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/* $OpenBSD: notification.c,v 1.17 2014/10/25 03:23:49 lteo 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/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 ibuf *, 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)
{
log_debug("send_notification_nbr: nbr ID %s, status %s",
inet_ntoa(nbr->id), notification_name(status));
send_notification(status, nbr->tcp, msgid, type);
nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}
void
send_notification(u_int32_t status, struct tcp_conn *tcp, u_int32_t msgid,
u_int32_t type)
{
struct ibuf *buf;
u_int16_t size;
if ((buf = ibuf_open(LDP_MAX_LEN)) == NULL)
fatal("send_notification");
size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + STATUS_SIZE;
gen_ldp_hdr(buf, 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);
evbuf_enqueue(&tcp->wbuf, 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));
bcopy(buf, ¬, sizeof(not));
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
if (len < STATUS_SIZE) {
session_shutdown(nbr, S_BAD_MSG_LEN, not.msgid, not.type);
return (-1);
}
bcopy(buf, &st, sizeof(st));
if (ntohs(st.length) > STATUS_SIZE - TLV_HDR_LEN ||
ntohs(st.length) > len - TLV_HDR_LEN) {
session_shutdown(nbr, S_BAD_TLV_LEN, not.msgid, not.type);
return (-1);
}
/* TODO optional parameters: ext status, returned PDU and msg */
if (st.status_code & htonl(STATUS_FATAL))
log_warnx("received notification from neighbor %s: %s",
inet_ntoa(nbr->id),
notification_name(ntohl(st.status_code)));
else
log_debug("received non-fatal notification from neighbor "
"%s: %s", inet_ntoa(nbr->id),
notification_name(ntohl(st.status_code)));
if (st.status_code & htonl(STATUS_FATAL)) {
if (st.status_code == htonl(S_NO_HELLO) ||
st.status_code == htonl(S_PARM_ADV_MODE) ||
st.status_code == htonl(S_MAX_PDU_LEN) ||
st.status_code == htonl(S_PARM_L_RANGE) ||
st.status_code == htonl(S_KEEPALIVE_BAD))
nbr_start_idtimer(nbr);
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
return (-1);
}
/* XXX in some cases we should inform the RDE about non-fatal ones */
return (ntohs(not.length));
}
int
gen_status_tlv(struct ibuf *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 (ibuf_add(buf, &st, STATUS_SIZE));
}
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