2005-04-16 16:20:36 -06:00
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/*
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* net/sched/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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2007-03-26 00:06:12 -06:00
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#include <net/netlink.h>
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2005-04-16 16:20:36 -06:00
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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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2006-08-22 00:54:55 -06:00
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#define GACT_TAB_MASK 15
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2006-08-22 00:54:55 -06:00
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static int gact_net_rand(struct tcf_gact *gact)
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2005-04-16 16:20:36 -06:00
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{
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2014-01-11 05:15:59 -07:00
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if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval)
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2006-08-22 00:54:55 -06:00
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return gact->tcf_action;
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return gact->tcfg_paction;
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2005-04-16 16:20:36 -06:00
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}
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2006-08-22 00:54:55 -06:00
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static int gact_determ(struct tcf_gact *gact)
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2005-04-16 16:20:36 -06:00
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{
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2006-12-01 21:21:44 -07:00
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if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
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2006-08-22 00:54:55 -06:00
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return gact->tcf_action;
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return gact->tcfg_paction;
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2005-04-16 16:20:36 -06:00
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}
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2006-08-22 00:54:55 -06:00
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typedef int (*g_rand)(struct tcf_gact *gact);
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2011-01-19 12:26:56 -07:00
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static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
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2006-08-22 00:54:55 -06:00
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#endif /* CONFIG_GACT_PROB */
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2005-04-16 16:20:36 -06:00
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2008-01-23 21:36:30 -07:00
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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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2013-01-13 22:15:39 -07:00
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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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2005-04-16 16:20:36 -06:00
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{
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2008-01-22 23:11:50 -07:00
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struct nlattr *tb[TCA_GACT_MAX + 1];
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2005-04-16 16:20:36 -06:00
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struct tc_gact *parm;
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2006-08-22 00:54:55 -06:00
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struct tcf_gact *gact;
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2005-04-16 16:20:36 -06:00
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int ret = 0;
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2008-01-23 21:33:32 -07:00
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int err;
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2012-08-03 04:57:52 -06:00
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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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2005-04-16 16:20:36 -06:00
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2008-01-23 21:33:32 -07:00
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if (nla == NULL)
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2008-01-23 21:36:30 -07:00
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err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
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2008-01-23 21:33:32 -07:00
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if (err < 0)
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return err;
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2008-01-23 21:36:30 -07:00
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if (tb[TCA_GACT_PARMS] == NULL)
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2008-01-22 23:11:50 -07:00
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parm = nla_data(tb[TCA_GACT_PARMS]);
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2005-04-16 16:20:36 -06:00
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2008-01-23 21:36:30 -07:00
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#ifndef CONFIG_GACT_PROB
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2008-01-22 23:11:50 -07:00
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if (tb[TCA_GACT_PROB] != NULL)
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2005-04-16 16:20:36 -06:00
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return -EOPNOTSUPP;
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2012-08-03 04:57:52 -06:00
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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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2005-04-16 16:20:36 -06:00
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#endif
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2014-02-11 18:07:31 -07:00
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if (!tcf_hash_check(parm->index, a, bind)) {
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ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind);
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if (ret)
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return ret;
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2005-04-16 16:20:36 -06:00
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ret = ACT_P_CREATED;
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} else {
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2013-12-23 06:02:11 -07:00
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if (bind)/* dont override defaults */
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return 0;
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2014-02-11 18:07:31 -07:00
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tcf_hash_release(a, bind);
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2013-12-23 06:02:11 -07:00
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if (!ovr)
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2005-04-16 16:20:36 -06:00
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return -EEXIST;
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}
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2014-02-11 18:07:31 -07:00
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gact = to_gact(a);
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2006-08-22 00:54:55 -06:00
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spin_lock_bh(&gact->tcf_lock);
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gact->tcf_action = parm->action;
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2012-08-03 04:57:52 -06:00
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if (p_parm) {
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2006-08-22 00:54:55 -06:00
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gact->tcfg_paction = p_parm->paction;
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gact->tcfg_pval = p_parm->pval;
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gact->tcfg_ptype = p_parm->ptype;
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2005-04-16 16:20:36 -06:00
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}
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#endif
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2006-08-22 00:54:55 -06:00
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spin_unlock_bh(&gact->tcf_lock);
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2005-04-16 16:20:36 -06:00
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if (ret == ACT_P_CREATED)
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2014-02-11 18:07:31 -07:00
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tcf_hash_insert(a);
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2005-04-16 16:20:36 -06:00
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return ret;
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}
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2011-07-05 17:25:42 -06:00
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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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2005-04-16 16:20:36 -06:00
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{
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2006-08-22 00:54:55 -06:00
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struct tcf_gact *gact = a->priv;
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2005-04-16 16:20:36 -06:00
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int action = TC_ACT_SHOT;
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2006-08-22 00:54:55 -06:00
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spin_lock(&gact->tcf_lock);
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2012-08-03 04:57:52 -06:00
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if (gact->tcfg_ptype)
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2006-08-22 00:54:55 -06:00
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action = gact_rand[gact->tcfg_ptype](gact);
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2005-04-16 16:20:36 -06:00
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else
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2006-08-22 00:54:55 -06:00
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action = gact->tcf_action;
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2005-04-16 16:20:36 -06:00
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#else
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2006-08-22 00:54:55 -06:00
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action = gact->tcf_action;
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2005-04-16 16:20:36 -06:00
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#endif
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2008-07-20 01:08:27 -06:00
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gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
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2006-08-22 00:54:55 -06:00
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gact->tcf_bstats.packets++;
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2005-04-16 16:20:36 -06:00
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if (action == TC_ACT_SHOT)
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2006-08-22 00:54:55 -06:00
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gact->tcf_qstats.drops++;
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gact->tcf_tm.lastuse = jiffies;
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spin_unlock(&gact->tcf_lock);
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2005-04-16 16:20:36 -06:00
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return action;
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}
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2006-08-22 00:54:55 -06:00
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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2005-04-16 16:20:36 -06:00
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{
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2007-04-19 21:29:13 -06:00
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unsigned char *b = skb_tail_pointer(skb);
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2006-08-22 00:54:55 -06:00
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struct tcf_gact *gact = a->priv;
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2010-08-16 14:04:22 -06:00
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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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2005-04-16 16:20:36 -06:00
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struct tcf_t t;
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2012-03-29 03:11:39 -06:00
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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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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2006-08-22 00:54:55 -06:00
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if (gact->tcfg_ptype) {
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2010-08-16 14:04:22 -06:00
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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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2012-03-29 03:11:39 -06:00
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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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2005-04-16 16:20:36 -06:00
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}
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#endif
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2006-08-22 00:54:55 -06:00
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t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
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t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
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2012-03-29 03:11:39 -06:00
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if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
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goto nla_put_failure;
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2005-04-16 16:20:36 -06:00
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return skb->len;
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2008-01-22 23:11:50 -07:00
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nla_put_failure:
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2007-03-26 00:06:12 -06:00
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nlmsg_trim(skb, b);
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2005-04-16 16:20:36 -06:00
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return -1;
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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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.dump = tcf_gact_dump,
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.init = tcf_gact_init,
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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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2006-08-22 00:54:55 -06:00
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static int __init gact_init_module(void)
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2005-04-16 16:20:36 -06:00
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{
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#ifdef CONFIG_GACT_PROB
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2011-01-19 12:26:56 -07:00
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pr_info("GACT probability on\n");
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2005-04-16 16:20:36 -06:00
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#else
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2011-01-19 12:26:56 -07:00
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pr_info("GACT probability NOT on\n");
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2005-04-16 16:20:36 -06:00
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#endif
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2014-02-11 18:07:33 -07:00
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return tcf_register_action(&act_gact_ops, GACT_TAB_MASK);
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2005-04-16 16:20:36 -06:00
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}
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2006-08-22 00:54:55 -06:00
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static void __exit gact_cleanup_module(void)
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2005-04-16 16:20:36 -06:00
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{
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tcf_unregister_action(&act_gact_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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