linux/net/ipv4/tcp_timer.c, branch v4.5

ipv4: Namespecify the tcp_keepalive_intvl sysctl knob

2016-01-10T22:32:09Z

This is the final part required to namespaceify the tcp keep alive mechanism. Signed-off-by: Nikolay Borisov Signed-off-by: David S. Miller

ipv4: Namespecify tcp_keepalive_probes sysctl knob

2016-01-10T22:32:09Z

This is required to have full tcp keepalive mechanism namespace support. Signed-off-by: Nikolay Borisov Signed-off-by: David S. Miller

ipv4: Namespaceify tcp_keepalive_time sysctl knob

2016-01-10T22:32:09Z

Different net namespaces might have different requirements as to the keepalive time of tcp sockets. This might be required in cases where different firewall rules are in place which require tcp timeout sockets to be increased/decreased independently of the host. Signed-off-by: Nikolay Borisov Signed-off-by: David S. Miller

tcp: fix Fast Open snmp over-counting bug

2015-11-20T15:51:12Z

Fix incrementing TCPFastOpenActiveFailed snmp stats multiple times when the handshake experiences multiple SYN timeouts. Signed-off-by: Yuchung Cheng Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

tcp: disable Fast Open on timeouts after handshake

2015-11-20T15:51:12Z

Some middle-boxes black-hole the data after the Fast Open handshake (https://www.ietf.org/proceedings/94/slides/slides-94-tcpm-13.pdf). The exact reason is unknown. The work-around is to disable Fast Open temporarily after multiple recurring timeouts with few or no data delivered in the established state. Signed-off-by: Yuchung Cheng Signed-off-by: Eric Dumazet Reported-by: Christoph Paasch Signed-off-by: David S. Miller

tcp: change type of alive from int to bool

2015-10-12T12:15:03Z

The alive parameter of tcp_orphan_retries, indicates whether the connection is assumed alive or not. In the function and all places calling it is used as a boolean value. Therefore this changes the type of alive to bool in the function definition and all calling locations. Since tcp_orphan_tries is a tcp_timer.c local function no change in any other file or header is necessary. Signed-off-by: Richard Sailer Signed-off-by: David S. Miller

tcp: do not export tcp_init_xmit_timers()

2015-07-10T04:44:38Z

After commit 900f65d361d3 ("tcp: move duplicate code from tcp_v4_init_sock()/tcp_v6_init_sock()"), we no longer need to export tcp_init_xmit_timers() Signed-off-by: Eric Dumazet Cc: Neal Cardwell Acked-by: Neal Cardwell Signed-off-by: David S. Miller

tcp: introduce tcp_under_memory_pressure()

2015-05-18T02:45:48Z

Introduce an optimized version of sk_under_memory_pressure() for TCP. Our intent is to use it in fast paths. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

tcp: add TCPWinProbe and TCPKeepAlive SNMP counters

2015-05-09T20:42:32Z

Diagnosing problems related to Window Probes has been hard because we lack a counter. TCPWinProbe counts the number of ACK packets a sender has to send at regular intervals to make sure a reverse ACK packet opening back a window had not been lost. TCPKeepAlive counts the number of ACK packets sent to keep TCP flows alive (SO_KEEPALIVE) Signed-off-by: Eric Dumazet Signed-off-by: Yuchung Cheng Acked-by: Neal Cardwell Acked-by: Nandita Dukkipati Signed-off-by: David S. Miller

tcp: RFC7413 option support for Fast Open client

2015-04-07T22:36:39Z

Fast Open has been using an experimental option with a magic number (RFC6994). This patch makes the client by default use the RFC7413 option (34) to get and send Fast Open cookies. This patch makes the client solicit cookies from a given server first with the RFC7413 option. If that fails to elicit a cookie, then it tries the RFC6994 experimental option. If that also fails, it uses the RFC7413 option on all subsequent connect attempts. If the server returns a Fast Open cookie then the client caches the form of the option that successfully elicited a cookie, and uses that form on later connects when it presents that cookie. The idea is to gradually obsolete the use of experimental options as the servers and clients upgrade, while keeping the interoperability meanwhile. Signed-off-by: Daniel Lee Signed-off-by: Yuchung Cheng Signed-off-by: Neal Cardwell Signed-off-by: David S. Miller