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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/em_meta.c Metadata ematch
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: Thomas Graf <tgraf@suug.ch>
10 *
11 * ==========================================================================
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090012 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * The metadata ematch compares two meta objects where each object
14 * represents either a meta value stored in the kernel or a static
15 * value provided by userspace. The objects are not provided by
16 * userspace itself but rather a definition providing the information
17 * to build them. Every object is of a certain type which must be
18 * equal to the object it is being compared to.
19 *
20 * The definition of a objects conists of the type (meta type), a
21 * identifier (meta id) and additional type specific information.
22 * The meta id is either TCF_META_TYPE_VALUE for values provided by
23 * userspace or a index to the meta operations table consisting of
24 * function pointers to type specific meta data collectors returning
25 * the value of the requested meta value.
26 *
27 * lvalue rvalue
28 * +-----------+ +-----------+
29 * | type: INT | | type: INT |
David S. Miller261688d2005-07-22 14:43:52 -070030 * def | id: DEV | | id: VALUE |
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
David S. Miller261688d2005-07-22 14:43:52 -070034 * ---> meta_ops[INT][DEV](...) |
Thomas Graf48900622005-06-08 15:10:48 -070035 * | |
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
David S. Miller261688d2005-07-22 14:43:52 -070040 * obj | id: DEV | | id: VALUE |
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * | data: 2 |<--data got filled out | data: 3 |
42 * +-----------+ +-----------+
43 * | |
44 * --------------> 2 equals 3 <--------------
45 *
46 * This is a simplified schema, the complexity varies depending
47 * on the meta type. Obviously, the length of the data must also
48 * be provided for non-numeric types.
49 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -030050 * Additionally, type dependent modifiers such as shift operators
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 * or mask may be applied to extend the functionaliy. As of now,
52 * the variable length type supports shifting the byte string to
53 * the right, eating up any number of octets and thus supporting
54 * wildcard interface name comparisons such as "ppp%" matching
55 * ppp0..9.
56 *
57 * NOTE: Certain meta values depend on other subsystems and are
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +020058 * only available if that subsystem is enabled in the kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 */
60
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090061#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/module.h>
63#include <linux/types.h>
64#include <linux/kernel.h>
65#include <linux/sched.h>
66#include <linux/string.h>
67#include <linux/skbuff.h>
68#include <linux/random.h>
Stephen Hemminger3113e882008-02-05 03:20:13 -080069#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/tc_ematch/tc_em_meta.h>
71#include <net/dst.h>
72#include <net/route.h>
73#include <net/pkt_cls.h>
Thomas Graf48900622005-06-08 15:10:48 -070074#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Eric Dumazetcc7ec452011-01-19 19:26:56 +000076struct meta_obj {
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 unsigned long value;
78 unsigned int len;
79};
80
Eric Dumazetcc7ec452011-01-19 19:26:56 +000081struct meta_value {
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 struct tcf_meta_val hdr;
83 unsigned long val;
84 unsigned int len;
85};
86
Eric Dumazetcc7ec452011-01-19 19:26:56 +000087struct meta_match {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 struct meta_value lvalue;
89 struct meta_value rvalue;
90};
91
92static inline int meta_id(struct meta_value *v)
93{
94 return TCF_META_ID(v->hdr.kind);
95}
96
97static inline int meta_type(struct meta_value *v)
98{
99 return TCF_META_TYPE(v->hdr.kind);
100}
101
102#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
103 struct tcf_pkt_info *info, struct meta_value *v, \
104 struct meta_obj *dst, int *err)
105
106/**************************************************************************
107 * System status & misc
108 **************************************************************************/
109
110META_COLLECTOR(int_random)
111{
112 get_random_bytes(&dst->value, sizeof(dst->value));
113}
114
115static inline unsigned long fixed_loadavg(int load)
116{
117 int rnd_load = load + (FIXED_1/200);
118 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
119
120 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
121}
122
123META_COLLECTOR(int_loadavg_0)
124{
125 dst->value = fixed_loadavg(avenrun[0]);
126}
127
128META_COLLECTOR(int_loadavg_1)
129{
130 dst->value = fixed_loadavg(avenrun[1]);
131}
132
133META_COLLECTOR(int_loadavg_2)
134{
135 dst->value = fixed_loadavg(avenrun[2]);
136}
137
138/**************************************************************************
139 * Device names & indices
140 **************************************************************************/
141
142static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
143{
144 if (unlikely(dev == NULL))
145 return -1;
146
147 dst->value = dev->ifindex;
148 return 0;
149}
150
151static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
152{
153 if (unlikely(dev == NULL))
154 return -1;
155
156 dst->value = (unsigned long) dev->name;
157 dst->len = strlen(dev->name);
158 return 0;
159}
160
161META_COLLECTOR(int_dev)
162{
163 *err = int_dev(skb->dev, dst);
164}
165
166META_COLLECTOR(var_dev)
167{
168 *err = var_dev(skb->dev, dst);
169}
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/**************************************************************************
Stephen Hemminger3113e882008-02-05 03:20:13 -0800172 * vlan tag
173 **************************************************************************/
174
175META_COLLECTOR(int_vlan_tag)
176{
Stephen Hemminger1a31f202009-04-13 18:12:57 -0700177 unsigned short tag;
178
Jiri Pirkodf8a39d2015-01-13 17:13:44 +0100179 tag = skb_vlan_tag_get(skb);
Stephen Hemminger1a31f202009-04-13 18:12:57 -0700180 if (!tag && __vlan_get_tag(skb, &tag))
Stephen Hemminger3113e882008-02-05 03:20:13 -0800181 *err = -1;
182 else
183 dst->value = tag;
184}
185
186
187
188/**************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 * skb attributes
190 **************************************************************************/
191
192META_COLLECTOR(int_priority)
193{
194 dst->value = skb->priority;
195}
196
197META_COLLECTOR(int_protocol)
198{
199 /* Let userspace take care of the byte ordering */
Jiri Pirkod8b96052015-01-13 17:13:43 +0100200 dst->value = tc_skb_protocol(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203META_COLLECTOR(int_pkttype)
204{
205 dst->value = skb->pkt_type;
206}
207
208META_COLLECTOR(int_pktlen)
209{
210 dst->value = skb->len;
211}
212
213META_COLLECTOR(int_datalen)
214{
215 dst->value = skb->data_len;
216}
217
218META_COLLECTOR(int_maclen)
219{
220 dst->value = skb->mac_len;
221}
222
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700223META_COLLECTOR(int_rxhash)
224{
Tom Herbert3958afa1b2013-12-15 22:12:06 -0800225 dst->value = skb_get_hash(skb);
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228/**************************************************************************
229 * Netfilter
230 **************************************************************************/
231
Thomas Graf82e91ff2006-11-09 15:19:14 -0800232META_COLLECTOR(int_mark)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
Thomas Graf82e91ff2006-11-09 15:19:14 -0800234 dst->value = skb->mark;
Patrick McHardy7686ee12005-07-24 19:44:23 -0700235}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237/**************************************************************************
238 * Traffic Control
239 **************************************************************************/
240
241META_COLLECTOR(int_tcindex)
242{
243 dst->value = skb->tc_index;
244}
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246/**************************************************************************
247 * Routing
248 **************************************************************************/
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250META_COLLECTOR(int_rtclassid)
251{
Eric Dumazetadf30902009-06-02 05:19:30 +0000252 if (unlikely(skb_dst(skb) == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 *err = -1;
254 else
Patrick McHardyc7066f72011-01-14 13:36:42 +0100255#ifdef CONFIG_IP_ROUTE_CLASSID
Eric Dumazetadf30902009-06-02 05:19:30 +0000256 dst->value = skb_dst(skb)->tclassid;
Patrick McHardy7686ee12005-07-24 19:44:23 -0700257#else
258 dst->value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259#endif
Patrick McHardy7686ee12005-07-24 19:44:23 -0700260}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262META_COLLECTOR(int_rtiif)
263{
Eric Dumazet511c3f92009-06-02 05:14:27 +0000264 if (unlikely(skb_rtable(skb) == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 *err = -1;
266 else
David S. Miller92101b32012-07-23 16:29:00 -0700267 dst->value = inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
270/**************************************************************************
Thomas Graf48900622005-06-08 15:10:48 -0700271 * Socket Attributes
272 **************************************************************************/
273
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800274#define skip_nonlocal(skb) \
275 (unlikely(skb->sk == NULL))
Thomas Graf48900622005-06-08 15:10:48 -0700276
277META_COLLECTOR(int_sk_family)
278{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800279 if (skip_nonlocal(skb)) {
280 *err = -1;
281 return;
282 }
Thomas Graf48900622005-06-08 15:10:48 -0700283 dst->value = skb->sk->sk_family;
284}
285
286META_COLLECTOR(int_sk_state)
287{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800288 if (skip_nonlocal(skb)) {
289 *err = -1;
290 return;
291 }
Thomas Graf48900622005-06-08 15:10:48 -0700292 dst->value = skb->sk->sk_state;
293}
294
295META_COLLECTOR(int_sk_reuse)
296{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800297 if (skip_nonlocal(skb)) {
298 *err = -1;
299 return;
300 }
Thomas Graf48900622005-06-08 15:10:48 -0700301 dst->value = skb->sk->sk_reuse;
302}
303
304META_COLLECTOR(int_sk_bound_if)
305{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800306 if (skip_nonlocal(skb)) {
307 *err = -1;
308 return;
309 }
Thomas Graf48900622005-06-08 15:10:48 -0700310 /* No error if bound_dev_if is 0, legal userspace check */
311 dst->value = skb->sk->sk_bound_dev_if;
312}
313
314META_COLLECTOR(var_sk_bound_if)
315{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800316 if (skip_nonlocal(skb)) {
317 *err = -1;
318 return;
319 }
Thomas Graf48900622005-06-08 15:10:48 -0700320
Eric Dumazetd0075632009-11-04 05:23:31 -0800321 if (skb->sk->sk_bound_dev_if == 0) {
Thomas Graf48900622005-06-08 15:10:48 -0700322 dst->value = (unsigned long) "any";
323 dst->len = 3;
Eric Dumazetd0075632009-11-04 05:23:31 -0800324 } else {
Thomas Graf48900622005-06-08 15:10:48 -0700325 struct net_device *dev;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900326
Eric Dumazetd0075632009-11-04 05:23:31 -0800327 rcu_read_lock();
Eric Dumazet2939e272009-11-18 23:24:41 -0800328 dev = dev_get_by_index_rcu(sock_net(skb->sk),
329 skb->sk->sk_bound_dev_if);
Thomas Graf48900622005-06-08 15:10:48 -0700330 *err = var_dev(dev, dst);
Eric Dumazetd0075632009-11-04 05:23:31 -0800331 rcu_read_unlock();
332 }
Thomas Graf48900622005-06-08 15:10:48 -0700333}
334
335META_COLLECTOR(int_sk_refcnt)
336{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800337 if (skip_nonlocal(skb)) {
338 *err = -1;
339 return;
340 }
Thomas Graf48900622005-06-08 15:10:48 -0700341 dst->value = atomic_read(&skb->sk->sk_refcnt);
342}
343
344META_COLLECTOR(int_sk_rcvbuf)
345{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800346 const struct sock *sk = skb_to_full_sk(skb);
347
348 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800349 *err = -1;
350 return;
351 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800352 dst->value = sk->sk_rcvbuf;
Thomas Graf48900622005-06-08 15:10:48 -0700353}
354
355META_COLLECTOR(int_sk_shutdown)
356{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800357 const struct sock *sk = skb_to_full_sk(skb);
358
359 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800360 *err = -1;
361 return;
362 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800363 dst->value = sk->sk_shutdown;
Thomas Graf48900622005-06-08 15:10:48 -0700364}
365
366META_COLLECTOR(int_sk_proto)
367{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800368 const struct sock *sk = skb_to_full_sk(skb);
369
370 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800371 *err = -1;
372 return;
373 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800374 dst->value = sk->sk_protocol;
Thomas Graf48900622005-06-08 15:10:48 -0700375}
376
377META_COLLECTOR(int_sk_type)
378{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800379 const struct sock *sk = skb_to_full_sk(skb);
380
381 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800382 *err = -1;
383 return;
384 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800385 dst->value = sk->sk_type;
Thomas Graf48900622005-06-08 15:10:48 -0700386}
387
388META_COLLECTOR(int_sk_rmem_alloc)
389{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800390 const struct sock *sk = skb_to_full_sk(skb);
391
392 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800393 *err = -1;
394 return;
395 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800396 dst->value = sk_rmem_alloc_get(sk);
Thomas Graf48900622005-06-08 15:10:48 -0700397}
398
399META_COLLECTOR(int_sk_wmem_alloc)
400{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800401 const struct sock *sk = skb_to_full_sk(skb);
402
403 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800404 *err = -1;
405 return;
406 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800407 dst->value = sk_wmem_alloc_get(sk);
Thomas Graf48900622005-06-08 15:10:48 -0700408}
409
410META_COLLECTOR(int_sk_omem_alloc)
411{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800412 const struct sock *sk = skb_to_full_sk(skb);
413
414 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800415 *err = -1;
416 return;
417 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800418 dst->value = atomic_read(&sk->sk_omem_alloc);
Thomas Graf48900622005-06-08 15:10:48 -0700419}
420
421META_COLLECTOR(int_sk_rcv_qlen)
422{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800423 const struct sock *sk = skb_to_full_sk(skb);
424
425 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800426 *err = -1;
427 return;
428 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800429 dst->value = sk->sk_receive_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700430}
431
432META_COLLECTOR(int_sk_snd_qlen)
433{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800434 const struct sock *sk = skb_to_full_sk(skb);
435
436 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800437 *err = -1;
438 return;
439 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800440 dst->value = sk->sk_write_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700441}
442
443META_COLLECTOR(int_sk_wmem_queued)
444{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800445 const struct sock *sk = skb_to_full_sk(skb);
446
447 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800448 *err = -1;
449 return;
450 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800451 dst->value = sk->sk_wmem_queued;
Thomas Graf48900622005-06-08 15:10:48 -0700452}
453
454META_COLLECTOR(int_sk_fwd_alloc)
455{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800456 const struct sock *sk = skb_to_full_sk(skb);
457
458 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800459 *err = -1;
460 return;
461 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800462 dst->value = sk->sk_forward_alloc;
Thomas Graf48900622005-06-08 15:10:48 -0700463}
464
465META_COLLECTOR(int_sk_sndbuf)
466{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800467 const struct sock *sk = skb_to_full_sk(skb);
468
469 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800470 *err = -1;
471 return;
472 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800473 dst->value = sk->sk_sndbuf;
Thomas Graf48900622005-06-08 15:10:48 -0700474}
475
476META_COLLECTOR(int_sk_alloc)
477{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800478 const struct sock *sk = skb_to_full_sk(skb);
479
480 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800481 *err = -1;
482 return;
483 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800484 dst->value = (__force int) sk->sk_allocation;
Thomas Graf48900622005-06-08 15:10:48 -0700485}
486
Eric Dumazet81c3d542005-10-03 14:13:38 -0700487META_COLLECTOR(int_sk_hash)
Thomas Graf48900622005-06-08 15:10:48 -0700488{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800489 if (skip_nonlocal(skb)) {
490 *err = -1;
491 return;
492 }
Eric Dumazet81c3d542005-10-03 14:13:38 -0700493 dst->value = skb->sk->sk_hash;
Thomas Graf48900622005-06-08 15:10:48 -0700494}
495
496META_COLLECTOR(int_sk_lingertime)
497{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800498 const struct sock *sk = skb_to_full_sk(skb);
499
500 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800501 *err = -1;
502 return;
503 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800504 dst->value = sk->sk_lingertime / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700505}
506
507META_COLLECTOR(int_sk_err_qlen)
508{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800509 const struct sock *sk = skb_to_full_sk(skb);
510
511 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800512 *err = -1;
513 return;
514 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800515 dst->value = sk->sk_error_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700516}
517
518META_COLLECTOR(int_sk_ack_bl)
519{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800520 const struct sock *sk = skb_to_full_sk(skb);
521
522 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800523 *err = -1;
524 return;
525 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800526 dst->value = sk->sk_ack_backlog;
Thomas Graf48900622005-06-08 15:10:48 -0700527}
528
529META_COLLECTOR(int_sk_max_ack_bl)
530{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800531 const struct sock *sk = skb_to_full_sk(skb);
532
533 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800534 *err = -1;
535 return;
536 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800537 dst->value = sk->sk_max_ack_backlog;
Thomas Graf48900622005-06-08 15:10:48 -0700538}
539
540META_COLLECTOR(int_sk_prio)
541{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800542 const struct sock *sk = skb_to_full_sk(skb);
543
544 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800545 *err = -1;
546 return;
547 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800548 dst->value = sk->sk_priority;
Thomas Graf48900622005-06-08 15:10:48 -0700549}
550
551META_COLLECTOR(int_sk_rcvlowat)
552{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800553 const struct sock *sk = skb_to_full_sk(skb);
554
555 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800556 *err = -1;
557 return;
558 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800559 dst->value = sk->sk_rcvlowat;
Thomas Graf48900622005-06-08 15:10:48 -0700560}
561
562META_COLLECTOR(int_sk_rcvtimeo)
563{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800564 const struct sock *sk = skb_to_full_sk(skb);
565
566 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800567 *err = -1;
568 return;
569 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800570 dst->value = sk->sk_rcvtimeo / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700571}
572
573META_COLLECTOR(int_sk_sndtimeo)
574{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800575 const struct sock *sk = skb_to_full_sk(skb);
576
577 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800578 *err = -1;
579 return;
580 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800581 dst->value = sk->sk_sndtimeo / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700582}
583
584META_COLLECTOR(int_sk_sendmsg_off)
585{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800586 const struct sock *sk = skb_to_full_sk(skb);
587
588 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800589 *err = -1;
590 return;
591 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800592 dst->value = sk->sk_frag.offset;
Thomas Graf48900622005-06-08 15:10:48 -0700593}
594
595META_COLLECTOR(int_sk_write_pend)
596{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800597 const struct sock *sk = skb_to_full_sk(skb);
598
599 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800600 *err = -1;
601 return;
602 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800603 dst->value = sk->sk_write_pending;
Thomas Graf48900622005-06-08 15:10:48 -0700604}
605
606/**************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 * Meta value collectors assignment table
608 **************************************************************************/
609
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000610struct meta_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
612 struct meta_value *, struct meta_obj *, int *);
613};
614
Thomas Graf48900622005-06-08 15:10:48 -0700615#define META_ID(name) TCF_META_ID_##name
616#define META_FUNC(name) { .get = meta_##name }
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618/* Meta value operations table listing all meta value collectors and
619 * assigns them to a type and meta id. */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000620static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 [TCF_META_TYPE_VAR] = {
Thomas Graf48900622005-06-08 15:10:48 -0700622 [META_ID(DEV)] = META_FUNC(var_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700623 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 },
625 [TCF_META_TYPE_INT] = {
Thomas Graf48900622005-06-08 15:10:48 -0700626 [META_ID(RANDOM)] = META_FUNC(int_random),
627 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
628 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
629 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
630 [META_ID(DEV)] = META_FUNC(int_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700631 [META_ID(PRIORITY)] = META_FUNC(int_priority),
632 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
Thomas Graf48900622005-06-08 15:10:48 -0700633 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
634 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
635 [META_ID(DATALEN)] = META_FUNC(int_datalen),
636 [META_ID(MACLEN)] = META_FUNC(int_maclen),
Thomas Graf82e91ff2006-11-09 15:19:14 -0800637 [META_ID(NFMARK)] = META_FUNC(int_mark),
Thomas Graf48900622005-06-08 15:10:48 -0700638 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
Thomas Graf48900622005-06-08 15:10:48 -0700639 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
Thomas Graf48900622005-06-08 15:10:48 -0700640 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
641 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
642 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
643 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
644 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
645 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
646 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
647 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
648 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
649 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
650 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
651 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
652 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
653 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
654 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
655 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
656 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
657 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
658 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
659 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
Eric Dumazet81c3d542005-10-03 14:13:38 -0700660 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
Thomas Graf48900622005-06-08 15:10:48 -0700661 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
662 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
663 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
664 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
665 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
666 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
667 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
668 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
669 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
Stephen Hemminger3113e882008-02-05 03:20:13 -0800670 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700671 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 }
673};
674
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000675static inline struct meta_ops *meta_ops(struct meta_value *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
677 return &__meta_ops[meta_type(val)][meta_id(val)];
678}
679
680/**************************************************************************
681 * Type specific operations for TCF_META_TYPE_VAR
682 **************************************************************************/
683
684static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
685{
686 int r = a->len - b->len;
687
688 if (r == 0)
689 r = memcmp((void *) a->value, (void *) b->value, a->len);
690
691 return r;
692}
693
Patrick McHardyadd93b62008-01-22 22:11:33 -0800694static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800696 int len = nla_len(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Patrick McHardyadd93b62008-01-22 22:11:33 -0800698 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if (dst->val == 0UL)
700 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 dst->len = len;
702 return 0;
703}
704
705static void meta_var_destroy(struct meta_value *v)
706{
Jesper Juhla51482b2005-11-08 09:41:34 -0800707 kfree((void *) v->val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708}
709
710static void meta_var_apply_extras(struct meta_value *v,
711 struct meta_obj *dst)
712{
713 int shift = v->hdr.shift;
714
715 if (shift && shift < dst->len)
716 dst->len -= shift;
717}
718
719static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
720{
David S. Miller1b34ec42012-03-29 05:11:39 -0400721 if (v->val && v->len &&
722 nla_put(skb, tlv, v->len, (void *) v->val))
723 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 return 0;
725
Patrick McHardyadd93b62008-01-22 22:11:33 -0800726nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return -1;
728}
729
730/**************************************************************************
731 * Type specific operations for TCF_META_TYPE_INT
732 **************************************************************************/
733
734static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
735{
736 /* Let gcc optimize it, the unlikely is not really based on
737 * some numbers but jump free code for mismatches seems
738 * more logical. */
Thomas Graf98e56402005-06-08 15:11:19 -0700739 if (unlikely(a->value == b->value))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 return 0;
Thomas Graf98e56402005-06-08 15:11:19 -0700741 else if (a->value < b->value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 return -1;
743 else
744 return 1;
745}
746
Patrick McHardyadd93b62008-01-22 22:11:33 -0800747static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800749 if (nla_len(nla) >= sizeof(unsigned long)) {
750 dst->val = *(unsigned long *) nla_data(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 dst->len = sizeof(unsigned long);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800752 } else if (nla_len(nla) == sizeof(u32)) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800753 dst->val = nla_get_u32(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 dst->len = sizeof(u32);
755 } else
756 return -EINVAL;
757
758 return 0;
759}
760
761static void meta_int_apply_extras(struct meta_value *v,
762 struct meta_obj *dst)
763{
764 if (v->hdr.shift)
765 dst->value >>= v->hdr.shift;
766
767 if (v->val)
768 dst->value &= v->val;
769}
770
771static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
772{
David S. Miller1b34ec42012-03-29 05:11:39 -0400773 if (v->len == sizeof(unsigned long)) {
774 if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
775 goto nla_put_failure;
776 } else if (v->len == sizeof(u32)) {
777 if (nla_put_u32(skb, tlv, v->val))
778 goto nla_put_failure;
779 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
781 return 0;
782
Patrick McHardyadd93b62008-01-22 22:11:33 -0800783nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 return -1;
785}
786
787/**************************************************************************
788 * Type specific operations table
789 **************************************************************************/
790
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000791struct meta_type_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 void (*destroy)(struct meta_value *);
793 int (*compare)(struct meta_obj *, struct meta_obj *);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800794 int (*change)(struct meta_value *, struct nlattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 void (*apply_extras)(struct meta_value *, struct meta_obj *);
796 int (*dump)(struct sk_buff *, struct meta_value *, int);
797};
798
Julia Lawallcfe2f142016-04-09 10:49:22 +0200799static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 [TCF_META_TYPE_VAR] = {
801 .destroy = meta_var_destroy,
802 .compare = meta_var_compare,
803 .change = meta_var_change,
804 .apply_extras = meta_var_apply_extras,
805 .dump = meta_var_dump
806 },
807 [TCF_META_TYPE_INT] = {
808 .compare = meta_int_compare,
809 .change = meta_int_change,
810 .apply_extras = meta_int_apply_extras,
811 .dump = meta_int_dump
812 }
813};
814
Julia Lawallcfe2f142016-04-09 10:49:22 +0200815static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816{
817 return &__meta_type_ops[meta_type(v)];
818}
819
820/**************************************************************************
821 * Core
822 **************************************************************************/
823
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800824static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
825 struct meta_value *v, struct meta_obj *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
827 int err = 0;
828
829 if (meta_id(v) == TCF_META_ID_VALUE) {
830 dst->value = v->val;
831 dst->len = v->len;
832 return 0;
833 }
834
835 meta_ops(v)->get(skb, info, v, dst, &err);
836 if (err < 0)
837 return err;
838
839 if (meta_type_ops(v)->apply_extras)
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000840 meta_type_ops(v)->apply_extras(v, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842 return 0;
843}
844
845static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
846 struct tcf_pkt_info *info)
847{
848 int r;
849 struct meta_match *meta = (struct meta_match *) m->data;
850 struct meta_obj l_value, r_value;
851
852 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
853 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
854 return 0;
855
856 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
857
858 switch (meta->lvalue.hdr.op) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000859 case TCF_EM_OPND_EQ:
860 return !r;
861 case TCF_EM_OPND_LT:
862 return r < 0;
863 case TCF_EM_OPND_GT:
864 return r > 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 }
866
867 return 0;
868}
869
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800870static void meta_delete(struct meta_match *meta)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800872 if (meta) {
Julia Lawallcfe2f142016-04-09 10:49:22 +0200873 const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800875 if (ops && ops->destroy) {
876 ops->destroy(&meta->lvalue);
877 ops->destroy(&meta->rvalue);
878 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 }
880
881 kfree(meta);
882}
883
Patrick McHardyadd93b62008-01-22 22:11:33 -0800884static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800886 if (nla) {
887 if (nla_len(nla) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 return -EINVAL;
889
Patrick McHardyadd93b62008-01-22 22:11:33 -0800890 return meta_type_ops(dst)->change(dst, nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
892
893 return 0;
894}
895
896static inline int meta_is_supported(struct meta_value *val)
897{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000898 return !meta_id(val) || meta_ops(val)->get;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899}
900
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800901static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
902 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
903};
904
John Fastabend82a470f2014-10-05 21:27:53 -0700905static int em_meta_change(struct net *net, void *data, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 struct tcf_ematch *m)
907{
Patrick McHardycee63722008-01-23 20:33:32 -0800908 int err;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800909 struct nlattr *tb[TCA_EM_META_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 struct tcf_meta_hdr *hdr;
911 struct meta_match *meta = NULL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900912
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800913 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800914 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 goto errout;
916
Patrick McHardycee63722008-01-23 20:33:32 -0800917 err = -EINVAL;
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800918 if (tb[TCA_EM_META_HDR] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 goto errout;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800920 hdr = nla_data(tb[TCA_EM_META_HDR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
923 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
924 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
925 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
926 goto errout;
927
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700928 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
stephen hemminger0c4e4022013-09-26 17:40:11 -0700929 if (meta == NULL) {
930 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 goto errout;
stephen hemminger0c4e4022013-09-26 17:40:11 -0700932 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
935 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
936
937 if (!meta_is_supported(&meta->lvalue) ||
938 !meta_is_supported(&meta->rvalue)) {
939 err = -EOPNOTSUPP;
940 goto errout;
941 }
942
Patrick McHardyadd93b62008-01-22 22:11:33 -0800943 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
944 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 goto errout;
946
947 m->datalen = sizeof(*meta);
948 m->data = (unsigned long) meta;
949
950 err = 0;
951errout:
952 if (err && meta)
953 meta_delete(meta);
954 return err;
955}
956
John Fastabend82a470f2014-10-05 21:27:53 -0700957static void em_meta_destroy(struct tcf_ematch *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958{
959 if (m)
960 meta_delete((struct meta_match *) m->data);
961}
962
963static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
964{
965 struct meta_match *meta = (struct meta_match *) em->data;
966 struct tcf_meta_hdr hdr;
Julia Lawallcfe2f142016-04-09 10:49:22 +0200967 const struct meta_type_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
969 memset(&hdr, 0, sizeof(hdr));
970 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
971 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
972
David S. Miller1b34ec42012-03-29 05:11:39 -0400973 if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
974 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976 ops = meta_type_ops(&meta->lvalue);
977 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
978 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800979 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
981 return 0;
982
Patrick McHardyadd93b62008-01-22 22:11:33 -0800983nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 return -1;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900985}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
987static struct tcf_ematch_ops em_meta_ops = {
988 .kind = TCF_EM_META,
989 .change = em_meta_change,
990 .match = em_meta_match,
991 .destroy = em_meta_destroy,
992 .dump = em_meta_dump,
993 .owner = THIS_MODULE,
994 .link = LIST_HEAD_INIT(em_meta_ops.link)
995};
996
997static int __init init_em_meta(void)
998{
999 return tcf_em_register(&em_meta_ops);
1000}
1001
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001002static void __exit exit_em_meta(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
1004 tcf_em_unregister(&em_meta_ops);
1005}
1006
1007MODULE_LICENSE("GPL");
1008
1009module_init(init_em_meta);
1010module_exit(exit_em_meta);
Patrick McHardydb3d99c2007-07-11 19:46:26 -07001011
1012MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);