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 if (!callout_drain(&sp->keepalive_callout))
1064 callout_stop(&sp->keepalive_callout);
1065
1066 for (i = 0; i < IDX_COUNT; i++) {
1067 if (!callout_drain(&sp->ch[i]))
1068 callout_stop(&sp->ch[i]);
1069 }
1070 if (!callout_drain(&sp->pap_my_to_ch))
1071 callout_stop(&sp->pap_my_to_ch);
1072 mtx_destroy(&sp->pp_cpq.ifq_mtx);
1073 mtx_destroy(&sp->pp_fastq.ifq_mtx);
1074 mtx_destroy(&sp->mtx);
1075 }
1076
1077 /*
1078 * Flush the interface output queue.
1079 */
1080 static void
sppp_flush_unlocked(struct ifnet * ifp)1081 sppp_flush_unlocked(struct ifnet *ifp)
1082 {
1083 struct sppp *sp = IFP2SP(ifp);
1084
1085 sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1086 sppp_qflush (&sp->pp_fastq);
1087 sppp_qflush (&sp->pp_cpq);
1088 }
1089
1090 void
sppp_flush(struct ifnet * ifp)1091 sppp_flush(struct ifnet *ifp)
1092 {
1093 struct sppp *sp = IFP2SP(ifp);
1094
1095 SPPP_LOCK(sp);
1096 sppp_flush_unlocked (ifp);
1097 SPPP_UNLOCK(sp);
1098 }
1099
1100 /*
1101 * Check if the output queue is empty.
1102 */
1103 int
sppp_isempty(struct ifnet * ifp)1104 sppp_isempty(struct ifnet *ifp)
1105 {
1106 struct sppp *sp = IFP2SP(ifp);
1107 int empty;
1108
1109 SPPP_LOCK(sp);
1110 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1111 !SP2IFP(sp)->if_snd.ifq_head;
1112 SPPP_UNLOCK(sp);
1113 return (empty);
1114 }
1115
1116 /*
1117 * Get next packet to send.
1118 */
1119 struct mbuf *
sppp_dequeue(struct ifnet * ifp)1120 sppp_dequeue(struct ifnet *ifp)
1121 {
1122 struct sppp *sp = IFP2SP(ifp);
1123 struct mbuf *m;
1124
1125 SPPP_LOCK(sp);
1126 /*
1127 * Process only the control protocol queue until we have at
1128 * least one NCP open.
1129 *
1130 * Do always serve all three queues in Cisco mode.
1131 */
1132 IF_DEQUEUE(&sp->pp_cpq, m);
1133 if (m == NULL &&
1134 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1135 sp->pp_mode == PP_FR)) {
1136 IF_DEQUEUE(&sp->pp_fastq, m);
1137 if (m == NULL)
1138 IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1139 }
1140 SPPP_UNLOCK(sp);
1141 return m;
1142 }
1143
1144 /*
1145 * Pick the next packet, do not remove it from the queue.
1146 */
1147 struct mbuf *
sppp_pick(struct ifnet * ifp)1148 sppp_pick(struct ifnet *ifp)
1149 {
1150 struct sppp *sp = IFP2SP(ifp);
1151 struct mbuf *m;
1152
1153 SPPP_LOCK(sp);
1154
1155 m = sp->pp_cpq.ifq_head;
1156 if (m == NULL &&
1157 (sp->pp_phase == PHASE_NETWORK ||
1158 sp->pp_mode == IFF_CISCO ||
1159 sp->pp_mode == PP_FR))
1160 if ((m = sp->pp_fastq.ifq_head) == NULL)
1161 m = SP2IFP(sp)->if_snd.ifq_head;
1162 SPPP_UNLOCK(sp);
1163 return (m);
1164 }
1165
1166 /*
1167 * Process an ioctl request. Called on low priority level.
1168 */
1169 int
sppp_ioctl(struct ifnet * ifp,IOCTL_CMD_T cmd,void * data)1170 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1171 {
1172 struct ifreq *ifr = (struct ifreq*) data;
1173 struct sppp *sp = IFP2SP(ifp);
1174 int rv, going_up, going_down, newmode;
1175
1176 SPPP_LOCK(sp);
1177 rv = 0;
1178 switch (cmd) {
1179 case SIOCAIFADDR:
1180 break;
1181
1182 case SIOCSIFADDR:
1183 /* set the interface "up" when assigning an IP address */
1184 ifp->if_flags |= IFF_UP;
1185 /* FALLTHROUGH */
1186
1187 case SIOCSIFFLAGS:
1188 going_up = ifp->if_flags & IFF_UP &&
1189 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1190 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1191 ifp->if_drv_flags & IFF_DRV_RUNNING;
1192
1193 newmode = ifp->if_flags & IFF_PASSIVE;
1194 if (!newmode)
1195 newmode = ifp->if_flags & IFF_AUTO;
1196 if (!newmode)
1197 newmode = ifp->if_flags & IFF_CISCO;
1198 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1199 ifp->if_flags |= newmode;
1200
1201 if (!newmode)
1202 newmode = sp->pp_flags & PP_FR;
1203
1204 if (newmode != sp->pp_mode) {
1205 going_down = 1;
1206 if (!going_up)
1207 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1208 }
1209
1210 if (going_down) {
1211 if (sp->pp_mode != IFF_CISCO &&
1212 sp->pp_mode != PP_FR)
1213 lcp.Close(sp);
1214 else if (sp->pp_tlf)
1215 (sp->pp_tlf)(sp);
1216 sppp_flush_unlocked(ifp);
1217 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1218 sp->pp_mode = newmode;
1219 }
1220
1221 if (going_up) {
1222 if (sp->pp_mode != IFF_CISCO &&
1223 sp->pp_mode != PP_FR)
1224 lcp.Close(sp);
1225 sp->pp_mode = newmode;
1226 if (sp->pp_mode == 0) {
1227 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1228 lcp.Open(sp);
1229 }
1230 if ((sp->pp_mode == IFF_CISCO) ||
1231 (sp->pp_mode == PP_FR)) {
1232 if (sp->pp_tls)
1233 (sp->pp_tls)(sp);
1234 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1235 }
1236 }
1237
1238 break;
1239
1240 #ifdef SIOCSIFMTU
1241 #ifndef ifr_mtu
1242 #define ifr_mtu ifr_metric
1243 #endif
1244 case SIOCSIFMTU:
1245 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1246 return (EINVAL);
1247 ifp->if_mtu = ifr->ifr_mtu;
1248 break;
1249 #endif
1250 #ifdef SLIOCSETMTU
1251 case SLIOCSETMTU:
1252 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1253 return (EINVAL);
1254 ifp->if_mtu = *(short*)data;
1255 break;
1256 #endif
1257 #ifdef SIOCGIFMTU
1258 case SIOCGIFMTU:
1259 ifr->ifr_mtu = ifp->if_mtu;
1260 break;
1261 #endif
1262 #ifdef SLIOCGETMTU
1263 case SLIOCGETMTU:
1264 *(short*)data = ifp->if_mtu;
1265 break;
1266 #endif
1267 case SIOCADDMULTI:
1268 case SIOCDELMULTI:
1269 break;
1270
1271 case SIOCGIFGENERIC:
1272 case SIOCSIFGENERIC:
1273 rv = sppp_params(sp, cmd, data);
1274 break;
1275
1276 default:
1277 rv = ENOTTY;
1278 }
1279 SPPP_UNLOCK(sp);
1280 return rv;
1281 }
1282
1283 /*
1284 * Cisco framing implementation.
1285 */
1286
1287 /*
1288 * Handle incoming Cisco keepalive protocol packets.
1289 */
1290 static void
sppp_cisco_input(struct sppp * sp,struct mbuf * m)1291 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1292 {
1293 STDDCL;
1294 struct cisco_packet *h;
1295 u_long me, mymask;
1296
1297 if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1298 if (debug)
1299 log(LOG_DEBUG,
1300 SPP_FMT "cisco invalid packet length: %d bytes\n",
1301 SPP_ARGS(ifp), m->m_pkthdr.len);
1302 return;
1303 }
1304 h = mtod (m, struct cisco_packet*);
1305 if (debug)
1306 log(LOG_DEBUG,
1307 SPP_FMT "cisco input: %d bytes "
1308 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1309 SPP_ARGS(ifp), m->m_pkthdr.len,
1310 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1311 (u_int)h->time0, (u_int)h->time1);
1312 switch (ntohl (h->type)) {
1313 default:
1314 if (debug)
1315 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1316 SPP_ARGS(ifp), (u_long)ntohl (h->type));
1317 break;
1318 case CISCO_ADDR_REPLY:
1319 /* Reply on address request, ignore */
1320 break;
1321 case CISCO_KEEPALIVE_REQ:
1322 sp->pp_alivecnt = 0;
1323 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1324 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1325 /* Local and remote sequence numbers are equal.
1326 * Probably, the line is in loopback mode. */
1327 if (sp->pp_loopcnt >= MAXALIVECNT) {
1328 printf (SPP_FMT "loopback\n",
1329 SPP_ARGS(ifp));
1330 sp->pp_loopcnt = 0;
1331 if (ifp->if_flags & IFF_UP) {
1332 if_down (ifp);
1333 sppp_qflush (&sp->pp_cpq);
1334 }
1335 }
1336 ++sp->pp_loopcnt;
1337
1338 /* Generate new local sequence number */
1339 sp->pp_seq[IDX_LCP] = random();
1340 break;
1341 }
1342 sp->pp_loopcnt = 0;
1343 if (! (ifp->if_flags & IFF_UP) &&
1344 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1345 if_up(ifp);
1346 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1347 }
1348 break;
1349 case CISCO_ADDR_REQ:
1350 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1351 if (me != 0L)
1352 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1353 break;
1354 }
1355 }
1356
1357 /*
1358 * Send Cisco keepalive packet.
1359 */
1360 static void
sppp_cisco_send(struct sppp * sp,int type,long par1,long par2)1361 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1362 {
1363 STDDCL;
1364 struct ppp_header *h;
1365 struct cisco_packet *ch;
1366 struct mbuf *m;
1367 struct timeval tv;
1368
1369 getmicrouptime(&tv);
1370
1371 MGETHDR (m, M_NOWAIT, MT_DATA);
1372 if (! m)
1373 return;
1374 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1375 m->m_pkthdr.rcvif = 0;
1376
1377 h = mtod (m, struct ppp_header*);
1378 h->address = CISCO_MULTICAST;
1379 h->control = 0;
1380 h->protocol = htons (CISCO_KEEPALIVE);
1381
1382 ch = (struct cisco_packet*) (h + 1);
1383 ch->type = htonl (type);
1384 ch->par1 = htonl (par1);
1385 ch->par2 = htonl (par2);
1386 ch->rel = -1;
1387
1388 ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1389 ch->time1 = htons ((u_short) tv.tv_sec);
1390
1391 if (debug)
1392 log(LOG_DEBUG,
1393 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1394 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1395 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1396
1397 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1398 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1399 }
1400
1401 /*
1402 * PPP protocol implementation.
1403 */
1404
1405 /*
1406 * Send PPP control protocol packet.
1407 */
1408 static void
sppp_cp_send(struct sppp * sp,u_short proto,u_char type,u_char ident,u_short len,void * data)1409 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1410 u_char ident, u_short len, void *data)
1411 {
1412 STDDCL;
1413 struct ppp_header *h;
1414 struct lcp_header *lh;
1415 struct mbuf *m;
1416
1417 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1418 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1419 MGETHDR (m, M_NOWAIT, MT_DATA);
1420 if (! m)
1421 return;
1422 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1423 m->m_pkthdr.rcvif = 0;
1424
1425 h = mtod (m, struct ppp_header*);
1426 h->address = PPP_ALLSTATIONS; /* broadcast address */
1427 h->control = PPP_UI; /* Unnumbered Info */
1428 h->protocol = htons (proto); /* Link Control Protocol */
1429
1430 lh = (struct lcp_header*) (h + 1);
1431 lh->type = type;
1432 lh->ident = ident;
1433 lh->len = htons (LCP_HEADER_LEN + len);
1434 if (len)
1435 bcopy (data, lh+1, len);
1436
1437 if (debug) {
1438 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1439 SPP_ARGS(ifp),
1440 sppp_proto_name(proto),
1441 sppp_cp_type_name (lh->type), lh->ident,
1442 ntohs (lh->len));
1443 sppp_print_bytes ((u_char*) (lh+1), len);
1444 log(-1, ">\n");
1445 }
1446 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1447 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1448 }
1449
1450 /*
1451 * Handle incoming PPP control protocol packets.
1452 */
1453 static void
sppp_cp_input(const struct cp * cp,struct sppp * sp,struct mbuf * m)1454 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1455 {
1456 STDDCL;
1457 struct lcp_header *h;
1458 int len = m->m_pkthdr.len;
1459 int rv;
1460 u_char *p;
1461
1462 if (len < 4) {
1463 if (debug)
1464 log(LOG_DEBUG,
1465 SPP_FMT "%s invalid packet length: %d bytes\n",
1466 SPP_ARGS(ifp), cp->name, len);
1467 return;
1468 }
1469 h = mtod (m, struct lcp_header*);
1470 if (debug) {
1471 log(LOG_DEBUG,
1472 SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1473 SPP_ARGS(ifp), cp->name,
1474 sppp_state_name(sp->state[cp->protoidx]),
1475 sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1476 sppp_print_bytes ((u_char*) (h+1), len-4);
1477 log(-1, ">\n");
1478 }
1479 if (len > ntohs (h->len))
1480 len = ntohs (h->len);
1481 p = (u_char *)(h + 1);
1482 switch (h->type) {
1483 case CONF_REQ:
1484 if (len < 4) {
1485 if (debug)
1486 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1487 SPP_ARGS(ifp), cp->name,
1488 len);
1489 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1490 break;
1491 }
1492 /* handle states where RCR doesn't get a SCA/SCN */
1493 switch (sp->state[cp->protoidx]) {
1494 case STATE_CLOSING:
1495 case STATE_STOPPING:
1496 return;
1497 case STATE_CLOSED:
1498 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1499 0, 0);
1500 return;
1501 }
1502 rv = (cp->RCR)(sp, h, len);
1503 switch (sp->state[cp->protoidx]) {
1504 case STATE_OPENED:
1505 (cp->tld)(sp);
1506 (cp->scr)(sp);
1507 /* FALLTHROUGH */
1508 case STATE_ACK_SENT:
1509 case STATE_REQ_SENT:
1510 /*
1511 * sppp_cp_change_state() have the side effect of
1512 * restarting the timeouts. We want to avoid that
1513 * if the state don't change, otherwise we won't
1514 * ever timeout and resend a configuration request
1515 * that got lost.
1516 */
1517 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1518 STATE_REQ_SENT))
1519 break;
1520 sppp_cp_change_state(cp, sp, rv?
1521 STATE_ACK_SENT: STATE_REQ_SENT);
1522 break;
1523 case STATE_STOPPED:
1524 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1525 (cp->scr)(sp);
1526 sppp_cp_change_state(cp, sp, rv?
1527 STATE_ACK_SENT: STATE_REQ_SENT);
1528 break;
1529 case STATE_ACK_RCVD:
1530 if (rv) {
1531 sppp_cp_change_state(cp, sp, STATE_OPENED);
1532 if (debug)
1533 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1534 SPP_ARGS(ifp),
1535 cp->name);
1536 (cp->tlu)(sp);
1537 } else
1538 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1539 break;
1540 default:
1541 printf(SPP_FMT "%s illegal %s in state %s\n",
1542 SPP_ARGS(ifp), cp->name,
1543 sppp_cp_type_name(h->type),
1544 sppp_state_name(sp->state[cp->protoidx]));
1545 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1546 }
1547 break;
1548 case CONF_ACK:
1549 if (h->ident != sp->confid[cp->protoidx]) {
1550 if (debug)
1551 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1552 SPP_ARGS(ifp), cp->name,
1553 h->ident, sp->confid[cp->protoidx]);
1554 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1555 break;
1556 }
1557 switch (sp->state[cp->protoidx]) {
1558 case STATE_CLOSED:
1559 case STATE_STOPPED:
1560 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1561 break;
1562 case STATE_CLOSING:
1563 case STATE_STOPPING:
1564 break;
1565 case STATE_REQ_SENT:
1566 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1567 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1568 break;
1569 case STATE_OPENED:
1570 (cp->tld)(sp);
1571 /* FALLTHROUGH */
1572 case STATE_ACK_RCVD:
1573 (cp->scr)(sp);
1574 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1575 break;
1576 case STATE_ACK_SENT:
1577 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1578 sppp_cp_change_state(cp, sp, STATE_OPENED);
1579 if (debug)
1580 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1581 SPP_ARGS(ifp), cp->name);
1582 (cp->tlu)(sp);
1583 break;
1584 default:
1585 printf(SPP_FMT "%s illegal %s in state %s\n",
1586 SPP_ARGS(ifp), cp->name,
1587 sppp_cp_type_name(h->type),
1588 sppp_state_name(sp->state[cp->protoidx]));
1589 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1590 }
1591 break;
1592 case CONF_NAK:
1593 case CONF_REJ:
1594 if (h->ident != sp->confid[cp->protoidx]) {
1595 if (debug)
1596 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1597 SPP_ARGS(ifp), cp->name,
1598 h->ident, sp->confid[cp->protoidx]);
1599 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1600 break;
1601 }
1602 if (h->type == CONF_NAK)
1603 (cp->RCN_nak)(sp, h, len);
1604 else /* CONF_REJ */
1605 (cp->RCN_rej)(sp, h, len);
1606
1607 switch (sp->state[cp->protoidx]) {
1608 case STATE_CLOSED:
1609 case STATE_STOPPED:
1610 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1611 break;
1612 case STATE_REQ_SENT:
1613 case STATE_ACK_SENT:
1614 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1615 /*
1616 * Slow things down a bit if we think we might be
1617 * in loopback. Depend on the timeout to send the
1618 * next configuration request.
1619 */
1620 if (sp->pp_loopcnt)
1621 break;
1622 (cp->scr)(sp);
1623 break;
1624 case STATE_OPENED:
1625 (cp->tld)(sp);
1626 /* FALLTHROUGH */
1627 case STATE_ACK_RCVD:
1628 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1629 (cp->scr)(sp);
1630 break;
1631 case STATE_CLOSING:
1632 case STATE_STOPPING:
1633 break;
1634 default:
1635 printf(SPP_FMT "%s illegal %s in state %s\n",
1636 SPP_ARGS(ifp), cp->name,
1637 sppp_cp_type_name(h->type),
1638 sppp_state_name(sp->state[cp->protoidx]));
1639 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1640 }
1641 break;
1642
1643 case TERM_REQ:
1644 switch (sp->state[cp->protoidx]) {
1645 case STATE_ACK_RCVD:
1646 case STATE_ACK_SENT:
1647 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1648 /* FALLTHROUGH */
1649 case STATE_CLOSED:
1650 case STATE_STOPPED:
1651 case STATE_CLOSING:
1652 case STATE_STOPPING:
1653 case STATE_REQ_SENT:
1654 sta:
1655 /* Send Terminate-Ack packet. */
1656 if (debug)
1657 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1658 SPP_ARGS(ifp), cp->name);
1659 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1660 break;
1661 case STATE_OPENED:
1662 (cp->tld)(sp);
1663 sp->rst_counter[cp->protoidx] = 0;
1664 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1665 goto sta;
1666 break;
1667 default:
1668 printf(SPP_FMT "%s illegal %s in state %s\n",
1669 SPP_ARGS(ifp), cp->name,
1670 sppp_cp_type_name(h->type),
1671 sppp_state_name(sp->state[cp->protoidx]));
1672 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1673 }
1674 break;
1675 case TERM_ACK:
1676 switch (sp->state[cp->protoidx]) {
1677 case STATE_CLOSED:
1678 case STATE_STOPPED:
1679 case STATE_REQ_SENT:
1680 case STATE_ACK_SENT:
1681 break;
1682 case STATE_CLOSING:
1683 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1684 (cp->tlf)(sp);
1685 break;
1686 case STATE_STOPPING:
1687 sppp_cp_change_state(cp, sp, STATE_STOPPED);
1688 (cp->tlf)(sp);
1689 break;
1690 case STATE_ACK_RCVD:
1691 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1692 break;
1693 case STATE_OPENED:
1694 (cp->tld)(sp);
1695 (cp->scr)(sp);
1696 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1697 break;
1698 default:
1699 printf(SPP_FMT "%s illegal %s in state %s\n",
1700 SPP_ARGS(ifp), cp->name,
1701 sppp_cp_type_name(h->type),
1702 sppp_state_name(sp->state[cp->protoidx]));
1703 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1704 }
1705 break;
1706 case CODE_REJ:
1707 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1708 log(LOG_INFO,
1709 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1710 "danger will robinson\n",
1711 SPP_ARGS(ifp), cp->name,
1712 sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1713 switch (sp->state[cp->protoidx]) {
1714 case STATE_CLOSED:
1715 case STATE_STOPPED:
1716 case STATE_REQ_SENT:
1717 case STATE_ACK_SENT:
1718 case STATE_CLOSING:
1719 case STATE_STOPPING:
1720 case STATE_OPENED:
1721 break;
1722 case STATE_ACK_RCVD:
1723 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1724 break;
1725 default:
1726 printf(SPP_FMT "%s illegal %s in state %s\n",
1727 SPP_ARGS(ifp), cp->name,
1728 sppp_cp_type_name(h->type),
1729 sppp_state_name(sp->state[cp->protoidx]));
1730 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1731 }
1732 break;
1733 case PROTO_REJ:
1734 {
1735 int catastrophic;
1736 const struct cp *upper;
1737 int i;
1738 u_int16_t proto;
1739
1740 catastrophic = 0;
1741 upper = NULL;
1742 proto = ntohs(*((u_int16_t *)p));
1743 for (i = 0; i < IDX_COUNT; i++) {
1744 if (cps[i]->proto == proto) {
1745 upper = cps[i];
1746 break;
1747 }
1748 }
1749 if (upper == NULL)
1750 catastrophic++;
1751
1752 if (catastrophic || debug)
1753 log(catastrophic? LOG_INFO: LOG_DEBUG,
1754 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1755 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1756 sppp_cp_type_name(h->type), proto,
1757 upper ? upper->name : "unknown",
1758 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1759
1760 /*
1761 * if we got RXJ+ against conf-req, the peer does not implement
1762 * this particular protocol type. terminate the protocol.
1763 */
1764 if (upper && !catastrophic) {
1765 if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1766 upper->Close(sp);
1767 break;
1768 }
1769 }
1770
1771 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1772 switch (sp->state[cp->protoidx]) {
1773 case STATE_CLOSED:
1774 case STATE_STOPPED:
1775 case STATE_REQ_SENT:
1776 case STATE_ACK_SENT:
1777 case STATE_CLOSING:
1778 case STATE_STOPPING:
1779 case STATE_OPENED:
1780 break;
1781 case STATE_ACK_RCVD:
1782 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1783 break;
1784 default:
1785 printf(SPP_FMT "%s illegal %s in state %s\n",
1786 SPP_ARGS(ifp), cp->name,
1787 sppp_cp_type_name(h->type),
1788 sppp_state_name(sp->state[cp->protoidx]));
1789 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1790 }
1791 break;
1792 }
1793 case DISC_REQ:
1794 if (cp->proto != PPP_LCP)
1795 goto illegal;
1796 /* Discard the packet. */
1797 break;
1798 case ECHO_REQ:
1799 if (cp->proto != PPP_LCP)
1800 goto illegal;
1801 if (sp->state[cp->protoidx] != STATE_OPENED) {
1802 if (debug)
1803 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1804 SPP_ARGS(ifp));
1805 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1806 break;
1807 }
1808 if (len < 8) {
1809 if (debug)
1810 log(-1, SPP_FMT "invalid lcp echo request "
1811 "packet length: %d bytes\n",
1812 SPP_ARGS(ifp), len);
1813 break;
1814 }
1815 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1816 ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1817 /* Line loopback mode detected. */
1818 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1819 sp->pp_loopcnt = MAXALIVECNT * 5;
1820 if_down (ifp);
1821 sppp_qflush (&sp->pp_cpq);
1822
1823 /* Shut down the PPP link. */
1824 /* XXX */
1825 lcp.Down(sp);
1826 lcp.Up(sp);
1827 break;
1828 }
1829 *(long*)(h+1) = htonl (sp->lcp.magic);
1830 if (debug)
1831 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1832 SPP_ARGS(ifp));
1833 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1834 break;
1835 case ECHO_REPLY:
1836 if (cp->proto != PPP_LCP)
1837 goto illegal;
1838 if (h->ident != sp->lcp.echoid) {
1839 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1840 break;
1841 }
1842 if (len < 8) {
1843 if (debug)
1844 log(-1, SPP_FMT "lcp invalid echo reply "
1845 "packet length: %d bytes\n",
1846 SPP_ARGS(ifp), len);
1847 break;
1848 }
1849 if (debug)
1850 log(-1, SPP_FMT "lcp got echo rep\n",
1851 SPP_ARGS(ifp));
1852 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1853 ntohl (*(long*)(h+1)) != sp->lcp.magic)
1854 sp->pp_alivecnt = 0;
1855 break;
1856 default:
1857 /* Unknown packet type -- send Code-Reject packet. */
1858 illegal:
1859 if (debug)
1860 log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1861 SPP_ARGS(ifp), cp->name, h->type);
1862 sppp_cp_send(sp, cp->proto, CODE_REJ,
1863 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1864 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1865 }
1866 }
1867
1868
1869 /*
1870 * The generic part of all Up/Down/Open/Close/TO event handlers.
1871 * Basically, the state transition handling in the automaton.
1872 */
1873 static void
sppp_up_event(const struct cp * cp,struct sppp * sp)1874 sppp_up_event(const struct cp *cp, struct sppp *sp)
1875 {
1876 STDDCL;
1877
1878 if (debug)
1879 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1880 SPP_ARGS(ifp), cp->name,
1881 sppp_state_name(sp->state[cp->protoidx]));
1882
1883 switch (sp->state[cp->protoidx]) {
1884 case STATE_INITIAL:
1885 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1886 break;
1887 case STATE_STARTING:
1888 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1889 (cp->scr)(sp);
1890 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1891 break;
1892 default:
1893 printf(SPP_FMT "%s illegal up in state %s\n",
1894 SPP_ARGS(ifp), cp->name,
1895 sppp_state_name(sp->state[cp->protoidx]));
1896 }
1897 }
1898
1899 static void
sppp_down_event(const struct cp * cp,struct sppp * sp)1900 sppp_down_event(const struct cp *cp, struct sppp *sp)
1901 {
1902 STDDCL;
1903
1904 if (debug)
1905 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1906 SPP_ARGS(ifp), cp->name,
1907 sppp_state_name(sp->state[cp->protoidx]));
1908
1909 switch (sp->state[cp->protoidx]) {
1910 case STATE_CLOSED:
1911 case STATE_CLOSING:
1912 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1913 break;
1914 case STATE_STOPPED:
1915 sppp_cp_change_state(cp, sp, STATE_STARTING);
1916 (cp->tls)(sp);
1917 break;
1918 case STATE_STOPPING:
1919 case STATE_REQ_SENT:
1920 case STATE_ACK_RCVD:
1921 case STATE_ACK_SENT:
1922 sppp_cp_change_state(cp, sp, STATE_STARTING);
1923 break;
1924 case STATE_OPENED:
1925 (cp->tld)(sp);
1926 sppp_cp_change_state(cp, sp, STATE_STARTING);
1927 break;
1928 default:
1929 printf(SPP_FMT "%s illegal down in state %s\n",
1930 SPP_ARGS(ifp), cp->name,
1931 sppp_state_name(sp->state[cp->protoidx]));
1932 }
1933 }
1934
1935
1936 static void
sppp_open_event(const struct cp * cp,struct sppp * sp)1937 sppp_open_event(const struct cp *cp, struct sppp *sp)
1938 {
1939 STDDCL;
1940
1941 if (debug)
1942 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1943 SPP_ARGS(ifp), cp->name,
1944 sppp_state_name(sp->state[cp->protoidx]));
1945
1946 switch (sp->state[cp->protoidx]) {
1947 case STATE_INITIAL:
1948 sppp_cp_change_state(cp, sp, STATE_STARTING);
1949 (cp->tls)(sp);
1950 break;
1951 case STATE_STARTING:
1952 break;
1953 case STATE_CLOSED:
1954 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1955 (cp->scr)(sp);
1956 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1957 break;
1958 case STATE_STOPPED:
1959 /*
1960 * Try escaping stopped state. This seems to bite
1961 * people occasionally, in particular for IPCP,
1962 * presumably following previous IPCP negotiation
1963 * aborts. Somehow, we must have missed a Down event
1964 * which would have caused a transition into starting
1965 * state, so as a bandaid we force the Down event now.
1966 * This effectively implements (something like the)
1967 * `restart' option mentioned in the state transition
1968 * table of RFC 1661.
1969 */
1970 sppp_cp_change_state(cp, sp, STATE_STARTING);
1971 (cp->tls)(sp);
1972 break;
1973 case STATE_STOPPING:
1974 case STATE_REQ_SENT:
1975 case STATE_ACK_RCVD:
1976 case STATE_ACK_SENT:
1977 case STATE_OPENED:
1978 break;
1979 case STATE_CLOSING:
1980 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1981 break;
1982 }
1983 }
1984
1985
1986 static void
sppp_close_event(const struct cp * cp,struct sppp * sp)1987 sppp_close_event(const struct cp *cp, struct sppp *sp)
1988 {
1989 STDDCL;
1990
1991 if (debug)
1992 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1993 SPP_ARGS(ifp), cp->name,
1994 sppp_state_name(sp->state[cp->protoidx]));
1995
1996 switch (sp->state[cp->protoidx]) {
1997 case STATE_INITIAL:
1998 case STATE_CLOSED:
1999 case STATE_CLOSING:
2000 break;
2001 case STATE_STARTING:
2002 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2003 (cp->tlf)(sp);
2004 break;
2005 case STATE_STOPPED:
2006 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2007 break;
2008 case STATE_STOPPING:
2009 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2010 break;
2011 case STATE_OPENED:
2012 (cp->tld)(sp);
2013 /* FALLTHROUGH */
2014 case STATE_REQ_SENT:
2015 case STATE_ACK_RCVD:
2016 case STATE_ACK_SENT:
2017 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2018 sppp_cp_send(sp, cp->proto, TERM_REQ,
2019 ++sp->pp_seq[cp->protoidx], 0, 0);
2020 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2021 break;
2022 }
2023 }
2024
2025 static void
sppp_to_event(const struct cp * cp,struct sppp * sp)2026 sppp_to_event(const struct cp *cp, struct sppp *sp)
2027 {
2028 STDDCL;
2029
2030 SPPP_LOCK(sp);
2031 if (debug)
2032 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2033 SPP_ARGS(ifp), cp->name,
2034 sppp_state_name(sp->state[cp->protoidx]),
2035 sp->rst_counter[cp->protoidx]);
2036
2037 if (--sp->rst_counter[cp->protoidx] < 0)
2038 /* TO- event */
2039 switch (sp->state[cp->protoidx]) {
2040 case STATE_CLOSING:
2041 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2042 (cp->tlf)(sp);
2043 break;
2044 case STATE_STOPPING:
2045 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2046 (cp->tlf)(sp);
2047 break;
2048 case STATE_REQ_SENT:
2049 case STATE_ACK_RCVD:
2050 case STATE_ACK_SENT:
2051 sppp_cp_change_state(cp, sp, STATE_STOPPED);
2052 (cp->tlf)(sp);
2053 break;
2054 }
2055 else
2056 /* TO+ event */
2057 switch (sp->state[cp->protoidx]) {
2058 case STATE_CLOSING:
2059 case STATE_STOPPING:
2060 sppp_cp_send(sp, cp->proto, TERM_REQ,
2061 ++sp->pp_seq[cp->protoidx], 0, 0);
2062 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2063 cp->TO, (void *)sp);
2064 break;
2065 case STATE_REQ_SENT:
2066 case STATE_ACK_RCVD:
2067 (cp->scr)(sp);
2068 /* sppp_cp_change_state() will restart the timer */
2069 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2070 break;
2071 case STATE_ACK_SENT:
2072 (cp->scr)(sp);
2073 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2074 cp->TO, (void *)sp);
2075 break;
2076 }
2077
2078 SPPP_UNLOCK(sp);
2079 }
2080
2081 /*
2082 * Change the state of a control protocol in the state automaton.
2083 * Takes care of starting/stopping the restart timer.
2084 */
2085 static void
sppp_cp_change_state(const struct cp * cp,struct sppp * sp,int newstate)2086 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2087 {
2088 sp->state[cp->protoidx] = newstate;
2089
2090 callout_stop (&sp->ch[cp->protoidx]);
2091
2092 switch (newstate) {
2093 case STATE_INITIAL:
2094 case STATE_STARTING:
2095 case STATE_CLOSED:
2096 case STATE_STOPPED:
2097 case STATE_OPENED:
2098 break;
2099 case STATE_CLOSING:
2100 case STATE_STOPPING:
2101 case STATE_REQ_SENT:
2102 case STATE_ACK_RCVD:
2103 case STATE_ACK_SENT:
2104 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2105 cp->TO, (void *)sp);
2106 break;
2107 }
2108 }
2109
2110 /*
2111 *--------------------------------------------------------------------------*
2112 * *
2113 * The LCP implementation. *
2114 * *
2115 *--------------------------------------------------------------------------*
2116 */
2117 static void
sppp_pp_up(struct sppp * sp)2118 sppp_pp_up(struct sppp *sp)
2119 {
2120 SPPP_LOCK(sp);
2121 lcp.Up(sp);
2122 SPPP_UNLOCK(sp);
2123 }
2124
2125 static void
sppp_pp_down(struct sppp * sp)2126 sppp_pp_down(struct sppp *sp)
2127 {
2128 SPPP_LOCK(sp);
2129 lcp.Down(sp);
2130 SPPP_UNLOCK(sp);
2131 }
2132
2133 static void
sppp_lcp_init(struct sppp * sp)2134 sppp_lcp_init(struct sppp *sp)
2135 {
2136 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2137 sp->lcp.magic = 0;
2138 sp->state[IDX_LCP] = STATE_INITIAL;
2139 sp->fail_counter[IDX_LCP] = 0;
2140 sp->pp_seq[IDX_LCP] = 0;
2141 sp->pp_rseq[IDX_LCP] = 0;
2142 sp->lcp.protos = 0;
2143 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2144
2145 /* Note that these values are relevant for all control protocols */
2146 sp->lcp.timeout = 3 * hz;
2147 sp->lcp.max_terminate = 2;
2148 sp->lcp.max_configure = 10;
2149 sp->lcp.max_failure = 10;
2150 callout_init(&sp->ch[IDX_LCP], 1);
2151 }
2152
2153 static void
sppp_lcp_up(struct sppp * sp)2154 sppp_lcp_up(struct sppp *sp)
2155 {
2156 STDDCL;
2157
2158 sp->pp_alivecnt = 0;
2159 sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2160 sp->lcp.magic = 0;
2161 sp->lcp.protos = 0;
2162 sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2163 /*
2164 * If we are authenticator, negotiate LCP_AUTH
2165 */
2166 if (sp->hisauth.proto != 0)
2167 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2168 else
2169 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2170 sp->pp_flags &= ~PP_NEEDAUTH;
2171 /*
2172 * If this interface is passive or dial-on-demand, and we are
2173 * still in Initial state, it means we've got an incoming
2174 * call. Activate the interface.
2175 */
2176 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2177 if (debug)
2178 log(LOG_DEBUG,
2179 SPP_FMT "Up event", SPP_ARGS(ifp));
2180 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2181 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2182 if (debug)
2183 log(-1, "(incoming call)\n");
2184 sp->pp_flags |= PP_CALLIN;
2185 lcp.Open(sp);
2186 } else if (debug)
2187 log(-1, "\n");
2188 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2189 (sp->state[IDX_LCP] == STATE_INITIAL)) {
2190 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2191 lcp.Open(sp);
2192 }
2193
2194 sppp_up_event(&lcp, sp);
2195 }
2196
2197 static void
sppp_lcp_down(struct sppp * sp)2198 sppp_lcp_down(struct sppp *sp)
2199 {
2200 STDDCL;
2201
2202 sppp_down_event(&lcp, sp);
2203
2204 /*
2205 * If this is neither a dial-on-demand nor a passive
2206 * interface, simulate an ``ifconfig down'' action, so the
2207 * administrator can force a redial by another ``ifconfig
2208 * up''. XXX For leased line operation, should we immediately
2209 * try to reopen the connection here?
2210 */
2211 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2212 log(LOG_INFO,
2213 SPP_FMT "Down event, taking interface down.\n",
2214 SPP_ARGS(ifp));
2215 if_down(ifp);
2216 } else {
2217 if (debug)
2218 log(LOG_DEBUG,
2219 SPP_FMT "Down event (carrier loss)\n",
2220 SPP_ARGS(ifp));
2221 sp->pp_flags &= ~PP_CALLIN;
2222 if (sp->state[IDX_LCP] != STATE_INITIAL)
2223 lcp.Close(sp);
2224 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2225 }
2226 }
2227
2228 static void
sppp_lcp_open(struct sppp * sp)2229 sppp_lcp_open(struct sppp *sp)
2230 {
2231 sppp_open_event(&lcp, sp);
2232 }
2233
2234 static void
sppp_lcp_close(struct sppp * sp)2235 sppp_lcp_close(struct sppp *sp)
2236 {
2237 sppp_close_event(&lcp, sp);
2238 }
2239
2240 static void
sppp_lcp_TO(void * cookie)2241 sppp_lcp_TO(void *cookie)
2242 {
2243 sppp_to_event(&lcp, (struct sppp *)cookie);
2244 }
2245
2246 /*
2247 * Analyze a configure request. Return true if it was agreeable, and
2248 * caused action sca, false if it has been rejected or nak'ed, and
2249 * caused action scn. (The return value is used to make the state
2250 * transition decision in the state automaton.)
2251 */
2252 static int
sppp_lcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2253 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2254 {
2255 STDDCL;
2256 u_char *buf, *r, *p;
2257 int origlen, rlen;
2258 u_long nmagic;
2259 u_short authproto;
2260
2261 len -= 4;
2262 origlen = len;
2263 buf = r = malloc (len, M_TEMP, M_NOWAIT);
2264 if (! buf)
2265 return (0);
2266
2267 if (debug)
2268 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2269 SPP_ARGS(ifp));
2270
2271 /* pass 1: check for things that need to be rejected */
2272 p = (void*) (h+1);
2273 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2274 len-=p[1], p+=p[1]) {
2275 if (debug)
2276 log(-1, " %s ", sppp_lcp_opt_name(*p));
2277 switch (*p) {
2278 case LCP_OPT_MAGIC:
2279 /* Magic number. */
2280 if (len >= 6 && p[1] == 6)
2281 continue;
2282 if (debug)
2283 log(-1, "[invalid] ");
2284 break;
2285 case LCP_OPT_ASYNC_MAP:
2286 /* Async control character map. */
2287 if (len >= 6 && p[1] == 6)
2288 continue;
2289 if (debug)
2290 log(-1, "[invalid] ");
2291 break;
2292 case LCP_OPT_MRU:
2293 /* Maximum receive unit. */
2294 if (len >= 4 && p[1] == 4)
2295 continue;
2296 if (debug)
2297 log(-1, "[invalid] ");
2298 break;
2299 case LCP_OPT_AUTH_PROTO:
2300 if (len < 4) {
2301 if (debug)
2302 log(-1, "[invalid] ");
2303 break;
2304 }
2305 authproto = (p[2] << 8) + p[3];
2306 if (authproto == PPP_CHAP && p[1] != 5) {
2307 if (debug)
2308 log(-1, "[invalid chap len] ");
2309 break;
2310 }
2311 if (sp->myauth.proto == 0) {
2312 /* we are not configured to do auth */
2313 if (debug)
2314 log(-1, "[not configured] ");
2315 break;
2316 }
2317 /*
2318 * Remote want us to authenticate, remember this,
2319 * so we stay in PHASE_AUTHENTICATE after LCP got
2320 * up.
2321 */
2322 sp->pp_flags |= PP_NEEDAUTH;
2323 continue;
2324 default:
2325 /* Others not supported. */
2326 if (debug)
2327 log(-1, "[rej] ");
2328 break;
2329 }
2330 /* Add the option to rejected list. */
2331 bcopy (p, r, p[1]);
2332 r += p[1];
2333 rlen += p[1];
2334 }
2335 if (rlen) {
2336 if (debug)
2337 log(-1, " send conf-rej\n");
2338 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2339 return 0;
2340 } else if (debug)
2341 log(-1, "\n");
2342
2343 /*
2344 * pass 2: check for option values that are unacceptable and
2345 * thus require to be nak'ed.
2346 */
2347 if (debug)
2348 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2349 SPP_ARGS(ifp));
2350
2351 p = (void*) (h+1);
2352 len = origlen;
2353 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2354 len-=p[1], p+=p[1]) {
2355 if (debug)
2356 log(-1, " %s ", sppp_lcp_opt_name(*p));
2357 switch (*p) {
2358 case LCP_OPT_MAGIC:
2359 /* Magic number -- extract. */
2360 nmagic = (u_long)p[2] << 24 |
2361 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2362 if (nmagic != sp->lcp.magic) {
2363 sp->pp_loopcnt = 0;
2364 if (debug)
2365 log(-1, "0x%lx ", nmagic);
2366 continue;
2367 }
2368 if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2369 log(-1, "[glitch] ");
2370 ++sp->pp_loopcnt;
2371 /*
2372 * We negate our magic here, and NAK it. If
2373 * we see it later in an NAK packet, we
2374 * suggest a new one.
2375 */
2376 nmagic = ~sp->lcp.magic;
2377 /* Gonna NAK it. */
2378 p[2] = nmagic >> 24;
2379 p[3] = nmagic >> 16;
2380 p[4] = nmagic >> 8;
2381 p[5] = nmagic;
2382 break;
2383
2384 case LCP_OPT_ASYNC_MAP:
2385 /*
2386 * Async control character map -- just ignore it.
2387 *
2388 * Quote from RFC 1662, chapter 6:
2389 * To enable this functionality, synchronous PPP
2390 * implementations MUST always respond to the
2391 * Async-Control-Character-Map Configuration
2392 * Option with the LCP Configure-Ack. However,
2393 * acceptance of the Configuration Option does
2394 * not imply that the synchronous implementation
2395 * will do any ACCM mapping. Instead, all such
2396 * octet mapping will be performed by the
2397 * asynchronous-to-synchronous converter.
2398 */
2399 continue;
2400
2401 case LCP_OPT_MRU:
2402 /*
2403 * Maximum receive unit. Always agreeable,
2404 * but ignored by now.
2405 */
2406 sp->lcp.their_mru = p[2] * 256 + p[3];
2407 if (debug)
2408 log(-1, "%lu ", sp->lcp.their_mru);
2409 continue;
2410
2411 case LCP_OPT_AUTH_PROTO:
2412 authproto = (p[2] << 8) + p[3];
2413 if (sp->myauth.proto != authproto) {
2414 /* not agreed, nak */
2415 if (debug)
2416 log(-1, "[mine %s != his %s] ",
2417 sppp_proto_name(sp->hisauth.proto),
2418 sppp_proto_name(authproto));
2419 p[2] = sp->myauth.proto >> 8;
2420 p[3] = sp->myauth.proto;
2421 break;
2422 }
2423 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2424 if (debug)
2425 log(-1, "[chap not MD5] ");
2426 p[4] = CHAP_MD5;
2427 break;
2428 }
2429 continue;
2430 }
2431 /* Add the option to nak'ed list. */
2432 bcopy (p, r, p[1]);
2433 r += p[1];
2434 rlen += p[1];
2435 }
2436 if (rlen) {
2437 /*
2438 * Local and remote magics equal -- loopback?
2439 */
2440 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2441 if (sp->pp_loopcnt == MAXALIVECNT*5)
2442 printf (SPP_FMT "loopback\n",
2443 SPP_ARGS(ifp));
2444 if (ifp->if_flags & IFF_UP) {
2445 if_down(ifp);
2446 sppp_qflush(&sp->pp_cpq);
2447 /* XXX ? */
2448 lcp.Down(sp);
2449 lcp.Up(sp);
2450 }
2451 } else if (!sp->pp_loopcnt &&
2452 ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2453 if (debug)
2454 log(-1, " max_failure (%d) exceeded, "
2455 "send conf-rej\n",
2456 sp->lcp.max_failure);
2457 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2458 } else {
2459 if (debug)
2460 log(-1, " send conf-nak\n");
2461 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2462 }
2463 } else {
2464 if (debug)
2465 log(-1, " send conf-ack\n");
2466 sp->fail_counter[IDX_LCP] = 0;
2467 sp->pp_loopcnt = 0;
2468 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2469 h->ident, origlen, h+1);
2470 }
2471
2472 free (buf, M_TEMP);
2473 return (rlen == 0);
2474 }
2475
2476 /*
2477 * Analyze the LCP Configure-Reject option list, and adjust our
2478 * negotiation.
2479 */
2480 static void
sppp_lcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)2481 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2482 {
2483 STDDCL;
2484 u_char *buf, *p;
2485
2486 len -= 4;
2487 buf = malloc (len, M_TEMP, M_NOWAIT);
2488 if (!buf)
2489 return;
2490
2491 if (debug)
2492 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2493 SPP_ARGS(ifp));
2494
2495 p = (void*) (h+1);
2496 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2497 len -= p[1], p += p[1]) {
2498 if (debug)
2499 log(-1, " %s ", sppp_lcp_opt_name(*p));
2500 switch (*p) {
2501 case LCP_OPT_MAGIC:
2502 /* Magic number -- can't use it, use 0 */
2503 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2504 sp->lcp.magic = 0;
2505 break;
2506 case LCP_OPT_MRU:
2507 /*
2508 * Should not be rejected anyway, since we only
2509 * negotiate a MRU if explicitly requested by
2510 * peer.
2511 */
2512 sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2513 break;
2514 case LCP_OPT_AUTH_PROTO:
2515 /*
2516 * Peer doesn't want to authenticate himself,
2517 * deny unless this is a dialout call, and
2518 * AUTHFLAG_NOCALLOUT is set.
2519 */
2520 if ((sp->pp_flags & PP_CALLIN) == 0 &&
2521 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2522 if (debug)
2523 log(-1, "[don't insist on auth "
2524 "for callout]");
2525 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2526 break;
2527 }
2528 if (debug)
2529 log(-1, "[access denied]\n");
2530 lcp.Close(sp);
2531 break;
2532 }
2533 }
2534 if (debug)
2535 log(-1, "\n");
2536 free (buf, M_TEMP);
2537 return;
2538 }
2539
2540 /*
2541 * Analyze the LCP Configure-NAK option list, and adjust our
2542 * negotiation.
2543 */
2544 static void
sppp_lcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)2545 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2546 {
2547 STDDCL;
2548 u_char *buf, *p;
2549 u_long magic;
2550
2551 len -= 4;
2552 buf = malloc (len, M_TEMP, M_NOWAIT);
2553 if (!buf)
2554 return;
2555
2556 if (debug)
2557 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2558 SPP_ARGS(ifp));
2559
2560 p = (void*) (h+1);
2561 for (; len >= 2 && p[1] >= 2 && len >= p[1];
2562 len -= p[1], p += p[1]) {
2563 if (debug)
2564 log(-1, " %s ", sppp_lcp_opt_name(*p));
2565 switch (*p) {
2566 case LCP_OPT_MAGIC:
2567 /* Magic number -- renegotiate */
2568 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2569 len >= 6 && p[1] == 6) {
2570 magic = (u_long)p[2] << 24 |
2571 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2572 /*
2573 * If the remote magic is our negated one,
2574 * this looks like a loopback problem.
2575 * Suggest a new magic to make sure.
2576 */
2577 if (magic == ~sp->lcp.magic) {
2578 if (debug)
2579 log(-1, "magic glitch ");
2580 sp->lcp.magic = random();
2581 } else {
2582 sp->lcp.magic = magic;
2583 if (debug)
2584 log(-1, "%lu ", magic);
2585 }
2586 }
2587 break;
2588 case LCP_OPT_MRU:
2589 /*
2590 * Peer wants to advise us to negotiate an MRU.
2591 * Agree on it if it's reasonable, or use
2592 * default otherwise.
2593 */
2594 if (len >= 4 && p[1] == 4) {
2595 u_int mru = p[2] * 256 + p[3];
2596 if (debug)
2597 log(-1, "%d ", mru);
2598 if (mru < PP_MTU || mru > PP_MAX_MRU)
2599 mru = PP_MTU;
2600 sp->lcp.mru = mru;
2601 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2602 }
2603 break;
2604 case LCP_OPT_AUTH_PROTO:
2605 /*
2606 * Peer doesn't like our authentication method,
2607 * deny.
2608 */
2609 if (debug)
2610 log(-1, "[access denied]\n");
2611 lcp.Close(sp);
2612 break;
2613 }
2614 }
2615 if (debug)
2616 log(-1, "\n");
2617 free (buf, M_TEMP);
2618 return;
2619 }
2620
2621 static void
sppp_lcp_tlu(struct sppp * sp)2622 sppp_lcp_tlu(struct sppp *sp)
2623 {
2624 STDDCL;
2625 int i;
2626 u_long mask;
2627
2628 /* XXX ? */
2629 if (! (ifp->if_flags & IFF_UP) &&
2630 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2631 /* Coming out of loopback mode. */
2632 if_up(ifp);
2633 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2634 }
2635
2636 for (i = 0; i < IDX_COUNT; i++)
2637 if ((cps[i])->flags & CP_QUAL)
2638 (cps[i])->Open(sp);
2639
2640 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2641 (sp->pp_flags & PP_NEEDAUTH) != 0)
2642 sp->pp_phase = PHASE_AUTHENTICATE;
2643 else
2644 sp->pp_phase = PHASE_NETWORK;
2645
2646 if (debug)
2647 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2648 sppp_phase_name(sp->pp_phase));
2649
2650 /*
2651 * Open all authentication protocols. This is even required
2652 * if we already proceeded to network phase, since it might be
2653 * that remote wants us to authenticate, so we might have to
2654 * send a PAP request. Undesired authentication protocols
2655 * don't do anything when they get an Open event.
2656 */
2657 for (i = 0; i < IDX_COUNT; i++)
2658 if ((cps[i])->flags & CP_AUTH)
2659 (cps[i])->Open(sp);
2660
2661 if (sp->pp_phase == PHASE_NETWORK) {
2662 /* Notify all NCPs. */
2663 for (i = 0; i < IDX_COUNT; i++)
2664 if (((cps[i])->flags & CP_NCP) &&
2665 /*
2666 * XXX
2667 * Hack to administratively disable IPv6 if
2668 * not desired. Perhaps we should have another
2669 * flag for this, but right now, we can make
2670 * all struct cp's read/only.
2671 */
2672 (cps[i] != &ipv6cp ||
2673 (sp->confflags & CONF_ENABLE_IPV6)))
2674 (cps[i])->Open(sp);
2675 }
2676
2677 /* Send Up events to all started protos. */
2678 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2679 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2680 (cps[i])->Up(sp);
2681
2682 /* notify low-level driver of state change */
2683 if (sp->pp_chg)
2684 sp->pp_chg(sp, (int)sp->pp_phase);
2685
2686 if (sp->pp_phase == PHASE_NETWORK)
2687 /* if no NCP is starting, close down */
2688 sppp_lcp_check_and_close(sp);
2689 }
2690
2691 static void
sppp_lcp_tld(struct sppp * sp)2692 sppp_lcp_tld(struct sppp *sp)
2693 {
2694 STDDCL;
2695 int i;
2696 u_long mask;
2697
2698 sp->pp_phase = PHASE_TERMINATE;
2699
2700 if (debug)
2701 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2702 sppp_phase_name(sp->pp_phase));
2703
2704 /*
2705 * Take upper layers down. We send the Down event first and
2706 * the Close second to prevent the upper layers from sending
2707 * ``a flurry of terminate-request packets'', as the RFC
2708 * describes it.
2709 */
2710 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2711 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2712 (cps[i])->Down(sp);
2713 (cps[i])->Close(sp);
2714 }
2715 }
2716
2717 static void
sppp_lcp_tls(struct sppp * sp)2718 sppp_lcp_tls(struct sppp *sp)
2719 {
2720 STDDCL;
2721
2722 sp->pp_phase = PHASE_ESTABLISH;
2723
2724 if (debug)
2725 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2726 sppp_phase_name(sp->pp_phase));
2727
2728 /* Notify lower layer if desired. */
2729 if (sp->pp_tls)
2730 (sp->pp_tls)(sp);
2731 else
2732 (sp->pp_up)(sp);
2733 }
2734
2735 static void
sppp_lcp_tlf(struct sppp * sp)2736 sppp_lcp_tlf(struct sppp *sp)
2737 {
2738 STDDCL;
2739
2740 sp->pp_phase = PHASE_DEAD;
2741 if (debug)
2742 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2743 sppp_phase_name(sp->pp_phase));
2744
2745 /* Notify lower layer if desired. */
2746 if (sp->pp_tlf)
2747 (sp->pp_tlf)(sp);
2748 else
2749 (sp->pp_down)(sp);
2750 }
2751
2752 static void
sppp_lcp_scr(struct sppp * sp)2753 sppp_lcp_scr(struct sppp *sp)
2754 {
2755 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2756 int i = 0;
2757 u_short authproto;
2758
2759 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2760 if (! sp->lcp.magic)
2761 sp->lcp.magic = random();
2762 opt[i++] = LCP_OPT_MAGIC;
2763 opt[i++] = 6;
2764 opt[i++] = sp->lcp.magic >> 24;
2765 opt[i++] = sp->lcp.magic >> 16;
2766 opt[i++] = sp->lcp.magic >> 8;
2767 opt[i++] = sp->lcp.magic;
2768 }
2769
2770 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2771 opt[i++] = LCP_OPT_MRU;
2772 opt[i++] = 4;
2773 opt[i++] = sp->lcp.mru >> 8;
2774 opt[i++] = sp->lcp.mru;
2775 }
2776
2777 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2778 authproto = sp->hisauth.proto;
2779 opt[i++] = LCP_OPT_AUTH_PROTO;
2780 opt[i++] = authproto == PPP_CHAP? 5: 4;
2781 opt[i++] = authproto >> 8;
2782 opt[i++] = authproto;
2783 if (authproto == PPP_CHAP)
2784 opt[i++] = CHAP_MD5;
2785 }
2786
2787 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2788 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2789 }
2790
2791 /*
2792 * Check the open NCPs, return true if at least one NCP is open.
2793 */
2794 static int
sppp_ncp_check(struct sppp * sp)2795 sppp_ncp_check(struct sppp *sp)
2796 {
2797 int i, mask;
2798
2799 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2800 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2801 return 1;
2802 return 0;
2803 }
2804
2805 /*
2806 * Re-check the open NCPs and see if we should terminate the link.
2807 * Called by the NCPs during their tlf action handling.
2808 */
2809 static void
sppp_lcp_check_and_close(struct sppp * sp)2810 sppp_lcp_check_and_close(struct sppp *sp)
2811 {
2812
2813 if (sp->pp_phase < PHASE_NETWORK)
2814 /* don't bother, we are already going down */
2815 return;
2816
2817 if (sppp_ncp_check(sp))
2818 return;
2819
2820 lcp.Close(sp);
2821 }
2822
2823 /*
2824 *--------------------------------------------------------------------------*
2825 * *
2826 * The IPCP implementation. *
2827 * *
2828 *--------------------------------------------------------------------------*
2829 */
2830
2831 #ifdef INET
2832 static void
sppp_ipcp_init(struct sppp * sp)2833 sppp_ipcp_init(struct sppp *sp)
2834 {
2835 sp->ipcp.opts = 0;
2836 sp->ipcp.flags = 0;
2837 sp->state[IDX_IPCP] = STATE_INITIAL;
2838 sp->fail_counter[IDX_IPCP] = 0;
2839 sp->pp_seq[IDX_IPCP] = 0;
2840 sp->pp_rseq[IDX_IPCP] = 0;
2841 callout_init(&sp->ch[IDX_IPCP], 1);
2842 }
2843
2844 static void
sppp_ipcp_up(struct sppp * sp)2845 sppp_ipcp_up(struct sppp *sp)
2846 {
2847 sppp_up_event(&ipcp, sp);
2848 }
2849
2850 static void
sppp_ipcp_down(struct sppp * sp)2851 sppp_ipcp_down(struct sppp *sp)
2852 {
2853 sppp_down_event(&ipcp, sp);
2854 }
2855
2856 static void
sppp_ipcp_open(struct sppp * sp)2857 sppp_ipcp_open(struct sppp *sp)
2858 {
2859 STDDCL;
2860 u_long myaddr, hisaddr;
2861
2862 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2863 IPCP_MYADDR_DYN | IPCP_VJ);
2864 sp->ipcp.opts = 0;
2865
2866 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2867 /*
2868 * If we don't have his address, this probably means our
2869 * interface doesn't want to talk IP at all. (This could
2870 * be the case if somebody wants to speak only IPX, for
2871 * example.) Don't open IPCP in this case.
2872 */
2873 if (hisaddr == 0L) {
2874 /* XXX this message should go away */
2875 if (debug)
2876 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2877 SPP_ARGS(ifp));
2878 return;
2879 }
2880 if (myaddr == 0L) {
2881 /*
2882 * I don't have an assigned address, so i need to
2883 * negotiate my address.
2884 */
2885 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2886 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2887 } else
2888 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2889 if (sp->confflags & CONF_ENABLE_VJ) {
2890 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2891 sp->ipcp.max_state = MAX_STATES - 1;
2892 sp->ipcp.compress_cid = 1;
2893 }
2894 sppp_open_event(&ipcp, sp);
2895 }
2896
2897 static void
sppp_ipcp_close(struct sppp * sp)2898 sppp_ipcp_close(struct sppp *sp)
2899 {
2900 sppp_close_event(&ipcp, sp);
2901 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2902 /*
2903 * My address was dynamic, clear it again.
2904 */
2905 sppp_set_ip_addr(sp, 0L);
2906 }
2907
2908 static void
sppp_ipcp_TO(void * cookie)2909 sppp_ipcp_TO(void *cookie)
2910 {
2911 sppp_to_event(&ipcp, (struct sppp *)cookie);
2912 }
2913
2914 /*
2915 * Analyze a configure request. Return true if it was agreeable, and
2916 * caused action sca, false if it has been rejected or nak'ed, and
2917 * caused action scn. (The return value is used to make the state
2918 * transition decision in the state automaton.)
2919 */
2920 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)2921 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2922 {
2923 u_char *buf, *r, *p;
2924 struct ifnet *ifp = SP2IFP(sp);
2925 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2926 u_long hisaddr, desiredaddr;
2927 int gotmyaddr = 0;
2928 int desiredcomp;
2929
2930 len -= 4;
2931 origlen = len;
2932 /*
2933 * Make sure to allocate a buf that can at least hold a
2934 * conf-nak with an `address' option. We might need it below.
2935 */
2936 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2937 if (! buf)
2938 return (0);
2939
2940 /* pass 1: see if we can recognize them */
2941 if (debug)
2942 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2943 SPP_ARGS(ifp));
2944 p = (void*) (h+1);
2945 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2946 len-=p[1], p+=p[1]) {
2947 if (debug)
2948 log(-1, " %s ", sppp_ipcp_opt_name(*p));
2949 switch (*p) {
2950 case IPCP_OPT_COMPRESSION:
2951 if (!(sp->confflags & CONF_ENABLE_VJ)) {
2952 /* VJ compression administratively disabled */
2953 if (debug)
2954 log(-1, "[locally disabled] ");
2955 break;
2956 }
2957 /*
2958 * In theory, we should only conf-rej an
2959 * option that is shorter than RFC 1618
2960 * requires (i.e. < 4), and should conf-nak
2961 * anything else that is not VJ. However,
2962 * since our algorithm always uses the
2963 * original option to NAK it with new values,
2964 * things would become more complicated. In
2965 * pratice, the only commonly implemented IP
2966 * compression option is VJ anyway, so the
2967 * difference is negligible.
2968 */
2969 if (len >= 6 && p[1] == 6) {
2970 /*
2971 * correctly formed compression option
2972 * that could be VJ compression
2973 */
2974 continue;
2975 }
2976 if (debug)
2977 log(-1,
2978 "optlen %d [invalid/unsupported] ",
2979 p[1]);
2980 break;
2981 case IPCP_OPT_ADDRESS:
2982 if (len >= 6 && p[1] == 6) {
2983 /* correctly formed address option */
2984 continue;
2985 }
2986 if (debug)
2987 log(-1, "[invalid] ");
2988 break;
2989 default:
2990 /* Others not supported. */
2991 if (debug)
2992 log(-1, "[rej] ");
2993 break;
2994 }
2995 /* Add the option to rejected list. */
2996 bcopy (p, r, p[1]);
2997 r += p[1];
2998 rlen += p[1];
2999 }
3000 if (rlen) {
3001 if (debug)
3002 log(-1, " send conf-rej\n");
3003 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3004 return 0;
3005 } else if (debug)
3006 log(-1, "\n");
3007
3008 /* pass 2: parse option values */
3009 sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3010 if (debug)
3011 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3012 SPP_ARGS(ifp));
3013 p = (void*) (h+1);
3014 len = origlen;
3015 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3016 len-=p[1], p+=p[1]) {
3017 if (debug)
3018 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3019 switch (*p) {
3020 case IPCP_OPT_COMPRESSION:
3021 desiredcomp = p[2] << 8 | p[3];
3022 /* We only support VJ */
3023 if (desiredcomp == IPCP_COMP_VJ) {
3024 if (debug)
3025 log(-1, "VJ [ack] ");
3026 sp->ipcp.flags |= IPCP_VJ;
3027 sl_compress_init(sp->pp_comp, p[4]);
3028 sp->ipcp.max_state = p[4];
3029 sp->ipcp.compress_cid = p[5];
3030 continue;
3031 }
3032 if (debug)
3033 log(-1,
3034 "compproto %#04x [not supported] ",
3035 desiredcomp);
3036 p[2] = IPCP_COMP_VJ >> 8;
3037 p[3] = IPCP_COMP_VJ;
3038 p[4] = sp->ipcp.max_state;
3039 p[5] = sp->ipcp.compress_cid;
3040 break;
3041 case IPCP_OPT_ADDRESS:
3042 /* This is the address he wants in his end */
3043 desiredaddr = p[2] << 24 | p[3] << 16 |
3044 p[4] << 8 | p[5];
3045 if (desiredaddr == hisaddr ||
3046 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3047 /*
3048 * Peer's address is same as our value,
3049 * or we have set it to 0.0.0.* to
3050 * indicate that we do not really care,
3051 * this is agreeable. Gonna conf-ack
3052 * it.
3053 */
3054 if (debug)
3055 log(-1, "%s [ack] ",
3056 sppp_dotted_quad(hisaddr));
3057 /* record that we've seen it already */
3058 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3059 continue;
3060 }
3061 /*
3062 * The address wasn't agreeable. This is either
3063 * he sent us 0.0.0.0, asking to assign him an
3064 * address, or he send us another address not
3065 * matching our value. Either case, we gonna
3066 * conf-nak it with our value.
3067 * XXX: we should "rej" if hisaddr == 0
3068 */
3069 if (debug) {
3070 if (desiredaddr == 0)
3071 log(-1, "[addr requested] ");
3072 else
3073 log(-1, "%s [not agreed] ",
3074 sppp_dotted_quad(desiredaddr));
3075
3076 }
3077 p[2] = hisaddr >> 24;
3078 p[3] = hisaddr >> 16;
3079 p[4] = hisaddr >> 8;
3080 p[5] = hisaddr;
3081 break;
3082 }
3083 /* Add the option to nak'ed list. */
3084 bcopy (p, r, p[1]);
3085 r += p[1];
3086 rlen += p[1];
3087 }
3088
3089 /*
3090 * If we are about to conf-ack the request, but haven't seen
3091 * his address so far, gonna conf-nak it instead, with the
3092 * `address' option present and our idea of his address being
3093 * filled in there, to request negotiation of both addresses.
3094 *
3095 * XXX This can result in an endless req - nak loop if peer
3096 * doesn't want to send us his address. Q: What should we do
3097 * about it? XXX A: implement the max-failure counter.
3098 */
3099 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3100 buf[0] = IPCP_OPT_ADDRESS;
3101 buf[1] = 6;
3102 buf[2] = hisaddr >> 24;
3103 buf[3] = hisaddr >> 16;
3104 buf[4] = hisaddr >> 8;
3105 buf[5] = hisaddr;
3106 rlen = 6;
3107 if (debug)
3108 log(-1, "still need hisaddr ");
3109 }
3110
3111 if (rlen) {
3112 if (debug)
3113 log(-1, " send conf-nak\n");
3114 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3115 } else {
3116 if (debug)
3117 log(-1, " send conf-ack\n");
3118 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3119 h->ident, origlen, h+1);
3120 }
3121
3122 free (buf, M_TEMP);
3123 return (rlen == 0);
3124 }
3125
3126 /*
3127 * Analyze the IPCP Configure-Reject option list, and adjust our
3128 * negotiation.
3129 */
3130 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3131 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3132 {
3133 u_char *buf, *p;
3134 struct ifnet *ifp = SP2IFP(sp);
3135 int debug = ifp->if_flags & IFF_DEBUG;
3136
3137 len -= 4;
3138 buf = malloc (len, M_TEMP, M_NOWAIT);
3139 if (!buf)
3140 return;
3141
3142 if (debug)
3143 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3144 SPP_ARGS(ifp));
3145
3146 p = (void*) (h+1);
3147 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3148 len -= p[1], p += p[1]) {
3149 if (debug)
3150 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3151 switch (*p) {
3152 case IPCP_OPT_COMPRESSION:
3153 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3154 break;
3155 case IPCP_OPT_ADDRESS:
3156 /*
3157 * Peer doesn't grok address option. This is
3158 * bad. XXX Should we better give up here?
3159 * XXX We could try old "addresses" option...
3160 */
3161 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3162 break;
3163 }
3164 }
3165 if (debug)
3166 log(-1, "\n");
3167 free (buf, M_TEMP);
3168 return;
3169 }
3170
3171 /*
3172 * Analyze the IPCP Configure-NAK option list, and adjust our
3173 * negotiation.
3174 */
3175 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3176 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3177 {
3178 u_char *buf, *p;
3179 struct ifnet *ifp = SP2IFP(sp);
3180 int debug = ifp->if_flags & IFF_DEBUG;
3181 int desiredcomp;
3182 u_long wantaddr;
3183
3184 len -= 4;
3185 buf = malloc (len, M_TEMP, M_NOWAIT);
3186 if (!buf)
3187 return;
3188
3189 if (debug)
3190 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3191 SPP_ARGS(ifp));
3192
3193 p = (void*) (h+1);
3194 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3195 len -= p[1], p += p[1]) {
3196 if (debug)
3197 log(-1, " %s ", sppp_ipcp_opt_name(*p));
3198 switch (*p) {
3199 case IPCP_OPT_COMPRESSION:
3200 if (len >= 6 && p[1] == 6) {
3201 desiredcomp = p[2] << 8 | p[3];
3202 if (debug)
3203 log(-1, "[wantcomp %#04x] ",
3204 desiredcomp);
3205 if (desiredcomp == IPCP_COMP_VJ) {
3206 sl_compress_init(sp->pp_comp, p[4]);
3207 sp->ipcp.max_state = p[4];
3208 sp->ipcp.compress_cid = p[5];
3209 if (debug)
3210 log(-1, "[agree] ");
3211 } else
3212 sp->ipcp.opts &=
3213 ~(1 << IPCP_OPT_COMPRESSION);
3214 }
3215 break;
3216 case IPCP_OPT_ADDRESS:
3217 /*
3218 * Peer doesn't like our local IP address. See
3219 * if we can do something for him. We'll drop
3220 * him our address then.
3221 */
3222 if (len >= 6 && p[1] == 6) {
3223 wantaddr = p[2] << 24 | p[3] << 16 |
3224 p[4] << 8 | p[5];
3225 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3226 if (debug)
3227 log(-1, "[wantaddr %s] ",
3228 sppp_dotted_quad(wantaddr));
3229 /*
3230 * When doing dynamic address assignment,
3231 * we accept his offer. Otherwise, we
3232 * ignore it and thus continue to negotiate
3233 * our already existing value.
3234 * XXX: Bogus, if he said no once, he'll
3235 * just say no again, might as well die.
3236 */
3237 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3238 sppp_set_ip_addr(sp, wantaddr);
3239 if (debug)
3240 log(-1, "[agree] ");
3241 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3242 }
3243 }
3244 break;
3245 }
3246 }
3247 if (debug)
3248 log(-1, "\n");
3249 free (buf, M_TEMP);
3250 return;
3251 }
3252
3253 static void
sppp_ipcp_tlu(struct sppp * sp)3254 sppp_ipcp_tlu(struct sppp *sp)
3255 {
3256 /* we are up - notify isdn daemon */
3257 if (sp->pp_con)
3258 sp->pp_con(sp);
3259 }
3260
3261 static void
sppp_ipcp_tld(struct sppp * sp)3262 sppp_ipcp_tld(struct sppp *sp)
3263 {
3264 }
3265
3266 static void
sppp_ipcp_tls(struct sppp * sp)3267 sppp_ipcp_tls(struct sppp *sp)
3268 {
3269 /* indicate to LCP that it must stay alive */
3270 sp->lcp.protos |= (1 << IDX_IPCP);
3271 }
3272
3273 static void
sppp_ipcp_tlf(struct sppp * sp)3274 sppp_ipcp_tlf(struct sppp *sp)
3275 {
3276 /* we no longer need LCP */
3277 sp->lcp.protos &= ~(1 << IDX_IPCP);
3278 sppp_lcp_check_and_close(sp);
3279 }
3280
3281 static void
sppp_ipcp_scr(struct sppp * sp)3282 sppp_ipcp_scr(struct sppp *sp)
3283 {
3284 char opt[6 /* compression */ + 6 /* address */];
3285 u_long ouraddr;
3286 int i = 0;
3287
3288 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3289 opt[i++] = IPCP_OPT_COMPRESSION;
3290 opt[i++] = 6;
3291 opt[i++] = IPCP_COMP_VJ >> 8;
3292 opt[i++] = IPCP_COMP_VJ;
3293 opt[i++] = sp->ipcp.max_state;
3294 opt[i++] = sp->ipcp.compress_cid;
3295 }
3296 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3297 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3298 opt[i++] = IPCP_OPT_ADDRESS;
3299 opt[i++] = 6;
3300 opt[i++] = ouraddr >> 24;
3301 opt[i++] = ouraddr >> 16;
3302 opt[i++] = ouraddr >> 8;
3303 opt[i++] = ouraddr;
3304 }
3305
3306 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3307 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3308 }
3309 #else /* !INET */
3310 static void
sppp_ipcp_init(struct sppp * sp)3311 sppp_ipcp_init(struct sppp *sp)
3312 {
3313 }
3314
3315 static void
sppp_ipcp_up(struct sppp * sp)3316 sppp_ipcp_up(struct sppp *sp)
3317 {
3318 }
3319
3320 static void
sppp_ipcp_down(struct sppp * sp)3321 sppp_ipcp_down(struct sppp *sp)
3322 {
3323 }
3324
3325 static void
sppp_ipcp_open(struct sppp * sp)3326 sppp_ipcp_open(struct sppp *sp)
3327 {
3328 }
3329
3330 static void
sppp_ipcp_close(struct sppp * sp)3331 sppp_ipcp_close(struct sppp *sp)
3332 {
3333 }
3334
3335 static void
sppp_ipcp_TO(void * cookie)3336 sppp_ipcp_TO(void *cookie)
3337 {
3338 }
3339
3340 static int
sppp_ipcp_RCR(struct sppp * sp,struct lcp_header * h,int len)3341 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3342 {
3343 return (0);
3344 }
3345
3346 static void
sppp_ipcp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3347 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3348 {
3349 }
3350
3351 static void
sppp_ipcp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3352 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3353 {
3354 }
3355
3356 static void
sppp_ipcp_tlu(struct sppp * sp)3357 sppp_ipcp_tlu(struct sppp *sp)
3358 {
3359 }
3360
3361 static void
sppp_ipcp_tld(struct sppp * sp)3362 sppp_ipcp_tld(struct sppp *sp)
3363 {
3364 }
3365
3366 static void
sppp_ipcp_tls(struct sppp * sp)3367 sppp_ipcp_tls(struct sppp *sp)
3368 {
3369 }
3370
3371 static void
sppp_ipcp_tlf(struct sppp * sp)3372 sppp_ipcp_tlf(struct sppp *sp)
3373 {
3374 }
3375
3376 static void
sppp_ipcp_scr(struct sppp * sp)3377 sppp_ipcp_scr(struct sppp *sp)
3378 {
3379 }
3380 #endif
3381
3382 /*
3383 *--------------------------------------------------------------------------*
3384 * *
3385 * The IPv6CP implementation. *
3386 * *
3387 *--------------------------------------------------------------------------*
3388 */
3389
3390 #ifdef INET6
3391 static void
sppp_ipv6cp_init(struct sppp * sp)3392 sppp_ipv6cp_init(struct sppp *sp)
3393 {
3394 sp->ipv6cp.opts = 0;
3395 sp->ipv6cp.flags = 0;
3396 sp->state[IDX_IPV6CP] = STATE_INITIAL;
3397 sp->fail_counter[IDX_IPV6CP] = 0;
3398 sp->pp_seq[IDX_IPV6CP] = 0;
3399 sp->pp_rseq[IDX_IPV6CP] = 0;
3400 callout_init(&sp->ch[IDX_IPV6CP], 1);
3401 }
3402
3403 static void
sppp_ipv6cp_up(struct sppp * sp)3404 sppp_ipv6cp_up(struct sppp *sp)
3405 {
3406 sppp_up_event(&ipv6cp, sp);
3407 }
3408
3409 static void
sppp_ipv6cp_down(struct sppp * sp)3410 sppp_ipv6cp_down(struct sppp *sp)
3411 {
3412 sppp_down_event(&ipv6cp, sp);
3413 }
3414
3415 static void
sppp_ipv6cp_open(struct sppp * sp)3416 sppp_ipv6cp_open(struct sppp *sp)
3417 {
3418 STDDCL;
3419 struct in6_addr myaddr, hisaddr;
3420
3421 #ifdef IPV6CP_MYIFID_DYN
3422 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3423 #else
3424 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3425 #endif
3426
3427 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3428 /*
3429 * If we don't have our address, this probably means our
3430 * interface doesn't want to talk IPv6 at all. (This could
3431 * be the case if somebody wants to speak only IPX, for
3432 * example.) Don't open IPv6CP in this case.
3433 */
3434 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3435 /* XXX this message should go away */
3436 if (debug)
3437 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3438 SPP_ARGS(ifp));
3439 return;
3440 }
3441
3442 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3443 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3444 sppp_open_event(&ipv6cp, sp);
3445 }
3446
3447 static void
sppp_ipv6cp_close(struct sppp * sp)3448 sppp_ipv6cp_close(struct sppp *sp)
3449 {
3450 sppp_close_event(&ipv6cp, sp);
3451 }
3452
3453 static void
sppp_ipv6cp_TO(void * cookie)3454 sppp_ipv6cp_TO(void *cookie)
3455 {
3456 sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3457 }
3458
3459 /*
3460 * Analyze a configure request. Return true if it was agreeable, and
3461 * caused action sca, false if it has been rejected or nak'ed, and
3462 * caused action scn. (The return value is used to make the state
3463 * transition decision in the state automaton.)
3464 */
3465 static int
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3466 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3467 {
3468 u_char *buf, *r, *p;
3469 struct ifnet *ifp = SP2IFP(sp);
3470 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3471 struct in6_addr myaddr, desiredaddr, suggestaddr;
3472 int ifidcount;
3473 int type;
3474 int collision, nohisaddr;
3475 char ip6buf[INET6_ADDRSTRLEN];
3476
3477 len -= 4;
3478 origlen = len;
3479 /*
3480 * Make sure to allocate a buf that can at least hold a
3481 * conf-nak with an `address' option. We might need it below.
3482 */
3483 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3484 if (! buf)
3485 return (0);
3486
3487 /* pass 1: see if we can recognize them */
3488 if (debug)
3489 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3490 SPP_ARGS(ifp));
3491 p = (void*) (h+1);
3492 ifidcount = 0;
3493 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3494 len-=p[1], p+=p[1]) {
3495 if (debug)
3496 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3497 switch (*p) {
3498 case IPV6CP_OPT_IFID:
3499 if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3500 /* correctly formed address option */
3501 ifidcount++;
3502 continue;
3503 }
3504 if (debug)
3505 log(-1, " [invalid]");
3506 break;
3507 #ifdef notyet
3508 case IPV6CP_OPT_COMPRESSION:
3509 if (len >= 4 && p[1] >= 4) {
3510 /* correctly formed compress option */
3511 continue;
3512 }
3513 if (debug)
3514 log(-1, " [invalid]");
3515 break;
3516 #endif
3517 default:
3518 /* Others not supported. */
3519 if (debug)
3520 log(-1, " [rej]");
3521 break;
3522 }
3523 /* Add the option to rejected list. */
3524 bcopy (p, r, p[1]);
3525 r += p[1];
3526 rlen += p[1];
3527 }
3528 if (rlen) {
3529 if (debug)
3530 log(-1, " send conf-rej\n");
3531 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3532 goto end;
3533 } else if (debug)
3534 log(-1, "\n");
3535
3536 /* pass 2: parse option values */
3537 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3538 if (debug)
3539 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3540 SPP_ARGS(ifp));
3541 p = (void*) (h+1);
3542 len = origlen;
3543 type = CONF_ACK;
3544 for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3545 len-=p[1], p+=p[1]) {
3546 if (debug)
3547 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3548 switch (*p) {
3549 #ifdef notyet
3550 case IPV6CP_OPT_COMPRESSION:
3551 continue;
3552 #endif
3553 case IPV6CP_OPT_IFID:
3554 bzero(&desiredaddr, sizeof(desiredaddr));
3555 bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3556 collision = (bcmp(&desiredaddr.s6_addr[8],
3557 &myaddr.s6_addr[8], 8) == 0);
3558 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3559
3560 desiredaddr.s6_addr16[0] = htons(0xfe80);
3561 (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3562
3563 if (!collision && !nohisaddr) {
3564 /* no collision, hisaddr known - Conf-Ack */
3565 type = CONF_ACK;
3566
3567 if (debug) {
3568 log(-1, " %s [%s]",
3569 ip6_sprintf(ip6buf, &desiredaddr),
3570 sppp_cp_type_name(type));
3571 }
3572 continue;
3573 }
3574
3575 bzero(&suggestaddr, sizeof(suggestaddr));
3576 if (collision && nohisaddr) {
3577 /* collision, hisaddr unknown - Conf-Rej */
3578 type = CONF_REJ;
3579 bzero(&p[2], 8);
3580 } else {
3581 /*
3582 * - no collision, hisaddr unknown, or
3583 * - collision, hisaddr known
3584 * Conf-Nak, suggest hisaddr
3585 */
3586 type = CONF_NAK;
3587 sppp_suggest_ip6_addr(sp, &suggestaddr);
3588 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3589 }
3590 if (debug)
3591 log(-1, " %s [%s]",
3592 ip6_sprintf(ip6buf, &desiredaddr),
3593 sppp_cp_type_name(type));
3594 break;
3595 }
3596 /* Add the option to nak'ed list. */
3597 bcopy (p, r, p[1]);
3598 r += p[1];
3599 rlen += p[1];
3600 }
3601
3602 if (rlen == 0 && type == CONF_ACK) {
3603 if (debug)
3604 log(-1, " send %s\n", sppp_cp_type_name(type));
3605 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3606 } else {
3607 #ifdef DIAGNOSTIC
3608 if (type == CONF_ACK)
3609 panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3610 #endif
3611
3612 if (debug) {
3613 log(-1, " send %s suggest %s\n",
3614 sppp_cp_type_name(type),
3615 ip6_sprintf(ip6buf, &suggestaddr));
3616 }
3617 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3618 }
3619
3620 end:
3621 free (buf, M_TEMP);
3622 return (rlen == 0);
3623 }
3624
3625 /*
3626 * Analyze the IPv6CP Configure-Reject option list, and adjust our
3627 * negotiation.
3628 */
3629 static void
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3630 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3631 {
3632 u_char *buf, *p;
3633 struct ifnet *ifp = SP2IFP(sp);
3634 int debug = ifp->if_flags & IFF_DEBUG;
3635
3636 len -= 4;
3637 buf = malloc (len, M_TEMP, M_NOWAIT);
3638 if (!buf)
3639 return;
3640
3641 if (debug)
3642 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3643 SPP_ARGS(ifp));
3644
3645 p = (void*) (h+1);
3646 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3647 len -= p[1], p += p[1]) {
3648 if (debug)
3649 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3650 switch (*p) {
3651 case IPV6CP_OPT_IFID:
3652 /*
3653 * Peer doesn't grok address option. This is
3654 * bad. XXX Should we better give up here?
3655 */
3656 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3657 break;
3658 #ifdef notyet
3659 case IPV6CP_OPT_COMPRESS:
3660 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3661 break;
3662 #endif
3663 }
3664 }
3665 if (debug)
3666 log(-1, "\n");
3667 free (buf, M_TEMP);
3668 return;
3669 }
3670
3671 /*
3672 * Analyze the IPv6CP Configure-NAK option list, and adjust our
3673 * negotiation.
3674 */
3675 static void
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3676 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3677 {
3678 u_char *buf, *p;
3679 struct ifnet *ifp = SP2IFP(sp);
3680 int debug = ifp->if_flags & IFF_DEBUG;
3681 struct in6_addr suggestaddr;
3682 char ip6buf[INET6_ADDRSTRLEN];
3683
3684 len -= 4;
3685 buf = malloc (len, M_TEMP, M_NOWAIT);
3686 if (!buf)
3687 return;
3688
3689 if (debug)
3690 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3691 SPP_ARGS(ifp));
3692
3693 p = (void*) (h+1);
3694 for (; len >= 2 && p[1] >= 2 && len >= p[1];
3695 len -= p[1], p += p[1]) {
3696 if (debug)
3697 log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3698 switch (*p) {
3699 case IPV6CP_OPT_IFID:
3700 /*
3701 * Peer doesn't like our local ifid. See
3702 * if we can do something for him. We'll drop
3703 * him our address then.
3704 */
3705 if (len < 10 || p[1] != 10)
3706 break;
3707 bzero(&suggestaddr, sizeof(suggestaddr));
3708 suggestaddr.s6_addr16[0] = htons(0xfe80);
3709 (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3710 bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3711
3712 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3713 if (debug)
3714 log(-1, " [suggestaddr %s]",
3715 ip6_sprintf(ip6buf, &suggestaddr));
3716 #ifdef IPV6CP_MYIFID_DYN
3717 /*
3718 * When doing dynamic address assignment,
3719 * we accept his offer.
3720 */
3721 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3722 struct in6_addr lastsuggest;
3723 /*
3724 * If <suggested myaddr from peer> equals to
3725 * <hisaddr we have suggested last time>,
3726 * we have a collision. generate new random
3727 * ifid.
3728 */
3729 sppp_suggest_ip6_addr(&lastsuggest);
3730 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3731 lastsuggest)) {
3732 if (debug)
3733 log(-1, " [random]");
3734 sppp_gen_ip6_addr(sp, &suggestaddr);
3735 }
3736 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3737 if (debug)
3738 log(-1, " [agree]");
3739 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3740 }
3741 #else
3742 /*
3743 * Since we do not do dynamic address assignment,
3744 * we ignore it and thus continue to negotiate
3745 * our already existing value. This can possibly
3746 * go into infinite request-reject loop.
3747 *
3748 * This is not likely because we normally use
3749 * ifid based on MAC-address.
3750 * If you have no ethernet card on the node, too bad.
3751 * XXX should we use fail_counter?
3752 */
3753 #endif
3754 break;
3755 #ifdef notyet
3756 case IPV6CP_OPT_COMPRESS:
3757 /*
3758 * Peer wants different compression parameters.
3759 */
3760 break;
3761 #endif
3762 }
3763 }
3764 if (debug)
3765 log(-1, "\n");
3766 free (buf, M_TEMP);
3767 return;
3768 }
3769 static void
sppp_ipv6cp_tlu(struct sppp * sp)3770 sppp_ipv6cp_tlu(struct sppp *sp)
3771 {
3772 /* we are up - notify isdn daemon */
3773 if (sp->pp_con)
3774 sp->pp_con(sp);
3775 }
3776
3777 static void
sppp_ipv6cp_tld(struct sppp * sp)3778 sppp_ipv6cp_tld(struct sppp *sp)
3779 {
3780 }
3781
3782 static void
sppp_ipv6cp_tls(struct sppp * sp)3783 sppp_ipv6cp_tls(struct sppp *sp)
3784 {
3785 /* indicate to LCP that it must stay alive */
3786 sp->lcp.protos |= (1 << IDX_IPV6CP);
3787 }
3788
3789 static void
sppp_ipv6cp_tlf(struct sppp * sp)3790 sppp_ipv6cp_tlf(struct sppp *sp)
3791 {
3792
3793 #if 0 /* need #if 0 to close IPv6CP properly */
3794 /* we no longer need LCP */
3795 sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3796 sppp_lcp_check_and_close(sp);
3797 #endif
3798 }
3799
3800 static void
sppp_ipv6cp_scr(struct sppp * sp)3801 sppp_ipv6cp_scr(struct sppp *sp)
3802 {
3803 char opt[10 /* ifid */ + 4 /* compression, minimum */];
3804 struct in6_addr ouraddr;
3805 int i = 0;
3806
3807 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3808 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3809 opt[i++] = IPV6CP_OPT_IFID;
3810 opt[i++] = 10;
3811 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3812 i += 8;
3813 }
3814
3815 #ifdef notyet
3816 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3817 opt[i++] = IPV6CP_OPT_COMPRESSION;
3818 opt[i++] = 4;
3819 opt[i++] = 0; /* TBD */
3820 opt[i++] = 0; /* TBD */
3821 /* variable length data may follow */
3822 }
3823 #endif
3824
3825 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3826 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3827 }
3828 #else /*INET6*/
sppp_ipv6cp_init(struct sppp * sp)3829 static void sppp_ipv6cp_init(struct sppp *sp)
3830 {
3831 }
3832
sppp_ipv6cp_up(struct sppp * sp)3833 static void sppp_ipv6cp_up(struct sppp *sp)
3834 {
3835 }
3836
sppp_ipv6cp_down(struct sppp * sp)3837 static void sppp_ipv6cp_down(struct sppp *sp)
3838 {
3839 }
3840
3841
sppp_ipv6cp_open(struct sppp * sp)3842 static void sppp_ipv6cp_open(struct sppp *sp)
3843 {
3844 }
3845
sppp_ipv6cp_close(struct sppp * sp)3846 static void sppp_ipv6cp_close(struct sppp *sp)
3847 {
3848 }
3849
sppp_ipv6cp_TO(void * sp)3850 static void sppp_ipv6cp_TO(void *sp)
3851 {
3852 }
3853
sppp_ipv6cp_RCR(struct sppp * sp,struct lcp_header * h,int len)3854 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3855 {
3856 return 0;
3857 }
3858
sppp_ipv6cp_RCN_rej(struct sppp * sp,struct lcp_header * h,int len)3859 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3860 {
3861 }
3862
sppp_ipv6cp_RCN_nak(struct sppp * sp,struct lcp_header * h,int len)3863 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3864 {
3865 }
3866
sppp_ipv6cp_tlu(struct sppp * sp)3867 static void sppp_ipv6cp_tlu(struct sppp *sp)
3868 {
3869 }
3870
sppp_ipv6cp_tld(struct sppp * sp)3871 static void sppp_ipv6cp_tld(struct sppp *sp)
3872 {
3873 }
3874
sppp_ipv6cp_tls(struct sppp * sp)3875 static void sppp_ipv6cp_tls(struct sppp *sp)
3876 {
3877 }
3878
sppp_ipv6cp_tlf(struct sppp * sp)3879 static void sppp_ipv6cp_tlf(struct sppp *sp)
3880 {
3881 }
3882
sppp_ipv6cp_scr(struct sppp * sp)3883 static void sppp_ipv6cp_scr(struct sppp *sp)
3884 {
3885 }
3886 #endif /*INET6*/
3887
3888 /*
3889 *--------------------------------------------------------------------------*
3890 * *
3891 * The CHAP implementation. *
3892 * *
3893 *--------------------------------------------------------------------------*
3894 */
3895
3896 /*
3897 * The authentication protocols don't employ a full-fledged state machine as
3898 * the control protocols do, since they do have Open and Close events, but
3899 * not Up and Down, nor are they explicitly terminated. Also, use of the
3900 * authentication protocols may be different in both directions (this makes
3901 * sense, think of a machine that never accepts incoming calls but only
3902 * calls out, it doesn't require the called party to authenticate itself).
3903 *
3904 * Our state machine for the local authentication protocol (we are requesting
3905 * the peer to authenticate) looks like:
3906 *
3907 * RCA-
3908 * +--------------------------------------------+
3909 * V scn,tld|
3910 * +--------+ Close +---------+ RCA+
3911 * | |<----------------------------------| |------+
3912 * +--->| Closed | TO* | Opened | sca |
3913 * | | |-----+ +-------| |<-----+
3914 * | +--------+ irc | | +---------+
3915 * | ^ | | ^
3916 * | | | | |
3917 * | | | | |
3918 * | TO-| | | |
3919 * | |tld TO+ V | |
3920 * | | +------->+ | |
3921 * | | | | | |
3922 * | +--------+ V | |
3923 * | | |<----+<--------------------+ |
3924 * | | Req- | scr |
3925 * | | Sent | |
3926 * | | | |
3927 * | +--------+ |
3928 * | RCA- | | RCA+ |
3929 * +------+ +------------------------------------------+
3930 * scn,tld sca,irc,ict,tlu
3931 *
3932 *
3933 * with:
3934 *
3935 * Open: LCP reached authentication phase
3936 * Close: LCP reached terminate phase
3937 *
3938 * RCA+: received reply (pap-req, chap-response), acceptable
3939 * RCN: received reply (pap-req, chap-response), not acceptable
3940 * TO+: timeout with restart counter >= 0
3941 * TO-: timeout with restart counter < 0
3942 * TO*: reschedule timeout for CHAP
3943 *
3944 * scr: send request packet (none for PAP, chap-challenge)
3945 * sca: send ack packet (pap-ack, chap-success)
3946 * scn: send nak packet (pap-nak, chap-failure)
3947 * ict: initialize re-challenge timer (CHAP only)
3948 *
3949 * tlu: this-layer-up, LCP reaches network phase
3950 * tld: this-layer-down, LCP enters terminate phase
3951 *
3952 * Note that in CHAP mode, after sending a new challenge, while the state
3953 * automaton falls back into Req-Sent state, it doesn't signal a tld
3954 * event to LCP, so LCP remains in network phase. Only after not getting
3955 * any response (or after getting an unacceptable response), CHAP closes,
3956 * causing LCP to enter terminate phase.
3957 *
3958 * With PAP, there is no initial request that can be sent. The peer is
3959 * expected to send one based on the successful negotiation of PAP as
3960 * the authentication protocol during the LCP option negotiation.
3961 *
3962 * Incoming authentication protocol requests (remote requests
3963 * authentication, we are peer) don't employ a state machine at all,
3964 * they are simply answered. Some peers [Ascend P50 firmware rev
3965 * 4.50] react allergically when sending IPCP requests while they are
3966 * still in authentication phase (thereby violating the standard that
3967 * demands that these NCP packets are to be discarded), so we keep
3968 * track of the peer demanding us to authenticate, and only proceed to
3969 * phase network once we've seen a positive acknowledge for the
3970 * authentication.
3971 */
3972
3973 /*
3974 * Handle incoming CHAP packets.
3975 */
3976 static void
sppp_chap_input(struct sppp * sp,struct mbuf * m)3977 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3978 {
3979 STDDCL;
3980 struct lcp_header *h;
3981 int len;
3982 u_char *value, *name, digest[AUTHKEYLEN], dsize;
3983 int value_len, name_len;
3984 MD5_CTX ctx;
3985
3986 len = m->m_pkthdr.len;
3987 if (len < 4) {
3988 if (debug)
3989 log(LOG_DEBUG,
3990 SPP_FMT "chap invalid packet length: %d bytes\n",
3991 SPP_ARGS(ifp), len);
3992 return;
3993 }
3994 h = mtod (m, struct lcp_header*);
3995 if (len > ntohs (h->len))
3996 len = ntohs (h->len);
3997
3998 switch (h->type) {
3999 /* challenge, failure and success are his authproto */
4000 case CHAP_CHALLENGE:
4001 value = 1 + (u_char*)(h+1);
4002 value_len = value[-1];
4003 name = value + value_len;
4004 name_len = len - value_len - 5;
4005 if (name_len < 0) {
4006 if (debug) {
4007 log(LOG_DEBUG,
4008 SPP_FMT "chap corrupted challenge "
4009 "<%s id=0x%x len=%d",
4010 SPP_ARGS(ifp),
4011 sppp_auth_type_name(PPP_CHAP, h->type),
4012 h->ident, ntohs(h->len));
4013 sppp_print_bytes((u_char*) (h+1), len-4);
4014 log(-1, ">\n");
4015 }
4016 break;
4017 }
4018
4019 if (debug) {
4020 log(LOG_DEBUG,
4021 SPP_FMT "chap input <%s id=0x%x len=%d name=",
4022 SPP_ARGS(ifp),
4023 sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4024 ntohs(h->len));
4025 sppp_print_string((char*) name, name_len);
4026 log(-1, " value-size=%d value=", value_len);
4027 sppp_print_bytes(value, value_len);
4028 log(-1, ">\n");
4029 }
4030
4031 /* Compute reply value. */
4032 MD5Init(&ctx);
4033 MD5Update(&ctx, &h->ident, 1);
4034 MD5Update(&ctx, sp->myauth.secret,
4035 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4036 MD5Update(&ctx, value, value_len);
4037 MD5Final(digest, &ctx);
4038 dsize = sizeof digest;
4039
4040 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4041 sizeof dsize, (const char *)&dsize,
4042 sizeof digest, digest,
4043 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4044 sp->myauth.name,
4045 0);
4046 break;
4047
4048 case CHAP_SUCCESS:
4049 if (debug) {
4050 log(LOG_DEBUG, SPP_FMT "chap success",
4051 SPP_ARGS(ifp));
4052 if (len > 4) {
4053 log(-1, ": ");
4054 sppp_print_string((char*)(h + 1), len - 4);
4055 }
4056 log(-1, "\n");
4057 }
4058 SPPP_LOCK(sp);
4059 sp->pp_flags &= ~PP_NEEDAUTH;
4060 if (sp->myauth.proto == PPP_CHAP &&
4061 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4062 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4063 /*
4064 * We are authenticator for CHAP but didn't
4065 * complete yet. Leave it to tlu to proceed
4066 * to network phase.
4067 */
4068 SPPP_UNLOCK(sp);
4069 break;
4070 }
4071 SPPP_UNLOCK(sp);
4072 sppp_phase_network(sp);
4073 break;
4074
4075 case CHAP_FAILURE:
4076 if (debug) {
4077 log(LOG_INFO, SPP_FMT "chap failure",
4078 SPP_ARGS(ifp));
4079 if (len > 4) {
4080 log(-1, ": ");
4081 sppp_print_string((char*)(h + 1), len - 4);
4082 }
4083 log(-1, "\n");
4084 } else
4085 log(LOG_INFO, SPP_FMT "chap failure\n",
4086 SPP_ARGS(ifp));
4087 /* await LCP shutdown by authenticator */
4088 break;
4089
4090 /* response is my authproto */
4091 case CHAP_RESPONSE:
4092 value = 1 + (u_char*)(h+1);
4093 value_len = value[-1];
4094 name = value + value_len;
4095 name_len = len - value_len - 5;
4096 if (name_len < 0) {
4097 if (debug) {
4098 log(LOG_DEBUG,
4099 SPP_FMT "chap corrupted response "
4100 "<%s id=0x%x len=%d",
4101 SPP_ARGS(ifp),
4102 sppp_auth_type_name(PPP_CHAP, h->type),
4103 h->ident, ntohs(h->len));
4104 sppp_print_bytes((u_char*)(h+1), len-4);
4105 log(-1, ">\n");
4106 }
4107 break;
4108 }
4109 if (h->ident != sp->confid[IDX_CHAP]) {
4110 if (debug)
4111 log(LOG_DEBUG,
4112 SPP_FMT "chap dropping response for old ID "
4113 "(got %d, expected %d)\n",
4114 SPP_ARGS(ifp),
4115 h->ident, sp->confid[IDX_CHAP]);
4116 break;
4117 }
4118 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4119 || bcmp(name, sp->hisauth.name, name_len) != 0) {
4120 log(LOG_INFO, SPP_FMT "chap response, his name ",
4121 SPP_ARGS(ifp));
4122 sppp_print_string(name, name_len);
4123 log(-1, " != expected ");
4124 sppp_print_string(sp->hisauth.name,
4125 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4126 log(-1, "\n");
4127 }
4128 if (debug) {
4129 log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4130 "<%s id=0x%x len=%d name=",
4131 SPP_ARGS(ifp),
4132 sppp_state_name(sp->state[IDX_CHAP]),
4133 sppp_auth_type_name(PPP_CHAP, h->type),
4134 h->ident, ntohs (h->len));
4135 sppp_print_string((char*)name, name_len);
4136 log(-1, " value-size=%d value=", value_len);
4137 sppp_print_bytes(value, value_len);
4138 log(-1, ">\n");
4139 }
4140 if (value_len != AUTHKEYLEN) {
4141 if (debug)
4142 log(LOG_DEBUG,
4143 SPP_FMT "chap bad hash value length: "
4144 "%d bytes, should be %d\n",
4145 SPP_ARGS(ifp), value_len,
4146 AUTHKEYLEN);
4147 break;
4148 }
4149
4150 MD5Init(&ctx);
4151 MD5Update(&ctx, &h->ident, 1);
4152 MD5Update(&ctx, sp->hisauth.secret,
4153 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4154 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4155 MD5Final(digest, &ctx);
4156
4157 #define FAILMSG "Failed..."
4158 #define SUCCMSG "Welcome!"
4159
4160 if (value_len != sizeof digest ||
4161 bcmp(digest, value, value_len) != 0) {
4162 /* action scn, tld */
4163 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4164 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4165 0);
4166 chap.tld(sp);
4167 break;
4168 }
4169 /* action sca, perhaps tlu */
4170 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4171 sp->state[IDX_CHAP] == STATE_OPENED)
4172 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4173 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4174 0);
4175 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4176 sppp_cp_change_state(&chap, sp, STATE_OPENED);
4177 chap.tlu(sp);
4178 }
4179 break;
4180
4181 default:
4182 /* Unknown CHAP packet type -- ignore. */
4183 if (debug) {
4184 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4185 "<0x%x id=0x%xh len=%d",
4186 SPP_ARGS(ifp),
4187 sppp_state_name(sp->state[IDX_CHAP]),
4188 h->type, h->ident, ntohs(h->len));
4189 sppp_print_bytes((u_char*)(h+1), len-4);
4190 log(-1, ">\n");
4191 }
4192 break;
4193
4194 }
4195 }
4196
4197 static void
sppp_chap_init(struct sppp * sp)4198 sppp_chap_init(struct sppp *sp)
4199 {
4200 /* Chap doesn't have STATE_INITIAL at all. */
4201 sp->state[IDX_CHAP] = STATE_CLOSED;
4202 sp->fail_counter[IDX_CHAP] = 0;
4203 sp->pp_seq[IDX_CHAP] = 0;
4204 sp->pp_rseq[IDX_CHAP] = 0;
4205 callout_init(&sp->ch[IDX_CHAP], 1);
4206 }
4207
4208 static void
sppp_chap_open(struct sppp * sp)4209 sppp_chap_open(struct sppp *sp)
4210 {
4211 if (sp->myauth.proto == PPP_CHAP &&
4212 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4213 /* we are authenticator for CHAP, start it */
4214 chap.scr(sp);
4215 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4216 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4217 }
4218 /* nothing to be done if we are peer, await a challenge */
4219 }
4220
4221 static void
sppp_chap_close(struct sppp * sp)4222 sppp_chap_close(struct sppp *sp)
4223 {
4224 if (sp->state[IDX_CHAP] != STATE_CLOSED)
4225 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4226 }
4227
4228 static void
sppp_chap_TO(void * cookie)4229 sppp_chap_TO(void *cookie)
4230 {
4231 struct sppp *sp = (struct sppp *)cookie;
4232 STDDCL;
4233
4234 SPPP_LOCK(sp);
4235 if (debug)
4236 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4237 SPP_ARGS(ifp),
4238 sppp_state_name(sp->state[IDX_CHAP]),
4239 sp->rst_counter[IDX_CHAP]);
4240
4241 if (--sp->rst_counter[IDX_CHAP] < 0)
4242 /* TO- event */
4243 switch (sp->state[IDX_CHAP]) {
4244 case STATE_REQ_SENT:
4245 chap.tld(sp);
4246 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4247 break;
4248 }
4249 else
4250 /* TO+ (or TO*) event */
4251 switch (sp->state[IDX_CHAP]) {
4252 case STATE_OPENED:
4253 /* TO* event */
4254 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4255 /* FALLTHROUGH */
4256 case STATE_REQ_SENT:
4257 chap.scr(sp);
4258 /* sppp_cp_change_state() will restart the timer */
4259 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4260 break;
4261 }
4262
4263 SPPP_UNLOCK(sp);
4264 }
4265
4266 static void
sppp_chap_tlu(struct sppp * sp)4267 sppp_chap_tlu(struct sppp *sp)
4268 {
4269 STDDCL;
4270 int i;
4271
4272 i = 0;
4273 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4274
4275 /*
4276 * Some broken CHAP implementations (Conware CoNet, firmware
4277 * 4.0.?) don't want to re-authenticate their CHAP once the
4278 * initial challenge-response exchange has taken place.
4279 * Provide for an option to avoid rechallenges.
4280 */
4281 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4282 /*
4283 * Compute the re-challenge timeout. This will yield
4284 * a number between 300 and 810 seconds.
4285 */
4286 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4287 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4288 }
4289
4290 if (debug) {
4291 log(LOG_DEBUG,
4292 SPP_FMT "chap %s, ",
4293 SPP_ARGS(ifp),
4294 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4295 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4296 log(-1, "next re-challenge in %d seconds\n", i);
4297 else
4298 log(-1, "re-challenging supressed\n");
4299 }
4300
4301 SPPP_LOCK(sp);
4302 /* indicate to LCP that we need to be closed down */
4303 sp->lcp.protos |= (1 << IDX_CHAP);
4304
4305 if (sp->pp_flags & PP_NEEDAUTH) {
4306 /*
4307 * Remote is authenticator, but his auth proto didn't
4308 * complete yet. Defer the transition to network
4309 * phase.
4310 */
4311 SPPP_UNLOCK(sp);
4312 return;
4313 }
4314 SPPP_UNLOCK(sp);
4315
4316 /*
4317 * If we are already in phase network, we are done here. This
4318 * is the case if this is a dummy tlu event after a re-challenge.
4319 */
4320 if (sp->pp_phase != PHASE_NETWORK)
4321 sppp_phase_network(sp);
4322 }
4323
4324 static void
sppp_chap_tld(struct sppp * sp)4325 sppp_chap_tld(struct sppp *sp)
4326 {
4327 STDDCL;
4328
4329 if (debug)
4330 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4331 callout_stop(&sp->ch[IDX_CHAP]);
4332 sp->lcp.protos &= ~(1 << IDX_CHAP);
4333
4334 lcp.Close(sp);
4335 }
4336
4337 static void
sppp_chap_scr(struct sppp * sp)4338 sppp_chap_scr(struct sppp *sp)
4339 {
4340 u_long *ch, seed;
4341 u_char clen;
4342
4343 /* Compute random challenge. */
4344 ch = (u_long *)sp->myauth.challenge;
4345 read_random(&seed, sizeof seed);
4346 ch[0] = seed ^ random();
4347 ch[1] = seed ^ random();
4348 ch[2] = seed ^ random();
4349 ch[3] = seed ^ random();
4350 clen = AUTHKEYLEN;
4351
4352 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4353
4354 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4355 sizeof clen, (const char *)&clen,
4356 (size_t)AUTHKEYLEN, sp->myauth.challenge,
4357 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4358 sp->myauth.name,
4359 0);
4360 }
4361
4362 /*
4363 *--------------------------------------------------------------------------*
4364 * *
4365 * The PAP implementation. *
4366 * *
4367 *--------------------------------------------------------------------------*
4368 */
4369 /*
4370 * For PAP, we need to keep a little state also if we are the peer, not the
4371 * authenticator. This is since we don't get a request to authenticate, but
4372 * have to repeatedly authenticate ourself until we got a response (or the
4373 * retry counter is expired).
4374 */
4375
4376 /*
4377 * Handle incoming PAP packets. */
4378 static void
sppp_pap_input(struct sppp * sp,struct mbuf * m)4379 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4380 {
4381 STDDCL;
4382 struct lcp_header *h;
4383 int len;
4384 u_char *name, *passwd, mlen;
4385 int name_len, passwd_len;
4386
4387 len = m->m_pkthdr.len;
4388 if (len < 5) {
4389 if (debug)
4390 log(LOG_DEBUG,
4391 SPP_FMT "pap invalid packet length: %d bytes\n",
4392 SPP_ARGS(ifp), len);
4393 return;
4394 }
4395 h = mtod (m, struct lcp_header*);
4396 if (len > ntohs (h->len))
4397 len = ntohs (h->len);
4398 switch (h->type) {
4399 /* PAP request is my authproto */
4400 case PAP_REQ:
4401 name = 1 + (u_char*)(h+1);
4402 name_len = name[-1];
4403 passwd = name + name_len + 1;
4404 if (name_len > len - 6 ||
4405 (passwd_len = passwd[-1]) > len - 6 - name_len) {
4406 if (debug) {
4407 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4408 "<%s id=0x%x len=%d",
4409 SPP_ARGS(ifp),
4410 sppp_auth_type_name(PPP_PAP, h->type),
4411 h->ident, ntohs(h->len));
4412 sppp_print_bytes((u_char*)(h+1), len-4);
4413 log(-1, ">\n");
4414 }
4415 break;
4416 }
4417 if (debug) {
4418 log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4419 "<%s id=0x%x len=%d name=",
4420 SPP_ARGS(ifp),
4421 sppp_state_name(sp->state[IDX_PAP]),
4422 sppp_auth_type_name(PPP_PAP, h->type),
4423 h->ident, ntohs(h->len));
4424 sppp_print_string((char*)name, name_len);
4425 log(-1, " passwd=");
4426 sppp_print_string((char*)passwd, passwd_len);
4427 log(-1, ">\n");
4428 }
4429 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4430 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4431 bcmp(name, sp->hisauth.name, name_len) != 0 ||
4432 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4433 /* action scn, tld */
4434 mlen = sizeof(FAILMSG) - 1;
4435 sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4436 sizeof mlen, (const char *)&mlen,
4437 sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4438 0);
4439 pap.tld(sp);
4440 break;
4441 }
4442 /* action sca, perhaps tlu */
4443 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4444 sp->state[IDX_PAP] == STATE_OPENED) {
4445 mlen = sizeof(SUCCMSG) - 1;
4446 sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4447 sizeof mlen, (const char *)&mlen,
4448 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4449 0);
4450 }
4451 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4452 sppp_cp_change_state(&pap, sp, STATE_OPENED);
4453 pap.tlu(sp);
4454 }
4455 break;
4456
4457 /* ack and nak are his authproto */
4458 case PAP_ACK:
4459 callout_stop(&sp->pap_my_to_ch);
4460 if (debug) {
4461 log(LOG_DEBUG, SPP_FMT "pap success",
4462 SPP_ARGS(ifp));
4463 name_len = *((char *)h);
4464 if (len > 5 && name_len) {
4465 log(-1, ": ");
4466 sppp_print_string((char*)(h+1), name_len);
4467 }
4468 log(-1, "\n");
4469 }
4470 SPPP_LOCK(sp);
4471 sp->pp_flags &= ~PP_NEEDAUTH;
4472 if (sp->myauth.proto == PPP_PAP &&
4473 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4474 (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4475 /*
4476 * We are authenticator for PAP but didn't
4477 * complete yet. Leave it to tlu to proceed
4478 * to network phase.
4479 */
4480 SPPP_UNLOCK(sp);
4481 break;
4482 }
4483 SPPP_UNLOCK(sp);
4484 sppp_phase_network(sp);
4485 break;
4486
4487 case PAP_NAK:
4488 callout_stop (&sp->pap_my_to_ch);
4489 if (debug) {
4490 log(LOG_INFO, SPP_FMT "pap failure",
4491 SPP_ARGS(ifp));
4492 name_len = *((char *)h);
4493 if (len > 5 && name_len) {
4494 log(-1, ": ");
4495 sppp_print_string((char*)(h+1), name_len);
4496 }
4497 log(-1, "\n");
4498 } else
4499 log(LOG_INFO, SPP_FMT "pap failure\n",
4500 SPP_ARGS(ifp));
4501 /* await LCP shutdown by authenticator */
4502 break;
4503
4504 default:
4505 /* Unknown PAP packet type -- ignore. */
4506 if (debug) {
4507 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4508 "<0x%x id=0x%x len=%d",
4509 SPP_ARGS(ifp),
4510 h->type, h->ident, ntohs(h->len));
4511 sppp_print_bytes((u_char*)(h+1), len-4);
4512 log(-1, ">\n");
4513 }
4514 break;
4515
4516 }
4517 }
4518
4519 static void
sppp_pap_init(struct sppp * sp)4520 sppp_pap_init(struct sppp *sp)
4521 {
4522 /* PAP doesn't have STATE_INITIAL at all. */
4523 sp->state[IDX_PAP] = STATE_CLOSED;
4524 sp->fail_counter[IDX_PAP] = 0;
4525 sp->pp_seq[IDX_PAP] = 0;
4526 sp->pp_rseq[IDX_PAP] = 0;
4527 callout_init(&sp->ch[IDX_PAP], 1);
4528 callout_init(&sp->pap_my_to_ch, 1);
4529 }
4530
4531 static void
sppp_pap_open(struct sppp * sp)4532 sppp_pap_open(struct sppp *sp)
4533 {
4534 if (sp->hisauth.proto == PPP_PAP &&
4535 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4536 /* we are authenticator for PAP, start our timer */
4537 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4538 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4539 }
4540 if (sp->myauth.proto == PPP_PAP) {
4541 /* we are peer, send a request, and start a timer */
4542 pap.scr(sp);
4543 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4544 sppp_pap_my_TO, (void *)sp);
4545 }
4546 }
4547
4548 static void
sppp_pap_close(struct sppp * sp)4549 sppp_pap_close(struct sppp *sp)
4550 {
4551 if (sp->state[IDX_PAP] != STATE_CLOSED)
4552 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4553 }
4554
4555 /*
4556 * That's the timeout routine if we are authenticator. Since the
4557 * authenticator is basically passive in PAP, we can't do much here.
4558 */
4559 static void
sppp_pap_TO(void * cookie)4560 sppp_pap_TO(void *cookie)
4561 {
4562 struct sppp *sp = (struct sppp *)cookie;
4563 STDDCL;
4564
4565 SPPP_LOCK(sp);
4566 if (debug)
4567 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4568 SPP_ARGS(ifp),
4569 sppp_state_name(sp->state[IDX_PAP]),
4570 sp->rst_counter[IDX_PAP]);
4571
4572 if (--sp->rst_counter[IDX_PAP] < 0)
4573 /* TO- event */
4574 switch (sp->state[IDX_PAP]) {
4575 case STATE_REQ_SENT:
4576 pap.tld(sp);
4577 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4578 break;
4579 }
4580 else
4581 /* TO+ event, not very much we could do */
4582 switch (sp->state[IDX_PAP]) {
4583 case STATE_REQ_SENT:
4584 /* sppp_cp_change_state() will restart the timer */
4585 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4586 break;
4587 }
4588
4589 SPPP_UNLOCK(sp);
4590 }
4591
4592 /*
4593 * That's the timeout handler if we are peer. Since the peer is active,
4594 * we need to retransmit our PAP request since it is apparently lost.
4595 * XXX We should impose a max counter.
4596 */
4597 static void
sppp_pap_my_TO(void * cookie)4598 sppp_pap_my_TO(void *cookie)
4599 {
4600 struct sppp *sp = (struct sppp *)cookie;
4601 STDDCL;
4602
4603 if (debug)
4604 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4605 SPP_ARGS(ifp));
4606
4607 SPPP_LOCK(sp);
4608 pap.scr(sp);
4609 SPPP_UNLOCK(sp);
4610 }
4611
4612 static void
sppp_pap_tlu(struct sppp * sp)4613 sppp_pap_tlu(struct sppp *sp)
4614 {
4615 STDDCL;
4616
4617 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4618
4619 if (debug)
4620 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4621 SPP_ARGS(ifp), pap.name);
4622
4623 SPPP_LOCK(sp);
4624 /* indicate to LCP that we need to be closed down */
4625 sp->lcp.protos |= (1 << IDX_PAP);
4626
4627 if (sp->pp_flags & PP_NEEDAUTH) {
4628 /*
4629 * Remote is authenticator, but his auth proto didn't
4630 * complete yet. Defer the transition to network
4631 * phase.
4632 */
4633 SPPP_UNLOCK(sp);
4634 return;
4635 }
4636 SPPP_UNLOCK(sp);
4637 sppp_phase_network(sp);
4638 }
4639
4640 static void
sppp_pap_tld(struct sppp * sp)4641 sppp_pap_tld(struct sppp *sp)
4642 {
4643 STDDCL;
4644
4645 if (debug)
4646 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4647 callout_stop (&sp->ch[IDX_PAP]);
4648 callout_stop (&sp->pap_my_to_ch);
4649 sp->lcp.protos &= ~(1 << IDX_PAP);
4650
4651 lcp.Close(sp);
4652 }
4653
4654 static void
sppp_pap_scr(struct sppp * sp)4655 sppp_pap_scr(struct sppp *sp)
4656 {
4657 u_char idlen, pwdlen;
4658
4659 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4660 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4661 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4662
4663 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4664 sizeof idlen, (const char *)&idlen,
4665 (size_t)idlen, sp->myauth.name,
4666 sizeof pwdlen, (const char *)&pwdlen,
4667 (size_t)pwdlen, sp->myauth.secret,
4668 0);
4669 }
4670
4671 /*
4672 * Random miscellaneous functions.
4673 */
4674
4675 /*
4676 * Send a PAP or CHAP proto packet.
4677 *
4678 * Varadic function, each of the elements for the ellipsis is of type
4679 * ``size_t mlen, const u_char *msg''. Processing will stop iff
4680 * mlen == 0.
4681 * NOTE: never declare variadic functions with types subject to type
4682 * promotion (i.e. u_char). This is asking for big trouble depending
4683 * on the architecture you are on...
4684 */
4685
4686 static void
sppp_auth_send(const struct cp * cp,struct sppp * sp,unsigned int type,unsigned int id,...)4687 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4688 unsigned int type, unsigned int id,
4689 ...)
4690 {
4691 STDDCL;
4692 struct ppp_header *h;
4693 struct lcp_header *lh;
4694 struct mbuf *m;
4695 u_char *p;
4696 int len;
4697 unsigned int mlen;
4698 const char *msg;
4699 va_list ap;
4700
4701 MGETHDR (m, M_NOWAIT, MT_DATA);
4702 if (! m)
4703 return;
4704 m->m_pkthdr.rcvif = 0;
4705
4706 h = mtod (m, struct ppp_header*);
4707 h->address = PPP_ALLSTATIONS; /* broadcast address */
4708 h->control = PPP_UI; /* Unnumbered Info */
4709 h->protocol = htons(cp->proto);
4710
4711 lh = (struct lcp_header*)(h + 1);
4712 lh->type = type;
4713 lh->ident = id;
4714 p = (u_char*) (lh+1);
4715
4716 va_start(ap, id);
4717 len = 0;
4718
4719 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4720 msg = va_arg(ap, const char *);
4721 len += mlen;
4722 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4723 va_end(ap);
4724 m_freem(m);
4725 return;
4726 }
4727
4728 bcopy(msg, p, mlen);
4729 p += mlen;
4730 }
4731 va_end(ap);
4732
4733 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4734 lh->len = htons (LCP_HEADER_LEN + len);
4735
4736 if (debug) {
4737 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4738 SPP_ARGS(ifp), cp->name,
4739 sppp_auth_type_name(cp->proto, lh->type),
4740 lh->ident, ntohs(lh->len));
4741 sppp_print_bytes((u_char*) (lh+1), len);
4742 log(-1, ">\n");
4743 }
4744 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4745 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4746 }
4747
4748 /*
4749 * Flush interface queue.
4750 */
4751 static void
sppp_qflush(struct ifqueue * ifq)4752 sppp_qflush(struct ifqueue *ifq)
4753 {
4754 struct mbuf *m, *n;
4755
4756 n = ifq->ifq_head;
4757 while ((m = n)) {
4758 n = m->m_nextpkt;
4759 m_freem (m);
4760 }
4761 ifq->ifq_head = 0;
4762 ifq->ifq_tail = 0;
4763 ifq->ifq_len = 0;
4764 }
4765
4766 /*
4767 * Send keepalive packets, every 10 seconds.
4768 */
4769 static void
sppp_keepalive(void * dummy)4770 sppp_keepalive(void *dummy)
4771 {
4772 struct sppp *sp = (struct sppp*)dummy;
4773 struct ifnet *ifp = SP2IFP(sp);
4774
4775 SPPP_LOCK(sp);
4776 /* Keepalive mode disabled or channel down? */
4777 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4778 ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4779 goto out;
4780
4781 if (sp->pp_mode == PP_FR) {
4782 sppp_fr_keepalive (sp);
4783 goto out;
4784 }
4785
4786 /* No keepalive in PPP mode if LCP not opened yet. */
4787 if (sp->pp_mode != IFF_CISCO &&
4788 sp->pp_phase < PHASE_AUTHENTICATE)
4789 goto out;
4790
4791 if (sp->pp_alivecnt == MAXALIVECNT) {
4792 /* No keepalive packets got. Stop the interface. */
4793 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4794 if_down (ifp);
4795 sppp_qflush (&sp->pp_cpq);
4796 if (sp->pp_mode != IFF_CISCO) {
4797 /* XXX */
4798 /* Shut down the PPP link. */
4799 lcp.Down(sp);
4800 /* Initiate negotiation. XXX */
4801 lcp.Up(sp);
4802 }
4803 }
4804 if (sp->pp_alivecnt <= MAXALIVECNT)
4805 ++sp->pp_alivecnt;
4806 if (sp->pp_mode == IFF_CISCO)
4807 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4808 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4809 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4810 long nmagic = htonl (sp->lcp.magic);
4811 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4812 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4813 sp->lcp.echoid, 4, &nmagic);
4814 }
4815 out:
4816 SPPP_UNLOCK(sp);
4817 callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4818 (void *)sp);
4819 }
4820
4821 /*
4822 * Get both IP addresses.
4823 */
4824 void
sppp_get_ip_addrs(struct sppp * sp,u_long * src,u_long * dst,u_long * srcmask)4825 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4826 {
4827 struct ifnet *ifp = SP2IFP(sp);
4828 struct ifaddr *ifa;
4829 struct sockaddr_in *si, *sm;
4830 u_long ssrc, ddst;
4831
4832 sm = NULL;
4833 ssrc = ddst = 0L;
4834 /*
4835 * Pick the first AF_INET address from the list,
4836 * aliases don't make any sense on a p2p link anyway.
4837 */
4838 si = 0;
4839 if_addr_rlock(ifp);
4840 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4841 if (ifa->ifa_addr->sa_family == AF_INET) {
4842 si = (struct sockaddr_in *)ifa->ifa_addr;
4843 sm = (struct sockaddr_in *)ifa->ifa_netmask;
4844 if (si)
4845 break;
4846 }
4847 if (ifa) {
4848 if (si && si->sin_addr.s_addr) {
4849 ssrc = si->sin_addr.s_addr;
4850 if (srcmask)
4851 *srcmask = ntohl(sm->sin_addr.s_addr);
4852 }
4853
4854 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4855 if (si && si->sin_addr.s_addr)
4856 ddst = si->sin_addr.s_addr;
4857 }
4858 if_addr_runlock(ifp);
4859
4860 if (dst) *dst = ntohl(ddst);
4861 if (src) *src = ntohl(ssrc);
4862 }
4863
4864 #ifdef INET
4865 /*
4866 * Set my IP address.
4867 */
4868 static void
sppp_set_ip_addr(struct sppp * sp,u_long src)4869 sppp_set_ip_addr(struct sppp *sp, u_long src)
4870 {
4871 STDDCL;
4872 struct ifaddr *ifa;
4873 struct sockaddr_in *si;
4874 struct in_ifaddr *ia;
4875
4876 /*
4877 * Pick the first AF_INET address from the list,
4878 * aliases don't make any sense on a p2p link anyway.
4879 */
4880 si = 0;
4881 if_addr_rlock(ifp);
4882 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4883 if (ifa->ifa_addr->sa_family == AF_INET) {
4884 si = (struct sockaddr_in *)ifa->ifa_addr;
4885 if (si != NULL) {
4886 ifa_ref(ifa);
4887 break;
4888 }
4889 }
4890 }
4891 if_addr_runlock(ifp);
4892
4893 if (ifa != NULL) {
4894 int error;
4895
4896 /* delete old route */
4897 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4898 if (debug && error) {
4899 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4900 SPP_ARGS(ifp), error);
4901 }
4902
4903 /* set new address */
4904 si->sin_addr.s_addr = htonl(src);
4905 ia = ifatoia(ifa);
4906 IN_IFADDR_WLOCK();
4907 LIST_REMOVE(ia, ia_hash);
4908 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4909 IN_IFADDR_WUNLOCK();
4910
4911 /* add new route */
4912 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4913 if (debug && error) {
4914 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4915 SPP_ARGS(ifp), error);
4916 }
4917 ifa_free(ifa);
4918 }
4919 }
4920 #endif
4921
4922 #ifdef INET6
4923 /*
4924 * Get both IPv6 addresses.
4925 */
4926 static void
sppp_get_ip6_addrs(struct sppp * sp,struct in6_addr * src,struct in6_addr * dst,struct in6_addr * srcmask)4927 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4928 struct in6_addr *srcmask)
4929 {
4930 struct ifnet *ifp = SP2IFP(sp);
4931 struct ifaddr *ifa;
4932 struct sockaddr_in6 *si, *sm;
4933 struct in6_addr ssrc, ddst;
4934
4935 sm = NULL;
4936 bzero(&ssrc, sizeof(ssrc));
4937 bzero(&ddst, sizeof(ddst));
4938 /*
4939 * Pick the first link-local AF_INET6 address from the list,
4940 * aliases don't make any sense on a p2p link anyway.
4941 */
4942 si = NULL;
4943 if_addr_rlock(ifp);
4944 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4945 if (ifa->ifa_addr->sa_family == AF_INET6) {
4946 si = (struct sockaddr_in6 *)ifa->ifa_addr;
4947 sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4948 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4949 break;
4950 }
4951 if (ifa) {
4952 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4953 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4954 if (srcmask) {
4955 bcopy(&sm->sin6_addr, srcmask,
4956 sizeof(*srcmask));
4957 }
4958 }
4959
4960 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4961 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4962 bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4963 }
4964
4965 if (dst)
4966 bcopy(&ddst, dst, sizeof(*dst));
4967 if (src)
4968 bcopy(&ssrc, src, sizeof(*src));
4969 if_addr_runlock(ifp);
4970 }
4971
4972 #ifdef IPV6CP_MYIFID_DYN
4973 /*
4974 * Generate random ifid.
4975 */
4976 static void
sppp_gen_ip6_addr(struct sppp * sp,struct in6_addr * addr)4977 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4978 {
4979 /* TBD */
4980 }
4981
4982 /*
4983 * Set my IPv6 address.
4984 */
4985 static void
sppp_set_ip6_addr(struct sppp * sp,const struct in6_addr * src)4986 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4987 {
4988 STDDCL;
4989 struct ifaddr *ifa;
4990 struct sockaddr_in6 *sin6;
4991
4992 /*
4993 * Pick the first link-local AF_INET6 address from the list,
4994 * aliases don't make any sense on a p2p link anyway.
4995 */
4996
4997 sin6 = NULL;
4998 if_addr_rlock(ifp);
4999 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
5000 if (ifa->ifa_addr->sa_family == AF_INET6) {
5001 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5002 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5003 ifa_ref(ifa);
5004 break;
5005 }
5006 }
5007 }
5008 if_addr_runlock(ifp);
5009
5010 if (ifa != NULL) {
5011 int error;
5012 struct sockaddr_in6 new_sin6 = *sin6;
5013
5014 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5015 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5016 if (debug && error) {
5017 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5018 " failed, error=%d\n", SPP_ARGS(ifp), error);
5019 }
5020 ifa_free(ifa);
5021 }
5022 }
5023 #endif
5024
5025 /*
5026 * Suggest a candidate address to be used by peer.
5027 */
5028 static void
sppp_suggest_ip6_addr(struct sppp * sp,struct in6_addr * suggest)5029 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5030 {
5031 struct in6_addr myaddr;
5032 struct timeval tv;
5033
5034 sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5035
5036 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */
5037 microtime(&tv);
5038 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5039 myaddr.s6_addr[14] ^= 0xff;
5040 myaddr.s6_addr[15] ^= 0xff;
5041 } else {
5042 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5043 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5044 }
5045 if (suggest)
5046 bcopy(&myaddr, suggest, sizeof(myaddr));
5047 }
5048 #endif /*INET6*/
5049
5050 static int
sppp_params(struct sppp * sp,u_long cmd,void * data)5051 sppp_params(struct sppp *sp, u_long cmd, void *data)
5052 {
5053 u_long subcmd;
5054 struct ifreq *ifr = (struct ifreq *)data;
5055 struct spppreq *spr;
5056 int rv = 0;
5057
5058 if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == 0)
5059 return (EAGAIN);
5060 /*
5061 * ifr->ifr_data is supposed to point to a struct spppreq.
5062 * Check the cmd word first before attempting to fetch all the
5063 * data.
5064 */
5065 rv = fueword(ifr->ifr_data, &subcmd);
5066 if (rv == -1) {
5067 rv = EFAULT;
5068 goto quit;
5069 }
5070
5071 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5072 rv = EFAULT;
5073 goto quit;
5074 }
5075
5076 switch (subcmd) {
5077 case (u_long)SPPPIOGDEFS:
5078 if (cmd != SIOCGIFGENERIC) {
5079 rv = EINVAL;
5080 break;
5081 }
5082 /*
5083 * We copy over the entire current state, but clean
5084 * out some of the stuff we don't wanna pass up.
5085 * Remember, SIOCGIFGENERIC is unprotected, and can be
5086 * called by any user. No need to ever get PAP or
5087 * CHAP secrets back to userland anyway.
5088 */
5089 spr->defs.pp_phase = sp->pp_phase;
5090 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5091 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5092 spr->defs.lcp = sp->lcp;
5093 spr->defs.ipcp = sp->ipcp;
5094 spr->defs.ipv6cp = sp->ipv6cp;
5095 spr->defs.myauth = sp->myauth;
5096 spr->defs.hisauth = sp->hisauth;
5097 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5098 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5099 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5100 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5101 /*
5102 * Fixup the LCP timeout value to milliseconds so
5103 * spppcontrol doesn't need to bother about the value
5104 * of "hz". We do the reverse calculation below when
5105 * setting it.
5106 */
5107 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5108 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5109 sizeof(struct spppreq));
5110 break;
5111
5112 case (u_long)SPPPIOSDEFS:
5113 if (cmd != SIOCSIFGENERIC) {
5114 rv = EINVAL;
5115 break;
5116 }
5117 /*
5118 * We have a very specific idea of which fields we
5119 * allow being passed back from userland, so to not
5120 * clobber our current state. For one, we only allow
5121 * setting anything if LCP is in dead or establish
5122 * phase. Once the authentication negotiations
5123 * started, the authentication settings must not be
5124 * changed again. (The administrator can force an
5125 * ifconfig down in order to get LCP back into dead
5126 * phase.)
5127 *
5128 * Also, we only allow for authentication parameters to be
5129 * specified.
5130 *
5131 * XXX Should allow to set or clear pp_flags.
5132 *
5133 * Finally, if the respective authentication protocol to
5134 * be used is set differently than 0, but the secret is
5135 * passed as all zeros, we don't trash the existing secret.
5136 * This allows an administrator to change the system name
5137 * only without clobbering the secret (which he didn't get
5138 * back in a previous SPPPIOGDEFS call). However, the
5139 * secrets are cleared if the authentication protocol is
5140 * reset to 0. */
5141 if (sp->pp_phase != PHASE_DEAD &&
5142 sp->pp_phase != PHASE_ESTABLISH) {
5143 rv = EBUSY;
5144 break;
5145 }
5146
5147 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5148 spr->defs.myauth.proto != PPP_CHAP) ||
5149 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5150 spr->defs.hisauth.proto != PPP_CHAP)) {
5151 rv = EINVAL;
5152 break;
5153 }
5154
5155 if (spr->defs.myauth.proto == 0)
5156 /* resetting myauth */
5157 bzero(&sp->myauth, sizeof sp->myauth);
5158 else {
5159 /* setting/changing myauth */
5160 sp->myauth.proto = spr->defs.myauth.proto;
5161 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5162 if (spr->defs.myauth.secret[0] != '\0')
5163 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5164 AUTHKEYLEN);
5165 }
5166 if (spr->defs.hisauth.proto == 0)
5167 /* resetting hisauth */
5168 bzero(&sp->hisauth, sizeof sp->hisauth);
5169 else {
5170 /* setting/changing hisauth */
5171 sp->hisauth.proto = spr->defs.hisauth.proto;
5172 sp->hisauth.flags = spr->defs.hisauth.flags;
5173 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5174 if (spr->defs.hisauth.secret[0] != '\0')
5175 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5176 AUTHKEYLEN);
5177 }
5178 /* set LCP restart timer timeout */
5179 if (spr->defs.lcp.timeout != 0)
5180 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5181 /* set VJ enable and IPv6 disable flags */
5182 #ifdef INET
5183 if (spr->defs.enable_vj)
5184 sp->confflags |= CONF_ENABLE_VJ;
5185 else
5186 sp->confflags &= ~CONF_ENABLE_VJ;
5187 #endif
5188 #ifdef INET6
5189 if (spr->defs.enable_ipv6)
5190 sp->confflags |= CONF_ENABLE_IPV6;
5191 else
5192 sp->confflags &= ~CONF_ENABLE_IPV6;
5193 #endif
5194 break;
5195
5196 default:
5197 rv = EINVAL;
5198 }
5199
5200 quit:
5201 free(spr, M_TEMP);
5202
5203 return (rv);
5204 }
5205
5206 static void
sppp_phase_network(struct sppp * sp)5207 sppp_phase_network(struct sppp *sp)
5208 {
5209 STDDCL;
5210 int i;
5211 u_long mask;
5212
5213 sp->pp_phase = PHASE_NETWORK;
5214
5215 if (debug)
5216 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5217 sppp_phase_name(sp->pp_phase));
5218
5219 /* Notify NCPs now. */
5220 for (i = 0; i < IDX_COUNT; i++)
5221 if ((cps[i])->flags & CP_NCP)
5222 (cps[i])->Open(sp);
5223
5224 /* Send Up events to all NCPs. */
5225 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5226 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5227 (cps[i])->Up(sp);
5228
5229 /* if no NCP is starting, all this was in vain, close down */
5230 sppp_lcp_check_and_close(sp);
5231 }
5232
5233
5234 static const char *
sppp_cp_type_name(u_char type)5235 sppp_cp_type_name(u_char type)
5236 {
5237 static char buf[12];
5238 switch (type) {
5239 case CONF_REQ: return "conf-req";
5240 case CONF_ACK: return "conf-ack";
5241 case CONF_NAK: return "conf-nak";
5242 case CONF_REJ: return "conf-rej";
5243 case TERM_REQ: return "term-req";
5244 case TERM_ACK: return "term-ack";
5245 case CODE_REJ: return "code-rej";
5246 case PROTO_REJ: return "proto-rej";
5247 case ECHO_REQ: return "echo-req";
5248 case ECHO_REPLY: return "echo-reply";
5249 case DISC_REQ: return "discard-req";
5250 }
5251 snprintf (buf, sizeof(buf), "cp/0x%x", type);
5252 return buf;
5253 }
5254
5255 static const char *
sppp_auth_type_name(u_short proto,u_char type)5256 sppp_auth_type_name(u_short proto, u_char type)
5257 {
5258 static char buf[12];
5259 switch (proto) {
5260 case PPP_CHAP:
5261 switch (type) {
5262 case CHAP_CHALLENGE: return "challenge";
5263 case CHAP_RESPONSE: return "response";
5264 case CHAP_SUCCESS: return "success";
5265 case CHAP_FAILURE: return "failure";
5266 }
5267 case PPP_PAP:
5268 switch (type) {
5269 case PAP_REQ: return "req";
5270 case PAP_ACK: return "ack";
5271 case PAP_NAK: return "nak";
5272 }
5273 }
5274 snprintf (buf, sizeof(buf), "auth/0x%x", type);
5275 return buf;
5276 }
5277
5278 static const char *
sppp_lcp_opt_name(u_char opt)5279 sppp_lcp_opt_name(u_char opt)
5280 {
5281 static char buf[12];
5282 switch (opt) {
5283 case LCP_OPT_MRU: return "mru";
5284 case LCP_OPT_ASYNC_MAP: return "async-map";
5285 case LCP_OPT_AUTH_PROTO: return "auth-proto";
5286 case LCP_OPT_QUAL_PROTO: return "qual-proto";
5287 case LCP_OPT_MAGIC: return "magic";
5288 case LCP_OPT_PROTO_COMP: return "proto-comp";
5289 case LCP_OPT_ADDR_COMP: return "addr-comp";
5290 }
5291 snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5292 return buf;
5293 }
5294
5295 #ifdef INET
5296 static const char *
sppp_ipcp_opt_name(u_char opt)5297 sppp_ipcp_opt_name(u_char opt)
5298 {
5299 static char buf[12];
5300 switch (opt) {
5301 case IPCP_OPT_ADDRESSES: return "addresses";
5302 case IPCP_OPT_COMPRESSION: return "compression";
5303 case IPCP_OPT_ADDRESS: return "address";
5304 }
5305 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5306 return buf;
5307 }
5308 #endif
5309
5310 #ifdef INET6
5311 static const char *
sppp_ipv6cp_opt_name(u_char opt)5312 sppp_ipv6cp_opt_name(u_char opt)
5313 {
5314 static char buf[12];
5315 switch (opt) {
5316 case IPV6CP_OPT_IFID: return "ifid";
5317 case IPV6CP_OPT_COMPRESSION: return "compression";
5318 }
5319 sprintf (buf, "0x%x", opt);
5320 return buf;
5321 }
5322 #endif
5323
5324 static const char *
sppp_state_name(int state)5325 sppp_state_name(int state)
5326 {
5327 switch (state) {
5328 case STATE_INITIAL: return "initial";
5329 case STATE_STARTING: return "starting";
5330 case STATE_CLOSED: return "closed";
5331 case STATE_STOPPED: return "stopped";
5332 case STATE_CLOSING: return "closing";
5333 case STATE_STOPPING: return "stopping";
5334 case STATE_REQ_SENT: return "req-sent";
5335 case STATE_ACK_RCVD: return "ack-rcvd";
5336 case STATE_ACK_SENT: return "ack-sent";
5337 case STATE_OPENED: return "opened";
5338 }
5339 return "illegal";
5340 }
5341
5342 static const char *
sppp_phase_name(enum ppp_phase phase)5343 sppp_phase_name(enum ppp_phase phase)
5344 {
5345 switch (phase) {
5346 case PHASE_DEAD: return "dead";
5347 case PHASE_ESTABLISH: return "establish";
5348 case PHASE_TERMINATE: return "terminate";
5349 case PHASE_AUTHENTICATE: return "authenticate";
5350 case PHASE_NETWORK: return "network";
5351 }
5352 return "illegal";
5353 }
5354
5355 static const char *
sppp_proto_name(u_short proto)5356 sppp_proto_name(u_short proto)
5357 {
5358 static char buf[12];
5359 switch (proto) {
5360 case PPP_LCP: return "lcp";
5361 case PPP_IPCP: return "ipcp";
5362 case PPP_PAP: return "pap";
5363 case PPP_CHAP: return "chap";
5364 case PPP_IPV6CP: return "ipv6cp";
5365 }
5366 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5367 return buf;
5368 }
5369
5370 static void
sppp_print_bytes(const u_char * p,u_short len)5371 sppp_print_bytes(const u_char *p, u_short len)
5372 {
5373 if (len)
5374 log(-1, " %*D", len, p, "-");
5375 }
5376
5377 static void
sppp_print_string(const char * p,u_short len)5378 sppp_print_string(const char *p, u_short len)
5379 {
5380 u_char c;
5381
5382 while (len-- > 0) {
5383 c = *p++;
5384 /*
5385 * Print only ASCII chars directly. RFC 1994 recommends
5386 * using only them, but we don't rely on it. */
5387 if (c < ' ' || c > '~')
5388 log(-1, "\\x%x", c);
5389 else
5390 log(-1, "%c", c);
5391 }
5392 }
5393
5394 #ifdef INET
5395 static const char *
sppp_dotted_quad(u_long addr)5396 sppp_dotted_quad(u_long addr)
5397 {
5398 static char s[16];
5399 sprintf(s, "%d.%d.%d.%d",
5400 (int)((addr >> 24) & 0xff),
5401 (int)((addr >> 16) & 0xff),
5402 (int)((addr >> 8) & 0xff),
5403 (int)(addr & 0xff));
5404 return s;
5405 }
5406 #endif
5407
5408 static int
sppp_strnlen(u_char * p,int max)5409 sppp_strnlen(u_char *p, int max)
5410 {
5411 int len;
5412
5413 for (len = 0; len < max && *p; ++p)
5414 ++len;
5415 return len;
5416 }
5417
5418 /* a dummy, used to drop uninteresting events */
5419 static void
sppp_null(struct sppp * unused)5420 sppp_null(struct sppp *unused)
5421 {
5422 /* do just nothing */
5423 }
5424