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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 d->tcf_bstats.bytes += qdisc_pkt_len(skb);
46 d->tcf_bstats.packets++;
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 kfree(pc);
135 return ret;
136 }
137 d->tcf_action = parm->action;
138 ret = ACT_P_CREATED;
139 } else {
140 d = to_defact(pc);
141 if (!ovr) {
142 tcf_simp_release(d, bind);
143 return -EEXIST;
144 }
145 reset_policy(d, defdata, parm);
146 }
147
148 if (ret == ACT_P_CREATED)
149 tcf_hash_insert(pc, &simp_hash_info);
150 return ret;
151}
152
153static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
154{
155 struct tcf_defact *d = a->priv;
156
157 if (d)
158 return tcf_simp_release(d, bind);
159 return 0;
160}
161
162static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
163 int bind, int ref)
164{
165 unsigned char *b = skb_tail_pointer(skb);
166 struct tcf_defact *d = a->priv;
167 struct tc_defact opt = {
168 .index = d->tcf_index,
169 .refcnt = d->tcf_refcnt - ref,
170 .bindcnt = d->tcf_bindcnt - bind,
171 .action = d->tcf_action,
172 };
173 struct tcf_t t;
174
175 NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
176 NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
177 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
178 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
179 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
180 NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
181 return skb->len;
182
183nla_put_failure:
184 nlmsg_trim(skb, b);
185 return -1;
186}
187
188static struct tc_action_ops act_simp_ops = {
189 .kind = "simple",
190 .hinfo = &simp_hash_info,
191 .type = TCA_ACT_SIMP,
192 .capab = TCA_CAP_NONE,
193 .owner = THIS_MODULE,
194 .act = tcf_simp,
195 .dump = tcf_simp_dump,
196 .cleanup = tcf_simp_cleanup,
197 .init = tcf_simp_init,
198 .walk = tcf_generic_walker,
199};
200
201MODULE_AUTHOR("Jamal Hadi Salim(2005)");
202MODULE_DESCRIPTION("Simple example action");
203MODULE_LICENSE("GPL");
204
205static int __init simp_init_module(void)
206{
207 int ret = tcf_register_action(&act_simp_ops);
208 if (!ret)
209 pr_info("Simple TC action Loaded\n");
210 return ret;
211}
212
213static void __exit simp_cleanup_module(void)
214{
215 tcf_unregister_action(&act_simp_ops);
216}
217
218module_init(simp_init_module);
219module_exit(simp_cleanup_module);
220
