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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux/fpc-iii.git] / net / sched / act_ife.c
blob658046dfe02d7210501ee9f0324158b50f6e7858
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
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 /* Caller takes care of presenting data in network order
49 */
50 int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
51 {
52 u32 *tlv = (u32 *)(skbdata);
53 u16 totlen = nla_total_size(dlen); /*alignment + hdr */
54 char *dptr = (char *)tlv + NLA_HDRLEN;
55 u32 htlv = attrtype << 16 | totlen;
56
57 *tlv = htonl(htlv);
58 memset(dptr, 0, totlen - NLA_HDRLEN);
59 memcpy(dptr, dval, dlen);
60
61 return totlen;
62 }
63 EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
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_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
84 {
85 u32 edata = metaval;
86
87 if (mi->metaval)
88 edata = *(u32 *)mi->metaval;
89 else if (metaval)
90 edata = metaval;
91
92 if (!edata) /* will not encode */
93 return 0;
94
95 edata = htonl(edata);
96 return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
97 }
98 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
99
100 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
101 {
102 if (mi->metaval)
103 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
104 else
105 return nla_put(skb, mi->metaid, 0, NULL);
106 }
107 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
108
109 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval)
110 {
111 mi->metaval = kmemdup(metaval, sizeof(u32), GFP_KERNEL);
112 if (!mi->metaval)
113 return -ENOMEM;
114
115 return 0;
116 }
117 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
118
119 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval)
120 {
121 mi->metaval = kmemdup(metaval, sizeof(u16), GFP_KERNEL);
122 if (!mi->metaval)
123 return -ENOMEM;
124
125 return 0;
126 }
127 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
128
129 void ife_release_meta_gen(struct tcf_meta_info *mi)
130 {
131 kfree(mi->metaval);
132 }
133 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
134
135 int ife_validate_meta_u32(void *val, int len)
136 {
137 if (len == 4)
138 return 0;
139
140 return -EINVAL;
141 }
142 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
143
144 int ife_validate_meta_u16(void *val, int len)
145 {
146 /* length will include padding */
147 if (len == NLA_ALIGN(2))
148 return 0;
149
150 return -EINVAL;
151 }
152 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
153
154 static LIST_HEAD(ifeoplist);
155 static DEFINE_RWLOCK(ife_mod_lock);
156
157 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
158 {
159 struct tcf_meta_ops *o;
160
161 read_lock(&ife_mod_lock);
162 list_for_each_entry(o, &ifeoplist, list) {
163 if (o->metaid == metaid) {
164 if (!try_module_get(o->owner))
165 o = NULL;
166 read_unlock(&ife_mod_lock);
167 return o;
168 }
169 }
170 read_unlock(&ife_mod_lock);
171
172 return NULL;
173 }
174
175 int register_ife_op(struct tcf_meta_ops *mops)
176 {
177 struct tcf_meta_ops *m;
178
179 if (!mops->metaid || !mops->metatype || !mops->name ||
180 !mops->check_presence || !mops->encode || !mops->decode ||
181 !mops->get || !mops->alloc)
182 return -EINVAL;
183
184 write_lock(&ife_mod_lock);
185
186 list_for_each_entry(m, &ifeoplist, list) {
187 if (m->metaid == mops->metaid ||
188 (strcmp(mops->name, m->name) == 0)) {
189 write_unlock(&ife_mod_lock);
190 return -EEXIST;
191 }
192 }
193
194 if (!mops->release)
195 mops->release = ife_release_meta_gen;
196
197 list_add_tail(&mops->list, &ifeoplist);
198 write_unlock(&ife_mod_lock);
199 return 0;
200 }
201 EXPORT_SYMBOL_GPL(unregister_ife_op);
202
203 int unregister_ife_op(struct tcf_meta_ops *mops)
204 {
205 struct tcf_meta_ops *m;
206 int err = -ENOENT;
207
208 write_lock(&ife_mod_lock);
209 list_for_each_entry(m, &ifeoplist, list) {
210 if (m->metaid == mops->metaid) {
211 list_del(&mops->list);
212 err = 0;
213 break;
214 }
215 }
216 write_unlock(&ife_mod_lock);
217
218 return err;
219 }
220 EXPORT_SYMBOL_GPL(register_ife_op);
221
222 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
223 {
224 int ret = 0;
225 /* XXX: unfortunately cant use nla_policy at this point
226 * because a length of 0 is valid in the case of
227 * "allow". "use" semantics do enforce for proper
228 * length and i couldve use nla_policy but it makes it hard
229 * to use it just for that..
230 */
231 if (ops->validate)
232 return ops->validate(val, len);
233
234 if (ops->metatype == NLA_U32)
235 ret = ife_validate_meta_u32(val, len);
236 else if (ops->metatype == NLA_U16)
237 ret = ife_validate_meta_u16(val, len);
238
239 return ret;
240 }
241
242 /* called when adding new meta information
243 * under ife->tcf_lock
244 */
245 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
246 void *val, int len)
247 {
248 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
249 int ret = 0;
250
251 if (!ops) {
252 ret = -ENOENT;
253 #ifdef CONFIG_MODULES
254 spin_unlock_bh(&ife->tcf_lock);
255 rtnl_unlock();
256 request_module("ifemeta%u", metaid);
257 rtnl_lock();
258 spin_lock_bh(&ife->tcf_lock);
259 ops = find_ife_oplist(metaid);
260 #endif
261 }
262
263 if (ops) {
264 ret = 0;
265 if (len)
266 ret = ife_validate_metatype(ops, val, len);
267
268 module_put(ops->owner);
269 }
270
271 return ret;
272 }
273
274 /* called when adding new meta information
275 * under ife->tcf_lock
276 */
277 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
278 int len)
279 {
280 struct tcf_meta_info *mi = NULL;
281 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
282 int ret = 0;
283
284 if (!ops)
285 return -ENOENT;
286
287 mi = kzalloc(sizeof(*mi), GFP_KERNEL);
288 if (!mi) {
289 /*put back what find_ife_oplist took */
290 module_put(ops->owner);
291 return -ENOMEM;
292 }
293
294 mi->metaid = metaid;
295 mi->ops = ops;
296 if (len > 0) {
297 ret = ops->alloc(mi, metaval);
298 if (ret != 0) {
299 kfree(mi);
300 module_put(ops->owner);
301 return ret;
302 }
303 }
304
305 list_add_tail(&mi->metalist, &ife->metalist);
306
307 return ret;
308 }
309
310 static int use_all_metadata(struct tcf_ife_info *ife)
311 {
312 struct tcf_meta_ops *o;
313 int rc = 0;
314 int installed = 0;
315
316 list_for_each_entry(o, &ifeoplist, list) {
317 rc = add_metainfo(ife, o->metaid, NULL, 0);
318 if (rc == 0)
319 installed += 1;
320 }
321
322 if (installed)
323 return 0;
324 else
325 return -EINVAL;
326 }
327
328 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
329 {
330 struct tcf_meta_info *e;
331 struct nlattr *nest;
332 unsigned char *b = skb_tail_pointer(skb);
333 int total_encoded = 0;
334
335 /*can only happen on decode */
336 if (list_empty(&ife->metalist))
337 return 0;
338
339 nest = nla_nest_start(skb, TCA_IFE_METALST);
340 if (!nest)
341 goto out_nlmsg_trim;
342
343 list_for_each_entry(e, &ife->metalist, metalist) {
344 if (!e->ops->get(skb, e))
345 total_encoded += 1;
346 }
347
348 if (!total_encoded)
349 goto out_nlmsg_trim;
350
351 nla_nest_end(skb, nest);
352
353 return 0;
354
355 out_nlmsg_trim:
356 nlmsg_trim(skb, b);
357 return -1;
358 }
359
360 /* under ife->tcf_lock */
361 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
362 {
363 struct tcf_ife_info *ife = a->priv;
364 struct tcf_meta_info *e, *n;
365
366 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
367 module_put(e->ops->owner);
368 list_del(&e->metalist);
369 if (e->metaval) {
370 if (e->ops->release)
371 e->ops->release(e);
372 else
373 kfree(e->metaval);
374 }
375 kfree(e);
376 }
377 }
378
379 static void tcf_ife_cleanup(struct tc_action *a, int bind)
380 {
381 struct tcf_ife_info *ife = a->priv;
382
383 spin_lock_bh(&ife->tcf_lock);
384 _tcf_ife_cleanup(a, bind);
385 spin_unlock_bh(&ife->tcf_lock);
386 }
387
388 /* under ife->tcf_lock */
389 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb)
390 {
391 int len = 0;
392 int rc = 0;
393 int i = 0;
394 void *val;
395
396 for (i = 1; i < max_metacnt; i++) {
397 if (tb[i]) {
398 val = nla_data(tb[i]);
399 len = nla_len(tb[i]);
400
401 rc = load_metaops_and_vet(ife, i, val, len);
402 if (rc != 0)
403 return rc;
404
405 rc = add_metainfo(ife, i, val, len);
406 if (rc)
407 return rc;
408 }
409 }
410
411 return rc;
412 }
413
414 static int tcf_ife_init(struct net *net, struct nlattr *nla,
415 struct nlattr *est, struct tc_action *a,
416 int ovr, int bind)
417 {
418 struct tc_action_net *tn = net_generic(net, ife_net_id);
419 struct nlattr *tb[TCA_IFE_MAX + 1];
420 struct nlattr *tb2[IFE_META_MAX + 1];
421 struct tcf_ife_info *ife;
422 struct tc_ife *parm;
423 u16 ife_type = 0;
424 u8 *daddr = NULL;
425 u8 *saddr = NULL;
426 int ret = 0, exists = 0;
427 int err;
428
429 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
430 if (err < 0)
431 return err;
432
433 if (!tb[TCA_IFE_PARMS])
434 return -EINVAL;
435
436 parm = nla_data(tb[TCA_IFE_PARMS]);
437
438 exists = tcf_hash_check(tn, parm->index, a, bind);
439 if (exists && bind)
440 return 0;
441
442 if (parm->flags & IFE_ENCODE) {
443 /* Until we get issued the ethertype, we cant have
444 * a default..
445 **/
446 if (!tb[TCA_IFE_TYPE]) {
447 if (exists)
448 tcf_hash_release(a, bind);
449 pr_info("You MUST pass etherype for encoding\n");
450 return -EINVAL;
451 }
452 }
453
454 if (!exists) {
455 ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife),
456 bind, false);
457 if (ret)
458 return ret;
459 ret = ACT_P_CREATED;
460 } else {
461 tcf_hash_release(a, bind);
462 if (!ovr)
463 return -EEXIST;
464 }
465
466 ife = to_ife(a);
467 ife->flags = parm->flags;
468
469 if (parm->flags & IFE_ENCODE) {
470 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
471 if (tb[TCA_IFE_DMAC])
472 daddr = nla_data(tb[TCA_IFE_DMAC]);
473 if (tb[TCA_IFE_SMAC])
474 saddr = nla_data(tb[TCA_IFE_SMAC]);
475 }
476
477 spin_lock_bh(&ife->tcf_lock);
478 ife->tcf_action = parm->action;
479
480 if (parm->flags & IFE_ENCODE) {
481 if (daddr)
482 ether_addr_copy(ife->eth_dst, daddr);
483 else
484 eth_zero_addr(ife->eth_dst);
485
486 if (saddr)
487 ether_addr_copy(ife->eth_src, saddr);
488 else
489 eth_zero_addr(ife->eth_src);
490
491 ife->eth_type = ife_type;
492 }
493
494 if (ret == ACT_P_CREATED)
495 INIT_LIST_HEAD(&ife->metalist);
496
497 if (tb[TCA_IFE_METALST]) {
498 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
499 NULL);
500 if (err) {
501 metadata_parse_err:
502 if (exists)
503 tcf_hash_release(a, bind);
504 if (ret == ACT_P_CREATED)
505 _tcf_ife_cleanup(a, bind);
506
507 spin_unlock_bh(&ife->tcf_lock);
508 return err;
509 }
510
511 err = populate_metalist(ife, tb2);
512 if (err)
513 goto metadata_parse_err;
514
515 } else {
516 /* if no passed metadata allow list or passed allow-all
517 * then here we process by adding as many supported metadatum
518 * as we can. You better have at least one else we are
519 * going to bail out
520 */
521 err = use_all_metadata(ife);
522 if (err) {
523 if (ret == ACT_P_CREATED)
524 _tcf_ife_cleanup(a, bind);
525
526 spin_unlock_bh(&ife->tcf_lock);
527 return err;
528 }
529 }
530
531 spin_unlock_bh(&ife->tcf_lock);
532
533 if (ret == ACT_P_CREATED)
534 tcf_hash_insert(tn, a);
535
536 return ret;
537 }
538
539 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
540 int ref)
541 {
542 unsigned char *b = skb_tail_pointer(skb);
543 struct tcf_ife_info *ife = a->priv;
544 struct tc_ife opt = {
545 .index = ife->tcf_index,
546 .refcnt = ife->tcf_refcnt - ref,
547 .bindcnt = ife->tcf_bindcnt - bind,
548 .action = ife->tcf_action,
549 .flags = ife->flags,
550 };
551 struct tcf_t t;
552
553 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
554 goto nla_put_failure;
555
556 t.install = jiffies_to_clock_t(jiffies - ife->tcf_tm.install);
557 t.lastuse = jiffies_to_clock_t(jiffies - ife->tcf_tm.lastuse);
558 t.expires = jiffies_to_clock_t(ife->tcf_tm.expires);
559 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
560 goto nla_put_failure;
561
562 if (!is_zero_ether_addr(ife->eth_dst)) {
563 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
564 goto nla_put_failure;
565 }
566
567 if (!is_zero_ether_addr(ife->eth_src)) {
568 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
569 goto nla_put_failure;
570 }
571
572 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
573 goto nla_put_failure;
574
575 if (dump_metalist(skb, ife)) {
576 /*ignore failure to dump metalist */
577 pr_info("Failed to dump metalist\n");
578 }
579
580 return skb->len;
581
582 nla_put_failure:
583 nlmsg_trim(skb, b);
584 return -1;
585 }
586
587 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
588 u16 metaid, u16 mlen, void *mdata)
589 {
590 struct tcf_meta_info *e;
591
592 /* XXX: use hash to speed up */
593 list_for_each_entry(e, &ife->metalist, metalist) {
594 if (metaid == e->metaid) {
595 if (e->ops) {
596 /* We check for decode presence already */
597 return e->ops->decode(skb, mdata, mlen);
598 }
599 }
600 }
601
602 return 0;
603 }
604
605 struct ifeheadr {
606 __be16 metalen;
607 u8 tlv_data[];
608 };
609
610 struct meta_tlvhdr {
611 __be16 type;
612 __be16 len;
613 };
614
615 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
616 struct tcf_result *res)
617 {
618 struct tcf_ife_info *ife = a->priv;
619 int action = ife->tcf_action;
620 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
621 u16 ifehdrln = ifehdr->metalen;
622 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
623
624 spin_lock(&ife->tcf_lock);
625 bstats_update(&ife->tcf_bstats, skb);
626 ife->tcf_tm.lastuse = jiffies;
627 spin_unlock(&ife->tcf_lock);
628
629 ifehdrln = ntohs(ifehdrln);
630 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
631 spin_lock(&ife->tcf_lock);
632 ife->tcf_qstats.drops++;
633 spin_unlock(&ife->tcf_lock);
634 return TC_ACT_SHOT;
635 }
636
637 skb_set_mac_header(skb, ifehdrln);
638 __skb_pull(skb, ifehdrln);
639 skb->protocol = eth_type_trans(skb, skb->dev);
640 ifehdrln -= IFE_METAHDRLEN;
641
642 while (ifehdrln > 0) {
643 u8 *tlvdata = (u8 *)tlv;
644 u16 mtype = tlv->type;
645 u16 mlen = tlv->len;
646
647 mtype = ntohs(mtype);
648 mlen = ntohs(mlen);
649
650 if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
651 (void *)(tlvdata + 4))) {
652 /* abuse overlimits to count when we receive metadata
653 * but dont have an ops for it
654 */
655 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
656 mtype, mlen);
657 ife->tcf_qstats.overlimits++;
658 }
659
660 tlvdata += mlen;
661 ifehdrln -= mlen;
662 tlv = (struct meta_tlvhdr *)tlvdata;
663 }
664
665 skb_reset_network_header(skb);
666 return action;
667 }
668
669 /*XXX: check if we can do this at install time instead of current
670 * send data path
671 **/
672 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
673 {
674 struct tcf_meta_info *e, *n;
675 int tot_run_sz = 0, run_sz = 0;
676
677 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
678 if (e->ops->check_presence) {
679 run_sz = e->ops->check_presence(skb, e);
680 tot_run_sz += run_sz;
681 }
682 }
683
684 return tot_run_sz;
685 }
686
687 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
688 struct tcf_result *res)
689 {
690 struct tcf_ife_info *ife = a->priv;
691 int action = ife->tcf_action;
692 struct ethhdr *oethh; /* outer ether header */
693 struct ethhdr *iethh; /* inner eth header */
694 struct tcf_meta_info *e;
695 /*
696 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
697 where ORIGDATA = original ethernet header ...
698 */
699 u16 metalen = ife_get_sz(skb, ife);
700 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
701 unsigned int skboff = skb->dev->hard_header_len;
702 u32 at = G_TC_AT(skb->tc_verd);
703 int new_len = skb->len + hdrm;
704 bool exceed_mtu = false;
705 int err;
706
707 if (at & AT_EGRESS) {
708 if (new_len > skb->dev->mtu)
709 exceed_mtu = true;
710 }
711
712 spin_lock(&ife->tcf_lock);
713 bstats_update(&ife->tcf_bstats, skb);
714 ife->tcf_tm.lastuse = jiffies;
715
716 if (!metalen) { /* no metadata to send */
717 /* abuse overlimits to count when we allow packet
718 * with no metadata
719 */
720 ife->tcf_qstats.overlimits++;
721 spin_unlock(&ife->tcf_lock);
722 return action;
723 }
724 /* could be stupid policy setup or mtu config
725 * so lets be conservative.. */
726 if ((action == TC_ACT_SHOT) || exceed_mtu) {
727 ife->tcf_qstats.drops++;
728 spin_unlock(&ife->tcf_lock);
729 return TC_ACT_SHOT;
730 }
731
732 iethh = eth_hdr(skb);
733
734 err = skb_cow_head(skb, hdrm);
735 if (unlikely(err)) {
736 ife->tcf_qstats.drops++;
737 spin_unlock(&ife->tcf_lock);
738 return TC_ACT_SHOT;
739 }
740
741 if (!(at & AT_EGRESS))
742 skb_push(skb, skb->dev->hard_header_len);
743
744 __skb_push(skb, hdrm);
745 memcpy(skb->data, iethh, skb->mac_len);
746 skb_reset_mac_header(skb);
747 oethh = eth_hdr(skb);
748
749 /*total metadata length */
750 metalen += IFE_METAHDRLEN;
751 metalen = htons(metalen);
752 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
753 skboff += IFE_METAHDRLEN;
754
755 /* XXX: we dont have a clever way of telling encode to
756 * not repeat some of the computations that are done by
757 * ops->presence_check...
758 */
759 list_for_each_entry(e, &ife->metalist, metalist) {
760 if (e->ops->encode) {
761 err = e->ops->encode(skb, (void *)(skb->data + skboff),
762 e);
763 }
764 if (err < 0) {
765 /* too corrupt to keep around if overwritten */
766 ife->tcf_qstats.drops++;
767 spin_unlock(&ife->tcf_lock);
768 return TC_ACT_SHOT;
769 }
770 skboff += err;
771 }
772
773 if (!is_zero_ether_addr(ife->eth_src))
774 ether_addr_copy(oethh->h_source, ife->eth_src);
775 else
776 ether_addr_copy(oethh->h_source, iethh->h_source);
777 if (!is_zero_ether_addr(ife->eth_dst))
778 ether_addr_copy(oethh->h_dest, ife->eth_dst);
779 else
780 ether_addr_copy(oethh->h_dest, iethh->h_dest);
781 oethh->h_proto = htons(ife->eth_type);
782
783 if (!(at & AT_EGRESS))
784 skb_pull(skb, skb->dev->hard_header_len);
785
786 spin_unlock(&ife->tcf_lock);
787
788 return action;
789 }
790
791 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
792 struct tcf_result *res)
793 {
794 struct tcf_ife_info *ife = a->priv;
795
796 if (ife->flags & IFE_ENCODE)
797 return tcf_ife_encode(skb, a, res);
798
799 if (!(ife->flags & IFE_ENCODE))
800 return tcf_ife_decode(skb, a, res);
801
802 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
803 spin_lock(&ife->tcf_lock);
804 bstats_update(&ife->tcf_bstats, skb);
805 ife->tcf_tm.lastuse = jiffies;
806 ife->tcf_qstats.drops++;
807 spin_unlock(&ife->tcf_lock);
808
809 return TC_ACT_SHOT;
810 }
811
812 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
813 struct netlink_callback *cb, int type,
814 struct tc_action *a)
815 {
816 struct tc_action_net *tn = net_generic(net, ife_net_id);
817
818 return tcf_generic_walker(tn, skb, cb, type, a);
819 }
820
821 static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index)
822 {
823 struct tc_action_net *tn = net_generic(net, ife_net_id);
824
825 return tcf_hash_search(tn, a, index);
826 }
827
828 static struct tc_action_ops act_ife_ops = {
829 .kind = "ife",
830 .type = TCA_ACT_IFE,
831 .owner = THIS_MODULE,
832 .act = tcf_ife_act,
833 .dump = tcf_ife_dump,
834 .cleanup = tcf_ife_cleanup,
835 .init = tcf_ife_init,
836 .walk = tcf_ife_walker,
837 .lookup = tcf_ife_search,
838 };
839
840 static __net_init int ife_init_net(struct net *net)
841 {
842 struct tc_action_net *tn = net_generic(net, ife_net_id);
843
844 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
845 }
846
847 static void __net_exit ife_exit_net(struct net *net)
848 {
849 struct tc_action_net *tn = net_generic(net, ife_net_id);
850
851 tc_action_net_exit(tn);
852 }
853
854 static struct pernet_operations ife_net_ops = {
855 .init = ife_init_net,
856 .exit = ife_exit_net,
857 .id = &ife_net_id,
858 .size = sizeof(struct tc_action_net),
859 };
860
861 static int __init ife_init_module(void)
862 {
863 return tcf_register_action(&act_ife_ops, &ife_net_ops);
864 }
865
866 static void __exit ife_cleanup_module(void)
867 {
868 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
869 }
870
871 module_init(ife_init_module);
872 module_exit(ife_cleanup_module);
873
874 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
875 MODULE_DESCRIPTION("Inter-FE LFB action");
876 MODULE_LICENSE("GPL");
Linux with added FPC-III support