From: Eric Dumazet Date: Mon, 3 Oct 2011 18:01:21 +0000 (-0400) Subject: tcp: report ECN_SEEN in tcp_info X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b5c5693bb723a019deac3cd1345f3e7233c8a67e;p=openwrt%2Fstaging%2Fblogic.git tcp: report ECN_SEEN in tcp_info Allows ss command (iproute2) to display "ecnseen" if at least one packet with ECT(0) or ECT(1) or ECN was received by this socket. "ecn" means ECN was negotiated at session establishment (TCP level) "ecnseen" means we received at least one packet with ECT fields set (IP level) ss -i ... ESTAB 0 0 192.168.20.110:22 192.168.20.144:38016 ino:5950 sk:f178e400 mem:(r0,w0,f0,t0) ts sack ecn ecnseen bic wscale:7,8 rto:210 rtt:12.5/7.5 cwnd:10 send 9.3Mbps rcv_space:14480 Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 6b63b310af36..7f59ee946983 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -111,7 +111,8 @@ enum { #define TCPI_OPT_TIMESTAMPS 1 #define TCPI_OPT_SACK 2 #define TCPI_OPT_WSCALE 4 -#define TCPI_OPT_ECN 8 +#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 */ enum tcp_ca_state { TCP_CA_Open = 0, diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 131c45f93373..4c0da24fb649 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2455,8 +2455,10 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info) info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; } - if (tp->ecn_flags&TCP_ECN_OK) + if (tp->ecn_flags & TCP_ECN_OK) info->tcpi_options |= TCPI_OPT_ECN; + if (tp->ecn_flags & TCP_ECN_SEEN) + info->tcpi_options |= TCPI_OPT_ECN_SEEN; info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato);