diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/random.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 6b11d6b2129f..7999da25fe40 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -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 */ |