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linux/include/net
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Hannes Frederic Sowa df4d92549f ipv4: try to cache dst_entries which would cause a redirect 
Not caching dst_entries which cause redirects could be exploited by hosts
on the same subnet, causing a severe DoS attack. This effect aggravated
since commit f88649721268999 ("ipv4: fix dst race in sk_dst_get()").

Lookups causing redirects will be allocated with DST_NOCACHE set which
will force dst_release to free them via RCU.  Unfortunately waiting for
RCU grace period just takes too long, we can end up with >1M dst_entries
waiting to be released and the system will run OOM. rcuos threads cannot
catch up under high softirq load.

Attaching the flag to emit a redirect later on to the specific skb allows
us to cache those dst_entries thus reducing the pressure on allocation
and deallocation.

This issue was discovered by Marcelo Leitner.

Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Marcelo Leitner <mleitner@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-26 17:28:27 -08:00
..
9p
net/9p: remove a comment about pref member which doesn't exist
2014-11-06 14:59:19 -05:00
bluetooth
Merge branch 'for-davem-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-12-10 13:17:23 -05:00
caif
caif_hsi.h: Remove extern from function prototypes
2013-09-23 16:29:41 -04:00
irda
irda: Convert function pointer arrays and uses to const
2014-12-10 15:33:16 -05:00
iucv
…
netfilter
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2014-12-11 14:27:06 -08:00
netns
xfrm: Do not hash socket policies
2014-11-13 11:25:03 +01:00
nfc
NFC: hci: Add specific hci macro to not create a pipe
2014-12-02 22:48:13 +01:00
phonet
…
sctp
switch sctp_user_addto_chunk() and sctp_datamsg_from_user() to passing iov_iter
2014-11-24 05:16:40 -05:00
tc_act
tc_vlan: fix type of tcfv_push_vid
2014-11-24 16:12:03 -05:00
6lowpan.h
ieee802154: 6lowpan: rename process_data and lowpan_process_data
2014-10-27 15:51:16 +01:00
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: mac802154: remove FSF address
2014-10-25 08:07:30 +02:00
af_rxrpc.h
af_rxrpc.h: Remove extern from function prototypes
2013-07-31 17:50:01 -07:00
af_unix.h
af_unix: improve STREAM behavior with fragmented memory
2013-08-10 01:16:44 -07:00
af_vsock.h
vmci_transport: switch ->enqeue_dgram, ->enqueue_stream and ->dequeue_stream to msghdr
2014-11-24 05:16:42 -05:00
ah.h
ipsec: Remove obsolete MAX_AH_AUTH_LEN
2014-09-18 10:54:36 +02:00
arp.h
arp: make arp_invalidate static
2013-12-28 17:02:46 -05:00
atmclip.h
…
ax25.h
ax25.h: Remove extern from function prototypes
2013-07-31 17:50:02 -07:00
ax88796.h
…
bond_3ad.h
net: Move bonding headers under include/net
2014-11-10 13:27:49 -05:00
bond_alb.h
net: Move bonding headers under include/net
2014-11-10 13:27:49 -05:00
bond_options.h
net: Move bonding headers under include/net
2014-11-10 13:27:49 -05:00
bonding.h
net: Move bonding headers under include/net
2014-11-10 13:27:49 -05:00
busy_poll.h
sched, net: Fixup busy_loop_us_clock()
2014-01-13 17:39:11 +01:00
cfg80211-wext.h
…
cfg80211.h
cfg80211: clean up beacon loss CQM event
2014-11-26 20:56:42 +01:00
cfg802154.h
ieee802154: fix byteorder for short address and panid
2014-11-17 09:49:17 +01:00
checksum.h
net: Add remcsum_adjust as common function for remote checksum offload
2014-11-26 12:25:43 -05:00
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
fold verify_iovec() into copy_msghdr_from_user()
2014-11-19 16:23:49 -05:00
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_dev.h
dn_dev: add support for IFA_FLAGS nl attribute
2013-12-10 21:50:00 -05:00
dn_fib.h
decnet (dn*.h): Remove extern from function prototypes
2013-09-20 14:49:32 -04:00
dn_neigh.h
decnet (dn*.h): Remove extern from function prototypes
2013-09-20 14:49:32 -04:00
dn_nsp.h
decnet (dn*.h): Remove extern from function prototypes
2013-09-20 14:49:32 -04:00
dn_route.h
net: Move prototype declaration to appropriate header file from decnet/af_decnet.c
2014-02-09 17:32:49 -08:00
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
dsa.h
net: dsa: Add support for reading switch registers with ethtool
2014-10-30 14:54:11 -04:00
dsfield.h
…
dst_ops.h
percpu_counter: add @gfp to percpu_counter_init()
2014-09-08 09:51:29 +09:00
dst.h
xfrm: Generate queueing routes only from route lookup functions
2014-09-16 10:08:49 +02:00
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
fib_rules.h: Remove extern from function prototypes
2013-09-20 14:49:33 -04:00
firewire.h
…
flow_keys.h
net: Add function for parsing the header length out of linear ethernet frames
2014-09-05 17:47:02 -07:00
flow.h
ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif
2014-04-16 15:05:11 -04:00
flowcache.h
flowcache: Make flow cache name space aware
2014-02-12 07:02:11 +01:00
fou.h
ip_tunnel: Ops registration for secondary encap (fou, gue)
2014-11-12 15:01:35 -05:00
garp.h
garp.h: Remove extern from function prototypes
2013-09-20 14:49:33 -04:00
gen_stats.h
net: sched: enable per cpu qstats
2014-09-30 01:02:26 -04:00
genetlink.h
genetlink: synchronize socket closing and family removal
2015-01-16 17:04:25 -05:00
geneve.h
openvswitch: fix a compilation error when CONFIG_INET is not setW!
2014-10-07 00:10:49 -04:00
gre.h
gre: Call gso_make_checksum
2014-06-04 22:46:38 -07:00
gro_cells.h
…
gue.h
gue: Protocol constants for remote checksum offload
2014-11-05 16:30:03 -05:00
icmp.h
icmp.h: Remove extern from function prototypes
2013-09-20 14:49:33 -04:00
ieee80211_radiotap.h
mac80211: propagate STBC / LDPC flags to radiotap
2014-02-06 09:34:58 +01:00
ieee802154_netdev.h
ieee802154: remove mlme get_phy callback
2014-11-05 21:53:04 +01:00
if_inet6.h
ipv6: remove aca_lock spinlock from struct ifacaddr6
2014-10-14 13:15:15 -04:00
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: move INET6_MATCH() to include/net/inet6_hashtables.h
2014-11-05 16:59:04 -05:00
inet_common.h
net-timestamp: make tcp_recvmsg call ipv6_recv_error for AF_INET6 socks
2014-11-26 15:45:04 -05:00
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
percpu_counter: add @gfp to percpu_counter_init()
2014-09-08 09:51:29 +09:00
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
ip6_checksum.h
net: add gro_compute_pseudo functions
2014-08-24 18:09:23 -07:00
ip6_fib.h
ipv6: make rt_sernum atomic and serial number fields ordinary ints
2014-10-07 00:02:30 -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
ipv6: Allow sending packets through tunnels with wildcard endpoints
2014-11-06 14:19:19 -05:00
ip_fib.h
fib_trie: Fix /proc/net/fib_trie when CONFIG_IP_MULTIPLE_TABLES is not defined
2014-12-08 21:14:32 -05:00
ip_tunnels.h
ip_tunnel: Ops registration for secondary encap (fou, gue)
2014-11-12 15:01:35 -05:00
ip_vs.h
ipvs: Clean up comment style in ip_vs.h
2014-10-02 18:30:58 +02:00
ip.h
ipv4: try to cache dst_entries which would cause a redirect
2015-01-26 17:28:27 -08:00
ipcomp.h
…
ipconfig.h
…
ipv6.h
drivers/net, ipv6: Select IPv6 fragment idents for virtio UFO packets
2014-10-30 20:01:18 -04:00
ipx.h
switch ipxrtr_route_packet() from iovec to msghdr
2014-11-24 04:28:49 -05:00
iw_handler.h
iw_handler.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
lapb.h
lapb.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
lib80211.h
lib80211: remove unused print_ssid()
2014-10-14 02:18:27 +02:00
llc_c_ac.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_c_ev.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_c_st.h
llc: Make llc_conn_ev_qfyr_t function pointer arrays const
2014-12-10 15:21:24 -05:00
llc_conn.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_if.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
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
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_s_ev.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_s_st.h
llc: Make llc_sap_action_t function pointer arrays const
2014-12-10 15:21:24 -05:00
llc_sap.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc.h
llc: make lock static
2014-01-03 20:56:48 -05:00
mac80211.h
Revert "mac80211: Fix accounting of the tailroom-needed counter"
2015-01-05 10:33:46 +01:00
mac802154.h
mac802154: add interframe spacing time handling
2014-11-13 04:51:58 +01:00
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
mpls.h
openvswitch: Add basic MPLS support to kernel
2014-11-05 23:52:33 -08:00
mrp.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2013-10-01 17:06:14 -04:00
ndisc.h
ndisc.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
neighbour.h
neigh: remove next ptr from struct neigh_table
2014-12-26 17:07:08 -05:00
net_namespace.h
common object embedded into various struct ....ns
2014-12-04 14:31:00 -05:00
net_ratelimit.h
…
netevent.h
netevent/netlink.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
netlabel.h
netlabel: fix the netlbl_catmap_setlong() dummy function
2014-08-07 20:55:21 -04:00
netlink.h
datapath: Rename last_action() as nla_is_last() and move to netlink.h
2014-10-28 17:07:29 -04:00
netprio_cgroup.h
cgroup: clean up cgroup_subsys names and initialization
2014-02-08 10:36:58 -05:00
netrom.h
netrom.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
nexthop.h
…
nl802154.h
ieee802154: add new nl802154 header
2014-11-09 19:50:28 +01:00
p8022.h
p8022.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
ping.h
icmp: Remove some spurious dropped packet profile hits from the ICMP path
2014-11-18 15:28:28 -05:00
pkt_cls.h
net: sched: remove tcf_proto from ematch calls
2014-10-06 18:02:32 -04:00
pkt_sched.h
net: sched: avoid costly atomic operation in fq_dequeue()
2014-10-06 00:55:10 -04:00
protocol.h
net: Eliminate no_check from protosw
2014-05-23 16:28:53 -04:00
psnap.h
psnap.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
raw.h
raw/rawv6.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
rawv6.h
raw/rawv6.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
red.h
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
regulatory.h
cfg80211: leave invalid channels on regdomain change
2014-11-28 14:33:41 +01:00
request_sock.h
inet: includes a sock_common in request_sock
2013-10-10 00:08:07 -04:00
rose.h
rose.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
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
net: sched: cls: remove unused op put from tcf_proto_ops
2014-12-09 14:49:02 -05:00
scm.h
scm.h: Remove extern from function prototypes
2013-09-23 01:51:09 -04:00
secure_seq.h
inetpeer: get rid of ip_id_count
2014-06-02 11:00:41 -07:00
slhc_vj.h
…
snmp.h
Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2014-10-15 07:48:18 +02:00
sock.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2014-12-13 13:33:26 -08:00
Space.h
drivers: net: Include new header file in sbni.c
2013-12-19 18:51:20 -05:00
stp.h
stp.h: Remove extern from function prototypes
2013-09-23 01:51:09 -04:00
switchdev.h
bridge: call netdev_sw_port_stp_update when bridge port STP status changes
2014-12-02 20:01:22 -08:00
tcp_memcontrol.h
tcp_memcontrol: Kill struct tcp_memcontrol
2013-10-21 18:43:02 -04:00
tcp_states.h
…
tcp.h
net: allow setting ecn via routing table
2014-11-04 16:06:09 -05:00
timewait_sock.h
…
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_tunnel.h
udptunnel: Add SKB_GSO_UDP_TUNNEL during gro_complete.
2014-11-10 15:09:45 -05:00
udp.h
udp: Generalize skb_udp_segment
2014-10-01 21:35:51 -04:00
udplite.h
put iov_iter into msghdr
2014-12-09 16:29:03 -05:00
vsock_addr.h
VSOCK: Move af_vsock.h and vsock_addr.h to include/net
2013-07-27 22:14:06 -07:00
vxlan.h
net: Generalize ndo_gso_check to ndo_features_check
2014-12-26 17:20:56 -05:00
wext.h
wext.h: Remove extern from function prototypes
2013-09-23 16:29:40 -04:00
wimax.h
net: treewide: Fix typo found in DocBook/networking.xml
2014-09-05 17:35:28 -07:00
x25.h
x25.h: Remove extern from function prototypes
2013-09-23 16:29:41 -04:00
x25device.h
…
xfrm.h
xfrm: configure policy hash table thresholds by netlink
2014-09-02 13:37:56 +02:00