netdev - Re: [PATCH bpf 1/2] bpf_redirect_neigh: Support supplying the nexthop as a helper parameter

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Date:   Mon, 19 Oct 2020 21:08:04 -0600
From:   David Ahern <dsahern@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf 1/2] bpf_redirect_neigh: Support supplying the nexthop
 as a helper parameter

On 10/19/20 10:04 AM, Toke Høiland-Jørgensen wrote:
> @@ -4906,6 +4910,16 @@ struct bpf_fib_lookup {
>  	__u8	dmac[6];     /* ETH_ALEN */
>  };
>  
> +struct bpf_redir_neigh {
> +	/* network family for lookup (AF_INET, AF_INET6) */
> +	__u8	nh_family;

Define every byte. This is a 3-byte hole that should have unused's and
the helper verifies they are set to 0.

> +	/* network address of nexthop; skips fib lookup to find gateway */
> +	union {
> +		__be32		ipv4_nh;
> +		__u32		ipv6_nh[4];  /* in6_addr; network order */
> +	};
> +};
> +
>  enum bpf_task_fd_type {
>  	BPF_FD_TYPE_RAW_TRACEPOINT,	/* tp name */
>  	BPF_FD_TYPE_TRACEPOINT,		/* tp name */