/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>

#include "xmalloc.h"
#include "die.h"
#include "ring.h"
#include "built_in.h"

void mmap_ring_generic(int sock, struct ring *ring)
{
	ring->mm_space = mmap(NULL, ring->mm_len, PROT_READ | PROT_WRITE,
			      MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
	if (ring->mm_space == MAP_FAILED)
		panic("Cannot mmap {TX,RX}_RING!\n");
}

void alloc_ring_frames_generic(struct ring *ring, int num, size_t size)
{
	int i;
	size_t len = num * sizeof(*ring->frames);

	ring->frames = xmalloc_aligned(len, CO_CACHE_LINE_SIZE);
	fmemset(ring->frames, 0, len);

	for (i = 0; i < num; ++i) {
		ring->frames[i].iov_len = size;
		ring->frames[i].iov_base = ring->mm_space + (i * size);
	}
}

void bind_ring_generic(int sock, struct ring *ring, int ifindex, bool tx_only)
{
	int ret;
	/* The {TX,RX}_RING registers itself to the networking stack with
	 * dev_add_pack(), so we have one single RX_RING for all devs
	 * otherwise you'll get the packet twice.
	 */
	fmemset(&ring->s_ll, 0, sizeof(ring->s_ll));

	ring->s_ll.sll_family = AF_PACKET;
	if (tx_only)
		ring->s_ll.sll_protocol = 0;
	else
		ring->s_ll.sll_protocol = htons(ETH_P_ALL);
	ring->s_ll.sll_ifindex = ifindex;
	ring->s_ll.sll_hatype = 0;
	ring->s_ll.sll_halen = 0;
	ring->s_ll.sll_pkttype = 0;

	ret = bind(sock, (struct sockaddr *) &ring->s_ll, sizeof(ring->s_ll));
	if (ret < 0)
		panic("Cannot bind {TX,RX}_RING!\n");
}
next.git/refs/?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/Documentation/hwmon/tmp401?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/Documentation/hwmon/tmp401'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='eedf265aa003b4781de24cfed40a655a664457e6'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>Documentation</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/hwmon?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>hwmon</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>tmp401</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='eedf265aa003b4781de24cfed40a655a664457e6'/><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>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2016-06-02 10:29:47 -0500</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-06-05 10:36:01 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>eedf265aa003b4781de24cfed40a655a664457e6</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/hwmon/tmp401?id=eedf265aa003b4781de24cfed40a655a664457e6'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>0e37f0a0c6fd15f7528aa3d3bfaec5685f083282</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>Documentation/hwmon/tmp401</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=049ec1b5a76d34a6980cccdb7c0baeb4eed7a993'>049ec1b5a76d34a6980cccdb7c0baeb4eed7a993</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/hwmon/tmp401?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6&amp;id2=049ec1b5a76d34a6980cccdb7c0baeb4eed7a993'>diff</a>)</td></tr></table>
<div class='commit-subject'>devpts: Make each mount of devpts an independent filesystem.</div><div class='commit-msg'>The /dev/ptmx device node is changed to lookup the directory entry "pts"
in the same directory as the /dev/ptmx device node was opened in.  If
there is a "pts" entry and that entry is a devpts filesystem /dev/ptmx
uses that filesystem.  Otherwise the open of /dev/ptmx fails.

The DEVPTS_MULTIPLE_INSTANCES configuration option is removed, so that
userspace can now safely depend on each mount of devpts creating a new
instance of the filesystem.

Each mount of devpts is now a separate and equal filesystem.

Reserved ttys are now available to all instances of devpts where the
mounter is in the initial mount namespace.

A new vfs helper path_pts is introduced that finds a directory entry
named "pts" in the directory of the passed in path, and changes the
passed in path to point to it.  The helper path_pts uses a function
path_parent_directory that was factored out of follow_dotdot.

In the implementation of devpts:
 - devpts_mnt is killed as it is no longer meaningful if all mounts of
   devpts are equal.
 - pts_sb_from_inode is replaced by just inode-&gt;i_sb as all cached
   inodes in the tty layer are now from the devpts filesystem.
 - devpts_add_ref is rolled into the new function devpts_ptmx.  And the
   unnecessary inode hold is removed.
 - devpts_del_ref is renamed devpts_release and reduced to just a
   deacrivate_super.
 - The newinstance mount option continues to be accepted but is now
   ignored.

In devpts_fs.h definitions for when !CONFIG_UNIX98_PTYS are removed as
they are never used.

Documentation/filesystems/devices.txt is updated to describe the current
situation.

This has been verified to work properly on openwrt-15.05, centos5,
centos6, centos7, debian-6.0.2, debian-7.9, debian-8.2, ubuntu-14.04.3,
ubuntu-15.10, fedora23, magia-5, mint-17.3, opensuse-42.1,
slackware-14.1, gentoo-20151225 (13.0?), archlinux-2015-12-01.  With the
caveat that on centos6 and on slackware-14.1 that there wind up being
two instances of the devpts filesystem mounted on /dev/pts, the lower
copy does not end up getting used.

Signed-off-by: "Eric W. Biederman" &lt;ebiederm@xmission.com&gt;
Cc: Greg KH &lt;greg@kroah.com&gt;
Cc: Peter Hurley &lt;peter@hurleysoftware.com&gt;
Cc: Peter Anvin &lt;hpa@zytor.com&gt;
Cc: Andy Lutomirski &lt;luto@amacapital.net&gt;
Cc: Al Viro &lt;viro@zeniv.linux.org.uk&gt;
Cc: Serge Hallyn &lt;serge.hallyn@ubuntu.com&gt;
Cc: Willy Tarreau &lt;w@1wt.eu&gt;
Cc: Aurelien Jarno &lt;aurelien@aurel32.net&gt;
Cc: One Thousand Gnomes &lt;gnomes@lxorguk.ukuu.org.uk&gt;
Cc: Jann Horn &lt;jann@thejh.net&gt;
Cc: Jiri Slaby &lt;jslaby@suse.com&gt;
Cc: Florian Weimer &lt;fw@deneb.enyo.de&gt;
Cc: Konstantin Khlebnikov &lt;koct9i@gmail.com&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=eedf265aa003b4781de24cfed40a655a664457e6'>Diffstat</a> (limited to 'Documentation/hwmon/tmp401')</div><table summary='diffstat' class='diffstat'>