netdev - Re: [PATCH net-next 1/1] net: Add new protocol attribute to IP addresses

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Date:   Thu, 3 Feb 2022 19:07:57 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jacques de Laval <Jacques.De.Laval@...termo.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/1] net: Add new protocol attribute to IP
 addresses

On Thu, 3 Feb 2022 17:31:06 +0100 Jacques de Laval wrote:
> diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
> index 653e7d0f65cb..f7c270b24167 100644
> --- a/include/net/if_inet6.h
> +++ b/include/net/if_inet6.h
> @@ -73,6 +73,8 @@ struct inet6_ifaddr {
>  
>  	struct rcu_head		rcu;
>  	struct in6_addr		peer_addr;
> +
> +	__u8			ifa_proto;

nit: the __ types are for uAPI, you can use a normal u8 here.

>  };
>  
>  struct ip6_sf_socklist {
> diff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h
> index dfcf3ce0097f..2aa46b9c9961 100644
> --- a/include/uapi/linux/if_addr.h
> +++ b/include/uapi/linux/if_addr.h

> @@ -69,4 +70,7 @@ struct ifa_cacheinfo {
>  #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
>  #endif
>  
> +/* ifa_protocol */
> +#define IFAPROT_UNSPEC	0
> +
>  #endif

What's the purpose of defining this as a constant?