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, <vak@cronyx.ru>
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_systm.h>
51 #include <netinet/ip.h>
52 #include <net/slcompress.h>
53
54 #include <machine/stdarg.h>
55
56 #include <netinet/in_var.h>
57
58 #ifdef INET
59 #include <netinet/ip.h>
60 #include <netinet/tcp.h>
61 #endif
62
63 #ifdef INET6
64 #include <netinet6/scope6_var.h>
65 #endif
66
67 #include <netinet/if_ether.h>
68
69 #include <net/if_sppp.h>
70
71 #define IOCTL_CMD_T u_long
72 #define MAXALIVECNT 3 /* max. alive packets */
73
74 /*
75 * Interface flags that can be set in an ifconfig command.
76 *
77 * Setting link0 will make the link passive, i.e. it will be marked
78 * as being administrative openable, but won't be opened to begin
79 * with. Incoming calls will be answered, or subsequent calls with
80 * -link1 will cause the administrative open of the LCP layer.
81 *
82 * Setting link1 will cause the link to auto-dial only as packets
83 * arrive to be sent.
84 *
85 * Setting IFF_DEBUG will syslog the option negotiation and state
86 * transitions at level kern.debug. Note: all logs consistently look
87 * like
88 *
89 * <if-name><unit>: <proto-name> <additional info...>
90 *
91 * with <if-name><unit> being something like "bppp0", and <proto-name>
92 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
93 */
94
95 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
96 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */
97 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */
98
99 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
100 #define PPP_UI 0x03 /* Unnumbered Information */
101 #define PPP_IP 0x0021 /* Internet Protocol */
102 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
103 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
104 #define PPP_IPX 0x002b /* Novell IPX Protocol */
105 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */
106 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */
107 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */
108 #define PPP_LCP 0xc021 /* Link Control Protocol */
109 #define PPP_PAP 0xc023 /* Password Authentication Protocol */
110 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
111 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
112 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
113
114 #define CONF_REQ 1 /* PPP configure request */
115 #define CONF_ACK 2 /* PPP configure acknowledge */
116 #define CONF_NAK 3 /* PPP configure negative ack */
117 #define CONF_REJ 4 /* PPP configure reject */
118 #define TERM_REQ 5 /* PPP terminate request */
119 #define TERM_ACK 6 /* PPP terminate acknowledge */
120 #define CODE_REJ 7 /* PPP code reject */
121 #define PROTO_REJ 8 /* PPP protocol reject */
122 #define ECHO_REQ 9 /* PPP echo request */
123 #define ECHO_REPLY 10 /* PPP echo reply */
124 #define DISC_REQ 11 /* PPP discard request */
125
126 #define LCP_OPT_MRU 1 /* maximum receive unit */
127 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
128 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
129 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
130 #define LCP_OPT_MAGIC 5 /* magic number */
131 #define LCP_OPT_RESERVED 6 /* reserved */
132 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
133 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
134
135 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
136 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
137 #define IPCP_OPT_ADDRESS 3 /* local IP address */
138
139 #define IPV6CP_OPT_IFID 1 /* interface identifier */
140 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
141
142 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */
143
144 #define PAP_REQ 1 /* PAP name/password request */
145 #define PAP_ACK 2 /* PAP acknowledge */
146 #define PAP_NAK 3 /* PAP fail */
147
148 #define CHAP_CHALLENGE 1 /* CHAP challenge request */
149 #define CHAP_RESPONSE 2 /* CHAP challenge response */
150 #define CHAP_SUCCESS 3 /* CHAP response ok */
151 #define CHAP_FAILURE 4 /* CHAP response failed */
152
153 #define CHAP_MD5 5 /* hash algorithm - MD5 */
154
155 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
156 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
157 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
158 #define CISCO_ADDR_REQ 0 /* Cisco address request */
159 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
160 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
161
162 /* states are named and numbered according to RFC 1661 */
163 #define STATE_INITIAL 0
164 #define STATE_STARTING 1
165 #define STATE_CLOSED 2
166 #define STATE_STOPPED 3
167 #define STATE_CLOSING 4
168 #define STATE_STOPPING 5
169 #define STATE_REQ_SENT 6
170 #define STATE_ACK_RCVD 7
171 #define STATE_ACK_SENT 8
172 #define STATE_OPENED 9
173
174 static MALLOC_DEFINE(M_SPPP, "sppp", "synchronous PPP interface internals");
175
176 struct ppp_header {
177 u_char address;
178 u_char control;
179 u_short protocol;
180 } __packed;
181 #define PPP_HEADER_LEN sizeof (struct ppp_header)
182
183 struct lcp_header {
184 u_char type;
185 u_char ident;
186 u_short len;
187 } __packed;
188 #define LCP_HEADER_LEN sizeof (struct lcp_header)
189
190 struct cisco_packet {
191 u_long type;
192 u_long par1;
193 u_long par2;
194 u_short rel;
195 u_short time0;
196 u_short time1;
197 } __packed;
198 #define CISCO_PACKET_LEN sizeof (struct cisco_packet)
199
200 /*
201 * We follow the spelling and capitalization of RFC 1661 here, to make
202 * it easier comparing with the standard. Please refer to this RFC in
203 * case you can't make sense out of these abbreviation; it will also
204 * explain the semantics related to the various events and actions.
205 */
206 struct cp {
207 u_short proto; /* PPP control protocol number */
208 u_char protoidx; /* index into state table in struct sppp */
209 u_char flags;
210 #define CP_LCP 0x01 /* this is the LCP */
211 #define CP_AUTH 0x02 /* this is an authentication protocol */
212 #define CP_NCP 0x04 /* this is a NCP */
213 #define CP_QUAL 0x08 /* this is a quality reporting protocol */
214 const char *name; /* name of this control protocol */
215 /* event handlers */
216 void (*Up)(struct sppp *sp);
217 void (*Down)(struct sppp *sp);
218 void (*Open)(struct sppp *sp);
219 void (*Close)(struct sppp *sp);
220 void (*TO)(void *sp);
221 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
222 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
223 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
224 /* actions */
225 void (*tlu)(struct sppp *sp);
226 void (*tld)(struct sppp *sp);
227 void (*tls)(struct sppp *sp);
228 void (*tlf)(struct sppp *sp);
229 void (*scr)(struct sppp *sp);
230 };
231
232 #define SPP_FMT "%s: "
233 #define SPP_ARGS(ifp) (ifp)->if_xname
234
235 #define SPPP_LOCK(sp) mtx_lock (&(sp)->mtx)
236 #define SPPP_UNLOCK(sp) mtx_unlock (&(sp)->mtx)
237 #define SPPP_LOCK_ASSERT(sp) mtx_assert (&(sp)->mtx, MA_OWNED)
238 #define SPPP_LOCK_OWNED(sp) mtx_owned (&(sp)->mtx)
239
240 #ifdef INET
241 /*
242 * The following disgusting hack gets around the problem that IP TOS
243 * can't be set yet. We want to put "interactive" traffic on a high
244 * priority queue. To decide if traffic is interactive, we check that
245 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
246 *
247 * XXX is this really still necessary? - joerg -
248 */
249 static const u_short interactive_ports[8] = {
250 0, 513, 0, 0,
251 0, 21, 0, 23,
252 };
253 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
254 #endif
255
256 /* almost every function needs these */
257 #define STDDCL \
258 struct ifnet *ifp = SP2IFP(sp); \
259 int debug = ifp->if_flags & IFF_DEBUG
260
261 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
262 const struct sockaddr *dst, struct route *ro);
263
264 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
265 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
266
267 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
268 struct mbuf *m);
269 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
270 u_char ident, u_short len, void *data);
271 /* static void sppp_cp_timeout(void *arg); */
272 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
273 int newstate);
274 static void sppp_auth_send(const struct cp *cp,
275 struct sppp *sp, unsigned int type, unsigned int id,
276 ...);
277
278 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
279 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
280 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
281 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
282 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
283
284 static void sppp_null(struct sppp *sp);
285
286 static void sppp_pp_up(struct sppp *sp);
287 static void sppp_pp_down(struct sppp *sp);
288
289 static void sppp_lcp_init(struct sppp *sp);
290 static void sppp_lcp_up(struct sppp *sp);
291 static void sppp_lcp_down(struct sppp *sp);
292 static void sppp_lcp_open(struct sppp *sp);
293 static void sppp_lcp_close(struct sppp *sp);
294 static void sppp_lcp_TO(void *sp);
295 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
296 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
297 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
298 static void sppp_lcp_tlu(struct sppp *sp);
299 static void sppp_lcp_tld(struct sppp *sp);
300 static void sppp_lcp_tls(struct sppp *sp);
301 static void sppp_lcp_tlf(struct sppp *sp);
302 static void sppp_lcp_scr(struct sppp *sp);
303 static void sppp_lcp_check_and_close(struct sppp *sp);
304 static int sppp_ncp_check(struct sppp *sp);
305
306 static void sppp_ipcp_init(struct sppp *sp);
307 static void sppp_ipcp_up(struct sppp *sp);
308 static void sppp_ipcp_down(struct sppp *sp);
309 static void sppp_ipcp_open(struct sppp *sp);
310 static void sppp_ipcp_close(struct sppp *sp);
311 static void sppp_ipcp_TO(void *sp);
312 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
313 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
314 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
315 static void sppp_ipcp_tlu(struct sppp *sp);
316 static void sppp_ipcp_tld(struct sppp *sp);
317 static void sppp_ipcp_tls(struct sppp *sp);
318 static void sppp_ipcp_tlf(struct sppp *sp);
319 static void sppp_ipcp_scr(struct sppp *sp);
320
321 static void sppp_ipv6cp_init(struct sppp *sp);
322 static void sppp_ipv6cp_up(struct sppp *sp);
323 static void sppp_ipv6cp_down(struct sppp *sp);
324 static void sppp_ipv6cp_open(struct sppp *sp);
325 static void sppp_ipv6cp_close(struct sppp *sp);
326 static void sppp_ipv6cp_TO(void *sp);
327 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
328 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
329 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
330 static void sppp_ipv6cp_tlu(struct sppp *sp);
331 static void sppp_ipv6cp_tld(struct sppp *sp);
332 static void sppp_ipv6cp_tls(struct sppp *sp);
333 static void sppp_ipv6cp_tlf(struct sppp *sp);
334 static void sppp_ipv6cp_scr(struct sppp *sp);
335
336 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
337 static void sppp_pap_init(struct sppp *sp);
338 static void sppp_pap_open(struct sppp *sp);
339 static void sppp_pap_close(struct sppp *sp);
340 static void sppp_pap_TO(void *sp);
341 static void sppp_pap_my_TO(void *sp);
342 static void sppp_pap_tlu(struct sppp *sp);
343 static void sppp_pap_tld(struct sppp *sp);
344 static void sppp_pap_scr(struct sppp *sp);
345
346 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
347 static void sppp_chap_init(struct sppp *sp);
348 static void sppp_chap_open(struct sppp *sp);
349 static void sppp_chap_close(struct sppp *sp);
350 static void sppp_chap_TO(void *sp);
351 static void sppp_chap_tlu(struct sppp *sp);
352 static void sppp_chap_tld(struct sppp *sp);
353 static void sppp_chap_scr(struct sppp *sp);
354
355 static const char *sppp_auth_type_name(u_short proto, u_char type);
356 static const char *sppp_cp_type_name(u_char type);
357 #ifdef INET
358 static const char *sppp_dotted_quad(u_long addr);
359 static const char *sppp_ipcp_opt_name(u_char opt);
360 #endif
361 #ifdef INET6
362 static const char *sppp_ipv6cp_opt_name(u_char opt);
363 #endif
364 static const char *sppp_lcp_opt_name(u_char opt);
365 static const char *sppp_phase_name(enum ppp_phase phase);
366 static const char *sppp_proto_name(u_short proto);
367 static const char *sppp_state_name(int state);
368 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
369 static int sppp_strnlen(u_char *p, int max);
370 static void sppp_keepalive(void *dummy);
371 static void sppp_phase_network(struct sppp *sp);
372 static void sppp_print_bytes(const u_char *p, u_short len);
373 static void sppp_print_string(const char *p, u_short len);
374 static void sppp_qflush(struct ifqueue *ifq);
375 #ifdef INET
376 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
377 #endif
378 #ifdef INET6
379 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
380 struct in6_addr *dst, struct in6_addr *srcmask);
381 #ifdef IPV6CP_MYIFID_DYN
382 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
383 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
384 #endif
385 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
386 #endif
387
388 /* if_start () wrapper */
389 static void sppp_ifstart (struct ifnet *ifp);
390
391 /* our control protocol descriptors */
392 static const struct cp lcp = {
393 PPP_LCP, IDX_LCP, CP_LCP, "lcp",
394 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
395 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
396 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
397 sppp_lcp_scr
398 };
399
400 static const struct cp ipcp = {
401 PPP_IPCP, IDX_IPCP,
402 #ifdef INET /* don't run IPCP if there's no IPv4 support */
403 CP_NCP,
404 #else
405 0,
406 #endif
407 "ipcp",
408 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
409 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
410 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
411 sppp_ipcp_scr
412 };
413
414 static const struct cp ipv6cp = {
415 PPP_IPV6CP, IDX_IPV6CP,
416 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
417 CP_NCP,
418 #else
419 0,
420 #endif
421 "ipv6cp",
422 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
423 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
424 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
425 sppp_ipv6cp_scr
426 };
427
428 static const struct cp pap = {
429 PPP_PAP, IDX_PAP, CP_AUTH, "pap",
430 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
431 sppp_pap_TO, 0, 0, 0,
432 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
433 sppp_pap_scr
434 };
435
436 static const struct cp chap = {
437 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
438 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
439 sppp_chap_TO, 0, 0, 0,
440 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
441 sppp_chap_scr
442 };
443
444 static const struct cp *cps[IDX_COUNT] = {
445 &lcp, /* IDX_LCP */
446 &ipcp, /* IDX_IPCP */
447 &ipv6cp, /* IDX_IPV6CP */
448 &pap, /* IDX_PAP */
449 &chap, /* IDX_CHAP */
450 };
451
452 static void*
sppp_alloc(u_char type,struct ifnet * ifp)453 sppp_alloc(u_char type, struct ifnet *ifp)
454 {
455 struct sppp *sp;
456
457 sp = malloc(sizeof(struct sppp), M_SPPP, M_WAITOK | M_ZERO);
458 sp->pp_ifp = ifp;
459
460 return (sp);
461 }
462
463 static void
sppp_free(void * com,u_char type)464 sppp_free(void *com, u_char type)
465 {
466
467 free(com, M_SPPP);
468 }
469
470 static int
sppp_modevent(module_t mod,int type,void * unused)471 sppp_modevent(module_t mod, int type, void *unused)
472 {
473 switch (type) {
474 case MOD_LOAD:
475 /*
476 * XXX: should probably be IFT_SPPP, but it's fairly
477 * harmless to allocate struct sppp's for non-sppp
478 * interfaces.
479 */
480
481 if_register_com_alloc(IFT_PPP, sppp_alloc, sppp_free);
482 break;
483 case MOD_UNLOAD:
484 /* if_deregister_com_alloc(IFT_PPP); */
485 return EACCES;
486 default:
487 return EOPNOTSUPP;
488 }
489 return 0;
490 }
491 static moduledata_t spppmod = {
492 "sppp",
493 sppp_modevent,
494 0
495 };
496 MODULE_VERSION(sppp, 1);
497 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
498
499 /*
500 * Exported functions, comprising our interface to the lower layer.
501 */
502
503 /*
504 * Process the received packet.
505 */
506 void
sppp_input(struct ifnet * ifp,struct mbuf * m)507 sppp_input(struct ifnet *ifp, struct mbuf *m)
508 {
509 struct ppp_header *h;
510 int isr = -1;
511 struct sppp *sp = IFP2SP(ifp);
512 int debug, do_account = 0;
513 #ifdef INET
514 int hlen, vjlen;
515 u_char *iphdr;
516 #endif
517
518 SPPP_LOCK(sp);
519 debug = ifp->if_flags & IFF_DEBUG;
520
521 if (ifp->if_flags & IFF_UP)
522 /* Count received bytes, add FCS and one flag */
523 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len + 3);
524
525 if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
526 /* Too small packet, drop it. */
527 if (debug)
528 log(LOG_DEBUG,
529 SPP_FMT "input packet is too small, %d bytes\n",
530 SPP_ARGS(ifp), m->m_pkthdr.len);
531 drop:
532 m_freem (m);
533 SPPP_UNLOCK(sp);
534 drop2:
535 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
536 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
537 return;
538 }
539
540 if (sp->pp_mode == PP_FR) {
541 sppp_fr_input (sp, m);
542 SPPP_UNLOCK(sp);
543 return;
544 }
545
546 /* Get PPP header. */
547 h = mtod (m, struct ppp_header*);
548 m_adj (m, PPP_HEADER_LEN);
549
550 switch (h->address) {
551 case PPP_ALLSTATIONS:
552 if (h->control != PPP_UI)
553 goto invalid;
554 if (sp->pp_mode == IFF_CISCO) {
555 if (debug)
556 log(LOG_DEBUG,
557 SPP_FMT "PPP packet in Cisco mode "
558 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
559 SPP_ARGS(ifp),
560 h->address, h->control, ntohs(h->protocol));
561 goto drop;
562 }
563 switch (ntohs (h->protocol)) {
564 default:
565 if (debug)
566 log(LOG_DEBUG,
567 SPP_FMT "rejecting protocol "
568 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
569 SPP_ARGS(ifp),
570 h->address, h->control, ntohs(h->protocol));
571 if (sp->state[IDX_LCP] == STATE_OPENED)
572 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
573 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
574 &h->protocol);
575 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
576 goto drop;
577 case PPP_LCP:
578 sppp_cp_input(&lcp, sp, m);
579 m_freem (m);
580 SPPP_UNLOCK(sp);
581 return;
582 case PPP_PAP:
583 if (sp->pp_phase >= PHASE_AUTHENTICATE)
584 sppp_pap_input(sp, m);
585 m_freem (m);
586 SPPP_UNLOCK(sp);
587 return;
588 case PPP_CHAP:
589 if (sp->pp_phase >= PHASE_AUTHENTICATE)
590 sppp_chap_input(sp, m);
591 m_freem (m);
592 SPPP_UNLOCK(sp);
593 return;
594 #ifdef INET
595 case PPP_IPCP:
596 if (sp->pp_phase == PHASE_NETWORK)
597 sppp_cp_input(&ipcp, sp, m);
598 m_freem (m);
599 SPPP_UNLOCK(sp);
600 return;
601 case PPP_IP:
602 if (sp->state[IDX_IPCP] == STATE_OPENED) {
603 isr = NETISR_IP;
604 }
605 do_account++;
606 break;
607 case PPP_VJ_COMP:
608 if (sp->state[IDX_IPCP] == STATE_OPENED) {
609 if ((vjlen =
610 sl_uncompress_tcp_core(mtod(m, u_char *),
611 m->m_len, m->m_len,
612 TYPE_COMPRESSED_TCP,
613 sp->pp_comp,
614 &iphdr, &hlen)) <= 0) {
615 if (debug)
616 log(LOG_INFO,
617 SPP_FMT "VJ uncompress failed on compressed packet\n",
618 SPP_ARGS(ifp));
619 goto drop;
620 }
621
622 /*
623 * Trim the VJ header off the packet, and prepend
624 * the uncompressed IP header (which will usually
625 * end up in two chained mbufs since there's not
626 * enough leading space in the existing mbuf).
627 */
628 m_adj(m, vjlen);
629 M_PREPEND(m, hlen, M_NOWAIT);
630 if (m == NULL) {
631 SPPP_UNLOCK(sp);
632 goto drop2;
633 }
634 bcopy(iphdr, mtod(m, u_char *), hlen);
635 isr = NETISR_IP;
636 }
637 do_account++;
638 break;
639 case PPP_VJ_UCOMP:
640 if (sp->state[IDX_IPCP] == STATE_OPENED) {
641 if (sl_uncompress_tcp_core(mtod(m, u_char *),
642 m->m_len, m->m_len,
643 TYPE_UNCOMPRESSED_TCP,
644 sp->pp_comp,
645 &iphdr, &hlen) != 0) {
646 if (debug)
647 log(LOG_INFO,
648 SPP_FMT "VJ uncompress failed on uncompressed packet\n",
649 SPP_ARGS(ifp));
650 goto drop;
651 }
652 isr = NETISR_IP;
653 }
654 do_account++;
655 break;
656 #endif
657 #ifdef INET6
658 case PPP_IPV6CP:
659 if (sp->pp_phase == PHASE_NETWORK)
660 sppp_cp_input(&ipv6cp, sp, m);
661 m_freem (m);
662 SPPP_UNLOCK(sp);
663 return;
664
665 case PPP_IPV6:
666 if (sp->state[IDX_IPV6CP] == STATE_OPENED)
667 isr = NETISR_IPV6;
668 do_account++;
669 break;
670 #endif
671 }
672 break;
673 case CISCO_MULTICAST:
674 case CISCO_UNICAST:
675 /* Don't check the control field here (RFC 1547). */
676 if (sp->pp_mode != IFF_CISCO) {
677 if (debug)
678 log(LOG_DEBUG,
679 SPP_FMT "Cisco packet in PPP mode "
680 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
681 SPP_ARGS(ifp),
682 h->address, h->control, ntohs(h->protocol));
683 goto drop;
684 }
685 switch (ntohs (h->protocol)) {
686 default:
687 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
688 goto invalid;
689 case CISCO_KEEPALIVE:
690 sppp_cisco_input (sp, m);
691 m_freem (m);
692 SPPP_UNLOCK(sp);
693 return;
694 #ifdef INET
695 case ETHERTYPE_IP:
696 isr = NETISR_IP;
697 do_account++;
698 break;
699 #endif
700 #ifdef INET6
701 case ETHERTYPE_IPV6:
702 isr = NETISR_IPV6;
703 do_account++;
704 break;
705 #endif
706 }
707 break;
708 default: /* Invalid PPP packet. */
709 invalid:
710 if (debug)
711 log(LOG_DEBUG,
712 SPP_FMT "invalid input packet "
713 "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
714 SPP_ARGS(ifp),
715 h->address, h->control, ntohs(h->protocol));
716 goto drop;
717 }
718
719 if (! (ifp->if_flags & IFF_UP) || isr == -1)
720 goto drop;
721
722 SPPP_UNLOCK(sp);
723 M_SETFIB(m, ifp->if_fib);
724 /* Check queue. */
725 if (netisr_queue(isr, m)) { /* (0) on success. */
726 if (debug)
727 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
728 SPP_ARGS(ifp));
729 goto drop2;
730 }
731
732 if (do_account)
733 /*
734 * Do only account for network packets, not for control
735 * packets. This is used by some subsystems to detect
736 * idle lines.
737 */
738 sp->pp_last_recv = time_uptime;
739 }
740
741 static void
sppp_ifstart_sched(void * dummy)742 sppp_ifstart_sched(void *dummy)
743 {
744 struct sppp *sp = dummy;
745
746 sp->if_start(SP2IFP(sp));
747 }
748
749 /* if_start () wrapper function. We use it to schedule real if_start () for
750 * execution. We can't call it directly
751 */
752 static void
sppp_ifstart(struct ifnet * ifp)753 sppp_ifstart(struct ifnet *ifp)
754 {
755 struct sppp *sp = IFP2SP(ifp);
756
757 if (SPPP_LOCK_OWNED(sp)) {
758 if (callout_pending(&sp->ifstart_callout))
759 return;
760 callout_reset(&sp->ifstart_callout, 1, sppp_ifstart_sched,
761 (void *)sp);
762 } else {
763 sp->if_start(ifp);
764 }
765 }
766
767 /*
768 * Enqueue transmit packet.
769 */
770 static int
sppp_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * ro)771 sppp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
772 struct route *ro)
773 {
774 struct sppp *sp = IFP2SP(ifp);
775 struct ppp_header *h;
776 struct ifqueue *ifq = NULL;
777 int error, rv = 0;
778 #ifdef INET
779 int ipproto = PPP_IP;
780 #endif
781 int debug = ifp->if_flags & IFF_DEBUG;
782
783 SPPP_LOCK(sp);
784
785 if (!(ifp->if_flags & IFF_UP) ||
786 (!(ifp->if_flags & IFF_AUTO) &&
787 !(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
788 #ifdef INET6
789 drop:
790 #endif
791 m_freem (m);
792 SPPP_UNLOCK(sp);
793 return (ENETDOWN);
794 }
795
796 if ((ifp->if_flags & IFF_AUTO) &&
797 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
798 #ifdef INET6
799 /*
800 * XXX
801 *
802 * Hack to prevent the initialization-time generated
803 * IPv6 multicast packet to erroneously cause a
804 * dialout event in case IPv6 has been
805 * administratively disabled on that interface.
806 */
807 if (dst->sa_family == AF_INET6 &&
808 !(sp->confflags & CONF_ENABLE_IPV6))
809 goto drop;
810 #endif
811 /*
812 * Interface is not yet running, but auto-dial. Need
813 * to start LCP for it.
814 */
815 ifp->if_drv_flags |= IFF_DRV_RUNNING;
816 lcp.Open(sp);
817 }
818
819 #ifdef INET
820 if (dst->sa_family == AF_INET) {
821 /* XXX Check mbuf length here? */
822 struct ip *ip = mtod (m, struct ip*);
823 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
824
825 /*
826 * When using dynamic local IP address assignment by using
827 * 0.0.0.0 as a local address, the first TCP session will
828 * not connect because the local TCP checksum is computed
829 * using 0.0.0.0 which will later become our real IP address
830 * so the TCP checksum computed at the remote end will
831 * become invalid. So we
832 * - don't let packets with src ip addr 0 thru
833 * - we flag TCP packets with src ip 0 as an error
834 */
835
836 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
837 {
838 m_freem(m);
839 SPPP_UNLOCK(sp);
840 if(ip->ip_p == IPPROTO_TCP)
841 return(EADDRNOTAVAIL);
842 else
843 return(0);
844 }
845
846 /*
847 * Put low delay, telnet, rlogin and ftp control packets
848 * in front of the queue or let ALTQ take care.
849 */
850 if (ALTQ_IS_ENABLED(&ifp->if_snd))
851 ;
852 else if (_IF_QFULL(&sp->pp_fastq))
853 ;
854 else if (ip->ip_tos & IPTOS_LOWDELAY)
855 ifq = &sp->pp_fastq;
856 else if (m->m_len < sizeof *ip + sizeof *tcp)
857 ;
858 else if (ip->ip_p != IPPROTO_TCP)
859 ;
860 else if (INTERACTIVE (ntohs (tcp->th_sport)))
861 ifq = &sp->pp_fastq;
862 else if (INTERACTIVE (ntohs (tcp->th_dport)))
863 ifq = &sp->pp_fastq;
864
865 /*
866 * Do IP Header compression
867 */
868 if (sp->pp_mode != IFF_CISCO && sp->pp_mode != PP_FR &&
869 (sp->ipcp.flags & IPCP_VJ) && ip->ip_p == IPPROTO_TCP)
870 switch (sl_compress_tcp(m, ip, sp->pp_comp,
871 sp->ipcp.compress_cid)) {
872 case TYPE_COMPRESSED_TCP:
873 ipproto = PPP_VJ_COMP;
874 break;
875 case TYPE_UNCOMPRESSED_TCP:
876 ipproto = PPP_VJ_UCOMP;
877 break;
878 case TYPE_IP:
879 ipproto = PPP_IP;
880 break;
881 default:
882 m_freem(m);
883 SPPP_UNLOCK(sp);
884 return (EINVAL);
885 }
886 }
887 #endif
888
889 #ifdef INET6
890 if (dst->sa_family == AF_INET6) {
891 /* XXX do something tricky here? */
892 }
893 #endif
894
895 if (sp->pp_mode == PP_FR) {
896 /* Add frame relay header. */
897 m = sppp_fr_header (sp, m, dst->sa_family);
898 if (! m)
899 goto nobufs;
900 goto out;
901 }
902
903 /*
904 * Prepend general data packet PPP header. For now, IP only.
905 */
906 M_PREPEND (m, PPP_HEADER_LEN, M_NOWAIT);
907 if (! m) {
908 nobufs: if (debug)
909 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
910 SPP_ARGS(ifp));
911 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
912 SPPP_UNLOCK(sp);
913 return (ENOBUFS);
914 }
915 /*
916 * May want to check size of packet
917 * (albeit due to the implementation it's always enough)
918 */
919 h = mtod (m, struct ppp_header*);
920 if (sp->pp_mode == IFF_CISCO) {
921 h->address = CISCO_UNICAST; /* unicast address */
922 h->control = 0;
923 } else {
924 h->address = PPP_ALLSTATIONS; /* broadcast address */
925 h->control = PPP_UI; /* Unnumbered Info */
926 }
927
928 switch (dst->sa_family) {
929 #ifdef INET
930 case AF_INET: /* Internet Protocol */
931 if (sp->pp_mode == IFF_CISCO)
932 h->protocol = htons (ETHERTYPE_IP);
933 else {
934 /*
935 * Don't choke with an ENETDOWN early. It's
936 * possible that we just started dialing out,
937 * so don't drop the packet immediately. If
938 * we notice that we run out of buffer space
939 * below, we will however remember that we are
940 * not ready to carry IP packets, and return
941 * ENETDOWN, as opposed to ENOBUFS.
942 */
943 h->protocol = htons(ipproto);
944 if (sp->state[IDX_IPCP] != STATE_OPENED)
945 rv = ENETDOWN;
946 }
947 break;
948 #endif
949 #ifdef INET6
950 case AF_INET6: /* Internet Protocol */
951 if (sp->pp_mode == IFF_CISCO)
952 h->protocol = htons (ETHERTYPE_IPV6);
953 else {
954 /*
955 * Don't choke with an ENETDOWN early. It's
956 * possible that we just started dialing out,
957 * so don't drop the packet immediately. If
958 * we notice that we run out of buffer space
959 * below, we will however remember that we are
960 * not ready to carry IP packets, and return
961 * ENETDOWN, as opposed to ENOBUFS.
962 */
963 h->protocol = htons(PPP_IPV6);
964 if (sp->state[IDX_IPV6CP] != STATE_OPENED)
965 rv = ENETDOWN;
966 }
967 break;
968 #endif
969 default:
970 m_freem (m);
971 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
972 SPPP_UNLOCK(sp);
973 return (EAFNOSUPPORT);
974 }
975
976 /*
977 * Queue message on interface, and start output if interface
978 * not yet active.
979 */
980 out:
981 if (ifq != NULL)
982 error = !(IF_HANDOFF_ADJ(ifq, m, ifp, 3));
983 else
984 IFQ_HANDOFF_ADJ(ifp, m, 3, error);
985 if (error) {
986 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
987 SPPP_UNLOCK(sp);
988 return (rv? rv: ENOBUFS);
989 }
990 SPPP_UNLOCK(sp);
991 /*
992 * Unlike in sppp_input(), we can always bump the timestamp
993 * here since sppp_output() is only called on behalf of
994 * network-layer traffic; control-layer traffic is handled
995 * by sppp_cp_send().
996 */
997 sp->pp_last_sent = time_uptime;
998 return (0);
999 }
1000
1001 void
sppp_attach(struct ifnet * ifp)1002 sppp_attach(struct ifnet *ifp)
1003 {
1004 struct sppp *sp = IFP2SP(ifp);
1005
1006 /* Initialize mtx lock */
1007 mtx_init(&sp->mtx, "sppp", MTX_NETWORK_LOCK, MTX_DEF | MTX_RECURSE);
1008
1009 /* Initialize keepalive handler. */
1010 callout_init(&sp->keepalive_callout, 1);
1011 callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
1012 (void *)sp);
1013
1014 ifp->if_mtu = PP_MTU;
1015 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1016 ifp->if_output = sppp_output;
1017 #if 0
1018 sp->pp_flags = PP_KEEPALIVE;
1019 #endif
1020 ifp->if_snd.ifq_maxlen = 32;
1021 sp->pp_fastq.ifq_maxlen = 32;
1022 sp->pp_cpq.ifq_maxlen = 20;
1023 sp->pp_loopcnt = 0;
1024 sp->pp_alivecnt = 0;
1025 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1026 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1027 sp->pp_phase = PHASE_DEAD;
1028 sp->pp_up = sppp_pp_up;
1029 sp->pp_down = sppp_pp_down;
1030 if(!mtx_initialized(&sp->pp_cpq.ifq_mtx))
1031 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", NULL, MTX_DEF);
1032 if(!mtx_initialized(&sp->pp_fastq.ifq_mtx))
1033 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", NULL, MTX_DEF);
1034 sp->pp_last_recv = sp->pp_last_sent = time_uptime;
1035 sp->confflags = 0;
1036 #ifdef INET
1037 sp->confflags |= CONF_ENABLE_VJ;
1038 #endif
1039 #ifdef INET6
1040 sp->confflags |= CONF_ENABLE_IPV6;
1041 #endif
1042 callout_init(&sp->ifstart_callout, 1);
1043 sp->if_start = ifp->if_start;
1044 ifp->if_start = sppp_ifstart;
1045 sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1046 sl_compress_init(sp->pp_comp, -1);
1047 sppp_lcp_init(sp);
1048 sppp_ipcp_init(sp);
1049 sppp_ipv6cp_init(sp);
1050 sppp_pap_init(sp);
1051 sppp_chap_init(sp);
1052 }
1053
1054 void
sppp_detach(struct ifnet * ifp)1055 sppp_detach(struct ifnet *ifp)
1056 {
1057 struct sppp *sp = IFP2SP(ifp);
1058 int i;
1059
1060 KASSERT(mtx_initialized(&sp->mtx), ("sppp mutex is not initialized"));
1061
1062 /* Stop keepalive handler. */
1063 callout_drain(&sp->keepalive_callout);
1064
1065 for (i = 0; i < IDX_COUNT; i++) {
1066 callout_drain(&sp->ch[i]);
1067 }
1068 callout_drain(&sp->pap_my_to_ch);
1069
1070 mtx_destroy(&sp->pp_cpq.ifq_mtx);
1071 mtx_destroy(&sp->pp_fastq.ifq_mtx);
1072 mtx_destroy(&sp->mtx);
1073 }
1074
1075 /*
1076 * Flush the interface output queue.
1077 */
1078 static void
sppp_flush_unlocked(struct ifnet * ifp)1079 sppp_flush_unlocked(struct ifnet *ifp)
1080 {
1081 struct sppp *sp = IFP2SP(ifp);
1082
1083 sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1084 sppp_qflush (&sp->pp_fastq);
1085 sppp_qflush (&sp->pp_cpq);
1086 }
1087
1088 void
sppp_flush(struct ifnet * ifp)1089 sppp_flush(struct ifnet *ifp)
1090 {
1091 struct sppp *sp = IFP2SP(ifp);
1092
1093 SPPP_LOCK(sp);
1094 sppp_flush_unlocked (ifp);
1095 SPPP_UNLOCK(sp);
1096 }
1097
1098 /*
1099 * Check if the output queue is empty.
1100 */
1101 int
sppp_isempty(struct ifnet * ifp)1102 sppp_isempty(struct ifnet *ifp)
1103 {
1104 struct sppp *sp = IFP2SP(ifp);
1105 int empty;
1106
1107 SPPP_LOCK(sp);
1108 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1109 !SP2IFP(sp)->if_snd.ifq_head;
1110 SPPP_UNLOCK(sp);
1111 return (empty);
1112 }
1113
1114 /*
1115 * Get next packet to send.
1116 */
1117 struct mbuf *
sppp_dequeue(struct ifnet * ifp)1118 sppp_dequeue(struct ifnet *ifp)
1119 {
1120 struct sppp *sp = IFP2SP(ifp);
1121 struct mbuf *m;
1122
1123 SPPP_LOCK(sp);
1124 /*
1125 * Process only the control protocol queue until we have at
1126 * least one NCP open.
1127 *
1128 * Do always serve all three queues in Cisco mode.
1129 */
1130 IF_DEQUEUE(&sp->pp_cpq, m);
1131 if (m == NULL &&
1132 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1133 sp->pp_mode == PP_FR)) {
1134 IF_DEQUEUE(&sp->pp_fastq, m);
1135 if (m == NULL)
1136 IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1137 }
1138 SPPP_UNLOCK(sp);
1139 return m;
1140 }
1141
1142 /*
1143 * Pick the next packet, do not remove it from the queue.
1144 */
1145 struct mbuf *
sppp_pick(struct ifnet * ifp)1146 sppp_pick(struct ifnet *ifp)
1147 {
1148 struct sppp *sp = IFP2SP(ifp);
1149 struct mbuf *m;
1150
1151 SPPP_LOCK(sp);
1152
1153 m = sp->pp_cpq.ifq_head;
1154 if (m == NULL &&
1155 (sp->pp_phase == PHASE_NETWORK ||
1156 sp->pp_mode == IFF_CISCO ||
1157 sp->pp_mode == PP_FR))
1158 if ((m = sp->pp_fastq.ifq_head) == NULL)
1159 m = SP2IFP(sp)->if_snd.ifq_head;
1160 SPPP_UNLOCK(sp);
1161 return (m);
1162 }
1163
1164 /*
1165 * Process an ioctl request. Called on low priority level.
1166 */
1167 int
sppp_ioctl(struct ifnet * ifp,IOCTL_CMD_T cmd,void * data)1168 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1169 {
1170 struct ifreq *ifr = (struct ifreq*) data;
1171 struct sppp *sp = IFP2SP(ifp);
1172 int rv, going_up, going_down, newmode;
1173
1174 SPPP_LOCK(sp);
1175 rv = 0;
1176 switch (cmd) {
1177 case SIOCAIFADDR:
1178 break;
1179
1180 case SIOCSIFADDR:
1181 /* set the interface "up" when assigning an IP address */
1182 ifp->if_flags |= IFF_UP;
1183 /* FALLTHROUGH */
1184
1185 case SIOCSIFFLAGS:
1186 going_up = ifp->if_flags & IFF_UP &&
1187 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1188 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1189 ifp->if_drv_flags & IFF_DRV_RUNNING;
1190
1191 newmode = ifp->if_flags & IFF_PASSIVE;
1192 if (!newmode)
1193 newmode = ifp->if_flags & IFF_AUTO;
1194 if (!newmode)
1195 newmode = ifp->if_flags & IFF_CISCO;
1196 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1197 ifp->if_flags |= newmode;
1198
1199 if (!newmode)
1200 newmode = sp->pp_flags & PP_FR;
1201
1202 if (newmode != sp->pp_mode) {
1203 going_down = 1;
1204 if (!going_up)
1205 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1206 }
1207
1208 if (going_down) {
1209 if (sp->pp_mode != IFF_CISCO &&
1210 sp->pp_mode != PP_FR)
1211 lcp.Close(sp);
1212 else if (sp->pp_tlf)
1213 (sp->pp_tlf)(sp);
1214 sppp_flush_unlocked(ifp);
1215 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1216 sp->pp_mode = newmode;
1217 }
1218
1219 if (going_up) {
1220 if (sp->pp_mode != IFF_CISCO &&
1221 sp->pp_mode != PP_FR)
1222 lcp.Close(sp);
1223 sp->pp_mode = newmode;
1224 if (sp->pp_mode == 0) {
1225 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1226 lcp.Open(sp);
1227 }
1228 if ((sp->pp_mode == IFF_CISCO) ||
1229 (sp->pp_mode == PP_FR)) {
1230 if (sp->pp_tls)
1231 (sp->pp_tls)(sp);
1232 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1233 }
1234 }
1235
1236 break;
1237
1238 #ifdef SIOCSIFMTU
1239 #ifndef ifr_mtu
1240 #define ifr_mtu ifr_metric
1241 #endif
1242 case SIOCSIFMTU:
1243 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1244 return (EINVAL);
1245 ifp->if_mtu = ifr->ifr_mtu;
1246 break;
1247 #endif
1248 #ifdef SLIOCSETMTU
1249 case SLIOCSETMTU:
1250 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1251 return (EINVAL);
1252 ifp->if_mtu = *(short*)data;
1253 break;
1254 #endif
1255 #ifdef SIOCGIFMTU
1256 case SIOCGIFMTU:
1257 ifr->ifr_mtu = ifp->if_mtu;
1258 break;
1259 #endif
1260 #ifdef SLIOCGETMTU
1261 case SLIOCGETMTU:
1262 *(short*)data = ifp->if_mtu;
1263 break;
1264 #endif
1265 case SIOCADDMULTI:
1266 case SIOCDELMULTI:
1267 break;
1268
1269 case SIOCGIFGENERIC:
1270 case SIOCSIFGENERIC:
1271 rv = sppp_params(sp, cmd, data);
1272 break;
1273
1274 default:
1275 rv = ENOTTY;
1276 }
1277 SPPP_UNLOCK(sp);
1278 return rv;
1279 }
1280
1281 /*
1282 * Cisco framing implementation.
1283 */
1284
1285 /*
1286 * Handle incoming Cisco keepalive protocol packets.
1287 */
1288 static void
sppp_cisco_input(struct sppp * sp,struct mbuf * m)1289 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1290 {
1291 STDDCL;
1292 struct cisco_packet *h;
1293 u_long me, mymask;
1294
1295 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1296 if (debug)
1297 log(LOG_DEBUG,
1298 SPP_FMT "cisco invalid packet length: %d bytes\n",
1299 SPP_ARGS(ifp), m->m_pkthdr.len);
1300 return;
1301 }
1302 h = mtod (m, struct cisco_packet*);
1303 if (debug)
1304 log(LOG_DEBUG,
1305 SPP_FMT "cisco input: %d bytes "
1306 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1307 SPP_ARGS(ifp), m->m_pkthdr.len,
1308 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1309 (u_int)h->time0, (u_int)h->time1);
1310 switch (ntohl (h->type)) {
1311 default:
1312 if (debug)
1313 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1314 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1315 break;
1316 case CISCO_ADDR_REPLY:
1317 /* Reply on address request, ignore */
1318 break;
1319 case CISCO_KEEPALIVE_REQ:
1320 sp->pp_alivecnt = 0;
1321 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1322 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1323 /* Local and remote sequence numbers are equal.
1324 * Probably, the line is in loopback mode. */
1325 if (sp->pp_loopcnt >= MAXALIVECNT) {
1326 printf (SPP_FMT "loopback\n",
1327 SPP_ARGS(ifp));
1328 sp->pp_loopcnt = 0;
1329 if (ifp->if_flags & IFF_UP) {
1330 if_down (ifp);
1331 sppp_qflush (&sp->pp_cpq);
1332 }
1333 }
1334 ++sp->pp_loopcnt;
1335
1336 /* Generate new local sequence number */
1337 sp->pp_seq[IDX_LCP] = random();
1338 break;
1339 }
1340 sp->pp_loopcnt = 0;
1341 if (! (ifp->if_flags & IFF_UP) &&
1342 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1343 if_up(ifp);
1344 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1345 }
1346 break;
1347 case CISCO_ADDR_REQ:
1348 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1349 if (me != 0L)
1350 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1351 break;
1352 }
1353 }
1354
1355 /*
1356 * Send Cisco keepalive packet.
1357 */
1358 static void
sppp_cisco_send(struct sppp * sp,int type,long par1,long par2)1359 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1360 {
1361 STDDCL;
1362 struct ppp_header *h;
1363 struct cisco_packet *ch;
1364 struct mbuf *m;
1365 struct timeval tv;
1366
1367 getmicrouptime(&tv);
1368
1369 MGETHDR (m, M_NOWAIT, MT_DATA);
1370 if (! m)
1371 return;
1372 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1373 m->m_pkthdr.rcvif = 0;
1374
1375 h = mtod (m, struct ppp_header*);
1376 h->address = CISCO_MULTICAST;
1377 h->control = 0;
1378 h->protocol = htons (CISCO_KEEPALIVE);
1379
1380 ch = (struct cisco_packet*) (h + 1);
1381 ch->type = htonl (type);
1382 ch->par1 = htonl (par1);
1383 ch->par2 = htonl (par2);
1384 ch->rel = -1;
1385
1386 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1387 ch->time1 = htons ((u_short) tv.tv_sec);
1388
1389 if (debug)
1390 log(LOG_DEBUG,
1391 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1392 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1393 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1394
1395 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1396 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1397 }
1398
1399 /*
1400 * PPP protocol implementation.
1401 */
1402
1403 /*
1404 * Send PPP control protocol packet.
1405 */
1406 static void
sppp_cp_send(struct sppp * sp,u_short proto,u_char type,u_char ident,u_short len,void * data)1407 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1408 u_char ident, u_short len, void *data)
1409 {
1410 STDDCL;
1411 struct ppp_header *h;
1412 struct lcp_header *lh;
1413 struct mbuf *m;
1414
1415 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1416 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1417 MGETHDR (m, M_NOWAIT, MT_DATA);
1418 if (! m)
1419 return;
1420 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1421 m->m_pkthdr.rcvif = 0;
1422
1423 h = mtod (m, struct ppp_header*);
1424 h->address = PPP_ALLSTATIONS; /* broadcast address */
1425 h->control = PPP_UI; /* Unnumbered Info */
1426 h->protocol = htons (proto); /* Link Control Protocol */
1427
1428 lh = (struct lcp_header*) (h + 1);
1429 lh->type = type;
1430 lh->ident = ident;
1431 lh->len = htons (LCP_HEADER_LEN + len);
1432 if (len)
1433 bcopy (data, lh+1, len);
1434
1435 if (debug) {
1436 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1437 SPP_ARGS(ifp),
1438 sppp_proto_name(proto),
1439 sppp_cp_type_name (lh->type), lh->ident,
1440 ntohs (lh->len));
1441 sppp_print_bytes ((u_char*) (lh+1), len);
1442 log(-1, ">\n");
1443 }
1444 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1445 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1446 }
1447
1448 /*
1449 * Handle incoming PPP control protocol packets.
1450 */
1451 static void
sppp_cp_input(const struct cp * cp,struct sppp * sp,struct mbuf * m)1452 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1453 {
1454 STDDCL;
1455 struct lcp_header *h;
1456 int len = m->m_pkthdr.len;
1457 int rv;
1458 u_char *p;
1459
1460 if (len < 4) {
1461 if (debug)
1462 log(LOG_DEBUG,
1463 SPP_FMT "%s invalid packet length: %d bytes\n",
1464 SPP_ARGS(ifp), cp->name, len);
1465 return;
1466 }
1467 h = mtod (m, struct lcp_header*);
1468 if (debug) {
1469 log(LOG_DEBUG,
1470 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1471 SPP_ARGS(ifp), cp->name,
1472 sppp_state_name(sp->state[cp->protoidx]),
1473 sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1474 sppp_print_bytes ((u_char*) (h+1), len-4);
1475 log(-1, ">\n");
1476 }
1477 if (len > ntohs (h->len))
1478 len = ntohs (h->len);
1479 p = (u_char *)(h + 1);
1480 switch (h->type) {
1481 case CONF_REQ:
1482 if (len < 4) {
1483 if (debug)
1484 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1485 SPP_ARGS(ifp), cp->name,
1486 len);
1487 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1488 break;
1489 }
1490 /* handle states where RCR doesn't get a SCA/SCN */
1491 switch (sp->state[cp->protoidx]) {
1492 case STATE_CLOSING:
1493 case STATE_STOPPING:
1494 return;
1495 case STATE_CLOSED:
1496 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1497 0, 0);
1498 return;
1499 }
1500 rv = (cp->RCR)(sp, h, len);
1501 switch (sp->state[cp->protoidx]) {
1502 case STATE_OPENED:
1503 (cp->tld)(sp);
1504 (cp->scr)(sp);
1505 /* FALLTHROUGH */
1506 case STATE_ACK_SENT:
1507 case STATE_REQ_SENT:
1508 /*
1509 * sppp_cp_change_state() have the side effect of
1510 * restarting the timeouts. We want to avoid that
1511 * if the state don't change, otherwise we won't
1512 * ever timeout and resend a configuration request
1513 * that got lost.
1514 */
1515 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1516 STATE_REQ_SENT))
1517 break;
1518 sppp_cp_change_state(cp, sp, rv?
1519 STATE_ACK_SENT: STATE_REQ_SENT);
1520 break;
1521 case STATE_STOPPED:
1522 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1523 (cp->scr)(sp);
1524 sppp_cp_change_state(cp, sp, rv?
1525 STATE_ACK_SENT: STATE_REQ_SENT);
1526 break;
1527 case STATE_ACK_RCVD:
1528 if (rv) {
1529 sppp_cp_change_state(cp, sp, STATE_OPENED);
1530 if (debug)
1531 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1532 SPP_ARGS(ifp),
1533 cp->name);
1534 (cp->tlu)(sp);
1535 } else
1536 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1537 break;
1538 default:
1539 printf(SPP_FMT "%s illegal %s in state %s\n",
1540 SPP_ARGS(ifp), cp->name,
1541 sppp_cp_type_name(h->type),
1542 sppp_state_name(sp->state[cp->protoidx]));
1543 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1544 }
1545 break;
1546 case CONF_ACK:
1547 if (h->ident != sp->confid[cp->protoidx]) {
1548 if (debug)
1549 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1550 SPP_ARGS(ifp), cp->name,
1551 h->ident, sp->confid[cp->protoidx]);
1552 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1553 break;
1554 }
1555 switch (sp->state[cp->protoidx]) {
1556 case STATE_CLOSED:
1557 case STATE_STOPPED:
1558 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1559 break;
1560 case STATE_CLOSING:
1561 case STATE_STOPPING:
1562 break;
1563 case STATE_REQ_SENT:
1564 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1565 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1566 break;
1567 case STATE_OPENED:
1568 (cp->tld)(sp);
1569 /* FALLTHROUGH */
1570 case STATE_ACK_RCVD:
1571 (cp->scr)(sp);
1572 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1573 break;
1574 case STATE_ACK_SENT:
1575 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1576 sppp_cp_change_state(cp, sp, STATE_OPENED);
1577 if (debug)
1578 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1579 SPP_ARGS(ifp), cp->name);
1580 (cp->tlu)(sp);
1581 break;
1582 default:
1583 printf(SPP_FMT "%s illegal %s in state %s\n",
1584 SPP_ARGS(ifp), cp->name,
1585 sppp_cp_type_name(h->type),
1586 sppp_state_name(sp->state[cp->protoidx]));
1587 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1588 }
1589 break;
1590 case CONF_NAK:
1591 case CONF_REJ:
1592 if (h->ident != sp->confid[cp->protoidx]) {
1593 if (debug)
1594 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1595 SPP_ARGS(ifp), cp->name,
1596 h->ident, sp->confid[cp->protoidx]);
1597 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1598 break;
1599 }
1600 if (h->type == CONF_NAK)
1601 (cp->RCN_nak)(sp, h, len);
1602 else /* CONF_REJ */
1603 (cp->RCN_rej)(sp, h, len);
1604
1605 switch (sp->state[cp->protoidx]) {
1606 case STATE_CLOSED:
1607 case STATE_STOPPED:
1608 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1609 break;
1610 case STATE_REQ_SENT:
1611 case STATE_ACK_SENT:
1612 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1613 /*
1614 * Slow things down a bit if we think we might be
1615 * in loopback. Depend on the timeout to send the
1616 * next configuration request.
1617 */
1618 if (sp->pp_loopcnt)
1619 break;
1620 (cp->scr)(sp);
1621 break;
1622 case STATE_OPENED:
1623 (cp->tld)(sp);
1624 /* FALLTHROUGH */
1625 case STATE_ACK_RCVD:
1626 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1627 (cp->scr)(sp);
1628 break;
1629 case STATE_CLOSING:
1630 case STATE_STOPPING:
1631 break;
1632 default:
1633 printf(SPP_FMT "%s illegal %s in state %s\n",
1634 SPP_ARGS(ifp), cp->name,
1635 sppp_cp_type_name(h->type),
1636 sppp_state_name(sp->state[cp->protoidx]));
1637 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1638 }
1639 break;
1640
1641 case TERM_REQ:
1642 switch (sp->state[cp->protoidx]) {
1643 case STATE_ACK_RCVD:
1644 case STATE_ACK_SENT:
1645 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1646 /* FALLTHROUGH */
1647 case STATE_CLOSED:
1648 case STATE_STOPPED:
1649 case STATE_CLOSING:
1650 case STATE_STOPPING:
1651 case STATE_REQ_SENT:
1652 sta:
1653 /* Send Terminate-Ack packet. */
1654 if (debug)
1655 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1656 SPP_ARGS(ifp), cp->name);
1657 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1658 break;
1659 case STATE_OPENED:
1660 (cp->tld)(sp);
1661 sp->rst_counter[cp->protoidx] = 0;
1662 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1663 goto sta;
1664 break;
1665 default:
1666 printf(SPP_FMT "%s illegal %s in state %s\n",
1667 SPP_ARGS(ifp), cp->name,
1668 sppp_cp_type_name(h->type),
1669 sppp_state_name(sp->state[cp->protoidx]));
1670 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1671 }
1672 break;
1673 case TERM_ACK:
1674 switch (sp->state[cp->protoidx]) {
1675 case STATE_CLOSED:
1676 case STATE_STOPPED:
1677 case STATE_REQ_SENT:
1678 case STATE_ACK_SENT:
1679 break;
1680 case STATE_CLOSING:
1681 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1682 (cp->tlf)(sp);
1683 break;
1684 case STATE_STOPPING:
1685 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1686 (cp->tlf)(sp);
1687 break;
1688 case STATE_ACK_RCVD:
1689 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1690 break;
1691 case STATE_OPENED:
1692 (cp->tld)(sp);
1693 (cp->scr)(sp);
1694 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1695 break;
1696 default:
1697 printf(SPP_FMT "%s illegal %s in state %s\n",
1698 SPP_ARGS(ifp), cp->name,
1699 sppp_cp_type_name(h->type),
1700 sppp_state_name(sp->state[cp->protoidx]));
1701 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1702 }
1703 break;
1704 case CODE_REJ:
1705 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1706 log(LOG_INFO,
1707 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1708 "danger will robinson\n",
1709 SPP_ARGS(ifp), cp->name,
1710 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1711 switch (sp->state[cp->protoidx]) {
1712 case STATE_CLOSED:
1713 case STATE_STOPPED:
1714 case STATE_REQ_SENT:
1715 case STATE_ACK_SENT:
1716 case STATE_CLOSING:
1717 case STATE_STOPPING:
1718 case STATE_OPENED:
1719 break;
1720 case STATE_ACK_RCVD:
1721 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1722 break;
1723 default:
1724 printf(SPP_FMT "%s illegal %s in state %s\n",
1725 SPP_ARGS(ifp), cp->name,
1726 sppp_cp_type_name(h->type),
1727 sppp_state_name(sp->state[cp->protoidx]));
1728 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1729 }
1730 break;
1731 case PROTO_REJ:
1732 {
1733 int catastrophic;
1734 const struct cp *upper;
1735 int i;
1736 u_int16_t proto;
1737
1738 catastrophic = 0;
1739 upper = NULL;
1740 proto = ntohs(*((u_int16_t *)p));
1741 for (i = 0; i < IDX_COUNT; i++) {
1742 if (cps[i]->proto == proto) {
1743 upper = cps[i];
1744 break;
1745 }
1746 }
1747 if (upper == NULL)
1748 catastrophic++;
1749
1750 if (catastrophic || debug)
1751 log(catastrophic? LOG_INFO: LOG_DEBUG,
1752 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1753 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1754 sppp_cp_type_name(h->type), proto,
1755 upper ? upper->name : "unknown",
1756 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1757
1758 /*
1759 * if we got RXJ+ against conf-req, the peer does not implement
1760 * this particular protocol type. terminate the protocol.
1761 */
1762 if (upper && !catastrophic) {
1763 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1764 upper->Close(sp);
1765 break;
1766 }
1767 }
1768
1769 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1770 switch (sp->state[cp->protoidx]) {
1771 case STATE_CLOSED:
1772 case STATE_STOPPED:
1773 case STATE_REQ_SENT:
1774 case STATE_ACK_SENT:
1775 case STATE_CLOSING:
1776 case STATE_STOPPING:
1777 case STATE_OPENED:
1778 break;
1779 case STATE_ACK_RCVD:
1780 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1781 break;
1782 default:
1783 printf(SPP_FMT "%s illegal %s in state %s\n",
1784 SPP_ARGS(ifp), cp->name,
1785 sppp_cp_type_name(h->type),
1786 sppp_state_name(sp->state[cp->protoidx]));
1787 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1788 }
1789 break;
1790 }
1791 case DISC_REQ:
1792 if (cp->proto != PPP_LCP)
1793 goto illegal;
1794 /* Discard the packet. */
1795 break;
1796 case ECHO_REQ:
1797 if (cp->proto != PPP_LCP)
1798 goto illegal;
1799 if (sp->state[cp->protoidx] != STATE_OPENED) {
1800 if (debug)
1801 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1802 SPP_ARGS(ifp));
1803 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1804 break;
1805 }
1806 if (len < 8) {
1807 if (debug)
1808 log(-1, SPP_FMT "invalid lcp echo request "
1809 "packet length: %d bytes\n",
1810 SPP_ARGS(ifp), len);
1811 break;
1812 }
1813 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1814 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1815 /* Line loopback mode detected. */
1816 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1817 sp->pp_loopcnt = MAXALIVECNT * 5;
1818 if_down (ifp);
1819 sppp_qflush (&sp->pp_cpq);
1820
1821 /* Shut down the PPP link. */
1822 /* XXX */
1823 lcp.Down(sp);
1824 lcp.Up(sp);
1825 break;
1826 }
1827 *(long*)(h+1) = htonl (sp->lcp.magic);
1828 if (debug)
1829 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1830 SPP_ARGS(ifp));
1831 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1832 break;
1833 case ECHO_REPLY:
1834 if (cp->proto != PPP_LCP)
1835 goto illegal;
1836 if (h->ident != sp->lcp.echoid) {
1837 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1838 break;
1839 }
1840 if (len < 8) {
1841 if (debug)
1842 log(-1, SPP_FMT "lcp invalid echo reply "
1843 "packet length: %d bytes\n",
1844 SPP_ARGS(ifp), len);
1845 break;
1846 }
1847 if (debug)
1848 log(-1, SPP_FMT "lcp got echo rep\n",
1849 SPP_ARGS(ifp));
1850 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1851 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1852 sp->pp_alivecnt = 0;
1853 break;
1854 default:
1855 /* Unknown packet type -- send Code-Reject packet. */
1856 illegal:
1857 if (debug)
1858 log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1859 SPP_ARGS(ifp), cp->name, h->type);
1860 sppp_cp_send(sp, cp->proto, CODE_REJ,
1861 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1862 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1863 }
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
1934 static void
sppp_open_event(const struct cp * cp,struct sppp * sp)1935 sppp_open_event(const struct cp *cp, struct sppp *sp)
1936 {
1937 STDDCL;
1938
1939 if (debug)
1940 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1941 SPP_ARGS(ifp), cp->name,
1942 sppp_state_name(sp->state[cp->protoidx]));
1943
1944 switch (sp->state[cp->protoidx]) {
1945 case STATE_INITIAL:
1946 sppp_cp_change_state(cp, sp, STATE_STARTING);
1947 (cp->tls)(sp);
1948 break;
1949 case STATE_STARTING:
1950 break;
1951 case STATE_CLOSED:
1952 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1953 (cp->scr)(sp);
1954 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1955 break;
1956 case STATE_STOPPED:
1957 /*
1958 * Try escaping stopped state. This seems to bite
1959 * people occasionally, in particular for IPCP,
1960 * presumably following previous IPCP negotiation
1961 * aborts. Somehow, we must have missed a Down event
1962 * which would have caused a transition into starting
1963 * state, so as a bandaid we force the Down event now.
1964 * This effectively implements (something like the)
1965 * `restart' option mentioned in the state transition
1966 * table of RFC 1661.
1967 */
1968 sppp_cp_change_state(cp, sp, STATE_STARTING);
1969 (cp->tls)(sp);
1970 break;
1971 case STATE_STOPPING:
1972 case STATE_REQ_SENT:
1973 case STATE_ACK_RCVD:
1974 case STATE_ACK_SENT:
1975 case STATE_OPENED:
1976 break;
1977 case STATE_CLOSING:
1978 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1979 break;
1980 }
1981 }
1982
1983
1984 static void
sppp_close_event(const struct cp * cp,struct sppp * sp)1985 sppp_close_event(const struct cp *cp, struct sppp *sp)
1986 {
1987 STDDCL;
1988
1989 if (debug)
1990 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1991 SPP_ARGS(ifp), cp->name,
1992 sppp_state_name(sp->state[cp->protoidx]));
1993
1994 switch (sp->state[cp->protoidx]) {
1995 case STATE_INITIAL:
1996 case STATE_CLOSED:
1997 case STATE_CLOSING:
1998 break;
1999 case STATE_STARTING:
2000 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2001 (cp->tlf)(sp);
2002 break;
2003 case STATE_STOPPED:
2004 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2005 break;
2006 case STATE_STOPPING:
2007 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2008 break;
2009 case STATE_OPENED:
2010 (cp->tld)(sp);
2011 /* FALLTHROUGH */
2012 case STATE_REQ_SENT:
2013 case STATE_ACK_RCVD:
2014 case STATE_ACK_SENT:
2015 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2016 sppp_cp_send(sp, cp->proto, TERM_REQ,
2017 ++sp->pp_seq[cp->protoidx], 0, 0);
2018 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2019 break;
2020 }
2021 }
2022
2023 static void
sppp_to_event(const struct cp * cp,struct sppp * sp)2024 sppp_to_event(const struct cp *cp, struct sppp *sp)
2025 {
2026 STDDCL;
2027
2028 SPPP_LOCK(sp);
2029 if (debug)
2030 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2031 SPP_ARGS(ifp), cp->name,
2032 sppp_state_name(sp->state[cp->protoidx]),
2033 sp->rst_counter[cp->protoidx]);
2034
2035 if (--sp->rst_counter[cp->protoidx] < 0)
2036 /* TO- event */
2037 switch (sp->state[cp->protoidx]) {
2038 case STATE_CLOSING:
2039 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2040 (cp->tlf)(sp);
2041 break;
2042 case STATE_STOPPING:
2043 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2044 (cp->tlf)(sp);
2045 break;
2046 case STATE_REQ_SENT:
2047 case STATE_ACK_RCVD:
2048 case STATE_ACK_SENT:
2049 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2050 (cp->tlf)(sp);
2051 break;
2052 }
2053 else
2054 /* TO+ event */
2055 switch (sp->state[cp->protoidx]) {
2056 case STATE_CLOSING:
2057 case STATE_STOPPING:
2058 sppp_cp_send(sp, cp->proto, TERM_REQ,
2059 ++sp->pp_seq[cp->protoidx], 0, 0);
2060 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2061 cp->TO, (void *)sp);
2062 break;
2063 case STATE_REQ_SENT:
2064 case STATE_ACK_RCVD:
2065 (cp->scr)(sp);
2066 /* sppp_cp_change_state() will restart the timer */
2067 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2068 break;
2069 case STATE_ACK_SENT:
2070 (cp->scr)(sp);
2071 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2072 cp->TO, (void *)sp);
2073 break;
2074 }
2075
2076 SPPP_UNLOCK(sp);
2077 }
2078
2079 /*
2080 * Change the state of a control protocol in the state automaton.
2081 * Takes care of starting/stopping the restart timer.
2082 */
2083 static void
sppp_cp_change_state(const struct cp * cp,struct sppp * sp,int newstate)2084 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2085 {
2086 sp->state[cp->protoidx] = newstate;
2087
2088 callout_stop (&sp->ch[cp->protoidx]);
2089
2090 switch (newstate) {
2091 case STATE_INITIAL:
2092 case STATE_STARTING:
2093 case STATE_CLOSED:
2094 case STATE_STOPPED:
2095 case STATE_OPENED:
2096 break;
2097 case STATE_CLOSING:
2098 case STATE_STOPPING:
2099 case STATE_REQ_SENT:
2100 case STATE_ACK_RCVD:
2101 case STATE_ACK_SENT:
2102 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2103 cp->TO, (void *)sp);
2104 break;
2105 }
2106 }
2107
2108 /*
2109 *--------------------------------------------------------------------------*
2110 * *
2111 * The LCP implementation. *
2112 * *
2113 *--------------------------------------------------------------------------*
2114 */
2115 static void
sppp_pp_up(struct sppp * sp)2116 sppp_pp_up(struct sppp *sp)
2117 {
2118 SPPP_LOCK(sp);
2119 lcp.Up(sp);
2120 SPPP_UNLOCK(sp);
2121 }
2122
2123 static void
sppp_pp_down(struct sppp * sp)2124 sppp_pp_down(struct sppp *sp)
2125 {
2126 SPPP_LOCK(sp);
2127 lcp.Down(sp);
2128 SPPP_UNLOCK(sp);
2129 }
2130
2131 static void
sppp_lcp_init(struct sppp * sp)2132 sppp_lcp_init(struct sppp *sp)
2133 {
2134 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2135 sp->lcp.magic = 0;
2136 sp->state[IDX_LCP] = STATE_INITIAL;
2137 sp->fail_counter[IDX_LCP] = 0;
2138 sp->pp_seq[IDX_LCP] = 0;
2139 sp->pp_rseq[IDX_LCP] = 0;
2140 sp->lcp.protos = 0;
2141 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2142
2143 /* Note that these values are relevant for all control protocols */
2144 sp->lcp.timeout = 3 * hz;
2145 sp->lcp.max_terminate = 2;
2146 sp->lcp.max_configure = 10;
2147 sp->lcp.max_failure = 10;
2148 callout_init(&sp->ch[IDX_LCP], 1);
2149 }
2150
2151 static void
sppp_lcp_up(struct sppp * sp)2152 sppp_lcp_up(struct sppp *sp)
2153 {
2154 STDDCL;
2155
2156 sp->pp_alivecnt = 0;
2157 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2158 sp->lcp.magic = 0;
2159 sp->lcp.protos = 0;
2160 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2161 /*
2162 * If we are authenticator, negotiate LCP_AUTH
2163 */
2164 if (sp->hisauth.proto != 0)
2165 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2166 else
2167 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2168 sp->pp_flags &= ~PP_NEEDAUTH;
2169 /*
2170 * If this interface is passive or dial-on-demand, and we are
2171 * still in Initial state, it means we've got an incoming
2172 * call. Activate the interface.
2173 */
2174 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2175 if (debug)
2176 log(LOG_DEBUG,
2177 SPP_FMT "Up event", SPP_ARGS(ifp));
2178 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2179 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2180 if (debug)
2181 log(-1, "(incoming call)\n");
2182 sp->pp_flags |= PP_CALLIN;
2183 lcp.Open(sp);
2184 } else if (debug)
2185 log(-1, "\n");
2186 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2187 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2188 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2189 lcp.Open(sp);
2190 }
2191
2192 sppp_up_event(&lcp, sp);
2193 }
2194
2195 static void
sppp_lcp_down(struct sppp * sp)2196 sppp_lcp_down(struct sppp *sp)
2197 {
2198 STDDCL;
2199
2200 sppp_down_event(&lcp, sp);
2201
2202 /*
2203 * If this is neither a dial-on-demand nor a passive
2204 * interface, simulate an ``ifconfig down'' action, so the
2205 * administrator can force a redial by another ``ifconfig
2206 * up''. XXX For leased line operation, should we immediately
2207 * try to reopen the connection here?
2208 */
2209 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2210 log(LOG_INFO,
2211 SPP_FMT "Down event, taking interface down.\n",
2212 SPP_ARGS(ifp));
2213 if_down(ifp);
2214 } else {
2215 if (debug)
2216 log(LOG_DEBUG,
2217 SPP_FMT "Down event (carrier loss)\n",
2218 SPP_ARGS(ifp));
2219 sp->pp_flags &= ~PP_CALLIN;
2220 if (sp->state[IDX_LCP] != STATE_INITIAL)
2221 lcp.Close(sp);
2222 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2223 }
2224 }
2225
2226 static void
sppp_lcp_open(struct sppp * sp)2227 sppp_lcp_open(struct sppp *sp)
2228 {
2229 sppp_open_event(&lcp, sp);
2230 }
2231
2232 static void
sppp_lcp_close(struct sppp * sp)2233 sppp_lcp_close(struct sppp *sp)
2234 {
2235 sppp_close_event(&lcp, sp);
2236 }
2237
2238 static void
sppp_lcp_TO(void * cookie)2239 sppp_lcp_TO(void *cookie)
2240 {
2241 sppp_to_event(&lcp, (struct sppp *)cookie);
2242 }
2243
2244 /*
2245 * Analyze a configure request. Return true if it was agreeable, and
2246 * caused action sca, false if it has been rejected or nak'ed, and
2247 * caused action scn. (The return value is used to make the state
2248 * transition decision in the state automaton.)
2249 */
2250 static int
sppp_lcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2251 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2252 {
2253 STDDCL;
2254 u_char *buf, *r, *p;
2255 int origlen, rlen;
2256 u_long nmagic;
2257 u_short authproto;
2258
2259 len -= 4;
2260 origlen = len;
2261 buf = r = malloc (len, M_TEMP, M_NOWAIT);
2262 if (! buf)
2263 return (0);
2264
2265 if (debug)
2266 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2267 SPP_ARGS(ifp));
2268
2269 /* pass 1: check for things that need to be rejected */
2270 p = (void*) (h+1);
2271 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2272 len-=p[1], p+=p[1]) {
2273 if (debug)
2274 log(-1, " %s ", sppp_lcp_opt_name(*p));
2275 switch (*p) {
2276 case LCP_OPT_MAGIC:
2277 /* Magic number. */
2278 if (len >= 6 && p[1] == 6)
2279 continue;
2280 if (debug)
2281 log(-1, "[invalid] ");
2282 break;
2283 case LCP_OPT_ASYNC_MAP:
2284 /* Async control character map. */
2285 if (len >= 6 && p[1] == 6)
2286 continue;
2287 if (debug)
2288 log(-1, "[invalid] ");
2289 break;
2290 case LCP_OPT_MRU:
2291 /* Maximum receive unit. */
2292 if (len >= 4 && p[1] == 4)
2293 continue;
2294 if (debug)
2295 log(-1, "[invalid] ");
2296 break;
2297 case LCP_OPT_AUTH_PROTO:
2298 if (len < 4) {
2299 if (debug)
2300 log(-1, "[invalid] ");
2301 break;
2302 }
2303 authproto = (p[2] << 8) + p[3];
2304 if (authproto == PPP_CHAP && p[1] != 5) {
2305 if (debug)
2306 log(-1, "[invalid chap len] ");
2307 break;
2308 }
2309 if (sp->myauth.proto == 0) {
2310 /* we are not configured to do auth */
2311 if (debug)
2312 log(-1, "[not configured] ");
2313 break;
2314 }
2315 /*
2316 * Remote want us to authenticate, remember this,
2317 * so we stay in PHASE_AUTHENTICATE after LCP got
2318 * up.
2319 */
2320 sp->pp_flags |= PP_NEEDAUTH;
2321 continue;
2322 default:
2323 /* Others not supported. */
2324 if (debug)
2325 log(-1, "[rej] ");
2326 break;
2327 }
2328 /* Add the option to rejected list. */
2329 bcopy (p, r, p[1]);
2330 r += p[1];
2331 rlen += p[1];
2332 }
2333 if (rlen) {
2334 if (debug)
2335 log(-1, " send conf-rej\n");
2336 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2337 return 0;
2338 } else if (debug)
2339 log(-1, "\n");
2340
2341 /*
2342 * pass 2: check for option values that are unacceptable and
2343 * thus require to be nak'ed.
2344 */
2345 if (debug)
2346 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2347 SPP_ARGS(ifp));
2348
2349 p = (void*) (h+1);
2350 len = origlen;
2351 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2352 len-=p[1], p+=p[1]) {
2353 if (debug)
2354 log(-1, " %s ", sppp_lcp_opt_name(*p));
2355 switch (*p) {
2356 case LCP_OPT_MAGIC:
2357 /* Magic number -- extract. */
2358 nmagic = (u_long)p[2] << 24 |
2359 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2360 if (nmagic != sp->lcp.magic) {
2361 sp->pp_loopcnt = 0;
2362 if (debug)
2363 log(-1, "0x%lx ", nmagic);
2364 continue;
2365 }
2366 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2367 log(-1, "[glitch] ");
2368 ++sp->pp_loopcnt;
2369 /*
2370 * We negate our magic here, and NAK it. If
2371 * we see it later in an NAK packet, we
2372 * suggest a new one.
2373 */
2374 nmagic = ~sp->lcp.magic;
2375 /* Gonna NAK it. */
2376 p[2] = nmagic >> 24;
2377 p[3] = nmagic >> 16;
2378 p[4] = nmagic >> 8;
2379 p[5] = nmagic;
2380 break;
2381
2382 case LCP_OPT_ASYNC_MAP:
2383 /*
2384 * Async control character map -- just ignore it.
2385 *
2386 * Quote from RFC 1662, chapter 6:
2387 * To enable this functionality, synchronous PPP
2388 * implementations MUST always respond to the
2389 * Async-Control-Character-Map Configuration
2390 * Option with the LCP Configure-Ack. However,
2391 * acceptance of the Configuration Option does
2392 * not imply that the synchronous implementation
2393 * will do any ACCM mapping. Instead, all such
2394 * octet mapping will be performed by the
2395 * asynchronous-to-synchronous converter.
2396 */
2397 continue;
2398
2399 case LCP_OPT_MRU:
2400 /*
2401 * Maximum receive unit. Always agreeable,
2402 * but ignored by now.
2403 */
2404 sp->lcp.their_mru = p[2] * 256 + p[3];
2405 if (debug)
2406 log(-1, "%lu ", sp->lcp.their_mru);
2407 continue;
2408
2409 case LCP_OPT_AUTH_PROTO:
2410 authproto = (p[2] << 8) + p[3];
2411 if (sp->myauth.proto != authproto) {
2412 /* not agreed, nak */
2413 if (debug)
2414 log(-1, "[mine %s != his %s] ",
2415 sppp_proto_name(sp->hisauth.proto),
2416 sppp_proto_name(authproto));
2417 p[2] = sp->myauth.proto >> 8;
2418 p[3] = sp->myauth.proto;
2419 break;
2420 }
2421 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2422 if (debug)
2423 log(-1, "[chap not MD5] ");
2424 p[4] = CHAP_MD5;
2425 break;
2426 }
2427 continue;
2428 }
2429 /* Add the option to nak'ed list. */
2430 bcopy (p, r, p[1]);
2431 r += p[1];
2432 rlen += p[1];
2433 }
2434 if (rlen) {
2435 /*
2436 * Local and remote magics equal -- loopback?
2437 */
2438 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2439 if (sp->pp_loopcnt == MAXALIVECNT*5)
2440 printf (SPP_FMT "loopback\n",
2441 SPP_ARGS(ifp));
2442 if (ifp->if_flags & IFF_UP) {
2443 if_down(ifp);
2444 sppp_qflush(&sp->pp_cpq);
2445 /* XXX ? */
2446 lcp.Down(sp);
2447 lcp.Up(sp);
2448 }
2449 } else if (!sp->pp_loopcnt &&
2450 ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2451 if (debug)
2452 log(-1, " max_failure (%d) exceeded, "
2453 "send conf-rej\n",
2454 sp->lcp.max_failure);
2455 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2456 } else {
2457 if (debug)
2458 log(-1, " send conf-nak\n");
2459 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2460 }
2461 } else {
2462 if (debug)
2463 log(-1, " send conf-ack\n");
2464 sp->fail_counter[IDX_LCP] = 0;
2465 sp->pp_loopcnt = 0;
2466 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2467 h->ident, origlen, h+1);
2468 }
2469
2470 free (buf, M_TEMP);
2471 return (rlen == 0);
2472 }
2473
2474 /*
2475 * Analyze the LCP Configure-Reject option list, and adjust our
2476 * negotiation.
2477 */
2478 static void
sppp_lcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)2479 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2480 {
2481 STDDCL;
2482 u_char *buf, *p;
2483
2484 len -= 4;
2485 buf = malloc (len, M_TEMP, M_NOWAIT);
2486 if (!buf)
2487 return;
2488
2489 if (debug)
2490 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2491 SPP_ARGS(ifp));
2492
2493 p = (void*) (h+1);
2494 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2495 len -= p[1], p += p[1]) {
2496 if (debug)
2497 log(-1, " %s ", sppp_lcp_opt_name(*p));
2498 switch (*p) {
2499 case LCP_OPT_MAGIC:
2500 /* Magic number -- can't use it, use 0 */
2501 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2502 sp->lcp.magic = 0;
2503 break;
2504 case LCP_OPT_MRU:
2505 /*
2506 * Should not be rejected anyway, since we only
2507 * negotiate a MRU if explicitly requested by
2508 * peer.
2509 */
2510 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2511 break;
2512 case LCP_OPT_AUTH_PROTO:
2513 /*
2514 * Peer doesn't want to authenticate himself,
2515 * deny unless this is a dialout call, and
2516 * AUTHFLAG_NOCALLOUT is set.
2517 */
2518 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2519 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2520 if (debug)
2521 log(-1, "[don't insist on auth "
2522 "for callout]");
2523 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2524 break;
2525 }
2526 if (debug)
2527 log(-1, "[access denied]\n");
2528 lcp.Close(sp);
2529 break;
2530 }
2531 }
2532 if (debug)
2533 log(-1, "\n");
2534 free (buf, M_TEMP);
2535 return;
2536 }
2537
2538 /*
2539 * Analyze the LCP Configure-NAK option list, and adjust our
2540 * negotiation.
2541 */
2542 static void
sppp_lcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)2543 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2544 {
2545 STDDCL;
2546 u_char *buf, *p;
2547 u_long magic;
2548
2549 len -= 4;
2550 buf = malloc (len, M_TEMP, M_NOWAIT);
2551 if (!buf)
2552 return;
2553
2554 if (debug)
2555 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2556 SPP_ARGS(ifp));
2557
2558 p = (void*) (h+1);
2559 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2560 len -= p[1], p += p[1]) {
2561 if (debug)
2562 log(-1, " %s ", sppp_lcp_opt_name(*p));
2563 switch (*p) {
2564 case LCP_OPT_MAGIC:
2565 /* Magic number -- renegotiate */
2566 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2567 len >= 6 && p[1] == 6) {
2568 magic = (u_long)p[2] << 24 |
2569 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2570 /*
2571 * If the remote magic is our negated one,
2572 * this looks like a loopback problem.
2573 * Suggest a new magic to make sure.
2574 */
2575 if (magic == ~sp->lcp.magic) {
2576 if (debug)
2577 log(-1, "magic glitch ");
2578 sp->lcp.magic = random();
2579 } else {
2580 sp->lcp.magic = magic;
2581 if (debug)
2582 log(-1, "%lu ", magic);
2583 }
2584 }
2585 break;
2586 case LCP_OPT_MRU:
2587 /*
2588 * Peer wants to advise us to negotiate an MRU.
2589 * Agree on it if it's reasonable, or use
2590 * default otherwise.
2591 */
2592 if (len >= 4 && p[1] == 4) {
2593 u_int mru = p[2] * 256 + p[3];
2594 if (debug)
2595 log(-1, "%d ", mru);
2596 if (mru < PP_MTU || mru > PP_MAX_MRU)
2597 mru = PP_MTU;
2598 sp->lcp.mru = mru;
2599 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2600 }
2601 break;
2602 case LCP_OPT_AUTH_PROTO:
2603 /*
2604 * Peer doesn't like our authentication method,
2605 * deny.
2606 */
2607 if (debug)
2608 log(-1, "[access denied]\n");
2609 lcp.Close(sp);
2610 break;
2611 }
2612 }
2613 if (debug)
2614 log(-1, "\n");
2615 free (buf, M_TEMP);
2616 return;
2617 }
2618
2619 static void
sppp_lcp_tlu(struct sppp * sp)2620 sppp_lcp_tlu(struct sppp *sp)
2621 {
2622 STDDCL;
2623 int i;
2624 u_long mask;
2625
2626 /* XXX ? */
2627 if (! (ifp->if_flags & IFF_UP) &&
2628 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2629 /* Coming out of loopback mode. */
2630 if_up(ifp);
2631 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2632 }
2633
2634 for (i = 0; i < IDX_COUNT; i++)
2635 if ((cps[i])->flags & CP_QUAL)
2636 (cps[i])->Open(sp);
2637
2638 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2639 (sp->pp_flags & PP_NEEDAUTH) != 0)
2640 sp->pp_phase = PHASE_AUTHENTICATE;
2641 else
2642 sp->pp_phase = PHASE_NETWORK;
2643
2644 if (debug)
2645 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2646 sppp_phase_name(sp->pp_phase));
2647
2648 /*
2649 * Open all authentication protocols. This is even required
2650 * if we already proceeded to network phase, since it might be
2651 * that remote wants us to authenticate, so we might have to
2652 * send a PAP request. Undesired authentication protocols
2653 * don't do anything when they get an Open event.
2654 */
2655 for (i = 0; i < IDX_COUNT; i++)
2656 if ((cps[i])->flags & CP_AUTH)
2657 (cps[i])->Open(sp);
2658
2659 if (sp->pp_phase == PHASE_NETWORK) {
2660 /* Notify all NCPs. */
2661 for (i = 0; i < IDX_COUNT; i++)
2662 if (((cps[i])->flags & CP_NCP) &&
2663 /*
2664 * XXX
2665 * Hack to administratively disable IPv6 if
2666 * not desired. Perhaps we should have another
2667 * flag for this, but right now, we can make
2668 * all struct cp's read/only.
2669 */
2670 (cps[i] != &ipv6cp ||
2671 (sp->confflags & CONF_ENABLE_IPV6)))
2672 (cps[i])->Open(sp);
2673 }
2674
2675 /* Send Up events to all started protos. */
2676 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2677 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2678 (cps[i])->Up(sp);
2679
2680 /* notify low-level driver of state change */
2681 if (sp->pp_chg)
2682 sp->pp_chg(sp, (int)sp->pp_phase);
2683
2684 if (sp->pp_phase == PHASE_NETWORK)
2685 /* if no NCP is starting, close down */
2686 sppp_lcp_check_and_close(sp);
2687 }
2688
2689 static void
sppp_lcp_tld(struct sppp * sp)2690 sppp_lcp_tld(struct sppp *sp)
2691 {
2692 STDDCL;
2693 int i;
2694 u_long mask;
2695
2696 sp->pp_phase = PHASE_TERMINATE;
2697
2698 if (debug)
2699 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2700 sppp_phase_name(sp->pp_phase));
2701
2702 /*
2703 * Take upper layers down. We send the Down event first and
2704 * the Close second to prevent the upper layers from sending
2705 * ``a flurry of terminate-request packets'', as the RFC
2706 * describes it.
2707 */
2708 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2709 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2710 (cps[i])->Down(sp);
2711 (cps[i])->Close(sp);
2712 }
2713 }
2714
2715 static void
sppp_lcp_tls(struct sppp * sp)2716 sppp_lcp_tls(struct sppp *sp)
2717 {
2718 STDDCL;
2719
2720 sp->pp_phase = PHASE_ESTABLISH;
2721
2722 if (debug)
2723 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2724 sppp_phase_name(sp->pp_phase));
2725
2726 /* Notify lower layer if desired. */
2727 if (sp->pp_tls)
2728 (sp->pp_tls)(sp);
2729 else
2730 (sp->pp_up)(sp);
2731 }
2732
2733 static void
sppp_lcp_tlf(struct sppp * sp)2734 sppp_lcp_tlf(struct sppp *sp)
2735 {
2736 STDDCL;
2737
2738 sp->pp_phase = PHASE_DEAD;
2739 if (debug)
2740 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2741 sppp_phase_name(sp->pp_phase));
2742
2743 /* Notify lower layer if desired. */
2744 if (sp->pp_tlf)
2745 (sp->pp_tlf)(sp);
2746 else
2747 (sp->pp_down)(sp);
2748 }
2749
2750 static void
sppp_lcp_scr(struct sppp * sp)2751 sppp_lcp_scr(struct sppp *sp)
2752 {
2753 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2754 int i = 0;
2755 u_short authproto;
2756
2757 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2758 if (! sp->lcp.magic)
2759 sp->lcp.magic = random();
2760 opt[i++] = LCP_OPT_MAGIC;
2761 opt[i++] = 6;
2762 opt[i++] = sp->lcp.magic >> 24;
2763 opt[i++] = sp->lcp.magic >> 16;
2764 opt[i++] = sp->lcp.magic >> 8;
2765 opt[i++] = sp->lcp.magic;
2766 }
2767
2768 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2769 opt[i++] = LCP_OPT_MRU;
2770 opt[i++] = 4;
2771 opt[i++] = sp->lcp.mru >> 8;
2772 opt[i++] = sp->lcp.mru;
2773 }
2774
2775 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2776 authproto = sp->hisauth.proto;
2777 opt[i++] = LCP_OPT_AUTH_PROTO;
2778 opt[i++] = authproto == PPP_CHAP? 5: 4;
2779 opt[i++] = authproto >> 8;
2780 opt[i++] = authproto;
2781 if (authproto == PPP_CHAP)
2782 opt[i++] = CHAP_MD5;
2783 }
2784
2785 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2786 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2787 }
2788
2789 /*
2790 * Check the open NCPs, return true if at least one NCP is open.
2791 */
2792 static int
sppp_ncp_check(struct sppp * sp)2793 sppp_ncp_check(struct sppp *sp)
2794 {
2795 int i, mask;
2796
2797 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2798 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2799 return 1;
2800 return 0;
2801 }
2802
2803 /*
2804 * Re-check the open NCPs and see if we should terminate the link.
2805 * Called by the NCPs during their tlf action handling.
2806 */
2807 static void
sppp_lcp_check_and_close(struct sppp * sp)2808 sppp_lcp_check_and_close(struct sppp *sp)
2809 {
2810
2811 if (sp->pp_phase < PHASE_NETWORK)
2812 /* don't bother, we are already going down */
2813 return;
2814
2815 if (sppp_ncp_check(sp))
2816 return;
2817
2818 lcp.Close(sp);
2819 }
2820
2821 /*
2822 *--------------------------------------------------------------------------*
2823 * *
2824 * The IPCP implementation. *
2825 * *
2826 *--------------------------------------------------------------------------*
2827 */
2828
2829 #ifdef INET
2830 static void
sppp_ipcp_init(struct sppp * sp)2831 sppp_ipcp_init(struct sppp *sp)
2832 {
2833 sp->ipcp.opts = 0;
2834 sp->ipcp.flags = 0;
2835 sp->state[IDX_IPCP] = STATE_INITIAL;
2836 sp->fail_counter[IDX_IPCP] = 0;
2837 sp->pp_seq[IDX_IPCP] = 0;
2838 sp->pp_rseq[IDX_IPCP] = 0;
2839 callout_init(&sp->ch[IDX_IPCP], 1);
2840 }
2841
2842 static void
sppp_ipcp_up(struct sppp * sp)2843 sppp_ipcp_up(struct sppp *sp)
2844 {
2845 sppp_up_event(&ipcp, sp);
2846 }
2847
2848 static void
sppp_ipcp_down(struct sppp * sp)2849 sppp_ipcp_down(struct sppp *sp)
2850 {
2851 sppp_down_event(&ipcp, sp);
2852 }
2853
2854 static void
sppp_ipcp_open(struct sppp * sp)2855 sppp_ipcp_open(struct sppp *sp)
2856 {
2857 STDDCL;
2858 u_long myaddr, hisaddr;
2859
2860 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2861 IPCP_MYADDR_DYN | IPCP_VJ);
2862 sp->ipcp.opts = 0;
2863
2864 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2865 /*
2866 * If we don't have his address, this probably means our
2867 * interface doesn't want to talk IP at all. (This could
2868 * be the case if somebody wants to speak only IPX, for
2869 * example.) Don't open IPCP in this case.
2870 */
2871 if (hisaddr == 0L) {
2872 /* XXX this message should go away */
2873 if (debug)
2874 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2875 SPP_ARGS(ifp));
2876 return;
2877 }
2878 if (myaddr == 0L) {
2879 /*
2880 * I don't have an assigned address, so i need to
2881 * negotiate my address.
2882 */
2883 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2884 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2885 } else
2886 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2887 if (sp->confflags & CONF_ENABLE_VJ) {
2888 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2889 sp->ipcp.max_state = MAX_STATES - 1;
2890 sp->ipcp.compress_cid = 1;
2891 }
2892 sppp_open_event(&ipcp, sp);
2893 }
2894
2895 static void
sppp_ipcp_close(struct sppp * sp)2896 sppp_ipcp_close(struct sppp *sp)
2897 {
2898 sppp_close_event(&ipcp, sp);
2899 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2900 /*
2901 * My address was dynamic, clear it again.
2902 */
2903 sppp_set_ip_addr(sp, 0L);
2904 }
2905
2906 static void
sppp_ipcp_TO(void * cookie)2907 sppp_ipcp_TO(void *cookie)
2908 {
2909 sppp_to_event(&ipcp, (struct sppp *)cookie);
2910 }
2911
2912 /*
2913 * Analyze a configure request. Return true if it was agreeable, and
2914 * caused action sca, false if it has been rejected or nak'ed, and
2915 * caused action scn. (The return value is used to make the state
2916 * transition decision in the state automaton.)
2917 */
2918 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2919 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2920 {
2921 u_char *buf, *r, *p;
2922 struct ifnet *ifp = SP2IFP(sp);
2923 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2924 u_long hisaddr, desiredaddr;
2925 int gotmyaddr = 0;
2926 int desiredcomp;
2927
2928 len -= 4;
2929 origlen = len;
2930 /*
2931 * Make sure to allocate a buf that can at least hold a
2932 * conf-nak with an `address' option. We might need it below.
2933 */
2934 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2935 if (! buf)
2936 return (0);
2937
2938 /* pass 1: see if we can recognize them */
2939 if (debug)
2940 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2941 SPP_ARGS(ifp));
2942 p = (void*) (h+1);
2943 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2944 len-=p[1], p+=p[1]) {
2945 if (debug)
2946 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2947 switch (*p) {
2948 case IPCP_OPT_COMPRESSION:
2949 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2950 /* VJ compression administratively disabled */
2951 if (debug)
2952 log(-1, "[locally disabled] ");
2953 break;
2954 }
2955 /*
2956 * In theory, we should only conf-rej an
2957 * option that is shorter than RFC 1618
2958 * requires (i.e. < 4), and should conf-nak
2959 * anything else that is not VJ. However,
2960 * since our algorithm always uses the
2961 * original option to NAK it with new values,
2962 * things would become more complicated. In
2963 * practice, the only commonly implemented IP
2964 * compression option is VJ anyway, so the
2965 * difference is negligible.
2966 */
2967 if (len >= 6 && p[1] == 6) {
2968 /*
2969 * correctly formed compression option
2970 * that could be VJ compression
2971 */
2972 continue;
2973 }
2974 if (debug)
2975 log(-1,
2976 "optlen %d [invalid/unsupported] ",
2977 p[1]);
2978 break;
2979 case IPCP_OPT_ADDRESS:
2980 if (len >= 6 && p[1] == 6) {
2981 /* correctly formed address option */
2982 continue;
2983 }
2984 if (debug)
2985 log(-1, "[invalid] ");
2986 break;
2987 default:
2988 /* Others not supported. */
2989 if (debug)
2990 log(-1, "[rej] ");
2991 break;
2992 }
2993 /* Add the option to rejected list. */
2994 bcopy (p, r, p[1]);
2995 r += p[1];
2996 rlen += p[1];
2997 }
2998 if (rlen) {
2999 if (debug)
3000 log(-1, " send conf-rej\n");
3001 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3002 return 0;
3003 } else if (debug)
3004 log(-1, "\n");
3005
3006 /* pass 2: parse option values */
3007 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3008 if (debug)
3009 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3010 SPP_ARGS(ifp));
3011 p = (void*) (h+1);
3012 len = origlen;
3013 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3014 len-=p[1], p+=p[1]) {
3015 if (debug)
3016 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3017 switch (*p) {
3018 case IPCP_OPT_COMPRESSION:
3019 desiredcomp = p[2] << 8 | p[3];
3020 /* We only support VJ */
3021 if (desiredcomp == IPCP_COMP_VJ) {
3022 if (debug)
3023 log(-1, "VJ [ack] ");
3024 sp->ipcp.flags |= IPCP_VJ;
3025 sl_compress_init(sp->pp_comp, p[4]);
3026 sp->ipcp.max_state = p[4];
3027 sp->ipcp.compress_cid = p[5];
3028 continue;
3029 }
3030 if (debug)
3031 log(-1,
3032 "compproto %#04x [not supported] ",
3033 desiredcomp);
3034 p[2] = IPCP_COMP_VJ >> 8;
3035 p[3] = IPCP_COMP_VJ;
3036 p[4] = sp->ipcp.max_state;
3037 p[5] = sp->ipcp.compress_cid;
3038 break;
3039 case IPCP_OPT_ADDRESS:
3040 /* This is the address he wants in his end */
3041 desiredaddr = p[2] << 24 | p[3] << 16 |
3042 p[4] << 8 | p[5];
3043 if (desiredaddr == hisaddr ||
3044 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3045 /*
3046 * Peer's address is same as our value,
3047 * or we have set it to 0.0.0.* to
3048 * indicate that we do not really care,
3049 * this is agreeable. Gonna conf-ack
3050 * it.
3051 */
3052 if (debug)
3053 log(-1, "%s [ack] ",
3054 sppp_dotted_quad(hisaddr));
3055 /* record that we've seen it already */
3056 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3057 continue;
3058 }
3059 /*
3060 * The address wasn't agreeable. This is either
3061 * he sent us 0.0.0.0, asking to assign him an
3062 * address, or he send us another address not
3063 * matching our value. Either case, we gonna
3064 * conf-nak it with our value.
3065 * XXX: we should "rej" if hisaddr == 0
3066 */
3067 if (debug) {
3068 if (desiredaddr == 0)
3069 log(-1, "[addr requested] ");
3070 else
3071 log(-1, "%s [not agreed] ",
3072 sppp_dotted_quad(desiredaddr));
3073
3074 }
3075 p[2] = hisaddr >> 24;
3076 p[3] = hisaddr >> 16;
3077 p[4] = hisaddr >> 8;
3078 p[5] = hisaddr;
3079 break;
3080 }
3081 /* Add the option to nak'ed list. */
3082 bcopy (p, r, p[1]);
3083 r += p[1];
3084 rlen += p[1];
3085 }
3086
3087 /*
3088 * If we are about to conf-ack the request, but haven't seen
3089 * his address so far, gonna conf-nak it instead, with the
3090 * `address' option present and our idea of his address being
3091 * filled in there, to request negotiation of both addresses.
3092 *
3093 * XXX This can result in an endless req - nak loop if peer
3094 * doesn't want to send us his address. Q: What should we do
3095 * about it? XXX A: implement the max-failure counter.
3096 */
3097 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3098 buf[0] = IPCP_OPT_ADDRESS;
3099 buf[1] = 6;
3100 buf[2] = hisaddr >> 24;
3101 buf[3] = hisaddr >> 16;
3102 buf[4] = hisaddr >> 8;
3103 buf[5] = hisaddr;
3104 rlen = 6;
3105 if (debug)
3106 log(-1, "still need hisaddr ");
3107 }
3108
3109 if (rlen) {
3110 if (debug)
3111 log(-1, " send conf-nak\n");
3112 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3113 } else {
3114 if (debug)
3115 log(-1, " send conf-ack\n");
3116 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3117 h->ident, origlen, h+1);
3118 }
3119
3120 free (buf, M_TEMP);
3121 return (rlen == 0);
3122 }
3123
3124 /*
3125 * Analyze the IPCP Configure-Reject option list, and adjust our
3126 * negotiation.
3127 */
3128 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3129 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3130 {
3131 u_char *buf, *p;
3132 struct ifnet *ifp = SP2IFP(sp);
3133 int debug = ifp->if_flags & IFF_DEBUG;
3134
3135 len -= 4;
3136 buf = malloc (len, M_TEMP, M_NOWAIT);
3137 if (!buf)
3138 return;
3139
3140 if (debug)
3141 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3142 SPP_ARGS(ifp));
3143
3144 p = (void*) (h+1);
3145 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3146 len -= p[1], p += p[1]) {
3147 if (debug)
3148 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3149 switch (*p) {
3150 case IPCP_OPT_COMPRESSION:
3151 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3152 break;
3153 case IPCP_OPT_ADDRESS:
3154 /*
3155 * Peer doesn't grok address option. This is
3156 * bad. XXX Should we better give up here?
3157 * XXX We could try old "addresses" option...
3158 */
3159 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3160 break;
3161 }
3162 }
3163 if (debug)
3164 log(-1, "\n");
3165 free (buf, M_TEMP);
3166 return;
3167 }
3168
3169 /*
3170 * Analyze the IPCP Configure-NAK option list, and adjust our
3171 * negotiation.
3172 */
3173 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3174 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3175 {
3176 u_char *buf, *p;
3177 struct ifnet *ifp = SP2IFP(sp);
3178 int debug = ifp->if_flags & IFF_DEBUG;
3179 int desiredcomp;
3180 u_long wantaddr;
3181
3182 len -= 4;
3183 buf = malloc (len, M_TEMP, M_NOWAIT);
3184 if (!buf)
3185 return;
3186
3187 if (debug)
3188 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3189 SPP_ARGS(ifp));
3190
3191 p = (void*) (h+1);
3192 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3193 len -= p[1], p += p[1]) {
3194 if (debug)
3195 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3196 switch (*p) {
3197 case IPCP_OPT_COMPRESSION:
3198 if (len >= 6 && p[1] == 6) {
3199 desiredcomp = p[2] << 8 | p[3];
3200 if (debug)
3201 log(-1, "[wantcomp %#04x] ",
3202 desiredcomp);
3203 if (desiredcomp == IPCP_COMP_VJ) {
3204 sl_compress_init(sp->pp_comp, p[4]);
3205 sp->ipcp.max_state = p[4];
3206 sp->ipcp.compress_cid = p[5];
3207 if (debug)
3208 log(-1, "[agree] ");
3209 } else
3210 sp->ipcp.opts &=
3211 ~(1 << IPCP_OPT_COMPRESSION);
3212 }
3213 break;
3214 case IPCP_OPT_ADDRESS:
3215 /*
3216 * Peer doesn't like our local IP address. See
3217 * if we can do something for him. We'll drop
3218 * him our address then.
3219 */
3220 if (len >= 6 && p[1] == 6) {
3221 wantaddr = p[2] << 24 | p[3] << 16 |
3222 p[4] << 8 | p[5];
3223 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3224 if (debug)
3225 log(-1, "[wantaddr %s] ",
3226 sppp_dotted_quad(wantaddr));
3227 /*
3228 * When doing dynamic address assignment,
3229 * we accept his offer. Otherwise, we
3230 * ignore it and thus continue to negotiate
3231 * our already existing value.
3232 * XXX: Bogus, if he said no once, he'll
3233 * just say no again, might as well die.
3234 */
3235 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3236 sppp_set_ip_addr(sp, wantaddr);
3237 if (debug)
3238 log(-1, "[agree] ");
3239 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3240 }
3241 }
3242 break;
3243 }
3244 }
3245 if (debug)
3246 log(-1, "\n");
3247 free (buf, M_TEMP);
3248 return;
3249 }
3250
3251 static void
sppp_ipcp_tlu(struct sppp * sp)3252 sppp_ipcp_tlu(struct sppp *sp)
3253 {
3254 /* we are up - notify isdn daemon */
3255 if (sp->pp_con)
3256 sp->pp_con(sp);
3257 }
3258
3259 static void
sppp_ipcp_tld(struct sppp * sp)3260 sppp_ipcp_tld(struct sppp *sp)
3261 {
3262 }
3263
3264 static void
sppp_ipcp_tls(struct sppp * sp)3265 sppp_ipcp_tls(struct sppp *sp)
3266 {
3267 /* indicate to LCP that it must stay alive */
3268 sp->lcp.protos |= (1 << IDX_IPCP);
3269 }
3270
3271 static void
sppp_ipcp_tlf(struct sppp * sp)3272 sppp_ipcp_tlf(struct sppp *sp)
3273 {
3274 /* we no longer need LCP */
3275 sp->lcp.protos &= ~(1 << IDX_IPCP);
3276 sppp_lcp_check_and_close(sp);
3277 }
3278
3279 static void
sppp_ipcp_scr(struct sppp * sp)3280 sppp_ipcp_scr(struct sppp *sp)
3281 {
3282 char opt[6 /* compression */ + 6 /* address */];
3283 u_long ouraddr;
3284 int i = 0;
3285
3286 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3287 opt[i++] = IPCP_OPT_COMPRESSION;
3288 opt[i++] = 6;
3289 opt[i++] = IPCP_COMP_VJ >> 8;
3290 opt[i++] = IPCP_COMP_VJ;
3291 opt[i++] = sp->ipcp.max_state;
3292 opt[i++] = sp->ipcp.compress_cid;
3293 }
3294 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3295 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3296 opt[i++] = IPCP_OPT_ADDRESS;
3297 opt[i++] = 6;
3298 opt[i++] = ouraddr >> 24;
3299 opt[i++] = ouraddr >> 16;
3300 opt[i++] = ouraddr >> 8;
3301 opt[i++] = ouraddr;
3302 }
3303
3304 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3305 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3306 }
3307 #else /* !INET */
3308 static void
sppp_ipcp_init(struct sppp * sp)3309 sppp_ipcp_init(struct sppp *sp)
3310 {
3311 }
3312
3313 static void
sppp_ipcp_up(struct sppp * sp)3314 sppp_ipcp_up(struct sppp *sp)
3315 {
3316 }
3317
3318 static void
sppp_ipcp_down(struct sppp * sp)3319 sppp_ipcp_down(struct sppp *sp)
3320 {
3321 }
3322
3323 static void
sppp_ipcp_open(struct sppp * sp)3324 sppp_ipcp_open(struct sppp *sp)
3325 {
3326 }
3327
3328 static void
sppp_ipcp_close(struct sppp * sp)3329 sppp_ipcp_close(struct sppp *sp)
3330 {
3331 }
3332
3333 static void
sppp_ipcp_TO(void * cookie)3334 sppp_ipcp_TO(void *cookie)
3335 {
3336 }
3337
3338 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)3339 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3340 {
3341 return (0);
3342 }
3343
3344 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3345 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3346 {
3347 }
3348
3349 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3350 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3351 {
3352 }
3353
3354 static void
sppp_ipcp_tlu(struct sppp * sp)3355 sppp_ipcp_tlu(struct sppp *sp)
3356 {
3357 }
3358
3359 static void
sppp_ipcp_tld(struct sppp * sp)3360 sppp_ipcp_tld(struct sppp *sp)
3361 {
3362 }
3363
3364 static void
sppp_ipcp_tls(struct sppp * sp)3365 sppp_ipcp_tls(struct sppp *sp)
3366 {
3367 }
3368
3369 static void
sppp_ipcp_tlf(struct sppp * sp)3370 sppp_ipcp_tlf(struct sppp *sp)
3371 {
3372 }
3373
3374 static void
sppp_ipcp_scr(struct sppp * sp)3375 sppp_ipcp_scr(struct sppp *sp)
3376 {
3377 }
3378 #endif
3379
3380 /*
3381 *--------------------------------------------------------------------------*
3382 * *
3383 * The IPv6CP implementation. *
3384 * *
3385 *--------------------------------------------------------------------------*
3386 */
3387
3388 #ifdef INET6
3389 static void
sppp_ipv6cp_init(struct sppp * sp)3390 sppp_ipv6cp_init(struct sppp *sp)
3391 {
3392 sp->ipv6cp.opts = 0;
3393 sp->ipv6cp.flags = 0;
3394 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3395 sp->fail_counter[IDX_IPV6CP] = 0;
3396 sp->pp_seq[IDX_IPV6CP] = 0;
3397 sp->pp_rseq[IDX_IPV6CP] = 0;
3398 callout_init(&sp->ch[IDX_IPV6CP], 1);
3399 }
3400
3401 static void
sppp_ipv6cp_up(struct sppp * sp)3402 sppp_ipv6cp_up(struct sppp *sp)
3403 {
3404 sppp_up_event(&ipv6cp, sp);
3405 }
3406
3407 static void
sppp_ipv6cp_down(struct sppp * sp)3408 sppp_ipv6cp_down(struct sppp *sp)
3409 {
3410 sppp_down_event(&ipv6cp, sp);
3411 }
3412
3413 static void
sppp_ipv6cp_open(struct sppp * sp)3414 sppp_ipv6cp_open(struct sppp *sp)
3415 {
3416 STDDCL;
3417 struct in6_addr myaddr, hisaddr;
3418
3419 #ifdef IPV6CP_MYIFID_DYN
3420 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3421 #else
3422 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3423 #endif
3424
3425 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3426 /*
3427 * If we don't have our address, this probably means our
3428 * interface doesn't want to talk IPv6 at all. (This could
3429 * be the case if somebody wants to speak only IPX, for
3430 * example.) Don't open IPv6CP in this case.
3431 */
3432 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3433 /* XXX this message should go away */
3434 if (debug)
3435 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3436 SPP_ARGS(ifp));
3437 return;
3438 }
3439
3440 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3441 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3442 sppp_open_event(&ipv6cp, sp);
3443 }
3444
3445 static void
sppp_ipv6cp_close(struct sppp * sp)3446 sppp_ipv6cp_close(struct sppp *sp)
3447 {
3448 sppp_close_event(&ipv6cp, sp);
3449 }
3450
3451 static void
sppp_ipv6cp_TO(void * cookie)3452 sppp_ipv6cp_TO(void *cookie)
3453 {
3454 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3455 }
3456
3457 /*
3458 * Analyze a configure request. Return true if it was agreeable, and
3459 * caused action sca, false if it has been rejected or nak'ed, and
3460 * caused action scn. (The return value is used to make the state
3461 * transition decision in the state automaton.)
3462 */
3463 static int
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3464 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3465 {
3466 u_char *buf, *r, *p;
3467 struct ifnet *ifp = SP2IFP(sp);
3468 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3469 struct in6_addr myaddr, desiredaddr, suggestaddr;
3470 int ifidcount;
3471 int type;
3472 int collision, nohisaddr;
3473 char ip6buf[INET6_ADDRSTRLEN];
3474
3475 len -= 4;
3476 origlen = len;
3477 /*
3478 * Make sure to allocate a buf that can at least hold a
3479 * conf-nak with an `address' option. We might need it below.
3480 */
3481 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3482 if (! buf)
3483 return (0);
3484
3485 /* pass 1: see if we can recognize them */
3486 if (debug)
3487 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3488 SPP_ARGS(ifp));
3489 p = (void*) (h+1);
3490 ifidcount = 0;
3491 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3492 len-=p[1], p+=p[1]) {
3493 if (debug)
3494 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3495 switch (*p) {
3496 case IPV6CP_OPT_IFID:
3497 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3498 /* correctly formed address option */
3499 ifidcount++;
3500 continue;
3501 }
3502 if (debug)
3503 log(-1, " [invalid]");
3504 break;
3505 #ifdef notyet
3506 case IPV6CP_OPT_COMPRESSION:
3507 if (len >= 4 && p[1] >= 4) {
3508 /* correctly formed compress option */
3509 continue;
3510 }
3511 if (debug)
3512 log(-1, " [invalid]");
3513 break;
3514 #endif
3515 default:
3516 /* Others not supported. */
3517 if (debug)
3518 log(-1, " [rej]");
3519 break;
3520 }
3521 /* Add the option to rejected list. */
3522 bcopy (p, r, p[1]);
3523 r += p[1];
3524 rlen += p[1];
3525 }
3526 if (rlen) {
3527 if (debug)
3528 log(-1, " send conf-rej\n");
3529 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3530 goto end;
3531 } else if (debug)
3532 log(-1, "\n");
3533
3534 /* pass 2: parse option values */
3535 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3536 if (debug)
3537 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3538 SPP_ARGS(ifp));
3539 p = (void*) (h+1);
3540 len = origlen;
3541 type = CONF_ACK;
3542 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3543 len-=p[1], p+=p[1]) {
3544 if (debug)
3545 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3546 switch (*p) {
3547 #ifdef notyet
3548 case IPV6CP_OPT_COMPRESSION:
3549 continue;
3550 #endif
3551 case IPV6CP_OPT_IFID:
3552 bzero(&desiredaddr, sizeof(desiredaddr));
3553 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3554 collision = (bcmp(&desiredaddr.s6_addr[8],
3555 &myaddr.s6_addr[8], 8) == 0);
3556 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3557
3558 desiredaddr.s6_addr16[0] = htons(0xfe80);
3559 (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3560
3561 if (!collision && !nohisaddr) {
3562 /* no collision, hisaddr known - Conf-Ack */
3563 type = CONF_ACK;
3564
3565 if (debug) {
3566 log(-1, " %s [%s]",
3567 ip6_sprintf(ip6buf, &desiredaddr),
3568 sppp_cp_type_name(type));
3569 }
3570 continue;
3571 }
3572
3573 bzero(&suggestaddr, sizeof(suggestaddr));
3574 if (collision && nohisaddr) {
3575 /* collision, hisaddr unknown - Conf-Rej */
3576 type = CONF_REJ;
3577 bzero(&p[2], 8);
3578 } else {
3579 /*
3580 * - no collision, hisaddr unknown, or
3581 * - collision, hisaddr known
3582 * Conf-Nak, suggest hisaddr
3583 */
3584 type = CONF_NAK;
3585 sppp_suggest_ip6_addr(sp, &suggestaddr);
3586 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3587 }
3588 if (debug)
3589 log(-1, " %s [%s]",
3590 ip6_sprintf(ip6buf, &desiredaddr),
3591 sppp_cp_type_name(type));
3592 break;
3593 }
3594 /* Add the option to nak'ed list. */
3595 bcopy (p, r, p[1]);
3596 r += p[1];
3597 rlen += p[1];
3598 }
3599
3600 if (rlen == 0 && type == CONF_ACK) {
3601 if (debug)
3602 log(-1, " send %s\n", sppp_cp_type_name(type));
3603 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3604 } else {
3605 #ifdef DIAGNOSTIC
3606 if (type == CONF_ACK)
3607 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3608 #endif
3609
3610 if (debug) {
3611 log(-1, " send %s suggest %s\n",
3612 sppp_cp_type_name(type),
3613 ip6_sprintf(ip6buf, &suggestaddr));
3614 }
3615 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3616 }
3617
3618 end:
3619 free (buf, M_TEMP);
3620 return (rlen == 0);
3621 }
3622
3623 /*
3624 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3625 * negotiation.
3626 */
3627 static void
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3628 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3629 {
3630 u_char *buf, *p;
3631 struct ifnet *ifp = SP2IFP(sp);
3632 int debug = ifp->if_flags & IFF_DEBUG;
3633
3634 len -= 4;
3635 buf = malloc (len, M_TEMP, M_NOWAIT);
3636 if (!buf)
3637 return;
3638
3639 if (debug)
3640 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3641 SPP_ARGS(ifp));
3642
3643 p = (void*) (h+1);
3644 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3645 len -= p[1], p += p[1]) {
3646 if (debug)
3647 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3648 switch (*p) {
3649 case IPV6CP_OPT_IFID:
3650 /*
3651 * Peer doesn't grok address option. This is
3652 * bad. XXX Should we better give up here?
3653 */
3654 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3655 break;
3656 #ifdef notyet
3657 case IPV6CP_OPT_COMPRESS:
3658 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3659 break;
3660 #endif
3661 }
3662 }
3663 if (debug)
3664 log(-1, "\n");
3665 free (buf, M_TEMP);
3666 return;
3667 }
3668
3669 /*
3670 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3671 * negotiation.
3672 */
3673 static void
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3674 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3675 {
3676 u_char *buf, *p;
3677 struct ifnet *ifp = SP2IFP(sp);
3678 int debug = ifp->if_flags & IFF_DEBUG;
3679 struct in6_addr suggestaddr;
3680 char ip6buf[INET6_ADDRSTRLEN];
3681
3682 len -= 4;
3683 buf = malloc (len, M_TEMP, M_NOWAIT);
3684 if (!buf)
3685 return;
3686
3687 if (debug)
3688 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3689 SPP_ARGS(ifp));
3690
3691 p = (void*) (h+1);
3692 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3693 len -= p[1], p += p[1]) {
3694 if (debug)
3695 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3696 switch (*p) {
3697 case IPV6CP_OPT_IFID:
3698 /*
3699 * Peer doesn't like our local ifid. See
3700 * if we can do something for him. We'll drop
3701 * him our address then.
3702 */
3703 if (len < 10 || p[1] != 10)
3704 break;
3705 bzero(&suggestaddr, sizeof(suggestaddr));
3706 suggestaddr.s6_addr16[0] = htons(0xfe80);
3707 (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3708 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3709
3710 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3711 if (debug)
3712 log(-1, " [suggestaddr %s]",
3713 ip6_sprintf(ip6buf, &suggestaddr));
3714 #ifdef IPV6CP_MYIFID_DYN
3715 /*
3716 * When doing dynamic address assignment,
3717 * we accept his offer.
3718 */
3719 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3720 struct in6_addr lastsuggest;
3721 /*
3722 * If <suggested myaddr from peer> equals to
3723 * <hisaddr we have suggested last time>,
3724 * we have a collision. generate new random
3725 * ifid.
3726 */
3727 sppp_suggest_ip6_addr(&lastsuggest);
3728 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3729 lastsuggest)) {
3730 if (debug)
3731 log(-1, " [random]");
3732 sppp_gen_ip6_addr(sp, &suggestaddr);
3733 }
3734 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3735 if (debug)
3736 log(-1, " [agree]");
3737 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3738 }
3739 #else
3740 /*
3741 * Since we do not do dynamic address assignment,
3742 * we ignore it and thus continue to negotiate
3743 * our already existing value. This can possibly
3744 * go into infinite request-reject loop.
3745 *
3746 * This is not likely because we normally use
3747 * ifid based on MAC-address.
3748 * If you have no ethernet card on the node, too bad.
3749 * XXX should we use fail_counter?
3750 */
3751 #endif
3752 break;
3753 #ifdef notyet
3754 case IPV6CP_OPT_COMPRESS:
3755 /*
3756 * Peer wants different compression parameters.
3757 */
3758 break;
3759 #endif
3760 }
3761 }
3762 if (debug)
3763 log(-1, "\n");
3764 free (buf, M_TEMP);
3765 return;
3766 }
3767 static void
sppp_ipv6cp_tlu(struct sppp * sp)3768 sppp_ipv6cp_tlu(struct sppp *sp)
3769 {
3770 /* we are up - notify isdn daemon */
3771 if (sp->pp_con)
3772 sp->pp_con(sp);
3773 }
3774
3775 static void
sppp_ipv6cp_tld(struct sppp * sp)3776 sppp_ipv6cp_tld(struct sppp *sp)
3777 {
3778 }
3779
3780 static void
sppp_ipv6cp_tls(struct sppp * sp)3781 sppp_ipv6cp_tls(struct sppp *sp)
3782 {
3783 /* indicate to LCP that it must stay alive */
3784 sp->lcp.protos |= (1 << IDX_IPV6CP);
3785 }
3786
3787 static void
sppp_ipv6cp_tlf(struct sppp * sp)3788 sppp_ipv6cp_tlf(struct sppp *sp)
3789 {
3790
3791 #if 0 /* need #if 0 to close IPv6CP properly */
3792 /* we no longer need LCP */
3793 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3794 sppp_lcp_check_and_close(sp);
3795 #endif
3796 }
3797
3798 static void
sppp_ipv6cp_scr(struct sppp * sp)3799 sppp_ipv6cp_scr(struct sppp *sp)
3800 {
3801 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3802 struct in6_addr ouraddr;
3803 int i = 0;
3804
3805 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3806 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3807 opt[i++] = IPV6CP_OPT_IFID;
3808 opt[i++] = 10;
3809 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3810 i += 8;
3811 }
3812
3813 #ifdef notyet
3814 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3815 opt[i++] = IPV6CP_OPT_COMPRESSION;
3816 opt[i++] = 4;
3817 opt[i++] = 0; /* TBD */
3818 opt[i++] = 0; /* TBD */
3819 /* variable length data may follow */
3820 }
3821 #endif
3822
3823 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3824 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3825 }
3826 #else /*INET6*/
sppp_ipv6cp_init(struct sppp * sp)3827 static void sppp_ipv6cp_init(struct sppp *sp)
3828 {
3829 }
3830
sppp_ipv6cp_up(struct sppp * sp)3831 static void sppp_ipv6cp_up(struct sppp *sp)
3832 {
3833 }
3834
sppp_ipv6cp_down(struct sppp * sp)3835 static void sppp_ipv6cp_down(struct sppp *sp)
3836 {
3837 }
3838
3839
sppp_ipv6cp_open(struct sppp * sp)3840 static void sppp_ipv6cp_open(struct sppp *sp)
3841 {
3842 }
3843
sppp_ipv6cp_close(struct sppp * sp)3844 static void sppp_ipv6cp_close(struct sppp *sp)
3845 {
3846 }
3847
sppp_ipv6cp_TO(void * sp)3848 static void sppp_ipv6cp_TO(void *sp)
3849 {
3850 }
3851
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3852 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3853 {
3854 return 0;
3855 }
3856
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3857 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3858 {
3859 }
3860
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3861 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3862 {
3863 }
3864
sppp_ipv6cp_tlu(struct sppp * sp)3865 static void sppp_ipv6cp_tlu(struct sppp *sp)
3866 {
3867 }
3868
sppp_ipv6cp_tld(struct sppp * sp)3869 static void sppp_ipv6cp_tld(struct sppp *sp)
3870 {
3871 }
3872
sppp_ipv6cp_tls(struct sppp * sp)3873 static void sppp_ipv6cp_tls(struct sppp *sp)
3874 {
3875 }
3876
sppp_ipv6cp_tlf(struct sppp * sp)3877 static void sppp_ipv6cp_tlf(struct sppp *sp)
3878 {
3879 }
3880
sppp_ipv6cp_scr(struct sppp * sp)3881 static void sppp_ipv6cp_scr(struct sppp *sp)
3882 {
3883 }
3884 #endif /*INET6*/
3885
3886 /*
3887 *--------------------------------------------------------------------------*
3888 * *
3889 * The CHAP implementation. *
3890 * *
3891 *--------------------------------------------------------------------------*
3892 */
3893
3894 /*
3895 * The authentication protocols don't employ a full-fledged state machine as
3896 * the control protocols do, since they do have Open and Close events, but
3897 * not Up and Down, nor are they explicitly terminated. Also, use of the
3898 * authentication protocols may be different in both directions (this makes
3899 * sense, think of a machine that never accepts incoming calls but only
3900 * calls out, it doesn't require the called party to authenticate itself).
3901 *
3902 * Our state machine for the local authentication protocol (we are requesting
3903 * the peer to authenticate) looks like:
3904 *
3905 * RCA-
3906 * +--------------------------------------------+
3907 * V scn,tld|
3908 * +--------+ Close +---------+ RCA+
3909 * | |<----------------------------------| |------+
3910 * +--->| Closed | TO* | Opened | sca |
3911 * | | |-----+ +-------| |<-----+
3912 * | +--------+ irc | | +---------+
3913 * | ^ | | ^
3914 * | | | | |
3915 * | | | | |
3916 * | TO-| | | |
3917 * | |tld TO+ V | |
3918 * | | +------->+ | |
3919 * | | | | | |
3920 * | +--------+ V | |
3921 * | | |<----+<--------------------+ |
3922 * | | Req- | scr |
3923 * | | Sent | |
3924 * | | | |
3925 * | +--------+ |
3926 * | RCA- | | RCA+ |
3927 * +------+ +------------------------------------------+
3928 * scn,tld sca,irc,ict,tlu
3929 *
3930 *
3931 * with:
3932 *
3933 * Open: LCP reached authentication phase
3934 * Close: LCP reached terminate phase
3935 *
3936 * RCA+: received reply (pap-req, chap-response), acceptable
3937 * RCN: received reply (pap-req, chap-response), not acceptable
3938 * TO+: timeout with restart counter >= 0
3939 * TO-: timeout with restart counter < 0
3940 * TO*: reschedule timeout for CHAP
3941 *
3942 * scr: send request packet (none for PAP, chap-challenge)
3943 * sca: send ack packet (pap-ack, chap-success)
3944 * scn: send nak packet (pap-nak, chap-failure)
3945 * ict: initialize re-challenge timer (CHAP only)
3946 *
3947 * tlu: this-layer-up, LCP reaches network phase
3948 * tld: this-layer-down, LCP enters terminate phase
3949 *
3950 * Note that in CHAP mode, after sending a new challenge, while the state
3951 * automaton falls back into Req-Sent state, it doesn't signal a tld
3952 * event to LCP, so LCP remains in network phase. Only after not getting
3953 * any response (or after getting an unacceptable response), CHAP closes,
3954 * causing LCP to enter terminate phase.
3955 *
3956 * With PAP, there is no initial request that can be sent. The peer is
3957 * expected to send one based on the successful negotiation of PAP as
3958 * the authentication protocol during the LCP option negotiation.
3959 *
3960 * Incoming authentication protocol requests (remote requests
3961 * authentication, we are peer) don't employ a state machine at all,
3962 * they are simply answered. Some peers [Ascend P50 firmware rev
3963 * 4.50] react allergically when sending IPCP requests while they are
3964 * still in authentication phase (thereby violating the standard that
3965 * demands that these NCP packets are to be discarded), so we keep
3966 * track of the peer demanding us to authenticate, and only proceed to
3967 * phase network once we've seen a positive acknowledge for the
3968 * authentication.
3969 */
3970
3971 /*
3972 * Handle incoming CHAP packets.
3973 */
3974 static void
sppp_chap_input(struct sppp * sp,struct mbuf * m)3975 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3976 {
3977 STDDCL;
3978 struct lcp_header *h;
3979 int len;
3980 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3981 int value_len, name_len;
3982 MD5_CTX ctx;
3983
3984 len = m->m_pkthdr.len;
3985 if (len < 4) {
3986 if (debug)
3987 log(LOG_DEBUG,
3988 SPP_FMT "chap invalid packet length: %d bytes\n",
3989 SPP_ARGS(ifp), len);
3990 return;
3991 }
3992 h = mtod (m, struct lcp_header*);
3993 if (len > ntohs (h->len))
3994 len = ntohs (h->len);
3995
3996 switch (h->type) {
3997 /* challenge, failure and success are his authproto */
3998 case CHAP_CHALLENGE:
3999 value = 1 + (u_char*)(h+1);
4000 value_len = value[-1];
4001 name = value + value_len;
4002 name_len = len - value_len - 5;
4003 if (name_len < 0) {
4004 if (debug) {
4005 log(LOG_DEBUG,
4006 SPP_FMT "chap corrupted challenge "
4007 "<%s id=0x%x len=%d",
4008 SPP_ARGS(ifp),
4009 sppp_auth_type_name(PPP_CHAP, h->type),
4010 h->ident, ntohs(h->len));
4011 sppp_print_bytes((u_char*) (h+1), len-4);
4012 log(-1, ">\n");
4013 }
4014 break;
4015 }
4016
4017 if (debug) {
4018 log(LOG_DEBUG,
4019 SPP_FMT "chap input <%s id=0x%x len=%d name=",
4020 SPP_ARGS(ifp),
4021 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4022 ntohs(h->len));
4023 sppp_print_string((char*) name, name_len);
4024 log(-1, " value-size=%d value=", value_len);
4025 sppp_print_bytes(value, value_len);
4026 log(-1, ">\n");
4027 }
4028
4029 /* Compute reply value. */
4030 MD5Init(&ctx);
4031 MD5Update(&ctx, &h->ident, 1);
4032 MD5Update(&ctx, sp->myauth.secret,
4033 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4034 MD5Update(&ctx, value, value_len);
4035 MD5Final(digest, &ctx);
4036 dsize = sizeof digest;
4037
4038 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4039 sizeof dsize, (const char *)&dsize,
4040 sizeof digest, digest,
4041 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4042 sp->myauth.name,
4043 0);
4044 break;
4045
4046 case CHAP_SUCCESS:
4047 if (debug) {
4048 log(LOG_DEBUG, SPP_FMT "chap success",
4049 SPP_ARGS(ifp));
4050 if (len > 4) {
4051 log(-1, ": ");
4052 sppp_print_string((char*)(h + 1), len - 4);
4053 }
4054 log(-1, "\n");
4055 }
4056 SPPP_LOCK(sp);
4057 sp->pp_flags &= ~PP_NEEDAUTH;
4058 if (sp->myauth.proto == PPP_CHAP &&
4059 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4060 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4061 /*
4062 * We are authenticator for CHAP but didn't
4063 * complete yet. Leave it to tlu to proceed
4064 * to network phase.
4065 */
4066 SPPP_UNLOCK(sp);
4067 break;
4068 }
4069 SPPP_UNLOCK(sp);
4070 sppp_phase_network(sp);
4071 break;
4072
4073 case CHAP_FAILURE:
4074 if (debug) {
4075 log(LOG_INFO, SPP_FMT "chap failure",
4076 SPP_ARGS(ifp));
4077 if (len > 4) {
4078 log(-1, ": ");
4079 sppp_print_string((char*)(h + 1), len - 4);
4080 }
4081 log(-1, "\n");
4082 } else
4083 log(LOG_INFO, SPP_FMT "chap failure\n",
4084 SPP_ARGS(ifp));
4085 /* await LCP shutdown by authenticator */
4086 break;
4087
4088 /* response is my authproto */
4089 case CHAP_RESPONSE:
4090 value = 1 + (u_char*)(h+1);
4091 value_len = value[-1];
4092 name = value + value_len;
4093 name_len = len - value_len - 5;
4094 if (name_len < 0) {
4095 if (debug) {
4096 log(LOG_DEBUG,
4097 SPP_FMT "chap corrupted response "
4098 "<%s id=0x%x len=%d",
4099 SPP_ARGS(ifp),
4100 sppp_auth_type_name(PPP_CHAP, h->type),
4101 h->ident, ntohs(h->len));
4102 sppp_print_bytes((u_char*)(h+1), len-4);
4103 log(-1, ">\n");
4104 }
4105 break;
4106 }
4107 if (h->ident != sp->confid[IDX_CHAP]) {
4108 if (debug)
4109 log(LOG_DEBUG,
4110 SPP_FMT "chap dropping response for old ID "
4111 "(got %d, expected %d)\n",
4112 SPP_ARGS(ifp),
4113 h->ident, sp->confid[IDX_CHAP]);
4114 break;
4115 }
4116 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4117 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4118 log(LOG_INFO, SPP_FMT "chap response, his name ",
4119 SPP_ARGS(ifp));
4120 sppp_print_string(name, name_len);
4121 log(-1, " != expected ");
4122 sppp_print_string(sp->hisauth.name,
4123 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4124 log(-1, "\n");
4125 }
4126 if (debug) {
4127 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4128 "<%s id=0x%x len=%d name=",
4129 SPP_ARGS(ifp),
4130 sppp_state_name(sp->state[IDX_CHAP]),
4131 sppp_auth_type_name(PPP_CHAP, h->type),
4132 h->ident, ntohs (h->len));
4133 sppp_print_string((char*)name, name_len);
4134 log(-1, " value-size=%d value=", value_len);
4135 sppp_print_bytes(value, value_len);
4136 log(-1, ">\n");
4137 }
4138 if (value_len != AUTHKEYLEN) {
4139 if (debug)
4140 log(LOG_DEBUG,
4141 SPP_FMT "chap bad hash value length: "
4142 "%d bytes, should be %d\n",
4143 SPP_ARGS(ifp), value_len,
4144 AUTHKEYLEN);
4145 break;
4146 }
4147
4148 MD5Init(&ctx);
4149 MD5Update(&ctx, &h->ident, 1);
4150 MD5Update(&ctx, sp->hisauth.secret,
4151 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4152 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4153 MD5Final(digest, &ctx);
4154
4155 #define FAILMSG "Failed..."
4156 #define SUCCMSG "Welcome!"
4157
4158 if (value_len != sizeof digest ||
4159 bcmp(digest, value, value_len) != 0) {
4160 /* action scn, tld */
4161 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4162 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4163 0);
4164 chap.tld(sp);
4165 break;
4166 }
4167 /* action sca, perhaps tlu */
4168 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4169 sp->state[IDX_CHAP] == STATE_OPENED)
4170 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4171 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4172 0);
4173 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4174 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4175 chap.tlu(sp);
4176 }
4177 break;
4178
4179 default:
4180 /* Unknown CHAP packet type -- ignore. */
4181 if (debug) {
4182 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4183 "<0x%x id=0x%xh len=%d",
4184 SPP_ARGS(ifp),
4185 sppp_state_name(sp->state[IDX_CHAP]),
4186 h->type, h->ident, ntohs(h->len));
4187 sppp_print_bytes((u_char*)(h+1), len-4);
4188 log(-1, ">\n");
4189 }
4190 break;
4191
4192 }
4193 }
4194
4195 static void
sppp_chap_init(struct sppp * sp)4196 sppp_chap_init(struct sppp *sp)
4197 {
4198 /* Chap doesn't have STATE_INITIAL at all. */
4199 sp->state[IDX_CHAP] = STATE_CLOSED;
4200 sp->fail_counter[IDX_CHAP] = 0;
4201 sp->pp_seq[IDX_CHAP] = 0;
4202 sp->pp_rseq[IDX_CHAP] = 0;
4203 callout_init(&sp->ch[IDX_CHAP], 1);
4204 }
4205
4206 static void
sppp_chap_open(struct sppp * sp)4207 sppp_chap_open(struct sppp *sp)
4208 {
4209 if (sp->myauth.proto == PPP_CHAP &&
4210 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4211 /* we are authenticator for CHAP, start it */
4212 chap.scr(sp);
4213 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4214 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4215 }
4216 /* nothing to be done if we are peer, await a challenge */
4217 }
4218
4219 static void
sppp_chap_close(struct sppp * sp)4220 sppp_chap_close(struct sppp *sp)
4221 {
4222 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4223 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4224 }
4225
4226 static void
sppp_chap_TO(void * cookie)4227 sppp_chap_TO(void *cookie)
4228 {
4229 struct sppp *sp = (struct sppp *)cookie;
4230 STDDCL;
4231
4232 SPPP_LOCK(sp);
4233 if (debug)
4234 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4235 SPP_ARGS(ifp),
4236 sppp_state_name(sp->state[IDX_CHAP]),
4237 sp->rst_counter[IDX_CHAP]);
4238
4239 if (--sp->rst_counter[IDX_CHAP] < 0)
4240 /* TO- event */
4241 switch (sp->state[IDX_CHAP]) {
4242 case STATE_REQ_SENT:
4243 chap.tld(sp);
4244 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4245 break;
4246 }
4247 else
4248 /* TO+ (or TO*) event */
4249 switch (sp->state[IDX_CHAP]) {
4250 case STATE_OPENED:
4251 /* TO* event */
4252 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4253 /* FALLTHROUGH */
4254 case STATE_REQ_SENT:
4255 chap.scr(sp);
4256 /* sppp_cp_change_state() will restart the timer */
4257 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4258 break;
4259 }
4260
4261 SPPP_UNLOCK(sp);
4262 }
4263
4264 static void
sppp_chap_tlu(struct sppp * sp)4265 sppp_chap_tlu(struct sppp *sp)
4266 {
4267 STDDCL;
4268 int i;
4269
4270 i = 0;
4271 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4272
4273 /*
4274 * Some broken CHAP implementations (Conware CoNet, firmware
4275 * 4.0.?) don't want to re-authenticate their CHAP once the
4276 * initial challenge-response exchange has taken place.
4277 * Provide for an option to avoid rechallenges.
4278 */
4279 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4280 /*
4281 * Compute the re-challenge timeout. This will yield
4282 * a number between 300 and 810 seconds.
4283 */
4284 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4285 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4286 }
4287
4288 if (debug) {
4289 log(LOG_DEBUG,
4290 SPP_FMT "chap %s, ",
4291 SPP_ARGS(ifp),
4292 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4293 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4294 log(-1, "next re-challenge in %d seconds\n", i);
4295 else
4296 log(-1, "re-challenging suppressed\n");
4297 }
4298
4299 SPPP_LOCK(sp);
4300 /* indicate to LCP that we need to be closed down */
4301 sp->lcp.protos |= (1 << IDX_CHAP);
4302
4303 if (sp->pp_flags & PP_NEEDAUTH) {
4304 /*
4305 * Remote is authenticator, but his auth proto didn't
4306 * complete yet. Defer the transition to network
4307 * phase.
4308 */
4309 SPPP_UNLOCK(sp);
4310 return;
4311 }
4312 SPPP_UNLOCK(sp);
4313
4314 /*
4315 * If we are already in phase network, we are done here. This
4316 * is the case if this is a dummy tlu event after a re-challenge.
4317 */
4318 if (sp->pp_phase != PHASE_NETWORK)
4319 sppp_phase_network(sp);
4320 }
4321
4322 static void
sppp_chap_tld(struct sppp * sp)4323 sppp_chap_tld(struct sppp *sp)
4324 {
4325 STDDCL;
4326
4327 if (debug)
4328 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4329 callout_stop(&sp->ch[IDX_CHAP]);
4330 sp->lcp.protos &= ~(1 << IDX_CHAP);
4331
4332 lcp.Close(sp);
4333 }
4334
4335 static void
sppp_chap_scr(struct sppp * sp)4336 sppp_chap_scr(struct sppp *sp)
4337 {
4338 u_long *ch, seed;
4339 u_char clen;
4340
4341 /* Compute random challenge. */
4342 ch = (u_long *)sp->myauth.challenge;
4343 read_random(&seed, sizeof seed);
4344 ch[0] = seed ^ random();
4345 ch[1] = seed ^ random();
4346 ch[2] = seed ^ random();
4347 ch[3] = seed ^ random();
4348 clen = AUTHKEYLEN;
4349
4350 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4351
4352 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4353 sizeof clen, (const char *)&clen,
4354 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4355 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4356 sp->myauth.name,
4357 0);
4358 }
4359
4360 /*
4361 *--------------------------------------------------------------------------*
4362 * *
4363 * The PAP implementation. *
4364 * *
4365 *--------------------------------------------------------------------------*
4366 */
4367 /*
4368 * For PAP, we need to keep a little state also if we are the peer, not the
4369 * authenticator. This is since we don't get a request to authenticate, but
4370 * have to repeatedly authenticate ourself until we got a response (or the
4371 * retry counter is expired).
4372 */
4373
4374 /*
4375 * Handle incoming PAP packets. */
4376 static void
sppp_pap_input(struct sppp * sp,struct mbuf * m)4377 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4378 {
4379 STDDCL;
4380 struct lcp_header *h;
4381 int len;
4382 u_char *name, *passwd, mlen;
4383 int name_len, passwd_len;
4384
4385 len = m->m_pkthdr.len;
4386 if (len < 5) {
4387 if (debug)
4388 log(LOG_DEBUG,
4389 SPP_FMT "pap invalid packet length: %d bytes\n",
4390 SPP_ARGS(ifp), len);
4391 return;
4392 }
4393 h = mtod (m, struct lcp_header*);
4394 if (len > ntohs (h->len))
4395 len = ntohs (h->len);
4396 switch (h->type) {
4397 /* PAP request is my authproto */
4398 case PAP_REQ:
4399 name = 1 + (u_char*)(h+1);
4400 name_len = name[-1];
4401 passwd = name + name_len + 1;
4402 if (name_len > len - 6 ||
4403 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4404 if (debug) {
4405 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4406 "<%s id=0x%x len=%d",
4407 SPP_ARGS(ifp),
4408 sppp_auth_type_name(PPP_PAP, h->type),
4409 h->ident, ntohs(h->len));
4410 sppp_print_bytes((u_char*)(h+1), len-4);
4411 log(-1, ">\n");
4412 }
4413 break;
4414 }
4415 if (debug) {
4416 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4417 "<%s id=0x%x len=%d name=",
4418 SPP_ARGS(ifp),
4419 sppp_state_name(sp->state[IDX_PAP]),
4420 sppp_auth_type_name(PPP_PAP, h->type),
4421 h->ident, ntohs(h->len));
4422 sppp_print_string((char*)name, name_len);
4423 log(-1, " passwd=");
4424 sppp_print_string((char*)passwd, passwd_len);
4425 log(-1, ">\n");
4426 }
4427 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4428 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4429 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4430 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4431 /* action scn, tld */
4432 mlen = sizeof(FAILMSG) - 1;
4433 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4434 sizeof mlen, (const char *)&mlen,
4435 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4436 0);
4437 pap.tld(sp);
4438 break;
4439 }
4440 /* action sca, perhaps tlu */
4441 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4442 sp->state[IDX_PAP] == STATE_OPENED) {
4443 mlen = sizeof(SUCCMSG) - 1;
4444 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4445 sizeof mlen, (const char *)&mlen,
4446 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4447 0);
4448 }
4449 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4450 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4451 pap.tlu(sp);
4452 }
4453 break;
4454
4455 /* ack and nak are his authproto */
4456 case PAP_ACK:
4457 callout_stop(&sp->pap_my_to_ch);
4458 if (debug) {
4459 log(LOG_DEBUG, SPP_FMT "pap success",
4460 SPP_ARGS(ifp));
4461 name_len = *((char *)h);
4462 if (len > 5 && name_len) {
4463 log(-1, ": ");
4464 sppp_print_string((char*)(h+1), name_len);
4465 }
4466 log(-1, "\n");
4467 }
4468 SPPP_LOCK(sp);
4469 sp->pp_flags &= ~PP_NEEDAUTH;
4470 if (sp->myauth.proto == PPP_PAP &&
4471 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4472 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4473 /*
4474 * We are authenticator for PAP but didn't
4475 * complete yet. Leave it to tlu to proceed
4476 * to network phase.
4477 */
4478 SPPP_UNLOCK(sp);
4479 break;
4480 }
4481 SPPP_UNLOCK(sp);
4482 sppp_phase_network(sp);
4483 break;
4484
4485 case PAP_NAK:
4486 callout_stop (&sp->pap_my_to_ch);
4487 if (debug) {
4488 log(LOG_INFO, SPP_FMT "pap failure",
4489 SPP_ARGS(ifp));
4490 name_len = *((char *)h);
4491 if (len > 5 && name_len) {
4492 log(-1, ": ");
4493 sppp_print_string((char*)(h+1), name_len);
4494 }
4495 log(-1, "\n");
4496 } else
4497 log(LOG_INFO, SPP_FMT "pap failure\n",
4498 SPP_ARGS(ifp));
4499 /* await LCP shutdown by authenticator */
4500 break;
4501
4502 default:
4503 /* Unknown PAP packet type -- ignore. */
4504 if (debug) {
4505 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4506 "<0x%x id=0x%x len=%d",
4507 SPP_ARGS(ifp),
4508 h->type, h->ident, ntohs(h->len));
4509 sppp_print_bytes((u_char*)(h+1), len-4);
4510 log(-1, ">\n");
4511 }
4512 break;
4513
4514 }
4515 }
4516
4517 static void
sppp_pap_init(struct sppp * sp)4518 sppp_pap_init(struct sppp *sp)
4519 {
4520 /* PAP doesn't have STATE_INITIAL at all. */
4521 sp->state[IDX_PAP] = STATE_CLOSED;
4522 sp->fail_counter[IDX_PAP] = 0;
4523 sp->pp_seq[IDX_PAP] = 0;
4524 sp->pp_rseq[IDX_PAP] = 0;
4525 callout_init(&sp->ch[IDX_PAP], 1);
4526 callout_init(&sp->pap_my_to_ch, 1);
4527 }
4528
4529 static void
sppp_pap_open(struct sppp * sp)4530 sppp_pap_open(struct sppp *sp)
4531 {
4532 if (sp->hisauth.proto == PPP_PAP &&
4533 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4534 /* we are authenticator for PAP, start our timer */
4535 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4536 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4537 }
4538 if (sp->myauth.proto == PPP_PAP) {
4539 /* we are peer, send a request, and start a timer */
4540 pap.scr(sp);
4541 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4542 sppp_pap_my_TO, (void *)sp);
4543 }
4544 }
4545
4546 static void
sppp_pap_close(struct sppp * sp)4547 sppp_pap_close(struct sppp *sp)
4548 {
4549 if (sp->state[IDX_PAP] != STATE_CLOSED)
4550 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4551 }
4552
4553 /*
4554 * That's the timeout routine if we are authenticator. Since the
4555 * authenticator is basically passive in PAP, we can't do much here.
4556 */
4557 static void
sppp_pap_TO(void * cookie)4558 sppp_pap_TO(void *cookie)
4559 {
4560 struct sppp *sp = (struct sppp *)cookie;
4561 STDDCL;
4562
4563 SPPP_LOCK(sp);
4564 if (debug)
4565 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4566 SPP_ARGS(ifp),
4567 sppp_state_name(sp->state[IDX_PAP]),
4568 sp->rst_counter[IDX_PAP]);
4569
4570 if (--sp->rst_counter[IDX_PAP] < 0)
4571 /* TO- event */
4572 switch (sp->state[IDX_PAP]) {
4573 case STATE_REQ_SENT:
4574 pap.tld(sp);
4575 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4576 break;
4577 }
4578 else
4579 /* TO+ event, not very much we could do */
4580 switch (sp->state[IDX_PAP]) {
4581 case STATE_REQ_SENT:
4582 /* sppp_cp_change_state() will restart the timer */
4583 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4584 break;
4585 }
4586
4587 SPPP_UNLOCK(sp);
4588 }
4589
4590 /*
4591 * That's the timeout handler if we are peer. Since the peer is active,
4592 * we need to retransmit our PAP request since it is apparently lost.
4593 * XXX We should impose a max counter.
4594 */
4595 static void
sppp_pap_my_TO(void * cookie)4596 sppp_pap_my_TO(void *cookie)
4597 {
4598 struct sppp *sp = (struct sppp *)cookie;
4599 STDDCL;
4600
4601 if (debug)
4602 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4603 SPP_ARGS(ifp));
4604
4605 SPPP_LOCK(sp);
4606 pap.scr(sp);
4607 SPPP_UNLOCK(sp);
4608 }
4609
4610 static void
sppp_pap_tlu(struct sppp * sp)4611 sppp_pap_tlu(struct sppp *sp)
4612 {
4613 STDDCL;
4614
4615 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4616
4617 if (debug)
4618 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4619 SPP_ARGS(ifp), pap.name);
4620
4621 SPPP_LOCK(sp);
4622 /* indicate to LCP that we need to be closed down */
4623 sp->lcp.protos |= (1 << IDX_PAP);
4624
4625 if (sp->pp_flags & PP_NEEDAUTH) {
4626 /*
4627 * Remote is authenticator, but his auth proto didn't
4628 * complete yet. Defer the transition to network
4629 * phase.
4630 */
4631 SPPP_UNLOCK(sp);
4632 return;
4633 }
4634 SPPP_UNLOCK(sp);
4635 sppp_phase_network(sp);
4636 }
4637
4638 static void
sppp_pap_tld(struct sppp * sp)4639 sppp_pap_tld(struct sppp *sp)
4640 {
4641 STDDCL;
4642
4643 if (debug)
4644 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4645 callout_stop (&sp->ch[IDX_PAP]);
4646 callout_stop (&sp->pap_my_to_ch);
4647 sp->lcp.protos &= ~(1 << IDX_PAP);
4648
4649 lcp.Close(sp);
4650 }
4651
4652 static void
sppp_pap_scr(struct sppp * sp)4653 sppp_pap_scr(struct sppp *sp)
4654 {
4655 u_char idlen, pwdlen;
4656
4657 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4658 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4659 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4660
4661 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4662 sizeof idlen, (const char *)&idlen,
4663 (size_t)idlen, sp->myauth.name,
4664 sizeof pwdlen, (const char *)&pwdlen,
4665 (size_t)pwdlen, sp->myauth.secret,
4666 0);
4667 }
4668
4669 /*
4670 * Random miscellaneous functions.
4671 */
4672
4673 /*
4674 * Send a PAP or CHAP proto packet.
4675 *
4676 * Varadic function, each of the elements for the ellipsis is of type
4677 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4678 * mlen == 0.
4679 * NOTE: never declare variadic functions with types subject to type
4680 * promotion (i.e. u_char). This is asking for big trouble depending
4681 * on the architecture you are on...
4682 */
4683
4684 static void
sppp_auth_send(const struct cp * cp,struct sppp * sp,unsigned int type,unsigned int id,...)4685 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4686 unsigned int type, unsigned int id,
4687 ...)
4688 {
4689 STDDCL;
4690 struct ppp_header *h;
4691 struct lcp_header *lh;
4692 struct mbuf *m;
4693 u_char *p;
4694 int len;
4695 unsigned int mlen;
4696 const char *msg;
4697 va_list ap;
4698
4699 MGETHDR (m, M_NOWAIT, MT_DATA);
4700 if (! m)
4701 return;
4702 m->m_pkthdr.rcvif = 0;
4703
4704 h = mtod (m, struct ppp_header*);
4705 h->address = PPP_ALLSTATIONS; /* broadcast address */
4706 h->control = PPP_UI; /* Unnumbered Info */
4707 h->protocol = htons(cp->proto);
4708
4709 lh = (struct lcp_header*)(h + 1);
4710 lh->type = type;
4711 lh->ident = id;
4712 p = (u_char*) (lh+1);
4713
4714 va_start(ap, id);
4715 len = 0;
4716
4717 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4718 msg = va_arg(ap, const char *);
4719 len += mlen;
4720 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4721 va_end(ap);
4722 m_freem(m);
4723 return;
4724 }
4725
4726 bcopy(msg, p, mlen);
4727 p += mlen;
4728 }
4729 va_end(ap);
4730
4731 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4732 lh->len = htons (LCP_HEADER_LEN + len);
4733
4734 if (debug) {
4735 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4736 SPP_ARGS(ifp), cp->name,
4737 sppp_auth_type_name(cp->proto, lh->type),
4738 lh->ident, ntohs(lh->len));
4739 sppp_print_bytes((u_char*) (lh+1), len);
4740 log(-1, ">\n");
4741 }
4742 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4743 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4744 }
4745
4746 /*
4747 * Flush interface queue.
4748 */
4749 static void
sppp_qflush(struct ifqueue * ifq)4750 sppp_qflush(struct ifqueue *ifq)
4751 {
4752 struct mbuf *m, *n;
4753
4754 n = ifq->ifq_head;
4755 while ((m = n)) {
4756 n = m->m_nextpkt;
4757 m_freem (m);
4758 }
4759 ifq->ifq_head = 0;
4760 ifq->ifq_tail = 0;
4761 ifq->ifq_len = 0;
4762 }
4763
4764 /*
4765 * Send keepalive packets, every 10 seconds.
4766 */
4767 static void
sppp_keepalive(void * dummy)4768 sppp_keepalive(void *dummy)
4769 {
4770 struct sppp *sp = (struct sppp*)dummy;
4771 struct ifnet *ifp = SP2IFP(sp);
4772
4773 SPPP_LOCK(sp);
4774 /* Keepalive mode disabled or channel down? */
4775 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4776 ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4777 goto out;
4778
4779 if (sp->pp_mode == PP_FR) {
4780 sppp_fr_keepalive (sp);
4781 goto out;
4782 }
4783
4784 /* No keepalive in PPP mode if LCP not opened yet. */
4785 if (sp->pp_mode != IFF_CISCO &&
4786 sp->pp_phase < PHASE_AUTHENTICATE)
4787 goto out;
4788
4789 if (sp->pp_alivecnt == MAXALIVECNT) {
4790 /* No keepalive packets got. Stop the interface. */
4791 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4792 if_down (ifp);
4793 sppp_qflush (&sp->pp_cpq);
4794 if (sp->pp_mode != IFF_CISCO) {
4795 /* XXX */
4796 /* Shut down the PPP link. */
4797 lcp.Down(sp);
4798 /* Initiate negotiation. XXX */
4799 lcp.Up(sp);
4800 }
4801 }
4802 if (sp->pp_alivecnt <= MAXALIVECNT)
4803 ++sp->pp_alivecnt;
4804 if (sp->pp_mode == IFF_CISCO)
4805 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4806 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4807 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4808 uint32_t nmagic = htonl(sp->lcp.magic);
4809 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4810 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4811 sp->lcp.echoid, 4, &nmagic);
4812 }
4813 out:
4814 SPPP_UNLOCK(sp);
4815 callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4816 (void *)sp);
4817 }
4818
4819 /*
4820 * Get both IP addresses.
4821 */
4822 void
sppp_get_ip_addrs(struct sppp * sp,u_long * src,u_long * dst,u_long * srcmask)4823 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4824 {
4825 struct ifnet *ifp = SP2IFP(sp);
4826 struct ifaddr *ifa;
4827 struct sockaddr_in *si, *sm;
4828 u_long ssrc, ddst;
4829
4830 sm = NULL;
4831 ssrc = ddst = 0L;
4832 /*
4833 * Pick the first AF_INET address from the list,
4834 * aliases don't make any sense on a p2p link anyway.
4835 */
4836 si = NULL;
4837 if_addr_rlock(ifp);
4838 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4839 if (ifa->ifa_addr->sa_family == AF_INET) {
4840 si = (struct sockaddr_in *)ifa->ifa_addr;
4841 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4842 if (si)
4843 break;
4844 }
4845 if (ifa) {
4846 if (si && si->sin_addr.s_addr) {
4847 ssrc = si->sin_addr.s_addr;
4848 if (srcmask)
4849 *srcmask = ntohl(sm->sin_addr.s_addr);
4850 }
4851
4852 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4853 if (si && si->sin_addr.s_addr)
4854 ddst = si->sin_addr.s_addr;
4855 }
4856 if_addr_runlock(ifp);
4857
4858 if (dst) *dst = ntohl(ddst);
4859 if (src) *src = ntohl(ssrc);
4860 }
4861
4862 #ifdef INET
4863 /*
4864 * Set my IP address.
4865 */
4866 static void
sppp_set_ip_addr(struct sppp * sp,u_long src)4867 sppp_set_ip_addr(struct sppp *sp, u_long src)
4868 {
4869 STDDCL;
4870 struct ifaddr *ifa;
4871 struct sockaddr_in *si;
4872 struct in_ifaddr *ia;
4873
4874 /*
4875 * Pick the first AF_INET address from the list,
4876 * aliases don't make any sense on a p2p link anyway.
4877 */
4878 si = NULL;
4879 if_addr_rlock(ifp);
4880 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4881 if (ifa->ifa_addr->sa_family == AF_INET) {
4882 si = (struct sockaddr_in *)ifa->ifa_addr;
4883 if (si != NULL) {
4884 ifa_ref(ifa);
4885 break;
4886 }
4887 }
4888 }
4889 if_addr_runlock(ifp);
4890
4891 if (ifa != NULL) {
4892 int error;
4893
4894 /* delete old route */
4895 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4896 if (debug && error) {
4897 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4898 SPP_ARGS(ifp), error);
4899 }
4900
4901 /* set new address */
4902 si->sin_addr.s_addr = htonl(src);
4903 ia = ifatoia(ifa);
4904 IN_IFADDR_WLOCK();
4905 LIST_REMOVE(ia, ia_hash);
4906 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4907 IN_IFADDR_WUNLOCK();
4908
4909 /* add new route */
4910 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4911 if (debug && error) {
4912 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4913 SPP_ARGS(ifp), error);
4914 }
4915 ifa_free(ifa);
4916 }
4917 }
4918 #endif
4919
4920 #ifdef INET6
4921 /*
4922 * Get both IPv6 addresses.
4923 */
4924 static void
sppp_get_ip6_addrs(struct sppp * sp,struct in6_addr * src,struct in6_addr * dst,struct in6_addr * srcmask)4925 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4926 struct in6_addr *srcmask)
4927 {
4928 struct ifnet *ifp = SP2IFP(sp);
4929 struct ifaddr *ifa;
4930 struct sockaddr_in6 *si, *sm;
4931 struct in6_addr ssrc, ddst;
4932
4933 sm = NULL;
4934 bzero(&ssrc, sizeof(ssrc));
4935 bzero(&ddst, sizeof(ddst));
4936 /*
4937 * Pick the first link-local AF_INET6 address from the list,
4938 * aliases don't make any sense on a p2p link anyway.
4939 */
4940 si = NULL;
4941 if_addr_rlock(ifp);
4942 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4943 if (ifa->ifa_addr->sa_family == AF_INET6) {
4944 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4945 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4946 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4947 break;
4948 }
4949 if (ifa) {
4950 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4951 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4952 if (srcmask) {
4953 bcopy(&sm->sin6_addr, srcmask,
4954 sizeof(*srcmask));
4955 }
4956 }
4957
4958 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4959 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4960 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4961 }
4962
4963 if (dst)
4964 bcopy(&ddst, dst, sizeof(*dst));
4965 if (src)
4966 bcopy(&ssrc, src, sizeof(*src));
4967 if_addr_runlock(ifp);
4968 }
4969
4970 #ifdef IPV6CP_MYIFID_DYN
4971 /*
4972 * Generate random ifid.
4973 */
4974 static void
sppp_gen_ip6_addr(struct sppp * sp,struct in6_addr * addr)4975 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4976 {
4977 /* TBD */
4978 }
4979
4980 /*
4981 * Set my IPv6 address.
4982 */
4983 static void
sppp_set_ip6_addr(struct sppp * sp,const struct in6_addr * src)4984 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4985 {
4986 STDDCL;
4987 struct ifaddr *ifa;
4988 struct sockaddr_in6 *sin6;
4989
4990 /*
4991 * Pick the first link-local AF_INET6 address from the list,
4992 * aliases don't make any sense on a p2p link anyway.
4993 */
4994
4995 sin6 = NULL;
4996 if_addr_rlock(ifp);
4997 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4998 if (ifa->ifa_addr->sa_family == AF_INET6) {
4999 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5000 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5001 ifa_ref(ifa);
5002 break;
5003 }
5004 }
5005 }
5006 if_addr_runlock(ifp);
5007
5008 if (ifa != NULL) {
5009 int error;
5010 struct sockaddr_in6 new_sin6 = *sin6;
5011
5012 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5013 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5014 if (debug && error) {
5015 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5016 " failed, error=%d\n", SPP_ARGS(ifp), error);
5017 }
5018 ifa_free(ifa);
5019 }
5020 }
5021 #endif
5022
5023 /*
5024 * Suggest a candidate address to be used by peer.
5025 */
5026 static void
sppp_suggest_ip6_addr(struct sppp * sp,struct in6_addr * suggest)5027 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5028 {
5029 struct in6_addr myaddr;
5030 struct timeval tv;
5031
5032 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5033
5034 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
5035 microtime(&tv);
5036 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5037 myaddr.s6_addr[14] ^= 0xff;
5038 myaddr.s6_addr[15] ^= 0xff;
5039 } else {
5040 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5041 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5042 }
5043 if (suggest)
5044 bcopy(&myaddr, suggest, sizeof(myaddr));
5045 }
5046 #endif /*INET6*/
5047
5048 static int
sppp_params(struct sppp * sp,u_long cmd,void * data)5049 sppp_params(struct sppp *sp, u_long cmd, void *data)
5050 {
5051 u_long subcmd;
5052 struct ifreq *ifr = (struct ifreq *)data;
5053 struct spppreq *spr;
5054 int rv = 0;
5055
5056 if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == NULL)
5057 return (EAGAIN);
5058 /*
5059 * ifr_data_get_ptr(ifr) is supposed to point to a struct spppreq.
5060 * Check the cmd word first before attempting to fetch all the
5061 * data.
5062 */
5063 rv = fueword(ifr_data_get_ptr(ifr), &subcmd);
5064 if (rv == -1) {
5065 rv = EFAULT;
5066 goto quit;
5067 }
5068
5069 if (copyin(ifr_data_get_ptr(ifr), spr, sizeof(struct spppreq)) != 0) {
5070 rv = EFAULT;
5071 goto quit;
5072 }
5073
5074 switch (subcmd) {
5075 case (u_long)SPPPIOGDEFS:
5076 if (cmd != SIOCGIFGENERIC) {
5077 rv = EINVAL;
5078 break;
5079 }
5080 /*
5081 * We copy over the entire current state, but clean
5082 * out some of the stuff we don't wanna pass up.
5083 * Remember, SIOCGIFGENERIC is unprotected, and can be
5084 * called by any user. No need to ever get PAP or
5085 * CHAP secrets back to userland anyway.
5086 */
5087 spr->defs.pp_phase = sp->pp_phase;
5088 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5089 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5090 spr->defs.lcp = sp->lcp;
5091 spr->defs.ipcp = sp->ipcp;
5092 spr->defs.ipv6cp = sp->ipv6cp;
5093 spr->defs.myauth = sp->myauth;
5094 spr->defs.hisauth = sp->hisauth;
5095 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5096 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5097 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5098 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5099 /*
5100 * Fixup the LCP timeout value to milliseconds so
5101 * spppcontrol doesn't need to bother about the value
5102 * of "hz". We do the reverse calculation below when
5103 * setting it.
5104 */
5105 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5106 rv = copyout(spr, ifr_data_get_ptr(ifr),
5107 sizeof(struct spppreq));
5108 break;
5109
5110 case (u_long)SPPPIOSDEFS:
5111 if (cmd != SIOCSIFGENERIC) {
5112 rv = EINVAL;
5113 break;
5114 }
5115 /*
5116 * We have a very specific idea of which fields we
5117 * allow being passed back from userland, so to not
5118 * clobber our current state. For one, we only allow
5119 * setting anything if LCP is in dead or establish
5120 * phase. Once the authentication negotiations
5121 * started, the authentication settings must not be
5122 * changed again. (The administrator can force an
5123 * ifconfig down in order to get LCP back into dead
5124 * phase.)
5125 *
5126 * Also, we only allow for authentication parameters to be
5127 * specified.
5128 *
5129 * XXX Should allow to set or clear pp_flags.
5130 *
5131 * Finally, if the respective authentication protocol to
5132 * be used is set differently than 0, but the secret is
5133 * passed as all zeros, we don't trash the existing secret.
5134 * This allows an administrator to change the system name
5135 * only without clobbering the secret (which he didn't get
5136 * back in a previous SPPPIOGDEFS call). However, the
5137 * secrets are cleared if the authentication protocol is
5138 * reset to 0. */
5139 if (sp->pp_phase != PHASE_DEAD &&
5140 sp->pp_phase != PHASE_ESTABLISH) {
5141 rv = EBUSY;
5142 break;
5143 }
5144
5145 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5146 spr->defs.myauth.proto != PPP_CHAP) ||
5147 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5148 spr->defs.hisauth.proto != PPP_CHAP)) {
5149 rv = EINVAL;
5150 break;
5151 }
5152
5153 if (spr->defs.myauth.proto == 0)
5154 /* resetting myauth */
5155 bzero(&sp->myauth, sizeof sp->myauth);
5156 else {
5157 /* setting/changing myauth */
5158 sp->myauth.proto = spr->defs.myauth.proto;
5159 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5160 if (spr->defs.myauth.secret[0] != '\0')
5161 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5162 AUTHKEYLEN);
5163 }
5164 if (spr->defs.hisauth.proto == 0)
5165 /* resetting hisauth */
5166 bzero(&sp->hisauth, sizeof sp->hisauth);
5167 else {
5168 /* setting/changing hisauth */
5169 sp->hisauth.proto = spr->defs.hisauth.proto;
5170 sp->hisauth.flags = spr->defs.hisauth.flags;
5171 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5172 if (spr->defs.hisauth.secret[0] != '\0')
5173 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5174 AUTHKEYLEN);
5175 }
5176 /* set LCP restart timer timeout */
5177 if (spr->defs.lcp.timeout != 0)
5178 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5179 /* set VJ enable and IPv6 disable flags */
5180 #ifdef INET
5181 if (spr->defs.enable_vj)
5182 sp->confflags |= CONF_ENABLE_VJ;
5183 else
5184 sp->confflags &= ~CONF_ENABLE_VJ;
5185 #endif
5186 #ifdef INET6
5187 if (spr->defs.enable_ipv6)
5188 sp->confflags |= CONF_ENABLE_IPV6;
5189 else
5190 sp->confflags &= ~CONF_ENABLE_IPV6;
5191 #endif
5192 break;
5193
5194 default:
5195 rv = EINVAL;
5196 }
5197
5198 quit:
5199 free(spr, M_TEMP);
5200
5201 return (rv);
5202 }
5203
5204 static void
sppp_phase_network(struct sppp * sp)5205 sppp_phase_network(struct sppp *sp)
5206 {
5207 STDDCL;
5208 int i;
5209 u_long mask;
5210
5211 sp->pp_phase = PHASE_NETWORK;
5212
5213 if (debug)
5214 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5215 sppp_phase_name(sp->pp_phase));
5216
5217 /* Notify NCPs now. */
5218 for (i = 0; i < IDX_COUNT; i++)
5219 if ((cps[i])->flags & CP_NCP)
5220 (cps[i])->Open(sp);
5221
5222 /* Send Up events to all NCPs. */
5223 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5224 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5225 (cps[i])->Up(sp);
5226
5227 /* if no NCP is starting, all this was in vain, close down */
5228 sppp_lcp_check_and_close(sp);
5229 }
5230
5231
5232 static const char *
sppp_cp_type_name(u_char type)5233 sppp_cp_type_name(u_char type)
5234 {
5235 static char buf[12];
5236 switch (type) {
5237 case CONF_REQ: return "conf-req";
5238 case CONF_ACK: return "conf-ack";
5239 case CONF_NAK: return "conf-nak";
5240 case CONF_REJ: return "conf-rej";
5241 case TERM_REQ: return "term-req";
5242 case TERM_ACK: return "term-ack";
5243 case CODE_REJ: return "code-rej";
5244 case PROTO_REJ: return "proto-rej";
5245 case ECHO_REQ: return "echo-req";
5246 case ECHO_REPLY: return "echo-reply";
5247 case DISC_REQ: return "discard-req";
5248 }
5249 snprintf (buf, sizeof(buf), "cp/0x%x", type);
5250 return buf;
5251 }
5252
5253 static const char *
sppp_auth_type_name(u_short proto,u_char type)5254 sppp_auth_type_name(u_short proto, u_char type)
5255 {
5256 static char buf[12];
5257 switch (proto) {
5258 case PPP_CHAP:
5259 switch (type) {
5260 case CHAP_CHALLENGE: return "challenge";
5261 case CHAP_RESPONSE: return "response";
5262 case CHAP_SUCCESS: return "success";
5263 case CHAP_FAILURE: return "failure";
5264 }
5265 case PPP_PAP:
5266 switch (type) {
5267 case PAP_REQ: return "req";
5268 case PAP_ACK: return "ack";
5269 case PAP_NAK: return "nak";
5270 }
5271 }
5272 snprintf (buf, sizeof(buf), "auth/0x%x", type);
5273 return buf;
5274 }
5275
5276 static const char *
sppp_lcp_opt_name(u_char opt)5277 sppp_lcp_opt_name(u_char opt)
5278 {
5279 static char buf[12];
5280 switch (opt) {
5281 case LCP_OPT_MRU: return "mru";
5282 case LCP_OPT_ASYNC_MAP: return "async-map";
5283 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5284 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5285 case LCP_OPT_MAGIC: return "magic";
5286 case LCP_OPT_PROTO_COMP: return "proto-comp";
5287 case LCP_OPT_ADDR_COMP: return "addr-comp";
5288 }
5289 snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5290 return buf;
5291 }
5292
5293 #ifdef INET
5294 static const char *
sppp_ipcp_opt_name(u_char opt)5295 sppp_ipcp_opt_name(u_char opt)
5296 {
5297 static char buf[12];
5298 switch (opt) {
5299 case IPCP_OPT_ADDRESSES: return "addresses";
5300 case IPCP_OPT_COMPRESSION: return "compression";
5301 case IPCP_OPT_ADDRESS: return "address";
5302 }
5303 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5304 return buf;
5305 }
5306 #endif
5307
5308 #ifdef INET6
5309 static const char *
sppp_ipv6cp_opt_name(u_char opt)5310 sppp_ipv6cp_opt_name(u_char opt)
5311 {
5312 static char buf[12];
5313 switch (opt) {
5314 case IPV6CP_OPT_IFID: return "ifid";
5315 case IPV6CP_OPT_COMPRESSION: return "compression";
5316 }
5317 sprintf (buf, "0x%x", opt);
5318 return buf;
5319 }
5320 #endif
5321
5322 static const char *
sppp_state_name(int state)5323 sppp_state_name(int state)
5324 {
5325 switch (state) {
5326 case STATE_INITIAL: return "initial";
5327 case STATE_STARTING: return "starting";
5328 case STATE_CLOSED: return "closed";
5329 case STATE_STOPPED: return "stopped";
5330 case STATE_CLOSING: return "closing";
5331 case STATE_STOPPING: return "stopping";
5332 case STATE_REQ_SENT: return "req-sent";
5333 case STATE_ACK_RCVD: return "ack-rcvd";
5334 case STATE_ACK_SENT: return "ack-sent";
5335 case STATE_OPENED: return "opened";
5336 }
5337 return "illegal";
5338 }
5339
5340 static const char *
sppp_phase_name(enum ppp_phase phase)5341 sppp_phase_name(enum ppp_phase phase)
5342 {
5343 switch (phase) {
5344 case PHASE_DEAD: return "dead";
5345 case PHASE_ESTABLISH: return "establish";
5346 case PHASE_TERMINATE: return "terminate";
5347 case PHASE_AUTHENTICATE: return "authenticate";
5348 case PHASE_NETWORK: return "network";
5349 }
5350 return "illegal";
5351 }
5352
5353 static const char *
sppp_proto_name(u_short proto)5354 sppp_proto_name(u_short proto)
5355 {
5356 static char buf[12];
5357 switch (proto) {
5358 case PPP_LCP: return "lcp";
5359 case PPP_IPCP: return "ipcp";
5360 case PPP_PAP: return "pap";
5361 case PPP_CHAP: return "chap";
5362 case PPP_IPV6CP: return "ipv6cp";
5363 }
5364 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5365 return buf;
5366 }
5367
5368 static void
sppp_print_bytes(const u_char * p,u_short len)5369 sppp_print_bytes(const u_char *p, u_short len)
5370 {
5371 if (len)
5372 log(-1, " %*D", len, p, "-");
5373 }
5374
5375 static void
sppp_print_string(const char * p,u_short len)5376 sppp_print_string(const char *p, u_short len)
5377 {
5378 u_char c;
5379
5380 while (len-- > 0) {
5381 c = *p++;
5382 /*
5383 * Print only ASCII chars directly. RFC 1994 recommends
5384 * using only them, but we don't rely on it. */
5385 if (c < ' ' || c > '~')
5386 log(-1, "\\x%x", c);
5387 else
5388 log(-1, "%c", c);
5389 }
5390 }
5391
5392 #ifdef INET
5393 static const char *
sppp_dotted_quad(u_long addr)5394 sppp_dotted_quad(u_long addr)
5395 {
5396 static char s[16];
5397 sprintf(s, "%d.%d.%d.%d",
5398 (int)((addr >> 24) & 0xff),
5399 (int)((addr >> 16) & 0xff),
5400 (int)((addr >> 8) & 0xff),
5401 (int)(addr & 0xff));
5402 return s;
5403 }
5404 #endif
5405
5406 static int
sppp_strnlen(u_char * p,int max)5407 sppp_strnlen(u_char *p, int max)
5408 {
5409 int len;
5410
5411 for (len = 0; len < max && *p; ++p)
5412 ++len;
5413 return len;
5414 }
5415
5416 /* a dummy, used to drop uninteresting events */
5417 static void
sppp_null(struct sppp * unused)5418 sppp_null(struct sppp *unused)
5419 {
5420 /* do just nothing */
5421 }
5422