diff options
| author |   Eric Dumazet <edumazet@google.com> | 2018-03-31 12:58:55 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-03-31 23:25:39 -0400 |
| commit | 05c0b86b9696802fd0ce5676a92a63f1b455bdf3 (patch) | |
| tree | fd13fe02679973cf774f54ac96f155dc82905baa | |
| parent | inet: frags: do not clone skb in ip_expire() (diff) | |
| download | linux-dev-05c0b86b9696802fd0ce5676a92a63f1b455bdf3.tar.xz linux-dev-05c0b86b9696802fd0ce5676a92a63f1b455bdf3.zip | |
ipv6: frags: rewrite ip6_expire_frag_queue()
Make it similar to IPv4 ip_expire(), and release the lock
before calling icmp functions.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/reassembly.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index 905a8aee2671..2127da130dc2 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -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(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); __IP6_INC_STATS(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); |