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