/*
 * 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 "lookup.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;
	const 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,
};
tion 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'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/bcache.txt?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/bcache.txt?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/bcache.txt'>Documentation/bcache.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/bcache.txt?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/bcache.txt?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/bcache.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/bcache.txt?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/Documentation/bcache.txt?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/Documentation/bcache.txt'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'Documentation/bcache.txt')</div><table summary='diffstat' class='diffstat'>