* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: Internet Control Message Protocol (ICMP) printer */
+
#ifdef HAVE_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"
* Structure of an icmp header.
*/
struct icmp {
- uint8_t icmp_type; /* type of message, see below */
- uint8_t icmp_code; /* type sub code */
- uint16_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 {
- uint8_t ih_pptr; /* ICMP_PARAMPROB */
+ nd_uint8_t ih_pptr; /* ICMP_PARAMPROB */
struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
struct ih_idseq {
- uint16_t icd_id;
- uint16_t icd_seq;
+ nd_uint16_t icd_id;
+ nd_uint16_t icd_seq;
} ih_idseq;
- uint32_t ih_void;
+ nd_uint32_t ih_void;
} icmp_hun;
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_void icmp_hun.ih_void
union {
struct id_ts {
- uint32_t its_otime;
- uint32_t its_rtime;
- uint32_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;
- uint32_t id_mask;
- uint8_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
/* rfc1191 */
struct mtu_discovery {
- uint16_t unused;
- uint16_t nexthopmtu;
+ nd_uint16_t unused;
+ nd_uint16_t nexthopmtu;
};
/* rfc1256 */
struct ih_rdiscovery {
- uint8_t ird_addrnum;
- uint8_t ird_addrsiz;
- uint16_t ird_lifetime;
+ nd_uint8_t ird_addrnum;
+ nd_uint8_t ird_addrsiz;
+ nd_uint16_t ird_lifetime;
};
struct id_rdiscovery {
- uint32_t ird_addr;
- uint32_t ird_pref;
+ nd_uint32_t ird_addr;
+ nd_uint32_t ird_pref;
};
/*
*/
struct icmp_ext_t {
- uint8_t icmp_type;
- uint8_t icmp_code;
- uint8_t icmp_checksum[2];
- uint8_t icmp_reserved;
- uint8_t icmp_length;
- uint8_t icmp_reserved2[2];
- uint8_t icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
- uint8_t icmp_ext_version_res[2];
- uint8_t icmp_ext_checksum[2];
- uint8_t icmp_ext_data[1];
+ 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 {
- uint8_t length[2];
- uint8_t class_num;
- uint8_t ctype;
+ nd_uint16_t length;
+ nd_uint8_t class_num;
+ nd_uint8_t ctype;
};
static const struct tok icmp_mpls_ext_obj_values[] = {
{
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 struct ip *oip;
+ uint8_t ip_proto;
const struct udphdr *ouh;
const uint8_t *obj_tptr;
uint32_t raw_label;
str = buf;
ND_TCHECK(dp->icmp_code);
- switch (dp->icmp_type) {
+ icmp_type = EXTRACT_U_1(dp->icmp_type);
+ icmp_code = EXTRACT_U_1(dp->icmp_code);
+ switch (icmp_type) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
ND_TCHECK(dp->icmp_seq);
(void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u",
- dp->icmp_type == ICMP_ECHO ?
+ icmp_type == ICMP_ECHO ?
"request" : "reply",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
+ EXTRACT_BE_U_2(dp->icmp_id),
+ EXTRACT_BE_U_2(dp->icmp_seq));
break;
case ICMP_UNREACH:
ND_TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ switch (icmp_code) {
case ICMP_UNREACH_PROTOCOL:
- ND_TCHECK(dp->icmp_ip.ip_p);
+ ND_TCHECK_1(dp->icmp_ip.ip_p);
(void)snprintf(buf, sizeof(buf),
"%s protocol %d unreachable",
ipaddr_string(ndo, &dp->icmp_ip.ip_dst),
- dp->icmp_ip.ip_p);
+ EXTRACT_U_1(dp->icmp_ip.ip_p));
break;
case ICMP_UNREACH_PORT:
hlen = IP_HL(oip) * 4;
ouh = (const struct udphdr *)(((const u_char *)oip) + hlen);
ND_TCHECK(ouh->uh_dport);
- dport = EXTRACT_16BITS(&ouh->uh_dport);
- switch (oip->ip_p) {
+ dport = EXTRACT_BE_U_2(ouh->uh_dport);
+ ip_proto = EXTRACT_U_1(oip->ip_p);
+ switch (ip_proto) {
case IPPROTO_TCP:
(void)snprintf(buf, sizeof(buf),
"%s tcp port %s unreachable",
ipaddr_string(ndo, &oip->ip_dst),
- tcpport_string(dport));
+ tcpport_string(ndo, dport));
break;
case IPPROTO_UDP:
(void)snprintf(buf, sizeof(buf),
"%s udp port %s unreachable",
ipaddr_string(ndo, &oip->ip_dst),
- udpport_string(dport));
+ udpport_string(ndo, dport));
break;
default:
(void)snprintf(buf, sizeof(buf),
- "%s protocol %d port %d unreachable",
+ "%s protocol %u port %u unreachable",
ipaddr_string(ndo, &oip->ip_dst),
- oip->ip_p, dport);
+ ip_proto, dport);
break;
}
break;
case ICMP_UNREACH_NEEDFRAG:
{
- register const struct mtu_discovery *mp;
+ const struct mtu_discovery *mp;
mp = (const struct mtu_discovery *)(const u_char *)&dp->icmp_void;
- mtu = EXTRACT_16BITS(&mp->nexthopmtu);
+ mtu = EXTRACT_BE_U_2(mp->nexthopmtu);
if (mtu) {
(void)snprintf(buf, sizeof(buf),
"%s unreachable - need to frag (mtu %d)",
default:
fmt = tok2str(unreach2str, "#%d %%s unreachable",
- dp->icmp_code);
+ icmp_code);
(void)snprintf(buf, sizeof(buf), fmt,
ipaddr_string(ndo, &dp->icmp_ip.ip_dst));
break;
case ICMP_REDIRECT:
ND_TCHECK(dp->icmp_ip.ip_dst);
fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
- dp->icmp_code);
+ icmp_code);
(void)snprintf(buf, sizeof(buf), fmt,
ipaddr_string(ndo, &dp->icmp_ip.ip_dst),
ipaddr_string(ndo, &dp->icmp_gwaddr));
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");
ND_TCHECK(*ihp);
(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
cp = buf + strlen(buf);
- lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
+ lifetime = EXTRACT_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;
+ num = EXTRACT_U_1(ihp->ird_addrnum);
(void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
cp = buf + strlen(buf);
- size = ihp->ird_addrsiz;
+ size = EXTRACT_U_1(ihp->ird_addrsiz);
if (size != 2) {
(void)snprintf(cp, sizeof(buf) - (cp - buf),
" [size %d]", size);
break;
}
- idp = (struct id_rdiscovery *)&dp->icmp_data;
+ idp = (const struct id_rdiscovery *)&dp->icmp_data;
while (num-- > 0) {
ND_TCHECK(*idp);
(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
ipaddr_string(ndo, &idp->ird_addr),
- EXTRACT_32BITS(&idp->ird_pref));
+ EXTRACT_BE_U_4(idp->ird_pref));
cp = buf + strlen(buf);
++idp;
}
case ICMP_TIMXCEED:
ND_TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
+ 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 {
ND_TCHECK(dp->icmp_pptr);
(void)snprintf(buf, sizeof(buf),
- "parameter problem - octet %d", dp->icmp_pptr);
+ "parameter problem - octet %u", EXTRACT_U_1(dp->icmp_pptr));
}
break;
case ICMP_MASKREPLY:
ND_TCHECK(dp->icmp_mask);
(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
- EXTRACT_32BITS(&dp->icmp_mask));
+ EXTRACT_BE_U_4(dp->icmp_mask));
break;
case ICMP_TSTAMP:
ND_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));
+ EXTRACT_BE_U_2(dp->icmp_id),
+ EXTRACT_BE_U_2(dp->icmp_seq));
break;
case ICMP_TSTAMPREPLY:
ND_TCHECK(dp->icmp_ttime);
(void)snprintf(buf, sizeof(buf),
"time stamp reply id %u seq %u: org %s",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq),
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_otime)));
+ EXTRACT_BE_U_2(dp->icmp_id),
+ EXTRACT_BE_U_2(dp->icmp_seq),
+ icmp_tstamp_print(EXTRACT_BE_U_4(dp->icmp_otime)));
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_rtime)));
+ icmp_tstamp_print(EXTRACT_BE_U_4(dp->icmp_rtime)));
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_ttime)));
+ icmp_tstamp_print(EXTRACT_BE_U_4(dp->icmp_ttime)));
break;
default:
- str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
+ str = tok2str(icmp2str, "type-#%d", icmp_type);
break;
}
ND_PRINT((ndo, "ICMP %s, length %u", str, plen));
if (ndo->ndo_vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
- uint16_t sum, icmp_sum;
-
- if (ND_TTEST2(*bp, plen)) {
+ 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);
+ uint16_t icmp_sum = EXTRACT_BE_U_2(dp->icmp_cksum);
ND_PRINT((ndo, " (wrong icmp cksum %x (->%x)!)",
icmp_sum,
in_cksum_shouldbe(icmp_sum, sum)));
* 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(dp->icmp_type)) {
+ if (ndo->ndo_vflag >= 1 && ICMP_ERRTYPE(icmp_type)) {
bp += 8;
ND_PRINT((ndo, "\n\t"));
ip = (const struct ip *)bp;
- ndo->ndo_snaplen = ndo->ndo_snapend - bp;
snapend_save = ndo->ndo_snapend;
- ip_print(ndo, bp, EXTRACT_16BITS(&ip->ip_len));
+ ND_TCHECK_2(ip->ip_len);
+ ip_print(ndo, bp, EXTRACT_BE_U_2(ip->ip_len));
ndo->ndo_snapend = snapend_save;
}
/*
* Attempt to decode the MPLS extensions only for some ICMP types.
*/
- if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(dp->icmp_type)) {
+ if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(icmp_type)) {
ND_TCHECK(*ext_dp);
* to check if an extension header is present. This is expedient,
* however not all implementations set the length field proper.
*/
- if (!ext_dp->icmp_length) {
- vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res;
+ if (EXTRACT_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;
}
hlen = plen - ICMP_EXTD_MINLEN;
- vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res;
- vec[0].len = hlen;
- ND_PRINT((ndo, ", checksum 0x%04x (%scorrect), length %u",
- EXTRACT_16BITS(ext_dp->icmp_ext_checksum),
- in_cksum(vec, 1) ? "in" : "",
- hlen));
+ 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((ndo, ", checksum 0x%04x (%scorrect), length %u",
+ EXTRACT_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;
icmp_mpls_ext_object_header = (const struct icmp_mpls_ext_object_header_t *)obj_tptr;
ND_TCHECK(*icmp_mpls_ext_object_header);
- obj_tlen = EXTRACT_16BITS(icmp_mpls_ext_object_header->length);
- obj_class_num = icmp_mpls_ext_object_header->class_num;
- obj_ctype = icmp_mpls_ext_object_header->ctype;
+ obj_tlen = EXTRACT_BE_U_2(icmp_mpls_ext_object_header->length);
+ obj_class_num = EXTRACT_U_1(icmp_mpls_ext_object_header->class_num);
+ obj_ctype = EXTRACT_U_1(icmp_mpls_ext_object_header->ctype);
obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t);
ND_PRINT((ndo, "\n\t %s Object (%u), Class-Type: %u, length %u",
case 1:
switch(obj_ctype) {
case 1:
- ND_TCHECK2(*obj_tptr, 4);
- raw_label = EXTRACT_32BITS(obj_tptr);
+ ND_TCHECK_4(obj_tptr);
+ raw_label = EXTRACT_BE_U_4(obj_tptr);
ND_PRINT((ndo, "\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label)));
if (MPLS_STACK(raw_label))
ND_PRINT((ndo, ", [S]"));
projects / tcpdump / blobdiff