[LLC]: Make llc_frame_alloc take a net_device as an argument

So as to set the newly created sk_buff ->dev member with it, that way we stop
using dev_base->next, that is the wrong thing to do, as there may well be
several interfaces being used with LLC. This was not such a big problem after
all as most of the users of llc_alloc_frame were setting the correct dev, but
this way code is reduced.

This also fixes another bug in llc_station_ac_send_null_dsap_xid_c, that was
not setting the skb->dev field.

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

4 files changed, 50 insertions, 74 deletions

diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index b218be4c10e..db98ea2113a 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -217,13 +217,12 @@ int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_disc_cmd(nskb, 1);
@@ -243,14 +242,13 @@ free:
 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit;
 
-		nskb->dev = llc->dev;
 		llc_pdu_decode_pf_bit(skb, &f_bit);
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
@@ -270,14 +268,13 @@ free:
 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_dm_rsp(nskb, f_bit);
@@ -306,11 +303,10 @@ int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
 		llc_pdu_decode_pf_bit(skb, &f_bit);
 	else
 		f_bit = 0;
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(llc->dev);
 	if (nskb) {
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
@@ -330,15 +326,14 @@ free:
 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
 		u8 f_bit = 0;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
@@ -360,15 +355,14 @@ int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 	u8 f_bit;
 	int rc = -ENOBUFS;
 	struct sk_buff *nskb;
+	struct llc_sock *llc = llc_sk(sk);
 
 	llc_pdu_decode_pf_bit(skb, &f_bit);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(llc->dev);
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
@@ -451,13 +445,12 @@ int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
 	u8 nr;
 	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
@@ -487,13 +480,12 @@ int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
@@ -512,14 +504,13 @@ free:
 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
 		u8 f_bit = 1;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
@@ -538,14 +529,13 @@ free:
 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 0;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
@@ -564,13 +554,12 @@ free:
 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
@@ -589,14 +578,13 @@ free:
 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
@@ -615,14 +603,13 @@ free:
 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
 		u8 f_bit = 0;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
@@ -653,13 +640,12 @@ int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
@@ -678,13 +664,12 @@ free:
 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
@@ -703,14 +688,13 @@ free:
 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
@@ -729,14 +713,13 @@ free:
 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
@@ -755,13 +738,12 @@ free:
 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
@@ -780,13 +762,12 @@ free:
 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
@@ -815,8 +796,8 @@ void llc_conn_set_p_flag(struct sock *sk, u8 value)
 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
 	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
 		struct llc_sap *sap = llc->sap;
@@ -824,7 +805,6 @@ int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 
 		if (llc->dev->flags & IFF_LOOPBACK)
 			dmac = llc->dev->dev_addr;
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_sabme_cmd(nskb, 1);
@@ -845,11 +825,11 @@ int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 {
 	u8 f_bit;
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	llc_pdu_decode_pf_bit(skb, &f_bit);
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
 		nskb->dev = llc->dev;
@@ -1001,13 +981,12 @@ static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
 					       struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
diff --git a/net/llc/llc_s_ac.c b/net/llc/llc_s_ac.c
index ed8ba7de612..270b2f2030c 100644
--- a/net/llc/llc_s_ac.c
+++ b/net/llc/llc_s_ac.c
@@ -103,10 +103,9 @@ int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_da(skb, mac_sa);
 	llc_pdu_decode_ssap(skb, &dsap);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(skb->dev);
 	if (!nskb)
 		goto out;
-	nskb->dev = skb->dev;
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
 			    LLC_PDU_RSP);
 	llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0);
@@ -149,10 +148,9 @@ int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_da(skb, mac_sa);
 	llc_pdu_decode_ssap(skb, &dsap);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(skb->dev);
 	if (!nskb)
 		goto out;
-	nskb->dev = skb->dev;
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
 			    LLC_PDU_RSP);
 	llc_pdu_init_as_test_rsp(nskb, skb);
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 34228ef1498..0adaa289bf0 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -26,11 +26,12 @@
 
 /**
  *	llc_alloc_frame - allocates sk_buff for frame
+ *	@dev: network device this skb will be sent over
  *
  *	Allocates an sk_buff for frame and initializes sk_buff fields.
  *	Returns allocated skb or %NULL when out of memory.
  */
-struct sk_buff *llc_alloc_frame(void)
+struct sk_buff *llc_alloc_frame(struct net_device *dev)
 {
 	struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
 
@@ -38,7 +39,7 @@ struct sk_buff *llc_alloc_frame(void)
 		skb_reserve(skb, 50);
 		skb->nh.raw   = skb->h.raw = skb->data;
 		skb->protocol = htons(ETH_P_802_2);
-		skb->dev      = dev_base->next;
+		skb->dev      = dev;
 		skb->mac.raw  = skb->head;
 	}
 	return skb;
diff --git a/net/llc/llc_station.c b/net/llc/llc_station.c
index 8fe48a24bad..85a7ac27614 100644
--- a/net/llc/llc_station.c
+++ b/net/llc/llc_station.c
@@ -249,7 +249,7 @@ static int llc_station_ac_inc_xid_r_cnt_by_1(struct sk_buff *skb)
 static int llc_station_ac_send_null_dsap_xid_c(struct sk_buff *skb)
 {
 	int rc = 1;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct sk_buff *nskb = llc_alloc_frame(skb->dev);
 
 	if (!nskb)
 		goto out;
@@ -270,12 +270,11 @@ static int llc_station_ac_send_xid_r(struct sk_buff *skb)
 {
 	u8 mac_da[ETH_ALEN], dsap;
 	int rc = 1;
-	struct sk_buff* nskb = llc_alloc_frame();
+	struct sk_buff* nskb = llc_alloc_frame(skb->dev);
 
 	if (!nskb)
 		goto out;
 	rc = 0;
-	nskb->dev = skb->dev;
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_ssap(skb, &dsap);
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
@@ -295,12 +294,11 @@ static int llc_station_ac_send_test_r(struct sk_buff *skb)
 {
 	u8 mac_da[ETH_ALEN], dsap;
 	int rc = 1;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct sk_buff *nskb = llc_alloc_frame(skb->dev);
 
 	if (!nskb)
 		goto out;
 	rc = 0;
-	nskb->dev = skb->dev;
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_ssap(skb, &dsap);
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);