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14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/skbuff.h>
19#include <linux/rtnetlink.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/netlink.h>
24#include <net/pkt_sched.h>
25#include <linux/tc_act/tc_ipt.h>
26#include <net/tc_act/tc_ipt.h>
27
28#include <linux/netfilter_ipv4/ip_tables.h>
29
30
31#define IPT_TAB_MASK 15
32
33static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
34{
35 struct xt_tgchk_param par;
36 struct xt_target *target;
37 int ret = 0;
38
39 target = xt_request_find_target(AF_INET, t->u.user.name,
40 t->u.user.revision);
41 if (IS_ERR(target))
42 return PTR_ERR(target);
43
44 t->u.kernel.target = target;
45 par.table = table;
46 par.entryinfo = NULL;
47 par.target = target;
48 par.targinfo = t->data;
49 par.hook_mask = hook;
50 par.family = NFPROTO_IPV4;
51
52 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
53 if (ret < 0) {
54 module_put(t->u.kernel.target->me);
55 return ret;
56 }
57 return 0;
58}
59
60static void ipt_destroy_target(struct xt_entry_target *t)
61{
62 struct xt_tgdtor_param par = {
63 .target = t->u.kernel.target,
64 .targinfo = t->data,
65 };
66 if (par.target->destroy != NULL)
67 par.target->destroy(&par);
68 module_put(par.target->me);
69}
70
71static void tcf_ipt_release(struct tc_action *a, int bind)
72{
73 struct tcf_ipt *ipt = to_ipt(a);
74 ipt_destroy_target(ipt->tcfi_t);
75 kfree(ipt->tcfi_tname);
76 kfree(ipt->tcfi_t);
77}
78
79static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
80 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
81 [TCA_IPT_HOOK] = { .type = NLA_U32 },
82 [TCA_IPT_INDEX] = { .type = NLA_U32 },
83 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
84};
85
86static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
87 struct tc_action *a, int ovr, int bind)
88{
89 struct nlattr *tb[TCA_IPT_MAX + 1];
90 struct tcf_ipt *ipt;
91 struct xt_entry_target *td, *t;
92 char *tname;
93 int ret = 0, err;
94 u32 hook = 0;
95 u32 index = 0;
96
97 if (nla == NULL)
98 return -EINVAL;
99
100 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
101 if (err < 0)
102 return err;
103
104 if (tb[TCA_IPT_HOOK] == NULL)
105 return -EINVAL;
106 if (tb[TCA_IPT_TARG] == NULL)
107 return -EINVAL;
108
109 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
110 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
111 return -EINVAL;
112
113 if (tb[TCA_IPT_INDEX] != NULL)
114 index = nla_get_u32(tb[TCA_IPT_INDEX]);
115
116 if (!tcf_hash_check(index, a, bind) ) {
117 ret = tcf_hash_create(index, est, a, sizeof(*ipt), bind);
118 if (ret)
119 return ret;
120 ret = ACT_P_CREATED;
121 } else {
122 if (bind)
123 return 0;
124 tcf_hash_release(a, bind);
125
126 if (!ovr)
127 return -EEXIST;
128 }
129 ipt = to_ipt(a);
130
131 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
132
133 err = -ENOMEM;
134 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
135 if (unlikely(!tname))
136 goto err1;
137 if (tb[TCA_IPT_TABLE] == NULL ||
138 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
139 strcpy(tname, "mangle");
140
141 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
142 if (unlikely(!t))
143 goto err2;
144
145 err = ipt_init_target(t, tname, hook);
146 if (err < 0)
147 goto err3;
148
149 spin_lock_bh(&ipt->tcf_lock);
150 if (ret != ACT_P_CREATED) {
151 ipt_destroy_target(ipt->tcfi_t);
152 kfree(ipt->tcfi_tname);
153 kfree(ipt->tcfi_t);
154 }
155 ipt->tcfi_tname = tname;
156 ipt->tcfi_t = t;
157 ipt->tcfi_hook = hook;
158 spin_unlock_bh(&ipt->tcf_lock);
159 if (ret == ACT_P_CREATED)
160 tcf_hash_insert(a);
161 return ret;
162
163err3:
164 kfree(t);
165err2:
166 kfree(tname);
167err1:
168 if (ret == ACT_P_CREATED)
169 tcf_hash_cleanup(a, est);
170 return err;
171}
172
173static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
174 struct tcf_result *res)
175{
176 int ret = 0, result = 0;
177 struct tcf_ipt *ipt = a->priv;
178 struct xt_action_param par;
179
180 if (skb_unclone(skb, GFP_ATOMIC))
181 return TC_ACT_UNSPEC;
182
183 spin_lock(&ipt->tcf_lock);
184
185 ipt->tcf_tm.lastuse = jiffies;
186 bstats_update(&ipt->tcf_bstats, skb);
187
188
189
190
191
192 par.in = skb->dev;
193 par.out = NULL;
194 par.hooknum = ipt->tcfi_hook;
195 par.target = ipt->tcfi_t->u.kernel.target;
196 par.targinfo = ipt->tcfi_t->data;
197 ret = par.target->target(skb, &par);
198
199 switch (ret) {
200 case NF_ACCEPT:
201 result = TC_ACT_OK;
202 break;
203 case NF_DROP:
204 result = TC_ACT_SHOT;
205 ipt->tcf_qstats.drops++;
206 break;
207 case XT_CONTINUE:
208 result = TC_ACT_PIPE;
209 break;
210 default:
211 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
212 ret);
213 result = TC_POLICE_OK;
214 break;
215 }
216 spin_unlock(&ipt->tcf_lock);
217 return result;
218
219}
220
221static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
222{
223 unsigned char *b = skb_tail_pointer(skb);
224 struct tcf_ipt *ipt = a->priv;
225 struct xt_entry_target *t;
226 struct tcf_t tm;
227 struct tc_cnt c;
228
229
230
231
232
233
234 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
235 if (unlikely(!t))
236 goto nla_put_failure;
237
238 c.bindcnt = ipt->tcf_bindcnt - bind;
239 c.refcnt = ipt->tcf_refcnt - ref;
240 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
241
242 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
243 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
244 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
245 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
246 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
247 goto nla_put_failure;
248 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
249 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
250 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
251 if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
252 goto nla_put_failure;
253 kfree(t);
254 return skb->len;
255
256nla_put_failure:
257 nlmsg_trim(skb, b);
258 kfree(t);
259 return -1;
260}
261
262static struct tc_action_ops act_ipt_ops = {
263 .kind = "ipt",
264 .type = TCA_ACT_IPT,
265 .owner = THIS_MODULE,
266 .act = tcf_ipt,
267 .dump = tcf_ipt_dump,
268 .cleanup = tcf_ipt_release,
269 .init = tcf_ipt_init,
270};
271
272static struct tc_action_ops act_xt_ops = {
273 .kind = "xt",
274 .type = TCA_ACT_XT,
275 .owner = THIS_MODULE,
276 .act = tcf_ipt,
277 .dump = tcf_ipt_dump,
278 .cleanup = tcf_ipt_release,
279 .init = tcf_ipt_init,
280};
281
282MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
283MODULE_DESCRIPTION("Iptables target actions");
284MODULE_LICENSE("GPL");
285MODULE_ALIAS("act_xt");
286
287static int __init ipt_init_module(void)
288{
289 int ret1, ret2;
290
291 ret1 = tcf_register_action(&act_xt_ops, IPT_TAB_MASK);
292 if (ret1 < 0)
293 printk("Failed to load xt action\n");
294 ret2 = tcf_register_action(&act_ipt_ops, IPT_TAB_MASK);
295 if (ret2 < 0)
296 printk("Failed to load ipt action\n");
297
298 if (ret1 < 0 && ret2 < 0) {
299 return ret1;
300 } else
301 return 0;
302}
303
304static void __exit ipt_cleanup_module(void)
305{
306 tcf_unregister_action(&act_xt_ops);
307 tcf_unregister_action(&act_ipt_ops);
308}
309
310module_init(ipt_init_module);
311module_exit(ipt_cleanup_module);
312
