void
recv_hello(struct iface *iface, struct in_addr src, char *buf, u_int16_t len)
{
struct ldp_msg hello;
struct ldp_hdr ldp;
struct nbr *nbr = NULL;
struct in_addr address;
u_int32_t conf_number;
u_int16_t holdtime, flags;
int r;
bcopy(buf, &ldp, sizeof(ldp));
buf += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
bcopy(buf, &hello, sizeof(hello));
buf += sizeof(struct ldp_msg);
len -= sizeof(struct ldp_msg);
r = tlv_decode_hello_prms(buf, len, &holdtime, &flags);
if (r == -1) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: failed to decode params",
inet_ntoa(address));
return;
}
buf += r;
len -= r;
r = tlv_decode_opt_hello_prms(buf, len, &address, &conf_number);
if (r == -1) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: failed to decode "
"optional params", inet_ntoa(address));
return;
}
if (r != len) {
address.s_addr = ldp.lsr_id;
log_debug("recv_hello: neighbor %s: unexpected data in message",
inet_ntoa(address));
return;
}
nbr = nbr_find_ldpid(ldp.lsr_id, ldp.lspace_id);
if (!nbr) {
struct in_addr a;
if (address.s_addr == INADDR_ANY)
a = src;
else
a = address;
nbr = nbr_new(ldp.lsr_id, ldp.lspace_id, iface, a);
/* set neighbor parameters */
nbr->hello_type = flags;
if (holdtime == 0) {
/* XXX: lacks support for targeted hellos */
if (iface->holdtime < LINK_DFLT_HOLDTIME)
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = LINK_DFLT_HOLDTIME;
} else if (holdtime == INFINITE_HOLDTIME) {
/* No timeout for this neighbor */
nbr->holdtime = iface->holdtime;
} else {
if (iface->holdtime < holdtime)
nbr->holdtime = iface->holdtime;
else
nbr->holdtime = holdtime;
}
}
nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
if (ntohl(nbr->addr.s_addr) < ntohl(nbr->iface->addr.s_addr) &&
nbr->state == NBR_STA_PRESENT && !nbr_pending_idtimer(nbr))
nbr_act_session_establish(nbr, 1);
}
int
recv_notification(struct nbr *nbr, char *buf, uint16_t len)
{
struct ldp_msg msg;
struct status_tlv st;
struct notify_msg nm;
int tlen;
memcpy(&msg, buf, sizeof(msg));
buf += LDP_MSG_SIZE;
len -= LDP_MSG_SIZE;
if (len < STATUS_SIZE) {
session_shutdown(nbr, S_BAD_MSG_LEN, msg.id, msg.type);
return (-1);
}
memcpy(&st, buf, sizeof(st));
if (ntohs(st.length) > STATUS_SIZE - TLV_HDR_SIZE ||
ntohs(st.length) > len - TLV_HDR_SIZE) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
buf += STATUS_SIZE;
len -= STATUS_SIZE;
memset(&nm, 0, sizeof(nm));
nm.status_code = 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, msg.id, msg.type);
return (-1);
}
memcpy(&tlv, buf, TLV_HDR_SIZE);
tlv_len = ntohs(tlv.length);
if (tlv_len + TLV_HDR_SIZE > len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
return (-1);
}
buf += TLV_HDR_SIZE;
len -= TLV_HDR_SIZE;
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,
msg.id, msg.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, &msg, buf,
tlv_len, &nm.fec)) == -1)
return (-1);
/* allow only one fec element */
if (tlen != tlv_len) {
session_shutdown(nbr, S_BAD_TLV_VAL,
msg.id, msg.type);
return (-1);
}
nm.flags |= F_NOTIF_FEC;
break;
default:
if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
send_notification_nbr(nbr, S_UNKNOWN_TLV,
msg.id, msg.type);
/* ignore unknown tlv */
break;
}
buf += tlv_len;
len -= tlv_len;
}
if (nm.status_code == S_PW_STATUS) {
if (!(nm.flags & (F_NOTIF_PW_STATUS|F_NOTIF_FEC))) {
send_notification_nbr(nbr, S_MISS_MSG,
msg.id, msg.type);
return (-1);
}
switch (nm.fec.type) {
case MAP_TYPE_PWID:
break;
default:
send_notification_nbr(nbr, S_BAD_TLV_VAL,
msg.id, msg.type);
return (-1);
}
}
if (st.status_code & htonl(STATUS_FATAL))
log_warnx("received notification from lsr-id %s: %s",
inet_ntoa(nbr->id),
status_code_name(ntohl(st.status_code)));
else
log_debug("received non-fatal notification from lsr-id "
"%s: %s", inet_ntoa(nbr->id),
status_code_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_code == S_PW_STATUS)
ldpe_imsg_compose_lde(IMSG_NOTIFICATION, nbr->peerid, 0,
&nm, sizeof(nm));
return (0);
}
