This source file includes following definitions.
- llc_stat_ev_rx_null_dsap_xid_c
- llc_stat_ev_rx_null_dsap_test_c
- llc_station_ac_send_xid_r
- llc_station_ac_send_test_r
- llc_station_rcv
- llc_station_init
- llc_station_exit
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14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <net/llc.h>
18 #include <net/llc_sap.h>
19 #include <net/llc_conn.h>
20 #include <net/llc_c_ac.h>
21 #include <net/llc_s_ac.h>
22 #include <net/llc_c_ev.h>
23 #include <net/llc_c_st.h>
24 #include <net/llc_s_ev.h>
25 #include <net/llc_s_st.h>
26 #include <net/llc_pdu.h>
27
28 static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
29 {
30 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
31
32 return LLC_PDU_IS_CMD(pdu) &&
33 LLC_PDU_TYPE_IS_U(pdu) &&
34 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID &&
35 !pdu->dsap;
36 }
37
38 static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff *skb)
39 {
40 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
41
42 return LLC_PDU_IS_CMD(pdu) &&
43 LLC_PDU_TYPE_IS_U(pdu) &&
44 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
45 !pdu->dsap;
46 }
47
48 static int llc_station_ac_send_xid_r(struct sk_buff *skb)
49 {
50 u8 mac_da[ETH_ALEN], dsap;
51 int rc = 1;
52 struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
53 sizeof(struct llc_xid_info));
54
55 if (!nskb)
56 goto out;
57 rc = 0;
58 llc_pdu_decode_sa(skb, mac_da);
59 llc_pdu_decode_ssap(skb, &dsap);
60 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
61 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 127);
62 rc = llc_mac_hdr_init(nskb, skb->dev->dev_addr, mac_da);
63 if (unlikely(rc))
64 goto free;
65 dev_queue_xmit(nskb);
66 out:
67 return rc;
68 free:
69 kfree_skb(nskb);
70 goto out;
71 }
72
73 static int llc_station_ac_send_test_r(struct sk_buff *skb)
74 {
75 u8 mac_da[ETH_ALEN], dsap;
76 int rc = 1;
77 u32 data_size;
78 struct sk_buff *nskb;
79
80
81 data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
82 nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
83
84 if (!nskb)
85 goto out;
86 rc = 0;
87 llc_pdu_decode_sa(skb, mac_da);
88 llc_pdu_decode_ssap(skb, &dsap);
89 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
90 llc_pdu_init_as_test_rsp(nskb, skb);
91 rc = llc_mac_hdr_init(nskb, skb->dev->dev_addr, mac_da);
92 if (unlikely(rc))
93 goto free;
94 dev_queue_xmit(nskb);
95 out:
96 return rc;
97 free:
98 kfree_skb(nskb);
99 goto out;
100 }
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108 static void llc_station_rcv(struct sk_buff *skb)
109 {
110 if (llc_stat_ev_rx_null_dsap_xid_c(skb))
111 llc_station_ac_send_xid_r(skb);
112 else if (llc_stat_ev_rx_null_dsap_test_c(skb))
113 llc_station_ac_send_test_r(skb);
114 kfree_skb(skb);
115 }
116
117 void __init llc_station_init(void)
118 {
119 llc_set_station_handler(llc_station_rcv);
120 }
121
122 void llc_station_exit(void)
123 {
124 llc_set_station_handler(NULL);
125 }