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[linux-2.6-block.git] / net / sched / em_meta.c
CommitLineData
1da177e4
LT		 1/*
2 * net/sched/em_meta.c Metadata ematch
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 *
11 * ==========================================================================
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
1da177e4
LT		 61#include <linux/module.h>
62#include <linux/types.h>
63#include <linux/kernel.h>
64#include <linux/sched.h>
65#include <linux/string.h>
66#include <linux/skbuff.h>
67#include <linux/random.h>
3113e88c 68#include <linux/if_vlan.h>
1da177e4
LT		 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
3113e88c
SH		 173/**************************************************************************
174 * vlan tag
175 **************************************************************************/
176
177META_COLLECTOR(int_vlan_tag)
178{
1a31f204
SH		 179 unsigned short tag;
180
181 tag = vlan_tx_tag_get(skb);
182 if (!tag && __vlan_get_tag(skb, &tag))
3113e88c
SH		 183 *err = -1;
184 else
185 dst->value = tag;
186}
187
188
189
1da177e4
LT		 190/**************************************************************************
191 * skb attributes
192 **************************************************************************/
193
194META_COLLECTOR(int_priority)
195{
196 dst->value = skb->priority;
197}
198
199META_COLLECTOR(int_protocol)
200{
201 /* Let userspace take care of the byte ordering */
202 dst->value = skb->protocol;
203}
204
1da177e4
LT		 205META_COLLECTOR(int_pkttype)
206{
207 dst->value = skb->pkt_type;
208}
209
210META_COLLECTOR(int_pktlen)
211{
212 dst->value = skb->len;
213}
214
215META_COLLECTOR(int_datalen)
216{
217 dst->value = skb->data_len;
218}
219
220META_COLLECTOR(int_maclen)
221{
222 dst->value = skb->mac_len;
223}
224
225/**************************************************************************
226 * Netfilter
227 **************************************************************************/
228
82e91ffe 229META_COLLECTOR(int_mark)
1da177e4 230{
82e91ffe 231 dst->value = skb->mark;
7686ee1a 232}
1da177e4
LT		 233
234/**************************************************************************
235 * Traffic Control
236 **************************************************************************/
237
238META_COLLECTOR(int_tcindex)
239{
240 dst->value = skb->tc_index;
241}
242
1da177e4
LT		 243/**************************************************************************
244 * Routing
245 **************************************************************************/
246
1da177e4
LT		 247META_COLLECTOR(int_rtclassid)
248{
adf30907 249 if (unlikely(skb_dst(skb) == NULL))
1da177e4
LT		 250 *err = -1;
251 else
7686ee1a 252#ifdef CONFIG_NET_CLS_ROUTE
adf30907 253 dst->value = skb_dst(skb)->tclassid;
7686ee1a
PM		 254#else
255 dst->value = 0;
1da177e4 256#endif
7686ee1a 257}
1da177e4
LT		 258
259META_COLLECTOR(int_rtiif)
260{
511c3f92 261 if (unlikely(skb_rtable(skb) == NULL))
1da177e4
LT		 262 *err = -1;
263 else
511c3f92 264 dst->value = skb_rtable(skb)->fl.iif;
1da177e4
LT		 265}
266
48900629
TG		 267/**************************************************************************
268 * Socket Attributes
269 **************************************************************************/
270
271#define SKIP_NONLOCAL(skb) \
272 if (unlikely(skb->sk == NULL)) { \
273 *err = -1; \
274 return; \
275 }
276
277META_COLLECTOR(int_sk_family)
278{
279 SKIP_NONLOCAL(skb);
280 dst->value = skb->sk->sk_family;
281}
282
283META_COLLECTOR(int_sk_state)
284{
285 SKIP_NONLOCAL(skb);
286 dst->value = skb->sk->sk_state;
287}
288
289META_COLLECTOR(int_sk_reuse)
290{
291 SKIP_NONLOCAL(skb);
292 dst->value = skb->sk->sk_reuse;
293}
294
295META_COLLECTOR(int_sk_bound_if)
296{
297 SKIP_NONLOCAL(skb);
298 /* No error if bound_dev_if is 0, legal userspace check */
299 dst->value = skb->sk->sk_bound_dev_if;
300}
301
302META_COLLECTOR(var_sk_bound_if)
303{
304 SKIP_NONLOCAL(skb);
305
d0075634 306 if (skb->sk->sk_bound_dev_if == 0) {
48900629
TG		 307 dst->value = (unsigned long) "any";
308 dst->len = 3;
d0075634 309 } else {
48900629 310 struct net_device *dev;
10297b99 311
d0075634 312 rcu_read_lock();
2939e275
ED		 313 dev = dev_get_by_index_rcu(sock_net(skb->sk),
314 skb->sk->sk_bound_dev_if);
48900629 315 *err = var_dev(dev, dst);
d0075634
ED		 316 rcu_read_unlock();
317 }
48900629
TG		 318}
319
320META_COLLECTOR(int_sk_refcnt)
321{
322 SKIP_NONLOCAL(skb);
323 dst->value = atomic_read(&skb->sk->sk_refcnt);
324}
325
326META_COLLECTOR(int_sk_rcvbuf)
327{
328 SKIP_NONLOCAL(skb);
329 dst->value = skb->sk->sk_rcvbuf;
330}
331
332META_COLLECTOR(int_sk_shutdown)
333{
334 SKIP_NONLOCAL(skb);
335 dst->value = skb->sk->sk_shutdown;
336}
337
338META_COLLECTOR(int_sk_proto)
339{
340 SKIP_NONLOCAL(skb);
341 dst->value = skb->sk->sk_protocol;
342}
343
344META_COLLECTOR(int_sk_type)
345{
346 SKIP_NONLOCAL(skb);
347 dst->value = skb->sk->sk_type;
348}
349
350META_COLLECTOR(int_sk_rmem_alloc)
351{
352 SKIP_NONLOCAL(skb);
31e6d363 353 dst->value = sk_rmem_alloc_get(skb->sk);
48900629
TG		 354}
355
356META_COLLECTOR(int_sk_wmem_alloc)
357{
358 SKIP_NONLOCAL(skb);
31e6d363 359 dst->value = sk_wmem_alloc_get(skb->sk);
48900629
TG		 360}
361
362META_COLLECTOR(int_sk_omem_alloc)
363{
364 SKIP_NONLOCAL(skb);
365 dst->value = atomic_read(&skb->sk->sk_omem_alloc);
366}
367
368META_COLLECTOR(int_sk_rcv_qlen)
369{
370 SKIP_NONLOCAL(skb);
371 dst->value = skb->sk->sk_receive_queue.qlen;
372}
373
374META_COLLECTOR(int_sk_snd_qlen)
375{
376 SKIP_NONLOCAL(skb);
377 dst->value = skb->sk->sk_write_queue.qlen;
378}
379
380META_COLLECTOR(int_sk_wmem_queued)
381{
382 SKIP_NONLOCAL(skb);
383 dst->value = skb->sk->sk_wmem_queued;
384}
385
386META_COLLECTOR(int_sk_fwd_alloc)
387{
388 SKIP_NONLOCAL(skb);
389 dst->value = skb->sk->sk_forward_alloc;
390}
391
392META_COLLECTOR(int_sk_sndbuf)
393{
394 SKIP_NONLOCAL(skb);
395 dst->value = skb->sk->sk_sndbuf;
396}
397
398META_COLLECTOR(int_sk_alloc)
399{
400 SKIP_NONLOCAL(skb);
401 dst->value = skb->sk->sk_allocation;
402}
403
404META_COLLECTOR(int_sk_route_caps)
405{
406 SKIP_NONLOCAL(skb);
407 dst->value = skb->sk->sk_route_caps;
408}
409
81c3d547 410META_COLLECTOR(int_sk_hash)
48900629
TG		 411{
412 SKIP_NONLOCAL(skb);
81c3d547 413 dst->value = skb->sk->sk_hash;
48900629
TG		 414}
415
416META_COLLECTOR(int_sk_lingertime)
417{
418 SKIP_NONLOCAL(skb);
419 dst->value = skb->sk->sk_lingertime / HZ;
420}
421
422META_COLLECTOR(int_sk_err_qlen)
423{
424 SKIP_NONLOCAL(skb);
425 dst->value = skb->sk->sk_error_queue.qlen;
426}
427
428META_COLLECTOR(int_sk_ack_bl)
429{
430 SKIP_NONLOCAL(skb);
431 dst->value = skb->sk->sk_ack_backlog;
432}
433
434META_COLLECTOR(int_sk_max_ack_bl)
435{
436 SKIP_NONLOCAL(skb);
437 dst->value = skb->sk->sk_max_ack_backlog;
438}
439
440META_COLLECTOR(int_sk_prio)
441{
442 SKIP_NONLOCAL(skb);
443 dst->value = skb->sk->sk_priority;
444}
445
446META_COLLECTOR(int_sk_rcvlowat)
447{
448 SKIP_NONLOCAL(skb);
449 dst->value = skb->sk->sk_rcvlowat;
450}
451
452META_COLLECTOR(int_sk_rcvtimeo)
453{
454 SKIP_NONLOCAL(skb);
455 dst->value = skb->sk->sk_rcvtimeo / HZ;
456}
457
458META_COLLECTOR(int_sk_sndtimeo)
459{
460 SKIP_NONLOCAL(skb);
461 dst->value = skb->sk->sk_sndtimeo / HZ;
462}
463
464META_COLLECTOR(int_sk_sendmsg_off)
465{
466 SKIP_NONLOCAL(skb);
467 dst->value = skb->sk->sk_sndmsg_off;
468}
469
470META_COLLECTOR(int_sk_write_pend)
471{
472 SKIP_NONLOCAL(skb);
473 dst->value = skb->sk->sk_write_pending;
474}
475
1da177e4
LT		 476/**************************************************************************
477 * Meta value collectors assignment table
478 **************************************************************************/
479
480struct meta_ops
481{
482 void (*get)(struct sk_buff *, struct tcf_pkt_info *,
483 struct meta_value *, struct meta_obj *, int *);
484};
485
48900629
TG		 486#define META_ID(name) TCF_META_ID_##name
487#define META_FUNC(name) { .get = meta_##name }
488
1da177e4
LT		 489/* Meta value operations table listing all meta value collectors and
490 * assigns them to a type and meta id. */
491static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
492 [TCF_META_TYPE_VAR] = {
48900629 493 [META_ID(DEV)] = META_FUNC(var_dev),
48900629 494 [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if),
1da177e4
LT		 495 },
496 [TCF_META_TYPE_INT] = {
48900629
TG		 497 [META_ID(RANDOM)] = META_FUNC(int_random),
498 [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0),
499 [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1),
500 [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2),
501 [META_ID(DEV)] = META_FUNC(int_dev),
48900629
TG		 502 [META_ID(PRIORITY)] = META_FUNC(int_priority),
503 [META_ID(PROTOCOL)] = META_FUNC(int_protocol),
48900629
TG		 504 [META_ID(PKTTYPE)] = META_FUNC(int_pkttype),
505 [META_ID(PKTLEN)] = META_FUNC(int_pktlen),
506 [META_ID(DATALEN)] = META_FUNC(int_datalen),
507 [META_ID(MACLEN)] = META_FUNC(int_maclen),
82e91ffe 508 [META_ID(NFMARK)] = META_FUNC(int_mark),
48900629 509 [META_ID(TCINDEX)] = META_FUNC(int_tcindex),
48900629 510 [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid),
48900629
TG		 511 [META_ID(RTIIF)] = META_FUNC(int_rtiif),
512 [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family),
513 [META_ID(SK_STATE)] = META_FUNC(int_sk_state),
514 [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse),
515 [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if),
516 [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt),
517 [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf),
518 [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf),
519 [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown),
520 [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto),
521 [META_ID(SK_TYPE)] = META_FUNC(int_sk_type),
522 [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc),
523 [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc),
524 [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc),
525 [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued),
526 [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen),
527 [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen),
528 [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen),
529 [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc),
530 [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc),
531 [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps),
81c3d547 532 [META_ID(SK_HASH)] = META_FUNC(int_sk_hash),
48900629
TG		 533 [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime),
534 [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl),
535 [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl),
536 [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio),
537 [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat),
538 [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo),
539 [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo),
540 [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off),
541 [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend),
3113e88c 542 [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag),
1da177e4
LT		 543 }
544};
545
546static inline struct meta_ops * meta_ops(struct meta_value *val)
547{
548 return &__meta_ops[meta_type(val)][meta_id(val)];
549}
550
551/**************************************************************************
552 * Type specific operations for TCF_META_TYPE_VAR
553 **************************************************************************/
554
555static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
556{
557 int r = a->len - b->len;
558
559 if (r == 0)
560 r = memcmp((void *) a->value, (void *) b->value, a->len);
561
562 return r;
563}
564
add93b61 565static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 566{
add93b61 567 int len = nla_len(nla);
1da177e4 568
add93b61 569 dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
1da177e4
LT		 570 if (dst->val == 0UL)
571 return -ENOMEM;
1da177e4
LT		 572 dst->len = len;
573 return 0;
574}
575
576static void meta_var_destroy(struct meta_value *v)
577{
a51482bd 578 kfree((void *) v->val);
1da177e4
LT		 579}
580
581static void meta_var_apply_extras(struct meta_value *v,
582 struct meta_obj *dst)
583{
584 int shift = v->hdr.shift;
585
586 if (shift && shift < dst->len)
587 dst->len -= shift;
588}
589
590static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
591{
592 if (v->val && v->len)
add93b61 593 NLA_PUT(skb, tlv, v->len, (void *) v->val);
1da177e4
LT		 594 return 0;
595
add93b61 596nla_put_failure:
1da177e4
LT		 597 return -1;
598}
599
600/**************************************************************************
601 * Type specific operations for TCF_META_TYPE_INT
602 **************************************************************************/
603
604static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
605{
606 /* Let gcc optimize it, the unlikely is not really based on
607 * some numbers but jump free code for mismatches seems
608 * more logical. */
98e56405 609 if (unlikely(a->value == b->value))
1da177e4 610 return 0;
98e56405 611 else if (a->value < b->value)
1da177e4
LT		 612 return -1;
613 else
614 return 1;
615}
616
add93b61 617static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
1da177e4 618{
add93b61
PM		 619 if (nla_len(nla) >= sizeof(unsigned long)) {
620 dst->val = *(unsigned long *) nla_data(nla);
1da177e4 621 dst->len = sizeof(unsigned long);
add93b61 622 } else if (nla_len(nla) == sizeof(u32)) {
1587bac4 623 dst->val = nla_get_u32(nla);
1da177e4
LT		 624 dst->len = sizeof(u32);
625 } else
626 return -EINVAL;
627
628 return 0;
629}
630
631static void meta_int_apply_extras(struct meta_value *v,
632 struct meta_obj *dst)
633{
634 if (v->hdr.shift)
635 dst->value >>= v->hdr.shift;
636
637 if (v->val)
638 dst->value &= v->val;
639}
640
641static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
642{
643 if (v->len == sizeof(unsigned long))
add93b61 644 NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val);
1da177e4 645 else if (v->len == sizeof(u32)) {
24beeab5 646 NLA_PUT_U32(skb, tlv, v->val);
1da177e4
LT		 647 }
648
649 return 0;
650
add93b61 651nla_put_failure:
1da177e4
LT		 652 return -1;
653}
654
655/**************************************************************************
656 * Type specific operations table
657 **************************************************************************/
658
659struct meta_type_ops
660{
661 void (*destroy)(struct meta_value *);
662 int (*compare)(struct meta_obj *, struct meta_obj *);
add93b61 663 int (*change)(struct meta_value *, struct nlattr *);
1da177e4
LT		 664 void (*apply_extras)(struct meta_value *, struct meta_obj *);
665 int (*dump)(struct sk_buff *, struct meta_value *, int);
666};
667
668static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = {
669 [TCF_META_TYPE_VAR] = {
670 .destroy = meta_var_destroy,
671 .compare = meta_var_compare,
672 .change = meta_var_change,
673 .apply_extras = meta_var_apply_extras,
674 .dump = meta_var_dump
675 },
676 [TCF_META_TYPE_INT] = {
677 .compare = meta_int_compare,
678 .change = meta_int_change,
679 .apply_extras = meta_int_apply_extras,
680 .dump = meta_int_dump
681 }
682};
683
684static inline struct meta_type_ops * meta_type_ops(struct meta_value *v)
685{
686 return &__meta_type_ops[meta_type(v)];
687}
688
689/**************************************************************************
690 * Core
691 **************************************************************************/
692
ed7af3b3
SH		 693static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
694 struct meta_value *v, struct meta_obj *dst)
1da177e4
LT		 695{
696 int err = 0;
697
698 if (meta_id(v) == TCF_META_ID_VALUE) {
699 dst->value = v->val;
700 dst->len = v->len;
701 return 0;
702 }
703
704 meta_ops(v)->get(skb, info, v, dst, &err);
705 if (err < 0)
706 return err;
707
708 if (meta_type_ops(v)->apply_extras)
709 meta_type_ops(v)->apply_extras(v, dst);
710
711 return 0;
712}
713
714static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
715 struct tcf_pkt_info *info)
716{
717 int r;
718 struct meta_match *meta = (struct meta_match *) m->data;
719 struct meta_obj l_value, r_value;
720
721 if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
722 meta_get(skb, info, &meta->rvalue, &r_value) < 0)
723 return 0;
724
725 r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
726
727 switch (meta->lvalue.hdr.op) {
728 case TCF_EM_OPND_EQ:
729 return !r;
730 case TCF_EM_OPND_LT:
731 return r < 0;
732 case TCF_EM_OPND_GT:
733 return r > 0;
734 }
735
736 return 0;
737}
738
ed7af3b3 739static void meta_delete(struct meta_match *meta)
1da177e4 740{
04f217ac
SH		 741 if (meta) {
742 struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
1da177e4 743
04f217ac
SH		 744 if (ops && ops->destroy) {
745 ops->destroy(&meta->lvalue);
746 ops->destroy(&meta->rvalue);
747 }
1da177e4
LT		 748 }
749
750 kfree(meta);
751}
752
add93b61 753static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
1da177e4 754{
add93b61
PM		 755 if (nla) {
756 if (nla_len(nla) == 0)
1da177e4
LT		 757 return -EINVAL;
758
add93b61 759 return meta_type_ops(dst)->change(dst, nla);
1da177e4
LT		 760 }
761
762 return 0;
763}
764
765static inline int meta_is_supported(struct meta_value *val)
766{
767 return (!meta_id(val) || meta_ops(val)->get);
768}
769
7a9c1bd4
PM		 770static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
771 [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) },
772};
773
1da177e4
LT		 774static int em_meta_change(struct tcf_proto *tp, void *data, int len,
775 struct tcf_ematch *m)
776{
cee63723 777 int err;
add93b61 778 struct nlattr *tb[TCA_EM_META_MAX + 1];
1da177e4
LT		 779 struct tcf_meta_hdr *hdr;
780 struct meta_match *meta = NULL;
10297b99 781
7a9c1bd4 782 err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy);
cee63723 783 if (err < 0)
1da177e4
LT		 784 goto errout;
785
cee63723 786 err = -EINVAL;
7a9c1bd4 787 if (tb[TCA_EM_META_HDR] == NULL)
1da177e4 788 goto errout;
add93b61 789 hdr = nla_data(tb[TCA_EM_META_HDR]);
1da177e4
LT		 790
791 if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
792 TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
793 TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
794 TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
795 goto errout;
796
0da974f4 797 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1da177e4
LT		 798 if (meta == NULL)
799 goto errout;
1da177e4
LT		 800
801 memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
802 memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
803
804 if (!meta_is_supported(&meta->lvalue) ||
805 !meta_is_supported(&meta->rvalue)) {
806 err = -EOPNOTSUPP;
807 goto errout;
808 }
809
add93b61
PM		 810 if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
811 meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
1da177e4
LT		 812 goto errout;
813
814 m->datalen = sizeof(*meta);
815 m->data = (unsigned long) meta;
816
817 err = 0;
818errout:
819 if (err && meta)
820 meta_delete(meta);
821 return err;
822}
823
824static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
825{
826 if (m)
827 meta_delete((struct meta_match *) m->data);
828}
829
830static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
831{
832 struct meta_match *meta = (struct meta_match *) em->data;
833 struct tcf_meta_hdr hdr;
834 struct meta_type_ops *ops;
835
836 memset(&hdr, 0, sizeof(hdr));
837 memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
838 memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
839
add93b61 840 NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr);
1da177e4
LT		 841
842 ops = meta_type_ops(&meta->lvalue);
843 if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
844 ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
add93b61 845 goto nla_put_failure;
1da177e4
LT		 846
847 return 0;
848
add93b61 849nla_put_failure:
1da177e4 850 return -1;
10297b99 851}
1da177e4
LT		 852
853static struct tcf_ematch_ops em_meta_ops = {
854 .kind = TCF_EM_META,
855 .change = em_meta_change,
856 .match = em_meta_match,
857 .destroy = em_meta_destroy,
858 .dump = em_meta_dump,
859 .owner = THIS_MODULE,
860 .link = LIST_HEAD_INIT(em_meta_ops.link)
861};
862
863static int __init init_em_meta(void)
864{
865 return tcf_em_register(&em_meta_ops);
866}
867
10297b99 868static void __exit exit_em_meta(void)
1da177e4
LT		 869{
870 tcf_em_unregister(&em_meta_ops);
871}
872
873MODULE_LICENSE("GPL");
874
875module_init(init_em_meta);
876module_exit(exit_em_meta);
db3d99c0
PM		 877
878MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);
Linux 6.x block layer and io_uring tree(s)