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;
97 u32 will_expand = pool_get_will_expand (um->connections[thread_index]);
99 if (PREDICT_FALSE (will_expand))
101 clib_spinlock_lock_if_init (&udp_main.peekers_write_locks
103 pool_get_aligned (udp_main.connections[thread_index], uc,
104 CLIB_CACHE_LINE_BYTES);
105 clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
110 pool_get_aligned (um->connections[thread_index], uc,
111 CLIB_CACHE_LINE_BYTES);
113 clib_memset (uc, 0, sizeof (*uc));
114 uc->c_c_index = uc - um->connections[thread_index];
115 uc->c_thread_index = thread_index;
116 uc->c_proto = TRANSPORT_PROTO_UDP;
121 udp_connection_free (udp_connection_t * uc)
123 u32 thread_index = uc->c_thread_index;
124 clib_spinlock_free (&uc->rx_lock);
126 clib_memset (uc, 0xFA, sizeof (*uc));
127 pool_put (udp_main.connections[thread_index], uc);
131 udp_connection_cleanup (udp_connection_t * uc)
133 transport_endpoint_cleanup (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip,
135 udp_connection_unregister_port (clib_net_to_host_u16 (uc->c_lcl_port),
137 udp_connection_free (uc);
141 udp_connection_delete (udp_connection_t * uc)
143 session_transport_delete_notify (&uc->connection);
144 udp_connection_cleanup (uc);
148 udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4)
150 udp_main_t *um = vnet_get_udp_main ();
151 udp_dst_port_info_t *pi;
153 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
154 return (pi && !pi->n_connections
155 && udp_is_valid_dst_port (lcl_port, is_ip4));
159 udp_default_mtu (udp_main_t * um, u8 is_ip4)
161 u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
162 return (um->default_mtu - sizeof (udp_header_t) - ip_hlen);
166 udp_session_bind (u32 session_index, transport_endpoint_cfg_t *lcl)
168 udp_main_t *um = vnet_get_udp_main ();
169 vlib_main_t *vm = vlib_get_main ();
170 transport_endpoint_cfg_t *lcl_ext;
171 udp_connection_t *listener;
175 lcl_port_ho = clib_net_to_host_u16 (lcl->port);
177 if (udp_connection_port_used_extern (lcl_port_ho, lcl->is_ip4))
179 clib_warning ("port already used");
180 return SESSION_E_PORTINUSE;
183 pool_get (um->listener_pool, listener);
184 clib_memset (listener, 0, sizeof (udp_connection_t));
186 listener->c_lcl_port = lcl->port;
187 listener->c_c_index = listener - um->listener_pool;
189 /* If we are provided a sw_if_index, bind using one of its ips */
190 if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
192 if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
194 ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
196 ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
197 listener->c_is_ip4 = lcl->is_ip4;
198 listener->c_proto = TRANSPORT_PROTO_UDP;
199 listener->c_s_index = session_index;
200 listener->c_fib_index = lcl->fib_index;
201 listener->mss = udp_default_mtu (um, listener->c_is_ip4);
202 listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN;
203 lcl_ext = (transport_endpoint_cfg_t *) lcl;
204 if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED)
205 listener->flags |= UDP_CONN_F_CONNECTED;
207 listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
208 clib_spinlock_init (&listener->rx_lock);
210 udp_connection_register_port (vm, lcl_port_ho, lcl->is_ip4);
211 return listener->c_c_index;
215 udp_session_unbind (u32 listener_index)
217 udp_main_t *um = &udp_main;
218 udp_connection_t *listener;
220 listener = udp_listener_get (listener_index);
221 udp_connection_unregister_port (clib_net_to_host_u16 (listener->c_lcl_port),
223 clib_spinlock_free (&listener->rx_lock);
224 pool_put (um->listener_pool, listener);
228 static transport_connection_t *
229 udp_session_get_listener (u32 listener_index)
231 udp_connection_t *us;
233 us = udp_listener_get (listener_index);
234 return &us->connection;
238 udp_push_one_header (vlib_main_t *vm, udp_connection_t *uc, vlib_buffer_t *b)
240 vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1);
242 vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
243 IP_PROTOCOL_UDP, 1 /* csum offload */,
244 0 /* is_df */, uc->c_dscp);
246 vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
248 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
249 vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
250 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
256 udp_push_header (transport_connection_t *tc, vlib_buffer_t **bs, u32 n_bufs)
258 vlib_main_t *vm = vlib_get_main ();
259 udp_connection_t *uc;
261 uc = udp_connection_from_transport (tc);
265 vlib_prefetch_buffer_header (bs[2], STORE);
266 vlib_prefetch_buffer_header (bs[3], STORE);
268 udp_push_one_header (vm, uc, bs[0]);
269 udp_push_one_header (vm, uc, bs[1]);
277 vlib_prefetch_buffer_header (bs[1], STORE);
279 udp_push_one_header (vm, uc, bs[0]);
285 if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
287 if (!transport_max_tx_dequeue (&uc->connection))
288 udp_connection_delete (uc);
294 static transport_connection_t *
295 udp_session_get (u32 connection_index, u32 thread_index)
297 udp_connection_t *uc;
298 uc = udp_connection_get (connection_index, thread_index);
300 return &uc->connection;
305 udp_session_close (u32 connection_index, u32 thread_index)
307 udp_connection_t *uc;
309 uc = udp_connection_get (connection_index, thread_index);
310 if (!uc || (uc->flags & UDP_CONN_F_MIGRATED))
313 if (!transport_max_tx_dequeue (&uc->connection))
314 udp_connection_delete (uc);
316 uc->flags |= UDP_CONN_F_CLOSING;
320 udp_session_cleanup (u32 connection_index, u32 thread_index)
322 udp_connection_t *uc;
323 uc = udp_connection_get (connection_index, thread_index);
326 if (uc->flags & UDP_CONN_F_MIGRATED)
327 udp_connection_free (uc);
329 udp_connection_cleanup (uc);
333 udp_session_send_params (transport_connection_t * tconn,
334 transport_send_params_t * sp)
336 udp_connection_t *uc;
338 uc = udp_connection_from_transport (tconn);
340 /* No constraint on TX window */
342 /* TODO figure out MTU of output interface */
343 sp->snd_mss = uc->mss;
350 udp_open_connection (transport_endpoint_cfg_t * rmt)
352 vlib_main_t *vm = vlib_get_main ();
353 u32 thread_index = vm->thread_index;
354 udp_main_t *um = &udp_main;
355 ip46_address_t lcl_addr;
356 udp_connection_t *uc;
360 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
364 if (rv != SESSION_E_PORTINUSE)
367 if (udp_connection_port_used_extern (lcl_port, rmt->is_ip4))
368 return SESSION_E_PORTINUSE;
370 /* If port in use, check if 5-tuple is also in use */
371 if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
372 lcl_port, rmt->port, TRANSPORT_PROTO_UDP,
374 return SESSION_E_PORTINUSE;
376 /* 5-tuple is available so increase lcl endpoint refcount and proceed
377 * with connection allocation */
378 transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
383 if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
385 /* If specific source port was requested abort */
387 return SESSION_E_PORTINUSE;
389 /* Try to find a port that's not used */
390 while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
392 lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP,
395 return SESSION_E_PORTINUSE;
401 udp_connection_register_port (vm, lcl_port, rmt->is_ip4);
403 /* We don't poll main thread if we have workers */
404 thread_index = transport_cl_thread ();
406 uc = udp_connection_alloc (thread_index);
407 ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
408 ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
409 uc->c_rmt_port = rmt->port;
410 uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
411 uc->c_is_ip4 = rmt->is_ip4;
412 uc->c_proto = TRANSPORT_PROTO_UDP;
413 uc->c_fib_index = rmt->fib_index;
414 uc->c_dscp = rmt->dscp;
415 uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4);
416 uc->flags |= UDP_CONN_F_OWNS_PORT;
417 if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED)
419 uc->flags |= UDP_CONN_F_CONNECTED;
423 clib_spinlock_init (&uc->rx_lock);
424 uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
427 return uc->c_c_index;
430 static transport_connection_t *
431 udp_session_get_half_open (u32 conn_index)
433 udp_connection_t *uc;
436 /* We don't poll main thread if we have workers */
437 thread_index = transport_cl_thread ();
438 uc = udp_connection_get (conn_index, thread_index);
441 return &uc->connection;
445 format_udp_session (u8 * s, va_list * args)
447 u32 uci = va_arg (*args, u32);
448 u32 thread_index = va_arg (*args, u32);
449 u32 verbose = va_arg (*args, u32);
450 udp_connection_t *uc;
452 uc = udp_connection_get (uci, thread_index);
453 return format (s, "%U", format_udp_connection, uc, verbose);
457 format_udp_half_open_session (u8 * s, va_list * args)
459 u32 __clib_unused tci = va_arg (*args, u32);
460 u32 __clib_unused thread_index = va_arg (*args, u32);
461 clib_warning ("BUG");
466 format_udp_listener_session (u8 * s, va_list * args)
468 u32 tci = va_arg (*args, u32);
469 u32 __clib_unused thread_index = va_arg (*args, u32);
470 u32 verbose = va_arg (*args, u32);
471 udp_connection_t *uc = udp_listener_get (tci);
472 return format (s, "%U", format_udp_connection, uc, verbose);
476 static const transport_proto_vft_t udp_proto = {
477 .start_listen = udp_session_bind,
478 .connect = udp_open_connection,
479 .stop_listen = udp_session_unbind,
480 .push_header = udp_push_header,
481 .get_connection = udp_session_get,
482 .get_listener = udp_session_get_listener,
483 .get_half_open = udp_session_get_half_open,
484 .close = udp_session_close,
485 .cleanup = udp_session_cleanup,
486 .send_params = udp_session_send_params,
487 .format_connection = format_udp_session,
488 .format_half_open = format_udp_half_open_session,
489 .format_listener = format_udp_listener_session,
490 .transport_options = {
493 .tx_type = TRANSPORT_TX_DGRAM,
494 .service_type = TRANSPORT_SERVICE_CL,
499 static clib_error_t *
500 udp_init (vlib_main_t * vm)
502 udp_main_t *um = vnet_get_udp_main ();
503 ip_main_t *im = &ip_main;
504 vlib_thread_main_t *tm = vlib_get_thread_main ();
506 ip_protocol_info_t *pi;
513 /* IP registration */
514 pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
516 return clib_error_return (0, "UDP protocol info AWOL");
517 pi->format_header = format_udp_header;
518 pi->unformat_pg_edit = unformat_pg_udp_header;
520 /* Register as transport with URI */
521 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
522 FIB_PROTOCOL_IP4, ip4_lookup_node.index);
523 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
524 FIB_PROTOCOL_IP6, ip6_lookup_node.index);
527 * Initialize data structures
530 num_threads = 1 /* main thread */ + tm->n_threads;
531 vec_validate (um->connections, num_threads - 1);
532 vec_validate (um->connection_peekers, num_threads - 1);
533 vec_validate (um->peekers_readers_locks, num_threads - 1);
534 vec_validate (um->peekers_write_locks, num_threads - 1);
537 for (i = 0; i < num_threads; i++)
539 clib_spinlock_init (&um->peekers_readers_locks[i]);
540 clib_spinlock_init (&um->peekers_write_locks[i]);
543 um->local_to_input_edge[UDP_IP4] =
544 vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
545 um->local_to_input_edge[UDP_IP6] =
546 vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);
548 um->default_mtu = 1500;
553 VLIB_INIT_FUNCTION (udp_init) =
555 .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init",
561 * fd.io coding-style-patch-verification: ON
564 * eval: (c-set-style "gnu")