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Pablo Neira Ayuso 397c830097 netfilter: nf_conntrack_helper: cap maximum number of expectation at helper registration 
On helper registration, the maximum number of expectations cannot go over
NF_CT_EXPECT_MAX_CNT (255), but zero can be specified then
nf_conntrack_expect_max applies. Turn zero into NF_CT_EXPECT_MAX_CNT
otherwise, expectation LRU eviction on insertion is disabled.

Moreover, expand this sanity check all expectation classes.

This max_expecy policy is only tunable since userspace helpers are
available, set Fixes: tag to the commit that adds such infrastructure.

Remove the check for p->max_expected given this field must always
be non-zero after this patch.

Fixes: 12f7a50533 ("netfilter: add user-space connection tracking helper infrastructure")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2026-06-23 13:10:48 +02:00
..
ipset
netfilter: ipset: make sure gc is properly stopped
2026-06-21 00:18:26 +02:00
ipvs
ipvs: Replace use of system_unbound_wq with system_dfl_long_wq
2026-06-14 12:49:32 +02:00
core.c
netfilter: remove nf_ipv6_ops and use direct function calls
2026-03-29 11:21:24 -07:00
Kconfig
netfilter: conntrack: add deprecation warnings for irc and pptp trackers
2026-06-23 13:10:34 +02:00
Makefile
netfilter: allow nfnetlink built-in only
2026-05-24 22:55:47 +02:00
nf_bpf_link.c
netfilter: bpf: defer hook memory release until rcu readers are done
2026-03-19 10:26:31 +01:00
nf_conncount.c
netfilter: nf_conncount: prevent connlimit drops for early confirmed ct
2026-06-23 08:11:21 +02:00
nf_conntrack_acct.c
…
nf_conntrack_amanda.c
netfilter: nf_conntrack_helper: dynamically allocate struct nf_conntrack_helper
2026-06-05 13:25:18 +02:00
nf_conntrack_bpf.c
Merge tag 'net-next-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2026-02-11 19:31:52 -08:00
nf_conntrack_broadcast.c
netfilter: nf_conntrack_expect: store master_tuple in expectation
2026-06-23 13:10:34 +02:00
nf_conntrack_core.c
netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
2026-06-21 00:18:27 +02:00
nf_conntrack_ecache.c
netfilter: ctnetlink: ensure safe access to master conntrack
2026-03-26 13:18:32 +01:00
nf_conntrack_expect.c
netfilter: nf_conntrack_helper: cap maximum number of expectation at helper registration
2026-06-23 13:10:48 +02:00
nf_conntrack_extend.c
netfilter: conntrack: revert ct extension genid infrastructure
2026-06-05 16:16:44 +02:00
nf_conntrack_ftp.c
netfilter: conntrack: check NULL when retrieving ct extension
2026-06-14 12:51:55 +02:00
nf_conntrack_h323_asn1.c
netfilter: nf_conntrack_h323: Correct indentation when H323_TRACE defined
2026-04-08 07:51:31 +02:00
nf_conntrack_h323_main.c
netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
2026-06-21 00:18:27 +02:00
nf_conntrack_h323_types.c
…
nf_conntrack_helper.c
netfilter: nf_conntrack_helper: cap maximum number of expectation at helper registration
2026-06-23 13:10:48 +02:00
nf_conntrack_irc.c
netfilter: conntrack: add deprecation warnings for irc and pptp trackers
2026-06-23 13:10:34 +02:00
nf_conntrack_labels.c
…
nf_conntrack_netbios_ns.c
netfilter: nf_conntrack_helper: dynamically allocate struct nf_conntrack_helper
2026-06-05 13:25:18 +02:00
nf_conntrack_netlink.c
netfilter: nf_conntrack_expect: store master_tuple in expectation
2026-06-23 13:10:34 +02:00
nf_conntrack_ovs.c
netfilter: nf_conntrack_helper: add refcounting from datapath
2026-06-05 16:16:44 +02:00
nf_conntrack_pptp.c
netfilter: conntrack: add deprecation warnings for irc and pptp trackers
2026-06-23 13:10:34 +02:00
nf_conntrack_proto_generic.c
netfilter: nf_conntrack: Add allow_clash to generic protocol handler
2026-01-20 16:23:37 +01:00
nf_conntrack_proto_gre.c
netfilter: conntrack: check NULL when retrieving ct extension
2026-06-14 12:51:55 +02:00
nf_conntrack_proto_icmp.c
netfilter: nf_conntrack: enable icmp clash support
2026-01-20 16:23:37 +01:00
nf_conntrack_proto_icmpv6.c
netfilter: nf_conntrack: enable icmp clash support
2026-01-20 16:23:37 +01:00
nf_conntrack_proto_sctp.c
netfilter: skip recording stale or retransmitted INIT
2026-04-28 17:52:19 -07:00
nf_conntrack_proto_tcp.c
netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
2026-06-07 11:13:47 +02:00
nf_conntrack_proto_udp.c
netfilter: conntrack: remove UDP-Lite conntrack support
2026-04-10 12:16:26 +02:00
nf_conntrack_proto.c
netfilter: nf_conntrack_helper: add refcounting from datapath
2026-06-05 16:16:44 +02:00
nf_conntrack_sane.c
netfilter: conntrack: check NULL when retrieving ct extension
2026-06-14 12:51:55 +02:00
nf_conntrack_seqadj.c
netfilter: conntrack: check NULL when retrieving ct extension
2026-06-14 12:51:55 +02:00
nf_conntrack_sip.c
netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
2026-06-21 00:18:27 +02:00
nf_conntrack_snmp.c
netfilter: nf_conntrack_helper: dynamically allocate struct nf_conntrack_helper
2026-06-05 13:25:18 +02:00
nf_conntrack_standalone.c
netfilter: conntrack: remove UDP-Lite conntrack support
2026-04-10 12:16:26 +02:00
nf_conntrack_tftp.c
netfilter: nf_conntrack_helper: dynamically allocate struct nf_conntrack_helper
2026-06-05 13:25:18 +02:00
nf_conntrack_timeout.c
netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount
2026-06-05 13:11:55 +02:00
nf_conntrack_timestamp.c
…
nf_dup_netdev.c
Merge tag 'nf-next-26-06-14' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
2026-06-15 14:09:57 -07:00
nf_flow_table_bpf.c
bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs
2026-01-02 12:04:28 -08:00
nf_flow_table_core.c
netfilter: flowtable: fix offloaded ct timeout never being extended
2026-06-19 10:54:01 +02:00
nf_flow_table_inet.c
…
nf_flow_table_ip.c
netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
2026-06-23 08:11:21 +02:00
nf_flow_table_offload.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2026-04-02 11:03:13 -07:00
nf_flow_table_path.c
netfilter: nft_flow_offload: zero device address for non-ether case
2026-06-21 00:18:27 +02:00
nf_flow_table_procfs.c
…
nf_flow_table_xdp.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
nf_hooks_lwtunnel.c
…
nf_internals.h
…
nf_log_syslog.c
netfilter: nf_log: validate MAC header was set before dumping it
2026-06-10 18:00:01 +02:00
nf_log.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
nf_nat_amanda.c
netfilter: conntrack: remove sprintf usage
2026-04-20 23:27:46 +02:00
nf_nat_bpf.c
bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs
2026-01-02 12:04:28 -08:00
nf_nat_core.c
netfilter: nf_nat: avoid invalid nat_net pointer use on failed nf_nat_init()
2026-06-23 08:11:21 +02:00
nf_nat_ftp.c
…
nf_nat_helper.c
…
nf_nat_irc.c
…
nf_nat_masquerade.c
netfilter: remove nf_ipv6_ops and use direct function calls
2026-03-29 11:21:24 -07:00
nf_nat_ovs.c
netfilter: nf_conntrack: don't rely on implicit includes
2026-01-20 16:23:37 +01:00
nf_nat_proto.c
netfilter: conntrack: remove UDP-Lite conntrack support
2026-04-10 12:16:26 +02:00
nf_nat_redirect.c
…
nf_nat_sip.c
Merge tag 'nf-next-26-06-14' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
2026-06-15 14:09:57 -07:00
nf_nat_tftp.c
…
nf_queue.c
netfilter: nf_queue: pin bridge device while NFQUEUE holds fake dst
2026-06-19 12:19:58 +02:00
nf_sockopt.c
…
nf_synproxy_core.c
netfilter: synproxy: fix unaligned memory access in timestamp adjustment
2026-06-05 13:11:55 +02:00
nf_tables_api.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nf_tables_core.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nf_tables_offload.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nf_tables_trace.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nfnetlink_acct.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nfnetlink_cthelper.c
netfilter: conntrack: check NULL when retrieving ct extension
2026-06-14 12:51:55 +02:00
nfnetlink_cttimeout.c
netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount
2026-06-05 13:11:55 +02:00
nfnetlink_hook.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nfnetlink_log.c
netfilter: revalidate bridge ports
2026-06-10 17:58:20 +02:00
nfnetlink_osf.c
netfilter: nfnetlink_osf: fix mss parsing on big-endian architectures
2026-06-05 13:11:54 +02:00
nfnetlink_queue.c
netfilter: nf_queue: pin bridge device while NFQUEUE holds fake dst
2026-06-19 12:19:58 +02:00
nfnetlink.c
net: Add SPDX ids to some source files
2026-03-09 18:32:45 -07:00
nft_bitwise.c
netfilter: nf_tables: fix dst corruption in same register operation
2026-05-22 12:28:46 +02:00
nft_byteorder.c
netfilter: nft_byteorder: remove multi-register support
2026-06-01 13:43:53 +02:00
nft_chain_filter.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2026-03-12 12:53:34 -07:00
nft_chain_nat.c
…
nft_chain_route.c
…
nft_cmp.c
netfilter: nf_tables: add netlink policy based cap on registers
2026-04-08 07:51:31 +02:00
nft_compat.c
netfilter: nft_compat: ebtables emulation must reject non-bridge targets
2026-06-23 08:11:22 +02:00
nft_connlimit.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_counter.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_ct_fast.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_ct.c
netfilter: nft_ct: expectation timeouts are passed in milliseconds
2026-06-23 13:10:47 +02:00
nft_dup_netdev.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_dynset.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_exthdr.c
Merge tag 'nf-next-26-06-14' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
2026-06-15 14:09:57 -07:00
nft_fib_inet.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_fib_netdev.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_fib.c
Merge tag 'nf-next-26-06-14' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
2026-06-15 14:09:57 -07:00
nft_flow_offload.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_fwd_netdev.c
netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them
2026-06-14 13:07:03 +02:00
nft_hash.c
netfilter: nf_tables: add netlink policy based cap on registers
2026-04-08 07:51:31 +02:00
nft_immediate.c
netfilter: nf_tables_offload: add nft_flow_action_entry_next() and use it
2026-04-08 07:51:31 +02:00
nft_inner.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_last.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2026-02-26 10:23:00 -08:00
nft_limit.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_log.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_lookup.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_masq.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_meta.c
netfilter: nft_meta_bridge: add validate callback for get operations
2026-06-21 00:18:26 +02:00
nft_nat.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_numgen.c
netfilter: nf_tables: add netlink policy based cap on registers
2026-04-08 07:51:31 +02:00
nft_objref.c
netfilter: nf_tables: add netlink policy based cap on registers
2026-04-08 07:51:31 +02:00
nft_osf.c
netfilter: nf_tables: skip L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
nft_payload.c
netfilter: nft_payload: reject offsets exceeding 65535 bytes
2026-06-21 00:18:26 +02:00
nft_queue.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_quota.c
netfilter: add more netlink-based policy range checks
2026-04-08 07:51:30 +02:00
nft_range.c
netfilter: nf_tables: add netlink policy based cap on registers
2026-04-08 07:51:31 +02:00
nft_redir.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_reject_inet.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_reject_netdev.c
netfilter: nf_tables: remove register tracking infrastructure
2026-02-25 19:36:26 -08:00
nft_reject.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_rt.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_set_bitmap.c
netfilter: nft_set_bitmap: fix lockdep splat due to missing annotation
2025-09-10 20:28:24 +02:00
nft_set_hash.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_set_pipapo_avx2.c
netfilter: nft_set_pipapo_avx2: restore performance optimization
2026-05-24 22:55:48 +02:00
nft_set_pipapo_avx2.h
netfilter: nft_set_pipapo: use avx2 algorithm for insertions too
2025-08-20 13:52:37 +02:00
nft_set_pipapo.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_set_pipapo.h
netfilter: nft_set_pipapo: increment data in one step
2026-04-08 07:51:31 +02:00
nft_set_rbtree.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_socket.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_synproxy.c
netfilter: nft_synproxy: stop bypassing the priv->info snapshot
2026-06-23 08:11:22 +02:00
nft_tproxy.c
netfilter: nf_tables: skip L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
nft_tunnel.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
nft_xfrm.c
netfilter: nf_tables: use DEBUG_NET_WARN_ON_ONCE in packet and control paths
2026-06-14 12:50:01 +02:00
utils.c
netfilter: remove nf_ipv6_ops and use direct function calls
2026-03-29 11:21:24 -07:00
x_tables.c
netfilter: x_tables: add and use xtables_unregister_table_exit
2026-05-08 01:30:16 +02:00
xt_addrtype.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_AUDIT.c
audit: add audit_log_nf_skb helper function
2025-12-16 11:04:14 -05:00
xt_bpf.c
…
xt_cgroup.c
netfilter: x_tables: ensure names are nul-terminated
2026-04-01 11:55:29 +02:00
xt_CHECKSUM.c
…
xt_CLASSIFY.c
…
xt_cluster.c
netfilter: xt_cluster: reject template conntracks in hash match
2026-06-19 12:22:14 +02:00
xt_comment.c
…
xt_connbytes.c
net: Add SPDX ids to some source files
2026-03-09 18:32:45 -07:00
xt_connlabel.c
…
xt_connlimit.c
net: Add SPDX ids to some source files
2026-03-09 18:32:45 -07:00
xt_connmark.c
…
xt_CONNSECMARK.c
…
xt_conntrack.c
…
xt_cpu.c
netfilter: xt_cpu: prefer raw_smp_processor_id
2026-05-22 12:28:46 +02:00
xt_CT.c
netfilter: nf_conntrack_helper: add refcounting from datapath
2026-06-05 16:16:44 +02:00
xt_dccp.c
netfilter: add deprecation warning for dccp support
2026-04-08 07:51:27 +02:00
xt_devgroup.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_dscp.c
…
xt_DSCP.c
…
xt_ecn.c
netfilter: xtables: fix L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
xt_esp.c
…
xt_hashlimit.c
netfilter: xtables: fix L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
xt_helper.c
…
xt_hl.c
netfilter: xt_HL: add pr_fmt and checkentry validation
2026-04-10 12:16:26 +02:00
xt_HL.c
…
xt_HMARK.c
…
xt_IDLETIMER.c
netfilter: xt_IDLETIMER: Switch to alarm_start_timer()
2026-05-01 21:36:14 +02:00
xt_ipcomp.c
…
xt_iprange.c
…
xt_ipvs.c
…
xt_l2tp.c
…
xt_LED.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_length.c
…
xt_limit.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_LOG.c
…
xt_mac.c
netfilter: xtables: restrict several matches to inet family
2026-04-20 23:27:52 +02:00
xt_mark.c
…
xt_MASQUERADE.c
…
xt_multiport.c
netfilter: xt_multiport: validate range encoding in checkentry
2026-04-08 13:33:38 +02:00
xt_nat.c
…
xt_NETMAP.c
…
xt_nfacct.c
…
xt_NFLOG.c
…
xt_NFQUEUE.c
netfilter: xt_NFQUEUE: prefer raw_smp_processor_id
2026-06-01 13:43:52 +02:00
xt_osf.c
netfilter: xtables: fix L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
xt_owner.c
netfilter: xtables: restrict several matches to inet family
2026-04-20 23:27:52 +02:00
xt_physdev.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_pkttype.c
…
xt_policy.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_quota.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_rateest.c
netfilter: x_tables: ensure names are nul-terminated
2026-04-01 11:55:29 +02:00
xt_RATEEST.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_realm.c
netfilter: xtables: restrict several matches to inet family
2026-04-20 23:27:52 +02:00
xt_recent.c
Convert 'alloc_flex' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_REDIRECT.c
…
xt_repldata.h
…
xt_sctp.c
…
xt_SECMARK.c
…
xt_set.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_socket.c
netfilter: xt_socket: enable defrag after all other checks
2026-04-10 12:16:26 +02:00
xt_state.c
…
xt_statistic.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_string.c
…
xt_tcpmss.c
netfilter: xtables: fix L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
xt_TCPMSS.c
netfilter: x_tables: add .check_hooks to matches and targets
2026-04-30 08:03:22 +02:00
xt_TCPOPTSTRIP.c
…
xt_tcpudp.c
netfilter: x_tables: guard option walkers against 1-byte tail reads
2026-03-10 14:10:42 +01:00
xt_TEE.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
xt_time.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2026-03-19 14:16:00 -07:00
xt_TPROXY.c
netfilter: xtables: fix L4 header parsing for non-first fragments
2026-04-30 17:59:01 +02:00
xt_TRACE.c
…
xt_u32.c
…