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Jamal Hadi Salimdb753072005-04-24 20:10:16 -07001/*
2 * net/sched/simp.c Simple example of an action
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 *
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
28static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
29static u32 simp_idx_gen;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070030static DEFINE_RWLOCK(simp_lock);
31
Adrian Bunk28a7b322006-08-30 15:03:07 -070032static struct tcf_hashinfo simp_hash_info = {
David S. Millere9ce1cd2006-08-21 23:54:55 -070033 .htab = tcf_simp_ht,
34 .hmask = SIMP_TAB_MASK,
35 .lock = &simp_lock,
36};
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070037
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070038#define SIMP_MAX_DATA 32
Patrick McHardyf43c5a02006-01-08 22:15:34 -080039static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070040{
David S. Millere9ce1cd2006-08-21 23:54:55 -070041 struct tcf_defact *d = a->priv;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070042
David S. Millere9ce1cd2006-08-21 23:54:55 -070043 spin_lock(&d->tcf_lock);
44 d->tcf_tm.lastuse = jiffies;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -070045 d->tcf_bstats.bytes += qdisc_pkt_len(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -070046 d->tcf_bstats.packets++;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070047
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090048 /* print policy string followed by _ then packet count
49 * Example if this was the 3rd packet and the string was "hello"
50 * then it would look like "hello_3" (without quotes)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070051 **/
stephen hemminger6ff9c362010-05-12 06:37:05 +000052 pr_info("simple: %s_%d\n",
David S. Millere9ce1cd2006-08-21 23:54:55 -070053 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
54 spin_unlock(&d->tcf_lock);
55 return d->tcf_action;
56}
57
58static int tcf_simp_release(struct tcf_defact *d, int bind)
59{
60 int ret = 0;
61 if (d) {
62 if (bind)
63 d->tcf_bindcnt--;
64 d->tcf_refcnt--;
65 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
66 kfree(d->tcfd_defdata);
67 tcf_hash_destroy(&d->common, &simp_hash_info);
68 ret = 1;
69 }
70 }
71 return ret;
72}
73
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070074static int alloc_defdata(struct tcf_defact *d, char *defdata)
David S. Millere9ce1cd2006-08-21 23:54:55 -070075{
Dan Carpenter0eff6832010-07-14 17:56:37 -070076 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -070077 if (unlikely(!d->tcfd_defdata))
78 return -ENOMEM;
Dan Carpenter0eff6832010-07-14 17:56:37 -070079 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
David S. Millere9ce1cd2006-08-21 23:54:55 -070080 return 0;
81}
82
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070083static void reset_policy(struct tcf_defact *d, char *defdata,
84 struct tc_defact *p)
David S. Millere9ce1cd2006-08-21 23:54:55 -070085{
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070086 spin_lock_bh(&d->tcf_lock);
87 d->tcf_action = p->action;
88 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
89 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
90 spin_unlock_bh(&d->tcf_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070091}
92
Patrick McHardy53b2bf32008-01-23 20:36:30 -080093static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
94 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070095 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080096};
97
Patrick McHardy7ba699c2008-01-22 22:11:50 -080098static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -070099 struct tc_action *a, int ovr, int bind)
100{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800101 struct nlattr *tb[TCA_DEF_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -0700102 struct tc_defact *parm;
103 struct tcf_defact *d;
104 struct tcf_common *pc;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700105 char *defdata;
Patrick McHardycee63722008-01-23 20:33:32 -0800106 int ret = 0, err;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700107
Patrick McHardycee63722008-01-23 20:33:32 -0800108 if (nla == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700109 return -EINVAL;
110
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700111 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800112 if (err < 0)
113 return err;
114
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800115 if (tb[TCA_DEF_PARMS] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700116 return -EINVAL;
117
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700118 if (tb[TCA_DEF_DATA] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700119 return -EINVAL;
120
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700121 parm = nla_data(tb[TCA_DEF_PARMS]);
122 defdata = nla_data(tb[TCA_DEF_DATA]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123
124 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
125 if (!pc) {
126 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
127 &simp_idx_gen, &simp_hash_info);
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800128 if (IS_ERR(pc))
129 return PTR_ERR(pc);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700130
131 d = to_defact(pc);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700132 ret = alloc_defdata(d, defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700133 if (ret < 0) {
134 kfree(pc);
135 return ret;
136 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700137 d->tcf_action = parm->action;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700138 ret = ACT_P_CREATED;
139 } else {
140 d = to_defact(pc);
141 if (!ovr) {
142 tcf_simp_release(d, bind);
143 return -EEXIST;
144 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700145 reset_policy(d, defdata, parm);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700146 }
147
David S. Millere9ce1cd2006-08-21 23:54:55 -0700148 if (ret == ACT_P_CREATED)
149 tcf_hash_insert(pc, &simp_hash_info);
150 return ret;
151}
152
153static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
154{
155 struct tcf_defact *d = a->priv;
156
157 if (d)
158 return tcf_simp_release(d, bind);
159 return 0;
160}
161
162static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
163 int bind, int ref)
164{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700165 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 struct tcf_defact *d = a->priv;
Eric Dumazet1c40be12010-08-16 20:04:22 +0000167 struct tc_defact opt = {
168 .index = d->tcf_index,
169 .refcnt = d->tcf_refcnt - ref,
170 .bindcnt = d->tcf_bindcnt - bind,
171 .action = d->tcf_action,
172 };
David S. Millere9ce1cd2006-08-21 23:54:55 -0700173 struct tcf_t t;
174
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800175 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700176 NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700177 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
178 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
179 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800180 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700181 return skb->len;
182
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800183nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700184 nlmsg_trim(skb, b);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700185 return -1;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700186}
187
188static struct tc_action_ops act_simp_ops = {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700189 .kind = "simple",
190 .hinfo = &simp_hash_info,
191 .type = TCA_ACT_SIMP,
192 .capab = TCA_CAP_NONE,
193 .owner = THIS_MODULE,
194 .act = tcf_simp,
195 .dump = tcf_simp_dump,
196 .cleanup = tcf_simp_cleanup,
197 .init = tcf_simp_init,
198 .walk = tcf_generic_walker,
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700199};
200
201MODULE_AUTHOR("Jamal Hadi Salim(2005)");
202MODULE_DESCRIPTION("Simple example action");
203MODULE_LICENSE("GPL");
204
205static int __init simp_init_module(void)
206{
207 int ret = tcf_register_action(&act_simp_ops);
208 if (!ret)
stephen hemminger6ff9c362010-05-12 06:37:05 +0000209 pr_info("Simple TC action Loaded\n");
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700210 return ret;
211}
212
213static void __exit simp_cleanup_module(void)
214{
215 tcf_unregister_action(&act_simp_ops);
216}
217
218module_init(simp_init_module);
219module_exit(simp_cleanup_module);