fixup! add XDPLua

Author: VictorNogueiraRio

net/core/filter.c

@@ -4859,15 +4859,16 @@ BPF_CALL_4(bpf_lua_pcall, struct xdp_buff *, ctx, char *, funcname,
 		goto clean_state;
 	}
 
-	lua_insert(ctx->L, 1);
+	lua_insert(ctx->L, base + 1);
 	if (lua_pcall(ctx->L, num_args, num_rets, 0)) {
 		pr_err("%s\n", lua_tostring(ctx->L, -1));
 		num_rets = 0;
 		goto clean_state;
 	}
 
-clean_state:
 	base += num_rets;
+
+clean_state:
 	lua_settop(ctx->L, base);
 	return num_rets;
 }

samples/bpf/xdplua_user.c

@@ -81,7 +81,7 @@ static int do_attach_lua(const char *name, char *lua_prog)
 {
 	int err;
 
-	err = bpf_set_link_xdp_lua_prog(lua_prog, 0);
+	err = bpf_set_link_xdp_lua_prog(lua_prog);
 	if (err < 0)
 		fprintf(stderr, "ERROR: failed to attach lua script to %s\n", name);
 

tools/lib/bpf/bpf.c

@@ -643,7 +643,7 @@ int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
 }
 
 /* #ifdef CONFIG_XDPLUA */
-int bpf_set_link_xdp_lua_prog(char *lua_prog, __u32 flags)
+int bpf_set_link_xdp_lua_prog(char *lua_prog)
 {
 	struct sockaddr_nl sa;
 	int sock, seq = 0, len, ret = -1;
@@ -715,15 +715,6 @@ int bpf_set_link_xdp_lua_prog(char *lua_prog, __u32 flags)
 	}
 	nla->nla_len += nla_xdp->nla_len;
 
-	/* if user passed in any flags, add those too */
-	if (flags) {
-		nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
-		nla_xdp->nla_type = IFLA_XDP_FLAGS;
-		nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags);
-		memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags));
-		nla->nla_len += nla_xdp->nla_len;
-	}
-
 	req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
 
 	if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {

tools/lib/bpf/libbpf.h

@@ -285,7 +285,7 @@ int bpf_prog_load(const char *file, enum bpf_prog_type type,
 
 int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
 /* #ifdef CONFIG_XDP_LUA */
-int bpf_set_link_xdp_lua_prog(char *lua_prog, __u32 flags);
+int bpf_set_link_xdp_lua_prog(char *lua_prog);
 /* #endif CONFIG_XDP_LUA */
 
 enum bpf_perf_event_ret {