netdev - [PATCH 6.1 1/3] inet6: Remove inet6_destroy_sock() in sk->sk

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Message-ID: <856e7c2bf3b60fca1274aeba9eeb7bf4c626c312.1681954729.git.william.xuanziyang@huawei.com>
Date:   Thu, 20 Apr 2023 12:39:47 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <gregkh@...uxfoundation.org>, <stable@...r.kernel.org>,
        <davem@...emloft.net>, <kuznet@....inr.ac.ru>,
        <yoshfuji@...ux-ipv6.org>, <dsahern@...nel.org>, <kuba@...nel.org>,
        <kuniyu@...zon.com>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH 6.1 1/3] inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy().

From: Kuniyuki Iwashima <kuniyu@...zon.com>

commit b5fc29233d28be7a3322848ebe73ac327559cdb9 upstream.

After commit d38afeec26ed ("tcp/udp: Call inet6_destroy_sock()
in IPv6 sk->sk_destruct()."), we call inet6_destroy_sock() in
sk->sk_destruct() by setting inet6_sock_destruct() to it to make
sure we do not leak inet6-specific resources.

Now we can remove unnecessary inet6_destroy_sock() calls in
sk->sk_prot->destroy().

DCCP and SCTP have their own sk->sk_destruct() function, so we
change them separately in the following patches.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 net/ipv6/ping.c      | 6 ------
 net/ipv6/raw.c       | 2 --
 net/ipv6/tcp_ipv6.c  | 8 +-------
 net/ipv6/udp.c       | 2 --
 net/l2tp/l2tp_ip6.c  | 2 --
 net/mptcp/protocol.c | 7 -------
 6 files changed, 1 insertion(+), 26 deletions(-)

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index 86c26e48d065..808983bc2ec9 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -23,11 +23,6 @@
 #include <linux/bpf-cgroup.h>
 #include <net/ping.h>
 
-static void ping_v6_destroy(struct sock *sk)
-{
-	inet6_destroy_sock(sk);
-}
-
 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 				 int *addr_len)
@@ -205,7 +200,6 @@ struct proto pingv6_prot = {
 	.owner =	THIS_MODULE,
 	.init =		ping_init_sock,
 	.close =	ping_close,
-	.destroy =	ping_v6_destroy,
 	.pre_connect =	ping_v6_pre_connect,
 	.connect =	ip6_datagram_connect_v6_only,
 	.disconnect =	__udp_disconnect,
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 9ee1506e23ab..4fc511bdf176 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1175,8 +1175,6 @@ static void raw6_destroy(struct sock *sk)
 	lock_sock(sk);
 	ip6_flush_pending_frames(sk);
 	release_sock(sk);
-
-	inet6_destroy_sock(sk);
 }
 
 static int rawv6_init_sk(struct sock *sk)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index ea1ecf5fe947..81afb40bfc0b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1951,12 +1951,6 @@ static int tcp_v6_init_sock(struct sock *sk)
 	return 0;
 }
 
-static void tcp_v6_destroy_sock(struct sock *sk)
-{
-	tcp_v4_destroy_sock(sk);
-	inet6_destroy_sock(sk);
-}
-
 #ifdef CONFIG_PROC_FS
 /* Proc filesystem TCPv6 sock list dumping. */
 static void get_openreq6(struct seq_file *seq,
@@ -2149,7 +2143,7 @@ struct proto tcpv6_prot = {
 	.accept			= inet_csk_accept,
 	.ioctl			= tcp_ioctl,
 	.init			= tcp_v6_init_sock,
-	.destroy		= tcp_v6_destroy_sock,
+	.destroy		= tcp_v4_destroy_sock,
 	.shutdown		= tcp_shutdown,
 	.setsockopt		= tcp_setsockopt,
 	.getsockopt		= tcp_getsockopt,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 98a64e8d9bda..ada0cb14c1f1 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1666,8 +1666,6 @@ void udpv6_destroy_sock(struct sock *sk)
 			udp_encap_disable();
 		}
 	}
-
-	inet6_destroy_sock(sk);
 }
 
 /*
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 9db7f4f5a441..5137ea1861ce 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -257,8 +257,6 @@ static void l2tp_ip6_destroy_sock(struct sock *sk)
 
 	if (tunnel)
 		l2tp_tunnel_delete(tunnel);
-
-	inet6_destroy_sock(sk);
 }
 
 static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index f0cde2d7233d..fe639a1fdb4f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3939,12 +3939,6 @@ static const struct proto_ops mptcp_v6_stream_ops = {
 
 static struct proto mptcp_v6_prot;
 
-static void mptcp_v6_destroy(struct sock *sk)
-{
-	mptcp_destroy(sk);
-	inet6_destroy_sock(sk);
-}
-
 static struct inet_protosw mptcp_v6_protosw = {
 	.type		= SOCK_STREAM,
 	.protocol	= IPPROTO_MPTCP,
@@ -3960,7 +3954,6 @@ int __init mptcp_proto_v6_init(void)
 	mptcp_v6_prot = mptcp_prot;
 	strcpy(mptcp_v6_prot.name, "MPTCPv6");
 	mptcp_v6_prot.slab = NULL;
-	mptcp_v6_prot.destroy = mptcp_v6_destroy;
 	mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock);
 
 	err = proto_register(&mptcp_v6_prot, 1);
-- 
2.25.1