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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
718e3744 | 2 | /* |
3 | * OSPF network related functions | |
4 | * Copyright (C) 1999 Toshiaki Takada | |
718e3744 | 5 | */ |
6 | ||
7 | #include <zebra.h> | |
8 | ||
cb37cb33 | 9 | #include "event.h" |
718e3744 | 10 | #include "linklist.h" |
11 | #include "prefix.h" | |
12 | #include "if.h" | |
13 | #include "sockunion.h" | |
14 | #include "log.h" | |
15 | #include "sockopt.h" | |
edd7c245 | 16 | #include "privs.h" |
313d7993 | 17 | #include "lib_errors.h" |
edd7c245 | 18 | |
718e3744 | 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" | |
05ba78e4 | 27 | #include "ospfd/ospf_dump.h" |
edd7c245 | 28 | |
718e3744 | 29 | /* Join to the OSPF ALL SPF ROUTERS multicast group. */ |
d62a17ae | 30 | int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p, |
31 | ifindex_t ifindex) | |
718e3744 | 32 | { |
d62a17ae | 33 | int ret; |
34 | ||
35 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
36 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
37 | ifindex); | |
38 | if (ret < 0) | |
ade6974d | 39 | flog_err( |
450971aa | 40 | EC_LIB_SOCKET, |
96b663a3 MS |
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, | |
ade6974d | 43 | safe_strerror(errno)); |
05ba78e4 CS |
44 | else { |
45 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 | 46 | zlog_debug( |
96b663a3 MS |
47 | "interface %pI4 [%u] join AllSPFRouters Multicast group.", |
48 | &p->u.prefix4, ifindex); | |
05ba78e4 | 49 | } |
d62a17ae | 50 | |
51 | return ret; | |
718e3744 | 52 | } |
53 | ||
d62a17ae | 54 | int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p, |
55 | ifindex_t ifindex) | |
718e3744 | 56 | { |
d62a17ae | 57 | int ret; |
58 | ||
59 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
60 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
61 | ifindex); | |
62 | if (ret < 0) | |
450971aa | 63 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
64 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s", |
65 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 66 | safe_strerror(errno)); |
05ba78e4 CS |
67 | else { |
68 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 | 69 | zlog_debug( |
96b663a3 MS |
70 | "interface %pI4 [%u] leave AllSPFRouters Multicast group.", |
71 | &p->u.prefix4, ifindex); | |
05ba78e4 | 72 | } |
d62a17ae | 73 | |
74 | return ret; | |
718e3744 | 75 | } |
76 | ||
77 | /* Join to the OSPF ALL Designated ROUTERS multicast group. */ | |
d62a17ae | 78 | int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p, |
79 | ifindex_t ifindex) | |
718e3744 | 80 | { |
d62a17ae | 81 | int ret; |
82 | ||
83 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
84 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
85 | ifindex); | |
86 | if (ret < 0) | |
ade6974d | 87 | flog_err( |
450971aa | 88 | EC_LIB_SOCKET, |
96b663a3 MS |
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, | |
ade6974d | 91 | safe_strerror(errno)); |
15e78e64 DS |
92 | else { |
93 | if (IS_DEBUG_OSPF_EVENT) | |
94 | zlog_debug( | |
95 | "interface %pI4 [%u] join AllDRouters Multicast group.", | |
96 | &p->u.prefix4, ifindex); | |
97 | } | |
d62a17ae | 98 | return ret; |
718e3744 | 99 | } |
100 | ||
d62a17ae | 101 | int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p, |
102 | ifindex_t ifindex) | |
718e3744 | 103 | { |
d62a17ae | 104 | int ret; |
105 | ||
106 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
107 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
108 | ifindex); | |
109 | if (ret < 0) | |
450971aa | 110 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
111 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s", |
112 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 113 | safe_strerror(errno)); |
d62a17ae | 114 | else |
115 | zlog_debug( | |
96b663a3 MS |
116 | "interface %pI4 [%u] leave AllDRouters Multicast group.", |
117 | &p->u.prefix4, ifindex); | |
d62a17ae | 118 | |
119 | return ret; | |
718e3744 | 120 | } |
121 | ||
d62a17ae | 122 | int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex) |
718e3744 | 123 | { |
d7c0a89a | 124 | uint8_t val; |
d62a17ae | 125 | int ret, len; |
126 | ||
127 | /* Prevent receiving self-origined multicast packets. */ | |
128 | ret = setsockopt_ipv4_multicast_loop(top->fd, 0); | |
129 | if (ret < 0) | |
450971aa | 130 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
131 | "can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s", |
132 | top->fd, safe_strerror(errno)); | |
d62a17ae | 133 | |
134 | /* Explicitly set multicast ttl to 1 -- endo. */ | |
135 | val = 1; | |
136 | len = sizeof(val); | |
137 | ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, | |
138 | len); | |
139 | if (ret < 0) | |
450971aa | 140 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
141 | "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s", |
142 | top->fd, safe_strerror(errno)); | |
e1b18df1 CS |
143 | #ifndef GNU_LINUX |
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. | |
146 | */ | |
147 | ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex); | |
148 | if (ret < 0) | |
450971aa | 149 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
150 | "can't setsockopt IP_MULTICAST_IF(fd %d, addr %pI4, ifindex %u): %s", |
151 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 152 | safe_strerror(errno)); |
e1b18df1 | 153 | #endif |
d62a17ae | 154 | |
e7503eab CS |
155 | return ret; |
156 | } | |
157 | ||
e7503eab | 158 | int ospf_sock_init(struct ospf *ospf) |
718e3744 | 159 | { |
d62a17ae | 160 | int ospf_sock; |
161 | int ret, hincl = 1; | |
162 | int bufsize = (8 * 1024 * 1024); | |
163 | ||
3c0eb8fa PG |
164 | /* silently ignore. already done */ |
165 | if (ospf->fd > 0) | |
166 | return -1; | |
167 | ||
168 | if (ospf->vrf_id == VRF_UNKNOWN) { | |
169 | /* silently return since VRF is not ready */ | |
170 | return -1; | |
171 | } | |
0cf6db21 | 172 | frr_with_privs(&ospfd_privs) { |
6bb30c2c DL |
173 | ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP, |
174 | ospf->vrf_id, ospf->name); | |
175 | if (ospf_sock < 0) { | |
450971aa | 176 | flog_err(EC_LIB_SOCKET, |
abcc171c | 177 | "ospf_read_sock_init: socket: %s", |
6bb30c2c | 178 | safe_strerror(errno)); |
95d7a42a | 179 | return -1; |
6bb30c2c | 180 | } |
d62a17ae | 181 | |
5bd4189c | 182 | #ifdef IP_HDRINCL |
6bb30c2c DL |
183 | /* we will include IP header with packet */ |
184 | ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, | |
185 | sizeof(hincl)); | |
186 | if (ret < 0) { | |
450971aa | 187 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
188 | "Can't set IP_HDRINCL option for fd %d: %s", |
189 | ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
190 | break; |
191 | } | |
d62a17ae | 192 | #elif defined(IPTOS_PREC_INTERNETCONTROL) |
5bd4189c | 193 | #warning "IP_HDRINCL not available on this system" |
194 | #warning "using IPTOS_PREC_INTERNETCONTROL" | |
6bb30c2c DL |
195 | ret = setsockopt_ipv4_tos(ospf_sock, |
196 | IPTOS_PREC_INTERNETCONTROL); | |
197 | if (ret < 0) { | |
450971aa | 198 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
199 | "can't set sockopt IP_TOS %d to socket %d: %s", |
200 | tos, ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
201 | break; |
202 | } | |
5bd4189c | 203 | #else /* !IPTOS_PREC_INTERNETCONTROL */ |
204 | #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL" | |
1c50c1c0 | 205 | flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available"); |
5bd4189c | 206 | #endif /* IP_HDRINCL */ |
718e3744 | 207 | |
6bb30c2c | 208 | ret = setsockopt_ifindex(AF_INET, ospf_sock, 1); |
ac191232 | 209 | |
6bb30c2c | 210 | if (ret < 0) |
450971aa | 211 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
212 | "Can't set pktinfo option for fd %d", |
213 | ospf_sock); | |
6bb30c2c | 214 | } |
e7503eab | 215 | |
338b8e91 RW |
216 | setsockopt_so_sendbuf(ospf_sock, bufsize); |
217 | setsockopt_so_recvbuf(ospf_sock, bufsize); | |
218 | ||
e7503eab | 219 | ospf->fd = ospf_sock; |
e7503eab | 220 | return ret; |
718e3744 | 221 | } |