diff options
| author | Florian Westphal <fw@strlen.de> | 2016-12-01 11:32:07 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-02 12:49:59 -0500 |
| commit | 25429d7b7dca01dc4f17205de023a30ca09390d0 (patch) | |
| tree | 6eafce74d841ccfa7dfb776e5cc1563424b1b2cf /net | |
| parent | 95a22caee396cef0bb2ca8fafdd82966a49367bb (diff) | |
| download | linux-25429d7b7dca01dc4f17205de023a30ca09390d0.tar.gz linux-25429d7b7dca01dc4f17205de023a30ca09390d0.tar.bz2 linux-25429d7b7dca01dc4f17205de023a30ca09390d0.zip | |
tcp: allow to turn tcp timestamp randomization off
Eric says: "By looking at tcpdump, and TS val of xmit packets of multiple
flows, we can deduct the relative qdisc delays (think of fq pacing).
This should work even if we have one flow per remote peer."
Having random per flow (or host) offsets doesn't allow that anymore so add
a way to turn this off.
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/secure_seq.c | 5 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 1 |
2 files changed, 4 insertions, 2 deletions
diff --git a/net/core/secure_seq.c b/net/core/secure_seq.c index a8d6062cbb4a..88a8e429fc3e 100644 --- a/net/core/secure_seq.c +++ b/net/core/secure_seq.c @@ -12,6 +12,7 @@ #include <net/secure_seq.h> #if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET) +#include <net/tcp.h> #define NET_SECRET_SIZE (MD5_MESSAGE_BYTES / 4) static u32 net_secret[NET_SECRET_SIZE] ____cacheline_aligned; @@ -58,7 +59,7 @@ u32 secure_tcpv6_sequence_number(const __be32 *saddr, const __be32 *daddr, md5_transform(hash, secret); - *tsoff = hash[1]; + *tsoff = sysctl_tcp_timestamps == 1 ? hash[1] : 0; return seq_scale(hash[0]); } EXPORT_SYMBOL(secure_tcpv6_sequence_number); @@ -100,7 +101,7 @@ u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, md5_transform(hash, net_secret); - *tsoff = hash[1]; + *tsoff = sysctl_tcp_timestamps == 1 ? hash[1] : 0; return seq_scale(hash[0]); } diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 2257de244622..fe668c1b9ced 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -85,6 +85,7 @@ int sysctl_tcp_dsack __read_mostly = 1; int sysctl_tcp_app_win __read_mostly = 31; int sysctl_tcp_adv_win_scale __read_mostly = 1; EXPORT_SYMBOL(sysctl_tcp_adv_win_scale); +EXPORT_SYMBOL(sysctl_tcp_timestamps); /* rfc5961 challenge ack rate limiting */ int sysctl_tcp_challenge_ack_limit = 1000; |