netdev - Re: [net-next v2] ipv6: sr: extract the right key values for "seg6_make

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Message-Id: <20180430.121357.2257158218189689071.davem@davemloft.net>
Date:   Mon, 30 Apr 2018 12:13:57 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     amsalam20@...il.com
Cc:     dav.lebrun@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next v2] ipv6: sr: extract the right key values for
 "seg6_make_flowlabel"

From: Ahmed Abdelsalam <amsalam20@...il.com>
Date: Sat, 28 Apr 2018 12:18:35 +0200

> The seg6_make_flowlabel() is used by seg6_do_srh_encap() to compute the
> flowlabel from a given skb. It relies on skb_get_hash() which eventually
> calls __skb_flow_dissect() to extract the flow_keys struct values from
> the skb.
> 
> In case of IPv4 traffic, calling seg6_make_flowlabel() after skb_push(),
> skb_reset_network_header(), and skb_mac_header_rebuild() will results in
> flow_keys struct of all key values set to zero.
> 
> This patch calls seg6_make_flowlabel() before resetting the headers of skb
> to get the right key values.
> 
> Extracted Key values are based on the type inner packet as follows:
> 1) IPv6 traffic: src_IP, dst_IP, L4 proto, and flowlabel of inner packet.
> 2) IPv4 traffic: src_IP, dst_IP, L4 proto, src_port, and dst_port
> 3) L2 traffic: depends on what kind of traffic carried into the L2
> frame. IPv6 and IPv4 traffic works as discussed 1) and 2)
> 
> Here a hex_dump of struct flow_keys for IPv4 and IPv6 traffic
> 10.100.1.100: 47302 > 30.0.0.2: 5001
> 00000000: 14 00 02 00 00 00 00 00 08 00 11 00 00 00 00 00
> 00000010: 00 00 00 00 00 00 00 00 13 89 b8 c6 1e 00 00 02
> 00000020: 0a 64 01 64
> 
> fc00:a1:a > b2::2
> 00000000: 28 00 03 00 00 00 00 00 86 dd 11 00 99 f9 02 00
> 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 b2 00 00
> 00000020: 00 00 00 00 00 00 00 00 00 00 00 02 fc 00 00 a1
> 00000030: 00 00 00 00 00 00 00 00 00 00 00 0a
> 
> Signed-off-by: Ahmed Abdelsalam <amsalam20@...il.com>

Looks good, applied, thank you.