]>
Commit | Line | Data |
---|---|---|
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 | * ========================================================================== | |
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: INDEV | | id: VALUE | | |
31 | * | data: | | data: 3 | | |
32 | * +-----------+ +-----------+ | |
33 | * | | | |
34 | * ---> meta_ops[INT][INDEV](...) | | |
48900629 | 35 | * | | |
1da177e4 LT |
36 | * ----------- | |
37 | * V V | |
38 | * +-----------+ +-----------+ | |
39 | * | type: INT | | type: INT | | |
40 | * obj | id: INDEV | | 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 | * Additionaly, type dependant modifiers such as shift operators | |
51 | * or mask may be applied to extend the functionaliy. As of now, | |
52 | * the variable length type supports shifting the byte string to | |
53 | * the right, eating up any number of octets and thus supporting | |
54 | * wildcard interface name comparisons such as "ppp%" matching | |
55 | * ppp0..9. | |
56 | * | |
57 | * NOTE: Certain meta values depend on other subsystems and are | |
58 | * only available if that subsytem is enabled in the kernel. | |
59 | */ | |
60 | ||
61 | #include <linux/config.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/tc_ematch/tc_em_meta.h> | |
70 | #include <net/dst.h> | |
71 | #include <net/route.h> | |
72 | #include <net/pkt_cls.h> | |
48900629 | 73 | #include <net/sock.h> |
1da177e4 LT |
74 | |
75 | struct meta_obj | |
76 | { | |
77 | unsigned long value; | |
78 | unsigned int len; | |
79 | }; | |
80 | ||
81 | struct meta_value | |
82 | { | |
83 | struct tcf_meta_val hdr; | |
84 | unsigned long val; | |
85 | unsigned int len; | |
86 | }; | |
87 | ||
88 | struct meta_match | |
89 | { | |
90 | struct meta_value lvalue; | |
91 | struct meta_value rvalue; | |
92 | }; | |
93 | ||
94 | static inline int meta_id(struct meta_value *v) | |
95 | { | |
96 | return TCF_META_ID(v->hdr.kind); | |
97 | } | |
98 | ||
99 | static inline int meta_type(struct meta_value *v) | |
100 | { | |
101 | return TCF_META_TYPE(v->hdr.kind); | |
102 | } | |
103 | ||
104 | #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \ | |
105 | struct tcf_pkt_info *info, struct meta_value *v, \ | |
106 | struct meta_obj *dst, int *err) | |
107 | ||
108 | /************************************************************************** | |
109 | * System status & misc | |
110 | **************************************************************************/ | |
111 | ||
112 | META_COLLECTOR(int_random) | |
113 | { | |
114 | get_random_bytes(&dst->value, sizeof(dst->value)); | |
115 | } | |
116 | ||
117 | static inline unsigned long fixed_loadavg(int load) | |
118 | { | |
119 | int rnd_load = load + (FIXED_1/200); | |
120 | int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT; | |
121 | ||
122 | return ((rnd_load >> FSHIFT) * 100) + rnd_frac; | |
123 | } | |
124 | ||
125 | META_COLLECTOR(int_loadavg_0) | |
126 | { | |
127 | dst->value = fixed_loadavg(avenrun[0]); | |
128 | } | |
129 | ||
130 | META_COLLECTOR(int_loadavg_1) | |
131 | { | |
132 | dst->value = fixed_loadavg(avenrun[1]); | |
133 | } | |
134 | ||
135 | META_COLLECTOR(int_loadavg_2) | |
136 | { | |
137 | dst->value = fixed_loadavg(avenrun[2]); | |
138 | } | |
139 | ||
140 | /************************************************************************** | |
141 | * Device names & indices | |
142 | **************************************************************************/ | |
143 | ||
144 | static inline int int_dev(struct net_device *dev, struct meta_obj *dst) | |
145 | { | |
146 | if (unlikely(dev == NULL)) | |
147 | return -1; | |
148 | ||
149 | dst->value = dev->ifindex; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static inline int var_dev(struct net_device *dev, struct meta_obj *dst) | |
154 | { | |
155 | if (unlikely(dev == NULL)) | |
156 | return -1; | |
157 | ||
158 | dst->value = (unsigned long) dev->name; | |
159 | dst->len = strlen(dev->name); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | META_COLLECTOR(int_dev) | |
164 | { | |
165 | *err = int_dev(skb->dev, dst); | |
166 | } | |
167 | ||
168 | META_COLLECTOR(var_dev) | |
169 | { | |
170 | *err = var_dev(skb->dev, dst); | |
171 | } | |
172 | ||
173 | META_COLLECTOR(int_indev) | |
174 | { | |
175 | *err = int_dev(skb->input_dev, dst); | |
176 | } | |
177 | ||
178 | META_COLLECTOR(var_indev) | |
179 | { | |
180 | *err = var_dev(skb->input_dev, dst); | |
181 | } | |
182 | ||
183 | META_COLLECTOR(int_realdev) | |
184 | { | |
185 | *err = int_dev(skb->real_dev, dst); | |
186 | } | |
187 | ||
188 | META_COLLECTOR(var_realdev) | |
189 | { | |
190 | *err = var_dev(skb->real_dev, dst); | |
191 | } | |
192 | ||
193 | /************************************************************************** | |
194 | * skb attributes | |
195 | **************************************************************************/ | |
196 | ||
197 | META_COLLECTOR(int_priority) | |
198 | { | |
199 | dst->value = skb->priority; | |
200 | } | |
201 | ||
202 | META_COLLECTOR(int_protocol) | |
203 | { | |
204 | /* Let userspace take care of the byte ordering */ | |
205 | dst->value = skb->protocol; | |
206 | } | |
207 | ||
208 | META_COLLECTOR(int_security) | |
209 | { | |
210 | dst->value = skb->security; | |
211 | } | |
212 | ||
213 | META_COLLECTOR(int_pkttype) | |
214 | { | |
215 | dst->value = skb->pkt_type; | |
216 | } | |
217 | ||
218 | META_COLLECTOR(int_pktlen) | |
219 | { | |
220 | dst->value = skb->len; | |
221 | } | |
222 | ||
223 | META_COLLECTOR(int_datalen) | |
224 | { | |
225 | dst->value = skb->data_len; | |
226 | } | |
227 | ||
228 | META_COLLECTOR(int_maclen) | |
229 | { | |
230 | dst->value = skb->mac_len; | |
231 | } | |
232 | ||
233 | /************************************************************************** | |
234 | * Netfilter | |
235 | **************************************************************************/ | |
236 | ||
237 | #ifdef CONFIG_NETFILTER | |
238 | META_COLLECTOR(int_nfmark) | |
239 | { | |
240 | dst->value = skb->nfmark; | |
241 | } | |
242 | #endif | |
243 | ||
244 | /************************************************************************** | |
245 | * Traffic Control | |
246 | **************************************************************************/ | |
247 | ||
248 | META_COLLECTOR(int_tcindex) | |
249 | { | |
250 | dst->value = skb->tc_index; | |
251 | } | |
252 | ||
253 | #ifdef CONFIG_NET_CLS_ACT | |
254 | META_COLLECTOR(int_tcverd) | |
255 | { | |
256 | dst->value = skb->tc_verd; | |
257 | } | |
258 | ||
259 | META_COLLECTOR(int_tcclassid) | |
260 | { | |
261 | dst->value = skb->tc_classid; | |
262 | } | |
263 | #endif | |
264 | ||
265 | /************************************************************************** | |
266 | * Routing | |
267 | **************************************************************************/ | |
268 | ||
269 | #ifdef CONFIG_NET_CLS_ROUTE | |
270 | META_COLLECTOR(int_rtclassid) | |
271 | { | |
272 | if (unlikely(skb->dst == NULL)) | |
273 | *err = -1; | |
274 | else | |
275 | dst->value = skb->dst->tclassid; | |
276 | } | |
277 | #endif | |
278 | ||
279 | META_COLLECTOR(int_rtiif) | |
280 | { | |
281 | if (unlikely(skb->dst == NULL)) | |
282 | *err = -1; | |
283 | else | |
284 | dst->value = ((struct rtable*) skb->dst)->fl.iif; | |
285 | } | |
286 | ||
48900629 TG |
287 | /************************************************************************** |
288 | * Socket Attributes | |
289 | **************************************************************************/ | |
290 | ||
291 | #define SKIP_NONLOCAL(skb) \ | |
292 | if (unlikely(skb->sk == NULL)) { \ | |
293 | *err = -1; \ | |
294 | return; \ | |
295 | } | |
296 | ||
297 | META_COLLECTOR(int_sk_family) | |
298 | { | |
299 | SKIP_NONLOCAL(skb); | |
300 | dst->value = skb->sk->sk_family; | |
301 | } | |
302 | ||
303 | META_COLLECTOR(int_sk_state) | |
304 | { | |
305 | SKIP_NONLOCAL(skb); | |
306 | dst->value = skb->sk->sk_state; | |
307 | } | |
308 | ||
309 | META_COLLECTOR(int_sk_reuse) | |
310 | { | |
311 | SKIP_NONLOCAL(skb); | |
312 | dst->value = skb->sk->sk_reuse; | |
313 | } | |
314 | ||
315 | META_COLLECTOR(int_sk_bound_if) | |
316 | { | |
317 | SKIP_NONLOCAL(skb); | |
318 | /* No error if bound_dev_if is 0, legal userspace check */ | |
319 | dst->value = skb->sk->sk_bound_dev_if; | |
320 | } | |
321 | ||
322 | META_COLLECTOR(var_sk_bound_if) | |
323 | { | |
324 | SKIP_NONLOCAL(skb); | |
325 | ||
326 | if (skb->sk->sk_bound_dev_if == 0) { | |
327 | dst->value = (unsigned long) "any"; | |
328 | dst->len = 3; | |
329 | } else { | |
330 | struct net_device *dev; | |
331 | ||
332 | dev = dev_get_by_index(skb->sk->sk_bound_dev_if); | |
333 | *err = var_dev(dev, dst); | |
334 | if (dev) | |
335 | dev_put(dev); | |
336 | } | |
337 | } | |
338 | ||
339 | META_COLLECTOR(int_sk_refcnt) | |
340 | { | |
341 | SKIP_NONLOCAL(skb); | |
342 | dst->value = atomic_read(&skb->sk->sk_refcnt); | |
343 | } | |
344 | ||
345 | META_COLLECTOR(int_sk_rcvbuf) | |
346 | { | |
347 | SKIP_NONLOCAL(skb); | |
348 | dst->value = skb->sk->sk_rcvbuf; | |
349 | } | |
350 | ||
351 | META_COLLECTOR(int_sk_shutdown) | |
352 | { | |
353 | SKIP_NONLOCAL(skb); | |
354 | dst->value = skb->sk->sk_shutdown; | |
355 | } | |
356 | ||
357 | META_COLLECTOR(int_sk_proto) | |
358 | { | |
359 | SKIP_NONLOCAL(skb); | |
360 | dst->value = skb->sk->sk_protocol; | |
361 | } | |
362 | ||
363 | META_COLLECTOR(int_sk_type) | |
364 | { | |
365 | SKIP_NONLOCAL(skb); | |
366 | dst->value = skb->sk->sk_type; | |
367 | } | |
368 | ||
369 | META_COLLECTOR(int_sk_rmem_alloc) | |
370 | { | |
371 | SKIP_NONLOCAL(skb); | |
372 | dst->value = atomic_read(&skb->sk->sk_rmem_alloc); | |
373 | } | |
374 | ||
375 | META_COLLECTOR(int_sk_wmem_alloc) | |
376 | { | |
377 | SKIP_NONLOCAL(skb); | |
378 | dst->value = atomic_read(&skb->sk->sk_wmem_alloc); | |
379 | } | |
380 | ||
381 | META_COLLECTOR(int_sk_omem_alloc) | |
382 | { | |
383 | SKIP_NONLOCAL(skb); | |
384 | dst->value = atomic_read(&skb->sk->sk_omem_alloc); | |
385 | } | |
386 | ||
387 | META_COLLECTOR(int_sk_rcv_qlen) | |
388 | { | |
389 | SKIP_NONLOCAL(skb); | |
390 | dst->value = skb->sk->sk_receive_queue.qlen; | |
391 | } | |
392 | ||
393 | META_COLLECTOR(int_sk_snd_qlen) | |
394 | { | |
395 | SKIP_NONLOCAL(skb); | |
396 | dst->value = skb->sk->sk_write_queue.qlen; | |
397 | } | |
398 | ||
399 | META_COLLECTOR(int_sk_wmem_queued) | |
400 | { | |
401 | SKIP_NONLOCAL(skb); | |
402 | dst->value = skb->sk->sk_wmem_queued; | |
403 | } | |
404 | ||
405 | META_COLLECTOR(int_sk_fwd_alloc) | |
406 | { | |
407 | SKIP_NONLOCAL(skb); | |
408 | dst->value = skb->sk->sk_forward_alloc; | |
409 | } | |
410 | ||
411 | META_COLLECTOR(int_sk_sndbuf) | |
412 | { | |
413 | SKIP_NONLOCAL(skb); | |
414 | dst->value = skb->sk->sk_sndbuf; | |
415 | } | |
416 | ||
417 | META_COLLECTOR(int_sk_alloc) | |
418 | { | |
419 | SKIP_NONLOCAL(skb); | |
420 | dst->value = skb->sk->sk_allocation; | |
421 | } | |
422 | ||
423 | META_COLLECTOR(int_sk_route_caps) | |
424 | { | |
425 | SKIP_NONLOCAL(skb); | |
426 | dst->value = skb->sk->sk_route_caps; | |
427 | } | |
428 | ||
429 | META_COLLECTOR(int_sk_hashent) | |
430 | { | |
431 | SKIP_NONLOCAL(skb); | |
432 | dst->value = skb->sk->sk_hashent; | |
433 | } | |
434 | ||
435 | META_COLLECTOR(int_sk_lingertime) | |
436 | { | |
437 | SKIP_NONLOCAL(skb); | |
438 | dst->value = skb->sk->sk_lingertime / HZ; | |
439 | } | |
440 | ||
441 | META_COLLECTOR(int_sk_err_qlen) | |
442 | { | |
443 | SKIP_NONLOCAL(skb); | |
444 | dst->value = skb->sk->sk_error_queue.qlen; | |
445 | } | |
446 | ||
447 | META_COLLECTOR(int_sk_ack_bl) | |
448 | { | |
449 | SKIP_NONLOCAL(skb); | |
450 | dst->value = skb->sk->sk_ack_backlog; | |
451 | } | |
452 | ||
453 | META_COLLECTOR(int_sk_max_ack_bl) | |
454 | { | |
455 | SKIP_NONLOCAL(skb); | |
456 | dst->value = skb->sk->sk_max_ack_backlog; | |
457 | } | |
458 | ||
459 | META_COLLECTOR(int_sk_prio) | |
460 | { | |
461 | SKIP_NONLOCAL(skb); | |
462 | dst->value = skb->sk->sk_priority; | |
463 | } | |
464 | ||
465 | META_COLLECTOR(int_sk_rcvlowat) | |
466 | { | |
467 | SKIP_NONLOCAL(skb); | |
468 | dst->value = skb->sk->sk_rcvlowat; | |
469 | } | |
470 | ||
471 | META_COLLECTOR(int_sk_rcvtimeo) | |
472 | { | |
473 | SKIP_NONLOCAL(skb); | |
474 | dst->value = skb->sk->sk_rcvtimeo / HZ; | |
475 | } | |
476 | ||
477 | META_COLLECTOR(int_sk_sndtimeo) | |
478 | { | |
479 | SKIP_NONLOCAL(skb); | |
480 | dst->value = skb->sk->sk_sndtimeo / HZ; | |
481 | } | |
482 | ||
483 | META_COLLECTOR(int_sk_sendmsg_off) | |
484 | { | |
485 | SKIP_NONLOCAL(skb); | |
486 | dst->value = skb->sk->sk_sndmsg_off; | |
487 | } | |
488 | ||
489 | META_COLLECTOR(int_sk_write_pend) | |
490 | { | |
491 | SKIP_NONLOCAL(skb); | |
492 | dst->value = skb->sk->sk_write_pending; | |
493 | } | |
494 | ||
1da177e4 LT |
495 | /************************************************************************** |
496 | * Meta value collectors assignment table | |
497 | **************************************************************************/ | |
498 | ||
499 | struct meta_ops | |
500 | { | |
501 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, | |
502 | struct meta_value *, struct meta_obj *, int *); | |
503 | }; | |
504 | ||
48900629 TG |
505 | #define META_ID(name) TCF_META_ID_##name |
506 | #define META_FUNC(name) { .get = meta_##name } | |
507 | ||
1da177e4 LT |
508 | /* Meta value operations table listing all meta value collectors and |
509 | * assigns them to a type and meta id. */ | |
510 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = { | |
511 | [TCF_META_TYPE_VAR] = { | |
48900629 TG |
512 | [META_ID(DEV)] = META_FUNC(var_dev), |
513 | [META_ID(INDEV)] = META_FUNC(var_indev), | |
514 | [META_ID(REALDEV)] = META_FUNC(var_realdev), | |
515 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), | |
1da177e4 LT |
516 | }, |
517 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
518 | [META_ID(RANDOM)] = META_FUNC(int_random), |
519 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
520 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
521 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
522 | [META_ID(DEV)] = META_FUNC(int_dev), | |
523 | [META_ID(INDEV)] = META_FUNC(int_indev), | |
524 | [META_ID(REALDEV)] = META_FUNC(int_realdev), | |
525 | [META_ID(PRIORITY)] = META_FUNC(int_priority), | |
526 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
527 | [META_ID(SECURITY)] = META_FUNC(int_security), | |
528 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), | |
529 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
530 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
531 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
1da177e4 | 532 | #ifdef CONFIG_NETFILTER |
48900629 | 533 | [META_ID(NFMARK)] = META_FUNC(int_nfmark), |
1da177e4 | 534 | #endif |
48900629 | 535 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
1da177e4 | 536 | #ifdef CONFIG_NET_CLS_ACT |
48900629 TG |
537 | [META_ID(TCVERDICT)] = META_FUNC(int_tcverd), |
538 | [META_ID(TCCLASSID)] = META_FUNC(int_tcclassid), | |
1da177e4 LT |
539 | #endif |
540 | #ifdef CONFIG_NET_CLS_ROUTE | |
48900629 | 541 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
1da177e4 | 542 | #endif |
48900629 TG |
543 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
544 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
545 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
546 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
547 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
548 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
549 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
550 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
551 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
552 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
553 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
554 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
555 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
556 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
557 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
558 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
559 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
560 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
561 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
562 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
563 | [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps), | |
564 | [META_ID(SK_HASHENT)] = META_FUNC(int_sk_hashent), | |
565 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), | |
566 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
567 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
568 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
569 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
570 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
571 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
572 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
573 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
1da177e4 LT |
574 | } |
575 | }; | |
576 | ||
577 | static inline struct meta_ops * meta_ops(struct meta_value *val) | |
578 | { | |
579 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
580 | } | |
581 | ||
582 | /************************************************************************** | |
583 | * Type specific operations for TCF_META_TYPE_VAR | |
584 | **************************************************************************/ | |
585 | ||
586 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
587 | { | |
588 | int r = a->len - b->len; | |
589 | ||
590 | if (r == 0) | |
591 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
592 | ||
593 | return r; | |
594 | } | |
595 | ||
596 | static int meta_var_change(struct meta_value *dst, struct rtattr *rta) | |
597 | { | |
598 | int len = RTA_PAYLOAD(rta); | |
599 | ||
600 | dst->val = (unsigned long) kmalloc(len, GFP_KERNEL); | |
601 | if (dst->val == 0UL) | |
602 | return -ENOMEM; | |
603 | memcpy((void *) dst->val, RTA_DATA(rta), len); | |
604 | dst->len = len; | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static void meta_var_destroy(struct meta_value *v) | |
609 | { | |
610 | if (v->val) | |
611 | kfree((void *) v->val); | |
612 | } | |
613 | ||
614 | static void meta_var_apply_extras(struct meta_value *v, | |
615 | struct meta_obj *dst) | |
616 | { | |
617 | int shift = v->hdr.shift; | |
618 | ||
619 | if (shift && shift < dst->len) | |
620 | dst->len -= shift; | |
621 | } | |
622 | ||
623 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
624 | { | |
625 | if (v->val && v->len) | |
626 | RTA_PUT(skb, tlv, v->len, (void *) v->val); | |
627 | return 0; | |
628 | ||
629 | rtattr_failure: | |
630 | return -1; | |
631 | } | |
632 | ||
633 | /************************************************************************** | |
634 | * Type specific operations for TCF_META_TYPE_INT | |
635 | **************************************************************************/ | |
636 | ||
637 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
638 | { | |
639 | /* Let gcc optimize it, the unlikely is not really based on | |
640 | * some numbers but jump free code for mismatches seems | |
641 | * more logical. */ | |
642 | if (unlikely(a == b)) | |
643 | return 0; | |
644 | else if (a < b) | |
645 | return -1; | |
646 | else | |
647 | return 1; | |
648 | } | |
649 | ||
650 | static int meta_int_change(struct meta_value *dst, struct rtattr *rta) | |
651 | { | |
652 | if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) { | |
653 | dst->val = *(unsigned long *) RTA_DATA(rta); | |
654 | dst->len = sizeof(unsigned long); | |
655 | } else if (RTA_PAYLOAD(rta) == sizeof(u32)) { | |
656 | dst->val = *(u32 *) RTA_DATA(rta); | |
657 | dst->len = sizeof(u32); | |
658 | } else | |
659 | return -EINVAL; | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | static void meta_int_apply_extras(struct meta_value *v, | |
665 | struct meta_obj *dst) | |
666 | { | |
667 | if (v->hdr.shift) | |
668 | dst->value >>= v->hdr.shift; | |
669 | ||
670 | if (v->val) | |
671 | dst->value &= v->val; | |
672 | } | |
673 | ||
674 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
675 | { | |
676 | if (v->len == sizeof(unsigned long)) | |
677 | RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val); | |
678 | else if (v->len == sizeof(u32)) { | |
679 | u32 d = v->val; | |
680 | RTA_PUT(skb, tlv, sizeof(d), &d); | |
681 | } | |
682 | ||
683 | return 0; | |
684 | ||
685 | rtattr_failure: | |
686 | return -1; | |
687 | } | |
688 | ||
689 | /************************************************************************** | |
690 | * Type specific operations table | |
691 | **************************************************************************/ | |
692 | ||
693 | struct meta_type_ops | |
694 | { | |
695 | void (*destroy)(struct meta_value *); | |
696 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
697 | int (*change)(struct meta_value *, struct rtattr *); | |
698 | void (*apply_extras)(struct meta_value *, struct meta_obj *); | |
699 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
700 | }; | |
701 | ||
702 | static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = { | |
703 | [TCF_META_TYPE_VAR] = { | |
704 | .destroy = meta_var_destroy, | |
705 | .compare = meta_var_compare, | |
706 | .change = meta_var_change, | |
707 | .apply_extras = meta_var_apply_extras, | |
708 | .dump = meta_var_dump | |
709 | }, | |
710 | [TCF_META_TYPE_INT] = { | |
711 | .compare = meta_int_compare, | |
712 | .change = meta_int_change, | |
713 | .apply_extras = meta_int_apply_extras, | |
714 | .dump = meta_int_dump | |
715 | } | |
716 | }; | |
717 | ||
718 | static inline struct meta_type_ops * meta_type_ops(struct meta_value *v) | |
719 | { | |
720 | return &__meta_type_ops[meta_type(v)]; | |
721 | } | |
722 | ||
723 | /************************************************************************** | |
724 | * Core | |
725 | **************************************************************************/ | |
726 | ||
727 | static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, | |
728 | struct meta_value *v, struct meta_obj *dst) | |
729 | { | |
730 | int err = 0; | |
731 | ||
732 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
733 | dst->value = v->val; | |
734 | dst->len = v->len; | |
735 | return 0; | |
736 | } | |
737 | ||
738 | meta_ops(v)->get(skb, info, v, dst, &err); | |
739 | if (err < 0) | |
740 | return err; | |
741 | ||
742 | if (meta_type_ops(v)->apply_extras) | |
743 | meta_type_ops(v)->apply_extras(v, dst); | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
748 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
749 | struct tcf_pkt_info *info) | |
750 | { | |
751 | int r; | |
752 | struct meta_match *meta = (struct meta_match *) m->data; | |
753 | struct meta_obj l_value, r_value; | |
754 | ||
755 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
756 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
757 | return 0; | |
758 | ||
759 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
760 | ||
761 | switch (meta->lvalue.hdr.op) { | |
762 | case TCF_EM_OPND_EQ: | |
763 | return !r; | |
764 | case TCF_EM_OPND_LT: | |
765 | return r < 0; | |
766 | case TCF_EM_OPND_GT: | |
767 | return r > 0; | |
768 | } | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
773 | static inline void meta_delete(struct meta_match *meta) | |
774 | { | |
775 | struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
776 | ||
777 | if (ops && ops->destroy) { | |
778 | ops->destroy(&meta->lvalue); | |
779 | ops->destroy(&meta->rvalue); | |
780 | } | |
781 | ||
782 | kfree(meta); | |
783 | } | |
784 | ||
785 | static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta) | |
786 | { | |
787 | if (rta) { | |
788 | if (RTA_PAYLOAD(rta) == 0) | |
789 | return -EINVAL; | |
790 | ||
791 | return meta_type_ops(dst)->change(dst, rta); | |
792 | } | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | static inline int meta_is_supported(struct meta_value *val) | |
798 | { | |
799 | return (!meta_id(val) || meta_ops(val)->get); | |
800 | } | |
801 | ||
802 | static int em_meta_change(struct tcf_proto *tp, void *data, int len, | |
803 | struct tcf_ematch *m) | |
804 | { | |
805 | int err = -EINVAL; | |
806 | struct rtattr *tb[TCA_EM_META_MAX]; | |
807 | struct tcf_meta_hdr *hdr; | |
808 | struct meta_match *meta = NULL; | |
809 | ||
810 | if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0) | |
811 | goto errout; | |
812 | ||
813 | if (tb[TCA_EM_META_HDR-1] == NULL || | |
814 | RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr)) | |
815 | goto errout; | |
816 | hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]); | |
817 | ||
818 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
819 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
820 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
821 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
822 | goto errout; | |
823 | ||
824 | meta = kmalloc(sizeof(*meta), GFP_KERNEL); | |
825 | if (meta == NULL) | |
826 | goto errout; | |
827 | memset(meta, 0, sizeof(*meta)); | |
828 | ||
829 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
830 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
831 | ||
832 | if (!meta_is_supported(&meta->lvalue) || | |
833 | !meta_is_supported(&meta->rvalue)) { | |
834 | err = -EOPNOTSUPP; | |
835 | goto errout; | |
836 | } | |
837 | ||
838 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 || | |
839 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0) | |
840 | goto errout; | |
841 | ||
842 | m->datalen = sizeof(*meta); | |
843 | m->data = (unsigned long) meta; | |
844 | ||
845 | err = 0; | |
846 | errout: | |
847 | if (err && meta) | |
848 | meta_delete(meta); | |
849 | return err; | |
850 | } | |
851 | ||
852 | static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m) | |
853 | { | |
854 | if (m) | |
855 | meta_delete((struct meta_match *) m->data); | |
856 | } | |
857 | ||
858 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
859 | { | |
860 | struct meta_match *meta = (struct meta_match *) em->data; | |
861 | struct tcf_meta_hdr hdr; | |
862 | struct meta_type_ops *ops; | |
863 | ||
864 | memset(&hdr, 0, sizeof(hdr)); | |
865 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
866 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
867 | ||
868 | RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr); | |
869 | ||
870 | ops = meta_type_ops(&meta->lvalue); | |
871 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
872 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
873 | goto rtattr_failure; | |
874 | ||
875 | return 0; | |
876 | ||
877 | rtattr_failure: | |
878 | return -1; | |
879 | } | |
880 | ||
881 | static struct tcf_ematch_ops em_meta_ops = { | |
882 | .kind = TCF_EM_META, | |
883 | .change = em_meta_change, | |
884 | .match = em_meta_match, | |
885 | .destroy = em_meta_destroy, | |
886 | .dump = em_meta_dump, | |
887 | .owner = THIS_MODULE, | |
888 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
889 | }; | |
890 | ||
891 | static int __init init_em_meta(void) | |
892 | { | |
893 | return tcf_em_register(&em_meta_ops); | |
894 | } | |
895 | ||
896 | static void __exit exit_em_meta(void) | |
897 | { | |
898 | tcf_em_unregister(&em_meta_ops); | |
899 | } | |
900 | ||
901 | MODULE_LICENSE("GPL"); | |
902 | ||
903 | module_init(init_em_meta); | |
904 | module_exit(exit_em_meta); |