[RANDOM]: Introduce secure_dccp_sequence_number
Code contributed by Stephen Hemminger. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1589,6 +1589,40 @@ u32 secure_tcpv6_port_ephemeral(const __u32 *saddr, const __u32 *daddr, __u16 dp
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EXPORT_SYMBOL(secure_tcpv6_port_ephemeral);
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EXPORT_SYMBOL(secure_tcpv6_port_ephemeral);
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#endif
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#endif
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#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
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/* Similar to secure_tcp_sequence_number but generate a 48 bit value
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* bit's 32-47 increase every key exchange
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* 0-31 hash(source, dest)
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*/
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u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,
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__u16 sport, __u16 dport)
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{
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struct timeval tv;
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u64 seq;
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__u32 hash[4];
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struct keydata *keyptr = get_keyptr();
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hash[0] = saddr;
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hash[1] = daddr;
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hash[2] = (sport << 16) + dport;
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hash[3] = keyptr->secret[11];
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seq = half_md4_transform(hash, keyptr->secret);
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seq |= ((u64)keyptr->count) << (32 - HASH_BITS);
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do_gettimeofday(&tv);
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seq += tv.tv_usec + tv.tv_sec * 1000000;
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seq &= (1ull << 48) - 1;
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#if 0
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printk("dccp init_seq(%lx, %lx, %d, %d) = %d\n",
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saddr, daddr, sport, dport, seq);
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#endif
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return seq;
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}
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EXPORT_SYMBOL(secure_dccp_sequence_number);
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#endif
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#endif /* CONFIG_INET */
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#endif /* CONFIG_INET */
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@ -59,6 +59,8 @@ extern __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr,
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__u16 sport, __u16 dport);
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__u16 sport, __u16 dport);
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extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,
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extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,
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__u16 sport, __u16 dport);
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__u16 sport, __u16 dport);
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extern u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,
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__u16 sport, __u16 dport);
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#ifndef MODULE
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#ifndef MODULE
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extern struct file_operations random_fops, urandom_fops;
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extern struct file_operations random_fops, urandom_fops;
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