/* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 * 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. */ /* \summary: Ethernet printer */ #include #include "netdissect-stdinc.h" #define ND_LONGJMP_FROM_TCHECK #include "netdissect.h" #include "extract.h" #include "addrtoname.h" #include "ethertype.h" /* * Structure of an Ethernet header. */ struct ether_header { nd_mac_addr ether_dhost; nd_mac_addr ether_shost; nd_uint16_t ether_length_type; }; /* * Length of an Ethernet header; note that some compilers may pad * "struct ether_header" to a multiple of 4 bytes, for example, so * "sizeof (struct ether_header)" may not give the right answer. */ #define ETHER_HDRLEN 14 const struct tok ethertype_values[] = { { ETHERTYPE_IP, "IPv4" }, { ETHERTYPE_MPLS, "MPLS unicast" }, { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, { ETHERTYPE_IPV6, "IPv6" }, { ETHERTYPE_8021Q, "802.1Q" }, { ETHERTYPE_8021Q9100, "802.1Q-9100" }, { ETHERTYPE_8021QinQ, "802.1Q-QinQ" }, { ETHERTYPE_8021Q9200, "802.1Q-9200" }, { ETHERTYPE_MACSEC, "802.1AE MACsec" }, { ETHERTYPE_VMAN, "VMAN" }, { ETHERTYPE_PUP, "PUP" }, { ETHERTYPE_ARP, "ARP"}, { ETHERTYPE_REVARP, "Reverse ARP"}, { ETHERTYPE_NS, "NS" }, { ETHERTYPE_SPRITE, "Sprite" }, { ETHERTYPE_TRAIL, "Trail" }, { ETHERTYPE_MOPDL, "MOP DL" }, { ETHERTYPE_MOPRC, "MOP RC" }, { ETHERTYPE_DN, "DN" }, { ETHERTYPE_LAT, "LAT" }, { ETHERTYPE_SCA, "SCA" }, { ETHERTYPE_TEB, "TEB" }, { ETHERTYPE_LANBRIDGE, "Lanbridge" }, { ETHERTYPE_DECDNS, "DEC DNS" }, { ETHERTYPE_DECDTS, "DEC DTS" }, { ETHERTYPE_VEXP, "VEXP" }, { ETHERTYPE_VPROD, "VPROD" }, { ETHERTYPE_ATALK, "Appletalk" }, { ETHERTYPE_AARP, "Appletalk ARP" }, { ETHERTYPE_IPX, "IPX" }, { ETHERTYPE_PPP, "PPP" }, { ETHERTYPE_MPCP, "MPCP" }, { ETHERTYPE_SLOW, "Slow Protocols" }, { ETHERTYPE_PPPOED, "PPPoE D" }, { ETHERTYPE_PPPOES, "PPPoE S" }, { ETHERTYPE_EAPOL, "EAPOL" }, { ETHERTYPE_REALTEK, "Realtek protocols" }, { ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" }, { ETHERTYPE_JUMBO, "Jumbo" }, { ETHERTYPE_NSH, "NSH" }, { ETHERTYPE_LOOPBACK, "Loopback" }, { ETHERTYPE_ISO, "OSI" }, { ETHERTYPE_GRE_ISO, "GRE-OSI" }, { ETHERTYPE_CFM_OLD, "CFM (old)" }, { ETHERTYPE_CFM, "CFM" }, { ETHERTYPE_IEEE1905_1, "IEEE1905.1" }, { ETHERTYPE_LLDP, "LLDP" }, { ETHERTYPE_TIPC, "TIPC"}, { ETHERTYPE_GEONET_OLD, "GeoNet (old)"}, { ETHERTYPE_GEONET, "GeoNet"}, { ETHERTYPE_CALM_FAST, "CALM FAST"}, { ETHERTYPE_AOE, "AoE" }, { ETHERTYPE_PTP, "PTP" }, { ETHERTYPE_ARISTA, "Arista Vendor Specific Protocol" }, { 0, NULL} }; static void ether_addresses_print(netdissect_options *ndo, const u_char *src, const u_char *dst) { ND_PRINT("%s > %s, ", GET_ETHERADDR_STRING(src), GET_ETHERADDR_STRING(dst)); } static void ether_type_print(netdissect_options *ndo, uint16_t type) { if (!ndo->ndo_qflag) ND_PRINT("ethertype %s (0x%04x)", tok2str(ethertype_values, "Unknown", type), type); else ND_PRINT("%s", tok2str(ethertype_values, "Unknown Ethertype (0x%04x)", type)); } /* * Common code for printing Ethernet frames. * * It can handle Ethernet headers with extra tag information inserted * after the destination and source addresses, as is inserted by some * switch chips, and extra encapsulation header information before * printing Ethernet header information (such as a LANE ID for ATM LANE). */ static u_int ether_common_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen, void (*print_switch_tag)(netdissect_options *ndo, const u_char *), u_int switch_tag_len, void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg) { const struct ether_header *ehp; u_int orig_length; u_int hdrlen; u_short length_type; int printed_length; int llc_hdrlen; struct lladdr_info src, dst; if (length < caplen) { ND_PRINT("[length %u < caplen %u]", length, caplen); nd_print_invalid(ndo); return length; } if (caplen < ETHER_HDRLEN + switch_tag_len) { nd_print_trunc(ndo); return caplen; } if (print_encap_header != NULL) (*print_encap_header)(ndo, encap_header_arg); orig_length = length; /* * Get the source and destination addresses, skip past them, * and print them if we're printing the link-layer header. */ ehp = (const struct ether_header *)p; src.addr = ehp->ether_shost; src.addr_string = etheraddr_string; dst.addr = ehp->ether_dhost; dst.addr_string = etheraddr_string; length -= 2*MAC_ADDR_LEN; caplen -= 2*MAC_ADDR_LEN; p += 2*MAC_ADDR_LEN; hdrlen = 2*MAC_ADDR_LEN; if (ndo->ndo_eflag) ether_addresses_print(ndo, src.addr, dst.addr); /* * Print the switch tag, if we have one, and skip past it. */ if (print_switch_tag != NULL) (*print_switch_tag)(ndo, p); length -= switch_tag_len; caplen -= switch_tag_len; p += switch_tag_len; hdrlen += switch_tag_len; /* * Get the length/type field, skip past it, and print it * if we're printing the link-layer header. */ recurse: length_type = GET_BE_U_2(p); length -= 2; caplen -= 2; p += 2; hdrlen += 2; /* * Process 802.1AE MACsec headers. */ printed_length = 0; if (length_type == ETHERTYPE_MACSEC) { /* * MACsec, aka IEEE 802.1AE-2006 * Print the header, and try to print the payload if it's not encrypted */ if (ndo->ndo_eflag) { ether_type_print(ndo, length_type); ND_PRINT(", length %u: ", orig_length); printed_length = 1; } int ret = macsec_print(ndo, &p, &length, &caplen, &hdrlen, &src, &dst); if (ret == 0) { /* Payload is encrypted; print it as raw data. */ if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p, caplen); return hdrlen; } else if (ret > 0) { /* Problem printing the header; just quit. */ return ret; } else { /* * Keep processing type/length fields. */ length_type = GET_BE_U_2(p); ND_ICHECK_U(caplen, <, 2); length -= 2; caplen -= 2; p += 2; hdrlen += 2; } } /* * Process VLAN tag types. */ while (length_type == ETHERTYPE_8021Q || length_type == ETHERTYPE_8021Q9100 || length_type == ETHERTYPE_8021Q9200 || length_type == ETHERTYPE_8021QinQ) { /* * It has a VLAN tag. * Print VLAN information, and then go back and process * the enclosed type field. */ if (caplen < 4) { ndo->ndo_protocol = "vlan"; nd_print_trunc(ndo); return hdrlen + caplen; } if (length < 4) { ndo->ndo_protocol = "vlan"; nd_print_trunc(ndo); return hdrlen + length; } if (ndo->ndo_eflag) { uint16_t tag = GET_BE_U_2(p); ether_type_print(ndo, length_type); if (!printed_length) { ND_PRINT(", length %u: ", orig_length); printed_length = 1; } else ND_PRINT(", "); ND_PRINT("%s, ", ieee8021q_tci_string(tag)); } length_type = GET_BE_U_2(p + 2); p += 4; length -= 4; caplen -= 4; hdrlen += 4; } /* * We now have the final length/type field. */ if (length_type <= MAX_ETHERNET_LENGTH_VAL) { /* * It's a length field, containing the length of the * remaining payload; use it as such, as long as * it's not too large (bigger than the actual payload). */ if (length_type < length) { length = length_type; if (caplen > length) caplen = length; } /* * Cut off the snapshot length to the end of the * payload. */ if (!nd_push_snaplen(ndo, p, length)) { (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: can't push snaplen on buffer stack", __func__); } if (ndo->ndo_eflag) { ND_PRINT("802.3"); if (!printed_length) ND_PRINT(", length %u: ", length); } /* * An LLC header follows the length. Print that and * higher layers. */ llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); if (llc_hdrlen < 0) { /* packet type not known, print raw packet */ if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p, caplen); llc_hdrlen = -llc_hdrlen; } hdrlen += llc_hdrlen; nd_pop_packet_info(ndo); } else if (length_type == ETHERTYPE_JUMBO) { /* * It's a type field, with the type for Alteon jumbo frames. * See * * https://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 * * which indicates that, following the type field, * there's an LLC header and payload. */ /* Try to print the LLC-layer header & higher layers */ llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); if (llc_hdrlen < 0) { /* packet type not known, print raw packet */ if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p, caplen); llc_hdrlen = -llc_hdrlen; } hdrlen += llc_hdrlen; } else if (length_type == ETHERTYPE_ARISTA) { if (caplen < 2) { ND_PRINT("[|arista]"); return hdrlen + caplen; } if (length < 2) { ND_PRINT("[|arista]"); return hdrlen + length; } ether_type_print(ndo, length_type); ND_PRINT(", length %u: ", orig_length); int bytesConsumed = arista_ethertype_print(ndo, p, length); if (bytesConsumed > 0) { p += bytesConsumed; length -= bytesConsumed; caplen -= bytesConsumed; hdrlen += bytesConsumed; goto recurse; } else { /* subtype/version not known, print raw packet */ if (!ndo->ndo_eflag && length_type > MAX_ETHERNET_LENGTH_VAL) { ether_addresses_print(ndo, src.addr, dst.addr); ether_type_print(ndo, length_type); ND_PRINT(", length %u: ", orig_length); } if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p, caplen); } } else { /* * It's a type field with some other value. */ if (ndo->ndo_eflag) { ether_type_print(ndo, length_type); if (!printed_length) ND_PRINT(", length %u: ", orig_length); else ND_PRINT(", "); } if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) { /* type not known, print raw packet */ if (!ndo->ndo_eflag) { /* * We didn't print the full link-layer * header, as -e wasn't specified, so * print only the source and destination * MAC addresses and the final Ethernet * type. */ ether_addresses_print(ndo, src.addr, dst.addr); ether_type_print(ndo, length_type); ND_PRINT(", length %u: ", orig_length); } if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p, caplen); } } invalid: return hdrlen; } /* * Print an Ethernet frame while specifying a non-standard Ethernet header * length. * This might be encapsulated within another frame; we might be passed * a pointer to a function that can print header information for that * frame's protocol, and an argument to pass to that function. * * FIXME: caplen can and should be derived from ndo->ndo_snapend and p. */ u_int ether_switch_tag_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen, void (*print_switch_tag)(netdissect_options *, const u_char *), u_int switch_tag_len) { return ether_common_print(ndo, p, length, caplen, print_switch_tag, switch_tag_len, NULL, NULL); } /* * Print an Ethernet frame. * This might be encapsulated within another frame; we might be passed * a pointer to a function that can print header information for that * frame's protocol, and an argument to pass to that function. * * FIXME: caplen can and should be derived from ndo->ndo_snapend and p. */ u_int ether_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen, void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg) { ndo->ndo_protocol = "ether"; return ether_common_print(ndo, p, length, caplen, NULL, 0, print_encap_header, encap_header_arg); } /* * This is the top level routine of the printer. 'p' points * to the ether header of the packet, 'h->len' is the length * of the packet off the wire, and 'h->caplen' is the number * of bytes actually captured. */ void ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) { ndo->ndo_protocol = "ether"; ndo->ndo_ll_hdr_len += ether_print(ndo, p, h->len, h->caplen, NULL, NULL); } /* * This is the top level routine of the printer. 'p' points * to the ether header of the packet, 'h->len' is the length * of the packet off the wire, and 'h->caplen' is the number * of bytes actually captured. * * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header * before the Ethernet header. */ void netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) { /* * Fail if we don't have enough data for the Hilscher pseudo-header. */ ndo->ndo_protocol = "netanalyzer"; ND_TCHECK_LEN(p, 4); /* Skip the pseudo-header. */ ndo->ndo_ll_hdr_len += 4; ndo->ndo_ll_hdr_len += ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL); } /* * This is the top level routine of the printer. 'p' points * to the ether header of the packet, 'h->len' is the length * of the packet off the wire, and 'h->caplen' is the number * of bytes actually captured. * * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF * before the Ethernet header. */ void netanalyzer_transparent_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) { /* * Fail if we don't have enough data for the Hilscher pseudo-header, * preamble, and SOF. */ ndo->ndo_protocol = "netanalyzer_transparent"; ND_TCHECK_LEN(p, 12); /* Skip the pseudo-header, preamble, and SOF. */ ndo->ndo_ll_hdr_len += 12; ndo->ndo_ll_hdr_len += ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL); } /* * Prints the packet payload, given an Ethernet type code for the payload's * protocol. * * Returns non-zero if it can do so, zero if the ethertype is unknown. */ int ethertype_print(netdissect_options *ndo, u_short ether_type, const u_char *p, u_int length, u_int caplen, const struct lladdr_info *src, const struct lladdr_info *dst) { switch (ether_type) { case ETHERTYPE_IP: ip_print(ndo, p, length); return (1); case ETHERTYPE_IPV6: ip6_print(ndo, p, length); return (1); case ETHERTYPE_ARP: case ETHERTYPE_REVARP: arp_print(ndo, p, length, caplen); return (1); #ifndef TCPDUMP_MINI case ETHERTYPE_DN: decnet_print(ndo, p, length, caplen); return (1); case ETHERTYPE_ATALK: if (ndo->ndo_vflag) ND_PRINT("et1 "); atalk_print(ndo, p, length); return (1); case ETHERTYPE_AARP: aarp_print(ndo, p, length); return (1); case ETHERTYPE_IPX: ND_PRINT("(NOV-ETHII) "); ipx_print(ndo, p, length); return (1); case ETHERTYPE_ISO: if (length == 0 || caplen == 0) { ndo->ndo_protocol = "isoclns"; nd_print_trunc(ndo); return (1); } /* At least one byte is required */ /* FIXME: Reference for this byte? */ ND_TCHECK_LEN(p, 1); isoclns_print(ndo, p + 1, length - 1); return(1); #endif case ETHERTYPE_PPPOED: case ETHERTYPE_PPPOES: case ETHERTYPE_PPPOED2: case ETHERTYPE_PPPOES2: pppoe_print(ndo, p, length); return (1); case ETHERTYPE_EAPOL: eapol_print(ndo, p); return (1); #ifndef TCPDUMP_MINI case ETHERTYPE_REALTEK: rtl_print(ndo, p, length, src, dst); return (1); #endif case ETHERTYPE_PPP: if (length) { ND_PRINT(": "); ppp_print(ndo, p, length); } return (1); #ifndef TCPDUMP_MINI case ETHERTYPE_MPCP: mpcp_print(ndo, p, length); return (1); case ETHERTYPE_SLOW: slow_print(ndo, p, length); return (1); case ETHERTYPE_CFM: case ETHERTYPE_CFM_OLD: cfm_print(ndo, p, length); return (1); #endif case ETHERTYPE_LLDP: lldp_print(ndo, p, length); return (1); #ifndef TCPDUMP_MINI case ETHERTYPE_NSH: nsh_print(ndo, p, length); return (1); #endif case ETHERTYPE_LOOPBACK: loopback_print(ndo, p, length); return (1); #ifndef TCPDUMP_MINI case ETHERTYPE_MPLS: case ETHERTYPE_MPLS_MULTI: mpls_print(ndo, p, length); return (1); case ETHERTYPE_TIPC: tipc_print(ndo, p, length, caplen); return (1); case ETHERTYPE_MS_NLB_HB: msnlb_print(ndo, p); return (1); case ETHERTYPE_GEONET_OLD: case ETHERTYPE_GEONET: geonet_print(ndo, p, length, src); return (1); case ETHERTYPE_CALM_FAST: calm_fast_print(ndo, p, length, src); return (1); case ETHERTYPE_AOE: aoe_print(ndo, p, length); return (1); case ETHERTYPE_PTP: ptp_print(ndo, p, length); return (1); #endif case ETHERTYPE_LAT: case ETHERTYPE_SCA: case ETHERTYPE_MOPRC: case ETHERTYPE_MOPDL: case ETHERTYPE_IEEE1905_1: /* default_print for now */ default: return (0); } }