inet: frags: use INET_FRAG_EVICTED to prevent icmp messages

Now that we have INET_FRAG_EVICTED we might as well use it to stop
sending icmp messages in the "frag_expire" functions instead of
stripping INET_FRAG_FIRST_IN from their flags when evicting.
Also fix the comment style in ip6_expire_frag_queue().

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index fa49916..4baa76c 100644 (file)
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -151,8 +151,6 @@ evict_again:
                        goto evict_again;
                }
 
-               /* suppress xmit of (icmp) error packet */
-               fq->flags &= ~INET_FRAG_FIRST_IN;
                fq->flags |= INET_FRAG_EVICTED;
                hlist_del(&fq->list);
                hlist_add_head(&fq->list, &expired);

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 6fce1ec..cb56bcc 100644 (file)
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -189,16 +189,18 @@ static void ip_expire(unsigned long arg)
                goto out;
 
        ipq_kill(qp);
-
-       if (!(qp->q.flags & INET_FRAG_EVICTED))
-               IP_INC_STATS_BH(net, IPSTATS_MIB_REASMTIMEOUT);
        IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
 
-       if ((qp->q.flags & INET_FRAG_FIRST_IN) && qp->q.fragments != NULL) {
+       if (!(qp->q.flags & INET_FRAG_EVICTED)) {
                struct sk_buff *head = qp->q.fragments;
                const struct iphdr *iph;
                int err;
 
+               IP_INC_STATS_BH(net, IPSTATS_MIB_REASMTIMEOUT);
+
+               if (!(qp->q.flags & INET_FRAG_FIRST_IN) || !qp->q.fragments)
+                       goto out;
+
                rcu_read_lock();
                head->dev = dev_get_by_index_rcu(net, qp->iif);
                if (!head->dev)
@@ -211,8 +213,7 @@ static void ip_expire(unsigned long arg)
                if (err)
                        goto out_rcu_unlock;
 
-               /*
-                * Only an end host needs to send an ICMP
+               /* Only an end host needs to send an ICMP
                 * "Fragment Reassembly Timeout" message, per RFC792.
                 */
                if (qp->user == IP_DEFRAG_AF_PACKET ||
@@ -221,7 +222,6 @@ static void ip_expire(unsigned long arg)
                     (skb_rtable(head)->rt_type != RTN_LOCAL)))
                        goto out_rcu_unlock;
 
-
                /* Send an ICMP "Fragment Reassembly Timeout" message. */
                icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
 out_rcu_unlock:

diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index b4bacee..beb6872 100644 (file)
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -141,19 +141,20 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
        if (!dev)
                goto out_rcu_unlock;
 
-       if (!(fq->q.flags & INET_FRAG_EVICTED))
-               IP6_INC_STATS_BH(net, __in6_dev_get(dev),
-                                IPSTATS_MIB_REASMTIMEOUT);
        IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
 
+       if (fq->q.flags & INET_FRAG_EVICTED)
+               goto out_rcu_unlock;
+
+       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;
 
-       /*
-          But use as source device on which LAST ARRIVED
-          segment was received. And do not use fq->dev
-          pointer directly, device might already disappeared.
+       /* 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);