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vpp/plugins/snat-plugin/snat/in2out.c
Matus Fabian 7e46a4dc84 VPP-446: 1:1 SNAT Inside overlapping interfaces 
Change-Id: Idabf89bd27ee95769da16331a6bd1439497b2765
Signed-off-by: Matus Fabian <matfabia@cisco.com>
2016-10-13 09:54:52 +00:00

1276 lines
43 KiB
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/*
* 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.
*/
#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 <snat/snat.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 ? "SNAT_IN2OUT_SLOW_PATH" : "SNAT_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, "SANT_IN2OUT_FAST: sw_if_index %d, next index %d",
t->sw_if_index, t->next_index);
return s;
}
vlib_node_registration_t snat_in2out_node;
vlib_node_registration_t snat_in2out_slowpath_node;
vlib_node_registration_t snat_in2out_fast_node;
#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, "icmp type not echo-request") \
_(NO_TRANSLATION, "No translation")
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_SLOW_PATH,
SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;
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)
{
snat_user_t *u;
snat_user_key_t user_key;
snat_session_t *s;
clib_bihash_kv_8_8_t kv0, value0;
u32 oldest_per_user_translation_list_index;
dlist_elt_t * oldest_per_user_translation_list_elt;
dlist_elt_t * per_user_translation_list_elt;
dlist_elt_t * per_user_list_head_elt;
u32 session_index;
snat_session_key_t key1;
u32 address_index = ~0;
u32 outside_fib_index;
uword * p;
p = hash_get (sm->ip4_main->fib_index_by_table_id, sm->outside_vrf_id);
if (! p)
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_OUTSIDE_FIB];
return SNAT_IN2OUT_NEXT_DROP;
}
outside_fib_index = p[0];
user_key.addr = ip0->src_address;
user_key.fib_index = rx_fib_index0;
kv0.key = user_key.as_u64;
/* Ever heard of the "user" = src ip4 address before? */
if (clib_bihash_search_8_8 (&sm->user_hash, &kv0, &value0))
{
/* no, make a new one */
pool_get (sm->users, u);
memset (u, 0, sizeof (*u));
u->addr = ip0->src_address;
pool_get (sm->list_pool, per_user_list_head_elt);
u->sessions_per_user_list_head_index = per_user_list_head_elt -
sm->list_pool;
clib_dlist_init (sm->list_pool, u->sessions_per_user_list_head_index);
kv0.value = u - sm->users;
/* add user */
clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */);
}
else
{
u = pool_elt_at_index (sm->users, value0.value);
}
/* Over quota? Recycle the least recently used dynamic translation */
if (u->nsessions >= sm->max_translations_per_user)
{
/* Remove the oldest dynamic translation */
do {
oldest_per_user_translation_list_index =
clib_dlist_remove_head
(sm->list_pool, u->sessions_per_user_list_head_index);
ASSERT (oldest_per_user_translation_list_index != ~0);
/* add it back to the end of the LRU list */
clib_dlist_addtail (sm->list_pool,
u->sessions_per_user_list_head_index,
oldest_per_user_translation_list_index);
/* Get the list element */
oldest_per_user_translation_list_elt =
pool_elt_at_index (sm->list_pool,
oldest_per_user_translation_list_index);
/* Get the session index from the list element */
session_index = oldest_per_user_translation_list_elt->value;
/* Get the session */
s = pool_elt_at_index (sm->sessions, session_index);
} while (!snat_is_session_static (s));
/* Remove in2out, out2in keys */
kv0.key = s->in2out.as_u64;
if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 0 /* is_add */))
clib_warning ("in2out key delete failed");
kv0.key = s->out2in.as_u64;
if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 0 /* is_add */))
clib_warning ("out2in key delete failed");
snat_free_outside_address_and_port
(sm, &s->out2in, s->outside_address_index);
s->outside_address_index = ~0;
if (snat_alloc_outside_address_and_port (sm, &key1, &address_index))
{
ASSERT(0);
b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
return SNAT_IN2OUT_NEXT_DROP;
}
s->outside_address_index = address_index;
}
else
{
u8 static_mapping = 1;
/* First try to match static mapping by local address and port */
if (snat_static_mapping_match (sm, *key0, &key1, 0))
{
static_mapping = 0;
/* Try to create dynamic translation */
if (snat_alloc_outside_address_and_port (sm, &key1, &address_index))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
return SNAT_IN2OUT_NEXT_DROP;
}
}
/* Create a new session */
pool_get (sm->sessions, s);
memset (s, 0, sizeof (*s));
s->outside_address_index = address_index;
if (static_mapping)
{
u->nstaticsessions++;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
}
else
{
u->nsessions++;
}
/* Create list elts */
pool_get (sm->list_pool, per_user_translation_list_elt);
clib_dlist_init (sm->list_pool, per_user_translation_list_elt -
sm->list_pool);
per_user_translation_list_elt->value = s - sm->sessions;
s->per_user_index = per_user_translation_list_elt - sm->list_pool;
s->per_user_list_head_index = u->sessions_per_user_list_head_index;
clib_dlist_addtail (sm->list_pool, s->per_user_list_head_index,
per_user_translation_list_elt - sm->list_pool);
}
s->in2out = *key0;
s->out2in = key1;
s->out2in.protocol = key0->protocol;
s->out2in.fib_index = outside_fib_index;
*sessionp = s;
/* Add to translation hashes */
kv0.key = s->in2out.as_u64;
kv0.value = s - sm->sessions;
if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 1 /* is_add */))
clib_warning ("in2out key add failed");
kv0.key = s->out2in.as_u64;
kv0.value = s - sm->sessions;
if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */))
clib_warning ("out2in key add failed");
return next0;
}
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)
{
snat_session_key_t key0;
icmp_echo_header_t *echo0;
clib_bihash_kv_8_8_t kv0, value0;
snat_session_t * s0;
u32 new_addr0, old_addr0;
u16 old_id0, new_id0;
ip_csum_t sum0;
snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request))
{
b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
return SNAT_IN2OUT_NEXT_DROP;
}
echo0 = (icmp_echo_header_t *)(icmp0+1);
key0.addr = ip0->src_address;
key0.port = echo0->identifier;
key0.protocol = SNAT_PROTOCOL_ICMP;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index0,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index0;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
rt->cached_ip4_address))
return next0;
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
return next0;
}
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
old_addr0 = ip0->src_address.as_u32;
ip0->src_address = s0->out2in.addr;
new_addr0 = ip0->src_address.as_u32;
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);
old_id0 = echo0->identifier;
new_id0 = s0->out2in.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);
/* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
/* Per-user LRU list maintenance for dynamic translations */
if (!snat_is_session_static (s0))
{
clib_dlist_remove (sm->list_pool, s0->per_user_index);
clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
s0->per_user_index);
}
return next0;
}
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)
{
u32 n_left_from, * from, * to_next;
snat_in2out_next_t next_index;
u32 pkts_processed = 0;
snat_main_t * sm = &snat_main;
snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
f64 now = vlib_time_now (vm);
u32 stats_node_index;
stats_node_index = is_slow_path ? snat_in2out_slowpath_node.index :
snat_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;
/* 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);
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 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
sw_if_index0);
next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
#if 0
/* Formally correct, but we send to slowpath, lookup or drop */
vnet_get_config_data (&cm->config_main,
&b0->current_config_index,
&next0,
0 /* sizeof config data */);
#endif
proto0 = ~0;
proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
? SNAT_PROTOCOL_UDP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
? SNAT_PROTOCOL_TCP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
? SNAT_PROTOCOL_ICMP : proto0;
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto0 == ~0))
goto trace00;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
node, next0, now);
goto trace00;
}
}
else
{
if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
}
key0.addr = ip0->src_address;
key0.port = udp0->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->in2out, &kv0, &value0) != 0))
{
if (is_slow_path)
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index0,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index0;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
rt->cached_ip4_address))
goto trace00;
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace00;
}
else
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
}
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
old_addr0 = ip0->src_address.as_u32;
ip0->src_address = s0->out2in.addr;
new_addr0 = ip0->src_address.as_u32;
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 == SNAT_PROTOCOL_TCP))
{
old_port0 = tcp0->ports.src;
tcp0->ports.src = s0->out2in.port;
new_port0 = tcp0->ports.src;
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 */);
tcp0->checksum = ip_csum_fold(sum0);
}
else
{
old_port0 = udp0->src_port;
udp0->src_port = s0->out2in.port;
udp0->checksum = 0;
}
/* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
/* Per-user LRU list maintenance for dynamic translation */
if (!snat_is_session_static (s0))
{
clib_dlist_remove (sm->list_pool, s0->per_user_index);
clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
s0->per_user_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->sessions;
}
pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
ip1 = vlib_buffer_get_current (b1);
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 0
vnet_get_config_data (&cm->config_main,
&b1->current_config_index,
&next1,
0 /* sizeof config data */);
#endif
proto1 = ~0;
proto1 = (ip1->protocol == IP_PROTOCOL_UDP)
? SNAT_PROTOCOL_UDP : proto1;
proto1 = (ip1->protocol == IP_PROTOCOL_TCP)
? SNAT_PROTOCOL_TCP : proto1;
proto1 = (ip1->protocol == IP_PROTOCOL_ICMP)
? SNAT_PROTOCOL_ICMP : proto1;
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto1 == ~0))
goto trace01;
if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
{
next1 = icmp_in2out_slow_path
(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1,
now);
goto trace01;
}
}
else
{
if (PREDICT_FALSE (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP))
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
}
key1.addr = ip1->src_address;
key1.port = udp1->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->in2out, &kv1, &value1) != 0))
{
if (is_slow_path)
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index1))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index1,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index1;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip1->dst_address.as_u32 ==
rt->cached_ip4_address))
goto trace01;
next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
&s1, node, next1);
if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
goto trace01;
}
else
{
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
}
else
s1 = pool_elt_at_index (sm->sessions, value1.value);
old_addr1 = ip1->src_address.as_u32;
ip1->src_address = s1->out2in.addr;
new_addr1 = ip1->src_address.as_u32;
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 == SNAT_PROTOCOL_TCP))
{
old_port1 = tcp1->ports.src;
tcp1->ports.src = s1->out2in.port;
new_port1 = tcp1->ports.src;
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 */);
tcp1->checksum = ip_csum_fold(sum1);
}
else
{
old_port1 = udp1->src_port;
udp1->src_port = s1->out2in.port;
udp1->checksum = 0;
}
/* Accounting */
s1->last_heard = now;
s1->total_pkts++;
s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
/* Per-user LRU list maintenance for dynamic translation */
if (!snat_is_session_static (s1))
{
clib_dlist_remove (sm->list_pool, s1->per_user_index);
clib_dlist_addtail (sm->list_pool, s1->per_user_list_head_index,
s1->per_user_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->sessions;
}
pkts_processed += next1 != SNAT_IN2OUT_NEXT_DROP;
/* 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;
/* 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 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
sw_if_index0);
#if 0
vnet_get_config_data (&cm->config_main,
&b0->current_config_index,
&next0,
0 /* sizeof config data */);
#endif
proto0 = ~0;
proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
? SNAT_PROTOCOL_UDP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
? SNAT_PROTOCOL_TCP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
? SNAT_PROTOCOL_ICMP : proto0;
/* Next configured feature, probably ip4-lookup */
if (is_slow_path)
{
if (PREDICT_FALSE (proto0 == ~0))
goto trace0;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = icmp_in2out_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0,
now);
goto trace0;
}
}
else
{
if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
}
key0.addr = ip0->src_address;
key0.port = udp0->src_port;
key0.protocol = proto0;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
{
if (is_slow_path)
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index0,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index0;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
rt->cached_ip4_address))
goto trace0;
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
goto trace0;
}
else
{
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
}
else
s0 = pool_elt_at_index (sm->sessions, value0.value);
old_addr0 = ip0->src_address.as_u32;
ip0->src_address = s0->out2in.addr;
new_addr0 = ip0->src_address.as_u32;
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 == SNAT_PROTOCOL_TCP))
{
old_port0 = tcp0->ports.src;
tcp0->ports.src = s0->out2in.port;
new_port0 = tcp0->ports.src;
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 */);
tcp0->checksum = ip_csum_fold(sum0);
}
else
{
old_port0 = udp0->src_port;
udp0->src_port = s0->out2in.port;
udp0->checksum = 0;
}
/* Accounting */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
/* Per-user LRU list maintenance for dynamic translation */
if (!snat_is_session_static (s0))
{
clib_dlist_remove (sm->list_pool, s0->per_user_index);
clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
s0->per_user_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->sessions;
}
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;
}
static uword
snat_in2out_fast_path_fn (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 */);
}
VLIB_REGISTER_NODE (snat_in2out_node) = {
.function = snat_in2out_fast_path_fn,
.name = "snat-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] = "snat-in2out-slowpath",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_node, snat_in2out_fast_path_fn);
static uword
snat_in2out_slow_path_fn (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 */);
}
VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
.function = snat_in2out_slow_path_fn,
.name = "snat-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] = "snat-in2out-slowpath",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node, snat_in2out_slow_path_fn);
static inline u32 icmp_in2out_static_map (snat_main_t *sm,
vlib_buffer_t * b0,
ip4_header_t * ip0,
icmp46_header_t * icmp0,
u32 sw_if_index0,
vlib_node_runtime_t * node,
u32 next0,
u32 rx_fib_index0)
{
snat_session_key_t key0, sm0;
icmp_echo_header_t *echo0;
u32 new_addr0, old_addr0;
u16 old_id0, new_id0;
ip_csum_t sum0;
snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
echo0 = (icmp_echo_header_t *)(icmp0+1);
key0.addr = ip0->src_address;
key0.port = echo0->identifier;
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match(sm, key0, &sm0, 0))
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index0,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index0;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
rt->cached_ip4_address))
return next0;
b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
return SNAT_IN2OUT_NEXT_DROP;
}
new_addr0 = sm0.addr.as_u32;
new_id0 = 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_id0 != echo0->identifier))
{
old_id0 = echo0->identifier;
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);
}
return next0;
}
static uword
snat_in2out_fast_static_map_fn (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;
snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
u32 stats_node_index;
stats_node_index = snat_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);
proto0 = ~0;
proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
? SNAT_PROTOCOL_UDP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
? SNAT_PROTOCOL_TCP : proto0;
proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
? SNAT_PROTOCOL_ICMP : proto0;
if (PREDICT_FALSE (proto0 == ~0))
goto trace0;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
ip4_address_t * first_int_addr;
if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
{
first_int_addr =
ip4_interface_first_address (sm->ip4_main, sw_if_index0,
0 /* just want the address */);
rt->cached_sw_if_index = sw_if_index0;
rt->cached_ip4_address = first_int_addr->as_u32;
}
/* Don't NAT packet aimed at the intfc address */
if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
rt->cached_ip4_address))
goto trace0;
next0 = icmp_in2out_static_map
(sm, b0, ip0, icmp0, sw_if_index0, node, next0, rx_fib_index0);
goto trace0;
}
key0.addr = ip0->src_address;
key0.port = udp0->src_port;
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match(sm, key0, &sm0, 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))
{
if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
{
old_port0 = tcp0->ports.src;
tcp0->ports.src = new_port0;
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 */);
tcp0->checksum = ip_csum_fold(sum0);
}
else
{
old_port0 = udp0->src_port;
udp0->src_port = new_port0;
udp0->checksum = 0;
}
}
else
{
if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
{
sum0 = tcp0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_address /* changed member */);
tcp0->checksum = ip_csum_fold(sum0);
}
}
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;
}
VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
.function = snat_in2out_fast_static_map_fn,
.name = "snat-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] = "snat-in2out-slowpath",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_fast_node, snat_in2out_fast_static_map_fn);
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