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authorDavid Gwynne <dlg@cvs.openbsd.org>2019-01-23 23:08:39 +0000
committerDavid Gwynne <dlg@cvs.openbsd.org>2019-01-23 23:08:39 +0000
commit5a4bf8b3547bae0e56ab27cbe970b3da4a5f0e72 (patch)
treedf8c2f138cae00eb061c717b12929181818f5ec7 /usr.sbin/snmpd
parent32229ab68967ba7a664f364ac7705625332ac9c2 (diff)
rework mpw to be an actual ethernet interface.
this will allow for a lot of special casing in places like vlan and bridge to go away since mpw will do all the same things as any other ethernet tunnel. another benefit is you can run stuff directly on the mpw interface to interact with the pseudowire, rather than requiring a bridge and vether interface. this is like what juniper calls Pseudowire Service Interfaces. the caveat is that the implicit vlan or svlan tagging that mpw did in ethernet-tagged mode now has to be done by hand. however, there is some indication that different vendors pick different types of tags, ie, one uses vlan tags and another uses svlan, so being able to configure the right one has value. it is also possible you would want to bridge the entire tag stack to another site, so being able to bridge mpw without it playing with the tags can be useful. because the if_type on mpw changes from IFT_MPLSTUNNEL to IFT_ETHER, the semantic used to handle incoming packets in mpls_input is changed. instead of mpls_input pushing the packets into mpw based on the if_type being IFT_MPLSTUNNEL, mpw now adds an RTF_LOCAL route to the mpls table. mpls_input falls through to "outputting" the packet to mpw_output, which then uses the RTF_LOCAL flag to decide to input to mpw_input and then ether_input. this semantic will be applied to mpe soon, which removes all the interface special casing in mpls_input. the if_type change also means mpw implements the SIOCGPWE3 ioctl so ldpd can still figure out that the interface is a pseudowire. ok claudio@
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