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718e3744 | 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 | * | |
896014f4 DL |
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 | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
ddfeb486 DL |
23 | |
24 | #ifndef HAVE_NETLINK | |
25 | ||
fe6c7157 | 26 | #ifdef __OpenBSD__ |
d3e2c74a RW |
27 | #include <netmpls/mpls.h> |
28 | #endif | |
718e3744 | 29 | |
30 | #include "if.h" | |
31 | #include "prefix.h" | |
32 | #include "sockunion.h" | |
33 | #include "log.h" | |
edd7c245 | 34 | #include "privs.h" |
13d60d35 | 35 | #include "vxlan.h" |
718e3744 | 36 | |
37 | #include "zebra/debug.h" | |
38 | #include "zebra/rib.h" | |
6621ca86 | 39 | #include "zebra/rt.h" |
dc95824a | 40 | #include "zebra/kernel_socket.h" |
d3e2c74a | 41 | #include "zebra/zebra_mpls.h" |
718e3744 | 42 | |
edd7c245 | 43 | extern struct zebra_privs_t zserv_privs; |
44 | ||
6621ca86 | 45 | /* kernel socket export */ |
d62a17ae | 46 | extern int rtm_write(int message, union sockunion *dest, union sockunion *mask, |
47 | union sockunion *gate, union sockunion *mpls, | |
48 | unsigned int index, int zebra_flags, int metric); | |
718e3744 | 49 | |
746c4f02 | 50 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 51 | /* Adjust netmask socket length. Return value is a adjusted sin_len |
52 | value. */ | |
d62a17ae | 53 | static int sin_masklen(struct in_addr mask) |
718e3744 | 54 | { |
d62a17ae | 55 | char *p, *lim; |
56 | int len; | |
57 | struct sockaddr_in sin; | |
718e3744 | 58 | |
d62a17ae | 59 | if (mask.s_addr == 0) |
60 | return sizeof(long); | |
718e3744 | 61 | |
d62a17ae | 62 | sin.sin_addr = mask; |
63 | len = sizeof(struct sockaddr_in); | |
718e3744 | 64 | |
d62a17ae | 65 | lim = (char *)&sin.sin_addr; |
66 | p = lim + sizeof(sin.sin_addr); | |
718e3744 | 67 | |
d62a17ae | 68 | while (*--p == 0 && p >= lim) |
69 | len--; | |
70 | return len; | |
718e3744 | 71 | } |
746c4f02 | 72 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 73 | |
74 | /* Interface between zebra message and rtm message. */ | |
d62a17ae | 75 | static int kernel_rtm_ipv4(int cmd, struct prefix *p, struct route_entry *re) |
718e3744 | 76 | |
77 | { | |
d62a17ae | 78 | struct sockaddr_in *mask = NULL; |
79 | struct sockaddr_in sin_dest, sin_mask, sin_gate; | |
fe6c7157 | 80 | #ifdef __OpenBSD__ |
d62a17ae | 81 | struct sockaddr_mpls smpls; |
d3e2c74a | 82 | #endif |
d62a17ae | 83 | union sockunion *smplsp = NULL; |
84 | struct nexthop *nexthop; | |
85 | int nexthop_num = 0; | |
86 | ifindex_t ifindex = 0; | |
87 | int gate = 0; | |
88 | int error; | |
89 | char prefix_buf[PREFIX_STRLEN]; | |
90 | ||
91 | if (IS_ZEBRA_DEBUG_RIB) | |
92 | prefix2str(p, prefix_buf, sizeof(prefix_buf)); | |
93 | memset(&sin_dest, 0, sizeof(struct sockaddr_in)); | |
94 | sin_dest.sin_family = AF_INET; | |
6f0e3f6e | 95 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 96 | sin_dest.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 97 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 98 | sin_dest.sin_addr = p->u.prefix4; |
718e3744 | 99 | |
d62a17ae | 100 | memset(&sin_mask, 0, sizeof(struct sockaddr_in)); |
718e3744 | 101 | |
d62a17ae | 102 | memset(&sin_gate, 0, sizeof(struct sockaddr_in)); |
103 | sin_gate.sin_family = AF_INET; | |
6f0e3f6e | 104 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 105 | sin_gate.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 106 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 107 | |
d62a17ae | 108 | /* Make gateway. */ |
109 | for (ALL_NEXTHOPS(re->nexthop, nexthop)) { | |
110 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
111 | continue; | |
112 | ||
113 | gate = 0; | |
114 | char gate_buf[INET_ADDRSTRLEN] = "NULL"; | |
115 | ||
116 | /* | |
117 | * XXX We need to refrain from kernel operations in some cases, | |
118 | * but this if statement seems overly cautious - what about | |
119 | * other than ADD and DELETE? | |
120 | */ | |
121 | if ((cmd == RTM_ADD | |
122 | && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
123 | || (cmd == RTM_DELETE | |
124 | && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB))) { | |
125 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
126 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) { | |
127 | sin_gate.sin_addr = nexthop->gate.ipv4; | |
128 | gate = 1; | |
129 | } | |
130 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
131 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
132 | ifindex = nexthop->ifindex; | |
133 | if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) { | |
134 | struct in_addr loopback; | |
135 | loopback.s_addr = htonl(INADDR_LOOPBACK); | |
136 | sin_gate.sin_addr = loopback; | |
137 | gate = 1; | |
138 | } | |
139 | ||
140 | if (gate && p->prefixlen == 32) | |
141 | mask = NULL; | |
142 | else { | |
143 | masklen2ip(p->prefixlen, &sin_mask.sin_addr); | |
144 | sin_mask.sin_family = AF_INET; | |
6f0e3f6e | 145 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 146 | sin_mask.sin_len = |
147 | sin_masklen(sin_mask.sin_addr); | |
6f0e3f6e | 148 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 149 | mask = &sin_mask; |
150 | } | |
718e3744 | 151 | |
fe6c7157 | 152 | #ifdef __OpenBSD__ |
d62a17ae | 153 | if (nexthop->nh_label) { |
154 | memset(&smpls, 0, sizeof(smpls)); | |
155 | smpls.smpls_len = sizeof(smpls); | |
156 | smpls.smpls_family = AF_MPLS; | |
157 | smpls.smpls_label = | |
158 | htonl(nexthop->nh_label->label[0] | |
159 | << MPLS_LABEL_OFFSET); | |
160 | smplsp = (union sockunion *)&smpls; | |
161 | } | |
d3e2c74a RW |
162 | #endif |
163 | ||
d62a17ae | 164 | error = rtm_write( |
165 | cmd, (union sockunion *)&sin_dest, | |
166 | (union sockunion *)mask, | |
167 | gate ? (union sockunion *)&sin_gate : NULL, | |
168 | smplsp, ifindex, re->flags, re->metric); | |
169 | ||
170 | if (IS_ZEBRA_DEBUG_RIB) { | |
171 | if (!gate) { | |
172 | zlog_debug( | |
173 | "%s: %s: attention! gate not found for re %p", | |
174 | __func__, prefix_buf, re); | |
175 | route_entry_dump(p, NULL, re); | |
176 | } else | |
177 | inet_ntop(AF_INET, &sin_gate.sin_addr, | |
178 | gate_buf, INET_ADDRSTRLEN); | |
179 | } | |
180 | ||
181 | switch (error) { | |
182 | /* We only flag nexthops as being in FIB if rtm_write() | |
183 | * did its work. */ | |
184 | case ZEBRA_ERR_NOERROR: | |
185 | nexthop_num++; | |
186 | if (IS_ZEBRA_DEBUG_RIB) | |
187 | zlog_debug( | |
188 | "%s: %s: successfully did NH %s", | |
189 | __func__, prefix_buf, gate_buf); | |
190 | if (cmd == RTM_ADD) | |
191 | SET_FLAG(nexthop->flags, | |
192 | NEXTHOP_FLAG_FIB); | |
193 | break; | |
194 | ||
195 | /* The only valid case for this error is kernel's | |
196 | * failure to install | |
197 | * a multipath route, which is common for FreeBSD. This | |
198 | * should be | |
199 | * ignored silently, but logged as an error otherwise. | |
200 | */ | |
201 | case ZEBRA_ERR_RTEXIST: | |
202 | if (cmd != RTM_ADD) | |
203 | zlog_err( | |
204 | "%s: rtm_write() returned %d for command %d", | |
205 | __func__, error, cmd); | |
206 | continue; | |
207 | break; | |
208 | ||
209 | /* Given that our NEXTHOP_FLAG_FIB matches real kernel | |
210 | * FIB, it isn't | |
211 | * normal to get any other messages in ANY case. | |
212 | */ | |
213 | case ZEBRA_ERR_RTNOEXIST: | |
214 | case ZEBRA_ERR_RTUNREACH: | |
215 | default: | |
216 | zlog_err( | |
217 | "%s: %s: rtm_write() unexpectedly returned %d for command %s", | |
218 | __func__, | |
219 | prefix2str(p, prefix_buf, | |
220 | sizeof(prefix_buf)), | |
221 | error, | |
222 | lookup_msg(rtm_type_str, cmd, NULL)); | |
223 | break; | |
224 | } | |
225 | } /* if (cmd and flags make sense) */ | |
226 | else if (IS_ZEBRA_DEBUG_RIB) | |
227 | zlog_debug("%s: odd command %s for flags %d", __func__, | |
228 | lookup_msg(rtm_type_str, cmd, NULL), | |
229 | nexthop->flags); | |
230 | } /* for (ALL_NEXTHOPS(...))*/ | |
231 | ||
232 | /* If there was no useful nexthop, then complain. */ | |
233 | if (nexthop_num == 0 && IS_ZEBRA_DEBUG_KERNEL) | |
234 | zlog_debug("%s: No useful nexthops were found in RIB entry %p", | |
235 | __func__, re); | |
236 | ||
237 | return 0; /*XXX*/ | |
718e3744 | 238 | } |
239 | ||
746c4f02 | 240 | #ifdef SIN6_LEN |
718e3744 | 241 | /* Calculate sin6_len value for netmask socket value. */ |
d62a17ae | 242 | static int sin6_masklen(struct in6_addr mask) |
718e3744 | 243 | { |
d62a17ae | 244 | struct sockaddr_in6 sin6; |
245 | char *p, *lim; | |
246 | int len; | |
718e3744 | 247 | |
d62a17ae | 248 | if (IN6_IS_ADDR_UNSPECIFIED(&mask)) |
249 | return sizeof(long); | |
718e3744 | 250 | |
d62a17ae | 251 | sin6.sin6_addr = mask; |
252 | len = sizeof(struct sockaddr_in6); | |
718e3744 | 253 | |
d62a17ae | 254 | lim = (char *)&sin6.sin6_addr; |
255 | p = lim + sizeof(sin6.sin6_addr); | |
718e3744 | 256 | |
d62a17ae | 257 | while (*--p == 0 && p >= lim) |
258 | len--; | |
718e3744 | 259 | |
d62a17ae | 260 | return len; |
718e3744 | 261 | } |
746c4f02 | 262 | #endif /* SIN6_LEN */ |
718e3744 | 263 | |
718e3744 | 264 | /* Interface between zebra message and rtm message. */ |
d62a17ae | 265 | static int kernel_rtm_ipv6(int cmd, struct prefix *p, struct route_entry *re) |
718e3744 | 266 | { |
d62a17ae | 267 | struct sockaddr_in6 *mask; |
268 | struct sockaddr_in6 sin_dest, sin_mask, sin_gate; | |
269 | struct nexthop *nexthop; | |
270 | int nexthop_num = 0; | |
271 | ifindex_t ifindex = 0; | |
272 | int gate = 0; | |
273 | int error; | |
274 | ||
275 | memset(&sin_dest, 0, sizeof(struct sockaddr_in6)); | |
276 | sin_dest.sin6_family = AF_INET6; | |
718e3744 | 277 | #ifdef SIN6_LEN |
d62a17ae | 278 | sin_dest.sin6_len = sizeof(struct sockaddr_in6); |
718e3744 | 279 | #endif /* SIN6_LEN */ |
d62a17ae | 280 | sin_dest.sin6_addr = p->u.prefix6; |
718e3744 | 281 | |
d62a17ae | 282 | memset(&sin_mask, 0, sizeof(struct sockaddr_in6)); |
718e3744 | 283 | |
d62a17ae | 284 | memset(&sin_gate, 0, sizeof(struct sockaddr_in6)); |
285 | sin_gate.sin6_family = AF_INET6; | |
6f0e3f6e | 286 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 287 | sin_gate.sin6_len = sizeof(struct sockaddr_in6); |
6f0e3f6e | 288 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 289 | |
d62a17ae | 290 | /* Make gateway. */ |
291 | for (ALL_NEXTHOPS(re->nexthop, nexthop)) { | |
292 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
293 | continue; | |
fa713d9e | 294 | |
d62a17ae | 295 | gate = 0; |
718e3744 | 296 | |
d62a17ae | 297 | if ((cmd == RTM_ADD |
298 | && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
299 | || (cmd == RTM_DELETE | |
718e3744 | 300 | #if 0 |
301 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB) | |
302 | #endif | |
d62a17ae | 303 | )) { |
304 | if (nexthop->type == NEXTHOP_TYPE_IPV6 | |
305 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) { | |
306 | sin_gate.sin6_addr = nexthop->gate.ipv6; | |
307 | gate = 1; | |
308 | } | |
309 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
310 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
311 | ifindex = nexthop->ifindex; | |
312 | ||
313 | if (cmd == RTM_ADD) | |
314 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB); | |
315 | } | |
316 | ||
317 | /* Under kame set interface index to link local address. */ | |
718e3744 | 318 | #ifdef KAME |
319 | ||
d62a17ae | 320 | #define SET_IN6_LINKLOCAL_IFINDEX(a, i) \ |
321 | do { \ | |
322 | (a).s6_addr[2] = ((i) >> 8) & 0xff; \ | |
323 | (a).s6_addr[3] = (i)&0xff; \ | |
324 | } while (0) | |
718e3744 | 325 | |
d62a17ae | 326 | if (gate && IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6_addr)) |
327 | SET_IN6_LINKLOCAL_IFINDEX(sin_gate.sin6_addr, ifindex); | |
718e3744 | 328 | #endif /* KAME */ |
329 | ||
d62a17ae | 330 | if (gate && p->prefixlen == 128) |
331 | mask = NULL; | |
332 | else { | |
333 | masklen2ip6(p->prefixlen, &sin_mask.sin6_addr); | |
334 | sin_mask.sin6_family = AF_INET6; | |
718e3744 | 335 | #ifdef SIN6_LEN |
d62a17ae | 336 | sin_mask.sin6_len = sin6_masklen(sin_mask.sin6_addr); |
718e3744 | 337 | #endif /* SIN6_LEN */ |
d62a17ae | 338 | mask = &sin_mask; |
339 | } | |
718e3744 | 340 | |
d62a17ae | 341 | error = rtm_write(cmd, (union sockunion *)&sin_dest, |
342 | (union sockunion *)mask, | |
343 | gate ? (union sockunion *)&sin_gate : NULL, | |
344 | NULL, ifindex, re->flags, re->metric); | |
718e3744 | 345 | |
346 | #if 0 | |
347 | if (error) | |
348 | { | |
be717a0a | 349 | zlog_info ("kernel_rtm_ipv6(): nexthop %d add error=%d.", |
718e3744 | 350 | nexthop_num, error); |
351 | } | |
746c4f02 | 352 | #else |
d62a17ae | 353 | (void)error; |
718e3744 | 354 | #endif |
355 | ||
d62a17ae | 356 | nexthop_num++; |
357 | } | |
718e3744 | 358 | |
d62a17ae | 359 | /* If there is no useful nexthop then return. */ |
360 | if (nexthop_num == 0) { | |
361 | if (IS_ZEBRA_DEBUG_KERNEL) | |
362 | zlog_debug("kernel_rtm_ipv6(): No useful nexthop."); | |
363 | return 0; | |
364 | } | |
718e3744 | 365 | |
d62a17ae | 366 | return 0; /*XXX*/ |
718e3744 | 367 | } |
368 | ||
d62a17ae | 369 | static int kernel_rtm(int cmd, struct prefix *p, struct route_entry *re) |
62ccf1e5 | 370 | { |
d62a17ae | 371 | switch (PREFIX_FAMILY(p)) { |
372 | case AF_INET: | |
373 | return kernel_rtm_ipv4(cmd, p, re); | |
374 | case AF_INET6: | |
375 | return kernel_rtm_ipv6(cmd, p, re); | |
376 | } | |
377 | return 0; | |
62ccf1e5 TT |
378 | } |
379 | ||
d62a17ae | 380 | int kernel_route_rib(struct prefix *p, struct prefix *src_p, |
381 | struct route_entry *old, struct route_entry *new) | |
718e3744 | 382 | { |
d62a17ae | 383 | int route = 0; |
edd7c245 | 384 | |
d62a17ae | 385 | if (src_p && src_p->prefixlen) { |
386 | zlog_err("route add: IPv6 sourcedest routes unsupported!"); | |
387 | return 1; | |
388 | } | |
05737783 | 389 | |
d62a17ae | 390 | if (zserv_privs.change(ZPRIVS_RAISE)) |
391 | zlog_err("Can't raise privileges"); | |
be717a0a | 392 | |
d62a17ae | 393 | if (old) |
394 | route |= kernel_rtm(RTM_DELETE, p, old); | |
62ccf1e5 | 395 | |
d62a17ae | 396 | if (new) |
397 | route |= kernel_rtm(RTM_ADD, p, new); | |
be717a0a | 398 | |
d62a17ae | 399 | if (zserv_privs.change(ZPRIVS_LOWER)) |
400 | zlog_err("Can't lower privileges"); | |
edd7c245 | 401 | |
d62a17ae | 402 | return route; |
718e3744 | 403 | } |
6b8a5694 | 404 | |
d62a17ae | 405 | int kernel_neigh_update(int add, int ifindex, uint32_t addr, char *lla, |
406 | int llalen) | |
6b8a5694 | 407 | { |
d62a17ae | 408 | /* TODO */ |
409 | return 0; | |
6b8a5694 | 410 | } |
1498c059 | 411 | |
43b5cc5e | 412 | extern int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *mroute) |
1498c059 | 413 | { |
d62a17ae | 414 | return 0; |
1498c059 | 415 | } |
13d60d35 | 416 | |
d62a17ae | 417 | int kernel_add_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) |
13d60d35 | 418 | { |
d62a17ae | 419 | return 0; |
13d60d35 | 420 | } |
421 | ||
d62a17ae | 422 | int kernel_del_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip) |
13d60d35 | 423 | { |
d62a17ae | 424 | return 0; |
13d60d35 | 425 | } |
2232a77c | 426 | |
d62a17ae | 427 | int kernel_add_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, |
428 | struct in_addr vtep_ip, u_char sticky) | |
2232a77c | 429 | { |
d62a17ae | 430 | return 0; |
2232a77c | 431 | } |
432 | ||
d62a17ae | 433 | int kernel_del_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac, |
434 | struct in_addr vtep_ip, int local) | |
2232a77c | 435 | { |
d62a17ae | 436 | return 0; |
2232a77c | 437 | } |
438 | ||
d62a17ae | 439 | int kernel_add_neigh(struct interface *ifp, struct ipaddr *ip, |
440 | struct ethaddr *mac) | |
2232a77c | 441 | { |
d62a17ae | 442 | return 0; |
2232a77c | 443 | } |
444 | ||
d62a17ae | 445 | int kernel_del_neigh(struct interface *ifp, struct ipaddr *ip) |
2232a77c | 446 | { |
d62a17ae | 447 | return 0; |
2232a77c | 448 | } |
e0ae31b8 DS |
449 | |
450 | extern int kernel_interface_set_master(struct interface *master, | |
451 | struct interface *slave) | |
452 | { | |
453 | return 0; | |
454 | } | |
0ecfe5bf | 455 | |
ddfeb486 | 456 | #endif /* !HAVE_NETLINK */ |