net: tcp_probe: also include rcv_wnd next to snd_wnd (b4c1c1d0) · Commits · 戴 / test

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>

net/ipv4/tcp_probe.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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,

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