2005-04-17 06:20:36 +08:00
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/*
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* net/sched/police.c Input police filter.
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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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* J Hadi Salim (action changes)
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*/
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#include <linux/module.h>
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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/init.h>
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#include <net/act_api.h>
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2007-03-26 14:06:12 +08:00
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#include <net/netlink.h>
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2005-04-17 06:20:36 +08:00
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2007-09-12 22:35:24 +08:00
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#define L2T(p,L) qdisc_l2t((p)->tcfp_R_tab, L)
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#define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L)
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2005-04-17 06:20:36 +08:00
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2006-08-22 14:54:55 +08:00
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#define POL_TAB_MASK 15
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static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
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static u32 police_idx_gen;
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static DEFINE_RWLOCK(police_lock);
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2005-04-17 06:20:36 +08:00
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2006-08-22 14:54:55 +08:00
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static struct tcf_hashinfo police_hash_info = {
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.htab = tcf_police_ht,
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.hmask = POL_TAB_MASK,
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.lock = &police_lock,
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};
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2005-04-17 06:20:36 +08:00
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2006-12-01 11:54:05 +08:00
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/* old policer structure from before tc actions */
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struct tc_police_compat
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{
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u32 index;
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int action;
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u32 limit;
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u32 burst;
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u32 mtu;
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struct tc_ratespec rate;
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struct tc_ratespec peakrate;
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};
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2006-08-22 14:54:55 +08:00
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/* Each policer is serialized by its individual spinlock */
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2005-04-17 06:20:36 +08:00
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2006-04-07 13:24:22 +08:00
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static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
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2007-02-09 22:25:16 +08:00
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int type, struct tc_action *a)
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2005-04-17 06:20:36 +08:00
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{
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2006-08-22 14:54:55 +08:00
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struct tcf_common *p;
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2005-04-17 06:20:36 +08:00
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int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
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2008-01-24 12:34:11 +08:00
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struct nlattr *nest;
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2005-04-17 06:20:36 +08:00
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[NET_SCHED] protect action config/dump from irqs
(with no apologies to C Heston)
On Mon, 2007-10-09 at 21:00 +0800, Herbert Xu wrote:
On Sun, Sep 02, 2007 at 01:11:29PM +0000, Christian Kujau wrote:
> >
> > after upgrading to 2.6.23-rc5 (and applying davem's fix [0]), lockdep
> > was quite noisy when I tried to shape my external (wireless) interface:
> >
> > [ 6400.534545] FahCore_78.exe/3552 just changed the state of lock:
> > [ 6400.534713] (&dev->ingress_lock){-+..}, at: [<c038d595>]
> > netif_receive_skb+0x2d5/0x3c0
> > [ 6400.534941] but this lock took another, soft-read-irq-unsafe lock in the
> > past:
> > [ 6400.535145] (police_lock){-.--}
>
> This is a genuine dead-lock. The police lock can be taken
> for reading with softirqs on. If a second CPU tries to take
> the police lock for writing, while holding the ingress lock,
> then a softirq on the first CPU can dead-lock when it tries
> to get the ingress lock.
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-12 22:32:59 +08:00
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read_lock_bh(&police_lock);
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2005-04-17 06:20:36 +08:00
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s_i = cb->args[0];
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2006-08-22 14:54:55 +08:00
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for (i = 0; i < (POL_TAB_MASK + 1); i++) {
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p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
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2005-04-17 06:20:36 +08:00
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2006-08-22 14:54:55 +08:00
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for (; p; p = p->tcfc_next) {
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2005-04-17 06:20:36 +08:00
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index++;
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if (index < s_i)
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continue;
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a->priv = p;
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a->order = index;
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2008-01-24 12:34:11 +08:00
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nest = nla_nest_start(skb, a->order);
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if (nest == NULL)
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goto nla_put_failure;
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2005-04-17 06:20:36 +08:00
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if (type == RTM_DELACTION)
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err = tcf_action_dump_1(skb, a, 0, 1);
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else
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err = tcf_action_dump_1(skb, a, 0, 0);
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if (err < 0) {
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index--;
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2008-01-24 12:34:11 +08:00
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nla_nest_cancel(skb, nest);
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2005-04-17 06:20:36 +08:00
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goto done;
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}
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2008-01-24 12:34:11 +08:00
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nla_nest_end(skb, nest);
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2005-04-17 06:20:36 +08:00
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n_i++;
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}
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}
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done:
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[NET_SCHED] protect action config/dump from irqs
(with no apologies to C Heston)
On Mon, 2007-10-09 at 21:00 +0800, Herbert Xu wrote:
On Sun, Sep 02, 2007 at 01:11:29PM +0000, Christian Kujau wrote:
> >
> > after upgrading to 2.6.23-rc5 (and applying davem's fix [0]), lockdep
> > was quite noisy when I tried to shape my external (wireless) interface:
> >
> > [ 6400.534545] FahCore_78.exe/3552 just changed the state of lock:
> > [ 6400.534713] (&dev->ingress_lock){-+..}, at: [<c038d595>]
> > netif_receive_skb+0x2d5/0x3c0
> > [ 6400.534941] but this lock took another, soft-read-irq-unsafe lock in the
> > past:
> > [ 6400.535145] (police_lock){-.--}
>
> This is a genuine dead-lock. The police lock can be taken
> for reading with softirqs on. If a second CPU tries to take
> the police lock for writing, while holding the ingress lock,
> then a softirq on the first CPU can dead-lock when it tries
> to get the ingress lock.
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-12 22:32:59 +08:00
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read_unlock_bh(&police_lock);
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2005-04-17 06:20:36 +08:00
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if (n_i)
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cb->args[0] += n_i;
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return n_i;
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2008-01-23 14:11:50 +08:00
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nla_put_failure:
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2008-01-24 12:34:11 +08:00
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nla_nest_cancel(skb, nest);
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2005-04-17 06:20:36 +08:00
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goto done;
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}
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2007-07-15 15:03:05 +08:00
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static void tcf_police_destroy(struct tcf_police *p)
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2005-04-17 06:20:36 +08:00
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{
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2006-08-22 14:54:55 +08:00
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unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
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struct tcf_common **p1p;
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2007-02-09 22:25:16 +08:00
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2006-08-22 14:54:55 +08:00
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for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
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if (*p1p == &p->common) {
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2005-04-17 06:20:36 +08:00
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write_lock_bh(&police_lock);
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2006-08-22 14:54:55 +08:00
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*p1p = p->tcf_next;
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2005-04-17 06:20:36 +08:00
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write_unlock_bh(&police_lock);
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2006-08-22 14:54:55 +08:00
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gen_kill_estimator(&p->tcf_bstats,
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&p->tcf_rate_est);
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if (p->tcfp_R_tab)
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qdisc_put_rtab(p->tcfp_R_tab);
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if (p->tcfp_P_tab)
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qdisc_put_rtab(p->tcfp_P_tab);
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2005-04-17 06:20:36 +08:00
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kfree(p);
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return;
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}
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}
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BUG_TRAP(0);
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}
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2008-01-23 14:11:50 +08:00
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static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est,
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2007-02-09 22:25:16 +08:00
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struct tc_action *a, int ovr, int bind)
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2005-04-17 06:20:36 +08:00
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{
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unsigned h;
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int ret = 0, err;
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2008-01-23 14:11:50 +08:00
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struct nlattr *tb[TCA_POLICE_MAX + 1];
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2005-04-17 06:20:36 +08:00
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struct tc_police *parm;
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2006-08-22 14:54:55 +08:00
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struct tcf_police *police;
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2005-04-17 06:20:36 +08:00
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struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
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2006-12-01 11:54:05 +08:00
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int size;
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2005-04-17 06:20:36 +08:00
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2008-01-24 12:33:32 +08:00
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if (nla == NULL)
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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2008-01-24 12:33:32 +08:00
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err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, NULL);
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if (err < 0)
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return err;
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2008-01-23 14:11:50 +08:00
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if (tb[TCA_POLICE_TBF] == NULL)
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2006-12-01 11:54:05 +08:00
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return -EINVAL;
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2008-01-23 14:11:50 +08:00
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size = nla_len(tb[TCA_POLICE_TBF]);
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2006-12-01 11:54:05 +08:00
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if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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2008-01-23 14:11:50 +08:00
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parm = nla_data(tb[TCA_POLICE_TBF]);
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2005-04-17 06:20:36 +08:00
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2008-01-23 14:11:50 +08:00
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if (tb[TCA_POLICE_RESULT] != NULL &&
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nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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2008-01-23 14:11:50 +08:00
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if (tb[TCA_POLICE_RESULT] != NULL &&
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nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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2006-08-22 14:54:55 +08:00
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if (parm->index) {
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struct tcf_common *pc;
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pc = tcf_hash_lookup(parm->index, &police_hash_info);
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if (pc != NULL) {
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a->priv = pc;
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police = to_police(pc);
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if (bind) {
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police->tcf_bindcnt += 1;
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police->tcf_refcnt += 1;
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}
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if (ovr)
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goto override;
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return ret;
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2005-04-17 06:20:36 +08:00
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}
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}
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2006-08-22 14:54:55 +08:00
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police = kzalloc(sizeof(*police), GFP_KERNEL);
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if (police == NULL)
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2005-04-17 06:20:36 +08:00
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return -ENOMEM;
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ret = ACT_P_CREATED;
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2006-08-22 14:54:55 +08:00
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police->tcf_refcnt = 1;
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spin_lock_init(&police->tcf_lock);
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2005-04-17 06:20:36 +08:00
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if (bind)
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2006-08-22 14:54:55 +08:00
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police->tcf_bindcnt = 1;
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2005-04-17 06:20:36 +08:00
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override:
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if (parm->rate.rate) {
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err = -ENOMEM;
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2008-01-23 14:11:50 +08:00
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R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
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2005-04-17 06:20:36 +08:00
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if (R_tab == NULL)
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goto failure;
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if (parm->peakrate.rate) {
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P_tab = qdisc_get_rtab(&parm->peakrate,
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2008-01-23 14:11:50 +08:00
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tb[TCA_POLICE_PEAKRATE]);
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2006-08-22 14:54:55 +08:00
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if (P_tab == NULL) {
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2005-04-17 06:20:36 +08:00
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qdisc_put_rtab(R_tab);
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goto failure;
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}
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}
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}
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/* No failure allowed after this point */
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2006-08-22 14:54:55 +08:00
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spin_lock_bh(&police->tcf_lock);
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2005-04-17 06:20:36 +08:00
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if (R_tab != NULL) {
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2006-08-22 14:54:55 +08:00
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qdisc_put_rtab(police->tcfp_R_tab);
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police->tcfp_R_tab = R_tab;
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2005-04-17 06:20:36 +08:00
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}
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if (P_tab != NULL) {
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2006-08-22 14:54:55 +08:00
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qdisc_put_rtab(police->tcfp_P_tab);
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police->tcfp_P_tab = P_tab;
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2005-04-17 06:20:36 +08:00
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}
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2008-01-23 14:11:50 +08:00
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if (tb[TCA_POLICE_RESULT])
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2008-01-24 12:35:03 +08:00
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police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
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2006-08-22 14:54:55 +08:00
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police->tcfp_toks = police->tcfp_burst = parm->burst;
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police->tcfp_mtu = parm->mtu;
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if (police->tcfp_mtu == 0) {
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police->tcfp_mtu = ~0;
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if (police->tcfp_R_tab)
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police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
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2005-04-17 06:20:36 +08:00
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}
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2006-08-22 14:54:55 +08:00
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if (police->tcfp_P_tab)
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police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
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police->tcf_action = parm->action;
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2005-04-17 06:20:36 +08:00
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2008-01-23 14:11:50 +08:00
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if (tb[TCA_POLICE_AVRATE])
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2008-01-24 12:35:03 +08:00
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police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
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2005-04-17 06:20:36 +08:00
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if (est)
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2006-08-22 14:54:55 +08:00
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gen_replace_estimator(&police->tcf_bstats,
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&police->tcf_rate_est,
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2008-01-23 14:11:50 +08:00
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&police->tcf_lock, est);
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2005-04-17 06:20:36 +08:00
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2006-08-22 14:54:55 +08:00
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spin_unlock_bh(&police->tcf_lock);
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2005-04-17 06:20:36 +08:00
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if (ret != ACT_P_CREATED)
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return ret;
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|
2007-03-24 02:29:25 +08:00
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police->tcfp_t_c = psched_get_time();
|
2006-08-22 14:54:55 +08:00
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police->tcf_index = parm->index ? parm->index :
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tcf_hash_new_index(&police_idx_gen, &police_hash_info);
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h = tcf_hash(police->tcf_index, POL_TAB_MASK);
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2005-04-17 06:20:36 +08:00
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write_lock_bh(&police_lock);
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2006-08-22 14:54:55 +08:00
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police->tcf_next = tcf_police_ht[h];
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tcf_police_ht[h] = &police->common;
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2005-04-17 06:20:36 +08:00
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write_unlock_bh(&police_lock);
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2006-08-22 14:54:55 +08:00
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a->priv = police;
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2005-04-17 06:20:36 +08:00
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return ret;
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|
failure:
|
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|
|
if (ret == ACT_P_CREATED)
|
2006-08-22 14:54:55 +08:00
|
|
|
kfree(police);
|
2005-04-17 06:20:36 +08:00
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|
return err;
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}
|
|
|
|
|
|
|
|
static int tcf_act_police_cleanup(struct tc_action *a, int bind)
|
|
|
|
{
|
2006-08-22 14:54:55 +08:00
|
|
|
struct tcf_police *p = a->priv;
|
2007-07-15 15:03:05 +08:00
|
|
|
int ret = 0;
|
2005-04-17 06:20:36 +08:00
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|
|
2007-07-15 15:03:05 +08:00
|
|
|
if (p != NULL) {
|
|
|
|
if (bind)
|
|
|
|
p->tcf_bindcnt--;
|
|
|
|
|
|
|
|
p->tcf_refcnt--;
|
|
|
|
if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
|
|
|
|
tcf_police_destroy(p);
|
|
|
|
ret = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return ret;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2006-01-09 14:15:34 +08:00
|
|
|
static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
|
2007-02-09 22:25:16 +08:00
|
|
|
struct tcf_result *res)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-08-22 14:54:55 +08:00
|
|
|
struct tcf_police *police = a->priv;
|
2005-04-17 06:20:36 +08:00
|
|
|
psched_time_t now;
|
|
|
|
long toks;
|
|
|
|
long ptoks = 0;
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|
|
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|
2006-08-22 14:54:55 +08:00
|
|
|
spin_lock(&police->tcf_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-08-22 14:54:55 +08:00
|
|
|
police->tcf_bstats.bytes += skb->len;
|
|
|
|
police->tcf_bstats.packets++;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-08-22 14:54:55 +08:00
|
|
|
if (police->tcfp_ewma_rate &&
|
|
|
|
police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
|
|
|
|
police->tcf_qstats.overlimits++;
|
|
|
|
spin_unlock(&police->tcf_lock);
|
|
|
|
return police->tcf_action;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2006-08-22 14:54:55 +08:00
|
|
|
if (skb->len <= police->tcfp_mtu) {
|
|
|
|
if (police->tcfp_R_tab == NULL) {
|
|
|
|
spin_unlock(&police->tcf_lock);
|
|
|
|
return police->tcfp_result;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-03-24 02:29:25 +08:00
|
|
|
now = psched_get_time();
|
2007-03-24 02:29:11 +08:00
|
|
|
toks = psched_tdiff_bounded(now, police->tcfp_t_c,
|
|
|
|
police->tcfp_burst);
|
2006-08-22 14:54:55 +08:00
|
|
|
if (police->tcfp_P_tab) {
|
|
|
|
ptoks = toks + police->tcfp_ptoks;
|
|
|
|
if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
|
|
|
|
ptoks = (long)L2T_P(police, police->tcfp_mtu);
|
|
|
|
ptoks -= L2T_P(police, skb->len);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2006-08-22 14:54:55 +08:00
|
|
|
toks += police->tcfp_toks;
|
|
|
|
if (toks > (long)police->tcfp_burst)
|
|
|
|
toks = police->tcfp_burst;
|
|
|
|
toks -= L2T(police, skb->len);
|
2005-04-17 06:20:36 +08:00
|
|
|
if ((toks|ptoks) >= 0) {
|
2006-08-22 14:54:55 +08:00
|
|
|
police->tcfp_t_c = now;
|
|
|
|
police->tcfp_toks = toks;
|
|
|
|
police->tcfp_ptoks = ptoks;
|
|
|
|
spin_unlock(&police->tcf_lock);
|
|
|
|
return police->tcfp_result;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-08-22 14:54:55 +08:00
|
|
|
police->tcf_qstats.overlimits++;
|
|
|
|
spin_unlock(&police->tcf_lock);
|
|
|
|
return police->tcf_action;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
|
|
|
{
|
2007-04-20 11:29:13 +08:00
|
|
|
unsigned char *b = skb_tail_pointer(skb);
|
2006-08-22 14:54:55 +08:00
|
|
|
struct tcf_police *police = a->priv;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct tc_police opt;
|
2006-08-22 14:54:55 +08:00
|
|
|
|
|
|
|
opt.index = police->tcf_index;
|
|
|
|
opt.action = police->tcf_action;
|
|
|
|
opt.mtu = police->tcfp_mtu;
|
|
|
|
opt.burst = police->tcfp_burst;
|
|
|
|
opt.refcnt = police->tcf_refcnt - ref;
|
|
|
|
opt.bindcnt = police->tcf_bindcnt - bind;
|
|
|
|
if (police->tcfp_R_tab)
|
|
|
|
opt.rate = police->tcfp_R_tab->rate;
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
|
|
|
memset(&opt.rate, 0, sizeof(opt.rate));
|
2006-08-22 14:54:55 +08:00
|
|
|
if (police->tcfp_P_tab)
|
|
|
|
opt.peakrate = police->tcfp_P_tab->rate;
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
|
|
|
memset(&opt.peakrate, 0, sizeof(opt.peakrate));
|
2008-01-23 14:11:50 +08:00
|
|
|
NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
|
2006-08-22 14:54:55 +08:00
|
|
|
if (police->tcfp_result)
|
2008-01-24 12:34:48 +08:00
|
|
|
NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
|
2006-08-22 14:54:55 +08:00
|
|
|
if (police->tcfp_ewma_rate)
|
2008-01-24 12:34:48 +08:00
|
|
|
NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
|
2005-04-17 06:20:36 +08:00
|
|
|
return skb->len;
|
|
|
|
|
2008-01-23 14:11:50 +08:00
|
|
|
nla_put_failure:
|
2007-03-26 14:06:12 +08:00
|
|
|
nlmsg_trim(skb, b);
|
2005-04-17 06:20:36 +08:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Alexey Kuznetsov");
|
|
|
|
MODULE_DESCRIPTION("Policing actions");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
static struct tc_action_ops act_police_ops = {
|
|
|
|
.kind = "police",
|
2006-08-22 14:54:55 +08:00
|
|
|
.hinfo = &police_hash_info,
|
2005-04-17 06:20:36 +08:00
|
|
|
.type = TCA_ID_POLICE,
|
|
|
|
.capab = TCA_CAP_NONE,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.act = tcf_act_police,
|
|
|
|
.dump = tcf_act_police_dump,
|
|
|
|
.cleanup = tcf_act_police_cleanup,
|
2006-08-22 14:54:55 +08:00
|
|
|
.lookup = tcf_hash_search,
|
2005-04-17 06:20:36 +08:00
|
|
|
.init = tcf_act_police_locate,
|
2006-04-07 13:24:22 +08:00
|
|
|
.walk = tcf_act_police_walker
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
police_init_module(void)
|
|
|
|
{
|
|
|
|
return tcf_register_action(&act_police_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
police_cleanup_module(void)
|
|
|
|
{
|
|
|
|
tcf_unregister_action(&act_police_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(police_init_module);
|
|
|
|
module_exit(police_cleanup_module);
|