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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.
*/
#ifndef __included_nat44_ei_inlines_h__
#define __included_nat44_ei_inlines_h__
#include <vppinfra/clib.h>
#include <nat/nat44-ei/nat44_ei.h>
#include <nat/nat44-ei/nat44_ei_ha.h>
always_inline u64
calc_nat_key (ip4_address_t addr, u16 port, u32 fib_index, u8 proto)
{
ASSERT (fib_index <= (1 << 14) - 1);
ASSERT (proto <= (1 << 3) - 1);
return (u64) addr.as_u32 << 32 | (u64) port << 16 | fib_index << 3 |
(proto & 0x7);
}
always_inline void
split_nat_key (u64 key, ip4_address_t *addr, u16 *port, u32 *fib_index,
nat_protocol_t *proto)
{
if (addr)
{
addr->as_u32 = key >> 32;
}
if (port)
{
*port = (key >> 16) & (u16) ~0;
}
if (fib_index)
{
*fib_index = key >> 3 & ((1 << 13) - 1);
}
if (proto)
{
*proto = key & 0x7;
}
}
always_inline void
init_nat_k (clib_bihash_kv_8_8_t *kv, ip4_address_t addr, u16 port,
u32 fib_index, nat_protocol_t proto)
{
kv->key = calc_nat_key (addr, port, fib_index, proto);
kv->value = ~0ULL;
}
always_inline void
init_nat_kv (clib_bihash_kv_8_8_t *kv, ip4_address_t addr, u16 port,
u32 fib_index, nat_protocol_t proto, u32 thread_index,
u32 session_index)
{
init_nat_k (kv, addr, port, fib_index, proto);
kv->value = (u64) thread_index << 32 | session_index;
}
always_inline void
init_nat_i2o_k (clib_bihash_kv_8_8_t *kv, nat44_ei_session_t *s)
{
return init_nat_k (kv, s->in2out.addr, s->in2out.port, s->in2out.fib_index,
s->nat_proto);
}
always_inline void
init_nat_i2o_kv (clib_bihash_kv_8_8_t *kv, nat44_ei_session_t *s,
u32 thread_index, u32 session_index)
{
init_nat_k (kv, s->in2out.addr, s->in2out.port, s->in2out.fib_index,
s->nat_proto);
kv->value = (u64) thread_index << 32 | session_index;
}
always_inline void
init_nat_o2i_k (clib_bihash_kv_8_8_t *kv, nat44_ei_session_t *s)
{
return init_nat_k (kv, s->out2in.addr, s->out2in.port, s->out2in.fib_index,
s->nat_proto);
}
always_inline void
init_nat_o2i_kv (clib_bihash_kv_8_8_t *kv, nat44_ei_session_t *s,
u32 thread_index, u32 session_index)
{
init_nat_k (kv, s->out2in.addr, s->out2in.port, s->out2in.fib_index,
s->nat_proto);
kv->value = (u64) thread_index << 32 | session_index;
}
always_inline u32
nat_value_get_thread_index (clib_bihash_kv_8_8_t *value)
{
return value->value >> 32;
}
always_inline u32
nat_value_get_session_index (clib_bihash_kv_8_8_t *value)
{
return value->value & ~(u32) 0;
}
always_inline u8
nat44_ei_is_interface_addr (ip4_main_t *im, vlib_node_runtime_t *node,
u32 sw_if_index0, u32 ip4_addr)
{
nat44_ei_runtime_t *rt = (nat44_ei_runtime_t *) node->runtime_data;
u8 ip4_addr_exists;
if (PREDICT_FALSE (rt->cached_sw_if_index != sw_if_index0))
{
ip_lookup_main_t *lm = &im->lookup_main;
ip_interface_address_t *ia;
ip4_address_t *a;
rt->cached_sw_if_index = ~0;
hash_free (rt->cached_presence_by_ip4_address);
foreach_ip_interface_address (
lm, ia, sw_if_index0, 1 /* honor unnumbered */, ({
a = ip_interface_address_get_address (lm, ia);
hash_set (rt->cached_presence_by_ip4_address, a->as_u32, 1);
rt->cached_sw_if_index = sw_if_index0;
}));
if (rt->cached_sw_if_index == ~0)
return 0;
}
ip4_addr_exists = !!hash_get (rt->cached_presence_by_ip4_address, ip4_addr);
if (PREDICT_FALSE (ip4_addr_exists))
return 1;
else
return 0;
}
/** \brief Per-user LRU list maintenance */
always_inline void
nat44_ei_session_update_lru (nat44_ei_main_t *nm, nat44_ei_session_t *s,
u32 thread_index)
{
/* don't update too often - timeout is in magnitude of seconds anyway */
if (s->last_heard > s->last_lru_update + 1)
{
clib_dlist_remove (nm->per_thread_data[thread_index].list_pool,
s->per_user_index);
clib_dlist_addtail (nm->per_thread_data[thread_index].list_pool,
s->per_user_list_head_index, s->per_user_index);
s->last_lru_update = s->last_heard;
}
}
always_inline void
nat44_ei_user_session_increment (nat44_ei_main_t *nm, nat44_ei_user_t *u,
u8 is_static)
{
if (u->nsessions + u->nstaticsessions < nm->max_translations_per_user)
{
if (is_static)
u->nstaticsessions++;
else
u->nsessions++;
}
}
always_inline void
nat44_ei_delete_user_with_no_session (nat44_ei_main_t *nm, nat44_ei_user_t *u,
u32 thread_index)
{
clib_bihash_kv_8_8_t kv;
nat44_ei_user_key_t u_key;
nat44_ei_main_per_thread_data_t *tnm =
vec_elt_at_index (nm->per_thread_data, thread_index);
if (u->nstaticsessions == 0 && u->nsessions == 0)
{
u_key.addr.as_u32 = u->addr.as_u32;
u_key.fib_index = u->fib_index;
kv.key = u_key.as_u64;
pool_put_index (tnm->list_pool, u->sessions_per_user_list_head_index);
pool_put (tnm->users, u);
clib_bihash_add_del_8_8 (&tnm->user_hash, &kv, 0);
vlib_set_simple_counter (&nm->total_users, thread_index, 0,
pool_elts (tnm->users));
}
}
static_always_inline u8
nat44_ei_maximum_sessions_exceeded (nat44_ei_main_t *nm, u32 thread_index)
{
if (pool_elts (nm->per_thread_data[thread_index].sessions) >=
nm->max_translations_per_thread)
return 1;
return 0;
}
always_inline void
nat44_ei_session_update_counters (nat44_ei_session_t *s, f64 now, uword bytes,
u32 thread_index)
{
s->last_heard = now;
s->total_pkts++;
s->total_bytes += bytes;
nat_ha_sref (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
s->ext_host_port, s->nat_proto, s->out2in.fib_index,
s->total_pkts, s->total_bytes, thread_index,
&s->ha_last_refreshed, now);
}
#endif /* __included_nat44_ei_inlines_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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