netdev - Re: [PATCH V2 net-next 07/14] net/tls: Support TLS device offload with IPv6

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Message-ID: <d623296b-a49a-089f-a0f7-b4b59d68ac6f@cogentembedded.com>
Date:   Thu, 22 Mar 2018 12:36:59 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Dave Watson <davejwatson@...com>,
        Boris Pismenny <borisp@...lanox.com>,
        Ilya Lesokhin <ilyal@...lanox.com>
Subject: Re: [PATCH V2 net-next 07/14] net/tls: Support TLS device offload
 with IPv6

Hello!

On 3/22/2018 12:01 AM, Saeed Mahameed wrote:

> From: Ilya Lesokhin <ilyal@...lanox.com>
> 
> Previously get_netdev_for_sock worked only with IPv4.
> 
> Signed-off-by: Ilya Lesokhin <ilyal@...lanox.com>
> Signed-off-by: Boris Pismenny <borisp@...lanox.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>

    Only stylistic comments...

> ---
>   net/tls/tls_device.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 48 insertions(+), 1 deletion(-)
> 
> diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
> index e623280ea019..c35fc107d9c5 100644
> --- a/net/tls/tls_device.c
> +++ b/net/tls/tls_device.c
> @@ -34,6 +34,11 @@
>   #include <net/inet_common.h>
>   #include <linux/highmem.h>
>   #include <linux/netdevice.h>
> +#include <net/addrconf.h>
> +#include <net/flow.h>
> +#include <linux/ipv6.h>
> +#include <net/dst.h>
> +#include <linux/security.h>
>   
>   #include <net/tls.h>
>   #include <crypto/aead.h>
> @@ -99,13 +104,55 @@ static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
>   	spin_unlock_irqrestore(&tls_device_lock, flags);
>   }
>   
> +static inline struct net_device *ipv6_get_netdev(struct sock *sk)
> +{
> +	struct net_device *dev = NULL;
> +#if IS_ENABLED(CONFIG_IPV6)
> +	struct inet_sock *inet = inet_sk(sk);
> +	struct ipv6_pinfo *np = inet6_sk(sk);
> +	struct flowi6 _fl6, *fl6 = &_fl6;
> +	struct dst_entry *dst;
> +
> +	memset(fl6, 0, sizeof(*fl6));
> +	fl6->flowi6_proto = sk->sk_protocol;
> +	fl6->daddr = sk->sk_v6_daddr;
> +	fl6->saddr = np->saddr;
> +	fl6->flowlabel = np->flow_label;
> +	IP6_ECN_flow_xmit(sk, fl6->flowlabel);
> +	fl6->flowi6_oif = sk->sk_bound_dev_if;
> +	fl6->flowi6_mark = sk->sk_mark;
> +	fl6->fl6_sport = inet->inet_sport;
> +	fl6->fl6_dport = inet->inet_dport;
> +	fl6->flowi6_uid = sk->sk_uid;
> +	security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
> +
> +	if (ipv6_stub->ipv6_dst_lookup(sock_net(sk), sk, &dst, fl6) < 0)
> +		return NULL;
> +
> +	dev = dst->dev;
> +	dev_hold(dev);
> +	dst_release(dst);
> +
> +#endif

    I think the above empty line should be outside #if as you need an empty 
line between the declaration and other statements.

> +	return dev;
> +}
> +
>   /* We assume that the socket is already connected */
>   static struct net_device *get_netdev_for_sock(struct sock *sk)
>   {
>   	struct inet_sock *inet = inet_sk(sk);
>   	struct net_device *netdev = NULL;
>   
> -	netdev = dev_get_by_index(sock_net(sk), inet->cork.fl.flowi_oif);
> +	if (sk->sk_family == AF_INET)
> +		netdev = dev_get_by_index(sock_net(sk),
> +					  inet->cork.fl.flowi_oif);
> +	else if (sk->sk_family == AF_INET6) {

    Need {} in the 1st *if* branch since you have it in the 2nd.

> +		netdev = ipv6_get_netdev(sk);
> +		if (!netdev && !sk->sk_ipv6only &&
> +		    ipv6_addr_type(&sk->sk_v6_daddr) == IPV6_ADDR_MAPPED)
> +			netdev = dev_get_by_index(sock_net(sk),
> +						  inet->cork.fl.flowi_oif);
> +	}
>   
>   	return netdev;
>   }

MBR, Sergei