2 * Copyright (c) 2016-2019 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 <vlibmemory/api.h>
17 #include <vlib/vlib.h>
19 #include <vppinfra/hash.h>
20 #include <vppinfra/error.h>
21 #include <vppinfra/elog.h>
23 #include <vnet/vnet.h>
24 #include <vnet/pg/pg.h>
25 #include <vnet/ip/ip.h>
26 #include <vnet/udp/udp.h>
27 #include <vnet/udp/udp_packet.h>
28 #include <vnet/session/session.h>
30 static char *udp_error_strings[] = {
31 #define udp_error(n,s) s,
32 #include "udp_error.def"
43 /* packet trace format function */
45 format_udp_input_trace (u8 * s, va_list * args)
47 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
48 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
49 udp_input_trace_t *t = va_arg (*args, udp_input_trace_t *);
51 s = format (s, "UDP_INPUT: connection %d, disposition %d, thread %d",
52 t->connection, t->disposition, t->thread_index);
56 #define foreach_udp_input_next \
57 _ (DROP, "error-drop")
61 #define _(s, n) UDP_INPUT_NEXT_##s,
62 foreach_udp_input_next
68 udp_input_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val)
71 vlib_node_increment_counter (vm, udp4_input_node.index, evt, val);
73 vlib_node_increment_counter (vm, udp6_input_node.index, evt, val);
76 #define udp_store_err_counters(vm, is_ip4, cnts) \
79 for (i = 0; i < UDP_N_ERROR; i++) \
81 udp_input_inc_counter(vm, is_ip4, i, cnts[i]); \
84 #define udp_inc_err_counter(cnts, err, val) \
90 udp_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node,
91 vlib_buffer_t * b, session_t * s, u16 error0)
95 if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_IS_TRACED)))
98 t = vlib_add_trace (vm, node, b, sizeof (*t));
99 t->connection = s ? s->connection_index : ~0;
100 t->disposition = error0;
101 t->thread_index = s ? s->thread_index : vm->thread_index;
104 static udp_connection_t *
105 udp_connection_accept (udp_connection_t * listener, session_dgram_hdr_t * hdr,
108 udp_connection_t *uc;
110 uc = udp_connection_alloc (thread_index);
111 ip_copy (&uc->c_lcl_ip, &hdr->lcl_ip, hdr->is_ip4);
112 ip_copy (&uc->c_rmt_ip, &hdr->rmt_ip, hdr->is_ip4);
113 uc->c_lcl_port = hdr->lcl_port;
114 uc->c_rmt_port = hdr->rmt_port;
115 uc->c_is_ip4 = hdr->is_ip4;
116 uc->c_fib_index = listener->c_fib_index;
117 uc->mss = listener->mss;
118 uc->flags |= UDP_CONN_F_CONNECTED;
120 if (session_dgram_accept (&uc->connection, listener->c_s_index,
121 listener->c_thread_index))
123 udp_connection_free (uc);
126 udp_connection_share_port (clib_net_to_host_u16
127 (uc->c_lcl_port), uc->c_is_ip4);
132 udp_connection_enqueue (udp_connection_t * uc0, session_t * s0,
133 session_dgram_hdr_t * hdr0, u32 thread_index,
134 vlib_buffer_t * b, u8 queue_event, u32 * error0)
138 clib_spinlock_lock (&uc0->rx_lock);
140 if (svm_fifo_max_enqueue_prod (s0->rx_fifo)
141 < hdr0->data_length + sizeof (session_dgram_hdr_t))
143 *error0 = UDP_ERROR_FIFO_FULL;
147 /* If session is owned by another thread and rx event needed,
148 * enqueue event now while we still have the peeker lock */
149 if (s0->thread_index != thread_index)
151 wrote0 = session_enqueue_dgram_connection (s0, hdr0, b,
153 /* queue event */ 0);
154 if (queue_event && !svm_fifo_has_event (s0->rx_fifo))
155 session_enqueue_notify (s0);
159 wrote0 = session_enqueue_dgram_connection (s0, hdr0, b,
167 clib_spinlock_unlock (&uc0->rx_lock);
170 always_inline session_t *
171 udp_parse_and_lookup_buffer (vlib_buffer_t * b, session_dgram_hdr_t * hdr,
178 /* udp_local hands us a pointer to the udp data */
179 udp = (udp_header_t *) (vlib_buffer_get_current (b) - sizeof (*udp));
180 fib_index = vnet_buffer (b)->ip.fib_index;
182 hdr->data_offset = 0;
183 hdr->lcl_port = udp->dst_port;
184 hdr->rmt_port = udp->src_port;
185 hdr->is_ip4 = is_ip4;
191 /* TODO: must fix once udp_local does ip options correctly */
192 ip4 = (ip4_header_t *) (((u8 *) udp) - sizeof (*ip4));
193 ip_set (&hdr->lcl_ip, &ip4->dst_address, 1);
194 ip_set (&hdr->rmt_ip, &ip4->src_address, 1);
195 hdr->data_length = clib_net_to_host_u16 (ip4->length);
196 hdr->data_length -= sizeof (ip4_header_t) + sizeof (udp_header_t);
197 s = session_lookup_safe4 (fib_index, &ip4->dst_address,
198 &ip4->src_address, udp->dst_port,
199 udp->src_port, TRANSPORT_PROTO_UDP);
205 ip60 = (ip6_header_t *) (((u8 *) udp) - sizeof (*ip60));
206 ip_set (&hdr->lcl_ip, &ip60->dst_address, 0);
207 ip_set (&hdr->rmt_ip, &ip60->src_address, 0);
208 hdr->data_length = clib_net_to_host_u16 (ip60->payload_length);
209 hdr->data_length -= sizeof (udp_header_t);
210 s = session_lookup_safe6 (fib_index, &ip60->dst_address,
211 &ip60->src_address, udp->dst_port,
212 udp->src_port, TRANSPORT_PROTO_UDP);
215 if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
216 b->current_length = hdr->data_length;
218 b->total_length_not_including_first_buffer = hdr->data_length
225 udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
226 vlib_frame_t * frame, u8 is_ip4)
228 u32 n_left_from, *from, errors, *first_buffer;
229 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
230 u16 err_counters[UDP_N_ERROR] = { 0 };
231 u32 thread_index = vm->thread_index;
233 from = first_buffer = vlib_frame_vector_args (frame);
234 n_left_from = frame->n_vectors;
235 vlib_get_buffers (vm, from, bufs, n_left_from);
239 while (n_left_from > 0)
241 u32 error0 = UDP_ERROR_ENQUEUED;
242 session_dgram_hdr_t hdr0;
243 udp_connection_t *uc0;
246 s0 = udp_parse_and_lookup_buffer (b[0], &hdr0, is_ip4);
247 if (PREDICT_FALSE (!s0))
249 error0 = UDP_ERROR_NO_LISTENER;
254 * If session exists pool peeker lock is taken at this point unless
255 * the session is already on the right thread or is a listener
258 if (s0->session_state == SESSION_STATE_OPENED)
261 uc0 = udp_connection_from_transport (session_get_transport (s0));
262 if (uc0->flags & UDP_CONN_F_CONNECTED)
264 if (s0->thread_index != thread_index)
267 * Clone the transport. It will be cleaned up with the
268 * session once we notify the session layer.
270 uc0 = udp_connection_clone_safe (s0->connection_index,
272 ASSERT (s0->session_index == uc0->c_s_index);
275 * Drop the peeker lock on pool resize and ask session
276 * layer for a new session.
278 session_pool_remove_peeker (s0->thread_index);
279 session_dgram_connect_notify (&uc0->connection,
280 s0->thread_index, &s0);
284 s0->session_state = SESSION_STATE_READY;
286 udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0],
287 queue_event, &error0);
288 session_pool_remove_peeker (s0->thread_index);
290 else if (s0->session_state == SESSION_STATE_READY)
292 uc0 = udp_connection_from_transport (session_get_transport (s0));
293 udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0], 1,
296 else if (s0->session_state == SESSION_STATE_LISTENING)
298 uc0 = udp_connection_from_transport (session_get_transport (s0));
299 if (uc0->flags & UDP_CONN_F_CONNECTED)
301 uc0 = udp_connection_accept (uc0, &hdr0, thread_index);
304 error0 = UDP_ERROR_CREATE_SESSION;
307 s0 = session_get (uc0->c_s_index, uc0->c_thread_index);
308 error0 = UDP_ERROR_ACCEPT;
310 udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0], 1,
315 error0 = UDP_ERROR_NOT_READY;
316 session_pool_remove_peeker (s0->thread_index);
320 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
321 udp_trace_buffer (vm, node, b[0], s0, error0);
326 udp_inc_err_counter (err_counters, error0, 1);
329 vlib_buffer_free (vm, first_buffer, frame->n_vectors);
330 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_UDP,
332 err_counters[UDP_ERROR_MQ_FULL] = errors;
333 udp_store_err_counters (vm, is_ip4, err_counters);
334 return frame->n_vectors;
338 udp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
339 vlib_frame_t * frame)
341 return udp46_input_inline (vm, node, frame, 1);
345 VLIB_REGISTER_NODE (udp4_input_node) =
347 .function = udp4_input,
348 .name = "udp4-input",
349 .vector_size = sizeof (u32),
350 .format_trace = format_udp_input_trace,
351 .type = VLIB_NODE_TYPE_INTERNAL,
352 .n_errors = ARRAY_LEN (udp_error_strings),
353 .error_strings = udp_error_strings,
354 .n_next_nodes = UDP_INPUT_N_NEXT,
356 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
357 foreach_udp_input_next
364 udp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
365 vlib_frame_t * frame)
367 return udp46_input_inline (vm, node, frame, 0);
371 VLIB_REGISTER_NODE (udp6_input_node) =
373 .function = udp6_input,
374 .name = "udp6-input",
375 .vector_size = sizeof (u32),
376 .format_trace = format_udp_input_trace,
377 .type = VLIB_NODE_TYPE_INTERNAL,
378 .n_errors = ARRAY_LEN (udp_error_strings),
379 .error_strings = udp_error_strings,
380 .n_next_nodes = UDP_INPUT_N_NEXT,
382 #define _(s, n) [UDP_INPUT_NEXT_##s] = n,
383 foreach_udp_input_next
390 * fd.io coding-style-patch-verification: ON
393 * eval: (c-set-style "gnu")