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ip_tunnel: Make none-tunnel-dst tunnel port work with lwtunnel

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ip l add dev tun type gretap key 1000
ip a a dev tun 10.0.0.1/24

Packets with tun-id 1000 can be recived by tun dev. But packet can't
be sent through dev tun for non-tunnel-dst

With this patch: tunnel-dst can be get through lwtunnel like beflow:
ip r a 10.0.0.7 encap ip dst 172.168.0.11 dev tun

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wenxu 2019-01-19 13:11:25 +08:00 committed by David S. Miller
parent 63530aba78
commit d71b57532d
1 changed files with 7 additions and 1 deletions
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8
net/ipv4/ip_tunnel.c
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@ -644,13 +644,19 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
dst = tnl_params->daddr; dst = tnl_params->daddr;
if (dst == 0) { if (dst == 0) {
/* NBMA tunnel */ /* NBMA tunnel */
struct ip_tunnel_info *tun_info;
if (!skb_dst(skb)) { if (!skb_dst(skb)) {
dev->stats.tx_fifo_errors++; dev->stats.tx_fifo_errors++;
goto tx_error; goto tx_error;
} }
if (skb->protocol == htons(ETH_P_IP)) { tun_info = skb_tunnel_info(skb);
if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
ip_tunnel_info_af(tun_info) == AF_INET &&
tun_info->key.u.ipv4.dst)
dst = tun_info->key.u.ipv4.dst;
else if (skb->protocol == htons(ETH_P_IP)) {
rt = skb_rtable(skb); rt = skb_rtable(skb);
dst = rt_nexthop(rt, inner_iph->daddr); dst = rt_nexthop(rt, inner_iph->daddr);
} }