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-rw-r--r--src/plugins/nat/nat44-ed/nat44_ed_in2out.c1579
1 files changed, 1579 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ed/nat44_ed_in2out.c b/src/plugins/nat/nat44-ed/nat44_ed_in2out.c
new file mode 100644
index 00000000000..784dea0faf6
--- /dev/null
+++ b/src/plugins/nat/nat44-ed/nat44_ed_in2out.c
@@ -0,0 +1,1579 @@
+/*
+ * 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 inside to outside 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/nat_inlines.h>
+#include <nat/lib/ipfix_logging.h>
+
+#include <nat/nat44-ed/nat44_ed.h>
+#include <nat/nat44-ed/nat44_ed_inlines.h>
+
+/* number of attempts to get a port for ED overloading algorithm, if rolling
+ * a dice this many times doesn't produce a free port, it's treated
+ * as if there were no free ports available to conserve resources */
+#define ED_PORT_ALLOC_ATTEMPTS (10)
+
+static char *nat_in2out_ed_error_strings[] = {
+#define _(sym,string) string,
+ foreach_nat_in2out_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;
+} nat_in2out_ed_trace_t;
+
+static u8 *
+format_nat_in2out_ed_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_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
+ char *tag;
+
+ tag =
+ t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
+ "NAT44_IN2OUT_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;
+}
+
+/**
+ * @brief Check if packet should be translated
+ *
+ * Packets aimed at outside interface and external address with active session
+ * should be translated.
+ *
+ * @param sm NAT main
+ * @param rt NAT runtime data
+ * @param sw_if_index0 index of the inside interface
+ * @param ip0 IPv4 header
+ * @param proto0 NAT protocol
+ * @param rx_fib_index0 RX FIB index
+ *
+ * @returns 0 if packet should be translated otherwise 1
+ */
+static inline int
+snat_not_translate_fast (snat_main_t *sm, vlib_node_runtime_t *node,
+ u32 sw_if_index0, ip4_header_t *ip0, u32 proto0,
+ u32 rx_fib_index0)
+{
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ nat_outside_fib_t *outside_fib;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = ip0->dst_address.as_u32,
+ }
+ ,
+ };
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE (
+ is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32)))
+ return 1;
+
+ fei = fib_table_lookup (rx_fib_index0, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ u32 sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index == ~0)
+ {
+ vec_foreach (outside_fib, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (outside_fib->fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index != ~0)
+ break;
+ }
+ }
+ }
+ if (sw_if_index == ~0)
+ return 1;
+
+ snat_interface_t *i;
+ pool_foreach (i, sm->interfaces)
+ {
+ /* NAT packet aimed at outside interface */
+ if ((nat_interface_is_outside (i)) &&
+ (sw_if_index == i->sw_if_index))
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static int
+nat_ed_alloc_addr_and_port (snat_main_t *sm, u32 rx_fib_index, u32 nat_proto,
+ u32 thread_index, ip4_address_t r_addr, u16 r_port,
+ u8 proto, u16 port_per_thread,
+ u32 snat_thread_index, snat_session_t *s,
+ ip4_address_t *outside_addr, u16 *outside_port)
+{
+ int i;
+ snat_address_t *a, *ga = 0;
+
+ const u16 port_thread_offset = (port_per_thread * snat_thread_index) + 1024;
+
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ a = sm->addresses + i;
+ switch (nat_proto)
+ {
+#define _(N, j, n, unused) \
+ case NAT_PROTOCOL_##N: \
+ if (a->fib_index == rx_fib_index) \
+ { \
+ s->o2i.match.daddr = a->addr; \
+ /* first try port suggested by caller */ \
+ u16 port = clib_net_to_host_u16 (*outside_port); \
+ u16 port_offset = port - port_thread_offset; \
+ if (port <= port_thread_offset || \
+ port > port_thread_offset + port_per_thread) \
+ { \
+ /* need to pick a different port, suggested port doesn't fit in \
+ * this thread's port range */ \
+ port_offset = snat_random_port (0, port_per_thread - 1); \
+ port = port_thread_offset + port_offset; \
+ } \
+ u16 attempts = ED_PORT_ALLOC_ATTEMPTS; \
+ do \
+ { \
+ if (NAT_PROTOCOL_ICMP == nat_proto) \
+ { \
+ s->o2i.match.sport = clib_host_to_net_u16 (port); \
+ } \
+ s->o2i.match.dport = clib_host_to_net_u16 (port); \
+ if (0 == \
+ nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 2)) \
+ { \
+ ++a->busy_##n##_port_refcounts[port]; \
+ a->busy_##n##_ports_per_thread[thread_index]++; \
+ a->busy_##n##_ports++; \
+ *outside_addr = a->addr; \
+ *outside_port = clib_host_to_net_u16 (port); \
+ return 0; \
+ } \
+ port_offset = snat_random_port (0, port_per_thread - 1); \
+ port = port_thread_offset + port_offset; \
+ --attempts; \
+ } \
+ while (attempts > 0); \
+ } \
+ else if (a->fib_index == ~0) \
+ { \
+ ga = a; \
+ } \
+ break;
+
+ foreach_nat_protocol;
+ default:
+ nat_elog_info (sm, "unknown protocol");
+ return 1;
+ }
+ }
+
+ if (ga)
+ {
+ /* fake fib_index to reuse macro */
+ rx_fib_index = ~0;
+ a = ga;
+ switch (nat_proto)
+ {
+ foreach_nat_protocol;
+ default:
+ nat_elog_info (sm, "unknown protocol");
+ return 1;
+ }
+ }
+
+#undef _
+
+ /* Totally out of translations to use... */
+ nat_ipfix_logging_addresses_exhausted (thread_index, 0);
+ return 1;
+}
+
+static_always_inline u32
+nat_outside_fib_index_lookup (snat_main_t * sm, ip4_address_t addr)
+{
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ nat_outside_fib_t *outside_fib;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {.ip4.as_u32 = addr.as_u32,}
+ ,
+ };
+ // TODO: multiple vrfs none can resolve addr
+ vec_foreach (outside_fib, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (outside_fib->fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ if (fib_entry_get_resolving_interface (fei) != ~0)
+ {
+ return outside_fib->fib_index;
+ }
+ }
+ }
+ return ~0;
+}
+
+static_always_inline int
+nat44_ed_external_sm_lookup (snat_main_t *sm, ip4_address_t match_addr,
+ u16 match_port, nat_protocol_t match_protocol,
+ u32 match_fib_index, ip4_address_t *daddr,
+ u16 *dport)
+{
+ clib_bihash_kv_8_8_t kv, value;
+ init_nat_k (&kv, match_addr, match_port, match_fib_index, match_protocol);
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ {
+ /* Try address only mapping */
+ init_nat_k (&kv, match_addr, 0, 0, 0);
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv,
+ &value))
+ return 0;
+ }
+
+ snat_static_mapping_t *m =
+ pool_elt_at_index (sm->static_mappings, value.value);
+ *daddr = m->local_addr;
+ if (dport)
+ {
+ /* Address only mapping doesn't change port */
+ *dport = is_addr_only_static_mapping (m) ? match_port : m->local_port;
+ }
+ return 1;
+}
+
+static u32
+slow_path_ed (snat_main_t *sm, vlib_buffer_t *b, ip4_address_t l_addr,
+ ip4_address_t r_addr, u16 l_port, u16 r_port, u8 proto,
+ u32 rx_fib_index, snat_session_t **sessionp,
+ vlib_node_runtime_t *node, u32 next, u32 thread_index, f64 now)
+{
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ ip4_address_t outside_addr;
+ u16 outside_port;
+ u32 outside_fib_index;
+ u8 is_identity_nat;
+
+ u32 nat_proto = ip_proto_to_nat_proto (proto);
+ snat_session_t *s = NULL;
+ lb_nat_type_t lb = 0;
+ ip4_address_t daddr = r_addr;
+ u16 dport = r_port;
+
+ if (PREDICT_TRUE (nat_proto == NAT_PROTOCOL_TCP))
+ {
+ if (PREDICT_FALSE
+ (!tcp_flags_is_init
+ (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
+ return NAT_NEXT_DROP;
+ }
+ }
+
+ if (PREDICT_FALSE
+ (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
+ {
+ if (!nat_lru_free_one (sm, thread_index, now))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_ipfix_logging_max_sessions (thread_index,
+ sm->max_translations_per_thread);
+ nat_elog_notice (sm, "maximum sessions exceeded");
+ return NAT_NEXT_DROP;
+ }
+ }
+
+ outside_fib_index = sm->outside_fib_index;
+
+ switch (vec_len (sm->outside_fibs))
+ {
+ case 0:
+ outside_fib_index = sm->outside_fib_index;
+ break;
+ case 1:
+ outside_fib_index = sm->outside_fibs[0].fib_index;
+ break;
+ default:
+ outside_fib_index = nat_outside_fib_index_lookup (sm, r_addr);
+ break;
+ }
+
+ ip4_address_t sm_addr;
+ u16 sm_port;
+ u32 sm_fib_index;
+ /* First try to match static mapping by local address and port */
+ int is_sm;
+ if (snat_static_mapping_match (sm, l_addr, l_port, rx_fib_index, nat_proto,
+ &sm_addr, &sm_port, &sm_fib_index, 0, 0, 0,
+ &lb, 0, &is_identity_nat, 0))
+ {
+ is_sm = 0;
+ }
+ else
+ {
+ is_sm = 1;
+ }
+
+ if (PREDICT_FALSE (is_sm && is_identity_nat))
+ {
+ *sessionp = NULL;
+ return next;
+ }
+
+ s = nat_ed_session_alloc (sm, thread_index, now, proto);
+ ASSERT (s);
+
+ if (!is_sm)
+ {
+ s->in2out.addr = l_addr;
+ s->in2out.port = l_port;
+ s->nat_proto = nat_proto;
+ s->in2out.fib_index = rx_fib_index;
+ s->out2in.fib_index = outside_fib_index;
+
+ // suggest using local port to allocation function
+ outside_port = l_port;
+
+ // hairpinning?
+ int is_hairpinning = nat44_ed_external_sm_lookup (
+ sm, r_addr, r_port, nat_proto, outside_fib_index, &daddr, &dport);
+ s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
+
+ // destination addr/port updated with real values in
+ // nat_ed_alloc_addr_and_port
+ nat_6t_o2i_flow_init (sm, thread_index, s, daddr, dport, daddr, 0,
+ s->out2in.fib_index, proto);
+ nat_6t_flow_daddr_rewrite_set (&s->o2i, l_addr.as_u32);
+ if (NAT_PROTOCOL_ICMP == nat_proto)
+ {
+ nat_6t_flow_icmp_id_rewrite_set (&s->o2i, l_port);
+ }
+ else
+ {
+ nat_6t_flow_dport_rewrite_set (&s->o2i, l_port);
+ }
+ nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
+
+ if (nat_ed_alloc_addr_and_port (
+ sm, rx_fib_index, nat_proto, thread_index, daddr, dport, proto,
+ sm->port_per_thread, tsm->snat_thread_index, s, &outside_addr,
+ &outside_port))
+ {
+ nat_elog_notice (sm, "addresses exhausted");
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
+ nat_ed_session_delete (sm, s, thread_index, 1);
+ return NAT_NEXT_DROP;
+ }
+ s->out2in.addr = outside_addr;
+ s->out2in.port = outside_port;
+ }
+ else
+ {
+ // static mapping
+ s->out2in.addr = outside_addr = sm_addr;
+ s->out2in.port = outside_port = sm_port;
+ s->in2out.addr = l_addr;
+ s->in2out.port = l_port;
+ s->nat_proto = nat_proto;
+ s->in2out.fib_index = rx_fib_index;
+ s->out2in.fib_index = outside_fib_index;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+
+ // hairpinning?
+ int is_hairpinning = nat44_ed_external_sm_lookup (
+ sm, r_addr, r_port, nat_proto, outside_fib_index, &daddr, &dport);
+ s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
+
+ if (NAT_PROTOCOL_ICMP == nat_proto)
+ {
+ nat_6t_o2i_flow_init (sm, thread_index, s, daddr, sm_port, sm_addr,
+ sm_port, s->out2in.fib_index, proto);
+ nat_6t_flow_icmp_id_rewrite_set (&s->o2i, l_port);
+ }
+ else
+ {
+ nat_6t_o2i_flow_init (sm, thread_index, s, daddr, dport, sm_addr,
+ sm_port, s->out2in.fib_index, proto);
+ nat_6t_flow_dport_rewrite_set (&s->o2i, l_port);
+ }
+ nat_6t_flow_daddr_rewrite_set (&s->o2i, l_addr.as_u32);
+ nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
+ if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 2))
+ {
+ nat_elog_notice (sm, "out2in key add failed");
+ goto error;
+ }
+ }
+
+ if (lb)
+ s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
+ s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
+ s->ext_host_addr = r_addr;
+ s->ext_host_port = r_port;
+
+ nat_6t_i2o_flow_init (sm, thread_index, s, l_addr, l_port, r_addr, r_port,
+ rx_fib_index, proto);
+ nat_6t_flow_saddr_rewrite_set (&s->i2o, outside_addr.as_u32);
+ nat_6t_flow_daddr_rewrite_set (&s->i2o, daddr.as_u32);
+ if (NAT_PROTOCOL_ICMP == nat_proto)
+ {
+ nat_6t_flow_icmp_id_rewrite_set (&s->i2o, outside_port);
+ }
+ else
+ {
+ nat_6t_flow_sport_rewrite_set (&s->i2o, outside_port);
+ nat_6t_flow_dport_rewrite_set (&s->i2o, dport);
+ }
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+
+ if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
+ {
+ nat_elog_notice (sm, "in2out key add failed");
+ goto error;
+ }
+
+ /* log NAT event */
+ 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, 0);
+
+ per_vrf_sessions_register_session (s, thread_index);
+
+ *sessionp = s;
+ return next;
+error:
+ if (s)
+ {
+ if (!is_sm)
+ {
+ snat_free_outside_address_and_port (sm->addresses, thread_index,
+ &outside_addr, outside_port,
+ nat_proto);
+ }
+ nat_ed_session_delete (sm, s, thread_index, 1);
+ }
+ *sessionp = s = NULL;
+ return NAT_NEXT_DROP;
+}
+
+static_always_inline int
+nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 sw_if_index, ip4_header_t * ip, u32 proto,
+ u32 rx_fib_index, u32 thread_index)
+{
+ udp_header_t *udp = ip4_next_header (ip);
+ clib_bihash_kv_16_8_t kv, value;
+
+ init_ed_k (&kv, ip->dst_address, udp->dst_port, ip->src_address,
+ udp->src_port, sm->outside_fib_index, ip->protocol);
+
+ /* NAT packet aimed at external address if has active sessions */
+ if (clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
+ {
+ /* or is static mappings */
+ ip4_address_t placeholder_addr;
+ u16 placeholder_port;
+ u32 placeholder_fib_index;
+ if (!snat_static_mapping_match
+ (sm, ip->dst_address, udp->dst_port, sm->outside_fib_index, proto,
+ &placeholder_addr, &placeholder_port, &placeholder_fib_index, 1, 0,
+ 0, 0, 0, 0, 0))
+ return 0;
+ }
+ else
+ return 0;
+
+ if (sm->forwarding_enabled)
+ return 1;
+
+ return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
+ rx_fib_index);
+}
+
+static_always_inline int
+nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
+ u32 thread_index, f64 now,
+ vlib_main_t * vm, vlib_buffer_t * b)
+{
+ clib_bihash_kv_16_8_t kv, value;
+ snat_session_t *s = 0;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+
+ if (!sm->forwarding_enabled)
+ return 0;
+
+ if (ip->protocol == IP_PROTOCOL_ICMP)
+ {
+ ip4_address_t lookup_saddr, lookup_daddr;
+ u16 lookup_sport, lookup_dport;
+ u8 lookup_protocol;
+ if (nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr,
+ &lookup_sport, &lookup_daddr,
+ &lookup_dport, &lookup_protocol))
+ return 0;
+ init_ed_k (&kv, lookup_saddr, lookup_sport, lookup_daddr, lookup_dport,
+ 0, lookup_protocol);
+ }
+ else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
+ {
+ init_ed_k (&kv, ip->src_address, vnet_buffer (b)->ip.reass.l4_src_port,
+ ip->dst_address, vnet_buffer (b)->ip.reass.l4_dst_port, 0,
+ ip->protocol);
+ }
+ else
+ {
+ init_ed_k (&kv, ip->src_address, 0, ip->dst_address, 0, 0,
+ ip->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));
+
+ if (is_fwd_bypass_session (s))
+ {
+ if (ip->protocol == IP_PROTOCOL_TCP)
+ {
+ nat44_set_tcp_session_state_i2o (sm, now, s, b, 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 1;
+ }
+ else
+ return 0;
+ }
+
+ return 0;
+}
+
+static_always_inline int
+nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
+ u16 src_port, u16 dst_port,
+ u32 thread_index, u32 rx_sw_if_index,
+ u32 tx_sw_if_index, f64 now)
+{
+ clib_bihash_kv_16_8_t kv, value;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ snat_interface_t *i;
+ snat_session_t *s;
+ u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
+ u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
+
+ /* src NAT check */
+ init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
+ tx_fib_index, ip->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));
+ if (nat44_is_ses_closed (s)
+ && (!s->tcp_closed_timestamp || now >= s->tcp_closed_timestamp))
+ {
+ nat_free_session_data (sm, s, thread_index, 0);
+ nat_ed_session_delete (sm, s, thread_index, 1);
+ }
+ return 1;
+ }
+
+ /* dst NAT check */
+ init_ed_k (&kv, ip->dst_address, dst_port, ip->src_address, src_port,
+ rx_fib_index, ip->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));
+
+ if (is_fwd_bypass_session (s))
+ return 0;
+
+ /* hairpinning */
+ pool_foreach (i, sm->output_feature_interfaces)
+ {
+ if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
+ return 0;
+ }
+ return 1;
+ }
+
+ return 0;
+}
+
+static inline u32
+icmp_in2out_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,
+ nat_protocol_t nat_proto, snat_session_t **s_p)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u16 checksum;
+ int err;
+ snat_session_t *s = NULL;
+ u8 lookup_protocol = ip->protocol;
+ u16 lookup_sport, lookup_dport;
+ ip4_address_t lookup_saddr, lookup_daddr;
+
+ err = nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr,
+ &lookup_sport, &lookup_daddr,
+ &lookup_dport, &lookup_protocol);
+ if (err != 0)
+ {
+ b->error = node->errors[err];
+ return NAT_NEXT_DROP;
+ }
+
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (
+ sm, ip, lookup_sport, lookup_dport, thread_index, sw_if_index,
+ vnet_buffer (b)->sw_if_index[VLIB_TX], now)))
+ {
+ return next;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index, ip,
+ NAT_PROTOCOL_ICMP,
+ rx_fib_index, thread_index)))
+ {
+ return next;
+ }
+ }
+
+ if (PREDICT_FALSE (icmp_type_is_error_message (
+ vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
+ return NAT_NEXT_DROP;
+ }
+
+ next = slow_path_ed (sm, b, ip->src_address, ip->dst_address, lookup_sport,
+ lookup_dport, ip->protocol, rx_fib_index, &s, node,
+ next, thread_index, vlib_time_now (vm));
+
+ if (NAT_NEXT_DROP == next)
+ goto out;
+
+ if (PREDICT_TRUE (!ip4_is_fragment (ip)))
+ {
+ ip_csum_t 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 (PREDICT_FALSE (checksum != 0 && checksum != 0xffff))
+ {
+ next = NAT_NEXT_DROP;
+ goto out;
+ }
+ }
+
+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);
+ }
+ *s_p = s;
+ return next;
+}
+
+static snat_session_t *
+nat44_ed_in2out_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;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ snat_static_mapping_t *m = NULL;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ snat_session_t *s = NULL;
+ u32 outside_fib_index = sm->outside_fib_index;
+ int i;
+ ip4_address_t new_src_addr = { 0 };
+ ip4_address_t new_dst_addr = ip->dst_address;
+
+ if (PREDICT_FALSE (
+ nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_ipfix_logging_max_sessions (thread_index,
+ sm->max_translations_per_thread);
+ nat_elog_notice (sm, "maximum sessions exceeded");
+ return 0;
+ }
+
+ switch (vec_len (sm->outside_fibs))
+ {
+ case 0:
+ outside_fib_index = sm->outside_fib_index;
+ break;
+ case 1:
+ outside_fib_index = sm->outside_fibs[0].fib_index;
+ break;
+ default:
+ outside_fib_index = nat_outside_fib_index_lookup (sm, ip->dst_address);
+ break;
+ }
+
+ init_nat_k (&kv, ip->src_address, 0, rx_fib_index, 0);
+
+ /* Try to find static mapping first */
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
+ {
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ new_src_addr = m->external_addr;
+ }
+ else
+ {
+ pool_foreach (s, tsm->sessions)
+ {
+ if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
+ {
+ init_ed_k (&s_kv, s->out2in.addr, 0, ip->dst_address, 0,
+ outside_fib_index, ip->protocol);
+ if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
+ {
+ new_src_addr = s->out2in.addr;
+ }
+ break;
+ }
+ }
+
+ if (!new_src_addr.as_u32)
+ {
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ init_ed_k (&s_kv, sm->addresses[i].addr, 0, ip->dst_address, 0,
+ outside_fib_index, ip->protocol);
+ if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
+ {
+ new_src_addr = sm->addresses[i].addr;
+ }
+ }
+ }
+ }
+
+ if (!new_src_addr.as_u32)
+ {
+ // could not allocate address for translation ...
+ return 0;
+ }
+
+ s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
+ if (!s)
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_elog_warn (sm, "create NAT session failed");
+ return 0;
+ }
+
+ nat_6t_i2o_flow_init (sm, thread_index, s, ip->src_address, 0,
+ ip->dst_address, 0, rx_fib_index, ip->protocol);
+ nat_6t_flow_saddr_rewrite_set (&s->i2o, new_src_addr.as_u32);
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+
+ // hairpinning?
+ int is_hairpinning =
+ nat44_ed_external_sm_lookup (sm, ip->dst_address, 0, NAT_PROTOCOL_OTHER,
+ outside_fib_index, &new_dst_addr, NULL);
+ s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
+
+ nat_6t_flow_daddr_rewrite_set (&s->i2o, new_dst_addr.as_u32);
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+
+ nat_6t_o2i_flow_init (sm, thread_index, s, new_dst_addr, 0, new_src_addr, 0,
+ outside_fib_index, ip->protocol);
+ nat_6t_flow_saddr_rewrite_set (&s->o2i, ip->dst_address.as_u32);
+ nat_6t_flow_daddr_rewrite_set (&s->o2i, ip->src_address.as_u32);
+ nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
+
+ s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
+ s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
+ s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
+ s->out2in.addr.as_u32 = new_src_addr.as_u32;
+ s->out2in.fib_index = outside_fib_index;
+ s->in2out.addr.as_u32 = ip->src_address.as_u32;
+ s->in2out.fib_index = rx_fib_index;
+ s->in2out.port = s->out2in.port = ip->protocol;
+ if (m)
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+
+ if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
+ {
+ nat_elog_notice (sm, "in2out flow hash add failed");
+ nat_ed_session_delete (sm, s, thread_index, 1);
+ return NULL;
+ }
+
+ 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_in2out_fast_path_node_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ int is_output_feature)
+{
+ 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];
+ u32 def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH
+ : NAT_NEXT_IN2OUT_ED_SLOW_PATH;
+
+ 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, iph_offset0 = 0;
+ 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++;
+
+ /* 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);
+ }
+
+ if (is_output_feature)
+ {
+ iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
+ }
+
+ next[0] = vnet_buffer2 (b0)->nat.arc_next;
+
+ ip0 =
+ (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0);
+
+ 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 (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat_not_translate_output_feature_fwd
+ (sm, ip0, thread_index, now, vm, b0)))
+ goto trace0;
+ }
+
+ 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_IN2OUT_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_protocol = ip0->protocol;
+ lookup_saddr = ip0->src_address;
+ lookup_daddr = ip0->dst_address;
+ lookup_sport = vnet_buffer (b0)->ip.reass.l4_src_port;
+ lookup_dport = vnet_buffer (b0)->ip.reass.l4_dst_port;
+ }
+
+ /* 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->i2o, b0, lookup_saddr, lookup_sport,
+ lookup_daddr, lookup_dport, lookup_protocol,
+ rx_fib_index0)
+ // for some hairpinning cases there are two "i2i" flows instead
+ // of i2o and o2i as both hosts are on inside
+ || (s0->flags & SNAT_SESSION_FLAG_HAIRPINNING &&
+ nat_6t_flow_match (
+ &s0->o2i, 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, ip0->src_address, lookup_sport, ip0->dst_address,
+ 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] = def_slow;
+ 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] = def_slow;
+ }
+ else
+ {
+ // session in transitory timeout, drop
+ b0->error = node->errors[NAT_IN2OUT_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)
+ {
+ nat_free_session_data (sm, s0, thread_index, 0);
+ nat_ed_session_delete (sm, s0, thread_index, 1);
+ // session is closed, go slow path
+ next[0] = def_slow;
+ goto trace0;
+ }
+
+ b0->flags |= VNET_BUFFER_F_IS_NATED;
+
+ 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 if (s0->flags & SNAT_SESSION_FLAG_HAIRPINNING &&
+ nat_6t_flow_match (&s0->o2i, b0, lookup_saddr, lookup_sport,
+ lookup_daddr, lookup_dport, lookup_protocol,
+ rx_fib_index0))
+ {
+ f = &s0->o2i;
+ }
+ else
+ {
+ 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, is_output_feature)))
+ {
+ 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;
+ }
+
+ switch (proto0)
+ {
+ case NAT_PROTOCOL_TCP:
+ vlib_increment_simple_counter (&sm->counters.fastpath.in2out.tcp,
+ thread_index, sw_if_index0, 1);
+ nat44_set_tcp_session_state_i2o (sm, now, s0, b0, thread_index);
+ break;
+ case NAT_PROTOCOL_UDP:
+ vlib_increment_simple_counter (&sm->counters.fastpath.in2out.udp,
+ thread_index, sw_if_index0, 1);
+ break;
+ case NAT_PROTOCOL_ICMP:
+ vlib_increment_simple_counter (&sm->counters.fastpath.in2out.icmp,
+ thread_index, sw_if_index0, 1);
+ break;
+ case NAT_PROTOCOL_OTHER:
+ vlib_increment_simple_counter (&sm->counters.fastpath.in2out.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)))
+ {
+ nat_in2out_ed_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;
+ t->lookup_skipped = lookup_skipped;
+ 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));
+ 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.in2out.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_in2out_slow_path_node_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ int is_output_feature)
+{
+ 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, iph_offset0 = 0;
+ 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;
+ int translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
+
+ b0 = *b;
+
+ if (is_output_feature)
+ iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
+
+ next[0] = vnet_buffer2 (b0)->nat.arc_next;
+
+ ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
+ iph_offset0);
+
+ 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_in2out_slowpath_unknown_proto (
+ sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node);
+ if (!s0)
+ next[0] = NAT_NEXT_DROP;
+
+ if (NAT_ED_TRNSL_ERR_SUCCESS !=
+ (translation_error = nat_6t_flow_buf_translate (
+ sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
+ {
+ goto trace0;
+ }
+
+ vlib_increment_simple_counter (&sm->counters.slowpath.in2out.other,
+ thread_index, sw_if_index0, 1);
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ next[0] = icmp_in2out_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next[0],
+ now, thread_index, proto0, &s0);
+ if (NAT_NEXT_DROP != next[0] && s0 &&
+ NAT_ED_TRNSL_ERR_SUCCESS !=
+ (translation_error = nat_6t_flow_buf_translate (
+ sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
+ {
+ goto trace0;
+ }
+
+ vlib_increment_simple_counter (&sm->counters.slowpath.in2out.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);
+ 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)
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate_output_feature
+ (sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
+ vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
+ sw_if_index0, vnet_buffer (b0)->sw_if_index[VLIB_TX],
+ now)))
+ goto trace0;
+
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_FALSE
+ (proto0 == NAT_PROTOCOL_UDP
+ && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
+ clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server))
+ && ip0->dst_address.as_u32 == 0xffffffff))
+ goto trace0;
+ }
+ else
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate
+ (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
+ thread_index)))
+ goto trace0;
+ }
+
+ next[0] =
+ slow_path_ed (sm, b0, ip0->src_address, ip0->dst_address,
+ vnet_buffer (b0)->ip.reass.l4_src_port,
+ vnet_buffer (b0)->ip.reass.l4_dst_port,
+ ip0->protocol, rx_fib_index0, &s0, node, next[0],
+ thread_index, now);
+
+ if (PREDICT_FALSE (next[0] == NAT_NEXT_DROP))
+ goto trace0;
+
+ if (PREDICT_FALSE (!s0))
+ goto trace0;
+
+ }
+
+ b0->flags |= VNET_BUFFER_F_IS_NATED;
+
+ if (NAT_ED_TRNSL_ERR_SUCCESS !=
+ (translation_error = nat_6t_flow_buf_translate (
+ sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
+ {
+ nat_free_session_data (sm, s0, thread_index, 0);
+ nat_ed_session_delete (sm, s0, thread_index, 1);
+ s0 = NULL;
+ goto trace0;
+ }
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.in2out.tcp,
+ thread_index, sw_if_index0, 1);
+ nat44_set_tcp_session_state_i2o (sm, now, s0, b0, thread_index);
+ }
+ else
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.in2out.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)))
+ {
+ nat_in2out_ed_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));
+ t->translation_via_i2of = 1;
+ }
+
+ else
+ {
+ t->session_index = ~0;
+ }
+ }
+
+ if (next[0] == NAT_NEXT_DROP)
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.in2out.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_in2out_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0);
+}
+
+VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
+ .name = "nat44-ed-in2out",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_in2out_ed_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+};
+
+VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1);
+}
+
+VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
+ .name = "nat44-ed-in2out-output",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_in2out_ed_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+};
+
+VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
+ vlib_node_runtime_t *
+ node, vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0);
+}
+
+VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
+ .name = "nat44-ed-in2out-slowpath",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_in2out_ed_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+};
+
+VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
+ vlib_node_runtime_t
+ * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1);
+}
+
+VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
+ .name = "nat44-ed-in2out-output-slowpath",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_in2out_ed_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+};
+
+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, "in2out next_index %d arc_next_index %d", t->next_index,
+ t->arc_next_index);
+}
+
+VLIB_NODE_FN (nat_pre_in2out_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_IN2OUT_ED_FAST_PATH);
+}
+
+VLIB_NODE_FN (nat_pre_in2out_output_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_IN2OUT_ED_OUTPUT_FAST_PATH);
+}
+
+VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
+ .name = "nat-pre-in2out",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_pre_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = 0,
+};
+
+VLIB_REGISTER_NODE (nat_pre_in2out_output_node) = {
+ .name = "nat-pre-in2out-output",
+ .vector_size = sizeof (u32),
+ .sibling_of = "nat-default",
+ .format_trace = format_nat_pre_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = 0,
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */