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ef6980b6 JHS |
1 | /* |
2 | * net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB | |
3 | * | |
4 | * Refer to: | |
5 | * draft-ietf-forces-interfelfb-03 | |
6 | * and | |
7 | * netdev01 paper: | |
8 | * "Distributing Linux Traffic Control Classifier-Action | |
9 | * Subsystem" | |
10 | * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * copyright Jamal Hadi Salim (2015) | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/rtnetlink.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <net/net_namespace.h> | |
30 | #include <net/netlink.h> | |
31 | #include <net/pkt_sched.h> | |
32 | #include <uapi/linux/tc_act/tc_ife.h> | |
33 | #include <net/tc_act/tc_ife.h> | |
34 | #include <linux/etherdevice.h> | |
35 | ||
36 | #define IFE_TAB_MASK 15 | |
37 | ||
38 | static int ife_net_id; | |
39 | static int max_metacnt = IFE_META_MAX + 1; | |
40 | ||
41 | static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = { | |
42 | [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)}, | |
43 | [TCA_IFE_DMAC] = { .len = ETH_ALEN}, | |
44 | [TCA_IFE_SMAC] = { .len = ETH_ALEN}, | |
45 | [TCA_IFE_TYPE] = { .type = NLA_U16}, | |
46 | }; | |
47 | ||
48 | /* Caller takes care of presenting data in network order | |
49 | */ | |
50 | int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval) | |
51 | { | |
52 | u32 *tlv = (u32 *)(skbdata); | |
53 | u16 totlen = nla_total_size(dlen); /*alignment + hdr */ | |
54 | char *dptr = (char *)tlv + NLA_HDRLEN; | |
55 | u32 htlv = attrtype << 16 | totlen; | |
56 | ||
57 | *tlv = htonl(htlv); | |
58 | memset(dptr, 0, totlen - NLA_HDRLEN); | |
59 | memcpy(dptr, dval, dlen); | |
60 | ||
61 | return totlen; | |
62 | } | |
63 | EXPORT_SYMBOL_GPL(ife_tlv_meta_encode); | |
64 | ||
65 | int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) | |
66 | { | |
67 | if (mi->metaval) | |
68 | return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); | |
69 | else | |
70 | return nla_put(skb, mi->metaid, 0, NULL); | |
71 | } | |
72 | EXPORT_SYMBOL_GPL(ife_get_meta_u32); | |
73 | ||
74 | int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) | |
75 | { | |
76 | if (metaval || mi->metaval) | |
77 | return 8; /* T+L+V == 2+2+4 */ | |
78 | ||
79 | return 0; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(ife_check_meta_u32); | |
82 | ||
83 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) | |
84 | { | |
85 | u32 edata = metaval; | |
86 | ||
87 | if (mi->metaval) | |
88 | edata = *(u32 *)mi->metaval; | |
89 | else if (metaval) | |
90 | edata = metaval; | |
91 | ||
92 | if (!edata) /* will not encode */ | |
93 | return 0; | |
94 | ||
95 | edata = htonl(edata); | |
96 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
99 | ||
100 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
101 | { | |
102 | if (mi->metaval) | |
103 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
104 | else | |
105 | return nla_put(skb, mi->metaid, 0, NULL); | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
108 | ||
109 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval) | |
110 | { | |
d1491fa5 | 111 | mi->metaval = kmemdup(metaval, sizeof(u32), GFP_KERNEL); |
ef6980b6 JHS |
112 | if (!mi->metaval) |
113 | return -ENOMEM; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
118 | ||
119 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval) | |
120 | { | |
d1491fa5 | 121 | mi->metaval = kmemdup(metaval, sizeof(u16), GFP_KERNEL); |
ef6980b6 JHS |
122 | if (!mi->metaval) |
123 | return -ENOMEM; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
128 | ||
129 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
130 | { | |
131 | kfree(mi->metaval); | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
134 | ||
135 | int ife_validate_meta_u32(void *val, int len) | |
136 | { | |
137 | if (len == 4) | |
138 | return 0; | |
139 | ||
140 | return -EINVAL; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
143 | ||
144 | int ife_validate_meta_u16(void *val, int len) | |
145 | { | |
146 | /* length will include padding */ | |
147 | if (len == NLA_ALIGN(2)) | |
148 | return 0; | |
149 | ||
150 | return -EINVAL; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
153 | ||
154 | static LIST_HEAD(ifeoplist); | |
155 | static DEFINE_RWLOCK(ife_mod_lock); | |
156 | ||
157 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
158 | { | |
159 | struct tcf_meta_ops *o; | |
160 | ||
161 | read_lock(&ife_mod_lock); | |
162 | list_for_each_entry(o, &ifeoplist, list) { | |
163 | if (o->metaid == metaid) { | |
164 | if (!try_module_get(o->owner)) | |
165 | o = NULL; | |
166 | read_unlock(&ife_mod_lock); | |
167 | return o; | |
168 | } | |
169 | } | |
170 | read_unlock(&ife_mod_lock); | |
171 | ||
172 | return NULL; | |
173 | } | |
174 | ||
175 | int register_ife_op(struct tcf_meta_ops *mops) | |
176 | { | |
177 | struct tcf_meta_ops *m; | |
178 | ||
179 | if (!mops->metaid || !mops->metatype || !mops->name || | |
180 | !mops->check_presence || !mops->encode || !mops->decode || | |
181 | !mops->get || !mops->alloc) | |
182 | return -EINVAL; | |
183 | ||
184 | write_lock(&ife_mod_lock); | |
185 | ||
186 | list_for_each_entry(m, &ifeoplist, list) { | |
187 | if (m->metaid == mops->metaid || | |
188 | (strcmp(mops->name, m->name) == 0)) { | |
189 | write_unlock(&ife_mod_lock); | |
190 | return -EEXIST; | |
191 | } | |
192 | } | |
193 | ||
194 | if (!mops->release) | |
195 | mops->release = ife_release_meta_gen; | |
196 | ||
197 | list_add_tail(&mops->list, &ifeoplist); | |
198 | write_unlock(&ife_mod_lock); | |
199 | return 0; | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
202 | ||
203 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
204 | { | |
205 | struct tcf_meta_ops *m; | |
206 | int err = -ENOENT; | |
207 | ||
208 | write_lock(&ife_mod_lock); | |
209 | list_for_each_entry(m, &ifeoplist, list) { | |
210 | if (m->metaid == mops->metaid) { | |
211 | list_del(&mops->list); | |
212 | err = 0; | |
213 | break; | |
214 | } | |
215 | } | |
216 | write_unlock(&ife_mod_lock); | |
217 | ||
218 | return err; | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(register_ife_op); | |
221 | ||
222 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
223 | { | |
224 | int ret = 0; | |
225 | /* XXX: unfortunately cant use nla_policy at this point | |
226 | * because a length of 0 is valid in the case of | |
227 | * "allow". "use" semantics do enforce for proper | |
228 | * length and i couldve use nla_policy but it makes it hard | |
229 | * to use it just for that.. | |
230 | */ | |
231 | if (ops->validate) | |
232 | return ops->validate(val, len); | |
233 | ||
234 | if (ops->metatype == NLA_U32) | |
235 | ret = ife_validate_meta_u32(val, len); | |
236 | else if (ops->metatype == NLA_U16) | |
237 | ret = ife_validate_meta_u16(val, len); | |
238 | ||
239 | return ret; | |
240 | } | |
241 | ||
242 | /* called when adding new meta information | |
243 | * under ife->tcf_lock | |
244 | */ | |
245 | static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, | |
246 | void *val, int len) | |
247 | { | |
248 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
249 | int ret = 0; | |
250 | ||
251 | if (!ops) { | |
252 | ret = -ENOENT; | |
253 | #ifdef CONFIG_MODULES | |
254 | spin_unlock_bh(&ife->tcf_lock); | |
255 | rtnl_unlock(); | |
256 | request_module("ifemeta%u", metaid); | |
257 | rtnl_lock(); | |
258 | spin_lock_bh(&ife->tcf_lock); | |
259 | ops = find_ife_oplist(metaid); | |
260 | #endif | |
261 | } | |
262 | ||
263 | if (ops) { | |
264 | ret = 0; | |
265 | if (len) | |
266 | ret = ife_validate_metatype(ops, val, len); | |
267 | ||
268 | module_put(ops->owner); | |
269 | } | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | /* called when adding new meta information | |
275 | * under ife->tcf_lock | |
276 | */ | |
277 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
278 | int len) | |
279 | { | |
280 | struct tcf_meta_info *mi = NULL; | |
281 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
282 | int ret = 0; | |
283 | ||
284 | if (!ops) | |
285 | return -ENOENT; | |
286 | ||
287 | mi = kzalloc(sizeof(*mi), GFP_KERNEL); | |
288 | if (!mi) { | |
289 | /*put back what find_ife_oplist took */ | |
290 | module_put(ops->owner); | |
291 | return -ENOMEM; | |
292 | } | |
293 | ||
294 | mi->metaid = metaid; | |
295 | mi->ops = ops; | |
296 | if (len > 0) { | |
297 | ret = ops->alloc(mi, metaval); | |
298 | if (ret != 0) { | |
299 | kfree(mi); | |
300 | module_put(ops->owner); | |
301 | return ret; | |
302 | } | |
303 | } | |
304 | ||
305 | list_add_tail(&mi->metalist, &ife->metalist); | |
306 | ||
307 | return ret; | |
308 | } | |
309 | ||
310 | static int use_all_metadata(struct tcf_ife_info *ife) | |
311 | { | |
312 | struct tcf_meta_ops *o; | |
313 | int rc = 0; | |
314 | int installed = 0; | |
315 | ||
316 | list_for_each_entry(o, &ifeoplist, list) { | |
317 | rc = add_metainfo(ife, o->metaid, NULL, 0); | |
318 | if (rc == 0) | |
319 | installed += 1; | |
320 | } | |
321 | ||
322 | if (installed) | |
323 | return 0; | |
324 | else | |
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
329 | { | |
330 | struct tcf_meta_info *e; | |
331 | struct nlattr *nest; | |
332 | unsigned char *b = skb_tail_pointer(skb); | |
333 | int total_encoded = 0; | |
334 | ||
335 | /*can only happen on decode */ | |
336 | if (list_empty(&ife->metalist)) | |
337 | return 0; | |
338 | ||
339 | nest = nla_nest_start(skb, TCA_IFE_METALST); | |
340 | if (!nest) | |
341 | goto out_nlmsg_trim; | |
342 | ||
343 | list_for_each_entry(e, &ife->metalist, metalist) { | |
344 | if (!e->ops->get(skb, e)) | |
345 | total_encoded += 1; | |
346 | } | |
347 | ||
348 | if (!total_encoded) | |
349 | goto out_nlmsg_trim; | |
350 | ||
351 | nla_nest_end(skb, nest); | |
352 | ||
353 | return 0; | |
354 | ||
355 | out_nlmsg_trim: | |
356 | nlmsg_trim(skb, b); | |
357 | return -1; | |
358 | } | |
359 | ||
360 | /* under ife->tcf_lock */ | |
361 | static void _tcf_ife_cleanup(struct tc_action *a, int bind) | |
362 | { | |
363 | struct tcf_ife_info *ife = a->priv; | |
364 | struct tcf_meta_info *e, *n; | |
365 | ||
366 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
367 | module_put(e->ops->owner); | |
368 | list_del(&e->metalist); | |
369 | if (e->metaval) { | |
370 | if (e->ops->release) | |
371 | e->ops->release(e); | |
372 | else | |
373 | kfree(e->metaval); | |
374 | } | |
375 | kfree(e); | |
376 | } | |
377 | } | |
378 | ||
379 | static void tcf_ife_cleanup(struct tc_action *a, int bind) | |
380 | { | |
381 | struct tcf_ife_info *ife = a->priv; | |
382 | ||
383 | spin_lock_bh(&ife->tcf_lock); | |
384 | _tcf_ife_cleanup(a, bind); | |
385 | spin_unlock_bh(&ife->tcf_lock); | |
386 | } | |
387 | ||
388 | /* under ife->tcf_lock */ | |
389 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb) | |
390 | { | |
391 | int len = 0; | |
392 | int rc = 0; | |
393 | int i = 0; | |
394 | void *val; | |
395 | ||
396 | for (i = 1; i < max_metacnt; i++) { | |
397 | if (tb[i]) { | |
398 | val = nla_data(tb[i]); | |
399 | len = nla_len(tb[i]); | |
400 | ||
401 | rc = load_metaops_and_vet(ife, i, val, len); | |
402 | if (rc != 0) | |
403 | return rc; | |
404 | ||
405 | rc = add_metainfo(ife, i, val, len); | |
406 | if (rc) | |
407 | return rc; | |
408 | } | |
409 | } | |
410 | ||
411 | return rc; | |
412 | } | |
413 | ||
414 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
415 | struct nlattr *est, struct tc_action *a, | |
416 | int ovr, int bind) | |
417 | { | |
418 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
419 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
420 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
421 | struct tcf_ife_info *ife; | |
422 | struct tc_ife *parm; | |
423 | u16 ife_type = 0; | |
424 | u8 *daddr = NULL; | |
425 | u8 *saddr = NULL; | |
4e8c8615 | 426 | int ret = 0, exists = 0; |
ef6980b6 JHS |
427 | int err; |
428 | ||
429 | err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy); | |
430 | if (err < 0) | |
431 | return err; | |
432 | ||
433 | if (!tb[TCA_IFE_PARMS]) | |
434 | return -EINVAL; | |
435 | ||
436 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
437 | ||
4e8c8615 JHS |
438 | exists = tcf_hash_check(tn, parm->index, a, bind); |
439 | if (exists && bind) | |
440 | return 0; | |
441 | ||
ef6980b6 JHS |
442 | if (parm->flags & IFE_ENCODE) { |
443 | /* Until we get issued the ethertype, we cant have | |
444 | * a default.. | |
445 | **/ | |
446 | if (!tb[TCA_IFE_TYPE]) { | |
4e8c8615 JHS |
447 | if (exists) |
448 | tcf_hash_release(a, bind); | |
ef6980b6 JHS |
449 | pr_info("You MUST pass etherype for encoding\n"); |
450 | return -EINVAL; | |
451 | } | |
452 | } | |
453 | ||
4e8c8615 | 454 | if (!exists) { |
ef6980b6 JHS |
455 | ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife), |
456 | bind, false); | |
457 | if (ret) | |
458 | return ret; | |
459 | ret = ACT_P_CREATED; | |
460 | } else { | |
ef6980b6 JHS |
461 | tcf_hash_release(a, bind); |
462 | if (!ovr) | |
463 | return -EEXIST; | |
464 | } | |
465 | ||
466 | ife = to_ife(a); | |
467 | ife->flags = parm->flags; | |
468 | ||
469 | if (parm->flags & IFE_ENCODE) { | |
470 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
471 | if (tb[TCA_IFE_DMAC]) | |
472 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
473 | if (tb[TCA_IFE_SMAC]) | |
474 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
475 | } | |
476 | ||
477 | spin_lock_bh(&ife->tcf_lock); | |
478 | ife->tcf_action = parm->action; | |
479 | ||
480 | if (parm->flags & IFE_ENCODE) { | |
481 | if (daddr) | |
482 | ether_addr_copy(ife->eth_dst, daddr); | |
483 | else | |
484 | eth_zero_addr(ife->eth_dst); | |
485 | ||
486 | if (saddr) | |
487 | ether_addr_copy(ife->eth_src, saddr); | |
488 | else | |
489 | eth_zero_addr(ife->eth_src); | |
490 | ||
491 | ife->eth_type = ife_type; | |
492 | } | |
493 | ||
494 | if (ret == ACT_P_CREATED) | |
495 | INIT_LIST_HEAD(&ife->metalist); | |
496 | ||
497 | if (tb[TCA_IFE_METALST]) { | |
498 | err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], | |
499 | NULL); | |
500 | if (err) { | |
501 | metadata_parse_err: | |
4e8c8615 JHS |
502 | if (exists) |
503 | tcf_hash_release(a, bind); | |
ef6980b6 JHS |
504 | if (ret == ACT_P_CREATED) |
505 | _tcf_ife_cleanup(a, bind); | |
506 | ||
507 | spin_unlock_bh(&ife->tcf_lock); | |
508 | return err; | |
509 | } | |
510 | ||
511 | err = populate_metalist(ife, tb2); | |
512 | if (err) | |
513 | goto metadata_parse_err; | |
514 | ||
515 | } else { | |
516 | /* if no passed metadata allow list or passed allow-all | |
517 | * then here we process by adding as many supported metadatum | |
518 | * as we can. You better have at least one else we are | |
519 | * going to bail out | |
520 | */ | |
521 | err = use_all_metadata(ife); | |
522 | if (err) { | |
523 | if (ret == ACT_P_CREATED) | |
524 | _tcf_ife_cleanup(a, bind); | |
525 | ||
526 | spin_unlock_bh(&ife->tcf_lock); | |
527 | return err; | |
528 | } | |
529 | } | |
530 | ||
531 | spin_unlock_bh(&ife->tcf_lock); | |
532 | ||
533 | if (ret == ACT_P_CREATED) | |
534 | tcf_hash_insert(tn, a); | |
535 | ||
536 | return ret; | |
537 | } | |
538 | ||
539 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
540 | int ref) | |
541 | { | |
542 | unsigned char *b = skb_tail_pointer(skb); | |
543 | struct tcf_ife_info *ife = a->priv; | |
544 | struct tc_ife opt = { | |
545 | .index = ife->tcf_index, | |
546 | .refcnt = ife->tcf_refcnt - ref, | |
547 | .bindcnt = ife->tcf_bindcnt - bind, | |
548 | .action = ife->tcf_action, | |
549 | .flags = ife->flags, | |
550 | }; | |
551 | struct tcf_t t; | |
552 | ||
553 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) | |
554 | goto nla_put_failure; | |
555 | ||
556 | t.install = jiffies_to_clock_t(jiffies - ife->tcf_tm.install); | |
557 | t.lastuse = jiffies_to_clock_t(jiffies - ife->tcf_tm.lastuse); | |
558 | t.expires = jiffies_to_clock_t(ife->tcf_tm.expires); | |
9854518e | 559 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
560 | goto nla_put_failure; |
561 | ||
562 | if (!is_zero_ether_addr(ife->eth_dst)) { | |
563 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) | |
564 | goto nla_put_failure; | |
565 | } | |
566 | ||
567 | if (!is_zero_ether_addr(ife->eth_src)) { | |
568 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) | |
569 | goto nla_put_failure; | |
570 | } | |
571 | ||
572 | if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) | |
573 | goto nla_put_failure; | |
574 | ||
575 | if (dump_metalist(skb, ife)) { | |
576 | /*ignore failure to dump metalist */ | |
577 | pr_info("Failed to dump metalist\n"); | |
578 | } | |
579 | ||
580 | return skb->len; | |
581 | ||
582 | nla_put_failure: | |
583 | nlmsg_trim(skb, b); | |
584 | return -1; | |
585 | } | |
586 | ||
587 | int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, | |
588 | u16 metaid, u16 mlen, void *mdata) | |
589 | { | |
590 | struct tcf_meta_info *e; | |
591 | ||
592 | /* XXX: use hash to speed up */ | |
593 | list_for_each_entry(e, &ife->metalist, metalist) { | |
594 | if (metaid == e->metaid) { | |
595 | if (e->ops) { | |
596 | /* We check for decode presence already */ | |
597 | return e->ops->decode(skb, mdata, mlen); | |
598 | } | |
599 | } | |
600 | } | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | struct ifeheadr { | |
606 | __be16 metalen; | |
607 | u8 tlv_data[]; | |
608 | }; | |
609 | ||
610 | struct meta_tlvhdr { | |
611 | __be16 type; | |
612 | __be16 len; | |
613 | }; | |
614 | ||
615 | static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, | |
616 | struct tcf_result *res) | |
617 | { | |
618 | struct tcf_ife_info *ife = a->priv; | |
619 | int action = ife->tcf_action; | |
620 | struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data; | |
621 | u16 ifehdrln = ifehdr->metalen; | |
622 | struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data); | |
623 | ||
624 | spin_lock(&ife->tcf_lock); | |
625 | bstats_update(&ife->tcf_bstats, skb); | |
626 | ife->tcf_tm.lastuse = jiffies; | |
627 | spin_unlock(&ife->tcf_lock); | |
628 | ||
629 | ifehdrln = ntohs(ifehdrln); | |
630 | if (unlikely(!pskb_may_pull(skb, ifehdrln))) { | |
631 | spin_lock(&ife->tcf_lock); | |
632 | ife->tcf_qstats.drops++; | |
633 | spin_unlock(&ife->tcf_lock); | |
634 | return TC_ACT_SHOT; | |
635 | } | |
636 | ||
637 | skb_set_mac_header(skb, ifehdrln); | |
638 | __skb_pull(skb, ifehdrln); | |
639 | skb->protocol = eth_type_trans(skb, skb->dev); | |
640 | ifehdrln -= IFE_METAHDRLEN; | |
641 | ||
642 | while (ifehdrln > 0) { | |
643 | u8 *tlvdata = (u8 *)tlv; | |
644 | u16 mtype = tlv->type; | |
645 | u16 mlen = tlv->len; | |
646 | ||
647 | mtype = ntohs(mtype); | |
648 | mlen = ntohs(mlen); | |
649 | ||
650 | if (find_decode_metaid(skb, ife, mtype, (mlen - 4), | |
651 | (void *)(tlvdata + 4))) { | |
652 | /* abuse overlimits to count when we receive metadata | |
653 | * but dont have an ops for it | |
654 | */ | |
655 | pr_info_ratelimited("Unknown metaid %d alnlen %d\n", | |
656 | mtype, mlen); | |
657 | ife->tcf_qstats.overlimits++; | |
658 | } | |
659 | ||
660 | tlvdata += mlen; | |
661 | ifehdrln -= mlen; | |
662 | tlv = (struct meta_tlvhdr *)tlvdata; | |
663 | } | |
664 | ||
665 | skb_reset_network_header(skb); | |
666 | return action; | |
667 | } | |
668 | ||
669 | /*XXX: check if we can do this at install time instead of current | |
670 | * send data path | |
671 | **/ | |
672 | static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) | |
673 | { | |
674 | struct tcf_meta_info *e, *n; | |
675 | int tot_run_sz = 0, run_sz = 0; | |
676 | ||
677 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
678 | if (e->ops->check_presence) { | |
679 | run_sz = e->ops->check_presence(skb, e); | |
680 | tot_run_sz += run_sz; | |
681 | } | |
682 | } | |
683 | ||
684 | return tot_run_sz; | |
685 | } | |
686 | ||
687 | static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, | |
688 | struct tcf_result *res) | |
689 | { | |
690 | struct tcf_ife_info *ife = a->priv; | |
691 | int action = ife->tcf_action; | |
692 | struct ethhdr *oethh; /* outer ether header */ | |
693 | struct ethhdr *iethh; /* inner eth header */ | |
694 | struct tcf_meta_info *e; | |
695 | /* | |
696 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
697 | where ORIGDATA = original ethernet header ... | |
698 | */ | |
699 | u16 metalen = ife_get_sz(skb, ife); | |
700 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
701 | unsigned int skboff = skb->dev->hard_header_len; | |
702 | u32 at = G_TC_AT(skb->tc_verd); | |
703 | int new_len = skb->len + hdrm; | |
704 | bool exceed_mtu = false; | |
705 | int err; | |
706 | ||
707 | if (at & AT_EGRESS) { | |
708 | if (new_len > skb->dev->mtu) | |
709 | exceed_mtu = true; | |
710 | } | |
711 | ||
712 | spin_lock(&ife->tcf_lock); | |
713 | bstats_update(&ife->tcf_bstats, skb); | |
714 | ife->tcf_tm.lastuse = jiffies; | |
715 | ||
716 | if (!metalen) { /* no metadata to send */ | |
717 | /* abuse overlimits to count when we allow packet | |
718 | * with no metadata | |
719 | */ | |
720 | ife->tcf_qstats.overlimits++; | |
721 | spin_unlock(&ife->tcf_lock); | |
722 | return action; | |
723 | } | |
724 | /* could be stupid policy setup or mtu config | |
725 | * so lets be conservative.. */ | |
726 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
727 | ife->tcf_qstats.drops++; | |
728 | spin_unlock(&ife->tcf_lock); | |
729 | return TC_ACT_SHOT; | |
730 | } | |
731 | ||
732 | iethh = eth_hdr(skb); | |
733 | ||
734 | err = skb_cow_head(skb, hdrm); | |
735 | if (unlikely(err)) { | |
736 | ife->tcf_qstats.drops++; | |
737 | spin_unlock(&ife->tcf_lock); | |
738 | return TC_ACT_SHOT; | |
739 | } | |
740 | ||
741 | if (!(at & AT_EGRESS)) | |
742 | skb_push(skb, skb->dev->hard_header_len); | |
743 | ||
744 | __skb_push(skb, hdrm); | |
745 | memcpy(skb->data, iethh, skb->mac_len); | |
746 | skb_reset_mac_header(skb); | |
747 | oethh = eth_hdr(skb); | |
748 | ||
749 | /*total metadata length */ | |
750 | metalen += IFE_METAHDRLEN; | |
751 | metalen = htons(metalen); | |
752 | memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN); | |
753 | skboff += IFE_METAHDRLEN; | |
754 | ||
755 | /* XXX: we dont have a clever way of telling encode to | |
756 | * not repeat some of the computations that are done by | |
757 | * ops->presence_check... | |
758 | */ | |
759 | list_for_each_entry(e, &ife->metalist, metalist) { | |
760 | if (e->ops->encode) { | |
761 | err = e->ops->encode(skb, (void *)(skb->data + skboff), | |
762 | e); | |
763 | } | |
764 | if (err < 0) { | |
765 | /* too corrupt to keep around if overwritten */ | |
766 | ife->tcf_qstats.drops++; | |
767 | spin_unlock(&ife->tcf_lock); | |
768 | return TC_ACT_SHOT; | |
769 | } | |
770 | skboff += err; | |
771 | } | |
772 | ||
773 | if (!is_zero_ether_addr(ife->eth_src)) | |
774 | ether_addr_copy(oethh->h_source, ife->eth_src); | |
775 | else | |
776 | ether_addr_copy(oethh->h_source, iethh->h_source); | |
777 | if (!is_zero_ether_addr(ife->eth_dst)) | |
778 | ether_addr_copy(oethh->h_dest, ife->eth_dst); | |
779 | else | |
780 | ether_addr_copy(oethh->h_dest, iethh->h_dest); | |
781 | oethh->h_proto = htons(ife->eth_type); | |
782 | ||
783 | if (!(at & AT_EGRESS)) | |
784 | skb_pull(skb, skb->dev->hard_header_len); | |
785 | ||
786 | spin_unlock(&ife->tcf_lock); | |
787 | ||
788 | return action; | |
789 | } | |
790 | ||
791 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
792 | struct tcf_result *res) | |
793 | { | |
794 | struct tcf_ife_info *ife = a->priv; | |
795 | ||
796 | if (ife->flags & IFE_ENCODE) | |
797 | return tcf_ife_encode(skb, a, res); | |
798 | ||
799 | if (!(ife->flags & IFE_ENCODE)) | |
800 | return tcf_ife_decode(skb, a, res); | |
801 | ||
802 | pr_info_ratelimited("unknown failure(policy neither de/encode\n"); | |
803 | spin_lock(&ife->tcf_lock); | |
804 | bstats_update(&ife->tcf_bstats, skb); | |
805 | ife->tcf_tm.lastuse = jiffies; | |
806 | ife->tcf_qstats.drops++; | |
807 | spin_unlock(&ife->tcf_lock); | |
808 | ||
809 | return TC_ACT_SHOT; | |
810 | } | |
811 | ||
812 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
813 | struct netlink_callback *cb, int type, | |
814 | struct tc_action *a) | |
815 | { | |
816 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
817 | ||
818 | return tcf_generic_walker(tn, skb, cb, type, a); | |
819 | } | |
820 | ||
821 | static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index) | |
822 | { | |
823 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
824 | ||
825 | return tcf_hash_search(tn, a, index); | |
826 | } | |
827 | ||
828 | static struct tc_action_ops act_ife_ops = { | |
829 | .kind = "ife", | |
830 | .type = TCA_ACT_IFE, | |
831 | .owner = THIS_MODULE, | |
832 | .act = tcf_ife_act, | |
833 | .dump = tcf_ife_dump, | |
834 | .cleanup = tcf_ife_cleanup, | |
835 | .init = tcf_ife_init, | |
836 | .walk = tcf_ife_walker, | |
837 | .lookup = tcf_ife_search, | |
838 | }; | |
839 | ||
840 | static __net_init int ife_init_net(struct net *net) | |
841 | { | |
842 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
843 | ||
844 | return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK); | |
845 | } | |
846 | ||
847 | static void __net_exit ife_exit_net(struct net *net) | |
848 | { | |
849 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
850 | ||
851 | tc_action_net_exit(tn); | |
852 | } | |
853 | ||
854 | static struct pernet_operations ife_net_ops = { | |
855 | .init = ife_init_net, | |
856 | .exit = ife_exit_net, | |
857 | .id = &ife_net_id, | |
858 | .size = sizeof(struct tc_action_net), | |
859 | }; | |
860 | ||
861 | static int __init ife_init_module(void) | |
862 | { | |
863 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
864 | } | |
865 | ||
866 | static void __exit ife_cleanup_module(void) | |
867 | { | |
868 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
869 | } | |
870 | ||
871 | module_init(ife_init_module); | |
872 | module_exit(ife_cleanup_module); | |
873 | ||
874 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
875 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
876 | MODULE_LICENSE("GPL"); |