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-rw-r--r--src/decode-udp.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/src/decode-udp.c b/src/decode-udp.c
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+++ b/src/decode-udp.c
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+/* Copyright (C) 2007-2020 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \ingroup decode
+ *
+ * @{
+ */
+
+
+/**
+ * \file
+ *
+ * \author Victor Julien <victor@inliniac.net>
+ *
+ * Decode UDP
+ */
+
+#include "suricata-common.h"
+#include "decode.h"
+#include "decode-geneve.h"
+#include "decode-udp.h"
+#include "decode-teredo.h"
+#include "decode-vxlan.h"
+#include "decode-events.h"
+#include "util-unittest.h"
+#include "util-debug.h"
+#include "flow.h"
+#include "app-layer.h"
+
+static int DecodeUDPPacket(ThreadVars *t, Packet *p, const uint8_t *pkt, uint16_t len)
+{
+ if (unlikely(len < UDP_HEADER_LEN)) {
+ ENGINE_SET_INVALID_EVENT(p, UDP_HLEN_TOO_SMALL);
+ return -1;
+ }
+
+ p->udph = (UDPHdr *)pkt;
+
+ if (unlikely(len < UDP_GET_LEN(p))) {
+ ENGINE_SET_INVALID_EVENT(p, UDP_PKT_TOO_SMALL);
+ return -1;
+ }
+
+ if (unlikely(UDP_GET_LEN(p) < UDP_HEADER_LEN)) {
+ ENGINE_SET_INVALID_EVENT(p, UDP_LEN_INVALID);
+ return -1;
+ }
+
+ SET_UDP_SRC_PORT(p,&p->sp);
+ SET_UDP_DST_PORT(p,&p->dp);
+
+ p->payload = (uint8_t *)pkt + UDP_HEADER_LEN;
+ p->payload_len = UDP_GET_LEN(p) - UDP_HEADER_LEN;
+
+ p->proto = IPPROTO_UDP;
+
+ return 0;
+}
+
+int DecodeUDP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
+ const uint8_t *pkt, uint16_t len)
+{
+ StatsIncr(tv, dtv->counter_udp);
+
+ if (unlikely(DecodeUDPPacket(tv, p, pkt,len) < 0)) {
+ CLEAR_UDP_PACKET(p);
+ return TM_ECODE_FAILED;
+ }
+
+ SCLogDebug("UDP sp: %" PRIu32 " -> dp: %" PRIu32 " - HLEN: %" PRIu32 " LEN: %" PRIu32 "",
+ UDP_GET_SRC_PORT(p), UDP_GET_DST_PORT(p), UDP_HEADER_LEN, p->payload_len);
+
+ if (DecodeTeredoEnabledForPort(p->sp, p->dp) &&
+ likely(DecodeTeredo(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
+ /* Here we have a Teredo packet and don't need to handle app
+ * layer */
+ FlowSetupPacket(p);
+ return TM_ECODE_OK;
+ }
+
+ /* Handle Geneve if configured */
+ if (DecodeGeneveEnabledForPort(p->sp, p->dp) &&
+ unlikely(DecodeGeneve(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
+ /* Here we have a Geneve packet and don't need to handle app
+ * layer */
+ FlowSetupPacket(p);
+ return TM_ECODE_OK;
+ }
+
+ /* Handle VXLAN if configured */
+ if (DecodeVXLANEnabledForPort(p->sp, p->dp) &&
+ unlikely(DecodeVXLAN(tv, dtv, p, p->payload, p->payload_len) == TM_ECODE_OK)) {
+ /* Here we have a VXLAN packet and don't need to handle app
+ * layer */
+ FlowSetupPacket(p);
+ return TM_ECODE_OK;
+ }
+
+ FlowSetupPacket(p);
+
+ return TM_ECODE_OK;
+}
+
+#ifdef UNITTESTS
+static int UDPV4CalculateValidChecksumtest01(void)
+{
+ uint16_t csum = 0;
+
+ uint8_t raw_ipshdr[] = {
+ 0xd0, 0x43, 0xdc, 0xdc, 0xc0, 0xa8, 0x01, 0x3};
+
+ uint8_t raw_udp[] = {
+ 0x00, 0x35, 0xcf, 0x34, 0x00, 0x55, 0x6c, 0xe0,
+ 0x83, 0xfc, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x07, 0x70, 0x61, 0x67,
+ 0x65, 0x61, 0x64, 0x32, 0x11, 0x67, 0x6f, 0x6f,
+ 0x67, 0x6c, 0x65, 0x73, 0x79, 0x6e, 0x64, 0x69,
+ 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x03, 0x63,
+ 0x6f, 0x6d, 0x00, 0x00, 0x1c, 0x00, 0x01, 0xc0,
+ 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01, 0x4b,
+ 0x50, 0x00, 0x12, 0x06, 0x70, 0x61, 0x67, 0x65,
+ 0x61, 0x64, 0x01, 0x6c, 0x06, 0x67, 0x6f, 0x6f,
+ 0x67, 0x6c, 0x65, 0xc0, 0x26};
+
+ csum = *( ((uint16_t *)raw_udp) + 3);
+
+ FAIL_IF(UDPV4Checksum((uint16_t *) raw_ipshdr,
+ (uint16_t *)raw_udp, sizeof(raw_udp), csum) != 0);
+ PASS;
+}
+
+static int UDPV4CalculateInvalidChecksumtest02(void)
+{
+ uint16_t csum = 0;
+
+ uint8_t raw_ipshdr[] = {
+ 0xd0, 0x43, 0xdc, 0xdc, 0xc0, 0xa8, 0x01, 0x3};
+
+ uint8_t raw_udp[] = {
+ 0x00, 0x35, 0xcf, 0x34, 0x00, 0x55, 0x6c, 0xe0,
+ 0x83, 0xfc, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x07, 0x70, 0x61, 0x67,
+ 0x65, 0x61, 0x64, 0x32, 0x11, 0x67, 0x6f, 0x6f,
+ 0x67, 0x6c, 0x65, 0x73, 0x79, 0x6e, 0x64, 0x69,
+ 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x03, 0x63,
+ 0x6f, 0x6d, 0x00, 0x00, 0x1c, 0x00, 0x01, 0xc0,
+ 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01, 0x4b,
+ 0x50, 0x00, 0x12, 0x06, 0x70, 0x61, 0x67, 0x65,
+ 0x61, 0x64, 0x01, 0x6c, 0x06, 0x67, 0x6f, 0x6f,
+ 0x67, 0x6c, 0x65, 0xc0, 0x27};
+
+ csum = *( ((uint16_t *)raw_udp) + 3);
+
+ FAIL_IF(UDPV4Checksum((uint16_t *) raw_ipshdr,
+ (uint16_t *)raw_udp, sizeof(raw_udp), csum) == 0);
+ PASS;
+}
+
+static int UDPV6CalculateValidChecksumtest03(void)
+{
+ uint16_t csum = 0;
+
+ static uint8_t raw_ipv6[] = {
+ 0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x00, 0x00,
+ 0x86, 0x05, 0x80, 0xda, 0x86, 0xdd, 0x60, 0x00,
+ 0x00, 0x00, 0x00, 0x14, 0x11, 0x02, 0x3f, 0xfe,
+ 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00,
+ 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe,
+ 0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0,
+ 0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75,
+ 0x82, 0xa0, 0x00, 0x14, 0x1a, 0xc3, 0x06, 0x02,
+ 0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0x57, 0xb0,
+ 0x09, 0x00};
+
+ csum = *( ((uint16_t *)(raw_ipv6 + 60)));
+
+ FAIL_IF(UDPV6Checksum((uint16_t *)(raw_ipv6 + 14 + 8),
+ (uint16_t *)(raw_ipv6 + 54), 20, csum) != 0);
+ PASS;
+}
+
+static int UDPV6CalculateInvalidChecksumtest04(void)
+{
+ uint16_t csum = 0;
+
+ static uint8_t raw_ipv6[] = {
+ 0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x00, 0x00,
+ 0x86, 0x05, 0x80, 0xda, 0x86, 0xdd, 0x60, 0x00,
+ 0x00, 0x00, 0x00, 0x14, 0x11, 0x02, 0x3f, 0xfe,
+ 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00,
+ 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe,
+ 0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0,
+ 0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75,
+ 0x82, 0xa0, 0x00, 0x14, 0x1a, 0xc3, 0x06, 0x02,
+ 0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0x57, 0xb0,
+ 0x09, 0x01};
+
+ csum = *( ((uint16_t *)(raw_ipv6 + 60)));
+
+ FAIL_IF(UDPV6Checksum((uint16_t *)(raw_ipv6 + 14 + 8),
+ (uint16_t *)(raw_ipv6 + 54), 20, csum) == 0);
+ PASS;
+}
+#endif /* UNITTESTS */
+
+void DecodeUDPV4RegisterTests(void)
+{
+#ifdef UNITTESTS
+ UtRegisterTest("UDPV4CalculateValidChecksumtest01",
+ UDPV4CalculateValidChecksumtest01);
+ UtRegisterTest("UDPV4CalculateInvalidChecksumtest02",
+ UDPV4CalculateInvalidChecksumtest02);
+ UtRegisterTest("UDPV6CalculateValidChecksumtest03",
+ UDPV6CalculateValidChecksumtest03);
+ UtRegisterTest("UDPV6CalculateInvalidChecksumtest04",
+ UDPV6CalculateInvalidChecksumtest04);
+#endif /* UNITTESTS */
+}
+/**
+ * @}
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-23 09:56:01 +0000