Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173 |
| 3 | * |
| 4 | * Copyright (C)2003 USAGI/WIDE Project |
| 5 | * |
| 6 | * Author Mitsuru KANDA <mk@linux-ipv6.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 17 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 22 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * [Memo] |
| 24 | * |
| 25 | * Outbound: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 26 | * The compression of IP datagram MUST be done before AH/ESP processing, |
| 27 | * fragmentation, and the addition of Hop-by-Hop/Routing header. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * |
| 29 | * Inbound: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 30 | * The decompression of IP datagram MUST be done after the reassembly, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * AH/ESP processing. |
| 32 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/module.h> |
| 34 | #include <net/ip.h> |
| 35 | #include <net/xfrm.h> |
| 36 | #include <net/ipcomp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/semaphore.h> |
| 38 | #include <linux/crypto.h> |
Herbert Xu | 4999f36 | 2007-11-07 02:21:47 -0800 | [diff] [blame] | 39 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/pfkeyv2.h> |
| 41 | #include <linux/random.h> |
| 42 | #include <linux/percpu.h> |
| 43 | #include <linux/smp.h> |
| 44 | #include <linux/list.h> |
| 45 | #include <linux/vmalloc.h> |
| 46 | #include <linux/rtnetlink.h> |
| 47 | #include <net/icmp.h> |
| 48 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 49 | #include <net/protocol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/ipv6.h> |
| 51 | #include <linux/icmpv6.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 52 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | struct ipcomp6_tfms { |
| 55 | struct list_head list; |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 56 | struct crypto_comp **tfms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | int users; |
| 58 | }; |
| 59 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 60 | static DEFINE_MUTEX(ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static void **ipcomp6_scratches; |
| 62 | static int ipcomp6_scratch_users; |
| 63 | static LIST_HEAD(ipcomp6_tfms_list); |
| 64 | |
Herbert Xu | e695633 | 2006-04-01 00:52:46 -0800 | [diff] [blame] | 65 | static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Herbert Xu | 2614fa5 | 2008-01-29 21:11:46 -0800 | [diff] [blame] | 67 | int nexthdr; |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 68 | int err = -ENOMEM; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 69 | struct ip_comp_hdr *ipch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | int plen, dlen; |
| 71 | struct ipcomp_data *ipcd = x->data; |
| 72 | u8 *start, *scratch; |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 73 | struct crypto_comp *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | int cpu; |
| 75 | |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 76 | if (skb_linearize_cow(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | skb->ip_summed = CHECKSUM_NONE; |
| 80 | |
| 81 | /* Remove ipcomp header and decompress original payload */ |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 82 | ipch = (void *)skb->data; |
Herbert Xu | 2614fa5 | 2008-01-29 21:11:46 -0800 | [diff] [blame] | 83 | nexthdr = ipch->nexthdr; |
| 84 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 85 | skb->transport_header = skb->network_header + sizeof(*ipch); |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 86 | __skb_pull(skb, sizeof(*ipch)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | /* decompression */ |
| 89 | plen = skb->len; |
| 90 | dlen = IPCOMP_SCRATCH_SIZE; |
| 91 | start = skb->data; |
| 92 | |
| 93 | cpu = get_cpu(); |
| 94 | scratch = *per_cpu_ptr(ipcomp6_scratches, cpu); |
| 95 | tfm = *per_cpu_ptr(ipcd->tfms, cpu); |
| 96 | |
| 97 | err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 98 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | goto out_put_cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 101 | if (dlen < (plen + sizeof(*ipch))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | err = -EINVAL; |
| 103 | goto out_put_cpu; |
| 104 | } |
| 105 | |
| 106 | err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC); |
| 107 | if (err) { |
| 108 | goto out_put_cpu; |
| 109 | } |
| 110 | |
Herbert Xu | da95231 | 2006-07-11 13:50:09 -0700 | [diff] [blame] | 111 | skb->truesize += dlen - plen; |
| 112 | __skb_put(skb, dlen - plen); |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 113 | skb_copy_to_linear_data(skb, scratch, dlen); |
Herbert Xu | 2614fa5 | 2008-01-29 21:11:46 -0800 | [diff] [blame] | 114 | err = nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | out_put_cpu: |
| 117 | put_cpu(); |
| 118 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return err; |
| 120 | } |
| 121 | |
| 122 | static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb) |
| 123 | { |
| 124 | int err; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 125 | struct ip_comp_hdr *ipch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | struct ipcomp_data *ipcd = x->data; |
| 127 | int plen, dlen; |
| 128 | u8 *start, *scratch; |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 129 | struct crypto_comp *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | /* check whether datagram len is larger than threshold */ |
Herbert Xu | ceb1eec8 | 2007-10-10 15:45:52 -0700 | [diff] [blame] | 133 | if (skb->len < ipcd->threshold) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | goto out_ok; |
| 135 | } |
| 136 | |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 137 | if (skb_linearize_cow(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | goto out_ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | /* compression */ |
Herbert Xu | ceb1eec8 | 2007-10-10 15:45:52 -0700 | [diff] [blame] | 141 | plen = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | dlen = IPCOMP_SCRATCH_SIZE; |
Herbert Xu | ceb1eec8 | 2007-10-10 15:45:52 -0700 | [diff] [blame] | 143 | start = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | cpu = get_cpu(); |
| 146 | scratch = *per_cpu_ptr(ipcomp6_scratches, cpu); |
| 147 | tfm = *per_cpu_ptr(ipcd->tfms, cpu); |
| 148 | |
| 149 | err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 150 | if (err || (dlen + sizeof(*ipch)) >= plen) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | put_cpu(); |
| 152 | goto out_ok; |
| 153 | } |
| 154 | memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen); |
| 155 | put_cpu(); |
Herbert Xu | ceb1eec8 | 2007-10-10 15:45:52 -0700 | [diff] [blame] | 156 | pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | /* insert ipcomp header and replace datagram */ |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 159 | ipch = ip_comp_hdr(skb); |
Herbert Xu | 007f021 | 2007-10-09 13:25:59 -0700 | [diff] [blame] | 160 | ipch->nexthdr = *skb_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | ipch->flags = 0; |
| 162 | ipch->cpi = htons((u16 )ntohl(x->id.spi)); |
Herbert Xu | 007f021 | 2007-10-09 13:25:59 -0700 | [diff] [blame] | 163 | *skb_mac_header(skb) = IPPROTO_COMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
| 165 | out_ok: |
Herbert Xu | ceb1eec8 | 2007-10-10 15:45:52 -0700 | [diff] [blame] | 166 | skb_push(skb, -skb_network_offset(skb)); |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 172 | int type, int code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Al Viro | a94cfd1 | 2006-09-27 18:47:24 -0700 | [diff] [blame] | 174 | __be32 spi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 176 | struct ip_comp_hdr *ipcomph = |
| 177 | (struct ip_comp_hdr *)(skb->data + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | struct xfrm_state *x; |
| 179 | |
| 180 | if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG) |
| 181 | return; |
| 182 | |
Alexey Dobriyan | 4195f81 | 2006-05-22 16:53:22 -0700 | [diff] [blame] | 183 | spi = htonl(ntohs(ipcomph->cpi)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6); |
| 185 | if (!x) |
| 186 | return; |
| 187 | |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 188 | printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | spi, NIP6(iph->daddr)); |
| 190 | xfrm_state_put(x); |
| 191 | } |
| 192 | |
| 193 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) |
| 194 | { |
| 195 | struct xfrm_state *t = NULL; |
| 196 | |
| 197 | t = xfrm_state_alloc(); |
| 198 | if (!t) |
| 199 | goto out; |
| 200 | |
| 201 | t->id.proto = IPPROTO_IPV6; |
| 202 | t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr); |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 203 | if (!t->id.spi) |
| 204 | goto error; |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
| 207 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); |
| 208 | t->props.family = AF_INET6; |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 209 | t->props.mode = x->props.mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
| 211 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 212 | if (xfrm_init_state(t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | goto error; |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | atomic_set(&t->tunnel_users, 1); |
| 216 | |
| 217 | out: |
| 218 | return t; |
| 219 | |
| 220 | error: |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 221 | t->km.state = XFRM_STATE_DEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | xfrm_state_put(t); |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 223 | t = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | goto out; |
| 225 | } |
| 226 | |
| 227 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) |
| 228 | { |
| 229 | int err = 0; |
| 230 | struct xfrm_state *t = NULL; |
Al Viro | a94cfd1 | 2006-09-27 18:47:24 -0700 | [diff] [blame] | 231 | __be32 spi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr); |
| 234 | if (spi) |
| 235 | t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr, |
| 236 | spi, IPPROTO_IPV6, AF_INET6); |
| 237 | if (!t) { |
| 238 | t = ipcomp6_tunnel_create(x); |
| 239 | if (!t) { |
| 240 | err = -EINVAL; |
| 241 | goto out; |
| 242 | } |
| 243 | xfrm_state_insert(t); |
| 244 | xfrm_state_hold(t); |
| 245 | } |
| 246 | x->tunnel = t; |
| 247 | atomic_inc(&t->tunnel_users); |
| 248 | |
| 249 | out: |
| 250 | return err; |
| 251 | } |
| 252 | |
| 253 | static void ipcomp6_free_scratches(void) |
| 254 | { |
| 255 | int i; |
| 256 | void **scratches; |
| 257 | |
| 258 | if (--ipcomp6_scratch_users) |
| 259 | return; |
| 260 | |
| 261 | scratches = ipcomp6_scratches; |
| 262 | if (!scratches) |
| 263 | return; |
| 264 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 265 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | void *scratch = *per_cpu_ptr(scratches, i); |
Jesper Juhl | 2b191be | 2006-03-20 17:46:29 -0800 | [diff] [blame] | 267 | |
| 268 | vfree(scratch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | free_percpu(scratches); |
| 272 | } |
| 273 | |
| 274 | static void **ipcomp6_alloc_scratches(void) |
| 275 | { |
| 276 | int i; |
| 277 | void **scratches; |
| 278 | |
| 279 | if (ipcomp6_scratch_users++) |
| 280 | return ipcomp6_scratches; |
| 281 | |
| 282 | scratches = alloc_percpu(void *); |
| 283 | if (!scratches) |
| 284 | return NULL; |
| 285 | |
| 286 | ipcomp6_scratches = scratches; |
| 287 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 288 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE); |
| 290 | if (!scratch) |
| 291 | return NULL; |
| 292 | *per_cpu_ptr(scratches, i) = scratch; |
| 293 | } |
| 294 | |
| 295 | return scratches; |
| 296 | } |
| 297 | |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 298 | static void ipcomp6_free_tfms(struct crypto_comp **tfms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
| 300 | struct ipcomp6_tfms *pos; |
| 301 | int cpu; |
| 302 | |
| 303 | list_for_each_entry(pos, &ipcomp6_tfms_list, list) { |
| 304 | if (pos->tfms == tfms) |
| 305 | break; |
| 306 | } |
| 307 | |
| 308 | BUG_TRAP(pos); |
| 309 | |
| 310 | if (--pos->users) |
| 311 | return; |
| 312 | |
| 313 | list_del(&pos->list); |
| 314 | kfree(pos); |
| 315 | |
| 316 | if (!tfms) |
| 317 | return; |
| 318 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 319 | for_each_possible_cpu(cpu) { |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 320 | struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu); |
| 321 | crypto_free_comp(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | free_percpu(tfms); |
| 324 | } |
| 325 | |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 326 | static struct crypto_comp **ipcomp6_alloc_tfms(const char *alg_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | struct ipcomp6_tfms *pos; |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 329 | struct crypto_comp **tfms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | int cpu; |
| 331 | |
| 332 | /* This can be any valid CPU ID so we don't need locking. */ |
Herbert Xu | 6fc8b9e | 2005-08-18 14:36:59 -0700 | [diff] [blame] | 333 | cpu = raw_smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | list_for_each_entry(pos, &ipcomp6_tfms_list, list) { |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 336 | struct crypto_comp *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | tfms = pos->tfms; |
| 339 | tfm = *per_cpu_ptr(tfms, cpu); |
| 340 | |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 341 | if (!strcmp(crypto_comp_name(tfm), alg_name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | pos->users++; |
| 343 | return tfms; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | pos = kmalloc(sizeof(*pos), GFP_KERNEL); |
| 348 | if (!pos) |
| 349 | return NULL; |
| 350 | |
| 351 | pos->users = 1; |
| 352 | INIT_LIST_HEAD(&pos->list); |
| 353 | list_add(&pos->list, &ipcomp6_tfms_list); |
| 354 | |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 355 | pos->tfms = tfms = alloc_percpu(struct crypto_comp *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (!tfms) |
| 357 | goto error; |
| 358 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 359 | for_each_possible_cpu(cpu) { |
Herbert Xu | e4d5b79 | 2006-08-26 18:12:40 +1000 | [diff] [blame] | 360 | struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0, |
| 361 | CRYPTO_ALG_ASYNC); |
Herbert Xu | 4999f36 | 2007-11-07 02:21:47 -0800 | [diff] [blame] | 362 | if (IS_ERR(tfm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | goto error; |
| 364 | *per_cpu_ptr(tfms, cpu) = tfm; |
| 365 | } |
| 366 | |
| 367 | return tfms; |
| 368 | |
| 369 | error: |
| 370 | ipcomp6_free_tfms(tfms); |
| 371 | return NULL; |
| 372 | } |
| 373 | |
| 374 | static void ipcomp6_free_data(struct ipcomp_data *ipcd) |
| 375 | { |
| 376 | if (ipcd->tfms) |
| 377 | ipcomp6_free_tfms(ipcd->tfms); |
| 378 | ipcomp6_free_scratches(); |
| 379 | } |
| 380 | |
| 381 | static void ipcomp6_destroy(struct xfrm_state *x) |
| 382 | { |
| 383 | struct ipcomp_data *ipcd = x->data; |
| 384 | if (!ipcd) |
| 385 | return; |
| 386 | xfrm_state_delete_tunnel(x); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 387 | mutex_lock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | ipcomp6_free_data(ipcd); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 389 | mutex_unlock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | kfree(ipcd); |
| 391 | |
| 392 | xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr); |
| 393 | } |
| 394 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 395 | static int ipcomp6_init_state(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | { |
| 397 | int err; |
| 398 | struct ipcomp_data *ipcd; |
| 399 | struct xfrm_algo_desc *calg_desc; |
| 400 | |
| 401 | err = -EINVAL; |
| 402 | if (!x->calg) |
| 403 | goto out; |
| 404 | |
| 405 | if (x->encap) |
| 406 | goto out; |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | x->props.header_len = 0; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 409 | switch (x->props.mode) { |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 410 | case XFRM_MODE_TRANSPORT: |
| 411 | break; |
| 412 | case XFRM_MODE_TUNNEL: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | x->props.header_len += sizeof(struct ipv6hdr); |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 414 | break; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 415 | default: |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 416 | goto out; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 417 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 418 | |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 419 | err = -ENOMEM; |
| 420 | ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL); |
| 421 | if (!ipcd) |
| 422 | goto out; |
| 423 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 424 | mutex_lock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | if (!ipcomp6_alloc_scratches()) |
| 426 | goto error; |
| 427 | |
| 428 | ipcd->tfms = ipcomp6_alloc_tfms(x->calg->alg_name); |
| 429 | if (!ipcd->tfms) |
| 430 | goto error; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 431 | mutex_unlock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 433 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | err = ipcomp6_tunnel_attach(x); |
| 435 | if (err) |
| 436 | goto error_tunnel; |
| 437 | } |
| 438 | |
| 439 | calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0); |
| 440 | BUG_ON(!calg_desc); |
| 441 | ipcd->threshold = calg_desc->uinfo.comp.threshold; |
| 442 | x->data = ipcd; |
| 443 | err = 0; |
| 444 | out: |
| 445 | return err; |
| 446 | error_tunnel: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 447 | mutex_lock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | error: |
| 449 | ipcomp6_free_data(ipcd); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 450 | mutex_unlock(&ipcomp6_resource_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | kfree(ipcd); |
| 452 | |
| 453 | goto out; |
| 454 | } |
| 455 | |
Eric Dumazet | 533cb5b | 2008-01-30 19:11:50 -0800 | [diff] [blame] | 456 | static const struct xfrm_type ipcomp6_type = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
| 458 | .description = "IPCOMP6", |
| 459 | .owner = THIS_MODULE, |
| 460 | .proto = IPPROTO_COMP, |
| 461 | .init_state = ipcomp6_init_state, |
| 462 | .destructor = ipcomp6_destroy, |
| 463 | .input = ipcomp6_input, |
| 464 | .output = ipcomp6_output, |
Masahide NAKAMURA | aee5adb | 2006-08-23 17:57:28 -0700 | [diff] [blame] | 465 | .hdr_offset = xfrm6_find_1stfragopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | }; |
| 467 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 468 | static struct inet6_protocol ipcomp6_protocol = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
| 470 | .handler = xfrm6_rcv, |
| 471 | .err_handler = ipcomp6_err, |
| 472 | .flags = INET6_PROTO_NOPOLICY, |
| 473 | }; |
| 474 | |
| 475 | static int __init ipcomp6_init(void) |
| 476 | { |
| 477 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { |
| 478 | printk(KERN_INFO "ipcomp6 init: can't add xfrm type\n"); |
| 479 | return -EAGAIN; |
| 480 | } |
| 481 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { |
| 482 | printk(KERN_INFO "ipcomp6 init: can't add protocol\n"); |
| 483 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
| 484 | return -EAGAIN; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static void __exit ipcomp6_fini(void) |
| 490 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 491 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | printk(KERN_INFO "ipv6 ipcomp close: can't remove protocol\n"); |
| 493 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) |
| 494 | printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n"); |
| 495 | } |
| 496 | |
| 497 | module_init(ipcomp6_init); |
| 498 | module_exit(ipcomp6_fini); |
| 499 | MODULE_LICENSE("GPL"); |
| 500 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); |
| 501 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); |
| 502 | |
Masahide NAKAMURA | d3d6dd3 | 2007-06-26 23:57:49 -0700 | [diff] [blame] | 503 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |