IPVS: skb defrag in L7 helpers

L7 helpers like sip needs skb defrag
since L7 data can be fragmented.

This patch requires "IPVS Break ports-2 into src_port and dst_port" patch
Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

net/netfilter/ipvs/ip_vs_pe_sip.c

@@ -71,6 +71,7 @@ ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct sk_buff *skb)
 	struct ip_vs_iphdr iph;
 	unsigned int dataoff, datalen, matchoff, matchlen;
 	const char *dptr;
+	int retc;
 
 	ip_vs_fill_iphdr(p->af, skb_network_header(skb), &iph);
 
@@ -83,6 +84,8 @@ ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct sk_buff *skb)
 	if (dataoff >= skb->len)
 		return -EINVAL;
 
+	if ((retc=skb_linearize(skb)) < 0)
+		return retc;
 	dptr = skb->data + dataoff;
 	datalen = skb->len - dataoff;