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authorMat Martineau <mathew.j.martineau@linux.intel.com>2022-04-27 15:50:01 -0700
committerJakub Kicinski <kuba@kernel.org>2022-04-29 17:25:14 -0700
commit6bb63ccc25d4a8cb8fe48efeda680cb13f84d1b0 (patch)
tree27a07b92bb40e431961f8ea6cb58b35e984fc353
parent6961326e38fe571ac1d2180041ce3142c8fd24d5 (diff)
mptcp: Add a per-namespace sysctl to set the default path manager type
The new net.mptcp.pm_type sysctl determines which path manager will be used by each newly-created MPTCP socket. v2: Handle builds without CONFIG_SYSCTL v3: Clarify logic for type-specific PM init (Geliang Tang and Paolo Abeni) Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--Documentation/networking/mptcp-sysctl.rst18
-rw-r--r--net/mptcp/ctrl.c21
-rw-r--r--net/mptcp/pm.c34
-rw-r--r--net/mptcp/protocol.h1
4 files changed, 63 insertions, 11 deletions
diff --git a/Documentation/networking/mptcp-sysctl.rst b/Documentation/networking/mptcp-sysctl.rst
index b0d4da71e68e..e263dfcc4b40 100644
--- a/Documentation/networking/mptcp-sysctl.rst
+++ b/Documentation/networking/mptcp-sysctl.rst
@@ -46,6 +46,24 @@ allow_join_initial_addr_port - BOOLEAN
Default: 1
+pm_type - INTEGER
+
+ Set the default path manager type to use for each new MPTCP
+ socket. In-kernel path management will control subflow
+ connections and address advertisements according to
+ per-namespace values configured over the MPTCP netlink
+ API. Userspace path management puts per-MPTCP-connection subflow
+ connection decisions and address advertisements under control of
+ a privileged userspace program, at the cost of more netlink
+ traffic to propagate all of the related events and commands.
+
+ This is a per-namespace sysctl.
+
+ * 0 - In-kernel path manager
+ * 1 - Userspace path manager
+
+ Default: 0
+
stale_loss_cnt - INTEGER
The number of MPTCP-level retransmission intervals with no traffic and
pending outstanding data on a given subflow required to declare it stale.
diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 8b235468c88f..ae20b7d92e28 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -16,6 +16,11 @@
#define MPTCP_SYSCTL_PATH "net/mptcp"
static int mptcp_pernet_id;
+
+#ifdef CONFIG_SYSCTL
+static int mptcp_pm_type_max = __MPTCP_PM_TYPE_MAX;
+#endif
+
struct mptcp_pernet {
#ifdef CONFIG_SYSCTL
struct ctl_table_header *ctl_table_hdr;
@@ -26,6 +31,7 @@ struct mptcp_pernet {
u8 mptcp_enabled;
u8 checksum_enabled;
u8 allow_join_initial_addr_port;
+ u8 pm_type;
};
static struct mptcp_pernet *mptcp_get_pernet(const struct net *net)
@@ -58,6 +64,11 @@ unsigned int mptcp_stale_loss_cnt(const struct net *net)
return mptcp_get_pernet(net)->stale_loss_cnt;
}
+int mptcp_get_pm_type(const struct net *net)
+{
+ return mptcp_get_pernet(net)->pm_type;
+}
+
static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
{
pernet->mptcp_enabled = 1;
@@ -65,6 +76,7 @@ static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
pernet->checksum_enabled = 0;
pernet->allow_join_initial_addr_port = 1;
pernet->stale_loss_cnt = 4;
+ pernet->pm_type = MPTCP_PM_TYPE_KERNEL;
}
#ifdef CONFIG_SYSCTL
@@ -108,6 +120,14 @@ static struct ctl_table mptcp_sysctl_table[] = {
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
},
+ {
+ .procname = "pm_type",
+ .maxlen = sizeof(u8),
+ .mode = 0644,
+ .proc_handler = proc_dou8vec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = &mptcp_pm_type_max
+ },
{}
};
@@ -128,6 +148,7 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
table[2].data = &pernet->checksum_enabled;
table[3].data = &pernet->allow_join_initial_addr_port;
table[4].data = &pernet->stale_loss_cnt;
+ table[5].data = &pernet->pm_type;
hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
if (!hdr)
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 5320270b3926..57f67578a47f 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -415,7 +415,7 @@ void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)
void mptcp_pm_data_reset(struct mptcp_sock *msk)
{
- bool subflows_allowed = !!mptcp_pm_get_subflows_max(msk);
+ u8 pm_type = mptcp_get_pm_type(sock_net((struct sock *)msk));
struct mptcp_pm_data *pm = &msk->pm;
pm->add_addr_signaled = 0;
@@ -424,17 +424,29 @@ void mptcp_pm_data_reset(struct mptcp_sock *msk)
pm->subflows = 0;
pm->rm_list_tx.nr = 0;
pm->rm_list_rx.nr = 0;
- WRITE_ONCE(pm->pm_type, MPTCP_PM_TYPE_KERNEL);
- /* pm->work_pending must be only be set to 'true' when
- * pm->pm_type is set to MPTCP_PM_TYPE_KERNEL
- */
- WRITE_ONCE(pm->work_pending,
- (!!mptcp_pm_get_local_addr_max(msk) && subflows_allowed) ||
- !!mptcp_pm_get_add_addr_signal_max(msk));
+ WRITE_ONCE(pm->pm_type, pm_type);
+
+ if (pm_type == MPTCP_PM_TYPE_KERNEL) {
+ bool subflows_allowed = !!mptcp_pm_get_subflows_max(msk);
+
+ /* pm->work_pending must be only be set to 'true' when
+ * pm->pm_type is set to MPTCP_PM_TYPE_KERNEL
+ */
+ WRITE_ONCE(pm->work_pending,
+ (!!mptcp_pm_get_local_addr_max(msk) &&
+ subflows_allowed) ||
+ !!mptcp_pm_get_add_addr_signal_max(msk));
+ WRITE_ONCE(pm->accept_addr,
+ !!mptcp_pm_get_add_addr_accept_max(msk) &&
+ subflows_allowed);
+ WRITE_ONCE(pm->accept_subflow, subflows_allowed);
+ } else {
+ WRITE_ONCE(pm->work_pending, 0);
+ WRITE_ONCE(pm->accept_addr, 0);
+ WRITE_ONCE(pm->accept_subflow, 0);
+ }
+
WRITE_ONCE(pm->addr_signal, 0);
- WRITE_ONCE(pm->accept_addr,
- !!mptcp_pm_get_add_addr_accept_max(msk) && subflows_allowed);
- WRITE_ONCE(pm->accept_subflow, subflows_allowed);
WRITE_ONCE(pm->remote_deny_join_id0, false);
pm->status = 0;
bitmap_fill(msk->pm.id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 79606e9d3f2a..54d2b3b2d100 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -585,6 +585,7 @@ unsigned int mptcp_get_add_addr_timeout(const struct net *net);
int mptcp_is_checksum_enabled(const struct net *net);
int mptcp_allow_join_id0(const struct net *net);
unsigned int mptcp_stale_loss_cnt(const struct net *net);
+int mptcp_get_pm_type(const struct net *net);
void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
struct mptcp_options_received *mp_opt);
bool __mptcp_retransmit_pending_data(struct sock *sk);