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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
28
29static unsigned int simp_net_id;
30static struct tc_action_ops act_simp_ops;
31
32#define SIMP_MAX_DATA 32
33static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
35{
36 struct tcf_defact *d = to_defact(a);
37
38 spin_lock(&d->tcf_lock);
39 tcf_lastuse_update(&d->tcf_tm);
40 bstats_update(&d->tcf_bstats, skb);
41
42
43
44
45
46 pr_info("simple: %s_%d\n",
47 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
48 spin_unlock(&d->tcf_lock);
49 return d->tcf_action;
50}
51
52static void tcf_simp_release(struct tc_action *a, int bind)
53{
54 struct tcf_defact *d = to_defact(a);
55 kfree(d->tcfd_defdata);
56}
57
58static int alloc_defdata(struct tcf_defact *d, char *defdata)
59{
60 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
61 if (unlikely(!d->tcfd_defdata))
62 return -ENOMEM;
63 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
64 return 0;
65}
66
67static void reset_policy(struct tcf_defact *d, char *defdata,
68 struct tc_defact *p)
69{
70 spin_lock_bh(&d->tcf_lock);
71 d->tcf_action = p->action;
72 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
73 strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
74 spin_unlock_bh(&d->tcf_lock);
75}
76
77static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
78 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
79 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
80};
81
82static int tcf_simp_init(struct net *net, struct nlattr *nla,
83 struct nlattr *est, struct tc_action **a,
84 int ovr, int bind)
85{
86 struct tc_action_net *tn = net_generic(net, simp_net_id);
87 struct nlattr *tb[TCA_DEF_MAX + 1];
88 struct tc_defact *parm;
89 struct tcf_defact *d;
90 bool exists = false;
91 int ret = 0, err;
92 char *defdata;
93
94 if (nla == NULL)
95 return -EINVAL;
96
97 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL);
98 if (err < 0)
99 return err;
100
101 if (tb[TCA_DEF_PARMS] == NULL)
102 return -EINVAL;
103
104 parm = nla_data(tb[TCA_DEF_PARMS]);
105 exists = tcf_hash_check(tn, parm->index, a, bind);
106 if (exists && bind)
107 return 0;
108
109 if (tb[TCA_DEF_DATA] == NULL) {
110 if (exists)
111 tcf_hash_release(*a, bind);
112 return -EINVAL;
113 }
114
115 defdata = nla_data(tb[TCA_DEF_DATA]);
116
117 if (!exists) {
118 ret = tcf_hash_create(tn, parm->index, est, a,
119 &act_simp_ops, bind, false);
120 if (ret)
121 return ret;
122
123 d = to_defact(*a);
124 ret = alloc_defdata(d, defdata);
125 if (ret < 0) {
126 tcf_hash_cleanup(*a, est);
127 return ret;
128 }
129 d->tcf_action = parm->action;
130 ret = ACT_P_CREATED;
131 } else {
132 d = to_defact(*a);
133
134 tcf_hash_release(*a, bind);
135 if (!ovr)
136 return -EEXIST;
137
138 reset_policy(d, defdata, parm);
139 }
140
141 if (ret == ACT_P_CREATED)
142 tcf_hash_insert(tn, *a);
143 return ret;
144}
145
146static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
147 int bind, int ref)
148{
149 unsigned char *b = skb_tail_pointer(skb);
150 struct tcf_defact *d = to_defact(a);
151 struct tc_defact opt = {
152 .index = d->tcf_index,
153 .refcnt = d->tcf_refcnt - ref,
154 .bindcnt = d->tcf_bindcnt - bind,
155 .action = d->tcf_action,
156 };
157 struct tcf_t t;
158
159 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
160 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
161 goto nla_put_failure;
162
163 tcf_tm_dump(&t, &d->tcf_tm);
164 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
165 goto nla_put_failure;
166 return skb->len;
167
168nla_put_failure:
169 nlmsg_trim(skb, b);
170 return -1;
171}
172
173static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
174 struct netlink_callback *cb, int type,
175 const struct tc_action_ops *ops)
176{
177 struct tc_action_net *tn = net_generic(net, simp_net_id);
178
179 return tcf_generic_walker(tn, skb, cb, type, ops);
180}
181
182static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
183{
184 struct tc_action_net *tn = net_generic(net, simp_net_id);
185
186 return tcf_hash_search(tn, a, index);
187}
188
189static struct tc_action_ops act_simp_ops = {
190 .kind = "simple",
191 .type = TCA_ACT_SIMP,
192 .owner = THIS_MODULE,
193 .act = tcf_simp,
194 .dump = tcf_simp_dump,
195 .cleanup = tcf_simp_release,
196 .init = tcf_simp_init,
197 .walk = tcf_simp_walker,
198 .lookup = tcf_simp_search,
199 .size = sizeof(struct tcf_defact),
200};
201
202static __net_init int simp_init_net(struct net *net)
203{
204 struct tc_action_net *tn = net_generic(net, simp_net_id);
205
206 return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
207}
208
209static void __net_exit simp_exit_net(struct net *net)
210{
211 struct tc_action_net *tn = net_generic(net, simp_net_id);
212
213 tc_action_net_exit(tn);
214}
215
216static struct pernet_operations simp_net_ops = {
217 .init = simp_init_net,
218 .exit = simp_exit_net,
219 .id = &simp_net_id,
220 .size = sizeof(struct tc_action_net),
221};
222
223MODULE_AUTHOR("Jamal Hadi Salim(2005)");
224MODULE_DESCRIPTION("Simple example action");
225MODULE_LICENSE("GPL");
226
227static int __init simp_init_module(void)
228{
229 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
230 if (!ret)
231 pr_info("Simple TC action Loaded\n");
232 return ret;
233}
234
235static void __exit simp_cleanup_module(void)
236{
237 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
238}
239
240module_init(simp_init_module);
241module_exit(simp_cleanup_module);
242
