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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/netdevice.h> |
18 | #include <linux/skbuff.h> |
19 | #include <linux/export.h> |
20 | #include <net/llc.h> |
21 | #include <net/llc_pdu.h> |
22 | |
23 | /** |
24 | * llc_mac_hdr_init - fills MAC header fields |
25 | * @skb: Address of the frame to initialize its MAC header |
26 | * @sa: The MAC source address |
27 | * @da: The MAC destination address |
28 | * |
29 | * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type |
30 | * is a valid type and initialization completes correctly 1, otherwise. |
31 | */ |
32 | int llc_mac_hdr_init(struct sk_buff *skb, |
33 | const unsigned char *sa, const unsigned char *da) |
34 | { |
35 | int rc = -EINVAL; |
36 | |
37 | switch (skb->dev->type) { |
38 | case ARPHRD_ETHER: |
39 | case ARPHRD_LOOPBACK: |
40 | rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, |
41 | skb->len); |
42 | if (rc > 0) |
43 | rc = 0; |
44 | break; |
45 | default: |
46 | WARN(1, "device type not supported: %d\n", skb->dev->type); |
47 | } |
48 | return rc; |
49 | } |
50 | |
51 | /** |
52 | * llc_build_and_send_ui_pkt - unitdata request interface for upper layers |
53 | * @sap: sap to use |
54 | * @skb: packet to send |
55 | * @dmac: destination mac address |
56 | * @dsap: destination sap |
57 | * |
58 | * Upper layers calls this function when upper layer wants to send data |
59 | * using connection-less mode communication (UI pdu). |
60 | * |
61 | * Accept data frame from network layer to be sent using connection- |
62 | * less mode communication; timeout/retries handled by network layer; |
63 | * package primitive as an event and send to SAP event handler |
64 | */ |
65 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
66 | unsigned char *dmac, unsigned char dsap) |
67 | { |
68 | int rc; |
69 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
70 | dsap, LLC_PDU_CMD); |
71 | llc_pdu_init_as_ui_cmd(skb); |
72 | rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); |
73 | if (likely(!rc)) |
74 | rc = dev_queue_xmit(skb); |
75 | return rc; |
76 | } |
77 | |
78 | EXPORT_SYMBOL(llc_mac_hdr_init); |
79 | EXPORT_SYMBOL(llc_build_and_send_ui_pkt); |
80 |
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