feat(network): Add IPv6 support

[Gelbpunkt]

This adds support for specifying IPv6 addresses in the ip= parameter and wires it up to the interface configuration. With these changes, we can reach a Hermit VM over IPv6. However, since our test setup is currently based on the assumption that many of the tests only perform e.g. a single HTTP request, test coverage is quite lackluster. The loopback example can trivially be adjusted to test both IPv4 and IPv6.

Loopback example change: hermit-os/hermit-rs#1089

[github-actions]

Benchmark Results

Details

Benchmark	Current: 425751b	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	90.96 s	80.34 s	1.13 ❗
startup_benchmark File Size	0.79 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.77 s (±0.02 s)	0.75 s (±0.02 s)	1.03
Startup Time - 2 cores	0.78 s (±0.02 s)	0.74 s (±0.02 s)	1.06 ❗
Startup Time - 4 cores	0.77 s (±0.02 s)	0.74 s (±0.02 s)	1.04 ❗
multithreaded_benchmark Build Time	90.50 s	82.11 s	1.10 ❗
multithreaded_benchmark File Size	0.85 MB	0.86 MB	0.99 ❗
Multithreaded Pi Efficiency - 2 Threads	89.84 % (±9.07 %)	85.89 % (±6.61 %)	1.05
Multithreaded Pi Efficiency - 4 Threads	44.83 % (±3.83 %)	43.43 % (±2.56 %)	1.03
Multithreaded Pi Efficiency - 8 Threads	25.63 % (±1.61 %)	25.76 % (±1.53 %)	1.00
micro_benchmarks Build Time	85.99 s	80.40 s	1.07 ❗
micro_benchmarks File Size	0.86 MB	0.86 MB	0.99 ❗
Scheduling time - 1 thread	65.27 ticks (±2.38 ticks)	62.65 ticks (±4.06 ticks)	1.04
Scheduling time - 2 threads	38.72 ticks (±6.23 ticks)	34.08 ticks (±4.10 ticks)	1.14
Micro - Time for syscall (getpid)	3.49 ticks (±0.60 ticks)	3.45 ticks (±0.58 ticks)	1.01
Memcpy speed - (built_in) block size 4096	78560.89 MByte/s (±54475.04 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.95
Memcpy speed - (built_in) block size 1048576	29535.48 MByte/s (±23947.48 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.97
Memcpy speed - (built_in) block size 16777216	27708.67 MByte/s (±22803.81 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.05
Memset speed - (built_in) block size 4096	78364.91 MByte/s (±54333.43 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.95
Memset speed - (built_in) block size 1048576	30268.37 MByte/s (±24377.94 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.97
Memset speed - (built_in) block size 16777216	28448.61 MByte/s (±23235.99 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.05
Memcpy speed - (rust) block size 4096	70860.40 MByte/s (±49618.40 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	0.96
Memcpy speed - (rust) block size 1048576	29398.54 MByte/s (±23936.41 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.97
Memcpy speed - (rust) block size 16777216	27403.97 MByte/s (±22541.39 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.99
Memset speed - (rust) block size 4096	71187.57 MByte/s (±49876.35 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	0.96
Memset speed - (rust) block size 1048576	30115.73 MByte/s (±24355.58 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.97
Memset speed - (rust) block size 16777216	28130.17 MByte/s (±22964.31 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.99
alloc_benchmarks Build Time	86.18 s	74.76 s	1.15 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
Allocations - Allocation success	91.38 %	91.31 %	1.00 ❗
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.60 %	61.44 %	1.00 ❗
Allocations - Average Allocation time	11753.34 Ticks (±209.06 Ticks)	5860.58 Ticks (±98.43 Ticks)	2.01 ❗
Allocations - Average Allocation time (no fail)	12324.33 Ticks (±286.27 Ticks)	6554.81 Ticks (±92.86 Ticks)	1.88 ❗
Allocations - Average Deallocation time	3278.98 Ticks (±905.62 Ticks)	1805.01 Ticks (±250.35 Ticks)	1.82 ❗
mutex_benchmark Build Time	83.87 s	79.82 s	1.05 ❗
mutex_benchmark File Size	0.86 MB	0.86 MB	0.99 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.82 ns (±0.52 ns)	12.10 ns (±0.41 ns)	1.06 ❗
Mutex Stress Test Average Time per Iteration - 2 Threads	87.70 ns (±3.26 ns)	40.26 ns (±1.68 ns)	2.18 ❗

This comment was automatically generated by workflow using github-action-benchmark.

[mkroening]

Thanks, this is great! :)

[mkroening]

Where does this address come from? Is this derived from the default MAC address? We should specify in a comment how to change this if a different MAC address is set via the QEMU cmdline.

[Gelbpunkt]

This is just the first subnet that https://www.unique-local-ipv6.com/ output for me :D

[mkroening]

I see. So this is the same address that is also hardcoded in xtask. How does this address relate to the Hermit-generated link-local address? :)

[Gelbpunkt]

This is a ULA (unique local address) in the fc00::/7 subnet which is destined for addresses only reachable in private networks. It's kind of the IPv6 equivalent to the IPv4 private networks like 10.0.0.0/8, which was being used for IPv4.

The link-local addresses are in the subnet of fe80::/10 and only reachable on a local link (and also ignored by routers).

[mkroening]

Thanks you so much! :)

[mkroening]

I merged hermit-os/hermit-rs#1089 first, to test it here.