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Linux/net/sched/act_ife.c

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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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 #include <net/ife.h>
 36 
 37 static unsigned int ife_net_id;
 38 static int max_metacnt = IFE_META_MAX + 1;
 39 static struct tc_action_ops act_ife_ops;
 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 int ife_encode_meta_u16(u16 metaval, void *skbdata, struct tcf_meta_info *mi)
 49 {
 50         u16 edata = 0;
 51 
 52         if (mi->metaval)
 53                 edata = *(u16 *)mi->metaval;
 54         else if (metaval)
 55                 edata = metaval;
 56 
 57         if (!edata) /* will not encode */
 58                 return 0;
 59 
 60         edata = htons(edata);
 61         return ife_tlv_meta_encode(skbdata, mi->metaid, 2, &edata);
 62 }
 63 EXPORT_SYMBOL_GPL(ife_encode_meta_u16);
 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_check_meta_u16(u16 metaval, struct tcf_meta_info *mi)
 84 {
 85         if (metaval || mi->metaval)
 86                 return 8; /* T+L+(V) == 2+2+(2+2bytepad) */
 87 
 88         return 0;
 89 }
 90 EXPORT_SYMBOL_GPL(ife_check_meta_u16);
 91 
 92 int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi)
 93 {
 94         u32 edata = metaval;
 95 
 96         if (mi->metaval)
 97                 edata = *(u32 *)mi->metaval;
 98         else if (metaval)
 99                 edata = metaval;
100 
101         if (!edata) /* will not encode */
102                 return 0;
103 
104         edata = htonl(edata);
105         return ife_tlv_meta_encode(skbdata, mi->metaid, 4, &edata);
106 }
107 EXPORT_SYMBOL_GPL(ife_encode_meta_u32);
108 
109 int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi)
110 {
111         if (mi->metaval)
112                 return nla_put_u16(skb, mi->metaid, *(u16 *)mi->metaval);
113         else
114                 return nla_put(skb, mi->metaid, 0, NULL);
115 }
116 EXPORT_SYMBOL_GPL(ife_get_meta_u16);
117 
118 int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
119 {
120         mi->metaval = kmemdup(metaval, sizeof(u32), gfp);
121         if (!mi->metaval)
122                 return -ENOMEM;
123 
124         return 0;
125 }
126 EXPORT_SYMBOL_GPL(ife_alloc_meta_u32);
127 
128 int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp)
129 {
130         mi->metaval = kmemdup(metaval, sizeof(u16), gfp);
131         if (!mi->metaval)
132                 return -ENOMEM;
133 
134         return 0;
135 }
136 EXPORT_SYMBOL_GPL(ife_alloc_meta_u16);
137 
138 void ife_release_meta_gen(struct tcf_meta_info *mi)
139 {
140         kfree(mi->metaval);
141 }
142 EXPORT_SYMBOL_GPL(ife_release_meta_gen);
143 
144 int ife_validate_meta_u32(void *val, int len)
145 {
146         if (len == sizeof(u32))
147                 return 0;
148 
149         return -EINVAL;
150 }
151 EXPORT_SYMBOL_GPL(ife_validate_meta_u32);
152 
153 int ife_validate_meta_u16(void *val, int len)
154 {
155         /* length will not include padding */
156         if (len == sizeof(u16))
157                 return 0;
158 
159         return -EINVAL;
160 }
161 EXPORT_SYMBOL_GPL(ife_validate_meta_u16);
162 
163 static LIST_HEAD(ifeoplist);
164 static DEFINE_RWLOCK(ife_mod_lock);
165 
166 static struct tcf_meta_ops *find_ife_oplist(u16 metaid)
167 {
168         struct tcf_meta_ops *o;
169 
170         read_lock(&ife_mod_lock);
171         list_for_each_entry(o, &ifeoplist, list) {
172                 if (o->metaid == metaid) {
173                         if (!try_module_get(o->owner))
174                                 o = NULL;
175                         read_unlock(&ife_mod_lock);
176                         return o;
177                 }
178         }
179         read_unlock(&ife_mod_lock);
180 
181         return NULL;
182 }
183 
184 int register_ife_op(struct tcf_meta_ops *mops)
185 {
186         struct tcf_meta_ops *m;
187 
188         if (!mops->metaid || !mops->metatype || !mops->name ||
189             !mops->check_presence || !mops->encode || !mops->decode ||
190             !mops->get || !mops->alloc)
191                 return -EINVAL;
192 
193         write_lock(&ife_mod_lock);
194 
195         list_for_each_entry(m, &ifeoplist, list) {
196                 if (m->metaid == mops->metaid ||
197                     (strcmp(mops->name, m->name) == 0)) {
198                         write_unlock(&ife_mod_lock);
199                         return -EEXIST;
200                 }
201         }
202 
203         if (!mops->release)
204                 mops->release = ife_release_meta_gen;
205 
206         list_add_tail(&mops->list, &ifeoplist);
207         write_unlock(&ife_mod_lock);
208         return 0;
209 }
210 EXPORT_SYMBOL_GPL(unregister_ife_op);
211 
212 int unregister_ife_op(struct tcf_meta_ops *mops)
213 {
214         struct tcf_meta_ops *m;
215         int err = -ENOENT;
216 
217         write_lock(&ife_mod_lock);
218         list_for_each_entry(m, &ifeoplist, list) {
219                 if (m->metaid == mops->metaid) {
220                         list_del(&mops->list);
221                         err = 0;
222                         break;
223                 }
224         }
225         write_unlock(&ife_mod_lock);
226 
227         return err;
228 }
229 EXPORT_SYMBOL_GPL(register_ife_op);
230 
231 static int ife_validate_metatype(struct tcf_meta_ops *ops, void *val, int len)
232 {
233         int ret = 0;
234         /* XXX: unfortunately cant use nla_policy at this point
235         * because a length of 0 is valid in the case of
236         * "allow". "use" semantics do enforce for proper
237         * length and i couldve use nla_policy but it makes it hard
238         * to use it just for that..
239         */
240         if (ops->validate)
241                 return ops->validate(val, len);
242 
243         if (ops->metatype == NLA_U32)
244                 ret = ife_validate_meta_u32(val, len);
245         else if (ops->metatype == NLA_U16)
246                 ret = ife_validate_meta_u16(val, len);
247 
248         return ret;
249 }
250 
251 #ifdef CONFIG_MODULES
252 static const char *ife_meta_id2name(u32 metaid)
253 {
254         switch (metaid) {
255         case IFE_META_SKBMARK:
256                 return "skbmark";
257         case IFE_META_PRIO:
258                 return "skbprio";
259         case IFE_META_TCINDEX:
260                 return "tcindex";
261         default:
262                 return "unknown";
263         }
264 }
265 #endif
266 
267 /* called when adding new meta information
268  * under ife->tcf_lock for existing action
269 */
270 static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
271                                 void *val, int len, bool exists)
272 {
273         struct tcf_meta_ops *ops = find_ife_oplist(metaid);
274         int ret = 0;
275 
276         if (!ops) {
277                 ret = -ENOENT;
278 #ifdef CONFIG_MODULES
279                 if (exists)
280                         spin_unlock_bh(&ife->tcf_lock);
281                 rtnl_unlock();
282                 request_module("ife-meta-%s", ife_meta_id2name(metaid));
283                 rtnl_lock();
284                 if (exists)
285                         spin_lock_bh(&ife->tcf_lock);
286                 ops = find_ife_oplist(metaid);
287 #endif
288         }
289 
290         if (ops) {
291                 ret = 0;
292                 if (len)
293                         ret = ife_validate_metatype(ops, val, len);
294 
295                 module_put(ops->owner);
296         }
297 
298         return ret;
299 }
300 
301 /* called when adding new meta information
302  * under ife->tcf_lock for existing action
303 */
304 static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
305                         int len, bool atomic)
306 {
307         struct tcf_meta_info *mi = NULL;
308         struct tcf_meta_ops *ops = find_ife_oplist(metaid);
309         int ret = 0;
310 
311         if (!ops)
312                 return -ENOENT;
313 
314         mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
315         if (!mi) {
316                 /*put back what find_ife_oplist took */
317                 module_put(ops->owner);
318                 return -ENOMEM;
319         }
320 
321         mi->metaid = metaid;
322         mi->ops = ops;
323         if (len > 0) {
324                 ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
325                 if (ret != 0) {
326                         kfree(mi);
327                         module_put(ops->owner);
328                         return ret;
329                 }
330         }
331 
332         list_add_tail(&mi->metalist, &ife->metalist);
333 
334         return ret;
335 }
336 
337 static int use_all_metadata(struct tcf_ife_info *ife)
338 {
339         struct tcf_meta_ops *o;
340         int rc = 0;
341         int installed = 0;
342 
343         read_lock(&ife_mod_lock);
344         list_for_each_entry(o, &ifeoplist, list) {
345                 rc = add_metainfo(ife, o->metaid, NULL, 0, true);
346                 if (rc == 0)
347                         installed += 1;
348         }
349         read_unlock(&ife_mod_lock);
350 
351         if (installed)
352                 return 0;
353         else
354                 return -EINVAL;
355 }
356 
357 static int dump_metalist(struct sk_buff *skb, struct tcf_ife_info *ife)
358 {
359         struct tcf_meta_info *e;
360         struct nlattr *nest;
361         unsigned char *b = skb_tail_pointer(skb);
362         int total_encoded = 0;
363 
364         /*can only happen on decode */
365         if (list_empty(&ife->metalist))
366                 return 0;
367 
368         nest = nla_nest_start(skb, TCA_IFE_METALST);
369         if (!nest)
370                 goto out_nlmsg_trim;
371 
372         list_for_each_entry(e, &ife->metalist, metalist) {
373                 if (!e->ops->get(skb, e))
374                         total_encoded += 1;
375         }
376 
377         if (!total_encoded)
378                 goto out_nlmsg_trim;
379 
380         nla_nest_end(skb, nest);
381 
382         return 0;
383 
384 out_nlmsg_trim:
385         nlmsg_trim(skb, b);
386         return -1;
387 }
388 
389 /* under ife->tcf_lock */
390 static void _tcf_ife_cleanup(struct tc_action *a, int bind)
391 {
392         struct tcf_ife_info *ife = to_ife(a);
393         struct tcf_meta_info *e, *n;
394 
395         list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
396                 module_put(e->ops->owner);
397                 list_del(&e->metalist);
398                 if (e->metaval) {
399                         if (e->ops->release)
400                                 e->ops->release(e);
401                         else
402                                 kfree(e->metaval);
403                 }
404                 kfree(e);
405         }
406 }
407 
408 static void tcf_ife_cleanup(struct tc_action *a, int bind)
409 {
410         struct tcf_ife_info *ife = to_ife(a);
411         struct tcf_ife_params *p;
412 
413         spin_lock_bh(&ife->tcf_lock);
414         _tcf_ife_cleanup(a, bind);
415         spin_unlock_bh(&ife->tcf_lock);
416 
417         p = rcu_dereference_protected(ife->params, 1);
418         kfree_rcu(p, rcu);
419 }
420 
421 /* under ife->tcf_lock for existing action */
422 static int populate_metalist(struct tcf_ife_info *ife, struct nlattr **tb,
423                              bool exists)
424 {
425         int len = 0;
426         int rc = 0;
427         int i = 0;
428         void *val;
429 
430         for (i = 1; i < max_metacnt; i++) {
431                 if (tb[i]) {
432                         val = nla_data(tb[i]);
433                         len = nla_len(tb[i]);
434 
435                         rc = load_metaops_and_vet(ife, i, val, len, exists);
436                         if (rc != 0)
437                                 return rc;
438 
439                         rc = add_metainfo(ife, i, val, len, exists);
440                         if (rc)
441                                 return rc;
442                 }
443         }
444 
445         return rc;
446 }
447 
448 static int tcf_ife_init(struct net *net, struct nlattr *nla,
449                         struct nlattr *est, struct tc_action **a,
450                         int ovr, int bind)
451 {
452         struct tc_action_net *tn = net_generic(net, ife_net_id);
453         struct nlattr *tb[TCA_IFE_MAX + 1];
454         struct nlattr *tb2[IFE_META_MAX + 1];
455         struct tcf_ife_params *p, *p_old;
456         struct tcf_ife_info *ife;
457         u16 ife_type = ETH_P_IFE;
458         struct tc_ife *parm;
459         u8 *daddr = NULL;
460         u8 *saddr = NULL;
461         bool exists = false;
462         int ret = 0;
463         int err;
464 
465         err = nla_parse_nested(tb, TCA_IFE_MAX, nla, ife_policy, NULL);
466         if (err < 0)
467                 return err;
468 
469         if (!tb[TCA_IFE_PARMS])
470                 return -EINVAL;
471 
472         parm = nla_data(tb[TCA_IFE_PARMS]);
473 
474         /* IFE_DECODE is 0 and indicates the opposite of IFE_ENCODE because
475          * they cannot run as the same time. Check on all other values which
476          * are not supported right now.
477          */
478         if (parm->flags & ~IFE_ENCODE)
479                 return -EINVAL;
480 
481         p = kzalloc(sizeof(*p), GFP_KERNEL);
482         if (!p)
483                 return -ENOMEM;
484 
485         exists = tcf_idr_check(tn, parm->index, a, bind);
486         if (exists && bind) {
487                 kfree(p);
488                 return 0;
489         }
490 
491         if (!exists) {
492                 ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops,
493                                      bind, true);
494                 if (ret) {
495                         kfree(p);
496                         return ret;
497                 }
498                 ret = ACT_P_CREATED;
499         } else {
500                 tcf_idr_release(*a, bind);
501                 if (!ovr) {
502                         kfree(p);
503                         return -EEXIST;
504                 }
505         }
506 
507         ife = to_ife(*a);
508         p->flags = parm->flags;
509 
510         if (parm->flags & IFE_ENCODE) {
511                 if (tb[TCA_IFE_TYPE])
512                         ife_type = nla_get_u16(tb[TCA_IFE_TYPE]);
513                 if (tb[TCA_IFE_DMAC])
514                         daddr = nla_data(tb[TCA_IFE_DMAC]);
515                 if (tb[TCA_IFE_SMAC])
516                         saddr = nla_data(tb[TCA_IFE_SMAC]);
517         }
518 
519         ife->tcf_action = parm->action;
520 
521         if (parm->flags & IFE_ENCODE) {
522                 if (daddr)
523                         ether_addr_copy(p->eth_dst, daddr);
524                 else
525                         eth_zero_addr(p->eth_dst);
526 
527                 if (saddr)
528                         ether_addr_copy(p->eth_src, saddr);
529                 else
530                         eth_zero_addr(p->eth_src);
531 
532                 p->eth_type = ife_type;
533         }
534 
535         if (exists)
536                 spin_lock_bh(&ife->tcf_lock);
537 
538         if (ret == ACT_P_CREATED)
539                 INIT_LIST_HEAD(&ife->metalist);
540 
541         if (tb[TCA_IFE_METALST]) {
542                 err = nla_parse_nested(tb2, IFE_META_MAX, tb[TCA_IFE_METALST],
543                                        NULL, NULL);
544                 if (err) {
545 metadata_parse_err:
546                         if (exists)
547                                 tcf_idr_release(*a, bind);
548                         if (ret == ACT_P_CREATED)
549                                 _tcf_ife_cleanup(*a, bind);
550 
551                         if (exists)
552                                 spin_unlock_bh(&ife->tcf_lock);
553                         kfree(p);
554                         return err;
555                 }
556 
557                 err = populate_metalist(ife, tb2, exists);
558                 if (err)
559                         goto metadata_parse_err;
560 
561         } else {
562                 /* if no passed metadata allow list or passed allow-all
563                  * then here we process by adding as many supported metadatum
564                  * as we can. You better have at least one else we are
565                  * going to bail out
566                  */
567                 err = use_all_metadata(ife);
568                 if (err) {
569                         if (ret == ACT_P_CREATED)
570                                 _tcf_ife_cleanup(*a, bind);
571 
572                         if (exists)
573                                 spin_unlock_bh(&ife->tcf_lock);
574                         kfree(p);
575                         return err;
576                 }
577         }
578 
579         if (exists)
580                 spin_unlock_bh(&ife->tcf_lock);
581 
582         p_old = rtnl_dereference(ife->params);
583         rcu_assign_pointer(ife->params, p);
584         if (p_old)
585                 kfree_rcu(p_old, rcu);
586 
587         if (ret == ACT_P_CREATED)
588                 tcf_idr_insert(tn, *a);
589 
590         return ret;
591 }
592 
593 static int tcf_ife_dump(struct sk_buff *skb, struct tc_action *a, int bind,
594                         int ref)
595 {
596         unsigned char *b = skb_tail_pointer(skb);
597         struct tcf_ife_info *ife = to_ife(a);
598         struct tcf_ife_params *p = rtnl_dereference(ife->params);
599         struct tc_ife opt = {
600                 .index = ife->tcf_index,
601                 .refcnt = ife->tcf_refcnt - ref,
602                 .bindcnt = ife->tcf_bindcnt - bind,
603                 .action = ife->tcf_action,
604                 .flags = p->flags,
605         };
606         struct tcf_t t;
607 
608         if (nla_put(skb, TCA_IFE_PARMS, sizeof(opt), &opt))
609                 goto nla_put_failure;
610 
611         tcf_tm_dump(&t, &ife->tcf_tm);
612         if (nla_put_64bit(skb, TCA_IFE_TM, sizeof(t), &t, TCA_IFE_PAD))
613                 goto nla_put_failure;
614 
615         if (!is_zero_ether_addr(p->eth_dst)) {
616                 if (nla_put(skb, TCA_IFE_DMAC, ETH_ALEN, p->eth_dst))
617                         goto nla_put_failure;
618         }
619 
620         if (!is_zero_ether_addr(p->eth_src)) {
621                 if (nla_put(skb, TCA_IFE_SMAC, ETH_ALEN, p->eth_src))
622                         goto nla_put_failure;
623         }
624 
625         if (nla_put(skb, TCA_IFE_TYPE, 2, &p->eth_type))
626                 goto nla_put_failure;
627 
628         if (dump_metalist(skb, ife)) {
629                 /*ignore failure to dump metalist */
630                 pr_info("Failed to dump metalist\n");
631         }
632 
633         return skb->len;
634 
635 nla_put_failure:
636         nlmsg_trim(skb, b);
637         return -1;
638 }
639 
640 static int find_decode_metaid(struct sk_buff *skb, struct tcf_ife_info *ife,
641                               u16 metaid, u16 mlen, void *mdata)
642 {
643         struct tcf_meta_info *e;
644 
645         /* XXX: use hash to speed up */
646         list_for_each_entry(e, &ife->metalist, metalist) {
647                 if (metaid == e->metaid) {
648                         if (e->ops) {
649                                 /* We check for decode presence already */
650                                 return e->ops->decode(skb, mdata, mlen);
651                         }
652                 }
653         }
654 
655         return 0;
656 }
657 
658 static int tcf_ife_decode(struct sk_buff *skb, const struct tc_action *a,
659                           struct tcf_result *res)
660 {
661         struct tcf_ife_info *ife = to_ife(a);
662         int action = ife->tcf_action;
663         u8 *ifehdr_end;
664         u8 *tlv_data;
665         u16 metalen;
666 
667         bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
668         tcf_lastuse_update(&ife->tcf_tm);
669 
670         if (skb_at_tc_ingress(skb))
671                 skb_push(skb, skb->dev->hard_header_len);
672 
673         tlv_data = ife_decode(skb, &metalen);
674         if (unlikely(!tlv_data)) {
675                 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
676                 return TC_ACT_SHOT;
677         }
678 
679         ifehdr_end = tlv_data + metalen;
680         for (; tlv_data < ifehdr_end; tlv_data = ife_tlv_meta_next(tlv_data)) {
681                 u8 *curr_data;
682                 u16 mtype;
683                 u16 dlen;
684 
685                 curr_data = ife_tlv_meta_decode(tlv_data, &mtype, &dlen, NULL);
686 
687                 if (find_decode_metaid(skb, ife, mtype, dlen, curr_data)) {
688                         /* abuse overlimits to count when we receive metadata
689                          * but dont have an ops for it
690                          */
691                         pr_info_ratelimited("Unknown metaid %d dlen %d\n",
692                                             mtype, dlen);
693                         qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
694                 }
695         }
696 
697         if (WARN_ON(tlv_data != ifehdr_end)) {
698                 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
699                 return TC_ACT_SHOT;
700         }
701 
702         skb->protocol = eth_type_trans(skb, skb->dev);
703         skb_reset_network_header(skb);
704 
705         return action;
706 }
707 
708 /*XXX: check if we can do this at install time instead of current
709  * send data path
710 **/
711 static int ife_get_sz(struct sk_buff *skb, struct tcf_ife_info *ife)
712 {
713         struct tcf_meta_info *e, *n;
714         int tot_run_sz = 0, run_sz = 0;
715 
716         list_for_each_entry_safe(e, n, &ife->metalist, metalist) {
717                 if (e->ops->check_presence) {
718                         run_sz = e->ops->check_presence(skb, e);
719                         tot_run_sz += run_sz;
720                 }
721         }
722 
723         return tot_run_sz;
724 }
725 
726 static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
727                           struct tcf_result *res, struct tcf_ife_params *p)
728 {
729         struct tcf_ife_info *ife = to_ife(a);
730         int action = ife->tcf_action;
731         struct ethhdr *oethh;   /* outer ether header */
732         struct tcf_meta_info *e;
733         /*
734            OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
735            where ORIGDATA = original ethernet header ...
736          */
737         u16 metalen = ife_get_sz(skb, ife);
738         int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
739         unsigned int skboff = 0;
740         int new_len = skb->len + hdrm;
741         bool exceed_mtu = false;
742         void *ife_meta;
743         int err = 0;
744 
745         if (!skb_at_tc_ingress(skb)) {
746                 if (new_len > skb->dev->mtu)
747                         exceed_mtu = true;
748         }
749 
750         bstats_cpu_update(this_cpu_ptr(ife->common.cpu_bstats), skb);
751         tcf_lastuse_update(&ife->tcf_tm);
752 
753         if (!metalen) {         /* no metadata to send */
754                 /* abuse overlimits to count when we allow packet
755                  * with no metadata
756                  */
757                 qstats_overlimit_inc(this_cpu_ptr(ife->common.cpu_qstats));
758                 return action;
759         }
760         /* could be stupid policy setup or mtu config
761          * so lets be conservative.. */
762         if ((action == TC_ACT_SHOT) || exceed_mtu) {
763                 qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
764                 return TC_ACT_SHOT;
765         }
766 
767         if (skb_at_tc_ingress(skb))
768                 skb_push(skb, skb->dev->hard_header_len);
769 
770         ife_meta = ife_encode(skb, metalen);
771 
772         spin_lock(&ife->tcf_lock);
773 
774         /* XXX: we dont have a clever way of telling encode to
775          * not repeat some of the computations that are done by
776          * ops->presence_check...
777          */
778         list_for_each_entry(e, &ife->metalist, metalist) {
779                 if (e->ops->encode) {
780                         err = e->ops->encode(skb, (void *)(ife_meta + skboff),
781                                              e);
782                 }
783                 if (err < 0) {
784                         /* too corrupt to keep around if overwritten */
785                         spin_unlock(&ife->tcf_lock);
786                         qstats_drop_inc(this_cpu_ptr(ife->common.cpu_qstats));
787                         return TC_ACT_SHOT;
788                 }
789                 skboff += err;
790         }
791         spin_unlock(&ife->tcf_lock);
792         oethh = (struct ethhdr *)skb->data;
793 
794         if (!is_zero_ether_addr(p->eth_src))
795                 ether_addr_copy(oethh->h_source, p->eth_src);
796         if (!is_zero_ether_addr(p->eth_dst))
797                 ether_addr_copy(oethh->h_dest, p->eth_dst);
798         oethh->h_proto = htons(p->eth_type);
799 
800         if (skb_at_tc_ingress(skb))
801                 skb_pull(skb, skb->dev->hard_header_len);
802 
803         return action;
804 }
805 
806 static int tcf_ife_act(struct sk_buff *skb, const struct tc_action *a,
807                        struct tcf_result *res)
808 {
809         struct tcf_ife_info *ife = to_ife(a);
810         struct tcf_ife_params *p;
811         int ret;
812 
813         rcu_read_lock();
814         p = rcu_dereference(ife->params);
815         if (p->flags & IFE_ENCODE) {
816                 ret = tcf_ife_encode(skb, a, res, p);
817                 rcu_read_unlock();
818                 return ret;
819         }
820         rcu_read_unlock();
821 
822         return tcf_ife_decode(skb, a, res);
823 }
824 
825 static int tcf_ife_walker(struct net *net, struct sk_buff *skb,
826                           struct netlink_callback *cb, int type,
827                           const struct tc_action_ops *ops)
828 {
829         struct tc_action_net *tn = net_generic(net, ife_net_id);
830 
831         return tcf_generic_walker(tn, skb, cb, type, ops);
832 }
833 
834 static int tcf_ife_search(struct net *net, struct tc_action **a, u32 index)
835 {
836         struct tc_action_net *tn = net_generic(net, ife_net_id);
837 
838         return tcf_idr_search(tn, a, index);
839 }
840 
841 static struct tc_action_ops act_ife_ops = {
842         .kind = "ife",
843         .type = TCA_ACT_IFE,
844         .owner = THIS_MODULE,
845         .act = tcf_ife_act,
846         .dump = tcf_ife_dump,
847         .cleanup = tcf_ife_cleanup,
848         .init = tcf_ife_init,
849         .walk = tcf_ife_walker,
850         .lookup = tcf_ife_search,
851         .size = sizeof(struct tcf_ife_info),
852 };
853 
854 static __net_init int ife_init_net(struct net *net)
855 {
856         struct tc_action_net *tn = net_generic(net, ife_net_id);
857 
858         return tc_action_net_init(tn, &act_ife_ops);
859 }
860 
861 static void __net_exit ife_exit_net(struct net *net)
862 {
863         struct tc_action_net *tn = net_generic(net, ife_net_id);
864 
865         tc_action_net_exit(tn);
866 }
867 
868 static struct pernet_operations ife_net_ops = {
869         .init = ife_init_net,
870         .exit = ife_exit_net,
871         .id   = &ife_net_id,
872         .size = sizeof(struct tc_action_net),
873 };
874 
875 static int __init ife_init_module(void)
876 {
877         return tcf_register_action(&act_ife_ops, &ife_net_ops);
878 }
879 
880 static void __exit ife_cleanup_module(void)
881 {
882         tcf_unregister_action(&act_ife_ops, &ife_net_ops);
883 }
884 
885 module_init(ife_init_module);
886 module_exit(ife_cleanup_module);
887 
888 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
889 MODULE_DESCRIPTION("Inter-FE LFB action");
890 MODULE_LICENSE("GPL");
891 

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