/*
 * 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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<option value='grep'>log msg</option>
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</td></tr></table>
<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='packet-loop-back'/><input type='hidden' name='id' value='529e71e16403830ae0d737a66c55c5f360f3576b'/><input type='hidden' name='id2' value='655548bf6271b212cd1e4c259da9dbe616348d38'/><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><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=packet-loop-back&amp;id=529e71e16403830ae0d737a66c55c5f360f3576b&amp;id2=655548bf6271b212cd1e4c259da9dbe616348d38'>Diffstat</a></div><table summary='diffstat' class='diffstat'>