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/* $OpenBSD: notification.c,v 1.36 2016/06/27 19:06:33 renato 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 <arpa/inet.h>
#include <string.h>
#include "ldpd.h"
#include "ldp.h"
#include "log.h"
#include "ldpe.h"
static int gen_status_tlv(struct ibuf *, uint32_t, uint32_t, uint32_t);
void
send_notification_full(struct tcp_conn *tcp, struct notify_msg *nm)
{
struct ibuf *buf;
uint16_t size;
int err = 0;
/* calculate size */
size = LDP_HDR_SIZE + LDP_MSG_SIZE + STATUS_SIZE;
if (nm->flags & F_NOTIF_PW_STATUS)
size += PW_STATUS_TLV_LEN;
if (nm->flags & F_NOTIF_FEC) {
size += TLV_HDR_LEN;
switch (nm->fec.type) {
case MAP_TYPE_PWID:
size += FEC_PWID_ELM_MIN_LEN;
if (nm->fec.flags & F_MAP_PW_ID)
size += sizeof(uint32_t);
break;
}
}
if ((buf = ibuf_open(size)) == NULL)
fatal(__func__);
err |= gen_ldp_hdr(buf, size);
size -= LDP_HDR_SIZE;
err |= gen_msg_hdr(buf, MSG_TYPE_NOTIFICATION, size);
err |= gen_status_tlv(buf, nm->status, nm->messageid, nm->type);
/* optional tlvs */
if (nm->flags & F_NOTIF_PW_STATUS)
err |= gen_pw_status_tlv(buf, nm->pw_status);
if (nm->flags & F_NOTIF_FEC)
err |= gen_fec_tlv(buf, &nm->fec);
if (err) {
ibuf_free(buf);
return;
}
evbuf_enqueue(&tcp->wbuf, buf);
}
/* send a notification without optional tlvs */
void
send_notification(uint32_t status, struct tcp_conn *tcp, uint32_t msgid,
uint16_t type)
{
struct notify_msg nm;
memset(&nm, 0, sizeof(nm));
nm.status = status;
nm.messageid = msgid;
nm.type = type;
send_notification_full(tcp, &nm);
}
void
send_notification_nbr(struct nbr *nbr, uint32_t status, uint32_t msgid,
uint16_t type)
{
log_debug("%s: lsr-id %s, status %s", __func__, inet_ntoa(nbr->id),
notification_name(status));
send_notification(status, nbr->tcp, msgid, type);
nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}
int
recv_notification(struct nbr *nbr, char *buf, uint16_t len)
{
struct ldp_msg not;
struct status_tlv st;
struct notify_msg nm;
int tlen;
memcpy(¬, buf, sizeof(not));
buf += LDP_MSG_SIZE;
len -= LDP_MSG_SIZE;
if (len < STATUS_SIZE) {
session_shutdown(nbr, S_BAD_MSG_LEN, not.msgid, not.type);
return (-1);
}
memcpy(&st, buf, 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);
}
buf += STATUS_SIZE;
len -= STATUS_SIZE;
memset(&nm, 0, sizeof(nm));
nm.status = ntohl(st.status_code);
/* Optional Parameters */
while (len > 0) {
struct tlv tlv;
uint16_t tlv_len;
if (len < sizeof(tlv)) {
session_shutdown(nbr, S_BAD_TLV_LEN, not.msgid,
not.type);
return (-1);
}
memcpy(&tlv, buf, TLV_HDR_LEN);
buf += TLV_HDR_LEN;
len -= TLV_HDR_LEN;
tlv_len = ntohs(tlv.length);
switch (ntohs(tlv.type)) {
case TLV_TYPE_EXTSTATUS:
case TLV_TYPE_RETURNEDPDU:
case TLV_TYPE_RETURNEDMSG:
/* TODO is there any use for this? */
break;
case TLV_TYPE_PW_STATUS:
if (tlv_len != 4) {
session_shutdown(nbr, S_BAD_TLV_LEN,
not.msgid, not.type);
return (-1);
}
nm.pw_status = ntohl(*(uint32_t *)buf);
nm.flags |= F_NOTIF_PW_STATUS;
break;
case TLV_TYPE_FEC:
if ((tlen = tlv_decode_fec_elm(nbr, ¬, buf,
tlv_len, &nm.fec)) == -1)
return (-1);
/* allow only one fec element */
if (tlen != tlv_len) {
session_shutdown(nbr, S_BAD_TLV_VAL,
not.msgid, not.type);
return (-1);
}
nm.flags |= F_NOTIF_FEC;
break;
default:
if (!(ntohs(tlv.type) & UNKNOWN_FLAG)) {
send_notification_nbr(nbr, S_UNKNOWN_TLV,
not.msgid, not.type);
}
/* ignore unknown tlv */
break;
}
buf += tlv_len;
len -= tlv_len;
}
if (nm.status == S_PW_STATUS) {
if (!(nm.flags & (F_NOTIF_PW_STATUS|F_NOTIF_FEC))) {
send_notification_nbr(nbr, S_MISS_MSG,
not.msgid, not.type);
return (-1);
}
switch (nm.fec.type) {
case MAP_TYPE_PWID:
break;
default:
send_notification_nbr(nbr, S_BAD_TLV_VAL,
not.msgid, not.type);
return (-1);
}
}
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 (nbr->state == NBR_STA_OPENSENT)
nbr_start_idtimer(nbr);
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
return (-1);
}
if (nm.status == S_PW_STATUS)
ldpe_imsg_compose_lde(IMSG_NOTIFICATION, nbr->peerid, 0,
&nm, sizeof(nm));
return (0);
}
static int
gen_status_tlv(struct ibuf *buf, uint32_t status, uint32_t msgid, uint32_t type)
{
struct status_tlv st;
memset(&st, 0, sizeof(st));
st.type = htons(TLV_TYPE_STATUS);
st.length = htons(STATUS_TLV_LEN);
st.status_code = htonl(status);
/* for convenience, msgid and type are already in network byte order */
st.msg_id = msgid;
st.msg_type = type;
return (ibuf_add(buf, &st, STATUS_SIZE));
}
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