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Eric Dumazet 4cdf507d54 icmp: add a global rate limitation 
Current ICMP rate limiting uses inetpeer cache, which is an RBL tree
protected by a lock, meaning that hosts can be stuck hard if all cpus
want to check ICMP limits.

When say a DNS or NTP server process is restarted, inetpeer tree grows
quick and machine comes to its knees.

iptables can not help because the bottleneck happens before ICMP
messages are even cooked and sent.

This patch adds a new global limitation, using a token bucket filter,
controlled by two new sysctl :

icmp_msgs_per_sec - INTEGER
    Limit maximal number of ICMP packets sent per second from this host.
    Only messages whose type matches icmp_ratemask are
    controlled by this limit.
    Default: 1000

icmp_msgs_burst - INTEGER
    icmp_msgs_per_sec controls number of ICMP packets sent per second,
    while icmp_msgs_burst controls the burst size of these packets.
    Default: 50

Note that if we really want to send millions of ICMP messages per
second, we might extend idea and infra added in commit 04ca6973f7
("ip: make IP identifiers less predictable") :
add a token bucket in the ip_idents hash and no longer rely on inetpeer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2014-09-23 12:47:38 -04:00
..
9p 9pnet: p9_client->conn field is unused. Remove it. 2014-03-25 16:38:16 -05:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-09-08 11:14:56 -04:00
caif
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irda include/net/: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
iucv
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netfilter netfilter: nf_tables: add new nft_masq expression 2014-09-09 16:31:30 +02:00
netns net/ipv4: bind ip_nonlocal_bind to current netns 2014-09-09 11:27:09 -07:00
nfc NFC: digital: Add 'tg_listen_md' and 'tg_get_rf_tech' driver hooks 2014-07-23 01:17:31 +02:00
phonet
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sctp net: sctp: fix ABI mismatch through sctp_assoc_to_state helper 2014-08-29 20:31:08 -07:00
tc_act net_sched: act: hide struct tcf_common from API 2014-02-12 19:23:32 -05:00
6lowpan.h 6lowpan: remove unused function 2014-07-30 19:28:41 +02:00
Space.h drivers: net: Include new header file in sbni.c 2013-12-19 18:51:20 -05:00
act_api.h net_sched: act: refuse to remove bound action outside 2014-02-12 19:23:32 -05:00
addrconf.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-09-23 12:09:27 -04:00
af_ieee802154.h ieee802154: add dgram sockopts for security control 2014-05-16 17:23:41 -04:00
af_rxrpc.h
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af_unix.h
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af_vsock.h vsock: Make transport the proto owner 2014-05-05 13:13:50 -04:00
ah.h
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arp.h arp: make arp_invalidate static 2013-12-28 17:02:46 -05:00
atmclip.h
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ax25.h
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ax88796.h
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busy_poll.h sched, net: Fixup busy_loop_us_clock() 2014-01-13 17:39:11 +01:00
cfg80211-wext.h
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cfg80211.h cfg80211: allow passing frame type to cfg80211_inform_bss() 2014-08-26 11:16:02 +02:00
checksum.h net: Allow csum_add to be provided in arch 2014-05-05 15:26:29 -04:00
cipso_ipv4.h cipso: cleanup cipso_v4_translate() when !CONFIG_NETLABEL 2013-12-10 17:56:54 -05:00
cls_cgroup.h cgroup: clean up cgroup_subsys names and initialization 2014-02-08 10:36:58 -05:00
codel.h net: use ktime_get_ns() and ktime_get_real_ns() helpers 2014-08-22 19:57:23 -07:00
compat.h
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datalink.h net: Move prototype declaration to header file include/net/datalink.h from net/ipx/af_ipx.c 2014-02-09 17:32:50 -08:00
dcbevent.h include/net/: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
dcbnl.h Update setapp/getapp prototypes in dcbnl_rtnl_ops to return int instead of u8 2014-07-17 16:02:29 -07:00
dn.h net: Move prototype declaration to header file include/net/dn.h from net/decnet/af_decnet.c 2014-02-09 17:32:49 -08:00
dn_dev.h dn_dev: add support for IFA_FLAGS nl attribute 2013-12-10 21:50:00 -05:00
dn_fib.h
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dn_neigh.h
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dn_nsp.h
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dn_route.h net: Move prototype declaration to appropriate header file from decnet/af_decnet.c 2014-02-09 17:32:49 -08:00
dsa.h net: dsa: add {get, set}_wol callbacks to slave devices 2014-09-22 14:41:23 -04:00
dsfield.h
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dst.h xfrm: Generate queueing routes only from route lookup functions 2014-09-16 10:08:49 +02:00
dst_ops.h
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esp.h net: move pskb_put() to core code 2013-11-07 19:28:58 -05:00
ethoc.h net: ethoc: set up MII management bus clock 2014-02-04 20:19:51 -08:00
fib_rules.h
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firewire.h
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flow.h ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif 2014-04-16 15:05:11 -04:00
flow_keys.h net: Add function for parsing the header length out of linear ethernet frames 2014-09-05 17:47:02 -07:00
flowcache.h flowcache: Make flow cache name space aware 2014-02-12 07:02:11 +01:00
garp.h
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gen_stats.h
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genetlink.h genetlink: add function genl_has_listeners() 2014-09-19 17:28:26 -04:00
gre.h gre: Call gso_make_checksum 2014-06-04 22:46:38 -07:00
gro_cells.h
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icmp.h
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ieee80211_radiotap.h mac80211: propagate STBC / LDPC flags to radiotap 2014-02-06 09:34:58 +01:00
ieee802154.h ieee802154: add definitions for link-layer security and header functions 2014-05-15 15:51:42 -04:00
ieee802154_netdev.h ieee802154, mac802154: implement devkey record option 2014-05-16 17:23:42 -04:00
if_inet6.h ipv6: addrconf: implement address generation modes 2014-07-11 15:05:45 -07:00
inet6_connection_sock.h ipv4: add a sock pointer to ip_queue_xmit() 2014-04-15 12:58:34 -04:00
inet6_hashtables.h ipv6: split inet6_ehashfn to hash functions per compilation unit 2013-10-19 19:45:34 -04:00
inet_common.h
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inet_connection_sock.h tcp: avoid possible arithmetic overflows 2014-09-22 16:27:10 -04:00
inet_ecn.h tunnel: fix RFC number in comment for INET_ECN_decapsulate() 2014-05-07 15:30:52 -04:00
inet_frag.h inet: frags: use kmem_cache for inet_frag_queue 2014-08-02 15:31:31 -07:00
inet_hashtables.h net: Use a more standard macro for INET_ADDR_COOKIE 2014-05-14 16:07:23 -04:00
inet_sock.h net: remove inet6_reqsk_alloc 2014-06-27 15:53:35 -07:00
inet_timewait_sock.h inet: move ipv6only in sock_common 2014-07-01 23:46:21 -07:00
inetpeer.h inet: remove dead inetpeer sequence code 2014-09-08 16:42:42 -07:00
ip.h icmp: add a global rate limitation 2014-09-23 12:47:38 -04:00
ip6_checksum.h net: add gro_compute_pseudo functions 2014-08-24 18:09:23 -07:00
ip6_fib.h ipv6: do not overwrite inetpeer metrics prematurely 2014-03-27 15:09:07 -04:00
ip6_route.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-05-24 00:32:30 -04:00
ip6_tunnel.h net: unify the pcpu_tstats and br_cpu_netstats as one 2014-01-04 20:10:24 -05:00
ip_fib.h ipv4: harden fnhe_hashfun() 2014-09-05 17:40:33 -07:00
ip_tunnels.h net: Changes to ip_tunnel to support foo-over-udp encapsulation 2014-09-19 17:15:32 -04:00
ip_vs.h arch: Mass conversion of smp_mb__*() 2014-04-18 14:20:48 +02:00
ipcomp.h
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ipconfig.h
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ipv6.h ipv6: add sysctl_mld_qrv to configure query robustness variable 2014-09-04 22:26:14 -07:00
ipx.h net: Move prototype declaration to header file include/net/ipx.h from net/ipx/af_ipx.c 2014-02-09 17:32:50 -08:00
iw_handler.h
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lapb.h
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lib80211.h
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llc.h llc: make lock static 2014-01-03 20:56:48 -05:00
llc_c_ac.h
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llc_c_ev.h
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llc_c_st.h
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llc_conn.h
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llc_if.h
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llc_pdu.h net: llc: fix order of evaluation in llc_conn_ac_inc_vr_by_1 2014-01-01 22:22:43 -05:00
llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h
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llc_sap.h
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mac80211.h mac80211: don't resize skbs needlessly 2014-08-26 11:16:00 +02:00
mac802154.h mac802154: at86rf230: add hw flags and merge ops 2014-07-07 21:29:24 -07:00
mip6.h include/net/: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
mld.h ipv6: mld: answer mldv2 queries with mldv1 reports in mldv1 fallback 2014-09-22 16:23:15 -04:00
mrp.h
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ndisc.h
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neighbour.h neigh: sysctl - simplify address calculation of gc_* variables 2014-07-14 14:32:51 -07:00
net_namespace.h 6lowpan: nuke net_ieee802154_lowpan() accessor when 6lowpan is disabled 2014-04-24 12:36:00 -04:00
net_ratelimit.h
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netdma.h
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netevent.h
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netlabel.h netlabel: fix the netlbl_catmap_setlong() dummy function 2014-08-07 20:55:21 -04:00
netlink.h netlink: Fix shadow warning on jiffies 2014-07-28 17:20:43 -07:00
netprio_cgroup.h cgroup: clean up cgroup_subsys names and initialization 2014-02-08 10:36:58 -05:00
netrom.h
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nexthop.h
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nl802154.h ieee802154: use ieee802154_addr instead of *_sa variants 2014-03-14 22:15:26 -04:00
p8022.h
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ping.h ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams 2014-01-19 19:53:18 -08:00
pkt_cls.h sched, cls: check if we could overwrite actions when changing a filter 2014-04-27 23:42:39 -04:00
pkt_sched.h net: use ktime_get_ns() and ktime_get_real_ns() helpers 2014-08-22 19:57:23 -07:00
protocol.h net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
psnap.h
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raw.h
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rawv6.h
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red.h reciprocal_divide: update/correction of the algorithm 2014-01-21 23:17:20 -08:00
regulatory.h regulatory: add NUL to alpha2 2014-08-15 13:51:40 +02:00
request_sock.h
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rose.h
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route.h ipv4: remove ip_rt_dump from route.c 2014-03-24 12:45:01 -04:00
rtnetlink.h net: rtnetlink - make create_link take name_assign_type 2014-07-15 16:13:07 -07:00
sch_generic.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-09-23 12:09:27 -04:00
scm.h
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secure_seq.h inetpeer: get rid of ip_id_count 2014-06-02 11:00:41 -07:00
slhc_vj.h
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snmp.h net: fix sparse warnings in SNMP_UPD_PO_STATS(_BH) 2014-09-19 17:22:31 -04:00
sock.h net-timestamp: optimize sock_tx_timestamp default path 2014-09-09 17:34:41 -07:00
stp.h
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tcp.h tcp: remove TCP_SKB_CB(skb)->when 2014-09-05 17:49:33 -07:00
tcp_memcontrol.h tcp_memcontrol: Kill struct tcp_memcontrol 2013-10-21 18:43:02 -04:00
tcp_states.h
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timewait_sock.h
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transp_v6.h ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams 2014-01-19 19:53:18 -08:00
tso.h net: Add a software TSO helper API 2014-05-22 14:57:15 -04:00
udp.h udp: additional GRO support 2014-08-24 18:09:24 -07:00
udp_tunnel.h udp-tunnel: Add a few more UDP tunnel APIs 2014-09-19 15:57:15 -04:00
udplite.h
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vsock_addr.h
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vxlan.h vxlan: Call udp_flow_src_port 2014-07-07 21:14:21 -07:00
wext.h
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wimax.h net: treewide: Fix typo found in DocBook/networking.xml 2014-09-05 17:35:28 -07:00
wpan-phy.h ieee802154: add netlink APIs for smartMAC configuration 2014-02-17 16:42:39 -05:00
x25.h
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x25device.h
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xfrm.h xfrm: Remove useless xfrm_audit struct. 2014-04-23 08:21:04 +02:00