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 271da177e4SLinus Torvalds #include <linux/config.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> 391da177e4SLinus Torvalds #include <linux/icmpv6.h> 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 421da177e4SLinus Torvalds { 431da177e4SLinus Torvalds int err; 441da177e4SLinus Torvalds int hdr_len; 451da177e4SLinus Torvalds struct ipv6hdr *top_iph; 461da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 471da177e4SLinus Torvalds struct crypto_tfm *tfm; 481da177e4SLinus Torvalds struct esp_data *esp; 491da177e4SLinus Torvalds struct sk_buff *trailer; 501da177e4SLinus Torvalds int blksize; 511da177e4SLinus Torvalds int clen; 521da177e4SLinus Torvalds int alen; 531da177e4SLinus Torvalds int nfrags; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds esp = x->data; 561da177e4SLinus Torvalds hdr_len = skb->h.raw - skb->data + 571da177e4SLinus Torvalds sizeof(*esph) + esp->conf.ivlen; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds /* Strip IP+ESP header. */ 601da177e4SLinus Torvalds __skb_pull(skb, hdr_len); 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds /* Now skb is pure payload to encrypt */ 631da177e4SLinus Torvalds err = -ENOMEM; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* Round to block size */ 661da177e4SLinus Torvalds clen = skb->len; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds alen = esp->auth.icv_trunc_len; 691da177e4SLinus Torvalds tfm = esp->conf.tfm; 70a02a6422SHerbert Xu blksize = ALIGN(crypto_tfm_alg_blocksize(tfm), 4); 71a02a6422SHerbert Xu clen = ALIGN(clen + 2, blksize); 721da177e4SLinus Torvalds if (esp->conf.padlen) 73a02a6422SHerbert Xu clen = ALIGN(clen, esp->conf.padlen); 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) { 761da177e4SLinus Torvalds goto error; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* Fill padding... */ 801da177e4SLinus Torvalds do { 811da177e4SLinus Torvalds int i; 821da177e4SLinus Torvalds for (i=0; i<clen-skb->len - 2; i++) 831da177e4SLinus Torvalds *(u8*)(trailer->tail + i) = i+1; 841da177e4SLinus Torvalds } while (0); 851da177e4SLinus Torvalds *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2; 861da177e4SLinus Torvalds pskb_put(skb, trailer, clen - skb->len); 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len); 891da177e4SLinus Torvalds esph = (struct ipv6_esp_hdr *)skb->h.raw; 901da177e4SLinus Torvalds top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph)); 911da177e4SLinus Torvalds *(u8*)(trailer->tail - 1) = *skb->nh.raw; 921da177e4SLinus Torvalds *skb->nh.raw = IPPROTO_ESP; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds esph->spi = x->id.spi; 951da177e4SLinus Torvalds esph->seq_no = htonl(++x->replay.oseq); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds if (esp->conf.ivlen) 981da177e4SLinus Torvalds crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm)); 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds do { 1011da177e4SLinus Torvalds struct scatterlist *sg = &esp->sgbuf[0]; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds if (unlikely(nfrags > ESP_NUM_FAST_SG)) { 1041da177e4SLinus Torvalds sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); 1051da177e4SLinus Torvalds if (!sg) 1061da177e4SLinus Torvalds goto error; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen); 1091da177e4SLinus Torvalds crypto_cipher_encrypt(tfm, sg, sg, clen); 1101da177e4SLinus Torvalds if (unlikely(sg != &esp->sgbuf[0])) 1111da177e4SLinus Torvalds kfree(sg); 1121da177e4SLinus Torvalds } while (0); 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if (esp->conf.ivlen) { 1151da177e4SLinus Torvalds memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm)); 1161da177e4SLinus Torvalds crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm)); 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds if (esp->auth.icv_full_len) { 1201da177e4SLinus Torvalds esp->auth.icv(esp, skb, (u8*)esph-skb->data, 1211da177e4SLinus Torvalds sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail); 1221da177e4SLinus Torvalds pskb_put(skb, trailer, alen); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds err = 0; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds error: 1281da177e4SLinus Torvalds return err; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds static int esp6_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb) 1321da177e4SLinus Torvalds { 1331da177e4SLinus Torvalds struct ipv6hdr *iph; 1341da177e4SLinus Torvalds struct ipv6_esp_hdr *esph; 1351da177e4SLinus Torvalds struct esp_data *esp = x->data; 1361da177e4SLinus Torvalds struct sk_buff *trailer; 137*d4875b04SHerbert Xu int blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4); 1381da177e4SLinus Torvalds int alen = esp->auth.icv_trunc_len; 1391da177e4SLinus Torvalds int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds int hdr_len = skb->h.raw - skb->nh.raw; 1421da177e4SLinus Torvalds int nfrags; 1431da177e4SLinus Torvalds unsigned char *tmp_hdr = NULL; 1441da177e4SLinus Torvalds int ret = 0; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) { 1471da177e4SLinus Torvalds ret = -EINVAL; 1481da177e4SLinus Torvalds goto out_nofree; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds if (elen <= 0 || (elen & (blksize-1))) { 1521da177e4SLinus Torvalds ret = -EINVAL; 1531da177e4SLinus Torvalds goto out_nofree; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds tmp_hdr = kmalloc(hdr_len, GFP_ATOMIC); 1571da177e4SLinus Torvalds if (!tmp_hdr) { 1581da177e4SLinus Torvalds ret = -ENOMEM; 1591da177e4SLinus Torvalds goto out_nofree; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds memcpy(tmp_hdr, skb->nh.raw, hdr_len); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* If integrity check is required, do this. */ 1641da177e4SLinus Torvalds if (esp->auth.icv_full_len) { 1651da177e4SLinus Torvalds u8 sum[esp->auth.icv_full_len]; 1661da177e4SLinus Torvalds u8 sum1[alen]; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds esp->auth.icv(esp, skb, 0, skb->len-alen, sum); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds if (skb_copy_bits(skb, skb->len-alen, sum1, alen)) 1711da177e4SLinus Torvalds BUG(); 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds if (unlikely(memcmp(sum, sum1, alen))) { 1741da177e4SLinus Torvalds x->stats.integrity_failed++; 1751da177e4SLinus Torvalds ret = -EINVAL; 1761da177e4SLinus Torvalds goto out; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { 1811da177e4SLinus Torvalds ret = -EINVAL; 1821da177e4SLinus Torvalds goto out; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds esph = (struct ipv6_esp_hdr*)skb->data; 1881da177e4SLinus Torvalds iph = skb->nh.ipv6h; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* Get ivec. This can be wrong, check against another impls. */ 1911da177e4SLinus Torvalds if (esp->conf.ivlen) 1921da177e4SLinus Torvalds crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm)); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds u8 nexthdr[2]; 1961da177e4SLinus Torvalds struct scatterlist *sg = &esp->sgbuf[0]; 1971da177e4SLinus Torvalds u8 padlen; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds if (unlikely(nfrags > ESP_NUM_FAST_SG)) { 2001da177e4SLinus Torvalds sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); 2011da177e4SLinus Torvalds if (!sg) { 2021da177e4SLinus Torvalds ret = -ENOMEM; 2031da177e4SLinus Torvalds goto out; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen); 2071da177e4SLinus Torvalds crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen); 2081da177e4SLinus Torvalds if (unlikely(sg != &esp->sgbuf[0])) 2091da177e4SLinus Torvalds kfree(sg); 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) 2121da177e4SLinus Torvalds BUG(); 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds padlen = nexthdr[0]; 2151da177e4SLinus Torvalds if (padlen+2 >= elen) { 21664ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen); 2171da177e4SLinus Torvalds ret = -EINVAL; 2181da177e4SLinus Torvalds goto out; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds /* ... check padding bits here. Silly. :-) */ 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds pskb_trim(skb, skb->len - alen - padlen - 2); 2231da177e4SLinus Torvalds skb->h.raw = skb_pull(skb, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen); 2241da177e4SLinus Torvalds skb->nh.raw += sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen; 2251da177e4SLinus Torvalds memcpy(skb->nh.raw, tmp_hdr, hdr_len); 2261da177e4SLinus Torvalds skb->nh.ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 2271da177e4SLinus Torvalds ret = nexthdr[1]; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds out: 2311da177e4SLinus Torvalds kfree(tmp_hdr); 2321da177e4SLinus Torvalds out_nofree: 2331da177e4SLinus Torvalds return ret; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds static u32 esp6_get_max_size(struct xfrm_state *x, int mtu) 2371da177e4SLinus Torvalds { 2381da177e4SLinus Torvalds struct esp_data *esp = x->data; 239*d4875b04SHerbert Xu u32 blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds if (x->props.mode) { 242a02a6422SHerbert Xu mtu = ALIGN(mtu + 2, blksize); 2431da177e4SLinus Torvalds } else { 2441da177e4SLinus Torvalds /* The worst case. */ 245*d4875b04SHerbert Xu u32 padsize = ((blksize - 1) & 7) + 1; 246*d4875b04SHerbert Xu mtu = ALIGN(mtu + 2, padsize) + blksize - padsize; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds if (esp->conf.padlen) 249a02a6422SHerbert Xu mtu = ALIGN(mtu, esp->conf.padlen); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds return mtu + x->props.header_len + esp->auth.icv_full_len; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 2551da177e4SLinus Torvalds int type, int code, int offset, __u32 info) 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; 2581da177e4SLinus Torvalds struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset); 2591da177e4SLinus Torvalds struct xfrm_state *x; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds if (type != ICMPV6_DEST_UNREACH && 2621da177e4SLinus Torvalds type != ICMPV6_PKT_TOOBIG) 2631da177e4SLinus Torvalds return; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); 2661da177e4SLinus Torvalds if (!x) 2671da177e4SLinus Torvalds return; 2681da177e4SLinus Torvalds printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" 2691da177e4SLinus Torvalds "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\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 2811da177e4SLinus Torvalds crypto_free_tfm(esp->conf.tfm); 2821da177e4SLinus Torvalds esp->conf.tfm = NULL; 2831da177e4SLinus Torvalds kfree(esp->conf.ivec); 2841da177e4SLinus Torvalds esp->conf.ivec = NULL; 2851da177e4SLinus Torvalds crypto_free_tfm(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; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* null auth and encryption can have zero length keys */ 2971da177e4SLinus Torvalds if (x->aalg) { 2981da177e4SLinus Torvalds if (x->aalg->alg_key_len > 512) 2991da177e4SLinus Torvalds goto error; 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 3071da177e4SLinus Torvalds esp = kmalloc(sizeof(*esp), GFP_KERNEL); 3081da177e4SLinus Torvalds if (esp == NULL) 3091da177e4SLinus Torvalds return -ENOMEM; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds memset(esp, 0, sizeof(*esp)); 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds if (x->aalg) { 3141da177e4SLinus Torvalds struct xfrm_algo_desc *aalg_desc; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds esp->auth.key = x->aalg->alg_key; 3171da177e4SLinus Torvalds esp->auth.key_len = (x->aalg->alg_key_len+7)/8; 3181da177e4SLinus Torvalds esp->auth.tfm = crypto_alloc_tfm(x->aalg->alg_name, 0); 3191da177e4SLinus Torvalds if (esp->auth.tfm == NULL) 3201da177e4SLinus Torvalds goto error; 3211da177e4SLinus Torvalds esp->auth.icv = esp_hmac_digest; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 3241da177e4SLinus Torvalds BUG_ON(!aalg_desc); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds if (aalg_desc->uinfo.auth.icv_fullbits/8 != 3271da177e4SLinus Torvalds crypto_tfm_alg_digestsize(esp->auth.tfm)) { 3281da177e4SLinus Torvalds printk(KERN_INFO "ESP: %s digestsize %u != %hu\n", 3291da177e4SLinus Torvalds x->aalg->alg_name, 3301da177e4SLinus Torvalds crypto_tfm_alg_digestsize(esp->auth.tfm), 3311da177e4SLinus Torvalds aalg_desc->uinfo.auth.icv_fullbits/8); 3321da177e4SLinus Torvalds goto error; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; 3361da177e4SLinus Torvalds esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL); 3391da177e4SLinus Torvalds if (!esp->auth.work_icv) 3401da177e4SLinus Torvalds goto error; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds esp->conf.key = x->ealg->alg_key; 3431da177e4SLinus Torvalds esp->conf.key_len = (x->ealg->alg_key_len+7)/8; 3441da177e4SLinus Torvalds if (x->props.ealgo == SADB_EALG_NULL) 3451da177e4SLinus Torvalds esp->conf.tfm = crypto_alloc_tfm(x->ealg->alg_name, CRYPTO_TFM_MODE_ECB); 3461da177e4SLinus Torvalds else 3471da177e4SLinus Torvalds esp->conf.tfm = crypto_alloc_tfm(x->ealg->alg_name, CRYPTO_TFM_MODE_CBC); 3481da177e4SLinus Torvalds if (esp->conf.tfm == NULL) 3491da177e4SLinus Torvalds goto error; 3501da177e4SLinus Torvalds esp->conf.ivlen = crypto_tfm_alg_ivsize(esp->conf.tfm); 3511da177e4SLinus Torvalds esp->conf.padlen = 0; 3521da177e4SLinus Torvalds if (esp->conf.ivlen) { 3531da177e4SLinus Torvalds esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL); 3541da177e4SLinus Torvalds if (unlikely(esp->conf.ivec == NULL)) 3551da177e4SLinus Torvalds goto error; 3561da177e4SLinus Torvalds get_random_bytes(esp->conf.ivec, esp->conf.ivlen); 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds if (crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len)) 3591da177e4SLinus Torvalds goto error; 3601da177e4SLinus Torvalds x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen; 3611da177e4SLinus Torvalds if (x->props.mode) 3621da177e4SLinus Torvalds x->props.header_len += sizeof(struct ipv6hdr); 3631da177e4SLinus Torvalds x->data = esp; 3641da177e4SLinus Torvalds return 0; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds error: 3671da177e4SLinus Torvalds x->data = esp; 3681da177e4SLinus Torvalds esp6_destroy(x); 3691da177e4SLinus Torvalds x->data = NULL; 3701da177e4SLinus Torvalds return -EINVAL; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds static struct xfrm_type esp6_type = 3741da177e4SLinus Torvalds { 3751da177e4SLinus Torvalds .description = "ESP6", 3761da177e4SLinus Torvalds .owner = THIS_MODULE, 3771da177e4SLinus Torvalds .proto = IPPROTO_ESP, 3781da177e4SLinus Torvalds .init_state = esp6_init_state, 3791da177e4SLinus Torvalds .destructor = esp6_destroy, 3801da177e4SLinus Torvalds .get_max_size = esp6_get_max_size, 3811da177e4SLinus Torvalds .input = esp6_input, 3821da177e4SLinus Torvalds .output = esp6_output 3831da177e4SLinus Torvalds }; 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds static struct inet6_protocol esp6_protocol = { 3861da177e4SLinus Torvalds .handler = xfrm6_rcv, 3871da177e4SLinus Torvalds .err_handler = esp6_err, 3881da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY, 3891da177e4SLinus Torvalds }; 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds static int __init esp6_init(void) 3921da177e4SLinus Torvalds { 3931da177e4SLinus Torvalds if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { 3941da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); 3951da177e4SLinus Torvalds return -EAGAIN; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { 3981da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); 3991da177e4SLinus Torvalds xfrm_unregister_type(&esp6_type, AF_INET6); 4001da177e4SLinus Torvalds return -EAGAIN; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds return 0; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds static void __exit esp6_fini(void) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) 4091da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); 4101da177e4SLinus Torvalds if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) 4111da177e4SLinus Torvalds printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds module_init(esp6_init); 4151da177e4SLinus Torvalds module_exit(esp6_fini); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 418