blob: 939b627b4795f7852323fbd8673a47b43ac1e61b [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:
237 if (net_ratelimit())
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000238 pr_warning("cls_u32: dead loop\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 return -1;
240}
241
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000242static struct tc_u_hnode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
244{
245 struct tc_u_hnode *ht;
246
247 for (ht = tp_c->hlist; ht; ht = ht->next)
248 if (ht->handle == handle)
249 break;
250
251 return ht;
252}
253
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000254static struct tc_u_knode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
256{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000257 unsigned int sel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 struct tc_u_knode *n = NULL;
259
260 sel = TC_U32_HASH(handle);
261 if (sel > ht->divisor)
262 goto out;
263
264 for (n = ht->ht[sel]; n; n = n->next)
265 if (n->handle == handle)
266 break;
267out:
268 return n;
269}
270
271
272static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
273{
274 struct tc_u_hnode *ht;
275 struct tc_u_common *tp_c = tp->data;
276
277 if (TC_U32_HTID(handle) == TC_U32_ROOT)
278 ht = tp->root;
279 else
280 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
281
282 if (!ht)
283 return 0;
284
285 if (TC_U32_KEY(handle) == 0)
286 return (unsigned long)ht;
287
288 return (unsigned long)u32_lookup_key(ht, handle);
289}
290
291static void u32_put(struct tcf_proto *tp, unsigned long f)
292{
293}
294
295static u32 gen_new_htid(struct tc_u_common *tp_c)
296{
297 int i = 0x800;
298
299 do {
300 if (++tp_c->hgenerator == 0x7FF)
301 tp_c->hgenerator = 1;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000302 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
305}
306
307static int u32_init(struct tcf_proto *tp)
308{
309 struct tc_u_hnode *root_ht;
310 struct tc_u_common *tp_c;
311
David S. Miller72b25a92008-07-18 20:54:17 -0700312 tp_c = tp->q->u32_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700314 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (root_ht == NULL)
316 return -ENOBUFS;
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 root_ht->divisor = 0;
319 root_ht->refcnt++;
320 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
321 root_ht->prio = tp->prio;
322
323 if (tp_c == NULL) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700324 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (tp_c == NULL) {
326 kfree(root_ht);
327 return -ENOBUFS;
328 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 tp_c->q = tp->q;
David S. Miller72b25a92008-07-18 20:54:17 -0700330 tp->q->u32_node = tp_c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332
333 tp_c->refcnt++;
334 root_ht->next = tp_c->hlist;
335 tp_c->hlist = root_ht;
336 root_ht->tp_c = tp_c;
337
338 tp->root = root_ht;
339 tp->data = tp_c;
340 return 0;
341}
342
343static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
344{
345 tcf_unbind_filter(tp, &n->res);
346 tcf_exts_destroy(tp, &n->exts);
347 if (n->ht_down)
348 n->ht_down->refcnt--;
349#ifdef CONFIG_CLS_U32_PERF
Patrick McHardy1ae39a42006-03-23 01:16:48 -0800350 kfree(n->pf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351#endif
352 kfree(n);
353 return 0;
354}
355
356static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
357{
358 struct tc_u_knode **kp;
359 struct tc_u_hnode *ht = key->ht_up;
360
361 if (ht) {
362 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
363 if (*kp == key) {
364 tcf_tree_lock(tp);
365 *kp = key->next;
366 tcf_tree_unlock(tp);
367
368 u32_destroy_key(tp, key);
369 return 0;
370 }
371 }
372 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700373 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return 0;
375}
376
377static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
378{
379 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000380 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000382 for (h = 0; h <= ht->divisor; h++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 while ((n = ht->ht[h]) != NULL) {
384 ht->ht[h] = n->next;
385
386 u32_destroy_key(tp, n);
387 }
388 }
389}
390
391static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
392{
393 struct tc_u_common *tp_c = tp->data;
394 struct tc_u_hnode **hn;
395
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700396 WARN_ON(ht->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 u32_clear_hnode(tp, ht);
399
400 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
401 if (*hn == ht) {
402 *hn = ht->next;
403 kfree(ht);
404 return 0;
405 }
406 }
407
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700408 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 return -ENOENT;
410}
411
412static void u32_destroy(struct tcf_proto *tp)
413{
414 struct tc_u_common *tp_c = tp->data;
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000415 struct tc_u_hnode *root_ht = tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700417 WARN_ON(root_ht == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 if (root_ht && --root_ht->refcnt == 0)
420 u32_destroy_hnode(tp, root_ht);
421
422 if (--tp_c->refcnt == 0) {
423 struct tc_u_hnode *ht;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
David S. Miller72b25a92008-07-18 20:54:17 -0700425 tp->q->u32_node = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700427 for (ht = tp_c->hlist; ht; ht = ht->next) {
428 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 u32_clear_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 while ((ht = tp_c->hlist) != NULL) {
433 tp_c->hlist = ht->next;
434
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700435 WARN_ON(ht->refcnt != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437 kfree(ht);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 kfree(tp_c);
441 }
442
443 tp->data = NULL;
444}
445
446static int u32_delete(struct tcf_proto *tp, unsigned long arg)
447{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000448 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 if (ht == NULL)
451 return 0;
452
453 if (TC_U32_KEY(ht->handle))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000454 return u32_delete_key(tp, (struct tc_u_knode *)ht);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 if (tp->root == ht)
457 return -EINVAL;
458
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700459 if (ht->refcnt == 1) {
460 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 u32_destroy_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700462 } else {
463 return -EBUSY;
464 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 return 0;
467}
468
469static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
470{
471 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000472 unsigned int i = 0x7FF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000474 for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (i < TC_U32_NODE(n->handle))
476 i = TC_U32_NODE(n->handle);
477 i++;
478
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000479 return handle | (i > 0xFFF ? 0xFFF : i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800482static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
483 [TCA_U32_CLASSID] = { .type = NLA_U32 },
484 [TCA_U32_HASH] = { .type = NLA_U32 },
485 [TCA_U32_LINK] = { .type = NLA_U32 },
486 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
487 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
488 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
489 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
490};
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
493 struct tc_u_hnode *ht,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800494 struct tc_u_knode *n, struct nlattr **tb,
495 struct nlattr *est)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 int err;
498 struct tcf_exts e;
499
500 err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
501 if (err < 0)
502 return err;
503
504 err = -EINVAL;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800505 if (tb[TCA_U32_LINK]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800506 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000507 struct tc_u_hnode *ht_down = NULL, *ht_old;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 if (TC_U32_KEY(handle))
510 goto errout;
511
512 if (handle) {
513 ht_down = u32_lookup_ht(ht->tp_c, handle);
514
515 if (ht_down == NULL)
516 goto errout;
517 ht_down->refcnt++;
518 }
519
520 tcf_tree_lock(tp);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000521 ht_old = n->ht_down;
522 n->ht_down = ht_down;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 tcf_tree_unlock(tp);
524
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000525 if (ht_old)
526 ht_old->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
Patrick McHardyadd93b62008-01-22 22:11:33 -0800528 if (tb[TCA_U32_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800529 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 tcf_bind_filter(tp, &n->res, base);
531 }
532
533#ifdef CONFIG_NET_CLS_IND
Patrick McHardyadd93b62008-01-22 22:11:33 -0800534 if (tb[TCA_U32_INDEV]) {
535 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (err < 0)
537 goto errout;
538 }
539#endif
540 tcf_exts_change(tp, &n->exts, &e);
541
542 return 0;
543errout:
544 tcf_exts_destroy(tp, &e);
545 return err;
546}
547
548static int u32_change(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
Patrick McHardyadd93b62008-01-22 22:11:33 -0800573 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
575
Patrick McHardyadd93b62008-01-22 22:11:33 -0800576 if (tb[TCA_U32_DIVISOR]) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000577 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 if (--divisor > 0x100)
580 return -EINVAL;
581 if (TC_U32_KEY(handle))
582 return -EINVAL;
583 if (handle == 0) {
584 handle = gen_new_htid(tp->data);
585 if (handle == 0)
586 return -ENOMEM;
587 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000588 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 if (ht == NULL)
590 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 ht->tp_c = tp_c;
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700592 ht->refcnt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 ht->divisor = divisor;
594 ht->handle = handle;
595 ht->prio = tp->prio;
596 ht->next = tp_c->hlist;
597 tp_c->hlist = ht;
598 *arg = (unsigned long)ht;
599 return 0;
600 }
601
Patrick McHardyadd93b62008-01-22 22:11:33 -0800602 if (tb[TCA_U32_HASH]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800603 htid = nla_get_u32(tb[TCA_U32_HASH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
605 ht = tp->root;
606 htid = ht->handle;
607 } else {
608 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
609 if (ht == NULL)
610 return -EINVAL;
611 }
612 } else {
613 ht = tp->root;
614 htid = ht->handle;
615 }
616
617 if (ht->divisor < TC_U32_HASH(htid))
618 return -EINVAL;
619
620 if (handle) {
621 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
622 return -EINVAL;
623 handle = htid | TC_U32_NODE(handle);
624 } else
625 handle = gen_new_kid(ht, htid);
626
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800627 if (tb[TCA_U32_SEL] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return -EINVAL;
629
Patrick McHardyadd93b62008-01-22 22:11:33 -0800630 s = nla_data(tb[TCA_U32_SEL]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700632 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (n == NULL)
634 return -ENOBUFS;
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636#ifdef CONFIG_CLS_U32_PERF
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700637 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 if (n->pf == NULL) {
639 kfree(n);
640 return -ENOBUFS;
641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642#endif
643
644 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
645 n->ht_up = ht;
646 n->handle = handle;
Radu Rendecb2268012007-11-10 21:54:50 -0800647 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649#ifdef CONFIG_CLS_U32_MARK
Patrick McHardyadd93b62008-01-22 22:11:33 -0800650 if (tb[TCA_U32_MARK]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 struct tc_u32_mark *mark;
652
Patrick McHardyadd93b62008-01-22 22:11:33 -0800653 mark = nla_data(tb[TCA_U32_MARK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
655 n->mark.success = 0;
656 }
657#endif
658
Patrick McHardyadd93b62008-01-22 22:11:33 -0800659 err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 if (err == 0) {
661 struct tc_u_knode **ins;
662 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
663 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
664 break;
665
666 n->next = *ins;
Jarek Poplawski6f573212009-01-05 18:14:19 -0800667 tcf_tree_lock(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 *ins = n;
Jarek Poplawski6f573212009-01-05 18:14:19 -0800669 tcf_tree_unlock(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 *arg = (unsigned long)n;
672 return 0;
673 }
674#ifdef CONFIG_CLS_U32_PERF
Patrick McHardy1ae39a42006-03-23 01:16:48 -0800675 kfree(n->pf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676#endif
677 kfree(n);
678 return err;
679}
680
681static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
682{
683 struct tc_u_common *tp_c = tp->data;
684 struct tc_u_hnode *ht;
685 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000686 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 if (arg->stop)
689 return;
690
691 for (ht = tp_c->hlist; ht; ht = ht->next) {
692 if (ht->prio != tp->prio)
693 continue;
694 if (arg->count >= arg->skip) {
695 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
696 arg->stop = 1;
697 return;
698 }
699 }
700 arg->count++;
701 for (h = 0; h <= ht->divisor; h++) {
702 for (n = ht->ht[h]; n; n = n->next) {
703 if (arg->count < arg->skip) {
704 arg->count++;
705 continue;
706 }
707 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
708 arg->stop = 1;
709 return;
710 }
711 arg->count++;
712 }
713 }
714 }
715}
716
717static int u32_dump(struct tcf_proto *tp, unsigned long fh,
718 struct sk_buff *skb, struct tcmsg *t)
719{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000720 struct tc_u_knode *n = (struct tc_u_knode *)fh;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800721 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723 if (n == NULL)
724 return skb->len;
725
726 t->tcm_handle = n->handle;
727
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800728 nest = nla_nest_start(skb, TCA_OPTIONS);
729 if (nest == NULL)
730 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 if (TC_U32_KEY(n->handle) == 0) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000733 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
734 u32 divisor = ht->divisor + 1;
735
Patrick McHardy24beeab2008-01-23 20:34:48 -0800736 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 } else {
Patrick McHardyadd93b62008-01-22 22:11:33 -0800738 NLA_PUT(skb, TCA_U32_SEL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
740 &n->sel);
741 if (n->ht_up) {
742 u32 htid = n->handle & 0xFFFFF000;
Patrick McHardy24beeab2008-01-23 20:34:48 -0800743 NLA_PUT_U32(skb, TCA_U32_HASH, htid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 }
745 if (n->res.classid)
Patrick McHardy24beeab2008-01-23 20:34:48 -0800746 NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (n->ht_down)
Patrick McHardy24beeab2008-01-23 20:34:48 -0800748 NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750#ifdef CONFIG_CLS_U32_MARK
751 if (n->mark.val || n->mark.mask)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800752 NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753#endif
754
755 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800756 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758#ifdef CONFIG_NET_CLS_IND
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000759 if (strlen(n->indev))
Patrick McHardy57e1c482008-01-23 20:34:28 -0800760 NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761#endif
762#ifdef CONFIG_CLS_U32_PERF
Patrick McHardyadd93b62008-01-22 22:11:33 -0800763 NLA_PUT(skb, TCA_U32_PCNT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
765 n->pf);
766#endif
767 }
768
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800769 nla_nest_end(skb, nest);
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 if (TC_U32_KEY(n->handle))
772 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800773 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 return skb->len;
775
Patrick McHardyadd93b62008-01-22 22:11:33 -0800776nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800777 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 return -1;
779}
780
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800781static struct tcf_proto_ops cls_u32_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 .kind = "u32",
783 .classify = u32_classify,
784 .init = u32_init,
785 .destroy = u32_destroy,
786 .get = u32_get,
787 .put = u32_put,
788 .change = u32_change,
789 .delete = u32_delete,
790 .walk = u32_walk,
791 .dump = u32_dump,
792 .owner = THIS_MODULE,
793};
794
795static int __init init_u32(void)
796{
stephen hemminger6ff9c362010-05-12 06:37:05 +0000797 pr_info("u32 classifier\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798#ifdef CONFIG_CLS_U32_PERF
stephen hemminger6ff9c362010-05-12 06:37:05 +0000799 pr_info(" Performance counters on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801#ifdef CONFIG_NET_CLS_IND
stephen hemminger6ff9c362010-05-12 06:37:05 +0000802 pr_info(" input device check on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803#endif
804#ifdef CONFIG_NET_CLS_ACT
stephen hemminger6ff9c362010-05-12 06:37:05 +0000805 pr_info(" Actions configured\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806#endif
807 return register_tcf_proto_ops(&cls_u32_ops);
808}
809
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900810static void __exit exit_u32(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
812 unregister_tcf_proto_ops(&cls_u32_ops);
813}
814
815module_init(init_u32)
816module_exit(exit_u32)
817MODULE_LICENSE("GPL");