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Linux/net/sched/act_ipt.c

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  1 /*
  2  * net/sched/act_ipt.c          iptables target interface
  3  *
  4  *TODO: Add other tables. For now we only support the ipv4 table targets
  5  *
  6  *              This program is free software; you can redistribute it and/or
  7  *              modify it under the terms of the GNU General Public License
  8  *              as published by the Free Software Foundation; either version
  9  *              2 of the License, or (at your option) any later version.
 10  *
 11  * Copyright:   Jamal Hadi Salim (2002-13)
 12  */
 13 
 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 
 33 static 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         struct ipt_entry e = {};
 38         int ret = 0;
 39 
 40         target = xt_request_find_target(AF_INET, t->u.user.name,
 41                                         t->u.user.revision);
 42         if (IS_ERR(target))
 43                 return PTR_ERR(target);
 44 
 45         t->u.kernel.target = target;
 46         memset(&par, 0, sizeof(par));
 47         par.table     = table;
 48         par.entryinfo = &e;
 49         par.target    = target;
 50         par.targinfo  = t->data;
 51         par.hook_mask = hook;
 52         par.family    = NFPROTO_IPV4;
 53 
 54         ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
 55         if (ret < 0) {
 56                 module_put(t->u.kernel.target->me);
 57                 return ret;
 58         }
 59         return 0;
 60 }
 61 
 62 static void ipt_destroy_target(struct xt_entry_target *t)
 63 {
 64         struct xt_tgdtor_param par = {
 65                 .target   = t->u.kernel.target,
 66                 .targinfo = t->data,
 67         };
 68         if (par.target->destroy != NULL)
 69                 par.target->destroy(&par);
 70         module_put(par.target->me);
 71 }
 72 
 73 static void tcf_ipt_release(struct tc_action *a, int bind)
 74 {
 75         struct tcf_ipt *ipt = to_ipt(a);
 76         ipt_destroy_target(ipt->tcfi_t);
 77         kfree(ipt->tcfi_tname);
 78         kfree(ipt->tcfi_t);
 79 }
 80 
 81 static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
 82         [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
 83         [TCA_IPT_HOOK]  = { .type = NLA_U32 },
 84         [TCA_IPT_INDEX] = { .type = NLA_U32 },
 85         [TCA_IPT_TARG]  = { .len = sizeof(struct xt_entry_target) },
 86 };
 87 
 88 static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 89                         struct tc_action *a, int ovr, int bind)
 90 {
 91         struct nlattr *tb[TCA_IPT_MAX + 1];
 92         struct tcf_ipt *ipt;
 93         struct xt_entry_target *td, *t;
 94         char *tname;
 95         int ret = 0, err;
 96         u32 hook = 0;
 97         u32 index = 0;
 98 
 99         if (nla == NULL)
100                 return -EINVAL;
101 
102         err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
103         if (err < 0)
104                 return err;
105 
106         if (tb[TCA_IPT_HOOK] == NULL)
107                 return -EINVAL;
108         if (tb[TCA_IPT_TARG] == NULL)
109                 return -EINVAL;
110 
111         td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
112         if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
113                 return -EINVAL;
114 
115         if (tb[TCA_IPT_INDEX] != NULL)
116                 index = nla_get_u32(tb[TCA_IPT_INDEX]);
117 
118         if (!tcf_hash_check(index, a, bind) ) {
119                 ret = tcf_hash_create(index, est, a, sizeof(*ipt), bind, false);
120                 if (ret)
121                         return ret;
122                 ret = ACT_P_CREATED;
123         } else {
124                 if (bind)/* dont override defaults */
125                         return 0;
126                 tcf_hash_release(a, bind);
127 
128                 if (!ovr)
129                         return -EEXIST;
130         }
131         ipt = to_ipt(a);
132 
133         hook = nla_get_u32(tb[TCA_IPT_HOOK]);
134 
135         err = -ENOMEM;
136         tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
137         if (unlikely(!tname))
138                 goto err1;
139         if (tb[TCA_IPT_TABLE] == NULL ||
140             nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
141                 strcpy(tname, "mangle");
142 
143         t = kmemdup(td, td->u.target_size, GFP_KERNEL);
144         if (unlikely(!t))
145                 goto err2;
146 
147         err = ipt_init_target(t, tname, hook);
148         if (err < 0)
149                 goto err3;
150 
151         spin_lock_bh(&ipt->tcf_lock);
152         if (ret != ACT_P_CREATED) {
153                 ipt_destroy_target(ipt->tcfi_t);
154                 kfree(ipt->tcfi_tname);
155                 kfree(ipt->tcfi_t);
156         }
157         ipt->tcfi_tname = tname;
158         ipt->tcfi_t     = t;
159         ipt->tcfi_hook  = hook;
160         spin_unlock_bh(&ipt->tcf_lock);
161         if (ret == ACT_P_CREATED)
162                 tcf_hash_insert(a);
163         return ret;
164 
165 err3:
166         kfree(t);
167 err2:
168         kfree(tname);
169 err1:
170         if (ret == ACT_P_CREATED)
171                 tcf_hash_cleanup(a, est);
172         return err;
173 }
174 
175 static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
176                    struct tcf_result *res)
177 {
178         int ret = 0, result = 0;
179         struct tcf_ipt *ipt = a->priv;
180         struct xt_action_param par;
181 
182         if (skb_unclone(skb, GFP_ATOMIC))
183                 return TC_ACT_UNSPEC;
184 
185         spin_lock(&ipt->tcf_lock);
186 
187         ipt->tcf_tm.lastuse = jiffies;
188         bstats_update(&ipt->tcf_bstats, skb);
189 
190         /* yes, we have to worry about both in and out dev
191          * worry later - danger - this API seems to have changed
192          * from earlier kernels
193          */
194         par.net      = dev_net(skb->dev);
195         par.in       = skb->dev;
196         par.out      = NULL;
197         par.hooknum  = ipt->tcfi_hook;
198         par.target   = ipt->tcfi_t->u.kernel.target;
199         par.targinfo = ipt->tcfi_t->data;
200         ret = par.target->target(skb, &par);
201 
202         switch (ret) {
203         case NF_ACCEPT:
204                 result = TC_ACT_OK;
205                 break;
206         case NF_DROP:
207                 result = TC_ACT_SHOT;
208                 ipt->tcf_qstats.drops++;
209                 break;
210         case XT_CONTINUE:
211                 result = TC_ACT_PIPE;
212                 break;
213         default:
214                 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
215                                        ret);
216                 result = TC_POLICE_OK;
217                 break;
218         }
219         spin_unlock(&ipt->tcf_lock);
220         return result;
221 
222 }
223 
224 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
225 {
226         unsigned char *b = skb_tail_pointer(skb);
227         struct tcf_ipt *ipt = a->priv;
228         struct xt_entry_target *t;
229         struct tcf_t tm;
230         struct tc_cnt c;
231 
232         /* for simple targets kernel size == user size
233          * user name = target name
234          * for foolproof you need to not assume this
235          */
236 
237         t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
238         if (unlikely(!t))
239                 goto nla_put_failure;
240 
241         c.bindcnt = ipt->tcf_bindcnt - bind;
242         c.refcnt = ipt->tcf_refcnt - ref;
243         strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
244 
245         if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
246             nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
247             nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
248             nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
249             nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
250                 goto nla_put_failure;
251         tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
252         tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
253         tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
254         if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
255                 goto nla_put_failure;
256         kfree(t);
257         return skb->len;
258 
259 nla_put_failure:
260         nlmsg_trim(skb, b);
261         kfree(t);
262         return -1;
263 }
264 
265 static struct tc_action_ops act_ipt_ops = {
266         .kind           =       "ipt",
267         .type           =       TCA_ACT_IPT,
268         .owner          =       THIS_MODULE,
269         .act            =       tcf_ipt,
270         .dump           =       tcf_ipt_dump,
271         .cleanup        =       tcf_ipt_release,
272         .init           =       tcf_ipt_init,
273 };
274 
275 static struct tc_action_ops act_xt_ops = {
276         .kind           =       "xt",
277         .type           =       TCA_ACT_XT,
278         .owner          =       THIS_MODULE,
279         .act            =       tcf_ipt,
280         .dump           =       tcf_ipt_dump,
281         .cleanup        =       tcf_ipt_release,
282         .init           =       tcf_ipt_init,
283 };
284 
285 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
286 MODULE_DESCRIPTION("Iptables target actions");
287 MODULE_LICENSE("GPL");
288 MODULE_ALIAS("act_xt");
289 
290 static int __init ipt_init_module(void)
291 {
292         int ret1, ret2;
293 
294         ret1 = tcf_register_action(&act_xt_ops, IPT_TAB_MASK);
295         if (ret1 < 0)
296                 printk("Failed to load xt action\n");
297         ret2 = tcf_register_action(&act_ipt_ops, IPT_TAB_MASK);
298         if (ret2 < 0)
299                 printk("Failed to load ipt action\n");
300 
301         if (ret1 < 0 && ret2 < 0) {
302                 return ret1;
303         } else
304                 return 0;
305 }
306 
307 static void __exit ipt_cleanup_module(void)
308 {
309         tcf_unregister_action(&act_xt_ops);
310         tcf_unregister_action(&act_ipt_ops);
311 }
312 
313 module_init(ipt_init_module);
314 module_exit(ipt_cleanup_module);
315 

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