cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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llc_output.c (2026B)

      1// SPDX-License-Identifier: GPL-2.0-only
      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 <acme@conectiva.com.br>
      7 */
      8
      9#include <linux/if_arp.h>
     10#include <linux/netdevice.h>
     11#include <linux/skbuff.h>
     12#include <linux/export.h>
     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 */
     25int llc_mac_hdr_init(struct sk_buff *skb,
     26		     const unsigned char *sa, const unsigned char *da)
     27{
     28	int rc = -EINVAL;
     29
     30	switch (skb->dev->type) {
     31	case ARPHRD_ETHER:
     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;
     37		break;
     38	default:
     39		break;
     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 */
     58int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
     59			      const unsigned char *dmac, unsigned char dsap)
     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);
     66	if (likely(!rc))
     67		rc = dev_queue_xmit(skb);
     68	else
     69		kfree_skb(skb);
     70	return rc;
     71}
     72
     73EXPORT_SYMBOL(llc_mac_hdr_init);
     74EXPORT_SYMBOL(llc_build_and_send_ui_pkt);