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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
179 tag = vlan_tx_tag_get(skb);
180 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 */
200 dst->value = skb->protocol;
201}
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{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800346 if (skip_nonlocal(skb)) {
347 *err = -1;
348 return;
349 }
Thomas Graf48900622005-06-08 15:10:48 -0700350 dst->value = skb->sk->sk_rcvbuf;
351}
352
353META_COLLECTOR(int_sk_shutdown)
354{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800355 if (skip_nonlocal(skb)) {
356 *err = -1;
357 return;
358 }
Thomas Graf48900622005-06-08 15:10:48 -0700359 dst->value = skb->sk->sk_shutdown;
360}
361
362META_COLLECTOR(int_sk_proto)
363{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800364 if (skip_nonlocal(skb)) {
365 *err = -1;
366 return;
367 }
Thomas Graf48900622005-06-08 15:10:48 -0700368 dst->value = skb->sk->sk_protocol;
369}
370
371META_COLLECTOR(int_sk_type)
372{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800373 if (skip_nonlocal(skb)) {
374 *err = -1;
375 return;
376 }
Thomas Graf48900622005-06-08 15:10:48 -0700377 dst->value = skb->sk->sk_type;
378}
379
380META_COLLECTOR(int_sk_rmem_alloc)
381{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800382 if (skip_nonlocal(skb)) {
383 *err = -1;
384 return;
385 }
Eric Dumazet31e6d362009-06-17 19:05:41 -0700386 dst->value = sk_rmem_alloc_get(skb->sk);
Thomas Graf48900622005-06-08 15:10:48 -0700387}
388
389META_COLLECTOR(int_sk_wmem_alloc)
390{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800391 if (skip_nonlocal(skb)) {
392 *err = -1;
393 return;
394 }
Eric Dumazet31e6d362009-06-17 19:05:41 -0700395 dst->value = sk_wmem_alloc_get(skb->sk);
Thomas Graf48900622005-06-08 15:10:48 -0700396}
397
398META_COLLECTOR(int_sk_omem_alloc)
399{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800400 if (skip_nonlocal(skb)) {
401 *err = -1;
402 return;
403 }
Thomas Graf48900622005-06-08 15:10:48 -0700404 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
405}
406
407META_COLLECTOR(int_sk_rcv_qlen)
408{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800409 if (skip_nonlocal(skb)) {
410 *err = -1;
411 return;
412 }
Thomas Graf48900622005-06-08 15:10:48 -0700413 dst->value = skb->sk->sk_receive_queue.qlen;
414}
415
416META_COLLECTOR(int_sk_snd_qlen)
417{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800418 if (skip_nonlocal(skb)) {
419 *err = -1;
420 return;
421 }
Thomas Graf48900622005-06-08 15:10:48 -0700422 dst->value = skb->sk->sk_write_queue.qlen;
423}
424
425META_COLLECTOR(int_sk_wmem_queued)
426{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800427 if (skip_nonlocal(skb)) {
428 *err = -1;
429 return;
430 }
Thomas Graf48900622005-06-08 15:10:48 -0700431 dst->value = skb->sk->sk_wmem_queued;
432}
433
434META_COLLECTOR(int_sk_fwd_alloc)
435{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800436 if (skip_nonlocal(skb)) {
437 *err = -1;
438 return;
439 }
Thomas Graf48900622005-06-08 15:10:48 -0700440 dst->value = skb->sk->sk_forward_alloc;
441}
442
443META_COLLECTOR(int_sk_sndbuf)
444{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800445 if (skip_nonlocal(skb)) {
446 *err = -1;
447 return;
448 }
Thomas Graf48900622005-06-08 15:10:48 -0700449 dst->value = skb->sk->sk_sndbuf;
450}
451
452META_COLLECTOR(int_sk_alloc)
453{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800454 if (skip_nonlocal(skb)) {
455 *err = -1;
456 return;
457 }
stephen hemmingere0c56312011-02-23 09:06:52 +0000458 dst->value = (__force int) skb->sk->sk_allocation;
Thomas Graf48900622005-06-08 15:10:48 -0700459}
460
Eric Dumazet81c3d542005-10-03 14:13:38 -0700461META_COLLECTOR(int_sk_hash)
Thomas Graf48900622005-06-08 15:10:48 -0700462{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800463 if (skip_nonlocal(skb)) {
464 *err = -1;
465 return;
466 }
Eric Dumazet81c3d542005-10-03 14:13:38 -0700467 dst->value = skb->sk->sk_hash;
Thomas Graf48900622005-06-08 15:10:48 -0700468}
469
470META_COLLECTOR(int_sk_lingertime)
471{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800472 if (skip_nonlocal(skb)) {
473 *err = -1;
474 return;
475 }
Thomas Graf48900622005-06-08 15:10:48 -0700476 dst->value = skb->sk->sk_lingertime / HZ;
477}
478
479META_COLLECTOR(int_sk_err_qlen)
480{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800481 if (skip_nonlocal(skb)) {
482 *err = -1;
483 return;
484 }
Thomas Graf48900622005-06-08 15:10:48 -0700485 dst->value = skb->sk->sk_error_queue.qlen;
486}
487
488META_COLLECTOR(int_sk_ack_bl)
489{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800490 if (skip_nonlocal(skb)) {
491 *err = -1;
492 return;
493 }
Thomas Graf48900622005-06-08 15:10:48 -0700494 dst->value = skb->sk->sk_ack_backlog;
495}
496
497META_COLLECTOR(int_sk_max_ack_bl)
498{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800499 if (skip_nonlocal(skb)) {
500 *err = -1;
501 return;
502 }
Thomas Graf48900622005-06-08 15:10:48 -0700503 dst->value = skb->sk->sk_max_ack_backlog;
504}
505
506META_COLLECTOR(int_sk_prio)
507{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800508 if (skip_nonlocal(skb)) {
509 *err = -1;
510 return;
511 }
Thomas Graf48900622005-06-08 15:10:48 -0700512 dst->value = skb->sk->sk_priority;
513}
514
515META_COLLECTOR(int_sk_rcvlowat)
516{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800517 if (skip_nonlocal(skb)) {
518 *err = -1;
519 return;
520 }
Thomas Graf48900622005-06-08 15:10:48 -0700521 dst->value = skb->sk->sk_rcvlowat;
522}
523
524META_COLLECTOR(int_sk_rcvtimeo)
525{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800526 if (skip_nonlocal(skb)) {
527 *err = -1;
528 return;
529 }
Thomas Graf48900622005-06-08 15:10:48 -0700530 dst->value = skb->sk->sk_rcvtimeo / HZ;
531}
532
533META_COLLECTOR(int_sk_sndtimeo)
534{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800535 if (skip_nonlocal(skb)) {
536 *err = -1;
537 return;
538 }
Thomas Graf48900622005-06-08 15:10:48 -0700539 dst->value = skb->sk->sk_sndtimeo / HZ;
540}
541
542META_COLLECTOR(int_sk_sendmsg_off)
543{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800544 if (skip_nonlocal(skb)) {
545 *err = -1;
546 return;
547 }
Eric Dumazet5640f762012-09-23 23:04:42 +0000548 dst->value = skb->sk->sk_frag.offset;
Thomas Graf48900622005-06-08 15:10:48 -0700549}
550
551META_COLLECTOR(int_sk_write_pend)
552{
Yang Yingliang4f8f61e2013-12-11 15:17:11 +0800553 if (skip_nonlocal(skb)) {
554 *err = -1;
555 return;
556 }
Thomas Graf48900622005-06-08 15:10:48 -0700557 dst->value = skb->sk->sk_write_pending;
558}
559
560/**************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 * Meta value collectors assignment table
562 **************************************************************************/
563
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000564struct meta_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
566 struct meta_value *, struct meta_obj *, int *);
567};
568
Thomas Graf48900622005-06-08 15:10:48 -0700569#define META_ID(name) TCF_META_ID_##name
570#define META_FUNC(name) { .get = meta_##name }
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572/* Meta value operations table listing all meta value collectors and
573 * assigns them to a type and meta id. */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000574static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 [TCF_META_TYPE_VAR] = {
Thomas Graf48900622005-06-08 15:10:48 -0700576 [META_ID(DEV)] = META_FUNC(var_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700577 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 },
579 [TCF_META_TYPE_INT] = {
Thomas Graf48900622005-06-08 15:10:48 -0700580 [META_ID(RANDOM)] = META_FUNC(int_random),
581 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
582 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
583 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
584 [META_ID(DEV)] = META_FUNC(int_dev),
Thomas Graf48900622005-06-08 15:10:48 -0700585 [META_ID(PRIORITY)] = META_FUNC(int_priority),
586 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
Thomas Graf48900622005-06-08 15:10:48 -0700587 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
588 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
589 [META_ID(DATALEN)] = META_FUNC(int_datalen),
590 [META_ID(MACLEN)] = META_FUNC(int_maclen),
Thomas Graf82e91ff2006-11-09 15:19:14 -0800591 [META_ID(NFMARK)] = META_FUNC(int_mark),
Thomas Graf48900622005-06-08 15:10:48 -0700592 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
Thomas Graf48900622005-06-08 15:10:48 -0700593 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
Thomas Graf48900622005-06-08 15:10:48 -0700594 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
595 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
596 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
597 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
598 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
599 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
600 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
601 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
602 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
603 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
604 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
605 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
606 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
607 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
608 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
609 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
610 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
611 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
612 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
613 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
Eric Dumazet81c3d542005-10-03 14:13:38 -0700614 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
Thomas Graf48900622005-06-08 15:10:48 -0700615 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
616 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
617 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
618 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
619 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
620 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
621 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
622 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
623 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
Stephen Hemminger3113e882008-02-05 03:20:13 -0800624 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
Stephen Hemmingerc2e31432010-08-24 14:48:10 -0700625 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
627};
628
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000629static inline struct meta_ops *meta_ops(struct meta_value *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
631 return &__meta_ops[meta_type(val)][meta_id(val)];
632}
633
634/**************************************************************************
635 * Type specific operations for TCF_META_TYPE_VAR
636 **************************************************************************/
637
638static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
639{
640 int r = a->len - b->len;
641
642 if (r == 0)
643 r = memcmp((void *) a->value, (void *) b->value, a->len);
644
645 return r;
646}
647
Patrick McHardyadd93b62008-01-22 22:11:33 -0800648static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800650 int len = nla_len(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Patrick McHardyadd93b62008-01-22 22:11:33 -0800652 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 if (dst->val == 0UL)
654 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 dst->len = len;
656 return 0;
657}
658
659static void meta_var_destroy(struct meta_value *v)
660{
Jesper Juhla51482b2005-11-08 09:41:34 -0800661 kfree((void *) v->val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
664static void meta_var_apply_extras(struct meta_value *v,
665 struct meta_obj *dst)
666{
667 int shift = v->hdr.shift;
668
669 if (shift && shift < dst->len)
670 dst->len -= shift;
671}
672
673static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
674{
David S. Miller1b34ec42012-03-29 05:11:39 -0400675 if (v->val && v->len &&
676 nla_put(skb, tlv, v->len, (void *) v->val))
677 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return 0;
679
Patrick McHardyadd93b62008-01-22 22:11:33 -0800680nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 return -1;
682}
683
684/**************************************************************************
685 * Type specific operations for TCF_META_TYPE_INT
686 **************************************************************************/
687
688static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
689{
690 /* Let gcc optimize it, the unlikely is not really based on
691 * some numbers but jump free code for mismatches seems
692 * more logical. */
Thomas Graf98e56402005-06-08 15:11:19 -0700693 if (unlikely(a->value == b->value))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 return 0;
Thomas Graf98e56402005-06-08 15:11:19 -0700695 else if (a->value < b->value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 return -1;
697 else
698 return 1;
699}
700
Patrick McHardyadd93b62008-01-22 22:11:33 -0800701static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800703 if (nla_len(nla) >= sizeof(unsigned long)) {
704 dst->val = *(unsigned long *) nla_data(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 dst->len = sizeof(unsigned long);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800706 } else if (nla_len(nla) == sizeof(u32)) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800707 dst->val = nla_get_u32(nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 dst->len = sizeof(u32);
709 } else
710 return -EINVAL;
711
712 return 0;
713}
714
715static void meta_int_apply_extras(struct meta_value *v,
716 struct meta_obj *dst)
717{
718 if (v->hdr.shift)
719 dst->value >>= v->hdr.shift;
720
721 if (v->val)
722 dst->value &= v->val;
723}
724
725static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
726{
David S. Miller1b34ec42012-03-29 05:11:39 -0400727 if (v->len == sizeof(unsigned long)) {
728 if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
729 goto nla_put_failure;
730 } else if (v->len == sizeof(u32)) {
731 if (nla_put_u32(skb, tlv, v->val))
732 goto nla_put_failure;
733 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 return 0;
736
Patrick McHardyadd93b62008-01-22 22:11:33 -0800737nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 return -1;
739}
740
741/**************************************************************************
742 * Type specific operations table
743 **************************************************************************/
744
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000745struct meta_type_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 void (*destroy)(struct meta_value *);
747 int (*compare)(struct meta_obj *, struct meta_obj *);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800748 int (*change)(struct meta_value *, struct nlattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 void (*apply_extras)(struct meta_value *, struct meta_obj *);
750 int (*dump)(struct sk_buff *, struct meta_value *, int);
751};
752
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000753static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 [TCF_META_TYPE_VAR] = {
755 .destroy = meta_var_destroy,
756 .compare = meta_var_compare,
757 .change = meta_var_change,
758 .apply_extras = meta_var_apply_extras,
759 .dump = meta_var_dump
760 },
761 [TCF_META_TYPE_INT] = {
762 .compare = meta_int_compare,
763 .change = meta_int_change,
764 .apply_extras = meta_int_apply_extras,
765 .dump = meta_int_dump
766 }
767};
768
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000769static inline struct meta_type_ops *meta_type_ops(struct meta_value *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
771 return &__meta_type_ops[meta_type(v)];
772}
773
774/**************************************************************************
775 * Core
776 **************************************************************************/
777
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800778static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
779 struct meta_value *v, struct meta_obj *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
781 int err = 0;
782
783 if (meta_id(v) == TCF_META_ID_VALUE) {
784 dst->value = v->val;
785 dst->len = v->len;
786 return 0;
787 }
788
789 meta_ops(v)->get(skb, info, v, dst, &err);
790 if (err < 0)
791 return err;
792
793 if (meta_type_ops(v)->apply_extras)
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000794 meta_type_ops(v)->apply_extras(v, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 return 0;
797}
798
799static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
800 struct tcf_pkt_info *info)
801{
802 int r;
803 struct meta_match *meta = (struct meta_match *) m->data;
804 struct meta_obj l_value, r_value;
805
806 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
807 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
808 return 0;
809
810 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
811
812 switch (meta->lvalue.hdr.op) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000813 case TCF_EM_OPND_EQ:
814 return !r;
815 case TCF_EM_OPND_LT:
816 return r < 0;
817 case TCF_EM_OPND_GT:
818 return r > 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 }
820
821 return 0;
822}
823
Stephen Hemmingered7af3b2008-02-09 23:26:17 -0800824static void meta_delete(struct meta_match *meta)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825{
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800826 if (meta) {
827 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Stephen Hemminger04f217a2008-02-07 18:13:00 -0800829 if (ops && ops->destroy) {
830 ops->destroy(&meta->lvalue);
831 ops->destroy(&meta->rvalue);
832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 }
834
835 kfree(meta);
836}
837
Patrick McHardyadd93b62008-01-22 22:11:33 -0800838static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800840 if (nla) {
841 if (nla_len(nla) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 return -EINVAL;
843
Patrick McHardyadd93b62008-01-22 22:11:33 -0800844 return meta_type_ops(dst)->change(dst, nla);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 }
846
847 return 0;
848}
849
850static inline int meta_is_supported(struct meta_value *val)
851{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000852 return !meta_id(val) || meta_ops(val)->get;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853}
854
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800855static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
856 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
857};
858
John Fastabend82a470f2014-10-05 21:27:53 -0700859static int em_meta_change(struct net *net, void *data, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 struct tcf_ematch *m)
861{
Patrick McHardycee63722008-01-23 20:33:32 -0800862 int err;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800863 struct nlattr *tb[TCA_EM_META_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 struct tcf_meta_hdr *hdr;
865 struct meta_match *meta = NULL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900866
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800867 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800868 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 goto errout;
870
Patrick McHardycee63722008-01-23 20:33:32 -0800871 err = -EINVAL;
Patrick McHardy7a9c1bd2008-01-23 20:36:45 -0800872 if (tb[TCA_EM_META_HDR] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 goto errout;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800874 hdr = nla_data(tb[TCA_EM_META_HDR]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
876 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
877 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
878 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
879 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
880 goto errout;
881
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700882 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
stephen hemminger0c4e4022013-09-26 17:40:11 -0700883 if (meta == NULL) {
884 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 goto errout;
stephen hemminger0c4e4022013-09-26 17:40:11 -0700886 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
888 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
889 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
890
891 if (!meta_is_supported(&meta->lvalue) ||
892 !meta_is_supported(&meta->rvalue)) {
893 err = -EOPNOTSUPP;
894 goto errout;
895 }
896
Patrick McHardyadd93b62008-01-22 22:11:33 -0800897 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
898 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 goto errout;
900
901 m->datalen = sizeof(*meta);
902 m->data = (unsigned long) meta;
903
904 err = 0;
905errout:
906 if (err && meta)
907 meta_delete(meta);
908 return err;
909}
910
John Fastabend82a470f2014-10-05 21:27:53 -0700911static void em_meta_destroy(struct tcf_ematch *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912{
913 if (m)
914 meta_delete((struct meta_match *) m->data);
915}
916
917static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
918{
919 struct meta_match *meta = (struct meta_match *) em->data;
920 struct tcf_meta_hdr hdr;
921 struct meta_type_ops *ops;
922
923 memset(&hdr, 0, sizeof(hdr));
924 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
925 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
926
David S. Miller1b34ec42012-03-29 05:11:39 -0400927 if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
928 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
930 ops = meta_type_ops(&meta->lvalue);
931 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
932 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800933 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 return 0;
936
Patrick McHardyadd93b62008-01-22 22:11:33 -0800937nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 return -1;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900939}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941static struct tcf_ematch_ops em_meta_ops = {
942 .kind = TCF_EM_META,
943 .change = em_meta_change,
944 .match = em_meta_match,
945 .destroy = em_meta_destroy,
946 .dump = em_meta_dump,
947 .owner = THIS_MODULE,
948 .link = LIST_HEAD_INIT(em_meta_ops.link)
949};
950
951static int __init init_em_meta(void)
952{
953 return tcf_em_register(&em_meta_ops);
954}
955
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900956static void __exit exit_em_meta(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957{
958 tcf_em_unregister(&em_meta_ops);
959}
960
961MODULE_LICENSE("GPL");
962
963module_init(init_em_meta);
964module_exit(exit_em_meta);
Patrick McHardydb3d99c2007-07-11 19:46:26 -0700965
966MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);