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net_sched: act: hide struct tcf_common from API
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CommitLineData
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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 *
fa1b1cff 9 * Authors: Jamal Hadi Salim (2005-8)
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10 *
11 */
12
cbdbf00a 13#include <linux/module.h>
5a0e3ad6 14#include <linux/slab.h>
cbdbf00a 15#include <linux/init.h>
db753079 16#include <linux/kernel.h>
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17#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
dc5fc579 19#include <net/netlink.h>
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20#include <net/pkt_sched.h>
21
22#define TCA_ACT_SIMP 22
23
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24#include <linux/tc_act/tc_defact.h>
25#include <net/tc_act/tc_defact.h>
26
e9ce1cd3 27#define SIMP_TAB_MASK 7
369ba567 28static struct tcf_hashinfo simp_hash_info;
db753079 29
fa1b1cff 30#define SIMP_MAX_DATA 32
dc7f9f6e
ED
31static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
32 struct tcf_result *res)
db753079 33{
e9ce1cd3 34 struct tcf_defact *d = a->priv;
db753079 35
e9ce1cd3
DM
36 spin_lock(&d->tcf_lock);
37 d->tcf_tm.lastuse = jiffies;
bfe0d029 38 bstats_update(&d->tcf_bstats, skb);
db753079 39
10297b99
YH
40 /* print policy string followed by _ then packet count
41 * Example if this was the 3rd packet and the string was "hello"
42 * then it would look like "hello_3" (without quotes)
cc7ec456 43 */
6ff9c364 44 pr_info("simple: %s_%d\n",
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45 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
46 spin_unlock(&d->tcf_lock);
47 return d->tcf_action;
48}
49
86062033 50static int tcf_simp_release(struct tc_action *a, int bind)
e9ce1cd3 51{
86062033 52 struct tcf_defact *d = to_defact(a);
e9ce1cd3
DM
53 int ret = 0;
54 if (d) {
55 if (bind)
56 d->tcf_bindcnt--;
57 d->tcf_refcnt--;
58 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
59 kfree(d->tcfd_defdata);
86062033 60 tcf_hash_destroy(a);
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61 ret = 1;
62 }
63 }
64 return ret;
65}
66
fa1b1cff 67static int alloc_defdata(struct tcf_defact *d, char *defdata)
e9ce1cd3 68{
0eff683f 69 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
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70 if (unlikely(!d->tcfd_defdata))
71 return -ENOMEM;
0eff683f 72 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
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73 return 0;
74}
75
9d1045ad
JHS
76static void reset_policy(struct tcf_defact *d, char *defdata,
77 struct tc_defact *p)
e9ce1cd3 78{
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79 spin_lock_bh(&d->tcf_lock);
80 d->tcf_action = p->action;
81 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
82 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
83 spin_unlock_bh(&d->tcf_lock);
e9ce1cd3
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84}
85
53b2bf3f
PM
86static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
87 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
fa1b1cff 88 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
53b2bf3f
PM
89};
90
c1b52739
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91static int tcf_simp_init(struct net *net, struct nlattr *nla,
92 struct nlattr *est, struct tc_action *a,
93 int ovr, int bind)
e9ce1cd3 94{
7ba699c6 95 struct nlattr *tb[TCA_DEF_MAX + 1];
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DM
96 struct tc_defact *parm;
97 struct tcf_defact *d;
fa1b1cff 98 char *defdata;
cee63723 99 int ret = 0, err;
e9ce1cd3 100
cee63723 101 if (nla == NULL)
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102 return -EINVAL;
103
fa1b1cff 104 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
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105 if (err < 0)
106 return err;
107
53b2bf3f 108 if (tb[TCA_DEF_PARMS] == NULL)
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109 return -EINVAL;
110
fa1b1cff 111 if (tb[TCA_DEF_DATA] == NULL)
e9ce1cd3
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112 return -EINVAL;
113
fa1b1cff
JHS
114 parm = nla_data(tb[TCA_DEF_PARMS]);
115 defdata = nla_data(tb[TCA_DEF_DATA]);
e9ce1cd3 116
86062033
WC
117 if (!tcf_hash_check(parm->index, a, bind)) {
118 ret = tcf_hash_create(parm->index, est, a, sizeof(*d), bind);
119 if (ret)
120 return ret;
e9ce1cd3 121
86062033 122 d = to_defact(a);
fa1b1cff 123 ret = alloc_defdata(d, defdata);
e9ce1cd3 124 if (ret < 0) {
86062033 125 tcf_hash_cleanup(a, est);
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126 return ret;
127 }
9d1045ad 128 d->tcf_action = parm->action;
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129 ret = ACT_P_CREATED;
130 } else {
86062033 131 d = to_defact(a);
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132
133 if (bind)
134 return 0;
86062033 135 tcf_simp_release(a, bind);
1a29321e 136 if (!ovr)
e9ce1cd3 137 return -EEXIST;
1a29321e 138
9d1045ad 139 reset_policy(d, defdata, parm);
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140 }
141
e9ce1cd3 142 if (ret == ACT_P_CREATED)
86062033 143 tcf_hash_insert(a);
e9ce1cd3
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144 return ret;
145}
146
cc7ec456
ED
147static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
148 int bind, int ref)
e9ce1cd3 149{
27a884dc 150 unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3 151 struct tcf_defact *d = a->priv;
1c40be12
ED
152 struct tc_defact opt = {
153 .index = d->tcf_index,
154 .refcnt = d->tcf_refcnt - ref,
155 .bindcnt = d->tcf_bindcnt - bind,
156 .action = d->tcf_action,
157 };
e9ce1cd3
DM
158 struct tcf_t t;
159
1b34ec43
DM
160 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
161 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
162 goto nla_put_failure;
e9ce1cd3
DM
163 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
164 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
165 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
1b34ec43
DM
166 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
167 goto nla_put_failure;
e9ce1cd3
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168 return skb->len;
169
7ba699c6 170nla_put_failure:
dc5fc579 171 nlmsg_trim(skb, b);
e9ce1cd3 172 return -1;
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173}
174
175static struct tc_action_ops act_simp_ops = {
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176 .kind = "simple",
177 .hinfo = &simp_hash_info,
178 .type = TCA_ACT_SIMP,
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179 .owner = THIS_MODULE,
180 .act = tcf_simp,
181 .dump = tcf_simp_dump,
86062033 182 .cleanup = tcf_simp_release,
e9ce1cd3 183 .init = tcf_simp_init,
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184};
185
186MODULE_AUTHOR("Jamal Hadi Salim(2005)");
187MODULE_DESCRIPTION("Simple example action");
188MODULE_LICENSE("GPL");
189
190static int __init simp_init_module(void)
191{
369ba567 192 int err, ret;
568a153a 193 err = tcf_hashinfo_init(&simp_hash_info, SIMP_TAB_MASK);
369ba567
WC
194 if (err)
195 return err;
196
197 ret = tcf_register_action(&act_simp_ops);
db753079 198 if (!ret)
6ff9c364 199 pr_info("Simple TC action Loaded\n");
369ba567
WC
200 else
201 tcf_hashinfo_destroy(&simp_hash_info);
202
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203 return ret;
204}
205
206static void __exit simp_cleanup_module(void)
207{
369ba567 208 tcf_hashinfo_destroy(&simp_hash_info);
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209 tcf_unregister_action(&act_simp_ops);
210}
211
212module_init(simp_init_module);
213module_exit(simp_cleanup_module);