Line data Source code
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 : #include "lib_errors.h"
33 :
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"
42 : #include "ospfd/ospf_dump.h"
43 :
44 : /* Join to the OSPF ALL SPF ROUTERS multicast group. */
45 18 : int ospf_if_add_allspfrouters(struct ospf *top, struct prefix *p,
46 : ifindex_t ifindex)
47 : {
48 18 : int ret;
49 :
50 18 : ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
51 : p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
52 : ifindex);
53 18 : if (ret < 0)
54 0 : flog_err(
55 : EC_LIB_SOCKET,
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,
58 : safe_strerror(errno));
59 : else {
60 18 : if (IS_DEBUG_OSPF_EVENT)
61 18 : zlog_debug(
62 : "interface %pI4 [%u] join AllSPFRouters Multicast group.",
63 : &p->u.prefix4, ifindex);
64 : }
65 :
66 18 : return ret;
67 : }
68 :
69 18 : int ospf_if_drop_allspfrouters(struct ospf *top, struct prefix *p,
70 : ifindex_t ifindex)
71 : {
72 18 : int ret;
73 :
74 18 : ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
75 : p->u.prefix4, htonl(OSPF_ALLSPFROUTERS),
76 : ifindex);
77 18 : if (ret < 0)
78 0 : flog_err(EC_LIB_SOCKET,
79 : "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllSPFRouters): %s",
80 : top->fd, &p->u.prefix4, ifindex,
81 : safe_strerror(errno));
82 : else {
83 18 : if (IS_DEBUG_OSPF_EVENT)
84 18 : zlog_debug(
85 : "interface %pI4 [%u] leave AllSPFRouters Multicast group.",
86 : &p->u.prefix4, ifindex);
87 : }
88 :
89 18 : return ret;
90 : }
91 :
92 : /* Join to the OSPF ALL Designated ROUTERS multicast group. */
93 9 : int ospf_if_add_alldrouters(struct ospf *top, struct prefix *p,
94 : ifindex_t ifindex)
95 : {
96 9 : int ret;
97 :
98 9 : ret = setsockopt_ipv4_multicast(top->fd, IP_ADD_MEMBERSHIP,
99 : p->u.prefix4, htonl(OSPF_ALLDROUTERS),
100 : ifindex);
101 9 : if (ret < 0)
102 0 : flog_err(
103 : EC_LIB_SOCKET,
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,
106 : safe_strerror(errno));
107 : else {
108 9 : if (IS_DEBUG_OSPF_EVENT)
109 9 : zlog_debug(
110 : "interface %pI4 [%u] join AllDRouters Multicast group.",
111 : &p->u.prefix4, ifindex);
112 : }
113 9 : return ret;
114 : }
115 :
116 9 : int ospf_if_drop_alldrouters(struct ospf *top, struct prefix *p,
117 : ifindex_t ifindex)
118 : {
119 9 : int ret;
120 :
121 9 : ret = setsockopt_ipv4_multicast(top->fd, IP_DROP_MEMBERSHIP,
122 : p->u.prefix4, htonl(OSPF_ALLDROUTERS),
123 : ifindex);
124 9 : if (ret < 0)
125 0 : flog_err(EC_LIB_SOCKET,
126 : "can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %pI4, ifindex %u, AllDRouters): %s",
127 : top->fd, &p->u.prefix4, ifindex,
128 : safe_strerror(errno));
129 : else
130 9 : zlog_debug(
131 : "interface %pI4 [%u] leave AllDRouters Multicast group.",
132 : &p->u.prefix4, ifindex);
133 :
134 9 : return ret;
135 : }
136 :
137 193 : int ospf_if_ipmulticast(struct ospf *top, struct prefix *p, ifindex_t ifindex)
138 : {
139 193 : uint8_t val;
140 193 : int ret, len;
141 :
142 : /* Prevent receiving self-origined multicast packets. */
143 193 : ret = setsockopt_ipv4_multicast_loop(top->fd, 0);
144 193 : if (ret < 0)
145 0 : flog_err(EC_LIB_SOCKET,
146 : "can't setsockopt IP_MULTICAST_LOOP(0) for fd %d: %s",
147 : top->fd, safe_strerror(errno));
148 :
149 : /* Explicitly set multicast ttl to 1 -- endo. */
150 193 : val = 1;
151 193 : len = sizeof(val);
152 193 : ret = setsockopt(top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val,
153 : len);
154 193 : if (ret < 0)
155 0 : flog_err(EC_LIB_SOCKET,
156 : "can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
157 : top->fd, safe_strerror(errno));
158 : #ifndef GNU_LINUX
159 : /* For GNU LINUX ospf_write uses IP_PKTINFO, in_pktinfo to send
160 : * packet out of ifindex. Below would be used Non Linux system.
161 : */
162 : ret = setsockopt_ipv4_multicast_if(top->fd, p->u.prefix4, ifindex);
163 : if (ret < 0)
164 : flog_err(EC_LIB_SOCKET,
165 : "can't setsockopt IP_MULTICAST_IF(fd %d, addr %pI4, ifindex %u): %s",
166 : top->fd, &p->u.prefix4, ifindex,
167 : safe_strerror(errno));
168 : #endif
169 :
170 193 : return ret;
171 : }
172 :
173 4 : int ospf_sock_init(struct ospf *ospf)
174 : {
175 4 : int ospf_sock;
176 4 : int ret, hincl = 1;
177 4 : int bufsize = (8 * 1024 * 1024);
178 :
179 : /* silently ignore. already done */
180 4 : if (ospf->fd > 0)
181 : return -1;
182 :
183 4 : if (ospf->vrf_id == VRF_UNKNOWN) {
184 : /* silently return since VRF is not ready */
185 : return -1;
186 : }
187 8 : frr_with_privs(&ospfd_privs) {
188 8 : ospf_sock = vrf_socket(AF_INET, SOCK_RAW, IPPROTO_OSPFIGP,
189 4 : ospf->vrf_id, ospf->name);
190 4 : if (ospf_sock < 0) {
191 0 : flog_err(EC_LIB_SOCKET,
192 : "ospf_read_sock_init: socket: %s",
193 : safe_strerror(errno));
194 0 : return -1;
195 : }
196 :
197 : #ifdef IP_HDRINCL
198 : /* we will include IP header with packet */
199 4 : ret = setsockopt(ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl,
200 : sizeof(hincl));
201 4 : if (ret < 0) {
202 0 : flog_err(EC_LIB_SOCKET,
203 : "Can't set IP_HDRINCL option for fd %d: %s",
204 : ospf_sock, safe_strerror(errno));
205 0 : break;
206 : }
207 : #elif defined(IPTOS_PREC_INTERNETCONTROL)
208 : #warning "IP_HDRINCL not available on this system"
209 : #warning "using IPTOS_PREC_INTERNETCONTROL"
210 : ret = setsockopt_ipv4_tos(ospf_sock,
211 : IPTOS_PREC_INTERNETCONTROL);
212 : if (ret < 0) {
213 : flog_err(EC_LIB_SOCKET,
214 : "can't set sockopt IP_TOS %d to socket %d: %s",
215 : tos, ospf_sock, safe_strerror(errno));
216 : break;
217 : }
218 : #else /* !IPTOS_PREC_INTERNETCONTROL */
219 : #warning "IP_HDRINCL not available, nor is IPTOS_PREC_INTERNETCONTROL"
220 : flog_err(EC_LIB_UNAVAILABLE, "IP_HDRINCL option not available");
221 : #endif /* IP_HDRINCL */
222 :
223 4 : ret = setsockopt_ifindex(AF_INET, ospf_sock, 1);
224 :
225 4 : if (ret < 0)
226 0 : flog_err(EC_LIB_SOCKET,
227 : "Can't set pktinfo option for fd %d",
228 : ospf_sock);
229 : }
230 :
231 4 : setsockopt_so_sendbuf(ospf_sock, bufsize);
232 4 : setsockopt_so_recvbuf(ospf_sock, bufsize);
233 :
234 4 : ospf->fd = ospf_sock;
235 4 : return ret;
236 : }
|
