/*
* Copyright (c) 2018 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 NAT44 endpoint-dependent inside to outside network translation
*/
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/udp/udp.h>
#include <vppinfra/error.h>
#include <nat/nat.h>
#include <nat/nat_ipfix_logging.h>
#include <nat/nat_inlines.h>
#include <nat/nat44/inlines.h>
#include <nat/nat_syslog.h>
#include <nat/nat_ha.h>
#include <nat/nat44/ed_inlines.h>
#include <nat/lib/nat_inlines.h>
static char *nat_in2out_ed_error_strings[] = {
#define _(sym,string) string,
foreach_nat_in2out_ed_error
#undef _
};
typedef struct
{
u32 sw_if_index;
u32 next_index;
u32 session_index;
u32 is_slow_path;
} nat_in2out_ed_trace_t;
static u8 *
format_nat_in2out_ed_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
char *tag;
tag =
t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
"NAT44_IN2OUT_ED_FAST_PATH";
s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
t->sw_if_index, t->next_index, t->session_index);
return s;
}
#ifndef CLIB_MARCH_VARIANT
int
nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
{
snat_main_t *sm = &snat_main;
nat44_is_idle_session_ctx_t *ctx = arg;
snat_session_t *s;
u64 sess_timeout_time;
u8 proto;
u16 r_port, l_port;
ip4_address_t *l_addr, *r_addr;
u32 fib_index;
clib_bihash_kv_16_8_t ed_kv;
int i;
snat_address_t *a;
snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
ctx->thread_index);
ASSERT (ctx->thread_index == ed_value_get_thread_index (kv));
s = pool_elt_at_index (tsm->sessions, ed_value_get_session_index (kv));
sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
if (ctx->now >= sess_timeout_time)
{
if (is_fwd_bypass_session (s))
goto delete;
l_addr = &s->out2in.addr;
r_addr = &s->ext_host_addr;
fib_index = s->out2in.fib_index;
if (snat_is_unk_proto_session (s))
{
proto = s->in2out.port;
r_port = 0;
l_port = 0;
}
else
{
proto = nat_proto_to_ip_proto (s->nat_proto);
l_port = s->out2in.port;
r_port = s->ext_host_port;
}
init_ed_k (&ed_kv, *l_addr, l_port, *r_addr, r_port, fib_index, proto);
if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &ed_kv, 0))
nat_elog_warn ("out2in_ed key del failed");
if (snat_is_unk_proto_session (s))
goto delete;
snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
s->in2out.addr.as_u32,
s->out2in.addr.as_u32,
s->nat_proto,
s->in2out.port,
s->out2in.port,
s->in2out.fib_index);
nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
&s->in2out.addr, s->in2out.port,
&s->ext_host_nat_addr, s->ext_host_nat_port,
&s->out2in.addr, s->out2in.port,
&s->ext_host_addr, s->ext_host_port,
s->nat_proto, is_twice_nat_session (s));
nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
s->ext_host_port, s->nat_proto, s->out2in.fib_index,
ctx->thread_index);
if (is_twice_nat_session (s))
{
for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
{
// TODO FIXME this is obviously broken - which address should be
// freed here?!
a = sm->twice_nat_addresses + i;
if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
{
snat_free_outside_address_and_port (sm->twice_nat_addresses,
ctx->thread_index,
&s->ext_host_nat_addr,
s->ext_host_nat_port,
s->nat_proto);
break;
}
}
}
if (snat_is_session_static (s))
goto delete;
snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
&s->out2in.addr, s->out2in.port,
s->nat_proto);
delete:
nat_ed_session_delete (sm, s, ctx->thread_index, 1);
return 1;
}
return 0;
}
#endif
static inline u32
icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
ip4_header_t * ip0, icmp46_header_t * icmp0,
u32 sw_if_index0, u32 rx_fib_index0,
vlib_node_runtime_t * node, u32 next0, f64 now,
u32 thread_index, snat_session_t ** p_s0)
{
vlib_main_t *vm = vlib_get_main ();
next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, thread_index, p_s0, 0);
snat_session_t *s0 = *p_s0;
if (PREDICT_TRUE (next0 != NAT_NEXT_DROP && s0))
{
/* Accounting */
nat44_session_update_counters (s0, now,
vlib_buffer_length_in_chain
(vm, b0), thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s0, thread_index);
}
return next0;
}
static int
nat_ed_alloc_addr_and_port (snat_main_t * sm, u32 rx_fib_index,
u32 nat_proto, u32 thread_index,
ip4_address_t r_addr, u16 r_port, u8 proto,
u16 port_per_thread, u32 snat_thread_index,
snat_session_t * s,
ip4_address_t * outside_addr,
u16 * outside_port,
clib_bihash_kv_16_8_t * out2in_ed_kv)
{
int i;
snat_address_t *a, *ga = 0;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
const u16 port_thread_offset = (port_per_thread * snat_thread_index) + 1024;
for (i = 0; i < vec_len (sm->addresses); i++)
{
a = sm->addresses + i;
switch (nat_proto)
{
#define _(N, j, n, unused) \
case NAT_PROTOCOL_##N: \
if (a->fib_index == rx_fib_index) \
{ \
/* first try port suggested by caller */ \
u16 port = clib_net_to_host_u16 (*outside_port); \
u16 port_offset = port - port_thread_offset; \
if (port <= port_thread_offset || \
port > port_thread_offset + port_per_thread) \
{ \
/* need to pick a different port, suggested port doesn't fit in \
* this thread's port range */ \
port_offset = snat_random_port (1, port_per_thread); \
port = port_thread_offset + port_offset; \
} \
u16 attempts = port_per_thread; \
do \
{ \
init_ed_kv (out2in_ed_kv, a->addr, clib_host_to_net_u16 (port), \
r_addr, r_port, s->out2in.fib_index, proto, \
thread_index, s - tsm->sessions); \
int rv = clib_bihash_add_del_16_8 (&sm->out2in_ed, out2in_ed_kv, \
2 /* is_add */); \
if (0 == rv) \
{ \
++a->busy_##n##_port_refcounts[port]; \
a->busy_##n##_ports_per_thread[thread_index]++; \
a->busy_##n##_ports++; \
*outside_addr = a->addr; \
*outside_port = clib_host_to_net_u16 (port); \
return 0; \
} \
port_offset = (port_offset + 1) % port_per_thread; \
port = port_thread_offset + port_offset; \
--attempts; \
} \
while (attempts > 0); \
} \
else if (a->fib_index == ~0) \
{ \
ga = a; \
} \
break;
foreach_nat_protocol;
default:
nat_elog_info ("unknown protocol");
return 1;
}
}
if (ga)
{
/* fake fib_index to reuse macro */
rx_fib_index = ~0;
a = ga;
switch (nat_proto)
{
foreach_nat_protocol;
default:
nat_elog_info ("unknown protocol");
return 1;
}
}
#undef _
/* Totally out of translations to use... */
snat_ipfix_logging_addresses_exhausted (thread_index, 0);
return 1;
}
static_always_inline u32
nat_outside_fib_index_lookup (snat_main_t * sm, ip4_address_t addr)
{
fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
nat_outside_fib_t *outside_fib;
fib_prefix_t pfx = {
.fp_proto = FIB_PROTOCOL_IP4,
.fp_len = 32,
.fp_addr = {.ip4.as_u32 = addr.as_u32,}
,
};
// TODO: multiple vrfs none can resolve addr
/* *INDENT-OFF* */
vec_foreach (outside_fib, sm->outside_fibs)
{
fei = fib_table_lookup (outside_fib->fib_index, &pfx);
if (FIB_NODE_INDEX_INVALID != fei)
{
if (fib_entry_get_resolving_interface (fei) != ~0)
{
return outside_fib->fib_index;
}
}
}
/* *INDENT-ON* */
return ~0;
}
static u32
slow_path_ed (snat_main_t * sm,
vlib_buffer_t * b,
ip4_address_t l_addr,
ip4_address_t r_addr,
u16 l_port,
u16 r_port,
u8 proto,
u32 rx_fib_index,
snat_session_t ** sessionp,
vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now)
{
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
clib_bihash_kv_16_8_t out2in_ed_kv;
nat44_is_idle_session_ctx_t ctx;
ip4_address_t outside_addr;
u16 outside_port;
u8 identity_nat;
u32 nat_proto = ip_proto_to_nat_proto (proto);
snat_session_t *s = NULL;
lb_nat_type_t lb = 0;
if (PREDICT_TRUE (nat_proto == NAT_PROTOCOL_TCP))
{
if (PREDICT_FALSE
(!tcp_flags_is_init
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
return NAT_NEXT_DROP;
}
}
if (PREDICT_FALSE
(nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
{
if (!nat_lru_free_one (sm, thread_index, now))
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
nat_ipfix_logging_max_sessions (thread_index,
sm->max_translations_per_thread);
nat_elog_notice ("maximum sessions exceeded");
return NAT_NEXT_DROP;
}
}
ip4_address_t sm_addr;
u16 sm_port;
u32 sm_fib_index;
/* First try to match static mapping by local address and port */
if (snat_static_mapping_match
(sm, l_addr, l_port, rx_fib_index, nat_proto, &sm_addr, &sm_port,
&sm_fib_index, 0, 0, 0, &lb, 0, &identity_nat))
{
s = nat_ed_session_alloc (sm, thread_index, now, proto);
if (!s)
{
nat_elog_warn ("create NAT session failed");
b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
return NAT_NEXT_DROP;
}
s->in2out.addr = l_addr;
s->in2out.port = l_port;
s->nat_proto = nat_proto;
s->in2out.fib_index = rx_fib_index;
s->out2in.fib_index = sm->outside_fib_index;
switch (vec_len (sm->outside_fibs))
{
case 0:
s->out2in.fib_index = sm->outside_fib_index;
break;
case 1:
s->out2in.fib_index = sm->outside_fibs[0].fib_index;
break;
default:
s->out2in.fib_index = nat_outside_fib_index_lookup (sm, r_addr);
break;
}
/* Try to create dynamic translation */
outside_port = l_port; // suggest using local port to allocation function
if (nat_ed_alloc_addr_and_port (sm, rx_fib_index, nat_proto,
thread_index, r_addr, r_port, proto,
sm->port_per_thread,
tsm->snat_thread_index, s,
&outside_addr,
&outside_port, &out2in_ed_kv))
{
nat_elog_notice ("addresses exhausted");
b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
nat_ed_session_delete (sm, s, thread_index, 1);
return NAT_NEXT_DROP;
}
s->out2in.addr = outside_addr;
s->out2in.port = outside_port;
}
else
{
if (PREDICT_FALSE (identity_nat))
{
*sessionp = NULL;
return next;
}
s = nat_ed_session_alloc (sm, thread_index, now, proto);
if (!s)
{
nat_elog_warn ("create NAT session failed");
b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
return NAT_NEXT_DROP;
}
s->out2in.addr = sm_addr;
s->out2in.port = sm_port;
s->in2out.addr = l_addr;
s->in2out.port = l_port;
s->nat_proto = nat_proto;
s->in2out.fib_index = rx_fib_index;
s->out2in.fib_index = sm->outside_fib_index;
switch (vec_len (sm->outside_fibs))
{
case 0:
s->out2in.fib_index = sm->outside_fib_index;
break;
case 1:
s->out2in.fib_index = sm->outside_fibs[0].fib_index;
break;
default:
s->out2in.fib_index = nat_outside_fib_index_lookup (sm, r_addr);
break;
}
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
init_ed_kv (&out2in_ed_kv, sm_addr, sm_port, r_addr, r_port,
s->out2in.fib_index, proto, thread_index,
s - tsm->sessions);
if (clib_bihash_add_or_overwrite_stale_16_8
(&sm->out2in_ed, &out2in_ed_kv, nat44_o2i_ed_is_idle_session_cb,
&ctx))
nat_elog_notice ("out2in-ed key add failed");
}
if (lb)
s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
s->ext_host_addr = r_addr;
s->ext_host_port = r_port;
clib_bihash_kv_16_8_t in2out_ed_kv;
init_ed_kv (&in2out_ed_kv, l_addr, l_port, r_addr, r_port, rx_fib_index,
proto, thread_index, s - tsm->sessions);
ctx.now = now;
ctx.thread_index = thread_index;
if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &in2out_ed_kv,
nat44_i2o_ed_is_idle_session_cb,
&ctx))
nat_elog_notice ("in2out-ed key add failed");
*sessionp = s;
/* log NAT event */
snat_ipfix_logging_nat44_ses_create (thread_index,
s->in2out.addr.as_u32,
s->out2in.addr.as_u32,
s->nat_proto,
s->in2out.port,
s->out2in.port, s->in2out.fib_index);
nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
&s->in2out.addr, s->in2out.port,
&s->ext_host_nat_addr, s->ext_host_nat_port,
&s->out2in.addr, s->out2in.port,
&s->ext_host_addr, s->ext_host_port, s->nat_proto,
0);
nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
s->out2in.port, &s->ext_host_addr, s->ext_host_port,
&s->ext_host_nat_addr, s->ext_host_nat_port,
s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0);
return next;
}
static_always_inline int
nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
u32 sw_if_index, ip4_header_t * ip, u32 proto,
u32 rx_fib_index, u32 thread_index)
{
udp_header_t *udp = ip4_next_header (ip);
clib_bihash_kv_16_8_t kv, value;
init_ed_k (&kv, ip->dst_address, udp->dst_port, ip->src_address,
udp->src_port, sm->outside_fib_index, ip->protocol);
/* NAT packet aimed at external address if has active sessions */
if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
{
/* or is static mappings */
ip4_address_t dummy_addr;
u16 dummy_port;
u32 dummy_fib_index;
if (!snat_static_mapping_match
(sm, ip->dst_address, udp->dst_port, sm->outside_fib_index, proto,
&dummy_addr, &dummy_port, &dummy_fib_index, 1, 0, 0, 0, 0, 0))
return 0;
}
else
return 0;
if (sm->forwarding_enabled)
return 1;
return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
rx_fib_index);
}
static_always_inline int
nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
u32 thread_index, f64 now,
vlib_main_t * vm, vlib_buffer_t * b)
{
clib_bihash_kv_16_8_t kv, value;
snat_session_t *s = 0;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
if (!sm->forwarding_enabled)
return 0;
if (ip->protocol == IP_PROTOCOL_ICMP)
{
if (get_icmp_i2o_ed_key (b, ip, 0, ~0, ~0, 0, 0, 0, &kv))
return 0;
}
else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
{
init_ed_k (&kv, ip->src_address, vnet_buffer (b)->ip.reass.l4_src_port,
ip->dst_address, vnet_buffer (b)->ip.reass.l4_dst_port, 0,
ip->protocol);
}
else
{
init_ed_k (&kv, ip->src_address, 0, ip->dst_address, 0, 0,
ip->protocol);
}
if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
{
ASSERT (thread_index == ed_value_get_thread_index (&value));
s =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value));
if (is_fwd_bypass_session (s))
{
if (ip->protocol == IP_PROTOCOL_TCP)
{
if (nat44_set_tcp_session_state_i2o
(sm, now, s, b, thread_index))
return 1;
}
/* Accounting */
nat44_session_update_counters (s, now,
vlib_buffer_length_in_chain (vm, b),
thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s, thread_index);
return 1;
}
else
return 0;
}
return 0;
}
static_always_inline int
nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
u16 src_port, u16 dst_port,
u32 thread_index, u32 rx_sw_if_index,
u32 tx_sw_if_index)
{
clib_bihash_kv_16_8_t kv, value;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
snat_interface_t *i;
snat_session_t *s;
u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
/* src NAT check */
init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
tx_fib_index, ip->protocol);
if (!clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
{
ASSERT (thread_index == ed_value_get_thread_index (&value));
s =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value));
if (nat44_is_ses_closed (s))
{
nat_free_session_data (sm, s, thread_index, 0);
nat_ed_session_delete (sm, s, thread_index, 1);
}
else
s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
return 1;
}
/* dst NAT check */
init_ed_k (&kv, ip->dst_address, dst_port, ip->src_address, src_port,
rx_fib_index, ip->protocol);
if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
{
ASSERT (thread_index == ed_value_get_thread_index (&value));
s =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value));
if (is_fwd_bypass_session (s))
return 0;
/* hairpinning */
/* *INDENT-OFF* */
pool_foreach (i, sm->output_feature_interfaces,
({
if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
return 0;
}));
/* *INDENT-ON* */
return 1;
}
return 0;
}
#ifndef CLIB_MARCH_VARIANT
u32
icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b,
ip4_header_t * ip, ip4_address_t * addr,
u16 * port, u32 * fib_index, nat_protocol_t * proto,
void *d, void *e, u8 * dont_translate)
{
u32 sw_if_index;
u32 rx_fib_index;
clib_bihash_kv_16_8_t kv, value;
u32 next = ~0;
int err;
snat_session_t *s = NULL;
u16 l_port = 0, r_port = 0; // initialize to workaround gcc warning
vlib_main_t *vm = vlib_get_main ();
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
*dont_translate = 0;
sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
err =
get_icmp_i2o_ed_key (b, ip, rx_fib_index, ~0, ~0, proto, &l_port,
&r_port, &kv);
if (err != 0)
{
b->error = node->errors[err];
next = NAT_NEXT_DROP;
goto out;
}
if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
{
if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
{
if (PREDICT_FALSE
(nat44_ed_not_translate_output_feature
(sm, ip, l_port, r_port, thread_index,
sw_if_index, vnet_buffer (b)->sw_if_index[VLIB_TX])))
{
*dont_translate = 1;
goto out;
}
}
else
{
if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
ip, NAT_PROTOCOL_ICMP,
rx_fib_index,
thread_index)))
{
*dont_translate = 1;
goto out;
}
}
if (PREDICT_FALSE
(icmp_type_is_error_message
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
next = NAT_NEXT_DROP;
goto out;
}
next =
slow_path_ed (sm, b, ip->src_address, ip->dst_address, l_port, r_port,
ip->protocol, rx_fib_index, &s, node, next,
thread_index, vlib_time_now (vm));
if (PREDICT_FALSE (next == NAT_NEXT_DROP))
goto out;
if (!s)
{
*dont_translate = 1;
goto out;
}
}
else
{
if (PREDICT_FALSE
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_request
&& vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_reply
&& !icmp_type_is_error_message (vnet_buffer (b)->ip.
reass.icmp_type_or_tcp_flags)))
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
next = NAT_NEXT_DROP;
goto out;
}
ASSERT (thread_index == ed_value_get_thread_index (&value));
s =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value));
}
out:
if (s)
{
*addr = s->out2in.addr;
*port = s->out2in.port;
*fib_index = s->out2in.fib_index;
}
if (d)
{
*(snat_session_t **) d = s;
}
return next;
}
#endif
static snat_session_t *
nat44_ed_in2out_unknown_proto (snat_main_t * sm,
vlib_buffer_t * b,
ip4_header_t * ip,
u32 rx_fib_index,
u32 thread_index,
f64 now,
vlib_main_t * vm, vlib_node_runtime_t * node)
{
clib_bihash_kv_8_8_t kv, value;
clib_bihash_kv_16_8_t s_kv, s_value;
snat_static_mapping_t *m;
u32 old_addr, new_addr = 0;
ip_csum_t sum;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
snat_session_t *s;
u32 outside_fib_index = sm->outside_fib_index;
int i;
u8 is_sm = 0;
switch (vec_len (sm->outside_fibs))
{
case 0:
outside_fib_index = sm->outside_fib_index;
break;
case 1:
outside_fib_index = sm->outside_fibs[0].fib_index;
break;
default:
outside_fib_index = nat_outside_fib_index_lookup (sm, ip->dst_address);
break;
}
old_addr = ip->src_address.as_u32;
init_ed_k (&s_kv, ip->src_address, 0, ip->dst_address, 0, rx_fib_index,
ip->protocol);
if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
{
ASSERT (thread_index == ed_value_get_thread_index (&s_value));
s =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&s_value));
new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
}
else
{
if (PREDICT_FALSE
(nat44_ed_maximum_sessions_exceeded
(sm, rx_fib_index, thread_index)))
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
nat_ipfix_logging_max_sessions (thread_index,
sm->max_translations_per_thread);
nat_elog_notice ("maximum sessions exceeded");
return 0;
}
init_nat_k (&kv, ip->src_address, 0, rx_fib_index, 0);
/* Try to find static mapping first */
if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
{
m = pool_elt_at_index (sm->static_mappings, value.value);
new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
is_sm = 1;
goto create_ses;
}
else
{
/* *INDENT-OFF* */
pool_foreach (s, tsm->sessions, {
if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
{
new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
init_ed_k(&s_kv, s->out2in.addr, 0, ip->dst_address, 0, outside_fib_index, ip->protocol);
if (clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
goto create_ses;
break;
}
});
/* *INDENT-ON* */
for (i = 0; i < vec_len (sm->addresses); i++)
{
init_ed_k (&s_kv, sm->addresses[i].addr, 0, ip->dst_address, 0,
outside_fib_index, ip->protocol);
if (clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
{
new_addr = ip->src_address.as_u32 =
sm->addresses[i].addr.as_u32;
goto create_ses;
}
}
return 0;
}
create_ses:
s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
if (!s)
{
b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
nat_elog_warn ("create NAT session failed");
return 0;
}
s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
s->out2in.addr.as_u32 = new_addr;
s->out2in.fib_index = outside_fib_index;
s->in2out.addr.as_u32 = old_addr;
s->in2out.fib_index = rx_fib_index;
s->in2out.port = s->out2in.port = ip->protocol;
if (is_sm)
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
/* Add to lookup tables */
init_ed_kv (&s_kv, s->in2out.addr, 0, ip->dst_address, 0, rx_fib_index,
ip->protocol, thread_index, s - tsm->sessions);
if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
nat_elog_notice ("in2out key add failed");
init_ed_kv (&s_kv, s->out2in.addr, 0, ip->dst_address, 0,
outside_fib_index, ip->protocol, thread_index,
s - tsm->sessions);
if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
nat_elog_notice ("out2in key add failed");
}
/* Update IP checksum */
sum = ip->checksum;
sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
ip->checksum = ip_csum_fold (sum);
/* Accounting */
nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s, thread_index);
/* Hairpinning */
if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
nat44_ed_hairpinning_unknown_proto (sm, b, ip);
if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
return s;
}
static inline uword
nat44_ed_in2out_fast_path_node_fn_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int is_output_feature)
{
u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
nat_next_t next_index;
snat_main_t *sm = &snat_main;
f64 now = vlib_time_now (vm);
u32 thread_index = vm->thread_index;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
0, def_slow;
def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH :
NAT_NEXT_IN2OUT_ED_SLOW_PATH;
stats_node_index = sm->ed_in2out_node_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
new_addr0, old_addr0;
u16 old_port0, new_port0;
ip4_header_t *ip0;
udp_header_t *udp0;
tcp_header_t *tcp0;
snat_session_t *s0 = 0;
clib_bihash_kv_16_8_t kv0, value0;
ip_csum_t sum0;
/* speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
if (is_output_feature)
{
vnet_feature_next (&vnet_buffer2 (b0)->nat.arc_next, b0);
iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
}
next0 = vnet_buffer2 (b0)->nat.arc_next;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
iph_offset0);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 =
fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
sw_if_index0);
if (PREDICT_FALSE (ip0->ttl == 1))
{
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
next0 = NAT_NEXT_ICMP_ERROR;
goto trace0;
}
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
proto0 = ip_proto_to_nat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
next0 = def_slow;
goto trace0;
}
if (is_output_feature)
{
if (PREDICT_FALSE (nat_not_translate_output_feature_fwd
(sm, ip0, thread_index, now, vm, b0)))
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = def_slow;
goto trace0;
}
init_ed_k (&kv0, ip0->src_address,
vnet_buffer (b0)->ip.reass.l4_src_port, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
ip0->protocol);
// lookup for session
if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
{
// session does not exist go slow path
next0 = def_slow;
goto trace0;
}
ASSERT (thread_index == ed_value_get_thread_index (&value0));
s0 =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value0));
if (s0->tcp_closed_timestamp)
{
if (now >= s0->tcp_closed_timestamp)
{
// session is closed, go slow path
next0 = def_slow;
}
else
{
// session in transitory timeout, drop
b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TCP_CLOSED];
next0 = NAT_NEXT_DROP;
}
goto trace0;
}
// drop if session expired
u64 sess_timeout_time;
sess_timeout_time = s0->last_heard +
(f64) nat44_session_get_timeout (sm, s0);
if (now >= sess_timeout_time)
{
nat_free_session_data (sm, s0, thread_index, 0);
nat_ed_session_delete (sm, s0, thread_index, 1);
// session is closed, go slow path
next0 = def_slow;
goto trace0;
}
b0->flags |= VNET_BUFFER_F_IS_NATED;
if (!is_output_feature)
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
old_addr0 = ip0->src_address.as_u32;
new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
src_address);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32, ip4_header_t,
dst_address);
ip0->checksum = ip_csum_fold (sum0);
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->src_port = s0->out2in.port;
sum0 = tcp0->checksum;
sum0 =
ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t, length);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
sum0 =
ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.
reass.l4_dst_port, s0->ext_host_port,
ip4_header_t, length);
tcp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
mss_clamping (sm->mss_clamping, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
tcp_packets++;
if (nat44_set_tcp_session_state_i2o
(sm, now, s0, b0, thread_index))
goto trace0;
}
else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
&& udp0->checksum)
{
new_port0 = udp0->src_port = s0->out2in.port;
sum0 = udp0->checksum;
sum0 =
ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address);
sum0 =
ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
length);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.reass.l4_dst_port,
s0->ext_host_port, ip4_header_t, length);
udp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
udp0->checksum = ip_csum_fold (sum0);
udp_packets++;
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->src_port = s0->out2in.port;
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
udp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
udp_packets++;
}
}
/* Accounting */
nat44_session_update_counters (s0, now,
vlib_buffer_length_in_chain
(vm, b0), thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s0, thread_index);
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
nat_in2out_ed_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
t->is_slow_path = 0;
if (s0)
t->session_index = s0 - tsm->sessions;
else
t->session_index = ~0;
}
pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
/* verify speculative enqueue, maybe switch current next frame */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
pkts_processed);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
icmp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
other_packets);
return frame->n_vectors;
}
static inline uword
nat44_ed_in2out_slow_path_node_fn_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int is_output_feature)
{
u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
nat_next_t next_index;
snat_main_t *sm = &snat_main;
f64 now = vlib_time_now (vm);
u32 thread_index = vm->thread_index;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets = 0;
stats_node_index = sm->ed_in2out_slowpath_node_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
new_addr0, old_addr0;
u16 old_port0, new_port0;
ip4_header_t *ip0;
udp_header_t *udp0;
tcp_header_t *tcp0;
icmp46_header_t *icmp0;
snat_session_t *s0 = 0;
clib_bihash_kv_16_8_t kv0, value0;
ip_csum_t sum0;
/* speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
if (is_output_feature)
iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
next0 = vnet_buffer2 (b0)->nat.arc_next;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
iph_offset0);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 =
fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
sw_if_index0);
if (PREDICT_FALSE (ip0->ttl == 1))
{
vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
next0 = NAT_NEXT_ICMP_ERROR;
goto trace0;
}
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
icmp0 = (icmp46_header_t *) udp0;
proto0 = ip_proto_to_nat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
rx_fib_index0,
thread_index, now,
vm, node);
if (!s0)
next0 = NAT_NEXT_DROP;
other_packets++;
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out_ed_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
node, next0, now, thread_index, &s0);
icmp_packets++;
goto trace0;
}
init_ed_k (&kv0, ip0->src_address,
vnet_buffer (b0)->ip.reass.l4_src_port, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
ip0->protocol);
if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
{
ASSERT (thread_index == ed_value_get_thread_index (&value0));
s0 =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value0));
if (s0->tcp_closed_timestamp && now >= s0->tcp_closed_timestamp)
{
nat_free_session_data (sm, s0, thread_index, 0);
nat_ed_session_delete (sm, s0, thread_index, 1);
s0 = NULL;
}
}
if (!s0)
{
if (is_output_feature)
{
if (PREDICT_FALSE
(nat44_ed_not_translate_output_feature
(sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
sw_if_index0,
vnet_buffer (b0)->sw_if_index[VLIB_TX])))
goto trace0;
/*
* Send DHCP packets to the ipv4 stack, or we won't
* be able to use dhcp client on the outside interface
*/
if (PREDICT_FALSE
(proto0 == NAT_PROTOCOL_UDP
&& (vnet_buffer (b0)->ip.reass.l4_dst_port ==
clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server))
&& ip0->dst_address.as_u32 == 0xffffffff))
goto trace0;
}
else
{
if (PREDICT_FALSE
(nat44_ed_not_translate
(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
thread_index)))
goto trace0;
}
next0 =
slow_path_ed (sm, b0, ip0->src_address, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_src_port,
vnet_buffer (b0)->ip.reass.l4_dst_port,
ip0->protocol, rx_fib_index0, &s0, node, next0,
thread_index, now);
if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
goto trace0;
if (PREDICT_FALSE (!s0))
goto trace0;
}
b0->flags |= VNET_BUFFER_F_IS_NATED;
if (!is_output_feature)
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
old_addr0 = ip0->src_address.as_u32;
new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
src_address);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32, ip4_header_t,
dst_address);
ip0->checksum = ip_csum_fold (sum0);
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->src_port = s0->out2in.port;
sum0 = tcp0->checksum;
sum0 =
ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t, length);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
sum0 =
ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.
reass.l4_dst_port, s0->ext_host_port,
ip4_header_t, length);
tcp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
mss_clamping (sm->mss_clamping, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
tcp_packets++;
if (nat44_set_tcp_session_state_i2o
(sm, now, s0, b0, thread_index))
goto trace0;
}
else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
&& udp0->checksum)
{
new_port0 = udp0->src_port = s0->out2in.port;
sum0 = udp0->checksum;
sum0 =
ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address);
sum0 =
ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
length);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
s0->ext_host_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.reass.l4_dst_port,
s0->ext_host_port, ip4_header_t, length);
udp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
udp0->checksum = ip_csum_fold (sum0);
udp_packets++;
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->src_port = s0->out2in.port;
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
udp0->dst_port = s0->ext_host_port;
ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
}
udp_packets++;
}
}
/* Accounting */
nat44_session_update_counters (s0, now,
vlib_buffer_length_in_chain
(vm, b0), thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s0, thread_index);
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
nat_in2out_ed_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
t->is_slow_path = 1;
if (s0)
t->session_index = s0 - tsm->sessions;
else
t->session_index = ~0;
}
pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
/* verify speculative enqueue, maybe switch current next frame */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
pkts_processed);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
icmp_packets);
vlib_node_increment_counter (vm, stats_node_index,
NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
other_packets);
return frame->n_vectors;
}
VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
.name = "nat44-ed-in2out",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat_in2out_ed_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
.error_strings = nat_in2out_ed_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
};
/* *INDENT-ON* */
VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
.name = "nat44-ed-in2out-output",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat_in2out_ed_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
.error_strings = nat_in2out_ed_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
};
/* *INDENT-ON* */
VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
vlib_node_runtime_t *
node, vlib_frame_t * frame)
{
return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
.name = "nat44-ed-in2out-slowpath",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat_in2out_ed_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
.error_strings = nat_in2out_ed_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
};
/* *INDENT-ON* */
VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
vlib_node_runtime_t
* node,
vlib_frame_t * frame)
{
return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
.name = "nat44-ed-in2out-output-slowpath",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat_in2out_ed_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
.error_strings = nat_in2out_ed_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
};
/* *INDENT-ON* */
static u8 *
format_nat_pre_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
return format (s, "in2out next_index %d arc_next_index %d", t->next_index,
t->arc_next_index);
}
VLIB_NODE_FN (nat_pre_in2out_node)
(vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return nat_pre_node_fn_inline (vm, node, frame,
NAT_NEXT_IN2OUT_ED_FAST_PATH);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
.name = "nat-pre-in2out",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat_pre_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/