netdev - Re: [PATCH v2 1/1] net: geneve: accept every ethertype

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Date:   Mon, 27 Feb 2023 10:02:23 +0000
From:   "Josef Miegl" <josef@...gl.cz>
To:     "Eyal Birger" <eyal.birger@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        "Jakub Kicinski" <kuba@...nel.org>,
        "Paolo Abeni" <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] net: geneve: accept every ethertype

February 27, 2023 10:31 AM, "Eyal Birger" <eyal.birger@...il.com> wrote:

> On Mon, Feb 27, 2023 at 10:14 AM Josef Miegl <josef@...gl.cz> wrote:
> 
>> This patch removes a restriction that prohibited receiving encapsulated
>> ethertypes other than IPv4, IPv6 and Ethernet.
>> 
>> With IFLA_GENEVE_INNER_PROTO_INHERIT flag set, GENEVE interface can now
>> receive ethertypes such as MPLS.
>> 
>> Signed-off-by: Josef Miegl <josef@...gl.cz>
>> ---
>> drivers/net/geneve.c | 15 ++++-----------
>> 1 file changed, 4 insertions(+), 11 deletions(-)
>> 
>> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
>> index 89ff7f8e8c7e..7973659a891f 100644
>> --- a/drivers/net/geneve.c
>> +++ b/drivers/net/geneve.c
>> @@ -353,7 +353,6 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
>> struct genevehdr *geneveh;
>> struct geneve_dev *geneve;
>> struct geneve_sock *gs;
>> - __be16 inner_proto;
> 
> nit: why remove the variable? - it's still used in two places and this
> change just makes the patch longer.

I thought making the code shorter would be a better option, usage in two
places doesn't justify a dedicated variable in my mind.

>> int opts_len;
>> 
>> /* Need UDP and Geneve header to be present */
>> @@ -365,13 +364,6 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
>> if (unlikely(geneveh->ver != GENEVE_VER))
>> goto drop;
>> 
>> - inner_proto = geneveh->proto_type;
>> -
>> - if (unlikely((inner_proto != htons(ETH_P_TEB) &&
>> - inner_proto != htons(ETH_P_IP) &&
>> - inner_proto != htons(ETH_P_IPV6))))
>> - goto drop;
>> -
>> gs = rcu_dereference_sk_user_data(sk);
>> if (!gs)
>> goto drop;
>> @@ -381,14 +373,15 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
>> goto drop;
>> 
>> if (unlikely((!geneve->cfg.inner_proto_inherit &&
>> - inner_proto != htons(ETH_P_TEB)))) {
>> + geneveh->proto_type != htons(ETH_P_TEB)))) {
>> geneve->dev->stats.rx_dropped++;
>> goto drop;
>> }
>> 
>> opts_len = geneveh->opt_len * 4;
>> - if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
>> - !net_eq(geneve->net, dev_net(geneve->dev)))) {
>> + if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
>> + geneveh->proto_type, !net_eq(geneve->net,
>> + dev_net(geneve->dev)))) {
>> geneve->dev->stats.rx_dropped++;
>> goto drop;
>> }
>> --
>> 2.37.1