This work based on Tom's original patch
teg@1312172
By setting GatewayOnlink=yes, the kernel will assume that the gateway is onlink
even if there is no route to it.
Resolves issue #1283.
Now we track the sections for example [Address] via line number.
Which was fine till we din't had dropins dir. If we have multiple
sections which have the ideantical line number in diffrent files
we are overwriting these since line number is the key.
This patch fixes this by taking filename and line number as key.
This fixes [Address] and [Route] section overwriting.
fixes: #5141
It is just an alias for route_free which requires that route is not null,
but it was only used in one place where it was checked that route is not
null anyway. Let's just call route_free instead.
networkd: add support to set route table
1. add support to configure the table id.
if id is less than 256 we can fit this in the header of route as
netlink property is a char. But in kernel this proepty is a
unsigned 32. Hence if greater that 256 add this as RTA_TABLE
attribute.
2. we are not setting the address family now. Now set this property.
Header files were organized in a way where the includer would add various
typedefs used by the includee before including it, resulting in a tangled
web of dependencies between files.
Replace this with the following logic:
networkd.h
/ \
networkd-link.h \
networkd-ipv4ll.h--\__\
networkd-fdb.h \
networkd-network.h netword-netdev-*.h
networkd-route.h \
networkd-netdev.h
If a pointer to a structure defined in a different header file is needed,
use a typedef line instead of including the whole header.
Router Discovery is a core part of IPv6, which by default is handled by the kernel.
However, the kernel implementation is meant as a fall-back, and to fully support
the protocol a userspace implementation is desired.
The protocol essentially listens for Router Advertisement packets from routers
on the local link and use these to configure the client automatically. The four
main pieces of information are: what kind (if any) of DHCPv6 configuration should
be performed; a default gateway; the prefixes that should be considered to be on
the local link; and the prefixes with which we can preform SLAAC in order to pick
a global IPv6 address.
A lot of additional information is also available, which we do not yet fully
support, but which will eventually allow us to avoid the need for DHCPv6 in the
common case.
Short-term, the reason for wanting this is in userspace was the desire to fully
track all the addresses on links we manage, and that is not possible for addresses
managed by the kernel (as the kernel does not expose to us the fact that it
manages these addresses). Moreover, we would like to support stable privacy
addresses, which will soon be mandated and the legacy MAC-based global addresses
deprecated, to do this well we need to handle the generation in userspace. Lastly,
more long-term we wish to support more RA options than what the kernel exposes.
This should really live in the kernel, but the netlink API currently
does not support it. Until support has been added, expire the route
from userspace.
