Differential D4350 Diff 10678 sys/netinet/tcp_output.c

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sys/netinet/tcp_output.c

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#include <netinet/in_pcb.h>		#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>		#include <netinet/ip_var.h>
#include <netinet/ip_options.h>		#include <netinet/ip_options.h>
#ifdef INET6		#ifdef INET6
#include <netinet6/in6_pcb.h>		#include <netinet6/in6_pcb.h>
#include <netinet/ip6.h>		#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>		#include <netinet6/ip6_var.h>
#endif		#endif
		#ifdef TCP_RFC7413
		#include <netinet/tcp_fastopen.h>
		#endif
#define TCPOUTFLAGS		#define TCPOUTFLAGS
#include <netinet/tcp_fsm.h>		#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>		#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>		#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>		#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>		#include <netinet/tcpip.h>
#ifdef TCPPCAP		#ifdef TCPPCAP
#include <netinet/tcp_pcap.h>		#include <netinet/tcp_pcap.h>
▲ Show 20 Lines • Show All 120 Lines • ▼ Show 20 Lines	#endif

INP_WLOCK_ASSERT(tp->t_inpcb);		INP_WLOCK_ASSERT(tp->t_inpcb);

#ifdef TCP_OFFLOAD		#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE)		if (tp->t_flags & TF_TOE)
return (tcp_offload_output(tp));		return (tcp_offload_output(tp));
#endif		#endif

		#ifdef TCP_RFC7413
/*		/*
		* For TFO connections in SYN_RECEIVED, only allow the initial
		* SYN\|ACK and those sent by the retransmit timer.
		*/
		if ((tp->t_flags & TF_FASTOPEN) &&
		(tp->t_state == TCPS_SYN_RECEIVED) &&
		SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN\|ACK sent */
		(tp->snd_nxt != tp->snd_una)) /* not a retransmit */
		return (0);
		#endif
		/*
* Determine length of data that should be transmitted,		* Determine length of data that should be transmitted,
* and flags that will be used.		* and flags that will be used.
* If there is some data or critical controls (SYN, RST)		* If there is some data or critical controls (SYN, RST)
* to send, then transmit; otherwise, investigate further.		* to send, then transmit; otherwise, investigate further.
*/		*/
idle = (tp->t_flags & TF_LASTIDLE) \|\| (tp->snd_max == tp->snd_una);		idle = (tp->t_flags & TF_LASTIDLE) \|\| (tp->snd_max == tp->snd_una);
if (idle && ticks - tp->t_rcvtime >= tp->t_rxtcur)		if (idle && ticks - tp->t_rcvtime >= tp->t_rxtcur)
cc_after_idle(tp);		cc_after_idle(tp);
▲ Show 20 Lines • Show All 169 Lines • ▼ Show 20 Lines	after_sack_rexmit:
/*		/*
* Lop off SYN bit if it has already been sent. However, if this		* Lop off SYN bit if it has already been sent. However, if this
* is SYN-SENT state and if segment contains data and if we don't		* is SYN-SENT state and if segment contains data and if we don't
* know that foreign host supports TAO, suppress sending segment.		* know that foreign host supports TAO, suppress sending segment.
*/		*/
if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {		if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
if (tp->t_state != TCPS_SYN_RECEIVED)		if (tp->t_state != TCPS_SYN_RECEIVED)
flags &= ~TH_SYN;		flags &= ~TH_SYN;
		#ifdef TCP_RFC7413
		/*
		* When sending additional segments following a TFO SYN\|ACK,
		* do not include the SYN bit.
		*/
		if ((tp->t_flags & TF_FASTOPEN) &&
		(tp->t_state == TCPS_SYN_RECEIVED))
		flags &= ~TH_SYN;
		#endif
off--, len++;		off--, len++;
}		}

/*		/*
* Be careful not to send data and/or FIN on SYN segments.		* Be careful not to send data and/or FIN on SYN segments.
* This measure is needed to prevent interoperability problems		* This measure is needed to prevent interoperability problems
* with not fully conformant TCP implementations.		* with not fully conformant TCP implementations.
*/		*/
if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {		if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {
len = 0;		len = 0;
flags &= ~TH_FIN;		flags &= ~TH_FIN;
}		}

		#ifdef TCP_RFC7413
		/*
		* When retransmitting SYN\|ACK on a passively-created TFO socket,
		* don't include data, as the presence of data may have caused the
		* original SYN\|ACK to have been dropped by a middlebox.
		*/
		if ((tp->t_flags & TF_FASTOPEN) &&
		(((tp->t_state == TCPS_SYN_RECEIVED) && (tp->t_rxtshift > 0)) \|\|
		(flags & TH_RST)))
		len = 0;
		#endif
if (len <= 0) {		if (len <= 0) {
/*		/*
* If FIN has been sent but not acked,		* If FIN has been sent but not acked,
* but we haven't been called to retransmit,		* but we haven't been called to retransmit,
* len will be < 0. Otherwise, window shrank		* len will be < 0. Otherwise, window shrank
* after we sent into it. If window shrank to 0,		* after we sent into it. If window shrank to 0,
* cancel pending retransmit, pull snd_nxt back		* cancel pending retransmit, pull snd_nxt back
* to (closed) window, and set the persist timer		* to (closed) window, and set the persist timer
▲ Show 20 Lines • Show All 306 Lines • ▼ Show 20 Lines	#endif
*/		*/
if ((tp->t_flags & TF_NOOPT) == 0) {		if ((tp->t_flags & TF_NOOPT) == 0) {
to.to_flags = 0;		to.to_flags = 0;
/* Maximum segment size. */		/* Maximum segment size. */
if (flags & TH_SYN) {		if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;		tp->snd_nxt = tp->iss;
to.to_mss = tcp_mssopt(&tp->t_inpcb->inp_inc);		to.to_mss = tcp_mssopt(&tp->t_inpcb->inp_inc);
to.to_flags \|= TOF_MSS;		to.to_flags \|= TOF_MSS;
		#ifdef TCP_RFC7413
		/*
		* Only include the TFO option on the first
		* transmission of the SYN\|ACK on a
		* passively-created TFO socket, as the presence of
		* the TFO option may have caused the original
		* SYN\|ACK to have been dropped by a middlebox.
		*/
		if ((tp->t_flags & TF_FASTOPEN) &&
		(tp->t_state == TCPS_SYN_RECEIVED) &&
		(tp->t_rxtshift == 0)) {
		to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN;
		to.to_tfo_cookie = (u_char *)&tp->t_tfo_cookie;
		to.to_flags \|= TOF_FASTOPEN;
}		}
		#endif
		}
/* Window scaling. */		/* Window scaling. */
if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {		if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {
to.to_wscale = tp->request_r_scale;		to.to_wscale = tp->request_r_scale;
to.to_flags \|= TOF_SCALE;		to.to_flags \|= TOF_SCALE;
}		}
/* Timestamps. */		/* Timestamps. */
if ((tp->t_flags & TF_RCVD_TSTMP) \|\|		if ((tp->t_flags & TF_RCVD_TSTMP) \|\|
((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {		((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {
▲ Show 20 Lines • Show All 262 Lines • ▼ Show 20 Lines	#endif
}		}

/*		/*
* If we're sending everything we've got, set PUSH.		* If we're sending everything we've got, set PUSH.
* (This will keep happy those implementations which only		* (This will keep happy those implementations which only
* give data to the user when a buffer fills or		* give data to the user when a buffer fills or
* a PUSH comes in.)		* a PUSH comes in.)
*/		*/
if (off + len == sbused(&so->so_snd))		if ((off + len == sbused(&so->so_snd)) && !(flags & TH_SYN))
flags \|= TH_PUSH;		flags \|= TH_PUSH;
SOCKBUF_UNLOCK(&so->so_snd);		SOCKBUF_UNLOCK(&so->so_snd);
} else {		} else {
SOCKBUF_UNLOCK(&so->so_snd);		SOCKBUF_UNLOCK(&so->so_snd);
if (tp->t_flags & TF_ACKNOW)		if (tp->t_flags & TF_ACKNOW)
TCPSTAT_INC(tcps_sndacks);		TCPSTAT_INC(tcps_sndacks);
else if (flags & (TH_SYN\|TH_FIN\|TH_RST))		else if (flags & (TH_SYN\|TH_FIN\|TH_RST))
TCPSTAT_INC(tcps_sndctrl);		TCPSTAT_INC(tcps_sndctrl);
▲ Show 20 Lines • Show All 690 Lines • ▼ Show 20 Lines	case TOF_SACK:
bcopy((u_char *)&sack_seq, optp, sizeof(sack_seq));		bcopy((u_char *)&sack_seq, optp, sizeof(sack_seq));
optp += sizeof(sack_seq);		optp += sizeof(sack_seq);
optlen += TCPOLEN_SACK;		optlen += TCPOLEN_SACK;
sack++;		sack++;
}		}
TCPSTAT_INC(tcps_sack_send_blocks);		TCPSTAT_INC(tcps_sack_send_blocks);
break;		break;
}		}
		#ifdef TCP_RFC7413
		case TOF_FASTOPEN:
		{
		int total_len;

		/* XXX is there any point to aligning this option? */
		total_len = TCPOLEN_FAST_OPEN_EMPTY + to->to_tfo_len;
		if (TCP_MAXOLEN - optlen < total_len)
		continue;
		*optp++ = TCPOPT_FAST_OPEN;
		*optp++ = total_len;
		if (to->to_tfo_len > 0) {
		bcopy(to->to_tfo_cookie, optp, to->to_tfo_len);
		optp += to->to_tfo_len;
		}
		optlen += total_len;
		break;
		}
		#endif
default:		default:
panic("%s: unknown TCP option type", __func__);		panic("%s: unknown TCP option type", __func__);
break;		break;
}		}
}		}

/* Terminate and pad TCP options to a 4 byte boundary. */		/* Terminate and pad TCP options to a 4 byte boundary. */
if (optlen % 4) {		if (optlen % 4) {
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