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![Cong Wang](/assets/img/avatar_default.png)
This reverts commit ceffcc5e25
.
If we hold that refcnt, the netns can never be destroyed until
all actions are destroyed by user, this breaks our netns design
which we expect all actions are destroyed when we destroy the
whole netns.
Cc: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*
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* net/sched/act_gact.c Generic actions
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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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* copyright Jamal Hadi Salim (2002-4)
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.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/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_gact.h>
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#include <net/tc_act/tc_gact.h>
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static unsigned int gact_net_id;
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static struct tc_action_ops act_gact_ops;
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#ifdef CONFIG_GACT_PROB
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static int gact_net_rand(struct tcf_gact *gact)
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{
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (prandom_u32() % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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static int gact_determ(struct tcf_gact *gact)
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{
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u32 pack = atomic_inc_return(&gact->packets);
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (pack % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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typedef int (*g_rand)(struct tcf_gact *gact);
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static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
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#endif /* CONFIG_GACT_PROB */
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static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
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[TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
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[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
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};
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static int tcf_gact_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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struct nlattr *tb[TCA_GACT_MAX + 1];
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struct tc_gact *parm;
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struct tcf_gact *gact;
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int ret = 0;
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int err;
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#ifdef CONFIG_GACT_PROB
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struct tc_gact_p *p_parm = NULL;
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#endif
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_GACT_PARMS] == NULL)
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return -EINVAL;
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parm = nla_data(tb[TCA_GACT_PARMS]);
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#ifndef CONFIG_GACT_PROB
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if (tb[TCA_GACT_PROB] != NULL)
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return -EOPNOTSUPP;
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#else
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if (tb[TCA_GACT_PROB]) {
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p_parm = nla_data(tb[TCA_GACT_PROB]);
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if (p_parm->ptype >= MAX_RAND)
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return -EINVAL;
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}
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#endif
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if (!tcf_idr_check(tn, parm->index, a, bind)) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_gact_ops, bind, true);
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if (ret)
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return ret;
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ret = ACT_P_CREATED;
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} else {
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if (bind)/* dont override defaults */
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return 0;
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tcf_idr_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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}
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gact = to_gact(*a);
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ASSERT_RTNL();
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gact->tcf_action = parm->action;
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#ifdef CONFIG_GACT_PROB
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if (p_parm) {
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gact->tcfg_paction = p_parm->paction;
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gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
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/* Make sure tcfg_pval is written before tcfg_ptype
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* coupled with smp_rmb() in gact_net_rand() & gact_determ()
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*/
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smp_wmb();
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gact->tcfg_ptype = p_parm->ptype;
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}
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#endif
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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}
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static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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#ifdef CONFIG_GACT_PROB
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{
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u32 ptype = READ_ONCE(gact->tcfg_ptype);
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if (ptype)
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action = gact_rand[ptype](gact);
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}
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#endif
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bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
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if (action == TC_ACT_SHOT)
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qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
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tcf_lastuse_update(&gact->tcf_tm);
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return action;
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}
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static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
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u64 lastuse)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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struct tcf_t *tm = &gact->tcf_tm;
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
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packets);
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if (action == TC_ACT_SHOT)
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this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
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tm->lastuse = lastuse;
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}
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_gact *gact = to_gact(a);
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struct tc_gact opt = {
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.index = gact->tcf_index,
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.refcnt = gact->tcf_refcnt - ref,
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.bindcnt = gact->tcf_bindcnt - bind,
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.action = gact->tcf_action,
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};
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struct tcf_t t;
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if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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#ifdef CONFIG_GACT_PROB
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if (gact->tcfg_ptype) {
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struct tc_gact_p p_opt = {
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.paction = gact->tcfg_paction,
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.pval = gact->tcfg_pval,
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.ptype = gact->tcfg_ptype,
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};
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if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
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goto nla_put_failure;
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}
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#endif
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tcf_tm_dump(&t, &gact->tcf_tm);
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if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
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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 int tcf_gact_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static struct tc_action_ops act_gact_ops = {
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.kind = "gact",
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.type = TCA_ACT_GACT,
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.owner = THIS_MODULE,
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.act = tcf_gact,
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.stats_update = tcf_gact_stats_update,
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.dump = tcf_gact_dump,
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.init = tcf_gact_init,
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.walk = tcf_gact_walker,
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.lookup = tcf_gact_search,
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.size = sizeof(struct tcf_gact),
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};
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static __net_init int gact_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tc_action_net_init(tn, &act_gact_ops);
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}
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static void __net_exit gact_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations gact_net_ops = {
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.init = gact_init_net,
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.exit = gact_exit_net,
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.id = &gact_net_id,
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.size = sizeof(struct tc_action_net),
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
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MODULE_DESCRIPTION("Generic Classifier actions");
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MODULE_LICENSE("GPL");
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static int __init gact_init_module(void)
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{
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#ifdef CONFIG_GACT_PROB
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pr_info("GACT probability on\n");
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#else
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pr_info("GACT probability NOT on\n");
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#endif
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return tcf_register_action(&act_gact_ops, &gact_net_ops);
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}
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static void __exit gact_cleanup_module(void)
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{
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tcf_unregister_action(&act_gact_ops, &gact_net_ops);
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}
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module_init(gact_init_module);
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module_exit(gact_cleanup_module);
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