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net: tcp_probe: also include rcv_wnd next to snd_wnd 

It is helpful to sometimes know the TCP window sizes of an established
socket e.g. to confirm that window scaling is working or to tweak the
window size to improve high-latency connections, etc etc. Currently the
TCP snooper only exports the send window size, but not the receive window
size. Therefore, also add the receive window size to the end of the
output line.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-08-21 19:47:58 +02:00 committed by David S. Miller
parent baf3b3f227
commit b4c1c1d038
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_probe.c
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@ -60,6 +60,7 @@ struct tcp_log {
u32 snd_nxt;
u32 snd_una;
u32 snd_wnd;
u32 rcv_wnd;
u32 snd_cwnd;
u32 ssthresh;
u32 srtt;
@ -116,6 +117,7 @@ static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
p->snd_una = tp->snd_una;
p->snd_cwnd = tp->snd_cwnd;
p->snd_wnd = tp->snd_wnd;
p->rcv_wnd = tp->rcv_wnd;
p->ssthresh = tcp_current_ssthresh(sk);
p->srtt = tp->srtt >> 3;
@ -157,13 +159,13 @@ static int tcpprobe_sprint(char *tbuf, int n)
= ktime_to_timespec(ktime_sub(p->tstamp, tcp_probe.start));
return scnprintf(tbuf, n,
"%lu.%09lu %pI4:%u %pI4:%u %d %#x %#x %u %u %u %u\n",
"%lu.%09lu %pI4:%u %pI4:%u %d %#x %#x %u %u %u %u %u\n",
(unsigned long) tv.tv_sec,
(unsigned long) tv.tv_nsec,
&p->saddr, ntohs(p->sport),
&p->daddr, ntohs(p->dport),
p->length, p->snd_nxt, p->snd_una,
p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt);
p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt, p->rcv_wnd);
}
static ssize_t tcpprobe_read(struct file *file, char __user *buf,