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authorMatus Fabian <matfabia@cisco.com>2017-08-21 07:05:03 -0700
committerOle Trøan <otroan@employees.org>2017-08-23 07:42:10 +0000
commit2ba92e32e0197f676dd905e5edcb4ff3e1bec241 (patch)
tree4d5eba20eda422bde4e9218834e1b8662a43b001 /src/plugins/nat/in2out.c
parentcfc997ef3da9f406afe5caad99fc98a53aab7a77 (diff)
NAT: Rename snat plugin to nat (VPP-955)
Change-Id: I30a7e3da7a4efc6038a91e27b48045d4b07e2764 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/in2out.c')
-rw-r--r--src/plugins/nat/in2out.c3454
1 files changed, 3454 insertions, 0 deletions
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
new file mode 100644
index 00000000000..62a11170ef3
--- /dev/null
+++ b/src/plugins/nat/in2out.c
@@ -0,0 +1,3454 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/handoff.h>
+
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/fib/ip4_fib.h>
+#include <nat/nat.h>
+#include <nat/nat_ipfix_logging.h>
+#include <nat/nat_det.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+ u32 is_slow_path;
+} snat_in2out_trace_t;
+
+typedef struct {
+ u32 next_worker_index;
+ u8 do_handoff;
+} snat_in2out_worker_handoff_trace_t;
+
+/* packet trace format function */
+static u8 * format_snat_in2out_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ snat_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *);
+ char * tag;
+
+ tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_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 u8 * format_snat_in2out_fast_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ snat_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *);
+
+ s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
+ t->sw_if_index, t->next_index);
+
+ return s;
+}
+
+static u8 * format_snat_in2out_worker_handoff_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ snat_in2out_worker_handoff_trace_t * t =
+ va_arg (*args, snat_in2out_worker_handoff_trace_t *);
+ char * m;
+
+ m = t->do_handoff ? "next worker" : "same worker";
+ s = format (s, "NAT44_IN2OUT_WORKER_HANDOFF: %s %d", m, t->next_worker_index);
+
+ return s;
+}
+
+vlib_node_registration_t snat_in2out_node;
+vlib_node_registration_t snat_in2out_slowpath_node;
+vlib_node_registration_t snat_in2out_fast_node;
+vlib_node_registration_t snat_in2out_worker_handoff_node;
+vlib_node_registration_t snat_det_in2out_node;
+vlib_node_registration_t snat_in2out_output_node;
+vlib_node_registration_t snat_in2out_output_slowpath_node;
+vlib_node_registration_t snat_in2out_output_worker_handoff_node;
+vlib_node_registration_t snat_hairpin_dst_node;
+vlib_node_registration_t snat_hairpin_src_node;
+
+
+#define foreach_snat_in2out_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(IN2OUT_PACKETS, "Good in2out packets processed") \
+_(OUT_OF_PORTS, "Out of ports") \
+_(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \
+_(BAD_ICMP_TYPE, "unsupported ICMP type") \
+_(NO_TRANSLATION, "No translation")
+
+typedef enum {
+#define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
+ foreach_snat_in2out_error
+#undef _
+ SNAT_IN2OUT_N_ERROR,
+} snat_in2out_error_t;
+
+static char * snat_in2out_error_strings[] = {
+#define _(sym,string) string,
+ foreach_snat_in2out_error
+#undef _
+};
+
+typedef enum {
+ SNAT_IN2OUT_NEXT_LOOKUP,
+ SNAT_IN2OUT_NEXT_DROP,
+ SNAT_IN2OUT_NEXT_ICMP_ERROR,
+ SNAT_IN2OUT_NEXT_SLOW_PATH,
+ SNAT_IN2OUT_N_NEXT,
+} snat_in2out_next_t;
+
+typedef enum {
+ SNAT_HAIRPIN_SRC_NEXT_DROP,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH,
+ SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT,
+ SNAT_HAIRPIN_SRC_N_NEXT,
+} snat_hairpin_next_t;
+
+/**
+ * @brief Check if packet should be translated
+ *
+ * Packets aimed at outside interface and external addresss 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;
+ 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)
+ {
+ fei = fib_table_lookup (sm->outside_fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ sw_if_index = fib_entry_get_resolving_interface (fei);
+ }
+ snat_interface_t *i;
+ pool_foreach (i, sm->interfaces,
+ ({
+ /* NAT packet aimed at outside interface */
+ if ((i->is_inside == 0) && (sw_if_index == i->sw_if_index))
+ return 0;
+ }));
+ }
+
+ return 1;
+}
+
+static inline int
+snat_not_translate (snat_main_t * sm, vlib_node_runtime_t *node,
+ u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
+ u32 rx_fib_index0)
+{
+ udp_header_t * udp0 = ip4_next_header (ip0);
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* NAT packet aimed at external address if */
+ /* has active sessions */
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ /* or is static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ return 0;
+ }
+ else
+ return 0;
+
+ return snat_not_translate_fast(sm, node, sw_if_index0, ip0, proto0,
+ rx_fib_index0);
+}
+
+static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
+ ip4_header_t * ip0,
+ u32 rx_fib_index0,
+ snat_session_key_t * key0,
+ snat_session_t ** sessionp,
+ vlib_node_runtime_t * node,
+ u32 next0,
+ u32 thread_index)
+{
+ snat_user_t *u;
+ snat_user_key_t user_key;
+ snat_session_t *s;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u32 oldest_per_user_translation_list_index;
+ dlist_elt_t * oldest_per_user_translation_list_elt;
+ dlist_elt_t * per_user_translation_list_elt;
+ dlist_elt_t * per_user_list_head_elt;
+ u32 session_index;
+ snat_session_key_t key1;
+ u32 address_index = ~0;
+ u32 outside_fib_index;
+ uword * p;
+ snat_worker_key_t worker_by_out_key;
+
+ p = hash_get (sm->ip4_main->fib_index_by_table_id, sm->outside_vrf_id);
+ if (! p)
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_OUTSIDE_FIB];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
+ outside_fib_index = p[0];
+
+ key1.protocol = key0->protocol;
+ user_key.addr = ip0->src_address;
+ user_key.fib_index = rx_fib_index0;
+ kv0.key = user_key.as_u64;
+
+ /* Ever heard of the "user" = src ip4 address before? */
+ if (clib_bihash_search_8_8 (&sm->user_hash, &kv0, &value0))
+ {
+ /* no, make a new one */
+ pool_get (sm->per_thread_data[thread_index].users, u);
+ memset (u, 0, sizeof (*u));
+ u->addr = ip0->src_address;
+ u->fib_index = rx_fib_index0;
+
+ pool_get (sm->per_thread_data[thread_index].list_pool, per_user_list_head_elt);
+
+ u->sessions_per_user_list_head_index = per_user_list_head_elt -
+ sm->per_thread_data[thread_index].list_pool;
+
+ clib_dlist_init (sm->per_thread_data[thread_index].list_pool,
+ u->sessions_per_user_list_head_index);
+
+ kv0.value = u - sm->per_thread_data[thread_index].users;
+
+ /* add user */
+ clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */);
+ }
+ else
+ {
+ u = pool_elt_at_index (sm->per_thread_data[thread_index].users,
+ value0.value);
+ }
+
+ /* Over quota? Recycle the least recently used dynamic translation */
+ if (u->nsessions >= sm->max_translations_per_user)
+ {
+ /* Remove the oldest dynamic translation */
+ do {
+ oldest_per_user_translation_list_index =
+ clib_dlist_remove_head (sm->per_thread_data[thread_index].list_pool,
+ u->sessions_per_user_list_head_index);
+
+ ASSERT (oldest_per_user_translation_list_index != ~0);
+
+ /* add it back to the end of the LRU list */
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ u->sessions_per_user_list_head_index,
+ oldest_per_user_translation_list_index);
+ /* Get the list element */
+ oldest_per_user_translation_list_elt =
+ pool_elt_at_index (sm->per_thread_data[thread_index].list_pool,
+ oldest_per_user_translation_list_index);
+
+ /* Get the session index from the list element */
+ session_index = oldest_per_user_translation_list_elt->value;
+
+ /* Get the session */
+ s = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ session_index);
+ } while (snat_is_session_static (s));
+
+ if (snat_is_unk_proto_session (s))
+ {
+ clib_bihash_kv_16_8_t up_kv;
+ snat_unk_proto_ses_key_t key;
+
+ /* Remove from lookup tables */
+ key.l_addr = s->in2out.addr;
+ key.r_addr = s->ext_host_addr;
+ key.fib_index = s->in2out.fib_index;
+ key.proto = s->in2out.port;
+ up_kv.key[0] = key.as_u64[0];
+ up_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto, &up_kv, 0))
+ clib_warning ("in2out key del failed");
+
+ key.l_addr = s->out2in.addr;
+ key.fib_index = s->out2in.fib_index;
+ up_kv.key[0] = key.as_u64[0];
+ up_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto, &up_kv, 0))
+ clib_warning ("out2in key del failed");
+ }
+ else
+ {
+ /* Remove in2out, out2in keys */
+ kv0.key = s->in2out.as_u64;
+ if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 0 /* is_add */))
+ clib_warning ("in2out key delete failed");
+ kv0.key = s->out2in.as_u64;
+ if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 0 /* is_add */))
+ clib_warning ("out2in key delete failed");
+
+ /* log NAT event */
+ 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);
+
+ snat_free_outside_address_and_port
+ (sm, &s->out2in, s->outside_address_index);
+ }
+ s->outside_address_index = ~0;
+
+ if (snat_alloc_outside_address_and_port (sm, rx_fib_index0, thread_index,
+ &key1, &address_index))
+ {
+ ASSERT(0);
+
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
+ s->outside_address_index = address_index;
+ }
+ else
+ {
+ u8 static_mapping = 1;
+
+ /* First try to match static mapping by local address and port */
+ if (snat_static_mapping_match (sm, *key0, &key1, 0, 0))
+ {
+ static_mapping = 0;
+ /* Try to create dynamic translation */
+ if (snat_alloc_outside_address_and_port (sm, rx_fib_index0,
+ thread_index, &key1,
+ &address_index))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
+ }
+
+ /* Create a new session */
+ pool_get (sm->per_thread_data[thread_index].sessions, s);
+ memset (s, 0, sizeof (*s));
+
+ s->outside_address_index = address_index;
+
+ if (static_mapping)
+ {
+ u->nstaticsessions++;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ }
+ else
+ {
+ u->nsessions++;
+ }
+
+ /* Create list elts */
+ pool_get (sm->per_thread_data[thread_index].list_pool,
+ per_user_translation_list_elt);
+ clib_dlist_init (sm->per_thread_data[thread_index].list_pool,
+ per_user_translation_list_elt -
+ sm->per_thread_data[thread_index].list_pool);
+
+ per_user_translation_list_elt->value =
+ s - sm->per_thread_data[thread_index].sessions;
+ s->per_user_index = per_user_translation_list_elt -
+ sm->per_thread_data[thread_index].list_pool;
+ s->per_user_list_head_index = u->sessions_per_user_list_head_index;
+
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s->per_user_list_head_index,
+ per_user_translation_list_elt -
+ sm->per_thread_data[thread_index].list_pool);
+ }
+
+ s->in2out = *key0;
+ s->out2in = key1;
+ s->out2in.protocol = key0->protocol;
+ s->out2in.fib_index = outside_fib_index;
+ s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
+ *sessionp = s;
+
+ /* Add to translation hashes */
+ kv0.key = s->in2out.as_u64;
+ kv0.value = s - sm->per_thread_data[thread_index].sessions;
+ if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 1 /* is_add */))
+ clib_warning ("in2out key add failed");
+
+ kv0.key = s->out2in.as_u64;
+ kv0.value = s - sm->per_thread_data[thread_index].sessions;
+
+ if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */))
+ clib_warning ("out2in key add failed");
+
+ /* Add to translated packets worker lookup */
+ worker_by_out_key.addr = s->out2in.addr;
+ worker_by_out_key.port = s->out2in.port;
+ worker_by_out_key.fib_index = s->out2in.fib_index;
+ kv0.key = worker_by_out_key.as_u64;
+ kv0.value = thread_index;
+ clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv0, 1);
+
+ /* 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 next0;
+}
+
+static_always_inline
+snat_in2out_error_t icmp_get_key(ip4_header_t *ip0,
+ snat_session_key_t *p_key0)
+{
+ icmp46_header_t *icmp0;
+ snat_session_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.protocol = SNAT_PROTOCOL_ICMP;
+ key0.addr = ip0->src_address;
+ key0.port = echo0->identifier;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *)(echo0+1);
+ l4_header = ip4_next_header (inner_ip0);
+ key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
+ key0.addr = inner_ip0->dst_address;
+ switch (key0.protocol)
+ {
+ case SNAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t*)l4_header;
+ inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1);
+ key0.port = inner_echo0->identifier;
+ break;
+ case SNAT_PROTOCOL_UDP:
+ case SNAT_PROTOCOL_TCP:
+ key0.port = ((tcp_udp_header_t*)l4_header)->dst_port;
+ break;
+ default:
+ return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
+ }
+ }
+ *p_key0 = key0;
+ return -1; /* success */
+}
+
+/**
+ * Get address and port values to be used for ICMP packet translation
+ * and create session if needed
+ *
+ * @param[in,out] sm NAT main
+ * @param[in,out] node NAT node runtime
+ * @param[in] thread_index thread index
+ * @param[in,out] b0 buffer containing packet to be translated
+ * @param[out] p_proto protocol used for matching
+ * @param[out] p_value address and port after NAT translation
+ * @param[out] p_dont_translate if packet should not be translated
+ * @param d optional parameter
+ * @param e optional parameter
+ */
+u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node,
+ u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
+ snat_session_key_t *p_value,
+ u8 *p_dont_translate, void *d, void *e)
+{
+ ip4_header_t *ip0;
+ icmp46_header_t *icmp0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ snat_session_key_t key0;
+ snat_session_t *s0 = 0;
+ u8 dont_translate = 0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u32 next0 = ~0;
+ int err;
+ u32 iph_offset0 = 0;
+
+ if (PREDICT_FALSE(vnet_buffer(b0)->sw_if_index[VLIB_TX] != ~0))
+ {
+ iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
+ }
+ ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0);
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ err = icmp_get_key (ip0, &key0);
+ if (err != -1)
+ {
+ b0->error = node->errors[err];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
+ {
+ if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0) &&
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] == ~0))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+
+ if (PREDICT_FALSE(icmp_is_error_message (icmp0)))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0, thread_index);
+
+ if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
+ goto out;
+ }
+ else
+ {
+ if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request &&
+ icmp0->type != ICMP4_echo_reply &&
+ !icmp_is_error_message (icmp0)))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value0.value);
+ }
+
+out:
+ *p_proto = key0.protocol;
+ if (s0)
+ *p_value = s0->out2in;
+ *p_dont_translate = dont_translate;
+ if (d)
+ *(snat_session_t**)d = s0;
+ return next0;
+}
+
+/**
+ * Get address and port values to be used for ICMP packet translation
+ *
+ * @param[in] sm NAT main
+ * @param[in,out] node NAT node runtime
+ * @param[in] thread_index thread index
+ * @param[in,out] b0 buffer containing packet to be translated
+ * @param[out] p_proto protocol used for matching
+ * @param[out] p_value address and port after NAT translation
+ * @param[out] p_dont_translate if packet should not be translated
+ * @param d optional parameter
+ * @param e optional parameter
+ */
+u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node,
+ u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
+ snat_session_key_t *p_value,
+ u8 *p_dont_translate, void *d, void *e)
+{
+ ip4_header_t *ip0;
+ icmp46_header_t *icmp0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ snat_session_key_t key0;
+ snat_session_key_t sm0;
+ u8 dont_translate = 0;
+ u8 is_addr_only;
+ u32 next0 = ~0;
+ int err;
+
+ ip0 = vlib_buffer_get_current (b0);
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ err = icmp_get_key (ip0, &key0);
+ if (err != -1)
+ {
+ b0->error = node->errors[err];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out2;
+ }
+ key0.fib_index = rx_fib_index0;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 0, &is_addr_only))
+ {
+ if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+
+ if (icmp_is_error_message (icmp0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request &&
+ (icmp0->type != ICMP4_echo_reply || !is_addr_only) &&
+ !icmp_is_error_message (icmp0)))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+out:
+ *p_value = sm0;
+out2:
+ *p_proto = key0.protocol;
+ *p_dont_translate = dont_translate;
+ return next0;
+}
+
+static inline u32 icmp_in2out (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,
+ u32 thread_index,
+ void *d,
+ void *e)
+{
+ snat_session_key_t sm0;
+ u8 protocol;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+ u8 dont_translate;
+ u32 new_addr0, old_addr0;
+ u16 old_id0, new_id0;
+ ip_csum_t sum0;
+ u16 checksum0;
+ u32 next0_tmp;
+
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ next0_tmp = sm->icmp_match_in2out_cb(sm, node, thread_index, b0,
+ &protocol, &sm0, &dont_translate, d, e);
+ if (next0_tmp != ~0)
+ next0 = next0_tmp;
+ if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
+ goto out;
+
+ sum0 = ip_incremental_checksum (0, icmp0,
+ ntohs(ip0->length) - ip4_header_bytes (ip0));
+ checksum0 = ~ip_csum_fold (sum0);
+ if (PREDICT_FALSE(checksum0 != 0 && checksum0 != 0xffff))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ old_addr0 = ip0->src_address.as_u32;
+ new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32;
+ if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ src_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ new_id0 = sm0.port;
+ if (PREDICT_FALSE(new_id0 != echo0->identifier))
+ {
+ old_id0 = echo0->identifier;
+ new_id0 = sm0.port;
+ echo0->identifier = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
+ identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *)(echo0+1);
+ l4_header = ip4_next_header (inner_ip0);
+
+ if (!ip4_header_checksum_is_valid (inner_ip0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ old_addr0 = inner_ip0->dst_address.as_u32;
+ inner_ip0->dst_address = sm0.addr;
+ new_addr0 = inner_ip0->dst_address.as_u32;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address /* changed member */);
+ icmp0->checksum = ip_csum_fold (sum0);
+
+ switch (protocol)
+ {
+ case SNAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t*)l4_header;
+ inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1);
+
+ old_id0 = inner_echo0->identifier;
+ new_id0 = sm0.port;
+ inner_echo0->identifier = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
+ identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ break;
+ case SNAT_PROTOCOL_UDP:
+ case SNAT_PROTOCOL_TCP:
+ old_id0 = ((tcp_udp_header_t*)l4_header)->dst_port;
+ new_id0 = sm0.port;
+ ((tcp_udp_header_t*)l4_header)->dst_port = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
+ dst_port);
+ icmp0->checksum = ip_csum_fold (sum0);
+ break;
+ default:
+ ASSERT(0);
+ }
+ }
+
+out:
+ return next0;
+}
+
+/**
+ * @brief Hairpinning
+ *
+ * Hairpinning allows two endpoints on the internal side of the NAT to
+ * communicate even if they only use each other's external IP addresses
+ * and ports.
+ *
+ * @param sm NAT main.
+ * @param b0 Vlib buffer.
+ * @param ip0 IP header.
+ * @param udp0 UDP header.
+ * @param tcp0 TCP header.
+ * @param proto0 NAT protocol.
+ */
+static inline void
+snat_hairpinning (snat_main_t *sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ udp_header_t * udp0,
+ tcp_header_t * tcp0,
+ u32 proto0)
+{
+ snat_session_key_t key0, sm0;
+ snat_worker_key_t k0;
+ snat_session_t * s0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ ip_csum_t sum0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
+ u16 new_dst_port0, old_dst_port0;
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* Check if destination is in active sessions */
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ /* or static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ new_dst_port0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ }
+ else
+ {
+ si = value0.value;
+ if (sm->num_workers > 1)
+ {
+ k0.addr = ip0->dst_address;
+ k0.port = udp0->dst_port;
+ k0.fib_index = sm->outside_fib_index;
+ kv0.key = k0.as_u64;
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
+ ASSERT(0);
+ else
+ ti = value0.value;
+ }
+ else
+ ti = sm->num_workers;
+
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ new_dst_port0 = s0->in2out.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ }
+
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ old_dst_port0 = tcp0->dst;
+ if (PREDICT_TRUE(new_dst_port0 != old_dst_port0))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0->dst = new_dst_port0;
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
+ ip4_header_t /* cheat */, length);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ udp0->dst_port = new_dst_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ }
+ }
+}
+
+static inline void
+snat_icmp_hairpinning (snat_main_t *sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ icmp46_header_t * icmp0)
+{
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_worker_key_t k0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, si, ti = 0;
+ ip_csum_t sum0;
+ snat_session_t *s0;
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1);
+ u16 icmp_id0 = echo0->identifier;
+ key0.addr = ip0->dst_address;
+ key0.port = icmp_id0;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* Check if destination is in active sessions */
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ /* or static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ }
+ else
+ {
+ si = value0.value;
+ if (sm->num_workers > 1)
+ {
+ k0.addr = ip0->dst_address;
+ k0.port = icmp_id0;
+ k0.fib_index = sm->outside_fib_index;
+ kv0.key = k0.as_u64;
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
+ ASSERT(0);
+ else
+ ti = value0.value;
+ }
+ else
+ ti = sm->num_workers;
+
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ echo0->identifier = s0->in2out.port;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
+ icmp_echo_header_t, identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+ }
+ }
+
+}
+
+static inline u32 icmp_in2out_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 != SNAT_IN2OUT_NEXT_DROP && s0))
+ {
+ /* Hairpinning */
+ if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == 0)
+ snat_icmp_hairpinning(sm, b0, ip0, icmp0);
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
+ /* Per-user LRU list maintenance for dynamic translations */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
+ }
+ return next0;
+}
+static inline void
+snat_hairpinning_unknown_proto (snat_main_t *sm,
+ vlib_buffer_t * b,
+ ip4_header_t * ip)
+{
+ u32 old_addr, new_addr = 0, ti = 0;
+ clib_bihash_kv_8_8_t kv, value;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ snat_unk_proto_ses_key_t key;
+ snat_session_key_t m_key;
+ snat_worker_key_t w_key;
+ snat_static_mapping_t *m;
+ ip_csum_t sum;
+ snat_session_t *s;
+
+ old_addr = ip->dst_address.as_u32;
+ key.l_addr.as_u32 = ip->dst_address.as_u32;
+ key.r_addr.as_u32 = ip->src_address.as_u32;
+ key.fib_index = sm->outside_fib_index;
+ key.proto = ip->protocol;
+ key.rsvd[0] = key.rsvd[1] = key.rsvd[2] = 0;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
+ {
+ m_key.addr = ip->dst_address;
+ m_key.fib_index = sm->outside_fib_index;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return;
+
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = m->fib_index;
+ new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
+ }
+ else
+ {
+ if (sm->num_workers > 1)
+ {
+ w_key.addr = ip->dst_address;
+ w_key.port = 0;
+ w_key.fib_index = sm->outside_fib_index;
+ kv.key = w_key.as_u64;
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv, &value))
+ return;
+ else
+ ti = value.value;
+ }
+ else
+ ti = sm->num_workers;
+
+ s = pool_elt_at_index (sm->per_thread_data[ti].sessions, s_value.value);
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
+ new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
+ }
+ sum = ip->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ ip->checksum = ip_csum_fold (sum);
+}
+
+static void
+snat_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)
+{
+ clib_bihash_kv_8_8_t kv, value;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ snat_static_mapping_t *m;
+ snat_session_key_t m_key;
+ u32 old_addr, new_addr = 0;
+ ip_csum_t sum;
+ snat_user_key_t u_key;
+ snat_user_t *u;
+ dlist_elt_t *head, *elt, *oldest;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ u32 elt_index, head_index, ses_index, oldest_index;
+ snat_session_t * s;
+ snat_unk_proto_ses_key_t key;
+ u32 address_index = ~0;
+ int i;
+ u8 is_sm = 0;
+
+ old_addr = ip->src_address.as_u32;
+
+ key.l_addr = ip->src_address;
+ key.r_addr = ip->dst_address;
+ key.fib_index = rx_fib_index;
+ key.proto = ip->protocol;
+ key.rsvd[0] = key.rsvd[1] = key.rsvd[2] = 0;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+
+ if (!clib_bihash_search_16_8 (&sm->in2out_unk_proto, &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
+ {
+ u_key.addr = ip->src_address;
+ u_key.fib_index = rx_fib_index;
+ kv.key = u_key.as_u64;
+
+ /* Ever heard of the "user" = src ip4 address before? */
+ if (clib_bihash_search_8_8 (&sm->user_hash, &kv, &value))
+ {
+ /* no, make a new one */
+ pool_get (tsm->users, u);
+ memset (u, 0, sizeof (*u));
+ u->addr = ip->src_address;
+ u->fib_index = rx_fib_index;
+
+ pool_get (tsm->list_pool, head);
+ u->sessions_per_user_list_head_index = head - tsm->list_pool;
+
+ clib_dlist_init (tsm->list_pool,
+ u->sessions_per_user_list_head_index);
+
+ kv.value = u - tsm->users;
+
+ /* add user */
+ clib_bihash_add_del_8_8 (&sm->user_hash, &kv, 1);
+ }
+ else
+ {
+ u = pool_elt_at_index (tsm->users, value.value);
+ }
+
+ m_key.addr = ip->src_address;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ m_key.fib_index = rx_fib_index;
+ kv.key = m_key.as_u64;
+
+ /* 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 */
+ if (!clib_bihash_search_8_8 (&sm->user_hash, &kv, &value))
+ {
+ head_index = u->sessions_per_user_list_head_index;
+ head = pool_elt_at_index (tsm->list_pool, head_index);
+ elt_index = head->next;
+ 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;
+ address_index = s->outside_address_index;
+
+ key.fib_index = sm->outside_fib_index;
+ key.l_addr.as_u32 = new_addr;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
+ break;
+
+ goto create_ses;
+ }
+ }
+ }
+ key.fib_index = sm->outside_fib_index;
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ key.l_addr.as_u32 = sm->addresses[i].addr.as_u32;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
+ {
+ new_addr = ip->src_address.as_u32 = key.l_addr.as_u32;
+ address_index = i;
+ goto create_ses;
+ }
+ }
+ return;
+ }
+
+create_ses:
+ /* Over quota? Recycle the least recently used dynamic translation */
+ if (u->nsessions >= sm->max_translations_per_user && !is_sm)
+ {
+ /* Remove the oldest dynamic translation */
+ do {
+ oldest_index = clib_dlist_remove_head (
+ tsm->list_pool, u->sessions_per_user_list_head_index);
+
+ ASSERT (oldest_index != ~0);
+
+ /* add it back to the end of the LRU list */
+ clib_dlist_addtail (tsm->list_pool,
+ u->sessions_per_user_list_head_index,
+ oldest_index);
+ /* Get the list element */
+ oldest = pool_elt_at_index (tsm->list_pool, oldest_index);
+
+ /* Get the session index from the list element */
+ ses_index = oldest->value;
+
+ /* Get the session */
+ s = pool_elt_at_index (tsm->sessions, ses_index);
+ } while (snat_is_session_static (s));
+
+ if (snat_is_unk_proto_session (s))
+ {
+ /* Remove from lookup tables */
+ key.l_addr = s->in2out.addr;
+ key.r_addr = s->ext_host_addr;
+ key.fib_index = s->in2out.fib_index;
+ key.proto = s->in2out.port;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto, &s_kv, 0))
+ clib_warning ("in2out key del failed");
+
+ key.l_addr = s->out2in.addr;
+ key.fib_index = s->out2in.fib_index;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto, &s_kv, 0))
+ clib_warning ("out2in key del failed");
+ }
+ else
+ {
+ /* log NAT event */
+ 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);
+
+ snat_free_outside_address_and_port (sm, &s->out2in,
+ s->outside_address_index);
+
+ /* Remove in2out, out2in keys */
+ kv.key = s->in2out.as_u64;
+ if (clib_bihash_add_del_8_8 (&sm->in2out, &kv, 0))
+ clib_warning ("in2out key del failed");
+ kv.key = s->out2in.as_u64;
+ if (clib_bihash_add_del_8_8 (&sm->out2in, &kv, 0))
+ clib_warning ("out2in key del failed");
+ }
+ }
+ else
+ {
+ /* Create a new session */
+ pool_get (tsm->sessions, s);
+ memset (s, 0, sizeof (*s));
+
+ /* Create list elts */
+ pool_get (tsm->list_pool, elt);
+ clib_dlist_init (tsm->list_pool, elt - tsm->list_pool);
+ elt->value = s - tsm->sessions;
+ s->per_user_index = elt - tsm->list_pool;
+ s->per_user_list_head_index = u->sessions_per_user_list_head_index;
+ clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index,
+ s->per_user_index);
+ }
+
+ s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
+ s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
+ s->outside_address_index = address_index;
+ s->out2in.addr.as_u32 = new_addr;
+ s->out2in.fib_index = sm->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)
+ {
+ u->nstaticsessions++;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ }
+ else
+ {
+ u->nsessions++;
+ }
+
+ /* Add to lookup tables */
+ key.l_addr.as_u32 = old_addr;
+ key.r_addr = ip->dst_address;
+ key.proto = ip->protocol;
+ key.fib_index = rx_fib_index;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ s_kv.value = s - tsm->sessions;
+ if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto, &s_kv, 1))
+ clib_warning ("in2out key add failed");
+
+ key.l_addr.as_u32 = new_addr;
+ key.fib_index = sm->outside_fib_index;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto, &s_kv, 1))
+ clib_warning ("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 */
+ s->last_heard = now;
+ s->total_pkts++;
+ s->total_bytes += vlib_buffer_length_in_chain (vm, b);
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (tsm->list_pool, s->per_user_index);
+ clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index,
+ s->per_user_index);
+
+ /* Hairpinning */
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ snat_hairpinning_unknown_proto(sm, b, ip);
+
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
+}
+
+static inline uword
+snat_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;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ f64 now = vlib_time_now (vm);
+ u32 stats_node_index;
+ u32 thread_index = vlib_get_thread_index ();
+
+ stats_node_index = is_slow_path ? snat_in2out_slowpath_node.index :
+ snat_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, next1;
+ u32 sw_if_index0, sw_if_index1;
+ ip4_header_t * ip0, * ip1;
+ ip_csum_t sum0, sum1;
+ u32 new_addr0, old_addr0, new_addr1, old_addr1;
+ u16 old_port0, new_port0, old_port1, new_port1;
+ udp_header_t * udp0, * udp1;
+ tcp_header_t * tcp0, * tcp1;
+ icmp46_header_t * icmp0, * icmp1;
+ snat_session_key_t key0, key1;
+ u32 rx_fib_index0, rx_fib_index1;
+ u32 proto0, proto1;
+ snat_session_t * s0 = 0, * s1 = 0;
+ clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
+ u32 iph_offset0 = 0, iph_offset1 = 0;
+
+ /* 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);
+
+ 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;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+ next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ snat_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0,
+ thread_index, now, vm);
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out_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 || proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace00;
+ }
+ }
+
+ key0.addr = ip0->src_address;
+ key0.port = udp0->src_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (PREDICT_FALSE (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0) != 0))
+ {
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0,
+ ip0, proto0, rx_fib_index0)) && !is_output_feature)
+ goto trace00;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0, thread_index);
+ if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
+ goto trace00;
+ }
+ else
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace00;
+ }
+ }
+ else
+ s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value0.value);
+
+ 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 */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ 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 */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->src_port;
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ }
+
+ /* Hairpinning */
+ if (!is_output_feature)
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
+ trace00:
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_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 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ 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);
+
+ udp1 = ip4_next_header (ip1);
+ tcp1 = (tcp_header_t *) udp1;
+ icmp1 = (icmp46_header_t *) udp1;
+
+ sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
+ rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index1);
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace01;
+ }
+
+ proto1 = ip_proto_to_snat_proto (ip1->protocol);
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto1 == ~0))
+ {
+ snat_in2out_unknown_proto (sm, b1, ip1, rx_fib_index1,
+ thread_index, now, vm);
+ goto trace01;
+ }
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = icmp_in2out_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 || proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace01;
+ }
+ }
+
+ key1.addr = ip1->src_address;
+ key1.port = udp1->src_port;
+ key1.protocol = proto1;
+ key1.fib_index = rx_fib_index1;
+
+ kv1.key = key1.as_u64;
+
+ if (PREDICT_FALSE(clib_bihash_search_8_8 (&sm->in2out, &kv1, &value1) != 0))
+ {
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index1,
+ ip1, proto1, rx_fib_index1)) && !is_output_feature)
+ goto trace01;
+
+ next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
+ &s1, node, next1, thread_index);
+ if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
+ goto trace01;
+ }
+ else
+ {
+ next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace01;
+ }
+ }
+ else
+ s1 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value1.value);
+
+ old_addr1 = ip1->src_address.as_u32;
+ ip1->src_address = s1->out2in.addr;
+ new_addr1 = ip1->src_address.as_u32;
+ if (!is_output_feature)
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
+
+ sum1 = ip1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP))
+ {
+ old_port1 = tcp1->src_port;
+ tcp1->src_port = s1->out2in.port;
+ new_port1 = tcp1->src_port;
+
+ sum1 = tcp1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum1 = ip_csum_update (sum1, old_port1, new_port1,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp1->checksum = ip_csum_fold(sum1);
+ }
+ else
+ {
+ old_port1 = udp1->src_port;
+ udp1->src_port = s1->out2in.port;
+ udp1->checksum = 0;
+ }
+
+ /* Hairpinning */
+ if (!is_output_feature)
+ snat_hairpinning (sm, b1, ip1, udp1, tcp1, proto1);
+
+ /* Accounting */
+ s1->last_heard = now;
+ s1->total_pkts++;
+ s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s1))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s1->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s1->per_user_list_head_index,
+ s1->per_user_index);
+ }
+ trace01:
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ t->next_index = next1;
+ t->session_index = ~0;
+ if (s1)
+ t->session_index = s1 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ pkts_processed += next1 != SNAT_IN2OUT_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;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 old_port0, new_port0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ icmp46_header_t * icmp0;
+ snat_session_key_t key0;
+ u32 rx_fib_index0;
+ u32 proto0;
+ snat_session_t * s0 = 0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u32 iph_offset0 = 0;
+
+ /* 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 = SNAT_IN2OUT_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);
+
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ {
+ snat_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0,
+ thread_index, now, vm);
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out_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 || proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace0;
+ }
+ }
+
+ key0.addr = ip0->src_address;
+ key0.port = udp0->src_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
+ {
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0,
+ ip0, proto0, rx_fib_index0)) && !is_output_feature)
+ goto trace0;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0, thread_index);
+
+ if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
+ goto trace0;
+ }
+ else
+ {
+ next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
+ goto trace0;
+ }
+ }
+ else
+ s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value0.value);
+
+ 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 */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ 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 */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->src_port;
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ }
+
+ /* Hairpinning */
+ if (!is_output_feature)
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_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 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_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,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+static uword
+snat_in2out_fast_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */, 0);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_node) = {
+ .function = snat_in2out_fast_path_fn,
+ .name = "nat44-in2out",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_node, snat_in2out_fast_path_fn);
+
+static uword
+snat_in2out_output_fast_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */, 1);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_output_node) = {
+ .function = snat_in2out_output_fast_path_fn,
+ .name = "nat44-in2out-output",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_node,
+ snat_in2out_output_fast_path_fn);
+
+static uword
+snat_in2out_slow_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */, 0);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
+ .function = snat_in2out_slow_path_fn,
+ .name = "nat44-in2out-slowpath",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node,
+ snat_in2out_slow_path_fn);
+
+static uword
+snat_in2out_output_slow_path_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */, 1);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
+ .function = snat_in2out_output_slow_path_fn,
+ .name = "nat44-in2out-output-slowpath",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_slowpath_node,
+ snat_in2out_output_slow_path_fn);
+
+/**************************/
+/*** deterministic mode ***/
+/**************************/
+static uword
+snat_det_in2out_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ u32 now = (u32) vlib_time_now (vm);
+ u32 thread_index = vlib_get_thread_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, next1;
+ u32 sw_if_index0, sw_if_index1;
+ ip4_header_t * ip0, * ip1;
+ ip_csum_t sum0, sum1;
+ ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
+ u16 old_port0, new_port0, lo_port0, i0;
+ u16 old_port1, new_port1, lo_port1, i1;
+ udp_header_t * udp0, * udp1;
+ tcp_header_t * tcp0, * tcp1;
+ u32 proto0, proto1;
+ snat_det_out_key_t key0, key1;
+ snat_det_map_t * dm0, * dm1;
+ snat_det_session_t * ses0 = 0, * ses1 = 0;
+ u32 rx_fib_index0, rx_fib_index1;
+ icmp46_header_t * icmp0, * icmp1;
+
+ /* 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 = SNAT_IN2OUT_NEXT_LOOKUP;
+ next1 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
+ icmp0 = (icmp46_header_t *) udp0;
+
+ next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0, thread_index,
+ &ses0, &dm0);
+ goto trace0;
+ }
+
+ dm0 = snat_det_map_by_user(sm, &ip0->src_address);
+ if (PREDICT_FALSE(!dm0))
+ {
+ clib_warning("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+
+ snat_det_forward(dm0, &ip0->src_address, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = tcp0->dst;
+
+ ses0 = snat_det_find_ses_by_in(dm0, &ip0->src_address, tcp0->src, key0);
+ if (PREDICT_FALSE(!ses0))
+ {
+ for (i0 = 0; i0 < dm0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 + clib_net_to_host_u16 (tcp0->src)) % dm0->ports_per_host));
+
+ if (snat_det_get_ses_by_out (dm0, &ip0->src_address, key0.as_u64))
+ continue;
+
+ ses0 = snat_det_ses_create(dm0, &ip0->src_address, tcp0->src, &key0);
+ break;
+ }
+ if (PREDICT_FALSE(!ses0))
+ {
+ /* too many sessions for user, send ICMP error packet */
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+ }
+
+ new_port0 = ses0->out.out_port;
+
+ old_addr0.as_u32 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ if (tcp0->flags & TCP_FLAG_SYN)
+ ses0->state = SNAT_SESSION_TCP_SYN_SENT;
+ else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_SYN_SENT)
+ ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
+ else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
+ ses0->state = SNAT_SESSION_TCP_FIN_WAIT;
+ else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close(dm0, ses0);
+ else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT)
+ ses0->state = SNAT_SESSION_TCP_LAST_ACK;
+ else if (tcp0->flags == 0 && ses0->state == SNAT_SESSION_UNKNOWN)
+ ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
+
+ old_port0 = tcp0->src;
+ tcp0->src = new_port0;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ ses0->state = SNAT_SESSION_UDP_ACTIVE;
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0;
+ udp0->checksum = 0;
+ }
+
+ switch(ses0->state)
+ {
+ case SNAT_SESSION_UDP_ACTIVE:
+ ses0->expire = now + sm->udp_timeout;
+ break;
+ case SNAT_SESSION_TCP_SYN_SENT:
+ case SNAT_SESSION_TCP_FIN_WAIT:
+ case SNAT_SESSION_TCP_CLOSE_WAIT:
+ case SNAT_SESSION_TCP_LAST_ACK:
+ ses0->expire = now + sm->tcp_transitory_timeout;
+ break;
+ case SNAT_SESSION_TCP_ESTABLISHED:
+ ses0->expire = now + sm->tcp_established_timeout;
+ break;
+ }
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->is_slow_path = 0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (ses0)
+ t->session_index = ses0 - dm0->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ ip1 = vlib_buffer_get_current (b1);
+ udp1 = ip4_next_header (ip1);
+ tcp1 = (tcp_header_t *) udp1;
+
+ sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace1;
+ }
+
+ proto1 = ip_proto_to_snat_proto (ip1->protocol);
+
+ if (PREDICT_FALSE(proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index1 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index1);
+ icmp1 = (icmp46_header_t *) udp1;
+
+ next1 = icmp_in2out(sm, b1, ip1, icmp1, sw_if_index1,
+ rx_fib_index1, node, next1, thread_index,
+ &ses1, &dm1);
+ goto trace1;
+ }
+
+ dm1 = snat_det_map_by_user(sm, &ip1->src_address);
+ if (PREDICT_FALSE(!dm1))
+ {
+ clib_warning("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next1 = SNAT_IN2OUT_NEXT_DROP;
+ b1->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace1;
+ }
+
+ snat_det_forward(dm1, &ip1->src_address, &new_addr1, &lo_port1);
+
+ key1.ext_host_addr = ip1->dst_address;
+ key1.ext_host_port = tcp1->dst;
+
+ ses1 = snat_det_find_ses_by_in(dm1, &ip1->src_address, tcp1->src, key1);
+ if (PREDICT_FALSE(!ses1))
+ {
+ for (i1 = 0; i1 < dm1->ports_per_host; i1++)
+ {
+ key1.out_port = clib_host_to_net_u16 (lo_port1 +
+ ((i1 + clib_net_to_host_u16 (tcp1->src)) % dm1->ports_per_host));
+
+ if (snat_det_get_ses_by_out (dm1, &ip1->src_address, key1.as_u64))
+ continue;
+
+ ses1 = snat_det_ses_create(dm1, &ip1->src_address, tcp1->src, &key1);
+ break;
+ }
+ if (PREDICT_FALSE(!ses1))
+ {
+ /* too many sessions for user, send ICMP error packet */
+
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b1, ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace1;
+ }
+ }
+
+ new_port1 = ses1->out.out_port;
+
+ old_addr1.as_u32 = ip1->src_address.as_u32;
+ ip1->src_address.as_u32 = new_addr1.as_u32;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
+
+ sum1 = ip1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP))
+ {
+ if (tcp1->flags & TCP_FLAG_SYN)
+ ses1->state = SNAT_SESSION_TCP_SYN_SENT;
+ else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_SYN_SENT)
+ ses1->state = SNAT_SESSION_TCP_ESTABLISHED;
+ else if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_ESTABLISHED)
+ ses1->state = SNAT_SESSION_TCP_FIN_WAIT;
+ else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close(dm1, ses1);
+ else if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_CLOSE_WAIT)
+ ses1->state = SNAT_SESSION_TCP_LAST_ACK;
+ else if (tcp1->flags == 0 && ses1->state == SNAT_SESSION_UNKNOWN)
+ ses1->state = SNAT_SESSION_TCP_ESTABLISHED;
+
+ old_port1 = tcp1->src;
+ tcp1->src = new_port1;
+
+ sum1 = tcp1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum1 = ip_csum_update (sum1, old_port1, new_port1,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp1->checksum = ip_csum_fold(sum1);
+ }
+ else
+ {
+ ses1->state = SNAT_SESSION_UDP_ACTIVE;
+ old_port1 = udp1->src_port;
+ udp1->src_port = new_port1;
+ udp1->checksum = 0;
+ }
+
+ switch(ses1->state)
+ {
+ case SNAT_SESSION_UDP_ACTIVE:
+ ses1->expire = now + sm->udp_timeout;
+ break;
+ case SNAT_SESSION_TCP_SYN_SENT:
+ case SNAT_SESSION_TCP_FIN_WAIT:
+ case SNAT_SESSION_TCP_CLOSE_WAIT:
+ case SNAT_SESSION_TCP_LAST_ACK:
+ ses1->expire = now + sm->tcp_transitory_timeout;
+ break;
+ case SNAT_SESSION_TCP_ESTABLISHED:
+ ses1->expire = now + sm->tcp_established_timeout;
+ break;
+ }
+
+ trace1:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->is_slow_path = 0;
+ t->sw_if_index = sw_if_index1;
+ t->next_index = next1;
+ t->session_index = ~0;
+ if (ses1)
+ t->session_index = ses1 - dm1->sessions;
+ }
+
+ pkts_processed += next1 != SNAT_IN2OUT_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;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ ip4_address_t new_addr0, old_addr0;
+ u16 old_port0, new_port0, lo_port0, i0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ u32 proto0;
+ snat_det_out_key_t key0;
+ snat_det_map_t * dm0;
+ snat_det_session_t * ses0 = 0;
+ u32 rx_fib_index0;
+ icmp46_header_t * icmp0;
+
+ /* 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 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
+ icmp0 = (icmp46_header_t *) udp0;
+
+ next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0, thread_index,
+ &ses0, &dm0);
+ goto trace00;
+ }
+
+ dm0 = snat_det_map_by_user(sm, &ip0->src_address);
+ if (PREDICT_FALSE(!dm0))
+ {
+ clib_warning("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace00;
+ }
+
+ snat_det_forward(dm0, &ip0->src_address, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = tcp0->dst;
+
+ ses0 = snat_det_find_ses_by_in(dm0, &ip0->src_address, tcp0->src, key0);
+ if (PREDICT_FALSE(!ses0))
+ {
+ for (i0 = 0; i0 < dm0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 + clib_net_to_host_u16 (tcp0->src)) % dm0->ports_per_host));
+
+ if (snat_det_get_ses_by_out (dm0, &ip0->src_address, key0.as_u64))
+ continue;
+
+ ses0 = snat_det_ses_create(dm0, &ip0->src_address, tcp0->src, &key0);
+ break;
+ }
+ if (PREDICT_FALSE(!ses0))
+ {
+ /* too many sessions for user, send ICMP error packet */
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+ }
+
+ new_port0 = ses0->out.out_port;
+
+ old_addr0.as_u32 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ if (tcp0->flags & TCP_FLAG_SYN)
+ ses0->state = SNAT_SESSION_TCP_SYN_SENT;
+ else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_SYN_SENT)
+ ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
+ else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
+ ses0->state = SNAT_SESSION_TCP_FIN_WAIT;
+ else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close(dm0, ses0);
+ else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT)
+ ses0->state = SNAT_SESSION_TCP_LAST_ACK;
+ else if (tcp0->flags == 0 && ses0->state == SNAT_SESSION_UNKNOWN)
+ ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
+
+ old_port0 = tcp0->src;
+ tcp0->src = new_port0;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ ses0->state = SNAT_SESSION_UDP_ACTIVE;
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0;
+ udp0->checksum = 0;
+ }
+
+ switch(ses0->state)
+ {
+ case SNAT_SESSION_UDP_ACTIVE:
+ ses0->expire = now + sm->udp_timeout;
+ break;
+ case SNAT_SESSION_TCP_SYN_SENT:
+ case SNAT_SESSION_TCP_FIN_WAIT:
+ case SNAT_SESSION_TCP_CLOSE_WAIT:
+ case SNAT_SESSION_TCP_LAST_ACK:
+ ses0->expire = now + sm->tcp_transitory_timeout;
+ break;
+ case SNAT_SESSION_TCP_ESTABLISHED:
+ ses0->expire = now + sm->tcp_established_timeout;
+ break;
+ }
+
+ trace00:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->is_slow_path = 0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (ses0)
+ t->session_index = ses0 - dm0->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_det_in2out_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_det_in2out_node) = {
+ .function = snat_det_in2out_node_fn,
+ .name = "nat44-det-in2out",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = 3,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_det_in2out_node, snat_det_in2out_node_fn);
+
+/**
+ * Get address and port values to be used for ICMP packet translation
+ * and create session if needed
+ *
+ * @param[in,out] sm NAT main
+ * @param[in,out] node NAT node runtime
+ * @param[in] thread_index thread index
+ * @param[in,out] b0 buffer containing packet to be translated
+ * @param[out] p_proto protocol used for matching
+ * @param[out] p_value address and port after NAT translation
+ * @param[out] p_dont_translate if packet should not be translated
+ * @param d optional parameter
+ * @param e optional parameter
+ */
+u32 icmp_match_in2out_det(snat_main_t *sm, vlib_node_runtime_t *node,
+ u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
+ snat_session_key_t *p_value,
+ u8 *p_dont_translate, void *d, void *e)
+{
+ ip4_header_t *ip0;
+ icmp46_header_t *icmp0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ u8 protocol;
+ snat_det_out_key_t key0;
+ u8 dont_translate = 0;
+ u32 next0 = ~0;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+ snat_det_map_t * dm0 = 0;
+ ip4_address_t new_addr0;
+ u16 lo_port0, i0;
+ snat_det_session_t * ses0 = 0;
+ ip4_address_t in_addr;
+ u16 in_port;
+
+ ip0 = vlib_buffer_get_current (b0);
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ protocol = SNAT_PROTOCOL_ICMP;
+ in_addr = ip0->src_address;
+ in_port = echo0->identifier;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *)(echo0+1);
+ l4_header = ip4_next_header (inner_ip0);
+ protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
+ in_addr = inner_ip0->dst_address;
+ switch (protocol)
+ {
+ case SNAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t*)l4_header;
+ inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1);
+ in_port = inner_echo0->identifier;
+ break;
+ case SNAT_PROTOCOL_UDP:
+ case SNAT_PROTOCOL_TCP:
+ in_port = ((tcp_udp_header_t*)l4_header)->dst_port;
+ break;
+ default:
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ }
+
+ dm0 = snat_det_map_by_user(sm, &in_addr);
+ if (PREDICT_FALSE(!dm0))
+ {
+ clib_warning("no match for internal host %U",
+ format_ip4_address, &in_addr);
+ if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ goto out;
+ }
+
+ snat_det_forward(dm0, &in_addr, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = 0;
+
+ ses0 = snat_det_find_ses_by_in(dm0, &in_addr, in_port, key0);
+ if (PREDICT_FALSE(!ses0))
+ {
+ if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+ if (icmp0->type != ICMP4_echo_request)
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ for (i0 = 0; i0 < dm0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 + clib_net_to_host_u16 (echo0->identifier)) % dm0->ports_per_host));
+
+ if (snat_det_get_ses_by_out (dm0, &in_addr, key0.as_u64))
+ continue;
+
+ ses0 = snat_det_ses_create(dm0, &in_addr, echo0->identifier, &key0);
+ break;
+ }
+ if (PREDICT_FALSE(!ses0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
+ goto out;
+ }
+ }
+
+ if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request &&
+ !icmp_is_error_message (icmp0)))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ u32 now = (u32) vlib_time_now (sm->vlib_main);
+
+ ses0->state = SNAT_SESSION_ICMP_ACTIVE;
+ ses0->expire = now + sm->icmp_timeout;
+
+out:
+ *p_proto = protocol;
+ if (ses0)
+ {
+ p_value->addr = new_addr0;
+ p_value->fib_index = sm->outside_fib_index;
+ p_value->port = ses0->out.out_port;
+ }
+ *p_dont_translate = dont_translate;
+ if (d)
+ *(snat_det_session_t**)d = ses0;
+ if (e)
+ *(snat_det_map_t**)e = dm0;
+ return next0;
+}
+
+/**********************/
+/*** worker handoff ***/
+/**********************/
+static inline uword
+snat_in2out_worker_handoff_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ u8 is_output)
+{
+ snat_main_t *sm = &snat_main;
+ vlib_thread_main_t *tm = vlib_get_thread_main ();
+ u32 n_left_from, *from, *to_next = 0;
+ static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index;
+ static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index
+ = 0;
+ vlib_frame_queue_elt_t *hf = 0;
+ vlib_frame_t *f = 0;
+ int i;
+ u32 n_left_to_next_worker = 0, *to_next_worker = 0;
+ u32 next_worker_index = 0;
+ u32 current_worker_index = ~0;
+ u32 thread_index = vlib_get_thread_index ();
+ u32 fq_index;
+ u32 to_node_index;
+
+ ASSERT (vec_len (sm->workers));
+
+ if (is_output)
+ {
+ fq_index = sm->fq_in2out_output_index;
+ to_node_index = sm->in2out_output_node_index;
+ }
+ else
+ {
+ fq_index = sm->fq_in2out_index;
+ to_node_index = sm->in2out_node_index;
+ }
+
+ if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0))
+ {
+ vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
+
+ vec_validate_init_empty (congested_handoff_queue_by_worker_index,
+ sm->first_worker_index + sm->num_workers - 1,
+ (vlib_frame_queue_t *) (~0));
+ }
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ ip4_header_t * ip0;
+ u8 do_handoff;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ next_worker_index = sm->worker_in2out_cb(ip0, rx_fib_index0);
+
+ if (PREDICT_FALSE (next_worker_index != thread_index))
+ {
+ do_handoff = 1;
+
+ if (next_worker_index != current_worker_index)
+ {
+ if (hf)
+ hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
+
+ hf = vlib_get_worker_handoff_queue_elt (fq_index,
+ next_worker_index,
+ handoff_queue_elt_by_worker_index);
+
+ n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
+ to_next_worker = &hf->buffer_index[hf->n_vectors];
+ current_worker_index = next_worker_index;
+ }
+
+ /* enqueue to correct worker thread */
+ to_next_worker[0] = bi0;
+ to_next_worker++;
+ n_left_to_next_worker--;
+
+ if (n_left_to_next_worker == 0)
+ {
+ hf->n_vectors = VLIB_FRAME_SIZE;
+ vlib_put_frame_queue_elt (hf);
+ current_worker_index = ~0;
+ handoff_queue_elt_by_worker_index[next_worker_index] = 0;
+ hf = 0;
+ }
+ }
+ else
+ {
+ do_handoff = 0;
+ /* if this is 1st frame */
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, to_node_index);
+ to_next = vlib_frame_vector_args (f);
+ }
+
+ to_next[0] = bi0;
+ to_next += 1;
+ f->n_vectors++;
+ }
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_worker_handoff_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->next_worker_index = next_worker_index;
+ t->do_handoff = do_handoff;
+ }
+ }
+
+ if (f)
+ vlib_put_frame_to_node (vm, to_node_index, f);
+
+ if (hf)
+ hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
+
+ /* Ship frames to the worker nodes */
+ for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
+ {
+ if (handoff_queue_elt_by_worker_index[i])
+ {
+ hf = handoff_queue_elt_by_worker_index[i];
+ /*
+ * It works better to let the handoff node
+ * rate-adapt, always ship the handoff queue element.
+ */
+ if (1 || hf->n_vectors == hf->last_n_vectors)
+ {
+ vlib_put_frame_queue_elt (hf);
+ handoff_queue_elt_by_worker_index[i] = 0;
+ }
+ else
+ hf->last_n_vectors = hf->n_vectors;
+ }
+ congested_handoff_queue_by_worker_index[i] =
+ (vlib_frame_queue_t *) (~0);
+ }
+ hf = 0;
+ current_worker_index = ~0;
+ return frame->n_vectors;
+}
+
+static uword
+snat_in2out_worker_handoff_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_worker_handoff_fn_inline (vm, node, frame, 0);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_worker_handoff_node) = {
+ .function = snat_in2out_worker_handoff_fn,
+ .name = "nat44-in2out-worker-handoff",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_worker_handoff_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_worker_handoff_node,
+ snat_in2out_worker_handoff_fn);
+
+static uword
+snat_in2out_output_worker_handoff_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return snat_in2out_worker_handoff_fn_inline (vm, node, frame, 1);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_output_worker_handoff_node) = {
+ .function = snat_in2out_output_worker_handoff_fn,
+ .name = "nat44-in2out-output-worker-handoff",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_worker_handoff_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_worker_handoff_node,
+ snat_in2out_output_worker_handoff_fn);
+
+static_always_inline int
+is_hairpinning (snat_main_t *sm, ip4_address_t * dst_addr)
+{
+ snat_address_t * ap;
+ clib_bihash_kv_8_8_t kv, value;
+ snat_session_key_t m_key;
+
+ vec_foreach (ap, sm->addresses)
+ {
+ if (ap->addr.as_u32 == dst_addr->as_u32)
+ return 1;
+ }
+
+ m_key.addr.as_u32 = dst_addr->as_u32;
+ m_key.fib_index = sm->outside_fib_index;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ kv.key = m_key.as_u64;
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return 1;
+
+ return 0;
+}
+
+static uword
+snat_hairpin_dst_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0;
+ ip4_header_t * ip0;
+ u32 proto0;
+
+ /* 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 = SNAT_IN2OUT_NEXT_LOOKUP;
+ ip0 = vlib_buffer_get_current (b0);
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ vnet_buffer (b0)->snat.flags = 0;
+ if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address)))
+ {
+ if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
+ {
+ udp_header_t * udp0 = ip4_next_header (ip0);
+ tcp_header_t * tcp0 = (tcp_header_t *) udp0;
+
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+ }
+ else if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ icmp46_header_t * icmp0 = ip4_next_header (ip0);
+
+ snat_icmp_hairpinning (sm, b0, ip0, icmp0);
+ }
+ else
+ {
+ snat_hairpinning_unknown_proto (sm, b0, ip0);
+ }
+
+ vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING;
+ clib_warning("is hairpinning");
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_hairpin_dst_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_hairpin_dst_node) = {
+ .function = snat_hairpin_dst_fn,
+ .name = "nat44-hairpin-dst",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+ .n_next_nodes = 2,
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_dst_node,
+ snat_hairpin_dst_fn);
+
+static uword
+snat_hairpin_src_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0;
+
+ /* 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 = SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT;
+
+ if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) & SNAT_FLAG_HAIRPINNING))
+ {
+ if (PREDICT_TRUE (sm->num_workers > 1))
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH;
+ else
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_hairpin_src_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_hairpin_src_node) = {
+ .function = snat_hairpin_src_fn,
+ .name = "nat44-hairpin-src",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+ .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
+ .next_nodes = {
+ [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-in2out-output",
+ [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_src_node,
+ snat_hairpin_src_fn);
+
+static uword
+snat_in2out_fast_static_map_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ u32 stats_node_index;
+
+ stats_node_index = snat_in2out_fast_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 > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 old_port0, new_port0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ icmp46_header_t * icmp0;
+ snat_session_key_t key0, sm0;
+ u32 proto0;
+ u32 rx_fib_index0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ next0 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
+
+ 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace0;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0, ~0, 0, 0);
+ goto trace0;
+ }
+
+ key0.addr = ip0->src_address;
+ key0.port = udp0->src_port;
+ key0.fib_index = rx_fib_index0;
+
+ if (snat_static_mapping_match(sm, key0, &sm0, 0, 0))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
+ next0= SNAT_IN2OUT_NEXT_DROP;
+ goto trace0;
+ }
+
+ new_addr0 = sm0.addr.as_u32;
+ new_port0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE(new_port0 != udp0->dst_port))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->src_port;
+ tcp0->src_port = new_port0;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ }
+
+ /* Hairpinning */
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_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,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+
+VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
+ .function = snat_in2out_fast_static_map_fn,
+ .name = "nat44-in2out-fast",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_in2out_fast_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_fast_node, snat_in2out_fast_static_map_fn);