/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Copyright 2018 Markus Amend
 * Subject to the GPL, version 2.
 */

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

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

struct dccphdr {
	uint16_t source;
	uint16_t dest;
	uint8_t data_offs;
	uint8_t cc_cscov;
	uint16_t checks;
#if defined(__LITTLE_ENDIAN_BITFIELD)
        __extension__ uint32_t x:1,
                               type:4,
                               res:3,
                               sqnr:24;
#elif defined (__BIG_ENDIAN_BITFIELD)
	__extension__ uint32_t res:3,
			       type:4,
			       x:1,
			       sqnr:24;
#else
# error "Please fix <asm/byteorder.h>"
#endif

} __packed;

struct dccpexthdr {
        uint32_t seqnr_low;
} __packed;

struct ack_subhdr {
        uint32_t res:8,
		 acknr_low: 24;
} __packed;

struct ack_extsubhdr {
        uint16_t res;
	uint16_t acknr_high;
	uint32_t acknr_low;
} __packed;

static char* dccp_pkt_type(uint8_t type) {
	switch(type) {
	case 0: return "Request";
	case 1: return "Response";
	case 2: return "Data";
	case 3: return "Ack";
	case 4: return "DataAck";
	case 5: return "CloseReq";
	case 6: return "Close";
	case 7: return "Reset";
	case 8: return "Sync";
	case 9: return "SyncAck";
	case 10 ... 15: return "Reserved";
	}
	return "Undef";
}

static void dccp(struct pkt_buff *pkt)
{
	struct dccphdr *dccp = (struct dccphdr *) pkt_pull(pkt, sizeof(*dccp));
	struct dccpexthdr *dccpext = NULL;
	struct ack_subhdr *ack = NULL;
	struct ack_extsubhdr *ackext = NULL;
	uint16_t src, dest;
	uint64_t seqnr;
	int64_t acknr = -1;
	size_t used_hdr = 0;

	if (dccp == NULL)
		return;

	used_hdr += sizeof(*dccp);

	seqnr = (uint64_t) ntohl(dccp->sqnr);

	/* check for extended sequence number */
	if (dccp->x) {
		dccpext = (struct dccpexthdr *) pkt_pull(pkt, sizeof(*dccpext));
		if (dccpext == NULL)
			return;

		used_hdr += sizeof(*dccpext);
		seqnr = (((uint64_t) seqnr)<<24) | ntohl(dccpext->seqnr_low);
	}

	/* check for ack header */
	if (dccp->type == 1 || (dccp->type >= 2 && dccp->type <= 9)) {
		if (dccp->x) {
			/* Extended ack header */
			ackext = (struct ack_extsubhdr *) pkt_pull(pkt, sizeof(*ackext));
			if (ackext == NULL)
	                        return;

			used_hdr += sizeof(*ackext);
			acknr = (((uint64_t) ntohs(ackext->acknr_high))<<32) |
				ntohl(ackext->acknr_low);
		} else {
			/* standard ack header */
			ack = (struct ack_subhdr *) pkt_pull(pkt, sizeof(*ack));
                        if (ack == NULL)
                                return;

			used_hdr += sizeof(*ack);
			acknr = ntohl((uint32_t) ack->acknr_low);
		}
	}

	src = ntohs(dccp->source);
	dest = ntohs(dccp->dest);

	tprintf(" [ DCCP ");
	tprintf("Port (%u", src);
	tprintf(" => %u", dest);
	tprintf("), ");
	tprintf("Header Len (%u Bytes), ", dccp->data_offs * 4);
	tprintf("Type: %s, ", dccp_pkt_type((uint8_t) dccp->type));
	tprintf("Seqnr:%lu", seqnr);
	if (acknr > 0)
		tprintf(", AckNr:%lu", acknr);
	tprintf(" ]\n");
}

static void dccp_less(struct pkt_buff *pkt)
{
	struct dccphdr *dccp = (struct dccphdr *) pkt_pull(pkt, sizeof(*dccp));
	uint16_t src, dest;

	if (dccp == NULL)
		return;

	src = ntohs(dccp->source);
	dest = ntohs(dccp->dest);

	tprintf(" DCCP %u", src);
	tprintf("/%u", dest);
}

struct protocol dccp_ops = {
	.key = 0x21,
	.print_full = dccp,
	.print_less = dccp_less,
};
n><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'>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/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>net/mac802154/rx.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac802154/rx.c?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba&amp;id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac802154/rx.c?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba&amp;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/net/mac802154/rx.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/net/mac802154/rx.c'>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/?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>Diffstat</a> (limited to 'net/mac802154/rx.c')</div><table summary='diffstat' class='diffstat'>