1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * OSPF network related functions
4 * Copyright (C) 1999 Toshiaki Takada
13 #include "sockunion.h"
17 #include "lib_errors.h"
19 #include "ospfd/ospfd.h"
20 #include "ospfd/ospf_network.h"
21 #include "ospfd/ospf_interface.h"
22 #include "ospfd/ospf_asbr.h"
23 #include "ospfd/ospf_lsa.h"
24 #include "ospfd/ospf_lsdb.h"
25 #include "ospfd/ospf_neighbor.h"
26 #include "ospfd/ospf_packet.h"
27 #include "ospfd/ospf_dump.h"
29 /* Join to the OSPF ALL SPF ROUTERS multicast group. */
30 int ospf_if_add_allspfrouters(struct ospf
*top
, struct prefix
*p
,
35 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
36 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
41 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s; perhaps a kernel limit on # of multicast group memberships has been exceeded?",
42 top
->fd
, &p
->u
.prefix4
, ifindex
,
43 safe_strerror(errno
));
45 if (IS_DEBUG_OSPF_EVENT
)
47 "interface %pI4 [%u] join AllSPFRouters Multicast group.",
48 &p
->u
.prefix4
, ifindex
);
54 int ospf_if_drop_allspfrouters(struct ospf
*top
, struct prefix
*p
,
59 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
60 p
->u
.prefix4
, htonl(OSPF_ALLSPFROUTERS
),
63 flog_err(EC_LIB_SOCKET
,
64 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s",
65 top
->fd
, &p
->u
.prefix4
, ifindex
,
66 safe_strerror(errno
));
68 if (IS_DEBUG_OSPF_EVENT
)
70 "interface %pI4 [%u] leave AllSPFRouters Multicast group.",
71 &p
->u
.prefix4
, ifindex
);
77 /* Join to the OSPF ALL Designated ROUTERS multicast group. */
78 int ospf_if_add_alldrouters(struct ospf
*top
, struct prefix
*p
,
83 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_ADD_MEMBERSHIP
,
84 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
89 "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s; perhaps a kernel limit on # of multicast group memberships has been exceeded?",
90 top
->fd
, &p
->u
.prefix4
, ifindex
,
91 safe_strerror(errno
));
93 if (IS_DEBUG_OSPF_EVENT
)
95 "interface %pI4 [%u] join AllDRouters Multicast group.",
96 &p
->u
.prefix4
, ifindex
);
101 int ospf_if_drop_alldrouters(struct ospf
*top
, struct prefix
*p
,
106 ret
= setsockopt_ipv4_multicast(top
->fd
, IP_DROP_MEMBERSHIP
,
107 p
->u
.prefix4
, htonl(OSPF_ALLDROUTERS
),
110 flog_err(EC_LIB_SOCKET
,
111 "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s",
112 top
->fd
, &p
->u
.prefix4
, ifindex
,
113 safe_strerror(errno
));
116 "interface %pI4 [%u] leave AllDRouters Multicast group.",
117 &p
->u
.prefix4
, ifindex
);
122 int ospf_if_ipmulticast(struct ospf
*top
, struct prefix
*p
, ifindex_t ifindex
)
127 /* Prevent receiving self-origined multicast packets. */
128 ret
= setsockopt_ipv4_multicast_loop(top
->fd
, 0);
130 flog_err(EC_LIB_SOCKET
,
131 "can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
132 top
->fd
, safe_strerror(errno
));
134 /* Explicitly set multicast ttl to 1 -- endo. */
137 ret
= setsockopt(top
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, (void *)&val
,
140 flog_err(EC_LIB_SOCKET
,
141 "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
142 top
->fd
, safe_strerror(errno
));
144 /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
145 * packet out of ifindex. Below would be used Non Linux system.
147 ret
= setsockopt_ipv4_multicast_if(top
->fd
, p
->u
.prefix4
, ifindex
);
149 flog_err(EC_LIB_SOCKET
,
150 "can't setsockopt IP_MULTICAST_IF(fd %d, addr %pI4, ifindex %u): %s",
151 top
->fd
, &p
->u
.prefix4
, ifindex
,
152 safe_strerror(errno
));
158 int ospf_sock_init(struct ospf
*ospf
)
162 int bufsize
= (8 * 1024 * 1024);
164 /* silently ignore. already done */
168 if (ospf
->vrf_id
== VRF_UNKNOWN
) {
169 /* silently return since VRF is not ready */
172 frr_with_privs(&ospfd_privs
) {
173 ospf_sock
= vrf_socket(AF_INET
, SOCK_RAW
, IPPROTO_OSPFIGP
,
174 ospf
->vrf_id
, ospf
->name
);
176 flog_err(EC_LIB_SOCKET
,
177 "ospf_read_sock_init: socket: %s",
178 safe_strerror(errno
));
183 /* we will include IP header with packet */
184 ret
= setsockopt(ospf_sock
, IPPROTO_IP
, IP_HDRINCL
, &hincl
,
187 flog_err(EC_LIB_SOCKET
,
188 "Can't set IP_HDRINCL option for fd %d: %s",
189 ospf_sock
, safe_strerror(errno
));
192 #elif defined(IPTOS_PREC_INTERNETCONTROL)
193 #warning "IP_HDRINCL not available on this system"
194 #warning "using IPTOS_PREC_INTERNETCONTROL"
195 ret
= setsockopt_ipv4_tos(ospf_sock
,
196 IPTOS_PREC_INTERNETCONTROL
);
198 flog_err(EC_LIB_SOCKET
,
199 "can't set sockopt IP_TOS %d to socket %d: %s",
200 tos
, ospf_sock
, safe_strerror(errno
));
203 #else /* !IPTOS_PREC_INTERNETCONTROL */
204 #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
205 flog_err(EC_LIB_UNAVAILABLE
, "IP_HDRINCL option not available");
206 #endif /* IP_HDRINCL */
208 ret
= setsockopt_ifindex(AF_INET
, ospf_sock
, 1);
211 flog_err(EC_LIB_SOCKET
,
212 "Can't set pktinfo option for fd %d",
216 setsockopt_so_sendbuf(ospf_sock
, bufsize
);
217 setsockopt_so_recvbuf(ospf_sock
, bufsize
);
219 ospf
->fd
= ospf_sock
;