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Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * net/sched/em_meta.c Metadata ematch
4 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Authors: Thomas Graf <tgraf@suug.ch>
6 *
7 * ==========================================================================
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * The metadata ematch compares two meta objects where each object
10 * represents either a meta value stored in the kernel or a static
11 * value provided by userspace. The objects are not provided by
12 * userspace itself but rather a definition providing the information
13 * to build them. Every object is of a certain type which must be
14 * equal to the object it is being compared to.
15 *
16 * The definition of a objects conists of the type (meta type), a
17 * identifier (meta id) and additional type specific information.
18 * The meta id is either TCF_META_TYPE_VALUE for values provided by
19 * userspace or a index to the meta operations table consisting of
20 * function pointers to type specific meta data collectors returning
21 * the value of the requested meta value.
22 *
23 * lvalue rvalue
24 * +-----------+ +-----------+
25 * | type: INT | | type: INT |
David S. Miller261688d2005-07-22 14:43:52 -070026 * def | id: DEV | | id: VALUE |
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 * | data: | | data: 3 |
28 * +-----------+ +-----------+
29 * | |
David S. Miller261688d2005-07-22 14:43:52 -070030 * ---> meta_ops[INT][DEV](...) |
Thomas Graf48900622005-06-08 15:10:48 -070031 * | |
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * ----------- |
33 * V V
34 * +-----------+ +-----------+
35 * | type: INT | | type: INT |
David S. Miller261688d2005-07-22 14:43:52 -070036 * obj | id: DEV | | id: VALUE |
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * | data: 2 |<--data got filled out | data: 3 |
38 * +-----------+ +-----------+
39 * | |
40 * --------------> 2 equals 3 <--------------
41 *
42 * This is a simplified schema, the complexity varies depending
43 * on the meta type. Obviously, the length of the data must also
44 * be provided for non-numeric types.
45 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -030046 * Additionally, type dependent modifiers such as shift operators
Taichi Nishimura4170f0e2023-03-23 14:27:13 +090047 * or mask may be applied to extend the functionality. As of now,
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 * the variable length type supports shifting the byte string to
49 * the right, eating up any number of octets and thus supporting
50 * wildcard interface name comparisons such as "ppp%" matching
51 * ppp0..9.
52 *
53 * NOTE: Certain meta values depend on other subsystems and are
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +020054 * only available if that subsystem is enabled in the kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 */
56
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090057#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/module.h>
59#include <linux/types.h>
60#include <linux/kernel.h>
61#include <linux/sched.h>
Ingo Molnar4f177222017-02-08 08:45:17 +010062#include <linux/sched/loadavg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <linux/string.h>
64#include <linux/skbuff.h>
65#include <linux/random.h>
Stephen Hemminger3113e882008-02-05 03:20:13 -080066#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/tc_ematch/tc_em_meta.h>
68#include <net/dst.h>
69#include <net/route.h>
70#include <net/pkt_cls.h>
Thomas Graf48900622005-06-08 15:10:48 -070071#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Eric Dumazetcc7ec452011-01-19 19:26:56 +000073struct meta_obj {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 unsigned long value;
75 unsigned int len;
76};
77
Eric Dumazetcc7ec452011-01-19 19:26:56 +000078struct meta_value {
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 struct tcf_meta_val hdr;
80 unsigned long val;
81 unsigned int len;
82};
83
Eric Dumazetcc7ec452011-01-19 19:26:56 +000084struct meta_match {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 struct meta_value lvalue;
86 struct meta_value rvalue;
87};
88
89static inline int meta_id(struct meta_value *v)
90{
91 return TCF_META_ID(v->hdr.kind);
92}
93
94static inline int meta_type(struct meta_value *v)
95{
96 return TCF_META_TYPE(v->hdr.kind);
97}
98
99#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
100 struct tcf_pkt_info *info, struct meta_value *v, \
101 struct meta_obj *dst, int *err)
102
103/**************************************************************************
104 * System status & misc
105 **************************************************************************/
106
107META_COLLECTOR(int_random)
108{
109 get_random_bytes(&dst->value, sizeof(dst->value));
110}
111
112static inline unsigned long fixed_loadavg(int load)
113{
114 int rnd_load = load + (FIXED_1/200);
115 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
116
117 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
118}
119
120META_COLLECTOR(int_loadavg_0)
121{
122 dst->value = fixed_loadavg(avenrun[0]);
123}
124
125META_COLLECTOR(int_loadavg_1)
126{
127 dst->value = fixed_loadavg(avenrun[1]);
128}
129
130META_COLLECTOR(int_loadavg_2)
131{
132 dst->value = fixed_loadavg(avenrun[2]);
133}
134
135/**************************************************************************
136 * Device names & indices
137 **************************************************************************/
138
139static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
140{
141 if (unlikely(dev == NULL))
142 return -1;
143
144 dst->value = dev->ifindex;
145 return 0;
146}
147
148static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
149{
150 if (unlikely(dev == NULL))
151 return -1;
152
153 dst->value = (unsigned long) dev->name;
154 dst->len = strlen(dev->name);
155 return 0;
156}
157
158META_COLLECTOR(int_dev)
159{
160 *err = int_dev(skb->dev, dst);
161}
162
163META_COLLECTOR(var_dev)
164{
165 *err = var_dev(skb->dev, dst);
166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168/**************************************************************************
Stephen Hemminger3113e882008-02-05 03:20:13 -0800169 * vlan tag
170 **************************************************************************/
171
172META_COLLECTOR(int_vlan_tag)
173{
Stephen Hemminger1a31f202009-04-13 18:12:57 -0700174 unsigned short tag;
175
Shmulik Ladkanid65f2fa2016-10-21 00:18:08 +0300176 if (skb_vlan_tag_present(skb))
177 dst->value = skb_vlan_tag_get(skb);
178 else if (!__vlan_get_tag(skb, &tag))
Stephen Hemminger3113e882008-02-05 03:20:13 -0800179 dst->value = tag;
Shmulik Ladkanid65f2fa2016-10-21 00:18:08 +0300180 else
181 *err = -1;
Stephen Hemminger3113e882008-02-05 03:20:13 -0800182}
183
184
185
186/**************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 * skb attributes
188 **************************************************************************/
189
190META_COLLECTOR(int_priority)
191{
192 dst->value = skb->priority;
193}
194
195META_COLLECTOR(int_protocol)
196{
197 /* Let userspace take care of the byte ordering */
Toke Høiland-Jørgensend7bf2eb2020-07-03 22:26:43 +0200198 dst->value = skb_protocol(skb, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201META_COLLECTOR(int_pkttype)
202{
203 dst->value = skb->pkt_type;
204}
205
206META_COLLECTOR(int_pktlen)
207{
208 dst->value = skb->len;
209}
210
211META_COLLECTOR(int_datalen)
212{
213 dst->value = skb->data_len;
214}
215
216META_COLLECTOR(int_maclen)
217{
218 dst->value = skb->mac_len;
219}
220
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700221META_COLLECTOR(int_rxhash)
222{
Tom Herbert3958afa1b2013-12-15 22:12:06 -0800223 dst->value = skb_get_hash(skb);
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700224}
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226/**************************************************************************
227 * Netfilter
228 **************************************************************************/
229
Thomas Graf82e91ff2006-11-09 15:19:14 -0800230META_COLLECTOR(int_mark)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Thomas Graf82e91ff2006-11-09 15:19:14 -0800232 dst->value = skb->mark;
Patrick McHardy7686ee12005-07-24 19:44:23 -0700233}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235/**************************************************************************
236 * Traffic Control
237 **************************************************************************/
238
239META_COLLECTOR(int_tcindex)
240{
241 dst->value = skb->tc_index;
242}
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244/**************************************************************************
245 * Routing
246 **************************************************************************/
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248META_COLLECTOR(int_rtclassid)
249{
Eric Dumazetadf30902009-06-02 05:19:30 +0000250 if (unlikely(skb_dst(skb) == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 *err = -1;
252 else
Patrick McHardyc7066f72011-01-14 13:36:42 +0100253#ifdef CONFIG_IP_ROUTE_CLASSID
Eric Dumazetadf30902009-06-02 05:19:30 +0000254 dst->value = skb_dst(skb)->tclassid;
Patrick McHardy7686ee12005-07-24 19:44:23 -0700255#else
256 dst->value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257#endif
Patrick McHardy7686ee12005-07-24 19:44:23 -0700258}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260META_COLLECTOR(int_rtiif)
261{
Eric Dumazet511c3f92009-06-02 05:14:27 +0000262 if (unlikely(skb_rtable(skb) == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 *err = -1;
264 else
David S. Miller92101b32012-07-23 16:29:00 -0700265 dst->value = inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
268/**************************************************************************
Thomas Graf48900622005-06-08 15:10:48 -0700269 * Socket Attributes
270 **************************************************************************/
271
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800272#define skip_nonlocal(skb) \
273 (unlikely(skb->sk == NULL))
Thomas Graf48900622005-06-08 15:10:48 -0700274
275META_COLLECTOR(int_sk_family)
276{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800277 if (skip_nonlocal(skb)) {
278 *err = -1;
279 return;
280 }
Thomas Graf48900622005-06-08 15:10:48 -0700281 dst->value = skb->sk->sk_family;
282}
283
284META_COLLECTOR(int_sk_state)
285{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800286 if (skip_nonlocal(skb)) {
287 *err = -1;
288 return;
289 }
Thomas Graf48900622005-06-08 15:10:48 -0700290 dst->value = skb->sk->sk_state;
291}
292
293META_COLLECTOR(int_sk_reuse)
294{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800295 if (skip_nonlocal(skb)) {
296 *err = -1;
297 return;
298 }
Thomas Graf48900622005-06-08 15:10:48 -0700299 dst->value = skb->sk->sk_reuse;
300}
301
302META_COLLECTOR(int_sk_bound_if)
303{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800304 if (skip_nonlocal(skb)) {
305 *err = -1;
306 return;
307 }
Thomas Graf48900622005-06-08 15:10:48 -0700308 /* No error if bound_dev_if is 0, legal userspace check */
309 dst->value = skb->sk->sk_bound_dev_if;
310}
311
312META_COLLECTOR(var_sk_bound_if)
313{
Eric Dumazet70f87de2022-05-13 11:55:47 -0700314 int bound_dev_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 Dumazet70f87de2022-05-13 11:55:47 -0700321 bound_dev_if = READ_ONCE(skb->sk->sk_bound_dev_if);
322 if (bound_dev_if == 0) {
Thomas Graf48900622005-06-08 15:10:48 -0700323 dst->value = (unsigned long) "any";
324 dst->len = 3;
Eric Dumazetd0075632009-11-04 05:23:31 -0800325 } else {
Thomas Graf48900622005-06-08 15:10:48 -0700326 struct net_device *dev;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900327
Eric Dumazetd0075632009-11-04 05:23:31 -0800328 rcu_read_lock();
Eric Dumazet2939e272009-11-18 23:24:41 -0800329 dev = dev_get_by_index_rcu(sock_net(skb->sk),
Eric Dumazet70f87de2022-05-13 11:55:47 -0700330 bound_dev_if);
Thomas Graf48900622005-06-08 15:10:48 -0700331 *err = var_dev(dev, dst);
Eric Dumazetd0075632009-11-04 05:23:31 -0800332 rcu_read_unlock();
333 }
Thomas Graf48900622005-06-08 15:10:48 -0700334}
335
336META_COLLECTOR(int_sk_refcnt)
337{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800338 if (skip_nonlocal(skb)) {
339 *err = -1;
340 return;
341 }
Reshetova, Elena41c6d652017-06-30 13:08:01 +0300342 dst->value = refcount_read(&skb->sk->sk_refcnt);
Thomas Graf48900622005-06-08 15:10:48 -0700343}
344
345META_COLLECTOR(int_sk_rcvbuf)
346{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800347 const struct sock *sk = skb_to_full_sk(skb);
348
349 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800350 *err = -1;
351 return;
352 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800353 dst->value = sk->sk_rcvbuf;
Thomas Graf48900622005-06-08 15:10:48 -0700354}
355
356META_COLLECTOR(int_sk_shutdown)
357{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800358 const struct sock *sk = skb_to_full_sk(skb);
359
360 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800361 *err = -1;
362 return;
363 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800364 dst->value = sk->sk_shutdown;
Thomas Graf48900622005-06-08 15:10:48 -0700365}
366
367META_COLLECTOR(int_sk_proto)
368{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800369 const struct sock *sk = skb_to_full_sk(skb);
370
371 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800372 *err = -1;
373 return;
374 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800375 dst->value = sk->sk_protocol;
Thomas Graf48900622005-06-08 15:10:48 -0700376}
377
378META_COLLECTOR(int_sk_type)
379{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800380 const struct sock *sk = skb_to_full_sk(skb);
381
382 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800383 *err = -1;
384 return;
385 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800386 dst->value = sk->sk_type;
Thomas Graf48900622005-06-08 15:10:48 -0700387}
388
389META_COLLECTOR(int_sk_rmem_alloc)
390{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800391 const struct sock *sk = skb_to_full_sk(skb);
392
393 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800394 *err = -1;
395 return;
396 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800397 dst->value = sk_rmem_alloc_get(sk);
Thomas Graf48900622005-06-08 15:10:48 -0700398}
399
400META_COLLECTOR(int_sk_wmem_alloc)
401{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800402 const struct sock *sk = skb_to_full_sk(skb);
403
404 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800405 *err = -1;
406 return;
407 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800408 dst->value = sk_wmem_alloc_get(sk);
Thomas Graf48900622005-06-08 15:10:48 -0700409}
410
411META_COLLECTOR(int_sk_omem_alloc)
412{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800413 const struct sock *sk = skb_to_full_sk(skb);
414
415 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800416 *err = -1;
417 return;
418 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800419 dst->value = atomic_read(&sk->sk_omem_alloc);
Thomas Graf48900622005-06-08 15:10:48 -0700420}
421
422META_COLLECTOR(int_sk_rcv_qlen)
423{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800424 const struct sock *sk = skb_to_full_sk(skb);
425
426 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800427 *err = -1;
428 return;
429 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800430 dst->value = sk->sk_receive_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700431}
432
433META_COLLECTOR(int_sk_snd_qlen)
434{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800435 const struct sock *sk = skb_to_full_sk(skb);
436
437 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800438 *err = -1;
439 return;
440 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800441 dst->value = sk->sk_write_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700442}
443
444META_COLLECTOR(int_sk_wmem_queued)
445{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800446 const struct sock *sk = skb_to_full_sk(skb);
447
448 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800449 *err = -1;
450 return;
451 }
Eric Dumazetab4e8462019-10-10 20:17:46 -0700452 dst->value = READ_ONCE(sk->sk_wmem_queued);
Thomas Graf48900622005-06-08 15:10:48 -0700453}
454
455META_COLLECTOR(int_sk_fwd_alloc)
456{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800457 const struct sock *sk = skb_to_full_sk(skb);
458
459 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800460 *err = -1;
461 return;
462 }
Paolo Abeni292e6072021-10-26 16:29:14 -0700463 dst->value = sk_forward_alloc_get(sk);
Thomas Graf48900622005-06-08 15:10:48 -0700464}
465
466META_COLLECTOR(int_sk_sndbuf)
467{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800468 const struct sock *sk = skb_to_full_sk(skb);
469
470 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800471 *err = -1;
472 return;
473 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800474 dst->value = sk->sk_sndbuf;
Thomas Graf48900622005-06-08 15:10:48 -0700475}
476
477META_COLLECTOR(int_sk_alloc)
478{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800479 const struct sock *sk = skb_to_full_sk(skb);
480
481 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800482 *err = -1;
483 return;
484 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800485 dst->value = (__force int) sk->sk_allocation;
Thomas Graf48900622005-06-08 15:10:48 -0700486}
487
Eric Dumazet81c3d542005-10-03 14:13:38 -0700488META_COLLECTOR(int_sk_hash)
Thomas Graf48900622005-06-08 15:10:48 -0700489{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800490 if (skip_nonlocal(skb)) {
491 *err = -1;
492 return;
493 }
Eric Dumazet81c3d542005-10-03 14:13:38 -0700494 dst->value = skb->sk->sk_hash;
Thomas Graf48900622005-06-08 15:10:48 -0700495}
496
497META_COLLECTOR(int_sk_lingertime)
498{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800499 const struct sock *sk = skb_to_full_sk(skb);
500
501 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800502 *err = -1;
503 return;
504 }
Eric Dumazetbc1fb822023-08-19 04:06:46 +0000505 dst->value = READ_ONCE(sk->sk_lingertime) / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700506}
507
508META_COLLECTOR(int_sk_err_qlen)
509{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800510 const struct sock *sk = skb_to_full_sk(skb);
511
512 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800513 *err = -1;
514 return;
515 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800516 dst->value = sk->sk_error_queue.qlen;
Thomas Graf48900622005-06-08 15:10:48 -0700517}
518
519META_COLLECTOR(int_sk_ack_bl)
520{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800521 const struct sock *sk = skb_to_full_sk(skb);
522
523 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800524 *err = -1;
525 return;
526 }
Eric Dumazet288efe82019-11-05 14:11:53 -0800527 dst->value = READ_ONCE(sk->sk_ack_backlog);
Thomas Graf48900622005-06-08 15:10:48 -0700528}
529
530META_COLLECTOR(int_sk_max_ack_bl)
531{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800532 const struct sock *sk = skb_to_full_sk(skb);
533
534 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800535 *err = -1;
536 return;
537 }
Eric Dumazet099ecf52019-11-05 14:11:54 -0800538 dst->value = READ_ONCE(sk->sk_max_ack_backlog);
Thomas Graf48900622005-06-08 15:10:48 -0700539}
540
541META_COLLECTOR(int_sk_prio)
542{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800543 const struct sock *sk = skb_to_full_sk(skb);
544
545 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800546 *err = -1;
547 return;
548 }
Eric Dumazet10bbf162023-09-21 20:28:11 +0000549 dst->value = READ_ONCE(sk->sk_priority);
Thomas Graf48900622005-06-08 15:10:48 -0700550}
551
552META_COLLECTOR(int_sk_rcvlowat)
553{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800554 const struct sock *sk = skb_to_full_sk(skb);
555
556 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800557 *err = -1;
558 return;
559 }
Eric Dumazeteac66402019-10-09 15:32:35 -0700560 dst->value = READ_ONCE(sk->sk_rcvlowat);
Thomas Graf48900622005-06-08 15:10:48 -0700561}
562
563META_COLLECTOR(int_sk_rcvtimeo)
564{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800565 const struct sock *sk = skb_to_full_sk(skb);
566
567 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800568 *err = -1;
569 return;
570 }
Eric Dumazet285975d2023-07-28 15:03:12 +0000571 dst->value = READ_ONCE(sk->sk_rcvtimeo) / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700572}
573
574META_COLLECTOR(int_sk_sndtimeo)
575{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800576 const struct sock *sk = skb_to_full_sk(skb);
577
578 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800579 *err = -1;
580 return;
581 }
Eric Dumazet285975d2023-07-28 15:03:12 +0000582 dst->value = READ_ONCE(sk->sk_sndtimeo) / HZ;
Thomas Graf48900622005-06-08 15:10:48 -0700583}
584
585META_COLLECTOR(int_sk_sendmsg_off)
586{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800587 const struct sock *sk = skb_to_full_sk(skb);
588
589 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800590 *err = -1;
591 return;
592 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800593 dst->value = sk->sk_frag.offset;
Thomas Graf48900622005-06-08 15:10:48 -0700594}
595
596META_COLLECTOR(int_sk_write_pend)
597{
Eric Dumazet02a56c82015-11-08 10:54:11 -0800598 const struct sock *sk = skb_to_full_sk(skb);
599
600 if (!sk) {
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800601 *err = -1;
602 return;
603 }
Eric Dumazet02a56c82015-11-08 10:54:11 -0800604 dst->value = sk->sk_write_pending;
Thomas Graf48900622005-06-08 15:10:48 -0700605}
606
607/**************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 * Meta value collectors assignment table
609 **************************************************************************/
610
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000611struct meta_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
613 struct meta_value *, struct meta_obj *, int *);
614};
615
Thomas Graf48900622005-06-08 15:10:48 -0700616#define META_ID(name) TCF_META_ID_##name
617#define META_FUNC(name) { .get = meta_##name }
618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619/* Meta value operations table listing all meta value collectors and
620 * assigns them to a type and meta id. */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000621static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 [TCF_META_TYPE_VAR] = {
Thomas Graf48900622005-06-08 15:10:48 -0700623 [META_ID(DEV)] = META_FUNC(var_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700624 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 },
626 [TCF_META_TYPE_INT] = {
Thomas Graf48900622005-06-08 15:10:48 -0700627 [META_ID(RANDOM)] = META_FUNC(int_random),
628 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
629 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
630 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
631 [META_ID(DEV)] = META_FUNC(int_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700632 [META_ID(PRIORITY)] = META_FUNC(int_priority),
633 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
Thomas Graf48900622005-06-08 15:10:48 -0700634 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
635 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
636 [META_ID(DATALEN)] = META_FUNC(int_datalen),
637 [META_ID(MACLEN)] = META_FUNC(int_maclen),
Thomas Graf82e91ff2006-11-09 15:19:14 -0800638 [META_ID(NFMARK)] = META_FUNC(int_mark),
Thomas Graf48900622005-06-08 15:10:48 -0700639 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
Thomas Graf48900622005-06-08 15:10:48 -0700640 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
Thomas Graf48900622005-06-08 15:10:48 -0700641 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
642 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
643 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
644 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
645 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
646 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
647 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
648 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
649 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
650 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
651 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
652 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
653 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
654 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
655 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
656 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
657 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
658 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
659 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
660 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
Eric Dumazet81c3d542005-10-03 14:13:38 -0700661 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
Thomas Graf48900622005-06-08 15:10:48 -0700662 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
663 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
664 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
665 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
666 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
667 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
668 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
669 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
670 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
Stephen Hemminger3113e882008-02-05 03:20:13 -0800671 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700672 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 }
674};
675
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000676static inline struct meta_ops *meta_ops(struct meta_value *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677{
678 return &__meta_ops[meta_type(val)][meta_id(val)];
679}
680
681/**************************************************************************
682 * Type specific operations for TCF_META_TYPE_VAR
683 **************************************************************************/
684
685static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
686{
687 int r = a->len - b->len;
688
689 if (r == 0)
690 r = memcmp((void *) a->value, (void *) b->value, a->len);
691
692 return r;
693}
694
Patrick McHardyadd93b62008-01-22 22:11:33 -0800695static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800697 int len = nla_len(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Patrick McHardyadd93b62008-01-22 22:11:33 -0800699 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (dst->val == 0UL)
701 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 dst->len = len;
703 return 0;
704}
705
706static void meta_var_destroy(struct meta_value *v)
707{
Jesper Juhla51482b2005-11-08 09:41:34 -0800708 kfree((void *) v->val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709}
710
711static void meta_var_apply_extras(struct meta_value *v,
712 struct meta_obj *dst)
713{
714 int shift = v->hdr.shift;
715
716 if (shift && shift < dst->len)
717 dst->len -= shift;
718}
719
720static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
721{
David S. Miller1b34ec42012-03-29 05:11:39 -0400722 if (v->val && v->len &&
723 nla_put(skb, tlv, v->len, (void *) v->val))
724 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 return 0;
726
Patrick McHardyadd93b62008-01-22 22:11:33 -0800727nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 return -1;
729}
730
731/**************************************************************************
732 * Type specific operations for TCF_META_TYPE_INT
733 **************************************************************************/
734
735static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
736{
737 /* Let gcc optimize it, the unlikely is not really based on
738 * some numbers but jump free code for mismatches seems
739 * more logical. */
Thomas Graf98e56402005-06-08 15:11:19 -0700740 if (unlikely(a->value == b->value))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 return 0;
Thomas Graf98e56402005-06-08 15:11:19 -0700742 else if (a->value < b->value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return -1;
744 else
745 return 1;
746}
747
Patrick McHardyadd93b62008-01-22 22:11:33 -0800748static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800750 if (nla_len(nla) >= sizeof(unsigned long)) {
751 dst->val = *(unsigned long *) nla_data(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 dst->len = sizeof(unsigned long);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800753 } else if (nla_len(nla) == sizeof(u32)) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800754 dst->val = nla_get_u32(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 dst->len = sizeof(u32);
756 } else
757 return -EINVAL;
758
759 return 0;
760}
761
762static void meta_int_apply_extras(struct meta_value *v,
763 struct meta_obj *dst)
764{
765 if (v->hdr.shift)
766 dst->value >>= v->hdr.shift;
767
768 if (v->val)
769 dst->value &= v->val;
770}
771
772static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
773{
David S. Miller1b34ec42012-03-29 05:11:39 -0400774 if (v->len == sizeof(unsigned long)) {
775 if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
776 goto nla_put_failure;
777 } else if (v->len == sizeof(u32)) {
778 if (nla_put_u32(skb, tlv, v->val))
779 goto nla_put_failure;
780 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782 return 0;
783
Patrick McHardyadd93b62008-01-22 22:11:33 -0800784nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 return -1;
786}
787
788/**************************************************************************
789 * Type specific operations table
790 **************************************************************************/
791
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000792struct meta_type_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 void (*destroy)(struct meta_value *);
794 int (*compare)(struct meta_obj *, struct meta_obj *);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800795 int (*change)(struct meta_value *, struct nlattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 void (*apply_extras)(struct meta_value *, struct meta_obj *);
797 int (*dump)(struct sk_buff *, struct meta_value *, int);
798};
799
Julia Lawallcfe2f142016-04-09 10:49:22 +0200800static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 [TCF_META_TYPE_VAR] = {
802 .destroy = meta_var_destroy,
803 .compare = meta_var_compare,
804 .change = meta_var_change,
805 .apply_extras = meta_var_apply_extras,
806 .dump = meta_var_dump
807 },
808 [TCF_META_TYPE_INT] = {
809 .compare = meta_int_compare,
810 .change = meta_int_change,
811 .apply_extras = meta_int_apply_extras,
812 .dump = meta_int_dump
813 }
814};
815
Julia Lawallcfe2f142016-04-09 10:49:22 +0200816static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817{
818 return &__meta_type_ops[meta_type(v)];
819}
820
821/**************************************************************************
822 * Core
823 **************************************************************************/
824
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800825static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
826 struct meta_value *v, struct meta_obj *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
828 int err = 0;
829
830 if (meta_id(v) == TCF_META_ID_VALUE) {
831 dst->value = v->val;
832 dst->len = v->len;
833 return 0;
834 }
835
836 meta_ops(v)->get(skb, info, v, dst, &err);
837 if (err < 0)
838 return err;
839
840 if (meta_type_ops(v)->apply_extras)
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000841 meta_type_ops(v)->apply_extras(v, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 return 0;
844}
845
846static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
847 struct tcf_pkt_info *info)
848{
849 int r;
850 struct meta_match *meta = (struct meta_match *) m->data;
851 struct meta_obj l_value, r_value;
852
853 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
854 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
855 return 0;
856
857 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
858
859 switch (meta->lvalue.hdr.op) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000860 case TCF_EM_OPND_EQ:
861 return !r;
862 case TCF_EM_OPND_LT:
863 return r < 0;
864 case TCF_EM_OPND_GT:
865 return r > 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 }
867
868 return 0;
869}
870
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800871static void meta_delete(struct meta_match *meta)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872{
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800873 if (meta) {
Julia Lawallcfe2f142016-04-09 10:49:22 +0200874 const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800876 if (ops && ops->destroy) {
877 ops->destroy(&meta->lvalue);
878 ops->destroy(&meta->rvalue);
879 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
881
882 kfree(meta);
883}
884
Patrick McHardyadd93b62008-01-22 22:11:33 -0800885static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800887 if (nla) {
888 if (nla_len(nla) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 return -EINVAL;
890
Patrick McHardyadd93b62008-01-22 22:11:33 -0800891 return meta_type_ops(dst)->change(dst, nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893
894 return 0;
895}
896
897static inline int meta_is_supported(struct meta_value *val)
898{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000899 return !meta_id(val) || meta_ops(val)->get;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900}
901
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800902static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
903 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
904};
905
John Fastabend82a470f2014-10-05 21:27:53 -0700906static int em_meta_change(struct net *net, void *data, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 struct tcf_ematch *m)
908{
Patrick McHardycee63722008-01-23 20:33:32 -0800909 int err;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800910 struct nlattr *tb[TCA_EM_META_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 struct tcf_meta_hdr *hdr;
912 struct meta_match *meta = NULL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900913
Johannes Berg8cb08172019-04-26 14:07:28 +0200914 err = nla_parse_deprecated(tb, TCA_EM_META_MAX, data, len,
915 meta_policy, NULL);
Patrick McHardycee63722008-01-23 20:33:32 -0800916 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 goto errout;
918
Patrick McHardycee63722008-01-23 20:33:32 -0800919 err = -EINVAL;
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800920 if (tb[TCA_EM_META_HDR] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 goto errout;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800922 hdr = nla_data(tb[TCA_EM_META_HDR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
925 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
926 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
927 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
928 goto errout;
929
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700930 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
stephen hemminger0c4e4022013-09-26 17:40:11 -0700931 if (meta == NULL) {
932 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 goto errout;
stephen hemminger0c4e4022013-09-26 17:40:11 -0700934 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
936 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
937 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
938
939 if (!meta_is_supported(&meta->lvalue) ||
940 !meta_is_supported(&meta->rvalue)) {
941 err = -EOPNOTSUPP;
942 goto errout;
943 }
944
Patrick McHardyadd93b62008-01-22 22:11:33 -0800945 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
946 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 goto errout;
948
949 m->datalen = sizeof(*meta);
950 m->data = (unsigned long) meta;
951
952 err = 0;
953errout:
954 if (err && meta)
955 meta_delete(meta);
956 return err;
957}
958
John Fastabend82a470f2014-10-05 21:27:53 -0700959static void em_meta_destroy(struct tcf_ematch *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960{
961 if (m)
962 meta_delete((struct meta_match *) m->data);
963}
964
965static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
966{
967 struct meta_match *meta = (struct meta_match *) em->data;
968 struct tcf_meta_hdr hdr;
Julia Lawallcfe2f142016-04-09 10:49:22 +0200969 const struct meta_type_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 memset(&hdr, 0, sizeof(hdr));
972 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
973 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
974
David S. Miller1b34ec42012-03-29 05:11:39 -0400975 if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
976 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
978 ops = meta_type_ops(&meta->lvalue);
979 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
980 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800981 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
983 return 0;
984
Patrick McHardyadd93b62008-01-22 22:11:33 -0800985nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 return -1;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900987}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989static struct tcf_ematch_ops em_meta_ops = {
990 .kind = TCF_EM_META,
991 .change = em_meta_change,
992 .match = em_meta_match,
993 .destroy = em_meta_destroy,
994 .dump = em_meta_dump,
995 .owner = THIS_MODULE,
996 .link = LIST_HEAD_INIT(em_meta_ops.link)
997};
998
999static int __init init_em_meta(void)
1000{
1001 return tcf_em_register(&em_meta_ops);
1002}
1003
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001004static void __exit exit_em_meta(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005{
1006 tcf_em_unregister(&em_meta_ops);
1007}
1008
1009MODULE_LICENSE("GPL");
1010
1011module_init(init_em_meta);
1012module_exit(exit_em_meta);
Patrick McHardydb3d99c2007-07-11 19:46:26 -07001013
1014MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);