11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C)2002 USAGI/WIDE Project 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 51da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 61da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 71da177e4SLinus Torvalds * (at your option) any later version. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 101da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 111da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 121da177e4SLinus Torvalds * GNU General Public License for more details. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 151da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 161da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * Authors 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * Mitsuru KANDA @USAGI : IPv6 Support 211da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI : 221da177e4SLinus Torvalds * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * This file is derived from net/ipv4/esp.c 251da177e4SLinus Torvalds */ 261da177e4SLinus Torvalds 276b7326c8SHerbert Xu #include <linux/err.h> 281da177e4SLinus Torvalds #include <linux/module.h> 291da177e4SLinus Torvalds #include <net/ip.h> 301da177e4SLinus Torvalds #include <net/xfrm.h> 311da177e4SLinus Torvalds #include <net/esp.h> 321da177e4SLinus Torvalds #include <asm/scatterlist.h> 331da177e4SLinus Torvalds #include <linux/crypto.h> 34a02a6422SHerbert Xu #include <linux/kernel.h> 351da177e4SLinus Torvalds #include <linux/pfkeyv2.h> 361da177e4SLinus Torvalds #include <linux/random.h> 37b7c6538cSHerbert Xu #include <linux/spinlock.h> 381da177e4SLinus Torvalds #include <net/icmp.h> 391da177e4SLinus Torvalds #include <net/ipv6.h> 4014c85021SArnaldo Carvalho de Melo #include <net/protocol.h> 411da177e4SLinus Torvalds #include <linux/icmpv6.h> 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 441da177e4SLinus Torvalds { 451da177e4SLinus Torvalds int err; 461da177e4SLinus Torvalds struct ipv6hdr *top_iph; 471da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 486b7326c8SHerbert Xu struct crypto_blkcipher *tfm; 496b7326c8SHerbert Xu struct blkcipher_desc desc; 501da177e4SLinus Torvalds struct sk_buff *trailer; 511da177e4SLinus Torvalds int blksize; 521da177e4SLinus Torvalds int clen; 531da177e4SLinus Torvalds int alen; 541da177e4SLinus Torvalds int nfrags; 5527a884dcSArnaldo Carvalho de Melo u8 *tail; 56ea2ae17dSArnaldo Carvalho de Melo struct esp_data *esp = x->data; 571da177e4SLinus Torvalds 587b277b1aSHerbert Xu /* skb is pure payload to encrypt */ 591da177e4SLinus Torvalds err = -ENOMEM; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds /* Round to block size */ 621da177e4SLinus Torvalds clen = skb->len; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds alen = esp->auth.icv_trunc_len; 651da177e4SLinus Torvalds tfm = esp->conf.tfm; 666b7326c8SHerbert Xu desc.tfm = tfm; 676b7326c8SHerbert Xu desc.flags = 0; 686b7326c8SHerbert Xu blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); 69a02a6422SHerbert Xu clen = ALIGN(clen + 2, blksize); 701da177e4SLinus Torvalds if (esp->conf.padlen) 71a02a6422SHerbert Xu clen = ALIGN(clen, esp->conf.padlen); 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) { 741da177e4SLinus Torvalds goto error; 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds /* Fill padding... */ 7827a884dcSArnaldo Carvalho de Melo tail = skb_tail_pointer(trailer); 791da177e4SLinus Torvalds do { 801da177e4SLinus Torvalds int i; 811da177e4SLinus Torvalds for (i=0; i<clen-skb->len - 2; i++) 8227a884dcSArnaldo Carvalho de Melo tail[i] = i + 1; 831da177e4SLinus Torvalds } while (0); 8427a884dcSArnaldo Carvalho de Melo tail[clen-skb->len - 2] = (clen - skb->len) - 2; 851da177e4SLinus Torvalds pskb_put(skb, trailer, clen - skb->len); 861da177e4SLinus Torvalds 877b277b1aSHerbert Xu skb_push(skb, -skb_network_offset(skb)); 88007f0211SHerbert Xu top_iph = ipv6_hdr(skb); 899c70220bSArnaldo Carvalho de Melo esph = (struct ipv6_esp_hdr *)skb_transport_header(skb); 901da177e4SLinus Torvalds top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph)); 91007f0211SHerbert Xu *(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb); 92007f0211SHerbert Xu *skb_mac_header(skb) = IPPROTO_ESP; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds esph->spi = x->id.spi; 95436a0a40SHerbert Xu esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq); 961da177e4SLinus Torvalds 97b7c6538cSHerbert Xu spin_lock_bh(&x->lock); 98b7c6538cSHerbert Xu 99e4bec827SDavid S. Miller if (esp->conf.ivlen) { 100e4bec827SDavid S. Miller if (unlikely(!esp->conf.ivinitted)) { 101e4bec827SDavid S. Miller get_random_bytes(esp->conf.ivec, esp->conf.ivlen); 102e4bec827SDavid S. Miller esp->conf.ivinitted = 1; 103e4bec827SDavid S. Miller } 1046b7326c8SHerbert Xu crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen); 105e4bec827SDavid S. Miller } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds do { 1081da177e4SLinus Torvalds struct scatterlist *sg = &esp->sgbuf[0]; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds if (unlikely(nfrags > ESP_NUM_FAST_SG)) { 1111da177e4SLinus Torvalds sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); 1121da177e4SLinus Torvalds if (!sg) 113b7c6538cSHerbert Xu goto unlock; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen); 1166b7326c8SHerbert Xu err = crypto_blkcipher_encrypt(&desc, sg, sg, clen); 1171da177e4SLinus Torvalds if (unlikely(sg != &esp->sgbuf[0])) 1181da177e4SLinus Torvalds kfree(sg); 1191da177e4SLinus Torvalds } while (0); 1201da177e4SLinus Torvalds 1216b7326c8SHerbert Xu if (unlikely(err)) 122b7c6538cSHerbert Xu goto unlock; 1236b7326c8SHerbert Xu 1241da177e4SLinus Torvalds if (esp->conf.ivlen) { 1256b7326c8SHerbert Xu memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen); 1266b7326c8SHerbert Xu crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen); 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds if (esp->auth.icv_full_len) { 13007d4ee58SHerbert Xu err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data, 13107d4ee58SHerbert Xu sizeof(*esph) + esp->conf.ivlen + clen); 13207d4ee58SHerbert Xu memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 135b7c6538cSHerbert Xu unlock: 136b7c6538cSHerbert Xu spin_unlock_bh(&x->lock); 137b7c6538cSHerbert Xu 1381da177e4SLinus Torvalds error: 1391da177e4SLinus Torvalds return err; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 142e695633eSHerbert Xu static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) 1431da177e4SLinus Torvalds { 1441da177e4SLinus Torvalds struct ipv6hdr *iph; 1451da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 1461da177e4SLinus Torvalds struct esp_data *esp = x->data; 1476b7326c8SHerbert Xu struct crypto_blkcipher *tfm = esp->conf.tfm; 1486b7326c8SHerbert Xu struct blkcipher_desc desc = { .tfm = tfm }; 1491da177e4SLinus Torvalds struct sk_buff *trailer; 1506b7326c8SHerbert Xu int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); 1511da177e4SLinus Torvalds int alen = esp->auth.icv_trunc_len; 1521da177e4SLinus Torvalds int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen; 153cfe1fc77SArnaldo Carvalho de Melo int hdr_len = skb_network_header_len(skb); 1541da177e4SLinus Torvalds int nfrags; 1551da177e4SLinus Torvalds int ret = 0; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) { 1581da177e4SLinus Torvalds ret = -EINVAL; 15931a4ab93SHerbert Xu goto out; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds if (elen <= 0 || (elen & (blksize-1))) { 1631da177e4SLinus Torvalds ret = -EINVAL; 16431a4ab93SHerbert Xu goto out; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* If integrity check is required, do this. */ 1681da177e4SLinus Torvalds if (esp->auth.icv_full_len) { 16907d4ee58SHerbert Xu u8 sum[alen]; 1701da177e4SLinus Torvalds 17107d4ee58SHerbert Xu ret = esp_mac_digest(esp, skb, 0, skb->len - alen); 17207d4ee58SHerbert Xu if (ret) 17307d4ee58SHerbert Xu goto out; 1741da177e4SLinus Torvalds 17507d4ee58SHerbert Xu if (skb_copy_bits(skb, skb->len - alen, sum, alen)) 1761da177e4SLinus Torvalds BUG(); 1771da177e4SLinus Torvalds 17807d4ee58SHerbert Xu if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { 1791da177e4SLinus Torvalds x->stats.integrity_failed++; 1801da177e4SLinus Torvalds ret = -EINVAL; 1811da177e4SLinus Torvalds goto out; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { 1861da177e4SLinus Torvalds ret = -EINVAL; 1871da177e4SLinus Torvalds goto out; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds esph = (struct ipv6_esp_hdr*)skb->data; 1930660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* Get ivec. This can be wrong, check against another impls. */ 1961da177e4SLinus Torvalds if (esp->conf.ivlen) 1976b7326c8SHerbert Xu crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen); 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds u8 nexthdr[2]; 2011da177e4SLinus Torvalds struct scatterlist *sg = &esp->sgbuf[0]; 2021da177e4SLinus Torvalds u8 padlen; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds if (unlikely(nfrags > ESP_NUM_FAST_SG)) { 2051da177e4SLinus Torvalds sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); 2061da177e4SLinus Torvalds if (!sg) { 2071da177e4SLinus Torvalds ret = -ENOMEM; 2081da177e4SLinus Torvalds goto out; 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen); 2126b7326c8SHerbert Xu ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen); 2131da177e4SLinus Torvalds if (unlikely(sg != &esp->sgbuf[0])) 2141da177e4SLinus Torvalds kfree(sg); 2156b7326c8SHerbert Xu if (unlikely(ret)) 2166b7326c8SHerbert Xu goto out; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) 2191da177e4SLinus Torvalds BUG(); 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds padlen = nexthdr[0]; 2221da177e4SLinus Torvalds if (padlen+2 >= elen) { 22364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen); 2241da177e4SLinus Torvalds ret = -EINVAL; 2251da177e4SLinus Torvalds goto out; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds /* ... check padding bits here. Silly. :-) */ 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds pskb_trim(skb, skb->len - alen - padlen - 2); 2301da177e4SLinus Torvalds ret = nexthdr[1]; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds 233967b05f6SArnaldo Carvalho de Melo __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen); 234967b05f6SArnaldo Carvalho de Melo skb_set_transport_header(skb, -hdr_len); 2351da177e4SLinus Torvalds out: 2361da177e4SLinus Torvalds return ret; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 239c5c25238SPatrick McHardy static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct esp_data *esp = x->data; 2426b7326c8SHerbert Xu u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4); 243c5c25238SPatrick McHardy u32 align = max_t(u32, blksize, esp->conf.padlen); 244c5c25238SPatrick McHardy u32 rem; 2451da177e4SLinus Torvalds 246c5c25238SPatrick McHardy mtu -= x->props.header_len + esp->auth.icv_trunc_len; 247c5c25238SPatrick McHardy rem = mtu & (align - 1); 248c5c25238SPatrick McHardy mtu &= ~(align - 1); 249c5c25238SPatrick McHardy 250c5c25238SPatrick McHardy if (x->props.mode != XFRM_MODE_TUNNEL) { 251d4875b04SHerbert Xu u32 padsize = ((blksize - 1) & 7) + 1; 252c5c25238SPatrick McHardy mtu -= blksize - padsize; 253c5c25238SPatrick McHardy mtu += min_t(u32, blksize - padsize, rem); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 256c5c25238SPatrick McHardy return mtu - 2; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 26004ce6909SAl Viro int type, int code, int offset, __be32 info) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; 2631da177e4SLinus Torvalds struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset); 2641da177e4SLinus Torvalds struct xfrm_state *x; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds if (type != ICMPV6_DEST_UNREACH && 2671da177e4SLinus Torvalds type != ICMPV6_PKT_TOOBIG) 2681da177e4SLinus Torvalds return; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); 2711da177e4SLinus Torvalds if (!x) 2721da177e4SLinus Torvalds return; 27346b86a2dSJoe Perches printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n", 2741da177e4SLinus Torvalds ntohl(esph->spi), NIP6(iph->daddr)); 2751da177e4SLinus Torvalds xfrm_state_put(x); 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds static void esp6_destroy(struct xfrm_state *x) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds struct esp_data *esp = x->data; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds if (!esp) 2831da177e4SLinus Torvalds return; 2841da177e4SLinus Torvalds 2856b7326c8SHerbert Xu crypto_free_blkcipher(esp->conf.tfm); 2861da177e4SLinus Torvalds esp->conf.tfm = NULL; 2871da177e4SLinus Torvalds kfree(esp->conf.ivec); 2881da177e4SLinus Torvalds esp->conf.ivec = NULL; 28907d4ee58SHerbert Xu crypto_free_hash(esp->auth.tfm); 2901da177e4SLinus Torvalds esp->auth.tfm = NULL; 2911da177e4SLinus Torvalds kfree(esp->auth.work_icv); 2921da177e4SLinus Torvalds esp->auth.work_icv = NULL; 2931da177e4SLinus Torvalds kfree(esp); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 29672cb6962SHerbert Xu static int esp6_init_state(struct xfrm_state *x) 2971da177e4SLinus Torvalds { 2981da177e4SLinus Torvalds struct esp_data *esp = NULL; 2996b7326c8SHerbert Xu struct crypto_blkcipher *tfm; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds if (x->ealg == NULL) 3021da177e4SLinus Torvalds goto error; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds if (x->encap) 3051da177e4SLinus Torvalds goto error; 3061da177e4SLinus Torvalds 3070c600edaSIngo Oeser esp = kzalloc(sizeof(*esp), GFP_KERNEL); 3081da177e4SLinus Torvalds if (esp == NULL) 3091da177e4SLinus Torvalds return -ENOMEM; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds if (x->aalg) { 3121da177e4SLinus Torvalds struct xfrm_algo_desc *aalg_desc; 31307d4ee58SHerbert Xu struct crypto_hash *hash; 3141da177e4SLinus Torvalds 31507d4ee58SHerbert Xu hash = crypto_alloc_hash(x->aalg->alg_name, 0, 31607d4ee58SHerbert Xu CRYPTO_ALG_ASYNC); 31707d4ee58SHerbert Xu if (IS_ERR(hash)) 3181da177e4SLinus Torvalds goto error; 31907d4ee58SHerbert Xu 32007d4ee58SHerbert Xu esp->auth.tfm = hash; 3214b7137ffSHerbert Xu if (crypto_hash_setkey(hash, x->aalg->alg_key, 3224b7137ffSHerbert Xu (x->aalg->alg_key_len + 7) / 8)) 32307d4ee58SHerbert Xu goto error; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 3261da177e4SLinus Torvalds BUG_ON(!aalg_desc); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds if (aalg_desc->uinfo.auth.icv_fullbits/8 != 32907d4ee58SHerbert Xu crypto_hash_digestsize(hash)) { 33007d4ee58SHerbert Xu NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", 3311da177e4SLinus Torvalds x->aalg->alg_name, 33207d4ee58SHerbert Xu crypto_hash_digestsize(hash), 3331da177e4SLinus Torvalds aalg_desc->uinfo.auth.icv_fullbits/8); 3341da177e4SLinus Torvalds goto error; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; 3381da177e4SLinus Torvalds esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL); 3411da177e4SLinus Torvalds if (!esp->auth.work_icv) 3421da177e4SLinus Torvalds goto error; 3431da177e4SLinus Torvalds } 3446b7326c8SHerbert Xu tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC); 3456b7326c8SHerbert Xu if (IS_ERR(tfm)) 3461da177e4SLinus Torvalds goto error; 3476b7326c8SHerbert Xu esp->conf.tfm = tfm; 3486b7326c8SHerbert Xu esp->conf.ivlen = crypto_blkcipher_ivsize(tfm); 3491da177e4SLinus Torvalds esp->conf.padlen = 0; 3501da177e4SLinus Torvalds if (esp->conf.ivlen) { 3511da177e4SLinus Torvalds esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL); 3521da177e4SLinus Torvalds if (unlikely(esp->conf.ivec == NULL)) 3531da177e4SLinus Torvalds goto error; 354e4bec827SDavid S. Miller esp->conf.ivinitted = 0; 3551da177e4SLinus Torvalds } 3564b7137ffSHerbert Xu if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key, 3574b7137ffSHerbert Xu (x->ealg->alg_key_len + 7) / 8)) 3581da177e4SLinus Torvalds goto error; 3591da177e4SLinus Torvalds x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen; 3607e49e6deSMasahide NAKAMURA if (x->props.mode == XFRM_MODE_TUNNEL) 3611da177e4SLinus Torvalds x->props.header_len += sizeof(struct ipv6hdr); 3621da177e4SLinus Torvalds x->data = esp; 3631da177e4SLinus Torvalds return 0; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds error: 3661da177e4SLinus Torvalds x->data = esp; 3671da177e4SLinus Torvalds esp6_destroy(x); 3681da177e4SLinus Torvalds x->data = NULL; 3691da177e4SLinus Torvalds return -EINVAL; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds static struct xfrm_type esp6_type = 3731da177e4SLinus Torvalds { 3741da177e4SLinus Torvalds .description = "ESP6", 3751da177e4SLinus Torvalds .owner = THIS_MODULE, 3761da177e4SLinus Torvalds .proto = IPPROTO_ESP, 377436a0a40SHerbert Xu .flags = XFRM_TYPE_REPLAY_PROT, 3781da177e4SLinus Torvalds .init_state = esp6_init_state, 3791da177e4SLinus Torvalds .destructor = esp6_destroy, 380c5c25238SPatrick McHardy .get_mtu = esp6_get_mtu, 3811da177e4SLinus Torvalds .input = esp6_input, 382aee5adb4SMasahide NAKAMURA .output = esp6_output, 383aee5adb4SMasahide NAKAMURA .hdr_offset = xfrm6_find_1stfragopt, 3841da177e4SLinus Torvalds }; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static struct inet6_protocol esp6_protocol = { 3871da177e4SLinus Torvalds .handler = xfrm6_rcv, 3881da177e4SLinus Torvalds .err_handler = esp6_err, 3891da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY, 3901da177e4SLinus Torvalds }; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds static int __init esp6_init(void) 3931da177e4SLinus Torvalds { 3941da177e4SLinus Torvalds if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { 3951da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); 3961da177e4SLinus Torvalds return -EAGAIN; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { 3991da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); 4001da177e4SLinus Torvalds xfrm_unregister_type(&esp6_type, AF_INET6); 4011da177e4SLinus Torvalds return -EAGAIN; 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds return 0; 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds static void __exit esp6_fini(void) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) 4101da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); 4111da177e4SLinus Torvalds if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) 4121da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds module_init(esp6_init); 4161da177e4SLinus Torvalds module_exit(esp6_fini); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 419d3d6dd3aSMasahide NAKAMURA MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); 420