mptcp: add the incoming MP_PRIO support
This patch added the incoming MP_PRIO logic:
Added a flag named mp_prio in struct mptcp_options_received, to mark the
MP_PRIO is received, and save the priority value to struct
mptcp_options_received's backup member. Then invoke
mptcp_pm_mp_prio_received with the receiving subsocket and the backup
value.
In mptcp_pm_mp_prio_received, get the subflow context according the input
subsocket, and change the subflow's backup as the incoming priority value.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index ef50a86..adfa96d 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -282,6 +282,15 @@ static void mptcp_parse_option(const struct sk_buff *skb,
pr_debug("RM_ADDR: id=%d", mp_opt->rm_id);
break;
+ case MPTCPOPT_MP_PRIO:
+ if (opsize != TCPOLEN_MPTCP_PRIO)
+ break;
+
+ mp_opt->mp_prio = 1;
+ mp_opt->backup = *ptr++ & MPTCP_PRIO_BKUP;
+ pr_debug("MP_PRIO: prio=%d", mp_opt->backup);
+ break;
+
case MPTCPOPT_MP_FASTCLOSE:
if (opsize != TCPOLEN_MPTCP_FASTCLOSE)
break;
@@ -313,6 +322,7 @@ void mptcp_get_options(const struct sk_buff *skb,
mp_opt->port = 0;
mp_opt->rm_addr = 0;
mp_opt->dss = 0;
+ mp_opt->mp_prio = 0;
length = (th->doff * 4) - sizeof(struct tcphdr);
ptr = (const unsigned char *)(th + 1);
@@ -1022,6 +1032,11 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
mp_opt.rm_addr = 0;
}
+ if (mp_opt.mp_prio) {
+ mptcp_pm_mp_prio_received(sk, mp_opt.backup);
+ mp_opt.mp_prio = 0;
+ }
+
if (!mp_opt.dss)
return;