forked from luck/tmp_suning_uos_patched
ea2c47b42f
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
425 lines
10 KiB
C
425 lines
10 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#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 <asm/scatterlist.h>
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#include <linux/crypto.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/spinlock.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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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_blkcipher *tfm;
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struct blkcipher_desc desc;
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struct sk_buff *trailer;
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int blksize;
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int clen;
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int alen;
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int nfrags;
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u8 *tail;
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struct esp_data *esp = x->data;
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/* skb is pure payload to encrypt */
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err = -ENOMEM;
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/* Round to block size */
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clen = skb->len;
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alen = esp->auth.icv_trunc_len;
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tfm = esp->conf.tfm;
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desc.tfm = tfm;
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desc.flags = 0;
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blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
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clen = ALIGN(clen + 2, blksize);
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if (esp->conf.padlen)
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clen = ALIGN(clen, esp->conf.padlen);
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if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
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goto error;
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}
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/* Fill padding... */
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tail = skb_tail_pointer(trailer);
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do {
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int i;
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for (i=0; i<clen-skb->len - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[clen-skb->len - 2] = (clen - skb->len) - 2;
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pskb_put(skb, trailer, clen - skb->len);
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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_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
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*skb_mac_header(skb) = IPPROTO_ESP;
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esph->spi = x->id.spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
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spin_lock_bh(&x->lock);
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if (esp->conf.ivlen) {
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if (unlikely(!esp->conf.ivinitted)) {
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get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
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esp->conf.ivinitted = 1;
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}
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crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
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}
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do {
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struct scatterlist *sg = &esp->sgbuf[0];
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if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
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sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
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if (!sg)
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goto unlock;
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}
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skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
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err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
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if (unlikely(sg != &esp->sgbuf[0]))
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kfree(sg);
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} while (0);
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if (unlikely(err))
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goto unlock;
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if (esp->conf.ivlen) {
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memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
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crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
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}
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if (esp->auth.icv_full_len) {
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err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
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sizeof(*esph) + esp->conf.ivlen + clen);
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memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
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}
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unlock:
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spin_unlock_bh(&x->lock);
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error:
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return 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 ipv6hdr *iph;
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struct ip_esp_hdr *esph;
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struct esp_data *esp = x->data;
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struct crypto_blkcipher *tfm = esp->conf.tfm;
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struct blkcipher_desc desc = { .tfm = tfm };
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struct sk_buff *trailer;
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int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
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int alen = esp->auth.icv_trunc_len;
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int elen = skb->len - sizeof(*esph) - esp->conf.ivlen - alen;
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int hdr_len = skb_network_header_len(skb);
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int nfrags;
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int ret = 0;
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if (!pskb_may_pull(skb, sizeof(*esph))) {
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ret = -EINVAL;
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goto out;
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}
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if (elen <= 0 || (elen & (blksize-1))) {
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ret = -EINVAL;
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goto out;
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}
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/* If integrity check is required, do this. */
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if (esp->auth.icv_full_len) {
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u8 sum[alen];
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ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
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if (ret)
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goto out;
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if (skb_copy_bits(skb, skb->len - alen, sum, alen))
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BUG();
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if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
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x->stats.integrity_failed++;
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ret = -EINVAL;
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goto out;
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}
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}
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if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
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ret = -EINVAL;
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goto out;
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}
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skb->ip_summed = CHECKSUM_NONE;
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esph = (struct ip_esp_hdr *)skb->data;
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iph = ipv6_hdr(skb);
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/* Get ivec. This can be wrong, check against another impls. */
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if (esp->conf.ivlen)
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crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
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{
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u8 nexthdr[2];
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struct scatterlist *sg = &esp->sgbuf[0];
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u8 padlen;
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if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
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sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
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if (!sg) {
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ret = -ENOMEM;
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goto out;
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}
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}
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skb_to_sgvec(skb, sg, sizeof(*esph) + esp->conf.ivlen, elen);
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ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
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if (unlikely(sg != &esp->sgbuf[0]))
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kfree(sg);
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if (unlikely(ret))
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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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padlen = nexthdr[0];
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if (padlen+2 >= elen) {
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LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
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ret = -EINVAL;
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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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ret = nexthdr[1];
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}
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__skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
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skb_set_transport_header(skb, -hdr_len);
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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 esp_data *esp = x->data;
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u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
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u32 align = max_t(u32, blksize, esp->conf.padlen);
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u32 rem;
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mtu -= x->props.header_len + esp->auth.icv_trunc_len;
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rem = mtu & (align - 1);
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mtu &= ~(align - 1);
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if (x->props.mode != XFRM_MODE_TUNNEL) {
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u32 padsize = ((blksize - 1) & 7) + 1;
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mtu -= blksize - padsize;
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mtu += min_t(u32, blksize - padsize, rem);
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}
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return mtu - 2;
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}
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static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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int type, int code, int offset, __be32 info)
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{
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struct ipv6hdr *iph = (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_DEST_UNREACH &&
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type != ICMPV6_PKT_TOOBIG)
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return;
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x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
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if (!x)
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return;
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printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n",
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ntohl(esph->spi), NIP6(iph->daddr));
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xfrm_state_put(x);
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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 esp_data *esp = x->data;
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if (!esp)
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return;
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crypto_free_blkcipher(esp->conf.tfm);
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esp->conf.tfm = NULL;
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kfree(esp->conf.ivec);
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esp->conf.ivec = NULL;
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crypto_free_hash(esp->auth.tfm);
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esp->auth.tfm = NULL;
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kfree(esp->auth.work_icv);
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esp->auth.work_icv = NULL;
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kfree(esp);
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}
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static int esp6_init_state(struct xfrm_state *x)
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{
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struct esp_data *esp = NULL;
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struct crypto_blkcipher *tfm;
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if (x->ealg == NULL)
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goto error;
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if (x->encap)
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goto error;
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esp = kzalloc(sizeof(*esp), GFP_KERNEL);
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if (esp == NULL)
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return -ENOMEM;
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if (x->aalg) {
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struct xfrm_algo_desc *aalg_desc;
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struct crypto_hash *hash;
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hash = crypto_alloc_hash(x->aalg->alg_name, 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(hash))
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goto error;
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esp->auth.tfm = hash;
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if (crypto_hash_setkey(hash, x->aalg->alg_key,
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(x->aalg->alg_key_len + 7) / 8))
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goto error;
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aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
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BUG_ON(!aalg_desc);
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if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
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crypto_hash_digestsize(hash)) {
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NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
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x->aalg->alg_name,
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crypto_hash_digestsize(hash),
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aalg_desc->uinfo.auth.icv_fullbits/8);
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goto error;
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}
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esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
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esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
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esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL);
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if (!esp->auth.work_icv)
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goto error;
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}
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tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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goto error;
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esp->conf.tfm = tfm;
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esp->conf.ivlen = crypto_blkcipher_ivsize(tfm);
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esp->conf.padlen = 0;
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if (esp->conf.ivlen) {
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esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
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if (unlikely(esp->conf.ivec == NULL))
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goto error;
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esp->conf.ivinitted = 0;
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}
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if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key,
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(x->ealg->alg_key_len + 7) / 8))
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goto error;
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x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
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switch (x->props.mode) {
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case XFRM_MODE_BEET:
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case XFRM_MODE_TRANSPORT:
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break;
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case XFRM_MODE_TUNNEL:
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x->props.header_len += sizeof(struct ipv6hdr);
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break;
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default:
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goto error;
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}
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x->data = esp;
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return 0;
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error:
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x->data = esp;
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esp6_destroy(x);
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x->data = NULL;
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return -EINVAL;
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}
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static struct xfrm_type esp6_type =
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{
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.description = "ESP6",
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.owner = THIS_MODULE,
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.proto = IPPROTO_ESP,
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.flags = XFRM_TYPE_REPLAY_PROT,
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.init_state = esp6_init_state,
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.destructor = esp6_destroy,
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.get_mtu = esp6_get_mtu,
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.input = esp6_input,
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.output = esp6_output,
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.hdr_offset = xfrm6_find_1stfragopt,
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};
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static struct inet6_protocol esp6_protocol = {
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.handler = xfrm6_rcv,
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.err_handler = esp6_err,
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.flags = INET6_PROTO_NOPOLICY,
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};
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static int __init esp6_init(void)
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{
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if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
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printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n");
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return -EAGAIN;
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}
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if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) {
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printk(KERN_INFO "ipv6 esp init: can't add protocol\n");
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xfrm_unregister_type(&esp6_type, AF_INET6);
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return -EAGAIN;
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}
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return 0;
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}
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static void __exit esp6_fini(void)
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{
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if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0)
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printk(KERN_INFO "ipv6 esp close: can't remove protocol\n");
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if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
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printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n");
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}
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module_init(esp6_init);
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module_exit(esp6_fini);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
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