linux-kernel - Re: [PATCH bpf-next v5 1/9] bpf: xfrm: Add bpf_xdp_get_xfrm

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Date:   Wed, 13 Dec 2023 16:02:24 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Daniel Xu <dxu@...uu.xyz>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, devel@...ux-ipsec.org, daniel@...earbox.net,
        davem@...emloft.net, edumazet@...gle.com,
        Herbert Xu <herbert@...dor.apana.org.au>, ast@...nel.org,
        john.fastabend@...il.com, kuba@...nel.org,
        steffen.klassert@...unet.com, pabeni@...hat.com, hawk@...nel.org,
        antony.antony@...unet.com, alexei.starovoitov@...il.com,
        yonghong.song@...ux.dev, eddyz87@...il.com, eyal.birger@...il.com
Subject: Re: [PATCH bpf-next v5 1/9] bpf: xfrm: Add bpf_xdp_get_xfrm_state()
 kfunc

On 12/11/23 12:20 PM, Daniel Xu wrote:
> +/* bpf_xfrm_state_opts - Options for XFRM state lookup helpers
> + *
> + * Members:
> + * @error      - Out parameter, set for any errors encountered
> + *		 Values:
> + *		   -EINVAL - netns_id is less than -1
> + *		   -EINVAL - opts__sz isn't BPF_XFRM_STATE_OPTS_SZ
> + *		   -ENONET - No network namespace found for netns_id
> + * @netns_id	- Specify the network namespace for lookup
> + *		 Values:
> + *		   BPF_F_CURRENT_NETNS (-1)
> + *		     Use namespace associated with ctx
> + *		   [0, S32_MAX]
> + *		     Network Namespace ID
> + * @mark	- XFRM mark to match on
> + * @daddr	- Destination address to match on
> + * @spi		- Security parameter index to match on
> + * @proto	- L3 protocol to match on
> + * @family	- L3 protocol family to match on
> + */
> +struct bpf_xfrm_state_opts {
> +	s32 error;
> +	s32 netns_id;
> +	u32 mark;
> +	xfrm_address_t daddr;
> +	__be32 spi;
> +	u8 proto;
> +	u16 family;
> +};
> +
> +enum {
> +	BPF_XFRM_STATE_OPTS_SZ = sizeof(struct bpf_xfrm_state_opts),

The bpf prog can use the bpf_core_type_size() to figure out the size also.