1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * IPv6 fragment reassembly |
4 | * Linux INET6 implementation |
5 | * |
6 | * Authors: |
7 | * Pedro Roque <roque@di.fc.ul.pt> |
8 | * |
9 | * Based on: net/ipv4/ip_fragment.c |
10 | */ |
11 | |
12 | /* |
13 | * Fixes: |
14 | * Andi Kleen Make it work with multiple hosts. |
15 | * More RFC compliance. |
16 | * |
17 | * Horst von Brand Add missing #include <linux/string.h> |
18 | * Alexey Kuznetsov SMP races, threading, cleanup. |
19 | * Patrick McHardy LRU queue of frag heads for evictor. |
20 | * Mitsuru KANDA @USAGI Register inet6_protocol{}. |
21 | * David Stevens and |
22 | * YOSHIFUJI,H. @USAGI Always remove fragment header to |
23 | * calculate ICV correctly. |
24 | */ |
25 | |
26 | #define pr_fmt(fmt) "IPv6: " fmt |
27 | |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> |
30 | #include <linux/string.h> |
31 | #include <linux/socket.h> |
32 | #include <linux/sockios.h> |
33 | #include <linux/jiffies.h> |
34 | #include <linux/net.h> |
35 | #include <linux/list.h> |
36 | #include <linux/netdevice.h> |
37 | #include <linux/in6.h> |
38 | #include <linux/ipv6.h> |
39 | #include <linux/icmpv6.h> |
40 | #include <linux/random.h> |
41 | #include <linux/jhash.h> |
42 | #include <linux/skbuff.h> |
43 | #include <linux/slab.h> |
44 | #include <linux/export.h> |
45 | #include <linux/tcp.h> |
46 | #include <linux/udp.h> |
47 | |
48 | #include <net/sock.h> |
49 | #include <net/snmp.h> |
50 | |
51 | #include <net/ipv6.h> |
52 | #include <net/ip6_route.h> |
53 | #include <net/protocol.h> |
54 | #include <net/transp_v6.h> |
55 | #include <net/rawv6.h> |
56 | #include <net/ndisc.h> |
57 | #include <net/addrconf.h> |
58 | #include <net/ipv6_frag.h> |
59 | #include <net/inet_ecn.h> |
60 | |
61 | static const char ip6_frag_cache_name[] = "ip6-frags" ; |
62 | |
63 | static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) |
64 | { |
65 | return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); |
66 | } |
67 | |
68 | static struct inet_frags ip6_frags; |
69 | |
70 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb, |
71 | struct sk_buff *prev_tail, struct net_device *dev); |
72 | |
73 | static void ip6_frag_expire(struct timer_list *t) |
74 | { |
75 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
76 | struct frag_queue *fq; |
77 | |
78 | fq = container_of(frag, struct frag_queue, q); |
79 | |
80 | ip6frag_expire_frag_queue(net: fq->q.fqdir->net, fq); |
81 | } |
82 | |
83 | static struct frag_queue * |
84 | fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif) |
85 | { |
86 | struct frag_v6_compare_key key = { |
87 | .id = id, |
88 | .saddr = hdr->saddr, |
89 | .daddr = hdr->daddr, |
90 | .user = IP6_DEFRAG_LOCAL_DELIVER, |
91 | .iif = iif, |
92 | }; |
93 | struct inet_frag_queue *q; |
94 | |
95 | if (!(ipv6_addr_type(addr: &hdr->daddr) & (IPV6_ADDR_MULTICAST | |
96 | IPV6_ADDR_LINKLOCAL))) |
97 | key.iif = 0; |
98 | |
99 | q = inet_frag_find(fqdir: net->ipv6.fqdir, key: &key); |
100 | if (!q) |
101 | return NULL; |
102 | |
103 | return container_of(q, struct frag_queue, q); |
104 | } |
105 | |
106 | static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
107 | struct frag_hdr *fhdr, int nhoff, |
108 | u32 *prob_offset) |
109 | { |
110 | struct net *net = dev_net(dev: skb_dst(skb)->dev); |
111 | int offset, end, fragsize; |
112 | struct sk_buff *prev_tail; |
113 | struct net_device *dev; |
114 | int err = -ENOENT; |
115 | SKB_DR(reason); |
116 | u8 ecn; |
117 | |
118 | /* If reassembly is already done, @skb must be a duplicate frag. */ |
119 | if (fq->q.flags & INET_FRAG_COMPLETE) { |
120 | SKB_DR_SET(reason, DUP_FRAG); |
121 | goto err; |
122 | } |
123 | |
124 | err = -EINVAL; |
125 | offset = ntohs(fhdr->frag_off) & ~0x7; |
126 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
127 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
128 | |
129 | if ((unsigned int)end > IPV6_MAXPLEN) { |
130 | *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb); |
131 | /* note that if prob_offset is set, the skb is freed elsewhere, |
132 | * we do not free it here. |
133 | */ |
134 | return -1; |
135 | } |
136 | |
137 | ecn = ip6_frag_ecn(ipv6h: ipv6_hdr(skb)); |
138 | |
139 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
140 | const unsigned char *nh = skb_network_header(skb); |
141 | skb->csum = csum_sub(csum: skb->csum, |
142 | addend: csum_partial(buff: nh, len: (u8 *)(fhdr + 1) - nh, |
143 | sum: 0)); |
144 | } |
145 | |
146 | /* Is this the final fragment? */ |
147 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
148 | /* If we already have some bits beyond end |
149 | * or have different end, the segment is corrupted. |
150 | */ |
151 | if (end < fq->q.len || |
152 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
153 | goto discard_fq; |
154 | fq->q.flags |= INET_FRAG_LAST_IN; |
155 | fq->q.len = end; |
156 | } else { |
157 | /* Check if the fragment is rounded to 8 bytes. |
158 | * Required by the RFC. |
159 | */ |
160 | if (end & 0x7) { |
161 | /* RFC2460 says always send parameter problem in |
162 | * this case. -DaveM |
163 | */ |
164 | *prob_offset = offsetof(struct ipv6hdr, payload_len); |
165 | return -1; |
166 | } |
167 | if (end > fq->q.len) { |
168 | /* Some bits beyond end -> corruption. */ |
169 | if (fq->q.flags & INET_FRAG_LAST_IN) |
170 | goto discard_fq; |
171 | fq->q.len = end; |
172 | } |
173 | } |
174 | |
175 | if (end == offset) |
176 | goto discard_fq; |
177 | |
178 | err = -ENOMEM; |
179 | /* Point into the IP datagram 'data' part. */ |
180 | if (!pskb_pull(skb, len: (u8 *) (fhdr + 1) - skb->data)) |
181 | goto discard_fq; |
182 | |
183 | err = pskb_trim_rcsum(skb, len: end - offset); |
184 | if (err) |
185 | goto discard_fq; |
186 | |
187 | /* Note : skb->rbnode and skb->dev share the same location. */ |
188 | dev = skb->dev; |
189 | /* Makes sure compiler wont do silly aliasing games */ |
190 | barrier(); |
191 | |
192 | prev_tail = fq->q.fragments_tail; |
193 | err = inet_frag_queue_insert(q: &fq->q, skb, offset, end); |
194 | if (err) |
195 | goto insert_error; |
196 | |
197 | if (dev) |
198 | fq->iif = dev->ifindex; |
199 | |
200 | fq->q.stamp = skb->tstamp; |
201 | fq->q.mono_delivery_time = skb->mono_delivery_time; |
202 | fq->q.meat += skb->len; |
203 | fq->ecn |= ecn; |
204 | add_frag_mem_limit(fqdir: fq->q.fqdir, val: skb->truesize); |
205 | |
206 | fragsize = -skb_network_offset(skb) + skb->len; |
207 | if (fragsize > fq->q.max_size) |
208 | fq->q.max_size = fragsize; |
209 | |
210 | /* The first fragment. |
211 | * nhoffset is obtained from the first fragment, of course. |
212 | */ |
213 | if (offset == 0) { |
214 | fq->nhoffset = nhoff; |
215 | fq->q.flags |= INET_FRAG_FIRST_IN; |
216 | } |
217 | |
218 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
219 | fq->q.meat == fq->q.len) { |
220 | unsigned long orefdst = skb->_skb_refdst; |
221 | |
222 | skb->_skb_refdst = 0UL; |
223 | err = ip6_frag_reasm(fq, skb, prev_tail, dev); |
224 | skb->_skb_refdst = orefdst; |
225 | return err; |
226 | } |
227 | |
228 | skb_dst_drop(skb); |
229 | return -EINPROGRESS; |
230 | |
231 | insert_error: |
232 | if (err == IPFRAG_DUP) { |
233 | SKB_DR_SET(reason, DUP_FRAG); |
234 | err = -EINVAL; |
235 | goto err; |
236 | } |
237 | err = -EINVAL; |
238 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
239 | IPSTATS_MIB_REASM_OVERLAPS); |
240 | discard_fq: |
241 | inet_frag_kill(q: &fq->q); |
242 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
243 | IPSTATS_MIB_REASMFAILS); |
244 | err: |
245 | kfree_skb_reason(skb, reason); |
246 | return err; |
247 | } |
248 | |
249 | /* |
250 | * Check if this packet is complete. |
251 | * |
252 | * It is called with locked fq, and caller must check that |
253 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
254 | * the last and the first frames arrived and all the bits are here. |
255 | */ |
256 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb, |
257 | struct sk_buff *prev_tail, struct net_device *dev) |
258 | { |
259 | struct net *net = fq->q.fqdir->net; |
260 | unsigned int nhoff; |
261 | void *reasm_data; |
262 | int payload_len; |
263 | u8 ecn; |
264 | |
265 | inet_frag_kill(q: &fq->q); |
266 | |
267 | ecn = ip_frag_ecn_table[fq->ecn]; |
268 | if (unlikely(ecn == 0xff)) |
269 | goto out_fail; |
270 | |
271 | reasm_data = inet_frag_reasm_prepare(q: &fq->q, skb, parent: prev_tail); |
272 | if (!reasm_data) |
273 | goto out_oom; |
274 | |
275 | payload_len = ((skb->data - skb_network_header(skb)) - |
276 | sizeof(struct ipv6hdr) + fq->q.len - |
277 | sizeof(struct frag_hdr)); |
278 | if (payload_len > IPV6_MAXPLEN) |
279 | goto out_oversize; |
280 | |
281 | /* We have to remove fragment header from datagram and to relocate |
282 | * header in order to calculate ICV correctly. */ |
283 | nhoff = fq->nhoffset; |
284 | skb_network_header(skb)[nhoff] = skb_transport_header(skb)[0]; |
285 | memmove(skb->head + sizeof(struct frag_hdr), skb->head, |
286 | (skb->data - skb->head) - sizeof(struct frag_hdr)); |
287 | if (skb_mac_header_was_set(skb)) |
288 | skb->mac_header += sizeof(struct frag_hdr); |
289 | skb->network_header += sizeof(struct frag_hdr); |
290 | |
291 | skb_reset_transport_header(skb); |
292 | |
293 | inet_frag_reasm_finish(q: &fq->q, head: skb, reasm_data, try_coalesce: true); |
294 | |
295 | skb->dev = dev; |
296 | ipv6_hdr(skb)->payload_len = htons(payload_len); |
297 | ipv6_change_dsfield(ipv6h: ipv6_hdr(skb), mask: 0xff, value: ecn); |
298 | IP6CB(skb)->nhoff = nhoff; |
299 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
300 | IP6CB(skb)->frag_max_size = fq->q.max_size; |
301 | |
302 | /* Yes, and fold redundant checksum back. 8) */ |
303 | skb_postpush_rcsum(skb, start: skb_network_header(skb), |
304 | len: skb_network_header_len(skb)); |
305 | |
306 | rcu_read_lock(); |
307 | __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMOKS); |
308 | rcu_read_unlock(); |
309 | fq->q.rb_fragments = RB_ROOT; |
310 | fq->q.fragments_tail = NULL; |
311 | fq->q.last_run_head = NULL; |
312 | return 1; |
313 | |
314 | out_oversize: |
315 | net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n" , payload_len); |
316 | goto out_fail; |
317 | out_oom: |
318 | net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n" ); |
319 | out_fail: |
320 | rcu_read_lock(); |
321 | __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMFAILS); |
322 | rcu_read_unlock(); |
323 | inet_frag_kill(q: &fq->q); |
324 | return -1; |
325 | } |
326 | |
327 | static int ipv6_frag_rcv(struct sk_buff *skb) |
328 | { |
329 | struct frag_hdr *fhdr; |
330 | struct frag_queue *fq; |
331 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
332 | struct net *net = dev_net(dev: skb_dst(skb)->dev); |
333 | u8 nexthdr; |
334 | int iif; |
335 | |
336 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED) |
337 | goto fail_hdr; |
338 | |
339 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
340 | |
341 | /* Jumbo payload inhibits frag. header */ |
342 | if (hdr->payload_len == 0) |
343 | goto fail_hdr; |
344 | |
345 | if (!pskb_may_pull(skb, len: (skb_transport_offset(skb) + |
346 | sizeof(struct frag_hdr)))) |
347 | goto fail_hdr; |
348 | |
349 | hdr = ipv6_hdr(skb); |
350 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
351 | |
352 | if (!(fhdr->frag_off & htons(IP6_OFFSET | IP6_MF))) { |
353 | /* It is not a fragmented frame */ |
354 | skb->transport_header += sizeof(struct frag_hdr); |
355 | __IP6_INC_STATS(net, |
356 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); |
357 | |
358 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
359 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
360 | IP6CB(skb)->frag_max_size = ntohs(hdr->payload_len) + |
361 | sizeof(struct ipv6hdr); |
362 | return 1; |
363 | } |
364 | |
365 | /* RFC 8200, Section 4.5 Fragment Header: |
366 | * If the first fragment does not include all headers through an |
367 | * Upper-Layer header, then that fragment should be discarded and |
368 | * an ICMP Parameter Problem, Code 3, message should be sent to |
369 | * the source of the fragment, with the Pointer field set to zero. |
370 | */ |
371 | nexthdr = hdr->nexthdr; |
372 | if (ipv6frag_thdr_truncated(skb, start: skb_transport_offset(skb), nexthdrp: &nexthdr)) { |
373 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
374 | IPSTATS_MIB_INHDRERRORS); |
375 | icmpv6_param_prob(skb, ICMPV6_HDR_INCOMP, pos: 0); |
376 | return -1; |
377 | } |
378 | |
379 | iif = skb->dev ? skb->dev->ifindex : 0; |
380 | fq = fq_find(net, id: fhdr->identification, hdr, iif); |
381 | if (fq) { |
382 | u32 prob_offset = 0; |
383 | int ret; |
384 | |
385 | spin_lock(lock: &fq->q.lock); |
386 | |
387 | fq->iif = iif; |
388 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff, |
389 | prob_offset: &prob_offset); |
390 | |
391 | spin_unlock(lock: &fq->q.lock); |
392 | inet_frag_put(q: &fq->q); |
393 | if (prob_offset) { |
394 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
395 | IPSTATS_MIB_INHDRERRORS); |
396 | /* icmpv6_param_prob() calls kfree_skb(skb) */ |
397 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, pos: prob_offset); |
398 | } |
399 | return ret; |
400 | } |
401 | |
402 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
403 | kfree_skb(skb); |
404 | return -1; |
405 | |
406 | fail_hdr: |
407 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
408 | IPSTATS_MIB_INHDRERRORS); |
409 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, pos: skb_network_header_len(skb)); |
410 | return -1; |
411 | } |
412 | |
413 | static const struct inet6_protocol frag_protocol = { |
414 | .handler = ipv6_frag_rcv, |
415 | .flags = INET6_PROTO_NOPOLICY, |
416 | }; |
417 | |
418 | #ifdef CONFIG_SYSCTL |
419 | |
420 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
421 | { |
422 | .procname = "ip6frag_high_thresh" , |
423 | .maxlen = sizeof(unsigned long), |
424 | .mode = 0644, |
425 | .proc_handler = proc_doulongvec_minmax, |
426 | }, |
427 | { |
428 | .procname = "ip6frag_low_thresh" , |
429 | .maxlen = sizeof(unsigned long), |
430 | .mode = 0644, |
431 | .proc_handler = proc_doulongvec_minmax, |
432 | }, |
433 | { |
434 | .procname = "ip6frag_time" , |
435 | .maxlen = sizeof(int), |
436 | .mode = 0644, |
437 | .proc_handler = proc_dointvec_jiffies, |
438 | }, |
439 | { } |
440 | }; |
441 | |
442 | /* secret interval has been deprecated */ |
443 | static int ip6_frags_secret_interval_unused; |
444 | static struct ctl_table ip6_frags_ctl_table[] = { |
445 | { |
446 | .procname = "ip6frag_secret_interval" , |
447 | .data = &ip6_frags_secret_interval_unused, |
448 | .maxlen = sizeof(int), |
449 | .mode = 0644, |
450 | .proc_handler = proc_dointvec_jiffies, |
451 | }, |
452 | { } |
453 | }; |
454 | |
455 | static int __net_init ip6_frags_ns_sysctl_register(struct net *net) |
456 | { |
457 | struct ctl_table *table; |
458 | struct ctl_table_header *hdr; |
459 | |
460 | table = ip6_frags_ns_ctl_table; |
461 | if (!net_eq(net1: net, net2: &init_net)) { |
462 | table = kmemdup(p: table, size: sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
463 | if (!table) |
464 | goto err_alloc; |
465 | |
466 | } |
467 | table[0].data = &net->ipv6.fqdir->high_thresh; |
468 | table[0].extra1 = &net->ipv6.fqdir->low_thresh; |
469 | table[1].data = &net->ipv6.fqdir->low_thresh; |
470 | table[1].extra2 = &net->ipv6.fqdir->high_thresh; |
471 | table[2].data = &net->ipv6.fqdir->timeout; |
472 | |
473 | hdr = register_net_sysctl_sz(net, path: "net/ipv6" , table, |
474 | ARRAY_SIZE(ip6_frags_ns_ctl_table)); |
475 | if (!hdr) |
476 | goto err_reg; |
477 | |
478 | net->ipv6.sysctl.frags_hdr = hdr; |
479 | return 0; |
480 | |
481 | err_reg: |
482 | if (!net_eq(net1: net, net2: &init_net)) |
483 | kfree(objp: table); |
484 | err_alloc: |
485 | return -ENOMEM; |
486 | } |
487 | |
488 | static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net) |
489 | { |
490 | struct ctl_table *table; |
491 | |
492 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; |
493 | unregister_net_sysctl_table(header: net->ipv6.sysctl.frags_hdr); |
494 | if (!net_eq(net1: net, net2: &init_net)) |
495 | kfree(objp: table); |
496 | } |
497 | |
498 | static struct ctl_table_header *; |
499 | |
500 | static int ip6_frags_sysctl_register(void) |
501 | { |
502 | ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6" , |
503 | ip6_frags_ctl_table); |
504 | return ip6_ctl_header == NULL ? -ENOMEM : 0; |
505 | } |
506 | |
507 | static void ip6_frags_sysctl_unregister(void) |
508 | { |
509 | unregister_net_sysctl_table(header: ip6_ctl_header); |
510 | } |
511 | #else |
512 | static int ip6_frags_ns_sysctl_register(struct net *net) |
513 | { |
514 | return 0; |
515 | } |
516 | |
517 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
518 | { |
519 | } |
520 | |
521 | static int ip6_frags_sysctl_register(void) |
522 | { |
523 | return 0; |
524 | } |
525 | |
526 | static void ip6_frags_sysctl_unregister(void) |
527 | { |
528 | } |
529 | #endif |
530 | |
531 | static int __net_init ipv6_frags_init_net(struct net *net) |
532 | { |
533 | int res; |
534 | |
535 | res = fqdir_init(fqdirp: &net->ipv6.fqdir, f: &ip6_frags, net); |
536 | if (res < 0) |
537 | return res; |
538 | |
539 | net->ipv6.fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH; |
540 | net->ipv6.fqdir->low_thresh = IPV6_FRAG_LOW_THRESH; |
541 | net->ipv6.fqdir->timeout = IPV6_FRAG_TIMEOUT; |
542 | |
543 | res = ip6_frags_ns_sysctl_register(net); |
544 | if (res < 0) |
545 | fqdir_exit(fqdir: net->ipv6.fqdir); |
546 | return res; |
547 | } |
548 | |
549 | static void __net_exit ipv6_frags_pre_exit_net(struct net *net) |
550 | { |
551 | fqdir_pre_exit(fqdir: net->ipv6.fqdir); |
552 | } |
553 | |
554 | static void __net_exit ipv6_frags_exit_net(struct net *net) |
555 | { |
556 | ip6_frags_ns_sysctl_unregister(net); |
557 | fqdir_exit(fqdir: net->ipv6.fqdir); |
558 | } |
559 | |
560 | static struct pernet_operations ip6_frags_ops = { |
561 | .init = ipv6_frags_init_net, |
562 | .pre_exit = ipv6_frags_pre_exit_net, |
563 | .exit = ipv6_frags_exit_net, |
564 | }; |
565 | |
566 | static const struct rhashtable_params ip6_rhash_params = { |
567 | .head_offset = offsetof(struct inet_frag_queue, node), |
568 | .hashfn = ip6frag_key_hashfn, |
569 | .obj_hashfn = ip6frag_obj_hashfn, |
570 | .obj_cmpfn = ip6frag_obj_cmpfn, |
571 | .automatic_shrinking = true, |
572 | }; |
573 | |
574 | int __init ipv6_frag_init(void) |
575 | { |
576 | int ret; |
577 | |
578 | ip6_frags.constructor = ip6frag_init; |
579 | ip6_frags.destructor = NULL; |
580 | ip6_frags.qsize = sizeof(struct frag_queue); |
581 | ip6_frags.frag_expire = ip6_frag_expire; |
582 | ip6_frags.frags_cache_name = ip6_frag_cache_name; |
583 | ip6_frags.rhash_params = ip6_rhash_params; |
584 | ret = inet_frags_init(&ip6_frags); |
585 | if (ret) |
586 | goto out; |
587 | |
588 | ret = inet6_add_protocol(prot: &frag_protocol, IPPROTO_FRAGMENT); |
589 | if (ret) |
590 | goto err_protocol; |
591 | |
592 | ret = ip6_frags_sysctl_register(); |
593 | if (ret) |
594 | goto err_sysctl; |
595 | |
596 | ret = register_pernet_subsys(&ip6_frags_ops); |
597 | if (ret) |
598 | goto err_pernet; |
599 | |
600 | out: |
601 | return ret; |
602 | |
603 | err_pernet: |
604 | ip6_frags_sysctl_unregister(); |
605 | err_sysctl: |
606 | inet6_del_protocol(prot: &frag_protocol, IPPROTO_FRAGMENT); |
607 | err_protocol: |
608 | inet_frags_fini(&ip6_frags); |
609 | goto out; |
610 | } |
611 | |
612 | void ipv6_frag_exit(void) |
613 | { |
614 | ip6_frags_sysctl_unregister(); |
615 | unregister_pernet_subsys(&ip6_frags_ops); |
616 | inet6_del_protocol(prot: &frag_protocol, IPPROTO_FRAGMENT); |
617 | inet_frags_fini(&ip6_frags); |
618 | } |
619 | |