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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - net/llc/llc_station.c
2 * llc_station.c - station component of LLC
4 * Copyright (c) 1997 by Procom Technology, Inc.
5 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
7 * This program can be redistributed or modified under the terms of the
8 * GNU General Public License as published by the Free Software Foundation.
9 * This program is distributed without any warranty or implied warranty
10 * of merchantability or fitness for a particular purpose.
12 * See the GNU General Public License for more details.
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.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>
28 static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff
*skb
)
30 struct llc_pdu_un
*pdu
= llc_pdu_un_hdr(skb
);
32 return LLC_PDU_IS_CMD(pdu
) && /* command PDU */
33 LLC_PDU_TYPE_IS_U(pdu
) && /* U type PDU */
34 LLC_U_PDU_CMD(pdu
) == LLC_1_PDU_CMD_XID
&&
35 !pdu
->dsap
? 0 : 1; /* NULL DSAP value */
38 static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff
*skb
)
40 struct llc_pdu_un
*pdu
= llc_pdu_un_hdr(skb
);
42 return LLC_PDU_IS_CMD(pdu
) && /* command PDU */
43 LLC_PDU_TYPE_IS_U(pdu
) && /* U type PDU */
44 LLC_U_PDU_CMD(pdu
) == LLC_1_PDU_CMD_TEST
&&
45 !pdu
->dsap
? 0 : 1; /* NULL DSAP */
48 static int llc_station_ac_send_xid_r(struct sk_buff
*skb
)
50 u8 mac_da
[ETH_ALEN
], dsap
;
52 struct sk_buff
*nskb
= llc_alloc_frame(NULL
, skb
->dev
, LLC_PDU_TYPE_U
,
53 sizeof(struct llc_xid_info
));
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
);
73 static int llc_station_ac_send_test_r(struct sk_buff
*skb
)
75 u8 mac_da
[ETH_ALEN
], dsap
;
80 /* The test request command is type U (llc_len = 3) */
81 data_size
= ntohs(eth_hdr(skb
)->h_proto
) - 3;
82 nskb
= llc_alloc_frame(NULL
, skb
->dev
, LLC_PDU_TYPE_U
, data_size
);
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
);
103 * llc_station_rcv - send received pdu to the station state machine
104 * @skb: received frame.
106 * Sends data unit to station state machine.
108 static void llc_station_rcv(struct sk_buff
*skb
)
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
);
117 void __init
llc_station_init(void)
119 llc_set_station_handler(llc_station_rcv
);
122 void llc_station_exit(void)
124 llc_set_station_handler(NULL
);