[PATCH iproute2] ss: add support for delivered and delivered_ce fields

[Eric Dumazet <edumazet@google.com>]

Kernel support was added in linux-4.18 in commit feb5f2ec6464
("tcp: export packets delivery info")

Tested:

ss -ti
...
ESTAB   0 2270520      [2607:f8b0:8099:e16::]:47646   [2607:f8b0:8099:e18::]:38953
	 ts sack cubic wscale:8,8 rto:7 rtt:2.824/0.278 mss:1428
     pmtu:1500 rcvmss:536 advmss:1428 cwnd:89 ssthresh:62 bytes_acked:2097871945
    segs_out:1469144 segs_in:65221 data_segs_out:1469142 send 360.0Mbps lastsnd:2
    lastrcv:99231 lastack:2 pacing_rate 431.9Mbps delivery_rate 246.4Mbps
(*) delivered:1469099 delivered_ce:424799
    busy:99231ms unacked:44 rcv_space:14280 rcv_ssthresh:65535
    notsent:2207688 minrtt:0.228

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 misc/ss.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/misc/ss.c b/misc/ss.c
index e4d6ae489e798419fa6ce6fb0f4b8b0b3232adf6..3aa94f235085512510dca9fd597e8e37aaaf0fd3 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -817,6 +817,8 @@ struct tcpstat {
 	unsigned int	    fackets;
 	unsigned int	    reordering;
 	unsigned int	    not_sent;
+	unsigned int	    delivered;
+	unsigned int	    delivered_ce;
 	double		    rcv_rtt;
 	double		    min_rtt;
 	int		    rcv_space;
@@ -2483,6 +2485,10 @@ static void tcp_stats_print(struct tcpstat *s)
 
 	if (s->delivery_rate)
 		out(" delivery_rate %sbps", sprint_bw(b1, s->delivery_rate));
+	if (s->delivered)
+		out(" delivered:%u", s->delivered);
+	if (s->delivered_ce)
+		out(" delivered_ce:%u", s->delivered_ce);
 	if (s->app_limited)
 		out(" app_limited");
 
@@ -2829,6 +2835,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 		s.busy_time = info->tcpi_busy_time;
 		s.rwnd_limited = info->tcpi_rwnd_limited;
 		s.sndbuf_limited = info->tcpi_sndbuf_limited;
+		s.delivered = info->tcpi_delivered;
+		s.delivered_ce = info->tcpi_delivered_ce;
 		tcp_stats_print(&s);
 		free(s.dctcp);
 		free(s.bbr_info);
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog