Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ef6980b6 JHS |
2 | /* |
3 | * net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB | |
4 | * | |
5 | * Refer to: | |
6 | * draft-ietf-forces-interfelfb-03 | |
7 | * and | |
8 | * netdev01 paper: | |
9 | * "Distributing Linux Traffic Control Classifier-Action | |
10 | * Subsystem" | |
11 | * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai | |
12 | * | |
ef6980b6 | 13 | * copyright Jamal Hadi Salim (2015) |
ef6980b6 JHS |
14 | */ |
15 | ||
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <net/net_namespace.h> | |
25 | #include <net/netlink.h> | |
26 | #include <net/pkt_sched.h> | |
11a94d7f | 27 | #include <net/pkt_cls.h> |
ef6980b6 JHS |
28 | #include <uapi/linux/tc_act/tc_ife.h> |
29 | #include <net/tc_act/tc_ife.h> | |
30 | #include <linux/etherdevice.h> | |
295a6e06 | 31 | #include <net/ife.h> |
ef6980b6 | 32 | |
c7d03a00 | 33 | static unsigned int ife_net_id; |
ef6980b6 | 34 | static int max_metacnt = IFE_META_MAX + 1; |
a85a970a | 35 | static struct tc_action_ops act_ife_ops; |
ef6980b6 JHS |
36 | |
37 | static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = { | |
38 | [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)}, | |
39 | [TCA_IFE_DMAC] = { .len = ETH_ALEN}, | |
40 | [TCA_IFE_SMAC] = { .len = ETH_ALEN}, | |
41 | [TCA_IFE_TYPE] = { .type = NLA_U16}, | |
42 | }; | |
43 | ||
6a5d58b6 JHS |
44 | int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi) |
45 | { | |
46 | u16 edata = 0; | |
47 | ||
48 | if (mi->metaval) | |
49 | edata = *(u16 *)mi->metaval; | |
50 | else if (metaval) | |
51 | edata = metaval; | |
52 | ||
53 | if (!edata) /* will not encode */ | |
54 | return 0; | |
55 | ||
56 | edata = htons(edata); | |
57 | return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata); | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(ife_encode_meta_u16); | |
60 | ||
ef6980b6 JHS |
61 | int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi) |
62 | { | |
63 | if (mi->metaval) | |
64 | return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval); | |
65 | else | |
66 | return nla_put(skb, mi->metaid, 0, NULL); | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(ife_get_meta_u32); | |
69 | ||
70 | int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi) | |
71 | { | |
72 | if (metaval || mi->metaval) | |
73 | return 8; /* T+L+V == 2+2+4 */ | |
74 | ||
75 | return 0; | |
76 | } | |
77 | EXPORT_SYMBOL_GPL(ife_check_meta_u32); | |
78 | ||
6a5d58b6 JHS |
79 | int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi) |
80 | { | |
81 | if (metaval || mi->metaval) | |
82 | return 8; /* T+L+(V) == 2+2+(2+2bytepad) */ | |
83 | ||
84 | return 0; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(ife_check_meta_u16); | |
87 | ||
ef6980b6 JHS |
88 | int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi) |
89 | { | |
90 | u32 edata = metaval; | |
91 | ||
92 | if (mi->metaval) | |
93 | edata = *(u32 *)mi->metaval; | |
94 | else if (metaval) | |
95 | edata = metaval; | |
96 | ||
97 | if (!edata) /* will not encode */ | |
98 | return 0; | |
99 | ||
100 | edata = htonl(edata); | |
101 | return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata); | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(ife_encode_meta_u32); | |
104 | ||
105 | int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi) | |
106 | { | |
107 | if (mi->metaval) | |
108 | return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval); | |
109 | else | |
110 | return nla_put(skb, mi->metaid, 0, NULL); | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(ife_get_meta_u16); | |
113 | ||
067a7cd0 | 114 | int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 115 | { |
067a7cd0 | 116 | mi->metaval = kmemdup(metaval, sizeof(u32), gfp); |
ef6980b6 JHS |
117 | if (!mi->metaval) |
118 | return -ENOMEM; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u32); | |
123 | ||
067a7cd0 | 124 | int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp) |
ef6980b6 | 125 | { |
067a7cd0 | 126 | mi->metaval = kmemdup(metaval, sizeof(u16), gfp); |
ef6980b6 JHS |
127 | if (!mi->metaval) |
128 | return -ENOMEM; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(ife_alloc_meta_u16); | |
133 | ||
134 | void ife_release_meta_gen(struct tcf_meta_info *mi) | |
135 | { | |
136 | kfree(mi->metaval); | |
137 | } | |
138 | EXPORT_SYMBOL_GPL(ife_release_meta_gen); | |
139 | ||
140 | int ife_validate_meta_u32(void *val, int len) | |
141 | { | |
28a10c42 | 142 | if (len == sizeof(u32)) |
ef6980b6 JHS |
143 | return 0; |
144 | ||
145 | return -EINVAL; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(ife_validate_meta_u32); | |
148 | ||
149 | int ife_validate_meta_u16(void *val, int len) | |
150 | { | |
28a10c42 JHS |
151 | /* length will not include padding */ |
152 | if (len == sizeof(u16)) | |
ef6980b6 JHS |
153 | return 0; |
154 | ||
155 | return -EINVAL; | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(ife_validate_meta_u16); | |
158 | ||
159 | static LIST_HEAD(ifeoplist); | |
160 | static DEFINE_RWLOCK(ife_mod_lock); | |
161 | ||
162 | static struct tcf_meta_ops *find_ife_oplist(u16 metaid) | |
163 | { | |
164 | struct tcf_meta_ops *o; | |
165 | ||
8ce5be1c | 166 | read_lock(&ife_mod_lock); |
ef6980b6 JHS |
167 | list_for_each_entry(o, &ifeoplist, list) { |
168 | if (o->metaid == metaid) { | |
169 | if (!try_module_get(o->owner)) | |
170 | o = NULL; | |
8ce5be1c | 171 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
172 | return o; |
173 | } | |
174 | } | |
8ce5be1c | 175 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
176 | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | int register_ife_op(struct tcf_meta_ops *mops) | |
181 | { | |
182 | struct tcf_meta_ops *m; | |
183 | ||
184 | if (!mops->metaid || !mops->metatype || !mops->name || | |
185 | !mops->check_presence || !mops->encode || !mops->decode || | |
186 | !mops->get || !mops->alloc) | |
187 | return -EINVAL; | |
188 | ||
8ce5be1c | 189 | write_lock(&ife_mod_lock); |
ef6980b6 JHS |
190 | |
191 | list_for_each_entry(m, &ifeoplist, list) { | |
192 | if (m->metaid == mops->metaid || | |
193 | (strcmp(mops->name, m->name) == 0)) { | |
8ce5be1c | 194 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
195 | return -EEXIST; |
196 | } | |
197 | } | |
198 | ||
199 | if (!mops->release) | |
200 | mops->release = ife_release_meta_gen; | |
201 | ||
202 | list_add_tail(&mops->list, &ifeoplist); | |
8ce5be1c | 203 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
204 | return 0; |
205 | } | |
206 | EXPORT_SYMBOL_GPL(unregister_ife_op); | |
207 | ||
208 | int unregister_ife_op(struct tcf_meta_ops *mops) | |
209 | { | |
210 | struct tcf_meta_ops *m; | |
211 | int err = -ENOENT; | |
212 | ||
8ce5be1c | 213 | write_lock(&ife_mod_lock); |
ef6980b6 JHS |
214 | list_for_each_entry(m, &ifeoplist, list) { |
215 | if (m->metaid == mops->metaid) { | |
216 | list_del(&mops->list); | |
217 | err = 0; | |
218 | break; | |
219 | } | |
220 | } | |
8ce5be1c | 221 | write_unlock(&ife_mod_lock); |
ef6980b6 JHS |
222 | |
223 | return err; | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(register_ife_op); | |
226 | ||
227 | static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len) | |
228 | { | |
229 | int ret = 0; | |
230 | /* XXX: unfortunately cant use nla_policy at this point | |
231 | * because a length of 0 is valid in the case of | |
232 | * "allow". "use" semantics do enforce for proper | |
233 | * length and i couldve use nla_policy but it makes it hard | |
234 | * to use it just for that.. | |
235 | */ | |
236 | if (ops->validate) | |
237 | return ops->validate(val, len); | |
238 | ||
239 | if (ops->metatype == NLA_U32) | |
240 | ret = ife_validate_meta_u32(val, len); | |
241 | else if (ops->metatype == NLA_U16) | |
242 | ret = ife_validate_meta_u16(val, len); | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
65787594 | 247 | #ifdef CONFIG_MODULES |
d3f24ba8 RM |
248 | static const char *ife_meta_id2name(u32 metaid) |
249 | { | |
250 | switch (metaid) { | |
251 | case IFE_META_SKBMARK: | |
252 | return "skbmark"; | |
253 | case IFE_META_PRIO: | |
254 | return "skbprio"; | |
255 | case IFE_META_TCINDEX: | |
256 | return "tcindex"; | |
257 | default: | |
258 | return "unknown"; | |
259 | } | |
260 | } | |
65787594 | 261 | #endif |
d3f24ba8 | 262 | |
ef6980b6 | 263 | /* called when adding new meta information |
ef6980b6 | 264 | */ |
4e407ff5 | 265 | static int load_metaops_and_vet(u32 metaid, void *val, int len, bool rtnl_held) |
ef6980b6 JHS |
266 | { |
267 | struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
268 | int ret = 0; | |
269 | ||
270 | if (!ops) { | |
271 | ret = -ENOENT; | |
272 | #ifdef CONFIG_MODULES | |
54d0d423 VB |
273 | if (rtnl_held) |
274 | rtnl_unlock(); | |
d3f24ba8 | 275 | request_module("ife-meta-%s", ife_meta_id2name(metaid)); |
54d0d423 VB |
276 | if (rtnl_held) |
277 | rtnl_lock(); | |
ef6980b6 JHS |
278 | ops = find_ife_oplist(metaid); |
279 | #endif | |
280 | } | |
281 | ||
282 | if (ops) { | |
283 | ret = 0; | |
284 | if (len) | |
285 | ret = ife_validate_metatype(ops, val, len); | |
286 | ||
287 | module_put(ops->owner); | |
288 | } | |
289 | ||
290 | return ret; | |
291 | } | |
292 | ||
293 | /* called when adding new meta information | |
ef6980b6 | 294 | */ |
5ffe57da CW |
295 | static int __add_metainfo(const struct tcf_meta_ops *ops, |
296 | struct tcf_ife_info *ife, u32 metaid, void *metaval, | |
297 | int len, bool atomic, bool exists) | |
ef6980b6 JHS |
298 | { |
299 | struct tcf_meta_info *mi = NULL; | |
ef6980b6 JHS |
300 | int ret = 0; |
301 | ||
817e9f2c | 302 | mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL); |
5ffe57da | 303 | if (!mi) |
ef6980b6 | 304 | return -ENOMEM; |
ef6980b6 JHS |
305 | |
306 | mi->metaid = metaid; | |
307 | mi->ops = ops; | |
308 | if (len > 0) { | |
817e9f2c | 309 | ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL); |
ef6980b6 JHS |
310 | if (ret != 0) { |
311 | kfree(mi); | |
ef6980b6 JHS |
312 | return ret; |
313 | } | |
314 | } | |
315 | ||
4e407ff5 CW |
316 | if (exists) |
317 | spin_lock_bh(&ife->tcf_lock); | |
ef6980b6 | 318 | list_add_tail(&mi->metalist, &ife->metalist); |
4e407ff5 CW |
319 | if (exists) |
320 | spin_unlock_bh(&ife->tcf_lock); | |
ef6980b6 JHS |
321 | |
322 | return ret; | |
323 | } | |
324 | ||
84cb8eb2 VB |
325 | static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops, |
326 | struct tcf_ife_info *ife, u32 metaid, | |
327 | bool exists) | |
328 | { | |
329 | int ret; | |
330 | ||
331 | if (!try_module_get(ops->owner)) | |
332 | return -ENOENT; | |
333 | ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists); | |
334 | if (ret) | |
335 | module_put(ops->owner); | |
336 | return ret; | |
337 | } | |
338 | ||
5ffe57da CW |
339 | static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval, |
340 | int len, bool exists) | |
341 | { | |
342 | const struct tcf_meta_ops *ops = find_ife_oplist(metaid); | |
343 | int ret; | |
344 | ||
345 | if (!ops) | |
346 | return -ENOENT; | |
347 | ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists); | |
348 | if (ret) | |
349 | /*put back what find_ife_oplist took */ | |
350 | module_put(ops->owner); | |
351 | return ret; | |
352 | } | |
353 | ||
4e407ff5 | 354 | static int use_all_metadata(struct tcf_ife_info *ife, bool exists) |
ef6980b6 JHS |
355 | { |
356 | struct tcf_meta_ops *o; | |
357 | int rc = 0; | |
358 | int installed = 0; | |
359 | ||
8ce5be1c | 360 | read_lock(&ife_mod_lock); |
ef6980b6 | 361 | list_for_each_entry(o, &ifeoplist, list) { |
84cb8eb2 | 362 | rc = add_metainfo_and_get_ops(o, ife, o->metaid, exists); |
ef6980b6 JHS |
363 | if (rc == 0) |
364 | installed += 1; | |
365 | } | |
8ce5be1c | 366 | read_unlock(&ife_mod_lock); |
ef6980b6 JHS |
367 | |
368 | if (installed) | |
369 | return 0; | |
370 | else | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife) | |
375 | { | |
376 | struct tcf_meta_info *e; | |
377 | struct nlattr *nest; | |
378 | unsigned char *b = skb_tail_pointer(skb); | |
379 | int total_encoded = 0; | |
380 | ||
381 | /*can only happen on decode */ | |
382 | if (list_empty(&ife->metalist)) | |
383 | return 0; | |
384 | ||
ae0be8de | 385 | nest = nla_nest_start_noflag(skb, TCA_IFE_METALST); |
ef6980b6 JHS |
386 | if (!nest) |
387 | goto out_nlmsg_trim; | |
388 | ||
389 | list_for_each_entry(e, &ife->metalist, metalist) { | |
390 | if (!e->ops->get(skb, e)) | |
391 | total_encoded += 1; | |
392 | } | |
393 | ||
394 | if (!total_encoded) | |
395 | goto out_nlmsg_trim; | |
396 | ||
397 | nla_nest_end(skb, nest); | |
398 | ||
399 | return 0; | |
400 | ||
401 | out_nlmsg_trim: | |
402 | nlmsg_trim(skb, b); | |
403 | return -1; | |
404 | } | |
405 | ||
406 | /* under ife->tcf_lock */ | |
9a63b255 | 407 | static void _tcf_ife_cleanup(struct tc_action *a) |
ef6980b6 | 408 | { |
a85a970a | 409 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
410 | struct tcf_meta_info *e, *n; |
411 | ||
412 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
ef6980b6 JHS |
413 | list_del(&e->metalist); |
414 | if (e->metaval) { | |
415 | if (e->ops->release) | |
416 | e->ops->release(e); | |
417 | else | |
418 | kfree(e->metaval); | |
419 | } | |
6d784f16 | 420 | module_put(e->ops->owner); |
ef6980b6 JHS |
421 | kfree(e); |
422 | } | |
423 | } | |
424 | ||
9a63b255 | 425 | static void tcf_ife_cleanup(struct tc_action *a) |
ef6980b6 | 426 | { |
a85a970a | 427 | struct tcf_ife_info *ife = to_ife(a); |
aa9fd9a3 | 428 | struct tcf_ife_params *p; |
ef6980b6 JHS |
429 | |
430 | spin_lock_bh(&ife->tcf_lock); | |
9a63b255 | 431 | _tcf_ife_cleanup(a); |
ef6980b6 | 432 | spin_unlock_bh(&ife->tcf_lock); |
aa9fd9a3 AA |
433 | |
434 | p = rcu_dereference_protected(ife->params, 1); | |
0a889b94 DC |
435 | if (p) |
436 | kfree_rcu(p, rcu); | |
ef6980b6 JHS |
437 | } |
438 | ||
067a7cd0 | 439 | static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb, |
54d0d423 | 440 | bool exists, bool rtnl_held) |
ef6980b6 JHS |
441 | { |
442 | int len = 0; | |
443 | int rc = 0; | |
444 | int i = 0; | |
445 | void *val; | |
446 | ||
447 | for (i = 1; i < max_metacnt; i++) { | |
448 | if (tb[i]) { | |
449 | val = nla_data(tb[i]); | |
450 | len = nla_len(tb[i]); | |
451 | ||
4e407ff5 | 452 | rc = load_metaops_and_vet(i, val, len, rtnl_held); |
ef6980b6 JHS |
453 | if (rc != 0) |
454 | return rc; | |
455 | ||
5ffe57da | 456 | rc = add_metainfo(ife, i, val, len, exists); |
ef6980b6 JHS |
457 | if (rc) |
458 | return rc; | |
459 | } | |
460 | } | |
461 | ||
462 | return rc; | |
463 | } | |
464 | ||
465 | static int tcf_ife_init(struct net *net, struct nlattr *nla, | |
a85a970a | 466 | struct nlattr *est, struct tc_action **a, |
789871bb | 467 | int ovr, int bind, bool rtnl_held, |
85d0966f | 468 | struct tcf_proto *tp, struct netlink_ext_ack *extack) |
ef6980b6 JHS |
469 | { |
470 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
471 | struct nlattr *tb[TCA_IFE_MAX + 1]; | |
472 | struct nlattr *tb2[IFE_META_MAX + 1]; | |
11a94d7f | 473 | struct tcf_chain *goto_ch = NULL; |
54d0d423 | 474 | struct tcf_ife_params *p; |
ef6980b6 | 475 | struct tcf_ife_info *ife; |
b522ed6e | 476 | u16 ife_type = ETH_P_IFE; |
ef6980b6 | 477 | struct tc_ife *parm; |
ef6980b6 JHS |
478 | u8 *daddr = NULL; |
479 | u8 *saddr = NULL; | |
b2313077 WC |
480 | bool exists = false; |
481 | int ret = 0; | |
7be8ef2c | 482 | u32 index; |
ef6980b6 JHS |
483 | int err; |
484 | ||
c8ec4632 CW |
485 | if (!nla) { |
486 | NL_SET_ERR_MSG_MOD(extack, "IFE requires attributes to be passed"); | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
8cb08174 JB |
490 | err = nla_parse_nested_deprecated(tb, TCA_IFE_MAX, nla, ife_policy, |
491 | NULL); | |
ef6980b6 JHS |
492 | if (err < 0) |
493 | return err; | |
494 | ||
495 | if (!tb[TCA_IFE_PARMS]) | |
496 | return -EINVAL; | |
497 | ||
498 | parm = nla_data(tb[TCA_IFE_PARMS]); | |
499 | ||
734534e9 AA |
500 | /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because |
501 | * they cannot run as the same time. Check on all other values which | |
502 | * are not supported right now. | |
503 | */ | |
504 | if (parm->flags & ~IFE_ENCODE) | |
505 | return -EINVAL; | |
506 | ||
aa9fd9a3 AA |
507 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
508 | if (!p) | |
509 | return -ENOMEM; | |
510 | ||
7be8ef2c DL |
511 | index = parm->index; |
512 | err = tcf_idr_check_alloc(tn, &index, a, bind); | |
01e866bf VB |
513 | if (err < 0) { |
514 | kfree(p); | |
0190c1d4 | 515 | return err; |
01e866bf | 516 | } |
0190c1d4 | 517 | exists = err; |
aa9fd9a3 AA |
518 | if (exists && bind) { |
519 | kfree(p); | |
4e8c8615 | 520 | return 0; |
aa9fd9a3 | 521 | } |
4e8c8615 | 522 | |
4e8c8615 | 523 | if (!exists) { |
7be8ef2c | 524 | ret = tcf_idr_create(tn, index, est, a, &act_ife_ops, |
ced273ea | 525 | bind, true); |
aa9fd9a3 | 526 | if (ret) { |
7be8ef2c | 527 | tcf_idr_cleanup(tn, index); |
aa9fd9a3 | 528 | kfree(p); |
ef6980b6 | 529 | return ret; |
aa9fd9a3 | 530 | } |
ef6980b6 | 531 | ret = ACT_P_CREATED; |
4e8ddd7f | 532 | } else if (!ovr) { |
65a206c0 | 533 | tcf_idr_release(*a, bind); |
4e8ddd7f VB |
534 | kfree(p); |
535 | return -EEXIST; | |
ef6980b6 JHS |
536 | } |
537 | ||
a85a970a | 538 | ife = to_ife(*a); |
11a94d7f DC |
539 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
540 | if (err < 0) | |
541 | goto release_idr; | |
542 | ||
aa9fd9a3 | 543 | p->flags = parm->flags; |
ef6980b6 JHS |
544 | |
545 | if (parm->flags & IFE_ENCODE) { | |
b522ed6e AA |
546 | if (tb[TCA_IFE_TYPE]) |
547 | ife_type = nla_get_u16(tb[TCA_IFE_TYPE]); | |
ef6980b6 JHS |
548 | if (tb[TCA_IFE_DMAC]) |
549 | daddr = nla_data(tb[TCA_IFE_DMAC]); | |
550 | if (tb[TCA_IFE_SMAC]) | |
551 | saddr = nla_data(tb[TCA_IFE_SMAC]); | |
552 | } | |
553 | ||
ef6980b6 JHS |
554 | if (parm->flags & IFE_ENCODE) { |
555 | if (daddr) | |
aa9fd9a3 | 556 | ether_addr_copy(p->eth_dst, daddr); |
ef6980b6 | 557 | else |
aa9fd9a3 | 558 | eth_zero_addr(p->eth_dst); |
ef6980b6 JHS |
559 | |
560 | if (saddr) | |
aa9fd9a3 | 561 | ether_addr_copy(p->eth_src, saddr); |
ef6980b6 | 562 | else |
aa9fd9a3 | 563 | eth_zero_addr(p->eth_src); |
ef6980b6 | 564 | |
aa9fd9a3 | 565 | p->eth_type = ife_type; |
ef6980b6 JHS |
566 | } |
567 | ||
aa9fd9a3 | 568 | |
ef6980b6 JHS |
569 | if (ret == ACT_P_CREATED) |
570 | INIT_LIST_HEAD(&ife->metalist); | |
571 | ||
572 | if (tb[TCA_IFE_METALST]) { | |
8cb08174 JB |
573 | err = nla_parse_nested_deprecated(tb2, IFE_META_MAX, |
574 | tb[TCA_IFE_METALST], NULL, | |
575 | NULL); | |
11a94d7f DC |
576 | if (err) |
577 | goto metadata_parse_err; | |
54d0d423 | 578 | err = populate_metalist(ife, tb2, exists, rtnl_held); |
ef6980b6 JHS |
579 | if (err) |
580 | goto metadata_parse_err; | |
581 | ||
582 | } else { | |
583 | /* if no passed metadata allow list or passed allow-all | |
584 | * then here we process by adding as many supported metadatum | |
585 | * as we can. You better have at least one else we are | |
586 | * going to bail out | |
587 | */ | |
4e407ff5 | 588 | err = use_all_metadata(ife, exists); |
11a94d7f DC |
589 | if (err) |
590 | goto metadata_parse_err; | |
ef6980b6 JHS |
591 | } |
592 | ||
4e407ff5 CW |
593 | if (exists) |
594 | spin_lock_bh(&ife->tcf_lock); | |
54d0d423 | 595 | /* protected by tcf_lock when modifying existing action */ |
11a94d7f | 596 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
54d0d423 VB |
597 | rcu_swap_protected(ife->params, p, 1); |
598 | ||
067a7cd0 WC |
599 | if (exists) |
600 | spin_unlock_bh(&ife->tcf_lock); | |
11a94d7f DC |
601 | if (goto_ch) |
602 | tcf_chain_put_by_act(goto_ch); | |
54d0d423 VB |
603 | if (p) |
604 | kfree_rcu(p, rcu); | |
aa9fd9a3 | 605 | |
ef6980b6 | 606 | if (ret == ACT_P_CREATED) |
65a206c0 | 607 | tcf_idr_insert(tn, *a); |
ef6980b6 JHS |
608 | |
609 | return ret; | |
11a94d7f DC |
610 | metadata_parse_err: |
611 | if (goto_ch) | |
612 | tcf_chain_put_by_act(goto_ch); | |
613 | release_idr: | |
614 | kfree(p); | |
615 | tcf_idr_release(*a, bind); | |
616 | return err; | |
ef6980b6 JHS |
617 | } |
618 | ||
619 | static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind, | |
620 | int ref) | |
621 | { | |
622 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 623 | struct tcf_ife_info *ife = to_ife(a); |
54d0d423 | 624 | struct tcf_ife_params *p; |
ef6980b6 JHS |
625 | struct tc_ife opt = { |
626 | .index = ife->tcf_index, | |
036bb443 VB |
627 | .refcnt = refcount_read(&ife->tcf_refcnt) - ref, |
628 | .bindcnt = atomic_read(&ife->tcf_bindcnt) - bind, | |
ef6980b6 JHS |
629 | }; |
630 | struct tcf_t t; | |
631 | ||
54d0d423 VB |
632 | spin_lock_bh(&ife->tcf_lock); |
633 | opt.action = ife->tcf_action; | |
634 | p = rcu_dereference_protected(ife->params, | |
635 | lockdep_is_held(&ife->tcf_lock)); | |
636 | opt.flags = p->flags; | |
637 | ||
ef6980b6 JHS |
638 | if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt)) |
639 | goto nla_put_failure; | |
640 | ||
48d8ee16 | 641 | tcf_tm_dump(&t, &ife->tcf_tm); |
9854518e | 642 | if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD)) |
ef6980b6 JHS |
643 | goto nla_put_failure; |
644 | ||
aa9fd9a3 AA |
645 | if (!is_zero_ether_addr(p->eth_dst)) { |
646 | if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, p->eth_dst)) | |
ef6980b6 JHS |
647 | goto nla_put_failure; |
648 | } | |
649 | ||
aa9fd9a3 AA |
650 | if (!is_zero_ether_addr(p->eth_src)) { |
651 | if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, p->eth_src)) | |
ef6980b6 JHS |
652 | goto nla_put_failure; |
653 | } | |
654 | ||
aa9fd9a3 | 655 | if (nla_put(skb, TCA_IFE_TYPE, 2, &p->eth_type)) |
ef6980b6 JHS |
656 | goto nla_put_failure; |
657 | ||
658 | if (dump_metalist(skb, ife)) { | |
659 | /*ignore failure to dump metalist */ | |
660 | pr_info("Failed to dump metalist\n"); | |
661 | } | |
662 | ||
54d0d423 | 663 | spin_unlock_bh(&ife->tcf_lock); |
ef6980b6 JHS |
664 | return skb->len; |
665 | ||
666 | nla_put_failure: | |
54d0d423 | 667 | spin_unlock_bh(&ife->tcf_lock); |
ef6980b6 JHS |
668 | nlmsg_trim(skb, b); |
669 | return -1; | |
670 | } | |
671 | ||
4dba87b0 OG |
672 | static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife, |
673 | u16 metaid, u16 mlen, void *mdata) | |
ef6980b6 JHS |
674 | { |
675 | struct tcf_meta_info *e; | |
676 | ||
677 | /* XXX: use hash to speed up */ | |
678 | list_for_each_entry(e, &ife->metalist, metalist) { | |
679 | if (metaid == e->metaid) { | |
680 | if (e->ops) { | |
681 | /* We check for decode presence already */ | |
682 | return e->ops->decode(skb, mdata, mlen); | |
683 | } | |
684 | } | |
685 | } | |
686 | ||
f6cd1453 | 687 | return -ENOENT; |
ef6980b6 JHS |
688 | } |
689 | ||
ef6980b6 JHS |
690 | static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a, |
691 | struct tcf_result *res) | |
692 | { | |
a85a970a | 693 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 | 694 | int action = ife->tcf_action; |
295a6e06 YG |
695 | u8 *ifehdr_end; |
696 | u8 *tlv_data; | |
697 | u16 metalen; | |
ef6980b6 | 698 | |
ced273ea | 699 | bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb); |
9c4a4e48 | 700 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 | 701 | |
295a6e06 YG |
702 | if (skb_at_tc_ingress(skb)) |
703 | skb_push(skb, skb->dev->hard_header_len); | |
704 | ||
705 | tlv_data = ife_decode(skb, &metalen); | |
706 | if (unlikely(!tlv_data)) { | |
ced273ea | 707 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
708 | return TC_ACT_SHOT; |
709 | } | |
710 | ||
295a6e06 YG |
711 | ifehdr_end = tlv_data + metalen; |
712 | for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) { | |
713 | u8 *curr_data; | |
714 | u16 mtype; | |
715 | u16 dlen; | |
ef6980b6 | 716 | |
cc74eddd AA |
717 | curr_data = ife_tlv_meta_decode(tlv_data, ifehdr_end, &mtype, |
718 | &dlen, NULL); | |
719 | if (!curr_data) { | |
720 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); | |
721 | return TC_ACT_SHOT; | |
722 | } | |
ef6980b6 | 723 | |
295a6e06 | 724 | if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) { |
ef6980b6 JHS |
725 | /* abuse overlimits to count when we receive metadata |
726 | * but dont have an ops for it | |
727 | */ | |
295a6e06 YG |
728 | pr_info_ratelimited("Unknown metaid %d dlen %d\n", |
729 | mtype, dlen); | |
ced273ea | 730 | qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 | 731 | } |
295a6e06 | 732 | } |
ef6980b6 | 733 | |
295a6e06 | 734 | if (WARN_ON(tlv_data != ifehdr_end)) { |
ced273ea | 735 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
295a6e06 | 736 | return TC_ACT_SHOT; |
ef6980b6 JHS |
737 | } |
738 | ||
295a6e06 | 739 | skb->protocol = eth_type_trans(skb, skb->dev); |
ef6980b6 | 740 | skb_reset_network_header(skb); |
295a6e06 | 741 | |
ef6980b6 JHS |
742 | return action; |
743 | } | |
744 | ||
745 | /*XXX: check if we can do this at install time instead of current | |
746 | * send data path | |
747 | **/ | |
748 | static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife) | |
749 | { | |
750 | struct tcf_meta_info *e, *n; | |
751 | int tot_run_sz = 0, run_sz = 0; | |
752 | ||
753 | list_for_each_entry_safe(e, n, &ife->metalist, metalist) { | |
754 | if (e->ops->check_presence) { | |
755 | run_sz = e->ops->check_presence(skb, e); | |
756 | tot_run_sz += run_sz; | |
757 | } | |
758 | } | |
759 | ||
760 | return tot_run_sz; | |
761 | } | |
762 | ||
763 | static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a, | |
aa9fd9a3 | 764 | struct tcf_result *res, struct tcf_ife_params *p) |
ef6980b6 | 765 | { |
a85a970a | 766 | struct tcf_ife_info *ife = to_ife(a); |
ef6980b6 JHS |
767 | int action = ife->tcf_action; |
768 | struct ethhdr *oethh; /* outer ether header */ | |
ef6980b6 JHS |
769 | struct tcf_meta_info *e; |
770 | /* | |
771 | OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA | |
772 | where ORIGDATA = original ethernet header ... | |
773 | */ | |
774 | u16 metalen = ife_get_sz(skb, ife); | |
775 | int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN; | |
295a6e06 | 776 | unsigned int skboff = 0; |
ef6980b6 JHS |
777 | int new_len = skb->len + hdrm; |
778 | bool exceed_mtu = false; | |
295a6e06 YG |
779 | void *ife_meta; |
780 | int err = 0; | |
ef6980b6 | 781 | |
a5135bcf | 782 | if (!skb_at_tc_ingress(skb)) { |
ef6980b6 JHS |
783 | if (new_len > skb->dev->mtu) |
784 | exceed_mtu = true; | |
785 | } | |
786 | ||
ced273ea | 787 | bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb); |
9c4a4e48 | 788 | tcf_lastuse_update(&ife->tcf_tm); |
ef6980b6 JHS |
789 | |
790 | if (!metalen) { /* no metadata to send */ | |
791 | /* abuse overlimits to count when we allow packet | |
792 | * with no metadata | |
793 | */ | |
ced273ea | 794 | qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
795 | return action; |
796 | } | |
797 | /* could be stupid policy setup or mtu config | |
798 | * so lets be conservative.. */ | |
799 | if ((action == TC_ACT_SHOT) || exceed_mtu) { | |
ced273ea | 800 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
801 | return TC_ACT_SHOT; |
802 | } | |
803 | ||
a5135bcf | 804 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
805 | skb_push(skb, skb->dev->hard_header_len); |
806 | ||
295a6e06 | 807 | ife_meta = ife_encode(skb, metalen); |
ef6980b6 | 808 | |
ced273ea AA |
809 | spin_lock(&ife->tcf_lock); |
810 | ||
ef6980b6 JHS |
811 | /* XXX: we dont have a clever way of telling encode to |
812 | * not repeat some of the computations that are done by | |
813 | * ops->presence_check... | |
814 | */ | |
815 | list_for_each_entry(e, &ife->metalist, metalist) { | |
816 | if (e->ops->encode) { | |
295a6e06 | 817 | err = e->ops->encode(skb, (void *)(ife_meta + skboff), |
ef6980b6 JHS |
818 | e); |
819 | } | |
820 | if (err < 0) { | |
821 | /* too corrupt to keep around if overwritten */ | |
ef6980b6 | 822 | spin_unlock(&ife->tcf_lock); |
ced273ea | 823 | qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats)); |
ef6980b6 JHS |
824 | return TC_ACT_SHOT; |
825 | } | |
826 | skboff += err; | |
827 | } | |
aa9fd9a3 | 828 | spin_unlock(&ife->tcf_lock); |
295a6e06 | 829 | oethh = (struct ethhdr *)skb->data; |
ef6980b6 | 830 | |
aa9fd9a3 AA |
831 | if (!is_zero_ether_addr(p->eth_src)) |
832 | ether_addr_copy(oethh->h_source, p->eth_src); | |
833 | if (!is_zero_ether_addr(p->eth_dst)) | |
834 | ether_addr_copy(oethh->h_dest, p->eth_dst); | |
835 | oethh->h_proto = htons(p->eth_type); | |
ef6980b6 | 836 | |
a5135bcf | 837 | if (skb_at_tc_ingress(skb)) |
ef6980b6 JHS |
838 | skb_pull(skb, skb->dev->hard_header_len); |
839 | ||
ef6980b6 JHS |
840 | return action; |
841 | } | |
842 | ||
843 | static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a, | |
844 | struct tcf_result *res) | |
845 | { | |
a85a970a | 846 | struct tcf_ife_info *ife = to_ife(a); |
aa9fd9a3 AA |
847 | struct tcf_ife_params *p; |
848 | int ret; | |
849 | ||
7fd4b288 | 850 | p = rcu_dereference_bh(ife->params); |
aa9fd9a3 AA |
851 | if (p->flags & IFE_ENCODE) { |
852 | ret = tcf_ife_encode(skb, a, res, p); | |
aa9fd9a3 AA |
853 | return ret; |
854 | } | |
ef6980b6 | 855 | |
734534e9 | 856 | return tcf_ife_decode(skb, a, res); |
ef6980b6 JHS |
857 | } |
858 | ||
859 | static int tcf_ife_walker(struct net *net, struct sk_buff *skb, | |
860 | struct netlink_callback *cb, int type, | |
41780105 AA |
861 | const struct tc_action_ops *ops, |
862 | struct netlink_ext_ack *extack) | |
ef6980b6 JHS |
863 | { |
864 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
865 | ||
b3620145 | 866 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ef6980b6 JHS |
867 | } |
868 | ||
f061b48c | 869 | static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index) |
ef6980b6 JHS |
870 | { |
871 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
872 | ||
65a206c0 | 873 | return tcf_idr_search(tn, a, index); |
ef6980b6 JHS |
874 | } |
875 | ||
876 | static struct tc_action_ops act_ife_ops = { | |
877 | .kind = "ife", | |
eddd2cf1 | 878 | .id = TCA_ID_IFE, |
ef6980b6 JHS |
879 | .owner = THIS_MODULE, |
880 | .act = tcf_ife_act, | |
881 | .dump = tcf_ife_dump, | |
882 | .cleanup = tcf_ife_cleanup, | |
883 | .init = tcf_ife_init, | |
884 | .walk = tcf_ife_walker, | |
885 | .lookup = tcf_ife_search, | |
a85a970a | 886 | .size = sizeof(struct tcf_ife_info), |
ef6980b6 JHS |
887 | }; |
888 | ||
889 | static __net_init int ife_init_net(struct net *net) | |
890 | { | |
891 | struct tc_action_net *tn = net_generic(net, ife_net_id); | |
892 | ||
981471bd | 893 | return tc_action_net_init(net, tn, &act_ife_ops); |
ef6980b6 JHS |
894 | } |
895 | ||
039af9c6 | 896 | static void __net_exit ife_exit_net(struct list_head *net_list) |
ef6980b6 | 897 | { |
039af9c6 | 898 | tc_action_net_exit(net_list, ife_net_id); |
ef6980b6 JHS |
899 | } |
900 | ||
901 | static struct pernet_operations ife_net_ops = { | |
902 | .init = ife_init_net, | |
039af9c6 | 903 | .exit_batch = ife_exit_net, |
ef6980b6 JHS |
904 | .id = &ife_net_id, |
905 | .size = sizeof(struct tc_action_net), | |
906 | }; | |
907 | ||
908 | static int __init ife_init_module(void) | |
909 | { | |
910 | return tcf_register_action(&act_ife_ops, &ife_net_ops); | |
911 | } | |
912 | ||
913 | static void __exit ife_cleanup_module(void) | |
914 | { | |
915 | tcf_unregister_action(&act_ife_ops, &ife_net_ops); | |
916 | } | |
917 | ||
918 | module_init(ife_init_module); | |
919 | module_exit(ife_cleanup_module); | |
920 | ||
921 | MODULE_AUTHOR("Jamal Hadi Salim(2015)"); | |
922 | MODULE_DESCRIPTION("Inter-FE LFB action"); | |
923 | MODULE_LICENSE("GPL"); |