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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
22#define TCA_ACT_SIMP 22
23
24#include <linux/tc_act/tc_defact.h>
25#include <net/tc_act/tc_defact.h>
26
27#define SIMP_TAB_MASK 7
28static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
29static u32 simp_idx_gen;
30static DEFINE_RWLOCK(simp_lock);
31
32static struct tcf_hashinfo simp_hash_info = {
33 .htab = tcf_simp_ht,
34 .hmask = SIMP_TAB_MASK,
35 .lock = &simp_lock,
36};
37
38#define SIMP_MAX_DATA 32
39static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
40 struct tcf_result *res)
41{
42 struct tcf_defact *d = a->priv;
43
44 spin_lock(&d->tcf_lock);
45 d->tcf_tm.lastuse = jiffies;
46 bstats_update(&d->tcf_bstats, skb);
47
48
49
50
51
52 pr_info("simple: %s_%d\n",
53 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
54 spin_unlock(&d->tcf_lock);
55 return d->tcf_action;
56}
57
58static int tcf_simp_release(struct tcf_defact *d, int bind)
59{
60 int ret = 0;
61 if (d) {
62 if (bind)
63 d->tcf_bindcnt--;
64 d->tcf_refcnt--;
65 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
66 kfree(d->tcfd_defdata);
67 tcf_hash_destroy(&d->common, &simp_hash_info);
68 ret = 1;
69 }
70 }
71 return ret;
72}
73
74static int alloc_defdata(struct tcf_defact *d, char *defdata)
75{
76 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
77 if (unlikely(!d->tcfd_defdata))
78 return -ENOMEM;
79 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
80 return 0;
81}
82
83static void reset_policy(struct tcf_defact *d, char *defdata,
84 struct tc_defact *p)
85{
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);
91}
92
93static 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 },
96};
97
98static int tcf_simp_init(struct net *net, struct nlattr *nla,
99 struct nlattr *est, struct tc_action *a,
100 int ovr, int bind)
101{
102 struct nlattr *tb[TCA_DEF_MAX + 1];
103 struct tc_defact *parm;
104 struct tcf_defact *d;
105 struct tcf_common *pc;
106 char *defdata;
107 int ret = 0, err;
108
109 if (nla == NULL)
110 return -EINVAL;
111
112 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
113 if (err < 0)
114 return err;
115
116 if (tb[TCA_DEF_PARMS] == NULL)
117 return -EINVAL;
118
119 if (tb[TCA_DEF_DATA] == NULL)
120 return -EINVAL;
121
122 parm = nla_data(tb[TCA_DEF_PARMS]);
123 defdata = nla_data(tb[TCA_DEF_DATA]);
124
125 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
126 if (!pc) {
127 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
128 &simp_idx_gen, &simp_hash_info);
129 if (IS_ERR(pc))
130 return PTR_ERR(pc);
131
132 d = to_defact(pc);
133 ret = alloc_defdata(d, defdata);
134 if (ret < 0) {
135 if (est)
136 gen_kill_estimator(&pc->tcfc_bstats,
137 &pc->tcfc_rate_est);
138 kfree_rcu(pc, tcfc_rcu);
139 return ret;
140 }
141 d->tcf_action = parm->action;
142 ret = ACT_P_CREATED;
143 } else {
144 d = to_defact(pc);
145 if (!ovr) {
146 tcf_simp_release(d, bind);
147 return -EEXIST;
148 }
149 reset_policy(d, defdata, parm);
150 }
151
152 if (ret == ACT_P_CREATED)
153 tcf_hash_insert(pc, &simp_hash_info);
154 return ret;
155}
156
157static int tcf_simp_cleanup(struct tc_action *a, int bind)
158{
159 struct tcf_defact *d = a->priv;
160
161 if (d)
162 return tcf_simp_release(d, bind);
163 return 0;
164}
165
166static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
167 int bind, int ref)
168{
169 unsigned char *b = skb_tail_pointer(skb);
170 struct tcf_defact *d = a->priv;
171 struct tc_defact opt = {
172 .index = d->tcf_index,
173 .refcnt = d->tcf_refcnt - ref,
174 .bindcnt = d->tcf_bindcnt - bind,
175 .action = d->tcf_action,
176 };
177 struct tcf_t t;
178
179 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
180 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
181 goto nla_put_failure;
182 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
183 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
184 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
185 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
186 goto nla_put_failure;
187 return skb->len;
188
189nla_put_failure:
190 nlmsg_trim(skb, b);
191 return -1;
192}
193
194static struct tc_action_ops act_simp_ops = {
195 .kind = "simple",
196 .hinfo = &simp_hash_info,
197 .type = TCA_ACT_SIMP,
198 .capab = TCA_CAP_NONE,
199 .owner = THIS_MODULE,
200 .act = tcf_simp,
201 .dump = tcf_simp_dump,
202 .cleanup = tcf_simp_cleanup,
203 .init = tcf_simp_init,
204 .walk = tcf_generic_walker,
205};
206
207MODULE_AUTHOR("Jamal Hadi Salim(2005)");
208MODULE_DESCRIPTION("Simple example action");
209MODULE_LICENSE("GPL");
210
211static int __init simp_init_module(void)
212{
213 int ret = tcf_register_action(&act_simp_ops);
214 if (!ret)
215 pr_info("Simple TC action Loaded\n");
216 return ret;
217}
218
219static void __exit simp_cleanup_module(void)
220{
221 tcf_unregister_action(&act_simp_ops);
222}
223
224module_init(simp_init_module);
225module_exit(simp_cleanup_module);
226
