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md-cluster: introduce dlm_lock_sync_interruptible to fix tasks hang
[linux/fpc-iii.git] / net / sched / act_ife.c
blobe87cd81315e1340869d81a6535230ceb2648521a
1 /*
2 * net/sched/ife.c Inter-FE action based on ForCES WG InterFE LFB
3 *
4 * Refer to:
5 * draft-ietf-forces-interfelfb-03
6 * and
7 * netdev01 paper:
8 * "Distributing Linux Traffic Control Classifier-Action
9 * Subsystem"
10 * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * copyright Jamal Hadi Salim (2015)
18 *
19 */
20
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/errno.h>
25 #include <linux/skbuff.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <net/net_namespace.h>
30 #include <net/netlink.h>
31 #include <net/pkt_sched.h>
32 #include <uapi/linux/tc_act/tc_ife.h>
33 #include <net/tc_act/tc_ife.h>
34 #include <linux/etherdevice.h>
35
36 #define IFE_TAB_MASK 15
37
38 static int ife_net_id;
39 static int max_metacnt = IFE_META_MAX + 1;
40 static struct tc_action_ops act_ife_ops;
41
42 static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
43 [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)},
44 [TCA_IFE_DMAC] = { .len = ETH_ALEN},
45 [TCA_IFE_SMAC] = { .len = ETH_ALEN},
46 [TCA_IFE_TYPE] = { .type = NLA_U16},
47 };
48
49 /* Caller takes care of presenting data in network order
50 */
51 int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
52 {
53 u32 *tlv = (u32 *)(skbdata);
54 u16 totlen = nla_total_size(dlen); /*alignment + hdr */
55 char *dptr = (char *)tlv + NLA_HDRLEN;
56 u32 htlv = attrtype << 16 | dlen;
57
58 *tlv = htonl(htlv);
59 memset(dptr, 0, totlen - NLA_HDRLEN);
60 memcpy(dptr, dval, dlen);
61
62 return totlen;
63 }
64 EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
65
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
84 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
85 {
86 u32 edata = metaval;
87
88 if (mi->metaval)
89 edata = *(u32 *)mi->metaval;
90 else if (metaval)
91 edata = metaval;
92
93 if (!edata) /* will not encode */
94 return 0;
95
96 edata = htonl(edata);
97 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
98 }
99 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
100
101 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
102 {
103 if (mi->metaval)
104 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
105 else
106 return nla_put(skb, mi->metaid, 0, NULL);
107 }
108 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
109
110 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
111 {
112 mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
113 if (!mi->metaval)
114 return -ENOMEM;
115
116 return 0;
117 }
118 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
119
120 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
121 {
122 mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
123 if (!mi->metaval)
124 return -ENOMEM;
125
126 return 0;
127 }
128 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
129
130 void ife_release_meta_gen(struct tcf_meta_info *mi)
131 {
132 kfree(mi->metaval);
133 }
134 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
135
136 int ife_validate_meta_u32(void *val, int len)
137 {
138 if (len == sizeof(u32))
139 return 0;
140
141 return -EINVAL;
142 }
143 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
144
145 int ife_validate_meta_u16(void *val, int len)
146 {
147 /* length will not include padding */
148 if (len == sizeof(u16))
149 return 0;
150
151 return -EINVAL;
152 }
153 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
154
155 static LIST_HEAD(ifeoplist);
156 static DEFINE_RWLOCK(ife_mod_lock);
157
158 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
159 {
160 struct tcf_meta_ops *o;
161
162 read_lock(&ife_mod_lock);
163 list_for_each_entry(o, &ifeoplist, list) {
164 if (o->metaid == metaid) {
165 if (!try_module_get(o->owner))
166 o = NULL;
167 read_unlock(&ife_mod_lock);
168 return o;
169 }
170 }
171 read_unlock(&ife_mod_lock);
172
173 return NULL;
174 }
175
176 int register_ife_op(struct tcf_meta_ops *mops)
177 {
178 struct tcf_meta_ops *m;
179
180 if (!mops->metaid || !mops->metatype || !mops->name ||
181 !mops->check_presence || !mops->encode || !mops->decode ||
182 !mops->get || !mops->alloc)
183 return -EINVAL;
184
185 write_lock(&ife_mod_lock);
186
187 list_for_each_entry(m, &ifeoplist, list) {
188 if (m->metaid == mops->metaid ||
189 (strcmp(mops->name, m->name) == 0)) {
190 write_unlock(&ife_mod_lock);
191 return -EEXIST;
192 }
193 }
194
195 if (!mops->release)
196 mops->release = ife_release_meta_gen;
197
198 list_add_tail(&mops->list, &ifeoplist);
199 write_unlock(&ife_mod_lock);
200 return 0;
201 }
202 EXPORT_SYMBOL_GPL(unregister_ife_op);
203
204 int unregister_ife_op(struct tcf_meta_ops *mops)
205 {
206 struct tcf_meta_ops *m;
207 int err = -ENOENT;
208
209 write_lock(&ife_mod_lock);
210 list_for_each_entry(m, &ifeoplist, list) {
211 if (m->metaid == mops->metaid) {
212 list_del(&mops->list);
213 err = 0;
214 break;
215 }
216 }
217 write_unlock(&ife_mod_lock);
218
219 return err;
220 }
221 EXPORT_SYMBOL_GPL(register_ife_op);
222
223 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
224 {
225 int ret = 0;
226 /* XXX: unfortunately cant use nla_policy at this point
227 * because a length of 0 is valid in the case of
228 * "allow". "use" semantics do enforce for proper
229 * length and i couldve use nla_policy but it makes it hard
230 * to use it just for that..
231 */
232 if (ops->validate)
233 return ops->validate(val, len);
234
235 if (ops->metatype == NLA_U32)
236 ret = ife_validate_meta_u32(val, len);
237 else if (ops->metatype == NLA_U16)
238 ret = ife_validate_meta_u16(val, len);
239
240 return ret;
241 }
242
243 /* called when adding new meta information
244 * under ife->tcf_lock for existing action
245 */
246 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
247 void *val, int len, bool exists)
248 {
249 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
250 int ret = 0;
251
252 if (!ops) {
253 ret = -ENOENT;
254 #ifdef CONFIG_MODULES
255 if (exists)
256 spin_unlock_bh(&ife->tcf_lock);
257 rtnl_unlock();
258 request_module("ifemeta%u", metaid);
259 rtnl_lock();
260 if (exists)
261 spin_lock_bh(&ife->tcf_lock);
262 ops = find_ife_oplist(metaid);
263 #endif
264 }
265
266 if (ops) {
267 ret = 0;
268 if (len)
269 ret = ife_validate_metatype(ops, val, len);
270
271 module_put(ops->owner);
272 }
273
274 return ret;
275 }
276
277 /* called when adding new meta information
278 * under ife->tcf_lock for existing action
279 */
280 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
281 int len, bool atomic)
282 {
283 struct tcf_meta_info *mi = NULL;
284 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
285 int ret = 0;
286
287 if (!ops)
288 return -ENOENT;
289
290 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
291 if (!mi) {
292 /*put back what find_ife_oplist took */
293 module_put(ops->owner);
294 return -ENOMEM;
295 }
296
297 mi->metaid = metaid;
298 mi->ops = ops;
299 if (len > 0) {
300 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
301 if (ret != 0) {
302 kfree(mi);
303 module_put(ops->owner);
304 return ret;
305 }
306 }
307
308 list_add_tail(&mi->metalist, &ife->metalist);
309
310 return ret;
311 }
312
313 static int use_all_metadata(struct tcf_ife_info *ife)
314 {
315 struct tcf_meta_ops *o;
316 int rc = 0;
317 int installed = 0;
318
319 read_lock(&ife_mod_lock);
320 list_for_each_entry(o, &ifeoplist, list) {
321 rc = add_metainfo(ife, o->metaid, NULL, 0, true);
322 if (rc == 0)
323 installed += 1;
324 }
325 read_unlock(&ife_mod_lock);
326
327 if (installed)
328 return 0;
329 else
330 return -EINVAL;
331 }
332
333 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
334 {
335 struct tcf_meta_info *e;
336 struct nlattr *nest;
337 unsigned char *b = skb_tail_pointer(skb);
338 int total_encoded = 0;
339
340 /*can only happen on decode */
341 if (list_empty(&ife->metalist))
342 return 0;
343
344 nest = nla_nest_start(skb, TCA_IFE_METALST);
345 if (!nest)
346 goto out_nlmsg_trim;
347
348 list_for_each_entry(e, &ife->metalist, metalist) {
349 if (!e->ops->get(skb, e))
350 total_encoded += 1;
351 }
352
353 if (!total_encoded)
354 goto out_nlmsg_trim;
355
356 nla_nest_end(skb, nest);
357
358 return 0;
359
360 out_nlmsg_trim:
361 nlmsg_trim(skb, b);
362 return -1;
363 }
364
365 /* under ife->tcf_lock */
366 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
367 {
368 struct tcf_ife_info *ife = to_ife(a);
369 struct tcf_meta_info *e, *n;
370
371 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
372 module_put(e->ops->owner);
373 list_del(&e->metalist);
374 if (e->metaval) {
375 if (e->ops->release)
376 e->ops->release(e);
377 else
378 kfree(e->metaval);
379 }
380 kfree(e);
381 }
382 }
383
384 static void tcf_ife_cleanup(struct tc_action *a, int bind)
385 {
386 struct tcf_ife_info *ife = to_ife(a);
387
388 spin_lock_bh(&ife->tcf_lock);
389 _tcf_ife_cleanup(a, bind);
390 spin_unlock_bh(&ife->tcf_lock);
391 }
392
393 /* under ife->tcf_lock for existing action */
394 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
395 bool exists)
396 {
397 int len = 0;
398 int rc = 0;
399 int i = 0;
400 void *val;
401
402 for (i = 1; i < max_metacnt; i++) {
403 if (tb[i]) {
404 val = nla_data(tb[i]);
405 len = nla_len(tb[i]);
406
407 rc = load_metaops_and_vet(ife, i, val, len, exists);
408 if (rc != 0)
409 return rc;
410
411 rc = add_metainfo(ife, i, val, len, exists);
412 if (rc)
413 return rc;
414 }
415 }
416
417 return rc;
418 }
419
420 static int tcf_ife_init(struct net *net, struct nlattr *nla,
421 struct nlattr *est, struct tc_action **a,
422 int ovr, int bind)
423 {
424 struct tc_action_net *tn = net_generic(net, ife_net_id);
425 struct nlattr *tb[TCA_IFE_MAX + 1];
426 struct nlattr *tb2[IFE_META_MAX + 1];
427 struct tcf_ife_info *ife;
428 struct tc_ife *parm;
429 u16 ife_type = 0;
430 u8 *daddr = NULL;
431 u8 *saddr = NULL;
432 bool exists = false;
433 int ret = 0;
434 int err;
435
436 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
437 if (err < 0)
438 return err;
439
440 if (!tb[TCA_IFE_PARMS])
441 return -EINVAL;
442
443 parm = nla_data(tb[TCA_IFE_PARMS]);
444
445 exists = tcf_hash_check(tn, parm->index, a, bind);
446 if (exists && bind)
447 return 0;
448
449 if (parm->flags & IFE_ENCODE) {
450 /* Until we get issued the ethertype, we cant have
451 * a default..
452 **/
453 if (!tb[TCA_IFE_TYPE]) {
454 if (exists)
455 tcf_hash_release(*a, bind);
456 pr_info("You MUST pass etherype for encoding\n");
457 return -EINVAL;
458 }
459 }
460
461 if (!exists) {
462 ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops,
463 bind, false);
464 if (ret)
465 return ret;
466 ret = ACT_P_CREATED;
467 } else {
468 tcf_hash_release(*a, bind);
469 if (!ovr)
470 return -EEXIST;
471 }
472
473 ife = to_ife(*a);
474 ife->flags = parm->flags;
475
476 if (parm->flags & IFE_ENCODE) {
477 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
478 if (tb[TCA_IFE_DMAC])
479 daddr = nla_data(tb[TCA_IFE_DMAC]);
480 if (tb[TCA_IFE_SMAC])
481 saddr = nla_data(tb[TCA_IFE_SMAC]);
482 }
483
484 if (exists)
485 spin_lock_bh(&ife->tcf_lock);
486 ife->tcf_action = parm->action;
487
488 if (parm->flags & IFE_ENCODE) {
489 if (daddr)
490 ether_addr_copy(ife->eth_dst, daddr);
491 else
492 eth_zero_addr(ife->eth_dst);
493
494 if (saddr)
495 ether_addr_copy(ife->eth_src, saddr);
496 else
497 eth_zero_addr(ife->eth_src);
498
499 ife->eth_type = ife_type;
500 }
501
502 if (ret == ACT_P_CREATED)
503 INIT_LIST_HEAD(&ife->metalist);
504
505 if (tb[TCA_IFE_METALST]) {
506 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
507 NULL);
508 if (err) {
509 metadata_parse_err:
510 if (exists)
511 tcf_hash_release(*a, bind);
512 if (ret == ACT_P_CREATED)
513 _tcf_ife_cleanup(*a, bind);
514
515 if (exists)
516 spin_unlock_bh(&ife->tcf_lock);
517 return err;
518 }
519
520 err = populate_metalist(ife, tb2, exists);
521 if (err)
522 goto metadata_parse_err;
523
524 } else {
525 /* if no passed metadata allow list or passed allow-all
526 * then here we process by adding as many supported metadatum
527 * as we can. You better have at least one else we are
528 * going to bail out
529 */
530 err = use_all_metadata(ife);
531 if (err) {
532 if (ret == ACT_P_CREATED)
533 _tcf_ife_cleanup(*a, bind);
534
535 if (exists)
536 spin_unlock_bh(&ife->tcf_lock);
537 return err;
538 }
539 }
540
541 if (exists)
542 spin_unlock_bh(&ife->tcf_lock);
543
544 if (ret == ACT_P_CREATED)
545 tcf_hash_insert(tn, *a);
546
547 return ret;
548 }
549
550 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
551 int ref)
552 {
553 unsigned char *b = skb_tail_pointer(skb);
554 struct tcf_ife_info *ife = to_ife(a);
555 struct tc_ife opt = {
556 .index = ife->tcf_index,
557 .refcnt = ife->tcf_refcnt - ref,
558 .bindcnt = ife->tcf_bindcnt - bind,
559 .action = ife->tcf_action,
560 .flags = ife->flags,
561 };
562 struct tcf_t t;
563
564 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
565 goto nla_put_failure;
566
567 tcf_tm_dump(&t, &ife->tcf_tm);
568 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
569 goto nla_put_failure;
570
571 if (!is_zero_ether_addr(ife->eth_dst)) {
572 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
573 goto nla_put_failure;
574 }
575
576 if (!is_zero_ether_addr(ife->eth_src)) {
577 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
578 goto nla_put_failure;
579 }
580
581 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
582 goto nla_put_failure;
583
584 if (dump_metalist(skb, ife)) {
585 /*ignore failure to dump metalist */
586 pr_info("Failed to dump metalist\n");
587 }
588
589 return skb->len;
590
591 nla_put_failure:
592 nlmsg_trim(skb, b);
593 return -1;
594 }
595
596 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
597 u16 metaid, u16 mlen, void *mdata)
598 {
599 struct tcf_meta_info *e;
600
601 /* XXX: use hash to speed up */
602 list_for_each_entry(e, &ife->metalist, metalist) {
603 if (metaid == e->metaid) {
604 if (e->ops) {
605 /* We check for decode presence already */
606 return e->ops->decode(skb, mdata, mlen);
607 }
608 }
609 }
610
611 return 0;
612 }
613
614 struct ifeheadr {
615 __be16 metalen;
616 u8 tlv_data[];
617 };
618
619 struct meta_tlvhdr {
620 __be16 type;
621 __be16 len;
622 };
623
624 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
625 struct tcf_result *res)
626 {
627 struct tcf_ife_info *ife = to_ife(a);
628 int action = ife->tcf_action;
629 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
630 u16 ifehdrln = ifehdr->metalen;
631 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
632
633 spin_lock(&ife->tcf_lock);
634 bstats_update(&ife->tcf_bstats, skb);
635 tcf_lastuse_update(&ife->tcf_tm);
636 spin_unlock(&ife->tcf_lock);
637
638 ifehdrln = ntohs(ifehdrln);
639 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
640 spin_lock(&ife->tcf_lock);
641 ife->tcf_qstats.drops++;
642 spin_unlock(&ife->tcf_lock);
643 return TC_ACT_SHOT;
644 }
645
646 skb_set_mac_header(skb, ifehdrln);
647 __skb_pull(skb, ifehdrln);
648 skb->protocol = eth_type_trans(skb, skb->dev);
649 ifehdrln -= IFE_METAHDRLEN;
650
651 while (ifehdrln > 0) {
652 u8 *tlvdata = (u8 *)tlv;
653 u16 mtype = tlv->type;
654 u16 mlen = tlv->len;
655 u16 alen;
656
657 mtype = ntohs(mtype);
658 mlen = ntohs(mlen);
659 alen = NLA_ALIGN(mlen);
660
661 if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN),
662 (void *)(tlvdata + NLA_HDRLEN))) {
663 /* abuse overlimits to count when we receive metadata
664 * but dont have an ops for it
665 */
666 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
667 mtype, mlen);
668 ife->tcf_qstats.overlimits++;
669 }
670
671 tlvdata += alen;
672 ifehdrln -= alen;
673 tlv = (struct meta_tlvhdr *)tlvdata;
674 }
675
676 skb_reset_network_header(skb);
677 return action;
678 }
679
680 /*XXX: check if we can do this at install time instead of current
681 * send data path
682 **/
683 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
684 {
685 struct tcf_meta_info *e, *n;
686 int tot_run_sz = 0, run_sz = 0;
687
688 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
689 if (e->ops->check_presence) {
690 run_sz = e->ops->check_presence(skb, e);
691 tot_run_sz += run_sz;
692 }
693 }
694
695 return tot_run_sz;
696 }
697
698 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
699 struct tcf_result *res)
700 {
701 struct tcf_ife_info *ife = to_ife(a);
702 int action = ife->tcf_action;
703 struct ethhdr *oethh; /* outer ether header */
704 struct ethhdr *iethh; /* inner eth header */
705 struct tcf_meta_info *e;
706 /*
707 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
708 where ORIGDATA = original ethernet header ...
709 */
710 u16 metalen = ife_get_sz(skb, ife);
711 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
712 unsigned int skboff = skb->dev->hard_header_len;
713 u32 at = G_TC_AT(skb->tc_verd);
714 int new_len = skb->len + hdrm;
715 bool exceed_mtu = false;
716 int err;
717
718 if (at & AT_EGRESS) {
719 if (new_len > skb->dev->mtu)
720 exceed_mtu = true;
721 }
722
723 spin_lock(&ife->tcf_lock);
724 bstats_update(&ife->tcf_bstats, skb);
725 tcf_lastuse_update(&ife->tcf_tm);
726
727 if (!metalen) { /* no metadata to send */
728 /* abuse overlimits to count when we allow packet
729 * with no metadata
730 */
731 ife->tcf_qstats.overlimits++;
732 spin_unlock(&ife->tcf_lock);
733 return action;
734 }
735 /* could be stupid policy setup or mtu config
736 * so lets be conservative.. */
737 if ((action == TC_ACT_SHOT) || exceed_mtu) {
738 ife->tcf_qstats.drops++;
739 spin_unlock(&ife->tcf_lock);
740 return TC_ACT_SHOT;
741 }
742
743 iethh = eth_hdr(skb);
744
745 err = skb_cow_head(skb, hdrm);
746 if (unlikely(err)) {
747 ife->tcf_qstats.drops++;
748 spin_unlock(&ife->tcf_lock);
749 return TC_ACT_SHOT;
750 }
751
752 if (!(at & AT_EGRESS))
753 skb_push(skb, skb->dev->hard_header_len);
754
755 __skb_push(skb, hdrm);
756 memcpy(skb->data, iethh, skb->mac_len);
757 skb_reset_mac_header(skb);
758 oethh = eth_hdr(skb);
759
760 /*total metadata length */
761 metalen += IFE_METAHDRLEN;
762 metalen = htons(metalen);
763 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
764 skboff += IFE_METAHDRLEN;
765
766 /* XXX: we dont have a clever way of telling encode to
767 * not repeat some of the computations that are done by
768 * ops->presence_check...
769 */
770 list_for_each_entry(e, &ife->metalist, metalist) {
771 if (e->ops->encode) {
772 err = e->ops->encode(skb, (void *)(skb->data + skboff),
773 e);
774 }
775 if (err < 0) {
776 /* too corrupt to keep around if overwritten */
777 ife->tcf_qstats.drops++;
778 spin_unlock(&ife->tcf_lock);
779 return TC_ACT_SHOT;
780 }
781 skboff += err;
782 }
783
784 if (!is_zero_ether_addr(ife->eth_src))
785 ether_addr_copy(oethh->h_source, ife->eth_src);
786 else
787 ether_addr_copy(oethh->h_source, iethh->h_source);
788 if (!is_zero_ether_addr(ife->eth_dst))
789 ether_addr_copy(oethh->h_dest, ife->eth_dst);
790 else
791 ether_addr_copy(oethh->h_dest, iethh->h_dest);
792 oethh->h_proto = htons(ife->eth_type);
793
794 if (!(at & AT_EGRESS))
795 skb_pull(skb, skb->dev->hard_header_len);
796
797 spin_unlock(&ife->tcf_lock);
798
799 return action;
800 }
801
802 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
803 struct tcf_result *res)
804 {
805 struct tcf_ife_info *ife = to_ife(a);
806
807 if (ife->flags & IFE_ENCODE)
808 return tcf_ife_encode(skb, a, res);
809
810 if (!(ife->flags & IFE_ENCODE))
811 return tcf_ife_decode(skb, a, res);
812
813 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
814 spin_lock(&ife->tcf_lock);
815 bstats_update(&ife->tcf_bstats, skb);
816 tcf_lastuse_update(&ife->tcf_tm);
817 ife->tcf_qstats.drops++;
818 spin_unlock(&ife->tcf_lock);
819
820 return TC_ACT_SHOT;
821 }
822
823 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
824 struct netlink_callback *cb, int type,
825 const struct tc_action_ops *ops)
826 {
827 struct tc_action_net *tn = net_generic(net, ife_net_id);
828
829 return tcf_generic_walker(tn, skb, cb, type, ops);
830 }
831
832 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
833 {
834 struct tc_action_net *tn = net_generic(net, ife_net_id);
835
836 return tcf_hash_search(tn, a, index);
837 }
838
839 static struct tc_action_ops act_ife_ops = {
840 .kind = "ife",
841 .type = TCA_ACT_IFE,
842 .owner = THIS_MODULE,
843 .act = tcf_ife_act,
844 .dump = tcf_ife_dump,
845 .cleanup = tcf_ife_cleanup,
846 .init = tcf_ife_init,
847 .walk = tcf_ife_walker,
848 .lookup = tcf_ife_search,
849 .size = sizeof(struct tcf_ife_info),
850 };
851
852 static __net_init int ife_init_net(struct net *net)
853 {
854 struct tc_action_net *tn = net_generic(net, ife_net_id);
855
856 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
857 }
858
859 static void __net_exit ife_exit_net(struct net *net)
860 {
861 struct tc_action_net *tn = net_generic(net, ife_net_id);
862
863 tc_action_net_exit(tn);
864 }
865
866 static struct pernet_operations ife_net_ops = {
867 .init = ife_init_net,
868 .exit = ife_exit_net,
869 .id = &ife_net_id,
870 .size = sizeof(struct tc_action_net),
871 };
872
873 static int __init ife_init_module(void)
874 {
875 return tcf_register_action(&act_ife_ops, &ife_net_ops);
876 }
877
878 static void __exit ife_cleanup_module(void)
879 {
880 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
881 }
882
883 module_init(ife_init_module);
884 module_exit(ife_cleanup_module);
885
886 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
887 MODULE_DESCRIPTION("Inter-FE LFB action");
888 MODULE_LICENSE("GPL");
Linux with added FPC-III support