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/*
* Copyright (c) 2016 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.
*/
/** @file
udp state machine, etc.
*/
#include <vnet/udp/udp.h>
#include <vnet/session/session.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/fib/ip4_fib.h>
udp_connection_t *
udp_connection_alloc (u32 thread_index)
{
udp_main_t *um = &udp_main;
udp_connection_t *uc;
u32 will_expand = 0;
pool_get_aligned_will_expand (um->connections[thread_index], will_expand,
CLIB_CACHE_LINE_BYTES);
if (PREDICT_FALSE (will_expand))
{
clib_spinlock_lock_if_init (&udp_main.peekers_write_locks
[thread_index]);
pool_get_aligned (udp_main.connections[thread_index], uc,
CLIB_CACHE_LINE_BYTES);
clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
[thread_index]);
}
else
{
pool_get_aligned (um->connections[thread_index], uc,
CLIB_CACHE_LINE_BYTES);
}
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;
clib_spinlock_init (&uc->rx_lock);
return uc;
}
void
udp_connection_free (udp_connection_t * uc)
{
pool_put (udp_main.connections[uc->c_thread_index], uc);
if (CLIB_DEBUG)
memset (uc, 0xFA, sizeof (*uc));
}
u32
udp_session_bind (u32 session_index, transport_endpoint_t * lcl)
{
udp_main_t *um = vnet_get_udp_main ();
vlib_main_t *vm = vlib_get_main ();
udp_connection_t *listener;
u32 node_index;
void *iface_ip;
udp_dst_port_info_t *pi;
pi = udp_get_dst_port_info (um, lcl->port, lcl->is_ip4);
if (pi)
return -1;
pool_get (um->listener_pool, listener);
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;
clib_spinlock_init (&listener->rx_lock);
node_index = lcl->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
udp_register_dst_port (vm, clib_net_to_host_u16 (lcl->port), node_index,
1 /* is_ipv4 */ );
return listener->c_c_index;
}
u32
udp_session_unbind (u32 listener_index)
{
vlib_main_t *vm = vlib_get_main ();
udp_connection_t *listener;
listener = udp_listener_get (listener_index);
udp_unregister_dst_port (vm, clib_net_to_host_u16 (listener->c_lcl_port),
listener->c_is_ip4);
return 0;
}
transport_connection_t *
udp_session_get_listener (u32 listener_index)
{
udp_connection_t *us;
us = udp_listener_get (listener_index);
return &us->connection;
}
u32
udp_push_header (transport_connection_t * tc, vlib_buffer_t * b)
{
udp_connection_t *uc;
vlib_main_t *vm = vlib_get_main ();
uc = udp_get_connection_from_transport (tc);
vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1);
if (tc->is_ip4)
vlib_buffer_push_ip4 (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
IP_PROTOCOL_UDP, 1);
else
{
ip6_header_t *ih;
ih = vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
IP_PROTOCOL_UDP);
vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
}
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;
}
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;
}
void
udp_session_close (u32 connection_index, u32 thread_index)
{
vlib_main_t *vm = vlib_get_main ();
udp_connection_t *uc;
uc = udp_connection_get (connection_index, thread_index);
if (uc)
{
udp_unregister_dst_port (vm, clib_net_to_host_u16 (uc->c_lcl_port),
uc->c_is_ip4);
stream_session_delete_notify (&uc->connection);
udp_connection_free (uc);
}
}
void
udp_session_cleanup (u32 connection_index, u32 thread_index)
{
udp_connection_t *uc;
uc = udp_connection_get (connection_index, thread_index);
if (uc)
udp_connection_free (uc);
}
u8 *
format_udp_connection_id (u8 * s, va_list * args)
{
udp_connection_t *uc = va_arg (*args, udp_connection_t *);
if (!uc)
return s;
if (uc->c_is_ip4)
s = format (s, "[#%d][%s] %U:%d->%U:%d", uc->c_thread_index, "U",
format_ip4_address, &uc->c_lcl_ip4,
clib_net_to_host_u16 (uc->c_lcl_port), format_ip4_address,
&uc->c_rmt_ip4, clib_net_to_host_u16 (uc->c_rmt_port));
else
s = format (s, "[#%d][%s] %U:%d->%U:%d", uc->c_thread_index, "U",
format_ip6_address, &uc->c_lcl_ip6,
clib_net_to_host_u16 (uc->c_lcl_port), format_ip6_address,
&uc->c_rmt_ip6, clib_net_to_host_u16 (uc->c_rmt_port));
return s;
}
u8 *
format_udp_connection (u8 * s, va_list * args)
{
udp_connection_t *uc = va_arg (*args, udp_connection_t *);
u32 verbose = va_arg (*args, u32);
if (!uc)
return s;
s = format (s, "%-50U", format_udp_connection_id, uc);
if (verbose)
{
if (verbose == 1)
s = format (s, "%-15s\n", "-");
else
s = format (s, "\n");
}
return s;
}
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);
}
u8 *
format_udp_half_open_session (u8 * s, va_list * args)
{
clib_warning ("BUG");
return 0;
}
u8 *
format_udp_listener_session (u8 * s, va_list * args)
{
u32 tci = va_arg (*args, u32);
udp_connection_t *uc = udp_listener_get (tci);
return format (s, "%U", format_udp_connection, uc);
}
u16
udp_send_mss (transport_connection_t * t)
{
/* TODO figure out MTU of output interface */
return 1460;
}
u32
udp_send_space (transport_connection_t * t)
{
/* No constraint on TX window */
return ~0;
}
int
udp_open_connection (transport_endpoint_t * rmt)
{
udp_main_t *um = vnet_get_udp_main ();
vlib_main_t *vm = vlib_get_main ();
u32 thread_index = vlib_get_thread_index ();
udp_connection_t *uc;
ip46_address_t lcl_addr;
u32 node_index;
u16 lcl_port;
if (transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
&lcl_port))
return -1;
while (udp_get_dst_port_info (um, lcl_port, rmt->is_ip4))
{
lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr);
if (lcl_port < 1)
{
clib_warning ("Failed to allocate src port");
return -1;
}
}
node_index = rmt->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
udp_register_dst_port (vm, lcl_port, node_index, 1 /* is_ipv4 */ );
/* We don't poll main thread if we have workers */
if (vlib_num_workers ())
thread_index = 1;
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;
return uc->c_c_index;
}
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 = vlib_num_workers ()? 1 : 0;
uc = udp_connection_get (conn_index, thread_index);
return &uc->connection;
}
/* *INDENT-OFF* */
const static transport_proto_vft_t udp_proto = {
.bind = udp_session_bind,
.open = udp_open_connection,
.unbind = 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_mss = udp_send_mss,
.send_space = udp_send_space,
.format_connection = format_udp_session,
.format_half_open = format_udp_half_open_session,
.format_listener = format_udp_listener_session,
.tx_type = TRANSPORT_TX_DGRAM,
.service_type = TRANSPORT_SERVICE_CL,
};
/* *INDENT-ON* */
int
udpc_connection_open (transport_endpoint_t * rmt)
{
udp_connection_t *uc;
u32 uc_index;
uc_index = udp_open_connection (rmt);
uc = udp_connection_get (uc_index, vlib_get_thread_index ());
uc->is_connected = 1;
return uc_index;
}
u32
udpc_connection_listen (u32 session_index, transport_endpoint_t * lcl)
{
udp_connection_t *listener;
u32 li;
li = udp_session_bind (session_index, lcl);
listener = udp_listener_get (li);
listener->is_connected = 1;
return li;
}
/* *INDENT-OFF* */
const static transport_proto_vft_t udpc_proto = {
.bind = udpc_connection_listen,
.open = udpc_connection_open,
.unbind = 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_mss = udp_send_mss,
.send_space = udp_send_space,
.format_connection = format_udp_session,
.format_half_open = format_udp_half_open_session,
.format_listener = format_udp_listener_session,
.tx_type = TRANSPORT_TX_DEQUEUE,
.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;
clib_error_t *error = 0;
ip_protocol_info_t *pi;
int i;
if ((error = vlib_call_init_function (vm, ip_main_init)))
return error;
if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
return error;
if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
return error;
/*
* 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);
transport_register_protocol (TRANSPORT_PROTO_UDPC, &udpc_proto,
FIB_PROTOCOL_IP4, ip4_lookup_node.index);
transport_register_protocol (TRANSPORT_PROTO_UDPC, &udpc_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);
vec_validate (um->connection_peekers, num_threads - 1);
vec_validate (um->peekers_readers_locks, num_threads - 1);
vec_validate (um->peekers_write_locks, num_threads - 1);
if (num_threads > 1)
for (i = 0; i < num_threads; i++)
{
clib_spinlock_init (&um->peekers_readers_locks[i]);
clib_spinlock_init (&um->peekers_write_locks[i]);
}
return error;
}
VLIB_INIT_FUNCTION (udp_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/