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1da177e4 LT |
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> | |
bc3b2d7f | 21 | #include <linux/export.h> |
1da177e4 LT |
22 | #include <net/llc.h> |
23 | #include <net/llc_pdu.h> | |
24 | ||
25 | /** | |
26 | * llc_mac_hdr_init - fills MAC header fields | |
27 | * @skb: Address of the frame to initialize its MAC header | |
28 | * @sa: The MAC source address | |
29 | * @da: The MAC destination address | |
30 | * | |
31 | * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type | |
32 | * is a valid type and initialization completes correctly 1, otherwise. | |
33 | */ | |
f4ad2b16 SH |
34 | int llc_mac_hdr_init(struct sk_buff *skb, |
35 | const unsigned char *sa, const unsigned char *da) | |
1da177e4 | 36 | { |
bf9ae538 | 37 | int rc = -EINVAL; |
1da177e4 LT |
38 | |
39 | switch (skb->dev->type) { | |
bf9ae538 | 40 | case ARPHRD_IEEE802_TR: |
1da177e4 | 41 | case ARPHRD_ETHER: |
bf9ae538 OP |
42 | case ARPHRD_LOOPBACK: |
43 | rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, | |
44 | skb->len); | |
45 | if (rc > 0) | |
46 | rc = 0; | |
1da177e4 | 47 | break; |
1da177e4 | 48 | default: |
bf9ae538 | 49 | WARN(1, "device type not supported: %d\n", skb->dev->type); |
1da177e4 LT |
50 | } |
51 | return rc; | |
52 | } | |
53 | ||
54 | /** | |
55 | * llc_build_and_send_ui_pkt - unitdata request interface for upper layers | |
56 | * @sap: sap to use | |
57 | * @skb: packet to send | |
58 | * @dmac: destination mac address | |
59 | * @dsap: destination sap | |
60 | * | |
61 | * Upper layers calls this function when upper layer wants to send data | |
62 | * using connection-less mode communication (UI pdu). | |
63 | * | |
64 | * Accept data frame from network layer to be sent using connection- | |
65 | * less mode communication; timeout/retries handled by network layer; | |
66 | * package primitive as an event and send to SAP event handler | |
67 | */ | |
68 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, | |
69 | unsigned char *dmac, unsigned char dsap) | |
70 | { | |
71 | int rc; | |
72 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
73 | dsap, LLC_PDU_CMD); | |
74 | llc_pdu_init_as_ui_cmd(skb); | |
75 | rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); | |
249ff1c6 | 76 | if (likely(!rc)) |
1da177e4 LT |
77 | rc = dev_queue_xmit(skb); |
78 | return rc; | |
79 | } | |
80 | ||
81 | EXPORT_SYMBOL(llc_mac_hdr_init); | |
82 | EXPORT_SYMBOL(llc_build_and_send_ui_pkt); |