Patch "mptcp: add address into userspace pm list" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    mptcp: add address into userspace pm list

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mptcp-add-address-into-userspace-pm-list.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 24430f8bf51655c5ab7ddc2fafe939dd3cd0dd47 Mon Sep 17 00:00:00 2001
From: Geliang Tang <geliang.tang@xxxxxxxx>
Date: Sun, 4 Jun 2023 20:25:19 -0700
Subject: mptcp: add address into userspace pm list

From: Geliang Tang <geliang.tang@xxxxxxxx>

commit 24430f8bf51655c5ab7ddc2fafe939dd3cd0dd47 upstream.

Add the address into userspace_pm_local_addr_list when the subflow is
created. Make sure it can be found in mptcp_nl_cmd_remove(). And delete
it in the new helper mptcp_userspace_pm_delete_local_addr().

By doing this, the "REMOVE" command also works with subflows that have
been created via the "SUB_CREATE" command instead of restricting to
the addresses that have been announced via the "ANNOUNCE" command.

Fixes: d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
Link: https://github.com/multipath-tcp/mptcp_net-next/issues/379
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Signed-off-by: Geliang Tang <geliang.tang@xxxxxxxx>
Signed-off-by: Mat Martineau <martineau@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/mptcp/pm_userspace.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -78,6 +78,30 @@ int mptcp_userspace_pm_append_new_local_
 	return ret;
 }
 
+/* If the subflow is closed from the other peer (not via a
+ * subflow destroy command then), we want to keep the entry
+ * not to assign the same ID to another address and to be
+ * able to send RM_ADDR after the removal of the subflow.
+ */
+static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
+						struct mptcp_pm_addr_entry *addr)
+{
+	struct mptcp_pm_addr_entry *entry, *tmp;
+
+	list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
+		if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
+			/* TODO: a refcount is needed because the entry can
+			 * be used multiple times (e.g. fullmesh mode).
+			 */
+			list_del_rcu(&entry->list);
+			kfree(entry);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
 						   unsigned int id,
 						   u8 *flags, int *ifindex)
@@ -250,6 +274,7 @@ int mptcp_nl_cmd_sf_create(struct sk_buf
 	struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
 	struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
 	struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
+	struct mptcp_pm_addr_entry local = { 0 };
 	struct mptcp_addr_info addr_r;
 	struct mptcp_addr_info addr_l;
 	struct mptcp_sock *msk;
@@ -301,12 +326,24 @@ int mptcp_nl_cmd_sf_create(struct sk_buf
 		goto create_err;
 	}
 
+	local.addr = addr_l;
+	err = mptcp_userspace_pm_append_new_local_addr(msk, &local);
+	if (err < 0) {
+		GENL_SET_ERR_MSG(info, "did not match address and id");
+		goto create_err;
+	}
+
 	lock_sock(sk);
 
 	err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
 
 	release_sock(sk);
 
+	spin_lock_bh(&msk->pm.lock);
+	if (err)
+		mptcp_userspace_pm_delete_local_addr(msk, &local);
+	spin_unlock_bh(&msk->pm.lock);
+
  create_err:
 	sock_put((struct sock *)msk);
 	return err;
@@ -419,7 +456,11 @@ int mptcp_nl_cmd_sf_destroy(struct sk_bu
 	ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
 	if (ssk) {
 		struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+		struct mptcp_pm_addr_entry entry = { .addr = addr_l };
 
+		spin_lock_bh(&msk->pm.lock);
+		mptcp_userspace_pm_delete_local_addr(msk, &entry);
+		spin_unlock_bh(&msk->pm.lock);
 		mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
 		mptcp_close_ssk(sk, ssk, subflow);
 		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);


Patches currently in stable-queue which might be from geliang.tang@xxxxxxxx are

queue-6.1/mptcp-add-address-into-userspace-pm-list.patch
queue-6.1/mptcp-update-userspace-pm-infos.patch
queue-6.1/selftests-mptcp-update-userspace-pm-addr-tests.patch
queue-6.1/selftests-mptcp-update-userspace-pm-subflow-tests.patch
queue-6.1/mptcp-only-send-rm_addr-in-nl_cmd_remove.patch



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