Signed-off-by: Timo Beckers <timo@isovalent.com>

For parsing v4addr into a Go type that can be assigned to with a byte slice,
the byte array needs to be the first member in the union. bpf2go picks the first
member since Go doesn't have unions. Otherwise, v4addr would become `struct
{ be32 uint32; }`, which is not very convenient nor sound in Go.

Also make sure structs embedding a v4/v6 union get zero-initialized correctly,
since having implicit padding means uninitialized memory can get passed to map
lookups which may upset the verifier.

Signed-off-by: Timo Beckers <timo@isovalent.com>

Signed-off-by: Timo Beckers <timo@isovalent.com>

…kage

dpgen imports these. If there's a bug that causes pkg/datapath/config to not
build, dpgen can't be run anymore. Turns out it's not a great idea to manage
a package you import. Move the constants to a separate package to prevent
this chicken-egg problem.

Signed-off-by: Timo Beckers <timo@isovalent.com>

If an incompatible map error occurs due to a partial rebuild or a subtle bug
with build permutations, it can be difficult to figure out where the problem
lies exactly. By dumping successful files along with the name of the incoming
map and object, this becomes much easier to troubleshoot.

```
Error: "bpf_host.o" contains map "cilium_calls" incompatible with one or more
BPF objects [bpf_alignchecker.o]: max entries mismatch: 49 != 50
```

Signed-off-by: Timo Beckers <timo@isovalent.com>

… keys

We'll need this for variables in a follow-up commit.

Signed-off-by: Timo Beckers <timo@isovalent.com>

Signed-off-by: Timo Beckers <timo@isovalent.com>

Signed-off-by: Timo Beckers <timo@isovalent.com>