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Florian Westphal a2acd9e43b netfilter: nat: limit port clash resolution attempts 
commit a504b703bb1da526a01593da0e4be2af9d9f5fa8 upstream.

In case almost or all available ports are taken, clash resolution can
take a very long time, resulting in soft lockup.

This can happen when many to-be-natted hosts connect to same
destination:port (e.g. a proxy) and all connections pass the same SNAT.

Pick a random offset in the acceptable range, then try ever smaller
number of adjacent port numbers, until either the limit is reached or a
useable port was found.  This results in at most 248 attempts
(128 + 64 + 32 + 16 + 8, i.e. 4 restarts with new search offset)
instead of 64000+,

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-02-08 18:15:28 +01:00
..
ipset
netfilter: ipset: Fix oversized kvmalloc() calls
2021-10-06 10:23:43 +02:00
ipvs
netfilter: ipvs: make global sysctl readonly in non-init netns
2021-10-27 09:33:59 +02:00
core.c
Fix handling of verdicts after NF_QUEUE
2017-12-16 16:25:46 +01:00
Kconfig
netfilter: Kconfig: use 'default y' instead of 'm' for bool config option
2021-10-27 09:34:00 +02:00
Makefile
netfilter: nf_tables: add range expression
2016-09-25 23:16:42 +02:00
nf_conntrack_acct.c
netfilter: Remove uses of seq_<foo> return values
2015-03-18 10:51:35 +01:00
nf_conntrack_amanda.c
net: Remove state argument from skb_find_text()
2015-02-22 15:59:54 -05:00
nf_conntrack_broadcast.c
…
nf_conntrack_core.c
netfilter: conntrack: adjust stop timestamp to real expiry value
2021-08-04 11:58:03 +02:00
nf_conntrack_ecache.c
netfilter: invoke synchronize_rcu after set the _hook_ to NULL
2017-10-08 10:26:09 +02:00
nf_conntrack_expect.c
netfilter: nf_ct_expect: Change __nf_ct_expect_check() return value.
2017-10-21 17:21:34 +02:00
nf_conntrack_extend.c
netfilter: nf_ct_ext: fix possible panic after nf_ct_extend_unregister
2017-08-24 17:12:18 -07:00
nf_conntrack_ftp.c
netfilter: nf_conntrack_ftp: Fix debug output
2019-09-21 07:14:16 +02:00
nf_conntrack_h323_asn1.c
netfilter: nf_conntrack_h323: fix off-by-one in DecodeQ931
2016-07-11 12:32:45 +02:00
nf_conntrack_h323_main.c
netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6
2020-07-09 09:35:57 +02:00
nf_conntrack_h323_types.c
…
nf_conntrack_helper.c
netfilter: nf_ct_helper: permit cthelpers with different names via nfnetlink
2018-03-24 11:00:14 +01:00
nf_conntrack_irc.c
netfilter: Add helper array register/unregister functions
2016-07-21 02:31:53 +02:00
nf_conntrack_l3proto_generic.c
…
nf_conntrack_labels.c
netfilter: connlabels: move set helper to xt_connlabel
2016-07-22 17:05:10 +02:00
nf_conntrack_netbios_ns.c
…
nf_conntrack_netlink.c
netfilter: ctnetlink: add a range check for l3/l4 protonum
2020-10-14 09:48:14 +02:00
nf_conntrack_pptp.c
netfilter: nf_conntrack_pptp: fix compilation warning with W=1 build
2020-06-03 08:16:46 +02:00
nf_conntrack_proto_dccp.c
netfilter: conntrack: dccp: treat SYNC/SYNCACK as invalid if no prior state
2018-08-24 13:12:41 +02:00
nf_conntrack_proto_generic.c
netfilter: remove ip_conntrack* sysctl compat code
2016-08-13 13:27:13 +02:00
nf_conntrack_proto_gre.c
netfilter: gre: Use consistent GRE and PTTP header structure instead of the ones defined by netfilter
2016-09-07 10:36:52 +02:00
nf_conntrack_proto_sctp.c
netfilter: remove ip_conntrack* sysctl compat code
2016-08-13 13:27:13 +02:00
nf_conntrack_proto_tcp.c
netfilter: remove ip_conntrack* sysctl compat code
2016-08-13 13:27:13 +02:00
nf_conntrack_proto_udp.c
netfilter: remove ip_conntrack* sysctl compat code
2016-08-13 13:27:13 +02:00
nf_conntrack_proto_udplite.c
netfilter: conntrack: Only need first 4 bytes to get l4proto ports
2016-08-12 00:41:08 +02:00
nf_conntrack_proto.c
netfilter: remove ip_conntrack* sysctl compat code
2016-08-13 13:27:13 +02:00
nf_conntrack_sane.c
netfilter: Add helper array register/unregister functions
2016-07-21 02:31:53 +02:00
nf_conntrack_seqadj.c
netfilter: seqadj: re-load tcp header pointer after possible head reallocation
2019-01-13 10:03:48 +01:00
nf_conntrack_sip.c
netfilter: nf_conntrack_sip: fix wrong memory initialisation
2017-06-17 06:41:49 +02:00
nf_conntrack_snmp.c
…
nf_conntrack_standalone.c
netfilter: conntrack: Make global sysctls readonly in non-init netns
2021-05-22 10:40:33 +02:00
nf_conntrack_tftp.c
netfilter: Add helper array register/unregister functions
2016-07-21 02:31:53 +02:00
nf_conntrack_timeout.c
netfilter: cttimeout: add netns support
2015-12-14 12:48:58 +01:00
nf_conntrack_timestamp.c
…
nf_dup_netdev.c
net: remove skb_sender_cpu_clear()
2016-03-01 17:36:47 -05:00
nf_internals.h
netfilter: fix nf_queue handling
2016-10-20 19:59:59 +02:00
nf_log_common.c
netfilter: nf_log: get rid of XT_LOG_* macros
2016-09-25 23:16:45 +02:00
nf_log.c
netfilter: nf_log: fix uninit read in nf_log_proc_dostring
2018-08-24 13:12:32 +02:00
nf_nat_amanda.c
…
nf_nat_core.c
netfilter: check for seqadj ext existence before adding it in nf_nat_setup_info
2018-10-20 09:51:32 +02:00
nf_nat_ftp.c
…
nf_nat_helper.c
…
nf_nat_irc.c
…
nf_nat_proto_common.c
netfilter: nat: limit port clash resolution attempts
2022-02-08 18:15:28 +01:00
nf_nat_proto_dccp.c
netfilter: nat: remove l4 protocol port rovers
2022-02-08 18:15:28 +01:00
nf_nat_proto_sctp.c
netfilter: nat: remove l4 protocol port rovers
2022-02-08 18:15:28 +01:00
nf_nat_proto_tcp.c
netfilter: nat: remove l4 protocol port rovers
2022-02-08 18:15:28 +01:00
nf_nat_proto_udp.c
netfilter: nat: remove l4 protocol port rovers
2022-02-08 18:15:28 +01:00
nf_nat_proto_udplite.c
netfilter: nat: remove l4 protocol port rovers
2022-02-08 18:15:28 +01:00
nf_nat_proto_unknown.c
…
nf_nat_redirect.c
netfilter: nf_nat_redirect: add missing NULL pointer check
2015-10-27 06:54:56 +01:00
nf_nat_sip.c
…
nf_nat_tftp.c
…
nf_queue.c
netfilter: fix nf_queue handling
2016-10-20 19:59:59 +02:00
nf_sockopt.c
…
nf_synproxy_core.c
netfilter: synproxy: Fix out of bounds when parsing TCP options
2021-06-30 08:49:14 -04:00
nf_tables_api.c
netfilter: nf_tables: add NFTA_SET_USERDATA if not null
2020-09-12 11:47:33 +02:00
nf_tables_core.c
netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain()
2018-07-11 16:26:42 +02:00
nf_tables_inet.c
netfilter: Add the missed return value check of nft_register_chain_type
2016-09-12 19:54:45 +02:00
nf_tables_netdev.c
netfilter: Add the missed return value check of nft_register_chain_type
2016-09-12 19:54:45 +02:00
nf_tables_trace.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2016-09-25 23:34:19 +02:00
nfnetlink_acct.c
netfilter: nfnetlink: use list_for_each_entry_safe to delete all objects
2016-08-25 13:11:00 +02:00
nfnetlink_cthelper.c
netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches
2021-06-10 12:42:35 +02:00
nfnetlink_cttimeout.c
netfilter: invoke synchronize_rcu after set the _hook_ to NULL
2017-10-08 10:26:09 +02:00
nfnetlink_log.c
netfilter: Remove explicit rcu_read_lock in nf_hook_slow
2016-09-24 21:29:53 +02:00
nfnetlink_queue.c
netfilter: nfnetlink_queue: fix OOB when mac header was cleared
2021-11-26 11:48:38 +01:00
nfnetlink.c
netfilter: nfnetlink: avoid deadlock due to synchronous request_module
2019-08-25 10:51:22 +02:00
nft_bitwise.c
netfilter: nf_tables: validate maximum value of u32 netlink attributes
2016-09-23 09:29:02 +02:00
nft_byteorder.c
netfilter: nf_tables: validate maximum value of u32 netlink attributes
2016-09-23 09:29:02 +02:00
nft_cmp.c
netfilter: nf_tables: validate maximum value of u32 netlink attributes
2016-09-23 09:29:02 +02:00
nft_compat.c
netfilter: nft_compat: fix crash when related match/target module is removed
2016-07-23 12:25:00 +02:00
nft_counter.c
libnl: nla_put_be64(): align on a 64-bit area
2016-04-23 20:13:24 -04:00
nft_ct.c
netfilter: nf_tables: fix mismatch in big-endian system
2019-02-20 10:18:34 +01:00
nft_dup_netdev.c
netfilter: nf_tables: add packet duplication to the netdev family
2016-01-03 21:04:23 +01:00
nft_dynset.c
netfilter: nft_dynset: add timeout extension to template
2021-02-03 23:19:51 +01:00
nft_exthdr.c
netfilter: nft_exthdr: check for IPv6 packet before further processing
2021-07-20 16:21:02 +02:00
nft_fwd_netdev.c
netfilter: nft_fwd_netdev: validate family and chain type
2020-04-02 17:20:35 +02:00
nft_hash.c
netfilter: nft_hash: validate maximum value of u32 netlink hash attribute
2016-11-24 14:40:03 +01:00
nft_immediate.c
netfilter: nf_tables: validate maximum value of u32 netlink attributes
2016-09-23 09:29:02 +02:00
nft_limit.c
netfilter: nft_limit: fix divided by zero panic
2016-10-04 08:59:03 +02:00
nft_log.c
netfilter: nft_log: restrict the log prefix length to 127
2017-06-17 06:41:58 +02:00
nft_lookup.c
netfilter: nft_lookup: remove superfluous element found check
2016-09-23 09:30:48 +02:00
nft_masq.c
netfilter: nft_masq: support port range
2016-03-02 20:05:27 +01:00
nft_meta.c
netfilter: nf_tables: fix mismatch in big-endian system
2019-02-20 10:18:34 +01:00
nft_nat.c
netfilter: nft_nat: allow to specify layer 4 protocol NAT only
2021-08-04 11:58:03 +02:00
nft_numgen.c
netfilter: nft_numgen: add number generation offset
2016-09-22 16:33:05 +02:00
nft_payload.c
netfilter: nf_tables: fix destination register zeroing
2020-09-12 11:47:33 +02:00
nft_queue.c
netfilter: nft_queue: use raw_smp_processor_id()
2017-11-30 08:39:14 +00:00
nft_quota.c
netfilter: nft_quota: introduce nft_overquota()
2016-09-07 11:02:06 +02:00
nft_range.c
netfilter: nft_range: add the missing NULL pointer check
2016-11-24 14:43:35 +01:00
nft_redir.c
netfilter: nf_tables: add register parsing/dumping helpers
2015-04-13 17:17:28 +02:00
nft_reject_inet.c
netfilter: nft_reject: restrict to INPUT/FORWARD/OUTPUT
2016-08-25 12:55:34 +02:00
nft_reject.c
netfilter: nft_reject: restrict to INPUT/FORWARD/OUTPUT
2016-08-25 12:55:34 +02:00
nft_set_hash.c
netfilter: nf_tables: fix race when create new element in dynset
2016-10-27 18:22:02 +02:00
nft_set_rbtree.c
netfilter: nft_set_rbtree: check for inactive element after flag mismatch
2019-05-04 08:49:06 +02:00
x_tables.c
netfilter: x_tables: Use correct memory barriers.
2021-06-03 08:23:27 +02:00
xt_addrtype.c
netfilter: x_tables: Use par->net instead of computing from the passed net devices
2015-09-18 21:58:25 +02:00
xt_AUDIT.c
…
xt_bpf.c
netfilter: xt_bpf: add overflow checks
2020-02-28 15:42:51 +01:00
xt_cgroup.c
netfilter: xt_cgroup: initialize info->priv in cgroup_mt_check_v1()
2018-02-25 11:05:43 +01:00
xt_CHECKSUM.c
…
xt_CLASSIFY.c
…
xt_cluster.c
…
xt_comment.c
…
xt_connbytes.c
…
xt_connlabel.c
netfilter: connlabels: move set helper to xt_connlabel
2016-07-22 17:05:10 +02:00
xt_connlimit.c
netfilter: Enhance the codes used to get random once
2016-09-23 09:30:36 +02:00
xt_connmark.c
netfilter: connmark: ignore skbs with magic untracked conntrack objects
2016-11-08 23:53:36 +01:00
xt_CONNSECMARK.c
…
xt_conntrack.c
netfilter: use_nf_conn_expires helper in more places
2016-08-12 00:43:13 +02:00
xt_cpu.c
…
xt_CT.c
netfilter: xt_CT: fix refcnt leak on error path
2018-03-24 11:00:14 +01:00
xt_dccp.c
…
xt_devgroup.c
…
xt_dscp.c
…
xt_DSCP.c
…
xt_ecn.c
…
xt_esp.c
…
xt_hashlimit.c
netfilter: xt_hashlimit: limit the max size of hashtable
2020-02-28 15:42:56 +01:00
xt_helper.c
netfilter: Remove explicit rcu_read_lock in nf_hook_slow
2016-09-24 21:29:53 +02:00
xt_hl.c
…
xt_HL.c
…
xt_HMARK.c
…
xt_IDLETIMER.c
netfilter: xt_IDLETIMER: add sysfs filename checking routine
2018-11-27 16:09:39 +01:00
xt_ipcomp.c
netfilter: xt_ipcomp: add "ip[6]t_ipcomp" module alias name
2016-10-17 17:38:19 +02:00
xt_iprange.c
…
xt_ipvs.c
ipvs: Pass ipvs into conn_out_get
2015-09-24 09:34:41 +09:00
xt_l2tp.c
…
xt_LED.c
netfilter: x_tables: fix missing timer initialization in xt_LED
2018-03-18 11:18:53 +01:00
xt_length.c
…
xt_limit.c
…
xt_LOG.c
netfilter: x_tables: Use par->net instead of computing from the passed net devices
2015-09-18 21:58:25 +02:00
xt_mac.c
…
xt_mark.c
netfilter: xt_MARK: Add ARP support
2015-05-14 13:00:27 +02:00
xt_multiport.c
…
xt_nat.c
…
xt_NETMAP.c
…
xt_nfacct.c
netfilter: nfnetlink_acct: report overquota to the right netns
2016-08-18 00:38:23 +02:00
xt_NFLOG.c
netfilter: xt_NFLOG: fix unexpected truncated packet
2016-10-17 17:38:19 +02:00
xt_NFQUEUE.c
…
xt_osf.c
netfilter: xt_osf: Add missing permission checks
2018-01-31 12:55:52 +01:00
xt_owner.c
netfilter: Allow xt_owner in any user namespace
2016-06-23 13:58:55 +02:00
xt_physdev.c
netfilter: physdev: relax br_netfilter dependency
2019-04-05 22:29:14 +02:00
xt_pkttype.c
…
xt_policy.c
…
xt_quota.c
…
xt_rateest.c
…
xt_RATEEST.c
netfilter: xt_RATEEST: reject non-null terminated string from userspace
2021-01-12 19:49:05 +01:00
xt_realm.c
…
xt_recent.c
netfilter: xt_recent: Fix attempt to update deleted entry
2021-02-23 13:59:16 +01:00
xt_REDIRECT.c
…
xt_repldata.h
…
xt_sctp.c
sctp: rename WORD_TRUNC/ROUND macros
2016-09-22 03:13:26 -04:00
xt_SECMARK.c
…
xt_set.c
netfilter: ipset: Fix coding styles reported by checkpatch.pl
2015-06-14 10:40:18 +02:00
xt_socket.c
tcp/dccp: do not touch listener sk_refcnt under synflood
2016-04-04 22:11:20 -04:00
xt_state.c
…
xt_statistic.c
…
xt_string.c
net: Remove state argument from skb_find_text()
2015-02-22 15:59:54 -05:00
xt_tcpmss.c
…
xt_TCPMSS.c
netfilter: xt_TCPMSS: add more sanity tests on tcph->doff
2017-07-05 14:40:16 +02:00
xt_TCPOPTSTRIP.c
net: Change pseudohdr argument of inet_proto_csum_replace* to be a bool
2015-08-17 21:33:06 -07:00
xt_tcpudp.c
netfilter: Convert FWINV<[foo]> macros and uses to NF_INVF
2016-07-03 10:55:07 +02:00
xt_TEE.c
netfilter: Add the missed return value check of register_netdevice_notifier
2016-09-12 19:54:43 +02:00
xt_time.c
…
xt_TPROXY.c
netfilter: tproxy: properly refcount tcp listeners
2016-08-18 00:51:13 +02:00
xt_TRACE.c
netfilter: xt_TRACE: add explicitly nf_logger_find_get call
2016-06-23 13:26:49 +02:00
xt_u32.c
…