Loading...
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);
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);