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| author | Florian Westphal <fw@strlen.de> | 2016-12-01 11:32:06 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-02 12:49:59 -0500 |
| commit | 95a22caee396cef0bb2ca8fafdd82966a49367bb (patch) | |
| tree | ba58ca9c85a73dc887096d8123d199b3d28a705c /include/net/secure_seq.h | |
| parent | 7df5358d4707c6f0a26266d3a4dd97fd353947e2 (diff) | |
| download | linux-95a22caee396cef0bb2ca8fafdd82966a49367bb.tar.gz linux-95a22caee396cef0bb2ca8fafdd82966a49367bb.tar.bz2 linux-95a22caee396cef0bb2ca8fafdd82966a49367bb.zip | |
tcp: randomize tcp timestamp offsets for each connection
jiffies based timestamps allow for easy inference of number of devices
behind NAT translators and also makes tracking of hosts simpler.
commit ceaa1fef65a7c2e ("tcp: adding a per-socket timestamp offset")
added the main infrastructure that is needed for per-connection ts
randomization, in particular writing/reading the on-wire tcp header
format takes the offset into account so rest of stack can use normal
tcp_time_stamp (jiffies).
So only two items are left:
- add a tsoffset for request sockets
- extend the tcp isn generator to also return another 32bit number
in addition to the ISN.
Re-use of ISN generator also means timestamps are still monotonically
increasing for same connection quadruple, i.e. PAWS will still work.
Includes fixes from Eric Dumazet.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/secure_seq.h')
| -rw-r--r-- | include/net/secure_seq.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/net/secure_seq.h b/include/net/secure_seq.h index 3f36d45b714a..0caee631a836 100644 --- a/include/net/secure_seq.h +++ b/include/net/secure_seq.h @@ -6,10 +6,10 @@ u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport); u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr, __be16 dport); -__u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, - __be16 sport, __be16 dport); -__u32 secure_tcpv6_sequence_number(const __be32 *saddr, const __be32 *daddr, - __be16 sport, __be16 dport); +u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, + __be16 sport, __be16 dport, u32 *tsoff); +u32 secure_tcpv6_sequence_number(const __be32 *saddr, const __be32 *daddr, + __be16 sport, __be16 dport, u32 *tsoff); u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport); u64 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr, |