tcp: add SYN/data info to TCP_INFO

Add a bit TCPI_OPT_SYN_DATA (32) to the socket option TCP_INFO:tcpi_options. It's set if the data in SYN (sent or received) is acked by SYN-ACK. Server or client application can use this information to check Fast Open success rate.

Yuchung Cheng committed 14 years ago

Commit 6f736011 parent e6e71056 files · +8 −1Browse files

Unified · Split

6 files

include/linux/tcp.h +2 −1
include/uapi/linux/tcp.h +1 −0
net/ipv4/tcp.c +2 −0
net/ipv4/tcp_input.c +1 −0
net/ipv4/tcp_ipv4.c +1 −0
net/ipv4/tcp_minisocks.c +1 −0

include/linux/tcp.h+2−1

@@ -191,7 +191,8 @@ struct tcp_sock { · 190 unmodified lines
191	191	u8 do_early_retrans:1,/* Enable RFC5827 early-retransmit */
192	192	early_retrans_delayed:1, /* Delayed ER timer installed */
193	193	syn_data:1, /* SYN includes data */
194		− syn_fastopen:1; /* SYN includes Fast Open option */
	194	+ syn_fastopen:1, /* SYN includes Fast Open option */
	195	+ syn_data_acked:1;/* data in SYN is acked by SYN-ACK */
195	196
196	197	/* RTT measurement */
197	198	u32 srtt; /* smoothed round trip time << 3 */

include/uapi/linux/tcp.h+1−0

@@ -130,6 +130,7 @@ enum { · 129 unmodified lines
130	130	#define TCPI_OPT_WSCALE 4
131	131	#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
132	132	#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
	133	+#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
133	134
134	135	enum tcp_ca_state {
135	136	TCP_CA_Open = 0,

net/ipv4/tcp.c+2−0

@@ -2764,6 +2764,8 @@ void tcp_get_info(const struct sock sk, struct tcp_info info) · 2763 unmodified lines
2764	2764	info->tcpi_options \|= TCPI_OPT_ECN;
2765	2765	if (tp->ecn_flags & TCP_ECN_SEEN)
2766	2766	info->tcpi_options \|= TCPI_OPT_ECN_SEEN;
	2767	+ if (tp->syn_data_acked)
	2768	+ info->tcpi_options \|= TCPI_OPT_SYN_DATA;
2767	2769
2768	2770	info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto);
2769	2771	info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato);

net/ipv4/tcp_input.c+1−0

@@ -5646,6 +5646,7 @@ static bool tcp_rcv_fastopen_synack(struct sock sk, struct sk_buff synack, · 5645 unmodified lines
5646	5646	tcp_rearm_rto(sk);
5647	5647	return true;
5648	5648	}
	5649	+ tp->syn_data_acked = tp->syn_data;
5649	5650	return false;
5650	5651	}
5651	5652

net/ipv4/tcp_ipv4.c+1−0

@@ -1461,6 +1461,7 @@ static int tcp_v4_conn_req_fastopen(struct sock *sk, · 1460 unmodified lines
1461	1461	skb_set_owner_r(skb, child);
1462	1462	__skb_queue_tail(&child->sk_receive_queue, skb);
1463	1463	tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
	1464	+ tp->syn_data_acked = 1;
1464	1465	}
1465	1466	sk->sk_data_ready(sk, 0);
1466	1467	bh_unlock_sock(child);

net/ipv4/tcp_minisocks.c+1−0

@@ -510,6 +510,7 @@ struct sock tcp_create_openreq_child(struct sock sk, struct request_sock *req, · 509 unmodified lines
510	510	newtp->rx_opt.mss_clamp = req->mss;
511	511	TCP_ECN_openreq_child(newtp, req);
512	512	newtp->fastopen_rsk = NULL;
	513	+ newtp->syn_data_acked = 0;
513	514
514	515	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_PASSIVEOPENS);
515	516	}