Function bbr_set_sockopt

freebsd/netinet/tcp_stacks/bbr.c:14287–14680

* bbr_ctloutput() must drop the inpcb lock before performing copyin on * socket option arguments. When it re-acquires the lock after the copy, it * has to revalidate that the connection is still valid for the socket * option. */

 * option.
 */
static int
bbr_set_sockopt(struct socket *so, struct sockopt *sopt,
		struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr)
{
	struct epoch_tracker et;
	int32_t error = 0, optval;

	switch (sopt->sopt_name) {
	case TCP_RACK_PACE_MAX_SEG:
	case TCP_RACK_MIN_TO:
	case TCP_RACK_REORD_THRESH:
	case TCP_RACK_REORD_FADE:
	case TCP_RACK_TLP_THRESH:
	case TCP_RACK_PKT_DELAY:
	case TCP_BBR_ALGORITHM:
	case TCP_BBR_TSLIMITS:
	case TCP_BBR_IWINTSO:
	case TCP_BBR_RECFORCE:
	case TCP_BBR_STARTUP_PG:
	case TCP_BBR_DRAIN_PG:
	case TCP_BBR_RWND_IS_APP:
	case TCP_BBR_PROBE_RTT_INT:
	case TCP_BBR_PROBE_RTT_GAIN:
	case TCP_BBR_PROBE_RTT_LEN:
	case TCP_BBR_STARTUP_LOSS_EXIT:
	case TCP_BBR_USEDEL_RATE:
	case TCP_BBR_MIN_RTO:
	case TCP_BBR_MAX_RTO:
	case TCP_BBR_PACE_PER_SEC:
	case TCP_DELACK:
	case TCP_BBR_PACE_DEL_TAR:
	case TCP_BBR_SEND_IWND_IN_TSO:
	case TCP_BBR_EXTRA_STATE:
	case TCP_BBR_UTTER_MAX_TSO:
	case TCP_BBR_MIN_TOPACEOUT:
	case TCP_BBR_FLOOR_MIN_TSO:
	case TCP_BBR_TSTMP_RAISES:
	case TCP_BBR_POLICER_DETECT:
	case TCP_BBR_USE_RACK_CHEAT:
	case TCP_DATA_AFTER_CLOSE:
	case TCP_BBR_HDWR_PACE:
	case TCP_BBR_PACE_SEG_MAX:
	case TCP_BBR_PACE_SEG_MIN:
	case TCP_BBR_PACE_CROSS:
	case TCP_BBR_PACE_OH:
#ifdef NETFLIX_PEAKRATE
	case TCP_MAXPEAKRATE:
#endif
	case TCP_BBR_TMR_PACE_OH:
	case TCP_BBR_RACK_RTT_USE:
	case TCP_BBR_RETRAN_WTSO:
		break;
	default:
		return (tcp_default_ctloutput(so, sopt, inp, tp));
		break;
	}
	INP_WUNLOCK(inp);
	error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));