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Diffstat (limited to 'net/ipv4/ipcomp.c')
-rw-r--r--net/ipv4/ipcomp.c23
1 files changed, 5 insertions, 18 deletions
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 95278b22b669..8e243589045f 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -45,7 +45,6 @@ static LIST_HEAD(ipcomp_tfms_list);
static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
{
int err, plen, dlen;
- struct iphdr *iph;
struct ipcomp_data *ipcd = x->data;
u8 *start, *scratch;
struct crypto_tfm *tfm;
@@ -74,8 +73,6 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
skb_put(skb, dlen - plen);
memcpy(skb->data, scratch, dlen);
- iph = skb->nh.iph;
- iph->tot_len = htons(dlen + iph->ihl * 4);
out:
put_cpu();
return err;
@@ -83,14 +80,9 @@ out:
static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
{
- u8 nexthdr;
int err = 0;
struct iphdr *iph;
- union {
- struct iphdr iph;
- char buf[60];
- } tmp_iph;
-
+ struct ip_comp_hdr *ipch;
if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
skb_linearize(skb, GFP_ATOMIC) != 0) {
@@ -102,15 +94,10 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
/* Remove ipcomp header and decompress original payload */
iph = skb->nh.iph;
- memcpy(&tmp_iph, iph, iph->ihl * 4);
- nexthdr = *(u8 *)skb->data;
- skb_pull(skb, sizeof(struct ip_comp_hdr));
- skb->nh.raw += sizeof(struct ip_comp_hdr);
- memcpy(skb->nh.raw, &tmp_iph, tmp_iph.iph.ihl * 4);
- iph = skb->nh.iph;
- iph->tot_len = htons(ntohs(iph->tot_len) - sizeof(struct ip_comp_hdr));
- iph->protocol = nexthdr;
- skb->h.raw = skb->data;
+ ipch = (void *)skb->data;
+ iph->protocol = ipch->nexthdr;
+ skb->h.raw = skb->nh.raw + sizeof(*ipch);
+ __skb_pull(skb, sizeof(*ipch));
err = ipcomp_decompress(x, skb);
out: