1 /*
2 * Synchronous PPP/Cisco/Frame Relay link level subroutines.
3 * Keepalive protocol implemented in both Cisco and PPP modes.
4 */
5 /*-
6 * Copyright (C) 1994-2000 Cronyx Engineering.
7 * Author: Serge Vakulenko, <[email protected]>
8 *
9 * Heavily revamped to conform to RFC 1661.
10 * Copyright (C) 1997, 2001 Joerg Wunsch.
11 *
12 * This software is distributed with NO WARRANTIES, not even the implied
13 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 *
15 * Authors grant any other persons or organisations permission to use
16 * or modify this software as long as this message is kept with the software,
17 * all derivative works or modified versions.
18 *
19 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
20 *
21 * $FreeBSD$
22 */
23
24 #include <sys/param.h>
25
26 #include "opt_inet.h"
27 #include "opt_inet6.h"
28
29 #include <sys/systm.h>
30 #include <sys/kernel.h>
31 #include <sys/lock.h>
32 #include <sys/module.h>
33 #include <sys/rmlock.h>
34 #include <sys/sockio.h>
35 #include <sys/socket.h>
36 #include <sys/syslog.h>
37 #include <sys/random.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40
41 #include <sys/md5.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/netisr.h>
46 #include <net/if_types.h>
47 #include <net/route.h>
48 #include <net/vnet.h>
49 #include <netinet/in.h>
50 #include <netinet/in_var.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <net/slcompress.h>
54
55 #include <machine/stdarg.h>
56
57 #include <netinet/in_var.h>
58
59 #ifdef INET
60 #include <netinet/ip.h>
61 #include <netinet/tcp.h>
62 #endif
63
64 #ifdef INET6
65 #include <netinet6/scope6_var.h>
66 #endif
67
68 #include <netinet/if_ether.h>
69
70 #include <net/if_sppp.h>
71
72 #define IOCTL_CMD_T u_long
73 #define MAXALIVECNT 3 /* max. alive packets */
74
75 /*
76 * Interface flags that can be set in an ifconfig command.
77 *
78 * Setting link0 will make the link passive, i.e. it will be marked
79 * as being administrative openable, but won't be opened to begin
80 * with. Incoming calls will be answered, or subsequent calls with
81 * -link1 will cause the administrative open of the LCP layer.
82 *
83 * Setting link1 will cause the link to auto-dial only as packets
84 * arrive to be sent.
85 *
86 * Setting IFF_DEBUG will syslog the option negotiation and state
87 * transitions at level kern.debug. Note: all logs consistently look
88 * like
89 *
90 * <if-name><unit>: <proto-name> <additional info...>
91 *
92 * with <if-name><unit> being something like "bppp0", and <proto-name>
93 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
94 */
95
96 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
97 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
98 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */
99
100 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
101 #define PPP_UI 0x03 /* Unnumbered Information */
102 #define PPP_IP 0x0021 /* Internet Protocol */
103 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
104 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
105 #define PPP_IPX 0x002b /* Novell IPX Protocol */
106 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */
107 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */
108 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */
109 #define PPP_LCP 0xc021 /* Link Control Protocol */
110 #define PPP_PAP 0xc023 /* Password Authentication Protocol */
111 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
112 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
113 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
114
115 #define CONF_REQ 1 /* PPP configure request */
116 #define CONF_ACK 2 /* PPP configure acknowledge */
117 #define CONF_NAK 3 /* PPP configure negative ack */
118 #define CONF_REJ 4 /* PPP configure reject */
119 #define TERM_REQ 5 /* PPP terminate request */
120 #define TERM_ACK 6 /* PPP terminate acknowledge */
121 #define CODE_REJ 7 /* PPP code reject */
122 #define PROTO_REJ 8 /* PPP protocol reject */
123 #define ECHO_REQ 9 /* PPP echo request */
124 #define ECHO_REPLY 10 /* PPP echo reply */
125 #define DISC_REQ 11 /* PPP discard request */
126
127 #define LCP_OPT_MRU 1 /* maximum receive unit */
128 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
129 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
130 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
131 #define LCP_OPT_MAGIC 5 /* magic number */
132 #define LCP_OPT_RESERVED 6 /* reserved */
133 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
134 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
135
136 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
137 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
138 #define IPCP_OPT_ADDRESS 3 /* local IP address */
139
140 #define IPV6CP_OPT_IFID 1 /* interface identifier */
141 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
142
143 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */
144
145 #define PAP_REQ 1 /* PAP name/password request */
146 #define PAP_ACK 2 /* PAP acknowledge */
147 #define PAP_NAK 3 /* PAP fail */
148
149 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
150 #define CHAP_RESPONSE 2 /* CHAP challenge response */
151 #define CHAP_SUCCESS 3 /* CHAP response ok */
152 #define CHAP_FAILURE 4 /* CHAP response failed */
153
154 #define CHAP_MD5 5 /* hash algorithm - MD5 */
155
156 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
157 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
158 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
159 #define CISCO_ADDR_REQ 0 /* Cisco address request */
160 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
161 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
162
163 /* states are named and numbered according to RFC 1661 */
164 #define STATE_INITIAL 0
165 #define STATE_STARTING 1
166 #define STATE_CLOSED 2
167 #define STATE_STOPPED 3
168 #define STATE_CLOSING 4
169 #define STATE_STOPPING 5
170 #define STATE_REQ_SENT 6
171 #define STATE_ACK_RCVD 7
172 #define STATE_ACK_SENT 8
173 #define STATE_OPENED 9
174
175 static MALLOC_DEFINE(M_SPPP, "sppp", "synchronous PPP interface internals");
176
177 struct ppp_header {
178 u_char address;
179 u_char control;
180 u_short protocol;
181 } __packed;
182 #define PPP_HEADER_LEN sizeof (struct ppp_header)
183
184 struct lcp_header {
185 u_char type;
186 u_char ident;
187 u_short len;
188 } __packed;
189 #define LCP_HEADER_LEN sizeof (struct lcp_header)
190
191 struct cisco_packet {
192 u_long type;
193 u_long par1;
194 u_long par2;
195 u_short rel;
196 u_short time0;
197 u_short time1;
198 } __packed;
199 #define CISCO_PACKET_LEN sizeof (struct cisco_packet)
200
201 /*
202 * We follow the spelling and capitalization of RFC 1661 here, to make
203 * it easier comparing with the standard. Please refer to this RFC in
204 * case you can't make sense out of these abbreviation; it will also
205 * explain the semantics related to the various events and actions.
206 */
207 struct cp {
208 u_short proto; /* PPP control protocol number */
209 u_char protoidx; /* index into state table in struct sppp */
210 u_char flags;
211 #define CP_LCP 0x01 /* this is the LCP */
212 #define CP_AUTH 0x02 /* this is an authentication protocol */
213 #define CP_NCP 0x04 /* this is a NCP */
214 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
215 const char *name; /* name of this control protocol */
216 /* event handlers */
217 void (*Up)(struct sppp *sp);
218 void (*Down)(struct sppp *sp);
219 void (*Open)(struct sppp *sp);
220 void (*Close)(struct sppp *sp);
221 void (*TO)(void *sp);
222 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
223 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
224 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
225 /* actions */
226 void (*tlu)(struct sppp *sp);
227 void (*tld)(struct sppp *sp);
228 void (*tls)(struct sppp *sp);
229 void (*tlf)(struct sppp *sp);
230 void (*scr)(struct sppp *sp);
231 };
232
233 #define SPP_FMT "%s: "
234 #define SPP_ARGS(ifp) (ifp)->if_xname
235
236 #define SPPP_LOCK(sp) mtx_lock (&(sp)->mtx)
237 #define SPPP_UNLOCK(sp) mtx_unlock (&(sp)->mtx)
238 #define SPPP_LOCK_ASSERT(sp) mtx_assert (&(sp)->mtx, MA_OWNED)
239 #define SPPP_LOCK_OWNED(sp) mtx_owned (&(sp)->mtx)
240
241 #ifdef INET
242 /*
243 * The following disgusting hack gets around the problem that IP TOS
244 * can't be set yet. We want to put "interactive" traffic on a high
245 * priority queue. To decide if traffic is interactive, we check that
246 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
247 *
248 * XXX is this really still necessary? - joerg -
249 */
250 static const u_short interactive_ports[8] = {
251 0, 513, 0, 0,
252 0, 21, 0, 23,
253 };
254 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
255 #endif
256
257 /* almost every function needs these */
258 #define STDDCL \
259 struct ifnet *ifp = SP2IFP(sp); \
260 int debug = ifp->if_flags & IFF_DEBUG
261
262 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
263 const struct sockaddr *dst, struct route *ro);
264
265 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
266 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
267
268 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
269 struct mbuf *m);
270 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
271 u_char ident, u_short len, void *data);
272 /* static void sppp_cp_timeout(void *arg); */
273 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
274 int newstate);
275 static void sppp_auth_send(const struct cp *cp,
276 struct sppp *sp, unsigned int type, unsigned int id,
277 ...);
278
279 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
280 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
281 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
282 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
283 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
284
285 static void sppp_null(struct sppp *sp);
286
287 static void sppp_pp_up(struct sppp *sp);
288 static void sppp_pp_down(struct sppp *sp);
289
290 static void sppp_lcp_init(struct sppp *sp);
291 static void sppp_lcp_up(struct sppp *sp);
292 static void sppp_lcp_down(struct sppp *sp);
293 static void sppp_lcp_open(struct sppp *sp);
294 static void sppp_lcp_close(struct sppp *sp);
295 static void sppp_lcp_TO(void *sp);
296 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
297 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
298 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
299 static void sppp_lcp_tlu(struct sppp *sp);
300 static void sppp_lcp_tld(struct sppp *sp);
301 static void sppp_lcp_tls(struct sppp *sp);
302 static void sppp_lcp_tlf(struct sppp *sp);
303 static void sppp_lcp_scr(struct sppp *sp);
304 static void sppp_lcp_check_and_close(struct sppp *sp);
305 static int sppp_ncp_check(struct sppp *sp);
306
307 static void sppp_ipcp_init(struct sppp *sp);
308 static void sppp_ipcp_up(struct sppp *sp);
309 static void sppp_ipcp_down(struct sppp *sp);
310 static void sppp_ipcp_open(struct sppp *sp);
311 static void sppp_ipcp_close(struct sppp *sp);
312 static void sppp_ipcp_TO(void *sp);
313 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
314 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
315 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
316 static void sppp_ipcp_tlu(struct sppp *sp);
317 static void sppp_ipcp_tld(struct sppp *sp);
318 static void sppp_ipcp_tls(struct sppp *sp);
319 static void sppp_ipcp_tlf(struct sppp *sp);
320 static void sppp_ipcp_scr(struct sppp *sp);
321
322 static void sppp_ipv6cp_init(struct sppp *sp);
323 static void sppp_ipv6cp_up(struct sppp *sp);
324 static void sppp_ipv6cp_down(struct sppp *sp);
325 static void sppp_ipv6cp_open(struct sppp *sp);
326 static void sppp_ipv6cp_close(struct sppp *sp);
327 static void sppp_ipv6cp_TO(void *sp);
328 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
329 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
330 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
331 static void sppp_ipv6cp_tlu(struct sppp *sp);
332 static void sppp_ipv6cp_tld(struct sppp *sp);
333 static void sppp_ipv6cp_tls(struct sppp *sp);
334 static void sppp_ipv6cp_tlf(struct sppp *sp);
335 static void sppp_ipv6cp_scr(struct sppp *sp);
336
337 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
338 static void sppp_pap_init(struct sppp *sp);
339 static void sppp_pap_open(struct sppp *sp);
340 static void sppp_pap_close(struct sppp *sp);
341 static void sppp_pap_TO(void *sp);
342 static void sppp_pap_my_TO(void *sp);
343 static void sppp_pap_tlu(struct sppp *sp);
344 static void sppp_pap_tld(struct sppp *sp);
345 static void sppp_pap_scr(struct sppp *sp);
346
347 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
348 static void sppp_chap_init(struct sppp *sp);
349 static void sppp_chap_open(struct sppp *sp);
350 static void sppp_chap_close(struct sppp *sp);
351 static void sppp_chap_TO(void *sp);
352 static void sppp_chap_tlu(struct sppp *sp);
353 static void sppp_chap_tld(struct sppp *sp);
354 static void sppp_chap_scr(struct sppp *sp);
355
356 static const char *sppp_auth_type_name(u_short proto, u_char type);
357 static const char *sppp_cp_type_name(u_char type);
358 #ifdef INET
359 static const char *sppp_dotted_quad(u_long addr);
360 static const char *sppp_ipcp_opt_name(u_char opt);
361 #endif
362 #ifdef INET6
363 static const char *sppp_ipv6cp_opt_name(u_char opt);
364 #endif
365 static const char *sppp_lcp_opt_name(u_char opt);
366 static const char *sppp_phase_name(enum ppp_phase phase);
367 static const char *sppp_proto_name(u_short proto);
368 static const char *sppp_state_name(int state);
369 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
370 static int sppp_strnlen(u_char *p, int max);
371 static void sppp_keepalive(void *dummy);
372 static void sppp_phase_network(struct sppp *sp);
373 static void sppp_print_bytes(const u_char *p, u_short len);
374 static void sppp_print_string(const char *p, u_short len);
375 static void sppp_qflush(struct ifqueue *ifq);
376 #ifdef INET
377 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
378 #endif
379 #ifdef INET6
380 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
381 struct in6_addr *dst, struct in6_addr *srcmask);
382 #ifdef IPV6CP_MYIFID_DYN
383 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
384 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
385 #endif
386 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
387 #endif
388
389 /* if_start () wrapper */
390 static void sppp_ifstart (struct ifnet *ifp);
391
392 /* our control protocol descriptors */
393 static const struct cp lcp = {
394 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
395 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
396 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
397 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
398 sppp_lcp_scr
399 };
400
401 static const struct cp ipcp = {
402 PPP_IPCP, IDX_IPCP,
403 #ifdef INET /* don't run IPCP if there's no IPv4 support */
404 CP_NCP,
405 #else
406 0,
407 #endif
408 "ipcp",
409 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
410 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
411 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
412 sppp_ipcp_scr
413 };
414
415 static const struct cp ipv6cp = {
416 PPP_IPV6CP, IDX_IPV6CP,
417 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
418 CP_NCP,
419 #else
420 0,
421 #endif
422 "ipv6cp",
423 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
424 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
425 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
426 sppp_ipv6cp_scr
427 };
428
429 static const struct cp pap = {
430 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
431 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
432 sppp_pap_TO, 0, 0, 0,
433 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
434 sppp_pap_scr
435 };
436
437 static const struct cp chap = {
438 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
439 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
440 sppp_chap_TO, 0, 0, 0,
441 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
442 sppp_chap_scr
443 };
444
445 static const struct cp *cps[IDX_COUNT] = {
446 &lcp, /* IDX_LCP */
447 &ipcp, /* IDX_IPCP */
448 &ipv6cp, /* IDX_IPV6CP */
449 &pap, /* IDX_PAP */
450 &chap, /* IDX_CHAP */
451 };
452
453 static void*
sppp_alloc(u_char type,struct ifnet * ifp)454 sppp_alloc(u_char type, struct ifnet *ifp)
455 {
456 struct sppp *sp;
457
458 sp = malloc(sizeof(struct sppp), M_SPPP, M_WAITOK | M_ZERO);
459 sp->pp_ifp = ifp;
460
461 return (sp);
462 }
463
464 static void
sppp_free(void * com,u_char type)465 sppp_free(void *com, u_char type)
466 {
467
468 free(com, M_SPPP);
469 }
470
471 static int
sppp_modevent(module_t mod,int type,void * unused)472 sppp_modevent(module_t mod, int type, void *unused)
473 {
474 switch (type) {
475 case MOD_LOAD:
476 /*
477 * XXX: should probably be IFT_SPPP, but it's fairly
478 * harmless to allocate struct sppp's for non-sppp
479 * interfaces.
480 */
481
482 if_register_com_alloc(IFT_PPP, sppp_alloc, sppp_free);
483 break;
484 case MOD_UNLOAD:
485 /* if_deregister_com_alloc(IFT_PPP); */
486 return EACCES;
487 default:
488 return EOPNOTSUPP;
489 }
490 return 0;
491 }
492 static moduledata_t spppmod = {
493 "sppp",
494 sppp_modevent,
495 0
496 };
497 MODULE_VERSION(sppp, 1);
498 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
499
500 /*
501 * Exported functions, comprising our interface to the lower layer.
502 */
503
504 /*
505 * Process the received packet.
506 */
507 void
sppp_input(struct ifnet * ifp,struct mbuf * m)508 sppp_input(struct ifnet *ifp, struct mbuf *m)
509 {
510 struct ppp_header *h;
511 int isr = -1;
512 struct sppp *sp = IFP2SP(ifp);
513 int debug, do_account = 0;
514 #ifdef INET
515 int hlen, vjlen;
516 u_char *iphdr;
517 #endif
518
519 SPPP_LOCK(sp);
520 debug = ifp->if_flags & IFF_DEBUG;
521
522 if (ifp->if_flags & IFF_UP)
523 /* Count received bytes, add FCS and one flag */
524 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len + 3);
525
526 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
527 /* Too small packet, drop it. */
528 if (debug)
529 log(LOG_DEBUG,
530 SPP_FMT "input packet is too small, %d bytes\n",
531 SPP_ARGS(ifp), m->m_pkthdr.len);
532 drop:
533 m_freem (m);
534 SPPP_UNLOCK(sp);
535 drop2:
536 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
537 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
538 return;
539 }
540
541 if (sp->pp_mode == PP_FR) {
542 sppp_fr_input (sp, m);
543 SPPP_UNLOCK(sp);
544 return;
545 }
546
547 /* Get PPP header. */
548 h = mtod (m, struct ppp_header*);
549 m_adj (m, PPP_HEADER_LEN);
550
551 switch (h->address) {
552 case PPP_ALLSTATIONS:
553 if (h->control != PPP_UI)
554 goto invalid;
555 if (sp->pp_mode == IFF_CISCO) {
556 if (debug)
557 log(LOG_DEBUG,
558 SPP_FMT "PPP packet in Cisco mode "
559 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
560 SPP_ARGS(ifp),
561 h->address, h->control, ntohs(h->protocol));
562 goto drop;
563 }
564 switch (ntohs (h->protocol)) {
565 default:
566 if (debug)
567 log(LOG_DEBUG,
568 SPP_FMT "rejecting protocol "
569 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
570 SPP_ARGS(ifp),
571 h->address, h->control, ntohs(h->protocol));
572 if (sp->state[IDX_LCP] == STATE_OPENED)
573 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
574 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
575 &h->protocol);
576 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
577 goto drop;
578 case PPP_LCP:
579 sppp_cp_input(&lcp, sp, m);
580 m_freem (m);
581 SPPP_UNLOCK(sp);
582 return;
583 case PPP_PAP:
584 if (sp->pp_phase >= PHASE_AUTHENTICATE)
585 sppp_pap_input(sp, m);
586 m_freem (m);
587 SPPP_UNLOCK(sp);
588 return;
589 case PPP_CHAP:
590 if (sp->pp_phase >= PHASE_AUTHENTICATE)
591 sppp_chap_input(sp, m);
592 m_freem (m);
593 SPPP_UNLOCK(sp);
594 return;
595 #ifdef INET
596 case PPP_IPCP:
597 if (sp->pp_phase == PHASE_NETWORK)
598 sppp_cp_input(&ipcp, sp, m);
599 m_freem (m);
600 SPPP_UNLOCK(sp);
601 return;
602 case PPP_IP:
603 if (sp->state[IDX_IPCP] == STATE_OPENED) {
604 isr = NETISR_IP;
605 }
606 do_account++;
607 break;
608 case PPP_VJ_COMP:
609 if (sp->state[IDX_IPCP] == STATE_OPENED) {
610 if ((vjlen =
611 sl_uncompress_tcp_core(mtod(m, u_char *),
612 m->m_len, m->m_len,
613 TYPE_COMPRESSED_TCP,
614 sp->pp_comp,
615 &iphdr, &hlen)) <= 0) {
616 if (debug)
617 log(LOG_INFO,
618 SPP_FMT "VJ uncompress failed on compressed packet\n",
619 SPP_ARGS(ifp));
620 goto drop;
621 }
622
623 /*
624 * Trim the VJ header off the packet, and prepend
625 * the uncompressed IP header (which will usually
626 * end up in two chained mbufs since there's not
627 * enough leading space in the existing mbuf).
628 */
629 m_adj(m, vjlen);
630 M_PREPEND(m, hlen, M_NOWAIT);
631 if (m == NULL) {
632 SPPP_UNLOCK(sp);
633 goto drop2;
634 }
635 bcopy(iphdr, mtod(m, u_char *), hlen);
636 isr = NETISR_IP;
637 }
638 do_account++;
639 break;
640 case PPP_VJ_UCOMP:
641 if (sp->state[IDX_IPCP] == STATE_OPENED) {
642 if (sl_uncompress_tcp_core(mtod(m, u_char *),
643 m->m_len, m->m_len,
644 TYPE_UNCOMPRESSED_TCP,
645 sp->pp_comp,
646 &iphdr, &hlen) != 0) {
647 if (debug)
648 log(LOG_INFO,
649 SPP_FMT "VJ uncompress failed on uncompressed packet\n",
650 SPP_ARGS(ifp));
651 goto drop;
652 }
653 isr = NETISR_IP;
654 }
655 do_account++;
656 break;
657 #endif
658 #ifdef INET6
659 case PPP_IPV6CP:
660 if (sp->pp_phase == PHASE_NETWORK)
661 sppp_cp_input(&ipv6cp, sp, m);
662 m_freem (m);
663 SPPP_UNLOCK(sp);
664 return;
665
666 case PPP_IPV6:
667 if (sp->state[IDX_IPV6CP] == STATE_OPENED)
668 isr = NETISR_IPV6;
669 do_account++;
670 break;
671 #endif
672 }
673 break;
674 case CISCO_MULTICAST:
675 case CISCO_UNICAST:
676 /* Don't check the control field here (RFC 1547). */
677 if (sp->pp_mode != IFF_CISCO) {
678 if (debug)
679 log(LOG_DEBUG,
680 SPP_FMT "Cisco packet in PPP mode "
681 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
682 SPP_ARGS(ifp),
683 h->address, h->control, ntohs(h->protocol));
684 goto drop;
685 }
686 switch (ntohs (h->protocol)) {
687 default:
688 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
689 goto invalid;
690 case CISCO_KEEPALIVE:
691 sppp_cisco_input (sp, m);
692 m_freem (m);
693 SPPP_UNLOCK(sp);
694 return;
695 #ifdef INET
696 case ETHERTYPE_IP:
697 isr = NETISR_IP;
698 do_account++;
699 break;
700 #endif
701 #ifdef INET6
702 case ETHERTYPE_IPV6:
703 isr = NETISR_IPV6;
704 do_account++;
705 break;
706 #endif
707 }
708 break;
709 default: /* Invalid PPP packet. */
710 invalid:
711 if (debug)
712 log(LOG_DEBUG,
713 SPP_FMT "invalid input packet "
714 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
715 SPP_ARGS(ifp),
716 h->address, h->control, ntohs(h->protocol));
717 goto drop;
718 }
719
720 if (! (ifp->if_flags & IFF_UP) || isr == -1)
721 goto drop;
722
723 SPPP_UNLOCK(sp);
724 M_SETFIB(m, ifp->if_fib);
725 /* Check queue. */
726 if (netisr_queue(isr, m)) { /* (0) on success. */
727 if (debug)
728 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
729 SPP_ARGS(ifp));
730 goto drop2;
731 }
732
733 if (do_account)
734 /*
735 * Do only account for network packets, not for control
736 * packets. This is used by some subsystems to detect
737 * idle lines.
738 */
739 sp->pp_last_recv = time_uptime;
740 }
741
742 static void
sppp_ifstart_sched(void * dummy)743 sppp_ifstart_sched(void *dummy)
744 {
745 struct sppp *sp = dummy;
746
747 sp->if_start(SP2IFP(sp));
748 }
749
750 /* if_start () wrapper function. We use it to schedule real if_start () for
751 * execution. We can't call it directly
752 */
753 static void
sppp_ifstart(struct ifnet * ifp)754 sppp_ifstart(struct ifnet *ifp)
755 {
756 struct sppp *sp = IFP2SP(ifp);
757
758 if (SPPP_LOCK_OWNED(sp)) {
759 if (callout_pending(&sp->ifstart_callout))
760 return;
761 callout_reset(&sp->ifstart_callout, 1, sppp_ifstart_sched,
762 (void *)sp);
763 } else {
764 sp->if_start(ifp);
765 }
766 }
767
768 /*
769 * Enqueue transmit packet.
770 */
771 static int
sppp_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * ro)772 sppp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
773 struct route *ro)
774 {
775 struct sppp *sp = IFP2SP(ifp);
776 struct ppp_header *h;
777 struct ifqueue *ifq = NULL;
778 int error, rv = 0;
779 #ifdef INET
780 int ipproto = PPP_IP;
781 #endif
782 int debug = ifp->if_flags & IFF_DEBUG;
783
784 SPPP_LOCK(sp);
785
786 if (!(ifp->if_flags & IFF_UP) ||
787 (!(ifp->if_flags & IFF_AUTO) &&
788 !(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
789 #ifdef INET6
790 drop:
791 #endif
792 m_freem (m);
793 SPPP_UNLOCK(sp);
794 return (ENETDOWN);
795 }
796
797 if ((ifp->if_flags & IFF_AUTO) &&
798 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
799 #ifdef INET6
800 /*
801 * XXX
802 *
803 * Hack to prevent the initialization-time generated
804 * IPv6 multicast packet to erroneously cause a
805 * dialout event in case IPv6 has been
806 * administratively disabled on that interface.
807 */
808 if (dst->sa_family == AF_INET6 &&
809 !(sp->confflags & CONF_ENABLE_IPV6))
810 goto drop;
811 #endif
812 /*
813 * Interface is not yet running, but auto-dial. Need
814 * to start LCP for it.
815 */
816 ifp->if_drv_flags |= IFF_DRV_RUNNING;
817 lcp.Open(sp);
818 }
819
820 #ifdef INET
821 if (dst->sa_family == AF_INET) {
822 /* XXX Check mbuf length here? */
823 struct ip *ip = mtod (m, struct ip*);
824 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
825
826 /*
827 * When using dynamic local IP address assignment by using
828 * 0.0.0.0 as a local address, the first TCP session will
829 * not connect because the local TCP checksum is computed
830 * using 0.0.0.0 which will later become our real IP address
831 * so the TCP checksum computed at the remote end will
832 * become invalid. So we
833 * - don't let packets with src ip addr 0 thru
834 * - we flag TCP packets with src ip 0 as an error
835 */
836
837 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
838 {
839 m_freem(m);
840 SPPP_UNLOCK(sp);
841 if(ip->ip_p == IPPROTO_TCP)
842 return(EADDRNOTAVAIL);
843 else
844 return(0);
845 }
846
847 /*
848 * Put low delay, telnet, rlogin and ftp control packets
849 * in front of the queue or let ALTQ take care.
850 */
851 if (ALTQ_IS_ENABLED(&ifp->if_snd))
852 ;
853 else if (_IF_QFULL(&sp->pp_fastq))
854 ;
855 else if (ip->ip_tos & IPTOS_LOWDELAY)
856 ifq = &sp->pp_fastq;
857 else if (m->m_len < sizeof *ip + sizeof *tcp)
858 ;
859 else if (ip->ip_p != IPPROTO_TCP)
860 ;
861 else if (INTERACTIVE (ntohs (tcp->th_sport)))
862 ifq = &sp->pp_fastq;
863 else if (INTERACTIVE (ntohs (tcp->th_dport)))
864 ifq = &sp->pp_fastq;
865
866 /*
867 * Do IP Header compression
868 */
869 if (sp->pp_mode != IFF_CISCO && sp->pp_mode != PP_FR &&
870 (sp->ipcp.flags & IPCP_VJ) && ip->ip_p == IPPROTO_TCP)
871 switch (sl_compress_tcp(m, ip, sp->pp_comp,
872 sp->ipcp.compress_cid)) {
873 case TYPE_COMPRESSED_TCP:
874 ipproto = PPP_VJ_COMP;
875 break;
876 case TYPE_UNCOMPRESSED_TCP:
877 ipproto = PPP_VJ_UCOMP;
878 break;
879 case TYPE_IP:
880 ipproto = PPP_IP;
881 break;
882 default:
883 m_freem(m);
884 SPPP_UNLOCK(sp);
885 return (EINVAL);
886 }
887 }
888 #endif
889
890 #ifdef INET6
891 if (dst->sa_family == AF_INET6) {
892 /* XXX do something tricky here? */
893 }
894 #endif
895
896 if (sp->pp_mode == PP_FR) {
897 /* Add frame relay header. */
898 m = sppp_fr_header (sp, m, dst->sa_family);
899 if (! m)
900 goto nobufs;
901 goto out;
902 }
903
904 /*
905 * Prepend general data packet PPP header. For now, IP only.
906 */
907 M_PREPEND (m, PPP_HEADER_LEN, M_NOWAIT);
908 if (! m) {
909 nobufs: if (debug)
910 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
911 SPP_ARGS(ifp));
912 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
913 SPPP_UNLOCK(sp);
914 return (ENOBUFS);
915 }
916 /*
917 * May want to check size of packet
918 * (albeit due to the implementation it's always enough)
919 */
920 h = mtod (m, struct ppp_header*);
921 if (sp->pp_mode == IFF_CISCO) {
922 h->address = CISCO_UNICAST; /* unicast address */
923 h->control = 0;
924 } else {
925 h->address = PPP_ALLSTATIONS; /* broadcast address */
926 h->control = PPP_UI; /* Unnumbered Info */
927 }
928
929 switch (dst->sa_family) {
930 #ifdef INET
931 case AF_INET: /* Internet Protocol */
932 if (sp->pp_mode == IFF_CISCO)
933 h->protocol = htons (ETHERTYPE_IP);
934 else {
935 /*
936 * Don't choke with an ENETDOWN early. It's
937 * possible that we just started dialing out,
938 * so don't drop the packet immediately. If
939 * we notice that we run out of buffer space
940 * below, we will however remember that we are
941 * not ready to carry IP packets, and return
942 * ENETDOWN, as opposed to ENOBUFS.
943 */
944 h->protocol = htons(ipproto);
945 if (sp->state[IDX_IPCP] != STATE_OPENED)
946 rv = ENETDOWN;
947 }
948 break;
949 #endif
950 #ifdef INET6
951 case AF_INET6: /* Internet Protocol */
952 if (sp->pp_mode == IFF_CISCO)
953 h->protocol = htons (ETHERTYPE_IPV6);
954 else {
955 /*
956 * Don't choke with an ENETDOWN early. It's
957 * possible that we just started dialing out,
958 * so don't drop the packet immediately. If
959 * we notice that we run out of buffer space
960 * below, we will however remember that we are
961 * not ready to carry IP packets, and return
962 * ENETDOWN, as opposed to ENOBUFS.
963 */
964 h->protocol = htons(PPP_IPV6);
965 if (sp->state[IDX_IPV6CP] != STATE_OPENED)
966 rv = ENETDOWN;
967 }
968 break;
969 #endif
970 default:
971 m_freem (m);
972 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
973 SPPP_UNLOCK(sp);
974 return (EAFNOSUPPORT);
975 }
976
977 /*
978 * Queue message on interface, and start output if interface
979 * not yet active.
980 */
981 out:
982 if (ifq != NULL)
983 error = !(IF_HANDOFF_ADJ(ifq, m, ifp, 3));
984 else
985 IFQ_HANDOFF_ADJ(ifp, m, 3, error);
986 if (error) {
987 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
988 SPPP_UNLOCK(sp);
989 return (rv? rv: ENOBUFS);
990 }
991 SPPP_UNLOCK(sp);
992 /*
993 * Unlike in sppp_input(), we can always bump the timestamp
994 * here since sppp_output() is only called on behalf of
995 * network-layer traffic; control-layer traffic is handled
996 * by sppp_cp_send().
997 */
998 sp->pp_last_sent = time_uptime;
999 return (0);
1000 }
1001
1002 void
sppp_attach(struct ifnet * ifp)1003 sppp_attach(struct ifnet *ifp)
1004 {
1005 struct sppp *sp = IFP2SP(ifp);
1006
1007 /* Initialize mtx lock */
1008 mtx_init(&sp->mtx, "sppp", MTX_NETWORK_LOCK, MTX_DEF | MTX_RECURSE);
1009
1010 /* Initialize keepalive handler. */
1011 callout_init(&sp->keepalive_callout, 1);
1012 callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
1013 (void *)sp);
1014
1015 ifp->if_mtu = PP_MTU;
1016 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1017 ifp->if_output = sppp_output;
1018 #if 0
1019 sp->pp_flags = PP_KEEPALIVE;
1020 #endif
1021 ifp->if_snd.ifq_maxlen = 32;
1022 sp->pp_fastq.ifq_maxlen = 32;
1023 sp->pp_cpq.ifq_maxlen = 20;
1024 sp->pp_loopcnt = 0;
1025 sp->pp_alivecnt = 0;
1026 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1027 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1028 sp->pp_phase = PHASE_DEAD;
1029 sp->pp_up = sppp_pp_up;
1030 sp->pp_down = sppp_pp_down;
1031 if(!mtx_initialized(&sp->pp_cpq.ifq_mtx))
1032 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", NULL, MTX_DEF);
1033 if(!mtx_initialized(&sp->pp_fastq.ifq_mtx))
1034 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", NULL, MTX_DEF);
1035 sp->pp_last_recv = sp->pp_last_sent = time_uptime;
1036 sp->confflags = 0;
1037 #ifdef INET
1038 sp->confflags |= CONF_ENABLE_VJ;
1039 #endif
1040 #ifdef INET6
1041 sp->confflags |= CONF_ENABLE_IPV6;
1042 #endif
1043 callout_init(&sp->ifstart_callout, 1);
1044 sp->if_start = ifp->if_start;
1045 ifp->if_start = sppp_ifstart;
1046 sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1047 sl_compress_init(sp->pp_comp, -1);
1048 sppp_lcp_init(sp);
1049 sppp_ipcp_init(sp);
1050 sppp_ipv6cp_init(sp);
1051 sppp_pap_init(sp);
1052 sppp_chap_init(sp);
1053 }
1054
1055 void
sppp_detach(struct ifnet * ifp)1056 sppp_detach(struct ifnet *ifp)
1057 {
1058 struct sppp *sp = IFP2SP(ifp);
1059 int i;
1060
1061 KASSERT(mtx_initialized(&sp->mtx), ("sppp mutex is not initialized"));
1062
1063 /* Stop keepalive handler. */
1064 callout_drain(&sp->keepalive_callout);
1065
1066 for (i = 0; i < IDX_COUNT; i++) {
1067 callout_drain(&sp->ch[i]);
1068 }
1069 callout_drain(&sp->pap_my_to_ch);
1070
1071 mtx_destroy(&sp->pp_cpq.ifq_mtx);
1072 mtx_destroy(&sp->pp_fastq.ifq_mtx);
1073 mtx_destroy(&sp->mtx);
1074 }
1075
1076 /*
1077 * Flush the interface output queue.
1078 */
1079 static void
sppp_flush_unlocked(struct ifnet * ifp)1080 sppp_flush_unlocked(struct ifnet *ifp)
1081 {
1082 struct sppp *sp = IFP2SP(ifp);
1083
1084 sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1085 sppp_qflush (&sp->pp_fastq);
1086 sppp_qflush (&sp->pp_cpq);
1087 }
1088
1089 void
sppp_flush(struct ifnet * ifp)1090 sppp_flush(struct ifnet *ifp)
1091 {
1092 struct sppp *sp = IFP2SP(ifp);
1093
1094 SPPP_LOCK(sp);
1095 sppp_flush_unlocked (ifp);
1096 SPPP_UNLOCK(sp);
1097 }
1098
1099 /*
1100 * Check if the output queue is empty.
1101 */
1102 int
sppp_isempty(struct ifnet * ifp)1103 sppp_isempty(struct ifnet *ifp)
1104 {
1105 struct sppp *sp = IFP2SP(ifp);
1106 int empty;
1107
1108 SPPP_LOCK(sp);
1109 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1110 !SP2IFP(sp)->if_snd.ifq_head;
1111 SPPP_UNLOCK(sp);
1112 return (empty);
1113 }
1114
1115 /*
1116 * Get next packet to send.
1117 */
1118 struct mbuf *
sppp_dequeue(struct ifnet * ifp)1119 sppp_dequeue(struct ifnet *ifp)
1120 {
1121 struct sppp *sp = IFP2SP(ifp);
1122 struct mbuf *m;
1123
1124 SPPP_LOCK(sp);
1125 /*
1126 * Process only the control protocol queue until we have at
1127 * least one NCP open.
1128 *
1129 * Do always serve all three queues in Cisco mode.
1130 */
1131 IF_DEQUEUE(&sp->pp_cpq, m);
1132 if (m == NULL &&
1133 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1134 sp->pp_mode == PP_FR)) {
1135 IF_DEQUEUE(&sp->pp_fastq, m);
1136 if (m == NULL)
1137 IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1138 }
1139 SPPP_UNLOCK(sp);
1140 return m;
1141 }
1142
1143 /*
1144 * Pick the next packet, do not remove it from the queue.
1145 */
1146 struct mbuf *
sppp_pick(struct ifnet * ifp)1147 sppp_pick(struct ifnet *ifp)
1148 {
1149 struct sppp *sp = IFP2SP(ifp);
1150 struct mbuf *m;
1151
1152 SPPP_LOCK(sp);
1153
1154 m = sp->pp_cpq.ifq_head;
1155 if (m == NULL &&
1156 (sp->pp_phase == PHASE_NETWORK ||
1157 sp->pp_mode == IFF_CISCO ||
1158 sp->pp_mode == PP_FR))
1159 if ((m = sp->pp_fastq.ifq_head) == NULL)
1160 m = SP2IFP(sp)->if_snd.ifq_head;
1161 SPPP_UNLOCK(sp);
1162 return (m);
1163 }
1164
1165 /*
1166 * Process an ioctl request. Called on low priority level.
1167 */
1168 int
sppp_ioctl(struct ifnet * ifp,IOCTL_CMD_T cmd,void * data)1169 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1170 {
1171 struct ifreq *ifr = (struct ifreq*) data;
1172 struct sppp *sp = IFP2SP(ifp);
1173 int rv, going_up, going_down, newmode;
1174
1175 SPPP_LOCK(sp);
1176 rv = 0;
1177 switch (cmd) {
1178 case SIOCAIFADDR:
1179 break;
1180
1181 case SIOCSIFADDR:
1182 /* set the interface "up" when assigning an IP address */
1183 ifp->if_flags |= IFF_UP;
1184 /* FALLTHROUGH */
1185
1186 case SIOCSIFFLAGS:
1187 going_up = ifp->if_flags & IFF_UP &&
1188 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1189 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1190 ifp->if_drv_flags & IFF_DRV_RUNNING;
1191
1192 newmode = ifp->if_flags & IFF_PASSIVE;
1193 if (!newmode)
1194 newmode = ifp->if_flags & IFF_AUTO;
1195 if (!newmode)
1196 newmode = ifp->if_flags & IFF_CISCO;
1197 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1198 ifp->if_flags |= newmode;
1199
1200 if (!newmode)
1201 newmode = sp->pp_flags & PP_FR;
1202
1203 if (newmode != sp->pp_mode) {
1204 going_down = 1;
1205 if (!going_up)
1206 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1207 }
1208
1209 if (going_down) {
1210 if (sp->pp_mode != IFF_CISCO &&
1211 sp->pp_mode != PP_FR)
1212 lcp.Close(sp);
1213 else if (sp->pp_tlf)
1214 (sp->pp_tlf)(sp);
1215 sppp_flush_unlocked(ifp);
1216 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1217 sp->pp_mode = newmode;
1218 }
1219
1220 if (going_up) {
1221 if (sp->pp_mode != IFF_CISCO &&
1222 sp->pp_mode != PP_FR)
1223 lcp.Close(sp);
1224 sp->pp_mode = newmode;
1225 if (sp->pp_mode == 0) {
1226 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1227 lcp.Open(sp);
1228 }
1229 if ((sp->pp_mode == IFF_CISCO) ||
1230 (sp->pp_mode == PP_FR)) {
1231 if (sp->pp_tls)
1232 (sp->pp_tls)(sp);
1233 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1234 }
1235 }
1236
1237 break;
1238
1239 #ifdef SIOCSIFMTU
1240 #ifndef ifr_mtu
1241 #define ifr_mtu ifr_metric
1242 #endif
1243 case SIOCSIFMTU:
1244 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1245 return (EINVAL);
1246 ifp->if_mtu = ifr->ifr_mtu;
1247 break;
1248 #endif
1249 #ifdef SLIOCSETMTU
1250 case SLIOCSETMTU:
1251 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1252 return (EINVAL);
1253 ifp->if_mtu = *(short*)data;
1254 break;
1255 #endif
1256 #ifdef SIOCGIFMTU
1257 case SIOCGIFMTU:
1258 ifr->ifr_mtu = ifp->if_mtu;
1259 break;
1260 #endif
1261 #ifdef SLIOCGETMTU
1262 case SLIOCGETMTU:
1263 *(short*)data = ifp->if_mtu;
1264 break;
1265 #endif
1266 case SIOCADDMULTI:
1267 case SIOCDELMULTI:
1268 break;
1269
1270 case SIOCGIFGENERIC:
1271 case SIOCSIFGENERIC:
1272 rv = sppp_params(sp, cmd, data);
1273 break;
1274
1275 default:
1276 rv = ENOTTY;
1277 }
1278 SPPP_UNLOCK(sp);
1279 return rv;
1280 }
1281
1282 /*
1283 * Cisco framing implementation.
1284 */
1285
1286 /*
1287 * Handle incoming Cisco keepalive protocol packets.
1288 */
1289 static void
sppp_cisco_input(struct sppp * sp,struct mbuf * m)1290 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1291 {
1292 STDDCL;
1293 struct cisco_packet *h;
1294 u_long me, mymask;
1295
1296 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1297 if (debug)
1298 log(LOG_DEBUG,
1299 SPP_FMT "cisco invalid packet length: %d bytes\n",
1300 SPP_ARGS(ifp), m->m_pkthdr.len);
1301 return;
1302 }
1303 h = mtod (m, struct cisco_packet*);
1304 if (debug)
1305 log(LOG_DEBUG,
1306 SPP_FMT "cisco input: %d bytes "
1307 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1308 SPP_ARGS(ifp), m->m_pkthdr.len,
1309 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1310 (u_int)h->time0, (u_int)h->time1);
1311 switch (ntohl (h->type)) {
1312 default:
1313 if (debug)
1314 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1315 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1316 break;
1317 case CISCO_ADDR_REPLY:
1318 /* Reply on address request, ignore */
1319 break;
1320 case CISCO_KEEPALIVE_REQ:
1321 sp->pp_alivecnt = 0;
1322 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1323 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1324 /* Local and remote sequence numbers are equal.
1325 * Probably, the line is in loopback mode. */
1326 if (sp->pp_loopcnt >= MAXALIVECNT) {
1327 printf (SPP_FMT "loopback\n",
1328 SPP_ARGS(ifp));
1329 sp->pp_loopcnt = 0;
1330 if (ifp->if_flags & IFF_UP) {
1331 if_down (ifp);
1332 sppp_qflush (&sp->pp_cpq);
1333 }
1334 }
1335 ++sp->pp_loopcnt;
1336
1337 /* Generate new local sequence number */
1338 sp->pp_seq[IDX_LCP] = random();
1339 break;
1340 }
1341 sp->pp_loopcnt = 0;
1342 if (! (ifp->if_flags & IFF_UP) &&
1343 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1344 if_up(ifp);
1345 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1346 }
1347 break;
1348 case CISCO_ADDR_REQ:
1349 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1350 if (me != 0L)
1351 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1352 break;
1353 }
1354 }
1355
1356 /*
1357 * Send Cisco keepalive packet.
1358 */
1359 static void
sppp_cisco_send(struct sppp * sp,int type,long par1,long par2)1360 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1361 {
1362 STDDCL;
1363 struct ppp_header *h;
1364 struct cisco_packet *ch;
1365 struct mbuf *m;
1366 struct timeval tv;
1367
1368 getmicrouptime(&tv);
1369
1370 MGETHDR (m, M_NOWAIT, MT_DATA);
1371 if (! m)
1372 return;
1373 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1374 m->m_pkthdr.rcvif = 0;
1375
1376 h = mtod (m, struct ppp_header*);
1377 h->address = CISCO_MULTICAST;
1378 h->control = 0;
1379 h->protocol = htons (CISCO_KEEPALIVE);
1380
1381 ch = (struct cisco_packet*) (h + 1);
1382 ch->type = htonl (type);
1383 ch->par1 = htonl (par1);
1384 ch->par2 = htonl (par2);
1385 ch->rel = -1;
1386
1387 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1388 ch->time1 = htons ((u_short) tv.tv_sec);
1389
1390 if (debug)
1391 log(LOG_DEBUG,
1392 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1393 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1394 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1395
1396 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1397 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1398 }
1399
1400 /*
1401 * PPP protocol implementation.
1402 */
1403
1404 /*
1405 * Send PPP control protocol packet.
1406 */
1407 static void
sppp_cp_send(struct sppp * sp,u_short proto,u_char type,u_char ident,u_short len,void * data)1408 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1409 u_char ident, u_short len, void *data)
1410 {
1411 STDDCL;
1412 struct ppp_header *h;
1413 struct lcp_header *lh;
1414 struct mbuf *m;
1415
1416 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1417 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1418 MGETHDR (m, M_NOWAIT, MT_DATA);
1419 if (! m)
1420 return;
1421 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1422 m->m_pkthdr.rcvif = 0;
1423
1424 h = mtod (m, struct ppp_header*);
1425 h->address = PPP_ALLSTATIONS; /* broadcast address */
1426 h->control = PPP_UI; /* Unnumbered Info */
1427 h->protocol = htons (proto); /* Link Control Protocol */
1428
1429 lh = (struct lcp_header*) (h + 1);
1430 lh->type = type;
1431 lh->ident = ident;
1432 lh->len = htons (LCP_HEADER_LEN + len);
1433 if (len)
1434 bcopy (data, lh+1, len);
1435
1436 if (debug) {
1437 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1438 SPP_ARGS(ifp),
1439 sppp_proto_name(proto),
1440 sppp_cp_type_name (lh->type), lh->ident,
1441 ntohs (lh->len));
1442 sppp_print_bytes ((u_char*) (lh+1), len);
1443 log(-1, ">\n");
1444 }
1445 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1446 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1447 }
1448
1449 /*
1450 * Handle incoming PPP control protocol packets.
1451 */
1452 static void
sppp_cp_input(const struct cp * cp,struct sppp * sp,struct mbuf * m)1453 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1454 {
1455 STDDCL;
1456 struct lcp_header *h;
1457 int len = m->m_pkthdr.len;
1458 int rv;
1459 u_char *p;
1460
1461 if (len < 4) {
1462 if (debug)
1463 log(LOG_DEBUG,
1464 SPP_FMT "%s invalid packet length: %d bytes\n",
1465 SPP_ARGS(ifp), cp->name, len);
1466 return;
1467 }
1468 h = mtod (m, struct lcp_header*);
1469 if (debug) {
1470 log(LOG_DEBUG,
1471 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1472 SPP_ARGS(ifp), cp->name,
1473 sppp_state_name(sp->state[cp->protoidx]),
1474 sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1475 sppp_print_bytes ((u_char*) (h+1), len-4);
1476 log(-1, ">\n");
1477 }
1478 if (len > ntohs (h->len))
1479 len = ntohs (h->len);
1480 p = (u_char *)(h + 1);
1481 switch (h->type) {
1482 case CONF_REQ:
1483 if (len < 4) {
1484 if (debug)
1485 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1486 SPP_ARGS(ifp), cp->name,
1487 len);
1488 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1489 break;
1490 }
1491 /* handle states where RCR doesn't get a SCA/SCN */
1492 switch (sp->state[cp->protoidx]) {
1493 case STATE_CLOSING:
1494 case STATE_STOPPING:
1495 return;
1496 case STATE_CLOSED:
1497 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1498 0, 0);
1499 return;
1500 }
1501 rv = (cp->RCR)(sp, h, len);
1502 switch (sp->state[cp->protoidx]) {
1503 case STATE_OPENED:
1504 (cp->tld)(sp);
1505 (cp->scr)(sp);
1506 /* FALLTHROUGH */
1507 case STATE_ACK_SENT:
1508 case STATE_REQ_SENT:
1509 /*
1510 * sppp_cp_change_state() have the side effect of
1511 * restarting the timeouts. We want to avoid that
1512 * if the state don't change, otherwise we won't
1513 * ever timeout and resend a configuration request
1514 * that got lost.
1515 */
1516 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1517 STATE_REQ_SENT))
1518 break;
1519 sppp_cp_change_state(cp, sp, rv?
1520 STATE_ACK_SENT: STATE_REQ_SENT);
1521 break;
1522 case STATE_STOPPED:
1523 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1524 (cp->scr)(sp);
1525 sppp_cp_change_state(cp, sp, rv?
1526 STATE_ACK_SENT: STATE_REQ_SENT);
1527 break;
1528 case STATE_ACK_RCVD:
1529 if (rv) {
1530 sppp_cp_change_state(cp, sp, STATE_OPENED);
1531 if (debug)
1532 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1533 SPP_ARGS(ifp),
1534 cp->name);
1535 (cp->tlu)(sp);
1536 } else
1537 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1538 break;
1539 default:
1540 printf(SPP_FMT "%s illegal %s in state %s\n",
1541 SPP_ARGS(ifp), cp->name,
1542 sppp_cp_type_name(h->type),
1543 sppp_state_name(sp->state[cp->protoidx]));
1544 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1545 }
1546 break;
1547 case CONF_ACK:
1548 if (h->ident != sp->confid[cp->protoidx]) {
1549 if (debug)
1550 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1551 SPP_ARGS(ifp), cp->name,
1552 h->ident, sp->confid[cp->protoidx]);
1553 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1554 break;
1555 }
1556 switch (sp->state[cp->protoidx]) {
1557 case STATE_CLOSED:
1558 case STATE_STOPPED:
1559 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1560 break;
1561 case STATE_CLOSING:
1562 case STATE_STOPPING:
1563 break;
1564 case STATE_REQ_SENT:
1565 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1566 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1567 break;
1568 case STATE_OPENED:
1569 (cp->tld)(sp);
1570 /* FALLTHROUGH */
1571 case STATE_ACK_RCVD:
1572 (cp->scr)(sp);
1573 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1574 break;
1575 case STATE_ACK_SENT:
1576 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1577 sppp_cp_change_state(cp, sp, STATE_OPENED);
1578 if (debug)
1579 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1580 SPP_ARGS(ifp), cp->name);
1581 (cp->tlu)(sp);
1582 break;
1583 default:
1584 printf(SPP_FMT "%s illegal %s in state %s\n",
1585 SPP_ARGS(ifp), cp->name,
1586 sppp_cp_type_name(h->type),
1587 sppp_state_name(sp->state[cp->protoidx]));
1588 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1589 }
1590 break;
1591 case CONF_NAK:
1592 case CONF_REJ:
1593 if (h->ident != sp->confid[cp->protoidx]) {
1594 if (debug)
1595 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1596 SPP_ARGS(ifp), cp->name,
1597 h->ident, sp->confid[cp->protoidx]);
1598 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1599 break;
1600 }
1601 if (h->type == CONF_NAK)
1602 (cp->RCN_nak)(sp, h, len);
1603 else /* CONF_REJ */
1604 (cp->RCN_rej)(sp, h, len);
1605
1606 switch (sp->state[cp->protoidx]) {
1607 case STATE_CLOSED:
1608 case STATE_STOPPED:
1609 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1610 break;
1611 case STATE_REQ_SENT:
1612 case STATE_ACK_SENT:
1613 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1614 /*
1615 * Slow things down a bit if we think we might be
1616 * in loopback. Depend on the timeout to send the
1617 * next configuration request.
1618 */
1619 if (sp->pp_loopcnt)
1620 break;
1621 (cp->scr)(sp);
1622 break;
1623 case STATE_OPENED:
1624 (cp->tld)(sp);
1625 /* FALLTHROUGH */
1626 case STATE_ACK_RCVD:
1627 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1628 (cp->scr)(sp);
1629 break;
1630 case STATE_CLOSING:
1631 case STATE_STOPPING:
1632 break;
1633 default:
1634 printf(SPP_FMT "%s illegal %s in state %s\n",
1635 SPP_ARGS(ifp), cp->name,
1636 sppp_cp_type_name(h->type),
1637 sppp_state_name(sp->state[cp->protoidx]));
1638 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1639 }
1640 break;
1641
1642 case TERM_REQ:
1643 switch (sp->state[cp->protoidx]) {
1644 case STATE_ACK_RCVD:
1645 case STATE_ACK_SENT:
1646 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1647 /* FALLTHROUGH */
1648 case STATE_CLOSED:
1649 case STATE_STOPPED:
1650 case STATE_CLOSING:
1651 case STATE_STOPPING:
1652 case STATE_REQ_SENT:
1653 sta:
1654 /* Send Terminate-Ack packet. */
1655 if (debug)
1656 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1657 SPP_ARGS(ifp), cp->name);
1658 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1659 break;
1660 case STATE_OPENED:
1661 (cp->tld)(sp);
1662 sp->rst_counter[cp->protoidx] = 0;
1663 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1664 goto sta;
1665 break;
1666 default:
1667 printf(SPP_FMT "%s illegal %s in state %s\n",
1668 SPP_ARGS(ifp), cp->name,
1669 sppp_cp_type_name(h->type),
1670 sppp_state_name(sp->state[cp->protoidx]));
1671 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1672 }
1673 break;
1674 case TERM_ACK:
1675 switch (sp->state[cp->protoidx]) {
1676 case STATE_CLOSED:
1677 case STATE_STOPPED:
1678 case STATE_REQ_SENT:
1679 case STATE_ACK_SENT:
1680 break;
1681 case STATE_CLOSING:
1682 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1683 (cp->tlf)(sp);
1684 break;
1685 case STATE_STOPPING:
1686 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1687 (cp->tlf)(sp);
1688 break;
1689 case STATE_ACK_RCVD:
1690 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1691 break;
1692 case STATE_OPENED:
1693 (cp->tld)(sp);
1694 (cp->scr)(sp);
1695 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1696 break;
1697 default:
1698 printf(SPP_FMT "%s illegal %s in state %s\n",
1699 SPP_ARGS(ifp), cp->name,
1700 sppp_cp_type_name(h->type),
1701 sppp_state_name(sp->state[cp->protoidx]));
1702 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1703 }
1704 break;
1705 case CODE_REJ:
1706 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1707 log(LOG_INFO,
1708 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1709 "danger will robinson\n",
1710 SPP_ARGS(ifp), cp->name,
1711 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1712 switch (sp->state[cp->protoidx]) {
1713 case STATE_CLOSED:
1714 case STATE_STOPPED:
1715 case STATE_REQ_SENT:
1716 case STATE_ACK_SENT:
1717 case STATE_CLOSING:
1718 case STATE_STOPPING:
1719 case STATE_OPENED:
1720 break;
1721 case STATE_ACK_RCVD:
1722 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1723 break;
1724 default:
1725 printf(SPP_FMT "%s illegal %s in state %s\n",
1726 SPP_ARGS(ifp), cp->name,
1727 sppp_cp_type_name(h->type),
1728 sppp_state_name(sp->state[cp->protoidx]));
1729 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1730 }
1731 break;
1732 case PROTO_REJ:
1733 {
1734 int catastrophic;
1735 const struct cp *upper;
1736 int i;
1737 u_int16_t proto;
1738
1739 catastrophic = 0;
1740 upper = NULL;
1741 proto = ntohs(*((u_int16_t *)p));
1742 for (i = 0; i < IDX_COUNT; i++) {
1743 if (cps[i]->proto == proto) {
1744 upper = cps[i];
1745 break;
1746 }
1747 }
1748 if (upper == NULL)
1749 catastrophic++;
1750
1751 if (catastrophic || debug)
1752 log(catastrophic? LOG_INFO: LOG_DEBUG,
1753 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1754 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1755 sppp_cp_type_name(h->type), proto,
1756 upper ? upper->name : "unknown",
1757 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1758
1759 /*
1760 * if we got RXJ+ against conf-req, the peer does not implement
1761 * this particular protocol type. terminate the protocol.
1762 */
1763 if (upper && !catastrophic) {
1764 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1765 upper->Close(sp);
1766 break;
1767 }
1768 }
1769
1770 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1771 switch (sp->state[cp->protoidx]) {
1772 case STATE_CLOSED:
1773 case STATE_STOPPED:
1774 case STATE_REQ_SENT:
1775 case STATE_ACK_SENT:
1776 case STATE_CLOSING:
1777 case STATE_STOPPING:
1778 case STATE_OPENED:
1779 break;
1780 case STATE_ACK_RCVD:
1781 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1782 break;
1783 default:
1784 printf(SPP_FMT "%s illegal %s in state %s\n",
1785 SPP_ARGS(ifp), cp->name,
1786 sppp_cp_type_name(h->type),
1787 sppp_state_name(sp->state[cp->protoidx]));
1788 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1789 }
1790 break;
1791 }
1792 case DISC_REQ:
1793 if (cp->proto != PPP_LCP)
1794 goto illegal;
1795 /* Discard the packet. */
1796 break;
1797 case ECHO_REQ:
1798 if (cp->proto != PPP_LCP)
1799 goto illegal;
1800 if (sp->state[cp->protoidx] != STATE_OPENED) {
1801 if (debug)
1802 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1803 SPP_ARGS(ifp));
1804 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1805 break;
1806 }
1807 if (len < 8) {
1808 if (debug)
1809 log(-1, SPP_FMT "invalid lcp echo request "
1810 "packet length: %d bytes\n",
1811 SPP_ARGS(ifp), len);
1812 break;
1813 }
1814 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1815 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1816 /* Line loopback mode detected. */
1817 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1818 sp->pp_loopcnt = MAXALIVECNT * 5;
1819 if_down (ifp);
1820 sppp_qflush (&sp->pp_cpq);
1821
1822 /* Shut down the PPP link. */
1823 /* XXX */
1824 lcp.Down(sp);
1825 lcp.Up(sp);
1826 break;
1827 }
1828 *(long*)(h+1) = htonl (sp->lcp.magic);
1829 if (debug)
1830 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1831 SPP_ARGS(ifp));
1832 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1833 break;
1834 case ECHO_REPLY:
1835 if (cp->proto != PPP_LCP)
1836 goto illegal;
1837 if (h->ident != sp->lcp.echoid) {
1838 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1839 break;
1840 }
1841 if (len < 8) {
1842 if (debug)
1843 log(-1, SPP_FMT "lcp invalid echo reply "
1844 "packet length: %d bytes\n",
1845 SPP_ARGS(ifp), len);
1846 break;
1847 }
1848 if (debug)
1849 log(-1, SPP_FMT "lcp got echo rep\n",
1850 SPP_ARGS(ifp));
1851 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1852 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1853 sp->pp_alivecnt = 0;
1854 break;
1855 default:
1856 /* Unknown packet type -- send Code-Reject packet. */
1857 illegal:
1858 if (debug)
1859 log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1860 SPP_ARGS(ifp), cp->name, h->type);
1861 sppp_cp_send(sp, cp->proto, CODE_REJ,
1862 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1863 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1864 }
1865 }
1866
1867 /*
1868 * The generic part of all Up/Down/Open/Close/TO event handlers.
1869 * Basically, the state transition handling in the automaton.
1870 */
1871 static void
sppp_up_event(const struct cp * cp,struct sppp * sp)1872 sppp_up_event(const struct cp *cp, struct sppp *sp)
1873 {
1874 STDDCL;
1875
1876 if (debug)
1877 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1878 SPP_ARGS(ifp), cp->name,
1879 sppp_state_name(sp->state[cp->protoidx]));
1880
1881 switch (sp->state[cp->protoidx]) {
1882 case STATE_INITIAL:
1883 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1884 break;
1885 case STATE_STARTING:
1886 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1887 (cp->scr)(sp);
1888 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1889 break;
1890 default:
1891 printf(SPP_FMT "%s illegal up in state %s\n",
1892 SPP_ARGS(ifp), cp->name,
1893 sppp_state_name(sp->state[cp->protoidx]));
1894 }
1895 }
1896
1897 static void
sppp_down_event(const struct cp * cp,struct sppp * sp)1898 sppp_down_event(const struct cp *cp, struct sppp *sp)
1899 {
1900 STDDCL;
1901
1902 if (debug)
1903 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1904 SPP_ARGS(ifp), cp->name,
1905 sppp_state_name(sp->state[cp->protoidx]));
1906
1907 switch (sp->state[cp->protoidx]) {
1908 case STATE_CLOSED:
1909 case STATE_CLOSING:
1910 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1911 break;
1912 case STATE_STOPPED:
1913 sppp_cp_change_state(cp, sp, STATE_STARTING);
1914 (cp->tls)(sp);
1915 break;
1916 case STATE_STOPPING:
1917 case STATE_REQ_SENT:
1918 case STATE_ACK_RCVD:
1919 case STATE_ACK_SENT:
1920 sppp_cp_change_state(cp, sp, STATE_STARTING);
1921 break;
1922 case STATE_OPENED:
1923 (cp->tld)(sp);
1924 sppp_cp_change_state(cp, sp, STATE_STARTING);
1925 break;
1926 default:
1927 printf(SPP_FMT "%s illegal down in state %s\n",
1928 SPP_ARGS(ifp), cp->name,
1929 sppp_state_name(sp->state[cp->protoidx]));
1930 }
1931 }
1932
1933 static void
sppp_open_event(const struct cp * cp,struct sppp * sp)1934 sppp_open_event(const struct cp *cp, struct sppp *sp)
1935 {
1936 STDDCL;
1937
1938 if (debug)
1939 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1940 SPP_ARGS(ifp), cp->name,
1941 sppp_state_name(sp->state[cp->protoidx]));
1942
1943 switch (sp->state[cp->protoidx]) {
1944 case STATE_INITIAL:
1945 sppp_cp_change_state(cp, sp, STATE_STARTING);
1946 (cp->tls)(sp);
1947 break;
1948 case STATE_STARTING:
1949 break;
1950 case STATE_CLOSED:
1951 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1952 (cp->scr)(sp);
1953 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1954 break;
1955 case STATE_STOPPED:
1956 /*
1957 * Try escaping stopped state. This seems to bite
1958 * people occasionally, in particular for IPCP,
1959 * presumably following previous IPCP negotiation
1960 * aborts. Somehow, we must have missed a Down event
1961 * which would have caused a transition into starting
1962 * state, so as a bandaid we force the Down event now.
1963 * This effectively implements (something like the)
1964 * `restart' option mentioned in the state transition
1965 * table of RFC 1661.
1966 */
1967 sppp_cp_change_state(cp, sp, STATE_STARTING);
1968 (cp->tls)(sp);
1969 break;
1970 case STATE_STOPPING:
1971 case STATE_REQ_SENT:
1972 case STATE_ACK_RCVD:
1973 case STATE_ACK_SENT:
1974 case STATE_OPENED:
1975 break;
1976 case STATE_CLOSING:
1977 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1978 break;
1979 }
1980 }
1981
1982 static void
sppp_close_event(const struct cp * cp,struct sppp * sp)1983 sppp_close_event(const struct cp *cp, struct sppp *sp)
1984 {
1985 STDDCL;
1986
1987 if (debug)
1988 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1989 SPP_ARGS(ifp), cp->name,
1990 sppp_state_name(sp->state[cp->protoidx]));
1991
1992 switch (sp->state[cp->protoidx]) {
1993 case STATE_INITIAL:
1994 case STATE_CLOSED:
1995 case STATE_CLOSING:
1996 break;
1997 case STATE_STARTING:
1998 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1999 (cp->tlf)(sp);
2000 break;
2001 case STATE_STOPPED:
2002 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2003 break;
2004 case STATE_STOPPING:
2005 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2006 break;
2007 case STATE_OPENED:
2008 (cp->tld)(sp);
2009 /* FALLTHROUGH */
2010 case STATE_REQ_SENT:
2011 case STATE_ACK_RCVD:
2012 case STATE_ACK_SENT:
2013 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2014 sppp_cp_send(sp, cp->proto, TERM_REQ,
2015 ++sp->pp_seq[cp->protoidx], 0, 0);
2016 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2017 break;
2018 }
2019 }
2020
2021 static void
sppp_to_event(const struct cp * cp,struct sppp * sp)2022 sppp_to_event(const struct cp *cp, struct sppp *sp)
2023 {
2024 STDDCL;
2025
2026 SPPP_LOCK(sp);
2027 if (debug)
2028 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2029 SPP_ARGS(ifp), cp->name,
2030 sppp_state_name(sp->state[cp->protoidx]),
2031 sp->rst_counter[cp->protoidx]);
2032
2033 if (--sp->rst_counter[cp->protoidx] < 0)
2034 /* TO- event */
2035 switch (sp->state[cp->protoidx]) {
2036 case STATE_CLOSING:
2037 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2038 (cp->tlf)(sp);
2039 break;
2040 case STATE_STOPPING:
2041 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2042 (cp->tlf)(sp);
2043 break;
2044 case STATE_REQ_SENT:
2045 case STATE_ACK_RCVD:
2046 case STATE_ACK_SENT:
2047 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2048 (cp->tlf)(sp);
2049 break;
2050 }
2051 else
2052 /* TO+ event */
2053 switch (sp->state[cp->protoidx]) {
2054 case STATE_CLOSING:
2055 case STATE_STOPPING:
2056 sppp_cp_send(sp, cp->proto, TERM_REQ,
2057 ++sp->pp_seq[cp->protoidx], 0, 0);
2058 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2059 cp->TO, (void *)sp);
2060 break;
2061 case STATE_REQ_SENT:
2062 case STATE_ACK_RCVD:
2063 (cp->scr)(sp);
2064 /* sppp_cp_change_state() will restart the timer */
2065 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2066 break;
2067 case STATE_ACK_SENT:
2068 (cp->scr)(sp);
2069 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2070 cp->TO, (void *)sp);
2071 break;
2072 }
2073
2074 SPPP_UNLOCK(sp);
2075 }
2076
2077 /*
2078 * Change the state of a control protocol in the state automaton.
2079 * Takes care of starting/stopping the restart timer.
2080 */
2081 static void
sppp_cp_change_state(const struct cp * cp,struct sppp * sp,int newstate)2082 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2083 {
2084 sp->state[cp->protoidx] = newstate;
2085
2086 callout_stop (&sp->ch[cp->protoidx]);
2087
2088 switch (newstate) {
2089 case STATE_INITIAL:
2090 case STATE_STARTING:
2091 case STATE_CLOSED:
2092 case STATE_STOPPED:
2093 case STATE_OPENED:
2094 break;
2095 case STATE_CLOSING:
2096 case STATE_STOPPING:
2097 case STATE_REQ_SENT:
2098 case STATE_ACK_RCVD:
2099 case STATE_ACK_SENT:
2100 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2101 cp->TO, (void *)sp);
2102 break;
2103 }
2104 }
2105
2106 /*
2107 *--------------------------------------------------------------------------*
2108 * *
2109 * The LCP implementation. *
2110 * *
2111 *--------------------------------------------------------------------------*
2112 */
2113 static void
sppp_pp_up(struct sppp * sp)2114 sppp_pp_up(struct sppp *sp)
2115 {
2116 SPPP_LOCK(sp);
2117 lcp.Up(sp);
2118 SPPP_UNLOCK(sp);
2119 }
2120
2121 static void
sppp_pp_down(struct sppp * sp)2122 sppp_pp_down(struct sppp *sp)
2123 {
2124 SPPP_LOCK(sp);
2125 lcp.Down(sp);
2126 SPPP_UNLOCK(sp);
2127 }
2128
2129 static void
sppp_lcp_init(struct sppp * sp)2130 sppp_lcp_init(struct sppp *sp)
2131 {
2132 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2133 sp->lcp.magic = 0;
2134 sp->state[IDX_LCP] = STATE_INITIAL;
2135 sp->fail_counter[IDX_LCP] = 0;
2136 sp->pp_seq[IDX_LCP] = 0;
2137 sp->pp_rseq[IDX_LCP] = 0;
2138 sp->lcp.protos = 0;
2139 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2140
2141 /* Note that these values are relevant for all control protocols */
2142 sp->lcp.timeout = 3 * hz;
2143 sp->lcp.max_terminate = 2;
2144 sp->lcp.max_configure = 10;
2145 sp->lcp.max_failure = 10;
2146 callout_init(&sp->ch[IDX_LCP], 1);
2147 }
2148
2149 static void
sppp_lcp_up(struct sppp * sp)2150 sppp_lcp_up(struct sppp *sp)
2151 {
2152 STDDCL;
2153
2154 sp->pp_alivecnt = 0;
2155 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2156 sp->lcp.magic = 0;
2157 sp->lcp.protos = 0;
2158 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2159 /*
2160 * If we are authenticator, negotiate LCP_AUTH
2161 */
2162 if (sp->hisauth.proto != 0)
2163 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2164 else
2165 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2166 sp->pp_flags &= ~PP_NEEDAUTH;
2167 /*
2168 * If this interface is passive or dial-on-demand, and we are
2169 * still in Initial state, it means we've got an incoming
2170 * call. Activate the interface.
2171 */
2172 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2173 if (debug)
2174 log(LOG_DEBUG,
2175 SPP_FMT "Up event", SPP_ARGS(ifp));
2176 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2177 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2178 if (debug)
2179 log(-1, "(incoming call)\n");
2180 sp->pp_flags |= PP_CALLIN;
2181 lcp.Open(sp);
2182 } else if (debug)
2183 log(-1, "\n");
2184 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2185 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2186 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2187 lcp.Open(sp);
2188 }
2189
2190 sppp_up_event(&lcp, sp);
2191 }
2192
2193 static void
sppp_lcp_down(struct sppp * sp)2194 sppp_lcp_down(struct sppp *sp)
2195 {
2196 STDDCL;
2197
2198 sppp_down_event(&lcp, sp);
2199
2200 /*
2201 * If this is neither a dial-on-demand nor a passive
2202 * interface, simulate an ``ifconfig down'' action, so the
2203 * administrator can force a redial by another ``ifconfig
2204 * up''. XXX For leased line operation, should we immediately
2205 * try to reopen the connection here?
2206 */
2207 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2208 log(LOG_INFO,
2209 SPP_FMT "Down event, taking interface down.\n",
2210 SPP_ARGS(ifp));
2211 if_down(ifp);
2212 } else {
2213 if (debug)
2214 log(LOG_DEBUG,
2215 SPP_FMT "Down event (carrier loss)\n",
2216 SPP_ARGS(ifp));
2217 sp->pp_flags &= ~PP_CALLIN;
2218 if (sp->state[IDX_LCP] != STATE_INITIAL)
2219 lcp.Close(sp);
2220 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2221 }
2222 }
2223
2224 static void
sppp_lcp_open(struct sppp * sp)2225 sppp_lcp_open(struct sppp *sp)
2226 {
2227 sppp_open_event(&lcp, sp);
2228 }
2229
2230 static void
sppp_lcp_close(struct sppp * sp)2231 sppp_lcp_close(struct sppp *sp)
2232 {
2233 sppp_close_event(&lcp, sp);
2234 }
2235
2236 static void
sppp_lcp_TO(void * cookie)2237 sppp_lcp_TO(void *cookie)
2238 {
2239 sppp_to_event(&lcp, (struct sppp *)cookie);
2240 }
2241
2242 /*
2243 * Analyze a configure request. Return true if it was agreeable, and
2244 * caused action sca, false if it has been rejected or nak'ed, and
2245 * caused action scn. (The return value is used to make the state
2246 * transition decision in the state automaton.)
2247 */
2248 static int
sppp_lcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2249 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2250 {
2251 STDDCL;
2252 u_char *buf, *r, *p;
2253 int origlen, rlen;
2254 u_long nmagic;
2255 u_short authproto;
2256
2257 len -= 4;
2258 origlen = len;
2259 buf = r = malloc (len, M_TEMP, M_NOWAIT);
2260 if (! buf)
2261 return (0);
2262
2263 if (debug)
2264 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2265 SPP_ARGS(ifp));
2266
2267 /* pass 1: check for things that need to be rejected */
2268 p = (void*) (h+1);
2269 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2270 len-=p[1], p+=p[1]) {
2271 if (debug)
2272 log(-1, " %s ", sppp_lcp_opt_name(*p));
2273 switch (*p) {
2274 case LCP_OPT_MAGIC:
2275 /* Magic number. */
2276 if (len >= 6 && p[1] == 6)
2277 continue;
2278 if (debug)
2279 log(-1, "[invalid] ");
2280 break;
2281 case LCP_OPT_ASYNC_MAP:
2282 /* Async control character map. */
2283 if (len >= 6 && p[1] == 6)
2284 continue;
2285 if (debug)
2286 log(-1, "[invalid] ");
2287 break;
2288 case LCP_OPT_MRU:
2289 /* Maximum receive unit. */
2290 if (len >= 4 && p[1] == 4)
2291 continue;
2292 if (debug)
2293 log(-1, "[invalid] ");
2294 break;
2295 case LCP_OPT_AUTH_PROTO:
2296 if (len < 4) {
2297 if (debug)
2298 log(-1, "[invalid] ");
2299 break;
2300 }
2301 authproto = (p[2] << 8) + p[3];
2302 if (authproto == PPP_CHAP && p[1] != 5) {
2303 if (debug)
2304 log(-1, "[invalid chap len] ");
2305 break;
2306 }
2307 if (sp->myauth.proto == 0) {
2308 /* we are not configured to do auth */
2309 if (debug)
2310 log(-1, "[not configured] ");
2311 break;
2312 }
2313 /*
2314 * Remote want us to authenticate, remember this,
2315 * so we stay in PHASE_AUTHENTICATE after LCP got
2316 * up.
2317 */
2318 sp->pp_flags |= PP_NEEDAUTH;
2319 continue;
2320 default:
2321 /* Others not supported. */
2322 if (debug)
2323 log(-1, "[rej] ");
2324 break;
2325 }
2326 /* Add the option to rejected list. */
2327 bcopy (p, r, p[1]);
2328 r += p[1];
2329 rlen += p[1];
2330 }
2331 if (rlen) {
2332 if (debug)
2333 log(-1, " send conf-rej\n");
2334 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2335 return 0;
2336 } else if (debug)
2337 log(-1, "\n");
2338
2339 /*
2340 * pass 2: check for option values that are unacceptable and
2341 * thus require to be nak'ed.
2342 */
2343 if (debug)
2344 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2345 SPP_ARGS(ifp));
2346
2347 p = (void*) (h+1);
2348 len = origlen;
2349 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2350 len-=p[1], p+=p[1]) {
2351 if (debug)
2352 log(-1, " %s ", sppp_lcp_opt_name(*p));
2353 switch (*p) {
2354 case LCP_OPT_MAGIC:
2355 /* Magic number -- extract. */
2356 nmagic = (u_long)p[2] << 24 |
2357 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2358 if (nmagic != sp->lcp.magic) {
2359 sp->pp_loopcnt = 0;
2360 if (debug)
2361 log(-1, "0x%lx ", nmagic);
2362 continue;
2363 }
2364 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2365 log(-1, "[glitch] ");
2366 ++sp->pp_loopcnt;
2367 /*
2368 * We negate our magic here, and NAK it. If
2369 * we see it later in an NAK packet, we
2370 * suggest a new one.
2371 */
2372 nmagic = ~sp->lcp.magic;
2373 /* Gonna NAK it. */
2374 p[2] = nmagic >> 24;
2375 p[3] = nmagic >> 16;
2376 p[4] = nmagic >> 8;
2377 p[5] = nmagic;
2378 break;
2379
2380 case LCP_OPT_ASYNC_MAP:
2381 /*
2382 * Async control character map -- just ignore it.
2383 *
2384 * Quote from RFC 1662, chapter 6:
2385 * To enable this functionality, synchronous PPP
2386 * implementations MUST always respond to the
2387 * Async-Control-Character-Map Configuration
2388 * Option with the LCP Configure-Ack. However,
2389 * acceptance of the Configuration Option does
2390 * not imply that the synchronous implementation
2391 * will do any ACCM mapping. Instead, all such
2392 * octet mapping will be performed by the
2393 * asynchronous-to-synchronous converter.
2394 */
2395 continue;
2396
2397 case LCP_OPT_MRU:
2398 /*
2399 * Maximum receive unit. Always agreeable,
2400 * but ignored by now.
2401 */
2402 sp->lcp.their_mru = p[2] * 256 + p[3];
2403 if (debug)
2404 log(-1, "%lu ", sp->lcp.their_mru);
2405 continue;
2406
2407 case LCP_OPT_AUTH_PROTO:
2408 authproto = (p[2] << 8) + p[3];
2409 if (sp->myauth.proto != authproto) {
2410 /* not agreed, nak */
2411 if (debug)
2412 log(-1, "[mine %s != his %s] ",
2413 sppp_proto_name(sp->hisauth.proto),
2414 sppp_proto_name(authproto));
2415 p[2] = sp->myauth.proto >> 8;
2416 p[3] = sp->myauth.proto;
2417 break;
2418 }
2419 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2420 if (debug)
2421 log(-1, "[chap not MD5] ");
2422 p[4] = CHAP_MD5;
2423 break;
2424 }
2425 continue;
2426 }
2427 /* Add the option to nak'ed list. */
2428 bcopy (p, r, p[1]);
2429 r += p[1];
2430 rlen += p[1];
2431 }
2432 if (rlen) {
2433 /*
2434 * Local and remote magics equal -- loopback?
2435 */
2436 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2437 if (sp->pp_loopcnt == MAXALIVECNT*5)
2438 printf (SPP_FMT "loopback\n",
2439 SPP_ARGS(ifp));
2440 if (ifp->if_flags & IFF_UP) {
2441 if_down(ifp);
2442 sppp_qflush(&sp->pp_cpq);
2443 /* XXX ? */
2444 lcp.Down(sp);
2445 lcp.Up(sp);
2446 }
2447 } else if (!sp->pp_loopcnt &&
2448 ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2449 if (debug)
2450 log(-1, " max_failure (%d) exceeded, "
2451 "send conf-rej\n",
2452 sp->lcp.max_failure);
2453 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2454 } else {
2455 if (debug)
2456 log(-1, " send conf-nak\n");
2457 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2458 }
2459 } else {
2460 if (debug)
2461 log(-1, " send conf-ack\n");
2462 sp->fail_counter[IDX_LCP] = 0;
2463 sp->pp_loopcnt = 0;
2464 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2465 h->ident, origlen, h+1);
2466 }
2467
2468 free (buf, M_TEMP);
2469 return (rlen == 0);
2470 }
2471
2472 /*
2473 * Analyze the LCP Configure-Reject option list, and adjust our
2474 * negotiation.
2475 */
2476 static void
sppp_lcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)2477 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2478 {
2479 STDDCL;
2480 u_char *buf, *p;
2481
2482 len -= 4;
2483 buf = malloc (len, M_TEMP, M_NOWAIT);
2484 if (!buf)
2485 return;
2486
2487 if (debug)
2488 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2489 SPP_ARGS(ifp));
2490
2491 p = (void*) (h+1);
2492 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2493 len -= p[1], p += p[1]) {
2494 if (debug)
2495 log(-1, " %s ", sppp_lcp_opt_name(*p));
2496 switch (*p) {
2497 case LCP_OPT_MAGIC:
2498 /* Magic number -- can't use it, use 0 */
2499 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2500 sp->lcp.magic = 0;
2501 break;
2502 case LCP_OPT_MRU:
2503 /*
2504 * Should not be rejected anyway, since we only
2505 * negotiate a MRU if explicitly requested by
2506 * peer.
2507 */
2508 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2509 break;
2510 case LCP_OPT_AUTH_PROTO:
2511 /*
2512 * Peer doesn't want to authenticate himself,
2513 * deny unless this is a dialout call, and
2514 * AUTHFLAG_NOCALLOUT is set.
2515 */
2516 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2517 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2518 if (debug)
2519 log(-1, "[don't insist on auth "
2520 "for callout]");
2521 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2522 break;
2523 }
2524 if (debug)
2525 log(-1, "[access denied]\n");
2526 lcp.Close(sp);
2527 break;
2528 }
2529 }
2530 if (debug)
2531 log(-1, "\n");
2532 free (buf, M_TEMP);
2533 return;
2534 }
2535
2536 /*
2537 * Analyze the LCP Configure-NAK option list, and adjust our
2538 * negotiation.
2539 */
2540 static void
sppp_lcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)2541 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2542 {
2543 STDDCL;
2544 u_char *buf, *p;
2545 u_long magic;
2546
2547 len -= 4;
2548 buf = malloc (len, M_TEMP, M_NOWAIT);
2549 if (!buf)
2550 return;
2551
2552 if (debug)
2553 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2554 SPP_ARGS(ifp));
2555
2556 p = (void*) (h+1);
2557 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2558 len -= p[1], p += p[1]) {
2559 if (debug)
2560 log(-1, " %s ", sppp_lcp_opt_name(*p));
2561 switch (*p) {
2562 case LCP_OPT_MAGIC:
2563 /* Magic number -- renegotiate */
2564 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2565 len >= 6 && p[1] == 6) {
2566 magic = (u_long)p[2] << 24 |
2567 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2568 /*
2569 * If the remote magic is our negated one,
2570 * this looks like a loopback problem.
2571 * Suggest a new magic to make sure.
2572 */
2573 if (magic == ~sp->lcp.magic) {
2574 if (debug)
2575 log(-1, "magic glitch ");
2576 sp->lcp.magic = random();
2577 } else {
2578 sp->lcp.magic = magic;
2579 if (debug)
2580 log(-1, "%lu ", magic);
2581 }
2582 }
2583 break;
2584 case LCP_OPT_MRU:
2585 /*
2586 * Peer wants to advise us to negotiate an MRU.
2587 * Agree on it if it's reasonable, or use
2588 * default otherwise.
2589 */
2590 if (len >= 4 && p[1] == 4) {
2591 u_int mru = p[2] * 256 + p[3];
2592 if (debug)
2593 log(-1, "%d ", mru);
2594 if (mru < PP_MTU || mru > PP_MAX_MRU)
2595 mru = PP_MTU;
2596 sp->lcp.mru = mru;
2597 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2598 }
2599 break;
2600 case LCP_OPT_AUTH_PROTO:
2601 /*
2602 * Peer doesn't like our authentication method,
2603 * deny.
2604 */
2605 if (debug)
2606 log(-1, "[access denied]\n");
2607 lcp.Close(sp);
2608 break;
2609 }
2610 }
2611 if (debug)
2612 log(-1, "\n");
2613 free (buf, M_TEMP);
2614 return;
2615 }
2616
2617 static void
sppp_lcp_tlu(struct sppp * sp)2618 sppp_lcp_tlu(struct sppp *sp)
2619 {
2620 STDDCL;
2621 int i;
2622 u_long mask;
2623
2624 /* XXX ? */
2625 if (! (ifp->if_flags & IFF_UP) &&
2626 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2627 /* Coming out of loopback mode. */
2628 if_up(ifp);
2629 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2630 }
2631
2632 for (i = 0; i < IDX_COUNT; i++)
2633 if ((cps[i])->flags & CP_QUAL)
2634 (cps[i])->Open(sp);
2635
2636 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2637 (sp->pp_flags & PP_NEEDAUTH) != 0)
2638 sp->pp_phase = PHASE_AUTHENTICATE;
2639 else
2640 sp->pp_phase = PHASE_NETWORK;
2641
2642 if (debug)
2643 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2644 sppp_phase_name(sp->pp_phase));
2645
2646 /*
2647 * Open all authentication protocols. This is even required
2648 * if we already proceeded to network phase, since it might be
2649 * that remote wants us to authenticate, so we might have to
2650 * send a PAP request. Undesired authentication protocols
2651 * don't do anything when they get an Open event.
2652 */
2653 for (i = 0; i < IDX_COUNT; i++)
2654 if ((cps[i])->flags & CP_AUTH)
2655 (cps[i])->Open(sp);
2656
2657 if (sp->pp_phase == PHASE_NETWORK) {
2658 /* Notify all NCPs. */
2659 for (i = 0; i < IDX_COUNT; i++)
2660 if (((cps[i])->flags & CP_NCP) &&
2661 /*
2662 * XXX
2663 * Hack to administratively disable IPv6 if
2664 * not desired. Perhaps we should have another
2665 * flag for this, but right now, we can make
2666 * all struct cp's read/only.
2667 */
2668 (cps[i] != &ipv6cp ||
2669 (sp->confflags & CONF_ENABLE_IPV6)))
2670 (cps[i])->Open(sp);
2671 }
2672
2673 /* Send Up events to all started protos. */
2674 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2675 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2676 (cps[i])->Up(sp);
2677
2678 /* notify low-level driver of state change */
2679 if (sp->pp_chg)
2680 sp->pp_chg(sp, (int)sp->pp_phase);
2681
2682 if (sp->pp_phase == PHASE_NETWORK)
2683 /* if no NCP is starting, close down */
2684 sppp_lcp_check_and_close(sp);
2685 }
2686
2687 static void
sppp_lcp_tld(struct sppp * sp)2688 sppp_lcp_tld(struct sppp *sp)
2689 {
2690 STDDCL;
2691 int i;
2692 u_long mask;
2693
2694 sp->pp_phase = PHASE_TERMINATE;
2695
2696 if (debug)
2697 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2698 sppp_phase_name(sp->pp_phase));
2699
2700 /*
2701 * Take upper layers down. We send the Down event first and
2702 * the Close second to prevent the upper layers from sending
2703 * ``a flurry of terminate-request packets'', as the RFC
2704 * describes it.
2705 */
2706 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2707 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2708 (cps[i])->Down(sp);
2709 (cps[i])->Close(sp);
2710 }
2711 }
2712
2713 static void
sppp_lcp_tls(struct sppp * sp)2714 sppp_lcp_tls(struct sppp *sp)
2715 {
2716 STDDCL;
2717
2718 sp->pp_phase = PHASE_ESTABLISH;
2719
2720 if (debug)
2721 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2722 sppp_phase_name(sp->pp_phase));
2723
2724 /* Notify lower layer if desired. */
2725 if (sp->pp_tls)
2726 (sp->pp_tls)(sp);
2727 else
2728 (sp->pp_up)(sp);
2729 }
2730
2731 static void
sppp_lcp_tlf(struct sppp * sp)2732 sppp_lcp_tlf(struct sppp *sp)
2733 {
2734 STDDCL;
2735
2736 sp->pp_phase = PHASE_DEAD;
2737 if (debug)
2738 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2739 sppp_phase_name(sp->pp_phase));
2740
2741 /* Notify lower layer if desired. */
2742 if (sp->pp_tlf)
2743 (sp->pp_tlf)(sp);
2744 else
2745 (sp->pp_down)(sp);
2746 }
2747
2748 static void
sppp_lcp_scr(struct sppp * sp)2749 sppp_lcp_scr(struct sppp *sp)
2750 {
2751 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2752 int i = 0;
2753 u_short authproto;
2754
2755 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2756 if (! sp->lcp.magic)
2757 sp->lcp.magic = random();
2758 opt[i++] = LCP_OPT_MAGIC;
2759 opt[i++] = 6;
2760 opt[i++] = sp->lcp.magic >> 24;
2761 opt[i++] = sp->lcp.magic >> 16;
2762 opt[i++] = sp->lcp.magic >> 8;
2763 opt[i++] = sp->lcp.magic;
2764 }
2765
2766 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2767 opt[i++] = LCP_OPT_MRU;
2768 opt[i++] = 4;
2769 opt[i++] = sp->lcp.mru >> 8;
2770 opt[i++] = sp->lcp.mru;
2771 }
2772
2773 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2774 authproto = sp->hisauth.proto;
2775 opt[i++] = LCP_OPT_AUTH_PROTO;
2776 opt[i++] = authproto == PPP_CHAP? 5: 4;
2777 opt[i++] = authproto >> 8;
2778 opt[i++] = authproto;
2779 if (authproto == PPP_CHAP)
2780 opt[i++] = CHAP_MD5;
2781 }
2782
2783 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2784 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2785 }
2786
2787 /*
2788 * Check the open NCPs, return true if at least one NCP is open.
2789 */
2790 static int
sppp_ncp_check(struct sppp * sp)2791 sppp_ncp_check(struct sppp *sp)
2792 {
2793 int i, mask;
2794
2795 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2796 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2797 return 1;
2798 return 0;
2799 }
2800
2801 /*
2802 * Re-check the open NCPs and see if we should terminate the link.
2803 * Called by the NCPs during their tlf action handling.
2804 */
2805 static void
sppp_lcp_check_and_close(struct sppp * sp)2806 sppp_lcp_check_and_close(struct sppp *sp)
2807 {
2808
2809 if (sp->pp_phase < PHASE_NETWORK)
2810 /* don't bother, we are already going down */
2811 return;
2812
2813 if (sppp_ncp_check(sp))
2814 return;
2815
2816 lcp.Close(sp);
2817 }
2818
2819 /*
2820 *--------------------------------------------------------------------------*
2821 * *
2822 * The IPCP implementation. *
2823 * *
2824 *--------------------------------------------------------------------------*
2825 */
2826
2827 #ifdef INET
2828 static void
sppp_ipcp_init(struct sppp * sp)2829 sppp_ipcp_init(struct sppp *sp)
2830 {
2831 sp->ipcp.opts = 0;
2832 sp->ipcp.flags = 0;
2833 sp->state[IDX_IPCP] = STATE_INITIAL;
2834 sp->fail_counter[IDX_IPCP] = 0;
2835 sp->pp_seq[IDX_IPCP] = 0;
2836 sp->pp_rseq[IDX_IPCP] = 0;
2837 callout_init(&sp->ch[IDX_IPCP], 1);
2838 }
2839
2840 static void
sppp_ipcp_up(struct sppp * sp)2841 sppp_ipcp_up(struct sppp *sp)
2842 {
2843 sppp_up_event(&ipcp, sp);
2844 }
2845
2846 static void
sppp_ipcp_down(struct sppp * sp)2847 sppp_ipcp_down(struct sppp *sp)
2848 {
2849 sppp_down_event(&ipcp, sp);
2850 }
2851
2852 static void
sppp_ipcp_open(struct sppp * sp)2853 sppp_ipcp_open(struct sppp *sp)
2854 {
2855 STDDCL;
2856 u_long myaddr, hisaddr;
2857
2858 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2859 IPCP_MYADDR_DYN | IPCP_VJ);
2860 sp->ipcp.opts = 0;
2861
2862 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2863 /*
2864 * If we don't have his address, this probably means our
2865 * interface doesn't want to talk IP at all. (This could
2866 * be the case if somebody wants to speak only IPX, for
2867 * example.) Don't open IPCP in this case.
2868 */
2869 if (hisaddr == 0L) {
2870 /* XXX this message should go away */
2871 if (debug)
2872 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2873 SPP_ARGS(ifp));
2874 return;
2875 }
2876 if (myaddr == 0L) {
2877 /*
2878 * I don't have an assigned address, so i need to
2879 * negotiate my address.
2880 */
2881 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2882 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2883 } else
2884 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2885 if (sp->confflags & CONF_ENABLE_VJ) {
2886 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2887 sp->ipcp.max_state = MAX_STATES - 1;
2888 sp->ipcp.compress_cid = 1;
2889 }
2890 sppp_open_event(&ipcp, sp);
2891 }
2892
2893 static void
sppp_ipcp_close(struct sppp * sp)2894 sppp_ipcp_close(struct sppp *sp)
2895 {
2896 sppp_close_event(&ipcp, sp);
2897 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2898 /*
2899 * My address was dynamic, clear it again.
2900 */
2901 sppp_set_ip_addr(sp, 0L);
2902 }
2903
2904 static void
sppp_ipcp_TO(void * cookie)2905 sppp_ipcp_TO(void *cookie)
2906 {
2907 sppp_to_event(&ipcp, (struct sppp *)cookie);
2908 }
2909
2910 /*
2911 * Analyze a configure request. Return true if it was agreeable, and
2912 * caused action sca, false if it has been rejected or nak'ed, and
2913 * caused action scn. (The return value is used to make the state
2914 * transition decision in the state automaton.)
2915 */
2916 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2917 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2918 {
2919 u_char *buf, *r, *p;
2920 struct ifnet *ifp = SP2IFP(sp);
2921 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2922 u_long hisaddr, desiredaddr;
2923 int gotmyaddr = 0;
2924 int desiredcomp;
2925
2926 len -= 4;
2927 origlen = len;
2928 /*
2929 * Make sure to allocate a buf that can at least hold a
2930 * conf-nak with an `address' option. We might need it below.
2931 */
2932 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2933 if (! buf)
2934 return (0);
2935
2936 /* pass 1: see if we can recognize them */
2937 if (debug)
2938 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2939 SPP_ARGS(ifp));
2940 p = (void*) (h+1);
2941 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2942 len-=p[1], p+=p[1]) {
2943 if (debug)
2944 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2945 switch (*p) {
2946 case IPCP_OPT_COMPRESSION:
2947 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2948 /* VJ compression administratively disabled */
2949 if (debug)
2950 log(-1, "[locally disabled] ");
2951 break;
2952 }
2953 /*
2954 * In theory, we should only conf-rej an
2955 * option that is shorter than RFC 1618
2956 * requires (i.e. < 4), and should conf-nak
2957 * anything else that is not VJ. However,
2958 * since our algorithm always uses the
2959 * original option to NAK it with new values,
2960 * things would become more complicated. In
2961 * practice, the only commonly implemented IP
2962 * compression option is VJ anyway, so the
2963 * difference is negligible.
2964 */
2965 if (len >= 6 && p[1] == 6) {
2966 /*
2967 * correctly formed compression option
2968 * that could be VJ compression
2969 */
2970 continue;
2971 }
2972 if (debug)
2973 log(-1,
2974 "optlen %d [invalid/unsupported] ",
2975 p[1]);
2976 break;
2977 case IPCP_OPT_ADDRESS:
2978 if (len >= 6 && p[1] == 6) {
2979 /* correctly formed address option */
2980 continue;
2981 }
2982 if (debug)
2983 log(-1, "[invalid] ");
2984 break;
2985 default:
2986 /* Others not supported. */
2987 if (debug)
2988 log(-1, "[rej] ");
2989 break;
2990 }
2991 /* Add the option to rejected list. */
2992 bcopy (p, r, p[1]);
2993 r += p[1];
2994 rlen += p[1];
2995 }
2996 if (rlen) {
2997 if (debug)
2998 log(-1, " send conf-rej\n");
2999 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3000 return 0;
3001 } else if (debug)
3002 log(-1, "\n");
3003
3004 /* pass 2: parse option values */
3005 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3006 if (debug)
3007 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3008 SPP_ARGS(ifp));
3009 p = (void*) (h+1);
3010 len = origlen;
3011 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3012 len-=p[1], p+=p[1]) {
3013 if (debug)
3014 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3015 switch (*p) {
3016 case IPCP_OPT_COMPRESSION:
3017 desiredcomp = p[2] << 8 | p[3];
3018 /* We only support VJ */
3019 if (desiredcomp == IPCP_COMP_VJ) {
3020 if (debug)
3021 log(-1, "VJ [ack] ");
3022 sp->ipcp.flags |= IPCP_VJ;
3023 sl_compress_init(sp->pp_comp, p[4]);
3024 sp->ipcp.max_state = p[4];
3025 sp->ipcp.compress_cid = p[5];
3026 continue;
3027 }
3028 if (debug)
3029 log(-1,
3030 "compproto %#04x [not supported] ",
3031 desiredcomp);
3032 p[2] = IPCP_COMP_VJ >> 8;
3033 p[3] = IPCP_COMP_VJ;
3034 p[4] = sp->ipcp.max_state;
3035 p[5] = sp->ipcp.compress_cid;
3036 break;
3037 case IPCP_OPT_ADDRESS:
3038 /* This is the address he wants in his end */
3039 desiredaddr = p[2] << 24 | p[3] << 16 |
3040 p[4] << 8 | p[5];
3041 if (desiredaddr == hisaddr ||
3042 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3043 /*
3044 * Peer's address is same as our value,
3045 * or we have set it to 0.0.0.* to
3046 * indicate that we do not really care,
3047 * this is agreeable. Gonna conf-ack
3048 * it.
3049 */
3050 if (debug)
3051 log(-1, "%s [ack] ",
3052 sppp_dotted_quad(hisaddr));
3053 /* record that we've seen it already */
3054 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3055 continue;
3056 }
3057 /*
3058 * The address wasn't agreeable. This is either
3059 * he sent us 0.0.0.0, asking to assign him an
3060 * address, or he send us another address not
3061 * matching our value. Either case, we gonna
3062 * conf-nak it with our value.
3063 * XXX: we should "rej" if hisaddr == 0
3064 */
3065 if (debug) {
3066 if (desiredaddr == 0)
3067 log(-1, "[addr requested] ");
3068 else
3069 log(-1, "%s [not agreed] ",
3070 sppp_dotted_quad(desiredaddr));
3071 }
3072 p[2] = hisaddr >> 24;
3073 p[3] = hisaddr >> 16;
3074 p[4] = hisaddr >> 8;
3075 p[5] = hisaddr;
3076 break;
3077 }
3078 /* Add the option to nak'ed list. */
3079 bcopy (p, r, p[1]);
3080 r += p[1];
3081 rlen += p[1];
3082 }
3083
3084 /*
3085 * If we are about to conf-ack the request, but haven't seen
3086 * his address so far, gonna conf-nak it instead, with the
3087 * `address' option present and our idea of his address being
3088 * filled in there, to request negotiation of both addresses.
3089 *
3090 * XXX This can result in an endless req - nak loop if peer
3091 * doesn't want to send us his address. Q: What should we do
3092 * about it? XXX A: implement the max-failure counter.
3093 */
3094 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3095 buf[0] = IPCP_OPT_ADDRESS;
3096 buf[1] = 6;
3097 buf[2] = hisaddr >> 24;
3098 buf[3] = hisaddr >> 16;
3099 buf[4] = hisaddr >> 8;
3100 buf[5] = hisaddr;
3101 rlen = 6;
3102 if (debug)
3103 log(-1, "still need hisaddr ");
3104 }
3105
3106 if (rlen) {
3107 if (debug)
3108 log(-1, " send conf-nak\n");
3109 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3110 } else {
3111 if (debug)
3112 log(-1, " send conf-ack\n");
3113 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3114 h->ident, origlen, h+1);
3115 }
3116
3117 free (buf, M_TEMP);
3118 return (rlen == 0);
3119 }
3120
3121 /*
3122 * Analyze the IPCP Configure-Reject option list, and adjust our
3123 * negotiation.
3124 */
3125 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3126 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3127 {
3128 u_char *buf, *p;
3129 struct ifnet *ifp = SP2IFP(sp);
3130 int debug = ifp->if_flags & IFF_DEBUG;
3131
3132 len -= 4;
3133 buf = malloc (len, M_TEMP, M_NOWAIT);
3134 if (!buf)
3135 return;
3136
3137 if (debug)
3138 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3139 SPP_ARGS(ifp));
3140
3141 p = (void*) (h+1);
3142 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3143 len -= p[1], p += p[1]) {
3144 if (debug)
3145 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3146 switch (*p) {
3147 case IPCP_OPT_COMPRESSION:
3148 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3149 break;
3150 case IPCP_OPT_ADDRESS:
3151 /*
3152 * Peer doesn't grok address option. This is
3153 * bad. XXX Should we better give up here?
3154 * XXX We could try old "addresses" option...
3155 */
3156 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3157 break;
3158 }
3159 }
3160 if (debug)
3161 log(-1, "\n");
3162 free (buf, M_TEMP);
3163 return;
3164 }
3165
3166 /*
3167 * Analyze the IPCP Configure-NAK option list, and adjust our
3168 * negotiation.
3169 */
3170 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3171 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3172 {
3173 u_char *buf, *p;
3174 struct ifnet *ifp = SP2IFP(sp);
3175 int debug = ifp->if_flags & IFF_DEBUG;
3176 int desiredcomp;
3177 u_long wantaddr;
3178
3179 len -= 4;
3180 buf = malloc (len, M_TEMP, M_NOWAIT);
3181 if (!buf)
3182 return;
3183
3184 if (debug)
3185 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3186 SPP_ARGS(ifp));
3187
3188 p = (void*) (h+1);
3189 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3190 len -= p[1], p += p[1]) {
3191 if (debug)
3192 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3193 switch (*p) {
3194 case IPCP_OPT_COMPRESSION:
3195 if (len >= 6 && p[1] == 6) {
3196 desiredcomp = p[2] << 8 | p[3];
3197 if (debug)
3198 log(-1, "[wantcomp %#04x] ",
3199 desiredcomp);
3200 if (desiredcomp == IPCP_COMP_VJ) {
3201 sl_compress_init(sp->pp_comp, p[4]);
3202 sp->ipcp.max_state = p[4];
3203 sp->ipcp.compress_cid = p[5];
3204 if (debug)
3205 log(-1, "[agree] ");
3206 } else
3207 sp->ipcp.opts &=
3208 ~(1 << IPCP_OPT_COMPRESSION);
3209 }
3210 break;
3211 case IPCP_OPT_ADDRESS:
3212 /*
3213 * Peer doesn't like our local IP address. See
3214 * if we can do something for him. We'll drop
3215 * him our address then.
3216 */
3217 if (len >= 6 && p[1] == 6) {
3218 wantaddr = p[2] << 24 | p[3] << 16 |
3219 p[4] << 8 | p[5];
3220 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3221 if (debug)
3222 log(-1, "[wantaddr %s] ",
3223 sppp_dotted_quad(wantaddr));
3224 /*
3225 * When doing dynamic address assignment,
3226 * we accept his offer. Otherwise, we
3227 * ignore it and thus continue to negotiate
3228 * our already existing value.
3229 * XXX: Bogus, if he said no once, he'll
3230 * just say no again, might as well die.
3231 */
3232 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3233 sppp_set_ip_addr(sp, wantaddr);
3234 if (debug)
3235 log(-1, "[agree] ");
3236 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3237 }
3238 }
3239 break;
3240 }
3241 }
3242 if (debug)
3243 log(-1, "\n");
3244 free (buf, M_TEMP);
3245 return;
3246 }
3247
3248 static void
sppp_ipcp_tlu(struct sppp * sp)3249 sppp_ipcp_tlu(struct sppp *sp)
3250 {
3251 /* we are up - notify isdn daemon */
3252 if (sp->pp_con)
3253 sp->pp_con(sp);
3254 }
3255
3256 static void
sppp_ipcp_tld(struct sppp * sp)3257 sppp_ipcp_tld(struct sppp *sp)
3258 {
3259 }
3260
3261 static void
sppp_ipcp_tls(struct sppp * sp)3262 sppp_ipcp_tls(struct sppp *sp)
3263 {
3264 /* indicate to LCP that it must stay alive */
3265 sp->lcp.protos |= (1 << IDX_IPCP);
3266 }
3267
3268 static void
sppp_ipcp_tlf(struct sppp * sp)3269 sppp_ipcp_tlf(struct sppp *sp)
3270 {
3271 /* we no longer need LCP */
3272 sp->lcp.protos &= ~(1 << IDX_IPCP);
3273 sppp_lcp_check_and_close(sp);
3274 }
3275
3276 static void
sppp_ipcp_scr(struct sppp * sp)3277 sppp_ipcp_scr(struct sppp *sp)
3278 {
3279 char opt[6 /* compression */ + 6 /* address */];
3280 u_long ouraddr;
3281 int i = 0;
3282
3283 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3284 opt[i++] = IPCP_OPT_COMPRESSION;
3285 opt[i++] = 6;
3286 opt[i++] = IPCP_COMP_VJ >> 8;
3287 opt[i++] = IPCP_COMP_VJ;
3288 opt[i++] = sp->ipcp.max_state;
3289 opt[i++] = sp->ipcp.compress_cid;
3290 }
3291 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3292 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3293 opt[i++] = IPCP_OPT_ADDRESS;
3294 opt[i++] = 6;
3295 opt[i++] = ouraddr >> 24;
3296 opt[i++] = ouraddr >> 16;
3297 opt[i++] = ouraddr >> 8;
3298 opt[i++] = ouraddr;
3299 }
3300
3301 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3302 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3303 }
3304 #else /* !INET */
3305 static void
sppp_ipcp_init(struct sppp * sp)3306 sppp_ipcp_init(struct sppp *sp)
3307 {
3308 }
3309
3310 static void
sppp_ipcp_up(struct sppp * sp)3311 sppp_ipcp_up(struct sppp *sp)
3312 {
3313 }
3314
3315 static void
sppp_ipcp_down(struct sppp * sp)3316 sppp_ipcp_down(struct sppp *sp)
3317 {
3318 }
3319
3320 static void
sppp_ipcp_open(struct sppp * sp)3321 sppp_ipcp_open(struct sppp *sp)
3322 {
3323 }
3324
3325 static void
sppp_ipcp_close(struct sppp * sp)3326 sppp_ipcp_close(struct sppp *sp)
3327 {
3328 }
3329
3330 static void
sppp_ipcp_TO(void * cookie)3331 sppp_ipcp_TO(void *cookie)
3332 {
3333 }
3334
3335 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)3336 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3337 {
3338 return (0);
3339 }
3340
3341 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3342 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3343 {
3344 }
3345
3346 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3347 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3348 {
3349 }
3350
3351 static void
sppp_ipcp_tlu(struct sppp * sp)3352 sppp_ipcp_tlu(struct sppp *sp)
3353 {
3354 }
3355
3356 static void
sppp_ipcp_tld(struct sppp * sp)3357 sppp_ipcp_tld(struct sppp *sp)
3358 {
3359 }
3360
3361 static void
sppp_ipcp_tls(struct sppp * sp)3362 sppp_ipcp_tls(struct sppp *sp)
3363 {
3364 }
3365
3366 static void
sppp_ipcp_tlf(struct sppp * sp)3367 sppp_ipcp_tlf(struct sppp *sp)
3368 {
3369 }
3370
3371 static void
sppp_ipcp_scr(struct sppp * sp)3372 sppp_ipcp_scr(struct sppp *sp)
3373 {
3374 }
3375 #endif
3376
3377 /*
3378 *--------------------------------------------------------------------------*
3379 * *
3380 * The IPv6CP implementation. *
3381 * *
3382 *--------------------------------------------------------------------------*
3383 */
3384
3385 #ifdef INET6
3386 static void
sppp_ipv6cp_init(struct sppp * sp)3387 sppp_ipv6cp_init(struct sppp *sp)
3388 {
3389 sp->ipv6cp.opts = 0;
3390 sp->ipv6cp.flags = 0;
3391 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3392 sp->fail_counter[IDX_IPV6CP] = 0;
3393 sp->pp_seq[IDX_IPV6CP] = 0;
3394 sp->pp_rseq[IDX_IPV6CP] = 0;
3395 callout_init(&sp->ch[IDX_IPV6CP], 1);
3396 }
3397
3398 static void
sppp_ipv6cp_up(struct sppp * sp)3399 sppp_ipv6cp_up(struct sppp *sp)
3400 {
3401 sppp_up_event(&ipv6cp, sp);
3402 }
3403
3404 static void
sppp_ipv6cp_down(struct sppp * sp)3405 sppp_ipv6cp_down(struct sppp *sp)
3406 {
3407 sppp_down_event(&ipv6cp, sp);
3408 }
3409
3410 static void
sppp_ipv6cp_open(struct sppp * sp)3411 sppp_ipv6cp_open(struct sppp *sp)
3412 {
3413 STDDCL;
3414 struct in6_addr myaddr, hisaddr;
3415
3416 #ifdef IPV6CP_MYIFID_DYN
3417 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3418 #else
3419 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3420 #endif
3421
3422 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3423 /*
3424 * If we don't have our address, this probably means our
3425 * interface doesn't want to talk IPv6 at all. (This could
3426 * be the case if somebody wants to speak only IPX, for
3427 * example.) Don't open IPv6CP in this case.
3428 */
3429 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3430 /* XXX this message should go away */
3431 if (debug)
3432 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3433 SPP_ARGS(ifp));
3434 return;
3435 }
3436
3437 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3438 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3439 sppp_open_event(&ipv6cp, sp);
3440 }
3441
3442 static void
sppp_ipv6cp_close(struct sppp * sp)3443 sppp_ipv6cp_close(struct sppp *sp)
3444 {
3445 sppp_close_event(&ipv6cp, sp);
3446 }
3447
3448 static void
sppp_ipv6cp_TO(void * cookie)3449 sppp_ipv6cp_TO(void *cookie)
3450 {
3451 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3452 }
3453
3454 /*
3455 * Analyze a configure request. Return true if it was agreeable, and
3456 * caused action sca, false if it has been rejected or nak'ed, and
3457 * caused action scn. (The return value is used to make the state
3458 * transition decision in the state automaton.)
3459 */
3460 static int
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3461 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3462 {
3463 u_char *buf, *r, *p;
3464 struct ifnet *ifp = SP2IFP(sp);
3465 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3466 struct in6_addr myaddr, desiredaddr, suggestaddr;
3467 int ifidcount;
3468 int type;
3469 int collision, nohisaddr;
3470 char ip6buf[INET6_ADDRSTRLEN];
3471
3472 len -= 4;
3473 origlen = len;
3474 /*
3475 * Make sure to allocate a buf that can at least hold a
3476 * conf-nak with an `address' option. We might need it below.
3477 */
3478 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3479 if (! buf)
3480 return (0);
3481
3482 /* pass 1: see if we can recognize them */
3483 if (debug)
3484 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3485 SPP_ARGS(ifp));
3486 p = (void*) (h+1);
3487 ifidcount = 0;
3488 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3489 len-=p[1], p+=p[1]) {
3490 if (debug)
3491 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3492 switch (*p) {
3493 case IPV6CP_OPT_IFID:
3494 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3495 /* correctly formed address option */
3496 ifidcount++;
3497 continue;
3498 }
3499 if (debug)
3500 log(-1, " [invalid]");
3501 break;
3502 #ifdef notyet
3503 case IPV6CP_OPT_COMPRESSION:
3504 if (len >= 4 && p[1] >= 4) {
3505 /* correctly formed compress option */
3506 continue;
3507 }
3508 if (debug)
3509 log(-1, " [invalid]");
3510 break;
3511 #endif
3512 default:
3513 /* Others not supported. */
3514 if (debug)
3515 log(-1, " [rej]");
3516 break;
3517 }
3518 /* Add the option to rejected list. */
3519 bcopy (p, r, p[1]);
3520 r += p[1];
3521 rlen += p[1];
3522 }
3523 if (rlen) {
3524 if (debug)
3525 log(-1, " send conf-rej\n");
3526 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3527 goto end;
3528 } else if (debug)
3529 log(-1, "\n");
3530
3531 /* pass 2: parse option values */
3532 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3533 if (debug)
3534 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3535 SPP_ARGS(ifp));
3536 p = (void*) (h+1);
3537 len = origlen;
3538 type = CONF_ACK;
3539 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3540 len-=p[1], p+=p[1]) {
3541 if (debug)
3542 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3543 switch (*p) {
3544 #ifdef notyet
3545 case IPV6CP_OPT_COMPRESSION:
3546 continue;
3547 #endif
3548 case IPV6CP_OPT_IFID:
3549 bzero(&desiredaddr, sizeof(desiredaddr));
3550 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3551 collision = (bcmp(&desiredaddr.s6_addr[8],
3552 &myaddr.s6_addr[8], 8) == 0);
3553 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3554
3555 desiredaddr.s6_addr16[0] = htons(0xfe80);
3556 (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3557
3558 if (!collision && !nohisaddr) {
3559 /* no collision, hisaddr known - Conf-Ack */
3560 type = CONF_ACK;
3561
3562 if (debug) {
3563 log(-1, " %s [%s]",
3564 ip6_sprintf(ip6buf, &desiredaddr),
3565 sppp_cp_type_name(type));
3566 }
3567 continue;
3568 }
3569
3570 bzero(&suggestaddr, sizeof(suggestaddr));
3571 if (collision && nohisaddr) {
3572 /* collision, hisaddr unknown - Conf-Rej */
3573 type = CONF_REJ;
3574 bzero(&p[2], 8);
3575 } else {
3576 /*
3577 * - no collision, hisaddr unknown, or
3578 * - collision, hisaddr known
3579 * Conf-Nak, suggest hisaddr
3580 */
3581 type = CONF_NAK;
3582 sppp_suggest_ip6_addr(sp, &suggestaddr);
3583 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3584 }
3585 if (debug)
3586 log(-1, " %s [%s]",
3587 ip6_sprintf(ip6buf, &desiredaddr),
3588 sppp_cp_type_name(type));
3589 break;
3590 }
3591 /* Add the option to nak'ed list. */
3592 bcopy (p, r, p[1]);
3593 r += p[1];
3594 rlen += p[1];
3595 }
3596
3597 if (rlen == 0 && type == CONF_ACK) {
3598 if (debug)
3599 log(-1, " send %s\n", sppp_cp_type_name(type));
3600 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3601 } else {
3602 #ifdef DIAGNOSTIC
3603 if (type == CONF_ACK)
3604 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3605 #endif
3606
3607 if (debug) {
3608 log(-1, " send %s suggest %s\n",
3609 sppp_cp_type_name(type),
3610 ip6_sprintf(ip6buf, &suggestaddr));
3611 }
3612 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3613 }
3614
3615 end:
3616 free (buf, M_TEMP);
3617 return (rlen == 0);
3618 }
3619
3620 /*
3621 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3622 * negotiation.
3623 */
3624 static void
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3625 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3626 {
3627 u_char *buf, *p;
3628 struct ifnet *ifp = SP2IFP(sp);
3629 int debug = ifp->if_flags & IFF_DEBUG;
3630
3631 len -= 4;
3632 buf = malloc (len, M_TEMP, M_NOWAIT);
3633 if (!buf)
3634 return;
3635
3636 if (debug)
3637 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3638 SPP_ARGS(ifp));
3639
3640 p = (void*) (h+1);
3641 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3642 len -= p[1], p += p[1]) {
3643 if (debug)
3644 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3645 switch (*p) {
3646 case IPV6CP_OPT_IFID:
3647 /*
3648 * Peer doesn't grok address option. This is
3649 * bad. XXX Should we better give up here?
3650 */
3651 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3652 break;
3653 #ifdef notyet
3654 case IPV6CP_OPT_COMPRESS:
3655 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3656 break;
3657 #endif
3658 }
3659 }
3660 if (debug)
3661 log(-1, "\n");
3662 free (buf, M_TEMP);
3663 return;
3664 }
3665
3666 /*
3667 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3668 * negotiation.
3669 */
3670 static void
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3671 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3672 {
3673 u_char *buf, *p;
3674 struct ifnet *ifp = SP2IFP(sp);
3675 int debug = ifp->if_flags & IFF_DEBUG;
3676 struct in6_addr suggestaddr;
3677 char ip6buf[INET6_ADDRSTRLEN];
3678
3679 len -= 4;
3680 buf = malloc (len, M_TEMP, M_NOWAIT);
3681 if (!buf)
3682 return;
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 >= 2 && p[1] >= 2 && len >= p[1];
3690 len -= p[1], p += p[1]) {
3691 if (debug)
3692 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3693 switch (*p) {
3694 case IPV6CP_OPT_IFID:
3695 /*
3696 * Peer doesn't like our local ifid. See
3697 * if we can do something for him. We'll drop
3698 * him our address then.
3699 */
3700 if (len < 10 || p[1] != 10)
3701 break;
3702 bzero(&suggestaddr, sizeof(suggestaddr));
3703 suggestaddr.s6_addr16[0] = htons(0xfe80);
3704 (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3705 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3706
3707 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3708 if (debug)
3709 log(-1, " [suggestaddr %s]",
3710 ip6_sprintf(ip6buf, &suggestaddr));
3711 #ifdef IPV6CP_MYIFID_DYN
3712 /*
3713 * When doing dynamic address assignment,
3714 * we accept his offer.
3715 */
3716 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3717 struct in6_addr lastsuggest;
3718 /*
3719 * If <suggested myaddr from peer> equals to
3720 * <hisaddr we have suggested last time>,
3721 * we have a collision. generate new random
3722 * ifid.
3723 */
3724 sppp_suggest_ip6_addr(&lastsuggest);
3725 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3726 lastsuggest)) {
3727 if (debug)
3728 log(-1, " [random]");
3729 sppp_gen_ip6_addr(sp, &suggestaddr);
3730 }
3731 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3732 if (debug)
3733 log(-1, " [agree]");
3734 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3735 }
3736 #else
3737 /*
3738 * Since we do not do dynamic address assignment,
3739 * we ignore it and thus continue to negotiate
3740 * our already existing value. This can possibly
3741 * go into infinite request-reject loop.
3742 *
3743 * This is not likely because we normally use
3744 * ifid based on MAC-address.
3745 * If you have no ethernet card on the node, too bad.
3746 * XXX should we use fail_counter?
3747 */
3748 #endif
3749 break;
3750 #ifdef notyet
3751 case IPV6CP_OPT_COMPRESS:
3752 /*
3753 * Peer wants different compression parameters.
3754 */
3755 break;
3756 #endif
3757 }
3758 }
3759 if (debug)
3760 log(-1, "\n");
3761 free (buf, M_TEMP);
3762 return;
3763 }
3764 static void
sppp_ipv6cp_tlu(struct sppp * sp)3765 sppp_ipv6cp_tlu(struct sppp *sp)
3766 {
3767 /* we are up - notify isdn daemon */
3768 if (sp->pp_con)
3769 sp->pp_con(sp);
3770 }
3771
3772 static void
sppp_ipv6cp_tld(struct sppp * sp)3773 sppp_ipv6cp_tld(struct sppp *sp)
3774 {
3775 }
3776
3777 static void
sppp_ipv6cp_tls(struct sppp * sp)3778 sppp_ipv6cp_tls(struct sppp *sp)
3779 {
3780 /* indicate to LCP that it must stay alive */
3781 sp->lcp.protos |= (1 << IDX_IPV6CP);
3782 }
3783
3784 static void
sppp_ipv6cp_tlf(struct sppp * sp)3785 sppp_ipv6cp_tlf(struct sppp *sp)
3786 {
3787
3788 #if 0 /* need #if 0 to close IPv6CP properly */
3789 /* we no longer need LCP */
3790 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3791 sppp_lcp_check_and_close(sp);
3792 #endif
3793 }
3794
3795 static void
sppp_ipv6cp_scr(struct sppp * sp)3796 sppp_ipv6cp_scr(struct sppp *sp)
3797 {
3798 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3799 struct in6_addr ouraddr;
3800 int i = 0;
3801
3802 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3803 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3804 opt[i++] = IPV6CP_OPT_IFID;
3805 opt[i++] = 10;
3806 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3807 i += 8;
3808 }
3809
3810 #ifdef notyet
3811 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3812 opt[i++] = IPV6CP_OPT_COMPRESSION;
3813 opt[i++] = 4;
3814 opt[i++] = 0; /* TBD */
3815 opt[i++] = 0; /* TBD */
3816 /* variable length data may follow */
3817 }
3818 #endif
3819
3820 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3821 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3822 }
3823 #else /*INET6*/
sppp_ipv6cp_init(struct sppp * sp)3824 static void sppp_ipv6cp_init(struct sppp *sp)
3825 {
3826 }
3827
sppp_ipv6cp_up(struct sppp * sp)3828 static void sppp_ipv6cp_up(struct sppp *sp)
3829 {
3830 }
3831
sppp_ipv6cp_down(struct sppp * sp)3832 static void sppp_ipv6cp_down(struct sppp *sp)
3833 {
3834 }
3835
sppp_ipv6cp_open(struct sppp * sp)3836 static void sppp_ipv6cp_open(struct sppp *sp)
3837 {
3838 }
3839
sppp_ipv6cp_close(struct sppp * sp)3840 static void sppp_ipv6cp_close(struct sppp *sp)
3841 {
3842 }
3843
sppp_ipv6cp_TO(void * sp)3844 static void sppp_ipv6cp_TO(void *sp)
3845 {
3846 }
3847
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3848 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3849 {
3850 return 0;
3851 }
3852
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3853 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3854 {
3855 }
3856
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3857 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3858 {
3859 }
3860
sppp_ipv6cp_tlu(struct sppp * sp)3861 static void sppp_ipv6cp_tlu(struct sppp *sp)
3862 {
3863 }
3864
sppp_ipv6cp_tld(struct sppp * sp)3865 static void sppp_ipv6cp_tld(struct sppp *sp)
3866 {
3867 }
3868
sppp_ipv6cp_tls(struct sppp * sp)3869 static void sppp_ipv6cp_tls(struct sppp *sp)
3870 {
3871 }
3872
sppp_ipv6cp_tlf(struct sppp * sp)3873 static void sppp_ipv6cp_tlf(struct sppp *sp)
3874 {
3875 }
3876
sppp_ipv6cp_scr(struct sppp * sp)3877 static void sppp_ipv6cp_scr(struct sppp *sp)
3878 {
3879 }
3880 #endif /*INET6*/
3881
3882 /*
3883 *--------------------------------------------------------------------------*
3884 * *
3885 * The CHAP implementation. *
3886 * *
3887 *--------------------------------------------------------------------------*
3888 */
3889
3890 /*
3891 * The authentication protocols don't employ a full-fledged state machine as
3892 * the control protocols do, since they do have Open and Close events, but
3893 * not Up and Down, nor are they explicitly terminated. Also, use of the
3894 * authentication protocols may be different in both directions (this makes
3895 * sense, think of a machine that never accepts incoming calls but only
3896 * calls out, it doesn't require the called party to authenticate itself).
3897 *
3898 * Our state machine for the local authentication protocol (we are requesting
3899 * the peer to authenticate) looks like:
3900 *
3901 * RCA-
3902 * +--------------------------------------------+
3903 * V scn,tld|
3904 * +--------+ Close +---------+ RCA+
3905 * | |<----------------------------------| |------+
3906 * +--->| Closed | TO* | Opened | sca |
3907 * | | |-----+ +-------| |<-----+
3908 * | +--------+ irc | | +---------+
3909 * | ^ | | ^
3910 * | | | | |
3911 * | | | | |
3912 * | TO-| | | |
3913 * | |tld TO+ V | |
3914 * | | +------->+ | |
3915 * | | | | | |
3916 * | +--------+ V | |
3917 * | | |<----+<--------------------+ |
3918 * | | Req- | scr |
3919 * | | Sent | |
3920 * | | | |
3921 * | +--------+ |
3922 * | RCA- | | RCA+ |
3923 * +------+ +------------------------------------------+
3924 * scn,tld sca,irc,ict,tlu
3925 *
3926 *
3927 * with:
3928 *
3929 * Open: LCP reached authentication phase
3930 * Close: LCP reached terminate phase
3931 *
3932 * RCA+: received reply (pap-req, chap-response), acceptable
3933 * RCN: received reply (pap-req, chap-response), not acceptable
3934 * TO+: timeout with restart counter >= 0
3935 * TO-: timeout with restart counter < 0
3936 * TO*: reschedule timeout for CHAP
3937 *
3938 * scr: send request packet (none for PAP, chap-challenge)
3939 * sca: send ack packet (pap-ack, chap-success)
3940 * scn: send nak packet (pap-nak, chap-failure)
3941 * ict: initialize re-challenge timer (CHAP only)
3942 *
3943 * tlu: this-layer-up, LCP reaches network phase
3944 * tld: this-layer-down, LCP enters terminate phase
3945 *
3946 * Note that in CHAP mode, after sending a new challenge, while the state
3947 * automaton falls back into Req-Sent state, it doesn't signal a tld
3948 * event to LCP, so LCP remains in network phase. Only after not getting
3949 * any response (or after getting an unacceptable response), CHAP closes,
3950 * causing LCP to enter terminate phase.
3951 *
3952 * With PAP, there is no initial request that can be sent. The peer is
3953 * expected to send one based on the successful negotiation of PAP as
3954 * the authentication protocol during the LCP option negotiation.
3955 *
3956 * Incoming authentication protocol requests (remote requests
3957 * authentication, we are peer) don't employ a state machine at all,
3958 * they are simply answered. Some peers [Ascend P50 firmware rev
3959 * 4.50] react allergically when sending IPCP requests while they are
3960 * still in authentication phase (thereby violating the standard that
3961 * demands that these NCP packets are to be discarded), so we keep
3962 * track of the peer demanding us to authenticate, and only proceed to
3963 * phase network once we've seen a positive acknowledge for the
3964 * authentication.
3965 */
3966
3967 /*
3968 * Handle incoming CHAP packets.
3969 */
3970 static void
sppp_chap_input(struct sppp * sp,struct mbuf * m)3971 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3972 {
3973 STDDCL;
3974 struct lcp_header *h;
3975 int len;
3976 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3977 int value_len, name_len;
3978 MD5_CTX ctx;
3979
3980 len = m->m_pkthdr.len;
3981 if (len < 4) {
3982 if (debug)
3983 log(LOG_DEBUG,
3984 SPP_FMT "chap invalid packet length: %d bytes\n",
3985 SPP_ARGS(ifp), len);
3986 return;
3987 }
3988 h = mtod (m, struct lcp_header*);
3989 if (len > ntohs (h->len))
3990 len = ntohs (h->len);
3991
3992 switch (h->type) {
3993 /* challenge, failure and success are his authproto */
3994 case CHAP_CHALLENGE:
3995 value = 1 + (u_char*)(h+1);
3996 value_len = value[-1];
3997 name = value + value_len;
3998 name_len = len - value_len - 5;
3999 if (name_len < 0) {
4000 if (debug) {
4001 log(LOG_DEBUG,
4002 SPP_FMT "chap corrupted challenge "
4003 "<%s id=0x%x len=%d",
4004 SPP_ARGS(ifp),
4005 sppp_auth_type_name(PPP_CHAP, h->type),
4006 h->ident, ntohs(h->len));
4007 sppp_print_bytes((u_char*) (h+1), len-4);
4008 log(-1, ">\n");
4009 }
4010 break;
4011 }
4012
4013 if (debug) {
4014 log(LOG_DEBUG,
4015 SPP_FMT "chap input <%s id=0x%x len=%d name=",
4016 SPP_ARGS(ifp),
4017 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4018 ntohs(h->len));
4019 sppp_print_string((char*) name, name_len);
4020 log(-1, " value-size=%d value=", value_len);
4021 sppp_print_bytes(value, value_len);
4022 log(-1, ">\n");
4023 }
4024
4025 /* Compute reply value. */
4026 MD5Init(&ctx);
4027 MD5Update(&ctx, &h->ident, 1);
4028 MD5Update(&ctx, sp->myauth.secret,
4029 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4030 MD5Update(&ctx, value, value_len);
4031 MD5Final(digest, &ctx);
4032 dsize = sizeof digest;
4033
4034 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4035 sizeof dsize, (const char *)&dsize,
4036 sizeof digest, digest,
4037 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4038 sp->myauth.name,
4039 0);
4040 break;
4041
4042 case CHAP_SUCCESS:
4043 if (debug) {
4044 log(LOG_DEBUG, SPP_FMT "chap success",
4045 SPP_ARGS(ifp));
4046 if (len > 4) {
4047 log(-1, ": ");
4048 sppp_print_string((char*)(h + 1), len - 4);
4049 }
4050 log(-1, "\n");
4051 }
4052 SPPP_LOCK(sp);
4053 sp->pp_flags &= ~PP_NEEDAUTH;
4054 if (sp->myauth.proto == PPP_CHAP &&
4055 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4056 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4057 /*
4058 * We are authenticator for CHAP but didn't
4059 * complete yet. Leave it to tlu to proceed
4060 * to network phase.
4061 */
4062 SPPP_UNLOCK(sp);
4063 break;
4064 }
4065 SPPP_UNLOCK(sp);
4066 sppp_phase_network(sp);
4067 break;
4068
4069 case CHAP_FAILURE:
4070 if (debug) {
4071 log(LOG_INFO, SPP_FMT "chap failure",
4072 SPP_ARGS(ifp));
4073 if (len > 4) {
4074 log(-1, ": ");
4075 sppp_print_string((char*)(h + 1), len - 4);
4076 }
4077 log(-1, "\n");
4078 } else
4079 log(LOG_INFO, SPP_FMT "chap failure\n",
4080 SPP_ARGS(ifp));
4081 /* await LCP shutdown by authenticator */
4082 break;
4083
4084 /* response is my authproto */
4085 case CHAP_RESPONSE:
4086 value = 1 + (u_char*)(h+1);
4087 value_len = value[-1];
4088 name = value + value_len;
4089 name_len = len - value_len - 5;
4090 if (name_len < 0) {
4091 if (debug) {
4092 log(LOG_DEBUG,
4093 SPP_FMT "chap corrupted response "
4094 "<%s id=0x%x len=%d",
4095 SPP_ARGS(ifp),
4096 sppp_auth_type_name(PPP_CHAP, h->type),
4097 h->ident, ntohs(h->len));
4098 sppp_print_bytes((u_char*)(h+1), len-4);
4099 log(-1, ">\n");
4100 }
4101 break;
4102 }
4103 if (h->ident != sp->confid[IDX_CHAP]) {
4104 if (debug)
4105 log(LOG_DEBUG,
4106 SPP_FMT "chap dropping response for old ID "
4107 "(got %d, expected %d)\n",
4108 SPP_ARGS(ifp),
4109 h->ident, sp->confid[IDX_CHAP]);
4110 break;
4111 }
4112 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4113 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4114 log(LOG_INFO, SPP_FMT "chap response, his name ",
4115 SPP_ARGS(ifp));
4116 sppp_print_string(name, name_len);
4117 log(-1, " != expected ");
4118 sppp_print_string(sp->hisauth.name,
4119 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4120 log(-1, "\n");
4121 }
4122 if (debug) {
4123 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4124 "<%s id=0x%x len=%d name=",
4125 SPP_ARGS(ifp),
4126 sppp_state_name(sp->state[IDX_CHAP]),
4127 sppp_auth_type_name(PPP_CHAP, h->type),
4128 h->ident, ntohs (h->len));
4129 sppp_print_string((char*)name, name_len);
4130 log(-1, " value-size=%d value=", value_len);
4131 sppp_print_bytes(value, value_len);
4132 log(-1, ">\n");
4133 }
4134 if (value_len != AUTHKEYLEN) {
4135 if (debug)
4136 log(LOG_DEBUG,
4137 SPP_FMT "chap bad hash value length: "
4138 "%d bytes, should be %d\n",
4139 SPP_ARGS(ifp), value_len,
4140 AUTHKEYLEN);
4141 break;
4142 }
4143
4144 MD5Init(&ctx);
4145 MD5Update(&ctx, &h->ident, 1);
4146 MD5Update(&ctx, sp->hisauth.secret,
4147 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4148 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4149 MD5Final(digest, &ctx);
4150
4151 #define FAILMSG "Failed..."
4152 #define SUCCMSG "Welcome!"
4153
4154 if (value_len != sizeof digest ||
4155 bcmp(digest, value, value_len) != 0) {
4156 /* action scn, tld */
4157 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4158 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4159 0);
4160 chap.tld(sp);
4161 break;
4162 }
4163 /* action sca, perhaps tlu */
4164 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4165 sp->state[IDX_CHAP] == STATE_OPENED)
4166 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4167 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4168 0);
4169 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4170 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4171 chap.tlu(sp);
4172 }
4173 break;
4174
4175 default:
4176 /* Unknown CHAP packet type -- ignore. */
4177 if (debug) {
4178 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4179 "<0x%x id=0x%xh len=%d",
4180 SPP_ARGS(ifp),
4181 sppp_state_name(sp->state[IDX_CHAP]),
4182 h->type, h->ident, ntohs(h->len));
4183 sppp_print_bytes((u_char*)(h+1), len-4);
4184 log(-1, ">\n");
4185 }
4186 break;
4187 }
4188 }
4189
4190 static void
sppp_chap_init(struct sppp * sp)4191 sppp_chap_init(struct sppp *sp)
4192 {
4193 /* Chap doesn't have STATE_INITIAL at all. */
4194 sp->state[IDX_CHAP] = STATE_CLOSED;
4195 sp->fail_counter[IDX_CHAP] = 0;
4196 sp->pp_seq[IDX_CHAP] = 0;
4197 sp->pp_rseq[IDX_CHAP] = 0;
4198 callout_init(&sp->ch[IDX_CHAP], 1);
4199 }
4200
4201 static void
sppp_chap_open(struct sppp * sp)4202 sppp_chap_open(struct sppp *sp)
4203 {
4204 if (sp->myauth.proto == PPP_CHAP &&
4205 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4206 /* we are authenticator for CHAP, start it */
4207 chap.scr(sp);
4208 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4209 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4210 }
4211 /* nothing to be done if we are peer, await a challenge */
4212 }
4213
4214 static void
sppp_chap_close(struct sppp * sp)4215 sppp_chap_close(struct sppp *sp)
4216 {
4217 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4218 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4219 }
4220
4221 static void
sppp_chap_TO(void * cookie)4222 sppp_chap_TO(void *cookie)
4223 {
4224 struct sppp *sp = (struct sppp *)cookie;
4225 STDDCL;
4226
4227 SPPP_LOCK(sp);
4228 if (debug)
4229 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4230 SPP_ARGS(ifp),
4231 sppp_state_name(sp->state[IDX_CHAP]),
4232 sp->rst_counter[IDX_CHAP]);
4233
4234 if (--sp->rst_counter[IDX_CHAP] < 0)
4235 /* TO- event */
4236 switch (sp->state[IDX_CHAP]) {
4237 case STATE_REQ_SENT:
4238 chap.tld(sp);
4239 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4240 break;
4241 }
4242 else
4243 /* TO+ (or TO*) event */
4244 switch (sp->state[IDX_CHAP]) {
4245 case STATE_OPENED:
4246 /* TO* event */
4247 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4248 /* FALLTHROUGH */
4249 case STATE_REQ_SENT:
4250 chap.scr(sp);
4251 /* sppp_cp_change_state() will restart the timer */
4252 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4253 break;
4254 }
4255
4256 SPPP_UNLOCK(sp);
4257 }
4258
4259 static void
sppp_chap_tlu(struct sppp * sp)4260 sppp_chap_tlu(struct sppp *sp)
4261 {
4262 STDDCL;
4263 int i;
4264
4265 i = 0;
4266 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4267
4268 /*
4269 * Some broken CHAP implementations (Conware CoNet, firmware
4270 * 4.0.?) don't want to re-authenticate their CHAP once the
4271 * initial challenge-response exchange has taken place.
4272 * Provide for an option to avoid rechallenges.
4273 */
4274 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4275 /*
4276 * Compute the re-challenge timeout. This will yield
4277 * a number between 300 and 810 seconds.
4278 */
4279 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4280 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4281 }
4282
4283 if (debug) {
4284 log(LOG_DEBUG,
4285 SPP_FMT "chap %s, ",
4286 SPP_ARGS(ifp),
4287 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4288 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4289 log(-1, "next re-challenge in %d seconds\n", i);
4290 else
4291 log(-1, "re-challenging suppressed\n");
4292 }
4293
4294 SPPP_LOCK(sp);
4295 /* indicate to LCP that we need to be closed down */
4296 sp->lcp.protos |= (1 << IDX_CHAP);
4297
4298 if (sp->pp_flags & PP_NEEDAUTH) {
4299 /*
4300 * Remote is authenticator, but his auth proto didn't
4301 * complete yet. Defer the transition to network
4302 * phase.
4303 */
4304 SPPP_UNLOCK(sp);
4305 return;
4306 }
4307 SPPP_UNLOCK(sp);
4308
4309 /*
4310 * If we are already in phase network, we are done here. This
4311 * is the case if this is a dummy tlu event after a re-challenge.
4312 */
4313 if (sp->pp_phase != PHASE_NETWORK)
4314 sppp_phase_network(sp);
4315 }
4316
4317 static void
sppp_chap_tld(struct sppp * sp)4318 sppp_chap_tld(struct sppp *sp)
4319 {
4320 STDDCL;
4321
4322 if (debug)
4323 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4324 callout_stop(&sp->ch[IDX_CHAP]);
4325 sp->lcp.protos &= ~(1 << IDX_CHAP);
4326
4327 lcp.Close(sp);
4328 }
4329
4330 static void
sppp_chap_scr(struct sppp * sp)4331 sppp_chap_scr(struct sppp *sp)
4332 {
4333 u_long *ch;
4334 u_char clen;
4335
4336 /* Compute random challenge. */
4337 ch = (u_long *)sp->myauth.challenge;
4338 arc4random_buf(ch, 4 * sizeof(*ch));
4339 clen = AUTHKEYLEN;
4340
4341 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4342
4343 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4344 sizeof clen, (const char *)&clen,
4345 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4346 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4347 sp->myauth.name,
4348 0);
4349 }
4350
4351 /*
4352 *--------------------------------------------------------------------------*
4353 * *
4354 * The PAP implementation. *
4355 * *
4356 *--------------------------------------------------------------------------*
4357 */
4358 /*
4359 * For PAP, we need to keep a little state also if we are the peer, not the
4360 * authenticator. This is since we don't get a request to authenticate, but
4361 * have to repeatedly authenticate ourself until we got a response (or the
4362 * retry counter is expired).
4363 */
4364
4365 /*
4366 * Handle incoming PAP packets. */
4367 static void
sppp_pap_input(struct sppp * sp,struct mbuf * m)4368 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4369 {
4370 STDDCL;
4371 struct lcp_header *h;
4372 int len;
4373 u_char *name, *passwd, mlen;
4374 int name_len, passwd_len;
4375
4376 len = m->m_pkthdr.len;
4377 if (len < 5) {
4378 if (debug)
4379 log(LOG_DEBUG,
4380 SPP_FMT "pap invalid packet length: %d bytes\n",
4381 SPP_ARGS(ifp), len);
4382 return;
4383 }
4384 h = mtod (m, struct lcp_header*);
4385 if (len > ntohs (h->len))
4386 len = ntohs (h->len);
4387 switch (h->type) {
4388 /* PAP request is my authproto */
4389 case PAP_REQ:
4390 name = 1 + (u_char*)(h+1);
4391 name_len = name[-1];
4392 passwd = name + name_len + 1;
4393 if (name_len > len - 6 ||
4394 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4395 if (debug) {
4396 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4397 "<%s id=0x%x len=%d",
4398 SPP_ARGS(ifp),
4399 sppp_auth_type_name(PPP_PAP, h->type),
4400 h->ident, ntohs(h->len));
4401 sppp_print_bytes((u_char*)(h+1), len-4);
4402 log(-1, ">\n");
4403 }
4404 break;
4405 }
4406 if (debug) {
4407 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4408 "<%s id=0x%x len=%d name=",
4409 SPP_ARGS(ifp),
4410 sppp_state_name(sp->state[IDX_PAP]),
4411 sppp_auth_type_name(PPP_PAP, h->type),
4412 h->ident, ntohs(h->len));
4413 sppp_print_string((char*)name, name_len);
4414 log(-1, " passwd=");
4415 sppp_print_string((char*)passwd, passwd_len);
4416 log(-1, ">\n");
4417 }
4418 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4419 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4420 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4421 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4422 /* action scn, tld */
4423 mlen = sizeof(FAILMSG) - 1;
4424 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4425 sizeof mlen, (const char *)&mlen,
4426 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4427 0);
4428 pap.tld(sp);
4429 break;
4430 }
4431 /* action sca, perhaps tlu */
4432 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4433 sp->state[IDX_PAP] == STATE_OPENED) {
4434 mlen = sizeof(SUCCMSG) - 1;
4435 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4436 sizeof mlen, (const char *)&mlen,
4437 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4438 0);
4439 }
4440 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4441 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4442 pap.tlu(sp);
4443 }
4444 break;
4445
4446 /* ack and nak are his authproto */
4447 case PAP_ACK:
4448 callout_stop(&sp->pap_my_to_ch);
4449 if (debug) {
4450 log(LOG_DEBUG, SPP_FMT "pap success",
4451 SPP_ARGS(ifp));
4452 name_len = *((char *)h);
4453 if (len > 5 && name_len) {
4454 log(-1, ": ");
4455 sppp_print_string((char*)(h+1), name_len);
4456 }
4457 log(-1, "\n");
4458 }
4459 SPPP_LOCK(sp);
4460 sp->pp_flags &= ~PP_NEEDAUTH;
4461 if (sp->myauth.proto == PPP_PAP &&
4462 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4463 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4464 /*
4465 * We are authenticator for PAP but didn't
4466 * complete yet. Leave it to tlu to proceed
4467 * to network phase.
4468 */
4469 SPPP_UNLOCK(sp);
4470 break;
4471 }
4472 SPPP_UNLOCK(sp);
4473 sppp_phase_network(sp);
4474 break;
4475
4476 case PAP_NAK:
4477 callout_stop (&sp->pap_my_to_ch);
4478 if (debug) {
4479 log(LOG_INFO, SPP_FMT "pap failure",
4480 SPP_ARGS(ifp));
4481 name_len = *((char *)h);
4482 if (len > 5 && name_len) {
4483 log(-1, ": ");
4484 sppp_print_string((char*)(h+1), name_len);
4485 }
4486 log(-1, "\n");
4487 } else
4488 log(LOG_INFO, SPP_FMT "pap failure\n",
4489 SPP_ARGS(ifp));
4490 /* await LCP shutdown by authenticator */
4491 break;
4492
4493 default:
4494 /* Unknown PAP packet type -- ignore. */
4495 if (debug) {
4496 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4497 "<0x%x id=0x%x len=%d",
4498 SPP_ARGS(ifp),
4499 h->type, h->ident, ntohs(h->len));
4500 sppp_print_bytes((u_char*)(h+1), len-4);
4501 log(-1, ">\n");
4502 }
4503 break;
4504 }
4505 }
4506
4507 static void
sppp_pap_init(struct sppp * sp)4508 sppp_pap_init(struct sppp *sp)
4509 {
4510 /* PAP doesn't have STATE_INITIAL at all. */
4511 sp->state[IDX_PAP] = STATE_CLOSED;
4512 sp->fail_counter[IDX_PAP] = 0;
4513 sp->pp_seq[IDX_PAP] = 0;
4514 sp->pp_rseq[IDX_PAP] = 0;
4515 callout_init(&sp->ch[IDX_PAP], 1);
4516 callout_init(&sp->pap_my_to_ch, 1);
4517 }
4518
4519 static void
sppp_pap_open(struct sppp * sp)4520 sppp_pap_open(struct sppp *sp)
4521 {
4522 if (sp->hisauth.proto == PPP_PAP &&
4523 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4524 /* we are authenticator for PAP, start our timer */
4525 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4526 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4527 }
4528 if (sp->myauth.proto == PPP_PAP) {
4529 /* we are peer, send a request, and start a timer */
4530 pap.scr(sp);
4531 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4532 sppp_pap_my_TO, (void *)sp);
4533 }
4534 }
4535
4536 static void
sppp_pap_close(struct sppp * sp)4537 sppp_pap_close(struct sppp *sp)
4538 {
4539 if (sp->state[IDX_PAP] != STATE_CLOSED)
4540 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4541 }
4542
4543 /*
4544 * That's the timeout routine if we are authenticator. Since the
4545 * authenticator is basically passive in PAP, we can't do much here.
4546 */
4547 static void
sppp_pap_TO(void * cookie)4548 sppp_pap_TO(void *cookie)
4549 {
4550 struct sppp *sp = (struct sppp *)cookie;
4551 STDDCL;
4552
4553 SPPP_LOCK(sp);
4554 if (debug)
4555 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4556 SPP_ARGS(ifp),
4557 sppp_state_name(sp->state[IDX_PAP]),
4558 sp->rst_counter[IDX_PAP]);
4559
4560 if (--sp->rst_counter[IDX_PAP] < 0)
4561 /* TO- event */
4562 switch (sp->state[IDX_PAP]) {
4563 case STATE_REQ_SENT:
4564 pap.tld(sp);
4565 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4566 break;
4567 }
4568 else
4569 /* TO+ event, not very much we could do */
4570 switch (sp->state[IDX_PAP]) {
4571 case STATE_REQ_SENT:
4572 /* sppp_cp_change_state() will restart the timer */
4573 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4574 break;
4575 }
4576
4577 SPPP_UNLOCK(sp);
4578 }
4579
4580 /*
4581 * That's the timeout handler if we are peer. Since the peer is active,
4582 * we need to retransmit our PAP request since it is apparently lost.
4583 * XXX We should impose a max counter.
4584 */
4585 static void
sppp_pap_my_TO(void * cookie)4586 sppp_pap_my_TO(void *cookie)
4587 {
4588 struct sppp *sp = (struct sppp *)cookie;
4589 STDDCL;
4590
4591 if (debug)
4592 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4593 SPP_ARGS(ifp));
4594
4595 SPPP_LOCK(sp);
4596 pap.scr(sp);
4597 SPPP_UNLOCK(sp);
4598 }
4599
4600 static void
sppp_pap_tlu(struct sppp * sp)4601 sppp_pap_tlu(struct sppp *sp)
4602 {
4603 STDDCL;
4604
4605 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4606
4607 if (debug)
4608 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4609 SPP_ARGS(ifp), pap.name);
4610
4611 SPPP_LOCK(sp);
4612 /* indicate to LCP that we need to be closed down */
4613 sp->lcp.protos |= (1 << IDX_PAP);
4614
4615 if (sp->pp_flags & PP_NEEDAUTH) {
4616 /*
4617 * Remote is authenticator, but his auth proto didn't
4618 * complete yet. Defer the transition to network
4619 * phase.
4620 */
4621 SPPP_UNLOCK(sp);
4622 return;
4623 }
4624 SPPP_UNLOCK(sp);
4625 sppp_phase_network(sp);
4626 }
4627
4628 static void
sppp_pap_tld(struct sppp * sp)4629 sppp_pap_tld(struct sppp *sp)
4630 {
4631 STDDCL;
4632
4633 if (debug)
4634 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4635 callout_stop (&sp->ch[IDX_PAP]);
4636 callout_stop (&sp->pap_my_to_ch);
4637 sp->lcp.protos &= ~(1 << IDX_PAP);
4638
4639 lcp.Close(sp);
4640 }
4641
4642 static void
sppp_pap_scr(struct sppp * sp)4643 sppp_pap_scr(struct sppp *sp)
4644 {
4645 u_char idlen, pwdlen;
4646
4647 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4648 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4649 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4650
4651 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4652 sizeof idlen, (const char *)&idlen,
4653 (size_t)idlen, sp->myauth.name,
4654 sizeof pwdlen, (const char *)&pwdlen,
4655 (size_t)pwdlen, sp->myauth.secret,
4656 0);
4657 }
4658
4659 /*
4660 * Random miscellaneous functions.
4661 */
4662
4663 /*
4664 * Send a PAP or CHAP proto packet.
4665 *
4666 * Varadic function, each of the elements for the ellipsis is of type
4667 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4668 * mlen == 0.
4669 * NOTE: never declare variadic functions with types subject to type
4670 * promotion (i.e. u_char). This is asking for big trouble depending
4671 * on the architecture you are on...
4672 */
4673
4674 static void
sppp_auth_send(const struct cp * cp,struct sppp * sp,unsigned int type,unsigned int id,...)4675 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4676 unsigned int type, unsigned int id,
4677 ...)
4678 {
4679 STDDCL;
4680 struct ppp_header *h;
4681 struct lcp_header *lh;
4682 struct mbuf *m;
4683 u_char *p;
4684 int len;
4685 unsigned int mlen;
4686 const char *msg;
4687 va_list ap;
4688
4689 MGETHDR (m, M_NOWAIT, MT_DATA);
4690 if (! m)
4691 return;
4692 m->m_pkthdr.rcvif = 0;
4693
4694 h = mtod (m, struct ppp_header*);
4695 h->address = PPP_ALLSTATIONS; /* broadcast address */
4696 h->control = PPP_UI; /* Unnumbered Info */
4697 h->protocol = htons(cp->proto);
4698
4699 lh = (struct lcp_header*)(h + 1);
4700 lh->type = type;
4701 lh->ident = id;
4702 p = (u_char*) (lh+1);
4703
4704 va_start(ap, id);
4705 len = 0;
4706
4707 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4708 msg = va_arg(ap, const char *);
4709 len += mlen;
4710 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4711 va_end(ap);
4712 m_freem(m);
4713 return;
4714 }
4715
4716 bcopy(msg, p, mlen);
4717 p += mlen;
4718 }
4719 va_end(ap);
4720
4721 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4722 lh->len = htons (LCP_HEADER_LEN + len);
4723
4724 if (debug) {
4725 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4726 SPP_ARGS(ifp), cp->name,
4727 sppp_auth_type_name(cp->proto, lh->type),
4728 lh->ident, ntohs(lh->len));
4729 sppp_print_bytes((u_char*) (lh+1), len);
4730 log(-1, ">\n");
4731 }
4732 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4733 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4734 }
4735
4736 /*
4737 * Flush interface queue.
4738 */
4739 static void
sppp_qflush(struct ifqueue * ifq)4740 sppp_qflush(struct ifqueue *ifq)
4741 {
4742 struct mbuf *m, *n;
4743
4744 n = ifq->ifq_head;
4745 while ((m = n)) {
4746 n = m->m_nextpkt;
4747 m_freem (m);
4748 }
4749 ifq->ifq_head = 0;
4750 ifq->ifq_tail = 0;
4751 ifq->ifq_len = 0;
4752 }
4753
4754 /*
4755 * Send keepalive packets, every 10 seconds.
4756 */
4757 static void
sppp_keepalive(void * dummy)4758 sppp_keepalive(void *dummy)
4759 {
4760 struct sppp *sp = (struct sppp*)dummy;
4761 struct ifnet *ifp = SP2IFP(sp);
4762
4763 SPPP_LOCK(sp);
4764 /* Keepalive mode disabled or channel down? */
4765 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4766 ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4767 goto out;
4768
4769 if (sp->pp_mode == PP_FR) {
4770 sppp_fr_keepalive (sp);
4771 goto out;
4772 }
4773
4774 /* No keepalive in PPP mode if LCP not opened yet. */
4775 if (sp->pp_mode != IFF_CISCO &&
4776 sp->pp_phase < PHASE_AUTHENTICATE)
4777 goto out;
4778
4779 if (sp->pp_alivecnt == MAXALIVECNT) {
4780 /* No keepalive packets got. Stop the interface. */
4781 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4782 if_down (ifp);
4783 sppp_qflush (&sp->pp_cpq);
4784 if (sp->pp_mode != IFF_CISCO) {
4785 /* XXX */
4786 /* Shut down the PPP link. */
4787 lcp.Down(sp);
4788 /* Initiate negotiation. XXX */
4789 lcp.Up(sp);
4790 }
4791 }
4792 if (sp->pp_alivecnt <= MAXALIVECNT)
4793 ++sp->pp_alivecnt;
4794 if (sp->pp_mode == IFF_CISCO)
4795 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4796 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4797 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4798 uint32_t nmagic = htonl(sp->lcp.magic);
4799 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4800 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4801 sp->lcp.echoid, 4, &nmagic);
4802 }
4803 out:
4804 SPPP_UNLOCK(sp);
4805 callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4806 (void *)sp);
4807 }
4808
4809 /*
4810 * Get both IP addresses.
4811 */
4812 void
sppp_get_ip_addrs(struct sppp * sp,u_long * src,u_long * dst,u_long * srcmask)4813 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4814 {
4815 struct epoch_tracker et;
4816 struct ifnet *ifp = SP2IFP(sp);
4817 struct ifaddr *ifa;
4818 struct sockaddr_in *si, *sm;
4819 u_long ssrc, ddst;
4820
4821 sm = NULL;
4822 ssrc = ddst = 0L;
4823 /*
4824 * Pick the first AF_INET address from the list,
4825 * aliases don't make any sense on a p2p link anyway.
4826 */
4827 si = NULL;
4828 NET_EPOCH_ENTER(et);
4829 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4830 if (ifa->ifa_addr->sa_family == AF_INET) {
4831 si = (struct sockaddr_in *)ifa->ifa_addr;
4832 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4833 if (si)
4834 break;
4835 }
4836 if (ifa) {
4837 if (si && si->sin_addr.s_addr) {
4838 ssrc = si->sin_addr.s_addr;
4839 if (srcmask)
4840 *srcmask = ntohl(sm->sin_addr.s_addr);
4841 }
4842
4843 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4844 if (si && si->sin_addr.s_addr)
4845 ddst = si->sin_addr.s_addr;
4846 }
4847 NET_EPOCH_EXIT(et);
4848
4849 if (dst) *dst = ntohl(ddst);
4850 if (src) *src = ntohl(ssrc);
4851 }
4852
4853 #ifdef INET
4854 /*
4855 * Set my IP address.
4856 */
4857 static void
sppp_set_ip_addr(struct sppp * sp,u_long src)4858 sppp_set_ip_addr(struct sppp *sp, u_long src)
4859 {
4860 STDDCL;
4861 struct epoch_tracker et;
4862 struct ifaddr *ifa;
4863 struct sockaddr_in *si;
4864 struct in_ifaddr *ia;
4865
4866 /*
4867 * Pick the first AF_INET address from the list,
4868 * aliases don't make any sense on a p2p link anyway.
4869 */
4870 si = NULL;
4871 NET_EPOCH_ENTER(et);
4872 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4873 if (ifa->ifa_addr->sa_family == AF_INET) {
4874 si = (struct sockaddr_in *)ifa->ifa_addr;
4875 if (si != NULL) {
4876 ifa_ref(ifa);
4877 break;
4878 }
4879 }
4880 }
4881 NET_EPOCH_EXIT(et);
4882
4883 if (ifa != NULL) {
4884 int error;
4885 int fibnum = ifp->if_fib;
4886
4887 rt_addrmsg(RTM_DELETE, ifa, fibnum);
4888 /* delete old route */
4889 ia = ifatoia(ifa);
4890 error = in_handle_ifaddr_route(RTM_DELETE, ia);
4891 if (debug && error) {
4892 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4893 SPP_ARGS(ifp), error);
4894 }
4895
4896 /* set new address */
4897 si->sin_addr.s_addr = htonl(src);
4898 IN_IFADDR_WLOCK();
4899 LIST_REMOVE(ia, ia_hash);
4900 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4901 IN_IFADDR_WUNLOCK();
4902
4903 rt_addrmsg(RTM_ADD, ifa, fibnum);
4904 /* add new route */
4905 error = in_handle_ifaddr_route(RTM_ADD, ia);
4906 if (debug && error) {
4907 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4908 SPP_ARGS(ifp), error);
4909 }
4910 ifa_free(ifa);
4911 }
4912 }
4913 #endif
4914
4915 #ifdef INET6
4916 /*
4917 * Get both IPv6 addresses.
4918 */
4919 static void
sppp_get_ip6_addrs(struct sppp * sp,struct in6_addr * src,struct in6_addr * dst,struct in6_addr * srcmask)4920 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4921 struct in6_addr *srcmask)
4922 {
4923 struct epoch_tracker et;
4924 struct ifnet *ifp = SP2IFP(sp);
4925 struct ifaddr *ifa;
4926 struct sockaddr_in6 *si, *sm;
4927 struct in6_addr ssrc, ddst;
4928
4929 sm = NULL;
4930 bzero(&ssrc, sizeof(ssrc));
4931 bzero(&ddst, sizeof(ddst));
4932 /*
4933 * Pick the first link-local AF_INET6 address from the list,
4934 * aliases don't make any sense on a p2p link anyway.
4935 */
4936 si = NULL;
4937 NET_EPOCH_ENTER(et);
4938 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4939 if (ifa->ifa_addr->sa_family == AF_INET6) {
4940 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4941 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4942 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4943 break;
4944 }
4945 if (ifa) {
4946 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4947 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4948 if (srcmask) {
4949 bcopy(&sm->sin6_addr, srcmask,
4950 sizeof(*srcmask));
4951 }
4952 }
4953
4954 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4955 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4956 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4957 }
4958
4959 if (dst)
4960 bcopy(&ddst, dst, sizeof(*dst));
4961 if (src)
4962 bcopy(&ssrc, src, sizeof(*src));
4963 NET_EPOCH_EXIT(et);
4964 }
4965
4966 #ifdef IPV6CP_MYIFID_DYN
4967 /*
4968 * Generate random ifid.
4969 */
4970 static void
sppp_gen_ip6_addr(struct sppp * sp,struct in6_addr * addr)4971 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4972 {
4973 /* TBD */
4974 }
4975
4976 /*
4977 * Set my IPv6 address.
4978 */
4979 static void
sppp_set_ip6_addr(struct sppp * sp,const struct in6_addr * src)4980 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4981 {
4982 STDDCL;
4983 struct epoch_tracker et;
4984 struct ifaddr *ifa;
4985 struct sockaddr_in6 *sin6;
4986
4987 /*
4988 * Pick the first link-local AF_INET6 address from the list,
4989 * aliases don't make any sense on a p2p link anyway.
4990 */
4991
4992 sin6 = NULL;
4993 NET_EPOCH_ENTER(et);
4994 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4995 if (ifa->ifa_addr->sa_family == AF_INET6) {
4996 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4997 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
4998 ifa_ref(ifa);
4999 break;
5000 }
5001 }
5002 }
5003 NET_EPOCH_EXIT(et);
5004
5005 if (ifa != NULL) {
5006 int error;
5007 struct sockaddr_in6 new_sin6 = *sin6;
5008
5009 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5010 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5011 if (debug && error) {
5012 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5013 " failed, error=%d\n", SPP_ARGS(ifp), error);
5014 }
5015 ifa_free(ifa);
5016 }
5017 }
5018 #endif
5019
5020 /*
5021 * Suggest a candidate address to be used by peer.
5022 */
5023 static void
sppp_suggest_ip6_addr(struct sppp * sp,struct in6_addr * suggest)5024 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5025 {
5026 struct in6_addr myaddr;
5027 struct timeval tv;
5028
5029 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5030
5031 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
5032 microtime(&tv);
5033 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5034 myaddr.s6_addr[14] ^= 0xff;
5035 myaddr.s6_addr[15] ^= 0xff;
5036 } else {
5037 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5038 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5039 }
5040 if (suggest)
5041 bcopy(&myaddr, suggest, sizeof(myaddr));
5042 }
5043 #endif /*INET6*/
5044
5045 static int
sppp_params(struct sppp * sp,u_long cmd,void * data)5046 sppp_params(struct sppp *sp, u_long cmd, void *data)
5047 {
5048 u_long subcmd;
5049 struct ifreq *ifr = (struct ifreq *)data;
5050 struct spppreq *spr;
5051 int rv = 0;
5052
5053 if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == NULL)
5054 return (EAGAIN);
5055 /*
5056 * ifr_data_get_ptr(ifr) is supposed to point to a struct spppreq.
5057 * Check the cmd word first before attempting to fetch all the
5058 * data.
5059 */
5060 rv = fueword(ifr_data_get_ptr(ifr), &subcmd);
5061 if (rv == -1) {
5062 rv = EFAULT;
5063 goto quit;
5064 }
5065
5066 if (copyin(ifr_data_get_ptr(ifr), spr, sizeof(struct spppreq)) != 0) {
5067 rv = EFAULT;
5068 goto quit;
5069 }
5070
5071 switch (subcmd) {
5072 case (u_long)SPPPIOGDEFS:
5073 if (cmd != SIOCGIFGENERIC) {
5074 rv = EINVAL;
5075 break;
5076 }
5077 /*
5078 * We copy over the entire current state, but clean
5079 * out some of the stuff we don't wanna pass up.
5080 * Remember, SIOCGIFGENERIC is unprotected, and can be
5081 * called by any user. No need to ever get PAP or
5082 * CHAP secrets back to userland anyway.
5083 */
5084 spr->defs.pp_phase = sp->pp_phase;
5085 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5086 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5087 spr->defs.lcp = sp->lcp;
5088 spr->defs.ipcp = sp->ipcp;
5089 spr->defs.ipv6cp = sp->ipv6cp;
5090 spr->defs.myauth = sp->myauth;
5091 spr->defs.hisauth = sp->hisauth;
5092 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5093 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5094 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5095 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5096 /*
5097 * Fixup the LCP timeout value to milliseconds so
5098 * spppcontrol doesn't need to bother about the value
5099 * of "hz". We do the reverse calculation below when
5100 * setting it.
5101 */
5102 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5103 rv = copyout(spr, ifr_data_get_ptr(ifr),
5104 sizeof(struct spppreq));
5105 break;
5106
5107 case (u_long)SPPPIOSDEFS:
5108 if (cmd != SIOCSIFGENERIC) {
5109 rv = EINVAL;
5110 break;
5111 }
5112 /*
5113 * We have a very specific idea of which fields we
5114 * allow being passed back from userland, so to not
5115 * clobber our current state. For one, we only allow
5116 * setting anything if LCP is in dead or establish
5117 * phase. Once the authentication negotiations
5118 * started, the authentication settings must not be
5119 * changed again. (The administrator can force an
5120 * ifconfig down in order to get LCP back into dead
5121 * phase.)
5122 *
5123 * Also, we only allow for authentication parameters to be
5124 * specified.
5125 *
5126 * XXX Should allow to set or clear pp_flags.
5127 *
5128 * Finally, if the respective authentication protocol to
5129 * be used is set differently than 0, but the secret is
5130 * passed as all zeros, we don't trash the existing secret.
5131 * This allows an administrator to change the system name
5132 * only without clobbering the secret (which he didn't get
5133 * back in a previous SPPPIOGDEFS call). However, the
5134 * secrets are cleared if the authentication protocol is
5135 * reset to 0. */
5136 if (sp->pp_phase != PHASE_DEAD &&
5137 sp->pp_phase != PHASE_ESTABLISH) {
5138 rv = EBUSY;
5139 break;
5140 }
5141
5142 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5143 spr->defs.myauth.proto != PPP_CHAP) ||
5144 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5145 spr->defs.hisauth.proto != PPP_CHAP)) {
5146 rv = EINVAL;
5147 break;
5148 }
5149
5150 if (spr->defs.myauth.proto == 0)
5151 /* resetting myauth */
5152 bzero(&sp->myauth, sizeof sp->myauth);
5153 else {
5154 /* setting/changing myauth */
5155 sp->myauth.proto = spr->defs.myauth.proto;
5156 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5157 if (spr->defs.myauth.secret[0] != '\0')
5158 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5159 AUTHKEYLEN);
5160 }
5161 if (spr->defs.hisauth.proto == 0)
5162 /* resetting hisauth */
5163 bzero(&sp->hisauth, sizeof sp->hisauth);
5164 else {
5165 /* setting/changing hisauth */
5166 sp->hisauth.proto = spr->defs.hisauth.proto;
5167 sp->hisauth.flags = spr->defs.hisauth.flags;
5168 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5169 if (spr->defs.hisauth.secret[0] != '\0')
5170 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5171 AUTHKEYLEN);
5172 }
5173 /* set LCP restart timer timeout */
5174 if (spr->defs.lcp.timeout != 0)
5175 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5176 /* set VJ enable and IPv6 disable flags */
5177 #ifdef INET
5178 if (spr->defs.enable_vj)
5179 sp->confflags |= CONF_ENABLE_VJ;
5180 else
5181 sp->confflags &= ~CONF_ENABLE_VJ;
5182 #endif
5183 #ifdef INET6
5184 if (spr->defs.enable_ipv6)
5185 sp->confflags |= CONF_ENABLE_IPV6;
5186 else
5187 sp->confflags &= ~CONF_ENABLE_IPV6;
5188 #endif
5189 break;
5190
5191 default:
5192 rv = EINVAL;
5193 }
5194
5195 quit:
5196 free(spr, M_TEMP);
5197
5198 return (rv);
5199 }
5200
5201 static void
sppp_phase_network(struct sppp * sp)5202 sppp_phase_network(struct sppp *sp)
5203 {
5204 STDDCL;
5205 int i;
5206 u_long mask;
5207
5208 sp->pp_phase = PHASE_NETWORK;
5209
5210 if (debug)
5211 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5212 sppp_phase_name(sp->pp_phase));
5213
5214 /* Notify NCPs now. */
5215 for (i = 0; i < IDX_COUNT; i++)
5216 if ((cps[i])->flags & CP_NCP)
5217 (cps[i])->Open(sp);
5218
5219 /* Send Up events to all NCPs. */
5220 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5221 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5222 (cps[i])->Up(sp);
5223
5224 /* if no NCP is starting, all this was in vain, close down */
5225 sppp_lcp_check_and_close(sp);
5226 }
5227
5228 static const char *
sppp_cp_type_name(u_char type)5229 sppp_cp_type_name(u_char type)
5230 {
5231 static char buf[12];
5232 switch (type) {
5233 case CONF_REQ: return "conf-req";
5234 case CONF_ACK: return "conf-ack";
5235 case CONF_NAK: return "conf-nak";
5236 case CONF_REJ: return "conf-rej";
5237 case TERM_REQ: return "term-req";
5238 case TERM_ACK: return "term-ack";
5239 case CODE_REJ: return "code-rej";
5240 case PROTO_REJ: return "proto-rej";
5241 case ECHO_REQ: return "echo-req";
5242 case ECHO_REPLY: return "echo-reply";
5243 case DISC_REQ: return "discard-req";
5244 }
5245 snprintf (buf, sizeof(buf), "cp/0x%x", type);
5246 return buf;
5247 }
5248
5249 static const char *
sppp_auth_type_name(u_short proto,u_char type)5250 sppp_auth_type_name(u_short proto, u_char type)
5251 {
5252 static char buf[12];
5253 switch (proto) {
5254 case PPP_CHAP:
5255 switch (type) {
5256 case CHAP_CHALLENGE: return "challenge";
5257 case CHAP_RESPONSE: return "response";
5258 case CHAP_SUCCESS: return "success";
5259 case CHAP_FAILURE: return "failure";
5260 }
5261 case PPP_PAP:
5262 switch (type) {
5263 case PAP_REQ: return "req";
5264 case PAP_ACK: return "ack";
5265 case PAP_NAK: return "nak";
5266 }
5267 }
5268 snprintf (buf, sizeof(buf), "auth/0x%x", type);
5269 return buf;
5270 }
5271
5272 static const char *
sppp_lcp_opt_name(u_char opt)5273 sppp_lcp_opt_name(u_char opt)
5274 {
5275 static char buf[12];
5276 switch (opt) {
5277 case LCP_OPT_MRU: return "mru";
5278 case LCP_OPT_ASYNC_MAP: return "async-map";
5279 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5280 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5281 case LCP_OPT_MAGIC: return "magic";
5282 case LCP_OPT_PROTO_COMP: return "proto-comp";
5283 case LCP_OPT_ADDR_COMP: return "addr-comp";
5284 }
5285 snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5286 return buf;
5287 }
5288
5289 #ifdef INET
5290 static const char *
sppp_ipcp_opt_name(u_char opt)5291 sppp_ipcp_opt_name(u_char opt)
5292 {
5293 static char buf[12];
5294 switch (opt) {
5295 case IPCP_OPT_ADDRESSES: return "addresses";
5296 case IPCP_OPT_COMPRESSION: return "compression";
5297 case IPCP_OPT_ADDRESS: return "address";
5298 }
5299 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5300 return buf;
5301 }
5302 #endif
5303
5304 #ifdef INET6
5305 static const char *
sppp_ipv6cp_opt_name(u_char opt)5306 sppp_ipv6cp_opt_name(u_char opt)
5307 {
5308 static char buf[12];
5309 switch (opt) {
5310 case IPV6CP_OPT_IFID: return "ifid";
5311 case IPV6CP_OPT_COMPRESSION: return "compression";
5312 }
5313 sprintf (buf, "0x%x", opt);
5314 return buf;
5315 }
5316 #endif
5317
5318 static const char *
sppp_state_name(int state)5319 sppp_state_name(int state)
5320 {
5321 switch (state) {
5322 case STATE_INITIAL: return "initial";
5323 case STATE_STARTING: return "starting";
5324 case STATE_CLOSED: return "closed";
5325 case STATE_STOPPED: return "stopped";
5326 case STATE_CLOSING: return "closing";
5327 case STATE_STOPPING: return "stopping";
5328 case STATE_REQ_SENT: return "req-sent";
5329 case STATE_ACK_RCVD: return "ack-rcvd";
5330 case STATE_ACK_SENT: return "ack-sent";
5331 case STATE_OPENED: return "opened";
5332 }
5333 return "illegal";
5334 }
5335
5336 static const char *
sppp_phase_name(enum ppp_phase phase)5337 sppp_phase_name(enum ppp_phase phase)
5338 {
5339 switch (phase) {
5340 case PHASE_DEAD: return "dead";
5341 case PHASE_ESTABLISH: return "establish";
5342 case PHASE_TERMINATE: return "terminate";
5343 case PHASE_AUTHENTICATE: return "authenticate";
5344 case PHASE_NETWORK: return "network";
5345 }
5346 return "illegal";
5347 }
5348
5349 static const char *
sppp_proto_name(u_short proto)5350 sppp_proto_name(u_short proto)
5351 {
5352 static char buf[12];
5353 switch (proto) {
5354 case PPP_LCP: return "lcp";
5355 case PPP_IPCP: return "ipcp";
5356 case PPP_PAP: return "pap";
5357 case PPP_CHAP: return "chap";
5358 case PPP_IPV6CP: return "ipv6cp";
5359 }
5360 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5361 return buf;
5362 }
5363
5364 static void
sppp_print_bytes(const u_char * p,u_short len)5365 sppp_print_bytes(const u_char *p, u_short len)
5366 {
5367 #ifndef FSTACK
5368 if (len)
5369 log(-1, " %*D", len, p, "-");
5370 #endif
5371 }
5372
5373 static void
sppp_print_string(const char * p,u_short len)5374 sppp_print_string(const char *p, u_short len)
5375 {
5376 u_char c;
5377
5378 while (len-- > 0) {
5379 c = *p++;
5380 /*
5381 * Print only ASCII chars directly. RFC 1994 recommends
5382 * using only them, but we don't rely on it. */
5383 if (c < ' ' || c > '~')
5384 log(-1, "\\x%x", c);
5385 else
5386 log(-1, "%c", c);
5387 }
5388 }
5389
5390 #ifdef INET
5391 static const char *
sppp_dotted_quad(u_long addr)5392 sppp_dotted_quad(u_long addr)
5393 {
5394 static char s[16];
5395 sprintf(s, "%d.%d.%d.%d",
5396 (int)((addr >> 24) & 0xff),
5397 (int)((addr >> 16) & 0xff),
5398 (int)((addr >> 8) & 0xff),
5399 (int)(addr & 0xff));
5400 return s;
5401 }
5402 #endif
5403
5404 static int
sppp_strnlen(u_char * p,int max)5405 sppp_strnlen(u_char *p, int max)
5406 {
5407 int len;
5408
5409 for (len = 0; len < max && *p; ++p)
5410 ++len;
5411 return len;
5412 }
5413
5414 /* a dummy, used to drop uninteresting events */
5415 static void
sppp_null(struct sppp * unused)5416 sppp_null(struct sppp *unused)
5417 {
5418 /* do just nothing */
5419 }
5420