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[PKT_SCHED]: Allow socket attributes to be matched on via meta ematch
[deliverable/linux.git] / net / sched / em_meta.c
CommitLineData
1da177e4
LT		 1/*
2 * net/sched/em_meta.c Metadata ematch
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 *
11 * ==========================================================================
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](...) |
48900629 35 * | |
1da177e4
LT		 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>
48900629 73#include <net/sock.h>
1da177e4
LT		 74
75struct meta_obj
76{
77 unsigned long value;
78 unsigned int len;
79};
80
81struct meta_value
82{
83 struct tcf_meta_val hdr;
84 unsigned long val;
85 unsigned int len;
86};
87
88struct meta_match
89{
90 struct meta_value lvalue;
91 struct meta_value rvalue;
92};
93
94static inline int meta_id(struct meta_value *v)
95{
96 return TCF_META_ID(v->hdr.kind);
97}
98
99static 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
112META_COLLECTOR(int_random)
113{
114 get_random_bytes(&dst->value, sizeof(dst->value));
115}
116
117static 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
125META_COLLECTOR(int_loadavg_0)
126{
127 dst->value = fixed_loadavg(avenrun[0]);
128}
129
130META_COLLECTOR(int_loadavg_1)
131{
132 dst->value = fixed_loadavg(avenrun[1]);
133}
134
135META_COLLECTOR(int_loadavg_2)
136{
137 dst->value = fixed_loadavg(avenrun[2]);
138}
139
140/**************************************************************************
141 * Device names & indices
142 **************************************************************************/
143
144static 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
153static 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
163META_COLLECTOR(int_dev)
164{
165 *err = int_dev(skb->dev, dst);
166}
167
168META_COLLECTOR(var_dev)
169{
170 *err = var_dev(skb->dev, dst);
171}
172
173META_COLLECTOR(int_indev)
174{
175 *err = int_dev(skb->input_dev, dst);
176}
177
178META_COLLECTOR(var_indev)
179{
180 *err = var_dev(skb->input_dev, dst);
181}
182
183META_COLLECTOR(int_realdev)
184{
185 *err = int_dev(skb->real_dev, dst);
186}
187
188META_COLLECTOR(var_realdev)
189{
190 *err = var_dev(skb->real_dev, dst);
191}
192
193/**************************************************************************
194 * skb attributes
195 **************************************************************************/
196
197META_COLLECTOR(int_priority)
198{
199 dst->value = skb->priority;
200}
201
202META_COLLECTOR(int_protocol)
203{
204 /* Let userspace take care of the byte ordering */
205 dst->value = skb->protocol;
206}
207
208META_COLLECTOR(int_security)
209{
210 dst->value = skb->security;
211}
212
213META_COLLECTOR(int_pkttype)
214{
215 dst->value = skb->pkt_type;
216}
217
218META_COLLECTOR(int_pktlen)
219{
220 dst->value = skb->len;
221}
222
223META_COLLECTOR(int_datalen)
224{
225 dst->value = skb->data_len;
226}
227
228META_COLLECTOR(int_maclen)
229{
230 dst->value = skb->mac_len;
231}
232
233/**************************************************************************
234 * Netfilter
235 **************************************************************************/
236
237#ifdef CONFIG_NETFILTER
238META_COLLECTOR(int_nfmark)
239{
240 dst->value = skb->nfmark;
241}
242#endif
243
244/**************************************************************************
245 * Traffic Control
246 **************************************************************************/
247
248META_COLLECTOR(int_tcindex)
249{
250 dst->value = skb->tc_index;
251}
252
253#ifdef CONFIG_NET_CLS_ACT
254META_COLLECTOR(int_tcverd)
255{
256 dst->value = skb->tc_verd;
257}
258
259META_COLLECTOR(int_tcclassid)
260{
261 dst->value = skb->tc_classid;
262}
263#endif
264
265/**************************************************************************
266 * Routing
267 **************************************************************************/
268
269#ifdef CONFIG_NET_CLS_ROUTE
270META_COLLECTOR(int_rtclassid)
271{
272 if (unlikely(skb->dst == NULL))
273 *err = -1;
274 else
275 dst->value = skb->dst->tclassid;
276}
277#endif
278
279META_COLLECTOR(int_rtiif)
280{
281 if (unlikely(skb->dst == NULL))
282 *err = -1;
283 else
284 dst->value = ((struct rtable*) skb->dst)->fl.iif;
285}
286
48900629
TG		 287/**************************************************************************
288 * Socket Attributes
289 **************************************************************************/
290
291#define SKIP_NONLOCAL(skb) \
292 if (unlikely(skb->sk == NULL)) { \
293 *err = -1; \
294 return; \
295 }
296
297META_COLLECTOR(int_sk_family)
298{
299 SKIP_NONLOCAL(skb);
300 dst->value = skb->sk->sk_family;
301}
302
303META_COLLECTOR(int_sk_state)
304{
305 SKIP_NONLOCAL(skb);
306 dst->value = skb->sk->sk_state;
307}
308
309META_COLLECTOR(int_sk_reuse)
310{
311 SKIP_NONLOCAL(skb);
312 dst->value = skb->sk->sk_reuse;
313}
314
315META_COLLECTOR(int_sk_bound_if)
316{
317 SKIP_NONLOCAL(skb);
318 /* No error if bound_dev_if is 0, legal userspace check */
319 dst->value = skb->sk->sk_bound_dev_if;
320}
321
322META_COLLECTOR(var_sk_bound_if)
323{
324 SKIP_NONLOCAL(skb);
325
326 if (skb->sk->sk_bound_dev_if == 0) {
327 dst->value = (unsigned long) "any";
328 dst->len = 3;
329 } else {
330 struct net_device *dev;
331
332 dev = dev_get_by_index(skb->sk->sk_bound_dev_if);
333 *err = var_dev(dev, dst);
334 if (dev)
335 dev_put(dev);
336 }
337}
338
339META_COLLECTOR(int_sk_refcnt)
340{
341 SKIP_NONLOCAL(skb);
342 dst->value = atomic_read(&skb->sk->sk_refcnt);
343}
344
345META_COLLECTOR(int_sk_rcvbuf)
346{
347 SKIP_NONLOCAL(skb);
348 dst->value = skb->sk->sk_rcvbuf;
349}
350
351META_COLLECTOR(int_sk_shutdown)
352{
353 SKIP_NONLOCAL(skb);
354 dst->value = skb->sk->sk_shutdown;
355}
356
357META_COLLECTOR(int_sk_proto)
358{
359 SKIP_NONLOCAL(skb);
360 dst->value = skb->sk->sk_protocol;
361}
362
363META_COLLECTOR(int_sk_type)
364{
365 SKIP_NONLOCAL(skb);
366 dst->value = skb->sk->sk_type;
367}
368
369META_COLLECTOR(int_sk_rmem_alloc)
370{
371 SKIP_NONLOCAL(skb);
372 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
373}
374
375META_COLLECTOR(int_sk_wmem_alloc)
376{
377 SKIP_NONLOCAL(skb);
378 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
379}
380
381META_COLLECTOR(int_sk_omem_alloc)
382{
383 SKIP_NONLOCAL(skb);
384 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
385}
386
387META_COLLECTOR(int_sk_rcv_qlen)
388{
389 SKIP_NONLOCAL(skb);
390 dst->value = skb->sk->sk_receive_queue.qlen;
391}
392
393META_COLLECTOR(int_sk_snd_qlen)
394{
395 SKIP_NONLOCAL(skb);
396 dst->value = skb->sk->sk_write_queue.qlen;
397}
398
399META_COLLECTOR(int_sk_wmem_queued)
400{
401 SKIP_NONLOCAL(skb);
402 dst->value = skb->sk->sk_wmem_queued;
403}
404
405META_COLLECTOR(int_sk_fwd_alloc)
406{
407 SKIP_NONLOCAL(skb);
408 dst->value = skb->sk->sk_forward_alloc;
409}
410
411META_COLLECTOR(int_sk_sndbuf)
412{
413 SKIP_NONLOCAL(skb);
414 dst->value = skb->sk->sk_sndbuf;
415}
416
417META_COLLECTOR(int_sk_alloc)
418{
419 SKIP_NONLOCAL(skb);
420 dst->value = skb->sk->sk_allocation;
421}
422
423META_COLLECTOR(int_sk_route_caps)
424{
425 SKIP_NONLOCAL(skb);
426 dst->value = skb->sk->sk_route_caps;
427}
428
429META_COLLECTOR(int_sk_hashent)
430{
431 SKIP_NONLOCAL(skb);
432 dst->value = skb->sk->sk_hashent;
433}
434
435META_COLLECTOR(int_sk_lingertime)
436{
437 SKIP_NONLOCAL(skb);
438 dst->value = skb->sk->sk_lingertime / HZ;
439}
440
441META_COLLECTOR(int_sk_err_qlen)
442{
443 SKIP_NONLOCAL(skb);
444 dst->value = skb->sk->sk_error_queue.qlen;
445}
446
447META_COLLECTOR(int_sk_ack_bl)
448{
449 SKIP_NONLOCAL(skb);
450 dst->value = skb->sk->sk_ack_backlog;
451}
452
453META_COLLECTOR(int_sk_max_ack_bl)
454{
455 SKIP_NONLOCAL(skb);
456 dst->value = skb->sk->sk_max_ack_backlog;
457}
458
459META_COLLECTOR(int_sk_prio)
460{
461 SKIP_NONLOCAL(skb);
462 dst->value = skb->sk->sk_priority;
463}
464
465META_COLLECTOR(int_sk_rcvlowat)
466{
467 SKIP_NONLOCAL(skb);
468 dst->value = skb->sk->sk_rcvlowat;
469}
470
471META_COLLECTOR(int_sk_rcvtimeo)
472{
473 SKIP_NONLOCAL(skb);
474 dst->value = skb->sk->sk_rcvtimeo / HZ;
475}
476
477META_COLLECTOR(int_sk_sndtimeo)
478{
479 SKIP_NONLOCAL(skb);
480 dst->value = skb->sk->sk_sndtimeo / HZ;
481}
482
483META_COLLECTOR(int_sk_sendmsg_off)
484{
485 SKIP_NONLOCAL(skb);
486 dst->value = skb->sk->sk_sndmsg_off;
487}
488
489META_COLLECTOR(int_sk_write_pend)
490{
491 SKIP_NONLOCAL(skb);
492 dst->value = skb->sk->sk_write_pending;
493}
494
1da177e4
LT		 495/**************************************************************************
496 * Meta value collectors assignment table
497 **************************************************************************/
498
499struct meta_ops
500{
501 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
502 struct meta_value *, struct meta_obj *, int *);
503};
504
48900629
TG		 505#define META_ID(name) TCF_META_ID_##name
506#define META_FUNC(name) { .get = meta_##name }
507
1da177e4
LT		 508/* Meta value operations table listing all meta value collectors and
509 * assigns them to a type and meta id. */
510static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
511 [TCF_META_TYPE_VAR] = {
48900629
TG		 512 [META_ID(DEV)] = META_FUNC(var_dev),
513 [META_ID(INDEV)] = META_FUNC(var_indev),
514 [META_ID(REALDEV)] = META_FUNC(var_realdev),
515 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 516 },
517 [TCF_META_TYPE_INT] = {
48900629
TG		 518 [META_ID(RANDOM)] = META_FUNC(int_random),
519 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
520 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
521 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
522 [META_ID(DEV)] = META_FUNC(int_dev),
523 [META_ID(INDEV)] = META_FUNC(int_indev),
524 [META_ID(REALDEV)] = META_FUNC(int_realdev),
525 [META_ID(PRIORITY)] = META_FUNC(int_priority),
526 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
527 [META_ID(SECURITY)] = META_FUNC(int_security),
528 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
529 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
530 [META_ID(DATALEN)] = META_FUNC(int_datalen),
531 [META_ID(MACLEN)] = META_FUNC(int_maclen),
1da177e4 532#ifdef CONFIG_NETFILTER
48900629 533 [META_ID(NFMARK)] = META_FUNC(int_nfmark),
1da177e4 534#endif
48900629 535 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
1da177e4 536#ifdef CONFIG_NET_CLS_ACT
48900629
TG		 537 [META_ID(TCVERDICT)] = META_FUNC(int_tcverd),
538 [META_ID(TCCLASSID)] = META_FUNC(int_tcclassid),
1da177e4
LT		 539#endif
540#ifdef CONFIG_NET_CLS_ROUTE
48900629 541 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
1da177e4 542#endif
48900629
TG		 543 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
544 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
545 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
546 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
547 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
548 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
549 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
550 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
551 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
552 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
553 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
554 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
555 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
556 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
557 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
558 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
559 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
560 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
561 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
562 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
563 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
564 [META_ID(SK_HASHENT)] = META_FUNC(int_sk_hashent),
565 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
566 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
567 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
568 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
569 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
570 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
571 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
572 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
573 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
1da177e4
LT		 574 }
575};
576
577static inline struct meta_ops * meta_ops(struct meta_value *val)
578{
579 return &__meta_ops[meta_type(val)][meta_id(val)];
580}
581
582/**************************************************************************
583 * Type specific operations for TCF_META_TYPE_VAR
584 **************************************************************************/
585
586static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
587{
588 int r = a->len - b->len;
589
590 if (r == 0)
591 r = memcmp((void *) a->value, (void *) b->value, a->len);
592
593 return r;
594}
595
596static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
597{
598 int len = RTA_PAYLOAD(rta);
599
600 dst->val = (unsigned long) kmalloc(len, GFP_KERNEL);
601 if (dst->val == 0UL)
602 return -ENOMEM;
603 memcpy((void *) dst->val, RTA_DATA(rta), len);
604 dst->len = len;
605 return 0;
606}
607
608static void meta_var_destroy(struct meta_value *v)
609{
610 if (v->val)
611 kfree((void *) v->val);
612}
613
614static void meta_var_apply_extras(struct meta_value *v,
615 struct meta_obj *dst)
616{
617 int shift = v->hdr.shift;
618
619 if (shift && shift < dst->len)
620 dst->len -= shift;
621}
622
623static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
624{
625 if (v->val && v->len)
626 RTA_PUT(skb, tlv, v->len, (void *) v->val);
627 return 0;
628
629rtattr_failure:
630 return -1;
631}
632
633/**************************************************************************
634 * Type specific operations for TCF_META_TYPE_INT
635 **************************************************************************/
636
637static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
638{
639 /* Let gcc optimize it, the unlikely is not really based on
640 * some numbers but jump free code for mismatches seems
641 * more logical. */
642 if (unlikely(a == b))
643 return 0;
644 else if (a < b)
645 return -1;
646 else
647 return 1;
648}
649
650static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
651{
652 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
653 dst->val = *(unsigned long *) RTA_DATA(rta);
654 dst->len = sizeof(unsigned long);
655 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
656 dst->val = *(u32 *) RTA_DATA(rta);
657 dst->len = sizeof(u32);
658 } else
659 return -EINVAL;
660
661 return 0;
662}
663
664static void meta_int_apply_extras(struct meta_value *v,
665 struct meta_obj *dst)
666{
667 if (v->hdr.shift)
668 dst->value >>= v->hdr.shift;
669
670 if (v->val)
671 dst->value &= v->val;
672}
673
674static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
675{
676 if (v->len == sizeof(unsigned long))
677 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
678 else if (v->len == sizeof(u32)) {
679 u32 d = v->val;
680 RTA_PUT(skb, tlv, sizeof(d), &d);
681 }
682
683 return 0;
684
685rtattr_failure:
686 return -1;
687}
688
689/**************************************************************************
690 * Type specific operations table
691 **************************************************************************/
692
693struct meta_type_ops
694{
695 void (*destroy)(struct meta_value *);
696 int (*compare)(struct meta_obj *, struct meta_obj *);
697 int (*change)(struct meta_value *, struct rtattr *);
698 void (*apply_extras)(struct meta_value *, struct meta_obj *);
699 int (*dump)(struct sk_buff *, struct meta_value *, int);
700};
701
702static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
703 [TCF_META_TYPE_VAR] = {
704 .destroy = meta_var_destroy,
705 .compare = meta_var_compare,
706 .change = meta_var_change,
707 .apply_extras = meta_var_apply_extras,
708 .dump = meta_var_dump
709 },
710 [TCF_META_TYPE_INT] = {
711 .compare = meta_int_compare,
712 .change = meta_int_change,
713 .apply_extras = meta_int_apply_extras,
714 .dump = meta_int_dump
715 }
716};
717
718static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
719{
720 return &__meta_type_ops[meta_type(v)];
721}
722
723/**************************************************************************
724 * Core
725 **************************************************************************/
726
727static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
728 struct meta_value *v, struct meta_obj *dst)
729{
730 int err = 0;
731
732 if (meta_id(v) == TCF_META_ID_VALUE) {
733 dst->value = v->val;
734 dst->len = v->len;
735 return 0;
736 }
737
738 meta_ops(v)->get(skb, info, v, dst, &err);
739 if (err < 0)
740 return err;
741
742 if (meta_type_ops(v)->apply_extras)
743 meta_type_ops(v)->apply_extras(v, dst);
744
745 return 0;
746}
747
748static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
749 struct tcf_pkt_info *info)
750{
751 int r;
752 struct meta_match *meta = (struct meta_match *) m->data;
753 struct meta_obj l_value, r_value;
754
755 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
756 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
757 return 0;
758
759 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
760
761 switch (meta->lvalue.hdr.op) {
762 case TCF_EM_OPND_EQ:
763 return !r;
764 case TCF_EM_OPND_LT:
765 return r < 0;
766 case TCF_EM_OPND_GT:
767 return r > 0;
768 }
769
770 return 0;
771}
772
773static inline void meta_delete(struct meta_match *meta)
774{
775 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
776
777 if (ops && ops->destroy) {
778 ops->destroy(&meta->lvalue);
779 ops->destroy(&meta->rvalue);
780 }
781
782 kfree(meta);
783}
784
785static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
786{
787 if (rta) {
788 if (RTA_PAYLOAD(rta) == 0)
789 return -EINVAL;
790
791 return meta_type_ops(dst)->change(dst, rta);
792 }
793
794 return 0;
795}
796
797static inline int meta_is_supported(struct meta_value *val)
798{
799 return (!meta_id(val) || meta_ops(val)->get);
800}
801
802static int em_meta_change(struct tcf_proto *tp, void *data, int len,
803 struct tcf_ematch *m)
804{
805 int err = -EINVAL;
806 struct rtattr *tb[TCA_EM_META_MAX];
807 struct tcf_meta_hdr *hdr;
808 struct meta_match *meta = NULL;
809
810 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
811 goto errout;
812
813 if (tb[TCA_EM_META_HDR-1] == NULL ||
814 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
815 goto errout;
816 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
817
818 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
819 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
820 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
821 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
822 goto errout;
823
824 meta = kmalloc(sizeof(*meta), GFP_KERNEL);
825 if (meta == NULL)
826 goto errout;
827 memset(meta, 0, sizeof(*meta));
828
829 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
830 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
831
832 if (!meta_is_supported(&meta->lvalue) ||
833 !meta_is_supported(&meta->rvalue)) {
834 err = -EOPNOTSUPP;
835 goto errout;
836 }
837
838 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
839 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
840 goto errout;
841
842 m->datalen = sizeof(*meta);
843 m->data = (unsigned long) meta;
844
845 err = 0;
846errout:
847 if (err && meta)
848 meta_delete(meta);
849 return err;
850}
851
852static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
853{
854 if (m)
855 meta_delete((struct meta_match *) m->data);
856}
857
858static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
859{
860 struct meta_match *meta = (struct meta_match *) em->data;
861 struct tcf_meta_hdr hdr;
862 struct meta_type_ops *ops;
863
864 memset(&hdr, 0, sizeof(hdr));
865 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
866 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
867
868 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
869
870 ops = meta_type_ops(&meta->lvalue);
871 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
872 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
873 goto rtattr_failure;
874
875 return 0;
876
877rtattr_failure:
878 return -1;
879}
880
881static struct tcf_ematch_ops em_meta_ops = {
882 .kind = TCF_EM_META,
883 .change = em_meta_change,
884 .match = em_meta_match,
885 .destroy = em_meta_destroy,
886 .dump = em_meta_dump,
887 .owner = THIS_MODULE,
888 .link = LIST_HEAD_INIT(em_meta_ops.link)
889};
890
891static int __init init_em_meta(void)
892{
893 return tcf_em_register(&em_meta_ops);
894}
895
896static void __exit exit_em_meta(void)
897{
898 tcf_em_unregister(&em_meta_ops);
899}
900
901MODULE_LICENSE("GPL");
902
903module_init(init_em_meta);
904module_exit(exit_em_meta);
Linux kernel - Deliverables
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