2 * Kernel routing table updates by routing socket.
3 * Copyright (C) 1997, 98 Kunihiro Ishiguro
5 * This file is part of GNU Zebra.
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
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.
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
27 #include <netmpls/mpls.h>
32 #include "sockunion.h"
36 #include "lib_errors.h"
38 #include "zebra/debug.h"
39 #include "zebra/rib.h"
41 #include "zebra/kernel_socket.h"
42 #include "zebra/zebra_mpls.h"
43 #include "zebra/zebra_errors.h"
45 extern struct zebra_privs_t zserv_privs
;
47 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
48 /* Adjust netmask socket length. Return value is a adjusted sin_len
50 static int sin_masklen(struct in_addr mask
)
54 struct sockaddr_in sin
;
60 len
= sizeof(struct sockaddr_in
);
62 lim
= (char *)&sin
.sin_addr
;
63 p
= lim
+ sizeof(sin
.sin_addr
);
65 while (*--p
== 0 && p
>= lim
)
69 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
72 static int kernel_rtm_add_labels(struct mpls_label_stack
*nh_label
,
73 struct sockaddr_mpls
*smpls
)
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
);
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
);
93 /* Calculate sin6_len value for netmask socket value. */
94 static int sin6_masklen(struct in6_addr mask
)
96 struct sockaddr_in6 sin6
;
100 if (IN6_IS_ADDR_UNSPECIFIED(&mask
))
103 sin6
.sin6_addr
= mask
;
104 len
= sizeof(struct sockaddr_in6
);
106 lim
= (char *)&sin6
.sin6_addr
;
107 p
= lim
+ sizeof(sin6
.sin6_addr
);
109 while (*--p
== 0 && p
>= lim
)
114 #endif /* SIN6_LEN */
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
)
121 union sockunion sin_dest
, sin_mask
, sin_gate
;
123 struct sockaddr_mpls smpls
;
125 union sockunion
*smplsp
= NULL
;
126 struct nexthop
*nexthop
;
128 ifindex_t ifindex
= 0;
131 char prefix_buf
[PREFIX_STRLEN
];
132 enum blackhole_type bh_type
= BLACKHOLE_UNSPEC
;
134 if (IS_ZEBRA_DEBUG_RIB
)
135 prefix2str(p
, prefix_buf
, sizeof(prefix_buf
));
138 * We only have the ability to ADD or DELETE at this point
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
),
150 memset(&sin_dest
, 0, sizeof(sin_dest
));
151 memset(&sin_gate
, 0, sizeof(sin_gate
));
152 memset(&sin_mask
, 0, sizeof(sin_mask
));
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
;
165 sin_dest
.sin6
.sin6_family
= AF_INET6
;
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 */
178 for (ALL_NEXTHOPS_PTR(ng
, nexthop
)) {
180 * We only want to use the actual good nexthops
182 if (CHECK_FLAG(nexthop
->flags
, NEXTHOP_FLAG_RECURSIVE
) ||
183 !CHECK_FLAG(nexthop
->flags
, NEXTHOP_FLAG_ACTIVE
))
188 char gate_buf
[INET_ADDRSTRLEN
] = "NULL";
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
;
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 */
206 #define SET_IN6_LINKLOCAL_IFINDEX(a, i) \
208 (a).s6_addr[2] = ((i) >> 8) & 0xff; \
209 (a).s6_addr[3] = (i)&0xff; \
212 if (IN6_IS_ADDR_LINKLOCAL(&sin_gate
.sin6
.sin6_addr
))
213 SET_IN6_LINKLOCAL_IFINDEX(
214 sin_gate
.sin6
.sin6_addr
,
220 case NEXTHOP_TYPE_IFINDEX
:
221 ifindex
= nexthop
->ifindex
;
223 case NEXTHOP_TYPE_BLACKHOLE
:
224 bh_type
= nexthop
->bh_type
;
227 struct in_addr loopback
;
228 loopback
.s_addr
= htonl(INADDR_LOOPBACK
);
229 sin_gate
.sin
.sin_addr
= loopback
;
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 */
248 masklen2ip6(p
->prefixlen
, &sin_mask
.sin6
.sin6_addr
);
249 sin_mask
.sin6
.sin6_family
= AF_INET6
;
251 sin_mask
.sin6
.sin6_len
= sin6_masklen(
252 sin_mask
.sin6
.sin6_addr
);
253 #endif /* SIN6_LEN */
258 if (nexthop
->nh_label
259 && !kernel_rtm_add_labels(nexthop
->nh_label
, &smpls
))
261 smplsp
= (union sockunion
*)&smpls
;
263 error
= rtm_write(cmd
, &sin_dest
, &sin_mask
,
264 gate
? &sin_gate
: NULL
, smplsp
,
265 ifindex
, bh_type
, metric
);
267 if (IS_ZEBRA_DEBUG_KERNEL
) {
269 zlog_debug("%s: %s: attention! gate not found for re",
270 __func__
, prefix_buf
);
272 inet_ntop(p
->family
== AFI_IP
? AF_INET
274 &sin_gate
.sin
.sin_addr
,
275 gate_buf
, INET_ADDRSTRLEN
);
278 /* We only flag nexthops as being in FIB if
279 * rtm_write() did its work. */
280 case ZEBRA_ERR_NOERROR
:
282 if (IS_ZEBRA_DEBUG_KERNEL
)
283 zlog_debug("%s: %s: successfully did NH %s",
284 __func__
, prefix_buf
, gate_buf
);
286 SET_FLAG(nexthop
->flags
, NEXTHOP_FLAG_FIB
);
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
295 case ZEBRA_ERR_RTEXIST
:
297 flog_err(EC_LIB_SYSTEM_CALL
,
298 "%s: rtm_write() returned %d for command %d",
299 __func__
, error
, cmd
);
302 /* Note any unexpected status returns */
304 flog_err(EC_LIB_SYSTEM_CALL
,
305 "%s: %s: rtm_write() unexpectedly returned %d for command %s",
307 prefix2str(p
, prefix_buf
,
309 error
, lookup_msg(rtm_type_str
, cmd
, NULL
));
312 } /* for (ALL_NEXTHOPS(...))*/
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
)));
327 * Update or delete a prefix from the kernel,
328 * using info from a dataplane context struct.
330 enum zebra_dplane_result
kernel_route_update(struct zebra_dplane_ctx
*ctx
)
332 enum zebra_dplane_result res
= ZEBRA_DPLANE_REQUEST_SUCCESS
;
334 if (dplane_ctx_get_src(ctx
) != NULL
) {
335 zlog_err("route add: IPv6 sourcedest routes unsupported!");
336 res
= ZEBRA_DPLANE_REQUEST_FAILURE
;
340 frr_elevate_privs(&zserv_privs
) {
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
354 kernel_rtm(RTM_DELETE
, dplane_ctx_get_dest(ctx
),
355 dplane_ctx_get_old_ng(ctx
),
356 dplane_ctx_get_old_metric(ctx
));
358 kernel_rtm(RTM_ADD
, dplane_ctx_get_dest(ctx
),
359 dplane_ctx_get_ng(ctx
),
360 dplane_ctx_get_metric(ctx
));
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
;
367 } /* Elevated privs */
374 int kernel_neigh_update(int add
, int ifindex
, uint32_t addr
, char *lla
,
375 int llalen
, ns_id_t ns_id
)
381 extern int kernel_get_ipmr_sg_stats(struct zebra_vrf
*zvrf
, void *mroute
)
386 int kernel_add_vtep(vni_t vni
, struct interface
*ifp
, struct in_addr
*vtep_ip
)
391 int kernel_del_vtep(vni_t vni
, struct interface
*ifp
, struct in_addr
*vtep_ip
)
396 int kernel_add_mac(struct interface
*ifp
, vlanid_t vid
, struct ethaddr
*mac
,
397 struct in_addr vtep_ip
, bool sticky
)
402 int kernel_del_mac(struct interface
*ifp
, vlanid_t vid
, struct ethaddr
*mac
,
403 struct in_addr vtep_ip
)
408 int kernel_add_neigh(struct interface
*ifp
, struct ipaddr
*ip
,
409 struct ethaddr
*mac
, uint8_t flags
)
414 int kernel_del_neigh(struct interface
*ifp
, struct ipaddr
*ip
)
419 extern int kernel_interface_set_master(struct interface
*master
,
420 struct interface
*slave
)
425 uint32_t kernel_get_speed(struct interface
*ifp
)
430 #endif /* !HAVE_NETLINK */