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tc: add meta match on receive hash
[net-next-2.6.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 * ==========================================================================
10297b99 12 *
1da177e4
LT		 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
3a4fa0a2 58 * only available if that subsystem is enabled in the kernel.
1da177e4
LT		 59 */
60
5a0e3ad6 61#include <linux/slab.h>
1da177e4
LT		 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>
3113e88c 69#include <linux/if_vlan.h>
1da177e4
LT		 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>
48900629 74#include <net/sock.h>
1da177e4
LT		 75
76struct meta_obj
77{
78 unsigned long value;
79 unsigned int len;
80};
81
82struct meta_value
83{
84 struct tcf_meta_val hdr;
85 unsigned long val;
86 unsigned int len;
87};
88
89struct meta_match
90{
91 struct meta_value lvalue;
92 struct meta_value rvalue;
93};
94
95static inline int meta_id(struct meta_value *v)
96{
97 return TCF_META_ID(v->hdr.kind);
98}
99
100static inline int meta_type(struct meta_value *v)
101{
102 return TCF_META_TYPE(v->hdr.kind);
103}
104
105#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
106 struct tcf_pkt_info *info, struct meta_value *v, \
107 struct meta_obj *dst, int *err)
108
109/**************************************************************************
110 * System status & misc
111 **************************************************************************/
112
113META_COLLECTOR(int_random)
114{
115 get_random_bytes(&dst->value, sizeof(dst->value));
116}
117
118static inline unsigned long fixed_loadavg(int load)
119{
120 int rnd_load = load + (FIXED_1/200);
121 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
122
123 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
124}
125
126META_COLLECTOR(int_loadavg_0)
127{
128 dst->value = fixed_loadavg(avenrun[0]);
129}
130
131META_COLLECTOR(int_loadavg_1)
132{
133 dst->value = fixed_loadavg(avenrun[1]);
134}
135
136META_COLLECTOR(int_loadavg_2)
137{
138 dst->value = fixed_loadavg(avenrun[2]);
139}
140
141/**************************************************************************
142 * Device names & indices
143 **************************************************************************/
144
145static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
146{
147 if (unlikely(dev == NULL))
148 return -1;
149
150 dst->value = dev->ifindex;
151 return 0;
152}
153
154static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
155{
156 if (unlikely(dev == NULL))
157 return -1;
158
159 dst->value = (unsigned long) dev->name;
160 dst->len = strlen(dev->name);
161 return 0;
162}
163
164META_COLLECTOR(int_dev)
165{
166 *err = int_dev(skb->dev, dst);
167}
168
169META_COLLECTOR(var_dev)
170{
171 *err = var_dev(skb->dev, dst);
172}
173
3113e88c
SH		 174/**************************************************************************
175 * vlan tag
176 **************************************************************************/
177
178META_COLLECTOR(int_vlan_tag)
179{
1a31f204
SH		 180 unsigned short tag;
181
182 tag = vlan_tx_tag_get(skb);
183 if (!tag && __vlan_get_tag(skb, &tag))
3113e88c
SH		 184 *err = -1;
185 else
186 dst->value = tag;
187}
188
189
190
1da177e4
LT		 191/**************************************************************************
192 * skb attributes
193 **************************************************************************/
194
195META_COLLECTOR(int_priority)
196{
197 dst->value = skb->priority;
198}
199
200META_COLLECTOR(int_protocol)
201{
202 /* Let userspace take care of the byte ordering */
203 dst->value = skb->protocol;
204}
205
1da177e4
LT		 206META_COLLECTOR(int_pkttype)
207{
208 dst->value = skb->pkt_type;
209}
210
211META_COLLECTOR(int_pktlen)
212{
213 dst->value = skb->len;
214}
215
216META_COLLECTOR(int_datalen)
217{
218 dst->value = skb->data_len;
219}
220
221META_COLLECTOR(int_maclen)
222{
223 dst->value = skb->mac_len;
224}
225
c2e3143e
SH		 226META_COLLECTOR(int_rxhash)
227{
228 dst->value = skb_get_rxhash(skb);
229}
230
1da177e4
LT		 231/**************************************************************************
232 * Netfilter
233 **************************************************************************/
234
82e91ffe 235META_COLLECTOR(int_mark)
1da177e4 236{
82e91ffe 237 dst->value = skb->mark;
7686ee1a 238}
1da177e4
LT		 239
240/**************************************************************************
241 * Traffic Control
242 **************************************************************************/
243
244META_COLLECTOR(int_tcindex)
245{
246 dst->value = skb->tc_index;
247}
248
1da177e4
LT		 249/**************************************************************************
250 * Routing
251 **************************************************************************/
252
1da177e4
LT		 253META_COLLECTOR(int_rtclassid)
254{
adf30907 255 if (unlikely(skb_dst(skb) == NULL))
1da177e4
LT		 256 *err = -1;
257 else
7686ee1a 258#ifdef CONFIG_NET_CLS_ROUTE
adf30907 259 dst->value = skb_dst(skb)->tclassid;
7686ee1a
PM		 260#else
261 dst->value = 0;
1da177e4 262#endif
7686ee1a 263}
1da177e4
LT		 264
265META_COLLECTOR(int_rtiif)
266{
511c3f92 267 if (unlikely(skb_rtable(skb) == NULL))
1da177e4
LT		 268 *err = -1;
269 else
511c3f92 270 dst->value = skb_rtable(skb)->fl.iif;
1da177e4
LT		 271}
272
48900629
TG		 273/**************************************************************************
274 * Socket Attributes
275 **************************************************************************/
276
277#define SKIP_NONLOCAL(skb) \
278 if (unlikely(skb->sk == NULL)) { \
279 *err = -1; \
280 return; \
281 }
282
283META_COLLECTOR(int_sk_family)
284{
285 SKIP_NONLOCAL(skb);
286 dst->value = skb->sk->sk_family;
287}
288
289META_COLLECTOR(int_sk_state)
290{
291 SKIP_NONLOCAL(skb);
292 dst->value = skb->sk->sk_state;
293}
294
295META_COLLECTOR(int_sk_reuse)
296{
297 SKIP_NONLOCAL(skb);
298 dst->value = skb->sk->sk_reuse;
299}
300
301META_COLLECTOR(int_sk_bound_if)
302{
303 SKIP_NONLOCAL(skb);
304 /* No error if bound_dev_if is 0, legal userspace check */
305 dst->value = skb->sk->sk_bound_dev_if;
306}
307
308META_COLLECTOR(var_sk_bound_if)
309{
310 SKIP_NONLOCAL(skb);
311
d0075634 312 if (skb->sk->sk_bound_dev_if == 0) {
48900629
TG		 313 dst->value = (unsigned long) "any";
314 dst->len = 3;
d0075634 315 } else {
48900629 316 struct net_device *dev;
10297b99 317
d0075634 318 rcu_read_lock();
2939e275
ED		 319 dev = dev_get_by_index_rcu(sock_net(skb->sk),
320 skb->sk->sk_bound_dev_if);
48900629 321 *err = var_dev(dev, dst);
d0075634
ED		 322 rcu_read_unlock();
323 }
48900629
TG		 324}
325
326META_COLLECTOR(int_sk_refcnt)
327{
328 SKIP_NONLOCAL(skb);
329 dst->value = atomic_read(&skb->sk->sk_refcnt);
330}
331
332META_COLLECTOR(int_sk_rcvbuf)
333{
334 SKIP_NONLOCAL(skb);
335 dst->value = skb->sk->sk_rcvbuf;
336}
337
338META_COLLECTOR(int_sk_shutdown)
339{
340 SKIP_NONLOCAL(skb);
341 dst->value = skb->sk->sk_shutdown;
342}
343
344META_COLLECTOR(int_sk_proto)
345{
346 SKIP_NONLOCAL(skb);
347 dst->value = skb->sk->sk_protocol;
348}
349
350META_COLLECTOR(int_sk_type)
351{
352 SKIP_NONLOCAL(skb);
353 dst->value = skb->sk->sk_type;
354}
355
356META_COLLECTOR(int_sk_rmem_alloc)
357{
358 SKIP_NONLOCAL(skb);
31e6d363 359 dst->value = sk_rmem_alloc_get(skb->sk);
48900629
TG		 360}
361
362META_COLLECTOR(int_sk_wmem_alloc)
363{
364 SKIP_NONLOCAL(skb);
31e6d363 365 dst->value = sk_wmem_alloc_get(skb->sk);
48900629
TG		 366}
367
368META_COLLECTOR(int_sk_omem_alloc)
369{
370 SKIP_NONLOCAL(skb);
371 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
372}
373
374META_COLLECTOR(int_sk_rcv_qlen)
375{
376 SKIP_NONLOCAL(skb);
377 dst->value = skb->sk->sk_receive_queue.qlen;
378}
379
380META_COLLECTOR(int_sk_snd_qlen)
381{
382 SKIP_NONLOCAL(skb);
383 dst->value = skb->sk->sk_write_queue.qlen;
384}
385
386META_COLLECTOR(int_sk_wmem_queued)
387{
388 SKIP_NONLOCAL(skb);
389 dst->value = skb->sk->sk_wmem_queued;
390}
391
392META_COLLECTOR(int_sk_fwd_alloc)
393{
394 SKIP_NONLOCAL(skb);
395 dst->value = skb->sk->sk_forward_alloc;
396}
397
398META_COLLECTOR(int_sk_sndbuf)
399{
400 SKIP_NONLOCAL(skb);
401 dst->value = skb->sk->sk_sndbuf;
402}
403
404META_COLLECTOR(int_sk_alloc)
405{
406 SKIP_NONLOCAL(skb);
407 dst->value = skb->sk->sk_allocation;
408}
409
410META_COLLECTOR(int_sk_route_caps)
411{
412 SKIP_NONLOCAL(skb);
413 dst->value = skb->sk->sk_route_caps;
414}
415
81c3d547 416META_COLLECTOR(int_sk_hash)
48900629
TG		 417{
418 SKIP_NONLOCAL(skb);
81c3d547 419 dst->value = skb->sk->sk_hash;
48900629
TG		 420}
421
422META_COLLECTOR(int_sk_lingertime)
423{
424 SKIP_NONLOCAL(skb);
425 dst->value = skb->sk->sk_lingertime / HZ;
426}
427
428META_COLLECTOR(int_sk_err_qlen)
429{
430 SKIP_NONLOCAL(skb);
431 dst->value = skb->sk->sk_error_queue.qlen;
432}
433
434META_COLLECTOR(int_sk_ack_bl)
435{
436 SKIP_NONLOCAL(skb);
437 dst->value = skb->sk->sk_ack_backlog;
438}
439
440META_COLLECTOR(int_sk_max_ack_bl)
441{
442 SKIP_NONLOCAL(skb);
443 dst->value = skb->sk->sk_max_ack_backlog;
444}
445
446META_COLLECTOR(int_sk_prio)
447{
448 SKIP_NONLOCAL(skb);
449 dst->value = skb->sk->sk_priority;
450}
451
452META_COLLECTOR(int_sk_rcvlowat)
453{
454 SKIP_NONLOCAL(skb);
455 dst->value = skb->sk->sk_rcvlowat;
456}
457
458META_COLLECTOR(int_sk_rcvtimeo)
459{
460 SKIP_NONLOCAL(skb);
461 dst->value = skb->sk->sk_rcvtimeo / HZ;
462}
463
464META_COLLECTOR(int_sk_sndtimeo)
465{
466 SKIP_NONLOCAL(skb);
467 dst->value = skb->sk->sk_sndtimeo / HZ;
468}
469
470META_COLLECTOR(int_sk_sendmsg_off)
471{
472 SKIP_NONLOCAL(skb);
473 dst->value = skb->sk->sk_sndmsg_off;
474}
475
476META_COLLECTOR(int_sk_write_pend)
477{
478 SKIP_NONLOCAL(skb);
479 dst->value = skb->sk->sk_write_pending;
480}
481
1da177e4
LT		 482/**************************************************************************
483 * Meta value collectors assignment table
484 **************************************************************************/
485
486struct meta_ops
487{
488 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
489 struct meta_value *, struct meta_obj *, int *);
490};
491
48900629
TG		 492#define META_ID(name) TCF_META_ID_##name
493#define META_FUNC(name) { .get = meta_##name }
494
1da177e4
LT		 495/* Meta value operations table listing all meta value collectors and
496 * assigns them to a type and meta id. */
497static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
498 [TCF_META_TYPE_VAR] = {
48900629 499 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 500 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 501 },
502 [TCF_META_TYPE_INT] = {
48900629
TG		 503 [META_ID(RANDOM)] = META_FUNC(int_random),
504 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
505 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
506 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
507 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 508 [META_ID(PRIORITY)] = META_FUNC(int_priority),
509 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 510 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
511 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
512 [META_ID(DATALEN)] = META_FUNC(int_datalen),
513 [META_ID(MACLEN)] = META_FUNC(int_maclen),
82e91ffe 514 [META_ID(NFMARK)] = META_FUNC(int_mark),
48900629 515 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 516 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 517 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
518 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
519 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
520 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
521 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
522 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
523 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
524 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
525 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
526 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
527 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
528 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
529 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
530 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
531 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
532 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
533 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
534 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
535 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
536 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
537 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 538 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 539 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
540 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
541 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
542 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
543 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
544 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
545 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
546 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
547 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
3113e88c 548 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
c2e3143e 549 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
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
add93b61 572static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 573{
add93b61 574 int len = nla_len(nla);
1da177e4 575
add93b61 576 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
1da177e4
LT		 577 if (dst->val == 0UL)
578 return -ENOMEM;
1da177e4
LT		 579 dst->len = len;
580 return 0;
581}
582
583static void meta_var_destroy(struct meta_value *v)
584{
a51482bd 585 kfree((void *) v->val);
1da177e4
LT		 586}
587
588static void meta_var_apply_extras(struct meta_value *v,
589 struct meta_obj *dst)
590{
591 int shift = v->hdr.shift;
592
593 if (shift && shift < dst->len)
594 dst->len -= shift;
595}
596
597static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
598{
599 if (v->val && v->len)
add93b61 600 NLA_PUT(skb, tlv, v->len, (void *) v->val);
1da177e4
LT		 601 return 0;
602
add93b61 603nla_put_failure:
1da177e4
LT		 604 return -1;
605}
606
607/**************************************************************************
608 * Type specific operations for TCF_META_TYPE_INT
609 **************************************************************************/
610
611static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
612{
613 /* Let gcc optimize it, the unlikely is not really based on
614 * some numbers but jump free code for mismatches seems
615 * more logical. */
98e56405 616 if (unlikely(a->value == b->value))
1da177e4 617 return 0;
98e56405 618 else if (a->value < b->value)
1da177e4
LT		 619 return -1;
620 else
621 return 1;
622}
623
add93b61 624static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 625{
add93b61
PM		 626 if (nla_len(nla) >= sizeof(unsigned long)) {
627 dst->val = *(unsigned long *) nla_data(nla);
1da177e4 628 dst->len = sizeof(unsigned long);
add93b61 629 } else if (nla_len(nla) == sizeof(u32)) {
1587bac4 630 dst->val = nla_get_u32(nla);
1da177e4
LT		 631 dst->len = sizeof(u32);
632 } else
633 return -EINVAL;
634
635 return 0;
636}
637
638static void meta_int_apply_extras(struct meta_value *v,
639 struct meta_obj *dst)
640{
641 if (v->hdr.shift)
642 dst->value >>= v->hdr.shift;
643
644 if (v->val)
645 dst->value &= v->val;
646}
647
648static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
649{
650 if (v->len == sizeof(unsigned long))
add93b61 651 NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
1da177e4 652 else if (v->len == sizeof(u32)) {
24beeab5 653 NLA_PUT_U32(skb, tlv, v->val);
1da177e4
LT		 654 }
655
656 return 0;
657
add93b61 658nla_put_failure:
1da177e4
LT		 659 return -1;
660}
661
662/**************************************************************************
663 * Type specific operations table
664 **************************************************************************/
665
666struct meta_type_ops
667{
668 void (*destroy)(struct meta_value *);
669 int (*compare)(struct meta_obj *, struct meta_obj *);
add93b61 670 int (*change)(struct meta_value *, struct nlattr *);
1da177e4
LT		 671 void (*apply_extras)(struct meta_value *, struct meta_obj *);
672 int (*dump)(struct sk_buff *, struct meta_value *, int);
673};
674
675static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
676 [TCF_META_TYPE_VAR] = {
677 .destroy = meta_var_destroy,
678 .compare = meta_var_compare,
679 .change = meta_var_change,
680 .apply_extras = meta_var_apply_extras,
681 .dump = meta_var_dump
682 },
683 [TCF_META_TYPE_INT] = {
684 .compare = meta_int_compare,
685 .change = meta_int_change,
686 .apply_extras = meta_int_apply_extras,
687 .dump = meta_int_dump
688 }
689};
690
691static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
692{
693 return &__meta_type_ops[meta_type(v)];
694}
695
696/**************************************************************************
697 * Core
698 **************************************************************************/
699
ed7af3b3
SH		 700static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
701 struct meta_value *v, struct meta_obj *dst)
1da177e4
LT		 702{
703 int err = 0;
704
705 if (meta_id(v) == TCF_META_ID_VALUE) {
706 dst->value = v->val;
707 dst->len = v->len;
708 return 0;
709 }
710
711 meta_ops(v)->get(skb, info, v, dst, &err);
712 if (err < 0)
713 return err;
714
715 if (meta_type_ops(v)->apply_extras)
716 meta_type_ops(v)->apply_extras(v, dst);
717
718 return 0;
719}
720
721static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
722 struct tcf_pkt_info *info)
723{
724 int r;
725 struct meta_match *meta = (struct meta_match *) m->data;
726 struct meta_obj l_value, r_value;
727
728 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
729 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
730 return 0;
731
732 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
733
734 switch (meta->lvalue.hdr.op) {
735 case TCF_EM_OPND_EQ:
736 return !r;
737 case TCF_EM_OPND_LT:
738 return r < 0;
739 case TCF_EM_OPND_GT:
740 return r > 0;
741 }
742
743 return 0;
744}
745
ed7af3b3 746static void meta_delete(struct meta_match *meta)
1da177e4 747{
04f217ac
SH		 748 if (meta) {
749 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
1da177e4 750
04f217ac
SH		 751 if (ops && ops->destroy) {
752 ops->destroy(&meta->lvalue);
753 ops->destroy(&meta->rvalue);
754 }
1da177e4
LT		 755 }
756
757 kfree(meta);
758}
759
add93b61 760static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
1da177e4 761{
add93b61
PM		 762 if (nla) {
763 if (nla_len(nla) == 0)
1da177e4
LT		 764 return -EINVAL;
765
add93b61 766 return meta_type_ops(dst)->change(dst, nla);
1da177e4
LT		 767 }
768
769 return 0;
770}
771
772static inline int meta_is_supported(struct meta_value *val)
773{
774 return (!meta_id(val) || meta_ops(val)->get);
775}
776
7a9c1bd4
PM		 777static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
778 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
779};
780
1da177e4
LT		 781static int em_meta_change(struct tcf_proto *tp, void *data, int len,
782 struct tcf_ematch *m)
783{
cee63723 784 int err;
add93b61 785 struct nlattr *tb[TCA_EM_META_MAX + 1];
1da177e4
LT		 786 struct tcf_meta_hdr *hdr;
787 struct meta_match *meta = NULL;
10297b99 788
7a9c1bd4 789 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
cee63723 790 if (err < 0)
1da177e4
LT		 791 goto errout;
792
cee63723 793 err = -EINVAL;
7a9c1bd4 794 if (tb[TCA_EM_META_HDR] == NULL)
1da177e4 795 goto errout;
add93b61 796 hdr = nla_data(tb[TCA_EM_META_HDR]);
1da177e4
LT		 797
798 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
799 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
800 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
801 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
802 goto errout;
803
0da974f4 804 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 805 if (meta == NULL)
806 goto errout;
1da177e4
LT		 807
808 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
809 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
810
811 if (!meta_is_supported(&meta->lvalue) ||
812 !meta_is_supported(&meta->rvalue)) {
813 err = -EOPNOTSUPP;
814 goto errout;
815 }
816
add93b61
PM		 817 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
818 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
1da177e4
LT		 819 goto errout;
820
821 m->datalen = sizeof(*meta);
822 m->data = (unsigned long) meta;
823
824 err = 0;
825errout:
826 if (err && meta)
827 meta_delete(meta);
828 return err;
829}
830
831static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
832{
833 if (m)
834 meta_delete((struct meta_match *) m->data);
835}
836
837static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
838{
839 struct meta_match *meta = (struct meta_match *) em->data;
840 struct tcf_meta_hdr hdr;
841 struct meta_type_ops *ops;
842
843 memset(&hdr, 0, sizeof(hdr));
844 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
845 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
846
add93b61 847 NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
1da177e4
LT		 848
849 ops = meta_type_ops(&meta->lvalue);
850 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
851 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
add93b61 852 goto nla_put_failure;
1da177e4
LT		 853
854 return 0;
855
add93b61 856nla_put_failure:
1da177e4 857 return -1;
10297b99 858}
1da177e4
LT		 859
860static struct tcf_ematch_ops em_meta_ops = {
861 .kind = TCF_EM_META,
862 .change = em_meta_change,
863 .match = em_meta_match,
864 .destroy = em_meta_destroy,
865 .dump = em_meta_dump,
866 .owner = THIS_MODULE,
867 .link = LIST_HEAD_INIT(em_meta_ops.link)
868};
869
870static int __init init_em_meta(void)
871{
872 return tcf_em_register(&em_meta_ops);
873}
874
10297b99 875static void __exit exit_em_meta(void)
1da177e4
LT		 876{
877 tcf_em_unregister(&em_meta_ops);
878}
879
880MODULE_LICENSE("GPL");
881
882module_init(init_em_meta);
883module_exit(exit_em_meta);
db3d99c0
PM		 884
885MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
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