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 (u16 lcl_port, u8 is_ip4)
28 udp_main_t *um = &udp_main;
31 /* Setup udp protocol -> next index sparse vector mapping. Do not setup
32 * udp_dst_port_info_t as that is used to distinguish between external
33 * and transport consumed ports */
36 n = sparse_vec_validate (um->next_by_dst_port4, lcl_port);
38 n = sparse_vec_validate (um->next_by_dst_port6, lcl_port);
40 n[0] = um->local_to_input_edge[is_ip4];
42 __atomic_add_fetch (&um->transport_ports_refcnt[is_ip4][lcl_port], 1,
47 udp_connection_unregister_port (u16 lcl_port, u8 is_ip4)
49 udp_main_t *um = &udp_main;
52 /* Needed because listeners are not tracked as local endpoints */
53 if (__atomic_sub_fetch (&um->transport_ports_refcnt[is_ip4][lcl_port], 1,
58 n = sparse_vec_validate (um->next_by_dst_port4, lcl_port);
60 n = sparse_vec_validate (um->next_by_dst_port6, lcl_port);
62 n[0] = UDP_NO_NODE_SET;
66 udp_connection_alloc (u32 thread_index)
68 udp_worker_t *wrk = udp_worker_get (thread_index);
71 pool_get_aligned_safe (wrk->connections, uc, CLIB_CACHE_LINE_BYTES);
73 clib_memset (uc, 0, sizeof (*uc));
74 uc->c_c_index = uc - wrk->connections;
75 uc->c_thread_index = thread_index;
76 uc->c_proto = TRANSPORT_PROTO_UDP;
81 udp_connection_free (udp_connection_t * uc)
83 udp_worker_t *wrk = udp_worker_get (uc->c_thread_index);
85 clib_spinlock_free (&uc->rx_lock);
87 clib_memset (uc, 0xFA, sizeof (*uc));
88 pool_put (wrk->connections, uc);
92 udp_connection_cleanup (udp_connection_t * uc)
94 /* Unregister port from udp_local only if refcount went to zero */
95 if (!transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip,
97 udp_connection_unregister_port (uc->c_lcl_port, uc->c_is_ip4);
98 udp_connection_free (uc);
102 udp_connection_delete (udp_connection_t * uc)
104 session_transport_delete_notify (&uc->connection);
105 udp_connection_cleanup (uc);
109 udp_handle_cleanups (void *args)
111 u32 thread_index = (u32) pointer_to_uword (args);
112 udp_connection_t *uc;
116 wrk = udp_worker_get (thread_index);
117 vec_foreach (uc_index, wrk->pending_cleanups)
119 uc = udp_connection_get (*uc_index, thread_index);
120 udp_connection_delete (uc);
122 vec_reset_length (wrk->pending_cleanups);
126 udp_connection_program_cleanup (udp_connection_t *uc)
128 uword thread_index = uc->c_thread_index;
131 wrk = udp_worker_get (uc->c_thread_index);
132 vec_add1 (wrk->pending_cleanups, uc->c_c_index);
134 if (vec_len (wrk->pending_cleanups) == 1)
135 session_send_rpc_evt_to_thread_force (
136 thread_index, udp_handle_cleanups,
137 uword_to_pointer (thread_index, void *));
141 udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4)
143 udp_main_t *um = vnet_get_udp_main ();
144 udp_dst_port_info_t *pi;
146 pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
147 return (pi && udp_is_valid_dst_port (lcl_port, is_ip4));
151 udp_default_mtu (udp_main_t * um, u8 is_ip4)
153 u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
154 return (um->default_mtu - sizeof (udp_header_t) - ip_hlen);
158 udp_session_bind (u32 session_index, transport_endpoint_cfg_t *lcl)
160 udp_main_t *um = vnet_get_udp_main ();
161 transport_endpoint_cfg_t *lcl_ext;
162 udp_connection_t *listener;
165 if (udp_connection_port_used_extern (clib_net_to_host_u16 (lcl->port),
168 clib_warning ("port already used");
169 return SESSION_E_PORTINUSE;
172 pool_get (um->listener_pool, listener);
173 clib_memset (listener, 0, sizeof (udp_connection_t));
175 listener->c_lcl_port = lcl->port;
176 listener->c_c_index = listener - um->listener_pool;
178 /* If we are provided a sw_if_index, bind using one of its ips */
179 if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
181 if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
183 ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
185 ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
186 listener->c_is_ip4 = lcl->is_ip4;
187 listener->c_proto = TRANSPORT_PROTO_UDP;
188 listener->c_s_index = session_index;
189 listener->c_fib_index = lcl->fib_index;
191 lcl->mss ? lcl->mss : udp_default_mtu (um, listener->c_is_ip4);
192 listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN;
193 lcl_ext = (transport_endpoint_cfg_t *) lcl;
194 if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED)
195 listener->flags |= UDP_CONN_F_CONNECTED;
197 listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
198 clib_spinlock_init (&listener->rx_lock);
199 if (!um->csum_offload)
200 listener->cfg_flags |= UDP_CFG_F_NO_CSUM_OFFLOAD;
202 udp_connection_register_port (listener->c_lcl_port, lcl->is_ip4);
203 return listener->c_c_index;
207 udp_session_unbind (u32 listener_index)
209 udp_main_t *um = &udp_main;
210 udp_connection_t *listener;
212 listener = udp_listener_get (listener_index);
213 udp_connection_unregister_port (listener->c_lcl_port, listener->c_is_ip4);
214 clib_spinlock_free (&listener->rx_lock);
215 pool_put (um->listener_pool, listener);
219 static transport_connection_t *
220 udp_session_get_listener (u32 listener_index)
222 udp_connection_t *us;
224 us = udp_listener_get (listener_index);
225 return &us->connection;
229 udp_push_one_header (vlib_main_t *vm, udp_connection_t *uc, vlib_buffer_t *b)
231 vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port,
232 udp_csum_offload (uc));
233 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
235 /* Handle ip header now as session layer overwrite connection details for
236 * non-connected udp. */
238 vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
239 IP_PROTOCOL_UDP, udp_csum_offload (uc),
240 0 /* is_df */, uc->c_dscp);
242 vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
245 /* reuse tcp medatada for now */
246 vnet_buffer (b)->tcp.connection_index = uc->c_c_index;
248 /* Not connected udp session. Mark buffer for custom handling in
250 if (PREDICT_FALSE (!(uc->flags & UDP_CONN_F_CONNECTED)))
251 vnet_buffer (b)->tcp.flags |= UDP_CONN_F_LISTEN;
253 vnet_buffer (b)->tcp.flags = 0;
259 udp_push_header (transport_connection_t *tc, vlib_buffer_t **bs, u32 n_bufs)
261 vlib_main_t *vm = vlib_get_main ();
262 udp_connection_t *uc;
264 uc = udp_connection_from_transport (tc);
268 vlib_prefetch_buffer_header (bs[2], STORE);
269 vlib_prefetch_buffer_header (bs[3], STORE);
271 udp_push_one_header (vm, uc, bs[0]);
272 udp_push_one_header (vm, uc, bs[1]);
280 vlib_prefetch_buffer_header (bs[1], STORE);
282 udp_push_one_header (vm, uc, bs[0]);
288 if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
290 if (!transport_max_tx_dequeue (&uc->connection))
291 udp_connection_program_cleanup (uc);
297 static transport_connection_t *
298 udp_session_get (u32 connection_index, u32 thread_index)
300 udp_connection_t *uc;
301 uc = udp_connection_get (connection_index, thread_index);
303 return &uc->connection;
308 udp_session_close (u32 connection_index, u32 thread_index)
310 udp_connection_t *uc;
312 uc = udp_connection_get (connection_index, thread_index);
313 if (!uc || (uc->flags & UDP_CONN_F_MIGRATED))
316 if (!transport_max_tx_dequeue (&uc->connection))
317 udp_connection_program_cleanup (uc);
319 uc->flags |= UDP_CONN_F_CLOSING;
323 udp_session_cleanup (u32 connection_index, u32 thread_index)
325 udp_connection_t *uc;
326 uc = udp_connection_get (connection_index, thread_index);
329 if (uc->flags & UDP_CONN_F_MIGRATED)
330 udp_connection_free (uc);
332 udp_connection_cleanup (uc);
336 udp_session_send_params (transport_connection_t * tconn,
337 transport_send_params_t * sp)
339 udp_connection_t *uc;
341 uc = udp_connection_from_transport (tconn);
343 /* No constraint on TX window */
345 /* TODO figure out MTU of output interface */
346 sp->snd_mss = uc->mss;
353 udp_open_connection (transport_endpoint_cfg_t * rmt)
355 udp_main_t *um = &udp_main;
356 ip46_address_t lcl_addr;
357 udp_connection_t *uc;
362 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
367 if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
369 /* If specific source port was requested abort */
372 transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
374 return SESSION_E_PORTINUSE;
377 /* Try to find a port that's not used */
378 while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
380 transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
383 transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr, rmt);
385 return SESSION_E_PORTINUSE;
389 /* We don't poll main thread if we have workers */
390 thread_index = transport_cl_thread ();
392 uc = udp_connection_alloc (thread_index);
393 ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
394 ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
395 uc->c_rmt_port = rmt->port;
396 uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
397 uc->c_is_ip4 = rmt->is_ip4;
398 uc->c_proto = TRANSPORT_PROTO_UDP;
399 uc->c_fib_index = rmt->fib_index;
400 uc->c_dscp = rmt->dscp;
401 uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4);
402 if (rmt->peer.sw_if_index != ENDPOINT_INVALID_INDEX)
403 uc->sw_if_index = rmt->peer.sw_if_index;
404 uc->flags |= UDP_CONN_F_OWNS_PORT;
405 if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED)
407 uc->flags |= UDP_CONN_F_CONNECTED;
411 clib_spinlock_init (&uc->rx_lock);
412 uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
414 if (!um->csum_offload)
415 uc->cfg_flags |= UDP_CFG_F_NO_CSUM_OFFLOAD;
416 uc->next_node_index = rmt->next_node_index;
417 uc->next_node_opaque = rmt->next_node_opaque;
419 udp_connection_register_port (uc->c_lcl_port, rmt->is_ip4);
421 return uc->c_c_index;
424 static transport_connection_t *
425 udp_session_get_half_open (u32 conn_index)
427 udp_connection_t *uc;
430 /* We don't poll main thread if we have workers */
431 thread_index = transport_cl_thread ();
432 uc = udp_connection_get (conn_index, thread_index);
435 return &uc->connection;
439 format_udp_session (u8 * s, va_list * args)
441 u32 uci = va_arg (*args, u32);
442 u32 thread_index = va_arg (*args, u32);
443 u32 verbose = va_arg (*args, u32);
444 udp_connection_t *uc;
446 uc = udp_connection_get (uci, thread_index);
447 return format (s, "%U", format_udp_connection, uc, verbose);
451 format_udp_half_open_session (u8 * s, va_list * args)
453 u32 __clib_unused tci = va_arg (*args, u32);
454 u32 __clib_unused thread_index = va_arg (*args, u32);
455 clib_warning ("BUG");
460 format_udp_listener_session (u8 * s, va_list * args)
462 u32 tci = va_arg (*args, u32);
463 u32 __clib_unused thread_index = va_arg (*args, u32);
464 u32 verbose = va_arg (*args, u32);
465 udp_connection_t *uc = udp_listener_get (tci);
466 return format (s, "%U", format_udp_connection, uc, verbose);
470 udp_realloc_ports_sv (u16 **ports_nh_svp)
472 u16 port, port_no, *ports_nh_sv, *mc;
473 u32 *ports = 0, *nh = 0, msum, i;
474 sparse_vec_header_t *h;
477 ports_nh_sv = *ports_nh_svp;
479 for (port = 1; port < 65535; port++)
481 port_no = clib_host_to_net_u16 (port);
483 sv_index = sparse_vec_index (ports_nh_sv, port_no);
484 if (sv_index != SPARSE_VEC_INVALID_INDEX)
486 vec_add1 (ports, port_no);
487 vec_add1 (nh, ports_nh_sv[sv_index]);
491 sparse_vec_free (ports_nh_sv);
494 sparse_vec_new (/* elt bytes */ sizeof (ports_nh_sv[0]),
495 /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
497 vec_resize (ports_nh_sv, 65535);
499 for (port = 1; port < 65535; port++)
500 ports_nh_sv[port] = UDP_NO_NODE_SET;
502 for (i = 0; i < vec_len (ports); i++)
503 ports_nh_sv[ports[i]] = nh[i];
505 h = sparse_vec_header (ports_nh_sv);
506 vec_foreach (mb, h->is_member_bitmap)
510 vec_foreach (mc, h->member_counts)
513 msum += msum == 0 ? 63 : 64;
519 *ports_nh_svp = ports_nh_sv;
522 static clib_error_t *
523 udp_enable_disable (vlib_main_t *vm, u8 is_en)
525 udp_main_t *um = &udp_main;
527 /* Not ideal. The sparse vector used to map ports to next nodes assumes
528 * only a few ports are ever used. When udp transport is enabled this does
529 * not hold and, to make matters worse, ports are consumed in a random
532 * This can lead to a lot of slow updates to internal data structures
533 * which in turn can slow udp connection allocations until all ports are
534 * eventually consumed.
536 * Consequently, reallocate sparse vector, preallocate all ports and have
537 * them point to UDP_NO_NODE_SET. We could consider switching the sparse
538 * vector to a preallocated vector but that would increase memory
539 * consumption for vpp deployments that do not rely on host stack.
542 udp_realloc_ports_sv (&um->next_by_dst_port4);
543 udp_realloc_ports_sv (&um->next_by_dst_port6);
545 vec_validate (um->transport_ports_refcnt[0], 65535);
546 vec_validate (um->transport_ports_refcnt[1], 65535);
551 static const transport_proto_vft_t udp_proto = {
552 .enable = udp_enable_disable,
553 .start_listen = udp_session_bind,
554 .connect = udp_open_connection,
555 .stop_listen = udp_session_unbind,
556 .push_header = udp_push_header,
557 .get_connection = udp_session_get,
558 .get_listener = udp_session_get_listener,
559 .get_half_open = udp_session_get_half_open,
560 .close = udp_session_close,
561 .cleanup = udp_session_cleanup,
562 .send_params = udp_session_send_params,
563 .format_connection = format_udp_session,
564 .format_half_open = format_udp_half_open_session,
565 .format_listener = format_udp_listener_session,
566 .transport_options = {
569 .tx_type = TRANSPORT_TX_DGRAM,
570 .service_type = TRANSPORT_SERVICE_CL,
574 static clib_error_t *
575 udp_init (vlib_main_t * vm)
577 udp_main_t *um = vnet_get_udp_main ();
578 ip_main_t *im = &ip_main;
579 vlib_thread_main_t *tm = vlib_get_thread_main ();
581 ip_protocol_info_t *pi;
587 /* IP registration */
588 pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
590 return clib_error_return (0, "UDP protocol info AWOL");
591 pi->format_header = format_udp_header;
592 pi->unformat_pg_edit = unformat_pg_udp_header;
594 /* Register as transport with session layer */
595 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
596 FIB_PROTOCOL_IP4, udp4_output_node.index);
597 transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
598 FIB_PROTOCOL_IP6, udp6_output_node.index);
601 * Initialize data structures
604 num_threads = 1 /* main thread */ + tm->n_threads;
605 vec_validate (um->wrk, num_threads - 1);
607 um->local_to_input_edge[UDP_IP4] =
608 vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
609 um->local_to_input_edge[UDP_IP6] =
610 vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);
612 um->default_mtu = 1500;
613 um->csum_offload = 1;
618 VLIB_INIT_FUNCTION (udp_init) =
620 .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init",
626 * fd.io coding-style-patch-verification: ON
629 * eval: (c-set-style "gnu")