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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_net_id;
34
35static int xt_net_id;
36
37static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
38{
39 struct xt_tgchk_param par;
40 struct xt_target *target;
41 int ret = 0;
42
43 target = xt_request_find_target(AF_INET, t->u.user.name,
44 t->u.user.revision);
45 if (IS_ERR(target))
46 return PTR_ERR(target);
47
48 t->u.kernel.target = target;
49 par.table = table;
50 par.entryinfo = NULL;
51 par.target = target;
52 par.targinfo = t->data;
53 par.hook_mask = hook;
54 par.family = NFPROTO_IPV4;
55
56 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
57 if (ret < 0) {
58 module_put(t->u.kernel.target->me);
59 return ret;
60 }
61 return 0;
62}
63
64static void ipt_destroy_target(struct xt_entry_target *t)
65{
66 struct xt_tgdtor_param par = {
67 .target = t->u.kernel.target,
68 .targinfo = t->data,
69 .family = NFPROTO_IPV4,
70 };
71 if (par.target->destroy != NULL)
72 par.target->destroy(&par);
73 module_put(par.target->me);
74}
75
76static void tcf_ipt_release(struct tc_action *a, int bind)
77{
78 struct tcf_ipt *ipt = to_ipt(a);
79 ipt_destroy_target(ipt->tcfi_t);
80 kfree(ipt->tcfi_tname);
81 kfree(ipt->tcfi_t);
82}
83
84static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
85 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
86 [TCA_IPT_HOOK] = { .type = NLA_U32 },
87 [TCA_IPT_INDEX] = { .type = NLA_U32 },
88 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
89};
90
91static int __tcf_ipt_init(struct tc_action_net *tn, struct nlattr *nla,
92 struct nlattr *est, struct tc_action *a, int ovr,
93 int bind)
94{
95 struct nlattr *tb[TCA_IPT_MAX + 1];
96 struct tcf_ipt *ipt;
97 struct xt_entry_target *td, *t;
98 char *tname;
99 int ret = 0, err, exists = 0;
100 u32 hook = 0;
101 u32 index = 0;
102
103 if (nla == NULL)
104 return -EINVAL;
105
106 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
107 if (err < 0)
108 return err;
109
110 if (tb[TCA_IPT_INDEX] != NULL)
111 index = nla_get_u32(tb[TCA_IPT_INDEX]);
112
113 exists = tcf_hash_check(tn, index, a, bind);
114 if (exists && bind)
115 return 0;
116
117 if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
118 if (exists)
119 tcf_hash_release(a, bind);
120 return -EINVAL;
121 }
122
123 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
124 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
125 return -EINVAL;
126
127 if (!tcf_hash_check(tn, index, a, bind)) {
128 ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
129 false);
130 if (ret)
131 return ret;
132 ret = ACT_P_CREATED;
133 } else {
134 if (bind)
135 return 0;
136 tcf_hash_release(a, bind);
137
138 if (!ovr)
139 return -EEXIST;
140 }
141 ipt = to_ipt(a);
142
143 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
144
145 err = -ENOMEM;
146 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
147 if (unlikely(!tname))
148 goto err1;
149 if (tb[TCA_IPT_TABLE] == NULL ||
150 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
151 strcpy(tname, "mangle");
152
153 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
154 if (unlikely(!t))
155 goto err2;
156
157 err = ipt_init_target(t, tname, hook);
158 if (err < 0)
159 goto err3;
160
161 spin_lock_bh(&ipt->tcf_lock);
162 if (ret != ACT_P_CREATED) {
163 ipt_destroy_target(ipt->tcfi_t);
164 kfree(ipt->tcfi_tname);
165 kfree(ipt->tcfi_t);
166 }
167 ipt->tcfi_tname = tname;
168 ipt->tcfi_t = t;
169 ipt->tcfi_hook = hook;
170 spin_unlock_bh(&ipt->tcf_lock);
171 if (ret == ACT_P_CREATED)
172 tcf_hash_insert(tn, a);
173 return ret;
174
175err3:
176 kfree(t);
177err2:
178 kfree(tname);
179err1:
180 if (ret == ACT_P_CREATED)
181 tcf_hash_cleanup(a, est);
182 return err;
183}
184
185static int tcf_ipt_init(struct net *net, struct nlattr *nla,
186 struct nlattr *est, struct tc_action *a, int ovr,
187 int bind)
188{
189 struct tc_action_net *tn = net_generic(net, ipt_net_id);
190
191 return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
192}
193
194static int tcf_xt_init(struct net *net, struct nlattr *nla,
195 struct nlattr *est, struct tc_action *a, int ovr,
196 int bind)
197{
198 struct tc_action_net *tn = net_generic(net, xt_net_id);
199
200 return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
201}
202
203static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
204 struct tcf_result *res)
205{
206 int ret = 0, result = 0;
207 struct tcf_ipt *ipt = a->priv;
208 struct xt_action_param par;
209
210 if (skb_unclone(skb, GFP_ATOMIC))
211 return TC_ACT_UNSPEC;
212
213 spin_lock(&ipt->tcf_lock);
214
215 ipt->tcf_tm.lastuse = jiffies;
216 bstats_update(&ipt->tcf_bstats, skb);
217
218
219
220
221
222 par.net = dev_net(skb->dev);
223 par.in = skb->dev;
224 par.out = NULL;
225 par.hooknum = ipt->tcfi_hook;
226 par.target = ipt->tcfi_t->u.kernel.target;
227 par.targinfo = ipt->tcfi_t->data;
228 par.family = NFPROTO_IPV4;
229 ret = par.target->target(skb, &par);
230
231 switch (ret) {
232 case NF_ACCEPT:
233 result = TC_ACT_OK;
234 break;
235 case NF_DROP:
236 result = TC_ACT_SHOT;
237 ipt->tcf_qstats.drops++;
238 break;
239 case XT_CONTINUE:
240 result = TC_ACT_PIPE;
241 break;
242 default:
243 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
244 ret);
245 result = TC_POLICE_OK;
246 break;
247 }
248 spin_unlock(&ipt->tcf_lock);
249 return result;
250
251}
252
253static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
254{
255 unsigned char *b = skb_tail_pointer(skb);
256 struct tcf_ipt *ipt = a->priv;
257 struct xt_entry_target *t;
258 struct tcf_t tm;
259 struct tc_cnt c;
260
261
262
263
264
265
266 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
267 if (unlikely(!t))
268 goto nla_put_failure;
269
270 c.bindcnt = ipt->tcf_bindcnt - bind;
271 c.refcnt = ipt->tcf_refcnt - ref;
272 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
273
274 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
275 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
276 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
277 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
278 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
279 goto nla_put_failure;
280 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
281 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
282 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
283 if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
284 goto nla_put_failure;
285 kfree(t);
286 return skb->len;
287
288nla_put_failure:
289 nlmsg_trim(skb, b);
290 kfree(t);
291 return -1;
292}
293
294static int tcf_ipt_walker(struct net *net, struct sk_buff *skb,
295 struct netlink_callback *cb, int type,
296 struct tc_action *a)
297{
298 struct tc_action_net *tn = net_generic(net, ipt_net_id);
299
300 return tcf_generic_walker(tn, skb, cb, type, a);
301}
302
303static int tcf_ipt_search(struct net *net, struct tc_action *a, u32 index)
304{
305 struct tc_action_net *tn = net_generic(net, ipt_net_id);
306
307 return tcf_hash_search(tn, a, index);
308}
309
310static struct tc_action_ops act_ipt_ops = {
311 .kind = "ipt",
312 .type = TCA_ACT_IPT,
313 .owner = THIS_MODULE,
314 .act = tcf_ipt,
315 .dump = tcf_ipt_dump,
316 .cleanup = tcf_ipt_release,
317 .init = tcf_ipt_init,
318 .walk = tcf_ipt_walker,
319 .lookup = tcf_ipt_search,
320};
321
322static __net_init int ipt_init_net(struct net *net)
323{
324 struct tc_action_net *tn = net_generic(net, ipt_net_id);
325
326 return tc_action_net_init(tn, &act_ipt_ops, IPT_TAB_MASK);
327}
328
329static void __net_exit ipt_exit_net(struct net *net)
330{
331 struct tc_action_net *tn = net_generic(net, ipt_net_id);
332
333 tc_action_net_exit(tn);
334}
335
336static struct pernet_operations ipt_net_ops = {
337 .init = ipt_init_net,
338 .exit = ipt_exit_net,
339 .id = &ipt_net_id,
340 .size = sizeof(struct tc_action_net),
341};
342
343static int tcf_xt_walker(struct net *net, struct sk_buff *skb,
344 struct netlink_callback *cb, int type,
345 struct tc_action *a)
346{
347 struct tc_action_net *tn = net_generic(net, xt_net_id);
348
349 return tcf_generic_walker(tn, skb, cb, type, a);
350}
351
352static int tcf_xt_search(struct net *net, struct tc_action *a, u32 index)
353{
354 struct tc_action_net *tn = net_generic(net, xt_net_id);
355
356 return tcf_hash_search(tn, a, index);
357}
358
359static struct tc_action_ops act_xt_ops = {
360 .kind = "xt",
361 .type = TCA_ACT_XT,
362 .owner = THIS_MODULE,
363 .act = tcf_ipt,
364 .dump = tcf_ipt_dump,
365 .cleanup = tcf_ipt_release,
366 .init = tcf_xt_init,
367 .walk = tcf_xt_walker,
368 .lookup = tcf_xt_search,
369};
370
371static __net_init int xt_init_net(struct net *net)
372{
373 struct tc_action_net *tn = net_generic(net, xt_net_id);
374
375 return tc_action_net_init(tn, &act_xt_ops, IPT_TAB_MASK);
376}
377
378static void __net_exit xt_exit_net(struct net *net)
379{
380 struct tc_action_net *tn = net_generic(net, xt_net_id);
381
382 tc_action_net_exit(tn);
383}
384
385static struct pernet_operations xt_net_ops = {
386 .init = xt_init_net,
387 .exit = xt_exit_net,
388 .id = &xt_net_id,
389 .size = sizeof(struct tc_action_net),
390};
391
392MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
393MODULE_DESCRIPTION("Iptables target actions");
394MODULE_LICENSE("GPL");
395MODULE_ALIAS("act_xt");
396
397static int __init ipt_init_module(void)
398{
399 int ret1, ret2;
400
401 ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
402 if (ret1 < 0)
403 pr_err("Failed to load xt action\n");
404
405 ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
406 if (ret2 < 0)
407 pr_err("Failed to load ipt action\n");
408
409 if (ret1 < 0 && ret2 < 0) {
410 return ret1;
411 } else
412 return 0;
413}
414
415static void __exit ipt_cleanup_module(void)
416{
417 tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
418 tcf_unregister_action(&act_xt_ops, &xt_net_ops);
419}
420
421module_init(ipt_init_module);
422module_exit(ipt_cleanup_module);
423
