mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 18:53:52 +08:00
2f7ef2f879
When actions are attached to a filter, they are a part of the filter itself, so when changing a filter we should allow to overwrite the actions inside as well. In my specific case, when I tried to _append_ a new action to an existing filter which already has an action, I got EEXIST since kernel refused to overwrite the existing one in kernel. This patch checks if we are changing the filter checking NLM_F_CREATE flag (Sigh, filters don't use NLM_F_REPLACE...) and then passes the boolean down to actions. This fixes the problem above. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Cong Wang <cwang@twopensource.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
223 lines
5.0 KiB
C
223 lines
5.0 KiB
C
/*
|
|
* 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;
|
|
};
|
|
|
|
static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
|
|
struct tcf_result *res)
|
|
{
|
|
struct cls_cgroup_head *head = tp->root;
|
|
u32 classid;
|
|
|
|
rcu_read_lock();
|
|
classid = task_cls_state(current)->classid;
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Due to the nature of the classifier it is required to ignore all
|
|
* packets originating from softirq context as accessing `current'
|
|
* would lead to false results.
|
|
*
|
|
* This test assumes that all callers of dev_queue_xmit() explicitely
|
|
* disable bh. Knowing this, it is possible to detect softirq based
|
|
* calls by looking at the number of nested bh disable calls because
|
|
* softirqs always disables bh.
|
|
*/
|
|
if (in_serving_softirq()) {
|
|
/* If there is an sk_classid we'll use that. */
|
|
if (!skb->sk)
|
|
return -1;
|
|
classid = skb->sk->sk_classid;
|
|
}
|
|
|
|
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 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 nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = {
|
|
[TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
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 = tp->root;
|
|
struct tcf_ematch_tree t;
|
|
struct tcf_exts e;
|
|
int err;
|
|
|
|
if (!tca[TCA_OPTIONS])
|
|
return -EINVAL;
|
|
|
|
if (head == NULL) {
|
|
if (!handle)
|
|
return -EINVAL;
|
|
|
|
head = kzalloc(sizeof(*head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
return -ENOBUFS;
|
|
|
|
tcf_exts_init(&head->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
|
|
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;
|
|
|
|
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)
|
|
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 = tp->root;
|
|
|
|
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 net *net, 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) < 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:
|
|
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");
|