/*
* 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 outside to inside 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>
static char *nat_out2in_ed_error_strings[] = {
#define _(sym,string) string,
foreach_nat_out2in_ed_error
#undef _
};
typedef struct
{
u32 sw_if_index;
u32 next_index;
u32 session_index;
u32 is_slow_path;
} nat44_ed_out2in_trace_t;
static u8 *
format_nat44_ed_out2in_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 *);
nat44_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *);
char *tag;
tag =
t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" :
"NAT44_OUT2IN_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;
}
static inline u32
icmp_out2in_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_out2in (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;
}
#ifndef CLIB_MARCH_VARIANT
int
nat44_o2i_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);
s = pool_elt_at_index (tsm->sessions, kv->value);
sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
if (ctx->now >= sess_timeout_time)
{
l_addr = &s->in2out.addr;
r_addr = &s->ext_host_addr;
fib_index = s->in2out.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->in2out.port;
r_port = s->ext_host_port;
}
if (is_twice_nat_session (s))
{
r_addr = &s->ext_host_nat_addr;
r_port = s->ext_host_nat_port;
}
init_ed_k (&ed_kv, *l_addr, l_port, *r_addr, r_port, fib_index, proto);
if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0))
nat_elog_warn ("in2out_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++)
{
// FIXME TODO this is obviously wrong code ... needs fix!
// key.protocol = s->nat_proto;
// key.port = s->ext_host_nat_port;
// 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,
// &key);
// 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 snat_session_t *
create_session_for_static_mapping_ed (snat_main_t * sm,
vlib_buffer_t * b,
ip4_address_t i2o_addr,
u16 i2o_port,
u32 i2o_fib_index,
ip4_address_t o2i_addr,
u16 o2i_port,
u32 o2i_fib_index,
nat_protocol_t nat_proto,
vlib_node_runtime_t * node,
u32 rx_fib_index,
u32 thread_index,
twice_nat_type_t twice_nat,
lb_nat_type_t lb_nat, f64 now)
{
snat_session_t *s;
ip4_header_t *ip;
udp_header_t *udp;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
clib_bihash_kv_16_8_t kv;
nat44_is_idle_session_ctx_t ctx;
if (PREDICT_FALSE
(nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
nat_elog_notice ("maximum sessions exceeded");
return 0;
}
s = nat_ed_session_alloc (sm, thread_index, now, nat_proto);
if (!s)
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
nat_elog_warn ("create NAT session failed");
return 0;
}
ip = vlib_buffer_get_current (b);
udp = ip4_next_header (ip);
s->ext_host_addr.as_u32 = ip->src_address.as_u32;
s->ext_host_port = nat_proto == NAT_PROTOCOL_ICMP ? 0 : udp->src_port;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
if (lb_nat)
s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
if (lb_nat == AFFINITY_LB_NAT)
s->flags |= SNAT_SESSION_FLAG_AFFINITY;
s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
s->out2in.addr = o2i_addr;
s->out2in.port = o2i_port;
s->out2in.fib_index = o2i_fib_index;
s->in2out.addr = i2o_addr;
s->in2out.port = i2o_port;
s->in2out.fib_index = i2o_fib_index;
s->nat_proto = nat_proto;
/* Add to lookup tables */
init_ed_kv (&kv, o2i_addr, o2i_port, s->ext_host_addr, s->ext_host_port,
o2i_fib_index, ip->protocol, thread_index, s - tsm->sessions);
ctx.now = now;
ctx.thread_index = thread_index;
if (clib_bihash_add_or_overwrite_stale_16_8 (&sm->out2in_ed, &kv,
nat44_o2i_ed_is_idle_session_cb,
&ctx))
nat_elog_notice ("out2in-ed key add failed");
if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF &&
ip->src_address.as_u32 == i2o_addr.as_u32))
{
if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0,
thread_index,
nat_proto,
&s->ext_host_nat_addr,
&s->ext_host_nat_port,
sm->port_per_thread,
tsm->snat_thread_index))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS];
nat_ed_session_delete (sm, s, thread_index, 1);
if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &kv, 0))
nat_elog_notice ("out2in-ed key del failed");
return 0;
}
s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
init_ed_kv (&kv, i2o_addr, i2o_port, s->ext_host_nat_addr,
s->ext_host_nat_port, i2o_fib_index, ip->protocol,
thread_index, s - tsm->sessions);
}
else
{
init_ed_kv (&kv, i2o_addr, i2o_port, s->ext_host_addr,
s->ext_host_port, i2o_fib_index, ip->protocol,
thread_index, s - tsm->sessions);
}
if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &kv,
nat44_i2o_ed_is_idle_session_cb,
&ctx))
nat_elog_notice ("in2out-ed key add failed");
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, is_twice_nat_session (s));
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);
per_vrf_sessions_register_session (s, thread_index);
return s;
}
static int
next_src_nat (snat_main_t * sm, ip4_header_t * ip, u16 src_port,
u16 dst_port, u32 thread_index, u32 rx_fib_index)
{
clib_bihash_kv_16_8_t kv, value;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
rx_fib_index, ip->protocol);
if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
return 1;
return 0;
}
static void
create_bypass_for_fwd (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip,
u32 rx_fib_index, u32 thread_index)
{
clib_bihash_kv_16_8_t kv, value;
udp_header_t *udp;
snat_session_t *s = 0;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
vlib_main_t *vm = vlib_get_main ();
f64 now = vlib_time_now (vm);
u16 l_port, r_port;
if (ip->protocol == IP_PROTOCOL_ICMP)
{
if (get_icmp_o2i_ed_key
(b, ip, rx_fib_index, ~0, ~0, 0, &l_port, &r_port, &kv))
return;
}
else
{
if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
{
udp = ip4_next_header (ip);
l_port = udp->dst_port;
r_port = udp->src_port;
}
else
{
l_port = 0;
r_port = 0;
}
init_ed_k (&kv, ip->dst_address, l_port, ip->src_address, r_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));
}
else
{
u32 proto;
if (PREDICT_FALSE
(nat44_ed_maximum_sessions_exceeded
(sm, rx_fib_index, thread_index)))
return;
s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
if (!s)
{
nat_elog_warn ("create NAT session failed");
return;
}
proto = ip_proto_to_nat_proto (ip->protocol);
s->ext_host_addr = ip->src_address;
s->ext_host_port = r_port;
s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS;
s->out2in.addr = ip->dst_address;
s->out2in.port = l_port;
s->nat_proto = proto;
if (proto == NAT_PROTOCOL_OTHER)
{
s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
s->out2in.port = ip->protocol;
}
s->out2in.fib_index = 0;
s->in2out.addr = s->out2in.addr;
s->in2out.port = s->out2in.port;
s->in2out.fib_index = s->out2in.fib_index;
kv.value = s - tsm->sessions;
if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1))
nat_elog_notice ("in2out_ed key add failed");
per_vrf_sessions_register_session (s, thread_index);
}
if (ip->protocol == IP_PROTOCOL_TCP)
{
tcp_header_t *tcp = ip4_next_header (ip);
if (nat44_set_tcp_session_state_o2i
(sm, now, s, tcp->flags, tcp->ack_number, tcp->seq_number,
thread_index))
return;
}
/* Accounting */
nat44_session_update_counters (s, now, 0, thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s, thread_index);
}
static inline void
create_bypass_for_fwd_worker (snat_main_t * sm, vlib_buffer_t * b,
ip4_header_t * ip, u32 rx_fib_index)
{
ip4_header_t ip_wkr = {
.src_address = ip->dst_address,
};
u32 thread_index = sm->worker_in2out_cb (&ip_wkr, rx_fib_index, 0);
create_bypass_for_fwd (sm, b, ip, rx_fib_index, thread_index);
}
#ifndef CLIB_MARCH_VARIANT
u32
icmp_match_out2in_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 next = ~0, sw_if_index, rx_fib_index;
clib_bihash_kv_16_8_t kv, value;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
snat_session_t *s = 0;
u8 is_addr_only, identity_nat;
u16 l_port, r_port;
vlib_main_t *vm = vlib_get_main ();
ip4_address_t sm_addr;
u16 sm_port;
u32 sm_fib_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);
if (get_icmp_o2i_ed_key
(b, ip, rx_fib_index, ~0, ~0, proto, &l_port, &r_port, &kv))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL];
next = NAT_NEXT_DROP;
goto out;
}
if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
{
/* Try to match static mapping */
if (snat_static_mapping_match
(sm, ip->dst_address, l_port, rx_fib_index,
ip_proto_to_nat_proto (ip->protocol), &sm_addr, &sm_port,
&sm_fib_index, 1, &is_addr_only, 0, 0, 0, &identity_nat))
{
if (!sm->forwarding_enabled)
{
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index,
ip->dst_address.as_u32)))
{
*dont_translate = 1;
goto out;
}
b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
next = NAT_NEXT_DROP;
goto out;
}
else
{
*dont_translate = 1;
if (next_src_nat (sm, ip, l_port, r_port,
thread_index, rx_fib_index))
{
next = NAT_NEXT_IN2OUT_ED_FAST_PATH;
goto out;
}
if (sm->num_workers > 1)
create_bypass_for_fwd_worker (sm, b, ip, rx_fib_index);
else
create_bypass_for_fwd (sm, b, ip, rx_fib_index, thread_index);
goto out;
}
}
if (PREDICT_FALSE
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_reply
&& (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_request || !is_addr_only)))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
next = NAT_NEXT_DROP;
goto out;
}
if (PREDICT_FALSE (identity_nat))
{
*dont_translate = 1;
goto out;
}
/* Create session initiated by host from external network */
s =
create_session_for_static_mapping_ed (sm, b, sm_addr, sm_port,
sm_fib_index, ip->dst_address,
l_port, rx_fib_index, *proto,
node, rx_fib_index,
thread_index, 0, 0,
vlib_time_now (vm));
if (!s)
{
next = NAT_NEXT_DROP;
goto out;
}
}
else
{
if (PREDICT_FALSE
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_reply
&& vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_request
&& !icmp_type_is_error_message (vnet_buffer (b)->ip.
reass.icmp_type_or_tcp_flags)))
{
b->error = node->errors[NAT_OUT2IN_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->in2out.addr;
*port = s->in2out.port;
*fib_index = s->in2out.fib_index;
}
if (d)
*(snat_session_t **) d = s;
return next;
}
#endif
static snat_session_t *
nat44_ed_out2in_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;
ip_csum_t sum;
snat_session_t *s;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
old_addr = ip->dst_address.as_u32;
init_ed_k (&s_kv, ip->dst_address, 0, ip->src_address, 0, rx_fib_index,
ip->protocol);
if (!clib_bihash_search_16_8 (&sm->out2in_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->dst_address.as_u32 = s->in2out.addr.as_u32;
}
else
{
if (PREDICT_FALSE
(nat44_ed_maximum_sessions_exceeded
(sm, rx_fib_index, thread_index)))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
nat_elog_notice ("maximum sessions exceeded");
return 0;
}
init_nat_k (&kv, ip->dst_address, 0, 0, 0);
if (clib_bihash_search_8_8
(&sm->static_mapping_by_external, &kv, &value))
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
return 0;
}
m = pool_elt_at_index (sm->static_mappings, value.value);
new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
/* Create a new session */
s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
if (!s)
{
b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
nat_elog_warn ("create NAT session failed");
return 0;
}
s->ext_host_addr.as_u32 = ip->src_address.as_u32;
s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
s->out2in.addr.as_u32 = old_addr;
s->out2in.fib_index = rx_fib_index;
s->in2out.addr.as_u32 = new_addr;
s->in2out.fib_index = m->fib_index;
s->in2out.port = s->out2in.port = ip->protocol;
/* Add to lookup tables */
s_kv.value = s - tsm->sessions;
if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
nat_elog_notice ("out2in key add failed");
init_ed_kv (&s_kv, ip->dst_address, 0, ip->src_address, 0, m->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");
per_vrf_sessions_register_session (s, thread_index);
}
/* Update IP checksum */
sum = ip->checksum;
sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
ip->checksum = ip_csum_fold (sum);
vnet_buffer (b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
/* 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 s;
}
static inline uword
nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int is_multi_worker)
{
u32 n_left_from, *from;
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];
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
vlib_get_buffers (vm, from, b, n_left_from);
while (n_left_from > 0)
{
vlib_buffer_t *b0;
u32 sw_if_index0, rx_fib_index0, proto0, old_addr0, new_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;
b0 = *b;
b++;
/* Prefetch next iteration. */
if (PREDICT_TRUE (n_left_from >= 2))
{
vlib_buffer_t *p2;
p2 = *b;
vlib_prefetch_buffer_header (p2, LOAD);
CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
}
next[0] = vnet_buffer2 (b0)->nat.arc_next;
vnet_buffer (b0)->snat.flags = 0;
ip0 = vlib_buffer_get_current (b0);
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);
next[0] = 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))
{
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
goto trace0;
}
init_ed_k (&kv0, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_dst_port, ip0->src_address,
vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
ip0->protocol);
/* there is a stashed index in vnet_buffer2 from handoff node,
* see if we can use it */
if (is_multi_worker
&&
PREDICT_TRUE (!pool_is_free_index
(tsm->sessions,
vnet_buffer2 (b0)->nat.ed_out2in_nat_session_index)))
{
s0 = pool_elt_at_index (tsm->sessions,
vnet_buffer2 (b0)->
nat.ed_out2in_nat_session_index);
if (PREDICT_TRUE
(s0->out2in.addr.as_u32 == ip0->dst_address.as_u32
&& s0->out2in.port == vnet_buffer (b0)->ip.reass.l4_dst_port
&& s0->nat_proto == ip_proto_to_nat_proto (ip0->protocol)
&& s0->out2in.fib_index == rx_fib_index0
&& s0->ext_host_addr.as_u32 == ip0->src_address.as_u32
&& s0->ext_host_port ==
vnet_buffer (b0)->ip.reass.l4_src_port))
{
/* yes, this is the droid we're looking for */
goto skip_lookup;
}
}
// lookup for session
if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv0, &value0))
{
// session does not exist go slow path
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
goto trace0;
}
ASSERT (thread_index == ed_value_get_thread_index (&value0));
s0 =
pool_elt_at_index (tsm->sessions,
ed_value_get_session_index (&value0));
skip_lookup:
if (PREDICT_FALSE (per_vrf_sessions_is_expired (s0, thread_index)))
{
// session is closed, go slow path
nat_free_session_data (sm, s0, thread_index, 0);
nat_ed_session_delete (sm, s0, thread_index, 1);
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
goto trace0;
}
if (s0->tcp_closed_timestamp)
{
if (now >= s0->tcp_closed_timestamp)
{
// session is closed, go slow path, freed in slow path
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
}
else
{
// session in transitory timeout, drop
b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TCP_CLOSED];
next[0] = 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)
{
// session is closed, go slow path
nat_free_session_data (sm, s0, thread_index, 0);
nat_ed_session_delete (sm, s0, thread_index, 1);
next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
goto trace0;
}
old_addr0 = ip0->dst_address.as_u32;
new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.as_u32;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
s0->ext_host_nat_addr.as_u32, ip4_header_t,
src_address);
ip0->checksum = ip_csum_fold (sum0);
old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->dst_port = s0->in2out.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 (is_twice_nat_session (s0))
{
sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
s0->ext_host_nat_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.reass.l4_src_port,
s0->ext_host_nat_port, ip4_header_t,
length);
tcp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
tcp0->checksum = ip_csum_fold (sum0);
}
vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.tcp,
thread_index, sw_if_index0, 1);
if (nat44_set_tcp_session_state_o2i
(sm, now, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
vnet_buffer (b0)->ip.reass.tcp_ack_number,
vnet_buffer (b0)->ip.reass.tcp_seq_number, thread_index))
goto trace0;
}
else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
&& udp0->checksum)
{
new_port0 = udp0->dst_port = s0->in2out.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->src_address.as_u32,
s0->ext_host_nat_addr.as_u32, ip4_header_t,
dst_address);
sum0 =
ip_csum_update (sum0, vnet_buffer (b0)->ip.reass.l4_src_port,
s0->ext_host_nat_port, ip4_header_t, length);
udp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
udp0->checksum = ip_csum_fold (sum0);
vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.udp,
thread_index, sw_if_index0, 1);
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->dst_port = s0->in2out.port;
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
udp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
}
vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.udp,
thread_index, sw_if_index0, 1);
}
/* 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)))
{
nat44_ed_out2in_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next[0];
t->is_slow_path = 0;
if (s0)
t->session_index = s0 - tsm->sessions;
else
t->session_index = ~0;
}
if (next[0] == NAT_NEXT_DROP)
{
vlib_increment_simple_counter (&sm->counters.fastpath.
out2in_ed.drops, thread_index,
sw_if_index0, 1);
}
n_left_from--;
next++;
}
vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
frame->n_vectors);
return frame->n_vectors;
}
static inline uword
nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from;
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];
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
vlib_get_buffers (vm, from, b, n_left_from);
while (n_left_from > 0)
{
vlib_buffer_t *b0;
u32 sw_if_index0, rx_fib_index0, proto0, old_addr0, new_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;
lb_nat_type_t lb_nat0;
twice_nat_type_t twice_nat0;
u8 identity_nat0;
ip4_address_t sm_addr;
u16 sm_port;
u32 sm_fib_index;
b0 = *b;
next[0] = vnet_buffer2 (b0)->nat.arc_next;
vnet_buffer (b0)->snat.flags = 0;
ip0 = vlib_buffer_get_current (b0);
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);
next[0] = 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_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0,
thread_index, now, vm, node);
if (!sm->forwarding_enabled)
{
if (!s0)
next[0] = NAT_NEXT_DROP;
}
vlib_increment_simple_counter (&sm->counters.slowpath.
out2in_ed.other, thread_index,
sw_if_index0, 1);
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next[0] = icmp_out2in_ed_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next[0], now, thread_index, &s0);
vlib_increment_simple_counter (&sm->counters.slowpath.
out2in_ed.icmp, thread_index,
sw_if_index0, 1);
goto trace0;
}
init_ed_k (&kv0, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_dst_port, ip0->src_address,
vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
ip0->protocol);
s0 = NULL;
if (!clib_bihash_search_16_8 (&sm->out2in_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)
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
if (snat_static_mapping_match
(sm, ip0->dst_address,
vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
proto0, &sm_addr, &sm_port, &sm_fib_index, 1, 0,
&twice_nat0, &lb_nat0, &ip0->src_address, &identity_nat0))
{
/*
* 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_client))))
{
goto trace0;
}
if (!sm->forwarding_enabled)
{
b0->error =
node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
next[0] = NAT_NEXT_DROP;
}
else
{
if (next_src_nat
(sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
vnet_buffer (b0)->ip.reass.l4_dst_port,
thread_index, rx_fib_index0))
{
next[0] = NAT_NEXT_IN2OUT_ED_FAST_PATH;
goto trace0;
}
if (sm->num_workers > 1)
create_bypass_for_fwd_worker (sm, b0, ip0, rx_fib_index0);
else
create_bypass_for_fwd (sm, b0, ip0, rx_fib_index0,
thread_index);
}
goto trace0;
}
if (PREDICT_FALSE (identity_nat0))
goto trace0;
if ((proto0 == NAT_PROTOCOL_TCP)
&& !tcp_flags_is_init (vnet_buffer (b0)->ip.
reass.icmp_type_or_tcp_flags))
{
b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
next[0] = NAT_NEXT_DROP;
goto trace0;
}
/* Create session initiated by host from external network */
s0 = create_session_for_static_mapping_ed (sm, b0,
sm_addr, sm_port,
sm_fib_index,
ip0->dst_address,
vnet_buffer (b0)->
ip.reass.l4_dst_port,
rx_fib_index0, proto0,
node, rx_fib_index0,
thread_index, twice_nat0,
lb_nat0, now);
if (!s0)
{
next[0] = NAT_NEXT_DROP;
goto trace0;
}
}
old_addr0 = ip0->dst_address.as_u32;
new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.as_u32;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address);
if (PREDICT_FALSE (is_twice_nat_session (s0)))
sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
s0->ext_host_nat_addr.as_u32, ip4_header_t,
src_address);
ip0->checksum = ip_csum_fold (sum0);
old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->dst_port = s0->in2out.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 (is_twice_nat_session (s0))
{
sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
s0->ext_host_nat_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.reass.l4_src_port,
s0->ext_host_nat_port, ip4_header_t,
length);
tcp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
tcp0->checksum = ip_csum_fold (sum0);
}
vlib_increment_simple_counter (&sm->counters.slowpath.out2in_ed.tcp,
thread_index, sw_if_index0, 1);
if (nat44_set_tcp_session_state_o2i
(sm, now, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
vnet_buffer (b0)->ip.reass.tcp_ack_number,
vnet_buffer (b0)->ip.reass.tcp_seq_number, thread_index))
goto trace0;
}
else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
&& udp0->checksum)
{
new_port0 = udp0->dst_port = s0->in2out.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->src_address.as_u32,
s0->ext_host_nat_addr.as_u32,
ip4_header_t, dst_address);
sum0 =
ip_csum_update (sum0,
vnet_buffer (b0)->ip.reass.l4_src_port,
s0->ext_host_nat_port, ip4_header_t, length);
udp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
udp0->checksum = ip_csum_fold (sum0);
vlib_increment_simple_counter (&sm->counters.slowpath.out2in_ed.udp,
thread_index, sw_if_index0, 1);
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
new_port0 = udp0->dst_port = s0->in2out.port;
if (PREDICT_FALSE (is_twice_nat_session (s0)))
{
udp0->src_port = s0->ext_host_nat_port;
ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
}
}
vlib_increment_simple_counter (&sm->counters.slowpath.out2in_ed.udp,
thread_index, sw_if_index0, 1);
}
/* 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)))
{
nat44_ed_out2in_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next[0];
t->is_slow_path = 1;
if (s0)
t->session_index = s0 - tsm->sessions;
else
t->session_index = ~0;
}
if (next[0] == NAT_NEXT_DROP)
{
vlib_increment_simple_counter (&sm->counters.slowpath.
out2in_ed.drops, thread_index,
sw_if_index0, 1);
}
n_left_from--;
next++;
b++;
}
vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
frame->n_vectors);
return frame->n_vectors;
}
VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (snat_main.num_workers > 1)
{
return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 1);
}
else
{
return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 0);
}
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_out2in_node) = {
.name = "nat44-ed-out2in",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat44_ed_out2in_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
.error_strings = nat_out2in_ed_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
};
/* *INDENT-ON* */
VLIB_NODE_FN (nat44_ed_out2in_slowpath_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return nat44_ed_out2in_slow_path_node_fn_inline (vm, node, frame);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = {
.name = "nat44-ed-out2in-slowpath",
.vector_size = sizeof (u32),
.sibling_of = "nat-default",
.format_trace = format_nat44_ed_out2in_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
.error_strings = nat_out2in_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, "out2in next_index %d arc_next_index %d", t->next_index,
t->arc_next_index);
}
VLIB_NODE_FN (nat_pre_out2in_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_OUT2IN_ED_FAST_PATH);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat_pre_out2in_node) = {
.name = "nat-pre-out2in",
.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:
*/
