2 * Copyright (C) 2016 by Open Source Routing.
4 * This file is part of GNU Zebra.
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
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.
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
25 #include <netmpls/mpls.h>
27 #include "zebra/zebra_mpls.h"
28 #include "zebra/debug.h"
32 #include "interface.h"
35 extern struct zebra_privs_t zserv_privs
;
43 static int kernel_send_rtmsg_v4(int action
, mpls_label_t in_label
,
48 struct sockaddr_mpls sa_label_in
, sa_label_out
;
49 struct sockaddr_in nexthop
;
53 if (IS_ZEBRA_DEBUG_KERNEL
)
54 zlog_debug("%s: 0x%x, label=%u", __func__
, action
, in_label
);
56 /* initialize header */
57 memset(&hdr
, 0, sizeof(hdr
));
58 hdr
.rtm_version
= RTM_VERSION
;
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
);
68 iov
[iovcnt
].iov_base
= &hdr
;
69 iov
[iovcnt
++].iov_len
= sizeof(hdr
);
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
);
77 hdr
.rtm_flags
|= RTF_MPLS
| RTF_MPATH
;
78 hdr
.rtm_addrs
|= RTA_DST
;
79 hdr
.rtm_msglen
+= sizeof(sa_label_in
);
81 iov
[iovcnt
].iov_base
= &sa_label_in
;
82 iov
[iovcnt
++].iov_len
= sizeof(sa_label_in
);
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
;
90 hdr
.rtm_flags
|= RTF_GATEWAY
;
91 hdr
.rtm_addrs
|= RTA_GATEWAY
;
92 hdr
.rtm_msglen
+= sizeof(nexthop
);
94 iov
[iovcnt
].iov_base
= &nexthop
;
95 iov
[iovcnt
++].iov_len
= sizeof(nexthop
);
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
);
106 hdr
.rtm_addrs
|= RTA_SRC
;
107 hdr
.rtm_flags
|= RTF_MPLS
;
108 hdr
.rtm_msglen
+= sizeof(sa_label_out
);
110 iov
[iovcnt
].iov_base
= &sa_label_out
;
111 iov
[iovcnt
++].iov_len
= sizeof(sa_label_out
);
113 if (nhlfe
->nexthop
->nh_label
->label
[0] == MPLS_LABEL_IMPLNULL
)
114 hdr
.rtm_mpls
= MPLS_OP_POP
;
116 hdr
.rtm_mpls
= MPLS_OP_SWAP
;
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");
126 zlog_err("%s: %s", __func__
, safe_strerror(errno
));
131 #if !defined(ROUNDUP)
133 (((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
136 static int kernel_send_rtmsg_v6(int action
, mpls_label_t in_label
,
137 zebra_nhlfe_t
*nhlfe
)
140 struct rt_msghdr hdr
;
141 struct sockaddr_mpls sa_label_in
, sa_label_out
;
143 struct sockaddr_in6 addr
;
144 char pad
[sizeof(long)]; /* thank you IPv6 */
149 if (IS_ZEBRA_DEBUG_KERNEL
)
150 zlog_debug("%s: 0x%x, label=%u", __func__
, action
, in_label
);
152 /* initialize header */
153 memset(&hdr
, 0, sizeof(hdr
));
154 hdr
.rtm_version
= RTM_VERSION
;
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;
164 iov
[iovcnt
].iov_base
= &hdr
;
165 iov
[iovcnt
++].iov_len
= sizeof(hdr
);
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
);
173 hdr
.rtm_flags
|= RTF_MPLS
| RTF_MPATH
;
174 hdr
.rtm_addrs
|= RTA_DST
;
175 hdr
.rtm_msglen
+= sizeof(sa_label_in
);
177 iov
[iovcnt
].iov_base
= &sa_label_in
;
178 iov
[iovcnt
++].iov_len
= sizeof(sa_label_in
);
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
)) {
187 struct sockaddr_in6
*sin6
= &nexthop
.addr
;
189 nexthop
.addr
.sin6_scope_id
= nhlfe
->nexthop
->ifindex
;
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;
198 hdr
.rtm_flags
|= RTF_GATEWAY
;
199 hdr
.rtm_addrs
|= RTA_GATEWAY
;
200 hdr
.rtm_msglen
+= ROUNDUP(sizeof(struct sockaddr_in6
));
202 iov
[iovcnt
].iov_base
= &nexthop
;
203 iov
[iovcnt
++].iov_len
= ROUNDUP(sizeof(struct sockaddr_in6
));
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
);
214 hdr
.rtm_addrs
|= RTA_SRC
;
215 hdr
.rtm_flags
|= RTF_MPLS
;
216 hdr
.rtm_msglen
+= sizeof(sa_label_out
);
218 iov
[iovcnt
].iov_base
= &sa_label_out
;
219 iov
[iovcnt
++].iov_len
= sizeof(sa_label_out
);
221 if (nhlfe
->nexthop
->nh_label
->label
[0] == MPLS_LABEL_IMPLNULL
)
222 hdr
.rtm_mpls
= MPLS_OP_POP
;
224 hdr
.rtm_mpls
= MPLS_OP_SWAP
;
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");
234 zlog_err("%s: %s", __func__
, safe_strerror(errno
));
239 static int kernel_lsp_cmd(int action
, zebra_lsp_t
*lsp
)
241 zebra_nhlfe_t
*nhlfe
;
242 struct nexthop
*nexthop
= NULL
;
243 unsigned int nexthop_num
= 0;
245 for (nhlfe
= lsp
->nhlfe_list
; nhlfe
; nhlfe
= nhlfe
->next
) {
246 nexthop
= nhlfe
->nexthop
;
250 if (nexthop_num
>= multipath_num
)
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
)))) {
259 if (nhlfe
->nexthop
->nh_label
->num_labels
> 1) {
261 "%s: can't push %u labels at once "
264 nhlfe
->nexthop
->nh_label
->num_labels
);
270 switch (NHLFE_FAMILY(nhlfe
)) {
272 kernel_send_rtmsg_v4(action
, lsp
->ile
.in_label
,
276 kernel_send_rtmsg_v6(action
, lsp
->ile
.in_label
,
288 void kernel_add_lsp(zebra_lsp_t
*lsp
)
292 if (!lsp
|| !lsp
->best_nhlfe
) { // unexpected
293 kernel_lsp_pass_fail(lsp
, SOUTHBOUND_INSTALL_FAILURE
);
297 ret
= kernel_lsp_cmd(RTM_ADD
, lsp
);
299 kernel_lsp_pass_fail(lsp
,
300 (!ret
) ? SOUTHBOUND_INSTALL_SUCCESS
301 : SOUTHBOUND_INSTALL_FAILURE
);
304 void kernel_upd_lsp(zebra_lsp_t
*lsp
)
308 if (!lsp
|| !lsp
->best_nhlfe
) { // unexpected
309 kernel_lsp_pass_fail(lsp
, SOUTHBOUND_INSTALL_FAILURE
);
313 ret
= kernel_lsp_cmd(RTM_CHANGE
, lsp
);
315 kernel_lsp_pass_fail(lsp
,
316 (!ret
) ? SOUTHBOUND_INSTALL_SUCCESS
317 : SOUTHBOUND_INSTALL_FAILURE
);
321 void kernel_del_lsp(zebra_lsp_t
*lsp
)
325 if (!lsp
) { // unexpected
326 kernel_lsp_pass_fail(lsp
, SOUTHBOUND_DELETE_FAILURE
);
330 if (!CHECK_FLAG(lsp
->flags
, LSP_FLAG_INSTALLED
)) {
331 kernel_lsp_pass_fail(lsp
, SOUTHBOUND_DELETE_FAILURE
);
335 ret
= kernel_lsp_cmd(RTM_DELETE
, lsp
);
337 kernel_lsp_pass_fail(lsp
,
338 (!ret
) ? SOUTHBOUND_DELETE_SUCCESS
339 : SOUTHBOUND_DELETE_FAILURE
);
342 static int kmpw_install(struct zebra_pw
*pw
)
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
;
350 memset(&imr
, 0, sizeof(imr
));
352 case PW_TYPE_ETHERNET
:
353 imr
.imr_type
= IMR_TYPE_ETHERNET
;
355 case PW_TYPE_ETHERNET_TAGGED
:
356 imr
.imr_type
= IMR_TYPE_ETHERNET_TAGGED
;
359 zlog_err("%s: unhandled pseudowire type (%#X)", __func__
,
364 if (pw
->flags
& F_PSEUDOWIRE_CWORD
)
365 imr
.imr_flags
|= IMR_FLAG_CONTROLWORD
;
367 /* pseudowire nexthop */
368 memset(&ss
, 0, sizeof(ss
));
371 sa_in
->sin_family
= AF_INET
;
372 sa_in
->sin_len
= sizeof(struct sockaddr_in
);
373 sa_in
->sin_addr
= pw
->nexthop
.ipv4
;
376 sa_in6
->sin6_family
= AF_INET6
;
377 sa_in6
->sin6_len
= sizeof(struct sockaddr_in6
);
378 sa_in6
->sin6_addr
= pw
->nexthop
.ipv6
;
381 zlog_err("%s: unhandled pseudowire address-family (%u)",
385 memcpy(&imr
.imr_nexthop
, (struct sockaddr
*)&ss
,
386 sizeof(imr
.imr_nexthop
));
388 /* pseudowire local/remote labels */
389 imr
.imr_lshim
.shim_label
= pw
->local_label
;
390 imr
.imr_rshim
.shim_label
= pw
->remote_label
;
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
));
404 static int kmpw_uninstall(struct zebra_pw
*pw
)
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
));
421 #define MAX_RTSOCK_BUF 128 * 1024
422 int mpls_kernel_init(void)
424 int rcvbuf
, default_rcvbuf
;
427 if ((kr_state
.fd
= socket(AF_ROUTE
, SOCK_RAW
, 0)) == -1) {
428 zlog_warn("%s: socket", __func__
);
432 if ((kr_state
.ioctl_fd
= socket(AF_INET
, SOCK_DGRAM
| SOCK_NONBLOCK
, 0))
434 zlog_warn("%s: ioctl socket", __func__
);
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
,
443 zlog_warn("kr_init getsockopt SOL_SOCKET SO_RCVBUF");
445 for (rcvbuf
= MAX_RTSOCK_BUF
;
446 rcvbuf
> default_rcvbuf
447 && setsockopt(kr_state
.fd
, SOL_SOCKET
, SO_RCVBUF
, &rcvbuf
,
456 /* register hook to install/uninstall pseudowires */
457 hook_register(pw_install
, kmpw_install
);
458 hook_register(pw_uninstall
, kmpw_uninstall
);
463 #endif /* OPEN_BSD */