Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 fragment reassembly | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * Based on: net/ipv4/ip_fragment.c |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
1ab1457c YH |
16 | /* |
17 | * Fixes: | |
1da177e4 LT |
18 | * Andi Kleen Make it work with multiple hosts. |
19 | * More RFC compliance. | |
20 | * | |
21 | * Horst von Brand Add missing #include <linux/string.h> | |
22 | * Alexey Kuznetsov SMP races, threading, cleanup. | |
23 | * Patrick McHardy LRU queue of frag heads for evictor. | |
24 | * Mitsuru KANDA @USAGI Register inet6_protocol{}. | |
25 | * David Stevens and | |
26 | * YOSHIFUJI,H. @USAGI Always remove fragment header to | |
27 | * calculate ICV correctly. | |
28 | */ | |
5a3da1fe HFS |
29 | |
30 | #define pr_fmt(fmt) "IPv6: " fmt | |
31 | ||
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/types.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/sockios.h> | |
37 | #include <linux/jiffies.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/list.h> | |
40 | #include <linux/netdevice.h> | |
41 | #include <linux/in6.h> | |
42 | #include <linux/ipv6.h> | |
43 | #include <linux/icmpv6.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/jhash.h> | |
f61944ef | 46 | #include <linux/skbuff.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
bc3b2d7f | 48 | #include <linux/export.h> |
1da177e4 LT |
49 | |
50 | #include <net/sock.h> | |
51 | #include <net/snmp.h> | |
52 | ||
53 | #include <net/ipv6.h> | |
a11d206d | 54 | #include <net/ip6_route.h> |
1da177e4 LT |
55 | #include <net/protocol.h> |
56 | #include <net/transp_v6.h> | |
57 | #include <net/rawv6.h> | |
58 | #include <net/ndisc.h> | |
59 | #include <net/addrconf.h> | |
70b095c8 | 60 | #include <net/ipv6_frag.h> |
eec2e618 | 61 | #include <net/inet_ecn.h> |
1da177e4 | 62 | |
d4ad4d22 NA |
63 | static const char ip6_frag_cache_name[] = "ip6-frags"; |
64 | ||
fc08c258 | 65 | static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) |
eec2e618 HFS |
66 | { |
67 | return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); | |
68 | } | |
1da177e4 | 69 | |
7eb95156 | 70 | static struct inet_frags ip6_frags; |
1da177e4 | 71 | |
f61944ef HX |
72 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
73 | struct net_device *dev); | |
74 | ||
78802011 | 75 | static void ip6_frag_expire(struct timer_list *t) |
b836c99f | 76 | { |
78802011 | 77 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
b836c99f AW |
78 | struct frag_queue *fq; |
79 | struct net *net; | |
80 | ||
78802011 | 81 | fq = container_of(frag, struct frag_queue, q); |
b836c99f AW |
82 | net = container_of(fq->q.net, struct net, ipv6.frags); |
83 | ||
70b095c8 | 84 | ip6frag_expire_frag_queue(net, fq); |
1da177e4 LT |
85 | } |
86 | ||
fc08c258 | 87 | static struct frag_queue * |
648700f7 | 88 | fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif) |
1da177e4 | 89 | { |
648700f7 ED |
90 | struct frag_v6_compare_key key = { |
91 | .id = id, | |
92 | .saddr = hdr->saddr, | |
93 | .daddr = hdr->daddr, | |
94 | .user = IP6_DEFRAG_LOCAL_DELIVER, | |
95 | .iif = iif, | |
96 | }; | |
c6fda282 | 97 | struct inet_frag_queue *q; |
9a375803 | 98 | |
648700f7 ED |
99 | if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST | |
100 | IPV6_ADDR_LINKLOCAL))) | |
101 | key.iif = 0; | |
1da177e4 | 102 | |
648700f7 | 103 | q = inet_frag_find(&net->ipv6.frags, &key); |
2d44ed22 | 104 | if (!q) |
9546377c | 105 | return NULL; |
2d44ed22 | 106 | |
c6fda282 | 107 | return container_of(q, struct frag_queue, q); |
1da177e4 LT |
108 | } |
109 | ||
f61944ef | 110 | static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
415787d7 ED |
111 | struct frag_hdr *fhdr, int nhoff, |
112 | u32 *prob_offset) | |
1da177e4 LT |
113 | { |
114 | struct sk_buff *prev, *next; | |
f61944ef | 115 | struct net_device *dev; |
dbd1759e | 116 | int offset, end, fragsize; |
adf30907 | 117 | struct net *net = dev_net(skb_dst(skb)->dev); |
eec2e618 | 118 | u8 ecn; |
1da177e4 | 119 | |
06aa8b8a | 120 | if (fq->q.flags & INET_FRAG_COMPLETE) |
1da177e4 LT |
121 | goto err; |
122 | ||
123 | offset = ntohs(fhdr->frag_off) & ~0x7; | |
0660e03f ACM |
124 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
125 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); | |
1da177e4 LT |
126 | |
127 | if ((unsigned int)end > IPV6_MAXPLEN) { | |
415787d7 | 128 | *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb); |
f61944ef | 129 | return -1; |
1da177e4 LT |
130 | } |
131 | ||
eec2e618 HFS |
132 | ecn = ip6_frag_ecn(ipv6_hdr(skb)); |
133 | ||
d56f90a7 ACM |
134 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
135 | const unsigned char *nh = skb_network_header(skb); | |
1ab1457c | 136 | skb->csum = csum_sub(skb->csum, |
d56f90a7 ACM |
137 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
138 | 0)); | |
139 | } | |
1da177e4 LT |
140 | |
141 | /* Is this the final fragment? */ | |
142 | if (!(fhdr->frag_off & htons(IP6_MF))) { | |
143 | /* If we already have some bits beyond end | |
144 | * or have different end, the segment is corrupted. | |
145 | */ | |
5ab11c98 | 146 | if (end < fq->q.len || |
06aa8b8a | 147 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
1da177e4 | 148 | goto err; |
06aa8b8a | 149 | fq->q.flags |= INET_FRAG_LAST_IN; |
5ab11c98 | 150 | fq->q.len = end; |
1da177e4 LT |
151 | } else { |
152 | /* Check if the fragment is rounded to 8 bytes. | |
153 | * Required by the RFC. | |
154 | */ | |
155 | if (end & 0x7) { | |
156 | /* RFC2460 says always send parameter problem in | |
157 | * this case. -DaveM | |
158 | */ | |
415787d7 | 159 | *prob_offset = offsetof(struct ipv6hdr, payload_len); |
f61944ef | 160 | return -1; |
1da177e4 | 161 | } |
5ab11c98 | 162 | if (end > fq->q.len) { |
1da177e4 | 163 | /* Some bits beyond end -> corruption. */ |
06aa8b8a | 164 | if (fq->q.flags & INET_FRAG_LAST_IN) |
1da177e4 | 165 | goto err; |
5ab11c98 | 166 | fq->q.len = end; |
1da177e4 LT |
167 | } |
168 | } | |
169 | ||
170 | if (end == offset) | |
171 | goto err; | |
172 | ||
173 | /* Point into the IP datagram 'data' part. */ | |
174 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) | |
175 | goto err; | |
1ab1457c | 176 | |
42ca89c1 SH |
177 | if (pskb_trim_rcsum(skb, end - offset)) |
178 | goto err; | |
1da177e4 LT |
179 | |
180 | /* Find out which fragments are in front and at the back of us | |
181 | * in the chain of fragments so far. We must know where to put | |
182 | * this fragment, right? | |
183 | */ | |
d6bebca9 | 184 | prev = fq->q.fragments_tail; |
219badfa | 185 | if (!prev || prev->ip_defrag_offset < offset) { |
d6bebca9 CG |
186 | next = NULL; |
187 | goto found; | |
188 | } | |
1da177e4 | 189 | prev = NULL; |
67ba4152 | 190 | for (next = fq->q.fragments; next != NULL; next = next->next) { |
219badfa | 191 | if (next->ip_defrag_offset >= offset) |
1da177e4 LT |
192 | break; /* bingo! */ |
193 | prev = next; | |
194 | } | |
195 | ||
d6bebca9 | 196 | found: |
5de658f8 ED |
197 | /* RFC5722, Section 4, amended by Errata ID : 3089 |
198 | * When reassembling an IPv6 datagram, if | |
70789d70 ND |
199 | * one or more its constituent fragments is determined to be an |
200 | * overlapping fragment, the entire datagram (and any constituent | |
5de658f8 | 201 | * fragments) MUST be silently discarded. |
1da177e4 | 202 | */ |
1da177e4 | 203 | |
70789d70 ND |
204 | /* Check for overlap with preceding fragment. */ |
205 | if (prev && | |
219badfa | 206 | (prev->ip_defrag_offset + prev->len) > offset) |
70789d70 | 207 | goto discard_fq; |
1da177e4 | 208 | |
70789d70 | 209 | /* Look for overlap with succeeding segment. */ |
219badfa | 210 | if (next && next->ip_defrag_offset < end) |
70789d70 | 211 | goto discard_fq; |
1da177e4 | 212 | |
219badfa ED |
213 | /* Note : skb->ip_defrag_offset and skb->dev share the same location */ |
214 | dev = skb->dev; | |
215 | if (dev) | |
216 | fq->iif = dev->ifindex; | |
217 | /* Makes sure compiler wont do silly aliasing games */ | |
218 | barrier(); | |
219 | skb->ip_defrag_offset = offset; | |
1da177e4 LT |
220 | |
221 | /* Insert this fragment in the chain of fragments. */ | |
222 | skb->next = next; | |
d6bebca9 CG |
223 | if (!next) |
224 | fq->q.fragments_tail = skb; | |
1da177e4 LT |
225 | if (prev) |
226 | prev->next = skb; | |
227 | else | |
5ab11c98 | 228 | fq->q.fragments = skb; |
1da177e4 | 229 | |
5ab11c98 PE |
230 | fq->q.stamp = skb->tstamp; |
231 | fq->q.meat += skb->len; | |
eec2e618 | 232 | fq->ecn |= ecn; |
0e60d245 | 233 | add_frag_mem_limit(fq->q.net, skb->truesize); |
1da177e4 | 234 | |
dbd1759e WB |
235 | fragsize = -skb_network_offset(skb) + skb->len; |
236 | if (fragsize > fq->q.max_size) | |
237 | fq->q.max_size = fragsize; | |
238 | ||
1da177e4 LT |
239 | /* The first fragment. |
240 | * nhoffset is obtained from the first fragment, of course. | |
241 | */ | |
242 | if (offset == 0) { | |
243 | fq->nhoffset = nhoff; | |
06aa8b8a | 244 | fq->q.flags |= INET_FRAG_FIRST_IN; |
1da177e4 | 245 | } |
f61944ef | 246 | |
06aa8b8a | 247 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
97599dc7 ED |
248 | fq->q.meat == fq->q.len) { |
249 | int res; | |
250 | unsigned long orefdst = skb->_skb_refdst; | |
251 | ||
252 | skb->_skb_refdst = 0UL; | |
253 | res = ip6_frag_reasm(fq, prev, dev); | |
254 | skb->_skb_refdst = orefdst; | |
255 | return res; | |
256 | } | |
f61944ef | 257 | |
97599dc7 | 258 | skb_dst_drop(skb); |
f61944ef | 259 | return -1; |
1da177e4 | 260 | |
70789d70 | 261 | discard_fq: |
093ba729 | 262 | inet_frag_kill(&fq->q); |
1da177e4 | 263 | err: |
1d015503 ED |
264 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
265 | IPSTATS_MIB_REASMFAILS); | |
1da177e4 | 266 | kfree_skb(skb); |
f61944ef | 267 | return -1; |
1da177e4 LT |
268 | } |
269 | ||
270 | /* | |
271 | * Check if this packet is complete. | |
272 | * Returns NULL on failure by any reason, and pointer | |
273 | * to current nexthdr field in reassembled frame. | |
274 | * | |
275 | * It is called with locked fq, and caller must check that | |
276 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
277 | * the last and the first frames arrived and all the bits are here. | |
278 | */ | |
f61944ef | 279 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
1da177e4 LT |
280 | struct net_device *dev) |
281 | { | |
2bad35b7 | 282 | struct net *net = container_of(fq->q.net, struct net, ipv6.frags); |
5ab11c98 | 283 | struct sk_buff *fp, *head = fq->q.fragments; |
1da177e4 LT |
284 | int payload_len; |
285 | unsigned int nhoff; | |
ec16439e | 286 | int sum_truesize; |
eec2e618 | 287 | u8 ecn; |
1da177e4 | 288 | |
093ba729 | 289 | inet_frag_kill(&fq->q); |
1da177e4 | 290 | |
eec2e618 HFS |
291 | ecn = ip_frag_ecn_table[fq->ecn]; |
292 | if (unlikely(ecn == 0xff)) | |
293 | goto out_fail; | |
294 | ||
f61944ef HX |
295 | /* Make the one we just received the head. */ |
296 | if (prev) { | |
297 | head = prev->next; | |
298 | fp = skb_clone(head, GFP_ATOMIC); | |
299 | ||
300 | if (!fp) | |
301 | goto out_oom; | |
302 | ||
303 | fp->next = head->next; | |
d6bebca9 CG |
304 | if (!fp->next) |
305 | fq->q.fragments_tail = fp; | |
f61944ef HX |
306 | prev->next = fp; |
307 | ||
5ab11c98 PE |
308 | skb_morph(head, fq->q.fragments); |
309 | head->next = fq->q.fragments->next; | |
f61944ef | 310 | |
808db80a | 311 | consume_skb(fq->q.fragments); |
5ab11c98 | 312 | fq->q.fragments = head; |
f61944ef HX |
313 | } |
314 | ||
547b792c | 315 | WARN_ON(head == NULL); |
219badfa | 316 | WARN_ON(head->ip_defrag_offset != 0); |
1da177e4 LT |
317 | |
318 | /* Unfragmented part is taken from the first segment. */ | |
d56f90a7 | 319 | payload_len = ((head->data - skb_network_header(head)) - |
5ab11c98 | 320 | sizeof(struct ipv6hdr) + fq->q.len - |
d56f90a7 | 321 | sizeof(struct frag_hdr)); |
1da177e4 LT |
322 | if (payload_len > IPV6_MAXPLEN) |
323 | goto out_oversize; | |
324 | ||
325 | /* Head of list must not be cloned. */ | |
14bbd6a5 | 326 | if (skb_unclone(head, GFP_ATOMIC)) |
1da177e4 LT |
327 | goto out_oom; |
328 | ||
329 | /* If the first fragment is fragmented itself, we split | |
330 | * it to two chunks: the first with data and paged part | |
331 | * and the second, holding only fragments. */ | |
21dc3301 | 332 | if (skb_has_frag_list(head)) { |
1da177e4 LT |
333 | struct sk_buff *clone; |
334 | int i, plen = 0; | |
335 | ||
e5d08d71 | 336 | clone = alloc_skb(0, GFP_ATOMIC); |
63159f29 | 337 | if (!clone) |
1da177e4 LT |
338 | goto out_oom; |
339 | clone->next = head->next; | |
340 | head->next = clone; | |
341 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; | |
4d9092bb | 342 | skb_frag_list_init(head); |
9e903e08 ED |
343 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) |
344 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); | |
1da177e4 LT |
345 | clone->len = clone->data_len = head->data_len - plen; |
346 | head->data_len -= clone->len; | |
347 | head->len -= clone->len; | |
348 | clone->csum = 0; | |
349 | clone->ip_summed = head->ip_summed; | |
0e60d245 | 350 | add_frag_mem_limit(fq->q.net, clone->truesize); |
1da177e4 LT |
351 | } |
352 | ||
353 | /* We have to remove fragment header from datagram and to relocate | |
354 | * header in order to calculate ICV correctly. */ | |
355 | nhoff = fq->nhoffset; | |
b0e380b1 | 356 | skb_network_header(head)[nhoff] = skb_transport_header(head)[0]; |
1ab1457c | 357 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
1da177e4 | 358 | (head->data - head->head) - sizeof(struct frag_hdr)); |
b678aa57 JD |
359 | if (skb_mac_header_was_set(head)) |
360 | head->mac_header += sizeof(struct frag_hdr); | |
b0e380b1 | 361 | head->network_header += sizeof(struct frag_hdr); |
1da177e4 | 362 | |
badff6d0 | 363 | skb_reset_transport_header(head); |
d56f90a7 | 364 | skb_push(head, head->data - skb_network_header(head)); |
1da177e4 | 365 | |
ec16439e ED |
366 | sum_truesize = head->truesize; |
367 | for (fp = head->next; fp;) { | |
368 | bool headstolen; | |
369 | int delta; | |
370 | struct sk_buff *next = fp->next; | |
371 | ||
372 | sum_truesize += fp->truesize; | |
1da177e4 LT |
373 | if (head->ip_summed != fp->ip_summed) |
374 | head->ip_summed = CHECKSUM_NONE; | |
84fa7933 | 375 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 | 376 | head->csum = csum_add(head->csum, fp->csum); |
ec16439e ED |
377 | |
378 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { | |
379 | kfree_skb_partial(fp, headstolen); | |
380 | } else { | |
381 | if (!skb_shinfo(head)->frag_list) | |
382 | skb_shinfo(head)->frag_list = fp; | |
383 | head->data_len += fp->len; | |
384 | head->len += fp->len; | |
385 | head->truesize += fp->truesize; | |
386 | } | |
387 | fp = next; | |
1da177e4 | 388 | } |
0e60d245 | 389 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
1da177e4 LT |
390 | |
391 | head->next = NULL; | |
392 | head->dev = dev; | |
5ab11c98 | 393 | head->tstamp = fq->q.stamp; |
0660e03f | 394 | ipv6_hdr(head)->payload_len = htons(payload_len); |
eec2e618 | 395 | ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn); |
951dbc8a | 396 | IP6CB(head)->nhoff = nhoff; |
f46078cf | 397 | IP6CB(head)->flags |= IP6SKB_FRAGMENTED; |
dbd1759e | 398 | IP6CB(head)->frag_max_size = fq->q.max_size; |
1da177e4 | 399 | |
1da177e4 | 400 | /* Yes, and fold redundant checksum back. 8) */ |
6b83d28a DB |
401 | skb_postpush_rcsum(head, skb_network_header(head), |
402 | skb_network_header_len(head)); | |
1da177e4 | 403 | |
a11d206d | 404 | rcu_read_lock(); |
1d015503 | 405 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS); |
a11d206d | 406 | rcu_read_unlock(); |
5ab11c98 | 407 | fq->q.fragments = NULL; |
d6bebca9 | 408 | fq->q.fragments_tail = NULL; |
1da177e4 LT |
409 | return 1; |
410 | ||
411 | out_oversize: | |
e87cc472 | 412 | net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len); |
1da177e4 LT |
413 | goto out_fail; |
414 | out_oom: | |
e87cc472 | 415 | net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n"); |
1da177e4 | 416 | out_fail: |
a11d206d | 417 | rcu_read_lock(); |
1d015503 | 418 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
a11d206d | 419 | rcu_read_unlock(); |
1da177e4 LT |
420 | return -1; |
421 | } | |
422 | ||
e5bbef20 | 423 | static int ipv6_frag_rcv(struct sk_buff *skb) |
1da177e4 | 424 | { |
1da177e4 LT |
425 | struct frag_hdr *fhdr; |
426 | struct frag_queue *fq; | |
b71d1d42 | 427 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
adf30907 | 428 | struct net *net = dev_net(skb_dst(skb)->dev); |
648700f7 | 429 | int iif; |
1da177e4 | 430 | |
f46078cf HFS |
431 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED) |
432 | goto fail_hdr; | |
433 | ||
1d015503 | 434 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
1da177e4 LT |
435 | |
436 | /* Jumbo payload inhibits frag. header */ | |
67ba4152 | 437 | if (hdr->payload_len == 0) |
98b3377c DL |
438 | goto fail_hdr; |
439 | ||
ea2ae17d | 440 | if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
98b3377c DL |
441 | sizeof(struct frag_hdr)))) |
442 | goto fail_hdr; | |
1da177e4 | 443 | |
0660e03f | 444 | hdr = ipv6_hdr(skb); |
9c70220b | 445 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
1da177e4 LT |
446 | |
447 | if (!(fhdr->frag_off & htons(0xFFF9))) { | |
448 | /* It is not a fragmented frame */ | |
b0e380b1 | 449 | skb->transport_header += sizeof(struct frag_hdr); |
1d015503 ED |
450 | __IP6_INC_STATS(net, |
451 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); | |
1da177e4 | 452 | |
d56f90a7 | 453 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
f46078cf | 454 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
1da177e4 LT |
455 | return 1; |
456 | } | |
457 | ||
648700f7 ED |
458 | iif = skb->dev ? skb->dev->ifindex : 0; |
459 | fq = fq_find(net, fhdr->identification, hdr, iif); | |
53b24b8f | 460 | if (fq) { |
415787d7 | 461 | u32 prob_offset = 0; |
f61944ef | 462 | int ret; |
1da177e4 | 463 | |
5ab11c98 | 464 | spin_lock(&fq->q.lock); |
1da177e4 | 465 | |
648700f7 | 466 | fq->iif = iif; |
415787d7 ED |
467 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff, |
468 | &prob_offset); | |
1da177e4 | 469 | |
5ab11c98 | 470 | spin_unlock(&fq->q.lock); |
093ba729 | 471 | inet_frag_put(&fq->q); |
415787d7 ED |
472 | if (prob_offset) { |
473 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), | |
474 | IPSTATS_MIB_INHDRERRORS); | |
475 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset); | |
476 | } | |
1da177e4 LT |
477 | return ret; |
478 | } | |
479 | ||
1d015503 | 480 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
1da177e4 LT |
481 | kfree_skb(skb); |
482 | return -1; | |
98b3377c DL |
483 | |
484 | fail_hdr: | |
bdb7cc64 | 485 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
1d015503 | 486 | IPSTATS_MIB_INHDRERRORS); |
98b3377c DL |
487 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
488 | return -1; | |
1da177e4 LT |
489 | } |
490 | ||
cc24beca | 491 | static const struct inet6_protocol frag_protocol = { |
1da177e4 LT |
492 | .handler = ipv6_frag_rcv, |
493 | .flags = INET6_PROTO_NOPOLICY, | |
494 | }; | |
495 | ||
8d8354d2 | 496 | #ifdef CONFIG_SYSCTL |
1bab4c75 | 497 | |
0a64b4b8 | 498 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
8d8354d2 | 499 | { |
8d8354d2 | 500 | .procname = "ip6frag_high_thresh", |
e31e0bdc | 501 | .data = &init_net.ipv6.frags.high_thresh, |
3e67f106 | 502 | .maxlen = sizeof(unsigned long), |
8d8354d2 | 503 | .mode = 0644, |
3e67f106 | 504 | .proc_handler = proc_doulongvec_minmax, |
1bab4c75 | 505 | .extra1 = &init_net.ipv6.frags.low_thresh |
8d8354d2 PE |
506 | }, |
507 | { | |
8d8354d2 | 508 | .procname = "ip6frag_low_thresh", |
e31e0bdc | 509 | .data = &init_net.ipv6.frags.low_thresh, |
3e67f106 | 510 | .maxlen = sizeof(unsigned long), |
8d8354d2 | 511 | .mode = 0644, |
6e00f7dd | 512 | .proc_handler = proc_doulongvec_minmax, |
1bab4c75 | 513 | .extra2 = &init_net.ipv6.frags.high_thresh |
8d8354d2 PE |
514 | }, |
515 | { | |
8d8354d2 | 516 | .procname = "ip6frag_time", |
b2fd5321 | 517 | .data = &init_net.ipv6.frags.timeout, |
8d8354d2 PE |
518 | .maxlen = sizeof(int), |
519 | .mode = 0644, | |
6d9f239a | 520 | .proc_handler = proc_dointvec_jiffies, |
8d8354d2 | 521 | }, |
7d291ebb PE |
522 | { } |
523 | }; | |
524 | ||
e3a57d18 FW |
525 | /* secret interval has been deprecated */ |
526 | static int ip6_frags_secret_interval_unused; | |
7d291ebb | 527 | static struct ctl_table ip6_frags_ctl_table[] = { |
8d8354d2 | 528 | { |
8d8354d2 | 529 | .procname = "ip6frag_secret_interval", |
e3a57d18 | 530 | .data = &ip6_frags_secret_interval_unused, |
8d8354d2 PE |
531 | .maxlen = sizeof(int), |
532 | .mode = 0644, | |
6d9f239a | 533 | .proc_handler = proc_dointvec_jiffies, |
8d8354d2 PE |
534 | }, |
535 | { } | |
536 | }; | |
537 | ||
2c8c1e72 | 538 | static int __net_init ip6_frags_ns_sysctl_register(struct net *net) |
8d8354d2 | 539 | { |
e4a2d5c2 | 540 | struct ctl_table *table; |
8d8354d2 PE |
541 | struct ctl_table_header *hdr; |
542 | ||
0a64b4b8 | 543 | table = ip6_frags_ns_ctl_table; |
09ad9bc7 | 544 | if (!net_eq(net, &init_net)) { |
0a64b4b8 | 545 | table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
63159f29 | 546 | if (!table) |
e4a2d5c2 PE |
547 | goto err_alloc; |
548 | ||
e31e0bdc | 549 | table[0].data = &net->ipv6.frags.high_thresh; |
1bab4c75 NA |
550 | table[0].extra1 = &net->ipv6.frags.low_thresh; |
551 | table[0].extra2 = &init_net.ipv6.frags.high_thresh; | |
e31e0bdc | 552 | table[1].data = &net->ipv6.frags.low_thresh; |
1bab4c75 | 553 | table[1].extra2 = &net->ipv6.frags.high_thresh; |
b2fd5321 | 554 | table[2].data = &net->ipv6.frags.timeout; |
e4a2d5c2 PE |
555 | } |
556 | ||
ec8f23ce | 557 | hdr = register_net_sysctl(net, "net/ipv6", table); |
63159f29 | 558 | if (!hdr) |
e4a2d5c2 PE |
559 | goto err_reg; |
560 | ||
561 | net->ipv6.sysctl.frags_hdr = hdr; | |
562 | return 0; | |
563 | ||
564 | err_reg: | |
09ad9bc7 | 565 | if (!net_eq(net, &init_net)) |
e4a2d5c2 PE |
566 | kfree(table); |
567 | err_alloc: | |
568 | return -ENOMEM; | |
569 | } | |
570 | ||
2c8c1e72 | 571 | static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net) |
e4a2d5c2 PE |
572 | { |
573 | struct ctl_table *table; | |
574 | ||
575 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; | |
576 | unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); | |
3705e11a YH |
577 | if (!net_eq(net, &init_net)) |
578 | kfree(table); | |
8d8354d2 | 579 | } |
7d291ebb PE |
580 | |
581 | static struct ctl_table_header *ip6_ctl_header; | |
582 | ||
583 | static int ip6_frags_sysctl_register(void) | |
584 | { | |
43444757 | 585 | ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6", |
7d291ebb PE |
586 | ip6_frags_ctl_table); |
587 | return ip6_ctl_header == NULL ? -ENOMEM : 0; | |
588 | } | |
589 | ||
590 | static void ip6_frags_sysctl_unregister(void) | |
591 | { | |
592 | unregister_net_sysctl_table(ip6_ctl_header); | |
593 | } | |
8d8354d2 | 594 | #else |
fc08c258 | 595 | static int ip6_frags_ns_sysctl_register(struct net *net) |
e71e0349 | 596 | { |
8d8354d2 PE |
597 | return 0; |
598 | } | |
e4a2d5c2 | 599 | |
fc08c258 | 600 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
e4a2d5c2 PE |
601 | { |
602 | } | |
7d291ebb | 603 | |
fc08c258 | 604 | static int ip6_frags_sysctl_register(void) |
7d291ebb PE |
605 | { |
606 | return 0; | |
607 | } | |
608 | ||
fc08c258 | 609 | static void ip6_frags_sysctl_unregister(void) |
7d291ebb PE |
610 | { |
611 | } | |
8d8354d2 | 612 | #endif |
7d460db9 | 613 | |
2c8c1e72 | 614 | static int __net_init ipv6_frags_init_net(struct net *net) |
8d8354d2 | 615 | { |
787bea77 ED |
616 | int res; |
617 | ||
7c070aa9 SW |
618 | net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
619 | net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH; | |
b2fd5321 | 620 | net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT; |
093ba729 | 621 | net->ipv6.frags.f = &ip6_frags; |
8d8354d2 | 622 | |
787bea77 ED |
623 | res = inet_frags_init_net(&net->ipv6.frags); |
624 | if (res < 0) | |
625 | return res; | |
5a63643e | 626 | |
787bea77 ED |
627 | res = ip6_frags_ns_sysctl_register(net); |
628 | if (res < 0) | |
093ba729 | 629 | inet_frags_exit_net(&net->ipv6.frags); |
787bea77 | 630 | return res; |
e71e0349 DL |
631 | } |
632 | ||
2c8c1e72 | 633 | static void __net_exit ipv6_frags_exit_net(struct net *net) |
81566e83 | 634 | { |
0a64b4b8 | 635 | ip6_frags_ns_sysctl_unregister(net); |
093ba729 | 636 | inet_frags_exit_net(&net->ipv6.frags); |
81566e83 PE |
637 | } |
638 | ||
639 | static struct pernet_operations ip6_frags_ops = { | |
640 | .init = ipv6_frags_init_net, | |
641 | .exit = ipv6_frags_exit_net, | |
642 | }; | |
643 | ||
70b095c8 | 644 | static const struct rhashtable_params ip6_rhash_params = { |
648700f7 | 645 | .head_offset = offsetof(struct inet_frag_queue, node), |
70b095c8 FW |
646 | .hashfn = ip6frag_key_hashfn, |
647 | .obj_hashfn = ip6frag_obj_hashfn, | |
648 | .obj_cmpfn = ip6frag_obj_cmpfn, | |
648700f7 ED |
649 | .automatic_shrinking = true, |
650 | }; | |
648700f7 | 651 | |
853cbbaa | 652 | int __init ipv6_frag_init(void) |
1da177e4 | 653 | { |
853cbbaa | 654 | int ret; |
1da177e4 | 655 | |
70b095c8 | 656 | ip6_frags.constructor = ip6frag_init; |
5b975bab ED |
657 | ip6_frags.destructor = NULL; |
658 | ip6_frags.qsize = sizeof(struct frag_queue); | |
5b975bab ED |
659 | ip6_frags.frag_expire = ip6_frag_expire; |
660 | ip6_frags.frags_cache_name = ip6_frag_cache_name; | |
648700f7 | 661 | ip6_frags.rhash_params = ip6_rhash_params; |
5b975bab | 662 | ret = inet_frags_init(&ip6_frags); |
853cbbaa DL |
663 | if (ret) |
664 | goto out; | |
e71e0349 | 665 | |
5b975bab ED |
666 | ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
667 | if (ret) | |
668 | goto err_protocol; | |
669 | ||
7d291ebb PE |
670 | ret = ip6_frags_sysctl_register(); |
671 | if (ret) | |
672 | goto err_sysctl; | |
673 | ||
0002c630 PE |
674 | ret = register_pernet_subsys(&ip6_frags_ops); |
675 | if (ret) | |
676 | goto err_pernet; | |
8d8354d2 | 677 | |
853cbbaa DL |
678 | out: |
679 | return ret; | |
0002c630 PE |
680 | |
681 | err_pernet: | |
7d291ebb PE |
682 | ip6_frags_sysctl_unregister(); |
683 | err_sysctl: | |
0002c630 | 684 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
5b975bab ED |
685 | err_protocol: |
686 | inet_frags_fini(&ip6_frags); | |
0002c630 | 687 | goto out; |
853cbbaa DL |
688 | } |
689 | ||
690 | void ipv6_frag_exit(void) | |
691 | { | |
692 | inet_frags_fini(&ip6_frags); | |
7d291ebb | 693 | ip6_frags_sysctl_unregister(); |
81566e83 | 694 | unregister_pernet_subsys(&ip6_frags_ops); |
853cbbaa | 695 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
1da177e4 | 696 | } |