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opnsense-src/sys/netinet
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Sepherosa Ziehau 425b763928 tcp: Don't prematurely drop receiving-only connections 
If the connection was persistent and receiving-only, several (12)
sporadic device insufficient buffers would cause the connection be
dropped prematurely:
Upon ENOBUFS in tcp_output() for an ACK, retransmission timer is
started.  No one will stop this retransmission timer for receiving-
only connection, so the retransmission timer promises to expire and
t_rxtshift is promised to be increased.  And t_rxtshift will not be
reset to 0, since no RTT measurement will be done for receiving-only
connection.  If this receiving-only connection lived long enough
(e.g. >350sec, given the RTO starts from 200ms), and it suffered 12
sporadic device insufficient buffers, i.e. t_rxtshift >= 12, this
receiving-only connection would be dropped prematurely by the
retransmission timer.

We now assert that for data segments, SYNs or FINs either rexmit or
persist timer was wired upon ENOBUFS.  And don't set rexmit timer
for other cases, i.e. ENOBUFS upon ACKs.

Discussed with:	lstewart, hiren, jtl, Mike Karels
MFC after:	3 weeks
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D5872
2016-05-30 03:31:37 +00:00
..
cc Add an option to use rfc6675 based pipe/inflight bytes calculation in htcp. 2016-05-09 19:19:03 +00:00
khelp The TCP PAWS fix for kernels with fast tick rates (r231767) changed the TCP 2012-08-17 01:49:51 +00:00
libalias sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
tcp_stacks This small change adopts the excellent suggestion for using named 2016-05-17 09:53:22 +00:00
accf_data.c
accf_dns.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
accf_http.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
icmp6.h Implement Enhanced DAD algorithm for IPv6 described in 2015-03-02 17:30:26 +00:00
icmp_var.h Remove more constants related to static sysctl nodes. The MAXID constants 2014-02-25 18:44:33 +00:00
if_atm.c The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare 2013-10-26 17:58:36 +00:00
if_atm.h Add const qualifier to the dst parameter of the ifnet if_output method. 2013-04-26 12:50:32 +00:00
if_ether.c netinet: for pointers replace 0 with NULL. 2016-04-15 15:46:41 +00:00
if_ether.h Implement interface link header precomputation API. 2015-12-31 05:03:27 +00:00
igmp.c sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
igmp.h
igmp_var.h - Rename 'struct igmp_ifinfo' into 'struct igmp_ifsoftc', since it really 2015-02-19 22:35:23 +00:00
in.c in_lltable_alloc and in6 copy: Don't leak LLE in error path 2016-04-26 23:13:48 +00:00
in.h Provide functions to determine presence of a given address 2015-04-17 11:57:06 +00:00
in_cksum.c nobody uses this file except the userspace ipfw code, but the cast 2012-07-31 08:04:49 +00:00
in_debug.c
in_fib.c MFP r287070,r287073: split radix implementation and route table structure. 2016-01-25 06:33:15 +00:00
in_fib.h Merge helper fib* functions used for basic lookups. 2015-12-08 10:50:03 +00:00
in_gif.c Merge helper fib* functions used for basic lookups. 2015-12-08 10:50:03 +00:00
in_kdtrace.c Fix style issues around existing SDT probes. 2015-12-16 23:39:27 +00:00
in_kdtrace.h Fix style issues around existing SDT probes. 2015-12-16 23:39:27 +00:00
in_mcast.c sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
in_pcb.c FreeBSD previously provided route caching for TCP (and UDP). Re-add 2016-03-24 07:54:56 +00:00
in_pcb.h sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
in_pcbgroup.c Unbreak the RSS/PCBGROUp build. 2016-03-31 00:53:23 +00:00
in_proto.c kernel: use our nitems() macro when it is available through param.h. 2016-04-19 23:48:27 +00:00
in_rmx.c Code duplication but rib_head is special. Not found an easy way to go 2016-02-03 21:56:51 +00:00
in_rss.c Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_rss.h Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_systm.h Where appropriate, use the modern terms for the one true time base 2014-12-21 05:07:11 +00:00
in_var.h MFP r287070,r287073: split radix implementation and route table structure. 2016-01-25 06:33:15 +00:00
ip.h sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
ip6.h Eliminate use of M_EXT in IP6_EXTHDR_CHECK() by trimming a redundant 2014-10-05 06:28:53 +00:00
ip_carp.c Revert r292275 & r292379 2015-12-17 14:41:30 +00:00
ip_carp.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
ip_divert.c ipdivert: Remove unnecessary and incorrectly typed variable. 2016-04-28 02:46:08 +00:00
ip_divert.h
ip_dummynet.h Import Dummynet AQM version 0.2.1 (CoDel, FQ-CoDel, PIE and FQ-PIE). 2016-05-26 21:40:13 +00:00
ip_ecn.c
ip_ecn.h Remove unneded #include "opt_inet.h". 2015-07-31 09:02:28 +00:00
ip_encap.c Remove sys/eventhandler.h from net/route.h 2016-01-09 09:34:39 +00:00
ip_encap.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
ip_fastfwd.c sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
ip_fw.h Make named objects set-aware. Now it is possible to create named 2016-05-17 07:47:23 +00:00
ip_gre.c o Use new function ip_fillid() in all places throughout the kernel, 2015-04-01 22:26:39 +00:00
ip_icmp.c When sending in ICMP response to an SCTP packet, 2016-05-25 22:16:11 +00:00
ip_icmp.h Add support for handling ICMP and ICMP6 messages sent in response 2016-04-29 20:22:01 +00:00
ip_id.c Provide a comment explaining issues with the counter(9) trick, so that 2015-04-02 14:22:59 +00:00
ip_input.c Do not overwrite the dchg variable. 2016-04-14 18:57:30 +00:00
ip_ipsec.c Set the proper direction to check for policies in this one case. 2015-10-29 21:26:32 +00:00
ip_ipsec.h Remove flag/flags argument from the following functions: 2014-12-11 18:35:34 +00:00
ip_mroute.c netinet: for pointers replace 0 with NULL. 2016-04-15 15:46:41 +00:00
ip_mroute.h Migrate structs arpstat, icmpstat, mrtstat, pimstat and udpstat to PCPU 2013-07-09 09:50:15 +00:00
ip_options.c sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
ip_options.h Make net.inet.ip.sourceroute, net.inet.ip.accept_sourceroute, and 2014-09-15 07:20:40 +00:00
ip_output.c Plug route reference underleak that happens with FLOWTABLE after r297225. 2016-05-27 17:31:02 +00:00
ip_reass.c Fix RSS build - netisr input / NETISR_IP_DIRECT is used here. 2015-04-15 00:57:21 +00:00
ip_var.h MFp4 @180887: 2016-01-22 18:22:03 +00:00
pim.h
pim_var.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
raw_ip.c Send an ICMP packet indicating destination unreachable/protocol 2016-05-25 15:54:21 +00:00
sctp.h This is work done by Michael Tuexen and myself at the IETF. This 2016-04-07 09:10:34 +00:00
sctp_asconf.c Add the UDP encaps port as a parameter to sctp_add_remote_addr(). 2016-04-30 14:25:00 +00:00
sctp_asconf.h
sctp_auth.c Use __func__ instead of __FUNCTION__. 2015-10-19 11:17:54 +00:00
sctp_auth.h Use a consistent type for the number of HMAC algorithms. 2014-09-16 14:20:33 +00:00
sctp_bsd_addr.c netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_bsd_addr.h
sctp_cc_functions.c netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_constants.h netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_crc32.c
sctp_crc32.h
sctp_dtrace_declare.h - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
sctp_dtrace_define.h This is work done by Michael Tuexen and myself at the IETF. This 2016-04-07 09:10:34 +00:00
sctp_header.h Don't use anonymous unions. 2016-04-18 06:38:53 +00:00
sctp_indata.c Fix a locking bug which only shows up on Mac OS X. 2016-05-14 13:44:49 +00:00
sctp_indata.h A couple of minor changes that I missed that Michael had done, most noted 2016-04-07 09:34:41 +00:00
sctp_input.c netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_input.h Add FIB support for SCTP. 2015-06-17 15:20:14 +00:00
sctp_lock_bsd.h netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_os.h
sctp_os_bsd.h A couple of minor changes that I missed that Michael had done, most noted 2016-04-07 09:34:41 +00:00
sctp_output.c netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_output.h Don't allow a remote encapsulation port change during the 2016-01-30 12:58:38 +00:00
sctp_pcb.c netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_pcb.h netinet/sctp*: minor spelling fixes in comments. 2016-05-02 20:56:11 +00:00
sctp_peeloff.c Add a SCTP socket option to limit the cwnd for each path. 2015-03-10 19:49:25 +00:00
sctp_peeloff.h Remove unused function. 2012-11-25 14:25:08 +00:00
sctp_ss_functions.c Add const to several constants. Thanks to Nicholas Nethercote for 2016-03-23 13:28:04 +00:00
sctp_structs.h Fix a bug introduced by the implementation of I-DATA support. 2016-05-13 09:11:41 +00:00
sctp_syscalls.c netinet: for pointers replace 0 with NULL. 2016-04-15 15:46:41 +00:00
sctp_sysctl.c Retire net.inet.sctp.strict_sacks and net.inet.sctp.strict_data_order 2016-05-12 16:34:59 +00:00
sctp_sysctl.h Retire net.inet.sctp.strict_sacks and net.inet.sctp.strict_data_order 2016-05-12 16:34:59 +00:00
sctp_timer.c Cleanup a comment. 2016-05-09 16:35:05 +00:00
sctp_timer.h Code cleanup which will silence a warning in PVS / D5245. 2016-02-17 18:04:22 +00:00
sctp_uio.h Make struct sctp_paddrthlds compliant to RFC 7829. 2016-05-26 11:38:26 +00:00
sctp_usrreq.c Make struct sctp_paddrthlds compliant to RFC 7829. 2016-05-26 11:38:26 +00:00
sctp_var.h Fix the ICMP6 handling for SCTP. 2016-04-16 21:34:49 +00:00
sctputil.c Fix a bug introduced by the implementation of I-DATA support. 2016-05-13 09:11:41 +00:00
sctputil.h Remove a function, which is not used anymore. 2016-04-23 09:15:58 +00:00
siftr.c Use SI_SUB_LAST instead of SI_SUB_SMP as the "catch-all" subsystem. 2016-03-11 23:18:06 +00:00
tcp.h Provide new socket option TCP_CCALGOOPT, which stands for TCP congestion 2016-01-22 02:07:48 +00:00
tcp_debug.c Switch the entire IPv4 stack to keep the IP packet header 2012-10-22 21:09:03 +00:00
tcp_debug.h
tcp_fastopen.c Mfp: r296259 2016-04-09 10:58:08 +00:00
tcp_fastopen.h Implementation of server-side TCP Fast Open (TFO) [RFC7413]. 2015-12-24 19:09:48 +00:00
tcp_fsm.h
tcp_hostcache.c Clean up unused bandwidth entry in the TCP hostcache. 2015-12-11 06:22:58 +00:00
tcp_hostcache.h Clean up unused bandwidth entry in the TCP hostcache. 2015-12-11 06:22:58 +00:00
tcp_input.c Change net.inet.tcp.ecn.enable sysctl mib from a binary off/on 2016-05-19 22:20:35 +00:00
tcp_lro.c Use optimised complexity safe sorting routine instead of the kernel's 2016-05-26 11:10:31 +00:00
tcp_lro.h Use optimised complexity safe sorting routine instead of the kernel's 2016-05-26 11:10:31 +00:00
tcp_offload.c Augment struct tcpstat with tcps_states[], which is used for book-keeping 2016-01-27 00:45:46 +00:00
tcp_offload.h
tcp_output.c tcp: Don't prematurely drop receiving-only connections 2016-05-30 03:31:37 +00:00
tcp_pcap.c Garbage collect unused arguments of m_init(). 2016-02-10 18:54:18 +00:00
tcp_pcap.h There are times when it would be really nice to have a record of the last few 2015-10-14 00:35:37 +00:00
tcp_reass.c Remove sys/eventhandler.h from net/route.h 2016-01-09 09:34:39 +00:00
tcp_sack.c sys/net*: minor spelling fixes. 2016-05-03 18:05:43 +00:00
tcp_seq.h
tcp_subr.c Don't reuse the source mbuf in tcp_respond() if it is not writable. 2016-05-26 18:35:37 +00:00
tcp_syncache.c tcp/syncache: Add comment for syncache_respond 2016-05-10 04:59:04 +00:00
tcp_syncache.h Grab a snap amount of TCP connections in syncache from tcpstat. 2016-01-27 00:48:05 +00:00
tcp_timer.c This small change adopts the excellent suggestion for using named 2016-05-17 09:53:22 +00:00
tcp_timer.h This cleans up the timers code in TCP to start using the new 2016-04-28 13:27:12 +00:00
tcp_timewait.c Redo r294869. The array of counters for TCP states doesn't belong to 2016-03-15 00:15:10 +00:00
tcp_usrreq.c tcp_usrreq: Free allocated buffer in relock case 2016-04-26 23:02:18 +00:00
tcp_var.h Tiny refactor of r294869/r296881: use defines to mask the VNET() macro. 2016-05-17 23:14:17 +00:00
tcpip.h
toecore.c These files were getting sys/malloc.h and vm/uma.h with header pollution 2016-02-01 17:41:21 +00:00
toecore.h * Convert TOE framework to use new routing api. 2014-10-25 18:25:00 +00:00
udp.h Add placeholder constants to reserve a portion of the socket option 2013-02-01 15:32:20 +00:00
udp_usrreq.c Complete the UDP tunneling of ICMP msgs to those protocols 2016-04-28 15:53:10 +00:00
udp_var.h Complete the UDP tunneling of ICMP msgs to those protocols 2016-04-28 15:53:10 +00:00
udplite.h Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks. 2014-04-07 01:53:03 +00:00