/* Ido Barnea Cisco Systems, Inc. */ /* Copyright (c) 2016-2016 Cisco Systems, Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ #include #include #include #include #include #include #include void CFlowStatParser::reset() { m_ipv4 = 0; m_l4_proto = 0; m_stat_supported = false; } int CFlowStatParser::parse(uint8_t *p, uint16_t len) { EthernetHeader *ether = (EthernetHeader *)p; int min_len = ETH_HDR_LEN + IPV4_HDR_LEN; reset(); if (len < min_len) return -1; switch( ether->getNextProtocol() ) { case EthernetHeader::Protocol::IP : m_ipv4 = (IPHeader *)(p + ETH_HDR_LEN); m_stat_supported = true; break; case EthernetHeader::Protocol::VLAN : min_len += 4; if (len < min_len) return -1; switch ( ether->getVlanProtocol() ){ case EthernetHeader::Protocol::IP: m_ipv4 = (IPHeader *)(p + 18); m_stat_supported = true; break; default: m_stat_supported = false; return -1; } break; default: m_stat_supported = false; return -1; break; } return 0; } int CFlowStatParser::get_ip_id(uint16_t &ip_id) { if (! m_ipv4) return -1; ip_id = m_ipv4->getId(); return 0; } int CFlowStatParser::set_ip_id(uint16_t new_id) { if (! m_ipv4) return -1; // Updating checksum, not recalculating, so if someone put bad checksum on purpose, it will stay bad m_ipv4->updateCheckSum(PKT_NTOHS(m_ipv4->getId()), PKT_NTOHS(new_id)); m_ipv4->setId(new_id); return 0; } int CFlowStatParser::get_l4_proto(uint8_t &proto) { if (! m_ipv4) return -1; proto = m_ipv4->getProtocol(); return 0; } // calculate the payload len. Do not want to do this in parse(), since this is required only in // specific cases, while parse is used in many places (including on packet RX path, where we want to bo as fast as possible) int CFlowStatParser::get_payload_len(uint8_t *p, uint16_t len, uint16_t &payload_len) { uint16_t l2_header_len; uint16_t l3_header_len; uint16_t l4_header_len; uint8_t *p_l4 = NULL; TCPHeader *p_tcp = NULL; if (!m_ipv4) { payload_len = 0; return -1; } l2_header_len = ((uint8_t *)m_ipv4) - p; l3_header_len = m_ipv4->getHeaderLength(); switch (m_ipv4->getProtocol()) { case IPPROTO_UDP: l4_header_len = 8; break; case IPPROTO_TCP: p_l4 = ((uint8_t *)m_ipv4) + l3_header_len; if ((p_l4 + TCP_HEADER_LEN) > (p + len)) { //Not enough space for TCP header payload_len = 0; return -1; } p_tcp = (TCPHeader *)p_l4; l4_header_len = p_tcp->getHeaderLength(); break; case IPPROTO_ICMP: l4_header_len = 8; break; default: l4_header_len = 0; } if (len < l2_header_len + l3_header_len + l4_header_len) { payload_len = 0; return -1; } payload_len = len - l2_header_len - l3_header_len - l4_header_len; return 0; } static const uint16_t TEST_IP_ID = 0xabcd; static const uint8_t TEST_L4_PROTO = IPPROTO_UDP; int CFlowStatParser::test() { uint16_t ip_id = 0; uint8_t l4_proto; uint8_t test_pkt[] = { // ether header 0x74, 0xa2, 0xe6, 0xd5, 0x39, 0x25, 0xa0, 0x36, 0x9f, 0x38, 0xa4, 0x02, 0x81, 0x00, 0x0a, 0xbc, 0x08, 0x00, // vlan // IP header 0x45,0x02,0x00,0x30, 0x01,0x02,0x40,0x00, 0xff, TEST_L4_PROTO, 0xbd,0x04, 0x10,0x0,0x0,0x1, 0x30,0x0,0x0,0x1, // TCP heaader 0xab, 0xcd, 0x00, 0x80, // src, dst ports 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, // seq num, ack num 0x50, 0x00, 0xff, 0xff, // Header size, flags, window size 0x00, 0x00, 0x00, 0x00, // checksum ,urgent pointer // some extra bytes 0x1, 0x2, 0x3, 0x4 }; // good packet assert (parse(test_pkt, sizeof(test_pkt)) == 0); m_ipv4->updateCheckSum(); assert(m_ipv4->isChecksumOK() == true); set_ip_id(TEST_IP_ID); // utl_DumpBuffer(stdout, test_pkt, sizeof(test_pkt), 0); get_ip_id(ip_id); assert(ip_id == TEST_IP_ID); assert(m_ipv4->isChecksumOK() == true); assert(get_l4_proto(l4_proto) == 0); assert(l4_proto == TEST_L4_PROTO); assert(m_stat_supported == true); // payload len test uint16_t payload_len; int ret; ret = get_payload_len(test_pkt, sizeof(test_pkt), payload_len); // UDP packet. assert(ret == 0); assert(payload_len == 16); reset(); // ICMP packet test_pkt[27] = IPPROTO_ICMP; assert (parse(test_pkt, sizeof(test_pkt)) == 0); ret = get_payload_len(test_pkt, sizeof(test_pkt), payload_len); assert(ret == 0); assert(payload_len == 16); // TCP packet test_pkt[27] = IPPROTO_TCP; assert (parse(test_pkt, sizeof(test_pkt)) == 0); ret = get_payload_len(test_pkt, sizeof(test_pkt), payload_len); assert(ret == 0); assert(payload_len == 4); // Other protocol test_pkt[27] = 0xaa; assert (parse(test_pkt, sizeof(test_pkt)) == 0); ret = get_payload_len(test_pkt, sizeof(test_pkt), payload_len); assert(ret == 0); assert(payload_len == 24); reset(); // bad packet. change eth protocol test_pkt[16] = 0xaa; assert (parse(test_pkt, sizeof(test_pkt)) == -1); assert(m_stat_supported == false); return 0; } // In 82599 10G card we do not support VLANs int C82599Parser::parse(uint8_t *p, uint16_t len) { EthernetHeader *ether = (EthernetHeader *)p; int min_len = ETH_HDR_LEN + IPV4_HDR_LEN; reset(); if (len < min_len) return -1; switch( ether->getNextProtocol() ) { case EthernetHeader::Protocol::IP : m_ipv4 = (IPHeader *)(p + ETH_HDR_LEN); m_stat_supported = true; break; default: m_stat_supported = false; return -1; break; } return 0; }