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rt2x00usb: fix anchor initialization
[linux/fpc-iii.git] / net / sched / act_ife.c
blob95c463cbb9a6921b63fde46e040024fe4afdbd8a
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 + NLA_HDRLEN);
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_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi)
67 {
68 u16 edata = 0;
69
70 if (mi->metaval)
71 edata = *(u16 *)mi->metaval;
72 else if (metaval)
73 edata = metaval;
74
75 if (!edata) /* will not encode */
76 return 0;
77
78 edata = htons(edata);
79 return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata);
80 }
81 EXPORT_SYMBOL_GPL(ife_encode_meta_u16);
82
83 int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi)
84 {
85 if (mi->metaval)
86 return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval);
87 else
88 return nla_put(skb, mi->metaid, 0, NULL);
89 }
90 EXPORT_SYMBOL_GPL(ife_get_meta_u32);
91
92 int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi)
93 {
94 if (metaval || mi->metaval)
95 return 8; /* T+L+V == 2+2+4 */
96
97 return 0;
98 }
99 EXPORT_SYMBOL_GPL(ife_check_meta_u32);
100
101 int ife_check_meta_u16(u16 metaval, struct tcf_meta_info *mi)
102 {
103 if (metaval || mi->metaval)
104 return 8; /* T+L+(V) == 2+2+(2+2bytepad) */
105
106 return 0;
107 }
108 EXPORT_SYMBOL_GPL(ife_check_meta_u16);
109
110 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
111 {
112 u32 edata = metaval;
113
114 if (mi->metaval)
115 edata = *(u32 *)mi->metaval;
116 else if (metaval)
117 edata = metaval;
118
119 if (!edata) /* will not encode */
120 return 0;
121
122 edata = htonl(edata);
123 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
124 }
125 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
126
127 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
128 {
129 if (mi->metaval)
130 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
131 else
132 return nla_put(skb, mi->metaid, 0, NULL);
133 }
134 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
135
136 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
137 {
138 mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
139 if (!mi->metaval)
140 return -ENOMEM;
141
142 return 0;
143 }
144 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
145
146 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
147 {
148 mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
149 if (!mi->metaval)
150 return -ENOMEM;
151
152 return 0;
153 }
154 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
155
156 void ife_release_meta_gen(struct tcf_meta_info *mi)
157 {
158 kfree(mi->metaval);
159 }
160 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
161
162 int ife_validate_meta_u32(void *val, int len)
163 {
164 if (len == sizeof(u32))
165 return 0;
166
167 return -EINVAL;
168 }
169 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
170
171 int ife_validate_meta_u16(void *val, int len)
172 {
173 /* length will not include padding */
174 if (len == sizeof(u16))
175 return 0;
176
177 return -EINVAL;
178 }
179 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
180
181 static LIST_HEAD(ifeoplist);
182 static DEFINE_RWLOCK(ife_mod_lock);
183
184 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
185 {
186 struct tcf_meta_ops *o;
187
188 read_lock(&ife_mod_lock);
189 list_for_each_entry(o, &ifeoplist, list) {
190 if (o->metaid == metaid) {
191 if (!try_module_get(o->owner))
192 o = NULL;
193 read_unlock(&ife_mod_lock);
194 return o;
195 }
196 }
197 read_unlock(&ife_mod_lock);
198
199 return NULL;
200 }
201
202 int register_ife_op(struct tcf_meta_ops *mops)
203 {
204 struct tcf_meta_ops *m;
205
206 if (!mops->metaid || !mops->metatype || !mops->name ||
207 !mops->check_presence || !mops->encode || !mops->decode ||
208 !mops->get || !mops->alloc)
209 return -EINVAL;
210
211 write_lock(&ife_mod_lock);
212
213 list_for_each_entry(m, &ifeoplist, list) {
214 if (m->metaid == mops->metaid ||
215 (strcmp(mops->name, m->name) == 0)) {
216 write_unlock(&ife_mod_lock);
217 return -EEXIST;
218 }
219 }
220
221 if (!mops->release)
222 mops->release = ife_release_meta_gen;
223
224 list_add_tail(&mops->list, &ifeoplist);
225 write_unlock(&ife_mod_lock);
226 return 0;
227 }
228 EXPORT_SYMBOL_GPL(unregister_ife_op);
229
230 int unregister_ife_op(struct tcf_meta_ops *mops)
231 {
232 struct tcf_meta_ops *m;
233 int err = -ENOENT;
234
235 write_lock(&ife_mod_lock);
236 list_for_each_entry(m, &ifeoplist, list) {
237 if (m->metaid == mops->metaid) {
238 list_del(&mops->list);
239 err = 0;
240 break;
241 }
242 }
243 write_unlock(&ife_mod_lock);
244
245 return err;
246 }
247 EXPORT_SYMBOL_GPL(register_ife_op);
248
249 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
250 {
251 int ret = 0;
252 /* XXX: unfortunately cant use nla_policy at this point
253 * because a length of 0 is valid in the case of
254 * "allow". "use" semantics do enforce for proper
255 * length and i couldve use nla_policy but it makes it hard
256 * to use it just for that..
257 */
258 if (ops->validate)
259 return ops->validate(val, len);
260
261 if (ops->metatype == NLA_U32)
262 ret = ife_validate_meta_u32(val, len);
263 else if (ops->metatype == NLA_U16)
264 ret = ife_validate_meta_u16(val, len);
265
266 return ret;
267 }
268
269 /* called when adding new meta information
270 * under ife->tcf_lock for existing action
271 */
272 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
273 void *val, int len, bool exists)
274 {
275 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
276 int ret = 0;
277
278 if (!ops) {
279 ret = -ENOENT;
280 #ifdef CONFIG_MODULES
281 if (exists)
282 spin_unlock_bh(&ife->tcf_lock);
283 rtnl_unlock();
284 request_module("ifemeta%u", metaid);
285 rtnl_lock();
286 if (exists)
287 spin_lock_bh(&ife->tcf_lock);
288 ops = find_ife_oplist(metaid);
289 #endif
290 }
291
292 if (ops) {
293 ret = 0;
294 if (len)
295 ret = ife_validate_metatype(ops, val, len);
296
297 module_put(ops->owner);
298 }
299
300 return ret;
301 }
302
303 /* called when adding new meta information
304 * under ife->tcf_lock for existing action
305 */
306 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
307 int len, bool atomic)
308 {
309 struct tcf_meta_info *mi = NULL;
310 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
311 int ret = 0;
312
313 if (!ops)
314 return -ENOENT;
315
316 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
317 if (!mi) {
318 /*put back what find_ife_oplist took */
319 module_put(ops->owner);
320 return -ENOMEM;
321 }
322
323 mi->metaid = metaid;
324 mi->ops = ops;
325 if (len > 0) {
326 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
327 if (ret != 0) {
328 kfree(mi);
329 module_put(ops->owner);
330 return ret;
331 }
332 }
333
334 list_add_tail(&mi->metalist, &ife->metalist);
335
336 return ret;
337 }
338
339 static int use_all_metadata(struct tcf_ife_info *ife)
340 {
341 struct tcf_meta_ops *o;
342 int rc = 0;
343 int installed = 0;
344
345 read_lock(&ife_mod_lock);
346 list_for_each_entry(o, &ifeoplist, list) {
347 rc = add_metainfo(ife, o->metaid, NULL, 0, true);
348 if (rc == 0)
349 installed += 1;
350 }
351 read_unlock(&ife_mod_lock);
352
353 if (installed)
354 return 0;
355 else
356 return -EINVAL;
357 }
358
359 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
360 {
361 struct tcf_meta_info *e;
362 struct nlattr *nest;
363 unsigned char *b = skb_tail_pointer(skb);
364 int total_encoded = 0;
365
366 /*can only happen on decode */
367 if (list_empty(&ife->metalist))
368 return 0;
369
370 nest = nla_nest_start(skb, TCA_IFE_METALST);
371 if (!nest)
372 goto out_nlmsg_trim;
373
374 list_for_each_entry(e, &ife->metalist, metalist) {
375 if (!e->ops->get(skb, e))
376 total_encoded += 1;
377 }
378
379 if (!total_encoded)
380 goto out_nlmsg_trim;
381
382 nla_nest_end(skb, nest);
383
384 return 0;
385
386 out_nlmsg_trim:
387 nlmsg_trim(skb, b);
388 return -1;
389 }
390
391 /* under ife->tcf_lock */
392 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
393 {
394 struct tcf_ife_info *ife = to_ife(a);
395 struct tcf_meta_info *e, *n;
396
397 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
398 module_put(e->ops->owner);
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 kfree(e);
407 }
408 }
409
410 static void tcf_ife_cleanup(struct tc_action *a, int bind)
411 {
412 struct tcf_ife_info *ife = to_ife(a);
413
414 spin_lock_bh(&ife->tcf_lock);
415 _tcf_ife_cleanup(a, bind);
416 spin_unlock_bh(&ife->tcf_lock);
417 }
418
419 /* under ife->tcf_lock for existing action */
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(ife, i, val, len, exists);
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 struct tc_ife *parm;
455 u16 ife_type = 0;
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);
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_hash_check(tn, parm->index, a, bind);
472 if (exists && bind)
473 return 0;
474
475 if (parm->flags & IFE_ENCODE) {
476 /* Until we get issued the ethertype, we cant have
477 * a default..
478 **/
479 if (!tb[TCA_IFE_TYPE]) {
480 if (exists)
481 tcf_hash_release(*a, bind);
482 pr_info("You MUST pass etherype for encoding\n");
483 return -EINVAL;
484 }
485 }
486
487 if (!exists) {
488 ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops,
489 bind, false);
490 if (ret)
491 return ret;
492 ret = ACT_P_CREATED;
493 } else {
494 tcf_hash_release(*a, bind);
495 if (!ovr)
496 return -EEXIST;
497 }
498
499 ife = to_ife(*a);
500 ife->flags = parm->flags;
501
502 if (parm->flags & IFE_ENCODE) {
503 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
504 if (tb[TCA_IFE_DMAC])
505 daddr = nla_data(tb[TCA_IFE_DMAC]);
506 if (tb[TCA_IFE_SMAC])
507 saddr = nla_data(tb[TCA_IFE_SMAC]);
508 }
509
510 if (exists)
511 spin_lock_bh(&ife->tcf_lock);
512 ife->tcf_action = parm->action;
513
514 if (parm->flags & IFE_ENCODE) {
515 if (daddr)
516 ether_addr_copy(ife->eth_dst, daddr);
517 else
518 eth_zero_addr(ife->eth_dst);
519
520 if (saddr)
521 ether_addr_copy(ife->eth_src, saddr);
522 else
523 eth_zero_addr(ife->eth_src);
524
525 ife->eth_type = ife_type;
526 }
527
528 if (ret == ACT_P_CREATED)
529 INIT_LIST_HEAD(&ife->metalist);
530
531 if (tb[TCA_IFE_METALST]) {
532 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
533 NULL);
534 if (err) {
535 metadata_parse_err:
536 if (exists)
537 tcf_hash_release(*a, bind);
538 if (ret == ACT_P_CREATED)
539 _tcf_ife_cleanup(*a, bind);
540
541 if (exists)
542 spin_unlock_bh(&ife->tcf_lock);
543 return err;
544 }
545
546 err = populate_metalist(ife, tb2, exists);
547 if (err)
548 goto metadata_parse_err;
549
550 } else {
551 /* if no passed metadata allow list or passed allow-all
552 * then here we process by adding as many supported metadatum
553 * as we can. You better have at least one else we are
554 * going to bail out
555 */
556 err = use_all_metadata(ife);
557 if (err) {
558 if (ret == ACT_P_CREATED)
559 _tcf_ife_cleanup(*a, bind);
560
561 if (exists)
562 spin_unlock_bh(&ife->tcf_lock);
563 return err;
564 }
565 }
566
567 if (exists)
568 spin_unlock_bh(&ife->tcf_lock);
569
570 if (ret == ACT_P_CREATED)
571 tcf_hash_insert(tn, *a);
572
573 return ret;
574 }
575
576 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
577 int ref)
578 {
579 unsigned char *b = skb_tail_pointer(skb);
580 struct tcf_ife_info *ife = to_ife(a);
581 struct tc_ife opt = {
582 .index = ife->tcf_index,
583 .refcnt = ife->tcf_refcnt - ref,
584 .bindcnt = ife->tcf_bindcnt - bind,
585 .action = ife->tcf_action,
586 .flags = ife->flags,
587 };
588 struct tcf_t t;
589
590 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
591 goto nla_put_failure;
592
593 tcf_tm_dump(&t, &ife->tcf_tm);
594 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
595 goto nla_put_failure;
596
597 if (!is_zero_ether_addr(ife->eth_dst)) {
598 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
599 goto nla_put_failure;
600 }
601
602 if (!is_zero_ether_addr(ife->eth_src)) {
603 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
604 goto nla_put_failure;
605 }
606
607 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
608 goto nla_put_failure;
609
610 if (dump_metalist(skb, ife)) {
611 /*ignore failure to dump metalist */
612 pr_info("Failed to dump metalist\n");
613 }
614
615 return skb->len;
616
617 nla_put_failure:
618 nlmsg_trim(skb, b);
619 return -1;
620 }
621
622 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
623 u16 metaid, u16 mlen, void *mdata)
624 {
625 struct tcf_meta_info *e;
626
627 /* XXX: use hash to speed up */
628 list_for_each_entry(e, &ife->metalist, metalist) {
629 if (metaid == e->metaid) {
630 if (e->ops) {
631 /* We check for decode presence already */
632 return e->ops->decode(skb, mdata, mlen);
633 }
634 }
635 }
636
637 return 0;
638 }
639
640 struct ifeheadr {
641 __be16 metalen;
642 u8 tlv_data[];
643 };
644
645 struct meta_tlvhdr {
646 __be16 type;
647 __be16 len;
648 };
649
650 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
651 struct tcf_result *res)
652 {
653 struct tcf_ife_info *ife = to_ife(a);
654 int action = ife->tcf_action;
655 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
656 int ifehdrln = (int)ifehdr->metalen;
657 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
658
659 spin_lock(&ife->tcf_lock);
660 bstats_update(&ife->tcf_bstats, skb);
661 tcf_lastuse_update(&ife->tcf_tm);
662 spin_unlock(&ife->tcf_lock);
663
664 ifehdrln = ntohs(ifehdrln);
665 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
666 spin_lock(&ife->tcf_lock);
667 ife->tcf_qstats.drops++;
668 spin_unlock(&ife->tcf_lock);
669 return TC_ACT_SHOT;
670 }
671
672 skb_set_mac_header(skb, ifehdrln);
673 __skb_pull(skb, ifehdrln);
674 skb->protocol = eth_type_trans(skb, skb->dev);
675 ifehdrln -= IFE_METAHDRLEN;
676
677 while (ifehdrln > 0) {
678 u8 *tlvdata = (u8 *)tlv;
679 u16 mtype = tlv->type;
680 u16 mlen = tlv->len;
681 u16 alen;
682
683 mtype = ntohs(mtype);
684 mlen = ntohs(mlen);
685 alen = NLA_ALIGN(mlen);
686
687 if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN),
688 (void *)(tlvdata + NLA_HDRLEN))) {
689 /* abuse overlimits to count when we receive metadata
690 * but dont have an ops for it
691 */
692 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
693 mtype, mlen);
694 ife->tcf_qstats.overlimits++;
695 }
696
697 tlvdata += alen;
698 ifehdrln -= alen;
699 tlv = (struct meta_tlvhdr *)tlvdata;
700 }
701
702 skb_reset_network_header(skb);
703 return action;
704 }
705
706 /*XXX: check if we can do this at install time instead of current
707 * send data path
708 **/
709 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
710 {
711 struct tcf_meta_info *e, *n;
712 int tot_run_sz = 0, run_sz = 0;
713
714 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
715 if (e->ops->check_presence) {
716 run_sz = e->ops->check_presence(skb, e);
717 tot_run_sz += run_sz;
718 }
719 }
720
721 return tot_run_sz;
722 }
723
724 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
725 struct tcf_result *res)
726 {
727 struct tcf_ife_info *ife = to_ife(a);
728 int action = ife->tcf_action;
729 struct ethhdr *oethh; /* outer ether header */
730 struct ethhdr *iethh; /* inner eth header */
731 struct tcf_meta_info *e;
732 /*
733 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
734 where ORIGDATA = original ethernet header ...
735 */
736 u16 metalen = ife_get_sz(skb, ife);
737 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
738 unsigned int skboff = skb->dev->hard_header_len;
739 u32 at = G_TC_AT(skb->tc_verd);
740 int new_len = skb->len + hdrm;
741 bool exceed_mtu = false;
742 int err;
743
744 if (at & AT_EGRESS) {
745 if (new_len > skb->dev->mtu)
746 exceed_mtu = true;
747 }
748
749 spin_lock(&ife->tcf_lock);
750 bstats_update(&ife->tcf_bstats, skb);
751 tcf_lastuse_update(&ife->tcf_tm);
752
753 if (!metalen) { /* no metadata to send */
754 /* abuse overlimits to count when we allow packet
755 * with no metadata
756 */
757 ife->tcf_qstats.overlimits++;
758 spin_unlock(&ife->tcf_lock);
759 return action;
760 }
761 /* could be stupid policy setup or mtu config
762 * so lets be conservative.. */
763 if ((action == TC_ACT_SHOT) || exceed_mtu) {
764 ife->tcf_qstats.drops++;
765 spin_unlock(&ife->tcf_lock);
766 return TC_ACT_SHOT;
767 }
768
769 err = skb_cow_head(skb, hdrm);
770 if (unlikely(err)) {
771 ife->tcf_qstats.drops++;
772 spin_unlock(&ife->tcf_lock);
773 return TC_ACT_SHOT;
774 }
775
776 if (!(at & AT_EGRESS))
777 skb_push(skb, skb->dev->hard_header_len);
778
779 iethh = (struct ethhdr *)skb->data;
780 __skb_push(skb, hdrm);
781 memcpy(skb->data, iethh, skb->mac_len);
782 skb_reset_mac_header(skb);
783 oethh = eth_hdr(skb);
784
785 /*total metadata length */
786 metalen += IFE_METAHDRLEN;
787 metalen = htons(metalen);
788 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
789 skboff += IFE_METAHDRLEN;
790
791 /* XXX: we dont have a clever way of telling encode to
792 * not repeat some of the computations that are done by
793 * ops->presence_check...
794 */
795 list_for_each_entry(e, &ife->metalist, metalist) {
796 if (e->ops->encode) {
797 err = e->ops->encode(skb, (void *)(skb->data + skboff),
798 e);
799 }
800 if (err < 0) {
801 /* too corrupt to keep around if overwritten */
802 ife->tcf_qstats.drops++;
803 spin_unlock(&ife->tcf_lock);
804 return TC_ACT_SHOT;
805 }
806 skboff += err;
807 }
808
809 if (!is_zero_ether_addr(ife->eth_src))
810 ether_addr_copy(oethh->h_source, ife->eth_src);
811 else
812 ether_addr_copy(oethh->h_source, iethh->h_source);
813 if (!is_zero_ether_addr(ife->eth_dst))
814 ether_addr_copy(oethh->h_dest, ife->eth_dst);
815 else
816 ether_addr_copy(oethh->h_dest, iethh->h_dest);
817 oethh->h_proto = htons(ife->eth_type);
818
819 if (!(at & AT_EGRESS))
820 skb_pull(skb, skb->dev->hard_header_len);
821
822 spin_unlock(&ife->tcf_lock);
823
824 return action;
825 }
826
827 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
828 struct tcf_result *res)
829 {
830 struct tcf_ife_info *ife = to_ife(a);
831
832 if (ife->flags & IFE_ENCODE)
833 return tcf_ife_encode(skb, a, res);
834
835 if (!(ife->flags & IFE_ENCODE))
836 return tcf_ife_decode(skb, a, res);
837
838 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
839 spin_lock(&ife->tcf_lock);
840 bstats_update(&ife->tcf_bstats, skb);
841 tcf_lastuse_update(&ife->tcf_tm);
842 ife->tcf_qstats.drops++;
843 spin_unlock(&ife->tcf_lock);
844
845 return TC_ACT_SHOT;
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 {
852 struct tc_action_net *tn = net_generic(net, ife_net_id);
853
854 return tcf_generic_walker(tn, skb, cb, type, ops);
855 }
856
857 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
858 {
859 struct tc_action_net *tn = net_generic(net, ife_net_id);
860
861 return tcf_hash_search(tn, a, index);
862 }
863
864 static struct tc_action_ops act_ife_ops = {
865 .kind = "ife",
866 .type = TCA_ACT_IFE,
867 .owner = THIS_MODULE,
868 .act = tcf_ife_act,
869 .dump = tcf_ife_dump,
870 .cleanup = tcf_ife_cleanup,
871 .init = tcf_ife_init,
872 .walk = tcf_ife_walker,
873 .lookup = tcf_ife_search,
874 .size = sizeof(struct tcf_ife_info),
875 };
876
877 static __net_init int ife_init_net(struct net *net)
878 {
879 struct tc_action_net *tn = net_generic(net, ife_net_id);
880
881 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
882 }
883
884 static void __net_exit ife_exit_net(struct net *net)
885 {
886 struct tc_action_net *tn = net_generic(net, ife_net_id);
887
888 tc_action_net_exit(tn);
889 }
890
891 static struct pernet_operations ife_net_ops = {
892 .init = ife_init_net,
893 .exit = ife_exit_net,
894 .id = &ife_net_id,
895 .size = sizeof(struct tc_action_net),
896 };
897
898 static int __init ife_init_module(void)
899 {
900 return tcf_register_action(&act_ife_ops, &ife_net_ops);
901 }
902
903 static void __exit ife_cleanup_module(void)
904 {
905 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
906 }
907
908 module_init(ife_init_module);
909 module_exit(ife_cleanup_module);
910
911 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
912 MODULE_DESCRIPTION("Inter-FE LFB action");
913 MODULE_LICENSE("GPL");
Linux with added FPC-III support