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Linux/net/sched/act_ife.c

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  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(skb, TCA_IFE_TM, sizeof(t), &t))
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");
877 

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