init.c revision 1.3 
1/*	$OpenBSD: init.c,v 1.3 2010/02/20 21:28:39 michele Exp $ */
2
3/*
4 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/socket.h>
21#include <sys/uio.h>
22
23#include <netinet/in.h>
24#include <netinet/in_systm.h>
25#include <netinet/ip.h>
26#include <arpa/inet.h>
27#include <net/if_dl.h>
28#include <unistd.h>
29
30#include <errno.h>
31#include <event.h>
32#include <stdlib.h>
33#include <string.h>
34
35#include "ldpd.h"
36#include "ldp.h"
37#include "log.h"
38#include "ldpe.h"
39
40int	gen_init_prms_tlv(struct buf *, struct nbr *, u_int16_t);
41
42void
43send_init(struct nbr *nbr)
44{
45	struct buf		*buf;
46	u_int16_t		 size;
47
48	if (nbr->iface->passive)
49		return;
50
51	log_debug("send_init: neighbor ID %s", inet_ntoa(nbr->id));
52
53	if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
54		fatal("send_init");
55
56	size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + SESS_PRMS_SIZE;
57
58	gen_ldp_hdr(buf, nbr->iface, size);
59
60	size -= LDP_HDR_SIZE;
61
62	gen_msg_tlv(buf, MSG_TYPE_INIT, size);
63
64	size -= sizeof(struct ldp_msg);
65
66	gen_init_prms_tlv(buf, nbr, size);
67
68	bufferevent_write(nbr->bev, buf->buf, buf->wpos);
69	buf_free(buf);
70}
71
72int
73recv_init(struct nbr *nbr, char *buf, u_int16_t len)
74{
75	struct ldp_msg		*init;
76	struct sess_prms_tlv	*sess_tlv;
77
78	log_debug("recv_init: neighbor ID %s", inet_ntoa(nbr->id));
79
80	init = (struct ldp_msg *)buf;
81
82	if ((len - TLV_HDR_LEN) < ntohs(init->length)) {
83		session_shutdown(nbr, S_BAD_MSG_LEN, init->msgid, init->type);
84		return (-1);
85	}
86
87	buf += sizeof(struct ldp_msg);
88	len -= sizeof(struct ldp_msg);
89
90	sess_tlv = (struct sess_prms_tlv *)buf;
91
92	if (len < SESS_PRMS_SIZE ||
93	    ntohs(sess_tlv->length) != (SESS_PRMS_SIZE - TLV_HDR_LEN)) {
94		session_shutdown(nbr, S_BAD_TLV_LEN, init->msgid, init->type);
95		return (-1);
96	}
97
98	if (nbr->iface->keepalive < ntohs(sess_tlv->keepalive_time))
99		nbr->keepalive = nbr->iface->keepalive;
100	else
101		nbr->keepalive = ntohs(sess_tlv->keepalive_time);
102
103	nbr_fsm(nbr, NBR_EVT_INIT_RCVD);
104
105	return (ntohs(init->length));
106}
107
108int
109gen_init_prms_tlv(struct buf *buf, struct nbr *nbr, u_int16_t size)
110{
111	struct sess_prms_tlv	parms;
112
113	/* We want just the size of the value */
114	size -= TLV_HDR_LEN;
115
116	bzero(&parms, sizeof(parms));
117	parms.type = htons(TLV_TYPE_COMMONSESSION);
118	parms.length = htons(size);
119	parms.proto_version = htons(LDP_VERSION);
120	parms.keepalive_time = htons(nbr->iface->keepalive);
121	parms.reserved = 0;
122	parms.pvlim = 0;
123	parms.max_pdu_len = 0;
124	parms.lsr_id = nbr->id.s_addr;
125	/* XXX: nbr lspace */
126	parms.lspace_id = 0;
127
128	return (buf_add(buf, &parms, SESS_PRMS_SIZE));
129}
130