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From: Kishen Maloor <kishen.maloor@intel.com>
To: kishen.maloor@intel.com, mptcp@lists.linux.dev
Subject: [PATCH mptcp-next v2 11/21] mptcp: read attributes of addr entries managed by userspace PMs
Date: Wed, 12 Jan 2022 17:15:13 -0500	[thread overview]
Message-ID: <20220112221523.1829397-12-kishen.maloor@intel.com> (raw)
In-Reply-To: <20220112221523.1829397-1-kishen.maloor@intel.com>

This change introduces a parallel path in the kernel for retrieving
the local id, flags, if_index for an addr entry in the context of
an MPTCP connection that's being managed by a userspace PM. The
userspace and in-kernel PM modes deviate in their procedures for
obtaining this information.

Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
---
 net/mptcp/pm_netlink.c | 101 ++++++++++++++++++++++++++++-------------
 net/mptcp/protocol.h   |   2 +-
 net/mptcp/subflow.c    |   2 +-
 3 files changed, 71 insertions(+), 34 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 052a803a7f71..40c41a0498fc 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1175,6 +1175,7 @@ int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
 	struct mptcp_addr_info msk_local;
 	struct pm_nl_pernet *pernet;
 	int ret = -1;
+	int pm_type;
 
 	if (WARN_ON_ONCE(!msk))
 		return -1;
@@ -1192,31 +1193,50 @@ int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
 
 	pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id);
 
-	rcu_read_lock();
-	list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
-		if (addresses_equal(&entry->addr, &skc_local, entry->addr.port)) {
-			ret = entry->addr.id;
-			break;
-		}
-	}
-	rcu_read_unlock();
-	if (ret >= 0)
-		return ret;
-
 	/* address not found, add to local list */
-	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
-	if (!entry)
-		return -ENOMEM;
-
-	entry->addr = skc_local;
-	entry->addr.id = 0;
-	entry->addr.port = 0;
-	entry->ifindex = 0;
-	entry->flags = 0;
-	entry->lsk_ref = NULL;
-	ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
-	if (ret < 0)
-		kfree(entry);
+
+	pm_type = READ_ONCE(msk->pm.pm_type);
+
+	if (pm_type == MPTCP_PM_TYPE_KERNEL) {
+		rcu_read_lock();
+		list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
+			if (addresses_equal(&entry->addr, &skc_local, entry->addr.port)) {
+				ret = entry->addr.id;
+				break;
+			}
+		}
+		rcu_read_unlock();
+
+		if (ret >= 0)
+			return ret;
+
+		entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+		if (!entry)
+			return -ENOMEM;
+
+		entry->addr = skc_local;
+		entry->addr.id = 0;
+		entry->addr.port = 0;
+		entry->ifindex = 0;
+		entry->flags = 0;
+		entry->lsk_ref = NULL;
+		ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
+		if (ret < 0)
+			kfree(entry);
+	} else if (pm_type == MPTCP_PM_TYPE_USERSPACE) {
+		struct mptcp_pm_addr_entry new_entry;
+		__be16 msk_sport =  ((struct inet_sock *)
+				     inet_sk((struct sock *)msk))->inet_sport;
+
+		memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
+		new_entry.addr = skc_local;
+		new_entry.addr.id = 0;
+
+		if (new_entry.addr.port == msk_sport)
+			new_entry.addr.port = 0;
+
+		ret = mptcp_userspace_pm_append_new_local_addr(msk, &new_entry);
+	}
 
 	return ret;
 }
@@ -1461,22 +1481,39 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
 	return 0;
 }
 
-int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
+int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
 					 u8 *flags, int *ifindex)
 {
-	struct mptcp_pm_addr_entry *entry;
+	struct mptcp_pm_addr_entry *entry, *match = NULL;
+	struct sock *sk = (struct sock *)msk;
+	struct net *net = sock_net(sk);
 
 	*flags = 0;
 	*ifindex = 0;
 
 	if (id) {
-		rcu_read_lock();
-		entry = __lookup_addr_by_id(net_generic(net, pm_nl_pernet_id), id);
-		if (entry) {
-			*flags = entry->flags;
-			*ifindex = entry->ifindex;
+		if (READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL) {
+			rcu_read_lock();
+			entry = __lookup_addr_by_id(net_generic(net, pm_nl_pernet_id), id);
+			if (entry) {
+				*flags = entry->flags;
+				*ifindex = entry->ifindex;
+			}
+			rcu_read_unlock();
+		} else {
+			mptcp_data_lock(sk);
+			list_for_each_entry(entry, &msk->local_addr_list, list) {
+				if (id == entry->addr.id) {
+					match = entry;
+					break;
+				}
+			}
+			mptcp_data_unlock(sk);
+			if (match) {
+				*flags = match->flags;
+				*ifindex = match->ifindex;
+			}
 		}
-		rcu_read_unlock();
 	}
 
 	return 0;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 63b4ea850d07..c6f7c22d0e11 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -772,7 +772,7 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 struct mptcp_pm_add_entry *
 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
 				struct mptcp_addr_info *addr);
-int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
+int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
 					 u8 *flags, int *ifindex);
 
 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index b75b7b186d34..29e51986c985 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1419,7 +1419,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
 		local_id = err;
 	}
 
-	mptcp_pm_get_flags_and_ifindex_by_id(sock_net(sk), local_id,
+	mptcp_pm_get_flags_and_ifindex_by_id(msk, local_id,
 					     &flags, &ifindex);
 	subflow->remote_key = msk->remote_key;
 	subflow->local_key = msk->local_key;
-- 
2.31.1


  parent reply	other threads:[~2022-01-12 22:16 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-12 22:15 [PATCH mptcp-next v2 00/21] mptcp: support userspace path management Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 01/21] mptcp: do not restrict subflows with non-kernel PMs Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 02/21] mptcp: store remote id from MP_JOIN SYN/ACK in local ctx Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 03/21] mptcp: reflect remote port (not 0) in ANNOUNCED events Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 04/21] mptcp: establish subflows from either end of connection Kishen Maloor
2022-01-14 22:43   ` Mat Martineau
2022-01-17  8:59     ` Paolo Abeni
2022-01-19  1:26       ` Kishen Maloor
2022-01-19 12:01         ` Paolo Abeni
2022-01-19 17:59           ` Kishen Maloor
2022-01-19 18:59             ` Mat Martineau
2022-01-12 22:15 ` [PATCH mptcp-next v2 05/21] mptcp: netlink: store per namespace list of refcounted listen socks Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 06/21] mptcp: netlink: store lsk ref in mptcp_pm_addr_entry Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 07/21] mptcp: netlink: process IPv6 addrs in creating listening sockets Kishen Maloor
2022-01-14 15:27   ` Paolo Abeni
2022-01-14 22:09     ` Mat Martineau
2022-01-19  1:25       ` Kishen Maloor
2022-01-19 19:14         ` Mat Martineau
2022-01-12 22:15 ` [PATCH mptcp-next v2 08/21] mptcp: attempt to add listening sockets for announced addrs Kishen Maloor
2022-01-14 15:54   ` Paolo Abeni
2022-01-14 17:47     ` Matthieu Baerts
2022-01-14 22:26     ` Mat Martineau
2022-01-19  1:20     ` Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 09/21] mptcp: allow ADD_ADDR reissuance by userspace PMs Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 10/21] mptcp: handle local addrs announced " Kishen Maloor
2022-01-14 17:11   ` Paolo Abeni
2022-01-19  1:24     ` Kishen Maloor
2022-01-19 19:20       ` Mat Martineau
2022-01-19 20:27         ` Kishen Maloor
2022-01-19 20:44           ` Mat Martineau
2022-01-19 21:30             ` Kishen Maloor
2022-01-12 22:15 ` Kishen Maloor [this message]
2022-01-12 22:15 ` [PATCH mptcp-next v2 12/21] mptcp: netlink: split mptcp_pm_parse_addr into two functions Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 13/21] mptcp: netlink: Add MPTCP_PM_CMD_ANNOUNCE Kishen Maloor
2022-01-14 17:04   ` Paolo Abeni
2022-01-19  1:21     ` Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 14/21] mptcp: selftests: support MPTCP_PM_CMD_ANNOUNCE Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 15/21] mptcp: netlink: Add MPTCP_PM_CMD_REMOVE Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 16/21] mptcp: selftests: support MPTCP_PM_CMD_REMOVE Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 17/21] mptcp: netlink: allow userspace-driven subflow establishment Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 18/21] mptcp: selftests: support MPTCP_PM_CMD_SUBFLOW_CREATE Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 19/21] mptcp: selftests: support MPTCP_PM_CMD_SUBFLOW_DESTROY Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 20/21] mptcp: selftests: capture netlink events Kishen Maloor
2022-01-12 22:15 ` [PATCH mptcp-next v2 21/21] selftests: mptcp: functional tests for the userspace PM type Kishen Maloor
2022-01-12 22:35   ` selftests: mptcp: functional tests for the userspace PM type: Build Failure MPTCP CI

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