[XFRM]: beet: fix IP option decapsulation

Beet mode looks for the beet pseudo header after the outer IP header,
which is wrong since that is followed by the ESP header. Additionally
it needs to adjust the packet length after removing the pseudo header
and point the data pointer to the real data location.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/xfrm4_mode_beet.c

@@ -78,10 +78,11 @@ static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 	protocol = iph->protocol;
 
 	if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
-		struct ip_beet_phdr *ph = (struct ip_beet_phdr*)(iph + 1);
+		struct ip_beet_phdr *ph;
 
 		if (!pskb_may_pull(skb, sizeof(*ph)))
 			goto out;
+		ph = (struct ip_beet_phdr *)(skb->h.ipiph + 1);
 
 		phlen = sizeof(*ph) + ph->padlen;
 		optlen = ph->hdrlen * 8 - phlen;
@@ -90,6 +91,7 @@ static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 
 		if (!pskb_may_pull(skb, phlen + optlen))
 			goto out;
+		skb->len -= phlen + optlen;
 
 		ph_nexthdr = ph->nexthdr;
 	}
@@ -97,6 +99,7 @@ static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 	skb->nh.raw = skb->data + (phlen - sizeof(*iph));
 	memmove(skb->nh.raw, iph, sizeof(*iph));
 	skb->h.raw = skb->data + (phlen + optlen);
+	skb->data = skb->h.raw;
 
 	iph = skb->nh.iph;
 	iph->ihl = (sizeof(*iph) + optlen) / 4;