blob: eb07a1e536e6cb6f0b1f44099f130119490e9f52 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet 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 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
14 *
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
19 *
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
22 *
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
26 *
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
29 *
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
31 */
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/types.h>
36#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/skbuff.h>
Patrick McHardy0ba48052007-07-02 22:49:07 -070041#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <net/act_api.h>
43#include <net/pkt_cls.h>
44
Eric Dumazetcc7ec452011-01-19 19:26:56 +000045struct tc_u_knode {
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 struct tc_u_knode *next;
47 u32 handle;
48 struct tc_u_hnode *ht_up;
49 struct tcf_exts exts;
50#ifdef CONFIG_NET_CLS_IND
51 char indev[IFNAMSIZ];
52#endif
53 u8 fshift;
54 struct tcf_result res;
55 struct tc_u_hnode *ht_down;
56#ifdef CONFIG_CLS_U32_PERF
57 struct tc_u32_pcnt *pf;
58#endif
59#ifdef CONFIG_CLS_U32_MARK
60 struct tc_u32_mark mark;
61#endif
62 struct tc_u32_sel sel;
63};
64
Eric Dumazetcc7ec452011-01-19 19:26:56 +000065struct tc_u_hnode {
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 struct tc_u_hnode *next;
67 u32 handle;
68 u32 prio;
69 struct tc_u_common *tp_c;
70 int refcnt;
Eric Dumazetcc7ec452011-01-19 19:26:56 +000071 unsigned int divisor;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 struct tc_u_knode *ht[1];
73};
74
Eric Dumazetcc7ec452011-01-19 19:26:56 +000075struct tc_u_common {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 struct tc_u_hnode *hlist;
77 struct Qdisc *q;
78 int refcnt;
79 u32 hgenerator;
80};
81
Patrick McHardy52390082008-01-31 18:36:18 -080082static const struct tcf_ext_map u32_ext_map = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 .action = TCA_U32_ACT,
84 .police = TCA_U32_POLICE
85};
86
Eric Dumazetcc7ec452011-01-19 19:26:56 +000087static inline unsigned int u32_hash_fold(__be32 key,
88 const struct tc_u32_sel *sel,
89 u8 fshift)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Eric Dumazetcc7ec452011-01-19 19:26:56 +000091 unsigned int h = ntohl(key & sel->hmask) >> fshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 return h;
94}
95
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000096static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
98 struct {
99 struct tc_u_knode *knode;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700100 unsigned int off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 } stack[TC_U32_MAXDEPTH];
102
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000103 struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700104 unsigned int off = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 struct tc_u_knode *n;
106 int sdepth = 0;
107 int off2 = 0;
108 int sel = 0;
109#ifdef CONFIG_CLS_U32_PERF
110 int j;
111#endif
112 int i, r;
113
114next_ht:
115 n = ht->ht[sel];
116
117next_knode:
118 if (n) {
119 struct tc_u32_key *key = n->sel.keys;
120
121#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000122 n->pf->rcnt += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 j = 0;
124#endif
125
126#ifdef CONFIG_CLS_U32_MARK
Thomas Graf82e91ff2006-11-09 15:19:14 -0800127 if ((skb->mark & n->mark.mask) != n->mark.val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 n = n->next;
129 goto next_knode;
130 } else {
131 n->mark.success++;
132 }
133#endif
134
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000135 for (i = n->sel.nkeys; i > 0; i--, key++) {
stephen hemminger66d50d22010-08-02 13:44:13 +0000136 int toff = off + key->off + (off2 & key->offmask);
stephen hemminger86fce3b2011-02-20 16:14:23 +0000137 __be32 *data, hdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Dan Carpenter4e18b3e2010-10-04 02:28:36 +0000139 if (skb_headroom(skb) + toff > INT_MAX)
stephen hemminger66d50d22010-08-02 13:44:13 +0000140 goto out;
141
stephen hemminger86fce3b2011-02-20 16:14:23 +0000142 data = skb_header_pointer(skb, toff, 4, &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700143 if (!data)
144 goto out;
145 if ((*data ^ key->val) & key->mask) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 n = n->next;
147 goto next_knode;
148 }
149#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000150 n->pf->kcnts[j] += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 j++;
152#endif
153 }
154 if (n->ht_down == NULL) {
155check_terminal:
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000156 if (n->sel.flags & TC_U32_TERMINAL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158 *res = n->res;
159#ifdef CONFIG_NET_CLS_IND
160 if (!tcf_match_indev(skb, n->indev)) {
161 n = n->next;
162 goto next_knode;
163 }
164#endif
165#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000166 n->pf->rhit += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167#endif
168 r = tcf_exts_exec(skb, &n->exts, res);
169 if (r < 0) {
170 n = n->next;
171 goto next_knode;
172 }
173
174 return r;
175 }
176 n = n->next;
177 goto next_knode;
178 }
179
180 /* PUSH */
181 if (sdepth >= TC_U32_MAXDEPTH)
182 goto deadloop;
183 stack[sdepth].knode = n;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700184 stack[sdepth].off = off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 sdepth++;
186
187 ht = n->ht_down;
188 sel = 0;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700189 if (ht->divisor) {
stephen hemminger86fce3b2011-02-20 16:14:23 +0000190 __be32 *data, hdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700192 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
stephen hemminger86fce3b2011-02-20 16:14:23 +0000193 &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700194 if (!data)
195 goto out;
196 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
197 n->fshift);
198 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000199 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 goto next_ht;
201
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000202 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 off2 = n->sel.off + 3;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700204 if (n->sel.flags & TC_U32_VAROFFSET) {
stephen hemminger86fce3b2011-02-20 16:14:23 +0000205 __be16 *data, hdata;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700206
207 data = skb_header_pointer(skb,
208 off + n->sel.offoff,
stephen hemminger86fce3b2011-02-20 16:14:23 +0000209 2, &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700210 if (!data)
211 goto out;
212 off2 += ntohs(n->sel.offmask & *data) >>
213 n->sel.offshift;
214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 off2 &= ~3;
216 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000217 if (n->sel.flags & TC_U32_EAT) {
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700218 off += off2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 off2 = 0;
220 }
221
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700222 if (off < skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 goto next_ht;
224 }
225
226 /* POP */
227 if (sdepth--) {
228 n = stack[sdepth].knode;
229 ht = n->ht_up;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700230 off = stack[sdepth].off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 goto check_terminal;
232 }
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700233out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -1;
235
236deadloop:
Joe Perchese87cc472012-05-13 21:56:26 +0000237 net_warn_ratelimited("cls_u32: dead loop\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return -1;
239}
240
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000241static struct tc_u_hnode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
243{
244 struct tc_u_hnode *ht;
245
246 for (ht = tp_c->hlist; ht; ht = ht->next)
247 if (ht->handle == handle)
248 break;
249
250 return ht;
251}
252
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000253static struct tc_u_knode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
255{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000256 unsigned int sel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct tc_u_knode *n = NULL;
258
259 sel = TC_U32_HASH(handle);
260 if (sel > ht->divisor)
261 goto out;
262
263 for (n = ht->ht[sel]; n; n = n->next)
264 if (n->handle == handle)
265 break;
266out:
267 return n;
268}
269
270
271static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
272{
273 struct tc_u_hnode *ht;
274 struct tc_u_common *tp_c = tp->data;
275
276 if (TC_U32_HTID(handle) == TC_U32_ROOT)
277 ht = tp->root;
278 else
279 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
280
281 if (!ht)
282 return 0;
283
284 if (TC_U32_KEY(handle) == 0)
285 return (unsigned long)ht;
286
287 return (unsigned long)u32_lookup_key(ht, handle);
288}
289
290static void u32_put(struct tcf_proto *tp, unsigned long f)
291{
292}
293
294static u32 gen_new_htid(struct tc_u_common *tp_c)
295{
296 int i = 0x800;
297
298 do {
299 if (++tp_c->hgenerator == 0x7FF)
300 tp_c->hgenerator = 1;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000301 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
304}
305
306static int u32_init(struct tcf_proto *tp)
307{
308 struct tc_u_hnode *root_ht;
309 struct tc_u_common *tp_c;
310
David S. Miller72b25a92008-07-18 20:54:17 -0700311 tp_c = tp->q->u32_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700313 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (root_ht == NULL)
315 return -ENOBUFS;
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 root_ht->divisor = 0;
318 root_ht->refcnt++;
319 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
320 root_ht->prio = tp->prio;
321
322 if (tp_c == NULL) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700323 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (tp_c == NULL) {
325 kfree(root_ht);
326 return -ENOBUFS;
327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 tp_c->q = tp->q;
David S. Miller72b25a92008-07-18 20:54:17 -0700329 tp->q->u32_node = tp_c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 }
331
332 tp_c->refcnt++;
333 root_ht->next = tp_c->hlist;
334 tp_c->hlist = root_ht;
335 root_ht->tp_c = tp_c;
336
337 tp->root = root_ht;
338 tp->data = tp_c;
339 return 0;
340}
341
342static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
343{
344 tcf_unbind_filter(tp, &n->res);
345 tcf_exts_destroy(tp, &n->exts);
346 if (n->ht_down)
347 n->ht_down->refcnt--;
348#ifdef CONFIG_CLS_U32_PERF
Patrick McHardy1ae39a42006-03-23 01:16:48 -0800349 kfree(n->pf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350#endif
351 kfree(n);
352 return 0;
353}
354
355static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
356{
357 struct tc_u_knode **kp;
358 struct tc_u_hnode *ht = key->ht_up;
359
360 if (ht) {
361 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
362 if (*kp == key) {
363 tcf_tree_lock(tp);
364 *kp = key->next;
365 tcf_tree_unlock(tp);
366
367 u32_destroy_key(tp, key);
368 return 0;
369 }
370 }
371 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700372 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return 0;
374}
375
376static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
377{
378 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000379 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000381 for (h = 0; h <= ht->divisor; h++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 while ((n = ht->ht[h]) != NULL) {
383 ht->ht[h] = n->next;
384
385 u32_destroy_key(tp, n);
386 }
387 }
388}
389
390static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
391{
392 struct tc_u_common *tp_c = tp->data;
393 struct tc_u_hnode **hn;
394
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700395 WARN_ON(ht->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397 u32_clear_hnode(tp, ht);
398
399 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
400 if (*hn == ht) {
401 *hn = ht->next;
402 kfree(ht);
403 return 0;
404 }
405 }
406
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700407 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return -ENOENT;
409}
410
411static void u32_destroy(struct tcf_proto *tp)
412{
413 struct tc_u_common *tp_c = tp->data;
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000414 struct tc_u_hnode *root_ht = tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700416 WARN_ON(root_ht == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 if (root_ht && --root_ht->refcnt == 0)
419 u32_destroy_hnode(tp, root_ht);
420
421 if (--tp_c->refcnt == 0) {
422 struct tc_u_hnode *ht;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
David S. Miller72b25a92008-07-18 20:54:17 -0700424 tp->q->u32_node = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700426 for (ht = tp_c->hlist; ht; ht = ht->next) {
427 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 u32_clear_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 while ((ht = tp_c->hlist) != NULL) {
432 tp_c->hlist = ht->next;
433
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700434 WARN_ON(ht->refcnt != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 kfree(ht);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700437 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 kfree(tp_c);
440 }
441
442 tp->data = NULL;
443}
444
445static int u32_delete(struct tcf_proto *tp, unsigned long arg)
446{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000447 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
449 if (ht == NULL)
450 return 0;
451
452 if (TC_U32_KEY(ht->handle))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000453 return u32_delete_key(tp, (struct tc_u_knode *)ht);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 if (tp->root == ht)
456 return -EINVAL;
457
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700458 if (ht->refcnt == 1) {
459 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 u32_destroy_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700461 } else {
462 return -EBUSY;
463 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465 return 0;
466}
467
468static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
469{
470 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000471 unsigned int i = 0x7FF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000473 for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (i < TC_U32_NODE(n->handle))
475 i = TC_U32_NODE(n->handle);
476 i++;
477
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000478 return handle | (i > 0xFFF ? 0xFFF : i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479}
480
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800481static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
482 [TCA_U32_CLASSID] = { .type = NLA_U32 },
483 [TCA_U32_HASH] = { .type = NLA_U32 },
484 [TCA_U32_LINK] = { .type = NLA_U32 },
485 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
486 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
487 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
488 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
489};
490
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000491static int u32_set_parms(struct net *net, struct tcf_proto *tp,
492 unsigned long base, struct tc_u_hnode *ht,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800493 struct tc_u_knode *n, struct nlattr **tb,
494 struct nlattr *est)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
496 int err;
497 struct tcf_exts e;
498
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000499 err = tcf_exts_validate(net, tp, tb, est, &e, &u32_ext_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (err < 0)
501 return err;
502
503 err = -EINVAL;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800504 if (tb[TCA_U32_LINK]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800505 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000506 struct tc_u_hnode *ht_down = NULL, *ht_old;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 if (TC_U32_KEY(handle))
509 goto errout;
510
511 if (handle) {
512 ht_down = u32_lookup_ht(ht->tp_c, handle);
513
514 if (ht_down == NULL)
515 goto errout;
516 ht_down->refcnt++;
517 }
518
519 tcf_tree_lock(tp);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000520 ht_old = n->ht_down;
521 n->ht_down = ht_down;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 tcf_tree_unlock(tp);
523
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000524 if (ht_old)
525 ht_old->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 }
Patrick McHardyadd93b62008-01-22 22:11:33 -0800527 if (tb[TCA_U32_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800528 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 tcf_bind_filter(tp, &n->res, base);
530 }
531
532#ifdef CONFIG_NET_CLS_IND
Patrick McHardyadd93b62008-01-22 22:11:33 -0800533 if (tb[TCA_U32_INDEV]) {
534 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 if (err < 0)
536 goto errout;
537 }
538#endif
539 tcf_exts_change(tp, &n->exts, &e);
540
541 return 0;
542errout:
543 tcf_exts_destroy(tp, &e);
544 return err;
545}
546
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000547static int u32_change(struct net *net, struct sk_buff *in_skb,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600548 struct tcf_proto *tp, unsigned long base, u32 handle,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800549 struct nlattr **tca,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 unsigned long *arg)
551{
552 struct tc_u_common *tp_c = tp->data;
553 struct tc_u_hnode *ht;
554 struct tc_u_knode *n;
555 struct tc_u32_sel *s;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800556 struct nlattr *opt = tca[TCA_OPTIONS];
557 struct nlattr *tb[TCA_U32_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 u32 htid;
559 int err;
560
561 if (opt == NULL)
562 return handle ? -EINVAL : 0;
563
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800564 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800565 if (err < 0)
566 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000568 n = (struct tc_u_knode *)*arg;
569 if (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (TC_U32_KEY(n->handle) == 0)
571 return -EINVAL;
572
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000573 return u32_set_parms(net, tp, base, n->ht_up, n, tb,
574 tca[TCA_RATE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
576
Patrick McHardyadd93b62008-01-22 22:11:33 -0800577 if (tb[TCA_U32_DIVISOR]) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000578 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 if (--divisor > 0x100)
581 return -EINVAL;
582 if (TC_U32_KEY(handle))
583 return -EINVAL;
584 if (handle == 0) {
585 handle = gen_new_htid(tp->data);
586 if (handle == 0)
587 return -ENOMEM;
588 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000589 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 if (ht == NULL)
591 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 ht->tp_c = tp_c;
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700593 ht->refcnt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 ht->divisor = divisor;
595 ht->handle = handle;
596 ht->prio = tp->prio;
597 ht->next = tp_c->hlist;
598 tp_c->hlist = ht;
599 *arg = (unsigned long)ht;
600 return 0;
601 }
602
Patrick McHardyadd93b62008-01-22 22:11:33 -0800603 if (tb[TCA_U32_HASH]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800604 htid = nla_get_u32(tb[TCA_U32_HASH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
606 ht = tp->root;
607 htid = ht->handle;
608 } else {
609 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
610 if (ht == NULL)
611 return -EINVAL;
612 }
613 } else {
614 ht = tp->root;
615 htid = ht->handle;
616 }
617
618 if (ht->divisor < TC_U32_HASH(htid))
619 return -EINVAL;
620
621 if (handle) {
622 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
623 return -EINVAL;
624 handle = htid | TC_U32_NODE(handle);
625 } else
626 handle = gen_new_kid(ht, htid);
627
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800628 if (tb[TCA_U32_SEL] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 return -EINVAL;
630
Patrick McHardyadd93b62008-01-22 22:11:33 -0800631 s = nla_data(tb[TCA_U32_SEL]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700633 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 if (n == NULL)
635 return -ENOBUFS;
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637#ifdef CONFIG_CLS_U32_PERF
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700638 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (n->pf == NULL) {
640 kfree(n);
641 return -ENOBUFS;
642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643#endif
644
645 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
646 n->ht_up = ht;
647 n->handle = handle;
Radu Rendecb2268012007-11-10 21:54:50 -0800648 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650#ifdef CONFIG_CLS_U32_MARK
Patrick McHardyadd93b62008-01-22 22:11:33 -0800651 if (tb[TCA_U32_MARK]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 struct tc_u32_mark *mark;
653
Patrick McHardyadd93b62008-01-22 22:11:33 -0800654 mark = nla_data(tb[TCA_U32_MARK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
656 n->mark.success = 0;
657 }
658#endif
659
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000660 err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (err == 0) {
662 struct tc_u_knode **ins;
663 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
664 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
665 break;
666
667 n->next = *ins;
Jarek Poplawski6f573212009-01-05 18:14:19 -0800668 tcf_tree_lock(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 *ins = n;
Jarek Poplawski6f573212009-01-05 18:14:19 -0800670 tcf_tree_unlock(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 *arg = (unsigned long)n;
673 return 0;
674 }
675#ifdef CONFIG_CLS_U32_PERF
Patrick McHardy1ae39a42006-03-23 01:16:48 -0800676 kfree(n->pf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677#endif
678 kfree(n);
679 return err;
680}
681
682static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
683{
684 struct tc_u_common *tp_c = tp->data;
685 struct tc_u_hnode *ht;
686 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000687 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 if (arg->stop)
690 return;
691
692 for (ht = tp_c->hlist; ht; ht = ht->next) {
693 if (ht->prio != tp->prio)
694 continue;
695 if (arg->count >= arg->skip) {
696 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
697 arg->stop = 1;
698 return;
699 }
700 }
701 arg->count++;
702 for (h = 0; h <= ht->divisor; h++) {
703 for (n = ht->ht[h]; n; n = n->next) {
704 if (arg->count < arg->skip) {
705 arg->count++;
706 continue;
707 }
708 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
709 arg->stop = 1;
710 return;
711 }
712 arg->count++;
713 }
714 }
715 }
716}
717
718static int u32_dump(struct tcf_proto *tp, unsigned long fh,
719 struct sk_buff *skb, struct tcmsg *t)
720{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000721 struct tc_u_knode *n = (struct tc_u_knode *)fh;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800722 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 if (n == NULL)
725 return skb->len;
726
727 t->tcm_handle = n->handle;
728
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800729 nest = nla_nest_start(skb, TCA_OPTIONS);
730 if (nest == NULL)
731 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733 if (TC_U32_KEY(n->handle) == 0) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000734 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
735 u32 divisor = ht->divisor + 1;
736
David S. Miller1b34ec42012-03-29 05:11:39 -0400737 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
738 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 } else {
David S. Miller1b34ec42012-03-29 05:11:39 -0400740 if (nla_put(skb, TCA_U32_SEL,
741 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
742 &n->sel))
743 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 if (n->ht_up) {
745 u32 htid = n->handle & 0xFFFFF000;
David S. Miller1b34ec42012-03-29 05:11:39 -0400746 if (nla_put_u32(skb, TCA_U32_HASH, htid))
747 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400749 if (n->res.classid &&
750 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
751 goto nla_put_failure;
752 if (n->ht_down &&
753 nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
754 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756#ifdef CONFIG_CLS_U32_MARK
David S. Miller1b34ec42012-03-29 05:11:39 -0400757 if ((n->mark.val || n->mark.mask) &&
758 nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
759 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760#endif
761
762 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800763 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765#ifdef CONFIG_NET_CLS_IND
David S. Miller1b34ec42012-03-29 05:11:39 -0400766 if (strlen(n->indev) &&
767 nla_put_string(skb, TCA_U32_INDEV, n->indev))
768 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769#endif
770#ifdef CONFIG_CLS_U32_PERF
David S. Miller1b34ec42012-03-29 05:11:39 -0400771 if (nla_put(skb, TCA_U32_PCNT,
772 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
773 n->pf))
774 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775#endif
776 }
777
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800778 nla_nest_end(skb, nest);
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (TC_U32_KEY(n->handle))
781 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800782 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 return skb->len;
784
Patrick McHardyadd93b62008-01-22 22:11:33 -0800785nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800786 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 return -1;
788}
789
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800790static struct tcf_proto_ops cls_u32_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 .kind = "u32",
792 .classify = u32_classify,
793 .init = u32_init,
794 .destroy = u32_destroy,
795 .get = u32_get,
796 .put = u32_put,
797 .change = u32_change,
798 .delete = u32_delete,
799 .walk = u32_walk,
800 .dump = u32_dump,
801 .owner = THIS_MODULE,
802};
803
804static int __init init_u32(void)
805{
stephen hemminger6ff9c362010-05-12 06:37:05 +0000806 pr_info("u32 classifier\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807#ifdef CONFIG_CLS_U32_PERF
stephen hemminger6ff9c362010-05-12 06:37:05 +0000808 pr_info(" Performance counters on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810#ifdef CONFIG_NET_CLS_IND
stephen hemminger6ff9c362010-05-12 06:37:05 +0000811 pr_info(" input device check on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812#endif
813#ifdef CONFIG_NET_CLS_ACT
stephen hemminger6ff9c362010-05-12 06:37:05 +0000814 pr_info(" Actions configured\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815#endif
816 return register_tcf_proto_ops(&cls_u32_ops);
817}
818
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900819static void __exit exit_u32(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
821 unregister_tcf_proto_ops(&cls_u32_ops);
822}
823
824module_init(init_u32)
825module_exit(exit_u32)
826MODULE_LICENSE("GPL");