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"
32 #include "lib_errors.h"
34 #include "ospfd/ospfd.h"
35 #include "ospfd/ospf_network.h"
36 #include "ospfd/ospf_interface.h"
37 #include "ospfd/ospf_asbr.h"
38 #include "ospfd/ospf_lsa.h"
39 #include "ospfd/ospf_lsdb.h"
40 #include "ospfd/ospf_neighbor.h"
41 #include "ospfd/ospf_packet.h"
42 #include "ospfd/ospf_dump.h"
44 /* Join to the OSPF ALL SPF ROUTERS multicast group. */
45 int ospf_if_add_allspfrouters(struct ospf
*top
, struct prefix
*p
,
50 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
51 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
56 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllSPFRouters): %s; perhaps a kernel limit on # of multicast group memberships has been exceeded?",
57 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
58 safe_strerror(errno
));
60 if (IS_DEBUG_OSPF_EVENT
)
62 "interface %s [%u] join AllSPFRouters Multicast group.",
63 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
),
78 flog_err(EC_LIB_SOCKET
,
79 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllSPFRouters): %s",
80 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
81 safe_strerror(errno
));
83 if (IS_DEBUG_OSPF_EVENT
)
85 "interface %s [%u] leave AllSPFRouters Multicast group.",
86 inet_ntoa(p
->u
.prefix4
), ifindex
);
92 /* Join to the OSPF ALL Designated ROUTERS multicast group. */
93 int ospf_if_add_alldrouters(struct ospf
*top
, struct prefix
*p
,
98 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
99 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
104 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllDRouters): %s; perhaps a kernel limit 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
),
124 flog_err(EC_LIB_SOCKET
,
125 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, ifindex %u, AllDRouters): %s",
126 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
127 safe_strerror(errno
));
130 "interface %s [%u] leave AllDRouters Multicast group.",
131 inet_ntoa(p
->u
.prefix4
), ifindex
);
136 int ospf_if_ipmulticast(struct ospf
*top
, struct prefix
*p
, ifindex_t ifindex
)
141 /* Prevent receiving self-origined multicast packets. */
142 ret
= setsockopt_ipv4_multicast_loop(top
->fd
, 0);
144 flog_err(EC_LIB_SOCKET
,
145 "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 flog_err(EC_LIB_SOCKET
,
155 "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
156 top
->fd
, safe_strerror(errno
));
158 /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
159 * packet out of ifindex. Below would be used Non Linux system.
161 ret
= setsockopt_ipv4_multicast_if(top
->fd
, p
->u
.prefix4
, ifindex
);
163 flog_err(EC_LIB_SOCKET
,
164 "can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, ifindex %u): %s",
165 top
->fd
, inet_ntoa(p
->u
.prefix4
), ifindex
,
166 safe_strerror(errno
));
172 int ospf_sock_init(struct ospf
*ospf
)
176 int bufsize
= (8 * 1024 * 1024);
178 /* silently ignore. already done */
182 if (ospf
->vrf_id
== VRF_UNKNOWN
) {
183 /* silently return since VRF is not ready */
186 frr_with_privs(&ospfd_privs
) {
187 ospf_sock
= vrf_socket(AF_INET
, SOCK_RAW
, IPPROTO_OSPFIGP
,
188 ospf
->vrf_id
, ospf
->name
);
190 flog_err(EC_LIB_SOCKET
,
191 "ospf_read_sock_init: socket: %s",
192 safe_strerror(errno
));
197 /* we will include IP header with packet */
198 ret
= setsockopt(ospf_sock
, IPPROTO_IP
, IP_HDRINCL
, &hincl
,
201 flog_err(EC_LIB_SOCKET
,
202 "Can't set IP_HDRINCL option for fd %d: %s",
203 ospf_sock
, safe_strerror(errno
));
207 #elif defined(IPTOS_PREC_INTERNETCONTROL)
208 #warning "IP_HDRINCL not available on this system"
209 #warning "using IPTOS_PREC_INTERNETCONTROL"
210 ret
= setsockopt_ipv4_tos(ospf_sock
,
211 IPTOS_PREC_INTERNETCONTROL
);
213 flog_err(EC_LIB_SOCKET
,
214 "can't set sockopt IP_TOS %d to socket %d: %s",
215 tos
, ospf_sock
, safe_strerror(errno
));
216 close(ospf_sock
); /* Prevent sd leak. */
219 #else /* !IPTOS_PREC_INTERNETCONTROL */
220 #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
221 flog_err(EC_LIB_UNAVAILABLE
, "IP_HDRINCL option not available");
222 #endif /* IP_HDRINCL */
224 ret
= setsockopt_ifindex(AF_INET
, ospf_sock
, 1);
227 flog_err(EC_LIB_SOCKET
,
228 "Can't set pktinfo option for fd %d",
232 setsockopt_so_sendbuf(ospf_sock
, bufsize
);
233 setsockopt_so_recvbuf(ospf_sock
, bufsize
);
235 ospf
->fd
= ospf_sock
;