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mptcp: infinite mapping receiving 

This patch adds the infinite mapping receiving logic. When the infinite
mapping is received, set the map_data_len of the subflow to 0.

In subflow_check_data_avail(), only reset the subflow when the map_data_len
of the subflow is non-zero.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2022-04-22 14:55:40 -07:00 committed by David S. Miller
parent 1e39e5a32a
commit f8d4bcacff
1 changed files with 3 additions and 1 deletions
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4
net/mptcp/subflow.c
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@ -1006,7 +1006,9 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
data_len = mpext->data_len;
if (data_len == 0) {
pr_debug("infinite mapping received");
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_INFINITEMAPRX);
subflow->map_data_len = 0;
return MAPPING_INVALID;
}
@ -1220,7 +1222,7 @@ static bool subflow_check_data_avail(struct sock *ssk)
return true;
}
if (subflow->mp_join || subflow->fully_established) {
if ((subflow->mp_join || subflow->fully_established) && subflow->map_data_len) {
/* fatal protocol error, close the socket.
* subflow_error_report() will introduce the appropriate barriers
*/