Commit bf818734 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman

ipv6: frags: rewrite ip6_expire_frag_queue()

commit 05c0b86b9696802fd0ce5676a92a63f1b455bdf3 upstream.

Make it similar to IPv4 ip_expire(), and release the lock
before calling icmp functions.
Signed-off-by: 's avatarEric Dumazet <edumazet@google.com>
Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: 's avatarBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f925a296
......@@ -92,7 +92,9 @@ EXPORT_SYMBOL(ip6_frag_init);
void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq)
{
struct net_device *dev = NULL;
struct sk_buff *head;
rcu_read_lock();
spin_lock(&fq->q.lock);
if (fq->q.flags & INET_FRAG_COMPLETE)
......@@ -100,28 +102,34 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq)
inet_frag_kill(&fq->q);
rcu_read_lock();
dev = dev_get_by_index_rcu(net, fq->iif);
if (!dev)
goto out_rcu_unlock;
goto out;
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
/* Don't send error if the first segment did not arrive. */
if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments)
goto out_rcu_unlock;
head = fq->q.fragments;
if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !head)
goto out;
/* But use as source device on which LAST ARRIVED
* segment was received. And do not use fq->dev
* pointer directly, device might already disappeared.
*/
fq->q.fragments->dev = dev;
icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
out_rcu_unlock:
rcu_read_unlock();
head->dev = dev;
skb_get(head);
spin_unlock(&fq->q.lock);
icmpv6_send(head, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
kfree_skb(head);
goto out_rcu_unlock;
out:
spin_unlock(&fq->q.lock);
out_rcu_unlock:
rcu_read_unlock();
inet_frag_put(&fq->q);
}
EXPORT_SYMBOL(ip6_expire_frag_queue);
......
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