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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 | ||
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> | |
3113e88c | 68 | #include <linux/if_vlan.h> |
1da177e4 LT |
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 | ||
3113e88c SH |
173 | /************************************************************************** |
174 | * vlan tag | |
175 | **************************************************************************/ | |
176 | ||
177 | META_COLLECTOR(int_vlan_tag) | |
178 | { | |
1a31f204 SH |
179 | unsigned short tag; |
180 | ||
181 | tag = vlan_tx_tag_get(skb); | |
182 | if (!tag && __vlan_get_tag(skb, &tag)) | |
3113e88c SH |
183 | *err = -1; |
184 | else | |
185 | dst->value = tag; | |
186 | } | |
187 | ||
188 | ||
189 | ||
1da177e4 LT |
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 = skb->protocol; | |
203 | } | |
204 | ||
1da177e4 LT |
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 | /************************************************************************** | |
226 | * Netfilter | |
227 | **************************************************************************/ | |
228 | ||
82e91ffe | 229 | META_COLLECTOR(int_mark) |
1da177e4 | 230 | { |
82e91ffe | 231 | dst->value = skb->mark; |
7686ee1a | 232 | } |
1da177e4 LT |
233 | |
234 | /************************************************************************** | |
235 | * Traffic Control | |
236 | **************************************************************************/ | |
237 | ||
238 | META_COLLECTOR(int_tcindex) | |
239 | { | |
240 | dst->value = skb->tc_index; | |
241 | } | |
242 | ||
1da177e4 LT |
243 | /************************************************************************** |
244 | * Routing | |
245 | **************************************************************************/ | |
246 | ||
1da177e4 LT |
247 | META_COLLECTOR(int_rtclassid) |
248 | { | |
adf30907 | 249 | if (unlikely(skb_dst(skb) == NULL)) |
1da177e4 LT |
250 | *err = -1; |
251 | else | |
7686ee1a | 252 | #ifdef CONFIG_NET_CLS_ROUTE |
adf30907 | 253 | dst->value = skb_dst(skb)->tclassid; |
7686ee1a PM |
254 | #else |
255 | dst->value = 0; | |
1da177e4 | 256 | #endif |
7686ee1a | 257 | } |
1da177e4 LT |
258 | |
259 | META_COLLECTOR(int_rtiif) | |
260 | { | |
511c3f92 | 261 | if (unlikely(skb_rtable(skb) == NULL)) |
1da177e4 LT |
262 | *err = -1; |
263 | else | |
511c3f92 | 264 | dst->value = skb_rtable(skb)->fl.iif; |
1da177e4 LT |
265 | } |
266 | ||
48900629 TG |
267 | /************************************************************************** |
268 | * Socket Attributes | |
269 | **************************************************************************/ | |
270 | ||
271 | #define SKIP_NONLOCAL(skb) \ | |
272 | if (unlikely(skb->sk == NULL)) { \ | |
273 | *err = -1; \ | |
274 | return; \ | |
275 | } | |
276 | ||
277 | META_COLLECTOR(int_sk_family) | |
278 | { | |
279 | SKIP_NONLOCAL(skb); | |
280 | dst->value = skb->sk->sk_family; | |
281 | } | |
282 | ||
283 | META_COLLECTOR(int_sk_state) | |
284 | { | |
285 | SKIP_NONLOCAL(skb); | |
286 | dst->value = skb->sk->sk_state; | |
287 | } | |
288 | ||
289 | META_COLLECTOR(int_sk_reuse) | |
290 | { | |
291 | SKIP_NONLOCAL(skb); | |
292 | dst->value = skb->sk->sk_reuse; | |
293 | } | |
294 | ||
295 | META_COLLECTOR(int_sk_bound_if) | |
296 | { | |
297 | SKIP_NONLOCAL(skb); | |
298 | /* No error if bound_dev_if is 0, legal userspace check */ | |
299 | dst->value = skb->sk->sk_bound_dev_if; | |
300 | } | |
301 | ||
302 | META_COLLECTOR(var_sk_bound_if) | |
303 | { | |
304 | SKIP_NONLOCAL(skb); | |
305 | ||
d0075634 | 306 | if (skb->sk->sk_bound_dev_if == 0) { |
48900629 TG |
307 | dst->value = (unsigned long) "any"; |
308 | dst->len = 3; | |
d0075634 | 309 | } else { |
48900629 | 310 | struct net_device *dev; |
10297b99 | 311 | |
d0075634 | 312 | rcu_read_lock(); |
2939e275 ED |
313 | dev = dev_get_by_index_rcu(sock_net(skb->sk), |
314 | skb->sk->sk_bound_dev_if); | |
48900629 | 315 | *err = var_dev(dev, dst); |
d0075634 ED |
316 | rcu_read_unlock(); |
317 | } | |
48900629 TG |
318 | } |
319 | ||
320 | META_COLLECTOR(int_sk_refcnt) | |
321 | { | |
322 | SKIP_NONLOCAL(skb); | |
323 | dst->value = atomic_read(&skb->sk->sk_refcnt); | |
324 | } | |
325 | ||
326 | META_COLLECTOR(int_sk_rcvbuf) | |
327 | { | |
328 | SKIP_NONLOCAL(skb); | |
329 | dst->value = skb->sk->sk_rcvbuf; | |
330 | } | |
331 | ||
332 | META_COLLECTOR(int_sk_shutdown) | |
333 | { | |
334 | SKIP_NONLOCAL(skb); | |
335 | dst->value = skb->sk->sk_shutdown; | |
336 | } | |
337 | ||
338 | META_COLLECTOR(int_sk_proto) | |
339 | { | |
340 | SKIP_NONLOCAL(skb); | |
341 | dst->value = skb->sk->sk_protocol; | |
342 | } | |
343 | ||
344 | META_COLLECTOR(int_sk_type) | |
345 | { | |
346 | SKIP_NONLOCAL(skb); | |
347 | dst->value = skb->sk->sk_type; | |
348 | } | |
349 | ||
350 | META_COLLECTOR(int_sk_rmem_alloc) | |
351 | { | |
352 | SKIP_NONLOCAL(skb); | |
31e6d363 | 353 | dst->value = sk_rmem_alloc_get(skb->sk); |
48900629 TG |
354 | } |
355 | ||
356 | META_COLLECTOR(int_sk_wmem_alloc) | |
357 | { | |
358 | SKIP_NONLOCAL(skb); | |
31e6d363 | 359 | dst->value = sk_wmem_alloc_get(skb->sk); |
48900629 TG |
360 | } |
361 | ||
362 | META_COLLECTOR(int_sk_omem_alloc) | |
363 | { | |
364 | SKIP_NONLOCAL(skb); | |
365 | dst->value = atomic_read(&skb->sk->sk_omem_alloc); | |
366 | } | |
367 | ||
368 | META_COLLECTOR(int_sk_rcv_qlen) | |
369 | { | |
370 | SKIP_NONLOCAL(skb); | |
371 | dst->value = skb->sk->sk_receive_queue.qlen; | |
372 | } | |
373 | ||
374 | META_COLLECTOR(int_sk_snd_qlen) | |
375 | { | |
376 | SKIP_NONLOCAL(skb); | |
377 | dst->value = skb->sk->sk_write_queue.qlen; | |
378 | } | |
379 | ||
380 | META_COLLECTOR(int_sk_wmem_queued) | |
381 | { | |
382 | SKIP_NONLOCAL(skb); | |
383 | dst->value = skb->sk->sk_wmem_queued; | |
384 | } | |
385 | ||
386 | META_COLLECTOR(int_sk_fwd_alloc) | |
387 | { | |
388 | SKIP_NONLOCAL(skb); | |
389 | dst->value = skb->sk->sk_forward_alloc; | |
390 | } | |
391 | ||
392 | META_COLLECTOR(int_sk_sndbuf) | |
393 | { | |
394 | SKIP_NONLOCAL(skb); | |
395 | dst->value = skb->sk->sk_sndbuf; | |
396 | } | |
397 | ||
398 | META_COLLECTOR(int_sk_alloc) | |
399 | { | |
400 | SKIP_NONLOCAL(skb); | |
401 | dst->value = skb->sk->sk_allocation; | |
402 | } | |
403 | ||
404 | META_COLLECTOR(int_sk_route_caps) | |
405 | { | |
406 | SKIP_NONLOCAL(skb); | |
407 | dst->value = skb->sk->sk_route_caps; | |
408 | } | |
409 | ||
81c3d547 | 410 | META_COLLECTOR(int_sk_hash) |
48900629 TG |
411 | { |
412 | SKIP_NONLOCAL(skb); | |
81c3d547 | 413 | dst->value = skb->sk->sk_hash; |
48900629 TG |
414 | } |
415 | ||
416 | META_COLLECTOR(int_sk_lingertime) | |
417 | { | |
418 | SKIP_NONLOCAL(skb); | |
419 | dst->value = skb->sk->sk_lingertime / HZ; | |
420 | } | |
421 | ||
422 | META_COLLECTOR(int_sk_err_qlen) | |
423 | { | |
424 | SKIP_NONLOCAL(skb); | |
425 | dst->value = skb->sk->sk_error_queue.qlen; | |
426 | } | |
427 | ||
428 | META_COLLECTOR(int_sk_ack_bl) | |
429 | { | |
430 | SKIP_NONLOCAL(skb); | |
431 | dst->value = skb->sk->sk_ack_backlog; | |
432 | } | |
433 | ||
434 | META_COLLECTOR(int_sk_max_ack_bl) | |
435 | { | |
436 | SKIP_NONLOCAL(skb); | |
437 | dst->value = skb->sk->sk_max_ack_backlog; | |
438 | } | |
439 | ||
440 | META_COLLECTOR(int_sk_prio) | |
441 | { | |
442 | SKIP_NONLOCAL(skb); | |
443 | dst->value = skb->sk->sk_priority; | |
444 | } | |
445 | ||
446 | META_COLLECTOR(int_sk_rcvlowat) | |
447 | { | |
448 | SKIP_NONLOCAL(skb); | |
449 | dst->value = skb->sk->sk_rcvlowat; | |
450 | } | |
451 | ||
452 | META_COLLECTOR(int_sk_rcvtimeo) | |
453 | { | |
454 | SKIP_NONLOCAL(skb); | |
455 | dst->value = skb->sk->sk_rcvtimeo / HZ; | |
456 | } | |
457 | ||
458 | META_COLLECTOR(int_sk_sndtimeo) | |
459 | { | |
460 | SKIP_NONLOCAL(skb); | |
461 | dst->value = skb->sk->sk_sndtimeo / HZ; | |
462 | } | |
463 | ||
464 | META_COLLECTOR(int_sk_sendmsg_off) | |
465 | { | |
466 | SKIP_NONLOCAL(skb); | |
467 | dst->value = skb->sk->sk_sndmsg_off; | |
468 | } | |
469 | ||
470 | META_COLLECTOR(int_sk_write_pend) | |
471 | { | |
472 | SKIP_NONLOCAL(skb); | |
473 | dst->value = skb->sk->sk_write_pending; | |
474 | } | |
475 | ||
1da177e4 LT |
476 | /************************************************************************** |
477 | * Meta value collectors assignment table | |
478 | **************************************************************************/ | |
479 | ||
480 | struct meta_ops | |
481 | { | |
482 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, | |
483 | struct meta_value *, struct meta_obj *, int *); | |
484 | }; | |
485 | ||
48900629 TG |
486 | #define META_ID(name) TCF_META_ID_##name |
487 | #define META_FUNC(name) { .get = meta_##name } | |
488 | ||
1da177e4 LT |
489 | /* Meta value operations table listing all meta value collectors and |
490 | * assigns them to a type and meta id. */ | |
491 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = { | |
492 | [TCF_META_TYPE_VAR] = { | |
48900629 | 493 | [META_ID(DEV)] = META_FUNC(var_dev), |
48900629 | 494 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
1da177e4 LT |
495 | }, |
496 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
497 | [META_ID(RANDOM)] = META_FUNC(int_random), |
498 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
499 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
500 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
501 | [META_ID(DEV)] = META_FUNC(int_dev), | |
48900629 TG |
502 | [META_ID(PRIORITY)] = META_FUNC(int_priority), |
503 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
48900629 TG |
504 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), |
505 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
506 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
507 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
82e91ffe | 508 | [META_ID(NFMARK)] = META_FUNC(int_mark), |
48900629 | 509 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
48900629 | 510 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
48900629 TG |
511 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
512 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
513 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
514 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
515 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
516 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
517 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
518 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
519 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
520 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
521 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
522 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
523 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
524 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
525 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
526 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
527 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
528 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
529 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
530 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
531 | [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps), | |
81c3d547 | 532 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
48900629 TG |
533 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), |
534 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
535 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
536 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
537 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
538 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
539 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
540 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
541 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
3113e88c | 542 | [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag), |
1da177e4 LT |
543 | } |
544 | }; | |
545 | ||
546 | static inline struct meta_ops * meta_ops(struct meta_value *val) | |
547 | { | |
548 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
549 | } | |
550 | ||
551 | /************************************************************************** | |
552 | * Type specific operations for TCF_META_TYPE_VAR | |
553 | **************************************************************************/ | |
554 | ||
555 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
556 | { | |
557 | int r = a->len - b->len; | |
558 | ||
559 | if (r == 0) | |
560 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
561 | ||
562 | return r; | |
563 | } | |
564 | ||
add93b61 | 565 | static int meta_var_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 566 | { |
add93b61 | 567 | int len = nla_len(nla); |
1da177e4 | 568 | |
add93b61 | 569 | dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); |
1da177e4 LT |
570 | if (dst->val == 0UL) |
571 | return -ENOMEM; | |
1da177e4 LT |
572 | dst->len = len; |
573 | return 0; | |
574 | } | |
575 | ||
576 | static void meta_var_destroy(struct meta_value *v) | |
577 | { | |
a51482bd | 578 | kfree((void *) v->val); |
1da177e4 LT |
579 | } |
580 | ||
581 | static void meta_var_apply_extras(struct meta_value *v, | |
582 | struct meta_obj *dst) | |
583 | { | |
584 | int shift = v->hdr.shift; | |
585 | ||
586 | if (shift && shift < dst->len) | |
587 | dst->len -= shift; | |
588 | } | |
589 | ||
590 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
591 | { | |
592 | if (v->val && v->len) | |
add93b61 | 593 | NLA_PUT(skb, tlv, v->len, (void *) v->val); |
1da177e4 LT |
594 | return 0; |
595 | ||
add93b61 | 596 | nla_put_failure: |
1da177e4 LT |
597 | return -1; |
598 | } | |
599 | ||
600 | /************************************************************************** | |
601 | * Type specific operations for TCF_META_TYPE_INT | |
602 | **************************************************************************/ | |
603 | ||
604 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
605 | { | |
606 | /* Let gcc optimize it, the unlikely is not really based on | |
607 | * some numbers but jump free code for mismatches seems | |
608 | * more logical. */ | |
98e56405 | 609 | if (unlikely(a->value == b->value)) |
1da177e4 | 610 | return 0; |
98e56405 | 611 | else if (a->value < b->value) |
1da177e4 LT |
612 | return -1; |
613 | else | |
614 | return 1; | |
615 | } | |
616 | ||
add93b61 | 617 | static int meta_int_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 618 | { |
add93b61 PM |
619 | if (nla_len(nla) >= sizeof(unsigned long)) { |
620 | dst->val = *(unsigned long *) nla_data(nla); | |
1da177e4 | 621 | dst->len = sizeof(unsigned long); |
add93b61 | 622 | } else if (nla_len(nla) == sizeof(u32)) { |
1587bac4 | 623 | dst->val = nla_get_u32(nla); |
1da177e4 LT |
624 | dst->len = sizeof(u32); |
625 | } else | |
626 | return -EINVAL; | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | static void meta_int_apply_extras(struct meta_value *v, | |
632 | struct meta_obj *dst) | |
633 | { | |
634 | if (v->hdr.shift) | |
635 | dst->value >>= v->hdr.shift; | |
636 | ||
637 | if (v->val) | |
638 | dst->value &= v->val; | |
639 | } | |
640 | ||
641 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
642 | { | |
643 | if (v->len == sizeof(unsigned long)) | |
add93b61 | 644 | NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val); |
1da177e4 | 645 | else if (v->len == sizeof(u32)) { |
24beeab5 | 646 | NLA_PUT_U32(skb, tlv, v->val); |
1da177e4 LT |
647 | } |
648 | ||
649 | return 0; | |
650 | ||
add93b61 | 651 | nla_put_failure: |
1da177e4 LT |
652 | return -1; |
653 | } | |
654 | ||
655 | /************************************************************************** | |
656 | * Type specific operations table | |
657 | **************************************************************************/ | |
658 | ||
659 | struct meta_type_ops | |
660 | { | |
661 | void (*destroy)(struct meta_value *); | |
662 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
add93b61 | 663 | int (*change)(struct meta_value *, struct nlattr *); |
1da177e4 LT |
664 | void (*apply_extras)(struct meta_value *, struct meta_obj *); |
665 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
666 | }; | |
667 | ||
668 | static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = { | |
669 | [TCF_META_TYPE_VAR] = { | |
670 | .destroy = meta_var_destroy, | |
671 | .compare = meta_var_compare, | |
672 | .change = meta_var_change, | |
673 | .apply_extras = meta_var_apply_extras, | |
674 | .dump = meta_var_dump | |
675 | }, | |
676 | [TCF_META_TYPE_INT] = { | |
677 | .compare = meta_int_compare, | |
678 | .change = meta_int_change, | |
679 | .apply_extras = meta_int_apply_extras, | |
680 | .dump = meta_int_dump | |
681 | } | |
682 | }; | |
683 | ||
684 | static inline struct meta_type_ops * meta_type_ops(struct meta_value *v) | |
685 | { | |
686 | return &__meta_type_ops[meta_type(v)]; | |
687 | } | |
688 | ||
689 | /************************************************************************** | |
690 | * Core | |
691 | **************************************************************************/ | |
692 | ||
ed7af3b3 SH |
693 | static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, |
694 | struct meta_value *v, struct meta_obj *dst) | |
1da177e4 LT |
695 | { |
696 | int err = 0; | |
697 | ||
698 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
699 | dst->value = v->val; | |
700 | dst->len = v->len; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | meta_ops(v)->get(skb, info, v, dst, &err); | |
705 | if (err < 0) | |
706 | return err; | |
707 | ||
708 | if (meta_type_ops(v)->apply_extras) | |
709 | meta_type_ops(v)->apply_extras(v, dst); | |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
714 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
715 | struct tcf_pkt_info *info) | |
716 | { | |
717 | int r; | |
718 | struct meta_match *meta = (struct meta_match *) m->data; | |
719 | struct meta_obj l_value, r_value; | |
720 | ||
721 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
722 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
723 | return 0; | |
724 | ||
725 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
726 | ||
727 | switch (meta->lvalue.hdr.op) { | |
728 | case TCF_EM_OPND_EQ: | |
729 | return !r; | |
730 | case TCF_EM_OPND_LT: | |
731 | return r < 0; | |
732 | case TCF_EM_OPND_GT: | |
733 | return r > 0; | |
734 | } | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
ed7af3b3 | 739 | static void meta_delete(struct meta_match *meta) |
1da177e4 | 740 | { |
04f217ac SH |
741 | if (meta) { |
742 | struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); | |
1da177e4 | 743 | |
04f217ac SH |
744 | if (ops && ops->destroy) { |
745 | ops->destroy(&meta->lvalue); | |
746 | ops->destroy(&meta->rvalue); | |
747 | } | |
1da177e4 LT |
748 | } |
749 | ||
750 | kfree(meta); | |
751 | } | |
752 | ||
add93b61 | 753 | static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 754 | { |
add93b61 PM |
755 | if (nla) { |
756 | if (nla_len(nla) == 0) | |
1da177e4 LT |
757 | return -EINVAL; |
758 | ||
add93b61 | 759 | return meta_type_ops(dst)->change(dst, nla); |
1da177e4 LT |
760 | } |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | static inline int meta_is_supported(struct meta_value *val) | |
766 | { | |
767 | return (!meta_id(val) || meta_ops(val)->get); | |
768 | } | |
769 | ||
7a9c1bd4 PM |
770 | static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = { |
771 | [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) }, | |
772 | }; | |
773 | ||
1da177e4 LT |
774 | static int em_meta_change(struct tcf_proto *tp, void *data, int len, |
775 | struct tcf_ematch *m) | |
776 | { | |
cee63723 | 777 | int err; |
add93b61 | 778 | struct nlattr *tb[TCA_EM_META_MAX + 1]; |
1da177e4 LT |
779 | struct tcf_meta_hdr *hdr; |
780 | struct meta_match *meta = NULL; | |
10297b99 | 781 | |
7a9c1bd4 | 782 | err = nla_parse(tb, TCA_EM_META_MAX, data, len, meta_policy); |
cee63723 | 783 | if (err < 0) |
1da177e4 LT |
784 | goto errout; |
785 | ||
cee63723 | 786 | err = -EINVAL; |
7a9c1bd4 | 787 | if (tb[TCA_EM_META_HDR] == NULL) |
1da177e4 | 788 | goto errout; |
add93b61 | 789 | hdr = nla_data(tb[TCA_EM_META_HDR]); |
1da177e4 LT |
790 | |
791 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
792 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
793 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
794 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
795 | goto errout; | |
796 | ||
0da974f4 | 797 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
1da177e4 LT |
798 | if (meta == NULL) |
799 | goto errout; | |
1da177e4 LT |
800 | |
801 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
802 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
803 | ||
804 | if (!meta_is_supported(&meta->lvalue) || | |
805 | !meta_is_supported(&meta->rvalue)) { | |
806 | err = -EOPNOTSUPP; | |
807 | goto errout; | |
808 | } | |
809 | ||
add93b61 PM |
810 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 || |
811 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0) | |
1da177e4 LT |
812 | goto errout; |
813 | ||
814 | m->datalen = sizeof(*meta); | |
815 | m->data = (unsigned long) meta; | |
816 | ||
817 | err = 0; | |
818 | errout: | |
819 | if (err && meta) | |
820 | meta_delete(meta); | |
821 | return err; | |
822 | } | |
823 | ||
824 | static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m) | |
825 | { | |
826 | if (m) | |
827 | meta_delete((struct meta_match *) m->data); | |
828 | } | |
829 | ||
830 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
831 | { | |
832 | struct meta_match *meta = (struct meta_match *) em->data; | |
833 | struct tcf_meta_hdr hdr; | |
834 | struct meta_type_ops *ops; | |
835 | ||
836 | memset(&hdr, 0, sizeof(hdr)); | |
837 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
838 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
839 | ||
add93b61 | 840 | NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr); |
1da177e4 LT |
841 | |
842 | ops = meta_type_ops(&meta->lvalue); | |
843 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
844 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
add93b61 | 845 | goto nla_put_failure; |
1da177e4 LT |
846 | |
847 | return 0; | |
848 | ||
add93b61 | 849 | nla_put_failure: |
1da177e4 | 850 | return -1; |
10297b99 | 851 | } |
1da177e4 LT |
852 | |
853 | static struct tcf_ematch_ops em_meta_ops = { | |
854 | .kind = TCF_EM_META, | |
855 | .change = em_meta_change, | |
856 | .match = em_meta_match, | |
857 | .destroy = em_meta_destroy, | |
858 | .dump = em_meta_dump, | |
859 | .owner = THIS_MODULE, | |
860 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
861 | }; | |
862 | ||
863 | static int __init init_em_meta(void) | |
864 | { | |
865 | return tcf_em_register(&em_meta_ops); | |
866 | } | |
867 | ||
10297b99 | 868 | static void __exit exit_em_meta(void) |
1da177e4 LT |
869 | { |
870 | tcf_em_unregister(&em_meta_ops); | |
871 | } | |
872 | ||
873 | MODULE_LICENSE("GPL"); | |
874 | ||
875 | module_init(init_em_meta); | |
876 | module_exit(exit_em_meta); | |
db3d99c0 PM |
877 | |
878 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |