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1 | /* |
2 | * llc_output.c - LLC minimal output path |
3 | * |
4 | * Copyright (c) 1997 by Procom Technology, Inc. |
5 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
6 | * |
7 | * This program can be redistributed or modified under the terms of the |
8 | * GNU General Public License version 2 as published by the Free Software |
9 | * Foundation. |
10 | * This program is distributed without any warranty or implied warranty |
11 | * of merchantability or fitness for a particular purpose. |
12 | * |
13 | * See the GNU General Public License version 2 for more details. |
14 | */ |
15 | |
16 | #include <linux/if_arp.h> |
17 | #include <linux/if_tr.h> |
18 | #include <linux/netdevice.h> |
19 | #include <linux/trdevice.h> |
20 | #include <linux/skbuff.h> |
21 | #include <net/llc.h> |
22 | #include <net/llc_pdu.h> |
23 | |
24 | /** |
25 | * llc_mac_hdr_init - fills MAC header fields |
26 | * @skb: Address of the frame to initialize its MAC header |
27 | * @sa: The MAC source address |
28 | * @da: The MAC destination address |
29 | * |
30 | * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type |
31 | * is a valid type and initialization completes correctly 1, otherwise. |
32 | */ |
33 | int llc_mac_hdr_init(struct sk_buff *skb, |
34 | const unsigned char *sa, const unsigned char *da) |
35 | { |
36 | int rc = -EINVAL; |
37 | |
38 | switch (skb->dev->type) { |
39 | case ARPHRD_IEEE802_TR: |
40 | case ARPHRD_ETHER: |
41 | case ARPHRD_LOOPBACK: |
42 | rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, |
43 | skb->len); |
44 | if (rc > 0) |
45 | rc = 0; |
46 | break; |
47 | default: |
48 | WARN(1, "device type not supported: %d\n", skb->dev->type); |
49 | } |
50 | return rc; |
51 | } |
52 | |
53 | /** |
54 | * llc_build_and_send_ui_pkt - unitdata request interface for upper layers |
55 | * @sap: sap to use |
56 | * @skb: packet to send |
57 | * @dmac: destination mac address |
58 | * @dsap: destination sap |
59 | * |
60 | * Upper layers calls this function when upper layer wants to send data |
61 | * using connection-less mode communication (UI pdu). |
62 | * |
63 | * Accept data frame from network layer to be sent using connection- |
64 | * less mode communication; timeout/retries handled by network layer; |
65 | * package primitive as an event and send to SAP event handler |
66 | */ |
67 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
68 | unsigned char *dmac, unsigned char dsap) |
69 | { |
70 | int rc; |
71 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
72 | dsap, LLC_PDU_CMD); |
73 | llc_pdu_init_as_ui_cmd(skb); |
74 | rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); |
75 | if (likely(!rc)) |
76 | rc = dev_queue_xmit(skb); |
77 | return rc; |
78 | } |
79 | |
80 | EXPORT_SYMBOL(llc_mac_hdr_init); |
81 | EXPORT_SYMBOL(llc_build_and_send_ui_pkt); |
82 |
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