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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
WANG Congddf97cc2016-02-22 15:57:53 -080029static int simp_net_id;
30
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070031#define SIMP_MAX_DATA 32
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000032static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
33 struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070034{
David S. Millere9ce1cd2006-08-21 23:54:55 -070035 struct tcf_defact *d = a->priv;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070036
David S. Millere9ce1cd2006-08-21 23:54:55 -070037 spin_lock(&d->tcf_lock);
38 d->tcf_tm.lastuse = jiffies;
Eric Dumazetbfe0d022011-01-09 08:30:54 +000039 bstats_update(&d->tcf_bstats, skb);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070040
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090041 /* print policy string followed by _ then packet count
42 * Example if this was the 3rd packet and the string was "hello"
43 * then it would look like "hello_3" (without quotes)
Eric Dumazetcc7ec452011-01-19 19:26:56 +000044 */
stephen hemminger6ff9c362010-05-12 06:37:05 +000045 pr_info("simple: %s_%d\n",
David S. Millere9ce1cd2006-08-21 23:54:55 -070046 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
47 spin_unlock(&d->tcf_lock);
48 return d->tcf_action;
49}
50
WANG Conga5b5c952014-02-11 17:07:32 -080051static void tcf_simp_release(struct tc_action *a, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070052{
WANG Cong86062032014-02-11 17:07:31 -080053 struct tcf_defact *d = to_defact(a);
WANG Conga5b5c952014-02-11 17:07:32 -080054 kfree(d->tcfd_defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -070055}
56
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070057static int alloc_defdata(struct tcf_defact *d, char *defdata)
David S. Millere9ce1cd2006-08-21 23:54:55 -070058{
Dan Carpenter0eff6832010-07-14 17:56:37 -070059 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -070060 if (unlikely(!d->tcfd_defdata))
61 return -ENOMEM;
Dan Carpenter0eff6832010-07-14 17:56:37 -070062 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
David S. Millere9ce1cd2006-08-21 23:54:55 -070063 return 0;
64}
65
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070066static void reset_policy(struct tcf_defact *d, char *defdata,
67 struct tc_defact *p)
David S. Millere9ce1cd2006-08-21 23:54:55 -070068{
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070069 spin_lock_bh(&d->tcf_lock);
70 d->tcf_action = p->action;
71 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
72 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
73 spin_unlock_bh(&d->tcf_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070074}
75
Patrick McHardy53b2bf32008-01-23 20:36:30 -080076static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
77 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070078 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080079};
80
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000081static int tcf_simp_init(struct net *net, struct nlattr *nla,
82 struct nlattr *est, struct tc_action *a,
83 int ovr, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070084{
WANG Congddf97cc2016-02-22 15:57:53 -080085 struct tc_action_net *tn = net_generic(net, simp_net_id);
Patrick McHardy7ba699c2008-01-22 22:11:50 -080086 struct nlattr *tb[TCA_DEF_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -070087 struct tc_defact *parm;
88 struct tcf_defact *d;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070089 char *defdata;
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -040090 int ret = 0, err, exists = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -070091
Patrick McHardycee63722008-01-23 20:33:32 -080092 if (nla == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -070093 return -EINVAL;
94
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070095 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080096 if (err < 0)
97 return err;
98
Patrick McHardy53b2bf32008-01-23 20:36:30 -080099 if (tb[TCA_DEF_PARMS] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700100 return -EINVAL;
101
David S. Millere9ce1cd2006-08-21 23:54:55 -0700102
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700103 parm = nla_data(tb[TCA_DEF_PARMS]);
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -0400104 exists = tcf_hash_check(tn, parm->index, a, bind);
105 if (exists && bind)
106 return 0;
107
108 if (tb[TCA_DEF_DATA] == NULL) {
109 if (exists)
110 tcf_hash_release(a, bind);
111 return -EINVAL;
112 }
113
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700114 defdata = nla_data(tb[TCA_DEF_DATA]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700115
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -0400116 if (!exists) {
WANG Congddf97cc2016-02-22 15:57:53 -0800117 ret = tcf_hash_create(tn, parm->index, est, a,
118 sizeof(*d), bind, false);
WANG Cong86062032014-02-11 17:07:31 -0800119 if (ret)
120 return ret;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700121
WANG Cong86062032014-02-11 17:07:31 -0800122 d = to_defact(a);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700123 ret = alloc_defdata(d, defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700124 if (ret < 0) {
WANG Cong86062032014-02-11 17:07:31 -0800125 tcf_hash_cleanup(a, est);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 return ret;
127 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700128 d->tcf_action = parm->action;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700129 ret = ACT_P_CREATED;
130 } else {
WANG Cong86062032014-02-11 17:07:31 -0800131 d = to_defact(a);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500132
WANG Conga5b5c952014-02-11 17:07:32 -0800133 tcf_hash_release(a, bind);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500134 if (!ovr)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700135 return -EEXIST;
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500136
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700137 reset_policy(d, defdata, parm);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700138 }
139
David S. Millere9ce1cd2006-08-21 23:54:55 -0700140 if (ret == ACT_P_CREATED)
WANG Congddf97cc2016-02-22 15:57:53 -0800141 tcf_hash_insert(tn, a);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142 return ret;
143}
144
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000145static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
146 int bind, int ref)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700147{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700148 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700149 struct tcf_defact *d = a->priv;
Eric Dumazet1c40be12010-08-16 20:04:22 +0000150 struct tc_defact opt = {
151 .index = d->tcf_index,
152 .refcnt = d->tcf_refcnt - ref,
153 .bindcnt = d->tcf_bindcnt - bind,
154 .action = d->tcf_action,
155 };
David S. Millere9ce1cd2006-08-21 23:54:55 -0700156 struct tcf_t t;
157
David S. Miller1b34ec42012-03-29 05:11:39 -0400158 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
159 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
160 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700161 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
162 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
163 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
Nicolas Dichtel98545182016-04-26 10:06:18 +0200164 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
David S. Miller1b34ec42012-03-29 05:11:39 -0400165 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 return skb->len;
167
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800168nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700169 nlmsg_trim(skb, b);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700170 return -1;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700171}
172
WANG Congddf97cc2016-02-22 15:57:53 -0800173static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
174 struct netlink_callback *cb, int type,
175 struct tc_action *a)
176{
177 struct tc_action_net *tn = net_generic(net, simp_net_id);
178
179 return tcf_generic_walker(tn, skb, cb, type, a);
180}
181
182static int tcf_simp_search(struct net *net, struct tc_action *a, u32 index)
183{
184 struct tc_action_net *tn = net_generic(net, simp_net_id);
185
186 return tcf_hash_search(tn, a, index);
187}
188
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700189static struct tc_action_ops act_simp_ops = {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700190 .kind = "simple",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700191 .type = TCA_ACT_SIMP,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700192 .owner = THIS_MODULE,
193 .act = tcf_simp,
194 .dump = tcf_simp_dump,
WANG Cong86062032014-02-11 17:07:31 -0800195 .cleanup = tcf_simp_release,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700196 .init = tcf_simp_init,
WANG Congddf97cc2016-02-22 15:57:53 -0800197 .walk = tcf_simp_walker,
198 .lookup = tcf_simp_search,
199};
200
201static __net_init int simp_init_net(struct net *net)
202{
203 struct tc_action_net *tn = net_generic(net, simp_net_id);
204
205 return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
206}
207
208static void __net_exit simp_exit_net(struct net *net)
209{
210 struct tc_action_net *tn = net_generic(net, simp_net_id);
211
212 tc_action_net_exit(tn);
213}
214
215static struct pernet_operations simp_net_ops = {
216 .init = simp_init_net,
217 .exit = simp_exit_net,
218 .id = &simp_net_id,
219 .size = sizeof(struct tc_action_net),
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700220};
221
222MODULE_AUTHOR("Jamal Hadi Salim(2005)");
223MODULE_DESCRIPTION("Simple example action");
224MODULE_LICENSE("GPL");
225
226static int __init simp_init_module(void)
227{
WANG Congddf97cc2016-02-22 15:57:53 -0800228 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700229 if (!ret)
stephen hemminger6ff9c362010-05-12 06:37:05 +0000230 pr_info("Simple TC action Loaded\n");
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700231 return ret;
232}
233
234static void __exit simp_cleanup_module(void)
235{
WANG Congddf97cc2016-02-22 15:57:53 -0800236 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700237}
238
239module_init(simp_init_module);
240module_exit(simp_cleanup_module);