add sourcefilter option support for most protocol

[ptpt52]

this add sourcefilter support for protocol:

ppp
ncm
mbim
qmi

the source based IPv6 routing option should be available like DHCPv6

[ptpt52]

luci related PR https://github.com/openwrt/luci/pull/6864

[ptpt52]

update: sourcefilter option support for listed proto

    'dhcpv6'
    'directip'
    'ppp'
    'pppoe'
    'pppoa'
    'pptp'
    'qmi'
    'mbim'
    'ncm'

[feckert]

Does this also apply to the proto modemmanger in the packages feed?

[ptpt52]

related issue https://github.com/openwrt/openwrt/issues/14954

[ptpt52]

Does this also apply to the proto modemmanger in the packages feed?

It should but not handled here

[ptpt52]

ping @981213

[981213]

Merged. Thanks!

[feckert]

@ptpt52 As I mentioned above, we should also implement this for the protos that are in the package feeds.