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/* $OpenBSD: init.c,v 1.7 2011/01/10 12:02:48 claudio 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 <unistd.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"
int gen_init_prms_tlv(struct ibuf *, struct nbr *, u_int16_t);
int tlv_decode_opt_init_prms(char *, u_int16_t);
void
send_init(struct nbr *nbr)
{
struct ibuf *buf;
u_int16_t size;
if (nbr->iface->passive)
return;
log_debug("send_init: neighbor ID %s", inet_ntoa(nbr->id));
if ((buf = ibuf_open(LDP_MAX_LEN)) == NULL)
fatal("send_init");
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + SESS_PRMS_SIZE;
gen_ldp_hdr(buf, nbr->iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_INIT, size);
size -= sizeof(struct ldp_msg);
gen_init_prms_tlv(buf, nbr, size);
evbuf_enqueue(&nbr->wbuf, buf);
}
int
recv_init(struct nbr *nbr, char *buf, u_int16_t len)
{
struct ldp_msg init;
struct sess_prms_tlv sess;
log_debug("recv_init: neighbor ID %s", inet_ntoa(nbr->id));
bcopy(buf, &init, sizeof(init));
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
if (len < SESS_PRMS_SIZE) {
session_shutdown(nbr, S_BAD_MSG_LEN, init.msgid, init.type);
return (-1);
}
bcopy(buf, &sess, sizeof(sess));
if (ntohs(sess.length) != SESS_PRMS_SIZE - TLV_HDR_LEN ||
ntohs(sess.length) > len - TLV_HDR_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, init.msgid, init.type);
return (-1);
}
buf += SESS_PRMS_SIZE;
len -= SESS_PRMS_SIZE;
/* just ignore all optional TLVs for now */
if (tlv_decode_opt_init_prms(buf, len) == -1) {
session_shutdown(nbr, S_BAD_TLV_VAL, init.msgid, init.type);
return (-1);
}
if (nbr->iface->keepalive < ntohs(sess.keepalive_time))
nbr->keepalive = nbr->iface->keepalive;
else
nbr->keepalive = ntohs(sess.keepalive_time);
nbr_fsm(nbr, NBR_EVT_INIT_RCVD);
return (ntohs(init.length));
}
int
gen_init_prms_tlv(struct ibuf *buf, struct nbr *nbr, u_int16_t size)
{
struct sess_prms_tlv parms;
/* We want just the size of the value */
size -= TLV_HDR_LEN;
bzero(&parms, sizeof(parms));
parms.type = htons(TLV_TYPE_COMMONSESSION);
parms.length = htons(size);
parms.proto_version = htons(LDP_VERSION);
parms.keepalive_time = htons(nbr->iface->keepalive);
parms.reserved = 0;
parms.pvlim = 0;
parms.max_pdu_len = 0;
parms.lsr_id = nbr->id.s_addr;
/* XXX: nbr lspace */
parms.lspace_id = 0;
return (ibuf_add(buf, &parms, SESS_PRMS_SIZE));
}
int
tlv_decode_opt_init_prms(char *buf, u_int16_t len)
{
struct tlv tlv;
int cons = 0;
u_int16_t tlv_len;
while (len >= sizeof(tlv)) {
bcopy(buf, &tlv, sizeof(tlv));
tlv_len = ntohs(tlv.length);
switch (ntohs(tlv.type)) {
case TLV_TYPE_ATMSESSIONPAR:
log_warnx("ATM session parameter present");
return (-1);
case TLV_TYPE_FRSESSION:
log_warnx("FR session parameter present");
return (-1);
default:
/* if unknown flag set, ignore TLV */
if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
return (-1);
break;
}
buf += TLV_HDR_LEN + tlv_len;
len -= TLV_HDR_LEN + tlv_len;
cons += TLV_HDR_LEN + tlv_len;
}
return (cons);
}
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