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authorDave Barach <dave@barachs.net>2017-02-28 15:15:56 -0500
committerDamjan Marion <dmarion.lists@gmail.com>2017-03-01 20:25:48 +0000
commit68b0fb0c620c7451ef1a6380c43c39de6614db51 (patch)
treef4188fa09723152f3ebfcebbbe4cacad903e0cf1 /src/vnet/udp/udp_input.c
parentf869028740aaebeb0375077d4d84fa07a17fff1a (diff)
VPP-598: tcp stack initial commit
Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351 Signed-off-by: Dave Barach <dave@barachs.net> Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/udp/udp_input.c')
-rw-r--r--src/vnet/udp/udp_input.c314
1 files changed, 314 insertions, 0 deletions
diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c
new file mode 100644
index 00000000000..4d509335c32
--- /dev/null
+++ b/src/vnet/udp/udp_input.c
@@ -0,0 +1,314 @@
+/*
+ * Copyright (c) 2016 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 <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ip/ip.h>
+
+#include <vnet/udp/udp.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+#include <vnet/udp/udp_packet.h>
+
+#include <vlibmemory/api.h>
+#include "../session/application_interface.h"
+
+vlib_node_registration_t udp4_uri_input_node;
+
+typedef struct
+{
+ u32 session;
+ u32 disposition;
+ u32 thread_index;
+} udp4_uri_input_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_udp4_uri_input_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ udp4_uri_input_trace_t *t = va_arg (*args, udp4_uri_input_trace_t *);
+
+ s = format (s, "UDP4_URI_INPUT: session %d, disposition %d, thread %d",
+ t->session, t->disposition, t->thread_index);
+ return s;
+}
+
+typedef enum
+{
+ UDP4_URI_INPUT_NEXT_DROP,
+ UDP4_URI_INPUT_N_NEXT,
+} udp4_uri_input_next_t;
+
+static char *udp4_uri_input_error_strings[] = {
+#define _(sym,string) string,
+ foreach_session_input_error
+#undef _
+};
+
+static uword
+udp4_uri_input_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ udp4_uri_input_next_t next_index;
+ udp_uri_main_t *um = vnet_get_udp_main ();
+ session_manager_main_t *smm = vnet_get_session_manager_main ();
+ u32 my_thread_index = vm->cpu_index;
+ u8 my_enqueue_epoch;
+ u32 *session_indices_to_enqueue;
+ static u32 serial_number;
+ int i;
+
+ my_enqueue_epoch = ++smm->current_enqueue_epoch[my_thread_index];
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0 = UDP4_URI_INPUT_NEXT_DROP;
+ u32 error0 = SESSION_ERROR_ENQUEUED;
+ udp_header_t *udp0;
+ ip4_header_t *ip0;
+ stream_session_t *s0;
+ svm_fifo_t *f0;
+ u16 udp_len0;
+ u8 *data0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ /* udp_local hands us a pointer to the udp data */
+
+ data0 = vlib_buffer_get_current (b0);
+ udp0 = (udp_header_t *) (data0 - sizeof (*udp0));
+
+ /* $$$$ fixme: udp_local doesn't do ip options correctly anyhow */
+ ip0 = (ip4_header_t *) (((u8 *) udp0) - sizeof (*ip0));
+ s0 = 0;
+
+ /* lookup session */
+ s0 = stream_session_lookup4 (&ip0->dst_address, &ip0->src_address,
+ udp0->dst_port, udp0->src_port,
+ SESSION_TYPE_IP4_UDP, my_thread_index);
+
+ /* no listener */
+ if (PREDICT_FALSE (s0 == 0))
+ {
+ error0 = SESSION_ERROR_NO_LISTENER;
+ goto trace0;
+ }
+
+ f0 = s0->server_rx_fifo;
+
+ /* established hit */
+ if (PREDICT_TRUE (s0->session_state == SESSION_STATE_READY))
+ {
+ udp_len0 = clib_net_to_host_u16 (udp0->length);
+
+ if (PREDICT_FALSE (udp_len0 > svm_fifo_max_enqueue (f0)))
+ {
+ error0 = SESSION_ERROR_FIFO_FULL;
+ goto trace0;
+ }
+
+ svm_fifo_enqueue_nowait (f0, 0 /* pid */ ,
+ udp_len0 - sizeof (*udp0),
+ (u8 *) (udp0 + 1));
+
+ b0->error = node->errors[SESSION_ERROR_ENQUEUED];
+
+ /* We need to send an RX event on this fifo */
+ if (s0->enqueue_epoch != my_enqueue_epoch)
+ {
+ s0->enqueue_epoch = my_enqueue_epoch;
+
+ vec_add1 (smm->session_indices_to_enqueue_by_thread
+ [my_thread_index],
+ s0 - smm->sessions[my_thread_index]);
+ }
+ }
+ /* listener hit */
+ else if (s0->session_state == SESSION_STATE_LISTENING)
+ {
+ udp_connection_t *us;
+ int rv;
+
+ error0 = SESSION_ERROR_NOT_READY;
+
+ /*
+ * create udp transport session
+ */
+ pool_get (um->udp_sessions[my_thread_index], us);
+
+ us->mtu = 1024; /* $$$$ policy */
+
+ us->c_lcl_ip4.as_u32 = ip0->dst_address.as_u32;
+ us->c_rmt_ip4.as_u32 = ip0->src_address.as_u32;
+ us->c_lcl_port = udp0->dst_port;
+ us->c_rmt_port = udp0->src_port;
+ us->c_proto = SESSION_TYPE_IP4_UDP;
+ us->c_c_index = us - um->udp_sessions[my_thread_index];
+
+ /*
+ * create stream session and attach the udp session to it
+ */
+ rv = stream_session_accept (&us->connection, s0->session_index,
+ SESSION_TYPE_IP4_UDP,
+ 1 /*notify */ );
+ if (rv)
+ error0 = rv;
+
+ }
+ else
+ {
+
+ error0 = SESSION_ERROR_NOT_READY;
+ goto trace0;
+ }
+
+ trace0:
+ b0->error = node->errors[error0];
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ udp4_uri_input_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+
+ t->session = ~0;
+ if (s0)
+ t->session = s0 - smm->sessions[my_thread_index];
+ t->disposition = error0;
+ t->thread_index = my_thread_index;
+ }
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ /* Send enqueue events */
+
+ session_indices_to_enqueue =
+ smm->session_indices_to_enqueue_by_thread[my_thread_index];
+
+ for (i = 0; i < vec_len (session_indices_to_enqueue); i++)
+ {
+ session_fifo_event_t evt;
+ unix_shared_memory_queue_t *q;
+ stream_session_t *s0;
+ application_t *server0;
+
+ /* Get session */
+ s0 = pool_elt_at_index (smm->sessions[my_thread_index],
+ session_indices_to_enqueue[i]);
+
+ /* Get session's server */
+ server0 = application_get (s0->app_index);
+
+ /* Built-in server? Deliver the goods... */
+ if (server0->cb_fns.builtin_server_rx_callback)
+ {
+ server0->cb_fns.builtin_server_rx_callback (s0);
+ continue;
+ }
+
+ /* Fabricate event */
+ evt.fifo = s0->server_rx_fifo;
+ evt.event_type = FIFO_EVENT_SERVER_RX;
+ evt.event_id = serial_number++;
+ evt.enqueue_length = svm_fifo_max_dequeue (s0->server_rx_fifo);
+
+ /* Add event to server's event queue */
+ q = server0->event_queue;
+
+ /* Don't block for lack of space */
+ if (PREDICT_TRUE (q->cursize < q->maxsize))
+ unix_shared_memory_queue_add (server0->event_queue, (u8 *) & evt,
+ 0 /* do wait for mutex */ );
+ else
+ {
+ vlib_node_increment_counter (vm, udp4_uri_input_node.index,
+ SESSION_ERROR_FIFO_FULL, 1);
+ }
+ if (1)
+ {
+ ELOG_TYPE_DECLARE (e) =
+ {
+ .format = "evt-enqueue: id %d length %d",.format_args = "i4i4",};
+ struct
+ {
+ u32 data[2];
+ } *ed;
+ ed = ELOG_DATA (&vlib_global_main.elog_main, e);
+ ed->data[0] = evt.event_id;
+ ed->data[1] = evt.enqueue_length;
+ }
+ }
+
+ vec_reset_length (session_indices_to_enqueue);
+
+ smm->session_indices_to_enqueue_by_thread[my_thread_index] =
+ session_indices_to_enqueue;
+
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (udp4_uri_input_node) =
+{
+ .function = udp4_uri_input_node_fn,.name = "udp4-uri-input",.vector_size =
+ sizeof (u32),.format_trace = format_udp4_uri_input_trace,.type =
+ VLIB_NODE_TYPE_INTERNAL,.n_errors =
+ ARRAY_LEN (udp4_uri_input_error_strings),.error_strings =
+ udp4_uri_input_error_strings,.n_next_nodes = UDP4_URI_INPUT_N_NEXT,
+ /* edit / add dispositions here */
+ .next_nodes =
+ {
+ [UDP4_URI_INPUT_NEXT_DROP] = "error-drop",}
+,};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */