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Message-Id: <20221130140637.409926-7-matthieu.baerts@tessares.net>
Date: Wed, 30 Nov 2022 15:06:28 +0100
From: Matthieu Baerts <matthieu.baerts@...sares.net>
To: Mat Martineau <mathew.j.martineau@...ux.intel.com>,
Matthieu Baerts <matthieu.baerts@...sares.net>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Geliang Tang <geliang.tang@...e.com>, netdev@...r.kernel.org,
mptcp@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 06/11] mptcp: add pm listener events
From: Geliang Tang <geliang.tang@...e.com>
This patch adds two new MPTCP netlink event types for PM listening
socket create and close, named MPTCP_EVENT_LISTENER_CREATED and
MPTCP_EVENT_LISTENER_CLOSED.
Add a new function mptcp_event_pm_listener() to push the new events
with family, port and addr to userspace.
Invoke mptcp_event_pm_listener() with MPTCP_EVENT_LISTENER_CREATED in
mptcp_listen() and mptcp_pm_nl_create_listen_socket(), invoke it with
MPTCP_EVENT_LISTENER_CLOSED in __mptcp_close_ssk().
Signed-off-by: Geliang Tang <geliang.tang@...e.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
include/uapi/linux/mptcp.h | 9 ++++++
net/mptcp/pm_netlink.c | 57 ++++++++++++++++++++++++++++++++++++++
net/mptcp/protocol.c | 3 ++
net/mptcp/protocol.h | 2 ++
4 files changed, 71 insertions(+)
diff --git a/include/uapi/linux/mptcp.h b/include/uapi/linux/mptcp.h
index dfe19bf13f4c..32af2d278cb4 100644
--- a/include/uapi/linux/mptcp.h
+++ b/include/uapi/linux/mptcp.h
@@ -160,6 +160,12 @@ struct mptcp_info {
* daddr4 | daddr6, sport, dport, backup, if_idx
* [, error]
* The priority of a subflow has changed. 'error' should not be set.
+ *
+ * MPTCP_EVENT_LISTENER_CREATED: family, sport, saddr4 | saddr6
+ * A new PM listener is created.
+ *
+ * MPTCP_EVENT_LISTENER_CLOSED: family, sport, saddr4 | saddr6
+ * A PM listener is closed.
*/
enum mptcp_event_type {
MPTCP_EVENT_UNSPEC = 0,
@@ -174,6 +180,9 @@ enum mptcp_event_type {
MPTCP_EVENT_SUB_CLOSED = 11,
MPTCP_EVENT_SUB_PRIORITY = 13,
+
+ MPTCP_EVENT_LISTENER_CREATED = 15,
+ MPTCP_EVENT_LISTENER_CLOSED = 16,
};
enum mptcp_event_attr {
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index d66fbd558263..eef69d0e44ec 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1029,6 +1029,8 @@ static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
if (err)
return err;
+ mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
+
return 0;
}
@@ -2152,6 +2154,58 @@ void mptcp_event_addr_announced(const struct sock *ssk,
kfree_skb(skb);
}
+void mptcp_event_pm_listener(const struct sock *ssk,
+ enum mptcp_event_type event)
+{
+ const struct inet_sock *issk = inet_sk(ssk);
+ struct net *net = sock_net(ssk);
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+
+ if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
+ return;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb)
+ return;
+
+ nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, event);
+ if (!nlh)
+ goto nla_put_failure;
+
+ if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
+ goto nla_put_failure;
+
+ if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
+ goto nla_put_failure;
+
+ switch (ssk->sk_family) {
+ case AF_INET:
+ if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
+ goto nla_put_failure;
+ break;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ case AF_INET6: {
+ const struct ipv6_pinfo *np = inet6_sk(ssk);
+
+ if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
+ goto nla_put_failure;
+ break;
+ }
+#endif
+ default:
+ WARN_ON_ONCE(1);
+ goto nla_put_failure;
+ }
+
+ genlmsg_end(skb, nlh);
+ mptcp_nl_mcast_send(net, skb, GFP_KERNEL);
+ return;
+
+nla_put_failure:
+ kfree_skb(skb);
+}
+
void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
const struct sock *ssk, gfp_t gfp)
{
@@ -2197,6 +2251,9 @@ void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
if (mptcp_event_sub_closed(skb, msk, ssk) < 0)
goto nla_put_failure;
break;
+ case MPTCP_EVENT_LISTENER_CREATED:
+ case MPTCP_EVENT_LISTENER_CLOSED:
+ break;
}
genlmsg_end(skb, nlh);
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index b0d387be500a..f6f93957275b 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2355,6 +2355,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
tcp_set_state(ssk, TCP_CLOSE);
mptcp_subflow_queue_clean(ssk);
inet_csk_listen_stop(ssk);
+ mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CLOSED);
}
__tcp_close(ssk, 0);
@@ -3647,6 +3648,8 @@ static int mptcp_listen(struct socket *sock, int backlog)
if (!err)
mptcp_copy_inaddrs(sock->sk, ssock->sk);
+ mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
+
unlock:
release_sock(sock->sk);
return err;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 8b4379a2cd85..955fb3d88eb3 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -839,6 +839,8 @@ void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
const struct sock *ssk, gfp_t gfp);
void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info);
void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
+void mptcp_event_pm_listener(const struct sock *ssk,
+ enum mptcp_event_type event);
bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
--
2.37.2
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