/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2012 Markus Amend <markus@netsniff-ng.org>, Deutsche Flugsicherung GmbH
 * Subject to the GPL, version 2.
 *
 * IPv6 Hop-By-Hop Header described in RFC2460
 */

#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h>    /* for ntohs() */

#include "proto.h"
#include "protos.h"
#include "dissector_eth.h"
#include "built_in.h"
#include "pkt_buff.h"

struct hop_by_hophdr {
	uint8_t h_next_header;
	uint8_t hdr_len;
} __packed;

static void dissect_opt_hop (struct pkt_buff *pkt, ssize_t *opt_len)
{
	/* Have to been upgraded.
	 * http://tools.ietf.org/html/rfc2460#section-4.2
	 * Look also for proto_ipv6_dest_opts.h, it needs
	 * dissect_opt(), too.
	 */
	if (*opt_len)
		tprintf(", Option(s) recognized ");

	/* If adding dissector reduce opt_len for each using of pkt_pull
	 * to the same size.
	 */
}

static void hop_by_hop(struct pkt_buff *pkt)
{
	uint16_t hdr_ext_len;
	ssize_t opt_len;
	struct hop_by_hophdr *hop_ops;

	hop_ops = (struct hop_by_hophdr *) pkt_pull(pkt, sizeof(*hop_ops));
	if (hop_ops == NULL)
		return;

	/* Total Header Length in Bytes */
	hdr_ext_len = (hop_ops->hdr_len + 1) * 8;
	/* Options length in Bytes */
	opt_len = hdr_ext_len - sizeof(*hop_ops);

	tprintf("\t [ Hop-by-Hop Options ");
	tprintf("NextHdr (%u), ", hop_ops->h_next_header);
	if (opt_len > pkt_len(pkt) || opt_len < 0){
		tprintf("HdrExtLen (%u, %u Bytes, %s)", hop_ops->hdr_len,
		      hdr_ext_len, colorize_start_full(black, red)
		      "invalid" colorize_end());
		      return;
	}
	tprintf("HdrExtLen (%u, %u Bytes)", hop_ops->hdr_len,
		hdr_ext_len);

	dissect_opt_hop(pkt, &opt_len);

	tprintf(" ]\n");

	pkt_pull(pkt, opt_len);
	pkt_set_proto(pkt, &eth_lay3, hop_ops->h_next_header);
}

static void hop_by_hop_less(struct pkt_buff *pkt)
{
	uint16_t hdr_ext_len;
	ssize_t opt_len;
	struct hop_by_hophdr *hop_ops;

	hop_ops = (struct hop_by_hophdr *) pkt_pull(pkt, sizeof(*hop_ops));
	if (hop_ops == NULL)
		return;

	/* Total Header Length in Bytes */
	hdr_ext_len = (hop_ops->hdr_len + 1) * 8;
	/* Options length in Bytes */
	opt_len = hdr_ext_len - sizeof(*hop_ops);
	if (opt_len > pkt_len(pkt) || opt_len < 0)
		return;

	tprintf(" Hop Ops");

	pkt_pull(pkt, opt_len);
	pkt_set_proto(pkt, &eth_lay3, hop_ops->h_next_header);
}

struct protocol ipv6_hop_by_hop_ops = {
	.key = 0x0,
	.print_full = hop_by_hop,
	.print_less = hop_by_hop_less,
};
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>testing</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>selftests</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>sync</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-15 12:38:53 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-15 12:38:53 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>2d5a7101a140adcf7a5d8677649847fbb2dd5a2f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>02e3532964dd4c42aa6ea2187fee67e6dfee36dd</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>tools/testing/selftests/sync</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/sync?id=7f138b9706f5f3528d598aefd35337d54a8c1afb'>7f138b9706f5f3528d598aefd35337d54a8c1afb</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f&amp;id2=7f138b9706f5f3528d598aefd35337d54a8c1afb'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/sync?id=c7334ce814f7e5d8fc1f9b3126cda0640c2f81b3'>c7334ce814f7e5d8fc1f9b3126cda0640c2f81b3</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/sync?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f&amp;id2=c7334ce814f7e5d8fc1f9b3126cda0640c2f81b3'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'driver-core-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core</div><div class='commit-msg'>Pull driver core fix from Greg KH:
 "Here is a single patch being reverted to remove a feature that was
  added in 4.10-rc1 that isn't quite ready for release.

  It will be redone as a debugfs file instead of a sysfs file in the
  future"

* tag 'driver-core-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  Revert "driver core: Add deferred_probe attribute to devices in sysfs"
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2d5a7101a140adcf7a5d8677649847fbb2dd5a2f'>Diffstat</a> (limited to 'tools/testing/selftests/sync')</div><table summary='diffstat' class='diffstat'>