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1/*
2 * net/sched/em_meta.c Metadata ematch
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 *
11 * ==========================================================================
12 *
13 * The metadata ematch compares two meta objects where each object
14 * represents either a meta value stored in the kernel or a static
15 * value provided by userspace. The objects are not provided by
16 * userspace itself but rather a definition providing the information
17 * to build them. Every object is of a certain type which must be
18 * equal to the object it is being compared to.
19 *
20 * The definition of a objects conists of the type (meta type), a
21 * identifier (meta id) and additional type specific information.
22 * The meta id is either TCF_META_TYPE_VALUE for values provided by
23 * userspace or a index to the meta operations table consisting of
24 * function pointers to type specific meta data collectors returning
25 * the value of the requested meta value.
26 *
27 * lvalue rvalue
28 * +-----------+ +-----------+
29 * | type: INT | | type: INT |
30 * def | id: DEV | | id: VALUE |
31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
34 * ---> meta_ops[INT][DEV](...) |
35 * | |
36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
40 * obj | id: DEV | | id: VALUE |
41 * | data: 2 |<--data got filled out | data: 3 |
42 * +-----------+ +-----------+
43 * | |
44 * --------------> 2 equals 3 <--------------
45 *
46 * This is a simplified schema, the complexity varies depending
47 * on the meta type. Obviously, the length of the data must also
48 * be provided for non-numeric types.
49 *
50 * Additionally, type dependent modifiers such as shift operators
51 * or mask may be applied to extend the functionaliy. As of now,
52 * the variable length type supports shifting the byte string to
53 * the right, eating up any number of octets and thus supporting
54 * wildcard interface name comparisons such as "ppp%" matching
55 * ppp0..9.
56 *
57 * NOTE: Certain meta values depend on other subsystems and are
58 * only available if that subsystem is enabled in the kernel.
59 */
60
61#include <linux/slab.h>
62#include <linux/module.h>
63#include <linux/types.h>
64#include <linux/kernel.h>
65#include <linux/sched.h>
66#include <linux/string.h>
67#include <linux/skbuff.h>
68#include <linux/random.h>
69#include <linux/if_vlan.h>
70#include <linux/tc_ematch/tc_em_meta.h>
71#include <net/dst.h>
72#include <net/route.h>
73#include <net/pkt_cls.h>
74#include <net/sock.h>
75
76struct meta_obj {
77 unsigned long value;
78 unsigned int len;
79};
80
81struct meta_value {
82 struct tcf_meta_val hdr;
83 unsigned long val;
84 unsigned int len;
85};
86
87struct meta_match {
88 struct meta_value lvalue;
89 struct meta_value rvalue;
90};
91
92static inline int meta_id(struct meta_value *v)
93{
94 return TCF_META_ID(v->hdr.kind);
95}
96
97static inline int meta_type(struct meta_value *v)
98{
99 return TCF_META_TYPE(v->hdr.kind);
100}
101
102#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
103 struct tcf_pkt_info *info, struct meta_value *v, \
104 struct meta_obj *dst, int *err)
105
106/**************************************************************************
107 * System status & misc
108 **************************************************************************/
109
110META_COLLECTOR(int_random)
111{
112 get_random_bytes(&dst->value, sizeof(dst->value));
113}
114
115static inline unsigned long fixed_loadavg(int load)
116{
117 int rnd_load = load + (FIXED_1/200);
118 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
119
120 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
121}
122
123META_COLLECTOR(int_loadavg_0)
124{
125 dst->value = fixed_loadavg(avenrun[0]);
126}
127
128META_COLLECTOR(int_loadavg_1)
129{
130 dst->value = fixed_loadavg(avenrun[1]);
131}
132
133META_COLLECTOR(int_loadavg_2)
134{
135 dst->value = fixed_loadavg(avenrun[2]);
136}
137
138/**************************************************************************
139 * Device names & indices
140 **************************************************************************/
141
142static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
143{
144 if (unlikely(dev == NULL))
145 return -1;
146
147 dst->value = dev->ifindex;
148 return 0;
149}
150
151static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
152{
153 if (unlikely(dev == NULL))
154 return -1;
155
156 dst->value = (unsigned long) dev->name;
157 dst->len = strlen(dev->name);
158 return 0;
159}
160
161META_COLLECTOR(int_dev)
162{
163 *err = int_dev(skb->dev, dst);
164}
165
166META_COLLECTOR(var_dev)
167{
168 *err = var_dev(skb->dev, dst);
169}
170
171/**************************************************************************
172 * vlan tag
173 **************************************************************************/
174
175META_COLLECTOR(int_vlan_tag)
176{
177 unsigned short tag;
178
179 tag = vlan_tx_tag_get(skb);
180 if (!tag && __vlan_get_tag(skb, &tag))
181 *err = -1;
182 else
183 dst->value = tag;
184}
185
186
187
188/**************************************************************************
189 * skb attributes
190 **************************************************************************/
191
192META_COLLECTOR(int_priority)
193{
194 dst->value = skb->priority;
195}
196
197META_COLLECTOR(int_protocol)
198{
199 /* Let userspace take care of the byte ordering */
200 dst->value = skb->protocol;
201}
202
203META_COLLECTOR(int_pkttype)
204{
205 dst->value = skb->pkt_type;
206}
207
208META_COLLECTOR(int_pktlen)
209{
210 dst->value = skb->len;
211}
212
213META_COLLECTOR(int_datalen)
214{
215 dst->value = skb->data_len;
216}
217
218META_COLLECTOR(int_maclen)
219{
220 dst->value = skb->mac_len;
221}
222
223META_COLLECTOR(int_rxhash)
224{
225 dst->value = skb_get_hash(skb);
226}
227
228/**************************************************************************
229 * Netfilter
230 **************************************************************************/
231
232META_COLLECTOR(int_mark)
233{
234 dst->value = skb->mark;
235}
236
237/**************************************************************************
238 * Traffic Control
239 **************************************************************************/
240
241META_COLLECTOR(int_tcindex)
242{
243 dst->value = skb->tc_index;
244}
245
246/**************************************************************************
247 * Routing
248 **************************************************************************/
249
250META_COLLECTOR(int_rtclassid)
251{
252 if (unlikely(skb_dst(skb) == NULL))
253 *err = -1;
254 else
255#ifdef CONFIG_IP_ROUTE_CLASSID
256 dst->value = skb_dst(skb)->tclassid;
257#else
258 dst->value = 0;
259#endif
260}
261
262META_COLLECTOR(int_rtiif)
263{
264 if (unlikely(skb_rtable(skb) == NULL))
265 *err = -1;
266 else
267 dst->value = inet_iif(skb);
268}
269
270/**************************************************************************
271 * Socket Attributes
272 **************************************************************************/
273
274#define skip_nonlocal(skb) \
275 (unlikely(skb->sk == NULL))
276
277META_COLLECTOR(int_sk_family)
278{
279 if (skip_nonlocal(skb)) {
280 *err = -1;
281 return;
282 }
283 dst->value = skb->sk->sk_family;
284}
285
286META_COLLECTOR(int_sk_state)
287{
288 if (skip_nonlocal(skb)) {
289 *err = -1;
290 return;
291 }
292 dst->value = skb->sk->sk_state;
293}
294
295META_COLLECTOR(int_sk_reuse)
296{
297 if (skip_nonlocal(skb)) {
298 *err = -1;
299 return;
300 }
301 dst->value = skb->sk->sk_reuse;
302}
303
304META_COLLECTOR(int_sk_bound_if)
305{
306 if (skip_nonlocal(skb)) {
307 *err = -1;
308 return;
309 }
310 /* No error if bound_dev_if is 0, legal userspace check */
311 dst->value = skb->sk->sk_bound_dev_if;
312}
313
314META_COLLECTOR(var_sk_bound_if)
315{
316 if (skip_nonlocal(skb)) {
317 *err = -1;
318 return;
319 }
320
321 if (skb->sk->sk_bound_dev_if == 0) {
322 dst->value = (unsigned long) "any";
323 dst->len = 3;
324 } else {
325 struct net_device *dev;
326
327 rcu_read_lock();
328 dev = dev_get_by_index_rcu(sock_net(skb->sk),
329 skb->sk->sk_bound_dev_if);
330 *err = var_dev(dev, dst);
331 rcu_read_unlock();
332 }
333}
334
335META_COLLECTOR(int_sk_refcnt)
336{
337 if (skip_nonlocal(skb)) {
338 *err = -1;
339 return;
340 }
341 dst->value = atomic_read(&skb->sk->sk_refcnt);
342}
343
344META_COLLECTOR(int_sk_rcvbuf)
345{
346 if (skip_nonlocal(skb)) {
347 *err = -1;
348 return;
349 }
350 dst->value = skb->sk->sk_rcvbuf;
351}
352
353META_COLLECTOR(int_sk_shutdown)
354{
355 if (skip_nonlocal(skb)) {
356 *err = -1;
357 return;
358 }
359 dst->value = skb->sk->sk_shutdown;
360}
361
362META_COLLECTOR(int_sk_proto)
363{
364 if (skip_nonlocal(skb)) {
365 *err = -1;
366 return;
367 }
368 dst->value = skb->sk->sk_protocol;
369}
370
371META_COLLECTOR(int_sk_type)
372{
373 if (skip_nonlocal(skb)) {
374 *err = -1;
375 return;
376 }
377 dst->value = skb->sk->sk_type;
378}
379
380META_COLLECTOR(int_sk_rmem_alloc)
381{
382 if (skip_nonlocal(skb)) {
383 *err = -1;
384 return;
385 }
386 dst->value = sk_rmem_alloc_get(skb->sk);
387}
388
389META_COLLECTOR(int_sk_wmem_alloc)
390{
391 if (skip_nonlocal(skb)) {
392 *err = -1;
393 return;
394 }
395 dst->value = sk_wmem_alloc_get(skb->sk);
396}
397
398META_COLLECTOR(int_sk_omem_alloc)
399{
400 if (skip_nonlocal(skb)) {
401 *err = -1;
402 return;
403 }
404 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
405}
406
407META_COLLECTOR(int_sk_rcv_qlen)
408{
409 if (skip_nonlocal(skb)) {
410 *err = -1;
411 return;
412 }
413 dst->value = skb->sk->sk_receive_queue.qlen;
414}
415
416META_COLLECTOR(int_sk_snd_qlen)
417{
418 if (skip_nonlocal(skb)) {
419 *err = -1;
420 return;
421 }
422 dst->value = skb->sk->sk_write_queue.qlen;
423}
424
425META_COLLECTOR(int_sk_wmem_queued)
426{
427 if (skip_nonlocal(skb)) {
428 *err = -1;
429 return;
430 }
431 dst->value = skb->sk->sk_wmem_queued;
432}
433
434META_COLLECTOR(int_sk_fwd_alloc)
435{
436 if (skip_nonlocal(skb)) {
437 *err = -1;
438 return;
439 }
440 dst->value = skb->sk->sk_forward_alloc;
441}
442
443META_COLLECTOR(int_sk_sndbuf)
444{
445 if (skip_nonlocal(skb)) {
446 *err = -1;
447 return;
448 }
449 dst->value = skb->sk->sk_sndbuf;
450}
451
452META_COLLECTOR(int_sk_alloc)
453{
454 if (skip_nonlocal(skb)) {
455 *err = -1;
456 return;
457 }
458 dst->value = (__force int) skb->sk->sk_allocation;
459}
460
461META_COLLECTOR(int_sk_hash)
462{
463 if (skip_nonlocal(skb)) {
464 *err = -1;
465 return;
466 }
467 dst->value = skb->sk->sk_hash;
468}
469
470META_COLLECTOR(int_sk_lingertime)
471{
472 if (skip_nonlocal(skb)) {
473 *err = -1;
474 return;
475 }
476 dst->value = skb->sk->sk_lingertime / HZ;
477}
478
479META_COLLECTOR(int_sk_err_qlen)
480{
481 if (skip_nonlocal(skb)) {
482 *err = -1;
483 return;
484 }
485 dst->value = skb->sk->sk_error_queue.qlen;
486}
487
488META_COLLECTOR(int_sk_ack_bl)
489{
490 if (skip_nonlocal(skb)) {
491 *err = -1;
492 return;
493 }
494 dst->value = skb->sk->sk_ack_backlog;
495}
496
497META_COLLECTOR(int_sk_max_ack_bl)
498{
499 if (skip_nonlocal(skb)) {
500 *err = -1;
501 return;
502 }
503 dst->value = skb->sk->sk_max_ack_backlog;
504}
505
506META_COLLECTOR(int_sk_prio)
507{
508 if (skip_nonlocal(skb)) {
509 *err = -1;
510 return;
511 }
512 dst->value = skb->sk->sk_priority;
513}
514
515META_COLLECTOR(int_sk_rcvlowat)
516{
517 if (skip_nonlocal(skb)) {
518 *err = -1;
519 return;
520 }
521 dst->value = skb->sk->sk_rcvlowat;
522}
523
524META_COLLECTOR(int_sk_rcvtimeo)
525{
526 if (skip_nonlocal(skb)) {
527 *err = -1;
528 return;
529 }
530 dst->value = skb->sk->sk_rcvtimeo / HZ;
531}
532
533META_COLLECTOR(int_sk_sndtimeo)
534{
535 if (skip_nonlocal(skb)) {
536 *err = -1;
537 return;
538 }
539 dst->value = skb->sk->sk_sndtimeo / HZ;
540}
541
542META_COLLECTOR(int_sk_sendmsg_off)
543{
544 if (skip_nonlocal(skb)) {
545 *err = -1;
546 return;
547 }
548 dst->value = skb->sk->sk_frag.offset;
549}
550
551META_COLLECTOR(int_sk_write_pend)
552{
553 if (skip_nonlocal(skb)) {
554 *err = -1;
555 return;
556 }
557 dst->value = skb->sk->sk_write_pending;
558}
559
560/**************************************************************************
561 * Meta value collectors assignment table
562 **************************************************************************/
563
564struct meta_ops {
565 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
566 struct meta_value *, struct meta_obj *, int *);
567};
568
569#define META_ID(name) TCF_META_ID_##name
570#define META_FUNC(name) { .get = meta_##name }
571
572/* Meta value operations table listing all meta value collectors and
573 * assigns them to a type and meta id. */
574static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
575 [TCF_META_TYPE_VAR] = {
576 [META_ID(DEV)] = META_FUNC(var_dev),
577 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
578 },
579 [TCF_META_TYPE_INT] = {
580 [META_ID(RANDOM)] = META_FUNC(int_random),
581 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
582 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
583 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
584 [META_ID(DEV)] = META_FUNC(int_dev),
585 [META_ID(PRIORITY)] = META_FUNC(int_priority),
586 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
587 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
588 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
589 [META_ID(DATALEN)] = META_FUNC(int_datalen),
590 [META_ID(MACLEN)] = META_FUNC(int_maclen),
591 [META_ID(NFMARK)] = META_FUNC(int_mark),
592 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
593 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
594 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
595 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
596 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
597 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
598 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
599 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
600 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
601 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
602 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
603 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
604 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
605 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
606 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
607 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
608 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
609 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
610 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
611 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
612 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
613 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
614 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
615 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
616 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
617 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
618 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
619 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
620 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
621 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
622 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
623 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
624 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
625 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
626 }
627};
628
629static inline struct meta_ops *meta_ops(struct meta_value *val)
630{
631 return &__meta_ops[meta_type(val)][meta_id(val)];
632}
633
634/**************************************************************************
635 * Type specific operations for TCF_META_TYPE_VAR
636 **************************************************************************/
637
638static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
639{
640 int r = a->len - b->len;
641
642 if (r == 0)
643 r = memcmp((void *) a->value, (void *) b->value, a->len);
644
645 return r;
646}
647
648static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
649{
650 int len = nla_len(nla);
651
652 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
653 if (dst->val == 0UL)
654 return -ENOMEM;
655 dst->len = len;
656 return 0;
657}
658
659static void meta_var_destroy(struct meta_value *v)
660{
661 kfree((void *) v->val);
662}
663
664static void meta_var_apply_extras(struct meta_value *v,
665 struct meta_obj *dst)
666{
667 int shift = v->hdr.shift;
668
669 if (shift && shift < dst->len)
670 dst->len -= shift;
671}
672
673static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
674{
675 if (v->val && v->len &&
676 nla_put(skb, tlv, v->len, (void *) v->val))
677 goto nla_put_failure;
678 return 0;
679
680nla_put_failure:
681 return -1;
682}
683
684/**************************************************************************
685 * Type specific operations for TCF_META_TYPE_INT
686 **************************************************************************/
687
688static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
689{
690 /* Let gcc optimize it, the unlikely is not really based on
691 * some numbers but jump free code for mismatches seems
692 * more logical. */
693 if (unlikely(a->value == b->value))
694 return 0;
695 else if (a->value < b->value)
696 return -1;
697 else
698 return 1;
699}
700
701static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
702{
703 if (nla_len(nla) >= sizeof(unsigned long)) {
704 dst->val = *(unsigned long *) nla_data(nla);
705 dst->len = sizeof(unsigned long);
706 } else if (nla_len(nla) == sizeof(u32)) {
707 dst->val = nla_get_u32(nla);
708 dst->len = sizeof(u32);
709 } else
710 return -EINVAL;
711
712 return 0;
713}
714
715static void meta_int_apply_extras(struct meta_value *v,
716 struct meta_obj *dst)
717{
718 if (v->hdr.shift)
719 dst->value >>= v->hdr.shift;
720
721 if (v->val)
722 dst->value &= v->val;
723}
724
725static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
726{
727 if (v->len == sizeof(unsigned long)) {
728 if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
729 goto nla_put_failure;
730 } else if (v->len == sizeof(u32)) {
731 if (nla_put_u32(skb, tlv, v->val))
732 goto nla_put_failure;
733 }
734
735 return 0;
736
737nla_put_failure:
738 return -1;
739}
740
741/**************************************************************************
742 * Type specific operations table
743 **************************************************************************/
744
745struct meta_type_ops {
746 void (*destroy)(struct meta_value *);
747 int (*compare)(struct meta_obj *, struct meta_obj *);
748 int (*change)(struct meta_value *, struct nlattr *);
749 void (*apply_extras)(struct meta_value *, struct meta_obj *);
750 int (*dump)(struct sk_buff *, struct meta_value *, int);
751};
752
753static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
754 [TCF_META_TYPE_VAR] = {
755 .destroy = meta_var_destroy,
756 .compare = meta_var_compare,
757 .change = meta_var_change,
758 .apply_extras = meta_var_apply_extras,
759 .dump = meta_var_dump
760 },
761 [TCF_META_TYPE_INT] = {
762 .compare = meta_int_compare,
763 .change = meta_int_change,
764 .apply_extras = meta_int_apply_extras,
765 .dump = meta_int_dump
766 }
767};
768
769static inline struct meta_type_ops *meta_type_ops(struct meta_value *v)
770{
771 return &__meta_type_ops[meta_type(v)];
772}
773
774/**************************************************************************
775 * Core
776 **************************************************************************/
777
778static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
779 struct meta_value *v, struct meta_obj *dst)
780{
781 int err = 0;
782
783 if (meta_id(v) == TCF_META_ID_VALUE) {
784 dst->value = v->val;
785 dst->len = v->len;
786 return 0;
787 }
788
789 meta_ops(v)->get(skb, info, v, dst, &err);
790 if (err < 0)
791 return err;
792
793 if (meta_type_ops(v)->apply_extras)
794 meta_type_ops(v)->apply_extras(v, dst);
795
796 return 0;
797}
798
799static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
800 struct tcf_pkt_info *info)
801{
802 int r;
803 struct meta_match *meta = (struct meta_match *) m->data;
804 struct meta_obj l_value, r_value;
805
806 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
807 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
808 return 0;
809
810 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
811
812 switch (meta->lvalue.hdr.op) {
813 case TCF_EM_OPND_EQ:
814 return !r;
815 case TCF_EM_OPND_LT:
816 return r < 0;
817 case TCF_EM_OPND_GT:
818 return r > 0;
819 }
820
821 return 0;
822}
823
824static void meta_delete(struct meta_match *meta)
825{
826 if (meta) {
827 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
828
829 if (ops && ops->destroy) {
830 ops->destroy(&meta->lvalue);
831 ops->destroy(&meta->rvalue);
832 }
833 }
834
835 kfree(meta);
836}
837
838static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
839{
840 if (nla) {
841 if (nla_len(nla) == 0)
842 return -EINVAL;
843
844 return meta_type_ops(dst)->change(dst, nla);
845 }
846
847 return 0;
848}
849
850static inline int meta_is_supported(struct meta_value *val)
851{
852 return !meta_id(val) || meta_ops(val)->get;
853}
854
855static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
856 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
857};
858
859static int em_meta_change(struct tcf_proto *tp, void *data, int len,
860 struct tcf_ematch *m)
861{
862 int err;
863 struct nlattr *tb[TCA_EM_META_MAX + 1];
864 struct tcf_meta_hdr *hdr;
865 struct meta_match *meta = NULL;
866
867 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
868 if (err < 0)
869 goto errout;
870
871 err = -EINVAL;
872 if (tb[TCA_EM_META_HDR] == NULL)
873 goto errout;
874 hdr = nla_data(tb[TCA_EM_META_HDR]);
875
876 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
877 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
878 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
879 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
880 goto errout;
881
882 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
883 if (meta == NULL) {
884 err = -ENOMEM;
885 goto errout;
886 }
887
888 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
889 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
890
891 if (!meta_is_supported(&meta->lvalue) ||
892 !meta_is_supported(&meta->rvalue)) {
893 err = -EOPNOTSUPP;
894 goto errout;
895 }
896
897 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
898 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
899 goto errout;
900
901 m->datalen = sizeof(*meta);
902 m->data = (unsigned long) meta;
903
904 err = 0;
905errout:
906 if (err && meta)
907 meta_delete(meta);
908 return err;
909}
910
911static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
912{
913 if (m)
914 meta_delete((struct meta_match *) m->data);
915}
916
917static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
918{
919 struct meta_match *meta = (struct meta_match *) em->data;
920 struct tcf_meta_hdr hdr;
921 struct meta_type_ops *ops;
922
923 memset(&hdr, 0, sizeof(hdr));
924 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
925 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
926
927 if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
928 goto nla_put_failure;
929
930 ops = meta_type_ops(&meta->lvalue);
931 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
932 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
933 goto nla_put_failure;
934
935 return 0;
936
937nla_put_failure:
938 return -1;
939}
940
941static struct tcf_ematch_ops em_meta_ops = {
942 .kind = TCF_EM_META,
943 .change = em_meta_change,
944 .match = em_meta_match,
945 .destroy = em_meta_destroy,
946 .dump = em_meta_dump,
947 .owner = THIS_MODULE,
948 .link = LIST_HEAD_INIT(em_meta_ops.link)
949};
950
951static int __init init_em_meta(void)
952{
953 return tcf_em_register(&em_meta_ops);
954}
955
956static void __exit exit_em_meta(void)
957{
958 tcf_em_unregister(&em_meta_ops);
959}
960
961MODULE_LICENSE("GPL");
962
963module_init(init_em_meta);
964module_exit(exit_em_meta);
965
966MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
1/*
2 * net/sched/em_meta.c Metadata ematch
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 *
11 * ==========================================================================
12 *
13 * The metadata ematch compares two meta objects where each object
14 * represents either a meta value stored in the kernel or a static
15 * value provided by userspace. The objects are not provided by
16 * userspace itself but rather a definition providing the information
17 * to build them. Every object is of a certain type which must be
18 * equal to the object it is being compared to.
19 *
20 * The definition of a objects conists of the type (meta type), a
21 * identifier (meta id) and additional type specific information.
22 * The meta id is either TCF_META_TYPE_VALUE for values provided by
23 * userspace or a index to the meta operations table consisting of
24 * function pointers to type specific meta data collectors returning
25 * the value of the requested meta value.
26 *
27 * lvalue rvalue
28 * +-----------+ +-----------+
29 * | type: INT | | type: INT |
30 * def | id: DEV | | id: VALUE |
31 * | data: | | data: 3 |
32 * +-----------+ +-----------+
33 * | |
34 * ---> meta_ops[INT][DEV](...) |
35 * | |
36 * ----------- |
37 * V V
38 * +-----------+ +-----------+
39 * | type: INT | | type: INT |
40 * obj | id: DEV | | id: VALUE |
41 * | data: 2 |<--data got filled out | data: 3 |
42 * +-----------+ +-----------+
43 * | |
44 * --------------> 2 equals 3 <--------------
45 *
46 * This is a simplified schema, the complexity varies depending
47 * on the meta type. Obviously, the length of the data must also
48 * be provided for non-numeric types.
49 *
50 * Additionally, type dependent modifiers such as shift operators
51 * or mask may be applied to extend the functionaliy. As of now,
52 * the variable length type supports shifting the byte string to
53 * the right, eating up any number of octets and thus supporting
54 * wildcard interface name comparisons such as "ppp%" matching
55 * ppp0..9.
56 *
57 * NOTE: Certain meta values depend on other subsystems and are
58 * only available if that subsystem is enabled in the kernel.
59 */
60
61#include <linux/slab.h>
62#include <linux/module.h>
63#include <linux/types.h>
64#include <linux/kernel.h>
65#include <linux/sched.h>
66#include <linux/string.h>
67#include <linux/skbuff.h>
68#include <linux/random.h>
69#include <linux/if_vlan.h>
70#include <linux/tc_ematch/tc_em_meta.h>
71#include <net/dst.h>
72#include <net/route.h>
73#include <net/pkt_cls.h>
74#include <net/sock.h>
75
76struct meta_obj {
77 unsigned long value;
78 unsigned int len;
79};
80
81struct meta_value {
82 struct tcf_meta_val hdr;
83 unsigned long val;
84 unsigned int len;
85};
86
87struct meta_match {
88 struct meta_value lvalue;
89 struct meta_value rvalue;
90};
91
92static inline int meta_id(struct meta_value *v)
93{
94 return TCF_META_ID(v->hdr.kind);
95}
96
97static inline int meta_type(struct meta_value *v)
98{
99 return TCF_META_TYPE(v->hdr.kind);
100}
101
102#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
103 struct tcf_pkt_info *info, struct meta_value *v, \
104 struct meta_obj *dst, int *err)
105
106/**************************************************************************
107 * System status & misc
108 **************************************************************************/
109
110META_COLLECTOR(int_random)
111{
112 get_random_bytes(&dst->value, sizeof(dst->value));
113}
114
115static inline unsigned long fixed_loadavg(int load)
116{
117 int rnd_load = load + (FIXED_1/200);
118 int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
119
120 return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
121}
122
123META_COLLECTOR(int_loadavg_0)
124{
125 dst->value = fixed_loadavg(avenrun[0]);
126}
127
128META_COLLECTOR(int_loadavg_1)
129{
130 dst->value = fixed_loadavg(avenrun[1]);
131}
132
133META_COLLECTOR(int_loadavg_2)
134{
135 dst->value = fixed_loadavg(avenrun[2]);
136}
137
138/**************************************************************************
139 * Device names & indices
140 **************************************************************************/
141
142static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
143{
144 if (unlikely(dev == NULL))
145 return -1;
146
147 dst->value = dev->ifindex;
148 return 0;
149}
150
151static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
152{
153 if (unlikely(dev == NULL))
154 return -1;
155
156 dst->value = (unsigned long) dev->name;
157 dst->len = strlen(dev->name);
158 return 0;
159}
160
161META_COLLECTOR(int_dev)
162{
163 *err = int_dev(skb->dev, dst);
164}
165
166META_COLLECTOR(var_dev)
167{
168 *err = var_dev(skb->dev, dst);
169}
170
171/**************************************************************************
172 * vlan tag
173 **************************************************************************/
174
175META_COLLECTOR(int_vlan_tag)
176{
177 unsigned short tag;
178
179 tag = skb_vlan_tag_get(skb);
180 if (!tag && __vlan_get_tag(skb, &tag))
181 *err = -1;
182 else
183 dst->value = tag;
184}
185
186
187
188/**************************************************************************
189 * skb attributes
190 **************************************************************************/
191
192META_COLLECTOR(int_priority)
193{
194 dst->value = skb->priority;
195}
196
197META_COLLECTOR(int_protocol)
198{
199 /* Let userspace take care of the byte ordering */
200 dst->value = tc_skb_protocol(skb);
201}
202
203META_COLLECTOR(int_pkttype)
204{
205 dst->value = skb->pkt_type;
206}
207
208META_COLLECTOR(int_pktlen)
209{
210 dst->value = skb->len;
211}
212
213META_COLLECTOR(int_datalen)
214{
215 dst->value = skb->data_len;
216}
217
218META_COLLECTOR(int_maclen)
219{
220 dst->value = skb->mac_len;
221}
222
223META_COLLECTOR(int_rxhash)
224{
225 dst->value = skb_get_hash(skb);
226}
227
228/**************************************************************************
229 * Netfilter
230 **************************************************************************/
231
232META_COLLECTOR(int_mark)
233{
234 dst->value = skb->mark;
235}
236
237/**************************************************************************
238 * Traffic Control
239 **************************************************************************/
240
241META_COLLECTOR(int_tcindex)
242{
243 dst->value = skb->tc_index;
244}
245
246/**************************************************************************
247 * Routing
248 **************************************************************************/
249
250META_COLLECTOR(int_rtclassid)
251{
252 if (unlikely(skb_dst(skb) == NULL))
253 *err = -1;
254 else
255#ifdef CONFIG_IP_ROUTE_CLASSID
256 dst->value = skb_dst(skb)->tclassid;
257#else
258 dst->value = 0;
259#endif
260}
261
262META_COLLECTOR(int_rtiif)
263{
264 if (unlikely(skb_rtable(skb) == NULL))
265 *err = -1;
266 else
267 dst->value = inet_iif(skb);
268}
269
270/**************************************************************************
271 * Socket Attributes
272 **************************************************************************/
273
274#define skip_nonlocal(skb) \
275 (unlikely(skb->sk == NULL))
276
277META_COLLECTOR(int_sk_family)
278{
279 if (skip_nonlocal(skb)) {
280 *err = -1;
281 return;
282 }
283 dst->value = skb->sk->sk_family;
284}
285
286META_COLLECTOR(int_sk_state)
287{
288 if (skip_nonlocal(skb)) {
289 *err = -1;
290 return;
291 }
292 dst->value = skb->sk->sk_state;
293}
294
295META_COLLECTOR(int_sk_reuse)
296{
297 if (skip_nonlocal(skb)) {
298 *err = -1;
299 return;
300 }
301 dst->value = skb->sk->sk_reuse;
302}
303
304META_COLLECTOR(int_sk_bound_if)
305{
306 if (skip_nonlocal(skb)) {
307 *err = -1;
308 return;
309 }
310 /* No error if bound_dev_if is 0, legal userspace check */
311 dst->value = skb->sk->sk_bound_dev_if;
312}
313
314META_COLLECTOR(var_sk_bound_if)
315{
316 if (skip_nonlocal(skb)) {
317 *err = -1;
318 return;
319 }
320
321 if (skb->sk->sk_bound_dev_if == 0) {
322 dst->value = (unsigned long) "any";
323 dst->len = 3;
324 } else {
325 struct net_device *dev;
326
327 rcu_read_lock();
328 dev = dev_get_by_index_rcu(sock_net(skb->sk),
329 skb->sk->sk_bound_dev_if);
330 *err = var_dev(dev, dst);
331 rcu_read_unlock();
332 }
333}
334
335META_COLLECTOR(int_sk_refcnt)
336{
337 if (skip_nonlocal(skb)) {
338 *err = -1;
339 return;
340 }
341 dst->value = atomic_read(&skb->sk->sk_refcnt);
342}
343
344META_COLLECTOR(int_sk_rcvbuf)
345{
346 const struct sock *sk = skb_to_full_sk(skb);
347
348 if (!sk) {
349 *err = -1;
350 return;
351 }
352 dst->value = sk->sk_rcvbuf;
353}
354
355META_COLLECTOR(int_sk_shutdown)
356{
357 const struct sock *sk = skb_to_full_sk(skb);
358
359 if (!sk) {
360 *err = -1;
361 return;
362 }
363 dst->value = sk->sk_shutdown;
364}
365
366META_COLLECTOR(int_sk_proto)
367{
368 const struct sock *sk = skb_to_full_sk(skb);
369
370 if (!sk) {
371 *err = -1;
372 return;
373 }
374 dst->value = sk->sk_protocol;
375}
376
377META_COLLECTOR(int_sk_type)
378{
379 const struct sock *sk = skb_to_full_sk(skb);
380
381 if (!sk) {
382 *err = -1;
383 return;
384 }
385 dst->value = sk->sk_type;
386}
387
388META_COLLECTOR(int_sk_rmem_alloc)
389{
390 const struct sock *sk = skb_to_full_sk(skb);
391
392 if (!sk) {
393 *err = -1;
394 return;
395 }
396 dst->value = sk_rmem_alloc_get(sk);
397}
398
399META_COLLECTOR(int_sk_wmem_alloc)
400{
401 const struct sock *sk = skb_to_full_sk(skb);
402
403 if (!sk) {
404 *err = -1;
405 return;
406 }
407 dst->value = sk_wmem_alloc_get(sk);
408}
409
410META_COLLECTOR(int_sk_omem_alloc)
411{
412 const struct sock *sk = skb_to_full_sk(skb);
413
414 if (!sk) {
415 *err = -1;
416 return;
417 }
418 dst->value = atomic_read(&sk->sk_omem_alloc);
419}
420
421META_COLLECTOR(int_sk_rcv_qlen)
422{
423 const struct sock *sk = skb_to_full_sk(skb);
424
425 if (!sk) {
426 *err = -1;
427 return;
428 }
429 dst->value = sk->sk_receive_queue.qlen;
430}
431
432META_COLLECTOR(int_sk_snd_qlen)
433{
434 const struct sock *sk = skb_to_full_sk(skb);
435
436 if (!sk) {
437 *err = -1;
438 return;
439 }
440 dst->value = sk->sk_write_queue.qlen;
441}
442
443META_COLLECTOR(int_sk_wmem_queued)
444{
445 const struct sock *sk = skb_to_full_sk(skb);
446
447 if (!sk) {
448 *err = -1;
449 return;
450 }
451 dst->value = sk->sk_wmem_queued;
452}
453
454META_COLLECTOR(int_sk_fwd_alloc)
455{
456 const struct sock *sk = skb_to_full_sk(skb);
457
458 if (!sk) {
459 *err = -1;
460 return;
461 }
462 dst->value = sk->sk_forward_alloc;
463}
464
465META_COLLECTOR(int_sk_sndbuf)
466{
467 const struct sock *sk = skb_to_full_sk(skb);
468
469 if (!sk) {
470 *err = -1;
471 return;
472 }
473 dst->value = sk->sk_sndbuf;
474}
475
476META_COLLECTOR(int_sk_alloc)
477{
478 const struct sock *sk = skb_to_full_sk(skb);
479
480 if (!sk) {
481 *err = -1;
482 return;
483 }
484 dst->value = (__force int) sk->sk_allocation;
485}
486
487META_COLLECTOR(int_sk_hash)
488{
489 if (skip_nonlocal(skb)) {
490 *err = -1;
491 return;
492 }
493 dst->value = skb->sk->sk_hash;
494}
495
496META_COLLECTOR(int_sk_lingertime)
497{
498 const struct sock *sk = skb_to_full_sk(skb);
499
500 if (!sk) {
501 *err = -1;
502 return;
503 }
504 dst->value = sk->sk_lingertime / HZ;
505}
506
507META_COLLECTOR(int_sk_err_qlen)
508{
509 const struct sock *sk = skb_to_full_sk(skb);
510
511 if (!sk) {
512 *err = -1;
513 return;
514 }
515 dst->value = sk->sk_error_queue.qlen;
516}
517
518META_COLLECTOR(int_sk_ack_bl)
519{
520 const struct sock *sk = skb_to_full_sk(skb);
521
522 if (!sk) {
523 *err = -1;
524 return;
525 }
526 dst->value = sk->sk_ack_backlog;
527}
528
529META_COLLECTOR(int_sk_max_ack_bl)
530{
531 const struct sock *sk = skb_to_full_sk(skb);
532
533 if (!sk) {
534 *err = -1;
535 return;
536 }
537 dst->value = sk->sk_max_ack_backlog;
538}
539
540META_COLLECTOR(int_sk_prio)
541{
542 const struct sock *sk = skb_to_full_sk(skb);
543
544 if (!sk) {
545 *err = -1;
546 return;
547 }
548 dst->value = sk->sk_priority;
549}
550
551META_COLLECTOR(int_sk_rcvlowat)
552{
553 const struct sock *sk = skb_to_full_sk(skb);
554
555 if (!sk) {
556 *err = -1;
557 return;
558 }
559 dst->value = sk->sk_rcvlowat;
560}
561
562META_COLLECTOR(int_sk_rcvtimeo)
563{
564 const struct sock *sk = skb_to_full_sk(skb);
565
566 if (!sk) {
567 *err = -1;
568 return;
569 }
570 dst->value = sk->sk_rcvtimeo / HZ;
571}
572
573META_COLLECTOR(int_sk_sndtimeo)
574{
575 const struct sock *sk = skb_to_full_sk(skb);
576
577 if (!sk) {
578 *err = -1;
579 return;
580 }
581 dst->value = sk->sk_sndtimeo / HZ;
582}
583
584META_COLLECTOR(int_sk_sendmsg_off)
585{
586 const struct sock *sk = skb_to_full_sk(skb);
587
588 if (!sk) {
589 *err = -1;
590 return;
591 }
592 dst->value = sk->sk_frag.offset;
593}
594
595META_COLLECTOR(int_sk_write_pend)
596{
597 const struct sock *sk = skb_to_full_sk(skb);
598
599 if (!sk) {
600 *err = -1;
601 return;
602 }
603 dst->value = sk->sk_write_pending;
604}
605
606/**************************************************************************
607 * Meta value collectors assignment table
608 **************************************************************************/
609
610struct meta_ops {
611 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
612 struct meta_value *, struct meta_obj *, int *);
613};
614
615#define META_ID(name) TCF_META_ID_##name
616#define META_FUNC(name) { .get = meta_##name }
617
618/* Meta value operations table listing all meta value collectors and
619 * assigns them to a type and meta id. */
620static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
621 [TCF_META_TYPE_VAR] = {
622 [META_ID(DEV)] = META_FUNC(var_dev),
623 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
624 },
625 [TCF_META_TYPE_INT] = {
626 [META_ID(RANDOM)] = META_FUNC(int_random),
627 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
628 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
629 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
630 [META_ID(DEV)] = META_FUNC(int_dev),
631 [META_ID(PRIORITY)] = META_FUNC(int_priority),
632 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
633 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
634 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
635 [META_ID(DATALEN)] = META_FUNC(int_datalen),
636 [META_ID(MACLEN)] = META_FUNC(int_maclen),
637 [META_ID(NFMARK)] = META_FUNC(int_mark),
638 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
639 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
640 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
641 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
642 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
643 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
644 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
645 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
646 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
647 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
648 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
649 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
650 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
651 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
652 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
653 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
654 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
655 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
656 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
657 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
658 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
659 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
660 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
661 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
662 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
663 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
664 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
665 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
666 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
667 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
668 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
669 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
670 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
671 [META_ID(RXHASH)] = META_FUNC(int_rxhash),
672 }
673};
674
675static inline struct meta_ops *meta_ops(struct meta_value *val)
676{
677 return &__meta_ops[meta_type(val)][meta_id(val)];
678}
679
680/**************************************************************************
681 * Type specific operations for TCF_META_TYPE_VAR
682 **************************************************************************/
683
684static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
685{
686 int r = a->len - b->len;
687
688 if (r == 0)
689 r = memcmp((void *) a->value, (void *) b->value, a->len);
690
691 return r;
692}
693
694static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
695{
696 int len = nla_len(nla);
697
698 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
699 if (dst->val == 0UL)
700 return -ENOMEM;
701 dst->len = len;
702 return 0;
703}
704
705static void meta_var_destroy(struct meta_value *v)
706{
707 kfree((void *) v->val);
708}
709
710static void meta_var_apply_extras(struct meta_value *v,
711 struct meta_obj *dst)
712{
713 int shift = v->hdr.shift;
714
715 if (shift && shift < dst->len)
716 dst->len -= shift;
717}
718
719static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
720{
721 if (v->val && v->len &&
722 nla_put(skb, tlv, v->len, (void *) v->val))
723 goto nla_put_failure;
724 return 0;
725
726nla_put_failure:
727 return -1;
728}
729
730/**************************************************************************
731 * Type specific operations for TCF_META_TYPE_INT
732 **************************************************************************/
733
734static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
735{
736 /* Let gcc optimize it, the unlikely is not really based on
737 * some numbers but jump free code for mismatches seems
738 * more logical. */
739 if (unlikely(a->value == b->value))
740 return 0;
741 else if (a->value < b->value)
742 return -1;
743 else
744 return 1;
745}
746
747static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
748{
749 if (nla_len(nla) >= sizeof(unsigned long)) {
750 dst->val = *(unsigned long *) nla_data(nla);
751 dst->len = sizeof(unsigned long);
752 } else if (nla_len(nla) == sizeof(u32)) {
753 dst->val = nla_get_u32(nla);
754 dst->len = sizeof(u32);
755 } else
756 return -EINVAL;
757
758 return 0;
759}
760
761static void meta_int_apply_extras(struct meta_value *v,
762 struct meta_obj *dst)
763{
764 if (v->hdr.shift)
765 dst->value >>= v->hdr.shift;
766
767 if (v->val)
768 dst->value &= v->val;
769}
770
771static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
772{
773 if (v->len == sizeof(unsigned long)) {
774 if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
775 goto nla_put_failure;
776 } else if (v->len == sizeof(u32)) {
777 if (nla_put_u32(skb, tlv, v->val))
778 goto nla_put_failure;
779 }
780
781 return 0;
782
783nla_put_failure:
784 return -1;
785}
786
787/**************************************************************************
788 * Type specific operations table
789 **************************************************************************/
790
791struct meta_type_ops {
792 void (*destroy)(struct meta_value *);
793 int (*compare)(struct meta_obj *, struct meta_obj *);
794 int (*change)(struct meta_value *, struct nlattr *);
795 void (*apply_extras)(struct meta_value *, struct meta_obj *);
796 int (*dump)(struct sk_buff *, struct meta_value *, int);
797};
798
799static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
800 [TCF_META_TYPE_VAR] = {
801 .destroy = meta_var_destroy,
802 .compare = meta_var_compare,
803 .change = meta_var_change,
804 .apply_extras = meta_var_apply_extras,
805 .dump = meta_var_dump
806 },
807 [TCF_META_TYPE_INT] = {
808 .compare = meta_int_compare,
809 .change = meta_int_change,
810 .apply_extras = meta_int_apply_extras,
811 .dump = meta_int_dump
812 }
813};
814
815static inline struct meta_type_ops *meta_type_ops(struct meta_value *v)
816{
817 return &__meta_type_ops[meta_type(v)];
818}
819
820/**************************************************************************
821 * Core
822 **************************************************************************/
823
824static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
825 struct meta_value *v, struct meta_obj *dst)
826{
827 int err = 0;
828
829 if (meta_id(v) == TCF_META_ID_VALUE) {
830 dst->value = v->val;
831 dst->len = v->len;
832 return 0;
833 }
834
835 meta_ops(v)->get(skb, info, v, dst, &err);
836 if (err < 0)
837 return err;
838
839 if (meta_type_ops(v)->apply_extras)
840 meta_type_ops(v)->apply_extras(v, dst);
841
842 return 0;
843}
844
845static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
846 struct tcf_pkt_info *info)
847{
848 int r;
849 struct meta_match *meta = (struct meta_match *) m->data;
850 struct meta_obj l_value, r_value;
851
852 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
853 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
854 return 0;
855
856 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
857
858 switch (meta->lvalue.hdr.op) {
859 case TCF_EM_OPND_EQ:
860 return !r;
861 case TCF_EM_OPND_LT:
862 return r < 0;
863 case TCF_EM_OPND_GT:
864 return r > 0;
865 }
866
867 return 0;
868}
869
870static void meta_delete(struct meta_match *meta)
871{
872 if (meta) {
873 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
874
875 if (ops && ops->destroy) {
876 ops->destroy(&meta->lvalue);
877 ops->destroy(&meta->rvalue);
878 }
879 }
880
881 kfree(meta);
882}
883
884static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
885{
886 if (nla) {
887 if (nla_len(nla) == 0)
888 return -EINVAL;
889
890 return meta_type_ops(dst)->change(dst, nla);
891 }
892
893 return 0;
894}
895
896static inline int meta_is_supported(struct meta_value *val)
897{
898 return !meta_id(val) || meta_ops(val)->get;
899}
900
901static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
902 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
903};
904
905static int em_meta_change(struct net *net, void *data, int len,
906 struct tcf_ematch *m)
907{
908 int err;
909 struct nlattr *tb[TCA_EM_META_MAX + 1];
910 struct tcf_meta_hdr *hdr;
911 struct meta_match *meta = NULL;
912
913 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
914 if (err < 0)
915 goto errout;
916
917 err = -EINVAL;
918 if (tb[TCA_EM_META_HDR] == NULL)
919 goto errout;
920 hdr = nla_data(tb[TCA_EM_META_HDR]);
921
922 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
923 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
924 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
925 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
926 goto errout;
927
928 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
929 if (meta == NULL) {
930 err = -ENOMEM;
931 goto errout;
932 }
933
934 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
935 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
936
937 if (!meta_is_supported(&meta->lvalue) ||
938 !meta_is_supported(&meta->rvalue)) {
939 err = -EOPNOTSUPP;
940 goto errout;
941 }
942
943 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
944 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
945 goto errout;
946
947 m->datalen = sizeof(*meta);
948 m->data = (unsigned long) meta;
949
950 err = 0;
951errout:
952 if (err && meta)
953 meta_delete(meta);
954 return err;
955}
956
957static void em_meta_destroy(struct tcf_ematch *m)
958{
959 if (m)
960 meta_delete((struct meta_match *) m->data);
961}
962
963static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
964{
965 struct meta_match *meta = (struct meta_match *) em->data;
966 struct tcf_meta_hdr hdr;
967 struct meta_type_ops *ops;
968
969 memset(&hdr, 0, sizeof(hdr));
970 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
971 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
972
973 if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
974 goto nla_put_failure;
975
976 ops = meta_type_ops(&meta->lvalue);
977 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
978 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
979 goto nla_put_failure;
980
981 return 0;
982
983nla_put_failure:
984 return -1;
985}
986
987static struct tcf_ematch_ops em_meta_ops = {
988 .kind = TCF_EM_META,
989 .change = em_meta_change,
990 .match = em_meta_match,
991 .destroy = em_meta_destroy,
992 .dump = em_meta_dump,
993 .owner = THIS_MODULE,
994 .link = LIST_HEAD_INIT(em_meta_ops.link)
995};
996
997static int __init init_em_meta(void)
998{
999 return tcf_em_register(&em_meta_ops);
1000}
1001
1002static void __exit exit_em_meta(void)
1003{
1004 tcf_em_unregister(&em_meta_ops);
1005}
1006
1007MODULE_LICENSE("GPL");
1008
1009module_init(init_em_meta);
1010module_exit(exit_em_meta);
1011
1012MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);