netdev - Re: [PATCH net-next 5/6] net: bridge: fdb: add support for flush filtering based on ifindex

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Date:   Mon, 11 Apr 2022 12:03:56 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, roopa@...dia.com, kuba@...nel.org,
        davem@...emloft.net, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 5/6] net: bridge: fdb: add support for flush
 filtering based on ifindex

On 11/04/2022 11:57, Ido Schimmel wrote:
> On Sat, Apr 09, 2022 at 01:58:56PM +0300, Nikolay Aleksandrov wrote:
>> Add support for fdb flush filtering based on destination ifindex. The
>> ifindex must either match a port's device ifindex or the bridge's.
>>
>> Signed-off-by: Nikolay Aleksandrov <razor@...ckwall.org>
>> ---
>>  include/uapi/linux/if_bridge.h | 1 +
>>  net/bridge/br_fdb.c            | 7 +++++++
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
>> index 4638d7e39f2a..67ee12586844 100644
>> --- a/include/uapi/linux/if_bridge.h
>> +++ b/include/uapi/linux/if_bridge.h
>> @@ -819,6 +819,7 @@ enum {
>>  	FDB_FLUSH_NDM_STATE_MASK,
>>  	FDB_FLUSH_NDM_FLAGS,
>>  	FDB_FLUSH_NDM_FLAGS_MASK,
>> +	FDB_FLUSH_PORT_IFINDEX,
>>  	__FDB_FLUSH_MAX
>>  };
>>  #define FDB_FLUSH_MAX (__FDB_FLUSH_MAX - 1)
>> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
>> index 340a2ace1d5e..53208adf7474 100644
>> --- a/net/bridge/br_fdb.c
>> +++ b/net/bridge/br_fdb.c
>> @@ -628,6 +628,7 @@ static const struct nla_policy br_fdb_flush_policy[FDB_FLUSH_MAX + 1] = {
>>  	[FDB_FLUSH_NDM_FLAGS]	= { .type = NLA_U16 },
>>  	[FDB_FLUSH_NDM_STATE_MASK]	= { .type = NLA_U16 },
>>  	[FDB_FLUSH_NDM_FLAGS_MASK]	= { .type = NLA_U16 },
>> +	[FDB_FLUSH_PORT_IFINDEX]	= { .type = NLA_S32 },
>>  };
>>  
>>  int br_fdb_flush_nlattr(struct net_bridge *br, struct nlattr *fdb_flush_attr,
>> @@ -664,6 +665,12 @@ int br_fdb_flush_nlattr(struct net_bridge *br, struct nlattr *fdb_flush_attr,
>>  		ndm_flags_mask = nla_get_u16(fdb_flush_tb[FDB_FLUSH_NDM_FLAGS_MASK]);
>>  		desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask);
>>  	}
>> +	if (fdb_flush_tb[FDB_FLUSH_PORT_IFINDEX]) {
>> +		int port_ifidx;
>> +
>> +		port_ifidx = nla_get_u32(fdb_flush_tb[FDB_FLUSH_PORT_IFINDEX]);
>> +		desc.port_ifindex = port_ifidx;
> 
> Commit message says "ifindex must either match a port's device ifindex
> or the bridge's", but there is no validation. I realize such an
> operation won't flush anything, but it's cleaner to just reject it here.
> 

Sure, I can add a check for the device when specified.

>> +	}
>>  
>>  	br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n",
>>  		 desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask);
>> -- 
>> 2.35.1
>>