Recent merge of cert-v2 support introduced the ability to tunnel IPv6. However, FreeBSD's IPv6 tunneling does not work for 2 reasons:
* The ifconfig commands did not work for IPv6 addresses
* The tunnel device was not configured for link-layer mode, so it only supported IPv4
This PR improves FreeBSD tunneling support in 3 ways:
* Use ioctl instead of exec'ing ifconfig to configure the interface, with additional logic to support IPv6
* Configure the tunnel in link-layer mode, allowing IPv6 traffic
* Use readv() and writev() to communicate with the tunnel device, to avoid the need to copy the packet buffer
We switched to yaml.v3 with #1148, but missed this spot that was still
casting into `map[any]any` when yaml.v3 makes it `map[string]any`. Also
clean up a few more `interface{}` that were added as we changed them all
to `any` with #1148.
* upgrade to yaml.v3
The main nice fix here is that maps unmarshal into `map[string]any`
instead of `map[any]any`, so it cleans things up a bit.
* add config.AsBool
Since yaml.v3 doesn't automatically convert yes to bool now, for
backwards compat
* use type aliases for m
* more cleanup
* more cleanup
* more cleanup
* go mod cleanup
* firewall: add option to send REJECT replies
This change allows you to configure the firewall to send REJECT packets
when a packet is denied.
firewall:
# Action to take when a packet is not allowed by the firewall rules.
# Can be one of:
# `drop` (default): silently drop the packet.
# `reject`: send a reject reply.
# - For TCP, this will be a RST "Connection Reset" packet.
# - For other protocols, this will be an ICMP port unreachable packet.
outbound_action: drop
inbound_action: drop
These packets are only sent to established tunnels, and only on the
overlay network (currently IPv4 only).
$ ping -c1 192.168.100.3
PING 192.168.100.3 (192.168.100.3) 56(84) bytes of data.
From 192.168.100.3 icmp_seq=2 Destination Port Unreachable
--- 192.168.100.3 ping statistics ---
2 packets transmitted, 0 received, +1 errors, 100% packet loss, time 31ms
$ nc -nzv 192.168.100.3 22
(UNKNOWN) [192.168.100.3] 22 (?) : Connection refused
This change also modifies the smoke test to capture tcpdump pcaps from
both the inside and outside to inspect what is going on over the wire.
It also now does TCP and UDP packet tests using the Nmap version of
ncat.
* calculate seq and ack the same was as the kernel
The logic a bit confusing, so we copy it straight from how the kernel
does iptables `--reject-with tcp-reset`:
- https://github.com/torvalds/linux/blob/v5.19/net/ipv4/netfilter/nf_reject_ipv4.c#L193-L221
* cleanup
