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1/*
2 * net/sched/act_simple.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 (2005-8)
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
19#include <net/netlink.h>
20#include <net/pkt_sched.h>
21
22#define TCA_ACT_SIMP 22
23
24#include <linux/tc_act/tc_defact.h>
25#include <net/tc_act/tc_defact.h>
26
27#define SIMP_TAB_MASK 7
28
29static int simp_net_id;
30
31#define SIMP_MAX_DATA 32
32static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
33 struct tcf_result *res)
34{
35 struct tcf_defact *d = a->priv;
36
37 spin_lock(&d->tcf_lock);
38 d->tcf_tm.lastuse = jiffies;
39 bstats_update(&d->tcf_bstats, skb);
40
41 /* print policy string followed by _ then packet count
42 * Example if this was the 3rd packet and the string was "hello"
43 * then it would look like "hello_3" (without quotes)
44 */
45 pr_info("simple: %s_%d\n",
46 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
47 spin_unlock(&d->tcf_lock);
48 return d->tcf_action;
49}
50
51static void tcf_simp_release(struct tc_action *a, int bind)
52{
53 struct tcf_defact *d = to_defact(a);
54 kfree(d->tcfd_defdata);
55}
56
57static int alloc_defdata(struct tcf_defact *d, char *defdata)
58{
59 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
60 if (unlikely(!d->tcfd_defdata))
61 return -ENOMEM;
62 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
63 return 0;
64}
65
66static void reset_policy(struct tcf_defact *d, char *defdata,
67 struct tc_defact *p)
68{
69 spin_lock_bh(&d->tcf_lock);
70 d->tcf_action = p->action;
71 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
72 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
73 spin_unlock_bh(&d->tcf_lock);
74}
75
76static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
77 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
78 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
79};
80
81static int tcf_simp_init(struct net *net, struct nlattr *nla,
82 struct nlattr *est, struct tc_action *a,
83 int ovr, int bind)
84{
85 struct tc_action_net *tn = net_generic(net, simp_net_id);
86 struct nlattr *tb[TCA_DEF_MAX + 1];
87 struct tc_defact *parm;
88 struct tcf_defact *d;
89 char *defdata;
90 int ret = 0, err, exists = 0;
91
92 if (nla == NULL)
93 return -EINVAL;
94
95 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
96 if (err < 0)
97 return err;
98
99 if (tb[TCA_DEF_PARMS] == NULL)
100 return -EINVAL;
101
102
103 parm = nla_data(tb[TCA_DEF_PARMS]);
104 exists = tcf_hash_check(tn, parm->index, a, bind);
105 if (exists && bind)
106 return 0;
107
108 if (tb[TCA_DEF_DATA] == NULL) {
109 if (exists)
110 tcf_hash_release(a, bind);
111 return -EINVAL;
112 }
113
114 defdata = nla_data(tb[TCA_DEF_DATA]);
115
116 if (!exists) {
117 ret = tcf_hash_create(tn, parm->index, est, a,
118 sizeof(*d), bind, false);
119 if (ret)
120 return ret;
121
122 d = to_defact(a);
123 ret = alloc_defdata(d, defdata);
124 if (ret < 0) {
125 tcf_hash_cleanup(a, est);
126 return ret;
127 }
128 d->tcf_action = parm->action;
129 ret = ACT_P_CREATED;
130 } else {
131 d = to_defact(a);
132
133 tcf_hash_release(a, bind);
134 if (!ovr)
135 return -EEXIST;
136
137 reset_policy(d, defdata, parm);
138 }
139
140 if (ret == ACT_P_CREATED)
141 tcf_hash_insert(tn, a);
142 return ret;
143}
144
145static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
146 int bind, int ref)
147{
148 unsigned char *b = skb_tail_pointer(skb);
149 struct tcf_defact *d = a->priv;
150 struct tc_defact opt = {
151 .index = d->tcf_index,
152 .refcnt = d->tcf_refcnt - ref,
153 .bindcnt = d->tcf_bindcnt - bind,
154 .action = d->tcf_action,
155 };
156 struct tcf_t t;
157
158 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
159 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
160 goto nla_put_failure;
161 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
162 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
163 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
164 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
165 goto nla_put_failure;
166 return skb->len;
167
168nla_put_failure:
169 nlmsg_trim(skb, b);
170 return -1;
171}
172
173static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
174 struct netlink_callback *cb, int type,
175 struct tc_action *a)
176{
177 struct tc_action_net *tn = net_generic(net, simp_net_id);
178
179 return tcf_generic_walker(tn, skb, cb, type, a);
180}
181
182static int tcf_simp_search(struct net *net, struct tc_action *a, u32 index)
183{
184 struct tc_action_net *tn = net_generic(net, simp_net_id);
185
186 return tcf_hash_search(tn, a, index);
187}
188
189static struct tc_action_ops act_simp_ops = {
190 .kind = "simple",
191 .type = TCA_ACT_SIMP,
192 .owner = THIS_MODULE,
193 .act = tcf_simp,
194 .dump = tcf_simp_dump,
195 .cleanup = tcf_simp_release,
196 .init = tcf_simp_init,
197 .walk = tcf_simp_walker,
198 .lookup = tcf_simp_search,
199};
200
201static __net_init int simp_init_net(struct net *net)
202{
203 struct tc_action_net *tn = net_generic(net, simp_net_id);
204
205 return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
206}
207
208static void __net_exit simp_exit_net(struct net *net)
209{
210 struct tc_action_net *tn = net_generic(net, simp_net_id);
211
212 tc_action_net_exit(tn);
213}
214
215static struct pernet_operations simp_net_ops = {
216 .init = simp_init_net,
217 .exit = simp_exit_net,
218 .id = &simp_net_id,
219 .size = sizeof(struct tc_action_net),
220};
221
222MODULE_AUTHOR("Jamal Hadi Salim(2005)");
223MODULE_DESCRIPTION("Simple example action");
224MODULE_LICENSE("GPL");
225
226static int __init simp_init_module(void)
227{
228 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
229 if (!ret)
230 pr_info("Simple TC action Loaded\n");
231 return ret;
232}
233
234static void __exit simp_cleanup_module(void)
235{
236 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
237}
238
239module_init(simp_init_module);
240module_exit(simp_cleanup_module);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_simple.c Simple example of an action
4 *
5 * Authors: Jamal Hadi Salim (2005-8)
6 */
7
8#include <linux/module.h>
9#include <linux/slab.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <net/netlink.h>
15#include <net/pkt_sched.h>
16#include <net/pkt_cls.h>
17
18#include <linux/tc_act/tc_defact.h>
19#include <net/tc_act/tc_defact.h>
20
21static unsigned int simp_net_id;
22static struct tc_action_ops act_simp_ops;
23
24#define SIMP_MAX_DATA 32
25static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a,
26 struct tcf_result *res)
27{
28 struct tcf_defact *d = to_defact(a);
29
30 spin_lock(&d->tcf_lock);
31 tcf_lastuse_update(&d->tcf_tm);
32 bstats_update(&d->tcf_bstats, skb);
33
34 /* print policy string followed by _ then packet count
35 * Example if this was the 3rd packet and the string was "hello"
36 * then it would look like "hello_3" (without quotes)
37 */
38 pr_info("simple: %s_%d\n",
39 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
40 spin_unlock(&d->tcf_lock);
41 return d->tcf_action;
42}
43
44static void tcf_simp_release(struct tc_action *a)
45{
46 struct tcf_defact *d = to_defact(a);
47 kfree(d->tcfd_defdata);
48}
49
50static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
51{
52 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
53 if (unlikely(!d->tcfd_defdata))
54 return -ENOMEM;
55 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
56 return 0;
57}
58
59static int reset_policy(struct tc_action *a, const struct nlattr *defdata,
60 struct tc_defact *p, struct tcf_proto *tp,
61 struct netlink_ext_ack *extack)
62{
63 struct tcf_chain *goto_ch = NULL;
64 struct tcf_defact *d;
65 int err;
66
67 err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack);
68 if (err < 0)
69 return err;
70 d = to_defact(a);
71 spin_lock_bh(&d->tcf_lock);
72 goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch);
73 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
74 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
75 spin_unlock_bh(&d->tcf_lock);
76 if (goto_ch)
77 tcf_chain_put_by_act(goto_ch);
78 return 0;
79}
80
81static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
82 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
83 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
84};
85
86static int tcf_simp_init(struct net *net, struct nlattr *nla,
87 struct nlattr *est, struct tc_action **a,
88 int ovr, int bind, bool rtnl_held,
89 struct tcf_proto *tp, struct netlink_ext_ack *extack)
90{
91 struct tc_action_net *tn = net_generic(net, simp_net_id);
92 struct nlattr *tb[TCA_DEF_MAX + 1];
93 struct tcf_chain *goto_ch = NULL;
94 struct tc_defact *parm;
95 struct tcf_defact *d;
96 bool exists = false;
97 int ret = 0, err;
98 u32 index;
99
100 if (nla == NULL)
101 return -EINVAL;
102
103 err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy,
104 NULL);
105 if (err < 0)
106 return err;
107
108 if (tb[TCA_DEF_PARMS] == NULL)
109 return -EINVAL;
110
111 parm = nla_data(tb[TCA_DEF_PARMS]);
112 index = parm->index;
113 err = tcf_idr_check_alloc(tn, &index, a, bind);
114 if (err < 0)
115 return err;
116 exists = err;
117 if (exists && bind)
118 return 0;
119
120 if (tb[TCA_DEF_DATA] == NULL) {
121 if (exists)
122 tcf_idr_release(*a, bind);
123 else
124 tcf_idr_cleanup(tn, index);
125 return -EINVAL;
126 }
127
128 if (!exists) {
129 ret = tcf_idr_create(tn, index, est, a,
130 &act_simp_ops, bind, false);
131 if (ret) {
132 tcf_idr_cleanup(tn, index);
133 return ret;
134 }
135
136 d = to_defact(*a);
137 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
138 extack);
139 if (err < 0)
140 goto release_idr;
141
142 err = alloc_defdata(d, tb[TCA_DEF_DATA]);
143 if (err < 0)
144 goto put_chain;
145
146 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
147 ret = ACT_P_CREATED;
148 } else {
149 if (!ovr) {
150 err = -EEXIST;
151 goto release_idr;
152 }
153
154 err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack);
155 if (err)
156 goto release_idr;
157 }
158
159 if (ret == ACT_P_CREATED)
160 tcf_idr_insert(tn, *a);
161 return ret;
162put_chain:
163 if (goto_ch)
164 tcf_chain_put_by_act(goto_ch);
165release_idr:
166 tcf_idr_release(*a, bind);
167 return err;
168}
169
170static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
171 int bind, int ref)
172{
173 unsigned char *b = skb_tail_pointer(skb);
174 struct tcf_defact *d = to_defact(a);
175 struct tc_defact opt = {
176 .index = d->tcf_index,
177 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
178 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
179 };
180 struct tcf_t t;
181
182 spin_lock_bh(&d->tcf_lock);
183 opt.action = d->tcf_action;
184 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
185 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
186 goto nla_put_failure;
187
188 tcf_tm_dump(&t, &d->tcf_tm);
189 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
190 goto nla_put_failure;
191 spin_unlock_bh(&d->tcf_lock);
192
193 return skb->len;
194
195nla_put_failure:
196 spin_unlock_bh(&d->tcf_lock);
197 nlmsg_trim(skb, b);
198 return -1;
199}
200
201static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
202 struct netlink_callback *cb, int type,
203 const struct tc_action_ops *ops,
204 struct netlink_ext_ack *extack)
205{
206 struct tc_action_net *tn = net_generic(net, simp_net_id);
207
208 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
209}
210
211static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
212{
213 struct tc_action_net *tn = net_generic(net, simp_net_id);
214
215 return tcf_idr_search(tn, a, index);
216}
217
218static struct tc_action_ops act_simp_ops = {
219 .kind = "simple",
220 .id = TCA_ID_SIMP,
221 .owner = THIS_MODULE,
222 .act = tcf_simp_act,
223 .dump = tcf_simp_dump,
224 .cleanup = tcf_simp_release,
225 .init = tcf_simp_init,
226 .walk = tcf_simp_walker,
227 .lookup = tcf_simp_search,
228 .size = sizeof(struct tcf_defact),
229};
230
231static __net_init int simp_init_net(struct net *net)
232{
233 struct tc_action_net *tn = net_generic(net, simp_net_id);
234
235 return tc_action_net_init(net, tn, &act_simp_ops);
236}
237
238static void __net_exit simp_exit_net(struct list_head *net_list)
239{
240 tc_action_net_exit(net_list, simp_net_id);
241}
242
243static struct pernet_operations simp_net_ops = {
244 .init = simp_init_net,
245 .exit_batch = simp_exit_net,
246 .id = &simp_net_id,
247 .size = sizeof(struct tc_action_net),
248};
249
250MODULE_AUTHOR("Jamal Hadi Salim(2005)");
251MODULE_DESCRIPTION("Simple example action");
252MODULE_LICENSE("GPL");
253
254static int __init simp_init_module(void)
255{
256 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
257 if (!ret)
258 pr_info("Simple TC action Loaded\n");
259 return ret;
260}
261
262static void __exit simp_cleanup_module(void)
263{
264 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
265}
266
267module_init(simp_init_module);
268module_exit(simp_cleanup_module);