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-rw-r--r--src/plugins/nat/in2out_ed.c2067
1 files changed, 2067 insertions, 0 deletions
diff --git a/src/plugins/nat/in2out_ed.c b/src/plugins/nat/in2out_ed.c
new file mode 100644
index 00000000000..d4f70f5a12b
--- /dev/null
+++ b/src/plugins/nat/in2out_ed.c
@@ -0,0 +1,2067 @@
+/*
+ * 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/pg/pg.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vppinfra/error.h>
+#include <nat/nat.h>
+#include <nat/nat_ipfix_logging.h>
+#include <nat/nat_reass.h>
+#include <nat/nat_inlines.h>
+
+#define foreach_nat_in2out_ed_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(IN2OUT_PACKETS, "Good in2out packets processed") \
+_(OUT_OF_PORTS, "Out of ports") \
+_(BAD_ICMP_TYPE, "unsupported ICMP type") \
+_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
+
+typedef enum
+{
+#define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
+ foreach_nat_in2out_ed_error
+#undef _
+ NAT_IN2OUT_ED_N_ERROR,
+} nat_in2out_ed_error_t;
+
+static char *nat_in2out_ed_error_strings[] = {
+#define _(sym,string) string,
+ foreach_nat_in2out_ed_error
+#undef _
+};
+
+typedef enum
+{
+ NAT_IN2OUT_ED_NEXT_LOOKUP,
+ NAT_IN2OUT_ED_NEXT_DROP,
+ NAT_IN2OUT_ED_NEXT_ICMP_ERROR,
+ NAT_IN2OUT_ED_NEXT_SLOW_PATH,
+ NAT_IN2OUT_ED_NEXT_REASS,
+ NAT_IN2OUT_ED_N_NEXT,
+} nat_in2out_ed_next_t;
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+ u32 is_slow_path;
+} nat_in2out_ed_trace_t;
+
+vlib_node_registration_t nat44_ed_in2out_node;
+vlib_node_registration_t nat44_ed_in2out_slowpath_node;
+vlib_node_registration_t nat44_ed_in2out_output_node;
+vlib_node_registration_t nat44_ed_in2out_output_slowpath_node;
+vlib_node_registration_t nat44_ed_in2out_reass_node;
+
+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);
+
+ return s;
+}
+
+static_always_inline int
+icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0)
+{
+ icmp46_header_t *icmp0;
+ nat_ed_ses_key_t key0;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0 = 0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ key0.proto = IP_PROTOCOL_ICMP;
+ key0.l_addr = ip0->src_address;
+ key0.r_addr = ip0->dst_address;
+ key0.l_port = echo0->identifier;
+ key0.r_port = 0;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *) (echo0 + 1);
+ l4_header = ip4_next_header (inner_ip0);
+ key0.proto = inner_ip0->protocol;
+ key0.r_addr = inner_ip0->src_address;
+ key0.l_addr = inner_ip0->dst_address;
+ switch (ip_proto_to_snat_proto (inner_ip0->protocol))
+ {
+ case SNAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+ key0.r_port = 0;
+ key0.l_port = inner_echo0->identifier;
+ break;
+ case SNAT_PROTOCOL_UDP:
+ case SNAT_PROTOCOL_TCP:
+ key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
+ key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port;
+ break;
+ default:
+ return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
+ }
+ }
+ *p_key0 = key0;
+ return 0;
+}
+
+int
+nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
+{
+ snat_main_t *sm = &snat_main;
+ nat44_is_idle_session_ctx_t *ctx = arg;
+ snat_session_t *s;
+ u64 sess_timeout_time;
+ nat_ed_ses_key_t ed_key;
+ clib_bihash_kv_16_8_t ed_kv;
+ int i;
+ snat_address_t *a;
+ snat_session_key_t key;
+ snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
+ ctx->thread_index);
+
+ s = pool_elt_at_index (tsm->sessions, kv->value);
+ sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
+ if (ctx->now >= sess_timeout_time)
+ {
+ if (is_fwd_bypass_session (s))
+ goto delete;
+
+ ed_key.l_addr = s->out2in.addr;
+ ed_key.r_addr = s->ext_host_addr;
+ ed_key.fib_index = s->out2in.fib_index;
+ if (snat_is_unk_proto_session (s))
+ {
+ ed_key.proto = s->in2out.port;
+ ed_key.r_port = 0;
+ ed_key.l_port = 0;
+ }
+ else
+ {
+ ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
+ ed_key.l_port = s->out2in.port;
+ ed_key.r_port = s->ext_host_port;
+ }
+ ed_kv.key[0] = ed_key.as_u64[0];
+ ed_kv.key[1] = ed_key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
+ nat_log_warn ("out2in_ed key del failed");
+
+ if (snat_is_unk_proto_session (s))
+ goto delete;
+
+ snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->in2out.protocol,
+ s->in2out.port,
+ s->out2in.port,
+ s->in2out.fib_index);
+
+ if (is_twice_nat_session (s))
+ {
+ for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
+ {
+ key.protocol = s->in2out.protocol;
+ key.port = s->ext_host_nat_port;
+ a = sm->twice_nat_addresses + i;
+ if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
+ {
+ snat_free_outside_address_and_port (sm->twice_nat_addresses,
+ ctx->thread_index,
+ &key);
+ break;
+ }
+ }
+ }
+
+ if (snat_is_session_static (s))
+ goto delete;
+
+ snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
+ &s->out2in);
+ delete:
+ nat44_delete_session (sm, s, ctx->thread_index);
+ return 1;
+ }
+
+ return 0;
+}
+
+static inline u32
+icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
+ ip4_header_t * ip0, icmp46_header_t * icmp0,
+ u32 sw_if_index0, u32 rx_fib_index0,
+ vlib_node_runtime_t * node, u32 next0, f64 now,
+ u32 thread_index, snat_session_t ** p_s0)
+{
+ next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, thread_index, p_s0, 0);
+ snat_session_t *s0 = *p_s0;
+ if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
+ {
+ /* Hairpinning */
+ if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
+ snat_icmp_hairpinning (sm, b0, ip0, icmp0, sm->endpoint_dependent);
+ /* Accounting */
+ nat44_session_update_counters (s0, now,
+ vlib_buffer_length_in_chain
+ (sm->vlib_main, b0));
+ }
+ return next0;
+}
+
+static u32
+slow_path_ed (snat_main_t * sm,
+ vlib_buffer_t * b,
+ u32 rx_fib_index,
+ clib_bihash_kv_16_8_t * kv,
+ snat_session_t ** sessionp,
+ vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now)
+{
+ snat_session_t *s;
+ snat_user_t *u;
+ snat_session_key_t key0, key1;
+ lb_nat_type_t lb = 0, is_sm = 0;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
+ u32 proto = ip_proto_to_snat_proto (key->proto);
+ nat_outside_fib_t *outside_fib;
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = key->r_addr.as_u32,
+ },
+ };
+ nat44_is_idle_session_ctx_t ctx;
+
+ if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_ipfix_logging_max_sessions (sm->max_translations);
+ nat_log_notice ("maximum sessions exceeded");
+ return NAT_IN2OUT_ED_NEXT_DROP;
+ }
+
+ key0.addr = key->l_addr;
+ key0.port = key->l_port;
+ key1.protocol = key0.protocol = proto;
+ key0.fib_index = rx_fib_index;
+ key1.fib_index = sm->outside_fib_index;
+ /* First try to match static mapping by local address and port */
+ if (snat_static_mapping_match (sm, key0, &key1, 0, 0, 0, &lb, 0))
+ {
+ /* Try to create dynamic translation */
+ if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
+ thread_index, &key1,
+ sm->port_per_thread,
+ tsm->snat_thread_index))
+ {
+ nat_log_notice ("addresses exhausted");
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
+ return NAT_IN2OUT_ED_NEXT_DROP;
+ }
+ }
+ else
+ is_sm = 1;
+
+ u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
+ if (!u)
+ {
+ nat_log_warn ("create NAT user failed");
+ if (!is_sm)
+ snat_free_outside_address_and_port (sm->addresses,
+ thread_index, &key1);
+ return NAT_IN2OUT_ED_NEXT_DROP;
+ }
+
+ s = nat_ed_session_alloc (sm, u, thread_index);
+ if (!s)
+ {
+ nat44_delete_user_with_no_session (sm, u, thread_index);
+ nat_log_warn ("create NAT session failed");
+ if (!is_sm)
+ snat_free_outside_address_and_port (sm->addresses,
+ thread_index, &key1);
+ return NAT_IN2OUT_ED_NEXT_DROP;
+ }
+
+ user_session_increment (sm, u, is_sm);
+ if (is_sm)
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ if (lb)
+ s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
+ s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
+ s->ext_host_addr = key->r_addr;
+ s->ext_host_port = key->r_port;
+ s->in2out = key0;
+ s->out2in = key1;
+ s->out2in.protocol = key0.protocol;
+
+ switch (vec_len (sm->outside_fibs))
+ {
+ case 0:
+ s->out2in.fib_index = sm->outside_fib_index;
+ break;
+ case 1:
+ s->out2in.fib_index = sm->outside_fibs[0].fib_index;
+ break;
+ default:
+ /* *INDENT-OFF* */
+ 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)
+ {
+ s->out2in.fib_index = outside_fib->fib_index;
+ break;
+ }
+ }
+ }
+ /* *INDENT-ON* */
+ break;
+ }
+
+ /* Add to lookup tables */
+ kv->value = s - tsm->sessions;
+ ctx.now = now;
+ ctx.thread_index = thread_index;
+ if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
+ nat44_i2o_ed_is_idle_session_cb,
+ &ctx))
+ nat_log_notice ("in2out-ed key add failed");
+
+ make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
+ key1.port, key->r_port);
+ kv->value = s - tsm->sessions;
+ if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
+ nat44_o2i_ed_is_idle_session_cb,
+ &ctx))
+ nat_log_notice ("out2in-ed key add failed");
+
+ *sessionp = s;
+
+ /* log NAT event */
+ snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->in2out.protocol,
+ s->in2out.port,
+ s->out2in.port, s->in2out.fib_index);
+ return next;
+}
+
+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);
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ clib_bihash_kv_16_8_t kv, value;
+ snat_session_key_t key0, key1;
+
+ make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
+ sm->outside_fib_index, udp->dst_port, udp->src_port);
+
+ /* NAT packet aimed at external address if */
+ /* has active sessions */
+ if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
+ {
+ key0.addr = ip->dst_address;
+ key0.port = udp->dst_port;
+ key0.protocol = proto;
+ key0.fib_index = sm->outside_fib_index;
+ /* or is static mappings */
+ if (!snat_static_mapping_match (sm, key0, &key1, 1, 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)
+{
+ nat_ed_ses_key_t key;
+ clib_bihash_kv_16_8_t kv, value;
+ udp_header_t *udp;
+ 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)
+ {
+ key.as_u64[0] = key.as_u64[1] = 0;
+ if (icmp_get_ed_key (ip, &key))
+ return 0;
+ key.fib_index = 0;
+ kv.key[0] = key.as_u64[0];
+ kv.key[1] = key.as_u64[1];
+ }
+ else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
+ {
+ udp = ip4_next_header (ip);
+ make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
+ udp->src_port, udp->dst_port);
+ }
+ else
+ {
+ make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
+ 0);
+ }
+
+ if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
+ {
+ s = pool_elt_at_index (tsm->sessions, value.value);
+ if (is_fwd_bypass_session (s))
+ {
+ if (ip->protocol == IP_PROTOCOL_TCP)
+ {
+ tcp_header_t *tcp = ip4_next_header (ip);
+ if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
+ return 1;
+ }
+ /* Accounting */
+ nat44_session_update_counters (s, now,
+ vlib_buffer_length_in_chain (vm, b));
+ 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,
+ u8 proto, u16 src_port, u16 dst_port,
+ u32 thread_index, u32 rx_sw_if_index,
+ u32 tx_sw_if_index)
+{
+ 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 */
+ make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
+ src_port, dst_port);
+ if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
+ return 1;
+
+ /* dst NAT check */
+ make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
+ dst_port, src_port);
+ if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
+ {
+ s = pool_elt_at_index (tsm->sessions, value.value);
+ if (is_fwd_bypass_session (s))
+ return 0;
+
+ /* hairpinning */
+ /* *INDENT-OFF* */
+ pool_foreach (i, sm->output_feature_interfaces,
+ ({
+ if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
+ return 0;
+ }));
+ /* *INDENT-ON* */
+ return 1;
+ }
+
+ return 0;
+}
+
+u32
+icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
+ u8 * p_proto, snat_session_key_t * p_value,
+ u8 * p_dont_translate, void *d, void *e)
+{
+ icmp46_header_t *icmp;
+ u32 sw_if_index;
+ u32 rx_fib_index;
+ nat_ed_ses_key_t key;
+ snat_session_t *s = 0;
+ u8 dont_translate = 0;
+ clib_bihash_kv_16_8_t kv, value;
+ u32 next = ~0;
+ int err;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+
+ icmp = (icmp46_header_t *) ip4_next_header (ip);
+ 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);
+
+ key.as_u64[0] = key.as_u64[1] = 0;
+ err = icmp_get_ed_key (ip, &key);
+ if (err != 0)
+ {
+ b->error = node->errors[err];
+ next = NAT_IN2OUT_ED_NEXT_DROP;
+ goto out;
+ }
+ key.fib_index = rx_fib_index;
+
+ kv.key[0] = key.as_u64[0];
+ kv.key[1] = key.as_u64[1];
+
+ if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
+ {
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
+ key.proto,
+ key.
+ l_port,
+ key.
+ r_port,
+ thread_index,
+ sw_if_index,
+ vnet_buffer
+ (b)->
+ sw_if_index
+ [VLIB_TX])))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
+ ip, SNAT_PROTOCOL_ICMP,
+ rx_fib_index,
+ thread_index)))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+ }
+
+ if (PREDICT_FALSE (icmp_is_error_message (icmp)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
+ next = NAT_IN2OUT_ED_NEXT_DROP;
+ goto out;
+ }
+
+ next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
+ thread_index, vlib_time_now (sm->vlib_main));
+
+ if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
+ goto out;
+ }
+ else
+ {
+ if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
+ icmp->type != ICMP4_echo_reply &&
+ !icmp_is_error_message (icmp)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
+ next = NAT_IN2OUT_ED_NEXT_DROP;
+ goto out;
+ }
+
+ s = pool_elt_at_index (tsm->sessions, value.value);
+ }
+
+ *p_proto = ip_proto_to_snat_proto (key.proto);
+out:
+ if (s)
+ *p_value = s->out2in;
+ *p_dont_translate = dont_translate;
+ if (d)
+ *(snat_session_t **) d = s;
+ return next;
+}
+
+static snat_session_t *
+nat44_ed_in2out_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;
+ u32 old_addr, new_addr = 0;
+ ip_csum_t sum;
+ snat_user_t *u;
+ dlist_elt_t *head, *elt;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ u32 elt_index, head_index, ses_index;
+ snat_session_t *s;
+ u32 outside_fib_index = sm->outside_fib_index;
+ int i;
+ u8 is_sm = 0;
+ nat_outside_fib_t *outside_fib;
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = ip->dst_address.as_u32,
+ },
+ };
+
+ 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:
+ /* *INDENT-OFF* */
+ 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)
+ {
+ outside_fib_index = outside_fib->fib_index;
+ break;
+ }
+ }
+ }
+ /* *INDENT-ON* */
+ break;
+ }
+ old_addr = ip->src_address.as_u32;
+
+ make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
+ rx_fib_index, 0, 0);
+
+ if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
+ {
+ s = pool_elt_at_index (tsm->sessions, s_value.value);
+ new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
+ }
+ else
+ {
+ if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
+ {
+ b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_ipfix_logging_max_sessions (sm->max_translations);
+ nat_log_notice ("maximum sessions exceeded");
+ return 0;
+ }
+
+ u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
+ thread_index);
+ if (!u)
+ {
+ nat_log_warn ("create NAT user failed");
+ return 0;
+ }
+
+ make_sm_kv (&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_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
+ is_sm = 1;
+ goto create_ses;
+ }
+ /* Fallback to 3-tuple key */
+ else
+ {
+ /* Choose same out address as for TCP/UDP session to same destination */
+ head_index = u->sessions_per_user_list_head_index;
+ head = pool_elt_at_index (tsm->list_pool, head_index);
+ elt_index = head->next;
+ if (PREDICT_FALSE (elt_index == ~0))
+ ses_index = ~0;
+ else
+ {
+ elt = pool_elt_at_index (tsm->list_pool, elt_index);
+ ses_index = elt->value;
+ }
+
+ while (ses_index != ~0)
+ {
+ s = pool_elt_at_index (tsm->sessions, ses_index);
+ elt_index = elt->next;
+ elt = pool_elt_at_index (tsm->list_pool, elt_index);
+ ses_index = elt->value;
+
+ if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
+ {
+ new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
+
+ make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
+ ip->protocol, outside_fib_index, 0, 0);
+ if (clib_bihash_search_16_8
+ (&tsm->out2in_ed, &s_kv, &s_value))
+ goto create_ses;
+
+ break;
+ }
+ }
+
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
+ ip->protocol, outside_fib_index, 0, 0);
+ if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
+ {
+ new_addr = ip->src_address.as_u32 =
+ sm->addresses[i].addr.as_u32;
+ goto create_ses;
+ }
+ }
+ return 0;
+ }
+
+ create_ses:
+ s = nat_ed_session_alloc (sm, u, thread_index);
+ if (!s)
+ {
+ nat44_delete_user_with_no_session (sm, u, thread_index);
+ nat_log_warn ("create NAT session failed");
+ return 0;
+ }
+
+ 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_addr;
+ s->out2in.fib_index = outside_fib_index;
+ s->in2out.addr.as_u32 = old_addr;
+ s->in2out.fib_index = rx_fib_index;
+ s->in2out.port = s->out2in.port = ip->protocol;
+ if (is_sm)
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ user_session_increment (sm, u, is_sm);
+
+ /* Add to lookup tables */
+ make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
+ rx_fib_index, 0, 0);
+ s_kv.value = s - tsm->sessions;
+ if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
+ nat_log_notice ("in2out key add failed");
+
+ make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
+ outside_fib_index, 0, 0);
+ s_kv.value = s - tsm->sessions;
+ if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
+ nat_log_notice ("out2in key add failed");
+ }
+
+ /* Update IP checksum */
+ sum = ip->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
+ ip->checksum = ip_csum_fold (sum);
+
+ /* Accounting */
+ nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
+
+ /* Hairpinning */
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
+ nat44_ed_hairpinning_unknown_proto (sm, b, ip);
+
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
+
+ return s;
+}
+
+static inline uword
+nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_slow_path,
+ int is_output_feature)
+{
+ u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
+ nat_in2out_ed_next_t next_index;
+ 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];
+
+ stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
+ nat44_ed_in2out_node.index;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
+ new_addr0, old_addr0;
+ u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
+ new_addr1, old_addr1;
+ u16 old_port0, new_port0, old_port1, new_port1;
+ ip4_header_t *ip0, *ip1;
+ udp_header_t *udp0, *udp1;
+ tcp_header_t *tcp0, *tcp1;
+ icmp46_header_t *icmp0, *icmp1;
+ snat_session_t *s0 = 0, *s1 = 0;
+ clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
+ ip_csum_t sum0, sum1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ /* speculatively enqueue b0 and b1 to the current next frame */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
+
+ if (is_output_feature)
+ iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
+
+ 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);
+ next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
+ rx_fib_index0,
+ thread_index, now, vm,
+ node);
+ if (!s0)
+ next0 = NAT_IN2OUT_ED_NEXT_DROP;
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out_ed_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+ goto trace00;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace00;
+ }
+
+ if (ip4_is_fragment (ip0))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_REASS;
+ goto trace00;
+ }
+
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat_not_translate_output_feature_fwd
+ (sm, ip0, thread_index, now, vm, b0)))
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace00;
+ }
+ }
+
+ make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
+ ip0->protocol, rx_fib_index0, udp0->src_port,
+ udp0->dst_port);
+
+ if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
+ {
+ if (is_slow_path)
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate_output_feature
+ (sm, ip0, ip0->protocol, udp0->src_port,
+ udp0->dst_port, thread_index, sw_if_index0,
+ vnet_buffer (b0)->sw_if_index[VLIB_TX])))
+ goto trace00;
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
+ sw_if_index0,
+ ip0, proto0,
+ rx_fib_index0,
+ thread_index)))
+ goto trace00;
+ }
+
+ next0 =
+ slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
+ next0, thread_index, now);
+
+ if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
+ goto trace00;
+ }
+ else
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace00;
+ }
+ }
+ else
+ {
+ s0 = pool_elt_at_index (tsm->sessions, value0.value);
+ }
+
+ b0->flags |= VNET_BUFFER_F_IS_NATED;
+
+ if (!is_output_feature)
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+
+ old_addr0 = ip0->src_address.as_u32;
+ new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ src_address);
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32, ip4_header_t,
+ dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->src_port;
+ new_port0 = tcp0->src_port = s0->out2in.port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
+ length);
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, tcp0->dst_port,
+ s0->ext_host_port, ip4_header_t,
+ length);
+ tcp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ mss_clamping (sm, tcp0, &sum0);
+ tcp0->checksum = ip_csum_fold (sum0);
+ if (nat44_set_tcp_session_state_i2o
+ (sm, s0, tcp0, thread_index))
+ goto trace00;
+ }
+ else
+ {
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ udp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ }
+
+ /* Accounting */
+ nat44_session_update_counters (s0, now,
+ vlib_buffer_length_in_chain (vm,
+ b0));
+
+ trace00:
+ 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->is_slow_path = is_slow_path;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (s0)
+ t->session_index = s0 - tsm->sessions;
+ }
+
+ pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
+
+
+ next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
+
+ if (is_output_feature)
+ iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
+
+ ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
+ iph_offset1);
+
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+ rx_fib_index1 =
+ fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
+ sw_if_index1);
+
+ if (PREDICT_FALSE (ip1->ttl == 1))
+ {
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
+ goto trace01;
+ }
+
+ udp1 = ip4_next_header (ip1);
+ tcp1 = (tcp_header_t *) udp1;
+ icmp1 = (icmp46_header_t *) udp1;
+ proto1 = ip_proto_to_snat_proto (ip1->protocol);
+
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto1 == ~0))
+ {
+ s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
+ rx_fib_index1,
+ thread_index, now, vm,
+ node);
+ if (!s1)
+ next1 = NAT_IN2OUT_ED_NEXT_DROP;
+ goto trace01;
+ }
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = icmp_in2out_ed_slow_path
+ (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
+ next1, now, thread_index, &s1);
+ goto trace01;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (proto1 == ~0))
+ {
+ next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace01;
+ }
+
+ if (ip4_is_fragment (ip1))
+ {
+ next1 = NAT_IN2OUT_ED_NEXT_REASS;
+ goto trace01;
+ }
+
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat_not_translate_output_feature_fwd
+ (sm, ip1, thread_index, now, vm, b1)))
+ goto trace01;
+ }
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace01;
+ }
+ }
+
+ make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
+ ip1->protocol, rx_fib_index1, udp1->src_port,
+ udp1->dst_port);
+
+ if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
+ {
+ if (is_slow_path)
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate_output_feature
+ (sm, ip1, ip1->protocol, udp1->src_port,
+ udp1->dst_port, thread_index, sw_if_index1,
+ vnet_buffer (b1)->sw_if_index[VLIB_TX])))
+ goto trace01;
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
+ sw_if_index1,
+ ip1, proto1,
+ rx_fib_index1,
+ thread_index)))
+ goto trace01;
+ }
+
+ next1 =
+ slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
+ next1, thread_index, now);
+
+ if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
+ goto trace01;
+ }
+ else
+ {
+ next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace01;
+ }
+ }
+ else
+ {
+ s1 = pool_elt_at_index (tsm->sessions, value1.value);
+ }
+
+ b1->flags |= VNET_BUFFER_F_IS_NATED;
+
+ if (!is_output_feature)
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
+
+ old_addr1 = ip1->src_address.as_u32;
+ new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
+ sum1 = ip1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
+ src_address);
+ if (PREDICT_FALSE (is_twice_nat_session (s1)))
+ sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
+ s1->ext_host_addr.as_u32, ip4_header_t,
+ dst_address);
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
+ {
+ old_port1 = tcp1->src_port;
+ new_port1 = tcp1->src_port = s1->out2in.port;
+
+ sum1 = tcp1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
+ dst_address);
+ sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
+ length);
+ if (PREDICT_FALSE (is_twice_nat_session (s1)))
+ {
+ sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
+ s1->ext_host_addr.as_u32,
+ ip4_header_t, dst_address);
+ sum1 = ip_csum_update (sum1, tcp1->dst_port,
+ s1->ext_host_port, ip4_header_t,
+ length);
+ tcp1->dst_port = s1->ext_host_port;
+ ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
+ }
+ tcp1->checksum = ip_csum_fold (sum1);
+ mss_clamping (sm, tcp1, &sum1);
+ if (nat44_set_tcp_session_state_i2o
+ (sm, s1, tcp1, thread_index))
+ goto trace01;
+ }
+ else
+ {
+ udp1->src_port = s1->out2in.port;
+ udp1->checksum = 0;
+ if (PREDICT_FALSE (is_twice_nat_session (s1)))
+ {
+ udp1->dst_port = s1->ext_host_port;
+ ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
+ }
+ }
+
+ /* Accounting */
+ nat44_session_update_counters (s1, now,
+ vlib_buffer_length_in_chain (vm,
+ b1));
+
+ trace01:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat_in2out_ed_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->is_slow_path = is_slow_path;
+ t->sw_if_index = sw_if_index1;
+ t->next_index = next1;
+ t->session_index = ~0;
+ if (s1)
+ t->session_index = s1 - tsm->sessions;
+ }
+
+ pkts_processed += next1 != NAT_IN2OUT_ED_NEXT_DROP;
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
+ new_addr0, old_addr0;
+ u16 old_port0, new_port0;
+ ip4_header_t *ip0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
+ snat_session_t *s0 = 0;
+ clib_bihash_kv_16_8_t kv0, value0;
+ ip_csum_t sum0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
+
+ if (is_output_feature)
+ iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
+
+ 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);
+ next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
+ rx_fib_index0,
+ thread_index, now, vm,
+ node);
+ if (!s0)
+ next0 = NAT_IN2OUT_ED_NEXT_DROP;
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out_ed_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+ goto trace0;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace0;
+ }
+
+ if (ip4_is_fragment (ip0))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_REASS;
+ goto trace0;
+ }
+
+ 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 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace0;
+ }
+ }
+
+ make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
+ ip0->protocol, rx_fib_index0, udp0->src_port,
+ udp0->dst_port);
+
+ if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
+ {
+ if (is_slow_path)
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate_output_feature
+ (sm, ip0, ip0->protocol, udp0->src_port,
+ udp0->dst_port, thread_index, sw_if_index0,
+ vnet_buffer (b0)->sw_if_index[VLIB_TX])))
+ goto trace0;
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
+ sw_if_index0,
+ ip0, proto0,
+ rx_fib_index0,
+ thread_index)))
+ goto trace0;
+ }
+
+ next0 =
+ slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
+ next0, thread_index, now);
+
+ if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
+ goto trace0;
+ }
+ else
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
+ goto trace0;
+ }
+ }
+ else
+ {
+ s0 = pool_elt_at_index (tsm->sessions, value0.value);
+ }
+
+ b0->flags |= VNET_BUFFER_F_IS_NATED;
+
+ if (!is_output_feature)
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+
+ old_addr0 = ip0->src_address.as_u32;
+ new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ src_address);
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32, ip4_header_t,
+ dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->src_port;
+ new_port0 = tcp0->src_port = s0->out2in.port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
+ length);
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, tcp0->dst_port,
+ s0->ext_host_port, ip4_header_t,
+ length);
+ tcp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ mss_clamping (sm, tcp0, &sum0);
+ tcp0->checksum = ip_csum_fold (sum0);
+ if (nat44_set_tcp_session_state_i2o
+ (sm, s0, tcp0, thread_index))
+ goto trace0;
+ }
+ else
+ {
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ udp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ }
+
+ /* Accounting */
+ nat44_session_update_counters (s0, now,
+ vlib_buffer_length_in_chain (vm,
+ b0));
+
+ 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->is_slow_path = is_slow_path;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (s0)
+ t->session_index = s0 - tsm->sessions;
+ }
+
+ pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, stats_node_index,
+ NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+static uword
+nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
+ .function = nat44_ed_in2out_fast_path_fn,
+ .name = "nat44-ed-in2out",
+ .vector_size = sizeof (u32),
+ .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),
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
+ nat44_ed_in2out_fast_path_fn);
+
+static uword
+nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
+ .function = nat44_ed_in2out_output_fast_path_fn,
+ .name = "nat44-ed-in2out-output",
+ .vector_size = sizeof (u32),
+ .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),
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
+ nat44_ed_in2out_output_fast_path_fn);
+
+static uword
+nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
+ .function = nat44_ed_in2out_slow_path_fn,
+ .name = "nat44-ed-in2out-slowpath",
+ .vector_size = sizeof (u32),
+ .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),
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
+ nat44_ed_in2out_slow_path_fn);
+
+static uword
+nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
+ .function = nat44_ed_in2out_output_slow_path_fn,
+ .name = "nat44-ed-in2out-output-slowpath",
+ .vector_size = sizeof (u32),
+ .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),
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
+ nat44_ed_in2out_output_slow_path_fn);
+
+static inline uword
+nat44_ed_in2out_reass_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, *to_next;
+ nat_in2out_ed_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+ f64 now = vlib_time_now (vm);
+ u32 thread_index = vm->thread_index;
+ snat_main_per_thread_data_t *per_thread_data =
+ &sm->per_thread_data[thread_index];
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
+ u32 iph_offset0 = 0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u8 cached0 = 0;
+ ip4_header_t *ip0 = 0;
+ nat_reass_ip4_t *reass0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
+ clib_bihash_kv_16_8_t kv0, value0;
+ snat_session_t *s0 = 0;
+ u16 old_port0, new_port0;
+ ip_csum_t sum0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
+
+ 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 (nat_reass_is_drop_frag (0)))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_DROP;
+ b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ if (is_output_feature)
+ iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
+
+ ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
+ iph_offset0);
+
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
+ ip0->dst_address,
+ ip0->fragment_id,
+ ip0->protocol,
+ 1, &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = NAT_IN2OUT_ED_NEXT_DROP;
+ b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
+ nat_log_notice ("maximum reassemblies exceeded");
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat_not_translate_output_feature_fwd
+ (sm, ip0, thread_index, now, vm, b0)))
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ goto trace0;
+ }
+
+ next0 = icmp_in2out_ed_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+
+ if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
+ {
+ if (s0)
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ else
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ nat_ip4_reass_get_frags (reass0,
+ &fragments_to_loopback);
+ }
+
+ goto trace0;
+ }
+
+ make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
+ ip0->protocol, rx_fib_index0, udp0->src_port,
+ udp0->dst_port);
+
+ if (clib_bihash_search_16_8
+ (&per_thread_data->in2out_ed, &kv0, &value0))
+ {
+ if (is_output_feature)
+ {
+ if (PREDICT_FALSE
+ (nat44_ed_not_translate_output_feature
+ (sm, ip0, ip0->protocol, udp0->src_port,
+ udp0->dst_port, thread_index, sw_if_index0,
+ vnet_buffer (b0)->sw_if_index[VLIB_TX])))
+ {
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ nat_ip4_reass_get_frags (reass0,
+ &fragments_to_loopback);
+ goto trace0;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
+ sw_if_index0,
+ ip0, proto0,
+ rx_fib_index0,
+ thread_index)))
+ {
+ reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
+ nat_ip4_reass_get_frags (reass0,
+ &fragments_to_loopback);
+ goto trace0;
+ }
+ }
+
+ next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
+ &s0, node, next0, thread_index, now);
+
+ if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
+ goto trace0;
+
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ value0.value);
+ reass0->sess_index = value0.value;
+ }
+ nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+ else
+ {
+ if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
+ goto trace0;
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
+ {
+ if (nat_ip4_reass_add_fragment
+ (reass0, bi0, &fragments_to_drop))
+ {
+ b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
+ nat_log_notice
+ ("maximum fragments per reassembly exceeded");
+ next0 = NAT_IN2OUT_ED_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ reass0->sess_index);
+ }
+
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address = s0->out2in.addr;
+ new_addr0 = ip0->src_address.as_u32;
+ if (!is_output_feature)
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ src_address /* changed member */ );
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32, ip4_header_t,
+ dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->src_port;
+ tcp0->src_port = s0->out2in.port;
+ new_port0 = tcp0->src_port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
+ s0->ext_host_addr.as_u32,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, tcp0->dst_port,
+ s0->ext_host_port, ip4_header_t,
+ length);
+ tcp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ old_port0 = udp0->src_port;
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ if (PREDICT_FALSE (is_twice_nat_session (s0)))
+ {
+ udp0->dst_port = s0->ext_host_port;
+ ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
+ }
+ }
+ }
+
+ /* Hairpinning */
+ if (PREDICT_TRUE (proto0 != SNAT_PROTOCOL_ICMP))
+ nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
+ s0->ext_host_port, proto0, 1);
+ else
+ snat_icmp_hairpinning (sm, b0, ip0, icmp0, 1);
+
+ /* Accounting */
+ nat44_session_update_counters (s0, now,
+ vlib_buffer_length_in_chain (vm,
+ b0));
+
+ trace0:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat44_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback,
+ sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len -
+ VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
+ NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
+ NAT_IN2OUT_ED_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+static uword
+nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
+ .function = nat44_ed_in2out_reass_node_fn,
+ .name = "nat44-ed-in2out-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat44_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
+ nat44_ed_in2out_reass_node_fn);
+
+static uword
+nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
+ .function = nat44_ed_in2out_reass_output_node_fn,
+ .name = "nat44-ed-in2out-reass-output",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat44_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
+ .error_strings = nat_in2out_ed_error_strings,
+ .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
+ .next_nodes = {
+ [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
+ [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
+ [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
+ nat44_ed_in2out_reass_output_node_fn);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */