blob: 84c28daff8484f643e5bed4176f6b225eec34e66 [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
WANG Cong2519a602014-01-09 16:14:02 -080051 int ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#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
Eric Dumazetcc7ec452011-01-19 19:26:56 +000082static inline unsigned int u32_hash_fold(__be32 key,
83 const struct tc_u32_sel *sel,
84 u8 fshift)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Eric Dumazetcc7ec452011-01-19 19:26:56 +000086 unsigned int h = ntohl(key & sel->hmask) >> fshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 return h;
89}
90
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000091static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 struct {
94 struct tc_u_knode *knode;
Changli Gaofbc2e7d2010-06-02 07:32:42 -070095 unsigned int off;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 } stack[TC_U32_MAXDEPTH];
97
WANG Conga8701a62014-01-09 16:14:03 -080098 struct tc_u_hnode *ht = tp->root;
Changli Gaofbc2e7d2010-06-02 07:32:42 -070099 unsigned int off = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 struct tc_u_knode *n;
101 int sdepth = 0;
102 int off2 = 0;
103 int sel = 0;
104#ifdef CONFIG_CLS_U32_PERF
105 int j;
106#endif
107 int i, r;
108
109next_ht:
110 n = ht->ht[sel];
111
112next_knode:
113 if (n) {
114 struct tc_u32_key *key = n->sel.keys;
115
116#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000117 n->pf->rcnt += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 j = 0;
119#endif
120
121#ifdef CONFIG_CLS_U32_MARK
Thomas Graf82e91ff2006-11-09 15:19:14 -0800122 if ((skb->mark & n->mark.mask) != n->mark.val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 n = n->next;
124 goto next_knode;
125 } else {
126 n->mark.success++;
127 }
128#endif
129
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000130 for (i = n->sel.nkeys; i > 0; i--, key++) {
stephen hemminger66d50d22010-08-02 13:44:13 +0000131 int toff = off + key->off + (off2 & key->offmask);
stephen hemminger86fce3b2011-02-20 16:14:23 +0000132 __be32 *data, hdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Dan Carpenter4e18b3e2010-10-04 02:28:36 +0000134 if (skb_headroom(skb) + toff > INT_MAX)
stephen hemminger66d50d22010-08-02 13:44:13 +0000135 goto out;
136
stephen hemminger86fce3b2011-02-20 16:14:23 +0000137 data = skb_header_pointer(skb, toff, 4, &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700138 if (!data)
139 goto out;
140 if ((*data ^ key->val) & key->mask) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 n = n->next;
142 goto next_knode;
143 }
144#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000145 n->pf->kcnts[j] += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 j++;
147#endif
148 }
149 if (n->ht_down == NULL) {
150check_terminal:
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000151 if (n->sel.flags & TC_U32_TERMINAL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 *res = n->res;
154#ifdef CONFIG_NET_CLS_IND
WANG Cong2519a602014-01-09 16:14:02 -0800155 if (!tcf_match_indev(skb, n->ifindex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 n = n->next;
157 goto next_knode;
158 }
159#endif
160#ifdef CONFIG_CLS_U32_PERF
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000161 n->pf->rhit += 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162#endif
163 r = tcf_exts_exec(skb, &n->exts, res);
164 if (r < 0) {
165 n = n->next;
166 goto next_knode;
167 }
168
169 return r;
170 }
171 n = n->next;
172 goto next_knode;
173 }
174
175 /* PUSH */
176 if (sdepth >= TC_U32_MAXDEPTH)
177 goto deadloop;
178 stack[sdepth].knode = n;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700179 stack[sdepth].off = off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 sdepth++;
181
182 ht = n->ht_down;
183 sel = 0;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700184 if (ht->divisor) {
stephen hemminger86fce3b2011-02-20 16:14:23 +0000185 __be32 *data, hdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700187 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
stephen hemminger86fce3b2011-02-20 16:14:23 +0000188 &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700189 if (!data)
190 goto out;
191 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
192 n->fshift);
193 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000194 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 goto next_ht;
196
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000197 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 off2 = n->sel.off + 3;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700199 if (n->sel.flags & TC_U32_VAROFFSET) {
stephen hemminger86fce3b2011-02-20 16:14:23 +0000200 __be16 *data, hdata;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700201
202 data = skb_header_pointer(skb,
203 off + n->sel.offoff,
stephen hemminger86fce3b2011-02-20 16:14:23 +0000204 2, &hdata);
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700205 if (!data)
206 goto out;
207 off2 += ntohs(n->sel.offmask & *data) >>
208 n->sel.offshift;
209 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 off2 &= ~3;
211 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000212 if (n->sel.flags & TC_U32_EAT) {
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700213 off += off2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 off2 = 0;
215 }
216
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700217 if (off < skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 goto next_ht;
219 }
220
221 /* POP */
222 if (sdepth--) {
223 n = stack[sdepth].knode;
224 ht = n->ht_up;
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700225 off = stack[sdepth].off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 goto check_terminal;
227 }
Changli Gaofbc2e7d2010-06-02 07:32:42 -0700228out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return -1;
230
231deadloop:
Joe Perchese87cc472012-05-13 21:56:26 +0000232 net_warn_ratelimited("cls_u32: dead loop\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -1;
234}
235
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000236static struct tc_u_hnode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
238{
239 struct tc_u_hnode *ht;
240
241 for (ht = tp_c->hlist; ht; ht = ht->next)
242 if (ht->handle == handle)
243 break;
244
245 return ht;
246}
247
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000248static struct tc_u_knode *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
250{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000251 unsigned int sel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 struct tc_u_knode *n = NULL;
253
254 sel = TC_U32_HASH(handle);
255 if (sel > ht->divisor)
256 goto out;
257
258 for (n = ht->ht[sel]; n; n = n->next)
259 if (n->handle == handle)
260 break;
261out:
262 return n;
263}
264
265
266static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
267{
268 struct tc_u_hnode *ht;
269 struct tc_u_common *tp_c = tp->data;
270
271 if (TC_U32_HTID(handle) == TC_U32_ROOT)
272 ht = tp->root;
273 else
274 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
275
276 if (!ht)
277 return 0;
278
279 if (TC_U32_KEY(handle) == 0)
280 return (unsigned long)ht;
281
282 return (unsigned long)u32_lookup_key(ht, handle);
283}
284
285static void u32_put(struct tcf_proto *tp, unsigned long f)
286{
287}
288
289static u32 gen_new_htid(struct tc_u_common *tp_c)
290{
291 int i = 0x800;
292
293 do {
294 if (++tp_c->hgenerator == 0x7FF)
295 tp_c->hgenerator = 1;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000296 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
299}
300
301static int u32_init(struct tcf_proto *tp)
302{
303 struct tc_u_hnode *root_ht;
304 struct tc_u_common *tp_c;
305
David S. Miller72b25a92008-07-18 20:54:17 -0700306 tp_c = tp->q->u32_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700308 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (root_ht == NULL)
310 return -ENOBUFS;
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 root_ht->divisor = 0;
313 root_ht->refcnt++;
314 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
315 root_ht->prio = tp->prio;
316
317 if (tp_c == NULL) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700318 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (tp_c == NULL) {
320 kfree(root_ht);
321 return -ENOBUFS;
322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 tp_c->q = tp->q;
David S. Miller72b25a92008-07-18 20:54:17 -0700324 tp->q->u32_node = tp_c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
326
327 tp_c->refcnt++;
328 root_ht->next = tp_c->hlist;
329 tp_c->hlist = root_ht;
330 root_ht->tp_c = tp_c;
331
332 tp->root = root_ht;
333 tp->data = tp_c;
334 return 0;
335}
336
337static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
338{
339 tcf_unbind_filter(tp, &n->res);
340 tcf_exts_destroy(tp, &n->exts);
341 if (n->ht_down)
342 n->ht_down->refcnt--;
343#ifdef CONFIG_CLS_U32_PERF
Patrick McHardy1ae39a42006-03-23 01:16:48 -0800344 kfree(n->pf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345#endif
346 kfree(n);
347 return 0;
348}
349
Yang Yingliang82d567c2013-12-10 20:55:31 +0800350static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
352 struct tc_u_knode **kp;
353 struct tc_u_hnode *ht = key->ht_up;
354
355 if (ht) {
356 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
357 if (*kp == key) {
358 tcf_tree_lock(tp);
359 *kp = key->next;
360 tcf_tree_unlock(tp);
361
362 u32_destroy_key(tp, key);
363 return 0;
364 }
365 }
366 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700367 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return 0;
369}
370
371static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
372{
373 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000374 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000376 for (h = 0; h <= ht->divisor; h++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 while ((n = ht->ht[h]) != NULL) {
378 ht->ht[h] = n->next;
379
380 u32_destroy_key(tp, n);
381 }
382 }
383}
384
385static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
386{
387 struct tc_u_common *tp_c = tp->data;
388 struct tc_u_hnode **hn;
389
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700390 WARN_ON(ht->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 u32_clear_hnode(tp, ht);
393
394 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
395 if (*hn == ht) {
396 *hn = ht->next;
397 kfree(ht);
398 return 0;
399 }
400 }
401
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700402 WARN_ON(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 return -ENOENT;
404}
405
406static void u32_destroy(struct tcf_proto *tp)
407{
408 struct tc_u_common *tp_c = tp->data;
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000409 struct tc_u_hnode *root_ht = tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700411 WARN_ON(root_ht == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413 if (root_ht && --root_ht->refcnt == 0)
414 u32_destroy_hnode(tp, root_ht);
415
416 if (--tp_c->refcnt == 0) {
417 struct tc_u_hnode *ht;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
David S. Miller72b25a92008-07-18 20:54:17 -0700419 tp->q->u32_node = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700421 for (ht = tp_c->hlist; ht; ht = ht->next) {
422 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 u32_clear_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426 while ((ht = tp_c->hlist) != NULL) {
427 tp_c->hlist = ht->next;
428
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700429 WARN_ON(ht->refcnt != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 kfree(ht);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 kfree(tp_c);
435 }
436
437 tp->data = NULL;
438}
439
440static int u32_delete(struct tcf_proto *tp, unsigned long arg)
441{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000442 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 if (ht == NULL)
445 return 0;
446
447 if (TC_U32_KEY(ht->handle))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000448 return u32_delete_key(tp, (struct tc_u_knode *)ht);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 if (tp->root == ht)
451 return -EINVAL;
452
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700453 if (ht->refcnt == 1) {
454 ht->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 u32_destroy_hnode(tp, ht);
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700456 } else {
457 return -EBUSY;
458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 return 0;
461}
462
463static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
464{
465 struct tc_u_knode *n;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000466 unsigned int i = 0x7FF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000468 for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 if (i < TC_U32_NODE(n->handle))
470 i = TC_U32_NODE(n->handle);
471 i++;
472
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000473 return handle | (i > 0xFFF ? 0xFFF : i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
475
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800476static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
477 [TCA_U32_CLASSID] = { .type = NLA_U32 },
478 [TCA_U32_HASH] = { .type = NLA_U32 },
479 [TCA_U32_LINK] = { .type = NLA_U32 },
480 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
481 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
482 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
483 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
484};
485
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000486static int u32_set_parms(struct net *net, struct tcf_proto *tp,
487 unsigned long base, struct tc_u_hnode *ht,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800488 struct tc_u_knode *n, struct nlattr **tb,
489 struct nlattr *est)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 int err;
492 struct tcf_exts e;
493
WANG Cong5da57f42013-12-15 20:15:07 -0800494 tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
495 err = tcf_exts_validate(net, tp, tb, est, &e);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (err < 0)
497 return err;
498
499 err = -EINVAL;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800500 if (tb[TCA_U32_LINK]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800501 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000502 struct tc_u_hnode *ht_down = NULL, *ht_old;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 if (TC_U32_KEY(handle))
505 goto errout;
506
507 if (handle) {
508 ht_down = u32_lookup_ht(ht->tp_c, handle);
509
510 if (ht_down == NULL)
511 goto errout;
512 ht_down->refcnt++;
513 }
514
515 tcf_tree_lock(tp);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000516 ht_old = n->ht_down;
517 n->ht_down = ht_down;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 tcf_tree_unlock(tp);
519
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000520 if (ht_old)
521 ht_old->refcnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 }
Patrick McHardyadd93b62008-01-22 22:11:33 -0800523 if (tb[TCA_U32_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800524 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 tcf_bind_filter(tp, &n->res, base);
526 }
527
528#ifdef CONFIG_NET_CLS_IND
Patrick McHardyadd93b62008-01-22 22:11:33 -0800529 if (tb[TCA_U32_INDEV]) {
WANG Cong2519a602014-01-09 16:14:02 -0800530 int ret;
531 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
532 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 goto errout;
WANG Cong2519a602014-01-09 16:14:02 -0800534 n->ifindex = ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 }
536#endif
537 tcf_exts_change(tp, &n->exts, &e);
538
539 return 0;
540errout:
541 tcf_exts_destroy(tp, &e);
542 return err;
543}
544
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000545static int u32_change(struct net *net, struct sk_buff *in_skb,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600546 struct tcf_proto *tp, unsigned long base, u32 handle,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800547 struct nlattr **tca,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 unsigned long *arg)
549{
550 struct tc_u_common *tp_c = tp->data;
551 struct tc_u_hnode *ht;
552 struct tc_u_knode *n;
553 struct tc_u32_sel *s;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800554 struct nlattr *opt = tca[TCA_OPTIONS];
555 struct nlattr *tb[TCA_U32_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 u32 htid;
557 int err;
558
559 if (opt == NULL)
560 return handle ? -EINVAL : 0;
561
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800562 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800563 if (err < 0)
564 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000566 n = (struct tc_u_knode *)*arg;
567 if (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if (TC_U32_KEY(n->handle) == 0)
569 return -EINVAL;
570
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000571 return u32_set_parms(net, tp, base, n->ht_up, n, tb,
572 tca[TCA_RATE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 }
574
Patrick McHardyadd93b62008-01-22 22:11:33 -0800575 if (tb[TCA_U32_DIVISOR]) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000576 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 if (--divisor > 0x100)
579 return -EINVAL;
580 if (TC_U32_KEY(handle))
581 return -EINVAL;
582 if (handle == 0) {
583 handle = gen_new_htid(tp->data);
584 if (handle == 0)
585 return -ENOMEM;
586 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000587 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (ht == NULL)
589 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 ht->tp_c = tp_c;
Jarek Poplawskie56cfad2008-04-12 18:37:13 -0700591 ht->refcnt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 ht->divisor = divisor;
593 ht->handle = handle;
594 ht->prio = tp->prio;
595 ht->next = tp_c->hlist;
596 tp_c->hlist = ht;
597 *arg = (unsigned long)ht;
598 return 0;
599 }
600
Patrick McHardyadd93b62008-01-22 22:11:33 -0800601 if (tb[TCA_U32_HASH]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800602 htid = nla_get_u32(tb[TCA_U32_HASH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
604 ht = tp->root;
605 htid = ht->handle;
606 } else {
607 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
608 if (ht == NULL)
609 return -EINVAL;
610 }
611 } else {
612 ht = tp->root;
613 htid = ht->handle;
614 }
615
616 if (ht->divisor < TC_U32_HASH(htid))
617 return -EINVAL;
618
619 if (handle) {
620 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
621 return -EINVAL;
622 handle = htid | TC_U32_NODE(handle);
623 } else
624 handle = gen_new_kid(ht, htid);
625
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800626 if (tb[TCA_U32_SEL] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 return -EINVAL;
628
Patrick McHardyadd93b62008-01-22 22:11:33 -0800629 s = nla_data(tb[TCA_U32_SEL]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700631 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (n == NULL)
633 return -ENOBUFS;
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635#ifdef CONFIG_CLS_U32_PERF
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700636 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (n->pf == NULL) {
638 kfree(n);
639 return -ENOBUFS;
640 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641#endif
642
643 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
644 n->ht_up = ht;
645 n->handle = handle;
Radu Rendecb2268012007-11-10 21:54:50 -0800646 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
WANG Cong5da57f42013-12-15 20:15:07 -0800647 tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
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
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000659 err = u32_set_parms(net, 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
WANG Cong832d1d52014-01-09 16:14:01 -0800717static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 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
David S. Miller1b34ec42012-03-29 05:11:39 -0400736 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
737 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 } else {
David S. Miller1b34ec42012-03-29 05:11:39 -0400739 if (nla_put(skb, TCA_U32_SEL,
740 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
741 &n->sel))
742 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (n->ht_up) {
744 u32 htid = n->handle & 0xFFFFF000;
David S. Miller1b34ec42012-03-29 05:11:39 -0400745 if (nla_put_u32(skb, TCA_U32_HASH, htid))
746 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400748 if (n->res.classid &&
749 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
750 goto nla_put_failure;
751 if (n->ht_down &&
752 nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
753 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755#ifdef CONFIG_CLS_U32_MARK
David S. Miller1b34ec42012-03-29 05:11:39 -0400756 if ((n->mark.val || n->mark.mask) &&
757 nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
758 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759#endif
760
WANG Cong5da57f42013-12-15 20:15:07 -0800761 if (tcf_exts_dump(skb, &n->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800762 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764#ifdef CONFIG_NET_CLS_IND
WANG Cong2519a602014-01-09 16:14:02 -0800765 if (n->ifindex) {
766 struct net_device *dev;
767 dev = __dev_get_by_index(net, n->ifindex);
768 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
769 goto nla_put_failure;
770 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771#endif
772#ifdef CONFIG_CLS_U32_PERF
David S. Miller1b34ec42012-03-29 05:11:39 -0400773 if (nla_put(skb, TCA_U32_PCNT,
774 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
775 n->pf))
776 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777#endif
778 }
779
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800780 nla_nest_end(skb, nest);
781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 if (TC_U32_KEY(n->handle))
WANG Cong5da57f42013-12-15 20:15:07 -0800783 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800784 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 return skb->len;
786
Patrick McHardyadd93b62008-01-22 22:11:33 -0800787nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800788 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 return -1;
790}
791
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800792static struct tcf_proto_ops cls_u32_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 .kind = "u32",
794 .classify = u32_classify,
795 .init = u32_init,
796 .destroy = u32_destroy,
797 .get = u32_get,
798 .put = u32_put,
799 .change = u32_change,
800 .delete = u32_delete,
801 .walk = u32_walk,
802 .dump = u32_dump,
803 .owner = THIS_MODULE,
804};
805
806static int __init init_u32(void)
807{
stephen hemminger6ff9c362010-05-12 06:37:05 +0000808 pr_info("u32 classifier\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809#ifdef CONFIG_CLS_U32_PERF
stephen hemminger6ff9c362010-05-12 06:37:05 +0000810 pr_info(" Performance counters on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812#ifdef CONFIG_NET_CLS_IND
stephen hemminger6ff9c362010-05-12 06:37:05 +0000813 pr_info(" input device check on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814#endif
815#ifdef CONFIG_NET_CLS_ACT
stephen hemminger6ff9c362010-05-12 06:37:05 +0000816 pr_info(" Actions configured\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817#endif
818 return register_tcf_proto_ops(&cls_u32_ops);
819}
820
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900821static void __exit exit_u32(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822{
823 unregister_tcf_proto_ops(&cls_u32_ops);
824}
825
826module_init(init_u32)
827module_exit(exit_u32)
828MODULE_LICENSE("GPL");