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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 static struct tc_action_ops act_ife_ops;
 41 
 42 static const struct nla_policy ife_policy[TCA_IFE_MAX + 1] = {
 43         [TCA_IFE_PARMS] = { .len = sizeof(struct tc_ife)},
 44         [TCA_IFE_DMAC] = { .len = ETH_ALEN},
 45         [TCA_IFE_SMAC] = { .len = ETH_ALEN},
 46         [TCA_IFE_TYPE] = { .type = NLA_U16},
 47 };
 48 
 49 /* Caller takes care of presenting data in network order
 50 */
 51 int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
 52 {
 53         u32 *tlv = (u32 *)(skbdata);
 54         u16 totlen = nla_total_size(dlen);      /*alignment + hdr */
 55         char *dptr = (char *)tlv + NLA_HDRLEN;
 56         u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
 57 
 58         *tlv = htonl(htlv);
 59         memset(dptr, 0, totlen - NLA_HDRLEN);
 60         memcpy(dptr, dval, dlen);
 61 
 62         return totlen;
 63 }
 64 EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
 65 
 66 int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi)
 67 {
 68         if (mi->metaval)
 69                 return nla_put_u32(skb, mi->metaid, *(u32 *)mi->metaval);
 70         else
 71                 return nla_put(skb, mi->metaid, 0, NULL);
 72 }
 73 EXPORT_SYMBOL_GPL(ife_get_meta_u32);
 74 
 75 int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi)
 76 {
 77         if (metaval || mi->metaval)
 78                 return 8; /* T+L+V == 2+2+4 */
 79 
 80         return 0;
 81 }
 82 EXPORT_SYMBOL_GPL(ife_check_meta_u32);
 83 
 84 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
 85 {
 86         u32 edata = metaval;
 87 
 88         if (mi->metaval)
 89                 edata = *(u32 *)mi->metaval;
 90         else if (metaval)
 91                 edata = metaval;
 92 
 93         if (!edata) /* will not encode */
 94                 return 0;
 95 
 96         edata = htonl(edata);
 97         return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
 98 }
 99 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
100 
101 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
102 {
103         if (mi->metaval)
104                 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
105         else
106                 return nla_put(skb, mi->metaid, 0, NULL);
107 }
108 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
109 
110 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
111 {
112         mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
113         if (!mi->metaval)
114                 return -ENOMEM;
115 
116         return 0;
117 }
118 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
119 
120 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
121 {
122         mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
123         if (!mi->metaval)
124                 return -ENOMEM;
125 
126         return 0;
127 }
128 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
129 
130 void ife_release_meta_gen(struct tcf_meta_info *mi)
131 {
132         kfree(mi->metaval);
133 }
134 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
135 
136 int ife_validate_meta_u32(void *val, int len)
137 {
138         if (len == sizeof(u32))
139                 return 0;
140 
141         return -EINVAL;
142 }
143 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
144 
145 int ife_validate_meta_u16(void *val, int len)
146 {
147         /* length will not include padding */
148         if (len == sizeof(u16))
149                 return 0;
150 
151         return -EINVAL;
152 }
153 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
154 
155 static LIST_HEAD(ifeoplist);
156 static DEFINE_RWLOCK(ife_mod_lock);
157 
158 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
159 {
160         struct tcf_meta_ops *o;
161 
162         read_lock(&ife_mod_lock);
163         list_for_each_entry(o, &ifeoplist, list) {
164                 if (o->metaid == metaid) {
165                         if (!try_module_get(o->owner))
166                                 o = NULL;
167                         read_unlock(&ife_mod_lock);
168                         return o;
169                 }
170         }
171         read_unlock(&ife_mod_lock);
172 
173         return NULL;
174 }
175 
176 int register_ife_op(struct tcf_meta_ops *mops)
177 {
178         struct tcf_meta_ops *m;
179 
180         if (!mops->metaid || !mops->metatype || !mops->name ||
181             !mops->check_presence || !mops->encode || !mops->decode ||
182             !mops->get || !mops->alloc)
183                 return -EINVAL;
184 
185         write_lock(&ife_mod_lock);
186 
187         list_for_each_entry(m, &ifeoplist, list) {
188                 if (m->metaid == mops->metaid ||
189                     (strcmp(mops->name, m->name) == 0)) {
190                         write_unlock(&ife_mod_lock);
191                         return -EEXIST;
192                 }
193         }
194 
195         if (!mops->release)
196                 mops->release = ife_release_meta_gen;
197 
198         list_add_tail(&mops->list, &ifeoplist);
199         write_unlock(&ife_mod_lock);
200         return 0;
201 }
202 EXPORT_SYMBOL_GPL(unregister_ife_op);
203 
204 int unregister_ife_op(struct tcf_meta_ops *mops)
205 {
206         struct tcf_meta_ops *m;
207         int err = -ENOENT;
208 
209         write_lock(&ife_mod_lock);
210         list_for_each_entry(m, &ifeoplist, list) {
211                 if (m->metaid == mops->metaid) {
212                         list_del(&mops->list);
213                         err = 0;
214                         break;
215                 }
216         }
217         write_unlock(&ife_mod_lock);
218 
219         return err;
220 }
221 EXPORT_SYMBOL_GPL(register_ife_op);
222 
223 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
224 {
225         int ret = 0;
226         /* XXX: unfortunately cant use nla_policy at this point
227         * because a length of 0 is valid in the case of
228         * "allow". "use" semantics do enforce for proper
229         * length and i couldve use nla_policy but it makes it hard
230         * to use it just for that..
231         */
232         if (ops->validate)
233                 return ops->validate(val, len);
234 
235         if (ops->metatype == NLA_U32)
236                 ret = ife_validate_meta_u32(val, len);
237         else if (ops->metatype == NLA_U16)
238                 ret = ife_validate_meta_u16(val, len);
239 
240         return ret;
241 }
242 
243 /* called when adding new meta information
244  * under ife->tcf_lock for existing action
245 */
246 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
247                                 void *val, int len, bool exists)
248 {
249         struct tcf_meta_ops *ops = find_ife_oplist(metaid);
250         int ret = 0;
251 
252         if (!ops) {
253                 ret = -ENOENT;
254 #ifdef CONFIG_MODULES
255                 if (exists)
256                         spin_unlock_bh(&ife->tcf_lock);
257                 rtnl_unlock();
258                 request_module("ifemeta%u", metaid);
259                 rtnl_lock();
260                 if (exists)
261                         spin_lock_bh(&ife->tcf_lock);
262                 ops = find_ife_oplist(metaid);
263 #endif
264         }
265 
266         if (ops) {
267                 ret = 0;
268                 if (len)
269                         ret = ife_validate_metatype(ops, val, len);
270 
271                 module_put(ops->owner);
272         }
273 
274         return ret;
275 }
276 
277 /* called when adding new meta information
278  * under ife->tcf_lock for existing action
279 */
280 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
281                         int len, bool atomic)
282 {
283         struct tcf_meta_info *mi = NULL;
284         struct tcf_meta_ops *ops = find_ife_oplist(metaid);
285         int ret = 0;
286 
287         if (!ops)
288                 return -ENOENT;
289 
290         mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
291         if (!mi) {
292                 /*put back what find_ife_oplist took */
293                 module_put(ops->owner);
294                 return -ENOMEM;
295         }
296 
297         mi->metaid = metaid;
298         mi->ops = ops;
299         if (len > 0) {
300                 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
301                 if (ret != 0) {
302                         kfree(mi);
303                         module_put(ops->owner);
304                         return ret;
305                 }
306         }
307 
308         list_add_tail(&mi->metalist, &ife->metalist);
309 
310         return ret;
311 }
312 
313 static int use_all_metadata(struct tcf_ife_info *ife)
314 {
315         struct tcf_meta_ops *o;
316         int rc = 0;
317         int installed = 0;
318 
319         read_lock(&ife_mod_lock);
320         list_for_each_entry(o, &ifeoplist, list) {
321                 rc = add_metainfo(ife, o->metaid, NULL, 0, true);
322                 if (rc == 0)
323                         installed += 1;
324         }
325         read_unlock(&ife_mod_lock);
326 
327         if (installed)
328                 return 0;
329         else
330                 return -EINVAL;
331 }
332 
333 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
334 {
335         struct tcf_meta_info *e;
336         struct nlattr *nest;
337         unsigned char *b = skb_tail_pointer(skb);
338         int total_encoded = 0;
339 
340         /*can only happen on decode */
341         if (list_empty(&ife->metalist))
342                 return 0;
343 
344         nest = nla_nest_start(skb, TCA_IFE_METALST);
345         if (!nest)
346                 goto out_nlmsg_trim;
347 
348         list_for_each_entry(e, &ife->metalist, metalist) {
349                 if (!e->ops->get(skb, e))
350                         total_encoded += 1;
351         }
352 
353         if (!total_encoded)
354                 goto out_nlmsg_trim;
355 
356         nla_nest_end(skb, nest);
357 
358         return 0;
359 
360 out_nlmsg_trim:
361         nlmsg_trim(skb, b);
362         return -1;
363 }
364 
365 /* under ife->tcf_lock */
366 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
367 {
368         struct tcf_ife_info *ife = to_ife(a);
369         struct tcf_meta_info *e, *n;
370 
371         list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
372                 module_put(e->ops->owner);
373                 list_del(&e->metalist);
374                 if (e->metaval) {
375                         if (e->ops->release)
376                                 e->ops->release(e);
377                         else
378                                 kfree(e->metaval);
379                 }
380                 kfree(e);
381         }
382 }
383 
384 static void tcf_ife_cleanup(struct tc_action *a, int bind)
385 {
386         struct tcf_ife_info *ife = to_ife(a);
387 
388         spin_lock_bh(&ife->tcf_lock);
389         _tcf_ife_cleanup(a, bind);
390         spin_unlock_bh(&ife->tcf_lock);
391 }
392 
393 /* under ife->tcf_lock for existing action */
394 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
395                              bool exists)
396 {
397         int len = 0;
398         int rc = 0;
399         int i = 0;
400         void *val;
401 
402         for (i = 1; i < max_metacnt; i++) {
403                 if (tb[i]) {
404                         val = nla_data(tb[i]);
405                         len = nla_len(tb[i]);
406 
407                         rc = load_metaops_and_vet(ife, i, val, len, exists);
408                         if (rc != 0)
409                                 return rc;
410 
411                         rc = add_metainfo(ife, i, val, len, exists);
412                         if (rc)
413                                 return rc;
414                 }
415         }
416 
417         return rc;
418 }
419 
420 static int tcf_ife_init(struct net *net, struct nlattr *nla,
421                         struct nlattr *est, struct tc_action **a,
422                         int ovr, int bind)
423 {
424         struct tc_action_net *tn = net_generic(net, ife_net_id);
425         struct nlattr *tb[TCA_IFE_MAX + 1];
426         struct nlattr *tb2[IFE_META_MAX + 1];
427         struct tcf_ife_info *ife;
428         struct tc_ife *parm;
429         u16 ife_type = 0;
430         u8 *daddr = NULL;
431         u8 *saddr = NULL;
432         bool exists = false;
433         int ret = 0;
434         int err;
435 
436         err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy);
437         if (err < 0)
438                 return err;
439 
440         if (!tb[TCA_IFE_PARMS])
441                 return -EINVAL;
442 
443         parm = nla_data(tb[TCA_IFE_PARMS]);
444 
445         exists = tcf_hash_check(tn, parm->index, a, bind);
446         if (exists && bind)
447                 return 0;
448 
449         if (parm->flags & IFE_ENCODE) {
450                 /* Until we get issued the ethertype, we cant have
451                  * a default..
452                 **/
453                 if (!tb[TCA_IFE_TYPE]) {
454                         if (exists)
455                                 tcf_hash_release(*a, bind);
456                         pr_info("You MUST pass etherype for encoding\n");
457                         return -EINVAL;
458                 }
459         }
460 
461         if (!exists) {
462                 ret = tcf_hash_create(tn, parm->index, est, a, &act_ife_ops,
463                                       bind, false);
464                 if (ret)
465                         return ret;
466                 ret = ACT_P_CREATED;
467         } else {
468                 tcf_hash_release(*a, bind);
469                 if (!ovr)
470                         return -EEXIST;
471         }
472 
473         ife = to_ife(*a);
474         ife->flags = parm->flags;
475 
476         if (parm->flags & IFE_ENCODE) {
477                 ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
478                 if (tb[TCA_IFE_DMAC])
479                         daddr = nla_data(tb[TCA_IFE_DMAC]);
480                 if (tb[TCA_IFE_SMAC])
481                         saddr = nla_data(tb[TCA_IFE_SMAC]);
482         }
483 
484         if (exists)
485                 spin_lock_bh(&ife->tcf_lock);
486         ife->tcf_action = parm->action;
487 
488         if (parm->flags & IFE_ENCODE) {
489                 if (daddr)
490                         ether_addr_copy(ife->eth_dst, daddr);
491                 else
492                         eth_zero_addr(ife->eth_dst);
493 
494                 if (saddr)
495                         ether_addr_copy(ife->eth_src, saddr);
496                 else
497                         eth_zero_addr(ife->eth_src);
498 
499                 ife->eth_type = ife_type;
500         }
501 
502         if (ret == ACT_P_CREATED)
503                 INIT_LIST_HEAD(&ife->metalist);
504 
505         if (tb[TCA_IFE_METALST]) {
506                 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
507                                        NULL);
508                 if (err) {
509 metadata_parse_err:
510                         if (exists)
511                                 tcf_hash_release(*a, bind);
512                         if (ret == ACT_P_CREATED)
513                                 _tcf_ife_cleanup(*a, bind);
514 
515                         if (exists)
516                                 spin_unlock_bh(&ife->tcf_lock);
517                         return err;
518                 }
519 
520                 err = populate_metalist(ife, tb2, exists);
521                 if (err)
522                         goto metadata_parse_err;
523 
524         } else {
525                 /* if no passed metadata allow list or passed allow-all
526                  * then here we process by adding as many supported metadatum
527                  * as we can. You better have at least one else we are
528                  * going to bail out
529                  */
530                 err = use_all_metadata(ife);
531                 if (err) {
532                         if (ret == ACT_P_CREATED)
533                                 _tcf_ife_cleanup(*a, bind);
534 
535                         if (exists)
536                                 spin_unlock_bh(&ife->tcf_lock);
537                         return err;
538                 }
539         }
540 
541         if (exists)
542                 spin_unlock_bh(&ife->tcf_lock);
543 
544         if (ret == ACT_P_CREATED)
545                 tcf_hash_insert(tn, *a);
546 
547         return ret;
548 }
549 
550 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
551                         int ref)
552 {
553         unsigned char *b = skb_tail_pointer(skb);
554         struct tcf_ife_info *ife = to_ife(a);
555         struct tc_ife opt = {
556                 .index = ife->tcf_index,
557                 .refcnt = ife->tcf_refcnt - ref,
558                 .bindcnt = ife->tcf_bindcnt - bind,
559                 .action = ife->tcf_action,
560                 .flags = ife->flags,
561         };
562         struct tcf_t t;
563 
564         if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
565                 goto nla_put_failure;
566 
567         tcf_tm_dump(&t, &ife->tcf_tm);
568         if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
569                 goto nla_put_failure;
570 
571         if (!is_zero_ether_addr(ife->eth_dst)) {
572                 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, ife->eth_dst))
573                         goto nla_put_failure;
574         }
575 
576         if (!is_zero_ether_addr(ife->eth_src)) {
577                 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, ife->eth_src))
578                         goto nla_put_failure;
579         }
580 
581         if (nla_put(skb, TCA_IFE_TYPE, 2, &ife->eth_type))
582                 goto nla_put_failure;
583 
584         if (dump_metalist(skb, ife)) {
585                 /*ignore failure to dump metalist */
586                 pr_info("Failed to dump metalist\n");
587         }
588 
589         return skb->len;
590 
591 nla_put_failure:
592         nlmsg_trim(skb, b);
593         return -1;
594 }
595 
596 int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
597                        u16 metaid, u16 mlen, void *mdata)
598 {
599         struct tcf_meta_info *e;
600 
601         /* XXX: use hash to speed up */
602         list_for_each_entry(e, &ife->metalist, metalist) {
603                 if (metaid == e->metaid) {
604                         if (e->ops) {
605                                 /* We check for decode presence already */
606                                 return e->ops->decode(skb, mdata, mlen);
607                         }
608                 }
609         }
610 
611         return 0;
612 }
613 
614 struct ifeheadr {
615         __be16 metalen;
616         u8 tlv_data[];
617 };
618 
619 struct meta_tlvhdr {
620         __be16 type;
621         __be16 len;
622 };
623 
624 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
625                           struct tcf_result *res)
626 {
627         struct tcf_ife_info *ife = to_ife(a);
628         int action = ife->tcf_action;
629         struct ifeheadr *ifehdr = (struct ifeheadr *)skb->data;
630         int ifehdrln = (int)ifehdr->metalen;
631         struct meta_tlvhdr *tlv = (struct meta_tlvhdr *)(ifehdr->tlv_data);
632 
633         spin_lock(&ife->tcf_lock);
634         bstats_update(&ife->tcf_bstats, skb);
635         tcf_lastuse_update(&ife->tcf_tm);
636         spin_unlock(&ife->tcf_lock);
637 
638         ifehdrln = ntohs(ifehdrln);
639         if (unlikely(!pskb_may_pull(skb, ifehdrln))) {
640                 spin_lock(&ife->tcf_lock);
641                 ife->tcf_qstats.drops++;
642                 spin_unlock(&ife->tcf_lock);
643                 return TC_ACT_SHOT;
644         }
645 
646         skb_set_mac_header(skb, ifehdrln);
647         __skb_pull(skb, ifehdrln);
648         skb->protocol = eth_type_trans(skb, skb->dev);
649         ifehdrln -= IFE_METAHDRLEN;
650 
651         while (ifehdrln > 0) {
652                 u8 *tlvdata = (u8 *)tlv;
653                 u16 mtype = tlv->type;
654                 u16 mlen = tlv->len;
655                 u16 alen;
656 
657                 mtype = ntohs(mtype);
658                 mlen = ntohs(mlen);
659                 alen = NLA_ALIGN(mlen);
660 
661                 if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN),
662                                        (void *)(tlvdata + NLA_HDRLEN))) {
663                         /* abuse overlimits to count when we receive metadata
664                          * but dont have an ops for it
665                          */
666                         pr_info_ratelimited("Unknown metaid %d alnlen %d\n",
667                                             mtype, mlen);
668                         ife->tcf_qstats.overlimits++;
669                 }
670 
671                 tlvdata += alen;
672                 ifehdrln -= alen;
673                 tlv = (struct meta_tlvhdr *)tlvdata;
674         }
675 
676         skb_reset_network_header(skb);
677         return action;
678 }
679 
680 /*XXX: check if we can do this at install time instead of current
681  * send data path
682 **/
683 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
684 {
685         struct tcf_meta_info *e, *n;
686         int tot_run_sz = 0, run_sz = 0;
687 
688         list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
689                 if (e->ops->check_presence) {
690                         run_sz = e->ops->check_presence(skb, e);
691                         tot_run_sz += run_sz;
692                 }
693         }
694 
695         return tot_run_sz;
696 }
697 
698 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
699                           struct tcf_result *res)
700 {
701         struct tcf_ife_info *ife = to_ife(a);
702         int action = ife->tcf_action;
703         struct ethhdr *oethh;   /* outer ether header */
704         struct ethhdr *iethh;   /* inner eth header */
705         struct tcf_meta_info *e;
706         /*
707            OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
708            where ORIGDATA = original ethernet header ...
709          */
710         u16 metalen = ife_get_sz(skb, ife);
711         int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
712         unsigned int skboff = skb->dev->hard_header_len;
713         u32 at = G_TC_AT(skb->tc_verd);
714         int new_len = skb->len + hdrm;
715         bool exceed_mtu = false;
716         int err;
717 
718         if (at & AT_EGRESS) {
719                 if (new_len > skb->dev->mtu)
720                         exceed_mtu = true;
721         }
722 
723         spin_lock(&ife->tcf_lock);
724         bstats_update(&ife->tcf_bstats, skb);
725         tcf_lastuse_update(&ife->tcf_tm);
726 
727         if (!metalen) {         /* no metadata to send */
728                 /* abuse overlimits to count when we allow packet
729                  * with no metadata
730                  */
731                 ife->tcf_qstats.overlimits++;
732                 spin_unlock(&ife->tcf_lock);
733                 return action;
734         }
735         /* could be stupid policy setup or mtu config
736          * so lets be conservative.. */
737         if ((action == TC_ACT_SHOT) || exceed_mtu) {
738                 ife->tcf_qstats.drops++;
739                 spin_unlock(&ife->tcf_lock);
740                 return TC_ACT_SHOT;
741         }
742 
743         err = skb_cow_head(skb, hdrm);
744         if (unlikely(err)) {
745                 ife->tcf_qstats.drops++;
746                 spin_unlock(&ife->tcf_lock);
747                 return TC_ACT_SHOT;
748         }
749 
750         if (!(at & AT_EGRESS))
751                 skb_push(skb, skb->dev->hard_header_len);
752 
753         iethh = (struct ethhdr *)skb->data;
754         __skb_push(skb, hdrm);
755         memcpy(skb->data, iethh, skb->mac_len);
756         skb_reset_mac_header(skb);
757         oethh = eth_hdr(skb);
758 
759         /*total metadata length */
760         metalen += IFE_METAHDRLEN;
761         metalen = htons(metalen);
762         memcpy((skb->data + skboff), &metalen, IFE_METAHDRLEN);
763         skboff += IFE_METAHDRLEN;
764 
765         /* XXX: we dont have a clever way of telling encode to
766          * not repeat some of the computations that are done by
767          * ops->presence_check...
768          */
769         list_for_each_entry(e, &ife->metalist, metalist) {
770                 if (e->ops->encode) {
771                         err = e->ops->encode(skb, (void *)(skb->data + skboff),
772                                              e);
773                 }
774                 if (err < 0) {
775                         /* too corrupt to keep around if overwritten */
776                         ife->tcf_qstats.drops++;
777                         spin_unlock(&ife->tcf_lock);
778                         return TC_ACT_SHOT;
779                 }
780                 skboff += err;
781         }
782 
783         if (!is_zero_ether_addr(ife->eth_src))
784                 ether_addr_copy(oethh->h_source, ife->eth_src);
785         else
786                 ether_addr_copy(oethh->h_source, iethh->h_source);
787         if (!is_zero_ether_addr(ife->eth_dst))
788                 ether_addr_copy(oethh->h_dest, ife->eth_dst);
789         else
790                 ether_addr_copy(oethh->h_dest, iethh->h_dest);
791         oethh->h_proto = htons(ife->eth_type);
792 
793         if (!(at & AT_EGRESS))
794                 skb_pull(skb, skb->dev->hard_header_len);
795 
796         spin_unlock(&ife->tcf_lock);
797 
798         return action;
799 }
800 
801 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
802                        struct tcf_result *res)
803 {
804         struct tcf_ife_info *ife = to_ife(a);
805 
806         if (ife->flags & IFE_ENCODE)
807                 return tcf_ife_encode(skb, a, res);
808 
809         if (!(ife->flags & IFE_ENCODE))
810                 return tcf_ife_decode(skb, a, res);
811 
812         pr_info_ratelimited("unknown failure(policy neither de/encode\n");
813         spin_lock(&ife->tcf_lock);
814         bstats_update(&ife->tcf_bstats, skb);
815         tcf_lastuse_update(&ife->tcf_tm);
816         ife->tcf_qstats.drops++;
817         spin_unlock(&ife->tcf_lock);
818 
819         return TC_ACT_SHOT;
820 }
821 
822 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
823                           struct netlink_callback *cb, int type,
824                           const struct tc_action_ops *ops)
825 {
826         struct tc_action_net *tn = net_generic(net, ife_net_id);
827 
828         return tcf_generic_walker(tn, skb, cb, type, ops);
829 }
830 
831 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
832 {
833         struct tc_action_net *tn = net_generic(net, ife_net_id);
834 
835         return tcf_hash_search(tn, a, index);
836 }
837 
838 static struct tc_action_ops act_ife_ops = {
839         .kind = "ife",
840         .type = TCA_ACT_IFE,
841         .owner = THIS_MODULE,
842         .act = tcf_ife_act,
843         .dump = tcf_ife_dump,
844         .cleanup = tcf_ife_cleanup,
845         .init = tcf_ife_init,
846         .walk = tcf_ife_walker,
847         .lookup = tcf_ife_search,
848         .size = sizeof(struct tcf_ife_info),
849 };
850 
851 static __net_init int ife_init_net(struct net *net)
852 {
853         struct tc_action_net *tn = net_generic(net, ife_net_id);
854 
855         return tc_action_net_init(tn, &act_ife_ops, IFE_TAB_MASK);
856 }
857 
858 static void __net_exit ife_exit_net(struct net *net)
859 {
860         struct tc_action_net *tn = net_generic(net, ife_net_id);
861 
862         tc_action_net_exit(tn);
863 }
864 
865 static struct pernet_operations ife_net_ops = {
866         .init = ife_init_net,
867         .exit = ife_exit_net,
868         .id   = &ife_net_id,
869         .size = sizeof(struct tc_action_net),
870 };
871 
872 static int __init ife_init_module(void)
873 {
874         return tcf_register_action(&act_ife_ops, &ife_net_ops);
875 }
876 
877 static void __exit ife_cleanup_module(void)
878 {
879         tcf_unregister_action(&act_ife_ops, &ife_net_ops);
880 }
881 
882 module_init(ife_init_module);
883 module_exit(ife_cleanup_module);
884 
885 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
886 MODULE_DESCRIPTION("Inter-FE LFB action");
887 MODULE_LICENSE("GPL");
888 

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