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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, struct tc_action *a, struct tcf_result *res)
40{
41 struct tcf_defact *d = a->priv;
42
43 spin_lock(&d->tcf_lock);
44 d->tcf_tm.lastuse = jiffies;
45 bstats_update(&d->tcf_bstats, skb);
46
47
48
49
50
51 pr_info("simple: %s_%d\n",
52 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
53 spin_unlock(&d->tcf_lock);
54 return d->tcf_action;
55}
56
57static int tcf_simp_release(struct tcf_defact *d, int bind)
58{
59 int ret = 0;
60 if (d) {
61 if (bind)
62 d->tcf_bindcnt--;
63 d->tcf_refcnt--;
64 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
65 kfree(d->tcfd_defdata);
66 tcf_hash_destroy(&d->common, &simp_hash_info);
67 ret = 1;
68 }
69 }
70 return ret;
71}
72
73static int alloc_defdata(struct tcf_defact *d, char *defdata)
74{
75 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
76 if (unlikely(!d->tcfd_defdata))
77 return -ENOMEM;
78 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
79 return 0;
80}
81
82static void reset_policy(struct tcf_defact *d, char *defdata,
83 struct tc_defact *p)
84{
85 spin_lock_bh(&d->tcf_lock);
86 d->tcf_action = p->action;
87 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
88 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
89 spin_unlock_bh(&d->tcf_lock);
90}
91
92static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
93 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
94 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
95};
96
97static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
98 struct tc_action *a, int ovr, int bind)
99{
100 struct nlattr *tb[TCA_DEF_MAX + 1];
101 struct tc_defact *parm;
102 struct tcf_defact *d;
103 struct tcf_common *pc;
104 char *defdata;
105 int ret = 0, err;
106
107 if (nla == NULL)
108 return -EINVAL;
109
110 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
111 if (err < 0)
112 return err;
113
114 if (tb[TCA_DEF_PARMS] == NULL)
115 return -EINVAL;
116
117 if (tb[TCA_DEF_DATA] == NULL)
118 return -EINVAL;
119
120 parm = nla_data(tb[TCA_DEF_PARMS]);
121 defdata = nla_data(tb[TCA_DEF_DATA]);
122
123 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
124 if (!pc) {
125 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
126 &simp_idx_gen, &simp_hash_info);
127 if (IS_ERR(pc))
128 return PTR_ERR(pc);
129
130 d = to_defact(pc);
131 ret = alloc_defdata(d, defdata);
132 if (ret < 0) {
133 kfree(pc);
134 return ret;
135 }
136 d->tcf_action = parm->action;
137 ret = ACT_P_CREATED;
138 } else {
139 d = to_defact(pc);
140 if (!ovr) {
141 tcf_simp_release(d, bind);
142 return -EEXIST;
143 }
144 reset_policy(d, defdata, parm);
145 }
146
147 if (ret == ACT_P_CREATED)
148 tcf_hash_insert(pc, &simp_hash_info);
149 return ret;
150}
151
152static int tcf_simp_cleanup(struct tc_action *a, int bind)
153{
154 struct tcf_defact *d = a->priv;
155
156 if (d)
157 return tcf_simp_release(d, bind);
158 return 0;
159}
160
161static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
162 int bind, int ref)
163{
164 unsigned char *b = skb_tail_pointer(skb);
165 struct tcf_defact *d = a->priv;
166 struct tc_defact opt = {
167 .index = d->tcf_index,
168 .refcnt = d->tcf_refcnt - ref,
169 .bindcnt = d->tcf_bindcnt - bind,
170 .action = d->tcf_action,
171 };
172 struct tcf_t t;
173
174 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
175 NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
176 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
177 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
178 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
179 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
180 return skb->len;
181
182nla_put_failure:
183 nlmsg_trim(skb, b);
184 return -1;
185}
186
187static struct tc_action_ops act_simp_ops = {
188 .kind = "simple",
189 .hinfo = &simp_hash_info,
190 .type = TCA_ACT_SIMP,
191 .capab = TCA_CAP_NONE,
192 .owner = THIS_MODULE,
193 .act = tcf_simp,
194 .dump = tcf_simp_dump,
195 .cleanup = tcf_simp_cleanup,
196 .init = tcf_simp_init,
197 .walk = tcf_generic_walker,
198};
199
200MODULE_AUTHOR("Jamal Hadi Salim(2005)");
201MODULE_DESCRIPTION("Simple example action");
202MODULE_LICENSE("GPL");
203
204static int __init simp_init_module(void)
205{
206 int ret = tcf_register_action(&act_simp_ops);
207 if (!ret)
208 pr_info("Simple TC action Loaded\n");
209 return ret;
210}
211
212static void __exit simp_cleanup_module(void)
213{
214 tcf_unregister_action(&act_simp_ops);
215}
216
217module_init(simp_init_module);
218module_exit(simp_cleanup_module);
219
