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authorPatrick McHardy <kaber@trash.net>2007-04-09 11:47:58 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:28:39 -0700
commitac758e3c55c529714354fc268892ca4d23ca1e99 (patch)
tree05d287a417c04114afa68c2a931f3c212e133e1c /net/ipv4/xfrm4_mode_beet.c
parent[XFRM]: Optimize MTU calculation (diff)
downloadlinux-dev-ac758e3c55c529714354fc268892ca4d23ca1e99.tar.xz
linux-dev-ac758e3c55c529714354fc268892ca4d23ca1e99.zip
[XFRM]: beet: fix worst case header_len calculation
esp_init_state doesn't account for the beet pseudo header in the header_len calculation, which may result in undersized skbs hitting xfrm4_beet_output, causing unnecessary reallocations in ip_finish_output2. The skbs should still always have enough room to avoid causing skb_under_panic in skb_push since we have at least 16 bytes available from LL_RESERVED_SPACE in xfrm_state_check_space. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_mode_beet.c')
-rw-r--r--net/ipv4/xfrm4_mode_beet.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index 0f7c3e30e4e6..a73e710740c2 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -40,7 +40,7 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
if (unlikely(optlen))
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
- skb_push(skb, x->props.header_len + hdrlen);
+ skb_push(skb, x->props.header_len - IPV4_BEET_PHMAXLEN + hdrlen);
skb_reset_network_header(skb);
top_iph = ip_hdr(skb);
skb->transport_header += sizeof(*iph) - hdrlen;