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author | Paolo Abeni <pabeni@redhat.com> | 2018-06-08 11:35:40 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2018-06-08 19:55:15 -0400 |
commit | 6c206b20092a3623184cff9470dba75d21507874 (patch) | |
tree | acc594ed296987e67d25703d1317772239dd3132 | |
parent | 49c2c3f246e2fc3009039e31a826333dcd0283cd (diff) | |
download | linux-6c206b20092a3623184cff9470dba75d21507874.tar.gz linux-6c206b20092a3623184cff9470dba75d21507874.tar.bz2 linux-6c206b20092a3623184cff9470dba75d21507874.zip |
udp: fix rx queue len reported by diag and proc interface
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>
-rw-r--r-- | include/net/transp_v6.h | 11 | ||||
-rw-r--r-- | include/net/udp.h | 5 | ||||
-rw-r--r-- | net/ipv4/udp.c | 2 | ||||
-rw-r--r-- | net/ipv4/udp_diag.c | 2 | ||||
-rw-r--r-- | net/ipv6/datagram.c | 6 | ||||
-rw-r--r-- | net/ipv6/udp.c | 3 |
6 files changed, 21 insertions, 8 deletions
diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h index c4f5caaf3778..f6a3543e5247 100644 --- a/include/net/transp_v6.h +++ b/include/net/transp_v6.h @@ -45,8 +45,15 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk, struct msghdr *msg, struct flowi6 *fl6, struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc); -void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, - __u16 srcp, __u16 destp, int bucket); +void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, + __u16 srcp, __u16 destp, int rqueue, int bucket); +static inline void +ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, __u16 srcp, + __u16 destp, int bucket) +{ + __ip6_dgram_sock_seq_show(seq, sp, srcp, destp, sk_rmem_alloc_get(sp), + bucket); +} #define LOOPBACK4_IPV6 cpu_to_be32(0x7f000006) diff --git a/include/net/udp.h b/include/net/udp.h index 7ba0ed252c52..b1ea8b0f5e6a 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -247,6 +247,11 @@ 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); diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 3365362cac88..9bb27df4dac5 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2772,7 +2772,7 @@ static void udp4_format_sock(struct sock *sp, struct seq_file *f, " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", bucket, src, srcp, dest, destp, sp->sk_state, sk_wmem_alloc_get(sp), - sk_rmem_alloc_get(sp), + udp_rqueue_get(sp), 0, 0L, 0, from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), 0, sock_i_ino(sp), diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c index d0390d844ac8..d9ad986c7b2c 100644 --- a/net/ipv4/udp_diag.c +++ b/net/ipv4/udp_diag.c @@ -163,7 +163,7 @@ static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, void *info) { - r->idiag_rqueue = sk_rmem_alloc_get(sk); + r->idiag_rqueue = udp_rqueue_get(sk); r->idiag_wqueue = sk_wmem_alloc_get(sk); } diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index a02ad100f0d7..2ee08b6a86a4 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -1019,8 +1019,8 @@ exit_f: } EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); -void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, - __u16 srcp, __u16 destp, int bucket) +void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, + __u16 srcp, __u16 destp, int rqueue, int bucket) { const struct in6_addr *dest, *src; @@ -1036,7 +1036,7 @@ void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, dest->s6_addr32[2], dest->s6_addr32[3], destp, sp->sk_state, sk_wmem_alloc_get(sp), - sk_rmem_alloc_get(sp), + rqueue, 0, 0L, 0, from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 0, diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 164afd31aebf..e6645cae403e 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1523,7 +1523,8 @@ int udp6_seq_show(struct seq_file *seq, void *v) struct inet_sock *inet = inet_sk(v); __u16 srcp = ntohs(inet->inet_sport); __u16 destp = ntohs(inet->inet_dport); - ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); + __ip6_dgram_sock_seq_show(seq, v, srcp, destp, + udp_rqueue_get(v), bucket); } return 0; } |