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[dragonfly.git] / usr.sbin / ppp / ipcp.c
blob1186af9f74e35119efea80b11b088d103ee6b3e0
1 /*-
2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/usr.sbin/ppp/ipcp.c,v 1.90.2.12 2002/09/28 10:16:25 brian Exp $
29 * $DragonFly: src/usr.sbin/ppp/ipcp.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
30 */
31
32 #include <sys/param.h>
33 #include <netinet/in_systm.h>
34 #include <netinet/in.h>
35 #include <netinet/ip.h>
36 #include <arpa/inet.h>
37 #include <sys/socket.h>
38 #include <net/if.h>
39 #include <net/route.h>
40 #include <netdb.h>
41 #include <sys/un.h>
42
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <resolv.h>
46 #include <stdarg.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <sys/stat.h>
50 #include <termios.h>
51 #include <unistd.h>
52
53 #ifndef NONAT
54 #ifdef LOCALNAT
55 #include "alias.h"
56 #else
57 #include <alias.h>
58 #endif
59 #endif
60
61 #include "layer.h"
62 #include "ua.h"
63 #include "defs.h"
64 #include "command.h"
65 #include "mbuf.h"
66 #include "log.h"
67 #include "timer.h"
68 #include "fsm.h"
69 #include "proto.h"
70 #include "iplist.h"
71 #include "throughput.h"
72 #include "slcompress.h"
73 #include "lqr.h"
74 #include "hdlc.h"
75 #include "lcp.h"
76 #include "ncpaddr.h"
77 #include "ip.h"
78 #include "ipcp.h"
79 #include "filter.h"
80 #include "descriptor.h"
81 #include "vjcomp.h"
82 #include "async.h"
83 #include "ccp.h"
84 #include "link.h"
85 #include "physical.h"
86 #include "mp.h"
87 #ifndef NORADIUS
88 #include "radius.h"
89 #endif
90 #include "ipv6cp.h"
91 #include "ncp.h"
92 #include "bundle.h"
93 #include "id.h"
94 #include "arp.h"
95 #include "systems.h"
96 #include "prompt.h"
97 #include "route.h"
98 #include "iface.h"
99
100 #undef REJECTED
101 #define REJECTED(p, x) ((p)->peer_reject & (1<<(x)))
102 #define issep(ch) ((ch) == ' ' || (ch) == '\t')
103 #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.')
104
105 struct compreq {
106 u_short proto;
107 u_char slots;
108 u_char compcid;
109 };
110
111 static int IpcpLayerUp(struct fsm *);
112 static void IpcpLayerDown(struct fsm *);
113 static void IpcpLayerStart(struct fsm *);
114 static void IpcpLayerFinish(struct fsm *);
115 static void IpcpInitRestartCounter(struct fsm *, int);
116 static void IpcpSendConfigReq(struct fsm *);
117 static void IpcpSentTerminateReq(struct fsm *);
118 static void IpcpSendTerminateAck(struct fsm *, u_char);
119 static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
120 struct fsm_decode *);
121
122 static struct fsm_callbacks ipcp_Callbacks = {
123 IpcpLayerUp,
124 IpcpLayerDown,
125 IpcpLayerStart,
126 IpcpLayerFinish,
127 IpcpInitRestartCounter,
128 IpcpSendConfigReq,
129 IpcpSentTerminateReq,
130 IpcpSendTerminateAck,
131 IpcpDecodeConfig,
132 fsm_NullRecvResetReq,
133 fsm_NullRecvResetAck
134 };
135
136 static const char *
137 protoname(int proto)
138 {
139 static struct {
140 int id;
141 const char *txt;
142 } cftypes[] = {
143 /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
144 { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */
145 { 2, "COMPPROTO" }, /* IP-Compression-Protocol */
146 { 3, "IPADDR" }, /* IP-Address */
147 { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */
148 { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */
149 { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */
150 { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */
151 };
152 int f;
153
154 for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++)
155 if (cftypes[f].id == proto)
156 return cftypes[f].txt;
157
158 return NumStr(proto, NULL, 0);
159 }
160
161 void
162 ipcp_AddInOctets(struct ipcp *ipcp, int n)
163 {
164 throughput_addin(&ipcp->throughput, n);
165 }
166
167 void
168 ipcp_AddOutOctets(struct ipcp *ipcp, int n)
169 {
170 throughput_addout(&ipcp->throughput, n);
171 }
172
173 void
174 ipcp_LoadDNS(struct ipcp *ipcp)
175 {
176 int fd;
177
178 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE;
179
180 if (ipcp->ns.resolv != NULL) {
181 free(ipcp->ns.resolv);
182 ipcp->ns.resolv = NULL;
183 }
184 if (ipcp->ns.resolv_nons != NULL) {
185 free(ipcp->ns.resolv_nons);
186 ipcp->ns.resolv_nons = NULL;
187 }
188 ipcp->ns.resolver = 0;
189
190 if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) {
191 struct stat st;
192
193 if (fstat(fd, &st) == 0) {
194 ssize_t got;
195
196 if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL)
197 log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n",
198 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
199 else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) {
200 log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n",
201 (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
202 free(ipcp->ns.resolv_nons);
203 ipcp->ns.resolv_nons = NULL;
204 } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) {
205 if (got == -1)
206 log_Printf(LogERROR, "Failed to read %s: %s\n",
207 _PATH_RESCONF, strerror(errno));
208 else
209 log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n",
210 _PATH_RESCONF, (unsigned long)got,
211 (unsigned long)st.st_size);
212 free(ipcp->ns.resolv_nons);
213 ipcp->ns.resolv_nons = NULL;
214 free(ipcp->ns.resolv);
215 ipcp->ns.resolv = NULL;
216 } else {
217 char *cp, *cp_nons, *ncp, ch;
218 int n;
219
220 ipcp->ns.resolv[st.st_size] = '\0';
221 ipcp->ns.resolver = 1;
222
223 cp_nons = ipcp->ns.resolv_nons;
224 cp = ipcp->ns.resolv;
225 n = 0;
226
227 while ((ncp = strstr(cp, "nameserver")) != NULL) {
228 if (ncp != cp) {
229 memcpy(cp_nons, cp, ncp - cp);
230 cp_nons += ncp - cp;
231 }
232 if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) {
233 memcpy(cp_nons, ncp, 9);
234 cp_nons += 9;
235 cp = ncp + 9; /* Can't match "nameserver" at cp... */
236 continue;
237 }
238
239 for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */
240 ;
241
242 for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */
243 ;
244
245 ch = *ncp;
246 *ncp = '\0';
247 if (n < 2 && inet_aton(cp, ipcp->ns.dns))
248 n++;
249 *ncp = ch;
250
251 if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */
252 cp = ncp + strlen(ncp);
253 else
254 cp++;
255 }
256 strcpy(cp_nons, cp); /* Copy the end - including the NUL */
257 cp_nons += strlen(cp_nons) - 1;
258 while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n')
259 *cp_nons-- = '\0';
260 if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) {
261 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
262 ipcp->ns.dns[1].s_addr = INADDR_ANY;
263 }
264 bundle_AdjustDNS(ipcp->fsm.bundle);
265 }
266 } else
267 log_Printf(LogERROR, "Failed to stat opened %s: %s\n",
268 _PATH_RESCONF, strerror(errno));
269
270 close(fd);
271 }
272 }
273
274 int
275 ipcp_WriteDNS(struct ipcp *ipcp)
276 {
277 const char *paddr;
278 mode_t mask;
279 FILE *fp;
280
281 if (ipcp->ns.dns[0].s_addr == INADDR_ANY &&
282 ipcp->ns.dns[1].s_addr == INADDR_ANY) {
283 log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n",
284 _PATH_RESCONF);
285 return 0;
286 }
287
288 if (ipcp->ns.dns[0].s_addr == INADDR_ANY) {
289 ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
290 ipcp->ns.dns[1].s_addr = INADDR_ANY;
291 }
292
293 mask = umask(022);
294 if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) {
295 umask(mask);
296 if (ipcp->ns.resolv_nons)
297 fputs(ipcp->ns.resolv_nons, fp);
298 paddr = inet_ntoa(ipcp->ns.dns[0]);
299 log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr);
300 fprintf(fp, "\nnameserver %s\n", paddr);
301 if (ipcp->ns.dns[1].s_addr != INADDR_ANY &&
302 ipcp->ns.dns[1].s_addr != INADDR_NONE &&
303 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) {
304 paddr = inet_ntoa(ipcp->ns.dns[1]);
305 log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr);
306 fprintf(fp, "nameserver %s\n", paddr);
307 }
308 if (fclose(fp) == EOF) {
309 log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF,
310 strerror(errno));
311 return 0;
312 }
313 } else
314 umask(mask);
315
316 return 1;
317 }
318
319 void
320 ipcp_RestoreDNS(struct ipcp *ipcp)
321 {
322 if (ipcp->ns.resolver) {
323 ssize_t got;
324 size_t len;
325 int fd;
326
327 if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) {
328 len = strlen(ipcp->ns.resolv);
329 if ((got = write(fd, ipcp->ns.resolv, len)) != len) {
330 if (got == -1)
331 log_Printf(LogERROR, "Failed rewriting %s: write: %s\n",
332 _PATH_RESCONF, strerror(errno));
333 else
334 log_Printf(LogERROR, "Failed rewriting %s: wrote %lu of %lu\n",
335 _PATH_RESCONF, (unsigned long)got, (unsigned long)len);
336 }
337 close(fd);
338 } else
339 log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF,
340 strerror(errno));
341 } else if (remove(_PATH_RESCONF) == -1)
342 log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF,
343 strerror(errno));
344
345 }
346
347 int
348 ipcp_Show(struct cmdargs const *arg)
349 {
350 struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
351
352 prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
353 State2Nam(ipcp->fsm.state));
354 if (ipcp->fsm.state == ST_OPENED) {
355 prompt_Printf(arg->prompt, " His side: %s, %s\n",
356 inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
357 prompt_Printf(arg->prompt, " My side: %s, %s\n",
358 inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
359 prompt_Printf(arg->prompt, " Queued packets: %lu\n",
360 (unsigned long)ipcp_QueueLen(ipcp));
361 }
362
363 prompt_Printf(arg->prompt, "\nDefaults:\n");
364 prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
365 " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
366 ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
367 ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
368 prompt_Printf(arg->prompt, " My Address: %s\n",
369 ncprange_ntoa(&ipcp->cfg.my_range));
370 if (ipcp->cfg.HaveTriggerAddress)
371 prompt_Printf(arg->prompt, " Trigger address: %s\n",
372 inet_ntoa(ipcp->cfg.TriggerAddress));
373
374 prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot "
375 "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
376 ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
377
378 if (iplist_isvalid(&ipcp->cfg.peer_list))
379 prompt_Printf(arg->prompt, " His Address: %s\n",
380 ipcp->cfg.peer_list.src);
381 else
382 prompt_Printf(arg->prompt, " His Address: %s\n",
383 ncprange_ntoa(&ipcp->cfg.peer_range));
384
385 prompt_Printf(arg->prompt, " DNS: %s",
386 ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ?
387 "none" : inet_ntoa(ipcp->cfg.ns.dns[0]));
388 if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE)
389 prompt_Printf(arg->prompt, ", %s",
390 inet_ntoa(ipcp->cfg.ns.dns[1]));
391 prompt_Printf(arg->prompt, ", %s\n",
392 command_ShowNegval(ipcp->cfg.ns.dns_neg));
393 prompt_Printf(arg->prompt, " Resolver DNS: %s",
394 ipcp->ns.dns[0].s_addr == INADDR_NONE ?
395 "none" : inet_ntoa(ipcp->ns.dns[0]));
396 if (ipcp->ns.dns[1].s_addr != INADDR_NONE &&
397 ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr)
398 prompt_Printf(arg->prompt, ", %s",
399 inet_ntoa(ipcp->ns.dns[1]));
400 prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ",
401 inet_ntoa(ipcp->cfg.ns.nbns[0]));
402 prompt_Printf(arg->prompt, "%s\n\n",
403 inet_ntoa(ipcp->cfg.ns.nbns[1]));
404
405 throughput_disp(&ipcp->throughput, arg->prompt);
406
407 return 0;
408 }
409
410 int
411 ipcp_vjset(struct cmdargs const *arg)
412 {
413 if (arg->argc != arg->argn+2)
414 return -1;
415 if (!strcasecmp(arg->argv[arg->argn], "slots")) {
416 int slots;
417
418 slots = atoi(arg->argv[arg->argn+1]);
419 if (slots < 4 || slots > 16)
420 return 1;
421 arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
422 return 0;
423 } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
424 if (!strcasecmp(arg->argv[arg->argn+1], "on"))
425 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
426 else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
427 arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
428 else
429 return 2;
430 return 0;
431 }
432 return -1;
433 }
434
435 void
436 ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
437 const struct fsm_parent *parent)
438 {
439 struct hostent *hp;
440 struct in_addr host;
441 char name[MAXHOSTNAMELEN];
442 static const char * const timer_names[] =
443 {"IPCP restart", "IPCP openmode", "IPCP stopped"};
444
445 fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
446 bundle, l, parent, &ipcp_Callbacks, timer_names);
447
448 ipcp->cfg.vj.slots = DEF_VJ_STATES;
449 ipcp->cfg.vj.slotcomp = 1;
450 memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
451
452 host.s_addr = htonl(INADDR_LOOPBACK);
453 ipcp->cfg.netmask.s_addr = INADDR_ANY;
454 if (gethostname(name, sizeof name) == 0) {
455 hp = gethostbyname(name);
456 if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr)
457 memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr);
458 }
459 ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask);
460 ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask);
461
462 iplist_setsrc(&ipcp->cfg.peer_list, "");
463 ipcp->cfg.HaveTriggerAddress = 0;
464
465 ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE;
466 ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE;
467 ipcp->cfg.ns.dns_neg = 0;
468 ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
469 ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
470
471 ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
472 ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
473 ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
474 ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
475
476 memset(&ipcp->vj, '\0', sizeof ipcp->vj);
477
478 ipcp->ns.resolv = NULL;
479 ipcp->ns.resolv_nons = NULL;
480 ipcp->ns.writable = 1;
481 ipcp_LoadDNS(ipcp);
482
483 throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
484 memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
485 ipcp_Setup(ipcp, INADDR_NONE);
486 }
487
488 void
489 ipcp_Destroy(struct ipcp *ipcp)
490 {
491 throughput_destroy(&ipcp->throughput);
492
493 if (ipcp->ns.resolv != NULL) {
494 free(ipcp->ns.resolv);
495 ipcp->ns.resolv = NULL;
496 }
497 if (ipcp->ns.resolv_nons != NULL) {
498 free(ipcp->ns.resolv_nons);
499 ipcp->ns.resolv_nons = NULL;
500 }
501 }
502
503 void
504 ipcp_SetLink(struct ipcp *ipcp, struct link *l)
505 {
506 ipcp->fsm.link = l;
507 }
508
509 void
510 ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
511 {
512 struct iface *iface = ipcp->fsm.bundle->iface;
513 struct ncpaddr ipaddr;
514 struct in_addr peer;
515 int pos, n;
516
517 ipcp->fsm.open_mode = 0;
518 ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask;
519
520 if (iplist_isvalid(&ipcp->cfg.peer_list)) {
521 /* Try to give the peer a previously configured IP address */
522 for (n = 0; n < iface->addrs; n++) {
523 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
524 continue;
525 if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) {
526 ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos));
527 break;
528 }
529 }
530 if (n == iface->addrs)
531 /* Ok, so none of 'em fit.... pick a random one */
532 ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list));
533
534 ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr);
535 }
536
537 ipcp->heis1172 = 0;
538 ipcp->peer_req = 0;
539 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
540 ipcp->peer_compproto = 0;
541
542 if (ipcp->cfg.HaveTriggerAddress) {
543 /*
544 * Some implementations of PPP require that we send a
545 * *special* value as our address, even though the rfc specifies
546 * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
547 */
548 ipcp->my_ip = ipcp->cfg.TriggerAddress;
549 log_Printf(LogIPCP, "Using trigger address %s\n",
550 inet_ntoa(ipcp->cfg.TriggerAddress));
551 } else {
552 /*
553 * Otherwise, if we've used an IP number before and it's still within
554 * the network specified on the ``set ifaddr'' line, we really
555 * want to keep that IP number so that we can keep any existing
556 * connections that are bound to that IP.
557 */
558 for (n = 0; n < iface->addrs; n++) {
559 ncprange_getaddr(&iface->addr[n].ifa, &ipaddr);
560 if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) {
561 ncpaddr_getip4(&ipaddr, &ipcp->my_ip);
562 break;
563 }
564 }
565 if (n == iface->addrs)
566 ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip);
567 }
568
569 if (IsEnabled(ipcp->cfg.vj.neg)
570 #ifndef NORADIUS
571 || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj)
572 #endif
573 )
574 ipcp->my_compproto = (PROTO_VJCOMP << 16) +
575 ((ipcp->cfg.vj.slots - 1) << 8) +
576 ipcp->cfg.vj.slotcomp;
577 else
578 ipcp->my_compproto = 0;
579 sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1);
580
581 ipcp->peer_reject = 0;
582 ipcp->my_reject = 0;
583
584 /* Copy startup values into ipcp->ns.dns */
585 if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE)
586 memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns);
587 }
588
589 static int
590 numaddresses(struct in_addr mask)
591 {
592 u_int32_t bit, haddr;
593 int n;
594
595 haddr = ntohl(mask.s_addr);
596 bit = 1;
597 n = 1;
598
599 do {
600 if (!(haddr & bit))
601 n <<= 1;
602 } while (bit <<= 1);
603
604 return n;
605 }
606
607 static int
608 ipcp_proxyarp(struct ipcp *ipcp,
609 int (*proxyfun)(struct bundle *, struct in_addr, int),
610 const struct iface_addr *addr)
611 {
612 struct bundle *bundle = ipcp->fsm.bundle;
613 struct in_addr peer, mask, ip;
614 int n, ret, s;
615
616 if (!ncpaddr_getip4(&addr->peer, &peer)) {
617 log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n");
618 return 0;
619 }
620
621 if ((s = ID0socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
622 log_Printf(LogERROR, "ipcp_proxyarp: socket: %s\n",
623 strerror(errno));
624 return 0;
625 }
626
627 ret = 0;
628
629 if (Enabled(bundle, OPT_PROXYALL)) {
630 ncprange_getip4mask(&addr->ifa, &mask);
631 if ((n = numaddresses(mask)) > 256) {
632 log_Printf(LogWARN, "%s: Too many addresses for proxyall\n",
633 ncprange_ntoa(&addr->ifa));
634 return 0;
635 }
636 ip.s_addr = peer.s_addr & mask.s_addr;
637 if (n >= 4) {
638 ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
639 n -= 2;
640 }
641 while (n) {
642 if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) {
643 if (!(ret = (*proxyfun)(bundle, ip, s)))
644 break;
645 n--;
646 }
647 ip.s_addr = htonl(ntohl(ip.s_addr) + 1);
648 }
649 ret = !n;
650 } else if (Enabled(bundle, OPT_PROXY))
651 ret = (*proxyfun)(bundle, peer, s);
652
653 close(s);
654
655 return ret;
656 }
657
658 static int
659 ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr,
660 struct in_addr hisaddr)
661 {
662 struct bundle *bundle = ipcp->fsm.bundle;
663 struct ncpaddr myncpaddr, hisncpaddr;
664 struct ncprange myrange;
665 struct in_addr mask;
666 struct sockaddr_storage ssdst, ssgw, ssmask;
667 struct sockaddr *sadst, *sagw, *samask;
668
669 sadst = (struct sockaddr *)&ssdst;
670 sagw = (struct sockaddr *)&ssgw;
671 samask = (struct sockaddr *)&ssmask;
672
673 ncpaddr_setip4(&hisncpaddr, hisaddr);
674 ncpaddr_setip4(&myncpaddr, myaddr);
675 ncprange_sethost(&myrange, &myncpaddr);
676
677 mask = addr2mask(myaddr);
678
679 if (ipcp->ifmask.s_addr != INADDR_ANY &&
680 (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr)
681 ncprange_setip4mask(&myrange, ipcp->ifmask);
682
683 if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr,
684 IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM))
685 return 0;
686
687 if (!Enabled(bundle, OPT_IFACEALIAS))
688 iface_Clear(bundle->iface, &bundle->ncp, AF_INET,
689 IFACE_CLEAR_ALIASES|IFACE_SYSTEM);
690
691 if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) {
692 ncprange_getsa(&myrange, &ssgw, &ssmask);
693 ncpaddr_getsa(&hisncpaddr, &ssdst);
694 rt_Update(bundle, sadst, sagw, samask);
695 }
696
697 if (Enabled(bundle, OPT_SROUTES))
698 route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr);
699
700 #ifndef NORADIUS
701 if (bundle->radius.valid)
702 route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr);
703 #endif
704
705 return 1; /* Ok */
706 }
707
708 static struct in_addr
709 ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
710 {
711 struct in_addr try;
712 u_long f;
713
714 for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
715 try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
716 log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
717 f, inet_ntoa(try));
718 if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) {
719 log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
720 break;
721 }
722 }
723
724 if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
725 log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
726 try.s_addr = INADDR_ANY;
727 }
728
729 return try;
730 }
731
732 static void
733 IpcpInitRestartCounter(struct fsm *fp, int what)
734 {
735 /* Set fsm timer load */
736 struct ipcp *ipcp = fsm2ipcp(fp);
737
738 fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
739 switch (what) {
740 case FSM_REQ_TIMER:
741 fp->restart = ipcp->cfg.fsm.maxreq;
742 break;
743 case FSM_TRM_TIMER:
744 fp->restart = ipcp->cfg.fsm.maxtrm;
745 break;
746 default:
747 fp->restart = 1;
748 break;
749 }
750 }
751
752 static void
753 IpcpSendConfigReq(struct fsm *fp)
754 {
755 /* Send config REQ please */
756 struct physical *p = link2physical(fp->link);
757 struct ipcp *ipcp = fsm2ipcp(fp);
758 u_char buff[24];
759 struct fsm_opt *o;
760
761 o = (struct fsm_opt *)buff;
762
763 if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
764 memcpy(o->data, &ipcp->my_ip.s_addr, 4);
765 INC_FSM_OPT(TY_IPADDR, 6, o);
766 }
767
768 if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
769 if (ipcp->heis1172) {
770 u_int16_t proto = PROTO_VJCOMP;
771
772 ua_htons(&proto, o->data);
773 INC_FSM_OPT(TY_COMPPROTO, 4, o);
774 } else {
775 struct compreq req;
776
777 req.proto = htons(ipcp->my_compproto >> 16);
778 req.slots = (ipcp->my_compproto >> 8) & 255;
779 req.compcid = ipcp->my_compproto & 1;
780 memcpy(o->data, &req, 4);
781 INC_FSM_OPT(TY_COMPPROTO, 6, o);
782 }
783 }
784
785 if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
786 if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) {
787 memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4);
788 INC_FSM_OPT(TY_PRIMARY_DNS, 6, o);
789 }
790
791 if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
792 memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4);
793 INC_FSM_OPT(TY_SECONDARY_DNS, 6, o);
794 }
795 }
796
797 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
798 MB_IPCPOUT);
799 }
800
801 static void
802 IpcpSentTerminateReq(struct fsm *fp)
803 {
804 /* Term REQ just sent by FSM */
805 }
806
807 static void
808 IpcpSendTerminateAck(struct fsm *fp, u_char id)
809 {
810 /* Send Term ACK please */
811 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
812 }
813
814 static void
815 IpcpLayerStart(struct fsm *fp)
816 {
817 /* We're about to start up ! */
818 struct ipcp *ipcp = fsm2ipcp(fp);
819
820 log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
821 throughput_start(&ipcp->throughput, "IPCP throughput",
822 Enabled(fp->bundle, OPT_THROUGHPUT));
823 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
824 ipcp->peer_req = 0;
825 }
826
827 static void
828 IpcpLayerFinish(struct fsm *fp)
829 {
830 /* We're now down */
831 struct ipcp *ipcp = fsm2ipcp(fp);
832
833 log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
834 throughput_stop(&ipcp->throughput);
835 throughput_log(&ipcp->throughput, LogIPCP, NULL);
836 }
837
838 /*
839 * Called from iface_Add() via ncp_IfaceAddrAdded()
840 */
841 void
842 ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr)
843 {
844 struct bundle *bundle = ipcp->fsm.bundle;
845
846 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
847 ipcp_proxyarp(ipcp, arp_SetProxy, addr);
848 }
849
850 /*
851 * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted()
852 */
853 void
854 ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr)
855 {
856 struct bundle *bundle = ipcp->fsm.bundle;
857
858 if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL))
859 ipcp_proxyarp(ipcp, arp_ClearProxy, addr);
860 }
861
862 static void
863 IpcpLayerDown(struct fsm *fp)
864 {
865 /* About to come down */
866 struct ipcp *ipcp = fsm2ipcp(fp);
867 static int recursing;
868 char addr[16];
869
870 if (!recursing++) {
871 snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip));
872 log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr);
873
874 #ifndef NORADIUS
875 radius_Account(&fp->bundle->radius, &fp->bundle->radacct,
876 fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask,
877 &ipcp->throughput);
878
879 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
880 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE,
881 NULL, NULL);
882 #endif
883
884 /*
885 * XXX this stuff should really live in the FSM. Our config should
886 * associate executable sections in files with events.
887 */
888 if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) {
889 if (bundle_GetLabel(fp->bundle)) {
890 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
891 LINKDOWNFILE, NULL, NULL) < 0)
892 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
893 } else
894 system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
895 }
896
897 ipcp_Setup(ipcp, INADDR_NONE);
898 }
899 recursing--;
900 }
901
902 int
903 ipcp_InterfaceUp(struct ipcp *ipcp)
904 {
905 if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) {
906 log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
907 return 0;
908 }
909
910 if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) {
911 log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n",
912 ipcp->fsm.bundle->iface->name);
913 return 0;
914 }
915
916 #ifndef NONAT
917 if (ipcp->fsm.bundle->NatEnabled)
918 PacketAliasSetAddress(ipcp->my_ip);
919 #endif
920
921 return 1;
922 }
923
924 static int
925 IpcpLayerUp(struct fsm *fp)
926 {
927 /* We're now up */
928 struct ipcp *ipcp = fsm2ipcp(fp);
929 char tbuff[16];
930
931 log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
932 snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
933 log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
934 tbuff, inet_ntoa(ipcp->peer_ip));
935
936 if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
937 sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
938
939 if (!ipcp_InterfaceUp(ipcp))
940 return 0;
941
942 #ifndef NORADIUS
943 radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links,
944 RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput);
945
946 if (fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
947 system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE,
948 NULL, NULL);
949 #endif
950
951 /*
952 * XXX this stuff should really live in the FSM. Our config should
953 * associate executable sections in files with events.
954 */
955 if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
956 if (bundle_GetLabel(fp->bundle)) {
957 if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
958 LINKUPFILE, NULL, NULL) < 0)
959 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
960 } else
961 system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
962 }
963
964 fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
965 log_DisplayPrompts();
966
967 return 1;
968 }
969
970 static void
971 ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
972 {
973 struct bundle *bundle = ipcp->fsm.bundle;
974 struct iface *iface = bundle->iface;
975 struct in_addr myaddr, peer;
976 int n;
977
978 if (iplist_isvalid(&ipcp->cfg.peer_list)) {
979 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
980 if (ip.s_addr == INADDR_ANY ||
981 iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
982 !ipcp_SetIPaddress(ipcp, myaddr, ip)) {
983 log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
984 inet_ntoa(ip));
985 /*
986 * If we've already had a valid address configured for the peer,
987 * try NAKing with that so that we don't have to upset things
988 * too much.
989 */
990 for (n = 0; n < iface->addrs; n++) {
991 if (!ncpaddr_getip4(&iface->addr[n].peer, &peer))
992 continue;
993 if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) {
994 ipcp->peer_ip = peer;
995 break;
996 }
997 }
998
999 if (n == iface->addrs) {
1000 /* Just pick an IP number from our list */
1001 ipcp->peer_ip = ChooseHisAddr(bundle, myaddr);
1002 }
1003
1004 if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1005 *dec->rejend++ = TY_IPADDR;
1006 *dec->rejend++ = 6;
1007 memcpy(dec->rejend, &ip.s_addr, 4);
1008 dec->rejend += 4;
1009 } else {
1010 *dec->nakend++ = TY_IPADDR;
1011 *dec->nakend++ = 6;
1012 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1013 dec->nakend += 4;
1014 }
1015 return;
1016 }
1017 } else if (ip.s_addr == INADDR_ANY ||
1018 !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) {
1019 /*
1020 * If the destination address is not acceptable, NAK with what we
1021 * want to use.
1022 */
1023 *dec->nakend++ = TY_IPADDR;
1024 *dec->nakend++ = 6;
1025 for (n = 0; n < iface->addrs; n++)
1026 if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) {
1027 /* We prefer the already-configured address */
1028 ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend);
1029 break;
1030 }
1031
1032 if (n == iface->addrs)
1033 memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
1034
1035 dec->nakend += 4;
1036 return;
1037 }
1038
1039 ipcp->peer_ip = ip;
1040 *dec->ackend++ = TY_IPADDR;
1041 *dec->ackend++ = 6;
1042 memcpy(dec->ackend, &ip.s_addr, 4);
1043 dec->ackend += 4;
1044 }
1045
1046 static void
1047 IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
1048 struct fsm_decode *dec)
1049 {
1050 /* Deal with incoming PROTO_IPCP */
1051 struct ncpaddr ncpaddr;
1052 struct ipcp *ipcp = fsm2ipcp(fp);
1053 int gotdnsnak;
1054 u_int32_t compproto;
1055 struct compreq *pcomp;
1056 struct in_addr ipaddr, dstipaddr, have_ip;
1057 char tbuff[100], tbuff2[100];
1058 struct fsm_opt *opt, nak;
1059
1060 gotdnsnak = 0;
1061
1062 while (end - cp >= sizeof(opt->hdr)) {
1063 if ((opt = fsm_readopt(&cp)) == NULL)
1064 break;
1065
1066 snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id),
1067 opt->hdr.len);
1068
1069 switch (opt->hdr.id) {
1070 case TY_IPADDR: /* RFC1332 */
1071 memcpy(&ipaddr.s_addr, opt->data, 4);
1072 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1073
1074 switch (mode_type) {
1075 case MODE_REQ:
1076 ipcp->peer_req = 1;
1077 ipcp_ValidateReq(ipcp, ipaddr, dec);
1078 break;
1079
1080 case MODE_NAK:
1081 if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) {
1082 /* Use address suggested by peer */
1083 snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
1084 inet_ntoa(ipcp->my_ip));
1085 log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
1086 ipcp->my_ip = ipaddr;
1087 ncpaddr_setip4(&ncpaddr, ipcp->my_ip);
1088 bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL);
1089 } else {
1090 log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
1091 "%s: Unacceptable address!\n", inet_ntoa(ipaddr));
1092 fsm_Close(&ipcp->fsm);
1093 }
1094 break;
1095
1096 case MODE_REJ:
1097 ipcp->peer_reject |= (1 << opt->hdr.id);
1098 break;
1099 }
1100 break;
1101
1102 case TY_COMPPROTO:
1103 pcomp = (struct compreq *)opt->data;
1104 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
1105 pcomp->compcid;
1106 log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
1107
1108 switch (mode_type) {
1109 case MODE_REQ:
1110 if (!IsAccepted(ipcp->cfg.vj.neg))
1111 fsm_rej(dec, opt);
1112 else {
1113 switch (opt->hdr.len) {
1114 case 4: /* RFC1172 */
1115 if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1116 log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
1117 "protocol !\n");
1118 ipcp->heis1172 = 1;
1119 ipcp->peer_compproto = compproto;
1120 fsm_ack(dec, opt);
1121 } else {
1122 pcomp->proto = htons(PROTO_VJCOMP);
1123 nak.hdr.id = TY_COMPPROTO;
1124 nak.hdr.len = 4;
1125 memcpy(nak.data, &pcomp, 2);
1126 fsm_nak(dec, &nak);
1127 }
1128 break;
1129 case 6: /* RFC1332 */
1130 if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1131 if (pcomp->slots <= MAX_VJ_STATES
1132 && pcomp->slots >= MIN_VJ_STATES) {
1133 /* Ok, we can do that */
1134 ipcp->peer_compproto = compproto;
1135 ipcp->heis1172 = 0;
1136 fsm_ack(dec, opt);
1137 } else {
1138 /* Get as close as we can to what he wants */
1139 ipcp->heis1172 = 0;
1140 pcomp->slots = pcomp->slots < MIN_VJ_STATES ?
1141 MIN_VJ_STATES : MAX_VJ_STATES;
1142 nak.hdr.id = TY_COMPPROTO;
1143 nak.hdr.len = 4;
1144 memcpy(nak.data, &pcomp, 2);
1145 fsm_nak(dec, &nak);
1146 }
1147 } else {
1148 /* What we really want */
1149 pcomp->proto = htons(PROTO_VJCOMP);
1150 pcomp->slots = DEF_VJ_STATES;
1151 pcomp->compcid = 1;
1152 nak.hdr.id = TY_COMPPROTO;
1153 nak.hdr.len = 6;
1154 memcpy(nak.data, &pcomp, sizeof pcomp);
1155 fsm_nak(dec, &nak);
1156 }
1157 break;
1158 default:
1159 fsm_rej(dec, opt);
1160 break;
1161 }
1162 }
1163 break;
1164
1165 case MODE_NAK:
1166 if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
1167 if (pcomp->slots > MAX_VJ_STATES)
1168 pcomp->slots = MAX_VJ_STATES;
1169 else if (pcomp->slots < MIN_VJ_STATES)
1170 pcomp->slots = MIN_VJ_STATES;
1171 compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
1172 pcomp->compcid;
1173 } else
1174 compproto = 0;
1175 log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
1176 tbuff, ipcp->my_compproto, compproto);
1177 ipcp->my_compproto = compproto;
1178 break;
1179
1180 case MODE_REJ:
1181 ipcp->peer_reject |= (1 << opt->hdr.id);
1182 break;
1183 }
1184 break;
1185
1186 case TY_IPADDRS: /* RFC1172 */
1187 memcpy(&ipaddr.s_addr, opt->data, 4);
1188 memcpy(&dstipaddr.s_addr, opt->data + 4, 4);
1189 snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
1190 log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
1191
1192 switch (mode_type) {
1193 case MODE_REQ:
1194 fsm_rej(dec, opt);
1195 break;
1196
1197 case MODE_NAK:
1198 case MODE_REJ:
1199 break;
1200 }
1201 break;
1202
1203 case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */
1204 case TY_SECONDARY_DNS:
1205 memcpy(&ipaddr.s_addr, opt->data, 4);
1206 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1207
1208 switch (mode_type) {
1209 case MODE_REQ:
1210 if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
1211 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1212 fsm_rej(dec, opt);
1213 break;
1214 }
1215 have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1];
1216
1217 if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr &&
1218 ipaddr.s_addr == ipcp->ns.dns[1].s_addr) {
1219 /* Swap 'em 'round */
1220 ipcp->ns.dns[0] = ipcp->ns.dns[1];
1221 ipcp->ns.dns[1] = have_ip;
1222 have_ip = ipcp->ns.dns[0];
1223 }
1224
1225 if (ipaddr.s_addr != have_ip.s_addr) {
1226 /*
1227 * The client has got the DNS stuff wrong (first request) so
1228 * we'll tell 'em how it is
1229 */
1230 nak.hdr.id = opt->hdr.id;
1231 nak.hdr.len = 6;
1232 memcpy(nak.data, &have_ip.s_addr, 4);
1233 fsm_nak(dec, &nak);
1234 } else {
1235 /*
1236 * Otherwise they have it right (this time) so we send a ack packet
1237 * back confirming it... end of story
1238 */
1239 fsm_ack(dec, opt);
1240 }
1241 break;
1242
1243 case MODE_NAK:
1244 if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
1245 gotdnsnak = 1;
1246 memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr,
1247 opt->data, 4);
1248 }
1249 break;
1250
1251 case MODE_REJ: /* Can't do much, stop asking */
1252 ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1253 break;
1254 }
1255 break;
1256
1257 case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */
1258 case TY_SECONDARY_NBNS:
1259 memcpy(&ipaddr.s_addr, opt->data, 4);
1260 log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
1261
1262 switch (mode_type) {
1263 case MODE_REQ:
1264 have_ip.s_addr =
1265 ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
1266
1267 if (have_ip.s_addr == INADDR_ANY) {
1268 log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
1269 ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS));
1270 fsm_rej(dec, opt);
1271 break;
1272 }
1273
1274 if (ipaddr.s_addr != have_ip.s_addr) {
1275 nak.hdr.id = opt->hdr.id;
1276 nak.hdr.len = 6;
1277 memcpy(nak.data, &have_ip.s_addr, 4);
1278 fsm_nak(dec, &nak);
1279 } else
1280 fsm_ack(dec, opt);
1281 break;
1282
1283 case MODE_NAK:
1284 log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id);
1285 break;
1286
1287 case MODE_REJ:
1288 log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id);
1289 break;
1290 }
1291 break;
1292
1293 default:
1294 if (mode_type != MODE_NOP) {
1295 ipcp->my_reject |= (1 << opt->hdr.id);
1296 fsm_rej(dec, opt);
1297 }
1298 break;
1299 }
1300 }
1301
1302 if (gotdnsnak) {
1303 if (ipcp->ns.writable) {
1304 log_Printf(LogDEBUG, "Updating resolver\n");
1305 if (!ipcp_WriteDNS(ipcp)) {
1306 ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
1307 ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
1308 } else
1309 bundle_AdjustDNS(fp->bundle);
1310 } else {
1311 log_Printf(LogDEBUG, "Not updating resolver (readonly)\n");
1312 bundle_AdjustDNS(fp->bundle);
1313 }
1314 }
1315
1316 if (mode_type != MODE_NOP) {
1317 if (mode_type == MODE_REQ && !ipcp->peer_req) {
1318 if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
1319 /*
1320 * Pretend the peer has requested an IP.
1321 * We do this to ensure that we only send one NAK if the only
1322 * reason for the NAK is because the peer isn't sending a
1323 * TY_IPADDR REQ. This stops us from repeatedly trying to tell
1324 * the peer that we have to have an IP address on their end.
1325 */
1326 ipcp->peer_req = 1;
1327 }
1328 ipaddr.s_addr = INADDR_ANY;
1329 ipcp_ValidateReq(ipcp, ipaddr, dec);
1330 }
1331 fsm_opt_normalise(dec);
1332 }
1333 }
1334
1335 extern struct mbuf *
1336 ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
1337 {
1338 /* Got PROTO_IPCP from link */
1339 m_settype(bp, MB_IPCPIN);
1340 if (bundle_Phase(bundle) == PHASE_NETWORK)
1341 fsm_Input(&bundle->ncp.ipcp.fsm, bp);
1342 else {
1343 if (bundle_Phase(bundle) < PHASE_NETWORK)
1344 log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
1345 l->name, bundle_PhaseName(bundle));
1346 m_freem(bp);
1347 }
1348 return NULL;
1349 }
1350
1351 int
1352 ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
1353 {
1354 struct ipcp *ipcp = &bundle->ncp.ipcp;
1355 struct in_addr myaddr;
1356
1357 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1358 iplist_reset(&ipcp->cfg.peer_list);
1359 ipcp->peer_ip = hisaddr;
1360 ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr);
1361 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1362
1363 return ipcp_SetIPaddress(ipcp, myaddr, hisaddr);
1364 }
1365
1366 int
1367 ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
1368 {
1369 struct in_addr myaddr;
1370 struct ncp *ncp = &bundle->ncp;
1371 struct ipcp *ipcp = &ncp->ipcp;
1372 struct ncpaddr ncpaddr;
1373
1374 /* Use `hisaddr' for the peers address (set iface if `setaddr') */
1375 memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
1376 iplist_reset(&ipcp->cfg.peer_list);
1377 if (strpbrk(hisaddr, ",-")) {
1378 iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
1379 if (iplist_isvalid(&ipcp->cfg.peer_list)) {
1380 iplist_setrandpos(&ipcp->cfg.peer_list);
1381 ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
1382 if (ipcp->peer_ip.s_addr == INADDR_ANY) {
1383 log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
1384 return 0;
1385 }
1386 ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip);
1387 } else {
1388 log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
1389 return 0;
1390 }
1391 } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) {
1392 if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) {
1393 log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr);
1394 return 0;
1395 }
1396 ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr);
1397 ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip);
1398
1399 if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip))
1400 return 0;
1401 } else
1402 return 0;
1403
1404 ncpaddr_setip4(&ncpaddr, ipcp->peer_ip);
1405 bundle_AdjustFilters(bundle, NULL, &ncpaddr);
1406
1407 return 1; /* Ok */
1408 }
1409
1410 struct in_addr
1411 addr2mask(struct in_addr addr)
1412 {
1413 u_int32_t haddr = ntohl(addr.s_addr);
1414
1415 haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
1416 IN_CLASSB(haddr) ? IN_CLASSB_NET :
1417 IN_CLASSC_NET;
1418 addr.s_addr = htonl(haddr);
1419
1420 return addr;
1421 }
1422
1423 size_t
1424 ipcp_QueueLen(struct ipcp *ipcp)
1425 {
1426 struct mqueue *q;
1427 size_t result;
1428
1429 result = 0;
1430 for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++)
1431 result += q->len;
1432
1433 return result;
1434 }
1435
1436 int
1437 ipcp_PushPacket(struct ipcp *ipcp, struct link *l)
1438 {
1439 struct bundle *bundle = ipcp->fsm.bundle;
1440 struct mqueue *queue;
1441 struct mbuf *bp;
1442 int m_len;
1443 u_int32_t secs = 0;
1444 unsigned alivesecs = 0;
1445
1446 if (ipcp->fsm.state != ST_OPENED)
1447 return 0;
1448
1449 /*
1450 * If ccp is not open but is required, do nothing.
1451 */
1452 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
1453 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
1454 return 0;
1455 }
1456
1457 queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1;
1458 do {
1459 if (queue->top) {
1460 bp = m_dequeue(queue);
1461 bp = mbuf_Read(bp, &secs, sizeof secs);
1462 bp = m_pullup(bp);
1463 m_len = m_length(bp);
1464 if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive,
1465 &alivesecs)) {
1466 if (secs == 0)
1467 secs = alivesecs;
1468 bundle_StartIdleTimer(bundle, secs);
1469 }
1470 link_PushPacket(l, bp, bundle, 0, PROTO_IP);
1471 ipcp_AddOutOctets(ipcp, m_len);
1472 return 1;
1473 }
1474 } while (queue-- != ipcp->Queue);
1475
1476 return 0;
1477 }
DragonFly BSD