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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux.git] / net / sched / em_meta.c
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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 * ==========================================================================
12 *
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
1da177e4
LT		 211META_COLLECTOR(int_nfmark)
212{
7686ee1a 213#ifdef CONFIG_NETFILTER
1da177e4 214 dst->value = skb->nfmark;
7686ee1a
PM		 215#else
216 dst->value = 0;
1da177e4 217#endif
7686ee1a 218}
1da177e4
LT		 219
220/**************************************************************************
221 * Traffic Control
222 **************************************************************************/
223
224META_COLLECTOR(int_tcindex)
225{
226 dst->value = skb->tc_index;
227}
228
1da177e4
LT		 229/**************************************************************************
230 * Routing
231 **************************************************************************/
232
1da177e4
LT		 233META_COLLECTOR(int_rtclassid)
234{
235 if (unlikely(skb->dst == NULL))
236 *err = -1;
237 else
7686ee1a 238#ifdef CONFIG_NET_CLS_ROUTE
1da177e4 239 dst->value = skb->dst->tclassid;
7686ee1a
PM		 240#else
241 dst->value = 0;
1da177e4 242#endif
7686ee1a 243}
1da177e4
LT		 244
245META_COLLECTOR(int_rtiif)
246{
247 if (unlikely(skb->dst == NULL))
248 *err = -1;
249 else
250 dst->value = ((struct rtable*) skb->dst)->fl.iif;
251}
252
48900629
TG		 253/**************************************************************************
254 * Socket Attributes
255 **************************************************************************/
256
257#define SKIP_NONLOCAL(skb) \
258 if (unlikely(skb->sk == NULL)) { \
259 *err = -1; \
260 return; \
261 }
262
263META_COLLECTOR(int_sk_family)
264{
265 SKIP_NONLOCAL(skb);
266 dst->value = skb->sk->sk_family;
267}
268
269META_COLLECTOR(int_sk_state)
270{
271 SKIP_NONLOCAL(skb);
272 dst->value = skb->sk->sk_state;
273}
274
275META_COLLECTOR(int_sk_reuse)
276{
277 SKIP_NONLOCAL(skb);
278 dst->value = skb->sk->sk_reuse;
279}
280
281META_COLLECTOR(int_sk_bound_if)
282{
283 SKIP_NONLOCAL(skb);
284 /* No error if bound_dev_if is 0, legal userspace check */
285 dst->value = skb->sk->sk_bound_dev_if;
286}
287
288META_COLLECTOR(var_sk_bound_if)
289{
290 SKIP_NONLOCAL(skb);
291
292 if (skb->sk->sk_bound_dev_if == 0) {
293 dst->value = (unsigned long) "any";
294 dst->len = 3;
295 } else {
296 struct net_device *dev;
297
298 dev = dev_get_by_index(skb->sk->sk_bound_dev_if);
299 *err = var_dev(dev, dst);
300 if (dev)
301 dev_put(dev);
302 }
303}
304
305META_COLLECTOR(int_sk_refcnt)
306{
307 SKIP_NONLOCAL(skb);
308 dst->value = atomic_read(&skb->sk->sk_refcnt);
309}
310
311META_COLLECTOR(int_sk_rcvbuf)
312{
313 SKIP_NONLOCAL(skb);
314 dst->value = skb->sk->sk_rcvbuf;
315}
316
317META_COLLECTOR(int_sk_shutdown)
318{
319 SKIP_NONLOCAL(skb);
320 dst->value = skb->sk->sk_shutdown;
321}
322
323META_COLLECTOR(int_sk_proto)
324{
325 SKIP_NONLOCAL(skb);
326 dst->value = skb->sk->sk_protocol;
327}
328
329META_COLLECTOR(int_sk_type)
330{
331 SKIP_NONLOCAL(skb);
332 dst->value = skb->sk->sk_type;
333}
334
335META_COLLECTOR(int_sk_rmem_alloc)
336{
337 SKIP_NONLOCAL(skb);
338 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
339}
340
341META_COLLECTOR(int_sk_wmem_alloc)
342{
343 SKIP_NONLOCAL(skb);
344 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
345}
346
347META_COLLECTOR(int_sk_omem_alloc)
348{
349 SKIP_NONLOCAL(skb);
350 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
351}
352
353META_COLLECTOR(int_sk_rcv_qlen)
354{
355 SKIP_NONLOCAL(skb);
356 dst->value = skb->sk->sk_receive_queue.qlen;
357}
358
359META_COLLECTOR(int_sk_snd_qlen)
360{
361 SKIP_NONLOCAL(skb);
362 dst->value = skb->sk->sk_write_queue.qlen;
363}
364
365META_COLLECTOR(int_sk_wmem_queued)
366{
367 SKIP_NONLOCAL(skb);
368 dst->value = skb->sk->sk_wmem_queued;
369}
370
371META_COLLECTOR(int_sk_fwd_alloc)
372{
373 SKIP_NONLOCAL(skb);
374 dst->value = skb->sk->sk_forward_alloc;
375}
376
377META_COLLECTOR(int_sk_sndbuf)
378{
379 SKIP_NONLOCAL(skb);
380 dst->value = skb->sk->sk_sndbuf;
381}
382
383META_COLLECTOR(int_sk_alloc)
384{
385 SKIP_NONLOCAL(skb);
386 dst->value = skb->sk->sk_allocation;
387}
388
389META_COLLECTOR(int_sk_route_caps)
390{
391 SKIP_NONLOCAL(skb);
392 dst->value = skb->sk->sk_route_caps;
393}
394
81c3d547 395META_COLLECTOR(int_sk_hash)
48900629
TG		 396{
397 SKIP_NONLOCAL(skb);
81c3d547 398 dst->value = skb->sk->sk_hash;
48900629
TG		 399}
400
401META_COLLECTOR(int_sk_lingertime)
402{
403 SKIP_NONLOCAL(skb);
404 dst->value = skb->sk->sk_lingertime / HZ;
405}
406
407META_COLLECTOR(int_sk_err_qlen)
408{
409 SKIP_NONLOCAL(skb);
410 dst->value = skb->sk->sk_error_queue.qlen;
411}
412
413META_COLLECTOR(int_sk_ack_bl)
414{
415 SKIP_NONLOCAL(skb);
416 dst->value = skb->sk->sk_ack_backlog;
417}
418
419META_COLLECTOR(int_sk_max_ack_bl)
420{
421 SKIP_NONLOCAL(skb);
422 dst->value = skb->sk->sk_max_ack_backlog;
423}
424
425META_COLLECTOR(int_sk_prio)
426{
427 SKIP_NONLOCAL(skb);
428 dst->value = skb->sk->sk_priority;
429}
430
431META_COLLECTOR(int_sk_rcvlowat)
432{
433 SKIP_NONLOCAL(skb);
434 dst->value = skb->sk->sk_rcvlowat;
435}
436
437META_COLLECTOR(int_sk_rcvtimeo)
438{
439 SKIP_NONLOCAL(skb);
440 dst->value = skb->sk->sk_rcvtimeo / HZ;
441}
442
443META_COLLECTOR(int_sk_sndtimeo)
444{
445 SKIP_NONLOCAL(skb);
446 dst->value = skb->sk->sk_sndtimeo / HZ;
447}
448
449META_COLLECTOR(int_sk_sendmsg_off)
450{
451 SKIP_NONLOCAL(skb);
452 dst->value = skb->sk->sk_sndmsg_off;
453}
454
455META_COLLECTOR(int_sk_write_pend)
456{
457 SKIP_NONLOCAL(skb);
458 dst->value = skb->sk->sk_write_pending;
459}
460
1da177e4
LT		 461/**************************************************************************
462 * Meta value collectors assignment table
463 **************************************************************************/
464
465struct meta_ops
466{
467 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
468 struct meta_value *, struct meta_obj *, int *);
469};
470
48900629
TG		 471#define META_ID(name) TCF_META_ID_##name
472#define META_FUNC(name) { .get = meta_##name }
473
1da177e4
LT		 474/* Meta value operations table listing all meta value collectors and
475 * assigns them to a type and meta id. */
476static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
477 [TCF_META_TYPE_VAR] = {
48900629 478 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 479 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 480 },
481 [TCF_META_TYPE_INT] = {
48900629
TG		 482 [META_ID(RANDOM)] = META_FUNC(int_random),
483 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
484 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
485 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
486 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 487 [META_ID(PRIORITY)] = META_FUNC(int_priority),
488 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 489 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
490 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
491 [META_ID(DATALEN)] = META_FUNC(int_datalen),
492 [META_ID(MACLEN)] = META_FUNC(int_maclen),
48900629 493 [META_ID(NFMARK)] = META_FUNC(int_nfmark),
48900629 494 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 495 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 496 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
497 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
498 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
499 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
500 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
501 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
502 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
503 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
504 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
505 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
506 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
507 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
508 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
509 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
510 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
511 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
512 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
513 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
514 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
515 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
516 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 517 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 518 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
519 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
520 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
521 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
522 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
523 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
524 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
525 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
526 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
1da177e4
LT		 527 }
528};
529
530static inline struct meta_ops * meta_ops(struct meta_value *val)
531{
532 return &__meta_ops[meta_type(val)][meta_id(val)];
533}
534
535/**************************************************************************
536 * Type specific operations for TCF_META_TYPE_VAR
537 **************************************************************************/
538
539static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
540{
541 int r = a->len - b->len;
542
543 if (r == 0)
544 r = memcmp((void *) a->value, (void *) b->value, a->len);
545
546 return r;
547}
548
549static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
550{
551 int len = RTA_PAYLOAD(rta);
552
553 dst->val = (unsigned long) kmalloc(len, GFP_KERNEL);
554 if (dst->val == 0UL)
555 return -ENOMEM;
556 memcpy((void *) dst->val, RTA_DATA(rta), len);
557 dst->len = len;
558 return 0;
559}
560
561static void meta_var_destroy(struct meta_value *v)
562{
a51482bd 563 kfree((void *) v->val);
1da177e4
LT		 564}
565
566static void meta_var_apply_extras(struct meta_value *v,
567 struct meta_obj *dst)
568{
569 int shift = v->hdr.shift;
570
571 if (shift && shift < dst->len)
572 dst->len -= shift;
573}
574
575static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
576{
577 if (v->val && v->len)
578 RTA_PUT(skb, tlv, v->len, (void *) v->val);
579 return 0;
580
581rtattr_failure:
582 return -1;
583}
584
585/**************************************************************************
586 * Type specific operations for TCF_META_TYPE_INT
587 **************************************************************************/
588
589static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
590{
591 /* Let gcc optimize it, the unlikely is not really based on
592 * some numbers but jump free code for mismatches seems
593 * more logical. */
98e56405 594 if (unlikely(a->value == b->value))
1da177e4 595 return 0;
98e56405 596 else if (a->value < b->value)
1da177e4
LT		 597 return -1;
598 else
599 return 1;
600}
601
602static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
603{
604 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
605 dst->val = *(unsigned long *) RTA_DATA(rta);
606 dst->len = sizeof(unsigned long);
607 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
608 dst->val = *(u32 *) RTA_DATA(rta);
609 dst->len = sizeof(u32);
610 } else
611 return -EINVAL;
612
613 return 0;
614}
615
616static void meta_int_apply_extras(struct meta_value *v,
617 struct meta_obj *dst)
618{
619 if (v->hdr.shift)
620 dst->value >>= v->hdr.shift;
621
622 if (v->val)
623 dst->value &= v->val;
624}
625
626static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
627{
628 if (v->len == sizeof(unsigned long))
629 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
630 else if (v->len == sizeof(u32)) {
631 u32 d = v->val;
632 RTA_PUT(skb, tlv, sizeof(d), &d);
633 }
634
635 return 0;
636
637rtattr_failure:
638 return -1;
639}
640
641/**************************************************************************
642 * Type specific operations table
643 **************************************************************************/
644
645struct meta_type_ops
646{
647 void (*destroy)(struct meta_value *);
648 int (*compare)(struct meta_obj *, struct meta_obj *);
649 int (*change)(struct meta_value *, struct rtattr *);
650 void (*apply_extras)(struct meta_value *, struct meta_obj *);
651 int (*dump)(struct sk_buff *, struct meta_value *, int);
652};
653
654static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
655 [TCF_META_TYPE_VAR] = {
656 .destroy = meta_var_destroy,
657 .compare = meta_var_compare,
658 .change = meta_var_change,
659 .apply_extras = meta_var_apply_extras,
660 .dump = meta_var_dump
661 },
662 [TCF_META_TYPE_INT] = {
663 .compare = meta_int_compare,
664 .change = meta_int_change,
665 .apply_extras = meta_int_apply_extras,
666 .dump = meta_int_dump
667 }
668};
669
670static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
671{
672 return &__meta_type_ops[meta_type(v)];
673}
674
675/**************************************************************************
676 * Core
677 **************************************************************************/
678
679static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
680 struct meta_value *v, struct meta_obj *dst)
681{
682 int err = 0;
683
684 if (meta_id(v) == TCF_META_ID_VALUE) {
685 dst->value = v->val;
686 dst->len = v->len;
687 return 0;
688 }
689
690 meta_ops(v)->get(skb, info, v, dst, &err);
691 if (err < 0)
692 return err;
693
694 if (meta_type_ops(v)->apply_extras)
695 meta_type_ops(v)->apply_extras(v, dst);
696
697 return 0;
698}
699
700static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
701 struct tcf_pkt_info *info)
702{
703 int r;
704 struct meta_match *meta = (struct meta_match *) m->data;
705 struct meta_obj l_value, r_value;
706
707 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
708 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
709 return 0;
710
711 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
712
713 switch (meta->lvalue.hdr.op) {
714 case TCF_EM_OPND_EQ:
715 return !r;
716 case TCF_EM_OPND_LT:
717 return r < 0;
718 case TCF_EM_OPND_GT:
719 return r > 0;
720 }
721
722 return 0;
723}
724
725static inline void meta_delete(struct meta_match *meta)
726{
727 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
728
729 if (ops && ops->destroy) {
730 ops->destroy(&meta->lvalue);
731 ops->destroy(&meta->rvalue);
732 }
733
734 kfree(meta);
735}
736
737static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
738{
739 if (rta) {
740 if (RTA_PAYLOAD(rta) == 0)
741 return -EINVAL;
742
743 return meta_type_ops(dst)->change(dst, rta);
744 }
745
746 return 0;
747}
748
749static inline int meta_is_supported(struct meta_value *val)
750{
751 return (!meta_id(val) || meta_ops(val)->get);
752}
753
754static int em_meta_change(struct tcf_proto *tp, void *data, int len,
755 struct tcf_ematch *m)
756{
757 int err = -EINVAL;
758 struct rtattr *tb[TCA_EM_META_MAX];
759 struct tcf_meta_hdr *hdr;
760 struct meta_match *meta = NULL;
761
762 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
763 goto errout;
764
765 if (tb[TCA_EM_META_HDR-1] == NULL ||
766 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
767 goto errout;
768 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
769
770 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
771 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
772 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
773 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
774 goto errout;
775
0da974f4 776 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 777 if (meta == NULL)
778 goto errout;
1da177e4
LT		 779
780 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
781 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
782
783 if (!meta_is_supported(&meta->lvalue) ||
784 !meta_is_supported(&meta->rvalue)) {
785 err = -EOPNOTSUPP;
786 goto errout;
787 }
788
789 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
790 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
791 goto errout;
792
793 m->datalen = sizeof(*meta);
794 m->data = (unsigned long) meta;
795
796 err = 0;
797errout:
798 if (err && meta)
799 meta_delete(meta);
800 return err;
801}
802
803static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
804{
805 if (m)
806 meta_delete((struct meta_match *) m->data);
807}
808
809static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
810{
811 struct meta_match *meta = (struct meta_match *) em->data;
812 struct tcf_meta_hdr hdr;
813 struct meta_type_ops *ops;
814
815 memset(&hdr, 0, sizeof(hdr));
816 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
817 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
818
819 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
820
821 ops = meta_type_ops(&meta->lvalue);
822 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
823 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
824 goto rtattr_failure;
825
826 return 0;
827
828rtattr_failure:
829 return -1;
830}
831
832static struct tcf_ematch_ops em_meta_ops = {
833 .kind = TCF_EM_META,
834 .change = em_meta_change,
835 .match = em_meta_match,
836 .destroy = em_meta_destroy,
837 .dump = em_meta_dump,
838 .owner = THIS_MODULE,
839 .link = LIST_HEAD_INIT(em_meta_ops.link)
840};
841
842static int __init init_em_meta(void)
843{
844 return tcf_em_register(&em_meta_ops);
845}
846
847static void __exit exit_em_meta(void)
848{
849 tcf_em_unregister(&em_meta_ops);
850}
851
852MODULE_LICENSE("GPL");
853
854module_init(init_em_meta);
855module_exit(exit_em_meta);
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