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>
21 #include <net/pkt_cls.h>
23 #include <linux/tc_act/tc_defact.h>
24 #include <net/tc_act/tc_defact.h>
26 static unsigned int simp_net_id;
27 static struct tc_action_ops act_simp_ops;
29 #define SIMP_MAX_DATA 32
30 static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a,
31 struct tcf_result *res)
33 struct tcf_defact *d = to_defact(a);
35 spin_lock(&d->tcf_lock);
36 tcf_lastuse_update(&d->tcf_tm);
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)
51 struct tcf_defact *d = to_defact(a);
52 kfree(d->tcfd_defdata);
55 static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
57 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
58 if (unlikely(!d->tcfd_defdata))
60 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
64 static int reset_policy(struct tc_action *a, const struct nlattr *defdata,
65 struct tc_defact *p, struct tcf_proto *tp,
66 struct netlink_ext_ack *extack)
68 struct tcf_chain *goto_ch = NULL;
72 err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack);
76 spin_lock_bh(&d->tcf_lock);
77 goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch);
78 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
79 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
80 spin_unlock_bh(&d->tcf_lock);
82 tcf_chain_put_by_act(goto_ch);
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,
93 int ovr, int bind, bool rtnl_held,
94 struct tcf_proto *tp, struct netlink_ext_ack *extack)
96 struct tc_action_net *tn = net_generic(net, simp_net_id);
97 struct nlattr *tb[TCA_DEF_MAX + 1];
98 struct tcf_chain *goto_ch = NULL;
99 struct tc_defact *parm;
100 struct tcf_defact *d;
107 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL);
111 if (tb[TCA_DEF_PARMS] == NULL)
114 parm = nla_data(tb[TCA_DEF_PARMS]);
115 err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
122 if (tb[TCA_DEF_DATA] == NULL) {
124 tcf_idr_release(*a, bind);
126 tcf_idr_cleanup(tn, parm->index);
131 ret = tcf_idr_create(tn, parm->index, est, a,
132 &act_simp_ops, bind, false);
134 tcf_idr_cleanup(tn, parm->index);
139 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
144 err = alloc_defdata(d, tb[TCA_DEF_DATA]);
148 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
156 err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack);
161 if (ret == ACT_P_CREATED)
162 tcf_idr_insert(tn, *a);
166 tcf_chain_put_by_act(goto_ch);
168 tcf_idr_release(*a, bind);
172 static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
175 unsigned char *b = skb_tail_pointer(skb);
176 struct tcf_defact *d = to_defact(a);
177 struct tc_defact opt = {
178 .index = d->tcf_index,
179 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
180 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
184 spin_lock_bh(&d->tcf_lock);
185 opt.action = d->tcf_action;
186 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
187 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
188 goto nla_put_failure;
190 tcf_tm_dump(&t, &d->tcf_tm);
191 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
192 goto nla_put_failure;
193 spin_unlock_bh(&d->tcf_lock);
198 spin_unlock_bh(&d->tcf_lock);
203 static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
204 struct netlink_callback *cb, int type,
205 const struct tc_action_ops *ops,
206 struct netlink_ext_ack *extack)
208 struct tc_action_net *tn = net_generic(net, simp_net_id);
210 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
213 static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
215 struct tc_action_net *tn = net_generic(net, simp_net_id);
217 return tcf_idr_search(tn, a, index);
220 static struct tc_action_ops act_simp_ops = {
223 .owner = THIS_MODULE,
225 .dump = tcf_simp_dump,
226 .cleanup = tcf_simp_release,
227 .init = tcf_simp_init,
228 .walk = tcf_simp_walker,
229 .lookup = tcf_simp_search,
230 .size = sizeof(struct tcf_defact),
233 static __net_init int simp_init_net(struct net *net)
235 struct tc_action_net *tn = net_generic(net, simp_net_id);
237 return tc_action_net_init(tn, &act_simp_ops);
240 static void __net_exit simp_exit_net(struct list_head *net_list)
242 tc_action_net_exit(net_list, simp_net_id);
245 static struct pernet_operations simp_net_ops = {
246 .init = simp_init_net,
247 .exit_batch = simp_exit_net,
249 .size = sizeof(struct tc_action_net),
252 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
253 MODULE_DESCRIPTION("Simple example action");
254 MODULE_LICENSE("GPL");
256 static int __init simp_init_module(void)
258 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
260 pr_info("Simple TC action Loaded\n");
264 static void __exit simp_cleanup_module(void)
266 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
269 module_init(simp_init_module);
270 module_exit(simp_cleanup_module);