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/*
* Copyright (c) 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.
*/
/**
* @file
* @brief NAT port/address allocation lib
*/
#include <nat/lib/alloc.h>
static_always_inline void
nat_ip4_addr_increment (ip4_address_t * addr)
{
u32 v;
v = clib_net_to_host_u32 (addr->as_u32) + 1;
addr->as_u32 = clib_host_to_net_u32 (v);
}
int
nat_add_del_ip4_pool_addr (nat_ip4_pool_t * pool, ip4_address_t addr,
u8 is_add)
{
int i;
nat_ip4_pool_addr_t *a = 0;
vlib_thread_main_t *tm = vlib_get_thread_main ();
// lookup for the address
for (i = 0; i < vec_len (pool); i++)
{
if (pool->pool_addr[i].addr.as_u32 == addr.as_u32)
{
a = pool->pool_addr + 1;
break;
}
}
if (is_add)
{
if (a)
return NAT_ERROR_VALUE_EXIST;
vec_add2 (pool->pool_addr, a, 1);
a->addr = addr;
#define _(N, i, n, s) \
clib_bitmap_alloc (a->busy_##n##_port_bitmap, 65535); \
a->busy_##n##_ports = 0; \
vec_validate_init_empty (a->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0);
foreach_nat_protocol
#undef _
}
else
{
if (!a)
return NAT_ERROR_NO_SUCH_ENTRY;
#define _(N, id, n, s) \
clib_bitmap_free (a->busy_##n##_port_bitmap); \
vec_free (a->busy_##n##_ports_per_thread);
foreach_nat_protocol
#undef _
vec_del1 (pool->pool_addr, i);
}
return 0;
}
int
nat_add_del_ip4_pool_addrs (nat_ip4_pool_t * pool,
ip4_address_t addr, u32 count, u8 is_add,
void *opaque)
{
int i, rv;
for (i = 0; i < count; i++)
{
// TODO:
// a) consider if we could benefit from pre and post cb
// b) consider if we could benefit from add/del cb separation
// pre call:
// pool->add_del_pool_addr_pre_cb (&addr, is_add, opaque);
if ((rv = nat_add_del_ip4_pool_addr (pool, addr, is_add)) != 0)
return rv;
// post call:
// pool->add_del_pool_addr_post_cb (&addr, is_add, opaque);
pool->add_del_pool_addr_cb (addr, is_add, opaque);
nat_ip4_addr_increment (&addr);
}
return 0;
}
static_always_inline u16
nat_random_port (u32 random_seed, u16 min, u16 max)
{
return min + random_u32 (&random_seed) /
(random_u32_max () / (max - min + 1) + 1);
}
int
nat_alloc_ip4_addr_and_port_cb_default (nat_ip4_pool_t * pool,
u32 fib_index,
u32 thread_index,
u32 nat_thread_index,
u16 port_per_thread,
u16 protocol,
nat_ip4_addr_port_t * out)
{
nat_ip4_pool_addr_t *a, *ga = 0;
u32 i;
u32 portnum;
for (i = 0; i < vec_len (pool->pool_addr); i++)
{
a = pool->pool_addr + i;
switch (protocol)
{
#define _(N, j, n, s) \
case NAT_PROTOCOL_##N: \
if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
{ \
if (a->fib_index == fib_index) \
{ \
while (1) \
{ \
portnum = (port_per_thread * \
nat_thread_index) + \
nat_random_port(pool->random_seed, 1, port_per_thread) + 1024; \
if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
continue; \
clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
a->busy_##n##_ports_per_thread[thread_index]++; \
a->busy_##n##_ports++; \
out->addr = a->addr; \
out->port = clib_host_to_net_u16(portnum); \
return 0; \
} \
} \
else if (a->fib_index == ~0) \
{ \
ga = a; \
} \
} \
break;
foreach_nat_protocol
#undef _
default:
return NAT_ERROR_UNKNOWN_PROTOCOL;
}
}
if (ga)
{
a = ga;
switch (protocol)
{
#define _(N, j, n, s) \
case NAT_PROTOCOL_##N: \
while (1) \
{ \
portnum = (port_per_thread * \
nat_thread_index) + \
nat_random_port(pool->random_seed, 1, port_per_thread) + 1024; \
if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
continue; \
clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
a->busy_##n##_ports_per_thread[thread_index]++; \
a->busy_##n##_ports++; \
out->addr = a->addr; \
out->port = clib_host_to_net_u16(portnum); \
return 0; \
}
break;
foreach_nat_protocol
#undef _
default:
return NAT_ERROR_UNKNOWN_PROTOCOL;
}
}
return NAT_ERROR_OUT_OF_TRANSLATIONS;
}
int
nat_alloc_ip4_addr_and_port (nat_ip4_pool_t * pool,
u32 fib_index,
u32 thread_index,
u32 nat_thread_index,
u16 port_per_thread,
u16 protocol, nat_ip4_addr_port_t * out)
{
return pool->alloc_addr_and_port_cb (pool,
fib_index,
thread_index,
nat_thread_index,
port_per_thread, protocol, out);
}
// TODO: consider using standard u16 port and ip4_address_t as input ?
int
nat_free_ip4_addr_and_port (nat_ip4_pool_t * pool,
u32 thread_index,
u16 protocol, nat_ip4_addr_port_t * addr_port)
{
nat_ip4_pool_addr_t *a = 0;
u32 i;
u16 port = clib_net_to_host_u16 (addr_port->port);
for (i = 0; i < vec_len (pool->pool_addr); i++)
{
if (pool->pool_addr[i].addr.as_u32 == addr_port->addr.as_u32)
{
a = pool->pool_addr + i;
break;
}
}
if (!a)
{
return NAT_ERROR_NO_SUCH_ENTRY;
}
switch (protocol)
{
#define _(N, i, n, s) \
case NAT_PROTOCOL_##N: \
ASSERT (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \
port) == 1); \
clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, \
port, 0); \
a->busy_##n##_ports--; \
a->busy_##n##_ports_per_thread[thread_index]--; \
break;
foreach_nat_protocol
#undef _
default:
return NAT_ERROR_UNKNOWN_PROTOCOL;
}
return 0;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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