[PATCH net-next v2] ila: ipv6/ila: fix nlsize calculation for lwtunnel

[Nicolas Dichtel <nicolas.dichtel@6wind.com>]

From: Tom Herbert <tom@herbertland.com>

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

nla_total_size_64bit() must be use for ILA_ATTR_LOCATOR.

Also, do nla_put_u8 instead of nla_put_u64 for ILA_ATTR_CSUM_MODE.

Fixes: f13a82d87b21 ("ipv6: use nla_put_u64_64bit()")
Fixes: 90bfe662db13 ("ila: add checksum neutral ILA translations")
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---

Tom, I have taken the liberty of resending your patch, I hope it's ok
for you. Goal is to fix this before net-next closes.

v1 -> v2:
  update the patch after the merge of net (and thus update 'Fixes' tag)
  use nla_total_size_64bit() for ILA_ATTR_LOCATOR

 net/ipv6/ila/ila_lwt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index 17038e1ede98..1dfb64166d7d 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;
@@ -144,7 +144,9 @@ nla_put_failure:
 
 static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
-	return nla_total_size(sizeof(u64)); /* ILA_ATTR_LOCATOR */
+	return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
+	       nla_total_size(sizeof(u8)) +        /* ILA_ATTR_CSUM_MODE */
+	       0;
 }
 
 static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
-- 
2.8.1