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Date: Fri, 8 Jan 2021 16:47:57 -0800
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: Geliang Tang <geliangtang@...il.com>, davem@...emloft.net,
kuba@...nel.org, mptcp@...ts.01.org,
Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 3/8] mptcp: add the outgoing MP_PRIO support
From: Geliang Tang <geliangtang@...il.com>
This patch added the outgoing MP_PRIO logic:
In mptcp_pm_nl_mp_prio_send_ack, find the related subflow and subsocket
according to the input parameter addr. Save the input priority value to
suflow's backup, then set subflow's send_mp_prio flag to true, and save
the input priority value to suflow's request_bkup. Finally, send out a
pure ACK on the related subsocket.
In mptcp_established_options_mp_prio, check whether the subflow's
send_mp_prio is set. If it is, this is the packet for sending MP_PRIO.
So save subflow->request_bkup value to mptcp_out_options's backup, and
change the option type to OPTION_MPTCP_PRIO.
In mptcp_write_options, clear the send_mp_prio flag and send out the
MP_PRIO suboption with mptcp_out_options's backup value.
Signed-off-by: Geliang Tang <geliangtang@...il.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
net/mptcp/options.c | 40 ++++++++++++++++++++++++++++++++++++++++
net/mptcp/pm_netlink.c | 33 +++++++++++++++++++++++++++++++++
net/mptcp/protocol.h | 6 ++++++
3 files changed, 79 insertions(+)
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index e0d21c0607e5..ef50a8628d77 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -679,6 +679,28 @@ static bool mptcp_established_options_rm_addr(struct sock *sk,
return true;
}
+static bool mptcp_established_options_mp_prio(struct sock *sk,
+ unsigned int *size,
+ unsigned int remaining,
+ struct mptcp_out_options *opts)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+
+ if (!subflow->send_mp_prio)
+ return false;
+
+ if (remaining < TCPOLEN_MPTCP_PRIO)
+ return false;
+
+ *size = TCPOLEN_MPTCP_PRIO;
+ opts->suboptions |= OPTION_MPTCP_PRIO;
+ opts->backup = subflow->request_bkup;
+
+ pr_debug("prio=%d", opts->backup);
+
+ return true;
+}
+
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
unsigned int *size, unsigned int remaining,
struct mptcp_out_options *opts)
@@ -721,6 +743,12 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
ret = true;
}
+ if (mptcp_established_options_mp_prio(sk, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ ret = true;
+ }
+
return ret;
}
@@ -1168,6 +1196,18 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
0, opts->rm_id);
}
+ if (OPTION_MPTCP_PRIO & opts->suboptions) {
+ const struct sock *ssk = (const struct sock *)tp;
+ struct mptcp_subflow_context *subflow;
+
+ subflow = mptcp_subflow_ctx(ssk);
+ subflow->send_mp_prio = 0;
+
+ *ptr++ = mptcp_option(MPTCPOPT_MP_PRIO,
+ TCPOLEN_MPTCP_PRIO,
+ opts->backup, TCPOPT_NOP);
+ }
+
if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) {
*ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
TCPOLEN_MPTCP_MPJ_SYN,
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 7fe7be4eef7e..bf0d13c85a68 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -442,6 +442,39 @@ void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk)
}
}
+int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
+ struct mptcp_addr_info *addr,
+ u8 bkup)
+{
+ struct mptcp_subflow_context *subflow;
+
+ pr_debug("bkup=%d", bkup);
+
+ mptcp_for_each_subflow(msk, subflow) {
+ struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+ struct mptcp_addr_info local;
+
+ local_address((struct sock_common *)ssk, &local);
+ if (!addresses_equal(&local, addr, addr->port))
+ continue;
+
+ subflow->backup = bkup;
+ subflow->send_mp_prio = 1;
+ subflow->request_bkup = bkup;
+
+ spin_unlock_bh(&msk->pm.lock);
+ pr_debug("send ack for mp_prio");
+ lock_sock(ssk);
+ tcp_send_ack(ssk);
+ release_sock(ssk);
+ spin_lock_bh(&msk->pm.lock);
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)
{
struct mptcp_subflow_context *subflow, *tmp;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index d67de793d363..21763e00d990 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -24,6 +24,7 @@
#define OPTION_MPTCP_ADD_ADDR6 BIT(7)
#define OPTION_MPTCP_RM_ADDR BIT(8)
#define OPTION_MPTCP_FASTCLOSE BIT(9)
+#define OPTION_MPTCP_PRIO BIT(10)
/* MPTCP option subtypes */
#define MPTCPOPT_MP_CAPABLE 0
@@ -59,6 +60,7 @@
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
#define TCPOLEN_MPTCP_PORT_LEN 4
#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
+#define TCPOLEN_MPTCP_PRIO 4
#define TCPOLEN_MPTCP_FASTCLOSE 12
/* MPTCP MP_JOIN flags */
@@ -396,6 +398,7 @@ struct mptcp_subflow_context {
map_valid : 1,
mpc_map : 1,
backup : 1,
+ send_mp_prio : 1,
rx_eof : 1,
can_ack : 1, /* only after processing the remote a key */
disposable : 1; /* ctx can be free at ulp release time */
@@ -550,6 +553,9 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr);
void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
+int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
+ struct mptcp_addr_info *addr,
+ u8 bkup);
void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
struct mptcp_pm_add_entry *
mptcp_pm_del_add_timer(struct mptcp_sock *msk,
--
2.30.0
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