Enabled by user enabling IPv6 forwarding on any interface. This change
also enables net.ipv6.conf.all.accept_ra (=2) to accept any IPv6 route
advertisements even when acting as a router.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
These changes are based on the sysctl recommendations by Frr [1].
Not all recommendations have been incorporated, e.g., ip forwarding is
not enabled per interface, because in Infix this is an opt-in feature.
A readme.txt has been added, documenting the various settings.
New for IPv4:
- Adjust IGMP max memberships: 20 -> 1000
- Use neighbor information on nexthop selection
- Use inbound interface address on ICMP errors
- Ignore routes with link down
- Disable rp_filter
ARP settings have been changed to better fit routers, i.e., systems
with multiple interfaces:
- Always use best local address when sending ARP
- Only reply to ARP if target IP is on the inbound interface
- Generate ARP requests when device is brought up or HW address changes
New for IPv6:
- Keep static global addresses on link down
- Ignore routes with link down
Fixes#829
[1]: https://github.com/FRRouting/frr/blob/master/doc/user/Useful_Sysctl_Settings.md
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
By default, Linux will map an IP packet's TOS field into skb->priority
when acting as a router. Unfortunately this is only globally
configurable (per network namespace), which leaves us with the
following dilemma:
If we keep reclassification enabled, then a setup like this...
vlan1 vlan2
\ /
br0
/ \
e1 e2
...would likely not work as expected because any priority information
from hardware, that might be mapped to skb->priority via vlan1's
ingress-qos-map, would then be replaced by the standard TOS-mapping on
the routing boundary.
On the other hand, if we disable reclassification, then we won't be
able to source priority information from the TOS field when no other
source is available, as is the case when the source interface is a
regular NIC.
Given that the primary use-case is to run on switchdev ports, we will
most likely always have priority information available from hardware,
which is why we opt to disable the reclassification.
If this ever becomes configurable per interface, then we could open up
the configuration to let users define the policy of which layer's
priority should take precedence.
With Classic builds out of the way we can move everything back to common
again to simplify and reduce our collective cognitive overhead a bit.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This allows an application to set a larger socket receive buffer size.
The default size is left unchanged (212992). 1MB is arbitrary chosen.
The main reason for this is to allow netlink kernel sockets to
hold more interface data while user-space is processing it. Typically
useful during main configuration changes where lots of kernel side
changes occur in short period of time, such as VLAN creation.
Signed-off-by: Richard Alpe <richard@bit42.se>
The per-interface and per-af setting in the ietf-ip yang module allow
the user to enable a more granular forwarding between interfaces, which
is disabled by default.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Instead of having to rely on the kernel command line, we convert all the
kernel functionality in question into modules and rely on the auto-load
feature in the kernel and modprobe to add options at load time.
The fb_tunnels setting is a net core setting, for that we use sysctl.
This commit also syncs the kernel config between our two main archs,
disabling DRM and SOUND for the Amd64 build as a spin-off.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Joachim Wiberg