Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C)2002 USAGI/WIDE Project |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 13 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 20 | * Mitsuru KANDA @USAGI : IPv6 Support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * Kazunori MIYAZAWA @USAGI : |
| 22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 23 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * This file is derived from net/ipv4/esp.c |
| 25 | */ |
| 26 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 27 | #include <crypto/aead.h> |
| 28 | #include <crypto/authenc.h> |
Herbert Xu | 6b7326c | 2006-07-30 15:41:01 +1000 | [diff] [blame] | 29 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/module.h> |
| 31 | #include <net/ip.h> |
| 32 | #include <net/xfrm.h> |
| 33 | #include <net/esp.h> |
Adrian Bunk | 72998d8 | 2007-10-26 22:53:58 -0700 | [diff] [blame] | 34 | #include <linux/scatterlist.h> |
Herbert Xu | a02a642 | 2005-10-10 21:11:08 -0700 | [diff] [blame] | 35 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/pfkeyv2.h> |
| 37 | #include <linux/random.h> |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 38 | #include <linux/slab.h> |
Herbert Xu | b7c6538 | 2007-10-09 13:33:35 -0700 | [diff] [blame] | 39 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <net/icmp.h> |
| 41 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 42 | #include <net/protocol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/icmpv6.h> |
| 44 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 45 | struct esp_skb_cb { |
| 46 | struct xfrm_skb_cb xfrm; |
| 47 | void *tmp; |
| 48 | }; |
| 49 | |
| 50 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) |
| 51 | |
| 52 | /* |
| 53 | * Allocate an AEAD request structure with extra space for SG and IV. |
| 54 | * |
| 55 | * For alignment considerations the IV is placed at the front, followed |
| 56 | * by the request and finally the SG list. |
| 57 | * |
| 58 | * TODO: Use spare space in skb for this where possible. |
| 59 | */ |
| 60 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags) |
| 61 | { |
| 62 | unsigned int len; |
| 63 | |
| 64 | len = crypto_aead_ivsize(aead); |
| 65 | if (len) { |
| 66 | len += crypto_aead_alignmask(aead) & |
| 67 | ~(crypto_tfm_ctx_alignment() - 1); |
| 68 | len = ALIGN(len, crypto_tfm_ctx_alignment()); |
| 69 | } |
| 70 | |
| 71 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); |
| 72 | len = ALIGN(len, __alignof__(struct scatterlist)); |
| 73 | |
| 74 | len += sizeof(struct scatterlist) * nfrags; |
| 75 | |
| 76 | return kmalloc(len, GFP_ATOMIC); |
| 77 | } |
| 78 | |
| 79 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp) |
| 80 | { |
| 81 | return crypto_aead_ivsize(aead) ? |
| 82 | PTR_ALIGN((u8 *)tmp, crypto_aead_alignmask(aead) + 1) : tmp; |
| 83 | } |
| 84 | |
| 85 | static inline struct aead_givcrypt_request *esp_tmp_givreq( |
| 86 | struct crypto_aead *aead, u8 *iv) |
| 87 | { |
| 88 | struct aead_givcrypt_request *req; |
| 89 | |
| 90 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), |
| 91 | crypto_tfm_ctx_alignment()); |
| 92 | aead_givcrypt_set_tfm(req, aead); |
| 93 | return req; |
| 94 | } |
| 95 | |
| 96 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
| 97 | { |
| 98 | struct aead_request *req; |
| 99 | |
| 100 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), |
| 101 | crypto_tfm_ctx_alignment()); |
| 102 | aead_request_set_tfm(req, aead); |
| 103 | return req; |
| 104 | } |
| 105 | |
| 106 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, |
| 107 | struct aead_request *req) |
| 108 | { |
| 109 | return (void *)ALIGN((unsigned long)(req + 1) + |
| 110 | crypto_aead_reqsize(aead), |
| 111 | __alignof__(struct scatterlist)); |
| 112 | } |
| 113 | |
| 114 | static inline struct scatterlist *esp_givreq_sg( |
| 115 | struct crypto_aead *aead, struct aead_givcrypt_request *req) |
| 116 | { |
| 117 | return (void *)ALIGN((unsigned long)(req + 1) + |
| 118 | crypto_aead_reqsize(aead), |
| 119 | __alignof__(struct scatterlist)); |
| 120 | } |
| 121 | |
| 122 | static void esp_output_done(struct crypto_async_request *base, int err) |
| 123 | { |
| 124 | struct sk_buff *skb = base->data; |
| 125 | |
| 126 | kfree(ESP_SKB_CB(skb)->tmp); |
| 127 | xfrm_output_resume(skb, err); |
| 128 | } |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
| 131 | { |
| 132 | int err; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 133 | struct ip_esp_hdr *esph; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 134 | struct crypto_aead *aead; |
| 135 | struct aead_givcrypt_request *req; |
| 136 | struct scatterlist *sg; |
| 137 | struct scatterlist *asg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | struct sk_buff *trailer; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 139 | void *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | int blksize; |
| 141 | int clen; |
| 142 | int alen; |
| 143 | int nfrags; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 144 | u8 *iv; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 145 | u8 *tail; |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 146 | struct esp_data *esp = x->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Herbert Xu | 7b277b1 | 2007-10-10 15:44:06 -0700 | [diff] [blame] | 148 | /* skb is pure payload to encrypt */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | err = -ENOMEM; |
| 150 | |
| 151 | /* Round to block size */ |
| 152 | clen = skb->len; |
| 153 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 154 | aead = esp->aead; |
| 155 | alen = crypto_aead_authsize(aead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 157 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
| 158 | clen = ALIGN(clen + 2, blksize); |
| 159 | if (esp->padlen) |
| 160 | clen = ALIGN(clen, esp->padlen); |
| 161 | |
| 162 | if ((err = skb_cow_data(skb, clen - skb->len + alen, &trailer)) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | goto error; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 164 | nfrags = err; |
| 165 | |
| 166 | tmp = esp_alloc_tmp(aead, nfrags + 1); |
| 167 | if (!tmp) |
| 168 | goto error; |
| 169 | |
| 170 | iv = esp_tmp_iv(aead, tmp); |
| 171 | req = esp_tmp_givreq(aead, iv); |
| 172 | asg = esp_givreq_sg(aead, req); |
| 173 | sg = asg + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | /* Fill padding... */ |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 176 | tail = skb_tail_pointer(trailer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | do { |
| 178 | int i; |
| 179 | for (i=0; i<clen-skb->len - 2; i++) |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 180 | tail[i] = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } while (0); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 182 | tail[clen-skb->len - 2] = (clen - skb->len) - 2; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 183 | tail[clen - skb->len - 1] = *skb_mac_header(skb); |
| 184 | pskb_put(skb, trailer, clen - skb->len + alen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Herbert Xu | 7b277b1 | 2007-10-10 15:44:06 -0700 | [diff] [blame] | 186 | skb_push(skb, -skb_network_offset(skb)); |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 187 | esph = ip_esp_hdr(skb); |
Herbert Xu | 007f021 | 2007-10-09 13:25:59 -0700 | [diff] [blame] | 188 | *skb_mac_header(skb) = IPPROTO_ESP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | esph->spi = x->id.spi; |
Herbert Xu | b318e0e | 2008-02-12 22:50:35 -0800 | [diff] [blame^] | 191 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 193 | sg_init_table(sg, nfrags); |
| 194 | skb_to_sgvec(skb, sg, |
| 195 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, |
| 196 | clen + alen); |
| 197 | sg_init_one(asg, esph, sizeof(*esph)); |
Herbert Xu | b7c6538 | 2007-10-09 13:33:35 -0700 | [diff] [blame] | 198 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 199 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); |
| 200 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); |
| 201 | aead_givcrypt_set_assoc(req, asg, sizeof(*esph)); |
Herbert Xu | b318e0e | 2008-02-12 22:50:35 -0800 | [diff] [blame^] | 202 | aead_givcrypt_set_giv(req, esph->enc_data, |
| 203 | XFRM_SKB_CB(skb)->seq.output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 205 | ESP_SKB_CB(skb)->tmp = tmp; |
| 206 | err = crypto_aead_givencrypt(req); |
| 207 | if (err == -EINPROGRESS) |
| 208 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 210 | if (err == -EBUSY) |
| 211 | err = NET_XMIT_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 213 | kfree(tmp); |
Herbert Xu | b7c6538 | 2007-10-09 13:33:35 -0700 | [diff] [blame] | 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | error: |
| 216 | return err; |
| 217 | } |
| 218 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 219 | static int esp_input_done2(struct sk_buff *skb, int err) |
| 220 | { |
| 221 | struct xfrm_state *x = xfrm_input_state(skb); |
| 222 | struct esp_data *esp = x->data; |
| 223 | struct crypto_aead *aead = esp->aead; |
| 224 | int alen = crypto_aead_authsize(aead); |
| 225 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
| 226 | int elen = skb->len - hlen; |
| 227 | int hdr_len = skb_network_header_len(skb); |
| 228 | int padlen; |
| 229 | u8 nexthdr[2]; |
| 230 | |
| 231 | kfree(ESP_SKB_CB(skb)->tmp); |
| 232 | |
| 233 | if (unlikely(err)) |
| 234 | goto out; |
| 235 | |
| 236 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
| 237 | BUG(); |
| 238 | |
| 239 | err = -EINVAL; |
| 240 | padlen = nexthdr[0]; |
| 241 | if (padlen + 2 + alen >= elen) { |
| 242 | LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage " |
| 243 | "padlen=%d, elen=%d\n", padlen + 2, elen - alen); |
| 244 | goto out; |
| 245 | } |
| 246 | |
| 247 | /* ... check padding bits here. Silly. :-) */ |
| 248 | |
| 249 | pskb_trim(skb, skb->len - alen - padlen - 2); |
| 250 | __skb_pull(skb, hlen); |
| 251 | skb_set_transport_header(skb, -hdr_len); |
| 252 | |
| 253 | err = nexthdr[1]; |
| 254 | |
| 255 | /* RFC4303: Drop dummy packets without any error */ |
| 256 | if (err == IPPROTO_NONE) |
| 257 | err = -EINVAL; |
| 258 | |
| 259 | out: |
| 260 | return err; |
| 261 | } |
| 262 | |
| 263 | static void esp_input_done(struct crypto_async_request *base, int err) |
| 264 | { |
| 265 | struct sk_buff *skb = base->data; |
| 266 | |
| 267 | xfrm_input_resume(skb, esp_input_done2(skb, err)); |
| 268 | } |
| 269 | |
Herbert Xu | e695633 | 2006-04-01 00:52:46 -0800 | [diff] [blame] | 270 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 272 | struct ip_esp_hdr *esph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | struct esp_data *esp = x->data; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 274 | struct crypto_aead *aead = esp->aead; |
| 275 | struct aead_request *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | struct sk_buff *trailer; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 277 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | int nfrags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | int ret = 0; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 280 | void *tmp; |
| 281 | u8 *iv; |
| 282 | struct scatterlist *sg; |
| 283 | struct scatterlist *asg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 285 | if (!pskb_may_pull(skb, sizeof(*esph))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | ret = -EINVAL; |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 287 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 290 | if (elen <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | ret = -EINVAL; |
Herbert Xu | 31a4ab9 | 2006-05-27 23:06:13 -0700 | [diff] [blame] | 292 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { |
| 296 | ret = -EINVAL; |
| 297 | goto out; |
| 298 | } |
| 299 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 300 | ret = -ENOMEM; |
| 301 | tmp = esp_alloc_tmp(aead, nfrags + 1); |
| 302 | if (!tmp) |
Herbert Xu | 0ebea8e | 2007-11-13 21:45:58 -0800 | [diff] [blame] | 303 | goto out; |
| 304 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 305 | ESP_SKB_CB(skb)->tmp = tmp; |
| 306 | iv = esp_tmp_iv(aead, tmp); |
| 307 | req = esp_tmp_req(aead, iv); |
| 308 | asg = esp_req_sg(aead, req); |
| 309 | sg = asg + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 311 | skb->ip_summed = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 313 | esph = (struct ip_esp_hdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 315 | /* Get ivec. This can be wrong, check against another impls. */ |
| 316 | iv = esph->enc_data; |
Thomas Graf | 95a02cf | 2007-12-10 16:53:29 -0800 | [diff] [blame] | 317 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 318 | sg_init_table(sg, nfrags); |
| 319 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); |
| 320 | sg_init_one(asg, esph, sizeof(*esph)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 322 | aead_request_set_callback(req, 0, esp_input_done, skb); |
| 323 | aead_request_set_crypt(req, sg, sg, elen, iv); |
| 324 | aead_request_set_assoc(req, asg, sizeof(*esph)); |
| 325 | |
| 326 | ret = crypto_aead_decrypt(req); |
| 327 | if (ret == -EINPROGRESS) |
| 328 | goto out; |
| 329 | |
| 330 | ret = esp_input_done2(skb, ret); |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return ret; |
| 334 | } |
| 335 | |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 336 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
| 338 | struct esp_data *esp = x->data; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 339 | u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); |
| 340 | u32 align = max_t(u32, blksize, esp->padlen); |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 341 | u32 rem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 343 | mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 344 | rem = mtu & (align - 1); |
| 345 | mtu &= ~(align - 1); |
| 346 | |
| 347 | if (x->props.mode != XFRM_MODE_TUNNEL) { |
Herbert Xu | d4875b0 | 2005-10-10 21:11:34 -0700 | [diff] [blame] | 348 | u32 padsize = ((blksize - 1) & 7) + 1; |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 349 | mtu -= blksize - padsize; |
| 350 | mtu += min_t(u32, blksize - padsize, rem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 353 | return mtu - 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 357 | int type, int code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 360 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | struct xfrm_state *x; |
| 362 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 363 | if (type != ICMPV6_DEST_UNREACH && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | type != ICMPV6_PKT_TOOBIG) |
| 365 | return; |
| 366 | |
| 367 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); |
| 368 | if (!x) |
| 369 | return; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 370 | printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | ntohl(esph->spi), NIP6(iph->daddr)); |
| 372 | xfrm_state_put(x); |
| 373 | } |
| 374 | |
| 375 | static void esp6_destroy(struct xfrm_state *x) |
| 376 | { |
| 377 | struct esp_data *esp = x->data; |
| 378 | |
| 379 | if (!esp) |
| 380 | return; |
| 381 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 382 | crypto_free_aead(esp->aead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | kfree(esp); |
| 384 | } |
| 385 | |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 386 | static int esp_init_aead(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 388 | struct esp_data *esp = x->data; |
| 389 | struct crypto_aead *aead; |
| 390 | int err; |
| 391 | |
| 392 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); |
| 393 | err = PTR_ERR(aead); |
| 394 | if (IS_ERR(aead)) |
| 395 | goto error; |
| 396 | |
| 397 | esp->aead = aead; |
| 398 | |
| 399 | err = crypto_aead_setkey(aead, x->aead->alg_key, |
| 400 | (x->aead->alg_key_len + 7) / 8); |
| 401 | if (err) |
| 402 | goto error; |
| 403 | |
| 404 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); |
| 405 | if (err) |
| 406 | goto error; |
| 407 | |
| 408 | error: |
| 409 | return err; |
| 410 | } |
| 411 | |
| 412 | static int esp_init_authenc(struct xfrm_state *x) |
| 413 | { |
| 414 | struct esp_data *esp = x->data; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 415 | struct crypto_aead *aead; |
| 416 | struct crypto_authenc_key_param *param; |
| 417 | struct rtattr *rta; |
| 418 | char *key; |
| 419 | char *p; |
| 420 | char authenc_name[CRYPTO_MAX_ALG_NAME]; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 421 | unsigned int keylen; |
| 422 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 424 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | if (x->ealg == NULL) |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 426 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 428 | err = -ENAMETOOLONG; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 429 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)", |
| 430 | x->aalg ? x->aalg->alg_name : "digest_null", |
| 431 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 432 | goto error; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 433 | |
| 434 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
| 435 | err = PTR_ERR(aead); |
| 436 | if (IS_ERR(aead)) |
| 437 | goto error; |
| 438 | |
| 439 | esp->aead = aead; |
| 440 | |
| 441 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + |
| 442 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); |
| 443 | err = -ENOMEM; |
| 444 | key = kmalloc(keylen, GFP_KERNEL); |
| 445 | if (!key) |
| 446 | goto error; |
| 447 | |
| 448 | p = key; |
| 449 | rta = (void *)p; |
| 450 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; |
| 451 | rta->rta_len = RTA_LENGTH(sizeof(*param)); |
| 452 | param = RTA_DATA(rta); |
| 453 | p += RTA_SPACE(sizeof(*param)); |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | if (x->aalg) { |
| 456 | struct xfrm_algo_desc *aalg_desc; |
| 457 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 458 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
| 459 | p += (x->aalg->alg_key_len + 7) / 8; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
| 462 | BUG_ON(!aalg_desc); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 463 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 464 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 466 | crypto_aead_authsize(aead)) { |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 467 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
| 468 | x->aalg->alg_name, |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 469 | crypto_aead_authsize(aead), |
Herbert Xu | 07d4ee5 | 2006-08-20 14:24:50 +1000 | [diff] [blame] | 470 | aalg_desc->uinfo.auth.icv_fullbits/8); |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 471 | goto free_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 473 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 474 | err = crypto_aead_setauthsize( |
| 475 | aead, aalg_desc->uinfo.auth.icv_truncbits / 8); |
| 476 | if (err) |
| 477 | goto free_key; |
| 478 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 479 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 480 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
| 481 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); |
| 482 | |
| 483 | err = crypto_aead_setkey(aead, key, keylen); |
| 484 | |
| 485 | free_key: |
| 486 | kfree(key); |
| 487 | |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 488 | error: |
| 489 | return err; |
| 490 | } |
| 491 | |
| 492 | static int esp6_init_state(struct xfrm_state *x) |
| 493 | { |
| 494 | struct esp_data *esp; |
| 495 | struct crypto_aead *aead; |
| 496 | u32 align; |
| 497 | int err; |
| 498 | |
| 499 | if (x->encap) |
| 500 | return -EINVAL; |
| 501 | |
| 502 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); |
| 503 | if (esp == NULL) |
| 504 | return -ENOMEM; |
| 505 | |
| 506 | x->data = esp; |
| 507 | |
| 508 | if (x->aead) |
| 509 | err = esp_init_aead(x); |
| 510 | else |
| 511 | err = esp_init_authenc(x); |
| 512 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 513 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | goto error; |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 515 | |
Herbert Xu | 1a6509d | 2008-01-28 19:37:29 -0800 | [diff] [blame] | 516 | aead = esp->aead; |
| 517 | |
| 518 | esp->padlen = 0; |
| 519 | |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 520 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
| 521 | crypto_aead_ivsize(aead); |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 522 | switch (x->props.mode) { |
| 523 | case XFRM_MODE_BEET: |
| 524 | case XFRM_MODE_TRANSPORT: |
| 525 | break; |
| 526 | case XFRM_MODE_TUNNEL: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | x->props.header_len += sizeof(struct ipv6hdr); |
Masahide NAKAMURA | ea2c47b | 2007-10-22 02:30:15 -0700 | [diff] [blame] | 528 | break; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 529 | default: |
| 530 | goto error; |
| 531 | } |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 532 | |
| 533 | align = ALIGN(crypto_aead_blocksize(aead), 4); |
| 534 | if (esp->padlen) |
| 535 | align = max_t(u32, align, esp->padlen); |
| 536 | x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | error: |
Herbert Xu | 38320c7 | 2008-01-28 19:35:05 -0800 | [diff] [blame] | 539 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Eric Dumazet | 533cb5b | 2008-01-30 19:11:50 -0800 | [diff] [blame] | 542 | static const struct xfrm_type esp6_type = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | { |
| 544 | .description = "ESP6", |
| 545 | .owner = THIS_MODULE, |
| 546 | .proto = IPPROTO_ESP, |
Herbert Xu | 436a0a4 | 2007-10-08 17:25:53 -0700 | [diff] [blame] | 547 | .flags = XFRM_TYPE_REPLAY_PROT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | .init_state = esp6_init_state, |
| 549 | .destructor = esp6_destroy, |
Patrick McHardy | c5c2523 | 2007-04-09 11:47:18 -0700 | [diff] [blame] | 550 | .get_mtu = esp6_get_mtu, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | .input = esp6_input, |
Masahide NAKAMURA | aee5adb | 2006-08-23 17:57:28 -0700 | [diff] [blame] | 552 | .output = esp6_output, |
| 553 | .hdr_offset = xfrm6_find_1stfragopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | }; |
| 555 | |
| 556 | static struct inet6_protocol esp6_protocol = { |
| 557 | .handler = xfrm6_rcv, |
| 558 | .err_handler = esp6_err, |
| 559 | .flags = INET6_PROTO_NOPOLICY, |
| 560 | }; |
| 561 | |
| 562 | static int __init esp6_init(void) |
| 563 | { |
| 564 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { |
| 565 | printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); |
| 566 | return -EAGAIN; |
| 567 | } |
| 568 | if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { |
| 569 | printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); |
| 570 | xfrm_unregister_type(&esp6_type, AF_INET6); |
| 571 | return -EAGAIN; |
| 572 | } |
| 573 | |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | static void __exit esp6_fini(void) |
| 578 | { |
| 579 | if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) |
| 580 | printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); |
| 581 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
| 582 | printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); |
| 583 | } |
| 584 | |
| 585 | module_init(esp6_init); |
| 586 | module_exit(esp6_fini); |
| 587 | |
| 588 | MODULE_LICENSE("GPL"); |
Masahide NAKAMURA | d3d6dd3 | 2007-06-26 23:57:49 -0700 | [diff] [blame] | 589 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |