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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 |
261688d0 30 * def | id: DEV | | id: VALUE |
1da177e4
LT		 31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
261688d0 34 * ---> meta_ops[INT][DEV](...) |
48900629 35 * | |
1da177e4
LT		 36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
261688d0 40 * obj | id: DEV | | id: VALUE |
1da177e4
LT		 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
1da177e4
LT		 173/**************************************************************************
174 * skb attributes
175 **************************************************************************/
176
177META_COLLECTOR(int_priority)
178{
179 dst->value = skb->priority;
180}
181
182META_COLLECTOR(int_protocol)
183{
184 /* Let userspace take care of the byte ordering */
185 dst->value = skb->protocol;
186}
187
1da177e4
LT		 188META_COLLECTOR(int_pkttype)
189{
190 dst->value = skb->pkt_type;
191}
192
193META_COLLECTOR(int_pktlen)
194{
195 dst->value = skb->len;
196}
197
198META_COLLECTOR(int_datalen)
199{
200 dst->value = skb->data_len;
201}
202
203META_COLLECTOR(int_maclen)
204{
205 dst->value = skb->mac_len;
206}
207
208/**************************************************************************
209 * Netfilter
210 **************************************************************************/
211
1da177e4
LT		 212META_COLLECTOR(int_nfmark)
213{
7686ee1a 214#ifdef CONFIG_NETFILTER
1da177e4 215 dst->value = skb->nfmark;
7686ee1a
PM		 216#else
217 dst->value = 0;
1da177e4 218#endif
7686ee1a 219}
1da177e4
LT		 220
221/**************************************************************************
222 * Traffic Control
223 **************************************************************************/
224
225META_COLLECTOR(int_tcindex)
226{
227 dst->value = skb->tc_index;
228}
229
1da177e4
LT		 230/**************************************************************************
231 * Routing
232 **************************************************************************/
233
1da177e4
LT		 234META_COLLECTOR(int_rtclassid)
235{
236 if (unlikely(skb->dst == NULL))
237 *err = -1;
238 else
7686ee1a 239#ifdef CONFIG_NET_CLS_ROUTE
1da177e4 240 dst->value = skb->dst->tclassid;
7686ee1a
PM		 241#else
242 dst->value = 0;
1da177e4 243#endif
7686ee1a 244}
1da177e4
LT		 245
246META_COLLECTOR(int_rtiif)
247{
248 if (unlikely(skb->dst == NULL))
249 *err = -1;
250 else
251 dst->value = ((struct rtable*) skb->dst)->fl.iif;
252}
253
48900629
TG		 254/**************************************************************************
255 * Socket Attributes
256 **************************************************************************/
257
258#define SKIP_NONLOCAL(skb) \
259 if (unlikely(skb->sk == NULL)) { \
260 *err = -1; \
261 return; \
262 }
263
264META_COLLECTOR(int_sk_family)
265{
266 SKIP_NONLOCAL(skb);
267 dst->value = skb->sk->sk_family;
268}
269
270META_COLLECTOR(int_sk_state)
271{
272 SKIP_NONLOCAL(skb);
273 dst->value = skb->sk->sk_state;
274}
275
276META_COLLECTOR(int_sk_reuse)
277{
278 SKIP_NONLOCAL(skb);
279 dst->value = skb->sk->sk_reuse;
280}
281
282META_COLLECTOR(int_sk_bound_if)
283{
284 SKIP_NONLOCAL(skb);
285 /* No error if bound_dev_if is 0, legal userspace check */
286 dst->value = skb->sk->sk_bound_dev_if;
287}
288
289META_COLLECTOR(var_sk_bound_if)
290{
291 SKIP_NONLOCAL(skb);
292
293 if (skb->sk->sk_bound_dev_if == 0) {
294 dst->value = (unsigned long) "any";
295 dst->len = 3;
296 } else {
297 struct net_device *dev;
298
299 dev = dev_get_by_index(skb->sk->sk_bound_dev_if);
300 *err = var_dev(dev, dst);
301 if (dev)
302 dev_put(dev);
303 }
304}
305
306META_COLLECTOR(int_sk_refcnt)
307{
308 SKIP_NONLOCAL(skb);
309 dst->value = atomic_read(&skb->sk->sk_refcnt);
310}
311
312META_COLLECTOR(int_sk_rcvbuf)
313{
314 SKIP_NONLOCAL(skb);
315 dst->value = skb->sk->sk_rcvbuf;
316}
317
318META_COLLECTOR(int_sk_shutdown)
319{
320 SKIP_NONLOCAL(skb);
321 dst->value = skb->sk->sk_shutdown;
322}
323
324META_COLLECTOR(int_sk_proto)
325{
326 SKIP_NONLOCAL(skb);
327 dst->value = skb->sk->sk_protocol;
328}
329
330META_COLLECTOR(int_sk_type)
331{
332 SKIP_NONLOCAL(skb);
333 dst->value = skb->sk->sk_type;
334}
335
336META_COLLECTOR(int_sk_rmem_alloc)
337{
338 SKIP_NONLOCAL(skb);
339 dst->value = atomic_read(&skb->sk->sk_rmem_alloc);
340}
341
342META_COLLECTOR(int_sk_wmem_alloc)
343{
344 SKIP_NONLOCAL(skb);
345 dst->value = atomic_read(&skb->sk->sk_wmem_alloc);
346}
347
348META_COLLECTOR(int_sk_omem_alloc)
349{
350 SKIP_NONLOCAL(skb);
351 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
352}
353
354META_COLLECTOR(int_sk_rcv_qlen)
355{
356 SKIP_NONLOCAL(skb);
357 dst->value = skb->sk->sk_receive_queue.qlen;
358}
359
360META_COLLECTOR(int_sk_snd_qlen)
361{
362 SKIP_NONLOCAL(skb);
363 dst->value = skb->sk->sk_write_queue.qlen;
364}
365
366META_COLLECTOR(int_sk_wmem_queued)
367{
368 SKIP_NONLOCAL(skb);
369 dst->value = skb->sk->sk_wmem_queued;
370}
371
372META_COLLECTOR(int_sk_fwd_alloc)
373{
374 SKIP_NONLOCAL(skb);
375 dst->value = skb->sk->sk_forward_alloc;
376}
377
378META_COLLECTOR(int_sk_sndbuf)
379{
380 SKIP_NONLOCAL(skb);
381 dst->value = skb->sk->sk_sndbuf;
382}
383
384META_COLLECTOR(int_sk_alloc)
385{
386 SKIP_NONLOCAL(skb);
387 dst->value = skb->sk->sk_allocation;
388}
389
390META_COLLECTOR(int_sk_route_caps)
391{
392 SKIP_NONLOCAL(skb);
393 dst->value = skb->sk->sk_route_caps;
394}
395
81c3d547 396META_COLLECTOR(int_sk_hash)
48900629
TG		 397{
398 SKIP_NONLOCAL(skb);
81c3d547 399 dst->value = skb->sk->sk_hash;
48900629
TG		 400}
401
402META_COLLECTOR(int_sk_lingertime)
403{
404 SKIP_NONLOCAL(skb);
405 dst->value = skb->sk->sk_lingertime / HZ;
406}
407
408META_COLLECTOR(int_sk_err_qlen)
409{
410 SKIP_NONLOCAL(skb);
411 dst->value = skb->sk->sk_error_queue.qlen;
412}
413
414META_COLLECTOR(int_sk_ack_bl)
415{
416 SKIP_NONLOCAL(skb);
417 dst->value = skb->sk->sk_ack_backlog;
418}
419
420META_COLLECTOR(int_sk_max_ack_bl)
421{
422 SKIP_NONLOCAL(skb);
423 dst->value = skb->sk->sk_max_ack_backlog;
424}
425
426META_COLLECTOR(int_sk_prio)
427{
428 SKIP_NONLOCAL(skb);
429 dst->value = skb->sk->sk_priority;
430}
431
432META_COLLECTOR(int_sk_rcvlowat)
433{
434 SKIP_NONLOCAL(skb);
435 dst->value = skb->sk->sk_rcvlowat;
436}
437
438META_COLLECTOR(int_sk_rcvtimeo)
439{
440 SKIP_NONLOCAL(skb);
441 dst->value = skb->sk->sk_rcvtimeo / HZ;
442}
443
444META_COLLECTOR(int_sk_sndtimeo)
445{
446 SKIP_NONLOCAL(skb);
447 dst->value = skb->sk->sk_sndtimeo / HZ;
448}
449
450META_COLLECTOR(int_sk_sendmsg_off)
451{
452 SKIP_NONLOCAL(skb);
453 dst->value = skb->sk->sk_sndmsg_off;
454}
455
456META_COLLECTOR(int_sk_write_pend)
457{
458 SKIP_NONLOCAL(skb);
459 dst->value = skb->sk->sk_write_pending;
460}
461
1da177e4
LT		 462/**************************************************************************
463 * Meta value collectors assignment table
464 **************************************************************************/
465
466struct meta_ops
467{
468 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
469 struct meta_value *, struct meta_obj *, int *);
470};
471
48900629
TG		 472#define META_ID(name) TCF_META_ID_##name
473#define META_FUNC(name) { .get = meta_##name }
474
1da177e4
LT		 475/* Meta value operations table listing all meta value collectors and
476 * assigns them to a type and meta id. */
477static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
478 [TCF_META_TYPE_VAR] = {
48900629 479 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 480 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 481 },
482 [TCF_META_TYPE_INT] = {
48900629
TG		 483 [META_ID(RANDOM)] = META_FUNC(int_random),
484 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
485 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
486 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
487 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 488 [META_ID(PRIORITY)] = META_FUNC(int_priority),
489 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 490 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
491 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
492 [META_ID(DATALEN)] = META_FUNC(int_datalen),
493 [META_ID(MACLEN)] = META_FUNC(int_maclen),
48900629 494 [META_ID(NFMARK)] = META_FUNC(int_nfmark),
48900629 495 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 496 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 497 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
498 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
499 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
500 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
501 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
502 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
503 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
504 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
505 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
506 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
507 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
508 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
509 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
510 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
511 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
512 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
513 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
514 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
515 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
516 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
517 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 518 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 519 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
520 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
521 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
522 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
523 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
524 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
525 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
526 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
527 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
1da177e4
LT		 528 }
529};
530
531static inline struct meta_ops * meta_ops(struct meta_value *val)
532{
533 return &__meta_ops[meta_type(val)][meta_id(val)];
534}
535
536/**************************************************************************
537 * Type specific operations for TCF_META_TYPE_VAR
538 **************************************************************************/
539
540static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
541{
542 int r = a->len - b->len;
543
544 if (r == 0)
545 r = memcmp((void *) a->value, (void *) b->value, a->len);
546
547 return r;
548}
549
550static int meta_var_change(struct meta_value *dst, struct rtattr *rta)
551{
552 int len = RTA_PAYLOAD(rta);
553
554 dst->val = (unsigned long) kmalloc(len, GFP_KERNEL);
555 if (dst->val == 0UL)
556 return -ENOMEM;
557 memcpy((void *) dst->val, RTA_DATA(rta), len);
558 dst->len = len;
559 return 0;
560}
561
562static void meta_var_destroy(struct meta_value *v)
563{
a51482bd 564 kfree((void *) v->val);
1da177e4
LT		 565}
566
567static void meta_var_apply_extras(struct meta_value *v,
568 struct meta_obj *dst)
569{
570 int shift = v->hdr.shift;
571
572 if (shift && shift < dst->len)
573 dst->len -= shift;
574}
575
576static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
577{
578 if (v->val && v->len)
579 RTA_PUT(skb, tlv, v->len, (void *) v->val);
580 return 0;
581
582rtattr_failure:
583 return -1;
584}
585
586/**************************************************************************
587 * Type specific operations for TCF_META_TYPE_INT
588 **************************************************************************/
589
590static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
591{
592 /* Let gcc optimize it, the unlikely is not really based on
593 * some numbers but jump free code for mismatches seems
594 * more logical. */
98e56405 595 if (unlikely(a->value == b->value))
1da177e4 596 return 0;
98e56405 597 else if (a->value < b->value)
1da177e4
LT		 598 return -1;
599 else
600 return 1;
601}
602
603static int meta_int_change(struct meta_value *dst, struct rtattr *rta)
604{
605 if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) {
606 dst->val = *(unsigned long *) RTA_DATA(rta);
607 dst->len = sizeof(unsigned long);
608 } else if (RTA_PAYLOAD(rta) == sizeof(u32)) {
609 dst->val = *(u32 *) RTA_DATA(rta);
610 dst->len = sizeof(u32);
611 } else
612 return -EINVAL;
613
614 return 0;
615}
616
617static void meta_int_apply_extras(struct meta_value *v,
618 struct meta_obj *dst)
619{
620 if (v->hdr.shift)
621 dst->value >>= v->hdr.shift;
622
623 if (v->val)
624 dst->value &= v->val;
625}
626
627static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
628{
629 if (v->len == sizeof(unsigned long))
630 RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
631 else if (v->len == sizeof(u32)) {
632 u32 d = v->val;
633 RTA_PUT(skb, tlv, sizeof(d), &d);
634 }
635
636 return 0;
637
638rtattr_failure:
639 return -1;
640}
641
642/**************************************************************************
643 * Type specific operations table
644 **************************************************************************/
645
646struct meta_type_ops
647{
648 void (*destroy)(struct meta_value *);
649 int (*compare)(struct meta_obj *, struct meta_obj *);
650 int (*change)(struct meta_value *, struct rtattr *);
651 void (*apply_extras)(struct meta_value *, struct meta_obj *);
652 int (*dump)(struct sk_buff *, struct meta_value *, int);
653};
654
655static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
656 [TCF_META_TYPE_VAR] = {
657 .destroy = meta_var_destroy,
658 .compare = meta_var_compare,
659 .change = meta_var_change,
660 .apply_extras = meta_var_apply_extras,
661 .dump = meta_var_dump
662 },
663 [TCF_META_TYPE_INT] = {
664 .compare = meta_int_compare,
665 .change = meta_int_change,
666 .apply_extras = meta_int_apply_extras,
667 .dump = meta_int_dump
668 }
669};
670
671static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
672{
673 return &__meta_type_ops[meta_type(v)];
674}
675
676/**************************************************************************
677 * Core
678 **************************************************************************/
679
680static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
681 struct meta_value *v, struct meta_obj *dst)
682{
683 int err = 0;
684
685 if (meta_id(v) == TCF_META_ID_VALUE) {
686 dst->value = v->val;
687 dst->len = v->len;
688 return 0;
689 }
690
691 meta_ops(v)->get(skb, info, v, dst, &err);
692 if (err < 0)
693 return err;
694
695 if (meta_type_ops(v)->apply_extras)
696 meta_type_ops(v)->apply_extras(v, dst);
697
698 return 0;
699}
700
701static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
702 struct tcf_pkt_info *info)
703{
704 int r;
705 struct meta_match *meta = (struct meta_match *) m->data;
706 struct meta_obj l_value, r_value;
707
708 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
709 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
710 return 0;
711
712 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
713
714 switch (meta->lvalue.hdr.op) {
715 case TCF_EM_OPND_EQ:
716 return !r;
717 case TCF_EM_OPND_LT:
718 return r < 0;
719 case TCF_EM_OPND_GT:
720 return r > 0;
721 }
722
723 return 0;
724}
725
726static inline void meta_delete(struct meta_match *meta)
727{
728 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
729
730 if (ops && ops->destroy) {
731 ops->destroy(&meta->lvalue);
732 ops->destroy(&meta->rvalue);
733 }
734
735 kfree(meta);
736}
737
738static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta)
739{
740 if (rta) {
741 if (RTA_PAYLOAD(rta) == 0)
742 return -EINVAL;
743
744 return meta_type_ops(dst)->change(dst, rta);
745 }
746
747 return 0;
748}
749
750static inline int meta_is_supported(struct meta_value *val)
751{
752 return (!meta_id(val) || meta_ops(val)->get);
753}
754
755static int em_meta_change(struct tcf_proto *tp, void *data, int len,
756 struct tcf_ematch *m)
757{
758 int err = -EINVAL;
759 struct rtattr *tb[TCA_EM_META_MAX];
760 struct tcf_meta_hdr *hdr;
761 struct meta_match *meta = NULL;
762
763 if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0)
764 goto errout;
765
766 if (tb[TCA_EM_META_HDR-1] == NULL ||
767 RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr))
768 goto errout;
769 hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]);
770
771 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
772 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
773 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
774 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
775 goto errout;
776
777 meta = kmalloc(sizeof(*meta), GFP_KERNEL);
778 if (meta == NULL)
779 goto errout;
780 memset(meta, 0, sizeof(*meta));
781
782 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
783 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
784
785 if (!meta_is_supported(&meta->lvalue) ||
786 !meta_is_supported(&meta->rvalue)) {
787 err = -EOPNOTSUPP;
788 goto errout;
789 }
790
791 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 ||
792 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0)
793 goto errout;
794
795 m->datalen = sizeof(*meta);
796 m->data = (unsigned long) meta;
797
798 err = 0;
799errout:
800 if (err && meta)
801 meta_delete(meta);
802 return err;
803}
804
805static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
806{
807 if (m)
808 meta_delete((struct meta_match *) m->data);
809}
810
811static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
812{
813 struct meta_match *meta = (struct meta_match *) em->data;
814 struct tcf_meta_hdr hdr;
815 struct meta_type_ops *ops;
816
817 memset(&hdr, 0, sizeof(hdr));
818 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
819 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
820
821 RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
822
823 ops = meta_type_ops(&meta->lvalue);
824 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
825 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
826 goto rtattr_failure;
827
828 return 0;
829
830rtattr_failure:
831 return -1;
832}
833
834static struct tcf_ematch_ops em_meta_ops = {
835 .kind = TCF_EM_META,
836 .change = em_meta_change,
837 .match = em_meta_match,
838 .destroy = em_meta_destroy,
839 .dump = em_meta_dump,
840 .owner = THIS_MODULE,
841 .link = LIST_HEAD_INIT(em_meta_ops.link)
842};
843
844static int __init init_em_meta(void)
845{
846 return tcf_em_register(&em_meta_ops);
847}
848
849static void __exit exit_em_meta(void)
850{
851 tcf_em_unregister(&em_meta_ops);
852}
853
854MODULE_LICENSE("GPL");
855
856module_init(init_em_meta);
857module_exit(exit_em_meta);
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