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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 | #ifdef SIN6_LEN | |
93 | /* Calculate sin6_len value for netmask socket value. */ | |
94 | static int sin6_masklen(struct in6_addr mask) | |
95 | { | |
96 | struct sockaddr_in6 sin6; | |
97 | char *p, *lim; | |
98 | int len; | |
99 | ||
100 | if (IN6_IS_ADDR_UNSPECIFIED(&mask)) | |
101 | return sizeof(long); | |
102 | ||
103 | sin6.sin6_addr = mask; | |
104 | len = sizeof(struct sockaddr_in6); | |
105 | ||
106 | lim = (char *)&sin6.sin6_addr; | |
107 | p = lim + sizeof(sin6.sin6_addr); | |
108 | ||
109 | while (*--p == 0 && p >= lim) | |
110 | len--; | |
111 | ||
112 | return len; | |
113 | } | |
114 | #endif /* SIN6_LEN */ | |
115 | ||
116 | /* Interface between zebra message and rtm message. */ | |
117 | static int kernel_rtm(int cmd, const struct prefix *p, | |
118 | const struct nexthop_group *ng, uint32_t metric) | |
119 | ||
120 | { | |
121 | union sockunion sin_dest, sin_mask, sin_gate; | |
122 | #ifdef __OpenBSD__ | |
123 | struct sockaddr_mpls smpls; | |
124 | #endif | |
125 | union sockunion *smplsp = NULL; | |
126 | struct nexthop *nexthop; | |
127 | int nexthop_num = 0; | |
128 | ifindex_t ifindex = 0; | |
129 | bool gate = false; | |
130 | int error; | |
131 | char prefix_buf[PREFIX_STRLEN]; | |
132 | enum blackhole_type bh_type = BLACKHOLE_UNSPEC; | |
133 | ||
134 | if (IS_ZEBRA_DEBUG_RIB) | |
135 | prefix2str(p, prefix_buf, sizeof(prefix_buf)); | |
136 | ||
137 | /* | |
138 | * We only have the ability to ADD or DELETE at this point | |
139 | * in time. | |
140 | */ | |
141 | if (cmd != RTM_ADD && cmd != RTM_DELETE) { | |
142 | if (IS_ZEBRA_DEBUG_KERNEL) | |
143 | zlog_debug("%s: %s odd command %s for flags %d", | |
144 | __func__, prefix_buf, | |
145 | lookup_msg(rtm_type_str, cmd, NULL), | |
146 | nexthop->flags); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | memset(&sin_dest, 0, sizeof(sin_dest)); | |
151 | memset(&sin_gate, 0, sizeof(sin_gate)); | |
152 | memset(&sin_mask, 0, sizeof(sin_mask)); | |
153 | ||
154 | switch (p->family) { | |
155 | case AF_INET: | |
156 | sin_dest.sin.sin_family = AF_INET; | |
157 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
158 | sin_dest.sin.sin_len = sizeof(sin_dest); | |
159 | sin_gate.sin.sin_len = sizeof(sin_gate); | |
160 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
161 | sin_dest.sin.sin_addr = p->u.prefix4; | |
162 | sin_gate.sin.sin_family = AF_INET; | |
163 | break; | |
164 | case AF_INET6: | |
165 | sin_dest.sin6.sin6_family = AF_INET6; | |
166 | #ifdef SIN6_LEN | |
167 | sin_dest.sin6.sin6_len = sizeof(sin_dest); | |
168 | #endif /* SIN6_LEN */ | |
169 | sin_dest.sin6.sin6_addr = p->u.prefix6; | |
170 | sin_gate.sin6.sin6_family = AF_INET6; | |
171 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
172 | sin_gate.sin6.sin6_len = sizeof(sin_gate); | |
173 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
174 | break; | |
175 | } | |
176 | ||
177 | /* Make gateway. */ | |
178 | for (ALL_NEXTHOPS_PTR(ng, nexthop)) { | |
179 | /* | |
180 | * We only want to use the actual good nexthops | |
181 | */ | |
182 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE) || | |
183 | !CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
184 | continue; | |
185 | ||
186 | smplsp = NULL; | |
187 | gate = false; | |
188 | char gate_buf[INET_ADDRSTRLEN] = "NULL"; | |
189 | ||
190 | switch (nexthop->type) { | |
191 | case NEXTHOP_TYPE_IPV4: | |
192 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
193 | sin_gate.sin.sin_addr = nexthop->gate.ipv4; | |
194 | sin_gate.sin.sin_family = AF_INET; | |
195 | ifindex = nexthop->ifindex; | |
196 | gate = true; | |
197 | break; | |
198 | case NEXTHOP_TYPE_IPV6: | |
199 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
200 | sin_gate.sin6.sin6_addr = nexthop->gate.ipv6; | |
201 | sin_gate.sin6.sin6_family = AF_INET6; | |
202 | ifindex = nexthop->ifindex; | |
203 | /* Under kame set interface index to link local address */ | |
204 | #ifdef KAME | |
205 | ||
206 | #define SET_IN6_LINKLOCAL_IFINDEX(a, i) \ | |
207 | do { \ | |
208 | (a).s6_addr[2] = ((i) >> 8) & 0xff; \ | |
209 | (a).s6_addr[3] = (i)&0xff; \ | |
210 | } while (0) | |
211 | ||
212 | if (IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6.sin6_addr)) | |
213 | SET_IN6_LINKLOCAL_IFINDEX( | |
214 | sin_gate.sin6.sin6_addr, | |
215 | ifindex); | |
216 | #endif /* KAME */ | |
217 | ||
218 | gate = true; | |
219 | break; | |
220 | case NEXTHOP_TYPE_IFINDEX: | |
221 | ifindex = nexthop->ifindex; | |
222 | break; | |
223 | case NEXTHOP_TYPE_BLACKHOLE: | |
224 | bh_type = nexthop->bh_type; | |
225 | switch (p->family) { | |
226 | case AFI_IP: { | |
227 | struct in_addr loopback; | |
228 | loopback.s_addr = htonl(INADDR_LOOPBACK); | |
229 | sin_gate.sin.sin_addr = loopback; | |
230 | gate = true; | |
231 | } | |
232 | break; | |
233 | case AFI_IP6: | |
234 | break; | |
235 | } | |
236 | } | |
237 | ||
238 | switch (p->family) { | |
239 | case AF_INET: | |
240 | masklen2ip(p->prefixlen, &sin_mask.sin.sin_addr); | |
241 | sin_mask.sin.sin_family = AF_INET; | |
242 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
243 | sin_mask.sin.sin_len = sin_masklen( | |
244 | sin_mask.sin.sin_addr); | |
245 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
246 | break; | |
247 | case AF_INET6: | |
248 | masklen2ip6(p->prefixlen, &sin_mask.sin6.sin6_addr); | |
249 | sin_mask.sin6.sin6_family = AF_INET6; | |
250 | #ifdef SIN6_LEN | |
251 | sin_mask.sin6.sin6_len = sin6_masklen( | |
252 | sin_mask.sin6.sin6_addr); | |
253 | #endif /* SIN6_LEN */ | |
254 | break; | |
255 | } | |
256 | ||
257 | #ifdef __OpenBSD__ | |
258 | if (nexthop->nh_label | |
259 | && !kernel_rtm_add_labels(nexthop->nh_label, &smpls)) | |
260 | continue; | |
261 | smplsp = (union sockunion *)&smpls; | |
262 | #endif | |
263 | error = rtm_write(cmd, &sin_dest, &sin_mask, | |
264 | gate ? &sin_gate : NULL, smplsp, | |
265 | ifindex, bh_type, metric); | |
266 | ||
267 | if (IS_ZEBRA_DEBUG_KERNEL) { | |
268 | if (!gate) { | |
269 | zlog_debug("%s: %s: attention! gate not found for re", | |
270 | __func__, prefix_buf); | |
271 | } else | |
272 | inet_ntop(p->family == AFI_IP ? AF_INET | |
273 | : AF_INET6, | |
274 | &sin_gate.sin.sin_addr, | |
275 | gate_buf, INET_ADDRSTRLEN); | |
276 | } | |
277 | switch (error) { | |
278 | /* We only flag nexthops as being in FIB if | |
279 | * rtm_write() did its work. */ | |
280 | case ZEBRA_ERR_NOERROR: | |
281 | nexthop_num++; | |
282 | if (IS_ZEBRA_DEBUG_KERNEL) | |
283 | zlog_debug("%s: %s: successfully did NH %s", | |
284 | __func__, prefix_buf, gate_buf); | |
285 | if (cmd == RTM_ADD) | |
286 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB); | |
287 | break; | |
288 | ||
289 | /* The only valid case for this error is | |
290 | * kernel's failure to install a multipath | |
291 | * route, which is common for FreeBSD. This | |
292 | * should be ignored silently, but logged as an error | |
293 | * otherwise. | |
294 | */ | |
295 | case ZEBRA_ERR_RTEXIST: | |
296 | if (cmd != RTM_ADD) | |
297 | flog_err(EC_LIB_SYSTEM_CALL, | |
298 | "%s: rtm_write() returned %d for command %d", | |
299 | __func__, error, cmd); | |
300 | continue; | |
301 | ||
302 | /* Note any unexpected status returns */ | |
303 | default: | |
304 | flog_err(EC_LIB_SYSTEM_CALL, | |
305 | "%s: %s: rtm_write() unexpectedly returned %d for command %s", | |
306 | __func__, | |
307 | prefix2str(p, prefix_buf, | |
308 | sizeof(prefix_buf)), | |
309 | error, lookup_msg(rtm_type_str, cmd, NULL)); | |
310 | break; | |
311 | } | |
312 | } /* for (ALL_NEXTHOPS(...))*/ | |
313 | ||
314 | /* If there was no useful nexthop, then complain. */ | |
315 | if (nexthop_num == 0) { | |
316 | if (IS_ZEBRA_DEBUG_KERNEL) | |
317 | zlog_debug("%s: No useful nexthops were found in RIB prefix %s", | |
318 | __func__, prefix2str(p, prefix_buf, | |
319 | sizeof(prefix_buf))); | |
320 | return 1; | |
321 | } | |
322 | ||
323 | return 0; /*XXX*/ | |
324 | } | |
325 | ||
326 | /* | |
327 | * Update or delete a prefix from the kernel, | |
328 | * using info from a dataplane context struct. | |
329 | */ | |
330 | enum zebra_dplane_result kernel_route_update(struct zebra_dplane_ctx *ctx) | |
331 | { | |
332 | enum zebra_dplane_result res = ZEBRA_DPLANE_REQUEST_SUCCESS; | |
333 | ||
334 | if (dplane_ctx_get_src(ctx) != NULL) { | |
335 | zlog_err("route add: IPv6 sourcedest routes unsupported!"); | |
336 | res = ZEBRA_DPLANE_REQUEST_FAILURE; | |
337 | goto done; | |
338 | } | |
339 | ||
340 | frr_elevate_privs(&zserv_privs) { | |
341 | ||
342 | if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_DELETE) | |
343 | kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx), | |
344 | dplane_ctx_get_ng(ctx), | |
345 | dplane_ctx_get_metric(ctx)); | |
346 | else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_INSTALL) | |
347 | kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx), | |
348 | dplane_ctx_get_ng(ctx), | |
349 | dplane_ctx_get_metric(ctx)); | |
350 | else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_UPDATE) { | |
351 | /* Must do delete and add separately - | |
352 | * no update available | |
353 | */ | |
354 | kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx), | |
355 | dplane_ctx_get_old_ng(ctx), | |
356 | dplane_ctx_get_old_metric(ctx)); | |
357 | ||
358 | kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx), | |
359 | dplane_ctx_get_ng(ctx), | |
360 | dplane_ctx_get_metric(ctx)); | |
361 | } else { | |
362 | zlog_err("Invalid routing socket update op %s (%u)", | |
363 | dplane_op2str(dplane_ctx_get_op(ctx)), | |
364 | dplane_ctx_get_op(ctx)); | |
365 | res = ZEBRA_DPLANE_REQUEST_FAILURE; | |
366 | } | |
367 | } /* Elevated privs */ | |
368 | ||
369 | done: | |
370 | ||
371 | return res; | |
372 | } | |
373 | ||
374 | int kernel_neigh_update(int add, int ifindex, uint32_t addr, char *lla, | |
375 | int llalen, ns_id_t ns_id) | |
376 | { | |
377 | /* TODO */ | |
378 | return 0; | |
379 | } | |
380 | ||
381 | extern int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *mroute) | |
382 | { | |
383 | return 0; | |
384 | } | |
385 | ||
386 | int kernel_add_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) | |
387 | { | |
388 | return 0; | |
389 | } | |
390 | ||
391 | int kernel_del_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) | |
392 | { | |
393 | return 0; | |
394 | } | |
395 | ||
396 | int kernel_add_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, | |
397 | struct in_addr vtep_ip, bool sticky) | |
398 | { | |
399 | return 0; | |
400 | } | |
401 | ||
402 | int kernel_del_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, | |
403 | struct in_addr vtep_ip) | |
404 | { | |
405 | return 0; | |
406 | } | |
407 | ||
408 | int kernel_add_neigh(struct interface *ifp, struct ipaddr *ip, | |
409 | struct ethaddr *mac, uint8_t flags) | |
410 | { | |
411 | return 0; | |
412 | } | |
413 | ||
414 | int kernel_del_neigh(struct interface *ifp, struct ipaddr *ip) | |
415 | { | |
416 | return 0; | |
417 | } | |
418 | ||
419 | extern int kernel_interface_set_master(struct interface *master, | |
420 | struct interface *slave) | |
421 | { | |
422 | return 0; | |
423 | } | |
424 | ||
425 | uint32_t kernel_get_speed(struct interface *ifp) | |
426 | { | |
427 | return ifp->speed; | |
428 | } | |
429 | ||
430 | #endif /* !HAVE_NETLINK */ |