linux-kernel - [PATCH net-next 1/2] net: vxlan: enable local address bind for vxlan sockets

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Date: Thu, 22 Feb 2024 21:51:09 +0100
From: Richard Gobert <richardbgobert@...il.com>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, idosch@...dia.com, razor@...ckwall.org,
 amcohen@...dia.com, petrm@...dia.com, jbenc@...hat.com, b.galvani@...il.com,
 bpoirier@...dia.com, gavinl@...dia.com, martin.lau@...nel.org,
 daniel@...earbox.net, herbert@...dor.apana.org.au, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/2] net: vxlan: enable local address bind for vxlan
 sockets

This patch adds support for binding to a local address in vxlan sockets.
It achieves this by using vxlan_addr union to represent a local address
to bind to, and copying it to udp_port_cfg in vxlan_create_sock.

Signed-off-by: Richard Gobert <richardbgobert@...il.com>
---
 drivers/net/vxlan/vxlan_core.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 16106e088c63..b5f3f946ebcd 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -3479,8 +3479,9 @@ static const struct ethtool_ops vxlan_ethtool_ops = {
 	.get_link_ksettings	= vxlan_get_link_ksettings,
 };
 
-static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
-					__be16 port, u32 flags, int ifindex)
+static struct socket *vxlan_create_sock(struct net *net, bool ipv6, __be16 port,
+					u32 flags, int ifindex,
+					union vxlan_addr addr)
 {
 	struct socket *sock;
 	struct udp_port_cfg udp_conf;
@@ -3493,8 +3494,15 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
 		udp_conf.use_udp6_rx_checksums =
 		    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
 		udp_conf.ipv6_v6only = 1;
+		memcpy(&udp_conf.local_ip6.s6_addr32,
+		       &addr.sin6.sin6_addr.s6_addr32,
+		       sizeof(addr.sin6.sin6_addr.s6_addr32));
 	} else {
 		udp_conf.family = AF_INET;
+		udp_conf.local_ip.s_addr = addr.sin.sin_addr.s_addr;
+		memcpy(&udp_conf.local_ip.s_addr,
+		       &addr.sin.sin_addr.s_addr,
+		       sizeof(addr.sin.sin_addr.s_addr));
 	}
 
 	udp_conf.local_udp_port = port;
@@ -3512,7 +3520,8 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
 /* Create new listen socket if needed */
 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
 					      __be16 port, u32 flags,
-					      int ifindex)
+					      int ifindex,
+					      union vxlan_addr addr)
 {
 	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 	struct vxlan_sock *vs;
@@ -3527,7 +3536,7 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
 	for (h = 0; h < VNI_HASH_SIZE; ++h)
 		INIT_HLIST_HEAD(&vs->vni_list[h]);
 
-	sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
+	sock = vxlan_create_sock(net, ipv6, port, flags, ifindex, addr);
 	if (IS_ERR(sock)) {
 		kfree(vs);
 		return ERR_CAST(sock);
@@ -3591,7 +3600,7 @@ static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
 	if (!vs)
 		vs = vxlan_socket_create(vxlan->net, ipv6,
 					 vxlan->cfg.dst_port, vxlan->cfg.flags,
-					 l3mdev_index);
+					 l3mdev_index, vxlan->cfg.saddr);
 	if (IS_ERR(vs))
 		return PTR_ERR(vs);
 #if IS_ENABLED(CONFIG_IPV6)
-- 
2.36.1