blob: c589a9ba506af8ba1376f48162ec8224281a48a0 [file] [log] [blame]
Jamal Hadi Salimef6980b2016-02-27 08:08:54 -05001/*
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
38static int ife_net_id;
39static int max_metacnt = IFE_META_MAX + 1;
40
41static 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*/
50int 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}
63EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
64
65int 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}
72EXPORT_SYMBOL_GPL(ife_get_meta_u32);
73
74int 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}
81EXPORT_SYMBOL_GPL(ife_check_meta_u32);
82
83int 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}
98EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
99
100int 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}
107EXPORT_SYMBOL_GPL(ife_get_meta_u16);
108
109int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval)
110{
WANG Congd1491fa2016-03-02 11:20:36 -0800111 mi->metaval = kmemdup(metaval, sizeof(u32), GFP_KERNEL);
Jamal Hadi Salimef6980b2016-02-27 08:08:54 -0500112 if (!mi->metaval)
113 return -ENOMEM;
114
115 return 0;
116}
117EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
118
119int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval)
120{
WANG Congd1491fa2016-03-02 11:20:36 -0800121 mi->metaval = kmemdup(metaval, sizeof(u16), GFP_KERNEL);
Jamal Hadi Salimef6980b2016-02-27 08:08:54 -0500122 if (!mi->metaval)
123 return -ENOMEM;
124
125 return 0;
126}
127EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
128
129void ife_release_meta_gen(struct tcf_meta_info *mi)
130{
131 kfree(mi->metaval);
132}
133EXPORT_SYMBOL_GPL(ife_release_meta_gen);
134
135int ife_validate_meta_u32(void *val, int len)
136{
137 if (len == 4)
138 return 0;
139
140 return -EINVAL;
141}
142EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
143
144int 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}
152EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
153
154static LIST_HEAD(ifeoplist);
155static DEFINE_RWLOCK(ife_mod_lock);
156
157static 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
175int 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}
201EXPORT_SYMBOL_GPL(unregister_ife_op);
202
203int 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}
220EXPORT_SYMBOL_GPL(register_ife_op);
221
222static 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*/
245static 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*/
277static 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
310static 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
328static 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
355out_nlmsg_trim:
356 nlmsg_trim(skb, b);
357 return -1;
358}
359
360/* under ife->tcf_lock */
361static 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
379static 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 */
389static 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
414static 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;
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 if (parm->flags & IFE_ENCODE) {
439 /* Until we get issued the ethertype, we cant have
440 * a default..
441 **/
442 if (!tb[TCA_IFE_TYPE]) {
443 pr_info("You MUST pass etherype for encoding\n");
444 return -EINVAL;
445 }
446 }
447
448 if (!tcf_hash_check(tn, parm->index, a, bind)) {
449 ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife),
450 bind, false);
451 if (ret)
452 return ret;
453 ret = ACT_P_CREATED;
454 } else {
455 if (bind) /* dont override defaults */
456 return 0;
457 tcf_hash_release(a, bind);
458 if (!ovr)
459 return -EEXIST;
460 }
461
462 ife = to_ife(a);
463 ife->flags = parm->flags;
464
465 if (parm->flags & IFE_ENCODE) {
466 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
467 if (tb[TCA_IFE_DMAC])
468 daddr = nla_data(tb[TCA_IFE_DMAC]);
469 if (tb[TCA_IFE_SMAC])
470 saddr = nla_data(tb[TCA_IFE_SMAC]);
471 }
472
473 spin_lock_bh(&ife->tcf_lock);
474 ife->tcf_action = parm->action;
475
476 if (parm->flags & IFE_ENCODE) {
477 if (daddr)
478 ether_addr_copy(ife->eth_dst, daddr);
479 else
480 eth_zero_addr(ife->eth_dst);
481
482 if (saddr)
483 ether_addr_copy(ife->eth_src, saddr);
484 else
485 eth_zero_addr(ife->eth_src);
486
487 ife->eth_type = ife_type;
488 }
489
490 if (ret == ACT_P_CREATED)
491 INIT_LIST_HEAD(&ife->metalist);
492
493 if (tb[TCA_IFE_METALST]) {
494 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
495 NULL);
496 if (err) {
497metadata_parse_err:
498 if (ret == ACT_P_CREATED)
499 _tcf_ife_cleanup(a, bind);
500
501 spin_unlock_bh(&ife->tcf_lock);
502 return err;
503 }
504
505 err = populate_metalist(ife, tb2);
506 if (err)
507 goto metadata_parse_err;
508
509 } else {
510 /* if no passed metadata allow list or passed allow-all
511 * then here we process by adding as many supported metadatum
512 * as we can. You better have at least one else we are
513 * going to bail out
514 */
515 err = use_all_metadata(ife);
516 if (err) {
517 if (ret == ACT_P_CREATED)
518 _tcf_ife_cleanup(a, bind);
519
520 spin_unlock_bh(&ife->tcf_lock);
521 return err;
522 }
523 }
524
525 spin_unlock_bh(&ife->tcf_lock);
526
527 if (ret == ACT_P_CREATED)
528 tcf_hash_insert(tn, a);
529
530 return ret;
531}
532
533static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
534 int ref)
535{
536 unsigned char *b = skb_tail_pointer(skb);
537 struct tcf_ife_info *ife = a->priv;
538 struct tc_ife opt = {
539 .index = ife->tcf_index,
540 .refcnt = ife->tcf_refcnt - ref,
541 .bindcnt = ife->tcf_bindcnt - bind,
542 .action = ife->tcf_action,
543 .flags = ife->flags,
544 };
545 struct tcf_t t;
546
547 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
548 goto nla_put_failure;
549
550 t.install = jiffies_to_clock_t(jiffies - ife->tcf_tm.install);
551 t.lastuse = jiffies_to_clock_t(jiffies - ife->tcf_tm.lastuse);
552 t.expires = jiffies_to_clock_t(ife->tcf_tm.expires);
553 if (nla_put(skb, TCA_IFE_TM, sizeof(t), &t))
554 goto nla_put_failure;
555
556 if (!is_zero_ether_addr(ife->eth_dst)) {
557 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
558 goto nla_put_failure;
559 }
560
561 if (!is_zero_ether_addr(ife->eth_src)) {
562 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
563 goto nla_put_failure;
564 }
565
566 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
567 goto nla_put_failure;
568
569 if (dump_metalist(skb, ife)) {
570 /*ignore failure to dump metalist */
571 pr_info("Failed to dump metalist\n");
572 }
573
574 return skb->len;
575
576nla_put_failure:
577 nlmsg_trim(skb, b);
578 return -1;
579}
580
581int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
582 u16 metaid, u16 mlen, void *mdata)
583{
584 struct tcf_meta_info *e;
585
586 /* XXX: use hash to speed up */
587 list_for_each_entry(e, &ife->metalist, metalist) {
588 if (metaid == e->metaid) {
589 if (e->ops) {
590 /* We check for decode presence already */
591 return e->ops->decode(skb, mdata, mlen);
592 }
593 }
594 }
595
596 return 0;
597}
598
599struct ifeheadr {
600 __be16 metalen;
601 u8 tlv_data[];
602};
603
604struct meta_tlvhdr {
605 __be16 type;
606 __be16 len;
607};
608
609static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
610 struct tcf_result *res)
611{
612 struct tcf_ife_info *ife = a->priv;
613 int action = ife->tcf_action;
614 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
615 u16 ifehdrln = ifehdr->metalen;
616 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
617
618 spin_lock(&ife->tcf_lock);
619 bstats_update(&ife->tcf_bstats, skb);
620 ife->tcf_tm.lastuse = jiffies;
621 spin_unlock(&ife->tcf_lock);
622
623 ifehdrln = ntohs(ifehdrln);
624 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
625 spin_lock(&ife->tcf_lock);
626 ife->tcf_qstats.drops++;
627 spin_unlock(&ife->tcf_lock);
628 return TC_ACT_SHOT;
629 }
630
631 skb_set_mac_header(skb, ifehdrln);
632 __skb_pull(skb, ifehdrln);
633 skb->protocol = eth_type_trans(skb, skb->dev);
634 ifehdrln -= IFE_METAHDRLEN;
635
636 while (ifehdrln > 0) {
637 u8 *tlvdata = (u8 *)tlv;
638 u16 mtype = tlv->type;
639 u16 mlen = tlv->len;
640
641 mtype = ntohs(mtype);
642 mlen = ntohs(mlen);
643
644 if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
645 (void *)(tlvdata + 4))) {
646 /* abuse overlimits to count when we receive metadata
647 * but dont have an ops for it
648 */
649 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
650 mtype, mlen);
651 ife->tcf_qstats.overlimits++;
652 }
653
654 tlvdata += mlen;
655 ifehdrln -= mlen;
656 tlv = (struct meta_tlvhdr *)tlvdata;
657 }
658
659 skb_reset_network_header(skb);
660 return action;
661}
662
663/*XXX: check if we can do this at install time instead of current
664 * send data path
665**/
666static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
667{
668 struct tcf_meta_info *e, *n;
669 int tot_run_sz = 0, run_sz = 0;
670
671 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
672 if (e->ops->check_presence) {
673 run_sz = e->ops->check_presence(skb, e);
674 tot_run_sz += run_sz;
675 }
676 }
677
678 return tot_run_sz;
679}
680
681static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
682 struct tcf_result *res)
683{
684 struct tcf_ife_info *ife = a->priv;
685 int action = ife->tcf_action;
686 struct ethhdr *oethh; /* outer ether header */
687 struct ethhdr *iethh; /* inner eth header */
688 struct tcf_meta_info *e;
689 /*
690 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
691 where ORIGDATA = original ethernet header ...
692 */
693 u16 metalen = ife_get_sz(skb, ife);
694 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
695 unsigned int skboff = skb->dev->hard_header_len;
696 u32 at = G_TC_AT(skb->tc_verd);
697 int new_len = skb->len + hdrm;
698 bool exceed_mtu = false;
699 int err;
700
701 if (at & AT_EGRESS) {
702 if (new_len > skb->dev->mtu)
703 exceed_mtu = true;
704 }
705
706 spin_lock(&ife->tcf_lock);
707 bstats_update(&ife->tcf_bstats, skb);
708 ife->tcf_tm.lastuse = jiffies;
709
710 if (!metalen) { /* no metadata to send */
711 /* abuse overlimits to count when we allow packet
712 * with no metadata
713 */
714 ife->tcf_qstats.overlimits++;
715 spin_unlock(&ife->tcf_lock);
716 return action;
717 }
718 /* could be stupid policy setup or mtu config
719 * so lets be conservative.. */
720 if ((action == TC_ACT_SHOT) || exceed_mtu) {
721 ife->tcf_qstats.drops++;
722 spin_unlock(&ife->tcf_lock);
723 return TC_ACT_SHOT;
724 }
725
726 iethh = eth_hdr(skb);
727
728 err = skb_cow_head(skb, hdrm);
729 if (unlikely(err)) {
730 ife->tcf_qstats.drops++;
731 spin_unlock(&ife->tcf_lock);
732 return TC_ACT_SHOT;
733 }
734
735 if (!(at & AT_EGRESS))
736 skb_push(skb, skb->dev->hard_header_len);
737
738 __skb_push(skb, hdrm);
739 memcpy(skb->data, iethh, skb->mac_len);
740 skb_reset_mac_header(skb);
741 oethh = eth_hdr(skb);
742
743 /*total metadata length */
744 metalen += IFE_METAHDRLEN;
745 metalen = htons(metalen);
746 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
747 skboff += IFE_METAHDRLEN;
748
749 /* XXX: we dont have a clever way of telling encode to
750 * not repeat some of the computations that are done by
751 * ops->presence_check...
752 */
753 list_for_each_entry(e, &ife->metalist, metalist) {
754 if (e->ops->encode) {
755 err = e->ops->encode(skb, (void *)(skb->data + skboff),
756 e);
757 }
758 if (err < 0) {
759 /* too corrupt to keep around if overwritten */
760 ife->tcf_qstats.drops++;
761 spin_unlock(&ife->tcf_lock);
762 return TC_ACT_SHOT;
763 }
764 skboff += err;
765 }
766
767 if (!is_zero_ether_addr(ife->eth_src))
768 ether_addr_copy(oethh->h_source, ife->eth_src);
769 else
770 ether_addr_copy(oethh->h_source, iethh->h_source);
771 if (!is_zero_ether_addr(ife->eth_dst))
772 ether_addr_copy(oethh->h_dest, ife->eth_dst);
773 else
774 ether_addr_copy(oethh->h_dest, iethh->h_dest);
775 oethh->h_proto = htons(ife->eth_type);
776
777 if (!(at & AT_EGRESS))
778 skb_pull(skb, skb->dev->hard_header_len);
779
780 spin_unlock(&ife->tcf_lock);
781
782 return action;
783}
784
785static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
786 struct tcf_result *res)
787{
788 struct tcf_ife_info *ife = a->priv;
789
790 if (ife->flags & IFE_ENCODE)
791 return tcf_ife_encode(skb, a, res);
792
793 if (!(ife->flags & IFE_ENCODE))
794 return tcf_ife_decode(skb, a, res);
795
796 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
797 spin_lock(&ife->tcf_lock);
798 bstats_update(&ife->tcf_bstats, skb);
799 ife->tcf_tm.lastuse = jiffies;
800 ife->tcf_qstats.drops++;
801 spin_unlock(&ife->tcf_lock);
802
803 return TC_ACT_SHOT;
804}
805
806static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
807 struct netlink_callback *cb, int type,
808 struct tc_action *a)
809{
810 struct tc_action_net *tn = net_generic(net, ife_net_id);
811
812 return tcf_generic_walker(tn, skb, cb, type, a);
813}
814
815static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index)
816{
817 struct tc_action_net *tn = net_generic(net, ife_net_id);
818
819 return tcf_hash_search(tn, a, index);
820}
821
822static struct tc_action_ops act_ife_ops = {
823 .kind = "ife",
824 .type = TCA_ACT_IFE,
825 .owner = THIS_MODULE,
826 .act = tcf_ife_act,
827 .dump = tcf_ife_dump,
828 .cleanup = tcf_ife_cleanup,
829 .init = tcf_ife_init,
830 .walk = tcf_ife_walker,
831 .lookup = tcf_ife_search,
832};
833
834static __net_init int ife_init_net(struct net *net)
835{
836 struct tc_action_net *tn = net_generic(net, ife_net_id);
837
838 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
839}
840
841static void __net_exit ife_exit_net(struct net *net)
842{
843 struct tc_action_net *tn = net_generic(net, ife_net_id);
844
845 tc_action_net_exit(tn);
846}
847
848static struct pernet_operations ife_net_ops = {
849 .init = ife_init_net,
850 .exit = ife_exit_net,
851 .id = &ife_net_id,
852 .size = sizeof(struct tc_action_net),
853};
854
855static int __init ife_init_module(void)
856{
857 return tcf_register_action(&act_ife_ops, &ife_net_ops);
858}
859
860static void __exit ife_cleanup_module(void)
861{
862 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
863}
864
865module_init(ife_init_module);
866module_exit(ife_cleanup_module);
867
868MODULE_AUTHOR("Jamal Hadi Salim(2015)");
869MODULE_DESCRIPTION("Inter-FE LFB action");
870MODULE_LICENSE("GPL");