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718e3744 | 1 | /* |
2 | * OSPF network related functions | |
3 | * Copyright (C) 1999 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
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 | |
10 | * later version. | |
11 | * | |
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. | |
16 | * | |
896014f4 DL |
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 | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "thread.h" | |
25 | #include "linklist.h" | |
26 | #include "prefix.h" | |
27 | #include "if.h" | |
28 | #include "sockunion.h" | |
29 | #include "log.h" | |
30 | #include "sockopt.h" | |
edd7c245 | 31 | #include "privs.h" |
313d7993 | 32 | #include "lib_errors.h" |
edd7c245 | 33 | |
718e3744 | 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" | |
05ba78e4 | 42 | #include "ospfd/ospf_dump.h" |
edd7c245 | 43 | |
718e3744 | 44 | /* Join to the OSPF ALL SPF ROUTERS multicast group. */ |
d62a17ae | 45 | int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p, |
46 | ifindex_t ifindex) | |
718e3744 | 47 | { |
d62a17ae | 48 | int ret; |
49 | ||
50 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
51 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
52 | ifindex); | |
53 | if (ret < 0) | |
ade6974d | 54 | flog_err( |
450971aa | 55 | EC_LIB_SOCKET, |
ade6974d QY |
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)); | |
05ba78e4 CS |
61 | else { |
62 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 LB |
63 | zlog_debug( |
64 | "interface %s [%u] join AllSPFRouters Multicast group.", | |
65 | inet_ntoa(p->u.prefix4), ifindex); | |
05ba78e4 | 66 | } |
d62a17ae | 67 | |
68 | return ret; | |
718e3744 | 69 | } |
70 | ||
d62a17ae | 71 | int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p, |
72 | ifindex_t ifindex) | |
718e3744 | 73 | { |
d62a17ae | 74 | int ret; |
75 | ||
76 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
77 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
78 | ifindex); | |
79 | if (ret < 0) | |
450971aa | 80 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
81 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, " |
82 | "ifindex %u, AllSPFRouters): %s", | |
83 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
84 | safe_strerror(errno)); | |
05ba78e4 CS |
85 | else { |
86 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 LB |
87 | zlog_debug( |
88 | "interface %s [%u] leave AllSPFRouters Multicast group.", | |
89 | inet_ntoa(p->u.prefix4), ifindex); | |
05ba78e4 | 90 | } |
d62a17ae | 91 | |
92 | return ret; | |
718e3744 | 93 | } |
94 | ||
95 | /* Join to the OSPF ALL Designated ROUTERS multicast group. */ | |
d62a17ae | 96 | int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p, |
97 | ifindex_t ifindex) | |
718e3744 | 98 | { |
d62a17ae | 99 | int ret; |
100 | ||
101 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
102 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
103 | ifindex); | |
104 | if (ret < 0) | |
ade6974d | 105 | flog_err( |
450971aa | 106 | EC_LIB_SOCKET, |
ade6974d QY |
107 | "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, " |
108 | "ifindex %u, AllDRouters): %s; perhaps a kernel limit " | |
109 | "on # of multicast group memberships has been exceeded?", | |
110 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
111 | safe_strerror(errno)); | |
d62a17ae | 112 | else |
113 | zlog_debug( | |
114 | "interface %s [%u] join AllDRouters Multicast group.", | |
115 | inet_ntoa(p->u.prefix4), ifindex); | |
116 | ||
117 | return ret; | |
718e3744 | 118 | } |
119 | ||
d62a17ae | 120 | int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p, |
121 | ifindex_t ifindex) | |
718e3744 | 122 | { |
d62a17ae | 123 | int ret; |
124 | ||
125 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
126 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
127 | ifindex); | |
128 | if (ret < 0) | |
450971aa | 129 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
130 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, " |
131 | "ifindex %u, AllDRouters): %s", | |
132 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
133 | safe_strerror(errno)); | |
d62a17ae | 134 | else |
135 | zlog_debug( | |
136 | "interface %s [%u] leave AllDRouters Multicast group.", | |
137 | inet_ntoa(p->u.prefix4), ifindex); | |
138 | ||
139 | return ret; | |
718e3744 | 140 | } |
141 | ||
d62a17ae | 142 | int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex) |
718e3744 | 143 | { |
d7c0a89a | 144 | uint8_t val; |
d62a17ae | 145 | int ret, len; |
146 | ||
147 | /* Prevent receiving self-origined multicast packets. */ | |
148 | ret = setsockopt_ipv4_multicast_loop(top->fd, 0); | |
149 | if (ret < 0) | |
450971aa | 150 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
151 | "can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s", |
152 | top->fd, safe_strerror(errno)); | |
d62a17ae | 153 | |
154 | /* Explicitly set multicast ttl to 1 -- endo. */ | |
155 | val = 1; | |
156 | len = sizeof(val); | |
157 | ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, | |
158 | len); | |
159 | if (ret < 0) | |
450971aa | 160 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
161 | "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s", |
162 | top->fd, safe_strerror(errno)); | |
e1b18df1 CS |
163 | #ifndef GNU_LINUX |
164 | /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send | |
165 | * packet out of ifindex. Below would be used Non Linux system. | |
166 | */ | |
167 | ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex); | |
168 | if (ret < 0) | |
450971aa | 169 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
170 | "can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, " |
171 | "ifindex %u): %s", | |
172 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
173 | safe_strerror(errno)); | |
e1b18df1 | 174 | #endif |
d62a17ae | 175 | |
e7503eab CS |
176 | return ret; |
177 | } | |
178 | ||
e7503eab | 179 | int ospf_sock_init(struct ospf *ospf) |
718e3744 | 180 | { |
d62a17ae | 181 | int ospf_sock; |
182 | int ret, hincl = 1; | |
183 | int bufsize = (8 * 1024 * 1024); | |
184 | ||
3c0eb8fa PG |
185 | /* silently ignore. already done */ |
186 | if (ospf->fd > 0) | |
187 | return -1; | |
188 | ||
189 | if (ospf->vrf_id == VRF_UNKNOWN) { | |
190 | /* silently return since VRF is not ready */ | |
191 | return -1; | |
192 | } | |
0cf6db21 | 193 | frr_with_privs(&ospfd_privs) { |
6bb30c2c DL |
194 | ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP, |
195 | ospf->vrf_id, ospf->name); | |
196 | if (ospf_sock < 0) { | |
450971aa | 197 | flog_err(EC_LIB_SOCKET, |
abcc171c | 198 | "ospf_read_sock_init: socket: %s", |
6bb30c2c DL |
199 | safe_strerror(errno)); |
200 | exit(1); | |
201 | } | |
d62a17ae | 202 | |
5bd4189c | 203 | #ifdef IP_HDRINCL |
6bb30c2c DL |
204 | /* we will include IP header with packet */ |
205 | ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, | |
206 | sizeof(hincl)); | |
207 | if (ret < 0) { | |
450971aa | 208 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
209 | "Can't set IP_HDRINCL option for fd %d: %s", |
210 | ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
211 | close(ospf_sock); |
212 | break; | |
213 | } | |
d62a17ae | 214 | #elif defined(IPTOS_PREC_INTERNETCONTROL) |
5bd4189c | 215 | #warning "IP_HDRINCL not available on this system" |
216 | #warning "using IPTOS_PREC_INTERNETCONTROL" | |
6bb30c2c DL |
217 | ret = setsockopt_ipv4_tos(ospf_sock, |
218 | IPTOS_PREC_INTERNETCONTROL); | |
219 | if (ret < 0) { | |
450971aa | 220 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
221 | "can't set sockopt IP_TOS %d to socket %d: %s", |
222 | tos, ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
223 | close(ospf_sock); /* Prevent sd leak. */ |
224 | break; | |
225 | } | |
5bd4189c | 226 | #else /* !IPTOS_PREC_INTERNETCONTROL */ |
227 | #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL" | |
1c50c1c0 | 228 | flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available"); |
5bd4189c | 229 | #endif /* IP_HDRINCL */ |
718e3744 | 230 | |
6bb30c2c | 231 | ret = setsockopt_ifindex(AF_INET, ospf_sock, 1); |
ac191232 | 232 | |
6bb30c2c | 233 | if (ret < 0) |
450971aa | 234 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
235 | "Can't set pktinfo option for fd %d", |
236 | ospf_sock); | |
6bb30c2c | 237 | } |
e7503eab | 238 | |
338b8e91 RW |
239 | setsockopt_so_sendbuf(ospf_sock, bufsize); |
240 | setsockopt_so_recvbuf(ospf_sock, bufsize); | |
241 | ||
e7503eab | 242 | ospf->fd = ospf_sock; |
e7503eab | 243 | return ret; |
718e3744 | 244 | } |