From a147522fb664bfbfdc0289c9a12d4e05b6ffae64 Mon Sep 17 00:00:00 2001
From: jperon <cataclop@hotmail.com>
Date: Mon, 12 Aug 2024 17:54:41 +0200
Subject: [PATCH] Fix skb len calculation

Fix a bug that prevented TCP payload to be passed to lua scripts.
---
 lib/luaxtable.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/luaxtable.c b/lib/luaxtable.c
index fde50bc8..c5dde3ad 100644
--- a/lib/luaxtable.c
+++ b/lib/luaxtable.c
@@ -77,11 +77,11 @@ static inline lunatik_object_t *luaxtable_getskb(lua_State *L, luaxtable_t *xtab
 static int luaxtable_pushparams(lua_State *L, const struct xt_action_param *par, luaxtable_t *xtable, const struct sk_buff *skb, uint8_t opt)
 {
 	lunatik_object_t *data = luaxtable_getskb(L, xtable);
-	if (data == NULL) {
-		pr_err("could not find skb\n");
+	if (unlikely(data == NULL || skb_linearize(skb) != 0)) {
+		pr_err("could not get skb\n");
 		return -1;
 	}
-	luadata_reset(data, skb->data, skb_headlen(skb), opt);
+        luadata_reset(data, skb->data, skb->len, opt);
 
 	lua_newtable(L);
 	lua_pushboolean(L, par->hotdrop);