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tcp: remove tcp_tw_recycle

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The tcp_tw_recycle was already broken for connections
behind NAT, since the per-destination timestamp is not
monotonically increasing for multiple machines behind
a single destination address.

After the randomization of TCP timestamp offsets
in commit 8a5bd45f6616 (tcp: randomize tcp timestamp offsets
for each connection), the tcp_tw_recycle is broken for all
types of connections for the same reason: the timestamps
received from a single machine is not monotonically increasing,
anymore.

Remove tcp_tw_recycle, since it is not functional. Also, remove
the PAWSPassive SNMP counter since it is only used for
tcp_tw_recycle, and simplify tcp_v4_route_req and tcp_v6_route_req
since the strict argument is only set when tcp_tw_recycle is
enabled.

Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Neal Cardwell <[email protected]>
Signed-off-by: Yuchung Cheng <[email protected]>
Cc: Lutz Vieweg <[email protected]>
Cc: Florian Westphal <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Soheil Hassas Yeganeh 2017-03-15 16:30:46 -04:00 • committed by David S. Miller
commit 4396e46187
9 changed files with 9 additions and 59 deletions
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1
include/net/netns/ipv4.h
View file

@ -33,7 +33,6 @@ struct inet_timewait_death_row {
atomic_t tw_count;
struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp;
int sysctl_tw_recycle;
int sysctl_max_tw_buckets;
};

3
include/net/tcp.h
View file

@ -1810,8 +1810,7 @@ struct tcp_request_sock_ops {
__u16 *mss);
#endif
struct dst_entry *(*route_req)(const struct sock *sk, struct flowi *fl,
const struct request_sock *req,
bool *strict);
const struct request_sock *req);
__u32 (*init_seq_tsoff)(const struct sk_buff *skb, u32 *tsoff);
int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
struct flowi *fl, struct request_sock *req,