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[NETFILTER]: Fix ip6t_LOG MAC format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sched / em_meta.c
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1da177e4
LT		 1/*
2 * net/sched/em_meta.c Metadata ematch
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <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
1da177e4
LT		 183/**************************************************************************
184 * skb attributes
185 **************************************************************************/
186
187META_COLLECTOR(int_priority)
188{
189 dst->value = skb->priority;
190}
191
192META_COLLECTOR(int_protocol)
193{
194 /* Let userspace take care of the byte ordering */
195 dst->value = skb->protocol;
196}
197
1da177e4
LT		 198META_COLLECTOR(int_pkttype)
199{
200 dst->value = skb->pkt_type;
201}
202
203META_COLLECTOR(int_pktlen)
204{
205 dst->value = skb->len;
206}
207
208META_COLLECTOR(int_datalen)
209{
210 dst->value = skb->data_len;
211}
212
213META_COLLECTOR(int_maclen)
214{
215 dst->value = skb->mac_len;
216}
217
218/**************************************************************************
219 * Netfilter
220 **************************************************************************/
221
222#ifdef CONFIG_NETFILTER
223META_COLLECTOR(int_nfmark)
224{
225 dst->value = skb->nfmark;
226}
227#endif
228
229/**************************************************************************
230 * Traffic Control
231 **************************************************************************/
232
233META_COLLECTOR(int_tcindex)
234{
235 dst->value = skb->tc_index;
236}
237
238#ifdef CONFIG_NET_CLS_ACT
239META_COLLECTOR(int_tcverd)
240{
241 dst->value = skb->tc_verd;
242}
1da177e4
LT		 243#endif
244
245/**************************************************************************
246 * Routing
247 **************************************************************************/
248
249#ifdef CONFIG_NET_CLS_ROUTE
250META_COLLECTOR(int_rtclassid)
251{
252 if (unlikely(skb->dst == NULL))
253 *err = -1;
254 else
255 dst->value = skb->dst->tclassid;
256}
257#endif
258
259META_COLLECTOR(int_rtiif)
260{
261 if (unlikely(skb->dst == NULL))
262 *err = -1;
263 else
264 dst->value = ((struct rtable*) skb->dst)->fl.iif;
265}
266
48900629
TG		 267/**************************************************************************
268 * Socket Attributes
269 **************************************************************************/
270
271#define SKIP_NONLOCAL(skb) \
272 if (unlikely(skb->sk == NULL)) { \
273 *err = -1; \
274 return; \
275 }
276
277META_COLLECTOR(int_sk_family)
278{
279 SKIP_NONLOCAL(skb);
280 dst->value = skb->sk->sk_family;
281}
282
283META_COLLECTOR(int_sk_state)
284{
285 SKIP_NONLOCAL(skb);
286 dst->value = skb->sk->sk_state;
287}
288
289META_COLLECTOR(int_sk_reuse)
290{
291 SKIP_NONLOCAL(skb);
292 dst->value = skb->sk->sk_reuse;
293}
294
295META_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
302META_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 dev = dev_get_by_index(skb->sk->sk_bound_dev_if);
313 *err = var_dev(dev, dst);
314 if (dev)
315 dev_put(dev);
316 }
317}
318
319META_COLLECTOR(int_sk_refcnt)
320{
321 SKIP_NONLOCAL(skb);
322 dst->value = atomic_read(&skb->sk->sk_refcnt);
323}
324
325META_COLLECTOR(int_sk_rcvbuf)
326{
327 SKIP_NONLOCAL(skb);
328 dst->value = skb->sk->sk_rcvbuf;
329}
330
331META_COLLECTOR(int_sk_shutdown)
332{
333 SKIP_NONLOCAL(skb);
334 dst->value = skb->sk->sk_shutdown;
335}
336
337META_COLLECTOR(int_sk_proto)
338{
339 SKIP_NONLOCAL(skb);
340 dst->value = skb->sk->sk_protocol;
341}
342
343META_COLLECTOR(int_sk_type)
344{
345 SKIP_NONLOCAL(skb);
346 dst->value = skb->sk->sk_type;
347}
348
349META_COLLECTOR(int_sk_rmem_alloc)
350{
351 SKIP_NONLOCAL(skb);
352 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
353}
354
355META_COLLECTOR(int_sk_wmem_alloc)
356{
357 SKIP_NONLOCAL(skb);
358 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
359}
360
361META_COLLECTOR(int_sk_omem_alloc)
362{
363 SKIP_NONLOCAL(skb);
364 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
365}
366
367META_COLLECTOR(int_sk_rcv_qlen)
368{
369 SKIP_NONLOCAL(skb);
370 dst->value = skb->sk->sk_receive_queue.qlen;
371}
372
373META_COLLECTOR(int_sk_snd_qlen)
374{
375 SKIP_NONLOCAL(skb);
376 dst->value = skb->sk->sk_write_queue.qlen;
377}
378
379META_COLLECTOR(int_sk_wmem_queued)
380{
381 SKIP_NONLOCAL(skb);
382 dst->value = skb->sk->sk_wmem_queued;
383}
384
385META_COLLECTOR(int_sk_fwd_alloc)
386{
387 SKIP_NONLOCAL(skb);
388 dst->value = skb->sk->sk_forward_alloc;
389}
390
391META_COLLECTOR(int_sk_sndbuf)
392{
393 SKIP_NONLOCAL(skb);
394 dst->value = skb->sk->sk_sndbuf;
395}
396
397META_COLLECTOR(int_sk_alloc)
398{
399 SKIP_NONLOCAL(skb);
400 dst->value = skb->sk->sk_allocation;
401}
402
403META_COLLECTOR(int_sk_route_caps)
404{
405 SKIP_NONLOCAL(skb);
406 dst->value = skb->sk->sk_route_caps;
407}
408
409META_COLLECTOR(int_sk_hashent)
410{
411 SKIP_NONLOCAL(skb);
412 dst->value = skb->sk->sk_hashent;
413}
414
415META_COLLECTOR(int_sk_lingertime)
416{
417 SKIP_NONLOCAL(skb);
418 dst->value = skb->sk->sk_lingertime / HZ;
419}
420
421META_COLLECTOR(int_sk_err_qlen)
422{
423 SKIP_NONLOCAL(skb);
424 dst->value = skb->sk->sk_error_queue.qlen;
425}
426
427META_COLLECTOR(int_sk_ack_bl)
428{
429 SKIP_NONLOCAL(skb);
430 dst->value = skb->sk->sk_ack_backlog;
431}
432
433META_COLLECTOR(int_sk_max_ack_bl)
434{
435 SKIP_NONLOCAL(skb);
436 dst->value = skb->sk->sk_max_ack_backlog;
437}
438
439META_COLLECTOR(int_sk_prio)
440{
441 SKIP_NONLOCAL(skb);
442 dst->value = skb->sk->sk_priority;
443}
444
445META_COLLECTOR(int_sk_rcvlowat)
446{
447 SKIP_NONLOCAL(skb);
448 dst->value = skb->sk->sk_rcvlowat;
449}
450
451META_COLLECTOR(int_sk_rcvtimeo)
452{
453 SKIP_NONLOCAL(skb);
454 dst->value = skb->sk->sk_rcvtimeo / HZ;
455}
456
457META_COLLECTOR(int_sk_sndtimeo)
458{
459 SKIP_NONLOCAL(skb);
460 dst->value = skb->sk->sk_sndtimeo / HZ;
461}
462
463META_COLLECTOR(int_sk_sendmsg_off)
464{
465 SKIP_NONLOCAL(skb);
466 dst->value = skb->sk->sk_sndmsg_off;
467}
468
469META_COLLECTOR(int_sk_write_pend)
470{
471 SKIP_NONLOCAL(skb);
472 dst->value = skb->sk->sk_write_pending;
473}
474
1da177e4
LT		 475/**************************************************************************
476 * Meta value collectors assignment table
477 **************************************************************************/
478
479struct meta_ops
480{
481 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
482 struct meta_value *, struct meta_obj *, int *);
483};
484
48900629
TG		 485#define META_ID(name) TCF_META_ID_##name
486#define META_FUNC(name) { .get = meta_##name }
487
1da177e4
LT		 488/* Meta value operations table listing all meta value collectors and
489 * assigns them to a type and meta id. */
490static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
491 [TCF_META_TYPE_VAR] = {
48900629
TG		 492 [META_ID(DEV)] = META_FUNC(var_dev),
493 [META_ID(INDEV)] = META_FUNC(var_indev),
48900629 494 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 495 },
496 [TCF_META_TYPE_INT] = {
48900629
TG		 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(INDEV)] = META_FUNC(int_indev),
48900629
TG		 503 [META_ID(PRIORITY)] = META_FUNC(int_priority),
504 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 505 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
506 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
507 [META_ID(DATALEN)] = META_FUNC(int_datalen),
508 [META_ID(MACLEN)] = META_FUNC(int_maclen),
1da177e4 509#ifdef CONFIG_NETFILTER
48900629 510 [META_ID(NFMARK)] = META_FUNC(int_nfmark),
1da177e4 511#endif
48900629 512 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
1da177e4 513#ifdef CONFIG_NET_CLS_ACT
48900629 514 [META_ID(TCVERDICT)] = META_FUNC(int_tcverd),
1da177e4
LT		 515#endif
516#ifdef CONFIG_NET_CLS_ROUTE
48900629 517 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
1da177e4 518#endif
48900629
TG		 519 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
520 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
521 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
522 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
523 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
524 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
525 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
526 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
527 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
528 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
529 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
530 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
531 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
532 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
533 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
534 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
535 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
536 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
537 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
538 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
539 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
540 [META_ID(SK_HASHENT)] = META_FUNC(int_sk_hashent),
541 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
542 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
543 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
544 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
545 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
546 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
547 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
548 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
549 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
1da177e4
LT		 550 }
551};
552
553static inline struct meta_ops * meta_ops(struct meta_value *val)
554{
555 return &__meta_ops[meta_type(val)][meta_id(val)];
556}
557
558/**************************************************************************
559 * Type specific operations for TCF_META_TYPE_VAR
560 **************************************************************************/
561
562static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
563{
564 int r = a->len - b->len;
565
566 if (r == 0)
567 r = memcmp((void *) a->value, (void *) b->value, a->len);
568
569 return r;
570}
571
572static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
573{
574 int len = RTA_PAYLOAD(rta);
575
576 dst->val = (unsigned long) kmalloc(len, GFP_KERNEL);
577 if (dst->val == 0UL)
578 return -ENOMEM;
579 memcpy((void *) dst->val, RTA_DATA(rta), len);
580 dst->len = len;
581 return 0;
582}
583
584static void meta_var_destroy(struct meta_value *v)
585{
586 if (v->val)
587 kfree((void *) v->val);
588}
589
590static void meta_var_apply_extras(struct meta_value *v,
591 struct meta_obj *dst)
592{
593 int shift = v->hdr.shift;
594
595 if (shift && shift < dst->len)
596 dst->len -= shift;
597}
598
599static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
600{
601 if (v->val && v->len)
602 RTA_PUT(skb, tlv, v->len, (void *) v->val);
603 return 0;
604
605rtattr_failure:
606 return -1;
607}
608
609/**************************************************************************
610 * Type specific operations for TCF_META_TYPE_INT
611 **************************************************************************/
612
613static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
614{
615 /* Let gcc optimize it, the unlikely is not really based on
616 * some numbers but jump free code for mismatches seems
617 * more logical. */
98e56405 618 if (unlikely(a->value == b->value))
1da177e4 619 return 0;
98e56405 620 else if (a->value < b->value)
1da177e4
LT		 621 return -1;
622 else
623 return 1;
624}
625
626static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
627{
628 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
629 dst->val = *(unsigned long *) RTA_DATA(rta);
630 dst->len = sizeof(unsigned long);
631 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
632 dst->val = *(u32 *) RTA_DATA(rta);
633 dst->len = sizeof(u32);
634 } else
635 return -EINVAL;
636
637 return 0;
638}
639
640static void meta_int_apply_extras(struct meta_value *v,
641 struct meta_obj *dst)
642{
643 if (v->hdr.shift)
644 dst->value >>= v->hdr.shift;
645
646 if (v->val)
647 dst->value &= v->val;
648}
649
650static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
651{
652 if (v->len == sizeof(unsigned long))
653 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
654 else if (v->len == sizeof(u32)) {
655 u32 d = v->val;
656 RTA_PUT(skb, tlv, sizeof(d), &d);
657 }
658
659 return 0;
660
661rtattr_failure:
662 return -1;
663}
664
665/**************************************************************************
666 * Type specific operations table
667 **************************************************************************/
668
669struct meta_type_ops
670{
671 void (*destroy)(struct meta_value *);
672 int (*compare)(struct meta_obj *, struct meta_obj *);
673 int (*change)(struct meta_value *, struct rtattr *);
674 void (*apply_extras)(struct meta_value *, struct meta_obj *);
675 int (*dump)(struct sk_buff *, struct meta_value *, int);
676};
677
678static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
679 [TCF_META_TYPE_VAR] = {
680 .destroy = meta_var_destroy,
681 .compare = meta_var_compare,
682 .change = meta_var_change,
683 .apply_extras = meta_var_apply_extras,
684 .dump = meta_var_dump
685 },
686 [TCF_META_TYPE_INT] = {
687 .compare = meta_int_compare,
688 .change = meta_int_change,
689 .apply_extras = meta_int_apply_extras,
690 .dump = meta_int_dump
691 }
692};
693
694static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
695{
696 return &__meta_type_ops[meta_type(v)];
697}
698
699/**************************************************************************
700 * Core
701 **************************************************************************/
702
703static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
704 struct meta_value *v, struct meta_obj *dst)
705{
706 int err = 0;
707
708 if (meta_id(v) == TCF_META_ID_VALUE) {
709 dst->value = v->val;
710 dst->len = v->len;
711 return 0;
712 }
713
714 meta_ops(v)->get(skb, info, v, dst, &err);
715 if (err < 0)
716 return err;
717
718 if (meta_type_ops(v)->apply_extras)
719 meta_type_ops(v)->apply_extras(v, dst);
720
721 return 0;
722}
723
724static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
725 struct tcf_pkt_info *info)
726{
727 int r;
728 struct meta_match *meta = (struct meta_match *) m->data;
729 struct meta_obj l_value, r_value;
730
731 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
732 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
733 return 0;
734
735 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
736
737 switch (meta->lvalue.hdr.op) {
738 case TCF_EM_OPND_EQ:
739 return !r;
740 case TCF_EM_OPND_LT:
741 return r < 0;
742 case TCF_EM_OPND_GT:
743 return r > 0;
744 }
745
746 return 0;
747}
748
749static inline void meta_delete(struct meta_match *meta)
750{
751 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
752
753 if (ops && ops->destroy) {
754 ops->destroy(&meta->lvalue);
755 ops->destroy(&meta->rvalue);
756 }
757
758 kfree(meta);
759}
760
761static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
762{
763 if (rta) {
764 if (RTA_PAYLOAD(rta) == 0)
765 return -EINVAL;
766
767 return meta_type_ops(dst)->change(dst, rta);
768 }
769
770 return 0;
771}
772
773static inline int meta_is_supported(struct meta_value *val)
774{
775 return (!meta_id(val) || meta_ops(val)->get);
776}
777
778static int em_meta_change(struct tcf_proto *tp, void *data, int len,
779 struct tcf_ematch *m)
780{
781 int err = -EINVAL;
782 struct rtattr *tb[TCA_EM_META_MAX];
783 struct tcf_meta_hdr *hdr;
784 struct meta_match *meta = NULL;
785
786 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
787 goto errout;
788
789 if (tb[TCA_EM_META_HDR-1] == NULL ||
790 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
791 goto errout;
792 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
793
794 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
795 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
796 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
797 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
798 goto errout;
799
800 meta = kmalloc(sizeof(*meta), GFP_KERNEL);
801 if (meta == NULL)
802 goto errout;
803 memset(meta, 0, sizeof(*meta));
804
805 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
806 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
807
808 if (!meta_is_supported(&meta->lvalue) ||
809 !meta_is_supported(&meta->rvalue)) {
810 err = -EOPNOTSUPP;
811 goto errout;
812 }
813
814 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
815 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
816 goto errout;
817
818 m->datalen = sizeof(*meta);
819 m->data = (unsigned long) meta;
820
821 err = 0;
822errout:
823 if (err && meta)
824 meta_delete(meta);
825 return err;
826}
827
828static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
829{
830 if (m)
831 meta_delete((struct meta_match *) m->data);
832}
833
834static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
835{
836 struct meta_match *meta = (struct meta_match *) em->data;
837 struct tcf_meta_hdr hdr;
838 struct meta_type_ops *ops;
839
840 memset(&hdr, 0, sizeof(hdr));
841 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
842 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
843
844 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
845
846 ops = meta_type_ops(&meta->lvalue);
847 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
848 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
849 goto rtattr_failure;
850
851 return 0;
852
853rtattr_failure:
854 return -1;
855}
856
857static struct tcf_ematch_ops em_meta_ops = {
858 .kind = TCF_EM_META,
859 .change = em_meta_change,
860 .match = em_meta_match,
861 .destroy = em_meta_destroy,
862 .dump = em_meta_dump,
863 .owner = THIS_MODULE,
864 .link = LIST_HEAD_INIT(em_meta_ops.link)
865};
866
867static int __init init_em_meta(void)
868{
869 return tcf_em_register(&em_meta_ops);
870}
871
872static void __exit exit_em_meta(void)
873{
874 tcf_em_unregister(&em_meta_ops);
875}
876
877MODULE_LICENSE("GPL");
878
879module_init(init_em_meta);
880module_exit(exit_em_meta);
kernel source for telekom puls (alcatel/mediatek)