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| author | Neal Cardwell <ncardwell@google.com> | 2014-01-10 15:34:45 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-13 22:35:46 -0800 |
| commit | 70315d22d3c7383f9a508d0aab21e2eb35b2303a (patch) | |
| tree | 434e5ce293a26e477458c771be03d194551b88da | |
| parent | 9ef9730ba84d4021a27d3a1679fd50f9bac0e0e7 (diff) | |
| download | lwn-70315d22d3c7383f9a508d0aab21e2eb35b2303a.tar.gz lwn-70315d22d3c7383f9a508d0aab21e2eb35b2303a.zip | |
inet_diag: fix inet_diag_dump_icsk() to use correct state for timewait sockets
Fix inet_diag_dump_icsk() to reflect the fact that both TCP_TIME_WAIT
and TCP_FIN_WAIT2 connections are represented by inet_timewait_sock
(not just TIME_WAIT), and for such sockets the tw_substate field holds
the real state, which can be either TCP_TIME_WAIT or TCP_FIN_WAIT2.
This brings the inet_diag state-matching code in line with the field
it uses to populate idiag_state. This is also analogous to the info
exported in /proc/net/tcp, where get_tcp4_sock() exports sk->sk_state
and get_timewait4_sock() exports tw->tw_substate.
Before fixing this, (a) neither "ss -nemoi" nor "ss -nemoi state
fin-wait-2" would return a socket in TCP_FIN_WAIT2; and (b) "ss -nemoi
state time-wait" would also return sockets in state TCP_FIN_WAIT2.
This is an old bug that predates 05dbc7b ("tcp/dccp: remove twchain").
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/inet_diag.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index a0f52dac8940..e34dccbc4d70 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -930,12 +930,15 @@ skip_listen_ht: spin_lock_bh(lock); sk_nulls_for_each(sk, node, &head->chain) { int res; + int state; if (!net_eq(sock_net(sk), net)) continue; if (num < s_num) goto next_normal; - if (!(r->idiag_states & (1 << sk->sk_state))) + state = (sk->sk_state == TCP_TIME_WAIT) ? + inet_twsk(sk)->tw_substate : sk->sk_state; + if (!(r->idiag_states & (1 << state))) goto next_normal; if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) |