From 28e450333d4d1328710e258d38793c61658d4c95 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Wed, 17 Oct 2018 08:53:12 +0000 Subject: [PATCH] inet: Refactor INET_ECN_decapsulate() Drivers that support tunnel decapsulation (IPinIP or NVE) need to configure the underlying device to conform to the behavior outlined in RFC 6040 with respect to the ECN bits. This behavior is implemented by INET_ECN_decapsulate() which requires an skb to be passed where the ECN CE bit can be potentially set. Since these drivers do not need to mark an skb, but only configure the device to do so, factor out the business logic to __INET_ECN_decapsulate() and potentially perform the marking in INET_ECN_decapsulate(). This allows drivers to invoke __INET_ECN_decapsulate() and configure the device. Signed-off-by: Ido Schimmel Suggested-by: Petr Machata Reviewed-by: Petr Machata Signed-off-by: David S. Miller --- include/net/inet_ecn.h | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h index 482a1b705362..c8e2bebd8d93 100644 --- a/include/net/inet_ecn.h +++ b/include/net/inet_ecn.h @@ -183,8 +183,7 @@ static inline int INET_ECN_set_ce(struct sk_buff *skb) * 1 if something is broken and should be logged (!!! above) * 2 if packet should be dropped */ -static inline int INET_ECN_decapsulate(struct sk_buff *skb, - __u8 outer, __u8 inner) +static inline int __INET_ECN_decapsulate(__u8 outer, __u8 inner, bool *set_ce) { if (INET_ECN_is_not_ect(inner)) { switch (outer & INET_ECN_MASK) { @@ -198,10 +197,21 @@ static inline int INET_ECN_decapsulate(struct sk_buff *skb, } } - if (INET_ECN_is_ce(outer)) + *set_ce = INET_ECN_is_ce(outer); + return 0; +} + +static inline int INET_ECN_decapsulate(struct sk_buff *skb, + __u8 outer, __u8 inner) +{ + bool set_ce = false; + int rc; + + rc = __INET_ECN_decapsulate(outer, inner, &set_ce); + if (!rc && set_ce) INET_ECN_set_ce(skb); - return 0; + return rc; } static inline int IP_ECN_decapsulate(const struct iphdr *oiph,