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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
27static int simp_net_id;
28static struct tc_action_ops act_simp_ops;
29
30#define SIMP_MAX_DATA 32
31static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
32 struct tcf_result *res)
33{
34 struct tcf_defact *d = to_defact(a);
35
36 spin_lock(&d->tcf_lock);
37 tcf_lastuse_update(&d->tcf_tm);
38 bstats_update(&d->tcf_bstats, skb);
39
40
41
42
43
44 pr_info("simple: %s_%d\n",
45 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
46 spin_unlock(&d->tcf_lock);
47 return d->tcf_action;
48}
49
50static void tcf_simp_release(struct tc_action *a, int bind)
51{
52 struct tcf_defact *d = to_defact(a);
53 kfree(d->tcfd_defdata);
54}
55
56static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
57{
58 d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
59 if (unlikely(!d->tcfd_defdata))
60 return -ENOMEM;
61 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
62 return 0;
63}
64
65static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata,
66 struct tc_defact *p)
67{
68 spin_lock_bh(&d->tcf_lock);
69 d->tcf_action = p->action;
70 memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
71 nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
72 spin_unlock_bh(&d->tcf_lock);
73}
74
75static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
76 [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
77 [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
78};
79
80static int tcf_simp_init(struct net *net, struct nlattr *nla,
81 struct nlattr *est, struct tc_action **a,
82 int ovr, int bind)
83{
84 struct tc_action_net *tn = net_generic(net, simp_net_id);
85 struct nlattr *tb[TCA_DEF_MAX + 1];
86 struct tc_defact *parm;
87 struct tcf_defact *d;
88 bool exists = false;
89 int ret = 0, err;
90
91 if (nla == NULL)
92 return -EINVAL;
93
94 err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
95 if (err < 0)
96 return err;
97
98 if (tb[TCA_DEF_PARMS] == NULL)
99 return -EINVAL;
100
101 parm = nla_data(tb[TCA_DEF_PARMS]);
102 exists = tcf_idr_check(tn, parm->index, a, bind);
103 if (exists && bind)
104 return 0;
105
106 if (tb[TCA_DEF_DATA] == NULL) {
107 if (exists)
108 tcf_idr_release(*a, bind);
109 return -EINVAL;
110 }
111
112 if (!exists) {
113 ret = tcf_idr_create(tn, parm->index, est, a,
114 &act_simp_ops, bind, false);
115 if (ret)
116 return ret;
117
118 d = to_defact(*a);
119 ret = alloc_defdata(d, tb[TCA_DEF_DATA]);
120 if (ret < 0) {
121 tcf_idr_release(*a, bind);
122 return ret;
123 }
124 d->tcf_action = parm->action;
125 ret = ACT_P_CREATED;
126 } else {
127 d = to_defact(*a);
128
129 if (!ovr) {
130 tcf_idr_release(*a, bind);
131 return -EEXIST;
132 }
133
134 reset_policy(d, tb[TCA_DEF_DATA], parm);
135 }
136
137 if (ret == ACT_P_CREATED)
138 tcf_idr_insert(tn, *a);
139 return ret;
140}
141
142static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
143 int bind, int ref)
144{
145 unsigned char *b = skb_tail_pointer(skb);
146 struct tcf_defact *d = to_defact(a);
147 struct tc_defact opt = {
148 .index = d->tcf_index,
149 .refcnt = d->tcf_refcnt - ref,
150 .bindcnt = d->tcf_bindcnt - bind,
151 .action = d->tcf_action,
152 };
153 struct tcf_t t;
154
155 if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
156 nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
157 goto nla_put_failure;
158
159 tcf_tm_dump(&t, &d->tcf_tm);
160 if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
161 goto nla_put_failure;
162 return skb->len;
163
164nla_put_failure:
165 nlmsg_trim(skb, b);
166 return -1;
167}
168
169static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
170 struct netlink_callback *cb, int type,
171 const struct tc_action_ops *ops)
172{
173 struct tc_action_net *tn = net_generic(net, simp_net_id);
174
175 return tcf_generic_walker(tn, skb, cb, type, ops);
176}
177
178static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
179{
180 struct tc_action_net *tn = net_generic(net, simp_net_id);
181
182 return tcf_idr_search(tn, a, index);
183}
184
185static struct tc_action_ops act_simp_ops = {
186 .kind = "simple",
187 .type = TCA_ACT_SIMP,
188 .owner = THIS_MODULE,
189 .act = tcf_simp,
190 .dump = tcf_simp_dump,
191 .cleanup = tcf_simp_release,
192 .init = tcf_simp_init,
193 .walk = tcf_simp_walker,
194 .lookup = tcf_simp_search,
195 .size = sizeof(struct tcf_defact),
196};
197
198static __net_init int simp_init_net(struct net *net)
199{
200 struct tc_action_net *tn = net_generic(net, simp_net_id);
201
202 return tc_action_net_init(tn, &act_simp_ops);
203}
204
205static void __net_exit simp_exit_net(struct net *net)
206{
207 struct tc_action_net *tn = net_generic(net, simp_net_id);
208
209 tc_action_net_exit(tn);
210}
211
212static struct pernet_operations simp_net_ops = {
213 .init = simp_init_net,
214 .exit = simp_exit_net,
215 .id = &simp_net_id,
216 .size = sizeof(struct tc_action_net),
217};
218
219MODULE_AUTHOR("Jamal Hadi Salim(2005)");
220MODULE_DESCRIPTION("Simple example action");
221MODULE_LICENSE("GPL");
222
223static int __init simp_init_module(void)
224{
225 int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
226 if (!ret)
227 pr_info("Simple TC action Loaded\n");
228 return ret;
229}
230
231static void __exit simp_cleanup_module(void)
232{
233 tcf_unregister_action(&act_simp_ops, &simp_net_ops);
234}
235
236module_init(simp_init_module);
237module_exit(simp_cleanup_module);
238
