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net_sched: make tcf_hash_check() boolean
[linux/fpc-iii.git] / net / sched / act_ife.c
blobb7fa96926c90447d49cb534262c43cd92f02041f
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 bool exists = false;
427 int ret = 0;
428 int err;
429
430 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
431 if (err < 0)
432 return err;
433
434 if (!tb[TCA_IFE_PARMS])
435 return -EINVAL;
436
437 parm = nla_data(tb[TCA_IFE_PARMS]);
438
439 exists = tcf_hash_check(tn, parm->index, a, bind);
440 if (exists && bind)
441 return 0;
442
443 if (parm->flags & IFE_ENCODE) {
444 /* Until we get issued the ethertype, we cant have
445 * a default..
446 **/
447 if (!tb[TCA_IFE_TYPE]) {
448 if (exists)
449 tcf_hash_release(a, bind);
450 pr_info("You MUST pass etherype for encoding\n");
451 return -EINVAL;
452 }
453 }
454
455 if (!exists) {
456 ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife),
457 bind, false);
458 if (ret)
459 return ret;
460 ret = ACT_P_CREATED;
461 } else {
462 tcf_hash_release(a, bind);
463 if (!ovr)
464 return -EEXIST;
465 }
466
467 ife = to_ife(a);
468 ife->flags = parm->flags;
469
470 if (parm->flags & IFE_ENCODE) {
471 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
472 if (tb[TCA_IFE_DMAC])
473 daddr = nla_data(tb[TCA_IFE_DMAC]);
474 if (tb[TCA_IFE_SMAC])
475 saddr = nla_data(tb[TCA_IFE_SMAC]);
476 }
477
478 spin_lock_bh(&ife->tcf_lock);
479 ife->tcf_action = parm->action;
480
481 if (parm->flags & IFE_ENCODE) {
482 if (daddr)
483 ether_addr_copy(ife->eth_dst, daddr);
484 else
485 eth_zero_addr(ife->eth_dst);
486
487 if (saddr)
488 ether_addr_copy(ife->eth_src, saddr);
489 else
490 eth_zero_addr(ife->eth_src);
491
492 ife->eth_type = ife_type;
493 }
494
495 if (ret == ACT_P_CREATED)
496 INIT_LIST_HEAD(&ife->metalist);
497
498 if (tb[TCA_IFE_METALST]) {
499 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
500 NULL);
501 if (err) {
502 metadata_parse_err:
503 if (exists)
504 tcf_hash_release(a, bind);
505 if (ret == ACT_P_CREATED)
506 _tcf_ife_cleanup(a, bind);
507
508 spin_unlock_bh(&ife->tcf_lock);
509 return err;
510 }
511
512 err = populate_metalist(ife, tb2);
513 if (err)
514 goto metadata_parse_err;
515
516 } else {
517 /* if no passed metadata allow list or passed allow-all
518 * then here we process by adding as many supported metadatum
519 * as we can. You better have at least one else we are
520 * going to bail out
521 */
522 err = use_all_metadata(ife);
523 if (err) {
524 if (ret == ACT_P_CREATED)
525 _tcf_ife_cleanup(a, bind);
526
527 spin_unlock_bh(&ife->tcf_lock);
528 return err;
529 }
530 }
531
532 spin_unlock_bh(&ife->tcf_lock);
533
534 if (ret == ACT_P_CREATED)
535 tcf_hash_insert(tn, a);
536
537 return ret;
538 }
539
540 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
541 int ref)
542 {
543 unsigned char *b = skb_tail_pointer(skb);
544 struct tcf_ife_info *ife = a->priv;
545 struct tc_ife opt = {
546 .index = ife->tcf_index,
547 .refcnt = ife->tcf_refcnt - ref,
548 .bindcnt = ife->tcf_bindcnt - bind,
549 .action = ife->tcf_action,
550 .flags = ife->flags,
551 };
552 struct tcf_t t;
553
554 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
555 goto nla_put_failure;
556
557 tcf_tm_dump(&t, &ife->tcf_tm);
558 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
559 goto nla_put_failure;
560
561 if (!is_zero_ether_addr(ife->eth_dst)) {
562 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
563 goto nla_put_failure;
564 }
565
566 if (!is_zero_ether_addr(ife->eth_src)) {
567 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
568 goto nla_put_failure;
569 }
570
571 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
572 goto nla_put_failure;
573
574 if (dump_metalist(skb, ife)) {
575 /*ignore failure to dump metalist */
576 pr_info("Failed to dump metalist\n");
577 }
578
579 return skb->len;
580
581 nla_put_failure:
582 nlmsg_trim(skb, b);
583 return -1;
584 }
585
586 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
587 u16 metaid, u16 mlen, void *mdata)
588 {
589 struct tcf_meta_info *e;
590
591 /* XXX: use hash to speed up */
592 list_for_each_entry(e, &ife->metalist, metalist) {
593 if (metaid == e->metaid) {
594 if (e->ops) {
595 /* We check for decode presence already */
596 return e->ops->decode(skb, mdata, mlen);
597 }
598 }
599 }
600
601 return 0;
602 }
603
604 struct ifeheadr {
605 __be16 metalen;
606 u8 tlv_data[];
607 };
608
609 struct meta_tlvhdr {
610 __be16 type;
611 __be16 len;
612 };
613
614 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
615 struct tcf_result *res)
616 {
617 struct tcf_ife_info *ife = a->priv;
618 int action = ife->tcf_action;
619 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
620 u16 ifehdrln = ifehdr->metalen;
621 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
622
623 spin_lock(&ife->tcf_lock);
624 bstats_update(&ife->tcf_bstats, skb);
625 tcf_lastuse_update(&ife->tcf_tm);
626 spin_unlock(&ife->tcf_lock);
627
628 ifehdrln = ntohs(ifehdrln);
629 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
630 spin_lock(&ife->tcf_lock);
631 ife->tcf_qstats.drops++;
632 spin_unlock(&ife->tcf_lock);
633 return TC_ACT_SHOT;
634 }
635
636 skb_set_mac_header(skb, ifehdrln);
637 __skb_pull(skb, ifehdrln);
638 skb->protocol = eth_type_trans(skb, skb->dev);
639 ifehdrln -= IFE_METAHDRLEN;
640
641 while (ifehdrln > 0) {
642 u8 *tlvdata = (u8 *)tlv;
643 u16 mtype = tlv->type;
644 u16 mlen = tlv->len;
645
646 mtype = ntohs(mtype);
647 mlen = ntohs(mlen);
648
649 if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
650 (void *)(tlvdata + 4))) {
651 /* abuse overlimits to count when we receive metadata
652 * but dont have an ops for it
653 */
654 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
655 mtype, mlen);
656 ife->tcf_qstats.overlimits++;
657 }
658
659 tlvdata += mlen;
660 ifehdrln -= mlen;
661 tlv = (struct meta_tlvhdr *)tlvdata;
662 }
663
664 skb_reset_network_header(skb);
665 return action;
666 }
667
668 /*XXX: check if we can do this at install time instead of current
669 * send data path
670 **/
671 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
672 {
673 struct tcf_meta_info *e, *n;
674 int tot_run_sz = 0, run_sz = 0;
675
676 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
677 if (e->ops->check_presence) {
678 run_sz = e->ops->check_presence(skb, e);
679 tot_run_sz += run_sz;
680 }
681 }
682
683 return tot_run_sz;
684 }
685
686 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
687 struct tcf_result *res)
688 {
689 struct tcf_ife_info *ife = a->priv;
690 int action = ife->tcf_action;
691 struct ethhdr *oethh; /* outer ether header */
692 struct ethhdr *iethh; /* inner eth header */
693 struct tcf_meta_info *e;
694 /*
695 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
696 where ORIGDATA = original ethernet header ...
697 */
698 u16 metalen = ife_get_sz(skb, ife);
699 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
700 unsigned int skboff = skb->dev->hard_header_len;
701 u32 at = G_TC_AT(skb->tc_verd);
702 int new_len = skb->len + hdrm;
703 bool exceed_mtu = false;
704 int err;
705
706 if (at & AT_EGRESS) {
707 if (new_len > skb->dev->mtu)
708 exceed_mtu = true;
709 }
710
711 spin_lock(&ife->tcf_lock);
712 bstats_update(&ife->tcf_bstats, skb);
713 tcf_lastuse_update(&ife->tcf_tm);
714
715 if (!metalen) { /* no metadata to send */
716 /* abuse overlimits to count when we allow packet
717 * with no metadata
718 */
719 ife->tcf_qstats.overlimits++;
720 spin_unlock(&ife->tcf_lock);
721 return action;
722 }
723 /* could be stupid policy setup or mtu config
724 * so lets be conservative.. */
725 if ((action == TC_ACT_SHOT) || exceed_mtu) {
726 ife->tcf_qstats.drops++;
727 spin_unlock(&ife->tcf_lock);
728 return TC_ACT_SHOT;
729 }
730
731 iethh = eth_hdr(skb);
732
733 err = skb_cow_head(skb, hdrm);
734 if (unlikely(err)) {
735 ife->tcf_qstats.drops++;
736 spin_unlock(&ife->tcf_lock);
737 return TC_ACT_SHOT;
738 }
739
740 if (!(at & AT_EGRESS))
741 skb_push(skb, skb->dev->hard_header_len);
742
743 __skb_push(skb, hdrm);
744 memcpy(skb->data, iethh, skb->mac_len);
745 skb_reset_mac_header(skb);
746 oethh = eth_hdr(skb);
747
748 /*total metadata length */
749 metalen += IFE_METAHDRLEN;
750 metalen = htons(metalen);
751 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
752 skboff += IFE_METAHDRLEN;
753
754 /* XXX: we dont have a clever way of telling encode to
755 * not repeat some of the computations that are done by
756 * ops->presence_check...
757 */
758 list_for_each_entry(e, &ife->metalist, metalist) {
759 if (e->ops->encode) {
760 err = e->ops->encode(skb, (void *)(skb->data + skboff),
761 e);
762 }
763 if (err < 0) {
764 /* too corrupt to keep around if overwritten */
765 ife->tcf_qstats.drops++;
766 spin_unlock(&ife->tcf_lock);
767 return TC_ACT_SHOT;
768 }
769 skboff += err;
770 }
771
772 if (!is_zero_ether_addr(ife->eth_src))
773 ether_addr_copy(oethh->h_source, ife->eth_src);
774 else
775 ether_addr_copy(oethh->h_source, iethh->h_source);
776 if (!is_zero_ether_addr(ife->eth_dst))
777 ether_addr_copy(oethh->h_dest, ife->eth_dst);
778 else
779 ether_addr_copy(oethh->h_dest, iethh->h_dest);
780 oethh->h_proto = htons(ife->eth_type);
781
782 if (!(at & AT_EGRESS))
783 skb_pull(skb, skb->dev->hard_header_len);
784
785 spin_unlock(&ife->tcf_lock);
786
787 return action;
788 }
789
790 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
791 struct tcf_result *res)
792 {
793 struct tcf_ife_info *ife = a->priv;
794
795 if (ife->flags & IFE_ENCODE)
796 return tcf_ife_encode(skb, a, res);
797
798 if (!(ife->flags & IFE_ENCODE))
799 return tcf_ife_decode(skb, a, res);
800
801 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
802 spin_lock(&ife->tcf_lock);
803 bstats_update(&ife->tcf_bstats, skb);
804 tcf_lastuse_update(&ife->tcf_tm);
805 ife->tcf_qstats.drops++;
806 spin_unlock(&ife->tcf_lock);
807
808 return TC_ACT_SHOT;
809 }
810
811 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
812 struct netlink_callback *cb, int type,
813 struct tc_action *a)
814 {
815 struct tc_action_net *tn = net_generic(net, ife_net_id);
816
817 return tcf_generic_walker(tn, skb, cb, type, a);
818 }
819
820 static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index)
821 {
822 struct tc_action_net *tn = net_generic(net, ife_net_id);
823
824 return tcf_hash_search(tn, a, index);
825 }
826
827 static struct tc_action_ops act_ife_ops = {
828 .kind = "ife",
829 .type = TCA_ACT_IFE,
830 .owner = THIS_MODULE,
831 .act = tcf_ife_act,
832 .dump = tcf_ife_dump,
833 .cleanup = tcf_ife_cleanup,
834 .init = tcf_ife_init,
835 .walk = tcf_ife_walker,
836 .lookup = tcf_ife_search,
837 };
838
839 static __net_init int ife_init_net(struct net *net)
840 {
841 struct tc_action_net *tn = net_generic(net, ife_net_id);
842
843 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
844 }
845
846 static void __net_exit ife_exit_net(struct net *net)
847 {
848 struct tc_action_net *tn = net_generic(net, ife_net_id);
849
850 tc_action_net_exit(tn);
851 }
852
853 static struct pernet_operations ife_net_ops = {
854 .init = ife_init_net,
855 .exit = ife_exit_net,
856 .id = &ife_net_id,
857 .size = sizeof(struct tc_action_net),
858 };
859
860 static int __init ife_init_module(void)
861 {
862 return tcf_register_action(&act_ife_ops, &ife_net_ops);
863 }
864
865 static void __exit ife_cleanup_module(void)
866 {
867 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
868 }
869
870 module_init(ife_init_module);
871 module_exit(ife_cleanup_module);
872
873 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
874 MODULE_DESCRIPTION("Inter-FE LFB action");
875 MODULE_LICENSE("GPL");
Linux with added FPC-III support