Bounds-check the individual components of a SAP reply.

[tcpdump] / print-ip.c

diff --git a/print-ip.c b/print-ip.c
index 2951875ee970c90f6b778887172671c48f3abc86..fc58f65529cb21e0a554542e9de4b800ab85f19d 100644 (file)
--- a/print-ip.c
+++ b/print-ip.c
@@ -1,7 +1,5 @@
-/*     $NetBSD: print-ip.c,v 1.4 1995/04/24 13:27:43 cgd Exp $ */
-

 /*
 /*

- * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997

  *     The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  *     The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without


@@ -22,362 +20,704 @@
  */
 
 #ifndef lint
  */
 
 #ifndef lint

-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.68 1999-10-17 21:56:54 mcr Exp $ (LBL)";
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.149 2005-04-07 00:28:17 mcr Exp $ (LBL)";

 #endif
 
 #endif
 

-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif

 
 

-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <netinet/tcp.h>
+#include <tcpdump-stdinc.h>

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

-#ifdef __STDC__

 #include <stdlib.h>
 #include <stdlib.h>

-#endif
-#include <unistd.h>
+#include <string.h>

 
 

-#include "interface.h"

 #include "addrtoname.h"
 #include "addrtoname.h"

+#include "interface.h"
+#include "extract.h"                   /* must come after interface.h */
+
+#include "ip.h"
+#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" },
+    { 0, NULL }
+};

 
 

+/*
+ * print the recorded route in an IP RR, LSRR or SSRR option.
+ */

 static void
 static void

-igmp_print(register const u_char *bp, register int len,
-          register const u_char *bp2)
+ip_printroute(register const u_char *cp, u_int length)

 {
 {

-       register const struct ip *ip;
-       register const u_char *ep;
-
-       ip = (const struct ip *)bp2;
-       ep = (const u_char *)snapend;
-        (void)printf("%s > %s: ",
-               ipaddr_string(&ip->ip_src),
-               ipaddr_string(&ip->ip_dst));
+       register u_int ptr;
+       register u_int len;

 
 

-       if (bp + 7 > ep) {
-               (void)printf("[|igmp]");
+       if (length < 3) {
+               printf(" [bad length %u]", length);

                return;
        }
                return;
        }

-       switch (bp[0] & 0xf) {
-       case 1:
-               (void)printf("igmp query");
-               if (*(int *)&bp[4])
-                       (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
-               if (len != 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       case 2:
-               (void)printf("igmp report %s", ipaddr_string(&bp[4]));
-               if (len != 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       case 3:
-               (void)printf("igmp dvmrp %s", ipaddr_string(&bp[4]));
-               if (len < 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       default:
-               (void)printf("igmp-%d", bp[0] & 0xf);
-               break;
+       if ((length + 1) & 3)
+               printf(" [bad length %u]", length);
+       ptr = cp[2] - 1;
+       if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
+               printf(" [bad ptr %u]", cp[2]);
+
+       for (len = 3; len < length; len += 4) {
+               printf("%s", ipaddr_string(&cp[len]));
+                if (ptr > len)
+                    printf (", ");

        }
        }

-       if ((bp[0] >> 4) != 1)
-               (void)printf(" [v%d]", bp[0] >> 4);
-       if (bp[1])
-               (void)printf(" [b1=0x%x]", bp[1]);

 }
 
 /*
 }
 
 /*

- * print the recorded route in an IP RR, LSRR or SSRR option.
+ * 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.

  */
  */

-static void
-ip_printroute(const char *type, register const u_char *cp, int length)
+u_int32_t
+ip_finddst(const struct ip *ip)

 {
 {

-       int ptr = cp[2] - 1;
+       int length;

        int len;
        int len;

+       const u_char *cp;
+       u_int32_t retval;

 
 

-       printf(" %s{", type);
-       if ((length + 1) & 3)
-               printf(" [bad length %d]", length);
-       if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
-               printf(" [bad ptr %d]", cp[2]);
+       cp = (const u_char *)(ip + 1);
+       length = (IP_HL(ip) << 2) - sizeof(struct ip);

 
 

-       type = "";
-       for (len = 3; len < length; len += 4) {
-               if (ptr == len)
-                       type = "#";
-#ifdef TCPDUMP_ALIGN
-               {
-               struct in_addr addr;
-               bcopy((char *)&cp[len], (char *)&addr, sizeof(addr));
-               printf("%s%s", type, ipaddr_string(&addr));
+       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;

                }
                }

-#else
-               printf("%s%s", type, ipaddr_string(&cp[len]));
-#endif
+               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;
+       register u_int len;
+       int hoplen;
+       const char *type;
+
+       if (length < 4) {
+               printf("[bad length %d]", length);
+               return;
+       }
+       printf(" TS{");
+       hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
+       if ((length - 4) & (hoplen-1))
+               printf("[bad length %d]", length);
+       ptr = cp[2] - 1;
+       len = 0;
+       if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
+               printf("[bad ptr %d]", cp[2]);
+       switch (cp[3]&0xF) {
+       case IPOPT_TS_TSONLY:
+               printf("TSONLY");
+               break;
+       case IPOPT_TS_TSANDADDR:
+               printf("TS+ADDR");
+               break;
+       /*
+        * prespecified should really be 3, but some ones might send 2
+        * instead, and the IPOPT_TS_PRESPEC constant can apparently
+        * have both values, so we have to hard-code it here.
+        */
+
+       case 2:
+               printf("PRESPEC2.0");
+               break;
+       case 3:                 /* IPOPT_TS_PRESPEC */
+               printf("PRESPEC");
+               break;
+       default:
+               printf("[bad ts type %d]", cp[3]&0xF);
+               goto done;
+       }
+
+       type = " ";
+       for (len = 4; len < length; len += hoplen) {
+               if (ptr == len)
+                       type = " ^ ";
+               printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
+                      hoplen!=8 ? "" : ipaddr_string(&cp[len]));

                type = " ";
        }
                type = " ";
        }

-       printf("%s}", ptr == len? "#" : "");
+
+done:
+       printf("%s", ptr == len ? " ^ " : "");
+
+       if (cp[3]>>4)
+               printf(" [%d hops not recorded]} ", cp[3]>>4);
+       else
+               printf("}");

 }
 
 /*
  * print IP options.
  */
 static void
 }
 
 /*
  * print IP options.
  */
 static void

-ip_optprint(register const u_char *cp, int length)
+ip_optprint(register const u_char *cp, u_int length)

 {
 {

-       int len;
+       register u_int option_len;

 
 

-       for (; length > 0; cp += len, length -= len) {
-               int tt = *cp;
+       for (; length > 0; cp += option_len, length -= option_len) {
+               u_int option_code;

 
 

-               len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
-               if (&cp[1] >= snapend || cp + len > snapend) {
-                       printf("[|ip]");
-                       return;
+               TCHECK(*cp);
+               option_code = *cp;
+
+               if (option_code == IPOPT_NOP ||
+                    option_code == IPOPT_EOL)
+                       option_len = 1;
+
+               else {
+                       TCHECK(cp[1]);
+                       option_len = cp[1];                     

                }
                }

-               switch (tt) {

 
 

-               case IPOPT_EOL:
-                       printf(" EOL");
-                       if (length > 1)
-                               printf("-%d", length - 1);
-                       return;
+                printf("%s (%u) len %u",
+                       tok2str(ip_option_values,"unknown",option_code),
+                       option_code,
+                       option_len);

 
 

-               case IPOPT_NOP:
-                       printf(" NOP");
-                       break;
+                if (option_len < 2)
+                        return;

 
 

-               case IPOPT_TS:
-                       printf(" TS{%d}", len);
-                       break;
+                TCHECK2(*cp, option_len);

 
 

-               case IPOPT_SECURITY:
-                       printf(" SECURITY{%d}", len);
-                       break;
+               switch (option_code) {
+               case IPOPT_EOL:
+                       return;

 
 

-               case IPOPT_RR:
-                       printf(" RR{%d}=", len);
-                       ip_printroute("RR", cp, len);
+               case IPOPT_TS:
+                       ip_printts(cp, option_len);

                        break;
 
                        break;
 

+               case IPOPT_RR:       /* fall through */

                case IPOPT_SSRR:
                case IPOPT_SSRR:

-                       ip_printroute("SSRR", cp, len);
+               case IPOPT_LSRR:
+                       ip_printroute( cp, option_len);

                        break;
 
                        break;
 

-               case IPOPT_LSRR:
-                       ip_printroute("LSRR", cp, len);
+               case IPOPT_RA:
+                        TCHECK(cp[3]);
+                        if (EXTRACT_16BITS(&cp[2]) != 0)
+                            printf("value %u", EXTRACT_16BITS(&cp[2]));

                        break;
 
                        break;
 

+               case IPOPT_NOP:       /* nothing to print - fall through */
+               case IPOPT_SECURITY:

                default:
                default:

-                       printf(" IPOPT-%d{%d}", cp[0], len);

                        break;
                }
        }
                        break;
                }
        }

+       return;
+
+trunc:
+       printf("[|ip]");

 }
 
 /*
  * compute an IP header checksum.
  * don't modifiy the packet.
  */
 }
 
 /*
  * compute an IP header checksum.
  * don't modifiy the packet.
  */

-static int
-in_cksum(const struct ip *ip)
+u_short
+in_cksum(const u_short *addr, register u_int len, int csum)

 {
 {

-       register const u_short *sp = (u_short *)ip;
-       register u_int32 sum = 0;
-       register int count;
+       int nleft = len;
+       const u_short *w = addr;
+       u_short answer;
+       int sum = csum;

 
        /*
 
        /*

-        * No need for endian conversions.
+        *  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.

         */
         */

-       for (count = ip->ip_hl * 2; --count >= 0; )
-               sum += *sp++;
-       while (sum > 0xffff)
-               sum = (sum & 0xffff) + (sum >> 16);
-       sum = ~sum & 0xffff;
+       while (nleft > 1)  {
+               sum += *w++;
+               nleft -= 2;
+       }
+       if (nleft == 1)
+               sum += htons(*(u_char *)w<<8);

 
 

-       return (sum);
+       /*
+        * add back carry outs from top 16 bits to low 16 bits
+        */
+       sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
+       sum += (sum >> 16);                     /* add carry */
+       answer = ~sum;                          /* truncate to 16 bits */
+       return (answer);

 }
 
 }
 

+/*
+ * 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.
+ */
+u_int16_t
+in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum)
+{
+       u_int32_t shouldbe;
+
+       /*
+        * 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.
+        */
+       shouldbe = sum;
+       shouldbe += ntohs(computed_sum);
+       shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
+       shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
+       return shouldbe;
+}
+
+#ifndef IP_MF
+#define IP_MF 0x2000
+#endif /* IP_MF */
+#ifndef IP_DF
+#define IP_DF 0x4000
+#endif /* IP_DF */
+#define IP_RES 0x8000
+
+static struct tok ip_frag_values[] = {
+        { IP_MF,        "+" },
+        { IP_DF,        "DF" },
+       { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
+        { 0,            NULL }
+};
+
+struct ip_print_demux_state {
+       const struct ip *ip;
+       const u_char *cp;
+       u_int   len, off;
+       u_char  nh;
+       int     advance;
+};
+
+static void
+ip_print_demux(netdissect_options *ndo,
+              struct ip_print_demux_state *ipds)
+{
+       struct protoent *proto;

 
 

+again:
+       switch (ipds->nh) {
+
+       case IPPROTO_AH:
+               ipds->nh = *ipds->cp;
+               ipds->advance = ah_print(ipds->cp);
+               if (ipds->advance <= 0)
+                       break;
+               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;
+               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_SCTP:
+               sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
+               break;
+               
+       case IPPROTO_TCP:
+               tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
+                         (ipds->off &~ 0x6000));
+               break;
+               
+       case IPPROTO_UDP:
+               udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
+                         (ipds->off &~ 0x6000));
+               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 & 0x3fff));
+               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;
+
+       case IPPROTO_EGP:
+               egp_print(ipds->cp, ipds->len);
+               break;
+
+       case IPPROTO_OSPF:
+               ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
+               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
+       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;
+
+       case IPPROTO_GRE:
+               /* do it */
+               gre_print(ipds->cp, ipds->len);
+               break;
+
+       case IPPROTO_MOBILE:
+               mobile_print(ipds->cp, ipds->len);
+               break;
+
+       case IPPROTO_PIM:
+               pim_print(ipds->cp,  ipds->len);
+               break;
+
+       case IPPROTO_VRRP:
+               vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
+               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
 void

-print_ipproto(u_int proto, const struct ip *ip,
-             const u_char *cp,  int len)
+ip_print_inner(netdissect_options *ndo,
+              const u_char *bp,
+              u_int length, u_int nh,
+              const u_char *bp2)

 {
 {

-  switch (proto) {
-  case IPPROTO_TCP:
-    tcp_print(cp, len, (const u_char *)ip);
-    break;
-  case IPPROTO_UDP:
-    udp_print(cp, len, (const u_char *)ip);
-    break;
-  case IPPROTO_ICMP:
-    icmp_print(cp, (const u_char *)ip);
-    break;
-  case IPPROTO_ND:
-    (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                ipaddr_string(&ip->ip_dst));
-    (void)printf(" nd %d", len);
-    break;
-  case IPPROTO_EGP:
-    egp_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_OSPF
-#define IPPROTO_OSPF 89
-#endif
-  case IPPROTO_OSPF:
-    ospf_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_IGMP
-#define IPPROTO_IGMP 2
-#endif
-  case IPPROTO_IGMP:
-    igmp_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_ENCAP
-#define IPPROTO_ENCAP 4
-#endif
-  case IPPROTO_ENCAP:
-    /* ip-in-ip encapsulation */
-    if (vflag)
-      (void)printf("%s > %s: ",
-                  ipaddr_string(&ip->ip_src),
-                  ipaddr_string(&ip->ip_dst));
-    ip_print(cp, len);
-    if (! vflag) {
-      printf(" (encap)");
-      return;
-    }
-    break;
-
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP 50
-#endif
-  case IPPROTO_ESP:
-    esp_print(cp, len, (const u_char *)ip);
-    break;
+       struct ip_print_demux_state  ipd;

 
 

-#ifndef IPPROTO_AH
-#define IPPROTO_AH  51
-#endif
-  case IPPROTO_AH:
-    ah_print(cp, len, (const u_char *)ip);
-    break;
-    
-  default:
-    (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                ipaddr_string(&ip->ip_dst));
-    (void)printf(" ip-proto-%d %d", proto, len);
-    break;
-  }
+       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);

 }
 
 }
 

+

 /*
  * print an IP datagram.
  */
 void
 /*
  * print an IP datagram.
  */
 void

-ip_print(register const u_char *bp, register int length)
+ip_print(netdissect_options *ndo,
+        const u_char *bp,
+        u_int length)

 {
 {

-       register const struct ip *ip;
-       register int hlen;
-       register int len;
-       register int off;
-       register const u_char *cp;
-
-       ip = (const struct ip *)bp;
-#ifdef TCPDUMP_ALIGN
-       /*
-        * The IP header is not word aligned, so copy into abuf.
-        * This will never happen with BPF.  It does happen raw packet
-        * dumps from -r.
-        */
-       if ((long)ip & (sizeof(long)-1)) {
-               static u_char *abuf;
-
-               if (abuf == 0)
-                       abuf = (u_char *)malloc(snaplen);
-               bcopy((char *)ip, (char *)abuf, min(length, snaplen));
-               snapend += abuf - (u_char *)ip;
-               packetp = abuf;
-               ip = (struct ip *)abuf;
+       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");

        }
        }

-#endif
-       if ((u_char *)(ip + 1) > snapend) {
+        else if (!eflag)
+           printf("IP ");
+
+       if ((u_char *)(ipds->ip + 1) > snapend) {

                printf("[|ip]");
                return;
        }
        if (length < sizeof (struct ip)) {
                printf("[|ip]");
                return;
        }
        if (length < sizeof (struct ip)) {

-               (void)printf("truncated-ip %d", length);
+               (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;
        }
                return;
        }

-       hlen = ip->ip_hl * 4;

 
 

-       len = ntohs(ip->ip_len);
-       if (length < len)
-               (void)printf("truncated-ip - %d bytes missing!",
-                       len - length);
-       len -= hlen;
+       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 */
+       }

 
        /*
 
        /*

-        * If this is fragment zero, hand it to the next higher
-        * level protocol.
+        * Cut off the snapshot length to the end of the IP payload.

         */
         */

-       off = ntohs(ip->ip_off);
-       if ((off & 0x1fff) == 0) {
-               cp = (const u_char *)ip + hlen;
-               print_ipproto(ip->ip_p, ip, cp, len);
+       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 %3u", 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 ((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));
+               }
+           }
+
+            printf(") ");

        }
        }

+

        /*
        /*

-        * for fragmented datagrams, print id:size@offset.  On all
-        * but the last stick a "+".  For unfragmented datagrams, note
-        * the don't fragment flag.
+        * If this is fragment zero, hand it to the next higher
+        * level protocol.

         */
         */

-       if (off & 0x3fff) {
-               /*
-                * if this isn't the first frag, we're missing the
-                * next level protocol header.  print the ip addr.
-                */
-               if (off & 0x1fff)
-                       (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                                     ipaddr_string(&ip->ip_dst));
-               (void)printf(" (frag %d:%d@%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);
-       if (ip->ip_ttl <= 1)
-               (void)printf(" [ttl %d]", (int)ip->ip_ttl);
-
-       if (vflag) {
-               int sum;
-               char *sep = "";
-
-               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 = ", ";
+       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) {
+                       (void)printf("%s > %s: ",
+                                    ipaddr_string(&ipds->ip->ip_src),
+                                    ipaddr_string(&ipds->ip->ip_dst));

                }
                }

-               sum = in_cksum(ip);
-               if (sum != 0) {
-                       (void)printf("%sbad cksum %x!", sep,
-                                    ntohs(ip->ip_sum));
-                       sep = ", ";
-               }
-               if ((hlen -= sizeof(struct ip)) > 0) {
-                       (void)printf("%soptlen=%d", sep, hlen);
-                       ip_optprint((u_char *)(ip + 1), hlen);
-               }
-               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);
+           } 
+       }
+}
+
+void
+ipN_print(register const u_char *bp, register u_int length)
+{
+       struct ip *ip, hdr;
+
+       ip = (struct ip *)bp;
+       if (length < 4) {
+               (void)printf("truncated-ip %d", length);
+               return;
+       }
+       memcpy (&hdr, (char *)ip, 4);
+       switch (IP_V(&hdr)) {
+       case 4:
+               ip_print (gndo, bp, length);
+               return;
+#ifdef INET6
+       case 6:
+               ip6_print (bp, length);
+               return;
+#endif
+       default:
+               (void)printf("unknown ip %d", IP_V(&hdr));
+               return;

        }
 }
        }
 }

+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
+
+