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bpf: allow BPF programs access skb_shared_info->gso_segs field

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This adds the ability to read gso_segs from a BPF program.

v3: Use BPF_REG_AX instead of BPF_REG_TMP for the temporary register,
    as suggested by Martin.

v2: refined Eddie Hao patch to address Alexei feedback.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Eddie Hao <eddieh@google.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Eric Dumazet
2019-01-23 09:22:27 -08:00
committed by Daniel Borkmann
parent 866e6ac474
commit d9ff286a0f
4 changed files with 59 additions and 0 deletions
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1
include/uapi/linux/bpf.h
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@ -2540,6 +2540,7 @@ struct __sk_buff {
__bpf_md_ptr(struct bpf_flow_keys *, flow_keys);
__u64 tstamp;
__u32 wire_len;
__u32 gso_segs;
};
struct bpf_tunnel_key {