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

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

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

struct arphdr {
	uint16_t ar_hrd;   /* format of hardware address */
	uint16_t ar_pro;   /* format of protocol address */
	uint8_t ar_hln;    /* length of hardware address */
	uint8_t ar_pln;    /* length of protocol address */
	uint16_t ar_op;    /* ARP opcode (command)       */
	uint8_t ar_sha[6]; /* sender hardware address    */
	uint8_t ar_sip[4]; /* sender IP address          */
	uint8_t ar_tha[6]; /* target hardware address    */
	uint8_t ar_tip[4]; /* target IP address          */
} __packed;

#define ARPHRD_ETHER	1
#define ARPHRD_IEEE802	6
#define ARPHRD_ARCNET	7
#define ARPHRD_ATM	16
#define ARPHRD_ATM2	19
#define ARPHRD_SERIAL	20
#define ARPHRD_ATM3	21
#define ARPHRD_IEEE1394	24

#define ARPOP_REQUEST   1  /* ARP request                */
#define ARPOP_REPLY     2  /* ARP reply                  */
#define ARPOP_RREQUEST  3  /* RARP request               */
#define ARPOP_RREPLY    4  /* RARP reply                 */
#define ARPOP_InREQUEST 8  /* InARP request              */
#define ARPOP_InREPLY   9  /* InARP reply                */
#define ARPOP_NAK       10 /* (ATM)ARP NAK               */

static void arp(struct pkt_buff *pkt)
{
	char *hrd;
	char *pro;
	char *opcode;
	struct arphdr *arp = (struct arphdr *) pkt_pull(pkt, sizeof(*arp));

	if (arp == NULL)
		return;

	switch (ntohs(arp->ar_hrd)) {
	case ARPHRD_ETHER:
		hrd = "Ethernet";
		break;
	case ARPHRD_IEEE802:
		hrd = "IEEE 802";
		break;
	case ARPHRD_ARCNET:
		hrd = "ARCNET";
		break;
	case ARPHRD_ATM:
	case ARPHRD_ATM2:
	case ARPHRD_ATM3:
		hrd = "ATM";
		break;
	case ARPHRD_SERIAL:
		hrd = "Serial Line";
		break;
	case ARPHRD_IEEE1394:
		hrd = "IEEE 1394.1995";
		break;
	default:
		hrd = "Unknown";
		break;
	}

	pro = lookup_ether_type(ntohs(arp->ar_pro));
	if (pro == NULL)
		pro = "Unknown";

	switch (ntohs(arp->ar_op)) {
	case ARPOP_REQUEST:
		opcode = "ARP request";
		break;
	case ARPOP_REPLY:
		opcode = "ARP reply";
		break;
	case ARPOP_RREQUEST:
		opcode = "RARP request";
		break;
	case ARPOP_RREPLY:
		opcode = "RARP reply";
		break;
	case ARPOP_InREQUEST:
		opcode = "InARP request";
		break;
	case ARPOP_InREPLY:
		opcode = "InARP reply";
		break;
	case ARPOP_NAK:
		opcode = "(ATM) ARP NAK";
		break;
	default:
		opcode = "Unknown";
		break;
	};

	tprintf(" [ ARP ");
	tprintf("Format HA (%u => %s), ", ntohs(arp->ar_hrd), hrd);
	tprintf("Format Proto (0x%.4x => %s), ", ntohs(arp->ar_pro), pro);
	tprintf("HA Len (%u), ", arp->ar_hln);
	tprintf("Proto Len (%u), ", arp->ar_pln);
	tprintf("Opcode (%u => %s)", ntohs(arp->ar_op), opcode);
	tprintf(" ]\n");
}

static void arp_less(struct pkt_buff *pkt)
{
	char *opcode = NULL;
	struct arphdr *arp = (struct arphdr *) pkt_pull(pkt, sizeof(*arp));

	if (arp == NULL)
		return;

	switch (ntohs(arp->ar_op)) {
	case ARPOP_REQUEST:
		opcode = "ARP request";
		break;
	case ARPOP_REPLY:
		opcode = "ARP reply";
		break;
	case ARPOP_RREQUEST:
		opcode = "RARP request";
		break;
	case ARPOP_RREPLY:
		opcode = "RARP reply";
		break;
	case ARPOP_InREQUEST:
		opcode = "InARP request";
		break;
	case ARPOP_InREPLY:
		opcode = "InARP reply";
		break;
	case ARPOP_NAK:
		opcode = "(ATM) ARP NAK";
		break;
	default:
		opcode = "Unknown";
		break;
	};

	tprintf(" Op %s", opcode);
}

struct protocol arp_ops = {
	.key = 0x0806,
	.print_full = arp,
	.print_less = arp_less,
};
02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=dd41d33f0b033885211a5d6f3ee19e73238aa9ee'>openvswitch: Add force commit.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+24</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc'>openvswitch: Add original direction conntrack tuple to sw_flow_key.</a></td><td>Jarno Rajahalme</td><td>7</td><td><span class='deletions'>-46</span>/<span class='insertions'>+227</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=09aa98ad496d6b11a698b258bc64d7f64c55d682'>openvswitch: Inherit master's labels.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-14</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=6ffcea79957df43caeaa6d1de5062556a5afc262'>openvswitch: Refactor labels initialization.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-42</span>/<span class='insertions'>+62</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=b87cec3814ccc7f6afb0a1378ee7e5110d07cdd3'>openvswitch: Simplify labels length logic.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-11</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=cb80d58fae76d8ea93555149b2b16e19b89a1f4f'>openvswitch: Unionize ovs_key_ct_label with a u32 array.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=193e30967897f3a8b6f9f137ac30571d832c2c5c'>openvswitch: Do not trigger events for unconfirmed connections.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=9ff464db50e437eef131f719cc2e9902eea9c607'>openvswitch: Use inverted tuple in ovs_ct_find_existing() if NATted.</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2017-02-09 22:59:34 -0500'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=5e17da634a21b1200853fe82ba67d6571f2beabe'>openvswitch: Fix comments for skb-&gt;_nfct</a></td><td>Jarno Rajahalme</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+7</span></td></tr>
<tr><td><span title='2017-02-03 16:58:20 -0500'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=52e01b84a244473074fc0612c169e2e043d58b01'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next</a></td><td>David S. Miller</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+5</span></td></tr>
<tr><td><span title='2017-02-02 14:31:54 +0100'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=c74454fadd5ea6fc866ffe2c417a0dba56b2bf1c'>netfilter: add and use nf_ct_set helper</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2017-02-02 14:31:53 +0100'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/openvswitch?id=cb9c68363efb6d1f950ec55fb06e031ee70db5fc'>skbuff: add and use skb_nfct helper</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+3</span></td></tr>