* Parse the extended communities path attribute (8 byte as per RFC4360) * * \details * Will parse the EXTENDED COMMUNITIES data passed. Parsed data will be stored * in parsed_data. * * \param [in] attr_len Length of the attribute data * \param [in] data Pointer to the attribute data * \param [out] parsed_data Reference to pars
| 49 | * |
| 50 | */ |
| 51 | void ExtCommunity::parseExtCommunities(int attr_len, u_char *data, bgp_msg::UpdateMsg::parsed_update_data &parsed_data) { |
| 52 | |
| 53 | std::string decodeStr = ""; |
| 54 | extcomm_hdr ec_hdr; |
| 55 | |
| 56 | if ( (attr_len % 8) ) { |
| 57 | LOG_NOTICE("%s: Parsing extended community len=%d is invalid, expecting divisible by 8", peer_addr.c_str(), attr_len); |
| 58 | return; |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Loop through consecutive entries |
| 63 | */ |
| 64 | for (int i = 0; i < attr_len; i += 8) { |
| 65 | // Setup extended community header |
| 66 | ec_hdr.high_type = data[0]; |
| 67 | ec_hdr.low_type = data[1]; |
| 68 | ec_hdr.value = data + 2; |
| 69 | |
| 70 | /* |
| 71 | * Docode the community by type |
| 72 | */ |
| 73 | switch (ec_hdr.high_type << 2 >> 2) { |
| 74 | case EXT_TYPE_IPV4 : |
| 75 | decodeStr.append(decodeType_common(ec_hdr, true, true)); |
| 76 | break; |
| 77 | |
| 78 | case EXT_TYPE_2OCTET_AS : |
| 79 | decodeStr.append(decodeType_common(ec_hdr)); |
| 80 | break; |
| 81 | |
| 82 | case EXT_TYPE_4OCTET_AS : |
| 83 | decodeStr.append(decodeType_common(ec_hdr, true)); |
| 84 | break; |
| 85 | |
| 86 | case EXT_TYPE_GENERIC : |
| 87 | decodeStr.append(decodeType_Generic(ec_hdr)); |
| 88 | break; |
| 89 | |
| 90 | case EXT_TYPE_GENERIC_4OCTET_AS : |
| 91 | decodeStr.append(decodeType_Generic(ec_hdr, true)); |
| 92 | break; |
| 93 | |
| 94 | case EXT_TYPE_GENERIC_IPV4 : |
| 95 | decodeStr.append(decodeType_Generic(ec_hdr, true, true)); |
| 96 | break; |
| 97 | |
| 98 | case EXT_TYPE_OPAQUE : |
| 99 | decodeStr.append(decodeType_Opaque(ec_hdr)); |
| 100 | break; |
| 101 | |
| 102 | case EXT_TYPE_EVPN : |
| 103 | decodeStr.append(decodeType_EVPN(ec_hdr)); |
| 104 | break; |
| 105 | |
| 106 | case EXT_TYPE_QOS_MARK : // TODO: Implement |
| 107 | case EXT_TYPE_FLOW_SPEC : // TODO: Implement |
| 108 | case EXT_TYPE_COS_CAP : // TODO: Implement |