linux-kernel - Re: [RFC PATCH iproute2] bridge: add support for L2 multicast groups

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Date:   Thu, 22 Oct 2020 12:52:20 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     David Ahern <dsahern@...il.com>, Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, andrew@...n.ch, f.fainelli@...il.com,
        vivien.didelot@...il.com, jiri@...lanox.com, idosch@...sch.org
Subject: Re: [RFC PATCH iproute2] bridge: add support for L2 multicast
 groups

On Sat, 17 Oct 2020 21:45:26 +0300
Vladimir Oltean <vladimir.oltean@....com> wrote:

> Extend the 'bridge mdb' command for the following syntax:
> bridge mdb add dev br0 port swp0 grp 01:02:03:04:05:06 permanent
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>  bridge/mdb.c                   | 54 ++++++++++++++++++++++++++--------
>  include/uapi/linux/if_bridge.h |  2 ++
>  2 files changed, 43 insertions(+), 13 deletions(-)
> 
> diff --git a/bridge/mdb.c b/bridge/mdb.c
> index 4cd7ca762b78..af160250928e 100644
> --- a/bridge/mdb.c
> +++ b/bridge/mdb.c
> @@ -149,6 +149,7 @@ static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e,
>  			    struct nlmsghdr *n, struct rtattr **tb)
>  {
>  	const void *grp, *src;
> +	const char *addr;
>  	SPRINT_BUF(abuf);
>  	const char *dev;
>  	int af;
> @@ -156,9 +157,16 @@ static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e,
>  	if (filter_vlan && e->vid != filter_vlan)
>  		return;
>  
> -	af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6;
> -	grp = af == AF_INET ? (const void *)&e->addr.u.ip4 :
> -			      (const void *)&e->addr.u.ip6;
> +	if (!e->addr.proto) {
> +		af = AF_PACKET;
> +		grp = (const void *)&e->addr.u.mac_addr;
> +	} else if (e->addr.proto == htons(ETH_P_IP)) {
> +		af = AF_INET;
> +		grp = (const void *)&e->addr.u.ip4;
> +	} else {
> +		af = AF_INET6;
> +		grp = (const void *)&e->addr.u.ip6;
> +	}
>  	dev = ll_index_to_name(ifindex);
>  

In C casts of pointer to void are not necessary.