diff options
Diffstat (limited to 'net/ipv4/esp4.c')
| -rw-r--r-- | net/ipv4/esp4.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index 9d1881c07a3..9bbdd449455 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -143,10 +143,9 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) int alen = esp->auth.icv_trunc_len; int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen; int nfrags; - int encap_len = 0; + int ihl; u8 nexthdr[2]; struct scatterlist *sg; - u8 workbuf[60]; int padlen; if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr))) @@ -177,7 +176,6 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) skb->ip_summed = CHECKSUM_NONE; esph = (struct ip_esp_hdr*)skb->data; - iph = skb->nh.iph; /* Get ivec. This can be wrong, check against another impls. */ if (esp->conf.ivlen) @@ -204,12 +202,12 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) /* ... check padding bits here. Silly. :-) */ + iph = skb->nh.iph; + ihl = iph->ihl * 4; + if (x->encap) { struct xfrm_encap_tmpl *encap = x->encap; - struct udphdr *uh; - - uh = (struct udphdr *)(iph + 1); - encap_len = (void*)esph - (void*)uh; + struct udphdr *uh = (void *)(skb->nh.raw + ihl); /* * 1) if the NAT-T peer's IP or port changed then @@ -246,11 +244,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) iph->protocol = nexthdr[1]; pskb_trim(skb, skb->len - alen - padlen - 2); - memcpy(workbuf, skb->nh.raw, iph->ihl*4); - skb->h.raw = skb_pull(skb, sizeof(struct ip_esp_hdr) + esp->conf.ivlen); - skb->nh.raw += encap_len + sizeof(struct ip_esp_hdr) + esp->conf.ivlen; - memcpy(skb->nh.raw, workbuf, iph->ihl*4); - skb->nh.iph->tot_len = htons(skb->len); + skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - ihl; return 0; |