From patchwork Wed Oct 8 14:05:07 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Graf X-Patchwork-Id: 3320 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by ozlabs.org (Postfix) with ESMTP id 28F4BDE372 for ; Thu, 9 Oct 2008 01:04:55 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754230AbYJHOEu (ORCPT ); Wed, 8 Oct 2008 10:04:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754142AbYJHOEu (ORCPT ); Wed, 8 Oct 2008 10:04:50 -0400 Received: from postel.suug.ch ([194.88.212.233]:39721 "EHLO postel.suug.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754065AbYJHOEt (ORCPT ); Wed, 8 Oct 2008 10:04:49 -0400 Received: by postel.suug.ch (Postfix, from userid 10001) id F35881C31D; Wed, 8 Oct 2008 16:05:07 +0200 (CEST) Date: Wed, 8 Oct 2008 16:05:07 +0200 From: Thomas Graf To: Chei-yol Kim Cc: netdev@vger.kernel.org Subject: Re: [RFC] Control Group Classifier Message-ID: <20081008140507.GV20815@postel.suug.ch> References: <20080908115101.GE20815@postel.suug.ch> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org * Chei-yol Kim 2008-10-08 07:02 > Thomas Graf suug.ch> writes: > > > > > This patch implements a very basic cgroup subsystem which allows > > assigning classids to cgroups. It also adds a trivial classifier > > to filter packets based on that classid and map them to classes. > > > > The classifier should cover the most common use case and will work > > without any configuration. Additionaly it might make sense to add > > a cgroup meta ematch to allow for more sophisticated setups. > > > > I've taken over the idea of inheriting the classid of cgroup parents > > from the patchset posted by Ranjit Manomohan google.com>. > > > > Comments welcome. > > > > Hello > I've done your patch to kernel-2.6.27-rc7. > Then I've got much of fails of compiling kernel. > What is your base kernel of this patch? > If there are any other patchs or programs for using your net_cls class, > Would you let me know? The patch is based on the net-2.6.-next tree. However, the patch contains an error which prevents it from working correctly. Attached is an updated patch which I'm currently testing. You have to remove the debugging printks though :-) --- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: net-2.6-next/include/linux/cgroup_subsys.h =================================================================== --- net-2.6-next.orig/include/linux/cgroup_subsys.h 2008-10-07 12:24:40.000000000 +0200 +++ net-2.6-next/include/linux/cgroup_subsys.h 2008-10-07 12:25:54.000000000 +0200 @@ -48,3 +48,9 @@ #endif /* */ + +#ifdef CONFIG_NET_CLS_CGROUP +SUBSYS(net_cls) +#endif + +/* */ Index: net-2.6-next/include/linux/pkt_cls.h =================================================================== --- net-2.6-next.orig/include/linux/pkt_cls.h 2008-10-07 12:24:40.000000000 +0200 +++ net-2.6-next/include/linux/pkt_cls.h 2008-10-07 12:25:54.000000000 +0200 @@ -394,6 +394,20 @@ #define TCA_BASIC_MAX (__TCA_BASIC_MAX - 1) + +/* Cgroup classifier */ + +enum +{ + TCA_CGROUP_UNSPEC, + TCA_CGROUP_ACT, + TCA_CGROUP_POLICE, + TCA_CGROUP_EMATCHES, + __TCA_CGROUP_MAX, +}; + +#define TCA_CGROUP_MAX (__TCA_CGROUP_MAX - 1) + /* Extended Matches */ struct tcf_ematch_tree_hdr Index: net-2.6-next/net/sched/Kconfig =================================================================== --- net-2.6-next.orig/net/sched/Kconfig 2008-10-07 12:24:40.000000000 +0200 +++ net-2.6-next/net/sched/Kconfig 2008-10-07 12:25:54.000000000 +0200 @@ -316,6 +316,17 @@ To compile this code as a module, choose M here: the module will be called cls_flow. +config NET_CLS_CGROUP + tristate "Control Group Classifier" + select NET_CLS + depends on CGROUPS + ---help--- + Say Y here if you want to classify packets based on the control + cgroup of their process. + + To compile this code as a module, choose M here: the + module will be called cls_cgroup. + config NET_EMATCH bool "Extended Matches" select NET_CLS Index: net-2.6-next/net/sched/Makefile =================================================================== --- net-2.6-next.orig/net/sched/Makefile 2008-10-07 12:24:40.000000000 +0200 +++ net-2.6-next/net/sched/Makefile 2008-10-07 12:25:54.000000000 +0200 @@ -38,6 +38,7 @@ obj-$(CONFIG_NET_CLS_RSVP6) += cls_rsvp6.o obj-$(CONFIG_NET_CLS_BASIC) += cls_basic.o obj-$(CONFIG_NET_CLS_FLOW) += cls_flow.o +obj-$(CONFIG_NET_CLS_CGROUP) += cls_cgroup.o obj-$(CONFIG_NET_EMATCH) += ematch.o obj-$(CONFIG_NET_EMATCH_CMP) += em_cmp.o obj-$(CONFIG_NET_EMATCH_NBYTE) += em_nbyte.o Index: net-2.6-next/net/sched/cls_cgroup.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ net-2.6-next/net/sched/cls_cgroup.c 2008-10-07 12:25:54.000000000 +0200 @@ -0,0 +1,293 @@ +/* + * net/sched/cls_cgroup.c Control Group Classifier + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Thomas Graf + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct cgroup_cls_state +{ + struct cgroup_subsys_state css; + u32 classid; +}; + +static inline struct cgroup_cls_state *net_cls_state(struct cgroup *cgrp) +{ + return (struct cgroup_cls_state *) + cgroup_subsys_state(cgrp, net_cls_subsys_id); +} + +static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss, + struct cgroup *cgrp) +{ + struct cgroup_cls_state *cs; + + printk("cgrp_create ss=%p, cgrp=%p\n", ss, cgrp); + + if (!(cs = kzalloc(sizeof(*cs), GFP_KERNEL))) + return ERR_PTR(-ENOMEM); + + if (cgrp->parent) + cs->classid = net_cls_state(cgrp->parent)->classid; + + return &cs->css; +} + +static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp) +{ + printk("cgrp_destroy\n"); + kfree(ss); +} + +static u64 read_classid(struct cgroup *cgrp, struct cftype *cft) +{ + printk("read_classid cgrp=%p, cft=%p -> %u\n", cgrp, cft, + net_cls_state(cgrp)->classid); + return net_cls_state(cgrp)->classid; +} + +static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value) +{ + printk("write_classid cgrp=%p, cft=%p, value=%llu\n", cgrp, cft, value); + + if (!cgroup_lock_live_group(cgrp)) + return -ENODEV; + + net_cls_state(cgrp)->classid = (u32) value; + + cgroup_unlock(); + + return 0; +} + +static struct cftype ss_files[] = { + { + .name = "classid", + .read_u64 = read_classid, + .write_u64 = write_classid, + }, +}; + +static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp) +{ + printk("cgrp_populate ss=%p, cgrp=%p\n", ss, cgrp); + return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files)); +} + +struct cgroup_subsys net_cls_subsys = { + .name = "net_cls", + .create = cgrp_create, + .destroy = cgrp_destroy, + .populate = cgrp_populate, + .subsys_id = net_cls_subsys_id, +}; + +struct cls_cgroup_head +{ + u32 handle; + struct tcf_exts exts; + struct tcf_ematch_tree ematches; +}; + +static int cls_cgroup_classify(struct sk_buff *skb, struct tcf_proto *tp, + struct tcf_result *res) +{ + struct cls_cgroup_head *head = tp->root; + struct cgroup_cls_state *cs; + int ret = 0; + char foo[128]; + + rcu_read_lock(); + + get_task_comm(foo, current); + printk("classify! from pid=%u comm=%s\n", current->pid, foo); + + cs = (struct cgroup_cls_state *) task_subsys_state(current, + net_cls_subsys_id); + if (cs->classid && tcf_em_tree_match(skb, &head->ematches, NULL)) { + printk("has classid=%u\n", cs->classid); + res->classid = cs->classid; + res->class = 0; + ret = tcf_exts_exec(skb, &head->exts, res); + } else + ret = -1; + + rcu_read_unlock(); + + printk("returning %d\n", ret); + + return ret; +} + +static unsigned long cls_cgroup_get(struct tcf_proto *tp, u32 handle) +{ + return 0UL; +} + +static void cls_cgroup_put(struct tcf_proto *tp, unsigned long f) +{ +} + +static int cls_cgroup_init(struct tcf_proto *tp) +{ + return 0; +} + +static const struct tcf_ext_map cgroup_ext_map = { + .action = TCA_CGROUP_ACT, + .police = TCA_CGROUP_POLICE, +}; + +static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = { + [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED }, +}; + +static int cls_cgroup_change(struct tcf_proto *tp, unsigned long base, + u32 handle, struct nlattr **tca, + unsigned long *arg) +{ + struct nlattr *tb[TCA_CGROUP_MAX+1]; + struct cls_cgroup_head *head = tp->root; + struct tcf_ematch_tree t; + struct tcf_exts e; + int err; + + if (head == NULL) { + if (!handle) + return -EINVAL; + + head = kzalloc(sizeof(*head), GFP_KERNEL); + if (head == NULL) + return -ENOBUFS; + + head->handle = handle; + + tcf_tree_lock(tp); + tp->root = head; + tcf_tree_unlock(tp); + } + + if (handle != head->handle) + return -ENOENT; + + err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS], + cgroup_policy); + if (err < 0) + return err; + + err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &cgroup_ext_map); + if (err < 0) + return err; + + err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t); + if (err < 0) + return err; + + tcf_exts_change(tp, &head->exts, &e); + tcf_em_tree_change(tp, &head->ematches, &t); + + return 0; +} + +static void cls_cgroup_destroy(struct tcf_proto *tp) +{ + struct cls_cgroup_head *head; + + head = (struct cls_cgroup_head *)xchg(&tp->root, NULL); + + if (head) { + tcf_exts_destroy(tp, &head->exts); + tcf_em_tree_destroy(tp, &head->ematches); + kfree(head); + } +} + +static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg) +{ + return -EOPNOTSUPP; +} + +static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg) +{ + struct cls_cgroup_head *head = tp->root; + + if (arg->count < arg->skip) + goto skip; + + if (arg->fn(tp, (unsigned long) head, arg) < 0) { + arg->stop = 1; + return; + } +skip: + arg->count++; +} + +static int cls_cgroup_dump(struct tcf_proto *tp, unsigned long fh, + struct sk_buff *skb, struct tcmsg *t) +{ + struct cls_cgroup_head *head = tp->root; + unsigned char *b = skb_tail_pointer(skb); + struct nlattr *nest; + + t->tcm_handle = head->handle; + + nest = nla_nest_start(skb, TCA_OPTIONS); + if (nest == NULL) + goto nla_put_failure; + + if (tcf_exts_dump(skb, &head->exts, &cgroup_ext_map) < 0 || + tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + if (tcf_exts_dump_stats(skb, &head->exts, &cgroup_ext_map) < 0) + goto nla_put_failure; + + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { + .kind = "cgroup", + .init = cls_cgroup_init, + .change = cls_cgroup_change, + .classify = cls_cgroup_classify, + .destroy = cls_cgroup_destroy, + .get = cls_cgroup_get, + .put = cls_cgroup_put, + .delete = cls_cgroup_delete, + .walk = cls_cgroup_walk, + .dump = cls_cgroup_dump, + .owner = THIS_MODULE, +}; + +static int __init init_cgroup_cls(void) +{ + return register_tcf_proto_ops(&cls_cgroup_ops); +} + +static void __exit exit_cgroup_cls(void) +{ + unregister_tcf_proto_ops(&cls_cgroup_ops); +} + +module_init(init_cgroup_cls); +module_exit(exit_cgroup_cls); +MODULE_LICENSE("GPL");