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/* 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_ethernet_header *h = (void*)buf;
struct avb_packet_aecp_header *reply = SPA_PTROFF(h, sizeof(*h), void);
memcpy(h, p, len);
AVB_PACKET_AECP_SET_STATUS(reply, AVB_AECP_STATUS_NOT_IMPLEMENTED);
return avb_server_send_packet(server, h->src, AVB_TSN_ETH, buf, 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)
{
SPA_FOR_EACH_ELEMENT_VAR(msg_info, i) {
if ((name == NULL && type == i->type) ||
(name != NULL && spa_streq(name, i->name)))
return 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_ethernet_header *h = message;
const struct avb_packet_aecp_header *p = SPA_PTROFF(h, sizeof(*h), void);
const struct msg_info *info;
int message_type;
if (ntohs(h->type) != AVB_TSN_ETH)
return 0;
if (memcmp(h->dest, mac, 6) != 0 &&
memcmp(h->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, message, len);
pw_log_debug("got AECP message %s", info->name);
if (info->handle == NULL)
return reply_not_implemented(aecp, message, len);
return info->handle(aecp, message, 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);
}
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