Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 fragment reassembly |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Based on: net/ipv4/ip_fragment.c |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 16 | /* |
| 17 | * Fixes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * Andi Kleen Make it work with multiple hosts. |
| 19 | * More RFC compliance. |
| 20 | * |
| 21 | * Horst von Brand Add missing #include <linux/string.h> |
| 22 | * Alexey Kuznetsov SMP races, threading, cleanup. |
| 23 | * Patrick McHardy LRU queue of frag heads for evictor. |
| 24 | * Mitsuru KANDA @USAGI Register inet6_protocol{}. |
| 25 | * David Stevens and |
| 26 | * YOSHIFUJI,H. @USAGI Always remove fragment header to |
| 27 | * calculate ICV correctly. |
| 28 | */ |
Hannes Frederic Sowa | 5a3da1f | 2013-03-15 11:32:30 +0000 | [diff] [blame] | 29 | |
| 30 | #define pr_fmt(fmt) "IPv6: " fmt |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/errno.h> |
| 33 | #include <linux/types.h> |
| 34 | #include <linux/string.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/sockios.h> |
| 37 | #include <linux/jiffies.h> |
| 38 | #include <linux/net.h> |
| 39 | #include <linux/list.h> |
| 40 | #include <linux/netdevice.h> |
| 41 | #include <linux/in6.h> |
| 42 | #include <linux/ipv6.h> |
| 43 | #include <linux/icmpv6.h> |
| 44 | #include <linux/random.h> |
| 45 | #include <linux/jhash.h> |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 46 | #include <linux/skbuff.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 47 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 48 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | #include <net/sock.h> |
| 51 | #include <net/snmp.h> |
| 52 | |
| 53 | #include <net/ipv6.h> |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 54 | #include <net/ip6_route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <net/protocol.h> |
| 56 | #include <net/transp_v6.h> |
| 57 | #include <net/rawv6.h> |
| 58 | #include <net/ndisc.h> |
| 59 | #include <net/addrconf.h> |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 60 | #include <net/inet_frag.h> |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 61 | #include <net/inet_ecn.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 63 | static const char ip6_frag_cache_name[] = "ip6-frags"; |
| 64 | |
Ian Morris | cc24bec | 2014-08-24 21:53:11 +0100 | [diff] [blame] | 65 | struct ip6frag_skb_cb { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | struct inet6_skb_parm h; |
| 67 | int offset; |
| 68 | }; |
| 69 | |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 70 | #define FRAG6_CB(skb) ((struct ip6frag_skb_cb *)((skb)->cb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 72 | static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 73 | { |
| 74 | return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); |
| 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 77 | static struct inet_frags ip6_frags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 79 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
| 80 | struct net_device *dev); |
| 81 | |
Florian Westphal | 36c7778 | 2014-07-24 16:50:29 +0200 | [diff] [blame] | 82 | void ip6_frag_init(struct inet_frag_queue *q, const void *a) |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 83 | { |
| 84 | struct frag_queue *fq = container_of(q, struct frag_queue, q); |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 85 | const struct frag_v6_compare_key *key = a; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 86 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 87 | q->key.v6 = *key; |
| 88 | fq->ecn = 0; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 89 | } |
| 90 | EXPORT_SYMBOL(ip6_frag_init); |
| 91 | |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 92 | void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 94 | struct net_device *dev = NULL; |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 95 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 96 | spin_lock(&fq->q.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 98 | if (fq->q.flags & INET_FRAG_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | goto out; |
| 100 | |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 101 | inet_frag_kill(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 103 | rcu_read_lock(); |
Eric Dumazet | 69df9d5 | 2009-11-05 20:59:47 -0800 | [diff] [blame] | 104 | dev = dev_get_by_index_rcu(net, fq->iif); |
| 105 | if (!dev) |
| 106 | goto out_rcu_unlock; |
| 107 | |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 108 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 109 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); |
Nikolay Aleksandrov | 2e404f6 | 2014-08-01 12:29:47 +0200 | [diff] [blame] | 110 | |
Ingo Oeser | 78c784c | 2006-03-20 23:01:17 -0800 | [diff] [blame] | 111 | /* Don't send error if the first segment did not arrive. */ |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 112 | if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments) |
Eric Dumazet | 69df9d5 | 2009-11-05 20:59:47 -0800 | [diff] [blame] | 113 | goto out_rcu_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Nikolay Aleksandrov | 2e404f6 | 2014-08-01 12:29:47 +0200 | [diff] [blame] | 115 | /* But use as source device on which LAST ARRIVED |
| 116 | * segment was received. And do not use fq->dev |
| 117 | * pointer directly, device might already disappeared. |
Ingo Oeser | 78c784c | 2006-03-20 23:01:17 -0800 | [diff] [blame] | 118 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 119 | fq->q.fragments->dev = dev; |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 120 | icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0); |
Eric Dumazet | 69df9d5 | 2009-11-05 20:59:47 -0800 | [diff] [blame] | 121 | out_rcu_unlock: |
| 122 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | out: |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 124 | spin_unlock(&fq->q.lock); |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 125 | inet_frag_put(&fq->q); |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 126 | } |
| 127 | EXPORT_SYMBOL(ip6_expire_frag_queue); |
| 128 | |
| 129 | static void ip6_frag_expire(unsigned long data) |
| 130 | { |
| 131 | struct frag_queue *fq; |
| 132 | struct net *net; |
| 133 | |
| 134 | fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q); |
| 135 | net = container_of(fq->q.net, struct net, ipv6.frags); |
| 136 | |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 137 | ip6_expire_frag_queue(net, fq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 140 | static struct frag_queue * |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 141 | fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 143 | struct frag_v6_compare_key key = { |
| 144 | .id = id, |
| 145 | .saddr = hdr->saddr, |
| 146 | .daddr = hdr->daddr, |
| 147 | .user = IP6_DEFRAG_LOCAL_DELIVER, |
| 148 | .iif = iif, |
| 149 | }; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 150 | struct inet_frag_queue *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 152 | if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST | |
| 153 | IPV6_ADDR_LINKLOCAL))) |
| 154 | key.iif = 0; |
Pavel Emelyanov | 9a37580 | 2008-06-27 20:06:08 -0700 | [diff] [blame] | 155 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 156 | q = inet_frag_find(&net->ipv6.frags, &key); |
Eric Dumazet | 965e2ad | 2018-10-10 12:29:59 -0700 | [diff] [blame^] | 157 | if (!q) |
Shan Wei | 9546377 | 2010-02-11 00:12:45 +0000 | [diff] [blame] | 158 | return NULL; |
Eric Dumazet | 965e2ad | 2018-10-10 12:29:59 -0700 | [diff] [blame^] | 159 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 160 | return container_of(q, struct frag_queue, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
| 162 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 163 | static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | struct frag_hdr *fhdr, int nhoff) |
| 165 | { |
| 166 | struct sk_buff *prev, *next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 167 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | int offset, end; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 169 | struct net *net = dev_net(skb_dst(skb)->dev); |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 170 | u8 ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 172 | if (fq->q.flags & INET_FRAG_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | goto err; |
| 174 | |
| 175 | offset = ntohs(fhdr->frag_off) & ~0x7; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 176 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
| 177 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | if ((unsigned int)end > IPV6_MAXPLEN) { |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 180 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 181 | IPSTATS_MIB_INHDRERRORS); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 182 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 183 | ((u8 *)&fhdr->frag_off - |
| 184 | skb_network_header(skb))); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 185 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 188 | ecn = ip6_frag_ecn(ipv6_hdr(skb)); |
| 189 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 190 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 191 | const unsigned char *nh = skb_network_header(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 192 | skb->csum = csum_sub(skb->csum, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 193 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
| 194 | 0)); |
| 195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | /* Is this the final fragment? */ |
| 198 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
| 199 | /* If we already have some bits beyond end |
| 200 | * or have different end, the segment is corrupted. |
| 201 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 202 | if (end < fq->q.len || |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 203 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | goto err; |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 205 | fq->q.flags |= INET_FRAG_LAST_IN; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 206 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } else { |
| 208 | /* Check if the fragment is rounded to 8 bytes. |
| 209 | * Required by the RFC. |
| 210 | */ |
| 211 | if (end & 0x7) { |
| 212 | /* RFC2460 says always send parameter problem in |
| 213 | * this case. -DaveM |
| 214 | */ |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 215 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 216 | IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 217 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | offsetof(struct ipv6hdr, payload_len)); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 219 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 221 | if (end > fq->q.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | /* Some bits beyond end -> corruption. */ |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 223 | if (fq->q.flags & INET_FRAG_LAST_IN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | goto err; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 225 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | |
| 229 | if (end == offset) |
| 230 | goto err; |
| 231 | |
| 232 | /* Point into the IP datagram 'data' part. */ |
| 233 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) |
| 234 | goto err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 235 | |
Stephen Hemminger | 42ca89c | 2005-09-08 12:57:43 -0700 | [diff] [blame] | 236 | if (pskb_trim_rcsum(skb, end - offset)) |
| 237 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | /* Find out which fragments are in front and at the back of us |
| 240 | * in the chain of fragments so far. We must know where to put |
| 241 | * this fragment, right? |
| 242 | */ |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 243 | prev = fq->q.fragments_tail; |
| 244 | if (!prev || FRAG6_CB(prev)->offset < offset) { |
| 245 | next = NULL; |
| 246 | goto found; |
| 247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | prev = NULL; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 249 | for (next = fq->q.fragments; next != NULL; next = next->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | if (FRAG6_CB(next)->offset >= offset) |
| 251 | break; /* bingo! */ |
| 252 | prev = next; |
| 253 | } |
| 254 | |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 255 | found: |
Eric Dumazet | 5de658f | 2012-01-30 04:29:24 +0000 | [diff] [blame] | 256 | /* RFC5722, Section 4, amended by Errata ID : 3089 |
| 257 | * When reassembling an IPv6 datagram, if |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 258 | * one or more its constituent fragments is determined to be an |
| 259 | * overlapping fragment, the entire datagram (and any constituent |
Eric Dumazet | 5de658f | 2012-01-30 04:29:24 +0000 | [diff] [blame] | 260 | * fragments) MUST be silently discarded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 263 | /* Check for overlap with preceding fragment. */ |
| 264 | if (prev && |
Shan Wei | f464214 | 2010-11-05 01:56:34 +0000 | [diff] [blame] | 265 | (FRAG6_CB(prev)->offset + prev->len) > offset) |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 266 | goto discard_fq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 268 | /* Look for overlap with succeeding segment. */ |
| 269 | if (next && FRAG6_CB(next)->offset < end) |
| 270 | goto discard_fq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | FRAG6_CB(skb)->offset = offset; |
| 273 | |
| 274 | /* Insert this fragment in the chain of fragments. */ |
| 275 | skb->next = next; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 276 | if (!next) |
| 277 | fq->q.fragments_tail = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | if (prev) |
| 279 | prev->next = skb; |
| 280 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 281 | fq->q.fragments = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 283 | dev = skb->dev; |
| 284 | if (dev) { |
| 285 | fq->iif = dev->ifindex; |
| 286 | skb->dev = NULL; |
| 287 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 288 | fq->q.stamp = skb->tstamp; |
| 289 | fq->q.meat += skb->len; |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 290 | fq->ecn |= ecn; |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 291 | add_frag_mem_limit(fq->q.net, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
| 293 | /* The first fragment. |
| 294 | * nhoffset is obtained from the first fragment, of course. |
| 295 | */ |
| 296 | if (offset == 0) { |
| 297 | fq->nhoffset = nhoff; |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 298 | fq->q.flags |= INET_FRAG_FIRST_IN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 300 | |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 301 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
Eric Dumazet | 97599dc | 2013-04-16 12:55:41 +0000 | [diff] [blame] | 302 | fq->q.meat == fq->q.len) { |
| 303 | int res; |
| 304 | unsigned long orefdst = skb->_skb_refdst; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 305 | |
Eric Dumazet | 97599dc | 2013-04-16 12:55:41 +0000 | [diff] [blame] | 306 | skb->_skb_refdst = 0UL; |
| 307 | res = ip6_frag_reasm(fq, prev, dev); |
| 308 | skb->_skb_refdst = orefdst; |
| 309 | return res; |
| 310 | } |
| 311 | |
| 312 | skb_dst_drop(skb); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 313 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 315 | discard_fq: |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 316 | inet_frag_kill(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | err: |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 318 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 319 | IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | kfree_skb(skb); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 321 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Check if this packet is complete. |
| 326 | * Returns NULL on failure by any reason, and pointer |
| 327 | * to current nexthdr field in reassembled frame. |
| 328 | * |
| 329 | * It is called with locked fq, and caller must check that |
| 330 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
| 331 | * the last and the first frames arrived and all the bits are here. |
| 332 | */ |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 333 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | struct net_device *dev) |
| 335 | { |
Jorge Boncompte [DTI2] | 2bad35b | 2009-03-18 23:26:11 -0700 | [diff] [blame] | 336 | struct net *net = container_of(fq->q.net, struct net, ipv6.frags); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 337 | struct sk_buff *fp, *head = fq->q.fragments; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | int payload_len; |
| 339 | unsigned int nhoff; |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 340 | int sum_truesize; |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 341 | u8 ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 343 | inet_frag_kill(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 345 | ecn = ip_frag_ecn_table[fq->ecn]; |
| 346 | if (unlikely(ecn == 0xff)) |
| 347 | goto out_fail; |
| 348 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 349 | /* Make the one we just received the head. */ |
| 350 | if (prev) { |
| 351 | head = prev->next; |
| 352 | fp = skb_clone(head, GFP_ATOMIC); |
| 353 | |
| 354 | if (!fp) |
| 355 | goto out_oom; |
| 356 | |
| 357 | fp->next = head->next; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 358 | if (!fp->next) |
| 359 | fq->q.fragments_tail = fp; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 360 | prev->next = fp; |
| 361 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 362 | skb_morph(head, fq->q.fragments); |
| 363 | head->next = fq->q.fragments->next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 364 | |
Eric Dumazet | 808db80 | 2012-04-24 10:17:59 +0000 | [diff] [blame] | 365 | consume_skb(fq->q.fragments); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 366 | fq->q.fragments = head; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 369 | WARN_ON(head == NULL); |
| 370 | WARN_ON(FRAG6_CB(head)->offset != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | /* Unfragmented part is taken from the first segment. */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 373 | payload_len = ((head->data - skb_network_header(head)) - |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 374 | sizeof(struct ipv6hdr) + fq->q.len - |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 375 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (payload_len > IPV6_MAXPLEN) |
| 377 | goto out_oversize; |
| 378 | |
| 379 | /* Head of list must not be cloned. */ |
Pravin B Shelar | 14bbd6a | 2013-02-14 09:44:49 +0000 | [diff] [blame] | 380 | if (skb_unclone(head, GFP_ATOMIC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | goto out_oom; |
| 382 | |
| 383 | /* If the first fragment is fragmented itself, we split |
| 384 | * it to two chunks: the first with data and paged part |
| 385 | * and the second, holding only fragments. */ |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 386 | if (skb_has_frag_list(head)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | struct sk_buff *clone; |
| 388 | int i, plen = 0; |
| 389 | |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 390 | clone = alloc_skb(0, GFP_ATOMIC); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 391 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | goto out_oom; |
| 393 | clone->next = head->next; |
| 394 | head->next = clone; |
| 395 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 396 | skb_frag_list_init(head); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 397 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) |
| 398 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | clone->len = clone->data_len = head->data_len - plen; |
| 400 | head->data_len -= clone->len; |
| 401 | head->len -= clone->len; |
| 402 | clone->csum = 0; |
| 403 | clone->ip_summed = head->ip_summed; |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 404 | add_frag_mem_limit(fq->q.net, clone->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | /* We have to remove fragment header from datagram and to relocate |
| 408 | * header in order to calculate ICV correctly. */ |
| 409 | nhoff = fq->nhoffset; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 410 | skb_network_header(head)[nhoff] = skb_transport_header(head)[0]; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 411 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | (head->data - head->head) - sizeof(struct frag_hdr)); |
Jason A. Donenfeld | b678aa5 | 2016-10-21 18:28:25 +0900 | [diff] [blame] | 413 | if (skb_mac_header_was_set(head)) |
| 414 | head->mac_header += sizeof(struct frag_hdr); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 415 | head->network_header += sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 417 | skb_reset_transport_header(head); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 418 | skb_push(head, head->data - skb_network_header(head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 420 | sum_truesize = head->truesize; |
| 421 | for (fp = head->next; fp;) { |
| 422 | bool headstolen; |
| 423 | int delta; |
| 424 | struct sk_buff *next = fp->next; |
| 425 | |
| 426 | sum_truesize += fp->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (head->ip_summed != fp->ip_summed) |
| 428 | head->ip_summed = CHECKSUM_NONE; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 429 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | head->csum = csum_add(head->csum, fp->csum); |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 431 | |
| 432 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { |
| 433 | kfree_skb_partial(fp, headstolen); |
| 434 | } else { |
| 435 | if (!skb_shinfo(head)->frag_list) |
| 436 | skb_shinfo(head)->frag_list = fp; |
| 437 | head->data_len += fp->len; |
| 438 | head->len += fp->len; |
| 439 | head->truesize += fp->truesize; |
| 440 | } |
| 441 | fp = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 443 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | head->next = NULL; |
| 446 | head->dev = dev; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 447 | head->tstamp = fq->q.stamp; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 448 | ipv6_hdr(head)->payload_len = htons(payload_len); |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 449 | ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 450 | IP6CB(head)->nhoff = nhoff; |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 451 | IP6CB(head)->flags |= IP6SKB_FRAGMENTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* Yes, and fold redundant checksum back. 8) */ |
Daniel Borkmann | 6b83d28 | 2016-02-20 00:29:30 +0100 | [diff] [blame] | 454 | skb_postpush_rcsum(head, skb_network_header(head), |
| 455 | skb_network_header_len(head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 457 | rcu_read_lock(); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 458 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 459 | rcu_read_unlock(); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 460 | fq->q.fragments = NULL; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 461 | fq->q.fragments_tail = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return 1; |
| 463 | |
| 464 | out_oversize: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 465 | net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | goto out_fail; |
| 467 | out_oom: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 468 | net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | out_fail: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 470 | rcu_read_lock(); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 471 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 472 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | return -1; |
| 474 | } |
| 475 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 476 | static int ipv6_frag_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | struct frag_hdr *fhdr; |
| 479 | struct frag_queue *fq; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 480 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 481 | struct net *net = dev_net(skb_dst(skb)->dev); |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 482 | int iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 484 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED) |
| 485 | goto fail_hdr; |
| 486 | |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 487 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | /* Jumbo payload inhibits frag. header */ |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 490 | if (hdr->payload_len == 0) |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 491 | goto fail_hdr; |
| 492 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 493 | if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 494 | sizeof(struct frag_hdr)))) |
| 495 | goto fail_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 497 | hdr = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 498 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | if (!(fhdr->frag_off & htons(0xFFF9))) { |
| 501 | /* It is not a fragmented frame */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 502 | skb->transport_header += sizeof(struct frag_hdr); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 503 | __IP6_INC_STATS(net, |
| 504 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 506 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 507 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return 1; |
| 509 | } |
| 510 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 511 | iif = skb->dev ? skb->dev->ifindex : 0; |
| 512 | fq = fq_find(net, fhdr->identification, hdr, iif); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 513 | if (fq) { |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 514 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 516 | spin_lock(&fq->q.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 518 | fq->iif = iif; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 519 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 521 | spin_unlock(&fq->q.lock); |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 522 | inet_frag_put(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return ret; |
| 524 | } |
| 525 | |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 526 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | kfree_skb(skb); |
| 528 | return -1; |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 529 | |
| 530 | fail_hdr: |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 531 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 532 | IPSTATS_MIB_INHDRERRORS); |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 533 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
| 534 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
Ian Morris | cc24bec | 2014-08-24 21:53:11 +0100 | [diff] [blame] | 537 | static const struct inet6_protocol frag_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | .handler = ipv6_frag_rcv, |
| 539 | .flags = INET6_PROTO_NOPOLICY, |
| 540 | }; |
| 541 | |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 542 | #ifdef CONFIG_SYSCTL |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 543 | static int zero; |
| 544 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 545 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 546 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 547 | .procname = "ip6frag_high_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 548 | .data = &init_net.ipv6.frags.high_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 549 | .maxlen = sizeof(int), |
| 550 | .mode = 0644, |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 551 | .proc_handler = proc_dointvec_minmax, |
| 552 | .extra1 = &init_net.ipv6.frags.low_thresh |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 553 | }, |
| 554 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 555 | .procname = "ip6frag_low_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 556 | .data = &init_net.ipv6.frags.low_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 557 | .maxlen = sizeof(int), |
| 558 | .mode = 0644, |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 559 | .proc_handler = proc_dointvec_minmax, |
| 560 | .extra1 = &zero, |
| 561 | .extra2 = &init_net.ipv6.frags.high_thresh |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 562 | }, |
| 563 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 564 | .procname = "ip6frag_time", |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 565 | .data = &init_net.ipv6.frags.timeout, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 566 | .maxlen = sizeof(int), |
| 567 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 568 | .proc_handler = proc_dointvec_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 569 | }, |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 570 | { } |
| 571 | }; |
| 572 | |
Florian Westphal | e3a57d1 | 2014-07-24 16:50:35 +0200 | [diff] [blame] | 573 | /* secret interval has been deprecated */ |
| 574 | static int ip6_frags_secret_interval_unused; |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 575 | static struct ctl_table ip6_frags_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 576 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 577 | .procname = "ip6frag_secret_interval", |
Florian Westphal | e3a57d1 | 2014-07-24 16:50:35 +0200 | [diff] [blame] | 578 | .data = &ip6_frags_secret_interval_unused, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 579 | .maxlen = sizeof(int), |
| 580 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 581 | .proc_handler = proc_dointvec_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 582 | }, |
| 583 | { } |
| 584 | }; |
Daniel Lezcano | 7d460db | 2008-01-18 23:52:35 -0800 | [diff] [blame] | 585 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 586 | static int __net_init ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 587 | { |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 588 | struct ctl_table *table; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 589 | struct ctl_table_header *hdr; |
| 590 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 591 | table = ip6_frags_ns_ctl_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 592 | if (!net_eq(net, &init_net)) { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 593 | table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 594 | if (!table) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 595 | goto err_alloc; |
| 596 | |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 597 | table[0].data = &net->ipv6.frags.high_thresh; |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 598 | table[0].extra1 = &net->ipv6.frags.low_thresh; |
| 599 | table[0].extra2 = &init_net.ipv6.frags.high_thresh; |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 600 | table[1].data = &net->ipv6.frags.low_thresh; |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 601 | table[1].extra2 = &net->ipv6.frags.high_thresh; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 602 | table[2].data = &net->ipv6.frags.timeout; |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 603 | } |
| 604 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 605 | hdr = register_net_sysctl(net, "net/ipv6", table); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 606 | if (!hdr) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 607 | goto err_reg; |
| 608 | |
| 609 | net->ipv6.sysctl.frags_hdr = hdr; |
| 610 | return 0; |
| 611 | |
| 612 | err_reg: |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 613 | if (!net_eq(net, &init_net)) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 614 | kfree(table); |
| 615 | err_alloc: |
| 616 | return -ENOMEM; |
| 617 | } |
| 618 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 619 | static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 620 | { |
| 621 | struct ctl_table *table; |
| 622 | |
| 623 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; |
| 624 | unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); |
Yang Hongyang | 3705e11 | 2009-12-18 20:25:13 -0800 | [diff] [blame] | 625 | if (!net_eq(net, &init_net)) |
| 626 | kfree(table); |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 627 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 628 | |
| 629 | static struct ctl_table_header *ip6_ctl_header; |
| 630 | |
| 631 | static int ip6_frags_sysctl_register(void) |
| 632 | { |
Eric W. Biederman | 4344475 | 2012-04-19 13:22:55 +0000 | [diff] [blame] | 633 | ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6", |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 634 | ip6_frags_ctl_table); |
| 635 | return ip6_ctl_header == NULL ? -ENOMEM : 0; |
| 636 | } |
| 637 | |
| 638 | static void ip6_frags_sysctl_unregister(void) |
| 639 | { |
| 640 | unregister_net_sysctl_table(ip6_ctl_header); |
| 641 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 642 | #else |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 643 | static int ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 644 | { |
| 645 | return 0; |
| 646 | } |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 647 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 648 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 649 | { |
| 650 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 651 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 652 | static int ip6_frags_sysctl_register(void) |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 653 | { |
| 654 | return 0; |
| 655 | } |
| 656 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 657 | static void ip6_frags_sysctl_unregister(void) |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 658 | { |
| 659 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 660 | #endif |
| 661 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 662 | static int __net_init ipv6_frags_init_net(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 663 | { |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 664 | int res; |
| 665 | |
Shan Wei | 7c070aa | 2010-01-20 10:42:41 +0100 | [diff] [blame] | 666 | net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
| 667 | net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 668 | net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT; |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 669 | net->ipv6.frags.f = &ip6_frags; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 670 | |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 671 | res = inet_frags_init_net(&net->ipv6.frags); |
| 672 | if (res < 0) |
| 673 | return res; |
Jesper Dangaard Brouer | 1bcf187 | 2017-09-01 11:26:13 +0200 | [diff] [blame] | 674 | |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 675 | res = ip6_frags_ns_sysctl_register(net); |
| 676 | if (res < 0) |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 677 | inet_frags_exit_net(&net->ipv6.frags); |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 678 | return res; |
Daniel Lezcano | e71e034 | 2008-01-10 02:56:03 -0800 | [diff] [blame] | 679 | } |
| 680 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 681 | static void __net_exit ipv6_frags_exit_net(struct net *net) |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 682 | { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 683 | ip6_frags_ns_sysctl_unregister(net); |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 684 | inet_frags_exit_net(&net->ipv6.frags); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | static struct pernet_operations ip6_frags_ops = { |
| 688 | .init = ipv6_frags_init_net, |
| 689 | .exit = ipv6_frags_exit_net, |
| 690 | }; |
| 691 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 692 | static u32 ip6_key_hashfn(const void *data, u32 len, u32 seed) |
| 693 | { |
| 694 | return jhash2(data, |
| 695 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); |
| 696 | } |
| 697 | |
| 698 | static u32 ip6_obj_hashfn(const void *data, u32 len, u32 seed) |
| 699 | { |
| 700 | const struct inet_frag_queue *fq = data; |
| 701 | |
| 702 | return jhash2((const u32 *)&fq->key.v6, |
| 703 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); |
| 704 | } |
| 705 | |
| 706 | static int ip6_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) |
| 707 | { |
| 708 | const struct frag_v6_compare_key *key = arg->key; |
| 709 | const struct inet_frag_queue *fq = ptr; |
| 710 | |
| 711 | return !!memcmp(&fq->key, key, sizeof(*key)); |
| 712 | } |
| 713 | |
| 714 | const struct rhashtable_params ip6_rhash_params = { |
| 715 | .head_offset = offsetof(struct inet_frag_queue, node), |
| 716 | .hashfn = ip6_key_hashfn, |
| 717 | .obj_hashfn = ip6_obj_hashfn, |
| 718 | .obj_cmpfn = ip6_obj_cmpfn, |
| 719 | .automatic_shrinking = true, |
| 720 | }; |
| 721 | EXPORT_SYMBOL(ip6_rhash_params); |
| 722 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 723 | int __init ipv6_frag_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 725 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 727 | ip6_frags.constructor = ip6_frag_init; |
Pavel Emelyanov | c954770 | 2007-10-17 19:48:26 -0700 | [diff] [blame] | 728 | ip6_frags.destructor = NULL; |
Pavel Emelyanov | 1e4b828 | 2007-10-15 02:39:14 -0700 | [diff] [blame] | 729 | ip6_frags.qsize = sizeof(struct frag_queue); |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 730 | ip6_frags.frag_expire = ip6_frag_expire; |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 731 | ip6_frags.frags_cache_name = ip6_frag_cache_name; |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 732 | ip6_frags.rhash_params = ip6_rhash_params; |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 733 | ret = inet_frags_init(&ip6_frags); |
| 734 | if (ret) |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 735 | goto out; |
| 736 | |
| 737 | ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| 738 | if (ret) |
| 739 | goto err_protocol; |
| 740 | |
| 741 | ret = ip6_frags_sysctl_register(); |
| 742 | if (ret) |
| 743 | goto err_sysctl; |
| 744 | |
| 745 | ret = register_pernet_subsys(&ip6_frags_ops); |
| 746 | if (ret) |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 747 | goto err_pernet; |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 748 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 749 | out: |
| 750 | return ret; |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 751 | |
| 752 | err_pernet: |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 753 | ip6_frags_sysctl_unregister(); |
| 754 | err_sysctl: |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 755 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 756 | err_protocol: |
| 757 | inet_frags_fini(&ip6_frags); |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 758 | goto out; |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | void ipv6_frag_exit(void) |
| 762 | { |
| 763 | inet_frags_fini(&ip6_frags); |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 764 | ip6_frags_sysctl_unregister(); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 765 | unregister_pernet_subsys(&ip6_frags_ops); |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 766 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |