Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C)2002 USAGI/WIDE Project |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * Authors |
| 19 | * |
| 20 | * Mitsuru KANDA @USAGI : IPv6 Support |
| 21 | * Kazunori MIYAZAWA @USAGI : |
| 22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| 23 | * |
| 24 | * This file is derived from net/ipv4/esp.c |
| 25 | */ |
| 26 | |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 27 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/module.h> |
| 29 | #include <net/ip.h> |
| 30 | #include <net/xfrm.h> |
| 31 | #include <net/esp.h> |
| 32 | #include <asm/scatterlist.h> |
| 33 | #include <linux/crypto.h> |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 34 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/pfkeyv2.h> |
| 36 | #include <linux/random.h> |
| 37 | #include <net/icmp.h> |
| 38 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 39 | #include <net/protocol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/icmpv6.h> |
| 41 | |
| 42 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
| 43 | { |
| 44 | int err; |
| 45 | int hdr_len; |
| 46 | struct ipv6hdr *top_iph; |
| 47 | struct ipv6_esp_hdr *esph; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 48 | struct crypto_blkcipher *tfm; |
| 49 | struct blkcipher_desc desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | struct esp_data *esp; |
| 51 | struct sk_buff *trailer; |
| 52 | int blksize; |
| 53 | int clen; |
| 54 | int alen; |
| 55 | int nfrags; |
| 56 | |
| 57 | esp = x->data; |
| 58 | hdr_len = skb->h.raw - skb->data + |
| 59 | sizeof(*esph) + esp->conf.ivlen; |
| 60 | |
| 61 | /* Strip IP+ESP header. */ |
| 62 | __skb_pull(skb, hdr_len); |
| 63 | |
| 64 | /* Now skb is pure payload to encrypt */ |
| 65 | err = -ENOMEM; |
| 66 | |
| 67 | /* Round to block size */ |
| 68 | clen = skb->len; |
| 69 | |
| 70 | alen = esp->auth.icv_trunc_len; |
| 71 | tfm = esp->conf.tfm; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 72 | desc.tfm = tfm; |
| 73 | desc.flags = 0; |
| 74 | blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 75 | clen = ALIGN(clen + 2, blksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | if (esp->conf.padlen) |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 77 | clen = ALIGN(clen, esp->conf.padlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) { |
| 80 | goto error; |
| 81 | } |
| 82 | |
| 83 | /* Fill padding... */ |
| 84 | do { |
| 85 | int i; |
| 86 | for (i=0; i<clen-skb->len - 2; i++) |
| 87 | *(u8*)(trailer->tail + i) = i+1; |
| 88 | } while (0); |
| 89 | *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2; |
| 90 | pskb_put(skb, trailer, clen - skb->len); |
| 91 | |
| 92 | top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len); |
| 93 | esph = (struct ipv6_esp_hdr *)skb->h.raw; |
| 94 | top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph)); |
| 95 | *(u8*)(trailer->tail - 1) = *skb->nh.raw; |
| 96 | *skb->nh.raw = IPPROTO_ESP; |
| 97 | |
| 98 | esph->spi = x->id.spi; |
| 99 | esph->seq_no = htonl(++x->replay.oseq); |
Jamal Hadi Salim | 9500e8a | 2006-03-20 19:15:29 -0800 | [diff] [blame] | 100 | xfrm_aevent_doreplay(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
David S. Miller | e4bec82 | 2006-09-22 15:17:35 -0700 | [diff] [blame] | 102 | if (esp->conf.ivlen) { |
| 103 | if (unlikely(!esp->conf.ivinitted)) { |
| 104 | get_random_bytes(esp->conf.ivec, esp->conf.ivlen); |
| 105 | esp->conf.ivinitted = 1; |
| 106 | } |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 107 | crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen); |
David S. Miller | e4bec82 | 2006-09-22 15:17:35 -0700 | [diff] [blame] | 108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | do { |
| 111 | struct scatterlist *sg = &esp->sgbuf[0]; |
| 112 | |
| 113 | if (unlikely(nfrags > ESP_NUM_FAST_SG)) { |
| 114 | sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); |
| 115 | if (!sg) |
| 116 | goto error; |
| 117 | } |
| 118 | skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen); |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 119 | err = crypto_blkcipher_encrypt(&desc, sg, sg, clen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | if (unlikely(sg != &esp->sgbuf[0])) |
| 121 | kfree(sg); |
| 122 | } while (0); |
| 123 | |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 124 | if (unlikely(err)) |
| 125 | goto error; |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | if (esp->conf.ivlen) { |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 128 | memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen); |
| 129 | crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | if (esp->auth.icv_full_len) { |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 133 | err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data, |
| 134 | sizeof(*esph) + esp->conf.ivlen + clen); |
| 135 | memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | error: |
| 139 | return err; |
| 140 | } |
| 141 | |
Herbert Xu | e695633 | 2006-04-01 00:52:46 -0800 | [diff] [blame] | 142 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
| 144 | struct ipv6hdr *iph; |
| 145 | struct ipv6_esp_hdr *esph; |
| 146 | struct esp_data *esp = x->data; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 147 | struct crypto_blkcipher *tfm = esp->conf.tfm; |
| 148 | struct blkcipher_desc desc = { .tfm = tfm }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | struct sk_buff *trailer; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 150 | int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | int alen = esp->auth.icv_trunc_len; |
| 152 | int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen; |
| 153 | |
| 154 | int hdr_len = skb->h.raw - skb->nh.raw; |
| 155 | int nfrags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | int ret = 0; |
| 157 | |
| 158 | if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) { |
| 159 | ret = -EINVAL; |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 160 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | if (elen <= 0 || (elen & (blksize-1))) { |
| 164 | ret = -EINVAL; |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 165 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | /* If integrity check is required, do this. */ |
| 169 | if (esp->auth.icv_full_len) { |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 170 | u8 sum[alen]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 172 | ret = esp_mac_digest(esp, skb, 0, skb->len - alen); |
| 173 | if (ret) |
| 174 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 176 | if (skb_copy_bits(skb, skb->len - alen, sum, alen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | BUG(); |
| 178 | |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 179 | if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | x->stats.integrity_failed++; |
| 181 | ret = -EINVAL; |
| 182 | goto out; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { |
| 187 | ret = -EINVAL; |
| 188 | goto out; |
| 189 | } |
| 190 | |
| 191 | skb->ip_summed = CHECKSUM_NONE; |
| 192 | |
| 193 | esph = (struct ipv6_esp_hdr*)skb->data; |
| 194 | iph = skb->nh.ipv6h; |
| 195 | |
| 196 | /* Get ivec. This can be wrong, check against another impls. */ |
| 197 | if (esp->conf.ivlen) |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 198 | crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | { |
| 201 | u8 nexthdr[2]; |
| 202 | struct scatterlist *sg = &esp->sgbuf[0]; |
| 203 | u8 padlen; |
| 204 | |
| 205 | if (unlikely(nfrags > ESP_NUM_FAST_SG)) { |
| 206 | sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); |
| 207 | if (!sg) { |
| 208 | ret = -ENOMEM; |
| 209 | goto out; |
| 210 | } |
| 211 | } |
| 212 | skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen); |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 213 | ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | if (unlikely(sg != &esp->sgbuf[0])) |
| 215 | kfree(sg); |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 216 | if (unlikely(ret)) |
| 217 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
| 219 | if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) |
| 220 | BUG(); |
| 221 | |
| 222 | padlen = nexthdr[0]; |
| 223 | if (padlen+2 >= elen) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 224 | LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | ret = -EINVAL; |
| 226 | goto out; |
| 227 | } |
| 228 | /* ... check padding bits here. Silly. :-) */ |
| 229 | |
| 230 | pskb_trim(skb, skb->len - alen - padlen - 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | ret = nexthdr[1]; |
| 232 | } |
| 233 | |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 234 | skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - hdr_len; |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | static u32 esp6_get_max_size(struct xfrm_state *x, int mtu) |
| 241 | { |
| 242 | struct esp_data *esp = x->data; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 243 | u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 245 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 246 | mtu = ALIGN(mtu + 2, blksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } else { |
| 248 | /* The worst case. */ |
Herbert Xu | d4875b0 | 2005-10-10 21:11:34 -0700 | [diff] [blame] | 249 | u32 padsize = ((blksize - 1) & 7) + 1; |
| 250 | mtu = ALIGN(mtu + 2, padsize) + blksize - padsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | if (esp->conf.padlen) |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 253 | mtu = ALIGN(mtu, esp->conf.padlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Kazunori MIYAZAWA | 73d4f84 | 2005-12-08 23:11:42 -0800 | [diff] [blame] | 255 | return mtu + x->props.header_len + esp->auth.icv_trunc_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 259 | int type, int code, int offset, __u32 info) |
| 260 | { |
| 261 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
| 262 | struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset); |
| 263 | struct xfrm_state *x; |
| 264 | |
| 265 | if (type != ICMPV6_DEST_UNREACH && |
| 266 | type != ICMPV6_PKT_TOOBIG) |
| 267 | return; |
| 268 | |
| 269 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); |
| 270 | if (!x) |
| 271 | return; |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 272 | printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | ntohl(esph->spi), NIP6(iph->daddr)); |
| 274 | xfrm_state_put(x); |
| 275 | } |
| 276 | |
| 277 | static void esp6_destroy(struct xfrm_state *x) |
| 278 | { |
| 279 | struct esp_data *esp = x->data; |
| 280 | |
| 281 | if (!esp) |
| 282 | return; |
| 283 | |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 284 | crypto_free_blkcipher(esp->conf.tfm); |
Jesper Juhl | 573dbd9 | 2005-09-01 17:44:29 -0700 | [diff] [blame] | 285 | esp->conf.tfm = NULL; |
| 286 | kfree(esp->conf.ivec); |
| 287 | esp->conf.ivec = NULL; |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 288 | crypto_free_hash(esp->auth.tfm); |
Jesper Juhl | 573dbd9 | 2005-09-01 17:44:29 -0700 | [diff] [blame] | 289 | esp->auth.tfm = NULL; |
| 290 | kfree(esp->auth.work_icv); |
| 291 | esp->auth.work_icv = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | kfree(esp); |
| 293 | } |
| 294 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 295 | static int esp6_init_state(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
| 297 | struct esp_data *esp = NULL; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 298 | struct crypto_blkcipher *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | /* null auth and encryption can have zero length keys */ |
| 301 | if (x->aalg) { |
| 302 | if (x->aalg->alg_key_len > 512) |
| 303 | goto error; |
| 304 | } |
| 305 | if (x->ealg == NULL) |
| 306 | goto error; |
| 307 | |
| 308 | if (x->encap) |
| 309 | goto error; |
| 310 | |
Ingo Oeser | 0c600ed | 2006-03-20 23:01:32 -0800 | [diff] [blame] | 311 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | if (esp == NULL) |
| 313 | return -ENOMEM; |
| 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | if (x->aalg) { |
| 316 | struct xfrm_algo_desc *aalg_desc; |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 317 | struct crypto_hash *hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | esp->auth.key = x->aalg->alg_key; |
| 320 | esp->auth.key_len = (x->aalg->alg_key_len+7)/8; |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 321 | hash = crypto_alloc_hash(x->aalg->alg_name, 0, |
| 322 | CRYPTO_ALG_ASYNC); |
| 323 | if (IS_ERR(hash)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | goto error; |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 325 | |
| 326 | esp->auth.tfm = hash; |
| 327 | if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len)) |
| 328 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
| 331 | BUG_ON(!aalg_desc); |
| 332 | |
| 333 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 334 | crypto_hash_digestsize(hash)) { |
| 335 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
| 336 | x->aalg->alg_name, |
| 337 | crypto_hash_digestsize(hash), |
| 338 | aalg_desc->uinfo.auth.icv_fullbits/8); |
| 339 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
| 343 | esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; |
| 344 | |
| 345 | esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL); |
| 346 | if (!esp->auth.work_icv) |
| 347 | goto error; |
| 348 | } |
| 349 | esp->conf.key = x->ealg->alg_key; |
| 350 | esp->conf.key_len = (x->ealg->alg_key_len+7)/8; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 351 | tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC); |
| 352 | if (IS_ERR(tfm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | goto error; |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 354 | esp->conf.tfm = tfm; |
| 355 | esp->conf.ivlen = crypto_blkcipher_ivsize(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | esp->conf.padlen = 0; |
| 357 | if (esp->conf.ivlen) { |
| 358 | esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL); |
| 359 | if (unlikely(esp->conf.ivec == NULL)) |
| 360 | goto error; |
David S. Miller | e4bec82 | 2006-09-22 15:17:35 -0700 | [diff] [blame] | 361 | esp->conf.ivinitted = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 363 | if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | goto error; |
| 365 | x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen; |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 366 | if (x->props.mode == XFRM_MODE_TUNNEL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | x->props.header_len += sizeof(struct ipv6hdr); |
| 368 | x->data = esp; |
| 369 | return 0; |
| 370 | |
| 371 | error: |
| 372 | x->data = esp; |
| 373 | esp6_destroy(x); |
| 374 | x->data = NULL; |
| 375 | return -EINVAL; |
| 376 | } |
| 377 | |
| 378 | static struct xfrm_type esp6_type = |
| 379 | { |
| 380 | .description = "ESP6", |
| 381 | .owner = THIS_MODULE, |
| 382 | .proto = IPPROTO_ESP, |
| 383 | .init_state = esp6_init_state, |
| 384 | .destructor = esp6_destroy, |
| 385 | .get_max_size = esp6_get_max_size, |
| 386 | .input = esp6_input, |
Masahide NAKAMURA | aee5adb | 2006-08-23 17:57:28 -0700 | [diff] [blame] | 387 | .output = esp6_output, |
| 388 | .hdr_offset = xfrm6_find_1stfragopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | }; |
| 390 | |
| 391 | static struct inet6_protocol esp6_protocol = { |
| 392 | .handler = xfrm6_rcv, |
| 393 | .err_handler = esp6_err, |
| 394 | .flags = INET6_PROTO_NOPOLICY, |
| 395 | }; |
| 396 | |
| 397 | static int __init esp6_init(void) |
| 398 | { |
| 399 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { |
| 400 | printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); |
| 401 | return -EAGAIN; |
| 402 | } |
| 403 | if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { |
| 404 | printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); |
| 405 | xfrm_unregister_type(&esp6_type, AF_INET6); |
| 406 | return -EAGAIN; |
| 407 | } |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | static void __exit esp6_fini(void) |
| 413 | { |
| 414 | if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) |
| 415 | printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); |
| 416 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
| 417 | printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); |
| 418 | } |
| 419 | |
| 420 | module_init(esp6_init); |
| 421 | module_exit(esp6_fini); |
| 422 | |
| 423 | MODULE_LICENSE("GPL"); |