From 3df1928302950dfa728ab2eade28eea0da291567 Mon Sep 17 00:00:00 2001 From: William Tu Date: Mon, 5 Feb 2018 13:35:34 -0800 Subject: net: erspan: fix metadata extraction Commit d350a823020e ("net: erspan: create erspan metadata uapi header") moves the erspan 'version' in front of the 'struct erspan_md2' for later extensibility reason. This breaks the existing erspan metadata extraction code because the erspan_md2 then has a 4-byte offset to between the erspan_metadata and erspan_base_hdr. This patch fixes it. Fixes: 1a66a836da63 ("gre: add collect_md mode to ERSPAN tunnel") Fixes: ef7baf5e083c ("ip6_gre: add ip6 erspan collect_md mode") Fixes: 1d7e2ed22f8d ("net: erspan: refactor existing erspan code") Signed-off-by: William Tu Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'net/ipv4/ip_gre.c') diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 6ec670fbbbdd..9b50eddd1882 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -261,6 +261,7 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, struct ip_tunnel_net *itn; struct ip_tunnel *tunnel; const struct iphdr *iph; + struct erspan_md2 *md2; int ver; int len; @@ -313,8 +314,10 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, return PACKET_REJECT; md = ip_tunnel_info_opts(&tun_dst->u.tun_info); - memcpy(md, pkt_md, sizeof(*md)); md->version = ver; + md2 = &md->u.md2; + memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : + ERSPAN_V2_MDSIZE); info = &tun_dst->u.tun_info; info->key.tun_flags |= TUNNEL_ERSPAN_OPT; -- cgit v1.2.3