There's no link-layer header on Linux ARPHRD_ATM packets; there's

[tcpdump] / print-cip.c

diff --git a/print-cip.c b/print-cip.c
index a6467136a253ca875e6f428986ca3fcb4806d365..28102325aab5357e0b95886e6fa37459fa4d1961 100644 (file)
--- a/print-cip.c
+++ b/print-cip.c
@@ -22,7 +22,7 @@
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.12 2001-03-19 03:58:10 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.16 2001-09-23 21:52:38 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -47,9 +47,6 @@ static const char rcsid[] =
 #include "ethertype.h"
 #include "ether.h"
 
-const u_char *packetp;
-const u_char *snapend;
-
 #define RFC1483LLC_LEN 8 
 
 static unsigned char rfcllc[] = {
@@ -63,25 +60,10 @@ static unsigned char rfcllc[] = {
 static inline void
 cip_print(register const u_char *bp, int length)
 {
-       int i;
-
-       if (memcmp(rfcllc, bp, sizeof(rfcllc))) {
-               if (qflag) {
-                       for (i = 0;i < RFC1483LLC_LEN; i++)
-                       (void)printf("%2.2x ",bp[i]);
-               } else {
-                       for (i = 0;i < RFC1483LLC_LEN - 2; i++)
-                               (void)printf("%2.2x ",bp[i]);
-                       etherproto_string(((u_short*)bp)[3]);
-               } 
-       } else {
-               if (qflag)
-                       (void)printf("(null encapsulation)");
-               else {
-                       (void)printf("(null encap)");
-                       etherproto_string(ETHERTYPE_IP);
-               }
-       }
+       /*
+        * There is no MAC-layer header, so just print the length.
+        */
+       printf("%d: ", length);
 }
 
 /*
@@ -93,12 +75,11 @@ cip_print(register const u_char *bp, int length)
 void
 cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 {
-       int caplen = h->caplen;
-       int length = h->len;
-       u_short ether_type;
+       u_int caplen = h->caplen;
+       u_int length = h->len;
        u_short extracted_ethertype;
-       u_short *bp;
 
+       ++infodelay;
        ts_print(&h->ts);
 
        if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
@@ -117,28 +98,15 @@ cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
        packetp = p;
        snapend = p + caplen;
 
-       if (memcmp(rfcllc, p, sizeof(rfcllc))==0) {
-               length -= RFC1483LLC_LEN;
-               caplen -= RFC1483LLC_LEN;
-               bp = (u_short *)p;
-               p += RFC1483LLC_LEN;
-               ether_type = ntohs(bp[3]);
-       } else {
-               ether_type = ETHERTYPE_IP;
-               bp = (u_short *)p;
-       }
-
-       /*
-        * Is it (gag) an 802.3 encapsulation?
-        */
-       extracted_ethertype = 0;
-       if (ether_type < ETHERMTU) {
-               /* Try to print the LLC-layer header & higher layers */
+       if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
+               /*
+                * LLC header is present.  Try to print it & higher layers.
+                */
                if (llc_print(p, length, caplen, NULL, NULL,
-                   &extracted_ethertype)==0) {
+                   &extracted_ethertype) == 0) {
                        /* ether_type not known, print raw packet */
                        if (!eflag)
-                               cip_print((u_char *)bp, length + RFC1483LLC_LEN);
+                               cip_print(p, length);
                        if (extracted_ethertype) {
                                printf("(LLC %s) ",
                               etherproto_string(htons(extracted_ethertype)));
@@ -146,16 +114,18 @@ cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
                        if (!xflag && !qflag)
                                default_print(p, caplen);
                }
-       } else if (ether_encap_print(ether_type, p, length, caplen,
-           &extracted_ethertype) == 0) {
-               /* ether_type not known, print raw packet */
-               if (!eflag)
-                       cip_print((u_char *)bp, length + RFC1483LLC_LEN);
-               if (!xflag && !qflag)
-                       default_print(p, caplen);
+       } else {
+               /*
+                * LLC header is absent; treat it as just IP.
+                */
+               ip_print(p, length);
        }
+
        if (xflag)
                default_print(p, caplen);
  out:
        putchar('\n');
+       --infodelay;
+       if (infoprint)
+               info(0);
 }