From cb73ee40b1b381eaf3749e6dbeed567bb38e5258 Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi Date: Fri, 18 Jan 2019 12:05:39 +0100 Subject: net: ip_gre: use erspan key field for tunnel lookup Use ERSPAN key header field as tunnel key in gre_parse_header routine since ERSPAN protocol sets the key field of the external GRE header to 0 resulting in a tunnel lookup fail in ip6gre_err. In addition remove key field parsing and pskb_may_pull check in erspan_rcv and ip6erspan_rcv Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support") Signed-off-by: Lorenzo Bianconi Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 9 --------- 1 file changed, 9 deletions(-) (limited to 'net/ipv4/ip_gre.c') diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index b1a74d80d868..20a64fe6254b 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -268,20 +268,11 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, int len; itn = net_generic(net, erspan_net_id); - len = gre_hdr_len + sizeof(*ershdr); - - /* Check based hdr len */ - if (unlikely(!pskb_may_pull(skb, len))) - return PACKET_REJECT; iph = ip_hdr(skb); ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); ver = ershdr->ver; - /* The original GRE header does not have key field, - * Use ERSPAN 10-bit session ID as key. - */ - tpi->key = cpu_to_be32(get_session_id(ershdr)); tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags | TUNNEL_KEY, iph->saddr, iph->daddr, tpi->key); -- cgit v1.2.3-59-g8ed1b