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authorShan Wei <shanwei@cn.fujitsu.com>2010-01-23 01:57:42 -0800
committerDavid S. Miller <davem@davemloft.net>2010-01-23 01:57:42 -0800
commite9017b55189355e9e6569990a18919e83f35bccb (patch)
treeb63551b0f5a60af76041f9c9dd0d95bdfef5580a
parente754834e65220b2b674c55c3b6dfb2fb1a2804d0 (diff)
IP: Send an ICMP "Fragment Reassembly Timeout" message when enabling connection track
No matter whether connection track is enabled, an end host should send an ICMPv4 "Fragment Reassembly Timeout" message when defrag timeout. The reasons are following two points: 1. RFC 792 says: >>>> >> > > If a host reassembling a fragmented datagram cannot complete the >>>> >> > > reassembly due to missing fragments within its time limit it >>>> >> > > discards the datagram, and it may send a time exceeded message. >>>> >> > > >>>> >> > > If fragment zero is not available then no time exceeded need be >>>> >> > > sent at all. >>>> >> > > >>>> >> > > Read more: http://www.faqs.org/rfcs/rfc792.html#ixzz0aOXRD7Wp 2. Patrick McHardy also agrees with this opinion. :-) About the discussion of this opinion, refer to http://patchwork.ozlabs.org/patch/41649 The patch fixed the problem like this: When enabling connection track, fragments are received at PRE_ROUTING HOOK. If they are failed to reassemble, ip_expire() will be called. Before sending an ICMP "Fragment Reassembly Timeout" message, the patch searches router table to get the destination entry only for host type. The patch has been tested on both host type and route type. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ip_fragment.c34
1 files changed, 30 insertions, 4 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 891c72aea520..9f41bd311754 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -32,6 +32,8 @@
#include <linux/netdevice.h>
#include <linux/jhash.h>
#include <linux/random.h>
+#include <net/route.h>
+#include <net/dst.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
@@ -205,13 +207,37 @@ static void ip_expire(unsigned long arg)
if ((qp->q.last_in & INET_FRAG_FIRST_IN) && qp->q.fragments != NULL) {
struct sk_buff *head = qp->q.fragments;
- /* Send an ICMP "Fragment Reassembly Timeout" message. */
rcu_read_lock();
head->dev = dev_get_by_index_rcu(net, qp->iif);
- if (head->dev)
- icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
- rcu_read_unlock();
+ if (!head->dev)
+ goto out_rcu_unlock;
+
+ /*
+ * Only search router table for the head fragment,
+ * when defraging timeout at PRE_ROUTING HOOK.
+ */
+ if (qp->user == IP_DEFRAG_CONNTRACK_IN && !skb_dst(head)) {
+ const struct iphdr *iph = ip_hdr(head);
+ int err = ip_route_input(head, iph->daddr, iph->saddr,
+ iph->tos, head->dev);
+ if (unlikely(err))
+ goto out_rcu_unlock;
+
+ /*
+ * Only an end host needs to send an ICMP
+ * "Fragment Reassembly Timeout" message, per RFC792.
+ */
+ if (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:
+ rcu_read_unlock();
out:
spin_unlock(&qp->q.lock);
ipq_put(qp);