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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/nat44-ed/nat44_ed_out2in.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/nat44-ed/nat44_ed_out2in.c')
-rw-r--r--src/plugins/nat/nat44-ed/nat44_ed_out2in.c1443
1 files changed, 1443 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ed/nat44_ed_out2in.c b/src/plugins/nat/nat44-ed/nat44_ed_out2in.c
new file mode 100644
index 00000000000..4d354d3e8ec
--- /dev/null
+++ b/src/plugins/nat/nat44-ed/nat44_ed_out2in.c
@@ -0,0 +1,1443 @@
+/*
+ * 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/lib/nat_syslog.h>
+#include <nat/lib/ipfix_logging.h>
+
+#include <nat/nat44-ed/nat44_ed.h>
+#include <nat/nat44-ed/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)
+{
+ snat_main_t *sm = &snat_main;
+ 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 (sm, "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)
+{
+ snat_main_t *sm = &snat_main;
+ snat_address_t *a, *ga = 0;
+ u32 portnum;
+ int i;
+
+ 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 (sm, "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 (sm, "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 (sm, "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_SESSIONS_EXCEEDED];
+ nat_elog_warn (sm, "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 (sm, "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 (sm, "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 (sm, "in2out flow hash add failed");
+ if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0))
+ {
+ nat_elog_warn (sm, "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 (0, 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 (sm, "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 (sm, "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 (sm, "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_SESSIONS_EXCEEDED];
+ nat_elog_warn (sm, "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 (sm, "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 (sm, "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.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.udp,
+ thread_index, sw_if_index0, 1);
+ break;
+ case NAT_PROTOCOL_ICMP:
+ vlib_increment_simple_counter (&sm->counters.fastpath.out2in.icmp,
+ thread_index, sw_if_index0, 1);
+ break;
+ case NAT_PROTOCOL_OTHER:
+ vlib_increment_simple_counter (&sm->counters.fastpath.out2in.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.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.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.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.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.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.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:
+ */