Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 fragment reassembly for connection tracking |
| 3 | * |
| 4 | * Copyright (C)2004 USAGI/WIDE Project |
| 5 | * |
| 6 | * Author: |
| 7 | * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| 8 | * |
| 9 | * Based on: net/ipv6/reassembly.c |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | */ |
| 16 | |
Hannes Frederic Sowa | 5a3da1f | 2013-03-15 11:32:30 +0000 | [diff] [blame] | 17 | #define pr_fmt(fmt) "IPv6-nf: " fmt |
| 18 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 19 | #include <linux/errno.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/socket.h> |
| 23 | #include <linux/sockios.h> |
| 24 | #include <linux/jiffies.h> |
| 25 | #include <linux/net.h> |
| 26 | #include <linux/list.h> |
| 27 | #include <linux/netdevice.h> |
| 28 | #include <linux/in6.h> |
| 29 | #include <linux/ipv6.h> |
| 30 | #include <linux/icmpv6.h> |
| 31 | #include <linux/random.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 33 | |
| 34 | #include <net/sock.h> |
| 35 | #include <net/snmp.h> |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 36 | #include <net/inet_frag.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 37 | |
| 38 | #include <net/ipv6.h> |
| 39 | #include <net/protocol.h> |
| 40 | #include <net/transp_v6.h> |
| 41 | #include <net/rawv6.h> |
| 42 | #include <net/ndisc.h> |
| 43 | #include <net/addrconf.h> |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 44 | #include <net/inet_ecn.h> |
Patrick McHardy | 99fa5f5 | 2008-01-31 04:10:40 -0800 | [diff] [blame] | 45 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 46 | #include <linux/sysctl.h> |
| 47 | #include <linux/netfilter.h> |
| 48 | #include <linux/netfilter_ipv6.h> |
| 49 | #include <linux/kernel.h> |
| 50 | #include <linux/module.h> |
Eric Dumazet | bced94e | 2011-01-20 21:00:38 +0100 | [diff] [blame] | 51 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 52 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 53 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 54 | struct nf_ct_frag6_skb_cb |
| 55 | { |
| 56 | struct inet6_skb_parm h; |
| 57 | int offset; |
| 58 | struct sk_buff *orig; |
| 59 | }; |
| 60 | |
| 61 | #define NFCT_FRAG6_CB(skb) ((struct nf_ct_frag6_skb_cb*)((skb)->cb)) |
| 62 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 63 | static struct inet_frags nf_frags; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 64 | |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 65 | #ifdef CONFIG_SYSCTL |
Eric Dumazet | be9e916 | 2010-11-15 18:18:29 +0100 | [diff] [blame] | 66 | static struct ctl_table nf_ct_frag6_sysctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 67 | { |
| 68 | .procname = "nf_conntrack_frag6_timeout", |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 69 | .data = &init_net.nf_frag.frags.timeout, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 70 | .maxlen = sizeof(unsigned int), |
| 71 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 72 | .proc_handler = proc_dointvec_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 73 | }, |
| 74 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 75 | .procname = "nf_conntrack_frag6_low_thresh", |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 76 | .data = &init_net.nf_frag.frags.low_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 77 | .maxlen = sizeof(unsigned int), |
| 78 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 79 | .proc_handler = proc_dointvec, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 80 | }, |
| 81 | { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 82 | .procname = "nf_conntrack_frag6_high_thresh", |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 83 | .data = &init_net.nf_frag.frags.high_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 84 | .maxlen = sizeof(unsigned int), |
| 85 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 86 | .proc_handler = proc_dointvec, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 87 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 88 | { } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 89 | }; |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 90 | |
Hein Tibosch | f1df137 | 2012-10-26 23:49:26 +0000 | [diff] [blame] | 91 | static int nf_ct_frag6_sysctl_register(struct net *net) |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 92 | { |
| 93 | struct ctl_table *table; |
| 94 | struct ctl_table_header *hdr; |
| 95 | |
| 96 | table = nf_ct_frag6_sysctl_table; |
| 97 | if (!net_eq(net, &init_net)) { |
| 98 | table = kmemdup(table, sizeof(nf_ct_frag6_sysctl_table), |
| 99 | GFP_KERNEL); |
| 100 | if (table == NULL) |
| 101 | goto err_alloc; |
| 102 | |
Michal Kubeček | 894e2ac | 2013-02-12 23:46:09 +0000 | [diff] [blame] | 103 | table[0].data = &net->nf_frag.frags.timeout; |
| 104 | table[1].data = &net->nf_frag.frags.low_thresh; |
| 105 | table[2].data = &net->nf_frag.frags.high_thresh; |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | hdr = register_net_sysctl(net, "net/netfilter", table); |
| 109 | if (hdr == NULL) |
| 110 | goto err_reg; |
| 111 | |
Konstantin Khlebnikov | 4b7cc7f | 2012-09-25 06:07:50 +0000 | [diff] [blame] | 112 | net->nf_frag.sysctl.frags_hdr = hdr; |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 113 | return 0; |
| 114 | |
| 115 | err_reg: |
| 116 | if (!net_eq(net, &init_net)) |
| 117 | kfree(table); |
| 118 | err_alloc: |
| 119 | return -ENOMEM; |
| 120 | } |
| 121 | |
| 122 | static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net) |
| 123 | { |
| 124 | struct ctl_table *table; |
| 125 | |
| 126 | table = net->nf_frag.sysctl.frags_hdr->ctl_table_arg; |
| 127 | unregister_net_sysctl_table(net->nf_frag.sysctl.frags_hdr); |
| 128 | if (!net_eq(net, &init_net)) |
| 129 | kfree(table); |
| 130 | } |
| 131 | |
| 132 | #else |
Hein Tibosch | f1df137 | 2012-10-26 23:49:26 +0000 | [diff] [blame] | 133 | static int nf_ct_frag6_sysctl_register(struct net *net) |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 134 | { |
| 135 | return 0; |
| 136 | } |
| 137 | static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net) |
| 138 | { |
| 139 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 140 | #endif |
| 141 | |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 142 | static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) |
| 143 | { |
| 144 | return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); |
| 145 | } |
| 146 | |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 147 | static unsigned int nf_hashfn(struct inet_frag_queue *q) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 148 | { |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 149 | const struct frag_queue *nq; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 150 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 151 | nq = container_of(q, struct frag_queue, q); |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 152 | return inet6_hash_frag(nq->id, &nq->saddr, &nq->daddr, nf_frags.rnd); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 153 | } |
| 154 | |
Pavel Emelyanov | 1e4b828 | 2007-10-15 02:39:14 -0700 | [diff] [blame] | 155 | static void nf_skb_free(struct sk_buff *skb) |
| 156 | { |
| 157 | if (NFCT_FRAG6_CB(skb)->orig) |
| 158 | kfree_skb(NFCT_FRAG6_CB(skb)->orig); |
| 159 | } |
| 160 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 161 | static void nf_ct_frag6_expire(unsigned long data) |
| 162 | { |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 163 | struct frag_queue *fq; |
| 164 | struct net *net; |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 165 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 166 | fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q); |
| 167 | net = container_of(fq->q.net, struct net, nf_frag.frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 168 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 169 | ip6_expire_frag_queue(net, fq, &nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | /* Creation primitives. */ |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 173 | static inline struct frag_queue *fq_find(struct net *net, __be32 id, |
| 174 | u32 user, struct in6_addr *src, |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 175 | struct in6_addr *dst, u8 ecn) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 176 | { |
Pavel Emelyanov | 2588fe1 | 2007-10-17 19:44:34 -0700 | [diff] [blame] | 177 | struct inet_frag_queue *q; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 178 | struct ip6_create_arg arg; |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 179 | unsigned int hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 180 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 181 | arg.id = id; |
Patrick McHardy | 0b5ccb2 | 2009-12-15 16:59:18 +0100 | [diff] [blame] | 182 | arg.user = user; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 183 | arg.src = src; |
| 184 | arg.dst = dst; |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 185 | arg.ecn = ecn; |
Pavel Emelyanov | 9a37580 | 2008-06-27 20:06:08 -0700 | [diff] [blame] | 186 | |
| 187 | read_lock_bh(&nf_frags.lock); |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 188 | hash = inet6_hash_frag(id, src, dst, nf_frags.rnd); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 189 | |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 190 | q = inet_frag_find(&net->nf_frag.frags, &nf_frags, &arg, hash); |
Jarek Poplawski | b9c6989 | 2008-06-04 09:58:27 -0700 | [diff] [blame] | 191 | local_bh_enable(); |
Hannes Frederic Sowa | 5a3da1f | 2013-03-15 11:32:30 +0000 | [diff] [blame] | 192 | if (IS_ERR_OR_NULL(q)) { |
| 193 | inet_frag_maybe_warn_overflow(q, pr_fmt()); |
| 194 | return NULL; |
| 195 | } |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 196 | return container_of(q, struct frag_queue, q); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 197 | } |
| 198 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 199 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 200 | static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb, |
Jan Engelhardt | 58c0fb0 | 2008-04-14 11:15:42 +0200 | [diff] [blame] | 201 | const struct frag_hdr *fhdr, int nhoff) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 202 | { |
| 203 | struct sk_buff *prev, *next; |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 204 | unsigned int payload_len; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 205 | int offset, end; |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 206 | u8 ecn; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 207 | |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 208 | if (fq->q.last_in & INET_FRAG_COMPLETE) { |
Uwe Kleine-König | 698f931 | 2010-07-02 20:41:51 +0200 | [diff] [blame] | 209 | pr_debug("Already completed\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 210 | goto err; |
| 211 | } |
| 212 | |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 213 | payload_len = ntohs(ipv6_hdr(skb)->payload_len); |
| 214 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 215 | offset = ntohs(fhdr->frag_off) & ~0x7; |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 216 | end = offset + (payload_len - |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 217 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 218 | |
| 219 | if ((unsigned int)end > IPV6_MAXPLEN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 220 | pr_debug("offset is too large.\n"); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 221 | return -1; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 222 | } |
| 223 | |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 224 | ecn = ip6_frag_ecn(ipv6_hdr(skb)); |
| 225 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 226 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 227 | const unsigned char *nh = skb_network_header(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 228 | skb->csum = csum_sub(skb->csum, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 229 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 230 | 0)); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 231 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 232 | |
| 233 | /* Is this the final fragment? */ |
| 234 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
| 235 | /* If we already have some bits beyond end |
| 236 | * or have different end, the segment is corrupted. |
| 237 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 238 | if (end < fq->q.len || |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 239 | ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 240 | pr_debug("already received last fragment\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 241 | goto err; |
| 242 | } |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 243 | fq->q.last_in |= INET_FRAG_LAST_IN; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 244 | fq->q.len = end; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 245 | } else { |
| 246 | /* Check if the fragment is rounded to 8 bytes. |
| 247 | * Required by the RFC. |
| 248 | */ |
| 249 | if (end & 0x7) { |
| 250 | /* RFC2460 says always send parameter problem in |
| 251 | * this case. -DaveM |
| 252 | */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 253 | pr_debug("end of fragment not rounded to 8 bytes.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 254 | return -1; |
| 255 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 256 | if (end > fq->q.len) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 257 | /* Some bits beyond end -> corruption. */ |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 258 | if (fq->q.last_in & INET_FRAG_LAST_IN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 259 | pr_debug("last packet already reached.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 260 | goto err; |
| 261 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 262 | fq->q.len = end; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 263 | } |
| 264 | } |
| 265 | |
| 266 | if (end == offset) |
| 267 | goto err; |
| 268 | |
| 269 | /* Point into the IP datagram 'data' part. */ |
| 270 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 271 | pr_debug("queue: message is too short.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 272 | goto err; |
| 273 | } |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 274 | if (pskb_trim_rcsum(skb, end - offset)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 275 | pr_debug("Can't trim\n"); |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 276 | goto err; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | /* Find out which fragments are in front and at the back of us |
| 280 | * in the chain of fragments so far. We must know where to put |
| 281 | * this fragment, right? |
| 282 | */ |
Changli Gao | ea8fbe8 | 2010-07-05 10:38:23 +0200 | [diff] [blame] | 283 | prev = fq->q.fragments_tail; |
| 284 | if (!prev || NFCT_FRAG6_CB(prev)->offset < offset) { |
| 285 | next = NULL; |
| 286 | goto found; |
| 287 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 288 | prev = NULL; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 289 | for (next = fq->q.fragments; next != NULL; next = next->next) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 290 | if (NFCT_FRAG6_CB(next)->offset >= offset) |
| 291 | break; /* bingo! */ |
| 292 | prev = next; |
| 293 | } |
| 294 | |
Changli Gao | ea8fbe8 | 2010-07-05 10:38:23 +0200 | [diff] [blame] | 295 | found: |
Nicolas Dichtel | 1ee89bd | 2010-09-03 05:13:07 +0000 | [diff] [blame] | 296 | /* RFC5722, Section 4: |
| 297 | * When reassembling an IPv6 datagram, if |
| 298 | * one or more its constituent fragments is determined to be an |
| 299 | * overlapping fragment, the entire datagram (and any constituent |
| 300 | * fragments, including those not yet received) MUST be silently |
| 301 | * discarded. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 302 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 303 | |
Nicolas Dichtel | 1ee89bd | 2010-09-03 05:13:07 +0000 | [diff] [blame] | 304 | /* Check for overlap with preceding fragment. */ |
| 305 | if (prev && |
Shan Wei | 22e091e | 2010-11-12 08:51:55 +0100 | [diff] [blame] | 306 | (NFCT_FRAG6_CB(prev)->offset + prev->len) > offset) |
Nicolas Dichtel | 1ee89bd | 2010-09-03 05:13:07 +0000 | [diff] [blame] | 307 | goto discard_fq; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 308 | |
Nicolas Dichtel | 1ee89bd | 2010-09-03 05:13:07 +0000 | [diff] [blame] | 309 | /* Look for overlap with succeeding segment. */ |
| 310 | if (next && NFCT_FRAG6_CB(next)->offset < end) |
| 311 | goto discard_fq; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 312 | |
| 313 | NFCT_FRAG6_CB(skb)->offset = offset; |
| 314 | |
| 315 | /* Insert this fragment in the chain of fragments. */ |
| 316 | skb->next = next; |
Changli Gao | ea8fbe8 | 2010-07-05 10:38:23 +0200 | [diff] [blame] | 317 | if (!next) |
| 318 | fq->q.fragments_tail = skb; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 319 | if (prev) |
| 320 | prev->next = skb; |
| 321 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 322 | fq->q.fragments = skb; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 323 | |
Haibo Xi | 97cf00e | 2012-12-06 23:42:17 +0000 | [diff] [blame] | 324 | if (skb->dev) { |
| 325 | fq->iif = skb->dev->ifindex; |
| 326 | skb->dev = NULL; |
| 327 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 328 | fq->q.stamp = skb->tstamp; |
| 329 | fq->q.meat += skb->len; |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 330 | fq->ecn |= ecn; |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 331 | if (payload_len > fq->q.max_size) |
| 332 | fq->q.max_size = payload_len; |
Jesper Dangaard Brouer | d433673 | 2013-01-28 23:45:12 +0000 | [diff] [blame] | 333 | add_frag_mem_limit(&fq->q, skb->truesize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 334 | |
| 335 | /* The first fragment. |
| 336 | * nhoffset is obtained from the first fragment, of course. |
| 337 | */ |
| 338 | if (offset == 0) { |
| 339 | fq->nhoffset = nhoff; |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 340 | fq->q.last_in |= INET_FRAG_FIRST_IN; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 341 | } |
Jesper Dangaard Brouer | 3ef0eb0 | 2013-01-28 23:45:51 +0000 | [diff] [blame] | 342 | |
| 343 | inet_frag_lru_move(&fq->q); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 344 | return 0; |
| 345 | |
Nicolas Dichtel | 1ee89bd | 2010-09-03 05:13:07 +0000 | [diff] [blame] | 346 | discard_fq: |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 347 | inet_frag_kill(&fq->q, &nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 348 | err: |
| 349 | return -1; |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Check if this packet is complete. |
| 354 | * Returns NULL on failure by any reason, and pointer |
| 355 | * to current nexthdr field in reassembled frame. |
| 356 | * |
| 357 | * It is called with locked fq, and caller must check that |
| 358 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
| 359 | * the last and the first frames arrived and all the bits are here. |
| 360 | */ |
| 361 | static struct sk_buff * |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 362 | nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 363 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 364 | struct sk_buff *fp, *op, *head = fq->q.fragments; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 365 | int payload_len; |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 366 | u8 ecn; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 367 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 368 | inet_frag_kill(&fq->q, &nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 369 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 370 | WARN_ON(head == NULL); |
| 371 | WARN_ON(NFCT_FRAG6_CB(head)->offset != 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 372 | |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 373 | ecn = ip_frag_ecn_table[fq->ecn]; |
| 374 | if (unlikely(ecn == 0xff)) |
| 375 | goto out_fail; |
| 376 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 377 | /* Unfragmented part is taken from the first segment. */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 378 | payload_len = ((head->data - skb_network_header(head)) - |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 379 | sizeof(struct ipv6hdr) + fq->q.len - |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 380 | sizeof(struct frag_hdr)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 381 | if (payload_len > IPV6_MAXPLEN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 382 | pr_debug("payload len is too large.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 383 | goto out_oversize; |
| 384 | } |
| 385 | |
| 386 | /* Head of list must not be cloned. */ |
Pravin B Shelar | 14bbd6a | 2013-02-14 09:44:49 +0000 | [diff] [blame] | 387 | if (skb_unclone(head, GFP_ATOMIC)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 388 | pr_debug("skb is cloned but can't expand head"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 389 | goto out_oom; |
| 390 | } |
| 391 | |
| 392 | /* If the first fragment is fragmented itself, we split |
| 393 | * it to two chunks: the first with data and paged part |
| 394 | * and the second, holding only fragments. */ |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 395 | if (skb_has_frag_list(head)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 396 | struct sk_buff *clone; |
| 397 | int i, plen = 0; |
| 398 | |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 399 | clone = alloc_skb(0, GFP_ATOMIC); |
| 400 | if (clone == NULL) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 401 | goto out_oom; |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 402 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 403 | clone->next = head->next; |
| 404 | head->next = clone; |
| 405 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
David S. Miller | 343a997 | 2009-06-09 00:23:58 -0700 | [diff] [blame] | 406 | skb_frag_list_init(head); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 407 | for (i = 0; i < skb_shinfo(head)->nr_frags; i++) |
| 408 | plen += skb_frag_size(&skb_shinfo(head)->frags[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 409 | clone->len = clone->data_len = head->data_len - plen; |
| 410 | head->data_len -= clone->len; |
| 411 | head->len -= clone->len; |
| 412 | clone->csum = 0; |
| 413 | clone->ip_summed = head->ip_summed; |
| 414 | |
| 415 | NFCT_FRAG6_CB(clone)->orig = NULL; |
Jesper Dangaard Brouer | d433673 | 2013-01-28 23:45:12 +0000 | [diff] [blame] | 416 | add_frag_mem_limit(&fq->q, clone->truesize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* We have to remove fragment header from datagram and to relocate |
| 420 | * header in order to calculate ICV correctly. */ |
Arnaldo Carvalho de Melo | bff9b61 | 2007-03-16 17:19:57 -0300 | [diff] [blame] | 421 | skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0]; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 422 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 423 | (head->data - head->head) - sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 424 | head->mac_header += sizeof(struct frag_hdr); |
| 425 | head->network_header += sizeof(struct frag_hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 426 | |
| 427 | skb_shinfo(head)->frag_list = head->next; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 428 | skb_reset_transport_header(head); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 429 | skb_push(head, head->data - skb_network_header(head)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | |
| 431 | for (fp=head->next; fp; fp = fp->next) { |
| 432 | head->data_len += fp->len; |
| 433 | head->len += fp->len; |
| 434 | if (head->ip_summed != fp->ip_summed) |
| 435 | head->ip_summed = CHECKSUM_NONE; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 436 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 437 | head->csum = csum_add(head->csum, fp->csum); |
| 438 | head->truesize += fp->truesize; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 439 | } |
Jesper Dangaard Brouer | d433673 | 2013-01-28 23:45:12 +0000 | [diff] [blame] | 440 | sub_frag_mem_limit(&fq->q, head->truesize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 441 | |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 442 | head->local_df = 1; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 443 | head->next = NULL; |
| 444 | head->dev = dev; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 445 | head->tstamp = fq->q.stamp; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 446 | ipv6_hdr(head)->payload_len = htons(payload_len); |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 447 | ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn); |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 448 | IP6CB(head)->frag_max_size = sizeof(struct ipv6hdr) + fq->q.max_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 449 | |
| 450 | /* Yes, and fold redundant checksum back. 8) */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 451 | if (head->ip_summed == CHECKSUM_COMPLETE) |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 452 | head->csum = csum_partial(skb_network_header(head), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 453 | skb_network_header_len(head), |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 454 | head->csum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 456 | fq->q.fragments = NULL; |
Changli Gao | ea8fbe8 | 2010-07-05 10:38:23 +0200 | [diff] [blame] | 457 | fq->q.fragments_tail = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 458 | |
| 459 | /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */ |
| 460 | fp = skb_shinfo(head)->frag_list; |
Patrick McHardy | 9e2dcf7 | 2010-02-19 18:18:37 +0100 | [diff] [blame] | 461 | if (fp && NFCT_FRAG6_CB(fp)->orig == NULL) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 462 | /* at above code, head skb is divided into two skbs. */ |
| 463 | fp = fp->next; |
| 464 | |
| 465 | op = NFCT_FRAG6_CB(head)->orig; |
| 466 | for (; fp; fp = fp->next) { |
| 467 | struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig; |
| 468 | |
| 469 | op->next = orig; |
| 470 | op = orig; |
| 471 | NFCT_FRAG6_CB(fp)->orig = NULL; |
| 472 | } |
| 473 | |
| 474 | return head; |
| 475 | |
| 476 | out_oversize: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 477 | net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n", |
| 478 | payload_len); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 479 | goto out_fail; |
| 480 | out_oom: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 481 | net_dbg_ratelimited("nf_ct_frag6_reasm: no memory for reassembly\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 482 | out_fail: |
| 483 | return NULL; |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * find the header just before Fragment Header. |
| 488 | * |
| 489 | * if success return 0 and set ... |
| 490 | * (*prevhdrp): the value of "Next Header Field" in the header |
| 491 | * just before Fragment Header. |
| 492 | * (*prevhoff): the offset of "Next Header Field" in the header |
| 493 | * just before Fragment Header. |
| 494 | * (*fhoff) : the offset of Fragment Header. |
| 495 | * |
| 496 | * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c |
| 497 | * |
| 498 | */ |
| 499 | static int |
| 500 | find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff) |
| 501 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 502 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Arnaldo Carvalho de Melo | 6b88dd9 | 2007-03-19 22:29:03 -0300 | [diff] [blame] | 503 | const int netoff = skb_network_offset(skb); |
| 504 | u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr); |
| 505 | int start = netoff + sizeof(struct ipv6hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 506 | int len = skb->len - start; |
| 507 | u8 prevhdr = NEXTHDR_IPV6; |
| 508 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 509 | while (nexthdr != NEXTHDR_FRAGMENT) { |
| 510 | struct ipv6_opt_hdr hdr; |
| 511 | int hdrlen; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 512 | |
| 513 | if (!ipv6_ext_hdr(nexthdr)) { |
| 514 | return -1; |
| 515 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 516 | if (nexthdr == NEXTHDR_NONE) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 517 | pr_debug("next header is none\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 518 | return -1; |
| 519 | } |
Christoph Paasch | d1238d5 | 2009-03-16 15:52:11 +0100 | [diff] [blame] | 520 | if (len < (int)sizeof(struct ipv6_opt_hdr)) { |
| 521 | pr_debug("too short\n"); |
| 522 | return -1; |
| 523 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 524 | if (skb_copy_bits(skb, start, &hdr, sizeof(hdr))) |
| 525 | BUG(); |
| 526 | if (nexthdr == NEXTHDR_AUTH) |
| 527 | hdrlen = (hdr.hdrlen+2)<<2; |
| 528 | else |
| 529 | hdrlen = ipv6_optlen(&hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 530 | |
| 531 | prevhdr = nexthdr; |
| 532 | prev_nhoff = start; |
| 533 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 534 | nexthdr = hdr.nexthdr; |
| 535 | len -= hdrlen; |
| 536 | start += hdrlen; |
| 537 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 538 | |
| 539 | if (len < 0) |
| 540 | return -1; |
| 541 | |
| 542 | *prevhdrp = prevhdr; |
| 543 | *prevhoff = prev_nhoff; |
| 544 | *fhoff = start; |
| 545 | |
| 546 | return 0; |
| 547 | } |
| 548 | |
Patrick McHardy | 0b5ccb2 | 2009-12-15 16:59:18 +0100 | [diff] [blame] | 549 | struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 550 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 551 | struct sk_buff *clone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 552 | struct net_device *dev = skb->dev; |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 553 | struct net *net = skb_dst(skb) ? dev_net(skb_dst(skb)->dev) |
| 554 | : dev_net(skb->dev); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 555 | struct frag_hdr *fhdr; |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 556 | struct frag_queue *fq; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 557 | struct ipv6hdr *hdr; |
| 558 | int fhoff, nhoff; |
| 559 | u8 prevhdr; |
| 560 | struct sk_buff *ret_skb = NULL; |
| 561 | |
| 562 | /* Jumbo payload inhibits frag. header */ |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 563 | if (ipv6_hdr(skb)->payload_len == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 564 | pr_debug("payload len = 0\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 565 | return skb; |
| 566 | } |
| 567 | |
| 568 | if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0) |
| 569 | return skb; |
| 570 | |
| 571 | clone = skb_clone(skb, GFP_ATOMIC); |
| 572 | if (clone == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 573 | pr_debug("Can't clone skb\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 574 | return skb; |
| 575 | } |
| 576 | |
| 577 | NFCT_FRAG6_CB(clone)->orig = skb; |
| 578 | |
| 579 | if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 580 | pr_debug("message is too short.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 581 | goto ret_orig; |
| 582 | } |
| 583 | |
Arnaldo Carvalho de Melo | 967b05f | 2007-03-13 13:51:52 -0300 | [diff] [blame] | 584 | skb_set_transport_header(clone, fhoff); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 585 | hdr = ipv6_hdr(clone); |
Arnaldo Carvalho de Melo | bff9b61 | 2007-03-16 17:19:57 -0300 | [diff] [blame] | 586 | fhdr = (struct frag_hdr *)skb_transport_header(clone); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 587 | |
Amerigo Wang | 6b10286 | 2012-09-18 16:50:11 +0000 | [diff] [blame] | 588 | local_bh_disable(); |
| 589 | inet_frag_evictor(&net->nf_frag.frags, &nf_frags, false); |
| 590 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 591 | |
Hannes Frederic Sowa | b8dd6a2 | 2013-03-24 15:20:51 +0000 | [diff] [blame] | 592 | fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr, |
| 593 | ip6_frag_ecn(hdr)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 594 | if (fq == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 595 | pr_debug("Can't find and can't create new queue\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 596 | goto ret_orig; |
| 597 | } |
| 598 | |
Jarek Poplawski | b9c6989 | 2008-06-04 09:58:27 -0700 | [diff] [blame] | 599 | spin_lock_bh(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 600 | |
| 601 | if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) { |
Jarek Poplawski | b9c6989 | 2008-06-04 09:58:27 -0700 | [diff] [blame] | 602 | spin_unlock_bh(&fq->q.lock); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 603 | pr_debug("Can't insert skb to queue\n"); |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 604 | inet_frag_put(&fq->q, &nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 605 | goto ret_orig; |
| 606 | } |
| 607 | |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 608 | if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
| 609 | fq->q.meat == fq->q.len) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 610 | ret_skb = nf_ct_frag6_reasm(fq, dev); |
| 611 | if (ret_skb == NULL) |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 612 | pr_debug("Can't reassemble fragmented packets\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 613 | } |
Jarek Poplawski | b9c6989 | 2008-06-04 09:58:27 -0700 | [diff] [blame] | 614 | spin_unlock_bh(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 615 | |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 616 | inet_frag_put(&fq->q, &nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 617 | return ret_skb; |
| 618 | |
| 619 | ret_orig: |
| 620 | kfree_skb(clone); |
| 621 | return skb; |
| 622 | } |
| 623 | |
| 624 | void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb, |
| 625 | struct net_device *in, struct net_device *out, |
| 626 | int (*okfn)(struct sk_buff *)) |
| 627 | { |
| 628 | struct sk_buff *s, *s2; |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 629 | unsigned int ret = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 630 | |
| 631 | for (s = NFCT_FRAG6_CB(skb)->orig; s;) { |
| 632 | nf_conntrack_put_reasm(s->nfct_reasm); |
| 633 | nf_conntrack_get_reasm(skb); |
| 634 | s->nfct_reasm = skb; |
| 635 | |
| 636 | s2 = s->next; |
Patrick McHardy | f9f02cc | 2007-01-09 14:32:41 -0800 | [diff] [blame] | 637 | s->next = NULL; |
| 638 | |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 639 | if (ret != -ECANCELED) |
| 640 | ret = NF_HOOK_THRESH(NFPROTO_IPV6, hooknum, s, |
| 641 | in, out, okfn, |
| 642 | NF_IP6_PRI_CONNTRACK_DEFRAG + 1); |
| 643 | else |
| 644 | kfree_skb(s); |
| 645 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 646 | s = s2; |
| 647 | } |
| 648 | nf_conntrack_put_reasm(skb); |
| 649 | } |
| 650 | |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 651 | static int nf_ct_net_init(struct net *net) |
| 652 | { |
| 653 | net->nf_frag.frags.high_thresh = IPV6_FRAG_HIGH_THRESH; |
| 654 | net->nf_frag.frags.low_thresh = IPV6_FRAG_LOW_THRESH; |
| 655 | net->nf_frag.frags.timeout = IPV6_FRAG_TIMEOUT; |
| 656 | inet_frags_init_net(&net->nf_frag.frags); |
| 657 | |
| 658 | return nf_ct_frag6_sysctl_register(net); |
| 659 | } |
| 660 | |
| 661 | static void nf_ct_net_exit(struct net *net) |
| 662 | { |
| 663 | nf_ct_frags6_sysctl_unregister(net); |
| 664 | inet_frags_exit_net(&net->nf_frag.frags, &nf_frags); |
| 665 | } |
| 666 | |
| 667 | static struct pernet_operations nf_ct_net_ops = { |
| 668 | .init = nf_ct_net_init, |
| 669 | .exit = nf_ct_net_exit, |
| 670 | }; |
| 671 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 672 | int nf_ct_frag6_init(void) |
| 673 | { |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 674 | int ret = 0; |
| 675 | |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 676 | nf_frags.hashfn = nf_hashfn; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 677 | nf_frags.constructor = ip6_frag_init; |
Pavel Emelyanov | c954770 | 2007-10-17 19:48:26 -0700 | [diff] [blame] | 678 | nf_frags.destructor = NULL; |
Pavel Emelyanov | 1e4b828 | 2007-10-15 02:39:14 -0700 | [diff] [blame] | 679 | nf_frags.skb_free = nf_skb_free; |
Amerigo Wang | b836c99 | 2012-09-18 16:50:09 +0000 | [diff] [blame] | 680 | nf_frags.qsize = sizeof(struct frag_queue); |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 681 | nf_frags.match = ip6_frag_match; |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 682 | nf_frags.frag_expire = nf_ct_frag6_expire; |
Pavel Emelyanov | 3b4bc4a | 2008-01-22 06:11:04 -0800 | [diff] [blame] | 683 | nf_frags.secret_interval = 10 * 60 * HZ; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 684 | inet_frags_init(&nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 685 | |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 686 | ret = register_pernet_subsys(&nf_ct_net_ops); |
| 687 | if (ret) |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 688 | inet_frags_fini(&nf_frags); |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 689 | |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 690 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | void nf_ct_frag6_cleanup(void) |
| 694 | { |
Amerigo Wang | c038a76 | 2012-09-18 16:50:08 +0000 | [diff] [blame] | 695 | unregister_pernet_subsys(&nf_ct_net_ops); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 696 | inet_frags_fini(&nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 697 | } |