-/* Using SHA1 for now, define some constants.
- */
-#define COOKIE_DIGEST_WORDS (SHA_DIGEST_WORDS)
-#define COOKIE_MESSAGE_WORDS (SHA_MESSAGE_BYTES / 4)
-#define COOKIE_WORKSPACE_WORDS (COOKIE_DIGEST_WORDS + COOKIE_MESSAGE_WORDS)
-
-extern int tcp_cookie_generator(u32 *bakery);
-
-/**
- * struct tcp_cookie_values - each socket needs extra space for the
- * cookies, together with (optional) space for any SYN data.
- *
- * A tcp_sock contains a pointer to the current value, and this is
- * cloned to the tcp_timewait_sock.
- *
- * @cookie_pair: variable data from the option exchange.
- *
- * @cookie_desired: user specified tcpct_cookie_desired. Zero
- * indicates default (sysctl_tcp_cookie_size).
- * After cookie sent, remembers size of cookie.
- * Range 0, TCP_COOKIE_MIN to TCP_COOKIE_MAX.
- *
- * @s_data_desired: user specified tcpct_s_data_desired. When the
- * constant payload is specified (@s_data_constant),
- * holds its length instead.
- * Range 0 to TCP_MSS_DESIRED.
- *
- * @s_data_payload: constant data that is to be included in the
- * payload of SYN or SYNACK segments when the
- * cookie option is present.
- */
-struct tcp_cookie_values {
- struct kref kref;
- u8 cookie_pair[TCP_COOKIE_PAIR_SIZE];
- u8 cookie_pair_size;
- u8 cookie_desired;
- u16 s_data_desired:11,
- s_data_constant:1,
- s_data_in:1,
- s_data_out:1,
- s_data_unused:2;
- u8 s_data_payload[0];
-};
-
-static inline void tcp_cookie_values_release(struct kref *kref)
-{
- kfree(container_of(kref, struct tcp_cookie_values, kref));
-}
-
-/* The length of constant payload data. Note that s_data_desired is
- * overloaded, depending on s_data_constant: either the length of constant
- * data (returned here) or the limit on variable data.
- */
-static inline int tcp_s_data_size(const struct tcp_sock *tp)
-{
- return (tp->cookie_values != NULL && tp->cookie_values->s_data_constant)
- ? tp->cookie_values->s_data_desired
- : 0;
-}
-
-/**
- * struct tcp_extend_values - tcp_ipv?.c to tcp_output.c workspace.
- *
- * As tcp_request_sock has already been extended in other places, the
- * only remaining method is to pass stack values along as function
- * parameters. These parameters are not needed after sending SYNACK.
- *
- * @cookie_bakery: cryptographic secret and message workspace.
- *
- * @cookie_plus: bytes in authenticator/cookie option, copied from
- * struct tcp_options_received (above).
- */
-struct tcp_extend_values {
- struct request_values rv;
- u32 cookie_bakery[COOKIE_WORKSPACE_WORDS];
- u8 cookie_plus:6,
- cookie_out_never:1,
- cookie_in_always:1;
-};
-
-static inline struct tcp_extend_values *tcp_xv(struct request_values *rvp)
-{
- return (struct tcp_extend_values *)rvp;
-}
-