed to
3984 * phase network once we've seen a positive acknowledge for the
3985 * authentication.
3986 */
3987
3988 /*
3989 * Handle incoming CHAP packets.
3990 */
3991 void
3992 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3993 {
3994 STDDCL;
3995 struct lcp_header *h;
3996 int len;
3997 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3998 int value_len, name_len;
3999 MD5_CTX ctx;
4000
4001 len = m->m_pkthdr.len;
4002 if (len < 4) {
4003 if (debug)
4004 log(LOG_DEBUG,
4005 SPP_FMT "chap invalid packet length: %d bytes\n",
4006 SPP_ARGS(ifp), len);
4007 return;
4008 }
4009 h = mtod (m, struct lcp_header*);
4010 if (len > ntohs (h->len))
4011 len = ntohs (h->len);
4012
4013 switch (h->type) {
4014 /* challenge, failure and success are his authproto */
4015 case CHAP_CHALLENGE:
4016 value = 1 + (u_char*)(h+1);
4017 value_len = value[-1];
4018 name = value + value_len;
4019 name_len = len - value_len - 5;
4020 if (name_len < 0) {
4021 if (debug) {
4022 log(LOG_DEBUG,
4023 SPP_FMT "chap corrupted challenge "
4024 "<%s id=0x%x len=%d",
4025 SPP_ARGS(ifp),
4026 sppp_auth_type_name(PPP_CHAP, h->type),
4027 h->ident, ntohs(h->len));
4028 sppp_print_bytes((u_char*) (h+1), len-4);
4029 addlog(">\n");
4030 }
4031 break;
4032 }
4033
4034 if (debug) {
4035 log(LOG_DEBUG,
4036 SPP_FMT "chap input <%s id=0x%x len=%d name=",
4037 SPP_ARGS(ifp),
4038 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4039 ntohs(h->len));
4040 sppp_print_string((char*) name, name_len);
4041 addlog(" value-size=%d value=", value_len);
4042 sppp_print_bytes(value, value_len);
4043 addlog(">\n");
4044 }
4045
4046 /* Compute reply value. */
4047 MD5Init(&ctx);
4048 MD5Update(&ctx, &h->ident, 1);
4049 MD5Update(&ctx, sp->myauth.secret,
4050 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4051 MD5Update(&ctx, value, value_len);
4052 MD5Final(digest, &ctx);
4053 dsize = sizeof digest;
4054
4055 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4056 sizeof dsize, (const char *)&dsize,
4057 sizeof digest, digest,
4058 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4059 sp->myauth.name,
4060 0);
4061 break;
4062
4063 case CHAP_SUCCESS:
4064 if (debug) {
4065 log(LOG_DEBUG, SPP_FMT "chap success",
4066 SPP_ARGS(ifp));
4067 if (len > 4) {
4068 addlog(": ");
4069 sppp_print_string((char*)(h + 1), len - 4);
4070 }
4071 addlog("\n");
4072 }
4073
4074 crit_enter();
4075
4076 sp->pp_flags &= ~PP_NEEDAUTH;
4077 if (sp->myauth.proto == PPP_CHAP &&
4078 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4079 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4080 /*
4081 * We are authenticator for CHAP but didn't
4082 * complete yet. Leave it to tlu to proceed
4083 * to network phase.
4084 */
4085 crit_exit();
4086 break;
4087 }
4088 crit_exit();
4089 sppp_phase_network(sp);
4090 break;
4091
4092 case CHAP_FAILURE:
4093 if (debug) {
4094 log(LOG_INFO, SPP_FMT "chap failure",
4095 SPP_ARGS(ifp));
4096 if (len > 4) {
4097 addlog(": ");
4098 sppp_print_string((char*)(h + 1), len - 4);
4099 }
4100 addlog("\n");
4101 } else
4102 log(LOG_INFO, SPP_FMT "chap failure\n",
4103 SPP_ARGS(ifp));
4104 /* await LCP shutdown by authenticator */
4105 break;
4106
4107 /* response is my authproto */
4108 case CHAP_RESPONSE:
4109 value = 1 + (u_char*)(h+1);
4110 value_len = value[-1];
4111 name = value + value_len;
4112 name_len = len - value_len - 5;
4113 if (name_len < 0) {
4114 if (debug) {
4115 log(LOG_DEBUG,
4116 SPP_FMT "chap corrupted response "
4117 "<%s id=0x%x len=%d",
4118 SPP_ARGS(ifp),
4119 sppp_auth_type_name(PPP_CHAP, h->type),
4120 h->ident, ntohs(h->len));
4121 sppp_print_bytes((u_char*)(h+1), len-4);
4122 addlog(">\n");
4123 }
4124 break;
4125 }
4126 if (h->ident != sp->confid[IDX_CHAP]) {
4127 if (debug)
4128 log(LOG_DEBUG,
4129 SPP_FMT "chap dropping response for old ID "
4130 "(got %d, expected %d)\n",
4131 SPP_ARGS(ifp),
4132 h->ident, sp->confid[IDX_CHAP]);
4133 break;
4134 }
4135 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4136 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4137 log(LOG_INFO, SPP_FMT "chap response, his name ",
4138 SPP_ARGS(ifp));
4139 sppp_print_string(name, name_len);
4140 addlog(" != expected ");
4141 sppp_print_string(sp->hisauth.name,
4142 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4143 addlog("\n");
4144 }
4145 if (debug) {
4146 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4147 "<%s id=0x%x len=%d name=",
4148 SPP_ARGS(ifp),
4149 sppp_state_name(sp->state[IDX_CHAP]),
4150 sppp_auth_type_name(PPP_CHAP, h->type),
4151 h->ident, ntohs (h->len));
4152 sppp_print_string((char*)name, name_len);
4153 addlog(" value-size=%d value=", value_len);
4154 sppp_print_bytes(value, value_len);
4155 addlog(">\n");
4156 }
4157 if (value_len != AUTHKEYLEN) {
4158 if (debug)
4159 log(LOG_DEBUG,
4160 SPP_FMT "chap bad hash value length: "
4161 "%d bytes, should be %d\n",
4162 SPP_ARGS(ifp), value_len,
4163 AUTHKEYLEN);
4164 break;
4165 }
4166
4167 MD5Init(&ctx);
4168 MD5Update(&ctx, &h->ident, 1);
4169 MD5Update(&ctx, sp->hisauth.secret,
4170 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4171 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4172 MD5Final(digest, &ctx);
4173
4174 #define FAILMSG "Failed..."
4175 #define SUCCMSG "Welcome!"
4176
4177 if (value_len != sizeof digest ||
4178 bcmp(digest, value, value_len) != 0) {
4179 /* action scn, tld */
4180 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4181 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4182 0);
4183 chap.tld(sp);
4184 break;
4185 }
4186 /* action sca, perhaps tlu */
4187 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4188 sp->state[IDX_CHAP] == STATE_OPENED)
4189 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4190 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4191 0);
4192 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4193 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4194 chap.tlu(sp);
4195 }
4196 break;
4197
4198 default:
4199 /* Unknown CHAP packet type -- ignore. */
4200 if (debug) {
4201 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4202 "<0x%x id=0x%xh len=%d",
4203 SPP_ARGS(ifp),
4204 sppp_state_name(sp->state[IDX_CHAP]),
4205 h->type, h->ident, ntohs(h->len));
4206 sppp_print_bytes((u_char*)(h+1), len-4);
4207 addlog(">\n");
4208 }
4209 break;
4210
4211 }
4212 }
4213
4214 static void
4215 sppp_chap_init(struct sppp *sp)
4216 {
4217 /* Chap doesn't have STATE_INITIAL at all. */
4218 sp->state[IDX_CHAP] = STATE_CLOSED;
4219 sp->fail_counter[IDX_CHAP] = 0;
4220 sp->pp_seq[IDX_CHAP] = 0;
4221 sp->pp_rseq[IDX_CHAP] = 0;
4222 #if defined(__DragonFly__)
4223 callout_init(&sp->timeout[IDX_CHAP]);
4224 #endif
4225 }
4226
4227 static void
4228 sppp_chap_open(struct sppp *sp)
4229 {
4230 if (sp->myauth.proto == PPP_CHAP &&
4231 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4232 /* we are authenticator for CHAP, start it */
4233 chap.scr(sp);
4234 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4235 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4236 }
4237 /* nothing to be done if we are peer, await a challenge */
4238 }
4239
4240 static void
4241 sppp_chap_close(struct sppp *sp)
4242 {
4243 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4244 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4245 }
4246
4247 static void
4248 sppp_chap_TO(void *cookie)
4249 {
4250 struct sppp *sp = (struct sppp *)cookie;
4251 STDDCL;
4252
4253 crit_enter();
4254
4255 if (debug)
4256 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4257 SPP_ARGS(ifp),
4258 sppp_state_name(sp->state[IDX_CHAP]),
4259 sp->rst_counter[IDX_CHAP]);
4260
4261 if (--sp->rst_counter[IDX_CHAP] < 0)
4262 /* TO- event */
4263 switch (sp->state[IDX_CHAP]) {
4264 case STATE_REQ_SENT:
4265 chap.tld(sp);
4266 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4267 break;
4268 }
4269 else
4270 /* TO+ (or TO*) event */
4271 switch (sp->state[IDX_CHAP]) {
4272 case STATE_OPENED:
4273 /* TO* event */
4274 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4275 /* fall through */
4276 case STATE_REQ_SENT:
4277 chap.scr(sp);
4278 /* sppp_cp_change_state() will restart the timer */
4279 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4280 break;
4281 }
4282
4283 crit_exit();
4284 }
4285
4286 static void
4287 sppp_chap_tlu(struct sppp *sp)
4288 {
4289 STDDCL;
4290 int i;
4291
4292 i = 0;
4293 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4294
4295 /*
4296 * Some broken CHAP implementations (Conware CoNet, firmware
4297 * 4.0.?) don't want to re-authenticate their CHAP once the
4298 * initial challenge-response exchange has taken place.
4299 * Provide for an option to avoid rechallenges.
4300 */
4301 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4302 /*
4303 * Compute the re-challenge timeout. This will yield
4304 * a number between 300 and 810 seconds.
4305 */
4306 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4307 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4308 }
4309
4310 if (debug) {
4311 log(LOG_DEBUG,
4312 SPP_FMT "chap %s, ",
4313 SPP_ARGS(ifp),
4314 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4315 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4316 addlog("next re-challenge in %d seconds\n", i);
4317 else
4318 addlog("re-challenging supressed\n");
4319 }
4320
4321 crit_enter();
4322
4323 /* indicate to LCP that we need to be closed down */
4324 sp->lcp.protos |= (1 << IDX_CHAP);
4325
4326 if (sp->pp_flags & PP_NEEDAUTH) {
4327 /*
4328 * Remote is authenticator, but his auth proto didn't
4329 * complete yet. Defer the transition to network
4330 * phase.
4331 */
4332 crit_exit();
4333 return;
4334 }
4335
4336 crit_exit();
4337
4338 /*
4339 * If we are already in phase network, we are done here. This
4340 * is the case if this is a dummy tlu event after a re-challenge.
4341 */
4342 if (sp->pp_phase != PHASE_NETWORK)
4343 sppp_phase_network(sp);
4344 }
4345
4346 static void
4347 sppp_chap_tld(struct sppp *sp)
4348 {
4349 STDDCL;
4350
4351 if (debug)
4352 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4353 callout_stop(&sp->timeout[IDX_CHAP]);
4354 sp->lcp.protos &= ~(1 << IDX_CHAP);
4355
4356 lcp.Close(sp);
4357 }
4358
4359 static void
4360 sppp_chap_scr(struct sppp *sp)
4361 {
4362 u_long *ch, seed;
4363 u_char clen;
4364
4365 /* Compute random challenge. */
4366 ch = (u_long *)sp->myauth.challenge;
4367 #if defined(__DragonFly__)
4368 read_random(&seed, sizeof seed);
4369 #else
4370 {
4371 struct timeval tv;
4372 microtime(&tv);
4373 seed = tv.tv_sec ^ tv.tv_usec;
4374 }
4375 #endif
4376 ch[0] = seed ^ random();
4377 ch[1] = seed ^ random();
4378 ch[2] = seed ^ random();
4379 ch[3] = seed ^ random();
4380 clen = AUTHKEYLEN;
4381
4382 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4383
4384 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4385 sizeof clen, (const char *)&clen,
4386 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4387 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4388 sp->myauth.name,
4389 0);
4390 }
4391
4392 /*
4393 *--------------------------------------------------------------------------*
4394 * *
4395 * The PAP implementation. *
4396 * *
4397 *--------------------------------------------------------------------------*
4398 */
4399 /*
4400 * For PAP, we need to keep a little state also if we are the peer, not the
4401 * authenticator. This is since we don't get a request to authenticate, but
4402 * have to repeatedly authenticate ourself until we got a response (or the
4403 * retry counter is expired).
4404 */
4405
4406 /*
4407 * Handle incoming PAP packets. */
4408 static void
4409 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4410 {
4411 STDDCL;
4412 struct lcp_header *h;
4413 int len;
4414 u_char *name, *passwd, mlen;
4415 int name_len, passwd_len;
4416
4417 /*
4418 * Malicious input might leave this uninitialized, so
4419 * init to an impossible value.
4420 */
4421 passwd_len = -1;
4422
4423 len = m->m_pkthdr.len;
4424 if (len < 5) {
4425 if (debug)
4426 log(LOG_DEBUG,
4427 SPP_FMT "pap invalid packet length: %d bytes\n",
4428 SPP_ARGS(ifp), len);
4429 return;
4430 }
4431 h = mtod (m, struct lcp_header*);
4432 if (len > ntohs (h->len))
4433 len = ntohs (h->len);
4434 switch (h->type) {
4435 /* PAP request is my authproto */
4436 case PAP_REQ:
4437 name = 1 + (u_char*)(h+1);
4438 name_len = name[-1];
4439 passwd = name + name_len + 1;
4440 if (name_len > len - 6 ||
4441 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4442 if (debug) {
4443 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4444 "<%s id=0x%x len=%d",
4445 SPP_ARGS(ifp),
4446 sppp_auth_type_name(PPP_PAP, h->type),
4447 h->ident, ntohs(h->len));
4448 sppp_print_bytes((u_char*)(h+1), len-4);
4449 addlog(">\n");
4450 }
4451 break;
4452 }
4453 if (debug) {
4454 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4455 "<%s id=0x%x len=%d name=",
4456 SPP_ARGS(ifp),
4457 sppp_state_name(sp->state[IDX_PAP]),
4458 sppp_auth_type_name(PPP_PAP, h->type),
4459 h->ident, ntohs(h->len));
4460 sppp_print_string((char*)name, name_len);
4461 addlog(" passwd=");
4462 sppp_print_string((char*)passwd, passwd_len);
4463 addlog(">\n");
4464 }
4465 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4466 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4467 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4468 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4469 /* action scn, tld */
4470 mlen = sizeof(FAILMSG) - 1;
4471 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4472 sizeof mlen, (const char *)&mlen,
4473 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4474 0);
4475 pap.tld(sp);
4476 break;
4477 }
4478 /* action sca, perhaps tlu */
4479 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4480 sp->state[IDX_PAP] == STATE_OPENED) {
4481 mlen = sizeof(SUCCMSG) - 1;
4482 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4483 sizeof mlen, (const char *)&mlen,
4484 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4485 0);
4486 }
4487 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4488 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4489 pap.tlu(sp);
4490 }
4491 break;
4492
4493 /* ack and nak are his authproto */
4494 case PAP_ACK:
4495 callout_stop(&sp->pap_my_to);
4496 if (debug) {
4497 log(LOG_DEBUG, SPP_FMT "pap success",
4498 SPP_ARGS(ifp));
4499 name = 1 + (u_char *)(h + 1);
4500 name_len = name[-1];
4501 if (len > 5 && name_len < len+4) {
4502 addlog(": ");
4503 sppp_print_string(name, name_len);
4504 }
4505 addlog("\n");
4506 }
4507
4508 crit_enter();
4509
4510 sp->pp_flags &= ~PP_NEEDAUTH;
4511 if (sp->myauth.proto == PPP_PAP &&
4512 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4513 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4514 /*
4515 * We are authenticator for PAP but didn't
4516 * complete yet. Leave it to tlu to proceed
4517 * to network phase.
4518 */
4519
4520 crit_exit();
4521
4522 break;
4523 }
4524
4525 crit_exit();
4526
4527 sppp_phase_network(sp);
4528 break;
4529
4530 case PAP_NAK:
4531 callout_stop(&sp->pap_my_to);
4532 if (debug) {
4533 log(LOG_INFO, SPP_FMT "pap failure",
4534 SPP_ARGS(ifp));
4535 name = 1 + (u_char *)(h + 1);
4536 name_len = name[-1];
4537 if (len > 5 && name_len < len+4) {
4538 addlog(": ");
4539 sppp_print_string(name, name_len);
4540 }
4541 addlog("\n");
4542 } else
4543 log(LOG_INFO, SPP_FMT "pap failure\n",
4544 SPP_ARGS(ifp));
4545 /* await LCP shutdown by authenticator */
4546 break;
4547
4548 default:
4549 /* Unknown PAP packet type -- ignore. */
4550 if (debug) {
4551 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4552 "<0x%x id=0x%x len=%d",
4553 SPP_ARGS(ifp),
4554 h->type, h->ident, ntohs(h->len));
4555 sppp_print_bytes((u_char*)(h+1), len-4);
4556 addlog(">\n");
4557 }
4558 break;
4559
4560 }
4561 }
4562
4563 static void
4564 sppp_pap_init(struct sppp *sp)
4565 {
4566 /* PAP doesn't have STATE_INITIAL at all. */
4567 sp->state[IDX_PAP] = STATE_CLOSED;
4568 sp->fail_counter[IDX_PAP] = 0;
4569 sp->pp_seq[IDX_PAP] = 0;
4570 sp->pp_rseq[IDX_PAP] = 0;
4571 #if defined(__DragonFly__)
4572 callout_init(&sp->timeout[IDX_PAP]);
4573 callout_init(&sp->pap_my_to);
4574 #endif
4575 }
4576
4577 static void
4578 sppp_pap_open(struct sppp *sp)
4579 {
4580 if (sp->hisauth.proto == PPP_PAP &&
4581 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4582 /* we are authenticator for PAP, start our timer */
4583 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4584 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4585 }
4586 if (sp->myauth.proto == PPP_PAP) {
4587 /* we are peer, send a request, and start a timer */
4588 pap.scr(sp);
4589 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4590 sppp_pap_my_TO, sp);
4591 }
4592 }
4593
4594 static void
4595 sppp_pap_close(struct sppp *sp)
4596 {
4597 if (sp->state[IDX_PAP] != STATE_CLOSED)
4598 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4599 }
4600
4601 /*
4602 * That's the timeout routine if we are authenticator. Since the
4603 * authenticator is basically passive in PAP, we can't do much here.
4604 */
4605 static void
4606 sppp_pap_TO(void *cookie)
4607 {
4608 struct sppp *sp = (struct sppp *)cookie;
4609 STDDCL;
4610
4611 crit_enter();
4612
4613 if (debug)
4614 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4615 SPP_ARGS(ifp),
4616 sppp_state_name(sp->state[IDX_PAP]),
4617 sp->rst_counter[IDX_PAP]);
4618
4619 if (--sp->rst_counter[IDX_PAP] < 0)
4620 /* TO- event */
4621 switch (sp->state[IDX_PAP]) {
4622 case STATE_REQ_SENT:
4623 pap.tld(sp);
4624 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4625 break;
4626 }
4627 else
4628 /* TO+ event, not very much we could do */
4629 switch (sp->state[IDX_PAP]) {
4630 case STATE_REQ_SENT:
4631 /* sppp_cp_change_state() will restart the timer */
4632 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4633 break;
4634 }
4635
4636 crit_exit();
4637 }
4638
4639 /*
4640 * That's the timeout handler if we are peer. Since the peer is active,
4641 * we need to retransmit our PAP request since it is apparently lost.
4642 * XXX We should impose a max counter.
4643 */
4644 static void
4645 sppp_pap_my_TO(void *cookie)
4646 {
4647 struct sppp *sp = (struct sppp *)cookie;
4648 STDDCL;
4649
4650 if (debug)
4651 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4652 SPP_ARGS(ifp));
4653
4654 pap.scr(sp);
4655 }
4656
4657 static void
4658 sppp_pap_tlu(struct sppp *sp)
4659 {
4660 STDDCL;
4661
4662 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4663
4664 if (debug)
4665 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4666 SPP_ARGS(ifp), pap.name);
4667
4668 crit_enter();
4669
4670 /* indicate to LCP that we need to be closed down */
4671 sp->lcp.protos |= (1 << IDX_PAP);
4672
4673 if (sp->pp_flags & PP_NEEDAUTH) {
4674 /*
4675 * Remote is authenticator, but his auth proto didn't
4676 * complete yet. Defer the transition to network
4677 * phase.
4678 */
4679 crit_exit();
4680 return;
4681 }
4682 crit_exit();
4683 sppp_phase_network(sp);
4684 }
4685
4686 static void
4687 sppp_pap_tld(struct sppp *sp)
4688 {
4689 STDDCL;
4690
4691 if (debug)
4692 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4693 callout_stop(&sp->timeout[IDX_PAP]);
4694 callout_stop(&sp->pap_my_to);
4695 sp->lcp.protos &= ~(1 << IDX_PAP);
4696
4697 lcp.Close(sp);
4698 }
4699
4700 static void
4701 sppp_pap_scr(struct sppp *sp)
4702 {
4703 u_char idlen, pwdlen;
4704
4705 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4706 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4707 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4708
4709 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4710 sizeof idlen, (const char *)&idlen,
4711 (size_t)idlen, sp->myauth.name,
4712 sizeof pwdlen, (const char *)&pwdlen,
4713 (size_t)pwdlen, sp->myauth.secret,
4714 0);
4715 }
4716
4717 /*
4718 * Random miscellaneous functions.
4719 */
4720
4721 /*
4722 * Send a PAP or CHAP proto packet.
4723 *
4724 * Varadic function, each of the elements for the ellipsis is of type
4725 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4726 * mlen == 0.
4727 * NOTE: never declare variadic functions with types subject to type
4728 * promotion (i.e. u_char). This is asking for big trouble depending
4729 * on the architecture you are on...
4730 */
4731
4732 static void
4733 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4734 unsigned int type, unsigned int id,
4735 ...)
4736 {
4737 STDDCL;
4738 struct ppp_header *h;
4739 struct lcp_header *lh;
4740 struct mbuf *m;
4741 u_char *p;
4742 int len;
4743 unsigned int mlen;
4744 const char *msg;
4745 __va_list ap;
4746
4747 MGETHDR (m, MB_DONTWAIT, MT_DATA);
4748 if (! m)
4749 return;
4750 m->m_pkthdr.rcvif = 0;
4751
4752 h = mtod (m, struct ppp_header*);
4753 h->address = PPP_ALLSTATIONS; /* broadcast address */
4754 h->control = PPP_UI; /* Unnumbered Info */
4755 h->protocol = htons(cp->proto);
4756
4757 lh = (struct lcp_header*)(h + 1);
4758 lh->type = type;
4759 lh->ident = id;
4760 p = (u_char*) (lh+1);
4761
4762 __va_start(ap, id);
4763 len = 0;
4764
4765 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4766 msg = __va_arg(ap, const char *);
4767 len += mlen;
4768 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4769 __va_end(ap);
4770 m_freem(m);
4771 return;
4772 }
4773
4774 bcopy(msg, p, mlen);
4775 p += mlen;
4776 }
4777 __va_end(ap);
4778
4779 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4780 lh->len = htons (LCP_HEADER_LEN + len);
4781
4782 if (debug) {
4783 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4784 SPP_ARGS(ifp), cp->name,
4785 sppp_auth_type_name(cp->proto, lh->type),
4786 lh->ident, ntohs(lh->len));
4787 sppp_print_bytes((u_char*) (lh+1), len);
4788 addlog(">\n");
4789 }
4790 if (IF_QFULL (&sp->pp_cpq)) {
4791 IF_DROP (&sp->pp_fastq);
4792 IF_DROP (&ifp->if_snd);
4793 m_freem (m);
4794 ++ifp->if_oerrors;
4795 } else
4796 IF_ENQUEUE (&sp->pp_cpq, m);
4797 if (! (ifp->if_flags & IFF_OACTIVE))
4798 (*ifp->if_start) (ifp);
4799 ifp->if_obytes += m->m_pkthdr.len + 3;
4800 }
4801
4802 /*
4803 * Send keepalive packets, every 10 seconds.
4804 */
4805 static void
4806 sppp_keepalive(void *dummy)
4807 {
4808 struct sppp *sp;
4809
4810 crit_enter();
4811
4812 for (sp=spppq; sp; sp=sp->pp_next) {
4813 struct ifnet *ifp = &sp->pp_if;
4814
4815 /* Keepalive mode disabled or channel down? */
4816 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4817 ! (ifp->if_flags & IFF_RUNNING))
4818 continue;
4819
4820 /* No keepalive in PPP mode if LCP not opened yet. */
4821 if (sp->pp_mode != IFF_CISCO &&
4822 sp->pp_phase < PHASE_AUTHENTICATE)
4823 continue;
4824
4825 if (sp->pp_alivecnt == MAXALIVECNT) {
4826 /* No keepalive packets got. Stop the interface. */
4827 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4828 if_down (ifp);
4829 IF_DRAIN(&sp->pp_cpq);
4830 if (sp->pp_mode != IFF_CISCO) {
4831 /* XXX */
4832 /* Shut down the PPP link. */
4833 lcp.Down(sp);
4834 /* Initiate negotiation. XXX */
4835 lcp.Up(sp);
4836 }
4837 }
4838 lwkt_serialize_enter(ifp->if_serializer);
4839 if (sp->pp_alivecnt <= MAXALIVECNT)
4840 ++sp->pp_alivecnt;
4841 if (sp->pp_mode == IFF_CISCO)
4842 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4843 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4844 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4845 long nmagic = htonl (sp->lcp.magic);
4846 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4847 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4848 sp->lcp.echoid, 4, &nmagic);
4849 }
4850 lwkt_serialize_exit(ifp->if_serializer);
4851 }
4852 callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4853 crit_exit();
4854 }
4855
4856 /*
4857 * Get both IP addresses.
4858 */
4859 static void
4860 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4861 {
4862 struct ifnet *ifp = &sp->pp_if;
4863 struct ifaddr *ifa;
4864 struct sockaddr_in *si, *sm;
4865 u_long ssrc, ddst;
4866
4867 sm = NULL;
4868 ssrc = ddst = 0L;
4869 /*
4870 * Pick the first AF_INET address from the list,
4871 * aliases don't make any sense on a p2p link anyway.
4872 */
4873 si = 0;
4874 #if defined(__DragonFly__)
4875 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4876 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4877 for (ifa = ifp->if_addrlist.tqh_first;
4878 ifa;
4879 ifa = ifa->ifa_list.tqe_next)
4880 #else
4881 for (ifa = ifp->if_addrlist;
4882 ifa;
4883 ifa = ifa->ifa_next)
4884 #endif
4885 if (ifa->ifa_addr->sa_family == AF_INET) {
4886 si = (struct sockaddr_in *)ifa->ifa_addr;
4887 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4888 if (si)
4889 break;
4890 }
4891 if (ifa) {
4892 if (si && si->sin_addr.s_addr) {
4893 ssrc = si->sin_addr.s_addr;
4894 if (srcmask)
4895 *srcmask = ntohl(sm->sin_addr.s_addr);
4896 }
4897
4898 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4899 if (si && si->sin_addr.s_addr)
4900 ddst = si->sin_addr.s_addr;
4901 }
4902
4903 if (dst) *dst = ntohl(ddst);
4904 if (src) *src = ntohl(ssrc);
4905 }
4906
4907 /*
4908 * Set my IP address. Must be called at splimp.
4909 */
4910 static void
4911 sppp_set_ip_addr(struct sppp *sp, u_long src)
4912 {
4913 STDDCL;
4914 struct ifaddr *ifa;
4915 struct sockaddr_in *si;
4916 struct in_ifaddr *ia;
4917
4918 /*
4919 * Pick the first AF_INET address from the list,
4920 * aliases don't make any sense on a p2p link anyway.
4921 */
4922 si = 0;
4923 #if defined(__DragonFly__)
4924 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4925 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4926 for (ifa = ifp->if_addrlist.tqh_first;
4927 ifa;
4928 ifa = ifa->ifa_list.tqe_next)
4929 #else
4930 for (ifa = ifp->if_addrlist;
4931 ifa;
4932 ifa = ifa->ifa_next)
4933 #endif
4934 {
4935 if (ifa->ifa_addr->sa_family == AF_INET)
4936 {
4937 si = (struct sockaddr_in *)ifa->ifa_addr;
4938 if (si)
4939 break;
4940 }
4941 }
4942
4943 if (ifa && si)
4944 {
4945 int error;
4946 #if __NetBSD_Version__ >= 103080000
4947 struct sockaddr_in new_sin = *si;
4948
4949 new_sin.sin_addr.s_addr = htonl(src);
4950 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
4951 if(debug && error)
4952 {
4953 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
4954 " failed, error=%d\n", SPP_ARGS(ifp), error);
4955 }
4956 #else
4957 /* delete old route */
4958 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4959 if(debug && error)
4960 {
4961 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4962 SPP_ARGS(ifp), error);
4963 }
4964
4965 /* set new address */
4966 si->sin_addr.s_addr = htonl(src);
4967 ia = ifatoia(ifa);
4968 LIST_REMOVE(ia, ia_hash);
4969 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4970
4971 /* add new route */
4972 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4973 if (debug && error)
4974 {
4975 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4976 SPP_ARGS(ifp), error);
4977 }
4978 #endif
4979 }
4980 }
4981
4982 #ifdef INET6
4983 /*
4984 * Get both IPv6 addresses.
4985 */
4986 static void
4987 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4988 struct in6_addr *srcmask)
4989 {
4990 struct ifnet *ifp = &sp->pp_if;
4991 struct ifaddr *ifa;
4992 struct sockaddr_in6 *si, *sm;
4993 struct in6_addr ssrc, ddst;
4994
4995 sm = NULL;
4996 bzero(&ssrc, sizeof(ssrc));
4997 bzero(&ddst, sizeof(ddst));
4998 /*
4999 * Pick the first link-local AF_INET6 address from the list,
5000 * aliases don't make any sense on a p2p link anyway.
5001 */
5002 #if defined(__DragonFly__)
5003 si = 0;
5004 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
5005 #elif defined(__NetBSD__) || defined (__OpenBSD__)
5006 for (ifa = ifp->if_addrlist.tqh_first, si = 0;
5007 ifa;
5008 ifa = ifa->ifa_list.tqe_next)
5009 #else
5010 for (ifa = ifp->if_addrlist, si = 0;
5011 ifa;
5012 ifa = ifa->ifa_next)
5013 #endif
5014 if (ifa->ifa_addr->sa_family == AF_INET6) {
5015 si = (struct sockaddr_in6 *)ifa->ifa_addr;
5016 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
5017 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
5018 break;
5019 }
5020 if (ifa) {
5021 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
5022 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
5023 if (srcmask) {
5024 bcopy(&sm->sin6_addr, srcmask,
5025 sizeof(*srcmask));
5026 }
5027 }
5028
5029 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
5030 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
5031 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
5032 }
5033
5034 if (dst)
5035 bcopy(&ddst, dst, sizeof(*dst));
5036 if (src)
5037 bcopy(&ssrc, src, sizeof(*src));
5038 }
5039
5040 #ifdef IPV6CP_MYIFID_DYN
5041 /*
5042 * Generate random ifid.
5043 */
5044 static void
5045 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
5046 {
5047 /* TBD */
5048 }
5049
5050 /*
5051 * Set my IPv6 address. Must be called at splimp.
5052 */
5053 static void
5054 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
5055 {
5056 STDDCL;
5057 struct ifaddr *ifa;
5058 struct sockaddr_in6 *sin6;
5059
5060 /*
5061 * Pick the first link-local AF_INET6 address from the list,
5062 * aliases don't make any sense on a p2p link anyway.
5063 */
5064
5065 sin6 = NULL;
5066 #if defined(__DragonFly__)
5067 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
5068 #elif defined(__NetBSD__) || defined (__OpenBSD__)
5069 for (ifa = ifp->if_addrlist.tqh_first;
5070 ifa;
5071 ifa = ifa->ifa_list.tqe_next)
5072 #else
5073 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
5074 #endif
5075 {
5076 if (ifa->ifa_addr->sa_family == AF_INET6)
5077 {
5078 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5079 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
5080 break;
5081 }
5082 }
5083
5084 if (ifa && sin6)
5085 {
5086 int error;
5087 struct sockaddr_in6 new_sin6 = *sin6;
5088
5089 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5090 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5091 if (debug && error)
5092 {
5093 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5094 " failed, error=%d\n", SPP_ARGS(ifp), error);
5095 }
5096 }
5097 }
5098 #endif
5099
5100 /*
5101 * Suggest a candidate address to be used by peer.
5102 */
5103 static void
5104 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5105 {
5106 struct in6_addr myaddr;
5107 struct timeval tv;
5108
5109 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5110
5111 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
5112 microtime(&tv);
5113 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5114 myaddr.s6_addr[14] ^= 0xff;
5115 myaddr.s6_addr[15] ^= 0xff;
5116 } else {
5117 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5118 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5119 }
5120 if (suggest)
5121 bcopy(&myaddr, suggest, sizeof(myaddr));
5122 }
5123 #endif /*INET6*/
5124
5125 static int
5126 sppp_params(struct sppp *sp, u_long cmd, void *data)
5127 {
5128 u_long subcmd;
5129 struct ifreq *ifr = (struct ifreq *)data;
5130 struct spppreq *spr;
5131 int rv = 0;
5132
5133 spr = malloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
5134
5135 /*
5136 * ifr->ifr_data is supposed to point to a struct spppreq.
5137 * Check the cmd word first before attempting to fetch all the
5138 * data.
5139 */
5140 if ((subcmd = fuword(ifr->ifr_data)) == -1) {
5141 rv = EFAULT;
5142 goto quit;
5143 }
5144
5145 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5146 rv = EFAULT;
5147 goto quit;
5148 }
5149
5150 switch (subcmd) {
5151 case (int)SPPPIOGDEFS:
5152 if (cmd != SIOCGIFGENERIC) {
5153 rv = EINVAL;
5154 break;
5155 }
5156 /*
5157 * We copy over the entire current state, but clean
5158 * out some of the stuff we don't wanna pass up.
5159 * Remember, SIOCGIFGENERIC is unprotected, and can be
5160 * called by any user. No need to ever get PAP or
5161 * CHAP secrets back to userland anyway.
5162 */
5163 spr->defs.pp_phase = sp->pp_phase;
5164 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5165 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5166 spr->defs.lcp = sp->lcp;
5167 spr->defs.ipcp = sp->ipcp;
5168 spr->defs.ipv6cp = sp->ipv6cp;
5169 spr->defs.myauth = sp->myauth;
5170 spr->defs.hisauth = sp->hisauth;
5171 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5172 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5173 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5174 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5175 /*
5176 * Fixup the LCP timeout value to milliseconds so
5177 * spppcontrol doesn't need to bother about the value
5178 * of "hz". We do the reverse calculation below when
5179 * setting it.
5180 */
5181 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5182 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5183 sizeof(struct spppreq));
5184 break;
5185
5186 case (int)SPPPIOSDEFS:
5187 if (cmd != SIOCSIFGENERIC) {
5188 rv = EINVAL;
5189 break;
5190 }
5191 /*
5192 * We have a very specific idea of which fields we
5193 * allow being passed back from userland, so to not
5194 * clobber our current state. For one, we only allow
5195 * setting anything if LCP is in dead or establish
5196 * phase. Once the authentication negotiations
5197 * started, the authentication settings must not be
5198 * changed again. (The administrator can force an
5199 * ifconfig down in order to get LCP back into dead
5200 * phase.)
5201 *
5202 * Also, we only allow for authentication parameters to be
5203 * specified.
5204 *
5205 * XXX Should allow to set or clear pp_flags.
5206 *
5207 * Finally, if the respective authentication protocol to
5208 * be used is set differently than 0, but the secret is
5209 * passed as all zeros, we don't trash the existing secret.
5210 * This allows an administrator to change the system name
5211 * only without clobbering the secret (which he didn't get
5212 * back in a previous SPPPIOGDEFS call). However, the
5213 * secrets are cleared if the authentication protocol is
5214 * reset to 0. */
5215 if (sp->pp_phase != PHASE_DEAD &&
5216 sp->pp_phase != PHASE_ESTABLISH) {
5217 rv = EBUSY;
5218 break;
5219 }
5220
5221 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5222 spr->defs.myauth.proto != PPP_CHAP) ||
5223 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5224 spr->defs.hisauth.proto != PPP_CHAP)) {
5225 rv = EINVAL;
5226 break;
5227 }
5228
5229 if (spr->defs.myauth.proto == 0)
5230 /* resetting myauth */
5231 bzero(&sp->myauth, sizeof sp->myauth);
5232 else {
5233 /* setting/changing myauth */
5234 sp->myauth.proto = spr->defs.myauth.proto;
5235 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5236 if (spr->defs.myauth.secret[0] != '\0')
5237 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5238 AUTHKEYLEN);
5239 }
5240 if (spr->defs.hisauth.proto == 0)
5241 /* resetting hisauth */
5242 bzero(&sp->hisauth, sizeof sp->hisauth);
5243 else {
5244 /* setting/changing hisauth */
5245 sp->hisauth.proto = spr->defs.hisauth.proto;
5246 sp->hisauth.flags = spr->defs.hisauth.flags;
5247 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5248 if (spr->defs.hisauth.secret[0] != '\0')
5249 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5250 AUTHKEYLEN);
5251 }
5252 /* set LCP restart timer timeout */
5253 if (spr->defs.lcp.timeout != 0)
5254 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5255 /* set VJ enable and IPv6 disable flags */
5256 #ifdef INET
5257 if (spr->defs.enable_vj)
5258 sp->confflags |= CONF_ENABLE_VJ;
5259 else
5260 sp->confflags &= ~CONF_ENABLE_VJ;
5261 #endif
5262 #ifdef INET6
5263 if (spr->defs.enable_ipv6)
5264 sp->confflags |= CONF_ENABLE_IPV6;
5265 else
5266 sp->confflags &= ~CONF_ENABLE_IPV6;
5267 #endif
5268 break;
5269
5270 default:
5271 rv = EINVAL;
5272 }
5273
5274 quit:
5275 free(spr, M_TEMP);
5276
5277 return (rv);
5278 }
5279
5280 static void
5281 sppp_phase_network(struct sppp *sp)
5282 {
5283 STDDCL;
5284 int i;
5285 u_long mask;
5286
5287 sp->pp_phase = PHASE_NETWORK;
5288
5289 if (debug)
5290 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5291 sppp_phase_name(sp->pp_phase));
5292
5293 /* Notify NCPs now. */
5294 for (i = 0; i < IDX_COUNT; i++)
5295 if ((cps[i])->flags & CP_NCP)
5296 (cps[i])->Open(sp);
5297
5298 /* Send Up events to all NCPs. */
5299 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5300 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5301 (cps[i])->Up(sp);
5302
5303 /* if no NCP is starting, all this was in vain, close down */
5304 sppp_lcp_check_and_close(sp);
5305 }
5306
5307
5308 static const char *
5309 sppp_cp_type_name(u_char type)
5310 {
5311 static char buf[12];
5312 switch (type) {
5313 case CONF_REQ: return "conf-req";
5314 case CONF_ACK: return "conf-ack";
5315 case CONF_NAK: return "conf-nak";
5316 case CONF_REJ: return "conf-rej";
5317 case TERM_REQ: return "term-req";
5318 case TERM_ACK: return "term-ack";
5319 case CODE_REJ: return "code-rej";
5320 case PROTO_REJ: return "proto-rej";
5321 case ECHO_REQ: return "echo-req";
5322 case ECHO_REPLY: return "echo-reply";
5323 case DISC_REQ: return "discard-req";
5324 }
5325 snprintf (buf, sizeof(buf), "cp/0x%x", type);
5326 return buf;
5327 }
5328
5329 static const char *
5330 sppp_auth_type_name(u_short proto, u_char type)
5331 {
5332 static char buf[12];
5333 switch (proto) {
5334 case PPP_CHAP:
5335 switch (type) {
5336 case CHAP_CHALLENGE: return "challenge";
5337 case CHAP_RESPONSE: return "response";
5338 case CHAP_SUCCESS: return "success";
5339 case CHAP_FAILURE: return "failure";
5340 }
5341 case PPP_PAP:
5342 switch (type) {
5343 case PAP_REQ: return "req";
5344 case PAP_ACK: return "ack";
5345 case PAP_NAK: return "nak";
5346 }
5347 }
5348 snprintf (buf, sizeof(buf), "auth/0x%x", type);
5349 return buf;
5350 }
5351
5352 static const char *
5353 sppp_lcp_opt_name(u_char opt)
5354 {
5355 static char buf[12];
5356 switch (opt) {
5357 case LCP_OPT_MRU: return "mru";
5358 case LCP_OPT_ASYNC_MAP: return "async-map";
5359 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5360 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5361 case LCP_OPT_MAGIC: return "magic";
5362 case LCP_OPT_PROTO_COMP: return "proto-comp";
5363 case LCP_OPT_ADDR_COMP: return "addr-comp";
5364 }
5365 snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5366 return buf;
5367 }
5368
5369 static const char *
5370 sppp_ipcp_opt_name(u_char opt)
5371 {
5372 static char buf[12];
5373 switch (opt) {
5374 case IPCP_OPT_ADDRESSES: return "addresses";
5375 case IPCP_OPT_COMPRESSION: return "compression";
5376 case IPCP_OPT_ADDRESS: return "address";
5377 }
5378 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5379 return buf;
5380 }
5381
5382 #ifdef INET6
5383 static const char *
5384 sppp_ipv6cp_opt_name(u_char opt)
5385 {
5386 static char buf[12];
5387 switch (opt) {
5388 case IPV6CP_OPT_IFID: return "ifid";
5389 case IPV6CP_OPT_COMPRESSION: return "compression";
5390 }
5391 sprintf (buf, "0x%x", opt);
5392 return buf;
5393 }
5394 #endif
5395
5396 static const char *
5397 sppp_state_name(int state)
5398 {
5399 switch (state) {
5400 case STATE_INITIAL: return "initial";
5401 case STATE_STARTING: return "starting";
5402 case STATE_CLOSED: return "closed";
5403 case STATE_STOPPED: return "stopped";
5404 case STATE_CLOSING: return "closing";
5405 case STATE_STOPPING: return "stopping";
5406 case STATE_REQ_SENT: return "req-sent";
5407 case STATE_ACK_RCVD: return "ack-rcvd";
5408 case STATE_ACK_SENT: return "ack-sent";
5409 case STATE_OPENED: return "opened";
5410 }
5411 return "illegal";
5412 }
5413
5414 static const char *
5415 sppp_phase_name(enum ppp_phase phase)
5416 {
5417 switch (phase) {
5418 case PHASE_DEAD: return "dead";
5419 case PHASE_ESTABLISH: return "establish";
5420 case PHASE_TERMINATE: return "terminate";
5421 case PHASE_AUTHENTICATE: return "authenticate";
5422 case PHASE_NETWORK: return "network";
5423 }
5424 return "illegal";
5425 }
5426
5427 static const char *
5428 sppp_proto_name(u_short proto)
5429 {
5430 static char buf[12];
5431 switch (proto) {
5432 case PPP_LCP: return "lcp";
5433 case PPP_IPCP: return "ipcp";
5434 case PPP_PAP: return "pap";
5435 case PPP_CHAP: return "chap";
5436 case PPP_IPV6CP: return "ipv6cp";
5437 }
5438 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5439 return buf;
5440 }
5441
5442 static void
5443 sppp_print_bytes(const u_char *p, u_short len)
5444 {
5445 if (len)
5446 addlog(" %*D", len, p, "-");
5447 }
5448
5449 static void
5450 sppp_print_string(const char *p, u_short len)
5451 {
5452 u_char c;
5453
5454 while (len-- > 0) {
5455 c = *p++;
5456 /*
5457 * Print only ASCII chars directly. RFC 1994 recommends
5458 * using only them, but we don't rely on it. */
5459 if (c < ' ' || c > '~')
5460 addlog("\\x%x", c);
5461 else
5462 addlog("%c", c);
5463 }
5464 }
5465
5466 static const char *
5467 sppp_dotted_quad(u_long addr)
5468 {
5469 static char s[16];
5470 sprintf(s, "%d.%d.%d.%d",
5471 (int)((addr >> 24) & 0xff),
5472 (int)((addr >> 16) & 0xff),
5473 (int)((addr >> 8) & 0xff),
5474 (int)(addr & 0xff));
5475 return s;
5476 }
5477
5478 static int
5479 sppp_strnlen(u_char *p, int max)
5480 {
5481 int len;
5482
5483 for (len = 0; len < max && *p; ++p)
5484 ++len;
5485 return len;
5486 }
5487
5488 /* a dummy, used to drop uninteresting events */
5489 static void
5490 sppp_null(struct sppp *unused)
5491 {
5492 /* do just nothing */
5493 }
MP support for (parts of) the network stack