/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <uapi/linux/bpf.h>
#include <linux/version.h>
#include "bpf_helpers.h"

struct bpf_map_def SEC("maps") dnat_map = {
	.type = BPF_MAP_TYPE_HASH,
	.key_size = sizeof(struct sockaddr_in),
	.value_size = sizeof(struct sockaddr_in),
	.max_entries = 256,
};

/* kprobe is NOT a stable ABI
 * kernel functions can be removed, renamed or completely change semantics.
 * Number of arguments and their positions can change, etc.
 * In such case this bpf+kprobe example will no longer be meaningful
 *
 * This example sits on a syscall, and the syscall ABI is relatively stable
 * of course, across platforms, and over time, the ABI may change.
 */
SEC("kprobe/sys_connect")
int bpf_prog1(struct pt_regs *ctx)
{
	struct sockaddr_in new_addr, orig_addr = {};
	struct sockaddr_in *mapped_addr;
	void *sockaddr_arg = (void *)PT_REGS_PARM2(ctx);
	int sockaddr_len = (int)PT_REGS_PARM3(ctx);

	if (sockaddr_len > sizeof(orig_addr))
		return 0;

	if (bpf_probe_read(&orig_addr, sizeof(orig_addr), sockaddr_arg) != 0)
		return 0;

	mapped_addr = bpf_map_lookup_elem(&dnat_map, &orig_addr);
	if (mapped_addr != NULL) {
		memcpy(&new_addr, mapped_addr, sizeof(new_addr));
		bpf_probe_write_user(sockaddr_arg, &new_addr,
				     sizeof(new_addr));
	}
	return 0;
}

char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;
'/cgit.cgi/linux/net-next.git/log/net/nfc/hci/llc_shdlc.c'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/nfc/hci/llc_shdlc.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>nfc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/hci?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>hci</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>llc_shdlc.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='7a7b5df84b6b4e5d599c7289526eed96541a0654'/><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>Johan Hovold &lt;johan@kernel.org&gt;</td><td class='right'>2017-01-30 11:26:38 +0100</td></tr>
<tr><th>committer</th><td>Jiri Kosina &lt;jkosina@suse.cz&gt;</td><td class='right'>2017-01-31 12:59:32 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>7a7b5df84b6b4e5d599c7289526eed96541a0654</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>cf7514c7ddf4410fe37ca9099a2785e1cf08fa7d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>net/nfc/hci/llc_shdlc.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/hci/llc_shdlc.c?id=877a021e08ccb6434718c0cc781fdf943c884cc0'>877a021e08ccb6434718c0cc781fdf943c884cc0</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/nfc/hci/llc_shdlc.c?id=7a7b5df84b6b4e5d599c7289526eed96541a0654&amp;id2=877a021e08ccb6434718c0cc781fdf943c884cc0'>diff</a>)</td></tr></table>
<div class='commit-subject'>HID: cp2112: fix sleep-while-atomic</div><div class='commit-msg'>A recent commit fixing DMA-buffers on stack added a shared transfer
buffer protected by a spinlock. This is broken as the USB HID request
callbacks can sleep. Fix this up by replacing the spinlock with a mutex.

Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable")
Cc: stable &lt;stable@vger.kernel.org&gt;	# 4.9
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Reviewed-by: Benjamin Tissoires &lt;benjamin.tissoires@redhat.com&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>Diffstat</a> (limited to 'net/nfc/hci/llc_shdlc.c')</div><table summary='diffstat' class='diffstat'>