move openbsc/* to repos root

This is the first step in creating this repository from the legacy openbsc.git.

Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.

Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7

1 files changed, 272 insertions, 0 deletions

diff --git a/tests/slhc/slhc_test.c b/tests/slhc/slhc_test.c
new file mode 100644
index 000000000..d2e1cd9dc
--- /dev/null
+++ b/tests/slhc/slhc_test.c
@@ -0,0 +1,272 @@
+/* Test SLHC/RFC1144 TCP/IP Header compression/decompression */
+
+/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <openbsc/slhc.h>
+#include <openbsc/debug.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/utils.h>
+
+#include <osmocom/core/application.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+/* Number of compression slots (S0-1) */
+#define SLOTS 8
+
+/* Maximum packet bytes to display */
+#define DISP_MAX_BYTES 100
+
+/* Sample packets to test with */
+#define PACKETS_LEN 15
+char *packets[] = {
+	/* With TCP Option 10 (Timestamps) in place (forces UNCOMPRESSED_TCP) */
+	"4510004046dd40004006a9a7c0a8646ec0a864640017ad8b81980100f3ac984d801800e32a1600000101080a000647de06d1bf5efffd18fffd20fffd23fffd27",
+	"4510005b46de40004006a98bc0a8646ec0a864640017ad8b8198010cf3ac984d801800e3867500000101080a000647df06d1bf61fffb03fffd1ffffd21fffe22fffb05fffa2001fff0fffa2301fff0fffa2701fff0fffa1801fff0",
+	"4510003746df40004006a9aec0a8646ec0a864640017ad8b81980133f3ac989f801800e35fd700000101080a000647e106d1bf63fffd01",
+	"4510003746e040004006a9adc0a8646ec0a864640017ad8b81980136f3ac98a2801800e35fd200000101080a000647e106d1bf64fffb01",
+	"4510007446e140004006a96fc0a8646ec0a864640017ad8b81980139f3ac98a5801800e37b9b00000101080a000647e206d1bf640d0a2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d0d0a57656c6c636f6d6520746f20706f6c6c75780d0a2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d0d0a0d0a",
+	"4510004246e240004006a9a0c0a8646ec0a864640017ad8b81980179f3ac98a5801800e3dab000000101080a000647ec06d1bf6f706f6c6c7578206c6f67696e3a20",
+	/* Regular TCP packets (COMPRESSED_TCP) */
+	"4510003446dd40004006a9b3c0a8646ec0a864640017ad8b81980100f3ac984d501800e371410000fffd18fffd20fffd23fffd27",
+	"4510004f46de40004006a997c0a8646ec0a864640017ad8b8198010cf3ac984d501800e3cda40000fffb03fffd1ffffd21fffe22fffb05fffa2001fff0fffa2301fff0fffa2701fff0fffa1801fff0",
+	"4510002b46df40004006a9bac0a8646ec0a864640017ad8b81980133f3ac989f501800e3a70a0000fffd01",
+	"4510002b46e040004006a9b9c0a8646ec0a864640017ad8b81980136f3ac98a2501800e3a7060000fffb01",
+	"4510006846e140004006a97bc0a8646ec0a864640017ad8b81980139f3ac98a5501800e3c2d000000d0a2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d0d0a57656c6c636f6d6520746f20706f6c6c75780d0a2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d2d0d0a0d0a",
+	"4510003646e240004006a9acc0a8646ec0a864640017ad8b81980179f3ac98a5501800e321fb0000706f6c6c7578206c6f67696e3a20",
+	/* UDP packets (TYPE_IP */
+	"450000396e0b40004011a0310a0901650a09170105da003500255489a60f01000001000000000000076f736d6f636f6d036f72670000010001",
+	"450000dc9eeb00004011aeae0a0917010a090165003505da00c83fbaa60f81800001000100030004076f736d6f636f6d036f72670000010001c00c00010001000079be0004904c2b4cc00c000200010000173d00130773756e6265616d08676e756d6f6e6b73c014c00c000200010000173d000603646e73c041c00c000200010000173d000a0767616e65736861c041c058000100010000173d0004d55f2e45c058001c00010000173d0010200107800045f0460000000000690001c06a0001000100006a710004d55f1b78c039000100010000173d000453ecb2cb",
+	"45000037652340004011a91b0a0901650a091701ef1b0035002376a2c3910100000100000000000006676f6f676c650264650000010001",
+	"0050b6162c10000db93a3ff908004500004726a6000038114083080808080a0901650035ef1b00338a8cc3918180000100010000000006676f6f676c650264650000010001c00c000100010000012b0004d83ad503",
+};
+
+/* Compress a packet using Van Jacobson RFC1144 header compression */
+static int compress(uint8_t *data_o, uint8_t *data_i, int len,
+		    struct slcompress *comp)
+{
+	uint8_t *comp_ptr;	/* Not used */
+	int compr_len;
+
+	/* Create a working copy of the incoming data */
+	memcpy(data_o, data_i, len);
+
+	/* Run compressor */
+	compr_len = slhc_compress(comp, data_i, len, data_o, &comp_ptr, 0);
+	return compr_len;
+}
+
+/* Expand a packet using Van Jacobson RFC1144 header compression */
+static int expand(uint8_t *data_o, uint8_t *data_i, int len,
+		  struct slcompress *comp)
+{
+	int data_decompressed_len;
+
+	/* Create a working copy of the incoming data */
+	memcpy(data_o, data_i, len);
+
+	/* Handle an uncompressed packet (learn header information */
+	if ((data_i[0] & SL_TYPE_UNCOMPRESSED_TCP) == SL_TYPE_UNCOMPRESSED_TCP) {
+		data_o[0] &= 0x4F;
+		data_decompressed_len = slhc_remember(comp, data_o, len);
+		return data_decompressed_len;
+	}
+
+	/* Uncompress compressed packets */
+	else if (data_o[0] & SL_TYPE_COMPRESSED_TCP) {
+		data_decompressed_len = slhc_uncompress(comp, data_o, len);
+		return data_decompressed_len;
+	}
+
+	/* Regular or unknown packets will not be touched */
+	return len;
+}
+
+/* Calculate IP Header checksum */
+static uint16_t calc_ip_csum(uint8_t *data, int len)
+{
+	int i;
+	uint32_t accumulator = 0;
+	uint16_t *pointer = (uint16_t *) data;
+
+	for (i = len; i > 1; i -= 2) {
+		accumulator += *pointer;
+		pointer++;
+	}
+
+	if (len % 2)
+		accumulator += *pointer;
+
+	accumulator = (accumulator & 0xffff) + ((accumulator >> 16) & 0xffff);
+	accumulator += (accumulator >> 16) & 0xffff;
+	return (~accumulator);
+}
+
+/* Calculate TCP/IP checksum */
+static uint16_t calc_tcpip_csum(const void *ctx, uint8_t *packet, int len)
+{
+	uint8_t *buf;
+	uint16_t csum;
+
+	buf = talloc_zero_size(ctx, len);
+	memset(buf, 0, len);
+	memcpy(buf, packet + 12, 8);
+	buf[9] = packet[9];
+	buf[11] = (len - 20) & 0xFF;
+	buf[10] = (len - 20) >> 8 & 0xFF;
+	memcpy(buf + 12, packet + 20, len - 20);
+	csum = calc_ip_csum(buf, len - 20 + 12);
+	talloc_free(buf);
+	return csum;
+}
+
+/* Check TCP/IP packet */
+static void check_packet(const void *ctx, uint8_t *packet, int len)
+{
+	/* Check IP header */
+	OSMO_ASSERT(len > 20);
+	OSMO_ASSERT(calc_ip_csum(packet, 20) == 0);
+
+	printf("packet[9]=%02x\n", packet[9]);
+
+	/* Check TCP packet */
+	if (packet[9] != 0x06)
+		return;
+	OSMO_ASSERT(len > 40);
+	OSMO_ASSERT(calc_tcpip_csum(ctx, packet, len) == 0);
+}
+
+/* Compress / Decompress packets */
+static void test_slhc(const void *ctx)
+{
+	char packet_ascii[2048];
+	int i;
+
+	struct slcompress *comp;
+	uint8_t packet[1024];
+	int packet_len;
+	uint8_t packet_compr[1024];
+	int packet_compr_len;
+	uint8_t packet_decompr[1024];
+	int packet_decompr_len;
+
+	printf("Allocating compression state...\n");
+	comp = slhc_init(ctx, SLOTS, SLOTS);
+	OSMO_ASSERT(comp);
+
+	for (i = 0; i < PACKETS_LEN; i++) {
+		printf("Testing with packet No. %d\n", i);
+
+		/* Read input file */
+		memset(packet_ascii, 0, sizeof(packet_ascii));
+		memset(packet, 0, sizeof(packet));
+		memset(packet_compr, 0, sizeof(packet_compr));
+		memset(packet_decompr, 0, sizeof(packet_decompr));
+
+		OSMO_ASSERT(strlen(packets[i]) < sizeof(packet_ascii));
+		strcpy(packet_ascii, packets[i]);
+
+		packet_len =
+		    osmo_hexparse(packet_ascii, packet, sizeof(packet));
+		check_packet(ctx, packet, packet_len);
+
+		/* Run compression/decompression algorithm */
+		printf("Compressing...\n");
+		packet_compr_len =
+		    compress(packet_compr, packet, packet_len, comp);
+		printf("Decompressing...\n");
+		packet_decompr_len =
+		    expand(packet_decompr, packet_compr, packet_compr_len,
+			   comp);
+		OSMO_ASSERT(packet_decompr_len == packet_len);
+		check_packet(ctx, packet_decompr, packet_decompr_len);
+
+		/* Display results */
+		printf("Results:\n");
+		if (packet_compr_len > DISP_MAX_BYTES)
+			packet_compr_len = DISP_MAX_BYTES;
+		if (packet_len > DISP_MAX_BYTES)
+			packet_len = DISP_MAX_BYTES;
+		if (packet_decompr_len > DISP_MAX_BYTES)
+			packet_decompr_len = DISP_MAX_BYTES;
+		printf("Original Packet:    (%i bytes) %s\n", packet_len,
+		       osmo_hexdump_nospc(packet, packet_len));
+		printf("DecompressedPacket: (%i bytes) %s\n",
+		       packet_decompr_len, osmo_hexdump_nospc(packet_decompr,
+							      packet_decompr_len));
+		printf("CompressedPacket:   (%i bytes) %s\n", packet_compr_len,
+		       osmo_hexdump_nospc(packet_compr, packet_compr_len));
+		slhc_o_status(comp);
+		slhc_o_status(comp);
+
+		printf("\n");
+	}
+
+	printf("Freeing compression state...\n");
+	slhc_free(comp);
+	printf("\n");
+}
+
+static struct log_info_cat gprs_categories[] = {
+	[DSNDCP] = {
+		    .name = "DSNDCP",
+		    .description =
+		    "GPRS Sub-Network Dependent Control Protocol (SNDCP)",
+		    .enabled = 1,.loglevel = LOGL_DEBUG,
+		    },
+	[DSLHC] = {
+		   .name = "DSLHC",
+		   .description =
+		   "Van Jacobson RFC1144 TCP/IP header compression (SLHC)",
+		   .enabled = 1,.loglevel = LOGL_DEBUG,
+		   }
+};
+
+static struct log_info info = {
+	.cat = gprs_categories,
+	.num_cat = ARRAY_SIZE(gprs_categories),
+};
+
+int main(int argc, char **argv)
+{
+	void *ctx;
+
+	osmo_init_logging(&info);
+
+	ctx = talloc_named_const(NULL, 0, "slhc_ctx");
+
+	test_slhc(ctx);
+
+	printf("Done\n");
+
+	talloc_report_full(ctx, stderr);
+	OSMO_ASSERT(talloc_total_blocks(ctx) == 1);
+	return 0;
+}
+
+/* stubs */
+struct osmo_prim_hdr;
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	abort();
+}