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ipvlan: Scrub skb before crossing the namespace boundry
[deliverable/linux.git] / net / sched / act_ife.c
CommitLineData
ef6980b6
JHS		 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
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
067a7cd0 109int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
ef6980b6 110{
067a7cd0 111 mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
ef6980b6
JHS		 112 if (!mi->metaval)
113 return -ENOMEM;
114
115 return 0;
116}
117EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
118
067a7cd0 119int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
ef6980b6 120{
067a7cd0 121 mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
ef6980b6
JHS		 122 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
067a7cd0 243 * under ife->tcf_lock for existing action
ef6980b6
JHS		 244*/
245static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
067a7cd0 246 void *val, int len, bool exists)
ef6980b6
JHS		 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
067a7cd0
WC		 254 if (exists)
255 spin_unlock_bh(&ife->tcf_lock);
ef6980b6
JHS		 256 rtnl_unlock();
257 request_module("ifemeta%u", metaid);
258 rtnl_lock();
067a7cd0
WC		 259 if (exists)
260 spin_lock_bh(&ife->tcf_lock);
ef6980b6
JHS		 261 ops = find_ife_oplist(metaid);
262#endif
263 }
264
265 if (ops) {
266 ret = 0;
267 if (len)
268 ret = ife_validate_metatype(ops, val, len);
269
270 module_put(ops->owner);
271 }
272
273 return ret;
274}
275
276/* called when adding new meta information
067a7cd0 277 * under ife->tcf_lock for existing action
ef6980b6
JHS		 278*/
279static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
817e9f2c 280 int len, bool atomic)
ef6980b6
JHS		 281{
282 struct tcf_meta_info *mi = NULL;
283 struct tcf_meta_ops *ops = find_ife_oplist(metaid);
284 int ret = 0;
285
286 if (!ops)
287 return -ENOENT;
288
817e9f2c 289 mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
ef6980b6
JHS		 290 if (!mi) {
291 /*put back what find_ife_oplist took */
292 module_put(ops->owner);
293 return -ENOMEM;
294 }
295
296 mi->metaid = metaid;
297 mi->ops = ops;
298 if (len > 0) {
817e9f2c 299 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
ef6980b6
JHS		 300 if (ret != 0) {
301 kfree(mi);
302 module_put(ops->owner);
303 return ret;
304 }
305 }
306
307 list_add_tail(&mi->metalist, &ife->metalist);
308
309 return ret;
310}
311
312static int use_all_metadata(struct tcf_ife_info *ife)
313{
314 struct tcf_meta_ops *o;
315 int rc = 0;
316 int installed = 0;
317
817e9f2c 318 read_lock(&ife_mod_lock);
ef6980b6 319 list_for_each_entry(o, &ifeoplist, list) {
817e9f2c 320 rc = add_metainfo(ife, o->metaid, NULL, 0, true);
ef6980b6
JHS		 321 if (rc == 0)
322 installed += 1;
323 }
817e9f2c 324 read_unlock(&ife_mod_lock);
ef6980b6
JHS		 325
326 if (installed)
327 return 0;
328 else
329 return -EINVAL;
330}
331
332static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
333{
334 struct tcf_meta_info *e;
335 struct nlattr *nest;
336 unsigned char *b = skb_tail_pointer(skb);
337 int total_encoded = 0;
338
339 /*can only happen on decode */
340 if (list_empty(&ife->metalist))
341 return 0;
342
343 nest = nla_nest_start(skb, TCA_IFE_METALST);
344 if (!nest)
345 goto out_nlmsg_trim;
346
347 list_for_each_entry(e, &ife->metalist, metalist) {
348 if (!e->ops->get(skb, e))
349 total_encoded += 1;
350 }
351
352 if (!total_encoded)
353 goto out_nlmsg_trim;
354
355 nla_nest_end(skb, nest);
356
357 return 0;
358
359out_nlmsg_trim:
360 nlmsg_trim(skb, b);
361 return -1;
362}
363
364/* under ife->tcf_lock */
365static void _tcf_ife_cleanup(struct tc_action *a, int bind)
366{
367 struct tcf_ife_info *ife = a->priv;
368 struct tcf_meta_info *e, *n;
369
370 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
371 module_put(e->ops->owner);
372 list_del(&e->metalist);
373 if (e->metaval) {
374 if (e->ops->release)
375 e->ops->release(e);
376 else
377 kfree(e->metaval);
378 }
379 kfree(e);
380 }
381}
382
383static void tcf_ife_cleanup(struct tc_action *a, int bind)
384{
385 struct tcf_ife_info *ife = a->priv;
386
387 spin_lock_bh(&ife->tcf_lock);
388 _tcf_ife_cleanup(a, bind);
389 spin_unlock_bh(&ife->tcf_lock);
390}
391
067a7cd0
WC		 392/* under ife->tcf_lock for existing action */
393static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
394 bool exists)
ef6980b6
JHS		 395{
396 int len = 0;
397 int rc = 0;
398 int i = 0;
399 void *val;
400
401 for (i = 1; i < max_metacnt; i++) {
402 if (tb[i]) {
403 val = nla_data(tb[i]);
404 len = nla_len(tb[i]);
405
067a7cd0 406 rc = load_metaops_and_vet(ife, i, val, len, exists);
ef6980b6
JHS		 407 if (rc != 0)
408 return rc;
409
067a7cd0 410 rc = add_metainfo(ife, i, val, len, exists);
ef6980b6
JHS		 411 if (rc)
412 return rc;
413 }
414 }
415
416 return rc;
417}
418
419static int tcf_ife_init(struct net *net, struct nlattr *nla,
420 struct nlattr *est, struct tc_action *a,
421 int ovr, int bind)
422{
423 struct tc_action_net *tn = net_generic(net, ife_net_id);
424 struct nlattr *tb[TCA_IFE_MAX + 1];
425 struct nlattr *tb2[IFE_META_MAX + 1];
426 struct tcf_ife_info *ife;
427 struct tc_ife *parm;
428 u16 ife_type = 0;
429 u8 *daddr = NULL;
430 u8 *saddr = NULL;
b2313077
WC		 431 bool exists = false;
432 int ret = 0;
ef6980b6
JHS		 433 int err;
434
435 err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
436 if (err < 0)
437 return err;
438
439 if (!tb[TCA_IFE_PARMS])
440 return -EINVAL;
441
442 parm = nla_data(tb[TCA_IFE_PARMS]);
443
4e8c8615
JHS		 444 exists = tcf_hash_check(tn, parm->index, a, bind);
445 if (exists && bind)
446 return 0;
447
ef6980b6
JHS		 448 if (parm->flags & IFE_ENCODE) {
449 /* Until we get issued the ethertype, we cant have
450 * a default..
451 **/
452 if (!tb[TCA_IFE_TYPE]) {
4e8c8615
JHS		 453 if (exists)
454 tcf_hash_release(a, bind);
ef6980b6
JHS		 455 pr_info("You MUST pass etherype for encoding\n");
456 return -EINVAL;
457 }
458 }
459
4e8c8615 460 if (!exists) {
ef6980b6
JHS		 461 ret = tcf_hash_create(tn, parm->index, est, a, sizeof(*ife),
462 bind, false);
463 if (ret)
464 return ret;
465 ret = ACT_P_CREATED;
466 } else {
ef6980b6
JHS		 467 tcf_hash_release(a, bind);
468 if (!ovr)
469 return -EEXIST;
470 }
471
472 ife = to_ife(a);
473 ife->flags = parm->flags;
474
475 if (parm->flags & IFE_ENCODE) {
476 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
477 if (tb[TCA_IFE_DMAC])
478 daddr = nla_data(tb[TCA_IFE_DMAC]);
479 if (tb[TCA_IFE_SMAC])
480 saddr = nla_data(tb[TCA_IFE_SMAC]);
481 }
482
067a7cd0
WC		 483 if (exists)
484 spin_lock_bh(&ife->tcf_lock);
ef6980b6
JHS		 485 ife->tcf_action = parm->action;
486
487 if (parm->flags & IFE_ENCODE) {
488 if (daddr)
489 ether_addr_copy(ife->eth_dst, daddr);
490 else
491 eth_zero_addr(ife->eth_dst);
492
493 if (saddr)
494 ether_addr_copy(ife->eth_src, saddr);
495 else
496 eth_zero_addr(ife->eth_src);
497
498 ife->eth_type = ife_type;
499 }
500
501 if (ret == ACT_P_CREATED)
502 INIT_LIST_HEAD(&ife->metalist);
503
504 if (tb[TCA_IFE_METALST]) {
505 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
506 NULL);
507 if (err) {
508metadata_parse_err:
4e8c8615
JHS		 509 if (exists)
510 tcf_hash_release(a, bind);
ef6980b6
JHS		 511 if (ret == ACT_P_CREATED)
512 _tcf_ife_cleanup(a, bind);
513
067a7cd0
WC		 514 if (exists)
515 spin_unlock_bh(&ife->tcf_lock);
ef6980b6
JHS		 516 return err;
517 }
518
067a7cd0 519 err = populate_metalist(ife, tb2, exists);
ef6980b6
JHS		 520 if (err)
521 goto metadata_parse_err;
522
523 } else {
524 /* if no passed metadata allow list or passed allow-all
525 * then here we process by adding as many supported metadatum
526 * as we can. You better have at least one else we are
527 * going to bail out
528 */
529 err = use_all_metadata(ife);
530 if (err) {
531 if (ret == ACT_P_CREATED)
532 _tcf_ife_cleanup(a, bind);
533
067a7cd0
WC		 534 if (exists)
535 spin_unlock_bh(&ife->tcf_lock);
ef6980b6
JHS		 536 return err;
537 }
538 }
539
067a7cd0
WC		 540 if (exists)
541 spin_unlock_bh(&ife->tcf_lock);
ef6980b6
JHS		 542
543 if (ret == ACT_P_CREATED)
544 tcf_hash_insert(tn, a);
545
546 return ret;
547}
548
549static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
550 int ref)
551{
552 unsigned char *b = skb_tail_pointer(skb);
553 struct tcf_ife_info *ife = a->priv;
554 struct tc_ife opt = {
555 .index = ife->tcf_index,
556 .refcnt = ife->tcf_refcnt - ref,
557 .bindcnt = ife->tcf_bindcnt - bind,
558 .action = ife->tcf_action,
559 .flags = ife->flags,
560 };
561 struct tcf_t t;
562
563 if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
564 goto nla_put_failure;
565
48d8ee16 566 tcf_tm_dump(&t, &ife->tcf_tm);
9854518e 567 if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
ef6980b6
JHS		 568 goto nla_put_failure;
569
570 if (!is_zero_ether_addr(ife->eth_dst)) {
571 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
572 goto nla_put_failure;
573 }
574
575 if (!is_zero_ether_addr(ife->eth_src)) {
576 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
577 goto nla_put_failure;
578 }
579
580 if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
581 goto nla_put_failure;
582
583 if (dump_metalist(skb, ife)) {
584 /*ignore failure to dump metalist */
585 pr_info("Failed to dump metalist\n");
586 }
587
588 return skb->len;
589
590nla_put_failure:
591 nlmsg_trim(skb, b);
592 return -1;
593}
594
595int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
596 u16 metaid, u16 mlen, void *mdata)
597{
598 struct tcf_meta_info *e;
599
600 /* XXX: use hash to speed up */
601 list_for_each_entry(e, &ife->metalist, metalist) {
602 if (metaid == e->metaid) {
603 if (e->ops) {
604 /* We check for decode presence already */
605 return e->ops->decode(skb, mdata, mlen);
606 }
607 }
608 }
609
610 return 0;
611}
612
613struct ifeheadr {
614 __be16 metalen;
615 u8 tlv_data[];
616};
617
618struct meta_tlvhdr {
619 __be16 type;
620 __be16 len;
621};
622
623static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
624 struct tcf_result *res)
625{
626 struct tcf_ife_info *ife = a->priv;
627 int action = ife->tcf_action;
628 struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
629 u16 ifehdrln = ifehdr->metalen;
630 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
631
632 spin_lock(&ife->tcf_lock);
633 bstats_update(&ife->tcf_bstats, skb);
9c4a4e48 634 tcf_lastuse_update(&ife->tcf_tm);
ef6980b6
JHS		 635 spin_unlock(&ife->tcf_lock);
636
637 ifehdrln = ntohs(ifehdrln);
638 if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
639 spin_lock(&ife->tcf_lock);
640 ife->tcf_qstats.drops++;
641 spin_unlock(&ife->tcf_lock);
642 return TC_ACT_SHOT;
643 }
644
645 skb_set_mac_header(skb, ifehdrln);
646 __skb_pull(skb, ifehdrln);
647 skb->protocol = eth_type_trans(skb, skb->dev);
648 ifehdrln -= IFE_METAHDRLEN;
649
650 while (ifehdrln > 0) {
651 u8 *tlvdata = (u8 *)tlv;
652 u16 mtype = tlv->type;
653 u16 mlen = tlv->len;
654
655 mtype = ntohs(mtype);
656 mlen = ntohs(mlen);
657
658 if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
659 (void *)(tlvdata + 4))) {
660 /* abuse overlimits to count when we receive metadata
661 * but dont have an ops for it
662 */
663 pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
664 mtype, mlen);
665 ife->tcf_qstats.overlimits++;
666 }
667
668 tlvdata += mlen;
669 ifehdrln -= mlen;
670 tlv = (struct meta_tlvhdr *)tlvdata;
671 }
672
673 skb_reset_network_header(skb);
674 return action;
675}
676
677/*XXX: check if we can do this at install time instead of current
678 * send data path
679**/
680static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
681{
682 struct tcf_meta_info *e, *n;
683 int tot_run_sz = 0, run_sz = 0;
684
685 list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
686 if (e->ops->check_presence) {
687 run_sz = e->ops->check_presence(skb, e);
688 tot_run_sz += run_sz;
689 }
690 }
691
692 return tot_run_sz;
693}
694
695static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
696 struct tcf_result *res)
697{
698 struct tcf_ife_info *ife = a->priv;
699 int action = ife->tcf_action;
700 struct ethhdr *oethh; /* outer ether header */
701 struct ethhdr *iethh; /* inner eth header */
702 struct tcf_meta_info *e;
703 /*
704 OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
705 where ORIGDATA = original ethernet header ...
706 */
707 u16 metalen = ife_get_sz(skb, ife);
708 int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
709 unsigned int skboff = skb->dev->hard_header_len;
710 u32 at = G_TC_AT(skb->tc_verd);
711 int new_len = skb->len + hdrm;
712 bool exceed_mtu = false;
713 int err;
714
715 if (at & AT_EGRESS) {
716 if (new_len > skb->dev->mtu)
717 exceed_mtu = true;
718 }
719
720 spin_lock(&ife->tcf_lock);
721 bstats_update(&ife->tcf_bstats, skb);
9c4a4e48 722 tcf_lastuse_update(&ife->tcf_tm);
ef6980b6
JHS		 723
724 if (!metalen) { /* no metadata to send */
725 /* abuse overlimits to count when we allow packet
726 * with no metadata
727 */
728 ife->tcf_qstats.overlimits++;
729 spin_unlock(&ife->tcf_lock);
730 return action;
731 }
732 /* could be stupid policy setup or mtu config
733 * so lets be conservative.. */
734 if ((action == TC_ACT_SHOT) || exceed_mtu) {
735 ife->tcf_qstats.drops++;
736 spin_unlock(&ife->tcf_lock);
737 return TC_ACT_SHOT;
738 }
739
740 iethh = eth_hdr(skb);
741
742 err = skb_cow_head(skb, hdrm);
743 if (unlikely(err)) {
744 ife->tcf_qstats.drops++;
745 spin_unlock(&ife->tcf_lock);
746 return TC_ACT_SHOT;
747 }
748
749 if (!(at & AT_EGRESS))
750 skb_push(skb, skb->dev->hard_header_len);
751
752 __skb_push(skb, hdrm);
753 memcpy(skb->data, iethh, skb->mac_len);
754 skb_reset_mac_header(skb);
755 oethh = eth_hdr(skb);
756
757 /*total metadata length */
758 metalen += IFE_METAHDRLEN;
759 metalen = htons(metalen);
760 memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
761 skboff += IFE_METAHDRLEN;
762
763 /* XXX: we dont have a clever way of telling encode to
764 * not repeat some of the computations that are done by
765 * ops->presence_check...
766 */
767 list_for_each_entry(e, &ife->metalist, metalist) {
768 if (e->ops->encode) {
769 err = e->ops->encode(skb, (void *)(skb->data + skboff),
770 e);
771 }
772 if (err < 0) {
773 /* too corrupt to keep around if overwritten */
774 ife->tcf_qstats.drops++;
775 spin_unlock(&ife->tcf_lock);
776 return TC_ACT_SHOT;
777 }
778 skboff += err;
779 }
780
781 if (!is_zero_ether_addr(ife->eth_src))
782 ether_addr_copy(oethh->h_source, ife->eth_src);
783 else
784 ether_addr_copy(oethh->h_source, iethh->h_source);
785 if (!is_zero_ether_addr(ife->eth_dst))
786 ether_addr_copy(oethh->h_dest, ife->eth_dst);
787 else
788 ether_addr_copy(oethh->h_dest, iethh->h_dest);
789 oethh->h_proto = htons(ife->eth_type);
790
791 if (!(at & AT_EGRESS))
792 skb_pull(skb, skb->dev->hard_header_len);
793
794 spin_unlock(&ife->tcf_lock);
795
796 return action;
797}
798
799static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
800 struct tcf_result *res)
801{
802 struct tcf_ife_info *ife = a->priv;
803
804 if (ife->flags & IFE_ENCODE)
805 return tcf_ife_encode(skb, a, res);
806
807 if (!(ife->flags & IFE_ENCODE))
808 return tcf_ife_decode(skb, a, res);
809
810 pr_info_ratelimited("unknown failure(policy neither de/encode\n");
811 spin_lock(&ife->tcf_lock);
812 bstats_update(&ife->tcf_bstats, skb);
9c4a4e48 813 tcf_lastuse_update(&ife->tcf_tm);
ef6980b6
JHS		 814 ife->tcf_qstats.drops++;
815 spin_unlock(&ife->tcf_lock);
816
817 return TC_ACT_SHOT;
818}
819
820static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
821 struct netlink_callback *cb, int type,
822 struct tc_action *a)
823{
824 struct tc_action_net *tn = net_generic(net, ife_net_id);
825
826 return tcf_generic_walker(tn, skb, cb, type, a);
827}
828
829static int tcf_ife_search(struct net *net, struct tc_action *a, u32 index)
830{
831 struct tc_action_net *tn = net_generic(net, ife_net_id);
832
833 return tcf_hash_search(tn, a, index);
834}
835
836static struct tc_action_ops act_ife_ops = {
837 .kind = "ife",
838 .type = TCA_ACT_IFE,
839 .owner = THIS_MODULE,
840 .act = tcf_ife_act,
841 .dump = tcf_ife_dump,
842 .cleanup = tcf_ife_cleanup,
843 .init = tcf_ife_init,
844 .walk = tcf_ife_walker,
845 .lookup = tcf_ife_search,
846};
847
848static __net_init int ife_init_net(struct net *net)
849{
850 struct tc_action_net *tn = net_generic(net, ife_net_id);
851
852 return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
853}
854
855static void __net_exit ife_exit_net(struct net *net)
856{
857 struct tc_action_net *tn = net_generic(net, ife_net_id);
858
859 tc_action_net_exit(tn);
860}
861
862static struct pernet_operations ife_net_ops = {
863 .init = ife_init_net,
864 .exit = ife_exit_net,
865 .id = &ife_net_id,
866 .size = sizeof(struct tc_action_net),
867};
868
869static int __init ife_init_module(void)
870{
871 return tcf_register_action(&act_ife_ops, &ife_net_ops);
872}
873
874static void __exit ife_cleanup_module(void)
875{
876 tcf_unregister_action(&act_ife_ops, &ife_net_ops);
877}
878
879module_init(ife_init_module);
880module_exit(ife_cleanup_module);
881
882MODULE_AUTHOR("Jamal Hadi Salim(2015)");
883MODULE_DESCRIPTION("Inter-FE LFB action");
884MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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