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bugfix: packet parser adds checks for packets with UDP port 2152 but not GTP-U

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This commit is contained in:
luwenpeng
2024-08-14 17:24:26 +08:00
parent 5abf0d7942
commit 42f44b53b1
4 changed files with 304 additions and 22 deletions
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27
src/packet/gtp1_utils.h
View File

@@ -203,25 +203,22 @@ static inline uint16_t calc_gtp1_hdr_len(const char *data, uint16_t len)
uint8_t next_ext_hdr = gtp_long->next_ext_hdr;
uint16_t offset = sizeof(struct gtp1_hdr_long);
if (gtp1_hdr_get_flags(gtp) & GTP1_FLAG_EXT_HDR)
while (next_ext_hdr)
{
while (next_ext_hdr)
if (offset + 1 > len)
{
if (offset + 1 > len)
{
return 0;
}
uint8_t ext_hdr_len = *((char *)data + offset) * 4 - 2;
if (offset + ext_hdr_len > len)
{
return 0;
}
offset += ext_hdr_len + 1; // skip extension header
next_ext_hdr = *((char *)data + offset);
return 0;
}
offset+=1; //next_ext_hdr==0 occupy 1 byte
uint16_t ext_hdr_len = *((char *)data + offset) * 4;
if (ext_hdr_len == 0 || offset + ext_hdr_len > len)
{
return 0;
}
offset += ext_hdr_len; // skip extension header
next_ext_hdr = *((char *)data + offset - 1);
}
return offset;
return offset;
}
else
{

8
src/packet/packet_parse.cpp
View File

@@ -831,12 +831,18 @@ static inline const char *parse_gtp_u(struct packet *pkt, const char *data, uint
return data;
}
uint8_t next_proto = (((const uint8_t *)(data + hdr_len))[0]) >> 4;
if (next_proto != 4 && next_proto != 6)
{
// next_proto is not IPv4 or IPv6, this is not a normal GTP-U packet, fallback to UDP
return data;
}
struct raw_layer *layer = get_free_layer(pkt);
if (unlikely(layer == NULL))
{
return data;
}
uint8_t next_proto = (((const uint8_t *)(data + hdr_len))[0]) >> 4;
SET_LAYER(pkt, layer, LAYER_PROTO_GTP_U, hdr_len, data, len, 0);
switch (next_proto)

87
src/packet/test/gtest_gtp1_utils.cpp
View File

@@ -186,15 +186,15 @@ TEST(GTP1_UTILS, C_SET)
* TEID: 0x001e849a (2000026)
*/
unsigned char gtp1_u[] = {
unsigned char gtp1_u1[] = {
0x30, 0xff, 0x00, 0x28, 0x00, 0x1e, 0x84, 0x9a};
TEST(GTP1_UTILS, U_GET)
TEST(GTP1_UTILS, U1_GET)
{
const struct gtp1_hdr *hdr = (struct gtp1_hdr *)gtp1_u;
const struct gtp1_hdr *hdr = (struct gtp1_hdr *)gtp1_u1;
// GTP Fixed Header Length + GTPv1-U Optional Headers + GTPv1-U Extension Headers
EXPECT_TRUE(calc_gtp1_hdr_len((const char *)gtp1_u, sizeof(gtp1_u)) == 8);
EXPECT_TRUE(calc_gtp1_hdr_len((const char *)gtp1_u1, sizeof(gtp1_u1)) == 8);
EXPECT_TRUE(gtp1_hdr_get_flags(hdr) == 0x30);
EXPECT_TRUE(gtp1_hdr_get_version(hdr) == 1);
EXPECT_TRUE(gtp1_hdr_get_proto(hdr) == 1);
@@ -214,7 +214,7 @@ TEST(GTP1_UTILS, U_GET)
printf("%s\n", buff);
}
TEST(GTP1_UTILS, U_SET)
TEST(GTP1_UTILS, U1_SET)
{
char buff[8] = {0};
@@ -233,7 +233,82 @@ TEST(GTP1_UTILS, U_SET)
gtp1_hdr_set_npdu(hdr, 0);
gtp1_hdr_set_next_ext_type(hdr, 0);
EXPECT_TRUE(memcmp(buff, gtp1_u, 8) == 0);
EXPECT_TRUE(memcmp(buff, gtp1_u1, 8) == 0);
}
/*
* User Datagram Protocol, Src Port: 2152, Dst Port: 2152
* GPRS Tunneling Protocol
* Flags: 0x34
* 001. .... = Version: GTP release 99 version (1)
* ...1 .... = Protocol type: GTP (1)
* .... 0... = Reserved: 0
* .... .1.. = Is Next Extension Header present?: Yes
* .... ..0. = Is Sequence Number present?: No
* .... ...0 = Is N-PDU number present?: No
* Message Type: T-PDU (0xff)
* Length: 445
* TEID: 0x01447453 (21263443)
* Next extension header type: PDU Session container (0x85)
* Extension header (PDU Session container)
* Extension Header Length: 1
* PDU Session Container
* 0001 .... = PDU Type: UL PDU SESSION INFORMATION (1)
* .... 0000 = Spare: 0x0
* 00.. .... = Spare: 0x0
* ..00 0001 = QoS Flow Identifier (QFI): 1
* Next extension header type: No more extension headers (0x00)
*/
unsigned char gtp1_u2[] = {
0x34, 0xff, 0x01, 0xbd, 0x01, 0x44, 0x74, 0x53, 0x00, 0x00, 0x00, 0x85, 0x01, 0x10, 0x01, 0x00};
TEST(GTP1_UTILS, U2_GET)
{
const struct gtp1_hdr *hdr = (struct gtp1_hdr *)gtp1_u2;
// GTP Fixed Header Length + GTPv1-U Optional Headers + GTPv1-U Extension Headers
EXPECT_TRUE(calc_gtp1_hdr_len((const char *)gtp1_u2, sizeof(gtp1_u2)) == 16);
EXPECT_TRUE(gtp1_hdr_get_flags(hdr) == 0x34);
EXPECT_TRUE(gtp1_hdr_get_version(hdr) == 1);
EXPECT_TRUE(gtp1_hdr_get_proto(hdr) == 1);
EXPECT_TRUE(gtp1_hdr_get_reserved(hdr) == 0);
EXPECT_TRUE(gtp1_hdr_get_ext_flag(hdr) == 1);
EXPECT_TRUE(gtp1_hdr_get_seq_flag(hdr) == 0);
EXPECT_TRUE(gtp1_hdr_get_npdu_flag(hdr) == 0);
EXPECT_TRUE(gtp1_hdr_get_msg_type(hdr) == 0xff);
EXPECT_TRUE(gtp1_hdr_get_msg_len(hdr) == 445);
EXPECT_TRUE(gtp1_hdr_get_teid(hdr) == 21263443);
EXPECT_TRUE(gtp1_hdr_get_seq(hdr) == 0);
EXPECT_TRUE(gtp1_hdr_get_npdu(hdr) == 0);
EXPECT_TRUE(gtp1_hdr_get_next_ext_type(hdr) == 0x85);
char buff[1024] = {0};
gtp1_hdr_to_str(hdr, buff, sizeof(buff));
printf("%s\n", buff);
}
TEST(GTP1_UTILS, U2_SET)
{
char buff[16] = {0};
struct gtp1_hdr *hdr = (struct gtp1_hdr *)buff;
gtp1_hdr_set_flags(hdr, 0x34);
gtp1_hdr_set_version(hdr, 1);
gtp1_hdr_set_proto(hdr, 1);
gtp1_hdr_set_reserved(hdr, 0);
gtp1_hdr_set_ext_flag(hdr, 1);
gtp1_hdr_set_seq_flag(hdr, 0);
gtp1_hdr_set_npdu_flag(hdr, 0);
gtp1_hdr_set_msg_type(hdr, 0xff);
gtp1_hdr_set_msg_len(hdr, 445);
gtp1_hdr_set_teid(hdr, 21263443);
gtp1_hdr_set_seq(hdr, 0);
gtp1_hdr_set_npdu(hdr, 0);
gtp1_hdr_set_next_ext_type(hdr, 0x85);
// not compare the extension header
EXPECT_TRUE(memcmp(buff, gtp1_u2, 12) == 0);
}
int main(int argc, char **argv)

204
src/packet/test/gtest_packet_parse.cpp
View File

@@ -2842,6 +2842,210 @@ TEST(PACKET_PARSE, ETH_IP4_TCP_PADDING)
}
#endif
/******************************************************************************
* [Protocols in frame: eth:ethertype:ipv6:udp:gtp:ip:udp:data]
******************************************************************************
*
* Frame 1: 515 bytes on wire (4120 bits), 515 bytes captured (4120 bits)
* Ethernet II, Src: 00:00:00_00:03:1c (00:00:00:00:03:1c), Dst: HuaweiTechno_f4:fc:31 (3c:9d:56:f4:fc:31)
* Destination: HuaweiTechno_f4:fc:31 (3c:9d:56:f4:fc:31)
* Source: 00:00:00_00:03:1c (00:00:00:00:03:1c)
* Type: IPv6 (0x86dd)
* Internet Protocol Version 6, Src: 2408:8161:e100:10:0:16:3:a, Dst: 2408:8141:e0f0:1f08::4
* 0110 .... = Version: 6
* .... 1011 1000 .... .... .... .... .... = Traffic Class: 0xb8 (DSCP: EF PHB, ECN: Not-ECT)
* .... 1011 10.. .... .... .... .... .... = Differentiated Services Codepoint: Expedited Forwarding (46)
* .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* .... 0100 0111 0100 0101 0011 = Flow Label: 0x47453
* Payload Length: 461
* Next Header: UDP (17)
* Hop Limit: 252
* Source Address: 2408:8161:e100:10:0:16:3:a
* Destination Address: 2408:8141:e0f0:1f08::4
* User Datagram Protocol, Src Port: 2152, Dst Port: 2152
* Source Port: 2152
* Destination Port: 2152
* Length: 461
* Checksum: 0x6312 [correct]
* [Calculated Checksum: 0x6312]
* [Checksum Status: Good]
* [Stream index: 0]
* [Timestamps]
* [Time since first frame: 0.000000000 seconds]
* [Time since previous frame: 0.000000000 seconds]
* UDP payload (453 bytes)
* GPRS Tunneling Protocol
* Flags: 0x34
* 001. .... = Version: GTP release 99 version (1)
* ...1 .... = Protocol type: GTP (1)
* .... 0... = Reserved: 0
* .... .1.. = Is Next Extension Header present?: Yes
* .... ..0. = Is Sequence Number present?: No
* .... ...0 = Is N-PDU number present?: No
* Message Type: T-PDU (0xff)
* Length: 445
* TEID: 0x01447453 (21263443)
* Next extension header type: PDU Session container (0x85)
* Extension header (PDU Session container)
* Extension Header Length: 1
* PDU Session Container
* 0001 .... = PDU Type: UL PDU SESSION INFORMATION (1)
* .... 0000 = Spare: 0x0
* 00.. .... = Spare: 0x0
* ..00 0001 = QoS Flow Identifier (QFI): 1
* Next extension header type: No more extension headers (0x00)
* Internet Protocol Version 4, Src: 10.67.71.179, Dst: 120.225.133.208
* 0100 .... = Version: 4
* .... 0101 = Header Length: 20 bytes (5)
* Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
* 0000 00.. = Differentiated Services Codepoint: Default (0)
* .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* Total Length: 437
* Identification: 0x51bf (20927)
* 000. .... = Flags: 0x0
* 0... .... = Reserved bit: Not set
* .0.. .... = Don't fragment: Not set
* ..0. .... = More fragments: Not set
* ...0 0000 0000 0000 = Fragment Offset: 0
* Time to Live: 64
* Protocol: UDP (17)
* Header Checksum: 0xd6d1 [correct]
* [Header checksum status: Good]
* [Calculated Checksum: 0xd6d1]
* Source Address: 10.67.71.179
* Destination Address: 120.225.133.208
* User Datagram Protocol, Src Port: 11102, Dst Port: 2152
* Source Port: 11102
* Destination Port: 2152
* Length: 417
* Checksum: 0x3bc2 [correct]
* [Calculated Checksum: 0x3bc2]
* [Checksum Status: Good]
* [Stream index: 1]
* [Timestamps]
* [Time since first frame: 0.000000000 seconds]
* [Time since previous frame: 0.000000000 seconds]
* UDP payload (409 bytes)
* Data (409 bytes)
* Data [truncated]: 226f2fcaba48055d4b5500030000019183000104090002810901000000110102010014100000011a3e425e9ae48c6929daebcd0e3cbd830402320bebc2000402270000000d02022800050215000a001800051c3503021612e5050217000000006d9f8ccd020218010402140000088
* [Length: 409]
*/
unsigned char data17[] = {
0x3c, 0x9d, 0x56, 0xf4, 0xfc, 0x31, 0x00, 0x00, 0x00, 0x00, 0x03, 0x1c, 0x86, 0xdd, 0x6b, 0x84, 0x74, 0x53, 0x01, 0xcd, 0x11, 0xfc, 0x24, 0x08, 0x81, 0x61,
0xe1, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x16, 0x00, 0x03, 0x00, 0x0a, 0x24, 0x08, 0x81, 0x41, 0xe0, 0xf0, 0x1f, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x04, 0x08, 0x68, 0x08, 0x68, 0x01, 0xcd, 0x63, 0x12, 0x34, 0xff, 0x01, 0xbd, 0x01, 0x44, 0x74, 0x53, 0x00, 0x00, 0x00, 0x85, 0x01, 0x10, 0x01, 0x00,
0x45, 0x00, 0x01, 0xb5, 0x51, 0xbf, 0x00, 0x00, 0x40, 0x11, 0xd6, 0xd1, 0x0a, 0x43, 0x47, 0xb3, 0x78, 0xe1, 0x85, 0xd0, 0x2b, 0x5e, 0x08, 0x68, 0x01, 0xa1,
0x3b, 0xc2, 0x22, 0x6f, 0x2f, 0xca, 0xba, 0x48, 0x05, 0x5d, 0x4b, 0x55, 0x00, 0x03, 0x00, 0x00, 0x01, 0x91, 0x83, 0x00, 0x01, 0x04, 0x09, 0x00, 0x02, 0x81,
0x09, 0x01, 0x00, 0x00, 0x00, 0x11, 0x01, 0x02, 0x01, 0x00, 0x14, 0x10, 0x00, 0x00, 0x01, 0x1a, 0x3e, 0x42, 0x5e, 0x9a, 0xe4, 0x8c, 0x69, 0x29, 0xda, 0xeb,
0xcd, 0x0e, 0x3c, 0xbd, 0x83, 0x04, 0x02, 0x32, 0x0b, 0xeb, 0xc2, 0x00, 0x04, 0x02, 0x27, 0x00, 0x00, 0x00, 0x0d, 0x02, 0x02, 0x28, 0x00, 0x05, 0x02, 0x15,
0x00, 0x0a, 0x00, 0x18, 0x00, 0x05, 0x1c, 0x35, 0x03, 0x02, 0x16, 0x12, 0xe5, 0x05, 0x02, 0x17, 0x00, 0x00, 0x00, 0x00, 0x6d, 0x9f, 0x8c, 0xcd, 0x02, 0x02,
0x18, 0x01, 0x04, 0x02, 0x14, 0x00, 0x00, 0x08, 0x80, 0x06, 0x02, 0x03, 0x00, 0x00, 0x00, 0x0c, 0x31, 0x30, 0x2e, 0x36, 0x37, 0x2e, 0x37, 0x31, 0x2e, 0x31,
0x37, 0x39, 0x03, 0x02, 0x05, 0xdc, 0x01, 0x06, 0x02, 0x06, 0x00, 0x00, 0x00, 0x0e, 0x31, 0x31, 0x32, 0x2e, 0x31, 0x31, 0x31, 0x2e, 0x35, 0x35, 0x2e, 0x32,
0x34, 0x33, 0x03, 0x02, 0x08, 0xdc, 0x01, 0x01, 0x02, 0x09, 0x00, 0x14, 0xf1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe3, 0x6b,
0x65, 0xf6, 0xf9, 0x33, 0xcc, 0xa9, 0x06, 0x02, 0x10, 0x00, 0x00, 0x00, 0x0d, 0x32, 0x31, 0x31, 0x2e, 0x39, 0x31, 0x2e, 0x31, 0x36, 0x36, 0x2e, 0x34, 0x34,
0x03, 0x02, 0x11, 0x4e, 0x21, 0x06, 0x02, 0x1b, 0x00, 0x00, 0x00, 0xb8, 0x32, 0x31, 0x37, 0x36, 0x7c, 0x31, 0x30, 0x2e, 0x36, 0x37, 0x2e, 0x37, 0x31, 0x2e,
0x31, 0x37, 0x39, 0x7c, 0x30, 0x7c, 0x35, 0x36, 0x33, 0x32, 0x31, 0x7c, 0x31, 0x31, 0x32, 0x2e, 0x31, 0x31, 0x31, 0x2e, 0x35, 0x35, 0x2e, 0x32, 0x34, 0x33,
0x7c, 0x30, 0x7c, 0x35, 0x36, 0x33, 0x32, 0x31, 0x7c, 0x32, 0x31, 0x31, 0x2e, 0x39, 0x31, 0x2e, 0x31, 0x36, 0x36, 0x2e, 0x34, 0x34, 0x7c, 0x32, 0x30, 0x30,
0x30, 0x31, 0x7c, 0x46, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x45, 0x33, 0x36, 0x42, 0x36, 0x35, 0x46, 0x36, 0x46, 0x39, 0x33, 0x33, 0x43, 0x43, 0x41, 0x39, 0x7c, 0x32, 0x34, 0x30, 0x38, 0x3a, 0x38, 0x34, 0x34,
0x62, 0x3a, 0x31, 0x38, 0x33, 0x30, 0x3a, 0x36, 0x31, 0x63, 0x62, 0x3a, 0x65, 0x63, 0x34, 0x32, 0x3a, 0x37, 0x65, 0x35, 0x32, 0x3a, 0x65, 0x65, 0x37, 0x38,
0x3a, 0x65, 0x32, 0x61, 0x38, 0x7c, 0x30, 0x7c, 0x38, 0x38, 0x38, 0x39, 0x7c, 0x32, 0x34, 0x30, 0x38, 0x3a, 0x38, 0x37, 0x33, 0x64, 0x3a, 0x31, 0x30, 0x3a,
0x34, 0x3a, 0x38, 0x30, 0x30, 0x3a, 0x3a, 0x34, 0x7c, 0x32, 0x30, 0x30, 0x30, 0x31, 0x04, 0x09, 0x02, 0x00, 0x00, 0x01, 0xf8};
#if 1
TEST(PACKET_PARSE, ETH_IP6_UDP_GTP_IP4_UDP)
{
char buffer[256];
struct packet handler;
memset(&handler, 0, sizeof(handler));
const char *payload = packet_parse(&handler, (const char *)data17, sizeof(data17));
EXPECT_TRUE(payload != nullptr);
EXPECT_TRUE((char *)payload - (char *)&data17 == 14 + 40 + 8 + 16 + 20 + 8);
packet_dump_stdio(&handler);
/******************************************************
* packet_get_outermost/innermost_layer
******************************************************/
// LAYER_PROTO_ETHER
const struct raw_layer *outer_eth_record = packet_get_outermost_raw_layer(&handler, LAYER_PROTO_ETHER);
const struct raw_layer *inner_eth_record = packet_get_innermost_raw_layer(&handler, LAYER_PROTO_ETHER);
EXPECT_TRUE(outer_eth_record != nullptr);
EXPECT_TRUE(inner_eth_record != nullptr);
EXPECT_TRUE(outer_eth_record == inner_eth_record);
EXPECT_TRUE(outer_eth_record->hdr_offset == 0);
EXPECT_TRUE(outer_eth_record->hdr_len == 14);
EXPECT_TRUE(outer_eth_record->pld_len == 501);
// LAYER_PROTO_IPV6
const struct raw_layer *outer_ipv6_record = packet_get_outermost_raw_layer(&handler, LAYER_PROTO_IPV6);
const struct raw_layer *inner_ipv6_record = packet_get_innermost_raw_layer(&handler, LAYER_PROTO_IPV6);
EXPECT_TRUE(outer_ipv6_record != nullptr);
EXPECT_TRUE(inner_ipv6_record != nullptr);
EXPECT_TRUE(outer_ipv6_record == inner_ipv6_record);
EXPECT_TRUE(outer_ipv6_record->hdr_offset == 14);
EXPECT_TRUE(outer_ipv6_record->hdr_len == 40);
EXPECT_TRUE(outer_ipv6_record->pld_len == 461);
// LAYER_PROTO_UDP
const struct raw_layer *outer_udp_record = packet_get_outermost_raw_layer(&handler, LAYER_PROTO_UDP);
EXPECT_TRUE(outer_udp_record != nullptr);
EXPECT_TRUE(outer_udp_record->hdr_offset == 54);
EXPECT_TRUE(outer_udp_record->hdr_len == 8);
EXPECT_TRUE(outer_udp_record->pld_len == 453);
// LAYER_PROTO_GTP_U
const struct raw_layer *outer_gtpu_record = packet_get_outermost_raw_layer(&handler, LAYER_PROTO_GTP_U);
const struct raw_layer *inner_gtpu_record = packet_get_innermost_raw_layer(&handler, LAYER_PROTO_GTP_U);
EXPECT_TRUE(outer_gtpu_record != nullptr);
EXPECT_TRUE(inner_gtpu_record != nullptr);
EXPECT_TRUE(outer_gtpu_record == inner_gtpu_record);
EXPECT_TRUE(outer_gtpu_record->hdr_offset == 62);
EXPECT_TRUE(outer_gtpu_record->hdr_len == 16);
EXPECT_TRUE(outer_gtpu_record->pld_len == 437);
// LAYER_PROTO_IPV4
const struct raw_layer *inner_ipv4_record = packet_get_innermost_raw_layer(&handler, LAYER_PROTO_IPV4);
const struct raw_layer *outer_ipv4_record = packet_get_outermost_raw_layer(&handler, LAYER_PROTO_IPV4);
EXPECT_TRUE(inner_ipv4_record != nullptr);
EXPECT_TRUE(outer_ipv4_record != nullptr);
EXPECT_TRUE(inner_ipv4_record == outer_ipv4_record);
EXPECT_TRUE(inner_ipv4_record->hdr_offset == 78);
EXPECT_TRUE(inner_ipv4_record->hdr_len == 20);
EXPECT_TRUE(inner_ipv4_record->pld_len == 417);
// LAYER_PROTO_UDP
const struct raw_layer *inner_udp_record = packet_get_innermost_raw_layer(&handler, LAYER_PROTO_UDP);
EXPECT_TRUE(inner_udp_record != nullptr);
EXPECT_TRUE(inner_udp_record->hdr_offset == 98);
EXPECT_TRUE(inner_udp_record->hdr_len == 8);
EXPECT_TRUE(inner_udp_record->pld_len == 409);
/******************************************************
* packet_get_outermost/innermost_tuple4
******************************************************/
struct tuple4 outer_tuple4;
struct tuple4 inner_tuple4;
EXPECT_TRUE(packet_get_outermost_tuple4(&handler, &outer_tuple4) == 0);
EXPECT_TRUE(packet_get_innermost_tuple4(&handler, &inner_tuple4) == 0);
memset(buffer, 0, sizeof(buffer));
tuple4_to_str(&outer_tuple4, buffer, sizeof(buffer));
EXPECT_STREQ(buffer, "2408:8161:e100:10:0:16:3:a:2152-2408:8141:e0f0:1f08::4:2152");
memset(buffer, 0, sizeof(buffer));
tuple4_to_str(&inner_tuple4, buffer, sizeof(buffer));
EXPECT_STREQ(buffer, "10.67.71.179:11102-120.225.133.208:2152");
}
#endif
int main(int argc, char **argv)
{
::testing::InitGoogleTest(&argc, argv);