2 * Copyright (c) 2016-2020 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 <vnet/udp/udp.h>
17 #include <vnet/session/session.h>
18 #include <vnet/dpo/load_balance.h>
19 #include <vnet/ip/ip4_inlines.h>
20 #include <vnet/ip/ip6_inlines.h>
21 #include <vppinfra/sparse_vec.h>
26 udp_connection_register_port (vlib_main_t * vm, u16 lcl_port, u8 is_ip4)
28 udp_main_t *um = &udp_main;
29 udp_dst_port_info_t *pi;
32 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
35 udp_add_dst_port (um, lcl_port, 0, is_ip4);
36 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
37 pi->n_connections = 1;
41 pi->n_connections += 1;
42 /* Do not return. The fact that the pi is valid does not mean
46 pi->node_index = is_ip4 ? udp4_input_node.index : udp6_input_node.index;
47 pi->next_index = um->local_to_input_edge[is_ip4];
49 /* Setup udp protocol -> next index sparse vector mapping. */
51 n = sparse_vec_validate (um->next_by_dst_port4,
52 clib_host_to_net_u16 (lcl_port));
54 n = sparse_vec_validate (um->next_by_dst_port6,
55 clib_host_to_net_u16 (lcl_port));
57 n[0] = pi->next_index;
61 udp_connection_unregister_port (u16 lcl_port, u8 is_ip4)
63 udp_main_t *um = &udp_main;
64 udp_dst_port_info_t *pi;
66 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
70 if (!pi->n_connections)
72 clib_warning ("no connections using port %u", lcl_port);
76 if (!clib_atomic_sub_fetch (&pi->n_connections, 1))
77 udp_unregister_dst_port (0, lcl_port, is_ip4);
81 udp_connection_share_port (u16 lcl_port, u8 is_ip4)
83 udp_main_t *um = &udp_main;
84 udp_dst_port_info_t *pi;
86 /* Done without a lock but the operation is atomic. Writers to pi hash
87 * table and vector should be guarded by a barrier sync */
88 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
89 clib_atomic_fetch_add_rel (&pi->n_connections, 1);
93 udp_connection_alloc (u32 thread_index)
95 udp_main_t *um = &udp_main;
98 pool_get_aligned_will_expand (um->connections[thread_index], will_expand,
99 CLIB_CACHE_LINE_BYTES);
101 if (PREDICT_FALSE (will_expand))
103 clib_spinlock_lock_if_init (&udp_main.peekers_write_locks
105 pool_get_aligned (udp_main.connections[thread_index], uc,
106 CLIB_CACHE_LINE_BYTES);
107 clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
112 pool_get_aligned (um->connections[thread_index], uc,
113 CLIB_CACHE_LINE_BYTES);
115 clib_memset (uc, 0, sizeof (*uc));
116 uc->c_c_index = uc - um->connections[thread_index];
117 uc->c_thread_index = thread_index;
118 uc->c_proto = TRANSPORT_PROTO_UDP;
123 udp_connection_free (udp_connection_t * uc)
125 u32 thread_index = uc->c_thread_index;
126 clib_spinlock_free (&uc->rx_lock);
128 clib_memset (uc, 0xFA, sizeof (*uc));
129 pool_put (udp_main.connections[thread_index], uc);
133 udp_connection_cleanup (udp_connection_t * uc)
135 transport_endpoint_cleanup (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip,
137 udp_connection_unregister_port (clib_net_to_host_u16 (uc->c_lcl_port),
139 udp_connection_free (uc);
143 udp_connection_delete (udp_connection_t * uc)
145 session_transport_delete_notify (&uc->connection);
146 udp_connection_cleanup (uc);
150 udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4)
152 udp_main_t *um = vnet_get_udp_main ();
153 udp_dst_port_info_t *pi;
155 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
156 return (pi && !pi->n_connections
157 && udp_is_valid_dst_port (lcl_port, is_ip4));
161 udp_default_mtu (udp_main_t * um, u8 is_ip4)
163 u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
164 return (um->default_mtu - sizeof (udp_header_t) - ip_hlen);
168 udp_session_bind (u32 session_index, transport_endpoint_t * lcl)
170 udp_main_t *um = vnet_get_udp_main ();
171 vlib_main_t *vm = vlib_get_main ();
172 transport_endpoint_cfg_t *lcl_ext;
173 udp_connection_t *listener;
177 lcl_port_ho = clib_net_to_host_u16 (lcl->port);
179 if (udp_connection_port_used_extern (lcl_port_ho, lcl->is_ip4))
181 clib_warning ("port already used");
182 return SESSION_E_PORTINUSE;
185 pool_get (um->listener_pool, listener);
186 clib_memset (listener, 0, sizeof (udp_connection_t));
188 listener->c_lcl_port = lcl->port;
189 listener->c_c_index = listener - um->listener_pool;
191 /* If we are provided a sw_if_index, bind using one of its ips */
192 if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
194 if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
196 ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
198 ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
199 listener->c_is_ip4 = lcl->is_ip4;
200 listener->c_proto = TRANSPORT_PROTO_UDP;
201 listener->c_s_index = session_index;
202 listener->c_fib_index = lcl->fib_index;
203 listener->mss = udp_default_mtu (um, listener->c_is_ip4);
204 listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN;
205 lcl_ext = (transport_endpoint_cfg_t *) lcl;
206 if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED)
207 listener->flags |= UDP_CONN_F_CONNECTED;
209 listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
210 clib_spinlock_init (&listener->rx_lock);
212 udp_connection_register_port (vm, lcl_port_ho, lcl->is_ip4);
213 return listener->c_c_index;
217 udp_session_unbind (u32 listener_index)
219 udp_main_t *um = &udp_main;
220 udp_connection_t *listener;
222 listener = udp_listener_get (listener_index);
223 udp_connection_unregister_port (clib_net_to_host_u16 (listener->c_lcl_port),
225 clib_spinlock_free (&listener->rx_lock);
226 pool_put (um->listener_pool, listener);
230 static transport_connection_t *
231 udp_session_get_listener (u32 listener_index)
233 udp_connection_t *us;
235 us = udp_listener_get (listener_index);
236 return &us->connection;
240 udp_push_header (transport_connection_t * tc, vlib_buffer_t * b)
242 udp_connection_t *uc;
243 vlib_main_t *vm = vlib_get_main ();
245 uc = udp_connection_from_transport (tc);
247 vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1);
249 vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
250 IP_PROTOCOL_UDP, 1 /* csum offload */ ,
253 vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
255 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
256 vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
257 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
259 if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
261 if (!transport_max_tx_dequeue (&uc->connection))
262 udp_connection_delete (uc);
268 static transport_connection_t *
269 udp_session_get (u32 connection_index, u32 thread_index)
271 udp_connection_t *uc;
272 uc = udp_connection_get (connection_index, thread_index);
274 return &uc->connection;
279 udp_session_close (u32 connection_index, u32 thread_index)
281 udp_connection_t *uc;
283 uc = udp_connection_get (connection_index, thread_index);
287 if (!transport_max_tx_dequeue (&uc->connection))
288 udp_connection_delete (uc);
290 uc->flags |= UDP_CONN_F_CLOSING;
294 udp_session_cleanup (u32 connection_index, u32 thread_index)
296 udp_connection_t *uc;
297 uc = udp_connection_get (connection_index, thread_index);
300 if (uc->flags & UDP_CONN_F_MIGRATED)
301 udp_connection_free (uc);
303 udp_connection_cleanup (uc);
307 udp_session_send_params (transport_connection_t * tconn,
308 transport_send_params_t * sp)
310 udp_connection_t *uc;
312 uc = udp_connection_from_transport (tconn);
314 /* No constraint on TX window */
316 /* TODO figure out MTU of output interface */
317 sp->snd_mss = uc->mss;
324 udp_open_connection (transport_endpoint_cfg_t * rmt)
326 vlib_main_t *vm = vlib_get_main ();
327 u32 thread_index = vm->thread_index;
328 udp_main_t *um = &udp_main;
329 ip46_address_t lcl_addr;
330 udp_connection_t *uc;
334 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
338 if (rv != SESSION_E_PORTINUSE)
341 if (udp_connection_port_used_extern (lcl_port, rmt->is_ip4))
342 return SESSION_E_PORTINUSE;
344 /* If port in use, check if 5-tuple is also in use */
345 if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
346 lcl_port, rmt->port, TRANSPORT_PROTO_UDP,
348 return SESSION_E_PORTINUSE;
350 /* 5-tuple is available so increase lcl endpoint refcount and proceed
351 * with connection allocation */
352 transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
357 if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
359 /* If specific source port was requested abort */
361 return SESSION_E_PORTINUSE;
363 /* Try to find a port that's not used */
364 while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
366 lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP,
369 return SESSION_E_PORTINUSE;
375 udp_connection_register_port (vm, lcl_port, rmt->is_ip4);
377 /* We don't poll main thread if we have workers */
378 if (vlib_num_workers ())
381 uc = udp_connection_alloc (thread_index);
382 ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
383 ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
384 uc->c_rmt_port = rmt->port;
385 uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
386 uc->c_is_ip4 = rmt->is_ip4;
387 uc->c_proto = TRANSPORT_PROTO_UDP;
388 uc->c_fib_index = rmt->fib_index;
389 uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4);
390 uc->flags |= UDP_CONN_F_OWNS_PORT;
391 if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED)
393 uc->flags |= UDP_CONN_F_CONNECTED;
397 clib_spinlock_init (&uc->rx_lock);
398 uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
401 return uc->c_c_index;
404 static transport_connection_t *
405 udp_session_get_half_open (u32 conn_index)
407 udp_connection_t *uc;
410 /* We don't poll main thread if we have workers */
411 thread_index = vlib_num_workers ()? 1 : 0;
412 uc = udp_connection_get (conn_index, thread_index);
415 return &uc->connection;
419 format_udp_session (u8 * s, va_list * args)
421 u32 uci = va_arg (*args, u32);
422 u32 thread_index = va_arg (*args, u32);
423 u32 verbose = va_arg (*args, u32);
424 udp_connection_t *uc;
426 uc = udp_connection_get (uci, thread_index);
427 return format (s, "%U", format_udp_connection, uc, verbose);
431 format_udp_half_open_session (u8 * s, va_list * args)
433 u32 __clib_unused tci = va_arg (*args, u32);
434 u32 __clib_unused thread_index = va_arg (*args, u32);
435 clib_warning ("BUG");
440 format_udp_listener_session (u8 * s, va_list * args)
442 u32 tci = va_arg (*args, u32);
443 u32 __clib_unused thread_index = va_arg (*args, u32);
444 u32 verbose = va_arg (*args, u32);
445 udp_connection_t *uc = udp_listener_get (tci);
446 return format (s, "%U", format_udp_connection, uc, verbose);
450 static const transport_proto_vft_t udp_proto = {
451 .start_listen = udp_session_bind,
452 .connect = udp_open_connection,
453 .stop_listen = udp_session_unbind,
454 .push_header = udp_push_header,
455 .get_connection = udp_session_get,
456 .get_listener = udp_session_get_listener,
457 .get_half_open = udp_session_get_half_open,
458 .close = udp_session_close,
459 .cleanup = udp_session_cleanup,
460 .send_params = udp_session_send_params,
461 .format_connection = format_udp_session,
462 .format_half_open = format_udp_half_open_session,
463 .format_listener = format_udp_listener_session,
464 .transport_options = {
467 .tx_type = TRANSPORT_TX_DGRAM,
468 .service_type = TRANSPORT_SERVICE_CL,
473 static clib_error_t *
474 udp_init (vlib_main_t * vm)
476 udp_main_t *um = vnet_get_udp_main ();
477 ip_main_t *im = &ip_main;
478 vlib_thread_main_t *tm = vlib_get_thread_main ();
480 ip_protocol_info_t *pi;
487 /* IP registration */
488 pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
490 return clib_error_return (0, "UDP protocol info AWOL");
491 pi->format_header = format_udp_header;
492 pi->unformat_pg_edit = unformat_pg_udp_header;
494 /* Register as transport with URI */
495 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
496 FIB_PROTOCOL_IP4, ip4_lookup_node.index);
497 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
498 FIB_PROTOCOL_IP6, ip6_lookup_node.index);
501 * Initialize data structures
504 num_threads = 1 /* main thread */ + tm->n_threads;
505 vec_validate (um->connections, num_threads - 1);
506 vec_validate (um->connection_peekers, num_threads - 1);
507 vec_validate (um->peekers_readers_locks, num_threads - 1);
508 vec_validate (um->peekers_write_locks, num_threads - 1);
511 for (i = 0; i < num_threads; i++)
513 clib_spinlock_init (&um->peekers_readers_locks[i]);
514 clib_spinlock_init (&um->peekers_write_locks[i]);
517 um->local_to_input_edge[UDP_IP4] =
518 vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
519 um->local_to_input_edge[UDP_IP6] =
520 vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);
522 um->default_mtu = 1500;
527 VLIB_INIT_FUNCTION (udp_init) =
529 .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init",
535 * fd.io coding-style-patch-verification: ON
538 * eval: (c-set-style "gnu")