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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 /net/ipv6/syncookies.c | |
parent | 7df5358d4707c6f0a26266d3a4dd97fd353947e2 (diff) | |
download | op-kernel-dev-95a22caee396cef0bb2ca8fafdd82966a49367bb.zip op-kernel-dev-95a22caee396cef0bb2ca8fafdd82966a49367bb.tar.gz |
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 'net/ipv6/syncookies.c')
-rw-r--r-- | net/ipv6/syncookies.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 97830a6..a4d4976 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -209,6 +209,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) treq->snt_synack.v64 = 0; treq->rcv_isn = ntohl(th->seq) - 1; treq->snt_isn = cookie; + treq->ts_off = 0; /* * We need to lookup the dst_entry to get the correct window size. |