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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 | ||
a08a81c6 OZ |
41 | #ifndef IFA_FLAGS |
42 | #define IFA_FLAGS 8 | |
43 | #endif | |
44 | ||
95616c82 OZ |
45 | #ifndef IFF_LOWER_UP |
46 | #define IFF_LOWER_UP 0x10000 | |
47 | #endif | |
48 | ||
9ddbfbdd JMM |
49 | #ifndef RTA_TABLE |
50 | #define RTA_TABLE 15 | |
51 | #endif | |
52 | ||
53 | ||
95616c82 OZ |
54 | /* |
55 | * Synchronous Netlink interface | |
56 | */ | |
57 | ||
58 | struct nl_sock | |
59 | { | |
60 | int fd; | |
61 | u32 seq; | |
62 | byte *rx_buffer; /* Receive buffer */ | |
63 | struct nlmsghdr *last_hdr; /* Recently received packet */ | |
ae80a2de | 64 | uint last_size; |
95616c82 OZ |
65 | }; |
66 | ||
67 | #define NL_RX_SIZE 8192 | |
68 | ||
69 | static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */ | |
70 | static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */ | |
71 | ||
72 | static void | |
73 | nl_open_sock(struct nl_sock *nl) | |
74 | { | |
75 | if (nl->fd < 0) | |
76 | { | |
77 | nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
78 | if (nl->fd < 0) | |
79 | die("Unable to open rtnetlink socket: %m"); | |
80 | nl->seq = now; | |
81 | nl->rx_buffer = xmalloc(NL_RX_SIZE); | |
82 | nl->last_hdr = NULL; | |
83 | nl->last_size = 0; | |
84 | } | |
85 | } | |
86 | ||
87 | static void | |
88 | nl_open(void) | |
89 | { | |
90 | nl_open_sock(&nl_scan); | |
91 | nl_open_sock(&nl_req); | |
92 | } | |
93 | ||
94 | static void | |
95 | nl_send(struct nl_sock *nl, struct nlmsghdr *nh) | |
96 | { | |
97 | struct sockaddr_nl sa; | |
98 | ||
99 | memset(&sa, 0, sizeof(sa)); | |
100 | sa.nl_family = AF_NETLINK; | |
101 | nh->nlmsg_pid = 0; | |
102 | nh->nlmsg_seq = ++(nl->seq); | |
103 | if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0) | |
104 | die("rtnetlink sendto: %m"); | |
105 | nl->last_hdr = NULL; | |
106 | } | |
107 | ||
108 | static void | |
86c3eea0 | 109 | nl_request_dump(int af, int cmd) |
95616c82 OZ |
110 | { |
111 | struct { | |
112 | struct nlmsghdr nh; | |
113 | struct rtgenmsg g; | |
641172c6 OZ |
114 | } req = { |
115 | .nh.nlmsg_type = cmd, | |
116 | .nh.nlmsg_len = sizeof(req), | |
117 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, | |
118 | .g.rtgen_family = af | |
119 | }; | |
95616c82 OZ |
120 | nl_send(&nl_scan, &req.nh); |
121 | } | |
122 | ||
123 | static struct nlmsghdr * | |
124 | nl_get_reply(struct nl_sock *nl) | |
125 | { | |
126 | for(;;) | |
127 | { | |
128 | if (!nl->last_hdr) | |
129 | { | |
130 | struct iovec iov = { nl->rx_buffer, NL_RX_SIZE }; | |
131 | struct sockaddr_nl sa; | |
31e9e101 ST |
132 | struct msghdr m = { |
133 | .msg_name = &sa, | |
134 | .msg_namelen = sizeof(sa), | |
135 | .msg_iov = &iov, | |
136 | .msg_iovlen = 1, | |
137 | }; | |
95616c82 OZ |
138 | int x = recvmsg(nl->fd, &m, 0); |
139 | if (x < 0) | |
140 | die("nl_get_reply: %m"); | |
141 | if (sa.nl_pid) /* It isn't from the kernel */ | |
142 | { | |
143 | DBG("Non-kernel packet\n"); | |
144 | continue; | |
145 | } | |
146 | nl->last_size = x; | |
147 | nl->last_hdr = (void *) nl->rx_buffer; | |
148 | if (m.msg_flags & MSG_TRUNC) | |
149 | bug("nl_get_reply: got truncated reply which should be impossible"); | |
150 | } | |
151 | if (NLMSG_OK(nl->last_hdr, nl->last_size)) | |
152 | { | |
153 | struct nlmsghdr *h = nl->last_hdr; | |
154 | nl->last_hdr = NLMSG_NEXT(h, nl->last_size); | |
155 | if (h->nlmsg_seq != nl->seq) | |
156 | { | |
157 | log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)", | |
158 | h->nlmsg_seq, nl->seq); | |
159 | continue; | |
160 | } | |
161 | return h; | |
162 | } | |
163 | if (nl->last_size) | |
164 | log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size); | |
165 | nl->last_hdr = NULL; | |
166 | } | |
167 | } | |
168 | ||
1123e707 | 169 | static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS; |
95616c82 OZ |
170 | |
171 | static int | |
172 | nl_error(struct nlmsghdr *h) | |
173 | { | |
174 | struct nlmsgerr *e; | |
175 | int ec; | |
176 | ||
177 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
178 | { | |
179 | log(L_WARN "Netlink: Truncated error message received"); | |
180 | return ENOBUFS; | |
181 | } | |
182 | e = (struct nlmsgerr *) NLMSG_DATA(h); | |
183 | ec = -e->error; | |
184 | if (ec) | |
185 | log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec)); | |
186 | return ec; | |
187 | } | |
188 | ||
189 | static struct nlmsghdr * | |
190 | nl_get_scan(void) | |
191 | { | |
192 | struct nlmsghdr *h = nl_get_reply(&nl_scan); | |
193 | ||
194 | if (h->nlmsg_type == NLMSG_DONE) | |
195 | return NULL; | |
196 | if (h->nlmsg_type == NLMSG_ERROR) | |
197 | { | |
198 | nl_error(h); | |
199 | return NULL; | |
200 | } | |
201 | return h; | |
202 | } | |
203 | ||
204 | static int | |
205 | nl_exchange(struct nlmsghdr *pkt) | |
206 | { | |
207 | struct nlmsghdr *h; | |
208 | ||
209 | nl_send(&nl_req, pkt); | |
210 | for(;;) | |
211 | { | |
212 | h = nl_get_reply(&nl_req); | |
213 | if (h->nlmsg_type == NLMSG_ERROR) | |
214 | break; | |
215 | log(L_WARN "nl_exchange: Unexpected reply received"); | |
216 | } | |
217 | return nl_error(h) ? -1 : 0; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Netlink attributes | |
222 | */ | |
223 | ||
224 | static int nl_attr_len; | |
225 | ||
226 | static void * | |
227 | nl_checkin(struct nlmsghdr *h, int lsize) | |
228 | { | |
229 | nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize); | |
230 | if (nl_attr_len < 0) | |
231 | { | |
232 | log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len); | |
233 | return NULL; | |
234 | } | |
235 | return NLMSG_DATA(h); | |
236 | } | |
237 | ||
ad276157 JMM |
238 | struct nl_want_attrs { |
239 | u8 defined:1; | |
240 | u8 checksize:1; | |
241 | u8 size; | |
242 | }; | |
243 | ||
244 | ||
245 | #define BIRD_IFLA_MAX (IFLA_WIRELESS+1) | |
246 | ||
247 | static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = { | |
248 | [IFLA_IFNAME] = { 1, 0, 0 }, | |
249 | [IFLA_MTU] = { 1, 1, sizeof(u32) }, | |
250 | [IFLA_WIRELESS] = { 1, 0, 0 }, | |
251 | }; | |
252 | ||
253 | ||
e37d2e3e | 254 | #define BIRD_IFA_MAX (IFA_FLAGS+1) |
ad276157 JMM |
255 | |
256 | #ifndef IPV6 | |
257 | static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = { | |
258 | [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) }, | |
259 | [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) }, | |
260 | [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) }, | |
e37d2e3e | 261 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 JMM |
262 | }; |
263 | #else | |
264 | static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = { | |
265 | [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) }, | |
266 | [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) }, | |
e37d2e3e | 267 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 JMM |
268 | }; |
269 | #endif | |
270 | ||
271 | ||
272 | #define BIRD_RTA_MAX (RTA_TABLE+1) | |
273 | ||
274 | static struct nl_want_attrs mpnh_attr_want4[BIRD_RTA_MAX] = { | |
275 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
276 | }; | |
277 | ||
278 | #ifndef IPV6 | |
279 | static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = { | |
280 | [RTA_DST] = { 1, 1, sizeof(ip4_addr) }, | |
281 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
282 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
283 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
284 | [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) }, | |
285 | [RTA_METRICS] = { 1, 0, 0 }, | |
286 | [RTA_MULTIPATH] = { 1, 0, 0 }, | |
287 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
288 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
289 | }; | |
290 | #else | |
291 | static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = { | |
292 | [RTA_DST] = { 1, 1, sizeof(ip6_addr) }, | |
293 | [RTA_IIF] = { 1, 1, sizeof(u32) }, | |
294 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
295 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, | |
296 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
297 | [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) }, | |
298 | [RTA_METRICS] = { 1, 0, 0 }, | |
299 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
300 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
301 | }; | |
302 | #endif | |
303 | ||
304 | ||
95616c82 | 305 | static int |
ad276157 | 306 | nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize) |
95616c82 OZ |
307 | { |
308 | int max = ksize / sizeof(struct rtattr *); | |
309 | bzero(k, ksize); | |
ad276157 JMM |
310 | |
311 | for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len)) | |
95616c82 | 312 | { |
ad276157 JMM |
313 | if ((a->rta_type >= max) || !want[a->rta_type].defined) |
314 | continue; | |
315 | ||
316 | if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size)) | |
317 | { | |
318 | log(L_ERR "nl_parse_attrs: Malformed message received"); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | k[a->rta_type] = a; | |
95616c82 | 323 | } |
ad276157 | 324 | |
95616c82 OZ |
325 | if (nl_attr_len) |
326 | { | |
327 | log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len); | |
328 | return 0; | |
329 | } | |
ad276157 JMM |
330 | |
331 | return 1; | |
95616c82 OZ |
332 | } |
333 | ||
fce764f9 | 334 | static inline u32 rta_get_u32(struct rtattr *a) |
acb04cfd OZ |
335 | { return *(u32 *) RTA_DATA(a); } |
336 | ||
337 | static inline ip4_addr rta_get_ip4(struct rtattr *a) | |
338 | { return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); } | |
339 | ||
340 | static inline ip6_addr rta_get_ip6(struct rtattr *a) | |
341 | { return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); } | |
342 | ||
343 | ||
9fdf9d29 OZ |
344 | struct rtattr * |
345 | nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen) | |
95616c82 | 346 | { |
9fdf9d29 OZ |
347 | uint pos = NLMSG_ALIGN(h->nlmsg_len); |
348 | uint len = RTA_LENGTH(dlen); | |
95616c82 OZ |
349 | |
350 | if (pos + len > bufsize) | |
351 | bug("nl_add_attr: packet buffer overflow"); | |
9fdf9d29 OZ |
352 | |
353 | struct rtattr *a = (struct rtattr *)((char *)h + pos); | |
95616c82 OZ |
354 | a->rta_type = code; |
355 | a->rta_len = len; | |
356 | h->nlmsg_len = pos + len; | |
9fdf9d29 OZ |
357 | |
358 | if (dlen > 0) | |
359 | memcpy(RTA_DATA(a), data, dlen); | |
360 | ||
361 | return a; | |
95616c82 OZ |
362 | } |
363 | ||
364 | static inline void | |
365 | nl_add_attr_u32(struct nlmsghdr *h, unsigned bufsize, int code, u32 data) | |
366 | { | |
367 | nl_add_attr(h, bufsize, code, &data, 4); | |
368 | } | |
369 | ||
370 | static inline void | |
371 | nl_add_attr_ipa(struct nlmsghdr *h, unsigned bufsize, int code, ip_addr ipa) | |
372 | { | |
373 | ipa_hton(ipa); | |
374 | nl_add_attr(h, bufsize, code, &ipa, sizeof(ipa)); | |
375 | } | |
376 | ||
9fdf9d29 OZ |
377 | static inline struct rtattr * |
378 | nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code) | |
379 | { | |
380 | return nl_add_attr(h, bufsize, code, NULL, 0); | |
381 | } | |
95616c82 OZ |
382 | |
383 | static inline void | |
9fdf9d29 | 384 | nl_close_attr(struct nlmsghdr *h, struct rtattr *a) |
95616c82 | 385 | { |
9fdf9d29 | 386 | a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a; |
95616c82 OZ |
387 | } |
388 | ||
9fdf9d29 OZ |
389 | static inline struct rtnexthop * |
390 | nl_open_nexthop(struct nlmsghdr *h, uint bufsize) | |
391 | { | |
392 | uint pos = NLMSG_ALIGN(h->nlmsg_len); | |
393 | uint len = RTNH_LENGTH(0); | |
394 | ||
395 | if (pos + len > bufsize) | |
396 | bug("nl_open_nexthop: packet buffer overflow"); | |
397 | ||
398 | h->nlmsg_len = pos + len; | |
399 | ||
400 | return (void *)h + pos; | |
401 | } | |
402 | ||
403 | static inline void | |
404 | nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh) | |
405 | { | |
406 | nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh; | |
407 | } | |
95616c82 OZ |
408 | |
409 | static void | |
410 | nl_add_multipath(struct nlmsghdr *h, unsigned bufsize, struct mpnh *nh) | |
411 | { | |
9fdf9d29 OZ |
412 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH); |
413 | ||
95616c82 | 414 | for (; nh; nh = nh->next) |
9fdf9d29 OZ |
415 | { |
416 | struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize); | |
95616c82 | 417 | |
9fdf9d29 OZ |
418 | rtnh->rtnh_flags = 0; |
419 | rtnh->rtnh_hops = nh->weight; | |
420 | rtnh->rtnh_ifindex = nh->iface->index; | |
95616c82 | 421 | |
38e835de | 422 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); |
95616c82 | 423 | |
9fdf9d29 OZ |
424 | nl_close_nexthop(h, rtnh); |
425 | } | |
426 | ||
427 | nl_close_attr(h, a); | |
428 | } | |
95616c82 OZ |
429 | |
430 | static struct mpnh * | |
431 | nl_parse_multipath(struct krt_proto *p, struct rtattr *ra) | |
432 | { | |
433 | /* Temporary buffer for multicast nexthops */ | |
434 | static struct mpnh *nh_buffer; | |
435 | static int nh_buf_size; /* in number of structures */ | |
436 | static int nh_buf_used; | |
437 | ||
ad276157 | 438 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
439 | struct rtnexthop *nh = RTA_DATA(ra); |
440 | struct mpnh *rv, *first, **last; | |
441 | int len = RTA_PAYLOAD(ra); | |
442 | ||
443 | first = NULL; | |
444 | last = &first; | |
445 | nh_buf_used = 0; | |
446 | ||
447 | while (len) | |
448 | { | |
449 | /* Use RTNH_OK(nh,len) ?? */ | |
450 | if ((len < sizeof(*nh)) || (len < nh->rtnh_len)) | |
451 | return NULL; | |
452 | ||
453 | if (nh_buf_used == nh_buf_size) | |
454 | { | |
455 | nh_buf_size = nh_buf_size ? (nh_buf_size * 2) : 4; | |
456 | nh_buffer = xrealloc(nh_buffer, nh_buf_size * sizeof(struct mpnh)); | |
457 | } | |
458 | *last = rv = nh_buffer + nh_buf_used++; | |
459 | rv->next = NULL; | |
460 | last = &(rv->next); | |
461 | ||
462 | rv->weight = nh->rtnh_hops; | |
463 | rv->iface = if_find_by_index(nh->rtnh_ifindex); | |
464 | if (!rv->iface) | |
465 | return NULL; | |
466 | ||
467 | /* Nonexistent RTNH_PAYLOAD ?? */ | |
468 | nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0); | |
ad276157 | 469 | nl_parse_attrs(RTNH_DATA(nh), mpnh_attr_want4, a, sizeof(a)); |
95616c82 OZ |
470 | if (a[RTA_GATEWAY]) |
471 | { | |
95616c82 OZ |
472 | memcpy(&rv->gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ip_addr)); |
473 | ipa_ntoh(rv->gw); | |
474 | ||
475 | neighbor *ng = neigh_find2(&p->p, &rv->gw, rv->iface, | |
476 | (nh->rtnh_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0); | |
477 | if (!ng || (ng->scope == SCOPE_HOST)) | |
478 | return NULL; | |
479 | } | |
480 | else | |
481 | return NULL; | |
482 | ||
483 | len -= NLMSG_ALIGN(nh->rtnh_len); | |
484 | nh = RTNH_NEXT(nh); | |
485 | } | |
486 | ||
487 | return first; | |
488 | } | |
489 | ||
9fdf9d29 OZ |
490 | static void |
491 | nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max) | |
492 | { | |
493 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS); | |
494 | int t; | |
495 | ||
496 | for (t = 1; t < max; t++) | |
497 | if (metrics[0] & (1 << t)) | |
498 | nl_add_attr_u32(h, bufsize, t, metrics[t]); | |
499 | ||
500 | nl_close_attr(h, a); | |
501 | } | |
502 | ||
503 | static int | |
504 | nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max) | |
505 | { | |
506 | struct rtattr *a = RTA_DATA(hdr); | |
507 | int len = RTA_PAYLOAD(hdr); | |
508 | ||
509 | metrics[0] = 0; | |
510 | for (; RTA_OK(a, len); a = RTA_NEXT(a, len)) | |
511 | { | |
512 | if (a->rta_type == RTA_UNSPEC) | |
513 | continue; | |
514 | ||
515 | if (a->rta_type >= max) | |
516 | continue; | |
517 | ||
518 | if (RTA_PAYLOAD(a) != 4) | |
519 | return -1; | |
520 | ||
521 | metrics[0] |= 1 << a->rta_type; | |
acb04cfd | 522 | metrics[a->rta_type] = rta_get_u32(a); |
9fdf9d29 OZ |
523 | } |
524 | ||
525 | if (len > 0) | |
526 | return -1; | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
95616c82 OZ |
531 | |
532 | /* | |
533 | * Scanning of interfaces | |
534 | */ | |
535 | ||
536 | static void | |
537 | nl_parse_link(struct nlmsghdr *h, int scan) | |
538 | { | |
539 | struct ifinfomsg *i; | |
ad276157 | 540 | struct rtattr *a[BIRD_IFLA_MAX]; |
95616c82 OZ |
541 | int new = h->nlmsg_type == RTM_NEWLINK; |
542 | struct iface f = {}; | |
543 | struct iface *ifi; | |
544 | char *name; | |
545 | u32 mtu; | |
ae80a2de | 546 | uint fl; |
95616c82 | 547 | |
ad276157 | 548 | if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a))) |
95616c82 | 549 | return; |
ad276157 | 550 | if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU]) |
95616c82 | 551 | { |
ad276157 JMM |
552 | /* |
553 | * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come | |
554 | * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists. | |
555 | * We simply ignore all such messages with IFLA_WIRELESS without notice. | |
556 | */ | |
557 | ||
558 | if (a[IFLA_WIRELESS]) | |
559 | return; | |
560 | ||
561 | log(L_ERR "KIF: Malformed message received"); | |
95616c82 OZ |
562 | return; |
563 | } | |
ad276157 | 564 | |
95616c82 | 565 | name = RTA_DATA(a[IFLA_IFNAME]); |
acb04cfd | 566 | mtu = rta_get_u32(a[IFLA_MTU]); |
95616c82 OZ |
567 | |
568 | ifi = if_find_by_index(i->ifi_index); | |
569 | if (!new) | |
570 | { | |
571 | DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name); | |
572 | if (!ifi) | |
573 | return; | |
574 | ||
575 | if_delete(ifi); | |
576 | } | |
577 | else | |
578 | { | |
579 | DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags); | |
580 | if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1)) | |
581 | if_delete(ifi); | |
582 | ||
583 | strncpy(f.name, name, sizeof(f.name)-1); | |
584 | f.index = i->ifi_index; | |
585 | f.mtu = mtu; | |
586 | ||
587 | fl = i->ifi_flags; | |
588 | if (fl & IFF_UP) | |
589 | f.flags |= IF_ADMIN_UP; | |
590 | if (fl & IFF_LOWER_UP) | |
591 | f.flags |= IF_LINK_UP; | |
592 | if (fl & IFF_LOOPBACK) /* Loopback */ | |
593 | f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE; | |
594 | else if (fl & IFF_POINTOPOINT) /* PtP */ | |
595 | f.flags |= IF_MULTICAST; | |
596 | else if (fl & IFF_BROADCAST) /* Broadcast */ | |
597 | f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST; | |
598 | else | |
599 | f.flags |= IF_MULTIACCESS; /* NBMA */ | |
3216eb03 | 600 | |
16a3254c OZ |
601 | if (fl & IFF_MULTICAST) |
602 | f.flags |= IF_MULTICAST; | |
603 | ||
3216eb03 OZ |
604 | ifi = if_update(&f); |
605 | ||
606 | if (!scan) | |
607 | if_end_partial_update(ifi); | |
95616c82 OZ |
608 | } |
609 | } | |
610 | ||
611 | static void | |
3216eb03 | 612 | nl_parse_addr(struct nlmsghdr *h, int scan) |
95616c82 OZ |
613 | { |
614 | struct ifaddrmsg *i; | |
ad276157 | 615 | struct rtattr *a[BIRD_IFA_MAX]; |
95616c82 OZ |
616 | int new = h->nlmsg_type == RTM_NEWADDR; |
617 | struct ifa ifa; | |
618 | struct iface *ifi; | |
619 | int scope; | |
e37d2e3e | 620 | u32 ifa_flags; |
95616c82 | 621 | |
ad276157 | 622 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 623 | return; |
ad276157 JMM |
624 | |
625 | switch (i->ifa_family) | |
626 | { | |
627 | #ifndef IPV6 | |
628 | case AF_INET: | |
629 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a))) | |
630 | return; | |
631 | if (!a[IFA_LOCAL]) | |
632 | { | |
633 | log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)"); | |
634 | return; | |
635 | } | |
636 | break; | |
95616c82 | 637 | #else |
ad276157 JMM |
638 | case AF_INET6: |
639 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a))) | |
640 | return; | |
641 | break; | |
95616c82 | 642 | #endif |
ad276157 JMM |
643 | default: |
644 | return; | |
645 | } | |
646 | ||
647 | if (!a[IFA_ADDRESS]) | |
95616c82 | 648 | { |
ad276157 | 649 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); |
95616c82 OZ |
650 | return; |
651 | } | |
652 | ||
e37d2e3e OZ |
653 | if (a[IFA_FLAGS]) |
654 | ifa_flags = rta_get_u32(a[IFA_FLAGS]); | |
655 | else | |
656 | ifa_flags = i->ifa_flags; | |
657 | ||
95616c82 OZ |
658 | ifi = if_find_by_index(i->ifa_index); |
659 | if (!ifi) | |
660 | { | |
661 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
662 | return; | |
663 | } | |
664 | ||
665 | bzero(&ifa, sizeof(ifa)); | |
666 | ifa.iface = ifi; | |
e37d2e3e | 667 | if (ifa_flags & IFA_F_SECONDARY) |
95616c82 OZ |
668 | ifa.flags |= IA_SECONDARY; |
669 | ||
e37d2e3e OZ |
670 | #ifdef IPV6 |
671 | /* Ignore tentative addresses silently */ | |
672 | if (ifa_flags & IFA_F_TENTATIVE) | |
673 | return; | |
674 | #endif | |
675 | ||
95616c82 OZ |
676 | /* IFA_LOCAL can be unset for IPv6 interfaces */ |
677 | memcpy(&ifa.ip, RTA_DATA(a[IFA_LOCAL] ? : a[IFA_ADDRESS]), sizeof(ifa.ip)); | |
678 | ipa_ntoh(ifa.ip); | |
679 | ifa.pxlen = i->ifa_prefixlen; | |
680 | if (i->ifa_prefixlen > BITS_PER_IP_ADDRESS) | |
681 | { | |
682 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
683 | new = 0; | |
684 | } | |
685 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS) | |
686 | { | |
687 | ip_addr addr; | |
688 | memcpy(&addr, RTA_DATA(a[IFA_ADDRESS]), sizeof(addr)); | |
689 | ipa_ntoh(addr); | |
690 | ifa.prefix = ifa.brd = addr; | |
691 | ||
692 | /* It is either a host address or a peer address */ | |
693 | if (ipa_equal(ifa.ip, addr)) | |
694 | ifa.flags |= IA_HOST; | |
695 | else | |
696 | { | |
697 | ifa.flags |= IA_PEER; | |
698 | ifa.opposite = addr; | |
699 | } | |
700 | } | |
701 | else | |
702 | { | |
703 | ip_addr netmask = ipa_mkmask(ifa.pxlen); | |
704 | ifa.prefix = ipa_and(ifa.ip, netmask); | |
705 | ifa.brd = ipa_or(ifa.ip, ipa_not(netmask)); | |
706 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 1) | |
707 | ifa.opposite = ipa_opposite_m1(ifa.ip); | |
708 | ||
709 | #ifndef IPV6 | |
710 | if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 2) | |
711 | ifa.opposite = ipa_opposite_m2(ifa.ip); | |
712 | ||
713 | if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST]) | |
714 | { | |
715 | ip_addr xbrd; | |
716 | memcpy(&xbrd, RTA_DATA(a[IFA_BROADCAST]), sizeof(xbrd)); | |
717 | ipa_ntoh(xbrd); | |
718 | if (ipa_equal(xbrd, ifa.prefix) || ipa_equal(xbrd, ifa.brd)) | |
719 | ifa.brd = xbrd; | |
720 | else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */ | |
721 | log(L_ERR "KIF: Invalid broadcast address %I for %s", xbrd, ifi->name); | |
722 | } | |
723 | #endif | |
724 | } | |
725 | ||
726 | scope = ipa_classify(ifa.ip); | |
727 | if (scope < 0) | |
728 | { | |
729 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
730 | return; | |
731 | } | |
732 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
733 | ||
734 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %I/%d, brd %I, opp %I\n", | |
735 | ifi->index, ifi->name, | |
736 | new ? "added" : "removed", | |
737 | ifa.ip, ifa.flags, ifa.prefix, ifa.pxlen, ifa.brd, ifa.opposite); | |
3216eb03 | 738 | |
95616c82 OZ |
739 | if (new) |
740 | ifa_update(&ifa); | |
741 | else | |
742 | ifa_delete(&ifa); | |
3216eb03 OZ |
743 | |
744 | if (!scan) | |
745 | if_end_partial_update(ifi); | |
95616c82 OZ |
746 | } |
747 | ||
748 | void | |
749 | kif_do_scan(struct kif_proto *p UNUSED) | |
750 | { | |
751 | struct nlmsghdr *h; | |
752 | ||
753 | if_start_update(); | |
754 | ||
86c3eea0 | 755 | nl_request_dump(AF_UNSPEC, RTM_GETLINK); |
95616c82 OZ |
756 | while (h = nl_get_scan()) |
757 | if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK) | |
758 | nl_parse_link(h, 1); | |
759 | else | |
760 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
761 | ||
86c3eea0 | 762 | nl_request_dump(BIRD_AF, RTM_GETADDR); |
95616c82 OZ |
763 | while (h = nl_get_scan()) |
764 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
3216eb03 | 765 | nl_parse_addr(h, 1); |
95616c82 OZ |
766 | else |
767 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
768 | ||
769 | if_end_update(); | |
770 | } | |
771 | ||
772 | /* | |
773 | * Routes | |
774 | */ | |
775 | ||
9ddbfbdd JMM |
776 | static inline u32 |
777 | krt_table_id(struct krt_proto *p) | |
778 | { | |
779 | return KRT_CF->sys.table_id; | |
780 | } | |
781 | ||
782 | static HASH(struct krt_proto) nl_table_map; | |
783 | ||
784 | #define RTH_FN(k) u32_hash(k) | |
785 | #define RTH_EQ(k1,k2) k1 == k2 | |
786 | #define RTH_KEY(p) krt_table_id(p) | |
787 | #define RTH_NEXT(p) p->sys.hash_next | |
788 | ||
789 | #define RTH_REHASH rth_rehash | |
790 | #define RTH_PARAMS /8, *2, 2, 2, 6, 20 | |
791 | ||
792 | HASH_DEFINE_REHASH_FN(RTH, struct krt_proto) | |
95616c82 OZ |
793 | |
794 | int | |
795 | krt_capable(rte *e) | |
796 | { | |
797 | rta *a = e->attrs; | |
798 | ||
799 | if (a->cast != RTC_UNICAST) | |
800 | return 0; | |
801 | ||
802 | switch (a->dest) | |
803 | { | |
804 | case RTD_ROUTER: | |
805 | case RTD_DEVICE: | |
806 | if (a->iface == NULL) | |
807 | return 0; | |
808 | case RTD_BLACKHOLE: | |
809 | case RTD_UNREACHABLE: | |
810 | case RTD_PROHIBIT: | |
811 | case RTD_MULTIPATH: | |
812 | break; | |
813 | default: | |
814 | return 0; | |
815 | } | |
816 | return 1; | |
817 | } | |
818 | ||
819 | static inline int | |
820 | nh_bufsize(struct mpnh *nh) | |
821 | { | |
822 | int rv = 0; | |
823 | for (; nh != NULL; nh = nh->next) | |
9fdf9d29 | 824 | rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr))); |
95616c82 OZ |
825 | return rv; |
826 | } | |
827 | ||
828 | static int | |
829 | nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new) | |
830 | { | |
831 | eattr *ea; | |
832 | net *net = e->net; | |
833 | rta *a = e->attrs; | |
834 | struct { | |
835 | struct nlmsghdr h; | |
836 | struct rtmsg r; | |
9fdf9d29 | 837 | char buf[128 + KRT_METRICS_MAX*8 + nh_bufsize(a->nexthops)]; |
95616c82 OZ |
838 | } r; |
839 | ||
840 | DBG("nl_send_route(%I/%d,new=%d)\n", net->n.prefix, net->n.pxlen, new); | |
841 | ||
842 | bzero(&r.h, sizeof(r.h)); | |
843 | bzero(&r.r, sizeof(r.r)); | |
844 | r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE; | |
845 | r.h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); | |
846 | r.h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_EXCL : 0); | |
847 | ||
848 | r.r.rtm_family = BIRD_AF; | |
849 | r.r.rtm_dst_len = net->n.pxlen; | |
95616c82 OZ |
850 | r.r.rtm_protocol = RTPROT_BIRD; |
851 | r.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
852 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix); | |
853 | ||
9ddbfbdd JMM |
854 | if (krt_table_id(p) < 256) |
855 | r.r.rtm_table = krt_table_id(p); | |
856 | else | |
857 | nl_add_attr_u32(&r.h, sizeof(r), RTA_TABLE, krt_table_id(p)); | |
858 | ||
78a2cc28 OZ |
859 | /* For route delete, we do not specify route attributes */ |
860 | if (!new) | |
861 | return nl_exchange(&r.h); | |
862 | ||
863 | ||
95616c82 | 864 | if (ea = ea_find(eattrs, EA_KRT_METRIC)) |
9fdf9d29 | 865 | nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, ea->u.data); |
95616c82 OZ |
866 | |
867 | if (ea = ea_find(eattrs, EA_KRT_PREFSRC)) | |
868 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); | |
869 | ||
870 | if (ea = ea_find(eattrs, EA_KRT_REALM)) | |
871 | nl_add_attr_u32(&r.h, sizeof(r), RTA_FLOW, ea->u.data); | |
872 | ||
9fdf9d29 OZ |
873 | |
874 | u32 metrics[KRT_METRICS_MAX]; | |
875 | metrics[0] = 0; | |
876 | ||
877 | struct ea_walk_state ews = { .eattrs = eattrs }; | |
878 | while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX)) | |
879 | { | |
880 | int id = ea->id - EA_KRT_METRICS; | |
881 | metrics[0] |= 1 << id; | |
882 | metrics[id] = ea->u.data; | |
883 | } | |
884 | ||
885 | if (metrics[0]) | |
886 | nl_add_metrics(&r.h, sizeof(r), metrics, KRT_METRICS_MAX); | |
887 | ||
888 | ||
95616c82 OZ |
889 | /* a->iface != NULL checked in krt_capable() for router and device routes */ |
890 | ||
891 | switch (a->dest) | |
892 | { | |
893 | case RTD_ROUTER: | |
894 | r.r.rtm_type = RTN_UNICAST; | |
895 | nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); | |
896 | nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw); | |
897 | break; | |
898 | case RTD_DEVICE: | |
899 | r.r.rtm_type = RTN_UNICAST; | |
900 | nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); | |
901 | break; | |
902 | case RTD_BLACKHOLE: | |
903 | r.r.rtm_type = RTN_BLACKHOLE; | |
904 | break; | |
905 | case RTD_UNREACHABLE: | |
906 | r.r.rtm_type = RTN_UNREACHABLE; | |
907 | break; | |
908 | case RTD_PROHIBIT: | |
909 | r.r.rtm_type = RTN_PROHIBIT; | |
910 | break; | |
911 | case RTD_MULTIPATH: | |
912 | r.r.rtm_type = RTN_UNICAST; | |
913 | nl_add_multipath(&r.h, sizeof(r), a->nexthops); | |
914 | break; | |
915 | default: | |
916 | bug("krt_capable inconsistent with nl_send_route"); | |
917 | } | |
918 | ||
919 | return nl_exchange(&r.h); | |
920 | } | |
921 | ||
922 | void | |
923 | krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old, struct ea_list *eattrs) | |
924 | { | |
925 | int err = 0; | |
926 | ||
927 | /* | |
928 | * NULL for eattr of the old route is a little hack, but we don't | |
929 | * get proper eattrs for old in rt_notify() anyway. NULL means no | |
930 | * extended route attributes and therefore matches if the kernel | |
931 | * route has any of them. | |
932 | */ | |
933 | ||
934 | if (old) | |
935 | nl_send_route(p, old, NULL, 0); | |
936 | ||
937 | if (new) | |
938 | err = nl_send_route(p, new, eattrs, 1); | |
939 | ||
940 | if (err < 0) | |
941 | n->n.flags |= KRF_SYNC_ERROR; | |
942 | else | |
943 | n->n.flags &= ~KRF_SYNC_ERROR; | |
944 | } | |
945 | ||
946 | ||
947 | #define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0) | |
948 | ||
949 | static void | |
950 | nl_parse_route(struct nlmsghdr *h, int scan) | |
951 | { | |
952 | struct krt_proto *p; | |
953 | struct rtmsg *i; | |
ad276157 | 954 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
955 | int new = h->nlmsg_type == RTM_NEWROUTE; |
956 | ||
957 | ip_addr dst = IPA_NONE; | |
958 | u32 oif = ~0; | |
9ddbfbdd | 959 | u32 table; |
95616c82 OZ |
960 | int src; |
961 | ||
ad276157 | 962 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 963 | return; |
ad276157 JMM |
964 | |
965 | switch (i->rtm_family) | |
95616c82 | 966 | { |
ad276157 JMM |
967 | #ifndef IPV6 |
968 | case AF_INET: | |
969 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a))) | |
970 | return; | |
971 | break; | |
972 | #else | |
973 | case AF_INET6: | |
974 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a))) | |
975 | return; | |
976 | break; | |
977 | #endif | |
978 | default: | |
979 | return; | |
95616c82 OZ |
980 | } |
981 | ||
ad276157 | 982 | |
95616c82 OZ |
983 | if (a[RTA_DST]) |
984 | { | |
985 | memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst)); | |
986 | ipa_ntoh(dst); | |
987 | } | |
988 | ||
989 | if (a[RTA_OIF]) | |
acb04cfd | 990 | oif = rta_get_u32(a[RTA_OIF]); |
95616c82 | 991 | |
9ddbfbdd JMM |
992 | if (a[RTA_TABLE]) |
993 | table = rta_get_u32(a[RTA_TABLE]); | |
994 | else | |
995 | table = i->rtm_table; | |
996 | ||
997 | p = HASH_FIND(nl_table_map, RTH, table); /* Do we know this table? */ | |
998 | 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 | 999 | if (!p) |
9ddbfbdd | 1000 | SKIP("unknown table %d\n", table); |
95616c82 OZ |
1001 | |
1002 | ||
1003 | #ifdef IPV6 | |
1004 | if (a[RTA_IIF]) | |
1005 | SKIP("IIF set\n"); | |
1006 | #else | |
1007 | if (i->rtm_tos != 0) /* We don't support TOS */ | |
1008 | SKIP("TOS %02x\n", i->rtm_tos); | |
1009 | #endif | |
1010 | ||
1011 | if (scan && !new) | |
1012 | SKIP("RTM_DELROUTE in scan\n"); | |
1013 | ||
1014 | int c = ipa_classify_net(dst); | |
1015 | if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) | |
1016 | SKIP("strange class/scope\n"); | |
1017 | ||
1018 | // ignore rtm_scope, it is not a real scope | |
1019 | // if (i->rtm_scope != RT_SCOPE_UNIVERSE) | |
1020 | // SKIP("scope %u\n", i->rtm_scope); | |
1021 | ||
1022 | switch (i->rtm_protocol) | |
1023 | { | |
1024 | case RTPROT_UNSPEC: | |
1025 | SKIP("proto unspec\n"); | |
1026 | ||
1027 | case RTPROT_REDIRECT: | |
1028 | src = KRT_SRC_REDIRECT; | |
1029 | break; | |
1030 | ||
1031 | case RTPROT_KERNEL: | |
1032 | src = KRT_SRC_KERNEL; | |
1033 | return; | |
1034 | ||
1035 | case RTPROT_BIRD: | |
1036 | if (!scan) | |
1037 | SKIP("echo\n"); | |
1038 | src = KRT_SRC_BIRD; | |
1039 | break; | |
1040 | ||
1041 | case RTPROT_BOOT: | |
1042 | default: | |
1043 | src = KRT_SRC_ALIEN; | |
1044 | } | |
1045 | ||
1046 | net *net = net_get(p->p.table, dst, i->rtm_dst_len); | |
1047 | ||
1048 | rta ra = { | |
094d2bdb | 1049 | .src= p->p.main_source, |
95616c82 OZ |
1050 | .source = RTS_INHERIT, |
1051 | .scope = SCOPE_UNIVERSE, | |
1052 | .cast = RTC_UNICAST | |
1053 | }; | |
1054 | ||
1055 | switch (i->rtm_type) | |
1056 | { | |
1057 | case RTN_UNICAST: | |
1058 | ||
ad276157 | 1059 | if (a[RTA_MULTIPATH] && (i->rtm_family == AF_INET)) |
95616c82 OZ |
1060 | { |
1061 | ra.dest = RTD_MULTIPATH; | |
1062 | ra.nexthops = nl_parse_multipath(p, a[RTA_MULTIPATH]); | |
1063 | if (!ra.nexthops) | |
1064 | { | |
1065 | log(L_ERR "KRT: Received strange multipath route %I/%d", | |
1066 | net->n.prefix, net->n.pxlen); | |
1067 | return; | |
1068 | } | |
9fdf9d29 | 1069 | |
95616c82 OZ |
1070 | break; |
1071 | } | |
1072 | ||
1073 | ra.iface = if_find_by_index(oif); | |
1074 | if (!ra.iface) | |
1075 | { | |
1076 | log(L_ERR "KRT: Received route %I/%d with unknown ifindex %u", | |
1077 | net->n.prefix, net->n.pxlen, oif); | |
1078 | return; | |
1079 | } | |
1080 | ||
1081 | if (a[RTA_GATEWAY]) | |
1082 | { | |
1083 | neighbor *ng; | |
1084 | ra.dest = RTD_ROUTER; | |
1085 | memcpy(&ra.gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ra.gw)); | |
1086 | ipa_ntoh(ra.gw); | |
1087 | ||
9810d055 | 1088 | #ifdef IPV6 |
95616c82 OZ |
1089 | /* Silently skip strange 6to4 routes */ |
1090 | if (ipa_in_net(ra.gw, IPA_NONE, 96)) | |
1091 | return; | |
9810d055 | 1092 | #endif |
95616c82 OZ |
1093 | |
1094 | ng = neigh_find2(&p->p, &ra.gw, ra.iface, | |
1095 | (i->rtm_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0); | |
1096 | if (!ng || (ng->scope == SCOPE_HOST)) | |
1097 | { | |
1098 | log(L_ERR "KRT: Received route %I/%d with strange next-hop %I", | |
1099 | net->n.prefix, net->n.pxlen, ra.gw); | |
1100 | return; | |
1101 | } | |
1102 | } | |
1103 | else | |
1104 | { | |
1105 | ra.dest = RTD_DEVICE; | |
95616c82 OZ |
1106 | } |
1107 | ||
1108 | break; | |
1109 | case RTN_BLACKHOLE: | |
1110 | ra.dest = RTD_BLACKHOLE; | |
1111 | break; | |
1112 | case RTN_UNREACHABLE: | |
1113 | ra.dest = RTD_UNREACHABLE; | |
1114 | break; | |
1115 | case RTN_PROHIBIT: | |
1116 | ra.dest = RTD_PROHIBIT; | |
1117 | break; | |
1118 | /* FIXME: What about RTN_THROW? */ | |
1119 | default: | |
1120 | SKIP("type %d\n", i->rtm_type); | |
1121 | return; | |
1122 | } | |
1123 | ||
1124 | rte *e = rte_get_temp(&ra); | |
1125 | e->net = net; | |
1126 | e->u.krt.src = src; | |
1127 | e->u.krt.proto = i->rtm_protocol; | |
e86cfd41 OZ |
1128 | e->u.krt.seen = 0; |
1129 | e->u.krt.best = 0; | |
acb04cfd | 1130 | e->u.krt.metric = 0; |
95616c82 OZ |
1131 | |
1132 | if (a[RTA_PRIORITY]) | |
acb04cfd | 1133 | e->u.krt.metric = rta_get_u32(a[RTA_PRIORITY]); |
95616c82 OZ |
1134 | |
1135 | if (a[RTA_PREFSRC]) | |
1136 | { | |
1137 | ip_addr ps; | |
1138 | memcpy(&ps, RTA_DATA(a[RTA_PREFSRC]), sizeof(ps)); | |
1139 | ipa_ntoh(ps); | |
1140 | ||
1141 | ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr)); | |
1142 | ea->next = ra.eattrs; | |
1143 | ra.eattrs = ea; | |
1144 | ea->flags = EALF_SORTED; | |
1145 | ea->count = 1; | |
1146 | ea->attrs[0].id = EA_KRT_PREFSRC; | |
1147 | ea->attrs[0].flags = 0; | |
1148 | ea->attrs[0].type = EAF_TYPE_IP_ADDRESS; | |
1149 | ea->attrs[0].u.ptr = alloca(sizeof(struct adata) + sizeof(ps)); | |
1150 | ea->attrs[0].u.ptr->length = sizeof(ps); | |
1151 | memcpy(ea->attrs[0].u.ptr->data, &ps, sizeof(ps)); | |
1152 | } | |
1153 | ||
1154 | if (a[RTA_FLOW]) | |
1155 | { | |
1156 | ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr)); | |
1157 | ea->next = ra.eattrs; | |
1158 | ra.eattrs = ea; | |
1159 | ea->flags = EALF_SORTED; | |
1160 | ea->count = 1; | |
1161 | ea->attrs[0].id = EA_KRT_REALM; | |
1162 | ea->attrs[0].flags = 0; | |
1163 | ea->attrs[0].type = EAF_TYPE_INT; | |
acb04cfd | 1164 | ea->attrs[0].u.data = rta_get_u32(a[RTA_FLOW]); |
95616c82 OZ |
1165 | } |
1166 | ||
9fdf9d29 OZ |
1167 | if (a[RTA_METRICS]) |
1168 | { | |
1169 | u32 metrics[KRT_METRICS_MAX]; | |
1170 | ea_list *ea = alloca(sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr)); | |
1171 | int t, n = 0; | |
1172 | ||
1173 | if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0) | |
1174 | { | |
1175 | log(L_ERR "KRT: Received route %I/%d with strange RTA_METRICS attribute", | |
1176 | net->n.prefix, net->n.pxlen); | |
1177 | return; | |
1178 | } | |
1179 | ||
1180 | for (t = 1; t < KRT_METRICS_MAX; t++) | |
1181 | if (metrics[0] & (1 << t)) | |
1182 | { | |
1183 | ea->attrs[n].id = EA_CODE(EAP_KRT, KRT_METRICS_OFFSET + t); | |
1184 | ea->attrs[n].flags = 0; | |
1185 | ea->attrs[n].type = EAF_TYPE_INT; /* FIXME: Some are EAF_TYPE_BITFIELD */ | |
1186 | ea->attrs[n].u.data = metrics[t]; | |
1187 | n++; | |
1188 | } | |
1189 | ||
1190 | if (n > 0) | |
1191 | { | |
1192 | ea->next = ra.eattrs; | |
1193 | ea->flags = EALF_SORTED; | |
1194 | ea->count = n; | |
1195 | ra.eattrs = ea; | |
1196 | } | |
1197 | } | |
1198 | ||
95616c82 OZ |
1199 | if (scan) |
1200 | krt_got_route(p, e); | |
1201 | else | |
1202 | krt_got_route_async(p, e, new); | |
1203 | } | |
1204 | ||
1205 | void | |
1206 | krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */ | |
1207 | { | |
1208 | struct nlmsghdr *h; | |
1209 | ||
86c3eea0 | 1210 | nl_request_dump(BIRD_AF, RTM_GETROUTE); |
95616c82 OZ |
1211 | while (h = nl_get_scan()) |
1212 | if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE) | |
1213 | nl_parse_route(h, 1); | |
1214 | else | |
1215 | log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type); | |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | * Asynchronous Netlink interface | |
1220 | */ | |
1221 | ||
1222 | static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */ | |
1223 | static byte *nl_async_rx_buffer; /* Receive buffer */ | |
1224 | ||
1225 | static void | |
1226 | nl_async_msg(struct nlmsghdr *h) | |
1227 | { | |
1228 | switch (h->nlmsg_type) | |
1229 | { | |
1230 | case RTM_NEWROUTE: | |
1231 | case RTM_DELROUTE: | |
1232 | DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type); | |
1233 | nl_parse_route(h, 0); | |
1234 | break; | |
1235 | case RTM_NEWLINK: | |
1236 | case RTM_DELLINK: | |
1237 | DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1238 | if (kif_proto) |
1239 | nl_parse_link(h, 0); | |
95616c82 OZ |
1240 | break; |
1241 | case RTM_NEWADDR: | |
1242 | case RTM_DELADDR: | |
1243 | DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1244 | if (kif_proto) |
1245 | nl_parse_addr(h, 0); | |
95616c82 OZ |
1246 | break; |
1247 | default: | |
1248 | DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type); | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | static int | |
1253 | nl_async_hook(sock *sk, int size UNUSED) | |
1254 | { | |
1255 | struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE }; | |
1256 | struct sockaddr_nl sa; | |
31e9e101 ST |
1257 | struct msghdr m = { |
1258 | .msg_name = &sa, | |
1259 | .msg_namelen = sizeof(sa), | |
1260 | .msg_iov = &iov, | |
1261 | .msg_iovlen = 1, | |
1262 | }; | |
95616c82 OZ |
1263 | struct nlmsghdr *h; |
1264 | int x; | |
ae80a2de | 1265 | uint len; |
95616c82 OZ |
1266 | |
1267 | x = recvmsg(sk->fd, &m, 0); | |
1268 | if (x < 0) | |
1269 | { | |
1270 | if (errno == ENOBUFS) | |
1271 | { | |
1272 | /* | |
1273 | * Netlink reports some packets have been thrown away. | |
1274 | * One day we might react to it by asking for route table | |
1275 | * scan in near future. | |
1276 | */ | |
1277 | return 1; /* More data are likely to be ready */ | |
1278 | } | |
1279 | else if (errno != EWOULDBLOCK) | |
1280 | log(L_ERR "Netlink recvmsg: %m"); | |
1281 | return 0; | |
1282 | } | |
1283 | if (sa.nl_pid) /* It isn't from the kernel */ | |
1284 | { | |
1285 | DBG("Non-kernel packet\n"); | |
1286 | return 1; | |
1287 | } | |
1288 | h = (void *) nl_async_rx_buffer; | |
1289 | len = x; | |
1290 | if (m.msg_flags & MSG_TRUNC) | |
1291 | { | |
1292 | log(L_WARN "Netlink got truncated asynchronous message"); | |
1293 | return 1; | |
1294 | } | |
1295 | while (NLMSG_OK(h, len)) | |
1296 | { | |
1297 | nl_async_msg(h); | |
1298 | h = NLMSG_NEXT(h, len); | |
1299 | } | |
1300 | if (len) | |
1301 | log(L_WARN "nl_async_hook: Found packet remnant of size %d", len); | |
1302 | return 1; | |
1303 | } | |
1304 | ||
1305 | static void | |
1306 | nl_open_async(void) | |
1307 | { | |
1308 | sock *sk; | |
1309 | struct sockaddr_nl sa; | |
1310 | int fd; | |
95616c82 | 1311 | |
f83ce94d | 1312 | if (nl_async_sk) |
95616c82 | 1313 | return; |
95616c82 OZ |
1314 | |
1315 | DBG("KRT: Opening async netlink socket\n"); | |
1316 | ||
1317 | fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
1318 | if (fd < 0) | |
1319 | { | |
1320 | log(L_ERR "Unable to open asynchronous rtnetlink socket: %m"); | |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | bzero(&sa, sizeof(sa)); | |
1325 | sa.nl_family = AF_NETLINK; | |
1326 | #ifdef IPV6 | |
1327 | sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE; | |
1328 | #else | |
1329 | sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE; | |
1330 | #endif | |
1331 | if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) | |
1332 | { | |
1333 | log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m"); | |
f83ce94d | 1334 | close(fd); |
95616c82 OZ |
1335 | return; |
1336 | } | |
1337 | ||
f83ce94d OZ |
1338 | nl_async_rx_buffer = xmalloc(NL_RX_SIZE); |
1339 | ||
95616c82 OZ |
1340 | sk = nl_async_sk = sk_new(krt_pool); |
1341 | sk->type = SK_MAGIC; | |
1342 | sk->rx_hook = nl_async_hook; | |
1343 | sk->fd = fd; | |
05476c4d | 1344 | if (sk_open(sk) < 0) |
95616c82 | 1345 | bug("Netlink: sk_open failed"); |
95616c82 OZ |
1346 | } |
1347 | ||
9ddbfbdd | 1348 | |
95616c82 OZ |
1349 | /* |
1350 | * Interface to the UNIX krt module | |
1351 | */ | |
1352 | ||
95616c82 | 1353 | void |
9ddbfbdd JMM |
1354 | krt_sys_io_init(void) |
1355 | { | |
1356 | HASH_INIT(nl_table_map, krt_pool, 6); | |
1357 | } | |
1358 | ||
1359 | int | |
c6964c30 | 1360 | krt_sys_start(struct krt_proto *p) |
95616c82 | 1361 | { |
9ddbfbdd JMM |
1362 | struct krt_proto *old = HASH_FIND(nl_table_map, RTH, krt_table_id(p)); |
1363 | ||
1364 | if (old) | |
1365 | { | |
1366 | log(L_ERR "%s: Kernel table %u already registered by %s", | |
1367 | p->p.name, krt_table_id(p), old->p.name); | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | HASH_INSERT2(nl_table_map, RTH, krt_pool, p); | |
c6964c30 OZ |
1372 | |
1373 | nl_open(); | |
1374 | nl_open_async(); | |
9ddbfbdd JMM |
1375 | |
1376 | return 1; | |
95616c82 OZ |
1377 | } |
1378 | ||
1379 | void | |
9ddbfbdd | 1380 | krt_sys_shutdown(struct krt_proto *p) |
95616c82 | 1381 | { |
9ddbfbdd | 1382 | HASH_REMOVE2(nl_table_map, RTH, krt_pool, p); |
95616c82 OZ |
1383 | } |
1384 | ||
1385 | int | |
1386 | krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o) | |
1387 | { | |
1388 | return n->sys.table_id == o->sys.table_id; | |
1389 | } | |
1390 | ||
95616c82 OZ |
1391 | void |
1392 | krt_sys_init_config(struct krt_config *cf) | |
1393 | { | |
1394 | cf->sys.table_id = RT_TABLE_MAIN; | |
1395 | } | |
1396 | ||
1397 | void | |
1398 | krt_sys_copy_config(struct krt_config *d, struct krt_config *s) | |
1399 | { | |
1400 | d->sys.table_id = s->sys.table_id; | |
1401 | } | |
1402 | ||
9fdf9d29 OZ |
1403 | static const char *krt_metrics_names[KRT_METRICS_MAX] = { |
1404 | NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss", | |
1405 | "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack" | |
1406 | }; | |
1407 | ||
1408 | static const char *krt_features_names[KRT_FEATURES_MAX] = { | |
1409 | "ecn", NULL, NULL, "allfrag" | |
1410 | }; | |
1411 | ||
1412 | int | |
1413 | krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED) | |
1414 | { | |
1415 | switch (a->id) | |
1416 | { | |
1417 | case EA_KRT_PREFSRC: | |
1418 | bsprintf(buf, "prefsrc"); | |
1419 | return GA_NAME; | |
1420 | ||
1421 | case EA_KRT_REALM: | |
1422 | bsprintf(buf, "realm"); | |
1423 | return GA_NAME; | |
1424 | ||
1425 | case EA_KRT_LOCK: | |
1426 | buf += bsprintf(buf, "lock:"); | |
1427 | ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX); | |
1428 | return GA_FULL; | |
1429 | ||
1430 | case EA_KRT_FEATURES: | |
1431 | buf += bsprintf(buf, "features:"); | |
1432 | ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX); | |
1433 | return GA_FULL; | |
1434 | ||
1435 | default:; | |
1436 | int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET; | |
1437 | if (id > 0 && id < KRT_METRICS_MAX) | |
1438 | { | |
1439 | bsprintf(buf, "%s", krt_metrics_names[id]); | |
1440 | return GA_NAME; | |
1441 | } | |
1442 | ||
1443 | return GA_UNKNOWN; | |
1444 | } | |
1445 | } | |
1446 | ||
95616c82 OZ |
1447 | |
1448 | ||
1449 | void | |
1450 | kif_sys_start(struct kif_proto *p UNUSED) | |
1451 | { | |
1452 | nl_open(); | |
1453 | nl_open_async(); | |
1454 | } | |
1455 | ||
1456 | void | |
1457 | kif_sys_shutdown(struct kif_proto *p UNUSED) | |
1458 | { | |
1459 | } |