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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 *
50 * Additionaly, type dependant modifiers such as shift operators
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
LT		 75
76struct meta_obj
77{
78 unsigned long value;
79 unsigned int len;
80};
81
82struct meta_value
83{
84 struct tcf_meta_val hdr;
85 unsigned long val;
86 unsigned int len;
87};
88
89struct meta_match
90{
91 struct meta_value lvalue;
92 struct meta_value rvalue;
93};
94
95static inline int meta_id(struct meta_value *v)
96{
97 return TCF_META_ID(v->hdr.kind);
98}
99
100static inline int meta_type(struct meta_value *v)
101{
102 return TCF_META_TYPE(v->hdr.kind);
103}
104
105#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
106 struct tcf_pkt_info *info, struct meta_value *v, \
107 struct meta_obj *dst, int *err)
108
109/**************************************************************************
110 * System status & misc
111 **************************************************************************/
112
113META_COLLECTOR(int_random)
114{
115 get_random_bytes(&dst->value, sizeof(dst->value));
116}
117
118static inline unsigned long fixed_loadavg(int load)
119{
120 int rnd_load = load + (FIXED_1/200);
121 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
122
123 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
124}
125
126META_COLLECTOR(int_loadavg_0)
127{
128 dst->value = fixed_loadavg(avenrun[0]);
129}
130
131META_COLLECTOR(int_loadavg_1)
132{
133 dst->value = fixed_loadavg(avenrun[1]);
134}
135
136META_COLLECTOR(int_loadavg_2)
137{
138 dst->value = fixed_loadavg(avenrun[2]);
139}
140
141/**************************************************************************
142 * Device names & indices
143 **************************************************************************/
144
145static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
146{
147 if (unlikely(dev == NULL))
148 return -1;
149
150 dst->value = dev->ifindex;
151 return 0;
152}
153
154static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
155{
156 if (unlikely(dev == NULL))
157 return -1;
158
159 dst->value = (unsigned long) dev->name;
160 dst->len = strlen(dev->name);
161 return 0;
162}
163
164META_COLLECTOR(int_dev)
165{
166 *err = int_dev(skb->dev, dst);
167}
168
169META_COLLECTOR(var_dev)
170{
171 *err = var_dev(skb->dev, dst);
172}
173
3113e88c
SH		 174/**************************************************************************
175 * vlan tag
176 **************************************************************************/
177
178META_COLLECTOR(int_vlan_tag)
179{
1a31f204
SH		 180 unsigned short tag;
181
182 tag = vlan_tx_tag_get(skb);
183 if (!tag && __vlan_get_tag(skb, &tag))
3113e88c
SH		 184 *err = -1;
185 else
186 dst->value = tag;
187}
188
189
190
1da177e4
LT		 191/**************************************************************************
192 * skb attributes
193 **************************************************************************/
194
195META_COLLECTOR(int_priority)
196{
197 dst->value = skb->priority;
198}
199
200META_COLLECTOR(int_protocol)
201{
202 /* Let userspace take care of the byte ordering */
203 dst->value = skb->protocol;
204}
205
1da177e4
LT		 206META_COLLECTOR(int_pkttype)
207{
208 dst->value = skb->pkt_type;
209}
210
211META_COLLECTOR(int_pktlen)
212{
213 dst->value = skb->len;
214}
215
216META_COLLECTOR(int_datalen)
217{
218 dst->value = skb->data_len;
219}
220
221META_COLLECTOR(int_maclen)
222{
223 dst->value = skb->mac_len;
224}
225
226/**************************************************************************
227 * Netfilter
228 **************************************************************************/
229
82e91ffe 230META_COLLECTOR(int_mark)
1da177e4 231{
82e91ffe 232 dst->value = skb->mark;
7686ee1a 233}
1da177e4
LT		 234
235/**************************************************************************
236 * Traffic Control
237 **************************************************************************/
238
239META_COLLECTOR(int_tcindex)
240{
241 dst->value = skb->tc_index;
242}
243
1da177e4
LT		 244/**************************************************************************
245 * Routing
246 **************************************************************************/
247
1da177e4
LT		 248META_COLLECTOR(int_rtclassid)
249{
adf30907 250 if (unlikely(skb_dst(skb) == NULL))
1da177e4
LT		 251 *err = -1;
252 else
7686ee1a 253#ifdef CONFIG_NET_CLS_ROUTE
adf30907 254 dst->value = skb_dst(skb)->tclassid;
7686ee1a
PM		 255#else
256 dst->value = 0;
1da177e4 257#endif
7686ee1a 258}
1da177e4
LT		 259
260META_COLLECTOR(int_rtiif)
261{
511c3f92 262 if (unlikely(skb_rtable(skb) == NULL))
1da177e4
LT		 263 *err = -1;
264 else
511c3f92 265 dst->value = skb_rtable(skb)->fl.iif;
1da177e4
LT		 266}
267
48900629
TG		 268/**************************************************************************
269 * Socket Attributes
270 **************************************************************************/
271
272#define SKIP_NONLOCAL(skb) \
273 if (unlikely(skb->sk == NULL)) { \
274 *err = -1; \
275 return; \
276 }
277
278META_COLLECTOR(int_sk_family)
279{
280 SKIP_NONLOCAL(skb);
281 dst->value = skb->sk->sk_family;
282}
283
284META_COLLECTOR(int_sk_state)
285{
286 SKIP_NONLOCAL(skb);
287 dst->value = skb->sk->sk_state;
288}
289
290META_COLLECTOR(int_sk_reuse)
291{
292 SKIP_NONLOCAL(skb);
293 dst->value = skb->sk->sk_reuse;
294}
295
296META_COLLECTOR(int_sk_bound_if)
297{
298 SKIP_NONLOCAL(skb);
299 /* No error if bound_dev_if is 0, legal userspace check */
300 dst->value = skb->sk->sk_bound_dev_if;
301}
302
303META_COLLECTOR(var_sk_bound_if)
304{
305 SKIP_NONLOCAL(skb);
306
d0075634 307 if (skb->sk->sk_bound_dev_if == 0) {
48900629
TG		 308 dst->value = (unsigned long) "any";
309 dst->len = 3;
d0075634 310 } else {
48900629 311 struct net_device *dev;
10297b99 312
d0075634 313 rcu_read_lock();
2939e275
ED		 314 dev = dev_get_by_index_rcu(sock_net(skb->sk),
315 skb->sk->sk_bound_dev_if);
48900629 316 *err = var_dev(dev, dst);
d0075634
ED		 317 rcu_read_unlock();
318 }
48900629
TG		 319}
320
321META_COLLECTOR(int_sk_refcnt)
322{
323 SKIP_NONLOCAL(skb);
324 dst->value = atomic_read(&skb->sk->sk_refcnt);
325}
326
327META_COLLECTOR(int_sk_rcvbuf)
328{
329 SKIP_NONLOCAL(skb);
330 dst->value = skb->sk->sk_rcvbuf;
331}
332
333META_COLLECTOR(int_sk_shutdown)
334{
335 SKIP_NONLOCAL(skb);
336 dst->value = skb->sk->sk_shutdown;
337}
338
339META_COLLECTOR(int_sk_proto)
340{
341 SKIP_NONLOCAL(skb);
342 dst->value = skb->sk->sk_protocol;
343}
344
345META_COLLECTOR(int_sk_type)
346{
347 SKIP_NONLOCAL(skb);
348 dst->value = skb->sk->sk_type;
349}
350
351META_COLLECTOR(int_sk_rmem_alloc)
352{
353 SKIP_NONLOCAL(skb);
31e6d363 354 dst->value = sk_rmem_alloc_get(skb->sk);
48900629
TG		 355}
356
357META_COLLECTOR(int_sk_wmem_alloc)
358{
359 SKIP_NONLOCAL(skb);
31e6d363 360 dst->value = sk_wmem_alloc_get(skb->sk);
48900629
TG		 361}
362
363META_COLLECTOR(int_sk_omem_alloc)
364{
365 SKIP_NONLOCAL(skb);
366 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
367}
368
369META_COLLECTOR(int_sk_rcv_qlen)
370{
371 SKIP_NONLOCAL(skb);
372 dst->value = skb->sk->sk_receive_queue.qlen;
373}
374
375META_COLLECTOR(int_sk_snd_qlen)
376{
377 SKIP_NONLOCAL(skb);
378 dst->value = skb->sk->sk_write_queue.qlen;
379}
380
381META_COLLECTOR(int_sk_wmem_queued)
382{
383 SKIP_NONLOCAL(skb);
384 dst->value = skb->sk->sk_wmem_queued;
385}
386
387META_COLLECTOR(int_sk_fwd_alloc)
388{
389 SKIP_NONLOCAL(skb);
390 dst->value = skb->sk->sk_forward_alloc;
391}
392
393META_COLLECTOR(int_sk_sndbuf)
394{
395 SKIP_NONLOCAL(skb);
396 dst->value = skb->sk->sk_sndbuf;
397}
398
399META_COLLECTOR(int_sk_alloc)
400{
401 SKIP_NONLOCAL(skb);
402 dst->value = skb->sk->sk_allocation;
403}
404
405META_COLLECTOR(int_sk_route_caps)
406{
407 SKIP_NONLOCAL(skb);
408 dst->value = skb->sk->sk_route_caps;
409}
410
81c3d547 411META_COLLECTOR(int_sk_hash)
48900629
TG		 412{
413 SKIP_NONLOCAL(skb);
81c3d547 414 dst->value = skb->sk->sk_hash;
48900629
TG		 415}
416
417META_COLLECTOR(int_sk_lingertime)
418{
419 SKIP_NONLOCAL(skb);
420 dst->value = skb->sk->sk_lingertime / HZ;
421}
422
423META_COLLECTOR(int_sk_err_qlen)
424{
425 SKIP_NONLOCAL(skb);
426 dst->value = skb->sk->sk_error_queue.qlen;
427}
428
429META_COLLECTOR(int_sk_ack_bl)
430{
431 SKIP_NONLOCAL(skb);
432 dst->value = skb->sk->sk_ack_backlog;
433}
434
435META_COLLECTOR(int_sk_max_ack_bl)
436{
437 SKIP_NONLOCAL(skb);
438 dst->value = skb->sk->sk_max_ack_backlog;
439}
440
441META_COLLECTOR(int_sk_prio)
442{
443 SKIP_NONLOCAL(skb);
444 dst->value = skb->sk->sk_priority;
445}
446
447META_COLLECTOR(int_sk_rcvlowat)
448{
449 SKIP_NONLOCAL(skb);
450 dst->value = skb->sk->sk_rcvlowat;
451}
452
453META_COLLECTOR(int_sk_rcvtimeo)
454{
455 SKIP_NONLOCAL(skb);
456 dst->value = skb->sk->sk_rcvtimeo / HZ;
457}
458
459META_COLLECTOR(int_sk_sndtimeo)
460{
461 SKIP_NONLOCAL(skb);
462 dst->value = skb->sk->sk_sndtimeo / HZ;
463}
464
465META_COLLECTOR(int_sk_sendmsg_off)
466{
467 SKIP_NONLOCAL(skb);
468 dst->value = skb->sk->sk_sndmsg_off;
469}
470
471META_COLLECTOR(int_sk_write_pend)
472{
473 SKIP_NONLOCAL(skb);
474 dst->value = skb->sk->sk_write_pending;
475}
476
1da177e4
LT		 477/**************************************************************************
478 * Meta value collectors assignment table
479 **************************************************************************/
480
481struct meta_ops
482{
483 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
484 struct meta_value *, struct meta_obj *, int *);
485};
486
48900629
TG		 487#define META_ID(name) TCF_META_ID_##name
488#define META_FUNC(name) { .get = meta_##name }
489
1da177e4
LT		 490/* Meta value operations table listing all meta value collectors and
491 * assigns them to a type and meta id. */
492static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
493 [TCF_META_TYPE_VAR] = {
48900629 494 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 495 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 496 },
497 [TCF_META_TYPE_INT] = {
48900629
TG		 498 [META_ID(RANDOM)] = META_FUNC(int_random),
499 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
500 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
501 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
502 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 503 [META_ID(PRIORITY)] = META_FUNC(int_priority),
504 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 505 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
506 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
507 [META_ID(DATALEN)] = META_FUNC(int_datalen),
508 [META_ID(MACLEN)] = META_FUNC(int_maclen),
82e91ffe 509 [META_ID(NFMARK)] = META_FUNC(int_mark),
48900629 510 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 511 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 512 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
513 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
514 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
515 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
516 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
517 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
518 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
519 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
520 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
521 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
522 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
523 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
524 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
525 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
526 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
527 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
528 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
529 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
530 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
531 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
532 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 533 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 534 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
535 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
536 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
537 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
538 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
539 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
540 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
541 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
542 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
3113e88c 543 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
1da177e4
LT		 544 }
545};
546
547static inline struct meta_ops * meta_ops(struct meta_value *val)
548{
549 return &__meta_ops[meta_type(val)][meta_id(val)];
550}
551
552/**************************************************************************
553 * Type specific operations for TCF_META_TYPE_VAR
554 **************************************************************************/
555
556static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
557{
558 int r = a->len - b->len;
559
560 if (r == 0)
561 r = memcmp((void *) a->value, (void *) b->value, a->len);
562
563 return r;
564}
565
add93b61 566static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 567{
add93b61 568 int len = nla_len(nla);
1da177e4 569
add93b61 570 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
1da177e4
LT		 571 if (dst->val == 0UL)
572 return -ENOMEM;
1da177e4
LT		 573 dst->len = len;
574 return 0;
575}
576
577static void meta_var_destroy(struct meta_value *v)
578{
a51482bd 579 kfree((void *) v->val);
1da177e4
LT		 580}
581
582static void meta_var_apply_extras(struct meta_value *v,
583 struct meta_obj *dst)
584{
585 int shift = v->hdr.shift;
586
587 if (shift && shift < dst->len)
588 dst->len -= shift;
589}
590
591static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
592{
593 if (v->val && v->len)
add93b61 594 NLA_PUT(skb, tlv, v->len, (void *) v->val);
1da177e4
LT		 595 return 0;
596
add93b61 597nla_put_failure:
1da177e4
LT		 598 return -1;
599}
600
601/**************************************************************************
602 * Type specific operations for TCF_META_TYPE_INT
603 **************************************************************************/
604
605static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
606{
607 /* Let gcc optimize it, the unlikely is not really based on
608 * some numbers but jump free code for mismatches seems
609 * more logical. */
98e56405 610 if (unlikely(a->value == b->value))
1da177e4 611 return 0;
98e56405 612 else if (a->value < b->value)
1da177e4
LT		 613 return -1;
614 else
615 return 1;
616}
617
add93b61 618static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 619{
add93b61
PM		 620 if (nla_len(nla) >= sizeof(unsigned long)) {
621 dst->val = *(unsigned long *) nla_data(nla);
1da177e4 622 dst->len = sizeof(unsigned long);
add93b61 623 } else if (nla_len(nla) == sizeof(u32)) {
1587bac4 624 dst->val = nla_get_u32(nla);
1da177e4
LT		 625 dst->len = sizeof(u32);
626 } else
627 return -EINVAL;
628
629 return 0;
630}
631
632static void meta_int_apply_extras(struct meta_value *v,
633 struct meta_obj *dst)
634{
635 if (v->hdr.shift)
636 dst->value >>= v->hdr.shift;
637
638 if (v->val)
639 dst->value &= v->val;
640}
641
642static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
643{
644 if (v->len == sizeof(unsigned long))
add93b61 645 NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
1da177e4 646 else if (v->len == sizeof(u32)) {
24beeab5 647 NLA_PUT_U32(skb, tlv, v->val);
1da177e4
LT		 648 }
649
650 return 0;
651
add93b61 652nla_put_failure:
1da177e4
LT		 653 return -1;
654}
655
656/**************************************************************************
657 * Type specific operations table
658 **************************************************************************/
659
660struct meta_type_ops
661{
662 void (*destroy)(struct meta_value *);
663 int (*compare)(struct meta_obj *, struct meta_obj *);
add93b61 664 int (*change)(struct meta_value *, struct nlattr *);
1da177e4
LT		 665 void (*apply_extras)(struct meta_value *, struct meta_obj *);
666 int (*dump)(struct sk_buff *, struct meta_value *, int);
667};
668
669static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
670 [TCF_META_TYPE_VAR] = {
671 .destroy = meta_var_destroy,
672 .compare = meta_var_compare,
673 .change = meta_var_change,
674 .apply_extras = meta_var_apply_extras,
675 .dump = meta_var_dump
676 },
677 [TCF_META_TYPE_INT] = {
678 .compare = meta_int_compare,
679 .change = meta_int_change,
680 .apply_extras = meta_int_apply_extras,
681 .dump = meta_int_dump
682 }
683};
684
685static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
686{
687 return &__meta_type_ops[meta_type(v)];
688}
689
690/**************************************************************************
691 * Core
692 **************************************************************************/
693
ed7af3b3
SH		 694static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
695 struct meta_value *v, struct meta_obj *dst)
1da177e4
LT		 696{
697 int err = 0;
698
699 if (meta_id(v) == TCF_META_ID_VALUE) {
700 dst->value = v->val;
701 dst->len = v->len;
702 return 0;
703 }
704
705 meta_ops(v)->get(skb, info, v, dst, &err);
706 if (err < 0)
707 return err;
708
709 if (meta_type_ops(v)->apply_extras)
710 meta_type_ops(v)->apply_extras(v, dst);
711
712 return 0;
713}
714
715static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
716 struct tcf_pkt_info *info)
717{
718 int r;
719 struct meta_match *meta = (struct meta_match *) m->data;
720 struct meta_obj l_value, r_value;
721
722 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
723 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
724 return 0;
725
726 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
727
728 switch (meta->lvalue.hdr.op) {
729 case TCF_EM_OPND_EQ:
730 return !r;
731 case TCF_EM_OPND_LT:
732 return r < 0;
733 case TCF_EM_OPND_GT:
734 return r > 0;
735 }
736
737 return 0;
738}
739
ed7af3b3 740static void meta_delete(struct meta_match *meta)
1da177e4 741{
04f217ac
SH		 742 if (meta) {
743 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
1da177e4 744
04f217ac
SH		 745 if (ops && ops->destroy) {
746 ops->destroy(&meta->lvalue);
747 ops->destroy(&meta->rvalue);
748 }
1da177e4
LT		 749 }
750
751 kfree(meta);
752}
753
add93b61 754static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
1da177e4 755{
add93b61
PM		 756 if (nla) {
757 if (nla_len(nla) == 0)
1da177e4
LT		 758 return -EINVAL;
759
add93b61 760 return meta_type_ops(dst)->change(dst, nla);
1da177e4
LT		 761 }
762
763 return 0;
764}
765
766static inline int meta_is_supported(struct meta_value *val)
767{
768 return (!meta_id(val) || meta_ops(val)->get);
769}
770
7a9c1bd4
PM		 771static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
772 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
773};
774
1da177e4
LT		 775static int em_meta_change(struct tcf_proto *tp, void *data, int len,
776 struct tcf_ematch *m)
777{
cee63723 778 int err;
add93b61 779 struct nlattr *tb[TCA_EM_META_MAX + 1];
1da177e4
LT		 780 struct tcf_meta_hdr *hdr;
781 struct meta_match *meta = NULL;
10297b99 782
7a9c1bd4 783 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
cee63723 784 if (err < 0)
1da177e4
LT		 785 goto errout;
786
cee63723 787 err = -EINVAL;
7a9c1bd4 788 if (tb[TCA_EM_META_HDR] == NULL)
1da177e4 789 goto errout;
add93b61 790 hdr = nla_data(tb[TCA_EM_META_HDR]);
1da177e4
LT		 791
792 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
793 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
794 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
795 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
796 goto errout;
797
0da974f4 798 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 799 if (meta == NULL)
800 goto errout;
1da177e4
LT		 801
802 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
803 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
804
805 if (!meta_is_supported(&meta->lvalue) ||
806 !meta_is_supported(&meta->rvalue)) {
807 err = -EOPNOTSUPP;
808 goto errout;
809 }
810
add93b61
PM		 811 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
812 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
1da177e4
LT		 813 goto errout;
814
815 m->datalen = sizeof(*meta);
816 m->data = (unsigned long) meta;
817
818 err = 0;
819errout:
820 if (err && meta)
821 meta_delete(meta);
822 return err;
823}
824
825static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
826{
827 if (m)
828 meta_delete((struct meta_match *) m->data);
829}
830
831static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
832{
833 struct meta_match *meta = (struct meta_match *) em->data;
834 struct tcf_meta_hdr hdr;
835 struct meta_type_ops *ops;
836
837 memset(&hdr, 0, sizeof(hdr));
838 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
839 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
840
add93b61 841 NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
1da177e4
LT		 842
843 ops = meta_type_ops(&meta->lvalue);
844 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
845 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
add93b61 846 goto nla_put_failure;
1da177e4
LT		 847
848 return 0;
849
add93b61 850nla_put_failure:
1da177e4 851 return -1;
10297b99 852}
1da177e4
LT		 853
854static struct tcf_ematch_ops em_meta_ops = {
855 .kind = TCF_EM_META,
856 .change = em_meta_change,
857 .match = em_meta_match,
858 .destroy = em_meta_destroy,
859 .dump = em_meta_dump,
860 .owner = THIS_MODULE,
861 .link = LIST_HEAD_INIT(em_meta_ops.link)
862};
863
864static int __init init_em_meta(void)
865{
866 return tcf_em_register(&em_meta_ops);
867}
868
10297b99 869static void __exit exit_em_meta(void)
1da177e4
LT		 870{
871 tcf_em_unregister(&em_meta_ops);
872}
873
874MODULE_LICENSE("GPL");
875
876module_init(init_em_meta);
877module_exit(exit_em_meta);
db3d99c0
PM		 878
879MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
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