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bpf: support cloning sk storage on accept()

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Add new helper bpf_sk_storage_clone which optionally clones sk storage
and call it from sk_clone_lock.

Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev
2019-08-14 10:37:49 -07:00
committed by Daniel Borkmann
parent b0e4701ce1
commit 8f51dfc73b
4 changed files with 120 additions and 6 deletions
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3
include/uapi/linux/bpf.h
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@@ -337,6 +337,9 @@ enum bpf_attach_type {
#define BPF_F_RDONLY_PROG (1U << 7)
#define BPF_F_WRONLY_PROG (1U << 8)
/* Clone map from listener for newly accepted socket */
#define BPF_F_CLONE (1U << 9)
/* flags for BPF_PROG_QUERY */
#define BPF_F_QUERY_EFFECTIVE (1U << 0)