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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#include <net/tc_wrapper.h>
18
19#include <linux/tc_act/tc_defact.h>
20#include <net/tc_act/tc_defact.h>
21
22static struct tc_action_ops act_simp_ops;
23
24#define SIMP_MAX_DATA 32
25TC_INDIRECT_SCOPE int tcf_simp_act(struct sk_buff *skb,
26 const struct tc_action *a,
27 struct tcf_result *res)
28{
29 struct tcf_defact *d = to_defact(a);
30
31 spin_lock(&d->tcf_lock);
32 tcf_lastuse_update(&d->tcf_tm);
33 bstats_update(&d->tcf_bstats, skb);
34
35 /* print policy string followed by _ then packet count
36 * Example if this was the 3rd packet and the string was "hello"
37 * then it would look like "hello_3" (without quotes)
38 */
39 pr_info("simple: %s_%llu\n",
40 (char *)d->tcfd_defdata,
41 u64_stats_read(&d->tcf_bstats.packets));
42 spin_unlock(&d->tcf_lock);
43 return d->tcf_action;
44}
45
46static void tcf_simp_release(struct tc_action *a)
47{
48 struct tcf_defact *d = to_defact(a);
49 kfree(d->tcfd_defdata);
50}
51
52static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
53{
54 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
55 if (unlikely(!d->tcfd_defdata))
56 return -ENOMEM;
57 nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
58 return 0;
59}
60
61static int reset_policy(struct tc_action *a, const struct nlattr *defdata,
62 struct tc_defact *p, struct tcf_proto *tp,
63 struct netlink_ext_ack *extack)
64{
65 struct tcf_chain *goto_ch = NULL;
66 struct tcf_defact *d;
67 int err;
68
69 err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack);
70 if (err < 0)
71 return err;
72 d = to_defact(a);
73 spin_lock_bh(&d->tcf_lock);
74 goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch);
75 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
76 nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
77 spin_unlock_bh(&d->tcf_lock);
78 if (goto_ch)
79 tcf_chain_put_by_act(goto_ch);
80 return 0;
81}
82
83static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
84 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
85 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
86};
87
88static int tcf_simp_init(struct net *net, struct nlattr *nla,
89 struct nlattr *est, struct tc_action **a,
90 struct tcf_proto *tp, u32 flags,
91 struct netlink_ext_ack *extack)
92{
93 struct tc_action_net *tn = net_generic(net, act_simp_ops.net_id);
94 bool bind = flags & TCA_ACT_FLAGS_BIND;
95 struct nlattr *tb[TCA_DEF_MAX + 1];
96 struct tcf_chain *goto_ch = NULL;
97 struct tc_defact *parm;
98 struct tcf_defact *d;
99 bool exists = false;
100 int ret = 0, err;
101 u32 index;
102
103 if (nla == NULL)
104 return -EINVAL;
105
106 err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy,
107 NULL);
108 if (err < 0)
109 return err;
110
111 if (tb[TCA_DEF_PARMS] == NULL)
112 return -EINVAL;
113
114 parm = nla_data(tb[TCA_DEF_PARMS]);
115 index = parm->index;
116 err = tcf_idr_check_alloc(tn, &index, a, bind);
117 if (err < 0)
118 return err;
119 exists = err;
120 if (exists && bind)
121 return ACT_P_BOUND;
122
123 if (tb[TCA_DEF_DATA] == NULL) {
124 if (exists)
125 tcf_idr_release(*a, bind);
126 else
127 tcf_idr_cleanup(tn, index);
128 return -EINVAL;
129 }
130
131 if (!exists) {
132 ret = tcf_idr_create(tn, index, est, a,
133 &act_simp_ops, bind, false, flags);
134 if (ret) {
135 tcf_idr_cleanup(tn, index);
136 return ret;
137 }
138
139 d = to_defact(*a);
140 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
141 extack);
142 if (err < 0)
143 goto release_idr;
144
145 err = alloc_defdata(d, tb[TCA_DEF_DATA]);
146 if (err < 0)
147 goto put_chain;
148
149 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
150 ret = ACT_P_CREATED;
151 } else {
152 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
153 err = -EEXIST;
154 goto release_idr;
155 }
156
157 err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack);
158 if (err)
159 goto release_idr;
160 }
161
162 return ret;
163put_chain:
164 if (goto_ch)
165 tcf_chain_put_by_act(goto_ch);
166release_idr:
167 tcf_idr_release(*a, bind);
168 return err;
169}
170
171static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
172 int bind, int ref)
173{
174 unsigned char *b = skb_tail_pointer(skb);
175 struct tcf_defact *d = to_defact(a);
176 struct tc_defact opt = {
177 .index = d->tcf_index,
178 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
179 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
180 };
181 struct tcf_t t;
182
183 spin_lock_bh(&d->tcf_lock);
184 opt.action = d->tcf_action;
185 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
186 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
187 goto nla_put_failure;
188
189 tcf_tm_dump(&t, &d->tcf_tm);
190 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
191 goto nla_put_failure;
192 spin_unlock_bh(&d->tcf_lock);
193
194 return skb->len;
195
196nla_put_failure:
197 spin_unlock_bh(&d->tcf_lock);
198 nlmsg_trim(skb, b);
199 return -1;
200}
201
202static struct tc_action_ops act_simp_ops = {
203 .kind = "simple",
204 .id = TCA_ID_SIMP,
205 .owner = THIS_MODULE,
206 .act = tcf_simp_act,
207 .dump = tcf_simp_dump,
208 .cleanup = tcf_simp_release,
209 .init = tcf_simp_init,
210 .size = sizeof(struct tcf_defact),
211};
212MODULE_ALIAS_NET_ACT("simple");
213
214static __net_init int simp_init_net(struct net *net)
215{
216 struct tc_action_net *tn = net_generic(net, act_simp_ops.net_id);
217
218 return tc_action_net_init(net, tn, &act_simp_ops);
219}
220
221static void __net_exit simp_exit_net(struct list_head *net_list)
222{
223 tc_action_net_exit(net_list, act_simp_ops.net_id);
224}
225
226static struct pernet_operations simp_net_ops = {
227 .init = simp_init_net,
228 .exit_batch = simp_exit_net,
229 .id = &act_simp_ops.net_id,
230 .size = sizeof(struct tc_action_net),
231};
232
233MODULE_AUTHOR("Jamal Hadi Salim(2005)");
234MODULE_DESCRIPTION("Simple example action");
235MODULE_LICENSE("GPL");
236
237static int __init simp_init_module(void)
238{
239 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
240 if (!ret)
241 pr_info("Simple TC action Loaded\n");
242 return ret;
243}
244
245static void __exit simp_cleanup_module(void)
246{
247 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
248}
249
250module_init(simp_init_module);
251module_exit(simp_cleanup_module);
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);