OpenWrt – Rev 1

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--- /dev/null
+++ b/extensions/libxt_FLOWOFFLOAD.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter/xt_FLOWOFFLOAD.h>
+
+enum {
+    O_HW,
+};
+
+static void offload_help(void)
+{
+       printf(
+"FLOWOFFLOAD target options:\n"
+" --hw                         Enable hardware offload\n"
+       );
+}
+
+static const struct xt_option_entry offload_opts[] = {
+       {.name = "hw", .id = O_HW, .type = XTTYPE_NONE},
+       XTOPT_TABLEEND,
+};
+
+static void offload_parse(struct xt_option_call *cb)
+{
+       struct xt_flowoffload_target_info *info = cb->data;
+
+       xtables_option_parse(cb);
+       switch (cb->entry->id) {
+       case O_HW:
+               info->flags |= XT_FLOWOFFLOAD_HW;
+               break;
+       }
+}
+
+static void offload_print(const void *ip, const struct xt_entry_target *target, int numeric)
+{
+       const struct xt_flowoffload_target_info *info =
+               (const struct xt_flowoffload_target_info *)target->data;
+
+       printf(" FLOWOFFLOAD");
+       if (info->flags & XT_FLOWOFFLOAD_HW)
+               printf(" hw");
+}
+
+static void offload_save(const void *ip, const struct xt_entry_target *target)
+{
+       const struct xt_flowoffload_target_info *info =
+               (const struct xt_flowoffload_target_info *)target->data;
+
+       if (info->flags & XT_FLOWOFFLOAD_HW)
+               printf(" --hw");
+}
+
+static struct xtables_target offload_tg_reg[] = {
+       {
+               .family         = NFPROTO_UNSPEC,
+               .name           = "FLOWOFFLOAD",
+               .revision       = 0,
+               .version        = XTABLES_VERSION,
+               .size           = XT_ALIGN(sizeof(struct xt_flowoffload_target_info)),
+               .userspacesize  = sizeof(struct xt_flowoffload_target_info),
+               .help           = offload_help,
+               .print          = offload_print,
+               .save           = offload_save,
+               .x6_parse       = offload_parse,
+               .x6_options     = offload_opts,
+       },
+};
+
+void _init(void)
+{
+       xtables_register_targets(offload_tg_reg, ARRAY_SIZE(offload_tg_reg));
+}
--- /dev/null
+++ b/include/linux/netfilter/xt_FLOWOFFLOAD.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _XT_FLOWOFFLOAD_H
+#define _XT_FLOWOFFLOAD_H
+
+#include <linux/types.h>
+
+enum {
+       XT_FLOWOFFLOAD_HW       = 1 << 0,
+
+       XT_FLOWOFFLOAD_MASK     = XT_FLOWOFFLOAD_HW
+};
+
+struct xt_flowoffload_target_info {
+       __u32 flags;
+};
+
+#endif /* _XT_FLOWOFFLOAD_H */

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