netdev - [PATCHv2 net-next 4/7] sctp: add skb_sdif in struct sctp

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Message-Id: <219e9965f3f8d3f41a8c448a3d0ef19b8dc2bc57.1668628394.git.lucien.xin@gmail.com>
Date:   Wed, 16 Nov 2022 15:01:19 -0500
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        David Ahern <dsahern@...il.com>,
        Carlo Carraro <colrack@...il.com>
Subject: [PATCHv2 net-next 4/7] sctp: add skb_sdif in struct sctp_af

Add skb_sdif function in struct sctp_af to get the enslaved device
for both ipv4 and ipv6 when adding SCTP VRF support in sctp_rcv in
the next patch.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/net/sctp/structs.h | 1 +
 net/sctp/ipv6.c            | 8 +++++++-
 net/sctp/protocol.c        | 6 ++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 350f250b0dc7..7b4884c63b26 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -477,6 +477,7 @@ struct sctp_af {
 	int		(*available)	(union sctp_addr *,
 					 struct sctp_sock *);
 	int		(*skb_iif)	(const struct sk_buff *sk);
+	int		(*skb_sdif)(const struct sk_buff *sk);
 	int		(*is_ce)	(const struct sk_buff *sk);
 	void		(*seq_dump_addr)(struct seq_file *seq,
 					 union sctp_addr *addr);
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index e6274cdbdf6c..097bd60ce964 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -842,7 +842,12 @@ static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
 /* Where did this skb come from?  */
 static int sctp_v6_skb_iif(const struct sk_buff *skb)
 {
-	return IP6CB(skb)->iif;
+	return inet6_iif(skb);
+}
+
+static int sctp_v6_skb_sdif(const struct sk_buff *skb)
+{
+	return inet6_sdif(skb);
 }
 
 /* Was this packet marked by Explicit Congestion Notification? */
@@ -1142,6 +1147,7 @@ static struct sctp_af sctp_af_inet6 = {
 	.is_any		   = sctp_v6_is_any,
 	.available	   = sctp_v6_available,
 	.skb_iif	   = sctp_v6_skb_iif,
+	.skb_sdif	   = sctp_v6_skb_sdif,
 	.is_ce		   = sctp_v6_is_ce,
 	.seq_dump_addr	   = sctp_v6_seq_dump_addr,
 	.ecn_capable	   = sctp_v6_ecn_capable,
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index dbfe7d1000c2..a18cf0471a8d 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -567,6 +567,11 @@ static int sctp_v4_skb_iif(const struct sk_buff *skb)
 	return inet_iif(skb);
 }
 
+static int sctp_v4_skb_sdif(const struct sk_buff *skb)
+{
+	return inet_sdif(skb);
+}
+
 /* Was this packet marked by Explicit Congestion Notification? */
 static int sctp_v4_is_ce(const struct sk_buff *skb)
 {
@@ -1185,6 +1190,7 @@ static struct sctp_af sctp_af_inet = {
 	.available	   = sctp_v4_available,
 	.scope		   = sctp_v4_scope,
 	.skb_iif	   = sctp_v4_skb_iif,
+	.skb_sdif	   = sctp_v4_skb_sdif,
 	.is_ce		   = sctp_v4_is_ce,
 	.seq_dump_addr	   = sctp_v4_seq_dump_addr,
 	.ecn_capable	   = sctp_v4_ecn_capable,
-- 
2.31.1