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| author | Alex Copot <alex.mihai.c@gmail.com> | 2012-04-12 22:21:45 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-14 15:28:55 -0400 |
| commit | aacd9289af8b82f5fb01bcdd53d0e3406d1333c7 (patch) | |
| tree | d918d09ce942b52f707676e0a648e5c6a84de1b4 /net/ipv4/inet_connection_sock.c | |
| parent | c72e118334a2590f4f07d9e51490b902c33f5280 (diff) | |
| download | linux-aacd9289af8b82f5fb01bcdd53d0e3406d1333c7.tar.bz2 | |
tcp: bind() use stronger condition for bind_conflict
We must try harder to get unique (addr, port) pairs when
doing port autoselection for sockets with SO_REUSEADDR
option set.
We achieve this by adding a relaxation parameter to
inet_csk_bind_conflict. When 'relax' parameter is off
we return a conflict whenever the current searched
pair (addr, port) is not unique.
This tries to address the problems reported in patch:
8d238b25b1ec22a73b1c2206f111df2faaff8285
Revert "tcp: bind() fix when many ports are bound"
Tests where ran for creating and binding(0) many sockets
on 100 IPs. The results are, on average:
* 60000 sockets, 600 ports / IP:
* 0.210 s, 620 (IP, port) duplicates without patch
* 0.219 s, no duplicates with patch
* 100000 sockets, 1000 ports / IP:
* 0.371 s, 1720 duplicates without patch
* 0.373 s, no duplicates with patch
* 200000 sockets, 2000 ports / IP:
* 0.766 s, 6900 duplicates without patch
* 0.768 s, no duplicates with patch
* 500000 sockets, 5000 ports / IP:
* 2.227 s, 41500 duplicates without patch
* 2.284 s, no duplicates with patch
Signed-off-by: Alex Copot <alex.mihai.c@gmail.com>
Signed-off-by: Daniel Baluta <dbaluta@ixiacom.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_connection_sock.c')
| -rw-r--r-- | net/ipv4/inet_connection_sock.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index d19f32aca6ca..14409f111bc2 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -53,7 +53,7 @@ void inet_get_local_port_range(int *low, int *high) EXPORT_SYMBOL(inet_get_local_port_range); int inet_csk_bind_conflict(const struct sock *sk, - const struct inet_bind_bucket *tb) + const struct inet_bind_bucket *tb, bool relax) { struct sock *sk2; struct hlist_node *node; @@ -79,6 +79,14 @@ int inet_csk_bind_conflict(const struct sock *sk, sk2_rcv_saddr == sk_rcv_saddr(sk)) break; } + if (!relax && reuse && sk2->sk_reuse && + sk2->sk_state != TCP_LISTEN) { + const __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); + + if (!sk2_rcv_saddr || !sk_rcv_saddr(sk) || + sk2_rcv_saddr == sk_rcv_saddr(sk)) + break; + } } } return node != NULL; @@ -122,12 +130,13 @@ again: (tb->num_owners < smallest_size || smallest_size == -1)) { smallest_size = tb->num_owners; smallest_rover = rover; - if (atomic_read(&hashinfo->bsockets) > (high - low) + 1) { + if (atomic_read(&hashinfo->bsockets) > (high - low) + 1 && + !inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false)) { snum = smallest_rover; goto tb_found; } } - if (!inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb)) { + if (!inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false)) { snum = rover; goto tb_found; } @@ -178,12 +187,13 @@ tb_found: goto success; } else { ret = 1; - if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb)) { + if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) { if (sk->sk_reuse && sk->sk_state != TCP_LISTEN && smallest_size != -1 && --attempts >= 0) { spin_unlock(&head->lock); goto again; } + goto fail_unlock; } } |