[PATCH net-next] ila: ipv6/ila: fix nlsize calculation for lwtunnel

[Tom Herbert <tom@herbertland.com>]

The handler 'ila_fill_encap_info' adds two attributes: ILA_ATTR_LOCATOR
and ILA_ATTR_CSUM_MODE.

Also, do nla_put_u8 instead of nla_put_u64 for ILA_ATTR_CSUM_MODE.

Fixes: 65d7ab8de582 ("net: Identifier Locator Addressing module")
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Tom Herbert <tom@herbertland.com>
---
 net/ipv6/ila/ila_lwt.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index 4985e1a..7788090 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -133,7 +133,7 @@ static int ila_fill_encap_info(struct sk_buff *skb,
 	if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
 			      ILA_ATTR_PAD))
 		goto nla_put_failure;
-	if (nla_put_u64(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
+	if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
 		goto nla_put_failure;
 
 	return 0;
@@ -144,8 +144,12 @@ nla_put_failure:
 
 static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
-	/* No encapsulation overhead */
-	return 0;
+	return
+		/* ILA_ATTR_LOCATOR */
+		nla_total_size(sizeof(u64)) +
+		/* ILA_ATTR_CSUM_MODE */
+		nla_total_size(sizeof(u8)) +
+		0;
 }
 
 static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
-- 
2.8.0.rc2