Pim van Pelt f7e1bb951d Sync IPv4 and IPv6 addresses from VPP to LCP ...

There are three ways in which IP addresses will want to be copied
from VPP into the companion Linux devices:

1) set interface ip address ... adds an IPv4 or IPv6 address
  - this is handled by lcp_itf_ip[46]_add_del_interface_addr() which
    is a callback installed in lcp_itf_pair_init()
2) set interface ip address del ... removes them
  - also handled by lcp_itf_ip[46]_add_del_interface_addr() but
    curiously there is no upstream vnet_netlink_del_ip[46]_addr() so
    I wrote them inline here - I will try to get them upstreamed, as
    they appear to be obvious companions in vnet/device/netlink.h
3) Upon LIP creation, it could be that there are L3 addresses already
   on the VPP interface. If so, set them with lcp_itf_set_interface_addr()

This means that now, at any time a new LIP is created, its state from
VPP is fully copied over (MTU, Link state, IPv4/IPv6 addresses)!

At runtime, new addresses can be set/removed as well.

2021-08-13 16:50:32 +02:00

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