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gerrit.nordix.org / fdio / vpp / be360ee4d7d34954bd93ed852c9d7bf9109ce6fb / . / src / plugins / nat / in2out.c
blob: a448867cd4f195b573c5174cf9db71dc0c7b847b [file] [log] [blame]
/*
* 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
* @brief NAT44 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 <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 <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
typedef struct
{
u32 sw_if_index;
u32 next_index;
u32 session_index;
u32 is_slow_path;
} snat_in2out_trace_t;
/* packet trace format function */
static u8 *
format_snat_in2out_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 *);
snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
char *tag;
tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_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 u8 *
format_snat_in2out_fast_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 *);
snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
t->sw_if_index, t->next_index);
return s;
}
#define foreach_snat_in2out_error \
_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
_(IN2OUT_PACKETS, "good in2out packets processed") \
_(OUT_OF_PORTS, "out of ports") \
_(BAD_OUTSIDE_FIB, "outside VRF ID not found") \
_(BAD_ICMP_TYPE, "unsupported ICMP type") \
_(NO_TRANSLATION, "no translation") \
_(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
_(DROP_FRAGMENT, "drop fragment") \
_(TCP_PACKETS, "TCP packets") \
_(UDP_PACKETS, "UDP packets") \
_(ICMP_PACKETS, "ICMP packets") \
_(OTHER_PACKETS, "other protocol packets") \
_(FRAGMENTS, "fragments") \
_(CACHED_FRAGMENTS, "cached fragments") \
_(PROCESSED_FRAGMENTS, "processed fragments")
typedef enum
{
#define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
foreach_snat_in2out_error
#undef _
SNAT_IN2OUT_N_ERROR,
} snat_in2out_error_t;
static char *snat_in2out_error_strings[] = {
#define _(sym,string) string,
foreach_snat_in2out_error
#undef _
};
typedef enum
{
SNAT_IN2OUT_NEXT_LOOKUP,
SNAT_IN2OUT_NEXT_DROP,
SNAT_IN2OUT_NEXT_ICMP_ERROR,
SNAT_IN2OUT_NEXT_SLOW_PATH,
SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;
static inline int
snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
u32 rx_fib_index0, u32 thread_index)
{
udp_header_t *udp0 = ip4_next_header (ip0);
snat_session_key_t key0, sm0;
clib_bihash_kv_8_8_t kv0, value0;
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
key0.fib_index = sm->outside_fib_index;
kv0.key = key0.as_u64;
/* NAT packet aimed at external address if */
/* has active sessions */
if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
&value0))
{
/* or is static mappings */
if (!snat_static_mapping_match (sm, key0, &sm0, 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_index0, ip0, proto0,
rx_fib_index0);
}
static inline int
nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0,
u32 proto0, u16 src_port, u16 dst_port,
u32 thread_index, u32 sw_if_index)
{
snat_session_key_t key0;
clib_bihash_kv_8_8_t kv0, value0;
snat_interface_t *i;
/* src NAT check */
key0.addr = ip0->src_address;
key0.port = src_port;
key0.protocol = proto0;
key0.fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
kv0.key = key0.as_u64;
if (!clib_bihash_search_8_8
(&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
return 1;
/* dst NAT check */
key0.addr = ip0->dst_address;
key0.port = dst_port;
key0.protocol = proto0;
kv0.key = key0.as_u64;
if (!clib_bihash_search_8_8
(&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
{
/* hairpinning */
/* *INDENT-OFF* */
pool_foreach (i, sm->output_feature_interfaces,
({
if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index))
return 0;
}));
/* *INDENT-ON* */
return 1;
}
return 0;
}
#ifndef CLIB_MARCH_VARIANT
int
nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_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;
snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
ctx->thread_index);
clib_bihash_kv_8_8_t s_kv;
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)
{
s_kv.key = s->out2in.as_u64;
if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
nat_elog_warn ("out2in key del failed");
snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
s->in2out.addr.as_u32,
s->out2in.addr.as_u32,
s->in2out.protocol,
s->in2out.port,
s->out2in.port,
s->in2out.fib_index);
nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
&s->in2out.addr, s->in2out.port,
&s->out2in.addr, s->out2in.port,
s->in2out.protocol);
nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
ctx->thread_index);
if (!snat_is_session_static (s))
snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
&s->out2in);
nat44_delete_session (sm, s, ctx->thread_index);
return 1;
}
return 0;
}
#endif
static u32
slow_path (snat_main_t * sm, vlib_buffer_t * b0,
ip4_header_t * ip0,
u32 rx_fib_index0,
snat_session_key_t * key0,
snat_session_t ** sessionp,
vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now)
{
snat_user_t *u;
snat_session_t *s = 0;
clib_bihash_kv_8_8_t kv0;
snat_session_key_t key1;
u8 is_sm = 0;
nat_outside_fib_t *outside_fib;
fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
u8 identity_nat;
fib_prefix_t pfx = {
.fp_proto = FIB_PROTOCOL_IP4,
.fp_len = 32,
.fp_addr = {
.ip4.as_u32 = ip0->dst_address.as_u32,
},
};
nat44_is_idle_session_ctx_t ctx0;
if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
nat_elog_notice ("maximum sessions exceeded");
return SNAT_IN2OUT_NEXT_DROP;
}
key1.protocol = key0->protocol;
/* First try to match static mapping by local address and port */
if (snat_static_mapping_match
(sm, *key0, &key1, 0, 0, 0, 0, 0, &identity_nat))
{
/* Try to create dynamic translation */
if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
thread_index, &key1,
sm->port_per_thread,
sm->per_thread_data
[thread_index].snat_thread_index))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
return SNAT_IN2OUT_NEXT_DROP;
}
}
else
{
if (PREDICT_FALSE (identity_nat))
{
*sessionp = s;
return next0;
}
is_sm = 1;
}
u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
thread_index);
if (!u)
{
nat_elog_warn ("create NAT user failed");
return SNAT_IN2OUT_NEXT_DROP;
}
s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
if (!s)
{
nat44_delete_user_with_no_session (sm, u, thread_index);
nat_elog_warn ("create NAT session failed");
return SNAT_IN2OUT_NEXT_DROP;
}
if (is_sm)
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
user_session_increment (sm, u, is_sm);
s->in2out = *key0;
s->out2in = key1;
s->out2in.protocol = key0->protocol;
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:
/* *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)
{
s->out2in.fib_index = outside_fib->fib_index;
break;
}
}
}
/* *INDENT-ON* */
break;
}
s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port;
*sessionp = s;
/* Add to translation hashes */
ctx0.now = now;
ctx0.thread_index = thread_index;
kv0.key = s->in2out.as_u64;
kv0.value = s - sm->per_thread_data[thread_index].sessions;
if (clib_bihash_add_or_overwrite_stale_8_8
(&sm->per_thread_data[thread_index].in2out, &kv0,
nat44_i2o_is_idle_session_cb, &ctx0))
nat_elog_notice ("in2out key add failed");
kv0.key = s->out2in.as_u64;
kv0.value = s - sm->per_thread_data[thread_index].sessions;
if (clib_bihash_add_or_overwrite_stale_8_8
(&sm->per_thread_data[thread_index].out2in, &kv0,
nat44_o2i_is_idle_session_cb, &ctx0))
nat_elog_notice ("out2in key add failed");
/* log NAT event */
snat_ipfix_logging_nat44_ses_create (thread_index,
s->in2out.addr.as_u32,
s->out2in.addr.as_u32,
s->in2out.protocol,
s->in2out.port,
s->out2in.port, s->in2out.fib_index);
nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
&s->in2out.addr, s->in2out.port, &s->out2in.addr,
s->out2in.port, s->in2out.protocol);
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->in2out.protocol, s->in2out.fib_index, s->flags,
thread_index, 0);
return next0;
}
#ifndef CLIB_MARCH_VARIANT
static_always_inline
snat_in2out_error_t icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0,
snat_session_key_t * p_key0)
{
icmp46_header_t *icmp0;
snat_session_key_t key0;
icmp_echo_header_t *echo0, *inner_echo0 = 0;
ip4_header_t *inner_ip0 = 0;
void *l4_header = 0;
icmp46_header_t *inner_icmp0;
icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
echo0 = (icmp_echo_header_t *) (icmp0 + 1);
if (!icmp_type_is_error_message
(vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
{
key0.protocol = NAT_PROTOCOL_ICMP;
key0.addr = ip0->src_address;
key0.port = vnet_buffer (b)->ip.reass.l4_src_port; // TODO fixme should this be dst port?
}
else
{
inner_ip0 = (ip4_header_t *) (echo0 + 1);
l4_header = ip4_next_header (inner_ip0);
key0.protocol = ip_proto_to_nat_proto (inner_ip0->protocol);
key0.addr = inner_ip0->dst_address;
switch (key0.protocol)
{
case NAT_PROTOCOL_ICMP:
inner_icmp0 = (icmp46_header_t *) l4_header;
inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
key0.port = inner_echo0->identifier;
break;
case NAT_PROTOCOL_UDP:
case NAT_PROTOCOL_TCP:
key0.port = ((tcp_udp_header_t *) l4_header)->dst_port;
break;
default:
return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
}
}
*p_key0 = key0;
return -1; /* success */
}
/**
* Get address and port values to be used for ICMP packet translation
* and create session if needed
*
* @param[in,out] sm NAT main
* @param[in,out] node NAT node runtime
* @param[in] thread_index thread index
* @param[in,out] b0 buffer containing packet to be translated
* @param[in,out] ip0 ip header
* @param[out] p_proto protocol used for matching
* @param[out] p_value address and port after NAT translation
* @param[out] p_dont_translate if packet should not be translated
* @param d optional parameter
* @param e optional parameter
*/
u32
icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, u8 * p_proto,
snat_session_key_t * p_value,
u8 * p_dont_translate, void *d, void *e)
{
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
u32 sw_if_index0;
u32 rx_fib_index0;
snat_session_key_t key0;
snat_session_t *s0 = 0;
u8 dont_translate = 0;
clib_bihash_kv_8_8_t kv0, value0;
u32 next0 = ~0;
int err;
vlib_main_t *vm = vlib_get_main ();
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
err = icmp_get_key (b0, ip0, &key0);
if (err != -1)
{
b0->error = node->errors[err];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&tsm->in2out, &kv0, &value0))
{
if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
{
if (PREDICT_FALSE (nat_not_translate_output_feature (sm, ip0,
key0.protocol,
key0.port,
key0.port,
thread_index,
sw_if_index0)))
{
dont_translate = 1;
goto out;
}
}
else
{
if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
ip0, NAT_PROTOCOL_ICMP,
rx_fib_index0,
thread_index)))
{
dont_translate = 1;
goto out;
}
}
if (PREDICT_FALSE
(icmp_type_is_error_message
(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
thread_index, vlib_time_now (vm));
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto out;
if (!s0)
{
dont_translate = 1;
goto out;
}
}
else
{
if (PREDICT_FALSE
(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_request
&& vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_reply
&& !icmp_type_is_error_message (vnet_buffer (b0)->ip.
reass.icmp_type_or_tcp_flags)))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
s0 = pool_elt_at_index (tsm->sessions, value0.value);
}
out:
*p_proto = key0.protocol;
if (s0)
*p_value = s0->out2in;
*p_dont_translate = dont_translate;
if (d)
*(snat_session_t **) d = s0;
return next0;
}
#endif
#ifndef CLIB_MARCH_VARIANT
/**
* Get address and port values to be used for ICMP packet translation
*
* @param[in] sm NAT main
* @param[in,out] node NAT node runtime
* @param[in] thread_index thread index
* @param[in,out] b0 buffer containing packet to be translated
* @param[in,out] ip0 ip header
* @param[out] p_proto protocol used for matching
* @param[out] p_value address and port after NAT translation
* @param[out] p_dont_translate if packet should not be translated
* @param d optional parameter
* @param e optional parameter
*/
u32
icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, u8 * p_proto,
snat_session_key_t * p_value,
u8 * p_dont_translate, void *d, void *e)
{
u32 sw_if_index0;
u32 rx_fib_index0;
snat_session_key_t key0;
snat_session_key_t sm0;
u8 dont_translate = 0;
u8 is_addr_only;
u32 next0 = ~0;
int err;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
err = icmp_get_key (b0, ip0, &key0);
if (err != -1)
{
b0->error = node->errors[err];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out2;
}
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match
(sm, key0, &sm0, 0, &is_addr_only, 0, 0, 0, 0))
{
if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
IP_PROTOCOL_ICMP,
rx_fib_index0)))
{
dont_translate = 1;
goto out;
}
if (icmp_type_is_error_message
(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
{
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
if (PREDICT_FALSE
(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
&& (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
ICMP4_echo_reply || !is_addr_only)
&& !icmp_type_is_error_message (vnet_buffer (b0)->ip.
reass.icmp_type_or_tcp_flags)))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
out:
*p_value = sm0;
out2:
*p_proto = key0.protocol;
*p_dont_translate = dont_translate;
return next0;
}
#endif
#ifndef CLIB_MARCH_VARIANT
u32
icmp_in2out (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, u32 thread_index, void *d, void *e)
{
vlib_main_t *vm = vlib_get_main ();
snat_session_key_t sm0;
u8 protocol;
icmp_echo_header_t *echo0, *inner_echo0 = 0;
ip4_header_t *inner_ip0;
void *l4_header = 0;
icmp46_header_t *inner_icmp0;
u8 dont_translate;
u32 new_addr0, old_addr0;
u16 old_id0, new_id0;
u16 old_checksum0, new_checksum0;
ip_csum_t sum0;
u16 checksum0;
u32 next0_tmp;
echo0 = (icmp_echo_header_t *) (icmp0 + 1);
next0_tmp = sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0,
&protocol, &sm0, &dont_translate, d,
e);
if (next0_tmp != ~0)
next0 = next0_tmp;
if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
goto out;
if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
{
sum0 =
ip_incremental_checksum_buffer (vm, b0,
(u8 *) icmp0 -
(u8 *) vlib_buffer_get_current (b0),
ntohs (ip0->length) -
ip4_header_bytes (ip0), 0);
checksum0 = ~ip_csum_fold (sum0);
if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
{
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
}
old_addr0 = ip0->src_address.as_u32;
new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
src_address /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
if (icmp0->checksum == 0)
icmp0->checksum = 0xffff;
if (!icmp_type_is_error_message (icmp0->type))
{
new_id0 = sm0.port;
if (PREDICT_FALSE (new_id0 != echo0->identifier))
{
old_id0 = echo0->identifier;
new_id0 = sm0.port;
echo0->identifier = new_id0;
sum0 = icmp0->checksum;
sum0 =
ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
identifier);
icmp0->checksum = ip_csum_fold (sum0);
}
}
else
{
inner_ip0 = (ip4_header_t *) (echo0 + 1);
l4_header = ip4_next_header (inner_ip0);
if (!ip4_header_checksum_is_valid (inner_ip0))
{
next0 = SNAT_IN2OUT_NEXT_DROP;
goto out;
}
/* update inner destination IP address */
old_addr0 = inner_ip0->dst_address.as_u32;
inner_ip0->dst_address = sm0.addr;
new_addr0 = inner_ip0->dst_address.as_u32;
sum0 = icmp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address /* changed member */ );
icmp0->checksum = ip_csum_fold (sum0);
/* update inner IP header checksum */
old_checksum0 = inner_ip0->checksum;
sum0 = inner_ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
dst_address /* changed member */ );
inner_ip0->checksum = ip_csum_fold (sum0);
new_checksum0 = inner_ip0->checksum;
sum0 = icmp0->checksum;
sum0 =
ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
checksum);
icmp0->checksum = ip_csum_fold (sum0);
switch (protocol)
{
case NAT_PROTOCOL_ICMP:
inner_icmp0 = (icmp46_header_t *) l4_header;
inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
old_id0 = inner_echo0->identifier;
new_id0 = sm0.port;
inner_echo0->identifier = new_id0;
sum0 = icmp0->checksum;
sum0 =
ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
identifier);
icmp0->checksum = ip_csum_fold (sum0);
break;
case NAT_PROTOCOL_UDP:
case NAT_PROTOCOL_TCP:
old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
new_id0 = sm0.port;
((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
sum0 = icmp0->checksum;
sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
dst_port);
icmp0->checksum = ip_csum_fold (sum0);
break;
default:
ASSERT (0);
}
}
}
if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
{
if (sm->deterministic ||
0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0,
sm->endpoint_dependent))
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
}
out:
return next0;
}
#endif
static inline u32
icmp_in2out_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 != SNAT_IN2OUT_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_in2out_sm_unknown_proto (snat_main_t * sm,
vlib_buffer_t * b,
ip4_header_t * ip, u32 rx_fib_index)
{
clib_bihash_kv_8_8_t kv, value;
snat_static_mapping_t *m;
snat_session_key_t m_key;
u32 old_addr, new_addr;
ip_csum_t sum;
m_key.addr = ip->src_address;
m_key.port = 0;
m_key.protocol = 0;
m_key.fib_index = rx_fib_index;
kv.key = m_key.as_u64;
if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
return 1;
m = pool_elt_at_index (sm->static_mappings, value.value);
old_addr = ip->src_address.as_u32;
new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
sum = ip->checksum;
sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
ip->checksum = ip_csum_fold (sum);
/* Hairpinning */
if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
{
vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
nat_hairpinning_sm_unknown_proto (sm, b, ip);
}
return 0;
}
static inline uword
snat_in2out_node_fn_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int is_slow_path,
int is_output_feature)
{
u32 n_left_from, *from, *to_next;
snat_in2out_next_t next_index;
u32 pkts_processed = 0;
snat_main_t *sm = &snat_main;
f64 now = vlib_time_now (vm);
u32 stats_node_index;
u32 thread_index = vm->thread_index;
u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
0, fragments = 0;
stats_node_index = is_slow_path ? sm->in2out_slowpath_node_index :
sm->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 >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
u32 next0, next1;
u32 sw_if_index0, sw_if_index1;
ip4_header_t *ip0, *ip1;
ip_csum_t sum0, sum1;
u32 new_addr0, old_addr0, new_addr1, old_addr1;
u16 old_port0, new_port0, old_port1, new_port1;
udp_header_t *udp0, *udp1;
tcp_header_t *tcp0, *tcp1;
icmp46_header_t *icmp0, *icmp1;
snat_session_key_t key0, key1;
u32 rx_fib_index0, rx_fib_index1;
u32 proto0, proto1;
snat_session_t *s0 = 0, *s1 = 0;
clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
u32 iph_offset0 = 0, iph_offset1 = 0;
/* Prefetch next iteration. */
{
vlib_buffer_t *p2, *p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
}
/* speculatively enqueue b0 and b1 to the current next frame */
to_next[0] = bi0 = from[0];
to_next[1] = bi1 = from[1];
from += 2;
to_next += 2;
n_left_from -= 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
if (is_output_feature)
iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
iph_offset0);
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
icmp0 = (icmp46_header_t *) udp0;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
sw_if_index0);
next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
goto trace00;
}
proto0 = ip_proto_to_nat_proto (ip0->protocol);
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
if (nat_in2out_sm_unknown_proto
(sm, b0, ip0, rx_fib_index0))
{
next0 = SNAT_IN2OUT_NEXT_DROP;
b0->error =
node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
}
other_packets++;
goto trace00;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
node, next0, now, thread_index, &s0);
icmp_packets++;
goto trace00;
}
}
else
{
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
}
key0.addr = ip0->src_address;
key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
key0.protocol = proto0;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (PREDICT_FALSE
(clib_bihash_search_8_8
(&sm->per_thread_data[thread_index].in2out, &kv0,
&value0) != 0))
{
if (is_slow_path)
{
if (is_output_feature)
{
if (PREDICT_FALSE
(nat_not_translate_output_feature
(sm, ip0, proto0,
vnet_buffer (b0)->ip.reass.l4_src_port,
vnet_buffer (b0)->ip.reass.l4_dst_port,
thread_index, sw_if_index0)))
goto trace00;
/*
* 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 trace00;
}
else
{
if (PREDICT_FALSE
(snat_not_translate
(sm, node, sw_if_index0, ip0, proto0,
rx_fib_index0, thread_index)))
goto trace00;
}
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace00;
if (PREDICT_FALSE (!s0))
goto trace00;
}
else
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
}
else
s0 =
pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
value0.value);
b0->flags |= VNET_BUFFER_F_IS_NATED;
old_addr0 = ip0->src_address.as_u32;
ip0->src_address = s0->out2in.addr;
new_addr0 = ip0->src_address.as_u32;
if (!is_output_feature)
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
src_address /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
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 /* changed member */ );
sum0 = ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
mss_clamping (sm, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
tcp_packets++;
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
udp0->src_port = s0->out2in.port;
if (PREDICT_FALSE (udp0->checksum))
{
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
new_port0 = udp0->src_port;
sum0 = udp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
);
sum0 =
ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
udp0->checksum = ip_csum_fold (sum0);
}
}
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);
trace00:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_in2out_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->is_slow_path = is_slow_path;
t->sw_if_index = sw_if_index0;
t->next_index = next0;
t->session_index = ~0;
if (s0)
t->session_index =
s0 - sm->per_thread_data[thread_index].sessions;
}
pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
if (is_output_feature)
iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;
ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
iph_offset1);
udp1 = ip4_next_header (ip1);
tcp1 = (tcp_header_t *) udp1;
icmp1 = (icmp46_header_t *) udp1;
sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
sw_if_index1);
if (PREDICT_FALSE (ip1->ttl == 1))
{
vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
goto trace01;
}
proto1 = ip_proto_to_nat_proto (ip1->protocol);
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
{
if (nat_in2out_sm_unknown_proto
(sm, b1, ip1, rx_fib_index1))
{
next1 = SNAT_IN2OUT_NEXT_DROP;
b1->error =
node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
}
other_packets++;
goto trace01;
}
if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
{
next1 = icmp_in2out_slow_path
(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
next1, now, thread_index, &s1);
icmp_packets++;
goto trace01;
}
}
else
{
if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
}
key1.addr = ip1->src_address;
key1.port = vnet_buffer (b1)->ip.reass.l4_src_port;
key1.protocol = proto1;
key1.fib_index = rx_fib_index1;
kv1.key = key1.as_u64;
if (PREDICT_FALSE
(clib_bihash_search_8_8
(&sm->per_thread_data[thread_index].in2out, &kv1,
&value1) != 0))
{
if (is_slow_path)
{
if (is_output_feature)
{
if (PREDICT_FALSE
(nat_not_translate_output_feature
(sm, ip1, proto1,
vnet_buffer (b1)->ip.reass.l4_src_port,
vnet_buffer (b1)->ip.reass.l4_dst_port,
thread_index, sw_if_index1)))
goto trace01;
/*
* Send DHCP packets to the ipv4 stack, or we won't
* be able to use dhcp client on the outside interface
*/
if (PREDICT_FALSE
(proto1 == NAT_PROTOCOL_UDP
&& (vnet_buffer (b1)->ip.reass.l4_dst_port ==
clib_host_to_net_u16
(UDP_DST_PORT_dhcp_to_server))
&& ip1->dst_address.as_u32 == 0xffffffff))
goto trace01;
}
else
{
if (PREDICT_FALSE
(snat_not_translate
(sm, node, sw_if_index1, ip1, proto1,
rx_fib_index1, thread_index)))
goto trace01;
}
next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
&s1, node, next1, thread_index, now);
if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
goto trace01;
if (PREDICT_FALSE (!s1))
goto trace01;
}
else
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
}
else
s1 =
pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
value1.value);
b1->flags |= VNET_BUFFER_F_IS_NATED;
old_addr1 = ip1->src_address.as_u32;
ip1->src_address = s1->out2in.addr;
new_addr1 = ip1->src_address.as_u32;
if (!is_output_feature)
vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
sum1 = ip1->checksum;
sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
ip4_header_t,
src_address /* changed member */ );
ip1->checksum = ip_csum_fold (sum1);
if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
new_port1 = udp1->src_port = s1->out2in.port;
sum1 = tcp1->checksum;
sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
ip4_header_t,
dst_address /* changed member */ );
sum1 = ip_csum_update (sum1, old_port1, new_port1,
ip4_header_t /* cheat */ ,
length /* changed member */ );
mss_clamping (sm, tcp1, &sum1);
tcp1->checksum = ip_csum_fold (sum1);
}
tcp_packets++;
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
udp1->src_port = s1->out2in.port;
if (PREDICT_FALSE (udp1->checksum))
{
old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
new_port1 = udp1->src_port;
sum1 = udp1->checksum;
sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */
);
sum1 =
ip_csum_update (sum1, old_port1, new_port1,
ip4_header_t /* cheat */ ,
length /* changed member */ );
udp1->checksum = ip_csum_fold (sum1);
}
}
udp_packets++;
}
/* Accounting */
nat44_session_update_counters (s1, now,
vlib_buffer_length_in_chain (vm, b1),
thread_index);
/* Per-user LRU list maintenance */
nat44_session_update_lru (sm, s1, thread_index);
trace01:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b1->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_in2out_trace_t *t =
vlib_add_trace (vm, node, b1, sizeof (*t));
t->sw_if_index = sw_if_index1;
t->next_index = next1;
t->session_index = ~0;
if (s1)
t->session_index =
s1 - sm->per_thread_data[thread_index].sessions;
}
pkts_processed += next1 == SNAT_IN2OUT_NEXT_LOOKUP;
/* verify speculative enqueues, maybe switch current next frame */
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0;
u32 sw_if_index0;
ip4_header_t *ip0;
ip_csum_t sum0;
u32 new_addr0, old_addr0;
u16 old_port0, new_port0;
udp_header_t *udp0;
tcp_header_t *tcp0;
icmp46_header_t *icmp0;
snat_session_key_t key0;
u32 rx_fib_index0;
u32 proto0;
snat_session_t *s0 = 0;
clib_bihash_kv_8_8_t kv0, value0;
u32 iph_offset0 = 0;
/* 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);
next0 = SNAT_IN2OUT_NEXT_LOOKUP;
if (is_output_feature)
iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
iph_offset0);
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
icmp0 = (icmp46_header_t *) udp0;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
goto trace0;
}
proto0 = ip_proto_to_nat_proto (ip0->protocol);
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
if (nat_in2out_sm_unknown_proto
(sm, b0, ip0, rx_fib_index0))
{
next0 = SNAT_IN2OUT_NEXT_DROP;
b0->error =
node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
}
other_packets++;
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, now, thread_index, &s0);
icmp_packets++;
goto trace0;
}
}
else
{
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
}
key0.addr = ip0->src_address;
key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
key0.protocol = proto0;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8
(&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
{
if (is_slow_path)
{
if (is_output_feature)
{
if (PREDICT_FALSE
(nat_not_translate_output_feature
(sm, ip0, proto0,
vnet_buffer (b0)->ip.reass.l4_src_port,
vnet_buffer (b0)->ip.reass.l4_dst_port,
thread_index, sw_if_index0)))
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
(snat_not_translate
(sm, node, sw_if_index0, ip0, proto0,
rx_fib_index0, thread_index)))
goto trace0;
}
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0, thread_index, now);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace0;
if (PREDICT_FALSE (!s0))
goto trace0;
}
else
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
}
else
s0 =
pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
value0.value);
b0->flags |= VNET_BUFFER_F_IS_NATED;
old_addr0 = ip0->src_address.as_u32;
ip0->src_address = s0->out2in.addr;
new_addr0 = ip0->src_address.as_u32;
if (!is_output_feature)
vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
src_address /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
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 /* changed member */ );
sum0 = ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
mss_clamping (sm, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
tcp_packets++;
}
else
{
if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
{
udp0->src_port = s0->out2in.port;
if (PREDICT_FALSE (udp0->checksum))
{
old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
new_port0 = udp0->src_port;
sum0 = udp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
);
sum0 =
ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
udp0->checksum = ip_csum_fold (sum0);
}
}
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)))
{
snat_in2out_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->is_slow_path = is_slow_path;
t->sw_if_index = sw_if_index0;
t->next_index = next0;
t->session_index = ~0;
if (s0)
t->session_index =
s0 - sm->per_thread_data[thread_index].sessions;
}
pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
/* 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,
SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
pkts_processed);
vlib_node_increment_counter (vm, stats_node_index,
SNAT_IN2OUT_ERROR_TCP_PACKETS, tcp_packets);
vlib_node_increment_counter (vm, stats_node_index,
SNAT_IN2OUT_ERROR_UDP_PACKETS, udp_packets);
vlib_node_increment_counter (vm, stats_node_index,
SNAT_IN2OUT_ERROR_ICMP_PACKETS, icmp_packets);
vlib_node_increment_counter (vm, stats_node_index,
SNAT_IN2OUT_ERROR_OTHER_PACKETS,
other_packets);
vlib_node_increment_counter (vm, stats_node_index,
SNAT_IN2OUT_ERROR_FRAGMENTS, fragments);
return frame->n_vectors;
}
VLIB_NODE_FN (snat_in2out_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_node) = {
.name = "nat44-in2out",
.vector_size = sizeof (u32),
.format_trace = format_snat_in2out_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_in2out_error_strings),
.error_strings = snat_in2out_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_IN2OUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_IN2OUT_NEXT_DROP] = "error-drop",
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (snat_in2out_output_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_output_node) = {
.name = "nat44-in2out-output",
.vector_size = sizeof (u32),
.format_trace = format_snat_in2out_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_in2out_error_strings),
.error_strings = snat_in2out_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_IN2OUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_IN2OUT_NEXT_DROP] = "error-drop",
[SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (snat_in2out_slowpath_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
.name = "nat44-in2out-slowpath",
.vector_size = sizeof (u32),
.format_trace = format_snat_in2out_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_in2out_error_strings),
.error_strings = snat_in2out_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_IN2OUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_IN2OUT_NEXT_DROP] = "error-drop",
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (snat_in2out_output_slowpath_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
.name = "nat44-in2out-output-slowpath",
.vector_size = sizeof (u32),
.format_trace = format_snat_in2out_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_in2out_error_strings),
.error_strings = snat_in2out_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_IN2OUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_IN2OUT_NEXT_DROP] = "error-drop",
[SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
snat_in2out_next_t next_index;
u32 pkts_processed = 0;
snat_main_t *sm = &snat_main;
u32 stats_node_index;
stats_node_index = sm->in2out_fast_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;
u32 sw_if_index0;
ip4_header_t *ip0;
ip_csum_t sum0;
u32 new_addr0, old_addr0;
u16 old_port0, new_port0;
udp_header_t *udp0;
tcp_header_t *tcp0;
icmp46_header_t *icmp0;
snat_session_key_t key0, sm0;
u32 proto0;
u32 rx_fib_index0;
/* 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);
next0 = SNAT_IN2OUT_NEXT_LOOKUP;
ip0 = vlib_buffer_get_current (b0);
udp0 = ip4_next_header (ip0);
tcp0 = (tcp_header_t *) udp0;
icmp0 = (icmp46_header_t *) udp0;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
rx_fib_index0 =
ip4_fib_table_get_index_for_sw_if_index (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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
goto trace0;
}
proto0 = ip_proto_to_nat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
goto trace0;
if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
rx_fib_index0, node, next0, ~0, 0, 0);
goto trace0;
}
key0.addr = ip0->src_address;
key0.protocol = proto0;
key0.port = udp0->src_port;
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match (sm, key0, &sm0, 0, 0, 0, 0, 0, 0))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
next0 = SNAT_IN2OUT_NEXT_DROP;
goto trace0;
}
new_addr0 = sm0.addr.as_u32;
new_port0 = sm0.port;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
old_addr0 = ip0->src_address.as_u32;
ip0->src_address.as_u32 = new_addr0;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
src_address /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
if (PREDICT_FALSE (new_port0 != udp0->dst_port))
{
old_port0 = udp0->src_port;
udp0->src_port = new_port0;
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
sum0 = tcp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_address /* changed member */ );
sum0 = ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
mss_clamping (sm, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
else if (udp0->checksum)
{
sum0 = udp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_address /* changed member */ );
sum0 = ip_csum_update (sum0, old_port0, new_port0,
ip4_header_t /* cheat */ ,
length /* changed member */ );
udp0->checksum = ip_csum_fold (sum0);
}
}
else
{
if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
{
sum0 = tcp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_address /* changed member */ );
mss_clamping (sm, tcp0, &sum0);
tcp0->checksum = ip_csum_fold (sum0);
}
else if (udp0->checksum)
{
sum0 = udp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_address /* changed member */ );
udp0->checksum = ip_csum_fold (sum0);
}
}
/* Hairpinning */
snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, 0);
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_in2out_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
}
pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
/* 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,
SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
pkts_processed);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
.name = "nat44-in2out-fast",
.vector_size = sizeof (u32),
.format_trace = format_snat_in2out_fast_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_in2out_error_strings),
.error_strings = snat_in2out_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_IN2OUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_IN2OUT_NEXT_DROP] = "error-drop",
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/