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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 fragment reassembly | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: net/ipv4/ip_fragment.c |
1da177e4 LT |
10 | */ |
11 | ||
1ab1457c YH |
12 | /* |
13 | * Fixes: | |
1da177e4 LT |
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 | */ | |
5a3da1fe HFS |
25 | |
26 | #define pr_fmt(fmt) "IPv6: " fmt | |
27 | ||
1da177e4 LT |
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> | |
f61944ef | 42 | #include <linux/skbuff.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
bc3b2d7f | 44 | #include <linux/export.h> |
2efdaaaf HL |
45 | #include <linux/tcp.h> |
46 | #include <linux/udp.h> | |
1da177e4 LT |
47 | |
48 | #include <net/sock.h> | |
49 | #include <net/snmp.h> | |
50 | ||
51 | #include <net/ipv6.h> | |
a11d206d | 52 | #include <net/ip6_route.h> |
1da177e4 LT |
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> | |
70b095c8 | 58 | #include <net/ipv6_frag.h> |
eec2e618 | 59 | #include <net/inet_ecn.h> |
1da177e4 | 60 | |
d4ad4d22 NA |
61 | static const char ip6_frag_cache_name[] = "ip6-frags"; |
62 | ||
fc08c258 | 63 | static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) |
eec2e618 HFS |
64 | { |
65 | return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); | |
66 | } | |
1da177e4 | 67 | |
7eb95156 | 68 | static struct inet_frags ip6_frags; |
1da177e4 | 69 | |
d4289fcc PO |
70 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb, |
71 | struct sk_buff *prev_tail, struct net_device *dev); | |
f61944ef | 72 | |
78802011 | 73 | static void ip6_frag_expire(struct timer_list *t) |
b836c99f | 74 | { |
78802011 | 75 | struct inet_frag_queue *frag = from_timer(frag, t, timer); |
b836c99f | 76 | struct frag_queue *fq; |
b836c99f | 77 | |
78802011 | 78 | fq = container_of(frag, struct frag_queue, q); |
b836c99f | 79 | |
a39aca67 | 80 | ip6frag_expire_frag_queue(fq->q.fqdir->net, fq); |
1da177e4 LT |
81 | } |
82 | ||
fc08c258 | 83 | static struct frag_queue * |
648700f7 | 84 | fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif) |
1da177e4 | 85 | { |
648700f7 ED |
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 | }; | |
c6fda282 | 93 | struct inet_frag_queue *q; |
9a375803 | 94 | |
648700f7 ED |
95 | if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST | |
96 | IPV6_ADDR_LINKLOCAL))) | |
97 | key.iif = 0; | |
1da177e4 | 98 | |
4907abc6 | 99 | q = inet_frag_find(net->ipv6.fqdir, &key); |
2d44ed22 | 100 | if (!q) |
9546377c | 101 | return NULL; |
2d44ed22 | 102 | |
c6fda282 | 103 | return container_of(q, struct frag_queue, q); |
1da177e4 LT |
104 | } |
105 | ||
f61944ef | 106 | static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
415787d7 ED |
107 | struct frag_hdr *fhdr, int nhoff, |
108 | u32 *prob_offset) | |
1da177e4 | 109 | { |
adf30907 | 110 | struct net *net = dev_net(skb_dst(skb)->dev); |
d4289fcc PO |
111 | int offset, end, fragsize; |
112 | struct sk_buff *prev_tail; | |
113 | struct net_device *dev; | |
114 | int err = -ENOENT; | |
eec2e618 | 115 | u8 ecn; |
1da177e4 | 116 | |
06aa8b8a | 117 | if (fq->q.flags & INET_FRAG_COMPLETE) |
1da177e4 LT |
118 | goto err; |
119 | ||
d4289fcc | 120 | err = -EINVAL; |
1da177e4 | 121 | offset = ntohs(fhdr->frag_off) & ~0x7; |
0660e03f ACM |
122 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
123 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); | |
1da177e4 LT |
124 | |
125 | if ((unsigned int)end > IPV6_MAXPLEN) { | |
415787d7 | 126 | *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb); |
d4289fcc PO |
127 | /* note that if prob_offset is set, the skb is freed elsewhere, |
128 | * we do not free it here. | |
129 | */ | |
f61944ef | 130 | return -1; |
1da177e4 LT |
131 | } |
132 | ||
eec2e618 HFS |
133 | ecn = ip6_frag_ecn(ipv6_hdr(skb)); |
134 | ||
d56f90a7 ACM |
135 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
136 | const unsigned char *nh = skb_network_header(skb); | |
1ab1457c | 137 | skb->csum = csum_sub(skb->csum, |
d56f90a7 ACM |
138 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
139 | 0)); | |
140 | } | |
1da177e4 LT |
141 | |
142 | /* Is this the final fragment? */ | |
143 | if (!(fhdr->frag_off & htons(IP6_MF))) { | |
144 | /* If we already have some bits beyond end | |
145 | * or have different end, the segment is corrupted. | |
146 | */ | |
5ab11c98 | 147 | if (end < fq->q.len || |
06aa8b8a | 148 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
2475f59c | 149 | goto discard_fq; |
06aa8b8a | 150 | fq->q.flags |= INET_FRAG_LAST_IN; |
5ab11c98 | 151 | fq->q.len = end; |
1da177e4 LT |
152 | } else { |
153 | /* Check if the fragment is rounded to 8 bytes. | |
154 | * Required by the RFC. | |
155 | */ | |
156 | if (end & 0x7) { | |
157 | /* RFC2460 says always send parameter problem in | |
158 | * this case. -DaveM | |
159 | */ | |
415787d7 | 160 | *prob_offset = offsetof(struct ipv6hdr, payload_len); |
f61944ef | 161 | return -1; |
1da177e4 | 162 | } |
5ab11c98 | 163 | if (end > fq->q.len) { |
1da177e4 | 164 | /* Some bits beyond end -> corruption. */ |
06aa8b8a | 165 | if (fq->q.flags & INET_FRAG_LAST_IN) |
2475f59c | 166 | goto discard_fq; |
5ab11c98 | 167 | fq->q.len = end; |
1da177e4 LT |
168 | } |
169 | } | |
170 | ||
171 | if (end == offset) | |
2475f59c | 172 | goto discard_fq; |
1da177e4 | 173 | |
d4289fcc | 174 | err = -ENOMEM; |
1da177e4 LT |
175 | /* Point into the IP datagram 'data' part. */ |
176 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) | |
2475f59c | 177 | goto discard_fq; |
1ab1457c | 178 | |
d4289fcc PO |
179 | err = pskb_trim_rcsum(skb, end - offset); |
180 | if (err) | |
70789d70 | 181 | goto discard_fq; |
1da177e4 | 182 | |
d4289fcc | 183 | /* Note : skb->rbnode and skb->dev share the same location. */ |
219badfa | 184 | dev = skb->dev; |
219badfa ED |
185 | /* Makes sure compiler wont do silly aliasing games */ |
186 | barrier(); | |
1da177e4 | 187 | |
d4289fcc PO |
188 | prev_tail = fq->q.fragments_tail; |
189 | err = inet_frag_queue_insert(&fq->q, skb, offset, end); | |
190 | if (err) | |
191 | goto insert_error; | |
192 | ||
193 | if (dev) | |
194 | fq->iif = dev->ifindex; | |
1da177e4 | 195 | |
5ab11c98 PE |
196 | fq->q.stamp = skb->tstamp; |
197 | fq->q.meat += skb->len; | |
eec2e618 | 198 | fq->ecn |= ecn; |
6ce3b4dc | 199 | add_frag_mem_limit(fq->q.fqdir, skb->truesize); |
1da177e4 | 200 | |
dbd1759e WB |
201 | fragsize = -skb_network_offset(skb) + skb->len; |
202 | if (fragsize > fq->q.max_size) | |
203 | fq->q.max_size = fragsize; | |
204 | ||
1da177e4 LT |
205 | /* The first fragment. |
206 | * nhoffset is obtained from the first fragment, of course. | |
207 | */ | |
208 | if (offset == 0) { | |
209 | fq->nhoffset = nhoff; | |
06aa8b8a | 210 | fq->q.flags |= INET_FRAG_FIRST_IN; |
1da177e4 | 211 | } |
f61944ef | 212 | |
06aa8b8a | 213 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
97599dc7 | 214 | fq->q.meat == fq->q.len) { |
97599dc7 ED |
215 | unsigned long orefdst = skb->_skb_refdst; |
216 | ||
217 | skb->_skb_refdst = 0UL; | |
d4289fcc | 218 | err = ip6_frag_reasm(fq, skb, prev_tail, dev); |
97599dc7 | 219 | skb->_skb_refdst = orefdst; |
d4289fcc | 220 | return err; |
97599dc7 | 221 | } |
f61944ef | 222 | |
97599dc7 | 223 | skb_dst_drop(skb); |
d4289fcc | 224 | return -EINPROGRESS; |
1da177e4 | 225 | |
d4289fcc PO |
226 | insert_error: |
227 | if (err == IPFRAG_DUP) { | |
228 | kfree_skb(skb); | |
229 | return -EINVAL; | |
230 | } | |
231 | err = -EINVAL; | |
232 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
233 | IPSTATS_MIB_REASM_OVERLAPS); | |
70789d70 | 234 | discard_fq: |
093ba729 | 235 | inet_frag_kill(&fq->q); |
1d015503 ED |
236 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
237 | IPSTATS_MIB_REASMFAILS); | |
d4289fcc | 238 | err: |
1da177e4 | 239 | kfree_skb(skb); |
d4289fcc | 240 | return err; |
1da177e4 LT |
241 | } |
242 | ||
243 | /* | |
244 | * Check if this packet is complete. | |
1da177e4 LT |
245 | * |
246 | * It is called with locked fq, and caller must check that | |
247 | * queue is eligible for reassembly i.e. it is not COMPLETE, | |
248 | * the last and the first frames arrived and all the bits are here. | |
249 | */ | |
d4289fcc PO |
250 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb, |
251 | struct sk_buff *prev_tail, struct net_device *dev) | |
1da177e4 | 252 | { |
a39aca67 | 253 | struct net *net = fq->q.fqdir->net; |
1da177e4 | 254 | unsigned int nhoff; |
d4289fcc PO |
255 | void *reasm_data; |
256 | int payload_len; | |
eec2e618 | 257 | u8 ecn; |
1da177e4 | 258 | |
093ba729 | 259 | inet_frag_kill(&fq->q); |
1da177e4 | 260 | |
eec2e618 HFS |
261 | ecn = ip_frag_ecn_table[fq->ecn]; |
262 | if (unlikely(ecn == 0xff)) | |
263 | goto out_fail; | |
264 | ||
d4289fcc PO |
265 | reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail); |
266 | if (!reasm_data) | |
267 | goto out_oom; | |
1da177e4 | 268 | |
d4289fcc | 269 | payload_len = ((skb->data - skb_network_header(skb)) - |
5ab11c98 | 270 | sizeof(struct ipv6hdr) + fq->q.len - |
d56f90a7 | 271 | sizeof(struct frag_hdr)); |
1da177e4 LT |
272 | if (payload_len > IPV6_MAXPLEN) |
273 | goto out_oversize; | |
274 | ||
1da177e4 LT |
275 | /* We have to remove fragment header from datagram and to relocate |
276 | * header in order to calculate ICV correctly. */ | |
277 | nhoff = fq->nhoffset; | |
d4289fcc PO |
278 | skb_network_header(skb)[nhoff] = skb_transport_header(skb)[0]; |
279 | memmove(skb->head + sizeof(struct frag_hdr), skb->head, | |
280 | (skb->data - skb->head) - sizeof(struct frag_hdr)); | |
281 | if (skb_mac_header_was_set(skb)) | |
282 | skb->mac_header += sizeof(struct frag_hdr); | |
283 | skb->network_header += sizeof(struct frag_hdr); | |
284 | ||
285 | skb_reset_transport_header(skb); | |
286 | ||
891584f4 | 287 | inet_frag_reasm_finish(&fq->q, skb, reasm_data, true); |
1da177e4 | 288 | |
d4289fcc PO |
289 | skb->dev = dev; |
290 | ipv6_hdr(skb)->payload_len = htons(payload_len); | |
291 | ipv6_change_dsfield(ipv6_hdr(skb), 0xff, ecn); | |
292 | IP6CB(skb)->nhoff = nhoff; | |
293 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; | |
294 | IP6CB(skb)->frag_max_size = fq->q.max_size; | |
1da177e4 | 295 | |
1da177e4 | 296 | /* Yes, and fold redundant checksum back. 8) */ |
d4289fcc PO |
297 | skb_postpush_rcsum(skb, skb_network_header(skb), |
298 | skb_network_header_len(skb)); | |
1da177e4 | 299 | |
a11d206d | 300 | rcu_read_lock(); |
e1ae5c2e | 301 | __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMOKS); |
a11d206d | 302 | rcu_read_unlock(); |
fa0f5273 | 303 | fq->q.rb_fragments = RB_ROOT; |
d6bebca9 | 304 | fq->q.fragments_tail = NULL; |
d4289fcc | 305 | fq->q.last_run_head = NULL; |
1da177e4 LT |
306 | return 1; |
307 | ||
308 | out_oversize: | |
e87cc472 | 309 | net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len); |
1da177e4 LT |
310 | goto out_fail; |
311 | out_oom: | |
e87cc472 | 312 | net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n"); |
1da177e4 | 313 | out_fail: |
a11d206d | 314 | rcu_read_lock(); |
e1ae5c2e | 315 | __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMFAILS); |
a11d206d | 316 | rcu_read_unlock(); |
2475f59c | 317 | inet_frag_kill(&fq->q); |
1da177e4 LT |
318 | return -1; |
319 | } | |
320 | ||
e5bbef20 | 321 | static int ipv6_frag_rcv(struct sk_buff *skb) |
1da177e4 | 322 | { |
1da177e4 LT |
323 | struct frag_hdr *fhdr; |
324 | struct frag_queue *fq; | |
b71d1d42 | 325 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
adf30907 | 326 | struct net *net = dev_net(skb_dst(skb)->dev); |
2efdaaaf | 327 | u8 nexthdr; |
9d9e937b | 328 | int iif; |
1da177e4 | 329 | |
f46078cf HFS |
330 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED) |
331 | goto fail_hdr; | |
332 | ||
1d015503 | 333 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
1da177e4 LT |
334 | |
335 | /* Jumbo payload inhibits frag. header */ | |
67ba4152 | 336 | if (hdr->payload_len == 0) |
98b3377c DL |
337 | goto fail_hdr; |
338 | ||
ea2ae17d | 339 | if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
98b3377c DL |
340 | sizeof(struct frag_hdr)))) |
341 | goto fail_hdr; | |
1da177e4 | 342 | |
0660e03f | 343 | hdr = ipv6_hdr(skb); |
9c70220b | 344 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
1da177e4 | 345 | |
e29f011e | 346 | if (!(fhdr->frag_off & htons(IP6_OFFSET | IP6_MF))) { |
1da177e4 | 347 | /* It is not a fragmented frame */ |
b0e380b1 | 348 | skb->transport_header += sizeof(struct frag_hdr); |
1d015503 ED |
349 | __IP6_INC_STATS(net, |
350 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); | |
1da177e4 | 351 | |
d56f90a7 | 352 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
f46078cf | 353 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
e29f011e FR |
354 | IP6CB(skb)->frag_max_size = ntohs(hdr->payload_len) + |
355 | sizeof(struct ipv6hdr); | |
1da177e4 LT |
356 | return 1; |
357 | } | |
358 | ||
2efdaaaf HL |
359 | /* RFC 8200, Section 4.5 Fragment Header: |
360 | * If the first fragment does not include all headers through an | |
361 | * Upper-Layer header, then that fragment should be discarded and | |
362 | * an ICMP Parameter Problem, Code 3, message should be sent to | |
363 | * the source of the fragment, with the Pointer field set to zero. | |
364 | */ | |
365 | nexthdr = hdr->nexthdr; | |
2d8f6481 | 366 | if (ipv6frag_thdr_truncated(skb, skb_transport_offset(skb), &nexthdr)) { |
9d9e937b GK |
367 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
368 | IPSTATS_MIB_INHDRERRORS); | |
369 | icmpv6_param_prob(skb, ICMPV6_HDR_INCOMP, 0); | |
370 | return -1; | |
2efdaaaf HL |
371 | } |
372 | ||
648700f7 ED |
373 | iif = skb->dev ? skb->dev->ifindex : 0; |
374 | fq = fq_find(net, fhdr->identification, hdr, iif); | |
53b24b8f | 375 | if (fq) { |
415787d7 | 376 | u32 prob_offset = 0; |
f61944ef | 377 | int ret; |
1da177e4 | 378 | |
5ab11c98 | 379 | spin_lock(&fq->q.lock); |
1da177e4 | 380 | |
648700f7 | 381 | fq->iif = iif; |
415787d7 ED |
382 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff, |
383 | &prob_offset); | |
1da177e4 | 384 | |
5ab11c98 | 385 | spin_unlock(&fq->q.lock); |
093ba729 | 386 | inet_frag_put(&fq->q); |
415787d7 ED |
387 | if (prob_offset) { |
388 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), | |
389 | IPSTATS_MIB_INHDRERRORS); | |
d4289fcc | 390 | /* icmpv6_param_prob() calls kfree_skb(skb) */ |
415787d7 ED |
391 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset); |
392 | } | |
1da177e4 LT |
393 | return ret; |
394 | } | |
395 | ||
1d015503 | 396 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
1da177e4 LT |
397 | kfree_skb(skb); |
398 | return -1; | |
98b3377c DL |
399 | |
400 | fail_hdr: | |
bdb7cc64 | 401 | __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev), |
1d015503 | 402 | IPSTATS_MIB_INHDRERRORS); |
98b3377c DL |
403 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
404 | return -1; | |
1da177e4 LT |
405 | } |
406 | ||
cc24beca | 407 | static const struct inet6_protocol frag_protocol = { |
1da177e4 LT |
408 | .handler = ipv6_frag_rcv, |
409 | .flags = INET6_PROTO_NOPOLICY, | |
410 | }; | |
411 | ||
8d8354d2 | 412 | #ifdef CONFIG_SYSCTL |
1bab4c75 | 413 | |
0a64b4b8 | 414 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
8d8354d2 | 415 | { |
8d8354d2 | 416 | .procname = "ip6frag_high_thresh", |
3e67f106 | 417 | .maxlen = sizeof(unsigned long), |
8d8354d2 | 418 | .mode = 0644, |
3e67f106 | 419 | .proc_handler = proc_doulongvec_minmax, |
8d8354d2 PE |
420 | }, |
421 | { | |
8d8354d2 | 422 | .procname = "ip6frag_low_thresh", |
3e67f106 | 423 | .maxlen = sizeof(unsigned long), |
8d8354d2 | 424 | .mode = 0644, |
6e00f7dd | 425 | .proc_handler = proc_doulongvec_minmax, |
8d8354d2 PE |
426 | }, |
427 | { | |
8d8354d2 | 428 | .procname = "ip6frag_time", |
8d8354d2 PE |
429 | .maxlen = sizeof(int), |
430 | .mode = 0644, | |
6d9f239a | 431 | .proc_handler = proc_dointvec_jiffies, |
8d8354d2 | 432 | }, |
7d291ebb PE |
433 | { } |
434 | }; | |
435 | ||
e3a57d18 FW |
436 | /* secret interval has been deprecated */ |
437 | static int ip6_frags_secret_interval_unused; | |
7d291ebb | 438 | static struct ctl_table ip6_frags_ctl_table[] = { |
8d8354d2 | 439 | { |
8d8354d2 | 440 | .procname = "ip6frag_secret_interval", |
e3a57d18 | 441 | .data = &ip6_frags_secret_interval_unused, |
8d8354d2 PE |
442 | .maxlen = sizeof(int), |
443 | .mode = 0644, | |
6d9f239a | 444 | .proc_handler = proc_dointvec_jiffies, |
8d8354d2 PE |
445 | }, |
446 | { } | |
447 | }; | |
448 | ||
2c8c1e72 | 449 | static int __net_init ip6_frags_ns_sysctl_register(struct net *net) |
8d8354d2 | 450 | { |
e4a2d5c2 | 451 | struct ctl_table *table; |
8d8354d2 PE |
452 | struct ctl_table_header *hdr; |
453 | ||
0a64b4b8 | 454 | table = ip6_frags_ns_ctl_table; |
09ad9bc7 | 455 | if (!net_eq(net, &init_net)) { |
0a64b4b8 | 456 | table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
63159f29 | 457 | if (!table) |
e4a2d5c2 PE |
458 | goto err_alloc; |
459 | ||
e4a2d5c2 | 460 | } |
4907abc6 ED |
461 | table[0].data = &net->ipv6.fqdir->high_thresh; |
462 | table[0].extra1 = &net->ipv6.fqdir->low_thresh; | |
463 | table[1].data = &net->ipv6.fqdir->low_thresh; | |
464 | table[1].extra2 = &net->ipv6.fqdir->high_thresh; | |
465 | table[2].data = &net->ipv6.fqdir->timeout; | |
e4a2d5c2 | 466 | |
ec8f23ce | 467 | hdr = register_net_sysctl(net, "net/ipv6", table); |
63159f29 | 468 | if (!hdr) |
e4a2d5c2 PE |
469 | goto err_reg; |
470 | ||
471 | net->ipv6.sysctl.frags_hdr = hdr; | |
472 | return 0; | |
473 | ||
474 | err_reg: | |
09ad9bc7 | 475 | if (!net_eq(net, &init_net)) |
e4a2d5c2 PE |
476 | kfree(table); |
477 | err_alloc: | |
478 | return -ENOMEM; | |
479 | } | |
480 | ||
2c8c1e72 | 481 | static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net) |
e4a2d5c2 PE |
482 | { |
483 | struct ctl_table *table; | |
484 | ||
485 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; | |
486 | unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); | |
3705e11a YH |
487 | if (!net_eq(net, &init_net)) |
488 | kfree(table); | |
8d8354d2 | 489 | } |
7d291ebb PE |
490 | |
491 | static struct ctl_table_header *ip6_ctl_header; | |
492 | ||
493 | static int ip6_frags_sysctl_register(void) | |
494 | { | |
43444757 | 495 | ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6", |
7d291ebb PE |
496 | ip6_frags_ctl_table); |
497 | return ip6_ctl_header == NULL ? -ENOMEM : 0; | |
498 | } | |
499 | ||
500 | static void ip6_frags_sysctl_unregister(void) | |
501 | { | |
502 | unregister_net_sysctl_table(ip6_ctl_header); | |
503 | } | |
8d8354d2 | 504 | #else |
fc08c258 | 505 | static int ip6_frags_ns_sysctl_register(struct net *net) |
e71e0349 | 506 | { |
8d8354d2 PE |
507 | return 0; |
508 | } | |
e4a2d5c2 | 509 | |
fc08c258 | 510 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
e4a2d5c2 PE |
511 | { |
512 | } | |
7d291ebb | 513 | |
fc08c258 | 514 | static int ip6_frags_sysctl_register(void) |
7d291ebb PE |
515 | { |
516 | return 0; | |
517 | } | |
518 | ||
fc08c258 | 519 | static void ip6_frags_sysctl_unregister(void) |
7d291ebb PE |
520 | { |
521 | } | |
8d8354d2 | 522 | #endif |
7d460db9 | 523 | |
2c8c1e72 | 524 | static int __net_init ipv6_frags_init_net(struct net *net) |
8d8354d2 | 525 | { |
787bea77 ED |
526 | int res; |
527 | ||
a39aca67 | 528 | res = fqdir_init(&net->ipv6.fqdir, &ip6_frags, net); |
787bea77 ED |
529 | if (res < 0) |
530 | return res; | |
5a63643e | 531 | |
4907abc6 ED |
532 | net->ipv6.fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH; |
533 | net->ipv6.fqdir->low_thresh = IPV6_FRAG_LOW_THRESH; | |
534 | net->ipv6.fqdir->timeout = IPV6_FRAG_TIMEOUT; | |
535 | ||
787bea77 ED |
536 | res = ip6_frags_ns_sysctl_register(net); |
537 | if (res < 0) | |
4907abc6 | 538 | fqdir_exit(net->ipv6.fqdir); |
787bea77 | 539 | return res; |
e71e0349 DL |
540 | } |
541 | ||
d5dd8879 ED |
542 | static void __net_exit ipv6_frags_pre_exit_net(struct net *net) |
543 | { | |
544 | fqdir_pre_exit(net->ipv6.fqdir); | |
545 | } | |
546 | ||
2c8c1e72 | 547 | static void __net_exit ipv6_frags_exit_net(struct net *net) |
81566e83 | 548 | { |
0a64b4b8 | 549 | ip6_frags_ns_sysctl_unregister(net); |
4907abc6 | 550 | fqdir_exit(net->ipv6.fqdir); |
81566e83 PE |
551 | } |
552 | ||
553 | static struct pernet_operations ip6_frags_ops = { | |
d5dd8879 ED |
554 | .init = ipv6_frags_init_net, |
555 | .pre_exit = ipv6_frags_pre_exit_net, | |
556 | .exit = ipv6_frags_exit_net, | |
81566e83 PE |
557 | }; |
558 | ||
70b095c8 | 559 | static const struct rhashtable_params ip6_rhash_params = { |
648700f7 | 560 | .head_offset = offsetof(struct inet_frag_queue, node), |
70b095c8 FW |
561 | .hashfn = ip6frag_key_hashfn, |
562 | .obj_hashfn = ip6frag_obj_hashfn, | |
563 | .obj_cmpfn = ip6frag_obj_cmpfn, | |
648700f7 ED |
564 | .automatic_shrinking = true, |
565 | }; | |
648700f7 | 566 | |
853cbbaa | 567 | int __init ipv6_frag_init(void) |
1da177e4 | 568 | { |
853cbbaa | 569 | int ret; |
1da177e4 | 570 | |
70b095c8 | 571 | ip6_frags.constructor = ip6frag_init; |
5b975bab ED |
572 | ip6_frags.destructor = NULL; |
573 | ip6_frags.qsize = sizeof(struct frag_queue); | |
5b975bab ED |
574 | ip6_frags.frag_expire = ip6_frag_expire; |
575 | ip6_frags.frags_cache_name = ip6_frag_cache_name; | |
648700f7 | 576 | ip6_frags.rhash_params = ip6_rhash_params; |
5b975bab | 577 | ret = inet_frags_init(&ip6_frags); |
853cbbaa DL |
578 | if (ret) |
579 | goto out; | |
e71e0349 | 580 | |
5b975bab ED |
581 | ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
582 | if (ret) | |
583 | goto err_protocol; | |
584 | ||
7d291ebb PE |
585 | ret = ip6_frags_sysctl_register(); |
586 | if (ret) | |
587 | goto err_sysctl; | |
588 | ||
0002c630 PE |
589 | ret = register_pernet_subsys(&ip6_frags_ops); |
590 | if (ret) | |
591 | goto err_pernet; | |
8d8354d2 | 592 | |
853cbbaa DL |
593 | out: |
594 | return ret; | |
0002c630 PE |
595 | |
596 | err_pernet: | |
7d291ebb PE |
597 | ip6_frags_sysctl_unregister(); |
598 | err_sysctl: | |
0002c630 | 599 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
5b975bab ED |
600 | err_protocol: |
601 | inet_frags_fini(&ip6_frags); | |
0002c630 | 602 | goto out; |
853cbbaa DL |
603 | } |
604 | ||
605 | void ipv6_frag_exit(void) | |
606 | { | |
7d291ebb | 607 | ip6_frags_sysctl_unregister(); |
81566e83 | 608 | unregister_pernet_subsys(&ip6_frags_ops); |
853cbbaa | 609 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
ae7352d3 | 610 | inet_frags_fini(&ip6_frags); |
1da177e4 | 611 | } |