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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 | * | |
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 | |
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" | |
31 | #include "privs.h" | |
32 | ||
33 | #include "ospfd/ospfd.h" | |
34 | #include "ospfd/ospf_network.h" | |
35 | #include "ospfd/ospf_interface.h" | |
36 | #include "ospfd/ospf_asbr.h" | |
37 | #include "ospfd/ospf_lsa.h" | |
38 | #include "ospfd/ospf_lsdb.h" | |
39 | #include "ospfd/ospf_neighbor.h" | |
40 | #include "ospfd/ospf_packet.h" | |
41 | #include "ospfd/ospf_dump.h" | |
42 | ||
43 | /* Join to the OSPF ALL SPF ROUTERS multicast group. */ | |
44 | int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p, | |
45 | ifindex_t ifindex) | |
46 | { | |
47 | int ret; | |
48 | ||
49 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
50 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
51 | ifindex); | |
52 | if (ret < 0) | |
53 | zlog_warn( | |
54 | "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, " | |
55 | "ifindex %u, AllSPFRouters): %s; perhaps a kernel limit " | |
56 | "on # of multicast group memberships has been exceeded?", | |
57 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
58 | safe_strerror(errno)); | |
59 | else { | |
60 | if (IS_DEBUG_OSPF_EVENT) | |
61 | zlog_debug("interface %s [%u] join AllSPFRouters Multicast group.", | |
62 | inet_ntoa(p->u.prefix4), ifindex); | |
63 | } | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
68 | int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p, | |
69 | ifindex_t ifindex) | |
70 | { | |
71 | int ret; | |
72 | ||
73 | ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP, | |
74 | p->u.prefix4, htonl(OSPF_ALLSPFROUTERS), | |
75 | ifindex); | |
76 | if (ret < 0) | |
77 | zlog_warn( | |
78 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, " | |
79 | "ifindex %u, AllSPFRouters): %s", | |
80 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
81 | safe_strerror(errno)); | |
82 | else { | |
83 | if (IS_DEBUG_OSPF_EVENT) | |
84 | zlog_debug("interface %s [%u] leave AllSPFRouters Multicast group.", | |
85 | inet_ntoa(p->u.prefix4), ifindex); | |
86 | } | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | /* Join to the OSPF ALL Designated ROUTERS multicast group. */ | |
92 | int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p, | |
93 | ifindex_t ifindex) | |
94 | { | |
95 | int ret; | |
96 | ||
97 | ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP, | |
98 | p->u.prefix4, htonl(OSPF_ALLDROUTERS), | |
99 | ifindex); | |
100 | if (ret < 0) | |
101 | zlog_warn( | |
102 | "can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, " | |
103 | "ifindex %u, AllDRouters): %s; perhaps a kernel limit " | |
104 | "on # of multicast group memberships has been exceeded?", | |
105 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
106 | safe_strerror(errno)); | |
107 | else | |
108 | zlog_debug( | |
109 | "interface %s [%u] join AllDRouters Multicast group.", | |
110 | inet_ntoa(p->u.prefix4), ifindex); | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
115 | int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p, | |
116 | ifindex_t ifindex) | |
117 | { | |
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) | |
124 | zlog_warn( | |
125 | "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, " | |
126 | "ifindex %u, AllDRouters): %s", | |
127 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
128 | safe_strerror(errno)); | |
129 | else | |
130 | zlog_debug( | |
131 | "interface %s [%u] leave AllDRouters Multicast group.", | |
132 | inet_ntoa(p->u.prefix4), ifindex); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex) | |
138 | { | |
139 | u_char val; | |
140 | int ret, len; | |
141 | ||
142 | /* Prevent receiving self-origined multicast packets. */ | |
143 | ret = setsockopt_ipv4_multicast_loop(top->fd, 0); | |
144 | if (ret < 0) | |
145 | zlog_warn("can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s", | |
146 | top->fd, safe_strerror(errno)); | |
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) | |
154 | zlog_warn("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s", | |
155 | top->fd, safe_strerror(errno)); | |
156 | #ifndef GNU_LINUX | |
157 | /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send | |
158 | * packet out of ifindex. Below would be used Non Linux system. | |
159 | */ | |
160 | ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex); | |
161 | if (ret < 0) | |
162 | zlog_warn( | |
163 | "can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, " | |
164 | "ifindex %u): %s", | |
165 | top->fd, inet_ntoa(p->u.prefix4), ifindex, | |
166 | safe_strerror(errno)); | |
167 | #endif | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | int ospf_bind_vrfdevice(struct ospf *ospf, int ospf_sock) | |
173 | { | |
174 | int ret = 0; | |
175 | ||
176 | #ifdef SO_BINDTODEVICE | |
177 | ||
178 | if (ospf && ospf->vrf_id != VRF_DEFAULT && | |
179 | ospf->vrf_id != VRF_UNKNOWN) { | |
180 | ret = setsockopt(ospf_sock, SOL_SOCKET, SO_BINDTODEVICE, | |
181 | ospf->name, | |
182 | strlen(ospf->name)); | |
183 | if (ret < 0) { | |
184 | int save_errno = errno; | |
185 | ||
186 | zlog_warn("%s: Could not setsockopt SO_BINDTODEVICE %s", | |
187 | __PRETTY_FUNCTION__, | |
188 | safe_strerror(save_errno)); | |
189 | } | |
190 | ||
191 | } | |
192 | #endif | |
193 | return ret; | |
194 | } | |
195 | ||
196 | int ospf_sock_init(struct ospf *ospf) | |
197 | { | |
198 | int ospf_sock; | |
199 | int ret, hincl = 1; | |
200 | int bufsize = (8 * 1024 * 1024); | |
201 | ||
202 | if (ospfd_privs.change(ZPRIVS_RAISE)) { | |
203 | zlog_err("ospf_sock_init: could not raise privs, %s", | |
204 | safe_strerror(errno)); | |
205 | } | |
206 | ||
207 | ospf_sock = socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP); | |
208 | if (ospf_sock < 0) { | |
209 | int save_errno = errno; | |
210 | ||
211 | if (ospfd_privs.change(ZPRIVS_LOWER)) | |
212 | zlog_err("ospf_sock_init: could not lower privs, %s", | |
213 | safe_strerror(errno)); | |
214 | zlog_err("ospf_read_sock_init: socket: %s", | |
215 | safe_strerror(save_errno)); | |
216 | exit(1); | |
217 | } | |
218 | ||
219 | ret = ospf_bind_vrfdevice(ospf, ospf_sock); | |
220 | if (ret < 0) { | |
221 | close(ospf_sock); | |
222 | goto out; | |
223 | } | |
224 | ||
225 | #ifdef IP_HDRINCL | |
226 | /* we will include IP header with packet */ | |
227 | ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, | |
228 | sizeof(hincl)); | |
229 | if (ret < 0) { | |
230 | int save_errno = errno; | |
231 | ||
232 | zlog_warn("Can't set IP_HDRINCL option for fd %d: %s", | |
233 | ospf_sock, safe_strerror(save_errno)); | |
234 | close(ospf_sock); | |
235 | goto out; | |
236 | } | |
237 | #elif defined(IPTOS_PREC_INTERNETCONTROL) | |
238 | #warning "IP_HDRINCL not available on this system" | |
239 | #warning "using IPTOS_PREC_INTERNETCONTROL" | |
240 | ret = setsockopt_ipv4_tos(ospf_sock, IPTOS_PREC_INTERNETCONTROL); | |
241 | if (ret < 0) { | |
242 | int save_errno = errno; | |
243 | ||
244 | zlog_warn("can't set sockopt IP_TOS %d to socket %d: %s", tos, | |
245 | ospf_sock, safe_strerror(save_errno)); | |
246 | close(ospf_sock); /* Prevent sd leak. */ | |
247 | goto out; | |
248 | } | |
249 | #else /* !IPTOS_PREC_INTERNETCONTROL */ | |
250 | #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL" | |
251 | zlog_warn("IP_HDRINCL option not available"); | |
252 | #endif /* IP_HDRINCL */ | |
253 | ||
254 | ret = setsockopt_ifindex(AF_INET, ospf_sock, 1); | |
255 | ||
256 | if (ret < 0) | |
257 | zlog_warn("Can't set pktinfo option for fd %d", ospf_sock); | |
258 | ||
259 | setsockopt_so_sendbuf(ospf_sock, bufsize); | |
260 | setsockopt_so_recvbuf(ospf_sock, bufsize); | |
261 | ||
262 | ospf->fd = ospf_sock; | |
263 | out: | |
264 | if (ospfd_privs.change(ZPRIVS_LOWER)) { | |
265 | zlog_err("ospf_sock_init: could not lower privs, %s", | |
266 | safe_strerror(errno)); | |
267 | } | |
268 | return ret; | |
269 | } |