*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.101 2001-10-27 07:42:46 guy Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.159 2007-09-14 01:29:28 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
+#include <tcpdump-stdinc.h>
-#include <netinet/in.h>
-
-#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
#include "addrtoname.h"
#include "interface.h"
#include "extract.h" /* must come after interface.h */
#include "ip.h"
-
-/* Compatibility */
-#ifndef IPPROTO_ND
-#define IPPROTO_ND 77
-#endif
+#include "ipproto.h"
+
+struct tok ip_option_values[] = {
+ { IPOPT_EOL, "EOL" },
+ { IPOPT_NOP, "NOP" },
+ { IPOPT_TS, "timestamp" },
+ { IPOPT_SECURITY, "security" },
+ { IPOPT_RR, "RR" },
+ { IPOPT_SSRR, "SSRR" },
+ { IPOPT_LSRR, "LSRR" },
+ { IPOPT_RA, "RA" },
+ { IPOPT_RFC1393, "traceroute" },
+ { 0, NULL }
+};
/*
* print the recorded route in an IP RR, LSRR or SSRR option.
*/
static void
-ip_printroute(const char *type, register const u_char *cp, u_int length)
+ip_printroute(register const u_char *cp, u_int length)
{
- register u_int ptr = cp[2] - 1;
+ register u_int ptr;
register u_int len;
- printf(" %s{", type);
+ if (length < 3) {
+ printf(" [bad length %u]", length);
+ return;
+ }
if ((length + 1) & 3)
- printf(" [bad length %d]", length);
+ printf(" [bad length %u]", length);
+ ptr = cp[2] - 1;
if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
- printf(" [bad ptr %d]", cp[2]);
+ printf(" [bad ptr %u]", cp[2]);
- type = "";
for (len = 3; len < length; len += 4) {
- if (ptr == len)
- type = "#";
- printf("%s%s", type, ipaddr_string(&cp[len]));
- type = " ";
+ printf(" %s", ipaddr_string(&cp[len]));
+ if (ptr > len)
+ printf(",");
}
- printf("%s}", ptr == len? "#" : "");
+}
+
+/*
+ * If source-routing is present and valid, return the final destination.
+ * Otherwise, return IP destination.
+ *
+ * This is used for UDP and TCP pseudo-header in the checksum
+ * calculation.
+ */
+u_int32_t
+ip_finddst(const struct ip *ip)
+{
+ int length;
+ int len;
+ const u_char *cp;
+ u_int32_t retval;
+
+ cp = (const u_char *)(ip + 1);
+ length = (IP_HL(ip) << 2) - sizeof(struct ip);
+
+ for (; length > 0; cp += len, length -= len) {
+ int tt;
+
+ TCHECK(*cp);
+ tt = *cp;
+ if (tt == IPOPT_EOL)
+ break;
+ else if (tt == IPOPT_NOP)
+ len = 1;
+ else {
+ TCHECK(cp[1]);
+ len = cp[1];
+ if (len < 2)
+ break;
+ }
+ TCHECK2(*cp, len);
+ switch (tt) {
+
+ case IPOPT_SSRR:
+ case IPOPT_LSRR:
+ if (len < 7)
+ break;
+ memcpy(&retval, cp + len - 4, 4);
+ return retval;
+ }
+ }
+trunc:
+ memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+ return retval;
}
static void
ip_printts(register const u_char *cp, u_int length)
{
- register u_int ptr = cp[2] - 1;
- register u_int len = 0;
+ register u_int ptr;
+ register u_int len;
int hoplen;
- char *type;
+ const char *type;
+ if (length < 4) {
+ printf("[bad length %u]", length);
+ return;
+ }
printf(" TS{");
hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
if ((length - 4) & (hoplen-1))
- printf("[bad length %d]", length);
+ printf("[bad length %u]", length);
+ ptr = cp[2] - 1;
+ len = 0;
if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
- printf("[bad ptr %d]", cp[2]);
+ printf("[bad ptr %u]", cp[2]);
switch (cp[3]&0xF) {
case IPOPT_TS_TSONLY:
printf("TSONLY");
case 3: /* IPOPT_TS_PRESPEC */
printf("PRESPEC");
break;
- default:
+ default:
printf("[bad ts type %d]", cp[3]&0xF);
goto done;
}
static void
ip_optprint(register const u_char *cp, u_int length)
{
- register u_int len;
+ register u_int option_len;
+ const char *sep = "";
- for (; length > 0; cp += len, length -= len) {
- int tt = *cp;
+ for (; length > 0; cp += option_len, length -= option_len) {
+ u_int option_code;
+
+ printf("%s", sep);
+ sep = ",";
+
+ TCHECK(*cp);
+ option_code = *cp;
+
+ printf("%s",
+ tok2str(ip_option_values,"unknown %u",option_code));
+
+ if (option_code == IPOPT_NOP ||
+ option_code == IPOPT_EOL)
+ option_len = 1;
- if (tt == IPOPT_NOP || tt == IPOPT_EOL)
- len = 1;
else {
- if (&cp[1] >= snapend) {
- printf("[|ip]");
+ TCHECK(cp[1]);
+ option_len = cp[1];
+ if (option_len < 2) {
+ printf(" [bad length %u]", option_len);
return;
}
- len = cp[1];
- }
- if (len <= 0) {
- printf("[|ip op len %d]", len);
- return;
}
- if (&cp[1] >= snapend || cp + len > snapend) {
- printf("[|ip]");
+
+ if (option_len > length) {
+ printf(" [bad length %u]", option_len);
return;
}
- switch (tt) {
+ TCHECK2(*cp, option_len);
+
+ switch (option_code) {
case IPOPT_EOL:
- printf(" EOL");
- if (length > 1)
- printf("-%d", length - 1);
return;
- case IPOPT_NOP:
- printf(" NOP");
- break;
-
case IPOPT_TS:
- ip_printts(cp, len);
- break;
-
-#ifndef IPOPT_SECURITY
-#define IPOPT_SECURITY 130
-#endif /* IPOPT_SECURITY */
- case IPOPT_SECURITY:
- printf(" SECURITY{%d}", len);
- break;
-
- case IPOPT_RR:
- ip_printroute("RR", cp, len);
+ ip_printts(cp, option_len);
break;
+ case IPOPT_RR: /* fall through */
case IPOPT_SSRR:
- ip_printroute("SSRR", cp, len);
- break;
-
case IPOPT_LSRR:
- ip_printroute("LSRR", cp, len);
+ ip_printroute(cp, option_len);
break;
-#ifndef IPOPT_RA
-#define IPOPT_RA 148 /* router alert */
-#endif
case IPOPT_RA:
- printf(" RA");
- if (len != 4)
- printf("{%d}", len);
- else if (cp[2] || cp[3])
- printf("%d.%d", cp[2], cp[3]);
+ if (option_len < 4) {
+ printf(" [bad length %u]", option_len);
+ break;
+ }
+ TCHECK(cp[3]);
+ if (EXTRACT_16BITS(&cp[2]) != 0)
+ printf(" value %u", EXTRACT_16BITS(&cp[2]));
break;
+ case IPOPT_NOP: /* nothing to print - fall through */
+ case IPOPT_SECURITY:
default:
- printf(" IPOPT-%d{%d}", cp[0], len);
break;
}
}
+ return;
+
+trunc:
+ printf("[|ip]");
}
/*
u_short answer;
int sum = csum;
- /*
+ /*
* Our algorithm is simple, using a 32 bit accumulator (sum),
* we add sequential 16 bit words to it, and at the end, fold
* back all the carry bits from the top 16 bits into the lower
* 16 bits.
- */
+ */
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/*
- * print an IP datagram.
+ * Given the host-byte-order value of the checksum field in a packet
+ * header, and the network-byte-order computed checksum of the data
+ * that the checksum covers (including the checksum itself), compute
+ * what the checksum field *should* have been.
*/
-void
-ip_print(register const u_char *bp, register u_int length)
+u_int16_t
+in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum)
{
- register const struct ip *ip;
- register u_int hlen, len, len0, off;
- register const u_char *cp;
- u_char nh;
- int advance;
- struct protoent *proto;
+ u_int32_t shouldbe;
- ip = (const struct ip *)bp;
-#ifdef LBL_ALIGN
/*
- * If the IP header is not aligned, copy into abuf.
- * This will never happen with BPF. It does happen raw packet
- * dumps from -r.
+ * The value that should have gone into the checksum field
+ * is the negative of the value gotten by summing up everything
+ * *but* the checksum field.
+ *
+ * We can compute that by subtracting the value of the checksum
+ * field from the sum of all the data in the packet, and then
+ * computing the negative of that value.
+ *
+ * "sum" is the value of the checksum field, and "computed_sum"
+ * is the negative of the sum of all the data in the packets,
+ * so that's -(-computed_sum - sum), or (sum + computed_sum).
+ *
+ * All the arithmetic in question is one's complement, so the
+ * addition must include an end-around carry; we do this by
+ * doing the arithmetic in 32 bits (with no sign-extension),
+ * and then adding the upper 16 bits of the sum, which contain
+ * the carry, to the lower 16 bits of the sum, and then do it
+ * again in case *that* sum produced a carry.
+ *
+ * As RFC 1071 notes, the checksum can be computed without
+ * byte-swapping the 16-bit words; summing 16-bit words
+ * on a big-endian machine gives a big-endian checksum, which
+ * can be directly stuffed into the big-endian checksum fields
+ * in protocol headers, and summing words on a little-endian
+ * machine gives a little-endian checksum, which must be
+ * byte-swapped before being stuffed into a big-endian checksum
+ * field.
+ *
+ * "computed_sum" is a network-byte-order value, so we must put
+ * it in host byte order before subtracting it from the
+ * host-byte-order value from the header; the adjusted checksum
+ * will be in host byte order, which is what we'll return.
*/
- if ((long)ip & 3) {
- static u_char *abuf = NULL;
- static int didwarn = 0;
-
- if (abuf == NULL) {
- abuf = (u_char *)malloc(snaplen);
- if (abuf == NULL)
- error("ip_print: malloc");
- }
- memcpy((char *)abuf, (char *)ip, min(length, snaplen));
- snapend += abuf - (u_char *)ip;
- packetp = abuf;
- ip = (struct ip *)abuf;
- /* We really want libpcap to give us aligned packets */
- if (!didwarn) {
- warning("compensating for unaligned libpcap packets");
- ++didwarn;
- }
- }
-#endif
- if ((u_char *)(ip + 1) > snapend) {
- printf("[|ip]");
- return;
- }
- if (length < sizeof (struct ip)) {
- (void)printf("truncated-ip %d", length);
- return;
- }
- hlen = IP_HL(ip) * 4;
- if (hlen < sizeof (struct ip)) {
- (void)printf("bad-hlen %d", hlen);
- return;
- }
+ shouldbe = sum;
+ shouldbe += ntohs(computed_sum);
+ shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
+ shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
+ return shouldbe;
+}
- len = ntohs(ip->ip_len);
- if (length < len)
- (void)printf("truncated-ip - %d bytes missing! ",
- len - length);
- len -= hlen;
- len0 = len;
+#define IP_RES 0x8000
- /*
- * If this is fragment zero, hand it to the next higher
- * level protocol.
- */
- off = ntohs(ip->ip_off);
- if ((off & 0x1fff) == 0) {
- cp = (const u_char *)ip + hlen;
- nh = ip->ip_p;
+static struct tok ip_frag_values[] = {
+ { IP_MF, "+" },
+ { IP_DF, "DF" },
+ { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
+ { 0, NULL }
+};
-#ifndef IPPROTO_SCTP
-#define IPPROTO_SCTP 132
-#endif
- if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
- nh != IPPROTO_SCTP) {
- (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
- }
-again:
- switch (nh) {
+struct ip_print_demux_state {
+ const struct ip *ip;
+ const u_char *cp;
+ u_int len, off;
+ u_char nh;
+ int advance;
+};
-#ifndef IPPROTO_AH
-#define IPPROTO_AH 51
-#endif
- case IPPROTO_AH:
- nh = *cp;
- advance = ah_print(cp, (const u_char *)ip);
- cp += advance;
- len -= advance;
- goto again;
-
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP 50
-#endif
- case IPPROTO_ESP:
- {
- int enh, padlen;
- advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
- cp += advance;
- len -= advance + padlen;
- if (enh < 0)
- break;
- nh = enh & 0xff;
- goto again;
- }
-
-#ifndef IPPROTO_IPCOMP
-#define IPPROTO_IPCOMP 108
-#endif
- case IPPROTO_IPCOMP:
- {
- int enh;
- advance = ipcomp_print(cp, (const u_char *)ip, &enh);
- cp += advance;
- len -= advance;
- if (enh < 0)
- break;
- nh = enh & 0xff;
- goto again;
- }
+static void
+ip_print_demux(netdissect_options *ndo,
+ struct ip_print_demux_state *ipds)
+{
+ struct protoent *proto;
- case IPPROTO_SCTP:
- sctp_print(cp, (const u_char *)ip, len);
- break;
+again:
+ switch (ipds->nh) {
- case IPPROTO_TCP:
- tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
+ case IPPROTO_AH:
+ ipds->nh = *ipds->cp;
+ ipds->advance = ah_print(ipds->cp);
+ if (ipds->advance <= 0)
break;
-
- case IPPROTO_UDP:
- udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
+ ipds->cp += ipds->advance;
+ ipds->len -= ipds->advance;
+ goto again;
+
+ case IPPROTO_ESP:
+ {
+ int enh, padlen;
+ ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
+ (const u_char *)ipds->ip,
+ &enh, &padlen);
+ if (ipds->advance <= 0)
break;
-
- case IPPROTO_ICMP:
- icmp_print(cp, len, (const u_char *)ip);
- break;
-
-#ifndef IPPROTO_IGRP
-#define IPPROTO_IGRP 9
-#endif
- case IPPROTO_IGRP:
- igrp_print(cp, len, (const u_char *)ip);
+ ipds->cp += ipds->advance;
+ ipds->len -= ipds->advance + padlen;
+ ipds->nh = enh & 0xff;
+ goto again;
+ }
+
+ case IPPROTO_IPCOMP:
+ {
+ int enh;
+ ipds->advance = ipcomp_print(ipds->cp, &enh);
+ if (ipds->advance <= 0)
break;
+ ipds->cp += ipds->advance;
+ ipds->len -= ipds->advance;
+ ipds->nh = enh & 0xff;
+ goto again;
+ }
- case IPPROTO_ND:
- (void)printf(" nd %d", len);
- break;
+ case IPPROTO_SCTP:
+ sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
+ break;
- case IPPROTO_EGP:
- egp_print(cp, len, (const u_char *)ip);
- break;
+ case IPPROTO_DCCP:
+ dccp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
+ break;
+
+ case IPPROTO_TCP:
+ /* pass on the MF bit plus the offset to detect fragments */
+ tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
+ ipds->off & (IP_MF|IP_OFFMASK));
+ break;
+
+ case IPPROTO_UDP:
+ /* pass on the MF bit plus the offset to detect fragments */
+ udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
+ ipds->off & (IP_MF|IP_OFFMASK));
+ break;
+
+ case IPPROTO_ICMP:
+ /* pass on the MF bit plus the offset to detect fragments */
+ icmp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
+ ipds->off & (IP_MF|IP_OFFMASK));
+ break;
+
+ case IPPROTO_PIGP:
+ /*
+ * XXX - the current IANA protocol number assignments
+ * page lists 9 as "any private interior gateway
+ * (used by Cisco for their IGRP)" and 88 as
+ * "EIGRP" from Cisco.
+ *
+ * Recent BSD <netinet/in.h> headers define
+ * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
+ * We define IP_PROTO_PIGP as 9 and
+ * IP_PROTO_EIGRP as 88; those names better
+ * match was the current protocol number
+ * assignments say.
+ */
+ igrp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
+ break;
+
+ case IPPROTO_EIGRP:
+ eigrp_print(ipds->cp, ipds->len);
+ break;
+
+ case IPPROTO_ND:
+ ND_PRINT((ndo, " nd %d", ipds->len));
+ break;
-#ifndef IPPROTO_OSPF
-#define IPPROTO_OSPF 89
-#endif
- case IPPROTO_OSPF:
- ospf_print(cp, len, (const u_char *)ip);
- break;
+ case IPPROTO_EGP:
+ egp_print(ipds->cp, ipds->len);
+ break;
-#ifndef IPPROTO_IGMP
-#define IPPROTO_IGMP 2
-#endif
- case IPPROTO_IGMP:
- igmp_print(cp, len);
- break;
+ case IPPROTO_OSPF:
+ ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
+ break;
- case 4:
- /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
- ip_print(cp, len);
- if (! vflag) {
- printf(" (ipip-proto-4)");
- return;
- }
- break;
+ case IPPROTO_IGMP:
+ igmp_print(ipds->cp, ipds->len);
+ break;
+ case IPPROTO_IPV4:
+ /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
+ ip_print(gndo, ipds->cp, ipds->len);
+ if (! vflag) {
+ ND_PRINT((ndo, " (ipip-proto-4)"));
+ return;
+ }
+ break;
+
#ifdef INET6
-#ifndef IP6PROTO_ENCAP
-#define IP6PROTO_ENCAP 41
-#endif
- case IP6PROTO_ENCAP:
- /* ip6-in-ip encapsulation */
- ip6_print(cp, len);
- break;
+ case IPPROTO_IPV6:
+ /* ip6-in-ip encapsulation */
+ ip6_print(ipds->cp, ipds->len);
+ break;
#endif /*INET6*/
+ case IPPROTO_RSVP:
+ rsvp_print(ipds->cp, ipds->len);
+ break;
-#ifndef IPPROTO_GRE
-#define IPPROTO_GRE 47
-#endif
- case IPPROTO_GRE:
- /* do it */
- gre_print(cp, len);
- break;
+ case IPPROTO_GRE:
+ /* do it */
+ gre_print(ipds->cp, ipds->len);
+ break;
-#ifndef IPPROTO_MOBILE
-#define IPPROTO_MOBILE 55
-#endif
- case IPPROTO_MOBILE:
- mobile_print(cp, len);
- break;
+ case IPPROTO_MOBILE:
+ mobile_print(ipds->cp, ipds->len);
+ break;
-#ifndef IPPROTO_PIM
-#define IPPROTO_PIM 103
-#endif
- case IPPROTO_PIM:
- pim_print(cp, len);
- break;
+ case IPPROTO_PIM:
+ pim_print(ipds->cp, ipds->len,
+ in_cksum((const u_short*)ipds->cp, ipds->len, 0));
+ break;
-#ifndef IPPROTO_VRRP
-#define IPPROTO_VRRP 112
-#endif
- case IPPROTO_VRRP:
- vrrp_print(cp, len, ip->ip_ttl);
- break;
+ case IPPROTO_VRRP:
+ vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
+ break;
- default:
- if ((proto = getprotobynumber(nh)) != NULL)
- (void)printf(" %s", proto->p_name);
- else
- (void)printf(" ip-proto-%d", nh);
- printf(" %d", len);
- break;
- }
+ case IPPROTO_PGM:
+ pgm_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
+ break;
+
+ default:
+ if ((proto = getprotobynumber(ipds->nh)) != NULL)
+ ND_PRINT((ndo, " %s", proto->p_name));
+ else
+ ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
+ ND_PRINT((ndo, " %d", ipds->len));
+ break;
}
+}
+
+void
+ip_print_inner(netdissect_options *ndo,
+ const u_char *bp,
+ u_int length, u_int nh,
+ const u_char *bp2)
+{
+ struct ip_print_demux_state ipd;
- /* Ultra quiet now means that all this stuff should be suppressed */
- /* res 3-Nov-98 */
- if (qflag > 1) return;
+ ipd.ip = (const struct ip *)bp2;
+ ipd.cp = bp;
+ ipd.len = length;
+ ipd.off = 0;
+ ipd.nh = nh;
+ ipd.advance = 0;
+ ip_print_demux(ndo, &ipd);
+}
- /*
- * for fragmented datagrams, print id:size@offset. On all
- * but the last stick a "+". For unfragmented datagrams, note
- * the don't fragment flag.
- */
- len = len0; /* get the original length */
- if (off & 0x3fff) {
- /*
- * if this isn't the first frag, we're missing the
- * next level protocol header. print the ip addr
- * and the protocol.
- */
- if (off & 0x1fff) {
- (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
- if ((proto = getprotobynumber(ip->ip_p)) != NULL)
- (void)printf(" %s", proto->p_name);
- else
- (void)printf(" ip-proto-%d", ip->ip_p);
- }
-#ifndef IP_MF
-#define IP_MF 0x2000
-#endif /* IP_MF */
-#ifndef IP_DF
-#define IP_DF 0x4000
-#endif /* IP_DF */
- (void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len,
- (off & 0x1fff) * 8,
- (off & IP_MF)? "+" : "");
-
- } else if (off & IP_DF)
- (void)printf(" (DF)");
-
- if (ip->ip_tos) {
- (void)printf(" [tos 0x%x", (int)ip->ip_tos);
- /* ECN bits */
- if (ip->ip_tos & 0x03) {
- switch (ip->ip_tos & 0x03) {
- case 1:
- (void)printf(",ECT(1)");
- break;
- case 2:
- (void)printf(",ECT(0)");
- break;
- case 3:
- (void)printf(",CE");
- }
- }
- (void)printf("] ");
+
+/*
+ * print an IP datagram.
+ */
+void
+ip_print(netdissect_options *ndo,
+ const u_char *bp,
+ u_int length)
+{
+ struct ip_print_demux_state ipd;
+ struct ip_print_demux_state *ipds=&ipd;
+ const u_char *ipend;
+ u_int hlen;
+ u_int16_t sum, ip_sum;
+ struct protoent *proto;
+
+ ipds->ip = (const struct ip *)bp;
+ if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
+ printf("IP%u ", IP_V(ipds->ip));
+ if (IP_V(ipds->ip) == 6)
+ printf(", wrong link-layer encapsulation");
}
+ else if (!eflag)
+ printf("IP ");
- if (ip->ip_ttl <= 1)
- (void)printf(" [ttl %d]", (int)ip->ip_ttl);
+ if ((u_char *)(ipds->ip + 1) > snapend) {
+ printf("[|ip]");
+ return;
+ }
+ if (length < sizeof (struct ip)) {
+ (void)printf("truncated-ip %u", length);
+ return;
+ }
+ hlen = IP_HL(ipds->ip) * 4;
+ if (hlen < sizeof (struct ip)) {
+ (void)printf("bad-hlen %u", hlen);
+ return;
+ }
- if (vflag) {
- int sum;
- char *sep = "";
+ ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
+ if (length < ipds->len)
+ (void)printf("truncated-ip - %u bytes missing! ",
+ ipds->len - length);
+ if (ipds->len < hlen) {
+#ifdef GUESS_TSO
+ if (ipds->len) {
+ (void)printf("bad-len %u", ipds->len);
+ return;
+ }
+ else {
+ /* we guess that it is a TSO send */
+ ipds->len = length;
+ }
+#else
+ (void)printf("bad-len %u", ipds->len);
+ return;
+#endif /* GUESS_TSO */
+ }
- printf(" (");
- if (ip->ip_ttl > 1) {
- (void)printf("%sttl %d", sep, (int)ip->ip_ttl);
- sep = ", ";
- }
- if ((off & 0x3fff) == 0) {
- (void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
- sep = ", ";
- }
- (void)printf("%slen %d", sep, (int)ntohs(ip->ip_len));
- sep = ", ";
- if ((u_char *)ip + hlen <= snapend) {
- sum = in_cksum((const u_short *)ip, hlen, 0);
- if (sum != 0) {
- (void)printf("%sbad cksum %x!", sep,
- ntohs(ip->ip_sum));
- sep = ", ";
- }
+ /*
+ * Cut off the snapshot length to the end of the IP payload.
+ */
+ ipend = bp + ipds->len;
+ if (ipend < snapend)
+ snapend = ipend;
+
+ ipds->len -= hlen;
+
+ ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
+
+ if (vflag) {
+ (void)printf("(tos 0x%x", (int)ipds->ip->ip_tos);
+ /* ECN bits */
+ if (ipds->ip->ip_tos & 0x03) {
+ switch (ipds->ip->ip_tos & 0x03) {
+ case 1:
+ (void)printf(",ECT(1)");
+ break;
+ case 2:
+ (void)printf(",ECT(0)");
+ break;
+ case 3:
+ (void)printf(",CE");
+ }
+ }
+
+ if (ipds->ip->ip_ttl >= 1)
+ (void)printf(", ttl %u", ipds->ip->ip_ttl);
+
+ /*
+ * for the firewall guys, print id, offset.
+ * On all but the last stick a "+" in the flags portion.
+ * For unfragmented datagrams, note the don't fragment flag.
+ */
+
+ (void)printf(", id %u, offset %u, flags [%s], proto %s (%u)",
+ EXTRACT_16BITS(&ipds->ip->ip_id),
+ (ipds->off & 0x1fff) * 8,
+ bittok2str(ip_frag_values, "none", ipds->off&0xe000),
+ tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
+ ipds->ip->ip_p);
+
+ (void)printf(", length %u", EXTRACT_16BITS(&ipds->ip->ip_len));
+
+ if ((hlen - sizeof(struct ip)) > 0) {
+ printf(", options (");
+ ip_optprint((u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
+ printf(")");
+ }
+
+ if (!Kflag && (u_char *)ipds->ip + hlen <= snapend) {
+ sum = in_cksum((const u_short *)ipds->ip, hlen, 0);
+ if (sum != 0) {
+ ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
+ (void)printf(", bad cksum %x (->%x)!", ip_sum,
+ in_cksum_shouldbe(ip_sum, sum));
}
- if ((hlen -= sizeof(struct ip)) > 0) {
- (void)printf("%soptlen=%d", sep, hlen);
- ip_optprint((u_char *)(ip + 1), hlen);
+ }
+
+ printf(")\n ");
+ }
+
+ /*
+ * If this is fragment zero, hand it to the next higher
+ * level protocol.
+ */
+ if ((ipds->off & 0x1fff) == 0) {
+ ipds->cp = (const u_char *)ipds->ip + hlen;
+ ipds->nh = ipds->ip->ip_p;
+
+ if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
+ ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
+ (void)printf("%s > %s: ",
+ ipaddr_string(&ipds->ip->ip_src),
+ ipaddr_string(&ipds->ip->ip_dst));
}
- printf(")");
+ ip_print_demux(ndo, ipds);
+ } else {
+ /* Ultra quiet now means that all this stuff should be suppressed */
+ if (qflag > 1) return;
+
+ /*
+ * if this isn't the first frag, we're missing the
+ * next level protocol header. print the ip addr
+ * and the protocol.
+ */
+ if (ipds->off & 0x1fff) {
+ (void)printf("%s > %s:", ipaddr_string(&ipds->ip->ip_src),
+ ipaddr_string(&ipds->ip->ip_dst));
+ if ((proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
+ (void)printf(" %s", proto->p_name);
+ else
+ (void)printf(" ip-proto-%d", ipds->ip->ip_p);
+ }
}
}
memcpy (&hdr, (char *)ip, 4);
switch (IP_V(&hdr)) {
case 4:
- ip_print (bp, length);
+ ip_print (gndo, bp, length);
return;
#ifdef INET6
case 6:
return;
}
}
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
+
+
projects / tcpdump / blobdiff