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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-11-13 21:12:14 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-11-13 21:12:14 -0800 |
| commit | 6dd10a62353a50b30b30e0c18653650975b29c71 (patch) | |
| tree | 1410482f86ec88a4f65692c4dd301eae5696a762 /drivers/char | |
| parent | cb4da1a34de3840ce49dc7292a063e1ef7f127af (diff) | |
| download | linux-6dd10a62353a50b30b30e0c18653650975b29c71.tar.gz linux-6dd10a62353a50b30b30e0c18653650975b29c71.tar.bz2 linux-6dd10a62353a50b30b30e0c18653650975b29c71.zip | |
[NET] random : secure_tcp_sequence_number should not assume CONFIG_KTIME_SCALAR
All 32 bits machines but i386 dont have CONFIG_KTIME_SCALAR. On these
machines, ktime.tv64 is more than 4 times the (correct) result given
by ktime_to_ns()
Again on these machines, using ktime_get_real().tv64 >> 6 give a
32bits rollover every 64 seconds, which is not wanted (less than the
120 s MSL)
Using ktime_to_ns() is the portable way to get nsecs from a ktime, and
have correct code.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/random.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 1756b1f7cb72..5fee05661823 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1494,7 +1494,7 @@ __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr, seq = twothirdsMD4Transform((const __u32 *)daddr, hash) & HASH_MASK; seq += keyptr->count; - seq += ktime_get_real().tv64; + seq += ktime_to_ns(ktime_get_real()); return seq; } @@ -1556,7 +1556,7 @@ __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, * overlaps less than one time per MSL (2 minutes). * Choosing a clock of 64 ns period is OK. (period of 274 s) */ - seq += ktime_get_real().tv64 >> 6; + seq += ktime_to_ns(ktime_get_real()) >> 6; #if 0 printk("init_seq(%lx, %lx, %d, %d) = %d\n", saddr, daddr, sport, dport, seq); @@ -1616,7 +1616,7 @@ u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, seq = half_md4_transform(hash, keyptr->secret); seq |= ((u64)keyptr->count) << (32 - HASH_BITS); - seq += ktime_get_real().tv64; + seq += ktime_to_ns(ktime_get_real()); seq &= (1ull << 48) - 1; #if 0 printk("dccp init_seq(%lx, %lx, %d, %d) = %d\n", |