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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 *
9 * Authors: Jamal Hadi Salim (2005)
10 *
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/netdevice.h>
17#include <linux/skbuff.h>
18#include <linux/rtnetlink.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
Patrick McHardyf43c5a02006-01-08 22:15:34 -080037static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070038{
David S. Millere9ce1cd2006-08-21 23:54:55 -070039 struct tcf_defact *d = a->priv;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070040
David S. Millere9ce1cd2006-08-21 23:54:55 -070041 spin_lock(&d->tcf_lock);
42 d->tcf_tm.lastuse = jiffies;
43 d->tcf_bstats.bytes += skb->len;
44 d->tcf_bstats.packets++;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -070045
46 /* print policy string followed by _ then packet count
47 * Example if this was the 3rd packet and the string was "hello"
48 * then it would look like "hello_3" (without quotes)
49 **/
David S. Millere9ce1cd2006-08-21 23:54:55 -070050 printk("simple: %s_%d\n",
51 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
52 spin_unlock(&d->tcf_lock);
53 return d->tcf_action;
54}
55
56static int tcf_simp_release(struct tcf_defact *d, int bind)
57{
58 int ret = 0;
59 if (d) {
60 if (bind)
61 d->tcf_bindcnt--;
62 d->tcf_refcnt--;
63 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
64 kfree(d->tcfd_defdata);
65 tcf_hash_destroy(&d->common, &simp_hash_info);
66 ret = 1;
67 }
68 }
69 return ret;
70}
71
72static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
73{
74 d->tcfd_defdata = kmalloc(datalen, GFP_KERNEL);
75 if (unlikely(!d->tcfd_defdata))
76 return -ENOMEM;
77 d->tcfd_datalen = datalen;
78 memcpy(d->tcfd_defdata, defdata, datalen);
79 return 0;
80}
81
82static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
83{
84 kfree(d->tcfd_defdata);
85 return alloc_defdata(d, datalen, defdata);
86}
87
88static int tcf_simp_init(struct rtattr *rta, struct rtattr *est,
89 struct tc_action *a, int ovr, int bind)
90{
91 struct rtattr *tb[TCA_DEF_MAX];
92 struct tc_defact *parm;
93 struct tcf_defact *d;
94 struct tcf_common *pc;
95 void *defdata;
96 u32 datalen = 0;
97 int ret = 0;
98
99 if (rta == NULL || rtattr_parse_nested(tb, TCA_DEF_MAX, rta) < 0)
100 return -EINVAL;
101
102 if (tb[TCA_DEF_PARMS - 1] == NULL ||
103 RTA_PAYLOAD(tb[TCA_DEF_PARMS - 1]) < sizeof(*parm))
104 return -EINVAL;
105
106 parm = RTA_DATA(tb[TCA_DEF_PARMS - 1]);
107 defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);
108 if (defdata == NULL)
109 return -EINVAL;
110
111 datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);
112 if (datalen <= 0)
113 return -EINVAL;
114
115 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
116 if (!pc) {
117 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
118 &simp_idx_gen, &simp_hash_info);
119 if (unlikely(!pc))
120 return -ENOMEM;
121
122 d = to_defact(pc);
123 ret = alloc_defdata(d, datalen, defdata);
124 if (ret < 0) {
125 kfree(pc);
126 return ret;
127 }
128 ret = ACT_P_CREATED;
129 } else {
130 d = to_defact(pc);
131 if (!ovr) {
132 tcf_simp_release(d, bind);
133 return -EEXIST;
134 }
135 realloc_defdata(d, datalen, defdata);
136 }
137
138 spin_lock_bh(&d->tcf_lock);
139 d->tcf_action = parm->action;
140 spin_unlock_bh(&d->tcf_lock);
141
142 if (ret == ACT_P_CREATED)
143 tcf_hash_insert(pc, &simp_hash_info);
144 return ret;
145}
146
147static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
148{
149 struct tcf_defact *d = a->priv;
150
151 if (d)
152 return tcf_simp_release(d, bind);
153 return 0;
154}
155
156static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
157 int bind, int ref)
158{
159 unsigned char *b = skb->tail;
160 struct tcf_defact *d = a->priv;
161 struct tc_defact opt;
162 struct tcf_t t;
163
164 opt.index = d->tcf_index;
165 opt.refcnt = d->tcf_refcnt - ref;
166 opt.bindcnt = d->tcf_bindcnt - bind;
167 opt.action = d->tcf_action;
168 RTA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
169 RTA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
170 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
171 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
172 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
173 RTA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
174 return skb->len;
175
176rtattr_failure:
177 skb_trim(skb, b - skb->data);
178 return -1;
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700179}
180
181static struct tc_action_ops act_simp_ops = {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700182 .kind = "simple",
183 .hinfo = &simp_hash_info,
184 .type = TCA_ACT_SIMP,
185 .capab = TCA_CAP_NONE,
186 .owner = THIS_MODULE,
187 .act = tcf_simp,
188 .dump = tcf_simp_dump,
189 .cleanup = tcf_simp_cleanup,
190 .init = tcf_simp_init,
191 .walk = tcf_generic_walker,
Jamal Hadi Salimdb753072005-04-24 20:10:16 -0700192};
193
194MODULE_AUTHOR("Jamal Hadi Salim(2005)");
195MODULE_DESCRIPTION("Simple example action");
196MODULE_LICENSE("GPL");
197
198static int __init simp_init_module(void)
199{
200 int ret = tcf_register_action(&act_simp_ops);
201 if (!ret)
202 printk("Simple TC action Loaded\n");
203 return ret;
204}
205
206static void __exit simp_cleanup_module(void)
207{
208 tcf_unregister_action(&act_simp_ops);
209}
210
211module_init(simp_init_module);
212module_exit(simp_cleanup_module);