Function tcp_usr_rcvoob

freebsd/netinet/tcp_usrreq.c:1484–1526

* Receive out-of-band data. */

 * Receive out-of-band data.
 */
static int
tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
{
	int error = 0;
	struct inpcb *inp;
	struct tcpcb *tp = NULL;

	TCPDEBUG0;
	inp = sotoinpcb(so);
	KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
	INP_WLOCK(inp);
	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
		error = ECONNRESET;
		goto out;
	}
	tp = intotcpcb(inp);
	error = tcp_pru_options_support(tp, PRUS_OOB);
	if (error) {
		goto out;
	}
	TCPDEBUG1();
	if ((so->so_oobmark == 0 &&
	     (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
	    so->so_options & SO_OOBINLINE ||
	    tp->t_oobflags & TCPOOB_HADDATA) {
		error = EINVAL;
		goto out;
	}
	if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
		error = EWOULDBLOCK;
		goto out;
	}
	m->m_len = 1;
	*mtod(m, caddr_t) = tp->t_iobc;
	if ((flags & MSG_PEEK) == 0)
		tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);

out:
	TCPDEBUG2(PRU_RCVOOB);
	TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
	INP_WUNLOCK(inp);
	return (error);
}

#ifdef INET
struct pr_usrreqs tcp_usrreqs = {