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