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TCPCT part 1b: generate Responder Cookie secret

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Define (missing) hash message size for SHA1.

Define hashing size constants specific to TCP cookies.

Add new function: tcp_cookie_generator().

Maintain global secret values for tcp_cookie_generator().

This is a significantly revised implementation of earlier (15-year-old)
Photuris [RFC-2522] code for the KA9Q cooperative multitasking platform.

Linux RCU technique appears to be well-suited to this application, though
neither of the circular queue items are freed.

These functions will also be used in subsequent patches that implement
additional features.

Signed-off-by: William.Allen.Simpson@gmail.com
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Allen Simpson
2009-12-02 18:12:09 +00:00
committed by David S. Miller
parent e6b4d11367
commit da5c78c826
3 changed files with 149 additions and 0 deletions
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8
include/net/tcp.h
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@ -1478,6 +1478,14 @@ struct tcp_request_sock_ops {
#endif
};
/* 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);
extern void tcp_v4_init(void);
extern void tcp_init(void);