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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; | |
a85a970a | 40 | static struct tc_action_ops act_ife_ops; |
ef6980b6 JHS |
41 | |
42 | static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = { | |
43 | [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)}, | |
44 | [TCA_IFE_DMAC] = { .len = ETH_ALEN}, | |
45 | [TCA_IFE_SMAC] = { .len = ETH_ALEN}, | |
46 | [TCA_IFE_TYPE] = { .type = NLA_U16}, | |
47 | }; | |
48 | ||
49 | /* Caller takes care of presenting data in network order | |
50 | */ | |
51 | int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval) | |
52 | { | |
53 | u32 *tlv = (u32 *)(skbdata); | |
54 | u16 totlen = nla_total_size(dlen); /*alignment + hdr */ | |
55 | char *dptr = (char *)tlv + NLA_HDRLEN; | |
28a10c42 | 56 | u32 htlv = attrtype << 16 | dlen; |
ef6980b6 JHS |
57 | |
58 | *tlv = htonl(htlv); | |
59 | memset(dptr, 0, totlen - NLA_HDRLEN); | |
60 | memcpy(dptr, dval, dlen); | |
61 | ||
62 | return totlen; | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(ife_tlv_meta_encode); | |
65 | ||
66 | int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) | |
67 | { | |
68 | if (mi->metaval) | |
69 | return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); | |
70 | else | |
71 | return nla_put(skb, mi->metaid, 0, NULL); | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(ife_get_meta_u32); | |
74 | ||
75 | int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) | |
76 | { | |
77 | if (metaval || mi->metaval) | |
78 | return 8; /* T+L+V == 2+2+4 */ | |
79 | ||
80 | return 0; | |
81 | } | |
82 | EXPORT_SYMBOL_GPL(ife_check_meta_u32); | |
83 | ||
84 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) | |
85 | { | |
86 | u32 edata = metaval; | |
87 | ||
88 | if (mi->metaval) | |
89 | edata = *(u32 *)mi->metaval; | |
90 | else if (metaval) | |
91 | edata = metaval; | |
92 | ||
93 | if (!edata) /* will not encode */ | |
94 | return 0; | |
95 | ||
96 | edata = htonl(edata); | |
97 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
100 | ||
101 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
102 | { | |
103 | if (mi->metaval) | |
104 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
105 | else | |
106 | return nla_put(skb, mi->metaid, 0, NULL); | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
109 | ||
067a7cd0 | 110 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 111 | { |
067a7cd0 | 112 | mi->metaval = kmemdup(metaval, sizeof(u32), gfp); |
ef6980b6 JHS |
113 | if (!mi->metaval) |
114 | return -ENOMEM; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
119 | ||
067a7cd0 | 120 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 121 | { |
067a7cd0 | 122 | mi->metaval = kmemdup(metaval, sizeof(u16), gfp); |
ef6980b6 JHS |
123 | if (!mi->metaval) |
124 | return -ENOMEM; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
129 | ||
130 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
131 | { | |
132 | kfree(mi->metaval); | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
135 | ||
136 | int ife_validate_meta_u32(void *val, int len) | |
137 | { | |
28a10c42 | 138 | if (len == sizeof(u32)) |
ef6980b6 JHS |
139 | return 0; |
140 | ||
141 | return -EINVAL; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
144 | ||
145 | int ife_validate_meta_u16(void *val, int len) | |
146 | { | |
28a10c42 JHS |
147 | /* length will not include padding */ |
148 | if (len == sizeof(u16)) | |
ef6980b6 JHS |
149 | return 0; |
150 | ||
151 | return -EINVAL; | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
154 | ||
155 | static LIST_HEAD(ifeoplist); | |
156 | static DEFINE_RWLOCK(ife_mod_lock); | |
157 | ||
158 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
159 | { | |
160 | struct tcf_meta_ops *o; | |
161 | ||
162 | read_lock(&ife_mod_lock); | |
163 | list_for_each_entry(o, &ifeoplist, list) { | |
164 | if (o->metaid == metaid) { | |
165 | if (!try_module_get(o->owner)) | |
166 | o = NULL; | |
167 | read_unlock(&ife_mod_lock); | |
168 | return o; | |
169 | } | |
170 | } | |
171 | read_unlock(&ife_mod_lock); | |
172 | ||
173 | return NULL; | |
174 | } | |
175 | ||
176 | int register_ife_op(struct tcf_meta_ops *mops) | |
177 | { | |
178 | struct tcf_meta_ops *m; | |
179 | ||
180 | if (!mops->metaid || !mops->metatype || !mops->name || | |
181 | !mops->check_presence || !mops->encode || !mops->decode || | |
182 | !mops->get || !mops->alloc) | |
183 | return -EINVAL; | |
184 | ||
185 | write_lock(&ife_mod_lock); | |
186 | ||
187 | list_for_each_entry(m, &ifeoplist, list) { | |
188 | if (m->metaid == mops->metaid || | |
189 | (strcmp(mops->name, m->name) == 0)) { | |
190 | write_unlock(&ife_mod_lock); | |
191 | return -EEXIST; | |
192 | } | |
193 | } | |
194 | ||
195 | if (!mops->release) | |
196 | mops->release = ife_release_meta_gen; | |
197 | ||
198 | list_add_tail(&mops->list, &ifeoplist); | |
199 | write_unlock(&ife_mod_lock); | |
200 | return 0; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
203 | ||
204 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
205 | { | |
206 | struct tcf_meta_ops *m; | |
207 | int err = -ENOENT; | |
208 | ||
209 | write_lock(&ife_mod_lock); | |
210 | list_for_each_entry(m, &ifeoplist, list) { | |
211 | if (m->metaid == mops->metaid) { | |
212 | list_del(&mops->list); | |
213 | err = 0; | |
214 | break; | |
215 | } | |
216 | } | |
217 | write_unlock(&ife_mod_lock); | |
218 | ||
219 | return err; | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(register_ife_op); | |
222 | ||
223 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
224 | { | |
225 | int ret = 0; | |
226 | /* XXX: unfortunately cant use nla_policy at this point | |
227 | * because a length of 0 is valid in the case of | |
228 | * "allow". "use" semantics do enforce for proper | |
229 | * length and i couldve use nla_policy but it makes it hard | |
230 | * to use it just for that.. | |
231 | */ | |
232 | if (ops->validate) | |
233 | return ops->validate(val, len); | |
234 | ||
235 | if (ops->metatype == NLA_U32) | |
236 | ret = ife_validate_meta_u32(val, len); | |
237 | else if (ops->metatype == NLA_U16) | |
238 | ret = ife_validate_meta_u16(val, len); | |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
243 | /* called when adding new meta information | |
067a7cd0 | 244 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
245 | */ |
246 | static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, | |
067a7cd0 | 247 | void *val, int len, bool exists) |
ef6980b6 JHS |
248 | { |
249 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
250 | int ret = 0; | |
251 | ||
252 | if (!ops) { | |
253 | ret = -ENOENT; | |
254 | #ifdef CONFIG_MODULES | |
067a7cd0 WC |
255 | if (exists) |
256 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
257 | rtnl_unlock(); |
258 | request_module("ifemeta%u", metaid); | |
259 | rtnl_lock(); | |
067a7cd0 WC |
260 | if (exists) |
261 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
262 | ops = find_ife_oplist(metaid); |
263 | #endif | |
264 | } | |
265 | ||
266 | if (ops) { | |
267 | ret = 0; | |
268 | if (len) | |
269 | ret = ife_validate_metatype(ops, val, len); | |
270 | ||
271 | module_put(ops->owner); | |
272 | } | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | /* called when adding new meta information | |
067a7cd0 | 278 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
279 | */ |
280 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
817e9f2c | 281 | int len, bool atomic) |
ef6980b6 JHS |
282 | { |
283 | struct tcf_meta_info *mi = NULL; | |
284 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
285 | int ret = 0; | |
286 | ||
287 | if (!ops) | |
288 | return -ENOENT; | |
289 | ||
817e9f2c | 290 | mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
291 | if (!mi) { |
292 | /*put back what find_ife_oplist took */ | |
293 | module_put(ops->owner); | |
294 | return -ENOMEM; | |
295 | } | |
296 | ||
297 | mi->metaid = metaid; | |
298 | mi->ops = ops; | |
299 | if (len > 0) { | |
817e9f2c | 300 | ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
301 | if (ret != 0) { |
302 | kfree(mi); | |
303 | module_put(ops->owner); | |
304 | return ret; | |
305 | } | |
306 | } | |
307 | ||
308 | list_add_tail(&mi->metalist, &ife->metalist); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | static int use_all_metadata(struct tcf_ife_info *ife) | |
314 | { | |
315 | struct tcf_meta_ops *o; | |
316 | int rc = 0; | |
317 | int installed = 0; | |
318 | ||
817e9f2c | 319 | read_lock(&ife_mod_lock); |
ef6980b6 | 320 | list_for_each_entry(o, &ifeoplist, list) { |
817e9f2c | 321 | rc = add_metainfo(ife, o->metaid, NULL, 0, true); |
ef6980b6 JHS |
322 | if (rc == 0) |
323 | installed += 1; | |
324 | } | |
817e9f2c | 325 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
326 | |
327 | if (installed) | |
328 | return 0; | |
329 | else | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
334 | { | |
335 | struct tcf_meta_info *e; | |
336 | struct nlattr *nest; | |
337 | unsigned char *b = skb_tail_pointer(skb); | |
338 | int total_encoded = 0; | |
339 | ||
340 | /*can only happen on decode */ | |
341 | if (list_empty(&ife->metalist)) | |
342 | return 0; | |
343 | ||
344 | nest = nla_nest_start(skb, TCA_IFE_METALST); | |
345 | if (!nest) | |
346 | goto out_nlmsg_trim; | |
347 | ||
348 | list_for_each_entry(e, &ife->metalist, metalist) { | |
349 | if (!e->ops->get(skb, e)) | |
350 | total_encoded += 1; | |
351 | } | |
352 | ||
353 | if (!total_encoded) | |
354 | goto out_nlmsg_trim; | |
355 | ||
356 | nla_nest_end(skb, nest); | |
357 | ||
358 | return 0; | |
359 | ||
360 | out_nlmsg_trim: | |
361 | nlmsg_trim(skb, b); | |
362 | return -1; | |
363 | } | |
364 | ||
365 | /* under ife->tcf_lock */ | |
366 | static void _tcf_ife_cleanup(struct tc_action *a, int bind) | |
367 | { | |
a85a970a | 368 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
369 | struct tcf_meta_info *e, *n; |
370 | ||
371 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
372 | module_put(e->ops->owner); | |
373 | list_del(&e->metalist); | |
374 | if (e->metaval) { | |
375 | if (e->ops->release) | |
376 | e->ops->release(e); | |
377 | else | |
378 | kfree(e->metaval); | |
379 | } | |
380 | kfree(e); | |
381 | } | |
382 | } | |
383 | ||
384 | static void tcf_ife_cleanup(struct tc_action *a, int bind) | |
385 | { | |
a85a970a | 386 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
387 | |
388 | spin_lock_bh(&ife->tcf_lock); | |
389 | _tcf_ife_cleanup(a, bind); | |
390 | spin_unlock_bh(&ife->tcf_lock); | |
391 | } | |
392 | ||
067a7cd0 WC |
393 | /* under ife->tcf_lock for existing action */ |
394 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, | |
395 | bool exists) | |
ef6980b6 JHS |
396 | { |
397 | int len = 0; | |
398 | int rc = 0; | |
399 | int i = 0; | |
400 | void *val; | |
401 | ||
402 | for (i = 1; i < max_metacnt; i++) { | |
403 | if (tb[i]) { | |
404 | val = nla_data(tb[i]); | |
405 | len = nla_len(tb[i]); | |
406 | ||
067a7cd0 | 407 | rc = load_metaops_and_vet(ife, i, val, len, exists); |
ef6980b6 JHS |
408 | if (rc != 0) |
409 | return rc; | |
410 | ||
067a7cd0 | 411 | rc = add_metainfo(ife, i, val, len, exists); |
ef6980b6 JHS |
412 | if (rc) |
413 | return rc; | |
414 | } | |
415 | } | |
416 | ||
417 | return rc; | |
418 | } | |
419 | ||
420 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
a85a970a | 421 | struct nlattr *est, struct tc_action **a, |
ef6980b6 JHS |
422 | int ovr, int bind) |
423 | { | |
424 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
425 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
426 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
427 | struct tcf_ife_info *ife; | |
428 | struct tc_ife *parm; | |
429 | u16 ife_type = 0; | |
430 | u8 *daddr = NULL; | |
431 | u8 *saddr = NULL; | |
b2313077 WC |
432 | bool exists = false; |
433 | int ret = 0; | |
ef6980b6 JHS |
434 | int err; |
435 | ||
436 | err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy); | |
437 | if (err < 0) | |
438 | return err; | |
439 | ||
440 | if (!tb[TCA_IFE_PARMS]) | |
441 | return -EINVAL; | |
442 | ||
443 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
444 | ||
4e8c8615 JHS |
445 | exists = tcf_hash_check(tn, parm->index, a, bind); |
446 | if (exists && bind) | |
447 | return 0; | |
448 | ||
ef6980b6 JHS |
449 | if (parm->flags & IFE_ENCODE) { |
450 | /* Until we get issued the ethertype, we cant have | |
451 | * a default.. | |
452 | **/ | |
453 | if (!tb[TCA_IFE_TYPE]) { | |
4e8c8615 | 454 | if (exists) |
a85a970a | 455 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
456 | pr_info("You MUST pass etherype for encoding\n"); |
457 | return -EINVAL; | |
458 | } | |
459 | } | |
460 | ||
4e8c8615 | 461 | if (!exists) { |
a85a970a | 462 | ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops, |
ef6980b6 JHS |
463 | bind, false); |
464 | if (ret) | |
465 | return ret; | |
466 | ret = ACT_P_CREATED; | |
467 | } else { | |
a85a970a | 468 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
469 | if (!ovr) |
470 | return -EEXIST; | |
471 | } | |
472 | ||
a85a970a | 473 | ife = to_ife(*a); |
ef6980b6 JHS |
474 | ife->flags = parm->flags; |
475 | ||
476 | if (parm->flags & IFE_ENCODE) { | |
477 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
478 | if (tb[TCA_IFE_DMAC]) | |
479 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
480 | if (tb[TCA_IFE_SMAC]) | |
481 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
482 | } | |
483 | ||
067a7cd0 WC |
484 | if (exists) |
485 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
486 | ife->tcf_action = parm->action; |
487 | ||
488 | if (parm->flags & IFE_ENCODE) { | |
489 | if (daddr) | |
490 | ether_addr_copy(ife->eth_dst, daddr); | |
491 | else | |
492 | eth_zero_addr(ife->eth_dst); | |
493 | ||
494 | if (saddr) | |
495 | ether_addr_copy(ife->eth_src, saddr); | |
496 | else | |
497 | eth_zero_addr(ife->eth_src); | |
498 | ||
499 | ife->eth_type = ife_type; | |
500 | } | |
501 | ||
502 | if (ret == ACT_P_CREATED) | |
503 | INIT_LIST_HEAD(&ife->metalist); | |
504 | ||
505 | if (tb[TCA_IFE_METALST]) { | |
506 | err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], | |
507 | NULL); | |
508 | if (err) { | |
509 | metadata_parse_err: | |
4e8c8615 | 510 | if (exists) |
a85a970a | 511 | tcf_hash_release(*a, bind); |
ef6980b6 | 512 | if (ret == ACT_P_CREATED) |
a85a970a | 513 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 514 | |
067a7cd0 WC |
515 | if (exists) |
516 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
517 | return err; |
518 | } | |
519 | ||
067a7cd0 | 520 | err = populate_metalist(ife, tb2, exists); |
ef6980b6 JHS |
521 | if (err) |
522 | goto metadata_parse_err; | |
523 | ||
524 | } else { | |
525 | /* if no passed metadata allow list or passed allow-all | |
526 | * then here we process by adding as many supported metadatum | |
527 | * as we can. You better have at least one else we are | |
528 | * going to bail out | |
529 | */ | |
530 | err = use_all_metadata(ife); | |
531 | if (err) { | |
532 | if (ret == ACT_P_CREATED) | |
a85a970a | 533 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 534 | |
067a7cd0 WC |
535 | if (exists) |
536 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
537 | return err; |
538 | } | |
539 | } | |
540 | ||
067a7cd0 WC |
541 | if (exists) |
542 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
543 | |
544 | if (ret == ACT_P_CREATED) | |
a85a970a | 545 | tcf_hash_insert(tn, *a); |
ef6980b6 JHS |
546 | |
547 | return ret; | |
548 | } | |
549 | ||
550 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
551 | int ref) | |
552 | { | |
553 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 554 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
555 | struct tc_ife opt = { |
556 | .index = ife->tcf_index, | |
557 | .refcnt = ife->tcf_refcnt - ref, | |
558 | .bindcnt = ife->tcf_bindcnt - bind, | |
559 | .action = ife->tcf_action, | |
560 | .flags = ife->flags, | |
561 | }; | |
562 | struct tcf_t t; | |
563 | ||
564 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) | |
565 | goto nla_put_failure; | |
566 | ||
48d8ee16 | 567 | tcf_tm_dump(&t, &ife->tcf_tm); |
9854518e | 568 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
569 | goto nla_put_failure; |
570 | ||
571 | if (!is_zero_ether_addr(ife->eth_dst)) { | |
572 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) | |
573 | goto nla_put_failure; | |
574 | } | |
575 | ||
576 | if (!is_zero_ether_addr(ife->eth_src)) { | |
577 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) | |
578 | goto nla_put_failure; | |
579 | } | |
580 | ||
581 | if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) | |
582 | goto nla_put_failure; | |
583 | ||
584 | if (dump_metalist(skb, ife)) { | |
585 | /*ignore failure to dump metalist */ | |
586 | pr_info("Failed to dump metalist\n"); | |
587 | } | |
588 | ||
589 | return skb->len; | |
590 | ||
591 | nla_put_failure: | |
592 | nlmsg_trim(skb, b); | |
593 | return -1; | |
594 | } | |
595 | ||
596 | int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, | |
597 | u16 metaid, u16 mlen, void *mdata) | |
598 | { | |
599 | struct tcf_meta_info *e; | |
600 | ||
601 | /* XXX: use hash to speed up */ | |
602 | list_for_each_entry(e, &ife->metalist, metalist) { | |
603 | if (metaid == e->metaid) { | |
604 | if (e->ops) { | |
605 | /* We check for decode presence already */ | |
606 | return e->ops->decode(skb, mdata, mlen); | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | struct ifeheadr { | |
615 | __be16 metalen; | |
616 | u8 tlv_data[]; | |
617 | }; | |
618 | ||
619 | struct meta_tlvhdr { | |
620 | __be16 type; | |
621 | __be16 len; | |
622 | }; | |
623 | ||
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 JHS |
628 | int action = ife->tcf_action; |
629 | struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data; | |
630 | u16 ifehdrln = ifehdr->metalen; | |
631 | struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data); | |
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 | ||
638 | ifehdrln = ntohs(ifehdrln); | |
639 | if (unlikely(!pskb_may_pull(skb, ifehdrln))) { | |
640 | spin_lock(&ife->tcf_lock); | |
641 | ife->tcf_qstats.drops++; | |
642 | spin_unlock(&ife->tcf_lock); | |
643 | return TC_ACT_SHOT; | |
644 | } | |
645 | ||
646 | skb_set_mac_header(skb, ifehdrln); | |
647 | __skb_pull(skb, ifehdrln); | |
648 | skb->protocol = eth_type_trans(skb, skb->dev); | |
649 | ifehdrln -= IFE_METAHDRLEN; | |
650 | ||
651 | while (ifehdrln > 0) { | |
652 | u8 *tlvdata = (u8 *)tlv; | |
653 | u16 mtype = tlv->type; | |
654 | u16 mlen = tlv->len; | |
28a10c42 | 655 | u16 alen; |
ef6980b6 JHS |
656 | |
657 | mtype = ntohs(mtype); | |
658 | mlen = ntohs(mlen); | |
28a10c42 | 659 | alen = NLA_ALIGN(mlen); |
ef6980b6 | 660 | |
28a10c42 JHS |
661 | if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN), |
662 | (void *)(tlvdata + NLA_HDRLEN))) { | |
ef6980b6 JHS |
663 | /* abuse overlimits to count when we receive metadata |
664 | * but dont have an ops for it | |
665 | */ | |
666 | pr_info_ratelimited("Unknown metaid %d alnlen %d\n", | |
667 | mtype, mlen); | |
668 | ife->tcf_qstats.overlimits++; | |
669 | } | |
670 | ||
28a10c42 JHS |
671 | tlvdata += alen; |
672 | ifehdrln -= alen; | |
ef6980b6 JHS |
673 | tlv = (struct meta_tlvhdr *)tlvdata; |
674 | } | |
675 | ||
676 | skb_reset_network_header(skb); | |
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 */ | |
704 | struct ethhdr *iethh; /* inner eth header */ | |
705 | struct tcf_meta_info *e; | |
706 | /* | |
707 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
708 | where ORIGDATA = original ethernet header ... | |
709 | */ | |
710 | u16 metalen = ife_get_sz(skb, ife); | |
711 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
712 | unsigned int skboff = skb->dev->hard_header_len; | |
713 | u32 at = G_TC_AT(skb->tc_verd); | |
714 | int new_len = skb->len + hdrm; | |
715 | bool exceed_mtu = false; | |
716 | int err; | |
717 | ||
718 | if (at & AT_EGRESS) { | |
719 | if (new_len > skb->dev->mtu) | |
720 | exceed_mtu = true; | |
721 | } | |
722 | ||
723 | spin_lock(&ife->tcf_lock); | |
724 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 725 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
726 | |
727 | if (!metalen) { /* no metadata to send */ | |
728 | /* abuse overlimits to count when we allow packet | |
729 | * with no metadata | |
730 | */ | |
731 | ife->tcf_qstats.overlimits++; | |
732 | spin_unlock(&ife->tcf_lock); | |
733 | return action; | |
734 | } | |
735 | /* could be stupid policy setup or mtu config | |
736 | * so lets be conservative.. */ | |
737 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
738 | ife->tcf_qstats.drops++; | |
739 | spin_unlock(&ife->tcf_lock); | |
740 | return TC_ACT_SHOT; | |
741 | } | |
742 | ||
743 | iethh = eth_hdr(skb); | |
744 | ||
745 | err = skb_cow_head(skb, hdrm); | |
746 | if (unlikely(err)) { | |
747 | ife->tcf_qstats.drops++; | |
748 | spin_unlock(&ife->tcf_lock); | |
749 | return TC_ACT_SHOT; | |
750 | } | |
751 | ||
752 | if (!(at & AT_EGRESS)) | |
753 | skb_push(skb, skb->dev->hard_header_len); | |
754 | ||
755 | __skb_push(skb, hdrm); | |
756 | memcpy(skb->data, iethh, skb->mac_len); | |
757 | skb_reset_mac_header(skb); | |
758 | oethh = eth_hdr(skb); | |
759 | ||
760 | /*total metadata length */ | |
761 | metalen += IFE_METAHDRLEN; | |
762 | metalen = htons(metalen); | |
763 | memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN); | |
764 | skboff += IFE_METAHDRLEN; | |
765 | ||
766 | /* XXX: we dont have a clever way of telling encode to | |
767 | * not repeat some of the computations that are done by | |
768 | * ops->presence_check... | |
769 | */ | |
770 | list_for_each_entry(e, &ife->metalist, metalist) { | |
771 | if (e->ops->encode) { | |
772 | err = e->ops->encode(skb, (void *)(skb->data + skboff), | |
773 | e); | |
774 | } | |
775 | if (err < 0) { | |
776 | /* too corrupt to keep around if overwritten */ | |
777 | ife->tcf_qstats.drops++; | |
778 | spin_unlock(&ife->tcf_lock); | |
779 | return TC_ACT_SHOT; | |
780 | } | |
781 | skboff += err; | |
782 | } | |
783 | ||
784 | if (!is_zero_ether_addr(ife->eth_src)) | |
785 | ether_addr_copy(oethh->h_source, ife->eth_src); | |
786 | else | |
787 | ether_addr_copy(oethh->h_source, iethh->h_source); | |
788 | if (!is_zero_ether_addr(ife->eth_dst)) | |
789 | ether_addr_copy(oethh->h_dest, ife->eth_dst); | |
790 | else | |
791 | ether_addr_copy(oethh->h_dest, iethh->h_dest); | |
792 | oethh->h_proto = htons(ife->eth_type); | |
793 | ||
794 | if (!(at & AT_EGRESS)) | |
795 | skb_pull(skb, skb->dev->hard_header_len); | |
796 | ||
797 | spin_unlock(&ife->tcf_lock); | |
798 | ||
799 | return action; | |
800 | } | |
801 | ||
802 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
803 | struct tcf_result *res) | |
804 | { | |
a85a970a | 805 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
806 | |
807 | if (ife->flags & IFE_ENCODE) | |
808 | return tcf_ife_encode(skb, a, res); | |
809 | ||
810 | if (!(ife->flags & IFE_ENCODE)) | |
811 | return tcf_ife_decode(skb, a, res); | |
812 | ||
813 | pr_info_ratelimited("unknown failure(policy neither de/encode\n"); | |
814 | spin_lock(&ife->tcf_lock); | |
815 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 816 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
817 | ife->tcf_qstats.drops++; |
818 | spin_unlock(&ife->tcf_lock); | |
819 | ||
820 | return TC_ACT_SHOT; | |
821 | } | |
822 | ||
823 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
824 | struct netlink_callback *cb, int type, | |
a85a970a | 825 | const struct tc_action_ops *ops) |
ef6980b6 JHS |
826 | { |
827 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
828 | ||
a85a970a | 829 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ef6980b6 JHS |
830 | } |
831 | ||
a85a970a | 832 | static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) |
ef6980b6 JHS |
833 | { |
834 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
835 | ||
836 | return tcf_hash_search(tn, a, index); | |
837 | } | |
838 | ||
839 | static struct tc_action_ops act_ife_ops = { | |
840 | .kind = "ife", | |
841 | .type = TCA_ACT_IFE, | |
842 | .owner = THIS_MODULE, | |
843 | .act = tcf_ife_act, | |
844 | .dump = tcf_ife_dump, | |
845 | .cleanup = tcf_ife_cleanup, | |
846 | .init = tcf_ife_init, | |
847 | .walk = tcf_ife_walker, | |
848 | .lookup = tcf_ife_search, | |
a85a970a | 849 | .size = sizeof(struct tcf_ife_info), |
ef6980b6 JHS |
850 | }; |
851 | ||
852 | static __net_init int ife_init_net(struct net *net) | |
853 | { | |
854 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
855 | ||
856 | return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK); | |
857 | } | |
858 | ||
859 | static void __net_exit ife_exit_net(struct net *net) | |
860 | { | |
861 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
862 | ||
863 | tc_action_net_exit(tn); | |
864 | } | |
865 | ||
866 | static struct pernet_operations ife_net_ops = { | |
867 | .init = ife_init_net, | |
868 | .exit = ife_exit_net, | |
869 | .id = &ife_net_id, | |
870 | .size = sizeof(struct tc_action_net), | |
871 | }; | |
872 | ||
873 | static int __init ife_init_module(void) | |
874 | { | |
875 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
876 | } | |
877 | ||
878 | static void __exit ife_cleanup_module(void) | |
879 | { | |
880 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
881 | } | |
882 | ||
883 | module_init(ife_init_module); | |
884 | module_exit(ife_cleanup_module); | |
885 | ||
886 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
887 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
888 | MODULE_LICENSE("GPL"); |