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Commit | Line | Data |
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7240cdec AA |
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> | |
cefc8c8a | 27 | #include <net/6lowpan.h> |
7240cdec AA |
28 | #include <net/ipv6.h> |
29 | #include <net/inet_frag.h> | |
30 | ||
8691ee59 | 31 | #include "6lowpan_i.h" |
7240cdec | 32 | |
d4ad4d22 NA |
33 | static const char lowpan_frags_cache_name[] = "lowpan-frags"; |
34 | ||
7240cdec AA |
35 | static struct inet_frags lowpan_frags; |
36 | ||
37 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, | |
f4606583 | 38 | struct sk_buff *prev, struct net_device *ldev); |
7240cdec | 39 | |
f870b8c6 | 40 | static unsigned int lowpan_hash_frag(u16 tag, u16 d_size, |
ae531b94 PB |
41 | const struct ieee802154_addr *saddr, |
42 | const struct ieee802154_addr *daddr) | |
7240cdec | 43 | { |
7240cdec | 44 | net_get_random_once(&lowpan_frags.rnd, sizeof(lowpan_frags.rnd)); |
fb3cfe6e FW |
45 | return jhash_3words(ieee802154_addr_hash(saddr), |
46 | ieee802154_addr_hash(daddr), | |
47 | (__force u32)(tag + (d_size << 16)), | |
48 | lowpan_frags.rnd); | |
7240cdec AA |
49 | } |
50 | ||
36c77782 | 51 | static unsigned int lowpan_hashfn(const struct inet_frag_queue *q) |
7240cdec | 52 | { |
36c77782 | 53 | const struct lowpan_frag_queue *fq; |
7240cdec AA |
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 | ||
36c77782 | 59 | static bool lowpan_frag_match(const struct inet_frag_queue *q, const void *a) |
7240cdec | 60 | { |
36c77782 FW |
61 | const struct lowpan_frag_queue *fq; |
62 | const struct lowpan_create_arg *arg = a; | |
7240cdec AA |
63 | |
64 | fq = container_of(q, struct lowpan_frag_queue, q); | |
65 | return fq->tag == arg->tag && fq->d_size == arg->d_size && | |
ae531b94 PB |
66 | ieee802154_addr_equal(&fq->saddr, arg->src) && |
67 | ieee802154_addr_equal(&fq->daddr, arg->dst); | |
7240cdec | 68 | } |
7240cdec | 69 | |
36c77782 | 70 | static void lowpan_frag_init(struct inet_frag_queue *q, const void *a) |
7240cdec | 71 | { |
36c77782 | 72 | const struct lowpan_create_arg *arg = a; |
7240cdec | 73 | struct lowpan_frag_queue *fq; |
7240cdec AA |
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 | } | |
7240cdec | 82 | |
78802011 | 83 | static void lowpan_frag_expire(struct timer_list *t) |
7240cdec | 84 | { |
78802011 | 85 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
7240cdec AA |
86 | struct frag_queue *fq; |
87 | struct net *net; | |
88 | ||
78802011 | 89 | fq = container_of(frag, struct frag_queue, q); |
7240cdec AA |
90 | net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags); |
91 | ||
17794326 FW |
92 | spin_lock(&fq->q.lock); |
93 | ||
06aa8b8a | 94 | if (fq->q.flags & INET_FRAG_COMPLETE) |
17794326 FW |
95 | goto out; |
96 | ||
97 | inet_frag_kill(&fq->q, &lowpan_frags); | |
98 | out: | |
99 | spin_unlock(&fq->q.lock); | |
100 | inet_frag_put(&fq->q, &lowpan_frags); | |
7240cdec AA |
101 | } |
102 | ||
103 | static inline struct lowpan_frag_queue * | |
72a5e6bb | 104 | fq_find(struct net *net, const struct lowpan_802154_cb *cb, |
ae531b94 PB |
105 | const struct ieee802154_addr *src, |
106 | const struct ieee802154_addr *dst) | |
7240cdec AA |
107 | { |
108 | struct inet_frag_queue *q; | |
109 | struct lowpan_create_arg arg; | |
110 | unsigned int hash; | |
599018a7 LR |
111 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
112 | net_ieee802154_lowpan(net); | |
7240cdec | 113 | |
72a5e6bb AA |
114 | arg.tag = cb->d_tag; |
115 | arg.d_size = cb->d_size; | |
7240cdec AA |
116 | arg.src = src; |
117 | arg.dst = dst; | |
118 | ||
72a5e6bb | 119 | hash = lowpan_hash_frag(cb->d_tag, cb->d_size, src, dst); |
7240cdec | 120 | |
599018a7 | 121 | q = inet_frag_find(&ieee802154_lowpan->frags, |
7240cdec AA |
122 | &lowpan_frags, &arg, hash); |
123 | if (IS_ERR_OR_NULL(q)) { | |
124 | inet_frag_maybe_warn_overflow(q, pr_fmt()); | |
125 | return NULL; | |
126 | } | |
127 | return container_of(q, struct lowpan_frag_queue, q); | |
128 | } | |
129 | ||
130 | static int lowpan_frag_queue(struct lowpan_frag_queue *fq, | |
72a5e6bb | 131 | struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
132 | { |
133 | struct sk_buff *prev, *next; | |
f4606583 | 134 | struct net_device *ldev; |
7240cdec AA |
135 | int end, offset; |
136 | ||
06aa8b8a | 137 | if (fq->q.flags & INET_FRAG_COMPLETE) |
7240cdec AA |
138 | goto err; |
139 | ||
72a5e6bb AA |
140 | offset = lowpan_802154_cb(skb)->d_offset << 3; |
141 | end = lowpan_802154_cb(skb)->d_size; | |
7240cdec AA |
142 | |
143 | /* Is this the final fragment? */ | |
144 | if (offset + skb->len == end) { | |
145 | /* If we already have some bits beyond end | |
146 | * or have different end, the segment is corrupted. | |
147 | */ | |
148 | if (end < fq->q.len || | |
06aa8b8a | 149 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
7240cdec | 150 | goto err; |
06aa8b8a | 151 | fq->q.flags |= INET_FRAG_LAST_IN; |
7240cdec AA |
152 | fq->q.len = end; |
153 | } else { | |
154 | if (end > fq->q.len) { | |
155 | /* Some bits beyond end -> corruption. */ | |
06aa8b8a | 156 | if (fq->q.flags & INET_FRAG_LAST_IN) |
7240cdec AA |
157 | goto err; |
158 | fq->q.len = end; | |
159 | } | |
160 | } | |
161 | ||
162 | /* Find out which fragments are in front and at the back of us | |
163 | * in the chain of fragments so far. We must know where to put | |
164 | * this fragment, right? | |
165 | */ | |
166 | prev = fq->q.fragments_tail; | |
72a5e6bb AA |
167 | if (!prev || |
168 | lowpan_802154_cb(prev)->d_offset < | |
169 | lowpan_802154_cb(skb)->d_offset) { | |
7240cdec AA |
170 | next = NULL; |
171 | goto found; | |
172 | } | |
173 | prev = NULL; | |
174 | for (next = fq->q.fragments; next != NULL; next = next->next) { | |
72a5e6bb AA |
175 | if (lowpan_802154_cb(next)->d_offset >= |
176 | lowpan_802154_cb(skb)->d_offset) | |
7240cdec AA |
177 | break; /* bingo! */ |
178 | prev = next; | |
179 | } | |
180 | ||
181 | found: | |
182 | /* Insert this fragment in the chain of fragments. */ | |
183 | skb->next = next; | |
184 | if (!next) | |
185 | fq->q.fragments_tail = skb; | |
186 | if (prev) | |
187 | prev->next = skb; | |
188 | else | |
189 | fq->q.fragments = skb; | |
190 | ||
f4606583 AA |
191 | ldev = skb->dev; |
192 | if (ldev) | |
7240cdec AA |
193 | skb->dev = NULL; |
194 | ||
195 | fq->q.stamp = skb->tstamp; | |
72a5e6bb | 196 | if (frag_type == LOWPAN_DISPATCH_FRAG1) |
06aa8b8a | 197 | fq->q.flags |= INET_FRAG_FIRST_IN; |
72a5e6bb AA |
198 | |
199 | fq->q.meat += skb->len; | |
0e60d245 | 200 | add_frag_mem_limit(fq->q.net, skb->truesize); |
7240cdec | 201 | |
06aa8b8a | 202 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
7240cdec AA |
203 | fq->q.meat == fq->q.len) { |
204 | int res; | |
205 | unsigned long orefdst = skb->_skb_refdst; | |
206 | ||
207 | skb->_skb_refdst = 0UL; | |
f4606583 | 208 | res = lowpan_frag_reasm(fq, prev, ldev); |
7240cdec AA |
209 | skb->_skb_refdst = orefdst; |
210 | return res; | |
211 | } | |
212 | ||
7240cdec AA |
213 | return -1; |
214 | err: | |
215 | kfree_skb(skb); | |
216 | return -1; | |
217 | } | |
218 | ||
219 | /* Check if this packet is complete. | |
220 | * Returns NULL on failure by any reason, and pointer | |
221 | * to current nexthdr field in reassembled frame. | |
222 | * | |
223 | * It is called with locked fq, and caller must check that | |
224 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
225 | * the last and the first frames arrived and all the bits are here. | |
226 | */ | |
227 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev, | |
f4606583 | 228 | struct net_device *ldev) |
7240cdec AA |
229 | { |
230 | struct sk_buff *fp, *head = fq->q.fragments; | |
231 | int sum_truesize; | |
232 | ||
233 | inet_frag_kill(&fq->q, &lowpan_frags); | |
234 | ||
235 | /* Make the one we just received the head. */ | |
236 | if (prev) { | |
237 | head = prev->next; | |
238 | fp = skb_clone(head, GFP_ATOMIC); | |
239 | ||
240 | if (!fp) | |
241 | goto out_oom; | |
242 | ||
243 | fp->next = head->next; | |
244 | if (!fp->next) | |
245 | fq->q.fragments_tail = fp; | |
246 | prev->next = fp; | |
247 | ||
248 | skb_morph(head, fq->q.fragments); | |
249 | head->next = fq->q.fragments->next; | |
250 | ||
251 | consume_skb(fq->q.fragments); | |
252 | fq->q.fragments = head; | |
253 | } | |
254 | ||
255 | /* Head of list must not be cloned. */ | |
256 | if (skb_unclone(head, GFP_ATOMIC)) | |
257 | goto out_oom; | |
258 | ||
259 | /* If the first fragment is fragmented itself, we split | |
260 | * it to two chunks: the first with data and paged part | |
261 | * and the second, holding only fragments. | |
262 | */ | |
263 | if (skb_has_frag_list(head)) { | |
264 | struct sk_buff *clone; | |
265 | int i, plen = 0; | |
266 | ||
267 | clone = alloc_skb(0, GFP_ATOMIC); | |
268 | if (!clone) | |
269 | goto out_oom; | |
270 | clone->next = head->next; | |
271 | head->next = clone; | |
272 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; | |
273 | skb_frag_list_init(head); | |
274 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) | |
275 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); | |
276 | clone->len = head->data_len - plen; | |
277 | clone->data_len = clone->len; | |
278 | head->data_len -= clone->len; | |
279 | head->len -= clone->len; | |
0e60d245 | 280 | add_frag_mem_limit(fq->q.net, clone->truesize); |
7240cdec AA |
281 | } |
282 | ||
283 | WARN_ON(head == NULL); | |
284 | ||
285 | sum_truesize = head->truesize; | |
286 | for (fp = head->next; fp;) { | |
287 | bool headstolen; | |
288 | int delta; | |
289 | struct sk_buff *next = fp->next; | |
290 | ||
291 | sum_truesize += fp->truesize; | |
292 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { | |
293 | kfree_skb_partial(fp, headstolen); | |
294 | } else { | |
295 | if (!skb_shinfo(head)->frag_list) | |
296 | skb_shinfo(head)->frag_list = fp; | |
297 | head->data_len += fp->len; | |
298 | head->len += fp->len; | |
299 | head->truesize += fp->truesize; | |
300 | } | |
301 | fp = next; | |
302 | } | |
0e60d245 | 303 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
7240cdec AA |
304 | |
305 | head->next = NULL; | |
f4606583 | 306 | head->dev = ldev; |
7240cdec AA |
307 | head->tstamp = fq->q.stamp; |
308 | ||
309 | fq->q.fragments = NULL; | |
310 | fq->q.fragments_tail = NULL; | |
311 | ||
312 | return 1; | |
313 | out_oom: | |
314 | net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n"); | |
315 | return -1; | |
316 | } | |
317 | ||
72a5e6bb AA |
318 | static int lowpan_frag_rx_handlers_result(struct sk_buff *skb, |
319 | lowpan_rx_result res) | |
320 | { | |
321 | switch (res) { | |
322 | case RX_QUEUED: | |
323 | return NET_RX_SUCCESS; | |
324 | case RX_CONTINUE: | |
325 | /* nobody cared about this packet */ | |
326 | net_warn_ratelimited("%s: received unknown dispatch\n", | |
327 | __func__); | |
328 | ||
329 | /* fall-through */ | |
330 | default: | |
331 | /* all others failure */ | |
332 | return NET_RX_DROP; | |
333 | } | |
334 | } | |
335 | ||
336 | static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb) | |
337 | { | |
338 | int ret; | |
339 | ||
340 | if (!lowpan_is_iphc(*skb_network_header(skb))) | |
341 | return RX_CONTINUE; | |
342 | ||
343 | ret = lowpan_iphc_decompress(skb); | |
344 | if (ret < 0) | |
345 | return RX_DROP; | |
346 | ||
347 | return RX_QUEUED; | |
348 | } | |
349 | ||
350 | static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb) | |
351 | { | |
352 | lowpan_rx_result res; | |
353 | ||
354 | #define CALL_RXH(rxh) \ | |
355 | do { \ | |
356 | res = rxh(skb); \ | |
357 | if (res != RX_CONTINUE) \ | |
358 | goto rxh_next; \ | |
359 | } while (0) | |
360 | ||
361 | /* likely at first */ | |
362 | CALL_RXH(lowpan_frag_rx_h_iphc); | |
363 | CALL_RXH(lowpan_rx_h_ipv6); | |
364 | ||
365 | rxh_next: | |
366 | return lowpan_frag_rx_handlers_result(skb, res); | |
367 | #undef CALL_RXH | |
368 | } | |
369 | ||
370 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07 | |
371 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8 | |
372 | ||
373 | static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type, | |
374 | struct lowpan_802154_cb *cb) | |
7240cdec AA |
375 | { |
376 | bool fail; | |
72a5e6bb | 377 | u8 high = 0, low = 0; |
f870b8c6 | 378 | __be16 d_tag = 0; |
7240cdec | 379 | |
72a5e6bb | 380 | fail = lowpan_fetch_skb(skb, &high, 1); |
7240cdec | 381 | fail |= lowpan_fetch_skb(skb, &low, 1); |
72a5e6bb AA |
382 | /* remove the dispatch value and use first three bits as high value |
383 | * for the datagram size | |
384 | */ | |
385 | cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) << | |
386 | LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low; | |
f870b8c6 | 387 | fail |= lowpan_fetch_skb(skb, &d_tag, 2); |
72a5e6bb | 388 | cb->d_tag = ntohs(d_tag); |
7240cdec AA |
389 | |
390 | if (frag_type == LOWPAN_DISPATCH_FRAGN) { | |
72a5e6bb | 391 | fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1); |
7240cdec AA |
392 | } else { |
393 | skb_reset_network_header(skb); | |
72a5e6bb AA |
394 | cb->d_offset = 0; |
395 | /* check if datagram_size has ipv6hdr on FRAG1 */ | |
396 | fail |= cb->d_size < sizeof(struct ipv6hdr); | |
397 | /* check if we can dereference the dispatch value */ | |
398 | fail |= !skb->len; | |
7240cdec AA |
399 | } |
400 | ||
401 | if (unlikely(fail)) | |
402 | return -EIO; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
72a5e6bb | 407 | int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
408 | { |
409 | struct lowpan_frag_queue *fq; | |
410 | struct net *net = dev_net(skb->dev); | |
72a5e6bb AA |
411 | struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); |
412 | struct ieee802154_hdr hdr; | |
7240cdec AA |
413 | int err; |
414 | ||
72a5e6bb AA |
415 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
416 | goto err; | |
ae531b94 | 417 | |
72a5e6bb | 418 | err = lowpan_get_cb(skb, frag_type, cb); |
7240cdec AA |
419 | if (err < 0) |
420 | goto err; | |
421 | ||
72a5e6bb AA |
422 | if (frag_type == LOWPAN_DISPATCH_FRAG1) { |
423 | err = lowpan_invoke_frag_rx_handlers(skb); | |
424 | if (err == NET_RX_DROP) | |
425 | goto err; | |
426 | } | |
427 | ||
428 | if (cb->d_size > IPV6_MIN_MTU) { | |
6697dabe | 429 | net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n"); |
7240cdec | 430 | goto err; |
6697dabe | 431 | } |
7240cdec | 432 | |
72a5e6bb | 433 | fq = fq_find(net, cb, &hdr.source, &hdr.dest); |
7240cdec AA |
434 | if (fq != NULL) { |
435 | int ret; | |
4710d806 | 436 | |
7240cdec AA |
437 | spin_lock(&fq->q.lock); |
438 | ret = lowpan_frag_queue(fq, skb, frag_type); | |
439 | spin_unlock(&fq->q.lock); | |
440 | ||
441 | inet_frag_put(&fq->q, &lowpan_frags); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | err: | |
446 | kfree_skb(skb); | |
447 | return -1; | |
448 | } | |
7240cdec AA |
449 | |
450 | #ifdef CONFIG_SYSCTL | |
1bab4c75 NA |
451 | static int zero; |
452 | ||
7240cdec AA |
453 | static struct ctl_table lowpan_frags_ns_ctl_table[] = { |
454 | { | |
455 | .procname = "6lowpanfrag_high_thresh", | |
456 | .data = &init_net.ieee802154_lowpan.frags.high_thresh, | |
457 | .maxlen = sizeof(int), | |
458 | .mode = 0644, | |
1bab4c75 NA |
459 | .proc_handler = proc_dointvec_minmax, |
460 | .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh | |
7240cdec AA |
461 | }, |
462 | { | |
463 | .procname = "6lowpanfrag_low_thresh", | |
464 | .data = &init_net.ieee802154_lowpan.frags.low_thresh, | |
465 | .maxlen = sizeof(int), | |
466 | .mode = 0644, | |
1bab4c75 NA |
467 | .proc_handler = proc_dointvec_minmax, |
468 | .extra1 = &zero, | |
469 | .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh | |
7240cdec AA |
470 | }, |
471 | { | |
472 | .procname = "6lowpanfrag_time", | |
473 | .data = &init_net.ieee802154_lowpan.frags.timeout, | |
474 | .maxlen = sizeof(int), | |
475 | .mode = 0644, | |
476 | .proc_handler = proc_dointvec_jiffies, | |
477 | }, | |
7240cdec AA |
478 | { } |
479 | }; | |
480 | ||
e3a57d18 FW |
481 | /* secret interval has been deprecated */ |
482 | static int lowpan_frags_secret_interval_unused; | |
7240cdec AA |
483 | static struct ctl_table lowpan_frags_ctl_table[] = { |
484 | { | |
485 | .procname = "6lowpanfrag_secret_interval", | |
e3a57d18 | 486 | .data = &lowpan_frags_secret_interval_unused, |
7240cdec AA |
487 | .maxlen = sizeof(int), |
488 | .mode = 0644, | |
489 | .proc_handler = proc_dointvec_jiffies, | |
490 | }, | |
491 | { } | |
492 | }; | |
493 | ||
494 | static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) | |
495 | { | |
496 | struct ctl_table *table; | |
497 | struct ctl_table_header *hdr; | |
599018a7 LR |
498 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
499 | net_ieee802154_lowpan(net); | |
7240cdec AA |
500 | |
501 | table = lowpan_frags_ns_ctl_table; | |
502 | if (!net_eq(net, &init_net)) { | |
503 | table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table), | |
504 | GFP_KERNEL); | |
505 | if (table == NULL) | |
506 | goto err_alloc; | |
507 | ||
599018a7 | 508 | table[0].data = &ieee802154_lowpan->frags.high_thresh; |
1bab4c75 NA |
509 | table[0].extra1 = &ieee802154_lowpan->frags.low_thresh; |
510 | table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh; | |
599018a7 | 511 | table[1].data = &ieee802154_lowpan->frags.low_thresh; |
1bab4c75 | 512 | table[1].extra2 = &ieee802154_lowpan->frags.high_thresh; |
599018a7 | 513 | table[2].data = &ieee802154_lowpan->frags.timeout; |
7240cdec AA |
514 | |
515 | /* Don't export sysctls to unprivileged users */ | |
516 | if (net->user_ns != &init_user_ns) | |
517 | table[0].procname = NULL; | |
518 | } | |
519 | ||
520 | hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table); | |
521 | if (hdr == NULL) | |
522 | goto err_reg; | |
523 | ||
599018a7 | 524 | ieee802154_lowpan->sysctl.frags_hdr = hdr; |
7240cdec AA |
525 | return 0; |
526 | ||
527 | err_reg: | |
528 | if (!net_eq(net, &init_net)) | |
529 | kfree(table); | |
530 | err_alloc: | |
531 | return -ENOMEM; | |
532 | } | |
533 | ||
534 | static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net) | |
535 | { | |
536 | struct ctl_table *table; | |
599018a7 LR |
537 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
538 | net_ieee802154_lowpan(net); | |
7240cdec | 539 | |
599018a7 LR |
540 | table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg; |
541 | unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr); | |
7240cdec AA |
542 | if (!net_eq(net, &init_net)) |
543 | kfree(table); | |
544 | } | |
545 | ||
546 | static struct ctl_table_header *lowpan_ctl_header; | |
547 | ||
3243acd3 | 548 | static int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
549 | { |
550 | lowpan_ctl_header = register_net_sysctl(&init_net, | |
551 | "net/ieee802154/6lowpan", | |
552 | lowpan_frags_ctl_table); | |
553 | return lowpan_ctl_header == NULL ? -ENOMEM : 0; | |
554 | } | |
555 | ||
556 | static void lowpan_frags_sysctl_unregister(void) | |
557 | { | |
558 | unregister_net_sysctl_table(lowpan_ctl_header); | |
559 | } | |
560 | #else | |
f0a0c1ce | 561 | static inline int lowpan_frags_ns_sysctl_register(struct net *net) |
7240cdec AA |
562 | { |
563 | return 0; | |
564 | } | |
565 | ||
566 | static inline void lowpan_frags_ns_sysctl_unregister(struct net *net) | |
567 | { | |
568 | } | |
569 | ||
f0a0c1ce | 570 | static inline int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
571 | { |
572 | return 0; | |
573 | } | |
574 | ||
575 | static inline void lowpan_frags_sysctl_unregister(void) | |
576 | { | |
577 | } | |
578 | #endif | |
579 | ||
580 | static int __net_init lowpan_frags_init_net(struct net *net) | |
581 | { | |
599018a7 LR |
582 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
583 | net_ieee802154_lowpan(net); | |
7240cdec | 584 | |
599018a7 LR |
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; | |
599018a7 | 588 | |
5a63643e JDB |
589 | inet_frags_init_net(&ieee802154_lowpan->frags); |
590 | ||
591 | return lowpan_frags_ns_sysctl_register(net); | |
7240cdec AA |
592 | } |
593 | ||
594 | static void __net_exit lowpan_frags_exit_net(struct net *net) | |
595 | { | |
599018a7 LR |
596 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
597 | net_ieee802154_lowpan(net); | |
598 | ||
7240cdec | 599 | lowpan_frags_ns_sysctl_unregister(net); |
599018a7 | 600 | inet_frags_exit_net(&ieee802154_lowpan->frags, &lowpan_frags); |
7240cdec AA |
601 | } |
602 | ||
603 | static struct pernet_operations lowpan_frags_ops = { | |
604 | .init = lowpan_frags_init_net, | |
605 | .exit = lowpan_frags_exit_net, | |
606 | }; | |
607 | ||
608 | int __init lowpan_net_frag_init(void) | |
609 | { | |
610 | int ret; | |
611 | ||
612 | ret = lowpan_frags_sysctl_register(); | |
613 | if (ret) | |
37147652 | 614 | return ret; |
7240cdec AA |
615 | |
616 | ret = register_pernet_subsys(&lowpan_frags_ops); | |
617 | if (ret) | |
618 | goto err_pernet; | |
619 | ||
620 | lowpan_frags.hashfn = lowpan_hashfn; | |
621 | lowpan_frags.constructor = lowpan_frag_init; | |
622 | lowpan_frags.destructor = NULL; | |
7240cdec AA |
623 | lowpan_frags.qsize = sizeof(struct frag_queue); |
624 | lowpan_frags.match = lowpan_frag_match; | |
625 | lowpan_frags.frag_expire = lowpan_frag_expire; | |
d4ad4d22 NA |
626 | lowpan_frags.frags_cache_name = lowpan_frags_cache_name; |
627 | ret = inet_frags_init(&lowpan_frags); | |
628 | if (ret) | |
629 | goto err_pernet; | |
37147652 AA |
630 | |
631 | return ret; | |
7240cdec AA |
632 | err_pernet: |
633 | lowpan_frags_sysctl_unregister(); | |
7240cdec AA |
634 | return ret; |
635 | } | |
636 | ||
637 | void lowpan_net_frag_exit(void) | |
638 | { | |
639 | inet_frags_fini(&lowpan_frags); | |
640 | lowpan_frags_sysctl_unregister(); | |
641 | unregister_pernet_subsys(&lowpan_frags_ops); | |
642 | } |