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 static int simp_net_id;
30 static struct tc_action_ops act_simp_ops;
32 #define SIMP_MAX_DATA 32
33 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
36 struct tcf_defact *d = to_defact(a);
38 spin_lock(&d->tcf_lock);
39 tcf_lastuse_update(&d->tcf_tm);
40 bstats_update(&d->tcf_bstats, skb);
42 /* print policy string followed by _ then packet count
43 * Example if this was the 3rd packet and the string was "hello"
44 * then it would look like "hello_3" (without quotes)
46 pr_info("simple: %s_%d\n",
47 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
48 spin_unlock(&d->tcf_lock);
52 static void tcf_simp_release(struct tc_action *a, int bind)
54 struct tcf_defact *d = to_defact(a);
55 kfree(d->tcfd_defdata);
58 static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
60 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
61 if (unlikely(!d->tcfd_defdata))
63 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
67 static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata,
70 spin_lock_bh(&d->tcf_lock);
71 d->tcf_action = p->action;
72 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
73 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
74 spin_unlock_bh(&d->tcf_lock);
77 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
78 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
79 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
82 static int tcf_simp_init(struct net *net, struct nlattr *nla,
83 struct nlattr *est, struct tc_action **a,
86 struct tc_action_net *tn = net_generic(net, simp_net_id);
87 struct nlattr *tb[TCA_DEF_MAX + 1];
88 struct tc_defact *parm;
96 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
100 if (tb[TCA_DEF_PARMS] == NULL)
103 parm = nla_data(tb[TCA_DEF_PARMS]);
104 exists = tcf_hash_check(tn, parm->index, a, bind);
108 if (tb[TCA_DEF_DATA] == NULL) {
110 tcf_hash_release(*a, bind);
115 ret = tcf_hash_create(tn, parm->index, est, a,
116 &act_simp_ops, bind, false);
121 ret = alloc_defdata(d, tb[TCA_DEF_DATA]);
123 tcf_hash_cleanup(*a, est);
126 d->tcf_action = parm->action;
131 tcf_hash_release(*a, bind);
135 reset_policy(d, tb[TCA_DEF_DATA], parm);
138 if (ret == ACT_P_CREATED)
139 tcf_hash_insert(tn, *a);
143 static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
146 unsigned char *b = skb_tail_pointer(skb);
147 struct tcf_defact *d = to_defact(a);
148 struct tc_defact opt = {
149 .index = d->tcf_index,
150 .refcnt = d->tcf_refcnt - ref,
151 .bindcnt = d->tcf_bindcnt - bind,
152 .action = d->tcf_action,
156 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
157 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
158 goto nla_put_failure;
160 tcf_tm_dump(&t, &d->tcf_tm);
161 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
162 goto nla_put_failure;
170 static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
171 struct netlink_callback *cb, int type,
172 const struct tc_action_ops *ops)
174 struct tc_action_net *tn = net_generic(net, simp_net_id);
176 return tcf_generic_walker(tn, skb, cb, type, ops);
179 static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
181 struct tc_action_net *tn = net_generic(net, simp_net_id);
183 return tcf_hash_search(tn, a, index);
186 static struct tc_action_ops act_simp_ops = {
188 .type = TCA_ACT_SIMP,
189 .owner = THIS_MODULE,
191 .dump = tcf_simp_dump,
192 .cleanup = tcf_simp_release,
193 .init = tcf_simp_init,
194 .walk = tcf_simp_walker,
195 .lookup = tcf_simp_search,
196 .size = sizeof(struct tcf_defact),
199 static __net_init int simp_init_net(struct net *net)
201 struct tc_action_net *tn = net_generic(net, simp_net_id);
203 return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
206 static void __net_exit simp_exit_net(struct net *net)
208 struct tc_action_net *tn = net_generic(net, simp_net_id);
210 tc_action_net_exit(tn);
213 static struct pernet_operations simp_net_ops = {
214 .init = simp_init_net,
215 .exit = simp_exit_net,
217 .size = sizeof(struct tc_action_net),
220 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
221 MODULE_DESCRIPTION("Simple example action");
222 MODULE_LICENSE("GPL");
224 static int __init simp_init_module(void)
226 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
228 pr_info("Simple TC action Loaded\n");
232 static void __exit simp_cleanup_module(void)
234 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
237 module_init(simp_init_module);
238 module_exit(simp_cleanup_module);