Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_repldata.h

diff --git a/kernel/net/netfilter/xt_repldata.h b/kernel/net/netfilter/xt_repldata.h
new file mode 100644 (file)
index 0000000..8fd3241
--- /dev/null
+++ b/kernel/net/netfilter/xt_repldata.h
@@ -0,0 +1,47 @@
+/*
+ * 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[].
+ */
+
+/* tbl has the following structure equivalent, but is C99 compliant:
+ * struct {
+ *     struct type##_replace repl;
+ *     struct type##_standard entries[nhooks];
+ *     struct type##_error term;
+ * } *tbl;
+ */
+
+#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[]; \
+       } *tbl; \
+       struct type##_error *term; \
+       size_t term_offset = (offsetof(typeof(*tbl), entries[nhooks]) + \
+               __alignof__(*term) - 1) & ~(__alignof__(*term) - 1); \
+       tbl = kzalloc(term_offset + sizeof(*term), GFP_KERNEL); \
+       if (tbl == NULL) \
+               return NULL; \
+       term = (struct type##_error *)&(((char *)tbl)[term_offset]); \
+       strncpy(tbl->repl.name, info->name, sizeof(tbl->repl.name)); \
+       *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; \
+})