blob: c10d57bf98f2aa036434633db10a03fa530688da [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/cls_route.c ROUTE4 classifier.
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
12#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/types.h>
15#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/skbuff.h>
Patrick McHardy0ba48052007-07-02 22:49:07 -070019#include <net/dst.h>
20#include <net/route.h>
21#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/act_api.h>
23#include <net/pkt_cls.h>
24
25/*
Eric Dumazetcc7ec452011-01-19 19:26:56 +000026 * 1. For now we assume that route tags < 256.
27 * It allows to use direct table lookups, instead of hash tables.
28 * 2. For now we assume that "from TAG" and "fromdev DEV" statements
29 * are mutually exclusive.
30 * 3. "to TAG from ANY" has higher priority, than "to ANY from XXX"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 */
32
Eric Dumazetcc7ec452011-01-19 19:26:56 +000033struct route4_fastmap {
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 struct route4_filter *filter;
35 u32 id;
36 int iif;
37};
38
Eric Dumazetcc7ec452011-01-19 19:26:56 +000039struct route4_head {
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 struct route4_fastmap fastmap[16];
Eric Dumazetcc7ec452011-01-19 19:26:56 +000041 struct route4_bucket *table[256 + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070042};
43
Eric Dumazetcc7ec452011-01-19 19:26:56 +000044struct route4_bucket {
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
Eric Dumazetcc7ec452011-01-19 19:26:56 +000046 struct route4_filter *ht[16 + 16 + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
Eric Dumazetcc7ec452011-01-19 19:26:56 +000049struct route4_filter {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 struct route4_filter *next;
51 u32 id;
52 int iif;
53
54 struct tcf_result res;
55 struct tcf_exts exts;
56 u32 handle;
57 struct route4_bucket *bkt;
58};
59
Eric Dumazetcc7ec452011-01-19 19:26:56 +000060#define ROUTE4_FAILURE ((struct route4_filter *)(-1L))
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Patrick McHardy52390082008-01-31 18:36:18 -080062static const struct tcf_ext_map route_ext_map = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .police = TCA_ROUTE4_POLICE,
64 .action = TCA_ROUTE4_ACT
65};
66
Eric Dumazetcc7ec452011-01-19 19:26:56 +000067static inline int route4_fastmap_hash(u32 id, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
Eric Dumazetcc7ec452011-01-19 19:26:56 +000069 return id & 0xF;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
Eric Dumazetcc7ec452011-01-19 19:26:56 +000072static void
73route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Jarek Poplawski102396a2008-08-29 14:21:52 -070075 spinlock_t *root_lock = qdisc_root_sleeping_lock(q);
David S. Miller15b458f2008-07-16 02:42:51 -070076
77 spin_lock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 memset(head->fastmap, 0, sizeof(head->fastmap));
David S. Miller15b458f2008-07-16 02:42:51 -070079 spin_unlock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
Eric Dumazetcc7ec452011-01-19 19:26:56 +000082static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070083route4_set_fastmap(struct route4_head *head, u32 id, int iif,
84 struct route4_filter *f)
85{
86 int h = route4_fastmap_hash(id, iif);
Eric Dumazetcc7ec452011-01-19 19:26:56 +000087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 head->fastmap[h].id = id;
89 head->fastmap[h].iif = iif;
90 head->fastmap[h].filter = f;
91}
92
Eric Dumazetcc7ec452011-01-19 19:26:56 +000093static inline int route4_hash_to(u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
Eric Dumazetcc7ec452011-01-19 19:26:56 +000095 return id & 0xFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
Eric Dumazetcc7ec452011-01-19 19:26:56 +000098static inline int route4_hash_from(u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000100 return (id >> 16) & 0xF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000103static inline int route4_hash_iif(int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000105 return 16 + ((iif >> 16) & 0xF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000108static inline int route4_hash_wild(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 return 32;
111}
112
113#define ROUTE4_APPLY_RESULT() \
114{ \
115 *res = f->res; \
116 if (tcf_exts_is_available(&f->exts)) { \
117 int r = tcf_exts_exec(skb, &f->exts, res); \
118 if (r < 0) { \
119 dont_cache = 1; \
120 continue; \
121 } \
122 return r; \
123 } else if (!dont_cache) \
124 route4_set_fastmap(head, id, iif, f); \
125 return 0; \
126}
127
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000128static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 struct tcf_result *res)
130{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000131 struct route4_head *head = (struct route4_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 struct dst_entry *dst;
133 struct route4_bucket *b;
134 struct route4_filter *f;
135 u32 id, h;
136 int iif, dont_cache = 0;
137
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000138 dst = skb_dst(skb);
139 if (!dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 goto failure;
141
142 id = dst->tclassid;
143 if (head == NULL)
144 goto old_method;
145
David S. Miller92101b32012-07-23 16:29:00 -0700146 iif = inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 h = route4_fastmap_hash(id, iif);
149 if (id == head->fastmap[h].id &&
150 iif == head->fastmap[h].iif &&
151 (f = head->fastmap[h].filter) != NULL) {
152 if (f == ROUTE4_FAILURE)
153 goto failure;
154
155 *res = f->res;
156 return 0;
157 }
158
159 h = route4_hash_to(id);
160
161restart:
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000162 b = head->table[h];
163 if (b) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 for (f = b->ht[route4_hash_from(id)]; f; f = f->next)
165 if (f->id == id)
166 ROUTE4_APPLY_RESULT();
167
168 for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next)
169 if (f->iif == iif)
170 ROUTE4_APPLY_RESULT();
171
172 for (f = b->ht[route4_hash_wild()]; f; f = f->next)
173 ROUTE4_APPLY_RESULT();
174
175 }
176 if (h < 256) {
177 h = 256;
178 id &= ~0xFFFF;
179 goto restart;
180 }
181
182 if (!dont_cache)
183 route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
184failure:
185 return -1;
186
187old_method:
188 if (id && (TC_H_MAJ(id) == 0 ||
189 !(TC_H_MAJ(id^tp->q->handle)))) {
190 res->classid = id;
191 res->class = 0;
192 return 0;
193 }
194 return -1;
195}
196
197static inline u32 to_hash(u32 id)
198{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000199 u32 h = id & 0xFF;
200
201 if (id & 0x8000)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 h += 256;
203 return h;
204}
205
206static inline u32 from_hash(u32 id)
207{
208 id &= 0xFFFF;
209 if (id == 0xFFFF)
210 return 32;
211 if (!(id & 0x8000)) {
212 if (id > 255)
213 return 256;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000214 return id & 0xF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000216 return 16 + (id & 0xF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
219static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
220{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000221 struct route4_head *head = (struct route4_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 struct route4_bucket *b;
223 struct route4_filter *f;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000224 unsigned int h1, h2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 if (!head)
227 return 0;
228
229 h1 = to_hash(handle);
230 if (h1 > 256)
231 return 0;
232
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000233 h2 = from_hash(handle >> 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (h2 > 32)
235 return 0;
236
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000237 b = head->table[h1];
238 if (b) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 for (f = b->ht[h2]; f; f = f->next)
240 if (f->handle == handle)
241 return (unsigned long)f;
242 }
243 return 0;
244}
245
246static void route4_put(struct tcf_proto *tp, unsigned long f)
247{
248}
249
250static int route4_init(struct tcf_proto *tp)
251{
252 return 0;
253}
254
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000255static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
257{
258 tcf_unbind_filter(tp, &f->res);
259 tcf_exts_destroy(tp, &f->exts);
260 kfree(f);
261}
262
263static void route4_destroy(struct tcf_proto *tp)
264{
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000265 struct route4_head *head = tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 int h1, h2;
267
268 if (head == NULL)
269 return;
270
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000271 for (h1 = 0; h1 <= 256; h1++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 struct route4_bucket *b;
273
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000274 b = head->table[h1];
275 if (b) {
276 for (h2 = 0; h2 <= 32; h2++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct route4_filter *f;
278
279 while ((f = b->ht[h2]) != NULL) {
280 b->ht[h2] = f->next;
281 route4_delete_filter(tp, f);
282 }
283 }
284 kfree(b);
285 }
286 }
287 kfree(head);
288}
289
290static int route4_delete(struct tcf_proto *tp, unsigned long arg)
291{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000292 struct route4_head *head = (struct route4_head *)tp->root;
293 struct route4_filter **fp, *f = (struct route4_filter *)arg;
294 unsigned int h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 struct route4_bucket *b;
296 int i;
297
298 if (!head || !f)
299 return -EINVAL;
300
301 h = f->handle;
302 b = f->bkt;
303
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000304 for (fp = &b->ht[from_hash(h >> 16)]; *fp; fp = &(*fp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 if (*fp == f) {
306 tcf_tree_lock(tp);
307 *fp = f->next;
308 tcf_tree_unlock(tp);
309
David S. Miller15b458f2008-07-16 02:42:51 -0700310 route4_reset_fastmap(tp->q, head, f->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 route4_delete_filter(tp, f);
312
313 /* Strip tree */
314
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000315 for (i = 0; i <= 32; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 if (b->ht[i])
317 return 0;
318
319 /* OK, session has no flows */
320 tcf_tree_lock(tp);
321 head->table[to_hash(h)] = NULL;
322 tcf_tree_unlock(tp);
323
324 kfree(b);
325 return 0;
326 }
327 }
328 return 0;
329}
330
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800331static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = {
332 [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 },
333 [TCA_ROUTE4_TO] = { .type = NLA_U32 },
334 [TCA_ROUTE4_FROM] = { .type = NLA_U32 },
335 [TCA_ROUTE4_IIF] = { .type = NLA_U32 },
336};
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
339 struct route4_filter *f, u32 handle, struct route4_head *head,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800340 struct nlattr **tb, struct nlattr *est, int new)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
342 int err;
343 u32 id = 0, to = 0, nhandle = 0x8000;
344 struct route4_filter *fp;
345 unsigned int h1;
346 struct route4_bucket *b;
347 struct tcf_exts e;
348
349 err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map);
350 if (err < 0)
351 return err;
352
353 err = -EINVAL;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800354 if (tb[TCA_ROUTE4_TO]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (new && handle & 0x8000)
356 goto errout;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800357 to = nla_get_u32(tb[TCA_ROUTE4_TO]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if (to > 0xFF)
359 goto errout;
360 nhandle = to;
361 }
362
Patrick McHardyadd93b62008-01-22 22:11:33 -0800363 if (tb[TCA_ROUTE4_FROM]) {
364 if (tb[TCA_ROUTE4_IIF])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 goto errout;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800366 id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 if (id > 0xFF)
368 goto errout;
369 nhandle |= id << 16;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800370 } else if (tb[TCA_ROUTE4_IIF]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800371 id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (id > 0x7FFF)
373 goto errout;
374 nhandle |= (id | 0x8000) << 16;
375 } else
376 nhandle |= 0xFFFF << 16;
377
378 if (handle && new) {
379 nhandle |= handle & 0x7F00;
380 if (nhandle != handle)
381 goto errout;
382 }
383
384 h1 = to_hash(nhandle);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000385 b = head->table[h1];
386 if (!b) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 err = -ENOBUFS;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700388 b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 if (b == NULL)
390 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 tcf_tree_lock(tp);
393 head->table[h1] = b;
394 tcf_tree_unlock(tp);
395 } else {
396 unsigned int h2 = from_hash(nhandle >> 16);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 err = -EEXIST;
399 for (fp = b->ht[h2]; fp; fp = fp->next)
400 if (fp->handle == f->handle)
401 goto errout;
402 }
403
404 tcf_tree_lock(tp);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800405 if (tb[TCA_ROUTE4_TO])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 f->id = to;
407
Patrick McHardyadd93b62008-01-22 22:11:33 -0800408 if (tb[TCA_ROUTE4_FROM])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 f->id = to | id<<16;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800410 else if (tb[TCA_ROUTE4_IIF])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 f->iif = id;
412
413 f->handle = nhandle;
414 f->bkt = b;
415 tcf_tree_unlock(tp);
416
Patrick McHardyadd93b62008-01-22 22:11:33 -0800417 if (tb[TCA_ROUTE4_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800418 f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 tcf_bind_filter(tp, &f->res, base);
420 }
421
422 tcf_exts_change(tp, &f->exts, &e);
423
424 return 0;
425errout:
426 tcf_exts_destroy(tp, &e);
427 return err;
428}
429
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600430static int route4_change(struct sk_buff *in_skb,
431 struct tcf_proto *tp, unsigned long base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 u32 handle,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800433 struct nlattr **tca,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 unsigned long *arg)
435{
436 struct route4_head *head = tp->root;
437 struct route4_filter *f, *f1, **fp;
438 struct route4_bucket *b;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800439 struct nlattr *opt = tca[TCA_OPTIONS];
440 struct nlattr *tb[TCA_ROUTE4_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 unsigned int h, th;
442 u32 old_handle = 0;
443 int err;
444
445 if (opt == NULL)
446 return handle ? -EINVAL : 0;
447
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800448 err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800449 if (err < 0)
450 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000452 f = (struct route4_filter *)*arg;
453 if (f) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (f->handle != handle && handle)
455 return -EINVAL;
456
457 if (f->bkt)
458 old_handle = f->handle;
459
460 err = route4_set_parms(tp, base, f, handle, head, tb,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800461 tca[TCA_RATE], 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 if (err < 0)
463 return err;
464
465 goto reinsert;
466 }
467
468 err = -ENOBUFS;
469 if (head == NULL) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700470 head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (head == NULL)
472 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 tcf_tree_lock(tp);
475 tp->root = head;
476 tcf_tree_unlock(tp);
477 }
478
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700479 f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (f == NULL)
481 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 err = route4_set_parms(tp, base, f, handle, head, tb,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800484 tca[TCA_RATE], 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (err < 0)
486 goto errout;
487
488reinsert:
489 h = from_hash(f->handle >> 16);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000490 for (fp = &f->bkt->ht[h]; (f1 = *fp) != NULL; fp = &f1->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 if (f->handle < f1->handle)
492 break;
493
494 f->next = f1;
495 tcf_tree_lock(tp);
496 *fp = f;
497
498 if (old_handle && f->handle != old_handle) {
499 th = to_hash(old_handle);
500 h = from_hash(old_handle >> 16);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000501 b = head->table[th];
502 if (b) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
504 if (*fp == f) {
505 *fp = f->next;
506 break;
507 }
508 }
509 }
510 }
511 tcf_tree_unlock(tp);
512
David S. Miller15b458f2008-07-16 02:42:51 -0700513 route4_reset_fastmap(tp->q, head, f->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 *arg = (unsigned long)f;
515 return 0;
516
517errout:
Jesper Juhla51482b2005-11-08 09:41:34 -0800518 kfree(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 return err;
520}
521
522static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
523{
524 struct route4_head *head = tp->root;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000525 unsigned int h, h1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 if (head == NULL)
528 arg->stop = 1;
529
530 if (arg->stop)
531 return;
532
533 for (h = 0; h <= 256; h++) {
534 struct route4_bucket *b = head->table[h];
535
536 if (b) {
537 for (h1 = 0; h1 <= 32; h1++) {
538 struct route4_filter *f;
539
540 for (f = b->ht[h1]; f; f = f->next) {
541 if (arg->count < arg->skip) {
542 arg->count++;
543 continue;
544 }
545 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
546 arg->stop = 1;
547 return;
548 }
549 arg->count++;
550 }
551 }
552 }
553 }
554}
555
556static int route4_dump(struct tcf_proto *tp, unsigned long fh,
557 struct sk_buff *skb, struct tcmsg *t)
558{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000559 struct route4_filter *f = (struct route4_filter *)fh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700560 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800561 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 u32 id;
563
564 if (f == NULL)
565 return skb->len;
566
567 t->tcm_handle = f->handle;
568
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800569 nest = nla_nest_start(skb, TCA_OPTIONS);
570 if (nest == NULL)
571 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000573 if (!(f->handle & 0x8000)) {
574 id = f->id & 0xFF;
David S. Miller1b34ec42012-03-29 05:11:39 -0400575 if (nla_put_u32(skb, TCA_ROUTE4_TO, id))
576 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000578 if (f->handle & 0x80000000) {
David S. Miller1b34ec42012-03-29 05:11:39 -0400579 if ((f->handle >> 16) != 0xFFFF &&
580 nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif))
581 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000583 id = f->id >> 16;
David S. Miller1b34ec42012-03-29 05:11:39 -0400584 if (nla_put_u32(skb, TCA_ROUTE4_FROM, id))
585 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400587 if (f->res.classid &&
588 nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid))
589 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
591 if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800592 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800594 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
596 if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800597 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599 return skb->len;
600
Patrick McHardyadd93b62008-01-22 22:11:33 -0800601nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700602 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 return -1;
604}
605
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800606static struct tcf_proto_ops cls_route4_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 .kind = "route",
608 .classify = route4_classify,
609 .init = route4_init,
610 .destroy = route4_destroy,
611 .get = route4_get,
612 .put = route4_put,
613 .change = route4_change,
614 .delete = route4_delete,
615 .walk = route4_walk,
616 .dump = route4_dump,
617 .owner = THIS_MODULE,
618};
619
620static int __init init_route4(void)
621{
622 return register_tcf_proto_ops(&cls_route4_ops);
623}
624
625static void __exit exit_route4(void)
626{
627 unregister_tcf_proto_ops(&cls_route4_ops);
628}
629
630module_init(init_route4)
631module_exit(exit_route4)
632MODULE_LICENSE("GPL");