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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[linux.git] / net / sched / em_meta.c
CommitLineData
1da177e4
LT		 1/*
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 <[email protected]>
10 *
11 * ==========================================================================
10297b99 12 *
1da177e4
LT		 13 * 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 |
261688d0 30 * def | id: DEV | | id: VALUE |
1da177e4
LT		 31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
261688d0 34 * ---> meta_ops[INT][DEV](...) |
48900629 35 * | |
1da177e4
LT		 36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
261688d0 40 * obj | id: DEV | | id: VALUE |
1da177e4
LT		 41 * | 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 *
25985edc 50 * Additionally, type dependent modifiers such as shift operators
1da177e4
LT		 51 * 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
3a4fa0a2 58 * only available if that subsystem is enabled in the kernel.
1da177e4
LT		 59 */
60
5a0e3ad6 61#include <linux/slab.h>
1da177e4
LT		 62#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>
3113e88c 69#include <linux/if_vlan.h>
1da177e4
LT		 70#include <linux/tc_ematch/tc_em_meta.h>
71#include <net/dst.h>
72#include <net/route.h>
73#include <net/pkt_cls.h>
48900629 74#include <net/sock.h>
1da177e4 75
cc7ec456 76struct meta_obj {
1da177e4
LT		 77 unsigned long value;
78 unsigned int len;
79};
80
cc7ec456 81struct meta_value {
1da177e4
LT		 82 struct tcf_meta_val hdr;
83 unsigned long val;
84 unsigned int len;
85};
86
cc7ec456 87struct meta_match {
1da177e4
LT		 88 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
3113e88c
SH		 171/**************************************************************************
172 * vlan tag
173 **************************************************************************/
174
175META_COLLECTOR(int_vlan_tag)
176{
1a31f204
SH		 177 unsigned short tag;
178
179 tag = vlan_tx_tag_get(skb);
180 if (!tag && __vlan_get_tag(skb, &tag))
3113e88c
SH		 181 *err = -1;
182 else
183 dst->value = tag;
184}
185
186
187
1da177e4
LT		 188/**************************************************************************
189 * 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
1da177e4
LT		 203META_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
c2e3143e
SH		 223META_COLLECTOR(int_rxhash)
224{
225 dst->value = skb_get_rxhash(skb);
226}
227
1da177e4
LT		 228/**************************************************************************
229 * Netfilter
230 **************************************************************************/
231
82e91ffe 232META_COLLECTOR(int_mark)
1da177e4 233{
82e91ffe 234 dst->value = skb->mark;
7686ee1a 235}
1da177e4
LT		 236
237/**************************************************************************
238 * Traffic Control
239 **************************************************************************/
240
241META_COLLECTOR(int_tcindex)
242{
243 dst->value = skb->tc_index;
244}
245
1da177e4
LT		 246/**************************************************************************
247 * Routing
248 **************************************************************************/
249
1da177e4
LT		 250META_COLLECTOR(int_rtclassid)
251{
adf30907 252 if (unlikely(skb_dst(skb) == NULL))
1da177e4
LT		 253 *err = -1;
254 else
c7066f70 255#ifdef CONFIG_IP_ROUTE_CLASSID
adf30907 256 dst->value = skb_dst(skb)->tclassid;
7686ee1a
PM		 257#else
258 dst->value = 0;
1da177e4 259#endif
7686ee1a 260}
1da177e4
LT		 261
262META_COLLECTOR(int_rtiif)
263{
511c3f92 264 if (unlikely(skb_rtable(skb) == NULL))
1da177e4
LT		 265 *err = -1;
266 else
5e2b61f7 267 dst->value = skb_rtable(skb)->rt_iif;
1da177e4
LT		 268}
269
48900629
TG		 270/**************************************************************************
271 * Socket Attributes
272 **************************************************************************/
273
274#define SKIP_NONLOCAL(skb) \
275 if (unlikely(skb->sk == NULL)) { \
276 *err = -1; \
277 return; \
278 }
279
280META_COLLECTOR(int_sk_family)
281{
282 SKIP_NONLOCAL(skb);
283 dst->value = skb->sk->sk_family;
284}
285
286META_COLLECTOR(int_sk_state)
287{
288 SKIP_NONLOCAL(skb);
289 dst->value = skb->sk->sk_state;
290}
291
292META_COLLECTOR(int_sk_reuse)
293{
294 SKIP_NONLOCAL(skb);
295 dst->value = skb->sk->sk_reuse;
296}
297
298META_COLLECTOR(int_sk_bound_if)
299{
300 SKIP_NONLOCAL(skb);
301 /* No error if bound_dev_if is 0, legal userspace check */
302 dst->value = skb->sk->sk_bound_dev_if;
303}
304
305META_COLLECTOR(var_sk_bound_if)
306{
307 SKIP_NONLOCAL(skb);
308
d0075634 309 if (skb->sk->sk_bound_dev_if == 0) {
48900629
TG		 310 dst->value = (unsigned long) "any";
311 dst->len = 3;
d0075634 312 } else {
48900629 313 struct net_device *dev;
10297b99 314
d0075634 315 rcu_read_lock();
2939e275
ED		 316 dev = dev_get_by_index_rcu(sock_net(skb->sk),
317 skb->sk->sk_bound_dev_if);
48900629 318 *err = var_dev(dev, dst);
d0075634
ED		 319 rcu_read_unlock();
320 }
48900629
TG		 321}
322
323META_COLLECTOR(int_sk_refcnt)
324{
325 SKIP_NONLOCAL(skb);
326 dst->value = atomic_read(&skb->sk->sk_refcnt);
327}
328
329META_COLLECTOR(int_sk_rcvbuf)
330{
331 SKIP_NONLOCAL(skb);
332 dst->value = skb->sk->sk_rcvbuf;
333}
334
335META_COLLECTOR(int_sk_shutdown)
336{
337 SKIP_NONLOCAL(skb);
338 dst->value = skb->sk->sk_shutdown;
339}
340
341META_COLLECTOR(int_sk_proto)
342{
343 SKIP_NONLOCAL(skb);
344 dst->value = skb->sk->sk_protocol;
345}
346
347META_COLLECTOR(int_sk_type)
348{
349 SKIP_NONLOCAL(skb);
350 dst->value = skb->sk->sk_type;
351}
352
353META_COLLECTOR(int_sk_rmem_alloc)
354{
355 SKIP_NONLOCAL(skb);
31e6d363 356 dst->value = sk_rmem_alloc_get(skb->sk);
48900629
TG		 357}
358
359META_COLLECTOR(int_sk_wmem_alloc)
360{
361 SKIP_NONLOCAL(skb);
31e6d363 362 dst->value = sk_wmem_alloc_get(skb->sk);
48900629
TG		 363}
364
365META_COLLECTOR(int_sk_omem_alloc)
366{
367 SKIP_NONLOCAL(skb);
368 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
369}
370
371META_COLLECTOR(int_sk_rcv_qlen)
372{
373 SKIP_NONLOCAL(skb);
374 dst->value = skb->sk->sk_receive_queue.qlen;
375}
376
377META_COLLECTOR(int_sk_snd_qlen)
378{
379 SKIP_NONLOCAL(skb);
380 dst->value = skb->sk->sk_write_queue.qlen;
381}
382
383META_COLLECTOR(int_sk_wmem_queued)
384{
385 SKIP_NONLOCAL(skb);
386 dst->value = skb->sk->sk_wmem_queued;
387}
388
389META_COLLECTOR(int_sk_fwd_alloc)
390{
391 SKIP_NONLOCAL(skb);
392 dst->value = skb->sk->sk_forward_alloc;
393}
394
395META_COLLECTOR(int_sk_sndbuf)
396{
397 SKIP_NONLOCAL(skb);
398 dst->value = skb->sk->sk_sndbuf;
399}
400
401META_COLLECTOR(int_sk_alloc)
402{
403 SKIP_NONLOCAL(skb);
e0c56310 404 dst->value = (__force int) skb->sk->sk_allocation;
48900629
TG		 405}
406
81c3d547 407META_COLLECTOR(int_sk_hash)
48900629
TG		 408{
409 SKIP_NONLOCAL(skb);
81c3d547 410 dst->value = skb->sk->sk_hash;
48900629
TG		 411}
412
413META_COLLECTOR(int_sk_lingertime)
414{
415 SKIP_NONLOCAL(skb);
416 dst->value = skb->sk->sk_lingertime / HZ;
417}
418
419META_COLLECTOR(int_sk_err_qlen)
420{
421 SKIP_NONLOCAL(skb);
422 dst->value = skb->sk->sk_error_queue.qlen;
423}
424
425META_COLLECTOR(int_sk_ack_bl)
426{
427 SKIP_NONLOCAL(skb);
428 dst->value = skb->sk->sk_ack_backlog;
429}
430
431META_COLLECTOR(int_sk_max_ack_bl)
432{
433 SKIP_NONLOCAL(skb);
434 dst->value = skb->sk->sk_max_ack_backlog;
435}
436
437META_COLLECTOR(int_sk_prio)
438{
439 SKIP_NONLOCAL(skb);
440 dst->value = skb->sk->sk_priority;
441}
442
443META_COLLECTOR(int_sk_rcvlowat)
444{
445 SKIP_NONLOCAL(skb);
446 dst->value = skb->sk->sk_rcvlowat;
447}
448
449META_COLLECTOR(int_sk_rcvtimeo)
450{
451 SKIP_NONLOCAL(skb);
452 dst->value = skb->sk->sk_rcvtimeo / HZ;
453}
454
455META_COLLECTOR(int_sk_sndtimeo)
456{
457 SKIP_NONLOCAL(skb);
458 dst->value = skb->sk->sk_sndtimeo / HZ;
459}
460
461META_COLLECTOR(int_sk_sendmsg_off)
462{
463 SKIP_NONLOCAL(skb);
464 dst->value = skb->sk->sk_sndmsg_off;
465}
466
467META_COLLECTOR(int_sk_write_pend)
468{
469 SKIP_NONLOCAL(skb);
470 dst->value = skb->sk->sk_write_pending;
471}
472
1da177e4
LT		 473/**************************************************************************
474 * Meta value collectors assignment table
475 **************************************************************************/
476
cc7ec456 477struct meta_ops {
1da177e4
LT		 478 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
479 struct meta_value *, struct meta_obj *, int *);
480};
481
48900629
TG		 482#define META_ID(name) TCF_META_ID_##name
483#define META_FUNC(name) { .get = meta_##name }
484
1da177e4
LT		 485/* Meta value operations table listing all meta value collectors and
486 * assigns them to a type and meta id. */
cc7ec456 487static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
1da177e4 488 [TCF_META_TYPE_VAR] = {
48900629 489 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 490 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 491 },
492 [TCF_META_TYPE_INT] = {
48900629
TG		 493 [META_ID(RANDOM)] = META_FUNC(int_random),
494 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
495 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
496 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
497 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 498 [META_ID(PRIORITY)] = META_FUNC(int_priority),
499 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 500 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
501 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
502 [META_ID(DATALEN)] = META_FUNC(int_datalen),
503 [META_ID(MACLEN)] = META_FUNC(int_maclen),
82e91ffe 504 [META_ID(NFMARK)] = META_FUNC(int_mark),
48900629 505 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 506 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 507 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
508 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
509 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
510 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
511 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
512 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
513 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
514 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
515 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
516 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
517 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
518 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
519 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
520 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
521 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
522 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
523 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
524 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
525 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
526 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
81c3d547 527 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 528 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
529 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
530 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
531 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
532 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
533 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
534 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
535 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
536 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
3113e88c 537 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
c2e3143e 538 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
1da177e4
LT		 539 }
540};
541
cc7ec456 542static inline struct meta_ops *meta_ops(struct meta_value *val)
1da177e4
LT		 543{
544 return &__meta_ops[meta_type(val)][meta_id(val)];
545}
546
547/**************************************************************************
548 * Type specific operations for TCF_META_TYPE_VAR
549 **************************************************************************/
550
551static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
552{
553 int r = a->len - b->len;
554
555 if (r == 0)
556 r = memcmp((void *) a->value, (void *) b->value, a->len);
557
558 return r;
559}
560
add93b61 561static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 562{
add93b61 563 int len = nla_len(nla);
1da177e4 564
add93b61 565 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
1da177e4
LT		 566 if (dst->val == 0UL)
567 return -ENOMEM;
1da177e4
LT		 568 dst->len = len;
569 return 0;
570}
571
572static void meta_var_destroy(struct meta_value *v)
573{
a51482bd 574 kfree((void *) v->val);
1da177e4
LT		 575}
576
577static void meta_var_apply_extras(struct meta_value *v,
578 struct meta_obj *dst)
579{
580 int shift = v->hdr.shift;
581
582 if (shift && shift < dst->len)
583 dst->len -= shift;
584}
585
586static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
587{
588 if (v->val && v->len)
add93b61 589 NLA_PUT(skb, tlv, v->len, (void *) v->val);
1da177e4
LT		 590 return 0;
591
add93b61 592nla_put_failure:
1da177e4
LT		 593 return -1;
594}
595
596/**************************************************************************
597 * Type specific operations for TCF_META_TYPE_INT
598 **************************************************************************/
599
600static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
601{
602 /* Let gcc optimize it, the unlikely is not really based on
603 * some numbers but jump free code for mismatches seems
604 * more logical. */
98e56405 605 if (unlikely(a->value == b->value))
1da177e4 606 return 0;
98e56405 607 else if (a->value < b->value)
1da177e4
LT		 608 return -1;
609 else
610 return 1;
611}
612
add93b61 613static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 614{
add93b61
PM		 615 if (nla_len(nla) >= sizeof(unsigned long)) {
616 dst->val = *(unsigned long *) nla_data(nla);
1da177e4 617 dst->len = sizeof(unsigned long);
add93b61 618 } else if (nla_len(nla) == sizeof(u32)) {
1587bac4 619 dst->val = nla_get_u32(nla);
1da177e4
LT		 620 dst->len = sizeof(u32);
621 } else
622 return -EINVAL;
623
624 return 0;
625}
626
627static void meta_int_apply_extras(struct meta_value *v,
628 struct meta_obj *dst)
629{
630 if (v->hdr.shift)
631 dst->value >>= v->hdr.shift;
632
633 if (v->val)
634 dst->value &= v->val;
635}
636
637static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
638{
639 if (v->len == sizeof(unsigned long))
add93b61 640 NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
cc7ec456 641 else if (v->len == sizeof(u32))
24beeab5 642 NLA_PUT_U32(skb, tlv, v->val);
1da177e4
LT		 643
644 return 0;
645
add93b61 646nla_put_failure:
1da177e4
LT		 647 return -1;
648}
649
650/**************************************************************************
651 * Type specific operations table
652 **************************************************************************/
653
cc7ec456 654struct meta_type_ops {
1da177e4
LT		 655 void (*destroy)(struct meta_value *);
656 int (*compare)(struct meta_obj *, struct meta_obj *);
add93b61 657 int (*change)(struct meta_value *, struct nlattr *);
1da177e4
LT		 658 void (*apply_extras)(struct meta_value *, struct meta_obj *);
659 int (*dump)(struct sk_buff *, struct meta_value *, int);
660};
661
cc7ec456 662static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
1da177e4
LT		 663 [TCF_META_TYPE_VAR] = {
664 .destroy = meta_var_destroy,
665 .compare = meta_var_compare,
666 .change = meta_var_change,
667 .apply_extras = meta_var_apply_extras,
668 .dump = meta_var_dump
669 },
670 [TCF_META_TYPE_INT] = {
671 .compare = meta_int_compare,
672 .change = meta_int_change,
673 .apply_extras = meta_int_apply_extras,
674 .dump = meta_int_dump
675 }
676};
677
cc7ec456 678static inline struct meta_type_ops *meta_type_ops(struct meta_value *v)
1da177e4
LT		 679{
680 return &__meta_type_ops[meta_type(v)];
681}
682
683/**************************************************************************
684 * Core
685 **************************************************************************/
686
ed7af3b3
SH		 687static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
688 struct meta_value *v, struct meta_obj *dst)
1da177e4
LT		 689{
690 int err = 0;
691
692 if (meta_id(v) == TCF_META_ID_VALUE) {
693 dst->value = v->val;
694 dst->len = v->len;
695 return 0;
696 }
697
698 meta_ops(v)->get(skb, info, v, dst, &err);
699 if (err < 0)
700 return err;
701
702 if (meta_type_ops(v)->apply_extras)
cc7ec456 703 meta_type_ops(v)->apply_extras(v, dst);
1da177e4
LT		 704
705 return 0;
706}
707
708static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
709 struct tcf_pkt_info *info)
710{
711 int r;
712 struct meta_match *meta = (struct meta_match *) m->data;
713 struct meta_obj l_value, r_value;
714
715 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
716 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
717 return 0;
718
719 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
720
721 switch (meta->lvalue.hdr.op) {
cc7ec456
ED		 722 case TCF_EM_OPND_EQ:
723 return !r;
724 case TCF_EM_OPND_LT:
725 return r < 0;
726 case TCF_EM_OPND_GT:
727 return r > 0;
1da177e4
LT		 728 }
729
730 return 0;
731}
732
ed7af3b3 733static void meta_delete(struct meta_match *meta)
1da177e4 734{
04f217ac
SH		 735 if (meta) {
736 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
1da177e4 737
04f217ac
SH		 738 if (ops && ops->destroy) {
739 ops->destroy(&meta->lvalue);
740 ops->destroy(&meta->rvalue);
741 }
1da177e4
LT		 742 }
743
744 kfree(meta);
745}
746
add93b61 747static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
1da177e4 748{
add93b61
PM		 749 if (nla) {
750 if (nla_len(nla) == 0)
1da177e4
LT		 751 return -EINVAL;
752
add93b61 753 return meta_type_ops(dst)->change(dst, nla);
1da177e4
LT		 754 }
755
756 return 0;
757}
758
759static inline int meta_is_supported(struct meta_value *val)
760{
cc7ec456 761 return !meta_id(val) || meta_ops(val)->get;
1da177e4
LT		 762}
763
7a9c1bd4
PM		 764static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
765 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
766};
767
1da177e4
LT		 768static int em_meta_change(struct tcf_proto *tp, void *data, int len,
769 struct tcf_ematch *m)
770{
cee63723 771 int err;
add93b61 772 struct nlattr *tb[TCA_EM_META_MAX + 1];
1da177e4
LT		 773 struct tcf_meta_hdr *hdr;
774 struct meta_match *meta = NULL;
10297b99 775
7a9c1bd4 776 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
cee63723 777 if (err < 0)
1da177e4
LT		 778 goto errout;
779
cee63723 780 err = -EINVAL;
7a9c1bd4 781 if (tb[TCA_EM_META_HDR] == NULL)
1da177e4 782 goto errout;
add93b61 783 hdr = nla_data(tb[TCA_EM_META_HDR]);
1da177e4
LT		 784
785 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
786 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
787 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
788 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
789 goto errout;
790
0da974f4 791 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 792 if (meta == NULL)
793 goto errout;
1da177e4
LT		 794
795 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
796 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
797
798 if (!meta_is_supported(&meta->lvalue) ||
799 !meta_is_supported(&meta->rvalue)) {
800 err = -EOPNOTSUPP;
801 goto errout;
802 }
803
add93b61
PM		 804 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
805 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
1da177e4
LT		 806 goto errout;
807
808 m->datalen = sizeof(*meta);
809 m->data = (unsigned long) meta;
810
811 err = 0;
812errout:
813 if (err && meta)
814 meta_delete(meta);
815 return err;
816}
817
818static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
819{
820 if (m)
821 meta_delete((struct meta_match *) m->data);
822}
823
824static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
825{
826 struct meta_match *meta = (struct meta_match *) em->data;
827 struct tcf_meta_hdr hdr;
828 struct meta_type_ops *ops;
829
830 memset(&hdr, 0, sizeof(hdr));
831 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
832 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
833
add93b61 834 NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
1da177e4
LT		 835
836 ops = meta_type_ops(&meta->lvalue);
837 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
838 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
add93b61 839 goto nla_put_failure;
1da177e4
LT		 840
841 return 0;
842
add93b61 843nla_put_failure:
1da177e4 844 return -1;
10297b99 845}
1da177e4
LT		 846
847static struct tcf_ematch_ops em_meta_ops = {
848 .kind = TCF_EM_META,
849 .change = em_meta_change,
850 .match = em_meta_match,
851 .destroy = em_meta_destroy,
852 .dump = em_meta_dump,
853 .owner = THIS_MODULE,
854 .link = LIST_HEAD_INIT(em_meta_ops.link)
855};
856
857static int __init init_em_meta(void)
858{
859 return tcf_em_register(&em_meta_ops);
860}
861
10297b99 862static void __exit exit_em_meta(void)
1da177e4
LT		 863{
864 tcf_em_unregister(&em_meta_ops);
865}
866
867MODULE_LICENSE("GPL");
868
869module_init(init_em_meta);
870module_exit(exit_em_meta);
db3d99c0
PM		 871
872MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
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