Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/tcpdump/print-gre.c	Lines:	0	182	0.0 %
Date:	2017-11-07	Branches:	0	107	0.0 %


/*	$OpenBSD: print-gre.c,v 1.12 2016/12/13 06:40:21 dlg Exp $	*/

/*
 * Copyright (c) 2002 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.
 */

/*
 * tcpdump filter for GRE - Generic Routing Encapsulation
 * RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE)
 */

#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>

#include <net/ethertypes.h>

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#define	GRE_CP		0x8000		/* checksum present */
#define	GRE_RP		0x4000		/* routing present */
#define	GRE_KP		0x2000		/* key present */
#define	GRE_SP		0x1000		/* sequence# present */
#define	GRE_sP		0x0800		/* source routing */
#define	GRE_RECRS	0x0700		/* recursion count */
#define	GRE_AP		0x0080		/* acknowledgment# present */
#define	GRE_VERS	0x0007		/* protocol version */

/* source route entry types */
#define	GRESRE_IP	0x0800		/* IP */
#define	GRESRE_ASN	0xfffe		/* ASN */

#define NVGRE_VSID_MASK		0xffffff00U
#define NVGRE_VSID_SHIFT	8
#define NVGRE_FLOWID_MASK	0x000000ffU
#define NVGRE_FLOWID_SHIFT	0

void gre_print_0(const u_char *, u_int);
void gre_print_1(const u_char *, u_int);
void gre_sre_print(u_int16_t, u_int8_t, u_int8_t, const u_char *, u_int);
void gre_sre_ip_print(u_int8_t, u_int8_t, const u_char *, u_int);
void gre_sre_asn_print(u_int8_t, u_int8_t, const u_char *, u_int);

void
gre_print(const u_char *bp, u_int length)
{
	u_int len = length, vers;

	if (bp + len > snapend)
		len = snapend - bp;

	if (len < 2) {
		printf("[|gre]");
		return;
	}
	vers = EXTRACT_16BITS(bp) & GRE_VERS;

	switch (vers) {
	case 0:
		gre_print_0(bp, len);
		break;
	case 1:
		gre_print_1(bp, len);
		break;
	default:
		printf("gre-unknown-version=%u", vers);
		break;
	}
}

void
gre_print_0(const u_char *bp, u_int length)
{
	u_int len = length;
	u_int16_t flags, prot;

	flags = EXTRACT_16BITS(bp);
	if (vflag) {
		printf("[%s%s%s%s%s] ",
		    (flags & GRE_CP) ? "C" : "",
		    (flags & GRE_RP) ? "R" : "",
		    (flags & GRE_KP) ? "K" : "",
		    (flags & GRE_SP) ? "S" : "",
		    (flags & GRE_sP) ? "s" : "");
	}

	len -= 2;
	bp += 2;

	if (len < 2)
		goto trunc;
	prot = EXTRACT_16BITS(bp);
	printf("%s", etherproto_string(prot));

	len -= 2;
	bp += 2;

	if ((flags & GRE_CP) | (flags & GRE_RP)) {
		if (len < 2)
			goto trunc;
		if (vflag)
			printf(" sum 0x%x", EXTRACT_16BITS(bp));
		bp += 2;
		len -= 2;

		if (len < 2)
			goto trunc;
		printf(" off 0x%x", EXTRACT_16BITS(bp));
		bp += 2;
		len -= 2;
	}

	if (flags & GRE_KP) {
		uint32_t key, vsid;

		if (len < 4)
			goto trunc;
		key = EXTRACT_32BITS(bp);

		/* maybe NVGRE? */
		if (flags == (GRE_KP | 0) && prot == ETHERTYPE_TRANSETHER) {
			vsid = (key & NVGRE_VSID_MASK) >> NVGRE_VSID_SHIFT;
			printf(" NVGRE vsid=%u (0x%x)+flowid=0x%02x /",
			    vsid, vsid,
			    (key & NVGRE_FLOWID_MASK) >> NVGRE_FLOWID_SHIFT);
		}
		printf(" key=%u (0x%x)", key, key);
		bp += 4;
		len -= 4;
	}

	if (flags & GRE_SP) {
		if (len < 4)
			goto trunc;
		printf(" seq %u", EXTRACT_32BITS(bp));
		bp += 4;
		len -= 4;
	}

	if (flags & GRE_RP) {
		for (;;) {
			u_int16_t af;
			u_int8_t sreoff;
			u_int8_t srelen;

			if (len < 4)
				goto trunc;
			af = EXTRACT_16BITS(bp);
			sreoff = *(bp + 2);
			srelen = *(bp + 3);
			bp += 4;
			len -= 4;

			if (af == 0 && srelen == 0)
				break;

			gre_sre_print(af, sreoff, srelen, bp, len);

			if (len < srelen)
				goto trunc;
			bp += srelen;
			len -= srelen;
		}
	}

	printf(": ");

	switch (prot) {
	case ETHERTYPE_IP:
		ip_print(bp, len);
		break;
	case ETHERTYPE_IPV6:
		ip6_print(bp, len);
		break;
	case ETHERTYPE_MPLS:
		mpls_print(bp, len);
		break;
	case ETHERTYPE_TRANSETHER:
		ether_print(bp, len);
		break;
	default:
		printf("gre-proto-0x%x", prot);
	}
	return;

trunc:
	printf("[|gre]");
}

void
gre_print_1(const u_char *bp, u_int length)
{
	u_int len = length;
	u_int16_t flags, prot;

	flags = EXTRACT_16BITS(bp);
	len -= 2;
	bp += 2;

	if (vflag) {
		printf("[%s%s%s%s%s%s]",
		    (flags & GRE_CP) ? "C" : "",
		    (flags & GRE_RP) ? "R" : "",
		    (flags & GRE_KP) ? "K" : "",
		    (flags & GRE_SP) ? "S" : "",
		    (flags & GRE_sP) ? "s" : "",
		    (flags & GRE_AP) ? "A" : "");
	}

	if (len < 2)
		goto trunc;
	prot = EXTRACT_16BITS(bp);
	len -= 2;
	bp += 2;

	if (flags & GRE_CP) {
		printf(" cpset!");
		return;
	}
	if (flags & GRE_RP) {
		printf(" rpset!");
		return;
	}
	if ((flags & GRE_KP) == 0) {
		printf(" kpunset!");
		return;
	}
	if (flags & GRE_sP) {
		printf(" spset!");
		return;
	}

	if (flags & GRE_KP) {
		u_int32_t k;

		if (len < 4)
			goto trunc;
		k = EXTRACT_32BITS(bp);
		printf(" call %d", k & 0xffff);
		len -= 4;
		bp += 4;
	}

	if (flags & GRE_SP) {
		if (len < 4)
			goto trunc;
		printf(" seq %u", EXTRACT_32BITS(bp));
		bp += 4;
		len -= 4;
	}

	if (flags & GRE_AP) {
		if (len < 4)
			goto trunc;
		printf(" ack %u", EXTRACT_32BITS(bp));
		bp += 4;
		len -= 4;
	}

	if ((flags & GRE_SP) == 0) {
		printf(" no-payload");
		return;
	}

	printf(": ");

	switch (prot) {
	case ETHERTYPE_PPP:
		printf("gre-ppp-payload");
		break;
	default:
		printf("gre-proto-0x%x", prot);
		break;
	}
	return;

trunc:
	printf("[|gre]");
}

void
gre_sre_print(u_int16_t af, u_int8_t sreoff, u_int8_t srelen,
    const u_char *bp, u_int len)
{
	switch (af) {
	case GRESRE_IP:
		printf(" (rtaf=ip");
		gre_sre_ip_print(sreoff, srelen, bp, len);
		printf(")");
		break;
	case GRESRE_ASN:
		printf(" (rtaf=asn");
		gre_sre_asn_print(sreoff, srelen, bp, len);
		printf(")");
		break;
	default:
		printf(" (rtaf=0x%x)", af);
	}
}
void
gre_sre_ip_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
{
	struct in_addr a;
	const u_char *up = bp;

	if (sreoff & 3) {
		printf(" badoffset=%u", sreoff);
		return;
	}
	if (srelen & 3) {
		printf(" badlength=%u", srelen);
		return;
	}
	if (sreoff >= srelen) {
		printf(" badoff/len=%u/%u", sreoff, srelen);
		return;
	}

	for (;;) {
		if (len < 4 || srelen == 0)
			return;

		memcpy(&a, bp, sizeof(a));
		printf(" %s%s",
		    ((bp - up) == sreoff) ? "*" : "",
		    inet_ntoa(a));

		bp += 4;
		len -= 4;
		srelen -= 4;
	}
}

void
gre_sre_asn_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
{
	const u_char *up = bp;

	if (sreoff & 1) {
		printf(" badoffset=%u", sreoff);
		return;
	}
	if (srelen & 1) {
		printf(" badlength=%u", srelen);
		return;
	}
	if (sreoff >= srelen) {
		printf(" badoff/len=%u/%u", sreoff, srelen);
		return;
	}

	for (;;) {
		if (len < 2 || srelen == 0)
			return;

		printf(" %s%x",
		    ((bp - up) == sreoff) ? "*" : "",
		    EXTRACT_16BITS(bp));

		bp += 2;
		len -= 2;
		srelen -= 2;
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: print-gre.c,v 1.12 2016/12/13 06:40:21 dlg Exp $ */
2
3			/*
4			* Copyright (c) 2002 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			/*
30			* tcpdump filter for GRE - Generic Routing Encapsulation
31			* RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE)
32			*/
33
34			#include <sys/time.h>
35			#include <sys/uio.h>
36			#include <sys/socket.h>
37
38			#include <netinet/in.h>
39			#include <netinet/ip.h>
40			#include <arpa/inet.h>
41
42			#include <net/ethertypes.h>
43
44			#include <stdio.h>
45			#include <string.h>
46
47			#include "interface.h"
48			#include "addrtoname.h"
49			#include "extract.h"
50
51			#define GRE_CP 0x8000 /* checksum present */
52			#define GRE_RP 0x4000 /* routing present */
53			#define GRE_KP 0x2000 /* key present */
54			#define GRE_SP 0x1000 /* sequence# present */
55			#define GRE_sP 0x0800 /* source routing */
56			#define GRE_RECRS 0x0700 /* recursion count */
57			#define GRE_AP 0x0080 /* acknowledgment# present */
58			#define GRE_VERS 0x0007 /* protocol version */
59
60			/* source route entry types */
61			#define GRESRE_IP 0x0800 /* IP */
62			#define GRESRE_ASN 0xfffe /* ASN */
63
64			#define NVGRE_VSID_MASK 0xffffff00U
65			#define NVGRE_VSID_SHIFT 8
66			#define NVGRE_FLOWID_MASK 0x000000ffU
67			#define NVGRE_FLOWID_SHIFT 0
68
69			void gre_print_0(const u_char *, u_int);
70			void gre_print_1(const u_char *, u_int);
71			void gre_sre_print(u_int16_t, u_int8_t, u_int8_t, const u_char *, u_int);
72			void gre_sre_ip_print(u_int8_t, u_int8_t, const u_char *, u_int);
73			void gre_sre_asn_print(u_int8_t, u_int8_t, const u_char *, u_int);
74
75			void
76			gre_print(const u_char *bp, u_int length)
77			{
78			u_int len = length, vers;
79
80			if (bp + len > snapend)
81			len = snapend - bp;
82
83			if (len < 2) {
84			printf("[\|gre]");
85			return;
86			}
87			vers = EXTRACT_16BITS(bp) & GRE_VERS;
88
89			switch (vers) {
90			case 0:
91			gre_print_0(bp, len);
92			break;
93			case 1:
94			gre_print_1(bp, len);
95			break;
96			default:
97			printf("gre-unknown-version=%u", vers);
98			break;
99			}
100			}
101
102			void
103			gre_print_0(const u_char *bp, u_int length)
104			{
105			u_int len = length;
106			u_int16_t flags, prot;
107
108			flags = EXTRACT_16BITS(bp);
109			if (vflag) {
110			printf("[%s%s%s%s%s] ",
111			(flags & GRE_CP) ? "C" : "",
112			(flags & GRE_RP) ? "R" : "",
113			(flags & GRE_KP) ? "K" : "",
114			(flags & GRE_SP) ? "S" : "",
115			(flags & GRE_sP) ? "s" : "");
116			}
117
118			len -= 2;
119			bp += 2;
120
121			if (len < 2)
122			goto trunc;
123			prot = EXTRACT_16BITS(bp);
124			printf("%s", etherproto_string(prot));
125
126			len -= 2;
127			bp += 2;
128
129			if ((flags & GRE_CP) \| (flags & GRE_RP)) {
130			if (len < 2)
131			goto trunc;
132			if (vflag)
133			printf(" sum 0x%x", EXTRACT_16BITS(bp));
134			bp += 2;
135			len -= 2;
136
137			if (len < 2)
138			goto trunc;
139			printf(" off 0x%x", EXTRACT_16BITS(bp));
140			bp += 2;
141			len -= 2;
142			}
143
144			if (flags & GRE_KP) {
145			uint32_t key, vsid;
146
147			if (len < 4)
148			goto trunc;
149			key = EXTRACT_32BITS(bp);
150
151			/* maybe NVGRE? */
152			if (flags == (GRE_KP \| 0) && prot == ETHERTYPE_TRANSETHER) {
153			vsid = (key & NVGRE_VSID_MASK) >> NVGRE_VSID_SHIFT;
154			printf(" NVGRE vsid=%u (0x%x)+flowid=0x%02x /",
155			vsid, vsid,
156			(key & NVGRE_FLOWID_MASK) >> NVGRE_FLOWID_SHIFT);
157			}
158			printf(" key=%u (0x%x)", key, key);
159			bp += 4;
160			len -= 4;
161			}
162
163			if (flags & GRE_SP) {
164			if (len < 4)
165			goto trunc;
166			printf(" seq %u", EXTRACT_32BITS(bp));
167			bp += 4;
168			len -= 4;
169			}
170
171			if (flags & GRE_RP) {
172			for (;;) {
173			u_int16_t af;
174			u_int8_t sreoff;
175			u_int8_t srelen;
176
177			if (len < 4)
178			goto trunc;
179			af = EXTRACT_16BITS(bp);
180			sreoff = *(bp + 2);
181			srelen = *(bp + 3);
182			bp += 4;
183			len -= 4;
184
185			if (af == 0 && srelen == 0)
186			break;
187
188			gre_sre_print(af, sreoff, srelen, bp, len);
189
190			if (len < srelen)
191			goto trunc;
192			bp += srelen;
193			len -= srelen;
194			}
195			}
196
197			printf(": ");
198
199			switch (prot) {
200			case ETHERTYPE_IP:
201			ip_print(bp, len);
202			break;
203			case ETHERTYPE_IPV6:
204			ip6_print(bp, len);
205			break;
206			case ETHERTYPE_MPLS:
207			mpls_print(bp, len);
208			break;
209			case ETHERTYPE_TRANSETHER:
210			ether_print(bp, len);
211			break;
212			default:
213			printf("gre-proto-0x%x", prot);
214			}
215			return;
216
217			trunc:
218			printf("[\|gre]");
219			}
220
221			void
222			gre_print_1(const u_char *bp, u_int length)
223			{
224			u_int len = length;
225			u_int16_t flags, prot;
226
227			flags = EXTRACT_16BITS(bp);
228			len -= 2;
229			bp += 2;
230
231			if (vflag) {
232			printf("[%s%s%s%s%s%s]",
233			(flags & GRE_CP) ? "C" : "",
234			(flags & GRE_RP) ? "R" : "",
235			(flags & GRE_KP) ? "K" : "",
236			(flags & GRE_SP) ? "S" : "",
237			(flags & GRE_sP) ? "s" : "",
238			(flags & GRE_AP) ? "A" : "");
239			}
240
241			if (len < 2)
242			goto trunc;
243			prot = EXTRACT_16BITS(bp);
244			len -= 2;
245			bp += 2;
246
247			if (flags & GRE_CP) {
248			printf(" cpset!");
249			return;
250			}
251			if (flags & GRE_RP) {
252			printf(" rpset!");
253			return;
254			}
255			if ((flags & GRE_KP) == 0) {
256			printf(" kpunset!");
257			return;
258			}
259			if (flags & GRE_sP) {
260			printf(" spset!");
261			return;
262			}
263
264			if (flags & GRE_KP) {
265			u_int32_t k;
266
267			if (len < 4)
268			goto trunc;
269			k = EXTRACT_32BITS(bp);
270			printf(" call %d", k & 0xffff);
271			len -= 4;
272			bp += 4;
273			}
274
275			if (flags & GRE_SP) {
276			if (len < 4)
277			goto trunc;
278			printf(" seq %u", EXTRACT_32BITS(bp));
279			bp += 4;
280			len -= 4;
281			}
282
283			if (flags & GRE_AP) {
284			if (len < 4)
285			goto trunc;
286			printf(" ack %u", EXTRACT_32BITS(bp));
287			bp += 4;
288			len -= 4;
289			}
290
291			if ((flags & GRE_SP) == 0) {
292			printf(" no-payload");
293			return;
294			}
295
296			printf(": ");
297
298			switch (prot) {
299			case ETHERTYPE_PPP:
300			printf("gre-ppp-payload");
301			break;
302			default:
303			printf("gre-proto-0x%x", prot);
304			break;
305			}
306			return;
307
308			trunc:
309			printf("[\|gre]");
310			}
311
312			void
313			gre_sre_print(u_int16_t af, u_int8_t sreoff, u_int8_t srelen,
314			const u_char *bp, u_int len)
315			{
316			switch (af) {
317			case GRESRE_IP:
318			printf(" (rtaf=ip");
319			gre_sre_ip_print(sreoff, srelen, bp, len);
320			printf(")");
321			break;
322			case GRESRE_ASN:
323			printf(" (rtaf=asn");
324			gre_sre_asn_print(sreoff, srelen, bp, len);
325			printf(")");
326			break;
327			default:
328			printf(" (rtaf=0x%x)", af);
329			}
330			}
331			void
332			gre_sre_ip_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
333			{
334			struct in_addr a;
335			const u_char *up = bp;
336
337			if (sreoff & 3) {
338			printf(" badoffset=%u", sreoff);
339			return;
340			}
341			if (srelen & 3) {
342			printf(" badlength=%u", srelen);
343			return;
344			}
345			if (sreoff >= srelen) {
346			printf(" badoff/len=%u/%u", sreoff, srelen);
347			return;
348			}
349
350			for (;;) {
351			if (len < 4 \|\| srelen == 0)
352			return;
353
354			memcpy(&a, bp, sizeof(a));
355			printf(" %s%s",
356			((bp - up) == sreoff) ? "*" : "",
357			inet_ntoa(a));
358
359			bp += 4;
360			len -= 4;
361			srelen -= 4;
362			}
363			}
364
365			void
366			gre_sre_asn_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
367			{
368			const u_char *up = bp;
369
370			if (sreoff & 1) {
371			printf(" badoffset=%u", sreoff);
372			return;
373			}
374			if (srelen & 1) {
375			printf(" badlength=%u", srelen);
376			return;
377			}
378			if (sreoff >= srelen) {
379			printf(" badoff/len=%u/%u", sreoff, srelen);
380			return;
381			}
382
383			for (;;) {
384			if (len < 2 \|\| srelen == 0)
385			return;
386
387			printf(" %s%x",
388			((bp - up) == sreoff) ? "*" : "",
389			EXTRACT_16BITS(bp));
390
391			bp += 2;
392			len -= 2;
393			srelen -= 2;
394			}
395			}