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- /*
- * Today's hack: quantum tunneling in structs
- *
- * 'entries' and 'term' are never anywhere referenced by word in code. In fact,
- * they serve as the hanging-off data accessed through repl.data[].
- */
- #define xt_alloc_initial_table(type, typ2) ({ \
- unsigned int hook_mask = info->valid_hooks; \
- unsigned int nhooks = hweight32(hook_mask); \
- unsigned int bytes = 0, hooknum = 0, i = 0; \
- struct { \
- struct type##_replace repl; \
- struct type##_standard entries[nhooks]; \
- struct type##_error term; \
- } *tbl = kzalloc(sizeof(*tbl), GFP_KERNEL); \
- if (tbl == NULL) \
- return NULL; \
- strncpy(tbl->repl.name, info->name, sizeof(tbl->repl.name)); \
- tbl->term = (struct type##_error)typ2##_ERROR_INIT; \
- tbl->repl.valid_hooks = hook_mask; \
- tbl->repl.num_entries = nhooks + 1; \
- tbl->repl.size = nhooks * sizeof(struct type##_standard) + \
- sizeof(struct type##_error); \
- for (; hook_mask != 0; hook_mask >>= 1, ++hooknum) { \
- if (!(hook_mask & 1)) \
- continue; \
- tbl->repl.hook_entry[hooknum] = bytes; \
- tbl->repl.underflow[hooknum] = bytes; \
- tbl->entries[i++] = (struct type##_standard) \
- typ2##_STANDARD_INIT(NF_ACCEPT); \
- bytes += sizeof(struct type##_standard); \
- } \
- tbl; \
- })
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