Commit 399d1404 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

inet: frags: get rif of inet_frag_evicting()

This refactors ip_expire() since one indentation level is removed.

Note: in the future, we should try hard to avoid the skb_clone()
since this is a serious performance cost.
Under DDOS, the ICMP message wont be sent because of rate limits.

Fact that ip6_expire_frag_queue() does not use skb_clone() is
disturbing too. Presumably IPv6 should have the same
issue than the one we fixed in commit ec4fbd64
("inet: frag: release spinlock before calling icmp_send()")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6befe4a7
......@@ -119,11 +119,6 @@ static inline void inet_frag_put(struct inet_frag_queue *q)
inet_frag_destroy(q);
}
static inline bool inet_frag_evicting(struct inet_frag_queue *q)
{
return false;
}
/* Memory Tracking Functions. */
static inline int frag_mem_limit(struct netns_frags *nf)
......
......@@ -143,8 +143,11 @@ static bool frag_expire_skip_icmp(u32 user)
static void ip_expire(struct timer_list *t)
{
struct inet_frag_queue *frag = from_timer(frag, t, timer);
struct ipq *qp;
struct sk_buff *clone, *head;
const struct iphdr *iph;
struct net *net;
struct ipq *qp;
int err;
qp = container_of(frag, struct ipq, q);
net = container_of(qp->q.net, struct net, ipv4.frags);
......@@ -158,14 +161,11 @@ static void ip_expire(struct timer_list *t)
ipq_kill(qp);
__IP_INC_STATS(net, IPSTATS_MIB_REASMFAILS);
if (!inet_frag_evicting(&qp->q)) {
struct sk_buff *clone, *head = qp->q.fragments;
const struct iphdr *iph;
int err;
head = qp->q.fragments;
__IP_INC_STATS(net, IPSTATS_MIB_REASMTIMEOUT);
if (!(qp->q.flags & INET_FRAG_FIRST_IN) || !qp->q.fragments)
if (!(qp->q.flags & INET_FRAG_FIRST_IN) || !head)
goto out;
head->dev = dev_get_by_index_rcu(net, qp->iif);
......@@ -197,7 +197,6 @@ static void ip_expire(struct timer_list *t)
consume_skb(clone);
goto out_rcu_unlock;
}
}
out:
spin_unlock(&qp->q.lock);
out_rcu_unlock:
......
......@@ -106,10 +106,6 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq)
goto out_rcu_unlock;
__IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
if (inet_frag_evicting(&fq->q))
goto out_rcu_unlock;
__IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
/* Don't send error if the first segment did not arrive. */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment