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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/em_meta.c Metadata ematch | |
4 | * | |
1da177e4 LT |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | * | |
7 | * ========================================================================== | |
10297b99 | 8 | * |
1da177e4 LT |
9 | * The metadata ematch compares two meta objects where each object |
10 | * represents either a meta value stored in the kernel or a static | |
11 | * value provided by userspace. The objects are not provided by | |
12 | * userspace itself but rather a definition providing the information | |
13 | * to build them. Every object is of a certain type which must be | |
14 | * equal to the object it is being compared to. | |
15 | * | |
16 | * The definition of a objects conists of the type (meta type), a | |
17 | * identifier (meta id) and additional type specific information. | |
18 | * The meta id is either TCF_META_TYPE_VALUE for values provided by | |
19 | * userspace or a index to the meta operations table consisting of | |
20 | * function pointers to type specific meta data collectors returning | |
21 | * the value of the requested meta value. | |
22 | * | |
23 | * lvalue rvalue | |
24 | * +-----------+ +-----------+ | |
25 | * | type: INT | | type: INT | | |
261688d0 | 26 | * def | id: DEV | | id: VALUE | |
1da177e4 LT |
27 | * | data: | | data: 3 | |
28 | * +-----------+ +-----------+ | |
29 | * | | | |
261688d0 | 30 | * ---> meta_ops[INT][DEV](...) | |
48900629 | 31 | * | | |
1da177e4 LT |
32 | * ----------- | |
33 | * V V | |
34 | * +-----------+ +-----------+ | |
35 | * | type: INT | | type: INT | | |
261688d0 | 36 | * obj | id: DEV | | id: VALUE | |
1da177e4 LT |
37 | * | data: 2 |<--data got filled out | data: 3 | |
38 | * +-----------+ +-----------+ | |
39 | * | | | |
40 | * --------------> 2 equals 3 <-------------- | |
41 | * | |
42 | * This is a simplified schema, the complexity varies depending | |
43 | * on the meta type. Obviously, the length of the data must also | |
44 | * be provided for non-numeric types. | |
45 | * | |
25985edc | 46 | * Additionally, type dependent modifiers such as shift operators |
1da177e4 LT |
47 | * or mask may be applied to extend the functionaliy. As of now, |
48 | * the variable length type supports shifting the byte string to | |
49 | * the right, eating up any number of octets and thus supporting | |
50 | * wildcard interface name comparisons such as "ppp%" matching | |
51 | * ppp0..9. | |
52 | * | |
53 | * NOTE: Certain meta values depend on other subsystems and are | |
3a4fa0a2 | 54 | * only available if that subsystem is enabled in the kernel. |
1da177e4 LT |
55 | */ |
56 | ||
5a0e3ad6 | 57 | #include <linux/slab.h> |
1da177e4 LT |
58 | #include <linux/module.h> |
59 | #include <linux/types.h> | |
60 | #include <linux/kernel.h> | |
61 | #include <linux/sched.h> | |
4f17722c | 62 | #include <linux/sched/loadavg.h> |
1da177e4 LT |
63 | #include <linux/string.h> |
64 | #include <linux/skbuff.h> | |
65 | #include <linux/random.h> | |
3113e88c | 66 | #include <linux/if_vlan.h> |
1da177e4 LT |
67 | #include <linux/tc_ematch/tc_em_meta.h> |
68 | #include <net/dst.h> | |
69 | #include <net/route.h> | |
70 | #include <net/pkt_cls.h> | |
48900629 | 71 | #include <net/sock.h> |
1da177e4 | 72 | |
cc7ec456 | 73 | struct meta_obj { |
1da177e4 LT |
74 | unsigned long value; |
75 | unsigned int len; | |
76 | }; | |
77 | ||
cc7ec456 | 78 | struct meta_value { |
1da177e4 LT |
79 | struct tcf_meta_val hdr; |
80 | unsigned long val; | |
81 | unsigned int len; | |
82 | }; | |
83 | ||
cc7ec456 | 84 | struct meta_match { |
1da177e4 LT |
85 | struct meta_value lvalue; |
86 | struct meta_value rvalue; | |
87 | }; | |
88 | ||
89 | static inline int meta_id(struct meta_value *v) | |
90 | { | |
91 | return TCF_META_ID(v->hdr.kind); | |
92 | } | |
93 | ||
94 | static inline int meta_type(struct meta_value *v) | |
95 | { | |
96 | return TCF_META_TYPE(v->hdr.kind); | |
97 | } | |
98 | ||
99 | #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \ | |
100 | struct tcf_pkt_info *info, struct meta_value *v, \ | |
101 | struct meta_obj *dst, int *err) | |
102 | ||
103 | /************************************************************************** | |
104 | * System status & misc | |
105 | **************************************************************************/ | |
106 | ||
107 | META_COLLECTOR(int_random) | |
108 | { | |
109 | get_random_bytes(&dst->value, sizeof(dst->value)); | |
110 | } | |
111 | ||
112 | static inline unsigned long fixed_loadavg(int load) | |
113 | { | |
114 | int rnd_load = load + (FIXED_1/200); | |
115 | int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT; | |
116 | ||
117 | return ((rnd_load >> FSHIFT) * 100) + rnd_frac; | |
118 | } | |
119 | ||
120 | META_COLLECTOR(int_loadavg_0) | |
121 | { | |
122 | dst->value = fixed_loadavg(avenrun[0]); | |
123 | } | |
124 | ||
125 | META_COLLECTOR(int_loadavg_1) | |
126 | { | |
127 | dst->value = fixed_loadavg(avenrun[1]); | |
128 | } | |
129 | ||
130 | META_COLLECTOR(int_loadavg_2) | |
131 | { | |
132 | dst->value = fixed_loadavg(avenrun[2]); | |
133 | } | |
134 | ||
135 | /************************************************************************** | |
136 | * Device names & indices | |
137 | **************************************************************************/ | |
138 | ||
139 | static inline int int_dev(struct net_device *dev, struct meta_obj *dst) | |
140 | { | |
141 | if (unlikely(dev == NULL)) | |
142 | return -1; | |
143 | ||
144 | dst->value = dev->ifindex; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static inline int var_dev(struct net_device *dev, struct meta_obj *dst) | |
149 | { | |
150 | if (unlikely(dev == NULL)) | |
151 | return -1; | |
152 | ||
153 | dst->value = (unsigned long) dev->name; | |
154 | dst->len = strlen(dev->name); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | META_COLLECTOR(int_dev) | |
159 | { | |
160 | *err = int_dev(skb->dev, dst); | |
161 | } | |
162 | ||
163 | META_COLLECTOR(var_dev) | |
164 | { | |
165 | *err = var_dev(skb->dev, dst); | |
166 | } | |
167 | ||
3113e88c SH |
168 | /************************************************************************** |
169 | * vlan tag | |
170 | **************************************************************************/ | |
171 | ||
172 | META_COLLECTOR(int_vlan_tag) | |
173 | { | |
1a31f204 SH |
174 | unsigned short tag; |
175 | ||
d65f2fa6 SL |
176 | if (skb_vlan_tag_present(skb)) |
177 | dst->value = skb_vlan_tag_get(skb); | |
178 | else if (!__vlan_get_tag(skb, &tag)) | |
3113e88c | 179 | dst->value = tag; |
d65f2fa6 SL |
180 | else |
181 | *err = -1; | |
3113e88c SH |
182 | } |
183 | ||
184 | ||
185 | ||
1da177e4 LT |
186 | /************************************************************************** |
187 | * skb attributes | |
188 | **************************************************************************/ | |
189 | ||
190 | META_COLLECTOR(int_priority) | |
191 | { | |
192 | dst->value = skb->priority; | |
193 | } | |
194 | ||
195 | META_COLLECTOR(int_protocol) | |
196 | { | |
197 | /* Let userspace take care of the byte ordering */ | |
3d51216e | 198 | dst->value = skb_protocol(skb, false); |
1da177e4 LT |
199 | } |
200 | ||
1da177e4 LT |
201 | META_COLLECTOR(int_pkttype) |
202 | { | |
203 | dst->value = skb->pkt_type; | |
204 | } | |
205 | ||
206 | META_COLLECTOR(int_pktlen) | |
207 | { | |
208 | dst->value = skb->len; | |
209 | } | |
210 | ||
211 | META_COLLECTOR(int_datalen) | |
212 | { | |
213 | dst->value = skb->data_len; | |
214 | } | |
215 | ||
216 | META_COLLECTOR(int_maclen) | |
217 | { | |
218 | dst->value = skb->mac_len; | |
219 | } | |
220 | ||
c2e3143e SH |
221 | META_COLLECTOR(int_rxhash) |
222 | { | |
3958afa1 | 223 | dst->value = skb_get_hash(skb); |
c2e3143e SH |
224 | } |
225 | ||
1da177e4 LT |
226 | /************************************************************************** |
227 | * Netfilter | |
228 | **************************************************************************/ | |
229 | ||
82e91ffe | 230 | META_COLLECTOR(int_mark) |
1da177e4 | 231 | { |
82e91ffe | 232 | dst->value = skb->mark; |
7686ee1a | 233 | } |
1da177e4 LT |
234 | |
235 | /************************************************************************** | |
236 | * Traffic Control | |
237 | **************************************************************************/ | |
238 | ||
239 | META_COLLECTOR(int_tcindex) | |
240 | { | |
241 | dst->value = skb->tc_index; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /************************************************************************** |
245 | * Routing | |
246 | **************************************************************************/ | |
247 | ||
1da177e4 LT |
248 | META_COLLECTOR(int_rtclassid) |
249 | { | |
adf30907 | 250 | if (unlikely(skb_dst(skb) == NULL)) |
1da177e4 LT |
251 | *err = -1; |
252 | else | |
c7066f70 | 253 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 | 254 | dst->value = skb_dst(skb)->tclassid; |
7686ee1a PM |
255 | #else |
256 | dst->value = 0; | |
1da177e4 | 257 | #endif |
7686ee1a | 258 | } |
1da177e4 LT |
259 | |
260 | META_COLLECTOR(int_rtiif) | |
261 | { | |
511c3f92 | 262 | if (unlikely(skb_rtable(skb) == NULL)) |
1da177e4 LT |
263 | *err = -1; |
264 | else | |
92101b3b | 265 | dst->value = inet_iif(skb); |
1da177e4 LT |
266 | } |
267 | ||
48900629 TG |
268 | /************************************************************************** |
269 | * Socket Attributes | |
270 | **************************************************************************/ | |
271 | ||
4f8f61eb YY |
272 | #define skip_nonlocal(skb) \ |
273 | (unlikely(skb->sk == NULL)) | |
48900629 TG |
274 | |
275 | META_COLLECTOR(int_sk_family) | |
276 | { | |
4f8f61eb YY |
277 | if (skip_nonlocal(skb)) { |
278 | *err = -1; | |
279 | return; | |
280 | } | |
48900629 TG |
281 | dst->value = skb->sk->sk_family; |
282 | } | |
283 | ||
284 | META_COLLECTOR(int_sk_state) | |
285 | { | |
4f8f61eb YY |
286 | if (skip_nonlocal(skb)) { |
287 | *err = -1; | |
288 | return; | |
289 | } | |
48900629 TG |
290 | dst->value = skb->sk->sk_state; |
291 | } | |
292 | ||
293 | META_COLLECTOR(int_sk_reuse) | |
294 | { | |
4f8f61eb YY |
295 | if (skip_nonlocal(skb)) { |
296 | *err = -1; | |
297 | return; | |
298 | } | |
48900629 TG |
299 | dst->value = skb->sk->sk_reuse; |
300 | } | |
301 | ||
302 | META_COLLECTOR(int_sk_bound_if) | |
303 | { | |
4f8f61eb YY |
304 | if (skip_nonlocal(skb)) { |
305 | *err = -1; | |
306 | return; | |
307 | } | |
48900629 TG |
308 | /* No error if bound_dev_if is 0, legal userspace check */ |
309 | dst->value = skb->sk->sk_bound_dev_if; | |
310 | } | |
311 | ||
312 | META_COLLECTOR(var_sk_bound_if) | |
313 | { | |
4f8f61eb YY |
314 | if (skip_nonlocal(skb)) { |
315 | *err = -1; | |
316 | return; | |
317 | } | |
48900629 | 318 | |
d0075634 | 319 | if (skb->sk->sk_bound_dev_if == 0) { |
48900629 TG |
320 | dst->value = (unsigned long) "any"; |
321 | dst->len = 3; | |
d0075634 | 322 | } else { |
48900629 | 323 | struct net_device *dev; |
10297b99 | 324 | |
d0075634 | 325 | rcu_read_lock(); |
2939e275 ED |
326 | dev = dev_get_by_index_rcu(sock_net(skb->sk), |
327 | skb->sk->sk_bound_dev_if); | |
48900629 | 328 | *err = var_dev(dev, dst); |
d0075634 ED |
329 | rcu_read_unlock(); |
330 | } | |
48900629 TG |
331 | } |
332 | ||
333 | META_COLLECTOR(int_sk_refcnt) | |
334 | { | |
4f8f61eb YY |
335 | if (skip_nonlocal(skb)) { |
336 | *err = -1; | |
337 | return; | |
338 | } | |
41c6d650 | 339 | dst->value = refcount_read(&skb->sk->sk_refcnt); |
48900629 TG |
340 | } |
341 | ||
342 | META_COLLECTOR(int_sk_rcvbuf) | |
343 | { | |
02a56c81 ED |
344 | const struct sock *sk = skb_to_full_sk(skb); |
345 | ||
346 | if (!sk) { | |
4f8f61eb YY |
347 | *err = -1; |
348 | return; | |
349 | } | |
02a56c81 | 350 | dst->value = sk->sk_rcvbuf; |
48900629 TG |
351 | } |
352 | ||
353 | META_COLLECTOR(int_sk_shutdown) | |
354 | { | |
02a56c81 ED |
355 | const struct sock *sk = skb_to_full_sk(skb); |
356 | ||
357 | if (!sk) { | |
4f8f61eb YY |
358 | *err = -1; |
359 | return; | |
360 | } | |
02a56c81 | 361 | dst->value = sk->sk_shutdown; |
48900629 TG |
362 | } |
363 | ||
364 | META_COLLECTOR(int_sk_proto) | |
365 | { | |
02a56c81 ED |
366 | const struct sock *sk = skb_to_full_sk(skb); |
367 | ||
368 | if (!sk) { | |
4f8f61eb YY |
369 | *err = -1; |
370 | return; | |
371 | } | |
02a56c81 | 372 | dst->value = sk->sk_protocol; |
48900629 TG |
373 | } |
374 | ||
375 | META_COLLECTOR(int_sk_type) | |
376 | { | |
02a56c81 ED |
377 | const struct sock *sk = skb_to_full_sk(skb); |
378 | ||
379 | if (!sk) { | |
4f8f61eb YY |
380 | *err = -1; |
381 | return; | |
382 | } | |
02a56c81 | 383 | dst->value = sk->sk_type; |
48900629 TG |
384 | } |
385 | ||
386 | META_COLLECTOR(int_sk_rmem_alloc) | |
387 | { | |
02a56c81 ED |
388 | const struct sock *sk = skb_to_full_sk(skb); |
389 | ||
390 | if (!sk) { | |
4f8f61eb YY |
391 | *err = -1; |
392 | return; | |
393 | } | |
02a56c81 | 394 | dst->value = sk_rmem_alloc_get(sk); |
48900629 TG |
395 | } |
396 | ||
397 | META_COLLECTOR(int_sk_wmem_alloc) | |
398 | { | |
02a56c81 ED |
399 | const struct sock *sk = skb_to_full_sk(skb); |
400 | ||
401 | if (!sk) { | |
4f8f61eb YY |
402 | *err = -1; |
403 | return; | |
404 | } | |
02a56c81 | 405 | dst->value = sk_wmem_alloc_get(sk); |
48900629 TG |
406 | } |
407 | ||
408 | META_COLLECTOR(int_sk_omem_alloc) | |
409 | { | |
02a56c81 ED |
410 | const struct sock *sk = skb_to_full_sk(skb); |
411 | ||
412 | if (!sk) { | |
4f8f61eb YY |
413 | *err = -1; |
414 | return; | |
415 | } | |
02a56c81 | 416 | dst->value = atomic_read(&sk->sk_omem_alloc); |
48900629 TG |
417 | } |
418 | ||
419 | META_COLLECTOR(int_sk_rcv_qlen) | |
420 | { | |
02a56c81 ED |
421 | const struct sock *sk = skb_to_full_sk(skb); |
422 | ||
423 | if (!sk) { | |
4f8f61eb YY |
424 | *err = -1; |
425 | return; | |
426 | } | |
02a56c81 | 427 | dst->value = sk->sk_receive_queue.qlen; |
48900629 TG |
428 | } |
429 | ||
430 | META_COLLECTOR(int_sk_snd_qlen) | |
431 | { | |
02a56c81 ED |
432 | const struct sock *sk = skb_to_full_sk(skb); |
433 | ||
434 | if (!sk) { | |
4f8f61eb YY |
435 | *err = -1; |
436 | return; | |
437 | } | |
02a56c81 | 438 | dst->value = sk->sk_write_queue.qlen; |
48900629 TG |
439 | } |
440 | ||
441 | META_COLLECTOR(int_sk_wmem_queued) | |
442 | { | |
02a56c81 ED |
443 | const struct sock *sk = skb_to_full_sk(skb); |
444 | ||
445 | if (!sk) { | |
4f8f61eb YY |
446 | *err = -1; |
447 | return; | |
448 | } | |
ab4e846a | 449 | dst->value = READ_ONCE(sk->sk_wmem_queued); |
48900629 TG |
450 | } |
451 | ||
452 | META_COLLECTOR(int_sk_fwd_alloc) | |
453 | { | |
02a56c81 ED |
454 | const struct sock *sk = skb_to_full_sk(skb); |
455 | ||
456 | if (!sk) { | |
4f8f61eb YY |
457 | *err = -1; |
458 | return; | |
459 | } | |
02a56c81 | 460 | dst->value = sk->sk_forward_alloc; |
48900629 TG |
461 | } |
462 | ||
463 | META_COLLECTOR(int_sk_sndbuf) | |
464 | { | |
02a56c81 ED |
465 | const struct sock *sk = skb_to_full_sk(skb); |
466 | ||
467 | if (!sk) { | |
4f8f61eb YY |
468 | *err = -1; |
469 | return; | |
470 | } | |
02a56c81 | 471 | dst->value = sk->sk_sndbuf; |
48900629 TG |
472 | } |
473 | ||
474 | META_COLLECTOR(int_sk_alloc) | |
475 | { | |
02a56c81 ED |
476 | const struct sock *sk = skb_to_full_sk(skb); |
477 | ||
478 | if (!sk) { | |
4f8f61eb YY |
479 | *err = -1; |
480 | return; | |
481 | } | |
02a56c81 | 482 | dst->value = (__force int) sk->sk_allocation; |
48900629 TG |
483 | } |
484 | ||
81c3d547 | 485 | META_COLLECTOR(int_sk_hash) |
48900629 | 486 | { |
4f8f61eb YY |
487 | if (skip_nonlocal(skb)) { |
488 | *err = -1; | |
489 | return; | |
490 | } | |
81c3d547 | 491 | dst->value = skb->sk->sk_hash; |
48900629 TG |
492 | } |
493 | ||
494 | META_COLLECTOR(int_sk_lingertime) | |
495 | { | |
02a56c81 ED |
496 | const struct sock *sk = skb_to_full_sk(skb); |
497 | ||
498 | if (!sk) { | |
4f8f61eb YY |
499 | *err = -1; |
500 | return; | |
501 | } | |
02a56c81 | 502 | dst->value = sk->sk_lingertime / HZ; |
48900629 TG |
503 | } |
504 | ||
505 | META_COLLECTOR(int_sk_err_qlen) | |
506 | { | |
02a56c81 ED |
507 | const struct sock *sk = skb_to_full_sk(skb); |
508 | ||
509 | if (!sk) { | |
4f8f61eb YY |
510 | *err = -1; |
511 | return; | |
512 | } | |
02a56c81 | 513 | dst->value = sk->sk_error_queue.qlen; |
48900629 TG |
514 | } |
515 | ||
516 | META_COLLECTOR(int_sk_ack_bl) | |
517 | { | |
02a56c81 ED |
518 | const struct sock *sk = skb_to_full_sk(skb); |
519 | ||
520 | if (!sk) { | |
4f8f61eb YY |
521 | *err = -1; |
522 | return; | |
523 | } | |
02a56c81 | 524 | dst->value = sk->sk_ack_backlog; |
48900629 TG |
525 | } |
526 | ||
527 | META_COLLECTOR(int_sk_max_ack_bl) | |
528 | { | |
02a56c81 ED |
529 | const struct sock *sk = skb_to_full_sk(skb); |
530 | ||
531 | if (!sk) { | |
4f8f61eb YY |
532 | *err = -1; |
533 | return; | |
534 | } | |
02a56c81 | 535 | dst->value = sk->sk_max_ack_backlog; |
48900629 TG |
536 | } |
537 | ||
538 | META_COLLECTOR(int_sk_prio) | |
539 | { | |
02a56c81 ED |
540 | const struct sock *sk = skb_to_full_sk(skb); |
541 | ||
542 | if (!sk) { | |
4f8f61eb YY |
543 | *err = -1; |
544 | return; | |
545 | } | |
02a56c81 | 546 | dst->value = sk->sk_priority; |
48900629 TG |
547 | } |
548 | ||
549 | META_COLLECTOR(int_sk_rcvlowat) | |
550 | { | |
02a56c81 ED |
551 | const struct sock *sk = skb_to_full_sk(skb); |
552 | ||
553 | if (!sk) { | |
4f8f61eb YY |
554 | *err = -1; |
555 | return; | |
556 | } | |
eac66402 | 557 | dst->value = READ_ONCE(sk->sk_rcvlowat); |
48900629 TG |
558 | } |
559 | ||
560 | META_COLLECTOR(int_sk_rcvtimeo) | |
561 | { | |
02a56c81 ED |
562 | const struct sock *sk = skb_to_full_sk(skb); |
563 | ||
564 | if (!sk) { | |
4f8f61eb YY |
565 | *err = -1; |
566 | return; | |
567 | } | |
02a56c81 | 568 | dst->value = sk->sk_rcvtimeo / HZ; |
48900629 TG |
569 | } |
570 | ||
571 | META_COLLECTOR(int_sk_sndtimeo) | |
572 | { | |
02a56c81 ED |
573 | const struct sock *sk = skb_to_full_sk(skb); |
574 | ||
575 | if (!sk) { | |
4f8f61eb YY |
576 | *err = -1; |
577 | return; | |
578 | } | |
02a56c81 | 579 | dst->value = sk->sk_sndtimeo / HZ; |
48900629 TG |
580 | } |
581 | ||
582 | META_COLLECTOR(int_sk_sendmsg_off) | |
583 | { | |
02a56c81 ED |
584 | const struct sock *sk = skb_to_full_sk(skb); |
585 | ||
586 | if (!sk) { | |
4f8f61eb YY |
587 | *err = -1; |
588 | return; | |
589 | } | |
02a56c81 | 590 | dst->value = sk->sk_frag.offset; |
48900629 TG |
591 | } |
592 | ||
593 | META_COLLECTOR(int_sk_write_pend) | |
594 | { | |
02a56c81 ED |
595 | const struct sock *sk = skb_to_full_sk(skb); |
596 | ||
597 | if (!sk) { | |
4f8f61eb YY |
598 | *err = -1; |
599 | return; | |
600 | } | |
02a56c81 | 601 | dst->value = sk->sk_write_pending; |
48900629 TG |
602 | } |
603 | ||
1da177e4 LT |
604 | /************************************************************************** |
605 | * Meta value collectors assignment table | |
606 | **************************************************************************/ | |
607 | ||
cc7ec456 | 608 | struct meta_ops { |
1da177e4 LT |
609 | void (*get)(struct sk_buff *, struct tcf_pkt_info *, |
610 | struct meta_value *, struct meta_obj *, int *); | |
611 | }; | |
612 | ||
48900629 TG |
613 | #define META_ID(name) TCF_META_ID_##name |
614 | #define META_FUNC(name) { .get = meta_##name } | |
615 | ||
1da177e4 LT |
616 | /* Meta value operations table listing all meta value collectors and |
617 | * assigns them to a type and meta id. */ | |
cc7ec456 | 618 | static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = { |
1da177e4 | 619 | [TCF_META_TYPE_VAR] = { |
48900629 | 620 | [META_ID(DEV)] = META_FUNC(var_dev), |
48900629 | 621 | [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
1da177e4 LT |
622 | }, |
623 | [TCF_META_TYPE_INT] = { | |
48900629 TG |
624 | [META_ID(RANDOM)] = META_FUNC(int_random), |
625 | [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), | |
626 | [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), | |
627 | [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), | |
628 | [META_ID(DEV)] = META_FUNC(int_dev), | |
48900629 TG |
629 | [META_ID(PRIORITY)] = META_FUNC(int_priority), |
630 | [META_ID(PROTOCOL)] = META_FUNC(int_protocol), | |
48900629 TG |
631 | [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), |
632 | [META_ID(PKTLEN)] = META_FUNC(int_pktlen), | |
633 | [META_ID(DATALEN)] = META_FUNC(int_datalen), | |
634 | [META_ID(MACLEN)] = META_FUNC(int_maclen), | |
82e91ffe | 635 | [META_ID(NFMARK)] = META_FUNC(int_mark), |
48900629 | 636 | [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
48900629 | 637 | [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
48900629 TG |
638 | [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
639 | [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), | |
640 | [META_ID(SK_STATE)] = META_FUNC(int_sk_state), | |
641 | [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), | |
642 | [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), | |
643 | [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), | |
644 | [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), | |
645 | [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), | |
646 | [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), | |
647 | [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), | |
648 | [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), | |
649 | [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), | |
650 | [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), | |
651 | [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), | |
652 | [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), | |
653 | [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), | |
654 | [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), | |
655 | [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), | |
656 | [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), | |
657 | [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), | |
81c3d547 | 658 | [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
48900629 TG |
659 | [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), |
660 | [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), | |
661 | [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), | |
662 | [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), | |
663 | [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), | |
664 | [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), | |
665 | [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), | |
666 | [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), | |
667 | [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), | |
3113e88c | 668 | [META_ID(VLAN_TAG)] = META_FUNC(int_vlan_tag), |
c2e3143e | 669 | [META_ID(RXHASH)] = META_FUNC(int_rxhash), |
1da177e4 LT |
670 | } |
671 | }; | |
672 | ||
cc7ec456 | 673 | static inline struct meta_ops *meta_ops(struct meta_value *val) |
1da177e4 LT |
674 | { |
675 | return &__meta_ops[meta_type(val)][meta_id(val)]; | |
676 | } | |
677 | ||
678 | /************************************************************************** | |
679 | * Type specific operations for TCF_META_TYPE_VAR | |
680 | **************************************************************************/ | |
681 | ||
682 | static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) | |
683 | { | |
684 | int r = a->len - b->len; | |
685 | ||
686 | if (r == 0) | |
687 | r = memcmp((void *) a->value, (void *) b->value, a->len); | |
688 | ||
689 | return r; | |
690 | } | |
691 | ||
add93b61 | 692 | static int meta_var_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 693 | { |
add93b61 | 694 | int len = nla_len(nla); |
1da177e4 | 695 | |
add93b61 | 696 | dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); |
1da177e4 LT |
697 | if (dst->val == 0UL) |
698 | return -ENOMEM; | |
1da177e4 LT |
699 | dst->len = len; |
700 | return 0; | |
701 | } | |
702 | ||
703 | static void meta_var_destroy(struct meta_value *v) | |
704 | { | |
a51482bd | 705 | kfree((void *) v->val); |
1da177e4 LT |
706 | } |
707 | ||
708 | static void meta_var_apply_extras(struct meta_value *v, | |
709 | struct meta_obj *dst) | |
710 | { | |
711 | int shift = v->hdr.shift; | |
712 | ||
713 | if (shift && shift < dst->len) | |
714 | dst->len -= shift; | |
715 | } | |
716 | ||
717 | static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
718 | { | |
1b34ec43 DM |
719 | if (v->val && v->len && |
720 | nla_put(skb, tlv, v->len, (void *) v->val)) | |
721 | goto nla_put_failure; | |
1da177e4 LT |
722 | return 0; |
723 | ||
add93b61 | 724 | nla_put_failure: |
1da177e4 LT |
725 | return -1; |
726 | } | |
727 | ||
728 | /************************************************************************** | |
729 | * Type specific operations for TCF_META_TYPE_INT | |
730 | **************************************************************************/ | |
731 | ||
732 | static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) | |
733 | { | |
734 | /* Let gcc optimize it, the unlikely is not really based on | |
735 | * some numbers but jump free code for mismatches seems | |
736 | * more logical. */ | |
98e56405 | 737 | if (unlikely(a->value == b->value)) |
1da177e4 | 738 | return 0; |
98e56405 | 739 | else if (a->value < b->value) |
1da177e4 LT |
740 | return -1; |
741 | else | |
742 | return 1; | |
743 | } | |
744 | ||
add93b61 | 745 | static int meta_int_change(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 746 | { |
add93b61 PM |
747 | if (nla_len(nla) >= sizeof(unsigned long)) { |
748 | dst->val = *(unsigned long *) nla_data(nla); | |
1da177e4 | 749 | dst->len = sizeof(unsigned long); |
add93b61 | 750 | } else if (nla_len(nla) == sizeof(u32)) { |
1587bac4 | 751 | dst->val = nla_get_u32(nla); |
1da177e4 LT |
752 | dst->len = sizeof(u32); |
753 | } else | |
754 | return -EINVAL; | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | static void meta_int_apply_extras(struct meta_value *v, | |
760 | struct meta_obj *dst) | |
761 | { | |
762 | if (v->hdr.shift) | |
763 | dst->value >>= v->hdr.shift; | |
764 | ||
765 | if (v->val) | |
766 | dst->value &= v->val; | |
767 | } | |
768 | ||
769 | static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) | |
770 | { | |
1b34ec43 DM |
771 | if (v->len == sizeof(unsigned long)) { |
772 | if (nla_put(skb, tlv, sizeof(unsigned long), &v->val)) | |
773 | goto nla_put_failure; | |
774 | } else if (v->len == sizeof(u32)) { | |
775 | if (nla_put_u32(skb, tlv, v->val)) | |
776 | goto nla_put_failure; | |
777 | } | |
1da177e4 LT |
778 | |
779 | return 0; | |
780 | ||
add93b61 | 781 | nla_put_failure: |
1da177e4 LT |
782 | return -1; |
783 | } | |
784 | ||
785 | /************************************************************************** | |
786 | * Type specific operations table | |
787 | **************************************************************************/ | |
788 | ||
cc7ec456 | 789 | struct meta_type_ops { |
1da177e4 LT |
790 | void (*destroy)(struct meta_value *); |
791 | int (*compare)(struct meta_obj *, struct meta_obj *); | |
add93b61 | 792 | int (*change)(struct meta_value *, struct nlattr *); |
1da177e4 LT |
793 | void (*apply_extras)(struct meta_value *, struct meta_obj *); |
794 | int (*dump)(struct sk_buff *, struct meta_value *, int); | |
795 | }; | |
796 | ||
cfe2f14c | 797 | static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = { |
1da177e4 LT |
798 | [TCF_META_TYPE_VAR] = { |
799 | .destroy = meta_var_destroy, | |
800 | .compare = meta_var_compare, | |
801 | .change = meta_var_change, | |
802 | .apply_extras = meta_var_apply_extras, | |
803 | .dump = meta_var_dump | |
804 | }, | |
805 | [TCF_META_TYPE_INT] = { | |
806 | .compare = meta_int_compare, | |
807 | .change = meta_int_change, | |
808 | .apply_extras = meta_int_apply_extras, | |
809 | .dump = meta_int_dump | |
810 | } | |
811 | }; | |
812 | ||
cfe2f14c | 813 | static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v) |
1da177e4 LT |
814 | { |
815 | return &__meta_type_ops[meta_type(v)]; | |
816 | } | |
817 | ||
818 | /************************************************************************** | |
819 | * Core | |
820 | **************************************************************************/ | |
821 | ||
ed7af3b3 SH |
822 | static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, |
823 | struct meta_value *v, struct meta_obj *dst) | |
1da177e4 LT |
824 | { |
825 | int err = 0; | |
826 | ||
827 | if (meta_id(v) == TCF_META_ID_VALUE) { | |
828 | dst->value = v->val; | |
829 | dst->len = v->len; | |
830 | return 0; | |
831 | } | |
832 | ||
833 | meta_ops(v)->get(skb, info, v, dst, &err); | |
834 | if (err < 0) | |
835 | return err; | |
836 | ||
837 | if (meta_type_ops(v)->apply_extras) | |
cc7ec456 | 838 | meta_type_ops(v)->apply_extras(v, dst); |
1da177e4 LT |
839 | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, | |
844 | struct tcf_pkt_info *info) | |
845 | { | |
846 | int r; | |
847 | struct meta_match *meta = (struct meta_match *) m->data; | |
848 | struct meta_obj l_value, r_value; | |
849 | ||
850 | if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || | |
851 | meta_get(skb, info, &meta->rvalue, &r_value) < 0) | |
852 | return 0; | |
853 | ||
854 | r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); | |
855 | ||
856 | switch (meta->lvalue.hdr.op) { | |
cc7ec456 ED |
857 | case TCF_EM_OPND_EQ: |
858 | return !r; | |
859 | case TCF_EM_OPND_LT: | |
860 | return r < 0; | |
861 | case TCF_EM_OPND_GT: | |
862 | return r > 0; | |
1da177e4 LT |
863 | } |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
ed7af3b3 | 868 | static void meta_delete(struct meta_match *meta) |
1da177e4 | 869 | { |
04f217ac | 870 | if (meta) { |
cfe2f14c | 871 | const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); |
1da177e4 | 872 | |
04f217ac SH |
873 | if (ops && ops->destroy) { |
874 | ops->destroy(&meta->lvalue); | |
875 | ops->destroy(&meta->rvalue); | |
876 | } | |
1da177e4 LT |
877 | } |
878 | ||
879 | kfree(meta); | |
880 | } | |
881 | ||
add93b61 | 882 | static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) |
1da177e4 | 883 | { |
add93b61 PM |
884 | if (nla) { |
885 | if (nla_len(nla) == 0) | |
1da177e4 LT |
886 | return -EINVAL; |
887 | ||
add93b61 | 888 | return meta_type_ops(dst)->change(dst, nla); |
1da177e4 LT |
889 | } |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | static inline int meta_is_supported(struct meta_value *val) | |
895 | { | |
cc7ec456 | 896 | return !meta_id(val) || meta_ops(val)->get; |
1da177e4 LT |
897 | } |
898 | ||
7a9c1bd4 PM |
899 | static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = { |
900 | [TCA_EM_META_HDR] = { .len = sizeof(struct tcf_meta_hdr) }, | |
901 | }; | |
902 | ||
82a470f1 | 903 | static int em_meta_change(struct net *net, void *data, int len, |
1da177e4 LT |
904 | struct tcf_ematch *m) |
905 | { | |
cee63723 | 906 | int err; |
add93b61 | 907 | struct nlattr *tb[TCA_EM_META_MAX + 1]; |
1da177e4 LT |
908 | struct tcf_meta_hdr *hdr; |
909 | struct meta_match *meta = NULL; | |
10297b99 | 910 | |
8cb08174 JB |
911 | err = nla_parse_deprecated(tb, TCA_EM_META_MAX, data, len, |
912 | meta_policy, NULL); | |
cee63723 | 913 | if (err < 0) |
1da177e4 LT |
914 | goto errout; |
915 | ||
cee63723 | 916 | err = -EINVAL; |
7a9c1bd4 | 917 | if (tb[TCA_EM_META_HDR] == NULL) |
1da177e4 | 918 | goto errout; |
add93b61 | 919 | hdr = nla_data(tb[TCA_EM_META_HDR]); |
1da177e4 LT |
920 | |
921 | if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || | |
922 | TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || | |
923 | TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || | |
924 | TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) | |
925 | goto errout; | |
926 | ||
0da974f4 | 927 | meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
0c4e4020 | 928 | if (meta == NULL) { |
929 | err = -ENOMEM; | |
1da177e4 | 930 | goto errout; |
0c4e4020 | 931 | } |
1da177e4 LT |
932 | |
933 | memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); | |
934 | memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); | |
935 | ||
936 | if (!meta_is_supported(&meta->lvalue) || | |
937 | !meta_is_supported(&meta->rvalue)) { | |
938 | err = -EOPNOTSUPP; | |
939 | goto errout; | |
940 | } | |
941 | ||
add93b61 PM |
942 | if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 || |
943 | meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0) | |
1da177e4 LT |
944 | goto errout; |
945 | ||
946 | m->datalen = sizeof(*meta); | |
947 | m->data = (unsigned long) meta; | |
948 | ||
949 | err = 0; | |
950 | errout: | |
951 | if (err && meta) | |
952 | meta_delete(meta); | |
953 | return err; | |
954 | } | |
955 | ||
82a470f1 | 956 | static void em_meta_destroy(struct tcf_ematch *m) |
1da177e4 LT |
957 | { |
958 | if (m) | |
959 | meta_delete((struct meta_match *) m->data); | |
960 | } | |
961 | ||
962 | static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) | |
963 | { | |
964 | struct meta_match *meta = (struct meta_match *) em->data; | |
965 | struct tcf_meta_hdr hdr; | |
cfe2f14c | 966 | const struct meta_type_ops *ops; |
1da177e4 LT |
967 | |
968 | memset(&hdr, 0, sizeof(hdr)); | |
969 | memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); | |
970 | memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); | |
971 | ||
1b34ec43 DM |
972 | if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr)) |
973 | goto nla_put_failure; | |
1da177e4 LT |
974 | |
975 | ops = meta_type_ops(&meta->lvalue); | |
976 | if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || | |
977 | ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) | |
add93b61 | 978 | goto nla_put_failure; |
1da177e4 LT |
979 | |
980 | return 0; | |
981 | ||
add93b61 | 982 | nla_put_failure: |
1da177e4 | 983 | return -1; |
10297b99 | 984 | } |
1da177e4 LT |
985 | |
986 | static struct tcf_ematch_ops em_meta_ops = { | |
987 | .kind = TCF_EM_META, | |
988 | .change = em_meta_change, | |
989 | .match = em_meta_match, | |
990 | .destroy = em_meta_destroy, | |
991 | .dump = em_meta_dump, | |
992 | .owner = THIS_MODULE, | |
993 | .link = LIST_HEAD_INIT(em_meta_ops.link) | |
994 | }; | |
995 | ||
996 | static int __init init_em_meta(void) | |
997 | { | |
998 | return tcf_em_register(&em_meta_ops); | |
999 | } | |
1000 | ||
10297b99 | 1001 | static void __exit exit_em_meta(void) |
1da177e4 LT |
1002 | { |
1003 | tcf_em_unregister(&em_meta_ops); | |
1004 | } | |
1005 | ||
1006 | MODULE_LICENSE("GPL"); | |
1007 | ||
1008 | module_init(init_em_meta); | |
1009 | module_exit(exit_em_meta); | |
db3d99c0 PM |
1010 | |
1011 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |