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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; | |
c006da0b | 56 | u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN); |
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 | ||
6a5d58b6 JHS |
66 | int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi) |
67 | { | |
68 | u16 edata = 0; | |
69 | ||
70 | if (mi->metaval) | |
71 | edata = *(u16 *)mi->metaval; | |
72 | else if (metaval) | |
73 | edata = metaval; | |
74 | ||
75 | if (!edata) /* will not encode */ | |
76 | return 0; | |
77 | ||
78 | edata = htons(edata); | |
79 | return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata); | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(ife_encode_meta_u16); | |
82 | ||
ef6980b6 JHS |
83 | int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) |
84 | { | |
85 | if (mi->metaval) | |
86 | return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); | |
87 | else | |
88 | return nla_put(skb, mi->metaid, 0, NULL); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(ife_get_meta_u32); | |
91 | ||
92 | int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) | |
93 | { | |
94 | if (metaval || mi->metaval) | |
95 | return 8; /* T+L+V == 2+2+4 */ | |
96 | ||
97 | return 0; | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(ife_check_meta_u32); | |
100 | ||
6a5d58b6 JHS |
101 | int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi) |
102 | { | |
103 | if (metaval || mi->metaval) | |
104 | return 8; /* T+L+(V) == 2+2+(2+2bytepad) */ | |
105 | ||
106 | return 0; | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(ife_check_meta_u16); | |
109 | ||
ef6980b6 JHS |
110 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) |
111 | { | |
112 | u32 edata = metaval; | |
113 | ||
114 | if (mi->metaval) | |
115 | edata = *(u32 *)mi->metaval; | |
116 | else if (metaval) | |
117 | edata = metaval; | |
118 | ||
119 | if (!edata) /* will not encode */ | |
120 | return 0; | |
121 | ||
122 | edata = htonl(edata); | |
123 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
124 | } | |
125 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
126 | ||
127 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
128 | { | |
129 | if (mi->metaval) | |
130 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
131 | else | |
132 | return nla_put(skb, mi->metaid, 0, NULL); | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
135 | ||
067a7cd0 | 136 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 137 | { |
067a7cd0 | 138 | mi->metaval = kmemdup(metaval, sizeof(u32), gfp); |
ef6980b6 JHS |
139 | if (!mi->metaval) |
140 | return -ENOMEM; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
145 | ||
067a7cd0 | 146 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 147 | { |
067a7cd0 | 148 | mi->metaval = kmemdup(metaval, sizeof(u16), gfp); |
ef6980b6 JHS |
149 | if (!mi->metaval) |
150 | return -ENOMEM; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
155 | ||
156 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
157 | { | |
158 | kfree(mi->metaval); | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
161 | ||
162 | int ife_validate_meta_u32(void *val, int len) | |
163 | { | |
28a10c42 | 164 | if (len == sizeof(u32)) |
ef6980b6 JHS |
165 | return 0; |
166 | ||
167 | return -EINVAL; | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
170 | ||
171 | int ife_validate_meta_u16(void *val, int len) | |
172 | { | |
28a10c42 JHS |
173 | /* length will not include padding */ |
174 | if (len == sizeof(u16)) | |
ef6980b6 JHS |
175 | return 0; |
176 | ||
177 | return -EINVAL; | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
180 | ||
181 | static LIST_HEAD(ifeoplist); | |
182 | static DEFINE_RWLOCK(ife_mod_lock); | |
183 | ||
184 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
185 | { | |
186 | struct tcf_meta_ops *o; | |
187 | ||
188 | read_lock(&ife_mod_lock); | |
189 | list_for_each_entry(o, &ifeoplist, list) { | |
190 | if (o->metaid == metaid) { | |
191 | if (!try_module_get(o->owner)) | |
192 | o = NULL; | |
193 | read_unlock(&ife_mod_lock); | |
194 | return o; | |
195 | } | |
196 | } | |
197 | read_unlock(&ife_mod_lock); | |
198 | ||
199 | return NULL; | |
200 | } | |
201 | ||
202 | int register_ife_op(struct tcf_meta_ops *mops) | |
203 | { | |
204 | struct tcf_meta_ops *m; | |
205 | ||
206 | if (!mops->metaid || !mops->metatype || !mops->name || | |
207 | !mops->check_presence || !mops->encode || !mops->decode || | |
208 | !mops->get || !mops->alloc) | |
209 | return -EINVAL; | |
210 | ||
211 | write_lock(&ife_mod_lock); | |
212 | ||
213 | list_for_each_entry(m, &ifeoplist, list) { | |
214 | if (m->metaid == mops->metaid || | |
215 | (strcmp(mops->name, m->name) == 0)) { | |
216 | write_unlock(&ife_mod_lock); | |
217 | return -EEXIST; | |
218 | } | |
219 | } | |
220 | ||
221 | if (!mops->release) | |
222 | mops->release = ife_release_meta_gen; | |
223 | ||
224 | list_add_tail(&mops->list, &ifeoplist); | |
225 | write_unlock(&ife_mod_lock); | |
226 | return 0; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
229 | ||
230 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
231 | { | |
232 | struct tcf_meta_ops *m; | |
233 | int err = -ENOENT; | |
234 | ||
235 | write_lock(&ife_mod_lock); | |
236 | list_for_each_entry(m, &ifeoplist, list) { | |
237 | if (m->metaid == mops->metaid) { | |
238 | list_del(&mops->list); | |
239 | err = 0; | |
240 | break; | |
241 | } | |
242 | } | |
243 | write_unlock(&ife_mod_lock); | |
244 | ||
245 | return err; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(register_ife_op); | |
248 | ||
249 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
250 | { | |
251 | int ret = 0; | |
252 | /* XXX: unfortunately cant use nla_policy at this point | |
253 | * because a length of 0 is valid in the case of | |
254 | * "allow". "use" semantics do enforce for proper | |
255 | * length and i couldve use nla_policy but it makes it hard | |
256 | * to use it just for that.. | |
257 | */ | |
258 | if (ops->validate) | |
259 | return ops->validate(val, len); | |
260 | ||
261 | if (ops->metatype == NLA_U32) | |
262 | ret = ife_validate_meta_u32(val, len); | |
263 | else if (ops->metatype == NLA_U16) | |
264 | ret = ife_validate_meta_u16(val, len); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | /* called when adding new meta information | |
067a7cd0 | 270 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
271 | */ |
272 | static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid, | |
067a7cd0 | 273 | void *val, int len, bool exists) |
ef6980b6 JHS |
274 | { |
275 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
276 | int ret = 0; | |
277 | ||
278 | if (!ops) { | |
279 | ret = -ENOENT; | |
280 | #ifdef CONFIG_MODULES | |
067a7cd0 WC |
281 | if (exists) |
282 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
283 | rtnl_unlock(); |
284 | request_module("ifemeta%u", metaid); | |
285 | rtnl_lock(); | |
067a7cd0 WC |
286 | if (exists) |
287 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
288 | ops = find_ife_oplist(metaid); |
289 | #endif | |
290 | } | |
291 | ||
292 | if (ops) { | |
293 | ret = 0; | |
294 | if (len) | |
295 | ret = ife_validate_metatype(ops, val, len); | |
296 | ||
297 | module_put(ops->owner); | |
298 | } | |
299 | ||
300 | return ret; | |
301 | } | |
302 | ||
303 | /* called when adding new meta information | |
067a7cd0 | 304 | * under ife->tcf_lock for existing action |
ef6980b6 JHS |
305 | */ |
306 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
817e9f2c | 307 | int len, bool atomic) |
ef6980b6 JHS |
308 | { |
309 | struct tcf_meta_info *mi = NULL; | |
310 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
311 | int ret = 0; | |
312 | ||
313 | if (!ops) | |
314 | return -ENOENT; | |
315 | ||
817e9f2c | 316 | mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
317 | if (!mi) { |
318 | /*put back what find_ife_oplist took */ | |
319 | module_put(ops->owner); | |
320 | return -ENOMEM; | |
321 | } | |
322 | ||
323 | mi->metaid = metaid; | |
324 | mi->ops = ops; | |
325 | if (len > 0) { | |
817e9f2c | 326 | ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
327 | if (ret != 0) { |
328 | kfree(mi); | |
329 | module_put(ops->owner); | |
330 | return ret; | |
331 | } | |
332 | } | |
333 | ||
334 | list_add_tail(&mi->metalist, &ife->metalist); | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
339 | static int use_all_metadata(struct tcf_ife_info *ife) | |
340 | { | |
341 | struct tcf_meta_ops *o; | |
342 | int rc = 0; | |
343 | int installed = 0; | |
344 | ||
817e9f2c | 345 | read_lock(&ife_mod_lock); |
ef6980b6 | 346 | list_for_each_entry(o, &ifeoplist, list) { |
817e9f2c | 347 | rc = add_metainfo(ife, o->metaid, NULL, 0, true); |
ef6980b6 JHS |
348 | if (rc == 0) |
349 | installed += 1; | |
350 | } | |
817e9f2c | 351 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
352 | |
353 | if (installed) | |
354 | return 0; | |
355 | else | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
360 | { | |
361 | struct tcf_meta_info *e; | |
362 | struct nlattr *nest; | |
363 | unsigned char *b = skb_tail_pointer(skb); | |
364 | int total_encoded = 0; | |
365 | ||
366 | /*can only happen on decode */ | |
367 | if (list_empty(&ife->metalist)) | |
368 | return 0; | |
369 | ||
370 | nest = nla_nest_start(skb, TCA_IFE_METALST); | |
371 | if (!nest) | |
372 | goto out_nlmsg_trim; | |
373 | ||
374 | list_for_each_entry(e, &ife->metalist, metalist) { | |
375 | if (!e->ops->get(skb, e)) | |
376 | total_encoded += 1; | |
377 | } | |
378 | ||
379 | if (!total_encoded) | |
380 | goto out_nlmsg_trim; | |
381 | ||
382 | nla_nest_end(skb, nest); | |
383 | ||
384 | return 0; | |
385 | ||
386 | out_nlmsg_trim: | |
387 | nlmsg_trim(skb, b); | |
388 | return -1; | |
389 | } | |
390 | ||
391 | /* under ife->tcf_lock */ | |
392 | static void _tcf_ife_cleanup(struct tc_action *a, int bind) | |
393 | { | |
a85a970a | 394 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
395 | struct tcf_meta_info *e, *n; |
396 | ||
397 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
398 | module_put(e->ops->owner); | |
399 | list_del(&e->metalist); | |
400 | if (e->metaval) { | |
401 | if (e->ops->release) | |
402 | e->ops->release(e); | |
403 | else | |
404 | kfree(e->metaval); | |
405 | } | |
406 | kfree(e); | |
407 | } | |
408 | } | |
409 | ||
410 | static void tcf_ife_cleanup(struct tc_action *a, int bind) | |
411 | { | |
a85a970a | 412 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
413 | |
414 | spin_lock_bh(&ife->tcf_lock); | |
415 | _tcf_ife_cleanup(a, bind); | |
416 | spin_unlock_bh(&ife->tcf_lock); | |
417 | } | |
418 | ||
067a7cd0 WC |
419 | /* under ife->tcf_lock for existing action */ |
420 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, | |
421 | bool exists) | |
ef6980b6 JHS |
422 | { |
423 | int len = 0; | |
424 | int rc = 0; | |
425 | int i = 0; | |
426 | void *val; | |
427 | ||
428 | for (i = 1; i < max_metacnt; i++) { | |
429 | if (tb[i]) { | |
430 | val = nla_data(tb[i]); | |
431 | len = nla_len(tb[i]); | |
432 | ||
067a7cd0 | 433 | rc = load_metaops_and_vet(ife, i, val, len, exists); |
ef6980b6 JHS |
434 | if (rc != 0) |
435 | return rc; | |
436 | ||
067a7cd0 | 437 | rc = add_metainfo(ife, i, val, len, exists); |
ef6980b6 JHS |
438 | if (rc) |
439 | return rc; | |
440 | } | |
441 | } | |
442 | ||
443 | return rc; | |
444 | } | |
445 | ||
446 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
a85a970a | 447 | struct nlattr *est, struct tc_action **a, |
ef6980b6 JHS |
448 | int ovr, int bind) |
449 | { | |
450 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
451 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
452 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
453 | struct tcf_ife_info *ife; | |
454 | struct tc_ife *parm; | |
455 | u16 ife_type = 0; | |
456 | u8 *daddr = NULL; | |
457 | u8 *saddr = NULL; | |
b2313077 WC |
458 | bool exists = false; |
459 | int ret = 0; | |
ef6980b6 JHS |
460 | int err; |
461 | ||
462 | err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy); | |
463 | if (err < 0) | |
464 | return err; | |
465 | ||
466 | if (!tb[TCA_IFE_PARMS]) | |
467 | return -EINVAL; | |
468 | ||
469 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
470 | ||
4e8c8615 JHS |
471 | exists = tcf_hash_check(tn, parm->index, a, bind); |
472 | if (exists && bind) | |
473 | return 0; | |
474 | ||
ef6980b6 JHS |
475 | if (parm->flags & IFE_ENCODE) { |
476 | /* Until we get issued the ethertype, we cant have | |
477 | * a default.. | |
478 | **/ | |
479 | if (!tb[TCA_IFE_TYPE]) { | |
4e8c8615 | 480 | if (exists) |
a85a970a | 481 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
482 | pr_info("You MUST pass etherype for encoding\n"); |
483 | return -EINVAL; | |
484 | } | |
485 | } | |
486 | ||
4e8c8615 | 487 | if (!exists) { |
a85a970a | 488 | ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops, |
ef6980b6 JHS |
489 | bind, false); |
490 | if (ret) | |
491 | return ret; | |
492 | ret = ACT_P_CREATED; | |
493 | } else { | |
a85a970a | 494 | tcf_hash_release(*a, bind); |
ef6980b6 JHS |
495 | if (!ovr) |
496 | return -EEXIST; | |
497 | } | |
498 | ||
a85a970a | 499 | ife = to_ife(*a); |
ef6980b6 JHS |
500 | ife->flags = parm->flags; |
501 | ||
502 | if (parm->flags & IFE_ENCODE) { | |
503 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
504 | if (tb[TCA_IFE_DMAC]) | |
505 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
506 | if (tb[TCA_IFE_SMAC]) | |
507 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
508 | } | |
509 | ||
067a7cd0 WC |
510 | if (exists) |
511 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
512 | ife->tcf_action = parm->action; |
513 | ||
514 | if (parm->flags & IFE_ENCODE) { | |
515 | if (daddr) | |
516 | ether_addr_copy(ife->eth_dst, daddr); | |
517 | else | |
518 | eth_zero_addr(ife->eth_dst); | |
519 | ||
520 | if (saddr) | |
521 | ether_addr_copy(ife->eth_src, saddr); | |
522 | else | |
523 | eth_zero_addr(ife->eth_src); | |
524 | ||
525 | ife->eth_type = ife_type; | |
526 | } | |
527 | ||
528 | if (ret == ACT_P_CREATED) | |
529 | INIT_LIST_HEAD(&ife->metalist); | |
530 | ||
531 | if (tb[TCA_IFE_METALST]) { | |
532 | err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], | |
533 | NULL); | |
534 | if (err) { | |
535 | metadata_parse_err: | |
4e8c8615 | 536 | if (exists) |
a85a970a | 537 | tcf_hash_release(*a, bind); |
ef6980b6 | 538 | if (ret == ACT_P_CREATED) |
a85a970a | 539 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 540 | |
067a7cd0 WC |
541 | if (exists) |
542 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
543 | return err; |
544 | } | |
545 | ||
067a7cd0 | 546 | err = populate_metalist(ife, tb2, exists); |
ef6980b6 JHS |
547 | if (err) |
548 | goto metadata_parse_err; | |
549 | ||
550 | } else { | |
551 | /* if no passed metadata allow list or passed allow-all | |
552 | * then here we process by adding as many supported metadatum | |
553 | * as we can. You better have at least one else we are | |
554 | * going to bail out | |
555 | */ | |
556 | err = use_all_metadata(ife); | |
557 | if (err) { | |
558 | if (ret == ACT_P_CREATED) | |
a85a970a | 559 | _tcf_ife_cleanup(*a, bind); |
ef6980b6 | 560 | |
067a7cd0 WC |
561 | if (exists) |
562 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
563 | return err; |
564 | } | |
565 | } | |
566 | ||
067a7cd0 WC |
567 | if (exists) |
568 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
569 | |
570 | if (ret == ACT_P_CREATED) | |
a85a970a | 571 | tcf_hash_insert(tn, *a); |
ef6980b6 JHS |
572 | |
573 | return ret; | |
574 | } | |
575 | ||
576 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
577 | int ref) | |
578 | { | |
579 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 580 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
581 | struct tc_ife opt = { |
582 | .index = ife->tcf_index, | |
583 | .refcnt = ife->tcf_refcnt - ref, | |
584 | .bindcnt = ife->tcf_bindcnt - bind, | |
585 | .action = ife->tcf_action, | |
586 | .flags = ife->flags, | |
587 | }; | |
588 | struct tcf_t t; | |
589 | ||
590 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) | |
591 | goto nla_put_failure; | |
592 | ||
48d8ee16 | 593 | tcf_tm_dump(&t, &ife->tcf_tm); |
9854518e | 594 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
595 | goto nla_put_failure; |
596 | ||
597 | if (!is_zero_ether_addr(ife->eth_dst)) { | |
598 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst)) | |
599 | goto nla_put_failure; | |
600 | } | |
601 | ||
602 | if (!is_zero_ether_addr(ife->eth_src)) { | |
603 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src)) | |
604 | goto nla_put_failure; | |
605 | } | |
606 | ||
607 | if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type)) | |
608 | goto nla_put_failure; | |
609 | ||
610 | if (dump_metalist(skb, ife)) { | |
611 | /*ignore failure to dump metalist */ | |
612 | pr_info("Failed to dump metalist\n"); | |
613 | } | |
614 | ||
615 | return skb->len; | |
616 | ||
617 | nla_put_failure: | |
618 | nlmsg_trim(skb, b); | |
619 | return -1; | |
620 | } | |
621 | ||
622 | int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, | |
623 | u16 metaid, u16 mlen, void *mdata) | |
624 | { | |
625 | struct tcf_meta_info *e; | |
626 | ||
627 | /* XXX: use hash to speed up */ | |
628 | list_for_each_entry(e, &ife->metalist, metalist) { | |
629 | if (metaid == e->metaid) { | |
630 | if (e->ops) { | |
631 | /* We check for decode presence already */ | |
632 | return e->ops->decode(skb, mdata, mlen); | |
633 | } | |
634 | } | |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | struct ifeheadr { | |
641 | __be16 metalen; | |
642 | u8 tlv_data[]; | |
643 | }; | |
644 | ||
645 | struct meta_tlvhdr { | |
646 | __be16 type; | |
647 | __be16 len; | |
648 | }; | |
649 | ||
650 | static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, | |
651 | struct tcf_result *res) | |
652 | { | |
a85a970a | 653 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
654 | int action = ife->tcf_action; |
655 | struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data; | |
c006da0b | 656 | int ifehdrln = (int)ifehdr->metalen; |
ef6980b6 JHS |
657 | struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data); |
658 | ||
659 | spin_lock(&ife->tcf_lock); | |
660 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 661 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
662 | spin_unlock(&ife->tcf_lock); |
663 | ||
664 | ifehdrln = ntohs(ifehdrln); | |
665 | if (unlikely(!pskb_may_pull(skb, ifehdrln))) { | |
666 | spin_lock(&ife->tcf_lock); | |
667 | ife->tcf_qstats.drops++; | |
668 | spin_unlock(&ife->tcf_lock); | |
669 | return TC_ACT_SHOT; | |
670 | } | |
671 | ||
672 | skb_set_mac_header(skb, ifehdrln); | |
673 | __skb_pull(skb, ifehdrln); | |
674 | skb->protocol = eth_type_trans(skb, skb->dev); | |
675 | ifehdrln -= IFE_METAHDRLEN; | |
676 | ||
677 | while (ifehdrln > 0) { | |
678 | u8 *tlvdata = (u8 *)tlv; | |
679 | u16 mtype = tlv->type; | |
680 | u16 mlen = tlv->len; | |
28a10c42 | 681 | u16 alen; |
ef6980b6 JHS |
682 | |
683 | mtype = ntohs(mtype); | |
684 | mlen = ntohs(mlen); | |
28a10c42 | 685 | alen = NLA_ALIGN(mlen); |
ef6980b6 | 686 | |
28a10c42 JHS |
687 | if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN), |
688 | (void *)(tlvdata + NLA_HDRLEN))) { | |
ef6980b6 JHS |
689 | /* abuse overlimits to count when we receive metadata |
690 | * but dont have an ops for it | |
691 | */ | |
692 | pr_info_ratelimited("Unknown metaid %d alnlen %d\n", | |
693 | mtype, mlen); | |
694 | ife->tcf_qstats.overlimits++; | |
695 | } | |
696 | ||
28a10c42 JHS |
697 | tlvdata += alen; |
698 | ifehdrln -= alen; | |
ef6980b6 JHS |
699 | tlv = (struct meta_tlvhdr *)tlvdata; |
700 | } | |
701 | ||
702 | skb_reset_network_header(skb); | |
703 | return action; | |
704 | } | |
705 | ||
706 | /*XXX: check if we can do this at install time instead of current | |
707 | * send data path | |
708 | **/ | |
709 | static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) | |
710 | { | |
711 | struct tcf_meta_info *e, *n; | |
712 | int tot_run_sz = 0, run_sz = 0; | |
713 | ||
714 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
715 | if (e->ops->check_presence) { | |
716 | run_sz = e->ops->check_presence(skb, e); | |
717 | tot_run_sz += run_sz; | |
718 | } | |
719 | } | |
720 | ||
721 | return tot_run_sz; | |
722 | } | |
723 | ||
724 | static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, | |
725 | struct tcf_result *res) | |
726 | { | |
a85a970a | 727 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
728 | int action = ife->tcf_action; |
729 | struct ethhdr *oethh; /* outer ether header */ | |
730 | struct ethhdr *iethh; /* inner eth header */ | |
731 | struct tcf_meta_info *e; | |
732 | /* | |
733 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
734 | where ORIGDATA = original ethernet header ... | |
735 | */ | |
736 | u16 metalen = ife_get_sz(skb, ife); | |
737 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
738 | unsigned int skboff = skb->dev->hard_header_len; | |
739 | u32 at = G_TC_AT(skb->tc_verd); | |
740 | int new_len = skb->len + hdrm; | |
741 | bool exceed_mtu = false; | |
742 | int err; | |
743 | ||
744 | if (at & AT_EGRESS) { | |
745 | if (new_len > skb->dev->mtu) | |
746 | exceed_mtu = true; | |
747 | } | |
748 | ||
749 | spin_lock(&ife->tcf_lock); | |
750 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 751 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
752 | |
753 | if (!metalen) { /* no metadata to send */ | |
754 | /* abuse overlimits to count when we allow packet | |
755 | * with no metadata | |
756 | */ | |
757 | ife->tcf_qstats.overlimits++; | |
758 | spin_unlock(&ife->tcf_lock); | |
759 | return action; | |
760 | } | |
761 | /* could be stupid policy setup or mtu config | |
762 | * so lets be conservative.. */ | |
763 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
764 | ife->tcf_qstats.drops++; | |
765 | spin_unlock(&ife->tcf_lock); | |
766 | return TC_ACT_SHOT; | |
767 | } | |
768 | ||
ef6980b6 JHS |
769 | err = skb_cow_head(skb, hdrm); |
770 | if (unlikely(err)) { | |
771 | ife->tcf_qstats.drops++; | |
772 | spin_unlock(&ife->tcf_lock); | |
773 | return TC_ACT_SHOT; | |
774 | } | |
775 | ||
776 | if (!(at & AT_EGRESS)) | |
777 | skb_push(skb, skb->dev->hard_header_len); | |
778 | ||
4b1d488a | 779 | iethh = (struct ethhdr *)skb->data; |
ef6980b6 JHS |
780 | __skb_push(skb, hdrm); |
781 | memcpy(skb->data, iethh, skb->mac_len); | |
782 | skb_reset_mac_header(skb); | |
783 | oethh = eth_hdr(skb); | |
784 | ||
785 | /*total metadata length */ | |
786 | metalen += IFE_METAHDRLEN; | |
787 | metalen = htons(metalen); | |
788 | memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN); | |
789 | skboff += IFE_METAHDRLEN; | |
790 | ||
791 | /* XXX: we dont have a clever way of telling encode to | |
792 | * not repeat some of the computations that are done by | |
793 | * ops->presence_check... | |
794 | */ | |
795 | list_for_each_entry(e, &ife->metalist, metalist) { | |
796 | if (e->ops->encode) { | |
797 | err = e->ops->encode(skb, (void *)(skb->data + skboff), | |
798 | e); | |
799 | } | |
800 | if (err < 0) { | |
801 | /* too corrupt to keep around if overwritten */ | |
802 | ife->tcf_qstats.drops++; | |
803 | spin_unlock(&ife->tcf_lock); | |
804 | return TC_ACT_SHOT; | |
805 | } | |
806 | skboff += err; | |
807 | } | |
808 | ||
809 | if (!is_zero_ether_addr(ife->eth_src)) | |
810 | ether_addr_copy(oethh->h_source, ife->eth_src); | |
811 | else | |
812 | ether_addr_copy(oethh->h_source, iethh->h_source); | |
813 | if (!is_zero_ether_addr(ife->eth_dst)) | |
814 | ether_addr_copy(oethh->h_dest, ife->eth_dst); | |
815 | else | |
816 | ether_addr_copy(oethh->h_dest, iethh->h_dest); | |
817 | oethh->h_proto = htons(ife->eth_type); | |
818 | ||
819 | if (!(at & AT_EGRESS)) | |
820 | skb_pull(skb, skb->dev->hard_header_len); | |
821 | ||
822 | spin_unlock(&ife->tcf_lock); | |
823 | ||
824 | return action; | |
825 | } | |
826 | ||
827 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
828 | struct tcf_result *res) | |
829 | { | |
a85a970a | 830 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
831 | |
832 | if (ife->flags & IFE_ENCODE) | |
833 | return tcf_ife_encode(skb, a, res); | |
834 | ||
835 | if (!(ife->flags & IFE_ENCODE)) | |
836 | return tcf_ife_decode(skb, a, res); | |
837 | ||
838 | pr_info_ratelimited("unknown failure(policy neither de/encode\n"); | |
839 | spin_lock(&ife->tcf_lock); | |
840 | bstats_update(&ife->tcf_bstats, skb); | |
9c4a4e48 | 841 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
842 | ife->tcf_qstats.drops++; |
843 | spin_unlock(&ife->tcf_lock); | |
844 | ||
845 | return TC_ACT_SHOT; | |
846 | } | |
847 | ||
848 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
849 | struct netlink_callback *cb, int type, | |
a85a970a | 850 | const struct tc_action_ops *ops) |
ef6980b6 JHS |
851 | { |
852 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
853 | ||
a85a970a | 854 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ef6980b6 JHS |
855 | } |
856 | ||
a85a970a | 857 | static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) |
ef6980b6 JHS |
858 | { |
859 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
860 | ||
861 | return tcf_hash_search(tn, a, index); | |
862 | } | |
863 | ||
864 | static struct tc_action_ops act_ife_ops = { | |
865 | .kind = "ife", | |
866 | .type = TCA_ACT_IFE, | |
867 | .owner = THIS_MODULE, | |
868 | .act = tcf_ife_act, | |
869 | .dump = tcf_ife_dump, | |
870 | .cleanup = tcf_ife_cleanup, | |
871 | .init = tcf_ife_init, | |
872 | .walk = tcf_ife_walker, | |
873 | .lookup = tcf_ife_search, | |
a85a970a | 874 | .size = sizeof(struct tcf_ife_info), |
ef6980b6 JHS |
875 | }; |
876 | ||
877 | static __net_init int ife_init_net(struct net *net) | |
878 | { | |
879 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
880 | ||
881 | return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK); | |
882 | } | |
883 | ||
884 | static void __net_exit ife_exit_net(struct net *net) | |
885 | { | |
886 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
887 | ||
888 | tc_action_net_exit(tn); | |
889 | } | |
890 | ||
891 | static struct pernet_operations ife_net_ops = { | |
892 | .init = ife_init_net, | |
893 | .exit = ife_exit_net, | |
894 | .id = &ife_net_id, | |
895 | .size = sizeof(struct tc_action_net), | |
896 | }; | |
897 | ||
898 | static int __init ife_init_module(void) | |
899 | { | |
900 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
901 | } | |
902 | ||
903 | static void __exit ife_cleanup_module(void) | |
904 | { | |
905 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
906 | } | |
907 | ||
908 | module_init(ife_init_module); | |
909 | module_exit(ife_cleanup_module); | |
910 | ||
911 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
912 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
913 | MODULE_LICENSE("GPL"); |