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![Cong Wang](/assets/img/avatar_default.png)
This reverts commit de6fb288b1
.
Otherwise we got:
net/sched/cls_cgroup.c:106:29: error: static declaration of ‘net_cls_subsys’ follows non-static declaration
static struct cgroup_subsys net_cls_subsys = {
^
In file included from include/linux/cgroup.h:654:0,
from net/sched/cls_cgroup.c:18:
include/linux/cgroup_subsys.h:35:29: note: previous declaration of ‘net_cls_subsys’ was here
SUBSYS(net_cls)
^
make[2]: *** [net/sched/cls_cgroup.o] Error 1
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
331 lines
7.3 KiB
C
331 lines
7.3 KiB
C
/*
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* net/sched/cls_cgroup.c Control Group Classifier
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/cgroup.h>
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#include <linux/rcupdate.h>
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#include <linux/fdtable.h>
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#include <net/rtnetlink.h>
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#include <net/pkt_cls.h>
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#include <net/sock.h>
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#include <net/cls_cgroup.h>
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static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css)
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{
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return css ? container_of(css, struct cgroup_cls_state, css) : NULL;
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}
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static inline struct cgroup_cls_state *task_cls_state(struct task_struct *p)
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{
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return css_cls_state(task_css(p, net_cls_subsys_id));
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}
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static struct cgroup_subsys_state *
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cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
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{
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struct cgroup_cls_state *cs;
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cs = kzalloc(sizeof(*cs), GFP_KERNEL);
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if (!cs)
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return ERR_PTR(-ENOMEM);
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return &cs->css;
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}
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static int cgrp_css_online(struct cgroup_subsys_state *css)
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{
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struct cgroup_cls_state *cs = css_cls_state(css);
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struct cgroup_cls_state *parent = css_cls_state(css_parent(css));
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if (parent)
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cs->classid = parent->classid;
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return 0;
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}
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static void cgrp_css_free(struct cgroup_subsys_state *css)
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{
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kfree(css_cls_state(css));
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}
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static int update_classid(const void *v, struct file *file, unsigned n)
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{
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int err;
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struct socket *sock = sock_from_file(file, &err);
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if (sock)
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sock->sk->sk_classid = (u32)(unsigned long)v;
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return 0;
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}
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static void cgrp_attach(struct cgroup_subsys_state *css,
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struct cgroup_taskset *tset)
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{
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struct task_struct *p;
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struct cgroup_cls_state *cs = css_cls_state(css);
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void *v = (void *)(unsigned long)cs->classid;
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cgroup_taskset_for_each(p, css, tset) {
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task_lock(p);
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iterate_fd(p->files, 0, update_classid, v);
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task_unlock(p);
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}
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}
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static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft)
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{
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return css_cls_state(css)->classid;
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}
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static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft,
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u64 value)
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{
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css_cls_state(css)->classid = (u32) value;
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return 0;
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}
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static struct cftype ss_files[] = {
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{
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.name = "classid",
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.read_u64 = read_classid,
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.write_u64 = write_classid,
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},
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{ } /* terminate */
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};
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struct cgroup_subsys net_cls_subsys = {
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.name = "net_cls",
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.css_alloc = cgrp_css_alloc,
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.css_online = cgrp_css_online,
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.css_free = cgrp_css_free,
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.attach = cgrp_attach,
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.subsys_id = net_cls_subsys_id,
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.base_cftypes = ss_files,
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.module = THIS_MODULE,
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};
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struct cls_cgroup_head {
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u32 handle;
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struct tcf_exts exts;
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struct tcf_ematch_tree ematches;
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};
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static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct cls_cgroup_head *head = tp->root;
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u32 classid;
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rcu_read_lock();
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classid = task_cls_state(current)->classid;
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rcu_read_unlock();
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/*
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* Due to the nature of the classifier it is required to ignore all
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* packets originating from softirq context as accessing `current'
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* would lead to false results.
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*
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* This test assumes that all callers of dev_queue_xmit() explicitely
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* disable bh. Knowing this, it is possible to detect softirq based
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* calls by looking at the number of nested bh disable calls because
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* softirqs always disables bh.
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*/
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if (in_serving_softirq()) {
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/* If there is an sk_classid we'll use that. */
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if (!skb->sk)
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return -1;
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classid = skb->sk->sk_classid;
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}
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if (!classid)
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return -1;
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if (!tcf_em_tree_match(skb, &head->ematches, NULL))
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return -1;
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res->classid = classid;
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res->class = 0;
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return tcf_exts_exec(skb, &head->exts, res);
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}
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static unsigned long cls_cgroup_get(struct tcf_proto *tp, u32 handle)
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{
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return 0UL;
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}
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static void cls_cgroup_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static int cls_cgroup_init(struct tcf_proto *tp)
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{
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return 0;
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}
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static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = {
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[TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED },
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};
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static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base,
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u32 handle, struct nlattr **tca,
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unsigned long *arg)
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{
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struct nlattr *tb[TCA_CGROUP_MAX + 1];
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struct cls_cgroup_head *head = tp->root;
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struct tcf_ematch_tree t;
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struct tcf_exts e;
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int err;
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if (!tca[TCA_OPTIONS])
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return -EINVAL;
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if (head == NULL) {
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if (!handle)
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return -EINVAL;
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head = kzalloc(sizeof(*head), GFP_KERNEL);
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if (head == NULL)
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return -ENOBUFS;
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tcf_exts_init(&head->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
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head->handle = handle;
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tcf_tree_lock(tp);
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tp->root = head;
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tcf_tree_unlock(tp);
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}
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if (handle != head->handle)
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return -ENOENT;
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err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS],
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cgroup_policy);
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if (err < 0)
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return err;
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tcf_exts_init(&e, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
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err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e);
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if (err < 0)
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return err;
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err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t);
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if (err < 0)
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return err;
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tcf_exts_change(tp, &head->exts, &e);
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tcf_em_tree_change(tp, &head->ematches, &t);
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return 0;
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}
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static void cls_cgroup_destroy(struct tcf_proto *tp)
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{
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struct cls_cgroup_head *head = tp->root;
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if (head) {
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tcf_exts_destroy(tp, &head->exts);
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tcf_em_tree_destroy(tp, &head->ematches);
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kfree(head);
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}
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}
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static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg)
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{
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return -EOPNOTSUPP;
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}
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static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct cls_cgroup_head *head = tp->root;
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if (arg->count < arg->skip)
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goto skip;
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if (arg->fn(tp, (unsigned long) head, arg) < 0) {
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arg->stop = 1;
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return;
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}
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skip:
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arg->count++;
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}
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static int cls_cgroup_dump(struct tcf_proto *tp, unsigned long fh,
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struct sk_buff *skb, struct tcmsg *t)
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{
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struct cls_cgroup_head *head = tp->root;
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unsigned char *b = skb_tail_pointer(skb);
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struct nlattr *nest;
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t->tcm_handle = head->handle;
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nest = nla_nest_start(skb, TCA_OPTIONS);
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if (nest == NULL)
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goto nla_put_failure;
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if (tcf_exts_dump(skb, &head->exts) < 0 ||
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tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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if (tcf_exts_dump_stats(skb, &head->exts) < 0)
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static struct tcf_proto_ops cls_cgroup_ops __read_mostly = {
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.kind = "cgroup",
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.init = cls_cgroup_init,
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.change = cls_cgroup_change,
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.classify = cls_cgroup_classify,
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.destroy = cls_cgroup_destroy,
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.get = cls_cgroup_get,
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.put = cls_cgroup_put,
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.delete = cls_cgroup_delete,
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.walk = cls_cgroup_walk,
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.dump = cls_cgroup_dump,
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.owner = THIS_MODULE,
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};
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static int __init init_cgroup_cls(void)
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{
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int ret;
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ret = cgroup_load_subsys(&net_cls_subsys);
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if (ret)
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goto out;
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ret = register_tcf_proto_ops(&cls_cgroup_ops);
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if (ret)
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cgroup_unload_subsys(&net_cls_subsys);
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out:
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return ret;
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}
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static void __exit exit_cgroup_cls(void)
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{
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unregister_tcf_proto_ops(&cls_cgroup_ops);
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cgroup_unload_subsys(&net_cls_subsys);
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}
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module_init(init_cgroup_cls);
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module_exit(exit_cgroup_cls);
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MODULE_LICENSE("GPL");
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