path: root/net/ipv4/xfrm4_mode_beet.c
diff options
authorHerbert Xu <herbert@gondor.apana.org.au>2008-03-26 16:51:09 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-26 16:51:09 -0700
commit732c8bd590625e8bc0b88313b82930e336b2bec4 (patch)
tree1cf3f6b9db7b886d35bbf38bab2ca6ff82d206d8 /net/ipv4/xfrm4_mode_beet.c
parentMerge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 (diff)
[IPSEC]: Fix BEET output
The IPv6 BEET output function is incorrectly including the inner header in the payload to be protected. This causes a crash as the packet doesn't actually have that many bytes for a second header. The IPv4 BEET output on the other hand is broken when it comes to handling an inner IPv6 header since it always assumes an inner IPv4 header. This patch fixes both by making sure that neither BEET output function touches the inner header at all. All access is now done through the protocol-independent cb structure. Two new attributes are added to make this work, the IP header length and the IPv4 option length. They're filled in by the inner mode's output function. Thanks to Joakim Koskela for finding this problem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_mode_beet.c')
1 files changed, 5 insertions, 6 deletions
diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index b47030ba162b..9c798abce736 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -39,13 +39,11 @@ static void xfrm4_beet_make_header(struct sk_buff *skb)
static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
struct ip_beet_phdr *ph;
- struct iphdr *iph, *top_iph;
+ struct iphdr *top_iph;
int hdrlen, optlen;
- iph = ip_hdr(skb);
hdrlen = 0;
- optlen = iph->ihl * 4 - sizeof(*iph);
+ optlen = XFRM_MODE_SKB_CB(skb)->optlen;
if (unlikely(optlen))
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
@@ -53,11 +51,12 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
skb->mac_header = skb->network_header +
offsetof(struct iphdr, protocol);
- skb->transport_header = skb->network_header + sizeof(*iph);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
- ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
+ ph = (struct ip_beet_phdr *)
+ __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
top_iph = ip_hdr(skb);