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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/gact.c Generic actions
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * copyright Jamal Hadi Salim (2002-4)
10 *
11 */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/types.h>
14#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
19#include <linux/module.h>
20#include <linux/init.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070021#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/pkt_sched.h>
23#include <linux/tc_act/tc_gact.h>
24#include <net/tc_act/tc_gact.h>
25
David S. Millere9ce1cd2006-08-21 23:54:55 -070026#define GACT_TAB_MASK 15
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -070029static int gact_net_rand(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -050031 if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval)
David S. Millere9ce1cd2006-08-21 23:54:55 -070032 return gact->tcf_action;
33 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034}
35
David S. Millere9ce1cd2006-08-21 23:54:55 -070036static int gact_determ(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
Kim Nordlunda1631482006-12-01 20:21:44 -080038 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
David S. Millere9ce1cd2006-08-21 23:54:55 -070039 return gact->tcf_action;
40 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041}
42
David S. Millere9ce1cd2006-08-21 23:54:55 -070043typedef int (*g_rand)(struct tcf_gact *gact);
Eric Dumazetcc7ec452011-01-19 19:26:56 +000044static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
David S. Millere9ce1cd2006-08-21 23:54:55 -070045#endif /* CONFIG_GACT_PROB */
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Patrick McHardy53b2bf32008-01-23 20:36:30 -080047static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
48 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
49 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
50};
51
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000052static int tcf_gact_init(struct net *net, struct nlattr *nla,
53 struct nlattr *est, struct tc_action *a,
54 int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080056 struct nlattr *tb[TCA_GACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 struct tc_gact *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -070058 struct tcf_gact *gact;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 int ret = 0;
Patrick McHardycee63722008-01-23 20:33:32 -080060 int err;
Hiroaki SHIMODA696ecdc2012-08-03 19:57:52 +090061#ifdef CONFIG_GACT_PROB
62 struct tc_gact_p *p_parm = NULL;
63#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Patrick McHardycee63722008-01-23 20:33:32 -080065 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return -EINVAL;
67
Patrick McHardy53b2bf32008-01-23 20:36:30 -080068 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080069 if (err < 0)
70 return err;
71
Patrick McHardy53b2bf32008-01-23 20:36:30 -080072 if (tb[TCA_GACT_PARMS] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -080074 parm = nla_data(tb[TCA_GACT_PARMS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Patrick McHardy53b2bf32008-01-23 20:36:30 -080076#ifndef CONFIG_GACT_PROB
Patrick McHardy7ba699c2008-01-22 22:11:50 -080077 if (tb[TCA_GACT_PROB] != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 return -EOPNOTSUPP;
Hiroaki SHIMODA696ecdc2012-08-03 19:57:52 +090079#else
80 if (tb[TCA_GACT_PROB]) {
81 p_parm = nla_data(tb[TCA_GACT_PROB]);
82 if (p_parm->ptype >= MAX_RAND)
83 return -EINVAL;
84 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#endif
86
WANG Cong86062032014-02-11 17:07:31 -080087 if (!tcf_hash_check(parm->index, a, bind)) {
88 ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind);
89 if (ret)
90 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 ret = ACT_P_CREATED;
92 } else {
Jamal Hadi Salim1a293212013-12-23 08:02:11 -050093 if (bind)/* dont override defaults */
94 return 0;
WANG Cong86062032014-02-11 17:07:31 -080095 tcf_hash_release(a, bind);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -050096 if (!ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return -EEXIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99
WANG Cong86062032014-02-11 17:07:31 -0800100 gact = to_gact(a);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101
102 spin_lock_bh(&gact->tcf_lock);
103 gact->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#ifdef CONFIG_GACT_PROB
Hiroaki SHIMODA696ecdc2012-08-03 19:57:52 +0900105 if (p_parm) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700106 gact->tcfg_paction = p_parm->paction;
107 gact->tcfg_pval = p_parm->pval;
108 gact->tcfg_ptype = p_parm->ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700111 spin_unlock_bh(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (ret == ACT_P_CREATED)
WANG Cong86062032014-02-11 17:07:31 -0800113 tcf_hash_insert(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return ret;
115}
116
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000117static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
118 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700120 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 int action = TC_ACT_SHOT;
122
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123 spin_lock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#ifdef CONFIG_GACT_PROB
Hiroaki SHIMODA696ecdc2012-08-03 19:57:52 +0900125 if (gact->tcfg_ptype)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 action = gact_rand[gact->tcfg_ptype](gact);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700128 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700130 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#endif
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700132 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700133 gact->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (action == TC_ACT_SHOT)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700135 gact->tcf_qstats.drops++;
136 gact->tcf_tm.lastuse = jiffies;
137 spin_unlock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 return action;
140}
141
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700144 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 struct tcf_gact *gact = a->priv;
Eric Dumazet1c40be12010-08-16 20:04:22 +0000146 struct tc_gact opt = {
147 .index = gact->tcf_index,
148 .refcnt = gact->tcf_refcnt - ref,
149 .bindcnt = gact->tcf_bindcnt - bind,
150 .action = gact->tcf_action,
151 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct tcf_t t;
153
David S. Miller1b34ec42012-03-29 05:11:39 -0400154 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
155 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -0700157 if (gact->tcfg_ptype) {
Eric Dumazet1c40be12010-08-16 20:04:22 +0000158 struct tc_gact_p p_opt = {
159 .paction = gact->tcfg_paction,
160 .pval = gact->tcfg_pval,
161 .ptype = gact->tcfg_ptype,
162 };
163
David S. Miller1b34ec42012-03-29 05:11:39 -0400164 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
165 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
167#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700168 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
169 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
170 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
David S. Miller1b34ec42012-03-29 05:11:39 -0400171 if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
172 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return skb->len;
174
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800175nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700176 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 return -1;
178}
179
180static struct tc_action_ops act_gact_ops = {
181 .kind = "gact",
182 .type = TCA_ACT_GACT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 .owner = THIS_MODULE,
184 .act = tcf_gact,
185 .dump = tcf_gact_dump,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .init = tcf_gact_init,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187};
188
189MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
190MODULE_DESCRIPTION("Generic Classifier actions");
191MODULE_LICENSE("GPL");
192
David S. Millere9ce1cd2006-08-21 23:54:55 -0700193static int __init gact_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
195#ifdef CONFIG_GACT_PROB
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000196 pr_info("GACT probability on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197#else
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000198 pr_info("GACT probability NOT on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#endif
WANG Cong4f1e9d82014-02-11 17:07:33 -0800200 return tcf_register_action(&act_gact_ops, GACT_TAB_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
David S. Millere9ce1cd2006-08-21 23:54:55 -0700203static void __exit gact_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 tcf_unregister_action(&act_gact_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208module_init(gact_init_module);
209module_exit(gact_cleanup_module);