/* 11.2.A1: create a new peer and transition state to listen or connecting */
static enum pim_msdp_err pim_msdp_peer_new(struct pim_instance *pim,
struct in_addr peer_addr,
struct in_addr local_addr,
const char *mesh_group_name,
struct pim_msdp_peer **mp_p)
{
struct pim_msdp_peer *mp;
pim_msdp_enable(pim);
mp = XCALLOC(MTYPE_PIM_MSDP_PEER, sizeof(*mp));
mp->pim = pim;
mp->peer = peer_addr;
pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str));
pim_msdp_addr2su(&mp->su_peer, mp->peer);
mp->local = local_addr;
/* XXX: originator_id setting needs to move to the mesh group */
pim->msdp.originator_id = local_addr;
pim_msdp_addr2su(&mp->su_local, mp->local);
mp->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name);
mp->state = PIM_MSDP_INACTIVE;
mp->fd = -1;
strlcpy(mp->last_reset, "-", sizeof(mp->last_reset));
/* higher IP address is listener */
if (ntohl(mp->local.s_addr) > ntohl(mp->peer.s_addr)) {
mp->flags |= PIM_MSDP_PEERF_LISTENER;
}
/* setup packet buffers */
mp->ibuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE);
mp->obuf = stream_fifo_new();
/* insert into misc tables for easy access */
mp = hash_get(pim->msdp.peer_hash, mp, hash_alloc_intern);
listnode_add_sort(pim->msdp.peer_list, mp);
if (PIM_DEBUG_MSDP_EVENTS) {
zlog_debug("MSDP peer %s created", mp->key_str);
pim_msdp_peer_state_chg_log(mp);
}
/* fireup the connect state machine */
if (PIM_MSDP_PEER_IS_LISTENER(mp)) {
pim_msdp_peer_listen(mp);
} else {
pim_msdp_peer_connect(mp);
}
if (mp_p) {
*mp_p = mp;
}
return PIM_MSDP_ERR_NONE;
}
/* RFC-3618:Sec-5.6 - stop the peer tcp connection and startover */
void pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str)
{
if (PIM_DEBUG_EVENTS) {
zlog_debug("MSDP peer %s tcp reset %s", mp->key_str, rc_str);
snprintf(mp->last_reset, sizeof(mp->last_reset), "%s", rc_str);
}
/* close the connection and transition to listening or connecting */
pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
if (PIM_MSDP_PEER_IS_LISTENER(mp)) {
pim_msdp_peer_listen(mp);
} else {
pim_msdp_peer_connect(mp);
}
}
/* RFC-3618:Sec-5.6 - connection retry on active peer */
static int pim_msdp_peer_cr_timer_cb(struct thread *t)
{
struct pim_msdp_peer *mp;
mp = THREAD_ARG(t);
if (PIM_DEBUG_MSDP_EVENTS) {
pim_msdp_peer_timer_expiry_log(mp, "connect-retry");
}
if (mp->state != PIM_MSDP_CONNECTING || PIM_MSDP_PEER_IS_LISTENER(mp)) {
return 0;
}
pim_msdp_peer_active_connect(mp);
return 0;
}
/* passive peer socket accept */
static int pim_msdp_sock_accept(struct thread *thread)
{
union sockunion su;
struct pim_instance *pim = THREAD_ARG(thread);
int accept_sock;
int msdp_sock;
struct pim_msdp_peer *mp;
char buf[SU_ADDRSTRLEN];
sockunion_init(&su);
/* re-register accept thread */
accept_sock = THREAD_FD(thread);
if (accept_sock < 0) {
flog_err(LIB_ERR_DEVELOPMENT,
"accept_sock is negative value %d", accept_sock);
return -1;
}
pim->msdp.listener.thread = NULL;
thread_add_read(master, pim_msdp_sock_accept, pim, accept_sock,
&pim->msdp.listener.thread);
/* accept client connection. */
msdp_sock = sockunion_accept(accept_sock, &su);
if (msdp_sock < 0) {
flog_err_sys(LIB_ERR_SOCKET, "pim_msdp_sock_accept failed (%s)",
safe_strerror(errno));
return -1;
}
/* see if have peer config for this */
mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) {
++pim->msdp.rejected_accepts;
if (PIM_DEBUG_MSDP_EVENTS) {
flog_err(PIM_ERR_MSDP_PACKET,
"msdp peer connection refused from %s",
sockunion2str(&su, buf, SU_ADDRSTRLEN));
}
close(msdp_sock);
return -1;
}
if (PIM_DEBUG_MSDP_INTERNAL) {
zlog_debug("MSDP peer %s accept success%s", mp->key_str,
mp->fd >= 0 ? "(dup)" : "");
}
/* if we have an existing connection we need to kill that one
* with this one */
if (mp->fd >= 0) {
if (PIM_DEBUG_MSDP_EVENTS) {
zlog_notice(
"msdp peer new connection from %s stop old connection",
sockunion2str(&su, buf, SU_ADDRSTRLEN));
}
pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
}
mp->fd = msdp_sock;
set_nonblocking(mp->fd);
pim_msdp_update_sock_send_buffer_size(mp->fd);
pim_msdp_peer_established(mp);
return 0;
}
