ip_gre: Make none-tun-dst gre tunnel store tunnel info as metadat_dst in recv
Currently collect_md gre tunnel will store the tunnel info(metadata_dst) to skb_dst. And now the non-tun-dst gre tunnel already can add tunnel header through lwtunnel. When received a arp_request on the non-tun-dst gre tunnel. The packet of arp response will send through the non-tun-dst tunnel without tunnel info which will lead the arp response packet to be dropped. If the non-tun-dst gre tunnel also store the tunnel info as metadata_dst, The arp response packet will set the releted tunnel info in the iptunnel_metadata_reply. The following is the test script: ip netns add cl ip l add dev vethc type veth peer name eth0 netns cl ifconfig vethc 172.168.0.7/24 up ip l add dev tun1000 type gretap key 1000 ip link add user1000 type vrf table 1 ip l set user1000 up ip l set dev tun1000 master user1000 ifconfig tun1000 10.0.1.1/24 up ip netns exec cl ifconfig eth0 172.168.0.17/24 up ip netns exec cl ip l add dev tun type gretap local 172.168.0.17 remote 172.168.0.7 key 1000 ip netns exec cl ifconfig tun 10.0.1.7/24 up ip r r 10.0.1.7 encap ip id 1000 dst 172.168.0.17 key dev tun1000 table 1 With this patch ip netns exec cl ping 10.0.1.1 can success Signed-off-by: wenxu <wenxu@ucloud.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -340,6 +340,8 @@ static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
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iph->saddr, iph->daddr, tpi->key);
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if (tunnel) {
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const struct iphdr *tnl_params;
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if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
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raw_proto, false) < 0)
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goto drop;
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@ -348,7 +350,9 @@ static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
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skb_pop_mac_header(skb);
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else
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skb_reset_mac_header(skb);
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if (tunnel->collect_md) {
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tnl_params = &tunnel->parms.iph;
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if (tunnel->collect_md || tnl_params->daddr == 0) {
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__be16 flags;
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__be64 tun_id;
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