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 struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
29 static u32 simp_idx_gen;
30 static DEFINE_RWLOCK(simp_lock);
32 static struct tcf_hashinfo simp_hash_info = {
34 .hmask = SIMP_TAB_MASK,
38 #define SIMP_MAX_DATA 32
39 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
40 struct tcf_result *res)
42 struct tcf_defact *d = a->priv;
44 spin_lock(&d->tcf_lock);
45 d->tcf_tm.lastuse = jiffies;
46 bstats_update(&d->tcf_bstats, skb);
48 /* print policy string followed by _ then packet count
49 * Example if this was the 3rd packet and the string was "hello"
50 * then it would look like "hello_3" (without quotes)
52 pr_info("simple: %s_%d\n",
53 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
54 spin_unlock(&d->tcf_lock);
58 static int tcf_simp_release(struct tcf_defact *d, int bind)
65 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
66 kfree(d->tcfd_defdata);
67 tcf_hash_destroy(&d->common, &simp_hash_info);
74 static int alloc_defdata(struct tcf_defact *d, char *defdata)
76 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
77 if (unlikely(!d->tcfd_defdata))
79 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
83 static void reset_policy(struct tcf_defact *d, char *defdata,
86 spin_lock_bh(&d->tcf_lock);
87 d->tcf_action = p->action;
88 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
89 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
90 spin_unlock_bh(&d->tcf_lock);
93 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
94 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
95 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
98 static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
99 struct tc_action *a, int ovr, int bind)
101 struct nlattr *tb[TCA_DEF_MAX + 1];
102 struct tc_defact *parm;
103 struct tcf_defact *d;
104 struct tcf_common *pc;
111 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
115 if (tb[TCA_DEF_PARMS] == NULL)
118 if (tb[TCA_DEF_DATA] == NULL)
121 parm = nla_data(tb[TCA_DEF_PARMS]);
122 defdata = nla_data(tb[TCA_DEF_DATA]);
124 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
126 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
127 &simp_idx_gen, &simp_hash_info);
132 ret = alloc_defdata(d, defdata);
137 d->tcf_action = parm->action;
142 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 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
176 NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
177 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
178 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
179 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
180 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
188 static struct tc_action_ops act_simp_ops = {
190 .hinfo = &simp_hash_info,
191 .type = TCA_ACT_SIMP,
192 .capab = TCA_CAP_NONE,
193 .owner = THIS_MODULE,
195 .dump = tcf_simp_dump,
196 .cleanup = tcf_simp_cleanup,
197 .init = tcf_simp_init,
198 .walk = tcf_generic_walker,
201 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
202 MODULE_DESCRIPTION("Simple example action");
203 MODULE_LICENSE("GPL");
205 static int __init simp_init_module(void)
207 int ret = tcf_register_action(&act_simp_ops);
209 pr_info("Simple TC action Loaded\n");
213 static void __exit simp_cleanup_module(void)
215 tcf_unregister_action(&act_simp_ops);
218 module_init(simp_init_module);
219 module_exit(simp_cleanup_module);