netdev - [RFC ipsec-next 1/3] xfrm: move mark and oif flowi decode into common code

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Message-ID: <20230908120628.26164-2-fw@strlen.de>
Date: Fri,  8 Sep 2023 14:06:18 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au,
	Florian Westphal <fw@...len.de>
Subject: [RFC ipsec-next 1/3] xfrm: move mark and oif flowi decode into common code

flowi4_oif/flowi6_oif and mark are aliased to flowi_common field, i.e.
all can be used interchangeably.

Instead of duplicating place this in common code.

Signed-off-by: Florian Westphal <fw@...len.de>
---
 net/xfrm/xfrm_policy.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index d6b405782b63..5efdd20a4fb6 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3373,14 +3373,8 @@ decode_session4(struct sk_buff *skb, struct flowi *fl, bool reverse)
 	int ihl = iph->ihl;
 	u8 *xprth = skb_network_header(skb) + ihl * 4;
 	struct flowi4 *fl4 = &fl->u.ip4;
-	int oif = 0;
-
-	if (skb_dst(skb) && skb_dst(skb)->dev)
-		oif = skb_dst(skb)->dev->ifindex;
 
 	memset(fl4, 0, sizeof(struct flowi4));
-	fl4->flowi4_mark = skb->mark;
-	fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
 
 	fl4->flowi4_proto = iph->protocol;
 	fl4->daddr = reverse ? iph->saddr : iph->daddr;
@@ -3451,7 +3445,6 @@ decode_session6(struct sk_buff *skb, struct flowi *fl, bool reverse)
 	struct ipv6_opt_hdr *exthdr;
 	const unsigned char *nh = skb_network_header(skb);
 	u16 nhoff = IP6CB(skb)->nhoff;
-	int oif = 0;
 	u8 nexthdr;
 
 	if (!nhoff)
@@ -3459,12 +3452,7 @@ decode_session6(struct sk_buff *skb, struct flowi *fl, bool reverse)
 
 	nexthdr = nh[nhoff];
 
-	if (skb_dst(skb) && skb_dst(skb)->dev)
-		oif = skb_dst(skb)->dev->ifindex;
-
 	memset(fl6, 0, sizeof(struct flowi6));
-	fl6->flowi6_mark = skb->mark;
-	fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
 
 	fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
 	fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
@@ -3570,6 +3558,18 @@ int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
 		return -EAFNOSUPPORT;
 	}
 
+	fl->flowi_mark = skb->mark;
+	if (reverse) {
+		fl->flowi_oif = skb->skb_iif;
+	} else {
+		int oif = 0;
+
+		if (skb_dst(skb) && skb_dst(skb)->dev)
+			oif = skb_dst(skb)->dev->ifindex;
+
+		fl->flowi_oif = oif;
+	}
+
 	return security_xfrm_decode_session(skb, &fl->flowi_secid);
 }
 EXPORT_SYMBOL(__xfrm_decode_session);
-- 
2.41.0