#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.51 2001-09-17 21:57:54 fenner Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.54 2002-07-11 09:17:23 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
* arp_tha and arp_tpa in that order, according to the lengths
* specified. Field names used correspond to RFC 826.
*/
-struct arphdr {
+struct arp_pkthdr {
u_short ar_hrd; /* format of hardware address */
#define ARPHRD_ETHER 1 /* ethernet hardware format */
#define ARPHRD_IEEE802 6 /* token-ring hardware format */
u_char ar_tha[]; /* target hardware address */
u_char ar_tpa[]; /* target protocol address */
#endif
-#define ar_sha(ap) (((const caddr_t)((ap)+1))+0)
-#define ar_spa(ap) (((const caddr_t)((ap)+1))+ (ap)->ar_hln)
-#define ar_tha(ap) (((const caddr_t)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
-#define ar_tpa(ap) (((const caddr_t)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
+#define ar_sha(ap) (((const u_char *)((ap)+1))+0)
+#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
+#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
+#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
};
#define ARP_HDRLEN 8
#define THA(ap) (ar_tha(ap))
#define TPA(ap) (ar_tpa(ap))
+/*
+ * ATM Address Resolution Protocol.
+ *
+ * See RFC 2225 for protocol description. ARP packets are variable
+ * in size; the arphdr structure defines the fixed-length portion.
+ * Protocol type values are the same as those for 10 Mb/s Ethernet.
+ * It is followed by the variable-sized fields ar_sha, arp_spa,
+ * arp_tha and arp_tpa in that order, according to the lengths
+ * specified. Field names used correspond to RFC 826.
+ */
+struct atmarp_pkthdr {
+ u_short ar_hrd; /* format of hardware address */
+#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
+ u_short ar_pro; /* format of protocol address */
+ u_char ar_shtl; /* length of hardware address */
+ u_char ar_sstl; /* length of hardware address */
+ u_short ar_op; /* same as regular ARP */
+ u_char ar_spln;
+ u_char ar_thtl;
+ u_char ar_tstl;
+ u_char ar_tpln;
+/*
+ * The remaining fields are variable in size,
+ * according to the sizes above.
+ */
+#ifdef COMMENT_ONLY
+ u_char ar_sha[]; /* sender hardware address */
+ u_char ar_spa[]; /* sender protocol address */
+ u_char ar_tha[]; /* target hardware address */
+ u_char ar_tpa[]; /* target protocol address */
+#endif
+#define ar_sha(ap) (((const u_char *)((ap)+1))+0)
+#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
+#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
+#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
+};
+
static u_char ezero[6];
+static void
+atmarp_print(const u_char *bp, u_int length, u_int caplen)
+{
+ const struct arp_pkthdr *ap;
+ u_short pro, hrd, op;
+
+ ap = (const struct arp_pkthdr *)bp;
+ TCHECK(*ap);
+ if ((const u_char *)(ar_tpa(ap) + PLN(ap)) > snapend) {
+ (void)printf("truncated-arp");
+ default_print((const u_char *)ap, length);
+ return;
+ }
+
+ hrd = EXTRACT_16BITS(&HRD(ap));
+ if (hrd == ARPHRD_ATM2225)
+ atmarp_print(bp, length, caplen);
+ pro = EXTRACT_16BITS(&PRO(ap));
+ op = EXTRACT_16BITS(&OP(ap));
+
+ if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) {
+ (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
+ op, pro, PLN(ap), hrd, HLN(ap));
+ return;
+ }
+ if (pro == ETHERTYPE_TRAIL)
+ (void)printf("trailer-");
+ switch (op) {
+
+ case ARPOP_REQUEST:
+ (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
+ if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0)
+ (void)printf(" (%s)",
+ linkaddr_string(THA(ap), HLN(ap)));
+ (void)printf(" tell %s", ipaddr_string(SPA(ap)));
+ break;
+
+ case ARPOP_REPLY:
+ (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
+ (void)printf(" is-at %s", linkaddr_string(SHA(ap), HLN(ap)));
+ break;
+
+ case ARPOP_REVREQUEST:
+ (void)printf("rarp who-is %s tell %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ linkaddr_string(SHA(ap), HLN(ap)));
+ break;
+
+ case ARPOP_REVREPLY:
+ (void)printf("rarp reply %s at %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ ipaddr_string(TPA(ap)));
+ break;
+
+ case ARPOP_INVREQUEST:
+ (void)printf("invarp who-is %s tell %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ linkaddr_string(SHA(ap), HLN(ap)));
+ break;
+
+ case ARPOP_INVREPLY:
+ (void)printf("invarp reply %s at %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ ipaddr_string(TPA(ap)));
+ break;
+
+ default:
+ (void)printf("arp-#%d", op);
+ default_print((const u_char *)ap, caplen);
+ return;
+ }
+ if (hrd != ARPHRD_ETHER)
+ printf(" hardware #%d", hrd);
+ return;
+trunc:
+ (void)printf("[|arp]");
+}
+
void
arp_print(const u_char *bp, u_int length, u_int caplen)
{
- const struct arphdr *ap;
+ const struct arp_pkthdr *ap;
u_short pro, hrd, op;
- ap = (const struct arphdr *)bp;
+ ap = (const struct arp_pkthdr *)bp;
TCHECK(*ap);
if ((const u_char *)(ar_tpa(ap) + PLN(ap)) > snapend) {
(void)printf("truncated-arp");
return;
}
- pro = EXTRACT_16BITS(&PRO(ap));
hrd = EXTRACT_16BITS(&HRD(ap));
+ if (hrd == ARPHRD_ATM2225)
+ atmarp_print(bp, length, caplen);
+ pro = EXTRACT_16BITS(&PRO(ap));
op = EXTRACT_16BITS(&OP(ap));
if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) {
ipaddr_string(TPA(ap)));
break;
+ case ARPOP_INVREQUEST:
+ (void)printf("invarp who-is %s tell %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ linkaddr_string(SHA(ap), HLN(ap)));
+ break;
+
+ case ARPOP_INVREPLY:
+ (void)printf("invarp reply %s at %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ ipaddr_string(TPA(ap)));
+ break;
+
default:
(void)printf("arp-#%d", op);
default_print((const u_char *)ap, caplen);
projects / tcpdump / blobdiff