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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 nlattr *nla, struct nlattr *est,
99 struct tc_action *a, int ovr, int bind)
100{
101 struct nlattr *tb[TCA_DEF_MAX + 1];
102 struct tc_defact *parm;
103 struct tcf_defact *d;
104 struct tcf_common *pc;
105 char *defdata;
106 int ret = 0, err;
107
108 if (nla == NULL)
109 return -EINVAL;
110
111 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
112 if (err < 0)
113 return err;
114
115 if (tb[TCA_DEF_PARMS] == NULL)
116 return -EINVAL;
117
118 if (tb[TCA_DEF_DATA] == NULL)
119 return -EINVAL;
120
121 parm = nla_data(tb[TCA_DEF_PARMS]);
122 defdata = nla_data(tb[TCA_DEF_DATA]);
123
124 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
125 if (!pc) {
126 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
127 &simp_idx_gen, &simp_hash_info);
128 if (IS_ERR(pc))
129 return PTR_ERR(pc);
130
131 d = to_defact(pc);
132 ret = alloc_defdata(d, defdata);
133 if (ret < 0) {
134 if (est)
135 gen_kill_estimator(&pc->tcfc_bstats,
136 &pc->tcfc_rate_est);
137 kfree_rcu(pc, tcfc_rcu);
138 return ret;
139 }
140 d->tcf_action = parm->action;
141 ret = ACT_P_CREATED;
142 } else {
143 d = to_defact(pc);
144 if (!ovr) {
145 tcf_simp_release(d, bind);
146 return -EEXIST;
147 }
148 reset_policy(d, defdata, parm);
149 }
150
151 if (ret == ACT_P_CREATED)
152 tcf_hash_insert(pc, &simp_hash_info);
153 return ret;
154}
155
156static int tcf_simp_cleanup(struct tc_action *a, int bind)
157{
158 struct tcf_defact *d = a->priv;
159
160 if (d)
161 return tcf_simp_release(d, bind);
162 return 0;
163}
164
165static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
166 int bind, int ref)
167{
168 unsigned char *b = skb_tail_pointer(skb);
169 struct tcf_defact *d = a->priv;
170 struct tc_defact opt = {
171 .index = d->tcf_index,
172 .refcnt = d->tcf_refcnt - ref,
173 .bindcnt = d->tcf_bindcnt - bind,
174 .action = d->tcf_action,
175 };
176 struct tcf_t t;
177
178 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
179 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
180 goto nla_put_failure;
181 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
182 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
183 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
184 if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
185 goto nla_put_failure;
186 return skb->len;
187
188nla_put_failure:
189 nlmsg_trim(skb, b);
190 return -1;
191}
192
193static struct tc_action_ops act_simp_ops = {
194 .kind = "simple",
195 .hinfo = &simp_hash_info,
196 .type = TCA_ACT_SIMP,
197 .capab = TCA_CAP_NONE,
198 .owner = THIS_MODULE,
199 .act = tcf_simp,
200 .dump = tcf_simp_dump,
201 .cleanup = tcf_simp_cleanup,
202 .init = tcf_simp_init,
203 .walk = tcf_generic_walker,
204};
205
206MODULE_AUTHOR("Jamal Hadi Salim(2005)");
207MODULE_DESCRIPTION("Simple example action");
208MODULE_LICENSE("GPL");
209
210static int __init simp_init_module(void)
211{
212 int ret = tcf_register_action(&act_simp_ops);
213 if (!ret)
214 pr_info("Simple TC action Loaded\n");
215 return ret;
216}
217
218static void __exit simp_cleanup_module(void)
219{
220 tcf_unregister_action(&act_simp_ops);
221}
222
223module_init(simp_init_module);
224module_exit(simp_cleanup_module);
225
