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Commit | Line | Data |
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95616c82 OZ |
1 | /* |
2 | * BIRD -- Linux Netlink Interface | |
3 | * | |
4 | * (c) 1999--2000 Martin Mares <mj@ucw.cz> | |
5 | * | |
6 | * Can be freely distributed and used under the terms of the GNU GPL. | |
7 | */ | |
8 | ||
9 | #include <stdio.h> | |
f83ce94d | 10 | #include <unistd.h> |
95616c82 OZ |
11 | #include <fcntl.h> |
12 | #include <sys/socket.h> | |
13 | #include <sys/uio.h> | |
14 | #include <errno.h> | |
15 | ||
16 | #undef LOCAL_DEBUG | |
17 | ||
18 | #include "nest/bird.h" | |
19 | #include "nest/route.h" | |
20 | #include "nest/protocol.h" | |
21 | #include "nest/iface.h" | |
22 | #include "lib/alloca.h" | |
23 | #include "lib/timer.h" | |
24 | #include "lib/unix.h" | |
25 | #include "lib/krt.h" | |
26 | #include "lib/socket.h" | |
27 | #include "lib/string.h" | |
9ddbfbdd | 28 | #include "lib/hash.h" |
95616c82 OZ |
29 | #include "conf/conf.h" |
30 | ||
31 | #include <asm/types.h> | |
32 | #include <linux/if.h> | |
33 | #include <linux/netlink.h> | |
34 | #include <linux/rtnetlink.h> | |
35 | ||
9ddbfbdd | 36 | |
95616c82 OZ |
37 | #ifndef MSG_TRUNC /* Hack: Several versions of glibc miss this one :( */ |
38 | #define MSG_TRUNC 0x20 | |
39 | #endif | |
40 | ||
41 | #ifndef IFF_LOWER_UP | |
42 | #define IFF_LOWER_UP 0x10000 | |
43 | #endif | |
44 | ||
9ddbfbdd JMM |
45 | #ifndef RTA_TABLE |
46 | #define RTA_TABLE 15 | |
47 | #endif | |
48 | ||
49 | ||
95616c82 OZ |
50 | /* |
51 | * Synchronous Netlink interface | |
52 | */ | |
53 | ||
54 | struct nl_sock | |
55 | { | |
56 | int fd; | |
57 | u32 seq; | |
58 | byte *rx_buffer; /* Receive buffer */ | |
59 | struct nlmsghdr *last_hdr; /* Recently received packet */ | |
ae80a2de | 60 | uint last_size; |
95616c82 OZ |
61 | }; |
62 | ||
63 | #define NL_RX_SIZE 8192 | |
64 | ||
65 | static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */ | |
66 | static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */ | |
67 | ||
68 | static void | |
69 | nl_open_sock(struct nl_sock *nl) | |
70 | { | |
71 | if (nl->fd < 0) | |
72 | { | |
73 | nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
74 | if (nl->fd < 0) | |
75 | die("Unable to open rtnetlink socket: %m"); | |
76 | nl->seq = now; | |
77 | nl->rx_buffer = xmalloc(NL_RX_SIZE); | |
78 | nl->last_hdr = NULL; | |
79 | nl->last_size = 0; | |
80 | } | |
81 | } | |
82 | ||
83 | static void | |
84 | nl_open(void) | |
85 | { | |
86 | nl_open_sock(&nl_scan); | |
87 | nl_open_sock(&nl_req); | |
88 | } | |
89 | ||
90 | static void | |
91 | nl_send(struct nl_sock *nl, struct nlmsghdr *nh) | |
92 | { | |
93 | struct sockaddr_nl sa; | |
94 | ||
95 | memset(&sa, 0, sizeof(sa)); | |
96 | sa.nl_family = AF_NETLINK; | |
97 | nh->nlmsg_pid = 0; | |
98 | nh->nlmsg_seq = ++(nl->seq); | |
99 | if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0) | |
100 | die("rtnetlink sendto: %m"); | |
101 | nl->last_hdr = NULL; | |
102 | } | |
103 | ||
104 | static void | |
86c3eea0 | 105 | nl_request_dump(int af, int cmd) |
95616c82 OZ |
106 | { |
107 | struct { | |
108 | struct nlmsghdr nh; | |
109 | struct rtgenmsg g; | |
641172c6 OZ |
110 | } req = { |
111 | .nh.nlmsg_type = cmd, | |
112 | .nh.nlmsg_len = sizeof(req), | |
113 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, | |
114 | .g.rtgen_family = af | |
115 | }; | |
95616c82 OZ |
116 | nl_send(&nl_scan, &req.nh); |
117 | } | |
118 | ||
119 | static struct nlmsghdr * | |
120 | nl_get_reply(struct nl_sock *nl) | |
121 | { | |
122 | for(;;) | |
123 | { | |
124 | if (!nl->last_hdr) | |
125 | { | |
126 | struct iovec iov = { nl->rx_buffer, NL_RX_SIZE }; | |
127 | struct sockaddr_nl sa; | |
128 | struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 }; | |
129 | int x = recvmsg(nl->fd, &m, 0); | |
130 | if (x < 0) | |
131 | die("nl_get_reply: %m"); | |
132 | if (sa.nl_pid) /* It isn't from the kernel */ | |
133 | { | |
134 | DBG("Non-kernel packet\n"); | |
135 | continue; | |
136 | } | |
137 | nl->last_size = x; | |
138 | nl->last_hdr = (void *) nl->rx_buffer; | |
139 | if (m.msg_flags & MSG_TRUNC) | |
140 | bug("nl_get_reply: got truncated reply which should be impossible"); | |
141 | } | |
142 | if (NLMSG_OK(nl->last_hdr, nl->last_size)) | |
143 | { | |
144 | struct nlmsghdr *h = nl->last_hdr; | |
145 | nl->last_hdr = NLMSG_NEXT(h, nl->last_size); | |
146 | if (h->nlmsg_seq != nl->seq) | |
147 | { | |
148 | log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)", | |
149 | h->nlmsg_seq, nl->seq); | |
150 | continue; | |
151 | } | |
152 | return h; | |
153 | } | |
154 | if (nl->last_size) | |
155 | log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size); | |
156 | nl->last_hdr = NULL; | |
157 | } | |
158 | } | |
159 | ||
1123e707 | 160 | static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS; |
95616c82 OZ |
161 | |
162 | static int | |
163 | nl_error(struct nlmsghdr *h) | |
164 | { | |
165 | struct nlmsgerr *e; | |
166 | int ec; | |
167 | ||
168 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
169 | { | |
170 | log(L_WARN "Netlink: Truncated error message received"); | |
171 | return ENOBUFS; | |
172 | } | |
173 | e = (struct nlmsgerr *) NLMSG_DATA(h); | |
174 | ec = -e->error; | |
175 | if (ec) | |
176 | log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec)); | |
177 | return ec; | |
178 | } | |
179 | ||
180 | static struct nlmsghdr * | |
181 | nl_get_scan(void) | |
182 | { | |
183 | struct nlmsghdr *h = nl_get_reply(&nl_scan); | |
184 | ||
185 | if (h->nlmsg_type == NLMSG_DONE) | |
186 | return NULL; | |
187 | if (h->nlmsg_type == NLMSG_ERROR) | |
188 | { | |
189 | nl_error(h); | |
190 | return NULL; | |
191 | } | |
192 | return h; | |
193 | } | |
194 | ||
195 | static int | |
196 | nl_exchange(struct nlmsghdr *pkt) | |
197 | { | |
198 | struct nlmsghdr *h; | |
199 | ||
200 | nl_send(&nl_req, pkt); | |
201 | for(;;) | |
202 | { | |
203 | h = nl_get_reply(&nl_req); | |
204 | if (h->nlmsg_type == NLMSG_ERROR) | |
205 | break; | |
206 | log(L_WARN "nl_exchange: Unexpected reply received"); | |
207 | } | |
208 | return nl_error(h) ? -1 : 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Netlink attributes | |
213 | */ | |
214 | ||
215 | static int nl_attr_len; | |
216 | ||
217 | static void * | |
218 | nl_checkin(struct nlmsghdr *h, int lsize) | |
219 | { | |
220 | nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize); | |
221 | if (nl_attr_len < 0) | |
222 | { | |
223 | log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len); | |
224 | return NULL; | |
225 | } | |
226 | return NLMSG_DATA(h); | |
227 | } | |
228 | ||
ad276157 JMM |
229 | struct nl_want_attrs { |
230 | u8 defined:1; | |
231 | u8 checksize:1; | |
232 | u8 size; | |
233 | }; | |
234 | ||
235 | ||
236 | #define BIRD_IFLA_MAX (IFLA_WIRELESS+1) | |
237 | ||
238 | static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = { | |
239 | [IFLA_IFNAME] = { 1, 0, 0 }, | |
240 | [IFLA_MTU] = { 1, 1, sizeof(u32) }, | |
241 | [IFLA_WIRELESS] = { 1, 0, 0 }, | |
242 | }; | |
243 | ||
244 | ||
245 | #define BIRD_IFA_MAX (IFA_ANYCAST+1) | |
246 | ||
247 | #ifndef IPV6 | |
248 | static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = { | |
249 | [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) }, | |
250 | [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) }, | |
251 | [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) }, | |
252 | }; | |
253 | #else | |
254 | static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = { | |
255 | [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) }, | |
256 | [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) }, | |
257 | }; | |
258 | #endif | |
259 | ||
260 | ||
261 | #define BIRD_RTA_MAX (RTA_TABLE+1) | |
262 | ||
263 | static struct nl_want_attrs mpnh_attr_want4[BIRD_RTA_MAX] = { | |
264 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
265 | }; | |
266 | ||
267 | #ifndef IPV6 | |
268 | static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = { | |
269 | [RTA_DST] = { 1, 1, sizeof(ip4_addr) }, | |
270 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
271 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
272 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
273 | [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) }, | |
274 | [RTA_METRICS] = { 1, 0, 0 }, | |
275 | [RTA_MULTIPATH] = { 1, 0, 0 }, | |
276 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
277 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
278 | }; | |
279 | #else | |
280 | static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = { | |
281 | [RTA_DST] = { 1, 1, sizeof(ip6_addr) }, | |
282 | [RTA_IIF] = { 1, 1, sizeof(u32) }, | |
283 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
284 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, | |
285 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
286 | [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) }, | |
287 | [RTA_METRICS] = { 1, 0, 0 }, | |
288 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
289 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
290 | }; | |
291 | #endif | |
292 | ||
293 | ||
95616c82 | 294 | static int |
ad276157 | 295 | nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize) |
95616c82 OZ |
296 | { |
297 | int max = ksize / sizeof(struct rtattr *); | |
298 | bzero(k, ksize); | |
ad276157 JMM |
299 | |
300 | for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len)) | |
95616c82 | 301 | { |
ad276157 JMM |
302 | if ((a->rta_type >= max) || !want[a->rta_type].defined) |
303 | continue; | |
304 | ||
305 | if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size)) | |
306 | { | |
307 | log(L_ERR "nl_parse_attrs: Malformed message received"); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | k[a->rta_type] = a; | |
95616c82 | 312 | } |
ad276157 | 313 | |
95616c82 OZ |
314 | if (nl_attr_len) |
315 | { | |
316 | log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len); | |
317 | return 0; | |
318 | } | |
ad276157 JMM |
319 | |
320 | return 1; | |
95616c82 OZ |
321 | } |
322 | ||
fce764f9 | 323 | static inline u32 rta_get_u32(struct rtattr *a) |
acb04cfd OZ |
324 | { return *(u32 *) RTA_DATA(a); } |
325 | ||
326 | static inline ip4_addr rta_get_ip4(struct rtattr *a) | |
327 | { return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); } | |
328 | ||
329 | static inline ip6_addr rta_get_ip6(struct rtattr *a) | |
330 | { return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); } | |
331 | ||
332 | ||
9fdf9d29 OZ |
333 | struct rtattr * |
334 | nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen) | |
95616c82 | 335 | { |
9fdf9d29 OZ |
336 | uint pos = NLMSG_ALIGN(h->nlmsg_len); |
337 | uint len = RTA_LENGTH(dlen); | |
95616c82 OZ |
338 | |
339 | if (pos + len > bufsize) | |
340 | bug("nl_add_attr: packet buffer overflow"); | |
9fdf9d29 OZ |
341 | |
342 | struct rtattr *a = (struct rtattr *)((char *)h + pos); | |
95616c82 OZ |
343 | a->rta_type = code; |
344 | a->rta_len = len; | |
345 | h->nlmsg_len = pos + len; | |
9fdf9d29 OZ |
346 | |
347 | if (dlen > 0) | |
348 | memcpy(RTA_DATA(a), data, dlen); | |
349 | ||
350 | return a; | |
95616c82 OZ |
351 | } |
352 | ||
353 | static inline void | |
354 | nl_add_attr_u32(struct nlmsghdr *h, unsigned bufsize, int code, u32 data) | |
355 | { | |
356 | nl_add_attr(h, bufsize, code, &data, 4); | |
357 | } | |
358 | ||
359 | static inline void | |
360 | nl_add_attr_ipa(struct nlmsghdr *h, unsigned bufsize, int code, ip_addr ipa) | |
361 | { | |
362 | ipa_hton(ipa); | |
363 | nl_add_attr(h, bufsize, code, &ipa, sizeof(ipa)); | |
364 | } | |
365 | ||
9fdf9d29 OZ |
366 | static inline struct rtattr * |
367 | nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code) | |
368 | { | |
369 | return nl_add_attr(h, bufsize, code, NULL, 0); | |
370 | } | |
95616c82 OZ |
371 | |
372 | static inline void | |
9fdf9d29 | 373 | nl_close_attr(struct nlmsghdr *h, struct rtattr *a) |
95616c82 | 374 | { |
9fdf9d29 | 375 | a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a; |
95616c82 OZ |
376 | } |
377 | ||
9fdf9d29 OZ |
378 | static inline struct rtnexthop * |
379 | nl_open_nexthop(struct nlmsghdr *h, uint bufsize) | |
380 | { | |
381 | uint pos = NLMSG_ALIGN(h->nlmsg_len); | |
382 | uint len = RTNH_LENGTH(0); | |
383 | ||
384 | if (pos + len > bufsize) | |
385 | bug("nl_open_nexthop: packet buffer overflow"); | |
386 | ||
387 | h->nlmsg_len = pos + len; | |
388 | ||
389 | return (void *)h + pos; | |
390 | } | |
391 | ||
392 | static inline void | |
393 | nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh) | |
394 | { | |
395 | nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh; | |
396 | } | |
95616c82 OZ |
397 | |
398 | static void | |
399 | nl_add_multipath(struct nlmsghdr *h, unsigned bufsize, struct mpnh *nh) | |
400 | { | |
9fdf9d29 OZ |
401 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH); |
402 | ||
95616c82 | 403 | for (; nh; nh = nh->next) |
9fdf9d29 OZ |
404 | { |
405 | struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize); | |
95616c82 | 406 | |
9fdf9d29 OZ |
407 | rtnh->rtnh_flags = 0; |
408 | rtnh->rtnh_hops = nh->weight; | |
409 | rtnh->rtnh_ifindex = nh->iface->index; | |
95616c82 | 410 | |
38e835de | 411 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); |
95616c82 | 412 | |
9fdf9d29 OZ |
413 | nl_close_nexthop(h, rtnh); |
414 | } | |
415 | ||
416 | nl_close_attr(h, a); | |
417 | } | |
95616c82 OZ |
418 | |
419 | static struct mpnh * | |
420 | nl_parse_multipath(struct krt_proto *p, struct rtattr *ra) | |
421 | { | |
422 | /* Temporary buffer for multicast nexthops */ | |
423 | static struct mpnh *nh_buffer; | |
424 | static int nh_buf_size; /* in number of structures */ | |
425 | static int nh_buf_used; | |
426 | ||
ad276157 | 427 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
428 | struct rtnexthop *nh = RTA_DATA(ra); |
429 | struct mpnh *rv, *first, **last; | |
430 | int len = RTA_PAYLOAD(ra); | |
431 | ||
432 | first = NULL; | |
433 | last = &first; | |
434 | nh_buf_used = 0; | |
435 | ||
436 | while (len) | |
437 | { | |
438 | /* Use RTNH_OK(nh,len) ?? */ | |
439 | if ((len < sizeof(*nh)) || (len < nh->rtnh_len)) | |
440 | return NULL; | |
441 | ||
442 | if (nh_buf_used == nh_buf_size) | |
443 | { | |
444 | nh_buf_size = nh_buf_size ? (nh_buf_size * 2) : 4; | |
445 | nh_buffer = xrealloc(nh_buffer, nh_buf_size * sizeof(struct mpnh)); | |
446 | } | |
447 | *last = rv = nh_buffer + nh_buf_used++; | |
448 | rv->next = NULL; | |
449 | last = &(rv->next); | |
450 | ||
451 | rv->weight = nh->rtnh_hops; | |
452 | rv->iface = if_find_by_index(nh->rtnh_ifindex); | |
453 | if (!rv->iface) | |
454 | return NULL; | |
455 | ||
456 | /* Nonexistent RTNH_PAYLOAD ?? */ | |
457 | nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0); | |
ad276157 | 458 | nl_parse_attrs(RTNH_DATA(nh), mpnh_attr_want4, a, sizeof(a)); |
95616c82 OZ |
459 | if (a[RTA_GATEWAY]) |
460 | { | |
95616c82 OZ |
461 | memcpy(&rv->gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ip_addr)); |
462 | ipa_ntoh(rv->gw); | |
463 | ||
464 | neighbor *ng = neigh_find2(&p->p, &rv->gw, rv->iface, | |
465 | (nh->rtnh_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0); | |
466 | if (!ng || (ng->scope == SCOPE_HOST)) | |
467 | return NULL; | |
468 | } | |
469 | else | |
470 | return NULL; | |
471 | ||
472 | len -= NLMSG_ALIGN(nh->rtnh_len); | |
473 | nh = RTNH_NEXT(nh); | |
474 | } | |
475 | ||
476 | return first; | |
477 | } | |
478 | ||
9fdf9d29 OZ |
479 | static void |
480 | nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max) | |
481 | { | |
482 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS); | |
483 | int t; | |
484 | ||
485 | for (t = 1; t < max; t++) | |
486 | if (metrics[0] & (1 << t)) | |
487 | nl_add_attr_u32(h, bufsize, t, metrics[t]); | |
488 | ||
489 | nl_close_attr(h, a); | |
490 | } | |
491 | ||
492 | static int | |
493 | nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max) | |
494 | { | |
495 | struct rtattr *a = RTA_DATA(hdr); | |
496 | int len = RTA_PAYLOAD(hdr); | |
497 | ||
498 | metrics[0] = 0; | |
499 | for (; RTA_OK(a, len); a = RTA_NEXT(a, len)) | |
500 | { | |
501 | if (a->rta_type == RTA_UNSPEC) | |
502 | continue; | |
503 | ||
504 | if (a->rta_type >= max) | |
505 | continue; | |
506 | ||
507 | if (RTA_PAYLOAD(a) != 4) | |
508 | return -1; | |
509 | ||
510 | metrics[0] |= 1 << a->rta_type; | |
acb04cfd | 511 | metrics[a->rta_type] = rta_get_u32(a); |
9fdf9d29 OZ |
512 | } |
513 | ||
514 | if (len > 0) | |
515 | return -1; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
95616c82 OZ |
520 | |
521 | /* | |
522 | * Scanning of interfaces | |
523 | */ | |
524 | ||
525 | static void | |
526 | nl_parse_link(struct nlmsghdr *h, int scan) | |
527 | { | |
528 | struct ifinfomsg *i; | |
ad276157 | 529 | struct rtattr *a[BIRD_IFLA_MAX]; |
95616c82 OZ |
530 | int new = h->nlmsg_type == RTM_NEWLINK; |
531 | struct iface f = {}; | |
532 | struct iface *ifi; | |
533 | char *name; | |
534 | u32 mtu; | |
ae80a2de | 535 | uint fl; |
95616c82 | 536 | |
ad276157 | 537 | if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a))) |
95616c82 | 538 | return; |
ad276157 | 539 | if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU]) |
95616c82 | 540 | { |
ad276157 JMM |
541 | /* |
542 | * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come | |
543 | * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists. | |
544 | * We simply ignore all such messages with IFLA_WIRELESS without notice. | |
545 | */ | |
546 | ||
547 | if (a[IFLA_WIRELESS]) | |
548 | return; | |
549 | ||
550 | log(L_ERR "KIF: Malformed message received"); | |
95616c82 OZ |
551 | return; |
552 | } | |
ad276157 | 553 | |
95616c82 | 554 | name = RTA_DATA(a[IFLA_IFNAME]); |
acb04cfd | 555 | mtu = rta_get_u32(a[IFLA_MTU]); |
95616c82 OZ |
556 | |
557 | ifi = if_find_by_index(i->ifi_index); | |
558 | if (!new) | |
559 | { | |
560 | DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name); | |
561 | if (!ifi) | |
562 | return; | |
563 | ||
564 | if_delete(ifi); | |
565 | } | |
566 | else | |
567 | { | |
568 | DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags); | |
569 | if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1)) | |
570 | if_delete(ifi); | |
571 | ||
572 | strncpy(f.name, name, sizeof(f.name)-1); | |
573 | f.index = i->ifi_index; | |
574 | f.mtu = mtu; | |
575 | ||
576 | fl = i->ifi_flags; | |
577 | if (fl & IFF_UP) | |
578 | f.flags |= IF_ADMIN_UP; | |
579 | if (fl & IFF_LOWER_UP) | |
580 | f.flags |= IF_LINK_UP; | |
581 | if (fl & IFF_LOOPBACK) /* Loopback */ | |
582 | f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE; | |
583 | else if (fl & IFF_POINTOPOINT) /* PtP */ | |
584 | f.flags |= IF_MULTICAST; | |
585 | else if (fl & IFF_BROADCAST) /* Broadcast */ | |
586 | f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST; | |
587 | else | |
588 | f.flags |= IF_MULTIACCESS; /* NBMA */ | |
3216eb03 | 589 | |
16a3254c OZ |
590 | if (fl & IFF_MULTICAST) |
591 | f.flags |= IF_MULTICAST; | |
592 | ||
3216eb03 OZ |
593 | ifi = if_update(&f); |
594 | ||
595 | if (!scan) | |
596 | if_end_partial_update(ifi); | |
95616c82 OZ |
597 | } |
598 | } | |
599 | ||
600 | static void | |
3216eb03 | 601 | nl_parse_addr(struct nlmsghdr *h, int scan) |
95616c82 OZ |
602 | { |
603 | struct ifaddrmsg *i; | |
ad276157 | 604 | struct rtattr *a[BIRD_IFA_MAX]; |
95616c82 OZ |
605 | int new = h->nlmsg_type == RTM_NEWADDR; |
606 | struct ifa ifa; | |
607 | struct iface *ifi; | |
608 | int scope; | |
609 | ||
ad276157 | 610 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 611 | return; |
ad276157 JMM |
612 | |
613 | switch (i->ifa_family) | |
614 | { | |
615 | #ifndef IPV6 | |
616 | case AF_INET: | |
617 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a))) | |
618 | return; | |
619 | if (!a[IFA_LOCAL]) | |
620 | { | |
621 | log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)"); | |
622 | return; | |
623 | } | |
624 | break; | |
95616c82 | 625 | #else |
ad276157 JMM |
626 | case AF_INET6: |
627 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a))) | |
628 | return; | |
629 | break; | |
95616c82 | 630 | #endif |
ad276157 JMM |
631 | default: |
632 | return; | |
633 | } | |
634 | ||
635 | if (!a[IFA_ADDRESS]) | |
95616c82 | 636 | { |
ad276157 | 637 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); |
95616c82 OZ |
638 | return; |
639 | } | |
640 | ||
641 | ifi = if_find_by_index(i->ifa_index); | |
642 | if (!ifi) | |
643 | { | |
644 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
645 | return; | |
646 | } | |
647 | ||
648 | bzero(&ifa, sizeof(ifa)); | |
649 | ifa.iface = ifi; | |
650 | if (i->ifa_flags & IFA_F_SECONDARY) | |
651 | ifa.flags |= IA_SECONDARY; | |
652 | ||
653 | /* IFA_LOCAL can be unset for IPv6 interfaces */ | |
654 | memcpy(&ifa.ip, RTA_DATA(a[IFA_LOCAL] ? : a[IFA_ADDRESS]), sizeof(ifa.ip)); | |
655 | ipa_ntoh(ifa.ip); | |
656 | ifa.pxlen = i->ifa_prefixlen; | |
657 | if (i->ifa_prefixlen > BITS_PER_IP_ADDRESS) | |
658 | { | |
659 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
660 | new = 0; | |
661 | } | |
662 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS) | |
663 | { | |
664 | ip_addr addr; | |
665 | memcpy(&addr, RTA_DATA(a[IFA_ADDRESS]), sizeof(addr)); | |
666 | ipa_ntoh(addr); | |
667 | ifa.prefix = ifa.brd = addr; | |
668 | ||
669 | /* It is either a host address or a peer address */ | |
670 | if (ipa_equal(ifa.ip, addr)) | |
671 | ifa.flags |= IA_HOST; | |
672 | else | |
673 | { | |
674 | ifa.flags |= IA_PEER; | |
675 | ifa.opposite = addr; | |
676 | } | |
677 | } | |
678 | else | |
679 | { | |
680 | ip_addr netmask = ipa_mkmask(ifa.pxlen); | |
681 | ifa.prefix = ipa_and(ifa.ip, netmask); | |
682 | ifa.brd = ipa_or(ifa.ip, ipa_not(netmask)); | |
683 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 1) | |
684 | ifa.opposite = ipa_opposite_m1(ifa.ip); | |
685 | ||
686 | #ifndef IPV6 | |
687 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 2) | |
688 | ifa.opposite = ipa_opposite_m2(ifa.ip); | |
689 | ||
690 | if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST]) | |
691 | { | |
692 | ip_addr xbrd; | |
693 | memcpy(&xbrd, RTA_DATA(a[IFA_BROADCAST]), sizeof(xbrd)); | |
694 | ipa_ntoh(xbrd); | |
695 | if (ipa_equal(xbrd, ifa.prefix) || ipa_equal(xbrd, ifa.brd)) | |
696 | ifa.brd = xbrd; | |
697 | else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */ | |
698 | log(L_ERR "KIF: Invalid broadcast address %I for %s", xbrd, ifi->name); | |
699 | } | |
700 | #endif | |
701 | } | |
702 | ||
703 | scope = ipa_classify(ifa.ip); | |
704 | if (scope < 0) | |
705 | { | |
706 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
707 | return; | |
708 | } | |
709 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
710 | ||
711 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %I/%d, brd %I, opp %I\n", | |
712 | ifi->index, ifi->name, | |
713 | new ? "added" : "removed", | |
714 | ifa.ip, ifa.flags, ifa.prefix, ifa.pxlen, ifa.brd, ifa.opposite); | |
3216eb03 | 715 | |
95616c82 OZ |
716 | if (new) |
717 | ifa_update(&ifa); | |
718 | else | |
719 | ifa_delete(&ifa); | |
3216eb03 OZ |
720 | |
721 | if (!scan) | |
722 | if_end_partial_update(ifi); | |
95616c82 OZ |
723 | } |
724 | ||
725 | void | |
726 | kif_do_scan(struct kif_proto *p UNUSED) | |
727 | { | |
728 | struct nlmsghdr *h; | |
729 | ||
730 | if_start_update(); | |
731 | ||
86c3eea0 | 732 | nl_request_dump(AF_UNSPEC, RTM_GETLINK); |
95616c82 OZ |
733 | while (h = nl_get_scan()) |
734 | if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK) | |
735 | nl_parse_link(h, 1); | |
736 | else | |
737 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
738 | ||
86c3eea0 | 739 | nl_request_dump(BIRD_AF, RTM_GETADDR); |
95616c82 OZ |
740 | while (h = nl_get_scan()) |
741 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
3216eb03 | 742 | nl_parse_addr(h, 1); |
95616c82 OZ |
743 | else |
744 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
745 | ||
746 | if_end_update(); | |
747 | } | |
748 | ||
749 | /* | |
750 | * Routes | |
751 | */ | |
752 | ||
9ddbfbdd JMM |
753 | static inline u32 |
754 | krt_table_id(struct krt_proto *p) | |
755 | { | |
756 | return KRT_CF->sys.table_id; | |
757 | } | |
758 | ||
759 | static HASH(struct krt_proto) nl_table_map; | |
760 | ||
761 | #define RTH_FN(k) u32_hash(k) | |
762 | #define RTH_EQ(k1,k2) k1 == k2 | |
763 | #define RTH_KEY(p) krt_table_id(p) | |
764 | #define RTH_NEXT(p) p->sys.hash_next | |
765 | ||
766 | #define RTH_REHASH rth_rehash | |
767 | #define RTH_PARAMS /8, *2, 2, 2, 6, 20 | |
768 | ||
769 | HASH_DEFINE_REHASH_FN(RTH, struct krt_proto) | |
95616c82 OZ |
770 | |
771 | int | |
772 | krt_capable(rte *e) | |
773 | { | |
774 | rta *a = e->attrs; | |
775 | ||
776 | if (a->cast != RTC_UNICAST) | |
777 | return 0; | |
778 | ||
779 | switch (a->dest) | |
780 | { | |
781 | case RTD_ROUTER: | |
782 | case RTD_DEVICE: | |
783 | if (a->iface == NULL) | |
784 | return 0; | |
785 | case RTD_BLACKHOLE: | |
786 | case RTD_UNREACHABLE: | |
787 | case RTD_PROHIBIT: | |
788 | case RTD_MULTIPATH: | |
789 | break; | |
790 | default: | |
791 | return 0; | |
792 | } | |
793 | return 1; | |
794 | } | |
795 | ||
796 | static inline int | |
797 | nh_bufsize(struct mpnh *nh) | |
798 | { | |
799 | int rv = 0; | |
800 | for (; nh != NULL; nh = nh->next) | |
9fdf9d29 | 801 | rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr))); |
95616c82 OZ |
802 | return rv; |
803 | } | |
804 | ||
805 | static int | |
806 | nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new) | |
807 | { | |
808 | eattr *ea; | |
809 | net *net = e->net; | |
810 | rta *a = e->attrs; | |
811 | struct { | |
812 | struct nlmsghdr h; | |
813 | struct rtmsg r; | |
9fdf9d29 | 814 | char buf[128 + KRT_METRICS_MAX*8 + nh_bufsize(a->nexthops)]; |
95616c82 OZ |
815 | } r; |
816 | ||
817 | DBG("nl_send_route(%I/%d,new=%d)\n", net->n.prefix, net->n.pxlen, new); | |
818 | ||
819 | bzero(&r.h, sizeof(r.h)); | |
820 | bzero(&r.r, sizeof(r.r)); | |
821 | r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
822 | r.h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); | |
823 | r.h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_EXCL : 0); | |
824 | ||
825 | r.r.rtm_family = BIRD_AF; | |
826 | r.r.rtm_dst_len = net->n.pxlen; | |
95616c82 OZ |
827 | r.r.rtm_protocol = RTPROT_BIRD; |
828 | r.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
829 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix); | |
830 | ||
9ddbfbdd JMM |
831 | if (krt_table_id(p) < 256) |
832 | r.r.rtm_table = krt_table_id(p); | |
833 | else | |
834 | nl_add_attr_u32(&r.h, sizeof(r), RTA_TABLE, krt_table_id(p)); | |
835 | ||
78a2cc28 OZ |
836 | /* For route delete, we do not specify route attributes */ |
837 | if (!new) | |
838 | return nl_exchange(&r.h); | |
839 | ||
840 | ||
95616c82 | 841 | if (ea = ea_find(eattrs, EA_KRT_METRIC)) |
9fdf9d29 | 842 | nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, ea->u.data); |
95616c82 OZ |
843 | |
844 | if (ea = ea_find(eattrs, EA_KRT_PREFSRC)) | |
845 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); | |
846 | ||
847 | if (ea = ea_find(eattrs, EA_KRT_REALM)) | |
848 | nl_add_attr_u32(&r.h, sizeof(r), RTA_FLOW, ea->u.data); | |
849 | ||
9fdf9d29 OZ |
850 | |
851 | u32 metrics[KRT_METRICS_MAX]; | |
852 | metrics[0] = 0; | |
853 | ||
854 | struct ea_walk_state ews = { .eattrs = eattrs }; | |
855 | while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX)) | |
856 | { | |
857 | int id = ea->id - EA_KRT_METRICS; | |
858 | metrics[0] |= 1 << id; | |
859 | metrics[id] = ea->u.data; | |
860 | } | |
861 | ||
862 | if (metrics[0]) | |
863 | nl_add_metrics(&r.h, sizeof(r), metrics, KRT_METRICS_MAX); | |
864 | ||
865 | ||
95616c82 OZ |
866 | /* a->iface != NULL checked in krt_capable() for router and device routes */ |
867 | ||
868 | switch (a->dest) | |
869 | { | |
870 | case RTD_ROUTER: | |
871 | r.r.rtm_type = RTN_UNICAST; | |
872 | nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); | |
873 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw); | |
874 | break; | |
875 | case RTD_DEVICE: | |
876 | r.r.rtm_type = RTN_UNICAST; | |
877 | nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); | |
878 | break; | |
879 | case RTD_BLACKHOLE: | |
880 | r.r.rtm_type = RTN_BLACKHOLE; | |
881 | break; | |
882 | case RTD_UNREACHABLE: | |
883 | r.r.rtm_type = RTN_UNREACHABLE; | |
884 | break; | |
885 | case RTD_PROHIBIT: | |
886 | r.r.rtm_type = RTN_PROHIBIT; | |
887 | break; | |
888 | case RTD_MULTIPATH: | |
889 | r.r.rtm_type = RTN_UNICAST; | |
890 | nl_add_multipath(&r.h, sizeof(r), a->nexthops); | |
891 | break; | |
892 | default: | |
893 | bug("krt_capable inconsistent with nl_send_route"); | |
894 | } | |
895 | ||
896 | return nl_exchange(&r.h); | |
897 | } | |
898 | ||
899 | void | |
900 | krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old, struct ea_list *eattrs) | |
901 | { | |
902 | int err = 0; | |
903 | ||
904 | /* | |
905 | * NULL for eattr of the old route is a little hack, but we don't | |
906 | * get proper eattrs for old in rt_notify() anyway. NULL means no | |
907 | * extended route attributes and therefore matches if the kernel | |
908 | * route has any of them. | |
909 | */ | |
910 | ||
911 | if (old) | |
912 | nl_send_route(p, old, NULL, 0); | |
913 | ||
914 | if (new) | |
915 | err = nl_send_route(p, new, eattrs, 1); | |
916 | ||
917 | if (err < 0) | |
918 | n->n.flags |= KRF_SYNC_ERROR; | |
919 | else | |
920 | n->n.flags &= ~KRF_SYNC_ERROR; | |
921 | } | |
922 | ||
923 | ||
924 | #define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0) | |
925 | ||
926 | static void | |
927 | nl_parse_route(struct nlmsghdr *h, int scan) | |
928 | { | |
929 | struct krt_proto *p; | |
930 | struct rtmsg *i; | |
ad276157 | 931 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
932 | int new = h->nlmsg_type == RTM_NEWROUTE; |
933 | ||
934 | ip_addr dst = IPA_NONE; | |
935 | u32 oif = ~0; | |
9ddbfbdd | 936 | u32 table; |
95616c82 OZ |
937 | int src; |
938 | ||
ad276157 | 939 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 940 | return; |
ad276157 JMM |
941 | |
942 | switch (i->rtm_family) | |
95616c82 | 943 | { |
ad276157 JMM |
944 | #ifndef IPV6 |
945 | case AF_INET: | |
946 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a))) | |
947 | return; | |
948 | break; | |
949 | #else | |
950 | case AF_INET6: | |
951 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a))) | |
952 | return; | |
953 | break; | |
954 | #endif | |
955 | default: | |
956 | return; | |
95616c82 OZ |
957 | } |
958 | ||
ad276157 | 959 | |
95616c82 OZ |
960 | if (a[RTA_DST]) |
961 | { | |
962 | memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst)); | |
963 | ipa_ntoh(dst); | |
964 | } | |
965 | ||
966 | if (a[RTA_OIF]) | |
acb04cfd | 967 | oif = rta_get_u32(a[RTA_OIF]); |
95616c82 | 968 | |
9ddbfbdd JMM |
969 | if (a[RTA_TABLE]) |
970 | table = rta_get_u32(a[RTA_TABLE]); | |
971 | else | |
972 | table = i->rtm_table; | |
973 | ||
974 | p = HASH_FIND(nl_table_map, RTH, table); /* Do we know this table? */ | |
975 | DBG("KRT: Got %I/%d, type=%d, oif=%d, table=%d, prid=%d, proto=%s\n", dst, i->rtm_dst_len, i->rtm_type, oif, table, i->rtm_protocol, p ? p->p.name : "(none)"); | |
95616c82 | 976 | if (!p) |
9ddbfbdd | 977 | SKIP("unknown table %d\n", table); |
95616c82 OZ |
978 | |
979 | ||
980 | #ifdef IPV6 | |
981 | if (a[RTA_IIF]) | |
982 | SKIP("IIF set\n"); | |
983 | #else | |
984 | if (i->rtm_tos != 0) /* We don't support TOS */ | |
985 | SKIP("TOS %02x\n", i->rtm_tos); | |
986 | #endif | |
987 | ||
988 | if (scan && !new) | |
989 | SKIP("RTM_DELROUTE in scan\n"); | |
990 | ||
991 | int c = ipa_classify_net(dst); | |
992 | if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) | |
993 | SKIP("strange class/scope\n"); | |
994 | ||
995 | // ignore rtm_scope, it is not a real scope | |
996 | // if (i->rtm_scope != RT_SCOPE_UNIVERSE) | |
997 | // SKIP("scope %u\n", i->rtm_scope); | |
998 | ||
999 | switch (i->rtm_protocol) | |
1000 | { | |
1001 | case RTPROT_UNSPEC: | |
1002 | SKIP("proto unspec\n"); | |
1003 | ||
1004 | case RTPROT_REDIRECT: | |
1005 | src = KRT_SRC_REDIRECT; | |
1006 | break; | |
1007 | ||
1008 | case RTPROT_KERNEL: | |
1009 | src = KRT_SRC_KERNEL; | |
1010 | return; | |
1011 | ||
1012 | case RTPROT_BIRD: | |
1013 | if (!scan) | |
1014 | SKIP("echo\n"); | |
1015 | src = KRT_SRC_BIRD; | |
1016 | break; | |
1017 | ||
1018 | case RTPROT_BOOT: | |
1019 | default: | |
1020 | src = KRT_SRC_ALIEN; | |
1021 | } | |
1022 | ||
1023 | net *net = net_get(p->p.table, dst, i->rtm_dst_len); | |
1024 | ||
1025 | rta ra = { | |
094d2bdb | 1026 | .src= p->p.main_source, |
95616c82 OZ |
1027 | .source = RTS_INHERIT, |
1028 | .scope = SCOPE_UNIVERSE, | |
1029 | .cast = RTC_UNICAST | |
1030 | }; | |
1031 | ||
1032 | switch (i->rtm_type) | |
1033 | { | |
1034 | case RTN_UNICAST: | |
1035 | ||
ad276157 | 1036 | if (a[RTA_MULTIPATH] && (i->rtm_family == AF_INET)) |
95616c82 OZ |
1037 | { |
1038 | ra.dest = RTD_MULTIPATH; | |
1039 | ra.nexthops = nl_parse_multipath(p, a[RTA_MULTIPATH]); | |
1040 | if (!ra.nexthops) | |
1041 | { | |
1042 | log(L_ERR "KRT: Received strange multipath route %I/%d", | |
1043 | net->n.prefix, net->n.pxlen); | |
1044 | return; | |
1045 | } | |
9fdf9d29 | 1046 | |
95616c82 OZ |
1047 | break; |
1048 | } | |
1049 | ||
1050 | ra.iface = if_find_by_index(oif); | |
1051 | if (!ra.iface) | |
1052 | { | |
1053 | log(L_ERR "KRT: Received route %I/%d with unknown ifindex %u", | |
1054 | net->n.prefix, net->n.pxlen, oif); | |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | if (a[RTA_GATEWAY]) | |
1059 | { | |
1060 | neighbor *ng; | |
1061 | ra.dest = RTD_ROUTER; | |
1062 | memcpy(&ra.gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ra.gw)); | |
1063 | ipa_ntoh(ra.gw); | |
1064 | ||
9810d055 | 1065 | #ifdef IPV6 |
95616c82 OZ |
1066 | /* Silently skip strange 6to4 routes */ |
1067 | if (ipa_in_net(ra.gw, IPA_NONE, 96)) | |
1068 | return; | |
9810d055 | 1069 | #endif |
95616c82 OZ |
1070 | |
1071 | ng = neigh_find2(&p->p, &ra.gw, ra.iface, | |
1072 | (i->rtm_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0); | |
1073 | if (!ng || (ng->scope == SCOPE_HOST)) | |
1074 | { | |
1075 | log(L_ERR "KRT: Received route %I/%d with strange next-hop %I", | |
1076 | net->n.prefix, net->n.pxlen, ra.gw); | |
1077 | return; | |
1078 | } | |
1079 | } | |
1080 | else | |
1081 | { | |
1082 | ra.dest = RTD_DEVICE; | |
95616c82 OZ |
1083 | } |
1084 | ||
1085 | break; | |
1086 | case RTN_BLACKHOLE: | |
1087 | ra.dest = RTD_BLACKHOLE; | |
1088 | break; | |
1089 | case RTN_UNREACHABLE: | |
1090 | ra.dest = RTD_UNREACHABLE; | |
1091 | break; | |
1092 | case RTN_PROHIBIT: | |
1093 | ra.dest = RTD_PROHIBIT; | |
1094 | break; | |
1095 | /* FIXME: What about RTN_THROW? */ | |
1096 | default: | |
1097 | SKIP("type %d\n", i->rtm_type); | |
1098 | return; | |
1099 | } | |
1100 | ||
1101 | rte *e = rte_get_temp(&ra); | |
1102 | e->net = net; | |
1103 | e->u.krt.src = src; | |
1104 | e->u.krt.proto = i->rtm_protocol; | |
e86cfd41 OZ |
1105 | e->u.krt.seen = 0; |
1106 | e->u.krt.best = 0; | |
acb04cfd | 1107 | e->u.krt.metric = 0; |
95616c82 OZ |
1108 | |
1109 | if (a[RTA_PRIORITY]) | |
acb04cfd | 1110 | e->u.krt.metric = rta_get_u32(a[RTA_PRIORITY]); |
95616c82 OZ |
1111 | |
1112 | if (a[RTA_PREFSRC]) | |
1113 | { | |
1114 | ip_addr ps; | |
1115 | memcpy(&ps, RTA_DATA(a[RTA_PREFSRC]), sizeof(ps)); | |
1116 | ipa_ntoh(ps); | |
1117 | ||
1118 | ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr)); | |
1119 | ea->next = ra.eattrs; | |
1120 | ra.eattrs = ea; | |
1121 | ea->flags = EALF_SORTED; | |
1122 | ea->count = 1; | |
1123 | ea->attrs[0].id = EA_KRT_PREFSRC; | |
1124 | ea->attrs[0].flags = 0; | |
1125 | ea->attrs[0].type = EAF_TYPE_IP_ADDRESS; | |
1126 | ea->attrs[0].u.ptr = alloca(sizeof(struct adata) + sizeof(ps)); | |
1127 | ea->attrs[0].u.ptr->length = sizeof(ps); | |
1128 | memcpy(ea->attrs[0].u.ptr->data, &ps, sizeof(ps)); | |
1129 | } | |
1130 | ||
1131 | if (a[RTA_FLOW]) | |
1132 | { | |
1133 | ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr)); | |
1134 | ea->next = ra.eattrs; | |
1135 | ra.eattrs = ea; | |
1136 | ea->flags = EALF_SORTED; | |
1137 | ea->count = 1; | |
1138 | ea->attrs[0].id = EA_KRT_REALM; | |
1139 | ea->attrs[0].flags = 0; | |
1140 | ea->attrs[0].type = EAF_TYPE_INT; | |
acb04cfd | 1141 | ea->attrs[0].u.data = rta_get_u32(a[RTA_FLOW]); |
95616c82 OZ |
1142 | } |
1143 | ||
9fdf9d29 OZ |
1144 | if (a[RTA_METRICS]) |
1145 | { | |
1146 | u32 metrics[KRT_METRICS_MAX]; | |
1147 | ea_list *ea = alloca(sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr)); | |
1148 | int t, n = 0; | |
1149 | ||
1150 | if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0) | |
1151 | { | |
1152 | log(L_ERR "KRT: Received route %I/%d with strange RTA_METRICS attribute", | |
1153 | net->n.prefix, net->n.pxlen); | |
1154 | return; | |
1155 | } | |
1156 | ||
1157 | for (t = 1; t < KRT_METRICS_MAX; t++) | |
1158 | if (metrics[0] & (1 << t)) | |
1159 | { | |
1160 | ea->attrs[n].id = EA_CODE(EAP_KRT, KRT_METRICS_OFFSET + t); | |
1161 | ea->attrs[n].flags = 0; | |
1162 | ea->attrs[n].type = EAF_TYPE_INT; /* FIXME: Some are EAF_TYPE_BITFIELD */ | |
1163 | ea->attrs[n].u.data = metrics[t]; | |
1164 | n++; | |
1165 | } | |
1166 | ||
1167 | if (n > 0) | |
1168 | { | |
1169 | ea->next = ra.eattrs; | |
1170 | ea->flags = EALF_SORTED; | |
1171 | ea->count = n; | |
1172 | ra.eattrs = ea; | |
1173 | } | |
1174 | } | |
1175 | ||
95616c82 OZ |
1176 | if (scan) |
1177 | krt_got_route(p, e); | |
1178 | else | |
1179 | krt_got_route_async(p, e, new); | |
1180 | } | |
1181 | ||
1182 | void | |
1183 | krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */ | |
1184 | { | |
1185 | struct nlmsghdr *h; | |
1186 | ||
86c3eea0 | 1187 | nl_request_dump(BIRD_AF, RTM_GETROUTE); |
95616c82 OZ |
1188 | while (h = nl_get_scan()) |
1189 | if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE) | |
1190 | nl_parse_route(h, 1); | |
1191 | else | |
1192 | log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Asynchronous Netlink interface | |
1197 | */ | |
1198 | ||
1199 | static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */ | |
1200 | static byte *nl_async_rx_buffer; /* Receive buffer */ | |
1201 | ||
1202 | static void | |
1203 | nl_async_msg(struct nlmsghdr *h) | |
1204 | { | |
1205 | switch (h->nlmsg_type) | |
1206 | { | |
1207 | case RTM_NEWROUTE: | |
1208 | case RTM_DELROUTE: | |
1209 | DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type); | |
1210 | nl_parse_route(h, 0); | |
1211 | break; | |
1212 | case RTM_NEWLINK: | |
1213 | case RTM_DELLINK: | |
1214 | DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1215 | if (kif_proto) |
1216 | nl_parse_link(h, 0); | |
95616c82 OZ |
1217 | break; |
1218 | case RTM_NEWADDR: | |
1219 | case RTM_DELADDR: | |
1220 | DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1221 | if (kif_proto) |
1222 | nl_parse_addr(h, 0); | |
95616c82 OZ |
1223 | break; |
1224 | default: | |
1225 | DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type); | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | static int | |
1230 | nl_async_hook(sock *sk, int size UNUSED) | |
1231 | { | |
1232 | struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE }; | |
1233 | struct sockaddr_nl sa; | |
1234 | struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 }; | |
1235 | struct nlmsghdr *h; | |
1236 | int x; | |
ae80a2de | 1237 | uint len; |
95616c82 OZ |
1238 | |
1239 | x = recvmsg(sk->fd, &m, 0); | |
1240 | if (x < 0) | |
1241 | { | |
1242 | if (errno == ENOBUFS) | |
1243 | { | |
1244 | /* | |
1245 | * Netlink reports some packets have been thrown away. | |
1246 | * One day we might react to it by asking for route table | |
1247 | * scan in near future. | |
1248 | */ | |
1249 | return 1; /* More data are likely to be ready */ | |
1250 | } | |
1251 | else if (errno != EWOULDBLOCK) | |
1252 | log(L_ERR "Netlink recvmsg: %m"); | |
1253 | return 0; | |
1254 | } | |
1255 | if (sa.nl_pid) /* It isn't from the kernel */ | |
1256 | { | |
1257 | DBG("Non-kernel packet\n"); | |
1258 | return 1; | |
1259 | } | |
1260 | h = (void *) nl_async_rx_buffer; | |
1261 | len = x; | |
1262 | if (m.msg_flags & MSG_TRUNC) | |
1263 | { | |
1264 | log(L_WARN "Netlink got truncated asynchronous message"); | |
1265 | return 1; | |
1266 | } | |
1267 | while (NLMSG_OK(h, len)) | |
1268 | { | |
1269 | nl_async_msg(h); | |
1270 | h = NLMSG_NEXT(h, len); | |
1271 | } | |
1272 | if (len) | |
1273 | log(L_WARN "nl_async_hook: Found packet remnant of size %d", len); | |
1274 | return 1; | |
1275 | } | |
1276 | ||
1277 | static void | |
1278 | nl_open_async(void) | |
1279 | { | |
1280 | sock *sk; | |
1281 | struct sockaddr_nl sa; | |
1282 | int fd; | |
95616c82 | 1283 | |
f83ce94d | 1284 | if (nl_async_sk) |
95616c82 | 1285 | return; |
95616c82 OZ |
1286 | |
1287 | DBG("KRT: Opening async netlink socket\n"); | |
1288 | ||
1289 | fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
1290 | if (fd < 0) | |
1291 | { | |
1292 | log(L_ERR "Unable to open asynchronous rtnetlink socket: %m"); | |
1293 | return; | |
1294 | } | |
1295 | ||
1296 | bzero(&sa, sizeof(sa)); | |
1297 | sa.nl_family = AF_NETLINK; | |
1298 | #ifdef IPV6 | |
1299 | sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE; | |
1300 | #else | |
1301 | sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE; | |
1302 | #endif | |
1303 | if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) | |
1304 | { | |
1305 | log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m"); | |
f83ce94d | 1306 | close(fd); |
95616c82 OZ |
1307 | return; |
1308 | } | |
1309 | ||
f83ce94d OZ |
1310 | nl_async_rx_buffer = xmalloc(NL_RX_SIZE); |
1311 | ||
95616c82 OZ |
1312 | sk = nl_async_sk = sk_new(krt_pool); |
1313 | sk->type = SK_MAGIC; | |
1314 | sk->rx_hook = nl_async_hook; | |
1315 | sk->fd = fd; | |
05476c4d | 1316 | if (sk_open(sk) < 0) |
95616c82 | 1317 | bug("Netlink: sk_open failed"); |
95616c82 OZ |
1318 | } |
1319 | ||
9ddbfbdd | 1320 | |
95616c82 OZ |
1321 | /* |
1322 | * Interface to the UNIX krt module | |
1323 | */ | |
1324 | ||
95616c82 | 1325 | void |
9ddbfbdd JMM |
1326 | krt_sys_io_init(void) |
1327 | { | |
1328 | HASH_INIT(nl_table_map, krt_pool, 6); | |
1329 | } | |
1330 | ||
1331 | int | |
c6964c30 | 1332 | krt_sys_start(struct krt_proto *p) |
95616c82 | 1333 | { |
9ddbfbdd JMM |
1334 | struct krt_proto *old = HASH_FIND(nl_table_map, RTH, krt_table_id(p)); |
1335 | ||
1336 | if (old) | |
1337 | { | |
1338 | log(L_ERR "%s: Kernel table %u already registered by %s", | |
1339 | p->p.name, krt_table_id(p), old->p.name); | |
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | HASH_INSERT2(nl_table_map, RTH, krt_pool, p); | |
c6964c30 OZ |
1344 | |
1345 | nl_open(); | |
1346 | nl_open_async(); | |
9ddbfbdd JMM |
1347 | |
1348 | return 1; | |
95616c82 OZ |
1349 | } |
1350 | ||
1351 | void | |
9ddbfbdd | 1352 | krt_sys_shutdown(struct krt_proto *p) |
95616c82 | 1353 | { |
9ddbfbdd | 1354 | HASH_REMOVE2(nl_table_map, RTH, krt_pool, p); |
95616c82 OZ |
1355 | } |
1356 | ||
1357 | int | |
1358 | krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o) | |
1359 | { | |
1360 | return n->sys.table_id == o->sys.table_id; | |
1361 | } | |
1362 | ||
95616c82 OZ |
1363 | void |
1364 | krt_sys_init_config(struct krt_config *cf) | |
1365 | { | |
1366 | cf->sys.table_id = RT_TABLE_MAIN; | |
1367 | } | |
1368 | ||
1369 | void | |
1370 | krt_sys_copy_config(struct krt_config *d, struct krt_config *s) | |
1371 | { | |
1372 | d->sys.table_id = s->sys.table_id; | |
1373 | } | |
1374 | ||
9fdf9d29 OZ |
1375 | static const char *krt_metrics_names[KRT_METRICS_MAX] = { |
1376 | NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss", | |
1377 | "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack" | |
1378 | }; | |
1379 | ||
1380 | static const char *krt_features_names[KRT_FEATURES_MAX] = { | |
1381 | "ecn", NULL, NULL, "allfrag" | |
1382 | }; | |
1383 | ||
1384 | int | |
1385 | krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED) | |
1386 | { | |
1387 | switch (a->id) | |
1388 | { | |
1389 | case EA_KRT_PREFSRC: | |
1390 | bsprintf(buf, "prefsrc"); | |
1391 | return GA_NAME; | |
1392 | ||
1393 | case EA_KRT_REALM: | |
1394 | bsprintf(buf, "realm"); | |
1395 | return GA_NAME; | |
1396 | ||
1397 | case EA_KRT_LOCK: | |
1398 | buf += bsprintf(buf, "lock:"); | |
1399 | ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX); | |
1400 | return GA_FULL; | |
1401 | ||
1402 | case EA_KRT_FEATURES: | |
1403 | buf += bsprintf(buf, "features:"); | |
1404 | ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX); | |
1405 | return GA_FULL; | |
1406 | ||
1407 | default:; | |
1408 | int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET; | |
1409 | if (id > 0 && id < KRT_METRICS_MAX) | |
1410 | { | |
1411 | bsprintf(buf, "%s", krt_metrics_names[id]); | |
1412 | return GA_NAME; | |
1413 | } | |
1414 | ||
1415 | return GA_UNKNOWN; | |
1416 | } | |
1417 | } | |
1418 | ||
95616c82 OZ |
1419 | |
1420 | ||
1421 | void | |
1422 | kif_sys_start(struct kif_proto *p UNUSED) | |
1423 | { | |
1424 | nl_open(); | |
1425 | nl_open_async(); | |
1426 | } | |
1427 | ||
1428 | void | |
1429 | kif_sys_shutdown(struct kif_proto *p UNUSED) | |
1430 | { | |
1431 | } |