Commit | Line | Data |
---|---|---|
7c0bf99b | 1 | #ifndef lint |
6d0df65e | 2 | static char sccsid[] = "@(#)routed.c 4.12 %G%"; |
7c0bf99b SL |
3 | #endif |
4 | ||
3cec0c76 SL |
5 | /* |
6 | * Routing Table Management Daemon | |
7 | */ | |
8 | #include <sys/types.h> | |
7c0bf99b SL |
9 | #include <sys/ioctl.h> |
10 | #include <sys/socket.h> | |
11 | #include <net/in.h> | |
7c0bf99b SL |
12 | #include <net/if.h> |
13 | #include <errno.h> | |
14 | #include <stdio.h> | |
15 | #include <nlist.h> | |
16 | #include <signal.h> | |
6d0df65e | 17 | #include <time.h> |
7c0bf99b SL |
18 | #include "rip.h" |
19 | #include "router.h" | |
20 | ||
21 | #define LOOPBACKNET 0177 | |
22 | /* casts to keep lint happy */ | |
23 | #define insque(q,p) _insque((caddr_t)q,(caddr_t)p) | |
24 | #define remque(q) _remque((caddr_t)q) | |
25 | #define equal(a1, a2) \ | |
26 | (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof (struct sockaddr)) == 0) | |
77df73ca | 27 | #define min(a,b) ((a)>(b)?(b):(a)) |
7c0bf99b SL |
28 | |
29 | struct nlist nl[] = { | |
30 | #define N_IFNET 0 | |
31 | { "_ifnet" }, | |
32 | 0, | |
33 | }; | |
34 | ||
35 | struct sockaddr_in myaddr = { AF_INET, IPPORT_ROUTESERVER }; | |
36 | ||
37 | int s; | |
77df73ca | 38 | int kmem = -1; |
7c0bf99b SL |
39 | int supplier; /* process should supply updates */ |
40 | int initializing; /* stem off broadcast() calls */ | |
b7fcdb03 | 41 | int install = 1; /* if 1 call kernel */ |
77df73ca SL |
42 | int lookforinterfaces = 1; |
43 | int performnlist = 1; | |
7c0bf99b SL |
44 | int timeval; |
45 | int timer(); | |
46 | int cleanup(); | |
47 | int trace = 0; | |
6d0df65e | 48 | FILE *ftrace; |
7c0bf99b SL |
49 | |
50 | char packet[MAXPACKETSIZE]; | |
51 | ||
3cec0c76 SL |
52 | struct in_addr if_makeaddr(); |
53 | struct ifnet *if_ifwithaddr(), *if_ifwithnet(); | |
7c0bf99b | 54 | extern char *malloc(); |
c5f8709e | 55 | extern int errno, exit(); |
7c0bf99b SL |
56 | |
57 | main(argc, argv) | |
58 | int argc; | |
59 | char *argv[]; | |
60 | { | |
61 | int cc; | |
62 | struct sockaddr from; | |
63 | ||
6d0df65e SL |
64 | #ifndef DEBUG |
65 | if (fork()) | |
66 | exit(0); | |
67 | for (cc = 0; cc < 10; cc++) | |
68 | (void) close(cc); | |
69 | (void) open("/", 0); | |
70 | (void) dup2(0, 1); | |
71 | (void) dup2(0, 2); | |
72 | { int t = open("/dev/tty", 2); | |
73 | if (t >= 0) { | |
74 | ioctl(t, TIOCNOTTY, (char *)0); | |
75 | (void) close(t); | |
76 | } | |
7c0bf99b | 77 | } |
6d0df65e | 78 | #endif |
7c0bf99b | 79 | if (trace) { |
6d0df65e SL |
80 | ftrace = fopen("/etc/routerlog", "w"); |
81 | dup2(fileno(ftrace), 1); | |
82 | dup2(fileno(ftrace), 2); | |
7c0bf99b | 83 | } |
e6b5ed24 | 84 | #ifdef vax || pdp11 |
7c0bf99b SL |
85 | myaddr.sin_port = htons(myaddr.sin_port); |
86 | #endif | |
87 | again: | |
88 | s = socket(SOCK_DGRAM, 0, &myaddr, 0); | |
89 | if (s < 0) { | |
90 | perror("socket"); | |
91 | sleep(30); | |
92 | goto again; | |
93 | } | |
94 | rtinit(); | |
95 | getothers(); | |
77df73ca | 96 | initializing = 1; |
7c0bf99b | 97 | getinterfaces(); |
77df73ca | 98 | initializing = 0; |
7c0bf99b SL |
99 | request(); |
100 | ||
101 | argv++, argc--; | |
102 | while (argc > 0) { | |
103 | if (strcmp(*argv, "-s") == 0) | |
77df73ca | 104 | supplier = 1; |
7c0bf99b SL |
105 | else if (strcmp(*argv, "-q") == 0) |
106 | supplier = 0; | |
107 | argv++, argc--; | |
108 | } | |
109 | sigset(SIGALRM, timer); | |
77df73ca | 110 | timer(); |
7c0bf99b SL |
111 | |
112 | /* | |
113 | * Listen for routing packets | |
114 | */ | |
115 | for (;;) { | |
116 | cc = receive(s, &from, packet, sizeof (packet)); | |
117 | if (cc <= 0) { | |
118 | if (cc < 0 && errno != EINTR) | |
119 | perror("receive"); | |
120 | continue; | |
121 | } | |
122 | sighold(SIGALRM); | |
123 | rip_input(&from, cc); | |
124 | sigrelse(SIGALRM); | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * Look in a file for any gateways we should configure | |
130 | * outside the directly connected ones. This is a kludge, | |
131 | * but until we can find out about gateways on the "other side" | |
132 | * of the ARPANET using GGP, it's a must. | |
133 | * | |
134 | * We don't really know the distance to the gateway, so we | |
135 | * assume it's a neighbor. | |
136 | */ | |
137 | getothers() | |
138 | { | |
139 | struct sockaddr_in dst, gate; | |
140 | FILE *fp = fopen("/etc/gateways", "r"); | |
141 | struct rt_entry *rt; | |
142 | ||
143 | if (fp == NULL) | |
144 | return; | |
145 | bzero((char *)&dst, sizeof (dst)); | |
146 | bzero((char *)&gate, sizeof (gate)); | |
147 | dst.sin_family = AF_INET; | |
148 | gate.sin_family = AF_INET; | |
149 | while (fscanf(fp, "%x %x", &dst.sin_addr.s_addr, | |
150 | &gate.sin_addr.s_addr) != EOF) { | |
151 | rtadd((struct sockaddr *)&dst, (struct sockaddr *)&gate, 1); | |
152 | rt = rtlookup((struct sockaddr *)&dst); | |
153 | if (rt) | |
98c1da1f | 154 | rt->rt_state |= RTS_HIDDEN; |
7c0bf99b SL |
155 | } |
156 | fclose(fp); | |
157 | } | |
158 | ||
77df73ca SL |
159 | /* |
160 | * Timer routine: | |
161 | * | |
162 | * o handle timers on table entries, | |
163 | * o invalidate entries which haven't been updated in a while, | |
164 | * o delete entries which are too old, | |
165 | * o retry ioctl's which weren't successful the first | |
166 | * time due to the kernel entry being busy | |
167 | * o if we're an internetwork router, supply routing updates | |
168 | * periodically | |
169 | */ | |
170 | timer() | |
7c0bf99b | 171 | { |
3cec0c76 | 172 | register struct rthash *rh; |
77df73ca | 173 | register struct rt_entry *rt; |
3cec0c76 | 174 | struct rthash *base = hosthash; |
77df73ca | 175 | int doinghost = 1; |
7c0bf99b | 176 | |
77df73ca SL |
177 | if (trace) |
178 | printf(">>> time %d >>>\n", timeval); | |
179 | again: | |
180 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) { | |
181 | rt = rh->rt_forw; | |
182 | for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
7c0bf99b | 183 | |
77df73ca SL |
184 | /* |
185 | * If the host is indicated to be | |
98c1da1f | 186 | * "hidden" (i.e. it's one we got |
77df73ca SL |
187 | * from the initialization file), |
188 | * don't time out it's entry. | |
189 | */ | |
98c1da1f | 190 | if ((rt->rt_state & RTS_HIDDEN) == 0) |
e929cf48 | 191 | rt->rt_timer += TIMER_RATE; |
77df73ca | 192 | log("", rt); |
7c0bf99b | 193 | |
77df73ca SL |
194 | /* |
195 | * If the entry should be deleted | |
196 | * attempt to do so and reclaim space. | |
197 | */ | |
198 | if (rt->rt_timer >= GARBAGE_TIME || | |
e6b5ed24 | 199 | (rt->rt_state & RTS_DELRT)) { |
77df73ca | 200 | rt = rt->rt_back; |
e6b5ed24 | 201 | rtdelete(rt->rt_forw); |
77df73ca SL |
202 | continue; |
203 | } | |
7c0bf99b | 204 | |
77df73ca SL |
205 | /* |
206 | * If we haven't heard from the router | |
207 | * in a long time indicate the route is | |
208 | * hard to reach. | |
209 | */ | |
210 | if (rt->rt_timer >= EXPIRE_TIME) | |
211 | rt->rt_metric = HOPCNT_INFINITY; | |
e6b5ed24 | 212 | if (rt->rt_state & RTS_CHGRT) |
3cec0c76 | 213 | if (!ioctl(s, SIOCCHGRT,(char *)&rt->rt_rt) || |
77df73ca | 214 | --rt->rt_retry == 0) |
e6b5ed24 | 215 | rt->rt_state &= ~RTS_CHGRT; |
7c0bf99b | 216 | |
77df73ca SL |
217 | /* |
218 | * Try to add the route to the kernel tables. | |
219 | * If this fails because the entry already exists | |
220 | * (perhaps because someone manually added it) | |
221 | * change the add to a change. If the operation | |
222 | * fails otherwise (likely because the entry is | |
223 | * in use), retry the operation a few more times. | |
224 | */ | |
e6b5ed24 | 225 | if (rt->rt_state & RTS_ADDRT) { |
3cec0c76 | 226 | if (!ioctl(s, SIOCADDRT,(char *)&rt->rt_rt)) { |
77df73ca | 227 | if (errno == EEXIST) { |
e6b5ed24 SL |
228 | rt->rt_state &= ~RTS_ADDRT; |
229 | rt->rt_state |= RTS_CHGRT; | |
77df73ca SL |
230 | rt->rt_retry = |
231 | (EXPIRE_TIME/TIMER_RATE); | |
232 | continue; | |
233 | } | |
234 | if (--rt->rt_retry) | |
235 | continue; | |
236 | } | |
e6b5ed24 | 237 | rt->rt_state &= ~RTS_ADDRT; |
77df73ca SL |
238 | } |
239 | } | |
240 | } | |
241 | if (doinghost) { | |
242 | doinghost = 0; | |
243 | base = nethash; | |
244 | goto again; | |
245 | } | |
246 | timeval += TIMER_RATE; | |
247 | if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0) | |
248 | getinterfaces(); | |
249 | if (supplier && (timeval % SUPPLY_INTERVAL) == 0) | |
250 | supplyall(); | |
251 | if (trace) | |
252 | printf("<<< time %d <<<\n", timeval); | |
253 | alarm(TIMER_RATE); | |
7c0bf99b SL |
254 | } |
255 | ||
3cec0c76 | 256 | struct ifnet *ifnet; |
7c0bf99b SL |
257 | /* |
258 | * Find the network interfaces attached to this machine. | |
77df73ca | 259 | * The info is used to: |
7c0bf99b SL |
260 | * |
261 | * (1) initialize the routing tables, as done by the kernel. | |
262 | * (2) ignore incoming packets we send. | |
263 | * (3) figure out broadcast capability and addresses. | |
264 | * (4) figure out if we're an internetwork gateway. | |
265 | * | |
266 | * We don't handle anything but Internet addresses. | |
3cec0c76 SL |
267 | * |
268 | * Note: this routine may be called periodically to | |
269 | * scan for new interfaces. In fact, the timer routine | |
270 | * does so based on the flag lookforinterfaces. The | |
271 | * flag performnlist is set whenever something odd occurs | |
272 | * while scanning the kernel; this is likely to occur | |
273 | * if /vmunix isn't up to date (e.g. someone booted /ovmunix). | |
7c0bf99b SL |
274 | */ |
275 | getinterfaces() | |
276 | { | |
77df73ca SL |
277 | struct ifnet *ifp; |
278 | struct ifnet ifstruct, *next; | |
7c0bf99b | 279 | struct sockaddr_in net; |
77df73ca | 280 | register struct sockaddr *dst; |
7c0bf99b SL |
281 | int nets; |
282 | ||
77df73ca SL |
283 | if (performnlist) { |
284 | nlist("/vmunix", nl); | |
285 | if (nl[N_IFNET].n_value == 0) { | |
286 | performnlist++; | |
287 | printf("ifnet: not in namelist\n"); | |
288 | return; | |
289 | } | |
290 | performnlist = 0; | |
7c0bf99b | 291 | } |
7c0bf99b | 292 | if (kmem < 0) { |
77df73ca SL |
293 | kmem = open("/dev/kmem", 0); |
294 | if (kmem < 0) { | |
295 | perror("/dev/kmem"); | |
296 | return; | |
297 | } | |
298 | } | |
299 | if (lseek(kmem, (long)nl[N_IFNET].n_value, 0) == -1 || | |
300 | read(kmem, (char *)&ifp, sizeof (ifp)) != sizeof (ifp)) { | |
301 | performnlist = 1; | |
302 | return; | |
7c0bf99b | 303 | } |
7c0bf99b SL |
304 | bzero((char *)&net, sizeof (net)); |
305 | net.sin_family = AF_INET; | |
71efe4b8 | 306 | lookforinterfaces = 0; |
7c0bf99b | 307 | nets = 0; |
77df73ca SL |
308 | while (ifp) { |
309 | if (lseek(kmem, (long)ifp, 0) == -1 || | |
310 | read(kmem, (char *)&ifstruct, sizeof (ifstruct)) != | |
311 | sizeof (ifstruct)) { | |
7c0bf99b | 312 | perror("read"); |
71efe4b8 | 313 | lookforinterfaces = performnlist = 1; |
7c0bf99b SL |
314 | break; |
315 | } | |
77df73ca SL |
316 | ifp = &ifstruct; |
317 | if ((ifp->if_flags & IFF_UP) == 0) { | |
71efe4b8 | 318 | lookforinterfaces = 1; |
77df73ca SL |
319 | skip: |
320 | ifp = ifp->if_next; | |
321 | continue; | |
322 | } | |
323 | if (ifp->if_addr.sa_family != AF_INET) | |
7c0bf99b | 324 | goto skip; |
77df73ca SL |
325 | /* ignore software loopback networks. */ |
326 | if (ifp->if_net == LOOPBACKNET) | |
7c0bf99b | 327 | goto skip; |
77df73ca SL |
328 | /* check if we already know about this one */ |
329 | if (if_ifwithaddr(&ifstruct.if_addr)) { | |
330 | nets++; | |
7c0bf99b SL |
331 | goto skip; |
332 | } | |
77df73ca SL |
333 | ifp = (struct ifnet *)malloc(sizeof (struct ifnet)); |
334 | if (ifp == 0) { | |
335 | printf("routed: out of memory\n"); | |
336 | break; | |
337 | } | |
338 | bcopy((char *)&ifstruct, (char *)ifp, sizeof (struct ifnet)); | |
7c0bf99b SL |
339 | |
340 | /* | |
77df73ca SL |
341 | * Count the # of directly connected networks |
342 | * and point to point links which aren't looped | |
343 | * back to ourself. This is used below to | |
344 | * decide if we should be a routing "supplier". | |
7c0bf99b | 345 | */ |
77df73ca SL |
346 | if ((ifp->if_flags & IFF_POINTOPOINT) == 0 || |
347 | if_ifwithaddr(&ifp->if_dstaddr) == 0) | |
348 | nets++; | |
349 | ||
350 | if (ifp->if_flags & IFF_POINTOPOINT) | |
351 | dst = &ifp->if_dstaddr; | |
352 | else { | |
353 | net.sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY); | |
354 | dst = (struct sockaddr *)&net; | |
355 | } | |
356 | next = ifp->if_next; | |
357 | ifp->if_next = ifnet; | |
358 | ifnet = ifp; | |
359 | if (rtlookup(dst) == 0) | |
360 | rtadd(dst, &ifp->if_addr, 0); | |
361 | ifp = next; | |
7c0bf99b | 362 | } |
7c0bf99b SL |
363 | supplier = nets > 1; |
364 | } | |
365 | ||
366 | /* | |
367 | * Send a request message to all directly | |
368 | * connected hosts and networks. | |
369 | */ | |
370 | request() | |
371 | { | |
77df73ca | 372 | register struct rip *msg = (struct rip *)packet; |
7c0bf99b | 373 | |
77df73ca SL |
374 | msg->rip_cmd = RIPCMD_REQUEST; |
375 | msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; | |
376 | msg->rip_nets[0].rip_metric = HOPCNT_INFINITY; | |
377 | sendall(); | |
7c0bf99b SL |
378 | } |
379 | ||
380 | /* | |
381 | * Broadcast a new, or modified, routing table entry | |
382 | * to all directly connected hosts and networks. | |
383 | */ | |
384 | broadcast(entry) | |
385 | struct rt_entry *entry; | |
77df73ca SL |
386 | { |
387 | struct rip *msg = (struct rip *)packet; | |
388 | ||
389 | log("broadcast", entry); | |
390 | msg->rip_cmd = RIPCMD_RESPONSE; | |
391 | msg->rip_nets[0].rip_dst = entry->rt_dst; | |
392 | msg->rip_nets[0].rip_metric = min(entry->rt_metric+1, HOPCNT_INFINITY); | |
393 | sendall(); | |
394 | } | |
395 | ||
3cec0c76 SL |
396 | /* |
397 | * Send "packet" to all neighbors. | |
398 | */ | |
77df73ca | 399 | sendall() |
7c0bf99b | 400 | { |
3cec0c76 | 401 | register struct rthash *rh; |
7c0bf99b SL |
402 | register struct rt_entry *rt; |
403 | register struct sockaddr *dst; | |
3cec0c76 | 404 | struct rthash *base = hosthash; |
7c0bf99b | 405 | int doinghost = 1; |
7c0bf99b SL |
406 | |
407 | again: | |
408 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) | |
409 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
98c1da1f | 410 | if ((rt->rt_state & RTS_HIDDEN) || rt->rt_metric > 0) |
7c0bf99b SL |
411 | continue; |
412 | if (rt->rt_ifp && (rt->rt_ifp->if_flags & IFF_BROADCAST)) | |
413 | dst = &rt->rt_ifp->if_broadaddr; | |
414 | else | |
415 | dst = &rt->rt_gateway; | |
416 | (*afswitch[dst->sa_family].af_output)(dst, sizeof (struct rip)); | |
417 | } | |
418 | if (doinghost) { | |
7c0bf99b | 419 | base = nethash; |
77df73ca | 420 | doinghost = 0; |
7c0bf99b SL |
421 | goto again; |
422 | } | |
423 | } | |
424 | ||
425 | /* | |
426 | * Supply all directly connected neighbors with the | |
427 | * current state of the routing tables. | |
428 | */ | |
429 | supplyall() | |
430 | { | |
431 | register struct rt_entry *rt; | |
3cec0c76 | 432 | register struct rthash *rh; |
7c0bf99b | 433 | register struct sockaddr *dst; |
3cec0c76 | 434 | struct rthash *base = hosthash; |
7c0bf99b SL |
435 | int doinghost = 1; |
436 | ||
437 | again: | |
438 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) | |
439 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
98c1da1f | 440 | if ((rt->rt_state & RTS_HIDDEN) || rt->rt_metric > 0) |
7c0bf99b SL |
441 | continue; |
442 | if (rt->rt_ifp && (rt->rt_ifp->if_flags & IFF_BROADCAST)) | |
443 | dst = &rt->rt_ifp->if_broadaddr; | |
444 | else | |
445 | dst = &rt->rt_gateway; | |
77df73ca | 446 | log("supply", rt); |
7c0bf99b SL |
447 | supply(dst); |
448 | } | |
449 | if (doinghost) { | |
450 | base = nethash; | |
451 | doinghost = 0; | |
452 | goto again; | |
453 | } | |
454 | } | |
455 | ||
456 | /* | |
457 | * Supply routing information to target "sa". | |
458 | */ | |
459 | supply(sa) | |
460 | struct sockaddr *sa; | |
461 | { | |
462 | struct rip *msg = (struct rip *)packet; | |
463 | struct netinfo *n = msg->rip_nets; | |
3cec0c76 | 464 | register struct rthash *rh; |
7c0bf99b | 465 | register struct rt_entry *rt; |
3cec0c76 | 466 | struct rthash *base = hosthash; |
77df73ca | 467 | int doinghost = 1, size; |
7c0bf99b SL |
468 | int (*output)() = afswitch[sa->sa_family].af_output; |
469 | ||
470 | msg->rip_cmd = RIPCMD_RESPONSE; | |
471 | again: | |
472 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) | |
473 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
474 | ||
475 | /* | |
476 | * Flush packet out if not enough room for | |
477 | * another routing table entry. | |
478 | */ | |
77df73ca SL |
479 | size = (char *)n - packet; |
480 | if (size > MAXPACKETSIZE - sizeof (struct netinfo)) { | |
481 | (*output)(sa, size); | |
7c0bf99b SL |
482 | n = msg->rip_nets; |
483 | } | |
484 | n->rip_dst = rt->rt_dst; | |
77df73ca SL |
485 | n->rip_metric = min(rt->rt_metric + 1, HOPCNT_INFINITY); |
486 | n++; | |
7c0bf99b SL |
487 | } |
488 | if (doinghost) { | |
489 | doinghost = 0; | |
490 | base = nethash; | |
491 | goto again; | |
492 | } | |
77df73ca SL |
493 | if (n != msg->rip_nets) |
494 | (*output)(sa, (char *)n - packet); | |
7c0bf99b SL |
495 | } |
496 | ||
497 | /* | |
498 | * Respond to a routing info request. | |
499 | */ | |
500 | rip_respond(from, size) | |
501 | struct sockaddr *from; | |
502 | int size; | |
503 | { | |
504 | register struct rip *msg = (struct rip *)packet; | |
505 | struct netinfo *np = msg->rip_nets; | |
506 | struct rt_entry *rt; | |
507 | int newsize = 0; | |
508 | ||
77df73ca | 509 | size -= 4 * sizeof (char); |
7c0bf99b SL |
510 | while (size > 0) { |
511 | if (size < sizeof (struct netinfo)) | |
512 | break; | |
513 | size -= sizeof (struct netinfo); | |
514 | if (np->rip_dst.sa_family == AF_UNSPEC && | |
515 | np->rip_metric == HOPCNT_INFINITY && size == 0) { | |
516 | supply(from); | |
517 | return; | |
518 | } | |
519 | rt = rtlookup(&np->rip_dst); | |
77df73ca SL |
520 | np->rip_metric = rt == 0 ? |
521 | HOPCNT_INFINITY : min(rt->rt_metric+1, HOPCNT_INFINITY); | |
7c0bf99b SL |
522 | np++, newsize += sizeof (struct netinfo); |
523 | } | |
524 | if (newsize > 0) { | |
525 | msg->rip_cmd = RIPCMD_RESPONSE; | |
526 | newsize += sizeof (int); | |
527 | (*afswitch[from->sa_family].af_output)(from, newsize); | |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
532 | * Handle an incoming routing packet. | |
533 | */ | |
534 | rip_input(from, size) | |
535 | struct sockaddr *from; | |
536 | int size; | |
537 | { | |
538 | register struct rip *msg = (struct rip *)packet; | |
539 | struct rt_entry *rt; | |
540 | struct netinfo *n; | |
541 | ||
e6b5ed24 | 542 | switch (msg->rip_cmd) { |
7c0bf99b | 543 | |
e6b5ed24 | 544 | default: |
7c0bf99b | 545 | return; |
e6b5ed24 SL |
546 | |
547 | case RIPCMD_REQUEST: | |
7c0bf99b SL |
548 | rip_respond(from, size); |
549 | return; | |
e6b5ed24 | 550 | |
6d0df65e SL |
551 | case RIPCMD_TRACEON: |
552 | case RIPCMD_TRACEOFF: | |
e6b5ed24 | 553 | /* verify message came from a priviledged port */ |
6d0df65e SL |
554 | if ((*afswitch[from->sa_family].af_portcheck)(from) == 0) |
555 | return; | |
556 | tracecmd(msg->rip_cmd, msg, size); | |
557 | return; | |
558 | ||
559 | case RIPCMD_RESPONSE: | |
560 | /* verify message came from a router */ | |
e6b5ed24 SL |
561 | if ((*afswitch[from->sa_family].af_portmatch)(from) == 0) |
562 | return; | |
563 | break; | |
7c0bf99b SL |
564 | } |
565 | ||
566 | /* | |
567 | * Process updates. | |
568 | * Extraneous information like Internet ports | |
569 | * must first be purged from the sender's address for | |
570 | * pattern matching below. | |
571 | */ | |
572 | (*afswitch[from->sa_family].af_canon)(from); | |
573 | if (trace) | |
3cec0c76 SL |
574 | printf("input from %x\n", |
575 | ((struct sockaddr_in *)from)->sin_addr); | |
7c0bf99b SL |
576 | /* |
577 | * If response packet is from ourselves, use it only | |
578 | * to reset timer on entry. Otherwise, we'd believe | |
579 | * it as gospel (since it comes from the router) and | |
580 | * unknowingly update the metric to show the outgoing | |
581 | * cost (higher than our real cost). I guess the protocol | |
582 | * spec doesn't address this because Xerox Ethernets | |
583 | * don't hear their own broadcasts? | |
584 | */ | |
585 | if (if_ifwithaddr(from)) { | |
eae14a37 | 586 | rt = rtfind(from); |
7c0bf99b SL |
587 | if (rt) |
588 | rt->rt_timer = 0; | |
589 | return; | |
590 | } | |
77df73ca | 591 | size -= 4 * sizeof (char); |
7c0bf99b SL |
592 | n = msg->rip_nets; |
593 | for (; size > 0; size -= sizeof (struct netinfo), n++) { | |
594 | if (size < sizeof (struct netinfo)) | |
595 | break; | |
596 | if (trace) | |
3cec0c76 SL |
597 | printf("dst %x hc %d...", |
598 | ((struct sockaddr_in *)&n->rip_dst)->sin_addr, | |
7c0bf99b SL |
599 | n->rip_metric); |
600 | rt = rtlookup(&n->rip_dst); | |
601 | ||
602 | /* | |
603 | * Unknown entry, add it to the tables only if | |
604 | * its interesting. | |
605 | */ | |
606 | if (rt == 0) { | |
607 | if (n->rip_metric < HOPCNT_INFINITY) | |
608 | rtadd(&n->rip_dst, from, n->rip_metric); | |
609 | if (trace) | |
610 | printf("new\n"); | |
611 | continue; | |
612 | } | |
613 | ||
614 | if (trace) | |
615 | printf("ours: gate %x hc %d timer %d\n", | |
3cec0c76 SL |
616 | ((struct sockaddr_in *)&rt->rt_gateway)->sin_addr, |
617 | rt->rt_metric, rt->rt_timer); | |
7c0bf99b SL |
618 | /* |
619 | * Update the entry if one of the following is true: | |
620 | * | |
621 | * (1) The update came directly from the gateway. | |
622 | * (2) A shorter path is provided. | |
623 | * (3) The entry hasn't been updated in a while | |
77df73ca SL |
624 | * and a path of equivalent cost is offered |
625 | * (with the cost finite). | |
7c0bf99b SL |
626 | */ |
627 | if (equal(from, &rt->rt_gateway) || | |
628 | rt->rt_metric > n->rip_metric || | |
629 | (rt->rt_timer > (EXPIRE_TIME/2) && | |
77df73ca SL |
630 | rt->rt_metric == n->rip_metric && |
631 | rt->rt_metric < HOPCNT_INFINITY)) { | |
7c0bf99b SL |
632 | rtchange(rt, from, n->rip_metric); |
633 | rt->rt_timer = 0; | |
634 | } | |
635 | } | |
636 | } | |
637 | ||
6d0df65e SL |
638 | /* |
639 | * Handle tracing requests. | |
640 | */ | |
641 | tracecmd(cmd, msg, size) | |
642 | int cmd, size; | |
643 | struct rip *msg; | |
644 | { | |
645 | time_t t; | |
646 | ||
647 | if (cmd == RIPCMD_TRACEOFF) { | |
648 | if (!trace) | |
649 | return; | |
650 | t = time(0); | |
651 | printf("*** Tracing turned off at %.24s ***\n", ctime(&t)); | |
652 | fflush(stdout), fflush(stderr); | |
653 | if (ftrace) | |
654 | fclose(ftrace); | |
655 | (void) close(1), (void) close(2); | |
656 | trace = 0; | |
657 | return; | |
658 | } | |
659 | if (trace) | |
660 | return; | |
661 | packet[size] = '\0'; | |
662 | ftrace = fopen(msg->rip_tracefile, "a"); | |
663 | if (ftrace == NULL) | |
664 | return; | |
665 | (void) dup2(fileno(ftrace), 1); | |
666 | (void) dup2(fileno(ftrace), 2); | |
667 | trace = 1; | |
668 | t = time(0); | |
669 | printf("*** Tracing turned on at %.24s ***\n", ctime(&t)); | |
670 | } | |
671 | ||
3cec0c76 SL |
672 | rtinit() |
673 | { | |
674 | register struct rthash *rh; | |
675 | ||
676 | for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++) | |
677 | rh->rt_forw = rh->rt_back = (struct rt_entry *)rh; | |
678 | for (rh = hosthash; rh < &hosthash[ROUTEHASHSIZ]; rh++) | |
679 | rh->rt_forw = rh->rt_back = (struct rt_entry *)rh; | |
680 | } | |
681 | ||
7c0bf99b SL |
682 | /* |
683 | * Lookup an entry to the appropriate dstination. | |
684 | */ | |
685 | struct rt_entry * | |
686 | rtlookup(dst) | |
687 | struct sockaddr *dst; | |
688 | { | |
689 | register struct rt_entry *rt; | |
3cec0c76 | 690 | register struct rthash *rh; |
eae14a37 | 691 | register int hash; |
7c0bf99b | 692 | struct afhash h; |
eae14a37 SL |
693 | int doinghost = 1; |
694 | ||
695 | if (dst->sa_family >= AF_MAX) | |
696 | return (0); | |
697 | (*afswitch[dst->sa_family].af_hash)(dst, &h); | |
698 | hash = h.afh_hosthash; | |
699 | rh = &hosthash[hash % ROUTEHASHSIZ]; | |
700 | again: | |
701 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
702 | if (rt->rt_hash != hash) | |
703 | continue; | |
704 | if (equal(&rt->rt_dst, dst)) | |
705 | return (rt); | |
706 | } | |
707 | if (doinghost) { | |
708 | doinghost = 0; | |
709 | hash = h.afh_nethash; | |
710 | rh = &nethash[hash % ROUTEHASHSIZ]; | |
711 | goto again; | |
712 | } | |
713 | return (0); | |
714 | } | |
715 | ||
716 | /* | |
717 | * Find an entry based on address "dst", as the kernel | |
718 | * does in selecting routes. This means we look first | |
719 | * for a point to point link, settling for a route to | |
720 | * the destination network if the former fails. | |
721 | */ | |
722 | struct rt_entry * | |
723 | rtfind(dst) | |
724 | struct sockaddr *dst; | |
725 | { | |
726 | register struct rt_entry *rt; | |
727 | register struct rthash *rh; | |
728 | register int hash; | |
729 | struct afhash h; | |
730 | int af = dst->sa_family; | |
731 | int doinghost = 1, (*match)(); | |
7c0bf99b SL |
732 | |
733 | if (af >= AF_MAX) | |
734 | return (0); | |
735 | (*afswitch[af].af_hash)(dst, &h); | |
736 | hash = h.afh_hosthash; | |
737 | rh = &hosthash[hash % ROUTEHASHSIZ]; | |
738 | ||
739 | again: | |
740 | for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { | |
741 | if (rt->rt_hash != hash) | |
742 | continue; | |
743 | if (doinghost) { | |
744 | if (equal(&rt->rt_dst, dst)) | |
745 | return (rt); | |
746 | } else { | |
747 | if (rt->rt_dst.sa_family == af && | |
748 | (*match)(&rt->rt_dst, dst)) | |
749 | return (rt); | |
750 | } | |
751 | } | |
752 | if (doinghost) { | |
753 | doinghost = 0; | |
754 | hash = h.afh_nethash; | |
7c0bf99b | 755 | rh = &nethash[hash % ROUTEHASHSIZ]; |
eae14a37 | 756 | match = afswitch[af].af_netmatch; |
7c0bf99b SL |
757 | goto again; |
758 | } | |
759 | return (0); | |
760 | } | |
761 | ||
7c0bf99b SL |
762 | /* |
763 | * Add a new entry. | |
764 | */ | |
765 | rtadd(dst, gate, metric) | |
766 | struct sockaddr *dst, *gate; | |
767 | short metric; | |
768 | { | |
769 | struct afhash h; | |
770 | register struct rt_entry *rt; | |
3cec0c76 | 771 | struct rthash *rh; |
7c0bf99b SL |
772 | int af = dst->sa_family, flags, hash; |
773 | ||
774 | if (af >= AF_MAX) | |
775 | return; | |
776 | (*afswitch[af].af_hash)(dst, &h); | |
777 | flags = (*afswitch[af].af_checkhost)(dst) ? RTF_HOST : 0; | |
778 | if (flags & RTF_HOST) { | |
779 | hash = h.afh_hosthash; | |
780 | rh = &hosthash[hash % ROUTEHASHSIZ]; | |
781 | } else { | |
782 | hash = h.afh_nethash; | |
783 | rh = &nethash[hash % ROUTEHASHSIZ]; | |
784 | } | |
785 | rt = (struct rt_entry *)malloc(sizeof (*rt)); | |
786 | if (rt == 0) | |
787 | return; | |
788 | rt->rt_hash = hash; | |
789 | rt->rt_dst = *dst; | |
790 | rt->rt_gateway = *gate; | |
791 | rt->rt_metric = metric; | |
792 | rt->rt_timer = 0; | |
793 | rt->rt_flags = RTF_UP | flags; | |
e6b5ed24 | 794 | rt->rt_state = 0; |
7c0bf99b SL |
795 | rt->rt_ifp = if_ifwithnet(&rt->rt_gateway); |
796 | if (metric == 0) | |
797 | rt->rt_flags |= RTF_DIRECT; | |
798 | insque(rt, rh); | |
77df73ca | 799 | log("add", rt); |
7c0bf99b SL |
800 | if (initializing) |
801 | return; | |
802 | if (supplier) | |
803 | broadcast(rt); | |
804 | if (install) { | |
e6b5ed24 | 805 | rt->rt_state |= RTS_ADDRT; |
7c0bf99b SL |
806 | rt->rt_retry = EXPIRE_TIME/TIMER_RATE; |
807 | } | |
808 | } | |
809 | ||
810 | /* | |
811 | * Look to see if a change to an existing entry | |
812 | * is warranted; if so, make it. | |
813 | */ | |
814 | rtchange(rt, gate, metric) | |
815 | struct rt_entry *rt; | |
816 | struct sockaddr *gate; | |
817 | short metric; | |
818 | { | |
819 | int change = 0; | |
820 | ||
821 | if (!equal(&rt->rt_gateway, gate)) { | |
822 | rt->rt_gateway = *gate; | |
823 | change++; | |
824 | } | |
825 | ||
826 | /* | |
827 | * If the hop count has changed, adjust | |
828 | * the flags in the routing table entry accordingly. | |
829 | */ | |
830 | if (metric != rt->rt_metric) { | |
831 | if (rt->rt_metric == 0) | |
832 | rt->rt_flags &= ~RTF_DIRECT; | |
833 | rt->rt_metric = metric; | |
834 | if (metric >= HOPCNT_INFINITY) | |
835 | rt->rt_flags &= ~RTF_UP; | |
836 | else | |
837 | rt->rt_flags |= RTF_UP; | |
838 | change++; | |
839 | } | |
840 | ||
841 | if (!change) | |
842 | return; | |
843 | if (supplier) | |
844 | broadcast(rt); | |
77df73ca | 845 | log("change", rt); |
7c0bf99b | 846 | if (install) { |
e6b5ed24 | 847 | rt->rt_state |= RTS_CHGRT; |
7c0bf99b SL |
848 | rt->rt_retry = EXPIRE_TIME/TIMER_RATE; |
849 | } | |
850 | } | |
851 | ||
852 | /* | |
853 | * Delete a routing table entry. | |
854 | */ | |
855 | rtdelete(rt) | |
856 | struct rt_entry *rt; | |
857 | { | |
77df73ca | 858 | log("delete", rt); |
7c0bf99b | 859 | if (install) |
3cec0c76 | 860 | if (ioctl(s, SIOCDELRT, (char *)&rt->rt_rt) && |
7c0bf99b | 861 | errno == EBUSY) |
e6b5ed24 | 862 | rt->rt_state |= RTS_DELRT; |
7c0bf99b SL |
863 | remque(rt); |
864 | free((char *)rt); | |
865 | } | |
866 | ||
7c0bf99b SL |
867 | log(operation, rt) |
868 | char *operation; | |
869 | struct rt_entry *rt; | |
870 | { | |
871 | time_t t = time(0); | |
872 | struct sockaddr_in *dst, *gate; | |
e6b5ed24 | 873 | static struct bits { |
7c0bf99b SL |
874 | int t_bits; |
875 | char *t_name; | |
e6b5ed24 | 876 | } flagbits[] = { |
7c0bf99b SL |
877 | { RTF_UP, "UP" }, |
878 | { RTF_DIRECT, "DIRECT" }, | |
879 | { RTF_HOST, "HOST" }, | |
e6b5ed24 SL |
880 | { 0 } |
881 | }, statebits[] = { | |
882 | { RTS_DELRT, "DELETE" }, | |
883 | { RTS_CHGRT, "CHANGE" }, | |
98c1da1f | 884 | { RTS_HIDDEN, "HIDDEN" }, |
7c0bf99b SL |
885 | { 0 } |
886 | }; | |
e6b5ed24 | 887 | register struct bits *p; |
7c0bf99b SL |
888 | register int first; |
889 | char *cp; | |
890 | ||
77df73ca SL |
891 | if (trace == 0) |
892 | return; | |
7c0bf99b SL |
893 | printf("%s ", operation); |
894 | dst = (struct sockaddr_in *)&rt->rt_dst; | |
895 | gate = (struct sockaddr_in *)&rt->rt_gateway; | |
e6b5ed24 | 896 | printf("dst %x, router %x, metric %d, flags", |
7c0bf99b | 897 | dst->sin_addr, gate->sin_addr, rt->rt_metric); |
e6b5ed24 SL |
898 | cp = " %s"; |
899 | for (first = 1, p = flagbits; p->t_bits > 0; p++) { | |
7c0bf99b SL |
900 | if ((rt->rt_flags & p->t_bits) == 0) |
901 | continue; | |
902 | printf(cp, p->t_name); | |
903 | if (first) { | |
904 | cp = "|%s"; | |
905 | first = 0; | |
906 | } | |
907 | } | |
e6b5ed24 SL |
908 | printf(" state"); |
909 | cp = " %s"; | |
910 | for (first = 1, p = statebits; p->t_bits > 0; p++) { | |
911 | if ((rt->rt_state & p->t_bits) == 0) | |
912 | continue; | |
913 | printf(cp, p->t_name); | |
914 | if (first) { | |
915 | cp = "|%s"; | |
916 | first = 0; | |
917 | } | |
918 | } | |
7c0bf99b SL |
919 | putchar('\n'); |
920 | } | |
77df73ca | 921 | |
3cec0c76 SL |
922 | /* |
923 | * Find the interface with address "addr". | |
924 | */ | |
77df73ca SL |
925 | struct ifnet * |
926 | if_ifwithaddr(addr) | |
927 | struct sockaddr *addr; | |
928 | { | |
929 | register struct ifnet *ifp; | |
930 | ||
931 | #define same(a1, a2) \ | |
932 | (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) | |
933 | for (ifp = ifnet; ifp; ifp = ifp->if_next) { | |
934 | if (ifp->if_addr.sa_family != addr->sa_family) | |
935 | continue; | |
936 | if (same(&ifp->if_addr, addr)) | |
937 | break; | |
938 | if ((ifp->if_flags & IFF_BROADCAST) && | |
939 | same(&ifp->if_broadaddr, addr)) | |
940 | break; | |
941 | } | |
942 | return (ifp); | |
943 | #undef same | |
944 | } | |
945 | ||
3cec0c76 SL |
946 | /* |
947 | * Find the interface with network imbedded in | |
948 | * the sockaddr "addr". Must use per-af routine | |
949 | * look for match. | |
950 | */ | |
77df73ca SL |
951 | struct ifnet * |
952 | if_ifwithnet(addr) | |
953 | register struct sockaddr *addr; | |
954 | { | |
955 | register struct ifnet *ifp; | |
956 | register int af = addr->sa_family; | |
957 | register int (*netmatch)(); | |
958 | ||
959 | if (af >= AF_MAX) | |
960 | return (0); | |
961 | netmatch = afswitch[af].af_netmatch; | |
962 | for (ifp = ifnet; ifp; ifp = ifp->if_next) { | |
963 | if (af != ifp->if_addr.sa_family) | |
964 | continue; | |
965 | if ((*netmatch)(addr, &ifp->if_addr)) | |
966 | break; | |
967 | } | |
968 | return (ifp); | |
969 | } | |
970 | ||
3cec0c76 SL |
971 | /* |
972 | * Formulate an Internet address. | |
973 | */ | |
77df73ca SL |
974 | struct in_addr |
975 | if_makeaddr(net, host) | |
976 | int net, host; | |
977 | { | |
978 | u_long addr; | |
979 | ||
980 | if (net < 128) | |
981 | addr = (net << 24) | host; | |
982 | else if (net < 65536) | |
983 | addr = (net << 16) | host; | |
984 | else | |
985 | addr = (net << 8) | host; | |
986 | #ifdef vax | |
987 | addr = htonl(addr); | |
988 | #endif | |
989 | return (*(struct in_addr *)&addr); | |
990 | } |