2 * net/sched/act_simple.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
29 #define SIMP_MAX_DATA 32
30 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
31 struct tcf_result *res)
33 struct tcf_defact *d = a->priv;
35 spin_lock(&d->tcf_lock);
36 d->tcf_tm.lastuse = jiffies;
37 bstats_update(&d->tcf_bstats, skb);
39 /* print policy string followed by _ then packet count
40 * Example if this was the 3rd packet and the string was "hello"
41 * then it would look like "hello_3" (without quotes)
43 pr_info("simple: %s_%d\n",
44 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
45 spin_unlock(&d->tcf_lock);
49 static void tcf_simp_release(struct tc_action *a, int bind)
51 struct tcf_defact *d = to_defact(a);
52 kfree(d->tcfd_defdata);
55 static int alloc_defdata(struct tcf_defact *d, char *defdata)
57 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
58 if (unlikely(!d->tcfd_defdata))
60 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
64 static void reset_policy(struct tcf_defact *d, char *defdata,
67 spin_lock_bh(&d->tcf_lock);
68 d->tcf_action = p->action;
69 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
70 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
71 spin_unlock_bh(&d->tcf_lock);
74 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
75 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
76 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
79 static int tcf_simp_init(struct net *net, struct nlattr *nla,
80 struct nlattr *est, struct tc_action *a,
83 struct nlattr *tb[TCA_DEF_MAX + 1];
84 struct tc_defact *parm;
92 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
96 if (tb[TCA_DEF_PARMS] == NULL)
99 if (tb[TCA_DEF_DATA] == NULL)
102 parm = nla_data(tb[TCA_DEF_PARMS]);
103 defdata = nla_data(tb[TCA_DEF_DATA]);
105 if (!tcf_hash_check(parm->index, a, bind)) {
106 ret = tcf_hash_create(parm->index, est, a, sizeof(*d),
112 ret = alloc_defdata(d, defdata);
114 tcf_hash_cleanup(a, est);
117 d->tcf_action = parm->action;
124 tcf_hash_release(a, bind);
128 reset_policy(d, defdata, parm);
131 if (ret == ACT_P_CREATED)
136 static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
139 unsigned char *b = skb_tail_pointer(skb);
140 struct tcf_defact *d = a->priv;
141 struct tc_defact opt = {
142 .index = d->tcf_index,
143 .refcnt = d->tcf_refcnt - ref,
144 .bindcnt = d->tcf_bindcnt - bind,
145 .action = d->tcf_action,
149 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
150 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
151 goto nla_put_failure;
152 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
153 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
154 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
155 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
156 goto nla_put_failure;
164 static struct tc_action_ops act_simp_ops = {
166 .type = TCA_ACT_SIMP,
167 .owner = THIS_MODULE,
169 .dump = tcf_simp_dump,
170 .cleanup = tcf_simp_release,
171 .init = tcf_simp_init,
174 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
175 MODULE_DESCRIPTION("Simple example action");
176 MODULE_LICENSE("GPL");
178 static int __init simp_init_module(void)
181 ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK);
183 pr_info("Simple TC action Loaded\n");
187 static void __exit simp_cleanup_module(void)
189 tcf_unregister_action(&act_simp_ops);
192 module_init(simp_init_module);
193 module_exit(simp_cleanup_module);