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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 | * ========================================================================== | |
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 | | |
261688d0 | 30 | * def | id: DEV | | id: VALUE | |
1da177e4 LT |
31 | * | data: | | data: 3 | |
32 | * +-----------+ +-----------+ | |
33 | * | | | |
261688d0 | 34 | * ---> meta_ops[INT][DEV](...) | |
48900629 | 35 | * | | |
1da177e4 LT |
36 | * ----------- | |
37 | * V V | |
38 | * +-----------+ +-----------+ | |
39 | * | type: INT | | type: INT | | |
261688d0 | 40 | * obj | id: DEV | | id: VALUE | |
1da177e4 LT |
41 | * | data: 2 |<--data got filled out | data: 3 | |
42 | * +-----------+ +-----------+ | |
43 | * | | | |
44 | * --------------> 2 equals 3 <-------------- | |
45 | * | |
46 | * This is a simplified schema, the complexity varies depending | |
47 | * on the meta type. Obviously, the length of the data must also | |
48 | * be provided for non-numeric types. | |
49 | * | |
50 | * Additionaly, type dependant modifiers such as shift operators | |
51 | * or mask may be applied to extend the functionaliy. As of now, | |
52 | * the variable length type supports shifting the byte string to | |
53 | * the right, eating up any number of octets and thus supporting | |
54 | * wildcard interface name comparisons such as "ppp%" matching | |
55 | * ppp0..9. | |
56 | * | |
57 | * NOTE: Certain meta values depend on other subsystems and are | |
58 | * only available if that subsytem is enabled in the kernel. | |
59 | */ | |
60 | ||
1da177e4 LT |
61 | #include <linux/module.h> |
62 | #include <linux/types.h> | |
63 | #include <linux/kernel.h> | |
64 | #include <linux/sched.h> | |
65 | #include <linux/string.h> | |
66 | #include <linux/skbuff.h> | |
67 | #include <linux/random.h> | |
68 | #include <linux/tc_ematch/tc_em_meta.h> | |
69 | #include <net/dst.h> | |
70 | #include <net/route.h> | |
71 | #include <net/pkt_cls.h> | |
48900629 | 72 | #include <net/sock.h> |
1da177e4 LT |
73 | |
74 | struct meta_obj | |
75 | { | |
76 | unsigned long value; | |
77 | unsigned int len; | |
78 | }; | |
79 | ||
80 | struct meta_value | |
81 | { | |
82 | struct tcf_meta_val hdr; | |
83 | unsigned long val; | |
84 | unsigned int len; | |
85 | }; | |
86 | ||
87 | struct meta_match | |
88 | { | |
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 | ||
1da177e4 LT |
172 | /************************************************************************** |
173 | * skb attributes | |
174 | **************************************************************************/ | |
175 | ||
176 | META_COLLECTOR(int_priority) | |
177 | { | |
178 | dst->value = skb->priority; | |
179 | } | |
180 | ||
181 | META_COLLECTOR(int_protocol) | |
182 | { | |
183 | /* Let userspace take care of the byte ordering */ | |
184 | dst->value = skb->protocol; | |
185 | } | |
186 | ||
1da177e4 LT |
187 | META_COLLECTOR(int_pkttype) |
188 | { | |
189 | dst->value = skb->pkt_type; | |
190 | } | |
191 | ||
192 | META_COLLECTOR(int_pktlen) | |
193 | { | |
194 | dst->value = skb->len; | |
195 | } | |
196 | ||
197 | META_COLLECTOR(int_datalen) | |
198 | { | |
199 | dst->value = skb->data_len; | |
200 | } | |
201 | ||
202 | META_COLLECTOR(int_maclen) | |
203 | { | |
204 | dst->value = skb->mac_len; | |
205 | } | |
206 | ||
207 | /************************************************************************** | |
208 | * Netfilter | |
209 | **************************************************************************/ | |
210 | ||
82e91ffe | 211 | META_COLLECTOR(int_mark) |
1da177e4 | 212 | { |
82e91ffe | 213 | dst->value = skb->mark; |
7686ee1a | 214 | } |
1da177e4 LT |
215 | |
216 | /************************************************************************** | |
217 | * Traffic Control | |
218 | **************************************************************************/ | |
219 | ||
220 | META_COLLECTOR(int_tcindex) | |
221 | { | |
222 | dst->value = skb->tc_index; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | /************************************************************************** |
226 | * Routing | |
227 | **************************************************************************/ | |
228 | ||
1da177e4 LT |
229 | META_COLLECTOR(int_rtclassid) |
230 | { | |
231 | if (unlikely(skb->dst == NULL)) | |
232 | *err = -1; | |
233 | else | |
7686ee1a | 234 | #ifdef CONFIG_NET_CLS_ROUTE |
1da177e4 | 235 | dst->value = skb->dst->tclassid; |
7686ee1a PM |
236 | #else |
237 | dst->value = 0; | |
1da177e4 | 238 | #endif |
7686ee1a | 239 | } |
1da177e4 LT |
240 | |
241 | META_COLLECTOR(int_rtiif) | |
242 | { | |
243 | if (unlikely(skb->dst == NULL)) | |
244 | *err = -1; | |
245 | else | |
246 | dst->value = ((struct rtable*) skb->dst)->fl.iif; | |
247 | } | |
248 | ||
48900629 TG |
249 | /************************************************************************** |
250 | * Socket Attributes | |
251 | **************************************************************************/ | |
252 | ||
253 | #define SKIP_NONLOCAL(skb) \ | |
254 | if (unlikely(skb->sk == NULL)) { \ | |
255 | *err = -1; \ | |
256 | return; \ | |
257 | } | |
258 | ||
259 | META_COLLECTOR(int_sk_family) | |
260 | { | |
261 | SKIP_NONLOCAL(skb); | |
262 | dst->value = skb->sk->sk_family; | |
263 | } | |
264 | ||
265 | META_COLLECTOR(int_sk_state) | |
266 | { | |
267 | SKIP_NONLOCAL(skb); | |
268 | dst->value = skb->sk->sk_state; | |
269 | } | |
270 | ||
271 | META_COLLECTOR(int_sk_reuse) | |
272 | { | |
273 | SKIP_NONLOCAL(skb); | |
274 | dst->value = skb->sk->sk_reuse; | |
275 | } | |
276 | ||
277 | META_COLLECTOR(int_sk_bound_if) | |
278 | { | |
279 | SKIP_NONLOCAL(skb); | |
280 | /* No error if bound_dev_if is 0, legal userspace check */ | |
281 | dst->value = skb->sk->sk_bound_dev_if; | |
282 | } | |
283 | ||
284 | META_COLLECTOR(var_sk_bound_if) | |
285 | { | |
286 | SKIP_NONLOCAL(skb); | |
287 | ||
288 | if (skb->sk->sk_bound_dev_if == 0) { | |
289 | dst->value = (unsigned long) "any"; | |
290 | dst->len = 3; | |
291 | } else { | |
292 | struct net_device *dev; | |
293 | ||
294 | dev = dev_get_by_index(skb->sk->sk_bound_dev_if); | |
295 | *err = var_dev(dev, dst); | |
296 | if (dev) | |
297 | dev_put(dev); | |
298 | } | |
299 | } | |
300 | ||
301 | META_COLLECTOR(int_sk_refcnt) | |
302 | { | |
303 | SKIP_NONLOCAL(skb); | |
304 | dst->value = atomic_read(&skb->sk->sk_refcnt); | |
305 | } | |
306 | ||
307 | META_COLLECTOR(int_sk_rcvbuf) | |
308 | { | |
309 | SKIP_NONLOCAL(skb); | |
310 | dst->value = skb->sk->sk_rcvbuf; | |
311 | } | |
312 | ||
313 | META_COLLECTOR(int_sk_shutdown) | |
314 | { | |
315 | SKIP_NONLOCAL(skb); | |
316 | dst->value = skb->sk->sk_shutdown; | |
317 | } | |
318 | ||
319 | META_COLLECTOR(int_sk_proto) | |
320 | { | |
321 | SKIP_NONLOCAL(skb); | |
322 | dst->value = skb->sk->sk_protocol; | |
323 | } | |
324 | ||
325 | META_COLLECTOR(int_sk_type) | |
326 | { | |
327 | SKIP_NONLOCAL(skb); | |
328 | dst->value = skb->sk->sk_type; | |
329 | } | |
330 | ||
331 | META_COLLECTOR(int_sk_rmem_alloc) | |
332 | { | |
333 | SKIP_NONLOCAL(skb); | |
334 | dst->value = atomic_read(&skb->sk->sk_rmem_alloc); | |
335 | } | |
336 | ||
337 | META_COLLECTOR(int_sk_wmem_alloc) | |
338 | { | |
339 | SKIP_NONLOCAL(skb); | |
340 | dst->value = atomic_read(&skb->sk->sk_wmem_alloc); | |
341 | } | |
342 | ||
343 | META_COLLECTOR(int_sk_omem_alloc) | |
344 | { | |
345 | SKIP_NONLOCAL(skb); | |
346 | dst->value = atomic_read(&skb->sk->sk_omem_alloc); | |
347 | } | |
348 | ||
349 | META_COLLECTOR(int_sk_rcv_qlen) | |
350 | { | |
351 | SKIP_NONLOCAL(skb); | |
352 | dst->value = skb->sk->sk_receive_queue.qlen; | |
353 | } | |
354 | ||
355 | META_COLLECTOR(int_sk_snd_qlen) | |
356 | { | |
357 | SKIP_NONLOCAL(skb); | |
358 | dst->value = skb->sk->sk_write_queue.qlen; | |
359 | } | |
360 | ||
361 | META_COLLECTOR(int_sk_wmem_queued) | |
362 | { | |
363 | SKIP_NONLOCAL(skb); | |
364 | dst->value = skb->sk->sk_wmem_queued; | |
365 | } | |
366 | ||
367 | META_COLLECTOR(int_sk_fwd_alloc) | |
368 | { | |
369 | SKIP_NONLOCAL(skb); | |
370 | dst->value = skb->sk->sk_forward_alloc; | |
371 | } | |
372 | ||
373 | META_COLLECTOR(int_sk_sndbuf) | |
374 | { | |
375 | SKIP_NONLOCAL(skb); | |
376 | dst->value = skb->sk->sk_sndbuf; | |
377 | } | |
378 | ||
379 | META_COLLECTOR(int_sk_alloc) | |
380 | { | |
381 | SKIP_NONLOCAL(skb); | |
382 | dst->value = skb->sk->sk_allocation; | |
383 | } | |
384 | ||
385 | META_COLLECTOR(int_sk_route_caps) | |
386 | { | |
387 | SKIP_NONLOCAL(skb); | |
388 | dst->value = skb->sk->sk_route_caps; | |
389 | } | |
390 | ||
81c3d547 | 391 | META_COLLECTOR(int_sk_hash) |
48900629 TG |
392 | { |
393 | SKIP_NONLOCAL(skb); | |
81c3d547 | 394 | dst->value = skb->sk->sk_hash; |
48900629 TG |
395 | } |
396 | ||
397 | META_COLLECTOR(int_sk_lingertime) | |
398 | { | |
399 | SKIP_NONLOCAL(skb); | |
400 | dst->value = skb->sk->sk_lingertime / HZ; | |
401 | } | |
402 | ||
403 | META_COLLECTOR(int_sk_err_qlen) | |
404 | { | |
405 | SKIP_NONLOCAL(skb); | |
406 | dst->value = skb->sk->sk_error_queue.qlen; | |
407 | } | |
408 | ||
409 | META_COLLECTOR(int_sk_ack_bl) | |
410 | { | |
411 | SKIP_NONLOCAL(skb); | |
412 | dst->value = skb->sk->sk_ack_backlog; | |
413 | } | |
414 | ||
415 | META_COLLECTOR(int_sk_max_ack_bl) | |
416 | { | |
417 | SKIP_NONLOCAL(skb); | |
418 | dst->value = skb->sk->sk_max_ack_backlog; | |
419 | } | |
420 | ||
421 | META_COLLECTOR(int_sk_prio) | |
422 | { | |
423 | SKIP_NONLOCAL(skb); | |
424 | dst->value = skb->sk->sk_priority; | |
425 | } | |
426 | ||
427 | META_COLLECTOR(int_sk_rcvlowat) | |
428 | { | |
429 | SKIP_NONLOCAL(skb); | |
430 | dst->value = skb->sk->sk_rcvlowat; | |
431 | } | |
432 | ||
433 | META_COLLECTOR(int_sk_rcvtimeo) | |
434 | { | |
435 | SKIP_NONLOCAL(skb); | |
436 | dst->value = skb->sk->sk_rcvtimeo / HZ; | |
437 | } | |
438 | ||
439 | META_COLLECTOR(int_sk_sndtimeo) | |
440 | { | |
441 | SKIP_NONLOCAL(skb); | |
442 | dst->value = skb->sk->sk_sndtimeo / HZ; | |
443 | } | |
444 | ||
445 | META_COLLECTOR(int_sk_sendmsg_off) | |
446 | { | |
447 | SKIP_NONLOCAL(skb); | |
448 | dst->value = skb->sk->sk_sndmsg_off; | |
449 | } | |
450 | ||
451 | META_COLLECTOR(int_sk_write_pend) | |
452 | { | |
453 | SKIP_NONLOCAL(skb); | |
454 | dst->value = skb->sk->sk_write_pending; | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /************************************************************************** |
458 | * Meta value collectors assignment table | |
459 | **************************************************************************/ | |
460 | ||
461 | struct meta_ops | |
462 | { | |
463 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, | |
464 | struct meta_value *, struct meta_obj *, int *); | |
465 | }; | |
466 | ||
48900629 TG |
467 | #define META_ID(name) TCF_META_ID_##name |
468 | #define META_FUNC(name) { .get = meta_##name } | |
469 | ||
1da177e4 LT |
470 | /* Meta value operations table listing all meta value collectors and |
471 | * assigns them to a type and meta id. */ | |
472 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = { | |
473 | [TCF_META_TYPE_VAR] = { | |
48900629 | 474 | [META_ID(DEV)] = META_FUNC(var_dev), |
48900629 | 475 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
1da177e4 LT |
476 | }, |
477 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
478 | [META_ID(RANDOM)] = META_FUNC(int_random), |
479 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
480 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
481 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
482 | [META_ID(DEV)] = META_FUNC(int_dev), | |
48900629 TG |
483 | [META_ID(PRIORITY)] = META_FUNC(int_priority), |
484 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
48900629 TG |
485 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), |
486 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
487 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
488 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
82e91ffe | 489 | [META_ID(NFMARK)] = META_FUNC(int_mark), |
48900629 | 490 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
48900629 | 491 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
48900629 TG |
492 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
493 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
494 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
495 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
496 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
497 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
498 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
499 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
500 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
501 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
502 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
503 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
504 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
505 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
506 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
507 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
508 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
509 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
510 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
511 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
512 | [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps), | |
81c3d547 | 513 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
48900629 TG |
514 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), |
515 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
516 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
517 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
518 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
519 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
520 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
521 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
522 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
1da177e4 LT |
523 | } |
524 | }; | |
525 | ||
526 | static inline struct meta_ops * meta_ops(struct meta_value *val) | |
527 | { | |
528 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
529 | } | |
530 | ||
531 | /************************************************************************** | |
532 | * Type specific operations for TCF_META_TYPE_VAR | |
533 | **************************************************************************/ | |
534 | ||
535 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
536 | { | |
537 | int r = a->len - b->len; | |
538 | ||
539 | if (r == 0) | |
540 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
541 | ||
542 | return r; | |
543 | } | |
544 | ||
545 | static int meta_var_change(struct meta_value *dst, struct rtattr *rta) | |
546 | { | |
547 | int len = RTA_PAYLOAD(rta); | |
548 | ||
c7b1b249 | 549 | dst->val = (unsigned long)kmemdup(RTA_DATA(rta), len, GFP_KERNEL); |
1da177e4 LT |
550 | if (dst->val == 0UL) |
551 | return -ENOMEM; | |
1da177e4 LT |
552 | dst->len = len; |
553 | return 0; | |
554 | } | |
555 | ||
556 | static void meta_var_destroy(struct meta_value *v) | |
557 | { | |
a51482bd | 558 | kfree((void *) v->val); |
1da177e4 LT |
559 | } |
560 | ||
561 | static void meta_var_apply_extras(struct meta_value *v, | |
562 | struct meta_obj *dst) | |
563 | { | |
564 | int shift = v->hdr.shift; | |
565 | ||
566 | if (shift && shift < dst->len) | |
567 | dst->len -= shift; | |
568 | } | |
569 | ||
570 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
571 | { | |
572 | if (v->val && v->len) | |
573 | RTA_PUT(skb, tlv, v->len, (void *) v->val); | |
574 | return 0; | |
575 | ||
576 | rtattr_failure: | |
577 | return -1; | |
578 | } | |
579 | ||
580 | /************************************************************************** | |
581 | * Type specific operations for TCF_META_TYPE_INT | |
582 | **************************************************************************/ | |
583 | ||
584 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
585 | { | |
586 | /* Let gcc optimize it, the unlikely is not really based on | |
587 | * some numbers but jump free code for mismatches seems | |
588 | * more logical. */ | |
98e56405 | 589 | if (unlikely(a->value == b->value)) |
1da177e4 | 590 | return 0; |
98e56405 | 591 | else if (a->value < b->value) |
1da177e4 LT |
592 | return -1; |
593 | else | |
594 | return 1; | |
595 | } | |
596 | ||
597 | static int meta_int_change(struct meta_value *dst, struct rtattr *rta) | |
598 | { | |
599 | if (RTA_PAYLOAD(rta) >= sizeof(unsigned long)) { | |
600 | dst->val = *(unsigned long *) RTA_DATA(rta); | |
601 | dst->len = sizeof(unsigned long); | |
602 | } else if (RTA_PAYLOAD(rta) == sizeof(u32)) { | |
603 | dst->val = *(u32 *) RTA_DATA(rta); | |
604 | dst->len = sizeof(u32); | |
605 | } else | |
606 | return -EINVAL; | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | static void meta_int_apply_extras(struct meta_value *v, | |
612 | struct meta_obj *dst) | |
613 | { | |
614 | if (v->hdr.shift) | |
615 | dst->value >>= v->hdr.shift; | |
616 | ||
617 | if (v->val) | |
618 | dst->value &= v->val; | |
619 | } | |
620 | ||
621 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
622 | { | |
623 | if (v->len == sizeof(unsigned long)) | |
624 | RTA_PUT(skb, tlv, sizeof(unsigned long), &v->val); | |
625 | else if (v->len == sizeof(u32)) { | |
626 | u32 d = v->val; | |
627 | RTA_PUT(skb, tlv, sizeof(d), &d); | |
628 | } | |
629 | ||
630 | return 0; | |
631 | ||
632 | rtattr_failure: | |
633 | return -1; | |
634 | } | |
635 | ||
636 | /************************************************************************** | |
637 | * Type specific operations table | |
638 | **************************************************************************/ | |
639 | ||
640 | struct meta_type_ops | |
641 | { | |
642 | void (*destroy)(struct meta_value *); | |
643 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
644 | int (*change)(struct meta_value *, struct rtattr *); | |
645 | void (*apply_extras)(struct meta_value *, struct meta_obj *); | |
646 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
647 | }; | |
648 | ||
649 | static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = { | |
650 | [TCF_META_TYPE_VAR] = { | |
651 | .destroy = meta_var_destroy, | |
652 | .compare = meta_var_compare, | |
653 | .change = meta_var_change, | |
654 | .apply_extras = meta_var_apply_extras, | |
655 | .dump = meta_var_dump | |
656 | }, | |
657 | [TCF_META_TYPE_INT] = { | |
658 | .compare = meta_int_compare, | |
659 | .change = meta_int_change, | |
660 | .apply_extras = meta_int_apply_extras, | |
661 | .dump = meta_int_dump | |
662 | } | |
663 | }; | |
664 | ||
665 | static inline struct meta_type_ops * meta_type_ops(struct meta_value *v) | |
666 | { | |
667 | return &__meta_type_ops[meta_type(v)]; | |
668 | } | |
669 | ||
670 | /************************************************************************** | |
671 | * Core | |
672 | **************************************************************************/ | |
673 | ||
674 | static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, | |
675 | struct meta_value *v, struct meta_obj *dst) | |
676 | { | |
677 | int err = 0; | |
678 | ||
679 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
680 | dst->value = v->val; | |
681 | dst->len = v->len; | |
682 | return 0; | |
683 | } | |
684 | ||
685 | meta_ops(v)->get(skb, info, v, dst, &err); | |
686 | if (err < 0) | |
687 | return err; | |
688 | ||
689 | if (meta_type_ops(v)->apply_extras) | |
690 | meta_type_ops(v)->apply_extras(v, dst); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
696 | struct tcf_pkt_info *info) | |
697 | { | |
698 | int r; | |
699 | struct meta_match *meta = (struct meta_match *) m->data; | |
700 | struct meta_obj l_value, r_value; | |
701 | ||
702 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
703 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
704 | return 0; | |
705 | ||
706 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
707 | ||
708 | switch (meta->lvalue.hdr.op) { | |
709 | case TCF_EM_OPND_EQ: | |
710 | return !r; | |
711 | case TCF_EM_OPND_LT: | |
712 | return r < 0; | |
713 | case TCF_EM_OPND_GT: | |
714 | return r > 0; | |
715 | } | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
720 | static inline void meta_delete(struct meta_match *meta) | |
721 | { | |
722 | struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
723 | ||
724 | if (ops && ops->destroy) { | |
725 | ops->destroy(&meta->lvalue); | |
726 | ops->destroy(&meta->rvalue); | |
727 | } | |
728 | ||
729 | kfree(meta); | |
730 | } | |
731 | ||
732 | static inline int meta_change_data(struct meta_value *dst, struct rtattr *rta) | |
733 | { | |
734 | if (rta) { | |
735 | if (RTA_PAYLOAD(rta) == 0) | |
736 | return -EINVAL; | |
737 | ||
738 | return meta_type_ops(dst)->change(dst, rta); | |
739 | } | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | static inline int meta_is_supported(struct meta_value *val) | |
745 | { | |
746 | return (!meta_id(val) || meta_ops(val)->get); | |
747 | } | |
748 | ||
749 | static int em_meta_change(struct tcf_proto *tp, void *data, int len, | |
750 | struct tcf_ematch *m) | |
751 | { | |
752 | int err = -EINVAL; | |
753 | struct rtattr *tb[TCA_EM_META_MAX]; | |
754 | struct tcf_meta_hdr *hdr; | |
755 | struct meta_match *meta = NULL; | |
756 | ||
757 | if (rtattr_parse(tb, TCA_EM_META_MAX, data, len) < 0) | |
758 | goto errout; | |
759 | ||
760 | if (tb[TCA_EM_META_HDR-1] == NULL || | |
761 | RTA_PAYLOAD(tb[TCA_EM_META_HDR-1]) < sizeof(*hdr)) | |
762 | goto errout; | |
763 | hdr = RTA_DATA(tb[TCA_EM_META_HDR-1]); | |
764 | ||
765 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
766 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
767 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
768 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
769 | goto errout; | |
770 | ||
0da974f4 | 771 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
1da177e4 LT |
772 | if (meta == NULL) |
773 | goto errout; | |
1da177e4 LT |
774 | |
775 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
776 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
777 | ||
778 | if (!meta_is_supported(&meta->lvalue) || | |
779 | !meta_is_supported(&meta->rvalue)) { | |
780 | err = -EOPNOTSUPP; | |
781 | goto errout; | |
782 | } | |
783 | ||
784 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE-1]) < 0 || | |
785 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE-1]) < 0) | |
786 | goto errout; | |
787 | ||
788 | m->datalen = sizeof(*meta); | |
789 | m->data = (unsigned long) meta; | |
790 | ||
791 | err = 0; | |
792 | errout: | |
793 | if (err && meta) | |
794 | meta_delete(meta); | |
795 | return err; | |
796 | } | |
797 | ||
798 | static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m) | |
799 | { | |
800 | if (m) | |
801 | meta_delete((struct meta_match *) m->data); | |
802 | } | |
803 | ||
804 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
805 | { | |
806 | struct meta_match *meta = (struct meta_match *) em->data; | |
807 | struct tcf_meta_hdr hdr; | |
808 | struct meta_type_ops *ops; | |
809 | ||
810 | memset(&hdr, 0, sizeof(hdr)); | |
811 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
812 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
813 | ||
814 | RTA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr); | |
815 | ||
816 | ops = meta_type_ops(&meta->lvalue); | |
817 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
818 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
819 | goto rtattr_failure; | |
820 | ||
821 | return 0; | |
822 | ||
823 | rtattr_failure: | |
824 | return -1; | |
825 | } | |
826 | ||
827 | static struct tcf_ematch_ops em_meta_ops = { | |
828 | .kind = TCF_EM_META, | |
829 | .change = em_meta_change, | |
830 | .match = em_meta_match, | |
831 | .destroy = em_meta_destroy, | |
832 | .dump = em_meta_dump, | |
833 | .owner = THIS_MODULE, | |
834 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
835 | }; | |
836 | ||
837 | static int __init init_em_meta(void) | |
838 | { | |
839 | return tcf_em_register(&em_meta_ops); | |
840 | } | |
841 | ||
842 | static void __exit exit_em_meta(void) | |
843 | { | |
844 | tcf_em_unregister(&em_meta_ops); | |
845 | } | |
846 | ||
847 | MODULE_LICENSE("GPL"); | |
848 | ||
849 | module_init(init_em_meta); | |
850 | module_exit(exit_em_meta); |