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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/sched/loadavg.h> | |
67 | #include <linux/string.h> | |
68 | #include <linux/skbuff.h> | |
69 | #include <linux/random.h> | |
70 | #include <linux/if_vlan.h> | |
71 | #include <linux/tc_ematch/tc_em_meta.h> | |
72 | #include <net/dst.h> | |
73 | #include <net/route.h> | |
74 | #include <net/pkt_cls.h> | |
75 | #include <net/sock.h> | |
76 | ||
77 | struct meta_obj { | |
78 | unsigned long value; | |
79 | unsigned int len; | |
80 | }; | |
81 | ||
82 | struct meta_value { | |
83 | struct tcf_meta_val hdr; | |
84 | unsigned long val; | |
85 | unsigned int len; | |
86 | }; | |
87 | ||
88 | struct meta_match { | |
89 | struct meta_value lvalue; | |
90 | struct meta_value rvalue; | |
91 | }; | |
92 | ||
93 | static inline int meta_id(struct meta_value *v) | |
94 | { | |
95 | return TCF_META_ID(v->hdr.kind); | |
96 | } | |
97 | ||
98 | static inline int meta_type(struct meta_value *v) | |
99 | { | |
100 | return TCF_META_TYPE(v->hdr.kind); | |
101 | } | |
102 | ||
103 | #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \ | |
104 | struct tcf_pkt_info *info, struct meta_value *v, \ | |
105 | struct meta_obj *dst, int *err) | |
106 | ||
107 | /************************************************************************** | |
108 | * System status & misc | |
109 | **************************************************************************/ | |
110 | ||
111 | META_COLLECTOR(int_random) | |
112 | { | |
113 | get_random_bytes(&dst->value, sizeof(dst->value)); | |
114 | } | |
115 | ||
116 | static inline unsigned long fixed_loadavg(int load) | |
117 | { | |
118 | int rnd_load = load + (FIXED_1/200); | |
119 | int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT; | |
120 | ||
121 | return ((rnd_load >> FSHIFT) * 100) + rnd_frac; | |
122 | } | |
123 | ||
124 | META_COLLECTOR(int_loadavg_0) | |
125 | { | |
126 | dst->value = fixed_loadavg(avenrun[0]); | |
127 | } | |
128 | ||
129 | META_COLLECTOR(int_loadavg_1) | |
130 | { | |
131 | dst->value = fixed_loadavg(avenrun[1]); | |
132 | } | |
133 | ||
134 | META_COLLECTOR(int_loadavg_2) | |
135 | { | |
136 | dst->value = fixed_loadavg(avenrun[2]); | |
137 | } | |
138 | ||
139 | /************************************************************************** | |
140 | * Device names & indices | |
141 | **************************************************************************/ | |
142 | ||
143 | static inline int int_dev(struct net_device *dev, struct meta_obj *dst) | |
144 | { | |
145 | if (unlikely(dev == NULL)) | |
146 | return -1; | |
147 | ||
148 | dst->value = dev->ifindex; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static inline int var_dev(struct net_device *dev, struct meta_obj *dst) | |
153 | { | |
154 | if (unlikely(dev == NULL)) | |
155 | return -1; | |
156 | ||
157 | dst->value = (unsigned long) dev->name; | |
158 | dst->len = strlen(dev->name); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | META_COLLECTOR(int_dev) | |
163 | { | |
164 | *err = int_dev(skb->dev, dst); | |
165 | } | |
166 | ||
167 | META_COLLECTOR(var_dev) | |
168 | { | |
169 | *err = var_dev(skb->dev, dst); | |
170 | } | |
171 | ||
172 | /************************************************************************** | |
173 | * vlan tag | |
174 | **************************************************************************/ | |
175 | ||
176 | META_COLLECTOR(int_vlan_tag) | |
177 | { | |
178 | unsigned short tag; | |
179 | ||
180 | if (skb_vlan_tag_present(skb)) | |
181 | dst->value = skb_vlan_tag_get(skb); | |
182 | else if (!__vlan_get_tag(skb, &tag)) | |
183 | dst->value = tag; | |
184 | else | |
185 | *err = -1; | |
186 | } | |
187 | ||
188 | ||
189 | ||
190 | /************************************************************************** | |
191 | * skb attributes | |
192 | **************************************************************************/ | |
193 | ||
194 | META_COLLECTOR(int_priority) | |
195 | { | |
196 | dst->value = skb->priority; | |
197 | } | |
198 | ||
199 | META_COLLECTOR(int_protocol) | |
200 | { | |
201 | /* Let userspace take care of the byte ordering */ | |
202 | dst->value = tc_skb_protocol(skb); | |
203 | } | |
204 | ||
205 | META_COLLECTOR(int_pkttype) | |
206 | { | |
207 | dst->value = skb->pkt_type; | |
208 | } | |
209 | ||
210 | META_COLLECTOR(int_pktlen) | |
211 | { | |
212 | dst->value = skb->len; | |
213 | } | |
214 | ||
215 | META_COLLECTOR(int_datalen) | |
216 | { | |
217 | dst->value = skb->data_len; | |
218 | } | |
219 | ||
220 | META_COLLECTOR(int_maclen) | |
221 | { | |
222 | dst->value = skb->mac_len; | |
223 | } | |
224 | ||
225 | META_COLLECTOR(int_rxhash) | |
226 | { | |
227 | dst->value = skb_get_hash(skb); | |
228 | } | |
229 | ||
230 | /************************************************************************** | |
231 | * Netfilter | |
232 | **************************************************************************/ | |
233 | ||
234 | META_COLLECTOR(int_mark) | |
235 | { | |
236 | dst->value = skb->mark; | |
237 | } | |
238 | ||
239 | /************************************************************************** | |
240 | * Traffic Control | |
241 | **************************************************************************/ | |
242 | ||
243 | META_COLLECTOR(int_tcindex) | |
244 | { | |
245 | dst->value = skb->tc_index; | |
246 | } | |
247 | ||
248 | /************************************************************************** | |
249 | * Routing | |
250 | **************************************************************************/ | |
251 | ||
252 | META_COLLECTOR(int_rtclassid) | |
253 | { | |
254 | if (unlikely(skb_dst(skb) == NULL)) | |
255 | *err = -1; | |
256 | else | |
257 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
258 | dst->value = skb_dst(skb)->tclassid; | |
259 | #else | |
260 | dst->value = 0; | |
261 | #endif | |
262 | } | |
263 | ||
264 | META_COLLECTOR(int_rtiif) | |
265 | { | |
266 | if (unlikely(skb_rtable(skb) == NULL)) | |
267 | *err = -1; | |
268 | else | |
269 | dst->value = inet_iif(skb); | |
270 | } | |
271 | ||
272 | /************************************************************************** | |
273 | * Socket Attributes | |
274 | **************************************************************************/ | |
275 | ||
276 | #define skip_nonlocal(skb) \ | |
277 | (unlikely(skb->sk == NULL)) | |
278 | ||
279 | META_COLLECTOR(int_sk_family) | |
280 | { | |
281 | if (skip_nonlocal(skb)) { | |
282 | *err = -1; | |
283 | return; | |
284 | } | |
285 | dst->value = skb->sk->sk_family; | |
286 | } | |
287 | ||
288 | META_COLLECTOR(int_sk_state) | |
289 | { | |
290 | if (skip_nonlocal(skb)) { | |
291 | *err = -1; | |
292 | return; | |
293 | } | |
294 | dst->value = skb->sk->sk_state; | |
295 | } | |
296 | ||
297 | META_COLLECTOR(int_sk_reuse) | |
298 | { | |
299 | if (skip_nonlocal(skb)) { | |
300 | *err = -1; | |
301 | return; | |
302 | } | |
303 | dst->value = skb->sk->sk_reuse; | |
304 | } | |
305 | ||
306 | META_COLLECTOR(int_sk_bound_if) | |
307 | { | |
308 | if (skip_nonlocal(skb)) { | |
309 | *err = -1; | |
310 | return; | |
311 | } | |
312 | /* No error if bound_dev_if is 0, legal userspace check */ | |
313 | dst->value = skb->sk->sk_bound_dev_if; | |
314 | } | |
315 | ||
316 | META_COLLECTOR(var_sk_bound_if) | |
317 | { | |
318 | if (skip_nonlocal(skb)) { | |
319 | *err = -1; | |
320 | return; | |
321 | } | |
322 | ||
323 | if (skb->sk->sk_bound_dev_if == 0) { | |
324 | dst->value = (unsigned long) "any"; | |
325 | dst->len = 3; | |
326 | } else { | |
327 | struct net_device *dev; | |
328 | ||
329 | rcu_read_lock(); | |
330 | dev = dev_get_by_index_rcu(sock_net(skb->sk), | |
331 | skb->sk->sk_bound_dev_if); | |
332 | *err = var_dev(dev, dst); | |
333 | rcu_read_unlock(); | |
334 | } | |
335 | } | |
336 | ||
337 | META_COLLECTOR(int_sk_refcnt) | |
338 | { | |
339 | if (skip_nonlocal(skb)) { | |
340 | *err = -1; | |
341 | return; | |
342 | } | |
343 | dst->value = atomic_read(&skb->sk->sk_refcnt); | |
344 | } | |
345 | ||
346 | META_COLLECTOR(int_sk_rcvbuf) | |
347 | { | |
348 | const struct sock *sk = skb_to_full_sk(skb); | |
349 | ||
350 | if (!sk) { | |
351 | *err = -1; | |
352 | return; | |
353 | } | |
354 | dst->value = sk->sk_rcvbuf; | |
355 | } | |
356 | ||
357 | META_COLLECTOR(int_sk_shutdown) | |
358 | { | |
359 | const struct sock *sk = skb_to_full_sk(skb); | |
360 | ||
361 | if (!sk) { | |
362 | *err = -1; | |
363 | return; | |
364 | } | |
365 | dst->value = sk->sk_shutdown; | |
366 | } | |
367 | ||
368 | META_COLLECTOR(int_sk_proto) | |
369 | { | |
370 | const struct sock *sk = skb_to_full_sk(skb); | |
371 | ||
372 | if (!sk) { | |
373 | *err = -1; | |
374 | return; | |
375 | } | |
376 | dst->value = sk->sk_protocol; | |
377 | } | |
378 | ||
379 | META_COLLECTOR(int_sk_type) | |
380 | { | |
381 | const struct sock *sk = skb_to_full_sk(skb); | |
382 | ||
383 | if (!sk) { | |
384 | *err = -1; | |
385 | return; | |
386 | } | |
387 | dst->value = sk->sk_type; | |
388 | } | |
389 | ||
390 | META_COLLECTOR(int_sk_rmem_alloc) | |
391 | { | |
392 | const struct sock *sk = skb_to_full_sk(skb); | |
393 | ||
394 | if (!sk) { | |
395 | *err = -1; | |
396 | return; | |
397 | } | |
398 | dst->value = sk_rmem_alloc_get(sk); | |
399 | } | |
400 | ||
401 | META_COLLECTOR(int_sk_wmem_alloc) | |
402 | { | |
403 | const struct sock *sk = skb_to_full_sk(skb); | |
404 | ||
405 | if (!sk) { | |
406 | *err = -1; | |
407 | return; | |
408 | } | |
409 | dst->value = sk_wmem_alloc_get(sk); | |
410 | } | |
411 | ||
412 | META_COLLECTOR(int_sk_omem_alloc) | |
413 | { | |
414 | const struct sock *sk = skb_to_full_sk(skb); | |
415 | ||
416 | if (!sk) { | |
417 | *err = -1; | |
418 | return; | |
419 | } | |
420 | dst->value = atomic_read(&sk->sk_omem_alloc); | |
421 | } | |
422 | ||
423 | META_COLLECTOR(int_sk_rcv_qlen) | |
424 | { | |
425 | const struct sock *sk = skb_to_full_sk(skb); | |
426 | ||
427 | if (!sk) { | |
428 | *err = -1; | |
429 | return; | |
430 | } | |
431 | dst->value = sk->sk_receive_queue.qlen; | |
432 | } | |
433 | ||
434 | META_COLLECTOR(int_sk_snd_qlen) | |
435 | { | |
436 | const struct sock *sk = skb_to_full_sk(skb); | |
437 | ||
438 | if (!sk) { | |
439 | *err = -1; | |
440 | return; | |
441 | } | |
442 | dst->value = sk->sk_write_queue.qlen; | |
443 | } | |
444 | ||
445 | META_COLLECTOR(int_sk_wmem_queued) | |
446 | { | |
447 | const struct sock *sk = skb_to_full_sk(skb); | |
448 | ||
449 | if (!sk) { | |
450 | *err = -1; | |
451 | return; | |
452 | } | |
453 | dst->value = sk->sk_wmem_queued; | |
454 | } | |
455 | ||
456 | META_COLLECTOR(int_sk_fwd_alloc) | |
457 | { | |
458 | const struct sock *sk = skb_to_full_sk(skb); | |
459 | ||
460 | if (!sk) { | |
461 | *err = -1; | |
462 | return; | |
463 | } | |
464 | dst->value = sk->sk_forward_alloc; | |
465 | } | |
466 | ||
467 | META_COLLECTOR(int_sk_sndbuf) | |
468 | { | |
469 | const struct sock *sk = skb_to_full_sk(skb); | |
470 | ||
471 | if (!sk) { | |
472 | *err = -1; | |
473 | return; | |
474 | } | |
475 | dst->value = sk->sk_sndbuf; | |
476 | } | |
477 | ||
478 | META_COLLECTOR(int_sk_alloc) | |
479 | { | |
480 | const struct sock *sk = skb_to_full_sk(skb); | |
481 | ||
482 | if (!sk) { | |
483 | *err = -1; | |
484 | return; | |
485 | } | |
486 | dst->value = (__force int) sk->sk_allocation; | |
487 | } | |
488 | ||
489 | META_COLLECTOR(int_sk_hash) | |
490 | { | |
491 | if (skip_nonlocal(skb)) { | |
492 | *err = -1; | |
493 | return; | |
494 | } | |
495 | dst->value = skb->sk->sk_hash; | |
496 | } | |
497 | ||
498 | META_COLLECTOR(int_sk_lingertime) | |
499 | { | |
500 | const struct sock *sk = skb_to_full_sk(skb); | |
501 | ||
502 | if (!sk) { | |
503 | *err = -1; | |
504 | return; | |
505 | } | |
506 | dst->value = sk->sk_lingertime / HZ; | |
507 | } | |
508 | ||
509 | META_COLLECTOR(int_sk_err_qlen) | |
510 | { | |
511 | const struct sock *sk = skb_to_full_sk(skb); | |
512 | ||
513 | if (!sk) { | |
514 | *err = -1; | |
515 | return; | |
516 | } | |
517 | dst->value = sk->sk_error_queue.qlen; | |
518 | } | |
519 | ||
520 | META_COLLECTOR(int_sk_ack_bl) | |
521 | { | |
522 | const struct sock *sk = skb_to_full_sk(skb); | |
523 | ||
524 | if (!sk) { | |
525 | *err = -1; | |
526 | return; | |
527 | } | |
528 | dst->value = sk->sk_ack_backlog; | |
529 | } | |
530 | ||
531 | META_COLLECTOR(int_sk_max_ack_bl) | |
532 | { | |
533 | const struct sock *sk = skb_to_full_sk(skb); | |
534 | ||
535 | if (!sk) { | |
536 | *err = -1; | |
537 | return; | |
538 | } | |
539 | dst->value = sk->sk_max_ack_backlog; | |
540 | } | |
541 | ||
542 | META_COLLECTOR(int_sk_prio) | |
543 | { | |
544 | const struct sock *sk = skb_to_full_sk(skb); | |
545 | ||
546 | if (!sk) { | |
547 | *err = -1; | |
548 | return; | |
549 | } | |
550 | dst->value = sk->sk_priority; | |
551 | } | |
552 | ||
553 | META_COLLECTOR(int_sk_rcvlowat) | |
554 | { | |
555 | const struct sock *sk = skb_to_full_sk(skb); | |
556 | ||
557 | if (!sk) { | |
558 | *err = -1; | |
559 | return; | |
560 | } | |
561 | dst->value = sk->sk_rcvlowat; | |
562 | } | |
563 | ||
564 | META_COLLECTOR(int_sk_rcvtimeo) | |
565 | { | |
566 | const struct sock *sk = skb_to_full_sk(skb); | |
567 | ||
568 | if (!sk) { | |
569 | *err = -1; | |
570 | return; | |
571 | } | |
572 | dst->value = sk->sk_rcvtimeo / HZ; | |
573 | } | |
574 | ||
575 | META_COLLECTOR(int_sk_sndtimeo) | |
576 | { | |
577 | const struct sock *sk = skb_to_full_sk(skb); | |
578 | ||
579 | if (!sk) { | |
580 | *err = -1; | |
581 | return; | |
582 | } | |
583 | dst->value = sk->sk_sndtimeo / HZ; | |
584 | } | |
585 | ||
586 | META_COLLECTOR(int_sk_sendmsg_off) | |
587 | { | |
588 | const struct sock *sk = skb_to_full_sk(skb); | |
589 | ||
590 | if (!sk) { | |
591 | *err = -1; | |
592 | return; | |
593 | } | |
594 | dst->value = sk->sk_frag.offset; | |
595 | } | |
596 | ||
597 | META_COLLECTOR(int_sk_write_pend) | |
598 | { | |
599 | const struct sock *sk = skb_to_full_sk(skb); | |
600 | ||
601 | if (!sk) { | |
602 | *err = -1; | |
603 | return; | |
604 | } | |
605 | dst->value = sk->sk_write_pending; | |
606 | } | |
607 | ||
608 | /************************************************************************** | |
609 | * Meta value collectors assignment table | |
610 | **************************************************************************/ | |
611 | ||
612 | struct meta_ops { | |
613 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, | |
614 | struct meta_value *, struct meta_obj *, int *); | |
615 | }; | |
616 | ||
617 | #define META_ID(name) TCF_META_ID_##name | |
618 | #define META_FUNC(name) { .get = meta_##name } | |
619 | ||
620 | /* Meta value operations table listing all meta value collectors and | |
621 | * assigns them to a type and meta id. */ | |
622 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = { | |
623 | [TCF_META_TYPE_VAR] = { | |
624 | [META_ID(DEV)] = META_FUNC(var_dev), | |
625 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), | |
626 | }, | |
627 | [TCF_META_TYPE_INT] = { | |
628 | [META_ID(RANDOM)] = META_FUNC(int_random), | |
629 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
630 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
631 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
632 | [META_ID(DEV)] = META_FUNC(int_dev), | |
633 | [META_ID(PRIORITY)] = META_FUNC(int_priority), | |
634 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
635 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), | |
636 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
637 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
638 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
639 | [META_ID(NFMARK)] = META_FUNC(int_mark), | |
640 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), | |
641 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), | |
642 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), | |
643 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
644 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
645 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
646 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
647 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
648 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
649 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
650 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
651 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
652 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
653 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
654 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
655 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
656 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
657 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
658 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
659 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
660 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
661 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
662 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), | |
663 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), | |
664 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
665 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
666 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
667 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
668 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
669 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
670 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
671 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
672 | [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag), | |
673 | [META_ID(RXHASH)] = META_FUNC(int_rxhash), | |
674 | } | |
675 | }; | |
676 | ||
677 | static inline struct meta_ops *meta_ops(struct meta_value *val) | |
678 | { | |
679 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
680 | } | |
681 | ||
682 | /************************************************************************** | |
683 | * Type specific operations for TCF_META_TYPE_VAR | |
684 | **************************************************************************/ | |
685 | ||
686 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
687 | { | |
688 | int r = a->len - b->len; | |
689 | ||
690 | if (r == 0) | |
691 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
692 | ||
693 | return r; | |
694 | } | |
695 | ||
696 | static int meta_var_change(struct meta_value *dst, struct nlattr *nla) | |
697 | { | |
698 | int len = nla_len(nla); | |
699 | ||
700 | dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); | |
701 | if (dst->val == 0UL) | |
702 | return -ENOMEM; | |
703 | dst->len = len; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static void meta_var_destroy(struct meta_value *v) | |
708 | { | |
709 | kfree((void *) v->val); | |
710 | } | |
711 | ||
712 | static void meta_var_apply_extras(struct meta_value *v, | |
713 | struct meta_obj *dst) | |
714 | { | |
715 | int shift = v->hdr.shift; | |
716 | ||
717 | if (shift && shift < dst->len) | |
718 | dst->len -= shift; | |
719 | } | |
720 | ||
721 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
722 | { | |
723 | if (v->val && v->len && | |
724 | nla_put(skb, tlv, v->len, (void *) v->val)) | |
725 | goto nla_put_failure; | |
726 | return 0; | |
727 | ||
728 | nla_put_failure: | |
729 | return -1; | |
730 | } | |
731 | ||
732 | /************************************************************************** | |
733 | * Type specific operations for TCF_META_TYPE_INT | |
734 | **************************************************************************/ | |
735 | ||
736 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
737 | { | |
738 | /* Let gcc optimize it, the unlikely is not really based on | |
739 | * some numbers but jump free code for mismatches seems | |
740 | * more logical. */ | |
741 | if (unlikely(a->value == b->value)) | |
742 | return 0; | |
743 | else if (a->value < b->value) | |
744 | return -1; | |
745 | else | |
746 | return 1; | |
747 | } | |
748 | ||
749 | static int meta_int_change(struct meta_value *dst, struct nlattr *nla) | |
750 | { | |
751 | if (nla_len(nla) >= sizeof(unsigned long)) { | |
752 | dst->val = *(unsigned long *) nla_data(nla); | |
753 | dst->len = sizeof(unsigned long); | |
754 | } else if (nla_len(nla) == sizeof(u32)) { | |
755 | dst->val = nla_get_u32(nla); | |
756 | dst->len = sizeof(u32); | |
757 | } else | |
758 | return -EINVAL; | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | static void meta_int_apply_extras(struct meta_value *v, | |
764 | struct meta_obj *dst) | |
765 | { | |
766 | if (v->hdr.shift) | |
767 | dst->value >>= v->hdr.shift; | |
768 | ||
769 | if (v->val) | |
770 | dst->value &= v->val; | |
771 | } | |
772 | ||
773 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
774 | { | |
775 | if (v->len == sizeof(unsigned long)) { | |
776 | if (nla_put(skb, tlv, sizeof(unsigned long), &v->val)) | |
777 | goto nla_put_failure; | |
778 | } else if (v->len == sizeof(u32)) { | |
779 | if (nla_put_u32(skb, tlv, v->val)) | |
780 | goto nla_put_failure; | |
781 | } | |
782 | ||
783 | return 0; | |
784 | ||
785 | nla_put_failure: | |
786 | return -1; | |
787 | } | |
788 | ||
789 | /************************************************************************** | |
790 | * Type specific operations table | |
791 | **************************************************************************/ | |
792 | ||
793 | struct meta_type_ops { | |
794 | void (*destroy)(struct meta_value *); | |
795 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
796 | int (*change)(struct meta_value *, struct nlattr *); | |
797 | void (*apply_extras)(struct meta_value *, struct meta_obj *); | |
798 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
799 | }; | |
800 | ||
801 | static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = { | |
802 | [TCF_META_TYPE_VAR] = { | |
803 | .destroy = meta_var_destroy, | |
804 | .compare = meta_var_compare, | |
805 | .change = meta_var_change, | |
806 | .apply_extras = meta_var_apply_extras, | |
807 | .dump = meta_var_dump | |
808 | }, | |
809 | [TCF_META_TYPE_INT] = { | |
810 | .compare = meta_int_compare, | |
811 | .change = meta_int_change, | |
812 | .apply_extras = meta_int_apply_extras, | |
813 | .dump = meta_int_dump | |
814 | } | |
815 | }; | |
816 | ||
817 | static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v) | |
818 | { | |
819 | return &__meta_type_ops[meta_type(v)]; | |
820 | } | |
821 | ||
822 | /************************************************************************** | |
823 | * Core | |
824 | **************************************************************************/ | |
825 | ||
826 | static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, | |
827 | struct meta_value *v, struct meta_obj *dst) | |
828 | { | |
829 | int err = 0; | |
830 | ||
831 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
832 | dst->value = v->val; | |
833 | dst->len = v->len; | |
834 | return 0; | |
835 | } | |
836 | ||
837 | meta_ops(v)->get(skb, info, v, dst, &err); | |
838 | if (err < 0) | |
839 | return err; | |
840 | ||
841 | if (meta_type_ops(v)->apply_extras) | |
842 | meta_type_ops(v)->apply_extras(v, dst); | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
848 | struct tcf_pkt_info *info) | |
849 | { | |
850 | int r; | |
851 | struct meta_match *meta = (struct meta_match *) m->data; | |
852 | struct meta_obj l_value, r_value; | |
853 | ||
854 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
855 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
856 | return 0; | |
857 | ||
858 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
859 | ||
860 | switch (meta->lvalue.hdr.op) { | |
861 | case TCF_EM_OPND_EQ: | |
862 | return !r; | |
863 | case TCF_EM_OPND_LT: | |
864 | return r < 0; | |
865 | case TCF_EM_OPND_GT: | |
866 | return r > 0; | |
867 | } | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | static void meta_delete(struct meta_match *meta) | |
873 | { | |
874 | if (meta) { | |
875 | const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
876 | ||
877 | if (ops && ops->destroy) { | |
878 | ops->destroy(&meta->lvalue); | |
879 | ops->destroy(&meta->rvalue); | |
880 | } | |
881 | } | |
882 | ||
883 | kfree(meta); | |
884 | } | |
885 | ||
886 | static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) | |
887 | { | |
888 | if (nla) { | |
889 | if (nla_len(nla) == 0) | |
890 | return -EINVAL; | |
891 | ||
892 | return meta_type_ops(dst)->change(dst, nla); | |
893 | } | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | static inline int meta_is_supported(struct meta_value *val) | |
899 | { | |
900 | return !meta_id(val) || meta_ops(val)->get; | |
901 | } | |
902 | ||
903 | static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = { | |
904 | [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) }, | |
905 | }; | |
906 | ||
907 | static int em_meta_change(struct net *net, void *data, int len, | |
908 | struct tcf_ematch *m) | |
909 | { | |
910 | int err; | |
911 | struct nlattr *tb[TCA_EM_META_MAX + 1]; | |
912 | struct tcf_meta_hdr *hdr; | |
913 | struct meta_match *meta = NULL; | |
914 | ||
915 | err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy); | |
916 | if (err < 0) | |
917 | goto errout; | |
918 | ||
919 | err = -EINVAL; | |
920 | if (tb[TCA_EM_META_HDR] == NULL) | |
921 | goto errout; | |
922 | hdr = nla_data(tb[TCA_EM_META_HDR]); | |
923 | ||
924 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
925 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
926 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
927 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
928 | goto errout; | |
929 | ||
930 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); | |
931 | if (meta == NULL) { | |
932 | err = -ENOMEM; | |
933 | goto errout; | |
934 | } | |
935 | ||
936 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
937 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
938 | ||
939 | if (!meta_is_supported(&meta->lvalue) || | |
940 | !meta_is_supported(&meta->rvalue)) { | |
941 | err = -EOPNOTSUPP; | |
942 | goto errout; | |
943 | } | |
944 | ||
945 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 || | |
946 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0) | |
947 | goto errout; | |
948 | ||
949 | m->datalen = sizeof(*meta); | |
950 | m->data = (unsigned long) meta; | |
951 | ||
952 | err = 0; | |
953 | errout: | |
954 | if (err && meta) | |
955 | meta_delete(meta); | |
956 | return err; | |
957 | } | |
958 | ||
959 | static void em_meta_destroy(struct tcf_ematch *m) | |
960 | { | |
961 | if (m) | |
962 | meta_delete((struct meta_match *) m->data); | |
963 | } | |
964 | ||
965 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
966 | { | |
967 | struct meta_match *meta = (struct meta_match *) em->data; | |
968 | struct tcf_meta_hdr hdr; | |
969 | const struct meta_type_ops *ops; | |
970 | ||
971 | memset(&hdr, 0, sizeof(hdr)); | |
972 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
973 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
974 | ||
975 | if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr)) | |
976 | goto nla_put_failure; | |
977 | ||
978 | ops = meta_type_ops(&meta->lvalue); | |
979 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
980 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
981 | goto nla_put_failure; | |
982 | ||
983 | return 0; | |
984 | ||
985 | nla_put_failure: | |
986 | return -1; | |
987 | } | |
988 | ||
989 | static struct tcf_ematch_ops em_meta_ops = { | |
990 | .kind = TCF_EM_META, | |
991 | .change = em_meta_change, | |
992 | .match = em_meta_match, | |
993 | .destroy = em_meta_destroy, | |
994 | .dump = em_meta_dump, | |
995 | .owner = THIS_MODULE, | |
996 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
997 | }; | |
998 | ||
999 | static int __init init_em_meta(void) | |
1000 | { | |
1001 | return tcf_em_register(&em_meta_ops); | |
1002 | } | |
1003 | ||
1004 | static void __exit exit_em_meta(void) | |
1005 | { | |
1006 | tcf_em_unregister(&em_meta_ops); | |
1007 | } | |
1008 | ||
1009 | MODULE_LICENSE("GPL"); | |
1010 | ||
1011 | module_init(init_em_meta); | |
1012 | module_exit(exit_em_meta); | |
1013 | ||
1014 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |