D36303.id123352.diff
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	diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4
	--- a/share/man/man4/tcp.4
	+++ b/share/man/man4/tcp.4
	@@ -34,7 +34,7 @@
	.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93
	.\" $FreeBSD$
	.\"
	-.Dd June 6, 2023
	+.Dd June 16, 2023
	.Dt TCP 4
	.Os
	.Sh NAME
	@@ -520,6 +520,9 @@
	specific connection.
	This is needed to help with connection establishment
	when a broken firewall is in the network path.
	+.It Va ecn.option
	+Reflect back the number of received bytes with a particular ECN marking
	+by using the Accurate ECN TCP option on each outgoing packet.
	.It Va fast_finwait2_recycle
	Recycle
	.Tn TCP
	diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h
	--- a/sys/netinet/tcp.h
	+++ b/sys/netinet/tcp.h
	@@ -107,6 +107,10 @@
	#define TCPOLEN_SIGNATURE 18
	#define TCPOPT_FAST_OPEN 34
	#define TCPOLEN_FAST_OPEN_EMPTY 2
	+#define TCPOPT_ACCECN0 0xAC
	+#define TCPOPT_ACCECN1 0XAE
	+#define TCPOLEN_ACCECN_EMPTY 2
	+#define TCPOLEN_ACCECN_COUNTER 3

	#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */

	@@ -417,12 +421,12 @@
	/* Accurate ECN counters. */
	u_int32_t tcpi_delivered_ce;
	u_int32_t tcpi_received_ce; /* # of CE marks received */
	- u_int32_t __tcpi_delivered_e1_bytes;
	- u_int32_t __tcpi_delivered_e0_bytes;
	- u_int32_t __tcpi_delivered_ce_bytes;
	- u_int32_t __tcpi_received_e1_bytes;
	- u_int32_t __tcpi_received_e0_bytes;
	- u_int32_t __tcpi_received_ce_bytes;
	+ u_int32_t tcpi_delivered_e1_bytes;
	+ u_int32_t tcpi_delivered_e0_bytes;
	+ u_int32_t tcpi_delivered_ce_bytes;
	+ u_int32_t tcpi_received_e1_bytes;
	+ u_int32_t tcpi_received_e0_bytes;
	+ u_int32_t tcpi_received_ce_bytes;

	u_int32_t tcpi_total_tlp; /* tail loss probes sent */
	u_int64_t tcpi_total_tlp_bytes; /* tail loss probe bytes sent */
	diff --git a/sys/netinet/tcp_ecn.h b/sys/netinet/tcp_ecn.h
	--- a/sys/netinet/tcp_ecn.h
	+++ b/sys/netinet/tcp_ecn.h
	@@ -51,6 +51,24 @@
	uint16_t tcp_ecn_syncache_respond(uint16_t, struct syncache *);
	int tcp_ecn_get_ace(uint16_t);

	+static inline void hton24(u_char **p, uint32_t v)
	+{
	+ (p)++ = (u_char)(v >> 16);
	+ (p)++ = (u_char)(v >> 8);
	+ (p)++ = (u_char)(v);
	+}
	+
	+static inline uint32_t ntoh24(u_char *p)
	+{
	+ uint32_t v;
	+
	+ v = (uint32_t)(p[0] << 16);
	+ v \|= (uint32_t)(p[1] << 8);
	+ v \|= (uint32_t)(p[2] << 0);
	+ return v;
	+}
	+
	+
	#endif /* _KERNEL */

	#endif /* _NETINET_TCP_ECN_H_ */
	diff --git a/sys/netinet/tcp_ecn.c b/sys/netinet/tcp_ecn.c
	--- a/sys/netinet/tcp_ecn.c
	+++ b/sys/netinet/tcp_ecn.c
	@@ -114,13 +114,17 @@
	CTLFLAG_VNET \| CTLFLAG_RW, &VNET_NAME(tcp_ecn_maxretries), 0,
	"Max retries before giving up on ECN");

	+VNET_DEFINE(int, tcp_ecn_option) = 0;
	+SYSCTL_INT(_net_inet_tcp_ecn, OID_AUTO, option,
	+ CTLFLAG_VNET \| CTLFLAG_RW, &VNET_NAME(tcp_ecn_option), 0,
	+ "Use AccECN TCP option");
	+
	/*
	* Process incoming SYN,ACK packet
	*/
	void
	tcp_ecn_input_syn_sent(struct tcpcb *tp, uint16_t thflags, int iptos)
	{
	-
	if (V_tcp_do_ecn == 0)
	return;
	if ((V_tcp_do_ecn == 1) \|\|
	@@ -298,11 +302,23 @@
	TCPSTAT_INC(tcps_ecn_rcvect1);
	break;
	}
	-
	if (tp->t_flags2 & (TF2_ECN_PERMIT \| TF2_ACE_PERMIT)) {
	if (tp->t_flags2 & TF2_ACE_PERMIT) {
	- if ((iptos & IPTOS_ECN_MASK) == IPTOS_ECN_CE)
	- tp->t_rcep += 1;
	+ switch (iptos & IPTOS_ECN_MASK) {
	+ case IPTOS_ECN_CE:
	+ tp->t_flags2 \|= TF2_ACO_CE;
	+ tp->t_ae.rceb += tlen;
	+ tp->t_rcep++;
	+ break;
	+ case IPTOS_ECN_ECT0:
	+ tp->t_flags2 \|= TF2_ACO_E0;
	+ tp->t_ae.re0b += tlen;
	+ break;
	+ case IPTOS_ECN_ECT1:
	+ tp->t_flags2 \|= TF2_ACO_E1;
	+ tp->t_ae.re1b += tlen;
	+ break;
	+ }
	if (tp->t_flags2 & TF2_ECN_PERMIT) {
	delta_cep = (tcp_ecn_get_ace(thflags) + 8 -
	(tp->t_scep & 7)) & 7;
	@@ -450,7 +466,6 @@
	if (tp->t_flags2 & TF2_ECN_SND_ECE)
	*thflags \|= TH_ECE;
	}
	-
	return ipecn;
	}

	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -1003,6 +1003,8 @@
	}

	tp = intotcpcb(inp);
	+ to.to_ae = &tp->t_ae;
	+
	switch (tp->t_state) {
	case TCPS_TIME_WAIT:
	/*
	@@ -1542,6 +1544,7 @@
	thflags = tcp_get_flags(th);
	tp->sackhint.last_sack_ack = 0;
	sack_changed = 0;
	+ to.to_ae = &tp->t_ae;
	nsegs = max(1, m->m_pkthdr.lro_nsegs);

	NET_EPOCH_ASSERT();
	@@ -3429,7 +3432,7 @@
	void
	tcp_dooptions(struct tcpopt to, u_char cp, int cnt, int flags)
	{
	- int opt, optlen;
	+ int opt, optlen, tmp;

	to->to_flags = 0;
	for (; cnt > 0; cnt -= optlen, cp += optlen) {
	@@ -3522,6 +3525,42 @@
	to->to_tfo_len = optlen - 2;
	to->to_tfo_cookie = to->to_tfo_len ? cp + 2 : NULL;
	break;
	+ case TCPOPT_ACCECN0:
	+ case TCPOPT_ACCECN1:
	+ if (optlen >= (TCPOLEN_ACCECN_EMPTY +
	+ 1 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = ntoh24(cp + TCPOLEN_ACCECN_EMPTY + 0);
	+ if (opt == TCPOPT_ACCECN0) {
	+ tmp -= (to->to_ae->se0b & 0xFFFFFF);
	+ if (tmp > 0)
	+ to->to_ae->se0b += tmp;
	+ } else {
	+ tmp -= (to->to_ae->se1b & 0xFFFFFF);
	+ if (tmp > 0)
	+ to->to_ae->se1b += tmp;
	+ }
	+ }
	+ if (optlen >= (TCPOLEN_ACCECN_EMPTY +
	+ 2 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = ntoh24(cp + TCPOLEN_ACCECN_EMPTY + 3);
	+ tmp -= (to->to_ae->sceb & 0xFFFFFF);
	+ if (tmp > 0)
	+ to->to_ae->sceb += tmp;
	+ }
	+ if (optlen >= (TCPOLEN_ACCECN_EMPTY +
	+ 3 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = ntoh24(cp + TCPOLEN_ACCECN_EMPTY + 6);
	+ if (opt == TCPOPT_ACCECN0) {
	+ tmp -= (to->to_ae->se1b & 0xFFFFFF);
	+ if (tmp > 0)
	+ to->to_ae->se1b += tmp;
	+ } else {
	+ tmp -= (to->to_ae->se0b & 0xFFFFFF);
	+ if (tmp > 0)
	+ to->to_ae->se0b += tmp;
	+ }
	+ }
	+ break;
	default:
	continue;
	}
	diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
	--- a/sys/netinet/tcp_output.c
	+++ b/sys/netinet/tcp_output.c
	@@ -880,9 +880,35 @@
	if (tp->t_flags & TF_SIGNATURE)
	to.to_flags \|= TOF_SIGNATURE;
	#endif /* TCP_SIGNATURE */
	-
	+ /*
	+ * AccECN option
	+ * Don't send on <SYN>, only on <SYN,ACK> or
	+ * when doing an AccECN session
	+ */
	+ if (V_tcp_ecn_option &&
	+ ((V_tcp_do_ecn == 3) \|\| (V_tcp_do_ecn == 4)) &&
	+ ((tp->t_flags2 & TF2_ACE_PERMIT) \|\|
	+ ((flags & TH_SYN) && (flags & TH_ACK)))) {
	+ to.to_flags \|= TOF_ACCECNOPT;
	+ to.to_ae = &tp->t_ae;
	+ to.to_flags \|= ((tp->t_flags2 & TF2_ACO_E0) ? TOF_ACCE_E0 : 0) \|
	+ ((tp->t_flags2 & TF2_ACO_E1) ? TOF_ACCE_E1 : 0) \|
	+ ((tp->t_flags2 & TF2_ACO_CE) ? TOF_ACCE_CE : 0);
	+ if (flags & TH_SYN)
	+ to.to_flags \|= TOF_ACCE_SYN;
	+ if (tp->t_flags & TF_ACKNOW)
	+ to.to_flags \|= TOF_ACCE_ACKNOW;
	+ }
	/* Processing the options. */
	hdrlen += optlen = tcp_addoptions(&to, opt);
	+ if (to.to_flags & TOF_ACCECNOPT) {
	+ if ((to.to_flags & TOF_ACCE_E0) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_E0;
	+ if ((to.to_flags & TOF_ACCE_E1) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_E1;
	+ if ((to.to_flags & TOF_ACCE_CE) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_CE;
	+ }
	/*
	* If we wanted a TFO option to be added, but it was unable
	* to fit, ensure no data is sent.
	@@ -1921,6 +1947,78 @@
	optlen += total_len;
	break;
	}
	+ case TOF_ACCECNOPT:
	+ {
	+ int tmp = 0;
	+ int max_len = TCP_MAXOLEN - optlen;
	+ if (max_len < TCPOLEN_ACCECN_EMPTY) {
	+ to->to_flags &= ~TOF_ACCECNOPT;
	+ continue;
	+ }
	+ if (max_len < (TCPOLEN_ACCECN_EMPTY +
	+ 1 * TCPOLEN_ACCECN_COUNTER)) {
	+ if (to->to_flags & TOF_ACCE_SYN) {
	+ *optp++ = TCPOPT_ACCECN0;
	+ optlen += TCPOLEN_ACCECN_EMPTY;
	+ *optp++ = TCPOLEN_ACCECN_EMPTY;
	+ continue;
	+ } else {
	+ to->to_flags &= ~TOF_ACCECNOPT;
	+ continue;
	+ }
	+ }
	+ *optp++ = (to->to_flags & TOF_ACCE_E1) ?
	+ TCPOPT_ACCECN1 : TCPOPT_ACCECN0;
	+ if (max_len >= (TCPOLEN_ACCECN_EMPTY +
	+ 3 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = TCPOLEN_ACCECN_EMPTY +
	+ 3 * TCPOLEN_ACCECN_COUNTER;
	+ } else
	+ if (max_len >= (TCPOLEN_ACCECN_EMPTY +
	+ 2 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = TCPOLEN_ACCECN_EMPTY +
	+ 2 * TCPOLEN_ACCECN_COUNTER;
	+ } else
	+ if (max_len >= (TCPOLEN_ACCECN_EMPTY +
	+ 1 * TCPOLEN_ACCECN_COUNTER)) {
	+ tmp = TCPOLEN_ACCECN_EMPTY +
	+ 1 * TCPOLEN_ACCECN_COUNTER;
	+ }
	+ *optp++ = tmp;
	+ optlen += tmp;
	+ if (to->to_flags & TOF_ACCE_E1) {
	+ hton24(&optp, to->to_ae->re1b);
	+ } else {
	+ hton24(&optp, to->to_ae->re0b);
	+ to->to_flags &= ~TOF_ACCE_E0;
	+ }
	+ if (max_len < (TCPOLEN_ACCECN_EMPTY +
	+ 2 * TCPOLEN_ACCECN_COUNTER)) {
	+ to->to_flags &= ~TOF_ACCE_E1;
	+ continue;
	+ }
	+ hton24(&optp, to->to_ae->rceb);
	+ to->to_flags &= ~TOF_ACCE_CE;
	+ if (max_len < (TCPOLEN_ACCECN_EMPTY +
	+ 3 * TCPOLEN_ACCECN_COUNTER)) {
	+ to->to_flags &= ~TOF_ACCE_E1;
	+ continue;
	+ }
	+ /*
	+ * TCP option sufficient to hold full AccECN option
	+ * but only send changed counters normally,
	+ * full counters on ACKNOW
	+ */
	+ if (to->to_flags & TOF_ACCE_E1) {
	+ hton24(&optp, to->to_ae->re0b);
	+ to->to_flags &= ~TOF_ACCE_E0;
	+ to->to_flags &= ~TOF_ACCE_E1;
	+ continue;
	+ } else {
	+ hton24(&optp, to->to_ae->re1b);
	+ continue;
	+ }
	+ }
	default:
	panic("%s: unknown TCP option type", __func__);
	break;
	diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
	--- a/sys/netinet/tcp_subr.c
	+++ b/sys/netinet/tcp_subr.c
	@@ -1810,7 +1810,6 @@
	#ifdef INVARIANTS
	int thflags = tcp_get_flags(th);
	#endif
	-
	KASSERT(tp != NULL \|\| m != NULL, ("tcp_respond: tp and m both NULL"));
	NET_EPOCH_ASSERT();

	@@ -2018,9 +2017,26 @@
	if (tp->t_flags & TF_SIGNATURE)
	to.to_flags \|= TOF_SIGNATURE;
	#endif
	+ /* AccECN option */
	+ if (V_tcp_ecn_option &&
	+ ((V_tcp_do_ecn == 3) \|\| (V_tcp_do_ecn == 4)) &&
	+ (tp->t_flags2 & TF2_ACE_PERMIT)) {
	+ to.to_flags \|= TOF_ACCECNOPT;
	+ to.to_ae = &tp->t_ae;
	+ to.to_flags \|= ((tp->t_flags2 & TF2_ACO_E0) ? TOF_ACCE_E0 : 0) \|
	+ ((tp->t_flags2 & TF2_ACO_E1) ? TOF_ACCE_E1 : 0) \|
	+ ((tp->t_flags2 & TF2_ACO_CE) ? TOF_ACCE_CE : 0);
	+ }
	/* Add the options. */
	tlen += optlen = tcp_addoptions(&to, optp);
	-
	+ if (to.to_flags & TOF_ACCECNOPT) {
	+ if ((to.to_flags & TOF_ACCE_E0) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_E0;
	+ if ((to.to_flags & TOF_ACCE_E1) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_E1;
	+ if ((to.to_flags & TOF_ACCE_CE) == 0)
	+ tp->t_flags2 &= ~TF2_ACO_CE;
	+ }
	/* Update m_len in the correct mbuf. */
	optm->m_len += optlen;
	} else
	@@ -2335,6 +2351,14 @@
	tcp_log_tcpcbinit(tp);
	#endif
	tp->t_pacing_rate = -1;
	+ if (V_tcp_do_lrd)
	+ tp->t_flags \|= TF_LRD;
	+ tp->t_ae.re0b = 1;
	+ tp->t_ae.re1b = 1;
	+ tp->t_ae.rceb = 0;
	+ tp->t_ae.se0b = 1;
	+ tp->t_ae.se1b = 1;
	+ tp->t_ae.sceb = 0;
	if (tp->t_fb->tfb_tcp_fb_init) {
	if ((*tp->t_fb->tfb_tcp_fb_init)(tp, &tp->t_fb_ptr)) {
	refcount_release(&tp->t_fb->tfb_refcnt);
	diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c
	--- a/sys/netinet/tcp_syncache.c
	+++ b/sys/netinet/tcp_syncache.c
	@@ -1825,6 +1825,7 @@
	#ifdef INET6
	struct ip6_hdr *ip6 = NULL;
	#endif
	+ struct accecn ae;

	NET_EPOCH_ASSERT();

	@@ -1964,6 +1965,20 @@
	/* don't send cookie again when retransmitting response */
	sc->sc_tfo_cookie = NULL;
	}
	+ if (V_tcp_ecn_option)
	+ to.to_flags \|= TOF_ACCE_SYN;
	+ }
	+ if (V_tcp_ecn_option &&
	+ (sc->sc_flags & SCF_ECN_MASK) &&
	+ ((sc->sc_flags & SCF_ECN_MASK) != SCF_ECN)) {
	+ to.to_flags \|= TOF_ACCECNOPT;
	+ to.to_flags \|= TOF_ACCE_E0 \|
	+ TOF_ACCE_E1 \|
	+ TOF_ACCE_CE;
	+ ae.re0b = 1;
	+ ae.re1b = 1;
	+ ae.rceb = 0;
	+ to.to_ae = &ae;
	}
	if (sc->sc_flags & SCF_TIMESTAMP) {
	to.to_tsval = sc->sc_tsoff + tcp_ts_getticks();
	diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
	--- a/sys/netinet/tcp_usrreq.c
	+++ b/sys/netinet/tcp_usrreq.c
	@@ -1590,15 +1590,23 @@
	* AccECN related counters.
	*/
	if ((tp->t_flags2 & (TF2_ECN_PERMIT \| TF2_ACE_PERMIT)) ==
	- (TF2_ECN_PERMIT \| TF2_ACE_PERMIT))
	+ (TF2_ECN_PERMIT \| TF2_ACE_PERMIT)) {
	/*
	* Internal counter starts at 5 for AccECN
	* but 0 for RFC3168 ECN.
	*/
	ti->tcpi_delivered_ce = tp->t_scep - 5;
	- else
	+ ti->tcpi_received_ce = tp->t_rcep - 5;
	+ } else {
	ti->tcpi_delivered_ce = tp->t_scep;
	- ti->tcpi_received_ce = tp->t_rcep;
	+ ti->tcpi_received_ce = tp->t_rcep;
	+ }
	+ ti->tcpi_received_e0_bytes = tp->t_ae.re0b - 1;
	+ ti->tcpi_received_e1_bytes = tp->t_ae.re1b - 1;
	+ ti->tcpi_received_ce_bytes = tp->t_ae.rceb;
	+ ti->tcpi_delivered_e0_bytes = tp->t_ae.se0b - 1;
	+ ti->tcpi_delivered_e1_bytes = tp->t_ae.se1b - 1;
	+ ti->tcpi_delivered_ce_bytes = tp->t_ae.sceb;
	}

	/*
	diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
	--- a/sys/netinet/tcp_var.h
	+++ b/sys/netinet/tcp_var.h
	@@ -131,6 +131,15 @@
	uint32_t prr_out; /* Bytes sent during IN_RECOVERY */
	};

	+struct accecn {
	+ uint32_t re0b; /* Number of ECT0 marked data bytes */
	+ uint32_t re1b; /* Number of ECT1 marked data bytes */
	+ uint32_t rceb; /* Number of CE marked data bytes */
	+ uint32_t se0b; /* Synced number of delivered ECT0 bytes */
	+ uint32_t se1b; /* Synced number of delivered ECT1 bytes */
	+ uint32_t sceb; /* Synced number of delivered CE bytes */
	+};
	+
	#define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)

	STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
	@@ -435,6 +444,7 @@
	int t_loglimit; /* Maximum number of log entries */
	uint32_t t_rcep; /* Number of received CE marked pkts */
	uint32_t t_scep; /* Synced number of delivered CE pkts */
	+ struct accecn t_ae; /* AccECN related byte counters */
	int64_t t_pacing_rate; /* bytes / sec, -1 => unlimited */
	struct tcp_log_stailq t_logs; /* Log buffer */
	struct tcp_log_id_node *t_lin;
	@@ -847,7 +857,9 @@
	#define TF2_MBUF_QUEUE_READY 0x00020000 /* Inputs can be queued */
	#define TF2_DONT_SACK_QUEUE 0x00040000 /* Don't wake on sack */
	#define TF2_CANNOT_DO_ECN 0x00080000 /* The stack does not do ECN */
	-
	+#define TF2_ACO_E0 0x00100000 /* EE0 counter changed */
	+#define TF2_ACO_E1 0x00200000 /* EE1 counter changed */
	+#define TF2_ACO_CE 0x00400000 /* ECE counter changed */
	/*
	* Structure to hold TCP options that are only used during segment
	* processing (in tcp_input), but not held in the tcpcb.
	@@ -858,14 +870,21 @@
	*/
	struct tcpopt {
	u_int32_t to_flags; /* which options are present */
	-#define TOF_MSS 0x0001 /* maximum segment size */
	-#define TOF_SCALE 0x0002 /* window scaling */
	-#define TOF_SACKPERM 0x0004 /* SACK permitted */
	-#define TOF_TS 0x0010 /* timestamp */
	-#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
	-#define TOF_SACK 0x0080 /* Peer sent SACK option */
	-#define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
	-#define TOF_MAXOPT 0x0200
	+#define TOF_MSS 0x00000001 /* maximum segment size */
	+#define TOF_SCALE 0x00000002 /* window scaling */
	+#define TOF_SACKPERM 0x00000004 /* SACK permitted */
	+#define TOF_TS 0x00000010 /* timestamp */
	+#define TOF_SIGNATURE 0x00000040 /* TCP-MD5 signature option (RFC2385) */
	+#define TOF_SACK 0x00000080 /* Peer sent SACK option */
	+#define TOF_FASTOPEN 0x00000100 /* TCP Fast Open (TFO) cookie */
	+#define TOF_ACCECNOPT 0x00000200 /* AccECN Option */
	+#define TOF_MAXOPT 0x00000400
	+ /* Keep internal flags above TOF_MAXOPT */
	+#define TOF_ACCE_SYN 0x80000000 /* send empty option */
	+#define TOF_ACCE_CE 0x40000000 /* CE counter changed */
	+#define TOF_ACCE_E0 0x20000000 /* E0 counter changed */
	+#define TOF_ACCE_E1 0x10000000 /* E1 counter changed */
	+#define TOF_ACCE_ACKNOW 0x08000000 /* send full option */
	u_int32_t to_tsval; /* new timestamp */
	u_int32_t to_tsecr; /* reflected timestamp */
	u_char to_sacks; / pointer to the first SACK blocks */
	@@ -875,7 +894,8 @@
	u_int8_t to_wscale; /* window scaling */
	u_int8_t to_nsacks; /* number of SACK blocks */
	u_int8_t to_tfo_len; /* TFO cookie length */
	- u_int32_t to_spare; /* UTO */
	+ struct accecn to_ae; / pointer to AccECN byte counters */
	+ u_int32_t to_spare; /* UTO */
	};

	/*
	@@ -1277,6 +1297,7 @@
	VNET_DECLARE(int, tcp_do_sack);
	VNET_DECLARE(int, tcp_do_tso);
	VNET_DECLARE(int, tcp_ecn_maxretries);
	+VNET_DECLARE(int, tcp_ecn_option);
	VNET_DECLARE(int, tcp_initcwnd_segments);
	VNET_DECLARE(int, tcp_insecure_rst);
	VNET_DECLARE(int, tcp_insecure_syn);
	@@ -1324,6 +1345,7 @@
	#define V_tcp_do_sack VNET(tcp_do_sack)
	#define V_tcp_do_tso VNET(tcp_do_tso)
	#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
	+#define V_tcp_ecn_option VNET(tcp_ecn_option)
	#define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
	#define V_tcp_insecure_rst VNET(tcp_insecure_rst)
	#define V_tcp_insecure_syn VNET(tcp_insecure_syn)

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