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linux-stable/net/netfilter
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Florian Westphal f94e63801a netfilter: conntrack: reset tcp maxwin on re-register 
Doug Smythies says:
  Sometimes it is desirable to temporarily disable, or clear,
  the iptables rule set on a computer being controlled via a
  secure shell session (SSH). While unwise on an internet facing
  computer, I also do it often on non-internet accessible computers
  while testing. Recently, this has become problematic, with the
  SSH session being dropped upon re-load of the rule set.

The problem is that when all rules are deleted, conntrack hooks get
unregistered.

In case the rules are re-added later, its possible that tcp window
has moved far enough so that all packets are considered invalid (out of
window) until entry expires (which can take forever, default
established timeout is 5 days).

Fix this by clearing maxwin of existing tcp connections on register.

v2: don't touch entries on hook removal.
v3: remove obsolete expiry check.

Reported-by: Doug Smythies <dsmythies@telus.net>
Fixes: 4d3a57f23d ("netfilter: conntrack: do not enable connection tracking unless needed")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
 		2018-09-11 01:29:24 +02:00
..
ipset netfilter: ipset: forbid family for hash:mac sets 2018-06-06 14:01:00 +02:00
ipvs ipvs: don't show negative times in ip_vs_conn 2018-08-16 19:36:57 +02:00
Kconfig netfilter: xt_checksum: ignore gso skbs 2018-08-24 09:58:16 +02:00
Makefile netfilter: nf_tables: add tunnel support 2018-08-03 21:12:12 +02:00
core.c netfilter: Add nf_ct_get_tuple_skb global lookup function 2018-07-10 20:06:34 -07:00
nf_conncount.c netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search 2018-07-18 11:26:37 +02:00
nf_conntrack_acct.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
nf_conntrack_amanda.c netfilter: use nf_conntrack_helpers_register when possible 2017-06-19 19:13:21 +02:00
nf_conntrack_broadcast.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
nf_conntrack_core.c netfilter: use kvmalloc_array to allocate memory for hashtable 2018-08-03 18:37:55 +02:00
nf_conntrack_ecache.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
nf_conntrack_expect.c netfilter: use kvmalloc_array to allocate memory for hashtable 2018-08-03 18:37:55 +02:00
nf_conntrack_extend.c netfilter: conntrack: include kmemleak.h for kmemleak_not_leak() 2018-04-17 10:59:43 +02:00
nf_conntrack_ftp.c netfilter: add __exit mark to helper modules 2018-04-24 10:29:14 +02:00
nf_conntrack_h323_asn1.c netfilter: nf_conntrack_h323: Remove unwanted comments. 2018-01-08 18:01:05 +01:00
nf_conntrack_h323_main.c netfilter: move route indirection to struct nf_ipv6_ops 2018-01-08 18:01:26 +01:00
nf_conntrack_h323_types.c
…
nf_conntrack_helper.c netfilter: use kvmalloc_array to allocate memory for hashtable 2018-08-03 18:37:55 +02:00
nf_conntrack_irc.c netfilter: add __exit mark to helper modules 2018-04-24 10:29:14 +02:00
nf_conntrack_labels.c netfilter: conntrack: mark extension structs as const 2017-04-26 09:30:22 +02:00
nf_conntrack_netbios_ns.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2018-03-30 11:41:18 -04:00
nf_conntrack_netlink.c netfilter: fix memory leaks on netlink_dump_start error 2018-08-16 19:37:00 +02:00
nf_conntrack_pptp.c netfilter: Remove duplicated rcu_read_lock. 2017-07-24 13:24:46 +02:00
nf_conntrack_proto.c netfilter: conntrack: reset tcp maxwin on re-register 2018-09-11 01:29:24 +02:00
nf_conntrack_proto_dccp.c netfilter: conntrack: place 'new' timeout in first location too 2018-08-29 13:04:38 +02:00
nf_conntrack_proto_generic.c netfilter: conntrack: remove get_timeout() indirection 2018-07-16 17:55:01 +02:00
nf_conntrack_proto_gre.c netfilter: conntrack: remove get_timeout() indirection 2018-07-16 17:55:01 +02:00
nf_conntrack_proto_icmp.c netfilter: conntrack: remove l3proto abstraction 2018-07-17 15:27:49 +02:00
nf_conntrack_proto_icmpv6.c netfilter: conntrack: remove l3proto abstraction 2018-07-17 15:27:49 +02:00
nf_conntrack_proto_sctp.c netfilter: conntrack: place 'new' timeout in first location too 2018-08-29 13:04:38 +02:00
nf_conntrack_proto_tcp.c netfilter: conntrack: place 'new' timeout in first location too 2018-08-29 13:04:38 +02:00
nf_conntrack_proto_udp.c netfilter: conntrack: remove duplicated include from nf_conntrack_proto_udp.c 2018-08-23 20:24:26 +02:00
nf_conntrack_sane.c netfilter: add __exit mark to helper modules 2018-04-24 10:29:14 +02:00
nf_conntrack_seqadj.c netfilter: conntrack: mark extension structs as const 2017-04-26 09:30:22 +02:00
nf_conntrack_sip.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2018-05-06 21:51:37 -04:00
nf_conntrack_snmp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2018-03-30 11:41:18 -04:00
nf_conntrack_standalone.c netfilter: conntrack: remove l3proto abstraction 2018-07-17 15:27:49 +02:00
nf_conntrack_tftp.c netfilter: add __exit mark to helper modules 2018-04-24 10:29:14 +02:00
nf_conntrack_timeout.c netfilter: cttimeout: decouple timeout policy from nfnetlink_cttimeout object 2018-08-07 17:14:15 +02:00
nf_conntrack_timestamp.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
nf_dup_netdev.c netfilter: dup: resolve warnings about missing prototypes 2017-05-29 11:32:36 +02:00
nf_flow_table_core.c netfilter: flowtables: use fixed renew timeout on teardown 2018-07-16 17:51:48 +02:00
nf_flow_table_inet.c netfilter: nf_flow_table: move init code to nf_flow_table_core.c 2018-04-24 10:28:45 +02:00
nf_flow_table_ip.c netfilter: nf_flow_table: attach dst to skbs 2018-06-01 09:47:36 +02:00
nf_internals.h netfilter: core: export raw versions of add/delete hook functions 2018-05-23 09:14:05 +02:00
nf_log.c netfilter: nf_log: don't hold nf_log_mutex during user access 2018-06-26 16:48:40 +02:00
nf_log_common.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
nf_log_netdev.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
nf_nat_amanda.c netfilter: nat: nf_nat_mangle_{udp,tcp}_packet returns boolean 2017-04-06 22:01:38 +02:00
nf_nat_core.c netfilter: use kvmalloc_array to allocate memory for hashtable 2018-08-03 18:37:55 +02:00
nf_nat_ftp.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
nf_nat_helper.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_irc.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
nf_nat_proto_common.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_proto_dccp.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_proto_sctp.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_proto_tcp.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_proto_udp.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_proto_unknown.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_redirect.c netfilter: nat: merge nf_nat_redirect into nf_nat 2018-05-29 00:25:40 +02:00
nf_nat_sip.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_nat_tftp.c
…
nf_queue.c netfilter: remove duplicated include 2018-01-10 15:32:15 +01:00
nf_sockopt.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nf_synproxy_core.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
nf_tables_api.c netfilter: nf_tables: release chain in flushing set 2018-08-31 19:07:11 +02:00
nf_tables_core.c netfilter: nf_tables: handle meta/lookup with direct call 2018-07-30 11:52:02 +02:00
nf_tables_set_core.c netfilter: nf_tables: place all set backends in one single module 2018-07-06 19:31:53 +02:00
nf_tables_trace.c netfilter: nf_tables: Allow chain name of up to 255 chars 2017-07-31 20:41:57 +02:00
nfnetlink.c netfilter: nf_tables: use dedicated mutex to guard transactions 2018-07-18 11:26:48 +02:00
nfnetlink_acct.c netfilter: fix memory leaks on netlink_dump_start error 2018-08-16 19:37:00 +02:00
nfnetlink_cthelper.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
nfnetlink_cttimeout.c netfilter: cttimeout: decouple timeout policy from nfnetlink_cttimeout object 2018-08-07 17:14:15 +02:00
nfnetlink_log.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-06-06 18:39:49 -07:00
nfnetlink_osf.c netfilter: nfnetlink_osf: fix using plain integer as NULL warning 2018-08-08 19:05:39 +02:00
nfnetlink_queue.c netfilter: nf_queue: augment nfqa_cfg_policy 2018-06-18 14:13:24 +02:00
nft_bitwise.c netfilter: nf_tables: revisit chain/object refcounting from elements 2017-05-15 12:51:41 +02:00
nft_byteorder.c
…
nft_chain_filter.c netfilter: nf_tables: don't prevent event handler from device cleanup on netns exit 2018-08-16 19:37:03 +02:00
nft_cmp.c netfilter: mark expected switch fall-throughs 2018-01-08 18:01:01 +01:00
nft_compat.c netfilter: nft_compat: explicitly reject ERROR and standard target 2018-07-09 16:06:19 +02:00
nft_connlimit.c netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search 2018-07-18 11:26:37 +02:00
nft_counter.c netfilter: nf_tables: add destroy_clone expression 2018-06-03 00:02:11 +02:00
nft_ct.c netfilter: nf_tables: rework ct timeout set support 2018-08-29 13:04:38 +02:00
nft_dup_netdev.c
…
nft_dynset.c netfilter: nft_dynset: allow dynamic updates of non-anonymous set 2018-08-16 19:37:11 +02:00
nft_exthdr.c netfilter: nf_tables: merge exthdr expression into nft core 2018-04-27 00:00:56 +02:00
nft_fib.c netfilter: nft_fib: Support existence check 2017-03-13 13:45:36 +01:00
nft_fib_inet.c
…
nft_fib_netdev.c netfilter: nf_tables: add fib expression to the netdev family 2017-07-31 19:01:40 +02:00
nft_flow_offload.c netfilter: nf_tables: simplify lookup functions 2018-04-24 10:29:09 +02:00
nft_fwd_netdev.c netfilter: nft_fwd_netdev: allow to forward packets via neighbour layer 2018-06-01 10:35:47 +02:00
nft_hash.c netfilter: fix ptr_ret.cocci warnings 2018-06-01 09:38:40 +02:00
nft_immediate.c netfilter: nf_tables: fix jumpstack depth validation 2018-07-17 20:48:24 +02:00
nft_limit.c netfilter: nft_limit: fix packet ratelimiting 2018-05-23 09:50:28 +02:00
nft_log.c netfilter: nf_tables: add NFT_LOGLEVEL_* enumeration and use it 2018-06-07 16:14:00 -04:00
nft_lookup.c netfilter: nf_tables: handle meta/lookup with direct call 2018-07-30 11:52:02 +02:00
nft_masq.c netfilter: nf_tables: add single table list for all families 2018-01-10 15:32:08 +01:00
nft_meta.c netfilter: nf_tables: handle meta/lookup with direct call 2018-07-30 11:52:02 +02:00
nft_nat.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nft_numgen.c netfilter: use PTR_ERR_OR_ZERO() 2018-07-30 14:07:09 +02:00
nft_objref.c netfilter: nf_tables: simplify lookup functions 2018-04-24 10:29:09 +02:00
nft_osf.c netfilter: nft_osf: use NFT_OSF_MAXGENRELEN instead of IFNAMSIZ 2018-08-07 17:14:04 +02:00
nft_payload.c netfilter: fix a few (harmless) sparse warnings 2017-08-28 17:42:56 +02:00
nft_queue.c netfilter: Remove exceptional & on function name 2017-04-07 18:24:47 +02:00
nft_quota.c netfilter: nf_tables: add select_ops for stateful objects 2017-09-04 13:25:09 +02:00
nft_range.c netfilter: nf_tables: revisit chain/object refcounting from elements 2017-05-15 12:51:41 +02:00
nft_redir.c netfilter: nf_tables: add single table list for all families 2018-01-10 15:32:08 +01:00
nft_reject.c netfilter: nf_tables: validate the expr explicitly after init successfully 2017-03-06 18:22:12 +01:00
nft_reject_inet.c netfilter: nf_tables: validate the expr explicitly after init successfully 2017-03-06 18:22:12 +01:00
nft_rt.c netfilter: nf_tables: merge rt expression into nft core 2018-04-27 00:00:55 +02:00
nft_set_bitmap.c netfilter: nft_set: fix allocation size overflow in privsize callback. 2018-08-16 19:36:59 +02:00
nft_set_hash.c netfilter: nft_set: fix allocation size overflow in privsize callback. 2018-08-16 19:36:59 +02:00
nft_set_rbtree.c netfilter: nft_set: fix allocation size overflow in privsize callback. 2018-08-16 19:36:59 +02:00
nft_socket.c netfilter: nft_socket: Expose socket mark 2018-07-18 11:26:52 +02:00
nft_tproxy.c netfilter: nft_tproxy: Fix missing-braces warning 2018-08-16 19:37:10 +02:00
nft_tunnel.c netfilter: nft_tunnel: fix sparse errors 2018-08-04 00:53:29 +02:00
utils.c netfilter: utils: move nf_ip6_checksum* from ipv6 to utils 2018-07-16 17:51:48 +02:00
x_tables.c netfilter: x_tables: do not fail xt_alloc_table_info too easilly 2018-08-16 19:37:05 +02:00
xt_AUDIT.c audit: eliminate audit_enabled magic number comparison 2018-06-19 10:43:55 -04:00
xt_CHECKSUM.c netfilter: xt_checksum: ignore gso skbs 2018-08-24 09:58:16 +02:00
xt_CLASSIFY.c
…
xt_CONNSECMARK.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_CT.c netfilter: cttimeout: decouple timeout policy from nfnetlink_cttimeout object 2018-08-07 17:14:15 +02:00
xt_DSCP.c netfilter: x_tables: remove pr_info where possible 2018-02-14 21:05:33 +01:00
xt_HL.c netfilter: x_tables: remove pr_info where possible 2018-02-14 21:05:33 +01:00
xt_HMARK.c netfilter: x_tables: use pr ratelimiting in matches/targets 2018-02-14 21:05:37 +01:00
xt_IDLETIMER.c net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
xt_LED.c netfilter: x_tables: fix missing timer initialization in xt_LED 2018-02-14 21:05:39 +01:00
xt_LOG.c
…
xt_NETMAP.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
xt_NFLOG.c netfilter: xt_NFLOG: use nf_log_packet instead of nfulnl_log_packet. 2018-04-19 13:02:44 +02:00
xt_NFQUEUE.c netfilter: xt_NFQUEUE: use pr ratelimiting 2018-02-14 21:05:35 +01:00
xt_RATEEST.c netfilter: make xt_rateest hash table per net 2018-03-05 23:15:44 +01:00
xt_REDIRECT.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
xt_SECMARK.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_TCPMSS.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_TCPOPTSTRIP.c
…
xt_TEE.c netfilter: Kconfig: Change select IPv6 dependencies 2018-07-17 15:27:54 +02:00
xt_TPROXY.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2018-07-20 22:28:28 -07:00
xt_TRACE.c
…
xt_addrtype.c netfilter: x_tables: use pr ratelimiting in matches/targets 2018-02-14 21:05:37 +01:00
xt_bpf.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_cgroup.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
xt_cluster.c netfilter: xt_cluster: add dependency on conntrack module 2018-08-23 20:26:53 +02:00
xt_comment.c
…
xt_connbytes.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_connlabel.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_connlimit.c netfilter: use PTR_ERR_OR_ZERO() 2018-07-30 14:07:09 +02:00
xt_connmark.c netfilter: xt_connmark: fix list corruption on rmmod 2018-06-12 19:35:52 +02:00
xt_conntrack.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_cpu.c
…
xt_dccp.c
…
xt_devgroup.c
…
xt_dscp.c netfilter: x_tables: remove pr_info where possible 2018-02-14 21:05:33 +01:00
xt_ecn.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_esp.c
…
xt_hashlimit.c netfilter/xt_hashlimit: switch to proc_create_{seq,single}_data 2018-05-16 07:24:30 +02:00
xt_helper.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_hl.c
…
xt_ipcomp.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_iprange.c
…
xt_ipvs.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_l2tp.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_length.c
…
xt_limit.c netfilter: xt_limit: Spelling s/maxmum/maximum/ 2018-03-05 23:15:50 +01:00
xt_mac.c
…
xt_mark.c
…
xt_multiport.c
…
xt_nat.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
xt_nfacct.c netfilter: nfnetlink_acct: remove useless parameter 2018-03-05 23:15:43 +01:00
xt_osf.c netfilter: nfnetlink_osf: extract nfnetlink_subsystem code from xt_osf.c 2018-07-30 14:07:11 +02:00
xt_owner.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
xt_physdev.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_pkttype.c netfilter: pkttype: unnecessary to check ipv6 multicast address 2017-01-18 20:32:43 +01:00
xt_policy.c netfilter: x_tables: use pr ratelimiting in matches/targets 2018-02-14 21:05:37 +01:00
xt_quota.c xtables: extend matches and targets with .usersize 2017-01-09 17:24:55 +01:00
xt_rateest.c netfilter: make xt_rateest hash table per net 2018-03-05 23:15:44 +01:00
xt_realm.c
…
xt_recent.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
xt_repldata.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xt_sctp.c sctp: remove the typedef sctp_chunkhdr_t 2017-07-01 09:08:41 -07:00
xt_set.c netfilter: ipset: Limit max timeout value 2018-06-06 14:00:54 +02:00
xt_socket.c netfilter: check if the socket netns is correct. 2018-06-28 22:21:32 +09:00
xt_state.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
xt_statistic.c netfilter: x_tables: fix pointer leaks to userspace 2018-01-31 14:59:24 +01:00
xt_string.c netfilter: ebtables: Add string filter 2018-03-30 11:04:12 +02:00
xt_tcpmss.c
…
xt_tcpudp.c
…
xt_time.c netfilter: Replace printk() with pr_*() and define pr_fmt() 2018-03-20 13:44:14 +01:00
xt_u32.c
…