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Linux/net/ieee802154/6lowpan/reassembly.c

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  1 /*      6LoWPAN fragment reassembly
  2  *
  3  *
  4  *      Authors:
  5  *      Alexander Aring         <aar@pengutronix.de>
  6  *
  7  *      Based on: net/ipv6/reassembly.c
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 #define pr_fmt(fmt) "6LoWPAN: " fmt
 16 
 17 #include <linux/net.h>
 18 #include <linux/list.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/random.h>
 21 #include <linux/jhash.h>
 22 #include <linux/skbuff.h>
 23 #include <linux/slab.h>
 24 #include <linux/export.h>
 25 
 26 #include <net/ieee802154_netdev.h>
 27 #include <net/6lowpan.h>
 28 #include <net/ipv6.h>
 29 #include <net/inet_frag.h>
 30 
 31 #include "6lowpan_i.h"
 32 
 33 static const char lowpan_frags_cache_name[] = "lowpan-frags";
 34 
 35 static struct inet_frags lowpan_frags;
 36 
 37 static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
 38                              struct sk_buff *prev, struct net_device *ldev);
 39 
 40 static unsigned int lowpan_hash_frag(u16 tag, u16 d_size,
 41                                      const struct ieee802154_addr *saddr,
 42                                      const struct ieee802154_addr *daddr)
 43 {
 44         net_get_random_once(&lowpan_frags.rnd, sizeof(lowpan_frags.rnd));
 45         return jhash_3words(ieee802154_addr_hash(saddr),
 46                             ieee802154_addr_hash(daddr),
 47                             (__force u32)(tag + (d_size << 16)),
 48                             lowpan_frags.rnd);
 49 }
 50 
 51 static unsigned int lowpan_hashfn(const struct inet_frag_queue *q)
 52 {
 53         const struct lowpan_frag_queue *fq;
 54 
 55         fq = container_of(q, struct lowpan_frag_queue, q);
 56         return lowpan_hash_frag(fq->tag, fq->d_size, &fq->saddr, &fq->daddr);
 57 }
 58 
 59 static bool lowpan_frag_match(const struct inet_frag_queue *q, const void *a)
 60 {
 61         const struct lowpan_frag_queue *fq;
 62         const struct lowpan_create_arg *arg = a;
 63 
 64         fq = container_of(q, struct lowpan_frag_queue, q);
 65         return  fq->tag == arg->tag && fq->d_size == arg->d_size &&
 66                 ieee802154_addr_equal(&fq->saddr, arg->src) &&
 67                 ieee802154_addr_equal(&fq->daddr, arg->dst);
 68 }
 69 
 70 static void lowpan_frag_init(struct inet_frag_queue *q, const void *a)
 71 {
 72         const struct lowpan_create_arg *arg = a;
 73         struct lowpan_frag_queue *fq;
 74 
 75         fq = container_of(q, struct lowpan_frag_queue, q);
 76 
 77         fq->tag = arg->tag;
 78         fq->d_size = arg->d_size;
 79         fq->saddr = *arg->src;
 80         fq->daddr = *arg->dst;
 81 }
 82 
 83 static void lowpan_frag_expire(unsigned long data)
 84 {
 85         struct frag_queue *fq;
 86         struct net *net;
 87 
 88         fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
 89         net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags);
 90 
 91         spin_lock(&fq->q.lock);
 92 
 93         if (fq->q.flags & INET_FRAG_COMPLETE)
 94                 goto out;
 95 
 96         inet_frag_kill(&fq->q, &lowpan_frags);
 97 out:
 98         spin_unlock(&fq->q.lock);
 99         inet_frag_put(&fq->q, &lowpan_frags);
100 }
101 
102 static inline struct lowpan_frag_queue *
103 fq_find(struct net *net, const struct lowpan_802154_cb *cb,
104         const struct ieee802154_addr *src,
105         const struct ieee802154_addr *dst)
106 {
107         struct inet_frag_queue *q;
108         struct lowpan_create_arg arg;
109         unsigned int hash;
110         struct netns_ieee802154_lowpan *ieee802154_lowpan =
111                 net_ieee802154_lowpan(net);
112 
113         arg.tag = cb->d_tag;
114         arg.d_size = cb->d_size;
115         arg.src = src;
116         arg.dst = dst;
117 
118         hash = lowpan_hash_frag(cb->d_tag, cb->d_size, src, dst);
119 
120         q = inet_frag_find(&ieee802154_lowpan->frags,
121                            &lowpan_frags, &arg, hash);
122         if (IS_ERR_OR_NULL(q)) {
123                 inet_frag_maybe_warn_overflow(q, pr_fmt());
124                 return NULL;
125         }
126         return container_of(q, struct lowpan_frag_queue, q);
127 }
128 
129 static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
130                              struct sk_buff *skb, u8 frag_type)
131 {
132         struct sk_buff *prev, *next;
133         struct net_device *ldev;
134         int end, offset;
135 
136         if (fq->q.flags & INET_FRAG_COMPLETE)
137                 goto err;
138 
139         offset = lowpan_802154_cb(skb)->d_offset << 3;
140         end = lowpan_802154_cb(skb)->d_size;
141 
142         /* Is this the final fragment? */
143         if (offset + skb->len == end) {
144                 /* If we already have some bits beyond end
145                  * or have different end, the segment is corrupted.
146                  */
147                 if (end < fq->q.len ||
148                     ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
149                         goto err;
150                 fq->q.flags |= INET_FRAG_LAST_IN;
151                 fq->q.len = end;
152         } else {
153                 if (end > fq->q.len) {
154                         /* Some bits beyond end -> corruption. */
155                         if (fq->q.flags & INET_FRAG_LAST_IN)
156                                 goto err;
157                         fq->q.len = end;
158                 }
159         }
160 
161         /* Find out which fragments are in front and at the back of us
162          * in the chain of fragments so far.  We must know where to put
163          * this fragment, right?
164          */
165         prev = fq->q.fragments_tail;
166         if (!prev ||
167             lowpan_802154_cb(prev)->d_offset <
168             lowpan_802154_cb(skb)->d_offset) {
169                 next = NULL;
170                 goto found;
171         }
172         prev = NULL;
173         for (next = fq->q.fragments; next != NULL; next = next->next) {
174                 if (lowpan_802154_cb(next)->d_offset >=
175                     lowpan_802154_cb(skb)->d_offset)
176                         break;  /* bingo! */
177                 prev = next;
178         }
179 
180 found:
181         /* Insert this fragment in the chain of fragments. */
182         skb->next = next;
183         if (!next)
184                 fq->q.fragments_tail = skb;
185         if (prev)
186                 prev->next = skb;
187         else
188                 fq->q.fragments = skb;
189 
190         ldev = skb->dev;
191         if (ldev)
192                 skb->dev = NULL;
193 
194         fq->q.stamp = skb->tstamp;
195         if (frag_type == LOWPAN_DISPATCH_FRAG1)
196                 fq->q.flags |= INET_FRAG_FIRST_IN;
197 
198         fq->q.meat += skb->len;
199         add_frag_mem_limit(fq->q.net, skb->truesize);
200 
201         if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
202             fq->q.meat == fq->q.len) {
203                 int res;
204                 unsigned long orefdst = skb->_skb_refdst;
205 
206                 skb->_skb_refdst = 0UL;
207                 res = lowpan_frag_reasm(fq, prev, ldev);
208                 skb->_skb_refdst = orefdst;
209                 return res;
210         }
211 
212         return -1;
213 err:
214         kfree_skb(skb);
215         return -1;
216 }
217 
218 /*      Check if this packet is complete.
219  *      Returns NULL on failure by any reason, and pointer
220  *      to current nexthdr field in reassembled frame.
221  *
222  *      It is called with locked fq, and caller must check that
223  *      queue is eligible for reassembly i.e. it is not COMPLETE,
224  *      the last and the first frames arrived and all the bits are here.
225  */
226 static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev,
227                              struct net_device *ldev)
228 {
229         struct sk_buff *fp, *head = fq->q.fragments;
230         int sum_truesize;
231 
232         inet_frag_kill(&fq->q, &lowpan_frags);
233 
234         /* Make the one we just received the head. */
235         if (prev) {
236                 head = prev->next;
237                 fp = skb_clone(head, GFP_ATOMIC);
238 
239                 if (!fp)
240                         goto out_oom;
241 
242                 fp->next = head->next;
243                 if (!fp->next)
244                         fq->q.fragments_tail = fp;
245                 prev->next = fp;
246 
247                 skb_morph(head, fq->q.fragments);
248                 head->next = fq->q.fragments->next;
249 
250                 consume_skb(fq->q.fragments);
251                 fq->q.fragments = head;
252         }
253 
254         /* Head of list must not be cloned. */
255         if (skb_unclone(head, GFP_ATOMIC))
256                 goto out_oom;
257 
258         /* If the first fragment is fragmented itself, we split
259          * it to two chunks: the first with data and paged part
260          * and the second, holding only fragments.
261          */
262         if (skb_has_frag_list(head)) {
263                 struct sk_buff *clone;
264                 int i, plen = 0;
265 
266                 clone = alloc_skb(0, GFP_ATOMIC);
267                 if (!clone)
268                         goto out_oom;
269                 clone->next = head->next;
270                 head->next = clone;
271                 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
272                 skb_frag_list_init(head);
273                 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
274                         plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
275                 clone->len = head->data_len - plen;
276                 clone->data_len = clone->len;
277                 head->data_len -= clone->len;
278                 head->len -= clone->len;
279                 add_frag_mem_limit(fq->q.net, clone->truesize);
280         }
281 
282         WARN_ON(head == NULL);
283 
284         sum_truesize = head->truesize;
285         for (fp = head->next; fp;) {
286                 bool headstolen;
287                 int delta;
288                 struct sk_buff *next = fp->next;
289 
290                 sum_truesize += fp->truesize;
291                 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
292                         kfree_skb_partial(fp, headstolen);
293                 } else {
294                         if (!skb_shinfo(head)->frag_list)
295                                 skb_shinfo(head)->frag_list = fp;
296                         head->data_len += fp->len;
297                         head->len += fp->len;
298                         head->truesize += fp->truesize;
299                 }
300                 fp = next;
301         }
302         sub_frag_mem_limit(fq->q.net, sum_truesize);
303 
304         head->next = NULL;
305         head->dev = ldev;
306         head->tstamp = fq->q.stamp;
307 
308         fq->q.fragments = NULL;
309         fq->q.fragments_tail = NULL;
310 
311         return 1;
312 out_oom:
313         net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n");
314         return -1;
315 }
316 
317 static int lowpan_frag_rx_handlers_result(struct sk_buff *skb,
318                                           lowpan_rx_result res)
319 {
320         switch (res) {
321         case RX_QUEUED:
322                 return NET_RX_SUCCESS;
323         case RX_CONTINUE:
324                 /* nobody cared about this packet */
325                 net_warn_ratelimited("%s: received unknown dispatch\n",
326                                      __func__);
327 
328                 /* fall-through */
329         default:
330                 /* all others failure */
331                 return NET_RX_DROP;
332         }
333 }
334 
335 static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb)
336 {
337         int ret;
338 
339         if (!lowpan_is_iphc(*skb_network_header(skb)))
340                 return RX_CONTINUE;
341 
342         ret = lowpan_iphc_decompress(skb);
343         if (ret < 0)
344                 return RX_DROP;
345 
346         return RX_QUEUED;
347 }
348 
349 static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb)
350 {
351         lowpan_rx_result res;
352 
353 #define CALL_RXH(rxh)                   \
354         do {                            \
355                 res = rxh(skb); \
356                 if (res != RX_CONTINUE) \
357                         goto rxh_next;  \
358         } while (0)
359 
360         /* likely at first */
361         CALL_RXH(lowpan_frag_rx_h_iphc);
362         CALL_RXH(lowpan_rx_h_ipv6);
363 
364 rxh_next:
365         return lowpan_frag_rx_handlers_result(skb, res);
366 #undef CALL_RXH
367 }
368 
369 #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK        0x07
370 #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT       8
371 
372 static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type,
373                          struct lowpan_802154_cb *cb)
374 {
375         bool fail;
376         u8 high = 0, low = 0;
377         __be16 d_tag = 0;
378 
379         fail = lowpan_fetch_skb(skb, &high, 1);
380         fail |= lowpan_fetch_skb(skb, &low, 1);
381         /* remove the dispatch value and use first three bits as high value
382          * for the datagram size
383          */
384         cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) <<
385                 LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low;
386         fail |= lowpan_fetch_skb(skb, &d_tag, 2);
387         cb->d_tag = ntohs(d_tag);
388 
389         if (frag_type == LOWPAN_DISPATCH_FRAGN) {
390                 fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1);
391         } else {
392                 skb_reset_network_header(skb);
393                 cb->d_offset = 0;
394                 /* check if datagram_size has ipv6hdr on FRAG1 */
395                 fail |= cb->d_size < sizeof(struct ipv6hdr);
396                 /* check if we can dereference the dispatch value */
397                 fail |= !skb->len;
398         }
399 
400         if (unlikely(fail))
401                 return -EIO;
402 
403         return 0;
404 }
405 
406 int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type)
407 {
408         struct lowpan_frag_queue *fq;
409         struct net *net = dev_net(skb->dev);
410         struct lowpan_802154_cb *cb = lowpan_802154_cb(skb);
411         struct ieee802154_hdr hdr;
412         int err;
413 
414         if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
415                 goto err;
416 
417         err = lowpan_get_cb(skb, frag_type, cb);
418         if (err < 0)
419                 goto err;
420 
421         if (frag_type == LOWPAN_DISPATCH_FRAG1) {
422                 err = lowpan_invoke_frag_rx_handlers(skb);
423                 if (err == NET_RX_DROP)
424                         goto err;
425         }
426 
427         if (cb->d_size > IPV6_MIN_MTU) {
428                 net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n");
429                 goto err;
430         }
431 
432         fq = fq_find(net, cb, &hdr.source, &hdr.dest);
433         if (fq != NULL) {
434                 int ret;
435 
436                 spin_lock(&fq->q.lock);
437                 ret = lowpan_frag_queue(fq, skb, frag_type);
438                 spin_unlock(&fq->q.lock);
439 
440                 inet_frag_put(&fq->q, &lowpan_frags);
441                 return ret;
442         }
443 
444 err:
445         kfree_skb(skb);
446         return -1;
447 }
448 
449 #ifdef CONFIG_SYSCTL
450 static int zero;
451 
452 static struct ctl_table lowpan_frags_ns_ctl_table[] = {
453         {
454                 .procname       = "6lowpanfrag_high_thresh",
455                 .data           = &init_net.ieee802154_lowpan.frags.high_thresh,
456                 .maxlen         = sizeof(int),
457                 .mode           = 0644,
458                 .proc_handler   = proc_dointvec_minmax,
459                 .extra1         = &init_net.ieee802154_lowpan.frags.low_thresh
460         },
461         {
462                 .procname       = "6lowpanfrag_low_thresh",
463                 .data           = &init_net.ieee802154_lowpan.frags.low_thresh,
464                 .maxlen         = sizeof(int),
465                 .mode           = 0644,
466                 .proc_handler   = proc_dointvec_minmax,
467                 .extra1         = &zero,
468                 .extra2         = &init_net.ieee802154_lowpan.frags.high_thresh
469         },
470         {
471                 .procname       = "6lowpanfrag_time",
472                 .data           = &init_net.ieee802154_lowpan.frags.timeout,
473                 .maxlen         = sizeof(int),
474                 .mode           = 0644,
475                 .proc_handler   = proc_dointvec_jiffies,
476         },
477         { }
478 };
479 
480 /* secret interval has been deprecated */
481 static int lowpan_frags_secret_interval_unused;
482 static struct ctl_table lowpan_frags_ctl_table[] = {
483         {
484                 .procname       = "6lowpanfrag_secret_interval",
485                 .data           = &lowpan_frags_secret_interval_unused,
486                 .maxlen         = sizeof(int),
487                 .mode           = 0644,
488                 .proc_handler   = proc_dointvec_jiffies,
489         },
490         { }
491 };
492 
493 static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
494 {
495         struct ctl_table *table;
496         struct ctl_table_header *hdr;
497         struct netns_ieee802154_lowpan *ieee802154_lowpan =
498                 net_ieee802154_lowpan(net);
499 
500         table = lowpan_frags_ns_ctl_table;
501         if (!net_eq(net, &init_net)) {
502                 table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table),
503                                 GFP_KERNEL);
504                 if (table == NULL)
505                         goto err_alloc;
506 
507                 table[0].data = &ieee802154_lowpan->frags.high_thresh;
508                 table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
509                 table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
510                 table[1].data = &ieee802154_lowpan->frags.low_thresh;
511                 table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
512                 table[2].data = &ieee802154_lowpan->frags.timeout;
513 
514                 /* Don't export sysctls to unprivileged users */
515                 if (net->user_ns != &init_user_ns)
516                         table[0].procname = NULL;
517         }
518 
519         hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table);
520         if (hdr == NULL)
521                 goto err_reg;
522 
523         ieee802154_lowpan->sysctl.frags_hdr = hdr;
524         return 0;
525 
526 err_reg:
527         if (!net_eq(net, &init_net))
528                 kfree(table);
529 err_alloc:
530         return -ENOMEM;
531 }
532 
533 static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net)
534 {
535         struct ctl_table *table;
536         struct netns_ieee802154_lowpan *ieee802154_lowpan =
537                 net_ieee802154_lowpan(net);
538 
539         table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg;
540         unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr);
541         if (!net_eq(net, &init_net))
542                 kfree(table);
543 }
544 
545 static struct ctl_table_header *lowpan_ctl_header;
546 
547 static int __init lowpan_frags_sysctl_register(void)
548 {
549         lowpan_ctl_header = register_net_sysctl(&init_net,
550                                                 "net/ieee802154/6lowpan",
551                                                 lowpan_frags_ctl_table);
552         return lowpan_ctl_header == NULL ? -ENOMEM : 0;
553 }
554 
555 static void lowpan_frags_sysctl_unregister(void)
556 {
557         unregister_net_sysctl_table(lowpan_ctl_header);
558 }
559 #else
560 static inline int lowpan_frags_ns_sysctl_register(struct net *net)
561 {
562         return 0;
563 }
564 
565 static inline void lowpan_frags_ns_sysctl_unregister(struct net *net)
566 {
567 }
568 
569 static inline int __init lowpan_frags_sysctl_register(void)
570 {
571         return 0;
572 }
573 
574 static inline void lowpan_frags_sysctl_unregister(void)
575 {
576 }
577 #endif
578 
579 static int __net_init lowpan_frags_init_net(struct net *net)
580 {
581         struct netns_ieee802154_lowpan *ieee802154_lowpan =
582                 net_ieee802154_lowpan(net);
583         int res;
584 
585         ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
586         ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH;
587         ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT;
588 
589         res = inet_frags_init_net(&ieee802154_lowpan->frags);
590         if (res)
591                 return res;
592         res = lowpan_frags_ns_sysctl_register(net);
593         if (res)
594                 inet_frags_uninit_net(&ieee802154_lowpan->frags);
595         return res;
596 }
597 
598 static void __net_exit lowpan_frags_exit_net(struct net *net)
599 {
600         struct netns_ieee802154_lowpan *ieee802154_lowpan =
601                 net_ieee802154_lowpan(net);
602 
603         lowpan_frags_ns_sysctl_unregister(net);
604         inet_frags_exit_net(&ieee802154_lowpan->frags, &lowpan_frags);
605 }
606 
607 static struct pernet_operations lowpan_frags_ops = {
608         .init = lowpan_frags_init_net,
609         .exit = lowpan_frags_exit_net,
610 };
611 
612 int __init lowpan_net_frag_init(void)
613 {
614         int ret;
615 
616         ret = lowpan_frags_sysctl_register();
617         if (ret)
618                 return ret;
619 
620         ret = register_pernet_subsys(&lowpan_frags_ops);
621         if (ret)
622                 goto err_pernet;
623 
624         lowpan_frags.hashfn = lowpan_hashfn;
625         lowpan_frags.constructor = lowpan_frag_init;
626         lowpan_frags.destructor = NULL;
627         lowpan_frags.qsize = sizeof(struct frag_queue);
628         lowpan_frags.match = lowpan_frag_match;
629         lowpan_frags.frag_expire = lowpan_frag_expire;
630         lowpan_frags.frags_cache_name = lowpan_frags_cache_name;
631         ret = inet_frags_init(&lowpan_frags);
632         if (ret)
633                 goto err_pernet;
634 
635         return ret;
636 err_pernet:
637         lowpan_frags_sysctl_unregister();
638         return ret;
639 }
640 
641 void lowpan_net_frag_exit(void)
642 {
643         inet_frags_fini(&lowpan_frags);
644         lowpan_frags_sysctl_unregister();
645         unregister_pernet_subsys(&lowpan_frags_ops);
646 }
647 

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