Merge branch 'ipv4-icmp-fix-source-ip-derivation-in-presence-of-vrfs'

Merge branch 'ipv4-icmp-fix-source-ip-derivation-in-presence-of-vrfs'

Ido Schimmel says:

====================
ipv4: icmp: Fix source IP derivation in presence of VRFs

Align IPv4 with IPv6 and in the presence of VRFs generate ICMP error
messages with a source IP that is derived from the receiving interface
and not from its VRF master. This is especially important when the error
messages are "Time Exceeded" messages as it means that utilities like
traceroute will show an incorrect packet path.

Patches #1-#2 are preparations.

Patch #3 is the actual change.

Patches #4-#7 make small improvements in the existing traceroute test.

Patch #8 extends the traceroute test with VRF test cases for both IPv4
and IPv6.

Changes since v1 [1]:
* Rebase.

[1] https://lore.kernel.org/netdev/20250901083027.183468-1-idosch@nvidia.com/
====================

Link: https://patch.msgid.link/20250908073238.119240-1-idosch@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>