/*
 *  The NFC Controller Interface is the communication protocol between an
 *  NFC Controller (NFCC) and a Device Host (DH).
 *
 *  Copyright (C) 2011 Texas Instruments, Inc.
 *
 *  Written by Ilan Elias <ilane@ti.com>
 *
 *  Acknowledgements:
 *  This file is based on lib.c, which was written
 *  by Maxim Krasnyansky.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>

#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>

/* NCI status codes to Unix errno mapping */
int nci_to_errno(__u8 code)
{
	switch (code) {
	case NCI_STATUS_OK:
		return 0;

	case NCI_STATUS_REJECTED:
		return -EBUSY;

	case NCI_STATUS_RF_FRAME_CORRUPTED:
		return -EBADMSG;

	case NCI_STATUS_NOT_INITIALIZED:
		return -EHOSTDOWN;

	case NCI_STATUS_SYNTAX_ERROR:
	case NCI_STATUS_SEMANTIC_ERROR:
	case NCI_STATUS_INVALID_PARAM:
	case NCI_STATUS_RF_PROTOCOL_ERROR:
	case NCI_STATUS_NFCEE_PROTOCOL_ERROR:
		return -EPROTO;

	case NCI_STATUS_UNKNOWN_GID:
	case NCI_STATUS_UNKNOWN_OID:
		return -EBADRQC;

	case NCI_STATUS_MESSAGE_SIZE_EXCEEDED:
		return -EMSGSIZE;

	case NCI_STATUS_DISCOVERY_ALREADY_STARTED:
		return -EALREADY;

	case NCI_STATUS_DISCOVERY_TARGET_ACTIVATION_FAILED:
	case NCI_STATUS_NFCEE_INTERFACE_ACTIVATION_FAILED:
		return -ECONNREFUSED;

	case NCI_STATUS_RF_TRANSMISSION_ERROR:
	case NCI_STATUS_NFCEE_TRANSMISSION_ERROR:
		return -ECOMM;

	case NCI_STATUS_RF_TIMEOUT_ERROR:
	case NCI_STATUS_NFCEE_TIMEOUT_ERROR:
		return -ETIMEDOUT;

	case NCI_STATUS_FAILED:
	default:
		return -ENOSYS;
	}
}
EXPORT_SYMBOL(nci_to_errno);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='29ba6e7400a317725bdfb86a725d1824447dbcd7'/><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>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-07 13:07:56 -0500</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-07 13:07:56 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>29ba6e7400a317725bdfb86a725d1824447dbcd7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>b009850c5a2e7c633a94eeacb71a25f91b4b64f0</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=b08d46b01e995dd7b653b22d35bd1d958d6ee9b4'>b08d46b01e995dd7b653b22d35bd1d958d6ee9b4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7&amp;id2=b08d46b01e995dd7b653b22d35bd1d958d6ee9b4'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=51ce8bd4d17a761e1a90a34a1b5c9b762cce7553'>51ce8bd4d17a761e1a90a34a1b5c9b762cce7553</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=29ba6e7400a317725bdfb86a725d1824447dbcd7&amp;id2=51ce8bd4d17a761e1a90a34a1b5c9b762cce7553'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'replace-dst_confirm'</div><div class='commit-msg'>Julian Anastasov says:

====================
net: dst_confirm replacement

	This patchset addresses the problem of neighbour
confirmation where received replies from one nexthop
can cause confirmation of different nexthop when using
the same dst. Thanks to YueHaibing &lt;yuehaibing@huawei.com&gt;
for tracking the dst-&gt;pending_confirm problem.

	Sockets can obtain cached output route. Such
routes can be to known nexthop (rt_gateway=IP) or to be
used simultaneously for different nexthop IPs by different
subnet prefixes (nh-&gt;nh_scope = RT_SCOPE_HOST, rt_gateway=0).

	At first look, there are more problems:

- dst_confirm() sets flag on dst and not on dst-&gt;path,
as result, indication is lost when XFRM is used

- DNAT can change the nexthop, so the really used nexthop is
not confirmed

	So, the following solution is to avoid using
dst-&gt;pending_confirm.

	The current dst_confirm() usage is as follows:

Protocols confirming dst on received packets:
- TCP (1 dst per socket)
- SCTP (1 dst per transport)
- CXGB*

Protocols supporting sendmsg with MSG_CONFIRM [ | MSG_PROBE ] to
confirm neighbour:
- UDP IPv4/IPv6
- ICMPv4 PING
- RAW IPv4/IPv6
- L2TP/IPv6

MSG_CONFIRM for other purposes (fix not needed):
- CAN

Sending without locking the socket:
- UDP (when no cork)
- RAW (when hdrincl=1)

Redirects from old to new GW:
- rt6_do_redirect

	The patchset includes the following changes:

1. sock: add sk_dst_pending_confirm flag

- used only by TCP with patch 4 to remember the received
indication in sk-&gt;sk_dst_pending_confirm

2. net: add dst_pending_confirm flag to skbuff

- skb-&gt;dst_pending_confirm will be used by all protocols
in following patches, via skb_{set,get}_dst_pending_confirm

3. sctp: add dst_pending_confirm flag

- SCTP uses per-transport dsts and can not use
sk-&gt;sk_dst_pending_confirm like TCP

4. tcp: replace dst_confirm with sk_dst_confirm

5. net: add confirm_neigh method to dst_ops

- IPv4 and IPv6 provision for slow neigh lookups for MSG_PROBE users.
I decided to use neigh lookup only for this case because on
MSG_PROBE the skb may pass MTU checks but it does not reach
the neigh confirmation code. This patch will be used from patch 6.

- xfrm_confirm_neigh: we use the last tunnel address, if present.
When there are only transports, the original dest address is used.

6. net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP

- dst_confirm conversion for UDP, RAW, ICMP and L2TP/IPv6

- these protocols use MSG_CONFIRM propagated by ip*_append_data
to skb-&gt;dst_pending_confirm. sk-&gt;sk_dst_pending_confirm is not
used because some sending paths do not lock the socket. For
MSG_PROBE we use the slow lookup (dst_confirm_neigh).

- there are also 2 cases that need the slow lookup:
__ip6_rt_update_pmtu and rt6_do_redirect. I hope
&amp;ipv6_hdr(skb)-&gt;saddr is the correct nexthop address to use here.

7. net: pending_confirm is not used anymore

- I failed to understand the CXGB* code, I see dst_confirm()
calls but I'm not sure dst_neigh_output() was called. For now
I just removed the dst-&gt;pending_confirm flag and left all
dst_confirm() calls there. Any better idea?

- Now may be old function neigh_output() should be restored
instead of dst_neigh_output?
====================

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=29ba6e7400a317725bdfb86a725d1824447dbcd7'>Diffstat</a> (limited to 'include')</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/include/linux/skbuff.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/linux/skbuff.h</a></td><td class='right'>12</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 46.2%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 53.8%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/arp.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/arp.h</a></td><td class='right'>16</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 61.5%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 38.5%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/dst.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/dst.h</a></td><td class='right'>21</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 34.6%;'/><td class='rem' style='width: 46.2%;'/><td class='none' style='width: 19.2%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/dst_ops.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/dst_ops.h</a></td><td class='right'>2</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 7.7%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 92.3%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/ndisc.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/ndisc.h</a></td><td class='right'>17</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 65.4%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 34.6%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/sctp/sctp.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/sctp/sctp.h</a></td><td class='right'>6</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 7.7%;'/><td class='rem' style='width: 15.4%;'/><td class='none' style='width: 76.9%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/sctp/structs.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/sctp/structs.h</a></td><td class='right'>4</td><td class='graph'><table summary='file diffstat' width='26%'><tr><td class='add' style='width: 15.4%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 84.6%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/sock.h?id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>include/net/sock.h</a></td><td class='right'>26</td><td class='graph'><table summary='file diffstat' width='26%'><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>
</table><div class='diffstat-summary'>8 files changed, 88 insertions, 16 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h