Commit | Line | Data |
---|---|---|
e3eaa991 JE |
1 | /* |
2 | * Today's hack: quantum tunneling in structs | |
3 | * | |
4 | * 'entries' and 'term' are never anywhere referenced by word in code. In fact, | |
5 | * they serve as the hanging-off data accessed through repl.data[]. | |
6 | */ | |
7 | ||
8 | #define xt_alloc_initial_table(type, typ2) ({ \ | |
9 | unsigned int hook_mask = info->valid_hooks; \ | |
10 | unsigned int nhooks = hweight32(hook_mask); \ | |
11 | unsigned int bytes = 0, hooknum = 0, i = 0; \ | |
12 | struct { \ | |
13 | struct type##_replace repl; \ | |
14 | struct type##_standard entries[nhooks]; \ | |
15 | struct type##_error term; \ | |
16 | } *tbl = kzalloc(sizeof(*tbl), GFP_KERNEL); \ | |
17 | if (tbl == NULL) \ | |
18 | return NULL; \ | |
19 | strncpy(tbl->repl.name, info->name, sizeof(tbl->repl.name)); \ | |
20 | tbl->term = (struct type##_error)typ2##_ERROR_INIT; \ | |
21 | tbl->repl.valid_hooks = hook_mask; \ | |
22 | tbl->repl.num_entries = nhooks + 1; \ | |
23 | tbl->repl.size = nhooks * sizeof(struct type##_standard) + \ | |
24 | sizeof(struct type##_error); \ | |
25 | for (; hook_mask != 0; hook_mask >>= 1, ++hooknum) { \ | |
26 | if (!(hook_mask & 1)) \ | |
27 | continue; \ | |
28 | tbl->repl.hook_entry[hooknum] = bytes; \ | |
29 | tbl->repl.underflow[hooknum] = bytes; \ | |
30 | tbl->entries[i++] = (struct type##_standard) \ | |
31 | typ2##_STANDARD_INIT(NF_ACCEPT); \ | |
32 | bytes += sizeof(struct type##_standard); \ | |
33 | } \ | |
34 | tbl; \ | |
35 | }) |