]>
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> |
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 | |
36c77782 | 40 | static void lowpan_frag_init(struct inet_frag_queue *q, const void *a) |
7240cdec | 41 | { |
4e722036 | 42 | const struct frag_lowpan_compare_key *key = a; |
7240cdec | 43 | struct lowpan_frag_queue *fq; |
7240cdec AA |
44 | |
45 | fq = container_of(q, struct lowpan_frag_queue, q); | |
46 | ||
4e722036 ED |
47 | BUILD_BUG_ON(sizeof(*key) > sizeof(q->key)); |
48 | memcpy(&q->key, key, sizeof(*key)); | |
7240cdec | 49 | } |
7240cdec | 50 | |
78802011 | 51 | static void lowpan_frag_expire(struct timer_list *t) |
7240cdec | 52 | { |
78802011 | 53 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
7240cdec AA |
54 | struct frag_queue *fq; |
55 | struct net *net; | |
56 | ||
78802011 | 57 | fq = container_of(frag, struct frag_queue, q); |
7240cdec AA |
58 | net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags); |
59 | ||
17794326 FW |
60 | spin_lock(&fq->q.lock); |
61 | ||
06aa8b8a | 62 | if (fq->q.flags & INET_FRAG_COMPLETE) |
17794326 FW |
63 | goto out; |
64 | ||
9bdf9ca9 | 65 | inet_frag_kill(&fq->q); |
17794326 FW |
66 | out: |
67 | spin_unlock(&fq->q.lock); | |
9bdf9ca9 | 68 | inet_frag_put(&fq->q); |
7240cdec AA |
69 | } |
70 | ||
71 | static inline struct lowpan_frag_queue * | |
72a5e6bb | 72 | fq_find(struct net *net, const struct lowpan_802154_cb *cb, |
ae531b94 PB |
73 | const struct ieee802154_addr *src, |
74 | const struct ieee802154_addr *dst) | |
7240cdec | 75 | { |
599018a7 LR |
76 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
77 | net_ieee802154_lowpan(net); | |
4e722036 ED |
78 | struct frag_lowpan_compare_key key = { |
79 | .tag = cb->d_tag, | |
80 | .d_size = cb->d_size, | |
81 | .src = *src, | |
82 | .dst = *dst, | |
83 | }; | |
84 | struct inet_frag_queue *q; | |
7240cdec | 85 | |
4e722036 | 86 | q = inet_frag_find(&ieee802154_lowpan->frags, &key); |
7240cdec AA |
87 | if (IS_ERR_OR_NULL(q)) { |
88 | inet_frag_maybe_warn_overflow(q, pr_fmt()); | |
89 | return NULL; | |
90 | } | |
91 | return container_of(q, struct lowpan_frag_queue, q); | |
92 | } | |
93 | ||
94 | static int lowpan_frag_queue(struct lowpan_frag_queue *fq, | |
72a5e6bb | 95 | struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
96 | { |
97 | struct sk_buff *prev, *next; | |
f4606583 | 98 | struct net_device *ldev; |
7240cdec AA |
99 | int end, offset; |
100 | ||
06aa8b8a | 101 | if (fq->q.flags & INET_FRAG_COMPLETE) |
7240cdec AA |
102 | goto err; |
103 | ||
72a5e6bb AA |
104 | offset = lowpan_802154_cb(skb)->d_offset << 3; |
105 | end = lowpan_802154_cb(skb)->d_size; | |
7240cdec AA |
106 | |
107 | /* Is this the final fragment? */ | |
108 | if (offset + skb->len == end) { | |
109 | /* If we already have some bits beyond end | |
110 | * or have different end, the segment is corrupted. | |
111 | */ | |
112 | if (end < fq->q.len || | |
06aa8b8a | 113 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
7240cdec | 114 | goto err; |
06aa8b8a | 115 | fq->q.flags |= INET_FRAG_LAST_IN; |
7240cdec AA |
116 | fq->q.len = end; |
117 | } else { | |
118 | if (end > fq->q.len) { | |
119 | /* Some bits beyond end -> corruption. */ | |
06aa8b8a | 120 | if (fq->q.flags & INET_FRAG_LAST_IN) |
7240cdec AA |
121 | goto err; |
122 | fq->q.len = end; | |
123 | } | |
124 | } | |
125 | ||
126 | /* Find out which fragments are in front and at the back of us | |
127 | * in the chain of fragments so far. We must know where to put | |
128 | * this fragment, right? | |
129 | */ | |
130 | prev = fq->q.fragments_tail; | |
72a5e6bb AA |
131 | if (!prev || |
132 | lowpan_802154_cb(prev)->d_offset < | |
133 | lowpan_802154_cb(skb)->d_offset) { | |
7240cdec AA |
134 | next = NULL; |
135 | goto found; | |
136 | } | |
137 | prev = NULL; | |
138 | for (next = fq->q.fragments; next != NULL; next = next->next) { | |
72a5e6bb AA |
139 | if (lowpan_802154_cb(next)->d_offset >= |
140 | lowpan_802154_cb(skb)->d_offset) | |
7240cdec AA |
141 | break; /* bingo! */ |
142 | prev = next; | |
143 | } | |
144 | ||
145 | found: | |
146 | /* Insert this fragment in the chain of fragments. */ | |
147 | skb->next = next; | |
148 | if (!next) | |
149 | fq->q.fragments_tail = skb; | |
150 | if (prev) | |
151 | prev->next = skb; | |
152 | else | |
153 | fq->q.fragments = skb; | |
154 | ||
f4606583 AA |
155 | ldev = skb->dev; |
156 | if (ldev) | |
7240cdec AA |
157 | skb->dev = NULL; |
158 | ||
159 | fq->q.stamp = skb->tstamp; | |
72a5e6bb | 160 | if (frag_type == LOWPAN_DISPATCH_FRAG1) |
06aa8b8a | 161 | fq->q.flags |= INET_FRAG_FIRST_IN; |
72a5e6bb AA |
162 | |
163 | fq->q.meat += skb->len; | |
0e60d245 | 164 | add_frag_mem_limit(fq->q.net, skb->truesize); |
7240cdec | 165 | |
06aa8b8a | 166 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
7240cdec AA |
167 | fq->q.meat == fq->q.len) { |
168 | int res; | |
169 | unsigned long orefdst = skb->_skb_refdst; | |
170 | ||
171 | skb->_skb_refdst = 0UL; | |
f4606583 | 172 | res = lowpan_frag_reasm(fq, prev, ldev); |
7240cdec AA |
173 | skb->_skb_refdst = orefdst; |
174 | return res; | |
175 | } | |
176 | ||
7240cdec AA |
177 | return -1; |
178 | err: | |
179 | kfree_skb(skb); | |
180 | return -1; | |
181 | } | |
182 | ||
183 | /* Check if this packet is complete. | |
184 | * Returns NULL on failure by any reason, and pointer | |
185 | * to current nexthdr field in reassembled frame. | |
186 | * | |
187 | * It is called with locked fq, and caller must check that | |
188 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
189 | * the last and the first frames arrived and all the bits are here. | |
190 | */ | |
191 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev, | |
f4606583 | 192 | struct net_device *ldev) |
7240cdec AA |
193 | { |
194 | struct sk_buff *fp, *head = fq->q.fragments; | |
195 | int sum_truesize; | |
196 | ||
9bdf9ca9 | 197 | inet_frag_kill(&fq->q); |
7240cdec AA |
198 | |
199 | /* Make the one we just received the head. */ | |
200 | if (prev) { | |
201 | head = prev->next; | |
202 | fp = skb_clone(head, GFP_ATOMIC); | |
203 | ||
204 | if (!fp) | |
205 | goto out_oom; | |
206 | ||
207 | fp->next = head->next; | |
208 | if (!fp->next) | |
209 | fq->q.fragments_tail = fp; | |
210 | prev->next = fp; | |
211 | ||
212 | skb_morph(head, fq->q.fragments); | |
213 | head->next = fq->q.fragments->next; | |
214 | ||
215 | consume_skb(fq->q.fragments); | |
216 | fq->q.fragments = head; | |
217 | } | |
218 | ||
219 | /* Head of list must not be cloned. */ | |
220 | if (skb_unclone(head, GFP_ATOMIC)) | |
221 | goto out_oom; | |
222 | ||
223 | /* If the first fragment is fragmented itself, we split | |
224 | * it to two chunks: the first with data and paged part | |
225 | * and the second, holding only fragments. | |
226 | */ | |
227 | if (skb_has_frag_list(head)) { | |
228 | struct sk_buff *clone; | |
229 | int i, plen = 0; | |
230 | ||
231 | clone = alloc_skb(0, GFP_ATOMIC); | |
232 | if (!clone) | |
233 | goto out_oom; | |
234 | clone->next = head->next; | |
235 | head->next = clone; | |
236 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; | |
237 | skb_frag_list_init(head); | |
238 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) | |
239 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); | |
240 | clone->len = head->data_len - plen; | |
241 | clone->data_len = clone->len; | |
242 | head->data_len -= clone->len; | |
243 | head->len -= clone->len; | |
0e60d245 | 244 | add_frag_mem_limit(fq->q.net, clone->truesize); |
7240cdec AA |
245 | } |
246 | ||
247 | WARN_ON(head == NULL); | |
248 | ||
249 | sum_truesize = head->truesize; | |
250 | for (fp = head->next; fp;) { | |
251 | bool headstolen; | |
252 | int delta; | |
253 | struct sk_buff *next = fp->next; | |
254 | ||
255 | sum_truesize += fp->truesize; | |
256 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { | |
257 | kfree_skb_partial(fp, headstolen); | |
258 | } else { | |
259 | if (!skb_shinfo(head)->frag_list) | |
260 | skb_shinfo(head)->frag_list = fp; | |
261 | head->data_len += fp->len; | |
262 | head->len += fp->len; | |
263 | head->truesize += fp->truesize; | |
264 | } | |
265 | fp = next; | |
266 | } | |
0e60d245 | 267 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
7240cdec AA |
268 | |
269 | head->next = NULL; | |
f4606583 | 270 | head->dev = ldev; |
7240cdec AA |
271 | head->tstamp = fq->q.stamp; |
272 | ||
273 | fq->q.fragments = NULL; | |
274 | fq->q.fragments_tail = NULL; | |
275 | ||
276 | return 1; | |
277 | out_oom: | |
278 | net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n"); | |
279 | return -1; | |
280 | } | |
281 | ||
72a5e6bb AA |
282 | static int lowpan_frag_rx_handlers_result(struct sk_buff *skb, |
283 | lowpan_rx_result res) | |
284 | { | |
285 | switch (res) { | |
286 | case RX_QUEUED: | |
287 | return NET_RX_SUCCESS; | |
288 | case RX_CONTINUE: | |
289 | /* nobody cared about this packet */ | |
290 | net_warn_ratelimited("%s: received unknown dispatch\n", | |
291 | __func__); | |
292 | ||
293 | /* fall-through */ | |
294 | default: | |
295 | /* all others failure */ | |
296 | return NET_RX_DROP; | |
297 | } | |
298 | } | |
299 | ||
300 | static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb) | |
301 | { | |
302 | int ret; | |
303 | ||
304 | if (!lowpan_is_iphc(*skb_network_header(skb))) | |
305 | return RX_CONTINUE; | |
306 | ||
307 | ret = lowpan_iphc_decompress(skb); | |
308 | if (ret < 0) | |
309 | return RX_DROP; | |
310 | ||
311 | return RX_QUEUED; | |
312 | } | |
313 | ||
314 | static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb) | |
315 | { | |
316 | lowpan_rx_result res; | |
317 | ||
318 | #define CALL_RXH(rxh) \ | |
319 | do { \ | |
320 | res = rxh(skb); \ | |
321 | if (res != RX_CONTINUE) \ | |
322 | goto rxh_next; \ | |
323 | } while (0) | |
324 | ||
325 | /* likely at first */ | |
326 | CALL_RXH(lowpan_frag_rx_h_iphc); | |
327 | CALL_RXH(lowpan_rx_h_ipv6); | |
328 | ||
329 | rxh_next: | |
330 | return lowpan_frag_rx_handlers_result(skb, res); | |
331 | #undef CALL_RXH | |
332 | } | |
333 | ||
334 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07 | |
335 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8 | |
336 | ||
337 | static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type, | |
338 | struct lowpan_802154_cb *cb) | |
7240cdec AA |
339 | { |
340 | bool fail; | |
72a5e6bb | 341 | u8 high = 0, low = 0; |
f870b8c6 | 342 | __be16 d_tag = 0; |
7240cdec | 343 | |
72a5e6bb | 344 | fail = lowpan_fetch_skb(skb, &high, 1); |
7240cdec | 345 | fail |= lowpan_fetch_skb(skb, &low, 1); |
72a5e6bb AA |
346 | /* remove the dispatch value and use first three bits as high value |
347 | * for the datagram size | |
348 | */ | |
349 | cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) << | |
350 | LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low; | |
f870b8c6 | 351 | fail |= lowpan_fetch_skb(skb, &d_tag, 2); |
72a5e6bb | 352 | cb->d_tag = ntohs(d_tag); |
7240cdec AA |
353 | |
354 | if (frag_type == LOWPAN_DISPATCH_FRAGN) { | |
72a5e6bb | 355 | fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1); |
7240cdec AA |
356 | } else { |
357 | skb_reset_network_header(skb); | |
72a5e6bb AA |
358 | cb->d_offset = 0; |
359 | /* check if datagram_size has ipv6hdr on FRAG1 */ | |
360 | fail |= cb->d_size < sizeof(struct ipv6hdr); | |
361 | /* check if we can dereference the dispatch value */ | |
362 | fail |= !skb->len; | |
7240cdec AA |
363 | } |
364 | ||
365 | if (unlikely(fail)) | |
366 | return -EIO; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
72a5e6bb | 371 | int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
372 | { |
373 | struct lowpan_frag_queue *fq; | |
374 | struct net *net = dev_net(skb->dev); | |
72a5e6bb AA |
375 | struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); |
376 | struct ieee802154_hdr hdr; | |
7240cdec AA |
377 | int err; |
378 | ||
72a5e6bb AA |
379 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
380 | goto err; | |
ae531b94 | 381 | |
72a5e6bb | 382 | err = lowpan_get_cb(skb, frag_type, cb); |
7240cdec AA |
383 | if (err < 0) |
384 | goto err; | |
385 | ||
72a5e6bb AA |
386 | if (frag_type == LOWPAN_DISPATCH_FRAG1) { |
387 | err = lowpan_invoke_frag_rx_handlers(skb); | |
388 | if (err == NET_RX_DROP) | |
389 | goto err; | |
390 | } | |
391 | ||
392 | if (cb->d_size > IPV6_MIN_MTU) { | |
6697dabe | 393 | net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n"); |
7240cdec | 394 | goto err; |
6697dabe | 395 | } |
7240cdec | 396 | |
72a5e6bb | 397 | fq = fq_find(net, cb, &hdr.source, &hdr.dest); |
7240cdec AA |
398 | if (fq != NULL) { |
399 | int ret; | |
4710d806 | 400 | |
7240cdec AA |
401 | spin_lock(&fq->q.lock); |
402 | ret = lowpan_frag_queue(fq, skb, frag_type); | |
403 | spin_unlock(&fq->q.lock); | |
404 | ||
9bdf9ca9 | 405 | inet_frag_put(&fq->q); |
7240cdec AA |
406 | return ret; |
407 | } | |
408 | ||
409 | err: | |
410 | kfree_skb(skb); | |
411 | return -1; | |
412 | } | |
7240cdec AA |
413 | |
414 | #ifdef CONFIG_SYSCTL | |
1bab4c75 NA |
415 | static int zero; |
416 | ||
7240cdec AA |
417 | static struct ctl_table lowpan_frags_ns_ctl_table[] = { |
418 | { | |
419 | .procname = "6lowpanfrag_high_thresh", | |
420 | .data = &init_net.ieee802154_lowpan.frags.high_thresh, | |
421 | .maxlen = sizeof(int), | |
422 | .mode = 0644, | |
1bab4c75 NA |
423 | .proc_handler = proc_dointvec_minmax, |
424 | .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh | |
7240cdec AA |
425 | }, |
426 | { | |
427 | .procname = "6lowpanfrag_low_thresh", | |
428 | .data = &init_net.ieee802154_lowpan.frags.low_thresh, | |
429 | .maxlen = sizeof(int), | |
430 | .mode = 0644, | |
1bab4c75 NA |
431 | .proc_handler = proc_dointvec_minmax, |
432 | .extra1 = &zero, | |
433 | .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh | |
7240cdec AA |
434 | }, |
435 | { | |
436 | .procname = "6lowpanfrag_time", | |
437 | .data = &init_net.ieee802154_lowpan.frags.timeout, | |
438 | .maxlen = sizeof(int), | |
439 | .mode = 0644, | |
440 | .proc_handler = proc_dointvec_jiffies, | |
441 | }, | |
7240cdec AA |
442 | { } |
443 | }; | |
444 | ||
e3a57d18 FW |
445 | /* secret interval has been deprecated */ |
446 | static int lowpan_frags_secret_interval_unused; | |
7240cdec AA |
447 | static struct ctl_table lowpan_frags_ctl_table[] = { |
448 | { | |
449 | .procname = "6lowpanfrag_secret_interval", | |
e3a57d18 | 450 | .data = &lowpan_frags_secret_interval_unused, |
7240cdec AA |
451 | .maxlen = sizeof(int), |
452 | .mode = 0644, | |
453 | .proc_handler = proc_dointvec_jiffies, | |
454 | }, | |
455 | { } | |
456 | }; | |
457 | ||
458 | static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) | |
459 | { | |
460 | struct ctl_table *table; | |
461 | struct ctl_table_header *hdr; | |
599018a7 LR |
462 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
463 | net_ieee802154_lowpan(net); | |
7240cdec AA |
464 | |
465 | table = lowpan_frags_ns_ctl_table; | |
466 | if (!net_eq(net, &init_net)) { | |
467 | table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table), | |
468 | GFP_KERNEL); | |
469 | if (table == NULL) | |
470 | goto err_alloc; | |
471 | ||
599018a7 | 472 | table[0].data = &ieee802154_lowpan->frags.high_thresh; |
1bab4c75 NA |
473 | table[0].extra1 = &ieee802154_lowpan->frags.low_thresh; |
474 | table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh; | |
599018a7 | 475 | table[1].data = &ieee802154_lowpan->frags.low_thresh; |
1bab4c75 | 476 | table[1].extra2 = &ieee802154_lowpan->frags.high_thresh; |
599018a7 | 477 | table[2].data = &ieee802154_lowpan->frags.timeout; |
7240cdec AA |
478 | |
479 | /* Don't export sysctls to unprivileged users */ | |
480 | if (net->user_ns != &init_user_ns) | |
481 | table[0].procname = NULL; | |
482 | } | |
483 | ||
484 | hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table); | |
485 | if (hdr == NULL) | |
486 | goto err_reg; | |
487 | ||
599018a7 | 488 | ieee802154_lowpan->sysctl.frags_hdr = hdr; |
7240cdec AA |
489 | return 0; |
490 | ||
491 | err_reg: | |
492 | if (!net_eq(net, &init_net)) | |
493 | kfree(table); | |
494 | err_alloc: | |
495 | return -ENOMEM; | |
496 | } | |
497 | ||
498 | static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net) | |
499 | { | |
500 | struct ctl_table *table; | |
599018a7 LR |
501 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
502 | net_ieee802154_lowpan(net); | |
7240cdec | 503 | |
599018a7 LR |
504 | table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg; |
505 | unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr); | |
7240cdec AA |
506 | if (!net_eq(net, &init_net)) |
507 | kfree(table); | |
508 | } | |
509 | ||
510 | static struct ctl_table_header *lowpan_ctl_header; | |
511 | ||
3243acd3 | 512 | static int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
513 | { |
514 | lowpan_ctl_header = register_net_sysctl(&init_net, | |
515 | "net/ieee802154/6lowpan", | |
516 | lowpan_frags_ctl_table); | |
517 | return lowpan_ctl_header == NULL ? -ENOMEM : 0; | |
518 | } | |
519 | ||
520 | static void lowpan_frags_sysctl_unregister(void) | |
521 | { | |
522 | unregister_net_sysctl_table(lowpan_ctl_header); | |
523 | } | |
524 | #else | |
f0a0c1ce | 525 | static inline int lowpan_frags_ns_sysctl_register(struct net *net) |
7240cdec AA |
526 | { |
527 | return 0; | |
528 | } | |
529 | ||
530 | static inline void lowpan_frags_ns_sysctl_unregister(struct net *net) | |
531 | { | |
532 | } | |
533 | ||
f0a0c1ce | 534 | static inline int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
535 | { |
536 | return 0; | |
537 | } | |
538 | ||
539 | static inline void lowpan_frags_sysctl_unregister(void) | |
540 | { | |
541 | } | |
542 | #endif | |
543 | ||
544 | static int __net_init lowpan_frags_init_net(struct net *net) | |
545 | { | |
599018a7 LR |
546 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
547 | net_ieee802154_lowpan(net); | |
1f5c60ac | 548 | int res; |
7240cdec | 549 | |
599018a7 LR |
550 | ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
551 | ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH; | |
552 | ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT; | |
9bdf9ca9 | 553 | ieee802154_lowpan->frags.f = &lowpan_frags; |
599018a7 | 554 | |
1f5c60ac ED |
555 | res = inet_frags_init_net(&ieee802154_lowpan->frags); |
556 | if (res < 0) | |
557 | return res; | |
558 | res = lowpan_frags_ns_sysctl_register(net); | |
559 | if (res < 0) | |
9bdf9ca9 | 560 | inet_frags_exit_net(&ieee802154_lowpan->frags); |
1f5c60ac | 561 | return res; |
7240cdec AA |
562 | } |
563 | ||
564 | static void __net_exit lowpan_frags_exit_net(struct net *net) | |
565 | { | |
599018a7 LR |
566 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
567 | net_ieee802154_lowpan(net); | |
568 | ||
7240cdec | 569 | lowpan_frags_ns_sysctl_unregister(net); |
9bdf9ca9 | 570 | inet_frags_exit_net(&ieee802154_lowpan->frags); |
7240cdec AA |
571 | } |
572 | ||
573 | static struct pernet_operations lowpan_frags_ops = { | |
574 | .init = lowpan_frags_init_net, | |
575 | .exit = lowpan_frags_exit_net, | |
576 | }; | |
577 | ||
4e722036 ED |
578 | static u32 lowpan_key_hashfn(const void *data, u32 len, u32 seed) |
579 | { | |
580 | return jhash2(data, | |
581 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
582 | } | |
583 | ||
584 | static u32 lowpan_obj_hashfn(const void *data, u32 len, u32 seed) | |
585 | { | |
586 | const struct inet_frag_queue *fq = data; | |
587 | ||
588 | return jhash2((const u32 *)&fq->key, | |
589 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
590 | } | |
591 | ||
592 | static int lowpan_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) | |
593 | { | |
594 | const struct frag_lowpan_compare_key *key = arg->key; | |
595 | const struct inet_frag_queue *fq = ptr; | |
596 | ||
597 | return !!memcmp(&fq->key, key, sizeof(*key)); | |
598 | } | |
599 | ||
600 | static const struct rhashtable_params lowpan_rhash_params = { | |
601 | .head_offset = offsetof(struct inet_frag_queue, node), | |
602 | .hashfn = lowpan_key_hashfn, | |
603 | .obj_hashfn = lowpan_obj_hashfn, | |
604 | .obj_cmpfn = lowpan_obj_cmpfn, | |
605 | .automatic_shrinking = true, | |
606 | }; | |
607 | ||
7240cdec AA |
608 | int __init lowpan_net_frag_init(void) |
609 | { | |
610 | int ret; | |
611 | ||
7240cdec AA |
612 | lowpan_frags.constructor = lowpan_frag_init; |
613 | lowpan_frags.destructor = NULL; | |
7240cdec | 614 | lowpan_frags.qsize = sizeof(struct frag_queue); |
7240cdec | 615 | lowpan_frags.frag_expire = lowpan_frag_expire; |
d4ad4d22 | 616 | lowpan_frags.frags_cache_name = lowpan_frags_cache_name; |
4e722036 | 617 | lowpan_frags.rhash_params = lowpan_rhash_params; |
d4ad4d22 NA |
618 | ret = inet_frags_init(&lowpan_frags); |
619 | if (ret) | |
4feacdd6 | 620 | goto out; |
37147652 | 621 | |
4feacdd6 ED |
622 | ret = lowpan_frags_sysctl_register(); |
623 | if (ret) | |
624 | goto err_sysctl; | |
625 | ||
626 | ret = register_pernet_subsys(&lowpan_frags_ops); | |
627 | if (ret) | |
628 | goto err_pernet; | |
629 | out: | |
37147652 | 630 | return ret; |
7240cdec AA |
631 | err_pernet: |
632 | lowpan_frags_sysctl_unregister(); | |
4feacdd6 ED |
633 | err_sysctl: |
634 | inet_frags_fini(&lowpan_frags); | |
7240cdec AA |
635 | return ret; |
636 | } | |
637 | ||
638 | void lowpan_net_frag_exit(void) | |
639 | { | |
640 | inet_frags_fini(&lowpan_frags); | |
641 | lowpan_frags_sysctl_unregister(); | |
642 | unregister_pernet_subsys(&lowpan_frags_ops); | |
643 | } |