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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> | |
295a6e06 | 35 | #include <net/ife.h> |
ef6980b6 JHS |
36 | |
37 | #define IFE_TAB_MASK 15 | |
38 | ||
c7d03a00 | 39 | static unsigned int ife_net_id; |
ef6980b6 | 40 | static int max_metacnt = IFE_META_MAX + 1; |
a85a970a | 41 | static struct tc_action_ops act_ife_ops; |
ef6980b6 JHS |
42 | |
43 | static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = { | |
44 | [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)}, | |
45 | [TCA_IFE_DMAC] = { .len = ETH_ALEN}, | |
46 | [TCA_IFE_SMAC] = { .len = ETH_ALEN}, | |
47 | [TCA_IFE_TYPE] = { .type = NLA_U16}, | |
48 | }; | |
49 | ||
6a5d58b6 JHS |
50 | int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi) |
51 | { | |
52 | u16 edata = 0; | |
53 | ||
54 | if (mi->metaval) | |
55 | edata = *(u16 *)mi->metaval; | |
56 | else if (metaval) | |
57 | edata = metaval; | |
58 | ||
59 | if (!edata) /* will not encode */ | |
60 | return 0; | |
61 | ||
62 | edata = htons(edata); | |
63 | return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata); | |
64 | } | |
65 | EXPORT_SYMBOL_GPL(ife_encode_meta_u16); | |
66 | ||
ef6980b6 JHS |
67 | int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) |
68 | { | |
69 | if (mi->metaval) | |
70 | return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); | |
71 | else | |
72 | return nla_put(skb, mi->metaid, 0, NULL); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(ife_get_meta_u32); | |
75 | ||
76 | int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) | |
77 | { | |
78 | if (metaval || mi->metaval) | |
79 | return 8; /* T+L+V == 2+2+4 */ | |
80 | ||
81 | return 0; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(ife_check_meta_u32); | |
84 | ||
6a5d58b6 JHS |
85 | int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi) |
86 | { | |
87 | if (metaval || mi->metaval) | |
88 | return 8; /* T+L+(V) == 2+2+(2+2bytepad) */ | |
89 | ||
90 | return 0; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(ife_check_meta_u16); | |
93 | ||
ef6980b6 JHS |
94 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) |
95 | { | |
96 | u32 edata = metaval; | |
97 | ||
98 | if (mi->metaval) | |
99 | edata = *(u32 *)mi->metaval; | |
100 | else if (metaval) | |
101 | edata = metaval; | |
102 | ||
103 | if (!edata) /* will not encode */ | |
104 | return 0; | |
105 | ||
106 | edata = htonl(edata); | |
107 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
110 | ||
111 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
112 | { | |
113 | if (mi->metaval) | |
114 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
115 | else | |
116 | return nla_put(skb, mi->metaid, 0, NULL); | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
119 | ||
067a7cd0 | 120 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 121 | { |
067a7cd0 | 122 | mi->metaval = kmemdup(metaval, sizeof(u32), gfp); |
ef6980b6 JHS |
123 | if (!mi->metaval) |
124 | return -ENOMEM; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
129 | ||
067a7cd0 | 130 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 131 | { |
067a7cd0 | 132 | mi->metaval = kmemdup(metaval, sizeof(u16), gfp); |
ef6980b6 JHS |
133 | if (!mi->metaval) |
134 | return -ENOMEM; | |
135 | ||
136 | return 0; | |
137 | } | |
138 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
139 | ||
140 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
141 | { | |
142 | kfree(mi->metaval); | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
145 | ||
146 | int ife_validate_meta_u32(void *val, int len) | |
147 | { | |
28a10c42 | 148 | if (len == sizeof(u32)) |
ef6980b6 JHS |
149 | return 0; |
150 | ||
151 | return -EINVAL; | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
154 | ||
155 | int ife_validate_meta_u16(void *val, int len) | |
156 | { | |
28a10c42 JHS |
157 | /* length will not include padding */ |
158 | if (len == sizeof(u16)) | |
ef6980b6 JHS |
159 | return 0; |
160 | ||
161 | return -EINVAL; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
164 | ||
165 | static LIST_HEAD(ifeoplist); | |
166 | static DEFINE_RWLOCK(ife_mod_lock); | |
167 | ||
168 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
169 | { | |
170 | struct tcf_meta_ops *o; | |
171 | ||
172 | read_lock(&ife_mod_lock); | |
173 | list_for_each_entry(o, &ifeoplist, list) { | |
174 | if (o->metaid == metaid) { | |
175 | if (!try_module_get(o->owner)) | |
176 | o = NULL; | |
177 | read_unlock(&ife_mod_lock); | |
178 | return o; | |
179 | } | |
180 | } | |
181 | read_unlock(&ife_mod_lock); | |
182 | ||
183 | return NULL; | |
184 | } | |
185 | ||
186 | int register_ife_op(struct tcf_meta_ops *mops) | |
187 | { | |
188 | struct tcf_meta_ops *m; | |
189 | ||
190 | if (!mops->metaid || !mops->metatype || !mops->name || | |
191 | !mops->check_presence || !mops->encode || !mops->decode || | |
192 | !mops->get || !mops->alloc) | |
193 | return -EINVAL; | |
194 | ||
195 | write_lock(&ife_mod_lock); | |
196 | ||
197 | list_for_each_entry(m, &ifeoplist, list) { | |
198 | if (m->metaid == mops->metaid || | |
199 | (strcmp(mops->name, m->name) == 0)) { | |
200 | write_unlock(&ife_mod_lock); | |
201 | return -EEXIST; | |
202 | } | |
203 | } | |
204 | ||
205 | if (!mops->release) | |
206 | mops->release = ife_release_meta_gen; | |
207 | ||
208 | list_add_tail(&mops->list, &ifeoplist); | |
209 | write_unlock(&ife_mod_lock); | |
210 | return 0; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
213 | ||
214 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
215 | { | |
216 | struct tcf_meta_ops *m; | |
217 | int err = -ENOENT; | |
218 | ||
219 | write_lock(&ife_mod_lock); | |
220 | list_for_each_entry(m, &ifeoplist, list) { | |
221 | if (m->metaid == mops->metaid) { | |
222 | list_del(&mops->list); | |
223 | err = 0; | |
224 | break; | |
225 | } | |
226 | } | |
227 | write_unlock(&ife_mod_lock); | |
228 | ||
229 | return err; | |
230 | } | |
231 | EXPORT_SYMBOL_GPL(register_ife_op); | |
232 | ||
233 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
234 | { | |
235 | int ret = 0; | |
236 | /* XXX: unfortunately cant use nla_policy at this point | |
237 | * because a length of 0 is valid in the case of | |
238 | * "allow". "use" semantics do enforce for proper | |
239 | * length and i couldve use nla_policy but it makes it hard | |
240 | * to use it just for that.. | |
241 | */ | |
242 | if (ops->validate) | |
243 | return ops->validate(val, len); | |
244 | ||
245 | if (ops->metatype == NLA_U32) | |
246 | ret = ife_validate_meta_u32(val, len); | |
247 | else if (ops->metatype == NLA_U16) | |
248 | ret = ife_validate_meta_u16(val, len); | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | /* called when adding new meta information | |
067a7cd0 | 254 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
255 | */ |
256 | static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, | |
067a7cd0 | 257 | void *val, int len, bool exists) |
ef6980b6 JHS |
258 | { |
259 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
260 | int ret = 0; | |
261 | ||
262 | if (!ops) { | |
263 | ret = -ENOENT; | |
264 | #ifdef CONFIG_MODULES | |
067a7cd0 WC |
265 | if (exists) |
266 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
267 | rtnl_unlock(); |
268 | request_module("ifemeta%u", metaid); | |
269 | rtnl_lock(); | |
067a7cd0 WC |
270 | if (exists) |
271 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
272 | ops = find_ife_oplist(metaid); |
273 | #endif | |
274 | } | |
275 | ||
276 | if (ops) { | |
277 | ret = 0; | |
278 | if (len) | |
279 | ret = ife_validate_metatype(ops, val, len); | |
280 | ||
281 | module_put(ops->owner); | |
282 | } | |
283 | ||
284 | return ret; | |
285 | } | |
286 | ||
287 | /* called when adding new meta information | |
067a7cd0 | 288 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
289 | */ |
290 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
817e9f2c | 291 | int len, bool atomic) |
ef6980b6 JHS |
292 | { |
293 | struct tcf_meta_info *mi = NULL; | |
294 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
295 | int ret = 0; | |
296 | ||
297 | if (!ops) | |
298 | return -ENOENT; | |
299 | ||
817e9f2c | 300 | mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
301 | if (!mi) { |
302 | /*put back what find_ife_oplist took */ | |
303 | module_put(ops->owner); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | mi->metaid = metaid; | |
308 | mi->ops = ops; | |
309 | if (len > 0) { | |
817e9f2c | 310 | ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
311 | if (ret != 0) { |
312 | kfree(mi); | |
313 | module_put(ops->owner); | |
314 | return ret; | |
315 | } | |
316 | } | |
317 | ||
318 | list_add_tail(&mi->metalist, &ife->metalist); | |
319 | ||
320 | return ret; | |
321 | } | |
322 | ||
323 | static int use_all_metadata(struct tcf_ife_info *ife) | |
324 | { | |
325 | struct tcf_meta_ops *o; | |
326 | int rc = 0; | |
327 | int installed = 0; | |
328 | ||
817e9f2c | 329 | read_lock(&ife_mod_lock); |
ef6980b6 | 330 | list_for_each_entry(o, &ifeoplist, list) { |
817e9f2c | 331 | rc = add_metainfo(ife, o->metaid, NULL, 0, true); |
ef6980b6 JHS |
332 | if (rc == 0) |
333 | installed += 1; | |
334 | } | |
817e9f2c | 335 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
336 | |
337 | if (installed) | |
338 | return 0; | |
339 | else | |
340 | return -EINVAL; | |
341 | } | |
342 | ||
343 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
344 | { | |
345 | struct tcf_meta_info *e; | |
346 | struct nlattr *nest; | |
347 | unsigned char *b = skb_tail_pointer(skb); | |
348 | int total_encoded = 0; | |
349 | ||
350 | /*can only happen on decode */ | |
351 | if (list_empty(&ife->metalist)) | |
352 | return 0; | |
353 | ||
354 | nest = nla_nest_start(skb, TCA_IFE_METALST); | |
355 | if (!nest) | |
356 | goto out_nlmsg_trim; | |
357 | ||
358 | list_for_each_entry(e, &ife->metalist, metalist) { | |
359 | if (!e->ops->get(skb, e)) | |
360 | total_encoded += 1; | |
361 | } | |
362 | ||
363 | if (!total_encoded) | |
364 | goto out_nlmsg_trim; | |
365 | ||
366 | nla_nest_end(skb, nest); | |
367 | ||
368 | return 0; | |
369 | ||
370 | out_nlmsg_trim: | |
371 | nlmsg_trim(skb, b); | |
372 | return -1; | |
373 | } | |
374 | ||
375 | /* under ife->tcf_lock */ | |
376 | static void _tcf_ife_cleanup(struct tc_action *a, int bind) | |
377 | { | |
a85a970a | 378 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
379 | struct tcf_meta_info *e, *n; |
380 | ||
381 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
382 | module_put(e->ops->owner); | |
383 | list_del(&e->metalist); | |
384 | if (e->metaval) { | |
385 | if (e->ops->release) | |
386 | e->ops->release(e); | |
387 | else | |
388 | kfree(e->metaval); | |
389 | } | |
390 | kfree(e); | |
391 | } | |
392 | } | |
393 | ||
394 | static void tcf_ife_cleanup(struct tc_action *a, int bind) | |
395 | { | |
a85a970a | 396 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
397 | |
398 | spin_lock_bh(&ife->tcf_lock); | |
399 | _tcf_ife_cleanup(a, bind); | |
400 | spin_unlock_bh(&ife->tcf_lock); | |
401 | } | |
402 | ||
067a7cd0 WC |
403 | /* under ife->tcf_lock for existing action */ |
404 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, | |
405 | bool exists) | |
ef6980b6 JHS |
406 | { |
407 | int len = 0; | |
408 | int rc = 0; | |
409 | int i = 0; | |
410 | void *val; | |
411 | ||
412 | for (i = 1; i < max_metacnt; i++) { | |
413 | if (tb[i]) { | |
414 | val = nla_data(tb[i]); | |
415 | len = nla_len(tb[i]); | |
416 | ||
067a7cd0 | 417 | rc = load_metaops_and_vet(ife, i, val, len, exists); |
ef6980b6 JHS |
418 | if (rc != 0) |
419 | return rc; | |
420 | ||
067a7cd0 | 421 | rc = add_metainfo(ife, i, val, len, exists); |
ef6980b6 JHS |
422 | if (rc) |
423 | return rc; | |
424 | } | |
425 | } | |
426 | ||
427 | return rc; | |
428 | } | |
429 | ||
430 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
a85a970a | 431 | struct nlattr *est, struct tc_action **a, |
ef6980b6 JHS |
432 | int ovr, int bind) |
433 | { | |
434 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
435 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
436 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
437 | struct tcf_ife_info *ife; | |
438 | struct tc_ife *parm; | |
439 | u16 ife_type = 0; | |
440 | u8 *daddr = NULL; | |
441 | u8 *saddr = NULL; | |
b2313077 WC |
442 | bool exists = false; |
443 | int ret = 0; | |
ef6980b6 JHS |
444 | int err; |
445 | ||
fceb6435 | 446 | err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL); |
ef6980b6 JHS |
447 | if (err < 0) |
448 | return err; | |
449 | ||
450 | if (!tb[TCA_IFE_PARMS]) | |
451 | return -EINVAL; | |
452 | ||
453 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
454 | ||
4e8c8615 JHS |
455 | exists = tcf_hash_check(tn, parm->index, a, bind); |
456 | if (exists && bind) | |
457 | return 0; | |
458 | ||
ef6980b6 JHS |
459 | if (parm->flags & IFE_ENCODE) { |
460 | /* Until we get issued the ethertype, we cant have | |
461 | * a default.. | |
462 | **/ | |
463 | if (!tb[TCA_IFE_TYPE]) { | |
4e8c8615 | 464 | if (exists) |
a85a970a | 465 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
466 | pr_info("You MUST pass etherype for encoding\n"); |
467 | return -EINVAL; | |
468 | } | |
469 | } | |
470 | ||
4e8c8615 | 471 | if (!exists) { |
a85a970a | 472 | ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops, |
ef6980b6 JHS |
473 | bind, false); |
474 | if (ret) | |
475 | return ret; | |
476 | ret = ACT_P_CREATED; | |
477 | } else { | |
a85a970a | 478 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
479 | if (!ovr) |
480 | return -EEXIST; | |
481 | } | |
482 | ||
a85a970a | 483 | ife = to_ife(*a); |
ef6980b6 JHS |
484 | ife->flags = parm->flags; |
485 | ||
486 | if (parm->flags & IFE_ENCODE) { | |
487 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
488 | if (tb[TCA_IFE_DMAC]) | |
489 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
490 | if (tb[TCA_IFE_SMAC]) | |
491 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
492 | } | |
493 | ||
067a7cd0 WC |
494 | if (exists) |
495 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
496 | ife->tcf_action = parm->action; |
497 | ||
498 | if (parm->flags & IFE_ENCODE) { | |
499 | if (daddr) | |
500 | ether_addr_copy(ife->eth_dst, daddr); | |
501 | else | |
502 | eth_zero_addr(ife->eth_dst); | |
503 | ||
504 | if (saddr) | |
505 | ether_addr_copy(ife->eth_src, saddr); | |
506 | else | |
507 | eth_zero_addr(ife->eth_src); | |
508 | ||
509 | ife->eth_type = ife_type; | |
510 | } | |
511 | ||
512 | if (ret == ACT_P_CREATED) | |
513 | INIT_LIST_HEAD(&ife->metalist); | |
514 | ||
515 | if (tb[TCA_IFE_METALST]) { | |
516 | err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], | |
fceb6435 | 517 | NULL, NULL); |
ef6980b6 JHS |
518 | if (err) { |
519 | metadata_parse_err: | |
4e8c8615 | 520 | if (exists) |
a85a970a | 521 | tcf_hash_release(*a, bind); |
ef6980b6 | 522 | if (ret == ACT_P_CREATED) |
a85a970a | 523 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 524 | |
067a7cd0 WC |
525 | if (exists) |
526 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
527 | return err; |
528 | } | |
529 | ||
067a7cd0 | 530 | err = populate_metalist(ife, tb2, exists); |
ef6980b6 JHS |
531 | if (err) |
532 | goto metadata_parse_err; | |
533 | ||
534 | } else { | |
535 | /* if no passed metadata allow list or passed allow-all | |
536 | * then here we process by adding as many supported metadatum | |
537 | * as we can. You better have at least one else we are | |
538 | * going to bail out | |
539 | */ | |
540 | err = use_all_metadata(ife); | |
541 | if (err) { | |
542 | if (ret == ACT_P_CREATED) | |
a85a970a | 543 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 544 | |
067a7cd0 WC |
545 | if (exists) |
546 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
547 | return err; |
548 | } | |
549 | } | |
550 | ||
067a7cd0 WC |
551 | if (exists) |
552 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
553 | |
554 | if (ret == ACT_P_CREATED) | |
a85a970a | 555 | tcf_hash_insert(tn, *a); |
ef6980b6 JHS |
556 | |
557 | return ret; | |
558 | } | |
559 | ||
560 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
561 | int ref) | |
562 | { | |
563 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 564 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
565 | struct tc_ife opt = { |
566 | .index = ife->tcf_index, | |
567 | .refcnt = ife->tcf_refcnt - ref, | |
568 | .bindcnt = ife->tcf_bindcnt - bind, | |
569 | .action = ife->tcf_action, | |
570 | .flags = ife->flags, | |
571 | }; | |
572 | struct tcf_t t; | |
573 | ||
574 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) | |
575 | goto nla_put_failure; | |
576 | ||
48d8ee16 | 577 | tcf_tm_dump(&t, &ife->tcf_tm); |
9854518e | 578 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
579 | goto nla_put_failure; |
580 | ||
581 | if (!is_zero_ether_addr(ife->eth_dst)) { | |
582 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) | |
583 | goto nla_put_failure; | |
584 | } | |
585 | ||
586 | if (!is_zero_ether_addr(ife->eth_src)) { | |
587 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) | |
588 | goto nla_put_failure; | |
589 | } | |
590 | ||
591 | if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) | |
592 | goto nla_put_failure; | |
593 | ||
594 | if (dump_metalist(skb, ife)) { | |
595 | /*ignore failure to dump metalist */ | |
596 | pr_info("Failed to dump metalist\n"); | |
597 | } | |
598 | ||
599 | return skb->len; | |
600 | ||
601 | nla_put_failure: | |
602 | nlmsg_trim(skb, b); | |
603 | return -1; | |
604 | } | |
605 | ||
4dba87b0 OG |
606 | static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, |
607 | u16 metaid, u16 mlen, void *mdata) | |
ef6980b6 JHS |
608 | { |
609 | struct tcf_meta_info *e; | |
610 | ||
611 | /* XXX: use hash to speed up */ | |
612 | list_for_each_entry(e, &ife->metalist, metalist) { | |
613 | if (metaid == e->metaid) { | |
614 | if (e->ops) { | |
615 | /* We check for decode presence already */ | |
616 | return e->ops->decode(skb, mdata, mlen); | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
ef6980b6 JHS |
624 | static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, |
625 | struct tcf_result *res) | |
626 | { | |
a85a970a | 627 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 | 628 | int action = ife->tcf_action; |
295a6e06 YG |
629 | u8 *ifehdr_end; |
630 | u8 *tlv_data; | |
631 | u16 metalen; | |
ef6980b6 JHS |
632 | |
633 | spin_lock(&ife->tcf_lock); | |
634 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 635 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
636 | spin_unlock(&ife->tcf_lock); |
637 | ||
295a6e06 YG |
638 | if (skb_at_tc_ingress(skb)) |
639 | skb_push(skb, skb->dev->hard_header_len); | |
640 | ||
641 | tlv_data = ife_decode(skb, &metalen); | |
642 | if (unlikely(!tlv_data)) { | |
ef6980b6 JHS |
643 | spin_lock(&ife->tcf_lock); |
644 | ife->tcf_qstats.drops++; | |
645 | spin_unlock(&ife->tcf_lock); | |
646 | return TC_ACT_SHOT; | |
647 | } | |
648 | ||
295a6e06 YG |
649 | ifehdr_end = tlv_data + metalen; |
650 | for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { | |
651 | u8 *curr_data; | |
652 | u16 mtype; | |
653 | u16 dlen; | |
ef6980b6 | 654 | |
295a6e06 | 655 | curr_data = ife_tlv_meta_decode(tlv_data, &mtype, &dlen, NULL); |
ef6980b6 | 656 | |
295a6e06 | 657 | if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { |
ef6980b6 JHS |
658 | /* abuse overlimits to count when we receive metadata |
659 | * but dont have an ops for it | |
660 | */ | |
295a6e06 YG |
661 | pr_info_ratelimited("Unknown metaid %d dlen %d\n", |
662 | mtype, dlen); | |
ef6980b6 JHS |
663 | ife->tcf_qstats.overlimits++; |
664 | } | |
295a6e06 | 665 | } |
ef6980b6 | 666 | |
295a6e06 YG |
667 | if (WARN_ON(tlv_data != ifehdr_end)) { |
668 | spin_lock(&ife->tcf_lock); | |
669 | ife->tcf_qstats.drops++; | |
670 | spin_unlock(&ife->tcf_lock); | |
671 | return TC_ACT_SHOT; | |
ef6980b6 JHS |
672 | } |
673 | ||
295a6e06 | 674 | skb->protocol = eth_type_trans(skb, skb->dev); |
ef6980b6 | 675 | skb_reset_network_header(skb); |
295a6e06 | 676 | |
ef6980b6 JHS |
677 | return action; |
678 | } | |
679 | ||
680 | /*XXX: check if we can do this at install time instead of current | |
681 | * send data path | |
682 | **/ | |
683 | static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) | |
684 | { | |
685 | struct tcf_meta_info *e, *n; | |
686 | int tot_run_sz = 0, run_sz = 0; | |
687 | ||
688 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
689 | if (e->ops->check_presence) { | |
690 | run_sz = e->ops->check_presence(skb, e); | |
691 | tot_run_sz += run_sz; | |
692 | } | |
693 | } | |
694 | ||
695 | return tot_run_sz; | |
696 | } | |
697 | ||
698 | static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, | |
699 | struct tcf_result *res) | |
700 | { | |
a85a970a | 701 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
702 | int action = ife->tcf_action; |
703 | struct ethhdr *oethh; /* outer ether header */ | |
ef6980b6 JHS |
704 | struct tcf_meta_info *e; |
705 | /* | |
706 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
707 | where ORIGDATA = original ethernet header ... | |
708 | */ | |
709 | u16 metalen = ife_get_sz(skb, ife); | |
710 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
295a6e06 | 711 | unsigned int skboff = 0; |
ef6980b6 JHS |
712 | int new_len = skb->len + hdrm; |
713 | bool exceed_mtu = false; | |
295a6e06 YG |
714 | void *ife_meta; |
715 | int err = 0; | |
ef6980b6 | 716 | |
a5135bcf | 717 | if (!skb_at_tc_ingress(skb)) { |
ef6980b6 JHS |
718 | if (new_len > skb->dev->mtu) |
719 | exceed_mtu = true; | |
720 | } | |
721 | ||
722 | spin_lock(&ife->tcf_lock); | |
723 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 724 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
725 | |
726 | if (!metalen) { /* no metadata to send */ | |
727 | /* abuse overlimits to count when we allow packet | |
728 | * with no metadata | |
729 | */ | |
730 | ife->tcf_qstats.overlimits++; | |
731 | spin_unlock(&ife->tcf_lock); | |
732 | return action; | |
733 | } | |
734 | /* could be stupid policy setup or mtu config | |
735 | * so lets be conservative.. */ | |
736 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
737 | ife->tcf_qstats.drops++; | |
738 | spin_unlock(&ife->tcf_lock); | |
739 | return TC_ACT_SHOT; | |
740 | } | |
741 | ||
a5135bcf | 742 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
743 | skb_push(skb, skb->dev->hard_header_len); |
744 | ||
295a6e06 | 745 | ife_meta = ife_encode(skb, metalen); |
ef6980b6 JHS |
746 | |
747 | /* XXX: we dont have a clever way of telling encode to | |
748 | * not repeat some of the computations that are done by | |
749 | * ops->presence_check... | |
750 | */ | |
751 | list_for_each_entry(e, &ife->metalist, metalist) { | |
752 | if (e->ops->encode) { | |
295a6e06 | 753 | err = e->ops->encode(skb, (void *)(ife_meta + skboff), |
ef6980b6 JHS |
754 | e); |
755 | } | |
756 | if (err < 0) { | |
757 | /* too corrupt to keep around if overwritten */ | |
758 | ife->tcf_qstats.drops++; | |
759 | spin_unlock(&ife->tcf_lock); | |
760 | return TC_ACT_SHOT; | |
761 | } | |
762 | skboff += err; | |
763 | } | |
295a6e06 | 764 | oethh = (struct ethhdr *)skb->data; |
ef6980b6 JHS |
765 | |
766 | if (!is_zero_ether_addr(ife->eth_src)) | |
767 | ether_addr_copy(oethh->h_source, ife->eth_src); | |
ef6980b6 JHS |
768 | if (!is_zero_ether_addr(ife->eth_dst)) |
769 | ether_addr_copy(oethh->h_dest, ife->eth_dst); | |
ef6980b6 JHS |
770 | oethh->h_proto = htons(ife->eth_type); |
771 | ||
a5135bcf | 772 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
773 | skb_pull(skb, skb->dev->hard_header_len); |
774 | ||
775 | spin_unlock(&ife->tcf_lock); | |
776 | ||
777 | return action; | |
778 | } | |
779 | ||
780 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
781 | struct tcf_result *res) | |
782 | { | |
a85a970a | 783 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
784 | |
785 | if (ife->flags & IFE_ENCODE) | |
786 | return tcf_ife_encode(skb, a, res); | |
787 | ||
788 | if (!(ife->flags & IFE_ENCODE)) | |
789 | return tcf_ife_decode(skb, a, res); | |
790 | ||
791 | pr_info_ratelimited("unknown failure(policy neither de/encode\n"); | |
792 | spin_lock(&ife->tcf_lock); | |
793 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 794 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
795 | ife->tcf_qstats.drops++; |
796 | spin_unlock(&ife->tcf_lock); | |
797 | ||
798 | return TC_ACT_SHOT; | |
799 | } | |
800 | ||
801 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
802 | struct netlink_callback *cb, int type, | |
a85a970a | 803 | const struct tc_action_ops *ops) |
ef6980b6 JHS |
804 | { |
805 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
806 | ||
a85a970a | 807 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ef6980b6 JHS |
808 | } |
809 | ||
a85a970a | 810 | static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) |
ef6980b6 JHS |
811 | { |
812 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
813 | ||
814 | return tcf_hash_search(tn, a, index); | |
815 | } | |
816 | ||
817 | static struct tc_action_ops act_ife_ops = { | |
818 | .kind = "ife", | |
819 | .type = TCA_ACT_IFE, | |
820 | .owner = THIS_MODULE, | |
821 | .act = tcf_ife_act, | |
822 | .dump = tcf_ife_dump, | |
823 | .cleanup = tcf_ife_cleanup, | |
824 | .init = tcf_ife_init, | |
825 | .walk = tcf_ife_walker, | |
826 | .lookup = tcf_ife_search, | |
a85a970a | 827 | .size = sizeof(struct tcf_ife_info), |
ef6980b6 JHS |
828 | }; |
829 | ||
830 | static __net_init int ife_init_net(struct net *net) | |
831 | { | |
832 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
833 | ||
834 | return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK); | |
835 | } | |
836 | ||
837 | static void __net_exit ife_exit_net(struct net *net) | |
838 | { | |
839 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
840 | ||
841 | tc_action_net_exit(tn); | |
842 | } | |
843 | ||
844 | static struct pernet_operations ife_net_ops = { | |
845 | .init = ife_init_net, | |
846 | .exit = ife_exit_net, | |
847 | .id = &ife_net_id, | |
848 | .size = sizeof(struct tc_action_net), | |
849 | }; | |
850 | ||
851 | static int __init ife_init_module(void) | |
852 | { | |
853 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
854 | } | |
855 | ||
856 | static void __exit ife_cleanup_module(void) | |
857 | { | |
858 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
859 | } | |
860 | ||
861 | module_init(ife_init_module); | |
862 | module_exit(ife_cleanup_module); | |
863 | ||
864 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
865 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
866 | MODULE_LICENSE("GPL"); |