This is a note to let you know that I've just added the patch titled
ipv6: drop packets with multiple fragmentation headers
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-drop-packets-with-multiple-fragmentation-headers.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 301d2f6834afe6f4049b9193a85b05bbb65ffb6a Mon Sep 17 00:00:00 2001
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 16 Aug 2013 13:30:07 +0200
Subject: ipv6: drop packets with multiple fragmentation headers
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
[ Upstream commit f46078cfcd77fa5165bf849f5e568a7ac5fa569c ]
It is not allowed for an ipv6 packet to contain multiple fragmentation
headers. So discard packets which were already reassembled by
fragmentation logic and send back a parameter problem icmp.
The updates for RFC 6980 will come in later, I have to do a bit more
research here.
Cc: YOSHIFUJI Hideaki <yoshfuji@xxxxxxxxxxxxxx>
Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/ipv6.h | 1 +
net/ipv6/reassembly.c | 5 +++++
2 files changed, 6 insertions(+)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -260,6 +260,7 @@ struct inet6_skb_parm {
#define IP6SKB_XFRM_TRANSFORMED 1
#define IP6SKB_FORWARDED 2
#define IP6SKB_REROUTED 4
+#define IP6SKB_FRAGMENTED 16
};
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -516,6 +516,7 @@ static int ip6_frag_reasm(struct frag_qu
head->tstamp = fq->q.stamp;
ipv6_hdr(head)->payload_len = htons(payload_len);
IP6CB(head)->nhoff = nhoff;
+ IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
/* Yes, and fold redundant checksum back. 8) */
if (head->ip_summed == CHECKSUM_COMPLETE)
@@ -551,6 +552,9 @@ static int ipv6_frag_rcv(struct sk_buff
const struct ipv6hdr *hdr = ipv6_hdr(skb);
struct net *net = dev_net(skb_dst(skb)->dev);
+ if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
+ goto fail_hdr;
+
IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
/* Jumbo payload inhibits frag. header */
@@ -571,6 +575,7 @@ static int ipv6_frag_rcv(struct sk_buff
ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
+ IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
return 1;
}
Patches currently in stable-queue which might be from hannes@xxxxxxxxxxxxxxxxxxx are
queue-3.4/net-bridge-convert-mldv2-query-mrc-into-msecs_to_jiffies-for-max_delay.patch
queue-3.4/ipv6-don-t-stop-backtracking-in-fib6_lookup_1-if-subtree-does-not-match.patch
queue-3.4/ipv6-don-t-depend-on-per-socket-memory-for-neighbour-discovery-messages.patch
queue-3.4/ipv6-remove-max_addresses-check-from-ipv6_create_tempaddr.patch
queue-3.4/icmpv6-treat-dest-unreachable-codes-5-and-6-as-eacces-not-eproto.patch
queue-3.4/ipv6-drop-packets-with-multiple-fragmentation-headers.patch
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