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misc: rtsx_usb: Use USB remote wakeup signaling for card insertion detection
[linux/fpc-iii.git] / net / sched / act_ife.c
blob30b63fa23ee28f33622c25d36aa75e27e05db5bb
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 #include <net/ife.h>
36
37 static unsigned int ife_net_id;
38 static int max_metacnt = IFE_META_MAX + 1;
39 static struct tc_action_ops act_ife_ops;
40
41 static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
42 [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)},
43 [TCA_IFE_DMAC] = { .len = ETH_ALEN},
44 [TCA_IFE_SMAC] = { .len = ETH_ALEN},
45 [TCA_IFE_TYPE] = { .type = NLA_U16},
46 };
47
48 int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi)
49 {
50 u16 edata = 0;
51
52 if (mi->metaval)
53 edata = *(u16 *)mi->metaval;
54 else if (metaval)
55 edata = metaval;
56
57 if (!edata) /* will not encode */
58 return 0;
59
60 edata = htons(edata);
61 return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata);
62 }
63 EXPORT_SYMBOL_GPL(ife_encode_meta_u16);
64
65 int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi)
66 {
67 if (mi->metaval)
68 return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval);
69 else
70 return nla_put(skb, mi->metaid, 0, NULL);
71 }
72 EXPORT_SYMBOL_GPL(ife_get_meta_u32);
73
74 int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi)
75 {
76 if (metaval || mi->metaval)
77 return 8; /* T+L+V == 2+2+4 */
78
79 return 0;
80 }
81 EXPORT_SYMBOL_GPL(ife_check_meta_u32);
82
83 int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi)
84 {
85 if (metaval || mi->metaval)
86 return 8; /* T+L+(V) == 2+2+(2+2bytepad) */
87
88 return 0;
89 }
90 EXPORT_SYMBOL_GPL(ife_check_meta_u16);
91
92 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
93 {
94 u32 edata = metaval;
95
96 if (mi->metaval)
97 edata = *(u32 *)mi->metaval;
98 else if (metaval)
99 edata = metaval;
100
101 if (!edata) /* will not encode */
102 return 0;
103
104 edata = htonl(edata);
105 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
106 }
107 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
108
109 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
110 {
111 if (mi->metaval)
112 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
113 else
114 return nla_put(skb, mi->metaid, 0, NULL);
115 }
116 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
117
118 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
119 {
120 mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
121 if (!mi->metaval)
122 return -ENOMEM;
123
124 return 0;
125 }
126 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
127
128 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
129 {
130 mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
131 if (!mi->metaval)
132 return -ENOMEM;
133
134 return 0;
135 }
136 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
137
138 void ife_release_meta_gen(struct tcf_meta_info *mi)
139 {
140 kfree(mi->metaval);
141 }
142 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
143
144 int ife_validate_meta_u32(void *val, int len)
145 {
146 if (len == sizeof(u32))
147 return 0;
148
149 return -EINVAL;
150 }
151 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
152
153 int ife_validate_meta_u16(void *val, int len)
154 {
155 /* length will not include padding */
156 if (len == sizeof(u16))
157 return 0;
158
159 return -EINVAL;
160 }
161 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
162
163 static LIST_HEAD(ifeoplist);
164 static DEFINE_RWLOCK(ife_mod_lock);
165
166 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
167 {
168 struct tcf_meta_ops *o;
169
170 read_lock(&ife_mod_lock);
171 list_for_each_entry(o, &ifeoplist, list) {
172 if (o->metaid == metaid) {
173 if (!try_module_get(o->owner))
174 o = NULL;
175 read_unlock(&ife_mod_lock);
176 return o;
177 }
178 }
179 read_unlock(&ife_mod_lock);
180
181 return NULL;
182 }
183
184 int register_ife_op(struct tcf_meta_ops *mops)
185 {
186 struct tcf_meta_ops *m;
187
188 if (!mops->metaid || !mops->metatype || !mops->name ||
189 !mops->check_presence || !mops->encode || !mops->decode ||
190 !mops->get || !mops->alloc)
191 return -EINVAL;
192
193 write_lock(&ife_mod_lock);
194
195 list_for_each_entry(m, &ifeoplist, list) {
196 if (m->metaid == mops->metaid ||
197 (strcmp(mops->name, m->name) == 0)) {
198 write_unlock(&ife_mod_lock);
199 return -EEXIST;
200 }
201 }
202
203 if (!mops->release)
204 mops->release = ife_release_meta_gen;
205
206 list_add_tail(&mops->list, &ifeoplist);
207 write_unlock(&ife_mod_lock);
208 return 0;
209 }
210 EXPORT_SYMBOL_GPL(unregister_ife_op);
211
212 int unregister_ife_op(struct tcf_meta_ops *mops)
213 {
214 struct tcf_meta_ops *m;
215 int err = -ENOENT;
216
217 write_lock(&ife_mod_lock);
218 list_for_each_entry(m, &ifeoplist, list) {
219 if (m->metaid == mops->metaid) {
220 list_del(&mops->list);
221 err = 0;
222 break;
223 }
224 }
225 write_unlock(&ife_mod_lock);
226
227 return err;
228 }
229 EXPORT_SYMBOL_GPL(register_ife_op);
230
231 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
232 {
233 int ret = 0;
234 /* XXX: unfortunately cant use nla_policy at this point
235 * because a length of 0 is valid in the case of
236 * "allow". "use" semantics do enforce for proper
237 * length and i couldve use nla_policy but it makes it hard
238 * to use it just for that..
239 */
240 if (ops->validate)
241 return ops->validate(val, len);
242
243 if (ops->metatype == NLA_U32)
244 ret = ife_validate_meta_u32(val, len);
245 else if (ops->metatype == NLA_U16)
246 ret = ife_validate_meta_u16(val, len);
247
248 return ret;
249 }
250
251 #ifdef CONFIG_MODULES
252 static const char *ife_meta_id2name(u32 metaid)
253 {
254 switch (metaid) {
255 case IFE_META_SKBMARK:
256 return "skbmark";
257 case IFE_META_PRIO:
258 return "skbprio";
259 case IFE_META_TCINDEX:
260 return "tcindex";
261 default:
262 return "unknown";
263 }
264 }
265 #endif
266
267 /* called when adding new meta information
268 */
269 static int load_metaops_and_vet(u32 metaid, void *val, int len, bool rtnl_held)
270 {
271 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
272 int ret = 0;
273
274 if (!ops) {
275 ret = -ENOENT;
276 #ifdef CONFIG_MODULES
277 if (rtnl_held)
278 rtnl_unlock();
279 request_module("ife-meta-%s", ife_meta_id2name(metaid));
280 if (rtnl_held)
281 rtnl_lock();
282 ops = find_ife_oplist(metaid);
283 #endif
284 }
285
286 if (ops) {
287 ret = 0;
288 if (len)
289 ret = ife_validate_metatype(ops, val, len);
290
291 module_put(ops->owner);
292 }
293
294 return ret;
295 }
296
297 /* called when adding new meta information
298 */
299 static int __add_metainfo(const struct tcf_meta_ops *ops,
300 struct tcf_ife_info *ife, u32 metaid, void *metaval,
301 int len, bool atomic, bool exists)
302 {
303 struct tcf_meta_info *mi = NULL;
304 int ret = 0;
305
306 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
307 if (!mi)
308 return -ENOMEM;
309
310 mi->metaid = metaid;
311 mi->ops = ops;
312 if (len > 0) {
313 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
314 if (ret != 0) {
315 kfree(mi);
316 return ret;
317 }
318 }
319
320 if (exists)
321 spin_lock_bh(&ife->tcf_lock);
322 list_add_tail(&mi->metalist, &ife->metalist);
323 if (exists)
324 spin_unlock_bh(&ife->tcf_lock);
325
326 return ret;
327 }
328
329 static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops,
330 struct tcf_ife_info *ife, u32 metaid,
331 bool exists)
332 {
333 int ret;
334
335 if (!try_module_get(ops->owner))
336 return -ENOENT;
337 ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists);
338 if (ret)
339 module_put(ops->owner);
340 return ret;
341 }
342
343 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
344 int len, bool exists)
345 {
346 const struct tcf_meta_ops *ops = find_ife_oplist(metaid);
347 int ret;
348
349 if (!ops)
350 return -ENOENT;
351 ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists);
352 if (ret)
353 /*put back what find_ife_oplist took */
354 module_put(ops->owner);
355 return ret;
356 }
357
358 static int use_all_metadata(struct tcf_ife_info *ife, bool exists)
359 {
360 struct tcf_meta_ops *o;
361 int rc = 0;
362 int installed = 0;
363
364 read_lock(&ife_mod_lock);
365 list_for_each_entry(o, &ifeoplist, list) {
366 rc = add_metainfo_and_get_ops(o, ife, o->metaid, exists);
367 if (rc == 0)
368 installed += 1;
369 }
370 read_unlock(&ife_mod_lock);
371
372 if (installed)
373 return 0;
374 else
375 return -EINVAL;
376 }
377
378 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
379 {
380 struct tcf_meta_info *e;
381 struct nlattr *nest;
382 unsigned char *b = skb_tail_pointer(skb);
383 int total_encoded = 0;
384
385 /*can only happen on decode */
386 if (list_empty(&ife->metalist))
387 return 0;
388
389 nest = nla_nest_start(skb, TCA_IFE_METALST);
390 if (!nest)
391 goto out_nlmsg_trim;
392
393 list_for_each_entry(e, &ife->metalist, metalist) {
394 if (!e->ops->get(skb, e))
395 total_encoded += 1;
396 }
397
398 if (!total_encoded)
399 goto out_nlmsg_trim;
400
401 nla_nest_end(skb, nest);
402
403 return 0;
404
405 out_nlmsg_trim:
406 nlmsg_trim(skb, b);
407 return -1;
408 }
409
410 /* under ife->tcf_lock */
411 static void _tcf_ife_cleanup(struct tc_action *a)
412 {
413 struct tcf_ife_info *ife = to_ife(a);
414 struct tcf_meta_info *e, *n;
415
416 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
417 list_del(&e->metalist);
418 if (e->metaval) {
419 if (e->ops->release)
420 e->ops->release(e);
421 else
422 kfree(e->metaval);
423 }
424 module_put(e->ops->owner);
425 kfree(e);
426 }
427 }
428
429 static void tcf_ife_cleanup(struct tc_action *a)
430 {
431 struct tcf_ife_info *ife = to_ife(a);
432 struct tcf_ife_params *p;
433
434 spin_lock_bh(&ife->tcf_lock);
435 _tcf_ife_cleanup(a);
436 spin_unlock_bh(&ife->tcf_lock);
437
438 p = rcu_dereference_protected(ife->params, 1);
439 if (p)
440 kfree_rcu(p, rcu);
441 }
442
443 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
444 bool exists, bool rtnl_held)
445 {
446 int len = 0;
447 int rc = 0;
448 int i = 0;
449 void *val;
450
451 for (i = 1; i < max_metacnt; i++) {
452 if (tb[i]) {
453 val = nla_data(tb[i]);
454 len = nla_len(tb[i]);
455
456 rc = load_metaops_and_vet(i, val, len, rtnl_held);
457 if (rc != 0)
458 return rc;
459
460 rc = add_metainfo(ife, i, val, len, exists);
461 if (rc)
462 return rc;
463 }
464 }
465
466 return rc;
467 }
468
469 static int tcf_ife_init(struct net *net, struct nlattr *nla,
470 struct nlattr *est, struct tc_action **a,
471 int ovr, int bind, bool rtnl_held,
472 struct netlink_ext_ack *extack)
473 {
474 struct tc_action_net *tn = net_generic(net, ife_net_id);
475 struct nlattr *tb[TCA_IFE_MAX + 1];
476 struct nlattr *tb2[IFE_META_MAX + 1];
477 struct tcf_ife_params *p;
478 struct tcf_ife_info *ife;
479 u16 ife_type = ETH_P_IFE;
480 struct tc_ife *parm;
481 u8 *daddr = NULL;
482 u8 *saddr = NULL;
483 bool exists = false;
484 int ret = 0;
485 int err;
486
487 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL);
488 if (err < 0)
489 return err;
490
491 if (!tb[TCA_IFE_PARMS])
492 return -EINVAL;
493
494 parm = nla_data(tb[TCA_IFE_PARMS]);
495
496 /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because
497 * they cannot run as the same time. Check on all other values which
498 * are not supported right now.
499 */
500 if (parm->flags & ~IFE_ENCODE)
501 return -EINVAL;
502
503 p = kzalloc(sizeof(*p), GFP_KERNEL);
504 if (!p)
505 return -ENOMEM;
506
507 err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
508 if (err < 0) {
509 kfree(p);
510 return err;
511 }
512 exists = err;
513 if (exists && bind) {
514 kfree(p);
515 return 0;
516 }
517
518 if (!exists) {
519 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops,
520 bind, true);
521 if (ret) {
522 tcf_idr_cleanup(tn, parm->index);
523 kfree(p);
524 return ret;
525 }
526 ret = ACT_P_CREATED;
527 } else if (!ovr) {
528 tcf_idr_release(*a, bind);
529 kfree(p);
530 return -EEXIST;
531 }
532
533 ife = to_ife(*a);
534 p->flags = parm->flags;
535
536 if (parm->flags & IFE_ENCODE) {
537 if (tb[TCA_IFE_TYPE])
538 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
539 if (tb[TCA_IFE_DMAC])
540 daddr = nla_data(tb[TCA_IFE_DMAC]);
541 if (tb[TCA_IFE_SMAC])
542 saddr = nla_data(tb[TCA_IFE_SMAC]);
543 }
544
545 if (parm->flags & IFE_ENCODE) {
546 if (daddr)
547 ether_addr_copy(p->eth_dst, daddr);
548 else
549 eth_zero_addr(p->eth_dst);
550
551 if (saddr)
552 ether_addr_copy(p->eth_src, saddr);
553 else
554 eth_zero_addr(p->eth_src);
555
556 p->eth_type = ife_type;
557 }
558
559
560 if (ret == ACT_P_CREATED)
561 INIT_LIST_HEAD(&ife->metalist);
562
563 if (tb[TCA_IFE_METALST]) {
564 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
565 NULL, NULL);
566 if (err) {
567 metadata_parse_err:
568 tcf_idr_release(*a, bind);
569 kfree(p);
570 return err;
571 }
572
573 err = populate_metalist(ife, tb2, exists, rtnl_held);
574 if (err)
575 goto metadata_parse_err;
576
577 } else {
578 /* if no passed metadata allow list or passed allow-all
579 * then here we process by adding as many supported metadatum
580 * as we can. You better have at least one else we are
581 * going to bail out
582 */
583 err = use_all_metadata(ife, exists);
584 if (err) {
585 tcf_idr_release(*a, bind);
586 kfree(p);
587 return err;
588 }
589 }
590
591 if (exists)
592 spin_lock_bh(&ife->tcf_lock);
593 ife->tcf_action = parm->action;
594 /* protected by tcf_lock when modifying existing action */
595 rcu_swap_protected(ife->params, p, 1);
596
597 if (exists)
598 spin_unlock_bh(&ife->tcf_lock);
599 if (p)
600 kfree_rcu(p, rcu);
601
602 if (ret == ACT_P_CREATED)
603 tcf_idr_insert(tn, *a);
604
605 return ret;
606 }
607
608 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
609 int ref)
610 {
611 unsigned char *b = skb_tail_pointer(skb);
612 struct tcf_ife_info *ife = to_ife(a);
613 struct tcf_ife_params *p;
614 struct tc_ife opt = {
615 .index = ife->tcf_index,
616 .refcnt = refcount_read(&ife->tcf_refcnt) - ref,
617 .bindcnt = atomic_read(&ife->tcf_bindcnt) - bind,
618 };
619 struct tcf_t t;
620
621 spin_lock_bh(&ife->tcf_lock);
622 opt.action = ife->tcf_action;
623 p = rcu_dereference_protected(ife->params,
624 lockdep_is_held(&ife->tcf_lock));
625 opt.flags = p->flags;
626
627 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
628 goto nla_put_failure;
629
630 tcf_tm_dump(&t, &ife->tcf_tm);
631 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
632 goto nla_put_failure;
633
634 if (!is_zero_ether_addr(p->eth_dst)) {
635 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, p->eth_dst))
636 goto nla_put_failure;
637 }
638
639 if (!is_zero_ether_addr(p->eth_src)) {
640 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, p->eth_src))
641 goto nla_put_failure;
642 }
643
644 if (nla_put(skb, TCA_IFE_TYPE, 2, &p->eth_type))
645 goto nla_put_failure;
646
647 if (dump_metalist(skb, ife)) {
648 /*ignore failure to dump metalist */
649 pr_info("Failed to dump metalist\n");
650 }
651
652 spin_unlock_bh(&ife->tcf_lock);
653 return skb->len;
654
655 nla_put_failure:
656 spin_unlock_bh(&ife->tcf_lock);
657 nlmsg_trim(skb, b);
658 return -1;
659 }
660
661 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
662 u16 metaid, u16 mlen, void *mdata)
663 {
664 struct tcf_meta_info *e;
665
666 /* XXX: use hash to speed up */
667 list_for_each_entry(e, &ife->metalist, metalist) {
668 if (metaid == e->metaid) {
669 if (e->ops) {
670 /* We check for decode presence already */
671 return e->ops->decode(skb, mdata, mlen);
672 }
673 }
674 }
675
676 return -ENOENT;
677 }
678
679 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
680 struct tcf_result *res)
681 {
682 struct tcf_ife_info *ife = to_ife(a);
683 int action = ife->tcf_action;
684 u8 *ifehdr_end;
685 u8 *tlv_data;
686 u16 metalen;
687
688 bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
689 tcf_lastuse_update(&ife->tcf_tm);
690
691 if (skb_at_tc_ingress(skb))
692 skb_push(skb, skb->dev->hard_header_len);
693
694 tlv_data = ife_decode(skb, &metalen);
695 if (unlikely(!tlv_data)) {
696 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
697 return TC_ACT_SHOT;
698 }
699
700 ifehdr_end = tlv_data + metalen;
701 for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) {
702 u8 *curr_data;
703 u16 mtype;
704 u16 dlen;
705
706 curr_data = ife_tlv_meta_decode(tlv_data, ifehdr_end, &mtype,
707 &dlen, NULL);
708 if (!curr_data) {
709 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
710 return TC_ACT_SHOT;
711 }
712
713 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) {
714 /* abuse overlimits to count when we receive metadata
715 * but dont have an ops for it
716 */
717 pr_info_ratelimited("Unknown metaid %d dlen %d\n",
718 mtype, dlen);
719 qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
720 }
721 }
722
723 if (WARN_ON(tlv_data != ifehdr_end)) {
724 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
725 return TC_ACT_SHOT;
726 }
727
728 skb->protocol = eth_type_trans(skb, skb->dev);
729 skb_reset_network_header(skb);
730
731 return action;
732 }
733
734 /*XXX: check if we can do this at install time instead of current
735 * send data path
736 **/
737 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
738 {
739 struct tcf_meta_info *e, *n;
740 int tot_run_sz = 0, run_sz = 0;
741
742 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
743 if (e->ops->check_presence) {
744 run_sz = e->ops->check_presence(skb, e);
745 tot_run_sz += run_sz;
746 }
747 }
748
749 return tot_run_sz;
750 }
751
752 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
753 struct tcf_result *res, struct tcf_ife_params *p)
754 {
755 struct tcf_ife_info *ife = to_ife(a);
756 int action = ife->tcf_action;
757 struct ethhdr *oethh; /* outer ether header */
758 struct tcf_meta_info *e;
759 /*
760 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
761 where ORIGDATA = original ethernet header ...
762 */
763 u16 metalen = ife_get_sz(skb, ife);
764 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
765 unsigned int skboff = 0;
766 int new_len = skb->len + hdrm;
767 bool exceed_mtu = false;
768 void *ife_meta;
769 int err = 0;
770
771 if (!skb_at_tc_ingress(skb)) {
772 if (new_len > skb->dev->mtu)
773 exceed_mtu = true;
774 }
775
776 bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
777 tcf_lastuse_update(&ife->tcf_tm);
778
779 if (!metalen) { /* no metadata to send */
780 /* abuse overlimits to count when we allow packet
781 * with no metadata
782 */
783 qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
784 return action;
785 }
786 /* could be stupid policy setup or mtu config
787 * so lets be conservative.. */
788 if ((action == TC_ACT_SHOT) || exceed_mtu) {
789 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
790 return TC_ACT_SHOT;
791 }
792
793 if (skb_at_tc_ingress(skb))
794 skb_push(skb, skb->dev->hard_header_len);
795
796 ife_meta = ife_encode(skb, metalen);
797
798 spin_lock(&ife->tcf_lock);
799
800 /* XXX: we dont have a clever way of telling encode to
801 * not repeat some of the computations that are done by
802 * ops->presence_check...
803 */
804 list_for_each_entry(e, &ife->metalist, metalist) {
805 if (e->ops->encode) {
806 err = e->ops->encode(skb, (void *)(ife_meta + skboff),
807 e);
808 }
809 if (err < 0) {
810 /* too corrupt to keep around if overwritten */
811 spin_unlock(&ife->tcf_lock);
812 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
813 return TC_ACT_SHOT;
814 }
815 skboff += err;
816 }
817 spin_unlock(&ife->tcf_lock);
818 oethh = (struct ethhdr *)skb->data;
819
820 if (!is_zero_ether_addr(p->eth_src))
821 ether_addr_copy(oethh->h_source, p->eth_src);
822 if (!is_zero_ether_addr(p->eth_dst))
823 ether_addr_copy(oethh->h_dest, p->eth_dst);
824 oethh->h_proto = htons(p->eth_type);
825
826 if (skb_at_tc_ingress(skb))
827 skb_pull(skb, skb->dev->hard_header_len);
828
829 return action;
830 }
831
832 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
833 struct tcf_result *res)
834 {
835 struct tcf_ife_info *ife = to_ife(a);
836 struct tcf_ife_params *p;
837 int ret;
838
839 p = rcu_dereference_bh(ife->params);
840 if (p->flags & IFE_ENCODE) {
841 ret = tcf_ife_encode(skb, a, res, p);
842 return ret;
843 }
844
845 return tcf_ife_decode(skb, a, res);
846 }
847
848 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
849 struct netlink_callback *cb, int type,
850 const struct tc_action_ops *ops,
851 struct netlink_ext_ack *extack)
852 {
853 struct tc_action_net *tn = net_generic(net, ife_net_id);
854
855 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
856 }
857
858 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
859 {
860 struct tc_action_net *tn = net_generic(net, ife_net_id);
861
862 return tcf_idr_search(tn, a, index);
863 }
864
865 static struct tc_action_ops act_ife_ops = {
866 .kind = "ife",
867 .type = TCA_ACT_IFE,
868 .owner = THIS_MODULE,
869 .act = tcf_ife_act,
870 .dump = tcf_ife_dump,
871 .cleanup = tcf_ife_cleanup,
872 .init = tcf_ife_init,
873 .walk = tcf_ife_walker,
874 .lookup = tcf_ife_search,
875 .size = sizeof(struct tcf_ife_info),
876 };
877
878 static __net_init int ife_init_net(struct net *net)
879 {
880 struct tc_action_net *tn = net_generic(net, ife_net_id);
881
882 return tc_action_net_init(tn, &act_ife_ops);
883 }
884
885 static void __net_exit ife_exit_net(struct list_head *net_list)
886 {
887 tc_action_net_exit(net_list, ife_net_id);
888 }
889
890 static struct pernet_operations ife_net_ops = {
891 .init = ife_init_net,
892 .exit_batch = ife_exit_net,
893 .id = &ife_net_id,
894 .size = sizeof(struct tc_action_net),
895 };
896
897 static int __init ife_init_module(void)
898 {
899 return tcf_register_action(&act_ife_ops, &ife_net_ops);
900 }
901
902 static void __exit ife_cleanup_module(void)
903 {
904 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
905 }
906
907 module_init(ife_init_module);
908 module_exit(ife_cleanup_module);
909
910 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
911 MODULE_DESCRIPTION("Inter-FE LFB action");
912 MODULE_LICENSE("GPL");
Linux with added FPC-III support