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7fc02572 RW |
1 | /* |
2 | * Copyright (C) 2016 by Open Source Routing. | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
7fc02572 RW |
19 | */ |
20 | ||
d3e2c74a | 21 | #include <zebra.h> |
ddfeb486 DL |
22 | |
23 | #ifdef OPEN_BSD | |
24 | ||
d3e2c74a RW |
25 | #include <netmpls/mpls.h> |
26 | #include "zebra/rt.h" | |
27 | #include "zebra/zebra_mpls.h" | |
28 | #include "zebra/debug.h" | |
29 | ||
30 | #include "privs.h" | |
31 | #include "prefix.h" | |
32 | #include "interface.h" | |
33 | #include "log.h" | |
34 | ||
35 | extern struct zebra_privs_t zserv_privs; | |
36 | ||
37 | struct { | |
d62a17ae | 38 | u_int32_t rtseq; |
39 | int fd; | |
d42127da | 40 | int ioctl_fd; |
d3e2c74a RW |
41 | } kr_state; |
42 | ||
d62a17ae | 43 | static int kernel_send_rtmsg_v4(int action, mpls_label_t in_label, |
44 | zebra_nhlfe_t *nhlfe) | |
d3e2c74a | 45 | { |
d62a17ae | 46 | struct iovec iov[5]; |
47 | struct rt_msghdr hdr; | |
48 | struct sockaddr_mpls sa_label_in, sa_label_out; | |
49 | struct sockaddr_in nexthop; | |
50 | int iovcnt = 0; | |
51 | int ret; | |
52 | ||
53 | if (IS_ZEBRA_DEBUG_KERNEL) | |
54 | zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label); | |
55 | ||
56 | /* initialize header */ | |
57 | memset(&hdr, 0, sizeof(hdr)); | |
58 | hdr.rtm_version = RTM_VERSION; | |
59 | ||
60 | hdr.rtm_type = action; | |
61 | hdr.rtm_flags = RTF_UP; | |
62 | hdr.rtm_fmask = RTF_MPLS; | |
63 | hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ | |
64 | hdr.rtm_msglen = sizeof(hdr); | |
65 | hdr.rtm_hdrlen = sizeof(struct rt_msghdr); | |
66 | hdr.rtm_priority = 0; | |
67 | /* adjust iovec */ | |
68 | iov[iovcnt].iov_base = &hdr; | |
69 | iov[iovcnt++].iov_len = sizeof(hdr); | |
70 | ||
71 | /* in label */ | |
72 | memset(&sa_label_in, 0, sizeof(sa_label_in)); | |
73 | sa_label_in.smpls_len = sizeof(sa_label_in); | |
74 | sa_label_in.smpls_family = AF_MPLS; | |
75 | sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET); | |
76 | /* adjust header */ | |
77 | hdr.rtm_flags |= RTF_MPLS | RTF_MPATH; | |
78 | hdr.rtm_addrs |= RTA_DST; | |
79 | hdr.rtm_msglen += sizeof(sa_label_in); | |
80 | /* adjust iovec */ | |
81 | iov[iovcnt].iov_base = &sa_label_in; | |
82 | iov[iovcnt++].iov_len = sizeof(sa_label_in); | |
83 | ||
84 | /* nexthop */ | |
85 | memset(&nexthop, 0, sizeof(nexthop)); | |
86 | nexthop.sin_len = sizeof(nexthop); | |
87 | nexthop.sin_family = AF_INET; | |
88 | nexthop.sin_addr = nhlfe->nexthop->gate.ipv4; | |
89 | /* adjust header */ | |
90 | hdr.rtm_flags |= RTF_GATEWAY; | |
91 | hdr.rtm_addrs |= RTA_GATEWAY; | |
92 | hdr.rtm_msglen += sizeof(nexthop); | |
93 | /* adjust iovec */ | |
94 | iov[iovcnt].iov_base = &nexthop; | |
95 | iov[iovcnt++].iov_len = sizeof(nexthop); | |
96 | ||
97 | /* If action is RTM_DELETE we have to get rid of MPLS infos */ | |
98 | if (action != RTM_DELETE) { | |
99 | memset(&sa_label_out, 0, sizeof(sa_label_out)); | |
100 | sa_label_out.smpls_len = sizeof(sa_label_out); | |
101 | sa_label_out.smpls_family = AF_MPLS; | |
102 | sa_label_out.smpls_label = | |
103 | htonl(nhlfe->nexthop->nh_label->label[0] | |
104 | << MPLS_LABEL_OFFSET); | |
105 | /* adjust header */ | |
106 | hdr.rtm_addrs |= RTA_SRC; | |
107 | hdr.rtm_flags |= RTF_MPLS; | |
108 | hdr.rtm_msglen += sizeof(sa_label_out); | |
109 | /* adjust iovec */ | |
110 | iov[iovcnt].iov_base = &sa_label_out; | |
111 | iov[iovcnt++].iov_len = sizeof(sa_label_out); | |
112 | ||
113 | if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL) | |
114 | hdr.rtm_mpls = MPLS_OP_POP; | |
115 | else | |
116 | hdr.rtm_mpls = MPLS_OP_SWAP; | |
117 | } | |
118 | ||
119 | if (zserv_privs.change(ZPRIVS_RAISE)) | |
120 | zlog_err("Can't raise privileges"); | |
121 | ret = writev(kr_state.fd, iov, iovcnt); | |
122 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
123 | zlog_err("Can't lower privileges"); | |
124 | ||
125 | if (ret == -1) | |
126 | zlog_err("%s: %s", __func__, safe_strerror(errno)); | |
127 | ||
128 | return ret; | |
e07486ce RW |
129 | } |
130 | ||
131 | #if !defined(ROUNDUP) | |
d62a17ae | 132 | #define ROUNDUP(a) \ |
133 | (((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a)) | |
e07486ce RW |
134 | #endif |
135 | ||
d62a17ae | 136 | static int kernel_send_rtmsg_v6(int action, mpls_label_t in_label, |
137 | zebra_nhlfe_t *nhlfe) | |
e07486ce | 138 | { |
d62a17ae | 139 | struct iovec iov[5]; |
140 | struct rt_msghdr hdr; | |
141 | struct sockaddr_mpls sa_label_in, sa_label_out; | |
142 | struct pad { | |
143 | struct sockaddr_in6 addr; | |
144 | char pad[sizeof(long)]; /* thank you IPv6 */ | |
145 | } nexthop; | |
146 | int iovcnt = 0; | |
147 | int ret; | |
148 | ||
149 | if (IS_ZEBRA_DEBUG_KERNEL) | |
150 | zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label); | |
151 | ||
152 | /* initialize header */ | |
153 | memset(&hdr, 0, sizeof(hdr)); | |
154 | hdr.rtm_version = RTM_VERSION; | |
155 | ||
156 | hdr.rtm_type = action; | |
157 | hdr.rtm_flags = RTF_UP; | |
158 | hdr.rtm_fmask = RTF_MPLS; | |
159 | hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ | |
160 | hdr.rtm_msglen = sizeof(hdr); | |
161 | hdr.rtm_hdrlen = sizeof(struct rt_msghdr); | |
162 | hdr.rtm_priority = 0; | |
163 | /* adjust iovec */ | |
164 | iov[iovcnt].iov_base = &hdr; | |
165 | iov[iovcnt++].iov_len = sizeof(hdr); | |
166 | ||
167 | /* in label */ | |
168 | memset(&sa_label_in, 0, sizeof(sa_label_in)); | |
169 | sa_label_in.smpls_len = sizeof(sa_label_in); | |
170 | sa_label_in.smpls_family = AF_MPLS; | |
171 | sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET); | |
172 | /* adjust header */ | |
173 | hdr.rtm_flags |= RTF_MPLS | RTF_MPATH; | |
174 | hdr.rtm_addrs |= RTA_DST; | |
175 | hdr.rtm_msglen += sizeof(sa_label_in); | |
176 | /* adjust iovec */ | |
177 | iov[iovcnt].iov_base = &sa_label_in; | |
178 | iov[iovcnt++].iov_len = sizeof(sa_label_in); | |
179 | ||
180 | /* nexthop */ | |
181 | memset(&nexthop, 0, sizeof(nexthop)); | |
182 | nexthop.addr.sin6_len = sizeof(struct sockaddr_in6); | |
183 | nexthop.addr.sin6_family = AF_INET6; | |
184 | nexthop.addr.sin6_addr = nhlfe->nexthop->gate.ipv6; | |
185 | if (IN6_IS_ADDR_LINKLOCAL(&nexthop.addr.sin6_addr)) { | |
186 | uint16_t tmp16; | |
187 | struct sockaddr_in6 *sin6 = &nexthop.addr; | |
188 | ||
189 | nexthop.addr.sin6_scope_id = nhlfe->nexthop->ifindex; | |
190 | ||
191 | memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16)); | |
192 | tmp16 = htons(sin6->sin6_scope_id); | |
193 | memcpy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16)); | |
194 | sin6->sin6_scope_id = 0; | |
195 | } | |
196 | ||
197 | /* adjust header */ | |
198 | hdr.rtm_flags |= RTF_GATEWAY; | |
199 | hdr.rtm_addrs |= RTA_GATEWAY; | |
200 | hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6)); | |
201 | /* adjust iovec */ | |
202 | iov[iovcnt].iov_base = &nexthop; | |
203 | iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6)); | |
204 | ||
205 | /* If action is RTM_DELETE we have to get rid of MPLS infos */ | |
206 | if (action != RTM_DELETE) { | |
207 | memset(&sa_label_out, 0, sizeof(sa_label_out)); | |
208 | sa_label_out.smpls_len = sizeof(sa_label_out); | |
209 | sa_label_out.smpls_family = AF_MPLS; | |
210 | sa_label_out.smpls_label = | |
211 | htonl(nhlfe->nexthop->nh_label->label[0] | |
212 | << MPLS_LABEL_OFFSET); | |
213 | /* adjust header */ | |
214 | hdr.rtm_addrs |= RTA_SRC; | |
215 | hdr.rtm_flags |= RTF_MPLS; | |
216 | hdr.rtm_msglen += sizeof(sa_label_out); | |
217 | /* adjust iovec */ | |
218 | iov[iovcnt].iov_base = &sa_label_out; | |
219 | iov[iovcnt++].iov_len = sizeof(sa_label_out); | |
220 | ||
221 | if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL) | |
222 | hdr.rtm_mpls = MPLS_OP_POP; | |
223 | else | |
224 | hdr.rtm_mpls = MPLS_OP_SWAP; | |
225 | } | |
226 | ||
227 | if (zserv_privs.change(ZPRIVS_RAISE)) | |
228 | zlog_err("Can't raise privileges"); | |
229 | ret = writev(kr_state.fd, iov, iovcnt); | |
230 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
231 | zlog_err("Can't lower privileges"); | |
232 | ||
233 | if (ret == -1) | |
234 | zlog_err("%s: %s", __func__, safe_strerror(errno)); | |
235 | ||
236 | return ret; | |
d3e2c74a RW |
237 | } |
238 | ||
d62a17ae | 239 | static int kernel_lsp_cmd(int action, zebra_lsp_t *lsp) |
d3e2c74a | 240 | { |
d62a17ae | 241 | zebra_nhlfe_t *nhlfe; |
242 | struct nexthop *nexthop = NULL; | |
243 | unsigned int nexthop_num = 0; | |
244 | ||
245 | for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next) { | |
246 | nexthop = nhlfe->nexthop; | |
247 | if (!nexthop) | |
248 | continue; | |
249 | ||
250 | if (nexthop_num >= multipath_num) | |
251 | break; | |
252 | ||
253 | if (((action == RTM_ADD || action == RTM_CHANGE) | |
254 | && (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED) | |
255 | && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))) | |
256 | || (action == RTM_DELETE | |
257 | && (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED) | |
258 | && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB)))) { | |
5e8c8947 RW |
259 | if (nhlfe->nexthop->nh_label->num_labels > 1) { |
260 | zlog_warn( | |
261 | "%s: can't push %u labels at once " | |
262 | "(maximum is 1)", | |
263 | __func__, | |
264 | nhlfe->nexthop->nh_label->num_labels); | |
265 | continue; | |
266 | } | |
267 | ||
d62a17ae | 268 | nexthop_num++; |
269 | ||
270 | switch (NHLFE_FAMILY(nhlfe)) { | |
271 | case AF_INET: | |
272 | kernel_send_rtmsg_v4(action, lsp->ile.in_label, | |
273 | nhlfe); | |
274 | break; | |
275 | case AF_INET6: | |
276 | kernel_send_rtmsg_v6(action, lsp->ile.in_label, | |
277 | nhlfe); | |
278 | break; | |
279 | default: | |
280 | break; | |
281 | } | |
d62a17ae | 282 | } |
283 | } | |
284 | ||
285 | return (0); | |
d3e2c74a RW |
286 | } |
287 | ||
4a83e7a0 | 288 | void kernel_add_lsp(zebra_lsp_t *lsp) |
d3e2c74a | 289 | { |
d62a17ae | 290 | int ret; |
c4c8dec0 | 291 | |
4a83e7a0 DS |
292 | if (!lsp || !lsp->best_nhlfe) { // unexpected |
293 | kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE); | |
294 | return; | |
295 | } | |
d3e2c74a | 296 | |
d62a17ae | 297 | ret = kernel_lsp_cmd(RTM_ADD, lsp); |
c4c8dec0 | 298 | |
4a83e7a0 | 299 | kernel_lsp_pass_fail(lsp, |
996c9314 LB |
300 | (!ret) ? SOUTHBOUND_INSTALL_SUCCESS |
301 | : SOUTHBOUND_INSTALL_FAILURE); | |
d3e2c74a RW |
302 | } |
303 | ||
4a83e7a0 | 304 | void kernel_upd_lsp(zebra_lsp_t *lsp) |
d3e2c74a | 305 | { |
d62a17ae | 306 | int ret; |
c4c8dec0 | 307 | |
4a83e7a0 DS |
308 | if (!lsp || !lsp->best_nhlfe) { // unexpected |
309 | kernel_lsp_pass_fail(lsp, SOUTHBOUND_INSTALL_FAILURE); | |
310 | return; | |
311 | } | |
d3e2c74a | 312 | |
d62a17ae | 313 | ret = kernel_lsp_cmd(RTM_CHANGE, lsp); |
c4c8dec0 | 314 | |
4a83e7a0 | 315 | kernel_lsp_pass_fail(lsp, |
996c9314 LB |
316 | (!ret) ? SOUTHBOUND_INSTALL_SUCCESS |
317 | : SOUTHBOUND_INSTALL_FAILURE); | |
4a83e7a0 | 318 | return; |
d3e2c74a RW |
319 | } |
320 | ||
4a83e7a0 | 321 | void kernel_del_lsp(zebra_lsp_t *lsp) |
d3e2c74a | 322 | { |
d62a17ae | 323 | int ret; |
c4c8dec0 | 324 | |
4a83e7a0 | 325 | if (!lsp) { // unexpected |
996c9314 | 326 | kernel_lsp_pass_fail(lsp, SOUTHBOUND_DELETE_FAILURE); |
4a83e7a0 DS |
327 | return; |
328 | } | |
d3e2c74a | 329 | |
4a83e7a0 | 330 | if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) { |
996c9314 | 331 | kernel_lsp_pass_fail(lsp, SOUTHBOUND_DELETE_FAILURE); |
4a83e7a0 DS |
332 | return; |
333 | } | |
c4c8dec0 | 334 | |
d62a17ae | 335 | ret = kernel_lsp_cmd(RTM_DELETE, lsp); |
c4c8dec0 | 336 | |
4a83e7a0 | 337 | kernel_lsp_pass_fail(lsp, |
996c9314 LB |
338 | (!ret) ? SOUTHBOUND_DELETE_SUCCESS |
339 | : SOUTHBOUND_DELETE_FAILURE); | |
d3e2c74a RW |
340 | } |
341 | ||
d42127da RW |
342 | static int kmpw_install(struct zebra_pw *pw) |
343 | { | |
344 | struct ifreq ifr; | |
345 | struct ifmpwreq imr; | |
346 | struct sockaddr_storage ss; | |
347 | struct sockaddr_in *sa_in = (struct sockaddr_in *)&ss; | |
348 | struct sockaddr_in6 *sa_in6 = (struct sockaddr_in6 *)&ss; | |
349 | ||
350 | memset(&imr, 0, sizeof(imr)); | |
351 | switch (pw->type) { | |
352 | case PW_TYPE_ETHERNET: | |
353 | imr.imr_type = IMR_TYPE_ETHERNET; | |
354 | break; | |
355 | case PW_TYPE_ETHERNET_TAGGED: | |
356 | imr.imr_type = IMR_TYPE_ETHERNET_TAGGED; | |
357 | break; | |
358 | default: | |
359 | zlog_err("%s: unhandled pseudowire type (%#X)", __func__, | |
360 | pw->type); | |
361 | return -1; | |
362 | } | |
363 | ||
364 | if (pw->flags & F_PSEUDOWIRE_CWORD) | |
365 | imr.imr_flags |= IMR_FLAG_CONTROLWORD; | |
366 | ||
367 | /* pseudowire nexthop */ | |
368 | memset(&ss, 0, sizeof(ss)); | |
369 | switch (pw->af) { | |
370 | case AF_INET: | |
371 | sa_in->sin_family = AF_INET; | |
372 | sa_in->sin_len = sizeof(struct sockaddr_in); | |
373 | sa_in->sin_addr = pw->nexthop.ipv4; | |
374 | break; | |
375 | case AF_INET6: | |
376 | sa_in6->sin6_family = AF_INET6; | |
377 | sa_in6->sin6_len = sizeof(struct sockaddr_in6); | |
378 | sa_in6->sin6_addr = pw->nexthop.ipv6; | |
379 | break; | |
380 | default: | |
381 | zlog_err("%s: unhandled pseudowire address-family (%u)", | |
382 | __func__, pw->af); | |
383 | return -1; | |
384 | } | |
385 | memcpy(&imr.imr_nexthop, (struct sockaddr *)&ss, | |
386 | sizeof(imr.imr_nexthop)); | |
387 | ||
388 | /* pseudowire local/remote labels */ | |
389 | imr.imr_lshim.shim_label = pw->local_label; | |
390 | imr.imr_rshim.shim_label = pw->remote_label; | |
391 | ||
392 | /* ioctl */ | |
393 | memset(&ifr, 0, sizeof(ifr)); | |
394 | strlcpy(ifr.ifr_name, pw->ifname, sizeof(ifr.ifr_name)); | |
395 | ifr.ifr_data = (caddr_t)&imr; | |
396 | if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) { | |
397 | zlog_err("ioctl SIOCSETMPWCFG: %s", safe_strerror(errno)); | |
398 | return -1; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int kmpw_uninstall(struct zebra_pw *pw) | |
405 | { | |
406 | struct ifreq ifr; | |
407 | struct ifmpwreq imr; | |
408 | ||
409 | memset(&ifr, 0, sizeof(ifr)); | |
410 | memset(&imr, 0, sizeof(imr)); | |
411 | strlcpy(ifr.ifr_name, pw->ifname, sizeof(ifr.ifr_name)); | |
412 | ifr.ifr_data = (caddr_t)&imr; | |
413 | if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) { | |
414 | zlog_err("ioctl SIOCSETMPWCFG: %s", safe_strerror(errno)); | |
415 | return -1; | |
416 | } | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
d3e2c74a | 421 | #define MAX_RTSOCK_BUF 128 * 1024 |
d62a17ae | 422 | int mpls_kernel_init(void) |
d3e2c74a | 423 | { |
d62a17ae | 424 | int rcvbuf, default_rcvbuf; |
425 | socklen_t optlen; | |
426 | ||
427 | if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) { | |
428 | zlog_warn("%s: socket", __func__); | |
429 | return -1; | |
430 | } | |
431 | ||
d42127da RW |
432 | if ((kr_state.ioctl_fd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, 0)) |
433 | == -1) { | |
434 | zlog_warn("%s: ioctl socket", __func__); | |
435 | return -1; | |
436 | } | |
437 | ||
d62a17ae | 438 | /* grow receive buffer, don't wanna miss messages */ |
439 | optlen = sizeof(default_rcvbuf); | |
440 | if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &default_rcvbuf, | |
441 | &optlen) | |
442 | == -1) | |
443 | zlog_warn("kr_init getsockopt SOL_SOCKET SO_RCVBUF"); | |
444 | else | |
445 | for (rcvbuf = MAX_RTSOCK_BUF; | |
446 | rcvbuf > default_rcvbuf | |
447 | && setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, | |
448 | sizeof(rcvbuf)) | |
449 | == -1 | |
450 | && errno == ENOBUFS; | |
451 | rcvbuf /= 2) | |
452 | ; /* nothing */ | |
453 | ||
454 | kr_state.rtseq = 1; | |
455 | ||
d42127da RW |
456 | /* register hook to install/uninstall pseudowires */ |
457 | hook_register(pw_install, kmpw_install); | |
458 | hook_register(pw_uninstall, kmpw_uninstall); | |
459 | ||
d62a17ae | 460 | return 0; |
d3e2c74a | 461 | } |
ddfeb486 DL |
462 | |
463 | #endif /* OPEN_BSD */ |