]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Kernel routing table updates by routing socket. | |
3 | * Copyright (C) 1997, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #ifndef HAVE_NETLINK | |
25 | ||
26 | #ifdef __OpenBSD__ | |
27 | #include <netmpls/mpls.h> | |
28 | #endif | |
29 | ||
30 | #include "if.h" | |
31 | #include "prefix.h" | |
32 | #include "sockunion.h" | |
33 | #include "log.h" | |
34 | #include "privs.h" | |
35 | #include "vxlan.h" | |
36 | #include "lib_errors.h" | |
37 | ||
38 | #include "zebra/debug.h" | |
39 | #include "zebra/rib.h" | |
40 | #include "zebra/rt.h" | |
41 | #include "zebra/kernel_socket.h" | |
42 | #include "zebra/zebra_mpls.h" | |
43 | #include "zebra/zebra_errors.h" | |
44 | ||
45 | extern struct zebra_privs_t zserv_privs; | |
46 | ||
47 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
48 | /* Adjust netmask socket length. Return value is a adjusted sin_len | |
49 | value. */ | |
50 | static int sin_masklen(struct in_addr mask) | |
51 | { | |
52 | char *p, *lim; | |
53 | int len; | |
54 | struct sockaddr_in sin; | |
55 | ||
56 | if (mask.s_addr == 0) | |
57 | return sizeof(long); | |
58 | ||
59 | sin.sin_addr = mask; | |
60 | len = sizeof(struct sockaddr_in); | |
61 | ||
62 | lim = (char *)&sin.sin_addr; | |
63 | p = lim + sizeof(sin.sin_addr); | |
64 | ||
65 | while (*--p == 0 && p >= lim) | |
66 | len--; | |
67 | return len; | |
68 | } | |
69 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
70 | ||
71 | #ifdef __OpenBSD__ | |
72 | static int kernel_rtm_add_labels(struct mpls_label_stack *nh_label, | |
73 | struct sockaddr_mpls *smpls) | |
74 | { | |
75 | if (nh_label->num_labels > 1) { | |
76 | flog_warn(EC_ZEBRA_MAX_LABELS_PUSH, | |
77 | "%s: can't push %u labels at " | |
78 | "once (maximum is 1)", | |
79 | __func__, nh_label->num_labels); | |
80 | return -1; | |
81 | } | |
82 | ||
83 | memset(smpls, 0, sizeof(*smpls)); | |
84 | smpls->smpls_len = sizeof(*smpls); | |
85 | smpls->smpls_family = AF_MPLS; | |
86 | smpls->smpls_label = htonl(nh_label->label[0] << MPLS_LABEL_OFFSET); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | #endif | |
91 | ||
92 | /* Interface between zebra message and rtm message. */ | |
93 | static int kernel_rtm_ipv4(int cmd, const struct prefix *p, | |
94 | const struct nexthop_group *ng, uint32_t metric) | |
95 | ||
96 | { | |
97 | struct sockaddr_in *mask = NULL; | |
98 | struct sockaddr_in sin_dest, sin_mask, sin_gate; | |
99 | #ifdef __OpenBSD__ | |
100 | struct sockaddr_mpls smpls; | |
101 | #endif | |
102 | union sockunion *smplsp = NULL; | |
103 | struct nexthop *nexthop; | |
104 | int nexthop_num = 0; | |
105 | ifindex_t ifindex = 0; | |
106 | int gate = 0; | |
107 | int error; | |
108 | char prefix_buf[PREFIX_STRLEN]; | |
109 | enum blackhole_type bh_type = BLACKHOLE_UNSPEC; | |
110 | ||
111 | if (IS_ZEBRA_DEBUG_RIB) | |
112 | prefix2str(p, prefix_buf, sizeof(prefix_buf)); | |
113 | memset(&sin_dest, 0, sizeof(struct sockaddr_in)); | |
114 | sin_dest.sin_family = AF_INET; | |
115 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
116 | sin_dest.sin_len = sizeof(struct sockaddr_in); | |
117 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
118 | sin_dest.sin_addr = p->u.prefix4; | |
119 | ||
120 | memset(&sin_mask, 0, sizeof(struct sockaddr_in)); | |
121 | ||
122 | memset(&sin_gate, 0, sizeof(struct sockaddr_in)); | |
123 | sin_gate.sin_family = AF_INET; | |
124 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
125 | sin_gate.sin_len = sizeof(struct sockaddr_in); | |
126 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
127 | ||
128 | /* Make gateway. */ | |
129 | for (ALL_NEXTHOPS_PTR(ng, nexthop)) { | |
130 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
131 | continue; | |
132 | ||
133 | gate = 0; | |
134 | char gate_buf[INET_ADDRSTRLEN] = "NULL"; | |
135 | ||
136 | /* | |
137 | * XXX We need to refrain from kernel operations in some cases, | |
138 | * but this if statement seems overly cautious - what about | |
139 | * other than ADD and DELETE? | |
140 | */ | |
141 | if ((cmd == RTM_ADD && NEXTHOP_IS_ACTIVE(nexthop->flags)) | |
142 | || (cmd == RTM_DELETE)) { | |
143 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
144 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) { | |
145 | sin_gate.sin_addr = nexthop->gate.ipv4; | |
146 | gate = 1; | |
147 | } | |
148 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
149 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
150 | ifindex = nexthop->ifindex; | |
151 | if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) { | |
152 | struct in_addr loopback; | |
153 | loopback.s_addr = htonl(INADDR_LOOPBACK); | |
154 | sin_gate.sin_addr = loopback; | |
155 | bh_type = nexthop->bh_type; | |
156 | gate = 1; | |
157 | } | |
158 | ||
159 | if (gate && p->prefixlen == 32) | |
160 | mask = NULL; | |
161 | else { | |
162 | masklen2ip(p->prefixlen, &sin_mask.sin_addr); | |
163 | sin_mask.sin_family = AF_INET; | |
164 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
165 | sin_mask.sin_len = | |
166 | sin_masklen(sin_mask.sin_addr); | |
167 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
168 | mask = &sin_mask; | |
169 | } | |
170 | ||
171 | #ifdef __OpenBSD__ | |
172 | if (nexthop->nh_label | |
173 | && !kernel_rtm_add_labels(nexthop->nh_label, | |
174 | &smpls)) | |
175 | continue; | |
176 | smplsp = (union sockunion *)&smpls; | |
177 | #endif | |
178 | ||
179 | error = rtm_write(cmd, (union sockunion *)&sin_dest, | |
180 | (union sockunion *)mask, | |
181 | gate ? (union sockunion *)&sin_gate | |
182 | : NULL, | |
183 | smplsp, ifindex, bh_type, metric); | |
184 | ||
185 | if (IS_ZEBRA_DEBUG_KERNEL) { | |
186 | if (!gate) { | |
187 | zlog_debug( | |
188 | "%s: %s: attention! gate not found for re", | |
189 | __func__, prefix_buf); | |
190 | } else | |
191 | inet_ntop(AF_INET, &sin_gate.sin_addr, | |
192 | gate_buf, INET_ADDRSTRLEN); | |
193 | } | |
194 | ||
195 | switch (error) { | |
196 | /* We only flag nexthops as being in FIB if rtm_write() | |
197 | * did its work. */ | |
198 | case ZEBRA_ERR_NOERROR: | |
199 | nexthop_num++; | |
200 | if (IS_ZEBRA_DEBUG_KERNEL) | |
201 | zlog_debug( | |
202 | "%s: %s: successfully did NH %s", | |
203 | __func__, prefix_buf, gate_buf); | |
204 | ||
205 | if (cmd == RTM_ADD) | |
206 | SET_FLAG(nexthop->flags, | |
207 | NEXTHOP_FLAG_FIB); | |
208 | ||
209 | break; | |
210 | ||
211 | /* The only valid case for this error is kernel's | |
212 | * failure to install | |
213 | * a multipath route, which is common for FreeBSD. This | |
214 | * should be | |
215 | * ignored silently, but logged as an error otherwise. | |
216 | */ | |
217 | case ZEBRA_ERR_RTEXIST: | |
218 | if (cmd != RTM_ADD) | |
219 | flog_err( | |
220 | EC_LIB_SYSTEM_CALL, | |
221 | "%s: rtm_write() returned %d for command %d", | |
222 | __func__, error, cmd); | |
223 | continue; | |
224 | ||
225 | /* Note any unexpected status returns */ | |
226 | default: | |
227 | flog_err( | |
228 | EC_LIB_SYSTEM_CALL, | |
229 | "%s: %s: rtm_write() unexpectedly returned %d for command %s", | |
230 | __func__, | |
231 | prefix2str(p, prefix_buf, | |
232 | sizeof(prefix_buf)), | |
233 | error, | |
234 | lookup_msg(rtm_type_str, cmd, NULL)); | |
235 | break; | |
236 | } | |
237 | } /* if (cmd and flags make sense) */ | |
238 | else if (IS_ZEBRA_DEBUG_KERNEL) | |
239 | zlog_debug("%s: odd command %s for flags %d", __func__, | |
240 | lookup_msg(rtm_type_str, cmd, NULL), | |
241 | nexthop->flags); | |
242 | } /* for (ALL_NEXTHOPS(...))*/ | |
243 | ||
244 | /* If there was no useful nexthop, then complain. */ | |
245 | if (nexthop_num == 0) { | |
246 | if (IS_ZEBRA_DEBUG_KERNEL) | |
247 | zlog_debug("%s: No useful nexthops were found in RIB prefix %s", | |
248 | __func__, prefix2str(p, prefix_buf, | |
249 | sizeof(prefix_buf))); | |
250 | return 1; | |
251 | } | |
252 | ||
253 | return 0; /*XXX*/ | |
254 | } | |
255 | ||
256 | #ifdef SIN6_LEN | |
257 | /* Calculate sin6_len value for netmask socket value. */ | |
258 | static int sin6_masklen(struct in6_addr mask) | |
259 | { | |
260 | struct sockaddr_in6 sin6; | |
261 | char *p, *lim; | |
262 | int len; | |
263 | ||
264 | if (IN6_IS_ADDR_UNSPECIFIED(&mask)) | |
265 | return sizeof(long); | |
266 | ||
267 | sin6.sin6_addr = mask; | |
268 | len = sizeof(struct sockaddr_in6); | |
269 | ||
270 | lim = (char *)&sin6.sin6_addr; | |
271 | p = lim + sizeof(sin6.sin6_addr); | |
272 | ||
273 | while (*--p == 0 && p >= lim) | |
274 | len--; | |
275 | ||
276 | return len; | |
277 | } | |
278 | #endif /* SIN6_LEN */ | |
279 | ||
280 | /* Interface between zebra message and rtm message. */ | |
281 | static int kernel_rtm_ipv6(int cmd, const struct prefix *p, | |
282 | const struct nexthop_group *ng, uint32_t metric) | |
283 | { | |
284 | struct sockaddr_in6 *mask; | |
285 | struct sockaddr_in6 sin_dest, sin_mask, sin_gate; | |
286 | #ifdef __OpenBSD__ | |
287 | struct sockaddr_mpls smpls; | |
288 | #endif | |
289 | union sockunion *smplsp = NULL; | |
290 | struct nexthop *nexthop; | |
291 | int nexthop_num = 0; | |
292 | ifindex_t ifindex = 0; | |
293 | int gate = 0; | |
294 | int error; | |
295 | enum blackhole_type bh_type = BLACKHOLE_UNSPEC; | |
296 | ||
297 | memset(&sin_dest, 0, sizeof(struct sockaddr_in6)); | |
298 | sin_dest.sin6_family = AF_INET6; | |
299 | #ifdef SIN6_LEN | |
300 | sin_dest.sin6_len = sizeof(struct sockaddr_in6); | |
301 | #endif /* SIN6_LEN */ | |
302 | sin_dest.sin6_addr = p->u.prefix6; | |
303 | ||
304 | memset(&sin_mask, 0, sizeof(struct sockaddr_in6)); | |
305 | ||
306 | memset(&sin_gate, 0, sizeof(struct sockaddr_in6)); | |
307 | sin_gate.sin6_family = AF_INET6; | |
308 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
309 | sin_gate.sin6_len = sizeof(struct sockaddr_in6); | |
310 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
311 | ||
312 | /* Make gateway. */ | |
313 | for (ALL_NEXTHOPS_PTR(ng, nexthop)) { | |
314 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
315 | continue; | |
316 | ||
317 | gate = 0; | |
318 | ||
319 | if ((cmd == RTM_ADD && NEXTHOP_IS_ACTIVE(nexthop->flags)) | |
320 | || (cmd == RTM_DELETE)) { | |
321 | if (nexthop->type == NEXTHOP_TYPE_IPV6 | |
322 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) { | |
323 | sin_gate.sin6_addr = nexthop->gate.ipv6; | |
324 | gate = 1; | |
325 | } | |
326 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
327 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
328 | ifindex = nexthop->ifindex; | |
329 | ||
330 | if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) | |
331 | bh_type = nexthop->bh_type; | |
332 | } | |
333 | ||
334 | /* Under kame set interface index to link local address. */ | |
335 | #ifdef KAME | |
336 | ||
337 | #define SET_IN6_LINKLOCAL_IFINDEX(a, i) \ | |
338 | do { \ | |
339 | (a).s6_addr[2] = ((i) >> 8) & 0xff; \ | |
340 | (a).s6_addr[3] = (i)&0xff; \ | |
341 | } while (0) | |
342 | ||
343 | if (gate && IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6_addr)) | |
344 | SET_IN6_LINKLOCAL_IFINDEX(sin_gate.sin6_addr, ifindex); | |
345 | #endif /* KAME */ | |
346 | ||
347 | if (gate && p->prefixlen == 128) | |
348 | mask = NULL; | |
349 | else { | |
350 | masklen2ip6(p->prefixlen, &sin_mask.sin6_addr); | |
351 | sin_mask.sin6_family = AF_INET6; | |
352 | #ifdef SIN6_LEN | |
353 | sin_mask.sin6_len = sin6_masklen(sin_mask.sin6_addr); | |
354 | #endif /* SIN6_LEN */ | |
355 | mask = &sin_mask; | |
356 | } | |
357 | ||
358 | #ifdef __OpenBSD__ | |
359 | if (nexthop->nh_label | |
360 | && !kernel_rtm_add_labels(nexthop->nh_label, &smpls)) | |
361 | continue; | |
362 | smplsp = (union sockunion *)&smpls; | |
363 | #endif | |
364 | ||
365 | error = rtm_write(cmd, (union sockunion *)&sin_dest, | |
366 | (union sockunion *)mask, | |
367 | gate ? (union sockunion *)&sin_gate : NULL, | |
368 | smplsp, ifindex, bh_type, metric); | |
369 | ||
370 | /* Update installed nexthop info on success */ | |
371 | if ((cmd == RTM_ADD) && (error == ZEBRA_ERR_NOERROR)) | |
372 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB); | |
373 | ||
374 | nexthop_num++; | |
375 | } | |
376 | ||
377 | /* If there is no useful nexthop then return. */ | |
378 | if (nexthop_num == 0) { | |
379 | if (IS_ZEBRA_DEBUG_KERNEL) | |
380 | zlog_debug("kernel_rtm_ipv6(): No useful nexthop."); | |
381 | return 1; | |
382 | } | |
383 | ||
384 | return 0; /*XXX*/ | |
385 | } | |
386 | ||
387 | static int kernel_rtm(int cmd, const struct prefix *p, | |
388 | const struct nexthop_group *ng, uint32_t metric) | |
389 | { | |
390 | switch (PREFIX_FAMILY(p)) { | |
391 | case AF_INET: | |
392 | return kernel_rtm_ipv4(cmd, p, ng, metric); | |
393 | case AF_INET6: | |
394 | return kernel_rtm_ipv6(cmd, p, ng, metric); | |
395 | } | |
396 | return 0; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Update or delete a prefix from the kernel, | |
401 | * using info from a dataplane context struct. | |
402 | */ | |
403 | enum zebra_dplane_result kernel_route_update(struct zebra_dplane_ctx *ctx) | |
404 | { | |
405 | enum zebra_dplane_result res = ZEBRA_DPLANE_REQUEST_SUCCESS; | |
406 | ||
407 | if (dplane_ctx_get_src(ctx) != NULL) { | |
408 | zlog_err("route add: IPv6 sourcedest routes unsupported!"); | |
409 | res = ZEBRA_DPLANE_REQUEST_FAILURE; | |
410 | goto done; | |
411 | } | |
412 | ||
413 | frr_elevate_privs(&zserv_privs) { | |
414 | ||
415 | if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_DELETE) | |
416 | kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx), | |
417 | dplane_ctx_get_ng(ctx), | |
418 | dplane_ctx_get_metric(ctx)); | |
419 | else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_INSTALL) | |
420 | kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx), | |
421 | dplane_ctx_get_ng(ctx), | |
422 | dplane_ctx_get_metric(ctx)); | |
423 | else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_UPDATE) { | |
424 | /* Must do delete and add separately - | |
425 | * no update available | |
426 | */ | |
427 | kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx), | |
428 | dplane_ctx_get_old_ng(ctx), | |
429 | dplane_ctx_get_old_metric(ctx)); | |
430 | ||
431 | kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx), | |
432 | dplane_ctx_get_ng(ctx), | |
433 | dplane_ctx_get_metric(ctx)); | |
434 | } else { | |
435 | zlog_err("Invalid routing socket update op %s (%u)", | |
436 | dplane_op2str(dplane_ctx_get_op(ctx)), | |
437 | dplane_ctx_get_op(ctx)); | |
438 | res = ZEBRA_DPLANE_REQUEST_FAILURE; | |
439 | } | |
440 | } /* Elevated privs */ | |
441 | ||
442 | done: | |
443 | ||
444 | return res; | |
445 | } | |
446 | ||
447 | int kernel_neigh_update(int add, int ifindex, uint32_t addr, char *lla, | |
448 | int llalen, ns_id_t ns_id) | |
449 | { | |
450 | /* TODO */ | |
451 | return 0; | |
452 | } | |
453 | ||
454 | extern int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *mroute) | |
455 | { | |
456 | return 0; | |
457 | } | |
458 | ||
459 | int kernel_add_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) | |
460 | { | |
461 | return 0; | |
462 | } | |
463 | ||
464 | int kernel_del_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) | |
465 | { | |
466 | return 0; | |
467 | } | |
468 | ||
469 | int kernel_add_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, | |
470 | struct in_addr vtep_ip, bool sticky) | |
471 | { | |
472 | return 0; | |
473 | } | |
474 | ||
475 | int kernel_del_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, | |
476 | struct in_addr vtep_ip) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | int kernel_add_neigh(struct interface *ifp, struct ipaddr *ip, | |
482 | struct ethaddr *mac, uint8_t flags) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | int kernel_del_neigh(struct interface *ifp, struct ipaddr *ip) | |
488 | { | |
489 | return 0; | |
490 | } | |
491 | ||
492 | extern int kernel_interface_set_master(struct interface *master, | |
493 | struct interface *slave) | |
494 | { | |
495 | return 0; | |
496 | } | |
497 | ||
498 | uint32_t kernel_get_speed(struct interface *ifp) | |
499 | { | |
500 | return ifp->speed; | |
501 | } | |
502 | ||
503 | #endif /* !HAVE_NETLINK */ |