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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 | ||
a8caff32 | 9 | #include <alloca.h> |
95616c82 | 10 | #include <stdio.h> |
f83ce94d | 11 | #include <unistd.h> |
95616c82 OZ |
12 | #include <fcntl.h> |
13 | #include <sys/socket.h> | |
14 | #include <sys/uio.h> | |
15 | #include <errno.h> | |
16 | ||
17 | #undef LOCAL_DEBUG | |
18 | ||
19 | #include "nest/bird.h" | |
20 | #include "nest/route.h" | |
21 | #include "nest/protocol.h" | |
22 | #include "nest/iface.h" | |
4e276a89 | 23 | #include "lib/alloca.h" |
7152e5ef JMM |
24 | #include "sysdep/unix/unix.h" |
25 | #include "sysdep/unix/krt.h" | |
95616c82 OZ |
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 | ||
6b0f5f68 MJM |
36 | #ifdef HAVE_MPLS_KERNEL |
37 | #include <linux/lwtunnel.h> | |
38 | #endif | |
9ddbfbdd | 39 | |
95616c82 OZ |
40 | #ifndef MSG_TRUNC /* Hack: Several versions of glibc miss this one :( */ |
41 | #define MSG_TRUNC 0x20 | |
42 | #endif | |
43 | ||
a08a81c6 OZ |
44 | #ifndef IFA_FLAGS |
45 | #define IFA_FLAGS 8 | |
46 | #endif | |
47 | ||
95616c82 OZ |
48 | #ifndef IFF_LOWER_UP |
49 | #define IFF_LOWER_UP 0x10000 | |
50 | #endif | |
51 | ||
9ddbfbdd JMM |
52 | #ifndef RTA_TABLE |
53 | #define RTA_TABLE 15 | |
54 | #endif | |
55 | ||
d14f8c3c JMM |
56 | #ifndef RTA_VIA |
57 | #define RTA_VIA 18 | |
58 | #endif | |
59 | ||
60 | #ifndef RTA_NEWDST | |
61 | #define RTA_NEWDST 19 | |
62 | #endif | |
63 | ||
64 | #ifndef RTA_ENCAP_TYPE | |
65 | #define RTA_ENCAP_TYPE 21 | |
66 | #endif | |
67 | ||
68 | #ifndef RTA_ENCAP | |
69 | #define RTA_ENCAP 22 | |
70 | #endif | |
9ddbfbdd | 71 | |
8235c474 | 72 | #define krt_ipv4(p) ((p)->af == AF_INET) |
cc5b93f7 | 73 | #define krt_ecmp6(p) ((p)->af == AF_INET6) |
2feaa693 | 74 | |
517d05df OZ |
75 | const int rt_default_ecmp = 16; |
76 | ||
2feaa693 OZ |
77 | /* |
78 | * Structure nl_parse_state keeps state of received route processing. Ideally, | |
79 | * we could just independently parse received Netlink messages and immediately | |
98bb80a2 OZ |
80 | * propagate received routes to the rest of BIRD, but older Linux kernel (before |
81 | * version 4.11) represents and announces IPv6 ECMP routes not as one route with | |
82 | * multiple next hops (like RTA_MULTIPATH in IPv4 ECMP), but as a sequence of | |
83 | * routes with the same prefix. More recent kernels work as with IPv4. | |
2feaa693 OZ |
84 | * |
85 | * Therefore, BIRD keeps currently processed route in nl_parse_state structure | |
86 | * and postpones its propagation until we expect it to be final; i.e., when | |
87 | * non-matching route is received or when the scan ends. When another matching | |
88 | * route is received, it is merged with the already processed route to form an | |
89 | * ECMP route. Note that merging is done only for IPv6 (merge == 1), but the | |
98bb80a2 OZ |
90 | * postponing is done in both cases (for simplicity). All IPv4 routes or IPv6 |
91 | * routes with RTA_MULTIPATH set are just considered non-matching. | |
2feaa693 OZ |
92 | * |
93 | * This is ignored for asynchronous notifications (every notification is handled | |
94 | * as a separate route). It is not an issue for our routes, as we ignore such | |
95 | * notifications anyways. But importing alien IPv6 ECMP routes does not work | |
98bb80a2 OZ |
96 | * properly with older kernels. |
97 | * | |
98 | * Whatever the kernel version is, IPv6 ECMP routes are sent as multiple routes | |
99 | * for the same prefix. | |
2feaa693 OZ |
100 | */ |
101 | ||
102 | struct nl_parse_state | |
103 | { | |
104 | struct linpool *pool; | |
105 | int scan; | |
106 | int merge; | |
107 | ||
108 | net *net; | |
109 | rta *attrs; | |
110 | struct krt_proto *proto; | |
111 | s8 new; | |
112 | s8 krt_src; | |
113 | u8 krt_type; | |
114 | u8 krt_proto; | |
115 | u32 krt_metric; | |
116 | }; | |
117 | ||
95616c82 OZ |
118 | /* |
119 | * Synchronous Netlink interface | |
120 | */ | |
121 | ||
122 | struct nl_sock | |
123 | { | |
124 | int fd; | |
125 | u32 seq; | |
126 | byte *rx_buffer; /* Receive buffer */ | |
127 | struct nlmsghdr *last_hdr; /* Recently received packet */ | |
ae80a2de | 128 | uint last_size; |
95616c82 OZ |
129 | }; |
130 | ||
131 | #define NL_RX_SIZE 8192 | |
132 | ||
2feaa693 OZ |
133 | #define NL_OP_DELETE 0 |
134 | #define NL_OP_ADD (NLM_F_CREATE|NLM_F_EXCL) | |
135 | #define NL_OP_REPLACE (NLM_F_CREATE|NLM_F_REPLACE) | |
136 | #define NL_OP_APPEND (NLM_F_CREATE|NLM_F_APPEND) | |
137 | ||
138 | static linpool *nl_linpool; | |
139 | ||
95616c82 OZ |
140 | static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */ |
141 | static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */ | |
142 | ||
143 | static void | |
144 | nl_open_sock(struct nl_sock *nl) | |
145 | { | |
146 | if (nl->fd < 0) | |
147 | { | |
148 | nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
149 | if (nl->fd < 0) | |
150 | die("Unable to open rtnetlink socket: %m"); | |
574b2324 | 151 | nl->seq = (u32) (current_time() TO_S); /* Or perhaps random_u32() ? */ |
95616c82 OZ |
152 | nl->rx_buffer = xmalloc(NL_RX_SIZE); |
153 | nl->last_hdr = NULL; | |
154 | nl->last_size = 0; | |
155 | } | |
156 | } | |
157 | ||
158 | static void | |
159 | nl_open(void) | |
160 | { | |
161 | nl_open_sock(&nl_scan); | |
162 | nl_open_sock(&nl_req); | |
163 | } | |
164 | ||
165 | static void | |
166 | nl_send(struct nl_sock *nl, struct nlmsghdr *nh) | |
167 | { | |
168 | struct sockaddr_nl sa; | |
169 | ||
170 | memset(&sa, 0, sizeof(sa)); | |
171 | sa.nl_family = AF_NETLINK; | |
172 | nh->nlmsg_pid = 0; | |
173 | nh->nlmsg_seq = ++(nl->seq); | |
53401bef | 174 | nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len); |
95616c82 OZ |
175 | if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0) |
176 | die("rtnetlink sendto: %m"); | |
177 | nl->last_hdr = NULL; | |
178 | } | |
179 | ||
180 | static void | |
86c3eea0 | 181 | nl_request_dump(int af, int cmd) |
95616c82 OZ |
182 | { |
183 | struct { | |
184 | struct nlmsghdr nh; | |
185 | struct rtgenmsg g; | |
641172c6 OZ |
186 | } req = { |
187 | .nh.nlmsg_type = cmd, | |
188 | .nh.nlmsg_len = sizeof(req), | |
189 | .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP, | |
190 | .g.rtgen_family = af | |
191 | }; | |
95616c82 OZ |
192 | nl_send(&nl_scan, &req.nh); |
193 | } | |
194 | ||
195 | static struct nlmsghdr * | |
196 | nl_get_reply(struct nl_sock *nl) | |
197 | { | |
198 | for(;;) | |
199 | { | |
200 | if (!nl->last_hdr) | |
201 | { | |
202 | struct iovec iov = { nl->rx_buffer, NL_RX_SIZE }; | |
203 | struct sockaddr_nl sa; | |
31e9e101 ST |
204 | struct msghdr m = { |
205 | .msg_name = &sa, | |
206 | .msg_namelen = sizeof(sa), | |
207 | .msg_iov = &iov, | |
208 | .msg_iovlen = 1, | |
209 | }; | |
95616c82 OZ |
210 | int x = recvmsg(nl->fd, &m, 0); |
211 | if (x < 0) | |
212 | die("nl_get_reply: %m"); | |
213 | if (sa.nl_pid) /* It isn't from the kernel */ | |
214 | { | |
215 | DBG("Non-kernel packet\n"); | |
216 | continue; | |
217 | } | |
218 | nl->last_size = x; | |
219 | nl->last_hdr = (void *) nl->rx_buffer; | |
220 | if (m.msg_flags & MSG_TRUNC) | |
221 | bug("nl_get_reply: got truncated reply which should be impossible"); | |
222 | } | |
223 | if (NLMSG_OK(nl->last_hdr, nl->last_size)) | |
224 | { | |
225 | struct nlmsghdr *h = nl->last_hdr; | |
226 | nl->last_hdr = NLMSG_NEXT(h, nl->last_size); | |
227 | if (h->nlmsg_seq != nl->seq) | |
228 | { | |
229 | log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)", | |
230 | h->nlmsg_seq, nl->seq); | |
231 | continue; | |
232 | } | |
233 | return h; | |
234 | } | |
235 | if (nl->last_size) | |
236 | log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size); | |
237 | nl->last_hdr = NULL; | |
238 | } | |
239 | } | |
240 | ||
1123e707 | 241 | static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS; |
95616c82 OZ |
242 | |
243 | static int | |
2feaa693 | 244 | nl_error(struct nlmsghdr *h, int ignore_esrch) |
95616c82 OZ |
245 | { |
246 | struct nlmsgerr *e; | |
247 | int ec; | |
248 | ||
249 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
250 | { | |
251 | log(L_WARN "Netlink: Truncated error message received"); | |
252 | return ENOBUFS; | |
253 | } | |
254 | e = (struct nlmsgerr *) NLMSG_DATA(h); | |
255 | ec = -e->error; | |
2feaa693 | 256 | if (ec && !(ignore_esrch && (ec == ESRCH))) |
95616c82 OZ |
257 | log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec)); |
258 | return ec; | |
259 | } | |
260 | ||
261 | static struct nlmsghdr * | |
262 | nl_get_scan(void) | |
263 | { | |
264 | struct nlmsghdr *h = nl_get_reply(&nl_scan); | |
265 | ||
266 | if (h->nlmsg_type == NLMSG_DONE) | |
267 | return NULL; | |
268 | if (h->nlmsg_type == NLMSG_ERROR) | |
269 | { | |
2feaa693 | 270 | nl_error(h, 0); |
95616c82 OZ |
271 | return NULL; |
272 | } | |
273 | return h; | |
274 | } | |
275 | ||
276 | static int | |
2feaa693 | 277 | nl_exchange(struct nlmsghdr *pkt, int ignore_esrch) |
95616c82 OZ |
278 | { |
279 | struct nlmsghdr *h; | |
280 | ||
281 | nl_send(&nl_req, pkt); | |
282 | for(;;) | |
283 | { | |
284 | h = nl_get_reply(&nl_req); | |
285 | if (h->nlmsg_type == NLMSG_ERROR) | |
286 | break; | |
287 | log(L_WARN "nl_exchange: Unexpected reply received"); | |
288 | } | |
2feaa693 | 289 | return nl_error(h, ignore_esrch) ? -1 : 0; |
95616c82 OZ |
290 | } |
291 | ||
292 | /* | |
293 | * Netlink attributes | |
294 | */ | |
295 | ||
296 | static int nl_attr_len; | |
297 | ||
298 | static void * | |
299 | nl_checkin(struct nlmsghdr *h, int lsize) | |
300 | { | |
301 | nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize); | |
302 | if (nl_attr_len < 0) | |
303 | { | |
304 | log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len); | |
305 | return NULL; | |
306 | } | |
307 | return NLMSG_DATA(h); | |
308 | } | |
309 | ||
ad276157 JMM |
310 | struct nl_want_attrs { |
311 | u8 defined:1; | |
312 | u8 checksize:1; | |
313 | u8 size; | |
314 | }; | |
315 | ||
316 | ||
317 | #define BIRD_IFLA_MAX (IFLA_WIRELESS+1) | |
318 | ||
319 | static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = { | |
320 | [IFLA_IFNAME] = { 1, 0, 0 }, | |
321 | [IFLA_MTU] = { 1, 1, sizeof(u32) }, | |
943478b0 | 322 | [IFLA_MASTER] = { 1, 1, sizeof(u32) }, |
ad276157 JMM |
323 | [IFLA_WIRELESS] = { 1, 0, 0 }, |
324 | }; | |
325 | ||
29a64162 | 326 | |
e37d2e3e | 327 | #define BIRD_IFA_MAX (IFA_FLAGS+1) |
ad276157 | 328 | |
ad276157 JMM |
329 | static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = { |
330 | [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) }, | |
331 | [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) }, | |
332 | [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) }, | |
62e64905 | 333 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 | 334 | }; |
29a64162 | 335 | |
ad276157 JMM |
336 | static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = { |
337 | [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) }, | |
338 | [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) }, | |
e37d2e3e | 339 | [IFA_FLAGS] = { 1, 1, sizeof(u32) }, |
ad276157 | 340 | }; |
29a64162 | 341 | |
ad276157 | 342 | |
d14f8c3c | 343 | #define BIRD_RTA_MAX (RTA_ENCAP+1) |
ad276157 | 344 | |
4e276a89 | 345 | static struct nl_want_attrs nexthop_attr_want4[BIRD_RTA_MAX] = { |
ad276157 | 346 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, |
53401bef | 347 | [RTA_VIA] = { 1, 0, 0 }, |
d14f8c3c JMM |
348 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
349 | [RTA_ENCAP] = { 1, 0, 0 }, | |
350 | }; | |
351 | ||
4ff15a75 | 352 | static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = { |
98bb80a2 | 353 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, |
53401bef | 354 | [RTA_VIA] = { 1, 0, 0 }, |
4ff15a75 OZ |
355 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
356 | [RTA_ENCAP] = { 1, 0, 0 }, | |
357 | }; | |
358 | ||
6b0f5f68 | 359 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
360 | static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = { |
361 | [RTA_DST] = { 1, 0, 0 }, | |
ad276157 | 362 | }; |
6b0f5f68 | 363 | #endif |
ad276157 | 364 | |
ad276157 JMM |
365 | static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = { |
366 | [RTA_DST] = { 1, 1, sizeof(ip4_addr) }, | |
367 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
368 | [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) }, | |
369 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
370 | [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) }, | |
371 | [RTA_METRICS] = { 1, 0, 0 }, | |
372 | [RTA_MULTIPATH] = { 1, 0, 0 }, | |
373 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
374 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
53401bef | 375 | [RTA_VIA] = { 1, 0, 0 }, |
d14f8c3c JMM |
376 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
377 | [RTA_ENCAP] = { 1, 0, 0 }, | |
ad276157 | 378 | }; |
29a64162 | 379 | |
ad276157 JMM |
380 | static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = { |
381 | [RTA_DST] = { 1, 1, sizeof(ip6_addr) }, | |
be17805c | 382 | [RTA_SRC] = { 1, 1, sizeof(ip6_addr) }, |
ad276157 JMM |
383 | [RTA_IIF] = { 1, 1, sizeof(u32) }, |
384 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
385 | [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) }, | |
386 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
387 | [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) }, | |
388 | [RTA_METRICS] = { 1, 0, 0 }, | |
98bb80a2 | 389 | [RTA_MULTIPATH] = { 1, 0, 0 }, |
ad276157 JMM |
390 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, |
391 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
53401bef | 392 | [RTA_VIA] = { 1, 0, 0 }, |
d14f8c3c JMM |
393 | [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) }, |
394 | [RTA_ENCAP] = { 1, 0, 0 }, | |
395 | }; | |
396 | ||
6b0f5f68 | 397 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
398 | static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = { |
399 | [RTA_DST] = { 1, 1, sizeof(u32) }, | |
400 | [RTA_IIF] = { 1, 1, sizeof(u32) }, | |
401 | [RTA_OIF] = { 1, 1, sizeof(u32) }, | |
402 | [RTA_PRIORITY] = { 1, 1, sizeof(u32) }, | |
403 | [RTA_METRICS] = { 1, 0, 0 }, | |
404 | [RTA_FLOW] = { 1, 1, sizeof(u32) }, | |
405 | [RTA_TABLE] = { 1, 1, sizeof(u32) }, | |
406 | [RTA_VIA] = { 1, 0, 0 }, | |
407 | [RTA_NEWDST] = { 1, 0, 0 }, | |
ad276157 | 408 | }; |
6b0f5f68 | 409 | #endif |
ad276157 JMM |
410 | |
411 | ||
95616c82 | 412 | static int |
ad276157 | 413 | nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize) |
95616c82 OZ |
414 | { |
415 | int max = ksize / sizeof(struct rtattr *); | |
416 | bzero(k, ksize); | |
ad276157 JMM |
417 | |
418 | for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len)) | |
95616c82 | 419 | { |
ad276157 JMM |
420 | if ((a->rta_type >= max) || !want[a->rta_type].defined) |
421 | continue; | |
422 | ||
423 | if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size)) | |
424 | { | |
9b136840 | 425 | log(L_ERR "nl_parse_attrs: Malformed attribute received"); |
ad276157 JMM |
426 | return 0; |
427 | } | |
428 | ||
429 | k[a->rta_type] = a; | |
95616c82 | 430 | } |
ad276157 | 431 | |
95616c82 OZ |
432 | if (nl_attr_len) |
433 | { | |
434 | log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len); | |
435 | return 0; | |
436 | } | |
ad276157 JMM |
437 | |
438 | return 1; | |
95616c82 OZ |
439 | } |
440 | ||
d14f8c3c JMM |
441 | static inline u16 rta_get_u16(struct rtattr *a) |
442 | { return *(u16 *) RTA_DATA(a); } | |
443 | ||
fce764f9 | 444 | static inline u32 rta_get_u32(struct rtattr *a) |
acb04cfd OZ |
445 | { return *(u32 *) RTA_DATA(a); } |
446 | ||
447 | static inline ip4_addr rta_get_ip4(struct rtattr *a) | |
448 | { return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); } | |
449 | ||
450 | static inline ip6_addr rta_get_ip6(struct rtattr *a) | |
451 | { return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); } | |
452 | ||
9b136840 JMM |
453 | static inline ip_addr rta_get_ipa(struct rtattr *a) |
454 | { | |
455 | if (RTA_PAYLOAD(a) == sizeof(ip4_addr)) | |
456 | return ipa_from_ip4(rta_get_ip4(a)); | |
457 | else | |
458 | return ipa_from_ip6(rta_get_ip6(a)); | |
459 | } | |
acb04cfd | 460 | |
6b0f5f68 | 461 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
462 | static inline ip_addr rta_get_via(struct rtattr *a) |
463 | { | |
464 | struct rtvia *v = RTA_DATA(a); | |
465 | switch(v->rtvia_family) { | |
466 | case AF_INET: return ipa_from_ip4(ip4_ntoh(*(ip4_addr *) v->rtvia_addr)); | |
467 | case AF_INET6: return ipa_from_ip6(ip6_ntoh(*(ip6_addr *) v->rtvia_addr)); | |
468 | } | |
469 | return IPA_NONE; | |
470 | } | |
471 | ||
472 | static u32 rta_mpls_stack[MPLS_MAX_LABEL_STACK]; | |
473 | static inline int rta_get_mpls(struct rtattr *a, u32 *stack) | |
474 | { | |
2eaf65ec OZ |
475 | if (!a) |
476 | return 0; | |
477 | ||
d14f8c3c JMM |
478 | if (RTA_PAYLOAD(a) % 4) |
479 | log(L_WARN "KRT: Strange length of received MPLS stack: %u", RTA_PAYLOAD(a)); | |
480 | ||
2eaf65ec OZ |
481 | int labels = mpls_get(RTA_DATA(a), RTA_PAYLOAD(a) & ~0x3, stack); |
482 | ||
483 | if (labels < 0) | |
484 | { | |
485 | log(L_WARN "KRT: Too long MPLS stack received, ignoring"); | |
486 | labels = 0; | |
487 | } | |
488 | ||
489 | return labels; | |
d14f8c3c | 490 | } |
6b0f5f68 | 491 | #endif |
d14f8c3c | 492 | |
9fdf9d29 OZ |
493 | struct rtattr * |
494 | nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen) | |
95616c82 | 495 | { |
9fdf9d29 OZ |
496 | uint pos = NLMSG_ALIGN(h->nlmsg_len); |
497 | uint len = RTA_LENGTH(dlen); | |
95616c82 OZ |
498 | |
499 | if (pos + len > bufsize) | |
500 | bug("nl_add_attr: packet buffer overflow"); | |
9fdf9d29 OZ |
501 | |
502 | struct rtattr *a = (struct rtattr *)((char *)h + pos); | |
95616c82 OZ |
503 | a->rta_type = code; |
504 | a->rta_len = len; | |
505 | h->nlmsg_len = pos + len; | |
9fdf9d29 OZ |
506 | |
507 | if (dlen > 0) | |
508 | memcpy(RTA_DATA(a), data, dlen); | |
509 | ||
510 | return a; | |
95616c82 OZ |
511 | } |
512 | ||
d14f8c3c JMM |
513 | static inline struct rtattr * |
514 | nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code) | |
515 | { | |
516 | return nl_add_attr(h, bufsize, code, NULL, 0); | |
517 | } | |
518 | ||
519 | static inline void | |
520 | nl_close_attr(struct nlmsghdr *h, struct rtattr *a) | |
521 | { | |
522 | a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a; | |
523 | } | |
524 | ||
525 | static inline void | |
526 | nl_add_attr_u16(struct nlmsghdr *h, uint bufsize, int code, u16 data) | |
527 | { | |
528 | nl_add_attr(h, bufsize, code, &data, 2); | |
529 | } | |
530 | ||
95616c82 | 531 | static inline void |
29a64162 | 532 | nl_add_attr_u32(struct nlmsghdr *h, uint bufsize, int code, u32 data) |
95616c82 OZ |
533 | { |
534 | nl_add_attr(h, bufsize, code, &data, 4); | |
535 | } | |
536 | ||
537 | static inline void | |
29a64162 | 538 | nl_add_attr_ip4(struct nlmsghdr *h, uint bufsize, int code, ip4_addr ip4) |
95616c82 | 539 | { |
29a64162 OZ |
540 | ip4 = ip4_hton(ip4); |
541 | nl_add_attr(h, bufsize, code, &ip4, sizeof(ip4)); | |
542 | } | |
543 | ||
544 | static inline void | |
545 | nl_add_attr_ip6(struct nlmsghdr *h, uint bufsize, int code, ip6_addr ip6) | |
546 | { | |
547 | ip6 = ip6_hton(ip6); | |
548 | nl_add_attr(h, bufsize, code, &ip6, sizeof(ip6)); | |
549 | } | |
550 | ||
551 | static inline void | |
552 | nl_add_attr_ipa(struct nlmsghdr *h, uint bufsize, int code, ip_addr ipa) | |
553 | { | |
554 | if (ipa_is_ip4(ipa)) | |
555 | nl_add_attr_ip4(h, bufsize, code, ipa_to_ip4(ipa)); | |
9b136840 | 556 | else |
29a64162 | 557 | nl_add_attr_ip6(h, bufsize, code, ipa_to_ip6(ipa)); |
95616c82 OZ |
558 | } |
559 | ||
6b0f5f68 | 560 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
561 | static inline void |
562 | nl_add_attr_mpls(struct nlmsghdr *h, uint bufsize, int code, int len, u32 *stack) | |
9fdf9d29 | 563 | { |
d14f8c3c JMM |
564 | char buf[len*4]; |
565 | mpls_put(buf, len, stack); | |
566 | nl_add_attr(h, bufsize, code, buf, len*4); | |
9fdf9d29 | 567 | } |
95616c82 OZ |
568 | |
569 | static inline void | |
d14f8c3c | 570 | nl_add_attr_mpls_encap(struct nlmsghdr *h, uint bufsize, int len, u32 *stack) |
95616c82 | 571 | { |
d14f8c3c JMM |
572 | nl_add_attr_u16(h, bufsize, RTA_ENCAP_TYPE, LWTUNNEL_ENCAP_MPLS); |
573 | ||
574 | struct rtattr *nest = nl_open_attr(h, bufsize, RTA_ENCAP); | |
575 | nl_add_attr_mpls(h, bufsize, RTA_DST, len, stack); | |
576 | nl_close_attr(h, nest); | |
577 | } | |
578 | ||
579 | static inline void | |
580 | nl_add_attr_via(struct nlmsghdr *h, uint bufsize, ip_addr ipa) | |
581 | { | |
66acbc8d | 582 | struct rtvia *via = alloca(sizeof(struct rtvia) + 16); |
d14f8c3c | 583 | |
62e64905 OZ |
584 | if (ipa_is_ip4(ipa)) |
585 | { | |
d14f8c3c | 586 | via->rtvia_family = AF_INET; |
62e64905 | 587 | put_ip4(via->rtvia_addr, ipa_to_ip4(ipa)); |
66acbc8d | 588 | nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 4); |
62e64905 OZ |
589 | } |
590 | else | |
591 | { | |
d14f8c3c | 592 | via->rtvia_family = AF_INET6; |
62e64905 | 593 | put_ip6(via->rtvia_addr, ipa_to_ip6(ipa)); |
66acbc8d | 594 | nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 16); |
d14f8c3c | 595 | } |
95616c82 | 596 | } |
6b0f5f68 | 597 | #endif |
95616c82 | 598 | |
9fdf9d29 OZ |
599 | static inline struct rtnexthop * |
600 | nl_open_nexthop(struct nlmsghdr *h, uint bufsize) | |
601 | { | |
602 | uint pos = NLMSG_ALIGN(h->nlmsg_len); | |
603 | uint len = RTNH_LENGTH(0); | |
604 | ||
605 | if (pos + len > bufsize) | |
606 | bug("nl_open_nexthop: packet buffer overflow"); | |
607 | ||
608 | h->nlmsg_len = pos + len; | |
609 | ||
610 | return (void *)h + pos; | |
611 | } | |
612 | ||
613 | static inline void | |
614 | nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh) | |
615 | { | |
616 | nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh; | |
617 | } | |
95616c82 | 618 | |
d14f8c3c | 619 | static inline void |
6b0f5f68 | 620 | nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af UNUSED) |
d14f8c3c | 621 | { |
6b0f5f68 | 622 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
623 | if (nh->labels > 0) |
624 | if (af == AF_MPLS) | |
625 | nl_add_attr_mpls(h, bufsize, RTA_NEWDST, nh->labels, nh->label); | |
626 | else | |
627 | nl_add_attr_mpls_encap(h, bufsize, nh->labels, nh->label); | |
628 | ||
629 | if (ipa_nonzero(nh->gw)) | |
53401bef OZ |
630 | { |
631 | if (af == (ipa_is_ip4(nh->gw) ? AF_INET : AF_INET6)) | |
d14f8c3c | 632 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); |
53401bef OZ |
633 | else |
634 | nl_add_attr_via(h, bufsize, nh->gw); | |
635 | } | |
6b0f5f68 MJM |
636 | #else |
637 | ||
638 | if (ipa_nonzero(nh->gw)) | |
639 | nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw); | |
640 | #endif | |
d14f8c3c JMM |
641 | } |
642 | ||
95616c82 | 643 | static void |
d14f8c3c | 644 | nl_add_multipath(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af) |
95616c82 | 645 | { |
9fdf9d29 OZ |
646 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH); |
647 | ||
95616c82 | 648 | for (; nh; nh = nh->next) |
9fdf9d29 OZ |
649 | { |
650 | struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize); | |
95616c82 | 651 | |
9fdf9d29 OZ |
652 | rtnh->rtnh_flags = 0; |
653 | rtnh->rtnh_hops = nh->weight; | |
654 | rtnh->rtnh_ifindex = nh->iface->index; | |
95616c82 | 655 | |
d14f8c3c | 656 | nl_add_nexthop(h, bufsize, nh, af); |
95616c82 | 657 | |
a1f5e514 OZ |
658 | if (nh->flags & RNF_ONLINK) |
659 | rtnh->rtnh_flags |= RTNH_F_ONLINK; | |
660 | ||
9fdf9d29 OZ |
661 | nl_close_nexthop(h, rtnh); |
662 | } | |
663 | ||
664 | nl_close_attr(h, a); | |
665 | } | |
95616c82 | 666 | |
4e276a89 | 667 | static struct nexthop * |
3e792350 | 668 | nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr *ra, int af) |
95616c82 | 669 | { |
ad276157 | 670 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 | 671 | struct rtnexthop *nh = RTA_DATA(ra); |
4e276a89 | 672 | struct nexthop *rv, *first, **last; |
3e236955 | 673 | unsigned len = RTA_PAYLOAD(ra); |
95616c82 OZ |
674 | |
675 | first = NULL; | |
676 | last = &first; | |
95616c82 OZ |
677 | |
678 | while (len) | |
679 | { | |
680 | /* Use RTNH_OK(nh,len) ?? */ | |
681 | if ((len < sizeof(*nh)) || (len < nh->rtnh_len)) | |
682 | return NULL; | |
683 | ||
3e792350 | 684 | *last = rv = lp_allocz(s->pool, NEXTHOP_MAX_SIZE); |
95616c82 OZ |
685 | last = &(rv->next); |
686 | ||
687 | rv->weight = nh->rtnh_hops; | |
688 | rv->iface = if_find_by_index(nh->rtnh_ifindex); | |
689 | if (!rv->iface) | |
690 | return NULL; | |
691 | ||
692 | /* Nonexistent RTNH_PAYLOAD ?? */ | |
693 | nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0); | |
98bb80a2 OZ |
694 | switch (af) |
695 | { | |
98bb80a2 | 696 | case AF_INET: |
4ff15a75 | 697 | if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want4, a, sizeof(a))) |
98bb80a2 OZ |
698 | return NULL; |
699 | break; | |
4ff15a75 | 700 | |
98bb80a2 | 701 | case AF_INET6: |
4ff15a75 | 702 | if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want6, a, sizeof(a))) |
98bb80a2 OZ |
703 | return NULL; |
704 | break; | |
4ff15a75 | 705 | |
98bb80a2 OZ |
706 | default: |
707 | return NULL; | |
708 | } | |
709 | ||
95616c82 | 710 | if (a[RTA_GATEWAY]) |
53401bef | 711 | rv->gw = rta_get_ipa(a[RTA_GATEWAY]); |
95616c82 | 712 | |
53401bef OZ |
713 | #ifdef HAVE_MPLS_KERNEL |
714 | if (a[RTA_VIA]) | |
715 | rv->gw = rta_get_via(a[RTA_VIA]); | |
716 | #endif | |
717 | ||
718 | if (ipa_nonzero(rv->gw)) | |
719 | { | |
a1f5e514 OZ |
720 | if (nh->rtnh_flags & RTNH_F_ONLINK) |
721 | rv->flags |= RNF_ONLINK; | |
722 | ||
23c212e7 | 723 | neighbor *nbr; |
586c1800 OZ |
724 | nbr = neigh_find(&p->p, rv->gw, rv->iface, |
725 | (rv->flags & RNF_ONLINK) ? NEF_ONLINK : 0); | |
23c212e7 | 726 | if (!nbr || (nbr->scope == SCOPE_HOST)) |
95616c82 OZ |
727 | return NULL; |
728 | } | |
62e64905 | 729 | |
6b0f5f68 | 730 | #ifdef HAVE_MPLS_KERNEL |
2eaf65ec | 731 | if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE]) |
6b0f5f68 MJM |
732 | { |
733 | if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) { | |
734 | log(L_WARN "KRT: Unknown encapsulation method %d in multipath", rta_get_u16(a[RTA_ENCAP_TYPE])); | |
735 | return NULL; | |
d14f8c3c JMM |
736 | } |
737 | ||
6b0f5f68 MJM |
738 | struct rtattr *enca[BIRD_RTA_MAX]; |
739 | nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]); | |
740 | nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca)); | |
741 | rv->labels = rta_get_mpls(enca[RTA_DST], rv->label); | |
6b0f5f68 MJM |
742 | } |
743 | #endif | |
744 | ||
95616c82 OZ |
745 | |
746 | len -= NLMSG_ALIGN(nh->rtnh_len); | |
747 | nh = RTNH_NEXT(nh); | |
748 | } | |
749 | ||
59d3a361 OZ |
750 | /* Ensure nexthops are sorted to satisfy nest invariant */ |
751 | if (!nexthop_is_sorted(first)) | |
752 | first = nexthop_sort(first); | |
753 | ||
95616c82 OZ |
754 | return first; |
755 | } | |
756 | ||
9fdf9d29 OZ |
757 | static void |
758 | nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max) | |
759 | { | |
760 | struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS); | |
761 | int t; | |
762 | ||
763 | for (t = 1; t < max; t++) | |
764 | if (metrics[0] & (1 << t)) | |
765 | nl_add_attr_u32(h, bufsize, t, metrics[t]); | |
766 | ||
767 | nl_close_attr(h, a); | |
768 | } | |
769 | ||
770 | static int | |
771 | nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max) | |
772 | { | |
773 | struct rtattr *a = RTA_DATA(hdr); | |
774 | int len = RTA_PAYLOAD(hdr); | |
775 | ||
776 | metrics[0] = 0; | |
777 | for (; RTA_OK(a, len); a = RTA_NEXT(a, len)) | |
778 | { | |
779 | if (a->rta_type == RTA_UNSPEC) | |
780 | continue; | |
781 | ||
782 | if (a->rta_type >= max) | |
783 | continue; | |
784 | ||
785 | if (RTA_PAYLOAD(a) != 4) | |
786 | return -1; | |
787 | ||
788 | metrics[0] |= 1 << a->rta_type; | |
acb04cfd | 789 | metrics[a->rta_type] = rta_get_u32(a); |
9fdf9d29 OZ |
790 | } |
791 | ||
792 | if (len > 0) | |
793 | return -1; | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
95616c82 OZ |
798 | |
799 | /* | |
800 | * Scanning of interfaces | |
801 | */ | |
802 | ||
803 | static void | |
804 | nl_parse_link(struct nlmsghdr *h, int scan) | |
805 | { | |
806 | struct ifinfomsg *i; | |
ad276157 | 807 | struct rtattr *a[BIRD_IFLA_MAX]; |
95616c82 OZ |
808 | int new = h->nlmsg_type == RTM_NEWLINK; |
809 | struct iface f = {}; | |
810 | struct iface *ifi; | |
811 | char *name; | |
943478b0 | 812 | u32 mtu, master = 0; |
ae80a2de | 813 | uint fl; |
95616c82 | 814 | |
ad276157 | 815 | if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a))) |
95616c82 | 816 | return; |
ad276157 | 817 | if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU]) |
95616c82 | 818 | { |
ad276157 JMM |
819 | /* |
820 | * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come | |
821 | * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists. | |
822 | * We simply ignore all such messages with IFLA_WIRELESS without notice. | |
823 | */ | |
824 | ||
825 | if (a[IFLA_WIRELESS]) | |
826 | return; | |
827 | ||
828 | log(L_ERR "KIF: Malformed message received"); | |
95616c82 OZ |
829 | return; |
830 | } | |
ad276157 | 831 | |
95616c82 | 832 | name = RTA_DATA(a[IFLA_IFNAME]); |
acb04cfd | 833 | mtu = rta_get_u32(a[IFLA_MTU]); |
95616c82 | 834 | |
943478b0 OZ |
835 | if (a[IFLA_MASTER]) |
836 | master = rta_get_u32(a[IFLA_MASTER]); | |
837 | ||
95616c82 OZ |
838 | ifi = if_find_by_index(i->ifi_index); |
839 | if (!new) | |
840 | { | |
841 | DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name); | |
842 | if (!ifi) | |
843 | return; | |
844 | ||
845 | if_delete(ifi); | |
846 | } | |
847 | else | |
848 | { | |
849 | DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags); | |
850 | if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1)) | |
851 | if_delete(ifi); | |
852 | ||
853 | strncpy(f.name, name, sizeof(f.name)-1); | |
854 | f.index = i->ifi_index; | |
855 | f.mtu = mtu; | |
856 | ||
943478b0 OZ |
857 | f.master_index = master; |
858 | f.master = if_find_by_index(master); | |
859 | ||
95616c82 OZ |
860 | fl = i->ifi_flags; |
861 | if (fl & IFF_UP) | |
862 | f.flags |= IF_ADMIN_UP; | |
863 | if (fl & IFF_LOWER_UP) | |
864 | f.flags |= IF_LINK_UP; | |
865 | if (fl & IFF_LOOPBACK) /* Loopback */ | |
866 | f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE; | |
867 | else if (fl & IFF_POINTOPOINT) /* PtP */ | |
868 | f.flags |= IF_MULTICAST; | |
869 | else if (fl & IFF_BROADCAST) /* Broadcast */ | |
870 | f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST; | |
871 | else | |
872 | f.flags |= IF_MULTIACCESS; /* NBMA */ | |
3216eb03 | 873 | |
16a3254c OZ |
874 | if (fl & IFF_MULTICAST) |
875 | f.flags |= IF_MULTICAST; | |
876 | ||
3216eb03 OZ |
877 | ifi = if_update(&f); |
878 | ||
879 | if (!scan) | |
880 | if_end_partial_update(ifi); | |
95616c82 OZ |
881 | } |
882 | } | |
883 | ||
884 | static void | |
9b136840 | 885 | nl_parse_addr4(struct ifaddrmsg *i, int scan, int new) |
95616c82 | 886 | { |
ad276157 | 887 | struct rtattr *a[BIRD_IFA_MAX]; |
95616c82 | 888 | struct iface *ifi; |
e37d2e3e | 889 | u32 ifa_flags; |
95616c82 OZ |
890 | int scope; |
891 | ||
9b136840 | 892 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a))) |
95616c82 | 893 | return; |
ad276157 | 894 | |
9b136840 | 895 | if (!a[IFA_LOCAL]) |
ad276157 | 896 | { |
9b136840 JMM |
897 | log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)"); |
898 | return; | |
ad276157 | 899 | } |
ad276157 | 900 | if (!a[IFA_ADDRESS]) |
95616c82 | 901 | { |
ad276157 | 902 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); |
95616c82 OZ |
903 | return; |
904 | } | |
905 | ||
906 | ifi = if_find_by_index(i->ifa_index); | |
907 | if (!ifi) | |
908 | { | |
909 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
910 | return; | |
911 | } | |
912 | ||
e37d2e3e OZ |
913 | if (a[IFA_FLAGS]) |
914 | ifa_flags = rta_get_u32(a[IFA_FLAGS]); | |
915 | else | |
916 | ifa_flags = i->ifa_flags; | |
917 | ||
9b136840 | 918 | struct ifa ifa; |
95616c82 OZ |
919 | bzero(&ifa, sizeof(ifa)); |
920 | ifa.iface = ifi; | |
cc5b93f7 | 921 | if (ifa_flags & IFA_F_SECONDARY) |
95616c82 OZ |
922 | ifa.flags |= IA_SECONDARY; |
923 | ||
9b136840 JMM |
924 | ifa.ip = rta_get_ipa(a[IFA_LOCAL]); |
925 | ||
d7661fbe | 926 | if (i->ifa_prefixlen > IP4_MAX_PREFIX_LENGTH) |
95616c82 OZ |
927 | { |
928 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
929 | new = 0; | |
930 | } | |
d7661fbe | 931 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH) |
95616c82 | 932 | { |
9b136840 JMM |
933 | ifa.brd = rta_get_ipa(a[IFA_ADDRESS]); |
934 | net_fill_ip4(&ifa.prefix, rta_get_ip4(a[IFA_ADDRESS]), i->ifa_prefixlen); | |
95616c82 OZ |
935 | |
936 | /* It is either a host address or a peer address */ | |
9b136840 | 937 | if (ipa_equal(ifa.ip, ifa.brd)) |
95616c82 OZ |
938 | ifa.flags |= IA_HOST; |
939 | else | |
940 | { | |
941 | ifa.flags |= IA_PEER; | |
9b136840 | 942 | ifa.opposite = ifa.brd; |
95616c82 OZ |
943 | } |
944 | } | |
945 | else | |
946 | { | |
9b136840 JMM |
947 | net_fill_ip4(&ifa.prefix, ipa_to_ip4(ifa.ip), i->ifa_prefixlen); |
948 | net_normalize(&ifa.prefix); | |
949 | ||
d7661fbe | 950 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 1) |
95616c82 OZ |
951 | ifa.opposite = ipa_opposite_m1(ifa.ip); |
952 | ||
d7661fbe | 953 | if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 2) |
95616c82 OZ |
954 | ifa.opposite = ipa_opposite_m2(ifa.ip); |
955 | ||
956 | if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST]) | |
957 | { | |
9b136840 JMM |
958 | ip4_addr xbrd = rta_get_ip4(a[IFA_BROADCAST]); |
959 | ip4_addr ybrd = ip4_or(ipa_to_ip4(ifa.ip), ip4_not(ip4_mkmask(i->ifa_prefixlen))); | |
960 | ||
961 | if (ip4_equal(xbrd, net4_prefix(&ifa.prefix)) || ip4_equal(xbrd, ybrd)) | |
962 | ifa.brd = ipa_from_ip4(xbrd); | |
95616c82 | 963 | else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */ |
9b136840 | 964 | { |
e691d16a | 965 | log(L_ERR "KIF: Invalid broadcast address %I4 for %s", xbrd, ifi->name); |
9b136840 JMM |
966 | ifa.brd = ipa_from_ip4(ybrd); |
967 | } | |
968 | } | |
969 | } | |
970 | ||
971 | scope = ipa_classify(ifa.ip); | |
972 | if (scope < 0) | |
973 | { | |
974 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
975 | return; | |
976 | } | |
977 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
978 | ||
979 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n", | |
980 | ifi->index, ifi->name, | |
981 | new ? "added" : "removed", | |
4659b2ae | 982 | ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite); |
9b136840 JMM |
983 | |
984 | if (new) | |
985 | ifa_update(&ifa); | |
986 | else | |
987 | ifa_delete(&ifa); | |
988 | ||
989 | if (!scan) | |
990 | if_end_partial_update(ifi); | |
991 | } | |
992 | ||
993 | static void | |
994 | nl_parse_addr6(struct ifaddrmsg *i, int scan, int new) | |
995 | { | |
996 | struct rtattr *a[BIRD_IFA_MAX]; | |
997 | struct iface *ifi; | |
cc5b93f7 | 998 | u32 ifa_flags; |
9b136840 JMM |
999 | int scope; |
1000 | ||
1001 | if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a))) | |
1002 | return; | |
1003 | ||
1004 | if (!a[IFA_ADDRESS]) | |
1005 | { | |
1006 | log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)"); | |
1007 | return; | |
1008 | } | |
1009 | ||
1010 | ifi = if_find_by_index(i->ifa_index); | |
1011 | if (!ifi) | |
1012 | { | |
1013 | log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index); | |
1014 | return; | |
1015 | } | |
1016 | ||
cc5b93f7 OZ |
1017 | if (a[IFA_FLAGS]) |
1018 | ifa_flags = rta_get_u32(a[IFA_FLAGS]); | |
1019 | else | |
1020 | ifa_flags = i->ifa_flags; | |
1021 | ||
9b136840 JMM |
1022 | struct ifa ifa; |
1023 | bzero(&ifa, sizeof(ifa)); | |
1024 | ifa.iface = ifi; | |
e37d2e3e | 1025 | if (ifa_flags & IFA_F_SECONDARY) |
9b136840 JMM |
1026 | ifa.flags |= IA_SECONDARY; |
1027 | ||
e37d2e3e OZ |
1028 | /* Ignore tentative addresses silently */ |
1029 | if (ifa_flags & IFA_F_TENTATIVE) | |
1030 | return; | |
9b136840 | 1031 | |
95616c82 | 1032 | /* IFA_LOCAL can be unset for IPv6 interfaces */ |
9b136840 JMM |
1033 | ifa.ip = rta_get_ipa(a[IFA_LOCAL] ? : a[IFA_ADDRESS]); |
1034 | ||
d7661fbe | 1035 | if (i->ifa_prefixlen > IP6_MAX_PREFIX_LENGTH) |
9b136840 JMM |
1036 | { |
1037 | log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen); | |
1038 | new = 0; | |
1039 | } | |
d7661fbe | 1040 | if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH) |
9b136840 JMM |
1041 | { |
1042 | ifa.brd = rta_get_ipa(a[IFA_ADDRESS]); | |
1043 | net_fill_ip6(&ifa.prefix, rta_get_ip6(a[IFA_ADDRESS]), i->ifa_prefixlen); | |
1044 | ||
1045 | /* It is either a host address or a peer address */ | |
1046 | if (ipa_equal(ifa.ip, ifa.brd)) | |
1047 | ifa.flags |= IA_HOST; | |
1048 | else | |
1049 | { | |
1050 | ifa.flags |= IA_PEER; | |
1051 | ifa.opposite = ifa.brd; | |
95616c82 | 1052 | } |
9b136840 JMM |
1053 | } |
1054 | else | |
1055 | { | |
1056 | net_fill_ip6(&ifa.prefix, ipa_to_ip6(ifa.ip), i->ifa_prefixlen); | |
1057 | net_normalize(&ifa.prefix); | |
1058 | ||
d7661fbe | 1059 | if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH - 1) |
9b136840 | 1060 | ifa.opposite = ipa_opposite_m1(ifa.ip); |
95616c82 OZ |
1061 | } |
1062 | ||
1063 | scope = ipa_classify(ifa.ip); | |
1064 | if (scope < 0) | |
1065 | { | |
1066 | log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name); | |
1067 | return; | |
1068 | } | |
1069 | ifa.scope = scope & IADDR_SCOPE_MASK; | |
1070 | ||
9b136840 | 1071 | DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n", |
95616c82 OZ |
1072 | ifi->index, ifi->name, |
1073 | new ? "added" : "removed", | |
4659b2ae | 1074 | ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite); |
3216eb03 | 1075 | |
95616c82 OZ |
1076 | if (new) |
1077 | ifa_update(&ifa); | |
1078 | else | |
1079 | ifa_delete(&ifa); | |
3216eb03 OZ |
1080 | |
1081 | if (!scan) | |
1082 | if_end_partial_update(ifi); | |
95616c82 OZ |
1083 | } |
1084 | ||
9b136840 JMM |
1085 | static void |
1086 | nl_parse_addr(struct nlmsghdr *h, int scan) | |
1087 | { | |
1088 | struct ifaddrmsg *i; | |
1089 | ||
1090 | if (!(i = nl_checkin(h, sizeof(*i)))) | |
1091 | return; | |
1092 | ||
1093 | int new = (h->nlmsg_type == RTM_NEWADDR); | |
1094 | ||
1095 | switch (i->ifa_family) | |
1096 | { | |
9b136840 JMM |
1097 | case AF_INET: |
1098 | return nl_parse_addr4(i, scan, new); | |
29a64162 | 1099 | |
9b136840 JMM |
1100 | case AF_INET6: |
1101 | return nl_parse_addr6(i, scan, new); | |
9b136840 JMM |
1102 | } |
1103 | } | |
1104 | ||
95616c82 OZ |
1105 | void |
1106 | kif_do_scan(struct kif_proto *p UNUSED) | |
1107 | { | |
1108 | struct nlmsghdr *h; | |
1109 | ||
1110 | if_start_update(); | |
1111 | ||
86c3eea0 | 1112 | nl_request_dump(AF_UNSPEC, RTM_GETLINK); |
95616c82 OZ |
1113 | while (h = nl_get_scan()) |
1114 | if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK) | |
1115 | nl_parse_link(h, 1); | |
1116 | else | |
1117 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1118 | |
943478b0 OZ |
1119 | /* Re-resolve master interface for slaves */ |
1120 | struct iface *i; | |
1121 | WALK_LIST(i, iface_list) | |
1122 | if (i->master_index) | |
1123 | { | |
1124 | struct iface f = { | |
1125 | .flags = i->flags, | |
1126 | .mtu = i->mtu, | |
1127 | .index = i->index, | |
1128 | .master_index = i->master_index, | |
1129 | .master = if_find_by_index(i->master_index) | |
1130 | }; | |
1131 | ||
1132 | if (f.master != i->master) | |
1133 | { | |
1134 | memcpy(f.name, i->name, sizeof(f.name)); | |
1135 | if_update(&f); | |
1136 | } | |
1137 | } | |
1138 | ||
d7661fbe | 1139 | nl_request_dump(AF_INET, RTM_GETADDR); |
95616c82 OZ |
1140 | while (h = nl_get_scan()) |
1141 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
3216eb03 | 1142 | nl_parse_addr(h, 1); |
95616c82 OZ |
1143 | else |
1144 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1145 | |
d7661fbe JMM |
1146 | nl_request_dump(AF_INET6, RTM_GETADDR); |
1147 | while (h = nl_get_scan()) | |
1148 | if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) | |
1149 | nl_parse_addr(h, 1); | |
1150 | else | |
1151 | log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type); | |
29a64162 | 1152 | |
95616c82 OZ |
1153 | if_end_update(); |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Routes | |
1158 | */ | |
1159 | ||
9ddbfbdd JMM |
1160 | static inline u32 |
1161 | krt_table_id(struct krt_proto *p) | |
1162 | { | |
1163 | return KRT_CF->sys.table_id; | |
1164 | } | |
1165 | ||
1166 | static HASH(struct krt_proto) nl_table_map; | |
1167 | ||
29a64162 OZ |
1168 | #define RTH_KEY(p) p->af, krt_table_id(p) |
1169 | #define RTH_NEXT(p) p->sys.hash_next | |
1170 | #define RTH_EQ(a1,i1,a2,i2) a1 == a2 && i1 == i2 | |
1171 | #define RTH_FN(a,i) a ^ u32_hash(i) | |
9ddbfbdd JMM |
1172 | |
1173 | #define RTH_REHASH rth_rehash | |
1174 | #define RTH_PARAMS /8, *2, 2, 2, 6, 20 | |
1175 | ||
1176 | HASH_DEFINE_REHASH_FN(RTH, struct krt_proto) | |
95616c82 OZ |
1177 | |
1178 | int | |
1179 | krt_capable(rte *e) | |
1180 | { | |
1181 | rta *a = e->attrs; | |
1182 | ||
95616c82 | 1183 | switch (a->dest) |
62e64905 | 1184 | { |
4e276a89 | 1185 | case RTD_UNICAST: |
95616c82 OZ |
1186 | case RTD_BLACKHOLE: |
1187 | case RTD_UNREACHABLE: | |
1188 | case RTD_PROHIBIT: | |
62e64905 OZ |
1189 | return 1; |
1190 | ||
95616c82 OZ |
1191 | default: |
1192 | return 0; | |
62e64905 | 1193 | } |
95616c82 OZ |
1194 | } |
1195 | ||
1196 | static inline int | |
4e276a89 | 1197 | nh_bufsize(struct nexthop *nh) |
95616c82 OZ |
1198 | { |
1199 | int rv = 0; | |
1200 | for (; nh != NULL; nh = nh->next) | |
9fdf9d29 | 1201 | rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr))); |
95616c82 OZ |
1202 | return rv; |
1203 | } | |
1204 | ||
1205 | static int | |
13c0be19 | 1206 | nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh) |
95616c82 OZ |
1207 | { |
1208 | eattr *ea; | |
1209 | net *net = e->net; | |
1210 | rta *a = e->attrs; | |
13c0be19 | 1211 | ea_list *eattrs = a->eattrs; |
4e276a89 | 1212 | int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(&(a->nh)); |
4adcb9df | 1213 | u32 priority = 0; |
a8caff32 | 1214 | |
95616c82 OZ |
1215 | struct { |
1216 | struct nlmsghdr h; | |
1217 | struct rtmsg r; | |
a8caff32 JMM |
1218 | char buf[0]; |
1219 | } *r; | |
1220 | ||
1221 | int rsize = sizeof(*r) + bufsize; | |
1222 | r = alloca(rsize); | |
95616c82 | 1223 | |
cc5b93f7 | 1224 | DBG("nl_send_route(%N,op=%x)\n", net->n.addr, op); |
95616c82 | 1225 | |
a8caff32 JMM |
1226 | bzero(&r->h, sizeof(r->h)); |
1227 | bzero(&r->r, sizeof(r->r)); | |
cc5b93f7 | 1228 | r->h.nlmsg_type = op ? RTM_NEWROUTE : RTM_DELROUTE; |
a8caff32 | 1229 | r->h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
cc5b93f7 | 1230 | r->h.nlmsg_flags = op | NLM_F_REQUEST | NLM_F_ACK; |
95616c82 | 1231 | |
a8caff32 JMM |
1232 | r->r.rtm_family = p->af; |
1233 | r->r.rtm_dst_len = net_pxlen(net->n.addr); | |
1234 | r->r.rtm_protocol = RTPROT_BIRD; | |
7074be22 | 1235 | r->r.rtm_scope = RT_SCOPE_NOWHERE; |
6b0f5f68 | 1236 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
1237 | if (p->af == AF_MPLS) |
1238 | { | |
66acbc8d OZ |
1239 | /* |
1240 | * Kernel MPLS code is a bit picky. We must: | |
1241 | * 1) Always set RT_SCOPE_UNIVERSE and RTN_UNICAST (even for RTM_DELROUTE) | |
1242 | * 2) Never use RTA_PRIORITY | |
1243 | */ | |
1244 | ||
d14f8c3c JMM |
1245 | u32 label = net_mpls(net->n.addr); |
1246 | nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label); | |
66acbc8d OZ |
1247 | r->r.rtm_scope = RT_SCOPE_UNIVERSE; |
1248 | r->r.rtm_type = RTN_UNICAST; | |
d14f8c3c JMM |
1249 | } |
1250 | else | |
6b0f5f68 | 1251 | #endif |
be17805c | 1252 | { |
d14f8c3c | 1253 | nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr)); |
95616c82 | 1254 | |
be17805c OZ |
1255 | /* Add source address for IPv6 SADR routes */ |
1256 | if (net->n.addr->type == NET_IP6_SADR) | |
1257 | { | |
1258 | net_addr_ip6_sadr *a = (void *) &net->n.addr; | |
1259 | nl_add_attr_ip6(&r->h, rsize, RTA_SRC, a->src_prefix); | |
1260 | r->r.rtm_src_len = a->src_pxlen; | |
1261 | } | |
1262 | } | |
1263 | ||
2feaa693 OZ |
1264 | /* |
1265 | * Strange behavior for RTM_DELROUTE: | |
1266 | * 1) rtm_family is ignored in IPv6, works for IPv4 | |
1267 | * 2) not setting RTA_PRIORITY is different from setting default value (on IPv6) | |
1268 | * 3) not setting RTA_PRIORITY is equivalent to setting 0, which is wildcard | |
1269 | */ | |
1270 | ||
9ddbfbdd | 1271 | if (krt_table_id(p) < 256) |
a8caff32 | 1272 | r->r.rtm_table = krt_table_id(p); |
9ddbfbdd | 1273 | else |
a8caff32 | 1274 | nl_add_attr_u32(&r->h, rsize, RTA_TABLE, krt_table_id(p)); |
9ddbfbdd | 1275 | |
66acbc8d OZ |
1276 | if (p->af == AF_MPLS) |
1277 | priority = 0; | |
1278 | else if (a->source == RTS_DUMMY) | |
4adcb9df OZ |
1279 | priority = e->u.krt.metric; |
1280 | else if (KRT_CF->sys.metric) | |
1281 | priority = KRT_CF->sys.metric; | |
1282 | else if ((op != NL_OP_DELETE) && (ea = ea_find(eattrs, EA_KRT_METRIC))) | |
1283 | priority = ea->u.data; | |
78a2cc28 | 1284 | |
4adcb9df | 1285 | if (priority) |
d1b8fe93 | 1286 | nl_add_attr_u32(&r->h, rsize, RTA_PRIORITY, priority); |
78a2cc28 | 1287 | |
2feaa693 OZ |
1288 | /* For route delete, we do not specify remaining route attributes */ |
1289 | if (op == NL_OP_DELETE) | |
1290 | goto dest; | |
78a2cc28 | 1291 | |
6e75d0d2 | 1292 | /* Default scope is LINK for device routes, UNIVERSE otherwise */ |
66acbc8d OZ |
1293 | if (p->af == AF_MPLS) |
1294 | r->r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1295 | else if (ea = ea_find(eattrs, EA_KRT_SCOPE)) | |
cc5b93f7 | 1296 | r->r.rtm_scope = ea->u.data; |
6e75d0d2 | 1297 | else |
4e276a89 | 1298 | r->r.rtm_scope = (dest == RTD_UNICAST && ipa_zero(nh->gw)) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE; |
95616c82 OZ |
1299 | |
1300 | if (ea = ea_find(eattrs, EA_KRT_PREFSRC)) | |
a8caff32 | 1301 | nl_add_attr_ipa(&r->h, rsize, RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); |
95616c82 OZ |
1302 | |
1303 | if (ea = ea_find(eattrs, EA_KRT_REALM)) | |
a8caff32 | 1304 | nl_add_attr_u32(&r->h, rsize, RTA_FLOW, ea->u.data); |
95616c82 | 1305 | |
9fdf9d29 OZ |
1306 | |
1307 | u32 metrics[KRT_METRICS_MAX]; | |
1308 | metrics[0] = 0; | |
1309 | ||
1310 | struct ea_walk_state ews = { .eattrs = eattrs }; | |
1311 | while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX)) | |
1312 | { | |
1313 | int id = ea->id - EA_KRT_METRICS; | |
1314 | metrics[0] |= 1 << id; | |
1315 | metrics[id] = ea->u.data; | |
1316 | } | |
1317 | ||
1318 | if (metrics[0]) | |
a8caff32 | 1319 | nl_add_metrics(&r->h, rsize, metrics, KRT_METRICS_MAX); |
9fdf9d29 OZ |
1320 | |
1321 | ||
2feaa693 | 1322 | dest: |
2feaa693 | 1323 | switch (dest) |
95616c82 | 1324 | { |
4e276a89 | 1325 | case RTD_UNICAST: |
a8caff32 | 1326 | r->r.rtm_type = RTN_UNICAST; |
4e276a89 | 1327 | if (nh->next && !krt_ecmp6(p)) |
d14f8c3c | 1328 | nl_add_multipath(&r->h, rsize, nh, p->af); |
4e276a89 JMM |
1329 | else |
1330 | { | |
1331 | nl_add_attr_u32(&r->h, rsize, RTA_OIF, nh->iface->index); | |
d14f8c3c | 1332 | nl_add_nexthop(&r->h, rsize, nh, p->af); |
a1f5e514 OZ |
1333 | |
1334 | if (nh->flags & RNF_ONLINK) | |
1335 | r->r.rtm_flags |= RTNH_F_ONLINK; | |
4e276a89 | 1336 | } |
95616c82 OZ |
1337 | break; |
1338 | case RTD_BLACKHOLE: | |
a8caff32 | 1339 | r->r.rtm_type = RTN_BLACKHOLE; |
95616c82 OZ |
1340 | break; |
1341 | case RTD_UNREACHABLE: | |
a8caff32 | 1342 | r->r.rtm_type = RTN_UNREACHABLE; |
95616c82 OZ |
1343 | break; |
1344 | case RTD_PROHIBIT: | |
a8caff32 | 1345 | r->r.rtm_type = RTN_PROHIBIT; |
95616c82 | 1346 | break; |
2feaa693 OZ |
1347 | case RTD_NONE: |
1348 | break; | |
95616c82 OZ |
1349 | default: |
1350 | bug("krt_capable inconsistent with nl_send_route"); | |
1351 | } | |
1352 | ||
2feaa693 | 1353 | /* Ignore missing for DELETE */ |
cc5b93f7 | 1354 | return nl_exchange(&r->h, (op == NL_OP_DELETE)); |
2feaa693 OZ |
1355 | } |
1356 | ||
1357 | static inline int | |
13c0be19 | 1358 | nl_add_rte(struct krt_proto *p, rte *e) |
2feaa693 OZ |
1359 | { |
1360 | rta *a = e->attrs; | |
1361 | int err = 0; | |
1362 | ||
4e276a89 | 1363 | if (krt_ecmp6(p) && a->nh.next) |
2feaa693 | 1364 | { |
4e276a89 | 1365 | struct nexthop *nh = &(a->nh); |
2feaa693 | 1366 | |
13c0be19 | 1367 | err = nl_send_route(p, e, NL_OP_ADD, RTD_UNICAST, nh); |
2feaa693 OZ |
1368 | if (err < 0) |
1369 | return err; | |
1370 | ||
1371 | for (nh = nh->next; nh; nh = nh->next) | |
13c0be19 | 1372 | err += nl_send_route(p, e, NL_OP_APPEND, RTD_UNICAST, nh); |
2feaa693 OZ |
1373 | |
1374 | return err; | |
1375 | } | |
1376 | ||
13c0be19 | 1377 | return nl_send_route(p, e, NL_OP_ADD, a->dest, &(a->nh)); |
2feaa693 OZ |
1378 | } |
1379 | ||
1380 | static inline int | |
13c0be19 | 1381 | nl_delete_rte(struct krt_proto *p, rte *e) |
2feaa693 OZ |
1382 | { |
1383 | int err = 0; | |
1384 | ||
1385 | /* For IPv6, we just repeatedly request DELETE until we get error */ | |
1386 | do | |
13c0be19 | 1387 | err = nl_send_route(p, e, NL_OP_DELETE, RTD_NONE, NULL); |
2feaa693 OZ |
1388 | while (krt_ecmp6(p) && !err); |
1389 | ||
1390 | return err; | |
95616c82 OZ |
1391 | } |
1392 | ||
8235c474 OZ |
1393 | static inline int |
1394 | nl_replace_rte(struct krt_proto *p, rte *e) | |
1395 | { | |
1396 | rta *a = e->attrs; | |
1397 | return nl_send_route(p, e, NL_OP_REPLACE, a->dest, &(a->nh)); | |
1398 | } | |
1399 | ||
1400 | ||
95616c82 | 1401 | void |
13c0be19 | 1402 | krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old) |
95616c82 OZ |
1403 | { |
1404 | int err = 0; | |
1405 | ||
1406 | /* | |
8235c474 OZ |
1407 | * We use NL_OP_REPLACE for IPv4, it has an issue with not checking for |
1408 | * matching rtm_protocol, but that is OK when dedicated priority is used. | |
2feaa693 | 1409 | * |
8235c474 OZ |
1410 | * We do not use NL_OP_REPLACE for IPv6, as it has broken semantics for ECMP |
1411 | * and with some kernel versions ECMP replace crashes kernel. Would need more | |
1412 | * testing and checks for kernel versions. | |
2feaa693 | 1413 | * |
8235c474 OZ |
1414 | * For IPv6, we use NL_OP_DELETE and then NL_OP_ADD. We also do not trust the |
1415 | * old route value, so we do not try to optimize IPv6 ECMP reconfigurations. | |
95616c82 OZ |
1416 | */ |
1417 | ||
8235c474 OZ |
1418 | if (krt_ipv4(p) && old && new) |
1419 | { | |
1420 | err = nl_replace_rte(p, new); | |
1421 | } | |
1422 | else | |
1423 | { | |
1424 | if (old) | |
1425 | nl_delete_rte(p, old); | |
95616c82 | 1426 | |
8235c474 OZ |
1427 | if (new) |
1428 | err = nl_add_rte(p, new); | |
1429 | } | |
95616c82 OZ |
1430 | |
1431 | if (err < 0) | |
1432 | n->n.flags |= KRF_SYNC_ERROR; | |
1433 | else | |
1434 | n->n.flags &= ~KRF_SYNC_ERROR; | |
1435 | } | |
1436 | ||
2feaa693 | 1437 | static int |
1187627a | 1438 | nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family) |
2feaa693 | 1439 | { |
1187627a OZ |
1440 | /* Route merging is used for IPv6 scans */ |
1441 | if (!s->scan || (rtm_family != AF_INET6)) | |
2feaa693 OZ |
1442 | return 0; |
1443 | ||
1444 | /* Saved and new route must have same network, proto/table, and priority */ | |
1445 | if ((s->net != net) || (s->proto != p) || (s->krt_metric != priority)) | |
1446 | return 0; | |
1447 | ||
1448 | /* Both must be regular unicast routes */ | |
1449 | if ((s->krt_type != RTN_UNICAST) || (krt_type != RTN_UNICAST)) | |
1450 | return 0; | |
1451 | ||
1452 | return 1; | |
1453 | } | |
1454 | ||
1455 | static void | |
1456 | nl_announce_route(struct nl_parse_state *s) | |
1457 | { | |
1458 | rte *e = rte_get_temp(s->attrs); | |
1459 | e->net = s->net; | |
1460 | e->u.krt.src = s->krt_src; | |
1461 | e->u.krt.proto = s->krt_proto; | |
1462 | e->u.krt.seen = 0; | |
1463 | e->u.krt.best = 0; | |
1464 | e->u.krt.metric = s->krt_metric; | |
1465 | ||
1466 | if (s->scan) | |
1467 | krt_got_route(s->proto, e); | |
1468 | else | |
1469 | krt_got_route_async(s->proto, e, s->new); | |
1470 | ||
1471 | s->net = NULL; | |
1472 | s->attrs = NULL; | |
1473 | s->proto = NULL; | |
1474 | lp_flush(s->pool); | |
1475 | } | |
1476 | ||
1477 | static inline void | |
1187627a | 1478 | nl_parse_begin(struct nl_parse_state *s, int scan) |
2feaa693 OZ |
1479 | { |
1480 | memset(s, 0, sizeof (struct nl_parse_state)); | |
1481 | s->pool = nl_linpool; | |
1482 | s->scan = scan; | |
2feaa693 OZ |
1483 | } |
1484 | ||
1485 | static inline void | |
1486 | nl_parse_end(struct nl_parse_state *s) | |
1487 | { | |
1488 | if (s->net) | |
1489 | nl_announce_route(s); | |
1490 | } | |
1491 | ||
1492 | ||
95616c82 OZ |
1493 | #define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0) |
1494 | ||
1495 | static void | |
2feaa693 | 1496 | nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) |
95616c82 OZ |
1497 | { |
1498 | struct krt_proto *p; | |
1499 | struct rtmsg *i; | |
ad276157 | 1500 | struct rtattr *a[BIRD_RTA_MAX]; |
95616c82 OZ |
1501 | int new = h->nlmsg_type == RTM_NEWROUTE; |
1502 | ||
be17805c | 1503 | net_addr dst, src = {}; |
95616c82 | 1504 | u32 oif = ~0; |
29a64162 | 1505 | u32 table_id; |
2feaa693 | 1506 | u32 priority = 0; |
6e75d0d2 | 1507 | u32 def_scope = RT_SCOPE_UNIVERSE; |
be17805c | 1508 | int krt_src; |
95616c82 | 1509 | |
ad276157 | 1510 | if (!(i = nl_checkin(h, sizeof(*i)))) |
95616c82 | 1511 | return; |
ad276157 JMM |
1512 | |
1513 | switch (i->rtm_family) | |
95616c82 | 1514 | { |
29a64162 OZ |
1515 | case AF_INET: |
1516 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a))) | |
1517 | return; | |
1518 | ||
1519 | if (a[RTA_DST]) | |
1520 | net_fill_ip4(&dst, rta_get_ip4(a[RTA_DST]), i->rtm_dst_len); | |
1521 | else | |
1522 | net_fill_ip4(&dst, IP4_NONE, 0); | |
1523 | break; | |
1524 | ||
cc5b93f7 OZ |
1525 | case AF_INET6: |
1526 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a))) | |
1527 | return; | |
29a64162 OZ |
1528 | |
1529 | if (a[RTA_DST]) | |
1530 | net_fill_ip6(&dst, rta_get_ip6(a[RTA_DST]), i->rtm_dst_len); | |
1531 | else | |
1532 | net_fill_ip6(&dst, IP6_NONE, 0); | |
be17805c OZ |
1533 | |
1534 | if (a[RTA_SRC]) | |
1535 | net_fill_ip6(&src, rta_get_ip6(a[RTA_SRC]), i->rtm_src_len); | |
1536 | else | |
1537 | net_fill_ip6(&src, IP6_NONE, 0); | |
29a64162 OZ |
1538 | break; |
1539 | ||
6b0f5f68 | 1540 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c JMM |
1541 | case AF_MPLS: |
1542 | if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want_mpls, a, sizeof(a))) | |
1543 | return; | |
1544 | ||
ed610044 OZ |
1545 | if (!a[RTA_DST]) |
1546 | SKIP("MPLS route without RTA_DST"); | |
1547 | ||
1548 | if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1) | |
1549 | SKIP("MPLS route with multi-label RTA_DST"); | |
1550 | ||
1551 | net_fill_mpls(&dst, rta_mpls_stack[0]); | |
d14f8c3c | 1552 | break; |
6b0f5f68 | 1553 | #endif |
d14f8c3c | 1554 | |
29a64162 OZ |
1555 | default: |
1556 | return; | |
95616c82 OZ |
1557 | } |
1558 | ||
95616c82 | 1559 | if (a[RTA_OIF]) |
acb04cfd | 1560 | oif = rta_get_u32(a[RTA_OIF]); |
95616c82 | 1561 | |
9ddbfbdd | 1562 | if (a[RTA_TABLE]) |
29a64162 | 1563 | table_id = rta_get_u32(a[RTA_TABLE]); |
9ddbfbdd | 1564 | else |
29a64162 | 1565 | table_id = i->rtm_table; |
9ddbfbdd | 1566 | |
29a64162 OZ |
1567 | /* Do we know this table? */ |
1568 | p = HASH_FIND(nl_table_map, RTH, i->rtm_family, table_id); | |
95616c82 | 1569 | if (!p) |
4659b2ae | 1570 | SKIP("unknown table %u\n", table_id); |
95616c82 | 1571 | |
be17805c OZ |
1572 | if (a[RTA_SRC] && (p->p.net_type != NET_IP6_SADR)) |
1573 | SKIP("src prefix for non-SADR channel\n"); | |
1574 | ||
95616c82 OZ |
1575 | if (a[RTA_IIF]) |
1576 | SKIP("IIF set\n"); | |
29a64162 | 1577 | |
95616c82 OZ |
1578 | if (i->rtm_tos != 0) /* We don't support TOS */ |
1579 | SKIP("TOS %02x\n", i->rtm_tos); | |
95616c82 | 1580 | |
2feaa693 | 1581 | if (s->scan && !new) |
95616c82 OZ |
1582 | SKIP("RTM_DELROUTE in scan\n"); |
1583 | ||
2feaa693 OZ |
1584 | if (a[RTA_PRIORITY]) |
1585 | priority = rta_get_u32(a[RTA_PRIORITY]); | |
1586 | ||
9b136840 | 1587 | int c = net_classify(&dst); |
95616c82 OZ |
1588 | if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) |
1589 | SKIP("strange class/scope\n"); | |
1590 | ||
95616c82 OZ |
1591 | switch (i->rtm_protocol) |
1592 | { | |
1593 | case RTPROT_UNSPEC: | |
1594 | SKIP("proto unspec\n"); | |
1595 | ||
1596 | case RTPROT_REDIRECT: | |
be17805c | 1597 | krt_src = KRT_SRC_REDIRECT; |
95616c82 OZ |
1598 | break; |
1599 | ||
1600 | case RTPROT_KERNEL: | |
be17805c | 1601 | krt_src = KRT_SRC_KERNEL; |
95616c82 OZ |
1602 | return; |
1603 | ||
1604 | case RTPROT_BIRD: | |
2feaa693 | 1605 | if (!s->scan) |
95616c82 | 1606 | SKIP("echo\n"); |
be17805c | 1607 | krt_src = KRT_SRC_BIRD; |
95616c82 OZ |
1608 | break; |
1609 | ||
1610 | case RTPROT_BOOT: | |
1611 | default: | |
be17805c | 1612 | krt_src = KRT_SRC_ALIEN; |
95616c82 OZ |
1613 | } |
1614 | ||
be17805c OZ |
1615 | net_addr *n = &dst; |
1616 | if (p->p.net_type == NET_IP6_SADR) | |
1617 | { | |
1618 | n = alloca(sizeof(net_addr_ip6_sadr)); | |
1619 | net_fill_ip6_sadr(n, net6_prefix(&dst), net6_pxlen(&dst), | |
1620 | net6_prefix(&src), net6_pxlen(&src)); | |
1621 | } | |
1622 | ||
1623 | net *net = net_get(p->p.main_channel->table, n); | |
95616c82 | 1624 | |
1187627a | 1625 | if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type, i->rtm_family)) |
2feaa693 OZ |
1626 | nl_announce_route(s); |
1627 | ||
d14f8c3c | 1628 | rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE); |
2feaa693 OZ |
1629 | ra->src = p->p.main_source; |
1630 | ra->source = RTS_INHERIT; | |
1631 | ra->scope = SCOPE_UNIVERSE; | |
95616c82 OZ |
1632 | |
1633 | switch (i->rtm_type) | |
1634 | { | |
1635 | case RTN_UNICAST: | |
62e64905 | 1636 | ra->dest = RTD_UNICAST; |
95616c82 | 1637 | |
98bb80a2 | 1638 | if (a[RTA_MULTIPATH]) |
4ff15a75 | 1639 | { |
3e792350 | 1640 | struct nexthop *nh = nl_parse_multipath(s, p, a[RTA_MULTIPATH], i->rtm_family); |
4e276a89 | 1641 | if (!nh) |
95616c82 | 1642 | { |
fe9f1a6d | 1643 | log(L_ERR "KRT: Received strange multipath route %N", net->n.addr); |
95616c82 OZ |
1644 | return; |
1645 | } | |
9fdf9d29 | 1646 | |
2eaf65ec | 1647 | nexthop_link(ra, nh); |
95616c82 OZ |
1648 | break; |
1649 | } | |
1650 | ||
4e276a89 JMM |
1651 | ra->nh.iface = if_find_by_index(oif); |
1652 | if (!ra->nh.iface) | |
95616c82 | 1653 | { |
fe9f1a6d | 1654 | log(L_ERR "KRT: Received route %N with unknown ifindex %u", net->n.addr, oif); |
95616c82 OZ |
1655 | return; |
1656 | } | |
1657 | ||
53401bef OZ |
1658 | if (a[RTA_GATEWAY]) |
1659 | ra->nh.gw = rta_get_ipa(a[RTA_GATEWAY]); | |
1660 | ||
6b0f5f68 | 1661 | #ifdef HAVE_MPLS_KERNEL |
53401bef OZ |
1662 | if (a[RTA_VIA]) |
1663 | ra->nh.gw = rta_get_via(a[RTA_VIA]); | |
6b0f5f68 | 1664 | #endif |
95616c82 | 1665 | |
53401bef OZ |
1666 | if (ipa_nonzero(ra->nh.gw)) |
1667 | { | |
95616c82 | 1668 | /* Silently skip strange 6to4 routes */ |
0bf95f99 | 1669 | const net_addr_ip6 sit = NET_ADDR_IP6(IP6_NONE, 96); |
4e276a89 | 1670 | if ((i->rtm_family == AF_INET6) && ipa_in_netX(ra->nh.gw, (net_addr *) &sit)) |
95616c82 OZ |
1671 | return; |
1672 | ||
a1f5e514 OZ |
1673 | if (i->rtm_flags & RTNH_F_ONLINK) |
1674 | ra->nh.flags |= RNF_ONLINK; | |
1675 | ||
23c212e7 | 1676 | neighbor *nbr; |
586c1800 OZ |
1677 | nbr = neigh_find(&p->p, ra->nh.gw, ra->nh.iface, |
1678 | (ra->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0); | |
23c212e7 | 1679 | if (!nbr || (nbr->scope == SCOPE_HOST)) |
95616c82 | 1680 | { |
4e276a89 JMM |
1681 | log(L_ERR "KRT: Received route %N with strange next-hop %I", net->n.addr, |
1682 | ra->nh.gw); | |
95616c82 OZ |
1683 | return; |
1684 | } | |
1685 | } | |
95616c82 OZ |
1686 | |
1687 | break; | |
1688 | case RTN_BLACKHOLE: | |
2feaa693 | 1689 | ra->dest = RTD_BLACKHOLE; |
95616c82 OZ |
1690 | break; |
1691 | case RTN_UNREACHABLE: | |
2feaa693 | 1692 | ra->dest = RTD_UNREACHABLE; |
95616c82 OZ |
1693 | break; |
1694 | case RTN_PROHIBIT: | |
2feaa693 | 1695 | ra->dest = RTD_PROHIBIT; |
95616c82 OZ |
1696 | break; |
1697 | /* FIXME: What about RTN_THROW? */ | |
1698 | default: | |
1699 | SKIP("type %d\n", i->rtm_type); | |
1700 | return; | |
1701 | } | |
1702 | ||
6b0f5f68 | 1703 | #ifdef HAVE_MPLS_KERNEL |
d14f8c3c | 1704 | if ((i->rtm_family == AF_MPLS) && a[RTA_NEWDST] && !ra->nh.next) |
2eaf65ec | 1705 | ra->nh.labels = rta_get_mpls(a[RTA_NEWDST], ra->nh.label); |
d14f8c3c JMM |
1706 | |
1707 | if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE] && !ra->nh.next) | |
1708 | { | |
1709 | switch (rta_get_u16(a[RTA_ENCAP_TYPE])) | |
1710 | { | |
1711 | case LWTUNNEL_ENCAP_MPLS: | |
1712 | { | |
1713 | struct rtattr *enca[BIRD_RTA_MAX]; | |
1714 | nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]); | |
1715 | nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca)); | |
2eaf65ec | 1716 | ra->nh.labels = rta_get_mpls(enca[RTA_DST], ra->nh.label); |
d14f8c3c JMM |
1717 | break; |
1718 | } | |
1719 | default: | |
1720 | SKIP("unknown encapsulation method %d\n", rta_get_u16(a[RTA_ENCAP_TYPE])); | |
1721 | break; | |
1722 | } | |
1723 | } | |
6b0f5f68 | 1724 | #endif |
d14f8c3c | 1725 | |
6e75d0d2 OZ |
1726 | if (i->rtm_scope != def_scope) |
1727 | { | |
1728 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); | |
1729 | ea->next = ra->eattrs; | |
1730 | ra->eattrs = ea; | |
1731 | ea->flags = EALF_SORTED; | |
1732 | ea->count = 1; | |
1733 | ea->attrs[0].id = EA_KRT_SCOPE; | |
1734 | ea->attrs[0].flags = 0; | |
1735 | ea->attrs[0].type = EAF_TYPE_INT; | |
1736 | ea->attrs[0].u.data = i->rtm_scope; | |
1737 | } | |
95616c82 OZ |
1738 | |
1739 | if (a[RTA_PREFSRC]) | |
1740 | { | |
9b136840 | 1741 | ip_addr ps = rta_get_ipa(a[RTA_PREFSRC]); |
95616c82 | 1742 | |
2feaa693 OZ |
1743 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); |
1744 | ea->next = ra->eattrs; | |
1745 | ra->eattrs = ea; | |
95616c82 OZ |
1746 | ea->flags = EALF_SORTED; |
1747 | ea->count = 1; | |
1748 | ea->attrs[0].id = EA_KRT_PREFSRC; | |
1749 | ea->attrs[0].flags = 0; | |
1750 | ea->attrs[0].type = EAF_TYPE_IP_ADDRESS; | |
4c553c5a MM |
1751 | |
1752 | struct adata *ad = lp_alloc(s->pool, sizeof(struct adata) + sizeof(ps)); | |
1753 | ad->length = sizeof(ps); | |
1754 | memcpy(ad->data, &ps, sizeof(ps)); | |
1755 | ||
1756 | ea->attrs[0].u.ptr = ad; | |
95616c82 OZ |
1757 | } |
1758 | ||
1759 | if (a[RTA_FLOW]) | |
1760 | { | |
2feaa693 OZ |
1761 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); |
1762 | ea->next = ra->eattrs; | |
1763 | ra->eattrs = ea; | |
95616c82 OZ |
1764 | ea->flags = EALF_SORTED; |
1765 | ea->count = 1; | |
1766 | ea->attrs[0].id = EA_KRT_REALM; | |
1767 | ea->attrs[0].flags = 0; | |
1768 | ea->attrs[0].type = EAF_TYPE_INT; | |
acb04cfd | 1769 | ea->attrs[0].u.data = rta_get_u32(a[RTA_FLOW]); |
95616c82 OZ |
1770 | } |
1771 | ||
9fdf9d29 OZ |
1772 | if (a[RTA_METRICS]) |
1773 | { | |
1774 | u32 metrics[KRT_METRICS_MAX]; | |
2feaa693 | 1775 | ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr)); |
9fdf9d29 OZ |
1776 | int t, n = 0; |
1777 | ||
1778 | if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0) | |
1779 | { | |
fe9f1a6d | 1780 | log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net->n.addr); |
9fdf9d29 OZ |
1781 | return; |
1782 | } | |
1783 | ||
1784 | for (t = 1; t < KRT_METRICS_MAX; t++) | |
1785 | if (metrics[0] & (1 << t)) | |
1786 | { | |
ee7e2ffd | 1787 | ea->attrs[n].id = EA_CODE(PROTOCOL_KERNEL, KRT_METRICS_OFFSET + t); |
9fdf9d29 OZ |
1788 | ea->attrs[n].flags = 0; |
1789 | ea->attrs[n].type = EAF_TYPE_INT; /* FIXME: Some are EAF_TYPE_BITFIELD */ | |
1790 | ea->attrs[n].u.data = metrics[t]; | |
1791 | n++; | |
1792 | } | |
1793 | ||
1794 | if (n > 0) | |
1795 | { | |
2feaa693 | 1796 | ea->next = ra->eattrs; |
9fdf9d29 OZ |
1797 | ea->flags = EALF_SORTED; |
1798 | ea->count = n; | |
2feaa693 | 1799 | ra->eattrs = ea; |
9fdf9d29 OZ |
1800 | } |
1801 | } | |
1802 | ||
2feaa693 OZ |
1803 | /* |
1804 | * Ideally, now we would send the received route to the rest of kernel code. | |
98bb80a2 OZ |
1805 | * But IPv6 ECMP routes before 4.11 are sent as a sequence of routes, so we |
1806 | * postpone it and merge next hops until the end of the sequence. Note that | |
3e792350 OZ |
1807 | * when doing merging of next hops, we expect the new route to be unipath. |
1808 | * Otherwise, we ignore additional next hops in nexthop_insert(). | |
2feaa693 OZ |
1809 | */ |
1810 | ||
1811 | if (!s->net) | |
1812 | { | |
1813 | /* Store the new route */ | |
1814 | s->net = net; | |
1815 | s->attrs = ra; | |
1816 | s->proto = p; | |
1817 | s->new = new; | |
be17805c | 1818 | s->krt_src = krt_src; |
2feaa693 OZ |
1819 | s->krt_type = i->rtm_type; |
1820 | s->krt_proto = i->rtm_protocol; | |
1821 | s->krt_metric = priority; | |
1822 | } | |
95616c82 | 1823 | else |
2feaa693 OZ |
1824 | { |
1825 | /* Merge next hops with the stored route */ | |
62e64905 | 1826 | rta *oa = s->attrs; |
2feaa693 | 1827 | |
62e64905 OZ |
1828 | struct nexthop *nhs = &oa->nh; |
1829 | nexthop_insert(&nhs, &ra->nh); | |
1830 | ||
1831 | /* Perhaps new nexthop is inserted at the first position */ | |
1832 | if (nhs == &ra->nh) | |
1833 | { | |
1834 | /* Swap rtas */ | |
1835 | s->attrs = ra; | |
1836 | ||
1837 | /* Keep old eattrs */ | |
1838 | ra->eattrs = oa->eattrs; | |
1839 | } | |
2feaa693 | 1840 | } |
95616c82 OZ |
1841 | } |
1842 | ||
1843 | void | |
1844 | krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */ | |
1845 | { | |
1846 | struct nlmsghdr *h; | |
2feaa693 | 1847 | struct nl_parse_state s; |
95616c82 | 1848 | |
1187627a OZ |
1849 | nl_parse_begin(&s, 1); |
1850 | nl_request_dump(AF_UNSPEC, RTM_GETROUTE); | |
95616c82 OZ |
1851 | while (h = nl_get_scan()) |
1852 | if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE) | |
2feaa693 | 1853 | nl_parse_route(&s, h); |
95616c82 OZ |
1854 | else |
1855 | log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type); | |
cc5b93f7 | 1856 | nl_parse_end(&s); |
95616c82 OZ |
1857 | } |
1858 | ||
1859 | /* | |
1860 | * Asynchronous Netlink interface | |
1861 | */ | |
1862 | ||
1863 | static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */ | |
1864 | static byte *nl_async_rx_buffer; /* Receive buffer */ | |
1865 | ||
1866 | static void | |
1867 | nl_async_msg(struct nlmsghdr *h) | |
1868 | { | |
2feaa693 OZ |
1869 | struct nl_parse_state s; |
1870 | ||
95616c82 OZ |
1871 | switch (h->nlmsg_type) |
1872 | { | |
1873 | case RTM_NEWROUTE: | |
1874 | case RTM_DELROUTE: | |
1875 | DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type); | |
1187627a | 1876 | nl_parse_begin(&s, 0); |
2feaa693 OZ |
1877 | nl_parse_route(&s, h); |
1878 | nl_parse_end(&s); | |
95616c82 OZ |
1879 | break; |
1880 | case RTM_NEWLINK: | |
1881 | case RTM_DELLINK: | |
1882 | DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1883 | if (kif_proto) |
1884 | nl_parse_link(h, 0); | |
95616c82 OZ |
1885 | break; |
1886 | case RTM_NEWADDR: | |
1887 | case RTM_DELADDR: | |
1888 | DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type); | |
1e4891e4 OZ |
1889 | if (kif_proto) |
1890 | nl_parse_addr(h, 0); | |
95616c82 OZ |
1891 | break; |
1892 | default: | |
1893 | DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type); | |
1894 | } | |
1895 | } | |
1896 | ||
1897 | static int | |
3e236955 | 1898 | nl_async_hook(sock *sk, uint size UNUSED) |
95616c82 OZ |
1899 | { |
1900 | struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE }; | |
1901 | struct sockaddr_nl sa; | |
31e9e101 ST |
1902 | struct msghdr m = { |
1903 | .msg_name = &sa, | |
1904 | .msg_namelen = sizeof(sa), | |
1905 | .msg_iov = &iov, | |
1906 | .msg_iovlen = 1, | |
1907 | }; | |
95616c82 OZ |
1908 | struct nlmsghdr *h; |
1909 | int x; | |
ae80a2de | 1910 | uint len; |
95616c82 OZ |
1911 | |
1912 | x = recvmsg(sk->fd, &m, 0); | |
1913 | if (x < 0) | |
1914 | { | |
1915 | if (errno == ENOBUFS) | |
1916 | { | |
1917 | /* | |
1918 | * Netlink reports some packets have been thrown away. | |
1919 | * One day we might react to it by asking for route table | |
1920 | * scan in near future. | |
1921 | */ | |
2c33da50 | 1922 | log(L_WARN "Kernel dropped some netlink messages, will resync on next scan."); |
95616c82 OZ |
1923 | return 1; /* More data are likely to be ready */ |
1924 | } | |
1925 | else if (errno != EWOULDBLOCK) | |
1926 | log(L_ERR "Netlink recvmsg: %m"); | |
1927 | return 0; | |
1928 | } | |
1929 | if (sa.nl_pid) /* It isn't from the kernel */ | |
1930 | { | |
1931 | DBG("Non-kernel packet\n"); | |
1932 | return 1; | |
1933 | } | |
1934 | h = (void *) nl_async_rx_buffer; | |
1935 | len = x; | |
1936 | if (m.msg_flags & MSG_TRUNC) | |
1937 | { | |
1938 | log(L_WARN "Netlink got truncated asynchronous message"); | |
1939 | return 1; | |
1940 | } | |
1941 | while (NLMSG_OK(h, len)) | |
1942 | { | |
1943 | nl_async_msg(h); | |
1944 | h = NLMSG_NEXT(h, len); | |
1945 | } | |
1946 | if (len) | |
1947 | log(L_WARN "nl_async_hook: Found packet remnant of size %d", len); | |
1948 | return 1; | |
1949 | } | |
1950 | ||
ccd2a3ed JMM |
1951 | static void |
1952 | nl_async_err_hook(sock *sk, int e UNUSED) | |
1953 | { | |
1954 | nl_async_hook(sk, 0); | |
1955 | } | |
1956 | ||
95616c82 OZ |
1957 | static void |
1958 | nl_open_async(void) | |
1959 | { | |
1960 | sock *sk; | |
1961 | struct sockaddr_nl sa; | |
1962 | int fd; | |
95616c82 | 1963 | |
f83ce94d | 1964 | if (nl_async_sk) |
95616c82 | 1965 | return; |
95616c82 OZ |
1966 | |
1967 | DBG("KRT: Opening async netlink socket\n"); | |
1968 | ||
1969 | fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
1970 | if (fd < 0) | |
1971 | { | |
1972 | log(L_ERR "Unable to open asynchronous rtnetlink socket: %m"); | |
1973 | return; | |
1974 | } | |
1975 | ||
1976 | bzero(&sa, sizeof(sa)); | |
1977 | sa.nl_family = AF_NETLINK; | |
29a64162 OZ |
1978 | sa.nl_groups = RTMGRP_LINK | |
1979 | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE | | |
1980 | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE; | |
1981 | ||
95616c82 OZ |
1982 | if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) |
1983 | { | |
1984 | log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m"); | |
f83ce94d | 1985 | close(fd); |
95616c82 OZ |
1986 | return; |
1987 | } | |
1988 | ||
f83ce94d OZ |
1989 | nl_async_rx_buffer = xmalloc(NL_RX_SIZE); |
1990 | ||
95616c82 OZ |
1991 | sk = nl_async_sk = sk_new(krt_pool); |
1992 | sk->type = SK_MAGIC; | |
1993 | sk->rx_hook = nl_async_hook; | |
ccd2a3ed | 1994 | sk->err_hook = nl_async_err_hook; |
95616c82 | 1995 | sk->fd = fd; |
05476c4d | 1996 | if (sk_open(sk) < 0) |
95616c82 | 1997 | bug("Netlink: sk_open failed"); |
95616c82 OZ |
1998 | } |
1999 | ||
9ddbfbdd | 2000 | |
95616c82 OZ |
2001 | /* |
2002 | * Interface to the UNIX krt module | |
2003 | */ | |
2004 | ||
95616c82 | 2005 | void |
9ddbfbdd JMM |
2006 | krt_sys_io_init(void) |
2007 | { | |
05d47bd5 | 2008 | nl_linpool = lp_new_default(krt_pool); |
9ddbfbdd JMM |
2009 | HASH_INIT(nl_table_map, krt_pool, 6); |
2010 | } | |
2011 | ||
2012 | int | |
c6964c30 | 2013 | krt_sys_start(struct krt_proto *p) |
95616c82 | 2014 | { |
29a64162 | 2015 | struct krt_proto *old = HASH_FIND(nl_table_map, RTH, p->af, krt_table_id(p)); |
9ddbfbdd JMM |
2016 | |
2017 | if (old) | |
2018 | { | |
2019 | log(L_ERR "%s: Kernel table %u already registered by %s", | |
2020 | p->p.name, krt_table_id(p), old->p.name); | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | HASH_INSERT2(nl_table_map, RTH, krt_pool, p); | |
c6964c30 OZ |
2025 | |
2026 | nl_open(); | |
2027 | nl_open_async(); | |
9ddbfbdd JMM |
2028 | |
2029 | return 1; | |
95616c82 OZ |
2030 | } |
2031 | ||
2032 | void | |
9ddbfbdd | 2033 | krt_sys_shutdown(struct krt_proto *p) |
95616c82 | 2034 | { |
9ddbfbdd | 2035 | HASH_REMOVE2(nl_table_map, RTH, krt_pool, p); |
95616c82 OZ |
2036 | } |
2037 | ||
2038 | int | |
2039 | krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o) | |
2040 | { | |
4adcb9df | 2041 | return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric); |
95616c82 OZ |
2042 | } |
2043 | ||
95616c82 OZ |
2044 | void |
2045 | krt_sys_init_config(struct krt_config *cf) | |
2046 | { | |
2047 | cf->sys.table_id = RT_TABLE_MAIN; | |
bff21441 | 2048 | cf->sys.metric = 32; |
95616c82 OZ |
2049 | } |
2050 | ||
2051 | void | |
2052 | krt_sys_copy_config(struct krt_config *d, struct krt_config *s) | |
2053 | { | |
2054 | d->sys.table_id = s->sys.table_id; | |
4adcb9df | 2055 | d->sys.metric = s->sys.metric; |
95616c82 OZ |
2056 | } |
2057 | ||
9fdf9d29 OZ |
2058 | static const char *krt_metrics_names[KRT_METRICS_MAX] = { |
2059 | NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss", | |
2060 | "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack" | |
2061 | }; | |
2062 | ||
2063 | static const char *krt_features_names[KRT_FEATURES_MAX] = { | |
2064 | "ecn", NULL, NULL, "allfrag" | |
2065 | }; | |
2066 | ||
2067 | int | |
2068 | krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED) | |
2069 | { | |
2070 | switch (a->id) | |
2071 | { | |
2072 | case EA_KRT_PREFSRC: | |
2073 | bsprintf(buf, "prefsrc"); | |
2074 | return GA_NAME; | |
2075 | ||
2076 | case EA_KRT_REALM: | |
2077 | bsprintf(buf, "realm"); | |
2078 | return GA_NAME; | |
2079 | ||
6e75d0d2 OZ |
2080 | case EA_KRT_SCOPE: |
2081 | bsprintf(buf, "scope"); | |
2082 | return GA_NAME; | |
2083 | ||
9fdf9d29 OZ |
2084 | case EA_KRT_LOCK: |
2085 | buf += bsprintf(buf, "lock:"); | |
2086 | ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX); | |
2087 | return GA_FULL; | |
2088 | ||
2089 | case EA_KRT_FEATURES: | |
2090 | buf += bsprintf(buf, "features:"); | |
2091 | ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX); | |
2092 | return GA_FULL; | |
2093 | ||
2094 | default:; | |
2095 | int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET; | |
2096 | if (id > 0 && id < KRT_METRICS_MAX) | |
2097 | { | |
2098 | bsprintf(buf, "%s", krt_metrics_names[id]); | |
2099 | return GA_NAME; | |
2100 | } | |
2101 | ||
2102 | return GA_UNKNOWN; | |
2103 | } | |
2104 | } | |
2105 | ||
95616c82 OZ |
2106 | |
2107 | ||
2108 | void | |
2109 | kif_sys_start(struct kif_proto *p UNUSED) | |
2110 | { | |
2111 | nl_open(); | |
2112 | nl_open_async(); | |
2113 | } | |
2114 | ||
2115 | void | |
2116 | kif_sys_shutdown(struct kif_proto *p UNUSED) | |
2117 | { | |
2118 | } | |
153f02da OZ |
2119 | |
2120 | int | |
2121 | kif_update_sysdep_addr(struct iface *i UNUSED) | |
2122 | { | |
2123 | return 0; | |
2124 | } |