From 95a22caee396cef0bb2ca8fafdd82966a49367bb Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 1 Dec 2016 11:32:06 +0100 Subject: 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 Acked-by: Eric Dumazet Acked-by: Yuchung Cheng Signed-off-by: David S. Miller --- net/ipv6/syncookies.c | 1 + net/ipv6/tcp_ipv6.c | 10 ++++++---- 2 files changed, 7 insertions(+), 4 deletions(-) (limited to 'net/ipv6') diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 97830a6a9cbb..a4d49760bf43 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. diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 28ec0a2e7b72..a2185a214abc 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -101,12 +101,12 @@ static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) } } -static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) +static u32 tcp_v6_init_sequence(const struct sk_buff *skb, u32 *tsoff) { return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, ipv6_hdr(skb)->saddr.s6_addr32, tcp_hdr(skb)->dest, - tcp_hdr(skb)->source); + tcp_hdr(skb)->source, tsoff); } static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, @@ -283,7 +283,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, sk->sk_v6_daddr.s6_addr32, inet->inet_sport, - inet->inet_dport); + inet->inet_dport, + &tp->tsoffset); err = tcp_connect(sk); if (err) @@ -956,7 +957,8 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, - tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, + tcp_time_stamp + tcp_rsk(req)->ts_off, + req->ts_recent, sk->sk_bound_dev_if, tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0, 0); } -- cgit v1.2.3