mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
695176bfe5
TC action ->init() API has 10 parameters, it becomes harder to read. Some of them are just boolean and can be replaced by flags. Similarly for the internal API tcf_action_init() and tcf_exts_validate(). This patch converts them to flags and fold them into the upper 16 bits of "flags", whose lower 16 bits are still reserved for user-space. More specifically, the following kernel flags are introduced: TCA_ACT_FLAGS_POLICE replace 'name' in a few contexts, to distinguish whether it is compatible with policer. TCA_ACT_FLAGS_BIND replaces 'bind', to indicate whether this action is bound to a filter. TCA_ACT_FLAGS_REPLACE replaces 'ovr' in most contexts, means we are replacing an existing action. TCA_ACT_FLAGS_NO_RTNL replaces 'rtnl_held' but has the opposite meaning, because we still hold RTNL in most cases. The only user-space flag TCA_ACT_FLAGS_NO_PERCPU_STATS is untouched and still stored as before. I have tested this patch with tdc and I do not see any failure related to this patch. Tested-by: Vlad Buslov <vladbu@nvidia.com> Acked-by: Jamal Hadi Salim<jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net>
224 lines
5.0 KiB
C
224 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* net/sched/cls_cgroup.c Control Group Classifier
|
|
*
|
|
* 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_work rwork;
|
|
};
|
|
|
|
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 (unlikely(!head))
|
|
return -1;
|
|
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 void *cls_cgroup_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
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(struct cls_cgroup_head *head)
|
|
{
|
|
tcf_exts_destroy(&head->exts);
|
|
tcf_em_tree_destroy(&head->ematches);
|
|
tcf_exts_put_net(&head->exts);
|
|
kfree(head);
|
|
}
|
|
|
|
static void cls_cgroup_destroy_work(struct work_struct *work)
|
|
{
|
|
struct cls_cgroup_head *head = container_of(to_rcu_work(work),
|
|
struct cls_cgroup_head,
|
|
rwork);
|
|
rtnl_lock();
|
|
__cls_cgroup_destroy(head);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
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,
|
|
void **arg, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[TCA_CGROUP_MAX + 1];
|
|
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
|
|
struct cls_cgroup_head *new;
|
|
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;
|
|
|
|
err = tcf_exts_init(&new->exts, net, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
|
|
if (err < 0)
|
|
goto errout;
|
|
new->handle = handle;
|
|
new->tp = tp;
|
|
err = nla_parse_nested_deprecated(tb, TCA_CGROUP_MAX,
|
|
tca[TCA_OPTIONS], cgroup_policy,
|
|
NULL);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, flags,
|
|
extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
rcu_assign_pointer(tp->root, new);
|
|
if (head) {
|
|
tcf_exts_get_net(&head->exts);
|
|
tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
|
|
}
|
|
return 0;
|
|
errout:
|
|
tcf_exts_destroy(&new->exts);
|
|
kfree(new);
|
|
return err;
|
|
}
|
|
|
|
static void cls_cgroup_destroy(struct tcf_proto *tp, bool rtnl_held,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
|
|
|
|
/* Head can still be NULL due to cls_cgroup_init(). */
|
|
if (head) {
|
|
if (tcf_exts_get_net(&head->exts))
|
|
tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
|
|
else
|
|
__cls_cgroup_destroy(head);
|
|
}
|
|
}
|
|
|
|
static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last,
|
|
bool rtnl_held, struct netlink_ext_ack *extack)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg,
|
|
bool rtnl_held)
|
|
{
|
|
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
|
|
|
|
if (arg->count < arg->skip)
|
|
goto skip;
|
|
|
|
if (!head)
|
|
return;
|
|
if (arg->fn(tp, head, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
skip:
|
|
arg->count++;
|
|
}
|
|
|
|
static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
|
|
{
|
|
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
|
|
struct nlattr *nest;
|
|
|
|
t->tcm_handle = head->handle;
|
|
|
|
nest = nla_nest_start_noflag(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");
|