[PATCH 6.1 0/3] inet6: Backport complete patchset for inet6_destroy_sock() call modificatioin

[PATCH 6.1 0/3] inet6: Backport complete patchset for inet6_destroy_sock() call modificatioin

[Ziyang Xuan]

6.1 LTS has backported commit ca43ccf41224 ("dccp/tcp: Avoid negative
sk_forward_alloc by ipv6_pinfo.pktoptions.") and commit 62ec33b44e0f ("net:
Remove WARN_ON_ONCE(sk->sk_forward_alloc) from sk_stream_kill_queues()."),
but these are incomplete. There are some patches that have not been
backported including key pre-patch commit b5fc29233d28 ("inet6: Remove
inet6_destroy_sock() in sk->sk_prot->destroy().").

Backport complete patchset for inet6_destroy_sock() call modificatioin.

Kuniyuki Iwashima (3):
  inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy().
  dccp: Call inet6_destroy_sock() via sk->sk_destruct().
  sctp: Call inet6_destroy_sock() via sk->sk_destruct().

 net/dccp/dccp.h      |  1 +
 net/dccp/ipv6.c      | 15 ++++++++-------
 net/dccp/proto.c     |  8 +++++++-
 net/ipv6/af_inet6.c  |  1 +
 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 -------
 net/sctp/socket.c    | 29 +++++++++++++++++++++--------
 11 files changed, 39 insertions(+), 42 deletions(-)

-- 
2.25.1

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

[Ziyang Xuan]

From: Kuniyuki Iwashima <kuniyu@amazon.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@amazon.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.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

[PATCH 6.1 2/3] dccp: Call inet6_destroy_sock() via sk->sk_destruct().

[Ziyang Xuan]

From: Kuniyuki Iwashima <kuniyu@amazon.com>

commit 1651951ebea54970e0bda60c638fc2eee7a6218f 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.

DCCP sets its own sk->sk_destruct() in the dccp_init_sock(), and
DCCPv6 socket shares it by calling the same init function via
dccp_v6_init_sock().

To call inet6_sock_destruct() from DCCPv6 sk->sk_destruct(), we
export it and set dccp_v6_sk_destruct() in the init function.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
---
 net/dccp/dccp.h     |  1 +
 net/dccp/ipv6.c     | 15 ++++++++-------
 net/dccp/proto.c    |  8 +++++++-
 net/ipv6/af_inet6.c |  1 +
 4 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 7dfc00c9fb32..9ddc3a9e89e4 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -278,6 +278,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
 			 const struct dccp_hdr *dh, const unsigned int len);
 
+void dccp_destruct_common(struct sock *sk);
 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
 void dccp_destroy_sock(struct sock *sk);
 
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 7a736c352dc4..b9d7c3dd1cb3 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1004,6 +1004,12 @@ static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
 	.sockaddr_len	   = sizeof(struct sockaddr_in6),
 };
 
+static void dccp_v6_sk_destruct(struct sock *sk)
+{
+	dccp_destruct_common(sk);
+	inet6_sock_destruct(sk);
+}
+
 /* NOTE: A lot of things set to zero explicitly by call to
  *       sk_alloc() so need not be done here.
  */
@@ -1016,17 +1022,12 @@ static int dccp_v6_init_sock(struct sock *sk)
 		if (unlikely(!dccp_v6_ctl_sock_initialized))
 			dccp_v6_ctl_sock_initialized = 1;
 		inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
+		sk->sk_destruct = dccp_v6_sk_destruct;
 	}
 
 	return err;
 }
 
-static void dccp_v6_destroy_sock(struct sock *sk)
-{
-	dccp_destroy_sock(sk);
-	inet6_destroy_sock(sk);
-}
-
 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
 	.twsk_obj_size	= sizeof(struct dccp6_timewait_sock),
 };
@@ -1049,7 +1050,7 @@ static struct proto dccp_v6_prot = {
 	.accept		   = inet_csk_accept,
 	.get_port	   = inet_csk_get_port,
 	.shutdown	   = dccp_shutdown,
-	.destroy	   = dccp_v6_destroy_sock,
+	.destroy	   = dccp_destroy_sock,
 	.orphan_count	   = &dccp_orphan_count,
 	.max_header	   = MAX_DCCP_HEADER,
 	.obj_size	   = sizeof(struct dccp6_sock),
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 85e35c5e8890..a06b5641287a 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -171,12 +171,18 @@ const char *dccp_packet_name(const int type)
 
 EXPORT_SYMBOL_GPL(dccp_packet_name);
 
-static void dccp_sk_destruct(struct sock *sk)
+void dccp_destruct_common(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 
 	ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
 	dp->dccps_hc_tx_ccid = NULL;
+}
+EXPORT_SYMBOL_GPL(dccp_destruct_common);
+
+static void dccp_sk_destruct(struct sock *sk)
+{
+	dccp_destruct_common(sk);
 	inet_sock_destruct(sk);
 }
 
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index fb1bf6eb0ff8..b5309ae87fd7 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -114,6 +114,7 @@ void inet6_sock_destruct(struct sock *sk)
 	inet6_cleanup_sock(sk);
 	inet_sock_destruct(sk);
 }
+EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 
 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 			int kern)
-- 
2.25.1

[PATCH 6.1 3/3] sctp: Call inet6_destroy_sock() via sk->sk_destruct().

[Ziyang Xuan]

From: Kuniyuki Iwashima <kuniyu@amazon.com>

commit 6431b0f6ff1633ae598667e4cdd93830074a03e8 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.

SCTP sets its own sk->sk_destruct() in the sctp_init_sock(), and
SCTPv6 socket reuses it as the init function.

To call inet6_sock_destruct() from SCTPv6 sk->sk_destruct(), we
set sctp_v6_destruct_sock() in a new init function.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
---
 net/sctp/socket.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 507b2ad5ef7c..17185200079d 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5102,13 +5102,17 @@ static void sctp_destroy_sock(struct sock *sk)
 }
 
 /* Triggered when there are no references on the socket anymore */
-static void sctp_destruct_sock(struct sock *sk)
+static void sctp_destruct_common(struct sock *sk)
 {
 	struct sctp_sock *sp = sctp_sk(sk);
 
 	/* Free up the HMAC transform. */
 	crypto_free_shash(sp->hmac);
+}
 
+static void sctp_destruct_sock(struct sock *sk)
+{
+	sctp_destruct_common(sk);
 	inet_sock_destruct(sk);
 }
 
@@ -9431,7 +9435,7 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
 	sctp_sk(newsk)->reuse = sp->reuse;
 
 	newsk->sk_shutdown = sk->sk_shutdown;
-	newsk->sk_destruct = sctp_destruct_sock;
+	newsk->sk_destruct = sk->sk_destruct;
 	newsk->sk_family = sk->sk_family;
 	newsk->sk_protocol = IPPROTO_SCTP;
 	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
@@ -9666,11 +9670,20 @@ struct proto sctp_prot = {
 
 #if IS_ENABLED(CONFIG_IPV6)
 
-#include <net/transp_v6.h>
-static void sctp_v6_destroy_sock(struct sock *sk)
+static void sctp_v6_destruct_sock(struct sock *sk)
+{
+	sctp_destruct_common(sk);
+	inet6_sock_destruct(sk);
+}
+
+static int sctp_v6_init_sock(struct sock *sk)
 {
-	sctp_destroy_sock(sk);
-	inet6_destroy_sock(sk);
+	int ret = sctp_init_sock(sk);
+
+	if (!ret)
+		sk->sk_destruct = sctp_v6_destruct_sock;
+
+	return ret;
 }
 
 struct proto sctpv6_prot = {
@@ -9680,8 +9693,8 @@ struct proto sctpv6_prot = {
 	.disconnect	= sctp_disconnect,
 	.accept		= sctp_accept,
 	.ioctl		= sctp_ioctl,
-	.init		= sctp_init_sock,
-	.destroy	= sctp_v6_destroy_sock,
+	.init		= sctp_v6_init_sock,
+	.destroy	= sctp_destroy_sock,
 	.shutdown	= sctp_shutdown,
 	.setsockopt	= sctp_setsockopt,
 	.getsockopt	= sctp_getsockopt,
-- 
2.25.1

Re: [PATCH 6.1 0/3] inet6: Backport complete patchset for inet6_destroy_sock() call modificatioin

[Greg KH]

On Thu, Apr 20, 2023 at 12:39:46PM +0800, Ziyang Xuan wrote:
> 6.1 LTS has backported commit ca43ccf41224 ("dccp/tcp: Avoid negative
> sk_forward_alloc by ipv6_pinfo.pktoptions.") and commit 62ec33b44e0f ("net:
> Remove WARN_ON_ONCE(sk->sk_forward_alloc) from sk_stream_kill_queues()."),
> but these are incomplete. There are some patches that have not been
> backported including key pre-patch commit b5fc29233d28 ("inet6: Remove
> inet6_destroy_sock() in sk->sk_prot->destroy().").
> 
> Backport complete patchset for inet6_destroy_sock() call modificatioin.
> 
> Kuniyuki Iwashima (3):
>   inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy().
>   dccp: Call inet6_destroy_sock() via sk->sk_destruct().
>   sctp: Call inet6_destroy_sock() via sk->sk_destruct().
> 
>  net/dccp/dccp.h      |  1 +
>  net/dccp/ipv6.c      | 15 ++++++++-------
>  net/dccp/proto.c     |  8 +++++++-
>  net/ipv6/af_inet6.c  |  1 +
>  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 -------
>  net/sctp/socket.c    | 29 +++++++++++++++++++++--------
>  11 files changed, 39 insertions(+), 42 deletions(-)
> 
> -- 
> 2.25.1
> 

All now queued up, thanks.

greg k-h