File: [local] / src / usr.sbin / tcpdump / print-gre.c (download)
Revision 1.34, Mon Aug 17 07:09:25 2020 UTC (3 years, 9 months ago) by dlg
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8 Changes since 1.33: +63 -3 lines
add geneve option printing.
mostly modelled on the nsh md2 printing.
|
/* $OpenBSD: print-gre.c,v 1.34 2020/08/17 07:09:25 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
#define GRE_WCCP 0x883e
#define ERSPAN_II 0x88be
#define ERSPAN_III 0x22eb
struct wccp_redirect {
uint8_t flags;
#define WCCP_D (1 << 7)
#define WCCP_A (1 << 6)
uint8_t ServiceId;
uint8_t AltBucket;
uint8_t PriBucket;
};
void gre_print_0(const u_char *, u_int);
void gre_print_1(const u_char *, u_int);
void gre_print_pptp(const u_char *, u_int, uint16_t);
void gre_print_eoip(const u_char *, u_int, uint16_t);
void gre_print_erspan(uint16_t, const u_char *, u_int);
void gre_print_erspan3(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 *p, u_int length)
{
uint16_t vers;
int l;
l = snapend - p;
if (l < sizeof(vers)) {
printf("[|gre]");
return;
}
vers = EXTRACT_16BITS(p) & GRE_VERS;
switch (vers) {
case 0:
gre_print_0(p, length);
break;
case 1:
gre_print_1(p, length);
break;
default:
printf("gre-unknown-version=%u", vers);
break;
}
}
void
gre_print_0(const u_char *p, u_int length)
{
uint16_t flags, proto;
u_int l;
l = snapend - p;
flags = EXTRACT_16BITS(p);
p += sizeof(flags);
l -= sizeof(flags);
length -= sizeof(flags);
printf("gre");
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" : "");
}
if (l < sizeof(proto))
goto trunc;
proto = EXTRACT_16BITS(p);
p += sizeof(proto);
l -= sizeof(proto);
length -= sizeof(proto);
if (vflag)
printf(" %04x", proto);
if ((flags & GRE_CP) | (flags & GRE_RP)) {
if (l < 2)
goto trunc;
if ((flags & GRE_CP) && vflag)
printf(" sum 0x%x", EXTRACT_16BITS(p));
p += 2;
l -= 2;
length -= 2;
if (l < 2)
goto trunc;
if (flags & GRE_RP)
printf(" off 0x%x", EXTRACT_16BITS(p));
p += 2;
l -= 2;
length -= 2;
}
if (flags & GRE_KP) {
uint32_t key, vsid;
if (l < sizeof(key))
goto trunc;
key = EXTRACT_32BITS(p);
p += sizeof(key);
l -= sizeof(key);
length -= sizeof(key);
/* maybe NVGRE, or key entropy? */
vsid = (key & NVGRE_VSID_MASK) >> NVGRE_VSID_SHIFT;
printf(" key=%u|%u+%02x", key, vsid,
(key & NVGRE_FLOWID_MASK) >> NVGRE_FLOWID_SHIFT);
}
if (flags & GRE_SP) {
if (l < 4)
goto trunc;
printf(" seq %u", EXTRACT_32BITS(p));
p += 4;
l -= 4;
length -= 4;
}
if (flags & GRE_RP) {
for (;;) {
u_int16_t af;
u_int8_t sreoff;
u_int8_t srelen;
if (l < 4)
goto trunc;
af = EXTRACT_16BITS(p);
sreoff = *(p + 2);
srelen = *(p + 3);
p += 4;
l -= 4;
length -= 4;
if (af == 0 && srelen == 0)
break;
gre_sre_print(af, sreoff, srelen, p, l);
if (l < srelen)
goto trunc;
p += srelen;
l -= srelen;
length -= srelen;
}
}
printf(" ");
switch (packettype) {
case PT_ERSPAN:
gre_print_erspan(flags, p, length);
return;
default:
break;
}
switch (proto) {
case 0:
printf("keep-alive");
break;
case GRE_WCCP: {
printf("wccp ");
if (l == 0)
return;
if (*p >> 4 != 4) {
struct wccp_redirect *wccp;
if (l < sizeof(*wccp)) {
printf("[|wccp]");
return;
}
wccp = (struct wccp_redirect *)p;
printf("D:%c A:%c SId:%u Alt:%u Pri:%u",
(wccp->flags & WCCP_D) ? '1' : '0',
(wccp->flags & WCCP_A) ? '1' : '0',
wccp->ServiceId, wccp->AltBucket, wccp->PriBucket);
p += sizeof(*wccp);
l -= sizeof(*wccp);
printf(": ");
}
/* FALLTHROUGH */
}
case ETHERTYPE_IP:
ip_print(p, length);
break;
case ETHERTYPE_IPV6:
ip6_print(p, length);
break;
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MCAST:
mpls_print(p, length);
break;
case ETHERTYPE_TRANSETHER:
ether_tryprint(p, length, 0);
break;
#ifndef ETHERTYPE_NSH
#define ETHERTYPE_NSH 0x894f
#endif
case ETHERTYPE_NSH:
nsh_print(p, length);
break;
case ERSPAN_II:
gre_print_erspan(flags, p, length);
break;
case 0x2000:
cdp_print(p, length, l, 0);
break;
#ifndef ETHERTYPE_NHRP
#define ETHERTYPE_NHRP 0x2001
#endif
case ETHERTYPE_NHRP:
nhrp_print(p, length);
break;
default:
printf("unknown-proto-%04x", proto);
}
return;
trunc:
printf("[|gre]");
}
void
gre_print_1(const u_char *p, u_int length)
{
uint16_t flags, proto;
int l;
l = snapend - p;
flags = EXTRACT_16BITS(p);
p += sizeof(flags);
l -= sizeof(flags);
length -= sizeof(flags);
if (l < sizeof(proto))
goto trunc;
proto = EXTRACT_16BITS(p);
p += sizeof(proto);
l -= sizeof(proto);
length -= sizeof(proto);
switch (proto) {
case ETHERTYPE_PPP:
gre_print_pptp(p, length, flags);
break;
case 0x6400:
/* MikroTik RouterBoard Ethernet over IP (EoIP) */
gre_print_eoip(p, length, flags);
break;
default:
printf("unknown-gre1-proto-%04x", proto);
break;
}
return;
trunc:
printf("[|gre1]");
}
void
gre_print_pptp(const u_char *p, u_int length, uint16_t flags)
{
uint16_t len;
int l;
l = snapend - p;
printf("pptp");
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 (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;
}
/* GRE_KP */
if (l < sizeof(len))
goto trunc;
len = EXTRACT_16BITS(p);
p += sizeof(len);
l -= sizeof(len);
length -= sizeof(len);
if (vflag)
printf(" len %u", EXTRACT_16BITS(p));
if (l < 2)
goto trunc;
printf(" callid %u", EXTRACT_16BITS(p));
p += 2;
l -= 2;
length -= 2;
if (flags & GRE_SP) {
if (l < 4)
goto trunc;
printf(" seq %u", EXTRACT_32BITS(p));
p += 4;
l -= 4;
length -= 4;
}
if (flags & GRE_AP) {
if (l < 4)
goto trunc;
printf(" ack %u", EXTRACT_32BITS(p));
p += 4;
l -= 4;
length -= 4;
}
if ((flags & GRE_SP) == 0)
return;
if (length < len) {
printf(" truncated-pptp - %d bytes missing!",
len - length);
len = length;
}
printf(": ");
ppp_hdlc_print(p, len);
return;
trunc:
printf("[|pptp]");
}
void
gre_print_eoip(const u_char *p, u_int length, uint16_t flags)
{
uint16_t len, id;
int l;
l = snapend - p;
printf("eoip");
flags &= ~GRE_VERS;
if (flags != GRE_KP) {
printf(" unknown-eoip-flags-%04x!", flags);
return;
}
if (l < sizeof(len))
goto trunc;
len = EXTRACT_16BITS(p);
p += sizeof(len);
l -= sizeof(len);
length -= sizeof(len);
if (l < sizeof(id))
goto trunc;
id = EXTRACT_LE_16BITS(p);
p += sizeof(id);
l -= sizeof(id);
length -= sizeof(id);
if (vflag)
printf(" len=%u tunnel-id=%u", len, id);
else
printf(" %u", id);
if (length < len) {
printf(" truncated-eoip - %d bytes missing!",
len - length);
len = length;
}
printf(": ");
if (len == 0)
printf("keepalive");
else
ether_tryprint(p, len, 0);
return;
trunc:
printf("[|eoip]");
}
#define ERSPAN2_VER_SHIFT 28
#define ERSPAN2_VER_MASK (0xfU << ERSPAN2_VER_SHIFT)
#define ERSPAN2_VER (0x1U << ERSPAN2_VER_SHIFT)
#define ERSPAN2_VLAN_SHIFT 16
#define ERSPAN2_VLAN_MASK (0xfffU << ERSPAN2_VLAN_SHIFT)
#define ERSPAN2_COS_SHIFT 13
#define ERSPAN2_COS_MASK (0x7U << ERSPAN2_COS_SHIFT)
#define ERSPAN2_EN_SHIFT 11
#define ERSPAN2_EN_MASK (0x3U << ERSPAN2_EN_SHIFT)
#define ERSPAN2_EN_NONE (0x0U << ERSPAN2_EN_SHIFT)
#define ERSPAN2_EN_ISL (0x1U << ERSPAN2_EN_SHIFT)
#define ERSPAN2_EN_DOT1Q (0x2U << ERSPAN2_EN_SHIFT)
#define ERSPAN2_EN_VLAN (0x3U << ERSPAN2_EN_SHIFT)
#define ERSPAN2_T_SHIFT 10
#define ERSPAN2_T_MASK (0x1U << ERSPAN2_T_SHIFT)
#define ERSPAN2_SID_SHIFT 0
#define ERSPAN2_SID_MASK (0x3ffU << ERSPAN2_SID_SHIFT)
#define ERSPAN2_INDEX_SHIFT 0
#define ERSPAN2_INDEX_MASK (0xfffffU << ERSPAN2_INDEX_SHIFT)
void
gre_print_erspan(uint16_t flags, const u_char *bp, u_int len)
{
uint32_t hdr, ver, vlan, cos, en, sid, index;
u_int l;
printf("erspan");
if (!(flags & GRE_SP)) {
printf(" I: ");
ether_tryprint(bp, len, 0);
return;
}
l = snapend - bp;
if (l < sizeof(hdr))
goto trunc;
hdr = EXTRACT_32BITS(bp);
bp += sizeof(hdr);
l -= sizeof(hdr);
len -= sizeof(hdr);
ver = hdr & ERSPAN2_VER_MASK;
if (ver != ERSPAN2_VER) {
ver >>= ERSPAN2_VER_SHIFT;
printf(" erspan-unknown-version-%x", ver);
return;
}
if (vflag)
printf(" II");
sid = (hdr & ERSPAN2_SID_MASK) >> ERSPAN2_SID_SHIFT;
printf(" session %u", sid);
en = hdr & ERSPAN2_EN_MASK;
vlan = (hdr & ERSPAN2_VLAN_MASK) >> ERSPAN2_VLAN_SHIFT;
switch (en) {
case ERSPAN2_EN_NONE:
break;
case ERSPAN2_EN_ISL:
printf(" isl %u", vlan);
break;
case ERSPAN2_EN_DOT1Q:
printf(" vlan %u", vlan);
break;
case ERSPAN2_EN_VLAN:
printf(" vlan payload");
break;
}
if (vflag) {
cos = (hdr & ERSPAN2_COS_MASK) >> ERSPAN2_COS_SHIFT;
printf(" cos %u", cos);
if (hdr & ERSPAN2_T_MASK)
printf(" truncated");
}
if (l < sizeof(hdr))
goto trunc;
hdr = EXTRACT_32BITS(bp);
bp += sizeof(hdr);
l -= sizeof(hdr);
len -= sizeof(hdr);
if (vflag) {
index = (hdr & ERSPAN2_INDEX_MASK) >> ERSPAN2_INDEX_SHIFT;
printf(" index %u", index);
}
printf(": ");
ether_tryprint(bp, len, 0);
return;
trunc:
printf(" [|erspan]");
}
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;
}
}
/*
* - RFC 7348 Virtual eXtensible Local Area Network (VXLAN)
* - draft-ietf-nvo3-vxlan-gpe-08 Generic Protocol Extension for VXLAN
*/
struct vxlan_header {
uint16_t flags;
#define VXLAN_VER 0x3000 /* GPE */
#define VXLAN_VER_0 0x0000
#define VXLAN_I 0x0800 /* Instance Bit */
#define VXLAN_P 0x0400 /* GPE Next Protocol */
#define VXLAN_B 0x0200 /* GPE BUM Traffic */
#define VXLAN_O 0x0100 /* GPE OAM Flag */
uint8_t reserved;
uint8_t next_proto; /* GPE */
#define VXLAN_PROTO_RESERVED 0x00
#define VXLAN_PROTO_IPV4 0x01
#define VXLAN_PROTO_IPV6 0x02
#define VXLAN_PROTO_ETHERNET 0x03
#define VXLAN_PROTO_NSH 0x04
#define VXLAN_PROTO_MPLS 0x05
#define VXLAN_PROTO_VBNG 0x07
#define VXLAN_PROTO_GBP 0x80
#define VXLAN_PROTO_IOAM 0x82
uint32_t vni;
#define VXLAN_VNI_SHIFT 8
#define VXLAN_VNI_MASK (0xffffffU << VXLAN_VNI_SHIFT)
#define VXLAN_VNI_RESERVED (~VXLAN_VNI_MASK)
};
void
vxlan_print(const u_char *p, u_int length)
{
const struct vxlan_header *vh;
uint16_t flags, ver;
uint8_t proto = VXLAN_PROTO_ETHERNET;
int l = snapend - p;
printf("VXLAN");
if (l < sizeof(*vh))
goto trunc;
if (length < sizeof(*vh)) {
printf(" ip truncated");
return;
}
vh = (const struct vxlan_header *)p;
p += sizeof(*vh);
length -= sizeof(*vh);
flags = ntohs(vh->flags);
ver = flags & VXLAN_VER;
if (ver != VXLAN_VER_0) {
printf(" unknown version %u", ver >> 12);
return;
}
if (flags & VXLAN_I) {
uint32_t vni = (htonl(vh->vni) & VXLAN_VNI_MASK) >>
VXLAN_VNI_SHIFT;
printf(" vni %u", vni);
}
if (flags & VXLAN_P)
proto = vh->next_proto;
if (flags & VXLAN_B)
printf(" BUM");
if (flags & VXLAN_O) {
printf(" OAM (proto 0x%x, len %u)", proto, length);
return;
}
printf(": ");
switch (proto) {
case VXLAN_PROTO_RESERVED:
printf("Reserved");
break;
case VXLAN_PROTO_IPV4:
ip_print(p, length);
break;
case VXLAN_PROTO_IPV6:
ip6_print(p, length);
break;
case VXLAN_PROTO_ETHERNET:
ether_tryprint(p, length, 0);
break;
case VXLAN_PROTO_NSH:
nsh_print(p, length);
break;
case VXLAN_PROTO_MPLS:
mpls_print(p, length);
break;
default:
printf("Unassigned proto 0x%x", proto);
break;
}
return;
trunc:
printf(" [|vxlan]");
}
/*
* Geneve: Generic Network Virtualization Encapsulation
* draft-ietf-nvo3-geneve-16
*/
struct geneve_header {
uint16_t flags;
#define GENEVE_VER_SHIFT 14
#define GENEVE_VER_MASK (0x3U << GENEVE_VER_SHIFT)
#define GENEVE_VER_0 (0x0U << GENEVE_VER_SHIFT)
#define GENEVE_OPT_LEN_SHIFT 8
#define GENEVE_OPT_LEN_MASK (0x3fU << GENEVE_OPT_LEN_SHIFT)
#define GENEVE_OPT_LEN_UNITS 4
#define GENEVE_O 0x0080 /* Control packet */
#define GENEVE_C 0x0040 /* Critical options present */
uint16_t protocol;
uint32_t vni;
#define GENEVE_VNI_SHIFT 8
#define GENEVE_VNI_MASK (0xffffffU << GENEVE_VNI_SHIFT)
#define GENEVE_VNI_RESERVED (~GENEVE_VNI_MASK)
};
struct geneve_option {
uint16_t class;
uint8_t type;
uint8_t flags;
#define GENEVE_OPTION_LENGTH_SHIFT 0
#define GENEVE_OPTION_LENGTH_MASK (0x1fU << GENEVE_OPTION_LENGTH_SHIFT)
};
static void
geneve_options_print(const u_char *p, u_int l)
{
if (l == 0)
return;
do {
struct geneve_option *go;
unsigned int len, i;
if (l < sizeof(*go))
goto trunc;
go = (struct geneve_option *)p;
p += sizeof(*go);
l -= sizeof(*go);
printf("\n\toption class %u type %u", ntohs(go->class),
go->type);
len = (go->flags & GENEVE_OPTION_LENGTH_MASK) >>
GENEVE_OPTION_LENGTH_SHIFT;
if (len > 0) {
printf(":");
for (i = 0; i < len; i++) {
uint32_t w;
if (l < sizeof(w))
goto trunc;
w = EXTRACT_32BITS(p);
p += sizeof(w);
l -= sizeof(w);
printf(" %08x", w);
}
}
} while (l > 0);
return;
trunc:
printf("[|geneve option]");
}
void
geneve_print(const u_char *p, u_int length)
{
const struct geneve_header *gh;
uint16_t flags, ver, optlen, proto;
uint32_t vni;
int l = snapend - p;
printf("geneve");
if (l < sizeof(*gh))
goto trunc;
if (length < sizeof(*gh)) {
printf(" ip truncated");
return;
}
gh = (const struct geneve_header *)p;
p += sizeof(*gh);
l -= sizeof(*gh);
length -= sizeof(*gh);
flags = ntohs(gh->flags);
ver = flags & GENEVE_VER_MASK;
if (ver != GENEVE_VER_0) {
printf(" unknown version %u", ver >> GENEVE_VER_SHIFT);
return;
}
vni = (htonl(gh->vni) & GENEVE_VNI_MASK) >> GENEVE_VNI_SHIFT;
printf(" vni %u", vni);
if (flags & GENEVE_O)
printf(" Control");
if (flags & GENEVE_C)
printf(" Critical");
optlen = (flags & GENEVE_OPT_LEN_MASK) >> GENEVE_OPT_LEN_SHIFT;
optlen *= GENEVE_OPT_LEN_UNITS;
if (l < optlen)
goto trunc;
if (length < optlen) {
printf(" ip truncated");
return;
}
if (optlen > 0)
geneve_options_print(p, optlen);
p += optlen;
length -= optlen;
printf("\n ");
proto = ntohs(gh->protocol);
switch (proto) {
case ETHERTYPE_IP:
ip_print(p, length);
break;
case ETHERTYPE_IPV6:
ip6_print(p, length);
break;
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MCAST:
mpls_print(p, length);
break;
case ETHERTYPE_TRANSETHER:
ether_tryprint(p, length, 0);
break;
default:
printf("geneve-protocol-0x%x", proto);
break;
}
return;
trunc:
printf(" [|geneve]");
}