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Commit a82738ad authored by Haishuang Yan's avatar Haishuang Yan Committed by David S. Miller
Browse files

ip6_gre: simplify gre header parsing in ip6gre_err 



Same as ip_gre, use gre_parse_header to parse gre header in gre error
handler code.

Signed-off-by: default avatarHaishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b0350d51

net/ipv6/ip6_gre.c

+4 −22
Original line number Diff line number Diff line
@@ -427,35 +427,17 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 
		       u8 type, u8 code, int offset, __be32 info)

{

	struct net *net = dev_net(skb->dev);

	const struct gre_base_hdr *greh;

	const struct ipv6hdr *ipv6h;

	int grehlen = sizeof(*greh);

	struct tnl_ptk_info tpi;

	struct ip6_tnl *t;

	int key_off = 0;

	__be16 flags;

	__be32 key;



	if (!pskb_may_pull(skb, offset + grehlen))

		return;

	greh = (const struct gre_base_hdr *)(skb->data + offset);

	flags = greh->flags;

	if (flags & (GRE_VERSION | GRE_ROUTING))

	if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),

			     offset) < 0)

		return;

	if (flags & GRE_CSUM)

		grehlen += 4;

	if (flags & GRE_KEY) {

		key_off = grehlen + offset;

		grehlen += 4;

	}



	if (!pskb_may_pull(skb, offset + grehlen))

		return;

	ipv6h = (const struct ipv6hdr *)skb->data;

	greh = (const struct gre_base_hdr *)(skb->data + offset);

	key = key_off ? *(__be32 *)(skb->data + key_off) : 0;



	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,

				 key, greh->protocol);

				 tpi.key, tpi.proto);

	if (!t)

		return;