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
|
/* $OpenBSD: hello.c,v 1.4 2010/02/16 21:35:50 michele Exp $ */
/*
* Copyright (c) 2009 Michele Marchetto <michele@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 <sys/uio.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <errno.h>
#include <event.h>
#include <stdlib.h>
#include <string.h>
#include "ldpd.h"
#include "ldp.h"
#include "log.h"
#include "ldpe.h"
struct hello_prms_tlv *tlv_decode_hello_prms(char *, u_int16_t);
int tlv_decode_opt_hello_prms(char *, u_int16_t,
struct in_addr *, u_int32_t *);
int gen_hello_prms_tlv(struct iface *, struct buf *,
u_int16_t);
int
send_hello(struct iface *iface)
{
struct sockaddr_in dst;
struct buf *buf;
u_int16_t size;
dst.sin_port = htons(LDP_PORT);
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
inet_aton(AllRouters, &dst.sin_addr);
if (iface->passive)
return (0);
if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
fatal("send_hello");
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) +
sizeof(struct hello_prms_tlv);
gen_ldp_hdr(buf, iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_HELLO, size);
size -= sizeof(struct ldp_msg);
gen_hello_prms_tlv(iface, buf, size);
send_packet(iface, buf->buf, buf->wpos, &dst);
buf_free(buf);
return (0);
}
void
recv_hello(struct iface *iface, struct in_addr src, char *buf, u_int16_t len)
{
struct ldp_msg *hello;
u_int32_t messageid;
struct nbr *nbr = NULL;
struct hello_prms_tlv *cpt;
struct ldp_hdr *ldp;
struct in_addr address;
u_int32_t conf_number;
ldp = (struct ldp_hdr *)buf;
buf += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
hello = (struct ldp_msg *)buf;
if ((len - TLV_HDR_LEN) < ntohs(hello->length))
return;
messageid = hello->msgid;
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
cpt = tlv_decode_hello_prms(buf, len);
if (cpt == NULL)
return;
buf += sizeof(struct hello_prms_tlv);
len -= sizeof(struct hello_prms_tlv);
tlv_decode_opt_hello_prms(buf, len, &address, &conf_number);
nbr = nbr_find_ldpid(iface, ldp->lsr_id, ldp->lspace_id);
if (!nbr) {
nbr = nbr_new(ldp->lsr_id, ldp->lspace_id, iface, 0);
/* set neighbor parameters */
if (address.s_addr == INADDR_ANY)
nbr->addr.s_addr = src.s_addr;
else
nbr->addr.s_addr = address.s_addr;
nbr->hello_type = cpt->reserved;
if (cpt->holdtime == 0) {
/* XXX: lacks support for targeted hellos */
if (iface->holdtime < LINK_DFLT_HOLDTIME)
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = LINK_DFLT_HOLDTIME;
} else if (cpt->holdtime == INFINITE_HOLDTIME) {
/* No timeout for this neighbor */
nbr->holdtime = iface->holdtime;
} else {
if (iface->holdtime < ntohs(cpt->holdtime))
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = ntohs(cpt->holdtime);
}
}
nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
if (ntohl(nbr->addr.s_addr) < ntohl(nbr->iface->addr.s_addr) &&
nbr->state == NBR_STA_PRESENT && !nbr_pending_idtimer(nbr))
nbr_act_session_establish(nbr, 1);
}
int
gen_hello_prms_tlv(struct iface *iface, struct buf *buf, u_int16_t size)
{
struct hello_prms_tlv parms;
/* We want just the size of the value */
size -= TLV_HDR_LEN;
bzero(&parms, sizeof(parms));
parms.type = htons(TLV_TYPE_COMMONHELLO);
parms.length = htons(size);
/* XXX */
parms.holdtime = htons(iface->holdtime);
parms.reserved = 0;
return (buf_add(buf, &parms, sizeof(parms)));
}
struct hello_prms_tlv *
tlv_decode_hello_prms(char *buf, u_int16_t len)
{
struct hello_prms_tlv *tlv;
tlv = (struct hello_prms_tlv *)buf;
if (len < sizeof(*tlv) || ntohs(tlv->length) !=
(sizeof(tlv->holdtime) + sizeof(tlv->reserved)))
return (NULL);
if ((tlv->type & ~UNKNOWN_FLAGS_MASK) != htons(TLV_TYPE_COMMONHELLO))
return (NULL);
if ((tlv->type & UNKNOWN_FLAGS_MASK) != 0)
return (NULL);
return (tlv);
}
int
tlv_decode_opt_hello_prms(char *buf, u_int16_t len, struct in_addr *addr,
u_int32_t *conf_number)
{
struct hello_opt_parms_tlv *tlv;
bzero(addr, sizeof(*addr));
*conf_number = 0;
while (len >= sizeof(*tlv)) {
tlv = (struct hello_opt_parms_tlv *)buf;
if (tlv->length < sizeof(u_int32_t))
return (-1);
switch (ntohs(tlv->type)) {
case TLV_TYPE_IPV4TRANSADDR:
addr->s_addr = tlv->value;
break;
case TLV_TYPE_CONFIG:
*conf_number = ntohl(tlv->value);
break;
default:
return (-1);
}
len -= sizeof(*tlv);
buf += sizeof(*tlv);
}
return (0);
}
|
