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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
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/*
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* net/sched/cls_cgroup.c Control Group Classifier
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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/skbuff.h>
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#include <linux/rcupdate.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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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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struct tcf_proto *tp;
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struct rcu_work rwork;
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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 = rcu_dereference_bh(tp->root);
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u32 classid = task_get_classid(skb);
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if (unlikely(!head))
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return -1;
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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 void *cls_cgroup_get(struct tcf_proto *tp, u32 handle)
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{
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return NULL;
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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 void __cls_cgroup_destroy(struct cls_cgroup_head *head)
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{
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tcf_exts_destroy(&head->exts);
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tcf_em_tree_destroy(&head->ematches);
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tcf_exts_put_net(&head->exts);
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kfree(head);
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}
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static void cls_cgroup_destroy_work(struct work_struct *work)
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{
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struct cls_cgroup_head *head = container_of(to_rcu_work(work),
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struct cls_cgroup_head,
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rwork);
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rtnl_lock();
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__cls_cgroup_destroy(head);
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rtnl_unlock();
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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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void **arg, u32 flags,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tb[TCA_CGROUP_MAX + 1];
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struct cls_cgroup_head *head = rtnl_dereference(tp->root);
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struct cls_cgroup_head *new;
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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 && !handle)
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return -EINVAL;
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if (head && handle != head->handle)
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return -ENOENT;
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new = kzalloc(sizeof(*head), GFP_KERNEL);
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if (!new)
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return -ENOBUFS;
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err = tcf_exts_init(&new->exts, net, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
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if (err < 0)
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goto errout;
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new->handle = handle;
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new->tp = tp;
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err = nla_parse_nested_deprecated(tb, TCA_CGROUP_MAX,
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tca[TCA_OPTIONS], cgroup_policy,
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NULL);
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if (err < 0)
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goto errout;
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err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, flags,
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extack);
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if (err < 0)
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goto errout;
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err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches);
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if (err < 0)
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goto errout;
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rcu_assign_pointer(tp->root, new);
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if (head) {
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tcf_exts_get_net(&head->exts);
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tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
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}
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return 0;
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errout:
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tcf_exts_destroy(&new->exts);
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kfree(new);
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return err;
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}
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static void cls_cgroup_destroy(struct tcf_proto *tp, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct cls_cgroup_head *head = rtnl_dereference(tp->root);
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/* Head can still be NULL due to cls_cgroup_init(). */
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if (head) {
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if (tcf_exts_get_net(&head->exts))
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tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
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else
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__cls_cgroup_destroy(head);
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}
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}
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static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last,
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bool rtnl_held, struct netlink_ext_ack *extack)
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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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bool rtnl_held)
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{
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struct cls_cgroup_head *head = rtnl_dereference(tp->root);
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if (arg->count < arg->skip)
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goto skip;
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if (!head)
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return;
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if (arg->fn(tp, 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 net *net, struct tcf_proto *tp, void *fh,
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struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
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{
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struct cls_cgroup_head *head = rtnl_dereference(tp->root);
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struct nlattr *nest;
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t->tcm_handle = head->handle;
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nest = nla_nest_start_noflag(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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nla_nest_cancel(skb, nest);
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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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.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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return register_tcf_proto_ops(&cls_cgroup_ops);
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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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}
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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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