X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/49b23c5a9b0198bb382dcf43c458d46fcf2fa809..4dee61760d291060f08e68eed2e7a1b98ce7e4a4:/print-ether.c diff --git a/print-ether.c b/print-ether.c index 0f8c7dc5..373103dc 100644 --- a/print-ether.c +++ b/print-ether.c @@ -22,16 +22,31 @@ /* \summary: Ethernet printer */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include +#include "netdissect-stdinc.h" #include "netdissect.h" #include "extract.h" #include "addrtoname.h" #include "ethertype.h" -#include "ether.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" }, @@ -72,6 +87,7 @@ const struct tok ethertype_values[] = { { ETHERTYPE_RRCP, "RRCP" }, { ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" }, { ETHERTYPE_JUMBO, "Jumbo" }, + { ETHERTYPE_NSH, "NSH" }, { ETHERTYPE_LOOPBACK, "Loopback" }, { ETHERTYPE_ISO, "OSI" }, { ETHERTYPE_GRE_ISO, "GRE-OSI" }, @@ -88,37 +104,37 @@ const struct tok ethertype_values[] = { { 0, NULL} }; -static inline void +static void ether_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length) { - register const struct ether_header *ep; + const struct ether_header *ehp; uint16_t length_type; - ep = (const struct ether_header *)bp; + ehp = (const struct ether_header *)bp; - ND_PRINT((ndo, "%s > %s", - etheraddr_string(ndo, ESRC(ep)), - etheraddr_string(ndo, EDST(ep)))); + ND_PRINT("%s > %s", + etheraddr_string(ndo, ehp->ether_shost), + etheraddr_string(ndo, ehp->ether_dhost)); - length_type = EXTRACT_16BITS(&ep->ether_length_type); + length_type = EXTRACT_BE_U_2(ehp->ether_length_type); if (!ndo->ndo_qflag) { - if (length_type <= ETHERMTU) { - ND_PRINT((ndo, ", 802.3")); + if (length_type <= MAX_ETHERNET_LENGTH_VAL) { + ND_PRINT(", 802.3"); length = length_type; } else - ND_PRINT((ndo, ", ethertype %s (0x%04x)", + ND_PRINT(", ethertype %s (0x%04x)", tok2str(ethertype_values,"Unknown", length_type), - length_type)); + length_type); } else { - if (length_type <= ETHERMTU) { - ND_PRINT((ndo, ", 802.3")); + if (length_type <= MAX_ETHERNET_LENGTH_VAL) { + ND_PRINT(", 802.3"); length = length_type; } else - ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type))); + ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)); } - ND_PRINT((ndo, ", length %u: ", length)); + ND_PRINT(", length %u: ", length); } /* @@ -126,24 +142,28 @@ ether_hdr_print(netdissect_options *ndo, * 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) { - const struct ether_header *ep; + const struct ether_header *ehp; u_int orig_length; u_short length_type; u_int hdrlen; int llc_hdrlen; + struct lladdr_info src, dst; + ndo->ndo_protocol = "ether"; if (caplen < ETHER_HDRLEN) { - ND_PRINT((ndo, "[|ether]")); + nd_print_trunc(ndo); return (caplen); } if (length < ETHER_HDRLEN) { - ND_PRINT((ndo, "[|ether]")); + nd_print_trunc(ndo); return (length); } @@ -156,19 +176,23 @@ ether_print(netdissect_options *ndo, length -= ETHER_HDRLEN; caplen -= ETHER_HDRLEN; - ep = (const struct ether_header *)p; + ehp = (const struct ether_header *)p; p += ETHER_HDRLEN; hdrlen = ETHER_HDRLEN; - length_type = EXTRACT_16BITS(&ep->ether_length_type); + src.addr = ehp->ether_shost; + src.addr_string = etheraddr_string; + dst.addr = ehp->ether_dhost; + dst.addr_string = etheraddr_string; + length_type = EXTRACT_BE_U_2(ehp->ether_length_type); recurse: /* * Is it (gag) an 802.3 encapsulation? */ - if (length_type <= ETHERMTU) { + if (length_type <= MAX_ETHERNET_LENGTH_VAL) { /* Try to print the LLC-layer header & higher layers */ - llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep)); + 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) @@ -185,22 +209,22 @@ recurse: * the enclosed type field. */ if (caplen < 4) { - ND_PRINT((ndo, "[|vlan]")); + ND_PRINT("[|vlan]"); return (hdrlen + caplen); } if (length < 4) { - ND_PRINT((ndo, "[|vlan]")); + ND_PRINT("[|vlan]"); return (hdrlen + length); } if (ndo->ndo_eflag) { - uint16_t tag = EXTRACT_16BITS(p); + uint16_t tag = EXTRACT_BE_U_2(p); - ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag))); + ND_PRINT("%s, ", ieee8021q_tci_string(tag)); } - length_type = EXTRACT_16BITS(p + 2); - if (ndo->ndo_eflag && length_type > ETHERMTU) - ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type))); + length_type = EXTRACT_BE_U_2(p + 2); + if (ndo->ndo_eflag && length_type > MAX_ETHERNET_LENGTH_VAL) + ND_PRINT("ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)); p += 4; length -= 4; caplen -= 4; @@ -217,7 +241,7 @@ recurse: * there's an LLC header and payload. */ /* Try to print the LLC-layer header & higher layers */ - llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep)); + 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) @@ -226,12 +250,12 @@ recurse: } hdrlen += llc_hdrlen; } else { - if (ethertype_print(ndo, length_type, p, length, caplen) == 0) { + if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) { /* type not known, print raw packet */ if (!ndo->ndo_eflag) { if (print_encap_header != NULL) (*print_encap_header)(ndo, encap_header_arg); - ether_hdr_print(ndo, (const u_char *)ep, orig_length); + ether_hdr_print(ndo, (const u_char *)ehp, orig_length); } if (!ndo->ndo_suppress_default_print) @@ -251,6 +275,7 @@ u_int ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) { + ndo->ndo_protocol = "ether_if"; return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL)); } @@ -270,8 +295,9 @@ netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, /* * Fail if we don't have enough data for the Hilscher pseudo-header. */ + ndo->ndo_protocol = "netanalyzer_if"; if (h->len < 4 || h->caplen < 4) { - ND_PRINT((ndo, "[|netanalyzer]")); + nd_print_trunc(ndo); return (h->caplen); } @@ -298,8 +324,9 @@ netanalyzer_transparent_if_print(netdissect_options *ndo, * Fail if we don't have enough data for the Hilscher pseudo-header, * preamble, and SOF. */ + ndo->ndo_protocol = "netanalyzer_transparent_if"; if (h->len < 12 || h->caplen < 12) { - ND_PRINT((ndo, "[|netanalyzer-transparent]")); + nd_print_trunc(ndo); return (h->caplen); } @@ -317,7 +344,8 @@ netanalyzer_transparent_if_print(netdissect_options *ndo, int ethertype_print(netdissect_options *ndo, u_short ether_type, const u_char *p, - u_int length, u_int caplen) + u_int length, u_int caplen, + const struct lladdr_info *src, const struct lladdr_info *dst) { switch (ether_type) { @@ -340,7 +368,7 @@ ethertype_print(netdissect_options *ndo, case ETHERTYPE_ATALK: if (ndo->ndo_vflag) - ND_PRINT((ndo, "et1 ")); + ND_PRINT("et1 "); atalk_print(ndo, p, length); return (1); @@ -349,12 +377,16 @@ ethertype_print(netdissect_options *ndo, return (1); case ETHERTYPE_IPX: - ND_PRINT((ndo, "(NOV-ETHII) ")); + ND_PRINT("(NOV-ETHII) "); ipx_print(ndo, p, length); return (1); case ETHERTYPE_ISO: - isoclns_print(ndo, p + 1, length - 1, length - 1); + if (length == 0 || caplen == 0) { + ND_PRINT(" [|osi]"); + return (1); + } + isoclns_print(ndo, p + 1, length - 1); return(1); case ETHERTYPE_PPPOED: @@ -369,12 +401,12 @@ ethertype_print(netdissect_options *ndo, return (1); case ETHERTYPE_RRCP: - rrcp_print(ndo, p - 14 , length + 14); + rrcp_print(ndo, p, length, src, dst); return (1); case ETHERTYPE_PPP: if (length) { - ND_PRINT((ndo, ": ")); + ND_PRINT(": "); ppp_print(ndo, p, length); } return (1); @@ -396,6 +428,10 @@ ethertype_print(netdissect_options *ndo, lldp_print(ndo, p, length); return (1); + case ETHERTYPE_NSH: + nsh_print(ndo, p, length); + return (1); + case ETHERTYPE_LOOPBACK: loopback_print(ndo, p, length); return (1); @@ -415,11 +451,11 @@ ethertype_print(netdissect_options *ndo, case ETHERTYPE_GEONET_OLD: case ETHERTYPE_GEONET: - geonet_print(ndo, p-14, p, length); + geonet_print(ndo, p, length, src); return (1); case ETHERTYPE_CALM_FAST: - calm_fast_print(ndo, p-14, p, length); + calm_fast_print(ndo, p, length, src); return (1); case ETHERTYPE_AOE: @@ -427,7 +463,7 @@ ethertype_print(netdissect_options *ndo, return (1); case ETHERTYPE_MEDSA: - medsa_print(ndo, p, length, caplen); + medsa_print(ndo, p, length, caplen, src, dst); return (1); case ETHERTYPE_LAT: @@ -440,12 +476,3 @@ ethertype_print(netdissect_options *ndo, return (0); } } - - -/* - * Local Variables: - * c-style: whitesmith - * c-basic-offset: 8 - * End: - */ -