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

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

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

struct fragmhdr {
	uint8_t h_fragm_next_header;
	uint8_t h_fragm_reserved;
	uint16_t h_fragm_off_res_M;	
	uint32_t h_fragm_identification;
} __packed;

static void fragm(struct pkt_buff *pkt)
{
	uint16_t off_res_M;
	struct fragmhdr *fragm_ops;

	fragm_ops = (struct fragmhdr *) pkt_pull(pkt, sizeof(*fragm_ops));
	if (fragm_ops == NULL)
		return;

	off_res_M = ntohs(fragm_ops->h_fragm_off_res_M);
	
	tprintf("\t [ Fragment ");
	tprintf("NextHdr (%u), ", fragm_ops->h_fragm_next_header);
	tprintf("Reserved (%u), ", fragm_ops->h_fragm_reserved);
	tprintf("Offset (%u), ", off_res_M >> 3);
	tprintf("Res (%u), ", (off_res_M >> 1) & 0x3);
	tprintf("M flag (%u), ", off_res_M & 0x1);
	tprintf("Identification (%u)",
		ntohl(fragm_ops->h_fragm_identification));
	tprintf(" ]\n");

	pkt_set_dissector(pkt, &eth_lay3, fragm_ops->h_fragm_next_header);
}

static void fragm_less(struct pkt_buff *pkt)
{
	uint16_t off_res_M;
	struct fragmhdr *fragm_ops;

	fragm_ops = (struct fragmhdr *) pkt_pull(pkt, sizeof(*fragm_ops));
	if (fragm_ops == NULL)
		return;

	off_res_M = ntohs(fragm_ops->h_fragm_off_res_M);

	tprintf(" FragmOffs %u", off_res_M >> 3);

	pkt_set_dissector(pkt, &eth_lay3, fragm_ops->h_fragm_next_header);
}

struct protocol ipv6_fragm_ops = {
	.key = 0x2C,
	.print_full = fragm,
	.print_less = fragm_less,
};
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dsa?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>dsa</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dsa/slave.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>slave.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/dsa/slave.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2017-02-07 13:48:22 -0500'>2017-02-07</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=e69e46261063a25c3907bed16a2e9d18b115d1fd'>net: dsa: Do not clobber PHY link outside of state machine</a></td><td>Florian Fainelli</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2017-02-06 16:53:29 -0500'>2017-02-06</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=04d3a4c6af52a58370795bc9f70dc15f51f8bb84'>net: dsa: introduce bridge notifier</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-11</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2017-02-06 16:53:29 -0500'>2017-02-06</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=c5d35cb32cffa6e4c2db1cbd9a544e10a8d6fda9'>net: dsa: change state setter scope</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2017-02-06 16:53:28 -0500'>2017-02-06</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=9c26542685130ef3b55cdb4e04eec0ac33376b41'>net: dsa: rollback bridging on error</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+13</span></td></tr>
<tr><td><span title='2017-02-06 16:53:28 -0500'>2017-02-06</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=8e92ab3a426e04dc355b196e3b4474f633025a3b'>net: dsa: simplify netdevice events handling</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-28</span>/<span class='insertions'>+16</span></td></tr>
<tr><td><span title='2017-02-06 16:53:28 -0500'>2017-02-06</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/slave.c?id=88e4f0ca4e4e7760e4aad544789c5408219886d5'>net: dsa: move netdevice notifier registration</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+20</span></td></tr>