netdev - [PATCH net-next 1/6] lwtunnel: add options process for arp request

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Message-Id: <ec8435ca550a364b793bd8f307d6c2751931e684.1568617721.git.lucien.xin@gmail.com>
Date:   Mon, 16 Sep 2019 15:10:15 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, Jiri Benc <jbenc@...hat.com>,
        Thomas Graf <tgraf@...g.ch>, u9012063@...il.com
Subject: [PATCH net-next 1/6] lwtunnel: add options process for arp request

Without options copied to the dst tun_info in iptunnel_metadata_reply()
called by arp_process for handling arp_request, the generated arp_reply
packet may be dropped or sent out with wrong options for some tunnels
like erspan and vxlan, and the traffic will break.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/ipv4/ip_tunnel_core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 1452a97..10f0848 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -126,15 +126,14 @@ struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 
 	if (!md || md->type != METADATA_IP_TUNNEL ||
 	    md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
-
 		return NULL;
 
-	res = metadata_dst_alloc(0, METADATA_IP_TUNNEL, flags);
+	src = &md->u.tun_info;
+	res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
 	if (!res)
 		return NULL;
 
 	dst = &res->u.tun_info;
-	src = &md->u.tun_info;
 	dst->key.tun_id = src->key.tun_id;
 	if (src->mode & IP_TUNNEL_INFO_IPV6)
 		memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
@@ -143,6 +142,8 @@ struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 		dst->key.u.ipv4.dst = src->key.u.ipv4.src;
 	dst->key.tun_flags = src->key.tun_flags;
 	dst->mode = src->mode | IP_TUNNEL_INFO_TX;
+	ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
+				src->options_len, 0);
 
 	return res;
 }
-- 
2.1.0