mptcp: fix error handling rp_filter when kernel don't support mptcp
Summary
mptcp: fix error handling rp_filter when kernel don't support mptcp
Purpose
when the kernel don't support mptcp, NetworkManager should disable mptcp and shouldn't change rp_filter from 1 to 2, but when checking file /proc/sys/net/mptcp/enabled,val v is defined to guint32, and nm_platform_sysctl_get_int32 return -1, so v becomes a very large number and can't set mptcp_flags to NM_MPTCP_FLAGS_DISABLED.
fix #1686 (closed)
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
-
the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.