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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-08-09 20:12:30 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:49:40 -0700
commitc4365c9235f80128c3c3d5993074173941b1c1f0 (patch)
treef507b8360bab9f4c86050d75bb7372aa28ce890e
parentd8c97a9451068dd9f7b838a240bb6db894133a5e (diff)
downloadlinux-linaro-c4365c9235f80128c3c3d5993074173941b1c1f0.tar.gz
[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>
-rw-r--r--drivers/char/random.c34
-rw-r--r--include/linux/random.h2
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 6b11d6b2129..7999da25fe4 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 */
diff --git a/include/linux/random.h b/include/linux/random.h
index cc670344991..7b2adb3322d 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -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;