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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>
14#include <linux/init.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070015#include <linux/kernel.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070016#include <linux/skbuff.h>
17#include <linux/rtnetlink.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070018#include <net/netlink.h>
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070019#include <net/pkt_sched.h>
20
21#define TCA_ACT_SIMP 22
22
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070023#include <linux/tc_act/tc_defact.h>
24#include <net/tc_act/tc_defact.h>
25
David S. Millere9ce1cd2006-08-21 23:54:55 -070026#define SIMP_TAB_MASK 7
27static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
28static u32 simp_idx_gen;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070029static DEFINE_RWLOCK(simp_lock);
30
Adrian Bunk28a7b322006-08-30 15:03:07 -070031static struct tcf_hashinfo simp_hash_info = {
David S. Millere9ce1cd2006-08-21 23:54:55 -070032 .htab = tcf_simp_ht,
33 .hmask = SIMP_TAB_MASK,
34 .lock = &simp_lock,
35};
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070036
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070037#define SIMP_MAX_DATA 32
Patrick McHardyf43c5a02006-01-08 22:15:34 -080038static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070039{
David S. Millere9ce1cd2006-08-21 23:54:55 -070040 struct tcf_defact *d = a->priv;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070041
David S. Millere9ce1cd2006-08-21 23:54:55 -070042 spin_lock(&d->tcf_lock);
43 d->tcf_tm.lastuse = jiffies;
44 d->tcf_bstats.bytes += skb->len;
45 d->tcf_bstats.packets++;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070046
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090047 /* print policy string followed by _ then packet count
48 * Example if this was the 3rd packet and the string was "hello"
49 * then it would look like "hello_3" (without quotes)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070050 **/
David S. Millere9ce1cd2006-08-21 23:54:55 -070051 printk("simple: %s_%d\n",
52 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
53 spin_unlock(&d->tcf_lock);
54 return d->tcf_action;
55}
56
57static int tcf_simp_release(struct tcf_defact *d, int bind)
58{
59 int ret = 0;
60 if (d) {
61 if (bind)
62 d->tcf_bindcnt--;
63 d->tcf_refcnt--;
64 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
65 kfree(d->tcfd_defdata);
66 tcf_hash_destroy(&d->common, &simp_hash_info);
67 ret = 1;
68 }
69 }
70 return ret;
71}
72
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070073static int alloc_defdata(struct tcf_defact *d, char *defdata)
David S. Millere9ce1cd2006-08-21 23:54:55 -070074{
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070075 d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -070076 if (unlikely(!d->tcfd_defdata))
77 return -ENOMEM;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070078
David S. Millere9ce1cd2006-08-21 23:54:55 -070079 return 0;
80}
81
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070082static void reset_policy(struct tcf_defact *d, char *defdata,
83 struct tc_defact *p)
David S. Millere9ce1cd2006-08-21 23:54:55 -070084{
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -070085 spin_lock_bh(&d->tcf_lock);
86 d->tcf_action = p->action;
87 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
88 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
89 spin_unlock_bh(&d->tcf_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070090}
91
Patrick McHardy53b2bf32008-01-23 20:36:30 -080092static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
93 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -070094 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080095};
96
Patrick McHardy7ba699c2008-01-22 22:11:50 -080097static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -070098 struct tc_action *a, int ovr, int bind)
99{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800100 struct nlattr *tb[TCA_DEF_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 struct tc_defact *parm;
102 struct tcf_defact *d;
103 struct tcf_common *pc;
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700104 char *defdata;
Patrick McHardycee63722008-01-23 20:33:32 -0800105 int ret = 0, err;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700106
Patrick McHardycee63722008-01-23 20:33:32 -0800107 if (nla == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700108 return -EINVAL;
109
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700110 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800111 if (err < 0)
112 return err;
113
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800114 if (tb[TCA_DEF_PARMS] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700115 return -EINVAL;
116
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700117 if (tb[TCA_DEF_DATA] == NULL)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700118 return -EINVAL;
119
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700120 parm = nla_data(tb[TCA_DEF_PARMS]);
121 defdata = nla_data(tb[TCA_DEF_DATA]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700122
123 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
124 if (!pc) {
125 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
126 &simp_idx_gen, &simp_hash_info);
127 if (unlikely(!pc))
128 return -ENOMEM;
129
130 d = to_defact(pc);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700131 ret = alloc_defdata(d, defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700132 if (ret < 0) {
133 kfree(pc);
134 return ret;
135 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700136 d->tcf_action = parm->action;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700137 ret = ACT_P_CREATED;
138 } else {
139 d = to_defact(pc);
140 if (!ovr) {
141 tcf_simp_release(d, bind);
142 return -EEXIST;
143 }
Jamal Hadi Salim9d1045a2008-05-06 00:10:24 -0700144 reset_policy(d, defdata, parm);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 }
146
David S. Millere9ce1cd2006-08-21 23:54:55 -0700147 if (ret == ACT_P_CREATED)
148 tcf_hash_insert(pc, &simp_hash_info);
149 return ret;
150}
151
152static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
153{
154 struct tcf_defact *d = a->priv;
155
156 if (d)
157 return tcf_simp_release(d, bind);
158 return 0;
159}
160
161static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
162 int bind, int ref)
163{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700164 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700165 struct tcf_defact *d = a->priv;
166 struct tc_defact opt;
167 struct tcf_t t;
168
169 opt.index = d->tcf_index;
170 opt.refcnt = d->tcf_refcnt - ref;
171 opt.bindcnt = d->tcf_bindcnt - bind;
172 opt.action = d->tcf_action;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800173 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
Jamal Hadi Salimfa1b1cf2008-05-05 00:22:35 -0700174 NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700175 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
176 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
177 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800178 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700179 return skb->len;
180
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800181nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700182 nlmsg_trim(skb, b);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700183 return -1;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700184}
185
186static struct tc_action_ops act_simp_ops = {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700187 .kind = "simple",
188 .hinfo = &simp_hash_info,
189 .type = TCA_ACT_SIMP,
190 .capab = TCA_CAP_NONE,
191 .owner = THIS_MODULE,
192 .act = tcf_simp,
193 .dump = tcf_simp_dump,
194 .cleanup = tcf_simp_cleanup,
195 .init = tcf_simp_init,
196 .walk = tcf_generic_walker,
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700197};
198
199MODULE_AUTHOR("Jamal Hadi Salim(2005)");
200MODULE_DESCRIPTION("Simple example action");
201MODULE_LICENSE("GPL");
202
203static int __init simp_init_module(void)
204{
205 int ret = tcf_register_action(&act_simp_ops);
206 if (!ret)
207 printk("Simple TC action Loaded\n");
208 return ret;
209}
210
211static void __exit simp_cleanup_module(void)
212{
213 tcf_unregister_action(&act_simp_ops);
214}
215
216module_init(simp_init_module);
217module_exit(simp_cleanup_module);