/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Copyright 2009, 2010 Emmanuel Roullit.
 * Copyright 2014, 2015 Tobias Klauser.
 * 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 "die.h"
#include "xmalloc.h"
#include "ring_tx.h"
#include "built_in.h"

static void set_packet_loss_discard(int sock)
{
	int ret, discard = 1;
	ret = setsockopt(sock, SOL_PACKET, PACKET_LOSS, (void *) &discard,
			 sizeof(discard));
	if (ret < 0)
		panic("setsockopt: cannot set packet loss");
}

void destroy_tx_ring(int sock, struct ring *ring)
{
	int ret;

	munmap(ring->mm_space, ring->mm_len);
	ring->mm_len = 0;

	fmemset(&ring->layout, 0, sizeof(ring->layout));
	ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
			 sizeof(ring->layout));
	if (unlikely(ret))
		panic("Cannot destroy the TX_RING: %s!\n", strerror(errno));

	xfree(ring->frames);
}

static void setup_tx_ring_layout(int sock, struct ring *ring, size_t size,
				 bool jumbo_support)
{
	setup_ring_layout_generic(sock, ring, size, jumbo_support);

	set_sockopt_tpacket_v2(sock);

	ring_verify_layout(ring);
}

static void create_tx_ring(int sock, struct ring *ring, bool verbose)
{
	int ret;
retry:
	ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
			 sizeof(ring->layout));

	if (errno == ENOMEM && ring->layout.tp_block_nr > 1) {
		ring->layout.tp_block_nr >>= 1;
		ring->layout.tp_frame_nr = ring->layout.tp_block_size / 
					   ring->layout.tp_frame_size * 
					   ring->layout.tp_block_nr;
		goto retry;
	}

	if (ret < 0)
		panic("Cannot allocate TX_RING!\n");

	ring->mm_len = (size_t) ring->layout.tp_block_size * ring->layout.tp_block_nr;

	if (verbose) {
		printf("TX,V2: %.2Lf MiB, %u Frames, each %u Byte allocated\n",
		       (long double) ring->mm_len / (1 << 20),
		       ring->layout.tp_frame_nr, ring->layout.tp_frame_size);
	}
}

static void alloc_tx_ring_frames(int sock __maybe_unused, struct ring *ring)
{
	alloc_ring_frames_generic(ring, ring->layout.tp_frame_nr,
				  ring->layout.tp_frame_size);
}

void ring_tx_setup(struct ring *ring, int sock, size_t size, int ifindex,
		   bool jumbo_support, bool verbose)
{
	fmemset(ring, 0, sizeof(*ring));
	set_packet_loss_discard(sock);
	setup_tx_ring_layout(sock, ring, size, jumbo_support);
	create_tx_ring(sock, ring, verbose);
	mmap_ring_generic(sock, ring);
	alloc_tx_ring_frames(sock, ring);
	bind_ring_generic(sock, ring, ifindex, true);
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>Documentation</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>devicetree</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>bindings</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>net</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='23ea5967d6bd30ed59480edbc5fe21eec81682a3'/><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>Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;</td><td class='right'>2016-05-16 17:25:08 -0700</td></tr>
<tr><th>committer</th><td>Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;</td><td class='right'>2016-05-16 17:25:08 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>23ea5967d6bd30ed59480edbc5fe21eec81682a3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>345bf01823cf76596bc05e83fab9bf21678fef90</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>Documentation/devicetree/bindings/net</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/net?id=c52c545ead97fcc2f4f8ea38f1ae3c23211e09a8'>c52c545ead97fcc2f4f8ea38f1ae3c23211e09a8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3&amp;id2=c52c545ead97fcc2f4f8ea38f1ae3c23211e09a8'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/net?id=d96caf8c33cad42b5eabcf1b686dd91581e306f4'>d96caf8c33cad42b5eabcf1b686dd91581e306f4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/devicetree/bindings/net?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3&amp;id2=d96caf8c33cad42b5eabcf1b686dd91581e306f4'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'next' into for-linus</div><div class='commit-msg'>Prepare first round of input updates for 4.7 merge window.
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=23ea5967d6bd30ed59480edbc5fe21eec81682a3'>Diffstat</a> (limited to 'Documentation/devicetree/bindings/net')</div><table summary='diffstat' class='diffstat'>