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   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/module.h>
  22 #include <linux/types.h>
  23 #include <linux/kernel.h>
  24 #include <linux/string.h>
  25 #include <linux/errno.h>
  26 #include <linux/skbuff.h>
  27 #include <net/netlink.h>
  28 #include <net/act_api.h>
  29 #include <net/pkt_cls.h>
  30
  31 #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
  32
  33 struct fw_head
  34 {
  35         struct fw_filter *ht[HTSIZE];
  36         u32 mask;
  37 };
  38
  39 struct fw_filter
  40 {
  41         struct fw_filter        *next;
  42         u32                     id;
  43         struct tcf_result       res;
  44 #ifdef CONFIG_NET_CLS_IND
  45         char                    indev[IFNAMSIZ];
  46 #endif /* CONFIG_NET_CLS_IND */
  47         struct tcf_exts         exts;
  48 };
  49
  50 static struct tcf_ext_map fw_ext_map = {
  51         .action = TCA_FW_ACT,
  52         .police = TCA_FW_POLICE
  53 };
  54
  55 static __inline__ int fw_hash(u32 handle)
  56 {
  57         if (HTSIZE == 4096)
  58                 return ((handle >> 24) & 0xFFF) ^
  59                        ((handle >> 12) & 0xFFF) ^
  60                        (handle & 0xFFF);
  61         else if (HTSIZE == 2048)
  62                 return ((handle >> 22) & 0x7FF) ^
  63                        ((handle >> 11) & 0x7FF) ^
  64                        (handle & 0x7FF);
  65         else if (HTSIZE == 1024)
  66                 return ((handle >> 20) & 0x3FF) ^
  67                        ((handle >> 10) & 0x3FF) ^
  68                        (handle & 0x3FF);
  69         else if (HTSIZE == 512)
  70                 return (handle >> 27) ^
  71                        ((handle >> 18) & 0x1FF) ^
  72                        ((handle >> 9) & 0x1FF) ^
  73                        (handle & 0x1FF);
  74         else if (HTSIZE == 256) {
  75                 u8 *t = (u8 *) &handle;
  76                 return t[0] ^ t[1] ^ t[2] ^ t[3];
  77         } else
  78                 return handle & (HTSIZE - 1);
  79 }
  80
  81 static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp,
  82                           struct tcf_result *res)
  83 {
  84         struct fw_head *head = (struct fw_head*)tp->root;
  85         struct fw_filter *f;
  86         int r;
  87         u32 id = skb->mark;
  88
  89         if (head != NULL) {
  90                 id &= head->mask;
  91                 for (f=head->ht[fw_hash(id)]; f; f=f->next) {
  92                         if (f->id == id) {
  93                                 *res = f->res;
  94 #ifdef CONFIG_NET_CLS_IND
  95                                 if (!tcf_match_indev(skb, f->indev))
  96                                         continue;
  97 #endif /* CONFIG_NET_CLS_IND */
  98                                 r = tcf_exts_exec(skb, &f->exts, res);
  99                                 if (r < 0)
 100                                         continue;
 101
 102                                 return r;
 103                         }
 104                 }
 105         } else {
 106                 /* old method */
 107                 if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) {
 108                         res->classid = id;
 109                         res->class = 0;
 110                         return 0;
 111                 }
 112         }
 113
 114         return -1;
 115 }
 116
 117 static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
 118 {
 119         struct fw_head *head = (struct fw_head*)tp->root;
 120         struct fw_filter *f;
 121
 122         if (head == NULL)
 123                 return 0;
 124
 125         for (f=head->ht[fw_hash(handle)]; f; f=f->next) {
 126                 if (f->id == handle)
 127                         return (unsigned long)f;
 128         }
 129         return 0;
 130 }
 131
 132 static void fw_put(struct tcf_proto *tp, unsigned long f)
 133 {
 134 }
 135
 136 static int fw_init(struct tcf_proto *tp)
 137 {
 138         return 0;
 139 }
 140
 141 static inline void
 142 fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
 143 {
 144         tcf_unbind_filter(tp, &f->res);
 145         tcf_exts_destroy(tp, &f->exts);
 146         kfree(f);
 147 }
 148
 149 static void fw_destroy(struct tcf_proto *tp)
 150 {
 151         struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL);
 152         struct fw_filter *f;
 153         int h;
 154
 155         if (head == NULL)
 156                 return;
 157
 158         for (h=0; h<HTSIZE; h++) {
 159                 while ((f=head->ht[h]) != NULL) {
 160                         head->ht[h] = f->next;
 161                         fw_delete_filter(tp, f);
 162                 }
 163         }
 164         kfree(head);
 165 }
 166
 167 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
 168 {
 169         struct fw_head *head = (struct fw_head*)tp->root;
 170         struct fw_filter *f = (struct fw_filter*)arg;
 171         struct fw_filter **fp;
 172
 173         if (head == NULL || f == NULL)
 174                 goto out;
 175
 176         for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
 177                 if (*fp == f) {
 178                         tcf_tree_lock(tp);
 179                         *fp = f->next;
 180                         tcf_tree_unlock(tp);
 181                         fw_delete_filter(tp, f);
 182                         return 0;
 183                 }
 184         }
 185 out:
 186         return -EINVAL;
 187 }
 188
 189 static int
 190 fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
 191         struct nlattr **tb, struct nlattr **tca, unsigned long base)
 192 {
 193         struct fw_head *head = (struct fw_head *)tp->root;
 194         struct tcf_exts e;
 195         u32 mask;
 196         int err;
 197
 198         err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
 199         if (err < 0)
 200                 return err;
 201
 202         err = -EINVAL;
 203         if (tb[TCA_FW_CLASSID]) {
 204                 if (nla_len(tb[TCA_FW_CLASSID]) != sizeof(u32))
 205                         goto errout;
 206                 f->res.classid = *(u32*)nla_data(tb[TCA_FW_CLASSID]);
 207                 tcf_bind_filter(tp, &f->res, base);
 208         }
 209
 210 #ifdef CONFIG_NET_CLS_IND
 211         if (tb[TCA_FW_INDEV]) {
 212                 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
 213                 if (err < 0)
 214                         goto errout;
 215         }
 216 #endif /* CONFIG_NET_CLS_IND */
 217
 218         if (tb[TCA_FW_MASK]) {
 219                 if (nla_len(tb[TCA_FW_MASK]) != sizeof(u32))
 220                         goto errout;
 221                 mask = *(u32*)nla_data(tb[TCA_FW_MASK]);
 222                 if (mask != head->mask)
 223                         goto errout;
 224         } else if (head->mask != 0xFFFFFFFF)
 225                 goto errout;
 226
 227         tcf_exts_change(tp, &f->exts, &e);
 228
 229         return 0;
 230 errout:
 231         tcf_exts_destroy(tp, &e);
 232         return err;
 233 }
 234
 235 static int fw_change(struct tcf_proto *tp, unsigned long base,
 236                      u32 handle,
 237                      struct nlattr **tca,
 238                      unsigned long *arg)
 239 {
 240         struct fw_head *head = (struct fw_head*)tp->root;
 241         struct fw_filter *f = (struct fw_filter *) *arg;
 242         struct nlattr *opt = tca[TCA_OPTIONS];
 243         struct nlattr *tb[TCA_FW_MAX + 1];
 244         int err;
 245
 246         if (!opt)
 247                 return handle ? -EINVAL : 0;
 248
 249         err = nla_parse_nested(tb, TCA_FW_MAX, opt, NULL);
 250         if (err < 0)
 251                 return err;
 252
 253         if (f != NULL) {
 254                 if (f->id != handle && handle)
 255                         return -EINVAL;
 256                 return fw_change_attrs(tp, f, tb, tca, base);
 257         }
 258
 259         if (!handle)
 260                 return -EINVAL;
 261
 262         if (head == NULL) {
 263                 u32 mask = 0xFFFFFFFF;
 264                 if (tb[TCA_FW_MASK]) {
 265                         if (nla_len(tb[TCA_FW_MASK]) != sizeof(u32))
 266                                 return -EINVAL;
 267                         mask = *(u32*)nla_data(tb[TCA_FW_MASK]);
 268                 }
 269
 270                 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
 271                 if (head == NULL)
 272                         return -ENOBUFS;
 273                 head->mask = mask;
 274
 275                 tcf_tree_lock(tp);
 276                 tp->root = head;
 277                 tcf_tree_unlock(tp);
 278         }
 279
 280         f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
 281         if (f == NULL)
 282                 return -ENOBUFS;
 283
 284         f->id = handle;
 285
 286         err = fw_change_attrs(tp, f, tb, tca, base);
 287         if (err < 0)
 288                 goto errout;
 289
 290         f->next = head->ht[fw_hash(handle)];
 291         tcf_tree_lock(tp);
 292         head->ht[fw_hash(handle)] = f;
 293         tcf_tree_unlock(tp);
 294
 295         *arg = (unsigned long)f;
 296         return 0;
 297
 298 errout:
 299         kfree(f);
 300         return err;
 301 }
 302
 303 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 304 {
 305         struct fw_head *head = (struct fw_head*)tp->root;
 306         int h;
 307
 308         if (head == NULL)
 309                 arg->stop = 1;
 310
 311         if (arg->stop)
 312                 return;
 313
 314         for (h = 0; h < HTSIZE; h++) {
 315                 struct fw_filter *f;
 316
 317                 for (f = head->ht[h]; f; f = f->next) {
 318                         if (arg->count < arg->skip) {
 319                                 arg->count++;
 320                                 continue;
 321                         }
 322                         if (arg->fn(tp, (unsigned long)f, arg) < 0) {
 323                                 arg->stop = 1;
 324                                 return;
 325                         }
 326                         arg->count++;
 327                 }
 328         }
 329 }
 330
 331 static int fw_dump(struct tcf_proto *tp, unsigned long fh,
 332                    struct sk_buff *skb, struct tcmsg *t)
 333 {
 334         struct fw_head *head = (struct fw_head *)tp->root;
 335         struct fw_filter *f = (struct fw_filter*)fh;
 336         unsigned char *b = skb_tail_pointer(skb);
 337         struct nlattr *nest;
 338
 339         if (f == NULL)
 340                 return skb->len;
 341
 342         t->tcm_handle = f->id;
 343
 344         if (!f->res.classid && !tcf_exts_is_available(&f->exts))
 345                 return skb->len;
 346
 347         nest = nla_nest_start(skb, TCA_OPTIONS);
 348         if (nest == NULL)
 349                 goto nla_put_failure;
 350
 351         if (f->res.classid)
 352                 NLA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid);
 353 #ifdef CONFIG_NET_CLS_IND
 354         if (strlen(f->indev))
 355                 NLA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
 356 #endif /* CONFIG_NET_CLS_IND */
 357         if (head->mask != 0xFFFFFFFF)
 358                 NLA_PUT(skb, TCA_FW_MASK, 4, &head->mask);
 359
 360         if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
 361                 goto nla_put_failure;
 362
 363         nla_nest_end(skb, nest);
 364
 365         if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
 366                 goto nla_put_failure;
 367
 368         return skb->len;
 369
 370 nla_put_failure:
 371         nlmsg_trim(skb, b);
 372         return -1;
 373 }
 374
 375 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
 376         .kind           =       "fw",
 377         .classify       =       fw_classify,
 378         .init           =       fw_init,
 379         .destroy        =       fw_destroy,
 380         .get            =       fw_get,
 381         .put            =       fw_put,
 382         .change         =       fw_change,
 383         .delete         =       fw_delete,
 384         .walk           =       fw_walk,
 385         .dump           =       fw_dump,
 386         .owner          =       THIS_MODULE,
 387 };
 388
 389 static int __init init_fw(void)
 390 {
 391         return register_tcf_proto_ops(&cls_fw_ops);
 392 }
 393
 394 static void __exit exit_fw(void)
 395 {
 396         unregister_tcf_proto_ops(&cls_fw_ops);
 397 }
 398
 399 module_init(init_fw)
 400 module_exit(exit_fw)
 401 MODULE_LICENSE("GPL");