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Commit c4365c92 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[RANDOM]: Introduce secure_dccp_sequence_number 



Code contributed by Stephen Hemminger.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d8c97a94

drivers/char/random.c

+34 −0
Original line number Diff line number Diff line
@@ -1589,6 +1589,40 @@ u32 secure_tcpv6_port_ephemeral(const __u32 *saddr, const __u32 *daddr, __u16 dp 
EXPORT_SYMBOL(secure_tcpv6_port_ephemeral);

#endif



#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)

/* Similar to secure_tcp_sequence_number but generate a 48 bit value

 * bit's 32-47 increase every key exchange

 *       0-31  hash(source, dest)

 */

u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,

				__u16 sport, __u16 dport)

{

	struct timeval tv;

	u64 seq;

	__u32 hash[4];

	struct keydata *keyptr = get_keyptr();



	hash[0] = saddr;

	hash[1] = daddr;

	hash[2] = (sport << 16) + dport;

	hash[3] = keyptr->secret[11];



	seq = half_md4_transform(hash, keyptr->secret);

	seq |= ((u64)keyptr->count) << (32 - HASH_BITS);



	do_gettimeofday(&tv);

	seq += tv.tv_usec + tv.tv_sec * 1000000;

	seq &= (1ull << 48) - 1;

#if 0

	printk("dccp init_seq(%lx, %lx, %d, %d) = %d\n",

	       saddr, daddr, sport, dport, seq);

#endif

	return seq;

}



EXPORT_SYMBOL(secure_dccp_sequence_number);

#endif



#endif /* CONFIG_INET */

include/linux/random.h

+2 −0
Original line number Diff line number Diff line
@@ -59,6 +59,8 @@ extern __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr, 
					__u16 sport, __u16 dport);

extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,

					  __u16 sport, __u16 dport);

extern u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,

				       __u16 sport, __u16 dport);



#ifndef MODULE

extern struct file_operations random_fops, urandom_fops;