diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2024-04-26 16:34:04 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-04-26 16:34:05 +0300 |
| commit | d5115a55ffb5253743346ddf628a890417e2935e (patch) | |
| tree | 3441c70fb71b9bb73af14f90af4c1ece881d4d23 /net/ipv4/tcp_timer.c | |
| parent | 15fd021bc4270273d8f4b7f58fdda8a16214a377 (diff) | |
| parent | b533fb9cf4f7c6ca2aa255a5a1fdcde49fff2b24 (diff) | |
| download | linux-d5115a55ffb5253743346ddf628a890417e2935e.tar.xz | |
Merge branch 'implement-reset-reason-mechanism-to-detect'
Jason Xing says:
====================
Implement reset reason mechanism to detect
From: Jason Xing <kernelxing@tencent.com>
In production, there are so many cases about why the RST skb is sent but
we don't have a very convenient/fast method to detect the exact underlying
reasons.
RST is implemented in two kinds: passive kind (like tcp_v4_send_reset())
and active kind (like tcp_send_active_reset()). The former can be traced
carefully 1) in TCP, with the help of drop reasons, which is based on
Eric's idea[1], 2) in MPTCP, with the help of reset options defined in
RFC 8684. The latter is relatively independent, which should be
implemented on our own, such as active reset reasons which can not be
replace by skb drop reason or something like this.
In this series, I focus on the fundamental implement mostly about how
the rstreason mechanism works and give the detailed passive part as an
example, not including the active reset part. In future, we can go
further and refine those NOT_SPECIFIED reasons.
Here are some examples when tracing:
<idle>-0 [002] ..s1. 1830.262425: tcp_send_reset: skbaddr=x
skaddr=x src=x dest=x state=x reason=NOT_SPECIFIED
<idle>-0 [002] ..s1. 1830.262425: tcp_send_reset: skbaddr=x
skaddr=x src=x dest=x state=x reason=NO_SOCKET
[1]
Link: https://lore.kernel.org/all/CANn89iJw8x-LqgsWOeJQQvgVg6DnL5aBRLi10QN2WBdr+X4k=w@mail.gmail.com/
====================
Link: https://lore.kernel.org/r/20240425031340.46946-1-kerneljasonxing@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv4/tcp_timer.c')
| -rw-r--r-- | net/ipv4/tcp_timer.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index 976db57b95d4..83fe7f62f7f1 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -22,6 +22,7 @@ #include <linux/module.h> #include <linux/gfp.h> #include <net/tcp.h> +#include <net/rstreason.h> static u32 tcp_clamp_rto_to_user_timeout(const struct sock *sk) { @@ -127,7 +128,8 @@ static int tcp_out_of_resources(struct sock *sk, bool do_reset) (!tp->snd_wnd && !tp->packets_out)) do_reset = true; if (do_reset) - tcp_send_active_reset(sk, GFP_ATOMIC); + tcp_send_active_reset(sk, GFP_ATOMIC, + SK_RST_REASON_NOT_SPECIFIED); tcp_done(sk); __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONMEMORY); return 1; @@ -768,7 +770,7 @@ static void tcp_keepalive_timer (struct timer_list *t) goto out; } } - tcp_send_active_reset(sk, GFP_ATOMIC); + tcp_send_active_reset(sk, GFP_ATOMIC, SK_RST_REASON_NOT_SPECIFIED); goto death; } @@ -795,7 +797,8 @@ static void tcp_keepalive_timer (struct timer_list *t) icsk->icsk_probes_out > 0) || (user_timeout == 0 && icsk->icsk_probes_out >= keepalive_probes(tp))) { - tcp_send_active_reset(sk, GFP_ATOMIC); + tcp_send_active_reset(sk, GFP_ATOMIC, + SK_RST_REASON_NOT_SPECIFIED); tcp_write_err(sk); goto out; } |