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); |
Hannes Frederic Sowa | 5a3da1f | 2013-03-15 11:32:30 +0000 | [diff] [blame] | 157 | if (IS_ERR_OR_NULL(q)) { |
| 158 | inet_frag_maybe_warn_overflow(q, pr_fmt()); |
Shan Wei | 9546377 | 2010-02-11 00:12:45 +0000 | [diff] [blame] | 159 | return NULL; |
Hannes Frederic Sowa | 5a3da1f | 2013-03-15 11:32:30 +0000 | [diff] [blame] | 160 | } |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 161 | return container_of(q, struct frag_queue, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 164 | 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] | 165 | struct frag_hdr *fhdr, int nhoff) |
| 166 | { |
| 167 | struct sk_buff *prev, *next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 168 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | int offset, end; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 170 | struct net *net = dev_net(skb_dst(skb)->dev); |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 171 | u8 ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 173 | if (fq->q.flags & INET_FRAG_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | goto err; |
| 175 | |
| 176 | offset = ntohs(fhdr->frag_off) & ~0x7; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 177 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
| 178 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | if ((unsigned int)end > IPV6_MAXPLEN) { |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 181 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 182 | IPSTATS_MIB_INHDRERRORS); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 183 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 184 | ((u8 *)&fhdr->frag_off - |
| 185 | skb_network_header(skb))); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 186 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 189 | ecn = ip6_frag_ecn(ipv6_hdr(skb)); |
| 190 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 191 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 192 | const unsigned char *nh = skb_network_header(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 193 | skb->csum = csum_sub(skb->csum, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 194 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
| 195 | 0)); |
| 196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | /* Is this the final fragment? */ |
| 199 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
| 200 | /* If we already have some bits beyond end |
| 201 | * or have different end, the segment is corrupted. |
| 202 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 203 | if (end < fq->q.len || |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 204 | ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | goto err; |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 206 | fq->q.flags |= INET_FRAG_LAST_IN; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 207 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } else { |
| 209 | /* Check if the fragment is rounded to 8 bytes. |
| 210 | * Required by the RFC. |
| 211 | */ |
| 212 | if (end & 0x7) { |
| 213 | /* RFC2460 says always send parameter problem in |
| 214 | * this case. -DaveM |
| 215 | */ |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 216 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 217 | IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 218 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | offsetof(struct ipv6hdr, payload_len)); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 220 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 222 | if (end > fq->q.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | /* Some bits beyond end -> corruption. */ |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 224 | if (fq->q.flags & INET_FRAG_LAST_IN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | goto err; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 226 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | } |
| 229 | |
| 230 | if (end == offset) |
| 231 | goto err; |
| 232 | |
| 233 | /* Point into the IP datagram 'data' part. */ |
| 234 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) |
| 235 | goto err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 236 | |
Stephen Hemminger | 42ca89c | 2005-09-08 12:57:43 -0700 | [diff] [blame] | 237 | if (pskb_trim_rcsum(skb, end - offset)) |
| 238 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | /* Find out which fragments are in front and at the back of us |
| 241 | * in the chain of fragments so far. We must know where to put |
| 242 | * this fragment, right? |
| 243 | */ |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 244 | prev = fq->q.fragments_tail; |
| 245 | if (!prev || FRAG6_CB(prev)->offset < offset) { |
| 246 | next = NULL; |
| 247 | goto found; |
| 248 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | prev = NULL; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 250 | for (next = fq->q.fragments; next != NULL; next = next->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (FRAG6_CB(next)->offset >= offset) |
| 252 | break; /* bingo! */ |
| 253 | prev = next; |
| 254 | } |
| 255 | |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 256 | found: |
Eric Dumazet | 5de658f | 2012-01-30 04:29:24 +0000 | [diff] [blame] | 257 | /* RFC5722, Section 4, amended by Errata ID : 3089 |
| 258 | * When reassembling an IPv6 datagram, if |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 259 | * one or more its constituent fragments is determined to be an |
| 260 | * overlapping fragment, the entire datagram (and any constituent |
Eric Dumazet | 5de658f | 2012-01-30 04:29:24 +0000 | [diff] [blame] | 261 | * fragments) MUST be silently discarded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 264 | /* Check for overlap with preceding fragment. */ |
| 265 | if (prev && |
Shan Wei | f464214 | 2010-11-05 01:56:34 +0000 | [diff] [blame] | 266 | (FRAG6_CB(prev)->offset + prev->len) > offset) |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 267 | goto discard_fq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 269 | /* Look for overlap with succeeding segment. */ |
| 270 | if (next && FRAG6_CB(next)->offset < end) |
| 271 | goto discard_fq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | FRAG6_CB(skb)->offset = offset; |
| 274 | |
| 275 | /* Insert this fragment in the chain of fragments. */ |
| 276 | skb->next = next; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 277 | if (!next) |
| 278 | fq->q.fragments_tail = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (prev) |
| 280 | prev->next = skb; |
| 281 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 282 | fq->q.fragments = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 284 | dev = skb->dev; |
| 285 | if (dev) { |
| 286 | fq->iif = dev->ifindex; |
| 287 | skb->dev = NULL; |
| 288 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 289 | fq->q.stamp = skb->tstamp; |
| 290 | fq->q.meat += skb->len; |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 291 | fq->ecn |= ecn; |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 292 | add_frag_mem_limit(fq->q.net, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | /* The first fragment. |
| 295 | * nhoffset is obtained from the first fragment, of course. |
| 296 | */ |
| 297 | if (offset == 0) { |
| 298 | fq->nhoffset = nhoff; |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 299 | fq->q.flags |= INET_FRAG_FIRST_IN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 301 | |
Nikolay Aleksandrov | 06aa8b8 | 2014-08-01 12:29:44 +0200 | [diff] [blame] | 302 | if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
Eric Dumazet | 97599dc | 2013-04-16 12:55:41 +0000 | [diff] [blame] | 303 | fq->q.meat == fq->q.len) { |
| 304 | int res; |
| 305 | unsigned long orefdst = skb->_skb_refdst; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 306 | |
Eric Dumazet | 97599dc | 2013-04-16 12:55:41 +0000 | [diff] [blame] | 307 | skb->_skb_refdst = 0UL; |
| 308 | res = ip6_frag_reasm(fq, prev, dev); |
| 309 | skb->_skb_refdst = orefdst; |
| 310 | return res; |
| 311 | } |
| 312 | |
| 313 | skb_dst_drop(skb); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 314 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Nicolas Dichtel | 70789d7 | 2010-09-03 05:13:05 +0000 | [diff] [blame] | 316 | discard_fq: |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 317 | inet_frag_kill(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | err: |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 319 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 320 | IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | kfree_skb(skb); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 322 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Check if this packet is complete. |
| 327 | * Returns NULL on failure by any reason, and pointer |
| 328 | * to current nexthdr field in reassembled frame. |
| 329 | * |
| 330 | * It is called with locked fq, and caller must check that |
| 331 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
| 332 | * the last and the first frames arrived and all the bits are here. |
| 333 | */ |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 334 | 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] | 335 | struct net_device *dev) |
| 336 | { |
Jorge Boncompte [DTI2] | 2bad35b | 2009-03-18 23:26:11 -0700 | [diff] [blame] | 337 | struct net *net = container_of(fq->q.net, struct net, ipv6.frags); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 338 | struct sk_buff *fp, *head = fq->q.fragments; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | int payload_len; |
| 340 | unsigned int nhoff; |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 341 | int sum_truesize; |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 342 | u8 ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 344 | inet_frag_kill(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 346 | ecn = ip_frag_ecn_table[fq->ecn]; |
| 347 | if (unlikely(ecn == 0xff)) |
| 348 | goto out_fail; |
| 349 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 350 | /* Make the one we just received the head. */ |
| 351 | if (prev) { |
| 352 | head = prev->next; |
| 353 | fp = skb_clone(head, GFP_ATOMIC); |
| 354 | |
| 355 | if (!fp) |
| 356 | goto out_oom; |
| 357 | |
| 358 | fp->next = head->next; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 359 | if (!fp->next) |
| 360 | fq->q.fragments_tail = fp; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 361 | prev->next = fp; |
| 362 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 363 | skb_morph(head, fq->q.fragments); |
| 364 | head->next = fq->q.fragments->next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 365 | |
Eric Dumazet | 808db80 | 2012-04-24 10:17:59 +0000 | [diff] [blame] | 366 | consume_skb(fq->q.fragments); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 367 | fq->q.fragments = head; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 370 | WARN_ON(head == NULL); |
| 371 | WARN_ON(FRAG6_CB(head)->offset != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | /* Unfragmented part is taken from the first segment. */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 374 | payload_len = ((head->data - skb_network_header(head)) - |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 375 | sizeof(struct ipv6hdr) + fq->q.len - |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 376 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | if (payload_len > IPV6_MAXPLEN) |
| 378 | goto out_oversize; |
| 379 | |
| 380 | /* Head of list must not be cloned. */ |
Pravin B Shelar | 14bbd6a | 2013-02-14 09:44:49 +0000 | [diff] [blame] | 381 | if (skb_unclone(head, GFP_ATOMIC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | goto out_oom; |
| 383 | |
| 384 | /* If the first fragment is fragmented itself, we split |
| 385 | * it to two chunks: the first with data and paged part |
| 386 | * and the second, holding only fragments. */ |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 387 | if (skb_has_frag_list(head)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | struct sk_buff *clone; |
| 389 | int i, plen = 0; |
| 390 | |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 391 | clone = alloc_skb(0, GFP_ATOMIC); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 392 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | goto out_oom; |
| 394 | clone->next = head->next; |
| 395 | head->next = clone; |
| 396 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 397 | skb_frag_list_init(head); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 398 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) |
| 399 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | clone->len = clone->data_len = head->data_len - plen; |
| 401 | head->data_len -= clone->len; |
| 402 | head->len -= clone->len; |
| 403 | clone->csum = 0; |
| 404 | clone->ip_summed = head->ip_summed; |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 405 | add_frag_mem_limit(fq->q.net, clone->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* We have to remove fragment header from datagram and to relocate |
| 409 | * header in order to calculate ICV correctly. */ |
| 410 | nhoff = fq->nhoffset; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 411 | skb_network_header(head)[nhoff] = skb_transport_header(head)[0]; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 412 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | (head->data - head->head) - sizeof(struct frag_hdr)); |
Jason A. Donenfeld | b678aa5 | 2016-10-21 18:28:25 +0900 | [diff] [blame] | 414 | if (skb_mac_header_was_set(head)) |
| 415 | head->mac_header += sizeof(struct frag_hdr); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 416 | head->network_header += sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 418 | skb_reset_transport_header(head); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 419 | skb_push(head, head->data - skb_network_header(head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 421 | sum_truesize = head->truesize; |
| 422 | for (fp = head->next; fp;) { |
| 423 | bool headstolen; |
| 424 | int delta; |
| 425 | struct sk_buff *next = fp->next; |
| 426 | |
| 427 | sum_truesize += fp->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (head->ip_summed != fp->ip_summed) |
| 429 | head->ip_summed = CHECKSUM_NONE; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 430 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | head->csum = csum_add(head->csum, fp->csum); |
Eric Dumazet | ec16439 | 2012-05-19 03:02:35 +0000 | [diff] [blame] | 432 | |
| 433 | if (skb_try_coalesce(head, fp, &headstolen, &delta)) { |
| 434 | kfree_skb_partial(fp, headstolen); |
| 435 | } else { |
| 436 | if (!skb_shinfo(head)->frag_list) |
| 437 | skb_shinfo(head)->frag_list = fp; |
| 438 | head->data_len += fp->len; |
| 439 | head->len += fp->len; |
| 440 | head->truesize += fp->truesize; |
| 441 | } |
| 442 | fp = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
Florian Westphal | 0e60d24 | 2015-07-23 12:05:38 +0200 | [diff] [blame] | 444 | sub_frag_mem_limit(fq->q.net, sum_truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | head->next = NULL; |
| 447 | head->dev = dev; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 448 | head->tstamp = fq->q.stamp; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 449 | ipv6_hdr(head)->payload_len = htons(payload_len); |
Hannes Frederic Sowa | eec2e61 | 2013-03-22 08:24:44 +0000 | [diff] [blame] | 450 | ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 451 | IP6CB(head)->nhoff = nhoff; |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 452 | IP6CB(head)->flags |= IP6SKB_FRAGMENTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | /* Yes, and fold redundant checksum back. 8) */ |
Daniel Borkmann | 6b83d28 | 2016-02-20 00:29:30 +0100 | [diff] [blame] | 455 | skb_postpush_rcsum(head, skb_network_header(head), |
| 456 | skb_network_header_len(head)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 458 | rcu_read_lock(); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 459 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 460 | rcu_read_unlock(); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 461 | fq->q.fragments = NULL; |
Changli Gao | d6bebca | 2010-06-29 04:39:37 +0000 | [diff] [blame] | 462 | fq->q.fragments_tail = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return 1; |
| 464 | |
| 465 | out_oversize: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 466 | net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | goto out_fail; |
| 468 | out_oom: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 469 | net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | out_fail: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 471 | rcu_read_lock(); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 472 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 473 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return -1; |
| 475 | } |
| 476 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 477 | static int ipv6_frag_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | struct frag_hdr *fhdr; |
| 480 | struct frag_queue *fq; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 481 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 482 | struct net *net = dev_net(skb_dst(skb)->dev); |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 483 | int iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 485 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED) |
| 486 | goto fail_hdr; |
| 487 | |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 488 | __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] | 489 | |
| 490 | /* Jumbo payload inhibits frag. header */ |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 491 | if (hdr->payload_len == 0) |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 492 | goto fail_hdr; |
| 493 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 494 | if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 495 | sizeof(struct frag_hdr)))) |
| 496 | goto fail_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 498 | hdr = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 499 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | if (!(fhdr->frag_off & htons(0xFFF9))) { |
| 502 | /* It is not a fragmented frame */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 503 | skb->transport_header += sizeof(struct frag_hdr); |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 504 | __IP6_INC_STATS(net, |
| 505 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 507 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
Hannes Frederic Sowa | f46078c | 2013-08-16 13:30:07 +0200 | [diff] [blame] | 508 | IP6CB(skb)->flags |= IP6SKB_FRAGMENTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return 1; |
| 510 | } |
| 511 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 512 | iif = skb->dev ? skb->dev->ifindex : 0; |
| 513 | fq = fq_find(net, fhdr->identification, hdr, iif); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 514 | if (fq) { |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 515 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 517 | spin_lock(&fq->q.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 519 | fq->iif = iif; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 520 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 522 | spin_unlock(&fq->q.lock); |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 523 | inet_frag_put(&fq->q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | return ret; |
| 525 | } |
| 526 | |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 527 | __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] | 528 | kfree_skb(skb); |
| 529 | return -1; |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 530 | |
| 531 | fail_hdr: |
Eric Dumazet | 1d01550 | 2016-04-27 16:44:40 -0700 | [diff] [blame] | 532 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| 533 | IPSTATS_MIB_INHDRERRORS); |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 534 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
| 535 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Ian Morris | cc24bec | 2014-08-24 21:53:11 +0100 | [diff] [blame] | 538 | static const struct inet6_protocol frag_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | .handler = ipv6_frag_rcv, |
| 540 | .flags = INET6_PROTO_NOPOLICY, |
| 541 | }; |
| 542 | |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 543 | #ifdef CONFIG_SYSCTL |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 544 | static int zero; |
| 545 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 546 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 547 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 548 | .procname = "ip6frag_high_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 549 | .data = &init_net.ipv6.frags.high_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 550 | .maxlen = sizeof(int), |
| 551 | .mode = 0644, |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 552 | .proc_handler = proc_dointvec_minmax, |
| 553 | .extra1 = &init_net.ipv6.frags.low_thresh |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 554 | }, |
| 555 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 556 | .procname = "ip6frag_low_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 557 | .data = &init_net.ipv6.frags.low_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 558 | .maxlen = sizeof(int), |
| 559 | .mode = 0644, |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 560 | .proc_handler = proc_dointvec_minmax, |
| 561 | .extra1 = &zero, |
| 562 | .extra2 = &init_net.ipv6.frags.high_thresh |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 563 | }, |
| 564 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 565 | .procname = "ip6frag_time", |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 566 | .data = &init_net.ipv6.frags.timeout, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 567 | .maxlen = sizeof(int), |
| 568 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 569 | .proc_handler = proc_dointvec_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 570 | }, |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 571 | { } |
| 572 | }; |
| 573 | |
Florian Westphal | e3a57d1 | 2014-07-24 16:50:35 +0200 | [diff] [blame] | 574 | /* secret interval has been deprecated */ |
| 575 | static int ip6_frags_secret_interval_unused; |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 576 | static struct ctl_table ip6_frags_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 577 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 578 | .procname = "ip6frag_secret_interval", |
Florian Westphal | e3a57d1 | 2014-07-24 16:50:35 +0200 | [diff] [blame] | 579 | .data = &ip6_frags_secret_interval_unused, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 580 | .maxlen = sizeof(int), |
| 581 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 582 | .proc_handler = proc_dointvec_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 583 | }, |
| 584 | { } |
| 585 | }; |
Daniel Lezcano | 7d460db | 2008-01-18 23:52:35 -0800 | [diff] [blame] | 586 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 587 | static int __net_init ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 588 | { |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 589 | struct ctl_table *table; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 590 | struct ctl_table_header *hdr; |
| 591 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 592 | table = ip6_frags_ns_ctl_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 593 | if (!net_eq(net, &init_net)) { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 594 | table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 595 | if (!table) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 596 | goto err_alloc; |
| 597 | |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 598 | table[0].data = &net->ipv6.frags.high_thresh; |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 599 | table[0].extra1 = &net->ipv6.frags.low_thresh; |
| 600 | table[0].extra2 = &init_net.ipv6.frags.high_thresh; |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 601 | table[1].data = &net->ipv6.frags.low_thresh; |
Nikolay Aleksandrov | 1bab4c7 | 2014-07-24 16:50:37 +0200 | [diff] [blame] | 602 | table[1].extra2 = &net->ipv6.frags.high_thresh; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 603 | table[2].data = &net->ipv6.frags.timeout; |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 604 | } |
| 605 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 606 | hdr = register_net_sysctl(net, "net/ipv6", table); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 607 | if (!hdr) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 608 | goto err_reg; |
| 609 | |
| 610 | net->ipv6.sysctl.frags_hdr = hdr; |
| 611 | return 0; |
| 612 | |
| 613 | err_reg: |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 614 | if (!net_eq(net, &init_net)) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 615 | kfree(table); |
| 616 | err_alloc: |
| 617 | return -ENOMEM; |
| 618 | } |
| 619 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 620 | static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 621 | { |
| 622 | struct ctl_table *table; |
| 623 | |
| 624 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; |
| 625 | unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); |
Yang Hongyang | 3705e11 | 2009-12-18 20:25:13 -0800 | [diff] [blame] | 626 | if (!net_eq(net, &init_net)) |
| 627 | kfree(table); |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 628 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 629 | |
| 630 | static struct ctl_table_header *ip6_ctl_header; |
| 631 | |
| 632 | static int ip6_frags_sysctl_register(void) |
| 633 | { |
Eric W. Biederman | 4344475 | 2012-04-19 13:22:55 +0000 | [diff] [blame] | 634 | ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6", |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 635 | ip6_frags_ctl_table); |
| 636 | return ip6_ctl_header == NULL ? -ENOMEM : 0; |
| 637 | } |
| 638 | |
| 639 | static void ip6_frags_sysctl_unregister(void) |
| 640 | { |
| 641 | unregister_net_sysctl_table(ip6_ctl_header); |
| 642 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 643 | #else |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 644 | static int ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 645 | { |
| 646 | return 0; |
| 647 | } |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 648 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 649 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 650 | { |
| 651 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 652 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 653 | static int ip6_frags_sysctl_register(void) |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 654 | { |
| 655 | return 0; |
| 656 | } |
| 657 | |
Fabian Frederick | fc08c25 | 2014-10-29 11:38:17 +0100 | [diff] [blame] | 658 | static void ip6_frags_sysctl_unregister(void) |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 659 | { |
| 660 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 661 | #endif |
| 662 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 663 | static int __net_init ipv6_frags_init_net(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 664 | { |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 665 | int res; |
| 666 | |
Shan Wei | 7c070aa | 2010-01-20 10:42:41 +0100 | [diff] [blame] | 667 | net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
| 668 | net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 669 | net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT; |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 670 | net->ipv6.frags.f = &ip6_frags; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 671 | |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 672 | res = inet_frags_init_net(&net->ipv6.frags); |
| 673 | if (res < 0) |
| 674 | return res; |
Jesper Dangaard Brouer | 1bcf187 | 2017-09-01 11:26:13 +0200 | [diff] [blame] | 675 | |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 676 | res = ip6_frags_ns_sysctl_register(net); |
| 677 | if (res < 0) |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 678 | inet_frags_exit_net(&net->ipv6.frags); |
Eric Dumazet | 7fca771 | 2018-10-10 12:29:49 -0700 | [diff] [blame] | 679 | return res; |
Daniel Lezcano | e71e034 | 2008-01-10 02:56:03 -0800 | [diff] [blame] | 680 | } |
| 681 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 682 | static void __net_exit ipv6_frags_exit_net(struct net *net) |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 683 | { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 684 | ip6_frags_ns_sysctl_unregister(net); |
Eric Dumazet | 2ffb1c3 | 2018-10-10 12:29:50 -0700 | [diff] [blame] | 685 | inet_frags_exit_net(&net->ipv6.frags); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 686 | } |
| 687 | |
| 688 | static struct pernet_operations ip6_frags_ops = { |
| 689 | .init = ipv6_frags_init_net, |
| 690 | .exit = ipv6_frags_exit_net, |
| 691 | }; |
| 692 | |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 693 | static u32 ip6_key_hashfn(const void *data, u32 len, u32 seed) |
| 694 | { |
| 695 | return jhash2(data, |
| 696 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); |
| 697 | } |
| 698 | |
| 699 | static u32 ip6_obj_hashfn(const void *data, u32 len, u32 seed) |
| 700 | { |
| 701 | const struct inet_frag_queue *fq = data; |
| 702 | |
| 703 | return jhash2((const u32 *)&fq->key.v6, |
| 704 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); |
| 705 | } |
| 706 | |
| 707 | static int ip6_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) |
| 708 | { |
| 709 | const struct frag_v6_compare_key *key = arg->key; |
| 710 | const struct inet_frag_queue *fq = ptr; |
| 711 | |
| 712 | return !!memcmp(&fq->key, key, sizeof(*key)); |
| 713 | } |
| 714 | |
| 715 | const struct rhashtable_params ip6_rhash_params = { |
| 716 | .head_offset = offsetof(struct inet_frag_queue, node), |
| 717 | .hashfn = ip6_key_hashfn, |
| 718 | .obj_hashfn = ip6_obj_hashfn, |
| 719 | .obj_cmpfn = ip6_obj_cmpfn, |
| 720 | .automatic_shrinking = true, |
| 721 | }; |
| 722 | EXPORT_SYMBOL(ip6_rhash_params); |
| 723 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 724 | int __init ipv6_frag_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 726 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 728 | ip6_frags.constructor = ip6_frag_init; |
Pavel Emelyanov | c954770 | 2007-10-17 19:48:26 -0700 | [diff] [blame] | 729 | ip6_frags.destructor = NULL; |
Pavel Emelyanov | 1e4b828 | 2007-10-15 02:39:14 -0700 | [diff] [blame] | 730 | ip6_frags.qsize = sizeof(struct frag_queue); |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 731 | ip6_frags.frag_expire = ip6_frag_expire; |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 732 | ip6_frags.frags_cache_name = ip6_frag_cache_name; |
Eric Dumazet | 23ce9c5 | 2018-10-10 12:29:56 -0700 | [diff] [blame] | 733 | ip6_frags.rhash_params = ip6_rhash_params; |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 734 | ret = inet_frags_init(&ip6_frags); |
| 735 | if (ret) |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 736 | goto out; |
| 737 | |
| 738 | ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| 739 | if (ret) |
| 740 | goto err_protocol; |
| 741 | |
| 742 | ret = ip6_frags_sysctl_register(); |
| 743 | if (ret) |
| 744 | goto err_sysctl; |
| 745 | |
| 746 | ret = register_pernet_subsys(&ip6_frags_ops); |
| 747 | if (ret) |
Nikolay Aleksandrov | d4ad4d2 | 2014-08-01 12:29:48 +0200 | [diff] [blame] | 748 | goto err_pernet; |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 749 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 750 | out: |
| 751 | return ret; |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 752 | |
| 753 | err_pernet: |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 754 | ip6_frags_sysctl_unregister(); |
| 755 | err_sysctl: |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 756 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
Eric Dumazet | dae73e7 | 2018-10-10 12:29:52 -0700 | [diff] [blame] | 757 | err_protocol: |
| 758 | inet_frags_fini(&ip6_frags); |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 759 | goto out; |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | void ipv6_frag_exit(void) |
| 763 | { |
| 764 | inet_frags_fini(&ip6_frags); |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 765 | ip6_frags_sysctl_unregister(); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 766 | unregister_pernet_subsys(&ip6_frags_ops); |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 767 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |