1 files changed, 26 insertions, 26 deletions

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 363e63ffecca..7107bb7e2e62 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -42,21 +42,19 @@
 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;
+        u8 *tail;
+        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);
@@ -81,19 +79,20 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
         }
 
         /* Fill padding... */
+        tail = skb_tail_pointer(trailer);
         do {
                 int i;
                 for (i=0; i<clen-skb->len - 2; i++)
-                        *(u8*)(trailer->tail + i) = i+1;
+                        tail[i] = i + 1;
         } while (0);
-        *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
+        tail[clen-skb->len - 2] = (clen - skb->len) - 2;
         pskb_put(skb, trailer, clen - skb->len);
 
         top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
-        esph = (struct ipv6_esp_hdr *)skb->h.raw;
+        esph = (struct ipv6_esp_hdr *)skb_transport_header(skb);
         top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
-        *(u8*)(trailer->tail - 1) = *skb->nh.raw;
-        *skb->nh.raw = IPPROTO_ESP;
+        *(skb_tail_pointer(trailer) - 1) = *skb_network_header(skb);
+        *skb_network_header(skb) = IPPROTO_ESP;
 
         esph->spi = x->id.spi;
         esph->seq_no = htonl(++x->replay.oseq);
@@ -150,8 +149,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
         int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
         int alen = esp->auth.icv_trunc_len;
         int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;
-
-        int hdr_len = skb->h.raw - skb->nh.raw;
+        int hdr_len = skb_network_header_len(skb);
         int nfrags;
         int ret = 0;
 
@@ -191,7 +189,7 @@ 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)
@@ -231,28 +229,30 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
                 ret = nexthdr[1];
         }
 
-        skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - hdr_len;
-
+        __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
+        skb_set_transport_header(skb, -hdr_len);
 out:
         return ret;
 }
 
-static u32 esp6_get_max_size(struct xfrm_state *x, int mtu)
+static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
 {
         struct esp_data *esp = x->data;
         u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
+        u32 align = max_t(u32, blksize, esp->conf.padlen);
+        u32 rem;
+
+        mtu -= x->props.header_len + esp->auth.icv_trunc_len;
+        rem = mtu & (align - 1);
+        mtu &= ~(align - 1);
 
-        if (x->props.mode == XFRM_MODE_TUNNEL) {
-                mtu = ALIGN(mtu + 2, blksize);
-        } else {
-                /* The worst case. */
+        if (x->props.mode != XFRM_MODE_TUNNEL) {
                 u32 padsize = ((blksize - 1) & 7) + 1;
-                mtu = ALIGN(mtu + 2, padsize) + blksize - padsize;
+                mtu -= blksize - padsize;
+                mtu += min_t(u32, blksize - padsize, rem);
         }
-        if (esp->conf.padlen)
-                mtu = ALIGN(mtu, esp->conf.padlen);
 
-        return mtu + x->props.header_len + esp->auth.icv_trunc_len;
+        return mtu - 2;
 }
 
 static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
@@ -382,7 +382,7 @@ static struct xfrm_type esp6_type =
         .proto          = IPPROTO_ESP,
         .init_state     = esp6_init_state,
         .destructor     = esp6_destroy,
-        .get_max_size   = esp6_get_max_size,
+        .get_mtu        = esp6_get_mtu,
         .input          = esp6_input,
         .output         = esp6_output,
         .hdr_offset     = xfrm6_find_1stfragopt,