Herbert Xu f845172531 cls_cgroup: Store classid in struct sock ... Up until now cls_cgroup has relied on fetching the classid out of the current executing thread. This runs into trouble when a packet processing is delayed in which case it may execute out of another thread's context. Furthermore, even when a packet is not delayed we may fail to classify it if soft IRQs have been disabled, because this scenario is indistinguishable from one where a packet unrelated to the current thread is processed by a real soft IRQ. In fact, the current semantics is inherently broken, as a single skb may be constructed out of the writes of two different tasks. A different manifestation of this problem is when the TCP stack transmits in response of an incoming ACK. This is currently unclassified. As we already have a concept of packet ownership for accounting purposes in the skb->sk pointer, this is a natural place to store the classid in a persistent manner. This patch adds the cls_cgroup classid in struct sock, filling up an existing hole on 64-bit :) The value is set at socket creation time. So all sockets created via socket(2) automatically gains the ID of the thread creating it. Whenever another process touches the socket by either reading or writing to it, we will change the socket classid to that of the process if it has a valid (non-zero) classid. For sockets created on inbound connections through accept(2), we inherit the classid of the original listening socket through sk_clone, possibly preceding the actual accept(2) call. In order to minimise risks, I have not made this the authoritative classid. For now it is only used as a backup when we execute with soft IRQs disabled. Once we're completely happy with its semantics we can use it as the sole classid. Footnote: I have rearranged the error path on cls_group module creation. If we didn't do this, then there is a window where someone could create a tc rule using cls_group before the cgroup subsystem has been registered. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>		2010-05-24 00:12:34 -07:00
..
9p	9p: Make sure we are able to clunk the cached fid on umount	2010-04-05 10:37:36 -05:00
bluetooth	Bluetooth: Create per controller workqueue	2010-05-10 09:34:03 +02:00
caif	caif: Bugfix - use standard Linux lists	2010-05-23 23:57:41 -07:00
irda	tree-wide: fix typos "ass?o[sc]iac?te" -> "associate" in comments	2010-02-15 15:38:10 +01:00
iucv	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
netfilter	netfilter: nf_conntrack: fix a race in __nf_conntrack_confirm against nf_ct_get_next_corpse()	2010-05-20 15:55:30 +02:00
netns	ipv6: ip6mr: support multiple tables	2010-05-11 14:40:55 +02:00
phonet	Phonet: zero-copy GPRS TX	2010-01-07 00:24:55 -08:00
sctp	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-05-12 00:05:35 -07:00
tc_act	pkt_sched: skbedit add support for setting mark	2009-10-22 21:56:42 -07:00
tipc	tipc: Update commenting in TIPC API	2010-05-12 23:02:23 -07:00
act_api.h	net: restore gnet_stats_basic to previous definition	2009-08-17 21:33:49 -07:00
addrconf.h	net: Add checking to rcu_dereference() primitives	2010-02-25 09:41:03 +01:00
af_ieee802154.h	af_ieee802154: add support for WANT_ACK socket option	2009-08-12 21:54:50 -07:00
af_rxrpc.h
af_unix.h	net: sock_def_readable() and friends RCU conversion	2010-05-01 15:00:15 -07:00
ah.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
arp.h	net: make neigh_ops constant	2009-09-01 17:40:57 -07:00
atmclip.h	clip: convert to internal network_device_stats	2009-01-21 14:01:59 -08:00
ax25.h	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ax88796.h	ax88796: Add method to take MAC from platform data	2009-03-24 23:32:03 -07:00
cfg80211.h	cfg80211/mac80211: better channel handling	2010-05-07 14:55:50 -04:00
checksum.h	include/net net/ - csum_partial - remove unnecessary casts	2008-11-19 15:44:53 -08:00
cipso_ipv4.h	netlabel: Label incoming TCP connections correctly in SELinux	2009-03-28 15:01:36 +11:00
cls_cgroup.h	cls_cgroup: Store classid in struct sock	2010-05-24 00:12:34 -07:00
compat.h	net: fix compat_sys_recvmmsg parameter type	2009-12-11 15:07:56 -08:00
datalink.h
dcbnl.h	dcbnl: Add support for setapp/getapp to netdev dcbnl_rtnl_ops	2009-09-01 01:24:30 -07:00
dn_dev.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-12-08 07:55:01 -08:00
dn_fib.h	decnet: Remove unused FIB metric macros.	2010-03-27 19:23:46 -07:00
dn_neigh.h
dn_nsp.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
dn_route.h
dn.h	decnet: compile fix for removal of byteorder wrapper	2008-11-27 23:04:13 -08:00
dsa.h	dsa: add switch chip cascading support	2009-03-21 19:06:54 -07:00
dsfield.h
dst_ops.h	netns: embed ip6_dst_ops directly	2009-09-01 17:40:31 -07:00
dst.h	net: Introduce skb_tunnel_rx() helper	2010-05-17 22:36:55 -07:00
esp.h
ethoc.h	net: Add support for the OpenCores 10/100 Mbps Ethernet MAC.	2009-03-27 00:16:21 -07:00
fib_rules.h	net: fib_rules: mark arguments to fib_rules_register const and __net_initdata	2010-04-26 16:02:04 +02:00
flow.h	flow: virtualize flow cache entry methods	2010-04-07 03:43:18 -07:00
garp.h
gen_stats.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
genetlink.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
icmp.h	ipv4: raw: move struct raw_sock and raw_sk() to include/net/raw.h	2010-04-13 14:49:31 -07:00
ieee80211_radiotap.h	wireless: update radiotap parser	2010-02-08 16:50:53 -05:00
ieee802154_netdev.h	ieee802154: add an mlme_ops call to retrieve PHY object	2009-11-06 14:32:18 +03:00
ieee802154.h	ieee802154: move headers out of extra directory	2009-07-23 17:08:51 +04:00
if_inet6.h	ipv6: Replace inet6_ifaddr->dead with state	2010-05-18 15:36:06 -07:00
inet6_connection_sock.h	net: replace ipfragok with skb->local_df	2010-04-15 23:36:37 -07:00
inet6_hashtables.h	tcp: Fix a connect() race with timewait sockets	2009-12-08 20:17:51 -08:00
inet_common.h
inet_connection_sock.h	net: replace ipfragok with skb->local_df	2010-04-15 23:36:37 -07:00
inet_ecn.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
inet_frag.h	inet fragments: fix sparse warning: context imbalance	2009-02-26 23:13:35 -08:00
inet_hashtables.h	tcp: Fix a connect() race with timewait sockets	2009-12-08 20:17:51 -08:00
inet_sock.h	net: Make RFS socket operations not be inet specific.	2010-04-27 15:11:48 -07:00
inet_timewait_sock.h	net: suppress RCU lockdep false positive in twsk_net()	2010-04-27 12:39:01 -07:00
inetpeer.h	inetpeer: Optimize inet_getid()	2009-11-13 20:46:58 -08:00
ip6_checksum.h
ip6_fib.h	ipv6 fib: Make rt6_info{} more cache-line aware.	2010-04-01 18:41:41 -07:00
ip6_route.h	net: sk_dst_cache RCUification	2010-04-13 01:41:33 -07:00
ip6_tunnel.h	ipv6 ip6_tunnel: eliminate unused recursion field from ip6_tnl{}.	2010-03-10 07:32:29 -08:00
ip_fib.h	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2009-11-06 00:55:55 -08:00
ip_vs.h	ipvs: SCTP Trasport Loadbalancing Support	2010-02-18 12:31:05 +01:00
ip.h	net: reserve ports for applications using fixed port numbers	2010-05-15 23:28:40 -07:00
ipcomp.h	percpu: add __percpu sparse annotations to net	2010-02-16 23:05:38 -08:00
ipconfig.h
ipip.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
ipv6.h	IPv6: Complete IPV6_DONTFRAG support	2010-04-23 23:35:29 -07:00
ipx.h	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
iw_handler.h	include/net/iw_handler.h: Use SIOCIWFIRST not SIOCSIWCOMMIT in comment	2010-03-31 14:49:12 -04:00
lapb.h
lib80211.h	wireless: missing include in lib80211.h	2008-11-21 11:42:55 -05:00
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h	llc: use a device based hash table to speed up multicast delivery	2009-12-26 20:43:57 -08:00
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h	llc: convert llc_sap_list to RCU	2009-12-26 20:46:28 -08:00
mac80211.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem	2010-05-17 13:57:43 -04:00
mip6.h
mld.h	ipv6 mcast: Introduce include/net/mld.h for MLD definitions.	2010-04-23 13:35:55 +09:00
ndisc.h	sysctl: remove "struct file *" argument of ->proc_handler	2009-09-24 07:21:04 -07:00
neighbour.h	netfilter: bridge-netfilter: Fix MAC header handling with IP DNAT	2010-04-15 12:26:39 +02:00
net_namespace.h	nsproxy: remove INIT_NSPROXY()	2010-03-12 15:52:40 -08:00
netdma.h	net_dma: convert to dma_find_channel	2009-01-06 11:38:15 -07:00
netevent.h
netlabel.h	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
netlink.h	netlink: fix unaligned access in nla_get_be64()	2010-03-19 22:47:23 -07:00
netrom.h	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
nexthop.h
nl802154.h	ieee802154: add support for channel pages from IEEE 802.15.4-2006	2009-08-19 23:08:22 +04:00
p8022.h
pkt_cls.h	net: rename skb->iif to skb->skb_iif	2009-11-20 15:35:04 -08:00
pkt_sched.h	gen_estimator: deadlock fix	2010-04-01 18:38:48 -07:00
protocol.h	net: drop capability from protocol definitions	2009-11-05 21:40:17 -08:00
psnap.h	snap: use const for descriptor	2009-03-21 19:06:50 -07:00
raw.h	ipv4: ipmr: support multiple tables	2010-04-13 14:49:34 -07:00
rawv6.h	ipv6: Use correct data types for ICMPv6 type and code	2009-06-23 04:31:07 -07:00
red.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
regulatory.h	cfg80211: add regulatory hint disconnect support	2010-02-01 15:40:06 -05:00
request_sock.h	tcp: account SYN-ACK timeouts & retransmissions	2010-01-17 19:09:39 -08:00
rose.h	NET: ROSE: Don't use static buffer.	2009-07-26 19:11:14 -07:00
route.h	net: implements ip_route_input_noref()	2010-05-17 17:18:51 -07:00
rtnetlink.h	rtnetlink: support specifying device flags on device creation	2010-02-27 02:43:40 -08:00
sch_generic.h	gen_estimator: deadlock fix	2010-04-01 18:38:48 -07:00
scm.h	net: cleanup include/net	2009-11-04 05:06:25 -08:00
slhc_vj.h
snmp.h	tcp: fix outsegs stat for TSO segments	2010-04-22 16:00:00 -07:00
sock.h	cls_cgroup: Store classid in struct sock	2010-05-24 00:12:34 -07:00
stp.h
tcp_states.h
tcp.h	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-05-16 22:26:58 -07:00
timewait_sock.h	net: Fix memory leak in the proto_register function	2008-11-21 16:45:22 -08:00
transp_v6.h	IPv6: Add dontfrag argument to relevant functions	2010-04-23 23:35:28 -07:00
udp.h	udp: bind() optimisation	2009-11-10 20:54:38 -08:00
udplite.h	udp: introduce struct udp_table and multiple spinlocks	2008-10-29 01:41:45 -07:00
wext.h	wext: refactor	2009-10-07 16:39:43 -04:00
wimax.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-12-09 19:43:33 -08:00
wpan-phy.h	ieee802154: add support for creation/removal of logic interfaces	2009-11-06 14:32:24 +03:00
x25.h	X25: Move accept approve flag to bitfield	2010-05-17 17:39:27 -07:00
x25device.h	X25: Add if_x25.h and x25 to device identifiers	2010-04-22 16:12:36 -07:00
xfrm.h	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00