Commit | Line | Data |
---|---|---|
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> |
70b095c8 | 28 | #include <net/ipv6_frag.h> |
7240cdec AA |
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 | |
36c77782 | 40 | static void lowpan_frag_init(struct inet_frag_queue *q, const void *a) |
7240cdec | 41 | { |
648700f7 | 42 | const struct frag_lowpan_compare_key *key = a; |
7240cdec | 43 | |
648700f7 ED |
44 | BUILD_BUG_ON(sizeof(*key) > sizeof(q->key)); |
45 | memcpy(&q->key, key, sizeof(*key)); | |
7240cdec | 46 | } |
7240cdec | 47 | |
78802011 | 48 | static void lowpan_frag_expire(struct timer_list *t) |
7240cdec | 49 | { |
78802011 | 50 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
7240cdec | 51 | struct frag_queue *fq; |
7240cdec | 52 | |
78802011 | 53 | fq = container_of(frag, struct frag_queue, q); |
7240cdec | 54 | |
17794326 FW |
55 | spin_lock(&fq->q.lock); |
56 | ||
06aa8b8a | 57 | if (fq->q.flags & INET_FRAG_COMPLETE) |
17794326 FW |
58 | goto out; |
59 | ||
093ba729 | 60 | inet_frag_kill(&fq->q); |
17794326 FW |
61 | out: |
62 | spin_unlock(&fq->q.lock); | |
093ba729 | 63 | inet_frag_put(&fq->q); |
7240cdec AA |
64 | } |
65 | ||
66 | static inline struct lowpan_frag_queue * | |
72a5e6bb | 67 | fq_find(struct net *net, const struct lowpan_802154_cb *cb, |
ae531b94 PB |
68 | const struct ieee802154_addr *src, |
69 | const struct ieee802154_addr *dst) | |
7240cdec | 70 | { |
599018a7 LR |
71 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
72 | net_ieee802154_lowpan(net); | |
f18fa5de | 73 | struct frag_lowpan_compare_key key = {}; |
648700f7 | 74 | struct inet_frag_queue *q; |
7240cdec | 75 | |
f18fa5de AA |
76 | key.tag = cb->d_tag; |
77 | key.d_size = cb->d_size; | |
78 | key.src = *src; | |
79 | key.dst = *dst; | |
80 | ||
648700f7 | 81 | q = inet_frag_find(&ieee802154_lowpan->frags, &key); |
2d44ed22 | 82 | if (!q) |
7240cdec | 83 | return NULL; |
2d44ed22 | 84 | |
7240cdec AA |
85 | return container_of(q, struct lowpan_frag_queue, q); |
86 | } | |
87 | ||
88 | static int lowpan_frag_queue(struct lowpan_frag_queue *fq, | |
72a5e6bb | 89 | struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
90 | { |
91 | struct sk_buff *prev, *next; | |
f4606583 | 92 | struct net_device *ldev; |
7240cdec AA |
93 | int end, offset; |
94 | ||
06aa8b8a | 95 | if (fq->q.flags & INET_FRAG_COMPLETE) |
7240cdec AA |
96 | goto err; |
97 | ||
72a5e6bb AA |
98 | offset = lowpan_802154_cb(skb)->d_offset << 3; |
99 | end = lowpan_802154_cb(skb)->d_size; | |
7240cdec AA |
100 | |
101 | /* Is this the final fragment? */ | |
102 | if (offset + skb->len == end) { | |
103 | /* If we already have some bits beyond end | |
104 | * or have different end, the segment is corrupted. | |
105 | */ | |
106 | if (end < fq->q.len || | |
06aa8b8a | 107 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
7240cdec | 108 | goto err; |
06aa8b8a | 109 | fq->q.flags |= INET_FRAG_LAST_IN; |
7240cdec AA |
110 | fq->q.len = end; |
111 | } else { | |
112 | if (end > fq->q.len) { | |
113 | /* Some bits beyond end -> corruption. */ | |
06aa8b8a | 114 | if (fq->q.flags & INET_FRAG_LAST_IN) |
7240cdec AA |
115 | goto err; |
116 | fq->q.len = end; | |
117 | } | |
118 | } | |
119 | ||
120 | /* Find out which fragments are in front and at the back of us | |
121 | * in the chain of fragments so far. We must know where to put | |
122 | * this fragment, right? | |
123 | */ | |
124 | prev = fq->q.fragments_tail; | |
72a5e6bb AA |
125 | if (!prev || |
126 | lowpan_802154_cb(prev)->d_offset < | |
127 | lowpan_802154_cb(skb)->d_offset) { | |
7240cdec AA |
128 | next = NULL; |
129 | goto found; | |
130 | } | |
131 | prev = NULL; | |
132 | for (next = fq->q.fragments; next != NULL; next = next->next) { | |
72a5e6bb AA |
133 | if (lowpan_802154_cb(next)->d_offset >= |
134 | lowpan_802154_cb(skb)->d_offset) | |
7240cdec AA |
135 | break; /* bingo! */ |
136 | prev = next; | |
137 | } | |
138 | ||
139 | found: | |
140 | /* Insert this fragment in the chain of fragments. */ | |
141 | skb->next = next; | |
142 | if (!next) | |
143 | fq->q.fragments_tail = skb; | |
144 | if (prev) | |
145 | prev->next = skb; | |
146 | else | |
147 | fq->q.fragments = skb; | |
148 | ||
f4606583 AA |
149 | ldev = skb->dev; |
150 | if (ldev) | |
7240cdec AA |
151 | skb->dev = NULL; |
152 | ||
153 | fq->q.stamp = skb->tstamp; | |
72a5e6bb | 154 | if (frag_type == LOWPAN_DISPATCH_FRAG1) |
06aa8b8a | 155 | fq->q.flags |= INET_FRAG_FIRST_IN; |
72a5e6bb AA |
156 | |
157 | fq->q.meat += skb->len; | |
0e60d245 | 158 | add_frag_mem_limit(fq->q.net, skb->truesize); |
7240cdec | 159 | |
06aa8b8a | 160 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
7240cdec AA |
161 | fq->q.meat == fq->q.len) { |
162 | int res; | |
163 | unsigned long orefdst = skb->_skb_refdst; | |
164 | ||
165 | skb->_skb_refdst = 0UL; | |
f4606583 | 166 | res = lowpan_frag_reasm(fq, prev, ldev); |
7240cdec AA |
167 | skb->_skb_refdst = orefdst; |
168 | return res; | |
169 | } | |
170 | ||
7240cdec AA |
171 | return -1; |
172 | err: | |
173 | kfree_skb(skb); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | /* Check if this packet is complete. | |
178 | * Returns NULL on failure by any reason, and pointer | |
179 | * to current nexthdr field in reassembled frame. | |
180 | * | |
181 | * It is called with locked fq, and caller must check that | |
182 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
183 | * the last and the first frames arrived and all the bits are here. | |
184 | */ | |
185 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev, | |
f4606583 | 186 | struct net_device *ldev) |
7240cdec AA |
187 | { |
188 | struct sk_buff *fp, *head = fq->q.fragments; | |
189 | int sum_truesize; | |
190 | ||
093ba729 | 191 | inet_frag_kill(&fq->q); |
7240cdec AA |
192 | |
193 | /* Make the one we just received the head. */ | |
194 | if (prev) { | |
195 | head = prev->next; | |
196 | fp = skb_clone(head, GFP_ATOMIC); | |
197 | ||
198 | if (!fp) | |
199 | goto out_oom; | |
200 | ||
201 | fp->next = head->next; | |
202 | if (!fp->next) | |
203 | fq->q.fragments_tail = fp; | |
204 | prev->next = fp; | |
205 | ||
206 | skb_morph(head, fq->q.fragments); | |
207 | head->next = fq->q.fragments->next; | |
208 | ||
209 | consume_skb(fq->q.fragments); | |
210 | fq->q.fragments = head; | |
211 | } | |
212 | ||
213 | /* Head of list must not be cloned. */ | |
214 | if (skb_unclone(head, GFP_ATOMIC)) | |
215 | goto out_oom; | |
216 | ||
217 | /* If the first fragment is fragmented itself, we split | |
218 | * it to two chunks: the first with data and paged part | |
219 | * and the second, holding only fragments. | |
220 | */ | |
221 | if (skb_has_frag_list(head)) { | |
222 | struct sk_buff *clone; | |
223 | int i, plen = 0; | |
224 | ||
225 | clone = alloc_skb(0, GFP_ATOMIC); | |
226 | if (!clone) | |
227 | goto out_oom; | |
228 | clone->next = head->next; | |
229 | head->next = clone; | |
230 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; | |
231 | skb_frag_list_init(head); | |
232 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) | |
233 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); | |
234 | clone->len = head->data_len - plen; | |
235 | clone->data_len = clone->len; | |
236 | head->data_len -= clone->len; | |
237 | head->len -= clone->len; | |
0e60d245 | 238 | add_frag_mem_limit(fq->q.net, clone->truesize); |
7240cdec AA |
239 | } |
240 | ||
241 | WARN_ON(head == NULL); | |
242 | ||
243 | sum_truesize = head->truesize; | |
244 | for (fp = head->next; fp;) { | |
245 | bool headstolen; | |
246 | int delta; | |
247 | struct sk_buff *next = fp->next; | |
248 | ||
249 | sum_truesize += fp->truesize; | |
250 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { | |
251 | kfree_skb_partial(fp, headstolen); | |
252 | } else { | |
253 | if (!skb_shinfo(head)->frag_list) | |
254 | skb_shinfo(head)->frag_list = fp; | |
255 | head->data_len += fp->len; | |
256 | head->len += fp->len; | |
257 | head->truesize += fp->truesize; | |
258 | } | |
259 | fp = next; | |
260 | } | |
0e60d245 | 261 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
7240cdec AA |
262 | |
263 | head->next = NULL; | |
f4606583 | 264 | head->dev = ldev; |
7240cdec AA |
265 | head->tstamp = fq->q.stamp; |
266 | ||
267 | fq->q.fragments = NULL; | |
268 | fq->q.fragments_tail = NULL; | |
269 | ||
270 | return 1; | |
271 | out_oom: | |
272 | net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n"); | |
273 | return -1; | |
274 | } | |
275 | ||
72a5e6bb AA |
276 | static int lowpan_frag_rx_handlers_result(struct sk_buff *skb, |
277 | lowpan_rx_result res) | |
278 | { | |
279 | switch (res) { | |
280 | case RX_QUEUED: | |
281 | return NET_RX_SUCCESS; | |
282 | case RX_CONTINUE: | |
283 | /* nobody cared about this packet */ | |
284 | net_warn_ratelimited("%s: received unknown dispatch\n", | |
285 | __func__); | |
286 | ||
287 | /* fall-through */ | |
288 | default: | |
289 | /* all others failure */ | |
290 | return NET_RX_DROP; | |
291 | } | |
292 | } | |
293 | ||
294 | static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb) | |
295 | { | |
296 | int ret; | |
297 | ||
298 | if (!lowpan_is_iphc(*skb_network_header(skb))) | |
299 | return RX_CONTINUE; | |
300 | ||
301 | ret = lowpan_iphc_decompress(skb); | |
302 | if (ret < 0) | |
303 | return RX_DROP; | |
304 | ||
305 | return RX_QUEUED; | |
306 | } | |
307 | ||
308 | static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb) | |
309 | { | |
310 | lowpan_rx_result res; | |
311 | ||
312 | #define CALL_RXH(rxh) \ | |
313 | do { \ | |
314 | res = rxh(skb); \ | |
315 | if (res != RX_CONTINUE) \ | |
316 | goto rxh_next; \ | |
317 | } while (0) | |
318 | ||
319 | /* likely at first */ | |
320 | CALL_RXH(lowpan_frag_rx_h_iphc); | |
321 | CALL_RXH(lowpan_rx_h_ipv6); | |
322 | ||
323 | rxh_next: | |
324 | return lowpan_frag_rx_handlers_result(skb, res); | |
325 | #undef CALL_RXH | |
326 | } | |
327 | ||
328 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07 | |
329 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8 | |
330 | ||
331 | static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type, | |
332 | struct lowpan_802154_cb *cb) | |
7240cdec AA |
333 | { |
334 | bool fail; | |
72a5e6bb | 335 | u8 high = 0, low = 0; |
f870b8c6 | 336 | __be16 d_tag = 0; |
7240cdec | 337 | |
72a5e6bb | 338 | fail = lowpan_fetch_skb(skb, &high, 1); |
7240cdec | 339 | fail |= lowpan_fetch_skb(skb, &low, 1); |
72a5e6bb AA |
340 | /* remove the dispatch value and use first three bits as high value |
341 | * for the datagram size | |
342 | */ | |
343 | cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) << | |
344 | LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low; | |
f870b8c6 | 345 | fail |= lowpan_fetch_skb(skb, &d_tag, 2); |
72a5e6bb | 346 | cb->d_tag = ntohs(d_tag); |
7240cdec AA |
347 | |
348 | if (frag_type == LOWPAN_DISPATCH_FRAGN) { | |
72a5e6bb | 349 | fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1); |
7240cdec AA |
350 | } else { |
351 | skb_reset_network_header(skb); | |
72a5e6bb AA |
352 | cb->d_offset = 0; |
353 | /* check if datagram_size has ipv6hdr on FRAG1 */ | |
354 | fail |= cb->d_size < sizeof(struct ipv6hdr); | |
355 | /* check if we can dereference the dispatch value */ | |
356 | fail |= !skb->len; | |
7240cdec AA |
357 | } |
358 | ||
359 | if (unlikely(fail)) | |
360 | return -EIO; | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
72a5e6bb | 365 | int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
366 | { |
367 | struct lowpan_frag_queue *fq; | |
368 | struct net *net = dev_net(skb->dev); | |
72a5e6bb | 369 | struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); |
f18fa5de | 370 | struct ieee802154_hdr hdr = {}; |
7240cdec AA |
371 | int err; |
372 | ||
72a5e6bb AA |
373 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
374 | goto err; | |
ae531b94 | 375 | |
72a5e6bb | 376 | err = lowpan_get_cb(skb, frag_type, cb); |
7240cdec AA |
377 | if (err < 0) |
378 | goto err; | |
379 | ||
72a5e6bb AA |
380 | if (frag_type == LOWPAN_DISPATCH_FRAG1) { |
381 | err = lowpan_invoke_frag_rx_handlers(skb); | |
382 | if (err == NET_RX_DROP) | |
383 | goto err; | |
384 | } | |
385 | ||
386 | if (cb->d_size > IPV6_MIN_MTU) { | |
6697dabe | 387 | net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n"); |
7240cdec | 388 | goto err; |
6697dabe | 389 | } |
7240cdec | 390 | |
72a5e6bb | 391 | fq = fq_find(net, cb, &hdr.source, &hdr.dest); |
7240cdec AA |
392 | if (fq != NULL) { |
393 | int ret; | |
4710d806 | 394 | |
7240cdec AA |
395 | spin_lock(&fq->q.lock); |
396 | ret = lowpan_frag_queue(fq, skb, frag_type); | |
397 | spin_unlock(&fq->q.lock); | |
398 | ||
093ba729 | 399 | inet_frag_put(&fq->q); |
7240cdec AA |
400 | return ret; |
401 | } | |
402 | ||
403 | err: | |
404 | kfree_skb(skb); | |
405 | return -1; | |
406 | } | |
7240cdec AA |
407 | |
408 | #ifdef CONFIG_SYSCTL | |
1bab4c75 | 409 | |
7240cdec AA |
410 | static struct ctl_table lowpan_frags_ns_ctl_table[] = { |
411 | { | |
412 | .procname = "6lowpanfrag_high_thresh", | |
413 | .data = &init_net.ieee802154_lowpan.frags.high_thresh, | |
3e67f106 | 414 | .maxlen = sizeof(unsigned long), |
7240cdec | 415 | .mode = 0644, |
3e67f106 | 416 | .proc_handler = proc_doulongvec_minmax, |
1bab4c75 | 417 | .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh |
7240cdec AA |
418 | }, |
419 | { | |
420 | .procname = "6lowpanfrag_low_thresh", | |
421 | .data = &init_net.ieee802154_lowpan.frags.low_thresh, | |
3e67f106 | 422 | .maxlen = sizeof(unsigned long), |
7240cdec | 423 | .mode = 0644, |
3e67f106 | 424 | .proc_handler = proc_doulongvec_minmax, |
1bab4c75 | 425 | .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh |
7240cdec AA |
426 | }, |
427 | { | |
428 | .procname = "6lowpanfrag_time", | |
429 | .data = &init_net.ieee802154_lowpan.frags.timeout, | |
430 | .maxlen = sizeof(int), | |
431 | .mode = 0644, | |
432 | .proc_handler = proc_dointvec_jiffies, | |
433 | }, | |
7240cdec AA |
434 | { } |
435 | }; | |
436 | ||
e3a57d18 FW |
437 | /* secret interval has been deprecated */ |
438 | static int lowpan_frags_secret_interval_unused; | |
7240cdec AA |
439 | static struct ctl_table lowpan_frags_ctl_table[] = { |
440 | { | |
441 | .procname = "6lowpanfrag_secret_interval", | |
e3a57d18 | 442 | .data = &lowpan_frags_secret_interval_unused, |
7240cdec AA |
443 | .maxlen = sizeof(int), |
444 | .mode = 0644, | |
445 | .proc_handler = proc_dointvec_jiffies, | |
446 | }, | |
447 | { } | |
448 | }; | |
449 | ||
450 | static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) | |
451 | { | |
452 | struct ctl_table *table; | |
453 | struct ctl_table_header *hdr; | |
599018a7 LR |
454 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
455 | net_ieee802154_lowpan(net); | |
7240cdec AA |
456 | |
457 | table = lowpan_frags_ns_ctl_table; | |
458 | if (!net_eq(net, &init_net)) { | |
459 | table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table), | |
460 | GFP_KERNEL); | |
461 | if (table == NULL) | |
462 | goto err_alloc; | |
463 | ||
599018a7 | 464 | table[0].data = &ieee802154_lowpan->frags.high_thresh; |
1bab4c75 NA |
465 | table[0].extra1 = &ieee802154_lowpan->frags.low_thresh; |
466 | table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh; | |
599018a7 | 467 | table[1].data = &ieee802154_lowpan->frags.low_thresh; |
1bab4c75 | 468 | table[1].extra2 = &ieee802154_lowpan->frags.high_thresh; |
599018a7 | 469 | table[2].data = &ieee802154_lowpan->frags.timeout; |
7240cdec AA |
470 | |
471 | /* Don't export sysctls to unprivileged users */ | |
472 | if (net->user_ns != &init_user_ns) | |
473 | table[0].procname = NULL; | |
474 | } | |
475 | ||
476 | hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table); | |
477 | if (hdr == NULL) | |
478 | goto err_reg; | |
479 | ||
599018a7 | 480 | ieee802154_lowpan->sysctl.frags_hdr = hdr; |
7240cdec AA |
481 | return 0; |
482 | ||
483 | err_reg: | |
484 | if (!net_eq(net, &init_net)) | |
485 | kfree(table); | |
486 | err_alloc: | |
487 | return -ENOMEM; | |
488 | } | |
489 | ||
490 | static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net) | |
491 | { | |
492 | struct ctl_table *table; | |
599018a7 LR |
493 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
494 | net_ieee802154_lowpan(net); | |
7240cdec | 495 | |
599018a7 LR |
496 | table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg; |
497 | unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr); | |
7240cdec AA |
498 | if (!net_eq(net, &init_net)) |
499 | kfree(table); | |
500 | } | |
501 | ||
502 | static struct ctl_table_header *lowpan_ctl_header; | |
503 | ||
3243acd3 | 504 | static int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
505 | { |
506 | lowpan_ctl_header = register_net_sysctl(&init_net, | |
507 | "net/ieee802154/6lowpan", | |
508 | lowpan_frags_ctl_table); | |
509 | return lowpan_ctl_header == NULL ? -ENOMEM : 0; | |
510 | } | |
511 | ||
512 | static void lowpan_frags_sysctl_unregister(void) | |
513 | { | |
514 | unregister_net_sysctl_table(lowpan_ctl_header); | |
515 | } | |
516 | #else | |
f0a0c1ce | 517 | static inline int lowpan_frags_ns_sysctl_register(struct net *net) |
7240cdec AA |
518 | { |
519 | return 0; | |
520 | } | |
521 | ||
522 | static inline void lowpan_frags_ns_sysctl_unregister(struct net *net) | |
523 | { | |
524 | } | |
525 | ||
f0a0c1ce | 526 | static inline int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
527 | { |
528 | return 0; | |
529 | } | |
530 | ||
531 | static inline void lowpan_frags_sysctl_unregister(void) | |
532 | { | |
533 | } | |
534 | #endif | |
535 | ||
536 | static int __net_init lowpan_frags_init_net(struct net *net) | |
537 | { | |
599018a7 LR |
538 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
539 | net_ieee802154_lowpan(net); | |
787bea77 | 540 | int res; |
7240cdec | 541 | |
599018a7 LR |
542 | ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
543 | ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH; | |
544 | ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT; | |
093ba729 | 545 | ieee802154_lowpan->frags.f = &lowpan_frags; |
599018a7 | 546 | |
787bea77 ED |
547 | res = inet_frags_init_net(&ieee802154_lowpan->frags); |
548 | if (res < 0) | |
549 | return res; | |
550 | res = lowpan_frags_ns_sysctl_register(net); | |
551 | if (res < 0) | |
093ba729 | 552 | inet_frags_exit_net(&ieee802154_lowpan->frags); |
787bea77 | 553 | return res; |
7240cdec AA |
554 | } |
555 | ||
556 | static void __net_exit lowpan_frags_exit_net(struct net *net) | |
557 | { | |
599018a7 LR |
558 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
559 | net_ieee802154_lowpan(net); | |
560 | ||
7240cdec | 561 | lowpan_frags_ns_sysctl_unregister(net); |
093ba729 | 562 | inet_frags_exit_net(&ieee802154_lowpan->frags); |
7240cdec AA |
563 | } |
564 | ||
565 | static struct pernet_operations lowpan_frags_ops = { | |
566 | .init = lowpan_frags_init_net, | |
567 | .exit = lowpan_frags_exit_net, | |
568 | }; | |
569 | ||
648700f7 ED |
570 | static u32 lowpan_key_hashfn(const void *data, u32 len, u32 seed) |
571 | { | |
572 | return jhash2(data, | |
573 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
574 | } | |
575 | ||
576 | static u32 lowpan_obj_hashfn(const void *data, u32 len, u32 seed) | |
577 | { | |
578 | const struct inet_frag_queue *fq = data; | |
579 | ||
580 | return jhash2((const u32 *)&fq->key, | |
581 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
582 | } | |
583 | ||
584 | static int lowpan_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) | |
585 | { | |
586 | const struct frag_lowpan_compare_key *key = arg->key; | |
587 | const struct inet_frag_queue *fq = ptr; | |
588 | ||
589 | return !!memcmp(&fq->key, key, sizeof(*key)); | |
590 | } | |
591 | ||
592 | static const struct rhashtable_params lowpan_rhash_params = { | |
593 | .head_offset = offsetof(struct inet_frag_queue, node), | |
594 | .hashfn = lowpan_key_hashfn, | |
595 | .obj_hashfn = lowpan_obj_hashfn, | |
596 | .obj_cmpfn = lowpan_obj_cmpfn, | |
597 | .automatic_shrinking = true, | |
598 | }; | |
599 | ||
7240cdec AA |
600 | int __init lowpan_net_frag_init(void) |
601 | { | |
602 | int ret; | |
603 | ||
7240cdec AA |
604 | lowpan_frags.constructor = lowpan_frag_init; |
605 | lowpan_frags.destructor = NULL; | |
7240cdec | 606 | lowpan_frags.qsize = sizeof(struct frag_queue); |
7240cdec | 607 | lowpan_frags.frag_expire = lowpan_frag_expire; |
d4ad4d22 | 608 | lowpan_frags.frags_cache_name = lowpan_frags_cache_name; |
648700f7 | 609 | lowpan_frags.rhash_params = lowpan_rhash_params; |
d4ad4d22 NA |
610 | ret = inet_frags_init(&lowpan_frags); |
611 | if (ret) | |
807f1844 | 612 | goto out; |
37147652 | 613 | |
807f1844 ED |
614 | ret = lowpan_frags_sysctl_register(); |
615 | if (ret) | |
616 | goto err_sysctl; | |
617 | ||
618 | ret = register_pernet_subsys(&lowpan_frags_ops); | |
619 | if (ret) | |
620 | goto err_pernet; | |
621 | out: | |
37147652 | 622 | return ret; |
7240cdec AA |
623 | err_pernet: |
624 | lowpan_frags_sysctl_unregister(); | |
807f1844 ED |
625 | err_sysctl: |
626 | inet_frags_fini(&lowpan_frags); | |
7240cdec AA |
627 | return ret; |
628 | } | |
629 | ||
630 | void lowpan_net_frag_exit(void) | |
631 | { | |
632 | inet_frags_fini(&lowpan_frags); | |
633 | lowpan_frags_sysctl_unregister(); | |
634 | unregister_pernet_subsys(&lowpan_frags_ops); | |
635 | } |