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
|
/* $OpenBSD: hello.c,v 1.16 2010/05/26 13:56:08 nicm 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 "ospf6d.h"
#include "ospf6.h"
#include "log.h"
#include "ospfe.h"
extern struct ospfd_conf *oeconf;
/* hello packet handling */
int
send_hello(struct iface *iface)
{
struct in6_addr dst;
struct hello_hdr hello;
struct nbr *nbr;
struct ibuf *buf;
int ret;
u_int32_t opts;
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
case IF_TYPE_BROADCAST:
inet_pton(AF_INET6, AllSPFRouters, &dst);
break;
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
log_debug("send_hello: type %s not supported, interface %s",
if_type_name(iface->type), iface->name);
return (-1);
case IF_TYPE_VIRTUALLINK:
dst = iface->dst;
break;
default:
fatalx("send_hello: unknown interface type");
}
/* XXX IBUF_READ_SIZE */
if ((buf = ibuf_dynamic(PKG_DEF_SIZE, IBUF_READ_SIZE)) == NULL)
fatal("send_hello");
/* OSPF header */
if (gen_ospf_hdr(buf, iface, PACKET_TYPE_HELLO))
goto fail;
/* hello header */
hello.iface_id = htonl(iface->ifindex);
LSA_24_SETHI(hello.opts, iface->priority);
opts = area_ospf_options(area_find(oeconf, iface->area_id));
LSA_24_SETLO(hello.opts, opts);
hello.opts = htonl(hello.opts);
hello.hello_interval = htons(iface->hello_interval);
hello.rtr_dead_interval = htons(iface->dead_interval);
if (iface->dr) {
hello.d_rtr = iface->dr->id.s_addr;
iface->self->dr.s_addr = iface->dr->id.s_addr;
} else
hello.d_rtr = 0;
if (iface->bdr) {
hello.bd_rtr = iface->bdr->id.s_addr;
iface->self->bdr.s_addr = iface->bdr->id.s_addr;
} else
hello.bd_rtr = 0;
if (ibuf_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 (ibuf_add(buf, &nbr->id, sizeof(nbr->id)))
goto fail;
}
/* calculate checksum */
if (upd_ospf_hdr(buf, iface))
goto fail;
ret = send_packet(iface, buf->buf, buf->wpos, &dst);
ibuf_free(buf);
return (ret);
fail:
log_warn("send_hello");
ibuf_free(buf);
return (-1);
}
void
recv_hello(struct iface *iface, struct in6_addr *src, u_int32_t rtr_id,
char *buf, u_int16_t len)
{
struct hello_hdr hello;
struct nbr *nbr = NULL, *dr;
struct area *area;
u_int32_t nbr_id, opts;
int 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 (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 (ntohs(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 ((area = area_find(oeconf, iface->area_id)) == NULL)
fatalx("interface lost area");
opts = LSA_24_GETLO(ntohl(hello.opts));
if ((opts & OSPF_OPTION_E && area->stub) ||
((opts & OSPF_OPTION_E) == 0 && !area->stub)) {
log_warnx("recv_hello: ExternalRoutingCapability mismatch, "
"interface %s", iface->name);
return;
}
/* match router-id */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr == iface->self)
continue;
if (nbr->id.s_addr == rtr_id)
break;
}
if (!nbr) {
nbr = nbr_new(rtr_id, iface, ntohl(hello.iface_id), 0, src);
/* set neighbor parameters */
nbr->dr.s_addr = hello.d_rtr;
nbr->bdr.s_addr = hello.bd_rtr;
nbr->priority = LSA_24_GETHI(ntohl(hello.opts));
nbr_change = 1;
}
/* actually the neighbor address shouldn't be stored on virtual links */
nbr->addr = *src;
nbr->options = opts;
nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
while (len >= sizeof(nbr_id)) {
memcpy(&nbr_id, buf, sizeof(nbr_id));
if (nbr_id == ospfe_router_id()) {
/* seen myself */
if (nbr->state & NBR_STA_PRELIM)
nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD);
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 = LSA_24_GETHI(ntohl(hello.opts));
return;
}
if (nbr->priority != LSA_24_GETHI(ntohl(hello.opts))) {
nbr->priority = LSA_24_GETHI(ntohl(hello.opts));
nbr_change = 1;
}
if (iface->state & IF_STA_WAITING &&
hello.d_rtr == nbr->id.s_addr && hello.bd_rtr == 0)
if_fsm(iface, IF_EVT_BACKUP_SEEN);
if (iface->state & IF_STA_WAITING && hello.bd_rtr == nbr->id.s_addr) {
/*
* In case we see the BDR make sure that the DR is around
* with a bidirectional (2_WAY or better) connection
*/
LIST_FOREACH(dr, &iface->nbr_list, entry)
if (hello.d_rtr == dr->id.s_addr &&
dr->state & NBR_STA_BIDIR)
if_fsm(iface, IF_EVT_BACKUP_SEEN);
}
if ((nbr->id.s_addr == nbr->dr.s_addr &&
nbr->id.s_addr != hello.d_rtr) ||
(nbr->id.s_addr != nbr->dr.s_addr &&
nbr->id.s_addr == hello.d_rtr))
/* neighbor changed from or to DR */
nbr_change = 1;
if ((nbr->id.s_addr == nbr->bdr.s_addr &&
nbr->id.s_addr != hello.bd_rtr) ||
(nbr->id.s_addr != nbr->bdr.s_addr &&
nbr->id.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 (nbr_change)
if_fsm(iface, IF_EVT_NBR_CHNG);
/* TODO NBMA needs some special handling */
}
|
