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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 fragment reassembly
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090016/*
17 * Fixes:
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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 */
Hannes Frederic Sowa5a3da1f2013-03-15 11:32:30 +000029
30#define pr_fmt(fmt) "IPv6: " fmt
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#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>
Herbert Xuf61944e2007-10-15 01:28:47 -070046#include <linux/skbuff.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090047#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040048#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#include <net/sock.h>
51#include <net/snmp.h>
52
53#include <net/ipv6.h>
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090054#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#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>
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070060#include <net/inet_frag.h>
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +000061#include <net/inet_ecn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Nikolay Aleksandrovd4ad4d22014-08-01 12:29:48 +020063static const char ip6_frag_cache_name[] = "ip6-frags";
64
Ian Morriscc24bec2014-08-24 21:53:11 +010065struct ip6frag_skb_cb {
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 struct inet6_skb_parm h;
67 int offset;
68};
69
Ian Morris67ba4152014-08-24 21:53:10 +010070#define FRAG6_CB(skb) ((struct ip6frag_skb_cb *)((skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Fabian Frederickfc08c252014-10-29 11:38:17 +010072static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +000073{
74 return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
75}
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070077static struct inet_frags ip6_frags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Herbert Xuf61944e2007-10-15 01:28:47 -070079static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
80 struct net_device *dev);
81
Zach Brownf6596f92006-04-10 16:05:34 -070082/*
83 * callers should be careful not to use the hash value outside the ipfrag_lock
84 * as doing so could race with ipfrag_hash_rnd being recalculated.
85 */
Hannes Frederic Sowab1190572013-10-23 11:06:56 +020086static unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
87 const struct in6_addr *daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Hannes Frederic Sowab1190572013-10-23 11:06:56 +020089 net_get_random_once(&ip6_frags.rnd, sizeof(ip6_frags.rnd));
Florian Westphalfb3cfe62014-07-24 16:50:30 +020090 return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
91 (__force u32)id, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Florian Westphal36c77782014-07-24 16:50:29 +020094static unsigned int ip6_hashfn(const struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Florian Westphal36c77782014-07-24 16:50:29 +020096 const struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Pavel Emelyanov321a3a92007-10-15 02:38:08 -070098 fq = container_of(q, struct frag_queue, q);
Hannes Frederic Sowab1190572013-10-23 11:06:56 +020099 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Florian Westphal36c77782014-07-24 16:50:29 +0200102bool ip6_frag_match(const struct inet_frag_queue *q, const void *a)
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700103{
Florian Westphal36c77782014-07-24 16:50:29 +0200104 const struct frag_queue *fq;
105 const struct ip6_create_arg *arg = a;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700106
107 fq = container_of(q, struct frag_queue, q);
Eric Dumazetcbc264c2012-05-18 05:57:13 +0200108 return fq->id == arg->id &&
109 fq->user == arg->user &&
110 ipv6_addr_equal(&fq->saddr, arg->src) &&
111 ipv6_addr_equal(&fq->daddr, arg->dst);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700112}
113EXPORT_SYMBOL(ip6_frag_match);
114
Florian Westphal36c77782014-07-24 16:50:29 +0200115void ip6_frag_init(struct inet_frag_queue *q, const void *a)
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700116{
117 struct frag_queue *fq = container_of(q, struct frag_queue, q);
Florian Westphal36c77782014-07-24 16:50:29 +0200118 const struct ip6_create_arg *arg = a;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700119
120 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100121 fq->user = arg->user;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000122 fq->saddr = *arg->src;
123 fq->daddr = *arg->dst;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000124 fq->ecn = arg->ecn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700125}
126EXPORT_SYMBOL(ip6_frag_init);
127
Amerigo Wangb836c992012-09-18 16:50:09 +0000128void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
129 struct inet_frags *frags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900131 struct net_device *dev = NULL;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700132
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700133 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200135 if (fq->q.flags & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 goto out;
137
Amerigo Wangb836c992012-09-18 16:50:09 +0000138 inet_frag_kill(&fq->q, frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900140 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800141 dev = dev_get_by_index_rcu(net, fq->iif);
142 if (!dev)
143 goto out_rcu_unlock;
144
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700145 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Nikolay Aleksandrovcaaecdd2015-07-23 12:05:40 +0200147 if (inet_frag_evicting(&fq->q))
Nikolay Aleksandrov2e404f62014-08-01 12:29:47 +0200148 goto out_rcu_unlock;
149
150 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
151
Ingo Oeser78c784c2006-03-20 23:01:17 -0800152 /* Don't send error if the first segment did not arrive. */
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200153 if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800154 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Nikolay Aleksandrov2e404f62014-08-01 12:29:47 +0200156 /* But use as source device on which LAST ARRIVED
157 * segment was received. And do not use fq->dev
158 * pointer directly, device might already disappeared.
Ingo Oeser78c784c2006-03-20 23:01:17 -0800159 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700160 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000161 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800162out_rcu_unlock:
163 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700165 spin_unlock(&fq->q.lock);
Amerigo Wangb836c992012-09-18 16:50:09 +0000166 inet_frag_put(&fq->q, frags);
167}
168EXPORT_SYMBOL(ip6_expire_frag_queue);
169
170static void ip6_frag_expire(unsigned long data)
171{
172 struct frag_queue *fq;
173 struct net *net;
174
175 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
176 net = container_of(fq->q.net, struct net, ipv6.frags);
177
178 ip6_expire_frag_queue(net, fq, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Fabian Frederickfc08c252014-10-29 11:38:17 +0100181static struct frag_queue *
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000182fq_find(struct net *net, __be32 id, const struct in6_addr *src,
183 const struct in6_addr *dst, u8 ecn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700185 struct inet_frag_queue *q;
186 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700187 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700189 arg.id = id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100190 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700191 arg.src = src;
192 arg.dst = dst;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000193 arg.ecn = ecn;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700194
Hannes Frederic Sowab1190572013-10-23 11:06:56 +0200195 hash = inet6_hash_frag(id, src, dst);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700196
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800197 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Hannes Frederic Sowa5a3da1f2013-03-15 11:32:30 +0000198 if (IS_ERR_OR_NULL(q)) {
199 inet_frag_maybe_warn_overflow(q, pr_fmt());
Shan Wei95463772010-02-11 00:12:45 +0000200 return NULL;
Hannes Frederic Sowa5a3da1f2013-03-15 11:32:30 +0000201 }
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700202 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
204
Herbert Xuf61944e2007-10-15 01:28:47 -0700205static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 struct frag_hdr *fhdr, int nhoff)
207{
208 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700209 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000211 struct net *net = dev_net(skb_dst(skb)->dev);
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000212 u8 ecn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200214 if (fq->q.flags & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 goto err;
216
217 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700218 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
219 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221 if ((unsigned int)end > IPV6_MAXPLEN) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000222 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900223 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700224 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
225 ((u8 *)&fhdr->frag_off -
226 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700227 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
229
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000230 ecn = ip6_frag_ecn(ipv6_hdr(skb));
231
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700232 if (skb->ip_summed == CHECKSUM_COMPLETE) {
233 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900234 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700235 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
236 0));
237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 /* Is this the final fragment? */
240 if (!(fhdr->frag_off & htons(IP6_MF))) {
241 /* If we already have some bits beyond end
242 * or have different end, the segment is corrupted.
243 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700244 if (end < fq->q.len ||
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200245 ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 goto err;
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200247 fq->q.flags |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700248 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 } else {
250 /* Check if the fragment is rounded to 8 bytes.
251 * Required by the RFC.
252 */
253 if (end & 0x7) {
254 /* RFC2460 says always send parameter problem in
255 * this case. -DaveM
256 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000257 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900258 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900259 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700261 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700263 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 /* Some bits beyond end -> corruption. */
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200265 if (fq->q.flags & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700267 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
269 }
270
271 if (end == offset)
272 goto err;
273
274 /* Point into the IP datagram 'data' part. */
275 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
276 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900277
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700278 if (pskb_trim_rcsum(skb, end - offset))
279 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 /* Find out which fragments are in front and at the back of us
282 * in the chain of fragments so far. We must know where to put
283 * this fragment, right?
284 */
Changli Gaod6bebca2010-06-29 04:39:37 +0000285 prev = fq->q.fragments_tail;
286 if (!prev || FRAG6_CB(prev)->offset < offset) {
287 next = NULL;
288 goto found;
289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 prev = NULL;
Ian Morris67ba4152014-08-24 21:53:10 +0100291 for (next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (FRAG6_CB(next)->offset >= offset)
293 break; /* bingo! */
294 prev = next;
295 }
296
Changli Gaod6bebca2010-06-29 04:39:37 +0000297found:
Eric Dumazet5de658f2012-01-30 04:29:24 +0000298 /* RFC5722, Section 4, amended by Errata ID : 3089
299 * When reassembling an IPv6 datagram, if
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000300 * one or more its constituent fragments is determined to be an
301 * overlapping fragment, the entire datagram (and any constituent
Eric Dumazet5de658f2012-01-30 04:29:24 +0000302 * fragments) MUST be silently discarded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000305 /* Check for overlap with preceding fragment. */
306 if (prev &&
Shan Weif4642142010-11-05 01:56:34 +0000307 (FRAG6_CB(prev)->offset + prev->len) > offset)
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000308 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000310 /* Look for overlap with succeeding segment. */
311 if (next && FRAG6_CB(next)->offset < end)
312 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 FRAG6_CB(skb)->offset = offset;
315
316 /* Insert this fragment in the chain of fragments. */
317 skb->next = next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000318 if (!next)
319 fq->q.fragments_tail = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 if (prev)
321 prev->next = skb;
322 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700323 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Herbert Xuf61944e2007-10-15 01:28:47 -0700325 dev = skb->dev;
326 if (dev) {
327 fq->iif = dev->ifindex;
328 skb->dev = NULL;
329 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700330 fq->q.stamp = skb->tstamp;
331 fq->q.meat += skb->len;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000332 fq->ecn |= ecn;
Florian Westphal0e60d242015-07-23 12:05:38 +0200333 add_frag_mem_limit(fq->q.net, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 /* The first fragment.
336 * nhoffset is obtained from the first fragment, of course.
337 */
338 if (offset == 0) {
339 fq->nhoffset = nhoff;
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200340 fq->q.flags |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700342
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200343 if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
Eric Dumazet97599dc2013-04-16 12:55:41 +0000344 fq->q.meat == fq->q.len) {
345 int res;
346 unsigned long orefdst = skb->_skb_refdst;
Herbert Xuf61944e2007-10-15 01:28:47 -0700347
Eric Dumazet97599dc2013-04-16 12:55:41 +0000348 skb->_skb_refdst = 0UL;
349 res = ip6_frag_reasm(fq, prev, dev);
350 skb->_skb_refdst = orefdst;
351 return res;
352 }
353
354 skb_dst_drop(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700355 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000357discard_fq:
Amerigo Wangb836c992012-09-18 16:50:09 +0000358 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359err:
Nikolay Aleksandrovd2373862014-08-01 12:29:43 +0200360 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
361 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700363 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
366/*
367 * Check if this packet is complete.
368 * Returns NULL on failure by any reason, and pointer
369 * to current nexthdr field in reassembled frame.
370 *
371 * It is called with locked fq, and caller must check that
372 * queue is eligible for reassembly i.e. it is not COMPLETE,
373 * the last and the first frames arrived and all the bits are here.
374 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700375static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct net_device *dev)
377{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700378 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700379 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 int payload_len;
381 unsigned int nhoff;
Eric Dumazetec164392012-05-19 03:02:35 +0000382 int sum_truesize;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000383 u8 ecn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Amerigo Wangb836c992012-09-18 16:50:09 +0000385 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000387 ecn = ip_frag_ecn_table[fq->ecn];
388 if (unlikely(ecn == 0xff))
389 goto out_fail;
390
Herbert Xuf61944e2007-10-15 01:28:47 -0700391 /* Make the one we just received the head. */
392 if (prev) {
393 head = prev->next;
394 fp = skb_clone(head, GFP_ATOMIC);
395
396 if (!fp)
397 goto out_oom;
398
399 fp->next = head->next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000400 if (!fp->next)
401 fq->q.fragments_tail = fp;
Herbert Xuf61944e2007-10-15 01:28:47 -0700402 prev->next = fp;
403
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700404 skb_morph(head, fq->q.fragments);
405 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700406
Eric Dumazet808db802012-04-24 10:17:59 +0000407 consume_skb(fq->q.fragments);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700408 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700409 }
410
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700411 WARN_ON(head == NULL);
412 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700415 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700416 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700417 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 if (payload_len > IPV6_MAXPLEN)
419 goto out_oversize;
420
421 /* Head of list must not be cloned. */
Pravin B Shelar14bbd6a2013-02-14 09:44:49 +0000422 if (skb_unclone(head, GFP_ATOMIC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 goto out_oom;
424
425 /* If the first fragment is fragmented itself, we split
426 * it to two chunks: the first with data and paged part
427 * and the second, holding only fragments. */
David S. Miller21dc3302010-08-23 00:13:46 -0700428 if (skb_has_frag_list(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 struct sk_buff *clone;
430 int i, plen = 0;
431
Ian Morrise5d08d72014-11-23 21:28:43 +0000432 clone = alloc_skb(0, GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100433 if (!clone)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 goto out_oom;
435 clone->next = head->next;
436 head->next = clone;
437 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700438 skb_frag_list_init(head);
Eric Dumazet9e903e02011-10-18 21:00:24 +0000439 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
440 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 clone->len = clone->data_len = head->data_len - plen;
442 head->data_len -= clone->len;
443 head->len -= clone->len;
444 clone->csum = 0;
445 clone->ip_summed = head->ip_summed;
Florian Westphal0e60d242015-07-23 12:05:38 +0200446 add_frag_mem_limit(fq->q.net, clone->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 }
448
449 /* We have to remove fragment header from datagram and to relocate
450 * header in order to calculate ICV correctly. */
451 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700452 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900453 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700455 head->mac_header += sizeof(struct frag_hdr);
456 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300458 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700459 skb_push(head, head->data - skb_network_header(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Eric Dumazetec164392012-05-19 03:02:35 +0000461 sum_truesize = head->truesize;
462 for (fp = head->next; fp;) {
463 bool headstolen;
464 int delta;
465 struct sk_buff *next = fp->next;
466
467 sum_truesize += fp->truesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (head->ip_summed != fp->ip_summed)
469 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700470 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 head->csum = csum_add(head->csum, fp->csum);
Eric Dumazetec164392012-05-19 03:02:35 +0000472
473 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
474 kfree_skb_partial(fp, headstolen);
475 } else {
476 if (!skb_shinfo(head)->frag_list)
477 skb_shinfo(head)->frag_list = fp;
478 head->data_len += fp->len;
479 head->len += fp->len;
480 head->truesize += fp->truesize;
481 }
482 fp = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
Florian Westphal0e60d242015-07-23 12:05:38 +0200484 sub_frag_mem_limit(fq->q.net, sum_truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 head->next = NULL;
487 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700488 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700489 ipv6_hdr(head)->payload_len = htons(payload_len);
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000490 ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800491 IP6CB(head)->nhoff = nhoff;
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200492 IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700495 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700496 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300497 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700498 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900500 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700501 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900502 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700503 fq->q.fragments = NULL;
Changli Gaod6bebca2010-06-29 04:39:37 +0000504 fq->q.fragments_tail = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 return 1;
506
507out_oversize:
Joe Perchese87cc472012-05-13 21:56:26 +0000508 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 goto out_fail;
510out_oom:
Joe Perchese87cc472012-05-13 21:56:26 +0000511 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900513 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700514 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900515 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 return -1;
517}
518
Herbert Xue5bbef22007-10-15 12:50:28 -0700519static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 struct frag_hdr *fhdr;
522 struct frag_queue *fq;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000523 const struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000524 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200526 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
527 goto fail_hdr;
528
Eric Dumazetadf30902009-06-02 05:19:30 +0000529 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /* Jumbo payload inhibits frag. header */
Ian Morris67ba4152014-08-24 21:53:10 +0100532 if (hdr->payload_len == 0)
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700533 goto fail_hdr;
534
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700535 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700536 sizeof(struct frag_hdr))))
537 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700539 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700540 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 if (!(fhdr->frag_off & htons(0xFFF9))) {
543 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700544 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700545 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000546 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700548 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200549 IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 return 1;
551 }
552
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000553 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
554 ip6_frag_ecn(hdr));
Ian Morris53b24b82015-03-29 14:00:05 +0100555 if (fq) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700556 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700558 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Herbert Xuf61944e2007-10-15 01:28:47 -0700560 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700562 spin_unlock(&fq->q.lock);
Amerigo Wangb836c992012-09-18 16:50:09 +0000563 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 return ret;
565 }
566
Eric Dumazetadf30902009-06-02 05:19:30 +0000567 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 kfree_skb(skb);
569 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700570
571fail_hdr:
Nikolay Aleksandrovd2373862014-08-01 12:29:43 +0200572 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
573 IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700574 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
575 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576}
577
Ian Morriscc24bec2014-08-24 21:53:11 +0100578static const struct inet6_protocol frag_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 .handler = ipv6_frag_rcv,
580 .flags = INET6_PROTO_NOPOLICY,
581};
582
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800583#ifdef CONFIG_SYSCTL
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200584static int zero;
585
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700586static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800587 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800588 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800589 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800590 .maxlen = sizeof(int),
591 .mode = 0644,
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200592 .proc_handler = proc_dointvec_minmax,
593 .extra1 = &init_net.ipv6.frags.low_thresh
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800594 },
595 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800596 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800597 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800598 .maxlen = sizeof(int),
599 .mode = 0644,
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200600 .proc_handler = proc_dointvec_minmax,
601 .extra1 = &zero,
602 .extra2 = &init_net.ipv6.frags.high_thresh
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800603 },
604 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800605 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800606 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800607 .maxlen = sizeof(int),
608 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800609 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800610 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700611 { }
612};
613
Florian Westphale3a57d12014-07-24 16:50:35 +0200614/* secret interval has been deprecated */
615static int ip6_frags_secret_interval_unused;
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700616static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800617 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800618 .procname = "ip6frag_secret_interval",
Florian Westphale3a57d12014-07-24 16:50:35 +0200619 .data = &ip6_frags_secret_interval_unused,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800620 .maxlen = sizeof(int),
621 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800622 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800623 },
624 { }
625};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800626
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000627static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800628{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800629 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800630 struct ctl_table_header *hdr;
631
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700632 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800633 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700634 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100635 if (!table)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800636 goto err_alloc;
637
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800638 table[0].data = &net->ipv6.frags.high_thresh;
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200639 table[0].extra1 = &net->ipv6.frags.low_thresh;
640 table[0].extra2 = &init_net.ipv6.frags.high_thresh;
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800641 table[1].data = &net->ipv6.frags.low_thresh;
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200642 table[1].extra2 = &net->ipv6.frags.high_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800643 table[2].data = &net->ipv6.frags.timeout;
Eric W. Biederman464dc802012-11-16 03:02:59 +0000644
645 /* Don't export sysctls to unprivileged users */
646 if (net->user_ns != &init_user_ns)
647 table[0].procname = NULL;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800648 }
649
Eric W. Biedermanec8f23c2012-04-19 13:44:49 +0000650 hdr = register_net_sysctl(net, "net/ipv6", table);
Ian Morris63159f22015-03-29 14:00:04 +0100651 if (!hdr)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800652 goto err_reg;
653
654 net->ipv6.sysctl.frags_hdr = hdr;
655 return 0;
656
657err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800658 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800659 kfree(table);
660err_alloc:
661 return -ENOMEM;
662}
663
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000664static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800665{
666 struct ctl_table *table;
667
668 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
669 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800670 if (!net_eq(net, &init_net))
671 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800672}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700673
674static struct ctl_table_header *ip6_ctl_header;
675
676static int ip6_frags_sysctl_register(void)
677{
Eric W. Biederman43444752012-04-19 13:22:55 +0000678 ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700679 ip6_frags_ctl_table);
680 return ip6_ctl_header == NULL ? -ENOMEM : 0;
681}
682
683static void ip6_frags_sysctl_unregister(void)
684{
685 unregister_net_sysctl_table(ip6_ctl_header);
686}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800687#else
Fabian Frederickfc08c252014-10-29 11:38:17 +0100688static int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800689{
690 return 0;
691}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800692
Fabian Frederickfc08c252014-10-29 11:38:17 +0100693static void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800694{
695}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700696
Fabian Frederickfc08c252014-10-29 11:38:17 +0100697static int ip6_frags_sysctl_register(void)
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700698{
699 return 0;
700}
701
Fabian Frederickfc08c252014-10-29 11:38:17 +0100702static void ip6_frags_sysctl_unregister(void)
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700703{
704}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800705#endif
706
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000707static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800708{
Shan Wei7c070aa2010-01-20 10:42:41 +0100709 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
710 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800711 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800712
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800713 inet_frags_init_net(&net->ipv6.frags);
714
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700715 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800716}
717
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000718static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800719{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700720 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800721 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
722}
723
724static struct pernet_operations ip6_frags_ops = {
725 .init = ipv6_frags_init_net,
726 .exit = ipv6_frags_exit_net,
727};
728
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800729int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800731 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800733 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
734 if (ret)
735 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800736
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700737 ret = ip6_frags_sysctl_register();
738 if (ret)
739 goto err_sysctl;
740
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700741 ret = register_pernet_subsys(&ip6_frags_ops);
742 if (ret)
743 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800744
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700745 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700746 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700747 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700748 ip6_frags.skb_free = NULL;
749 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700750 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700751 ip6_frags.frag_expire = ip6_frag_expire;
Nikolay Aleksandrovd4ad4d22014-08-01 12:29:48 +0200752 ip6_frags.frags_cache_name = ip6_frag_cache_name;
753 ret = inet_frags_init(&ip6_frags);
754 if (ret)
755 goto err_pernet;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800756out:
757 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700758
759err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700760 ip6_frags_sysctl_unregister();
761err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700762 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
763 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800764}
765
766void ipv6_frag_exit(void)
767{
768 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700769 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800770 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800771 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}