From: Stefano Brivio <sbrivio@redhat.com>
Date: Tue, 4 Aug 2020 07:53:45 +0200
Subject: geneve: Support for PMTU discovery on directly bridged links
Patch-mainline: v5.9-rc1
Git-commit: c1a800e88dbffca4ef48000cb3f9ad618dc7ad89
References: bsc#1176447

If the interface is a bridge or Open vSwitch port, and we can't
forward a packet because it exceeds the local PMTU estimate,
trigger an ICMP or ICMPv6 reply to the sender, using the same
interface to forward it back.

If metadata collection is enabled, set destination and source
addresses for the flow as if we were receiving the packet, so that
Open vSwitch can match the ICMP error against the existing
association.

v2: Use netif_is_any_bridge_port() (David Ahern)

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/geneve.c |   56 ++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 51 insertions(+), 5 deletions(-)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -893,8 +893,31 @@ static int geneve_xmit_skb(struct sk_buf
 	if (IS_ERR(rt))
 		return PTR_ERR(rt);
 
-	skb_tunnel_check_pmtu(skb, &rt->dst,
-			      GENEVE_IPV4_HLEN + info->options_len, false);
+	err = skb_tunnel_check_pmtu(skb, &rt->dst,
+				    GENEVE_IPV4_HLEN + info->options_len,
+				    netif_is_any_bridge_port(dev));
+	if (err < 0) {
+		dst_release(&rt->dst);
+		return err;
+	} else if (err) {
+		struct ip_tunnel_info *info;
+
+		info = skb_tunnel_info(skb);
+		if (info) {
+			info->key.u.ipv4.dst = fl4.saddr;
+			info->key.u.ipv4.src = fl4.daddr;
+		}
+
+		if (!pskb_may_pull(skb, ETH_HLEN)) {
+			dst_release(&rt->dst);
+			return -EINVAL;
+		}
+
+		skb->protocol = eth_type_trans(skb, geneve->dev);
+		netif_rx(skb);
+		dst_release(&rt->dst);
+		return -EMSGSIZE;
+	}
 
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	if (geneve->cfg.collect_md) {
@@ -955,8 +978,30 @@ static int geneve6_xmit_skb(struct sk_bu
 	if (IS_ERR(dst))
 		return PTR_ERR(dst);
 
-	skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len,
-			      false);
+	err = skb_tunnel_check_pmtu(skb, dst,
+				    GENEVE_IPV6_HLEN + info->options_len,
+				    netif_is_any_bridge_port(dev));
+	if (err < 0) {
+		dst_release(dst);
+		return err;
+	} else if (err) {
+		struct ip_tunnel_info *info = skb_tunnel_info(skb);
+
+		if (info) {
+			info->key.u.ipv6.dst = fl6.saddr;
+			info->key.u.ipv6.src = fl6.daddr;
+		}
+
+		if (!pskb_may_pull(skb, ETH_HLEN)) {
+			dst_release(dst);
+			return -EINVAL;
+		}
+
+		skb->protocol = eth_type_trans(skb, geneve->dev);
+		netif_rx(skb);
+		dst_release(dst);
+		return -EMSGSIZE;
+	}
 
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	if (geneve->cfg.collect_md) {
@@ -1013,7 +1058,8 @@ static netdev_tx_t geneve_xmit(struct sk
 	if (likely(!err))
 		return NETDEV_TX_OK;
 
-	dev_kfree_skb(skb);
+	if (err != -EMSGSIZE)
+		dev_kfree_skb(skb);
 
 	if (err == -ELOOP)
 		dev->stats.collisions++;