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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>		15 years ago
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Kconfig	cgroups: net_cls as module	15 years ago
Makefile	net_sched: add classful multiqueue dummy scheduler	16 years ago
act_api.c	net sched: printk message severity	15 years ago
act_gact.c	net sched: printk message severity	15 years ago
act_ipt.c	net sched: printk message severity	15 years ago
act_mirred.c	net sched: printk message severity	15 years ago
act_nat.c	tc: propogate errors from tcf_hash_create	16 years ago
act_pedit.c	net sched: printk message severity	15 years ago
act_police.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
act_simple.c	net sched: printk message severity	15 years ago
act_skbedit.c	pkt_sched: skbedit add support for setting mark	16 years ago
cls_api.c	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	15 years ago
cls_basic.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
cls_cgroup.c	cls_cgroup: Store classid in struct sock	15 years ago
cls_flow.c	net: Remove unnecessary returns from void function()s	15 years ago
cls_fw.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
cls_route.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
cls_rsvp.c	…
cls_rsvp.h	net: Move && and || to end of previous line	15 years ago
cls_rsvp6.c	…
cls_tcindex.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
cls_u32.c	net sched: printk message severity	15 years ago
em_cmp.c	net: em_cmp.c use unaligned access helpers	17 years ago
em_meta.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
em_nbyte.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
em_text.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
em_u32.c	[PKT_SCHED]: annotate cls_u32	17 years ago
ematch.c	net sched: printk message severity	15 years ago
sch_api.c	net_sched: Fix qdisc_notify()	15 years ago
sch_atm.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_blackhole.c	pkt_sched: Add qdisc->ops->peek() implementation.	17 years ago
sch_cbq.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_drr.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_dsmark.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_fifo.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_generic.c	net: add a noref bit on skb dst	15 years ago
sch_gred.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_hfsc.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_htb.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_ingress.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_mq.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_multiq.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_netem.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sch_prio.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_red.c	net: Remove unnecessary returns from void function()s	15 years ago
sch_sfq.c	net: Fix various endianness glitches	15 years ago
sch_tbf.c	tbf: stop wanton destruction of children (v2)	15 years ago
sch_teql.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago