summaryrefslogtreecommitdiffstats
path: root/qemu/tests/qemu-iotests/group
AgeCommit message (Expand)AuthorFilesLines
2016-05-18These changes are the raw update to qemu-2.6.José Pekkarinen1-0/+19
2015-09-01Add qemu 2.4.0Yang Zhang1-0/+136
4'>84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
/*
 * 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 <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/rcupdate.h>
#include <net/rtnetlink.h>
#include <net/pkt_cls.h>
#include <net/sock.h>
#include <net/cls_cgroup.h>

struct cls_cgroup_head {
	u32			handle;
	struct tcf_exts		exts;
	struct tcf_ematch_tree	ematches;
	struct tcf_proto	*tp;
	struct rcu_head		rcu;
};

static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			       struct tcf_result *res)
{
	struct cls_cgroup_head *head = rcu_dereference_bh(tp->root);
	u32 classid = task_get_classid(skb);

	if (!classid)
		return -1;
	if (!tcf_em_tree_match(skb, &head->ematches, NULL))
		return -1;

	res->classid = classid;
	res->class = 0;

	return tcf_exts_exec(skb, &head->exts, res);
}

static unsigned long cls_cgroup_get(struct tcf_proto *tp, u32 handle)
{
	return 0UL;
}

static int cls_cgroup_init(struct tcf_proto *tp)
{
	return 0;
}

static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = {
	[TCA_CGROUP_EMATCHES]	= { .type = NLA_NESTED },
};

static void cls_cgroup_destroy_rcu(struct rcu_head *root)
{
	struct cls_cgroup_head *head = container_of(root,
						    struct cls_cgroup_head,
						    rcu);

	tcf_exts_destroy(&head->exts);
	tcf_em_tree_destroy(&head->ematches);
	kfree(head);
}

static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
			     struct tcf_proto *tp, unsigned long base,
			     u32 handle, struct nlattr **tca,
			     unsigned long *arg, bool ovr)
{
	struct nlattr *tb[TCA_CGROUP_MAX + 1];
	struct cls_cgroup_head *head = rtnl_dereference(tp->root);
	struct cls_cgroup_head *new;
	struct tcf_ematch_tree t;
	struct tcf_exts e;
	int err;

	if (!tca[TCA_OPTIONS])
		return -EINVAL;

	if (!head && !handle)
		return -EINVAL;

	if (head && handle != head->handle)
		return -ENOENT;

	new = kzalloc(sizeof(*head), GFP_KERNEL);
	if (!new)
		return -ENOBUFS;

	tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
	new->handle = handle;
	new->tp = tp;
	err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS],
			       cgroup_policy);
	if (err < 0)
		goto errout;

	tcf_exts_init(&e, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
	if (err < 0)
		goto errout;

	err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t);
	if (err < 0) {
		tcf_exts_destroy(&e);
		goto errout;
	}

	tcf_exts_change(tp, &new->exts, &e);
	tcf_em_tree_change(tp, &new->ematches, &t);

	rcu_assign_pointer(tp->root, new);
	if (head)
		call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
	return 0;
errout:
	kfree(new);
	return err;
}

static bool cls_cgroup_destroy(struct tcf_proto *tp, bool force)
{
	struct cls_cgroup_head *head = rtnl_dereference(tp->root);

	if (!force)
		return false;

	if (head) {
		RCU_INIT_POINTER(tp->root, NULL);
		call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
	}
	return true;
}

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 = rtnl_dereference(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 net *net, struct tcf_proto *tp, unsigned long fh,
			   struct sk_buff *skb, struct tcmsg *t)
{
	struct cls_cgroup_head *head = rtnl_dereference(tp->root);
	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) < 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) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	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,
	.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");