1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* OSPF network related functions
* Copyright (C) 1999 Toshiaki Takada
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "thread.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "sockunion.h"
#include "log.h"
#include "sockopt.h"
#include "privs.h"
extern struct zebra_privs_t ospfd_privs;
#include "ospfd/ospfd.h"
#include "ospfd/ospf_network.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_packet.h"
/* Join to the OSPF ALL SPF ROUTERS multicast group. */
int
ospf_if_add_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (AllSPFRouters): %s",
strerror (errno));
else
zlog_info ("interface %s join AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4));
return ret;
}
int
ospf_if_drop_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn("can't setsockopt IP_DROP_MEMBERSHIP (AllSPFRouters): %s",
strerror (errno));
else
zlog_info ("interface %s leave AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4));
return ret;
}
/* Join to the OSPF ALL Designated ROUTERS multicast group. */
int
ospf_if_add_alldrouters (struct ospf *top, struct prefix *p, unsigned int
ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (AllDRouters): %s",
strerror (errno));
else
zlog_info ("interface %s join AllDRouters Multicast group.",
inet_ntoa (p->u.prefix4));
return ret;
}
int
ospf_if_drop_alldrouters (struct ospf *top, struct prefix *p, unsigned int
ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (AllDRouters): %s",
strerror (errno));
else
zlog_info ("interface %s leave AllDRouters Multicast group.",
inet_ntoa (p->u.prefix4));
return ret;
}
int
ospf_if_ipmulticast (struct ospf *top, struct prefix *p, unsigned int ifindex)
{
u_char val;
int ret, len;
val = 0;
len = sizeof (val);
/* Prevent receiving self-origined multicast packets. */
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_LOOP(0): %s", strerror (errno));
/* Explicitly set multicast ttl to 1 -- endo. */
val = 1;
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_TTL(1): %s", strerror (errno));
ret = setsockopt_multicast_ipv4 (top->fd, IP_MULTICAST_IF,
p->u.prefix4, 0, ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_IF: %s", strerror (errno));
return ret;
}
int
ospf_sock_init (void)
{
int ospf_sock;
int ret, tos, hincl = 1;
if ( ospfd_privs.change (ZPRIVS_RAISE) )
zlog_err ("ospf_sock_init: could not raise privs, %s",
strerror (errno) );
ospf_sock = socket (AF_INET, SOCK_RAW, IPPROTO_OSPFIGP);
if (ospf_sock < 0)
{
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
zlog_err ("ospf_read_sock_init: socket: %s", strerror (errno));
exit(-1);
}
/* Set precedence field. */
#ifdef IPTOS_PREC_INTERNETCONTROL
tos = IPTOS_PREC_INTERNETCONTROL;
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_TOS,
(char *) &tos, sizeof (int));
if (ret < 0)
{
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
zlog_warn ("can't set sockopt IP_TOS %d to socket %d", tos, ospf_sock);
close (ospf_sock); /* Prevent sd leak. */
return ret;
}
#endif /* IPTOS_PREC_INTERNETCONTROL */
/* we will include IP header with packet */
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof (hincl));
if (ret < 0)
{
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
zlog_warn ("Can't set IP_HDRINCL option");
}
#if defined (IP_PKTINFO)
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_PKTINFO, &hincl, sizeof (hincl));
if (ret < 0)
{
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
zlog_warn ("Can't set IP_PKTINFO option");
}
#elif defined (IP_RECVIF)
ret = setsockopt (ospf_sock, IPPROTO_IP, IP_RECVIF, &hincl, sizeof (hincl));
if (ret < 0)
{
if ( ospfd_privs.change (ZPRIVS_LOWER) )
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
zlog_warn ("Can't set IP_RECVIF option");
}
#else
#warning "cannot be able to receive link information on this OS"
#endif
if (ospfd_privs.change (ZPRIVS_LOWER))
{
zlog_err ("ospf_sock_init: could not lower privs, %s",
strerror (errno) );
}
return ospf_sock;
}
|
