net/sched/cls_fw.c

   1 /*
   2  * net/sched/cls_fw.c   Classifier mapping ipchains' fwmark to traffic class.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  * Changes:
  12  * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
  13  * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
  14  * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
  15  *
  16  * JHS: We should remove the CONFIG_NET_CLS_IND from here
  17  * eventually when the meta match extension is made available
  18  *
  19  */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/system.h>
  25 #include <linux/bitops.h>
  26 #include <linux/types.h>
  27 #include <linux/kernel.h>
  28 #include <linux/sched.h>
  29 #include <linux/string.h>
  30 #include <linux/mm.h>
  31 #include <linux/socket.h>
  32 #include <linux/sockios.h>
  33 #include <linux/in.h>
  34 #include <linux/errno.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/if_ether.h>
  37 #include <linux/inet.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/etherdevice.h>
  40 #include <linux/notifier.h>
  41 #include <linux/netfilter.h>
  42 #include <net/ip.h>
  43 #include <net/route.h>
  44 #include <linux/skbuff.h>
  45 #include <net/sock.h>
  46 #include <net/act_api.h>
  47 #include <net/pkt_cls.h>
  48
  49 struct fw_head
  50 {
  51         struct fw_filter *ht[256];
  52 };
  53
  54 struct fw_filter
  55 {
  56         struct fw_filter        *next;
  57         u32                     id;
  58         struct tcf_result       res;
  59 #ifdef CONFIG_NET_CLS_IND
  60         char                    indev[IFNAMSIZ];
  61 #endif /* CONFIG_NET_CLS_IND */
  62 #ifdef CONFIG_NET_CLS_ACT
  63         struct tc_action        *action;
  64 #else /* CONFIG_NET_CLS_ACT */
  65 #ifdef CONFIG_NET_CLS_POLICE
  66         struct tcf_police       *police;
  67 #endif /* CONFIG_NET_CLS_POLICE */
  68 #endif /* CONFIG_NET_CLS_ACT */
  69 };
  70
  71 static __inline__ int fw_hash(u32 handle)
  72 {
  73         return handle&0xFF;
  74 }
  75
  76 static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp,
  77                           struct tcf_result *res)
  78 {
  79         struct fw_head *head = (struct fw_head*)tp->root;
  80         struct fw_filter *f;
  81 #ifdef CONFIG_NETFILTER
  82         u32 id = skb->nfmark;
  83 #else
  84         u32 id = 0;
  85 #endif
  86
  87         if (head != NULL) {
  88                 for (f=head->ht[fw_hash(id)]; f; f=f->next) {
  89                         if (f->id == id) {
  90                                 *res = f->res;
  91 #ifdef CONFIG_NET_CLS_IND
  92                                 if (!tcf_match_indev(skb, f->indev))
  93                                         continue;
  94 #endif /* CONFIG_NET_CLS_IND */
  95 #ifdef CONFIG_NET_CLS_ACT
  96                                 if (f->action) {
  97                                         int act_res = tcf_action_exec(skb, f->action, res);
  98                                         if (act_res >= 0)
  99                                                 return act_res;
 100                                         continue;
 101                                 }
 102 #else /* CONFIG_NET_CLS_ACT */
 103 #ifdef CONFIG_NET_CLS_POLICE
 104                                 if (f->police)
 105                                         return tcf_police(skb, f->police);
 106 #endif /* CONFIG_NET_CLS_POLICE */
 107 #endif /* CONFIG_NET_CLS_ACT */
 108                                 return 0;
 109                         }
 110                 }
 111         } else {
 112                 /* old method */
 113                 if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) {
 114                         res->classid = id;
 115                         res->class = 0;
 116                         return 0;
 117                 }
 118         }
 119
 120         return -1;
 121 }
 122
 123 static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
 124 {
 125         struct fw_head *head = (struct fw_head*)tp->root;
 126         struct fw_filter *f;
 127
 128         if (head == NULL)
 129                 return 0;
 130
 131         for (f=head->ht[fw_hash(handle)]; f; f=f->next) {
 132                 if (f->id == handle)
 133                         return (unsigned long)f;
 134         }
 135         return 0;
 136 }
 137
 138 static void fw_put(struct tcf_proto *tp, unsigned long f)
 139 {
 140 }
 141
 142 static int fw_init(struct tcf_proto *tp)
 143 {
 144         return 0;
 145 }
 146
 147 static void fw_destroy(struct tcf_proto *tp)
 148 {
 149         struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL);
 150         struct fw_filter *f;
 151         int h;
 152
 153         if (head == NULL)
 154                 return;
 155
 156         for (h=0; h<256; h++) {
 157                 while ((f=head->ht[h]) != NULL) {
 158                         head->ht[h] = f->next;
 159                         tcf_unbind_filter(tp, &f->res);
 160 #ifdef CONFIG_NET_CLS_ACT
 161                         if (f->action)
 162                                 tcf_action_destroy(f->action, TCA_ACT_UNBIND);
 163 #else /* CONFIG_NET_CLS_ACT */
 164 #ifdef CONFIG_NET_CLS_POLICE
 165                         if (f->police)
 166                                 tcf_police_release(f->police, TCA_ACT_UNBIND);
 167 #endif /* CONFIG_NET_CLS_POLICE */
 168 #endif /* CONFIG_NET_CLS_ACT */
 169
 170                         kfree(f);
 171                 }
 172         }
 173         kfree(head);
 174 }
 175
 176 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
 177 {
 178         struct fw_head *head = (struct fw_head*)tp->root;
 179         struct fw_filter *f = (struct fw_filter*)arg;
 180         struct fw_filter **fp;
 181
 182         if (head == NULL || f == NULL)
 183                 goto out;
 184
 185         for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
 186                 if (*fp == f) {
 187                         tcf_tree_lock(tp);
 188                         *fp = f->next;
 189                         tcf_tree_unlock(tp);
 190                         tcf_unbind_filter(tp, &f->res);
 191 #ifdef CONFIG_NET_CLS_ACT
 192                         if (f->action)
 193                                 tcf_action_destroy(f->action,TCA_ACT_UNBIND);
 194 #else /* CONFIG_NET_CLS_ACT */
 195 #ifdef CONFIG_NET_CLS_POLICE
 196                         tcf_police_release(f->police,TCA_ACT_UNBIND);
 197 #endif /* CONFIG_NET_CLS_POLICE */
 198 #endif /* CONFIG_NET_CLS_ACT */
 199                         kfree(f);
 200                         return 0;
 201                 }
 202         }
 203 out:
 204         return -EINVAL;
 205 }
 206
 207 static int
 208 fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
 209         struct rtattr **tb, struct rtattr **tca, unsigned long base)
 210 {
 211         int err = -EINVAL;
 212
 213         if (tb[TCA_FW_CLASSID-1]) {
 214                 if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32))
 215                         goto errout;
 216                 f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]);
 217                 tcf_bind_filter(tp, &f->res, base);
 218         }
 219
 220 #ifdef CONFIG_NET_CLS_IND
 221         if (tb[TCA_FW_INDEV-1]) {
 222                 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]);
 223                 if (err < 0)
 224                         goto errout;
 225         }
 226 #endif /* CONFIG_NET_CLS_IND */
 227
 228 #ifdef CONFIG_NET_CLS_ACT
 229         if (tb[TCA_FW_POLICE-1]) {
 230                 err = tcf_change_act_police(tp, &f->action, tb[TCA_FW_POLICE-1],
 231                         tca[TCA_RATE-1]);
 232                 if (err < 0)
 233                         goto errout;
 234         }
 235
 236         if (tb[TCA_FW_ACT-1]) {
 237                 err = tcf_change_act(tp, &f->action, tb[TCA_FW_ACT-1],
 238                         tca[TCA_RATE-1]);
 239                 if (err < 0)
 240                         goto errout;
 241         }
 242 #else /* CONFIG_NET_CLS_ACT */
 243 #ifdef CONFIG_NET_CLS_POLICE
 244         if (tb[TCA_FW_POLICE-1]) {
 245                 err = tcf_change_police(tp, &f->police, tb[TCA_FW_POLICE-1],
 246                         tca[TCA_RATE-1]);
 247                 if (err < 0)
 248                         goto errout;
 249         }
 250 #endif /* CONFIG_NET_CLS_POLICE */
 251 #endif /* CONFIG_NET_CLS_ACT */
 252
 253         err = 0;
 254 errout:
 255         return err;
 256 }
 257
 258 static int fw_change(struct tcf_proto *tp, unsigned long base,
 259                      u32 handle,
 260                      struct rtattr **tca,
 261                      unsigned long *arg)
 262 {
 263         struct fw_head *head = (struct fw_head*)tp->root;
 264         struct fw_filter *f = (struct fw_filter *) *arg;
 265         struct rtattr *opt = tca[TCA_OPTIONS-1];
 266         struct rtattr *tb[TCA_FW_MAX];
 267         int err;
 268
 269         if (!opt)
 270                 return handle ? -EINVAL : 0;
 271
 272         if (rtattr_parse(tb, TCA_FW_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0)
 273                 return -EINVAL;
 274
 275         if (f != NULL) {
 276                 if (f->id != handle && handle)
 277                         return -EINVAL;
 278                 return fw_change_attrs(tp, f, tb, tca, base);
 279         }
 280
 281         if (!handle)
 282                 return -EINVAL;
 283
 284         if (head == NULL) {
 285                 head = kmalloc(sizeof(struct fw_head), GFP_KERNEL);
 286                 if (head == NULL)
 287                         return -ENOBUFS;
 288                 memset(head, 0, sizeof(*head));
 289
 290                 tcf_tree_lock(tp);
 291                 tp->root = head;
 292                 tcf_tree_unlock(tp);
 293         }
 294
 295         f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL);
 296         if (f == NULL)
 297                 return -ENOBUFS;
 298         memset(f, 0, sizeof(*f));
 299
 300         f->id = handle;
 301
 302         err = fw_change_attrs(tp, f, tb, tca, base);
 303         if (err < 0)
 304                 goto errout;
 305
 306         f->next = head->ht[fw_hash(handle)];
 307         tcf_tree_lock(tp);
 308         head->ht[fw_hash(handle)] = f;
 309         tcf_tree_unlock(tp);
 310
 311         *arg = (unsigned long)f;
 312         return 0;
 313
 314 errout:
 315         if (f)
 316                 kfree(f);
 317         return err;
 318 }
 319
 320 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 321 {
 322         struct fw_head *head = (struct fw_head*)tp->root;
 323         int h;
 324
 325         if (head == NULL)
 326                 arg->stop = 1;
 327
 328         if (arg->stop)
 329                 return;
 330
 331         for (h = 0; h < 256; h++) {
 332                 struct fw_filter *f;
 333
 334                 for (f = head->ht[h]; f; f = f->next) {
 335                         if (arg->count < arg->skip) {
 336                                 arg->count++;
 337                                 continue;
 338                         }
 339                         if (arg->fn(tp, (unsigned long)f, arg) < 0) {
 340                                 arg->stop = 1;
 341                                 return;
 342                         }
 343                         arg->count++;
 344                 }
 345         }
 346 }
 347
 348 static int fw_dump(struct tcf_proto *tp, unsigned long fh,
 349                    struct sk_buff *skb, struct tcmsg *t)
 350 {
 351         struct fw_filter *f = (struct fw_filter*)fh;
 352         unsigned char    *b = skb->tail;
 353         struct rtattr *rta;
 354
 355         if (f == NULL)
 356                 return skb->len;
 357
 358         t->tcm_handle = f->id;
 359
 360         if (!f->res.classid
 361 #ifdef CONFIG_NET_CLS_ACT
 362                 && !f->action
 363 #else
 364 #ifdef CONFIG_NET_CLS_POLICE
 365                 && !f->police
 366 #endif
 367 #endif
 368                 )
 369                 return skb->len;
 370
 371         rta = (struct rtattr*)b;
 372         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 373
 374         if (f->res.classid)
 375                 RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid);
 376 #ifdef CONFIG_NET_CLS_IND
 377         if (strlen(f->indev))
 378                 RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
 379 #endif /* CONFIG_NET_CLS_IND */
 380 #ifdef CONFIG_NET_CLS_ACT
 381         if (tcf_dump_act(skb, f->action, TCA_FW_ACT, TCA_FW_POLICE) < 0)
 382                 goto rtattr_failure;
 383 #else /* CONFIG_NET_CLS_ACT */
 384 #ifdef CONFIG_NET_CLS_POLICE
 385         if (tcf_dump_police(skb, f->police, TCA_FW_POLICE) < 0)
 386                 goto rtattr_failure;
 387 #endif /* CONFIG_NET_CLS_POLICE */
 388 #endif /* CONFIG_NET_CLS_ACT */
 389
 390         rta->rta_len = skb->tail - b;
 391 #ifdef CONFIG_NET_CLS_ACT
 392         if (f->action && f->action->type == TCA_OLD_COMPAT) {
 393                 if (tcf_action_copy_stats(skb,f->action))
 394                         goto rtattr_failure;
 395         }
 396 #else /* CONFIG_NET_CLS_ACT */
 397 #ifdef CONFIG_NET_CLS_POLICE
 398         if (f->police)
 399                 if (tcf_police_dump_stats(skb, f->police) < 0)
 400                         goto rtattr_failure;
 401 #endif /* CONFIG_NET_CLS_POLICE */
 402 #endif /* CONFIG_NET_CLS_ACT */
 403         return skb->len;
 404
 405 rtattr_failure:
 406         skb_trim(skb, b - skb->data);
 407         return -1;
 408 }
 409
 410 static struct tcf_proto_ops cls_fw_ops = {
 411         .next           =       NULL,
 412         .kind           =       "fw",
 413         .classify       =       fw_classify,
 414         .init           =       fw_init,
 415         .destroy        =       fw_destroy,
 416         .get            =       fw_get,
 417         .put            =       fw_put,
 418         .change         =       fw_change,
 419         .delete         =       fw_delete,
 420         .walk           =       fw_walk,
 421         .dump           =       fw_dump,
 422         .owner          =       THIS_MODULE,
 423 };
 424
 425 static int __init init_fw(void)
 426 {
 427         return register_tcf_proto_ops(&cls_fw_ops);
 428 }
 429
 430 static void __exit exit_fw(void)
 431 {
 432         unregister_tcf_proto_ops(&cls_fw_ops);
 433 }
 434
 435 module_init(init_fw)
 436 module_exit(exit_fw)
 437 MODULE_LICENSE("GPL");