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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#include <net/tc_wrapper.h>
22
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 (get_random_u32_below(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 struct tcf_proto *tp, u32 flags,
56 struct netlink_ext_ack *extack)
57{
58 struct tc_action_net *tn = net_generic(net, act_gact_ops.net_id);
59 bool bind = flags & TCA_ACT_FLAGS_BIND;
60 struct nlattr *tb[TCA_GACT_MAX + 1];
61 struct tcf_chain *goto_ch = NULL;
62 struct tc_gact *parm;
63 struct tcf_gact *gact;
64 int ret = 0;
65 u32 index;
66 int err;
67#ifdef CONFIG_GACT_PROB
68 struct tc_gact_p *p_parm = NULL;
69#endif
70
71 if (nla == NULL)
72 return -EINVAL;
73
74 err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
75 NULL);
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 index = parm->index;
83
84#ifndef CONFIG_GACT_PROB
85 if (tb[TCA_GACT_PROB] != NULL)
86 return -EOPNOTSUPP;
87#else
88 if (tb[TCA_GACT_PROB]) {
89 p_parm = nla_data(tb[TCA_GACT_PROB]);
90 if (p_parm->ptype >= MAX_RAND)
91 return -EINVAL;
92 if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
93 NL_SET_ERR_MSG(extack,
94 "goto chain not allowed on fallback");
95 return -EINVAL;
96 }
97 }
98#endif
99
100 err = tcf_idr_check_alloc(tn, &index, a, bind);
101 if (!err) {
102 ret = tcf_idr_create_from_flags(tn, index, est, a,
103 &act_gact_ops, bind, flags);
104 if (ret) {
105 tcf_idr_cleanup(tn, index);
106 return ret;
107 }
108 ret = ACT_P_CREATED;
109 } else if (err > 0) {
110 if (bind)/* dont override defaults */
111 return ACT_P_BOUND;
112 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
113 tcf_idr_release(*a, bind);
114 return -EEXIST;
115 }
116 } else {
117 return err;
118 }
119
120 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
121 if (err < 0)
122 goto release_idr;
123 gact = to_gact(*a);
124
125 spin_lock_bh(&gact->tcf_lock);
126 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
127#ifdef CONFIG_GACT_PROB
128 if (p_parm) {
129 gact->tcfg_paction = p_parm->paction;
130 gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
131 /* Make sure tcfg_pval is written before tcfg_ptype
132 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
133 */
134 smp_wmb();
135 gact->tcfg_ptype = p_parm->ptype;
136 }
137#endif
138 spin_unlock_bh(&gact->tcf_lock);
139
140 if (goto_ch)
141 tcf_chain_put_by_act(goto_ch);
142
143 return ret;
144release_idr:
145 tcf_idr_release(*a, bind);
146 return err;
147}
148
149TC_INDIRECT_SCOPE int tcf_gact_act(struct sk_buff *skb,
150 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 tcf_action_update_bstats(&gact->common, skb);
165 if (action == TC_ACT_SHOT)
166 tcf_action_inc_drop_qstats(&gact->common);
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, u64 packets,
174 u64 drops, 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 tcf_action_update_stats(a, bytes, packets,
181 action == TC_ACT_SHOT ? packets : drops, hw);
182 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
183}
184
185static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
186 int bind, int ref)
187{
188 unsigned char *b = skb_tail_pointer(skb);
189 struct tcf_gact *gact = to_gact(a);
190 struct tc_gact opt = {
191 .index = gact->tcf_index,
192 .refcnt = refcount_read(&gact->tcf_refcnt) - ref,
193 .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
194 };
195 struct tcf_t t;
196
197 spin_lock_bh(&gact->tcf_lock);
198 opt.action = gact->tcf_action;
199 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
200 goto nla_put_failure;
201#ifdef CONFIG_GACT_PROB
202 if (gact->tcfg_ptype) {
203 struct tc_gact_p p_opt = {
204 .paction = gact->tcfg_paction,
205 .pval = gact->tcfg_pval,
206 .ptype = gact->tcfg_ptype,
207 };
208
209 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
210 goto nla_put_failure;
211 }
212#endif
213 tcf_tm_dump(&t, &gact->tcf_tm);
214 if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
215 goto nla_put_failure;
216 spin_unlock_bh(&gact->tcf_lock);
217
218 return skb->len;
219
220nla_put_failure:
221 spin_unlock_bh(&gact->tcf_lock);
222 nlmsg_trim(skb, b);
223 return -1;
224}
225
226static size_t tcf_gact_get_fill_size(const struct tc_action *act)
227{
228 size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
229
230#ifdef CONFIG_GACT_PROB
231 if (to_gact(act)->tcfg_ptype)
232 /* TCA_GACT_PROB */
233 sz += nla_total_size(sizeof(struct tc_gact_p));
234#endif
235
236 return sz;
237}
238
239static int tcf_gact_offload_act_setup(struct tc_action *act, void *entry_data,
240 u32 *index_inc, bool bind,
241 struct netlink_ext_ack *extack)
242{
243 if (bind) {
244 struct flow_action_entry *entry = entry_data;
245
246 if (is_tcf_gact_ok(act)) {
247 entry->id = FLOW_ACTION_ACCEPT;
248 } else if (is_tcf_gact_shot(act)) {
249 entry->id = FLOW_ACTION_DROP;
250 } else if (is_tcf_gact_trap(act)) {
251 entry->id = FLOW_ACTION_TRAP;
252 } else if (is_tcf_gact_goto_chain(act)) {
253 entry->id = FLOW_ACTION_GOTO;
254 entry->chain_index = tcf_gact_goto_chain_index(act);
255 } else if (is_tcf_gact_continue(act)) {
256 NL_SET_ERR_MSG_MOD(extack, "Offload of \"continue\" action is not supported");
257 return -EOPNOTSUPP;
258 } else if (is_tcf_gact_reclassify(act)) {
259 NL_SET_ERR_MSG_MOD(extack, "Offload of \"reclassify\" action is not supported");
260 return -EOPNOTSUPP;
261 } else if (is_tcf_gact_pipe(act)) {
262 NL_SET_ERR_MSG_MOD(extack, "Offload of \"pipe\" action is not supported");
263 return -EOPNOTSUPP;
264 } else {
265 NL_SET_ERR_MSG_MOD(extack, "Unsupported generic action offload");
266 return -EOPNOTSUPP;
267 }
268 *index_inc = 1;
269 } else {
270 struct flow_offload_action *fl_action = entry_data;
271
272 if (is_tcf_gact_ok(act))
273 fl_action->id = FLOW_ACTION_ACCEPT;
274 else if (is_tcf_gact_shot(act))
275 fl_action->id = FLOW_ACTION_DROP;
276 else if (is_tcf_gact_trap(act))
277 fl_action->id = FLOW_ACTION_TRAP;
278 else if (is_tcf_gact_goto_chain(act))
279 fl_action->id = FLOW_ACTION_GOTO;
280 else
281 return -EOPNOTSUPP;
282 }
283
284 return 0;
285}
286
287static struct tc_action_ops act_gact_ops = {
288 .kind = "gact",
289 .id = TCA_ID_GACT,
290 .owner = THIS_MODULE,
291 .act = tcf_gact_act,
292 .stats_update = tcf_gact_stats_update,
293 .dump = tcf_gact_dump,
294 .init = tcf_gact_init,
295 .get_fill_size = tcf_gact_get_fill_size,
296 .offload_act_setup = tcf_gact_offload_act_setup,
297 .size = sizeof(struct tcf_gact),
298};
299MODULE_ALIAS_NET_ACT("gact");
300
301static __net_init int gact_init_net(struct net *net)
302{
303 struct tc_action_net *tn = net_generic(net, act_gact_ops.net_id);
304
305 return tc_action_net_init(net, tn, &act_gact_ops);
306}
307
308static void __net_exit gact_exit_net(struct list_head *net_list)
309{
310 tc_action_net_exit(net_list, act_gact_ops.net_id);
311}
312
313static struct pernet_operations gact_net_ops = {
314 .init = gact_init_net,
315 .exit_batch = gact_exit_net,
316 .id = &act_gact_ops.net_id,
317 .size = sizeof(struct tc_action_net),
318};
319
320MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
321MODULE_DESCRIPTION("Generic Classifier actions");
322MODULE_LICENSE("GPL");
323
324static int __init gact_init_module(void)
325{
326#ifdef CONFIG_GACT_PROB
327 pr_info("GACT probability on\n");
328#else
329 pr_info("GACT probability NOT on\n");
330#endif
331
332 return tcf_register_action(&act_gact_ops, &gact_net_ops);
333}
334
335static void __exit gact_cleanup_module(void)
336{
337 tcf_unregister_action(&act_gact_ops, &gact_net_ops);
338}
339
340module_init(gact_init_module);
341module_exit(gact_cleanup_module);
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
26static unsigned int gact_net_id;
27static struct tc_action_ops act_gact_ops;
28
29#ifdef CONFIG_GACT_PROB
30static int gact_net_rand(struct tcf_gact *gact)
31{
32 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
33 if (prandom_u32() % gact->tcfg_pval)
34 return gact->tcf_action;
35 return gact->tcfg_paction;
36}
37
38static int gact_determ(struct tcf_gact *gact)
39{
40 u32 pack = atomic_inc_return(&gact->packets);
41
42 smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
43 if (pack % gact->tcfg_pval)
44 return gact->tcf_action;
45 return gact->tcfg_paction;
46}
47
48typedef int (*g_rand)(struct tcf_gact *gact);
49static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
50#endif /* CONFIG_GACT_PROB */
51
52static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
53 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
54 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
55};
56
57static int tcf_gact_init(struct net *net, struct nlattr *nla,
58 struct nlattr *est, struct tc_action **a,
59 int ovr, int bind, struct netlink_ext_ack *extack)
60{
61 struct tc_action_net *tn = net_generic(net, gact_net_id);
62 struct nlattr *tb[TCA_GACT_MAX + 1];
63 struct tc_gact *parm;
64 struct tcf_gact *gact;
65 int ret = 0;
66 int err;
67#ifdef CONFIG_GACT_PROB
68 struct tc_gact_p *p_parm = NULL;
69#endif
70
71 if (nla == NULL)
72 return -EINVAL;
73
74 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, 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
82#ifndef CONFIG_GACT_PROB
83 if (tb[TCA_GACT_PROB] != NULL)
84 return -EOPNOTSUPP;
85#else
86 if (tb[TCA_GACT_PROB]) {
87 p_parm = nla_data(tb[TCA_GACT_PROB]);
88 if (p_parm->ptype >= MAX_RAND)
89 return -EINVAL;
90 }
91#endif
92
93 if (!tcf_idr_check(tn, parm->index, a, bind)) {
94 ret = tcf_idr_create(tn, parm->index, est, a,
95 &act_gact_ops, bind, true);
96 if (ret)
97 return ret;
98 ret = ACT_P_CREATED;
99 } else {
100 if (bind)/* dont override defaults */
101 return 0;
102 tcf_idr_release(*a, bind);
103 if (!ovr)
104 return -EEXIST;
105 }
106
107 gact = to_gact(*a);
108
109 ASSERT_RTNL();
110 gact->tcf_action = parm->action;
111#ifdef CONFIG_GACT_PROB
112 if (p_parm) {
113 gact->tcfg_paction = p_parm->paction;
114 gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
115 /* Make sure tcfg_pval is written before tcfg_ptype
116 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
117 */
118 smp_wmb();
119 gact->tcfg_ptype = p_parm->ptype;
120 }
121#endif
122 if (ret == ACT_P_CREATED)
123 tcf_idr_insert(tn, *a);
124 return ret;
125}
126
127static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
128 struct tcf_result *res)
129{
130 struct tcf_gact *gact = to_gact(a);
131 int action = READ_ONCE(gact->tcf_action);
132
133#ifdef CONFIG_GACT_PROB
134 {
135 u32 ptype = READ_ONCE(gact->tcfg_ptype);
136
137 if (ptype)
138 action = gact_rand[ptype](gact);
139 }
140#endif
141 bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
142 if (action == TC_ACT_SHOT)
143 qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
144
145 tcf_lastuse_update(&gact->tcf_tm);
146
147 return action;
148}
149
150static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
151 u64 lastuse)
152{
153 struct tcf_gact *gact = to_gact(a);
154 int action = READ_ONCE(gact->tcf_action);
155 struct tcf_t *tm = &gact->tcf_tm;
156
157 _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
158 packets);
159 if (action == TC_ACT_SHOT)
160 this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
161
162 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
163}
164
165static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
166 int bind, int ref)
167{
168 unsigned char *b = skb_tail_pointer(skb);
169 struct tcf_gact *gact = to_gact(a);
170 struct tc_gact opt = {
171 .index = gact->tcf_index,
172 .refcnt = gact->tcf_refcnt - ref,
173 .bindcnt = gact->tcf_bindcnt - bind,
174 .action = gact->tcf_action,
175 };
176 struct tcf_t t;
177
178 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
179 goto nla_put_failure;
180#ifdef CONFIG_GACT_PROB
181 if (gact->tcfg_ptype) {
182 struct tc_gact_p p_opt = {
183 .paction = gact->tcfg_paction,
184 .pval = gact->tcfg_pval,
185 .ptype = gact->tcfg_ptype,
186 };
187
188 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
189 goto nla_put_failure;
190 }
191#endif
192 tcf_tm_dump(&t, &gact->tcf_tm);
193 if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
194 goto nla_put_failure;
195 return skb->len;
196
197nla_put_failure:
198 nlmsg_trim(skb, b);
199 return -1;
200}
201
202static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
203 struct netlink_callback *cb, int type,
204 const struct tc_action_ops *ops,
205 struct netlink_ext_ack *extack)
206{
207 struct tc_action_net *tn = net_generic(net, gact_net_id);
208
209 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
210}
211
212static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index,
213 struct netlink_ext_ack *extack)
214{
215 struct tc_action_net *tn = net_generic(net, gact_net_id);
216
217 return tcf_idr_search(tn, a, index);
218}
219
220static size_t tcf_gact_get_fill_size(const struct tc_action *act)
221{
222 size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
223
224#ifdef CONFIG_GACT_PROB
225 if (to_gact(act)->tcfg_ptype)
226 /* TCA_GACT_PROB */
227 sz += nla_total_size(sizeof(struct tc_gact_p));
228#endif
229
230 return sz;
231}
232
233static struct tc_action_ops act_gact_ops = {
234 .kind = "gact",
235 .type = TCA_ACT_GACT,
236 .owner = THIS_MODULE,
237 .act = tcf_gact,
238 .stats_update = tcf_gact_stats_update,
239 .dump = tcf_gact_dump,
240 .init = tcf_gact_init,
241 .walk = tcf_gact_walker,
242 .lookup = tcf_gact_search,
243 .get_fill_size = tcf_gact_get_fill_size,
244 .size = sizeof(struct tcf_gact),
245};
246
247static __net_init int gact_init_net(struct net *net)
248{
249 struct tc_action_net *tn = net_generic(net, gact_net_id);
250
251 return tc_action_net_init(tn, &act_gact_ops);
252}
253
254static void __net_exit gact_exit_net(struct list_head *net_list)
255{
256 tc_action_net_exit(net_list, gact_net_id);
257}
258
259static struct pernet_operations gact_net_ops = {
260 .init = gact_init_net,
261 .exit_batch = gact_exit_net,
262 .id = &gact_net_id,
263 .size = sizeof(struct tc_action_net),
264};
265
266MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
267MODULE_DESCRIPTION("Generic Classifier actions");
268MODULE_LICENSE("GPL");
269
270static int __init gact_init_module(void)
271{
272#ifdef CONFIG_GACT_PROB
273 pr_info("GACT probability on\n");
274#else
275 pr_info("GACT probability NOT on\n");
276#endif
277
278 return tcf_register_action(&act_gact_ops, &gact_net_ops);
279}
280
281static void __exit gact_cleanup_module(void)
282{
283 tcf_unregister_action(&act_gact_ops, &gact_net_ops);
284}
285
286module_init(gact_init_module);
287module_exit(gact_cleanup_module);