* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.71 2002-12-11 07:14:01 guy Exp $ (LBL)";
-#endif
+/* \summary: Internet Control Message Protocol (ICMP) printer */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
-#include "extract.h" /* must come after interface.h */
+#include "extract.h"
#include "ip.h"
#include "udp.h"
+#include "ipproto.h"
+#include "mpls.h"
/*
* Interface Control Message Protocol Definitions.
* Structure of an icmp header.
*/
struct icmp {
- u_int8_t icmp_type; /* type of message, see below */
- u_int8_t icmp_code; /* type sub code */
- u_int16_t icmp_cksum; /* ones complement cksum of struct */
+ nd_uint8_t icmp_type; /* type of message, see below */
+ nd_uint8_t icmp_code; /* type sub code */
+ nd_uint16_t icmp_cksum; /* ones complement cksum of struct */
union {
- u_int8_t ih_pptr; /* ICMP_PARAMPROB */
- struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
+ nd_uint8_t ih_pptr; /* ICMP_PARAMPROB */
+ nd_ipv4 ih_gwaddr; /* ICMP_REDIRECT */
struct ih_idseq {
- u_int16_t icd_id;
- u_int16_t icd_seq;
+ nd_uint16_t icd_id;
+ nd_uint16_t icd_seq;
} ih_idseq;
- u_int32_t ih_void;
-
- /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
- struct ih_pmtu {
- u_int16_t ipm_void;
- u_int16_t ipm_nextmtu;
- } ih_pmtu;
+ nd_uint32_t ih_void;
} icmp_hun;
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_id icmp_hun.ih_idseq.icd_id
#define icmp_seq icmp_hun.ih_idseq.icd_seq
#define icmp_void icmp_hun.ih_void
-#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
-#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
union {
struct id_ts {
- u_int32_t its_otime;
- u_int32_t its_rtime;
- u_int32_t its_ttime;
+ nd_uint32_t its_otime;
+ nd_uint32_t its_rtime;
+ nd_uint32_t its_ttime;
} id_ts;
struct id_ip {
struct ip idi_ip;
/* options and then 64 bits of data */
} id_ip;
- u_int32_t id_mask;
- u_int8_t id_data[1];
+ nd_uint32_t id_mask;
+ nd_byte id_data[1];
} icmp_dun;
#define icmp_otime icmp_dun.id_ts.its_otime
#define icmp_rtime icmp_dun.id_ts.its_rtime
#define icmp_data icmp_dun.id_data
};
+#define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
+#define ICMP_MPLS_EXT_VERSION 2
+
/*
* Lower bounds on packet lengths for various types.
* For the error advice packets must first insure that the
* ip header length.
*/
#define ICMP_MINLEN 8 /* abs minimum */
-#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
+#define ICMP_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-internet-icmp-08 */
+#define ICMP_TSLEN (8 + 3 * sizeof (uint32_t)) /* timestamp */
#define ICMP_MASKLEN 12 /* address mask */
#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
#define ICMP_MAXTYPE 18
-#define ICMP_INFOTYPE(type) \
- ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
- (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
- (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
- (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
- (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
+#define ICMP_ERRTYPE(type) \
+ ((type) == ICMP_UNREACH || (type) == ICMP_SOURCEQUENCH || \
+ (type) == ICMP_REDIRECT || (type) == ICMP_TIMXCEED || \
+ (type) == ICMP_PARAMPROB)
+#define ICMP_MPLS_EXT_TYPE(type) \
+ ((type) == ICMP_UNREACH || \
+ (type) == ICMP_TIMXCEED || \
+ (type) == ICMP_PARAMPROB)
/* rfc1700 */
#ifndef ICMP_UNREACH_NET_UNKNOWN
#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
#endif
/* Most of the icmp types */
-static struct tok icmp2str[] = {
+static const struct tok icmp2str[] = {
{ ICMP_ECHOREPLY, "echo reply" },
{ ICMP_SOURCEQUENCH, "source quench" },
{ ICMP_ECHO, "echo request" },
{ 0, NULL }
};
-/* Formats for most of the ICMP_UNREACH codes */
-static struct tok unreach2str[] = {
- { ICMP_UNREACH_NET, "net %s unreachable" },
- { ICMP_UNREACH_HOST, "host %s unreachable" },
- { ICMP_UNREACH_SRCFAIL,
- "%s unreachable - source route failed" },
- { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
- { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
- { ICMP_UNREACH_ISOLATED,
- "%s unreachable - source host isolated" },
- { ICMP_UNREACH_NET_PROHIB,
- "net %s unreachable - admin prohibited" },
- { ICMP_UNREACH_HOST_PROHIB,
- "host %s unreachable - admin prohibited" },
- { ICMP_UNREACH_TOSNET,
- "net %s unreachable - tos prohibited" },
- { ICMP_UNREACH_TOSHOST,
- "host %s unreachable - tos prohibited" },
- { ICMP_UNREACH_FILTER_PROHIB,
- "host %s unreachable - admin prohibited filter" },
- { ICMP_UNREACH_HOST_PRECEDENCE,
- "host %s unreachable - host precedence violation" },
- { ICMP_UNREACH_PRECEDENCE_CUTOFF,
- "host %s unreachable - precedence cutoff" },
- { 0, NULL }
-};
-
-/* Formats for the ICMP_REDIRECT codes */
-static struct tok type2str[] = {
- { ICMP_REDIRECT_NET, "redirect %s to net %s" },
- { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
- { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
- { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
- { 0, NULL }
-};
-
/* rfc1191 */
struct mtu_discovery {
- u_int16_t unused;
- u_int16_t nexthopmtu;
+ nd_uint16_t unused;
+ nd_uint16_t nexthopmtu;
};
/* rfc1256 */
struct ih_rdiscovery {
- u_int8_t ird_addrnum;
- u_int8_t ird_addrsiz;
- u_int16_t ird_lifetime;
+ nd_uint8_t ird_addrnum;
+ nd_uint8_t ird_addrsiz;
+ nd_uint16_t ird_lifetime;
};
struct id_rdiscovery {
- u_int32_t ird_addr;
- u_int32_t ird_pref;
+ nd_uint32_t ird_addr;
+ nd_uint32_t ird_pref;
};
+/*
+ * draft-bonica-internet-icmp-08
+ *
+ * The Destination Unreachable, Time Exceeded
+ * and Parameter Problem messages are slightly changed as per
+ * the above draft. A new Length field gets added to give
+ * the caller an idea about the length of the piggypacked
+ * IP packet before the MPLS extension header starts.
+ *
+ * The Length field represents length of the padded "original datagram"
+ * field measured in 32-bit words.
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type | Code | Checksum |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | unused | Length | unused |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Internet Header + leading octets of original datagram |
+ * | |
+ * | // |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+struct icmp_ext_t {
+ nd_uint8_t icmp_type;
+ nd_uint8_t icmp_code;
+ nd_uint16_t icmp_checksum;
+ nd_byte icmp_reserved;
+ nd_uint8_t icmp_length;
+ nd_byte icmp_reserved2[2];
+ nd_byte icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
+ nd_byte icmp_ext_version_res[2];
+ nd_uint16_t icmp_ext_checksum;
+ nd_byte icmp_ext_data[1];
+};
+
+struct icmp_mpls_ext_object_header_t {
+ nd_uint16_t length;
+ nd_uint8_t class_num;
+ nd_uint8_t ctype;
+};
+
+static const struct tok icmp_mpls_ext_obj_values[] = {
+ { 1, "MPLS Stack Entry" },
+ { 2, "Extended Payload" },
+ { 0, NULL}
+};
+
+/* prototypes */
+const char *icmp_tstamp_print(u_int);
+
+/* print the milliseconds since midnight UTC */
+const char *
+icmp_tstamp_print(u_int tstamp)
+{
+ u_int msec,sec,min,hrs;
+
+ static char buf[64];
+
+ msec = tstamp % 1000;
+ sec = tstamp / 1000;
+ min = sec / 60; sec -= min * 60;
+ hrs = min / 60; min -= hrs * 60;
+ snprintf(buf, sizeof(buf), "%02u:%02u:%02u.%03u",hrs,min,sec,msec);
+ return buf;
+}
+
void
-icmp_print(const u_char *bp, u_int plen, const u_char *bp2)
+icmp_print(netdissect_options *ndo, const u_char *bp, u_int plen, const u_char *bp2,
+ int fragmented)
{
char *cp;
const struct icmp *dp;
+ uint8_t icmp_type, icmp_code;
+ const struct icmp_ext_t *ext_dp;
const struct ip *ip;
- const char *str, *fmt;
+ const char *str;
const struct ip *oip;
+ uint8_t ip_proto;
const struct udphdr *ouh;
- u_int hlen, dport, mtu;
+ const uint8_t *obj_tptr;
+ uint32_t raw_label;
+ const u_char *snapend_save;
+ const struct icmp_mpls_ext_object_header_t *icmp_mpls_ext_object_header;
+ u_int hlen, mtu, obj_tlen, obj_class_num, obj_ctype;
+ uint16_t dport;
char buf[MAXHOSTNAMELEN + 100];
+ struct cksum_vec vec[1];
- dp = (struct icmp *)bp;
- ip = (struct ip *)bp2;
+ ndo->ndo_protocol = "icmp";
+ dp = (const struct icmp *)bp;
+ ext_dp = (const struct icmp_ext_t *)bp;
+ ip = (const struct ip *)bp2;
str = buf;
- TCHECK(dp->icmp_code);
- switch (dp->icmp_type) {
+ icmp_type = GET_U_1(dp->icmp_type);
+ icmp_code = GET_U_1(dp->icmp_code);
+ switch (icmp_type) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
- TCHECK(dp->icmp_seq);
- (void)snprintf(buf, sizeof(buf), "echo %s seq %u",
- dp->icmp_type == ICMP_ECHO ?
- "request" : "reply",
- EXTRACT_16BITS(&dp->icmp_seq));
+ (void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u",
+ icmp_type == ICMP_ECHO ?
+ "request" : "reply",
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq));
break;
case ICMP_UNREACH:
- TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ switch (icmp_code) {
+
+ case ICMP_UNREACH_NET:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
case ICMP_UNREACH_PROTOCOL:
- TCHECK(dp->icmp_ip.ip_p);
(void)snprintf(buf, sizeof(buf),
- "%s protocol %d unreachable",
- ipaddr_string(&dp->icmp_ip.ip_dst),
- dp->icmp_ip.ip_p);
+ "%s protocol %u unreachable",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_U_1(dp->icmp_ip.ip_p));
break;
case ICMP_UNREACH_PORT:
- TCHECK(dp->icmp_ip.ip_p);
+ ND_TCHECK_1(dp->icmp_ip.ip_p);
oip = &dp->icmp_ip;
hlen = IP_HL(oip) * 4;
- ouh = (struct udphdr *)(((u_char *)oip) + hlen);
- dport = EXTRACT_16BITS(&ouh->uh_dport);
- switch (oip->ip_p) {
+ ouh = (const struct udphdr *)(((const u_char *)oip) + hlen);
+ dport = GET_BE_U_2(ouh->uh_dport);
+ ip_proto = GET_U_1(oip->ip_p);
+ switch (ip_proto) {
case IPPROTO_TCP:
(void)snprintf(buf, sizeof(buf),
"%s tcp port %s unreachable",
- ipaddr_string(&oip->ip_dst),
- tcpport_string(dport));
+ GET_IPADDR_STRING(oip->ip_dst),
+ tcpport_string(ndo, dport));
break;
case IPPROTO_UDP:
(void)snprintf(buf, sizeof(buf),
"%s udp port %s unreachable",
- ipaddr_string(&oip->ip_dst),
- udpport_string(dport));
+ GET_IPADDR_STRING(oip->ip_dst),
+ udpport_string(ndo, dport));
break;
default:
(void)snprintf(buf, sizeof(buf),
- "%s protocol %d port %d unreachable",
- ipaddr_string(&oip->ip_dst),
- oip->ip_p, dport);
+ "%s protocol %u port %u unreachable",
+ GET_IPADDR_STRING(oip->ip_dst),
+ ip_proto, dport);
break;
}
break;
case ICMP_UNREACH_NEEDFRAG:
{
- register const struct mtu_discovery *mp;
- mp = (struct mtu_discovery *)&dp->icmp_void;
- mtu = EXTRACT_16BITS(&mp->nexthopmtu);
+ const struct mtu_discovery *mp;
+ mp = (const struct mtu_discovery *)(const u_char *)&dp->icmp_void;
+ mtu = GET_BE_U_2(mp->nexthopmtu);
if (mtu) {
(void)snprintf(buf, sizeof(buf),
- "%s unreachable - need to frag (mtu %d)",
- ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
+ "%s unreachable - need to frag (mtu %u)",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst), mtu);
} else {
(void)snprintf(buf, sizeof(buf),
"%s unreachable - need to frag",
- ipaddr_string(&dp->icmp_ip.ip_dst));
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
}
}
break;
+ case ICMP_UNREACH_SRCFAIL:
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - source route failed",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_NET_UNKNOWN:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - unknown",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_UNKNOWN:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - unknown",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_ISOLATED:
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - source host isolated",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_NET_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - admin prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - admin prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_TOSNET:
+ (void)snprintf(buf, sizeof(buf),
+ "net %s unreachable - tos prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_TOSHOST:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - tos prohibited",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_FILTER_PROHIB:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - admin prohibited filter",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_HOST_PRECEDENCE:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - host precedence violation",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
+ case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+ (void)snprintf(buf, sizeof(buf),
+ "host %s unreachable - precedence cutoff",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
+ break;
+
default:
- fmt = tok2str(unreach2str, "#%d %%s unreachable",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(&dp->icmp_ip.ip_dst));
+ (void)snprintf(buf, sizeof(buf),
+ "%s unreachable - #%u",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ icmp_code);
break;
}
break;
case ICMP_REDIRECT:
- TCHECK(dp->icmp_ip.ip_dst);
- fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(&dp->icmp_ip.ip_dst),
- ipaddr_string(&dp->icmp_gwaddr));
+ switch (icmp_code) {
+
+ case ICMP_REDIRECT_NET:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect %s to net %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_HOST:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect %s to host %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_TOSNET:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-tos %s to net %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ case ICMP_REDIRECT_TOSHOST:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-tos %s to host %s",
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+
+ default:
+ (void)snprintf(buf, sizeof(buf),
+ "redirect-#%u %s to %s", icmp_code,
+ GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
+ GET_IPADDR_STRING(dp->icmp_gwaddr));
+ break;
+ }
break;
case ICMP_ROUTERADVERT:
{
- register const struct ih_rdiscovery *ihp;
- register const struct id_rdiscovery *idp;
+ const struct ih_rdiscovery *ihp;
+ const struct id_rdiscovery *idp;
u_int lifetime, num, size;
(void)snprintf(buf, sizeof(buf), "router advertisement");
cp = buf + strlen(buf);
- ihp = (struct ih_rdiscovery *)&dp->icmp_void;
- TCHECK(*ihp);
+ ihp = (const struct ih_rdiscovery *)&dp->icmp_void;
+ ND_TCHECK_SIZE(ihp);
(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
cp = buf + strlen(buf);
- lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
+ lifetime = GET_BE_U_2(ihp->ird_lifetime);
if (lifetime < 60) {
(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
lifetime);
}
cp = buf + strlen(buf);
- num = ihp->ird_addrnum;
- (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
+ num = GET_U_1(ihp->ird_addrnum);
+ (void)snprintf(cp, sizeof(buf) - (cp - buf), " %u:", num);
cp = buf + strlen(buf);
- size = ihp->ird_addrsiz;
+ size = GET_U_1(ihp->ird_addrsiz);
if (size != 2) {
(void)snprintf(cp, sizeof(buf) - (cp - buf),
- " [size %d]", size);
+ " [size %u]", size);
break;
}
- idp = (struct id_rdiscovery *)&dp->icmp_data;
- while (num-- > 0) {
- TCHECK(*idp);
+ idp = (const struct id_rdiscovery *)&dp->icmp_data;
+ while (num > 0) {
+ ND_TCHECK_SIZE(idp);
(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
- ipaddr_string(&idp->ird_addr),
- EXTRACT_32BITS(&idp->ird_pref));
+ GET_IPADDR_STRING(idp->ird_addr),
+ GET_BE_U_4(idp->ird_pref));
cp = buf + strlen(buf);
++idp;
+ num--;
}
}
break;
case ICMP_TIMXCEED:
- TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ ND_TCHECK_4(dp->icmp_ip.ip_dst);
+ switch (icmp_code) {
case ICMP_TIMXCEED_INTRANS:
str = "time exceeded in-transit";
break;
default:
- (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
- dp->icmp_code);
+ (void)snprintf(buf, sizeof(buf), "time exceeded-#%u",
+ icmp_code);
break;
}
break;
case ICMP_PARAMPROB:
- if (dp->icmp_code)
+ if (icmp_code)
(void)snprintf(buf, sizeof(buf),
- "parameter problem - code %d", dp->icmp_code);
+ "parameter problem - code %u", icmp_code);
else {
- TCHECK(dp->icmp_pptr);
(void)snprintf(buf, sizeof(buf),
- "parameter problem - octet %d", dp->icmp_pptr);
+ "parameter problem - octet %u",
+ GET_U_1(dp->icmp_pptr));
}
break;
case ICMP_MASKREPLY:
- TCHECK(dp->icmp_mask);
(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
- EXTRACT_32BITS(&dp->icmp_mask));
+ GET_BE_U_4(dp->icmp_mask));
break;
case ICMP_TSTAMP:
- TCHECK(dp->icmp_seq);
(void)snprintf(buf, sizeof(buf),
"time stamp query id %u seq %u",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq));
break;
case ICMP_TSTAMPREPLY:
- TCHECK(dp->icmp_ttime);
+ ND_TCHECK_4(dp->icmp_ttime);
(void)snprintf(buf, sizeof(buf),
- "time stamp reply id %u seq %u : org 0x%x recv 0x%x xmit 0x%x",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq),
- EXTRACT_32BITS(&dp->icmp_otime),
- EXTRACT_32BITS(&dp->icmp_rtime),
- EXTRACT_32BITS(&dp->icmp_ttime));
- break;
+ "time stamp reply id %u seq %u: org %s",
+ GET_BE_U_2(dp->icmp_id),
+ GET_BE_U_2(dp->icmp_seq),
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_otime)));
+
+ (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s",
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_rtime)));
+ (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s",
+ icmp_tstamp_print(GET_BE_U_4(dp->icmp_ttime)));
+ break;
default:
- str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
+ str = tok2str(icmp2str, "type-#%u", icmp_type);
break;
}
- (void)printf("icmp %d: %s", plen, str);
- if (vflag) {
- u_int16_t sum, icmp_sum;
- if (TTEST2(*bp, plen)) {
- sum = in_cksum((u_short*)dp, plen, 0);
+ ND_PRINT("ICMP %s, length %u", str, plen);
+ if (ndo->ndo_vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
+ if (ND_TTEST_LEN(bp, plen)) {
+ uint16_t sum;
+
+ vec[0].ptr = (const uint8_t *)(const void *)dp;
+ vec[0].len = plen;
+ sum = in_cksum(vec, 1);
if (sum != 0) {
- icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
- (void)printf(" (wrong icmp cksum %x (->%x)!)",
+ uint16_t icmp_sum = GET_BE_U_2(dp->icmp_cksum);
+ ND_PRINT(" (wrong icmp cksum %x (->%x)!)",
icmp_sum,
in_cksum_shouldbe(icmp_sum, sum));
}
}
}
- if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
+
+ /*
+ * print the remnants of the IP packet.
+ * save the snaplength as this may get overidden in the IP printer.
+ */
+ if (ndo->ndo_vflag >= 1 && ICMP_ERRTYPE(icmp_type)) {
bp += 8;
- (void)printf(" for ");
- ip = (struct ip *)bp;
- snaplen = snapend - bp;
- ip_print(bp, EXTRACT_16BITS(&ip->ip_len));
+ ND_PRINT("\n\t");
+ ip = (const struct ip *)bp;
+ snapend_save = ndo->ndo_snapend;
+ ip_print(ndo, bp, GET_BE_U_2(ip->ip_len));
+ ndo->ndo_snapend = snapend_save;
}
+
+ /* ndo_protocol reassignment after ip_print() call */
+ ndo->ndo_protocol = "icmp";
+
+ /*
+ * Attempt to decode the MPLS extensions only for some ICMP types.
+ */
+ if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(icmp_type)) {
+
+ ND_TCHECK_SIZE(ext_dp);
+
+ /*
+ * Check first if the mpls extension header shows a non-zero length.
+ * If the length field is not set then silently verify the checksum
+ * to check if an extension header is present. This is expedient,
+ * however not all implementations set the length field proper.
+ */
+ if (GET_U_1(ext_dp->icmp_length) == 0 &&
+ ND_TTEST_LEN(ext_dp->icmp_ext_version_res, plen - ICMP_EXTD_MINLEN)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
+ vec[0].len = plen - ICMP_EXTD_MINLEN;
+ if (in_cksum(vec, 1)) {
+ return;
+ }
+ }
+
+ ND_PRINT("\n\tMPLS extension v%u",
+ ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
+
+ /*
+ * Sanity checking of the header.
+ */
+ if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
+ ICMP_MPLS_EXT_VERSION) {
+ ND_PRINT(" packet not supported");
+ return;
+ }
+
+ hlen = plen - ICMP_EXTD_MINLEN;
+ if (ND_TTEST_LEN(ext_dp->icmp_ext_version_res, hlen)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
+ vec[0].len = hlen;
+ ND_PRINT(", checksum 0x%04x (%scorrect), length %u",
+ GET_BE_U_2(ext_dp->icmp_ext_checksum),
+ in_cksum(vec, 1) ? "in" : "",
+ hlen);
+ }
+
+ hlen -= 4; /* subtract common header size */
+ obj_tptr = (const uint8_t *)ext_dp->icmp_ext_data;
+
+ while (hlen > sizeof(struct icmp_mpls_ext_object_header_t)) {
+
+ icmp_mpls_ext_object_header = (const struct icmp_mpls_ext_object_header_t *)obj_tptr;
+ ND_TCHECK_SIZE(icmp_mpls_ext_object_header);
+ obj_tlen = GET_BE_U_2(icmp_mpls_ext_object_header->length);
+ obj_class_num = GET_U_1(icmp_mpls_ext_object_header->class_num);
+ obj_ctype = GET_U_1(icmp_mpls_ext_object_header->ctype);
+ obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t);
+
+ ND_PRINT("\n\t %s Object (%u), Class-Type: %u, length %u",
+ tok2str(icmp_mpls_ext_obj_values,"unknown",obj_class_num),
+ obj_class_num,
+ obj_ctype,
+ obj_tlen);
+
+ hlen-=sizeof(struct icmp_mpls_ext_object_header_t); /* length field includes tlv header */
+
+ /* infinite loop protection */
+ if ((obj_class_num == 0) ||
+ (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))) {
+ return;
+ }
+ obj_tlen-=sizeof(struct icmp_mpls_ext_object_header_t);
+
+ switch (obj_class_num) {
+ case 1:
+ switch(obj_ctype) {
+ case 1:
+ raw_label = GET_BE_U_4(obj_tptr);
+ ND_PRINT("\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label));
+ if (MPLS_STACK(raw_label))
+ ND_PRINT(", [S]");
+ ND_PRINT(", ttl %u", MPLS_TTL(raw_label));
+ break;
+ default:
+ print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
+ }
+ break;
+
+ /*
+ * FIXME those are the defined objects that lack a decoder
+ * you are welcome to contribute code ;-)
+ */
+ case 2:
+ default:
+ print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
+ break;
+ }
+ if (hlen < obj_tlen)
+ break;
+ hlen -= obj_tlen;
+ obj_tptr += obj_tlen;
+ }
+ }
+
return;
trunc:
- fputs("[|icmp]", stdout);
+ nd_print_trunc(ndo);
}
projects / tcpdump / blobdiff