2 * net/sched/simp.c Simple example of an action
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 * Authors: Jamal Hadi Salim (2005-8)
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/skbuff.h>
18 #include <linux/rtnetlink.h>
19 #include <net/netlink.h>
20 #include <net/pkt_sched.h>
22 #define TCA_ACT_SIMP 22
24 #include <linux/tc_act/tc_defact.h>
25 #include <net/tc_act/tc_defact.h>
27 #define SIMP_TAB_MASK 7
28 static u32 simp_idx_gen;
29 static struct tcf_hashinfo simp_hash_info;
31 #define SIMP_MAX_DATA 32
32 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
33 struct tcf_result *res)
35 struct tcf_defact *d = a->priv;
37 spin_lock(&d->tcf_lock);
38 d->tcf_tm.lastuse = jiffies;
39 bstats_update(&d->tcf_bstats, skb);
41 /* print policy string followed by _ then packet count
42 * Example if this was the 3rd packet and the string was "hello"
43 * then it would look like "hello_3" (without quotes)
45 pr_info("simple: %s_%d\n",
46 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
47 spin_unlock(&d->tcf_lock);
51 static int tcf_simp_release(struct tcf_defact *d, int bind)
58 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
59 kfree(d->tcfd_defdata);
60 tcf_hash_destroy(&d->common, &simp_hash_info);
67 static int alloc_defdata(struct tcf_defact *d, char *defdata)
69 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
70 if (unlikely(!d->tcfd_defdata))
72 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
76 static void reset_policy(struct tcf_defact *d, char *defdata,
79 spin_lock_bh(&d->tcf_lock);
80 d->tcf_action = p->action;
81 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
82 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
83 spin_unlock_bh(&d->tcf_lock);
86 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
87 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
88 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
91 static int tcf_simp_init(struct net *net, struct nlattr *nla,
92 struct nlattr *est, struct tc_action *a,
95 struct nlattr *tb[TCA_DEF_MAX + 1];
96 struct tc_defact *parm;
98 struct tcf_common *pc;
105 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
109 if (tb[TCA_DEF_PARMS] == NULL)
112 if (tb[TCA_DEF_DATA] == NULL)
115 parm = nla_data(tb[TCA_DEF_PARMS]);
116 defdata = nla_data(tb[TCA_DEF_DATA]);
118 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
120 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
121 &simp_idx_gen, &simp_hash_info);
126 ret = alloc_defdata(d, defdata);
129 gen_kill_estimator(&pc->tcfc_bstats,
131 kfree_rcu(pc, tcfc_rcu);
134 d->tcf_action = parm->action;
141 tcf_simp_release(d, bind);
145 reset_policy(d, defdata, parm);
148 if (ret == ACT_P_CREATED)
149 tcf_hash_insert(pc, &simp_hash_info);
153 static int tcf_simp_cleanup(struct tc_action *a, int bind)
155 struct tcf_defact *d = a->priv;
158 return tcf_simp_release(d, bind);
162 static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
165 unsigned char *b = skb_tail_pointer(skb);
166 struct tcf_defact *d = a->priv;
167 struct tc_defact opt = {
168 .index = d->tcf_index,
169 .refcnt = d->tcf_refcnt - ref,
170 .bindcnt = d->tcf_bindcnt - bind,
171 .action = d->tcf_action,
175 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
176 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
177 goto nla_put_failure;
178 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
179 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
180 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
181 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
182 goto nla_put_failure;
190 static struct tc_action_ops act_simp_ops = {
192 .hinfo = &simp_hash_info,
193 .type = TCA_ACT_SIMP,
194 .capab = TCA_CAP_NONE,
195 .owner = THIS_MODULE,
197 .dump = tcf_simp_dump,
198 .cleanup = tcf_simp_cleanup,
199 .init = tcf_simp_init,
202 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
203 MODULE_DESCRIPTION("Simple example action");
204 MODULE_LICENSE("GPL");
206 static int __init simp_init_module(void)
209 err = tcf_hashinfo_init(&simp_hash_info, SIMP_TAB_MASK);
213 ret = tcf_register_action(&act_simp_ops);
215 pr_info("Simple TC action Loaded\n");
217 tcf_hashinfo_destroy(&simp_hash_info);
222 static void __exit simp_cleanup_module(void)
224 tcf_hashinfo_destroy(&simp_hash_info);
225 tcf_unregister_action(&act_simp_ops);
228 module_init(simp_init_module);
229 module_exit(simp_cleanup_module);