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1/*
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
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13#include <linux/module.h>
14#include <linux/init.h>
db753079 15#include <linux/kernel.h>
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16#include <linux/skbuff.h>
17#include <linux/rtnetlink.h>
dc5fc579 18#include <net/netlink.h>
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19#include <net/pkt_sched.h>
20
21#define TCA_ACT_SIMP 22
22
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23#include <linux/tc_act/tc_defact.h>
24#include <net/tc_act/tc_defact.h>
25
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26#define SIMP_TAB_MASK 7
27static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
28static u32 simp_idx_gen;
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29static DEFINE_RWLOCK(simp_lock);
30
28a7b327 31static struct tcf_hashinfo simp_hash_info = {
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32 .htab = tcf_simp_ht,
33 .hmask = SIMP_TAB_MASK,
34 .lock = &simp_lock,
35};
db753079 36
f43c5a0d 37static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
db753079 38{
e9ce1cd3 39 struct tcf_defact *d = a->priv;
db753079 40
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41 spin_lock(&d->tcf_lock);
42 d->tcf_tm.lastuse = jiffies;
43 d->tcf_bstats.bytes += skb->len;
44 d->tcf_bstats.packets++;
db753079 45
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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)
db753079 49 **/
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50 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{
c7b1b249 74 d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);
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75 if (unlikely(!d->tcfd_defdata))
76 return -ENOMEM;
77 d->tcfd_datalen = datalen;
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78 return 0;
79}
80
81static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
82{
83 kfree(d->tcfd_defdata);
84 return alloc_defdata(d, datalen, defdata);
85}
86
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87static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
88 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
89};
90
7ba699c6 91static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
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92 struct tc_action *a, int ovr, int bind)
93{
7ba699c6 94 struct nlattr *tb[TCA_DEF_MAX + 1];
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95 struct tc_defact *parm;
96 struct tcf_defact *d;
97 struct tcf_common *pc;
98 void *defdata;
99 u32 datalen = 0;
cee63723 100 int ret = 0, err;
e9ce1cd3 101
cee63723 102 if (nla == NULL)
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103 return -EINVAL;
104
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105 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, NULL);
106 if (err < 0)
107 return err;
108
53b2bf3f 109 if (tb[TCA_DEF_PARMS] == NULL)
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110 return -EINVAL;
111
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112 parm = nla_data(tb[TCA_DEF_PARMS]);
113 defdata = nla_data(tb[TCA_DEF_DATA]);
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114 if (defdata == NULL)
115 return -EINVAL;
116
7ba699c6 117 datalen = nla_len(tb[TCA_DEF_DATA]);
f5ba2d32 118 if (datalen == 0)
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119 return -EINVAL;
120
121 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
122 if (!pc) {
123 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
124 &simp_idx_gen, &simp_hash_info);
125 if (unlikely(!pc))
126 return -ENOMEM;
127
128 d = to_defact(pc);
129 ret = alloc_defdata(d, datalen, defdata);
130 if (ret < 0) {
131 kfree(pc);
132 return ret;
133 }
134 ret = ACT_P_CREATED;
135 } else {
136 d = to_defact(pc);
137 if (!ovr) {
138 tcf_simp_release(d, bind);
139 return -EEXIST;
140 }
141 realloc_defdata(d, datalen, defdata);
142 }
143
144 spin_lock_bh(&d->tcf_lock);
145 d->tcf_action = parm->action;
146 spin_unlock_bh(&d->tcf_lock);
147
148 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{
27a884dc 165 unsigned char *b = skb_tail_pointer(skb);
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166 struct tcf_defact *d = a->priv;
167 struct tc_defact opt;
168 struct tcf_t t;
169
170 opt.index = d->tcf_index;
171 opt.refcnt = d->tcf_refcnt - ref;
172 opt.bindcnt = d->tcf_bindcnt - bind;
173 opt.action = d->tcf_action;
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174 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
175 NLA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
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176 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
177 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
178 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
7ba699c6 179 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
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180 return skb->len;
181
7ba699c6 182nla_put_failure:
dc5fc579 183 nlmsg_trim(skb, b);
e9ce1cd3 184 return -1;
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185}
186
187static struct tc_action_ops act_simp_ops = {
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188 .kind = "simple",
189 .hinfo = &simp_hash_info,
190 .type = TCA_ACT_SIMP,
191 .capab = TCA_CAP_NONE,
192 .owner = THIS_MODULE,
193 .act = tcf_simp,
194 .dump = tcf_simp_dump,
195 .cleanup = tcf_simp_cleanup,
196 .init = tcf_simp_init,
197 .walk = tcf_generic_walker,
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198};
199
200MODULE_AUTHOR("Jamal Hadi Salim(2005)");
201MODULE_DESCRIPTION("Simple example action");
202MODULE_LICENSE("GPL");
203
204static int __init simp_init_module(void)
205{
206 int ret = tcf_register_action(&act_simp_ops);
207 if (!ret)
208 printk("Simple TC action Loaded\n");
209 return ret;
210}
211
212static void __exit simp_cleanup_module(void)
213{
214 tcf_unregister_action(&act_simp_ops);
215}
216
217module_init(simp_init_module);
218module_exit(simp_cleanup_module);