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1/*
2 * net/sched/act_gact.c Generic actions
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 * copyright Jamal Hadi Salim (2002-4)
10 *
11 */
12
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/string.h>
16#include <linux/errno.h>
17#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <net/netlink.h>
22#include <net/pkt_sched.h>
23#include <linux/tc_act/tc_gact.h>
24#include <net/tc_act/tc_gact.h>
25
26#define GACT_TAB_MASK 15
27
28static int gact_net_id;
29
30#ifdef CONFIG_GACT_PROB
31static int gact_net_rand(struct tcf_gact *gact)
32{
33 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
34 if (prandom_u32() % gact->tcfg_pval)
35 return gact->tcf_action;
36 return gact->tcfg_paction;
37}
38
39static int gact_determ(struct tcf_gact *gact)
40{
41 u32 pack = atomic_inc_return(&gact->packets);
42
43 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
44 if (pack % gact->tcfg_pval)
45 return gact->tcf_action;
46 return gact->tcfg_paction;
47}
48
49typedef int (*g_rand)(struct tcf_gact *gact);
50static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
51#endif /* CONFIG_GACT_PROB */
52
53static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
54 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
55 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
56};
57
58static int tcf_gact_init(struct net *net, struct nlattr *nla,
59 struct nlattr *est, struct tc_action *a,
60 int ovr, int bind)
61{
62 struct tc_action_net *tn = net_generic(net, gact_net_id);
63 struct nlattr *tb[TCA_GACT_MAX + 1];
64 struct tc_gact *parm;
65 struct tcf_gact *gact;
66 int ret = 0;
67 int err;
68#ifdef CONFIG_GACT_PROB
69 struct tc_gact_p *p_parm = NULL;
70#endif
71
72 if (nla == NULL)
73 return -EINVAL;
74
75 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
76 if (err < 0)
77 return err;
78
79 if (tb[TCA_GACT_PARMS] == NULL)
80 return -EINVAL;
81 parm = nla_data(tb[TCA_GACT_PARMS]);
82
83#ifndef CONFIG_GACT_PROB
84 if (tb[TCA_GACT_PROB] != NULL)
85 return -EOPNOTSUPP;
86#else
87 if (tb[TCA_GACT_PROB]) {
88 p_parm = nla_data(tb[TCA_GACT_PROB]);
89 if (p_parm->ptype >= MAX_RAND)
90 return -EINVAL;
91 }
92#endif
93
94 if (!tcf_hash_check(tn, parm->index, a, bind)) {
95 ret = tcf_hash_create(tn, parm->index, est, a,
96 sizeof(*gact), bind, true);
97 if (ret)
98 return ret;
99 ret = ACT_P_CREATED;
100 } else {
101 if (bind)/* dont override defaults */
102 return 0;
103 tcf_hash_release(a, bind);
104 if (!ovr)
105 return -EEXIST;
106 }
107
108 gact = to_gact(a);
109
110 ASSERT_RTNL();
111 gact->tcf_action = parm->action;
112#ifdef CONFIG_GACT_PROB
113 if (p_parm) {
114 gact->tcfg_paction = p_parm->paction;
115 gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
116 /* Make sure tcfg_pval is written before tcfg_ptype
117 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
118 */
119 smp_wmb();
120 gact->tcfg_ptype = p_parm->ptype;
121 }
122#endif
123 if (ret == ACT_P_CREATED)
124 tcf_hash_insert(tn, a);
125 return ret;
126}
127
128static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
129 struct tcf_result *res)
130{
131 struct tcf_gact *gact = a->priv;
132 int action = READ_ONCE(gact->tcf_action);
133
134#ifdef CONFIG_GACT_PROB
135 {
136 u32 ptype = READ_ONCE(gact->tcfg_ptype);
137
138 if (ptype)
139 action = gact_rand[ptype](gact);
140 }
141#endif
142 bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
143 if (action == TC_ACT_SHOT)
144 qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
145
146 tcf_lastuse_update(&gact->tcf_tm);
147
148 return action;
149}
150
151static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
152{
153 unsigned char *b = skb_tail_pointer(skb);
154 struct tcf_gact *gact = a->priv;
155 struct tc_gact opt = {
156 .index = gact->tcf_index,
157 .refcnt = gact->tcf_refcnt - ref,
158 .bindcnt = gact->tcf_bindcnt - bind,
159 .action = gact->tcf_action,
160 };
161 struct tcf_t t;
162
163 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
164 goto nla_put_failure;
165#ifdef CONFIG_GACT_PROB
166 if (gact->tcfg_ptype) {
167 struct tc_gact_p p_opt = {
168 .paction = gact->tcfg_paction,
169 .pval = gact->tcfg_pval,
170 .ptype = gact->tcfg_ptype,
171 };
172
173 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
174 goto nla_put_failure;
175 }
176#endif
177 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
178 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
179 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
180 if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
181 goto nla_put_failure;
182 return skb->len;
183
184nla_put_failure:
185 nlmsg_trim(skb, b);
186 return -1;
187}
188
189static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
190 struct netlink_callback *cb, int type,
191 struct tc_action *a)
192{
193 struct tc_action_net *tn = net_generic(net, gact_net_id);
194
195 return tcf_generic_walker(tn, skb, cb, type, a);
196}
197
198static int tcf_gact_search(struct net *net, struct tc_action *a, u32 index)
199{
200 struct tc_action_net *tn = net_generic(net, gact_net_id);
201
202 return tcf_hash_search(tn, a, index);
203}
204
205static struct tc_action_ops act_gact_ops = {
206 .kind = "gact",
207 .type = TCA_ACT_GACT,
208 .owner = THIS_MODULE,
209 .act = tcf_gact,
210 .dump = tcf_gact_dump,
211 .init = tcf_gact_init,
212 .walk = tcf_gact_walker,
213 .lookup = tcf_gact_search,
214};
215
216static __net_init int gact_init_net(struct net *net)
217{
218 struct tc_action_net *tn = net_generic(net, gact_net_id);
219
220 return tc_action_net_init(tn, &act_gact_ops, GACT_TAB_MASK);
221}
222
223static void __net_exit gact_exit_net(struct net *net)
224{
225 struct tc_action_net *tn = net_generic(net, gact_net_id);
226
227 tc_action_net_exit(tn);
228}
229
230static struct pernet_operations gact_net_ops = {
231 .init = gact_init_net,
232 .exit = gact_exit_net,
233 .id = &gact_net_id,
234 .size = sizeof(struct tc_action_net),
235};
236
237MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
238MODULE_DESCRIPTION("Generic Classifier actions");
239MODULE_LICENSE("GPL");
240
241static int __init gact_init_module(void)
242{
243#ifdef CONFIG_GACT_PROB
244 pr_info("GACT probability on\n");
245#else
246 pr_info("GACT probability NOT on\n");
247#endif
248
249 return tcf_register_action(&act_gact_ops, &gact_net_ops);
250}
251
252static void __exit gact_cleanup_module(void)
253{
254 tcf_unregister_action(&act_gact_ops, &gact_net_ops);
255}
256
257module_init(gact_init_module);
258module_exit(gact_cleanup_module);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_gact.c Generic actions
4 *
5 * copyright Jamal Hadi Salim (2002-4)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <net/netlink.h>
17#include <net/pkt_sched.h>
18#include <net/pkt_cls.h>
19#include <linux/tc_act/tc_gact.h>
20#include <net/tc_act/tc_gact.h>
21
22static unsigned int gact_net_id;
23static struct tc_action_ops act_gact_ops;
24
25#ifdef CONFIG_GACT_PROB
26static int gact_net_rand(struct tcf_gact *gact)
27{
28 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
29 if (prandom_u32() % gact->tcfg_pval)
30 return gact->tcf_action;
31 return gact->tcfg_paction;
32}
33
34static int gact_determ(struct tcf_gact *gact)
35{
36 u32 pack = atomic_inc_return(&gact->packets);
37
38 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
39 if (pack % gact->tcfg_pval)
40 return gact->tcf_action;
41 return gact->tcfg_paction;
42}
43
44typedef int (*g_rand)(struct tcf_gact *gact);
45static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
46#endif /* CONFIG_GACT_PROB */
47
48static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
49 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
50 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
51};
52
53static int tcf_gact_init(struct net *net, struct nlattr *nla,
54 struct nlattr *est, struct tc_action **a,
55 int ovr, int bind, bool rtnl_held,
56 struct tcf_proto *tp, struct netlink_ext_ack *extack)
57{
58 struct tc_action_net *tn = net_generic(net, gact_net_id);
59 struct nlattr *tb[TCA_GACT_MAX + 1];
60 struct tcf_chain *goto_ch = NULL;
61 struct tc_gact *parm;
62 struct tcf_gact *gact;
63 int ret = 0;
64 u32 index;
65 int err;
66#ifdef CONFIG_GACT_PROB
67 struct tc_gact_p *p_parm = NULL;
68#endif
69
70 if (nla == NULL)
71 return -EINVAL;
72
73 err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
74 NULL);
75 if (err < 0)
76 return err;
77
78 if (tb[TCA_GACT_PARMS] == NULL)
79 return -EINVAL;
80 parm = nla_data(tb[TCA_GACT_PARMS]);
81 index = parm->index;
82
83#ifndef CONFIG_GACT_PROB
84 if (tb[TCA_GACT_PROB] != NULL)
85 return -EOPNOTSUPP;
86#else
87 if (tb[TCA_GACT_PROB]) {
88 p_parm = nla_data(tb[TCA_GACT_PROB]);
89 if (p_parm->ptype >= MAX_RAND)
90 return -EINVAL;
91 if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
92 NL_SET_ERR_MSG(extack,
93 "goto chain not allowed on fallback");
94 return -EINVAL;
95 }
96 }
97#endif
98
99 err = tcf_idr_check_alloc(tn, &index, a, bind);
100 if (!err) {
101 ret = tcf_idr_create(tn, index, est, a,
102 &act_gact_ops, bind, true);
103 if (ret) {
104 tcf_idr_cleanup(tn, index);
105 return ret;
106 }
107 ret = ACT_P_CREATED;
108 } else if (err > 0) {
109 if (bind)/* dont override defaults */
110 return 0;
111 if (!ovr) {
112 tcf_idr_release(*a, bind);
113 return -EEXIST;
114 }
115 } else {
116 return err;
117 }
118
119 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
120 if (err < 0)
121 goto release_idr;
122 gact = to_gact(*a);
123
124 spin_lock_bh(&gact->tcf_lock);
125 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
126#ifdef CONFIG_GACT_PROB
127 if (p_parm) {
128 gact->tcfg_paction = p_parm->paction;
129 gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
130 /* Make sure tcfg_pval is written before tcfg_ptype
131 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
132 */
133 smp_wmb();
134 gact->tcfg_ptype = p_parm->ptype;
135 }
136#endif
137 spin_unlock_bh(&gact->tcf_lock);
138
139 if (goto_ch)
140 tcf_chain_put_by_act(goto_ch);
141
142 if (ret == ACT_P_CREATED)
143 tcf_idr_insert(tn, *a);
144 return ret;
145release_idr:
146 tcf_idr_release(*a, bind);
147 return err;
148}
149
150static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
151 struct tcf_result *res)
152{
153 struct tcf_gact *gact = to_gact(a);
154 int action = READ_ONCE(gact->tcf_action);
155
156#ifdef CONFIG_GACT_PROB
157 {
158 u32 ptype = READ_ONCE(gact->tcfg_ptype);
159
160 if (ptype)
161 action = gact_rand[ptype](gact);
162 }
163#endif
164 bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
165 if (action == TC_ACT_SHOT)
166 qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
167
168 tcf_lastuse_update(&gact->tcf_tm);
169
170 return action;
171}
172
173static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
174 u64 lastuse, bool hw)
175{
176 struct tcf_gact *gact = to_gact(a);
177 int action = READ_ONCE(gact->tcf_action);
178 struct tcf_t *tm = &gact->tcf_tm;
179
180 _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
181 packets);
182 if (action == TC_ACT_SHOT)
183 this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
184
185 if (hw)
186 _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats_hw),
187 bytes, packets);
188
189 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
190}
191
192static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
193 int bind, int ref)
194{
195 unsigned char *b = skb_tail_pointer(skb);
196 struct tcf_gact *gact = to_gact(a);
197 struct tc_gact opt = {
198 .index = gact->tcf_index,
199 .refcnt = refcount_read(&gact->tcf_refcnt) - ref,
200 .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
201 };
202 struct tcf_t t;
203
204 spin_lock_bh(&gact->tcf_lock);
205 opt.action = gact->tcf_action;
206 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
207 goto nla_put_failure;
208#ifdef CONFIG_GACT_PROB
209 if (gact->tcfg_ptype) {
210 struct tc_gact_p p_opt = {
211 .paction = gact->tcfg_paction,
212 .pval = gact->tcfg_pval,
213 .ptype = gact->tcfg_ptype,
214 };
215
216 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
217 goto nla_put_failure;
218 }
219#endif
220 tcf_tm_dump(&t, &gact->tcf_tm);
221 if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
222 goto nla_put_failure;
223 spin_unlock_bh(&gact->tcf_lock);
224
225 return skb->len;
226
227nla_put_failure:
228 spin_unlock_bh(&gact->tcf_lock);
229 nlmsg_trim(skb, b);
230 return -1;
231}
232
233static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
234 struct netlink_callback *cb, int type,
235 const struct tc_action_ops *ops,
236 struct netlink_ext_ack *extack)
237{
238 struct tc_action_net *tn = net_generic(net, gact_net_id);
239
240 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
241}
242
243static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
244{
245 struct tc_action_net *tn = net_generic(net, gact_net_id);
246
247 return tcf_idr_search(tn, a, index);
248}
249
250static size_t tcf_gact_get_fill_size(const struct tc_action *act)
251{
252 size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
253
254#ifdef CONFIG_GACT_PROB
255 if (to_gact(act)->tcfg_ptype)
256 /* TCA_GACT_PROB */
257 sz += nla_total_size(sizeof(struct tc_gact_p));
258#endif
259
260 return sz;
261}
262
263static struct tc_action_ops act_gact_ops = {
264 .kind = "gact",
265 .id = TCA_ID_GACT,
266 .owner = THIS_MODULE,
267 .act = tcf_gact_act,
268 .stats_update = tcf_gact_stats_update,
269 .dump = tcf_gact_dump,
270 .init = tcf_gact_init,
271 .walk = tcf_gact_walker,
272 .lookup = tcf_gact_search,
273 .get_fill_size = tcf_gact_get_fill_size,
274 .size = sizeof(struct tcf_gact),
275};
276
277static __net_init int gact_init_net(struct net *net)
278{
279 struct tc_action_net *tn = net_generic(net, gact_net_id);
280
281 return tc_action_net_init(net, tn, &act_gact_ops);
282}
283
284static void __net_exit gact_exit_net(struct list_head *net_list)
285{
286 tc_action_net_exit(net_list, gact_net_id);
287}
288
289static struct pernet_operations gact_net_ops = {
290 .init = gact_init_net,
291 .exit_batch = gact_exit_net,
292 .id = &gact_net_id,
293 .size = sizeof(struct tc_action_net),
294};
295
296MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
297MODULE_DESCRIPTION("Generic Classifier actions");
298MODULE_LICENSE("GPL");
299
300static int __init gact_init_module(void)
301{
302#ifdef CONFIG_GACT_PROB
303 pr_info("GACT probability on\n");
304#else
305 pr_info("GACT probability NOT on\n");
306#endif
307
308 return tcf_register_action(&act_gact_ops, &gact_net_ops);
309}
310
311static void __exit gact_cleanup_module(void)
312{
313 tcf_unregister_action(&act_gact_ops, &gact_net_ops);
314}
315
316module_init(gact_init_module);
317module_exit(gact_cleanup_module);