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[PATCH] w1: fix CRC calculation on bigendian platforms.
[linux-2.6/verdex.git] / net / sched / em_meta.c
blob53d98f8d3d8091b2243a2cbb6b23515f18911622
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: INDEV | | id: VALUE |
31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
34 * ---> meta_ops[INT][INDEV](...) |
35 * | |
36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
40 * obj | id: INDEV | | 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 subsytem is enabled in the kernel.
59 */
60
61 #include <linux/config.h>
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>
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 META_COLLECTOR(int_indev)
174 {
175 *err = int_dev(skb->input_dev, dst);
176 }
177
178 META_COLLECTOR(var_indev)
179 {
180 *err = var_dev(skb->input_dev, dst);
181 }
182
183 META_COLLECTOR(int_realdev)
184 {
185 *err = int_dev(skb->real_dev, dst);
186 }
187
188 META_COLLECTOR(var_realdev)
189 {
190 *err = var_dev(skb->real_dev, dst);
191 }
192
193 /**************************************************************************
194 * skb attributes
195 **************************************************************************/
196
197 META_COLLECTOR(int_priority)
198 {
199 dst->value = skb->priority;
200 }
201
202 META_COLLECTOR(int_protocol)
203 {
204 /* Let userspace take care of the byte ordering */
205 dst->value = skb->protocol;
206 }
207
208 META_COLLECTOR(int_pkttype)
209 {
210 dst->value = skb->pkt_type;
211 }
212
213 META_COLLECTOR(int_pktlen)
214 {
215 dst->value = skb->len;
216 }
217
218 META_COLLECTOR(int_datalen)
219 {
220 dst->value = skb->data_len;
221 }
222
223 META_COLLECTOR(int_maclen)
224 {
225 dst->value = skb->mac_len;
226 }
227
228 /**************************************************************************
229 * Netfilter
230 **************************************************************************/
231
232 #ifdef CONFIG_NETFILTER
233 META_COLLECTOR(int_nfmark)
234 {
235 dst->value = skb->nfmark;
236 }
237 #endif
238
239 /**************************************************************************
240 * Traffic Control
241 **************************************************************************/
242
243 META_COLLECTOR(int_tcindex)
244 {
245 dst->value = skb->tc_index;
246 }
247
248 #ifdef CONFIG_NET_CLS_ACT
249 META_COLLECTOR(int_tcverd)
250 {
251 dst->value = skb->tc_verd;
252 }
253
254 META_COLLECTOR(int_tcclassid)
255 {
256 dst->value = skb->tc_classid;
257 }
258 #endif
259
260 /**************************************************************************
261 * Routing
262 **************************************************************************/
263
264 #ifdef CONFIG_NET_CLS_ROUTE
265 META_COLLECTOR(int_rtclassid)
266 {
267 if (unlikely(skb->dst == NULL))
268 *err = -1;
269 else
270 dst->value = skb->dst->tclassid;
271 }
272 #endif
273
274 META_COLLECTOR(int_rtiif)
275 {
276 if (unlikely(skb->dst == NULL))
277 *err = -1;
278 else
279 dst->value = ((struct rtable*) skb->dst)->fl.iif;
280 }
281
282 /**************************************************************************
283 * Socket Attributes
284 **************************************************************************/
285
286 #define SKIP_NONLOCAL(skb) \
287 if (unlikely(skb->sk == NULL)) { \
288 *err = -1; \
289 return; \
290 }
291
292 META_COLLECTOR(int_sk_family)
293 {
294 SKIP_NONLOCAL(skb);
295 dst->value = skb->sk->sk_family;
296 }
297
298 META_COLLECTOR(int_sk_state)
299 {
300 SKIP_NONLOCAL(skb);
301 dst->value = skb->sk->sk_state;
302 }
303
304 META_COLLECTOR(int_sk_reuse)
305 {
306 SKIP_NONLOCAL(skb);
307 dst->value = skb->sk->sk_reuse;
308 }
309
310 META_COLLECTOR(int_sk_bound_if)
311 {
312 SKIP_NONLOCAL(skb);
313 /* No error if bound_dev_if is 0, legal userspace check */
314 dst->value = skb->sk->sk_bound_dev_if;
315 }
316
317 META_COLLECTOR(var_sk_bound_if)
318 {
319 SKIP_NONLOCAL(skb);
320
321 if (skb->sk->sk_bound_dev_if == 0) {
322 dst->value = (unsigned long) "any";
323 dst->len = 3;
324 } else {
325 struct net_device *dev;
326
327 dev = dev_get_by_index(skb->sk->sk_bound_dev_if);
328 *err = var_dev(dev, dst);
329 if (dev)
330 dev_put(dev);
331 }
332 }
333
334 META_COLLECTOR(int_sk_refcnt)
335 {
336 SKIP_NONLOCAL(skb);
337 dst->value = atomic_read(&skb->sk->sk_refcnt);
338 }
339
340 META_COLLECTOR(int_sk_rcvbuf)
341 {
342 SKIP_NONLOCAL(skb);
343 dst->value = skb->sk->sk_rcvbuf;
344 }
345
346 META_COLLECTOR(int_sk_shutdown)
347 {
348 SKIP_NONLOCAL(skb);
349 dst->value = skb->sk->sk_shutdown;
350 }
351
352 META_COLLECTOR(int_sk_proto)
353 {
354 SKIP_NONLOCAL(skb);
355 dst->value = skb->sk->sk_protocol;
356 }
357
358 META_COLLECTOR(int_sk_type)
359 {
360 SKIP_NONLOCAL(skb);
361 dst->value = skb->sk->sk_type;
362 }
363
364 META_COLLECTOR(int_sk_rmem_alloc)
365 {
366 SKIP_NONLOCAL(skb);
367 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
368 }
369
370 META_COLLECTOR(int_sk_wmem_alloc)
371 {
372 SKIP_NONLOCAL(skb);
373 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
374 }
375
376 META_COLLECTOR(int_sk_omem_alloc)
377 {
378 SKIP_NONLOCAL(skb);
379 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
380 }
381
382 META_COLLECTOR(int_sk_rcv_qlen)
383 {
384 SKIP_NONLOCAL(skb);
385 dst->value = skb->sk->sk_receive_queue.qlen;
386 }
387
388 META_COLLECTOR(int_sk_snd_qlen)
389 {
390 SKIP_NONLOCAL(skb);
391 dst->value = skb->sk->sk_write_queue.qlen;
392 }
393
394 META_COLLECTOR(int_sk_wmem_queued)
395 {
396 SKIP_NONLOCAL(skb);
397 dst->value = skb->sk->sk_wmem_queued;
398 }
399
400 META_COLLECTOR(int_sk_fwd_alloc)
401 {
402 SKIP_NONLOCAL(skb);
403 dst->value = skb->sk->sk_forward_alloc;
404 }
405
406 META_COLLECTOR(int_sk_sndbuf)
407 {
408 SKIP_NONLOCAL(skb);
409 dst->value = skb->sk->sk_sndbuf;
410 }
411
412 META_COLLECTOR(int_sk_alloc)
413 {
414 SKIP_NONLOCAL(skb);
415 dst->value = skb->sk->sk_allocation;
416 }
417
418 META_COLLECTOR(int_sk_route_caps)
419 {
420 SKIP_NONLOCAL(skb);
421 dst->value = skb->sk->sk_route_caps;
422 }
423
424 META_COLLECTOR(int_sk_hashent)
425 {
426 SKIP_NONLOCAL(skb);
427 dst->value = skb->sk->sk_hashent;
428 }
429
430 META_COLLECTOR(int_sk_lingertime)
431 {
432 SKIP_NONLOCAL(skb);
433 dst->value = skb->sk->sk_lingertime / HZ;
434 }
435
436 META_COLLECTOR(int_sk_err_qlen)
437 {
438 SKIP_NONLOCAL(skb);
439 dst->value = skb->sk->sk_error_queue.qlen;
440 }
441
442 META_COLLECTOR(int_sk_ack_bl)
443 {
444 SKIP_NONLOCAL(skb);
445 dst->value = skb->sk->sk_ack_backlog;
446 }
447
448 META_COLLECTOR(int_sk_max_ack_bl)
449 {
450 SKIP_NONLOCAL(skb);
451 dst->value = skb->sk->sk_max_ack_backlog;
452 }
453
454 META_COLLECTOR(int_sk_prio)
455 {
456 SKIP_NONLOCAL(skb);
457 dst->value = skb->sk->sk_priority;
458 }
459
460 META_COLLECTOR(int_sk_rcvlowat)
461 {
462 SKIP_NONLOCAL(skb);
463 dst->value = skb->sk->sk_rcvlowat;
464 }
465
466 META_COLLECTOR(int_sk_rcvtimeo)
467 {
468 SKIP_NONLOCAL(skb);
469 dst->value = skb->sk->sk_rcvtimeo / HZ;
470 }
471
472 META_COLLECTOR(int_sk_sndtimeo)
473 {
474 SKIP_NONLOCAL(skb);
475 dst->value = skb->sk->sk_sndtimeo / HZ;
476 }
477
478 META_COLLECTOR(int_sk_sendmsg_off)
479 {
480 SKIP_NONLOCAL(skb);
481 dst->value = skb->sk->sk_sndmsg_off;
482 }
483
484 META_COLLECTOR(int_sk_write_pend)
485 {
486 SKIP_NONLOCAL(skb);
487 dst->value = skb->sk->sk_write_pending;
488 }
489
490 /**************************************************************************
491 * Meta value collectors assignment table
492 **************************************************************************/
493
494 struct meta_ops
495 {
496 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
497 struct meta_value *, struct meta_obj *, int *);
498 };
499
500 #define META_ID(name) TCF_META_ID_##name
501 #define META_FUNC(name) { .get = meta_##name }
502
503 /* Meta value operations table listing all meta value collectors and
504 * assigns them to a type and meta id. */
505 static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
506 [TCF_META_TYPE_VAR] = {
507 [META_ID(DEV)] = META_FUNC(var_dev),
508 [META_ID(INDEV)] = META_FUNC(var_indev),
509 [META_ID(REALDEV)] = META_FUNC(var_realdev),
510 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
511 },
512 [TCF_META_TYPE_INT] = {
513 [META_ID(RANDOM)] = META_FUNC(int_random),
514 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
515 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
516 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
517 [META_ID(DEV)] = META_FUNC(int_dev),
518 [META_ID(INDEV)] = META_FUNC(int_indev),
519 [META_ID(REALDEV)] = META_FUNC(int_realdev),
520 [META_ID(PRIORITY)] = META_FUNC(int_priority),
521 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
522 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
523 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
524 [META_ID(DATALEN)] = META_FUNC(int_datalen),
525 [META_ID(MACLEN)] = META_FUNC(int_maclen),
526 #ifdef CONFIG_NETFILTER
527 [META_ID(NFMARK)] = META_FUNC(int_nfmark),
528 #endif
529 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
530 #ifdef CONFIG_NET_CLS_ACT
531 [META_ID(TCVERDICT)] = META_FUNC(int_tcverd),
532 [META_ID(TCCLASSID)] = META_FUNC(int_tcclassid),
533 #endif
534 #ifdef CONFIG_NET_CLS_ROUTE
535 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
536 #endif
537 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
538 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
539 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
540 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
541 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
542 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
543 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
544 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
545 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
546 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
547 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
548 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
549 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
550 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
551 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
552 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
553 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
554 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
555 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
556 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
557 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
558 [META_ID(SK_HASHENT)] = META_FUNC(int_sk_hashent),
559 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
560 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
561 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
562 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
563 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
564 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
565 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
566 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
567 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
568 }
569 };
570
571 static inline struct meta_ops * meta_ops(struct meta_value *val)
572 {
573 return &__meta_ops[meta_type(val)][meta_id(val)];
574 }
575
576 /**************************************************************************
577 * Type specific operations for TCF_META_TYPE_VAR
578 **************************************************************************/
579
580 static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
581 {
582 int r = a->len - b->len;
583
584 if (r == 0)
585 r = memcmp((void *) a->value, (void *) b->value, a->len);
586
587 return r;
588 }
589
590 static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
591 {
592 int len = RTA_PAYLOAD(rta);
593
594 dst->val = (unsigned long) kmalloc(len, GFP_KERNEL);
595 if (dst->val == 0UL)
596 return -ENOMEM;
597 memcpy((void *) dst->val, RTA_DATA(rta), len);
598 dst->len = len;
599 return 0;
600 }
601
602 static void meta_var_destroy(struct meta_value *v)
603 {
604 if (v->val)
605 kfree((void *) v->val);
606 }
607
608 static void meta_var_apply_extras(struct meta_value *v,
609 struct meta_obj *dst)
610 {
611 int shift = v->hdr.shift;
612
613 if (shift && shift < dst->len)
614 dst->len -= shift;
615 }
616
617 static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
618 {
619 if (v->val && v->len)
620 RTA_PUT(skb, tlv, v->len, (void *) v->val);
621 return 0;
622
623 rtattr_failure:
624 return -1;
625 }
626
627 /**************************************************************************
628 * Type specific operations for TCF_META_TYPE_INT
629 **************************************************************************/
630
631 static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
632 {
633 /* Let gcc optimize it, the unlikely is not really based on
634 * some numbers but jump free code for mismatches seems
635 * more logical. */
636 if (unlikely(a->value == b->value))
637 return 0;
638 else if (a->value < b->value)
639 return -1;
640 else
641 return 1;
642 }
643
644 static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
645 {
646 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
647 dst->val = *(unsigned long *) RTA_DATA(rta);
648 dst->len = sizeof(unsigned long);
649 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
650 dst->val = *(u32 *) RTA_DATA(rta);
651 dst->len = sizeof(u32);
652 } else
653 return -EINVAL;
654
655 return 0;
656 }
657
658 static void meta_int_apply_extras(struct meta_value *v,
659 struct meta_obj *dst)
660 {
661 if (v->hdr.shift)
662 dst->value >>= v->hdr.shift;
663
664 if (v->val)
665 dst->value &= v->val;
666 }
667
668 static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
669 {
670 if (v->len == sizeof(unsigned long))
671 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
672 else if (v->len == sizeof(u32)) {
673 u32 d = v->val;
674 RTA_PUT(skb, tlv, sizeof(d), &d);
675 }
676
677 return 0;
678
679 rtattr_failure:
680 return -1;
681 }
682
683 /**************************************************************************
684 * Type specific operations table
685 **************************************************************************/
686
687 struct meta_type_ops
688 {
689 void (*destroy)(struct meta_value *);
690 int (*compare)(struct meta_obj *, struct meta_obj *);
691 int (*change)(struct meta_value *, struct rtattr *);
692 void (*apply_extras)(struct meta_value *, struct meta_obj *);
693 int (*dump)(struct sk_buff *, struct meta_value *, int);
694 };
695
696 static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
697 [TCF_META_TYPE_VAR] = {
698 .destroy = meta_var_destroy,
699 .compare = meta_var_compare,
700 .change = meta_var_change,
701 .apply_extras = meta_var_apply_extras,
702 .dump = meta_var_dump
703 },
704 [TCF_META_TYPE_INT] = {
705 .compare = meta_int_compare,
706 .change = meta_int_change,
707 .apply_extras = meta_int_apply_extras,
708 .dump = meta_int_dump
709 }
710 };
711
712 static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
713 {
714 return &__meta_type_ops[meta_type(v)];
715 }
716
717 /**************************************************************************
718 * Core
719 **************************************************************************/
720
721 static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
722 struct meta_value *v, struct meta_obj *dst)
723 {
724 int err = 0;
725
726 if (meta_id(v) == TCF_META_ID_VALUE) {
727 dst->value = v->val;
728 dst->len = v->len;
729 return 0;
730 }
731
732 meta_ops(v)->get(skb, info, v, dst, &err);
733 if (err < 0)
734 return err;
735
736 if (meta_type_ops(v)->apply_extras)
737 meta_type_ops(v)->apply_extras(v, dst);
738
739 return 0;
740 }
741
742 static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
743 struct tcf_pkt_info *info)
744 {
745 int r;
746 struct meta_match *meta = (struct meta_match *) m->data;
747 struct meta_obj l_value, r_value;
748
749 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
750 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
751 return 0;
752
753 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
754
755 switch (meta->lvalue.hdr.op) {
756 case TCF_EM_OPND_EQ:
757 return !r;
758 case TCF_EM_OPND_LT:
759 return r < 0;
760 case TCF_EM_OPND_GT:
761 return r > 0;
762 }
763
764 return 0;
765 }
766
767 static inline void meta_delete(struct meta_match *meta)
768 {
769 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
770
771 if (ops && ops->destroy) {
772 ops->destroy(&meta->lvalue);
773 ops->destroy(&meta->rvalue);
774 }
775
776 kfree(meta);
777 }
778
779 static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
780 {
781 if (rta) {
782 if (RTA_PAYLOAD(rta) == 0)
783 return -EINVAL;
784
785 return meta_type_ops(dst)->change(dst, rta);
786 }
787
788 return 0;
789 }
790
791 static inline int meta_is_supported(struct meta_value *val)
792 {
793 return (!meta_id(val) || meta_ops(val)->get);
794 }
795
796 static int em_meta_change(struct tcf_proto *tp, void *data, int len,
797 struct tcf_ematch *m)
798 {
799 int err = -EINVAL;
800 struct rtattr *tb[TCA_EM_META_MAX];
801 struct tcf_meta_hdr *hdr;
802 struct meta_match *meta = NULL;
803
804 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
805 goto errout;
806
807 if (tb[TCA_EM_META_HDR-1] == NULL ||
808 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
809 goto errout;
810 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
811
812 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
813 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
814 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
815 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
816 goto errout;
817
818 meta = kmalloc(sizeof(*meta), GFP_KERNEL);
819 if (meta == NULL)
820 goto errout;
821 memset(meta, 0, sizeof(*meta));
822
823 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
824 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
825
826 if (!meta_is_supported(&meta->lvalue) ||
827 !meta_is_supported(&meta->rvalue)) {
828 err = -EOPNOTSUPP;
829 goto errout;
830 }
831
832 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
833 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
834 goto errout;
835
836 m->datalen = sizeof(*meta);
837 m->data = (unsigned long) meta;
838
839 err = 0;
840 errout:
841 if (err && meta)
842 meta_delete(meta);
843 return err;
844 }
845
846 static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
847 {
848 if (m)
849 meta_delete((struct meta_match *) m->data);
850 }
851
852 static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
853 {
854 struct meta_match *meta = (struct meta_match *) em->data;
855 struct tcf_meta_hdr hdr;
856 struct meta_type_ops *ops;
857
858 memset(&hdr, 0, sizeof(hdr));
859 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
860 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
861
862 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
863
864 ops = meta_type_ops(&meta->lvalue);
865 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
866 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
867 goto rtattr_failure;
868
869 return 0;
870
871 rtattr_failure:
872 return -1;
873 }
874
875 static struct tcf_ematch_ops em_meta_ops = {
876 .kind = TCF_EM_META,
877 .change = em_meta_change,
878 .match = em_meta_match,
879 .destroy = em_meta_destroy,
880 .dump = em_meta_dump,
881 .owner = THIS_MODULE,
882 .link = LIST_HEAD_INIT(em_meta_ops.link)
883 };
884
885 static int __init init_em_meta(void)
886 {
887 return tcf_em_register(&em_meta_ops);
888 }
889
890 static void __exit exit_em_meta(void)
891 {
892 tcf_em_unregister(&em_meta_ops);
893 }
894
895 MODULE_LICENSE("GPL");
896
897 module_init(init_em_meta);
898 module_exit(exit_em_meta);
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