X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/7678647d1ad55f9d9976740e6e0dc97bc8377daf..2b4965f56167dfda7c60fc9db2d145698d948fd5:/print-atm.c diff --git a/print-atm.c b/print-atm.c index 189831a6..135898ba 100644 --- a/print-atm.c +++ b/print-atm.c @@ -19,8 +19,8 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.27 2002-12-04 19:12:39 hannes Exp $ (LBL)"; +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.49 2007-10-22 19:37:51 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -39,42 +39,177 @@ static const char rcsid[] = #include "ethertype.h" #include "atm.h" #include "atmuni31.h" +#include "llc.h" #include "ether.h" +#define OAM_CRC10_MASK 0x3ff +#define OAM_PAYLOAD_LEN 48 +#define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */ +#define OAM_CELLTYPE_FUNCTYPE_LEN 1 + +struct tok oam_f_values[] = { + { VCI_OAMF4SC, "OAM F4 (segment)" }, + { VCI_OAMF4EC, "OAM F4 (end)" }, + { 0, NULL } +}; + +struct tok atm_pty_values[] = { + { 0x0, "user data, uncongested, SDU 0" }, + { 0x1, "user data, uncongested, SDU 1" }, + { 0x2, "user data, congested, SDU 0" }, + { 0x3, "user data, congested, SDU 1" }, + { 0x4, "VCC OAM F5 flow segment" }, + { 0x5, "VCC OAM F5 flow end-to-end" }, + { 0x6, "Traffic Control and resource Mgmt" }, + { 0, NULL } +}; + +#define OAM_CELLTYPE_FM 0x1 +#define OAM_CELLTYPE_PM 0x2 +#define OAM_CELLTYPE_AD 0x8 +#define OAM_CELLTYPE_SM 0xf + +struct tok oam_celltype_values[] = { + { OAM_CELLTYPE_FM, "Fault Management" }, + { OAM_CELLTYPE_PM, "Performance Management" }, + { OAM_CELLTYPE_AD, "activate/deactivate" }, + { OAM_CELLTYPE_SM, "System Management" }, + { 0, NULL } +}; + +#define OAM_FM_FUNCTYPE_AIS 0x0 +#define OAM_FM_FUNCTYPE_RDI 0x1 +#define OAM_FM_FUNCTYPE_CONTCHECK 0x4 +#define OAM_FM_FUNCTYPE_LOOPBACK 0x8 + +struct tok oam_fm_functype_values[] = { + { OAM_FM_FUNCTYPE_AIS, "AIS" }, + { OAM_FM_FUNCTYPE_RDI, "RDI" }, + { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" }, + { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" }, + { 0, NULL } +}; + +struct tok oam_pm_functype_values[] = { + { 0x0, "Forward Monitoring" }, + { 0x1, "Backward Reporting" }, + { 0x2, "Monitoring and Reporting" }, + { 0, NULL } +}; + +struct tok oam_ad_functype_values[] = { + { 0x0, "Performance Monitoring" }, + { 0x1, "Continuity Check" }, + { 0, NULL } +}; + +#define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1 + +struct tok oam_fm_loopback_indicator_values[] = { + { 0x0, "Reply" }, + { 0x1, "Request" }, + { 0, NULL } +}; + +static const struct tok *oam_functype_values[16] = { + NULL, + oam_fm_functype_values, /* 1 */ + oam_pm_functype_values, /* 2 */ + NULL, + NULL, + NULL, + NULL, + NULL, + oam_ad_functype_values, /* 8 */ + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL +}; + +/* + * Print an RFC 1483 LLC-encapsulated ATM frame. + */ +static void +atm_llc_print(const u_char *p, int length, int caplen) +{ + u_short extracted_ethertype; + + if (!llc_print(p, length, caplen, NULL, NULL, + &extracted_ethertype)) { + /* ether_type not known, print raw packet */ + if (extracted_ethertype) { + printf("(LLC %s) ", + etherproto_string(htons(extracted_ethertype))); + } + if (!suppress_default_print) + default_print(p, caplen); + } +} + +/* + * Given a SAP value, generate the LLC header value for a UI packet + * with that SAP as the source and destination SAP. + */ +#define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) + /* * This is the top level routine of the printer. 'p' points * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, - * 'h->length' is the length of the packet off the wire, and 'h->caplen' + * 'h->len' is the length of the packet off the wire, and 'h->caplen' * is the number of bytes actually captured. */ -void -atm_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p) +u_int +atm_if_print(const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; - - ++infodelay; - ts_print(&h->ts); + u_int32_t llchdr; + u_int hdrlen = 0; if (caplen < 8) { printf("[|atm]"); - goto out; + return (caplen); } + /* Cisco Style NLPID ? */ + if (*p == LLC_UI) { + if (eflag) + printf("CNLPID "); + isoclns_print(p+1, length-1, caplen-1); + return hdrlen; + } + /* - * Some printers want to check that they're not walking off the - * end of the packet. - * Rather than pass it all the way down, we set this global. + * Extract the presumed LLC header into a variable, for quick + * testing. + * Then check for a header that's neither a header for a SNAP + * packet nor an RFC 2684 routed NLPID-formatted PDU nor + * an 802.2-but-no-SNAP IP packet. */ - snapend = p + caplen; - - if (EXTRACT_24BITS(p) == 0xaaaa03) { + llchdr = EXTRACT_24BITS(p); + if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && + llchdr != LLC_UI_HDR(LLCSAP_ISONS) && + llchdr != LLC_UI_HDR(LLCSAP_IP)) { /* * XXX - assume 802.6 MAC header from Fore driver. - * XXX - should we also assume it's not a MAC header - * if it begins with 0xfe 0xfe 0x03, for RFC 2684 - * routed NLPID-formatted PDUs? + * + * Unfortunately, the above list doesn't check for + * all known SAPs, doesn't check for headers where + * the source and destination SAP aren't the same, + * and doesn't check for non-UI frames. It also + * runs the risk of an 802.6 MAC header that happens + * to begin with one of those values being + * incorrectly treated as an 802.2 header. + * + * So is that Fore driver still around? And, if so, + * is it still putting 802.6 MAC headers on ATM + * packets? If so, could it be changed to use a + * new DLT_IEEE802_6 value if we added it? */ if (eflag) printf("%08x%08x %08x%08x ", @@ -85,15 +220,10 @@ atm_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p) p += 20; length -= 20; caplen -= 20; + hdrlen += 20; } - - /* lets call into the generic LLC handler */ - llc_print(p, length, caplen, NULL, NULL, NULL); - - if (xflag) - default_print(p, caplen); - out: - putchar('\n'); + atm_llc_print(p, length, caplen); + return (hdrlen); } /* @@ -162,40 +292,30 @@ atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, if (eflag) printf("VPI:%u VCI:%u ", vpi, vci); - /* - * Some printers want to check that they're not walking off the - * end of the packet. - * Rather than pass it all the way down, we set this global. - */ - snapend = p + caplen; - if (vpi == 0) { switch (vci) { - case PPC: + case VCI_PPC: sig_print(p, caplen); - goto out; + return; - case BCC: + case VCI_BCC: printf("broadcast sig: "); - goto out; - - case OAMF4SC: - printf("oamF4(segment): "); - goto out; + return; - case OAMF4EC: - printf("oamF4(end): "); - goto out; + case VCI_OAMF4SC: /* fall through */ + case VCI_OAMF4EC: + oam_print(p, length, ATM_OAM_HEC); + return; - case METAC: + case VCI_METAC: printf("meta: "); - goto out; + return; - case ILMIC: + case VCI_ILMIC: printf("ilmi: "); snmp_print(p, length); - goto out; + return; } } @@ -205,17 +325,125 @@ atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, default: /* * Assumes traffic is LLC if unknown. - * call into the generic LLC handler */ - llc_print(p, length, caplen, NULL, NULL, NULL); + atm_llc_print(p, length, caplen); break; case ATM_LANE: lane_print(p, length, caplen); break; } +} + +struct oam_fm_loopback_t { + u_int8_t loopback_indicator; + u_int8_t correlation_tag[4]; + u_int8_t loopback_id[12]; + u_int8_t source_id[12]; + u_int8_t unused[16]; +}; + +struct oam_fm_ais_rdi_t { + u_int8_t failure_type; + u_int8_t failure_location[16]; + u_int8_t unused[28]; +}; + +int +oam_print (const u_char *p, u_int length, u_int hec) { + + u_int32_t cell_header; + u_int16_t vpi, vci, cksum, cksum_shouldbe, idx; + u_int8_t cell_type, func_type, payload, clp; + + union { + const struct oam_fm_loopback_t *oam_fm_loopback; + const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi; + } oam_ptr; + + + cell_header = EXTRACT_32BITS(p+hec); + cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f; + func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f; + + vpi = (cell_header>>20)&0xff; + vci = (cell_header>>4)&0xffff; + payload = (cell_header>>1)&0x7; + clp = cell_header&0x1; + + printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u", + tok2str(oam_f_values, "OAM F5", vci), + vpi, vci, + tok2str(atm_pty_values, "Unknown", payload), + clp, length); + + if (!vflag) { + return 1; + } + + printf("\n\tcell-type %s (%u)", + tok2str(oam_celltype_values, "unknown", cell_type), + cell_type); + + if (oam_functype_values[cell_type] == NULL) + printf(", func-type unknown (%u)", func_type); + else + printf(", func-type %s (%u)", + tok2str(oam_functype_values[cell_type],"none",func_type), + func_type); + + p += ATM_HDR_LEN_NOHEC + hec; + + switch (cell_type << 4 | func_type) { + case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK): + oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); + printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x", + tok2str(oam_fm_loopback_indicator_values, + "Unknown", + oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK), + EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)); + printf("\n\tLocation-ID "); + for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) { + if (idx % 2) { + printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])); + } + } + printf("\n\tSource-ID "); + for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) { + if (idx % 2) { + printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])); + } + } + break; + + case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS): + case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI): + oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); + printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type); + printf("\n\tLocation-ID "); + for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) { + if (idx % 2) { + printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])); + } + } + break; + + case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK): + /* FIXME */ + break; + + default: + break; + } + + /* crc10 checksum verification */ + cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN) + & OAM_CRC10_MASK; + cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN); + + printf("\n\tcksum 0x%03x (%scorrect)", + cksum, + cksum_shouldbe == 0 ? "" : "in"); -out: - if (xflag) - default_print(p, caplen); + return 1; }