diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2018-06-08 11:35:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-26 08:06:28 +0800 |
| commit | 2e5d3168821d2ae523ebab5dd5df6a38f728b0d7 (patch) | |
| tree | 0d384d2363071bc1c6211148e503fdcac44f1e9f /include/net/udp.h | |
| parent | 91717ffc9057f38a0203a40ef36ae2e482fd7cbe (diff) | |
udp: fix rx queue len reported by diag and proc interface
[ Upstream commit 6c206b20092a3623184cff9470dba75d21507874 ]
After commit 6b229cf77d68 ("udp: add batching to udp_rmem_release()")
the sk_rmem_alloc field does not measure exactly anymore the
receive queue length, because we batch the rmem release. The issue
is really apparent only after commit 0d4a6608f68c ("udp: do rmem bulk
free even if the rx sk queue is empty"): the user space can easily
check for an empty socket with not-0 queue length reported by the 'ss'
tool or the procfs interface.
We need to use a custom UDP helper to report the correct queue length,
taking into account the forward allocation deficit.
Reported-by: trevor.francis@46labs.com
Fixes: 6b229cf77d68 ("UDP: add batching to udp_rmem_release()")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/udp.h')
| -rw-r--r-- | include/net/udp.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index 6c759c8594e2..18391015233e 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -244,6 +244,11 @@ static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb, return htons((((u64) hash * (max - min)) >> 32) + min); } +static inline int udp_rqueue_get(struct sock *sk) +{ + return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit); +} + /* net/ipv4/udp.c */ void udp_destruct_sock(struct sock *sk); void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len); |