[SK_BUFF]: Introduce skb_transport_offset()

[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / esp6.c

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index e78680a9985b2cf86a1b6671c1a73a258973a57c..35905867ded161b46b88a67a0523de6c0daf0e7b 100644 (file)
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -1,26 +1,26 @@
 /*
  * Copyright (C)2002 USAGI/WIDE Project
- * 
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
- * 
+ *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * Authors
  *
- *     Mitsuru KANDA @USAGI       : IPv6 Support 
+ *     Mitsuru KANDA @USAGI       : IPv6 Support
  *     Kazunori MIYAZAWA @USAGI   :
  *     Kunihiro Ishiguro <kunihiro@ipinfusion.com>
- *     
+ *
  *     This file is derived from net/ipv4/esp.c
  */
 
@@ -42,21 +42,18 @@
 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 {
        int err;
-       int hdr_len;
        struct ipv6hdr *top_iph;
        struct ipv6_esp_hdr *esph;
        struct crypto_blkcipher *tfm;
        struct blkcipher_desc desc;
-       struct esp_data *esp;
        struct sk_buff *trailer;
        int blksize;
        int clen;
        int alen;
        int nfrags;
-
-       esp = x->data;
-       hdr_len = skb->h.raw - skb->data +
-                 sizeof(*esph) + esp->conf.ivlen;
+       struct esp_data *esp = x->data;
+       int hdr_len = (skb_transport_offset(skb) +
+                      sizeof(*esph) + esp->conf.ivlen);
 
        /* Strip IP+ESP header. */
        __skb_pull(skb, hdr_len);
@@ -92,8 +89,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
        top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
        esph = (struct ipv6_esp_hdr *)skb->h.raw;
        top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
-       *(u8*)(trailer->tail - 1) = *skb->nh.raw;
-       *skb->nh.raw = IPPROTO_ESP;
+       *(u8 *)(trailer->tail - 1) = *skb_network_header(skb);
+       *skb_network_header(skb) = IPPROTO_ESP;
 
        esph->spi = x->id.spi;
        esph->seq_no = htonl(++x->replay.oseq);
@@ -166,7 +163,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
        }
 
        /* If integrity check is required, do this. */
-        if (esp->auth.icv_full_len) {
+       if (esp->auth.icv_full_len) {
                u8 sum[alen];
 
                ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
@@ -191,13 +188,13 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
        skb->ip_summed = CHECKSUM_NONE;
 
        esph = (struct ipv6_esp_hdr*)skb->data;
-       iph = skb->nh.ipv6h;
+       iph = ipv6_hdr(skb);
 
        /* Get ivec. This can be wrong, check against another impls. */
        if (esp->conf.ivlen)
                crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
 
-        {
+       {
                u8 nexthdr[2];
                struct scatterlist *sg = &esp->sgbuf[0];
                u8 padlen;
@@ -225,7 +222,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
                        ret = -EINVAL;
                        goto out;
                }
-               /* ... check padding bits here. Silly. :-) */ 
+               /* ... check padding bits here. Silly. :-) */
 
                pskb_trim(skb, skb->len - alen - padlen - 2);
                ret = nexthdr[1];
@@ -256,20 +253,20 @@ static u32 esp6_get_max_size(struct xfrm_state *x, int mtu)
 }
 
 static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-                     int type, int code, int offset, __u32 info)
+                    int type, int code, int offset, __be32 info)
 {
        struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
        struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset);
        struct xfrm_state *x;
 
-       if (type != ICMPV6_DEST_UNREACH && 
+       if (type != ICMPV6_DEST_UNREACH &&
            type != ICMPV6_PKT_TOOBIG)
                return;
 
        x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
        if (!x)
                return;
-       printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n", 
+       printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n",
                        ntohl(esph->spi), NIP6(iph->daddr));
        xfrm_state_put(x);
 }
@@ -326,10 +323,10 @@ static int esp6_init_state(struct xfrm_state *x)
                esp->auth.tfm = hash;
                if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len))
                        goto error;
- 
+
                aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
                BUG_ON(!aalg_desc);
- 
+
                if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
                    crypto_hash_digestsize(hash)) {
                        NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
@@ -338,10 +335,10 @@ static int esp6_init_state(struct xfrm_state *x)
                                 aalg_desc->uinfo.auth.icv_fullbits/8);
                        goto error;
                }
- 
+
                esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
                esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
- 
+
                esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL);
                if (!esp->auth.work_icv)
                        goto error;