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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 | * | |
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 | |
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 LT |
75 | |
76 | struct meta_obj | |
77 | { | |
78 | unsigned long value; | |
79 | unsigned int len; | |
80 | }; | |
81 | ||
82 | struct meta_value | |
83 | { | |
84 | struct tcf_meta_val hdr; | |
85 | unsigned long val; | |
86 | unsigned int len; | |
87 | }; | |
88 | ||
89 | struct meta_match | |
90 | { | |
91 | struct meta_value lvalue; | |
92 | struct meta_value rvalue; | |
93 | }; | |
94 | ||
95 | static inline int meta_id(struct meta_value *v) | |
96 | { | |
97 | return TCF_META_ID(v->hdr.kind); | |
98 | } | |
99 | ||
100 | static inline int meta_type(struct meta_value *v) | |
101 | { | |
102 | return TCF_META_TYPE(v->hdr.kind); | |
103 | } | |
104 | ||
105 | #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \ | |
106 | struct tcf_pkt_info *info, struct meta_value *v, \ | |
107 | struct meta_obj *dst, int *err) | |
108 | ||
109 | /************************************************************************** | |
110 | * System status & misc | |
111 | **************************************************************************/ | |
112 | ||
113 | META_COLLECTOR(int_random) | |
114 | { | |
115 | get_random_bytes(&dst->value, sizeof(dst->value)); | |
116 | } | |
117 | ||
118 | static inline unsigned long fixed_loadavg(int load) | |
119 | { | |
120 | int rnd_load = load + (FIXED_1/200); | |
121 | int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT; | |
122 | ||
123 | return ((rnd_load >> FSHIFT) * 100) + rnd_frac; | |
124 | } | |
125 | ||
126 | META_COLLECTOR(int_loadavg_0) | |
127 | { | |
128 | dst->value = fixed_loadavg(avenrun[0]); | |
129 | } | |
130 | ||
131 | META_COLLECTOR(int_loadavg_1) | |
132 | { | |
133 | dst->value = fixed_loadavg(avenrun[1]); | |
134 | } | |
135 | ||
136 | META_COLLECTOR(int_loadavg_2) | |
137 | { | |
138 | dst->value = fixed_loadavg(avenrun[2]); | |
139 | } | |
140 | ||
141 | /************************************************************************** | |
142 | * Device names & indices | |
143 | **************************************************************************/ | |
144 | ||
145 | static inline int int_dev(struct net_device *dev, struct meta_obj *dst) | |
146 | { | |
147 | if (unlikely(dev == NULL)) | |
148 | return -1; | |
149 | ||
150 | dst->value = dev->ifindex; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static inline int var_dev(struct net_device *dev, struct meta_obj *dst) | |
155 | { | |
156 | if (unlikely(dev == NULL)) | |
157 | return -1; | |
158 | ||
159 | dst->value = (unsigned long) dev->name; | |
160 | dst->len = strlen(dev->name); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | META_COLLECTOR(int_dev) | |
165 | { | |
166 | *err = int_dev(skb->dev, dst); | |
167 | } | |
168 | ||
169 | META_COLLECTOR(var_dev) | |
170 | { | |
171 | *err = var_dev(skb->dev, dst); | |
172 | } | |
173 | ||
3113e88c SH |
174 | /************************************************************************** |
175 | * vlan tag | |
176 | **************************************************************************/ | |
177 | ||
178 | META_COLLECTOR(int_vlan_tag) | |
179 | { | |
1a31f204 SH |
180 | unsigned short tag; |
181 | ||
182 | tag = vlan_tx_tag_get(skb); | |
183 | if (!tag && __vlan_get_tag(skb, &tag)) | |
3113e88c SH |
184 | *err = -1; |
185 | else | |
186 | dst->value = tag; | |
187 | } | |
188 | ||
189 | ||
190 | ||
1da177e4 LT |
191 | /************************************************************************** |
192 | * skb attributes | |
193 | **************************************************************************/ | |
194 | ||
195 | META_COLLECTOR(int_priority) | |
196 | { | |
197 | dst->value = skb->priority; | |
198 | } | |
199 | ||
200 | META_COLLECTOR(int_protocol) | |
201 | { | |
202 | /* Let userspace take care of the byte ordering */ | |
203 | dst->value = skb->protocol; | |
204 | } | |
205 | ||
1da177e4 LT |
206 | META_COLLECTOR(int_pkttype) |
207 | { | |
208 | dst->value = skb->pkt_type; | |
209 | } | |
210 | ||
211 | META_COLLECTOR(int_pktlen) | |
212 | { | |
213 | dst->value = skb->len; | |
214 | } | |
215 | ||
216 | META_COLLECTOR(int_datalen) | |
217 | { | |
218 | dst->value = skb->data_len; | |
219 | } | |
220 | ||
221 | META_COLLECTOR(int_maclen) | |
222 | { | |
223 | dst->value = skb->mac_len; | |
224 | } | |
225 | ||
c2e3143e SH |
226 | META_COLLECTOR(int_rxhash) |
227 | { | |
228 | dst->value = skb_get_rxhash(skb); | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /************************************************************************** |
232 | * Netfilter | |
233 | **************************************************************************/ | |
234 | ||
82e91ffe | 235 | META_COLLECTOR(int_mark) |
1da177e4 | 236 | { |
82e91ffe | 237 | dst->value = skb->mark; |
7686ee1a | 238 | } |
1da177e4 LT |
239 | |
240 | /************************************************************************** | |
241 | * Traffic Control | |
242 | **************************************************************************/ | |
243 | ||
244 | META_COLLECTOR(int_tcindex) | |
245 | { | |
246 | dst->value = skb->tc_index; | |
247 | } | |
248 | ||
1da177e4 LT |
249 | /************************************************************************** |
250 | * Routing | |
251 | **************************************************************************/ | |
252 | ||
1da177e4 LT |
253 | META_COLLECTOR(int_rtclassid) |
254 | { | |
adf30907 | 255 | if (unlikely(skb_dst(skb) == NULL)) |
1da177e4 LT |
256 | *err = -1; |
257 | else | |
7686ee1a | 258 | #ifdef CONFIG_NET_CLS_ROUTE |
adf30907 | 259 | dst->value = skb_dst(skb)->tclassid; |
7686ee1a PM |
260 | #else |
261 | dst->value = 0; | |
1da177e4 | 262 | #endif |
7686ee1a | 263 | } |
1da177e4 LT |
264 | |
265 | META_COLLECTOR(int_rtiif) | |
266 | { | |
511c3f92 | 267 | if (unlikely(skb_rtable(skb) == NULL)) |
1da177e4 LT |
268 | *err = -1; |
269 | else | |
511c3f92 | 270 | dst->value = skb_rtable(skb)->fl.iif; |
1da177e4 LT |
271 | } |
272 | ||
48900629 TG |
273 | /************************************************************************** |
274 | * Socket Attributes | |
275 | **************************************************************************/ | |
276 | ||
277 | #define SKIP_NONLOCAL(skb) \ | |
278 | if (unlikely(skb->sk == NULL)) { \ | |
279 | *err = -1; \ | |
280 | return; \ | |
281 | } | |
282 | ||
283 | META_COLLECTOR(int_sk_family) | |
284 | { | |
285 | SKIP_NONLOCAL(skb); | |
286 | dst->value = skb->sk->sk_family; | |
287 | } | |
288 | ||
289 | META_COLLECTOR(int_sk_state) | |
290 | { | |
291 | SKIP_NONLOCAL(skb); | |
292 | dst->value = skb->sk->sk_state; | |
293 | } | |
294 | ||
295 | META_COLLECTOR(int_sk_reuse) | |
296 | { | |
297 | SKIP_NONLOCAL(skb); | |
298 | dst->value = skb->sk->sk_reuse; | |
299 | } | |
300 | ||
301 | META_COLLECTOR(int_sk_bound_if) | |
302 | { | |
303 | SKIP_NONLOCAL(skb); | |
304 | /* No error if bound_dev_if is 0, legal userspace check */ | |
305 | dst->value = skb->sk->sk_bound_dev_if; | |
306 | } | |
307 | ||
308 | META_COLLECTOR(var_sk_bound_if) | |
309 | { | |
310 | SKIP_NONLOCAL(skb); | |
311 | ||
d0075634 | 312 | if (skb->sk->sk_bound_dev_if == 0) { |
48900629 TG |
313 | dst->value = (unsigned long) "any"; |
314 | dst->len = 3; | |
d0075634 | 315 | } else { |
48900629 | 316 | struct net_device *dev; |
10297b99 | 317 | |
d0075634 | 318 | rcu_read_lock(); |
2939e275 ED |
319 | dev = dev_get_by_index_rcu(sock_net(skb->sk), |
320 | skb->sk->sk_bound_dev_if); | |
48900629 | 321 | *err = var_dev(dev, dst); |
d0075634 ED |
322 | rcu_read_unlock(); |
323 | } | |
48900629 TG |
324 | } |
325 | ||
326 | META_COLLECTOR(int_sk_refcnt) | |
327 | { | |
328 | SKIP_NONLOCAL(skb); | |
329 | dst->value = atomic_read(&skb->sk->sk_refcnt); | |
330 | } | |
331 | ||
332 | META_COLLECTOR(int_sk_rcvbuf) | |
333 | { | |
334 | SKIP_NONLOCAL(skb); | |
335 | dst->value = skb->sk->sk_rcvbuf; | |
336 | } | |
337 | ||
338 | META_COLLECTOR(int_sk_shutdown) | |
339 | { | |
340 | SKIP_NONLOCAL(skb); | |
341 | dst->value = skb->sk->sk_shutdown; | |
342 | } | |
343 | ||
344 | META_COLLECTOR(int_sk_proto) | |
345 | { | |
346 | SKIP_NONLOCAL(skb); | |
347 | dst->value = skb->sk->sk_protocol; | |
348 | } | |
349 | ||
350 | META_COLLECTOR(int_sk_type) | |
351 | { | |
352 | SKIP_NONLOCAL(skb); | |
353 | dst->value = skb->sk->sk_type; | |
354 | } | |
355 | ||
356 | META_COLLECTOR(int_sk_rmem_alloc) | |
357 | { | |
358 | SKIP_NONLOCAL(skb); | |
31e6d363 | 359 | dst->value = sk_rmem_alloc_get(skb->sk); |
48900629 TG |
360 | } |
361 | ||
362 | META_COLLECTOR(int_sk_wmem_alloc) | |
363 | { | |
364 | SKIP_NONLOCAL(skb); | |
31e6d363 | 365 | dst->value = sk_wmem_alloc_get(skb->sk); |
48900629 TG |
366 | } |
367 | ||
368 | META_COLLECTOR(int_sk_omem_alloc) | |
369 | { | |
370 | SKIP_NONLOCAL(skb); | |
371 | dst->value = atomic_read(&skb->sk->sk_omem_alloc); | |
372 | } | |
373 | ||
374 | META_COLLECTOR(int_sk_rcv_qlen) | |
375 | { | |
376 | SKIP_NONLOCAL(skb); | |
377 | dst->value = skb->sk->sk_receive_queue.qlen; | |
378 | } | |
379 | ||
380 | META_COLLECTOR(int_sk_snd_qlen) | |
381 | { | |
382 | SKIP_NONLOCAL(skb); | |
383 | dst->value = skb->sk->sk_write_queue.qlen; | |
384 | } | |
385 | ||
386 | META_COLLECTOR(int_sk_wmem_queued) | |
387 | { | |
388 | SKIP_NONLOCAL(skb); | |
389 | dst->value = skb->sk->sk_wmem_queued; | |
390 | } | |
391 | ||
392 | META_COLLECTOR(int_sk_fwd_alloc) | |
393 | { | |
394 | SKIP_NONLOCAL(skb); | |
395 | dst->value = skb->sk->sk_forward_alloc; | |
396 | } | |
397 | ||
398 | META_COLLECTOR(int_sk_sndbuf) | |
399 | { | |
400 | SKIP_NONLOCAL(skb); | |
401 | dst->value = skb->sk->sk_sndbuf; | |
402 | } | |
403 | ||
404 | META_COLLECTOR(int_sk_alloc) | |
405 | { | |
406 | SKIP_NONLOCAL(skb); | |
407 | dst->value = skb->sk->sk_allocation; | |
408 | } | |
409 | ||
410 | META_COLLECTOR(int_sk_route_caps) | |
411 | { | |
412 | SKIP_NONLOCAL(skb); | |
413 | dst->value = skb->sk->sk_route_caps; | |
414 | } | |
415 | ||
81c3d547 | 416 | META_COLLECTOR(int_sk_hash) |
48900629 TG |
417 | { |
418 | SKIP_NONLOCAL(skb); | |
81c3d547 | 419 | dst->value = skb->sk->sk_hash; |
48900629 TG |
420 | } |
421 | ||
422 | META_COLLECTOR(int_sk_lingertime) | |
423 | { | |
424 | SKIP_NONLOCAL(skb); | |
425 | dst->value = skb->sk->sk_lingertime / HZ; | |
426 | } | |
427 | ||
428 | META_COLLECTOR(int_sk_err_qlen) | |
429 | { | |
430 | SKIP_NONLOCAL(skb); | |
431 | dst->value = skb->sk->sk_error_queue.qlen; | |
432 | } | |
433 | ||
434 | META_COLLECTOR(int_sk_ack_bl) | |
435 | { | |
436 | SKIP_NONLOCAL(skb); | |
437 | dst->value = skb->sk->sk_ack_backlog; | |
438 | } | |
439 | ||
440 | META_COLLECTOR(int_sk_max_ack_bl) | |
441 | { | |
442 | SKIP_NONLOCAL(skb); | |
443 | dst->value = skb->sk->sk_max_ack_backlog; | |
444 | } | |
445 | ||
446 | META_COLLECTOR(int_sk_prio) | |
447 | { | |
448 | SKIP_NONLOCAL(skb); | |
449 | dst->value = skb->sk->sk_priority; | |
450 | } | |
451 | ||
452 | META_COLLECTOR(int_sk_rcvlowat) | |
453 | { | |
454 | SKIP_NONLOCAL(skb); | |
455 | dst->value = skb->sk->sk_rcvlowat; | |
456 | } | |
457 | ||
458 | META_COLLECTOR(int_sk_rcvtimeo) | |
459 | { | |
460 | SKIP_NONLOCAL(skb); | |
461 | dst->value = skb->sk->sk_rcvtimeo / HZ; | |
462 | } | |
463 | ||
464 | META_COLLECTOR(int_sk_sndtimeo) | |
465 | { | |
466 | SKIP_NONLOCAL(skb); | |
467 | dst->value = skb->sk->sk_sndtimeo / HZ; | |
468 | } | |
469 | ||
470 | META_COLLECTOR(int_sk_sendmsg_off) | |
471 | { | |
472 | SKIP_NONLOCAL(skb); | |
473 | dst->value = skb->sk->sk_sndmsg_off; | |
474 | } | |
475 | ||
476 | META_COLLECTOR(int_sk_write_pend) | |
477 | { | |
478 | SKIP_NONLOCAL(skb); | |
479 | dst->value = skb->sk->sk_write_pending; | |
480 | } | |
481 | ||
1da177e4 LT |
482 | /************************************************************************** |
483 | * Meta value collectors assignment table | |
484 | **************************************************************************/ | |
485 | ||
486 | struct meta_ops | |
487 | { | |
488 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, | |
489 | struct meta_value *, struct meta_obj *, int *); | |
490 | }; | |
491 | ||
48900629 TG |
492 | #define META_ID(name) TCF_META_ID_##name |
493 | #define META_FUNC(name) { .get = meta_##name } | |
494 | ||
1da177e4 LT |
495 | /* Meta value operations table listing all meta value collectors and |
496 | * assigns them to a type and meta id. */ | |
497 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = { | |
498 | [TCF_META_TYPE_VAR] = { | |
48900629 | 499 | [META_ID(DEV)] = META_FUNC(var_dev), |
48900629 | 500 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
1da177e4 LT |
501 | }, |
502 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
503 | [META_ID(RANDOM)] = META_FUNC(int_random), |
504 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
505 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
506 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
507 | [META_ID(DEV)] = META_FUNC(int_dev), | |
48900629 TG |
508 | [META_ID(PRIORITY)] = META_FUNC(int_priority), |
509 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
48900629 TG |
510 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), |
511 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
512 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
513 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
82e91ffe | 514 | [META_ID(NFMARK)] = META_FUNC(int_mark), |
48900629 | 515 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
48900629 | 516 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
48900629 TG |
517 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
518 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
519 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
520 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
521 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
522 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
523 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
524 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
525 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
526 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
527 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
528 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
529 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
530 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
531 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
532 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
533 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
534 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
535 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
536 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
537 | [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps), | |
81c3d547 | 538 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
48900629 TG |
539 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), |
540 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
541 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
542 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
543 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
544 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
545 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
546 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
547 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
3113e88c | 548 | [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag), |
c2e3143e | 549 | [META_ID(RXHASH)] = META_FUNC(int_rxhash), |
1da177e4 LT |
550 | } |
551 | }; | |
552 | ||
553 | static inline struct meta_ops * meta_ops(struct meta_value *val) | |
554 | { | |
555 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
556 | } | |
557 | ||
558 | /************************************************************************** | |
559 | * Type specific operations for TCF_META_TYPE_VAR | |
560 | **************************************************************************/ | |
561 | ||
562 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
563 | { | |
564 | int r = a->len - b->len; | |
565 | ||
566 | if (r == 0) | |
567 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
568 | ||
569 | return r; | |
570 | } | |
571 | ||
add93b61 | 572 | static int meta_var_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 573 | { |
add93b61 | 574 | int len = nla_len(nla); |
1da177e4 | 575 | |
add93b61 | 576 | dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); |
1da177e4 LT |
577 | if (dst->val == 0UL) |
578 | return -ENOMEM; | |
1da177e4 LT |
579 | dst->len = len; |
580 | return 0; | |
581 | } | |
582 | ||
583 | static void meta_var_destroy(struct meta_value *v) | |
584 | { | |
a51482bd | 585 | kfree((void *) v->val); |
1da177e4 LT |
586 | } |
587 | ||
588 | static void meta_var_apply_extras(struct meta_value *v, | |
589 | struct meta_obj *dst) | |
590 | { | |
591 | int shift = v->hdr.shift; | |
592 | ||
593 | if (shift && shift < dst->len) | |
594 | dst->len -= shift; | |
595 | } | |
596 | ||
597 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
598 | { | |
599 | if (v->val && v->len) | |
add93b61 | 600 | NLA_PUT(skb, tlv, v->len, (void *) v->val); |
1da177e4 LT |
601 | return 0; |
602 | ||
add93b61 | 603 | nla_put_failure: |
1da177e4 LT |
604 | return -1; |
605 | } | |
606 | ||
607 | /************************************************************************** | |
608 | * Type specific operations for TCF_META_TYPE_INT | |
609 | **************************************************************************/ | |
610 | ||
611 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
612 | { | |
613 | /* Let gcc optimize it, the unlikely is not really based on | |
614 | * some numbers but jump free code for mismatches seems | |
615 | * more logical. */ | |
98e56405 | 616 | if (unlikely(a->value == b->value)) |
1da177e4 | 617 | return 0; |
98e56405 | 618 | else if (a->value < b->value) |
1da177e4 LT |
619 | return -1; |
620 | else | |
621 | return 1; | |
622 | } | |
623 | ||
add93b61 | 624 | static int meta_int_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 625 | { |
add93b61 PM |
626 | if (nla_len(nla) >= sizeof(unsigned long)) { |
627 | dst->val = *(unsigned long *) nla_data(nla); | |
1da177e4 | 628 | dst->len = sizeof(unsigned long); |
add93b61 | 629 | } else if (nla_len(nla) == sizeof(u32)) { |
1587bac4 | 630 | dst->val = nla_get_u32(nla); |
1da177e4 LT |
631 | dst->len = sizeof(u32); |
632 | } else | |
633 | return -EINVAL; | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | static void meta_int_apply_extras(struct meta_value *v, | |
639 | struct meta_obj *dst) | |
640 | { | |
641 | if (v->hdr.shift) | |
642 | dst->value >>= v->hdr.shift; | |
643 | ||
644 | if (v->val) | |
645 | dst->value &= v->val; | |
646 | } | |
647 | ||
648 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
649 | { | |
650 | if (v->len == sizeof(unsigned long)) | |
add93b61 | 651 | NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val); |
1da177e4 | 652 | else if (v->len == sizeof(u32)) { |
24beeab5 | 653 | NLA_PUT_U32(skb, tlv, v->val); |
1da177e4 LT |
654 | } |
655 | ||
656 | return 0; | |
657 | ||
add93b61 | 658 | nla_put_failure: |
1da177e4 LT |
659 | return -1; |
660 | } | |
661 | ||
662 | /************************************************************************** | |
663 | * Type specific operations table | |
664 | **************************************************************************/ | |
665 | ||
666 | struct meta_type_ops | |
667 | { | |
668 | void (*destroy)(struct meta_value *); | |
669 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
add93b61 | 670 | int (*change)(struct meta_value *, struct nlattr *); |
1da177e4 LT |
671 | void (*apply_extras)(struct meta_value *, struct meta_obj *); |
672 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
673 | }; | |
674 | ||
675 | static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = { | |
676 | [TCF_META_TYPE_VAR] = { | |
677 | .destroy = meta_var_destroy, | |
678 | .compare = meta_var_compare, | |
679 | .change = meta_var_change, | |
680 | .apply_extras = meta_var_apply_extras, | |
681 | .dump = meta_var_dump | |
682 | }, | |
683 | [TCF_META_TYPE_INT] = { | |
684 | .compare = meta_int_compare, | |
685 | .change = meta_int_change, | |
686 | .apply_extras = meta_int_apply_extras, | |
687 | .dump = meta_int_dump | |
688 | } | |
689 | }; | |
690 | ||
691 | static inline struct meta_type_ops * meta_type_ops(struct meta_value *v) | |
692 | { | |
693 | return &__meta_type_ops[meta_type(v)]; | |
694 | } | |
695 | ||
696 | /************************************************************************** | |
697 | * Core | |
698 | **************************************************************************/ | |
699 | ||
ed7af3b3 SH |
700 | static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, |
701 | struct meta_value *v, struct meta_obj *dst) | |
1da177e4 LT |
702 | { |
703 | int err = 0; | |
704 | ||
705 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
706 | dst->value = v->val; | |
707 | dst->len = v->len; | |
708 | return 0; | |
709 | } | |
710 | ||
711 | meta_ops(v)->get(skb, info, v, dst, &err); | |
712 | if (err < 0) | |
713 | return err; | |
714 | ||
715 | if (meta_type_ops(v)->apply_extras) | |
716 | meta_type_ops(v)->apply_extras(v, dst); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
722 | struct tcf_pkt_info *info) | |
723 | { | |
724 | int r; | |
725 | struct meta_match *meta = (struct meta_match *) m->data; | |
726 | struct meta_obj l_value, r_value; | |
727 | ||
728 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
729 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
730 | return 0; | |
731 | ||
732 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
733 | ||
734 | switch (meta->lvalue.hdr.op) { | |
735 | case TCF_EM_OPND_EQ: | |
736 | return !r; | |
737 | case TCF_EM_OPND_LT: | |
738 | return r < 0; | |
739 | case TCF_EM_OPND_GT: | |
740 | return r > 0; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
ed7af3b3 | 746 | static void meta_delete(struct meta_match *meta) |
1da177e4 | 747 | { |
04f217ac SH |
748 | if (meta) { |
749 | struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
1da177e4 | 750 | |
04f217ac SH |
751 | if (ops && ops->destroy) { |
752 | ops->destroy(&meta->lvalue); | |
753 | ops->destroy(&meta->rvalue); | |
754 | } | |
1da177e4 LT |
755 | } |
756 | ||
757 | kfree(meta); | |
758 | } | |
759 | ||
add93b61 | 760 | static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 761 | { |
add93b61 PM |
762 | if (nla) { |
763 | if (nla_len(nla) == 0) | |
1da177e4 LT |
764 | return -EINVAL; |
765 | ||
add93b61 | 766 | return meta_type_ops(dst)->change(dst, nla); |
1da177e4 LT |
767 | } |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | static inline int meta_is_supported(struct meta_value *val) | |
773 | { | |
774 | return (!meta_id(val) || meta_ops(val)->get); | |
775 | } | |
776 | ||
7a9c1bd4 PM |
777 | static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = { |
778 | [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) }, | |
779 | }; | |
780 | ||
1da177e4 LT |
781 | static int em_meta_change(struct tcf_proto *tp, void *data, int len, |
782 | struct tcf_ematch *m) | |
783 | { | |
cee63723 | 784 | int err; |
add93b61 | 785 | struct nlattr *tb[TCA_EM_META_MAX + 1]; |
1da177e4 LT |
786 | struct tcf_meta_hdr *hdr; |
787 | struct meta_match *meta = NULL; | |
10297b99 | 788 | |
7a9c1bd4 | 789 | err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy); |
cee63723 | 790 | if (err < 0) |
1da177e4 LT |
791 | goto errout; |
792 | ||
cee63723 | 793 | err = -EINVAL; |
7a9c1bd4 | 794 | if (tb[TCA_EM_META_HDR] == NULL) |
1da177e4 | 795 | goto errout; |
add93b61 | 796 | hdr = nla_data(tb[TCA_EM_META_HDR]); |
1da177e4 LT |
797 | |
798 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
799 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
800 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
801 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
802 | goto errout; | |
803 | ||
0da974f4 | 804 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
1da177e4 LT |
805 | if (meta == NULL) |
806 | goto errout; | |
1da177e4 LT |
807 | |
808 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
809 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
810 | ||
811 | if (!meta_is_supported(&meta->lvalue) || | |
812 | !meta_is_supported(&meta->rvalue)) { | |
813 | err = -EOPNOTSUPP; | |
814 | goto errout; | |
815 | } | |
816 | ||
add93b61 PM |
817 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 || |
818 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0) | |
1da177e4 LT |
819 | goto errout; |
820 | ||
821 | m->datalen = sizeof(*meta); | |
822 | m->data = (unsigned long) meta; | |
823 | ||
824 | err = 0; | |
825 | errout: | |
826 | if (err && meta) | |
827 | meta_delete(meta); | |
828 | return err; | |
829 | } | |
830 | ||
831 | static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m) | |
832 | { | |
833 | if (m) | |
834 | meta_delete((struct meta_match *) m->data); | |
835 | } | |
836 | ||
837 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
838 | { | |
839 | struct meta_match *meta = (struct meta_match *) em->data; | |
840 | struct tcf_meta_hdr hdr; | |
841 | struct meta_type_ops *ops; | |
842 | ||
843 | memset(&hdr, 0, sizeof(hdr)); | |
844 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
845 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
846 | ||
add93b61 | 847 | NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr); |
1da177e4 LT |
848 | |
849 | ops = meta_type_ops(&meta->lvalue); | |
850 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
851 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
add93b61 | 852 | goto nla_put_failure; |
1da177e4 LT |
853 | |
854 | return 0; | |
855 | ||
add93b61 | 856 | nla_put_failure: |
1da177e4 | 857 | return -1; |
10297b99 | 858 | } |
1da177e4 LT |
859 | |
860 | static struct tcf_ematch_ops em_meta_ops = { | |
861 | .kind = TCF_EM_META, | |
862 | .change = em_meta_change, | |
863 | .match = em_meta_match, | |
864 | .destroy = em_meta_destroy, | |
865 | .dump = em_meta_dump, | |
866 | .owner = THIS_MODULE, | |
867 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
868 | }; | |
869 | ||
870 | static int __init init_em_meta(void) | |
871 | { | |
872 | return tcf_em_register(&em_meta_ops); | |
873 | } | |
874 | ||
10297b99 | 875 | static void __exit exit_em_meta(void) |
1da177e4 LT |
876 | { |
877 | tcf_em_unregister(&em_meta_ops); | |
878 | } | |
879 | ||
880 | MODULE_LICENSE("GPL"); | |
881 | ||
882 | module_init(init_em_meta); | |
883 | module_exit(exit_em_meta); | |
db3d99c0 PM |
884 | |
885 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |