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Commit | Line | Data |
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b1a1faba OF |
1 | /* |
2 | * BIRD -- Unix Routing Table Syncing | |
3 | * | |
4 | * (c) 2004 Ondrej Filip <feela@network.cz> | |
5 | * | |
6 | * Can be freely distributed and used under the terms of the GNU GPL. | |
7 | */ | |
8 | ||
9 | #include <stdio.h> | |
10 | #include <ctype.h> | |
11 | #include <fcntl.h> | |
12 | #include <unistd.h> | |
13 | #include <sys/param.h> | |
14 | #include <sys/types.h> | |
15 | #include <sys/socket.h> | |
16 | #include <sys/sysctl.h> | |
17 | #include <sys/ioctl.h> | |
18 | #include <netinet/in.h> | |
19 | #include <net/route.h> | |
20 | #include <net/if.h> | |
21 | #include <net/if_dl.h> | |
22 | ||
23 | #undef LOCAL_DEBUG | |
24 | ||
25 | #include "nest/bird.h" | |
26 | #include "nest/iface.h" | |
27 | #include "nest/route.h" | |
28 | #include "nest/protocol.h" | |
29 | #include "nest/iface.h" | |
30 | #include "lib/timer.h" | |
31 | #include "lib/unix.h" | |
32 | #include "lib/krt.h" | |
33 | #include "lib/string.h" | |
34 | #include "lib/socket.h" | |
35 | ||
b1a1faba OF |
36 | int rt_sock = 0; |
37 | ||
b1a1faba OF |
38 | int |
39 | krt_capable(rte *e) | |
40 | { | |
41 | rta *a = e->attrs; | |
42 | ||
b1a1faba OF |
43 | return |
44 | a->cast == RTC_UNICAST && | |
45 | (a->dest == RTD_ROUTER | |
46 | || a->dest == RTD_DEVICE | |
47 | #ifdef RTF_REJECT | |
48 | || a->dest == RTD_UNREACHABLE | |
49 | #endif | |
50 | #ifdef RTF_BLACKHOLE | |
ff2857b0 | 51 | || a->dest == RTD_BLACKHOLE |
b1a1faba OF |
52 | #endif |
53 | ); | |
54 | } | |
55 | ||
56 | #define ROUNDUP(a) \ | |
57 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) | |
58 | ||
59 | #define NEXTADDR(w, u) \ | |
60 | if (msg.rtm.rtm_addrs & (w)) {\ | |
61 | l = ROUNDUP(((struct sockaddr *)&(u))->sa_len);\ | |
62 | memmove(body, &(u), l); body += l;} | |
63 | ||
ff2857b0 OZ |
64 | #define GETADDR(p, F) \ |
65 | bzero(p, sizeof(*p));\ | |
66 | if ((addrs & (F)) && ((struct sockaddr *)body)->sa_len) {\ | |
67 | unsigned int l = ROUNDUP(((struct sockaddr *)body)->sa_len);\ | |
68 | memcpy(p, body, (l > sizeof(*p) ? sizeof(*p) : l));\ | |
69 | body += l;} | |
70 | ||
32f95476 | 71 | static int |
fb257e43 | 72 | krt_sock_send(int cmd, rte *e) |
b1a1faba OF |
73 | { |
74 | net *net = e->net; | |
75 | rta *a = e->attrs; | |
76 | static int msg_seq; | |
77 | struct iface *j, *i = a->iface; | |
78 | int l; | |
79 | struct ks_msg msg; | |
80 | char *body = (char *)msg.buf; | |
81 | sockaddr gate, mask, dst; | |
44aa101c | 82 | ip_addr gw; |
b1a1faba | 83 | |
ff2857b0 | 84 | DBG("krt-sock: send %I/%d via %I\n", net->n.prefix, net->n.pxlen, a->gw); |
b1a1faba | 85 | |
b88a1d40 | 86 | bzero(&msg,sizeof (struct rt_msghdr)); |
b1a1faba OF |
87 | msg.rtm.rtm_version = RTM_VERSION; |
88 | msg.rtm.rtm_type = cmd; | |
89 | msg.rtm.rtm_seq = msg_seq++; | |
90 | msg.rtm.rtm_addrs = RTA_DST; | |
ff2857b0 | 91 | msg.rtm.rtm_flags = RTF_UP | RTF_PROTO1; |
b1a1faba | 92 | |
ff2857b0 | 93 | if (net->n.pxlen == MAX_PREFIX_LENGTH) |
b1a1faba OF |
94 | { |
95 | msg.rtm.rtm_flags |= RTF_HOST; | |
96 | } | |
97 | else | |
98 | { | |
99 | msg.rtm.rtm_addrs |= RTA_NETMASK; | |
100 | } | |
101 | ||
102 | #ifdef RTF_REJECT | |
103 | if(a->dest == RTD_UNREACHABLE) | |
104 | msg.rtm.rtm_flags |= RTF_REJECT; | |
105 | #endif | |
106 | #ifdef RTF_BLACKHOLE | |
107 | if(a->dest == RTD_BLACKHOLE) | |
108 | msg.rtm.rtm_flags |= RTF_BLACKHOLE; | |
109 | #endif | |
110 | ||
111 | /* This is really very nasty, but I'm not able | |
112 | * to add "(reject|blackhole)" route without | |
113 | * gateway set | |
114 | */ | |
115 | if(!i) | |
116 | { | |
8281ff20 | 117 | i = HEAD(iface_list); |
77772dbc | 118 | |
8281ff20 OF |
119 | WALK_LIST(j, iface_list) |
120 | { | |
121 | if (j->flags & IF_LOOPBACK) | |
b1a1faba | 122 | { |
8281ff20 OF |
123 | i = j; |
124 | break; | |
b1a1faba OF |
125 | } |
126 | } | |
127 | } | |
128 | ||
44aa101c OZ |
129 | gw = a->gw; |
130 | ||
131 | #ifdef IPV6 | |
132 | /* Embed interface ID to link-local address */ | |
133 | if (ipa_has_link_scope(gw)) | |
134 | _I0(gw) = 0xfe800000 | (i->index & 0x0000ffff); | |
135 | #endif | |
136 | ||
d7f469c1 OZ |
137 | fill_in_sockaddr(&dst, net->n.prefix, NULL, 0); |
138 | fill_in_sockaddr(&mask, ipa_mkmask(net->n.pxlen), NULL, 0); | |
139 | fill_in_sockaddr(&gate, gw, NULL, 0); | |
44aa101c | 140 | |
b1a1faba OF |
141 | switch (a->dest) |
142 | { | |
143 | case RTD_ROUTER: | |
144 | msg.rtm.rtm_flags |= RTF_GATEWAY; | |
145 | msg.rtm.rtm_addrs |= RTA_GATEWAY; | |
146 | break; | |
147 | #ifdef RTF_REJECT | |
148 | case RTD_UNREACHABLE: | |
149 | #endif | |
150 | #ifdef RTF_BLACKHOLE | |
151 | case RTD_BLACKHOLE: | |
152 | #endif | |
153 | case RTD_DEVICE: | |
154 | if(i) | |
155 | { | |
7d196668 | 156 | #ifdef RTF_CLONING |
b1a1faba OF |
157 | if (cmd == RTM_ADD && (i->flags & IF_MULTIACCESS) != IF_MULTIACCESS) /* PTP */ |
158 | msg.rtm.rtm_flags |= RTF_CLONING; | |
7d196668 | 159 | #endif |
b1a1faba OF |
160 | |
161 | if(!i->addr) { | |
c429d4a4 | 162 | log(L_ERR "KRT: interface %s has no IP addess", i->name); |
32f95476 | 163 | return -1; |
b1a1faba OF |
164 | } |
165 | ||
d7f469c1 | 166 | fill_in_sockaddr(&gate, i->addr->ip, NULL, 0); |
b1a1faba OF |
167 | msg.rtm.rtm_addrs |= RTA_GATEWAY; |
168 | } | |
b1a1faba OF |
169 | break; |
170 | default: | |
171 | bug("krt-sock: unknown flags, but not filtered"); | |
172 | } | |
173 | ||
1554cc02 | 174 | msg.rtm.rtm_index = i->index; |
b1a1faba OF |
175 | |
176 | NEXTADDR(RTA_DST, dst); | |
177 | NEXTADDR(RTA_GATEWAY, gate); | |
178 | NEXTADDR(RTA_NETMASK, mask); | |
179 | ||
180 | l = body - (char *)&msg; | |
181 | msg.rtm.rtm_msglen = l; | |
182 | ||
183 | if ((l = write(rt_sock, (char *)&msg, l)) < 0) { | |
1cb97af4 | 184 | log(L_ERR "KRT: Error sending route %I/%d to kernel: %m", net->n.prefix, net->n.pxlen); |
32f95476 | 185 | return -1; |
b1a1faba | 186 | } |
32f95476 OZ |
187 | |
188 | return 0; | |
b1a1faba OF |
189 | } |
190 | ||
191 | void | |
32f95476 | 192 | krt_set_notify(struct krt_proto *p UNUSED, net *n, rte *new, rte *old) |
b1a1faba | 193 | { |
32f95476 OZ |
194 | int err = 0; |
195 | ||
b1a1faba | 196 | if (old) |
32f95476 OZ |
197 | krt_sock_send(RTM_DELETE, old); |
198 | ||
b1a1faba | 199 | if (new) |
32f95476 OZ |
200 | err = krt_sock_send(RTM_ADD, new); |
201 | ||
202 | if (err < 0) | |
203 | n->n.flags |= KRF_SYNC_ERROR; | |
204 | else | |
205 | n->n.flags &= ~KRF_SYNC_ERROR; | |
b1a1faba OF |
206 | } |
207 | ||
282997f2 OF |
208 | static int |
209 | krt_set_hook(sock *sk, int size UNUSED) | |
210 | { | |
211 | struct ks_msg msg; | |
212 | int l = read(sk->fd, (char *)&msg, sizeof(msg)); | |
213 | ||
214 | if(l <= 0) | |
215 | log(L_ERR "krt-sock: read failed"); | |
216 | else | |
217 | krt_read_msg((struct proto *)sk->data, &msg, 0); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
b1a1faba | 222 | void |
19d9e303 | 223 | krt_set_start(struct krt_proto *x, int first UNUSED) |
b1a1faba OF |
224 | { |
225 | sock *sk_rt; | |
226 | static int ks_open_tried = 0; | |
227 | ||
228 | if (ks_open_tried) | |
229 | return; | |
230 | ||
231 | ks_open_tried = 1; | |
232 | ||
233 | DBG("KRT: Opening kernel socket\n"); | |
234 | ||
235 | if( (rt_sock = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) < 0) | |
236 | die("Cannot open kernel socket for routes"); | |
237 | ||
238 | sk_rt = sk_new(krt_pool); | |
239 | sk_rt->type = SK_MAGIC; | |
240 | sk_rt->rx_hook = krt_set_hook; | |
241 | sk_rt->fd = rt_sock; | |
242 | sk_rt->data = x; | |
243 | if (sk_open(sk_rt)) | |
a8bb459a | 244 | bug("krt-sock: sk_open failed"); |
b1a1faba OF |
245 | } |
246 | ||
ff2857b0 OZ |
247 | #define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0) |
248 | ||
282997f2 | 249 | static void |
b1a1faba OF |
250 | krt_read_rt(struct ks_msg *msg, struct krt_proto *p, int scan) |
251 | { | |
b1a1faba OF |
252 | rte *e; |
253 | net *net; | |
ff2857b0 | 254 | sockaddr dst, gate, mask; |
b1a1faba OF |
255 | ip_addr idst, igate, imask; |
256 | void *body = (char *)msg->buf; | |
257 | int new = (msg->rtm.rtm_type == RTM_ADD); | |
ff2857b0 | 258 | char *errmsg = "KRT: Invalid route received"; |
b1a1faba OF |
259 | int flags = msg->rtm.rtm_flags; |
260 | int addrs = msg->rtm.rtm_addrs; | |
72aed1a0 OZ |
261 | int src; |
262 | byte src2; | |
b1a1faba | 263 | |
ff2857b0 OZ |
264 | if (!(flags & RTF_UP) && scan) |
265 | SKIP("not up in scan\n"); | |
b1a1faba | 266 | |
ff2857b0 OZ |
267 | if (!(flags & RTF_DONE) && !scan) |
268 | SKIP("not done in async\n"); | |
b1a1faba | 269 | |
ff2857b0 OZ |
270 | if (flags & RTF_LLINFO) |
271 | SKIP("link-local\n"); | |
b1a1faba | 272 | |
ff2857b0 OZ |
273 | GETADDR(&dst, RTA_DST); |
274 | GETADDR(&gate, RTA_GATEWAY); | |
275 | GETADDR(&mask, RTA_NETMASK); | |
b1a1faba | 276 | |
ff2857b0 | 277 | if (sa_family_check(&dst)) |
d7f469c1 | 278 | get_sockaddr(&dst, &idst, NULL, NULL, 0); |
ff2857b0 OZ |
279 | else |
280 | SKIP("invalid DST"); | |
b1a1faba | 281 | |
ff2857b0 OZ |
282 | /* We will check later whether we have valid gateway addr */ |
283 | if (sa_family_check(&gate)) | |
d7f469c1 | 284 | get_sockaddr(&gate, &igate, NULL, NULL, 0); |
ff2857b0 OZ |
285 | else |
286 | igate = IPA_NONE; | |
b1a1faba | 287 | |
ff2857b0 OZ |
288 | /* We do not test family for RTA_NETMASK, because BSD sends us |
289 | some strange values, but interpreting them as IPv4/IPv6 works */ | |
d7f469c1 | 290 | get_sockaddr(&mask, &imask, NULL, NULL, 0); |
b1a1faba | 291 | |
ff2857b0 OZ |
292 | int c = ipa_classify_net(idst); |
293 | if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) | |
294 | SKIP("strange class/scope\n"); | |
b1a1faba | 295 | |
ff2857b0 OZ |
296 | int pxlen = (flags & RTF_HOST) ? MAX_PREFIX_LENGTH : ipa_mklen(imask); |
297 | if (pxlen < 0) | |
298 | { log(L_ERR "%s (%I) - netmask %I", errmsg, idst, imask); return; } | |
b1a1faba | 299 | |
ff2857b0 OZ |
300 | if ((flags & RTF_GATEWAY) && ipa_zero(igate)) |
301 | { log(L_ERR "%s (%I/%d) - missing gateway", errmsg, idst, pxlen); return; } | |
302 | ||
303 | u32 self_mask = RTF_PROTO1; | |
a9f380fe | 304 | u32 alien_mask = RTF_STATIC | RTF_PROTO1 | RTF_GATEWAY; |
ff2857b0 | 305 | |
72aed1a0 OZ |
306 | src2 = (flags & RTF_STATIC) ? 1 : 0; |
307 | src2 |= (flags & RTF_PROTO1) ? 2 : 0; | |
308 | ||
ff2857b0 OZ |
309 | #ifdef RTF_PROTO2 |
310 | alien_mask |= RTF_PROTO2; | |
72aed1a0 | 311 | src2 |= (flags & RTF_PROTO2) ? 4 : 0; |
ff2857b0 | 312 | #endif |
b1a1faba | 313 | |
ff2857b0 OZ |
314 | #ifdef RTF_PROTO3 |
315 | alien_mask |= RTF_PROTO3; | |
72aed1a0 | 316 | src2 |= (flags & RTF_PROTO3) ? 8 : 0; |
ff2857b0 OZ |
317 | #endif |
318 | ||
a9f380fe OZ |
319 | #ifdef RTF_REJECT |
320 | alien_mask |= RTF_REJECT; | |
321 | #endif | |
322 | ||
323 | #ifdef RTF_BLACKHOLE | |
324 | alien_mask |= RTF_BLACKHOLE; | |
325 | #endif | |
326 | ||
ff2857b0 OZ |
327 | if (flags & (RTF_DYNAMIC | RTF_MODIFIED)) |
328 | src = KRT_SRC_REDIRECT; | |
329 | else if (flags & self_mask) | |
330 | { | |
331 | if (!scan) | |
332 | SKIP("echo\n"); | |
333 | src = KRT_SRC_BIRD; | |
334 | } | |
335 | else if (flags & alien_mask) | |
336 | src = KRT_SRC_ALIEN; | |
337 | else | |
338 | src = KRT_SRC_KERNEL; | |
339 | ||
340 | net = net_get(p->p.table, idst, pxlen); | |
b1a1faba | 341 | |
cfe34a31 OZ |
342 | rta a = { |
343 | .proto = &p->p, | |
344 | .source = RTS_INHERIT, | |
345 | .scope = SCOPE_UNIVERSE, | |
346 | .cast = RTC_UNICAST | |
347 | }; | |
b1a1faba | 348 | |
ff2857b0 OZ |
349 | /* reject/blackhole routes have also set RTF_GATEWAY, |
350 | we wil check them first. */ | |
b1a1faba OF |
351 | |
352 | #ifdef RTF_REJECT | |
353 | if(flags & RTF_REJECT) { | |
354 | a.dest = RTD_UNREACHABLE; | |
ff2857b0 | 355 | goto done; |
b1a1faba OF |
356 | } |
357 | #endif | |
358 | ||
359 | #ifdef RTF_BLACKHOLE | |
360 | if(flags & RTF_BLACKHOLE) { | |
361 | a.dest = RTD_BLACKHOLE; | |
ff2857b0 | 362 | goto done; |
b1a1faba OF |
363 | } |
364 | #endif | |
365 | ||
ff2857b0 OZ |
366 | a.iface = if_find_by_index(msg->rtm.rtm_index); |
367 | if (!a.iface) | |
368 | { | |
369 | log(L_ERR "KRT: Received route %I/%d with unknown ifindex %u", | |
370 | net->n.prefix, net->n.pxlen, msg->rtm.rtm_index); | |
371 | return; | |
372 | } | |
373 | ||
374 | if (flags & RTF_GATEWAY) | |
b1a1faba | 375 | { |
ff2857b0 OZ |
376 | neighbor *ng; |
377 | a.dest = RTD_ROUTER; | |
378 | a.gw = igate; | |
b1a1faba | 379 | |
44aa101c OZ |
380 | #ifdef IPV6 |
381 | /* Clean up embedded interface ID returned in link-local address */ | |
382 | if (ipa_has_link_scope(a.gw)) | |
383 | _I0(a.gw) = 0xfe800000; | |
384 | #endif | |
385 | ||
ff2857b0 OZ |
386 | ng = neigh_find2(&p->p, &a.gw, a.iface, 0); |
387 | if (!ng || (ng->scope == SCOPE_HOST)) | |
388 | { | |
de14a7c7 OZ |
389 | /* Ignore routes with next-hop 127.0.0.1, host routes with such |
390 | next-hop appear on OpenBSD for address aliases. */ | |
391 | if (ipa_classify(a.gw) == (IADDR_HOST | SCOPE_HOST)) | |
392 | return; | |
393 | ||
ff2857b0 OZ |
394 | log(L_ERR "KRT: Received route %I/%d with strange next-hop %I", |
395 | net->n.prefix, net->n.pxlen, a.gw); | |
396 | return; | |
397 | } | |
398 | } | |
399 | else | |
400 | a.dest = RTD_DEVICE; | |
b1a1faba | 401 | |
ff2857b0 | 402 | done: |
b1a1faba OF |
403 | e = rte_get_temp(&a); |
404 | e->net = net; | |
405 | e->u.krt.src = src; | |
72aed1a0 | 406 | e->u.krt.proto = src2; |
ff2857b0 OZ |
407 | |
408 | /* These are probably too Linux-specific */ | |
ff2857b0 | 409 | e->u.krt.type = 0; |
b1a1faba OF |
410 | e->u.krt.metric = 0; |
411 | ||
412 | if (scan) | |
413 | krt_got_route(p, e); | |
414 | else | |
415 | krt_got_route_async(p, e, new); | |
416 | } | |
417 | ||
09686693 OZ |
418 | static void |
419 | krt_read_ifannounce(struct ks_msg *msg) | |
420 | { | |
421 | struct if_announcemsghdr *ifam = (struct if_announcemsghdr *)&msg->rtm; | |
422 | ||
423 | if (ifam->ifan_what == IFAN_ARRIVAL) | |
424 | { | |
425 | /* Not enough info to create the iface, so we just trigger iface scan */ | |
426 | kif_request_scan(); | |
427 | } | |
428 | else if (ifam->ifan_what == IFAN_DEPARTURE) | |
429 | { | |
430 | struct iface *iface = if_find_by_index(ifam->ifan_index); | |
431 | ||
432 | /* Interface is destroyed */ | |
433 | if (!iface) | |
434 | { | |
435 | DBG("KRT: unknown interface (%s, #%d) going down. Ignoring\n", ifam->ifan_name, ifam->ifan_index); | |
436 | return; | |
437 | } | |
438 | ||
439 | if_delete(iface); | |
440 | } | |
441 | ||
442 | DBG("KRT: IFANNOUNCE what: %d index %d name %s\n", ifam->ifan_what, ifam->ifan_index, ifam->ifan_name); | |
443 | } | |
444 | ||
282997f2 | 445 | static void |
b1a1faba OF |
446 | krt_read_ifinfo(struct ks_msg *msg) |
447 | { | |
448 | struct if_msghdr *ifm = (struct if_msghdr *)&msg->rtm; | |
449 | void *body = (void *)(ifm + 1); | |
450 | struct sockaddr_dl *dl = NULL; | |
451 | unsigned int i; | |
732a0a25 | 452 | struct iface *iface = NULL, f = {}; |
b1a1faba | 453 | int fl = ifm->ifm_flags; |
732a0a25 | 454 | int nlen = 0; |
b1a1faba | 455 | |
d32a071d | 456 | for (i = 1; i<=RTA_IFP; i <<= 1) |
b1a1faba | 457 | { |
d32a071d | 458 | if (i & ifm->ifm_addrs) |
b1a1faba | 459 | { |
d32a071d | 460 | if (i == RTA_IFP) |
b1a1faba OF |
461 | { |
462 | dl = (struct sockaddr_dl *)body; | |
463 | break; | |
464 | } | |
d32a071d | 465 | body += ROUNDUP(((struct sockaddr *)&(body))->sa_len); |
b1a1faba OF |
466 | } |
467 | } | |
468 | ||
732a0a25 | 469 | if (dl && (dl->sdl_family != AF_LINK)) |
b1a1faba | 470 | { |
09686693 | 471 | log(L_WARN "Ignoring strange IFINFO"); |
b1a1faba OF |
472 | return; |
473 | } | |
474 | ||
732a0a25 OZ |
475 | if (dl) |
476 | nlen = MIN(sizeof(f.name)-1, dl->sdl_nlen); | |
477 | ||
478 | /* Note that asynchronous IFINFO messages do not contain iface | |
479 | name, so we have to found an existing iface by iface index */ | |
b1a1faba | 480 | |
732a0a25 OZ |
481 | iface = if_find_by_index(ifm->ifm_index); |
482 | if (!iface) | |
b1a1faba OF |
483 | { |
484 | /* New interface */ | |
732a0a25 OZ |
485 | if (!dl) |
486 | return; /* No interface name, ignoring */ | |
dad7ee70 | 487 | |
732a0a25 OZ |
488 | memcpy(f.name, dl->sdl_data, nlen); |
489 | DBG("New interface '%s' found\n", f.name); | |
490 | } | |
491 | else if (dl && memcmp(iface->name, dl->sdl_data, nlen)) | |
492 | { | |
493 | /* Interface renamed */ | |
494 | if_delete(iface); | |
495 | memcpy(f.name, dl->sdl_data, nlen); | |
b1a1faba OF |
496 | } |
497 | else | |
498 | { | |
732a0a25 OZ |
499 | /* Old interface */ |
500 | memcpy(f.name, iface->name, sizeof(f.name)); | |
b1a1faba OF |
501 | } |
502 | ||
732a0a25 | 503 | f.index = ifm->ifm_index; |
b1a1faba | 504 | f.mtu = ifm->ifm_data.ifi_mtu; |
b1a1faba OF |
505 | |
506 | if (fl & IFF_UP) | |
f25cb0ef OZ |
507 | f.flags |= IF_ADMIN_UP; |
508 | if (ifm->ifm_data.ifi_link_state != LINK_STATE_DOWN) | |
509 | f.flags |= IF_LINK_UP; /* up or unknown */ | |
b1a1faba OF |
510 | if (fl & IFF_LOOPBACK) /* Loopback */ |
511 | f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE; | |
512 | else if (fl & IFF_POINTOPOINT) /* PtP */ | |
513 | f.flags |= IF_MULTICAST; | |
514 | else if (fl & IFF_BROADCAST) /* Broadcast */ | |
515 | f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST; | |
516 | else | |
517 | f.flags |= IF_MULTIACCESS; /* NBMA */ | |
518 | ||
b573755d | 519 | if_update(&f); |
b1a1faba OF |
520 | } |
521 | ||
282997f2 | 522 | static void |
b1a1faba OF |
523 | krt_read_addr(struct ks_msg *msg) |
524 | { | |
525 | struct ifa_msghdr *ifam = (struct ifa_msghdr *)&msg->rtm; | |
526 | void *body = (void *)(ifam + 1); | |
527 | sockaddr addr, mask, brd; | |
b1a1faba OF |
528 | struct iface *iface = NULL; |
529 | struct ifa ifa; | |
530 | struct sockaddr null; | |
531 | ip_addr iaddr, imask, ibrd; | |
532 | int addrs = ifam->ifam_addrs; | |
533 | int scope, masklen = -1; | |
534 | int new = (ifam->ifam_type == RTM_NEWADDR); | |
b1a1faba | 535 | |
ff2857b0 OZ |
536 | /* Strange messages with zero (invalid) ifindex appear on OpenBSD */ |
537 | if (ifam->ifam_index == 0) | |
538 | return; | |
539 | ||
b1a1faba OF |
540 | if(!(iface = if_find_by_index(ifam->ifam_index))) |
541 | { | |
542 | log(L_ERR "KIF: Received address message for unknown interface %d", ifam->ifam_index); | |
543 | return; | |
544 | } | |
545 | ||
546 | GETADDR (&null, RTA_DST); | |
547 | GETADDR (&null, RTA_GATEWAY); | |
548 | GETADDR (&mask, RTA_NETMASK); | |
549 | GETADDR (&null, RTA_GENMASK); | |
550 | GETADDR (&null, RTA_IFP); | |
551 | GETADDR (&addr, RTA_IFA); | |
552 | GETADDR (&null, RTA_AUTHOR); | |
553 | GETADDR (&brd, RTA_BRD); | |
554 | ||
ff2857b0 OZ |
555 | /* Some other family address */ |
556 | if (!sa_family_check(&addr)) | |
557 | return; | |
b1a1faba | 558 | |
d7f469c1 OZ |
559 | get_sockaddr(&addr, &iaddr, NULL, NULL, 0); |
560 | get_sockaddr(&mask, &imask, NULL, NULL, 0); | |
561 | get_sockaddr(&brd, &ibrd, NULL, NULL, 0); | |
b1a1faba OF |
562 | |
563 | if ((masklen = ipa_mklen(imask)) < 0) | |
564 | { | |
565 | log("Invalid masklen"); | |
566 | return; | |
567 | } | |
568 | ||
b88a1d40 | 569 | bzero(&ifa, sizeof(ifa)); |
b1a1faba OF |
570 | |
571 | ifa.iface = iface; | |
572 | ||
573 | memcpy(&ifa.ip, &iaddr, sizeof(ip_addr)); | |
574 | ifa.pxlen = masklen; | |
575 | memcpy(&ifa.brd, &ibrd, sizeof(ip_addr)); | |
576 | ||
577 | scope = ipa_classify(ifa.ip); | |
b1a1faba OF |
578 | if (scope < 0) |
579 | { | |
580 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, iface->name); | |
581 | return; | |
582 | } | |
583 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
584 | ||
44aa101c OZ |
585 | #ifdef IPV6 |
586 | /* Clean up embedded interface ID returned in link-local address */ | |
587 | if (ipa_has_link_scope(ifa.ip)) | |
97ab4c34 | 588 | _I0(ifa.ip) = 0xfe800000; |
44aa101c | 589 | #endif |
97ab4c34 | 590 | |
3f584374 OZ |
591 | #ifdef IPV6 |
592 | /* Why not the same check also for IPv4? */ | |
593 | if ((iface->flags & IF_MULTIACCESS) || (masklen != BITS_PER_IP_ADDRESS)) | |
594 | #else | |
afa9f66c | 595 | if (iface->flags & IF_MULTIACCESS) |
3f584374 | 596 | #endif |
ba321706 | 597 | { |
afa9f66c | 598 | ifa.prefix = ipa_and(ifa.ip, ipa_mkmask(masklen)); |
ba321706 | 599 | |
52a43ae3 OZ |
600 | if (masklen == BITS_PER_IP_ADDRESS) |
601 | ifa.flags |= IA_HOST; | |
602 | ||
9b061f7e | 603 | if (masklen == (BITS_PER_IP_ADDRESS - 1)) |
ba321706 OZ |
604 | ifa.opposite = ipa_opposite_m1(ifa.ip); |
605 | ||
606 | #ifndef IPV6 | |
9b061f7e | 607 | if (masklen == (BITS_PER_IP_ADDRESS - 2)) |
ba321706 OZ |
608 | ifa.opposite = ipa_opposite_m2(ifa.ip); |
609 | #endif | |
610 | } | |
afa9f66c OZ |
611 | else /* PtP iface */ |
612 | { | |
52a43ae3 | 613 | ifa.flags |= IA_PEER; |
afa9f66c OZ |
614 | ifa.prefix = ifa.opposite = ifa.brd; |
615 | } | |
616 | ||
b1a1faba OF |
617 | if (new) |
618 | ifa_update(&ifa); | |
619 | else | |
620 | ifa_delete(&ifa); | |
621 | } | |
622 | ||
623 | ||
624 | void | |
625 | krt_read_msg(struct proto *p, struct ks_msg *msg, int scan) | |
626 | { | |
627 | switch (msg->rtm.rtm_type) | |
628 | { | |
629 | case RTM_GET: | |
630 | if(!scan) return; | |
631 | case RTM_ADD: | |
632 | case RTM_DELETE: | |
b1a1faba OF |
633 | krt_read_rt(msg, (struct krt_proto *)p, scan); |
634 | break; | |
09686693 OZ |
635 | case RTM_IFANNOUNCE: |
636 | krt_read_ifannounce(msg); | |
637 | break; | |
b1a1faba | 638 | case RTM_IFINFO: |
b1a1faba OF |
639 | krt_read_ifinfo(msg); |
640 | break; | |
641 | case RTM_NEWADDR: | |
642 | case RTM_DELADDR: | |
b1a1faba OF |
643 | krt_read_addr(msg); |
644 | break; | |
b1a1faba | 645 | default: |
b1a1faba OF |
646 | break; |
647 | } | |
648 | } | |
649 | ||
b1a1faba | 650 | void |
19d9e303 | 651 | krt_scan_construct(struct krt_config *c UNUSED) |
b1a1faba OF |
652 | { |
653 | } | |
654 | ||
655 | void | |
19d9e303 | 656 | krt_scan_preconfig(struct config *c UNUSED) |
b1a1faba OF |
657 | { |
658 | } | |
659 | ||
660 | void | |
19d9e303 | 661 | krt_scan_postconfig(struct krt_config *c UNUSED) |
b1a1faba OF |
662 | { |
663 | } | |
664 | ||
665 | void | |
19d9e303 | 666 | krt_scan_start(struct krt_proto *x, int first UNUSED) |
b1a1faba OF |
667 | { |
668 | init_list(&x->scan.temp_ifs); | |
669 | } | |
670 | ||
671 | void | |
19d9e303 | 672 | krt_scan_shutdown(struct krt_proto *x UNUSED, int last UNUSED) |
b1a1faba OF |
673 | { |
674 | } | |
675 | ||
282997f2 | 676 | static void |
80f0d676 | 677 | krt_sysctl_scan(struct proto *p, pool *pool, byte **buf, size_t *bl, int cmd) |
b1a1faba OF |
678 | { |
679 | byte *next; | |
4aef102b | 680 | int mib[6]; |
80f0d676 | 681 | size_t obl, needed; |
b1a1faba | 682 | struct ks_msg *m; |
4aef102b | 683 | int retries = 3; |
b1a1faba OF |
684 | |
685 | mib[0] = CTL_NET; | |
686 | mib[1] = PF_ROUTE; | |
687 | mib[2] = 0; | |
688 | mib[3] = BIRD_PF; | |
689 | mib[4] = cmd; | |
690 | mib[5] = 0; | |
691 | ||
4aef102b | 692 | try: |
ff2857b0 | 693 | if (sysctl(mib, 6 , NULL , &needed, NULL, 0) < 0) |
4aef102b | 694 | die("krt_sysctl_scan 1: %m"); |
b1a1faba OF |
695 | |
696 | obl = *bl; | |
697 | ||
ff2857b0 OZ |
698 | while (needed > *bl) *bl *= 2; |
699 | while (needed < (*bl/2)) *bl /= 2; | |
b1a1faba | 700 | |
ff2857b0 | 701 | if ((obl!=*bl) || !*buf) |
b1a1faba | 702 | { |
ff2857b0 OZ |
703 | if (*buf) mb_free(*buf); |
704 | if ((*buf = mb_alloc(pool, *bl)) == NULL) die("RT scan buf alloc"); | |
b1a1faba OF |
705 | } |
706 | ||
ff2857b0 | 707 | if (sysctl(mib, 6 , *buf, &needed, NULL, 0) < 0) |
b1a1faba | 708 | { |
4aef102b OZ |
709 | if (errno == ENOMEM) |
710 | { | |
711 | /* The buffer size changed since last sysctl ('needed' is not changed) */ | |
712 | if (retries--) | |
713 | goto try; | |
714 | ||
715 | log(L_ERR "KRT: Route scan failed"); | |
716 | return; | |
717 | } | |
718 | die("krt_sysctl_scan 2: %m"); | |
b1a1faba OF |
719 | } |
720 | ||
721 | for (next = *buf; next < (*buf + needed); next += m->rtm.rtm_msglen) | |
722 | { | |
723 | m = (struct ks_msg *)next; | |
724 | krt_read_msg(p, m, 1); | |
725 | } | |
726 | } | |
727 | ||
ff2857b0 OZ |
728 | static byte *krt_buffer = NULL; |
729 | static byte *kif_buffer = NULL; | |
730 | static size_t krt_buflen = 32768; | |
731 | static size_t kif_buflen = 4096; | |
732 | ||
b1a1faba OF |
733 | void |
734 | krt_scan_fire(struct krt_proto *p) | |
735 | { | |
ff2857b0 | 736 | krt_sysctl_scan((struct proto *)p, p->krt_pool, &krt_buffer, &krt_buflen, NET_RT_DUMP); |
b1a1faba OF |
737 | } |
738 | ||
739 | void | |
740 | krt_if_scan(struct kif_proto *p) | |
741 | { | |
b1a1faba OF |
742 | struct proto *P = (struct proto *)p; |
743 | if_start_update(); | |
ff2857b0 | 744 | krt_sysctl_scan(P, P->pool, &kif_buffer, &kif_buflen, NET_RT_IFLIST); |
b1a1faba OF |
745 | if_end_update(); |
746 | } | |
747 | ||
748 | ||
749 | void | |
19d9e303 | 750 | krt_set_construct(struct krt_config *c UNUSED) |
b1a1faba OF |
751 | { |
752 | } | |
753 | ||
754 | void | |
19d9e303 | 755 | krt_set_shutdown(struct krt_proto *x UNUSED, int last UNUSED) |
b1a1faba | 756 | { |
a209d5d8 OZ |
757 | if (!krt_buffer) |
758 | return; | |
759 | ||
760 | mb_free(krt_buffer); | |
ff2857b0 OZ |
761 | krt_buffer = NULL; |
762 | } | |
b1a1faba OF |
763 | |
764 | void | |
765 | krt_if_io_init(void) | |
766 | { | |
767 | } | |
768 | ||
769 | void | |
19d9e303 | 770 | krt_if_construct(struct kif_config *c UNUSED) |
b1a1faba OF |
771 | { |
772 | } | |
773 | ||
774 | void | |
19d9e303 | 775 | krt_if_start(struct kif_proto *p UNUSED) |
b1a1faba OF |
776 | { |
777 | } | |
778 | ||
779 | void | |
19d9e303 | 780 | krt_if_shutdown(struct kif_proto *p UNUSED) |
b1a1faba | 781 | { |
a209d5d8 OZ |
782 | if (!kif_buffer) |
783 | return; | |
784 | ||
ff2857b0 OZ |
785 | mb_free(kif_buffer); |
786 | kif_buffer = NULL; | |
b1a1faba OF |
787 | } |
788 |