]>
Commit | Line | Data |
---|---|---|
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, |
96b663a3 MS |
56 | "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?", |
57 | top->fd, &p->u.prefix4, ifindex, | |
ade6974d | 58 | safe_strerror(errno)); |
05ba78e4 CS |
59 | else { |
60 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 | 61 | zlog_debug( |
96b663a3 MS |
62 | "interface %pI4 [%u] join AllSPFRouters Multicast group.", |
63 | &p->u.prefix4, ifindex); | |
05ba78e4 | 64 | } |
d62a17ae | 65 | |
66 | return ret; | |
718e3744 | 67 | } |
68 | ||
d62a17ae | 69 | int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p, |
70 | ifindex_t ifindex) | |
718e3744 | 71 | { |
d62a17ae | 72 | int ret; |
73 | ||
74 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
75 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
76 | ifindex); | |
77 | if (ret < 0) | |
450971aa | 78 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
79 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s", |
80 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 81 | safe_strerror(errno)); |
05ba78e4 CS |
82 | else { |
83 | if (IS_DEBUG_OSPF_EVENT) | |
996c9314 | 84 | zlog_debug( |
96b663a3 MS |
85 | "interface %pI4 [%u] leave AllSPFRouters Multicast group.", |
86 | &p->u.prefix4, ifindex); | |
05ba78e4 | 87 | } |
d62a17ae | 88 | |
89 | return ret; | |
718e3744 | 90 | } |
91 | ||
92 | /* Join to the OSPF ALL Designated ROUTERS multicast group. */ | |
d62a17ae | 93 | int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p, |
94 | ifindex_t ifindex) | |
718e3744 | 95 | { |
d62a17ae | 96 | int ret; |
97 | ||
98 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
99 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
100 | ifindex); | |
101 | if (ret < 0) | |
ade6974d | 102 | flog_err( |
450971aa | 103 | EC_LIB_SOCKET, |
96b663a3 MS |
104 | "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?", |
105 | top->fd, &p->u.prefix4, ifindex, | |
ade6974d | 106 | safe_strerror(errno)); |
d62a17ae | 107 | else |
108 | zlog_debug( | |
96b663a3 MS |
109 | "interface %pI4 [%u] join AllDRouters Multicast group.", |
110 | &p->u.prefix4, ifindex); | |
d62a17ae | 111 | |
112 | return ret; | |
718e3744 | 113 | } |
114 | ||
d62a17ae | 115 | int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p, |
116 | ifindex_t ifindex) | |
718e3744 | 117 | { |
d62a17ae | 118 | int ret; |
119 | ||
120 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
121 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
122 | ifindex); | |
123 | if (ret < 0) | |
450971aa | 124 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
125 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s", |
126 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 127 | safe_strerror(errno)); |
d62a17ae | 128 | else |
129 | zlog_debug( | |
96b663a3 MS |
130 | "interface %pI4 [%u] leave AllDRouters Multicast group.", |
131 | &p->u.prefix4, ifindex); | |
d62a17ae | 132 | |
133 | return ret; | |
718e3744 | 134 | } |
135 | ||
d62a17ae | 136 | int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex) |
718e3744 | 137 | { |
d7c0a89a | 138 | uint8_t val; |
d62a17ae | 139 | int ret, len; |
140 | ||
141 | /* Prevent receiving self-origined multicast packets. */ | |
142 | ret = setsockopt_ipv4_multicast_loop(top->fd, 0); | |
143 | if (ret < 0) | |
450971aa | 144 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
145 | "can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s", |
146 | top->fd, safe_strerror(errno)); | |
d62a17ae | 147 | |
148 | /* Explicitly set multicast ttl to 1 -- endo. */ | |
149 | val = 1; | |
150 | len = sizeof(val); | |
151 | ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, | |
152 | len); | |
153 | if (ret < 0) | |
450971aa | 154 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
155 | "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s", |
156 | top->fd, safe_strerror(errno)); | |
e1b18df1 CS |
157 | #ifndef GNU_LINUX |
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. | |
160 | */ | |
161 | ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex); | |
162 | if (ret < 0) | |
450971aa | 163 | flog_err(EC_LIB_SOCKET, |
96b663a3 MS |
164 | "can't setsockopt IP_MULTICAST_IF(fd %d, addr %pI4, ifindex %u): %s", |
165 | top->fd, &p->u.prefix4, ifindex, | |
abcc171c | 166 | safe_strerror(errno)); |
e1b18df1 | 167 | #endif |
d62a17ae | 168 | |
e7503eab CS |
169 | return ret; |
170 | } | |
171 | ||
e7503eab | 172 | int ospf_sock_init(struct ospf *ospf) |
718e3744 | 173 | { |
d62a17ae | 174 | int ospf_sock; |
175 | int ret, hincl = 1; | |
176 | int bufsize = (8 * 1024 * 1024); | |
177 | ||
3c0eb8fa PG |
178 | /* silently ignore. already done */ |
179 | if (ospf->fd > 0) | |
180 | return -1; | |
181 | ||
182 | if (ospf->vrf_id == VRF_UNKNOWN) { | |
183 | /* silently return since VRF is not ready */ | |
184 | return -1; | |
185 | } | |
0cf6db21 | 186 | frr_with_privs(&ospfd_privs) { |
6bb30c2c DL |
187 | ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP, |
188 | ospf->vrf_id, ospf->name); | |
189 | if (ospf_sock < 0) { | |
450971aa | 190 | flog_err(EC_LIB_SOCKET, |
abcc171c | 191 | "ospf_read_sock_init: socket: %s", |
6bb30c2c DL |
192 | safe_strerror(errno)); |
193 | exit(1); | |
194 | } | |
d62a17ae | 195 | |
5bd4189c | 196 | #ifdef IP_HDRINCL |
6bb30c2c DL |
197 | /* we will include IP header with packet */ |
198 | ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, | |
199 | sizeof(hincl)); | |
200 | if (ret < 0) { | |
450971aa | 201 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
202 | "Can't set IP_HDRINCL option for fd %d: %s", |
203 | ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
204 | break; |
205 | } | |
d62a17ae | 206 | #elif defined(IPTOS_PREC_INTERNETCONTROL) |
5bd4189c | 207 | #warning "IP_HDRINCL not available on this system" |
208 | #warning "using IPTOS_PREC_INTERNETCONTROL" | |
6bb30c2c DL |
209 | ret = setsockopt_ipv4_tos(ospf_sock, |
210 | IPTOS_PREC_INTERNETCONTROL); | |
211 | if (ret < 0) { | |
450971aa | 212 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
213 | "can't set sockopt IP_TOS %d to socket %d: %s", |
214 | tos, ospf_sock, safe_strerror(errno)); | |
6bb30c2c DL |
215 | break; |
216 | } | |
5bd4189c | 217 | #else /* !IPTOS_PREC_INTERNETCONTROL */ |
218 | #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL" | |
1c50c1c0 | 219 | flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available"); |
5bd4189c | 220 | #endif /* IP_HDRINCL */ |
718e3744 | 221 | |
6bb30c2c | 222 | ret = setsockopt_ifindex(AF_INET, ospf_sock, 1); |
ac191232 | 223 | |
6bb30c2c | 224 | if (ret < 0) |
450971aa | 225 | flog_err(EC_LIB_SOCKET, |
abcc171c DS |
226 | "Can't set pktinfo option for fd %d", |
227 | ospf_sock); | |
6bb30c2c | 228 | } |
e7503eab | 229 | |
338b8e91 RW |
230 | setsockopt_so_sendbuf(ospf_sock, bufsize); |
231 | setsockopt_so_recvbuf(ospf_sock, bufsize); | |
232 | ||
e7503eab | 233 | ospf->fd = ospf_sock; |
e7503eab | 234 | return ret; |
718e3744 | 235 | } |