/* 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 #include #include "utils.h" #include "msrp.h" static const uint8_t mac[6] = AVB_MSRP_MAC; struct attr { struct spa_list link; struct avbtp_mrp_attribute attr; uint64_t stream_id; }; struct msrp { struct server *server; struct spa_hook server_listener; struct spa_list attributes; }; static struct attr *find_attr_by_stream_id(struct msrp *msrp, uint64_t stream_id) { struct attr *a; spa_list_for_each(a, &msrp->attributes, link) if (a->stream_id == stream_id) return a; return NULL; } static void attr_event(struct msrp *msrp, uint8_t type, int event) { struct attr *a; spa_list_for_each(a, &msrp->attributes, link) if (a->attr.type == type) avbtp_mrp_update_state(msrp->server->mrp, &a->attr, event, 0); } static void process_talker(struct msrp *msrp, uint8_t attr_type, const void *m, uint8_t event, uint8_t param, int num) { const struct avbtp_packet_msrp_talker *t = m; char buf[128]; struct attr *a; pw_log_info("talker"); pw_log_info(" %s", avbtp_utils_format_id(buf, sizeof(buf), t->stream_id)); a = find_attr_by_stream_id(msrp, be64toh(t->stream_id)); if (a) avbtp_mrp_event(msrp->server->mrp, &a->attr, event, param); } static void process_talker_fail(struct msrp *msrp, uint8_t attr_type, const void *m, uint8_t event, uint8_t param, int num) { const struct avbtp_packet_msrp_talker_fail *t = m; char buf[128]; pw_log_info("talker fail"); pw_log_info(" %s", avbtp_utils_format_id(buf, sizeof(buf), t->talker.stream_id)); } static void process_listener(struct msrp *msrp, uint8_t attr_type, const void *m, uint8_t event, uint8_t param, int num) { const struct avbtp_packet_msrp_listener *l = m; char buf[128]; pw_log_info("listener"); pw_log_info(" %s", avbtp_utils_format_id(buf, sizeof(buf), l->stream_id)); } static void process_domain(struct msrp *msrp, uint8_t attr_type, const void *m, uint8_t event, uint8_t param, int num) { const struct avbtp_packet_msrp_domain *d = m; pw_log_info("domain"); pw_log_info(" %d", d->sr_class_id); pw_log_info(" %d", d->sr_class_priority); pw_log_info(" %d", ntohs(d->sr_class_vid)); } static const struct { void (*dispatch) (struct msrp *msrp, uint8_t attr_type, const void *m, uint8_t event, uint8_t param, int num); } dispatch[] = { [AVBTP_MSRP_ATTRIBUTE_TYPE_TALKER_ADVERTISE] = { process_talker, }, [AVBTP_MSRP_ATTRIBUTE_TYPE_TALKER_FAILED] = { process_talker_fail, }, [AVBTP_MSRP_ATTRIBUTE_TYPE_LISTENER] = { process_listener, }, [AVBTP_MSRP_ATTRIBUTE_TYPE_DOMAIN] = { process_domain, }, }; static inline bool has_params(uint16_t type) { return type == AVBTP_MSRP_ATTRIBUTE_TYPE_LISTENER; } static int process(struct msrp *msrp, uint64_t now, const void *message, int len) { uint8_t *e = SPA_PTROFF(message, len, uint8_t); uint8_t *m = SPA_PTROFF(message, sizeof(struct avbtp_packet_mrp), uint8_t); while (m < e && (m[0] != 0 || m[1] != 0)) { const struct avbtp_packet_msrp_msg *msg = (const struct avbtp_packet_msrp_msg*)m; uint8_t attr_len = msg->attribute_length; uint8_t attr_type = msg->attribute_type; bool has_param = has_params(attr_type); if (!AVBTP_MSRP_ATTRIBUTE_TYPE_VALID(attr_type)) return -EINVAL; m += sizeof(*msg); while (m < e && (m[0] != 0 || m[1] != 0)) { const struct avbtp_packet_mrp_vector *v = (const struct avbtp_packet_mrp_vector*)m; uint16_t i, num_values = AVBTP_MRP_VECTOR_GET_NUM_VALUES(v); uint8_t event_len = (num_values+2)/3; uint8_t param_len = has_param ? (num_values+3)/4 : 0; int len = sizeof(*v) + attr_len + event_len + param_len; const uint8_t *first = v->first_value; uint8_t event[3], param[4] = { 0, }; if (m + len > e) return -EPROTO; if (v->lva) attr_event(msrp, attr_type, AVBTP_MRP_EVENT_RX_LVA); for (i = 0; i < num_values; i++) { if (i % 3 == 0) { uint8_t ep = first[attr_len + i/3]; event[2] = ep % 6; ep /= 6; event[1] = ep % 6; ep /= 6; event[0] = ep % 6; } if (has_param && (i % 4 == 0)) { uint8_t ep = first[attr_len + event_len + i/4]; param[3] = ep % 4; ep /= 4; param[2] = ep % 4; ep /= 4; param[1] = ep % 4; ep /= 4; param[0] = ep % 4; } dispatch[attr_type].dispatch(msrp, attr_type, first, event[i%3], param[i%4], i); } m += len; } } return 0; } static int msrp_message(void *data, uint64_t now, const void *message, int len) { struct msrp *msrp = data; const struct avbtp_packet_mrp *p = message; if (ntohs(p->eth.type) != AVB_MSRP_ETH) return 0; if (memcmp(p->eth.dest, mac, 6) != 0) return 0; pw_log_info("MSRP"); return process(msrp, now, message, len); } static void msrp_destroy(void *data) { struct msrp *msrp = data; spa_hook_remove(&msrp->server_listener); free(msrp); } static const struct server_events server_events = { AVBTP_VERSION_SERVER_EVENTS, .destroy = msrp_destroy, .message = msrp_message }; int avbtp_msrp_register(struct server *server) { struct msrp *msrp; msrp = calloc(1, sizeof(*msrp)); if (msrp == NULL) return -errno; msrp->server = server; spa_list_init(&msrp->attributes); avdecc_server_add_listener(server, &msrp->server_listener, &server_events, msrp); return 0; }