diff options
| author | Haishuang Yan <yanhaishuang@cmss.chinamobile.com> | 2018-09-14 12:26:48 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-16 15:32:59 -0700 |
| commit | a82738adff167593bbb9df90b4201ce4b3407d21 (patch) | |
| tree | 1b7ca441e21895ba2b2cd5765360a7a9e37ff075 | |
| parent | b0350d51f001e6edc13ee4f253b98b50b05dd401 (diff) | |
| download | linux-a82738adff167593bbb9df90b4201ce4b3407d21.tar.gz | |
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: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/ip6_gre.c | 26 |
1 files changed, 4 insertions, 22 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index e493b041d4ac..515adbdba1d2 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -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; |