+/* Return information about state of tcp endpoint in API format. */
+void tcp_get_info(struct sock *sk, struct tcp_info *info)
+{
+ struct tcp_opt *tp = tcp_sk(sk);
+ u32 now = tcp_time_stamp;
+
+ memset(info, 0, sizeof(*info));
+
+ info->tcpi_state = sk->sk_state;
+ info->tcpi_ca_state = tp->ca_state;
+ info->tcpi_retransmits = tp->retransmits;
+ info->tcpi_probes = tp->probes_out;
+ info->tcpi_backoff = tp->backoff;
+
+ if (tp->tstamp_ok)
+ info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
+ if (tp->sack_ok)
+ info->tcpi_options |= TCPI_OPT_SACK;
+ if (tp->wscale_ok) {
+ info->tcpi_options |= TCPI_OPT_WSCALE;
+ info->tcpi_snd_wscale = tp->snd_wscale;
+ info->tcpi_rcv_wscale = tp->rcv_wscale;
+ }
+
+ if (tp->ecn_flags&TCP_ECN_OK)
+ info->tcpi_options |= TCPI_OPT_ECN;
+
+ info->tcpi_rto = (1000000*tp->rto)/HZ;
+ info->tcpi_ato = (1000000*tp->ack.ato)/HZ;
+ info->tcpi_snd_mss = tp->mss_cache;
+ info->tcpi_rcv_mss = tp->ack.rcv_mss;
+
+ info->tcpi_unacked = tp->packets_out;
+ info->tcpi_sacked = tp->sacked_out;
+ info->tcpi_lost = tp->lost_out;
+ info->tcpi_retrans = tp->retrans_out;
+ info->tcpi_fackets = tp->fackets_out;
+
+ info->tcpi_last_data_sent = ((now - tp->lsndtime)*1000)/HZ;
+ info->tcpi_last_data_recv = ((now - tp->ack.lrcvtime)*1000)/HZ;
+ info->tcpi_last_ack_recv = ((now - tp->rcv_tstamp)*1000)/HZ;
+
+ info->tcpi_pmtu = tp->pmtu_cookie;
+ info->tcpi_rcv_ssthresh = tp->rcv_ssthresh;
+ info->tcpi_rtt = ((1000000*tp->srtt)/HZ)>>3;
+ info->tcpi_rttvar = ((1000000*tp->mdev)/HZ)>>2;
+ info->tcpi_snd_ssthresh = tp->snd_ssthresh;
+ info->tcpi_snd_cwnd = tp->snd_cwnd;
+ info->tcpi_advmss = tp->advmss;
+ info->tcpi_reordering = tp->reordering;
+
+ info->tcpi_rcv_rtt = ((1000000*tp->rcv_rtt_est.rtt)/HZ)>>3;
+ info->tcpi_rcv_space = tp->rcvq_space.space;
+}
+