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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / net / sched / act_ife.c
blob31de26c990231ff550f5937845e3ba080dde2bab
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 /* called when adding new meta information
252 */
253 static int load_metaops_and_vet(u32 metaid, void *val, int len)
254 {
255 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
256 int ret = 0;
257
258 if (!ops) {
259 ret = -ENOENT;
260 #ifdef CONFIG_MODULES
261 rtnl_unlock();
262 request_module("ifemeta%u", metaid);
263 rtnl_lock();
264 ops = find_ife_oplist(metaid);
265 #endif
266 }
267
268 if (ops) {
269 ret = 0;
270 if (len)
271 ret = ife_validate_metatype(ops, val, len);
272
273 module_put(ops->owner);
274 }
275
276 return ret;
277 }
278
279 /* called when adding new meta information
280 */
281 static int __add_metainfo(const struct tcf_meta_ops *ops,
282 struct tcf_ife_info *ife, u32 metaid, void *metaval,
283 int len, bool atomic, bool exists)
284 {
285 struct tcf_meta_info *mi = NULL;
286 int ret = 0;
287
288 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
289 if (!mi)
290 return -ENOMEM;
291
292 mi->metaid = metaid;
293 mi->ops = ops;
294 if (len > 0) {
295 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
296 if (ret != 0) {
297 kfree(mi);
298 return ret;
299 }
300 }
301
302 if (exists)
303 spin_lock_bh(&ife->tcf_lock);
304 list_add_tail(&mi->metalist, &ife->metalist);
305 if (exists)
306 spin_unlock_bh(&ife->tcf_lock);
307
308 return ret;
309 }
310
311 static int add_metainfo_and_get_ops(const struct tcf_meta_ops *ops,
312 struct tcf_ife_info *ife, u32 metaid,
313 bool exists)
314 {
315 int ret;
316
317 if (!try_module_get(ops->owner))
318 return -ENOENT;
319 ret = __add_metainfo(ops, ife, metaid, NULL, 0, true, exists);
320 if (ret)
321 module_put(ops->owner);
322 return ret;
323 }
324
325 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
326 int len, bool exists)
327 {
328 const struct tcf_meta_ops *ops = find_ife_oplist(metaid);
329 int ret;
330
331 if (!ops)
332 return -ENOENT;
333 ret = __add_metainfo(ops, ife, metaid, metaval, len, false, exists);
334 if (ret)
335 /*put back what find_ife_oplist took */
336 module_put(ops->owner);
337 return ret;
338 }
339
340 static int use_all_metadata(struct tcf_ife_info *ife, bool exists)
341 {
342 struct tcf_meta_ops *o;
343 int rc = 0;
344 int installed = 0;
345
346 read_lock(&ife_mod_lock);
347 list_for_each_entry(o, &ifeoplist, list) {
348 rc = add_metainfo_and_get_ops(o, ife, o->metaid, exists);
349 if (rc == 0)
350 installed += 1;
351 }
352 read_unlock(&ife_mod_lock);
353
354 if (installed)
355 return 0;
356 else
357 return -EINVAL;
358 }
359
360 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
361 {
362 struct tcf_meta_info *e;
363 struct nlattr *nest;
364 unsigned char *b = skb_tail_pointer(skb);
365 int total_encoded = 0;
366
367 /*can only happen on decode */
368 if (list_empty(&ife->metalist))
369 return 0;
370
371 nest = nla_nest_start(skb, TCA_IFE_METALST);
372 if (!nest)
373 goto out_nlmsg_trim;
374
375 list_for_each_entry(e, &ife->metalist, metalist) {
376 if (!e->ops->get(skb, e))
377 total_encoded += 1;
378 }
379
380 if (!total_encoded)
381 goto out_nlmsg_trim;
382
383 nla_nest_end(skb, nest);
384
385 return 0;
386
387 out_nlmsg_trim:
388 nlmsg_trim(skb, b);
389 return -1;
390 }
391
392 /* under ife->tcf_lock */
393 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
394 {
395 struct tcf_ife_info *ife = to_ife(a);
396 struct tcf_meta_info *e, *n;
397
398 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
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 module_put(e->ops->owner);
407 kfree(e);
408 }
409 }
410
411 static void tcf_ife_cleanup(struct tc_action *a, int bind)
412 {
413 struct tcf_ife_info *ife = to_ife(a);
414
415 spin_lock_bh(&ife->tcf_lock);
416 _tcf_ife_cleanup(a, bind);
417 spin_unlock_bh(&ife->tcf_lock);
418 }
419
420 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
421 bool exists)
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
433 rc = load_metaops_and_vet(i, val, len);
434 if (rc != 0)
435 return rc;
436
437 rc = add_metainfo(ife, i, val, len, exists);
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,
447 struct nlattr *est, struct tc_action **a,
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 u16 ife_type = ETH_P_IFE;
455 struct tc_ife *parm;
456 u8 *daddr = NULL;
457 u8 *saddr = NULL;
458 bool exists = false;
459 int ret = 0;
460 int err;
461
462 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL);
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
471 exists = tcf_idr_check(tn, parm->index, a, bind);
472 if (exists && bind)
473 return 0;
474
475 if (!exists) {
476 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops,
477 bind, false);
478 if (ret)
479 return ret;
480 ret = ACT_P_CREATED;
481 } else {
482 tcf_idr_release(*a, bind);
483 if (!ovr)
484 return -EEXIST;
485 }
486
487 ife = to_ife(*a);
488 ife->flags = parm->flags;
489
490 if (parm->flags & IFE_ENCODE) {
491 if (tb[TCA_IFE_TYPE])
492 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
493 if (tb[TCA_IFE_DMAC])
494 daddr = nla_data(tb[TCA_IFE_DMAC]);
495 if (tb[TCA_IFE_SMAC])
496 saddr = nla_data(tb[TCA_IFE_SMAC]);
497 }
498
499 if (exists)
500 spin_lock_bh(&ife->tcf_lock);
501 ife->tcf_action = parm->action;
502 if (exists)
503 spin_unlock_bh(&ife->tcf_lock);
504
505 if (parm->flags & IFE_ENCODE) {
506 if (daddr)
507 ether_addr_copy(ife->eth_dst, daddr);
508 else
509 eth_zero_addr(ife->eth_dst);
510
511 if (saddr)
512 ether_addr_copy(ife->eth_src, saddr);
513 else
514 eth_zero_addr(ife->eth_src);
515
516 ife->eth_type = ife_type;
517 }
518
519 if (ret == ACT_P_CREATED)
520 INIT_LIST_HEAD(&ife->metalist);
521
522 if (tb[TCA_IFE_METALST]) {
523 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
524 NULL, NULL);
525 if (err) {
526 metadata_parse_err:
527 if (exists)
528 tcf_idr_release(*a, bind);
529 if (ret == ACT_P_CREATED)
530 _tcf_ife_cleanup(*a, bind);
531 return err;
532 }
533
534 err = populate_metalist(ife, tb2, exists);
535 if (err)
536 goto metadata_parse_err;
537
538 } else {
539 /* if no passed metadata allow list or passed allow-all
540 * then here we process by adding as many supported metadatum
541 * as we can. You better have at least one else we are
542 * going to bail out
543 */
544 err = use_all_metadata(ife, exists);
545 if (err) {
546 if (ret == ACT_P_CREATED)
547 _tcf_ife_cleanup(*a, bind);
548 return err;
549 }
550 }
551
552 if (ret == ACT_P_CREATED)
553 tcf_idr_insert(tn, *a);
554
555 return ret;
556 }
557
558 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
559 int ref)
560 {
561 unsigned char *b = skb_tail_pointer(skb);
562 struct tcf_ife_info *ife = to_ife(a);
563 struct tc_ife opt = {
564 .index = ife->tcf_index,
565 .refcnt = ife->tcf_refcnt - ref,
566 .bindcnt = ife->tcf_bindcnt - bind,
567 .action = ife->tcf_action,
568 .flags = ife->flags,
569 };
570 struct tcf_t t;
571
572 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
573 goto nla_put_failure;
574
575 tcf_tm_dump(&t, &ife->tcf_tm);
576 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
577 goto nla_put_failure;
578
579 if (!is_zero_ether_addr(ife->eth_dst)) {
580 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
581 goto nla_put_failure;
582 }
583
584 if (!is_zero_ether_addr(ife->eth_src)) {
585 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
586 goto nla_put_failure;
587 }
588
589 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
590 goto nla_put_failure;
591
592 if (dump_metalist(skb, ife)) {
593 /*ignore failure to dump metalist */
594 pr_info("Failed to dump metalist\n");
595 }
596
597 return skb->len;
598
599 nla_put_failure:
600 nlmsg_trim(skb, b);
601 return -1;
602 }
603
604 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
605 u16 metaid, u16 mlen, void *mdata)
606 {
607 struct tcf_meta_info *e;
608
609 /* XXX: use hash to speed up */
610 list_for_each_entry(e, &ife->metalist, metalist) {
611 if (metaid == e->metaid) {
612 if (e->ops) {
613 /* We check for decode presence already */
614 return e->ops->decode(skb, mdata, mlen);
615 }
616 }
617 }
618
619 return -ENOENT;
620 }
621
622 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
623 struct tcf_result *res)
624 {
625 struct tcf_ife_info *ife = to_ife(a);
626 int action = ife->tcf_action;
627 u8 *ifehdr_end;
628 u8 *tlv_data;
629 u16 metalen;
630
631 spin_lock(&ife->tcf_lock);
632 bstats_update(&ife->tcf_bstats, skb);
633 tcf_lastuse_update(&ife->tcf_tm);
634 spin_unlock(&ife->tcf_lock);
635
636 if (skb_at_tc_ingress(skb))
637 skb_push(skb, skb->dev->hard_header_len);
638
639 tlv_data = ife_decode(skb, &metalen);
640 if (unlikely(!tlv_data)) {
641 spin_lock(&ife->tcf_lock);
642 ife->tcf_qstats.drops++;
643 spin_unlock(&ife->tcf_lock);
644 return TC_ACT_SHOT;
645 }
646
647 ifehdr_end = tlv_data + metalen;
648 for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) {
649 u8 *curr_data;
650 u16 mtype;
651 u16 dlen;
652
653 curr_data = ife_tlv_meta_decode(tlv_data, ifehdr_end, &mtype,
654 &dlen, NULL);
655 if (!curr_data) {
656 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
657 return TC_ACT_SHOT;
658 }
659
660 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) {
661 /* abuse overlimits to count when we receive metadata
662 * but dont have an ops for it
663 */
664 pr_info_ratelimited("Unknown metaid %d dlen %d\n",
665 mtype, dlen);
666 ife->tcf_qstats.overlimits++;
667 }
668 }
669
670 if (WARN_ON(tlv_data != ifehdr_end)) {
671 spin_lock(&ife->tcf_lock);
672 ife->tcf_qstats.drops++;
673 spin_unlock(&ife->tcf_lock);
674 return TC_ACT_SHOT;
675 }
676
677 skb->protocol = eth_type_trans(skb, skb->dev);
678 skb_reset_network_header(skb);
679
680 return action;
681 }
682
683 /*XXX: check if we can do this at install time instead of current
684 * send data path
685 **/
686 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
687 {
688 struct tcf_meta_info *e, *n;
689 int tot_run_sz = 0, run_sz = 0;
690
691 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
692 if (e->ops->check_presence) {
693 run_sz = e->ops->check_presence(skb, e);
694 tot_run_sz += run_sz;
695 }
696 }
697
698 return tot_run_sz;
699 }
700
701 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
702 struct tcf_result *res)
703 {
704 struct tcf_ife_info *ife = to_ife(a);
705 int action = ife->tcf_action;
706 struct ethhdr *oethh; /* outer ether header */
707 struct tcf_meta_info *e;
708 /*
709 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
710 where ORIGDATA = original ethernet header ...
711 */
712 u16 metalen = ife_get_sz(skb, ife);
713 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
714 unsigned int skboff = 0;
715 int new_len = skb->len + hdrm;
716 bool exceed_mtu = false;
717 void *ife_meta;
718 int err = 0;
719
720 if (!skb_at_tc_ingress(skb)) {
721 if (new_len > skb->dev->mtu)
722 exceed_mtu = true;
723 }
724
725 spin_lock(&ife->tcf_lock);
726 bstats_update(&ife->tcf_bstats, skb);
727 tcf_lastuse_update(&ife->tcf_tm);
728
729 if (!metalen) { /* no metadata to send */
730 /* abuse overlimits to count when we allow packet
731 * with no metadata
732 */
733 ife->tcf_qstats.overlimits++;
734 spin_unlock(&ife->tcf_lock);
735 return action;
736 }
737 /* could be stupid policy setup or mtu config
738 * so lets be conservative.. */
739 if ((action == TC_ACT_SHOT) || exceed_mtu) {
740 ife->tcf_qstats.drops++;
741 spin_unlock(&ife->tcf_lock);
742 return TC_ACT_SHOT;
743 }
744
745 if (skb_at_tc_ingress(skb))
746 skb_push(skb, skb->dev->hard_header_len);
747
748 ife_meta = ife_encode(skb, metalen);
749
750 /* XXX: we dont have a clever way of telling encode to
751 * not repeat some of the computations that are done by
752 * ops->presence_check...
753 */
754 list_for_each_entry(e, &ife->metalist, metalist) {
755 if (e->ops->encode) {
756 err = e->ops->encode(skb, (void *)(ife_meta + skboff),
757 e);
758 }
759 if (err < 0) {
760 /* too corrupt to keep around if overwritten */
761 ife->tcf_qstats.drops++;
762 spin_unlock(&ife->tcf_lock);
763 return TC_ACT_SHOT;
764 }
765 skboff += err;
766 }
767 oethh = (struct ethhdr *)skb->data;
768
769 if (!is_zero_ether_addr(ife->eth_src))
770 ether_addr_copy(oethh->h_source, ife->eth_src);
771 if (!is_zero_ether_addr(ife->eth_dst))
772 ether_addr_copy(oethh->h_dest, ife->eth_dst);
773 oethh->h_proto = htons(ife->eth_type);
774
775 if (skb_at_tc_ingress(skb))
776 skb_pull(skb, skb->dev->hard_header_len);
777
778 spin_unlock(&ife->tcf_lock);
779
780 return action;
781 }
782
783 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
784 struct tcf_result *res)
785 {
786 struct tcf_ife_info *ife = to_ife(a);
787
788 if (ife->flags & IFE_ENCODE)
789 return tcf_ife_encode(skb, a, res);
790
791 if (!(ife->flags & IFE_ENCODE))
792 return tcf_ife_decode(skb, a, res);
793
794 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
795 spin_lock(&ife->tcf_lock);
796 bstats_update(&ife->tcf_bstats, skb);
797 tcf_lastuse_update(&ife->tcf_tm);
798 ife->tcf_qstats.drops++;
799 spin_unlock(&ife->tcf_lock);
800
801 return TC_ACT_SHOT;
802 }
803
804 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
805 struct netlink_callback *cb, int type,
806 const struct tc_action_ops *ops)
807 {
808 struct tc_action_net *tn = net_generic(net, ife_net_id);
809
810 return tcf_generic_walker(tn, skb, cb, type, ops);
811 }
812
813 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
814 {
815 struct tc_action_net *tn = net_generic(net, ife_net_id);
816
817 return tcf_idr_search(tn, a, index);
818 }
819
820 static struct tc_action_ops act_ife_ops = {
821 .kind = "ife",
822 .type = TCA_ACT_IFE,
823 .owner = THIS_MODULE,
824 .act = tcf_ife_act,
825 .dump = tcf_ife_dump,
826 .cleanup = tcf_ife_cleanup,
827 .init = tcf_ife_init,
828 .walk = tcf_ife_walker,
829 .lookup = tcf_ife_search,
830 .size = sizeof(struct tcf_ife_info),
831 };
832
833 static __net_init int ife_init_net(struct net *net)
834 {
835 struct tc_action_net *tn = net_generic(net, ife_net_id);
836
837 return tc_action_net_init(tn, &act_ife_ops);
838 }
839
840 static void __net_exit ife_exit_net(struct net *net)
841 {
842 struct tc_action_net *tn = net_generic(net, ife_net_id);
843
844 tc_action_net_exit(tn);
845 }
846
847 static struct pernet_operations ife_net_ops = {
848 .init = ife_init_net,
849 .exit = ife_exit_net,
850 .id = &ife_net_id,
851 .size = sizeof(struct tc_action_net),
852 };
853
854 static int __init ife_init_module(void)
855 {
856 return tcf_register_action(&act_ife_ops, &ife_net_ops);
857 }
858
859 static void __exit ife_cleanup_module(void)
860 {
861 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
862 }
863
864 module_init(ife_init_module);
865 module_exit(ife_cleanup_module);
866
867 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
868 MODULE_DESCRIPTION("Inter-FE LFB action");
869 MODULE_LICENSE("GPL");
Linux with added FPC-III support