avb: avbtp -> avb

src/modules/module-avb/aecp.c

@@ -0,0 +1,168 @@
+/* AVB support
+ *
+ * Copyright © 2022 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <spa/utils/json.h>
+#include <spa/debug/mem.h>
+
+#include <pipewire/pipewire.h>
+
+#include "aecp.h"
+#include "aecp-aem.h"
+#include "internal.h"
+
+static const uint8_t mac[6] = AVB_BROADCAST_MAC;
+
+struct msg_info {
+	uint16_t type;
+	const char *name;
+	int (*handle) (struct aecp *aecp, const void *p, int len);
+};
+
+static int reply_not_implemented(struct aecp *aecp, const void *p, int len)
+{
+	struct server *server = aecp->server;
+	uint8_t buf[len];
+	struct avb_packet_aecp_header *reply = (struct avb_packet_aecp_header*)buf;
+
+	memcpy(reply, p, len);
+	AVB_PACKET_AECP_SET_STATUS(reply, AVB_AECP_STATUS_NOT_IMPLEMENTED);
+
+	return avb_server_send_packet(server, reply->hdr.eth.src,
+			AVB_TSN_ETH, reply, len);
+}
+
+static const struct msg_info msg_info[] = {
+	{ AVB_AECP_MESSAGE_TYPE_AEM_COMMAND, "aem-command", avb_aecp_aem_handle_command, },
+	{ AVB_AECP_MESSAGE_TYPE_AEM_RESPONSE, "aem-response", avb_aecp_aem_handle_response, },
+	{ AVB_AECP_MESSAGE_TYPE_ADDRESS_ACCESS_COMMAND, "address-access-command", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_ADDRESS_ACCESS_RESPONSE, "address-access-response", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_AVC_COMMAND, "avc-command", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_AVC_RESPONSE, "avc-response", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_VENDOR_UNIQUE_COMMAND, "vendor-unique-command", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_VENDOR_UNIQUE_RESPONSE, "vendor-unique-response", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_EXTENDED_COMMAND, "extended-command", NULL, },
+	{ AVB_AECP_MESSAGE_TYPE_EXTENDED_RESPONSE, "extended-response", NULL, },
+};
+
+static inline const struct msg_info *find_msg_info(uint16_t type, const char *name)
+{
+	uint32_t i;
+	for (i = 0; i < SPA_N_ELEMENTS(msg_info); i++) {
+		if ((name == NULL && type == msg_info[i].type) ||
+		    (name != NULL && spa_streq(name, msg_info[i].name)))
+			return &msg_info[i];
+	}
+	return NULL;
+}
+
+static int aecp_message(void *data, uint64_t now, const void *message, int len)
+{
+	struct aecp *aecp = data;
+	struct server *server = aecp->server;
+	const struct avb_packet_aecp_header *p = message;
+	const struct msg_info *info;
+	int message_type;
+
+	if (ntohs(p->hdr.eth.type) != AVB_TSN_ETH)
+		return 0;
+	if (memcmp(p->hdr.eth.dest, mac, 6) != 0 &&
+	    memcmp(p->hdr.eth.dest, server->mac_addr, 6) != 0)
+		return 0;
+	if (AVB_PACKET_GET_SUBTYPE(&p->hdr) != AVB_SUBTYPE_AECP)
+		return 0;
+
+	message_type = AVB_PACKET_AECP_GET_MESSAGE_TYPE(p);
+
+	info = find_msg_info(message_type, NULL);
+	if (info == NULL)
+		return reply_not_implemented(aecp, p, len);
+
+	pw_log_debug("got AECP message %s", info->name);
+
+	if (info->handle == NULL)
+		return reply_not_implemented(aecp, p, len);
+
+	return info->handle(aecp, p, len);
+}
+
+static void aecp_destroy(void *data)
+{
+	struct aecp *aecp = data;
+	spa_hook_remove(&aecp->server_listener);
+	free(aecp);
+}
+
+static int do_help(struct aecp *aecp, const char *args, FILE *out)
+{
+	fprintf(out, "{ \"type\": \"help\","
+			"\"text\": \""
+			  "/adp/help: this help \\n"
+			"\" }");
+	return 0;
+}
+
+static int aecp_command(void *data, uint64_t now, const char *command, const char *args, FILE *out)
+{
+	struct aecp *aecp = data;
+	int res;
+
+	if (!spa_strstartswith(command, "/aecp/"))
+		return 0;
+
+	command += strlen("/aecp/");
+
+	if (spa_streq(command, "help"))
+		res = do_help(aecp, args, out);
+	else
+		res = -ENOTSUP;
+
+	return res;
+}
+
+static const struct server_events server_events = {
+	AVB_VERSION_SERVER_EVENTS,
+	.destroy = aecp_destroy,
+	.message = aecp_message,
+	.command = aecp_command
+};
+
+struct avb_aecp *avb_aecp_register(struct server *server)
+{
+	struct aecp *aecp;
+
+	aecp = calloc(1, sizeof(*aecp));
+	if (aecp == NULL)
+		return NULL;
+
+	aecp->server = server;
+
+	avdecc_server_add_listener(server, &aecp->server_listener, &server_events, aecp);
+
+	return (struct avb_aecp*)aecp;
+}
+
+void avb_aecp_unregister(struct avb_aecp *aecp)
+{
+	aecp_destroy(aecp);
+}