netdev - Re: [PATCH bpf] bpf: Fix IPv6 dport byte order in bpf_sk_lookup

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Date:   Fri, 9 Nov 2018 08:40:35 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Andrey Ignatov <rdna@...com>, netdev@...r.kernel.org
Cc:     ast@...nel.org, joe@...d.net.nz, kernel-team@...com
Subject: Re: [PATCH bpf] bpf: Fix IPv6 dport byte order in bpf_sk_lookup_udp

On 11/07/2018 10:36 PM, Andrey Ignatov wrote:
> Lookup functions in sk_lookup have different expectations about byte
> order of provided arguments.
> 
> Specifically __inet_lookup, __udp4_lib_lookup and __udp6_lib_lookup
> expect dport to be in network byte order and do ntohs(dport) internally.
> 
> At the same time __inet6_lookup expects dport to be in host byte order
> and correspondingly name the argument hnum.
> 
> sk_lookup works correctly with __inet_lookup, __udp4_lib_lookup and
> __inet6_lookup with regard to dport. But in __udp6_lib_lookup case it
> uses host instead of expected network byte order. It makes result
> returned by bpf_sk_lookup_udp for IPv6 incorrect.
> 
> The patch fixes byte order of dport passed to __udp6_lib_lookup.
> 
> Originally sk_lookup properly handled UDPv6, but not TCPv6. 5ef0ae84f02a
> fixes TCPv6 but breaks UDPv6.
> 
> Fixes: 5ef0ae84f02a ("bpf: Fix IPv6 dport byte-order in bpf_sk_lookup")
> Signed-off-by: Andrey Ignatov <rdna@...com>

Applied to bpf, thanks Andrey!