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000ae7b269
This patch makes use of the new AEAD interface which uses a single SG list instead of separate lists for the AD and plain text. The IV generation is also now carried out through normal AEAD methods. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
717 lines
16 KiB
C
717 lines
16 KiB
C
/*
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* Copyright (C)2002 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors
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*
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* Mitsuru KANDA @USAGI : IPv6 Support
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* Kazunori MIYAZAWA @USAGI :
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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*
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* This file is derived from net/ipv4/esp.c
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*/
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#define pr_fmt(fmt) "IPv6: " fmt
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#include <crypto/aead.h>
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#include <crypto/authenc.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/esp.h>
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#include <linux/scatterlist.h>
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#include <linux/kernel.h>
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#include <linux/pfkeyv2.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <net/ip6_route.h>
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#include <net/icmp.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <linux/icmpv6.h>
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struct esp_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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};
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#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
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static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
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/*
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* Allocate an AEAD request structure with extra space for SG and IV.
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*
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* For alignment considerations the upper 32 bits of the sequence number are
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* placed at the front, if present. Followed by the IV, the request and finally
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* the SG list.
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*
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* TODO: Use spare space in skb for this where possible.
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*/
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static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
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{
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unsigned int len;
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len = seqihlen;
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len += crypto_aead_ivsize(aead);
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if (len) {
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len += crypto_aead_alignmask(aead) &
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~(crypto_tfm_ctx_alignment() - 1);
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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}
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len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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return kmalloc(len, GFP_ATOMIC);
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}
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static inline __be32 *esp_tmp_seqhi(void *tmp)
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{
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return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
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}
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static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
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{
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return crypto_aead_ivsize(aead) ?
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PTR_ALIGN((u8 *)tmp + seqhilen,
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crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
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}
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static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
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{
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struct aead_request *req;
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req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
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crypto_tfm_ctx_alignment());
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aead_request_set_tfm(req, aead);
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return req;
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}
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static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
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struct aead_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_aead_reqsize(aead),
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__alignof__(struct scatterlist));
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}
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static void esp_output_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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kfree(ESP_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb, err);
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}
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/* Move ESP header back into place. */
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static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
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{
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struct ip_esp_hdr *esph = (void *)(skb->data + offset);
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void *tmp = ESP_SKB_CB(skb)->tmp;
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__be32 *seqhi = esp_tmp_seqhi(tmp);
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esph->seq_no = esph->spi;
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esph->spi = *seqhi;
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}
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static void esp_output_restore_header(struct sk_buff *skb)
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{
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esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
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}
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static void esp_output_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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esp_output_restore_header(skb);
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esp_output_done(base, err);
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}
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static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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struct ip_esp_hdr *esph;
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struct crypto_aead *aead;
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struct aead_request *req;
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struct scatterlist *sg;
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struct sk_buff *trailer;
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void *tmp;
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int blksize;
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int clen;
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int alen;
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int plen;
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int ivlen;
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int tfclen;
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int nfrags;
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int assoclen;
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int seqhilen;
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u8 *iv;
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u8 *tail;
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__be32 *seqhi;
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__be64 seqno;
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/* skb is pure payload to encrypt */
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aead = x->data;
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alen = crypto_aead_authsize(aead);
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ivlen = crypto_aead_ivsize(aead);
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tfclen = 0;
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if (x->tfcpad) {
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struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
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u32 padto;
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padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
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if (skb->len < padto)
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tfclen = padto - skb->len;
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}
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blksize = ALIGN(crypto_aead_blocksize(aead), 4);
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clen = ALIGN(skb->len + 2 + tfclen, blksize);
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plen = clen - skb->len - tfclen;
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err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
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if (err < 0)
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goto error;
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nfrags = err;
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assoclen = sizeof(*esph);
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seqhilen = 0;
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if (x->props.flags & XFRM_STATE_ESN) {
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seqhilen += sizeof(__be32);
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assoclen += seqhilen;
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}
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp) {
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err = -ENOMEM;
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goto error;
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}
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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/* Fill padding... */
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tail = skb_tail_pointer(trailer);
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if (tfclen) {
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memset(tail, 0, tfclen);
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tail += tfclen;
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}
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do {
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int i;
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for (i = 0; i < plen - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[plen - 2] = plen - 2;
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tail[plen - 1] = *skb_mac_header(skb);
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pskb_put(skb, trailer, clen - skb->len + alen);
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skb_push(skb, -skb_network_offset(skb));
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esph = ip_esp_hdr(skb);
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*skb_mac_header(skb) = IPPROTO_ESP;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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aead_request_set_callback(req, 0, esp_output_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* encryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
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*seqhi = esph->spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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aead_request_set_callback(req, 0, esp_output_done_esn, skb);
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}
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esph->spi = x->id.spi;
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg,
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(unsigned char *)esph - skb->data,
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assoclen + ivlen + clen + alen);
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aead_request_set_crypt(req, sg, sg, ivlen + clen, iv);
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aead_request_set_ad(req, assoclen);
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seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
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((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
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memset(iv, 0, ivlen);
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memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&seqno + 8 - min(ivlen, 8),
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min(ivlen, 8));
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ESP_SKB_CB(skb)->tmp = tmp;
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err = crypto_aead_encrypt(req);
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switch (err) {
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case -EINPROGRESS:
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goto error;
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case -EBUSY:
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err = NET_XMIT_DROP;
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break;
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case 0:
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if ((x->props.flags & XFRM_STATE_ESN))
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esp_output_restore_header(skb);
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}
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kfree(tmp);
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error:
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return err;
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}
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static int esp_input_done2(struct sk_buff *skb, int err)
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{
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struct xfrm_state *x = xfrm_input_state(skb);
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struct crypto_aead *aead = x->data;
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int alen = crypto_aead_authsize(aead);
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int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
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int elen = skb->len - hlen;
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int hdr_len = skb_network_header_len(skb);
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int padlen;
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u8 nexthdr[2];
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kfree(ESP_SKB_CB(skb)->tmp);
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if (unlikely(err))
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goto out;
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if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
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BUG();
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err = -EINVAL;
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padlen = nexthdr[0];
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if (padlen + 2 + alen >= elen) {
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net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
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padlen + 2, elen - alen);
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goto out;
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}
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/* ... check padding bits here. Silly. :-) */
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pskb_trim(skb, skb->len - alen - padlen - 2);
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__skb_pull(skb, hlen);
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if (x->props.mode == XFRM_MODE_TUNNEL)
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skb_reset_transport_header(skb);
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else
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skb_set_transport_header(skb, -hdr_len);
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err = nexthdr[1];
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/* RFC4303: Drop dummy packets without any error */
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if (err == IPPROTO_NONE)
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err = -EINVAL;
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out:
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return err;
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}
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static void esp_input_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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xfrm_input_resume(skb, esp_input_done2(skb, err));
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}
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static void esp_input_restore_header(struct sk_buff *skb)
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{
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esp_restore_header(skb, 0);
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__skb_pull(skb, 4);
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}
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static void esp_input_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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esp_input_restore_header(skb);
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esp_input_done(base, err);
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}
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static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ip_esp_hdr *esph;
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struct crypto_aead *aead = x->data;
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struct aead_request *req;
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struct sk_buff *trailer;
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int ivlen = crypto_aead_ivsize(aead);
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int elen = skb->len - sizeof(*esph) - ivlen;
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int nfrags;
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int assoclen;
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int seqhilen;
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int ret = 0;
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void *tmp;
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__be32 *seqhi;
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u8 *iv;
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struct scatterlist *sg;
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if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) {
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ret = -EINVAL;
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goto out;
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}
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if (elen <= 0) {
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ret = -EINVAL;
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goto out;
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}
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nfrags = skb_cow_data(skb, 0, &trailer);
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if (nfrags < 0) {
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ret = -EINVAL;
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goto out;
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}
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ret = -ENOMEM;
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assoclen = sizeof(*esph);
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seqhilen = 0;
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if (x->props.flags & XFRM_STATE_ESN) {
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seqhilen += sizeof(__be32);
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assoclen += seqhilen;
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}
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp)
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goto out;
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ESP_SKB_CB(skb)->tmp = tmp;
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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skb->ip_summed = CHECKSUM_NONE;
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esph = (struct ip_esp_hdr *)skb->data;
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aead_request_set_callback(req, 0, esp_input_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* decryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)skb_push(skb, 4);
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*seqhi = esph->spi;
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esph->spi = esph->seq_no;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.input.hi);
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aead_request_set_callback(req, 0, esp_input_done_esn, skb);
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}
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, 0, skb->len);
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aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
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aead_request_set_ad(req, assoclen);
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ret = crypto_aead_decrypt(req);
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if (ret == -EINPROGRESS)
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goto out;
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if ((x->props.flags & XFRM_STATE_ESN))
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esp_input_restore_header(skb);
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ret = esp_input_done2(skb, ret);
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out:
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return ret;
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}
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static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
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{
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struct crypto_aead *aead = x->data;
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u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
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unsigned int net_adj;
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if (x->props.mode != XFRM_MODE_TUNNEL)
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net_adj = sizeof(struct ipv6hdr);
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else
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net_adj = 0;
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return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
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net_adj) & ~(blksize - 1)) + net_adj - 2;
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}
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static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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struct net *net = dev_net(skb->dev);
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const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
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struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
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struct xfrm_state *x;
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if (type != ICMPV6_PKT_TOOBIG &&
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type != NDISC_REDIRECT)
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return 0;
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x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
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esph->spi, IPPROTO_ESP, AF_INET6);
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if (!x)
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return 0;
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if (type == NDISC_REDIRECT)
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ip6_redirect(skb, net, skb->dev->ifindex, 0);
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else
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ip6_update_pmtu(skb, net, info, 0, 0);
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xfrm_state_put(x);
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return 0;
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}
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static void esp6_destroy(struct xfrm_state *x)
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{
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struct crypto_aead *aead = x->data;
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if (!aead)
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return;
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crypto_free_aead(aead);
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}
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static int esp_init_aead(struct xfrm_state *x)
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{
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char aead_name[CRYPTO_MAX_ALG_NAME];
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struct crypto_aead *aead;
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int err;
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err = -ENAMETOOLONG;
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if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
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x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
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|
goto error;
|
|
|
|
aead = crypto_alloc_aead(aead_name, 0, 0);
|
|
err = PTR_ERR(aead);
|
|
if (IS_ERR(aead))
|
|
goto error;
|
|
|
|
x->data = aead;
|
|
|
|
err = crypto_aead_setkey(aead, x->aead->alg_key,
|
|
(x->aead->alg_key_len + 7) / 8);
|
|
if (err)
|
|
goto error;
|
|
|
|
err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
|
|
if (err)
|
|
goto error;
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static int esp_init_authenc(struct xfrm_state *x)
|
|
{
|
|
struct crypto_aead *aead;
|
|
struct crypto_authenc_key_param *param;
|
|
struct rtattr *rta;
|
|
char *key;
|
|
char *p;
|
|
char authenc_name[CRYPTO_MAX_ALG_NAME];
|
|
unsigned int keylen;
|
|
int err;
|
|
|
|
err = -EINVAL;
|
|
if (!x->ealg)
|
|
goto error;
|
|
|
|
err = -ENAMETOOLONG;
|
|
|
|
if ((x->props.flags & XFRM_STATE_ESN)) {
|
|
if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s%sauthencesn(%s,%s)%s",
|
|
x->geniv ?: "", x->geniv ? "(" : "",
|
|
x->aalg ? x->aalg->alg_name : "digest_null",
|
|
x->ealg->alg_name,
|
|
x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
|
|
goto error;
|
|
} else {
|
|
if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s%sauthenc(%s,%s)%s",
|
|
x->geniv ?: "", x->geniv ? "(" : "",
|
|
x->aalg ? x->aalg->alg_name : "digest_null",
|
|
x->ealg->alg_name,
|
|
x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
|
|
goto error;
|
|
}
|
|
|
|
aead = crypto_alloc_aead(authenc_name, 0, 0);
|
|
err = PTR_ERR(aead);
|
|
if (IS_ERR(aead))
|
|
goto error;
|
|
|
|
x->data = aead;
|
|
|
|
keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
|
|
(x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
|
|
err = -ENOMEM;
|
|
key = kmalloc(keylen, GFP_KERNEL);
|
|
if (!key)
|
|
goto error;
|
|
|
|
p = key;
|
|
rta = (void *)p;
|
|
rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
|
|
rta->rta_len = RTA_LENGTH(sizeof(*param));
|
|
param = RTA_DATA(rta);
|
|
p += RTA_SPACE(sizeof(*param));
|
|
|
|
if (x->aalg) {
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
|
|
memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
|
|
p += (x->aalg->alg_key_len + 7) / 8;
|
|
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
BUG_ON(!aalg_desc);
|
|
|
|
err = -EINVAL;
|
|
if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
|
|
crypto_aead_authsize(aead)) {
|
|
pr_info("ESP: %s digestsize %u != %hu\n",
|
|
x->aalg->alg_name,
|
|
crypto_aead_authsize(aead),
|
|
aalg_desc->uinfo.auth.icv_fullbits / 8);
|
|
goto free_key;
|
|
}
|
|
|
|
err = crypto_aead_setauthsize(
|
|
aead, x->aalg->alg_trunc_len / 8);
|
|
if (err)
|
|
goto free_key;
|
|
}
|
|
|
|
param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
|
|
memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
|
|
|
|
err = crypto_aead_setkey(aead, key, keylen);
|
|
|
|
free_key:
|
|
kfree(key);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static int esp6_init_state(struct xfrm_state *x)
|
|
{
|
|
struct crypto_aead *aead;
|
|
u32 align;
|
|
int err;
|
|
|
|
if (x->encap)
|
|
return -EINVAL;
|
|
|
|
x->data = NULL;
|
|
|
|
if (x->aead)
|
|
err = esp_init_aead(x);
|
|
else
|
|
err = esp_init_authenc(x);
|
|
|
|
if (err)
|
|
goto error;
|
|
|
|
aead = x->data;
|
|
|
|
x->props.header_len = sizeof(struct ip_esp_hdr) +
|
|
crypto_aead_ivsize(aead);
|
|
switch (x->props.mode) {
|
|
case XFRM_MODE_BEET:
|
|
if (x->sel.family != AF_INET6)
|
|
x->props.header_len += IPV4_BEET_PHMAXLEN +
|
|
(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
|
|
break;
|
|
case XFRM_MODE_TRANSPORT:
|
|
break;
|
|
case XFRM_MODE_TUNNEL:
|
|
x->props.header_len += sizeof(struct ipv6hdr);
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
|
|
align = ALIGN(crypto_aead_blocksize(aead), 4);
|
|
x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static int esp6_rcv_cb(struct sk_buff *skb, int err)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct xfrm_type esp6_type = {
|
|
.description = "ESP6",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_ESP,
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
|
.init_state = esp6_init_state,
|
|
.destructor = esp6_destroy,
|
|
.get_mtu = esp6_get_mtu,
|
|
.input = esp6_input,
|
|
.output = esp6_output,
|
|
.hdr_offset = xfrm6_find_1stfragopt,
|
|
};
|
|
|
|
static struct xfrm6_protocol esp6_protocol = {
|
|
.handler = xfrm6_rcv,
|
|
.cb_handler = esp6_rcv_cb,
|
|
.err_handler = esp6_err,
|
|
.priority = 0,
|
|
};
|
|
|
|
static int __init esp6_init(void)
|
|
{
|
|
if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
|
|
pr_info("%s: can't add xfrm type\n", __func__);
|
|
return -EAGAIN;
|
|
}
|
|
if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
|
|
pr_info("%s: can't add protocol\n", __func__);
|
|
xfrm_unregister_type(&esp6_type, AF_INET6);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit esp6_fini(void)
|
|
{
|
|
if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
|
|
pr_info("%s: can't remove protocol\n", __func__);
|
|
if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
|
|
pr_info("%s: can't remove xfrm type\n", __func__);
|
|
}
|
|
|
|
module_init(esp6_init);
|
|
module_exit(esp6_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
|