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[TCP/DCCP]: Randomize port selection

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This patch randomizes the port selected on bind() for connections
to help with possible security attacks. It should also be faster
in most cases because there is no need for a global lock.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Stephen Hemminger 2005-11-03 16:33:23 -08:00 • committed by Arnaldo Carvalho de Melo
parent 6151b31c96
commit 6df716340d
6 changed files with 10 additions and 56 deletions
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2
net/ipv4/tcp_ipv4.c
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@ -93,8 +93,6 @@ struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
.lhash_lock = RW_LOCK_UNLOCKED,
.lhash_users = ATOMIC_INIT(0),
.lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait),
.portalloc_lock = SPIN_LOCK_UNLOCKED,
.port_rover = 1024 - 1,
};
static int tcp_v4_get_port(struct sock *sk, unsigned short snum)