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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7240cdec | 2 | /* 6LoWPAN fragment reassembly |
7240cdec AA |
3 | * |
4 | * Authors: | |
5 | * Alexander Aring <aar@pengutronix.de> | |
6 | * | |
7 | * Based on: net/ipv6/reassembly.c | |
7240cdec AA |
8 | */ |
9 | ||
10 | #define pr_fmt(fmt) "6LoWPAN: " fmt | |
11 | ||
12 | #include <linux/net.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/random.h> | |
16 | #include <linux/jhash.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/export.h> | |
20 | ||
21 | #include <net/ieee802154_netdev.h> | |
cefc8c8a | 22 | #include <net/6lowpan.h> |
70b095c8 | 23 | #include <net/ipv6_frag.h> |
7240cdec | 24 | #include <net/inet_frag.h> |
254c5dbe | 25 | #include <net/ip.h> |
7240cdec | 26 | |
8691ee59 | 27 | #include "6lowpan_i.h" |
7240cdec | 28 | |
d4ad4d22 NA |
29 | static const char lowpan_frags_cache_name[] = "lowpan-frags"; |
30 | ||
7240cdec AA |
31 | static struct inet_frags lowpan_frags; |
32 | ||
254c5dbe PO |
33 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb, |
34 | struct sk_buff *prev, struct net_device *ldev); | |
7240cdec | 35 | |
36c77782 | 36 | static void lowpan_frag_init(struct inet_frag_queue *q, const void *a) |
7240cdec | 37 | { |
648700f7 | 38 | const struct frag_lowpan_compare_key *key = a; |
7240cdec | 39 | |
648700f7 ED |
40 | BUILD_BUG_ON(sizeof(*key) > sizeof(q->key)); |
41 | memcpy(&q->key, key, sizeof(*key)); | |
7240cdec | 42 | } |
7240cdec | 43 | |
78802011 | 44 | static void lowpan_frag_expire(struct timer_list *t) |
7240cdec | 45 | { |
78802011 | 46 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
7240cdec | 47 | struct frag_queue *fq; |
7240cdec | 48 | |
78802011 | 49 | fq = container_of(frag, struct frag_queue, q); |
7240cdec | 50 | |
17794326 FW |
51 | spin_lock(&fq->q.lock); |
52 | ||
06aa8b8a | 53 | if (fq->q.flags & INET_FRAG_COMPLETE) |
17794326 FW |
54 | goto out; |
55 | ||
093ba729 | 56 | inet_frag_kill(&fq->q); |
17794326 FW |
57 | out: |
58 | spin_unlock(&fq->q.lock); | |
093ba729 | 59 | inet_frag_put(&fq->q); |
7240cdec AA |
60 | } |
61 | ||
62 | static inline struct lowpan_frag_queue * | |
72a5e6bb | 63 | fq_find(struct net *net, const struct lowpan_802154_cb *cb, |
ae531b94 PB |
64 | const struct ieee802154_addr *src, |
65 | const struct ieee802154_addr *dst) | |
7240cdec | 66 | { |
599018a7 LR |
67 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
68 | net_ieee802154_lowpan(net); | |
f18fa5de | 69 | struct frag_lowpan_compare_key key = {}; |
648700f7 | 70 | struct inet_frag_queue *q; |
7240cdec | 71 | |
f18fa5de AA |
72 | key.tag = cb->d_tag; |
73 | key.d_size = cb->d_size; | |
74 | key.src = *src; | |
75 | key.dst = *dst; | |
76 | ||
4907abc6 | 77 | q = inet_frag_find(ieee802154_lowpan->fqdir, &key); |
2d44ed22 | 78 | if (!q) |
7240cdec | 79 | return NULL; |
2d44ed22 | 80 | |
7240cdec AA |
81 | return container_of(q, struct lowpan_frag_queue, q); |
82 | } | |
83 | ||
84 | static int lowpan_frag_queue(struct lowpan_frag_queue *fq, | |
72a5e6bb | 85 | struct sk_buff *skb, u8 frag_type) |
7240cdec | 86 | { |
254c5dbe | 87 | struct sk_buff *prev_tail; |
f4606583 | 88 | struct net_device *ldev; |
254c5dbe PO |
89 | int end, offset, err; |
90 | ||
91 | /* inet_frag_queue_* functions use skb->cb; see struct ipfrag_skb_cb | |
92 | * in inet_fragment.c | |
93 | */ | |
94 | BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet_skb_parm)); | |
95 | BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet6_skb_parm)); | |
7240cdec | 96 | |
06aa8b8a | 97 | if (fq->q.flags & INET_FRAG_COMPLETE) |
7240cdec AA |
98 | goto err; |
99 | ||
72a5e6bb AA |
100 | offset = lowpan_802154_cb(skb)->d_offset << 3; |
101 | end = lowpan_802154_cb(skb)->d_size; | |
7240cdec AA |
102 | |
103 | /* Is this the final fragment? */ | |
104 | if (offset + skb->len == end) { | |
105 | /* If we already have some bits beyond end | |
106 | * or have different end, the segment is corrupted. | |
107 | */ | |
108 | if (end < fq->q.len || | |
06aa8b8a | 109 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
7240cdec | 110 | goto err; |
06aa8b8a | 111 | fq->q.flags |= INET_FRAG_LAST_IN; |
7240cdec AA |
112 | fq->q.len = end; |
113 | } else { | |
114 | if (end > fq->q.len) { | |
115 | /* Some bits beyond end -> corruption. */ | |
06aa8b8a | 116 | if (fq->q.flags & INET_FRAG_LAST_IN) |
7240cdec AA |
117 | goto err; |
118 | fq->q.len = end; | |
119 | } | |
120 | } | |
121 | ||
f4606583 AA |
122 | ldev = skb->dev; |
123 | if (ldev) | |
7240cdec | 124 | skb->dev = NULL; |
254c5dbe PO |
125 | barrier(); |
126 | ||
127 | prev_tail = fq->q.fragments_tail; | |
128 | err = inet_frag_queue_insert(&fq->q, skb, offset, end); | |
129 | if (err) | |
130 | goto err; | |
7240cdec AA |
131 | |
132 | fq->q.stamp = skb->tstamp; | |
335c8cf3 | 133 | fq->q.mono_delivery_time = skb->mono_delivery_time; |
72a5e6bb | 134 | if (frag_type == LOWPAN_DISPATCH_FRAG1) |
06aa8b8a | 135 | fq->q.flags |= INET_FRAG_FIRST_IN; |
72a5e6bb AA |
136 | |
137 | fq->q.meat += skb->len; | |
6ce3b4dc | 138 | add_frag_mem_limit(fq->q.fqdir, skb->truesize); |
7240cdec | 139 | |
06aa8b8a | 140 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
7240cdec AA |
141 | fq->q.meat == fq->q.len) { |
142 | int res; | |
143 | unsigned long orefdst = skb->_skb_refdst; | |
144 | ||
145 | skb->_skb_refdst = 0UL; | |
254c5dbe | 146 | res = lowpan_frag_reasm(fq, skb, prev_tail, ldev); |
7240cdec AA |
147 | skb->_skb_refdst = orefdst; |
148 | return res; | |
149 | } | |
254c5dbe | 150 | skb_dst_drop(skb); |
7240cdec | 151 | |
7240cdec AA |
152 | return -1; |
153 | err: | |
154 | kfree_skb(skb); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | /* Check if this packet is complete. | |
7240cdec AA |
159 | * |
160 | * It is called with locked fq, and caller must check that | |
161 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
162 | * the last and the first frames arrived and all the bits are here. | |
163 | */ | |
254c5dbe PO |
164 | static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb, |
165 | struct sk_buff *prev_tail, struct net_device *ldev) | |
7240cdec | 166 | { |
254c5dbe | 167 | void *reasm_data; |
7240cdec | 168 | |
093ba729 | 169 | inet_frag_kill(&fq->q); |
7240cdec | 170 | |
254c5dbe PO |
171 | reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail); |
172 | if (!reasm_data) | |
7240cdec | 173 | goto out_oom; |
891584f4 | 174 | inet_frag_reasm_finish(&fq->q, skb, reasm_data, false); |
7240cdec | 175 | |
254c5dbe PO |
176 | skb->dev = ldev; |
177 | skb->tstamp = fq->q.stamp; | |
254c5dbe | 178 | fq->q.rb_fragments = RB_ROOT; |
7240cdec | 179 | fq->q.fragments_tail = NULL; |
254c5dbe | 180 | fq->q.last_run_head = NULL; |
7240cdec AA |
181 | |
182 | return 1; | |
183 | out_oom: | |
184 | net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n"); | |
185 | return -1; | |
186 | } | |
187 | ||
72a5e6bb AA |
188 | static int lowpan_frag_rx_handlers_result(struct sk_buff *skb, |
189 | lowpan_rx_result res) | |
190 | { | |
191 | switch (res) { | |
192 | case RX_QUEUED: | |
193 | return NET_RX_SUCCESS; | |
194 | case RX_CONTINUE: | |
195 | /* nobody cared about this packet */ | |
196 | net_warn_ratelimited("%s: received unknown dispatch\n", | |
197 | __func__); | |
198 | ||
df561f66 | 199 | fallthrough; |
72a5e6bb AA |
200 | default: |
201 | /* all others failure */ | |
202 | return NET_RX_DROP; | |
203 | } | |
204 | } | |
205 | ||
206 | static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | if (!lowpan_is_iphc(*skb_network_header(skb))) | |
211 | return RX_CONTINUE; | |
212 | ||
213 | ret = lowpan_iphc_decompress(skb); | |
214 | if (ret < 0) | |
215 | return RX_DROP; | |
216 | ||
217 | return RX_QUEUED; | |
218 | } | |
219 | ||
220 | static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb) | |
221 | { | |
222 | lowpan_rx_result res; | |
223 | ||
224 | #define CALL_RXH(rxh) \ | |
225 | do { \ | |
226 | res = rxh(skb); \ | |
227 | if (res != RX_CONTINUE) \ | |
228 | goto rxh_next; \ | |
229 | } while (0) | |
230 | ||
231 | /* likely at first */ | |
232 | CALL_RXH(lowpan_frag_rx_h_iphc); | |
233 | CALL_RXH(lowpan_rx_h_ipv6); | |
234 | ||
235 | rxh_next: | |
236 | return lowpan_frag_rx_handlers_result(skb, res); | |
237 | #undef CALL_RXH | |
238 | } | |
239 | ||
240 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07 | |
241 | #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8 | |
242 | ||
243 | static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type, | |
244 | struct lowpan_802154_cb *cb) | |
7240cdec AA |
245 | { |
246 | bool fail; | |
72a5e6bb | 247 | u8 high = 0, low = 0; |
f870b8c6 | 248 | __be16 d_tag = 0; |
7240cdec | 249 | |
72a5e6bb | 250 | fail = lowpan_fetch_skb(skb, &high, 1); |
7240cdec | 251 | fail |= lowpan_fetch_skb(skb, &low, 1); |
72a5e6bb AA |
252 | /* remove the dispatch value and use first three bits as high value |
253 | * for the datagram size | |
254 | */ | |
255 | cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) << | |
256 | LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low; | |
f870b8c6 | 257 | fail |= lowpan_fetch_skb(skb, &d_tag, 2); |
72a5e6bb | 258 | cb->d_tag = ntohs(d_tag); |
7240cdec AA |
259 | |
260 | if (frag_type == LOWPAN_DISPATCH_FRAGN) { | |
72a5e6bb | 261 | fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1); |
7240cdec AA |
262 | } else { |
263 | skb_reset_network_header(skb); | |
72a5e6bb AA |
264 | cb->d_offset = 0; |
265 | /* check if datagram_size has ipv6hdr on FRAG1 */ | |
266 | fail |= cb->d_size < sizeof(struct ipv6hdr); | |
267 | /* check if we can dereference the dispatch value */ | |
268 | fail |= !skb->len; | |
7240cdec AA |
269 | } |
270 | ||
271 | if (unlikely(fail)) | |
272 | return -EIO; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
72a5e6bb | 277 | int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type) |
7240cdec AA |
278 | { |
279 | struct lowpan_frag_queue *fq; | |
280 | struct net *net = dev_net(skb->dev); | |
72a5e6bb | 281 | struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); |
f18fa5de | 282 | struct ieee802154_hdr hdr = {}; |
7240cdec AA |
283 | int err; |
284 | ||
72a5e6bb AA |
285 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
286 | goto err; | |
ae531b94 | 287 | |
72a5e6bb | 288 | err = lowpan_get_cb(skb, frag_type, cb); |
7240cdec AA |
289 | if (err < 0) |
290 | goto err; | |
291 | ||
72a5e6bb AA |
292 | if (frag_type == LOWPAN_DISPATCH_FRAG1) { |
293 | err = lowpan_invoke_frag_rx_handlers(skb); | |
294 | if (err == NET_RX_DROP) | |
295 | goto err; | |
296 | } | |
297 | ||
298 | if (cb->d_size > IPV6_MIN_MTU) { | |
6697dabe | 299 | net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n"); |
7240cdec | 300 | goto err; |
6697dabe | 301 | } |
7240cdec | 302 | |
72a5e6bb | 303 | fq = fq_find(net, cb, &hdr.source, &hdr.dest); |
7240cdec AA |
304 | if (fq != NULL) { |
305 | int ret; | |
4710d806 | 306 | |
7240cdec AA |
307 | spin_lock(&fq->q.lock); |
308 | ret = lowpan_frag_queue(fq, skb, frag_type); | |
309 | spin_unlock(&fq->q.lock); | |
310 | ||
093ba729 | 311 | inet_frag_put(&fq->q); |
7240cdec AA |
312 | return ret; |
313 | } | |
314 | ||
315 | err: | |
316 | kfree_skb(skb); | |
317 | return -1; | |
318 | } | |
7240cdec AA |
319 | |
320 | #ifdef CONFIG_SYSCTL | |
1bab4c75 | 321 | |
7240cdec AA |
322 | static struct ctl_table lowpan_frags_ns_ctl_table[] = { |
323 | { | |
324 | .procname = "6lowpanfrag_high_thresh", | |
3e67f106 | 325 | .maxlen = sizeof(unsigned long), |
7240cdec | 326 | .mode = 0644, |
3e67f106 | 327 | .proc_handler = proc_doulongvec_minmax, |
7240cdec AA |
328 | }, |
329 | { | |
330 | .procname = "6lowpanfrag_low_thresh", | |
3e67f106 | 331 | .maxlen = sizeof(unsigned long), |
7240cdec | 332 | .mode = 0644, |
3e67f106 | 333 | .proc_handler = proc_doulongvec_minmax, |
7240cdec AA |
334 | }, |
335 | { | |
336 | .procname = "6lowpanfrag_time", | |
7240cdec AA |
337 | .maxlen = sizeof(int), |
338 | .mode = 0644, | |
339 | .proc_handler = proc_dointvec_jiffies, | |
340 | }, | |
7240cdec AA |
341 | }; |
342 | ||
e3a57d18 FW |
343 | /* secret interval has been deprecated */ |
344 | static int lowpan_frags_secret_interval_unused; | |
7240cdec AA |
345 | static struct ctl_table lowpan_frags_ctl_table[] = { |
346 | { | |
347 | .procname = "6lowpanfrag_secret_interval", | |
e3a57d18 | 348 | .data = &lowpan_frags_secret_interval_unused, |
7240cdec AA |
349 | .maxlen = sizeof(int), |
350 | .mode = 0644, | |
351 | .proc_handler = proc_dointvec_jiffies, | |
352 | }, | |
7240cdec AA |
353 | }; |
354 | ||
355 | static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) | |
356 | { | |
357 | struct ctl_table *table; | |
358 | struct ctl_table_header *hdr; | |
599018a7 LR |
359 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
360 | net_ieee802154_lowpan(net); | |
c899710f | 361 | size_t table_size = ARRAY_SIZE(lowpan_frags_ns_ctl_table); |
7240cdec AA |
362 | |
363 | table = lowpan_frags_ns_ctl_table; | |
364 | if (!net_eq(net, &init_net)) { | |
365 | table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table), | |
366 | GFP_KERNEL); | |
367 | if (table == NULL) | |
368 | goto err_alloc; | |
369 | ||
7240cdec | 370 | /* Don't export sysctls to unprivileged users */ |
ce218712 | 371 | if (net->user_ns != &init_user_ns) |
c899710f | 372 | table_size = 0; |
7240cdec AA |
373 | } |
374 | ||
4907abc6 ED |
375 | table[0].data = &ieee802154_lowpan->fqdir->high_thresh; |
376 | table[0].extra1 = &ieee802154_lowpan->fqdir->low_thresh; | |
377 | table[1].data = &ieee802154_lowpan->fqdir->low_thresh; | |
378 | table[1].extra2 = &ieee802154_lowpan->fqdir->high_thresh; | |
379 | table[2].data = &ieee802154_lowpan->fqdir->timeout; | |
d2dfd435 | 380 | |
c899710f JG |
381 | hdr = register_net_sysctl_sz(net, "net/ieee802154/6lowpan", table, |
382 | table_size); | |
7240cdec AA |
383 | if (hdr == NULL) |
384 | goto err_reg; | |
385 | ||
599018a7 | 386 | ieee802154_lowpan->sysctl.frags_hdr = hdr; |
7240cdec AA |
387 | return 0; |
388 | ||
389 | err_reg: | |
390 | if (!net_eq(net, &init_net)) | |
391 | kfree(table); | |
392 | err_alloc: | |
393 | return -ENOMEM; | |
394 | } | |
395 | ||
396 | static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net) | |
397 | { | |
bfa858f2 | 398 | const struct ctl_table *table; |
599018a7 LR |
399 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
400 | net_ieee802154_lowpan(net); | |
7240cdec | 401 | |
599018a7 LR |
402 | table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg; |
403 | unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr); | |
7240cdec AA |
404 | if (!net_eq(net, &init_net)) |
405 | kfree(table); | |
406 | } | |
407 | ||
408 | static struct ctl_table_header *lowpan_ctl_header; | |
409 | ||
3243acd3 | 410 | static int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
411 | { |
412 | lowpan_ctl_header = register_net_sysctl(&init_net, | |
413 | "net/ieee802154/6lowpan", | |
414 | lowpan_frags_ctl_table); | |
415 | return lowpan_ctl_header == NULL ? -ENOMEM : 0; | |
416 | } | |
417 | ||
418 | static void lowpan_frags_sysctl_unregister(void) | |
419 | { | |
420 | unregister_net_sysctl_table(lowpan_ctl_header); | |
421 | } | |
422 | #else | |
f0a0c1ce | 423 | static inline int lowpan_frags_ns_sysctl_register(struct net *net) |
7240cdec AA |
424 | { |
425 | return 0; | |
426 | } | |
427 | ||
428 | static inline void lowpan_frags_ns_sysctl_unregister(struct net *net) | |
429 | { | |
430 | } | |
431 | ||
f0a0c1ce | 432 | static inline int __init lowpan_frags_sysctl_register(void) |
7240cdec AA |
433 | { |
434 | return 0; | |
435 | } | |
436 | ||
437 | static inline void lowpan_frags_sysctl_unregister(void) | |
438 | { | |
439 | } | |
440 | #endif | |
441 | ||
442 | static int __net_init lowpan_frags_init_net(struct net *net) | |
443 | { | |
599018a7 LR |
444 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
445 | net_ieee802154_lowpan(net); | |
787bea77 | 446 | int res; |
7240cdec | 447 | |
599018a7 | 448 | |
a39aca67 | 449 | res = fqdir_init(&ieee802154_lowpan->fqdir, &lowpan_frags, net); |
787bea77 ED |
450 | if (res < 0) |
451 | return res; | |
4907abc6 ED |
452 | |
453 | ieee802154_lowpan->fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH; | |
454 | ieee802154_lowpan->fqdir->low_thresh = IPV6_FRAG_LOW_THRESH; | |
455 | ieee802154_lowpan->fqdir->timeout = IPV6_FRAG_TIMEOUT; | |
456 | ||
787bea77 ED |
457 | res = lowpan_frags_ns_sysctl_register(net); |
458 | if (res < 0) | |
4907abc6 | 459 | fqdir_exit(ieee802154_lowpan->fqdir); |
787bea77 | 460 | return res; |
7240cdec AA |
461 | } |
462 | ||
d5dd8879 ED |
463 | static void __net_exit lowpan_frags_pre_exit_net(struct net *net) |
464 | { | |
465 | struct netns_ieee802154_lowpan *ieee802154_lowpan = | |
466 | net_ieee802154_lowpan(net); | |
467 | ||
468 | fqdir_pre_exit(ieee802154_lowpan->fqdir); | |
469 | } | |
470 | ||
7240cdec AA |
471 | static void __net_exit lowpan_frags_exit_net(struct net *net) |
472 | { | |
599018a7 LR |
473 | struct netns_ieee802154_lowpan *ieee802154_lowpan = |
474 | net_ieee802154_lowpan(net); | |
475 | ||
7240cdec | 476 | lowpan_frags_ns_sysctl_unregister(net); |
4907abc6 | 477 | fqdir_exit(ieee802154_lowpan->fqdir); |
7240cdec AA |
478 | } |
479 | ||
480 | static struct pernet_operations lowpan_frags_ops = { | |
d5dd8879 ED |
481 | .init = lowpan_frags_init_net, |
482 | .pre_exit = lowpan_frags_pre_exit_net, | |
483 | .exit = lowpan_frags_exit_net, | |
7240cdec AA |
484 | }; |
485 | ||
648700f7 ED |
486 | static u32 lowpan_key_hashfn(const void *data, u32 len, u32 seed) |
487 | { | |
488 | return jhash2(data, | |
489 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
490 | } | |
491 | ||
492 | static u32 lowpan_obj_hashfn(const void *data, u32 len, u32 seed) | |
493 | { | |
494 | const struct inet_frag_queue *fq = data; | |
495 | ||
496 | return jhash2((const u32 *)&fq->key, | |
497 | sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); | |
498 | } | |
499 | ||
500 | static int lowpan_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) | |
501 | { | |
502 | const struct frag_lowpan_compare_key *key = arg->key; | |
503 | const struct inet_frag_queue *fq = ptr; | |
504 | ||
505 | return !!memcmp(&fq->key, key, sizeof(*key)); | |
506 | } | |
507 | ||
508 | static const struct rhashtable_params lowpan_rhash_params = { | |
509 | .head_offset = offsetof(struct inet_frag_queue, node), | |
510 | .hashfn = lowpan_key_hashfn, | |
511 | .obj_hashfn = lowpan_obj_hashfn, | |
512 | .obj_cmpfn = lowpan_obj_cmpfn, | |
513 | .automatic_shrinking = true, | |
514 | }; | |
515 | ||
7240cdec AA |
516 | int __init lowpan_net_frag_init(void) |
517 | { | |
518 | int ret; | |
519 | ||
7240cdec AA |
520 | lowpan_frags.constructor = lowpan_frag_init; |
521 | lowpan_frags.destructor = NULL; | |
7240cdec | 522 | lowpan_frags.qsize = sizeof(struct frag_queue); |
7240cdec | 523 | lowpan_frags.frag_expire = lowpan_frag_expire; |
d4ad4d22 | 524 | lowpan_frags.frags_cache_name = lowpan_frags_cache_name; |
648700f7 | 525 | lowpan_frags.rhash_params = lowpan_rhash_params; |
d4ad4d22 NA |
526 | ret = inet_frags_init(&lowpan_frags); |
527 | if (ret) | |
807f1844 | 528 | goto out; |
37147652 | 529 | |
807f1844 ED |
530 | ret = lowpan_frags_sysctl_register(); |
531 | if (ret) | |
532 | goto err_sysctl; | |
533 | ||
534 | ret = register_pernet_subsys(&lowpan_frags_ops); | |
535 | if (ret) | |
536 | goto err_pernet; | |
537 | out: | |
37147652 | 538 | return ret; |
7240cdec AA |
539 | err_pernet: |
540 | lowpan_frags_sysctl_unregister(); | |
807f1844 ED |
541 | err_sysctl: |
542 | inet_frags_fini(&lowpan_frags); | |
7240cdec AA |
543 | return ret; |
544 | } | |
545 | ||
546 | void lowpan_net_frag_exit(void) | |
547 | { | |
7240cdec AA |
548 | lowpan_frags_sysctl_unregister(); |
549 | unregister_pernet_subsys(&lowpan_frags_ops); | |
ae7352d3 | 550 | inet_frags_fini(&lowpan_frags); |
7240cdec | 551 | } |