/*
 * llc_output.c - LLC minimal output path
 *
 * Copyright (c) 1997 by Procom Technology, Inc.
 * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License version 2 for more details.
 */

#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/export.h>
#include <net/llc.h>
#include <net/llc_pdu.h>

/**
 *	llc_mac_hdr_init - fills MAC header fields
 *	@skb: Address of the frame to initialize its MAC header
 *	@sa: The MAC source address
 *	@da: The MAC destination address
 *
 *	Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
 *	is a valid type and initialization completes correctly 1, otherwise.
 */
int llc_mac_hdr_init(struct sk_buff *skb,
		     const unsigned char *sa, const unsigned char *da)
{
	int rc = -EINVAL;

	switch (skb->dev->type) {
	case ARPHRD_ETHER:
	case ARPHRD_LOOPBACK:
		rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
				     skb->len);
		if (rc > 0)
			rc = 0;
		break;
	default:
		break;
	}
	return rc;
}

/**
 *	llc_build_and_send_ui_pkt - unitdata request interface for upper layers
 *	@sap: sap to use
 *	@skb: packet to send
 *	@dmac: destination mac address
 *	@dsap: destination sap
 *
 *	Upper layers calls this function when upper layer wants to send data
 *	using connection-less mode communication (UI pdu).
 *
 *	Accept data frame from network layer to be sent using connection-
 *	less mode communication; timeout/retries handled by network layer;
 *	package primitive as an event and send to SAP event handler
 */
int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
			      unsigned char *dmac, unsigned char dsap)
{
	int rc;
	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
			    dsap, LLC_PDU_CMD);
	llc_pdu_init_as_ui_cmd(skb);
	rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
	if (likely(!rc))
		rc = dev_queue_xmit(skb);
	return rc;
}

EXPORT_SYMBOL(llc_mac_hdr_init);
EXPORT_SYMBOL(llc_build_and_send_ui_pkt);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>bridge</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='efa5356b0d9753b9d7e63e41459eba106cce30f3'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Roopa Prabhu &lt;roopa@cumulusnetworks.com&gt;</td><td class='right'>2017-01-31 22:59:54 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-03 15:21:22 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>efa5356b0d9753b9d7e63e41459eba106cce30f3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/bridge?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>4b017636bfcb26f0f908e762ef871374d9fb2995</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/bridge?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?id=b3c7ef0adadc5768e0baa786213c6bd1ce521a77'>b3c7ef0adadc5768e0baa786213c6bd1ce521a77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/bridge?id=efa5356b0d9753b9d7e63e41459eba106cce30f3&amp;id2=b3c7ef0adadc5768e0baa786213c6bd1ce521a77'>diff</a>)</td></tr></table>
<div class='commit-subject'>bridge: per vlan dst_metadata netlink support</div><div class='commit-msg'>This patch adds support to attach per vlan tunnel info dst
metadata. This enables bridge driver to map vlan to tunnel_info
at ingress and egress. It uses the kernel dst_metadata infrastructure.

The initial use case is vlan to vni bridging, but the api is generic
to extend to any tunnel_info in the future:
    - Uapi to configure/unconfigure/dump per vlan tunnel data
    - netlink functions to configure vlan and tunnel_info mapping
    - Introduces bridge port flag BR_LWT_VLAN to enable attach/detach
    dst_metadata to bridged packets on ports. off by default.
    - changes to existing code is mainly refactor some existing vlan
    handling netlink code + hooks for new vlan tunnel code
    - I have kept the vlan tunnel code isolated in separate files.
    - most of the netlink vlan tunnel code is handling of vlan-tunid
    ranges (follows the vlan range handling code). To conserve space
    vlan-tunid by default are always dumped in ranges if applicable.

Use case:
example use for this is a vxlan bridging gateway or vtep
which maps vlans to vn-segments (or vnis).

iproute2 example (patched and pruned iproute2 output to just show
relevant fdb entries):
example shows same host mac learnt on two vni's and
vlan 100 maps to vni 1000, vlan 101 maps to vni 1001

before (netdev per vni):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan1001 vlan 101 master bridge
00:02:00:00:00:03 dev vxlan1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan1000 vlan 100 master bridge
00:02:00:00:00:03 dev vxlan1000 dst 12.0.0.8 self

after this patch with collect metdata in bridged mode (single netdev):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan0 vlan 101 master bridge
00:02:00:00:00:03 dev vxlan0 src_vni 1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan0 vlan 100 master bridge
00:02:00:00:00:03 dev vxlan0 src_vni 1000 dst 12.0.0.8 self

CC: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: Roopa Prabhu &lt;roopa@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>Diffstat</a> (limited to 'net/bridge')</div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/Makefile?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/Makefile</a></td><td class='right'>5</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 1.0%;'/><td class='rem' style='width: 0.7%;'/><td class='none' style='width: 98.3%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_netlink.c?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_netlink.c</a></td><td class='right'>140</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 32.1%;'/><td class='rem' style='width: 15.2%;'/><td class='none' style='width: 52.7%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='add'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_netlink_tunnel.c?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_netlink_tunnel.c</a></td><td class='right'>296</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 100.0%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_private.h?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_private.h</a></td><td class='right'>10</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 3.4%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 96.6%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='add'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_private_tunnel.h?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_private_tunnel.h</a></td><td class='right'>72</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 24.3%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 75.7%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_vlan.c?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_vlan.c</a></td><td class='right'>17</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 5.4%;'/><td class='rem' style='width: 0.3%;'/><td class='none' style='width: 94.3%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='add'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_vlan_tunnel.c?id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>net/bridge/br_vlan_tunnel.c</a></td><td class='right'>149</td><td class='graph'><table summary='file diffstat' width='100%'><tr><td class='add' style='width: 50.3%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 49.7%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>7 files changed, 641 insertions, 48 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/net/bridge/Makefile b/net/bridge/Makefile