diff options
Diffstat (limited to 'src/plugins/srtp/srtp.c')
| -rw-r--r-- | src/plugins/srtp/srtp.c | 994 |
1 files changed, 994 insertions, 0 deletions
diff --git a/src/plugins/srtp/srtp.c b/src/plugins/srtp/srtp.c new file mode 100644 index 00000000000..98bf9085da3 --- /dev/null +++ b/src/plugins/srtp/srtp.c @@ -0,0 +1,994 @@ +/* + * Copyright (c) 2021 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <srtp/srtp.h> +#include <vnet/session/application_interface.h> +#include <vnet/session/session.h> + +static srtp_main_t srtp_main; + +static void srtp_disconnect (u32 ctx_handle, u32 thread_index); +static void srtp_disconnect_transport (srtp_tc_t *ctx); + +static inline u32 +srtp_ctx_alloc_w_thread (u32 thread_index) +{ + srtp_tc_t *ctx; + pool_get_zero (srtp_main.ctx_pool[thread_index], ctx); + ctx->c_thread_index = thread_index; + ctx->srtp_ctx_handle = ctx - srtp_main.ctx_pool[thread_index]; + ctx->app_session_handle = SESSION_INVALID_HANDLE; + return ctx->srtp_ctx_handle; +} + +static inline srtp_tc_t * +srtp_ctx_get_w_thread (u32 ctx_index, u32 thread_index) +{ + return pool_elt_at_index (srtp_main.ctx_pool[thread_index], ctx_index); +} + +static void +srtp_init_policy (srtp_tc_t *ctx, transport_endpt_cfg_srtp_t *cfg) +{ + transport_endpt_cfg_srtp_policy_t *sp_cfg; + srtp_policy_t *sp; + int i; + + for (i = 0; i < 2; i++) + { + sp = &ctx->srtp_policy[i]; + sp_cfg = &cfg->policies[i]; + + srtp_crypto_policy_set_rtp_default (&sp->rtp); + srtp_crypto_policy_set_rtcp_default (&sp->rtcp); + sp->ssrc.type = sp_cfg->ssrc_type; + sp->ssrc.value = sp_cfg->ssrc_value; + sp->key = clib_mem_alloc (sp_cfg->key_len); + clib_memcpy (sp->key, sp_cfg->key, sp_cfg->key_len); + sp->ekt = 0; + sp->next = i < 1 ? &ctx->srtp_policy[i + 1] : 0; + sp->window_size = sp_cfg->window_size; + sp->allow_repeat_tx = sp_cfg->allow_repeat_tx; + } +} + +static void +srtp_ctx_free_policy (srtp_tc_t *ctx) +{ + clib_mem_free (ctx->srtp_policy[0].key); + clib_mem_free (ctx->srtp_policy[1].key); +} + +void +srtp_ctx_free (srtp_tc_t *ctx) +{ + if (!ctx->is_migrated) + srtp_ctx_free_policy (ctx); + pool_put (srtp_main.ctx_pool[ctx->c_thread_index], ctx); +} + +static inline u32 +srtp_ctx_attach (u32 thread_index, void *ctx_ptr) +{ + srtp_tc_t *ctx; + + pool_get (srtp_main.ctx_pool[thread_index], ctx); + clib_memcpy (ctx, ctx_ptr, sizeof (*ctx)); + + ctx->c_thread_index = thread_index; + ctx->srtp_ctx_handle = ctx - srtp_main.ctx_pool[thread_index]; + return 0; +} + +static inline void * +srtp_ctx_detach (srtp_tc_t *ctx) +{ + srtp_tc_t *sc; + + sc = clib_mem_alloc (sizeof (*sc)); + clib_memcpy (sc, ctx, sizeof (*sc)); + + return sc; +} + +u32 +srtp_listener_ctx_alloc (void) +{ + srtp_main_t *sm = &srtp_main; + srtp_tc_t *ctx; + + pool_get_zero (sm->listener_ctx_pool, ctx); + return ctx - sm->listener_ctx_pool; +} + +void +srtp_listener_ctx_free (srtp_tc_t *ctx) +{ + srtp_ctx_free_policy (ctx); + if (CLIB_DEBUG) + clib_memset (ctx, 0xfb, sizeof (*ctx)); + pool_put (srtp_main.listener_ctx_pool, ctx); +} + +srtp_tc_t * +srtp_listener_ctx_get (u32 ctx_index) +{ + return pool_elt_at_index (srtp_main.listener_ctx_pool, ctx_index); +} + +u32 +srtp_listener_ctx_index (srtp_tc_t *ctx) +{ + return (ctx - srtp_main.listener_ctx_pool); +} + +static int +srtp_ctx_init_client (srtp_tc_t *ctx) +{ + session_t *app_session; + app_worker_t *app_wrk; + session_error_t err; + + if (srtp_create (&ctx->srtp_ctx, &ctx->srtp_policy[0]) != srtp_err_status_ok) + { + SRTP_DBG (0, "failed to init srtp ctx"); + return -1; + } + + app_wrk = app_worker_get (ctx->parent_app_wrk_index); + app_session = session_get (ctx->c_s_index, ctx->c_thread_index); + app_session->app_wrk_index = ctx->parent_app_wrk_index; + app_session->connection_index = ctx->srtp_ctx_handle; + app_session->session_type = + session_type_from_proto_and_ip (TRANSPORT_PROTO_SRTP, ctx->udp_is_ip4); + + if ((err = app_worker_init_connected (app_wrk, app_session))) + goto failed; + + app_session->session_state = SESSION_STATE_READY; + if (app_worker_connect_notify (app_wrk, app_session, SESSION_E_NONE, + ctx->parent_app_api_context)) + { + SRTP_DBG (0, "failed to notify app"); + app_session->session_state = SESSION_STATE_CONNECTING; + srtp_disconnect (ctx->srtp_ctx_handle, vlib_get_thread_index ()); + return -1; + } + + ctx->app_session_handle = session_handle (app_session); + + return 0; + +failed: + /* Free app session pre-allocated when transport was established */ + session_free (session_get (ctx->c_s_index, ctx->c_thread_index)); + ctx->no_app_session = 1; + srtp_disconnect (ctx->srtp_ctx_handle, vlib_get_thread_index ()); + return app_worker_connect_notify (app_wrk, 0, err, + ctx->parent_app_api_context); +} + +static int +srtp_ctx_init_server (srtp_tc_t *ctx) +{ + session_t *app_listener, *app_session; + app_worker_t *app_wrk; + srtp_tc_t *lctx; + int rv; + + if (srtp_create (&ctx->srtp_ctx, ctx->srtp_policy) != srtp_err_status_ok) + return -1; + + lctx = srtp_listener_ctx_get (ctx->listener_ctx_index); + app_listener = listen_session_get_from_handle (lctx->app_session_handle); + + app_session = session_get (ctx->c_s_index, ctx->c_thread_index); + app_session->app_wrk_index = ctx->parent_app_wrk_index; + app_session->connection_index = ctx->srtp_ctx_handle; + app_session->session_type = app_listener->session_type; + app_session->listener_handle = listen_session_get_handle (app_listener); + app_session->session_state = SESSION_STATE_ACCEPTING; + + if ((rv = app_worker_init_accepted (app_session))) + { + SRTP_DBG (1, "failed to allocate fifos"); + session_free (app_session); + return rv; + } + ctx->app_session_handle = session_handle (app_session); + ctx->parent_app_wrk_index = app_session->app_wrk_index; + app_wrk = app_worker_get (app_session->app_wrk_index); + return app_worker_accept_notify (app_wrk, app_session); +} + +static int +srtp_ctx_deinit (srtp_tc_t *ctx) +{ + if (srtp_dealloc (ctx->srtp_ctx)) + SRTP_DBG (0, "%u failed to cleanup srtp state", ctx->c_c_index); + return 0; +} + +static inline int +srtp_ctx_write (srtp_tc_t *ctx, session_t *app_session, + transport_send_params_t *sp) +{ + u32 n_wrote = 0, to_deq, dgram_sz; + session_dgram_pre_hdr_t hdr; + app_session_transport_t at; + svm_msg_q_t *mq; + session_t *us; + u8 buf[2000]; + int rv, len; + + sp->max_burst_size = sp->max_burst_size * TRANSPORT_PACER_MIN_MSS; + + us = session_get_from_handle (ctx->srtp_session_handle); + to_deq = svm_fifo_max_dequeue_cons (app_session->tx_fifo); + mq = session_main_get_vpp_event_queue (us->thread_index); + + while (to_deq > 0) + { + /* Peeking only pre-header dgram because the session is connected */ + rv = svm_fifo_peek (app_session->tx_fifo, 0, sizeof (hdr), (u8 *) &hdr); + ASSERT (rv == sizeof (hdr) && hdr.data_length < vec_len (buf)); + ASSERT (to_deq >= hdr.data_length + SESSION_CONN_HDR_LEN); + + dgram_sz = hdr.data_length + SESSION_CONN_HDR_LEN; + if (svm_fifo_max_enqueue_prod (us->tx_fifo) < dgram_sz + 1000) + { + svm_fifo_add_want_deq_ntf (us->tx_fifo, SVM_FIFO_WANT_DEQ_NOTIF); + transport_connection_deschedule (&ctx->connection); + sp->flags |= TRANSPORT_SND_F_DESCHED; + goto done; + } + + rv = svm_fifo_peek (app_session->tx_fifo, SESSION_CONN_HDR_LEN, + hdr.data_length, buf); + ASSERT (rv == hdr.data_length); + svm_fifo_dequeue_drop (app_session->tx_fifo, dgram_sz); + + len = rv; + + rv = srtp_protect (ctx->srtp_ctx, buf, &len); + if (rv != srtp_err_status_ok) + { + SRTP_DBG (0, "failed to protect %u", rv); + return 0; + } + + rv = app_send_dgram_raw (us->tx_fifo, &at, mq, (u8 *) buf, len, + SESSION_IO_EVT_TX, 1 /* do_evt */, + 0 /* noblock */); + ASSERT (rv == len); + + n_wrote += rv; + to_deq -= dgram_sz; + } + +done: + + if (svm_fifo_needs_deq_ntf (app_session->tx_fifo, n_wrote)) + session_dequeue_notify (app_session); + + if (n_wrote) + { + if (svm_fifo_set_event (us->tx_fifo)) + session_send_io_evt_to_thread (us->tx_fifo, SESSION_IO_EVT_TX); + } + + if (PREDICT_FALSE (ctx->app_closed && + !svm_fifo_max_enqueue_prod (us->rx_fifo))) + { + srtp_disconnect_transport (ctx); + session_transport_closed_notify (&ctx->connection); + } + + return n_wrote > 0 ? clib_max (n_wrote / TRANSPORT_PACER_MIN_MSS, 1) : 0; +} + +int +srtp_add_vpp_q_builtin_rx_evt (session_t *s) +{ + if (svm_fifo_set_event (s->rx_fifo)) + session_send_io_evt_to_thread (s->rx_fifo, SESSION_IO_EVT_BUILTIN_RX); + return 0; +} + +void +srtp_notify_app_enqueue (srtp_tc_t *ctx, session_t *app_session) +{ + app_worker_t *app_wrk; + app_wrk = app_worker_get_if_valid (app_session->app_wrk_index); + if (PREDICT_TRUE (app_wrk != 0)) + app_worker_lock_and_send_event (app_wrk, app_session, SESSION_IO_EVT_RX); +} + +static inline int +srtp_ctx_read (srtp_tc_t *ctx, session_t *us) +{ + app_session_transport_t at; + session_dgram_hdr_t hdr; + session_t *app_session; + u32 n_read = 0; + u8 buf[2000]; + int rv, len; + + app_session = session_get_from_handle (ctx->app_session_handle); + svm_fifo_fill_chunk_list (app_session->rx_fifo); + + while (svm_fifo_max_dequeue_cons (us->rx_fifo) > 0) + { + if (svm_fifo_max_enqueue_prod (app_session->rx_fifo) < 2000) + { + srtp_add_vpp_q_builtin_rx_evt (us); + goto done; + } + + rv = app_recv_dgram_raw (us->rx_fifo, (u8 *) buf, 2000, &at, + 0 /* clear evt */, 0 /* peek */); + ASSERT (rv > 0); + len = rv; + + rv = srtp_unprotect (ctx->srtp_ctx, buf, &len); + + if (rv != srtp_err_status_ok) + { + SRTP_DBG (0, "failed to unprotect %d", rv); + return 0; + } + n_read += len; + + hdr.data_length = len; + hdr.data_offset = 0; + + svm_fifo_seg_t segs[2] = { { (u8 *) &hdr, sizeof (hdr) }, { buf, len } }; + + rv = svm_fifo_enqueue_segments (app_session->rx_fifo, segs, 2, + 0 /* allow partial */); + ASSERT (rv > 0); + } + +done: + + srtp_notify_app_enqueue (ctx, app_session); + + return n_read; +} + +int +srtp_add_segment_callback (u32 client_index, u64 segment_handle) +{ + /* No-op for builtin */ + return 0; +} + +int +srtp_del_segment_callback (u32 client_index, u64 segment_handle) +{ + return 0; +} + +void +srtp_session_disconnect_callback (session_t *us) +{ + clib_warning ("udp %u disconnected?", us->session_index); +} + +void +srtp_session_reset_callback (session_t *us) +{ + clib_warning ("udp %u reset?", us->session_index); +} + +static int +srtp_session_connected_callback (u32 srtp_app_index, u32 ctx_handle, + session_t *us, session_error_t err) +{ + session_t *app_session; + session_type_t st; + srtp_tc_t *ctx; + + ctx = srtp_ctx_get_w_thread (ctx_handle, 1 /* udp allocs on thread 1 */); + + ctx->srtp_session_handle = session_handle (us); + ctx->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP; + us->opaque = ctx_handle; + + /* Preallocate app session. Avoids allocating a session on srtp_session rx + * and potentially invalidating the session pool */ + app_session = session_alloc (ctx->c_thread_index); + app_session->session_state = SESSION_STATE_CREATED; + ctx->c_s_index = app_session->session_index; + + st = session_type_from_proto_and_ip (TRANSPORT_PROTO_SRTP, ctx->udp_is_ip4); + app_session->session_type = st; + app_session->connection_index = ctx->srtp_ctx_handle; + + return srtp_ctx_init_client (ctx); +} + +int +srtp_session_accept_callback (session_t *us) +{ + session_t *srtp_listener, *app_session; + srtp_tc_t *lctx, *ctx; + u32 ctx_handle; + + srtp_listener = listen_session_get_from_handle (us->listener_handle); + lctx = srtp_listener_ctx_get (srtp_listener->opaque); + + ctx_handle = srtp_ctx_alloc_w_thread (us->thread_index); + ctx = srtp_ctx_get_w_thread (ctx_handle, us->thread_index); + clib_memcpy_fast (ctx, lctx, sizeof (*lctx)); + ctx->c_thread_index = vlib_get_thread_index (); + ctx->srtp_ctx_handle = ctx_handle; + us->session_state = SESSION_STATE_READY; + us->opaque = ctx_handle; + ctx->srtp_session_handle = session_handle (us); + ctx->listener_ctx_index = srtp_listener->opaque; + ctx->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP; + + ctx->srtp_policy[0].key = clib_mem_alloc (SRTP_MAX_KEYLEN); + clib_memcpy (ctx->srtp_policy[0].key, lctx->srtp_policy[0].key, + SRTP_MAX_KEYLEN); + ctx->srtp_policy[1].key = clib_mem_alloc (SRTP_MAX_KEYLEN); + clib_memcpy (ctx->srtp_policy[1].key, lctx->srtp_policy[1].key, + SRTP_MAX_KEYLEN); + + app_session = session_alloc (ctx->c_thread_index); + app_session->session_state = SESSION_STATE_CREATED; + ctx->c_s_index = app_session->session_index; + + SRTP_DBG (1, "Accept on listener %u new connection [%u]%x", + srtp_listener->opaque, vlib_get_thread_index (), ctx_handle); + + return srtp_ctx_init_server (ctx); +} + +int +srtp_app_rx_callback (session_t *us) +{ + srtp_tc_t *ctx; + + ctx = srtp_ctx_get_w_thread (us->opaque, us->thread_index); + srtp_ctx_read (ctx, us); + return 0; +} + +int +srtp_app_tx_callback (session_t *us) +{ + srtp_tc_t *ctx; + + ctx = srtp_ctx_get_w_thread (us->opaque, us->thread_index); + transport_connection_reschedule (&ctx->connection); + + return 0; +} + +static void +srtp_app_session_cleanup (session_t *s, session_cleanup_ntf_t ntf) +{ + srtp_tc_t *ctx; + + if (ntf == SESSION_CLEANUP_TRANSPORT) + { + /* Allow cleanup of tcp session */ + if (s->session_state == SESSION_STATE_TRANSPORT_DELETED) + session_close (s); + return; + } + + ctx = srtp_ctx_get_w_thread (s->opaque, s->thread_index); + if (!ctx->no_app_session) + session_transport_delete_notify (&ctx->connection); + srtp_ctx_deinit (ctx); + srtp_ctx_free (ctx); +} + +static void +srtp_migrate_ctx_reply (void *arg) +{ + u32 ctx_index = pointer_to_uword (arg); + srtp_tc_t *ctx; + + ctx = srtp_ctx_get_w_thread (ctx_index, vlib_get_thread_index ()); + srtp_ctx_free (ctx); +} + +static void +srtp_migrate_ctx (void *arg) +{ + u32 ctx_handle, thread_index, old_thread_index, old_ctx_index; + srtp_tc_t *ctx = (srtp_tc_t *) arg; + session_t *us, *new_app_session; + void *rargs; + + old_thread_index = ctx->c_thread_index; + old_ctx_index = ctx->c_c_index; + thread_index = session_thread_from_handle (ctx->srtp_session_handle); + ASSERT (thread_index == vlib_get_thread_index ()); + + ctx_handle = srtp_ctx_attach (thread_index, ctx); + ctx = srtp_ctx_get_w_thread (ctx_handle, thread_index); + ctx->srtp_ctx_handle = ctx_handle; + SRTP_DBG (1, "migrated ctx handle %u", ctx_handle); + + us = session_get_from_handle (ctx->srtp_session_handle); + us->opaque = ctx_handle; + us->flags &= ~SESSION_F_IS_MIGRATING; + if (svm_fifo_max_dequeue (us->tx_fifo)) + session_send_io_evt_to_thread (us->tx_fifo, SESSION_IO_EVT_TX); + + /* Migrate app session as well */ + session_dgram_connect_notify (&ctx->connection, old_thread_index, + &new_app_session); + + /* Call back original thread and ask for cleanup */ + rargs = uword_to_pointer ((uword) old_ctx_index, void *); + session_send_rpc_evt_to_thread (old_thread_index, srtp_migrate_ctx_reply, + rargs); +} + +static void +srtp_session_migrate_callback (session_t *us, session_handle_t new_sh) +{ + u32 new_thread = session_thread_from_handle (new_sh); + srtp_tc_t *ctx, *cloned_ctx; + + ctx = srtp_ctx_get_w_thread (us->opaque, us->thread_index); + ctx->srtp_session_handle = new_sh; + cloned_ctx = srtp_ctx_detach (ctx); + SRTP_DBG (1, "ctx %u attached to udp %x session migrating", + cloned_ctx->c_c_index, new_sh); + + session_send_rpc_evt_to_thread (new_thread, srtp_migrate_ctx, + (void *) cloned_ctx); + + /* Can't free ctx now because app might be sending as srtp is not + * connection oriented, so it won't wait for a handshake */ + ctx->is_migrated = 1; +} + +static session_cb_vft_t srtp_app_cb_vft = { + .session_accept_callback = srtp_session_accept_callback, + .session_disconnect_callback = srtp_session_disconnect_callback, + .session_connected_callback = srtp_session_connected_callback, + .session_reset_callback = srtp_session_reset_callback, + .add_segment_callback = srtp_add_segment_callback, + .del_segment_callback = srtp_del_segment_callback, + .builtin_app_rx_callback = srtp_app_rx_callback, + .builtin_app_tx_callback = srtp_app_tx_callback, + .session_migrate_callback = srtp_session_migrate_callback, + .session_cleanup_callback = srtp_app_session_cleanup, +}; + +static clib_error_t * +srtp_enable (vlib_main_t *vm, u8 is_en) +{ + u32 add_segment_size = 256 << 20, first_seg_size = 32 << 20; + vnet_app_detach_args_t _da, *da = &_da; + vnet_app_attach_args_t _a, *a = &_a; + u64 options[APP_OPTIONS_N_OPTIONS]; + srtp_main_t *sm = &srtp_main; + u32 fifo_size = 128 << 12; + + if (!is_en) + { + da->app_index = sm->app_index; + da->api_client_index = APP_INVALID_INDEX; + vnet_application_detach (da); + return 0; + } + + srtp_init (); + vec_validate (sm->ctx_pool, vlib_num_workers ()); + + first_seg_size = sm->first_seg_size ? sm->first_seg_size : first_seg_size; + fifo_size = sm->fifo_size ? sm->fifo_size : fifo_size; + + clib_memset (a, 0, sizeof (*a)); + clib_memset (options, 0, sizeof (options)); + + a->session_cb_vft = &srtp_app_cb_vft; + a->api_client_index = APP_INVALID_INDEX; + a->options = options; + a->name = format (0, "srtp"); + a->options[APP_OPTIONS_SEGMENT_SIZE] = first_seg_size; + a->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = add_segment_size; + a->options[APP_OPTIONS_RX_FIFO_SIZE] = fifo_size; + a->options[APP_OPTIONS_TX_FIFO_SIZE] = fifo_size; + a->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN; + a->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE; + a->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_IS_TRANSPORT_APP; + + if (vnet_application_attach (a)) + return clib_error_return (0, "failed to attach srtp app"); + + sm->app_index = a->app_index; + vec_free (a->name); + + return 0; +} + +int +srtp_connect (transport_endpoint_cfg_t *tep) +{ + vnet_connect_args_t _cargs = { {}, }, *cargs = &_cargs; + session_endpoint_cfg_t *sep; + srtp_main_t *sm = &srtp_main; + app_worker_t *app_wrk; + application_t *app; + srtp_tc_t *ctx; + u32 ctx_index; + int rv; + + sep = (session_endpoint_cfg_t *) tep; + if (!sep->ext_cfg) + return SESSION_E_NOEXTCFG; + + app_wrk = app_worker_get (sep->app_wrk_index); + app = application_get (app_wrk->app_index); + + ctx_index = srtp_ctx_alloc_w_thread (1 /* because of udp */); + ctx = srtp_ctx_get_w_thread (ctx_index, 1); + ctx->parent_app_wrk_index = sep->app_wrk_index; + ctx->parent_app_api_context = sep->opaque; + ctx->udp_is_ip4 = sep->is_ip4; + ctx->srtp_ctx_handle = ctx_index; + + srtp_init_policy (ctx, (transport_endpt_cfg_srtp_t *) sep->ext_cfg->data); + + clib_memcpy_fast (&cargs->sep, sep, sizeof (session_endpoint_t)); + cargs->sep.transport_proto = TRANSPORT_PROTO_UDP; + cargs->sep_ext.transport_flags = TRANSPORT_CFG_F_CONNECTED; + cargs->app_index = sm->app_index; + cargs->api_context = ctx_index; + cargs->sep_ext.ns_index = app->ns_index; + if ((rv = vnet_connect (cargs))) + return rv; + + SRTP_DBG (1, "New connect request %u", ctx_index); + return 0; +} + +static void +srtp_disconnect_transport (srtp_tc_t *ctx) +{ + vnet_disconnect_args_t a = { + .handle = ctx->srtp_session_handle, + .app_index = srtp_main.app_index, + }; + + if (vnet_disconnect_session (&a)) + SRTP_DBG (0, "disconnect returned"); +} + +static void +srtp_disconnect (u32 ctx_handle, u32 thread_index) +{ + session_t *app_session; + srtp_tc_t *ctx; + + SRTP_DBG (1, "App disconnecting %x", ctx_handle); + + ctx = srtp_ctx_get_w_thread (ctx_handle, thread_index); + + app_session = session_get_from_handle (ctx->app_session_handle); + if (!svm_fifo_max_dequeue_cons (app_session->tx_fifo)) + { + /* Confirm close */ + srtp_disconnect_transport (ctx); + session_transport_closed_notify (&ctx->connection); + } + else + { + /* Wait for all data to be written to udp */ + ctx->app_closed = 1; + } +} + +static u32 +srtp_start_listen (u32 app_listener_index, transport_endpoint_t *tep) +{ + vnet_listen_args_t _bargs, *args = &_bargs; + session_handle_t udp_al_handle; + srtp_main_t *sm = &srtp_main; + session_endpoint_cfg_t *sep; + session_t *srtp_listener; + session_t *app_listener; + app_worker_t *app_wrk; + application_t *app; + app_listener_t *al; + srtp_tc_t *lctx; + u32 lctx_index; + + sep = (session_endpoint_cfg_t *) tep; + if (!sep->ext_cfg) + return SESSION_E_NOEXTCFG; + + app_wrk = app_worker_get (sep->app_wrk_index); + app = application_get (app_wrk->app_index); + + clib_memset (args, 0, sizeof (*args)); + args->app_index = sm->app_index; + args->sep_ext = *sep; + args->sep_ext.ns_index = app->ns_index; + args->sep_ext.transport_proto = TRANSPORT_PROTO_UDP; + args->sep_ext.transport_flags = TRANSPORT_CFG_F_CONNECTED; + if (vnet_listen (args)) + return -1; + + lctx_index = srtp_listener_ctx_alloc (); + udp_al_handle = args->handle; + al = app_listener_get_w_handle (udp_al_handle); + srtp_listener = app_listener_get_session (al); + srtp_listener->opaque = lctx_index; + + app_listener = listen_session_get (app_listener_index); + + lctx = srtp_listener_ctx_get (lctx_index); + lctx->parent_app_wrk_index = sep->app_wrk_index; + lctx->srtp_session_handle = udp_al_handle; + lctx->app_session_handle = listen_session_get_handle (app_listener); + lctx->udp_is_ip4 = sep->is_ip4; + + srtp_init_policy (lctx, (transport_endpt_cfg_srtp_t *) sep->ext_cfg->data); + + SRTP_DBG (1, "Started listening %d", lctx_index); + return lctx_index; +} + +u32 +srtp_stop_listen (u32 lctx_index) +{ + session_endpoint_t sep = SESSION_ENDPOINT_NULL; + transport_connection_t *lc; + srtp_tc_t *lctx; + session_t *ls; + int rv; + + lctx = srtp_listener_ctx_get (lctx_index); + + /* Cleanup listener from session lookup table */ + ls = session_get_from_handle (lctx->srtp_session_handle); + lc = session_get_transport (ls); + + sep.fib_index = lc->fib_index; + sep.port = lc->lcl_port; + sep.is_ip4 = lc->is_ip4; + sep.transport_proto = TRANSPORT_PROTO_SRTP; + clib_memcpy (&sep.ip, &lc->lcl_ip, sizeof (lc->lcl_ip)); + session_lookup_del_session_endpoint2 (&sep); + + vnet_unlisten_args_t a = { + .handle = lctx->srtp_session_handle, + .app_index = srtp_main.app_index, + .wrk_map_index = 0 /* default wrk */ + }; + if ((rv = vnet_unlisten (&a))) + SRTP_DBG (0, "unlisten returned %d", rv); + + srtp_listener_ctx_free (lctx); + return 0; +} + +transport_connection_t * +srtp_connection_get (u32 ctx_index, u32 thread_index) +{ + srtp_tc_t *ctx; + ctx = srtp_ctx_get_w_thread (ctx_index, thread_index); + return &ctx->connection; +} + +transport_connection_t * +srtp_listener_get (u32 listener_index) +{ + srtp_tc_t *ctx; + ctx = srtp_listener_ctx_get (listener_index); + return &ctx->connection; +} + +int +srtp_custom_tx_callback (void *session, transport_send_params_t *sp) +{ + session_t *app_session = (session_t *) session; + srtp_tc_t *ctx; + + if (PREDICT_FALSE (app_session->session_state >= + SESSION_STATE_TRANSPORT_CLOSED)) + return 0; + + sp->flags = 0; + ctx = srtp_ctx_get_w_thread (app_session->connection_index, + app_session->thread_index); + if (PREDICT_FALSE (ctx->is_migrated)) + return 0; + + return srtp_ctx_write (ctx, app_session, sp); +} + +u8 * +format_srtp_ctx (u8 *s, va_list *args) +{ + srtp_tc_t *ctx = va_arg (*args, srtp_tc_t *); + u32 udp_si, udp_ti; + + session_parse_handle (ctx->srtp_session_handle, &udp_si, &udp_ti); + s = format (s, "[%d:%d][SRTP] app_wrk %u index %u udp %d:%d", + ctx->c_thread_index, ctx->c_s_index, ctx->parent_app_wrk_index, + ctx->srtp_ctx_handle, udp_ti, udp_si); + + return s; +} + +static u8 * +format_srtp_listener_ctx (u8 *s, va_list *args) +{ + session_t *udp_listener; + app_listener_t *al; + srtp_tc_t *ctx; + + ctx = va_arg (*args, srtp_tc_t *); + + al = app_listener_get_w_handle (ctx->srtp_session_handle); + udp_listener = app_listener_get_session (al); + s = format (s, "[%d:%d][SRTP] app_wrk %u udp %d:%d", ctx->c_thread_index, + ctx->c_s_index, ctx->parent_app_wrk_index, + udp_listener->thread_index, udp_listener->session_index); + + return s; +} + +static u8 * +format_srtp_ctx_state (u8 *s, va_list *args) +{ + srtp_tc_t *ctx; + session_t *us; + + ctx = va_arg (*args, srtp_tc_t *); + us = session_get (ctx->c_s_index, ctx->c_thread_index); + if (us->session_state == SESSION_STATE_LISTENING) + s = format (s, "%s", "LISTEN"); + else + { + if (us->session_state >= SESSION_STATE_TRANSPORT_CLOSED) + s = format (s, "%s", "CLOSED"); + else if (us->session_state == SESSION_STATE_APP_CLOSED) + s = format (s, "%s", "APP-CLOSED"); + else if (us->session_state >= SESSION_STATE_TRANSPORT_CLOSING) + s = format (s, "%s", "CLOSING"); + else + s = format (s, "%s", "ESTABLISHED"); + } + + return s; +} + +u8 * +format_srtp_connection (u8 *s, va_list *args) +{ + u32 ctx_index = va_arg (*args, u32); + u32 thread_index = va_arg (*args, u32); + u32 verbose = va_arg (*args, u32); + srtp_tc_t *ctx; + + ctx = srtp_ctx_get_w_thread (ctx_index, thread_index); + if (!ctx) + return s; + + s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_srtp_ctx, ctx); + if (verbose) + { + s = + format (s, "%-" SESSION_CLI_STATE_LEN "U", format_srtp_ctx_state, ctx); + if (verbose > 1) + s = format (s, "\n"); + } + return s; +} + +u8 * +format_srtp_listener (u8 *s, va_list *args) +{ + u32 tc_index = va_arg (*args, u32); + u32 __clib_unused thread_index = va_arg (*args, u32); + u32 verbose = va_arg (*args, u32); + srtp_tc_t *ctx = srtp_listener_ctx_get (tc_index); + + s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_srtp_listener_ctx, ctx); + if (verbose) + s = format (s, "%-" SESSION_CLI_STATE_LEN "U", format_srtp_ctx_state, ctx); + return s; +} + +u8 * +format_srtp_half_open (u8 *s, va_list *args) +{ + return 0; +} + +static void +srtp_transport_endpoint_get (u32 ctx_handle, u32 thread_index, + transport_endpoint_t *tep, u8 is_lcl) +{ + srtp_tc_t *ctx = srtp_ctx_get_w_thread (ctx_handle, thread_index); + session_t *udp_session; + + udp_session = session_get_from_handle (ctx->srtp_session_handle); + session_get_endpoint (udp_session, tep, is_lcl); +} + +static void +srtp_transport_listener_endpoint_get (u32 ctx_handle, + transport_endpoint_t *tep, u8 is_lcl) +{ + session_t *srtp_listener; + app_listener_t *al; + srtp_tc_t *ctx = srtp_listener_ctx_get (ctx_handle); + + al = app_listener_get_w_handle (ctx->srtp_session_handle); + srtp_listener = app_listener_get_session (al); + session_get_endpoint (srtp_listener, tep, is_lcl); +} + +static const transport_proto_vft_t srtp_proto = { + .enable = srtp_enable, + .connect = srtp_connect, + .close = srtp_disconnect, + .start_listen = srtp_start_listen, + .stop_listen = srtp_stop_listen, + .get_connection = srtp_connection_get, + .get_listener = srtp_listener_get, + .custom_tx = srtp_custom_tx_callback, + .format_connection = format_srtp_connection, + .format_half_open = format_srtp_half_open, + .format_listener = format_srtp_listener, + .get_transport_endpoint = srtp_transport_endpoint_get, + .get_transport_listener_endpoint = srtp_transport_listener_endpoint_get, + .transport_options = { + .name = "srtp", + .short_name = "R", + .tx_type = TRANSPORT_TX_INTERNAL, + .service_type = TRANSPORT_SERVICE_APP, + }, +}; + +static clib_error_t * +srtp_transport_init (vlib_main_t *vm) +{ + transport_register_protocol (TRANSPORT_PROTO_SRTP, &srtp_proto, + FIB_PROTOCOL_IP4, ~0); + transport_register_protocol (TRANSPORT_PROTO_SRTP, &srtp_proto, + FIB_PROTOCOL_IP6, ~0); + return 0; +} + +VLIB_INIT_FUNCTION (srtp_transport_init); + +VLIB_PLUGIN_REGISTER () = { + .version = VPP_BUILD_VER, + .description = "Secure Real-time Transport Protocol (SRTP)", + /* .default_disabled = 1, */ +}; + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |