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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
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030029static unsigned int simp_net_id;
WANG Conga85a9702016-07-25 16:09:41 -070030static struct tc_action_ops act_simp_ops;
WANG Congddf97cc2016-02-22 15:57:53 -080031
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070032#define SIMP_MAX_DATA 32
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000033static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070035{
WANG Conga85a9702016-07-25 16:09:41 -070036 struct tcf_defact *d = to_defact(a);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070037
David S. Millere9ce1cd2006-08-21 23:54:55 -070038 spin_lock(&d->tcf_lock);
Jamal Hadi Salim9c4a4e42016-06-06 06:32:53 -040039 tcf_lastuse_update(&d->tcf_tm);
Eric Dumazetbfe0d022011-01-09 08:30:54 +000040 bstats_update(&d->tcf_bstats, skb);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070041
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090042 /* print policy string followed by _ then packet count
43 * Example if this was the 3rd packet and the string was "hello"
44 * then it would look like "hello_3" (without quotes)
Eric Dumazetcc7ec452011-01-19 19:26:56 +000045 */
stephen hemminger6ff9c362010-05-12 06:37:05 +000046 pr_info("simple: %s_%d\n",
David S. Millere9ce1cd2006-08-21 23:54:55 -070047 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
48 spin_unlock(&d->tcf_lock);
49 return d->tcf_action;
50}
51
WANG Conga5b5c952014-02-11 17:07:32 -080052static void tcf_simp_release(struct tc_action *a, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070053{
WANG Cong86062032014-02-11 17:07:31 -080054 struct tcf_defact *d = to_defact(a);
WANG Conga5b5c952014-02-11 17:07:32 -080055 kfree(d->tcfd_defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -070056}
57
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070058static int alloc_defdata(struct tcf_defact *d, char *defdata)
David S. Millere9ce1cd2006-08-21 23:54:55 -070059{
Dan Carpenter0eff6832010-07-14 17:56:37 -070060 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -070061 if (unlikely(!d->tcfd_defdata))
62 return -ENOMEM;
Dan Carpenter0eff6832010-07-14 17:56:37 -070063 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
David S. Millere9ce1cd2006-08-21 23:54:55 -070064 return 0;
65}
66
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070067static void reset_policy(struct tcf_defact *d, char *defdata,
68 struct tc_defact *p)
David S. Millere9ce1cd2006-08-21 23:54:55 -070069{
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070070 spin_lock_bh(&d->tcf_lock);
71 d->tcf_action = p->action;
72 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
73 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
74 spin_unlock_bh(&d->tcf_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070075}
76
Patrick McHardy53b2bf32008-01-23 20:36:30 -080077static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
78 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070079 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080080};
81
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000082static int tcf_simp_init(struct net *net, struct nlattr *nla,
WANG Conga85a9702016-07-25 16:09:41 -070083 struct nlattr *est, struct tc_action **a,
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000084 int ovr, int bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070085{
WANG Congddf97cc2016-02-22 15:57:53 -080086 struct tc_action_net *tn = net_generic(net, simp_net_id);
Patrick McHardy7ba699c2008-01-22 22:11:50 -080087 struct nlattr *tb[TCA_DEF_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -070088 struct tc_defact *parm;
89 struct tcf_defact *d;
WANG Congb2313072016-06-13 13:46:28 -070090 bool exists = false;
91 int ret = 0, err;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070092 char *defdata;
David S. Millere9ce1cd2006-08-21 23:54:55 -070093
Patrick McHardycee63722008-01-23 20:33:32 -080094 if (nla == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -070095 return -EINVAL;
96
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070097 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080098 if (err < 0)
99 return err;
100
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800101 if (tb[TCA_DEF_PARMS] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700102 return -EINVAL;
103
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700104 parm = nla_data(tb[TCA_DEF_PARMS]);
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -0400105 exists = tcf_hash_check(tn, parm->index, a, bind);
106 if (exists && bind)
107 return 0;
108
109 if (tb[TCA_DEF_DATA] == NULL) {
110 if (exists)
WANG Conga85a9702016-07-25 16:09:41 -0700111 tcf_hash_release(*a, bind);
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -0400112 return -EINVAL;
113 }
114
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700115 defdata = nla_data(tb[TCA_DEF_DATA]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700116
Jamal Hadi Salim0e5538a2016-05-10 16:49:29 -0400117 if (!exists) {
WANG Congddf97cc2016-02-22 15:57:53 -0800118 ret = tcf_hash_create(tn, parm->index, est, a,
WANG Conga85a9702016-07-25 16:09:41 -0700119 &act_simp_ops, bind, false);
WANG Cong86062032014-02-11 17:07:31 -0800120 if (ret)
121 return ret;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700122
WANG Conga85a9702016-07-25 16:09:41 -0700123 d = to_defact(*a);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700124 ret = alloc_defdata(d, defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700125 if (ret < 0) {
WANG Conga85a9702016-07-25 16:09:41 -0700126 tcf_hash_cleanup(*a, est);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700127 return ret;
128 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700129 d->tcf_action = parm->action;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700130 ret = ACT_P_CREATED;
131 } else {
WANG Conga85a9702016-07-25 16:09:41 -0700132 d = to_defact(*a);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500133
WANG Conga85a9702016-07-25 16:09:41 -0700134 tcf_hash_release(*a, bind);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500135 if (!ovr)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700136 return -EEXIST;
Jamal Hadi Salim1a293212013-12-23 08:02:11 -0500137
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700138 reset_policy(d, defdata, parm);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700139 }
140
David S. Millere9ce1cd2006-08-21 23:54:55 -0700141 if (ret == ACT_P_CREATED)
WANG Conga85a9702016-07-25 16:09:41 -0700142 tcf_hash_insert(tn, *a);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700143 return ret;
144}
145
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000146static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
147 int bind, int ref)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700148{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700149 unsigned char *b = skb_tail_pointer(skb);
WANG Conga85a9702016-07-25 16:09:41 -0700150 struct tcf_defact *d = to_defact(a);
Eric Dumazet1c40be12010-08-16 20:04:22 +0000151 struct tc_defact opt = {
152 .index = d->tcf_index,
153 .refcnt = d->tcf_refcnt - ref,
154 .bindcnt = d->tcf_bindcnt - bind,
155 .action = d->tcf_action,
156 };
David S. Millere9ce1cd2006-08-21 23:54:55 -0700157 struct tcf_t t;
158
David S. Miller1b34ec42012-03-29 05:11:39 -0400159 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
160 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
161 goto nla_put_failure;
Jamal Hadi Salim48d8ee12016-06-06 06:32:55 -0400162
163 tcf_tm_dump(&t, &d->tcf_tm);
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,
WANG Conga85a9702016-07-25 16:09:41 -0700175 const struct tc_action_ops *ops)
WANG Congddf97cc2016-02-22 15:57:53 -0800176{
177 struct tc_action_net *tn = net_generic(net, simp_net_id);
178
WANG Conga85a9702016-07-25 16:09:41 -0700179 return tcf_generic_walker(tn, skb, cb, type, ops);
WANG Congddf97cc2016-02-22 15:57:53 -0800180}
181
WANG Conga85a9702016-07-25 16:09:41 -0700182static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
WANG Congddf97cc2016-02-22 15:57:53 -0800183{
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,
WANG Conga85a9702016-07-25 16:09:41 -0700199 .size = sizeof(struct tcf_defact),
WANG Congddf97cc2016-02-22 15:57:53 -0800200};
201
202static __net_init int simp_init_net(struct net *net)
203{
204 struct tc_action_net *tn = net_generic(net, simp_net_id);
205
206 return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
207}
208
209static void __net_exit simp_exit_net(struct net *net)
210{
211 struct tc_action_net *tn = net_generic(net, simp_net_id);
212
213 tc_action_net_exit(tn);
214}
215
216static struct pernet_operations simp_net_ops = {
217 .init = simp_init_net,
218 .exit = simp_exit_net,
219 .id = &simp_net_id,
220 .size = sizeof(struct tc_action_net),
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700221};
222
223MODULE_AUTHOR("Jamal Hadi Salim(2005)");
224MODULE_DESCRIPTION("Simple example action");
225MODULE_LICENSE("GPL");
226
227static int __init simp_init_module(void)
228{
WANG Congddf97cc2016-02-22 15:57:53 -0800229 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700230 if (!ret)
stephen hemminger6ff9c362010-05-12 06:37:05 +0000231 pr_info("Simple TC action Loaded\n");
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700232 return ret;
233}
234
235static void __exit simp_cleanup_module(void)
236{
WANG Congddf97cc2016-02-22 15:57:53 -0800237 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700238}
239
240module_init(simp_init_module);
241module_exit(simp_cleanup_module);