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Jamal Hadi Salimdb753072005-04-24 20:10:16 -07001/*
Jiri Pirko0c6965d2014-11-05 20:51:51 +01002 * net/sched/act_simple.c Simple example of an action
Jamal Hadi Salimdb753072005-04-24 20:10:16 -07003 *
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 *
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -07009 * Authors: Jamal Hadi Salim (2005-8)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070010 *
11 */
12
David S. Millercbdbf002005-04-25 12:15:01 -070013#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
David S. Millercbdbf002005-04-25 12:15:01 -070015#include <linux/init.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070016#include <linux/kernel.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070017#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070019#include <net/netlink.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070020#include <net/pkt_sched.h>
21
22#define TCA_ACT_SIMP 22
23
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070024#include <linux/tc_act/tc_defact.h>
25#include <net/tc_act/tc_defact.h>
26
David S. Millere9ce1cd2006-08-21 23:54:55 -070027#define SIMP_TAB_MASK 7
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070028
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070029#define SIMP_MAX_DATA 32
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000030static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
31 struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070032{
David S. Millere9ce1cd2006-08-21 23:54:55 -070033 struct tcf_defact *d = a->priv;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070034
David S. Millere9ce1cd2006-08-21 23:54:55 -070035 spin_lock(&d->tcf_lock);
36 d->tcf_tm.lastuse = jiffies;
Eric Dumazetbfe0d022011-01-09 08:30:54 +000037 bstats_update(&d->tcf_bstats, skb);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070038
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090039 /* print policy string followed by _ then packet count
40 * Example if this was the 3rd packet and the string was "hello"
41 * then it would look like "hello_3" (without quotes)
Eric Dumazetcc7ec452011-01-19 19:26:56 +000042 */
stephen hemminger6ff9c362010-05-12 06:37:05 +000043 pr_info("simple: %s_%d\n",
David S. Millere9ce1cd2006-08-21 23:54:55 -070044 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
45 spin_unlock(&d->tcf_lock);
46 return d->tcf_action;
47}
48
WANG Conga5b5c952014-02-11 17:07:32 -080049static void tcf_simp_release(struct tc_action *a, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070050{
WANG Cong86062032014-02-11 17:07:31 -080051 struct tcf_defact *d = to_defact(a);
WANG Conga5b5c952014-02-11 17:07:32 -080052 kfree(d->tcfd_defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -070053}
54
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070055static int alloc_defdata(struct tcf_defact *d, char *defdata)
David S. Millere9ce1cd2006-08-21 23:54:55 -070056{
Dan Carpenter0eff6832010-07-14 17:56:37 -070057 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -070058 if (unlikely(!d->tcfd_defdata))
59 return -ENOMEM;
Dan Carpenter0eff6832010-07-14 17:56:37 -070060 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
David S. Millere9ce1cd2006-08-21 23:54:55 -070061 return 0;
62}
63
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070064static void reset_policy(struct tcf_defact *d, char *defdata,
65 struct tc_defact *p)
David S. Millere9ce1cd2006-08-21 23:54:55 -070066{
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070067 spin_lock_bh(&d->tcf_lock);
68 d->tcf_action = p->action;
69 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
70 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
71 spin_unlock_bh(&d->tcf_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070072}
73
Patrick McHardy53b2bf32008-01-23 20:36:30 -080074static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
75 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070076 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080077};
78
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000079static int tcf_simp_init(struct net *net, struct nlattr *nla,
80 struct nlattr *est, struct tc_action *a,
81 int ovr, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070082{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080083 struct nlattr *tb[TCA_DEF_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -070084 struct tc_defact *parm;
85 struct tcf_defact *d;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070086 char *defdata;
Patrick McHardycee63722008-01-23 20:33:32 -080087 int ret = 0, err;
David S. Millere9ce1cd2006-08-21 23:54:55 -070088
Patrick McHardycee63722008-01-23 20:33:32 -080089 if (nla == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -070090 return -EINVAL;
91
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070092 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080093 if (err < 0)
94 return err;
95
Patrick McHardy53b2bf32008-01-23 20:36:30 -080096 if (tb[TCA_DEF_PARMS] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -070097 return -EINVAL;
98
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070099 if (tb[TCA_DEF_DATA] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700100 return -EINVAL;
101
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700102 parm = nla_data(tb[TCA_DEF_PARMS]);
103 defdata = nla_data(tb[TCA_DEF_DATA]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700104
WANG Cong86062032014-02-11 17:07:31 -0800105 if (!tcf_hash_check(parm->index, a, bind)) {
106 ret = tcf_hash_create(parm->index, est, a, sizeof(*d), bind);
107 if (ret)
108 return ret;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700109
WANG Cong86062032014-02-11 17:07:31 -0800110 d = to_defact(a);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700111 ret = alloc_defdata(d, defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700112 if (ret < 0) {
WANG Cong86062032014-02-11 17:07:31 -0800113 tcf_hash_cleanup(a, est);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700114 return ret;
115 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700116 d->tcf_action = parm->action;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700117 ret = ACT_P_CREATED;
118 } else {
WANG Cong86062032014-02-11 17:07:31 -0800119 d = to_defact(a);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500120
121 if (bind)
122 return 0;
WANG Conga5b5c952014-02-11 17:07:32 -0800123 tcf_hash_release(a, bind);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500124 if (!ovr)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700125 return -EEXIST;
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500126
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700127 reset_policy(d, defdata, parm);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700128 }
129
David S. Millere9ce1cd2006-08-21 23:54:55 -0700130 if (ret == ACT_P_CREATED)
WANG Cong86062032014-02-11 17:07:31 -0800131 tcf_hash_insert(a);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700132 return ret;
133}
134
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000135static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
136 int bind, int ref)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700137{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700138 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700139 struct tcf_defact *d = a->priv;
Eric Dumazet1c40be12010-08-16 20:04:22 +0000140 struct tc_defact opt = {
141 .index = d->tcf_index,
142 .refcnt = d->tcf_refcnt - ref,
143 .bindcnt = d->tcf_bindcnt - bind,
144 .action = d->tcf_action,
145 };
David S. Millere9ce1cd2006-08-21 23:54:55 -0700146 struct tcf_t t;
147
David S. Miller1b34ec42012-03-29 05:11:39 -0400148 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
149 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
150 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700151 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
152 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
153 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
David S. Miller1b34ec42012-03-29 05:11:39 -0400154 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
155 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700156 return skb->len;
157
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800158nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700159 nlmsg_trim(skb, b);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700160 return -1;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700161}
162
163static struct tc_action_ops act_simp_ops = {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700164 .kind = "simple",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700165 .type = TCA_ACT_SIMP,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 .owner = THIS_MODULE,
167 .act = tcf_simp,
168 .dump = tcf_simp_dump,
WANG Cong86062032014-02-11 17:07:31 -0800169 .cleanup = tcf_simp_release,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700170 .init = tcf_simp_init,
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700171};
172
173MODULE_AUTHOR("Jamal Hadi Salim(2005)");
174MODULE_DESCRIPTION("Simple example action");
175MODULE_LICENSE("GPL");
176
177static int __init simp_init_module(void)
178{
WANG Cong4f1e9d82014-02-11 17:07:33 -0800179 int ret;
180 ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700181 if (!ret)
stephen hemminger6ff9c362010-05-12 06:37:05 +0000182 pr_info("Simple TC action Loaded\n");
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700183 return ret;
184}
185
186static void __exit simp_cleanup_module(void)
187{
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700188 tcf_unregister_action(&act_simp_ops);
189}
190
191module_init(simp_init_module);
192module_exit(simp_cleanup_module);