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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> | |
11a94d7f | 32 | #include <net/pkt_cls.h> |
ef6980b6 JHS |
33 | #include <uapi/linux/tc_act/tc_ife.h> |
34 | #include <net/tc_act/tc_ife.h> | |
35 | #include <linux/etherdevice.h> | |
295a6e06 | 36 | #include <net/ife.h> |
ef6980b6 | 37 | |
c7d03a00 | 38 | static unsigned int ife_net_id; |
ef6980b6 | 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 | ||
6a5d58b6 JHS |
49 | int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi) |
50 | { | |
51 | u16 edata = 0; | |
52 | ||
53 | if (mi->metaval) | |
54 | edata = *(u16 *)mi->metaval; | |
55 | else if (metaval) | |
56 | edata = metaval; | |
57 | ||
58 | if (!edata) /* will not encode */ | |
59 | return 0; | |
60 | ||
61 | edata = htons(edata); | |
62 | return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(ife_encode_meta_u16); | |
65 | ||
ef6980b6 JHS |
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 | ||
6a5d58b6 JHS |
84 | int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi) |
85 | { | |
86 | if (metaval || mi->metaval) | |
87 | return 8; /* T+L+(V) == 2+2+(2+2bytepad) */ | |
88 | ||
89 | return 0; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(ife_check_meta_u16); | |
92 | ||
ef6980b6 JHS |
93 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) |
94 | { | |
95 | u32 edata = metaval; | |
96 | ||
97 | if (mi->metaval) | |
98 | edata = *(u32 *)mi->metaval; | |
99 | else if (metaval) | |
100 | edata = metaval; | |
101 | ||
102 | if (!edata) /* will not encode */ | |
103 | return 0; | |
104 | ||
105 | edata = htonl(edata); | |
106 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
109 | ||
110 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
111 | { | |
112 | if (mi->metaval) | |
113 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
114 | else | |
115 | return nla_put(skb, mi->metaid, 0, NULL); | |
116 | } | |
117 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
118 | ||
067a7cd0 | 119 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 120 | { |
067a7cd0 | 121 | mi->metaval = kmemdup(metaval, sizeof(u32), gfp); |
ef6980b6 JHS |
122 | if (!mi->metaval) |
123 | return -ENOMEM; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
128 | ||
067a7cd0 | 129 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 130 | { |
067a7cd0 | 131 | mi->metaval = kmemdup(metaval, sizeof(u16), gfp); |
ef6980b6 JHS |
132 | if (!mi->metaval) |
133 | return -ENOMEM; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
138 | ||
139 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
140 | { | |
141 | kfree(mi->metaval); | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
144 | ||
145 | int ife_validate_meta_u32(void *val, int len) | |
146 | { | |
28a10c42 | 147 | if (len == sizeof(u32)) |
ef6980b6 JHS |
148 | return 0; |
149 | ||
150 | return -EINVAL; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
153 | ||
154 | int ife_validate_meta_u16(void *val, int len) | |
155 | { | |
28a10c42 JHS |
156 | /* length will not include padding */ |
157 | if (len == sizeof(u16)) | |
ef6980b6 JHS |
158 | return 0; |
159 | ||
160 | return -EINVAL; | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
163 | ||
164 | static LIST_HEAD(ifeoplist); | |
165 | static DEFINE_RWLOCK(ife_mod_lock); | |
166 | ||
167 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
168 | { | |
169 | struct tcf_meta_ops *o; | |
170 | ||
8ce5be1c | 171 | read_lock(&ife_mod_lock); |
ef6980b6 JHS |
172 | list_for_each_entry(o, &ifeoplist, list) { |
173 | if (o->metaid == metaid) { | |
174 | if (!try_module_get(o->owner)) | |
175 | o = NULL; | |
8ce5be1c | 176 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
177 | return o; |
178 | } | |
179 | } | |
8ce5be1c | 180 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
181 | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | int register_ife_op(struct tcf_meta_ops *mops) | |
186 | { | |
187 | struct tcf_meta_ops *m; | |
188 | ||
189 | if (!mops->metaid || !mops->metatype || !mops->name || | |
190 | !mops->check_presence || !mops->encode || !mops->decode || | |
191 | !mops->get || !mops->alloc) | |
192 | return -EINVAL; | |
193 | ||
8ce5be1c | 194 | write_lock(&ife_mod_lock); |
ef6980b6 JHS |
195 | |
196 | list_for_each_entry(m, &ifeoplist, list) { | |
197 | if (m->metaid == mops->metaid || | |
198 | (strcmp(mops->name, m->name) == 0)) { | |
8ce5be1c | 199 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
200 | return -EEXIST; |
201 | } | |
202 | } | |
203 | ||
204 | if (!mops->release) | |
205 | mops->release = ife_release_meta_gen; | |
206 | ||
207 | list_add_tail(&mops->list, &ifeoplist); | |
8ce5be1c | 208 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
209 | return 0; |
210 | } | |
211 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
212 | ||
213 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
214 | { | |
215 | struct tcf_meta_ops *m; | |
216 | int err = -ENOENT; | |
217 | ||
8ce5be1c | 218 | write_lock(&ife_mod_lock); |
ef6980b6 JHS |
219 | list_for_each_entry(m, &ifeoplist, list) { |
220 | if (m->metaid == mops->metaid) { | |
221 | list_del(&mops->list); | |
222 | err = 0; | |
223 | break; | |
224 | } | |
225 | } | |
8ce5be1c | 226 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
227 | |
228 | return err; | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(register_ife_op); | |
231 | ||
232 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
233 | { | |
234 | int ret = 0; | |
235 | /* XXX: unfortunately cant use nla_policy at this point | |
236 | * because a length of 0 is valid in the case of | |
237 | * "allow". "use" semantics do enforce for proper | |
238 | * length and i couldve use nla_policy but it makes it hard | |
239 | * to use it just for that.. | |
240 | */ | |
241 | if (ops->validate) | |
242 | return ops->validate(val, len); | |
243 | ||
244 | if (ops->metatype == NLA_U32) | |
245 | ret = ife_validate_meta_u32(val, len); | |
246 | else if (ops->metatype == NLA_U16) | |
247 | ret = ife_validate_meta_u16(val, len); | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
65787594 | 252 | #ifdef CONFIG_MODULES |
d3f24ba8 RM |
253 | static const char *ife_meta_id2name(u32 metaid) |
254 | { | |
255 | switch (metaid) { | |
256 | case IFE_META_SKBMARK: | |
257 | return "skbmark"; | |
258 | case IFE_META_PRIO: | |
259 | return "skbprio"; | |
260 | case IFE_META_TCINDEX: | |
261 | return "tcindex"; | |
262 | default: | |
263 | return "unknown"; | |
264 | } | |
265 | } | |
65787594 | 266 | #endif |
d3f24ba8 | 267 | |
ef6980b6 | 268 | /* called when adding new meta information |
ef6980b6 | 269 | */ |
4e407ff5 | 270 | static int load_metaops_and_vet(u32 metaid, void *val, int len, bool rtnl_held) |
ef6980b6 JHS |
271 | { |
272 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
273 | int ret = 0; | |
274 | ||
275 | if (!ops) { | |
276 | ret = -ENOENT; | |
277 | #ifdef CONFIG_MODULES | |
54d0d423 VB |
278 | if (rtnl_held) |
279 | rtnl_unlock(); | |
d3f24ba8 | 280 | request_module("ife-meta-%s", ife_meta_id2name(metaid)); |
54d0d423 VB |
281 | if (rtnl_held) |
282 | rtnl_lock(); | |
ef6980b6 JHS |
283 | ops = find_ife_oplist(metaid); |
284 | #endif | |
285 | } | |
286 | ||
287 | if (ops) { | |
288 | ret = 0; | |
289 | if (len) | |
290 | ret = ife_validate_metatype(ops, val, len); | |
291 | ||
292 | module_put(ops->owner); | |
293 | } | |
294 | ||
295 | return ret; | |
296 | } | |
297 | ||
298 | /* called when adding new meta information | |
ef6980b6 | 299 | */ |
5ffe57da CW |
300 | static int __add_metainfo(const struct tcf_meta_ops *ops, |
301 | struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
302 | int len, bool atomic, bool exists) | |
ef6980b6 JHS |
303 | { |
304 | struct tcf_meta_info *mi = NULL; | |
ef6980b6 JHS |
305 | int ret = 0; |
306 | ||
817e9f2c | 307 | mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); |
5ffe57da | 308 | if (!mi) |
ef6980b6 | 309 | return -ENOMEM; |
ef6980b6 JHS |
310 | |
311 | mi->metaid = metaid; | |
312 | mi->ops = ops; | |
313 | if (len > 0) { | |
817e9f2c | 314 | ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
315 | if (ret != 0) { |
316 | kfree(mi); | |
ef6980b6 JHS |
317 | return ret; |
318 | } | |
319 | } | |
320 | ||
4e407ff5 CW |
321 | if (exists) |
322 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 | 323 | list_add_tail(&mi->metalist, &ife->metalist); |
4e407ff5 CW |
324 | if (exists) |
325 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
84cb8eb2 VB |
330 | static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops, |
331 | struct tcf_ife_info *ife, u32 metaid, | |
332 | bool exists) | |
333 | { | |
334 | int ret; | |
335 | ||
336 | if (!try_module_get(ops->owner)) | |
337 | return -ENOENT; | |
338 | ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists); | |
339 | if (ret) | |
340 | module_put(ops->owner); | |
341 | return ret; | |
342 | } | |
343 | ||
5ffe57da CW |
344 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, |
345 | int len, bool exists) | |
346 | { | |
347 | const struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
348 | int ret; | |
349 | ||
350 | if (!ops) | |
351 | return -ENOENT; | |
352 | ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists); | |
353 | if (ret) | |
354 | /*put back what find_ife_oplist took */ | |
355 | module_put(ops->owner); | |
356 | return ret; | |
357 | } | |
358 | ||
4e407ff5 | 359 | static int use_all_metadata(struct tcf_ife_info *ife, bool exists) |
ef6980b6 JHS |
360 | { |
361 | struct tcf_meta_ops *o; | |
362 | int rc = 0; | |
363 | int installed = 0; | |
364 | ||
8ce5be1c | 365 | read_lock(&ife_mod_lock); |
ef6980b6 | 366 | list_for_each_entry(o, &ifeoplist, list) { |
84cb8eb2 | 367 | rc = add_metainfo_and_get_ops(o, ife, o->metaid, exists); |
ef6980b6 JHS |
368 | if (rc == 0) |
369 | installed += 1; | |
370 | } | |
8ce5be1c | 371 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
372 | |
373 | if (installed) | |
374 | return 0; | |
375 | else | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
380 | { | |
381 | struct tcf_meta_info *e; | |
382 | struct nlattr *nest; | |
383 | unsigned char *b = skb_tail_pointer(skb); | |
384 | int total_encoded = 0; | |
385 | ||
386 | /*can only happen on decode */ | |
387 | if (list_empty(&ife->metalist)) | |
388 | return 0; | |
389 | ||
ae0be8de | 390 | nest = nla_nest_start_noflag(skb, TCA_IFE_METALST); |
ef6980b6 JHS |
391 | if (!nest) |
392 | goto out_nlmsg_trim; | |
393 | ||
394 | list_for_each_entry(e, &ife->metalist, metalist) { | |
395 | if (!e->ops->get(skb, e)) | |
396 | total_encoded += 1; | |
397 | } | |
398 | ||
399 | if (!total_encoded) | |
400 | goto out_nlmsg_trim; | |
401 | ||
402 | nla_nest_end(skb, nest); | |
403 | ||
404 | return 0; | |
405 | ||
406 | out_nlmsg_trim: | |
407 | nlmsg_trim(skb, b); | |
408 | return -1; | |
409 | } | |
410 | ||
411 | /* under ife->tcf_lock */ | |
9a63b255 | 412 | static void _tcf_ife_cleanup(struct tc_action *a) |
ef6980b6 | 413 | { |
a85a970a | 414 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
415 | struct tcf_meta_info *e, *n; |
416 | ||
417 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
ef6980b6 JHS |
418 | list_del(&e->metalist); |
419 | if (e->metaval) { | |
420 | if (e->ops->release) | |
421 | e->ops->release(e); | |
422 | else | |
423 | kfree(e->metaval); | |
424 | } | |
6d784f16 | 425 | module_put(e->ops->owner); |
ef6980b6 JHS |
426 | kfree(e); |
427 | } | |
428 | } | |
429 | ||
9a63b255 | 430 | static void tcf_ife_cleanup(struct tc_action *a) |
ef6980b6 | 431 | { |
a85a970a | 432 | struct tcf_ife_info *ife = to_ife(a); |
aa9fd9a3 | 433 | struct tcf_ife_params *p; |
ef6980b6 JHS |
434 | |
435 | spin_lock_bh(&ife->tcf_lock); | |
9a63b255 | 436 | _tcf_ife_cleanup(a); |
ef6980b6 | 437 | spin_unlock_bh(&ife->tcf_lock); |
aa9fd9a3 AA |
438 | |
439 | p = rcu_dereference_protected(ife->params, 1); | |
0a889b94 DC |
440 | if (p) |
441 | kfree_rcu(p, rcu); | |
ef6980b6 JHS |
442 | } |
443 | ||
067a7cd0 | 444 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, |
54d0d423 | 445 | bool exists, bool rtnl_held) |
ef6980b6 JHS |
446 | { |
447 | int len = 0; | |
448 | int rc = 0; | |
449 | int i = 0; | |
450 | void *val; | |
451 | ||
452 | for (i = 1; i < max_metacnt; i++) { | |
453 | if (tb[i]) { | |
454 | val = nla_data(tb[i]); | |
455 | len = nla_len(tb[i]); | |
456 | ||
4e407ff5 | 457 | rc = load_metaops_and_vet(i, val, len, rtnl_held); |
ef6980b6 JHS |
458 | if (rc != 0) |
459 | return rc; | |
460 | ||
5ffe57da | 461 | rc = add_metainfo(ife, i, val, len, exists); |
ef6980b6 JHS |
462 | if (rc) |
463 | return rc; | |
464 | } | |
465 | } | |
466 | ||
467 | return rc; | |
468 | } | |
469 | ||
470 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
a85a970a | 471 | struct nlattr *est, struct tc_action **a, |
789871bb | 472 | int ovr, int bind, bool rtnl_held, |
85d0966f | 473 | struct tcf_proto *tp, struct netlink_ext_ack *extack) |
ef6980b6 JHS |
474 | { |
475 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
476 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
477 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
11a94d7f | 478 | struct tcf_chain *goto_ch = NULL; |
54d0d423 | 479 | struct tcf_ife_params *p; |
ef6980b6 | 480 | struct tcf_ife_info *ife; |
b522ed6e | 481 | u16 ife_type = ETH_P_IFE; |
ef6980b6 | 482 | struct tc_ife *parm; |
ef6980b6 JHS |
483 | u8 *daddr = NULL; |
484 | u8 *saddr = NULL; | |
b2313077 WC |
485 | bool exists = false; |
486 | int ret = 0; | |
ef6980b6 JHS |
487 | int err; |
488 | ||
fceb6435 | 489 | err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL); |
ef6980b6 JHS |
490 | if (err < 0) |
491 | return err; | |
492 | ||
493 | if (!tb[TCA_IFE_PARMS]) | |
494 | return -EINVAL; | |
495 | ||
496 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
497 | ||
734534e9 AA |
498 | /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because |
499 | * they cannot run as the same time. Check on all other values which | |
500 | * are not supported right now. | |
501 | */ | |
502 | if (parm->flags & ~IFE_ENCODE) | |
503 | return -EINVAL; | |
504 | ||
aa9fd9a3 AA |
505 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
506 | if (!p) | |
507 | return -ENOMEM; | |
508 | ||
0190c1d4 | 509 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
01e866bf VB |
510 | if (err < 0) { |
511 | kfree(p); | |
0190c1d4 | 512 | return err; |
01e866bf | 513 | } |
0190c1d4 | 514 | exists = err; |
aa9fd9a3 AA |
515 | if (exists && bind) { |
516 | kfree(p); | |
4e8c8615 | 517 | return 0; |
aa9fd9a3 | 518 | } |
4e8c8615 | 519 | |
4e8c8615 | 520 | if (!exists) { |
65a206c0 | 521 | ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops, |
ced273ea | 522 | bind, true); |
aa9fd9a3 | 523 | if (ret) { |
0190c1d4 | 524 | tcf_idr_cleanup(tn, parm->index); |
aa9fd9a3 | 525 | kfree(p); |
ef6980b6 | 526 | return ret; |
aa9fd9a3 | 527 | } |
ef6980b6 | 528 | ret = ACT_P_CREATED; |
4e8ddd7f | 529 | } else if (!ovr) { |
65a206c0 | 530 | tcf_idr_release(*a, bind); |
4e8ddd7f VB |
531 | kfree(p); |
532 | return -EEXIST; | |
ef6980b6 JHS |
533 | } |
534 | ||
a85a970a | 535 | ife = to_ife(*a); |
11a94d7f DC |
536 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
537 | if (err < 0) | |
538 | goto release_idr; | |
539 | ||
aa9fd9a3 | 540 | p->flags = parm->flags; |
ef6980b6 JHS |
541 | |
542 | if (parm->flags & IFE_ENCODE) { | |
b522ed6e AA |
543 | if (tb[TCA_IFE_TYPE]) |
544 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
ef6980b6 JHS |
545 | if (tb[TCA_IFE_DMAC]) |
546 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
547 | if (tb[TCA_IFE_SMAC]) | |
548 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
549 | } | |
550 | ||
ef6980b6 JHS |
551 | if (parm->flags & IFE_ENCODE) { |
552 | if (daddr) | |
aa9fd9a3 | 553 | ether_addr_copy(p->eth_dst, daddr); |
ef6980b6 | 554 | else |
aa9fd9a3 | 555 | eth_zero_addr(p->eth_dst); |
ef6980b6 JHS |
556 | |
557 | if (saddr) | |
aa9fd9a3 | 558 | ether_addr_copy(p->eth_src, saddr); |
ef6980b6 | 559 | else |
aa9fd9a3 | 560 | eth_zero_addr(p->eth_src); |
ef6980b6 | 561 | |
aa9fd9a3 | 562 | p->eth_type = ife_type; |
ef6980b6 JHS |
563 | } |
564 | ||
aa9fd9a3 | 565 | |
ef6980b6 JHS |
566 | if (ret == ACT_P_CREATED) |
567 | INIT_LIST_HEAD(&ife->metalist); | |
568 | ||
569 | if (tb[TCA_IFE_METALST]) { | |
570 | err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST], | |
fceb6435 | 571 | NULL, NULL); |
11a94d7f DC |
572 | if (err) |
573 | goto metadata_parse_err; | |
54d0d423 | 574 | err = populate_metalist(ife, tb2, exists, rtnl_held); |
ef6980b6 JHS |
575 | if (err) |
576 | goto metadata_parse_err; | |
577 | ||
578 | } else { | |
579 | /* if no passed metadata allow list or passed allow-all | |
580 | * then here we process by adding as many supported metadatum | |
581 | * as we can. You better have at least one else we are | |
582 | * going to bail out | |
583 | */ | |
4e407ff5 | 584 | err = use_all_metadata(ife, exists); |
11a94d7f DC |
585 | if (err) |
586 | goto metadata_parse_err; | |
ef6980b6 JHS |
587 | } |
588 | ||
4e407ff5 CW |
589 | if (exists) |
590 | spin_lock_bh(&ife->tcf_lock); | |
54d0d423 | 591 | /* protected by tcf_lock when modifying existing action */ |
11a94d7f | 592 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
54d0d423 VB |
593 | rcu_swap_protected(ife->params, p, 1); |
594 | ||
067a7cd0 WC |
595 | if (exists) |
596 | spin_unlock_bh(&ife->tcf_lock); | |
11a94d7f DC |
597 | if (goto_ch) |
598 | tcf_chain_put_by_act(goto_ch); | |
54d0d423 VB |
599 | if (p) |
600 | kfree_rcu(p, rcu); | |
aa9fd9a3 | 601 | |
ef6980b6 | 602 | if (ret == ACT_P_CREATED) |
65a206c0 | 603 | tcf_idr_insert(tn, *a); |
ef6980b6 JHS |
604 | |
605 | return ret; | |
11a94d7f DC |
606 | metadata_parse_err: |
607 | if (goto_ch) | |
608 | tcf_chain_put_by_act(goto_ch); | |
609 | release_idr: | |
610 | kfree(p); | |
611 | tcf_idr_release(*a, bind); | |
612 | return err; | |
ef6980b6 JHS |
613 | } |
614 | ||
615 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
616 | int ref) | |
617 | { | |
618 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 619 | struct tcf_ife_info *ife = to_ife(a); |
54d0d423 | 620 | struct tcf_ife_params *p; |
ef6980b6 JHS |
621 | struct tc_ife opt = { |
622 | .index = ife->tcf_index, | |
036bb443 VB |
623 | .refcnt = refcount_read(&ife->tcf_refcnt) - ref, |
624 | .bindcnt = atomic_read(&ife->tcf_bindcnt) - bind, | |
ef6980b6 JHS |
625 | }; |
626 | struct tcf_t t; | |
627 | ||
54d0d423 VB |
628 | spin_lock_bh(&ife->tcf_lock); |
629 | opt.action = ife->tcf_action; | |
630 | p = rcu_dereference_protected(ife->params, | |
631 | lockdep_is_held(&ife->tcf_lock)); | |
632 | opt.flags = p->flags; | |
633 | ||
ef6980b6 JHS |
634 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) |
635 | goto nla_put_failure; | |
636 | ||
48d8ee16 | 637 | tcf_tm_dump(&t, &ife->tcf_tm); |
9854518e | 638 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
639 | goto nla_put_failure; |
640 | ||
aa9fd9a3 AA |
641 | if (!is_zero_ether_addr(p->eth_dst)) { |
642 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, p->eth_dst)) | |
ef6980b6 JHS |
643 | goto nla_put_failure; |
644 | } | |
645 | ||
aa9fd9a3 AA |
646 | if (!is_zero_ether_addr(p->eth_src)) { |
647 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, p->eth_src)) | |
ef6980b6 JHS |
648 | goto nla_put_failure; |
649 | } | |
650 | ||
aa9fd9a3 | 651 | if (nla_put(skb, TCA_IFE_TYPE, 2, &p->eth_type)) |
ef6980b6 JHS |
652 | goto nla_put_failure; |
653 | ||
654 | if (dump_metalist(skb, ife)) { | |
655 | /*ignore failure to dump metalist */ | |
656 | pr_info("Failed to dump metalist\n"); | |
657 | } | |
658 | ||
54d0d423 | 659 | spin_unlock_bh(&ife->tcf_lock); |
ef6980b6 JHS |
660 | return skb->len; |
661 | ||
662 | nla_put_failure: | |
54d0d423 | 663 | spin_unlock_bh(&ife->tcf_lock); |
ef6980b6 JHS |
664 | nlmsg_trim(skb, b); |
665 | return -1; | |
666 | } | |
667 | ||
4dba87b0 OG |
668 | static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, |
669 | u16 metaid, u16 mlen, void *mdata) | |
ef6980b6 JHS |
670 | { |
671 | struct tcf_meta_info *e; | |
672 | ||
673 | /* XXX: use hash to speed up */ | |
674 | list_for_each_entry(e, &ife->metalist, metalist) { | |
675 | if (metaid == e->metaid) { | |
676 | if (e->ops) { | |
677 | /* We check for decode presence already */ | |
678 | return e->ops->decode(skb, mdata, mlen); | |
679 | } | |
680 | } | |
681 | } | |
682 | ||
f6cd1453 | 683 | return -ENOENT; |
ef6980b6 JHS |
684 | } |
685 | ||
ef6980b6 JHS |
686 | static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, |
687 | struct tcf_result *res) | |
688 | { | |
a85a970a | 689 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 | 690 | int action = ife->tcf_action; |
295a6e06 YG |
691 | u8 *ifehdr_end; |
692 | u8 *tlv_data; | |
693 | u16 metalen; | |
ef6980b6 | 694 | |
ced273ea | 695 | bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb); |
9c4a4e48 | 696 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 | 697 | |
295a6e06 YG |
698 | if (skb_at_tc_ingress(skb)) |
699 | skb_push(skb, skb->dev->hard_header_len); | |
700 | ||
701 | tlv_data = ife_decode(skb, &metalen); | |
702 | if (unlikely(!tlv_data)) { | |
ced273ea | 703 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
704 | return TC_ACT_SHOT; |
705 | } | |
706 | ||
295a6e06 YG |
707 | ifehdr_end = tlv_data + metalen; |
708 | for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { | |
709 | u8 *curr_data; | |
710 | u16 mtype; | |
711 | u16 dlen; | |
ef6980b6 | 712 | |
cc74eddd AA |
713 | curr_data = ife_tlv_meta_decode(tlv_data, ifehdr_end, &mtype, |
714 | &dlen, NULL); | |
715 | if (!curr_data) { | |
716 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); | |
717 | return TC_ACT_SHOT; | |
718 | } | |
ef6980b6 | 719 | |
295a6e06 | 720 | if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { |
ef6980b6 JHS |
721 | /* abuse overlimits to count when we receive metadata |
722 | * but dont have an ops for it | |
723 | */ | |
295a6e06 YG |
724 | pr_info_ratelimited("Unknown metaid %d dlen %d\n", |
725 | mtype, dlen); | |
ced273ea | 726 | qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 | 727 | } |
295a6e06 | 728 | } |
ef6980b6 | 729 | |
295a6e06 | 730 | if (WARN_ON(tlv_data != ifehdr_end)) { |
ced273ea | 731 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
295a6e06 | 732 | return TC_ACT_SHOT; |
ef6980b6 JHS |
733 | } |
734 | ||
295a6e06 | 735 | skb->protocol = eth_type_trans(skb, skb->dev); |
ef6980b6 | 736 | skb_reset_network_header(skb); |
295a6e06 | 737 | |
ef6980b6 JHS |
738 | return action; |
739 | } | |
740 | ||
741 | /*XXX: check if we can do this at install time instead of current | |
742 | * send data path | |
743 | **/ | |
744 | static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) | |
745 | { | |
746 | struct tcf_meta_info *e, *n; | |
747 | int tot_run_sz = 0, run_sz = 0; | |
748 | ||
749 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
750 | if (e->ops->check_presence) { | |
751 | run_sz = e->ops->check_presence(skb, e); | |
752 | tot_run_sz += run_sz; | |
753 | } | |
754 | } | |
755 | ||
756 | return tot_run_sz; | |
757 | } | |
758 | ||
759 | static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, | |
aa9fd9a3 | 760 | struct tcf_result *res, struct tcf_ife_params *p) |
ef6980b6 | 761 | { |
a85a970a | 762 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
763 | int action = ife->tcf_action; |
764 | struct ethhdr *oethh; /* outer ether header */ | |
ef6980b6 JHS |
765 | struct tcf_meta_info *e; |
766 | /* | |
767 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
768 | where ORIGDATA = original ethernet header ... | |
769 | */ | |
770 | u16 metalen = ife_get_sz(skb, ife); | |
771 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
295a6e06 | 772 | unsigned int skboff = 0; |
ef6980b6 JHS |
773 | int new_len = skb->len + hdrm; |
774 | bool exceed_mtu = false; | |
295a6e06 YG |
775 | void *ife_meta; |
776 | int err = 0; | |
ef6980b6 | 777 | |
a5135bcf | 778 | if (!skb_at_tc_ingress(skb)) { |
ef6980b6 JHS |
779 | if (new_len > skb->dev->mtu) |
780 | exceed_mtu = true; | |
781 | } | |
782 | ||
ced273ea | 783 | bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb); |
9c4a4e48 | 784 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
785 | |
786 | if (!metalen) { /* no metadata to send */ | |
787 | /* abuse overlimits to count when we allow packet | |
788 | * with no metadata | |
789 | */ | |
ced273ea | 790 | qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
791 | return action; |
792 | } | |
793 | /* could be stupid policy setup or mtu config | |
794 | * so lets be conservative.. */ | |
795 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
ced273ea | 796 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
797 | return TC_ACT_SHOT; |
798 | } | |
799 | ||
a5135bcf | 800 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
801 | skb_push(skb, skb->dev->hard_header_len); |
802 | ||
295a6e06 | 803 | ife_meta = ife_encode(skb, metalen); |
ef6980b6 | 804 | |
ced273ea AA |
805 | spin_lock(&ife->tcf_lock); |
806 | ||
ef6980b6 JHS |
807 | /* XXX: we dont have a clever way of telling encode to |
808 | * not repeat some of the computations that are done by | |
809 | * ops->presence_check... | |
810 | */ | |
811 | list_for_each_entry(e, &ife->metalist, metalist) { | |
812 | if (e->ops->encode) { | |
295a6e06 | 813 | err = e->ops->encode(skb, (void *)(ife_meta + skboff), |
ef6980b6 JHS |
814 | e); |
815 | } | |
816 | if (err < 0) { | |
817 | /* too corrupt to keep around if overwritten */ | |
ef6980b6 | 818 | spin_unlock(&ife->tcf_lock); |
ced273ea | 819 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
820 | return TC_ACT_SHOT; |
821 | } | |
822 | skboff += err; | |
823 | } | |
aa9fd9a3 | 824 | spin_unlock(&ife->tcf_lock); |
295a6e06 | 825 | oethh = (struct ethhdr *)skb->data; |
ef6980b6 | 826 | |
aa9fd9a3 AA |
827 | if (!is_zero_ether_addr(p->eth_src)) |
828 | ether_addr_copy(oethh->h_source, p->eth_src); | |
829 | if (!is_zero_ether_addr(p->eth_dst)) | |
830 | ether_addr_copy(oethh->h_dest, p->eth_dst); | |
831 | oethh->h_proto = htons(p->eth_type); | |
ef6980b6 | 832 | |
a5135bcf | 833 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
834 | skb_pull(skb, skb->dev->hard_header_len); |
835 | ||
ef6980b6 JHS |
836 | return action; |
837 | } | |
838 | ||
839 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
840 | struct tcf_result *res) | |
841 | { | |
a85a970a | 842 | struct tcf_ife_info *ife = to_ife(a); |
aa9fd9a3 AA |
843 | struct tcf_ife_params *p; |
844 | int ret; | |
845 | ||
7fd4b288 | 846 | p = rcu_dereference_bh(ife->params); |
aa9fd9a3 AA |
847 | if (p->flags & IFE_ENCODE) { |
848 | ret = tcf_ife_encode(skb, a, res, p); | |
aa9fd9a3 AA |
849 | return ret; |
850 | } | |
ef6980b6 | 851 | |
734534e9 | 852 | return tcf_ife_decode(skb, a, res); |
ef6980b6 JHS |
853 | } |
854 | ||
855 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
856 | struct netlink_callback *cb, int type, | |
41780105 AA |
857 | const struct tc_action_ops *ops, |
858 | struct netlink_ext_ack *extack) | |
ef6980b6 JHS |
859 | { |
860 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
861 | ||
b3620145 | 862 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ef6980b6 JHS |
863 | } |
864 | ||
f061b48c | 865 | static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) |
ef6980b6 JHS |
866 | { |
867 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
868 | ||
65a206c0 | 869 | return tcf_idr_search(tn, a, index); |
ef6980b6 JHS |
870 | } |
871 | ||
872 | static struct tc_action_ops act_ife_ops = { | |
873 | .kind = "ife", | |
eddd2cf1 | 874 | .id = TCA_ID_IFE, |
ef6980b6 JHS |
875 | .owner = THIS_MODULE, |
876 | .act = tcf_ife_act, | |
877 | .dump = tcf_ife_dump, | |
878 | .cleanup = tcf_ife_cleanup, | |
879 | .init = tcf_ife_init, | |
880 | .walk = tcf_ife_walker, | |
881 | .lookup = tcf_ife_search, | |
a85a970a | 882 | .size = sizeof(struct tcf_ife_info), |
ef6980b6 JHS |
883 | }; |
884 | ||
885 | static __net_init int ife_init_net(struct net *net) | |
886 | { | |
887 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
888 | ||
c7e460ce | 889 | return tc_action_net_init(tn, &act_ife_ops); |
ef6980b6 JHS |
890 | } |
891 | ||
039af9c6 | 892 | static void __net_exit ife_exit_net(struct list_head *net_list) |
ef6980b6 | 893 | { |
039af9c6 | 894 | tc_action_net_exit(net_list, ife_net_id); |
ef6980b6 JHS |
895 | } |
896 | ||
897 | static struct pernet_operations ife_net_ops = { | |
898 | .init = ife_init_net, | |
039af9c6 | 899 | .exit_batch = ife_exit_net, |
ef6980b6 JHS |
900 | .id = &ife_net_id, |
901 | .size = sizeof(struct tc_action_net), | |
902 | }; | |
903 | ||
904 | static int __init ife_init_module(void) | |
905 | { | |
906 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
907 | } | |
908 | ||
909 | static void __exit ife_cleanup_module(void) | |
910 | { | |
911 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
912 | } | |
913 | ||
914 | module_init(ife_init_module); | |
915 | module_exit(ife_cleanup_module); | |
916 | ||
917 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
918 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
919 | MODULE_LICENSE("GPL"); |