summaryrefslogtreecommitdiffstats
path: root/src/plugins/nat/out2in_ed.c
diff options
context:
space:
mode:
authorFilip Varga <fivarga@cisco.com>2021-02-17 14:34:54 +0100
committerOle Tr�an <otroan@employees.org>2021-02-24 19:25:25 +0000
commit0eaf4e6784efb2d058fe2f031578251b6bcc0aa8 (patch)
treecc0c2b485bfee51068fa4970acc9f95ec595e8e5 /src/plugins/nat/out2in_ed.c
parent5db2f4a4312112ab57043ce88f10edc4acc141ec (diff)
nat: Final NAT44 EI/ED split patch
This patch achieves complete separation of endpoint-dependent and endpoint-independent IPv4 NAT features. Some common stuff is also moved to NAT library. Type: refactor Change-Id: I52468b7e2b5ac28958a2baf8e2ea01787322e801 Signed-off-by: Filip Varga <fivarga@cisco.com>
Diffstat (limited to 'src/plugins/nat/out2in_ed.c')
-rw-r--r--src/plugins/nat/out2in_ed.c1448
1 files changed, 0 insertions, 1448 deletions
diff --git a/src/plugins/nat/out2in_ed.c b/src/plugins/nat/out2in_ed.c
deleted file mode 100644
index d6beadc61bc..00000000000
--- a/src/plugins/nat/out2in_ed.c
+++ /dev/null
@@ -1,1448 +0,0 @@
-/*
- * Copyright (c) 2018 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/**
- * @file
- * @brief NAT44 endpoint-dependent outside to inside network translation
- */
-
-#include <vlib/vlib.h>
-#include <vnet/vnet.h>
-#include <vnet/ip/ip.h>
-#include <vnet/ethernet/ethernet.h>
-#include <vnet/fib/ip4_fib.h>
-#include <vnet/udp/udp_local.h>
-#include <vppinfra/error.h>
-#include <nat/nat.h>
-#include <nat/lib/ipfix_logging.h>
-#include <nat/nat_inlines.h>
-#include <nat/nat44/inlines.h>
-#include <nat/lib/nat_syslog.h>
-#include <nat/nat44/ed_inlines.h>
-
-static char *nat_out2in_ed_error_strings[] = {
-#define _(sym,string) string,
- foreach_nat_out2in_ed_error
-#undef _
-};
-
-typedef struct
-{
- u32 sw_if_index;
- u32 next_index;
- u32 session_index;
- nat_translation_error_e translation_error;
- nat_6t_flow_t i2of;
- nat_6t_flow_t o2if;
- clib_bihash_kv_16_8_t search_key;
- u8 is_slow_path;
- u8 translation_via_i2of;
- u8 lookup_skipped;
-} nat44_ed_out2in_trace_t;
-
-static u8 *
-format_nat44_ed_out2in_trace (u8 * s, va_list * args)
-{
- CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
- CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
- nat44_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *);
- char *tag;
-
- tag =
- t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" :
- "NAT44_OUT2IN_ED_FAST_PATH";
-
- s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
- t->sw_if_index, t->next_index, t->session_index);
- if (~0 != t->session_index)
- {
- s = format (s, ", translation result '%U' via %s",
- format_nat_ed_translation_error, t->translation_error,
- t->translation_via_i2of ? "i2of" : "o2if");
- s = format (s, "\n i2of %U", format_nat_6t_flow, &t->i2of);
- s = format (s, "\n o2if %U", format_nat_6t_flow, &t->o2if);
- }
- if (!t->is_slow_path)
- {
- if (t->lookup_skipped)
- {
- s = format (s, "\n lookup skipped - cached session index used");
- }
- else
- {
- s = format (s, "\n search key %U", format_ed_session_kvp,
- &t->search_key);
- }
- }
-
- return s;
-}
-
-static int
-next_src_nat (snat_main_t *sm, ip4_header_t *ip, u16 src_port, u16 dst_port,
- u32 thread_index, u32 rx_fib_index)
-{
- clib_bihash_kv_16_8_t kv, value;
-
- init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
- rx_fib_index, ip->protocol);
- if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
- return 1;
-
- return 0;
-}
-
-static void create_bypass_for_fwd (snat_main_t *sm, vlib_buffer_t *b,
- snat_session_t *s, ip4_header_t *ip,
- u32 rx_fib_index, u32 thread_index);
-
-static snat_session_t *create_session_for_static_mapping_ed (
- snat_main_t *sm, vlib_buffer_t *b, ip4_address_t i2o_addr, u16 i2o_port,
- u32 i2o_fib_index, ip4_address_t o2i_addr, u16 o2i_port, u32 o2i_fib_index,
- nat_protocol_t nat_proto, vlib_node_runtime_t *node, u32 rx_fib_index,
- u32 thread_index, twice_nat_type_t twice_nat, lb_nat_type_t lb_nat, f64 now,
- snat_static_mapping_t *mapping);
-
-static inline u32
-icmp_out2in_ed_slow_path (snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
- icmp46_header_t *icmp, u32 sw_if_index,
- u32 rx_fib_index, vlib_node_runtime_t *node,
- u32 next, f64 now, u32 thread_index,
- snat_session_t **s_p)
-{
- vlib_main_t *vm = vlib_get_main ();
-
- ip_csum_t sum;
- u16 checksum;
-
- snat_session_t *s = 0;
- u8 is_addr_only, identity_nat;
- ip4_address_t sm_addr;
- u16 sm_port;
- u32 sm_fib_index;
- snat_static_mapping_t *m;
- u8 lookup_protocol;
- ip4_address_t lookup_saddr, lookup_daddr;
- u16 lookup_sport, lookup_dport;
-
- sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
- rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
-
- if (nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr, &lookup_sport,
- &lookup_daddr, &lookup_dport,
- &lookup_protocol))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL];
- next = NAT_NEXT_DROP;
- goto out;
- }
-
- if (snat_static_mapping_match (
- sm, ip->dst_address, lookup_sport, rx_fib_index,
- ip_proto_to_nat_proto (ip->protocol), &sm_addr, &sm_port,
- &sm_fib_index, 1, &is_addr_only, 0, 0, 0, &identity_nat, &m))
- {
- // static mapping not matched
- if (!sm->forwarding_enabled)
- {
- /* Don't NAT packet aimed at the intfc address */
- if (!is_interface_addr (sm, node, sw_if_index,
- ip->dst_address.as_u32))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
- next = NAT_NEXT_DROP;
- }
- }
- else
- {
- if (next_src_nat (sm, ip, lookup_sport, lookup_dport, thread_index,
- rx_fib_index))
- {
- next = NAT_NEXT_IN2OUT_ED_FAST_PATH;
- }
- else
- {
- create_bypass_for_fwd (sm, b, s, ip, rx_fib_index, thread_index);
- }
- }
- goto out;
- }
-
- if (PREDICT_FALSE (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
- ICMP4_echo_reply &&
- (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
- ICMP4_echo_request ||
- !is_addr_only)))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
- next = NAT_NEXT_DROP;
- goto out;
- }
-
- if (PREDICT_FALSE (identity_nat))
- {
- goto out;
- }
-
- /* Create session initiated by host from external network */
- s = create_session_for_static_mapping_ed (
- sm, b, sm_addr, sm_port, sm_fib_index, ip->dst_address, lookup_sport,
- rx_fib_index, ip_proto_to_nat_proto (lookup_protocol), node, rx_fib_index,
- thread_index, 0, 0, vlib_time_now (vm), m);
- if (!s)
- next = NAT_NEXT_DROP;
-
- if (PREDICT_TRUE (!ip4_is_fragment (ip)))
- {
- sum = ip_incremental_checksum_buffer (
- vm, b, (u8 *) icmp - (u8 *) vlib_buffer_get_current (b),
- ntohs (ip->length) - ip4_header_bytes (ip), 0);
- checksum = ~ip_csum_fold (sum);
- if (checksum != 0 && checksum != 0xffff)
- {
- next = NAT_NEXT_DROP;
- goto out;
- }
- }
-
- if (PREDICT_TRUE (next != NAT_NEXT_DROP && s))
- {
- /* Accounting */
- nat44_session_update_counters (
- s, now, vlib_buffer_length_in_chain (vm, b), thread_index);
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s, thread_index);
- }
-out:
- if (NAT_NEXT_DROP == next && s)
- {
- nat_ed_session_delete (sm, s, thread_index, 1);
- s = 0;
- }
- *s_p = s;
- return next;
-}
-
-// allocate exact address based on preference
-static_always_inline int
-nat_alloc_addr_and_port_exact (snat_address_t * a,
- u32 thread_index,
- nat_protocol_t proto,
- ip4_address_t * addr,
- u16 * port,
- u16 port_per_thread, u32 snat_thread_index)
-{
- u32 portnum;
-
- switch (proto)
- {
-#define _(N, j, n, s) \
- case NAT_PROTOCOL_##N: \
- if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
- { \
- while (1) \
- { \
- portnum = (port_per_thread * \
- snat_thread_index) + \
- snat_random_port(0, port_per_thread - 1) + 1024; \
- if (a->busy_##n##_port_refcounts[portnum]) \
- continue; \
- --a->busy_##n##_port_refcounts[portnum]; \
- a->busy_##n##_ports_per_thread[thread_index]++; \
- a->busy_##n##_ports++; \
- *addr = a->addr; \
- *port = clib_host_to_net_u16(portnum); \
- return 0; \
- } \
- } \
- break;
- foreach_nat_protocol
-#undef _
- default:
- nat_elog_info ("unknown protocol");
- return 1;
- }
-
- /* Totally out of translations to use... */
- nat_ipfix_logging_addresses_exhausted (thread_index, 0);
- return 1;
-}
-
-static_always_inline int
-nat44_ed_alloc_outside_addr_and_port (snat_address_t *addresses, u32 fib_index,
- u32 thread_index, nat_protocol_t proto,
- ip4_address_t *addr, u16 *port,
- u16 port_per_thread,
- u32 snat_thread_index)
-{
- int i;
- snat_address_t *a, *ga = 0;
- u32 portnum;
-
- for (i = 0; i < vec_len (addresses); i++)
- {
- a = addresses + i;
- switch (proto)
- {
-#define _(N, j, n, s) \
- case NAT_PROTOCOL_##N: \
- if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
- { \
- if (a->fib_index == fib_index) \
- { \
- while (1) \
- { \
- portnum = (port_per_thread * snat_thread_index) + \
- snat_random_port (0, port_per_thread - 1) + 1024; \
- if (a->busy_##n##_port_refcounts[portnum]) \
- continue; \
- --a->busy_##n##_port_refcounts[portnum]; \
- a->busy_##n##_ports_per_thread[thread_index]++; \
- a->busy_##n##_ports++; \
- *addr = a->addr; \
- *port = clib_host_to_net_u16 (portnum); \
- return 0; \
- } \
- } \
- else if (a->fib_index == ~0) \
- { \
- ga = a; \
- } \
- } \
- break;
- foreach_nat_protocol
-#undef _
- default : nat_elog_info ("unknown protocol");
- return 1;
- }
- }
-
- if (ga)
- {
- a = ga;
- switch (proto)
- {
-#define _(N, j, n, s) \
- case NAT_PROTOCOL_##N: \
- while (1) \
- { \
- portnum = (port_per_thread * snat_thread_index) + \
- snat_random_port (0, port_per_thread - 1) + 1024; \
- if (a->busy_##n##_port_refcounts[portnum]) \
- continue; \
- ++a->busy_##n##_port_refcounts[portnum]; \
- a->busy_##n##_ports_per_thread[thread_index]++; \
- a->busy_##n##_ports++; \
- *addr = a->addr; \
- *port = clib_host_to_net_u16 (portnum); \
- return 0; \
- }
- break;
- foreach_nat_protocol
-#undef _
- default : nat_elog_info ("unknown protocol");
- return 1;
- }
- }
-
- /* Totally out of translations to use... */
- nat_ipfix_logging_addresses_exhausted (thread_index, 0);
- return 1;
-}
-
-static snat_session_t *
-create_session_for_static_mapping_ed (
- snat_main_t *sm, vlib_buffer_t *b, ip4_address_t i2o_addr, u16 i2o_port,
- u32 i2o_fib_index, ip4_address_t o2i_addr, u16 o2i_port, u32 o2i_fib_index,
- nat_protocol_t nat_proto, vlib_node_runtime_t *node, u32 rx_fib_index,
- u32 thread_index, twice_nat_type_t twice_nat, lb_nat_type_t lb_nat, f64 now,
- snat_static_mapping_t *mapping)
-{
- snat_session_t *s;
- ip4_header_t *ip;
- udp_header_t *udp;
- snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
-
- if (PREDICT_FALSE
- (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
- nat_elog_notice ("maximum sessions exceeded");
- return 0;
- }
-
- s = nat_ed_session_alloc (sm, thread_index, now, nat_proto);
- if (!s)
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
- nat_elog_warn ("create NAT session failed");
- return 0;
- }
-
- ip = vlib_buffer_get_current (b);
- udp = ip4_next_header (ip);
-
- s->ext_host_addr.as_u32 = ip->src_address.as_u32;
- s->ext_host_port = nat_proto == NAT_PROTOCOL_ICMP ? 0 : udp->src_port;
- s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
- if (lb_nat)
- s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
- if (lb_nat == AFFINITY_LB_NAT)
- s->flags |= SNAT_SESSION_FLAG_AFFINITY;
- s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
- s->out2in.addr = o2i_addr;
- s->out2in.port = o2i_port;
- s->out2in.fib_index = o2i_fib_index;
- s->in2out.addr = i2o_addr;
- s->in2out.port = i2o_port;
- s->in2out.fib_index = i2o_fib_index;
- s->nat_proto = nat_proto;
-
- if (NAT_PROTOCOL_ICMP == nat_proto)
- {
- nat_6t_o2i_flow_init (sm, thread_index, s, s->ext_host_addr, o2i_port,
- o2i_addr, o2i_port, o2i_fib_index, ip->protocol);
- nat_6t_flow_icmp_id_rewrite_set (&s->o2i, i2o_port);
- }
- else
- {
- nat_6t_o2i_flow_init (sm, thread_index, s, s->ext_host_addr,
- s->ext_host_port, o2i_addr, o2i_port,
- o2i_fib_index, ip->protocol);
- nat_6t_flow_dport_rewrite_set (&s->o2i, i2o_port);
- }
- nat_6t_flow_daddr_rewrite_set (&s->o2i, i2o_addr.as_u32);
- nat_6t_flow_txfib_rewrite_set (&s->o2i, i2o_fib_index);
-
- if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 1))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_HASH_ADD_FAILED];
- nat_ed_session_delete (sm, s, thread_index, 1);
- nat_elog_warn ("out2in flow hash add failed");
- return 0;
- }
-
- if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF &&
- ip->src_address.as_u32 == i2o_addr.as_u32))
- {
- int rc = 0;
- snat_address_t *filter = 0;
-
- // if exact address is specified use this address
- if (is_exact_address (mapping))
- {
- snat_address_t *ap;
- vec_foreach (ap, sm->twice_nat_addresses)
- {
- if (mapping->pool_addr.as_u32 == ap->addr.as_u32)
- {
- filter = ap;
- break;
- }
- }
- }
-
- if (filter)
- {
- rc = nat_alloc_addr_and_port_exact (filter,
- thread_index,
- nat_proto,
- &s->ext_host_nat_addr,
- &s->ext_host_nat_port,
- sm->port_per_thread,
- tsm->snat_thread_index);
- s->flags |= SNAT_SESSION_FLAG_EXACT_ADDRESS;
- }
- else
- {
- rc = nat44_ed_alloc_outside_addr_and_port (
- sm->twice_nat_addresses, 0, thread_index, nat_proto,
- &s->ext_host_nat_addr, &s->ext_host_nat_port, sm->port_per_thread,
- tsm->snat_thread_index);
- }
-
- if (rc)
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS];
- if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0))
- {
- nat_elog_warn ("out2in flow hash del failed");
- }
- snat_free_outside_address_and_port (
- sm->twice_nat_addresses, thread_index, &s->ext_host_nat_addr,
- s->ext_host_nat_port, s->nat_proto);
- nat_ed_session_delete (sm, s, thread_index, 1);
- return 0;
- }
-
- s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
-
- nat_6t_flow_saddr_rewrite_set (&s->o2i, s->ext_host_nat_addr.as_u32);
- if (NAT_PROTOCOL_ICMP == nat_proto)
- {
- nat_6t_flow_icmp_id_rewrite_set (&s->o2i, s->ext_host_nat_port);
- }
- else
- {
- nat_6t_flow_sport_rewrite_set (&s->o2i, s->ext_host_nat_port);
- }
-
- nat_6t_l3_l4_csum_calc (&s->o2i);
-
- nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
- s->ext_host_nat_addr, s->ext_host_nat_port,
- i2o_fib_index, ip->protocol);
- nat_6t_flow_daddr_rewrite_set (&s->i2o, s->ext_host_addr.as_u32);
- if (NAT_PROTOCOL_ICMP == nat_proto)
- {
- nat_6t_flow_icmp_id_rewrite_set (&s->i2o, s->ext_host_port);
- }
- else
- {
- nat_6t_flow_dport_rewrite_set (&s->i2o, s->ext_host_port);
- }
- }
- else
- {
- if (NAT_PROTOCOL_ICMP == nat_proto)
- {
- nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
- s->ext_host_addr, i2o_port, i2o_fib_index,
- ip->protocol);
- }
- else
- {
- nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
- s->ext_host_addr, s->ext_host_port,
- i2o_fib_index, ip->protocol);
- }
- }
-
- nat_6t_flow_saddr_rewrite_set (&s->i2o, o2i_addr.as_u32);
- if (NAT_PROTOCOL_ICMP == nat_proto)
- {
- nat_6t_flow_icmp_id_rewrite_set (&s->i2o, o2i_port);
- }
- else
- {
- nat_6t_flow_sport_rewrite_set (&s->i2o, o2i_port);
- }
-
- if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
- {
- nat_elog_notice ("in2out flow hash add failed");
- if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0))
- {
- nat_elog_warn ("out2in flow hash del failed");
- }
- nat_ed_session_delete (sm, s, thread_index, 1);
- return 0;
- }
-
- nat_ipfix_logging_nat44_ses_create (thread_index,
- s->in2out.addr.as_u32,
- s->out2in.addr.as_u32,
- s->nat_proto,
- s->in2out.port,
- s->out2in.port, s->in2out.fib_index);
-
- nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
- &s->in2out.addr, s->in2out.port,
- &s->ext_host_nat_addr, s->ext_host_nat_port,
- &s->out2in.addr, s->out2in.port,
- &s->ext_host_addr, s->ext_host_port,
- s->nat_proto, is_twice_nat_session (s));
-
- per_vrf_sessions_register_session (s, thread_index);
-
- return s;
-}
-
-static void
-create_bypass_for_fwd (snat_main_t *sm, vlib_buffer_t *b, snat_session_t *s,
- ip4_header_t *ip, u32 rx_fib_index, u32 thread_index)
-{
- clib_bihash_kv_16_8_t kv, value;
- udp_header_t *udp;
- snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
- vlib_main_t *vm = vlib_get_main ();
- f64 now = vlib_time_now (vm);
- u16 lookup_sport, lookup_dport;
- u8 lookup_protocol;
- ip4_address_t lookup_saddr, lookup_daddr;
-
- if (ip->protocol == IP_PROTOCOL_ICMP)
- {
- if (nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr,
- &lookup_sport, &lookup_daddr,
- &lookup_dport, &lookup_protocol))
- return;
- }
- else
- {
- if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
- {
- udp = ip4_next_header (ip);
- lookup_sport = udp->dst_port;
- lookup_dport = udp->src_port;
- }
- else
- {
- lookup_sport = 0;
- lookup_dport = 0;
- }
- lookup_saddr.as_u32 = ip->dst_address.as_u32;
- lookup_daddr.as_u32 = ip->src_address.as_u32;
- lookup_protocol = ip->protocol;
- }
-
- init_ed_k (&kv, lookup_saddr, lookup_sport, lookup_daddr, lookup_dport,
- rx_fib_index, lookup_protocol);
-
- if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
- {
- ASSERT (thread_index == ed_value_get_thread_index (&value));
- s =
- pool_elt_at_index (tsm->sessions,
- ed_value_get_session_index (&value));
- }
- else if (ip->protocol == IP_PROTOCOL_ICMP &&
- icmp_type_is_error_message
- (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
- {
- return;
- }
- else
- {
- u32 proto;
-
- if (PREDICT_FALSE
- (nat44_ed_maximum_sessions_exceeded
- (sm, rx_fib_index, thread_index)))
- return;
-
- s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
- if (!s)
- {
- nat_elog_warn ("create NAT session failed");
- return;
- }
-
- proto = ip_proto_to_nat_proto (ip->protocol);
-
- s->ext_host_addr = ip->src_address;
- s->ext_host_port = lookup_dport;
- s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS;
- s->out2in.addr = ip->dst_address;
- s->out2in.port = lookup_sport;
- s->nat_proto = proto;
- if (proto == NAT_PROTOCOL_OTHER)
- {
- s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
- s->out2in.port = ip->protocol;
- }
- s->out2in.fib_index = rx_fib_index;
- s->in2out.addr = s->out2in.addr;
- s->in2out.port = s->out2in.port;
- s->in2out.fib_index = s->out2in.fib_index;
-
- nat_6t_i2o_flow_init (sm, thread_index, s, ip->dst_address, lookup_sport,
- ip->src_address, lookup_dport, rx_fib_index,
- ip->protocol);
- nat_6t_flow_txfib_rewrite_set (&s->i2o, rx_fib_index);
- if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
- {
- nat_elog_notice ("in2out flow add failed");
- nat_ed_session_delete (sm, s, thread_index, 1);
- return;
- }
-
- per_vrf_sessions_register_session (s, thread_index);
- }
-
- if (ip->protocol == IP_PROTOCOL_TCP)
- {
- tcp_header_t *tcp = ip4_next_header (ip);
- nat44_set_tcp_session_state_o2i (sm, now, s, tcp->flags,
- tcp->ack_number, tcp->seq_number,
- thread_index);
- }
-
- /* Accounting */
- nat44_session_update_counters (s, now, 0, thread_index);
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s, thread_index);
-}
-
-static snat_session_t *
-nat44_ed_out2in_slowpath_unknown_proto (snat_main_t *sm, vlib_buffer_t *b,
- ip4_header_t *ip, u32 rx_fib_index,
- u32 thread_index, f64 now,
- vlib_main_t *vm,
- vlib_node_runtime_t *node)
-{
- clib_bihash_kv_8_8_t kv, value;
- snat_static_mapping_t *m;
- snat_session_t *s;
-
- if (PREDICT_FALSE (
- nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
- nat_elog_notice ("maximum sessions exceeded");
- return 0;
- }
-
- init_nat_k (&kv, ip->dst_address, 0, 0, 0);
- if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
- return 0;
- }
-
- m = pool_elt_at_index (sm->static_mappings, value.value);
-
- /* Create a new session */
- s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
- if (!s)
- {
- b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
- nat_elog_warn ("create NAT session failed");
- return 0;
- }
-
- s->ext_host_addr.as_u32 = ip->src_address.as_u32;
- s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
- s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
- s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
- s->out2in.addr.as_u32 = ip->dst_address.as_u32;
- s->out2in.fib_index = rx_fib_index;
- s->in2out.addr.as_u32 = m->local_addr.as_u32;
- s->in2out.fib_index = m->fib_index;
- s->in2out.port = s->out2in.port = ip->protocol;
-
- nat_6t_o2i_flow_init (sm, thread_index, s, ip->dst_address, 0,
- ip->src_address, 0, m->fib_index, ip->protocol);
- nat_6t_flow_saddr_rewrite_set (&s->i2o, ip->dst_address.as_u32);
- if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
- {
- nat_elog_notice ("in2out key add failed");
- nat_ed_session_delete (sm, s, thread_index, 1);
- return NULL;
- }
-
- nat_6t_o2i_flow_init (sm, thread_index, s, ip->src_address, 0,
- ip->dst_address, 0, rx_fib_index, ip->protocol);
- nat_6t_flow_daddr_rewrite_set (&s->o2i, m->local_addr.as_u32);
- nat_6t_flow_txfib_rewrite_set (&s->o2i, m->fib_index);
- if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 1))
- {
- nat_elog_notice ("out2in flow hash add failed");
- nat_ed_session_delete (sm, s, thread_index, 1);
- return NULL;
- }
-
- per_vrf_sessions_register_session (s, thread_index);
-
- /* Accounting */
- nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
- thread_index);
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s, thread_index);
-
- return s;
-}
-
-static inline uword
-nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame,
- int is_multi_worker)
-{
- u32 n_left_from, *from;
- snat_main_t *sm = &snat_main;
- f64 now = vlib_time_now (vm);
- u32 thread_index = vm->thread_index;
- snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
-
- from = vlib_frame_vector_args (frame);
- n_left_from = frame->n_vectors;
-
- vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
- u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
- vlib_get_buffers (vm, from, b, n_left_from);
-
- while (n_left_from > 0)
- {
- vlib_buffer_t *b0;
- u32 sw_if_index0, rx_fib_index0;
- nat_protocol_t proto0;
- ip4_header_t *ip0;
- snat_session_t *s0 = 0;
- clib_bihash_kv_16_8_t kv0, value0;
- nat_translation_error_e translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
- nat_6t_flow_t *f = 0;
- ip4_address_t lookup_saddr, lookup_daddr;
- u16 lookup_sport, lookup_dport;
- u8 lookup_protocol;
- int lookup_skipped = 0;
-
- b0 = *b;
- b++;
-
- lookup_sport = vnet_buffer (b0)->ip.reass.l4_src_port;
- lookup_dport = vnet_buffer (b0)->ip.reass.l4_dst_port;
-
- /* Prefetch next iteration. */
- if (PREDICT_TRUE (n_left_from >= 2))
- {
- vlib_buffer_t *p2;
-
- p2 = *b;
-
- vlib_prefetch_buffer_header (p2, LOAD);
-
- CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
- }
-
- next[0] = vnet_buffer2 (b0)->nat.arc_next;
-
- vnet_buffer (b0)->snat.flags = 0;
- ip0 = vlib_buffer_get_current (b0);
-
- sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- rx_fib_index0 =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0);
-
- if (PREDICT_FALSE (ip0->ttl == 1))
- {
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
- ICMP4_time_exceeded_ttl_exceeded_in_transit,
- 0);
- next[0] = NAT_NEXT_ICMP_ERROR;
- goto trace0;
- }
-
- proto0 = ip_proto_to_nat_proto (ip0->protocol);
-
- if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
- {
- if (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[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
- int err = nat_get_icmp_session_lookup_values (
- b0, ip0, &lookup_saddr, &lookup_sport, &lookup_daddr,
- &lookup_dport, &lookup_protocol);
- if (err != 0)
- {
- b0->error = node->errors[err];
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
- }
- else
- {
- lookup_saddr.as_u32 = ip0->src_address.as_u32;
- lookup_daddr.as_u32 = ip0->dst_address.as_u32;
- lookup_protocol = ip0->protocol;
- }
-
- /* there might be a stashed index in vnet_buffer2 from handoff or
- * classify node, see if it can be used */
- if (!pool_is_free_index (tsm->sessions,
- vnet_buffer2 (b0)->nat.cached_session_index))
- {
- s0 = pool_elt_at_index (tsm->sessions,
- vnet_buffer2 (b0)->nat.cached_session_index);
- if (PREDICT_TRUE (
- nat_6t_flow_match (&s0->o2i, b0, lookup_saddr, lookup_sport,
- lookup_daddr, lookup_dport, lookup_protocol,
- rx_fib_index0) ||
- (s0->flags & SNAT_SESSION_FLAG_TWICE_NAT &&
- nat_6t_flow_match (&s0->i2o, b0, lookup_saddr, lookup_sport,
- lookup_daddr, lookup_dport,
- lookup_protocol, rx_fib_index0))))
- {
- /* yes, this is the droid we're looking for */
- lookup_skipped = 1;
- goto skip_lookup;
- }
- s0 = NULL;
- }
-
- init_ed_k (&kv0, lookup_saddr, lookup_sport, lookup_daddr, lookup_dport,
- rx_fib_index0, lookup_protocol);
-
- // lookup flow
- if (clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
- {
- // flow does not exist go slow path
- next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
- goto trace0;
- }
- ASSERT (thread_index == ed_value_get_thread_index (&value0));
- s0 =
- pool_elt_at_index (tsm->sessions,
- ed_value_get_session_index (&value0));
- skip_lookup:
-
- if (PREDICT_FALSE (per_vrf_sessions_is_expired (s0, thread_index)))
- {
- // session is closed, go slow path
- nat_free_session_data (sm, s0, thread_index, 0);
- nat_ed_session_delete (sm, s0, thread_index, 1);
- next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
- goto trace0;
- }
-
- if (s0->tcp_closed_timestamp)
- {
- if (now >= s0->tcp_closed_timestamp)
- {
- // session is closed, go slow path, freed in slow path
- next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
- }
- else
- {
- // session in transitory timeout, drop
- b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TCP_CLOSED];
- next[0] = NAT_NEXT_DROP;
- }
- goto trace0;
- }
-
- // drop if session expired
- u64 sess_timeout_time;
- sess_timeout_time =
- s0->last_heard + (f64) nat44_session_get_timeout (sm, s0);
- if (now >= sess_timeout_time)
- {
- // session is closed, go slow path
- nat_free_session_data (sm, s0, thread_index, 0);
- nat_ed_session_delete (sm, s0, thread_index, 1);
- next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
- goto trace0;
- }
-
- if (nat_6t_flow_match (&s0->o2i, b0, lookup_saddr, lookup_sport,
- lookup_daddr, lookup_dport, lookup_protocol,
- rx_fib_index0))
- {
- f = &s0->o2i;
- }
- else if (s0->flags & SNAT_SESSION_FLAG_TWICE_NAT &&
- nat_6t_flow_match (&s0->i2o, b0, lookup_saddr, lookup_sport,
- lookup_daddr, lookup_dport, lookup_protocol,
- rx_fib_index0))
- {
- f = &s0->i2o;
- }
- else
- {
- /*
- * Send DHCP packets to the ipv4 stack, or we won't
- * be able to use dhcp client on the outside interface
- */
- if (PREDICT_FALSE (
- proto0 == NAT_PROTOCOL_UDP &&
- (vnet_buffer (b0)->ip.reass.l4_dst_port ==
- clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client))))
- {
- goto trace0;
- }
-
- if (!sm->forwarding_enabled)
- {
- b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
- else
- {
- if (nat_6t_flow_match (&s0->i2o, b0, lookup_saddr, lookup_sport,
- lookup_daddr, lookup_dport,
- lookup_protocol, rx_fib_index0))
- {
- f = &s0->i2o;
- }
- else
- {
- // FIXME TODO bypass ???
- // create_bypass_for_fwd (sm, b0, s0, ip0, rx_fib_index0,
- // thread_index);
- translation_error = NAT_ED_TRNSL_ERR_FLOW_MISMATCH;
- nat_free_session_data (sm, s0, thread_index, 0);
- nat_ed_session_delete (sm, s0, thread_index, 1);
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
- }
- }
-
- if (NAT_ED_TRNSL_ERR_SUCCESS !=
- (translation_error = nat_6t_flow_buf_translate (
- sm, b0, ip0, f, proto0, 0 /* is_output_feature */)))
- {
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
-
- switch (proto0)
- {
- case NAT_PROTOCOL_TCP:
- vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.tcp,
- thread_index, sw_if_index0, 1);
- nat44_set_tcp_session_state_o2i (sm, now, s0,
- vnet_buffer (b0)->ip.
- reass.icmp_type_or_tcp_flags,
- vnet_buffer (b0)->ip.
- reass.tcp_ack_number,
- vnet_buffer (b0)->ip.
- reass.tcp_seq_number,
- thread_index);
- break;
- case NAT_PROTOCOL_UDP:
- vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.udp,
- thread_index, sw_if_index0, 1);
- break;
- case NAT_PROTOCOL_ICMP:
- vlib_increment_simple_counter (&sm->counters.fastpath.out2in_ed.icmp,
- thread_index, sw_if_index0, 1);
- break;
- case NAT_PROTOCOL_OTHER:
- vlib_increment_simple_counter (
- &sm->counters.fastpath.out2in_ed.other, thread_index, sw_if_index0,
- 1);
- break;
- }
-
- /* Accounting */
- nat44_session_update_counters (s0, now,
- vlib_buffer_length_in_chain (vm, b0),
- thread_index);
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s0, thread_index);
-
- trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- nat44_ed_out2in_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->sw_if_index = sw_if_index0;
- t->next_index = next[0];
- t->is_slow_path = 0;
- t->translation_error = translation_error;
- clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
- t->lookup_skipped = lookup_skipped;
-
- if (s0)
- {
- t->session_index = s0 - tsm->sessions;
- clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
- clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
- t->translation_via_i2of = (&s0->i2o == f);
- }
- else
- {
- t->session_index = ~0;
- }
- }
-
- if (next[0] == NAT_NEXT_DROP)
- {
- vlib_increment_simple_counter (&sm->counters.fastpath.
- out2in_ed.drops, thread_index,
- sw_if_index0, 1);
- }
-
- n_left_from--;
- next++;
- }
-
- vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
- frame->n_vectors);
- return frame->n_vectors;
-}
-
-static inline uword
-nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- u32 n_left_from, *from;
- snat_main_t *sm = &snat_main;
- f64 now = vlib_time_now (vm);
- u32 thread_index = vm->thread_index;
- snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
- snat_static_mapping_t *m;
-
- from = vlib_frame_vector_args (frame);
- n_left_from = frame->n_vectors;
-
- vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
- u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
- vlib_get_buffers (vm, from, b, n_left_from);
-
- while (n_left_from > 0)
- {
- vlib_buffer_t *b0;
- u32 sw_if_index0, rx_fib_index0;
- nat_protocol_t proto0;
- ip4_header_t *ip0;
- udp_header_t *udp0;
- icmp46_header_t *icmp0;
- snat_session_t *s0 = 0;
- clib_bihash_kv_16_8_t kv0, value0;
- lb_nat_type_t lb_nat0;
- twice_nat_type_t twice_nat0;
- u8 identity_nat0;
- ip4_address_t sm_addr;
- u16 sm_port;
- u32 sm_fib_index;
- nat_translation_error_e translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
-
- b0 = *b;
- next[0] = vnet_buffer2 (b0)->nat.arc_next;
-
- vnet_buffer (b0)->snat.flags = 0;
- ip0 = vlib_buffer_get_current (b0);
-
- sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- rx_fib_index0 =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0);
-
- if (PREDICT_FALSE (ip0->ttl == 1))
- {
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
- ICMP4_time_exceeded_ttl_exceeded_in_transit,
- 0);
- next[0] = NAT_NEXT_ICMP_ERROR;
- goto trace0;
- }
-
- udp0 = ip4_next_header (ip0);
- icmp0 = (icmp46_header_t *) udp0;
- proto0 = ip_proto_to_nat_proto (ip0->protocol);
-
- if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
- {
- s0 = nat44_ed_out2in_slowpath_unknown_proto (
- sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node);
- if (!sm->forwarding_enabled)
- {
- if (!s0)
- next[0] = NAT_NEXT_DROP;
- }
- if (NAT_NEXT_DROP != next[0] &&
- NAT_ED_TRNSL_ERR_SUCCESS !=
- (translation_error = nat_6t_flow_buf_translate (
- sm, b0, ip0, &s0->o2i, proto0, 0 /* is_output_feature */)))
- {
- goto trace0;
- }
-
- vlib_increment_simple_counter (&sm->counters.slowpath.
- out2in_ed.other, thread_index,
- sw_if_index0, 1);
- goto trace0;
- }
-
- if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
- {
- next[0] = icmp_out2in_ed_slow_path
- (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
- next[0], now, thread_index, &s0);
-
- if (NAT_NEXT_DROP != next[0] && s0 &&
- NAT_ED_TRNSL_ERR_SUCCESS !=
- (translation_error = nat_6t_flow_buf_translate (
- sm, b0, ip0, &s0->o2i, proto0, 0 /* is_output_feature */)))
- {
- goto trace0;
- }
-
- vlib_increment_simple_counter (&sm->counters.slowpath.
- out2in_ed.icmp, thread_index,
- sw_if_index0, 1);
- goto trace0;
- }
-
- init_ed_k (&kv0, ip0->src_address,
- vnet_buffer (b0)->ip.reass.l4_src_port, ip0->dst_address,
- vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
- ip0->protocol);
-
- s0 = NULL;
- if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
- {
- ASSERT (thread_index == ed_value_get_thread_index (&value0));
- s0 =
- pool_elt_at_index (tsm->sessions,
- ed_value_get_session_index (&value0));
-
- if (s0->tcp_closed_timestamp && now >= s0->tcp_closed_timestamp)
- {
- nat_free_session_data (sm, s0, thread_index, 0);
- nat_ed_session_delete (sm, s0, thread_index, 1);
- s0 = NULL;
- }
- }
-
- if (!s0)
- {
- /* Try to match static mapping by external address and port,
- destination address and port in packet */
-
- if (snat_static_mapping_match
- (sm, ip0->dst_address,
- vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
- proto0, &sm_addr, &sm_port, &sm_fib_index, 1, 0,
- &twice_nat0, &lb_nat0, &ip0->src_address, &identity_nat0, &m))
- {
- /*
- * Send DHCP packets to the ipv4 stack, or we won't
- * be able to use dhcp client on the outside interface
- */
- if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_UDP
- && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
- clib_host_to_net_u16
- (UDP_DST_PORT_dhcp_to_client))))
- {
- goto trace0;
- }
-
- if (!sm->forwarding_enabled)
- {
- b0->error =
- node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
- next[0] = NAT_NEXT_DROP;
- }
- else
- {
- if (next_src_nat
- (sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
- vnet_buffer (b0)->ip.reass.l4_dst_port,
- thread_index, rx_fib_index0))
- {
- next[0] = NAT_NEXT_IN2OUT_ED_FAST_PATH;
- }
- else
- {
- create_bypass_for_fwd (sm, b0, s0, ip0, rx_fib_index0,
- thread_index);
- }
- }
- goto trace0;
- }
-
- if (PREDICT_FALSE (identity_nat0))
- goto trace0;
-
- if ((proto0 == NAT_PROTOCOL_TCP)
- && !tcp_flags_is_init (vnet_buffer (b0)->ip.
- reass.icmp_type_or_tcp_flags))
- {
- b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
-
- /* Create session initiated by host from external network */
- s0 = create_session_for_static_mapping_ed (sm, b0,
- sm_addr, sm_port,
- sm_fib_index,
- ip0->dst_address,
- vnet_buffer (b0)->
- ip.reass.l4_dst_port,
- rx_fib_index0, proto0,
- node, rx_fib_index0,
- thread_index, twice_nat0,
- lb_nat0, now, m);
- if (!s0)
- {
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
- }
-
- if (NAT_ED_TRNSL_ERR_SUCCESS !=
- (translation_error = nat_6t_flow_buf_translate (
- sm, b0, ip0, &s0->o2i, proto0, 0 /* is_output_feature */)))
- {
- next[0] = NAT_NEXT_DROP;
- goto trace0;
- }
-
- if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
- {
- vlib_increment_simple_counter (&sm->counters.slowpath.out2in_ed.tcp,
- thread_index, sw_if_index0, 1);
- nat44_set_tcp_session_state_o2i (sm, now, s0,
- vnet_buffer (b0)->ip.
- reass.icmp_type_or_tcp_flags,
- vnet_buffer (b0)->ip.
- reass.tcp_ack_number,
- vnet_buffer (b0)->ip.
- reass.tcp_seq_number,
- thread_index);
- }
- else
- {
- vlib_increment_simple_counter (&sm->counters.slowpath.out2in_ed.udp,
- thread_index, sw_if_index0, 1);
- }
-
- /* Accounting */
- nat44_session_update_counters (s0, now,
- vlib_buffer_length_in_chain (vm, b0),
- thread_index);
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s0, thread_index);
-
- trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- nat44_ed_out2in_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->sw_if_index = sw_if_index0;
- t->next_index = next[0];
- t->is_slow_path = 1;
- t->translation_error = translation_error;
- clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
-
- if (s0)
- {
- t->session_index = s0 - tsm->sessions;
- clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
- clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
- }
- else
- {
- t->session_index = ~0;
- }
- }
-
- if (next[0] == NAT_NEXT_DROP)
- {
- vlib_increment_simple_counter (&sm->counters.slowpath.
- out2in_ed.drops, thread_index,
- sw_if_index0, 1);
- }
-
- n_left_from--;
- next++;
- b++;
- }
-
- vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
- frame->n_vectors);
-
- return frame->n_vectors;
-}
-
-VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- if (snat_main.num_workers > 1)
- {
- return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 1);
- }
- else
- {
- return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 0);
- }
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat44_ed_out2in_node) = {
- .name = "nat44-ed-out2in",
- .vector_size = sizeof (u32),
- .sibling_of = "nat-default",
- .format_trace = format_nat44_ed_out2in_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
- .error_strings = nat_out2in_ed_error_strings,
- .runtime_data_bytes = sizeof (snat_runtime_t),
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (nat44_ed_out2in_slowpath_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat44_ed_out2in_slow_path_node_fn_inline (vm, node, frame);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = {
- .name = "nat44-ed-out2in-slowpath",
- .vector_size = sizeof (u32),
- .sibling_of = "nat-default",
- .format_trace = format_nat44_ed_out2in_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
- .error_strings = nat_out2in_ed_error_strings,
- .runtime_data_bytes = sizeof (snat_runtime_t),
-};
-/* *INDENT-ON* */
-
-static u8 *
-format_nat_pre_trace (u8 * s, va_list * args)
-{
- CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
- CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
- nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
- return format (s, "out2in next_index %d arc_next_index %d", t->next_index,
- t->arc_next_index);
-}
-
-VLIB_NODE_FN (nat_pre_out2in_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat_pre_node_fn_inline (vm, node, frame,
- NAT_NEXT_OUT2IN_ED_FAST_PATH);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat_pre_out2in_node) = {
- .name = "nat-pre-out2in",
- .vector_size = sizeof (u32),
- .sibling_of = "nat-default",
- .format_trace = format_nat_pre_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = 0,
- };
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */