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Linux/net/sched/act_ipt.c

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  1 /*
  2  * net/sched/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 (2002-4)
 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 static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
 33 static u32 ipt_idx_gen;
 34 static DEFINE_RWLOCK(ipt_lock);
 35 
 36 static struct tcf_hashinfo ipt_hash_info = {
 37         .htab   =       tcf_ipt_ht,
 38         .hmask  =       IPT_TAB_MASK,
 39         .lock   =       &ipt_lock,
 40 };
 41 
 42 static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
 43 {
 44         struct xt_tgchk_param par;
 45         struct xt_target *target;
 46         int ret = 0;
 47 
 48         target = xt_request_find_target(AF_INET, t->u.user.name,
 49                                         t->u.user.revision);
 50         if (IS_ERR(target))
 51                 return PTR_ERR(target);
 52 
 53         t->u.kernel.target = target;
 54         par.table     = table;
 55         par.entryinfo = NULL;
 56         par.target    = target;
 57         par.targinfo  = t->data;
 58         par.hook_mask = hook;
 59         par.family    = NFPROTO_IPV4;
 60 
 61         ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
 62         if (ret < 0) {
 63                 module_put(t->u.kernel.target->me);
 64                 return ret;
 65         }
 66         return 0;
 67 }
 68 
 69 static void ipt_destroy_target(struct xt_entry_target *t)
 70 {
 71         struct xt_tgdtor_param par = {
 72                 .target   = t->u.kernel.target,
 73                 .targinfo = t->data,
 74         };
 75         if (par.target->destroy != NULL)
 76                 par.target->destroy(&par);
 77         module_put(par.target->me);
 78 }
 79 
 80 static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
 81 {
 82         int ret = 0;
 83         if (ipt) {
 84                 if (bind)
 85                         ipt->tcf_bindcnt--;
 86                 ipt->tcf_refcnt--;
 87                 if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
 88                         ipt_destroy_target(ipt->tcfi_t);
 89                         kfree(ipt->tcfi_tname);
 90                         kfree(ipt->tcfi_t);
 91                         tcf_hash_destroy(&ipt->common, &ipt_hash_info);
 92                         ret = ACT_P_DELETED;
 93                 }
 94         }
 95         return ret;
 96 }
 97 
 98 static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
 99         [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
100         [TCA_IPT_HOOK]  = { .type = NLA_U32 },
101         [TCA_IPT_INDEX] = { .type = NLA_U32 },
102         [TCA_IPT_TARG]  = { .len = sizeof(struct xt_entry_target) },
103 };
104 
105 static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est,
106                         struct tc_action *a, int ovr, int bind)
107 {
108         struct nlattr *tb[TCA_IPT_MAX + 1];
109         struct tcf_ipt *ipt;
110         struct tcf_common *pc;
111         struct xt_entry_target *td, *t;
112         char *tname;
113         int ret = 0, err;
114         u32 hook = 0;
115         u32 index = 0;
116 
117         if (nla == NULL)
118                 return -EINVAL;
119 
120         err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
121         if (err < 0)
122                 return err;
123 
124         if (tb[TCA_IPT_HOOK] == NULL)
125                 return -EINVAL;
126         if (tb[TCA_IPT_TARG] == NULL)
127                 return -EINVAL;
128 
129         td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
130         if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
131                 return -EINVAL;
132 
133         if (tb[TCA_IPT_INDEX] != NULL)
134                 index = nla_get_u32(tb[TCA_IPT_INDEX]);
135 
136         pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
137         if (!pc) {
138                 pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
139                                      &ipt_idx_gen, &ipt_hash_info);
140                 if (IS_ERR(pc))
141                         return PTR_ERR(pc);
142                 ret = ACT_P_CREATED;
143         } else {
144                 if (!ovr) {
145                         tcf_ipt_release(to_ipt(pc), bind);
146                         return -EEXIST;
147                 }
148         }
149         ipt = to_ipt(pc);
150 
151         hook = nla_get_u32(tb[TCA_IPT_HOOK]);
152 
153         err = -ENOMEM;
154         tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
155         if (unlikely(!tname))
156                 goto err1;
157         if (tb[TCA_IPT_TABLE] == NULL ||
158             nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
159                 strcpy(tname, "mangle");
160 
161         t = kmemdup(td, td->u.target_size, GFP_KERNEL);
162         if (unlikely(!t))
163                 goto err2;
164 
165         err = ipt_init_target(t, tname, hook);
166         if (err < 0)
167                 goto err3;
168 
169         spin_lock_bh(&ipt->tcf_lock);
170         if (ret != ACT_P_CREATED) {
171                 ipt_destroy_target(ipt->tcfi_t);
172                 kfree(ipt->tcfi_tname);
173                 kfree(ipt->tcfi_t);
174         }
175         ipt->tcfi_tname = tname;
176         ipt->tcfi_t     = t;
177         ipt->tcfi_hook  = hook;
178         spin_unlock_bh(&ipt->tcf_lock);
179         if (ret == ACT_P_CREATED)
180                 tcf_hash_insert(pc, &ipt_hash_info);
181         return ret;
182 
183 err3:
184         kfree(t);
185 err2:
186         kfree(tname);
187 err1:
188         if (ret == ACT_P_CREATED) {
189                 if (est)
190                         gen_kill_estimator(&pc->tcfc_bstats,
191                                            &pc->tcfc_rate_est);
192                 kfree_rcu(pc, tcfc_rcu);
193         }
194         return err;
195 }
196 
197 static int tcf_ipt_cleanup(struct tc_action *a, int bind)
198 {
199         struct tcf_ipt *ipt = a->priv;
200         return tcf_ipt_release(ipt, bind);
201 }
202 
203 static 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_cloned(skb)) {
211                 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
212                         return TC_ACT_UNSPEC;
213         }
214 
215         spin_lock(&ipt->tcf_lock);
216 
217         ipt->tcf_tm.lastuse = jiffies;
218         bstats_update(&ipt->tcf_bstats, skb);
219 
220         /* yes, we have to worry about both in and out dev
221          * worry later - danger - this API seems to have changed
222          * from earlier kernels
223          */
224         par.in       = skb->dev;
225         par.out      = NULL;
226         par.hooknum  = ipt->tcfi_hook;
227         par.target   = ipt->tcfi_t->u.kernel.target;
228         par.targinfo = ipt->tcfi_t->data;
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 
253 static 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         /* for simple targets kernel size == user size
262          * user name = target name
263          * for foolproof you need to not assume this
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 
288 nla_put_failure:
289         nlmsg_trim(skb, b);
290         kfree(t);
291         return -1;
292 }
293 
294 static struct tc_action_ops act_ipt_ops = {
295         .kind           =       "ipt",
296         .hinfo          =       &ipt_hash_info,
297         .type           =       TCA_ACT_IPT,
298         .capab          =       TCA_CAP_NONE,
299         .owner          =       THIS_MODULE,
300         .act            =       tcf_ipt,
301         .dump           =       tcf_ipt_dump,
302         .cleanup        =       tcf_ipt_cleanup,
303         .lookup         =       tcf_hash_search,
304         .init           =       tcf_ipt_init,
305         .walk           =       tcf_generic_walker
306 };
307 
308 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
309 MODULE_DESCRIPTION("Iptables target actions");
310 MODULE_LICENSE("GPL");
311 
312 static int __init ipt_init_module(void)
313 {
314         return tcf_register_action(&act_ipt_ops);
315 }
316 
317 static void __exit ipt_cleanup_module(void)
318 {
319         tcf_unregister_action(&act_ipt_ops);
320 }
321 
322 module_init(ipt_init_module);
323 module_exit(ipt_cleanup_module);
324 

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