Commit 7a1592bc authored by Hangbin Liu's avatar Hangbin Liu Committed by David S. Miller

tunnel: do not confirm neighbor when do pmtu update

When do tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.

v5: No Change.
v4: Update commit description
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
    dst_ops.update_pmtu to control whether we should do neighbor confirm.
    Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

Fixes: 0dec879f ("net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP")
Reviewed-by: default avatarGuillaume Nault <gnault@redhat.com>
Tested-by: default avatarGuillaume Nault <gnault@redhat.com>
Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarHangbin Liu <liuhangbin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 07dc35c6
...@@ -505,7 +505,7 @@ static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, ...@@ -505,7 +505,7 @@ static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
if (skb_valid_dst(skb)) if (skb_valid_dst(skb))
skb_dst_update_pmtu(skb, mtu); skb_dst_update_pmtu_no_confirm(skb, mtu);
if (skb->protocol == htons(ETH_P_IP)) { if (skb->protocol == htons(ETH_P_IP)) {
if (!skb_is_gso(skb) && if (!skb_is_gso(skb) &&
......
...@@ -640,7 +640,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, ...@@ -640,7 +640,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
if (rel_info > dst_mtu(skb_dst(skb2))) if (rel_info > dst_mtu(skb_dst(skb2)))
goto out; goto out;
skb_dst_update_pmtu(skb2, rel_info); skb_dst_update_pmtu_no_confirm(skb2, rel_info);
} }
icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
...@@ -1132,7 +1132,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, ...@@ -1132,7 +1132,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
IPV6_MIN_MTU : IPV4_MIN_MTU); IPV6_MIN_MTU : IPV4_MIN_MTU);
skb_dst_update_pmtu(skb, mtu); skb_dst_update_pmtu_no_confirm(skb, mtu);
if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
*pmtu = mtu; *pmtu = mtu;
err = -EMSGSIZE; err = -EMSGSIZE;
......
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