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bpf: export bpf_sock for BPF_PROG_TYPE_SOCK_OPS prog type

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And let it use bpf_sk_storage_{get,delete} helpers to access socket
storage. Kernel context (struct bpf_sock_ops_kern) already has sk
member, so I just expose it to the BPF hooks. I use
PTR_TO_SOCKET_OR_NULL and return NULL in !is_fullsock case.

I also export bpf_tcp_sock to make it possible to access tcp socket stats.

Cc: Martin Lau <kafai@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 2019-06-12 10:30:38 -07:00 • committed by Daniel Borkmann
parent fb85c4a730
commit 1314ef5611
2 changed files with 27 additions and 0 deletions
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1
include/uapi/linux/bpf.h
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@ -3299,6 +3299,7 @@ struct bpf_sock_ops {
__u32 sk_txhash;
__u64 bytes_received;
__u64 bytes_acked;
__bpf_md_ptr(struct bpf_sock *, sk);
};
/* Definitions for bpf_sock_ops_cb_flags */