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tcp_metrics: Rewrite tcp_metrics_flush_all

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Rewrite tcp_metrics_flush_all so that it can cope with entries from
different network namespaces on it's hash chain.

This is based on the logic in tcp_metrics_nl_cmd_del for deleting
a selection of entries from a tcp metrics hash chain.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2015-03-13 00:07:10 -05:00 committed by David S. Miller
parent 8a4bff714f
commit 04f721c671
1 changed files with 11 additions and 10 deletions
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21
net/ipv4/tcp_metrics.c
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@ -1051,18 +1051,19 @@ static void tcp_metrics_flush_all(struct net *net)
unsigned int row;
for (row = 0; row < max_rows; row++, hb++) {
struct tcp_metrics_block __rcu **pp;
spin_lock_bh(&tcp_metrics_lock);
tm = deref_locked_genl(hb->chain);
if (tm)
hb->chain = NULL;
spin_unlock_bh(&tcp_metrics_lock);
while (tm) {
struct tcp_metrics_block *next;
next = deref_genl(tm->tcpm_next);
kfree_rcu(tm, rcu_head);
tm = next;
pp = &hb->chain;
for (tm = deref_locked_genl(*pp); tm;
tm = deref_locked_genl(*pp)) {
if (net_eq(tm_net(tm), net)) {
*pp = tm->tcpm_next;
kfree_rcu(tm, rcu_head);
} else {
pp = &tm->tcpm_next;
}
}
spin_unlock_bh(&tcp_metrics_lock);
}
}