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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/rtnetlink.h>
18#include <net/netlink.h>
19#include <net/pkt_sched.h>
20
21#define TCA_ACT_SIMP 22
22
23#include <linux/tc_act/tc_defact.h>
24#include <net/tc_act/tc_defact.h>
25
26#define SIMP_TAB_MASK 7
27static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
28static u32 simp_idx_gen;
29static DEFINE_RWLOCK(simp_lock);
30
31static struct tcf_hashinfo simp_hash_info = {
32 .htab = tcf_simp_ht,
33 .hmask = SIMP_TAB_MASK,
34 .lock = &simp_lock,
35};
36
37static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
38{
39 struct tcf_defact *d = a->priv;
40
41 spin_lock(&d->tcf_lock);
42 d->tcf_tm.lastuse = jiffies;
43 d->tcf_bstats.bytes += skb->len;
44 d->tcf_bstats.packets++;
45
46
47
48
49
50 printk("simple: %s_%d\n",
51 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
52 spin_unlock(&d->tcf_lock);
53 return d->tcf_action;
54}
55
56static int tcf_simp_release(struct tcf_defact *d, int bind)
57{
58 int ret = 0;
59 if (d) {
60 if (bind)
61 d->tcf_bindcnt--;
62 d->tcf_refcnt--;
63 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
64 kfree(d->tcfd_defdata);
65 tcf_hash_destroy(&d->common, &simp_hash_info);
66 ret = 1;
67 }
68 }
69 return ret;
70}
71
72static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
73{
74 d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);
75 if (unlikely(!d->tcfd_defdata))
76 return -ENOMEM;
77 d->tcfd_datalen = datalen;
78 return 0;
79}
80
81static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
82{
83 kfree(d->tcfd_defdata);
84 return alloc_defdata(d, datalen, defdata);
85}
86
87static int tcf_simp_init(struct rtattr *rta, struct rtattr *est,
88 struct tc_action *a, int ovr, int bind)
89{
90 struct rtattr *tb[TCA_DEF_MAX];
91 struct tc_defact *parm;
92 struct tcf_defact *d;
93 struct tcf_common *pc;
94 void *defdata;
95 u32 datalen = 0;
96 int ret = 0;
97
98 if (rta == NULL || rtattr_parse_nested(tb, TCA_DEF_MAX, rta) < 0)
99 return -EINVAL;
100
101 if (tb[TCA_DEF_PARMS - 1] == NULL ||
102 RTA_PAYLOAD(tb[TCA_DEF_PARMS - 1]) < sizeof(*parm))
103 return -EINVAL;
104
105 parm = RTA_DATA(tb[TCA_DEF_PARMS - 1]);
106 defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);
107 if (defdata == NULL)
108 return -EINVAL;
109
110 datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);
111 if (datalen <= 0)
112 return -EINVAL;
113
114 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
115 if (!pc) {
116 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
117 &simp_idx_gen, &simp_hash_info);
118 if (unlikely(!pc))
119 return -ENOMEM;
120
121 d = to_defact(pc);
122 ret = alloc_defdata(d, datalen, defdata);
123 if (ret < 0) {
124 kfree(pc);
125 return ret;
126 }
127 ret = ACT_P_CREATED;
128 } else {
129 d = to_defact(pc);
130 if (!ovr) {
131 tcf_simp_release(d, bind);
132 return -EEXIST;
133 }
134 realloc_defdata(d, datalen, defdata);
135 }
136
137 spin_lock_bh(&d->tcf_lock);
138 d->tcf_action = parm->action;
139 spin_unlock_bh(&d->tcf_lock);
140
141 if (ret == ACT_P_CREATED)
142 tcf_hash_insert(pc, &simp_hash_info);
143 return ret;
144}
145
146static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
147{
148 struct tcf_defact *d = a->priv;
149
150 if (d)
151 return tcf_simp_release(d, bind);
152 return 0;
153}
154
155static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
156 int bind, int ref)
157{
158 unsigned char *b = skb_tail_pointer(skb);
159 struct tcf_defact *d = a->priv;
160 struct tc_defact opt;
161 struct tcf_t t;
162
163 opt.index = d->tcf_index;
164 opt.refcnt = d->tcf_refcnt - ref;
165 opt.bindcnt = d->tcf_bindcnt - bind;
166 opt.action = d->tcf_action;
167 RTA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
168 RTA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
169 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
170 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
171 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
172 RTA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
173 return skb->len;
174
175rtattr_failure:
176 nlmsg_trim(skb, b);
177 return -1;
178}
179
180static struct tc_action_ops act_simp_ops = {
181 .kind = "simple",
182 .hinfo = &simp_hash_info,
183 .type = TCA_ACT_SIMP,
184 .capab = TCA_CAP_NONE,
185 .owner = THIS_MODULE,
186 .act = tcf_simp,
187 .dump = tcf_simp_dump,
188 .cleanup = tcf_simp_cleanup,
189 .init = tcf_simp_init,
190 .walk = tcf_generic_walker,
191};
192
193MODULE_AUTHOR("Jamal Hadi Salim(2005)");
194MODULE_DESCRIPTION("Simple example action");
195MODULE_LICENSE("GPL");
196
197static int __init simp_init_module(void)
198{
199 int ret = tcf_register_action(&act_simp_ops);
200 if (!ret)
201 printk("Simple TC action Loaded\n");
202 return ret;
203}
204
205static void __exit simp_cleanup_module(void)
206{
207 tcf_unregister_action(&act_simp_ops);
208}
209
210module_init(simp_init_module);
211module_exit(simp_cleanup_module);
212
