[XFRM]: Add XFRM_MODE_xxx for future use.

Transformation mode is used as either IPsec transport or tunnel.
It is required to add two more items, route optimization and inbound trigger
for Mobile IPv6.
Based on MIPL2 kernel patch.

This patch was also written by: Ville Nuorvala <vnuorval@tcs.hut.fi>

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index b428489f6ccd..e87377e1d6b6 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -248,7 +248,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
                  *    as per draft-ietf-ipsec-udp-encaps-06,
                  *    section 3.1.2
                  */
-                if (!x->props.mode)
+                if (x->props.mode == XFRM_MODE_TRANSPORT)
                         skb->ip_summed = CHECKSUM_UNNECESSARY;
         }
 
@@ -267,7 +267,7 @@ static u32 esp4_get_max_size(struct xfrm_state *x, int mtu)
         struct esp_data *esp = x->data;
         u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
 
-        if (x->props.mode) {
+        if (x->props.mode == XFRM_MODE_TUNNEL) {
                 mtu = ALIGN(mtu + 2, blksize);
         } else {
                 /* The worst case. */
@@ -383,7 +383,7 @@ static int esp_init_state(struct xfrm_state *x)
         if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
                 goto error;
         x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
-        if (x->props.mode)
+        if (x->props.mode == XFRM_MODE_TUNNEL)
                 x->props.header_len += sizeof(struct iphdr);
         if (x->encap) {
                 struct xfrm_encap_tmpl *encap = x->encap;