tools: update include/uapi/linux/bpf.h

 *	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.

 *

 * int bpf_tcp_check_syncookie(struct bpf_sock *sk, void *iph, u32 iph_len, struct tcphdr *th, u32 th_len)

 * 	Description

 * 		Check whether iph and th contain a valid SYN cookie ACK for

 * 		the listening socket in sk.

 *

 * 		iph points to the start of the IPv4 or IPv6 header, while

 * 		iph_len contains sizeof(struct iphdr) or sizeof(struct ip6hdr).

 *

 * 		th points to the start of the TCP header, while th_len contains

 * 		sizeof(struct tcphdr).

 *

 * 	Return

 * 		0 if iph and th are a valid SYN cookie ACK, or a negative error

 * 		otherwise.

 */

#define __BPF_FUNC_MAPPER(FN)		\

	FN(unspec),			\

	FN(sk_fullsock),		\

	FN(tcp_sock),			\

	FN(skb_ecn_set_ce),		\

	FN(get_listener_sock),

	FN(get_listener_sock),		\

	FN(skc_lookup_tcp),		\

	FN(tcp_check_syncookie),

/* integer value in 'imm' field of BPF_CALL instruction selects which helper

 * function eBPF program intends to call