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Diffstat (limited to 'print-sll.c')
| -rw-r--r-- | print-sll.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/print-sll.c b/print-sll.c new file mode 100644 index 0000000..a044de6 --- /dev/null +++ b/print-sll.c @@ -0,0 +1,231 @@ +/* + * 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. + */ +#ifndef lint +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <stdio.h> +#include <string.h> +#include <pcap.h> + +#include "interface.h" +#include "addrtoname.h" +#include "ethertype.h" +#include "extract.h" + +#include "ether.h" +#include "sll.h" + +const struct tok sll_pkttype_values[] = { + { LINUX_SLL_HOST, "In" }, + { LINUX_SLL_BROADCAST, "B" }, + { LINUX_SLL_MULTICAST, "M" }, + { LINUX_SLL_OTHERHOST, "P" }, + { LINUX_SLL_OUTGOING, "Out" }, + { 0, NULL} +}; + +static inline void +sll_print(register const struct sll_header *sllp, u_int length) +{ + u_short ether_type; + + printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))); + + /* + * XXX - check the link-layer address type value? + * For now, we just assume 6 means Ethernet. + * XXX - print others as strings of hex? + */ + if (EXTRACT_16BITS(&sllp->sll_halen) == 6) + (void)printf("%s ", etheraddr_string(sllp->sll_addr)); + + if (!qflag) { + ether_type = EXTRACT_16BITS(&sllp->sll_protocol); + + if (ether_type <= ETHERMTU) { + /* + * Not an Ethernet type; what type is it? + */ + switch (ether_type) { + + case LINUX_SLL_P_802_3: + /* + * Ethernet_802.3 IPX frame. + */ + (void)printf("802.3"); + break; + + case LINUX_SLL_P_802_2: + /* + * 802.2. + */ + (void)printf("802.2"); + break; + + default: + /* + * What is it? + */ + (void)printf("ethertype Unknown (0x%04x)", + ether_type); + break; + } + } else { + (void)printf("ethertype %s (0x%04x)", + tok2str(ethertype_values, "Unknown", ether_type), + ether_type); + } + (void)printf(", length %u: ", 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->len' 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 = EXTRACT_16BITS(&sllp->sll_protocol); + +recurse: + /* + * Is it (gag) an 802.3 encapsulation, or some non-Ethernet + * packet type? + */ + 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: + extracted_ethertype = 0; + /*FALLTHROUGH*/ + + 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 (!suppress_default_print) + default_print(p, caplen); + break; + } + } else if (ether_type == ETHERTYPE_8021Q) { + /* + * Print VLAN information, and then go back and process + * the enclosed type field. + */ + if (caplen < 4 || length < 4) { + printf("[|vlan]"); + return (SLL_HDR_LEN); + } + if (eflag) { + u_int16_t tag = EXTRACT_16BITS(p); + + printf("vlan %u, p %u%s, ", + tag & 0xfff, + tag >> 13, + (tag & 0x1000) ? ", CFI" : ""); + } + + ether_type = EXTRACT_16BITS(p + 2); + if (ether_type <= ETHERMTU) + ether_type = LINUX_SLL_P_802_2; + if (!qflag) { + (void)printf("ethertype %s, ", + tok2str(ethertype_values, "Unknown", ether_type)); + } + p += 4; + length -= 4; + caplen -= 4; + goto recurse; + } else { + if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) { + /* ether_type not known, print raw packet */ + if (!eflag) + sll_print(sllp, length + SLL_HDR_LEN); + if (!suppress_default_print) + default_print(p, caplen); + } + } + + return (SLL_HDR_LEN); +} |