netdev - Re: [PATCH net-next v2] net: Move VRF change to udp

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Date:	Tue, 18 Aug 2015 09:03:17 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org, tom@...bertland.com
Subject: Re: [PATCH net-next v2] net: Move VRF change to udp_sendmsg to
 function

On Tue, 2015-08-18 at 09:38 -0600, David Ahern wrote:
> Functionally equivalent, but as a separate function with VRF config
> check. After 2f52bdcf6ba ("net: Updates to netif_index_is_vrf") function
> completely compiles out if VRF is not enabled; additional CONFIG
> check is not needed.
> 
> Suggested-by: Tom Herbert <tom@...bertland.com>
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
> ---
> v2
> - removed inline per Dave's comment
> - removed IS_ENABLED(CONFIG_NET_VRF) check; no longer needed after 2f52bdcf6ba
> 
>  net/ipv4/udp.c | 43 +++++++++++++++++++++++--------------------
>  1 file changed, 23 insertions(+), 20 deletions(-)
> 
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index c0a15e7f359f..76c5e5e945f8 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -873,6 +873,24 @@ int udp_push_pending_frames(struct sock *sk)
>  }
>  EXPORT_SYMBOL(udp_push_pending_frames);
>  
> +/* unconnected socket. If output device is enslaved to a VRF
> + * device lookup source address from VRF table.
> + */
> +static void udp_sendmsg_vrf_saddr(struct net *net, struct flowi4 *fl4,
> +				   int oif, struct sock *sk)
> +{
> +	if (netif_index_is_vrf(net, oif)) {
> +		__u8 flow_flags = fl4->flowi4_flags;
> +		struct rtable *rt;
> +
> +		fl4->flowi4_flags = flow_flags | FLOWI_FLAG_VRFSRC;
> +		rt = ip_route_output_flow(net, fl4, sk);
> +		if (!IS_ERR(rt))
> +			ip_rt_put(rt);

This looks buggy. What happened to saddr = fl4->saddr; ?

> +		fl4->flowi4_flags = flow_flags;
> +	}
> +}
> +
>  int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
>  {
>  	struct inet_sock *inet = inet_sk(sk);
> @@ -1013,33 +1033,16 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
>  
>  	if (!rt) {
>  		struct net *net = sock_net(sk);
> -		__u8 flow_flags = inet_sk_flowi_flags(sk);
>  
>  		fl4 = &fl4_stack;
>  
> -		/* unconnected socket. If output device is enslaved to a VRF
> -		 * device lookup source address from VRF table. This mimics
> -		 * behavior of ip_route_connect{_init}.
> -		 */
> -		if (netif_index_is_vrf(net, ipc.oif)) {
> -			flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
> -					   RT_SCOPE_UNIVERSE, sk->sk_protocol,
> -					   (flow_flags | FLOWI_FLAG_VRFSRC),
> -					   faddr, saddr, dport,
> -					   inet->inet_sport);
> -
> -			rt = ip_route_output_flow(net, fl4, sk);
> -			if (!IS_ERR(rt)) {
> -				saddr = fl4->saddr;
> -				ip_rt_put(rt);
> -			}
> -		}
> -
>  		flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
>  				   RT_SCOPE_UNIVERSE, sk->sk_protocol,
> -				   flow_flags,
> +				   inet_sk_flowi_flags(sk),
>  				   faddr, saddr, dport, inet->inet_sport);
>  
> +		udp_sendmsg_vrf_saddr(net, fl4, ipc.oif, sk);
> +
>  		security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
>  		rt = ip_route_output_flow(net, fl4, sk);
>  		if (IS_ERR(rt)) {


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