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
|
/* $OpenBSD: lsreq.c,v 1.23 2021/11/03 21:40:03 sthen Exp $ */
/*
* 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 <stdlib.h>
#include "ospfd.h"
#include "ospf.h"
#include "log.h"
#include "ospfe.h"
/* link state request packet handling */
int
send_ls_req(struct nbr *nbr)
{
struct sockaddr_in dst;
struct ls_req_hdr ls_req_hdr;
struct lsa_entry *le, *nle;
struct ibuf *buf;
if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL)
fatal("send_ls_req");
/* set destination */
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
switch (nbr->iface->type) {
case IF_TYPE_POINTOPOINT:
inet_aton(AllSPFRouters, &dst.sin_addr);
break;
case IF_TYPE_BROADCAST:
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
dst.sin_addr.s_addr = nbr->addr.s_addr;
break;
default:
fatalx("send_ls_req: unknown interface type");
}
/* OSPF header */
if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_LS_REQUEST))
goto fail;
/* LSA header(s), keep space for a possible md5 sum */
for (le = TAILQ_FIRST(&nbr->ls_req_list); le != NULL &&
ibuf_left(buf) >= sizeof(struct ls_req_hdr) + MD5_DIGEST_LENGTH;
le = nle) {
nbr->ls_req = nle = TAILQ_NEXT(le, entry);
ls_req_hdr.type = htonl(le->le_lsa->type);
ls_req_hdr.ls_id = le->le_lsa->ls_id;
ls_req_hdr.adv_rtr = le->le_lsa->adv_rtr;
if (ibuf_add(buf, &ls_req_hdr, sizeof(ls_req_hdr)))
goto fail;
}
/* update authentication and calculate checksum */
if (auth_gen(buf, nbr->iface))
goto fail;
if (send_packet(nbr->iface, buf, &dst) == -1)
goto fail;
ibuf_free(buf);
return (0);
fail:
log_warn("%s", __func__);
ibuf_free(buf);
return (-1);
}
void
recv_ls_req(struct nbr *nbr, char *buf, u_int16_t len)
{
switch (nbr->state) {
case NBR_STA_DOWN:
case NBR_STA_ATTEMPT:
case NBR_STA_INIT:
case NBR_STA_2_WAY:
case NBR_STA_XSTRT:
case NBR_STA_SNAP:
log_debug("recv_ls_req: packet ignored in state %s, "
"neighbor ID %s (%s)", nbr_state_name(nbr->state),
inet_ntoa(nbr->id), nbr->iface->name);
break;
case NBR_STA_XCHNG:
case NBR_STA_LOAD:
case NBR_STA_FULL:
ospfe_imsg_compose_rde(IMSG_LS_REQ, nbr->peerid, 0, buf, len);
break;
default:
fatalx("recv_ls_req: unknown neighbor state");
}
}
/* link state request list */
void
ls_req_list_add(struct nbr *nbr, struct lsa_hdr *lsa)
{
struct lsa_entry *le;
if (lsa == NULL)
fatalx("ls_req_list_add: no LSA header");
if ((le = calloc(1, sizeof(*le))) == NULL)
fatal("ls_req_list_add");
TAILQ_INSERT_TAIL(&nbr->ls_req_list, le, entry);
le->le_lsa = lsa;
nbr->ls_req_cnt++;
}
struct lsa_entry *
ls_req_list_get(struct nbr *nbr, struct lsa_hdr *lsa_hdr)
{
struct lsa_entry *le;
TAILQ_FOREACH(le, &nbr->ls_req_list, entry) {
if ((lsa_hdr->type == le->le_lsa->type) &&
(lsa_hdr->ls_id == le->le_lsa->ls_id) &&
(lsa_hdr->adv_rtr == le->le_lsa->adv_rtr))
return (le);
}
return (NULL);
}
void
ls_req_list_free(struct nbr *nbr, struct lsa_entry *le)
{
if (nbr->ls_req == le) {
nbr->ls_req = TAILQ_NEXT(le, entry);
}
TAILQ_REMOVE(&nbr->ls_req_list, le, entry);
free(le->le_lsa);
free(le);
nbr->ls_req_cnt--;
/* received all requested LSA(s), send a new LS req */
if (nbr->ls_req != NULL &&
nbr->ls_req == TAILQ_FIRST(&nbr->ls_req_list)) {
start_ls_req_tx_timer(nbr);
}
/* we might not have received all DDs and are still in XCHNG */
if (ls_req_list_empty(nbr) && nbr->dd_pending == 0 &&
nbr->state != NBR_STA_XCHNG)
nbr_fsm(nbr, NBR_EVT_LOAD_DONE);
}
void
ls_req_list_clr(struct nbr *nbr)
{
struct lsa_entry *le;
while ((le = TAILQ_FIRST(&nbr->ls_req_list)) != NULL) {
TAILQ_REMOVE(&nbr->ls_req_list, le, entry);
free(le->le_lsa);
free(le);
}
nbr->ls_req_cnt = 0;
nbr->ls_req = NULL;
}
int
ls_req_list_empty(struct nbr *nbr)
{
return (TAILQ_EMPTY(&nbr->ls_req_list));
}
/* timers */
/* ARGSUSED */
void
ls_req_tx_timer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
struct timeval tv;
switch (nbr->state) {
case NBR_STA_DOWN:
case NBR_STA_ATTEMPT:
case NBR_STA_INIT:
case NBR_STA_2_WAY:
case NBR_STA_SNAP:
case NBR_STA_XSTRT:
case NBR_STA_XCHNG:
return;
case NBR_STA_LOAD:
send_ls_req(nbr);
break;
case NBR_STA_FULL:
return;
default:
log_debug("ls_req_tx_timer: unknown neighbor state, "
"neighbor ID %s (%s)", inet_ntoa(nbr->id),
nbr->iface->name);
break;
}
/* reschedule lsreq_tx_timer */
if (nbr->state == NBR_STA_LOAD) {
timerclear(&tv);
tv.tv_sec = nbr->iface->rxmt_interval;
if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1)
fatal("ls_req_tx_timer");
}
}
void
start_ls_req_tx_timer(struct nbr *nbr)
{
struct timeval tv;
if (nbr == nbr->iface->self)
return;
timerclear(&tv);
if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1)
fatal("start_ls_req_tx_timer");
}
void
stop_ls_req_tx_timer(struct nbr *nbr)
{
if (nbr == nbr->iface->self)
return;
if (evtimer_del(&nbr->lsreq_tx_timer) == -1)
fatal("stop_ls_req_tx_timer");
}
|
