Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <asm/uaccess.h> |
| 23 | #include <asm/system.h> |
| 24 | #include <linux/bitops.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/socket.h> |
| 31 | #include <linux/sockios.h> |
| 32 | #include <linux/in.h> |
| 33 | #include <linux/errno.h> |
| 34 | #include <linux/interrupt.h> |
| 35 | #include <linux/if_ether.h> |
| 36 | #include <linux/inet.h> |
| 37 | #include <linux/netdevice.h> |
| 38 | #include <linux/etherdevice.h> |
| 39 | #include <linux/notifier.h> |
| 40 | #include <linux/netfilter.h> |
| 41 | #include <net/ip.h> |
| 42 | #include <net/route.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | #include <net/sock.h> |
| 45 | #include <net/act_api.h> |
| 46 | #include <net/pkt_cls.h> |
| 47 | |
Thomas Graf | c5c13fa | 2005-04-24 20:19:54 -0700 | [diff] [blame] | 48 | #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *)) |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | struct fw_head |
| 51 | { |
Thomas Graf | c5c13fa | 2005-04-24 20:19:54 -0700 | [diff] [blame] | 52 | struct fw_filter *ht[HTSIZE]; |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 53 | u32 mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | }; |
| 55 | |
| 56 | struct fw_filter |
| 57 | { |
| 58 | struct fw_filter *next; |
| 59 | u32 id; |
| 60 | struct tcf_result res; |
| 61 | #ifdef CONFIG_NET_CLS_IND |
| 62 | char indev[IFNAMSIZ]; |
| 63 | #endif /* CONFIG_NET_CLS_IND */ |
| 64 | struct tcf_exts exts; |
| 65 | }; |
| 66 | |
| 67 | static struct tcf_ext_map fw_ext_map = { |
| 68 | .action = TCA_FW_ACT, |
| 69 | .police = TCA_FW_POLICE |
| 70 | }; |
| 71 | |
| 72 | static __inline__ int fw_hash(u32 handle) |
| 73 | { |
Thomas Graf | c5c13fa | 2005-04-24 20:19:54 -0700 | [diff] [blame] | 74 | if (HTSIZE == 4096) |
| 75 | return ((handle >> 24) & 0xFFF) ^ |
| 76 | ((handle >> 12) & 0xFFF) ^ |
| 77 | (handle & 0xFFF); |
| 78 | else if (HTSIZE == 2048) |
| 79 | return ((handle >> 22) & 0x7FF) ^ |
| 80 | ((handle >> 11) & 0x7FF) ^ |
| 81 | (handle & 0x7FF); |
| 82 | else if (HTSIZE == 1024) |
| 83 | return ((handle >> 20) & 0x3FF) ^ |
| 84 | ((handle >> 10) & 0x3FF) ^ |
| 85 | (handle & 0x3FF); |
| 86 | else if (HTSIZE == 512) |
| 87 | return (handle >> 27) ^ |
| 88 | ((handle >> 18) & 0x1FF) ^ |
| 89 | ((handle >> 9) & 0x1FF) ^ |
| 90 | (handle & 0x1FF); |
| 91 | else if (HTSIZE == 256) { |
| 92 | u8 *t = (u8 *) &handle; |
| 93 | return t[0] ^ t[1] ^ t[2] ^ t[3]; |
| 94 | } else |
| 95 | return handle & (HTSIZE - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp, |
| 99 | struct tcf_result *res) |
| 100 | { |
| 101 | struct fw_head *head = (struct fw_head*)tp->root; |
| 102 | struct fw_filter *f; |
| 103 | int r; |
Patrick McHardy | 5c804bf | 2006-12-05 13:46:13 -0800 | [diff] [blame^] | 104 | u32 id = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | if (head != NULL) { |
Patrick McHardy | 5c804bf | 2006-12-05 13:46:13 -0800 | [diff] [blame^] | 107 | id &= head->mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | for (f=head->ht[fw_hash(id)]; f; f=f->next) { |
| 109 | if (f->id == id) { |
| 110 | *res = f->res; |
| 111 | #ifdef CONFIG_NET_CLS_IND |
| 112 | if (!tcf_match_indev(skb, f->indev)) |
| 113 | continue; |
| 114 | #endif /* CONFIG_NET_CLS_IND */ |
| 115 | r = tcf_exts_exec(skb, &f->exts, res); |
| 116 | if (r < 0) |
| 117 | continue; |
| 118 | |
| 119 | return r; |
| 120 | } |
| 121 | } |
| 122 | } else { |
| 123 | /* old method */ |
| 124 | if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) { |
| 125 | res->classid = id; |
| 126 | res->class = 0; |
| 127 | return 0; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | return -1; |
| 132 | } |
| 133 | |
| 134 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) |
| 135 | { |
| 136 | struct fw_head *head = (struct fw_head*)tp->root; |
| 137 | struct fw_filter *f; |
| 138 | |
| 139 | if (head == NULL) |
| 140 | return 0; |
| 141 | |
| 142 | for (f=head->ht[fw_hash(handle)]; f; f=f->next) { |
| 143 | if (f->id == handle) |
| 144 | return (unsigned long)f; |
| 145 | } |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static void fw_put(struct tcf_proto *tp, unsigned long f) |
| 150 | { |
| 151 | } |
| 152 | |
| 153 | static int fw_init(struct tcf_proto *tp) |
| 154 | { |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static inline void |
| 159 | fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) |
| 160 | { |
| 161 | tcf_unbind_filter(tp, &f->res); |
| 162 | tcf_exts_destroy(tp, &f->exts); |
| 163 | kfree(f); |
| 164 | } |
| 165 | |
| 166 | static void fw_destroy(struct tcf_proto *tp) |
| 167 | { |
| 168 | struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL); |
| 169 | struct fw_filter *f; |
| 170 | int h; |
| 171 | |
| 172 | if (head == NULL) |
| 173 | return; |
| 174 | |
Thomas Graf | c5c13fa | 2005-04-24 20:19:54 -0700 | [diff] [blame] | 175 | for (h=0; h<HTSIZE; h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | while ((f=head->ht[h]) != NULL) { |
| 177 | head->ht[h] = f->next; |
| 178 | fw_delete_filter(tp, f); |
| 179 | } |
| 180 | } |
| 181 | kfree(head); |
| 182 | } |
| 183 | |
| 184 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) |
| 185 | { |
| 186 | struct fw_head *head = (struct fw_head*)tp->root; |
| 187 | struct fw_filter *f = (struct fw_filter*)arg; |
| 188 | struct fw_filter **fp; |
| 189 | |
| 190 | if (head == NULL || f == NULL) |
| 191 | goto out; |
| 192 | |
| 193 | for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { |
| 194 | if (*fp == f) { |
| 195 | tcf_tree_lock(tp); |
| 196 | *fp = f->next; |
| 197 | tcf_tree_unlock(tp); |
| 198 | fw_delete_filter(tp, f); |
| 199 | return 0; |
| 200 | } |
| 201 | } |
| 202 | out: |
| 203 | return -EINVAL; |
| 204 | } |
| 205 | |
| 206 | static int |
| 207 | fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f, |
| 208 | struct rtattr **tb, struct rtattr **tca, unsigned long base) |
| 209 | { |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 210 | struct fw_head *head = (struct fw_head *)tp->root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | struct tcf_exts e; |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 212 | u32 mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | int err; |
| 214 | |
| 215 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map); |
| 216 | if (err < 0) |
| 217 | return err; |
| 218 | |
| 219 | err = -EINVAL; |
| 220 | if (tb[TCA_FW_CLASSID-1]) { |
| 221 | if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32)) |
| 222 | goto errout; |
| 223 | f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); |
| 224 | tcf_bind_filter(tp, &f->res, base); |
| 225 | } |
| 226 | |
| 227 | #ifdef CONFIG_NET_CLS_IND |
| 228 | if (tb[TCA_FW_INDEV-1]) { |
| 229 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]); |
| 230 | if (err < 0) |
| 231 | goto errout; |
| 232 | } |
| 233 | #endif /* CONFIG_NET_CLS_IND */ |
| 234 | |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 235 | if (tb[TCA_FW_MASK-1]) { |
| 236 | if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32)) |
| 237 | goto errout; |
| 238 | mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]); |
| 239 | if (mask != head->mask) |
| 240 | goto errout; |
| 241 | } else if (head->mask != 0xFFFFFFFF) |
| 242 | goto errout; |
| 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | tcf_exts_change(tp, &f->exts, &e); |
| 245 | |
| 246 | return 0; |
| 247 | errout: |
| 248 | tcf_exts_destroy(tp, &e); |
| 249 | return err; |
| 250 | } |
| 251 | |
| 252 | static int fw_change(struct tcf_proto *tp, unsigned long base, |
| 253 | u32 handle, |
| 254 | struct rtattr **tca, |
| 255 | unsigned long *arg) |
| 256 | { |
| 257 | struct fw_head *head = (struct fw_head*)tp->root; |
| 258 | struct fw_filter *f = (struct fw_filter *) *arg; |
| 259 | struct rtattr *opt = tca[TCA_OPTIONS-1]; |
| 260 | struct rtattr *tb[TCA_FW_MAX]; |
| 261 | int err; |
| 262 | |
| 263 | if (!opt) |
| 264 | return handle ? -EINVAL : 0; |
| 265 | |
| 266 | if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0) |
| 267 | return -EINVAL; |
| 268 | |
| 269 | if (f != NULL) { |
| 270 | if (f->id != handle && handle) |
| 271 | return -EINVAL; |
| 272 | return fw_change_attrs(tp, f, tb, tca, base); |
| 273 | } |
| 274 | |
| 275 | if (!handle) |
| 276 | return -EINVAL; |
| 277 | |
| 278 | if (head == NULL) { |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 279 | u32 mask = 0xFFFFFFFF; |
| 280 | if (tb[TCA_FW_MASK-1]) { |
| 281 | if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32)) |
| 282 | return -EINVAL; |
| 283 | mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]); |
| 284 | } |
| 285 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 286 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | if (head == NULL) |
| 288 | return -ENOBUFS; |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 289 | head->mask = mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | tcf_tree_lock(tp); |
| 292 | tp->root = head; |
| 293 | tcf_tree_unlock(tp); |
| 294 | } |
| 295 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 296 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (f == NULL) |
| 298 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 315 | kfree(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | return err; |
| 317 | } |
| 318 | |
| 319 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
| 320 | { |
| 321 | struct fw_head *head = (struct fw_head*)tp->root; |
| 322 | int h; |
| 323 | |
| 324 | if (head == NULL) |
| 325 | arg->stop = 1; |
| 326 | |
| 327 | if (arg->stop) |
| 328 | return; |
| 329 | |
Thomas Graf | c5c13fa | 2005-04-24 20:19:54 -0700 | [diff] [blame] | 330 | for (h = 0; h < HTSIZE; h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct fw_filter *f; |
| 332 | |
| 333 | for (f = head->ht[h]; f; f = f->next) { |
| 334 | if (arg->count < arg->skip) { |
| 335 | arg->count++; |
| 336 | continue; |
| 337 | } |
| 338 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { |
| 339 | arg->stop = 1; |
| 340 | return; |
| 341 | } |
| 342 | arg->count++; |
| 343 | } |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, |
| 348 | struct sk_buff *skb, struct tcmsg *t) |
| 349 | { |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 350 | struct fw_head *head = (struct fw_head *)tp->root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 && !tcf_exts_is_available(&f->exts)) |
| 361 | return skb->len; |
| 362 | |
| 363 | rta = (struct rtattr*)b; |
| 364 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
| 365 | |
| 366 | if (f->res.classid) |
| 367 | RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid); |
| 368 | #ifdef CONFIG_NET_CLS_IND |
| 369 | if (strlen(f->indev)) |
| 370 | RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev); |
| 371 | #endif /* CONFIG_NET_CLS_IND */ |
Patrick McHardy | b4e9b52 | 2006-08-25 16:11:42 -0700 | [diff] [blame] | 372 | if (head->mask != 0xFFFFFFFF) |
| 373 | RTA_PUT(skb, TCA_FW_MASK, 4, &head->mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0) |
| 376 | goto rtattr_failure; |
| 377 | |
| 378 | rta->rta_len = skb->tail - b; |
| 379 | |
| 380 | if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0) |
| 381 | goto rtattr_failure; |
| 382 | |
| 383 | return skb->len; |
| 384 | |
| 385 | rtattr_failure: |
| 386 | skb_trim(skb, b - skb->data); |
| 387 | return -1; |
| 388 | } |
| 389 | |
| 390 | static struct tcf_proto_ops cls_fw_ops = { |
| 391 | .next = NULL, |
| 392 | .kind = "fw", |
| 393 | .classify = fw_classify, |
| 394 | .init = fw_init, |
| 395 | .destroy = fw_destroy, |
| 396 | .get = fw_get, |
| 397 | .put = fw_put, |
| 398 | .change = fw_change, |
| 399 | .delete = fw_delete, |
| 400 | .walk = fw_walk, |
| 401 | .dump = fw_dump, |
| 402 | .owner = THIS_MODULE, |
| 403 | }; |
| 404 | |
| 405 | static int __init init_fw(void) |
| 406 | { |
| 407 | return register_tcf_proto_ops(&cls_fw_ops); |
| 408 | } |
| 409 | |
| 410 | static void __exit exit_fw(void) |
| 411 | { |
| 412 | unregister_tcf_proto_ops(&cls_fw_ops); |
| 413 | } |
| 414 | |
| 415 | module_init(init_fw) |
| 416 | module_exit(exit_fw) |
| 417 | MODULE_LICENSE("GPL"); |