[PATCH] ipvs: Avoid unnecessary calls to skb_is_gso_sctp

[Ismael Luceno]

In the context of the SCTP SNAT/DNAT handler, these calls can only
return true.

Ref: e10d3ba4d434 ("ipvs: Fix checksumming on GSO of SCTP packets")
Signed-off-by: Ismael Luceno <iluceno@xxxxxxx>
CC: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
CC: Michal Kubeček <mkubecek@xxxxxxxx>
CC: Simon Horman <horms@xxxxxxxxxxxx>
CC: Julian Anastasov <ja@xxxxxx>
CC: lvs-devel@xxxxxxxxxxxxxxx
CC: netfilter-devel@xxxxxxxxxxxxxxx
CC: netdev@xxxxxxxxxxxxxxx
CC: coreteam@xxxxxxxxxxxxx
---
 net/netfilter/ipvs/ip_vs_proto_sctp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
index 1e689c714127..83e452916403 100644
--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
@@ -126,7 +126,7 @@ sctp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
 	if (sctph->source != cp->vport || payload_csum ||
 	    skb->ip_summed == CHECKSUM_PARTIAL) {
 		sctph->source = cp->vport;
-		if (!skb_is_gso(skb) || !skb_is_gso_sctp(skb))
+		if (!skb_is_gso(skb))
 			sctp_nat_csum(skb, sctph, sctphoff);
 	} else {
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -175,7 +175,7 @@ sctp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
 	    (skb->ip_summed == CHECKSUM_PARTIAL &&
 	     !(skb_dst(skb)->dev->features & NETIF_F_SCTP_CRC))) {
 		sctph->dest = cp->dport;
-		if (!skb_is_gso(skb) || !skb_is_gso_sctp(skb))
+		if (!skb_is_gso(skb))
 			sctp_nat_csum(skb, sctph, sctphoff);
 	} else if (skb->ip_summed != CHECKSUM_PARTIAL) {
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
-- 
2.44.0