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1da177e4 LT |
1 | /* |
2 | * net/sched/em_meta.c Metadata ematch | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Thomas Graf <tgraf@suug.ch> | |
10 | * | |
11 | * ========================================================================== | |
10297b99 | 12 | * |
1da177e4 LT |
13 | * The metadata ematch compares two meta objects where each object |
14 | * represents either a meta value stored in the kernel or a static | |
15 | * value provided by userspace. The objects are not provided by | |
16 | * userspace itself but rather a definition providing the information | |
17 | * to build them. Every object is of a certain type which must be | |
18 | * equal to the object it is being compared to. | |
19 | * | |
20 | * The definition of a objects conists of the type (meta type), a | |
21 | * identifier (meta id) and additional type specific information. | |
22 | * The meta id is either TCF_META_TYPE_VALUE for values provided by | |
23 | * userspace or a index to the meta operations table consisting of | |
24 | * function pointers to type specific meta data collectors returning | |
25 | * the value of the requested meta value. | |
26 | * | |
27 | * lvalue rvalue | |
28 | * +-----------+ +-----------+ | |
29 | * | type: INT | | type: INT | | |
261688d0 | 30 | * def | id: DEV | | id: VALUE | |
1da177e4 LT |
31 | * | data: | | data: 3 | |
32 | * +-----------+ +-----------+ | |
33 | * | | | |
261688d0 | 34 | * ---> meta_ops[INT][DEV](...) | |
48900629 | 35 | * | | |
1da177e4 LT |
36 | * ----------- | |
37 | * V V | |
38 | * +-----------+ +-----------+ | |
39 | * | type: INT | | type: INT | | |
261688d0 | 40 | * obj | id: DEV | | id: VALUE | |
1da177e4 LT |
41 | * | data: 2 |<--data got filled out | data: 3 | |
42 | * +-----------+ +-----------+ | |
43 | * | | | |
44 | * --------------> 2 equals 3 <-------------- | |
45 | * | |
46 | * This is a simplified schema, the complexity varies depending | |
47 | * on the meta type. Obviously, the length of the data must also | |
48 | * be provided for non-numeric types. | |
49 | * | |
25985edc | 50 | * Additionally, type dependent modifiers such as shift operators |
1da177e4 LT |
51 | * or mask may be applied to extend the functionaliy. As of now, |
52 | * the variable length type supports shifting the byte string to | |
53 | * the right, eating up any number of octets and thus supporting | |
54 | * wildcard interface name comparisons such as "ppp%" matching | |
55 | * ppp0..9. | |
56 | * | |
57 | * NOTE: Certain meta values depend on other subsystems and are | |
3a4fa0a2 | 58 | * only available if that subsystem is enabled in the kernel. |
1da177e4 LT |
59 | */ |
60 | ||
5a0e3ad6 | 61 | #include <linux/slab.h> |
1da177e4 LT |
62 | #include <linux/module.h> |
63 | #include <linux/types.h> | |
64 | #include <linux/kernel.h> | |
65 | #include <linux/sched.h> | |
66 | #include <linux/string.h> | |
67 | #include <linux/skbuff.h> | |
68 | #include <linux/random.h> | |
3113e88c | 69 | #include <linux/if_vlan.h> |
1da177e4 LT |
70 | #include <linux/tc_ematch/tc_em_meta.h> |
71 | #include <net/dst.h> | |
72 | #include <net/route.h> | |
73 | #include <net/pkt_cls.h> | |
48900629 | 74 | #include <net/sock.h> |
1da177e4 | 75 | |
cc7ec456 | 76 | struct meta_obj { |
1da177e4 LT |
77 | unsigned long value; |
78 | unsigned int len; | |
79 | }; | |
80 | ||
cc7ec456 | 81 | struct meta_value { |
1da177e4 LT |
82 | struct tcf_meta_val hdr; |
83 | unsigned long val; | |
84 | unsigned int len; | |
85 | }; | |
86 | ||
cc7ec456 | 87 | struct meta_match { |
1da177e4 LT |
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 | ||
3113e88c SH |
171 | /************************************************************************** |
172 | * vlan tag | |
173 | **************************************************************************/ | |
174 | ||
175 | META_COLLECTOR(int_vlan_tag) | |
176 | { | |
1a31f204 SH |
177 | unsigned short tag; |
178 | ||
179 | tag = vlan_tx_tag_get(skb); | |
180 | if (!tag && __vlan_get_tag(skb, &tag)) | |
3113e88c SH |
181 | *err = -1; |
182 | else | |
183 | dst->value = tag; | |
184 | } | |
185 | ||
186 | ||
187 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
c2e3143e SH |
223 | META_COLLECTOR(int_rxhash) |
224 | { | |
3958afa1 | 225 | dst->value = skb_get_hash(skb); |
c2e3143e SH |
226 | } |
227 | ||
1da177e4 LT |
228 | /************************************************************************** |
229 | * Netfilter | |
230 | **************************************************************************/ | |
231 | ||
82e91ffe | 232 | META_COLLECTOR(int_mark) |
1da177e4 | 233 | { |
82e91ffe | 234 | dst->value = skb->mark; |
7686ee1a | 235 | } |
1da177e4 LT |
236 | |
237 | /************************************************************************** | |
238 | * Traffic Control | |
239 | **************************************************************************/ | |
240 | ||
241 | META_COLLECTOR(int_tcindex) | |
242 | { | |
243 | dst->value = skb->tc_index; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | /************************************************************************** |
247 | * Routing | |
248 | **************************************************************************/ | |
249 | ||
1da177e4 LT |
250 | META_COLLECTOR(int_rtclassid) |
251 | { | |
adf30907 | 252 | if (unlikely(skb_dst(skb) == NULL)) |
1da177e4 LT |
253 | *err = -1; |
254 | else | |
c7066f70 | 255 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 | 256 | dst->value = skb_dst(skb)->tclassid; |
7686ee1a PM |
257 | #else |
258 | dst->value = 0; | |
1da177e4 | 259 | #endif |
7686ee1a | 260 | } |
1da177e4 LT |
261 | |
262 | META_COLLECTOR(int_rtiif) | |
263 | { | |
511c3f92 | 264 | if (unlikely(skb_rtable(skb) == NULL)) |
1da177e4 LT |
265 | *err = -1; |
266 | else | |
92101b3b | 267 | dst->value = inet_iif(skb); |
1da177e4 LT |
268 | } |
269 | ||
48900629 TG |
270 | /************************************************************************** |
271 | * Socket Attributes | |
272 | **************************************************************************/ | |
273 | ||
4f8f61eb YY |
274 | #define skip_nonlocal(skb) \ |
275 | (unlikely(skb->sk == NULL)) | |
48900629 TG |
276 | |
277 | META_COLLECTOR(int_sk_family) | |
278 | { | |
4f8f61eb YY |
279 | if (skip_nonlocal(skb)) { |
280 | *err = -1; | |
281 | return; | |
282 | } | |
48900629 TG |
283 | dst->value = skb->sk->sk_family; |
284 | } | |
285 | ||
286 | META_COLLECTOR(int_sk_state) | |
287 | { | |
4f8f61eb YY |
288 | if (skip_nonlocal(skb)) { |
289 | *err = -1; | |
290 | return; | |
291 | } | |
48900629 TG |
292 | dst->value = skb->sk->sk_state; |
293 | } | |
294 | ||
295 | META_COLLECTOR(int_sk_reuse) | |
296 | { | |
4f8f61eb YY |
297 | if (skip_nonlocal(skb)) { |
298 | *err = -1; | |
299 | return; | |
300 | } | |
48900629 TG |
301 | dst->value = skb->sk->sk_reuse; |
302 | } | |
303 | ||
304 | META_COLLECTOR(int_sk_bound_if) | |
305 | { | |
4f8f61eb YY |
306 | if (skip_nonlocal(skb)) { |
307 | *err = -1; | |
308 | return; | |
309 | } | |
48900629 TG |
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 | { | |
4f8f61eb YY |
316 | if (skip_nonlocal(skb)) { |
317 | *err = -1; | |
318 | return; | |
319 | } | |
48900629 | 320 | |
d0075634 | 321 | if (skb->sk->sk_bound_dev_if == 0) { |
48900629 TG |
322 | dst->value = (unsigned long) "any"; |
323 | dst->len = 3; | |
d0075634 | 324 | } else { |
48900629 | 325 | struct net_device *dev; |
10297b99 | 326 | |
d0075634 | 327 | rcu_read_lock(); |
2939e275 ED |
328 | dev = dev_get_by_index_rcu(sock_net(skb->sk), |
329 | skb->sk->sk_bound_dev_if); | |
48900629 | 330 | *err = var_dev(dev, dst); |
d0075634 ED |
331 | rcu_read_unlock(); |
332 | } | |
48900629 TG |
333 | } |
334 | ||
335 | META_COLLECTOR(int_sk_refcnt) | |
336 | { | |
4f8f61eb YY |
337 | if (skip_nonlocal(skb)) { |
338 | *err = -1; | |
339 | return; | |
340 | } | |
48900629 TG |
341 | dst->value = atomic_read(&skb->sk->sk_refcnt); |
342 | } | |
343 | ||
344 | META_COLLECTOR(int_sk_rcvbuf) | |
345 | { | |
4f8f61eb YY |
346 | if (skip_nonlocal(skb)) { |
347 | *err = -1; | |
348 | return; | |
349 | } | |
48900629 TG |
350 | dst->value = skb->sk->sk_rcvbuf; |
351 | } | |
352 | ||
353 | META_COLLECTOR(int_sk_shutdown) | |
354 | { | |
4f8f61eb YY |
355 | if (skip_nonlocal(skb)) { |
356 | *err = -1; | |
357 | return; | |
358 | } | |
48900629 TG |
359 | dst->value = skb->sk->sk_shutdown; |
360 | } | |
361 | ||
362 | META_COLLECTOR(int_sk_proto) | |
363 | { | |
4f8f61eb YY |
364 | if (skip_nonlocal(skb)) { |
365 | *err = -1; | |
366 | return; | |
367 | } | |
48900629 TG |
368 | dst->value = skb->sk->sk_protocol; |
369 | } | |
370 | ||
371 | META_COLLECTOR(int_sk_type) | |
372 | { | |
4f8f61eb YY |
373 | if (skip_nonlocal(skb)) { |
374 | *err = -1; | |
375 | return; | |
376 | } | |
48900629 TG |
377 | dst->value = skb->sk->sk_type; |
378 | } | |
379 | ||
380 | META_COLLECTOR(int_sk_rmem_alloc) | |
381 | { | |
4f8f61eb YY |
382 | if (skip_nonlocal(skb)) { |
383 | *err = -1; | |
384 | return; | |
385 | } | |
31e6d363 | 386 | dst->value = sk_rmem_alloc_get(skb->sk); |
48900629 TG |
387 | } |
388 | ||
389 | META_COLLECTOR(int_sk_wmem_alloc) | |
390 | { | |
4f8f61eb YY |
391 | if (skip_nonlocal(skb)) { |
392 | *err = -1; | |
393 | return; | |
394 | } | |
31e6d363 | 395 | dst->value = sk_wmem_alloc_get(skb->sk); |
48900629 TG |
396 | } |
397 | ||
398 | META_COLLECTOR(int_sk_omem_alloc) | |
399 | { | |
4f8f61eb YY |
400 | if (skip_nonlocal(skb)) { |
401 | *err = -1; | |
402 | return; | |
403 | } | |
48900629 TG |
404 | dst->value = atomic_read(&skb->sk->sk_omem_alloc); |
405 | } | |
406 | ||
407 | META_COLLECTOR(int_sk_rcv_qlen) | |
408 | { | |
4f8f61eb YY |
409 | if (skip_nonlocal(skb)) { |
410 | *err = -1; | |
411 | return; | |
412 | } | |
48900629 TG |
413 | dst->value = skb->sk->sk_receive_queue.qlen; |
414 | } | |
415 | ||
416 | META_COLLECTOR(int_sk_snd_qlen) | |
417 | { | |
4f8f61eb YY |
418 | if (skip_nonlocal(skb)) { |
419 | *err = -1; | |
420 | return; | |
421 | } | |
48900629 TG |
422 | dst->value = skb->sk->sk_write_queue.qlen; |
423 | } | |
424 | ||
425 | META_COLLECTOR(int_sk_wmem_queued) | |
426 | { | |
4f8f61eb YY |
427 | if (skip_nonlocal(skb)) { |
428 | *err = -1; | |
429 | return; | |
430 | } | |
48900629 TG |
431 | dst->value = skb->sk->sk_wmem_queued; |
432 | } | |
433 | ||
434 | META_COLLECTOR(int_sk_fwd_alloc) | |
435 | { | |
4f8f61eb YY |
436 | if (skip_nonlocal(skb)) { |
437 | *err = -1; | |
438 | return; | |
439 | } | |
48900629 TG |
440 | dst->value = skb->sk->sk_forward_alloc; |
441 | } | |
442 | ||
443 | META_COLLECTOR(int_sk_sndbuf) | |
444 | { | |
4f8f61eb YY |
445 | if (skip_nonlocal(skb)) { |
446 | *err = -1; | |
447 | return; | |
448 | } | |
48900629 TG |
449 | dst->value = skb->sk->sk_sndbuf; |
450 | } | |
451 | ||
452 | META_COLLECTOR(int_sk_alloc) | |
453 | { | |
4f8f61eb YY |
454 | if (skip_nonlocal(skb)) { |
455 | *err = -1; | |
456 | return; | |
457 | } | |
e0c56310 | 458 | dst->value = (__force int) skb->sk->sk_allocation; |
48900629 TG |
459 | } |
460 | ||
81c3d547 | 461 | META_COLLECTOR(int_sk_hash) |
48900629 | 462 | { |
4f8f61eb YY |
463 | if (skip_nonlocal(skb)) { |
464 | *err = -1; | |
465 | return; | |
466 | } | |
81c3d547 | 467 | dst->value = skb->sk->sk_hash; |
48900629 TG |
468 | } |
469 | ||
470 | META_COLLECTOR(int_sk_lingertime) | |
471 | { | |
4f8f61eb YY |
472 | if (skip_nonlocal(skb)) { |
473 | *err = -1; | |
474 | return; | |
475 | } | |
48900629 TG |
476 | dst->value = skb->sk->sk_lingertime / HZ; |
477 | } | |
478 | ||
479 | META_COLLECTOR(int_sk_err_qlen) | |
480 | { | |
4f8f61eb YY |
481 | if (skip_nonlocal(skb)) { |
482 | *err = -1; | |
483 | return; | |
484 | } | |
48900629 TG |
485 | dst->value = skb->sk->sk_error_queue.qlen; |
486 | } | |
487 | ||
488 | META_COLLECTOR(int_sk_ack_bl) | |
489 | { | |
4f8f61eb YY |
490 | if (skip_nonlocal(skb)) { |
491 | *err = -1; | |
492 | return; | |
493 | } | |
48900629 TG |
494 | dst->value = skb->sk->sk_ack_backlog; |
495 | } | |
496 | ||
497 | META_COLLECTOR(int_sk_max_ack_bl) | |
498 | { | |
4f8f61eb YY |
499 | if (skip_nonlocal(skb)) { |
500 | *err = -1; | |
501 | return; | |
502 | } | |
48900629 TG |
503 | dst->value = skb->sk->sk_max_ack_backlog; |
504 | } | |
505 | ||
506 | META_COLLECTOR(int_sk_prio) | |
507 | { | |
4f8f61eb YY |
508 | if (skip_nonlocal(skb)) { |
509 | *err = -1; | |
510 | return; | |
511 | } | |
48900629 TG |
512 | dst->value = skb->sk->sk_priority; |
513 | } | |
514 | ||
515 | META_COLLECTOR(int_sk_rcvlowat) | |
516 | { | |
4f8f61eb YY |
517 | if (skip_nonlocal(skb)) { |
518 | *err = -1; | |
519 | return; | |
520 | } | |
48900629 TG |
521 | dst->value = skb->sk->sk_rcvlowat; |
522 | } | |
523 | ||
524 | META_COLLECTOR(int_sk_rcvtimeo) | |
525 | { | |
4f8f61eb YY |
526 | if (skip_nonlocal(skb)) { |
527 | *err = -1; | |
528 | return; | |
529 | } | |
48900629 TG |
530 | dst->value = skb->sk->sk_rcvtimeo / HZ; |
531 | } | |
532 | ||
533 | META_COLLECTOR(int_sk_sndtimeo) | |
534 | { | |
4f8f61eb YY |
535 | if (skip_nonlocal(skb)) { |
536 | *err = -1; | |
537 | return; | |
538 | } | |
48900629 TG |
539 | dst->value = skb->sk->sk_sndtimeo / HZ; |
540 | } | |
541 | ||
542 | META_COLLECTOR(int_sk_sendmsg_off) | |
543 | { | |
4f8f61eb YY |
544 | if (skip_nonlocal(skb)) { |
545 | *err = -1; | |
546 | return; | |
547 | } | |
5640f768 | 548 | dst->value = skb->sk->sk_frag.offset; |
48900629 TG |
549 | } |
550 | ||
551 | META_COLLECTOR(int_sk_write_pend) | |
552 | { | |
4f8f61eb YY |
553 | if (skip_nonlocal(skb)) { |
554 | *err = -1; | |
555 | return; | |
556 | } | |
48900629 TG |
557 | dst->value = skb->sk->sk_write_pending; |
558 | } | |
559 | ||
1da177e4 LT |
560 | /************************************************************************** |
561 | * Meta value collectors assignment table | |
562 | **************************************************************************/ | |
563 | ||
cc7ec456 | 564 | struct meta_ops { |
1da177e4 LT |
565 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, |
566 | struct meta_value *, struct meta_obj *, int *); | |
567 | }; | |
568 | ||
48900629 TG |
569 | #define META_ID(name) TCF_META_ID_##name |
570 | #define META_FUNC(name) { .get = meta_##name } | |
571 | ||
1da177e4 LT |
572 | /* Meta value operations table listing all meta value collectors and |
573 | * assigns them to a type and meta id. */ | |
cc7ec456 | 574 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = { |
1da177e4 | 575 | [TCF_META_TYPE_VAR] = { |
48900629 | 576 | [META_ID(DEV)] = META_FUNC(var_dev), |
48900629 | 577 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
1da177e4 LT |
578 | }, |
579 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
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), | |
48900629 TG |
585 | [META_ID(PRIORITY)] = META_FUNC(int_priority), |
586 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
48900629 TG |
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), | |
82e91ffe | 591 | [META_ID(NFMARK)] = META_FUNC(int_mark), |
48900629 | 592 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
48900629 | 593 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
48900629 TG |
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), | |
81c3d547 | 614 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
48900629 TG |
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), | |
3113e88c | 624 | [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag), |
c2e3143e | 625 | [META_ID(RXHASH)] = META_FUNC(int_rxhash), |
1da177e4 LT |
626 | } |
627 | }; | |
628 | ||
cc7ec456 | 629 | static inline struct meta_ops *meta_ops(struct meta_value *val) |
1da177e4 LT |
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 | ||
add93b61 | 648 | static int meta_var_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 649 | { |
add93b61 | 650 | int len = nla_len(nla); |
1da177e4 | 651 | |
add93b61 | 652 | dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); |
1da177e4 LT |
653 | if (dst->val == 0UL) |
654 | return -ENOMEM; | |
1da177e4 LT |
655 | dst->len = len; |
656 | return 0; | |
657 | } | |
658 | ||
659 | static void meta_var_destroy(struct meta_value *v) | |
660 | { | |
a51482bd | 661 | kfree((void *) v->val); |
1da177e4 LT |
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 | { | |
1b34ec43 DM |
675 | if (v->val && v->len && |
676 | nla_put(skb, tlv, v->len, (void *) v->val)) | |
677 | goto nla_put_failure; | |
1da177e4 LT |
678 | return 0; |
679 | ||
add93b61 | 680 | nla_put_failure: |
1da177e4 LT |
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. */ | |
98e56405 | 693 | if (unlikely(a->value == b->value)) |
1da177e4 | 694 | return 0; |
98e56405 | 695 | else if (a->value < b->value) |
1da177e4 LT |
696 | return -1; |
697 | else | |
698 | return 1; | |
699 | } | |
700 | ||
add93b61 | 701 | static int meta_int_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 702 | { |
add93b61 PM |
703 | if (nla_len(nla) >= sizeof(unsigned long)) { |
704 | dst->val = *(unsigned long *) nla_data(nla); | |
1da177e4 | 705 | dst->len = sizeof(unsigned long); |
add93b61 | 706 | } else if (nla_len(nla) == sizeof(u32)) { |
1587bac4 | 707 | dst->val = nla_get_u32(nla); |
1da177e4 LT |
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 | { | |
1b34ec43 DM |
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 | } | |
1da177e4 LT |
734 | |
735 | return 0; | |
736 | ||
add93b61 | 737 | nla_put_failure: |
1da177e4 LT |
738 | return -1; |
739 | } | |
740 | ||
741 | /************************************************************************** | |
742 | * Type specific operations table | |
743 | **************************************************************************/ | |
744 | ||
cc7ec456 | 745 | struct meta_type_ops { |
1da177e4 LT |
746 | void (*destroy)(struct meta_value *); |
747 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
add93b61 | 748 | int (*change)(struct meta_value *, struct nlattr *); |
1da177e4 LT |
749 | void (*apply_extras)(struct meta_value *, struct meta_obj *); |
750 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
751 | }; | |
752 | ||
cc7ec456 | 753 | static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = { |
1da177e4 LT |
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 | ||
cc7ec456 | 769 | static inline struct meta_type_ops *meta_type_ops(struct meta_value *v) |
1da177e4 LT |
770 | { |
771 | return &__meta_type_ops[meta_type(v)]; | |
772 | } | |
773 | ||
774 | /************************************************************************** | |
775 | * Core | |
776 | **************************************************************************/ | |
777 | ||
ed7af3b3 SH |
778 | static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, |
779 | struct meta_value *v, struct meta_obj *dst) | |
1da177e4 LT |
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) | |
cc7ec456 | 794 | meta_type_ops(v)->apply_extras(v, dst); |
1da177e4 LT |
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) { | |
cc7ec456 ED |
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; | |
1da177e4 LT |
819 | } |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
ed7af3b3 | 824 | static void meta_delete(struct meta_match *meta) |
1da177e4 | 825 | { |
04f217ac SH |
826 | if (meta) { |
827 | struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
1da177e4 | 828 | |
04f217ac SH |
829 | if (ops && ops->destroy) { |
830 | ops->destroy(&meta->lvalue); | |
831 | ops->destroy(&meta->rvalue); | |
832 | } | |
1da177e4 LT |
833 | } |
834 | ||
835 | kfree(meta); | |
836 | } | |
837 | ||
add93b61 | 838 | static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 839 | { |
add93b61 PM |
840 | if (nla) { |
841 | if (nla_len(nla) == 0) | |
1da177e4 LT |
842 | return -EINVAL; |
843 | ||
add93b61 | 844 | return meta_type_ops(dst)->change(dst, nla); |
1da177e4 LT |
845 | } |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static inline int meta_is_supported(struct meta_value *val) | |
851 | { | |
cc7ec456 | 852 | return !meta_id(val) || meta_ops(val)->get; |
1da177e4 LT |
853 | } |
854 | ||
7a9c1bd4 PM |
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 | ||
1da177e4 LT |
859 | static int em_meta_change(struct tcf_proto *tp, void *data, int len, |
860 | struct tcf_ematch *m) | |
861 | { | |
cee63723 | 862 | int err; |
add93b61 | 863 | struct nlattr *tb[TCA_EM_META_MAX + 1]; |
1da177e4 LT |
864 | struct tcf_meta_hdr *hdr; |
865 | struct meta_match *meta = NULL; | |
10297b99 | 866 | |
7a9c1bd4 | 867 | err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy); |
cee63723 | 868 | if (err < 0) |
1da177e4 LT |
869 | goto errout; |
870 | ||
cee63723 | 871 | err = -EINVAL; |
7a9c1bd4 | 872 | if (tb[TCA_EM_META_HDR] == NULL) |
1da177e4 | 873 | goto errout; |
add93b61 | 874 | hdr = nla_data(tb[TCA_EM_META_HDR]); |
1da177e4 LT |
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 | ||
0da974f4 | 882 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
0c4e4020 | 883 | if (meta == NULL) { |
884 | err = -ENOMEM; | |
1da177e4 | 885 | goto errout; |
0c4e4020 | 886 | } |
1da177e4 LT |
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 | ||
add93b61 PM |
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) | |
1da177e4 LT |
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 | ||
1b34ec43 DM |
927 | if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr)) |
928 | goto nla_put_failure; | |
1da177e4 LT |
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) | |
add93b61 | 933 | goto nla_put_failure; |
1da177e4 LT |
934 | |
935 | return 0; | |
936 | ||
add93b61 | 937 | nla_put_failure: |
1da177e4 | 938 | return -1; |
10297b99 | 939 | } |
1da177e4 LT |
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 | ||
10297b99 | 956 | static void __exit exit_em_meta(void) |
1da177e4 LT |
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); | |
db3d99c0 PM |
965 | |
966 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |