uapi/linux/bpf.h

1670 		__aligned_u64	cookie;
1745 				__u64		cookie;
2774  * 		retrieve the cookie (generated by the kernel) of this socket.
2775  * 		If no cookie has been set yet, generate a new cookie. Once
2776  * 		generated, the socket cookie remains stable for the life of the
3929  * 		Check whether *iph* and *th* contain a valid SYN cookie ACK for
3940  * 		0 if *iph* and *th* are a valid SYN cookie ACK, or a negative
4116  *		Try to issue a SYN cookie for the packet with corresponding
4127  *		On success, lower 32 bits hold the generated SYN cookie in
4128  *		followed by 16 bits which hold the MSS value for that cookie,
4133  *		**-EINVAL** SYN cookie cannot be issued due to error
4135  *		**-ENOENT** SYN cookie should not be issued (no SYN flood)
4315  * 		Retrieve the cookie (generated by the kernel) of the network
4317  * 		namespace cookie remains stable for its lifetime and provides
4319  * 		NULL, then the helper returns the cookie for the initial
4320  * 		network namespace. The cookie itself is very similar to that
5635  *		Try to issue a SYN cookie for the packet with corresponding
5645  *		On success, lower 32 bits hold the generated SYN cookie in
5646  *		followed by 16 bits which hold the MSS value for that cookie,
5655  *		Try to issue a SYN cookie for the packet with corresponding
5665  *		On success, lower 32 bits hold the generated SYN cookie in
5666  *		followed by 16 bits which hold the MSS value for that cookie,
5677  *		Check whether *iph* and *th* contain a valid SYN cookie ACK
5684  *		0 if *iph* and *th* are a valid SYN cookie ACK.
5688  *		**-EACCES** if the SYN cookie is not valid.
5692  *		Check whether *iph* and *th* contain a valid SYN cookie ACK
5699  *		0 if *iph* and *th* are a valid SYN cookie ACK.
5703  *		**-EACCES** if the SYN cookie is not valid.
6697 					__u64 cookie;
6705 					__u64 cookie;
6711 					__u64 cookie;
6717 					__u64 cookie;
7369 		__u64 cookie; /* Non-zero if socket was selected in PROG_TEST_RUN */