1 /* 1 /*
2 * llc_station.c - station component of LLC 2 * llc_station.c - station component of LLC
3 * 3 *
4 * Copyright (c) 1997 by Procom Technology, In 4 * Copyright (c) 1997 by Procom Technology, Inc.
5 * 2001-2003 by Arnaldo Carvalho 5 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 * 6 *
7 * This program can be redistributed or modifi 7 * This program can be redistributed or modified under the terms of the
8 * GNU General Public License as published by 8 * GNU General Public License as published by the Free Software Foundation.
9 * This program is distributed without any war 9 * This program is distributed without any warranty or implied warranty
10 * of merchantability or fitness for a particu 10 * of merchantability or fitness for a particular purpose.
11 * 11 *
12 * See the GNU General Public License for more 12 * See the GNU General Public License for more details.
13 */ 13 */
14 #include <linux/init.h> 14 #include <linux/init.h>
15 #include <linux/module.h> 15 #include <linux/module.h>
16 #include <linux/slab.h> 16 #include <linux/slab.h>
17 #include <net/llc.h> 17 #include <net/llc.h>
18 #include <net/llc_sap.h> 18 #include <net/llc_sap.h>
19 #include <net/llc_conn.h> 19 #include <net/llc_conn.h>
20 #include <net/llc_c_ac.h> 20 #include <net/llc_c_ac.h>
21 #include <net/llc_s_ac.h> 21 #include <net/llc_s_ac.h>
22 #include <net/llc_c_ev.h> 22 #include <net/llc_c_ev.h>
23 #include <net/llc_c_st.h> 23 #include <net/llc_c_st.h>
24 #include <net/llc_s_ev.h> 24 #include <net/llc_s_ev.h>
25 #include <net/llc_s_st.h> 25 #include <net/llc_s_st.h>
26 #include <net/llc_pdu.h> 26 #include <net/llc_pdu.h>
27 27
28 static int llc_stat_ev_rx_null_dsap_xid_c(stru 28 static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
29 { 29 {
30 struct llc_pdu_un *pdu = llc_pdu_un_hd 30 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
31 31
32 return LLC_PDU_IS_CMD(pdu) && 32 return LLC_PDU_IS_CMD(pdu) && /* command PDU */
33 LLC_PDU_TYPE_IS_U(pdu) && 33 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
34 LLC_U_PDU_CMD(pdu) == LLC_1_PDU 34 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID &&
35 !pdu->dsap; 35 !pdu->dsap; /* NULL DSAP value */
36 } 36 }
37 37
38 static int llc_stat_ev_rx_null_dsap_test_c(str 38 static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff *skb)
39 { 39 {
40 struct llc_pdu_un *pdu = llc_pdu_un_hd 40 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
41 41
42 return LLC_PDU_IS_CMD(pdu) && 42 return LLC_PDU_IS_CMD(pdu) && /* command PDU */
43 LLC_PDU_TYPE_IS_U(pdu) && 43 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
44 LLC_U_PDU_CMD(pdu) == LLC_1_PDU 44 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
45 !pdu->dsap; 45 !pdu->dsap; /* NULL DSAP */
46 } 46 }
47 47
48 static int llc_station_ac_send_xid_r(struct sk 48 static int llc_station_ac_send_xid_r(struct sk_buff *skb)
49 { 49 {
50 u8 mac_da[ETH_ALEN], dsap; 50 u8 mac_da[ETH_ALEN], dsap;
51 int rc = 1; 51 int rc = 1;
52 struct sk_buff *nskb = llc_alloc_frame 52 struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
53 53 sizeof(struct llc_xid_info));
54 54
55 if (!nskb) 55 if (!nskb)
56 goto out; 56 goto out;
57 llc_pdu_decode_sa(skb, mac_da); 57 llc_pdu_decode_sa(skb, mac_da);
58 llc_pdu_decode_ssap(skb, &dsap); 58 llc_pdu_decode_ssap(skb, &dsap);
59 llc_pdu_header_init(nskb, LLC_PDU_TYPE 59 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
60 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_ 60 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 127);
61 rc = llc_mac_hdr_init(nskb, skb->dev-> 61 rc = llc_mac_hdr_init(nskb, skb->dev->dev_addr, mac_da);
62 if (unlikely(rc)) 62 if (unlikely(rc))
63 goto free; 63 goto free;
64 dev_queue_xmit(nskb); 64 dev_queue_xmit(nskb);
65 out: 65 out:
66 return rc; 66 return rc;
67 free: 67 free:
68 kfree_skb(nskb); 68 kfree_skb(nskb);
69 goto out; 69 goto out;
70 } 70 }
71 71
72 static int llc_station_ac_send_test_r(struct s 72 static int llc_station_ac_send_test_r(struct sk_buff *skb)
73 { 73 {
74 u8 mac_da[ETH_ALEN], dsap; 74 u8 mac_da[ETH_ALEN], dsap;
75 int rc = 1; 75 int rc = 1;
76 u32 data_size; 76 u32 data_size;
77 struct sk_buff *nskb; 77 struct sk_buff *nskb;
78 78
79 if (skb->mac_len < ETH_HLEN) 79 if (skb->mac_len < ETH_HLEN)
80 goto out; 80 goto out;
81 81
82 /* The test request command is type U 82 /* The test request command is type U (llc_len = 3) */
83 data_size = ntohs(eth_hdr(skb)->h_prot 83 data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
84 nskb = llc_alloc_frame(NULL, skb->dev, 84 nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
85 85
86 if (!nskb) 86 if (!nskb)
87 goto out; 87 goto out;
88 llc_pdu_decode_sa(skb, mac_da); 88 llc_pdu_decode_sa(skb, mac_da);
89 llc_pdu_decode_ssap(skb, &dsap); 89 llc_pdu_decode_ssap(skb, &dsap);
90 llc_pdu_header_init(nskb, LLC_PDU_TYPE 90 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
91 llc_pdu_init_as_test_rsp(nskb, skb); 91 llc_pdu_init_as_test_rsp(nskb, skb);
92 rc = llc_mac_hdr_init(nskb, skb->dev-> 92 rc = llc_mac_hdr_init(nskb, skb->dev->dev_addr, mac_da);
93 if (unlikely(rc)) 93 if (unlikely(rc))
94 goto free; 94 goto free;
95 dev_queue_xmit(nskb); 95 dev_queue_xmit(nskb);
96 out: 96 out:
97 return rc; 97 return rc;
98 free: 98 free:
99 kfree_skb(nskb); 99 kfree_skb(nskb);
100 goto out; 100 goto out;
101 } 101 }
102 102
103 /** 103 /**
104 * llc_station_rcv - send received pdu to 104 * llc_station_rcv - send received pdu to the station state machine
105 * @skb: received frame. 105 * @skb: received frame.
106 * 106 *
107 * Sends data unit to station state machi 107 * Sends data unit to station state machine.
108 */ 108 */
109 static void llc_station_rcv(struct sk_buff *sk 109 static void llc_station_rcv(struct sk_buff *skb)
110 { 110 {
111 if (llc_stat_ev_rx_null_dsap_xid_c(skb 111 if (llc_stat_ev_rx_null_dsap_xid_c(skb))
112 llc_station_ac_send_xid_r(skb) 112 llc_station_ac_send_xid_r(skb);
113 else if (llc_stat_ev_rx_null_dsap_test 113 else if (llc_stat_ev_rx_null_dsap_test_c(skb))
114 llc_station_ac_send_test_r(skb 114 llc_station_ac_send_test_r(skb);
115 kfree_skb(skb); 115 kfree_skb(skb);
116 } 116 }
117 117
118 void __init llc_station_init(void) 118 void __init llc_station_init(void)
119 { 119 {
120 llc_set_station_handler(llc_station_rc 120 llc_set_station_handler(llc_station_rcv);
121 } 121 }
122 122
123 void llc_station_exit(void) 123 void llc_station_exit(void)
124 { 124 {
125 llc_set_station_handler(NULL); 125 llc_set_station_handler(NULL);
126 } 126 }
127 127
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