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"
29 #include "zebra/zebra_errors.h"
33 #include "interface.h"
35 #include "lib_errors.h"
37 extern struct zebra_privs_t zserv_privs
;
45 static int kernel_send_rtmsg_v4(int action
, mpls_label_t in_label
,
50 struct sockaddr_mpls sa_label_in
, sa_label_out
;
51 struct sockaddr_in nexthop
;
55 if (IS_ZEBRA_DEBUG_KERNEL
)
56 zlog_debug("%s: 0x%x, label=%u", __func__
, action
, in_label
);
58 /* initialize header */
59 memset(&hdr
, 0, sizeof(hdr
));
60 hdr
.rtm_version
= RTM_VERSION
;
62 hdr
.rtm_type
= action
;
63 hdr
.rtm_flags
= RTF_UP
;
64 hdr
.rtm_fmask
= RTF_MPLS
;
65 hdr
.rtm_seq
= kr_state
.rtseq
++; /* overflow doesn't matter */
66 hdr
.rtm_msglen
= sizeof(hdr
);
67 hdr
.rtm_hdrlen
= sizeof(struct rt_msghdr
);
70 iov
[iovcnt
].iov_base
= &hdr
;
71 iov
[iovcnt
++].iov_len
= sizeof(hdr
);
74 memset(&sa_label_in
, 0, sizeof(sa_label_in
));
75 sa_label_in
.smpls_len
= sizeof(sa_label_in
);
76 sa_label_in
.smpls_family
= AF_MPLS
;
77 sa_label_in
.smpls_label
= htonl(in_label
<< MPLS_LABEL_OFFSET
);
79 hdr
.rtm_flags
|= RTF_MPLS
| RTF_MPATH
;
80 hdr
.rtm_addrs
|= RTA_DST
;
81 hdr
.rtm_msglen
+= sizeof(sa_label_in
);
83 iov
[iovcnt
].iov_base
= &sa_label_in
;
84 iov
[iovcnt
++].iov_len
= sizeof(sa_label_in
);
87 memset(&nexthop
, 0, sizeof(nexthop
));
88 nexthop
.sin_len
= sizeof(nexthop
);
89 nexthop
.sin_family
= AF_INET
;
90 nexthop
.sin_addr
= nhlfe
->nexthop
->gate
.ipv4
;
92 hdr
.rtm_flags
|= RTF_GATEWAY
;
93 hdr
.rtm_addrs
|= RTA_GATEWAY
;
94 hdr
.rtm_msglen
+= sizeof(nexthop
);
96 iov
[iovcnt
].iov_base
= &nexthop
;
97 iov
[iovcnt
++].iov_len
= sizeof(nexthop
);
99 /* If action is RTM_DELETE we have to get rid of MPLS infos */
100 if (action
!= RTM_DELETE
) {
101 memset(&sa_label_out
, 0, sizeof(sa_label_out
));
102 sa_label_out
.smpls_len
= sizeof(sa_label_out
);
103 sa_label_out
.smpls_family
= AF_MPLS
;
104 sa_label_out
.smpls_label
=
105 htonl(nhlfe
->nexthop
->nh_label
->label
[0]
106 << MPLS_LABEL_OFFSET
);
108 hdr
.rtm_addrs
|= RTA_SRC
;
109 hdr
.rtm_flags
|= RTF_MPLS
;
110 hdr
.rtm_msglen
+= sizeof(sa_label_out
);
112 iov
[iovcnt
].iov_base
= &sa_label_out
;
113 iov
[iovcnt
++].iov_len
= sizeof(sa_label_out
);
115 if (nhlfe
->nexthop
->nh_label
->label
[0] == MPLS_LABEL_IMPLNULL
)
116 hdr
.rtm_mpls
= MPLS_OP_POP
;
118 hdr
.rtm_mpls
= MPLS_OP_SWAP
;
121 frr_elevate_privs(&zserv_privs
) {
122 ret
= writev(kr_state
.fd
, iov
, iovcnt
);
126 flog_err_sys(EC_LIB_SOCKET
, "%s: %s", __func__
,
127 safe_strerror(errno
));
132 #if !defined(ROUNDUP)
134 (((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
137 static int kernel_send_rtmsg_v6(int action
, mpls_label_t in_label
,
138 zebra_nhlfe_t
*nhlfe
)
141 struct rt_msghdr hdr
;
142 struct sockaddr_mpls sa_label_in
, sa_label_out
;
144 struct sockaddr_in6 addr
;
145 char pad
[sizeof(long)]; /* thank you IPv6 */
150 if (IS_ZEBRA_DEBUG_KERNEL
)
151 zlog_debug("%s: 0x%x, label=%u", __func__
, action
, in_label
);
153 /* initialize header */
154 memset(&hdr
, 0, sizeof(hdr
));
155 hdr
.rtm_version
= RTM_VERSION
;
157 hdr
.rtm_type
= action
;
158 hdr
.rtm_flags
= RTF_UP
;
159 hdr
.rtm_fmask
= RTF_MPLS
;
160 hdr
.rtm_seq
= kr_state
.rtseq
++; /* overflow doesn't matter */
161 hdr
.rtm_msglen
= sizeof(hdr
);
162 hdr
.rtm_hdrlen
= sizeof(struct rt_msghdr
);
163 hdr
.rtm_priority
= 0;
165 iov
[iovcnt
].iov_base
= &hdr
;
166 iov
[iovcnt
++].iov_len
= sizeof(hdr
);
169 memset(&sa_label_in
, 0, sizeof(sa_label_in
));
170 sa_label_in
.smpls_len
= sizeof(sa_label_in
);
171 sa_label_in
.smpls_family
= AF_MPLS
;
172 sa_label_in
.smpls_label
= htonl(in_label
<< MPLS_LABEL_OFFSET
);
174 hdr
.rtm_flags
|= RTF_MPLS
| RTF_MPATH
;
175 hdr
.rtm_addrs
|= RTA_DST
;
176 hdr
.rtm_msglen
+= sizeof(sa_label_in
);
178 iov
[iovcnt
].iov_base
= &sa_label_in
;
179 iov
[iovcnt
++].iov_len
= sizeof(sa_label_in
);
182 memset(&nexthop
, 0, sizeof(nexthop
));
183 nexthop
.addr
.sin6_len
= sizeof(struct sockaddr_in6
);
184 nexthop
.addr
.sin6_family
= AF_INET6
;
185 nexthop
.addr
.sin6_addr
= nhlfe
->nexthop
->gate
.ipv6
;
186 if (IN6_IS_ADDR_LINKLOCAL(&nexthop
.addr
.sin6_addr
)) {
188 struct sockaddr_in6
*sin6
= &nexthop
.addr
;
190 nexthop
.addr
.sin6_scope_id
= nhlfe
->nexthop
->ifindex
;
192 memcpy(&tmp16
, &sin6
->sin6_addr
.s6_addr
[2], sizeof(tmp16
));
193 tmp16
= htons(sin6
->sin6_scope_id
);
194 memcpy(&sin6
->sin6_addr
.s6_addr
[2], &tmp16
, sizeof(tmp16
));
195 sin6
->sin6_scope_id
= 0;
199 hdr
.rtm_flags
|= RTF_GATEWAY
;
200 hdr
.rtm_addrs
|= RTA_GATEWAY
;
201 hdr
.rtm_msglen
+= ROUNDUP(sizeof(struct sockaddr_in6
));
203 iov
[iovcnt
].iov_base
= &nexthop
;
204 iov
[iovcnt
++].iov_len
= ROUNDUP(sizeof(struct sockaddr_in6
));
206 /* If action is RTM_DELETE we have to get rid of MPLS infos */
207 if (action
!= RTM_DELETE
) {
208 memset(&sa_label_out
, 0, sizeof(sa_label_out
));
209 sa_label_out
.smpls_len
= sizeof(sa_label_out
);
210 sa_label_out
.smpls_family
= AF_MPLS
;
211 sa_label_out
.smpls_label
=
212 htonl(nhlfe
->nexthop
->nh_label
->label
[0]
213 << MPLS_LABEL_OFFSET
);
215 hdr
.rtm_addrs
|= RTA_SRC
;
216 hdr
.rtm_flags
|= RTF_MPLS
;
217 hdr
.rtm_msglen
+= sizeof(sa_label_out
);
219 iov
[iovcnt
].iov_base
= &sa_label_out
;
220 iov
[iovcnt
++].iov_len
= sizeof(sa_label_out
);
222 if (nhlfe
->nexthop
->nh_label
->label
[0] == MPLS_LABEL_IMPLNULL
)
223 hdr
.rtm_mpls
= MPLS_OP_POP
;
225 hdr
.rtm_mpls
= MPLS_OP_SWAP
;
228 frr_elevate_privs(&zserv_privs
) {
229 ret
= writev(kr_state
.fd
, iov
, iovcnt
);
233 flog_err_sys(EC_LIB_SOCKET
, "%s: %s", __func__
,
234 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) {
260 flog_warn(EC_ZEBRA_MAX_LABELS_PUSH
,
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 enum zebra_dplane_result
kernel_add_lsp(zebra_lsp_t
*lsp
)
292 if (!lsp
|| !lsp
->best_nhlfe
) { // unexpected
293 kernel_lsp_pass_fail(lsp
, ZEBRA_DPLANE_INSTALL_FAILURE
);
294 return ZEBRA_DPLANE_REQUEST_FAILURE
;
297 ret
= kernel_lsp_cmd(RTM_ADD
, lsp
);
299 kernel_lsp_pass_fail(lsp
,
300 (!ret
) ? ZEBRA_DPLANE_INSTALL_SUCCESS
301 : ZEBRA_DPLANE_INSTALL_FAILURE
);
303 return ZEBRA_DPLANE_REQUEST_SUCCESS
;
306 enum zebra_dplane_result
kernel_upd_lsp(zebra_lsp_t
*lsp
)
310 if (!lsp
|| !lsp
->best_nhlfe
) { // unexpected
311 kernel_lsp_pass_fail(lsp
, ZEBRA_DPLANE_INSTALL_FAILURE
);
312 return ZEBRA_DPLANE_REQUEST_FAILURE
;
315 ret
= kernel_lsp_cmd(RTM_CHANGE
, lsp
);
317 kernel_lsp_pass_fail(lsp
,
318 (!ret
) ? ZEBRA_DPLANE_INSTALL_SUCCESS
319 : ZEBRA_DPLANE_INSTALL_FAILURE
);
320 return ZEBRA_DPLANE_REQUEST_SUCCESS
;
323 enum zebra_dplane_result
kernel_del_lsp(zebra_lsp_t
*lsp
)
327 if (!lsp
) { // unexpected
328 kernel_lsp_pass_fail(lsp
, ZEBRA_DPLANE_DELETE_FAILURE
);
329 return ZEBRA_DPLANE_REQUEST_FAILURE
;
332 if (!CHECK_FLAG(lsp
->flags
, LSP_FLAG_INSTALLED
)) {
333 kernel_lsp_pass_fail(lsp
, ZEBRA_DPLANE_DELETE_FAILURE
);
334 return ZEBRA_DPLANE_REQUEST_FAILURE
;
337 ret
= kernel_lsp_cmd(RTM_DELETE
, lsp
);
339 kernel_lsp_pass_fail(lsp
,
340 (!ret
) ? ZEBRA_DPLANE_DELETE_SUCCESS
341 : ZEBRA_DPLANE_DELETE_FAILURE
);
343 return ZEBRA_DPLANE_REQUEST_SUCCESS
;
346 static int kmpw_install(struct zebra_pw
*pw
)
350 struct sockaddr_storage ss
;
351 struct sockaddr_in
*sa_in
= (struct sockaddr_in
*)&ss
;
352 struct sockaddr_in6
*sa_in6
= (struct sockaddr_in6
*)&ss
;
354 memset(&imr
, 0, sizeof(imr
));
356 case PW_TYPE_ETHERNET
:
357 imr
.imr_type
= IMR_TYPE_ETHERNET
;
359 case PW_TYPE_ETHERNET_TAGGED
:
360 imr
.imr_type
= IMR_TYPE_ETHERNET_TAGGED
;
363 zlog_debug("%s: unhandled pseudowire type (%#X)", __func__
,
368 if (pw
->flags
& F_PSEUDOWIRE_CWORD
)
369 imr
.imr_flags
|= IMR_FLAG_CONTROLWORD
;
371 /* pseudowire nexthop */
372 memset(&ss
, 0, sizeof(ss
));
375 sa_in
->sin_family
= AF_INET
;
376 sa_in
->sin_len
= sizeof(struct sockaddr_in
);
377 sa_in
->sin_addr
= pw
->nexthop
.ipv4
;
380 sa_in6
->sin6_family
= AF_INET6
;
381 sa_in6
->sin6_len
= sizeof(struct sockaddr_in6
);
382 sa_in6
->sin6_addr
= pw
->nexthop
.ipv6
;
385 zlog_debug("%s: unhandled pseudowire address-family (%u)",
389 memcpy(&imr
.imr_nexthop
, (struct sockaddr
*)&ss
,
390 sizeof(imr
.imr_nexthop
));
392 /* pseudowire local/remote labels */
393 imr
.imr_lshim
.shim_label
= pw
->local_label
;
394 imr
.imr_rshim
.shim_label
= pw
->remote_label
;
397 memset(&ifr
, 0, sizeof(ifr
));
398 strlcpy(ifr
.ifr_name
, pw
->ifname
, sizeof(ifr
.ifr_name
));
399 ifr
.ifr_data
= (caddr_t
)&imr
;
400 if (ioctl(kr_state
.ioctl_fd
, SIOCSETMPWCFG
, &ifr
) == -1) {
401 flog_err_sys(EC_LIB_SYSTEM_CALL
, "ioctl SIOCSETMPWCFG: %s",
402 safe_strerror(errno
));
409 static int kmpw_uninstall(struct zebra_pw
*pw
)
414 memset(&ifr
, 0, sizeof(ifr
));
415 memset(&imr
, 0, sizeof(imr
));
416 strlcpy(ifr
.ifr_name
, pw
->ifname
, sizeof(ifr
.ifr_name
));
417 ifr
.ifr_data
= (caddr_t
)&imr
;
418 if (ioctl(kr_state
.ioctl_fd
, SIOCSETMPWCFG
, &ifr
) == -1) {
419 flog_err_sys(EC_LIB_SYSTEM_CALL
, "ioctl SIOCSETMPWCFG: %s",
420 safe_strerror(errno
));
427 #define MAX_RTSOCK_BUF 128 * 1024
428 int mpls_kernel_init(void)
430 int rcvbuf
, default_rcvbuf
;
433 if ((kr_state
.fd
= socket(AF_ROUTE
, SOCK_RAW
, 0)) == -1) {
434 flog_err_sys(EC_LIB_SOCKET
, "%s: socket", __func__
);
438 if ((kr_state
.ioctl_fd
= socket(AF_INET
, SOCK_DGRAM
| SOCK_NONBLOCK
, 0))
440 flog_err_sys(EC_LIB_SOCKET
, "%s: ioctl socket", __func__
);
444 /* grow receive buffer, don't wanna miss messages */
445 optlen
= sizeof(default_rcvbuf
);
446 if (getsockopt(kr_state
.fd
, SOL_SOCKET
, SO_RCVBUF
, &default_rcvbuf
,
449 flog_err_sys(EC_LIB_SOCKET
,
450 "kr_init getsockopt SOL_SOCKET SO_RCVBUF");
452 for (rcvbuf
= MAX_RTSOCK_BUF
;
453 rcvbuf
> default_rcvbuf
454 && setsockopt(kr_state
.fd
, SOL_SOCKET
, SO_RCVBUF
, &rcvbuf
,
463 /* register hook to install/uninstall pseudowires */
464 hook_register(pw_install
, kmpw_install
);
465 hook_register(pw_uninstall
, kmpw_uninstall
);
470 #endif /* OPEN_BSD */