2 * net/sched/gact.c Generic actions
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.
9 * copyright Jamal Hadi Salim (2002-4)
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>
26 #define GACT_TAB_MASK 15
27 static struct tcf_hashinfo gact_hash_info;
29 #ifdef CONFIG_GACT_PROB
30 static int gact_net_rand(struct tcf_gact *gact)
32 if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
33 return gact->tcf_action;
34 return gact->tcfg_paction;
37 static int gact_determ(struct tcf_gact *gact)
39 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
40 return gact->tcf_action;
41 return gact->tcfg_paction;
44 typedef int (*g_rand)(struct tcf_gact *gact);
45 static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
46 #endif /* CONFIG_GACT_PROB */
48 static 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) },
53 static int tcf_gact_init(struct net *net, struct nlattr *nla,
54 struct nlattr *est, struct tc_action *a,
57 struct nlattr *tb[TCA_GACT_MAX + 1];
59 struct tcf_gact *gact;
60 struct tcf_common *pc;
63 #ifdef CONFIG_GACT_PROB
64 struct tc_gact_p *p_parm = NULL;
70 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
74 if (tb[TCA_GACT_PARMS] == NULL)
76 parm = nla_data(tb[TCA_GACT_PARMS]);
78 #ifndef CONFIG_GACT_PROB
79 if (tb[TCA_GACT_PROB] != NULL)
82 if (tb[TCA_GACT_PROB]) {
83 p_parm = nla_data(tb[TCA_GACT_PROB]);
84 if (p_parm->ptype >= MAX_RAND)
89 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
91 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
92 bind, &gact_hash_info);
97 if (bind)/* dont override defaults */
99 tcf_hash_release(pc, bind, &gact_hash_info);
106 spin_lock_bh(&gact->tcf_lock);
107 gact->tcf_action = parm->action;
108 #ifdef CONFIG_GACT_PROB
110 gact->tcfg_paction = p_parm->paction;
111 gact->tcfg_pval = p_parm->pval;
112 gact->tcfg_ptype = p_parm->ptype;
115 spin_unlock_bh(&gact->tcf_lock);
116 if (ret == ACT_P_CREATED)
117 tcf_hash_insert(pc, &gact_hash_info);
121 static int tcf_gact_cleanup(struct tc_action *a, int bind)
123 struct tcf_gact *gact = a->priv;
126 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
130 static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
131 struct tcf_result *res)
133 struct tcf_gact *gact = a->priv;
134 int action = TC_ACT_SHOT;
136 spin_lock(&gact->tcf_lock);
137 #ifdef CONFIG_GACT_PROB
138 if (gact->tcfg_ptype)
139 action = gact_rand[gact->tcfg_ptype](gact);
141 action = gact->tcf_action;
143 action = gact->tcf_action;
145 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
146 gact->tcf_bstats.packets++;
147 if (action == TC_ACT_SHOT)
148 gact->tcf_qstats.drops++;
149 gact->tcf_tm.lastuse = jiffies;
150 spin_unlock(&gact->tcf_lock);
155 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
157 unsigned char *b = skb_tail_pointer(skb);
158 struct tcf_gact *gact = a->priv;
159 struct tc_gact opt = {
160 .index = gact->tcf_index,
161 .refcnt = gact->tcf_refcnt - ref,
162 .bindcnt = gact->tcf_bindcnt - bind,
163 .action = gact->tcf_action,
167 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
168 goto nla_put_failure;
169 #ifdef CONFIG_GACT_PROB
170 if (gact->tcfg_ptype) {
171 struct tc_gact_p p_opt = {
172 .paction = gact->tcfg_paction,
173 .pval = gact->tcfg_pval,
174 .ptype = gact->tcfg_ptype,
177 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
178 goto nla_put_failure;
181 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
182 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
183 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
184 if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
185 goto nla_put_failure;
193 static struct tc_action_ops act_gact_ops = {
195 .hinfo = &gact_hash_info,
196 .type = TCA_ACT_GACT,
197 .capab = TCA_CAP_NONE,
198 .owner = THIS_MODULE,
200 .dump = tcf_gact_dump,
201 .cleanup = tcf_gact_cleanup,
202 .init = tcf_gact_init,
205 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
206 MODULE_DESCRIPTION("Generic Classifier actions");
207 MODULE_LICENSE("GPL");
209 static int __init gact_init_module(void)
211 int err = tcf_hashinfo_init(&gact_hash_info, GACT_TAB_MASK);
214 #ifdef CONFIG_GACT_PROB
215 pr_info("GACT probability on\n");
217 pr_info("GACT probability NOT on\n");
219 return tcf_register_action(&act_gact_ops);
222 static void __exit gact_cleanup_module(void)
224 tcf_unregister_action(&act_gact_ops);
225 tcf_hashinfo_destroy(&gact_hash_info);
228 module_init(gact_init_module);
229 module_exit(gact_cleanup_module);