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由 Eyal Birger 提交于
This commit introduces a helper which allows fetching xfrm state parameters by eBPF programs attached to TC. Prototype: bpf_skb_get_xfrm_state(skb, index, xfrm_state, size, flags) skb: pointer to skb index: the index in the skb xfrm_state secpath array xfrm_state: pointer to 'struct bpf_xfrm_state' size: size of 'struct bpf_xfrm_state' flags: reserved for future extensions The helper returns 0 on success. Non zero if no xfrm state at the index is found - or non exists at all. struct bpf_xfrm_state currently includes the SPI, peer IPv4/IPv6 address and the reqid; it can be further extended by adding elements to its end - indicating the populated fields by the 'size' argument - keeping backwards compatibility. Typical usage: struct bpf_xfrm_state x = {}; bpf_skb_get_xfrm_state(skb, 0, &x, sizeof(x), 0); ... Signed-off-by: NEyal Birger <eyal.birger@gmail.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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