projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 0e9facca | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 1da177e4 LT |
2 | /* |
| 3 | * llc_output.c - LLC minimal output path | |
| 4 | * | |
| 5 | * Copyright (c) 1997 by Procom Technology, Inc. | |
| 6 | * 2001-2003 by Arnaldo Carvalho de Melo <[email protected]> | |
| 1da177e4 LT |
7 | */ |
| 8 | ||
| 9 | #include <linux/if_arp.h> | |
| 1da177e4 | 10 | #include <linux/netdevice.h> |
| 1da177e4 | 11 | #include <linux/skbuff.h> |
| bc3b2d7f | 12 | #include <linux/export.h> |
| 1da177e4 LT |
13 | #include <net/llc.h> |
| 14 | #include <net/llc_pdu.h> | |
| 15 | ||
| 16 | /** | |
| 17 | * llc_mac_hdr_init - fills MAC header fields | |
| 18 | * @skb: Address of the frame to initialize its MAC header | |
| 19 | * @sa: The MAC source address | |
| 20 | * @da: The MAC destination address | |
| 21 | * | |
| 22 | * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type | |
| 23 | * is a valid type and initialization completes correctly 1, otherwise. | |
| 24 | */ | |
| f4ad2b16 SH |
25 | int llc_mac_hdr_init(struct sk_buff *skb, |
| 26 | const unsigned char *sa, const unsigned char *da) | |
| 1da177e4 | 27 | { |
| bf9ae538 | 28 | int rc = -EINVAL; |
| 1da177e4 LT |
29 | |
| 30 | switch (skb->dev->type) { | |
| 1da177e4 | 31 | case ARPHRD_ETHER: |
| bf9ae538 OP |
32 | case ARPHRD_LOOPBACK: |
| 33 | rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, | |
| 34 | skb->len); | |
| 35 | if (rc > 0) | |
| 36 | rc = 0; | |
| 1da177e4 | 37 | break; |
| 1da177e4 | 38 | default: |
| 0f1a24c9 | 39 | break; |
| 1da177e4 LT |
40 | } |
| 41 | return rc; | |
| 42 | } | |
| 43 | ||
| 44 | /** | |
| 45 | * llc_build_and_send_ui_pkt - unitdata request interface for upper layers | |
| 46 | * @sap: sap to use | |
| 47 | * @skb: packet to send | |
| 48 | * @dmac: destination mac address | |
| 49 | * @dsap: destination sap | |
| 50 | * | |
| 51 | * Upper layers calls this function when upper layer wants to send data | |
| 52 | * using connection-less mode communication (UI pdu). | |
| 53 | * | |
| 54 | * Accept data frame from network layer to be sent using connection- | |
| 55 | * less mode communication; timeout/retries handled by network layer; | |
| 56 | * package primitive as an event and send to SAP event handler | |
| 57 | */ | |
| 58 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, | |
| 2ef6db76 | 59 | const unsigned char *dmac, unsigned char dsap) |
| 1da177e4 LT |
60 | { |
| 61 | int rc; | |
| 62 | llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
| 63 | dsap, LLC_PDU_CMD); | |
| 64 | llc_pdu_init_as_ui_cmd(skb); | |
| 65 | rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); | |
| 249ff1c6 | 66 | if (likely(!rc)) |
| 1da177e4 | 67 | rc = dev_queue_xmit(skb); |
| 8fb44d60 ED |
68 | else |
| 69 | kfree_skb(skb); | |
| 1da177e4 LT |
70 | return rc; |
| 71 | } | |
| 72 | ||
| 73 | EXPORT_SYMBOL(llc_mac_hdr_init); | |
| 74 | EXPORT_SYMBOL(llc_build_and_send_ui_pkt); |