netdev - Re: [PATCH net-next v5 3/5] net: vxlan: bind vxlan sockets to their local address if configured

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Message-ID: <20250813070758.120210-1-kuniyu@google.com>
Date: Wed, 13 Aug 2025 07:07:22 +0000
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: richardbgobert@...il.com
Cc: andrew+netdev@...n.ch, daniel@...earbox.net, davem@...emloft.net, 
	donald.hunter@...il.com, dsahern@...nel.org, edumazet@...gle.com, 
	horms@...nel.org, idosch@...dia.com, jacob.e.keller@...el.com, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...nel.org, 
	menglong8.dong@...il.com, netdev@...r.kernel.org, pabeni@...hat.com, 
	petrm@...dia.com, razor@...ckwall.org, shuah@...nel.org
Subject: Re: [PATCH net-next v5 3/5] net: vxlan: bind vxlan sockets to their
 local address if configured

From: Richard Gobert <richardbgobert@...il.com>
Date: Tue, 12 Aug 2025 14:51:53 +0200
> diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
> index 15fe9d83c724..12da9595436e 100644
> --- a/drivers/net/vxlan/vxlan_core.c
> +++ b/drivers/net/vxlan/vxlan_core.c
> @@ -78,18 +78,34 @@ static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
>  }
>  
>  /* Find VXLAN socket based on network namespace, address family, UDP port,
> - * enabled unshareable flags and socket device binding (see l3mdev with
> - * non-default VRF).
> + * bound address, enabled unshareable flags and socket device binding
> + * (see l3mdev with non-default VRF).
>   */
>  static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
> -					  __be16 port, u32 flags, int ifindex)
> +					  __be16 port, u32 flags, int ifindex,
> +					  union vxlan_addr *saddr)
>  {
>  	struct vxlan_sock *vs;
>  
>  	flags &= VXLAN_F_RCV_FLAGS;

VXLAN_F_LOCALBIND seems to be cleared ?

>  
>  	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
> -		if (inet_sk(vs->sock->sk)->inet_sport == port &&
> +		struct sock *sk = vs->sock->sk;
> +		struct inet_sock *inet = inet_sk(sk);
> +
> +		if (flags & VXLAN_F_LOCALBIND) {

Does selftest exercise this path ?


> +			if (family == AF_INET &&
> +			    inet->inet_rcv_saddr != saddr->sin.sin_addr.s_addr)
> +				continue;
> +#if IS_ENABLED(CONFIG_IPV6)
> +			else if (family == AF_INET6 &&
> +				 ipv6_addr_cmp(&sk->sk_v6_rcv_saddr,
> +					       &saddr->sin6.sin6_addr) != 0)
> +				continue;
> +#endif
> +		}
> +
> +		if (inet->inet_sport == port &&
>  		    vxlan_get_sk_family(vs) == family &&
>  		    vs->flags == flags &&
>  		    vs->sock->sk->sk_bound_dev_if == ifindex)