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1/*
2 * net/sched/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
28#ifdef CONFIG_GACT_PROB
29static int gact_net_rand(struct tcf_gact *gact)
30{
31 if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval)
32 return gact->tcf_action;
33 return gact->tcfg_paction;
34}
35
36static int gact_determ(struct tcf_gact *gact)
37{
38 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
39 return gact->tcf_action;
40 return gact->tcfg_paction;
41}
42
43typedef int (*g_rand)(struct tcf_gact *gact);
44static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
45#endif /* CONFIG_GACT_PROB */
46
47static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
48 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
49 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
50};
51
52static int tcf_gact_init(struct net *net, struct nlattr *nla,
53 struct nlattr *est, struct tc_action *a,
54 int ovr, int bind)
55{
56 struct nlattr *tb[TCA_GACT_MAX + 1];
57 struct tc_gact *parm;
58 struct tcf_gact *gact;
59 int ret = 0;
60 int err;
61#ifdef CONFIG_GACT_PROB
62 struct tc_gact_p *p_parm = NULL;
63#endif
64
65 if (nla == NULL)
66 return -EINVAL;
67
68 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
69 if (err < 0)
70 return err;
71
72 if (tb[TCA_GACT_PARMS] == NULL)
73 return -EINVAL;
74 parm = nla_data(tb[TCA_GACT_PARMS]);
75
76#ifndef CONFIG_GACT_PROB
77 if (tb[TCA_GACT_PROB] != NULL)
78 return -EOPNOTSUPP;
79#else
80 if (tb[TCA_GACT_PROB]) {
81 p_parm = nla_data(tb[TCA_GACT_PROB]);
82 if (p_parm->ptype >= MAX_RAND)
83 return -EINVAL;
84 }
85#endif
86
87 if (!tcf_hash_check(parm->index, a, bind)) {
88 ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind);
89 if (ret)
90 return ret;
91 ret = ACT_P_CREATED;
92 } else {
93 if (bind)/* dont override defaults */
94 return 0;
95 tcf_hash_release(a, bind);
96 if (!ovr)
97 return -EEXIST;
98 }
99
100 gact = to_gact(a);
101
102 spin_lock_bh(&gact->tcf_lock);
103 gact->tcf_action = parm->action;
104#ifdef CONFIG_GACT_PROB
105 if (p_parm) {
106 gact->tcfg_paction = p_parm->paction;
107 gact->tcfg_pval = p_parm->pval;
108 gact->tcfg_ptype = p_parm->ptype;
109 }
110#endif
111 spin_unlock_bh(&gact->tcf_lock);
112 if (ret == ACT_P_CREATED)
113 tcf_hash_insert(a);
114 return ret;
115}
116
117static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
118 struct tcf_result *res)
119{
120 struct tcf_gact *gact = a->priv;
121 int action = TC_ACT_SHOT;
122
123 spin_lock(&gact->tcf_lock);
124#ifdef CONFIG_GACT_PROB
125 if (gact->tcfg_ptype)
126 action = gact_rand[gact->tcfg_ptype](gact);
127 else
128 action = gact->tcf_action;
129#else
130 action = gact->tcf_action;
131#endif
132 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
133 gact->tcf_bstats.packets++;
134 if (action == TC_ACT_SHOT)
135 gact->tcf_qstats.drops++;
136 gact->tcf_tm.lastuse = jiffies;
137 spin_unlock(&gact->tcf_lock);
138
139 return action;
140}
141
142static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
143{
144 unsigned char *b = skb_tail_pointer(skb);
145 struct tcf_gact *gact = a->priv;
146 struct tc_gact opt = {
147 .index = gact->tcf_index,
148 .refcnt = gact->tcf_refcnt - ref,
149 .bindcnt = gact->tcf_bindcnt - bind,
150 .action = gact->tcf_action,
151 };
152 struct tcf_t t;
153
154 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
155 goto nla_put_failure;
156#ifdef CONFIG_GACT_PROB
157 if (gact->tcfg_ptype) {
158 struct tc_gact_p p_opt = {
159 .paction = gact->tcfg_paction,
160 .pval = gact->tcfg_pval,
161 .ptype = gact->tcfg_ptype,
162 };
163
164 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
165 goto nla_put_failure;
166 }
167#endif
168 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
169 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
170 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
171 if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
172 goto nla_put_failure;
173 return skb->len;
174
175nla_put_failure:
176 nlmsg_trim(skb, b);
177 return -1;
178}
179
180static struct tc_action_ops act_gact_ops = {
181 .kind = "gact",
182 .type = TCA_ACT_GACT,
183 .owner = THIS_MODULE,
184 .act = tcf_gact,
185 .dump = tcf_gact_dump,
186 .init = tcf_gact_init,
187};
188
189MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
190MODULE_DESCRIPTION("Generic Classifier actions");
191MODULE_LICENSE("GPL");
192
193static int __init gact_init_module(void)
194{
195#ifdef CONFIG_GACT_PROB
196 pr_info("GACT probability on\n");
197#else
198 pr_info("GACT probability NOT on\n");
199#endif
200 return tcf_register_action(&act_gact_ops, GACT_TAB_MASK);
201}
202
203static void __exit gact_cleanup_module(void)
204{
205 tcf_unregister_action(&act_gact_ops);
206}
207
208module_init(gact_init_module);
209module_exit(gact_cleanup_module);
1/*
2 * net/sched/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
27static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
28static u32 gact_idx_gen;
29static DEFINE_RWLOCK(gact_lock);
30
31static struct tcf_hashinfo gact_hash_info = {
32 .htab = tcf_gact_ht,
33 .hmask = GACT_TAB_MASK,
34 .lock = &gact_lock,
35};
36
37#ifdef CONFIG_GACT_PROB
38static int gact_net_rand(struct tcf_gact *gact)
39{
40 if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
41 return gact->tcf_action;
42 return gact->tcfg_paction;
43}
44
45static int gact_determ(struct tcf_gact *gact)
46{
47 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
48 return gact->tcf_action;
49 return gact->tcfg_paction;
50}
51
52typedef int (*g_rand)(struct tcf_gact *gact);
53static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
54#endif /* CONFIG_GACT_PROB */
55
56static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
57 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
58 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
59};
60
61static int tcf_gact_init(struct nlattr *nla, struct nlattr *est,
62 struct tc_action *a, int ovr, int bind)
63{
64 struct nlattr *tb[TCA_GACT_MAX + 1];
65 struct tc_gact *parm;
66 struct tcf_gact *gact;
67 struct tcf_common *pc;
68 int ret = 0;
69 int err;
70
71 if (nla == NULL)
72 return -EINVAL;
73
74 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
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#endif
86
87 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
88 if (!pc) {
89 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
90 bind, &gact_idx_gen, &gact_hash_info);
91 if (IS_ERR(pc))
92 return PTR_ERR(pc);
93 ret = ACT_P_CREATED;
94 } else {
95 if (!ovr) {
96 tcf_hash_release(pc, bind, &gact_hash_info);
97 return -EEXIST;
98 }
99 }
100
101 gact = to_gact(pc);
102
103 spin_lock_bh(&gact->tcf_lock);
104 gact->tcf_action = parm->action;
105#ifdef CONFIG_GACT_PROB
106 if (tb[TCA_GACT_PROB] != NULL) {
107 struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]);
108 gact->tcfg_paction = p_parm->paction;
109 gact->tcfg_pval = p_parm->pval;
110 gact->tcfg_ptype = p_parm->ptype;
111 }
112#endif
113 spin_unlock_bh(&gact->tcf_lock);
114 if (ret == ACT_P_CREATED)
115 tcf_hash_insert(pc, &gact_hash_info);
116 return ret;
117}
118
119static int tcf_gact_cleanup(struct tc_action *a, int bind)
120{
121 struct tcf_gact *gact = a->priv;
122
123 if (gact)
124 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
125 return 0;
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 = TC_ACT_SHOT;
133
134 spin_lock(&gact->tcf_lock);
135#ifdef CONFIG_GACT_PROB
136 if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
137 action = gact_rand[gact->tcfg_ptype](gact);
138 else
139 action = gact->tcf_action;
140#else
141 action = gact->tcf_action;
142#endif
143 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
144 gact->tcf_bstats.packets++;
145 if (action == TC_ACT_SHOT)
146 gact->tcf_qstats.drops++;
147 gact->tcf_tm.lastuse = jiffies;
148 spin_unlock(&gact->tcf_lock);
149
150 return action;
151}
152
153static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
154{
155 unsigned char *b = skb_tail_pointer(skb);
156 struct tcf_gact *gact = a->priv;
157 struct tc_gact opt = {
158 .index = gact->tcf_index,
159 .refcnt = gact->tcf_refcnt - ref,
160 .bindcnt = gact->tcf_bindcnt - bind,
161 .action = gact->tcf_action,
162 };
163 struct tcf_t t;
164
165 NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
166#ifdef CONFIG_GACT_PROB
167 if (gact->tcfg_ptype) {
168 struct tc_gact_p p_opt = {
169 .paction = gact->tcfg_paction,
170 .pval = gact->tcfg_pval,
171 .ptype = gact->tcfg_ptype,
172 };
173
174 NLA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
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 NLA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
181 return skb->len;
182
183nla_put_failure:
184 nlmsg_trim(skb, b);
185 return -1;
186}
187
188static struct tc_action_ops act_gact_ops = {
189 .kind = "gact",
190 .hinfo = &gact_hash_info,
191 .type = TCA_ACT_GACT,
192 .capab = TCA_CAP_NONE,
193 .owner = THIS_MODULE,
194 .act = tcf_gact,
195 .dump = tcf_gact_dump,
196 .cleanup = tcf_gact_cleanup,
197 .lookup = tcf_hash_search,
198 .init = tcf_gact_init,
199 .walk = tcf_generic_walker
200};
201
202MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
203MODULE_DESCRIPTION("Generic Classifier actions");
204MODULE_LICENSE("GPL");
205
206static int __init gact_init_module(void)
207{
208#ifdef CONFIG_GACT_PROB
209 pr_info("GACT probability on\n");
210#else
211 pr_info("GACT probability NOT on\n");
212#endif
213 return tcf_register_action(&act_gact_ops);
214}
215
216static void __exit gact_cleanup_module(void)
217{
218 tcf_unregister_action(&act_gact_ops);
219}
220
221module_init(gact_init_module);
222module_exit(gact_cleanup_module);