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Eric Dumazet c77737b736 netfilter: conntrack: adopt safer max chain length 
Customers using GKE 1.25 and 1.26 are facing conntrack issues
root caused to commit c9c3b6811f ("netfilter: conntrack: make
max chain length random").

Even if we assume Uniform Hashing, a bucket often reachs 8 chained
items while the load factor of the hash table is smaller than 0.5

With a limit of 16, we reach load factors of 3.
With a limit of 32, we reach load factors of 11.
With a limit of 40, we reach load factors of 15.
With a limit of 50, we reach load factors of 24.

This patch changes MIN_CHAINLEN to 50, to minimize risks.

Ideally, we could in the future add a cushion based on expected
load factor (2 * nf_conntrack_max / nf_conntrack_buckets),
because some setups might expect unusual values.

Fixes: c9c3b6811f ("netfilter: conntrack: make max chain length random")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
 		2023-03-07 10:58:06 +01:00
..
ipset net: Kconfig: fix spellos 2023-01-25 22:39:56 -08:00
ipvs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next 2023-02-20 10:53:56 +00:00
Kconfig net: create nf_conntrack_ovs for ovs and tc use 2023-02-10 16:23:03 -08:00
Makefile net: create nf_conntrack_ovs for ovs and tc use 2023-02-10 16:23:03 -08:00
core.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf 2023-02-22 21:25:23 -08:00
nf_conncount.c netfilter: nf_conncount: reduce unnecessary GC 2022-05-16 13:05:40 +02:00
nf_conntrack_acct.c netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_amanda.c
…
nf_conntrack_bpf.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf 2023-02-22 21:25:23 -08:00
nf_conntrack_broadcast.c netfilter: nf_conntrack: use rcu accessors where needed 2022-07-11 16:25:15 +02:00
nf_conntrack_core.c netfilter: conntrack: adopt safer max chain length 2023-03-07 10:58:06 +01:00
nf_conntrack_ecache.c netfilter: ctnetlink: make event listener tracking global 2023-02-22 00:28:47 +01:00
nf_conntrack_expect.c netfilter: conntrack: convert to refcount_t api 2022-01-09 23:30:13 +01:00
nf_conntrack_extend.c netfilter: extensions: introduce extension genid count 2022-05-13 18:52:16 +02:00
nf_conntrack_ftp.c netfilter: nf_ct_ftp: fix deadlock when nat rewrite is needed 2022-09-20 23:50:03 +02:00
nf_conntrack_h323_asn1.c netfilter: Use fallthrough pseudo-keyword 2020-07-22 01:18:05 +02:00
nf_conntrack_h323_main.c netfilter: nf_ct_h323: cap packet size at 64k 2022-08-11 16:50:49 +02:00
nf_conntrack_h323_types.c
…
nf_conntrack_helper.c net: create nf_conntrack_ovs for ovs and tc use 2023-02-10 16:23:03 -08:00
nf_conntrack_irc.c netfilter: nf_conntrack_irc: Tighten matching on DCC message 2022-09-07 15:55:23 +02:00
nf_conntrack_labels.c netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_netbios_ns.c netfilter: nf_conntrack_netbios_ns: fix helper module alias 2022-01-11 10:41:44 +01:00
nf_conntrack_netlink.c netfilter: ctnetlink: revert to dumping mark regardless of event type 2023-03-06 12:09:23 +01:00
nf_conntrack_ovs.c net: extract nf_ct_handle_fragments to nf_conntrack_ovs 2023-02-10 16:23:03 -08:00
nf_conntrack_pptp.c netfilter: nf_conntrack: add missing __rcu annotations 2022-07-11 16:25:15 +02:00
nf_conntrack_proto.c netfilter: conntrack: remove pr_debug calls 2023-01-18 13:05:24 +01:00
nf_conntrack_proto_dccp.c netfilter: conntrack: pass hook state to log functions 2021-06-18 14:47:43 +02:00
nf_conntrack_proto_generic.c
…
nf_conntrack_proto_gre.c netfilter: conntrack: nf_ct_gre_keymap_flush() removal 2021-07-02 02:07:01 +02:00
nf_conntrack_proto_icmp.c netfilter: conntrack: pass hook state to log functions 2021-06-18 14:47:43 +02:00
nf_conntrack_proto_icmpv6.c netfilter: conntrack: set icmpv6 redirects as RELATED 2022-11-30 23:01:20 +01:00
nf_conntrack_proto_sctp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-02-02 14:49:55 -08:00
nf_conntrack_proto_tcp.c netfilter: let reset rules clean out conntrack entries 2023-02-17 13:04:56 +01:00
nf_conntrack_proto_udp.c netfilter: conntrack: udp: fix seen-reply test 2023-02-01 12:18:51 +01:00
nf_conntrack_sane.c netfilter: nf_ct_sane: remove pseudo skb linearization 2022-08-11 16:50:25 +02:00
nf_conntrack_seqadj.c netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_sip.c netfilter: nf_conntrack_sip: fix ct_sip_walk_headers 2022-09-07 15:06:26 +02:00
nf_conntrack_snmp.c
…
nf_conntrack_standalone.c netfilter: conntrack: remote a return value of the 'seq_print_acct' function. 2023-02-01 12:18:52 +01:00
nf_conntrack_tftp.c
…
nf_conntrack_timeout.c netfilter: nf_conntrack: use rcu accessors where needed 2022-07-11 16:25:15 +02:00
nf_conntrack_timestamp.c netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_dup_netdev.c netfilter: nf_dup_netdev: add and use recursion counter 2022-06-21 10:50:41 +02:00
nf_flow_table_core.c netfilter: flowtable: fixup UDP timeout depending on ct state 2023-02-03 09:31:24 +00:00
nf_flow_table_inet.c netfilter: flowtable: cache info of last offload 2023-02-03 09:31:24 +00:00
nf_flow_table_ip.c netfilter: flowtable: add a 'default' case to flowtable datapath 2022-12-08 22:11:00 +01:00
nf_flow_table_offload.c netfilter: flowtable: cache info of last offload 2023-02-03 09:31:24 +00:00
nf_flow_table_procfs.c netfilter: nf_flow_table: count pending offload workqueue tasks 2022-07-11 16:25:14 +02:00
nf_hooks_lwtunnel.c netfilter: add netfilter hooks to SRv6 data plane 2021-08-30 01:51:36 +02:00
nf_internals.h netfilter: ctnetlink: add kernel side filtering for dump 2020-05-27 22:20:34 +02:00
nf_log.c netfilter: move from strlcpy with unused retval to strscpy 2022-09-07 16:46:03 +02:00
nf_log_syslog.c netfilter: use skb_ip_totlen and iph_totlen 2023-02-01 20:54:27 -08:00
nf_nat_amanda.c netfilter: nat: move repetitive nat port reserve loop to a helper 2022-09-07 16:46:04 +02:00
nf_nat_bpf.c bpf: Add __bpf_kfunc tag to all kfuncs 2023-02-02 00:25:14 +01:00
nf_nat_core.c netfilter: nf_nat: Fix possible memory leak in nf_nat_init() 2022-11-02 10:47:22 +01:00
nf_nat_ftp.c netfilter: nat: move repetitive nat port reserve loop to a helper 2022-09-07 16:46:04 +02:00
nf_nat_helper.c treewide: use get_random_u32_below() instead of deprecated function 2022-11-18 02:15:15 +01:00
nf_nat_irc.c netfilter: nat: move repetitive nat port reserve loop to a helper 2022-09-07 16:46:04 +02:00
nf_nat_masquerade.c netfilter: conntrack: add nf_ct_iter_data object for nf_ct_iterate_cleanup*() 2022-05-13 18:56:27 +02:00
nf_nat_ovs.c net: move the nat function to nf_nat_ovs for ovs and tc 2022-12-12 10:14:03 +00:00
nf_nat_proto.c netfilter: nat: move nf_xfrm_me_harder to where it is used 2021-04-26 03:20:07 +02:00
nf_nat_redirect.c
…
nf_nat_sip.c netfilter: nat: move repetitive nat port reserve loop to a helper 2022-09-07 16:46:04 +02:00
nf_nat_tftp.c
…
nf_queue.c netfilter: nf_queue: handle socket prefetch 2022-03-01 11:51:15 +01:00
nf_sockopt.c netfilter: switch nf_setsockopt to sockptr_t 2020-07-24 15:41:54 -07:00
nf_synproxy_core.c ip: Fix data-races around sysctl_ip_default_ttl. 2022-07-15 11:49:55 +01:00
nf_tables_api.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf 2023-02-22 21:25:23 -08:00
nf_tables_core.c netfilter: nf_tables: avoid retpoline overhead for some ct expression calls 2023-01-18 13:05:25 +01:00
nf_tables_offload.c netfilter: nf_tables: bail out early if hardware offload is not supported 2022-06-06 19:19:15 +02:00
nf_tables_trace.c netfilter: nf_tables: avoid skb access on nf_stolen 2022-06-27 19:22:54 +02:00
nfnetlink.c netfilter: ctnetlink: make event listener tracking global 2023-02-22 00:28:47 +01:00
nfnetlink_acct.c netfilter: use nfnetlink_unicast() 2021-05-29 01:04:53 +02:00
nfnetlink_cthelper.c netfilter: nf_conntrack: use rcu accessors where needed 2022-07-11 16:25:15 +02:00
nfnetlink_cttimeout.c netfilter: cttimeout: fix slab-out-of-bounds read typo in cttimeout_net_exit 2022-06-17 23:31:20 +02:00
nfnetlink_hook.c Remove DECnet support from kernel 2022-08-22 14:26:30 +01:00
nfnetlink_log.c net: Get rcv tstamp if needed in nfnetlink_{log, queue}.c 2022-03-03 14:38:48 +00:00
nfnetlink_osf.c netfilter: nfnetlink_osf: fix possible bogus match in nf_osf_find() 2022-09-07 15:55:28 +02:00
nfnetlink_queue.c netfilter: nf_queue: do not allow packet truncation below transport header offset 2022-07-26 21:12:42 +02:00
nft_bitwise.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_byteorder.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_chain_filter.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-22 11:41:16 +01:00
nft_chain_nat.c netfilter: nf_tables: remove unused arg in nft_set_pktinfo_unspec() 2021-05-29 01:04:54 +02:00
nft_chain_route.c netfilter: nf_tables: remove unused arg in nft_set_pktinfo_unspec() 2021-05-29 01:04:54 +02:00
nft_cmp.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_compat.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_connlimit.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_counter.c netfilter: nf_tables: Introduce NFT_MSG_GETRULE_RESET 2022-11-15 10:53:17 +01:00
nft_ct.c netfilter: nf_tables: avoid retpoline overhead for some ct expression calls 2023-01-18 13:05:25 +01:00
nft_ct_fast.c netfilter: nf_tables: avoid retpoline overhead for some ct expression calls 2023-01-18 13:05:25 +01:00
nft_dup_netdev.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_dynset.c netfilter: nf_tables: Introduce NFT_MSG_GETRULE_RESET 2022-11-15 10:53:17 +01:00
nft_exthdr.c sctp: move SCTP_PAD4 and SCTP_TRUNC4 to linux/sctp.h 2022-11-17 21:43:34 -08:00
nft_fib.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_fib_inet.c netfilter: nft_fib: add reduce support 2022-03-20 00:29:47 +01:00
nft_fib_netdev.c netfilter: nft_fib: add reduce support 2022-03-20 00:29:47 +01:00
nft_flow_offload.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_fwd_netdev.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_hash.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_immediate.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_inner.c netfilter: nf_tables: Introduce NFT_MSG_GETRULE_RESET 2022-11-15 10:53:17 +01:00
nft_last.c netfilter: nft_last: copy content when cloning expression 2023-03-01 17:23:23 +01:00
nft_limit.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_log.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_lookup.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_masq.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_meta.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_nat.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_numgen.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_objref.c netfilter: nf_tables: avoid retpoline overhead for objref calls 2023-01-18 13:05:25 +01:00
nft_osf.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_payload.c netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits 2023-01-11 19:18:04 +01:00
nft_queue.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_quota.c netfilter: nft_quota: copy content when cloning expression 2023-03-01 17:23:23 +01:00
nft_range.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_redir.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_reject.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_reject_inet.c netfilter: nf_tables: do not reduce read-only expressions 2022-03-20 00:29:46 +01:00
nft_reject_netdev.c netfilter: nf_tables: do not reduce read-only expressions 2022-03-20 00:29:46 +01:00
nft_rt.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_set_bitmap.c netfilter: nft_set_bitmap: Fix spelling mistake 2022-07-11 16:40:37 +02:00
nft_set_hash.c netfilter: nft_dynset: restore set element counter when failing to update 2022-06-27 19:03:37 +02:00
nft_set_pipapo.c netfilter: nft_set_pipapo: Actually validate intervals in fields after the first one 2022-11-28 13:17:11 +01:00
nft_set_pipapo.h netfilter: nf_tables: prefer direct calls for set lookups 2021-05-29 01:04:27 +02:00
nft_set_pipapo_avx2.c netfilter: nft_set_pipapo_avx2: remove redundant pointer lt 2021-12-24 16:58:17 +01:00
nft_set_pipapo_avx2.h netfilter: nf_tables: prefer direct calls for set lookups 2021-05-29 01:04:27 +02:00
nft_set_rbtree.c netfilter: nft_set_rbtree: skip elements in transaction from garbage collection 2023-01-23 21:38:33 +01:00
nft_socket.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_synproxy.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_tproxy.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_tunnel.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
nft_xfrm.c netfilter: nf_tables: Extend nft_expr_ops::dump callback parameters 2022-11-15 10:46:34 +01:00
utils.c netfilter: use actual socket sk rather than skb sk when routing harder 2020-10-30 12:57:39 +01:00
x_tables.c netfilter: move from strlcpy with unused retval to strscpy 2022-09-07 16:46:03 +02:00
xt_AUDIT.c netfilter: fix clang-12 fmt string warnings 2021-06-01 23:53:51 +02:00
xt_CHECKSUM.c
…
xt_CLASSIFY.c
…
xt_CONNSECMARK.c netfilter: Replace HTTP links with HTTPS ones 2020-07-29 20:09:18 +02:00
xt_CT.c netfilter: nf_conntrack: use rcu accessors where needed 2022-07-11 16:25:15 +02:00
xt_DSCP.c netfilter: x_tables: use correct integer types 2022-07-11 16:40:45 +02:00
xt_HL.c
…
xt_HMARK.c netfilter: xt_HMARK: Use ip_is_fragment() helper 2020-08-28 19:55:51 +02:00
xt_IDLETIMER.c treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
xt_LED.c treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
xt_LOG.c netfilter: log: work around missing softdep backend module 2021-09-21 03:46:56 +02:00
xt_MASQUERADE.c
…
xt_NETMAP.c
…
xt_NFLOG.c netfilter: log: work around missing softdep backend module 2021-09-21 03:46:56 +02:00
xt_NFQUEUE.c
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xt_RATEEST.c netfilter: move from strlcpy with unused retval to strscpy 2022-09-07 16:46:03 +02:00
xt_REDIRECT.c
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xt_SECMARK.c netfilter: xt_SECMARK: add new revision to fix structure layout 2021-05-03 23:02:44 +02:00
xt_TCPMSS.c netfilter: x_tables: use correct integer types 2022-07-11 16:40:45 +02:00
xt_TCPOPTSTRIP.c
…
xt_TEE.c
…
xt_TPROXY.c netfilter: xt_TPROXY: remove pr_debug invocations 2022-07-21 00:56:00 +02:00
xt_TRACE.c netfilter: nf_log: add module softdeps 2021-03-31 22:34:10 +02:00
xt_addrtype.c
…
xt_bpf.c bpf: Refactor BPF_PROG_RUN into a function 2021-08-17 00:45:07 +02:00
xt_cgroup.c
…
xt_cluster.c
…
xt_comment.c
…
xt_connbytes.c
…
xt_connlabel.c
…
xt_connlimit.c netfilter: x_tables: use correct integer types 2022-07-11 16:40:45 +02:00
xt_connmark.c netfilter: conntrack: Fix data-races around ct mark 2022-11-18 15:21:00 +01:00
xt_conntrack.c
…
xt_cpu.c
…
xt_dccp.c
…
xt_devgroup.c
…
xt_dscp.c
…
xt_ecn.c
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xt_esp.c
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xt_hashlimit.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
xt_helper.c
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xt_hl.c
…
xt_ipcomp.c
…
xt_iprange.c
…
xt_ipvs.c
…
xt_l2tp.c
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xt_length.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf 2023-02-22 21:25:23 -08:00
xt_limit.c netfilter: x_tables: improve limit_mt scalability 2021-05-29 01:04:52 +02:00
xt_mac.c
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xt_mark.c
…
xt_multiport.c
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xt_nat.c netfilter: Add MODULE_DESCRIPTION entries to kernel modules 2020-06-25 00:50:31 +02:00
xt_nfacct.c netfilter: Remove unnecessary conversion to bool 2020-12-01 09:45:29 +01:00
xt_osf.c
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xt_owner.c
…
xt_physdev.c netfilter: inline xt_hashlimit, ebt_802_3 and xt_physdev headers 2019-09-13 12:32:48 +02:00
xt_pkttype.c
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xt_policy.c
…
xt_quota.c
…
xt_rateest.c
…
xt_realm.c
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xt_recent.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
xt_repldata.h
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xt_sctp.c sctp: move SCTP_PAD4 and SCTP_TRUNC4 to linux/sctp.h 2022-11-17 21:43:34 -08:00
xt_set.c
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xt_socket.c netfilter: xt_socket: missing ifdef CONFIG_IP6_NF_IPTABLES dependency 2022-02-13 23:55:48 +01:00
xt_state.c
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xt_statistic.c treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
xt_string.c
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xt_tcpmss.c
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xt_tcpudp.c
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xt_time.c netfilter: Replace HTTP links with HTTPS ones 2020-07-29 20:09:18 +02:00
xt_u32.c
…