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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/tcpdump/print-mpls.c	Lines:	0	44	0.0 %
Date:	2017-11-13	Branches:	0	34	0.0 %


/*	$OpenBSD: print-mpls.c,v 1.3 2016/07/11 00:27:50 rzalamena Exp $	*/

/*
 * Copyright (c) 2005 Jason L. Wright (jason@thought.net)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/socket.h>
#include <sys/types.h>
#include <netmpls/mpls.h>

#include <stdio.h>

#include "interface.h"
#include "extract.h"		    /* must come after interface.h */

#define CW_SEQUENCE_MASK       (0x0000ffffU)

int controlword_tryprint(const u_char **, u_int *);

void
mpls_print(const u_char *bp, u_int len)
{
	u_int32_t tag, label, exp, bottom, ttl;
	int has_cw;

 again:
	if (bp + sizeof(tag) > snapend)
		goto trunc;

	tag = EXTRACT_32BITS(bp);
	bp += sizeof(tag);
	len -= sizeof(tag);

	label = (tag >> 12) & 0xfffff;
	exp = (tag >> 9) & 0x7;
	bottom = (tag >> 8) & 0x1;
	ttl = (tag >> 0) & 0xff;

	printf("MPLS(label %u, exp %u, ttl %u) ", label, exp, ttl);

	/* XXX decode "Router Alert Label" */

	if (!bottom)
		goto again;

	/* Handle pseudowire control word. */
	has_cw = controlword_tryprint(&bp, &len);

	/*
	 * guessing the underlying protocol is about all we can do if
	 * it's not explicitly defined.
	 */

	switch (label) {
	case 0x00000:			/* IPv4 Explicit NULL */
		ip_print(bp, len);
		break;
	case 0x00001:			/* Router Alert */
		/* shouldn't happen at stack bottom */
		printf("Route-Alert");
		break;
	case 0x00002:			/* IPv6 Explicit NULL */
		ip6_print(bp, len);
		break;
	case 0x00003:			/* Implicit NULL */
		/* shouldn't happen in the tag stack */
		printf("Implicit-NULL");
		break;

	case 0x00004:			/* reserved labels */
	case 0x00005:
	case 0x00006:
	case 0x00007:
	case 0x00008:
	case 0x00009:
	case 0x0000a:
	case 0x0000b:
	case 0x0000c:
	case 0x0000d:
	case 0x0000e:
	case 0x0000f:
		break;

	default:			/* dunno, guess? */
		if (len == 0)
			break;
		if (bp >= snapend)
			goto trunc;

		switch (bp[0] & 0xf0) {
		case 0x40:
			ip_print(bp, len);
			break;
		case 0x60:
			ip6_print(bp, len);
			break;
		}
	}

	if (has_cw)
		ether_tryprint(bp, len, 0);

	return;
trunc:
	printf("[|mpls]");
}

/* Print control word if any and returns 1 on success. */
int
controlword_tryprint(const u_char **bp, u_int *lenp)
{
	uint32_t cw, frag, seq;

	if (*lenp < 4)
		return (0);

	cw = EXTRACT_32BITS(*bp);
	if (cw & CW_ZERO_MASK)
		return (0);

	*bp += sizeof(cw);
	*lenp += sizeof(cw);

	frag = (cw & CW_FRAG_MASK) >> 16;
	seq = cw & CW_SEQUENCE_MASK;

	printf("CW(frag %u, sequence %u) ", frag, seq);

	return (1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: print-mpls.c,v 1.3 2016/07/11 00:27:50 rzalamena Exp $ */
2
3			/*
4			* Copyright (c) 2005 Jason L. Wright (jason@thought.net)
5			* All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			*
16			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18			* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19			* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20			* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21			* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22			* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25			* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26			* POSSIBILITY OF SUCH DAMAGE.
27			*/
28
29			#include <sys/socket.h>
30			#include <sys/types.h>
31			#include <netmpls/mpls.h>
32
33			#include <stdio.h>
34
35			#include "interface.h"
36			#include "extract.h" /* must come after interface.h */
37
38			#define CW_SEQUENCE_MASK (0x0000ffffU)
39
40			int controlword_tryprint(const u_char *, u_int );
41
42			void
43			mpls_print(const u_char *bp, u_int len)
44			{
45			u_int32_t tag, label, exp, bottom, ttl;
46			int has_cw;
47
48			again:
49			if (bp + sizeof(tag) > snapend)
50			goto trunc;
51
52			tag = EXTRACT_32BITS(bp);
53			bp += sizeof(tag);
54			len -= sizeof(tag);
55
56			label = (tag >> 12) & 0xfffff;
57			exp = (tag >> 9) & 0x7;
58			bottom = (tag >> 8) & 0x1;
59			ttl = (tag >> 0) & 0xff;
60
61			printf("MPLS(label %u, exp %u, ttl %u) ", label, exp, ttl);
62
63			/* XXX decode "Router Alert Label" */
64
65			if (!bottom)
66			goto again;
67
68			/* Handle pseudowire control word. */
69			has_cw = controlword_tryprint(&bp, &len);
70
71			/*
72			* guessing the underlying protocol is about all we can do if
73			* it's not explicitly defined.
74			*/
75
76			switch (label) {
77			case 0x00000: /* IPv4 Explicit NULL */
78			ip_print(bp, len);
79			break;
80			case 0x00001: /* Router Alert */
81			/* shouldn't happen at stack bottom */
82			printf("Route-Alert");
83			break;
84			case 0x00002: /* IPv6 Explicit NULL */
85			ip6_print(bp, len);
86			break;
87			case 0x00003: /* Implicit NULL */
88			/* shouldn't happen in the tag stack */
89			printf("Implicit-NULL");
90			break;
91
92			case 0x00004: /* reserved labels */
93			case 0x00005:
94			case 0x00006:
95			case 0x00007:
96			case 0x00008:
97			case 0x00009:
98			case 0x0000a:
99			case 0x0000b:
100			case 0x0000c:
101			case 0x0000d:
102			case 0x0000e:
103			case 0x0000f:
104			break;
105
106			default: /* dunno, guess? */
107			if (len == 0)
108			break;
109			if (bp >= snapend)
110			goto trunc;
111
112			switch (bp[0] & 0xf0) {
113			case 0x40:
114			ip_print(bp, len);
115			break;
116			case 0x60:
117			ip6_print(bp, len);
118			break;
119			}
120			}
121
122			if (has_cw)
123			ether_tryprint(bp, len, 0);
124
125			return;
126			trunc:
127			printf("[\|mpls]");
128			}
129
130			/* Print control word if any and returns 1 on success. */
131			int
132			controlword_tryprint(const u_char *bp, u_int lenp)
133			{
134			uint32_t cw, frag, seq;
135
136			if (*lenp < 4)
137			return (0);
138
139			cw = EXTRACT_32BITS(*bp);
140			if (cw & CW_ZERO_MASK)
141			return (0);
142
143			*bp += sizeof(cw);
144			*lenp += sizeof(cw);
145
146			frag = (cw & CW_FRAG_MASK) >> 16;
147			seq = cw & CW_SEQUENCE_MASK;
148
149			printf("CW(frag %u, sequence %u) ", frag, seq);
150
151			return (1);
152			}