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ipv6: drop packets with multiple fragmentation headers

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[ Upstream commit f46078cfcd ]

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@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hannes Frederic Sowa 2013-08-16 13:30:07 +02:00 committed by Greg Kroah-Hartman
parent f4cb837d1b
commit 055c396300
2 changed files with 6 additions and 0 deletions
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1
include/linux/ipv6.h
View file

@ -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))

5
net/ipv6/reassembly.c
View file

@ -516,6 +516,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
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 *skb)
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 *skb)
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;
}