[net-next] netlink: Use random autobind rover
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2015-05-17 02:45:44
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
On Sat, May 16, 2015 at 05:08:19PM -0400, David Miller wrote:
As far as I can tell, this ought to be fine as-is.
OK what about dropping the global rover altogether? Let's just start randomly like UDP. ---8<--- Currently we use a global rover to select a port ID that is unique. This used to work consistently when it was protected with a global lock. However as we're now lockless, the global rover can exhibit pathological behaviour should multiple threads all stomp on it at the same time. Granted this will eventually resolve itself but the process is suboptimal. This patch replaces the global rover with a pseudorandom starting point to avoid this issue. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index ec4adbd..716c6d2 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c@@ -1296,20 +1296,24 @@ static int netlink_autobind(struct socket *sock) struct netlink_table *table = &nl_table[sk->sk_protocol]; s32 portid = task_tgid_vnr(current); int err; - static s32 rover = -4097; + s32 rover = -4096; + bool ok; retry: cond_resched(); rcu_read_lock(); - if (__netlink_lookup(table, portid, net)) { + ok = !__netlink_lookup(table, portid, net); + rcu_read_unlock(); + if (!ok) { /* Bind collision, search negative portid values. */ - portid = rover--; - if (rover > -4097) + if (rover == -4096) + /* rover will be in range [S32_MIN, -4097] */ + rover = S32_MIN + prandom_u32_max(-4096 - S32_MIN); + else if (rover >= -4096) rover = -4097; - rcu_read_unlock(); + portid = rover--; goto retry; } - rcu_read_unlock(); err = netlink_insert(sk, portid); if (err == -EADDRINUSE)
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt