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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" | |
4e276a89 | 22 | #include "lib/alloca.h" |
7152e5ef JMM |
23 | #include "sysdep/unix/unix.h" |
24 | #include "sysdep/unix/krt.h" | |
95616c82 OZ |
25 | #include "lib/socket.h" |
26 | #include "lib/string.h" | |
9ddbfbdd | 27 | #include "lib/hash.h" |
95616c82 OZ |
28 | #include "conf/conf.h" |
29 | ||
176fc68a | 30 | #include CONFIG_INCLUDE_NLSYS_H |
8988264a | 31 | |
8235c474 | 32 | #define krt_ipv4(p) ((p)->af == AF_INET) |
2feaa693 | 33 | |
517d05df OZ |
34 | const int rt_default_ecmp = 16; |
35 | ||
2feaa693 OZ |
36 | struct nl_parse_state |
37 | { | |
722daa95 | 38 | struct krt_proto *proto; |
2feaa693 OZ |
39 | struct linpool *pool; |
40 | int scan; | |
2feaa693 | 41 | |
722daa95 | 42 | u32 rta_flow; |
2feaa693 OZ |
43 | }; |
44 | ||
95616c82 OZ |
45 | /* |
46 | * Synchronous Netlink interface | |
47 | */ | |
48 | ||
49 | struct nl_sock | |
50 | { | |
51 | int fd; | |
52 | u32 seq; | |
53 | byte *rx_buffer; /* Receive buffer */ | |
54 | struct nlmsghdr *last_hdr; /* Recently received packet */ | |
ae80a2de | 55 | uint last_size; |
95616c82 OZ |
56 | }; |
57 | ||
e818f164 | 58 | #define NL_RX_SIZE 32768 |
95616c82 | 59 | |
2feaa693 OZ |
60 | #define NL_OP_DELETE 0 |
61 | #define NL_OP_ADD (NLM_F_CREATE|NLM_F_EXCL) | |
62 | #define NL_OP_REPLACE (NLM_F_CREATE|NLM_F_REPLACE) | |
63 | #define NL_OP_APPEND (NLM_F_CREATE|NLM_F_APPEND) | |
64 | ||
65 | static linpool *nl_linpool; | |
66 | ||
95616c82 OZ |
67 | static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */ |
68 | static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */ | |
69 | ||
70 | static void | |
71 | nl_open_sock(struct nl_sock *nl) | |
72 | { | |
73 | if (nl->fd < 0) | |
74 | { | |
75 | nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
76 | if (nl->fd < 0) | |
77 | die("Unable to open rtnetlink socket: %m"); | |
574b2324 | 78 | nl->seq = (u32) (current_time() TO_S); /* Or perhaps random_u32() ? */ |
95616c82 OZ |
79 | nl->rx_buffer = xmalloc(NL_RX_SIZE); |
80 | nl->last_hdr = NULL; | |
81 | nl->last_size = 0; | |
82 | } | |
83 | } | |
84 | ||
534d0a4b | 85 | static int |
ef614f29 | 86 | nl_set_strict_dump(struct nl_sock *nl UNUSED, int strict UNUSED) |
e818f164 | 87 | { |
bbc33f6e | 88 | #ifdef SOL_NETLINK |
534d0a4b OZ |
89 | return setsockopt(nl->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, &strict, sizeof(strict)); |
90 | #else | |
91 | return -1; | |
bbc33f6e | 92 | #endif |
e818f164 OZ |
93 | } |
94 | ||
81ee6cda OZ |
95 | static void |
96 | nl_set_rcvbuf(int fd, uint val) | |
97 | { | |
98 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &val, sizeof(val)) < 0) | |
99 | log(L_WARN "KRT: Cannot set netlink rx buffer size to %u: %m", val); | |
100 | } | |
101 | ||
102 | static uint | |
103 | nl_cfg_rx_buffer_size(struct config *cfg) | |
104 | { | |
105 | uint bufsize = 0; | |
106 | ||
107 | struct proto_config *pc; | |
108 | WALK_LIST(pc, cfg->protos) | |
109 | if ((pc->protocol == &proto_unix_kernel) && !pc->disabled) | |
110 | bufsize = MAX(bufsize, ((struct krt_config *) pc)->sys.netlink_rx_buffer); | |
111 | ||
112 | return bufsize; | |
113 | } | |
114 | ||
115 | ||
95616c82 OZ |
116 | static void |
117 | nl_open(void) | |
118 | { | |
534d0a4b OZ |
119 | if ((nl_scan.fd >= 0) && (nl_req.fd >= 0)) |
120 | return; | |
121 | ||
95616c82 OZ |
122 | nl_open_sock(&nl_scan); |
123 | nl_open_sock(&nl_req); | |
e818f164 | 124 | |
534d0a4b OZ |
125 | if (nl_set_strict_dump(&nl_scan, 1) < 0) |
126 | { | |
127 | log(L_WARN "KRT: Netlink strict checking failed, will scan all tables at once"); | |
128 | krt_use_shared_scan(); | |
129 | } | |
95616c82 OZ |
130 | } |
131 | ||
132 | static void | |
133 | nl_send(struct nl_sock *nl, struct nlmsghdr *nh) | |
134 | { | |
135 | struct sockaddr_nl sa; | |
136 | ||
137 | memset(&sa, 0, sizeof(sa)); | |
138 | sa.nl_family = AF_NETLINK; | |
139 | nh->nlmsg_pid = 0; | |
140 | nh->nlmsg_seq = ++(nl->seq); | |
53401bef | 141 | nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len); |
95616c82 OZ |
142 | if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0) |
143 | die("rtnetlink sendto: %m"); | |
144 | nl->last_hdr = NULL; | |
145 | } | |
146 | ||
147 | static void | |
e818f164 | 148 | nl_request_dump_link(void) |
95616c82 OZ |
149 | { |
150 | struct { | |
151 | struct nlmsghdr nh; | |
e818f164 | 152 | struct ifinfomsg ifi; |
641172c6 | 153 | } req = { |
e818f164 OZ |
154 | .nh.nlmsg_type = RTM_GETLINK, |
155 | .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), | |
641172c6 | 156 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, |
e818f164 OZ |
157 | .nh.nlmsg_seq = ++(nl_scan.seq), |
158 | .ifi.ifi_family = AF_UNSPEC, | |
641172c6 | 159 | }; |
e818f164 OZ |
160 | |
161 | send(nl_scan.fd, &req, sizeof(req), 0); | |
162 | nl_scan.last_hdr = NULL; | |
95616c82 OZ |
163 | } |
164 | ||
e818f164 OZ |
165 | static void |
166 | nl_request_dump_addr(int af) | |
167 | { | |
168 | struct { | |
169 | struct nlmsghdr nh; | |
170 | struct ifaddrmsg ifa; | |
171 | } req = { | |
172 | .nh.nlmsg_type = RTM_GETADDR, | |
173 | .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
174 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, | |
175 | .nh.nlmsg_seq = ++(nl_scan.seq), | |
176 | .ifa.ifa_family = af, | |
177 | }; | |
178 | ||
179 | send(nl_scan.fd, &req, sizeof(req), 0); | |
180 | nl_scan.last_hdr = NULL; | |
181 | } | |
182 | ||
183 | static void | |
534d0a4b | 184 | nl_request_dump_route(int af, int table_id) |
e818f164 OZ |
185 | { |
186 | struct { | |
187 | struct nlmsghdr nh; | |
188 | struct rtmsg rtm; | |
534d0a4b OZ |
189 | struct rtattr rta; |
190 | u32 table_id; | |
e818f164 OZ |
191 | } req = { |
192 | .nh.nlmsg_type = RTM_GETROUTE, | |
193 | .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
194 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, | |
195 | .nh.nlmsg_seq = ++(nl_scan.seq), | |
196 | .rtm.rtm_family = af, | |
197 | }; | |
198 | ||
534d0a4b OZ |
199 | if (table_id < 256) |
200 | req.rtm.rtm_table = table_id; | |
201 | else | |
202 | { | |
203 | req.rta.rta_type = RTA_TABLE; | |
204 | req.rta.rta_len = RTA_LENGTH(4); | |
205 | req.table_id = table_id; | |
206 | req.nh.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) + req.rta.rta_len; | |
207 | } | |
208 | ||
209 | send(nl_scan.fd, &req, req.nh.nlmsg_len, 0); | |
e818f164 OZ |
210 | nl_scan.last_hdr = NULL; |
211 | } | |
212 | ||
213 | ||
95616c82 OZ |
214 | static struct nlmsghdr * |
215 | nl_get_reply(struct nl_sock *nl) | |
216 | { | |
217 | for(;;) | |
218 | { | |
219 | if (!nl->last_hdr) | |
220 | { | |
221 | struct iovec iov = { nl->rx_buffer, NL_RX_SIZE }; | |
222 | struct sockaddr_nl sa; | |
31e9e101 ST |
223 | struct msghdr m = { |
224 | .msg_name = &sa, | |
225 | .msg_namelen = sizeof(sa), | |
226 | .msg_iov = &iov, | |
227 | .msg_iovlen = 1, | |
228 | }; | |
95616c82 OZ |
229 | int x = recvmsg(nl->fd, &m, 0); |
230 | if (x < 0) | |
231 | die("nl_get_reply: %m"); | |
232 | if (sa.nl_pid) /* It isn't from the kernel */ | |
233 | { | |
234 | DBG("Non-kernel packet\n"); | |
235 | continue; | |
236 | } | |
237 | nl->last_size = x; | |
238 | nl->last_hdr = (void *) nl->rx_buffer; | |
239 | if (m.msg_flags & MSG_TRUNC) | |
240 | bug("nl_get_reply: got truncated reply which should be impossible"); | |
241 | } | |
242 | if (NLMSG_OK(nl->last_hdr, nl->last_size)) | |
243 | { | |
244 | struct nlmsghdr *h = nl->last_hdr; | |
245 | nl->last_hdr = NLMSG_NEXT(h, nl->last_size); | |
246 | if (h->nlmsg_seq != nl->seq) | |
247 | { | |
248 | log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)", | |
249 | h->nlmsg_seq, nl->seq); | |
250 | continue; | |
251 | } | |
252 | return h; | |
253 | } | |
254 | if (nl->last_size) | |
255 | log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size); | |
256 | nl->last_hdr = NULL; | |
257 | } | |
258 | } | |
259 | ||
1123e707 | 260 | static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS; |
95616c82 OZ |
261 | |
262 | static int | |
2feaa693 | 263 | nl_error(struct nlmsghdr *h, int ignore_esrch) |
95616c82 OZ |
264 | { |
265 | struct nlmsgerr *e; | |
266 | int ec; | |
267 | ||
268 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
269 | { | |
270 | log(L_WARN "Netlink: Truncated error message received"); | |
271 | return ENOBUFS; | |
272 | } | |
273 | e = (struct nlmsgerr *) NLMSG_DATA(h); | |
176fc68a | 274 | ec = netlink_error_to_os(e->error); |
2feaa693 | 275 | if (ec && !(ignore_esrch && (ec == ESRCH))) |
95616c82 OZ |
276 | log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec)); |
277 | return ec; | |
278 | } | |
279 | ||
280 | static struct nlmsghdr * | |
281 | nl_get_scan(void) | |
282 | { | |
283 | struct nlmsghdr *h = nl_get_reply(&nl_scan); | |
284 | ||
285 | if (h->nlmsg_type == NLMSG_DONE) | |
286 | return NULL; | |
287 | if (h->nlmsg_type == NLMSG_ERROR) | |
288 | { | |
2feaa693 | 289 | nl_error(h, 0); |
95616c82 OZ |
290 | return NULL; |
291 | } | |
292 | return h; | |
293 | } | |
294 | ||
295 | static int | |
2feaa693 | 296 | nl_exchange(struct nlmsghdr *pkt, int ignore_esrch) |
95616c82 OZ |
297 | { |
298 | struct nlmsghdr *h; | |
299 | ||
300 | nl_send(&nl_req, pkt); | |
301 | for(;;) | |
302 | { | |
303 | h = nl_get_reply(&nl_req); | |
304 | if (h->nlmsg_type == NLMSG_ERROR) | |
305 | break; | |
306 | log(L_WARN "nl_exchange: Unexpected reply received"); | |
307 | } | |
2feaa693 | 308 | return nl_error(h, ignore_esrch) ? -1 : 0; |
95616c82 OZ |
309 | } |
310 | ||
311 | /* | |
312 | * Netlink attributes | |
313 | */ | |
314 | ||
315 | static int nl_attr_len; | |
316 | ||
317 | static void * | |
318 | nl_checkin(struct nlmsghdr *h, int lsize) | |
319 | { | |
320 | nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize); | |
321 | if (nl_attr_len < 0) | |
322 | { | |
323 | log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len); | |
324 | return NULL; | |
325 | } | |
326 | return NLMSG_DATA(h); | |
327 | } | |
328 | ||
ad276157 JMM |
329 | struct nl_want_attrs { |
330 | u8 defined:1; | |
331 | u8 checksize:1; | |
332 | u8 size; | |
333 | }; | |
334 | ||
335 | ||
336 | #define BIRD_IFLA_MAX (IFLA_WIRELESS+1) | |
337 | ||
338 | static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = { | |
339 | [IFLA_IFNAME] = { 1, 0, 0 }, | |
340 | [IFLA_MTU] = { 1, 1, sizeof(u32) }, | |
943478b0 | 341 | [IFLA_MASTER] = { 1, 1, sizeof(u32) }, |
ad276157 JMM |
342 | [IFLA_WIRELESS] = { 1, 0, 0 }, |
343 | }; | |
344 | ||
29a64162 | 345 | |
e37d2e3e | 346 | #define BIRD_IFA_MAX (IFA_FLAGS+1) |
ad276157 | 347 | |
ad276157 JMM |
348 | static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = { |
349 | [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) }, | |
350 | [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) }, | |
351 | [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) }, | |
62e64905 | 352 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 | 353 | }; |
29a64162 | 354 | |
ad276157 JMM |
355 | static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = { |
356 | [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) }, | |
357 | [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) }, | |
e37d2e3e | 358 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 | 359 | }; |
29a64162 | 360 | |
ad276157 | 361 | |
d14f8c3c | 362 | #define BIRD_RTA_MAX (RTA_ENCAP+1) |
ad276157 | 363 | |
4e276a89 | 364 | static struct nl_want_attrs nexthop_attr_want4[BIRD_RTA_MAX] = { |
ad276157 | 365 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, |
53401bef | 366 | [RTA_VIA] = { 1, 0, 0 }, |
21f9acd2 | 367 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, |
d14f8c3c JMM |
368 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
369 | [RTA_ENCAP] = { 1, 0, 0 }, | |
370 | }; | |
371 | ||
4ff15a75 | 372 | static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = { |
98bb80a2 | 373 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, |
53401bef | 374 | [RTA_VIA] = { 1, 0, 0 }, |
21f9acd2 | 375 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, |
4ff15a75 OZ |
376 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
377 | [RTA_ENCAP] = { 1, 0, 0 }, | |
378 | }; | |
379 | ||
6b0f5f68 | 380 | #ifdef HAVE_MPLS_KERNEL |
f1b5f179 KY |
381 | static struct nl_want_attrs nexthop_attr_want_mpls[BIRD_RTA_MAX] = { |
382 | [RTA_VIA] = { 1, 0, 0 }, | |
383 | [RTA_NEWDST] = { 1, 0, 0 }, | |
384 | }; | |
385 | ||
d14f8c3c JMM |
386 | static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = { |
387 | [RTA_DST] = { 1, 0, 0 }, | |
ad276157 | 388 | }; |
6b0f5f68 | 389 | #endif |
ad276157 | 390 | |
ad276157 JMM |
391 | static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = { |
392 | [RTA_DST] = { 1, 1, sizeof(ip4_addr) }, | |
393 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
394 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
395 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
396 | [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) }, | |
397 | [RTA_METRICS] = { 1, 0, 0 }, | |
398 | [RTA_MULTIPATH] = { 1, 0, 0 }, | |
399 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
400 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
53401bef | 401 | [RTA_VIA] = { 1, 0, 0 }, |
d14f8c3c JMM |
402 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
403 | [RTA_ENCAP] = { 1, 0, 0 }, | |
ad276157 | 404 | }; |
29a64162 | 405 | |
ad276157 JMM |
406 | static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = { |
407 | [RTA_DST] = { 1, 1, sizeof(ip6_addr) }, | |
be17805c | 408 | [RTA_SRC] = { 1, 1, sizeof(ip6_addr) }, |
ad276157 JMM |
409 | [RTA_IIF] = { 1, 1, sizeof(u32) }, |
410 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
411 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, | |
412 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
413 | [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) }, | |
414 | [RTA_METRICS] = { 1, 0, 0 }, | |
98bb80a2 | 415 | [RTA_MULTIPATH] = { 1, 0, 0 }, |
ad276157 JMM |
416 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, |
417 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
53401bef | 418 | [RTA_VIA] = { 1, 0, 0 }, |
d14f8c3c JMM |
419 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
420 | [RTA_ENCAP] = { 1, 0, 0 }, | |
421 | }; | |
422 | ||
6b0f5f68 | 423 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
424 | static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = { |
425 | [RTA_DST] = { 1, 1, sizeof(u32) }, | |
426 | [RTA_IIF] = { 1, 1, sizeof(u32) }, | |
427 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
428 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
429 | [RTA_METRICS] = { 1, 0, 0 }, | |
f1b5f179 | 430 | [RTA_MULTIPATH] = { 1, 0, 0 }, |
d14f8c3c JMM |
431 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, |
432 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
433 | [RTA_VIA] = { 1, 0, 0 }, | |
434 | [RTA_NEWDST] = { 1, 0, 0 }, | |
ad276157 | 435 | }; |
6b0f5f68 | 436 | #endif |
ad276157 JMM |
437 | |
438 | ||
95616c82 | 439 | static int |
ad276157 | 440 | nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize) |
95616c82 OZ |
441 | { |
442 | int max = ksize / sizeof(struct rtattr *); | |
443 | bzero(k, ksize); | |
ad276157 JMM |
444 | |
445 | for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len)) | |
95616c82 | 446 | { |
ad276157 JMM |
447 | if ((a->rta_type >= max) || !want[a->rta_type].defined) |
448 | continue; | |
449 | ||
450 | if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size)) | |
451 | { | |
9b136840 | 452 | log(L_ERR "nl_parse_attrs: Malformed attribute received"); |
ad276157 JMM |
453 | return 0; |
454 | } | |
455 | ||
456 | k[a->rta_type] = a; | |
95616c82 | 457 | } |
ad276157 | 458 | |
95616c82 OZ |
459 | if (nl_attr_len) |
460 | { | |
461 | log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len); | |
462 | return 0; | |
463 | } | |
ad276157 JMM |
464 | |
465 | return 1; | |
95616c82 OZ |
466 | } |
467 | ||
d14f8c3c JMM |
468 | static inline u16 rta_get_u16(struct rtattr *a) |
469 | { return *(u16 *) RTA_DATA(a); } | |
470 | ||
fce764f9 | 471 | static inline u32 rta_get_u32(struct rtattr *a) |
acb04cfd OZ |
472 | { return *(u32 *) RTA_DATA(a); } |
473 | ||
474 | static inline ip4_addr rta_get_ip4(struct rtattr *a) | |
475 | { return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); } | |
476 | ||
477 | static inline ip6_addr rta_get_ip6(struct rtattr *a) | |
478 | { return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); } | |
479 | ||
9b136840 JMM |
480 | static inline ip_addr rta_get_ipa(struct rtattr *a) |
481 | { | |
482 | if (RTA_PAYLOAD(a) == sizeof(ip4_addr)) | |
483 | return ipa_from_ip4(rta_get_ip4(a)); | |
484 | else | |
485 | return ipa_from_ip6(rta_get_ip6(a)); | |
486 | } | |
acb04cfd | 487 | |
6b0f5f68 | 488 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
489 | static inline ip_addr rta_get_via(struct rtattr *a) |
490 | { | |
491 | struct rtvia *v = RTA_DATA(a); | |
492 | switch(v->rtvia_family) { | |
493 | case AF_INET: return ipa_from_ip4(ip4_ntoh(*(ip4_addr *) v->rtvia_addr)); | |
494 | case AF_INET6: return ipa_from_ip6(ip6_ntoh(*(ip6_addr *) v->rtvia_addr)); | |
495 | } | |
496 | return IPA_NONE; | |
497 | } | |
498 | ||
499 | static u32 rta_mpls_stack[MPLS_MAX_LABEL_STACK]; | |
500 | static inline int rta_get_mpls(struct rtattr *a, u32 *stack) | |
501 | { | |
2eaf65ec OZ |
502 | if (!a) |
503 | return 0; | |
504 | ||
d14f8c3c JMM |
505 | if (RTA_PAYLOAD(a) % 4) |
506 | log(L_WARN "KRT: Strange length of received MPLS stack: %u", RTA_PAYLOAD(a)); | |
507 | ||
2eaf65ec OZ |
508 | int labels = mpls_get(RTA_DATA(a), RTA_PAYLOAD(a) & ~0x3, stack); |
509 | ||
510 | if (labels < 0) | |
511 | { | |
512 | log(L_WARN "KRT: Too long MPLS stack received, ignoring"); | |
513 | labels = 0; | |
514 | } | |
515 | ||
516 | return labels; | |
d14f8c3c | 517 | } |
6b0f5f68 | 518 | #endif |
d14f8c3c | 519 | |
9fdf9d29 OZ |
520 | struct rtattr * |
521 | nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen) | |
95616c82 | 522 | { |
9fdf9d29 OZ |
523 | uint pos = NLMSG_ALIGN(h->nlmsg_len); |
524 | uint len = RTA_LENGTH(dlen); | |
95616c82 OZ |
525 | |
526 | if (pos + len > bufsize) | |
527 | bug("nl_add_attr: packet buffer overflow"); | |
9fdf9d29 OZ |
528 | |
529 | struct rtattr *a = (struct rtattr *)((char *)h + pos); | |
95616c82 OZ |
530 | a->rta_type = code; |
531 | a->rta_len = len; | |
532 | h->nlmsg_len = pos + len; | |
9fdf9d29 OZ |
533 | |
534 | if (dlen > 0) | |
535 | memcpy(RTA_DATA(a), data, dlen); | |
536 | ||
537 | return a; | |
95616c82 OZ |
538 | } |
539 | ||
d14f8c3c JMM |
540 | static inline struct rtattr * |
541 | nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code) | |
542 | { | |
543 | return nl_add_attr(h, bufsize, code, NULL, 0); | |
544 | } | |
545 | ||
546 | static inline void | |
547 | nl_close_attr(struct nlmsghdr *h, struct rtattr *a) | |
548 | { | |
549 | a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a; | |
550 | } | |
551 | ||
552 | static inline void | |
553 | nl_add_attr_u16(struct nlmsghdr *h, uint bufsize, int code, u16 data) | |
554 | { | |
555 | nl_add_attr(h, bufsize, code, &data, 2); | |
556 | } | |
557 | ||
95616c82 | 558 | static inline void |
29a64162 | 559 | nl_add_attr_u32(struct nlmsghdr *h, uint bufsize, int code, u32 data) |
95616c82 OZ |
560 | { |
561 | nl_add_attr(h, bufsize, code, &data, 4); | |
562 | } | |
563 | ||
564 | static inline void | |
29a64162 | 565 | nl_add_attr_ip4(struct nlmsghdr *h, uint bufsize, int code, ip4_addr ip4) |
95616c82 | 566 | { |
29a64162 OZ |
567 | ip4 = ip4_hton(ip4); |
568 | nl_add_attr(h, bufsize, code, &ip4, sizeof(ip4)); | |
569 | } | |
570 | ||
571 | static inline void | |
572 | nl_add_attr_ip6(struct nlmsghdr *h, uint bufsize, int code, ip6_addr ip6) | |
573 | { | |
574 | ip6 = ip6_hton(ip6); | |
575 | nl_add_attr(h, bufsize, code, &ip6, sizeof(ip6)); | |
576 | } | |
577 | ||
578 | static inline void | |
579 | nl_add_attr_ipa(struct nlmsghdr *h, uint bufsize, int code, ip_addr ipa) | |
580 | { | |
581 | if (ipa_is_ip4(ipa)) | |
582 | nl_add_attr_ip4(h, bufsize, code, ipa_to_ip4(ipa)); | |
9b136840 | 583 | else |
29a64162 | 584 | nl_add_attr_ip6(h, bufsize, code, ipa_to_ip6(ipa)); |
95616c82 OZ |
585 | } |
586 | ||
6b0f5f68 | 587 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
588 | static inline void |
589 | nl_add_attr_mpls(struct nlmsghdr *h, uint bufsize, int code, int len, u32 *stack) | |
9fdf9d29 | 590 | { |
d14f8c3c JMM |
591 | char buf[len*4]; |
592 | mpls_put(buf, len, stack); | |
593 | nl_add_attr(h, bufsize, code, buf, len*4); | |
9fdf9d29 | 594 | } |
95616c82 OZ |
595 | |
596 | static inline void | |
d14f8c3c | 597 | nl_add_attr_mpls_encap(struct nlmsghdr *h, uint bufsize, int len, u32 *stack) |
95616c82 | 598 | { |
d14f8c3c JMM |
599 | nl_add_attr_u16(h, bufsize, RTA_ENCAP_TYPE, LWTUNNEL_ENCAP_MPLS); |
600 | ||
601 | struct rtattr *nest = nl_open_attr(h, bufsize, RTA_ENCAP); | |
602 | nl_add_attr_mpls(h, bufsize, RTA_DST, len, stack); | |
603 | nl_close_attr(h, nest); | |
604 | } | |
605 | ||
606 | static inline void | |
607 | nl_add_attr_via(struct nlmsghdr *h, uint bufsize, ip_addr ipa) | |
608 | { | |
66acbc8d | 609 | struct rtvia *via = alloca(sizeof(struct rtvia) + 16); |
d14f8c3c | 610 | |
62e64905 OZ |
611 | if (ipa_is_ip4(ipa)) |
612 | { | |
d14f8c3c | 613 | via->rtvia_family = AF_INET; |
62e64905 | 614 | put_ip4(via->rtvia_addr, ipa_to_ip4(ipa)); |
66acbc8d | 615 | nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 4); |
62e64905 OZ |
616 | } |
617 | else | |
618 | { | |
d14f8c3c | 619 | via->rtvia_family = AF_INET6; |
62e64905 | 620 | put_ip6(via->rtvia_addr, ipa_to_ip6(ipa)); |
66acbc8d | 621 | nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 16); |
d14f8c3c | 622 | } |
95616c82 | 623 | } |
6b0f5f68 | 624 | #endif |
95616c82 | 625 | |
9fdf9d29 OZ |
626 | static inline struct rtnexthop * |
627 | nl_open_nexthop(struct nlmsghdr *h, uint bufsize) | |
628 | { | |
629 | uint pos = NLMSG_ALIGN(h->nlmsg_len); | |
630 | uint len = RTNH_LENGTH(0); | |
631 | ||
632 | if (pos + len > bufsize) | |
633 | bug("nl_open_nexthop: packet buffer overflow"); | |
634 | ||
635 | h->nlmsg_len = pos + len; | |
636 | ||
637 | return (void *)h + pos; | |
638 | } | |
639 | ||
640 | static inline void | |
641 | nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh) | |
642 | { | |
643 | nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh; | |
644 | } | |
95616c82 | 645 | |
d14f8c3c | 646 | static inline void |
6b0f5f68 | 647 | nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af UNUSED) |
d14f8c3c | 648 | { |
6b0f5f68 | 649 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
650 | if (nh->labels > 0) |
651 | if (af == AF_MPLS) | |
652 | nl_add_attr_mpls(h, bufsize, RTA_NEWDST, nh->labels, nh->label); | |
653 | else | |
654 | nl_add_attr_mpls_encap(h, bufsize, nh->labels, nh->label); | |
655 | ||
656 | if (ipa_nonzero(nh->gw)) | |
53401bef OZ |
657 | { |
658 | if (af == (ipa_is_ip4(nh->gw) ? AF_INET : AF_INET6)) | |
d14f8c3c | 659 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); |
53401bef OZ |
660 | else |
661 | nl_add_attr_via(h, bufsize, nh->gw); | |
662 | } | |
6b0f5f68 MJM |
663 | #else |
664 | ||
665 | if (ipa_nonzero(nh->gw)) | |
666 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); | |
667 | #endif | |
d14f8c3c JMM |
668 | } |
669 | ||
95616c82 | 670 | static void |
21f9acd2 | 671 | nl_add_multipath(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af, ea_list *eattrs) |
95616c82 | 672 | { |
9fdf9d29 | 673 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH); |
21f9acd2 | 674 | eattr *flow = ea_find(eattrs, EA_KRT_REALM); |
9fdf9d29 | 675 | |
95616c82 | 676 | for (; nh; nh = nh->next) |
9fdf9d29 OZ |
677 | { |
678 | struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize); | |
95616c82 | 679 | |
9fdf9d29 OZ |
680 | rtnh->rtnh_flags = 0; |
681 | rtnh->rtnh_hops = nh->weight; | |
682 | rtnh->rtnh_ifindex = nh->iface->index; | |
95616c82 | 683 | |
d14f8c3c | 684 | nl_add_nexthop(h, bufsize, nh, af); |
95616c82 | 685 | |
a1f5e514 OZ |
686 | if (nh->flags & RNF_ONLINK) |
687 | rtnh->rtnh_flags |= RTNH_F_ONLINK; | |
688 | ||
21f9acd2 OZ |
689 | /* Our KRT_REALM is per-route, but kernel RTA_FLOW is per-nexthop. |
690 | Therefore, we need to attach the same attribute to each nexthop. */ | |
691 | if (flow) | |
692 | nl_add_attr_u32(h, bufsize, RTA_FLOW, flow->u.data); | |
693 | ||
9fdf9d29 OZ |
694 | nl_close_nexthop(h, rtnh); |
695 | } | |
696 | ||
697 | nl_close_attr(h, a); | |
698 | } | |
95616c82 | 699 | |
4e276a89 | 700 | static struct nexthop * |
f5c8fb5f | 701 | nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, const net_addr *n, struct rtattr *ra, int af, int krt_src) |
95616c82 | 702 | { |
ad276157 | 703 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 | 704 | struct rtnexthop *nh = RTA_DATA(ra); |
4e276a89 | 705 | struct nexthop *rv, *first, **last; |
3e236955 | 706 | unsigned len = RTA_PAYLOAD(ra); |
95616c82 OZ |
707 | |
708 | first = NULL; | |
709 | last = &first; | |
95616c82 OZ |
710 | |
711 | while (len) | |
712 | { | |
713 | /* Use RTNH_OK(nh,len) ?? */ | |
714 | if ((len < sizeof(*nh)) || (len < nh->rtnh_len)) | |
77d032c7 | 715 | goto err; |
95616c82 | 716 | |
f5c8fb5f | 717 | if ((nh->rtnh_flags & RTNH_F_DEAD) && (krt_src != KRT_SRC_BIRD)) |
df83f626 OZ |
718 | goto next; |
719 | ||
3e792350 | 720 | *last = rv = lp_allocz(s->pool, NEXTHOP_MAX_SIZE); |
95616c82 OZ |
721 | last = &(rv->next); |
722 | ||
723 | rv->weight = nh->rtnh_hops; | |
724 | rv->iface = if_find_by_index(nh->rtnh_ifindex); | |
725 | if (!rv->iface) | |
77d032c7 OZ |
726 | { |
727 | log(L_ERR "KRT: Received route %N with unknown ifindex %u", n, nh->rtnh_ifindex); | |
728 | return NULL; | |
729 | } | |
95616c82 OZ |
730 | |
731 | /* Nonexistent RTNH_PAYLOAD ?? */ | |
732 | nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0); | |
98bb80a2 OZ |
733 | switch (af) |
734 | { | |
98bb80a2 | 735 | case AF_INET: |
4ff15a75 | 736 | if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want4, a, sizeof(a))) |
77d032c7 | 737 | goto err; |
98bb80a2 | 738 | break; |
4ff15a75 | 739 | |
98bb80a2 | 740 | case AF_INET6: |
4ff15a75 | 741 | if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want6, a, sizeof(a))) |
77d032c7 | 742 | goto err; |
98bb80a2 | 743 | break; |
4ff15a75 | 744 | |
f1b5f179 KY |
745 | #ifdef HAVE_MPLS_KERNEL |
746 | case AF_MPLS: | |
747 | if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want_mpls, a, sizeof(a))) | |
77d032c7 | 748 | goto err; |
f1b5f179 KY |
749 | |
750 | if (a[RTA_NEWDST]) | |
751 | rv->labels = rta_get_mpls(a[RTA_NEWDST], rv->label); | |
752 | ||
753 | break; | |
754 | #endif | |
755 | ||
98bb80a2 | 756 | default: |
77d032c7 | 757 | goto err; |
98bb80a2 OZ |
758 | } |
759 | ||
95616c82 | 760 | if (a[RTA_GATEWAY]) |
53401bef | 761 | rv->gw = rta_get_ipa(a[RTA_GATEWAY]); |
95616c82 | 762 | |
21f9acd2 OZ |
763 | if (a[RTA_FLOW]) |
764 | s->rta_flow = rta_get_u32(a[RTA_FLOW]); | |
765 | ||
53401bef OZ |
766 | #ifdef HAVE_MPLS_KERNEL |
767 | if (a[RTA_VIA]) | |
768 | rv->gw = rta_get_via(a[RTA_VIA]); | |
769 | #endif | |
770 | ||
32425297 OZ |
771 | if (nh->rtnh_flags & RTNH_F_ONLINK) |
772 | rv->flags |= RNF_ONLINK; | |
773 | ||
53401bef OZ |
774 | if (ipa_nonzero(rv->gw)) |
775 | { | |
23c212e7 | 776 | neighbor *nbr; |
586c1800 OZ |
777 | nbr = neigh_find(&p->p, rv->gw, rv->iface, |
778 | (rv->flags & RNF_ONLINK) ? NEF_ONLINK : 0); | |
23c212e7 | 779 | if (!nbr || (nbr->scope == SCOPE_HOST)) |
77d032c7 OZ |
780 | { |
781 | log(L_ERR "KRT: Received route %N with strange next-hop %I", n, rv->gw); | |
782 | return NULL; | |
783 | } | |
95616c82 | 784 | } |
62e64905 | 785 | |
6b0f5f68 | 786 | #ifdef HAVE_MPLS_KERNEL |
2eaf65ec | 787 | if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE]) |
6b0f5f68 | 788 | { |
77d032c7 OZ |
789 | if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) |
790 | { | |
791 | log(L_WARN "KRT: Received route %N with unknown encapsulation method %d", | |
792 | n, rta_get_u16(a[RTA_ENCAP_TYPE])); | |
6b0f5f68 | 793 | return NULL; |
d14f8c3c JMM |
794 | } |
795 | ||
6b0f5f68 MJM |
796 | struct rtattr *enca[BIRD_RTA_MAX]; |
797 | nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]); | |
798 | nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca)); | |
799 | rv->labels = rta_get_mpls(enca[RTA_DST], rv->label); | |
6b0f5f68 MJM |
800 | } |
801 | #endif | |
802 | ||
df83f626 | 803 | next: |
95616c82 OZ |
804 | len -= NLMSG_ALIGN(nh->rtnh_len); |
805 | nh = RTNH_NEXT(nh); | |
806 | } | |
807 | ||
59d3a361 OZ |
808 | /* Ensure nexthops are sorted to satisfy nest invariant */ |
809 | if (!nexthop_is_sorted(first)) | |
810 | first = nexthop_sort(first); | |
811 | ||
95616c82 | 812 | return first; |
77d032c7 OZ |
813 | |
814 | err: | |
815 | log(L_ERR "KRT: Received strange multipath route %N", n); | |
816 | return NULL; | |
95616c82 OZ |
817 | } |
818 | ||
9fdf9d29 OZ |
819 | static void |
820 | nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max) | |
821 | { | |
822 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS); | |
823 | int t; | |
824 | ||
825 | for (t = 1; t < max; t++) | |
826 | if (metrics[0] & (1 << t)) | |
827 | nl_add_attr_u32(h, bufsize, t, metrics[t]); | |
828 | ||
829 | nl_close_attr(h, a); | |
830 | } | |
831 | ||
832 | static int | |
833 | nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max) | |
834 | { | |
835 | struct rtattr *a = RTA_DATA(hdr); | |
836 | int len = RTA_PAYLOAD(hdr); | |
837 | ||
838 | metrics[0] = 0; | |
839 | for (; RTA_OK(a, len); a = RTA_NEXT(a, len)) | |
840 | { | |
841 | if (a->rta_type == RTA_UNSPEC) | |
842 | continue; | |
843 | ||
844 | if (a->rta_type >= max) | |
845 | continue; | |
846 | ||
847 | if (RTA_PAYLOAD(a) != 4) | |
848 | return -1; | |
849 | ||
850 | metrics[0] |= 1 << a->rta_type; | |
acb04cfd | 851 | metrics[a->rta_type] = rta_get_u32(a); |
9fdf9d29 OZ |
852 | } |
853 | ||
854 | if (len > 0) | |
855 | return -1; | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
95616c82 OZ |
860 | |
861 | /* | |
862 | * Scanning of interfaces | |
863 | */ | |
864 | ||
865 | static void | |
866 | nl_parse_link(struct nlmsghdr *h, int scan) | |
867 | { | |
868 | struct ifinfomsg *i; | |
ad276157 | 869 | struct rtattr *a[BIRD_IFLA_MAX]; |
95616c82 OZ |
870 | int new = h->nlmsg_type == RTM_NEWLINK; |
871 | struct iface f = {}; | |
872 | struct iface *ifi; | |
873 | char *name; | |
943478b0 | 874 | u32 mtu, master = 0; |
ae80a2de | 875 | uint fl; |
95616c82 | 876 | |
ad276157 | 877 | if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a))) |
95616c82 | 878 | return; |
ad276157 | 879 | if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU]) |
95616c82 | 880 | { |
ad276157 JMM |
881 | /* |
882 | * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come | |
883 | * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists. | |
884 | * We simply ignore all such messages with IFLA_WIRELESS without notice. | |
885 | */ | |
886 | ||
887 | if (a[IFLA_WIRELESS]) | |
888 | return; | |
889 | ||
890 | log(L_ERR "KIF: Malformed message received"); | |
95616c82 OZ |
891 | return; |
892 | } | |
ad276157 | 893 | |
95616c82 | 894 | name = RTA_DATA(a[IFLA_IFNAME]); |
acb04cfd | 895 | mtu = rta_get_u32(a[IFLA_MTU]); |
95616c82 | 896 | |
943478b0 OZ |
897 | if (a[IFLA_MASTER]) |
898 | master = rta_get_u32(a[IFLA_MASTER]); | |
899 | ||
95616c82 OZ |
900 | ifi = if_find_by_index(i->ifi_index); |
901 | if (!new) | |
902 | { | |
903 | DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name); | |
904 | if (!ifi) | |
905 | return; | |
906 | ||
907 | if_delete(ifi); | |
908 | } | |
909 | else | |
910 | { | |
911 | DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags); | |
912 | if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1)) | |
913 | if_delete(ifi); | |
914 | ||
915 | strncpy(f.name, name, sizeof(f.name)-1); | |
916 | f.index = i->ifi_index; | |
917 | f.mtu = mtu; | |
918 | ||
943478b0 OZ |
919 | f.master_index = master; |
920 | f.master = if_find_by_index(master); | |
921 | ||
95616c82 OZ |
922 | fl = i->ifi_flags; |
923 | if (fl & IFF_UP) | |
924 | f.flags |= IF_ADMIN_UP; | |
925 | if (fl & IFF_LOWER_UP) | |
926 | f.flags |= IF_LINK_UP; | |
927 | if (fl & IFF_LOOPBACK) /* Loopback */ | |
928 | f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE; | |
929 | else if (fl & IFF_POINTOPOINT) /* PtP */ | |
930 | f.flags |= IF_MULTICAST; | |
931 | else if (fl & IFF_BROADCAST) /* Broadcast */ | |
932 | f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST; | |
933 | else | |
934 | f.flags |= IF_MULTIACCESS; /* NBMA */ | |
3216eb03 | 935 | |
16a3254c OZ |
936 | if (fl & IFF_MULTICAST) |
937 | f.flags |= IF_MULTICAST; | |
938 | ||
3216eb03 OZ |
939 | ifi = if_update(&f); |
940 | ||
941 | if (!scan) | |
942 | if_end_partial_update(ifi); | |
95616c82 OZ |
943 | } |
944 | } | |
945 | ||
946 | static void | |
9b136840 | 947 | nl_parse_addr4(struct ifaddrmsg *i, int scan, int new) |
95616c82 | 948 | { |
ad276157 | 949 | struct rtattr *a[BIRD_IFA_MAX]; |
95616c82 | 950 | struct iface *ifi; |
e37d2e3e | 951 | u32 ifa_flags; |
95616c82 OZ |
952 | int scope; |
953 | ||
9b136840 | 954 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a))) |
95616c82 | 955 | return; |
ad276157 | 956 | |
9b136840 | 957 | if (!a[IFA_LOCAL]) |
ad276157 | 958 | { |
9b136840 JMM |
959 | log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)"); |
960 | return; | |
ad276157 | 961 | } |
ad276157 | 962 | if (!a[IFA_ADDRESS]) |
95616c82 | 963 | { |
ad276157 | 964 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); |
95616c82 OZ |
965 | return; |
966 | } | |
967 | ||
968 | ifi = if_find_by_index(i->ifa_index); | |
969 | if (!ifi) | |
970 | { | |
971 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
972 | return; | |
973 | } | |
974 | ||
e37d2e3e OZ |
975 | if (a[IFA_FLAGS]) |
976 | ifa_flags = rta_get_u32(a[IFA_FLAGS]); | |
977 | else | |
978 | ifa_flags = i->ifa_flags; | |
979 | ||
9b136840 | 980 | struct ifa ifa; |
95616c82 OZ |
981 | bzero(&ifa, sizeof(ifa)); |
982 | ifa.iface = ifi; | |
cc5b93f7 | 983 | if (ifa_flags & IFA_F_SECONDARY) |
95616c82 OZ |
984 | ifa.flags |= IA_SECONDARY; |
985 | ||
9b136840 JMM |
986 | ifa.ip = rta_get_ipa(a[IFA_LOCAL]); |
987 | ||
d7661fbe | 988 | if (i->ifa_prefixlen > IP4_MAX_PREFIX_LENGTH) |
95616c82 OZ |
989 | { |
990 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
991 | new = 0; | |
992 | } | |
d7661fbe | 993 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH) |
95616c82 | 994 | { |
9b136840 JMM |
995 | ifa.brd = rta_get_ipa(a[IFA_ADDRESS]); |
996 | net_fill_ip4(&ifa.prefix, rta_get_ip4(a[IFA_ADDRESS]), i->ifa_prefixlen); | |
95616c82 OZ |
997 | |
998 | /* It is either a host address or a peer address */ | |
9b136840 | 999 | if (ipa_equal(ifa.ip, ifa.brd)) |
95616c82 OZ |
1000 | ifa.flags |= IA_HOST; |
1001 | else | |
1002 | { | |
1003 | ifa.flags |= IA_PEER; | |
9b136840 | 1004 | ifa.opposite = ifa.brd; |
95616c82 OZ |
1005 | } |
1006 | } | |
1007 | else | |
1008 | { | |
9b136840 JMM |
1009 | net_fill_ip4(&ifa.prefix, ipa_to_ip4(ifa.ip), i->ifa_prefixlen); |
1010 | net_normalize(&ifa.prefix); | |
1011 | ||
d7661fbe | 1012 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 1) |
95616c82 OZ |
1013 | ifa.opposite = ipa_opposite_m1(ifa.ip); |
1014 | ||
d7661fbe | 1015 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 2) |
95616c82 OZ |
1016 | ifa.opposite = ipa_opposite_m2(ifa.ip); |
1017 | ||
e2630a49 OZ |
1018 | if (ifi->flags & IF_BROADCAST) |
1019 | { | |
1020 | /* If kernel offers us a broadcast address, we trust it */ | |
1021 | if (a[IFA_BROADCAST]) | |
1022 | ifa.brd = ipa_from_ip4(rta_get_ip4(a[IFA_BROADCAST])); | |
1023 | /* Otherwise we create one (except for /31) */ | |
1024 | else if (i->ifa_prefixlen < (IP4_MAX_PREFIX_LENGTH - 1)) | |
1025 | ifa.brd = ipa_from_ip4(ip4_or(ipa_to_ip4(ifa.ip), | |
1026 | ip4_not(ip4_mkmask(i->ifa_prefixlen)))); | |
9b136840 JMM |
1027 | } |
1028 | } | |
1029 | ||
1030 | scope = ipa_classify(ifa.ip); | |
1031 | if (scope < 0) | |
1032 | { | |
1033 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
1034 | return; | |
1035 | } | |
1036 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
1037 | ||
1038 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n", | |
1039 | ifi->index, ifi->name, | |
1040 | new ? "added" : "removed", | |
4659b2ae | 1041 | ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite); |
9b136840 JMM |
1042 | |
1043 | if (new) | |
1044 | ifa_update(&ifa); | |
1045 | else | |
1046 | ifa_delete(&ifa); | |
1047 | ||
1048 | if (!scan) | |
1049 | if_end_partial_update(ifi); | |
1050 | } | |
1051 | ||
1052 | static void | |
1053 | nl_parse_addr6(struct ifaddrmsg *i, int scan, int new) | |
1054 | { | |
1055 | struct rtattr *a[BIRD_IFA_MAX]; | |
1056 | struct iface *ifi; | |
cc5b93f7 | 1057 | u32 ifa_flags; |
9b136840 JMM |
1058 | int scope; |
1059 | ||
1060 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a))) | |
1061 | return; | |
1062 | ||
1063 | if (!a[IFA_ADDRESS]) | |
1064 | { | |
1065 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); | |
1066 | return; | |
1067 | } | |
1068 | ||
1069 | ifi = if_find_by_index(i->ifa_index); | |
1070 | if (!ifi) | |
1071 | { | |
1072 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
1073 | return; | |
1074 | } | |
1075 | ||
cc5b93f7 OZ |
1076 | if (a[IFA_FLAGS]) |
1077 | ifa_flags = rta_get_u32(a[IFA_FLAGS]); | |
1078 | else | |
1079 | ifa_flags = i->ifa_flags; | |
1080 | ||
9b136840 JMM |
1081 | struct ifa ifa; |
1082 | bzero(&ifa, sizeof(ifa)); | |
1083 | ifa.iface = ifi; | |
e37d2e3e | 1084 | if (ifa_flags & IFA_F_SECONDARY) |
9b136840 JMM |
1085 | ifa.flags |= IA_SECONDARY; |
1086 | ||
e37d2e3e OZ |
1087 | /* Ignore tentative addresses silently */ |
1088 | if (ifa_flags & IFA_F_TENTATIVE) | |
1089 | return; | |
9b136840 | 1090 | |
95616c82 | 1091 | /* IFA_LOCAL can be unset for IPv6 interfaces */ |
9b136840 JMM |
1092 | ifa.ip = rta_get_ipa(a[IFA_LOCAL] ? : a[IFA_ADDRESS]); |
1093 | ||
d7661fbe | 1094 | if (i->ifa_prefixlen > IP6_MAX_PREFIX_LENGTH) |
9b136840 JMM |
1095 | { |
1096 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
1097 | new = 0; | |
1098 | } | |
d7661fbe | 1099 | if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH) |
9b136840 JMM |
1100 | { |
1101 | ifa.brd = rta_get_ipa(a[IFA_ADDRESS]); | |
1102 | net_fill_ip6(&ifa.prefix, rta_get_ip6(a[IFA_ADDRESS]), i->ifa_prefixlen); | |
1103 | ||
1104 | /* It is either a host address or a peer address */ | |
1105 | if (ipa_equal(ifa.ip, ifa.brd)) | |
1106 | ifa.flags |= IA_HOST; | |
1107 | else | |
1108 | { | |
1109 | ifa.flags |= IA_PEER; | |
1110 | ifa.opposite = ifa.brd; | |
95616c82 | 1111 | } |
9b136840 JMM |
1112 | } |
1113 | else | |
1114 | { | |
1115 | net_fill_ip6(&ifa.prefix, ipa_to_ip6(ifa.ip), i->ifa_prefixlen); | |
1116 | net_normalize(&ifa.prefix); | |
1117 | ||
d7661fbe | 1118 | if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH - 1) |
9b136840 | 1119 | ifa.opposite = ipa_opposite_m1(ifa.ip); |
95616c82 OZ |
1120 | } |
1121 | ||
1122 | scope = ipa_classify(ifa.ip); | |
1123 | if (scope < 0) | |
1124 | { | |
1125 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
1126 | return; | |
1127 | } | |
1128 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
1129 | ||
9b136840 | 1130 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n", |
95616c82 OZ |
1131 | ifi->index, ifi->name, |
1132 | new ? "added" : "removed", | |
4659b2ae | 1133 | ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite); |
3216eb03 | 1134 | |
95616c82 OZ |
1135 | if (new) |
1136 | ifa_update(&ifa); | |
1137 | else | |
1138 | ifa_delete(&ifa); | |
3216eb03 OZ |
1139 | |
1140 | if (!scan) | |
1141 | if_end_partial_update(ifi); | |
95616c82 OZ |
1142 | } |
1143 | ||
9b136840 JMM |
1144 | static void |
1145 | nl_parse_addr(struct nlmsghdr *h, int scan) | |
1146 | { | |
1147 | struct ifaddrmsg *i; | |
1148 | ||
1149 | if (!(i = nl_checkin(h, sizeof(*i)))) | |
1150 | return; | |
1151 | ||
1152 | int new = (h->nlmsg_type == RTM_NEWADDR); | |
1153 | ||
1154 | switch (i->ifa_family) | |
1155 | { | |
9b136840 JMM |
1156 | case AF_INET: |
1157 | return nl_parse_addr4(i, scan, new); | |
29a64162 | 1158 | |
9b136840 JMM |
1159 | case AF_INET6: |
1160 | return nl_parse_addr6(i, scan, new); | |
9b136840 JMM |
1161 | } |
1162 | } | |
1163 | ||
95616c82 OZ |
1164 | void |
1165 | kif_do_scan(struct kif_proto *p UNUSED) | |
1166 | { | |
1167 | struct nlmsghdr *h; | |
1168 | ||
1169 | if_start_update(); | |
1170 | ||
e818f164 | 1171 | nl_request_dump_link(); |
95616c82 OZ |
1172 | while (h = nl_get_scan()) |
1173 | if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK) | |
1174 | nl_parse_link(h, 1); | |
1175 | else | |
1176 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1177 | |
943478b0 OZ |
1178 | /* Re-resolve master interface for slaves */ |
1179 | struct iface *i; | |
1180 | WALK_LIST(i, iface_list) | |
1181 | if (i->master_index) | |
1182 | { | |
1183 | struct iface f = { | |
1184 | .flags = i->flags, | |
1185 | .mtu = i->mtu, | |
1186 | .index = i->index, | |
1187 | .master_index = i->master_index, | |
1188 | .master = if_find_by_index(i->master_index) | |
1189 | }; | |
1190 | ||
1191 | if (f.master != i->master) | |
1192 | { | |
1193 | memcpy(f.name, i->name, sizeof(f.name)); | |
1194 | if_update(&f); | |
1195 | } | |
1196 | } | |
1197 | ||
e818f164 | 1198 | nl_request_dump_addr(AF_INET); |
95616c82 OZ |
1199 | while (h = nl_get_scan()) |
1200 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
3216eb03 | 1201 | nl_parse_addr(h, 1); |
95616c82 OZ |
1202 | else |
1203 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1204 | |
e818f164 | 1205 | nl_request_dump_addr(AF_INET6); |
d7661fbe JMM |
1206 | while (h = nl_get_scan()) |
1207 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
1208 | nl_parse_addr(h, 1); | |
1209 | else | |
1210 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1211 | |
95616c82 OZ |
1212 | if_end_update(); |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Routes | |
1217 | */ | |
1218 | ||
9ddbfbdd JMM |
1219 | static inline u32 |
1220 | krt_table_id(struct krt_proto *p) | |
1221 | { | |
1222 | return KRT_CF->sys.table_id; | |
1223 | } | |
1224 | ||
1225 | static HASH(struct krt_proto) nl_table_map; | |
1226 | ||
29a64162 OZ |
1227 | #define RTH_KEY(p) p->af, krt_table_id(p) |
1228 | #define RTH_NEXT(p) p->sys.hash_next | |
1229 | #define RTH_EQ(a1,i1,a2,i2) a1 == a2 && i1 == i2 | |
1230 | #define RTH_FN(a,i) a ^ u32_hash(i) | |
9ddbfbdd JMM |
1231 | |
1232 | #define RTH_REHASH rth_rehash | |
1233 | #define RTH_PARAMS /8, *2, 2, 2, 6, 20 | |
1234 | ||
1235 | HASH_DEFINE_REHASH_FN(RTH, struct krt_proto) | |
95616c82 OZ |
1236 | |
1237 | int | |
1238 | krt_capable(rte *e) | |
1239 | { | |
1240 | rta *a = e->attrs; | |
1241 | ||
95616c82 | 1242 | switch (a->dest) |
62e64905 | 1243 | { |
4e276a89 | 1244 | case RTD_UNICAST: |
95616c82 OZ |
1245 | case RTD_BLACKHOLE: |
1246 | case RTD_UNREACHABLE: | |
1247 | case RTD_PROHIBIT: | |
62e64905 OZ |
1248 | return 1; |
1249 | ||
95616c82 OZ |
1250 | default: |
1251 | return 0; | |
62e64905 | 1252 | } |
95616c82 OZ |
1253 | } |
1254 | ||
1255 | static inline int | |
4e276a89 | 1256 | nh_bufsize(struct nexthop *nh) |
95616c82 OZ |
1257 | { |
1258 | int rv = 0; | |
1259 | for (; nh != NULL; nh = nh->next) | |
9fdf9d29 | 1260 | rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr))); |
95616c82 OZ |
1261 | return rv; |
1262 | } | |
1263 | ||
1264 | static int | |
722daa95 | 1265 | nl_send_route(struct krt_proto *p, rte *e, int op) |
95616c82 OZ |
1266 | { |
1267 | eattr *ea; | |
1268 | net *net = e->net; | |
1269 | rta *a = e->attrs; | |
13c0be19 | 1270 | ea_list *eattrs = a->eattrs; |
4e276a89 | 1271 | int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(&(a->nh)); |
4adcb9df | 1272 | u32 priority = 0; |
a8caff32 | 1273 | |
95616c82 OZ |
1274 | struct { |
1275 | struct nlmsghdr h; | |
1276 | struct rtmsg r; | |
a8caff32 JMM |
1277 | char buf[0]; |
1278 | } *r; | |
1279 | ||
1280 | int rsize = sizeof(*r) + bufsize; | |
1281 | r = alloca(rsize); | |
95616c82 | 1282 | |
cc5b93f7 | 1283 | DBG("nl_send_route(%N,op=%x)\n", net->n.addr, op); |
95616c82 | 1284 | |
a8caff32 JMM |
1285 | bzero(&r->h, sizeof(r->h)); |
1286 | bzero(&r->r, sizeof(r->r)); | |
cc5b93f7 | 1287 | r->h.nlmsg_type = op ? RTM_NEWROUTE : RTM_DELROUTE; |
a8caff32 | 1288 | r->h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
cc5b93f7 | 1289 | r->h.nlmsg_flags = op | NLM_F_REQUEST | NLM_F_ACK; |
95616c82 | 1290 | |
a8caff32 JMM |
1291 | r->r.rtm_family = p->af; |
1292 | r->r.rtm_dst_len = net_pxlen(net->n.addr); | |
1293 | r->r.rtm_protocol = RTPROT_BIRD; | |
7074be22 | 1294 | r->r.rtm_scope = RT_SCOPE_NOWHERE; |
6b0f5f68 | 1295 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
1296 | if (p->af == AF_MPLS) |
1297 | { | |
66acbc8d OZ |
1298 | /* |
1299 | * Kernel MPLS code is a bit picky. We must: | |
1300 | * 1) Always set RT_SCOPE_UNIVERSE and RTN_UNICAST (even for RTM_DELROUTE) | |
1301 | * 2) Never use RTA_PRIORITY | |
1302 | */ | |
1303 | ||
d14f8c3c JMM |
1304 | u32 label = net_mpls(net->n.addr); |
1305 | nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label); | |
66acbc8d OZ |
1306 | r->r.rtm_scope = RT_SCOPE_UNIVERSE; |
1307 | r->r.rtm_type = RTN_UNICAST; | |
d14f8c3c JMM |
1308 | } |
1309 | else | |
6b0f5f68 | 1310 | #endif |
be17805c | 1311 | { |
d14f8c3c | 1312 | nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr)); |
95616c82 | 1313 | |
be17805c OZ |
1314 | /* Add source address for IPv6 SADR routes */ |
1315 | if (net->n.addr->type == NET_IP6_SADR) | |
1316 | { | |
1317 | net_addr_ip6_sadr *a = (void *) &net->n.addr; | |
1318 | nl_add_attr_ip6(&r->h, rsize, RTA_SRC, a->src_prefix); | |
1319 | r->r.rtm_src_len = a->src_pxlen; | |
1320 | } | |
1321 | } | |
1322 | ||
2feaa693 OZ |
1323 | /* |
1324 | * Strange behavior for RTM_DELROUTE: | |
1325 | * 1) rtm_family is ignored in IPv6, works for IPv4 | |
1326 | * 2) not setting RTA_PRIORITY is different from setting default value (on IPv6) | |
1327 | * 3) not setting RTA_PRIORITY is equivalent to setting 0, which is wildcard | |
1328 | */ | |
1329 | ||
9ddbfbdd | 1330 | if (krt_table_id(p) < 256) |
a8caff32 | 1331 | r->r.rtm_table = krt_table_id(p); |
9ddbfbdd | 1332 | else |
a8caff32 | 1333 | nl_add_attr_u32(&r->h, rsize, RTA_TABLE, krt_table_id(p)); |
9ddbfbdd | 1334 | |
66acbc8d OZ |
1335 | if (p->af == AF_MPLS) |
1336 | priority = 0; | |
4adcb9df OZ |
1337 | else if (KRT_CF->sys.metric) |
1338 | priority = KRT_CF->sys.metric; | |
1339 | else if ((op != NL_OP_DELETE) && (ea = ea_find(eattrs, EA_KRT_METRIC))) | |
1340 | priority = ea->u.data; | |
78a2cc28 | 1341 | |
4adcb9df | 1342 | if (priority) |
d1b8fe93 | 1343 | nl_add_attr_u32(&r->h, rsize, RTA_PRIORITY, priority); |
78a2cc28 | 1344 | |
2feaa693 OZ |
1345 | /* For route delete, we do not specify remaining route attributes */ |
1346 | if (op == NL_OP_DELETE) | |
722daa95 | 1347 | goto done; |
78a2cc28 | 1348 | |
6e75d0d2 | 1349 | /* Default scope is LINK for device routes, UNIVERSE otherwise */ |
66acbc8d OZ |
1350 | if (p->af == AF_MPLS) |
1351 | r->r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1352 | else if (ea = ea_find(eattrs, EA_KRT_SCOPE)) | |
cc5b93f7 | 1353 | r->r.rtm_scope = ea->u.data; |
722daa95 OZ |
1354 | else if (a->dest == RTD_UNICAST && ipa_zero(a->nh.gw)) |
1355 | r->r.rtm_scope = RT_SCOPE_LINK; | |
6e75d0d2 | 1356 | else |
722daa95 | 1357 | r->r.rtm_scope = RT_SCOPE_UNIVERSE; |
95616c82 OZ |
1358 | |
1359 | if (ea = ea_find(eattrs, EA_KRT_PREFSRC)) | |
a8caff32 | 1360 | nl_add_attr_ipa(&r->h, rsize, RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); |
95616c82 OZ |
1361 | |
1362 | if (ea = ea_find(eattrs, EA_KRT_REALM)) | |
a8caff32 | 1363 | nl_add_attr_u32(&r->h, rsize, RTA_FLOW, ea->u.data); |
95616c82 | 1364 | |
9fdf9d29 OZ |
1365 | |
1366 | u32 metrics[KRT_METRICS_MAX]; | |
1367 | metrics[0] = 0; | |
1368 | ||
1369 | struct ea_walk_state ews = { .eattrs = eattrs }; | |
1370 | while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX)) | |
1371 | { | |
1372 | int id = ea->id - EA_KRT_METRICS; | |
1373 | metrics[0] |= 1 << id; | |
1374 | metrics[id] = ea->u.data; | |
1375 | } | |
1376 | ||
1377 | if (metrics[0]) | |
a8caff32 | 1378 | nl_add_metrics(&r->h, rsize, metrics, KRT_METRICS_MAX); |
9fdf9d29 | 1379 | |
722daa95 | 1380 | switch (a->dest) |
95616c82 | 1381 | { |
4e276a89 | 1382 | case RTD_UNICAST: |
a8caff32 | 1383 | r->r.rtm_type = RTN_UNICAST; |
722daa95 OZ |
1384 | struct nexthop *nh = &(a->nh); |
1385 | if (nh->next) | |
21f9acd2 | 1386 | nl_add_multipath(&r->h, rsize, nh, p->af, eattrs); |
4e276a89 JMM |
1387 | else |
1388 | { | |
1389 | nl_add_attr_u32(&r->h, rsize, RTA_OIF, nh->iface->index); | |
d14f8c3c | 1390 | nl_add_nexthop(&r->h, rsize, nh, p->af); |
a1f5e514 OZ |
1391 | |
1392 | if (nh->flags & RNF_ONLINK) | |
1393 | r->r.rtm_flags |= RTNH_F_ONLINK; | |
4e276a89 | 1394 | } |
95616c82 OZ |
1395 | break; |
1396 | case RTD_BLACKHOLE: | |
a8caff32 | 1397 | r->r.rtm_type = RTN_BLACKHOLE; |
95616c82 OZ |
1398 | break; |
1399 | case RTD_UNREACHABLE: | |
a8caff32 | 1400 | r->r.rtm_type = RTN_UNREACHABLE; |
95616c82 OZ |
1401 | break; |
1402 | case RTD_PROHIBIT: | |
a8caff32 | 1403 | r->r.rtm_type = RTN_PROHIBIT; |
95616c82 | 1404 | break; |
2feaa693 OZ |
1405 | case RTD_NONE: |
1406 | break; | |
95616c82 OZ |
1407 | default: |
1408 | bug("krt_capable inconsistent with nl_send_route"); | |
1409 | } | |
1410 | ||
722daa95 | 1411 | done: |
2feaa693 | 1412 | /* Ignore missing for DELETE */ |
cc5b93f7 | 1413 | return nl_exchange(&r->h, (op == NL_OP_DELETE)); |
2feaa693 OZ |
1414 | } |
1415 | ||
1416 | static inline int | |
ddb1bdf2 | 1417 | nl_allow_replace(struct krt_proto *p, rte *new) |
2feaa693 | 1418 | { |
ddb1bdf2 OZ |
1419 | /* |
1420 | * We use NL_OP_REPLACE for IPv4, it has an issue with not checking for | |
1421 | * matching rtm_protocol, but that is OK when dedicated priority is used. | |
1422 | * | |
1423 | * For IPv6, the NL_OP_REPLACE is still broken even in Linux 4.19 LTS | |
1424 | * (although it seems to be fixed in Linux 5.10 LTS) for sequence: | |
1425 | * | |
1426 | * ip route add 2001:db8::/32 via fe80::1 dev eth0 | |
1427 | * ip route replace 2001:db8::/32 dev eth0 | |
1428 | * | |
1429 | * (it ends with two routes instead of replacing the first by the second one) | |
1430 | * | |
1431 | * Replacing with direct and special type (e.g. unreachable) routes does not | |
1432 | * work, but replacing with regular routes work reliably | |
1433 | */ | |
2feaa693 | 1434 | |
ddb1bdf2 OZ |
1435 | if (krt_ipv4(p)) |
1436 | return 1; | |
95616c82 | 1437 | |
ddb1bdf2 OZ |
1438 | rta *a = new->attrs; |
1439 | return (a->dest == RTD_UNICAST) && ipa_nonzero(a->nh.gw); | |
8235c474 OZ |
1440 | } |
1441 | ||
95616c82 | 1442 | void |
cc75b3e1 | 1443 | krt_replace_rte(struct krt_proto *p, net *n UNUSED, rte *new, rte *old) |
95616c82 OZ |
1444 | { |
1445 | int err = 0; | |
1446 | ||
ddb1bdf2 | 1447 | if (old && new && nl_allow_replace(p, new)) |
8235c474 | 1448 | { |
722daa95 | 1449 | err = nl_send_route(p, new, NL_OP_REPLACE); |
8235c474 OZ |
1450 | } |
1451 | else | |
1452 | { | |
1453 | if (old) | |
722daa95 | 1454 | nl_send_route(p, old, NL_OP_DELETE); |
95616c82 | 1455 | |
8235c474 | 1456 | if (new) |
722daa95 | 1457 | err = nl_send_route(p, new, NL_OP_ADD); |
8235c474 | 1458 | } |
95616c82 | 1459 | |
cc75b3e1 OZ |
1460 | if (new) |
1461 | { | |
1462 | if (err < 0) | |
1463 | bmap_clear(&p->sync_map, new->id); | |
1464 | else | |
1465 | bmap_set(&p->sync_map, new->id); | |
1466 | } | |
95616c82 OZ |
1467 | } |
1468 | ||
2feaa693 | 1469 | |
d0dd1d20 OZ |
1470 | #define SKIP0(ARG, ...) do { DBG("KRT: Ignoring route - " ARG, ##__VA_ARGS__); return; } while(0) |
1471 | #define SKIP(ARG, ...) do { DBG("KRT: Ignoring route %N - " ARG, &dst, ##__VA_ARGS__); return; } while(0) | |
95616c82 OZ |
1472 | |
1473 | static void | |
2feaa693 | 1474 | nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) |
95616c82 OZ |
1475 | { |
1476 | struct krt_proto *p; | |
1477 | struct rtmsg *i; | |
ad276157 | 1478 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
1479 | int new = h->nlmsg_type == RTM_NEWROUTE; |
1480 | ||
be17805c | 1481 | net_addr dst, src = {}; |
95616c82 | 1482 | u32 oif = ~0; |
29a64162 | 1483 | u32 table_id; |
2feaa693 | 1484 | u32 priority = 0; |
6e75d0d2 | 1485 | u32 def_scope = RT_SCOPE_UNIVERSE; |
be17805c | 1486 | int krt_src; |
95616c82 | 1487 | |
ad276157 | 1488 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 1489 | return; |
ad276157 JMM |
1490 | |
1491 | switch (i->rtm_family) | |
95616c82 | 1492 | { |
29a64162 OZ |
1493 | case AF_INET: |
1494 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a))) | |
1495 | return; | |
1496 | ||
1497 | if (a[RTA_DST]) | |
1498 | net_fill_ip4(&dst, rta_get_ip4(a[RTA_DST]), i->rtm_dst_len); | |
1499 | else | |
1500 | net_fill_ip4(&dst, IP4_NONE, 0); | |
1501 | break; | |
1502 | ||
cc5b93f7 OZ |
1503 | case AF_INET6: |
1504 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a))) | |
1505 | return; | |
29a64162 OZ |
1506 | |
1507 | if (a[RTA_DST]) | |
1508 | net_fill_ip6(&dst, rta_get_ip6(a[RTA_DST]), i->rtm_dst_len); | |
1509 | else | |
1510 | net_fill_ip6(&dst, IP6_NONE, 0); | |
be17805c OZ |
1511 | |
1512 | if (a[RTA_SRC]) | |
1513 | net_fill_ip6(&src, rta_get_ip6(a[RTA_SRC]), i->rtm_src_len); | |
1514 | else | |
1515 | net_fill_ip6(&src, IP6_NONE, 0); | |
29a64162 OZ |
1516 | break; |
1517 | ||
6b0f5f68 | 1518 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
1519 | case AF_MPLS: |
1520 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want_mpls, a, sizeof(a))) | |
1521 | return; | |
1522 | ||
ed610044 | 1523 | if (!a[RTA_DST]) |
d0dd1d20 | 1524 | SKIP0("MPLS route without RTA_DST\n"); |
ed610044 OZ |
1525 | |
1526 | if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1) | |
d0dd1d20 | 1527 | SKIP0("MPLS route with multi-label RTA_DST\n"); |
ed610044 OZ |
1528 | |
1529 | net_fill_mpls(&dst, rta_mpls_stack[0]); | |
d14f8c3c | 1530 | break; |
6b0f5f68 | 1531 | #endif |
d14f8c3c | 1532 | |
29a64162 OZ |
1533 | default: |
1534 | return; | |
95616c82 OZ |
1535 | } |
1536 | ||
95616c82 | 1537 | if (a[RTA_OIF]) |
acb04cfd | 1538 | oif = rta_get_u32(a[RTA_OIF]); |
95616c82 | 1539 | |
9ddbfbdd | 1540 | if (a[RTA_TABLE]) |
29a64162 | 1541 | table_id = rta_get_u32(a[RTA_TABLE]); |
9ddbfbdd | 1542 | else |
29a64162 | 1543 | table_id = i->rtm_table; |
9ddbfbdd | 1544 | |
d0dd1d20 OZ |
1545 | if (i->rtm_flags & RTM_F_CLONED) |
1546 | SKIP("cloned\n"); | |
1547 | ||
29a64162 OZ |
1548 | /* Do we know this table? */ |
1549 | p = HASH_FIND(nl_table_map, RTH, i->rtm_family, table_id); | |
95616c82 | 1550 | if (!p) |
4659b2ae | 1551 | SKIP("unknown table %u\n", table_id); |
95616c82 | 1552 | |
be17805c OZ |
1553 | if (a[RTA_SRC] && (p->p.net_type != NET_IP6_SADR)) |
1554 | SKIP("src prefix for non-SADR channel\n"); | |
1555 | ||
95616c82 OZ |
1556 | if (a[RTA_IIF]) |
1557 | SKIP("IIF set\n"); | |
29a64162 | 1558 | |
95616c82 OZ |
1559 | if (i->rtm_tos != 0) /* We don't support TOS */ |
1560 | SKIP("TOS %02x\n", i->rtm_tos); | |
95616c82 | 1561 | |
2feaa693 | 1562 | if (s->scan && !new) |
95616c82 OZ |
1563 | SKIP("RTM_DELROUTE in scan\n"); |
1564 | ||
2feaa693 OZ |
1565 | if (a[RTA_PRIORITY]) |
1566 | priority = rta_get_u32(a[RTA_PRIORITY]); | |
1567 | ||
9b136840 | 1568 | int c = net_classify(&dst); |
95616c82 OZ |
1569 | if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) |
1570 | SKIP("strange class/scope\n"); | |
1571 | ||
95616c82 OZ |
1572 | switch (i->rtm_protocol) |
1573 | { | |
1574 | case RTPROT_UNSPEC: | |
1575 | SKIP("proto unspec\n"); | |
1576 | ||
1577 | case RTPROT_REDIRECT: | |
be17805c | 1578 | krt_src = KRT_SRC_REDIRECT; |
95616c82 OZ |
1579 | break; |
1580 | ||
1581 | case RTPROT_KERNEL: | |
be17805c | 1582 | krt_src = KRT_SRC_KERNEL; |
95616c82 OZ |
1583 | return; |
1584 | ||
1585 | case RTPROT_BIRD: | |
2feaa693 | 1586 | if (!s->scan) |
95616c82 | 1587 | SKIP("echo\n"); |
be17805c | 1588 | krt_src = KRT_SRC_BIRD; |
95616c82 OZ |
1589 | break; |
1590 | ||
1591 | case RTPROT_BOOT: | |
1592 | default: | |
be17805c | 1593 | krt_src = KRT_SRC_ALIEN; |
95616c82 OZ |
1594 | } |
1595 | ||
be17805c OZ |
1596 | net_addr *n = &dst; |
1597 | if (p->p.net_type == NET_IP6_SADR) | |
1598 | { | |
1599 | n = alloca(sizeof(net_addr_ip6_sadr)); | |
1600 | net_fill_ip6_sadr(n, net6_prefix(&dst), net6_pxlen(&dst), | |
1601 | net6_prefix(&src), net6_pxlen(&src)); | |
1602 | } | |
1603 | ||
1604 | net *net = net_get(p->p.main_channel->table, n); | |
95616c82 | 1605 | |
d14f8c3c | 1606 | rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE); |
2feaa693 OZ |
1607 | ra->source = RTS_INHERIT; |
1608 | ra->scope = SCOPE_UNIVERSE; | |
95616c82 | 1609 | |
082905a8 OZ |
1610 | { |
1611 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + 2 * sizeof(eattr)); | |
1612 | *ea = (ea_list) { .flags = EALF_SORTED, .count = 2 }; | |
1613 | ea->next = ra->eattrs; | |
1614 | ra->eattrs = ea; | |
1615 | ||
1616 | ea->attrs[0] = (eattr) { | |
1617 | .id = EA_KRT_SOURCE, | |
1618 | .type = EAF_TYPE_INT, | |
1619 | .u.data = i->rtm_protocol | |
1620 | }; | |
1621 | ||
1622 | ea->attrs[1] = (eattr) { | |
1623 | .id = EA_KRT_METRIC, | |
1624 | .type = EAF_TYPE_INT, | |
1625 | .u.data = priority, | |
1626 | }; | |
1627 | } | |
1628 | ||
21f9acd2 OZ |
1629 | if (a[RTA_FLOW]) |
1630 | s->rta_flow = rta_get_u32(a[RTA_FLOW]); | |
1631 | else | |
1632 | s->rta_flow = 0; | |
1633 | ||
95616c82 OZ |
1634 | switch (i->rtm_type) |
1635 | { | |
1636 | case RTN_UNICAST: | |
62e64905 | 1637 | ra->dest = RTD_UNICAST; |
95616c82 | 1638 | |
98bb80a2 | 1639 | if (a[RTA_MULTIPATH]) |
4ff15a75 | 1640 | { |
f5c8fb5f | 1641 | struct nexthop *nh = nl_parse_multipath(s, p, n, a[RTA_MULTIPATH], i->rtm_family, krt_src); |
4e276a89 | 1642 | if (!nh) |
77d032c7 | 1643 | SKIP("strange RTA_MULTIPATH\n"); |
9fdf9d29 | 1644 | |
2eaf65ec | 1645 | nexthop_link(ra, nh); |
95616c82 OZ |
1646 | break; |
1647 | } | |
1648 | ||
f5c8fb5f | 1649 | if ((i->rtm_flags & RTNH_F_DEAD) && (krt_src != KRT_SRC_BIRD)) |
77d032c7 | 1650 | SKIP("ignore RTNH_F_DEAD\n"); |
df83f626 | 1651 | |
4e276a89 JMM |
1652 | ra->nh.iface = if_find_by_index(oif); |
1653 | if (!ra->nh.iface) | |
95616c82 | 1654 | { |
fe9f1a6d | 1655 | log(L_ERR "KRT: Received route %N with unknown ifindex %u", net->n.addr, oif); |
95616c82 OZ |
1656 | return; |
1657 | } | |
1658 | ||
53401bef OZ |
1659 | if (a[RTA_GATEWAY]) |
1660 | ra->nh.gw = rta_get_ipa(a[RTA_GATEWAY]); | |
1661 | ||
6b0f5f68 | 1662 | #ifdef HAVE_MPLS_KERNEL |
53401bef OZ |
1663 | if (a[RTA_VIA]) |
1664 | ra->nh.gw = rta_get_via(a[RTA_VIA]); | |
6b0f5f68 | 1665 | #endif |
95616c82 | 1666 | |
32425297 OZ |
1667 | if (i->rtm_flags & RTNH_F_ONLINK) |
1668 | ra->nh.flags |= RNF_ONLINK; | |
1669 | ||
53401bef OZ |
1670 | if (ipa_nonzero(ra->nh.gw)) |
1671 | { | |
95616c82 | 1672 | /* Silently skip strange 6to4 routes */ |
0bf95f99 | 1673 | const net_addr_ip6 sit = NET_ADDR_IP6(IP6_NONE, 96); |
4e276a89 | 1674 | if ((i->rtm_family == AF_INET6) && ipa_in_netX(ra->nh.gw, (net_addr *) &sit)) |
95616c82 OZ |
1675 | return; |
1676 | ||
23c212e7 | 1677 | neighbor *nbr; |
586c1800 OZ |
1678 | nbr = neigh_find(&p->p, ra->nh.gw, ra->nh.iface, |
1679 | (ra->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0); | |
23c212e7 | 1680 | if (!nbr || (nbr->scope == SCOPE_HOST)) |
95616c82 | 1681 | { |
4e276a89 JMM |
1682 | log(L_ERR "KRT: Received route %N with strange next-hop %I", net->n.addr, |
1683 | ra->nh.gw); | |
95616c82 OZ |
1684 | return; |
1685 | } | |
1686 | } | |
95616c82 OZ |
1687 | |
1688 | break; | |
1689 | case RTN_BLACKHOLE: | |
2feaa693 | 1690 | ra->dest = RTD_BLACKHOLE; |
95616c82 OZ |
1691 | break; |
1692 | case RTN_UNREACHABLE: | |
2feaa693 | 1693 | ra->dest = RTD_UNREACHABLE; |
95616c82 OZ |
1694 | break; |
1695 | case RTN_PROHIBIT: | |
2feaa693 | 1696 | ra->dest = RTD_PROHIBIT; |
95616c82 OZ |
1697 | break; |
1698 | /* FIXME: What about RTN_THROW? */ | |
1699 | default: | |
1700 | SKIP("type %d\n", i->rtm_type); | |
1701 | return; | |
1702 | } | |
1703 | ||
6b0f5f68 | 1704 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c | 1705 | if ((i->rtm_family == AF_MPLS) && a[RTA_NEWDST] && !ra->nh.next) |
2eaf65ec | 1706 | ra->nh.labels = rta_get_mpls(a[RTA_NEWDST], ra->nh.label); |
d14f8c3c JMM |
1707 | |
1708 | if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE] && !ra->nh.next) | |
1709 | { | |
1710 | switch (rta_get_u16(a[RTA_ENCAP_TYPE])) | |
1711 | { | |
1712 | case LWTUNNEL_ENCAP_MPLS: | |
1713 | { | |
1714 | struct rtattr *enca[BIRD_RTA_MAX]; | |
1715 | nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]); | |
1716 | nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca)); | |
2eaf65ec | 1717 | ra->nh.labels = rta_get_mpls(enca[RTA_DST], ra->nh.label); |
d14f8c3c JMM |
1718 | break; |
1719 | } | |
1720 | default: | |
1721 | SKIP("unknown encapsulation method %d\n", rta_get_u16(a[RTA_ENCAP_TYPE])); | |
1722 | break; | |
1723 | } | |
1724 | } | |
6b0f5f68 | 1725 | #endif |
d14f8c3c | 1726 | |
6e75d0d2 OZ |
1727 | if (i->rtm_scope != def_scope) |
1728 | { | |
1729 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); | |
1730 | ea->next = ra->eattrs; | |
1731 | ra->eattrs = ea; | |
1732 | ea->flags = EALF_SORTED; | |
1733 | ea->count = 1; | |
16ac6c3c MM |
1734 | ea->attrs[0] = (eattr) { |
1735 | .id = EA_KRT_SCOPE, | |
1736 | .flags = 0, | |
1737 | .type = EAF_TYPE_INT, | |
1738 | .u.data = i->rtm_scope, | |
1739 | }; | |
6e75d0d2 | 1740 | } |
95616c82 OZ |
1741 | |
1742 | if (a[RTA_PREFSRC]) | |
1743 | { | |
9b136840 | 1744 | ip_addr ps = rta_get_ipa(a[RTA_PREFSRC]); |
95616c82 | 1745 | |
16ac6c3c MM |
1746 | struct adata *ad = lp_alloc(s->pool, sizeof(struct adata) + sizeof(ps)); |
1747 | ad->length = sizeof(ps); | |
1748 | memcpy(ad->data, &ps, sizeof(ps)); | |
1749 | ||
2feaa693 OZ |
1750 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); |
1751 | ea->next = ra->eattrs; | |
1752 | ra->eattrs = ea; | |
95616c82 OZ |
1753 | ea->flags = EALF_SORTED; |
1754 | ea->count = 1; | |
16ac6c3c MM |
1755 | ea->attrs[0] = (eattr) { |
1756 | .id = EA_KRT_PREFSRC, | |
1757 | .flags = 0, | |
1758 | .type = EAF_TYPE_IP_ADDRESS, | |
1759 | .u.ptr = ad, | |
1760 | }; | |
95616c82 OZ |
1761 | } |
1762 | ||
21f9acd2 OZ |
1763 | /* Can be set per-route or per-nexthop */ |
1764 | if (s->rta_flow) | |
95616c82 | 1765 | { |
2feaa693 OZ |
1766 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); |
1767 | ea->next = ra->eattrs; | |
1768 | ra->eattrs = ea; | |
95616c82 OZ |
1769 | ea->flags = EALF_SORTED; |
1770 | ea->count = 1; | |
16ac6c3c MM |
1771 | ea->attrs[0] = (eattr) { |
1772 | .id = EA_KRT_REALM, | |
1773 | .flags = 0, | |
1774 | .type = EAF_TYPE_INT, | |
1775 | .u.data = s->rta_flow, | |
1776 | }; | |
95616c82 OZ |
1777 | } |
1778 | ||
9fdf9d29 OZ |
1779 | if (a[RTA_METRICS]) |
1780 | { | |
1781 | u32 metrics[KRT_METRICS_MAX]; | |
2feaa693 | 1782 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr)); |
9fdf9d29 OZ |
1783 | int t, n = 0; |
1784 | ||
1785 | if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0) | |
1786 | { | |
fe9f1a6d | 1787 | log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net->n.addr); |
9fdf9d29 OZ |
1788 | return; |
1789 | } | |
1790 | ||
1791 | for (t = 1; t < KRT_METRICS_MAX; t++) | |
1792 | if (metrics[0] & (1 << t)) | |
16ac6c3c MM |
1793 | ea->attrs[n++] = (eattr) { |
1794 | .id = EA_CODE(PROTOCOL_KERNEL, KRT_METRICS_OFFSET + t), | |
1795 | .flags = 0, | |
1796 | .type = EAF_TYPE_INT, /* FIXME: Some are EAF_TYPE_BITFIELD */ | |
1797 | .u.data = metrics[t], | |
1798 | }; | |
9fdf9d29 OZ |
1799 | |
1800 | if (n > 0) | |
1801 | { | |
2feaa693 | 1802 | ea->next = ra->eattrs; |
9fdf9d29 OZ |
1803 | ea->flags = EALF_SORTED; |
1804 | ea->count = n; | |
2feaa693 | 1805 | ra->eattrs = ea; |
9fdf9d29 OZ |
1806 | } |
1807 | } | |
1808 | ||
082905a8 | 1809 | rte *e = rte_get_temp(ra, p->p.main_source); |
722daa95 | 1810 | e->net = net; |
2feaa693 | 1811 | |
722daa95 | 1812 | if (s->scan) |
082905a8 | 1813 | krt_got_route(p, e, krt_src); |
95616c82 | 1814 | else |
082905a8 | 1815 | krt_got_route_async(p, e, new, krt_src); |
2feaa693 | 1816 | |
722daa95 | 1817 | lp_flush(s->pool); |
95616c82 OZ |
1818 | } |
1819 | ||
1820 | void | |
534d0a4b | 1821 | krt_do_scan(struct krt_proto *p) |
95616c82 | 1822 | { |
722daa95 OZ |
1823 | struct nl_parse_state s = { |
1824 | .proto = p, | |
1825 | .pool = nl_linpool, | |
1826 | .scan = 1, | |
1827 | }; | |
534d0a4b OZ |
1828 | |
1829 | /* Table-specific scan or shared scan */ | |
1830 | if (p) | |
1831 | nl_request_dump_route(p->af, krt_table_id(p)); | |
1832 | else | |
1833 | nl_request_dump_route(AF_UNSPEC, 0); | |
95616c82 | 1834 | |
722daa95 | 1835 | struct nlmsghdr *h; |
95616c82 | 1836 | while (h = nl_get_scan()) |
534d0a4b | 1837 | { |
95616c82 | 1838 | if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE) |
2feaa693 | 1839 | nl_parse_route(&s, h); |
95616c82 OZ |
1840 | else |
1841 | log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type); | |
534d0a4b | 1842 | } |
95616c82 OZ |
1843 | } |
1844 | ||
1845 | /* | |
1846 | * Asynchronous Netlink interface | |
1847 | */ | |
1848 | ||
1849 | static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */ | |
1850 | static byte *nl_async_rx_buffer; /* Receive buffer */ | |
81ee6cda OZ |
1851 | static uint nl_async_bufsize; /* Kernel rx buffer size for the netlink socket */ |
1852 | static struct config *nl_last_config; /* For tracking changes to nl_async_bufsize */ | |
95616c82 OZ |
1853 | |
1854 | static void | |
1855 | nl_async_msg(struct nlmsghdr *h) | |
1856 | { | |
722daa95 OZ |
1857 | struct nl_parse_state s = { |
1858 | .proto = NULL, | |
1859 | .pool = nl_linpool, | |
1860 | .scan = 0, | |
1861 | }; | |
2feaa693 | 1862 | |
95616c82 OZ |
1863 | switch (h->nlmsg_type) |
1864 | { | |
1865 | case RTM_NEWROUTE: | |
1866 | case RTM_DELROUTE: | |
1867 | DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type); | |
2feaa693 | 1868 | nl_parse_route(&s, h); |
95616c82 OZ |
1869 | break; |
1870 | case RTM_NEWLINK: | |
1871 | case RTM_DELLINK: | |
1872 | DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1873 | if (kif_proto) |
1874 | nl_parse_link(h, 0); | |
95616c82 OZ |
1875 | break; |
1876 | case RTM_NEWADDR: | |
1877 | case RTM_DELADDR: | |
1878 | DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1879 | if (kif_proto) |
1880 | nl_parse_addr(h, 0); | |
95616c82 OZ |
1881 | break; |
1882 | default: | |
1883 | DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type); | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | static int | |
3e236955 | 1888 | nl_async_hook(sock *sk, uint size UNUSED) |
95616c82 OZ |
1889 | { |
1890 | struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE }; | |
1891 | struct sockaddr_nl sa; | |
31e9e101 ST |
1892 | struct msghdr m = { |
1893 | .msg_name = &sa, | |
1894 | .msg_namelen = sizeof(sa), | |
1895 | .msg_iov = &iov, | |
1896 | .msg_iovlen = 1, | |
1897 | }; | |
95616c82 OZ |
1898 | struct nlmsghdr *h; |
1899 | int x; | |
ae80a2de | 1900 | uint len; |
95616c82 OZ |
1901 | |
1902 | x = recvmsg(sk->fd, &m, 0); | |
1903 | if (x < 0) | |
1904 | { | |
1905 | if (errno == ENOBUFS) | |
1906 | { | |
1907 | /* | |
1908 | * Netlink reports some packets have been thrown away. | |
1909 | * One day we might react to it by asking for route table | |
1910 | * scan in near future. | |
1911 | */ | |
2c33da50 | 1912 | log(L_WARN "Kernel dropped some netlink messages, will resync on next scan."); |
95616c82 OZ |
1913 | return 1; /* More data are likely to be ready */ |
1914 | } | |
1915 | else if (errno != EWOULDBLOCK) | |
1916 | log(L_ERR "Netlink recvmsg: %m"); | |
1917 | return 0; | |
1918 | } | |
1919 | if (sa.nl_pid) /* It isn't from the kernel */ | |
1920 | { | |
1921 | DBG("Non-kernel packet\n"); | |
1922 | return 1; | |
1923 | } | |
1924 | h = (void *) nl_async_rx_buffer; | |
1925 | len = x; | |
1926 | if (m.msg_flags & MSG_TRUNC) | |
1927 | { | |
1928 | log(L_WARN "Netlink got truncated asynchronous message"); | |
1929 | return 1; | |
1930 | } | |
1931 | while (NLMSG_OK(h, len)) | |
1932 | { | |
1933 | nl_async_msg(h); | |
1934 | h = NLMSG_NEXT(h, len); | |
1935 | } | |
1936 | if (len) | |
1937 | log(L_WARN "nl_async_hook: Found packet remnant of size %d", len); | |
1938 | return 1; | |
1939 | } | |
1940 | ||
ccd2a3ed JMM |
1941 | static void |
1942 | nl_async_err_hook(sock *sk, int e UNUSED) | |
1943 | { | |
1944 | nl_async_hook(sk, 0); | |
1945 | } | |
1946 | ||
95616c82 OZ |
1947 | static void |
1948 | nl_open_async(void) | |
1949 | { | |
1950 | sock *sk; | |
1951 | struct sockaddr_nl sa; | |
1952 | int fd; | |
95616c82 | 1953 | |
f83ce94d | 1954 | if (nl_async_sk) |
95616c82 | 1955 | return; |
95616c82 OZ |
1956 | |
1957 | DBG("KRT: Opening async netlink socket\n"); | |
1958 | ||
1959 | fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
1960 | if (fd < 0) | |
1961 | { | |
1962 | log(L_ERR "Unable to open asynchronous rtnetlink socket: %m"); | |
1963 | return; | |
1964 | } | |
1965 | ||
1966 | bzero(&sa, sizeof(sa)); | |
1967 | sa.nl_family = AF_NETLINK; | |
29a64162 OZ |
1968 | sa.nl_groups = RTMGRP_LINK | |
1969 | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE | | |
1970 | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE; | |
1971 | ||
95616c82 OZ |
1972 | if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) |
1973 | { | |
1974 | log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m"); | |
f83ce94d | 1975 | close(fd); |
95616c82 OZ |
1976 | return; |
1977 | } | |
1978 | ||
f83ce94d OZ |
1979 | nl_async_rx_buffer = xmalloc(NL_RX_SIZE); |
1980 | ||
95616c82 OZ |
1981 | sk = nl_async_sk = sk_new(krt_pool); |
1982 | sk->type = SK_MAGIC; | |
1983 | sk->rx_hook = nl_async_hook; | |
ccd2a3ed | 1984 | sk->err_hook = nl_async_err_hook; |
95616c82 | 1985 | sk->fd = fd; |
05476c4d | 1986 | if (sk_open(sk) < 0) |
95616c82 | 1987 | bug("Netlink: sk_open failed"); |
95616c82 OZ |
1988 | } |
1989 | ||
81ee6cda OZ |
1990 | static void |
1991 | nl_update_async_bufsize(void) | |
1992 | { | |
1993 | /* No async socket */ | |
1994 | if (!nl_async_sk) | |
1995 | return; | |
1996 | ||
1997 | /* Already reconfigured */ | |
1998 | if (nl_last_config == config) | |
1999 | return; | |
2000 | ||
2001 | /* Update netlink buffer size */ | |
2002 | uint bufsize = nl_cfg_rx_buffer_size(config); | |
2003 | if (bufsize && (bufsize != nl_async_bufsize)) | |
2004 | { | |
2005 | /* Log message for reconfigurations only */ | |
2006 | if (nl_last_config) | |
2007 | log(L_INFO "KRT: Changing netlink rx buffer size to %u", bufsize); | |
2008 | ||
2009 | nl_set_rcvbuf(nl_async_sk->fd, bufsize); | |
2010 | nl_async_bufsize = bufsize; | |
2011 | } | |
2012 | ||
2013 | nl_last_config = config; | |
2014 | } | |
2015 | ||
9ddbfbdd | 2016 | |
95616c82 OZ |
2017 | /* |
2018 | * Interface to the UNIX krt module | |
2019 | */ | |
2020 | ||
95616c82 | 2021 | void |
9ddbfbdd JMM |
2022 | krt_sys_io_init(void) |
2023 | { | |
05d47bd5 | 2024 | nl_linpool = lp_new_default(krt_pool); |
9ddbfbdd JMM |
2025 | HASH_INIT(nl_table_map, krt_pool, 6); |
2026 | } | |
2027 | ||
2028 | int | |
c6964c30 | 2029 | krt_sys_start(struct krt_proto *p) |
95616c82 | 2030 | { |
29a64162 | 2031 | struct krt_proto *old = HASH_FIND(nl_table_map, RTH, p->af, krt_table_id(p)); |
9ddbfbdd JMM |
2032 | |
2033 | if (old) | |
2034 | { | |
2035 | log(L_ERR "%s: Kernel table %u already registered by %s", | |
2036 | p->p.name, krt_table_id(p), old->p.name); | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | HASH_INSERT2(nl_table_map, RTH, krt_pool, p); | |
c6964c30 OZ |
2041 | |
2042 | nl_open(); | |
2043 | nl_open_async(); | |
81ee6cda | 2044 | nl_update_async_bufsize(); |
9ddbfbdd JMM |
2045 | |
2046 | return 1; | |
95616c82 OZ |
2047 | } |
2048 | ||
2049 | void | |
9ddbfbdd | 2050 | krt_sys_shutdown(struct krt_proto *p) |
95616c82 | 2051 | { |
81ee6cda OZ |
2052 | nl_update_async_bufsize(); |
2053 | ||
9ddbfbdd | 2054 | HASH_REMOVE2(nl_table_map, RTH, krt_pool, p); |
95616c82 OZ |
2055 | } |
2056 | ||
2057 | int | |
2058 | krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o) | |
2059 | { | |
81ee6cda OZ |
2060 | nl_update_async_bufsize(); |
2061 | ||
4adcb9df | 2062 | return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric); |
95616c82 OZ |
2063 | } |
2064 | ||
95616c82 OZ |
2065 | void |
2066 | krt_sys_init_config(struct krt_config *cf) | |
2067 | { | |
2068 | cf->sys.table_id = RT_TABLE_MAIN; | |
bff21441 | 2069 | cf->sys.metric = 32; |
95616c82 OZ |
2070 | } |
2071 | ||
2072 | void | |
2073 | krt_sys_copy_config(struct krt_config *d, struct krt_config *s) | |
2074 | { | |
2075 | d->sys.table_id = s->sys.table_id; | |
4adcb9df | 2076 | d->sys.metric = s->sys.metric; |
95616c82 OZ |
2077 | } |
2078 | ||
9fdf9d29 OZ |
2079 | static const char *krt_metrics_names[KRT_METRICS_MAX] = { |
2080 | NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss", | |
2081 | "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack" | |
2082 | }; | |
2083 | ||
2084 | static const char *krt_features_names[KRT_FEATURES_MAX] = { | |
2085 | "ecn", NULL, NULL, "allfrag" | |
2086 | }; | |
2087 | ||
2088 | int | |
258be565 | 2089 | krt_sys_get_attr(const eattr *a, byte *buf, int buflen UNUSED) |
9fdf9d29 OZ |
2090 | { |
2091 | switch (a->id) | |
2092 | { | |
2093 | case EA_KRT_PREFSRC: | |
2094 | bsprintf(buf, "prefsrc"); | |
2095 | return GA_NAME; | |
2096 | ||
2097 | case EA_KRT_REALM: | |
2098 | bsprintf(buf, "realm"); | |
2099 | return GA_NAME; | |
2100 | ||
6e75d0d2 OZ |
2101 | case EA_KRT_SCOPE: |
2102 | bsprintf(buf, "scope"); | |
2103 | return GA_NAME; | |
2104 | ||
9fdf9d29 OZ |
2105 | case EA_KRT_LOCK: |
2106 | buf += bsprintf(buf, "lock:"); | |
2107 | ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX); | |
2108 | return GA_FULL; | |
2109 | ||
2110 | case EA_KRT_FEATURES: | |
2111 | buf += bsprintf(buf, "features:"); | |
2112 | ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX); | |
2113 | return GA_FULL; | |
2114 | ||
2115 | default:; | |
2116 | int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET; | |
2117 | if (id > 0 && id < KRT_METRICS_MAX) | |
2118 | { | |
2119 | bsprintf(buf, "%s", krt_metrics_names[id]); | |
2120 | return GA_NAME; | |
2121 | } | |
2122 | ||
2123 | return GA_UNKNOWN; | |
2124 | } | |
2125 | } | |
2126 | ||
95616c82 OZ |
2127 | |
2128 | ||
2129 | void | |
2130 | kif_sys_start(struct kif_proto *p UNUSED) | |
2131 | { | |
2132 | nl_open(); | |
2133 | nl_open_async(); | |
2134 | } | |
2135 | ||
2136 | void | |
2137 | kif_sys_shutdown(struct kif_proto *p UNUSED) | |
2138 | { | |
2139 | } | |
153f02da OZ |
2140 | |
2141 | int | |
2142 | kif_update_sysdep_addr(struct iface *i UNUSED) | |
2143 | { | |
2144 | return 0; | |
2145 | } |