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 #include "ospfd/ospfd.h"
34 #include "ospfd/ospf_network.h"
35 #include "ospfd/ospf_interface.h"
36 #include "ospfd/ospf_asbr.h"
37 #include "ospfd/ospf_lsa.h"
38 #include "ospfd/ospf_lsdb.h"
39 #include "ospfd/ospf_neighbor.h"
40 #include "ospfd/ospf_packet.h"
43 /* Join to the OSPF ALL SPF ROUTERS multicast group. */
44 int ospf_if_add_allspfrouters(struct ospf
*top
, struct prefix
*p
,
49 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
50 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
54 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
55 "ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
56 "on # of multicast group memberships has been exceeded?",
57 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
58 safe_strerror(errno
));
61 "interface %s [%u] join AllSPFRouters Multicast group.",
62 inet_ntoa(p
->u
.prefix4
), ifindex
);
67 int ospf_if_drop_allspfrouters(struct ospf
*top
, struct prefix
*p
,
72 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
73 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
77 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
78 "ifindex %u, AllSPFRouters): %s",
79 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
80 safe_strerror(errno
));
83 "interface %s [%u] leave AllSPFRouters Multicast group.",
84 inet_ntoa(p
->u
.prefix4
), ifindex
);
89 /* Join to the OSPF ALL Designated ROUTERS multicast group. */
90 int ospf_if_add_alldrouters(struct ospf
*top
, struct prefix
*p
,
95 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
96 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
100 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
101 "ifindex %u, AllDRouters): %s; perhaps a kernel limit "
102 "on # of multicast group memberships has been exceeded?",
103 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
104 safe_strerror(errno
));
107 "interface %s [%u] join AllDRouters Multicast group.",
108 inet_ntoa(p
->u
.prefix4
), ifindex
);
113 int ospf_if_drop_alldrouters(struct ospf
*top
, struct prefix
*p
,
118 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
119 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
123 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
124 "ifindex %u, AllDRouters): %s",
125 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
126 safe_strerror(errno
));
129 "interface %s [%u] leave AllDRouters Multicast group.",
130 inet_ntoa(p
->u
.prefix4
), ifindex
);
135 int ospf_if_ipmulticast(struct ospf
*top
, struct prefix
*p
, ifindex_t ifindex
)
140 /* Prevent receiving self-origined multicast packets. */
141 ret
= setsockopt_ipv4_multicast_loop(top
->fd
, 0);
143 zlog_warn("can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
144 top
->fd
, safe_strerror(errno
));
146 /* Explicitly set multicast ttl to 1 -- endo. */
149 ret
= setsockopt(top
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&val
,
152 zlog_warn("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
153 top
->fd
, safe_strerror(errno
));
155 /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
156 * packet out of ifindex. Below would be used Non Linux system.
158 ret
= setsockopt_ipv4_multicast_if(top
->fd
, p
->u
.prefix4
, ifindex
);
161 "can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, "
163 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
164 safe_strerror(errno
));
170 int ospf_bind_vrfdevice(struct ospf
*ospf
, int ospf_sock
)
174 #ifdef SO_BINDTODEVICE
176 if (ospf
&& ospf
->vrf_id
!= VRF_DEFAULT
&&
177 ospf
->vrf_id
!= VRF_UNKNOWN
) {
178 ret
= setsockopt(ospf_sock
, SOL_SOCKET
, SO_BINDTODEVICE
,
182 int save_errno
= errno
;
184 zlog_warn("%s: Could not setsockopt SO_BINDTODEVICE %s",
186 safe_strerror(save_errno
));
194 int ospf_sock_init(struct ospf
*ospf
)
198 int bufsize
= (8 * 1024 * 1024);
200 if (ospfd_privs
.change(ZPRIVS_RAISE
)) {
201 zlog_err("ospf_sock_init: could not raise privs, %s",
202 safe_strerror(errno
));
205 ospf_sock
= socket(AF_INET
, SOCK_RAW
, IPPROTO_OSPFIGP
);
207 int save_errno
= errno
;
209 if (ospfd_privs
.change(ZPRIVS_LOWER
))
210 zlog_err("ospf_sock_init: could not lower privs, %s",
211 safe_strerror(errno
));
212 zlog_err("ospf_read_sock_init: socket: %s",
213 safe_strerror(save_errno
));
217 ret
= ospf_bind_vrfdevice(ospf
, ospf_sock
);
224 /* we will include IP header with packet */
225 ret
= setsockopt(ospf_sock
, IPPROTO_IP
, IP_HDRINCL
, &hincl
,
228 int save_errno
= errno
;
230 zlog_warn("Can't set IP_HDRINCL option for fd %d: %s",
231 ospf_sock
, safe_strerror(save_errno
));
235 #elif defined(IPTOS_PREC_INTERNETCONTROL)
236 #warning "IP_HDRINCL not available on this system"
237 #warning "using IPTOS_PREC_INTERNETCONTROL"
238 ret
= setsockopt_ipv4_tos(ospf_sock
, IPTOS_PREC_INTERNETCONTROL
);
240 int save_errno
= errno
;
242 zlog_warn("can't set sockopt IP_TOS %d to socket %d: %s", tos
,
243 ospf_sock
, safe_strerror(save_errno
));
244 close(ospf_sock
); /* Prevent sd leak. */
247 #else /* !IPTOS_PREC_INTERNETCONTROL */
248 #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
249 zlog_warn("IP_HDRINCL option not available");
250 #endif /* IP_HDRINCL */
252 ret
= setsockopt_ifindex(AF_INET
, ospf_sock
, 1);
255 zlog_warn("Can't set pktinfo option for fd %d", ospf_sock
);
257 setsockopt_so_sendbuf(ospf_sock
, bufsize
);
258 setsockopt_so_recvbuf(ospf_sock
, bufsize
);
260 ospf
->fd
= ospf_sock
;
262 if (ospfd_privs
.change(ZPRIVS_LOWER
)) {
263 zlog_err("ospf_sock_init: could not lower privs, %s",
264 safe_strerror(errno
));