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/* $OpenBSD: notification.c,v 1.6 2010/05/14 13:49:09 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_status_tlv(struct buf *, u_int32_t, u_int32_t, u_int32_t);
void
send_notification_nbr(struct nbr *nbr, u_int32_t status, u_int32_t msgid,
u_int32_t type)
{
struct buf *buf;
if (nbr->iface->passive)
return;
buf = send_notification(status, nbr->iface, msgid, type);
evbuf_enqueue(&nbr->wbuf, buf);
}
struct buf *
send_notification(u_int32_t status, struct iface *iface, u_int32_t msgid,
u_int32_t type)
{
struct buf *buf;
u_int16_t size;
if ((buf = buf_open(LDP_MAX_LEN)) == NULL)
fatal("send_notification");
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + STATUS_SIZE;
gen_ldp_hdr(buf, iface, size);
size -= LDP_HDR_SIZE;
gen_msg_tlv(buf, MSG_TYPE_NOTIFICATION, size);
size -= sizeof(struct ldp_msg);
gen_status_tlv(buf, status, msgid, type);
return (buf);
}
int
recv_notification(struct nbr *nbr, char *buf, u_int16_t len)
{
struct ldp_msg *not;
struct status_tlv *st;
log_debug("recv_notification: neighbor ID %s", inet_ntoa(nbr->id));
not = (struct ldp_msg *)buf;
if ((len - TLV_HDR_LEN) < ntohs(not->length)) {
session_shutdown(nbr, S_BAD_MSG_LEN, not->msgid, not->type);
return (-1);
}
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
st = (struct status_tlv *)buf;
if (len < STATUS_SIZE ||
(STATUS_SIZE - TLV_HDR_LEN) != ntohs(st->length)) {
session_shutdown(nbr, S_BAD_TLV_LEN, not->msgid, not->type);
return (-1);
}
if (st->status_code & htonl(STATUS_FATAL))
log_warnx("recieved notification from neighbor %s: %s",
inet_ntoa(nbr->id),
notification_name(ntohl(st->status_code)));
else
log_debug("recieved non-fatal notification from neighbor "
"%s: %s", inet_ntoa(nbr->id),
notification_name(ntohl(st->status_code)));
if (st->status_code & htonl(STATUS_FATAL)) {
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
return (-1);
}
return (ntohs(not->length));
}
int
gen_status_tlv(struct buf *buf, u_int32_t status, u_int32_t msgid,
u_int32_t type)
{
struct status_tlv st;
bzero(&st, sizeof(st));
st.type = htons(TLV_TYPE_STATUS);
st.length = htons(STATUS_TLV_LEN);
st.status_code = htonl(status);
st.msg_id = msgid;
st.msg_type = type;
return (buf_add(buf, &st, STATUS_SIZE));
}
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