/* * Copyright (c) 2016-2020 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <vnet/udp/udp.h> #include <vnet/session/session.h> #include <vnet/dpo/load_balance.h> #include <vnet/ip/ip4_inlines.h> #include <vnet/ip/ip6_inlines.h> #include <vppinfra/sparse_vec.h> udp_main_t udp_main; static void udp_connection_register_port (u16 lcl_port, u8 is_ip4) { udp_main_t *um = &udp_main; udp_dst_port_info_t *pi; u16 *n; pi = udp_get_dst_port_info (um, lcl_port, is_ip4); if (!pi) { udp_add_dst_port (um, lcl_port, 0, is_ip4); pi = udp_get_dst_port_info (um, lcl_port, is_ip4); pi->n_connections = 1; } else { pi->n_connections += 1; /* Do not return. The fact that the pi is valid does not mean * it's up to date */ } pi->node_index = is_ip4 ? udp4_input_node.index : udp6_input_node.index; pi->next_index = um->local_to_input_edge[is_ip4]; /* Setup udp protocol -> next index sparse vector mapping. */ if (is_ip4) n = sparse_vec_validate (um->next_by_dst_port4, clib_host_to_net_u16 (lcl_port)); else n = sparse_vec_validate (um->next_by_dst_port6, clib_host_to_net_u16 (lcl_port)); n[0] = pi->next_index; } static void udp_connection_unregister_port (u16 lcl_port, u8 is_ip4) { udp_main_t *um = &udp_main; udp_dst_port_info_t *pi; pi = udp_get_dst_port_info (um, lcl_port, is_ip4); if (!pi) return; if (!pi->n_connections) { clib_warning ("no connections using port %u", lcl_port); return; } if (!clib_atomic_sub_fetch (&pi->n_connections, 1)) udp_unregister_dst_port (0, lcl_port, is_ip4); } void udp_connection_share_port (u16 lcl_port, u8 is_ip4) { udp_main_t *um = &udp_main; udp_dst_port_info_t *pi; /* Done without a lock but the operation is atomic. Writers to pi hash * table and vector should be guarded by a barrier sync */ pi = udp_get_dst_port_info (um, lcl_port, is_ip4); clib_atomic_fetch_add_rel (&pi->n_connections, 1); } udp_connection_t * udp_connection_alloc (u32 thread_index) { udp_main_t *um = &udp_main; udp_connection_t *uc; pool_get_aligned_safe (um->connections[thread_index], uc, CLIB_CACHE_LINE_BYTES); clib_memset (uc, 0, sizeof (*uc)); uc->c_c_index = uc - um->connections[thread_index]; uc->c_thread_index = thread_index; uc->c_proto = TRANSPORT_PROTO_UDP; return uc; } void udp_connection_free (udp_connection_t * uc) { u32 thread_index = uc->c_thread_index; clib_spinlock_free (&uc->rx_lock); if (CLIB_DEBUG) clib_memset (uc, 0xFA, sizeof (*uc)); pool_put (udp_main.connections[thread_index], uc); } static void udp_connection_cleanup (udp_connection_t * uc) { transport_endpoint_cleanup (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip, uc->c_lcl_port); udp_connection_unregister_port (clib_net_to_host_u16 (uc->c_lcl_port), uc->c_is_ip4); udp_connection_free (uc); } void udp_connection_delete (udp_connection_t * uc) { session_transport_delete_notify (&uc->connection); udp_connection_cleanup (uc); } static u8 udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4) { udp_main_t *um = vnet_get_udp_main (); udp_dst_port_info_t *pi; pi = udp_get_dst_port_info (um, lcl_port, is_ip4); return (pi && !pi->n_connections && udp_is_valid_dst_port (lcl_port, is_ip4)); } static u16 udp_default_mtu (udp_main_t * um, u8 is_ip4) { u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t); return (um->default_mtu - sizeof (udp_header_t) - ip_hlen); } static u32 udp_session_bind (u32 session_index, transport_endpoint_cfg_t *lcl) { udp_main_t *um = vnet_get_udp_main (); transport_endpoint_cfg_t *lcl_ext; udp_connection_t *listener; u16 lcl_port_ho; void *iface_ip; lcl_port_ho = clib_net_to_host_u16 (lcl->port); if (udp_connection_port_used_extern (lcl_port_ho, lcl->is_ip4)) { clib_warning ("port already used"); return SESSION_E_PORTINUSE; } pool_get (um->listener_pool, listener); clib_memset (listener, 0, sizeof (udp_connection_t)); listener->c_lcl_port = lcl->port; listener->c_c_index = listener - um->listener_pool; /* If we are provided a sw_if_index, bind using one of its ips */ if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX) { if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index, lcl->is_ip4))) ip_set (&lcl->ip, iface_ip, lcl->is_ip4); } ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4); listener->c_is_ip4 = lcl->is_ip4; listener->c_proto = TRANSPORT_PROTO_UDP; listener->c_s_index = session_index; listener->c_fib_index = lcl->fib_index; listener->mss = udp_default_mtu (um, listener->c_is_ip4); listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN; lcl_ext = (transport_endpoint_cfg_t *) lcl; if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED) listener->flags |= UDP_CONN_F_CONNECTED; else listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS; clib_spinlock_init (&listener->rx_lock); udp_connection_register_port (lcl_port_ho, lcl->is_ip4); return listener->c_c_index; } static u32 udp_session_unbind (u32 listener_index) { udp_main_t *um = &udp_main; udp_connection_t *listener; listener = udp_listener_get (listener_index); udp_connection_unregister_port (clib_net_to_host_u16 (listener->c_lcl_port), listener->c_is_ip4); clib_spinlock_free (&listener->rx_lock); pool_put (um->listener_pool, listener); return 0; } static transport_connection_t * udp_session_get_listener (u32 listener_index) { udp_connection_t *us; us = udp_listener_get (listener_index); return &us->connection; } always_inline u32 udp_push_one_header (vlib_main_t *vm, udp_connection_t *uc, vlib_buffer_t *b) { vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1); if (uc->c_is_ip4) vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4, IP_PROTOCOL_UDP, 1 /* csum offload */, 0 /* is_df */, uc->c_dscp); else vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6, IP_PROTOCOL_UDP); vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index; b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; return 0; } static u32 udp_push_header (transport_connection_t *tc, vlib_buffer_t **bs, u32 n_bufs) { vlib_main_t *vm = vlib_get_main (); udp_connection_t *uc; uc = udp_connection_from_transport (tc); while (n_bufs >= 4) { vlib_prefetch_buffer_header (bs[2], STORE); vlib_prefetch_buffer_header (bs[3], STORE); udp_push_one_header (vm, uc, bs[0]); udp_push_one_header (vm, uc, bs[1]); n_bufs -= 2; bs += 2; } while (n_bufs) { if (n_bufs > 1) vlib_prefetch_buffer_header (bs[1], STORE); udp_push_one_header (vm, uc, bs[0]); n_bufs -= 1; bs += 1; } if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING)) { if (!transport_max_tx_dequeue (&uc->connection)) udp_connection_delete (uc); } return 0; } static transport_connection_t * udp_session_get (u32 connection_index, u32 thread_index) { udp_connection_t *uc; uc = udp_connection_get (connection_index, thread_index); if (uc) return &uc->connection; return 0; } static void udp_session_close (u32 connection_index, u32 thread_index) { udp_connection_t *uc; uc = udp_connection_get (connection_index, thread_index); if (!uc || (uc->flags & UDP_CONN_F_MIGRATED)) return; if (!transport_max_tx_dequeue (&uc->connection)) udp_connection_delete (uc); else uc->flags |= UDP_CONN_F_CLOSING; } static void udp_session_cleanup (u32 connection_index, u32 thread_index) { udp_connection_t *uc; uc = udp_connection_get (connection_index, thread_index); if (!uc) return; if (uc->flags & UDP_CONN_F_MIGRATED) udp_connection_free (uc); else udp_connection_cleanup (uc); } static int udp_session_send_params (transport_connection_t * tconn, transport_send_params_t * sp) { udp_connection_t *uc; uc = udp_connection_from_transport (tconn); /* No constraint on TX window */ sp->snd_space = ~0; /* TODO figure out MTU of output interface */ sp->snd_mss = uc->mss; sp->tx_offset = 0; sp->flags = 0; return 0; } static int udp_open_connection (transport_endpoint_cfg_t * rmt) { udp_main_t *um = &udp_main; ip46_address_t lcl_addr; udp_connection_t *uc; u32 thread_index; u16 lcl_port; int rv; rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr, &lcl_port); if (rv) { if (rv != SESSION_E_PORTINUSE) return rv; if (udp_connection_port_used_extern (lcl_port, rmt->is_ip4)) return SESSION_E_PORTINUSE; /* If port in use, check if 5-tuple is also in use */ if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip, lcl_port, rmt->port, TRANSPORT_PROTO_UDP, rmt->is_ip4)) return SESSION_E_PORTINUSE; /* 5-tuple is available so increase lcl endpoint refcount and proceed * with connection allocation */ transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr, lcl_port); goto conn_alloc; } if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4)) { /* If specific source port was requested abort */ if (rmt->peer.port) return SESSION_E_PORTINUSE; /* Try to find a port that's not used */ while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4)) { lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr); if (lcl_port < 1) return SESSION_E_PORTINUSE; } } conn_alloc: udp_connection_register_port (lcl_port, rmt->is_ip4); /* We don't poll main thread if we have workers */ thread_index = transport_cl_thread (); uc = udp_connection_alloc (thread_index); ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4); ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4); uc->c_rmt_port = rmt->port; uc->c_lcl_port = clib_host_to_net_u16 (lcl_port); uc->c_is_ip4 = rmt->is_ip4; uc->c_proto = TRANSPORT_PROTO_UDP; uc->c_fib_index = rmt->fib_index; uc->c_dscp = rmt->dscp; uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4); uc->flags |= UDP_CONN_F_OWNS_PORT; if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED) { uc->flags |= UDP_CONN_F_CONNECTED; } else { clib_spinlock_init (&uc->rx_lock); uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS; } return uc->c_c_index; } static transport_connection_t * udp_session_get_half_open (u32 conn_index) { udp_connection_t *uc; u32 thread_index; /* We don't poll main thread if we have workers */ thread_index = transport_cl_thread (); uc = udp_connection_get (conn_index, thread_index); if (!uc) return 0; return &uc->connection; } static u8 * format_udp_session (u8 * s, va_list * args) { u32 uci = va_arg (*args, u32); u32 thread_index = va_arg (*args, u32); u32 verbose = va_arg (*args, u32); udp_connection_t *uc; uc = udp_connection_get (uci, thread_index); return format (s, "%U", format_udp_connection, uc, verbose); } static u8 * format_udp_half_open_session (u8 * s, va_list * args) { u32 __clib_unused tci = va_arg (*args, u32); u32 __clib_unused thread_index = va_arg (*args, u32); clib_warning ("BUG"); return 0; } static u8 * format_udp_listener_session (u8 * s, va_list * args) { u32 tci = va_arg (*args, u32); u32 __clib_unused thread_index = va_arg (*args, u32); u32 verbose = va_arg (*args, u32); udp_connection_t *uc = udp_listener_get (tci); return format (s, "%U", format_udp_connection, uc, verbose); } /* *INDENT-OFF* */ static const transport_proto_vft_t udp_proto = { .start_listen = udp_session_bind, .connect = udp_open_connection, .stop_listen = udp_session_unbind, .push_header = udp_push_header, .get_connection = udp_session_get, .get_listener = udp_session_get_listener, .get_half_open = udp_session_get_half_open, .close = udp_session_close, .cleanup = udp_session_cleanup, .send_params = udp_session_send_params, .format_connection = format_udp_session, .format_half_open = format_udp_half_open_session, .format_listener = format_udp_listener_session, .transport_options = { .name = "udp", .short_name = "U", .tx_type = TRANSPORT_TX_DGRAM, .service_type = TRANSPORT_SERVICE_CL, }, }; /* *INDENT-ON* */ static clib_error_t * udp_init (vlib_main_t * vm) { udp_main_t *um = vnet_get_udp_main (); ip_main_t *im = &ip_main; vlib_thread_main_t *tm = vlib_get_thread_main (); u32 num_threads; ip_protocol_info_t *pi; /* * Registrations */ /* IP registration */ pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP); if (pi == 0) return clib_error_return (0, "UDP protocol info AWOL"); pi->format_header = format_udp_header; pi->unformat_pg_edit = unformat_pg_udp_header; /* Register as transport with URI */ transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto, FIB_PROTOCOL_IP4, ip4_lookup_node.index); transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto, FIB_PROTOCOL_IP6, ip6_lookup_node.index); /* * Initialize data structures */ num_threads = 1 /* main thread */ + tm->n_threads; vec_validate (um->connections, num_threads - 1); um->local_to_input_edge[UDP_IP4] = vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index); um->local_to_input_edge[UDP_IP6] = vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index); um->default_mtu = 1500; return 0; } /* *INDENT-OFF* */ VLIB_INIT_FUNCTION (udp_init) = { .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init", "ip6_lookup_init"), }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */