Root/
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 | |
76 | struct meta_obj { |
77 | unsigned long value; |
78 | unsigned int len; |
79 | }; |
80 | |
81 | struct meta_value { |
82 | struct tcf_meta_val hdr; |
83 | unsigned long val; |
84 | unsigned int len; |
85 | }; |
86 | |
87 | struct meta_match { |
88 | struct meta_value lvalue; |
89 | struct meta_value rvalue; |
90 | }; |
91 | |
92 | static inline int meta_id(struct meta_value *v) |
93 | { |
94 | return TCF_META_ID(v->hdr.kind); |
95 | } |
96 | |
97 | static 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 | |
110 | META_COLLECTOR(int_random) |
111 | { |
112 | get_random_bytes(&dst->value, sizeof(dst->value)); |
113 | } |
114 | |
115 | static 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 | |
123 | META_COLLECTOR(int_loadavg_0) |
124 | { |
125 | dst->value = fixed_loadavg(avenrun[0]); |
126 | } |
127 | |
128 | META_COLLECTOR(int_loadavg_1) |
129 | { |
130 | dst->value = fixed_loadavg(avenrun[1]); |
131 | } |
132 | |
133 | META_COLLECTOR(int_loadavg_2) |
134 | { |
135 | dst->value = fixed_loadavg(avenrun[2]); |
136 | } |
137 | |
138 | /************************************************************************** |
139 | * Device names & indices |
140 | **************************************************************************/ |
141 | |
142 | static 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 | |
151 | static 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 | |
161 | META_COLLECTOR(int_dev) |
162 | { |
163 | *err = int_dev(skb->dev, dst); |
164 | } |
165 | |
166 | META_COLLECTOR(var_dev) |
167 | { |
168 | *err = var_dev(skb->dev, dst); |
169 | } |
170 | |
171 | /************************************************************************** |
172 | * vlan tag |
173 | **************************************************************************/ |
174 | |
175 | META_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 | |
192 | META_COLLECTOR(int_priority) |
193 | { |
194 | dst->value = skb->priority; |
195 | } |
196 | |
197 | META_COLLECTOR(int_protocol) |
198 | { |
199 | /* Let userspace take care of the byte ordering */ |
200 | dst->value = skb->protocol; |
201 | } |
202 | |
203 | META_COLLECTOR(int_pkttype) |
204 | { |
205 | dst->value = skb->pkt_type; |
206 | } |
207 | |
208 | META_COLLECTOR(int_pktlen) |
209 | { |
210 | dst->value = skb->len; |
211 | } |
212 | |
213 | META_COLLECTOR(int_datalen) |
214 | { |
215 | dst->value = skb->data_len; |
216 | } |
217 | |
218 | META_COLLECTOR(int_maclen) |
219 | { |
220 | dst->value = skb->mac_len; |
221 | } |
222 | |
223 | META_COLLECTOR(int_rxhash) |
224 | { |
225 | dst->value = skb_get_hash(skb); |
226 | } |
227 | |
228 | /************************************************************************** |
229 | * Netfilter |
230 | **************************************************************************/ |
231 | |
232 | META_COLLECTOR(int_mark) |
233 | { |
234 | dst->value = skb->mark; |
235 | } |
236 | |
237 | /************************************************************************** |
238 | * Traffic Control |
239 | **************************************************************************/ |
240 | |
241 | META_COLLECTOR(int_tcindex) |
242 | { |
243 | dst->value = skb->tc_index; |
244 | } |
245 | |
246 | /************************************************************************** |
247 | * Routing |
248 | **************************************************************************/ |
249 | |
250 | META_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 | |
262 | META_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 | |
277 | META_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 | |
286 | META_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 | |
295 | META_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 | |
304 | META_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 | |
314 | META_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 | |
335 | META_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 | |
344 | META_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 | |
353 | META_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 | |
362 | META_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 | |
371 | META_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 | |
380 | META_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 | |
389 | META_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 | |
398 | META_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 | |
407 | META_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 | |
416 | META_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 | |
425 | META_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 | |
434 | META_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 | |
443 | META_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 | |
452 | META_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 | |
461 | META_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 | |
470 | META_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 | |
479 | META_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 | |
488 | META_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 | |
497 | META_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 | |
506 | META_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 | |
515 | META_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 | |
524 | META_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 | |
533 | META_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 | |
542 | META_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 | |
551 | META_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 | |
564 | struct 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. */ |
574 | static 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 | |
629 | static 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 | |
638 | static 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 | |
648 | static 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 | |
659 | static void meta_var_destroy(struct meta_value *v) |
660 | { |
661 | kfree((void *) v->val); |
662 | } |
663 | |
664 | static 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 | |
673 | static 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 | |
680 | nla_put_failure: |
681 | return -1; |
682 | } |
683 | |
684 | /************************************************************************** |
685 | * Type specific operations for TCF_META_TYPE_INT |
686 | **************************************************************************/ |
687 | |
688 | static 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 | |
701 | static 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 | |
715 | static 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 | |
725 | static 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 | |
737 | nla_put_failure: |
738 | return -1; |
739 | } |
740 | |
741 | /************************************************************************** |
742 | * Type specific operations table |
743 | **************************************************************************/ |
744 | |
745 | struct 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 | |
753 | static 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 | |
769 | static 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 | |
778 | static 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 | |
799 | static 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 | |
824 | static 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 | |
838 | static 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 | |
850 | static inline int meta_is_supported(struct meta_value *val) |
851 | { |
852 | return !meta_id(val) || meta_ops(val)->get; |
853 | } |
854 | |
855 | static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = { |
856 | [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) }, |
857 | }; |
858 | |
859 | static 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; |
905 | errout: |
906 | if (err && meta) |
907 | meta_delete(meta); |
908 | return err; |
909 | } |
910 | |
911 | static 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 | |
917 | static 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 | |
937 | nla_put_failure: |
938 | return -1; |
939 | } |
940 | |
941 | static 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 | |
951 | static int __init init_em_meta(void) |
952 | { |
953 | return tcf_em_register(&em_meta_ops); |
954 | } |
955 | |
956 | static void __exit exit_em_meta(void) |
957 | { |
958 | tcf_em_unregister(&em_meta_ops); |
959 | } |
960 | |
961 | MODULE_LICENSE("GPL"); |
962 | |
963 | module_init(init_em_meta); |
964 | module_exit(exit_em_meta); |
965 | |
966 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |
967 |
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