| /* |
| * 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, and (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. |
| * 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. |
| * |
| * Original code by Hannes Gredler ([email protected]) |
| * and Steinar Haug ([email protected]) |
| */ |
| |
| /* \summary: Label Distribution Protocol (LDP) printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #include "netdissect.h" |
| #include "extract.h" |
| #include "addrtoname.h" |
| |
| #include "l2vpn.h" |
| #include "af.h" |
| |
| |
| /* |
| * ldp common header |
| * |
| * 0 1 2 3 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Version | PDU Length | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | LDP Identifier | |
| * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| */ |
| |
| struct ldp_common_header { |
| nd_uint16_t version; |
| nd_uint16_t pdu_length; |
| nd_ipv4 lsr_id; |
| nd_uint16_t label_space; |
| }; |
| |
| #define LDP_VERSION 1 |
| |
| /* |
| * ldp message header |
| * |
| * 0 1 2 3 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |U| Message Type | Message Length | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Message ID | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * + + |
| * | Mandatory Parameters | |
| * + + |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * + + |
| * | Optional Parameters | |
| * + + |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| |
| struct ldp_msg_header { |
| nd_uint16_t type; |
| nd_uint16_t length; |
| nd_uint32_t id; |
| }; |
| |
| #define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff) |
| #define LDP_MASK_U_BIT(x) ((x)&0x8000) |
| |
| #define LDP_MSG_NOTIF 0x0001 |
| #define LDP_MSG_HELLO 0x0100 |
| #define LDP_MSG_INIT 0x0200 |
| #define LDP_MSG_KEEPALIVE 0x0201 |
| #define LDP_MSG_ADDRESS 0x0300 |
| #define LDP_MSG_ADDRESS_WITHDRAW 0x0301 |
| #define LDP_MSG_LABEL_MAPPING 0x0400 |
| #define LDP_MSG_LABEL_REQUEST 0x0401 |
| #define LDP_MSG_LABEL_WITHDRAW 0x0402 |
| #define LDP_MSG_LABEL_RELEASE 0x0403 |
| #define LDP_MSG_LABEL_ABORT_REQUEST 0x0404 |
| |
| #define LDP_VENDOR_PRIVATE_MIN 0x3e00 |
| #define LDP_VENDOR_PRIVATE_MAX 0x3eff |
| #define LDP_EXPERIMENTAL_MIN 0x3f00 |
| #define LDP_EXPERIMENTAL_MAX 0x3fff |
| |
| static const struct tok ldp_msg_values[] = { |
| { LDP_MSG_NOTIF, "Notification" }, |
| { LDP_MSG_HELLO, "Hello" }, |
| { LDP_MSG_INIT, "Initialization" }, |
| { LDP_MSG_KEEPALIVE, "Keepalive" }, |
| { LDP_MSG_ADDRESS, "Address" }, |
| { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" }, |
| { LDP_MSG_LABEL_MAPPING, "Label Mapping" }, |
| { LDP_MSG_LABEL_REQUEST, "Label Request" }, |
| { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" }, |
| { LDP_MSG_LABEL_RELEASE, "Label Release" }, |
| { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" }, |
| { 0, NULL} |
| }; |
| |
| #define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff) |
| #define LDP_MASK_F_BIT(x) ((x)&0x4000) |
| |
| #define LDP_TLV_FEC 0x0100 |
| #define LDP_TLV_ADDRESS_LIST 0x0101 |
| #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2 |
| #define LDP_TLV_HOP_COUNT 0x0103 |
| #define LDP_TLV_PATH_VECTOR 0x0104 |
| #define LDP_TLV_GENERIC_LABEL 0x0200 |
| #define LDP_TLV_ATM_LABEL 0x0201 |
| #define LDP_TLV_FR_LABEL 0x0202 |
| #define LDP_TLV_STATUS 0x0300 |
| #define LDP_TLV_EXTD_STATUS 0x0301 |
| #define LDP_TLV_RETURNED_PDU 0x0302 |
| #define LDP_TLV_RETURNED_MSG 0x0303 |
| #define LDP_TLV_COMMON_HELLO 0x0400 |
| #define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401 |
| #define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402 |
| #define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403 |
| #define LDP_TLV_COMMON_SESSION 0x0500 |
| #define LDP_TLV_ATM_SESSION_PARM 0x0501 |
| #define LDP_TLV_FR_SESSION_PARM 0x0502 |
| #define LDP_TLV_FT_SESSION 0x0503 |
| #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600 |
| #define LDP_TLV_MTU 0x0601 /* rfc 3988 */ |
| |
| static const struct tok ldp_tlv_values[] = { |
| { LDP_TLV_FEC, "FEC" }, |
| { LDP_TLV_ADDRESS_LIST, "Address List" }, |
| { LDP_TLV_HOP_COUNT, "Hop Count" }, |
| { LDP_TLV_PATH_VECTOR, "Path Vector" }, |
| { LDP_TLV_GENERIC_LABEL, "Generic Label" }, |
| { LDP_TLV_ATM_LABEL, "ATM Label" }, |
| { LDP_TLV_FR_LABEL, "Frame-Relay Label" }, |
| { LDP_TLV_STATUS, "Status" }, |
| { LDP_TLV_EXTD_STATUS, "Extended Status" }, |
| { LDP_TLV_RETURNED_PDU, "Returned PDU" }, |
| { LDP_TLV_RETURNED_MSG, "Returned Message" }, |
| { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" }, |
| { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" }, |
| { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" }, |
| { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" }, |
| { LDP_TLV_COMMON_SESSION, "Common Session Parameters" }, |
| { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" }, |
| { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" }, |
| { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" }, |
| { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" }, |
| { LDP_TLV_MTU, "MTU" }, |
| { 0, NULL} |
| }; |
| |
| #define LDP_FEC_WILDCARD 0x01 |
| #define LDP_FEC_PREFIX 0x02 |
| #define LDP_FEC_HOSTADDRESS 0x03 |
| /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */ |
| #define LDP_FEC_MARTINI_VC 0x80 |
| |
| static const struct tok ldp_fec_values[] = { |
| { LDP_FEC_WILDCARD, "Wildcard" }, |
| { LDP_FEC_PREFIX, "Prefix" }, |
| { LDP_FEC_HOSTADDRESS, "Host address" }, |
| { LDP_FEC_MARTINI_VC, "Martini VC" }, |
| { 0, NULL} |
| }; |
| |
| #define LDP_FEC_MARTINI_IFPARM_MTU 0x01 |
| #define LDP_FEC_MARTINI_IFPARM_DESC 0x03 |
| #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c |
| |
| static const struct tok ldp_fec_martini_ifparm_values[] = { |
| { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" }, |
| { LDP_FEC_MARTINI_IFPARM_DESC, "Description" }, |
| { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" }, |
| { 0, NULL} |
| }; |
| |
| /* draft-ietf-pwe3-vccv-04.txt */ |
| static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = { |
| { 0x01, "PWE3 control word" }, |
| { 0x02, "MPLS Router Alert Label" }, |
| { 0x04, "MPLS inner label TTL = 1" }, |
| { 0, NULL} |
| }; |
| |
| /* draft-ietf-pwe3-vccv-04.txt */ |
| static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = { |
| { 0x01, "ICMP Ping" }, |
| { 0x02, "LSP Ping" }, |
| { 0x04, "BFD" }, |
| { 0, NULL} |
| }; |
| |
| static int ldp_pdu_print(netdissect_options *, const u_char *); |
| |
| /* |
| * ldp tlv header |
| * |
| * 0 1 2 3 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |U|F| Type | Length | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | Value | |
| * ~ ~ |
| * | | |
| * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| |
| #define TLV_TCHECK(minlen) \ |
| ND_TCHECK_LEN(tptr, minlen); if (tlv_tlen < minlen) goto badtlv; |
| |
| static int |
| ldp_tlv_print(netdissect_options *ndo, |
| const u_char *tptr, |
| u_short msg_tlen) |
| { |
| struct ldp_tlv_header { |
| nd_uint16_t type; |
| nd_uint16_t length; |
| }; |
| |
| const struct ldp_tlv_header *ldp_tlv_header; |
| u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags; |
| u_char fec_type; |
| u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx; |
| char buf[100]; |
| int i; |
| |
| ldp_tlv_header = (const struct ldp_tlv_header *)tptr; |
| ND_TCHECK_SIZE(ldp_tlv_header); |
| tlv_len=EXTRACT_BE_U_2(ldp_tlv_header->length); |
| if (tlv_len + 4 > msg_tlen) { |
| ND_PRINT("\n\t\t TLV contents go past end of message"); |
| return 0; |
| } |
| tlv_tlen=tlv_len; |
| tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_BE_U_2(ldp_tlv_header->type)); |
| |
| /* FIXME vendor private / experimental check */ |
| ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]", |
| tok2str(ldp_tlv_values, |
| "Unknown", |
| tlv_type), |
| tlv_type, |
| tlv_len, |
| LDP_MASK_U_BIT(EXTRACT_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore", |
| LDP_MASK_F_BIT(EXTRACT_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't"); |
| |
| tptr+=sizeof(struct ldp_tlv_header); |
| |
| switch(tlv_type) { |
| |
| case LDP_TLV_COMMON_HELLO: |
| TLV_TCHECK(4); |
| ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]", |
| EXTRACT_BE_U_2(tptr), |
| (EXTRACT_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link", |
| (EXTRACT_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : ""); |
| break; |
| |
| case LDP_TLV_IPV4_TRANSPORT_ADDR: |
| TLV_TCHECK(4); |
| ND_PRINT("\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr)); |
| break; |
| case LDP_TLV_IPV6_TRANSPORT_ADDR: |
| TLV_TCHECK(16); |
| ND_PRINT("\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, tptr)); |
| break; |
| case LDP_TLV_CONFIG_SEQ_NUMBER: |
| TLV_TCHECK(4); |
| ND_PRINT("\n\t Sequence Number: %u", EXTRACT_BE_U_4(tptr)); |
| break; |
| |
| case LDP_TLV_ADDRESS_LIST: |
| TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN); |
| af = EXTRACT_BE_U_2(tptr); |
| tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN; |
| tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN; |
| ND_PRINT("\n\t Address Family: %s, addresses", |
| tok2str(af_values, "Unknown (%u)", af)); |
| switch (af) { |
| case AFNUM_INET: |
| while(tlv_tlen >= sizeof(nd_ipv4)) { |
| ND_TCHECK_LEN(tptr, sizeof(nd_ipv4)); |
| ND_PRINT(" %s", ipaddr_string(ndo, tptr)); |
| tlv_tlen-=sizeof(nd_ipv4); |
| tptr+=sizeof(nd_ipv4); |
| } |
| break; |
| case AFNUM_INET6: |
| while(tlv_tlen >= sizeof(nd_ipv6)) { |
| ND_TCHECK_LEN(tptr, sizeof(nd_ipv6)); |
| ND_PRINT(" %s", ip6addr_string(ndo, tptr)); |
| tlv_tlen-=sizeof(nd_ipv6); |
| tptr+=sizeof(nd_ipv6); |
| } |
| break; |
| default: |
| /* unknown AF */ |
| break; |
| } |
| break; |
| |
| case LDP_TLV_COMMON_SESSION: |
| TLV_TCHECK(8); |
| ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]", |
| EXTRACT_BE_U_2(tptr), EXTRACT_BE_U_2(tptr + 2), |
| (EXTRACT_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited", |
| (EXTRACT_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled" |
| ); |
| break; |
| |
| case LDP_TLV_FEC: |
| TLV_TCHECK(1); |
| fec_type = EXTRACT_U_1(tptr); |
| ND_PRINT("\n\t %s FEC (0x%02x)", |
| tok2str(ldp_fec_values, "Unknown", fec_type), |
| fec_type); |
| |
| tptr+=1; |
| tlv_tlen-=1; |
| switch(fec_type) { |
| |
| case LDP_FEC_WILDCARD: |
| break; |
| case LDP_FEC_PREFIX: |
| TLV_TCHECK(2); |
| af = EXTRACT_BE_U_2(tptr); |
| tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN; |
| tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN; |
| if (af == AFNUM_INET) { |
| i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf)); |
| if (i == -2) |
| goto trunc; |
| if (i == -3) |
| ND_PRINT(": IPv4 prefix (goes past end of TLV)"); |
| else if (i == -1) |
| ND_PRINT(": IPv4 prefix (invalid length)"); |
| else |
| ND_PRINT(": IPv4 prefix %s", buf); |
| } |
| else if (af == AFNUM_INET6) { |
| i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf)); |
| if (i == -2) |
| goto trunc; |
| if (i == -3) |
| ND_PRINT(": IPv4 prefix (goes past end of TLV)"); |
| else if (i == -1) |
| ND_PRINT(": IPv6 prefix (invalid length)"); |
| else |
| ND_PRINT(": IPv6 prefix %s", buf); |
| } |
| else |
| ND_PRINT(": Address family %u prefix", af); |
| break; |
| case LDP_FEC_HOSTADDRESS: |
| break; |
| case LDP_FEC_MARTINI_VC: |
| /* |
| * We assume the type was supposed to be one of the MPLS |
| * Pseudowire Types. |
| */ |
| TLV_TCHECK(7); |
| vc_info_len = EXTRACT_U_1(tptr + 2); |
| |
| /* |
| * According to RFC 4908, the VC info Length field can be zero, |
| * in which case not only are there no interface parameters, |
| * there's no VC ID. |
| */ |
| if (vc_info_len == 0) { |
| ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u", |
| tok2str(mpls_pw_types_values, "Unknown", EXTRACT_BE_U_2(tptr)&0x7fff), |
| EXTRACT_BE_U_2(tptr)&0x8000 ? "" : "no ", |
| EXTRACT_BE_U_4(tptr + 3), |
| vc_info_len); |
| break; |
| } |
| |
| /* Make sure we have the VC ID as well */ |
| TLV_TCHECK(11); |
| ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u", |
| tok2str(mpls_pw_types_values, "Unknown", EXTRACT_BE_U_2(tptr)&0x7fff), |
| EXTRACT_BE_U_2(tptr)&0x8000 ? "" : "no ", |
| EXTRACT_BE_U_4(tptr + 3), |
| EXTRACT_BE_U_4(tptr + 7), |
| vc_info_len); |
| if (vc_info_len < 4) { |
| /* minimum 4, for the VC ID */ |
| ND_PRINT(" (invalid, < 4"); |
| return(tlv_len+4); /* Type & Length fields not included */ |
| } |
| vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */ |
| |
| /* Skip past the fixed information and the VC ID */ |
| tptr+=11; |
| tlv_tlen-=11; |
| TLV_TCHECK(vc_info_len); |
| |
| while (vc_info_len > 2) { |
| vc_info_tlv_type = EXTRACT_U_1(tptr); |
| vc_info_tlv_len = EXTRACT_U_1(tptr + 1); |
| if (vc_info_tlv_len < 2) |
| break; |
| if (vc_info_len < vc_info_tlv_len) |
| break; |
| |
| ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u", |
| tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type), |
| vc_info_tlv_type, |
| vc_info_tlv_len); |
| |
| switch(vc_info_tlv_type) { |
| case LDP_FEC_MARTINI_IFPARM_MTU: |
| ND_PRINT(": %u", EXTRACT_BE_U_2(tptr + 2)); |
| break; |
| |
| case LDP_FEC_MARTINI_IFPARM_DESC: |
| ND_PRINT(": "); |
| for (idx = 2; idx < vc_info_tlv_len; idx++) |
| fn_print_char(ndo, EXTRACT_U_1(tptr + idx)); |
| break; |
| |
| case LDP_FEC_MARTINI_IFPARM_VCCV: |
| ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]", |
| EXTRACT_U_1((tptr + 2)), |
| bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", EXTRACT_U_1((tptr + 2)))); |
| ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]", |
| EXTRACT_U_1((tptr + 3)), |
| bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", EXTRACT_U_1((tptr + 3)))); |
| break; |
| |
| default: |
| print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2); |
| break; |
| } |
| |
| vc_info_len -= vc_info_tlv_len; |
| tptr += vc_info_tlv_len; |
| } |
| break; |
| } |
| |
| break; |
| |
| case LDP_TLV_GENERIC_LABEL: |
| TLV_TCHECK(4); |
| ND_PRINT("\n\t Label: %u", EXTRACT_BE_U_4(tptr) & 0xfffff); |
| break; |
| |
| case LDP_TLV_STATUS: |
| TLV_TCHECK(8); |
| ui = EXTRACT_BE_U_4(tptr); |
| tptr+=4; |
| ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]", |
| ui&0x3fffffff, |
| ui&0x80000000 ? "Fatal error" : "Advisory Notification", |
| ui&0x40000000 ? "do" : "don't"); |
| ui = EXTRACT_BE_U_4(tptr); |
| tptr+=4; |
| if (ui) |
| ND_PRINT(", causing Message ID: 0x%08x", ui); |
| break; |
| |
| case LDP_TLV_FT_SESSION: |
| TLV_TCHECK(8); |
| ft_flags = EXTRACT_BE_U_2(tptr); |
| ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]", |
| ft_flags&0x8000 ? "" : "No ", |
| ft_flags&0x8 ? "" : "Don't ", |
| ft_flags&0x4 ? "" : "No ", |
| ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels", |
| ft_flags&0x1 ? "" : "Don't "); |
| tptr+=4; |
| ui = EXTRACT_BE_U_4(tptr); |
| if (ui) |
| ND_PRINT(", Reconnect Timeout: %ums", ui); |
| tptr+=4; |
| ui = EXTRACT_BE_U_4(tptr); |
| if (ui) |
| ND_PRINT(", Recovery Time: %ums", ui); |
| break; |
| |
| case LDP_TLV_MTU: |
| TLV_TCHECK(2); |
| ND_PRINT("\n\t MTU: %u", EXTRACT_BE_U_2(tptr)); |
| break; |
| |
| |
| /* |
| * FIXME those are the defined TLVs that lack a decoder |
| * you are welcome to contribute code ;-) |
| */ |
| |
| case LDP_TLV_HOP_COUNT: |
| case LDP_TLV_PATH_VECTOR: |
| case LDP_TLV_ATM_LABEL: |
| case LDP_TLV_FR_LABEL: |
| case LDP_TLV_EXTD_STATUS: |
| case LDP_TLV_RETURNED_PDU: |
| case LDP_TLV_RETURNED_MSG: |
| case LDP_TLV_ATM_SESSION_PARM: |
| case LDP_TLV_FR_SESSION_PARM: |
| case LDP_TLV_LABEL_REQUEST_MSG_ID: |
| |
| default: |
| if (ndo->ndo_vflag <= 1) |
| print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen); |
| break; |
| } |
| return(tlv_len+4); /* Type & Length fields not included */ |
| |
| trunc: |
| nd_print_trunc(ndo); |
| return 0; |
| |
| badtlv: |
| ND_PRINT("\n\t\t TLV contents go past end of TLV"); |
| return(tlv_len+4); /* Type & Length fields not included */ |
| } |
| |
| void |
| ldp_print(netdissect_options *ndo, |
| const u_char *pptr, u_int len) |
| { |
| int processed; |
| |
| ndo->ndo_protocol = "ldp"; |
| while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) { |
| processed = ldp_pdu_print(ndo, pptr); |
| if (processed == 0) |
| return; |
| len -= processed; |
| pptr += processed; |
| } |
| } |
| |
| static int |
| ldp_pdu_print(netdissect_options *ndo, |
| const u_char *pptr) |
| { |
| const struct ldp_common_header *ldp_com_header; |
| const struct ldp_msg_header *ldp_msg_header; |
| const u_char *tptr,*msg_tptr; |
| u_short tlen; |
| u_short pdu_len,msg_len,msg_type,msg_tlen; |
| int hexdump,processed; |
| |
| ldp_com_header = (const struct ldp_common_header *)pptr; |
| ND_TCHECK_SIZE(ldp_com_header); |
| |
| /* |
| * Sanity checking of the header. |
| */ |
| if (EXTRACT_BE_U_2(ldp_com_header->version) != LDP_VERSION) { |
| ND_PRINT("%sLDP version %u packet not supported", |
| (ndo->ndo_vflag < 1) ? "" : "\n\t", |
| EXTRACT_BE_U_2(ldp_com_header->version)); |
| return 0; |
| } |
| |
| pdu_len = EXTRACT_BE_U_2(ldp_com_header->pdu_length); |
| if (pdu_len < sizeof(struct ldp_common_header)-4) { |
| /* length too short */ |
| ND_PRINT("%sLDP, pdu-length: %u (too short, < %u)", |
| (ndo->ndo_vflag < 1) ? "" : "\n\t", |
| pdu_len, |
| (u_int)(sizeof(struct ldp_common_header)-4)); |
| return 0; |
| } |
| |
| /* print the LSR-ID, label-space & length */ |
| ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u", |
| (ndo->ndo_vflag < 1) ? "" : "\n\t", |
| ipaddr_string(ndo, ldp_com_header->lsr_id), |
| EXTRACT_BE_U_2(ldp_com_header->label_space), |
| pdu_len); |
| |
| /* bail out if non-verbose */ |
| if (ndo->ndo_vflag < 1) |
| return 0; |
| |
| /* ok they seem to want to know everything - lets fully decode it */ |
| tptr = pptr + sizeof(struct ldp_common_header); |
| tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */ |
| |
| while(tlen>0) { |
| /* did we capture enough for fully decoding the msg header ? */ |
| ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header)); |
| |
| ldp_msg_header = (const struct ldp_msg_header *)tptr; |
| msg_len=EXTRACT_BE_U_2(ldp_msg_header->length); |
| msg_type=LDP_MASK_MSG_TYPE(EXTRACT_BE_U_2(ldp_msg_header->type)); |
| |
| if (msg_len < sizeof(struct ldp_msg_header)-4) { |
| /* length too short */ |
| /* FIXME vendor private / experimental check */ |
| ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %u)", |
| tok2str(ldp_msg_values, |
| "Unknown", |
| msg_type), |
| msg_type, |
| msg_len, |
| (u_int)(sizeof(struct ldp_msg_header)-4)); |
| return 0; |
| } |
| |
| /* FIXME vendor private / experimental check */ |
| ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]", |
| tok2str(ldp_msg_values, |
| "Unknown", |
| msg_type), |
| msg_type, |
| msg_len, |
| EXTRACT_BE_U_4(ldp_msg_header->id), |
| LDP_MASK_U_BIT(EXTRACT_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore"); |
| |
| msg_tptr=tptr+sizeof(struct ldp_msg_header); |
| msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */ |
| |
| /* did we capture enough for fully decoding the message ? */ |
| ND_TCHECK_LEN(tptr, msg_len); |
| hexdump=FALSE; |
| |
| switch(msg_type) { |
| |
| case LDP_MSG_NOTIF: |
| case LDP_MSG_HELLO: |
| case LDP_MSG_INIT: |
| case LDP_MSG_KEEPALIVE: |
| case LDP_MSG_ADDRESS: |
| case LDP_MSG_LABEL_MAPPING: |
| case LDP_MSG_ADDRESS_WITHDRAW: |
| case LDP_MSG_LABEL_WITHDRAW: |
| while(msg_tlen >= 4) { |
| processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen); |
| if (processed == 0) |
| break; |
| msg_tlen-=processed; |
| msg_tptr+=processed; |
| } |
| break; |
| |
| /* |
| * FIXME those are the defined messages that lack a decoder |
| * you are welcome to contribute code ;-) |
| */ |
| |
| case LDP_MSG_LABEL_REQUEST: |
| case LDP_MSG_LABEL_RELEASE: |
| case LDP_MSG_LABEL_ABORT_REQUEST: |
| |
| default: |
| if (ndo->ndo_vflag <= 1) |
| print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen); |
| break; |
| } |
| /* do we want to see an additionally hexdump ? */ |
| if (ndo->ndo_vflag > 1 || hexdump==TRUE) |
| print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ", |
| msg_len); |
| |
| tptr += msg_len+4; |
| tlen -= msg_len+4; |
| } |
| return pdu_len+4; |
| trunc: |
| nd_print_trunc(ndo); |
| return 0; |
| } |
