2 * OSPF network related functions
3 * Copyright (C) 1999 Toshiaki Takada
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
28 #include "sockunion.h"
33 extern struct zebra_privs_t ospfd_privs
;
35 #include "ospfd/ospfd.h"
36 #include "ospfd/ospf_network.h"
37 #include "ospfd/ospf_interface.h"
38 #include "ospfd/ospf_asbr.h"
39 #include "ospfd/ospf_lsa.h"
40 #include "ospfd/ospf_lsdb.h"
41 #include "ospfd/ospf_neighbor.h"
42 #include "ospfd/ospf_packet.h"
45 /* Join to the OSPF ALL SPF ROUTERS multicast group. */
46 int ospf_if_add_allspfrouters(struct ospf
*top
, struct prefix
*p
,
51 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
52 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
56 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
57 "ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
58 "on # of multicast group memberships has been exceeded?",
59 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
60 safe_strerror(errno
));
63 "interface %s [%u] join AllSPFRouters Multicast group.",
64 inet_ntoa(p
->u
.prefix4
), ifindex
);
69 int ospf_if_drop_allspfrouters(struct ospf
*top
, struct prefix
*p
,
74 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
75 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
79 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
80 "ifindex %u, AllSPFRouters): %s",
81 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
82 safe_strerror(errno
));
85 "interface %s [%u] leave AllSPFRouters Multicast group.",
86 inet_ntoa(p
->u
.prefix4
), ifindex
);
91 /* Join to the OSPF ALL Designated ROUTERS multicast group. */
92 int ospf_if_add_alldrouters(struct ospf
*top
, struct prefix
*p
,
97 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
98 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
102 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
103 "ifindex %u, AllDRouters): %s; perhaps a kernel limit "
104 "on # of multicast group memberships has been exceeded?",
105 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
106 safe_strerror(errno
));
109 "interface %s [%u] join AllDRouters Multicast group.",
110 inet_ntoa(p
->u
.prefix4
), ifindex
);
115 int ospf_if_drop_alldrouters(struct ospf
*top
, struct prefix
*p
,
120 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
121 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
125 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
126 "ifindex %u, AllDRouters): %s",
127 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
128 safe_strerror(errno
));
131 "interface %s [%u] leave AllDRouters Multicast group.",
132 inet_ntoa(p
->u
.prefix4
), ifindex
);
137 int ospf_if_ipmulticast(struct ospf
*top
, struct prefix
*p
, ifindex_t ifindex
)
142 /* Prevent receiving self-origined multicast packets. */
143 ret
= setsockopt_ipv4_multicast_loop(top
->fd
, 0);
145 zlog_warn("can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
146 top
->fd
, safe_strerror(errno
));
148 /* Explicitly set multicast ttl to 1 -- endo. */
151 ret
= setsockopt(top
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&val
,
154 zlog_warn("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
155 top
->fd
, safe_strerror(errno
));
160 int ospf_bind_vrfdevice(struct ospf
*ospf
, int ospf_sock
)
164 #ifdef SO_BINDTODEVICE
166 if (ospf
&& ospf
->vrf_id
!= VRF_DEFAULT
&&
167 ospf
->vrf_id
!= VRF_UNKNOWN
) {
168 ret
= setsockopt(ospf_sock
, SOL_SOCKET
, SO_BINDTODEVICE
,
172 int save_errno
= errno
;
174 zlog_warn("%s: Could not setsockopt SO_BINDTODEVICE %s",
176 safe_strerror(save_errno
));
178 zlog_debug("%s: Bind socket %d to vrf %s id %u device",
179 __PRETTY_FUNCTION__
, ospf_sock
,
180 ospf
->name
, ospf
->vrf_id
);
187 int ospf_sock_init(struct ospf
*ospf
)
191 int bufsize
= (8 * 1024 * 1024);
193 if (ospfd_privs
.change(ZPRIVS_RAISE
)) {
194 zlog_err("ospf_sock_init: could not raise privs, %s",
195 safe_strerror(errno
));
198 ospf_sock
= socket(AF_INET
, SOCK_RAW
, IPPROTO_OSPFIGP
);
200 int save_errno
= errno
;
202 if (ospfd_privs
.change(ZPRIVS_LOWER
))
203 zlog_err("ospf_sock_init: could not lower privs, %s",
204 safe_strerror(errno
));
205 zlog_err("ospf_read_sock_init: socket: %s",
206 safe_strerror(save_errno
));
210 ret
= ospf_bind_vrfdevice(ospf
, ospf_sock
);
215 /* we will include IP header with packet */
216 ret
= setsockopt(ospf_sock
, IPPROTO_IP
, IP_HDRINCL
, &hincl
,
219 int save_errno
= errno
;
221 zlog_warn("Can't set IP_HDRINCL option for fd %d: %s",
222 ospf_sock
, safe_strerror(save_errno
));
225 #elif defined(IPTOS_PREC_INTERNETCONTROL)
226 #warning "IP_HDRINCL not available on this system"
227 #warning "using IPTOS_PREC_INTERNETCONTROL"
228 ret
= setsockopt_ipv4_tos(ospf_sock
, IPTOS_PREC_INTERNETCONTROL
);
230 int save_errno
= errno
;
232 zlog_warn("can't set sockopt IP_TOS %d to socket %d: %s", tos
,
233 ospf_sock
, safe_strerror(save_errno
));
234 close(ospf_sock
); /* Prevent sd leak. */
237 #else /* !IPTOS_PREC_INTERNETCONTROL */
238 #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
239 zlog_warn("IP_HDRINCL option not available");
240 #endif /* IP_HDRINCL */
242 ret
= setsockopt_ifindex(AF_INET
, ospf_sock
, 1);
245 zlog_warn("Can't set pktinfo option for fd %d", ospf_sock
);
247 setsockopt_so_sendbuf(ospf_sock
, bufsize
);
248 setsockopt_so_recvbuf(ospf_sock
, bufsize
);
250 ospf
->fd
= ospf_sock
;
252 if (ospfd_privs
.change(ZPRIVS_LOWER
)) {
253 zlog_err("ospf_sock_init: could not lower privs, %s",
254 safe_strerror(errno
));