Merge branch 'mptcp-fixes-and-cleanup-for-v6-7'

Mat Martineau says:

====================
mptcp: Fixes and cleanup for v6.7

This series includes three initial patches that we had queued in our
mptcp-net branch, but given the likely timing of net/net-next syncs this
week, the need to avoid introducing branch conflicts, and another batch
of net-next patches pending in the mptcp tree, the most practical route
is to send everything for net-next.

Patches 1 & 2 fix some intermittent selftest failures by adjusting timing.

Patch 3 removes an unneccessary userspace path manager restriction on
the removal of subflows with subflow ID 0.

The remainder of the patches are all cleanup or selftest changes:

Patches 4-8 clean up kernel code by removing unused parameters, making
more consistent use of existing helper functions, and reducing extra
casting of socket pointers.

Patch 9 removes an unused variable in a selftest script.

Patch 10 adds a little more detail to some mptcp_join test output.
====================

Link: https://lore.kernel.org/r/20231025-send-net-next-20231025-v1-0-db8f25f798eb@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 65 insertions, 16 deletions

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 0f92e5b13a8a..5c01b9bc619a 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -152,6 +152,7 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 	struct mptcp_pm_addr_entry addr_val;
 	struct mptcp_sock *msk;
 	int err = -EINVAL;
+	struct sock *sk;
 	u32 token_val;
 
 	if (!addr || !token) {
@@ -167,6 +168,8 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 		return err;
 	}
 
+	sk = (struct sock *)msk;
+
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
 		goto announce_err;
@@ -190,7 +193,7 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 		goto announce_err;
 	}
 
-	lock_sock((struct sock *)msk);
+	lock_sock(sk);
 	spin_lock_bh(&msk->pm.lock);
 
 	if (mptcp_pm_alloc_anno_list(msk, &addr_val.addr)) {
@@ -200,11 +203,45 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	spin_unlock_bh(&msk->pm.lock);
-	release_sock((struct sock *)msk);
+	release_sock(sk);
 
 	err = 0;
  announce_err:
-	sock_put((struct sock *)msk);
+	sock_put(sk);
+	return err;
+}
+
+static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk,
+						     struct genl_info *info)
+{
+	struct mptcp_rm_list list = { .nr = 0 };
+	struct mptcp_subflow_context *subflow;
+	struct sock *sk = (struct sock *)msk;
+	bool has_id_0 = false;
+	int err = -EINVAL;
+
+	lock_sock(sk);
+	mptcp_for_each_subflow(msk, subflow) {
+		if (subflow->local_id == 0) {
+			has_id_0 = true;
+			break;
+		}
+	}
+	if (!has_id_0) {
+		GENL_SET_ERR_MSG(info, "address with id 0 not found");
+		goto remove_err;
+	}
+
+	list.ids[list.nr++] = 0;
+
+	spin_lock_bh(&msk->pm.lock);
+	mptcp_pm_remove_addr(msk, &list);
+	spin_unlock_bh(&msk->pm.lock);
+
+	err = 0;
+
+remove_err:
+	release_sock(sk);
 	return err;
 }
 
@@ -217,6 +254,7 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 	struct mptcp_sock *msk;
 	LIST_HEAD(free_list);
 	int err = -EINVAL;
+	struct sock *sk;
 	u32 token_val;
 	u8 id_val;
 
@@ -234,12 +272,19 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 		return err;
 	}
 
+	sk = (struct sock *)msk;
+
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
 		goto remove_err;
 	}
 
-	lock_sock((struct sock *)msk);
+	if (id_val == 0) {
+		err = mptcp_userspace_pm_remove_id_zero_address(msk, info);
+		goto remove_err;
+	}
+
+	lock_sock(sk);
 
 	list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
 		if (entry->addr.id == id_val) {
@@ -250,7 +295,7 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 
 	if (!match) {
 		GENL_SET_ERR_MSG(info, "address with specified id not found");
-		release_sock((struct sock *)msk);
+		release_sock(sk);
 		goto remove_err;
 	}
 
@@ -258,15 +303,15 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 
 	mptcp_pm_remove_addrs(msk, &free_list);
 
-	release_sock((struct sock *)msk);
+	release_sock(sk);
 
 	list_for_each_entry_safe(match, entry, &free_list, list) {
-		sock_kfree_s((struct sock *)msk, match, sizeof(*match));
+		sock_kfree_s(sk, match, sizeof(*match));
 	}
 
 	err = 0;
  remove_err:
-	sock_put((struct sock *)msk);
+	sock_put(sk);
 	return err;
 }
 
@@ -296,6 +341,8 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
 		return err;
 	}
 
+	sk = (struct sock *)msk;
+
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
 		goto create_err;
@@ -313,8 +360,6 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
 		goto create_err;
 	}
 
-	sk = (struct sock *)msk;
-
 	if (!mptcp_pm_addr_families_match(sk, &addr_l, &addr_r)) {
 		GENL_SET_ERR_MSG(info, "families mismatch");
 		err = -EINVAL;
@@ -342,7 +387,7 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
 	spin_unlock_bh(&msk->pm.lock);
 
  create_err:
-	sock_put((struct sock *)msk);
+	sock_put(sk);
 	return err;
 }
 
@@ -419,6 +464,8 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 		return err;
 	}
 
+	sk = (struct sock *)msk;
+
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
 		goto destroy_err;
@@ -448,7 +495,6 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 		goto destroy_err;
 	}
 
-	sk = (struct sock *)msk;
 	lock_sock(sk);
 	ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
 	if (ssk) {
@@ -468,7 +514,7 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 	release_sock(sk);
 
 destroy_err:
-	sock_put((struct sock *)msk);
+	sock_put(sk);
 	return err;
 }
 
@@ -478,6 +524,7 @@ int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
 {
 	struct mptcp_sock *msk;
 	int ret = -EINVAL;
+	struct sock *sk;
 	u32 token_val;
 
 	token_val = nla_get_u32(token);
@@ -486,6 +533,8 @@ int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
 	if (!msk)
 		return ret;
 
+	sk = (struct sock *)msk;
+
 	if (!mptcp_pm_is_userspace(msk))
 		goto set_flags_err;
 
@@ -493,11 +542,11 @@ int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
 	    rem->addr.family == AF_UNSPEC)
 		goto set_flags_err;
 
-	lock_sock((struct sock *)msk);
+	lock_sock(sk);
 	ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup);
-	release_sock((struct sock *)msk);
+	release_sock(sk);
 
 set_flags_err:
-	sock_put((struct sock *)msk);
+	sock_put(sk);
 	return ret;
 }