ss: add fastopen support

ss -i can output "fastopen" attribute if socket used Fast Open
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

include/linux/tcp.h

+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		Definitions for the TCP protocol.
+ *
+ * Version:	@(#)tcp.h	1.0.2	04/28/93
+ *
+ * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+#ifndef _LINUX_TCP_H
+#define _LINUX_TCP_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include <linux/socket.h>
+
+struct tcphdr {
+	__be16	source;
+	__be16	dest;
+	__be32	seq;
+	__be32	ack_seq;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	__u16	res1:4,
+		doff:4,
+		fin:1,
+		syn:1,
+		rst:1,
+		psh:1,
+		ack:1,
+		urg:1,
+		ece:1,
+		cwr:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	__u16	doff:4,
+		res1:4,
+		cwr:1,
+		ece:1,
+		urg:1,
+		ack:1,
+		psh:1,
+		rst:1,
+		syn:1,
+		fin:1;
+#else
+#error	"Adjust your <asm/byteorder.h> defines"
+#endif	
+	__be16	window;
+	__sum16	check;
+	__be16	urg_ptr;
+};
+
+/*
+ *	The union cast uses a gcc extension to avoid aliasing problems
+ *  (union is compatible to any of its members)
+ *  This means this part of the code is -fstrict-aliasing safe now.
+ */
+union tcp_word_hdr { 
+	struct tcphdr hdr;
+	__be32 		  words[5];
+}; 
+
+#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
+
+enum { 
+	TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
+	TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
+	TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
+	TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
+	TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
+	TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
+	TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
+	TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
+	TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
+	TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
+}; 
+
+/*
+ * TCP general constants
+ */
+#define TCP_MSS_DEFAULT		 536U	/* IPv4 (RFC1122, RFC2581) */
+#define TCP_MSS_DESIRED		1220U	/* IPv6 (tunneled), EDNS0 (RFC3226) */
+
+/* TCP socket options */
+#define TCP_NODELAY		1	/* Turn off Nagle's algorithm. */
+#define TCP_MAXSEG		2	/* Limit MSS */
+#define TCP_CORK		3	/* Never send partially complete segments */
+#define TCP_KEEPIDLE		4	/* Start keeplives after this period */
+#define TCP_KEEPINTVL		5	/* Interval between keepalives */
+#define TCP_KEEPCNT		6	/* Number of keepalives before death */
+#define TCP_SYNCNT		7	/* Number of SYN retransmits */
+#define TCP_LINGER2		8	/* Life time of orphaned FIN-WAIT-2 state */
+#define TCP_DEFER_ACCEPT	9	/* Wake up listener only when data arrive */
+#define TCP_WINDOW_CLAMP	10	/* Bound advertised window */
+#define TCP_INFO		11	/* Information about this connection. */
+#define TCP_QUICKACK		12	/* Block/reenable quick acks */
+#define TCP_CONGESTION		13	/* Congestion control algorithm */
+#define TCP_MD5SIG		14	/* TCP MD5 Signature (RFC2385) */
+#define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/
+#define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */
+#define TCP_USER_TIMEOUT	18	/* How long for loss retry before timeout */
+#define TCP_REPAIR		19	/* TCP sock is under repair right now */
+#define TCP_REPAIR_QUEUE	20
+#define TCP_QUEUE_SEQ		21
+#define TCP_REPAIR_OPTIONS	22
+#define TCP_FASTOPEN		23	/* Enable FastOpen on listeners */
+#define TCP_TIMESTAMP		24
+
+struct tcp_repair_opt {
+	__u32	opt_code;
+	__u32	opt_val;
+};
+
+enum {
+	TCP_NO_QUEUE,
+	TCP_RECV_QUEUE,
+	TCP_SEND_QUEUE,
+	TCP_QUEUES_NR,
+};
+
+/* for TCP_INFO socket option */
+#define TCPI_OPT_TIMESTAMPS	1
+#define TCPI_OPT_SACK		2
+#define TCPI_OPT_WSCALE		4
+#define TCPI_OPT_ECN		8 /* ECN was negociated at TCP session init */
+#define TCPI_OPT_ECN_SEEN	16 /* we received at least one packet with ECT */
+#define TCPI_OPT_SYN_DATA	32 /* SYN-ACK acked data in SYN sent or rcvd */
+
+enum tcp_ca_state {
+	TCP_CA_Open = 0,
+#define TCPF_CA_Open	(1<<TCP_CA_Open)
+	TCP_CA_Disorder = 1,
+#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
+	TCP_CA_CWR = 2,
+#define TCPF_CA_CWR	(1<<TCP_CA_CWR)
+	TCP_CA_Recovery = 3,
+#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
+	TCP_CA_Loss = 4
+#define TCPF_CA_Loss	(1<<TCP_CA_Loss)
+};
+
+struct tcp_info {
+	__u8	tcpi_state;
+	__u8	tcpi_ca_state;
+	__u8	tcpi_retransmits;
+	__u8	tcpi_probes;
+	__u8	tcpi_backoff;
+	__u8	tcpi_options;
+	__u8	tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
+
+	__u32	tcpi_rto;
+	__u32	tcpi_ato;
+	__u32	tcpi_snd_mss;
+	__u32	tcpi_rcv_mss;
+
+	__u32	tcpi_unacked;
+	__u32	tcpi_sacked;
+	__u32	tcpi_lost;
+	__u32	tcpi_retrans;
+	__u32	tcpi_fackets;
+
+	/* Times. */
+	__u32	tcpi_last_data_sent;
+	__u32	tcpi_last_ack_sent;     /* Not remembered, sorry. */
+	__u32	tcpi_last_data_recv;
+	__u32	tcpi_last_ack_recv;
+
+	/* Metrics. */
+	__u32	tcpi_pmtu;
+	__u32	tcpi_rcv_ssthresh;
+	__u32	tcpi_rtt;
+	__u32	tcpi_rttvar;
+	__u32	tcpi_snd_ssthresh;
+	__u32	tcpi_snd_cwnd;
+	__u32	tcpi_advmss;
+	__u32	tcpi_reordering;
+
+	__u32	tcpi_rcv_rtt;
+	__u32	tcpi_rcv_space;
+
+	__u32	tcpi_total_retrans;
+};
+
+/* for TCP_MD5SIG socket option */
+#define TCP_MD5SIG_MAXKEYLEN	80
+
+struct tcp_md5sig {
+	struct __kernel_sockaddr_storage tcpm_addr;	/* address associated */
+	__u16	__tcpm_pad1;				/* zero */
+	__u16	tcpm_keylen;				/* key length */
+	__u32	__tcpm_pad2;				/* zero */
+	__u8	tcpm_key[TCP_MD5SIG_MAXKEYLEN];		/* key (binary) */
+};
+
+#endif /* _LINUX_TCP_H */

misc/ss.c

@@ -32,7 +32,7 @@
 #include "libnetlink.h"
 #include "SNAPSHOT.h"
 
-#include <netinet/tcp.h>
+#include <linux/tcp.h>
 #include <linux/sock_diag.h>
 #include <linux/inet_diag.h>
 #include <linux/unix_diag.h>
@@ -399,32 +399,32 @@ static int get_slabstat(struct slabstat *s)
 
 static const char *sstate_name[] = {
 	"UNKNOWN",
-	[TCP_ESTABLISHED] = "ESTAB",
-	[TCP_SYN_SENT] = "SYN-SENT",
-	[TCP_SYN_RECV] = "SYN-RECV",
-	[TCP_FIN_WAIT1] = "FIN-WAIT-1",
-	[TCP_FIN_WAIT2] = "FIN-WAIT-2",
-	[TCP_TIME_WAIT] = "TIME-WAIT",
-	[TCP_CLOSE] = "UNCONN",
-	[TCP_CLOSE_WAIT] = "CLOSE-WAIT",
-	[TCP_LAST_ACK] = "LAST-ACK",
-	[TCP_LISTEN] = 	"LISTEN",
-	[TCP_CLOSING] = "CLOSING",
+	[SS_ESTABLISHED] = "ESTAB",
+	[SS_SYN_SENT] = "SYN-SENT",
+	[SS_SYN_RECV] = "SYN-RECV",
+	[SS_FIN_WAIT1] = "FIN-WAIT-1",
+	[SS_FIN_WAIT2] = "FIN-WAIT-2",
+	[SS_TIME_WAIT] = "TIME-WAIT",
+	[SS_CLOSE] = "UNCONN",
+	[SS_CLOSE_WAIT] = "CLOSE-WAIT",
+	[SS_LAST_ACK] = "LAST-ACK",
+	[SS_LISTEN] = 	"LISTEN",
+	[SS_CLOSING] = "CLOSING",
 };
 
 static const char *sstate_namel[] = {
 	"UNKNOWN",
-	[TCP_ESTABLISHED] = "established",
-	[TCP_SYN_SENT] = "syn-sent",
-	[TCP_SYN_RECV] = "syn-recv",
-	[TCP_FIN_WAIT1] = "fin-wait-1",
-	[TCP_FIN_WAIT2] = "fin-wait-2",
-	[TCP_TIME_WAIT] = "time-wait",
-	[TCP_CLOSE] = "unconnected",
-	[TCP_CLOSE_WAIT] = "close-wait",
-	[TCP_LAST_ACK] = "last-ack",
-	[TCP_LISTEN] = 	"listening",
-	[TCP_CLOSING] = "closing",
+	[SS_ESTABLISHED] = "established",
+	[SS_SYN_SENT] = "syn-sent",
+	[SS_SYN_RECV] = "syn-recv",
+	[SS_FIN_WAIT1] = "fin-wait-1",
+	[SS_FIN_WAIT2] = "fin-wait-2",
+	[SS_TIME_WAIT] = "time-wait",
+	[SS_CLOSE] = "unconnected",
+	[SS_CLOSE_WAIT] = "close-wait",
+	[SS_LAST_ACK] = "last-ack",
+	[SS_LISTEN] = 	"listening",
+	[SS_CLOSING] = "closing",
 };
 
 struct tcpstat
@@ -1392,6 +1392,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r)
 				printf(" ecn");
 			if (info->tcpi_options & TCPI_OPT_ECN_SEEN)
 				printf(" ecnseen");
+			if (info->tcpi_options & TCPI_OPT_SYN_DATA)
+				printf(" fastopen");
 		}
 
 		if (tb[INET_DIAG_CONG])