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bpf: export bpf_sock for BPF_PROG_TYPE_CGROUP_SOCK_ADDR 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_addr_kern) already has sk
member, so I just expose it to the BPF hooks. Using PTR_TO_SOCKET
instead of PTR_TO_SOCK_COMMON should be safe because the hook is
called on bind/connect.

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 10:30:37 -07:00 • committed by Daniel Borkmann
parent d30bd78ce8
commit fb85c4a730
2 changed files with 17 additions and 0 deletions
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include/uapi/linux/bpf.h
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@ -3247,6 +3247,7 @@ struct bpf_sock_addr {
__u32 msg_src_ip6[4]; /* Allows 1,2,4-byte read an 4-byte write.
* Stored in network byte order.
*/
__bpf_md_ptr(struct bpf_sock *, sk);
};
/* User bpf_sock_ops struct to access socket values and specify request ops