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