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crypto: convert crypto.h to UTF-8
[deliverable/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 <tgraf@suug.ch>
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
58 * only available if that subsytem is enabled in the kernel.
59 */
60
1da177e4
LT		 61#include <linux/module.h>
62#include <linux/types.h>
63#include <linux/kernel.h>
64#include <linux/sched.h>
65#include <linux/string.h>
66#include <linux/skbuff.h>
67#include <linux/random.h>
68#include <linux/tc_ematch/tc_em_meta.h>
69#include <net/dst.h>
70#include <net/route.h>
71#include <net/pkt_cls.h>
48900629 72#include <net/sock.h>
1da177e4
LT		 73
74struct meta_obj
75{
76 unsigned long value;
77 unsigned int len;
78};
79
80struct meta_value
81{
82 struct tcf_meta_val hdr;
83 unsigned long val;
84 unsigned int len;
85};
86
87struct meta_match
88{
89 struct meta_value lvalue;
90 struct meta_value rvalue;
91};
92
93static inline int meta_id(struct meta_value *v)
94{
95 return TCF_META_ID(v->hdr.kind);
96}
97
98static inline int meta_type(struct meta_value *v)
99{
100 return TCF_META_TYPE(v->hdr.kind);
101}
102
103#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
104 struct tcf_pkt_info *info, struct meta_value *v, \
105 struct meta_obj *dst, int *err)
106
107/**************************************************************************
108 * System status & misc
109 **************************************************************************/
110
111META_COLLECTOR(int_random)
112{
113 get_random_bytes(&dst->value, sizeof(dst->value));
114}
115
116static inline unsigned long fixed_loadavg(int load)
117{
118 int rnd_load = load + (FIXED_1/200);
119 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
120
121 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
122}
123
124META_COLLECTOR(int_loadavg_0)
125{
126 dst->value = fixed_loadavg(avenrun[0]);
127}
128
129META_COLLECTOR(int_loadavg_1)
130{
131 dst->value = fixed_loadavg(avenrun[1]);
132}
133
134META_COLLECTOR(int_loadavg_2)
135{
136 dst->value = fixed_loadavg(avenrun[2]);
137}
138
139/**************************************************************************
140 * Device names & indices
141 **************************************************************************/
142
143static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
144{
145 if (unlikely(dev == NULL))
146 return -1;
147
148 dst->value = dev->ifindex;
149 return 0;
150}
151
152static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
153{
154 if (unlikely(dev == NULL))
155 return -1;
156
157 dst->value = (unsigned long) dev->name;
158 dst->len = strlen(dev->name);
159 return 0;
160}
161
162META_COLLECTOR(int_dev)
163{
164 *err = int_dev(skb->dev, dst);
165}
166
167META_COLLECTOR(var_dev)
168{
169 *err = var_dev(skb->dev, dst);
170}
171
1da177e4
LT		 172/**************************************************************************
173 * skb attributes
174 **************************************************************************/
175
176META_COLLECTOR(int_priority)
177{
178 dst->value = skb->priority;
179}
180
181META_COLLECTOR(int_protocol)
182{
183 /* Let userspace take care of the byte ordering */
184 dst->value = skb->protocol;
185}
186
1da177e4
LT		 187META_COLLECTOR(int_pkttype)
188{
189 dst->value = skb->pkt_type;
190}
191
192META_COLLECTOR(int_pktlen)
193{
194 dst->value = skb->len;
195}
196
197META_COLLECTOR(int_datalen)
198{
199 dst->value = skb->data_len;
200}
201
202META_COLLECTOR(int_maclen)
203{
204 dst->value = skb->mac_len;
205}
206
207/**************************************************************************
208 * Netfilter
209 **************************************************************************/
210
82e91ffe 211META_COLLECTOR(int_mark)
1da177e4 212{
82e91ffe 213 dst->value = skb->mark;
7686ee1a 214}
1da177e4
LT		 215
216/**************************************************************************
217 * Traffic Control
218 **************************************************************************/
219
220META_COLLECTOR(int_tcindex)
221{
222 dst->value = skb->tc_index;
223}
224
1da177e4
LT		 225/**************************************************************************
226 * Routing
227 **************************************************************************/
228
1da177e4
LT		 229META_COLLECTOR(int_rtclassid)
230{
231 if (unlikely(skb->dst == NULL))
232 *err = -1;
233 else
7686ee1a 234#ifdef CONFIG_NET_CLS_ROUTE
1da177e4 235 dst->value = skb->dst->tclassid;
7686ee1a
PM		 236#else
237 dst->value = 0;
1da177e4 238#endif
7686ee1a 239}
1da177e4
LT		 240
241META_COLLECTOR(int_rtiif)
242{
243 if (unlikely(skb->dst == NULL))
244 *err = -1;
245 else
246 dst->value = ((struct rtable*) skb->dst)->fl.iif;
247}
248
48900629
TG		 249/**************************************************************************
250 * Socket Attributes
251 **************************************************************************/
252
253#define SKIP_NONLOCAL(skb) \
254 if (unlikely(skb->sk == NULL)) { \
255 *err = -1; \
256 return; \
257 }
258
259META_COLLECTOR(int_sk_family)
260{
261 SKIP_NONLOCAL(skb);
262 dst->value = skb->sk->sk_family;
263}
264
265META_COLLECTOR(int_sk_state)
266{
267 SKIP_NONLOCAL(skb);
268 dst->value = skb->sk->sk_state;
269}
270
271META_COLLECTOR(int_sk_reuse)
272{
273 SKIP_NONLOCAL(skb);
274 dst->value = skb->sk->sk_reuse;
275}
276
277META_COLLECTOR(int_sk_bound_if)
278{
279 SKIP_NONLOCAL(skb);
280 /* No error if bound_dev_if is 0, legal userspace check */
281 dst->value = skb->sk->sk_bound_dev_if;
282}
283
284META_COLLECTOR(var_sk_bound_if)
285{
286 SKIP_NONLOCAL(skb);
287
288 if (skb->sk->sk_bound_dev_if == 0) {
289 dst->value = (unsigned long) "any";
290 dst->len = 3;
291 } else {
292 struct net_device *dev;
10297b99 293
881d966b 294 dev = dev_get_by_index(&init_net, skb->sk->sk_bound_dev_if);
48900629
TG		 295 *err = var_dev(dev, dst);
296 if (dev)
297 dev_put(dev);
298 }
299}
300
301META_COLLECTOR(int_sk_refcnt)
302{
303 SKIP_NONLOCAL(skb);
304 dst->value = atomic_read(&skb->sk->sk_refcnt);
305}
306
307META_COLLECTOR(int_sk_rcvbuf)
308{
309 SKIP_NONLOCAL(skb);
310 dst->value = skb->sk->sk_rcvbuf;
311}
312
313META_COLLECTOR(int_sk_shutdown)
314{
315 SKIP_NONLOCAL(skb);
316 dst->value = skb->sk->sk_shutdown;
317}
318
319META_COLLECTOR(int_sk_proto)
320{
321 SKIP_NONLOCAL(skb);
322 dst->value = skb->sk->sk_protocol;
323}
324
325META_COLLECTOR(int_sk_type)
326{
327 SKIP_NONLOCAL(skb);
328 dst->value = skb->sk->sk_type;
329}
330
331META_COLLECTOR(int_sk_rmem_alloc)
332{
333 SKIP_NONLOCAL(skb);
334 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
335}
336
337META_COLLECTOR(int_sk_wmem_alloc)
338{
339 SKIP_NONLOCAL(skb);
340 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
341}
342
343META_COLLECTOR(int_sk_omem_alloc)
344{
345 SKIP_NONLOCAL(skb);
346 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
347}
348
349META_COLLECTOR(int_sk_rcv_qlen)
350{
351 SKIP_NONLOCAL(skb);
352 dst->value = skb->sk->sk_receive_queue.qlen;
353}
354
355META_COLLECTOR(int_sk_snd_qlen)
356{
357 SKIP_NONLOCAL(skb);
358 dst->value = skb->sk->sk_write_queue.qlen;
359}
360
361META_COLLECTOR(int_sk_wmem_queued)
362{
363 SKIP_NONLOCAL(skb);
364 dst->value = skb->sk->sk_wmem_queued;
365}
366
367META_COLLECTOR(int_sk_fwd_alloc)
368{
369 SKIP_NONLOCAL(skb);
370 dst->value = skb->sk->sk_forward_alloc;
371}
372
373META_COLLECTOR(int_sk_sndbuf)
374{
375 SKIP_NONLOCAL(skb);
376 dst->value = skb->sk->sk_sndbuf;
377}
378
379META_COLLECTOR(int_sk_alloc)
380{
381 SKIP_NONLOCAL(skb);
382 dst->value = skb->sk->sk_allocation;
383}
384
385META_COLLECTOR(int_sk_route_caps)
386{
387 SKIP_NONLOCAL(skb);
388 dst->value = skb->sk->sk_route_caps;
389}
390
81c3d547 391META_COLLECTOR(int_sk_hash)
48900629
TG		 392{
393 SKIP_NONLOCAL(skb);
81c3d547 394 dst->value = skb->sk->sk_hash;
48900629
TG		 395}
396
397META_COLLECTOR(int_sk_lingertime)
398{
399 SKIP_NONLOCAL(skb);
400 dst->value = skb->sk->sk_lingertime / HZ;
401}
402
403META_COLLECTOR(int_sk_err_qlen)
404{
405 SKIP_NONLOCAL(skb);
406 dst->value = skb->sk->sk_error_queue.qlen;
407}
408
409META_COLLECTOR(int_sk_ack_bl)
410{
411 SKIP_NONLOCAL(skb);
412 dst->value = skb->sk->sk_ack_backlog;
413}
414
415META_COLLECTOR(int_sk_max_ack_bl)
416{
417 SKIP_NONLOCAL(skb);
418 dst->value = skb->sk->sk_max_ack_backlog;
419}
420
421META_COLLECTOR(int_sk_prio)
422{
423 SKIP_NONLOCAL(skb);
424 dst->value = skb->sk->sk_priority;
425}
426
427META_COLLECTOR(int_sk_rcvlowat)
428{
429 SKIP_NONLOCAL(skb);
430 dst->value = skb->sk->sk_rcvlowat;
431}
432
433META_COLLECTOR(int_sk_rcvtimeo)
434{
435 SKIP_NONLOCAL(skb);
436 dst->value = skb->sk->sk_rcvtimeo / HZ;
437}
438
439META_COLLECTOR(int_sk_sndtimeo)
440{
441 SKIP_NONLOCAL(skb);
442 dst->value = skb->sk->sk_sndtimeo / HZ;
443}
444
445META_COLLECTOR(int_sk_sendmsg_off)
446{
447 SKIP_NONLOCAL(skb);
448 dst->value = skb->sk->sk_sndmsg_off;
449}
450
451META_COLLECTOR(int_sk_write_pend)
452{
453 SKIP_NONLOCAL(skb);
454 dst->value = skb->sk->sk_write_pending;
455}
456
1da177e4
LT		 457/**************************************************************************
458 * Meta value collectors assignment table
459 **************************************************************************/
460
461struct meta_ops
462{
463 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
464 struct meta_value *, struct meta_obj *, int *);
465};
466
48900629
TG		 467#define META_ID(name) TCF_META_ID_##name
468#define META_FUNC(name) { .get = meta_##name }
469
1da177e4
LT		 470/* Meta value operations table listing all meta value collectors and
471 * assigns them to a type and meta id. */
472static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
473 [TCF_META_TYPE_VAR] = {
48900629 474 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 475 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 476 },
477 [TCF_META_TYPE_INT] = {
48900629
TG		 478 [META_ID(RANDOM)] = META_FUNC(int_random),
479 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
480 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
481 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
482 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 483 [META_ID(PRIORITY)] = META_FUNC(int_priority),
484 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 485 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
486 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
487 [META_ID(DATALEN)] = META_FUNC(int_datalen),
488 [META_ID(MACLEN)] = META_FUNC(int_maclen),
82e91ffe 489 [META_ID(NFMARK)] = META_FUNC(int_mark),
48900629 490 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 491 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 492 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
493 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
494 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
495 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
496 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
497 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
498 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
499 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
500 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
501 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
502 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
503 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
504 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
505 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
506 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
507 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
508 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
509 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
510 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
511 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
512 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 513 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 514 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
515 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
516 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
517 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
518 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
519 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
520 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
521 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
522 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
1da177e4
LT		 523 }
524};
525
526static inline struct meta_ops * meta_ops(struct meta_value *val)
527{
528 return &__meta_ops[meta_type(val)][meta_id(val)];
529}
530
531/**************************************************************************
532 * Type specific operations for TCF_META_TYPE_VAR
533 **************************************************************************/
534
535static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
536{
537 int r = a->len - b->len;
538
539 if (r == 0)
540 r = memcmp((void *) a->value, (void *) b->value, a->len);
541
542 return r;
543}
544
545static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
546{
547 int len = RTA_PAYLOAD(rta);
548
c7b1b249 549 dst->val = (unsigned long)kmemdup(RTA_DATA(rta), len, GFP_KERNEL);
1da177e4
LT		 550 if (dst->val == 0UL)
551 return -ENOMEM;
1da177e4
LT		 552 dst->len = len;
553 return 0;
554}
555
556static void meta_var_destroy(struct meta_value *v)
557{
a51482bd 558 kfree((void *) v->val);
1da177e4
LT		 559}
560
561static void meta_var_apply_extras(struct meta_value *v,
562 struct meta_obj *dst)
563{
564 int shift = v->hdr.shift;
565
566 if (shift && shift < dst->len)
567 dst->len -= shift;
568}
569
570static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
571{
572 if (v->val && v->len)
573 RTA_PUT(skb, tlv, v->len, (void *) v->val);
574 return 0;
575
576rtattr_failure:
577 return -1;
578}
579
580/**************************************************************************
581 * Type specific operations for TCF_META_TYPE_INT
582 **************************************************************************/
583
584static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
585{
586 /* Let gcc optimize it, the unlikely is not really based on
587 * some numbers but jump free code for mismatches seems
588 * more logical. */
98e56405 589 if (unlikely(a->value == b->value))
1da177e4 590 return 0;
98e56405 591 else if (a->value < b->value)
1da177e4
LT		 592 return -1;
593 else
594 return 1;
595}
596
597static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
598{
599 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
600 dst->val = *(unsigned long *) RTA_DATA(rta);
601 dst->len = sizeof(unsigned long);
602 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
603 dst->val = *(u32 *) RTA_DATA(rta);
604 dst->len = sizeof(u32);
605 } else
606 return -EINVAL;
607
608 return 0;
609}
610
611static void meta_int_apply_extras(struct meta_value *v,
612 struct meta_obj *dst)
613{
614 if (v->hdr.shift)
615 dst->value >>= v->hdr.shift;
616
617 if (v->val)
618 dst->value &= v->val;
619}
620
621static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
622{
623 if (v->len == sizeof(unsigned long))
624 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
625 else if (v->len == sizeof(u32)) {
626 u32 d = v->val;
627 RTA_PUT(skb, tlv, sizeof(d), &d);
628 }
629
630 return 0;
631
632rtattr_failure:
633 return -1;
634}
635
636/**************************************************************************
637 * Type specific operations table
638 **************************************************************************/
639
640struct meta_type_ops
641{
642 void (*destroy)(struct meta_value *);
643 int (*compare)(struct meta_obj *, struct meta_obj *);
644 int (*change)(struct meta_value *, struct rtattr *);
645 void (*apply_extras)(struct meta_value *, struct meta_obj *);
646 int (*dump)(struct sk_buff *, struct meta_value *, int);
647};
648
649static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
650 [TCF_META_TYPE_VAR] = {
651 .destroy = meta_var_destroy,
652 .compare = meta_var_compare,
653 .change = meta_var_change,
654 .apply_extras = meta_var_apply_extras,
655 .dump = meta_var_dump
656 },
657 [TCF_META_TYPE_INT] = {
658 .compare = meta_int_compare,
659 .change = meta_int_change,
660 .apply_extras = meta_int_apply_extras,
661 .dump = meta_int_dump
662 }
663};
664
665static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
666{
667 return &__meta_type_ops[meta_type(v)];
668}
669
670/**************************************************************************
671 * Core
672 **************************************************************************/
673
10297b99 674static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
1da177e4
LT		 675 struct meta_value *v, struct meta_obj *dst)
676{
677 int err = 0;
678
679 if (meta_id(v) == TCF_META_ID_VALUE) {
680 dst->value = v->val;
681 dst->len = v->len;
682 return 0;
683 }
684
685 meta_ops(v)->get(skb, info, v, dst, &err);
686 if (err < 0)
687 return err;
688
689 if (meta_type_ops(v)->apply_extras)
690 meta_type_ops(v)->apply_extras(v, dst);
691
692 return 0;
693}
694
695static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
696 struct tcf_pkt_info *info)
697{
698 int r;
699 struct meta_match *meta = (struct meta_match *) m->data;
700 struct meta_obj l_value, r_value;
701
702 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
703 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
704 return 0;
705
706 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
707
708 switch (meta->lvalue.hdr.op) {
709 case TCF_EM_OPND_EQ:
710 return !r;
711 case TCF_EM_OPND_LT:
712 return r < 0;
713 case TCF_EM_OPND_GT:
714 return r > 0;
715 }
716
717 return 0;
718}
719
720static inline void meta_delete(struct meta_match *meta)
721{
722 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
723
724 if (ops && ops->destroy) {
725 ops->destroy(&meta->lvalue);
726 ops->destroy(&meta->rvalue);
727 }
728
729 kfree(meta);
730}
731
732static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
733{
734 if (rta) {
735 if (RTA_PAYLOAD(rta) == 0)
736 return -EINVAL;
737
738 return meta_type_ops(dst)->change(dst, rta);
739 }
740
741 return 0;
742}
743
744static inline int meta_is_supported(struct meta_value *val)
745{
746 return (!meta_id(val) || meta_ops(val)->get);
747}
748
749static int em_meta_change(struct tcf_proto *tp, void *data, int len,
750 struct tcf_ematch *m)
751{
752 int err = -EINVAL;
753 struct rtattr *tb[TCA_EM_META_MAX];
754 struct tcf_meta_hdr *hdr;
755 struct meta_match *meta = NULL;
10297b99 756
1da177e4
LT		 757 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
758 goto errout;
759
760 if (tb[TCA_EM_META_HDR-1] == NULL ||
761 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
762 goto errout;
763 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
764
765 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
766 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
767 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
768 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
769 goto errout;
770
0da974f4 771 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 772 if (meta == NULL)
773 goto errout;
1da177e4
LT		 774
775 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
776 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
777
778 if (!meta_is_supported(&meta->lvalue) ||
779 !meta_is_supported(&meta->rvalue)) {
780 err = -EOPNOTSUPP;
781 goto errout;
782 }
783
784 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
785 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
786 goto errout;
787
788 m->datalen = sizeof(*meta);
789 m->data = (unsigned long) meta;
790
791 err = 0;
792errout:
793 if (err && meta)
794 meta_delete(meta);
795 return err;
796}
797
798static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
799{
800 if (m)
801 meta_delete((struct meta_match *) m->data);
802}
803
804static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
805{
806 struct meta_match *meta = (struct meta_match *) em->data;
807 struct tcf_meta_hdr hdr;
808 struct meta_type_ops *ops;
809
810 memset(&hdr, 0, sizeof(hdr));
811 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
812 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
813
814 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
815
816 ops = meta_type_ops(&meta->lvalue);
817 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
818 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
819 goto rtattr_failure;
820
821 return 0;
822
823rtattr_failure:
824 return -1;
10297b99 825}
1da177e4
LT		 826
827static struct tcf_ematch_ops em_meta_ops = {
828 .kind = TCF_EM_META,
829 .change = em_meta_change,
830 .match = em_meta_match,
831 .destroy = em_meta_destroy,
832 .dump = em_meta_dump,
833 .owner = THIS_MODULE,
834 .link = LIST_HEAD_INIT(em_meta_ops.link)
835};
836
837static int __init init_em_meta(void)
838{
839 return tcf_em_register(&em_meta_ops);
840}
841
10297b99 842static void __exit exit_em_meta(void)
1da177e4
LT		 843{
844 tcf_em_unregister(&em_meta_ops);
845}
846
847MODULE_LICENSE("GPL");
848
849module_init(init_em_meta);
850module_exit(exit_em_meta);
db3d99c0
PM		 851
852MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
Linux kernel - Deliverables
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