/* $NetBSD: print-sll.c,v 1.4 2004/09/27 23:04:25 dyoung Exp $ */ /* * 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 * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-sll.c,v 1.12.2.2 2003/11/16 08:51:44 guy Exp (LBL)"; #else __RCSID("$NetBSD: print-sll.c,v 1.4 2004/09/27 23:04:25 dyoung Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "ethertype.h" #include "ether.h" #include "sll.h" static inline void sll_print(register const struct sll_header *sllp, u_int length) { u_short halen; switch (ntohs(sllp->sll_pkttype)) { case LINUX_SLL_HOST: (void)printf("< "); break; case LINUX_SLL_BROADCAST: (void)printf("B "); break; case LINUX_SLL_MULTICAST: (void)printf("M "); break; case LINUX_SLL_OTHERHOST: (void)printf("P "); break; case LINUX_SLL_OUTGOING: (void)printf("> "); break; default: (void)printf("? "); break; } /* * XXX - check the link-layer address type value? * For now, we just assume 6 means Ethernet. * XXX - print others as strings of hex? */ halen = ntohs(sllp->sll_halen); if (halen == 6) (void)printf("%s ", etheraddr_string(sllp->sll_addr)); if (!qflag) (void)printf("%s ", etherproto_string(sllp->sll_protocol)); (void)printf("%d: ", length); } /* * This is the top level routine of the printer. 'p' points to the * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp, * 'h->length' is the length of the packet off the wire, and 'h->caplen' * is the number of bytes actually captured. */ u_int sll_if_print(const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; register const struct sll_header *sllp; u_short ether_type; u_short extracted_ethertype; if (caplen < SLL_HDR_LEN) { /* * XXX - this "can't happen" because "pcap-linux.c" always * adds this many bytes of header to every packet in a * cooked socket capture. */ printf("[|sll]"); return (caplen); } sllp = (const struct sll_header *)p; if (eflag) sll_print(sllp, length); /* * Go past the cooked-mode header. */ length -= SLL_HDR_LEN; caplen -= SLL_HDR_LEN; p += SLL_HDR_LEN; ether_type = ntohs(sllp->sll_protocol); /* * Is it (gag) an 802.3 encapsulation, or some non-Ethernet * packet type? */ extracted_ethertype = 0; if (ether_type <= ETHERMTU) { /* * Yes - what type is it? */ switch (ether_type) { case LINUX_SLL_P_802_3: /* * Ethernet_802.3 IPX frame. */ ipx_print(p, length); break; case LINUX_SLL_P_802_2: /* * 802.2. * Try to print the LLC-layer header & higher layers. */ if (llc_print(p, length, caplen, NULL, NULL, &extracted_ethertype) == 0) goto unknown; /* unknown LLC type */ break; default: unknown: /* ether_type not known, print raw packet */ if (!eflag) sll_print(sllp, length + SLL_HDR_LEN); if (extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p, caplen); break; } } else if (ether_encap_print(ether_type, p, length, caplen, &extracted_ethertype) == 0) { /* ether_type not known, print raw packet */ if (!eflag) sll_print(sllp, length + SLL_HDR_LEN); if (!xflag && !qflag) default_print(p, caplen); } return (SLL_HDR_LEN); }