2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vlib/vlib.h>
17 #include <vnet/vnet.h>
18 #include <vnet/pg/pg.h>
19 #include <vnet/ip/ip.h>
21 #include <vnet/udp/udp.h>
22 #include <vppinfra/hash.h>
23 #include <vppinfra/error.h>
24 #include <vppinfra/elog.h>
26 #include <vnet/udp/udp_packet.h>
28 #include <vlibmemory/api.h>
29 #include "../session/application_interface.h"
31 static char *udp_error_strings[] = {
32 #define udp_error(n,s) s,
33 #include "udp_error.def"
44 /* packet trace format function */
46 format_udp_input_trace (u8 * s, va_list * args)
48 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
49 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
50 udp_input_trace_t *t = va_arg (*args, udp_input_trace_t *);
52 s = format (s, "UDP_INPUT: connection %d, disposition %d, thread %d",
53 t->connection, t->disposition, t->thread_index);
57 #define foreach_udp_input_next \
58 _ (DROP, "error-drop")
62 #define _(s, n) UDP_INPUT_NEXT_##s,
63 foreach_udp_input_next
69 udp_input_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val)
71 if (PREDICT_TRUE (!val))
75 vlib_node_increment_counter (vm, udp4_input_node.index, evt, val);
77 vlib_node_increment_counter (vm, udp6_input_node.index, evt, val);
81 udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
82 vlib_frame_t * frame, u8 is_ip4)
84 u32 n_left_from, *from, *to_next;
85 u32 next_index, errors;
86 u32 my_thread_index = vm->thread_index;
88 from = vlib_frame_vector_args (frame);
89 n_left_from = frame->n_vectors;
90 next_index = node->cached_next_index;
92 while (n_left_from > 0)
96 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
98 while (n_left_from > 0 && n_left_to_next > 0)
102 u32 next0 = UDP_INPUT_NEXT_DROP;
103 u32 error0 = UDP_ERROR_ENQUEUED;
108 stream_session_t *s0;
109 transport_connection_t *tc0 = 0;
110 udp_connection_t *child0, *new_uc0;
113 /* speculatively enqueue b0 to the current next frame */
121 b0 = vlib_get_buffer (vm, bi0);
123 /* udp_local hands us a pointer to the udp data */
124 data0 = vlib_buffer_get_current (b0);
125 udp0 = (udp_header_t *) (data0 - sizeof (*udp0));
126 fib_index0 = vnet_buffer (b0)->ip.fib_index;
130 /* $$$$ fixme: udp_local doesn't do ip options correctly anyhow */
131 ip40 = (ip4_header_t *) (((u8 *) udp0) - sizeof (*ip40));
132 s0 = session_lookup_safe4 (fib_index0, &ip40->dst_address,
133 &ip40->src_address, udp0->dst_port,
134 udp0->src_port, TRANSPORT_PROTO_UDP);
138 ip60 = (ip6_header_t *) (((u8 *) udp0) - sizeof (*ip60));
139 s0 = session_lookup_safe6 (fib_index0, &ip60->dst_address,
140 &ip60->src_address, udp0->dst_port,
141 udp0->src_port, TRANSPORT_PROTO_UDP);
144 if (PREDICT_FALSE (s0 == 0))
146 error0 = UDP_ERROR_NO_LISTENER;
150 if (PREDICT_TRUE (s0->session_state == SESSION_STATE_READY))
152 tc0 = session_get_transport (s0);
154 else if (s0->session_state == SESSION_STATE_CONNECTING_READY)
157 * Clone the transport. It will be cleaned up with the
158 * session once we notify the session layer.
160 new_uc0 = udp_conenction_clone_safe (s0->connection_index,
162 ASSERT (s0->session_index == new_uc0->c_s_index);
165 * Drop the 'lock' on pool resize
167 session_pool_remove_peeker (s0->thread_index);
168 session_dgram_connect_notify (&new_uc0->connection,
169 s0->thread_index, &s0);
170 tc0 = &new_uc0->connection;
172 else if (s0->session_state == SESSION_STATE_LISTENING)
174 tc0 = listen_session_get_transport (s0);
176 child0 = udp_connection_alloc (my_thread_index);
179 ip_set (&child0->c_lcl_ip, &ip40->dst_address, 1);
180 ip_set (&child0->c_rmt_ip, &ip40->src_address, 1);
184 ip_set (&child0->c_lcl_ip, &ip60->dst_address, 0);
185 ip_set (&child0->c_rmt_ip, &ip60->src_address, 0);
187 child0->c_lcl_port = udp0->dst_port;
188 child0->c_rmt_port = udp0->src_port;
189 child0->c_is_ip4 = is_ip4;
190 child0->mtu = 1460; /* $$$$ policy */
192 if (stream_session_accept
193 (&child0->connection, tc0->s_index, 1))
195 error0 = UDP_ERROR_CREATE_SESSION;
198 s0 = session_get (child0->c_s_index, child0->c_thread_index);
199 s0->session_state = SESSION_STATE_READY;
200 tc0 = &child0->connection;
202 error0 = UDP_ERROR_LISTENER;
206 error0 = UDP_ERROR_NOT_READY;
210 written0 = session_enqueue_dgram_connection (s0, b0, tc0->proto,
212 if (PREDICT_FALSE (written0 < 0))
214 error0 = UDP_ERROR_FIFO_FULL;
219 b0->error = node->errors[error0];
221 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
222 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
224 udp_input_trace_t *t = vlib_add_trace (vm, node, b0,
227 t->connection = tc0 ? tc0->c_index : ~0;
228 t->disposition = error0;
229 t->thread_index = my_thread_index;
232 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
233 to_next, n_left_to_next,
237 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
240 errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_UDP,
242 udp_input_inc_counter (vm, is_ip4, UDP_ERROR_EVENT_FIFO_FULL, errors);
243 return frame->n_vectors;
246 vlib_node_registration_t udp4_input_node;
247 vlib_node_registration_t udp6_input_node;
250 udp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
251 vlib_frame_t * frame)
253 return udp46_input_inline (vm, node, frame, 1);
257 VLIB_REGISTER_NODE (udp4_input_node) =
259 .function = udp4_input,
260 .name = "udp4-input",
261 .vector_size = sizeof (u32),
262 .format_trace = format_udp_input_trace,
263 .type = VLIB_NODE_TYPE_INTERNAL,
264 .n_errors = ARRAY_LEN (udp_error_strings),
265 .error_strings = udp_error_strings,
266 .n_next_nodes = UDP_INPUT_N_NEXT,
268 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
269 foreach_udp_input_next
276 udp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
277 vlib_frame_t * frame)
279 return udp46_input_inline (vm, node, frame, 0);
283 VLIB_REGISTER_NODE (udp6_input_node) =
285 .function = udp6_input,
286 .name = "udp6-input",
287 .vector_size = sizeof (u32),
288 .format_trace = format_udp_input_trace,
289 .type = VLIB_NODE_TYPE_INTERNAL,
290 .n_errors = ARRAY_LEN (udp_error_strings),
291 .error_strings = udp_error_strings,
292 .n_next_nodes = UDP_INPUT_N_NEXT,
294 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
295 foreach_udp_input_next
302 * fd.io coding-style-patch-verification: ON
305 * eval: (c-set-style "gnu")