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> 371da177e4SLinus Torvalds #include <net/icmp.h> 381da177e4SLinus Torvalds #include <net/ipv6.h> 3914c85021SArnaldo Carvalho de Melo #include <net/protocol.h> 401da177e4SLinus Torvalds #include <linux/icmpv6.h> 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 431da177e4SLinus Torvalds { 441da177e4SLinus Torvalds int err; 451da177e4SLinus Torvalds struct ipv6hdr *top_iph; 461da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 476b7326c8SHerbert Xu struct crypto_blkcipher *tfm; 486b7326c8SHerbert Xu struct blkcipher_desc desc; 491da177e4SLinus Torvalds struct sk_buff *trailer; 501da177e4SLinus Torvalds int blksize; 511da177e4SLinus Torvalds int clen; 521da177e4SLinus Torvalds int alen; 531da177e4SLinus Torvalds int nfrags; 54ea2ae17dSArnaldo Carvalho de Melo struct esp_data *esp = x->data; 55ea2ae17dSArnaldo Carvalho de Melo int hdr_len = (skb_transport_offset(skb) + 56ea2ae17dSArnaldo Carvalho de Melo sizeof(*esph) + esp->conf.ivlen); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* Strip IP+ESP header. */ 591da177e4SLinus Torvalds __skb_pull(skb, hdr_len); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds /* Now skb is pure payload to encrypt */ 621da177e4SLinus Torvalds err = -ENOMEM; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* Round to block size */ 651da177e4SLinus Torvalds clen = skb->len; 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds alen = esp->auth.icv_trunc_len; 681da177e4SLinus Torvalds tfm = esp->conf.tfm; 696b7326c8SHerbert Xu desc.tfm = tfm; 706b7326c8SHerbert Xu desc.flags = 0; 716b7326c8SHerbert Xu blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); 72a02a6422SHerbert Xu clen = ALIGN(clen + 2, blksize); 731da177e4SLinus Torvalds if (esp->conf.padlen) 74a02a6422SHerbert Xu clen = ALIGN(clen, esp->conf.padlen); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) { 771da177e4SLinus Torvalds goto error; 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* Fill padding... */ 811da177e4SLinus Torvalds do { 821da177e4SLinus Torvalds int i; 831da177e4SLinus Torvalds for (i=0; i<clen-skb->len - 2; i++) 841da177e4SLinus Torvalds *(u8*)(trailer->tail + i) = i+1; 851da177e4SLinus Torvalds } while (0); 861da177e4SLinus Torvalds *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2; 871da177e4SLinus Torvalds pskb_put(skb, trailer, clen - skb->len); 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len); 909c70220bSArnaldo Carvalho de Melo esph = (struct ipv6_esp_hdr *)skb_transport_header(skb); 911da177e4SLinus Torvalds top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph)); 92d56f90a7SArnaldo Carvalho de Melo *(u8 *)(trailer->tail - 1) = *skb_network_header(skb); 93d56f90a7SArnaldo Carvalho de Melo *skb_network_header(skb) = IPPROTO_ESP; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds esph->spi = x->id.spi; 961da177e4SLinus Torvalds esph->seq_no = htonl(++x->replay.oseq); 979500e8a8SJamal Hadi Salim xfrm_aevent_doreplay(x); 981da177e4SLinus Torvalds 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) 1131da177e4SLinus Torvalds goto error; 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)) 1226b7326c8SHerbert Xu goto error; 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 1351da177e4SLinus Torvalds error: 1361da177e4SLinus Torvalds return err; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 139e695633eSHerbert Xu static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds struct ipv6hdr *iph; 1421da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 1431da177e4SLinus Torvalds struct esp_data *esp = x->data; 1446b7326c8SHerbert Xu struct crypto_blkcipher *tfm = esp->conf.tfm; 1456b7326c8SHerbert Xu struct blkcipher_desc desc = { .tfm = tfm }; 1461da177e4SLinus Torvalds struct sk_buff *trailer; 1476b7326c8SHerbert Xu int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); 1481da177e4SLinus Torvalds int alen = esp->auth.icv_trunc_len; 1491da177e4SLinus Torvalds int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds int hdr_len = skb->h.raw - skb->nh.raw; 1521da177e4SLinus Torvalds int nfrags; 1531da177e4SLinus Torvalds int ret = 0; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) { 1561da177e4SLinus Torvalds ret = -EINVAL; 15731a4ab93SHerbert Xu goto out; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds if (elen <= 0 || (elen & (blksize-1))) { 1611da177e4SLinus Torvalds ret = -EINVAL; 16231a4ab93SHerbert Xu goto out; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* If integrity check is required, do this. */ 1661da177e4SLinus Torvalds if (esp->auth.icv_full_len) { 16707d4ee58SHerbert Xu u8 sum[alen]; 1681da177e4SLinus Torvalds 16907d4ee58SHerbert Xu ret = esp_mac_digest(esp, skb, 0, skb->len - alen); 17007d4ee58SHerbert Xu if (ret) 17107d4ee58SHerbert Xu goto out; 1721da177e4SLinus Torvalds 17307d4ee58SHerbert Xu if (skb_copy_bits(skb, skb->len - alen, sum, alen)) 1741da177e4SLinus Torvalds BUG(); 1751da177e4SLinus Torvalds 17607d4ee58SHerbert Xu if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { 1771da177e4SLinus Torvalds x->stats.integrity_failed++; 1781da177e4SLinus Torvalds ret = -EINVAL; 1791da177e4SLinus Torvalds goto out; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { 1841da177e4SLinus Torvalds ret = -EINVAL; 1851da177e4SLinus Torvalds goto out; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds esph = (struct ipv6_esp_hdr*)skb->data; 1910660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* Get ivec. This can be wrong, check against another impls. */ 1941da177e4SLinus Torvalds if (esp->conf.ivlen) 1956b7326c8SHerbert Xu crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds u8 nexthdr[2]; 1991da177e4SLinus Torvalds struct scatterlist *sg = &esp->sgbuf[0]; 2001da177e4SLinus Torvalds u8 padlen; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds if (unlikely(nfrags > ESP_NUM_FAST_SG)) { 2031da177e4SLinus Torvalds sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); 2041da177e4SLinus Torvalds if (!sg) { 2051da177e4SLinus Torvalds ret = -ENOMEM; 2061da177e4SLinus Torvalds goto out; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen); 2106b7326c8SHerbert Xu ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen); 2111da177e4SLinus Torvalds if (unlikely(sg != &esp->sgbuf[0])) 2121da177e4SLinus Torvalds kfree(sg); 2136b7326c8SHerbert Xu if (unlikely(ret)) 2146b7326c8SHerbert Xu goto out; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) 2171da177e4SLinus Torvalds BUG(); 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds padlen = nexthdr[0]; 2201da177e4SLinus Torvalds if (padlen+2 >= elen) { 22164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen); 2221da177e4SLinus Torvalds ret = -EINVAL; 2231da177e4SLinus Torvalds goto out; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds /* ... check padding bits here. Silly. :-) */ 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds pskb_trim(skb, skb->len - alen - padlen - 2); 2281da177e4SLinus Torvalds ret = nexthdr[1]; 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 231967b05f6SArnaldo Carvalho de Melo __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen); 232967b05f6SArnaldo Carvalho de Melo skb_set_transport_header(skb, -hdr_len); 2331da177e4SLinus Torvalds out: 2341da177e4SLinus Torvalds return ret; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds static u32 esp6_get_max_size(struct xfrm_state *x, int mtu) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds struct esp_data *esp = x->data; 2406b7326c8SHerbert Xu u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4); 2411da177e4SLinus Torvalds 2427e49e6deSMasahide NAKAMURA if (x->props.mode == XFRM_MODE_TUNNEL) { 243a02a6422SHerbert Xu mtu = ALIGN(mtu + 2, blksize); 2441da177e4SLinus Torvalds } else { 2451da177e4SLinus Torvalds /* The worst case. */ 246d4875b04SHerbert Xu u32 padsize = ((blksize - 1) & 7) + 1; 247d4875b04SHerbert Xu mtu = ALIGN(mtu + 2, padsize) + blksize - padsize; 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds if (esp->conf.padlen) 250a02a6422SHerbert Xu mtu = ALIGN(mtu, esp->conf.padlen); 2511da177e4SLinus Torvalds 25273d4f84fSKazunori MIYAZAWA return mtu + x->props.header_len + esp->auth.icv_trunc_len; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 25604ce6909SAl Viro int type, int code, int offset, __be32 info) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; 2591da177e4SLinus Torvalds struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset); 2601da177e4SLinus Torvalds struct xfrm_state *x; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds if (type != ICMPV6_DEST_UNREACH && 2631da177e4SLinus Torvalds type != ICMPV6_PKT_TOOBIG) 2641da177e4SLinus Torvalds return; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); 2671da177e4SLinus Torvalds if (!x) 2681da177e4SLinus Torvalds return; 26946b86a2dSJoe Perches printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n", 2701da177e4SLinus Torvalds ntohl(esph->spi), NIP6(iph->daddr)); 2711da177e4SLinus Torvalds xfrm_state_put(x); 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds static void esp6_destroy(struct xfrm_state *x) 2751da177e4SLinus Torvalds { 2761da177e4SLinus Torvalds struct esp_data *esp = x->data; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds if (!esp) 2791da177e4SLinus Torvalds return; 2801da177e4SLinus Torvalds 2816b7326c8SHerbert Xu crypto_free_blkcipher(esp->conf.tfm); 2821da177e4SLinus Torvalds esp->conf.tfm = NULL; 2831da177e4SLinus Torvalds kfree(esp->conf.ivec); 2841da177e4SLinus Torvalds esp->conf.ivec = NULL; 28507d4ee58SHerbert Xu crypto_free_hash(esp->auth.tfm); 2861da177e4SLinus Torvalds esp->auth.tfm = NULL; 2871da177e4SLinus Torvalds kfree(esp->auth.work_icv); 2881da177e4SLinus Torvalds esp->auth.work_icv = NULL; 2891da177e4SLinus Torvalds kfree(esp); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 29272cb6962SHerbert Xu static int esp6_init_state(struct xfrm_state *x) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds struct esp_data *esp = NULL; 2956b7326c8SHerbert Xu struct crypto_blkcipher *tfm; 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds /* null auth and encryption can have zero length keys */ 2981da177e4SLinus Torvalds if (x->aalg) { 2991da177e4SLinus Torvalds if (x->aalg->alg_key_len > 512) 3001da177e4SLinus Torvalds goto error; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds if (x->ealg == NULL) 3031da177e4SLinus Torvalds goto error; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if (x->encap) 3061da177e4SLinus Torvalds goto error; 3071da177e4SLinus Torvalds 3080c600edaSIngo Oeser esp = kzalloc(sizeof(*esp), GFP_KERNEL); 3091da177e4SLinus Torvalds if (esp == NULL) 3101da177e4SLinus Torvalds return -ENOMEM; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds if (x->aalg) { 3131da177e4SLinus Torvalds struct xfrm_algo_desc *aalg_desc; 31407d4ee58SHerbert Xu struct crypto_hash *hash; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds esp->auth.key = x->aalg->alg_key; 3171da177e4SLinus Torvalds esp->auth.key_len = (x->aalg->alg_key_len+7)/8; 31807d4ee58SHerbert Xu hash = crypto_alloc_hash(x->aalg->alg_name, 0, 31907d4ee58SHerbert Xu CRYPTO_ALG_ASYNC); 32007d4ee58SHerbert Xu if (IS_ERR(hash)) 3211da177e4SLinus Torvalds goto error; 32207d4ee58SHerbert Xu 32307d4ee58SHerbert Xu esp->auth.tfm = hash; 32407d4ee58SHerbert Xu if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len)) 32507d4ee58SHerbert Xu goto error; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 3281da177e4SLinus Torvalds BUG_ON(!aalg_desc); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds if (aalg_desc->uinfo.auth.icv_fullbits/8 != 33107d4ee58SHerbert Xu crypto_hash_digestsize(hash)) { 33207d4ee58SHerbert Xu NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", 3331da177e4SLinus Torvalds x->aalg->alg_name, 33407d4ee58SHerbert Xu crypto_hash_digestsize(hash), 3351da177e4SLinus Torvalds aalg_desc->uinfo.auth.icv_fullbits/8); 3361da177e4SLinus Torvalds goto error; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; 3401da177e4SLinus Torvalds esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL); 3431da177e4SLinus Torvalds if (!esp->auth.work_icv) 3441da177e4SLinus Torvalds goto error; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds esp->conf.key = x->ealg->alg_key; 3471da177e4SLinus Torvalds esp->conf.key_len = (x->ealg->alg_key_len+7)/8; 3486b7326c8SHerbert Xu tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC); 3496b7326c8SHerbert Xu if (IS_ERR(tfm)) 3501da177e4SLinus Torvalds goto error; 3516b7326c8SHerbert Xu esp->conf.tfm = tfm; 3526b7326c8SHerbert Xu esp->conf.ivlen = crypto_blkcipher_ivsize(tfm); 3531da177e4SLinus Torvalds esp->conf.padlen = 0; 3541da177e4SLinus Torvalds if (esp->conf.ivlen) { 3551da177e4SLinus Torvalds esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL); 3561da177e4SLinus Torvalds if (unlikely(esp->conf.ivec == NULL)) 3571da177e4SLinus Torvalds goto error; 358e4bec827SDavid S. Miller esp->conf.ivinitted = 0; 3591da177e4SLinus Torvalds } 3606b7326c8SHerbert Xu if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len)) 3611da177e4SLinus Torvalds goto error; 3621da177e4SLinus Torvalds x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen; 3637e49e6deSMasahide NAKAMURA if (x->props.mode == XFRM_MODE_TUNNEL) 3641da177e4SLinus Torvalds x->props.header_len += sizeof(struct ipv6hdr); 3651da177e4SLinus Torvalds x->data = esp; 3661da177e4SLinus Torvalds return 0; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds error: 3691da177e4SLinus Torvalds x->data = esp; 3701da177e4SLinus Torvalds esp6_destroy(x); 3711da177e4SLinus Torvalds x->data = NULL; 3721da177e4SLinus Torvalds return -EINVAL; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds static struct xfrm_type esp6_type = 3761da177e4SLinus Torvalds { 3771da177e4SLinus Torvalds .description = "ESP6", 3781da177e4SLinus Torvalds .owner = THIS_MODULE, 3791da177e4SLinus Torvalds .proto = IPPROTO_ESP, 3801da177e4SLinus Torvalds .init_state = esp6_init_state, 3811da177e4SLinus Torvalds .destructor = esp6_destroy, 3821da177e4SLinus Torvalds .get_max_size = esp6_get_max_size, 3831da177e4SLinus Torvalds .input = esp6_input, 384aee5adb4SMasahide NAKAMURA .output = esp6_output, 385aee5adb4SMasahide NAKAMURA .hdr_offset = xfrm6_find_1stfragopt, 3861da177e4SLinus Torvalds }; 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds static struct inet6_protocol esp6_protocol = { 3891da177e4SLinus Torvalds .handler = xfrm6_rcv, 3901da177e4SLinus Torvalds .err_handler = esp6_err, 3911da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY, 3921da177e4SLinus Torvalds }; 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds static int __init esp6_init(void) 3951da177e4SLinus Torvalds { 3961da177e4SLinus Torvalds if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { 3971da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); 3981da177e4SLinus Torvalds return -EAGAIN; 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { 4011da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); 4021da177e4SLinus Torvalds xfrm_unregister_type(&esp6_type, AF_INET6); 4031da177e4SLinus Torvalds return -EAGAIN; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds return 0; 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds static void __exit esp6_fini(void) 4101da177e4SLinus Torvalds { 4111da177e4SLinus Torvalds if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) 4121da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); 4131da177e4SLinus Torvalds if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) 4141da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds module_init(esp6_init); 4181da177e4SLinus Torvalds module_exit(esp6_fini); 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 421