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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/* $OpenBSD: hello.c,v 1.8 2005/06/13 08:22:39 claudio Exp $ */
/*
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <event.h>
#include "ospfd.h"
#include "ospf.h"
#include "log.h"
#include "ospfe.h"
extern struct ospfd_conf *oeconf;
/* hello packet handling */
int
send_hello(struct iface *iface)
{
struct sockaddr_in dst;
struct hello_hdr hello;
struct nbr *nbr;
struct buf *buf;
int ret;
/* XXX READ_BUF_SIZE */
if ((buf = buf_dynamic(PKG_DEF_SIZE, READ_BUF_SIZE)) == NULL)
fatal("send_hello");
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
inet_aton(AllSPFRouters, &dst.sin_addr);
break;
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
/* XXX not supported */
break;
case IF_TYPE_VIRTUALLINK:
dst.sin_addr = iface->dst;
break;
default:
fatalx("send_hello: unknown interface type");
}
/* OSPF header */
if (gen_ospf_hdr(buf, iface, PACKET_TYPE_HELLO))
goto fail;
/* hello header */
hello.mask = iface->mask.s_addr;
hello.hello_interval = htons(iface->hello_interval);
hello.opts = oeconf->options;
hello.rtr_priority = iface->priority;
hello.rtr_dead_interval = htonl(iface->dead_interval);
if (iface->dr) {
hello.d_rtr = iface->dr->addr.s_addr;
iface->self->dr.s_addr = iface->dr->addr.s_addr;
} else
hello.d_rtr = 0;
if (iface->bdr) {
hello.bd_rtr = iface->bdr->addr.s_addr;
iface->self->bdr.s_addr = iface->bdr->addr.s_addr;
} else
hello.bd_rtr = 0;
if (buf_add(buf, &hello, sizeof(hello)))
goto fail;
/* active neighbor(s) */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if ((nbr->state >= NBR_STA_INIT) && (nbr != iface->self))
if (buf_add(buf, &nbr->id, sizeof(nbr->id)))
goto fail;
}
/* update authentication and calculate checksum */
if (auth_gen(buf, iface))
goto fail;
ret = send_packet(iface, buf->buf, buf->wpos, &dst);
buf_free(buf);
return (ret);
fail:
log_warn("send_hello");
buf_free(buf);
return (-1);
}
void
recv_hello(struct iface *iface, struct in_addr src, u_int32_t rtr_id, char *buf,
u_int16_t len)
{
struct hello_hdr hello;
struct nbr *nbr = NULL;
u_int32_t nbr_id;
int twoway = 0, nbr_change = 0;
if (len < sizeof(hello) && (len & 0x03)) {
log_warnx("recv_hello: bad packet size, interface %s",
iface->name);
return;
}
memcpy(&hello, buf, sizeof(hello));
buf += sizeof(hello);
len -= sizeof(hello);
if (iface->type != IF_TYPE_POINTOPOINT &&
iface->type != IF_TYPE_VIRTUALLINK)
if (hello.mask != iface->mask.s_addr) {
log_warnx("recv_hello: invalid netmask, interface %s",
iface->name);
return;
}
if (ntohs(hello.hello_interval) != iface->hello_interval) {
log_warnx("recv_hello: invalid hello-interval %d, "
"interface %s", ntohs(hello.hello_interval),
iface->name);
return;
}
if (ntohl(hello.rtr_dead_interval) != iface->dead_interval) {
log_warnx("recv_hello: invalid router-dead-interval %d, "
"interface %s", ntohl(hello.rtr_dead_interval),
iface->name);
return;
}
if ((hello.opts & OSPF_OPTION_E && iface->area->stub) ||
((hello.opts & OSPF_OPTION_E) == 0 && !iface->area->stub)) {
log_warnx("recv_hello: ExternalRoutingCapability mismatch, "
"interface %s", iface->name);
return;
}
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_VIRTUALLINK:
/* match router-id */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr == iface->self)
continue;
if (nbr->id.s_addr == rtr_id)
break;
}
break;
case IF_TYPE_BROADCAST:
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
/* match src IP */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr == iface->self)
continue;
if (nbr->addr.s_addr == src.s_addr)
break;
}
break;
default:
fatalx("recv_hello: unknown interface type");
}
if (!nbr)
nbr = nbr_new(rtr_id, iface, 0);
/* actually the neighbor address shouldn't be stored on virtual links */
nbr->addr.s_addr = src.s_addr;
nbr->options = hello.opts;
nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
while (len >= sizeof(nbr_id)) {
memcpy(&nbr_id, buf, sizeof(nbr_id));
if (nbr_id == iface->rtr_id.s_addr) {
/* seen myself */
if (nbr->state < NBR_STA_XSTRT)
twoway = 1;
break;
}
buf += sizeof(nbr_id);
len -= sizeof(nbr_id);
}
if (len == 0) {
nbr_fsm(nbr, NBR_EVT_1_WAY_RCVD);
/* set neighbor parameters */
nbr->dr.s_addr = hello.d_rtr;
nbr->bdr.s_addr = hello.bd_rtr;
nbr->priority = hello.rtr_priority;
return;
}
if (nbr->priority != hello.rtr_priority) {
nbr->priority = hello.rtr_priority;
nbr_change = 1;
}
if (iface->state & IF_STA_WAITING &&
((hello.d_rtr == nbr->addr.s_addr && hello.bd_rtr == 0) ||
hello.bd_rtr == nbr->addr.s_addr))
if_fsm(iface, IF_EVT_BACKUP_SEEN);
if ((nbr->addr.s_addr == nbr->dr.s_addr &&
nbr->addr.s_addr != hello.d_rtr) ||
(nbr->addr.s_addr != nbr->dr.s_addr &&
nbr->addr.s_addr == hello.d_rtr))
/* neighbor changed from or to DR */
nbr_change = 1;
if ((nbr->addr.s_addr == nbr->bdr.s_addr &&
nbr->addr.s_addr != hello.bd_rtr) ||
(nbr->addr.s_addr != nbr->bdr.s_addr &&
nbr->addr.s_addr == hello.bd_rtr))
/* neighbor changed from or to BDR */
nbr_change = 1;
nbr->dr.s_addr = hello.d_rtr;
nbr->bdr.s_addr = hello.bd_rtr;
if (twoway) {
/*
* event 2 way received needs to be delayed after the
* interface neighbor change check else the DR and BDR
* may not be set correctly.
*/
nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD);
}
if (nbr_change)
if_fsm(iface, IF_EVT_NBR_CHNG);
/* TODO NBMA needs some special handling */
return;
}
|
