HOOK_VERSION
ins->ipdn_v4in = hook_alloc(HOOK_VERSION);
ins->ipdn_v4out = hook_alloc(HOOK_VERSION);
ins->ipdn_v6in = hook_alloc(HOOK_VERSION);
ins->ipdn_v6out = hook_alloc(HOOK_VERSION);
(x)->hf_version = HOOK_VERSION; \
(x)->he_version = HOOK_VERSION; \
(x) = hook_alloc(HOOK_VERSION); \