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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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9
net/core/sock.c
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@@ -1851,9 +1851,12 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
goto out;
}
RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
#ifdef CONFIG_BPF_SYSCALL
RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
#endif
if (bpf_sk_storage_clone(sk, newsk)) {
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
newsk->sk_err = 0;
newsk->sk_err_soft = 0;