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authorMarco Varlese <marco.varlese@suse.com>2017-10-30 18:17:21 +0100
committerFlorin Coras <florin.coras@gmail.com>2018-01-24 15:45:35 +0000
commit191a59401c0552e5ea79041f34456eb9fcc1f311 (patch)
tree286d871aee72cb37e6d751715e89c6b178c7b527 /src/vnet/sctp/builtin_server.c
parentce111d2ee3bacec2a09d8f5b664dcfafa0dd50c7 (diff)
SCTP stack (RFC4960)
== CONTENT == * SCTP chunks definition as per RFC4960; * Helper functions to set/get values to/from the corresponding chunks; * Hooks to the session/application layers; * Complete state-machine handling; * Implementation for unexpected chunk received in a certain state (state-machine error handling) * Support for 1-single connection; * Sample application to test receive/transmit data-path; * Test to validate SCTP stack; Change-Id: I1b55c455ab400be9513f4e094dadfc3181d2ebc9 Signed-off-by: Marco Varlese <marco.varlese@suse.com>
Diffstat (limited to 'src/vnet/sctp/builtin_server.c')
-rw-r--r--src/vnet/sctp/builtin_server.c472
1 files changed, 472 insertions, 0 deletions
diff --git a/src/vnet/sctp/builtin_server.c b/src/vnet/sctp/builtin_server.c
new file mode 100644
index 00000000000..81267e78434
--- /dev/null
+++ b/src/vnet/sctp/builtin_server.c
@@ -0,0 +1,472 @@
+/*
+ * Copyright (c) 2018 SUSE LLC.
+ * 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 <vnet/vnet.h>
+#include <vlibmemory/api.h>
+#include <vnet/session/application.h>
+#include <vnet/session/application_interface.h>
+
+typedef struct
+{
+ /*
+ * Server app parameters
+ */
+ svm_queue_t **vpp_queue;
+ svm_queue_t *vl_input_queue; /**< Sever's event queue */
+
+ u32 app_index; /**< Server app index */
+ u32 my_client_index; /**< API client handle */
+ u32 node_index; /**< process node index for evnt scheduling */
+
+ /*
+ * Config params
+ */
+ u8 no_echo; /**< Don't echo traffic */
+ u32 fifo_size; /**< Fifo size */
+ u32 rcv_buffer_size; /**< Rcv buffer size */
+ u32 prealloc_fifos; /**< Preallocate fifos */
+ u32 private_segment_count; /**< Number of private segments */
+ u32 private_segment_size; /**< Size of private segments */
+ char *server_uri; /**< Server URI */
+
+ /*
+ * Test state
+ */
+ u8 **rx_buf; /**< Per-thread RX buffer */
+ u64 byte_index;
+ u32 **rx_retries;
+
+ vlib_main_t *vlib_main;
+} builtin_server_main_t;
+
+builtin_server_main_t builtin_server_main;
+
+int
+builtin_sctp_session_accept_callback (stream_session_t * s)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+
+ bsm->vpp_queue[s->thread_index] =
+ session_manager_get_vpp_event_queue (s->thread_index);
+ s->session_state = SESSION_STATE_READY;
+ bsm->byte_index = 0;
+ vec_validate (bsm->rx_retries[s->thread_index], s->session_index);
+ bsm->rx_retries[s->thread_index][s->session_index] = 0;
+ return 0;
+}
+
+void
+builtin_sctp_session_disconnect_callback (stream_session_t * s)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ vnet_disconnect_args_t _a, *a = &_a;
+
+ a->handle = session_handle (s);
+ a->app_index = bsm->app_index;
+ vnet_disconnect_session (a);
+}
+
+void
+builtin_sctp_session_reset_callback (stream_session_t * s)
+{
+ clib_warning ("Reset session %U", format_stream_session, s, 2);
+ stream_session_cleanup (s);
+}
+
+
+int
+builtin_sctp_session_connected_callback (u32 app_index, u32 api_context,
+ stream_session_t * s, u8 is_fail)
+{
+ clib_warning ("called...");
+ return -1;
+}
+
+int
+builtin_sctp_add_segment_callback (u32 client_index,
+ const u8 * seg_name, u32 seg_size)
+{
+ clib_warning ("called...");
+ return -1;
+}
+
+int
+builtin_sctp_redirect_connect_callback (u32 client_index, void *mp)
+{
+ clib_warning ("called...");
+ return -1;
+}
+
+void
+test_bytes_sctp (builtin_server_main_t * bsm, int actual_transfer)
+{
+ int i;
+ u32 my_thread_id = vlib_get_thread_index ();
+
+ for (i = 0; i < actual_transfer; i++)
+ {
+ if (bsm->rx_buf[my_thread_id][i] != ((bsm->byte_index + i) & 0xff))
+ {
+ clib_warning ("at %lld expected %d got %d", bsm->byte_index + i,
+ (bsm->byte_index + i) & 0xff,
+ bsm->rx_buf[my_thread_id][i]);
+ }
+ }
+ bsm->byte_index += actual_transfer;
+}
+
+/*
+ * If no-echo, just read the data and be done with it
+ */
+int
+builtin_sctp_server_rx_callback_no_echo (stream_session_t * s)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ u32 my_thread_id = vlib_get_thread_index ();
+ int actual_transfer;
+ svm_fifo_t *rx_fifo;
+
+ rx_fifo = s->server_rx_fifo;
+
+ do
+ {
+ actual_transfer =
+ svm_fifo_dequeue_nowait (rx_fifo, bsm->rcv_buffer_size,
+ bsm->rx_buf[my_thread_id]);
+ }
+ while (actual_transfer > 0);
+ return 0;
+}
+
+int
+builtin_sctp_server_rx_callback (stream_session_t * s)
+{
+ u32 n_written, max_dequeue, max_enqueue, max_transfer;
+ int actual_transfer;
+ svm_fifo_t *tx_fifo, *rx_fifo;
+ builtin_server_main_t *bsm = &builtin_server_main;
+ session_fifo_event_t evt;
+ u32 thread_index = vlib_get_thread_index ();
+
+ ASSERT (s->thread_index == thread_index);
+
+ rx_fifo = s->server_rx_fifo;
+ tx_fifo = s->server_tx_fifo;
+
+ ASSERT (rx_fifo->master_thread_index == thread_index);
+ ASSERT (tx_fifo->master_thread_index == thread_index);
+
+ max_dequeue = svm_fifo_max_dequeue (s->server_rx_fifo);
+ max_enqueue = svm_fifo_max_enqueue (s->server_tx_fifo);
+
+ if (PREDICT_FALSE (max_dequeue == 0))
+ return 0;
+
+ /* Number of bytes we're going to copy */
+ max_transfer = (max_dequeue < max_enqueue) ? max_dequeue : max_enqueue;
+
+ /* No space in tx fifo */
+ if (PREDICT_FALSE (max_transfer == 0))
+ {
+ /* XXX timeout for session that are stuck */
+
+ rx_event:
+ /* Program self-tap to retry */
+ if (svm_fifo_set_event (rx_fifo))
+ {
+ svm_queue_t *q;
+ evt.fifo = rx_fifo;
+ evt.event_type = FIFO_EVENT_BUILTIN_RX;
+
+ q = bsm->vpp_queue[thread_index];
+ if (PREDICT_FALSE (q->cursize == q->maxsize))
+ clib_warning ("out of event queue space");
+ else if (svm_queue_add (q, (u8 *) & evt, 0))
+ clib_warning ("failed to enqueue self-tap");
+
+ if (bsm->rx_retries[thread_index][s->session_index] == 500000)
+ {
+ clib_warning ("session stuck: %U", format_stream_session, s, 2);
+ }
+ if (bsm->rx_retries[thread_index][s->session_index] < 500001)
+ bsm->rx_retries[thread_index][s->session_index]++;
+ }
+
+ return 0;
+ }
+
+ _vec_len (bsm->rx_buf[thread_index]) = max_transfer;
+
+ actual_transfer = svm_fifo_dequeue_nowait (rx_fifo, max_transfer,
+ bsm->rx_buf[thread_index]);
+ ASSERT (actual_transfer == max_transfer);
+
+// test_bytes (bsm, actual_transfer);
+
+ /*
+ * Echo back
+ */
+
+ n_written = svm_fifo_enqueue_nowait (tx_fifo, actual_transfer,
+ bsm->rx_buf[thread_index]);
+
+ if (n_written != max_transfer)
+ clib_warning ("short trout!");
+
+ if (svm_fifo_set_event (tx_fifo))
+ {
+ /* Fabricate TX event, send to vpp */
+ evt.fifo = tx_fifo;
+ evt.event_type = FIFO_EVENT_APP_TX;
+
+ if (svm_queue_add (bsm->vpp_queue[s->thread_index],
+ (u8 *) & evt, 0 /* do wait for mutex */ ))
+ clib_warning ("failed to enqueue tx evt");
+ }
+
+ if (PREDICT_FALSE (n_written < max_dequeue))
+ goto rx_event;
+
+ return 0;
+}
+
+static session_cb_vft_t builtin_session_cb_vft = {
+ .session_accept_callback = builtin_sctp_session_accept_callback,
+ .session_disconnect_callback = builtin_sctp_session_disconnect_callback,
+ .session_connected_callback = builtin_sctp_session_connected_callback,
+ .add_segment_callback = builtin_sctp_add_segment_callback,
+ .redirect_connect_callback = builtin_sctp_redirect_connect_callback,
+ .builtin_server_rx_callback = builtin_sctp_server_rx_callback,
+ .session_reset_callback = builtin_sctp_session_reset_callback
+};
+
+/* Abuse VPP's input queue */
+static int
+create_api_loopback (vlib_main_t * vm)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ api_main_t *am = &api_main;
+ vl_shmem_hdr_t *shmem_hdr;
+
+ shmem_hdr = am->shmem_hdr;
+ bsm->vl_input_queue = shmem_hdr->vl_input_queue;
+ bsm->my_client_index =
+ vl_api_memclnt_create_internal ("sctp_test_server", bsm->vl_input_queue);
+ return 0;
+}
+
+static int
+server_attach (u8 * appns_id, u64 appns_flags, u64 appns_secret)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ u8 segment_name[128];
+ u64 options[APP_OPTIONS_N_OPTIONS];
+ vnet_app_attach_args_t _a, *a = &_a;
+ u32 segment_size = 512 << 20;
+
+ memset (a, 0, sizeof (*a));
+ memset (options, 0, sizeof (options));
+
+ if (bsm->no_echo)
+ builtin_session_cb_vft.builtin_server_rx_callback =
+ builtin_sctp_server_rx_callback_no_echo;
+ else
+ builtin_session_cb_vft.builtin_server_rx_callback =
+ builtin_sctp_server_rx_callback;
+
+ if (bsm->private_segment_size)
+ segment_size = bsm->private_segment_size;
+
+ a->api_client_index = bsm->my_client_index;
+ a->session_cb_vft = &builtin_session_cb_vft;
+ a->options = options;
+ a->options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
+ a->options[APP_OPTIONS_RX_FIFO_SIZE] = bsm->fifo_size;
+ a->options[APP_OPTIONS_TX_FIFO_SIZE] = bsm->fifo_size;
+ a->options[APP_OPTIONS_PRIVATE_SEGMENT_COUNT] = bsm->private_segment_count;
+ a->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] =
+ bsm->prealloc_fifos ? bsm->prealloc_fifos : 1;
+
+ a->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
+ if (appns_id)
+ {
+ a->namespace_id = appns_id;
+ a->options[APP_OPTIONS_FLAGS] |= appns_flags;
+ a->options[APP_OPTIONS_NAMESPACE_SECRET] = appns_secret;
+ }
+ a->segment_name = segment_name;
+ a->segment_name_length = ARRAY_LEN (segment_name);
+
+ if (vnet_application_attach (a))
+ {
+ clib_warning ("failed to attach server");
+ return -1;
+ }
+ bsm->app_index = a->app_index;
+ return 0;
+}
+
+static int
+server_listen ()
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ vnet_bind_args_t _a, *a = &_a;
+ memset (a, 0, sizeof (*a));
+ a->app_index = bsm->app_index;
+ a->uri = bsm->server_uri;
+ return vnet_bind_uri (a);
+}
+
+static int
+server_create (vlib_main_t * vm, u8 * appns_id, u64 appns_flags,
+ u64 appns_secret)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ vlib_thread_main_t *vtm = vlib_get_thread_main ();
+ u32 num_threads;
+ int i;
+
+ if (bsm->my_client_index == (u32) ~ 0)
+ {
+ if (create_api_loopback (vm))
+ {
+ clib_warning ("failed to create api loopback");
+ return -1;
+ }
+ }
+
+ num_threads = 1 /* main thread */ + vtm->n_threads;
+ vec_validate (builtin_server_main.vpp_queue, num_threads - 1);
+ vec_validate (bsm->rx_buf, num_threads - 1);
+ vec_validate (bsm->rx_retries, num_threads - 1);
+
+ for (i = 0; i < num_threads; i++)
+ vec_validate (bsm->rx_buf[i], bsm->rcv_buffer_size);
+
+ if (server_attach (appns_id, appns_flags, appns_secret))
+ {
+ clib_warning ("failed to attach server");
+ return -1;
+ }
+ if (server_listen ())
+ {
+ clib_warning ("failed to start listening");
+ return -1;
+ }
+ return 0;
+}
+
+static clib_error_t *
+server_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ u8 server_uri_set = 0, *appns_id = 0;
+ u64 tmp, appns_flags = 0, appns_secret = 0;
+ int rv;
+
+ bsm->no_echo = 0;
+ bsm->fifo_size = 64 << 10;
+ bsm->rcv_buffer_size = 128 << 10;
+ bsm->prealloc_fifos = 0;
+ bsm->private_segment_count = 0;
+ bsm->private_segment_size = 0;
+ vec_free (bsm->server_uri);
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "no-echo"))
+ bsm->no_echo = 1;
+ else if (unformat (input, "fifo-size %d", &bsm->fifo_size))
+ bsm->fifo_size <<= 10;
+ else if (unformat (input, "rcv-buf-size %d", &bsm->rcv_buffer_size))
+ ;
+ else if (unformat (input, "prealloc-fifos %d", &bsm->prealloc_fifos))
+ ;
+ else if (unformat (input, "private-segment-count %d",
+ &bsm->private_segment_count))
+ ;
+ else if (unformat (input, "private-segment-size %U",
+ unformat_memory_size, &tmp))
+ {
+ if (tmp >= 0x100000000ULL)
+ return clib_error_return
+ (0, "private segment size %lld (%llu) too large", tmp, tmp);
+ bsm->private_segment_size = tmp;
+ }
+ else if (unformat (input, "uri %s", &bsm->server_uri))
+ server_uri_set = 1;
+ else if (unformat (input, "appns %_%v%_", &appns_id))
+ ;
+ else if (unformat (input, "all-scope"))
+ appns_flags |= (APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE
+ | APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE);
+ else if (unformat (input, "local-scope"))
+ appns_flags |= APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE;
+ else if (unformat (input, "global-scope"))
+ appns_flags |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
+ else if (unformat (input, "secret %lu", &appns_secret))
+ ;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+
+ vnet_session_enable_disable (vm, 1 /* turn on SCTP, etc. */ );
+
+ if (!server_uri_set)
+ bsm->server_uri = (char *) format (0, "sctp://0.0.0.0/1234%c", 0);
+
+ rv = server_create (vm, appns_id, appns_flags, appns_secret);
+ vec_free (appns_id);
+ switch (rv)
+ {
+ case 0:
+ break;
+ default:
+ return clib_error_return (0, "server_create returned %d", rv);
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (server_create_command, static) =
+{
+ .path = "test sctp server",
+ .short_help = "test sctp server [no echo][fifo-size <mbytes>] "
+ "[rcv-buf-size <bytes>][prealloc-fifos <count>]"
+ "[private-segment-count <count>][private-segment-size <bytes[m|g]>]"
+ "[uri <sctp://ip/port>]",
+ .function = server_create_command_fn,
+};
+/* *INDENT-ON* */
+
+clib_error_t *
+builtin_sctp_server_main_init (vlib_main_t * vm)
+{
+ builtin_server_main_t *bsm = &builtin_server_main;
+ bsm->my_client_index = ~0;
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (builtin_sctp_server_main_init);
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/