blob: 18f3498a6c80564d897a2f659a7747827d19a667 [file] [log] [blame]
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) &&
Michal Kubeček264640f2015-11-24 15:07:11 +0100111 ipv6_addr_equal(&fq->daddr, arg->dst) &&
112 (arg->iif == fq->iif ||
113 !(ipv6_addr_type(arg->dst) & (IPV6_ADDR_MULTICAST |
114 IPV6_ADDR_LINKLOCAL)));
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700115}
116EXPORT_SYMBOL(ip6_frag_match);
117
Florian Westphal36c77782014-07-24 16:50:29 +0200118void ip6_frag_init(struct inet_frag_queue *q, const void *a)
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700119{
120 struct frag_queue *fq = container_of(q, struct frag_queue, q);
Florian Westphal36c77782014-07-24 16:50:29 +0200121 const struct ip6_create_arg *arg = a;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700122
123 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100124 fq->user = arg->user;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000125 fq->saddr = *arg->src;
126 fq->daddr = *arg->dst;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000127 fq->ecn = arg->ecn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700128}
129EXPORT_SYMBOL(ip6_frag_init);
130
Amerigo Wangb836c992012-09-18 16:50:09 +0000131void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
132 struct inet_frags *frags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900134 struct net_device *dev = NULL;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700135
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700136 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200138 if (fq->q.flags & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 goto out;
140
Amerigo Wangb836c992012-09-18 16:50:09 +0000141 inet_frag_kill(&fq->q, frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900143 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800144 dev = dev_get_by_index_rcu(net, fq->iif);
145 if (!dev)
146 goto out_rcu_unlock;
147
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700148 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Nikolay Aleksandrovcaaecdd2015-07-23 12:05:40 +0200150 if (inet_frag_evicting(&fq->q))
Nikolay Aleksandrov2e404f62014-08-01 12:29:47 +0200151 goto out_rcu_unlock;
152
153 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
154
Ingo Oeser78c784c2006-03-20 23:01:17 -0800155 /* Don't send error if the first segment did not arrive. */
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200156 if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800157 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Nikolay Aleksandrov2e404f62014-08-01 12:29:47 +0200159 /* But use as source device on which LAST ARRIVED
160 * segment was received. And do not use fq->dev
161 * pointer directly, device might already disappeared.
Ingo Oeser78c784c2006-03-20 23:01:17 -0800162 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700163 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000164 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800165out_rcu_unlock:
166 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700168 spin_unlock(&fq->q.lock);
Amerigo Wangb836c992012-09-18 16:50:09 +0000169 inet_frag_put(&fq->q, frags);
170}
171EXPORT_SYMBOL(ip6_expire_frag_queue);
172
173static void ip6_frag_expire(unsigned long data)
174{
175 struct frag_queue *fq;
176 struct net *net;
177
178 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
179 net = container_of(fq->q.net, struct net, ipv6.frags);
180
181 ip6_expire_frag_queue(net, fq, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
Fabian Frederickfc08c252014-10-29 11:38:17 +0100184static struct frag_queue *
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000185fq_find(struct net *net, __be32 id, const struct in6_addr *src,
Michal Kubeček264640f2015-11-24 15:07:11 +0100186 const struct in6_addr *dst, int iif, u8 ecn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700188 struct inet_frag_queue *q;
189 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700190 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700192 arg.id = id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100193 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700194 arg.src = src;
195 arg.dst = dst;
Michal Kubeček264640f2015-11-24 15:07:11 +0100196 arg.iif = iif;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000197 arg.ecn = ecn;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700198
Hannes Frederic Sowab1190572013-10-23 11:06:56 +0200199 hash = inet6_hash_frag(id, src, dst);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700200
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800201 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Hannes Frederic Sowa5a3da1f2013-03-15 11:32:30 +0000202 if (IS_ERR_OR_NULL(q)) {
203 inet_frag_maybe_warn_overflow(q, pr_fmt());
Shan Wei95463772010-02-11 00:12:45 +0000204 return NULL;
Hannes Frederic Sowa5a3da1f2013-03-15 11:32:30 +0000205 }
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700206 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
Herbert Xuf61944e2007-10-15 01:28:47 -0700209static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 struct frag_hdr *fhdr, int nhoff)
211{
212 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700213 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000215 struct net *net = dev_net(skb_dst(skb)->dev);
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000216 u8 ecn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200218 if (fq->q.flags & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 goto err;
220
221 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700222 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
223 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 if ((unsigned int)end > IPV6_MAXPLEN) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000226 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900227 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700228 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
229 ((u8 *)&fhdr->frag_off -
230 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700231 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
233
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000234 ecn = ip6_frag_ecn(ipv6_hdr(skb));
235
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700236 if (skb->ip_summed == CHECKSUM_COMPLETE) {
237 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900238 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700239 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
240 0));
241 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 /* Is this the final fragment? */
244 if (!(fhdr->frag_off & htons(IP6_MF))) {
245 /* If we already have some bits beyond end
246 * or have different end, the segment is corrupted.
247 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700248 if (end < fq->q.len ||
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200249 ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 goto err;
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200251 fq->q.flags |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700252 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 } else {
254 /* Check if the fragment is rounded to 8 bytes.
255 * Required by the RFC.
256 */
257 if (end & 0x7) {
258 /* RFC2460 says always send parameter problem in
259 * this case. -DaveM
260 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000261 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900262 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900263 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700265 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700267 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 /* Some bits beyond end -> corruption. */
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200269 if (fq->q.flags & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700271 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 }
274
275 if (end == offset)
276 goto err;
277
278 /* Point into the IP datagram 'data' part. */
279 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
280 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900281
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700282 if (pskb_trim_rcsum(skb, end - offset))
283 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 /* Find out which fragments are in front and at the back of us
286 * in the chain of fragments so far. We must know where to put
287 * this fragment, right?
288 */
Changli Gaod6bebca2010-06-29 04:39:37 +0000289 prev = fq->q.fragments_tail;
290 if (!prev || FRAG6_CB(prev)->offset < offset) {
291 next = NULL;
292 goto found;
293 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 prev = NULL;
Ian Morris67ba4152014-08-24 21:53:10 +0100295 for (next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 if (FRAG6_CB(next)->offset >= offset)
297 break; /* bingo! */
298 prev = next;
299 }
300
Changli Gaod6bebca2010-06-29 04:39:37 +0000301found:
Eric Dumazet5de658f2012-01-30 04:29:24 +0000302 /* RFC5722, Section 4, amended by Errata ID : 3089
303 * When reassembling an IPv6 datagram, if
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000304 * one or more its constituent fragments is determined to be an
305 * overlapping fragment, the entire datagram (and any constituent
Eric Dumazet5de658f2012-01-30 04:29:24 +0000306 * fragments) MUST be silently discarded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000309 /* Check for overlap with preceding fragment. */
310 if (prev &&
Shan Weif4642142010-11-05 01:56:34 +0000311 (FRAG6_CB(prev)->offset + prev->len) > offset)
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000312 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000314 /* Look for overlap with succeeding segment. */
315 if (next && FRAG6_CB(next)->offset < end)
316 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318 FRAG6_CB(skb)->offset = offset;
319
320 /* Insert this fragment in the chain of fragments. */
321 skb->next = next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000322 if (!next)
323 fq->q.fragments_tail = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (prev)
325 prev->next = skb;
326 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700327 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Herbert Xuf61944e2007-10-15 01:28:47 -0700329 dev = skb->dev;
330 if (dev) {
331 fq->iif = dev->ifindex;
332 skb->dev = NULL;
333 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700334 fq->q.stamp = skb->tstamp;
335 fq->q.meat += skb->len;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000336 fq->ecn |= ecn;
Florian Westphal0e60d242015-07-23 12:05:38 +0200337 add_frag_mem_limit(fq->q.net, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 /* The first fragment.
340 * nhoffset is obtained from the first fragment, of course.
341 */
342 if (offset == 0) {
343 fq->nhoffset = nhoff;
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200344 fq->q.flags |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700346
Nikolay Aleksandrov06aa8b82014-08-01 12:29:44 +0200347 if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
Eric Dumazet97599dc2013-04-16 12:55:41 +0000348 fq->q.meat == fq->q.len) {
349 int res;
350 unsigned long orefdst = skb->_skb_refdst;
Herbert Xuf61944e2007-10-15 01:28:47 -0700351
Eric Dumazet97599dc2013-04-16 12:55:41 +0000352 skb->_skb_refdst = 0UL;
353 res = ip6_frag_reasm(fq, prev, dev);
354 skb->_skb_refdst = orefdst;
355 return res;
356 }
357
358 skb_dst_drop(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700359 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000361discard_fq:
Amerigo Wangb836c992012-09-18 16:50:09 +0000362 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363err:
Nikolay Aleksandrovd2373862014-08-01 12:29:43 +0200364 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
365 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700367 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
369
370/*
371 * Check if this packet is complete.
372 * Returns NULL on failure by any reason, and pointer
373 * to current nexthdr field in reassembled frame.
374 *
375 * It is called with locked fq, and caller must check that
376 * queue is eligible for reassembly i.e. it is not COMPLETE,
377 * the last and the first frames arrived and all the bits are here.
378 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700379static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 struct net_device *dev)
381{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700382 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700383 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 int payload_len;
385 unsigned int nhoff;
Eric Dumazetec164392012-05-19 03:02:35 +0000386 int sum_truesize;
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000387 u8 ecn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Amerigo Wangb836c992012-09-18 16:50:09 +0000389 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000391 ecn = ip_frag_ecn_table[fq->ecn];
392 if (unlikely(ecn == 0xff))
393 goto out_fail;
394
Herbert Xuf61944e2007-10-15 01:28:47 -0700395 /* Make the one we just received the head. */
396 if (prev) {
397 head = prev->next;
398 fp = skb_clone(head, GFP_ATOMIC);
399
400 if (!fp)
401 goto out_oom;
402
403 fp->next = head->next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000404 if (!fp->next)
405 fq->q.fragments_tail = fp;
Herbert Xuf61944e2007-10-15 01:28:47 -0700406 prev->next = fp;
407
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700408 skb_morph(head, fq->q.fragments);
409 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700410
Eric Dumazet808db802012-04-24 10:17:59 +0000411 consume_skb(fq->q.fragments);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700412 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700413 }
414
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700415 WARN_ON(head == NULL);
416 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700419 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700420 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700421 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (payload_len > IPV6_MAXPLEN)
423 goto out_oversize;
424
425 /* Head of list must not be cloned. */
Pravin B Shelar14bbd6a2013-02-14 09:44:49 +0000426 if (skb_unclone(head, GFP_ATOMIC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 goto out_oom;
428
429 /* If the first fragment is fragmented itself, we split
430 * it to two chunks: the first with data and paged part
431 * and the second, holding only fragments. */
David S. Miller21dc3302010-08-23 00:13:46 -0700432 if (skb_has_frag_list(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 struct sk_buff *clone;
434 int i, plen = 0;
435
Ian Morrise5d08d72014-11-23 21:28:43 +0000436 clone = alloc_skb(0, GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100437 if (!clone)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 goto out_oom;
439 clone->next = head->next;
440 head->next = clone;
441 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700442 skb_frag_list_init(head);
Eric Dumazet9e903e02011-10-18 21:00:24 +0000443 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
444 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 clone->len = clone->data_len = head->data_len - plen;
446 head->data_len -= clone->len;
447 head->len -= clone->len;
448 clone->csum = 0;
449 clone->ip_summed = head->ip_summed;
Florian Westphal0e60d242015-07-23 12:05:38 +0200450 add_frag_mem_limit(fq->q.net, clone->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 }
452
453 /* We have to remove fragment header from datagram and to relocate
454 * header in order to calculate ICV correctly. */
455 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700456 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900457 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700459 head->mac_header += sizeof(struct frag_hdr);
460 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300462 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700463 skb_push(head, head->data - skb_network_header(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Eric Dumazetec164392012-05-19 03:02:35 +0000465 sum_truesize = head->truesize;
466 for (fp = head->next; fp;) {
467 bool headstolen;
468 int delta;
469 struct sk_buff *next = fp->next;
470
471 sum_truesize += fp->truesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 if (head->ip_summed != fp->ip_summed)
473 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700474 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 head->csum = csum_add(head->csum, fp->csum);
Eric Dumazetec164392012-05-19 03:02:35 +0000476
477 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
478 kfree_skb_partial(fp, headstolen);
479 } else {
480 if (!skb_shinfo(head)->frag_list)
481 skb_shinfo(head)->frag_list = fp;
482 head->data_len += fp->len;
483 head->len += fp->len;
484 head->truesize += fp->truesize;
485 }
486 fp = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 }
Florian Westphal0e60d242015-07-23 12:05:38 +0200488 sub_frag_mem_limit(fq->q.net, sum_truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 head->next = NULL;
491 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700492 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700493 ipv6_hdr(head)->payload_len = htons(payload_len);
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000494 ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800495 IP6CB(head)->nhoff = nhoff;
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200496 IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700499 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700500 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300501 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700502 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900504 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700505 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900506 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700507 fq->q.fragments = NULL;
Changli Gaod6bebca2010-06-29 04:39:37 +0000508 fq->q.fragments_tail = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return 1;
510
511out_oversize:
Joe Perchese87cc472012-05-13 21:56:26 +0000512 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 goto out_fail;
514out_oom:
Joe Perchese87cc472012-05-13 21:56:26 +0000515 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900517 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700518 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900519 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 return -1;
521}
522
Herbert Xue5bbef22007-10-15 12:50:28 -0700523static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 struct frag_hdr *fhdr;
526 struct frag_queue *fq;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000527 const struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000528 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200530 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
531 goto fail_hdr;
532
Eric Dumazetadf30902009-06-02 05:19:30 +0000533 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 /* Jumbo payload inhibits frag. header */
Ian Morris67ba4152014-08-24 21:53:10 +0100536 if (hdr->payload_len == 0)
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700537 goto fail_hdr;
538
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700539 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700540 sizeof(struct frag_hdr))))
541 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700543 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700544 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
546 if (!(fhdr->frag_off & htons(0xFFF9))) {
547 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700548 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700549 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000550 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700552 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Hannes Frederic Sowaf46078c2013-08-16 13:30:07 +0200553 IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 return 1;
555 }
556
Hannes Frederic Sowaeec2e612013-03-22 08:24:44 +0000557 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
Michal Kubeček264640f2015-11-24 15:07:11 +0100558 skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
Ian Morris53b24b82015-03-29 14:00:05 +0100559 if (fq) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700560 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700562 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Herbert Xuf61944e2007-10-15 01:28:47 -0700564 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700566 spin_unlock(&fq->q.lock);
Amerigo Wangb836c992012-09-18 16:50:09 +0000567 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return ret;
569 }
570
Eric Dumazetadf30902009-06-02 05:19:30 +0000571 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 kfree_skb(skb);
573 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700574
575fail_hdr:
Nikolay Aleksandrovd2373862014-08-01 12:29:43 +0200576 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
577 IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700578 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
579 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
Ian Morriscc24bec2014-08-24 21:53:11 +0100582static const struct inet6_protocol frag_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 .handler = ipv6_frag_rcv,
584 .flags = INET6_PROTO_NOPOLICY,
585};
586
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800587#ifdef CONFIG_SYSCTL
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200588static int zero;
589
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700590static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800591 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800592 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800593 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800594 .maxlen = sizeof(int),
595 .mode = 0644,
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200596 .proc_handler = proc_dointvec_minmax,
597 .extra1 = &init_net.ipv6.frags.low_thresh
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800598 },
599 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800600 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800601 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800602 .maxlen = sizeof(int),
603 .mode = 0644,
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200604 .proc_handler = proc_dointvec_minmax,
605 .extra1 = &zero,
606 .extra2 = &init_net.ipv6.frags.high_thresh
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800607 },
608 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800609 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800610 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800611 .maxlen = sizeof(int),
612 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800613 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800614 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700615 { }
616};
617
Florian Westphale3a57d12014-07-24 16:50:35 +0200618/* secret interval has been deprecated */
619static int ip6_frags_secret_interval_unused;
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700620static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800621 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800622 .procname = "ip6frag_secret_interval",
Florian Westphale3a57d12014-07-24 16:50:35 +0200623 .data = &ip6_frags_secret_interval_unused,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800624 .maxlen = sizeof(int),
625 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800626 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800627 },
628 { }
629};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800630
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000631static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800632{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800633 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800634 struct ctl_table_header *hdr;
635
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700636 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800637 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700638 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100639 if (!table)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800640 goto err_alloc;
641
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800642 table[0].data = &net->ipv6.frags.high_thresh;
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200643 table[0].extra1 = &net->ipv6.frags.low_thresh;
644 table[0].extra2 = &init_net.ipv6.frags.high_thresh;
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800645 table[1].data = &net->ipv6.frags.low_thresh;
Nikolay Aleksandrov1bab4c72014-07-24 16:50:37 +0200646 table[1].extra2 = &net->ipv6.frags.high_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800647 table[2].data = &net->ipv6.frags.timeout;
Eric W. Biederman464dc802012-11-16 03:02:59 +0000648
649 /* Don't export sysctls to unprivileged users */
650 if (net->user_ns != &init_user_ns)
651 table[0].procname = NULL;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800652 }
653
Eric W. Biedermanec8f23c2012-04-19 13:44:49 +0000654 hdr = register_net_sysctl(net, "net/ipv6", table);
Ian Morris63159f22015-03-29 14:00:04 +0100655 if (!hdr)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800656 goto err_reg;
657
658 net->ipv6.sysctl.frags_hdr = hdr;
659 return 0;
660
661err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800662 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800663 kfree(table);
664err_alloc:
665 return -ENOMEM;
666}
667
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000668static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800669{
670 struct ctl_table *table;
671
672 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
673 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800674 if (!net_eq(net, &init_net))
675 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800676}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700677
678static struct ctl_table_header *ip6_ctl_header;
679
680static int ip6_frags_sysctl_register(void)
681{
Eric W. Biederman43444752012-04-19 13:22:55 +0000682 ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700683 ip6_frags_ctl_table);
684 return ip6_ctl_header == NULL ? -ENOMEM : 0;
685}
686
687static void ip6_frags_sysctl_unregister(void)
688{
689 unregister_net_sysctl_table(ip6_ctl_header);
690}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800691#else
Fabian Frederickfc08c252014-10-29 11:38:17 +0100692static int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800693{
694 return 0;
695}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800696
Fabian Frederickfc08c252014-10-29 11:38:17 +0100697static void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800698{
699}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700700
Fabian Frederickfc08c252014-10-29 11:38:17 +0100701static int ip6_frags_sysctl_register(void)
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700702{
703 return 0;
704}
705
Fabian Frederickfc08c252014-10-29 11:38:17 +0100706static void ip6_frags_sysctl_unregister(void)
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700707{
708}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800709#endif
710
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000711static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800712{
Eric Dumazet1d6119b2015-11-02 09:03:11 -0800713 int res;
714
Shan Wei7c070aa2010-01-20 10:42:41 +0100715 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
716 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800717 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800718
Eric Dumazet1d6119b2015-11-02 09:03:11 -0800719 res = inet_frags_init_net(&net->ipv6.frags);
720 if (res)
721 return res;
722 res = ip6_frags_ns_sysctl_register(net);
723 if (res)
724 inet_frags_uninit_net(&net->ipv6.frags);
725 return res;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800726}
727
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000728static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800729{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700730 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800731 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
732}
733
734static struct pernet_operations ip6_frags_ops = {
735 .init = ipv6_frags_init_net,
736 .exit = ipv6_frags_exit_net,
737};
738
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800739int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800741 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800743 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
744 if (ret)
745 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800746
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700747 ret = ip6_frags_sysctl_register();
748 if (ret)
749 goto err_sysctl;
750
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700751 ret = register_pernet_subsys(&ip6_frags_ops);
752 if (ret)
753 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800754
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700755 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700756 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700757 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700758 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700759 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700760 ip6_frags.frag_expire = ip6_frag_expire;
Nikolay Aleksandrovd4ad4d22014-08-01 12:29:48 +0200761 ip6_frags.frags_cache_name = ip6_frag_cache_name;
762 ret = inet_frags_init(&ip6_frags);
763 if (ret)
764 goto err_pernet;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800765out:
766 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700767
768err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700769 ip6_frags_sysctl_unregister();
770err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700771 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
772 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800773}
774
775void ipv6_frag_exit(void)
776{
777 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700778 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800779 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800780 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781}