Differential D15337 Diff 42224 sys/netinet/tcp_syncache.c

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sys/netinet/tcp_syncache.c

Show First 20 Lines • Show All 828 Lines • ▼ Show 20 Lines	#if defined(IPSEC) \|\| defined(IPSEC_SUPPORT)
if (ipsec_copy_pcbpolicy(sotoinpcb(lso), inp) != 0)		if (ipsec_copy_pcbpolicy(sotoinpcb(lso), inp) != 0)
printf("syncache_socket: could not copy policy\n");		printf("syncache_socket: could not copy policy\n");
#endif		#endif
INP_HASH_WUNLOCK(&V_tcbinfo);		INP_HASH_WUNLOCK(&V_tcbinfo);
tp = intotcpcb(inp);		tp = intotcpcb(inp);
tcp_state_change(tp, TCPS_SYN_RECEIVED);		tcp_state_change(tp, TCPS_SYN_RECEIVED);
tp->iss = sc->sc_iss;		tp->iss = sc->sc_iss;
tp->irs = sc->sc_irs;		tp->irs = sc->sc_irs;
		tp->t_lasttsval = sc->sc_ts;
tcp_rcvseqinit(tp);		tcp_rcvseqinit(tp);
tcp_sendseqinit(tp);		tcp_sendseqinit(tp);
blk = sototcpcb(lso)->t_fb;		blk = sototcpcb(lso)->t_fb;
if (V_functions_inherit_listen_socket_stack && blk != tp->t_fb) {		if (V_functions_inherit_listen_socket_stack && blk != tp->t_fb) {
/*		/*
* Our parents t_fb was not the default,		* Our parents t_fb was not the default,
* we need to release our ref on tp->t_fb and		* we need to release our ref on tp->t_fb and
* pickup one on the new entry.		* pickup one on the new entry.
Show All 32 Lines	else {
if (sc->sc_flags & SCF_WINSCALE) {		if (sc->sc_flags & SCF_WINSCALE) {
tp->t_flags \|= TF_REQ_SCALE\|TF_RCVD_SCALE;		tp->t_flags \|= TF_REQ_SCALE\|TF_RCVD_SCALE;
tp->snd_scale = sc->sc_requested_s_scale;		tp->snd_scale = sc->sc_requested_s_scale;
tp->request_r_scale = sc->sc_requested_r_scale;		tp->request_r_scale = sc->sc_requested_r_scale;
}		}
if (sc->sc_flags & SCF_TIMESTAMP) {		if (sc->sc_flags & SCF_TIMESTAMP) {
tp->t_flags \|= TF_REQ_TSTMP\|TF_RCVD_TSTMP;		tp->t_flags \|= TF_REQ_TSTMP\|TF_RCVD_TSTMP;
tp->ts_recent = sc->sc_tsreflect;		tp->ts_recent = sc->sc_tsreflect;
tp->ts_recent_age = tcp_ts_getticks();		tp->ts_recent_age = tcp_ts_getsbintime();
tp->ts_offset = sc->sc_tsoff;
}		}
#if defined(IPSEC_SUPPORT) \|\| defined(TCP_SIGNATURE)		#if defined(IPSEC_SUPPORT) \|\| defined(TCP_SIGNATURE)
if (sc->sc_flags & SCF_SIGNATURE)		if (sc->sc_flags & SCF_SIGNATURE)
tp->t_flags \|= TF_SIGNATURE;		tp->t_flags \|= TF_SIGNATURE;
#endif		#endif
if (sc->sc_flags & SCF_SACK)		if (sc->sc_flags & SCF_SACK)
tp->t_flags \|= TF_SACK_PERMIT;		tp->t_flags \|= TF_SACK_PERMIT;
}		}
▲ Show 20 Lines • Show All 588 Lines • ▼ Show 20 Lines	#endif

if (V_tcp_do_rfc1323) {		if (V_tcp_do_rfc1323) {
/*		/*
* A timestamp received in a SYN makes		* A timestamp received in a SYN makes
* it ok to send timestamp requests and replies.		* it ok to send timestamp requests and replies.
*/		*/
if (to->to_flags & TOF_TS) {		if (to->to_flags & TOF_TS) {
sc->sc_tsreflect = to->to_tsval;		sc->sc_tsreflect = to->to_tsval;
sc->sc_ts = tcp_ts_getticks();		sc->sc_ts = TCP_SBT_TO_TS(tcp_ts_getsbintime());
sc->sc_flags \|= SCF_TIMESTAMP;		sc->sc_flags \|= SCF_TIMESTAMP;
}		}
if (to->to_flags & TOF_SCALE) {		if (to->to_flags & TOF_SCALE) {
int wscale = 0;		int wscale = 0;

/*		/*
* Pick the smallest possible scaling factor that		* Pick the smallest possible scaling factor that
* will still allow us to scale up to sb_max, aka		* will still allow us to scale up to sb_max, aka
▲ Show 20 Lines • Show All 520 Lines • ▼ Show 20 Lines	syncookie_generate(struct syncache_head sch, struct syncache sc)
* done to prevent the 8 cookie bits from showing up directly on the		* done to prevent the 8 cookie bits from showing up directly on the
* wire.		* wire.
*/		*/
iss = hash & ~0xff;		iss = hash & ~0xff;
iss \|= cookie.cookie ^ (hash >> 24);		iss \|= cookie.cookie ^ (hash >> 24);

/* Randomize the timestamp. */		/* Randomize the timestamp. */
if (sc->sc_flags & SCF_TIMESTAMP) {		if (sc->sc_flags & SCF_TIMESTAMP) {
sc->sc_ts = arc4random();		sc->sc_ts = TCP_SBT_TO_TS(tcp_ts_getsbintime());
sc->sc_tsoff = sc->sc_ts - tcp_ts_getticks();
}		}

TCPSTAT_INC(tcps_sc_sendcookie);		TCPSTAT_INC(tcps_sc_sendcookie);
return (iss);		return (iss);
}		}

static struct syncache *		static struct syncache *
syncookie_lookup(struct in_conninfo inc, struct syncache_head sch,		syncookie_lookup(struct in_conninfo inc, struct syncache_head sch,
▲ Show 20 Lines • Show All 73 Lines • ▼ Show 20 Lines	#endif

if (cookie.flags.sack_ok)		if (cookie.flags.sack_ok)
sc->sc_flags \|= SCF_SACK;		sc->sc_flags \|= SCF_SACK;

if (to->to_flags & TOF_TS) {		if (to->to_flags & TOF_TS) {
sc->sc_flags \|= SCF_TIMESTAMP;		sc->sc_flags \|= SCF_TIMESTAMP;
sc->sc_tsreflect = to->to_tsval;		sc->sc_tsreflect = to->to_tsval;
sc->sc_ts = to->to_tsecr;		sc->sc_ts = to->to_tsecr;
sc->sc_tsoff = to->to_tsecr - tcp_ts_getticks();		sc->sc_tsoff = to->to_tsecr - TCP_SBT_TO_TS(tcp_ts_getsbintime());
}		}

if (to->to_flags & TOF_SIGNATURE)		if (to->to_flags & TOF_SIGNATURE)
sc->sc_flags \|= SCF_SIGNATURE;		sc->sc_flags \|= SCF_SIGNATURE;

sc->sc_rxmits = 0;		sc->sc_rxmits = 0;

TCPSTAT_INC(tcps_sc_recvcookie);		TCPSTAT_INC(tcps_sc_recvcookie);
▲ Show 20 Lines • Show All 118 Lines • Show Last 20 Lines