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237 lines
7.3 KiB
C
237 lines
7.3 KiB
C
/* Copyright (C) 2007-2020 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \ingroup decode
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*
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* @{
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Decode UDP
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*/
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#include "suricata-common.h"
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#include "decode.h"
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#include "decode-geneve.h"
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#include "decode-udp.h"
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#include "decode-teredo.h"
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#include "decode-vxlan.h"
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#include "decode-events.h"
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#include "util-unittest.h"
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#include "util-debug.h"
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#include "flow.h"
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#include "app-layer.h"
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static int DecodeUDPPacket(ThreadVars *t, Packet *p, const uint8_t *pkt, uint16_t len)
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{
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if (unlikely(len < UDP_HEADER_LEN)) {
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ENGINE_SET_INVALID_EVENT(p, UDP_HLEN_TOO_SMALL);
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return -1;
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}
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const UDPHdr *udph = PacketSetUDP(p, pkt);
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if (unlikely(len < UDP_GET_RAW_LEN(udph))) {
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ENGINE_SET_INVALID_EVENT(p, UDP_PKT_TOO_SMALL);
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return -1;
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}
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if (unlikely(UDP_GET_RAW_LEN(udph) < UDP_HEADER_LEN)) {
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ENGINE_SET_INVALID_EVENT(p, UDP_LEN_INVALID);
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return -1;
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}
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p->sp = UDP_GET_RAW_SRC_PORT(udph);
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p->dp = UDP_GET_RAW_DST_PORT(udph);
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p->payload = (uint8_t *)pkt + UDP_HEADER_LEN;
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p->payload_len = UDP_GET_RAW_LEN(udph) - UDP_HEADER_LEN;
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p->proto = IPPROTO_UDP;
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return 0;
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}
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int DecodeUDP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
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const uint8_t *pkt, uint16_t len)
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{
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StatsIncr(tv, dtv->counter_udp);
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if (unlikely(DecodeUDPPacket(tv, p, pkt,len) < 0)) {
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PacketClearL4(p);
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return TM_ECODE_FAILED;
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}
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SCLogDebug("UDP sp: %u -> dp: %u - HLEN: %" PRIu32 " LEN: %" PRIu32 "", p->sp, p->dp,
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UDP_HEADER_LEN, p->payload_len);
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if (DecodeTeredoEnabledForPort(p->sp, p->dp) &&
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likely(DecodeTeredo(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
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/* Here we have a Teredo packet and don't need to handle app
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* layer */
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FlowSetupPacket(p);
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return TM_ECODE_OK;
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}
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/* Handle Geneve if configured */
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if (DecodeGeneveEnabledForPort(p->sp, p->dp) &&
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unlikely(DecodeGeneve(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
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/* Here we have a Geneve packet and don't need to handle app
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* layer */
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FlowSetupPacket(p);
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return TM_ECODE_OK;
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}
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/* Handle VXLAN if configured */
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if (DecodeVXLANEnabledForPort(p->sp, p->dp) &&
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unlikely(DecodeVXLAN(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
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/* Here we have a VXLAN packet and don't need to handle app
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* layer */
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FlowSetupPacket(p);
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return TM_ECODE_OK;
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}
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FlowSetupPacket(p);
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return TM_ECODE_OK;
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}
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#ifdef UNITTESTS
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static int UDPV4CalculateValidChecksumtest01(void)
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{
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uint16_t csum = 0;
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uint8_t raw_ipshdr[] = {
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0xd0, 0x43, 0xdc, 0xdc, 0xc0, 0xa8, 0x01, 0x3};
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uint8_t raw_udp[] = {
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0x00, 0x35, 0xcf, 0x34, 0x00, 0x55, 0x6c, 0xe0,
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0x83, 0xfc, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01,
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0x00, 0x00, 0x00, 0x00, 0x07, 0x70, 0x61, 0x67,
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0x65, 0x61, 0x64, 0x32, 0x11, 0x67, 0x6f, 0x6f,
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0x67, 0x6c, 0x65, 0x73, 0x79, 0x6e, 0x64, 0x69,
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0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x03, 0x63,
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0x6f, 0x6d, 0x00, 0x00, 0x1c, 0x00, 0x01, 0xc0,
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0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01, 0x4b,
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0x50, 0x00, 0x12, 0x06, 0x70, 0x61, 0x67, 0x65,
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0x61, 0x64, 0x01, 0x6c, 0x06, 0x67, 0x6f, 0x6f,
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0x67, 0x6c, 0x65, 0xc0, 0x26};
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csum = *( ((uint16_t *)raw_udp) + 3);
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FAIL_IF(UDPV4Checksum((uint16_t *) raw_ipshdr,
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(uint16_t *)raw_udp, sizeof(raw_udp), csum) != 0);
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PASS;
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}
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static int UDPV4CalculateInvalidChecksumtest02(void)
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{
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uint16_t csum = 0;
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uint8_t raw_ipshdr[] = {
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0xd0, 0x43, 0xdc, 0xdc, 0xc0, 0xa8, 0x01, 0x3};
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uint8_t raw_udp[] = {
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0x00, 0x35, 0xcf, 0x34, 0x00, 0x55, 0x6c, 0xe0,
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0x83, 0xfc, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01,
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0x00, 0x00, 0x00, 0x00, 0x07, 0x70, 0x61, 0x67,
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0x65, 0x61, 0x64, 0x32, 0x11, 0x67, 0x6f, 0x6f,
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0x67, 0x6c, 0x65, 0x73, 0x79, 0x6e, 0x64, 0x69,
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0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x03, 0x63,
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0x6f, 0x6d, 0x00, 0x00, 0x1c, 0x00, 0x01, 0xc0,
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0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01, 0x4b,
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0x50, 0x00, 0x12, 0x06, 0x70, 0x61, 0x67, 0x65,
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0x61, 0x64, 0x01, 0x6c, 0x06, 0x67, 0x6f, 0x6f,
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0x67, 0x6c, 0x65, 0xc0, 0x27};
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csum = *( ((uint16_t *)raw_udp) + 3);
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FAIL_IF(UDPV4Checksum((uint16_t *) raw_ipshdr,
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(uint16_t *)raw_udp, sizeof(raw_udp), csum) == 0);
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PASS;
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}
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static int UDPV6CalculateValidChecksumtest03(void)
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{
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uint16_t csum = 0;
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static uint8_t raw_ipv6[] = {
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0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x00, 0x00,
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0x86, 0x05, 0x80, 0xda, 0x86, 0xdd, 0x60, 0x00,
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0x00, 0x00, 0x00, 0x14, 0x11, 0x02, 0x3f, 0xfe,
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0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00,
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0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe,
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0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0,
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0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75,
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0x82, 0xa0, 0x00, 0x14, 0x1a, 0xc3, 0x06, 0x02,
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0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0x57, 0xb0,
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0x09, 0x00};
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csum = *( ((uint16_t *)(raw_ipv6 + 60)));
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FAIL_IF(UDPV6Checksum((uint16_t *)(raw_ipv6 + 14 + 8),
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(uint16_t *)(raw_ipv6 + 54), 20, csum) != 0);
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PASS;
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}
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static int UDPV6CalculateInvalidChecksumtest04(void)
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{
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uint16_t csum = 0;
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static uint8_t raw_ipv6[] = {
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0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x00, 0x00,
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0x86, 0x05, 0x80, 0xda, 0x86, 0xdd, 0x60, 0x00,
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0x00, 0x00, 0x00, 0x14, 0x11, 0x02, 0x3f, 0xfe,
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0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00,
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0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe,
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0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0,
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0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75,
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0x82, 0xa0, 0x00, 0x14, 0x1a, 0xc3, 0x06, 0x02,
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0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0x57, 0xb0,
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0x09, 0x01};
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csum = *( ((uint16_t *)(raw_ipv6 + 60)));
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FAIL_IF(UDPV6Checksum((uint16_t *)(raw_ipv6 + 14 + 8),
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(uint16_t *)(raw_ipv6 + 54), 20, csum) == 0);
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PASS;
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}
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#endif /* UNITTESTS */
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void DecodeUDPV4RegisterTests(void)
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{
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#ifdef UNITTESTS
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UtRegisterTest("UDPV4CalculateValidChecksumtest01",
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UDPV4CalculateValidChecksumtest01);
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UtRegisterTest("UDPV4CalculateInvalidChecksumtest02",
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UDPV4CalculateInvalidChecksumtest02);
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UtRegisterTest("UDPV6CalculateValidChecksumtest03",
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UDPV6CalculateValidChecksumtest03);
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UtRegisterTest("UDPV6CalculateInvalidChecksumtest04",
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UDPV6CalculateInvalidChecksumtest04);
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#endif /* UNITTESTS */
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}
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/**
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* @}
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*/
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