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NOMMU: Fix __get_user_pages() to pin last page on offset buffers
[nv-tegra-linux-2.6.git] / net / sched / em_meta.c
blob24dce8b648a425b39f877bfe4935b0602ee16c9b
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 * ==========================================================================
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 |
30 * def | id: DEV | | id: VALUE |
31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
34 * ---> meta_ops[INT][DEV](...) |
35 * | |
36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
40 * obj | id: DEV | | id: VALUE |
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 subsystem is enabled in the kernel.
59 */
60
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/if_vlan.h>
69 #include <linux/tc_ematch/tc_em_meta.h>
70 #include <net/dst.h>
71 #include <net/route.h>
72 #include <net/pkt_cls.h>
73 #include <net/sock.h>
74
75 struct meta_obj
76 {
77 unsigned long value;
78 unsigned int len;
79 };
80
81 struct meta_value
82 {
83 struct tcf_meta_val hdr;
84 unsigned long val;
85 unsigned int len;
86 };
87
88 struct meta_match
89 {
90 struct meta_value lvalue;
91 struct meta_value rvalue;
92 };
93
94 static inline int meta_id(struct meta_value *v)
95 {
96 return TCF_META_ID(v->hdr.kind);
97 }
98
99 static inline int meta_type(struct meta_value *v)
100 {
101 return TCF_META_TYPE(v->hdr.kind);
102 }
103
104 #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
105 struct tcf_pkt_info *info, struct meta_value *v, \
106 struct meta_obj *dst, int *err)
107
108 /**************************************************************************
109 * System status & misc
110 **************************************************************************/
111
112 META_COLLECTOR(int_random)
113 {
114 get_random_bytes(&dst->value, sizeof(dst->value));
115 }
116
117 static inline unsigned long fixed_loadavg(int load)
118 {
119 int rnd_load = load + (FIXED_1/200);
120 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
121
122 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
123 }
124
125 META_COLLECTOR(int_loadavg_0)
126 {
127 dst->value = fixed_loadavg(avenrun[0]);
128 }
129
130 META_COLLECTOR(int_loadavg_1)
131 {
132 dst->value = fixed_loadavg(avenrun[1]);
133 }
134
135 META_COLLECTOR(int_loadavg_2)
136 {
137 dst->value = fixed_loadavg(avenrun[2]);
138 }
139
140 /**************************************************************************
141 * Device names & indices
142 **************************************************************************/
143
144 static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
145 {
146 if (unlikely(dev == NULL))
147 return -1;
148
149 dst->value = dev->ifindex;
150 return 0;
151 }
152
153 static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
154 {
155 if (unlikely(dev == NULL))
156 return -1;
157
158 dst->value = (unsigned long) dev->name;
159 dst->len = strlen(dev->name);
160 return 0;
161 }
162
163 META_COLLECTOR(int_dev)
164 {
165 *err = int_dev(skb->dev, dst);
166 }
167
168 META_COLLECTOR(var_dev)
169 {
170 *err = var_dev(skb->dev, dst);
171 }
172
173 /**************************************************************************
174 * vlan tag
175 **************************************************************************/
176
177 META_COLLECTOR(int_vlan_tag)
178 {
179 unsigned short tag;
180
181 tag = vlan_tx_tag_get(skb);
182 if (!tag && __vlan_get_tag(skb, &tag))
183 *err = -1;
184 else
185 dst->value = tag;
186 }
187
188
189
190 /**************************************************************************
191 * skb attributes
192 **************************************************************************/
193
194 META_COLLECTOR(int_priority)
195 {
196 dst->value = skb->priority;
197 }
198
199 META_COLLECTOR(int_protocol)
200 {
201 /* Let userspace take care of the byte ordering */
202 dst->value = skb->protocol;
203 }
204
205 META_COLLECTOR(int_pkttype)
206 {
207 dst->value = skb->pkt_type;
208 }
209
210 META_COLLECTOR(int_pktlen)
211 {
212 dst->value = skb->len;
213 }
214
215 META_COLLECTOR(int_datalen)
216 {
217 dst->value = skb->data_len;
218 }
219
220 META_COLLECTOR(int_maclen)
221 {
222 dst->value = skb->mac_len;
223 }
224
225 /**************************************************************************
226 * Netfilter
227 **************************************************************************/
228
229 META_COLLECTOR(int_mark)
230 {
231 dst->value = skb->mark;
232 }
233
234 /**************************************************************************
235 * Traffic Control
236 **************************************************************************/
237
238 META_COLLECTOR(int_tcindex)
239 {
240 dst->value = skb->tc_index;
241 }
242
243 /**************************************************************************
244 * Routing
245 **************************************************************************/
246
247 META_COLLECTOR(int_rtclassid)
248 {
249 if (unlikely(skb_dst(skb) == NULL))
250 *err = -1;
251 else
252 #ifdef CONFIG_NET_CLS_ROUTE
253 dst->value = skb_dst(skb)->tclassid;
254 #else
255 dst->value = 0;
256 #endif
257 }
258
259 META_COLLECTOR(int_rtiif)
260 {
261 if (unlikely(skb_rtable(skb) == NULL))
262 *err = -1;
263 else
264 dst->value = skb_rtable(skb)->fl.iif;
265 }
266
267 /**************************************************************************
268 * Socket Attributes
269 **************************************************************************/
270
271 #define SKIP_NONLOCAL(skb) \
272 if (unlikely(skb->sk == NULL)) { \
273 *err = -1; \
274 return; \
275 }
276
277 META_COLLECTOR(int_sk_family)
278 {
279 SKIP_NONLOCAL(skb);
280 dst->value = skb->sk->sk_family;
281 }
282
283 META_COLLECTOR(int_sk_state)
284 {
285 SKIP_NONLOCAL(skb);
286 dst->value = skb->sk->sk_state;
287 }
288
289 META_COLLECTOR(int_sk_reuse)
290 {
291 SKIP_NONLOCAL(skb);
292 dst->value = skb->sk->sk_reuse;
293 }
294
295 META_COLLECTOR(int_sk_bound_if)
296 {
297 SKIP_NONLOCAL(skb);
298 /* No error if bound_dev_if is 0, legal userspace check */
299 dst->value = skb->sk->sk_bound_dev_if;
300 }
301
302 META_COLLECTOR(var_sk_bound_if)
303 {
304 SKIP_NONLOCAL(skb);
305
306 if (skb->sk->sk_bound_dev_if == 0) {
307 dst->value = (unsigned long) "any";
308 dst->len = 3;
309 } else {
310 struct net_device *dev;
311
312 rcu_read_lock();
313 dev = dev_get_by_index_rcu(sock_net(skb->sk),
314 skb->sk->sk_bound_dev_if);
315 *err = var_dev(dev, dst);
316 rcu_read_unlock();
317 }
318 }
319
320 META_COLLECTOR(int_sk_refcnt)
321 {
322 SKIP_NONLOCAL(skb);
323 dst->value = atomic_read(&skb->sk->sk_refcnt);
324 }
325
326 META_COLLECTOR(int_sk_rcvbuf)
327 {
328 SKIP_NONLOCAL(skb);
329 dst->value = skb->sk->sk_rcvbuf;
330 }
331
332 META_COLLECTOR(int_sk_shutdown)
333 {
334 SKIP_NONLOCAL(skb);
335 dst->value = skb->sk->sk_shutdown;
336 }
337
338 META_COLLECTOR(int_sk_proto)
339 {
340 SKIP_NONLOCAL(skb);
341 dst->value = skb->sk->sk_protocol;
342 }
343
344 META_COLLECTOR(int_sk_type)
345 {
346 SKIP_NONLOCAL(skb);
347 dst->value = skb->sk->sk_type;
348 }
349
350 META_COLLECTOR(int_sk_rmem_alloc)
351 {
352 SKIP_NONLOCAL(skb);
353 dst->value = sk_rmem_alloc_get(skb->sk);
354 }
355
356 META_COLLECTOR(int_sk_wmem_alloc)
357 {
358 SKIP_NONLOCAL(skb);
359 dst->value = sk_wmem_alloc_get(skb->sk);
360 }
361
362 META_COLLECTOR(int_sk_omem_alloc)
363 {
364 SKIP_NONLOCAL(skb);
365 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
366 }
367
368 META_COLLECTOR(int_sk_rcv_qlen)
369 {
370 SKIP_NONLOCAL(skb);
371 dst->value = skb->sk->sk_receive_queue.qlen;
372 }
373
374 META_COLLECTOR(int_sk_snd_qlen)
375 {
376 SKIP_NONLOCAL(skb);
377 dst->value = skb->sk->sk_write_queue.qlen;
378 }
379
380 META_COLLECTOR(int_sk_wmem_queued)
381 {
382 SKIP_NONLOCAL(skb);
383 dst->value = skb->sk->sk_wmem_queued;
384 }
385
386 META_COLLECTOR(int_sk_fwd_alloc)
387 {
388 SKIP_NONLOCAL(skb);
389 dst->value = skb->sk->sk_forward_alloc;
390 }
391
392 META_COLLECTOR(int_sk_sndbuf)
393 {
394 SKIP_NONLOCAL(skb);
395 dst->value = skb->sk->sk_sndbuf;
396 }
397
398 META_COLLECTOR(int_sk_alloc)
399 {
400 SKIP_NONLOCAL(skb);
401 dst->value = skb->sk->sk_allocation;
402 }
403
404 META_COLLECTOR(int_sk_route_caps)
405 {
406 SKIP_NONLOCAL(skb);
407 dst->value = skb->sk->sk_route_caps;
408 }
409
410 META_COLLECTOR(int_sk_hash)
411 {
412 SKIP_NONLOCAL(skb);
413 dst->value = skb->sk->sk_hash;
414 }
415
416 META_COLLECTOR(int_sk_lingertime)
417 {
418 SKIP_NONLOCAL(skb);
419 dst->value = skb->sk->sk_lingertime / HZ;
420 }
421
422 META_COLLECTOR(int_sk_err_qlen)
423 {
424 SKIP_NONLOCAL(skb);
425 dst->value = skb->sk->sk_error_queue.qlen;
426 }
427
428 META_COLLECTOR(int_sk_ack_bl)
429 {
430 SKIP_NONLOCAL(skb);
431 dst->value = skb->sk->sk_ack_backlog;
432 }
433
434 META_COLLECTOR(int_sk_max_ack_bl)
435 {
436 SKIP_NONLOCAL(skb);
437 dst->value = skb->sk->sk_max_ack_backlog;
438 }
439
440 META_COLLECTOR(int_sk_prio)
441 {
442 SKIP_NONLOCAL(skb);
443 dst->value = skb->sk->sk_priority;
444 }
445
446 META_COLLECTOR(int_sk_rcvlowat)
447 {
448 SKIP_NONLOCAL(skb);
449 dst->value = skb->sk->sk_rcvlowat;
450 }
451
452 META_COLLECTOR(int_sk_rcvtimeo)
453 {
454 SKIP_NONLOCAL(skb);
455 dst->value = skb->sk->sk_rcvtimeo / HZ;
456 }
457
458 META_COLLECTOR(int_sk_sndtimeo)
459 {
460 SKIP_NONLOCAL(skb);
461 dst->value = skb->sk->sk_sndtimeo / HZ;
462 }
463
464 META_COLLECTOR(int_sk_sendmsg_off)
465 {
466 SKIP_NONLOCAL(skb);
467 dst->value = skb->sk->sk_sndmsg_off;
468 }
469
470 META_COLLECTOR(int_sk_write_pend)
471 {
472 SKIP_NONLOCAL(skb);
473 dst->value = skb->sk->sk_write_pending;
474 }
475
476 /**************************************************************************
477 * Meta value collectors assignment table
478 **************************************************************************/
479
480 struct meta_ops
481 {
482 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
483 struct meta_value *, struct meta_obj *, int *);
484 };
485
486 #define META_ID(name) TCF_META_ID_##name
487 #define META_FUNC(name) { .get = meta_##name }
488
489 /* Meta value operations table listing all meta value collectors and
490 * assigns them to a type and meta id. */
491 static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
492 [TCF_META_TYPE_VAR] = {
493 [META_ID(DEV)] = META_FUNC(var_dev),
494 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
495 },
496 [TCF_META_TYPE_INT] = {
497 [META_ID(RANDOM)] = META_FUNC(int_random),
498 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
499 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
500 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
501 [META_ID(DEV)] = META_FUNC(int_dev),
502 [META_ID(PRIORITY)] = META_FUNC(int_priority),
503 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
504 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
505 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
506 [META_ID(DATALEN)] = META_FUNC(int_datalen),
507 [META_ID(MACLEN)] = META_FUNC(int_maclen),
508 [META_ID(NFMARK)] = META_FUNC(int_mark),
509 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
510 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
511 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
512 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
513 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
514 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
515 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
516 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
517 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
518 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
519 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
520 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
521 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
522 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
523 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
524 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
525 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
526 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
527 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
528 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
529 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
530 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
531 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
532 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
533 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
534 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
535 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
536 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
537 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
538 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
539 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
540 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
541 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
542 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
543 }
544 };
545
546 static inline struct meta_ops * meta_ops(struct meta_value *val)
547 {
548 return &__meta_ops[meta_type(val)][meta_id(val)];
549 }
550
551 /**************************************************************************
552 * Type specific operations for TCF_META_TYPE_VAR
553 **************************************************************************/
554
555 static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
556 {
557 int r = a->len - b->len;
558
559 if (r == 0)
560 r = memcmp((void *) a->value, (void *) b->value, a->len);
561
562 return r;
563 }
564
565 static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
566 {
567 int len = nla_len(nla);
568
569 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
570 if (dst->val == 0UL)
571 return -ENOMEM;
572 dst->len = len;
573 return 0;
574 }
575
576 static void meta_var_destroy(struct meta_value *v)
577 {
578 kfree((void *) v->val);
579 }
580
581 static void meta_var_apply_extras(struct meta_value *v,
582 struct meta_obj *dst)
583 {
584 int shift = v->hdr.shift;
585
586 if (shift && shift < dst->len)
587 dst->len -= shift;
588 }
589
590 static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
591 {
592 if (v->val && v->len)
593 NLA_PUT(skb, tlv, v->len, (void *) v->val);
594 return 0;
595
596 nla_put_failure:
597 return -1;
598 }
599
600 /**************************************************************************
601 * Type specific operations for TCF_META_TYPE_INT
602 **************************************************************************/
603
604 static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
605 {
606 /* Let gcc optimize it, the unlikely is not really based on
607 * some numbers but jump free code for mismatches seems
608 * more logical. */
609 if (unlikely(a->value == b->value))
610 return 0;
611 else if (a->value < b->value)
612 return -1;
613 else
614 return 1;
615 }
616
617 static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
618 {
619 if (nla_len(nla) >= sizeof(unsigned long)) {
620 dst->val = *(unsigned long *) nla_data(nla);
621 dst->len = sizeof(unsigned long);
622 } else if (nla_len(nla) == sizeof(u32)) {
623 dst->val = nla_get_u32(nla);
624 dst->len = sizeof(u32);
625 } else
626 return -EINVAL;
627
628 return 0;
629 }
630
631 static void meta_int_apply_extras(struct meta_value *v,
632 struct meta_obj *dst)
633 {
634 if (v->hdr.shift)
635 dst->value >>= v->hdr.shift;
636
637 if (v->val)
638 dst->value &= v->val;
639 }
640
641 static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
642 {
643 if (v->len == sizeof(unsigned long))
644 NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
645 else if (v->len == sizeof(u32)) {
646 NLA_PUT_U32(skb, tlv, v->val);
647 }
648
649 return 0;
650
651 nla_put_failure:
652 return -1;
653 }
654
655 /**************************************************************************
656 * Type specific operations table
657 **************************************************************************/
658
659 struct meta_type_ops
660 {
661 void (*destroy)(struct meta_value *);
662 int (*compare)(struct meta_obj *, struct meta_obj *);
663 int (*change)(struct meta_value *, struct nlattr *);
664 void (*apply_extras)(struct meta_value *, struct meta_obj *);
665 int (*dump)(struct sk_buff *, struct meta_value *, int);
666 };
667
668 static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
669 [TCF_META_TYPE_VAR] = {
670 .destroy = meta_var_destroy,
671 .compare = meta_var_compare,
672 .change = meta_var_change,
673 .apply_extras = meta_var_apply_extras,
674 .dump = meta_var_dump
675 },
676 [TCF_META_TYPE_INT] = {
677 .compare = meta_int_compare,
678 .change = meta_int_change,
679 .apply_extras = meta_int_apply_extras,
680 .dump = meta_int_dump
681 }
682 };
683
684 static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
685 {
686 return &__meta_type_ops[meta_type(v)];
687 }
688
689 /**************************************************************************
690 * Core
691 **************************************************************************/
692
693 static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
694 struct meta_value *v, struct meta_obj *dst)
695 {
696 int err = 0;
697
698 if (meta_id(v) == TCF_META_ID_VALUE) {
699 dst->value = v->val;
700 dst->len = v->len;
701 return 0;
702 }
703
704 meta_ops(v)->get(skb, info, v, dst, &err);
705 if (err < 0)
706 return err;
707
708 if (meta_type_ops(v)->apply_extras)
709 meta_type_ops(v)->apply_extras(v, dst);
710
711 return 0;
712 }
713
714 static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
715 struct tcf_pkt_info *info)
716 {
717 int r;
718 struct meta_match *meta = (struct meta_match *) m->data;
719 struct meta_obj l_value, r_value;
720
721 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
722 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
723 return 0;
724
725 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
726
727 switch (meta->lvalue.hdr.op) {
728 case TCF_EM_OPND_EQ:
729 return !r;
730 case TCF_EM_OPND_LT:
731 return r < 0;
732 case TCF_EM_OPND_GT:
733 return r > 0;
734 }
735
736 return 0;
737 }
738
739 static void meta_delete(struct meta_match *meta)
740 {
741 if (meta) {
742 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
743
744 if (ops && ops->destroy) {
745 ops->destroy(&meta->lvalue);
746 ops->destroy(&meta->rvalue);
747 }
748 }
749
750 kfree(meta);
751 }
752
753 static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
754 {
755 if (nla) {
756 if (nla_len(nla) == 0)
757 return -EINVAL;
758
759 return meta_type_ops(dst)->change(dst, nla);
760 }
761
762 return 0;
763 }
764
765 static inline int meta_is_supported(struct meta_value *val)
766 {
767 return (!meta_id(val) || meta_ops(val)->get);
768 }
769
770 static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
771 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
772 };
773
774 static int em_meta_change(struct tcf_proto *tp, void *data, int len,
775 struct tcf_ematch *m)
776 {
777 int err;
778 struct nlattr *tb[TCA_EM_META_MAX + 1];
779 struct tcf_meta_hdr *hdr;
780 struct meta_match *meta = NULL;
781
782 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
783 if (err < 0)
784 goto errout;
785
786 err = -EINVAL;
787 if (tb[TCA_EM_META_HDR] == NULL)
788 goto errout;
789 hdr = nla_data(tb[TCA_EM_META_HDR]);
790
791 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
792 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
793 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
794 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
795 goto errout;
796
797 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
798 if (meta == NULL)
799 goto errout;
800
801 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
802 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
803
804 if (!meta_is_supported(&meta->lvalue) ||
805 !meta_is_supported(&meta->rvalue)) {
806 err = -EOPNOTSUPP;
807 goto errout;
808 }
809
810 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
811 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
812 goto errout;
813
814 m->datalen = sizeof(*meta);
815 m->data = (unsigned long) meta;
816
817 err = 0;
818 errout:
819 if (err && meta)
820 meta_delete(meta);
821 return err;
822 }
823
824 static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
825 {
826 if (m)
827 meta_delete((struct meta_match *) m->data);
828 }
829
830 static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
831 {
832 struct meta_match *meta = (struct meta_match *) em->data;
833 struct tcf_meta_hdr hdr;
834 struct meta_type_ops *ops;
835
836 memset(&hdr, 0, sizeof(hdr));
837 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
838 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
839
840 NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
841
842 ops = meta_type_ops(&meta->lvalue);
843 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
844 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
845 goto nla_put_failure;
846
847 return 0;
848
849 nla_put_failure:
850 return -1;
851 }
852
853 static struct tcf_ematch_ops em_meta_ops = {
854 .kind = TCF_EM_META,
855 .change = em_meta_change,
856 .match = em_meta_match,
857 .destroy = em_meta_destroy,
858 .dump = em_meta_dump,
859 .owner = THIS_MODULE,
860 .link = LIST_HEAD_INIT(em_meta_ops.link)
861 };
862
863 static int __init init_em_meta(void)
864 {
865 return tcf_em_register(&em_meta_ops);
866 }
867
868 static void __exit exit_em_meta(void)
869 {
870 tcf_em_unregister(&em_meta_ops);
871 }
872
873 MODULE_LICENSE("GPL");
874
875 module_init(init_em_meta);
876 module_exit(exit_em_meta);
877
878 MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
Mirror of NV Tegra kernel