Function sctp_inpcb_free

freebsd/netinet/sctp_pcb.c:3294–3674

release sctp_inpcb unbind the port */

/* release sctp_inpcb unbind the port */
void
sctp_inpcb_free(struct sctp_inpcb *inp, int immediate, int from)
{
	/*
	 * Here we free a endpoint. We must find it (if it is in the Hash
	 * table) and remove it from there. Then we must also find it in the
	 * overall list and remove it from there. After all removals are
	 * complete then any timer has to be stopped. Then start the actual
	 * freeing. a) Any local lists. b) Any associations. c) The hash of
	 * all associations. d) finally the ep itself.
	 */
	struct sctp_tcb *asoc, *nasoc;
	struct sctp_laddr *laddr, *nladdr;
	struct inpcb *ip_pcb;
	struct socket *so;
	int being_refed = 0;
	struct sctp_queued_to_read *sq, *nsq;
	int cnt;
	sctp_sharedkey_t *shared_key, *nshared_key;

#ifdef SCTP_LOG_CLOSING
	sctp_log_closing(inp, NULL, 0);
#endif
	SCTP_ITERATOR_LOCK();
	/* mark any iterators on the list or being processed */
	sctp_iterator_inp_being_freed(inp);
	SCTP_ITERATOR_UNLOCK();
	so = inp->sctp_socket;
	if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
		/* been here before.. eeks.. get out of here */
		SCTP_PRINTF("This conflict in free SHOULD not be happening! from %d, imm %d\n", from, immediate);
#ifdef SCTP_LOG_CLOSING
		sctp_log_closing(inp, NULL, 1);
#endif
		return;
	}
	SCTP_ASOC_CREATE_LOCK(inp);
	SCTP_INP_INFO_WLOCK();

	SCTP_INP_WLOCK(inp);
	if (from == SCTP_CALLED_AFTER_CMPSET_OFCLOSE) {
		inp->sctp_flags &= ~SCTP_PCB_FLAGS_CLOSE_IP;
		/* socket is gone, so no more wakeups allowed */
		inp->sctp_flags |= SCTP_PCB_FLAGS_DONT_WAKE;
		inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEINPUT;
		inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEOUTPUT;
	}
	/* First time through we have the socket lock, after that no more. */
	sctp_timer_stop(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL,
	    SCTP_FROM_SCTP_PCB + SCTP_LOC_1);

	if (inp->control) {
		sctp_m_freem(inp->control);
		inp->control = NULL;
	}
	if (inp->pkt) {
		sctp_m_freem(inp->pkt);
		inp->pkt = NULL;