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vpp/src/plugins/snat/out2in.c
Matus Fabian 09d96f4a61 SNAT: Port allocation per protocol 
Ports are allocated per protocol (UDP, TCP, ICMP)
1:1 NAT with port is configured for specific protocol

Change-Id: I37ae5eed3715b223d0620d4fdaed7a482bb7a834
Signed-off-by: Matus Fabian <matfabia@cisco.com>
2017-02-03 01:09:45 -08:00

1301 lines
43 KiB
C
Raw Blame History

/*
* 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/handoff.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/udp.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/fib/ip4_fib.h>
#include <snat/snat.h>
#include <snat/snat_ipfix_logging.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;
} snat_out2in_trace_t;
typedef struct {
u32 next_worker_index;
u8 do_handoff;
} snat_out2in_worker_handoff_trace_t;
/* packet trace format function */
static u8 * format_snat_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 *);
snat_out2in_trace_t * t = va_arg (*args, snat_out2in_trace_t *);
s = format (s, "SNAT_OUT2IN: sw_if_index %d, next index %d, session index %d",
t->sw_if_index, t->next_index, t->session_index);
return s;
}
static u8 * format_snat_out2in_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_out2in_trace_t * t = va_arg (*args, snat_out2in_trace_t *);
s = format (s, "SNAT_OUT2IN_FAST: sw_if_index %d, next index %d",
t->sw_if_index, t->next_index);
return s;
}
static u8 * format_snat_out2in_worker_handoff_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_out2in_worker_handoff_trace_t * t =
va_arg (*args, snat_out2in_worker_handoff_trace_t *);
char * m;
m = t->do_handoff ? "next worker" : "same worker";
s = format (s, "SNAT_OUT2IN_WORKER_HANDOFF: %s %d", m, t->next_worker_index);
return s;
}
vlib_node_registration_t snat_out2in_node;
vlib_node_registration_t snat_out2in_fast_node;
vlib_node_registration_t snat_out2in_worker_handoff_node;
#define foreach_snat_out2in_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
_(OUT2IN_PACKETS, "Good out2in packets processed") \
_(BAD_ICMP_TYPE, "icmp type not echo-reply") \
_(NO_TRANSLATION, "No translation")
typedef enum {
#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
foreach_snat_out2in_error
#undef _
SNAT_OUT2IN_N_ERROR,
} snat_out2in_error_t;
static char * snat_out2in_error_strings[] = {
#define _(sym,string) string,
foreach_snat_out2in_error
#undef _
};
typedef enum {
SNAT_OUT2IN_NEXT_DROP,
SNAT_OUT2IN_NEXT_LOOKUP,
SNAT_OUT2IN_N_NEXT,
} snat_out2in_next_t;
/**
* @brief Create session for static mapping.
*
* Create NAT session initiated by host from external network with static
* mapping.
*
* @param sm SNAT main.
* @param b0 Vlib buffer.
* @param in2out In2out SNAT session key.
* @param out2in Out2in SNAT session key.
* @param node Vlib node.
*
* @returns SNAT session if successfully created otherwise 0.
*/
static inline snat_session_t *
create_session_for_static_mapping (snat_main_t *sm,
vlib_buffer_t *b0,
snat_session_key_t in2out,
snat_session_key_t out2in,
vlib_node_runtime_t * node,
u32 cpu_index)
{
snat_user_t *u;
snat_user_key_t user_key;
snat_session_t *s;
clib_bihash_kv_8_8_t kv0, value0;
dlist_elt_t * per_user_translation_list_elt;
dlist_elt_t * per_user_list_head_elt;
user_key.addr = in2out.addr;
user_key.fib_index = in2out.fib_index;
kv0.key = user_key.as_u64;
/* Ever heard of the "user" = inside ip4 address before? */
if (clib_bihash_search_8_8 (&sm->user_hash, &kv0, &value0))
{
/* no, make a new one */
pool_get (sm->per_thread_data[cpu_index].users, u);
memset (u, 0, sizeof (*u));
u->addr = in2out.addr;
pool_get (sm->per_thread_data[cpu_index].list_pool,
per_user_list_head_elt);
u->sessions_per_user_list_head_index = per_user_list_head_elt -
sm->per_thread_data[cpu_index].list_pool;
clib_dlist_init (sm->per_thread_data[cpu_index].list_pool,
u->sessions_per_user_list_head_index);
kv0.value = u - sm->per_thread_data[cpu_index].users;
/* add user */
clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */);
/* add non-traslated packets worker lookup */
kv0.value = cpu_index;
clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv0, 1);
}
else
{
u = pool_elt_at_index (sm->per_thread_data[cpu_index].users,
value0.value);
}
pool_get (sm->per_thread_data[cpu_index].sessions, s);
memset (s, 0, sizeof (*s));
s->outside_address_index = ~0;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
u->nstaticsessions++;
/* Create list elts */
pool_get (sm->per_thread_data[cpu_index].list_pool,
per_user_translation_list_elt);
clib_dlist_init (sm->per_thread_data[cpu_index].list_pool,
per_user_translation_list_elt -
sm->per_thread_data[cpu_index].list_pool);
per_user_translation_list_elt->value =
s - sm->per_thread_data[cpu_index].sessions;
s->per_user_index =
per_user_translation_list_elt - sm->per_thread_data[cpu_index].list_pool;
s->per_user_list_head_index = u->sessions_per_user_list_head_index;
clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool,
s->per_user_list_head_index,
per_user_translation_list_elt -
sm->per_thread_data[cpu_index].list_pool);
s->in2out = in2out;
s->out2in = out2in;
s->in2out.protocol = out2in.protocol;
/* Add to translation hashes */
kv0.key = s->in2out.as_u64;
kv0.value = s - sm->per_thread_data[cpu_index].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->per_thread_data[cpu_index].sessions;
if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */))
clib_warning ("out2in key add failed");
/* log NAT event */
snat_ipfix_logging_nat44_ses_create(s->in2out.addr.as_u32,
s->out2in.addr.as_u32,
s->in2out.protocol,
s->in2out.port,
s->out2in.port,
s->in2out.fib_index);
return s;
}
static inline u32 icmp_out2in_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 cpu_index)
{
snat_session_key_t key0, sm0;
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;
echo0 = (icmp_echo_header_t *)(icmp0+1);
key0.addr = ip0->dst_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->out2in, &kv0, &value0))
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
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;
if (first_int_addr)
rt->cached_ip4_address = first_int_addr->as_u32;
else
rt->cached_ip4_address = 0;
}
/* 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_OUT2IN_ERROR_NO_TRANSLATION];
return SNAT_OUT2IN_NEXT_DROP;
}
/* Create session initiated by host from external network */
s0 = create_session_for_static_mapping(sm, b0, sm0, key0,
node, cpu_index);
if (!s0)
return SNAT_OUT2IN_NEXT_DROP;
}
else
s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions,
value0.value);
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
new_addr0 = ip0->dst_address.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 /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
old_id0 = echo0->identifier;
new_id0 = s0->in2out.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 translation */
if (!snat_is_session_static (s0))
{
clib_dlist_remove (sm->per_thread_data[cpu_index].list_pool,
s0->per_user_index);
clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool,
s0->per_user_list_head_index,
s0->per_user_index);
}
return next0;
}
static uword
snat_out2in_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, * from, * to_next;
snat_out2in_next_t next_index;
u32 pkts_processed = 0;
snat_main_t * sm = &snat_main;
f64 now = vlib_time_now (vm);
u32 cpu_index = os_get_cpu_number ();
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 = SNAT_OUT2IN_NEXT_LOOKUP;
u32 next1 = SNAT_OUT2IN_NEXT_LOOKUP;
u32 sw_if_index0, sw_if_index1;
ip4_header_t * ip0, *ip1;
ip_csum_t sum0, sum1;
u32 new_addr0, old_addr0;
u16 new_port0, old_port0;
u32 new_addr1, old_addr1;
u16 new_port1, old_port1;
udp_header_t * udp0, * udp1;
tcp_header_t * tcp0, * tcp1;
icmp46_header_t * icmp0, * icmp1;
snat_session_key_t key0, key1, sm0, sm1;
u32 rx_fib_index0, rx_fib_index1;
u32 proto0, proto1;
snat_session_t * s0 = 0, * s1 = 0;
clib_bihash_kv_8_8_t kv0, kv1, value0, 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);
proto0 = ip_proto_to_snat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == ~0))
goto trace0;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = icmp_out2in_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, now, cpu_index);
goto trace0;
}
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
/*
* Send DHCP packets to the ipv4 stack, or we won't
* be able to use dhcp client on the outside interface
*/
if (proto0 != SNAT_PROTOCOL_UDP
|| (udp0->dst_port
!= clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
/* Create session initiated by host from external network */
s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node,
cpu_index);
if (!s0)
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
}
else
s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions,
value0.value);
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
new_addr0 = ip0->dst_address.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 /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
{
old_port0 = tcp0->ports.dst;
tcp0->ports.dst = s0->in2out.port;
new_port0 = tcp0->ports.dst;
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->dst_port;
udp0->dst_port = s0->in2out.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->per_thread_data[cpu_index].list_pool,
s0->per_user_index);
clib_dlist_addtail (sm->per_thread_data[cpu_index].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_out2in_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
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[cpu_index].sessions;
}
pkts_processed += next0 != SNAT_OUT2IN_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);
proto1 = ip_proto_to_snat_proto (ip1->protocol);
if (PREDICT_FALSE (proto1 == ~0))
goto trace1;
if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
{
next1 = icmp_out2in_slow_path
(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
next1, now, cpu_index);
goto trace1;
}
key1.addr = ip1->dst_address;
key1.port = udp1->dst_port;
key1.protocol = proto1;
key1.fib_index = rx_fib_index1;
kv1.key = key1.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv1, &value1))
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
if (snat_static_mapping_match(sm, key1, &sm1, 1))
{
b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
/*
* Send DHCP packets to the ipv4 stack, or we won't
* be able to use dhcp client on the outside interface
*/
if (proto1 != SNAT_PROTOCOL_UDP
|| (udp1->dst_port
!= clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
/* Create session initiated by host from external network */
s1 = create_session_for_static_mapping(sm, b1, sm1, key1, node,
cpu_index);
if (!s1)
{
b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
}
else
s1 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions,
value1.value);
old_addr1 = ip1->dst_address.as_u32;
ip1->dst_address = s1->in2out.addr;
new_addr1 = ip1->dst_address.as_u32;
vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index;
sum1 = ip1->checksum;
sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
ip4_header_t,
dst_address /* changed member */);
ip1->checksum = ip_csum_fold (sum1);
if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP))
{
old_port1 = tcp1->ports.dst;
tcp1->ports.dst = s1->in2out.port;
new_port1 = tcp1->ports.dst;
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->dst_port;
udp1->dst_port = s1->in2out.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->per_thread_data[cpu_index].list_pool,
s1->per_user_index);
clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool,
s1->per_user_list_head_index,
s1->per_user_index);
}
trace1:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b1->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_out2in_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[cpu_index].sessions;
}
pkts_processed += next1 != SNAT_OUT2IN_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 = SNAT_OUT2IN_NEXT_LOOKUP;
u32 sw_if_index0;
ip4_header_t * ip0;
ip_csum_t sum0;
u32 new_addr0, old_addr0;
u16 new_port0, old_port0;
udp_header_t * udp0;
tcp_header_t * tcp0;
icmp46_header_t * icmp0;
snat_session_key_t key0, sm0;
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);
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);
proto0 = ip_proto_to_snat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == ~0))
goto trace00;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = icmp_out2in_slow_path
(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, now, cpu_index);
goto trace00;
}
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
key0.fib_index = rx_fib_index0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
/*
* Send DHCP packets to the ipv4 stack, or we won't
* be able to use dhcp client on the outside interface
*/
if (proto0 != SNAT_PROTOCOL_UDP
|| (udp0->dst_port
!= clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
/* Create session initiated by host from external network */
s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node,
cpu_index);
if (!s0)
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
}
else
s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions,
value0.value);
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
new_addr0 = ip0->dst_address.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 /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
{
old_port0 = tcp0->ports.dst;
tcp0->ports.dst = s0->in2out.port;
new_port0 = tcp0->ports.dst;
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->dst_port;
udp0->dst_port = s0->in2out.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->per_thread_data[cpu_index].list_pool,
s0->per_user_index);
clib_dlist_addtail (sm->per_thread_data[cpu_index].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_out2in_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
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[cpu_index].sessions;
}
pkts_processed += next0 != SNAT_OUT2IN_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, snat_out2in_node.index,
SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
pkts_processed);
return frame->n_vectors;
}
VLIB_REGISTER_NODE (snat_out2in_node) = {
.function = snat_out2in_node_fn,
.name = "snat-out2in",
.vector_size = sizeof (u32),
.format_trace = format_snat_out2in_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_out2in_error_strings),
.error_strings = snat_out2in_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_OUT2IN_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);
static uword
snat_out2in_worker_handoff_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
snat_main_t *sm = &snat_main;
vlib_thread_main_t *tm = vlib_get_thread_main ();
u32 n_left_from, *from, *to_next = 0;
static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index;
static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index
= 0;
vlib_frame_queue_elt_t *hf = 0;
vlib_frame_t *f = 0;
int i;
u32 n_left_to_next_worker = 0, *to_next_worker = 0;
u32 next_worker_index = 0;
u32 current_worker_index = ~0;
u32 cpu_index = os_get_cpu_number ();
ASSERT (vec_len (sm->workers));
if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0))
{
vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
vec_validate_init_empty (congested_handoff_queue_by_worker_index,
sm->first_worker_index + sm->num_workers - 1,
(vlib_frame_queue_t *) (~0));
}
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
while (n_left_from > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 sw_if_index0;
u32 rx_fib_index0;
ip4_header_t * ip0;
udp_header_t * udp0;
snat_worker_key_t key0;
clib_bihash_kv_8_8_t kv0, value0;
u8 do_handoff;
bi0 = from[0];
from += 1;
n_left_from -= 1;
b0 = vlib_get_buffer (vm, bi0);
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);
ip0 = vlib_buffer_get_current (b0);
udp0 = ip4_next_header (ip0);
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.fib_index = rx_fib_index0;
if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_ICMP))
{
icmp46_header_t * icmp0 = (icmp46_header_t *) udp0;
icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1);
key0.port = echo0->identifier;
}
kv0.key = key0.as_u64;
/* Ever heard of of the "user" before? */
if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
{
key0.port = 0;
kv0.key = key0.as_u64;
if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
{
/* No, assign next available worker (RR) */
next_worker_index = sm->first_worker_index;
if (vec_len (sm->workers))
{
next_worker_index +=
sm->workers[sm->next_worker++ % _vec_len (sm->workers)];
}
}
else
{
/* Static mapping without port */
next_worker_index = value0.value;
}
/* Add to translated packets worker lookup */
kv0.value = next_worker_index;
clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv0, 1);
}
else
next_worker_index = value0.value;
if (PREDICT_FALSE (next_worker_index != cpu_index))
{
do_handoff = 1;
if (next_worker_index != current_worker_index)
{
if (hf)
hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
hf = vlib_get_worker_handoff_queue_elt (sm->fq_out2in_index,
next_worker_index,
handoff_queue_elt_by_worker_index);
n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
to_next_worker = &hf->buffer_index[hf->n_vectors];
current_worker_index = next_worker_index;
}
/* enqueue to correct worker thread */
to_next_worker[0] = bi0;
to_next_worker++;
n_left_to_next_worker--;
if (n_left_to_next_worker == 0)
{
hf->n_vectors = VLIB_FRAME_SIZE;
vlib_put_frame_queue_elt (hf);
current_worker_index = ~0;
handoff_queue_elt_by_worker_index[next_worker_index] = 0;
hf = 0;
}
}
else
{
do_handoff = 0;
/* if this is 1st frame */
if (!f)
{
f = vlib_get_frame_to_node (vm, snat_out2in_node.index);
to_next = vlib_frame_vector_args (f);
}
to_next[0] = bi0;
to_next += 1;
f->n_vectors++;
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_out2in_worker_handoff_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->next_worker_index = next_worker_index;
t->do_handoff = do_handoff;
}
}
if (f)
vlib_put_frame_to_node (vm, snat_out2in_node.index, f);
if (hf)
hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
/* Ship frames to the worker nodes */
for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
{
if (handoff_queue_elt_by_worker_index[i])
{
hf = handoff_queue_elt_by_worker_index[i];
/*
* It works better to let the handoff node
* rate-adapt, always ship the handoff queue element.
*/
if (1 || hf->n_vectors == hf->last_n_vectors)
{
vlib_put_frame_queue_elt (hf);
handoff_queue_elt_by_worker_index[i] = 0;
}
else
hf->last_n_vectors = hf->n_vectors;
}
congested_handoff_queue_by_worker_index[i] =
(vlib_frame_queue_t *) (~0);
}
hf = 0;
current_worker_index = ~0;
return frame->n_vectors;
}
VLIB_REGISTER_NODE (snat_out2in_worker_handoff_node) = {
.function = snat_out2in_worker_handoff_fn,
.name = "snat-out2in-worker-handoff",
.vector_size = sizeof (u32),
.format_trace = format_snat_out2in_worker_handoff_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_worker_handoff_node, snat_out2in_worker_handoff_fn);
static inline u32 icmp_out2in_fast (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->dst_address;
key0.port = echo0->identifier;
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
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;
if (first_int_addr)
rt->cached_ip4_address = first_int_addr->as_u32;
else
rt->cached_ip4_address = 0;
}
/* 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_OUT2IN_ERROR_NO_TRANSLATION];
return SNAT_OUT2IN_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->dst_address.as_u32;
ip0->dst_address.as_u32 = new_addr0;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_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_out2in_fast_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, * from, * to_next;
snat_out2in_next_t next_index;
u32 pkts_processed = 0;
snat_main_t * sm = &snat_main;
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 = SNAT_OUT2IN_NEXT_DROP;
u32 sw_if_index0;
ip4_header_t * ip0;
ip_csum_t sum0;
u32 new_addr0, old_addr0;
u16 new_port0, old_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);
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);
vnet_feature_next (sw_if_index0, &next0, b0);
proto0 = ip_proto_to_snat_proto (ip0->protocol);
if (PREDICT_FALSE (proto0 == ~0))
goto trace00;
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
next0 = icmp_out2in_fast
(sm, b0, ip0, icmp0, sw_if_index0, node, next0, rx_fib_index0);
goto trace00;
}
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.fib_index = rx_fib_index0;
if (snat_static_mapping_match(sm, key0, &sm0, 1))
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
goto trace00;
}
new_addr0 = sm0.addr.as_u32;
new_port0 = sm0.port;
vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address.as_u32 = new_addr0;
sum0 = ip0->checksum;
sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
ip4_header_t,
dst_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.dst;
tcp0->ports.dst = 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->dst_port;
udp0->dst_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);
}
}
trace00:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
snat_out2in_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_OUT2IN_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, snat_out2in_fast_node.index,
SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
pkts_processed);
return frame->n_vectors;
}
VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
.function = snat_out2in_fast_node_fn,
.name = "snat-out2in-fast",
.vector_size = sizeof (u32),
.format_trace = format_snat_out2in_fast_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(snat_out2in_error_strings),
.error_strings = snat_out2in_error_strings,
.runtime_data_bytes = sizeof (snat_runtime_t),
.n_next_nodes = SNAT_OUT2IN_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn);
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