diff options
| author | Lorenz Bauer | 2019-03-22 02:54:01 +0100 |
|---|---|---|
| committer | Alexei Starovoitov | 2019-03-22 02:59:10 +0100 |
| commit | edbf8c01de5a104a71ed6df2bf6421ceb2836a8e (patch) | |
| tree | 5e603fa0b5f6f5a02f846d68c34050e1aafb4642 /include/uapi/linux/bpf.h | |
| parent | bpf: allow helpers to return PTR_TO_SOCK_COMMON (diff) | |
| download | kernel-qcow2-linux-edbf8c01de5a104a71ed6df2bf6421ceb2836a8e.tar.gz kernel-qcow2-linux-edbf8c01de5a104a71ed6df2bf6421ceb2836a8e.tar.xz kernel-qcow2-linux-edbf8c01de5a104a71ed6df2bf6421ceb2836a8e.zip | |
bpf: add skc_lookup_tcp helper
Allow looking up a sock_common. This gives eBPF programs
access to timewait and request sockets.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/uapi/linux/bpf.h')
| -rw-r--r-- | include/uapi/linux/bpf.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 929c8e537a14..fab05317f5e7 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -2431,6 +2431,23 @@ union bpf_attr { * Return * A **struct bpf_sock** pointer on success, or **NULL** in * case of failure. + * + * struct bpf_sock *bpf_skc_lookup_tcp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags) + * Description + * Look for TCP socket matching *tuple*, optionally in a child + * network namespace *netns*. The return value must be checked, + * and if non-**NULL**, released via **bpf_sk_release**\ (). + * + * This function is identical to bpf_sk_lookup_tcp, except that it + * also returns timewait or request sockets. Use bpf_sk_fullsock + * or bpf_tcp_socket to access the full structure. + * + * This helper is available only if the kernel was compiled with + * **CONFIG_NET** configuration option. + * Return + * Pointer to **struct bpf_sock**, or **NULL** in case of failure. + * For sockets with reuseport option, the **struct bpf_sock** + * result is from **reuse->socks**\ [] using the hash of the tuple. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -2531,7 +2548,8 @@ union bpf_attr { FN(sk_fullsock), \ FN(tcp_sock), \ FN(skb_ecn_set_ce), \ - FN(get_listener_sock), + FN(get_listener_sock), \ + FN(skc_lookup_tcp), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call |