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-rw-r--r--plugins/snat-plugin/snat/in2out.c953
1 files changed, 953 insertions, 0 deletions
diff --git a/plugins/snat-plugin/snat/in2out.c b/plugins/snat-plugin/snat/in2out.c
new file mode 100644
index 00000000000..3f7df910fe5
--- /dev/null
+++ b/plugins/snat-plugin/snat/in2out.c
@@ -0,0 +1,953 @@
+/*
+ * 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/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <snat/snat.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+vlib_node_registration_t snat_in2out_node, snat_in2out_slowpath_node;
+
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+ u32 is_slow_path;
+} snat_in2out_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 ? "SNAT_IN2OUT_SLOW_PATH" : "SNAT_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;
+}
+
+vlib_node_registration_t snat_in2out_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, "icmp type not echo-request")
+
+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_SLOW_PATH,
+ SNAT_IN2OUT_N_NEXT,
+} snat_in2out_next_t;
+
+
+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)
+{
+ 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;
+ u32 outside_fib_index;
+ uword * p;
+
+ 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];
+
+ 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->users, u);
+ memset (u, 0, sizeof (*u));
+ u->addr = ip0->src_address;
+
+ pool_get (sm->list_pool, per_user_list_head_elt);
+
+ u->sessions_per_user_list_head_index = per_user_list_head_elt -
+ sm->list_pool;
+
+ clib_dlist_init (sm->list_pool, u->sessions_per_user_list_head_index);
+
+ kv0.value = u - sm->users;
+
+ /* add user */
+ clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */);
+ }
+ else
+ {
+ u = pool_elt_at_index (sm->users, value0.value);
+ }
+
+ /* Over quota? Recycle the least recently used translation */
+ if (u->nsessions >= sm->max_translations_per_user)
+ {
+ /* Remove the oldest translation */
+ oldest_per_user_translation_list_index =
+ clib_dlist_remove_head
+ (sm->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->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->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->sessions, session_index);
+
+ /* 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");
+
+ 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, &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
+ {
+ if (snat_alloc_outside_address_and_port (sm, &key1, &address_index))
+ {
+ ASSERT(0);
+
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
+
+ /* Create a new session */
+ pool_get (sm->sessions, s);
+ memset (s, 0, sizeof (*s));
+
+ s->outside_address_index = address_index;
+
+ /* Create list elts */
+ pool_get (sm->list_pool, per_user_translation_list_elt);
+ clib_dlist_init (sm->list_pool, per_user_translation_list_elt -
+ sm->list_pool);
+
+ per_user_translation_list_elt->value = s - sm->sessions;
+ s->per_user_index = per_user_translation_list_elt - sm->list_pool;
+ s->per_user_list_head_index = u->sessions_per_user_list_head_index;
+
+ clib_dlist_addtail (sm->list_pool, s->per_user_list_head_index,
+ per_user_translation_list_elt - sm->list_pool);
+ u->nsessions++;
+ }
+
+ s->in2out = *key0;
+ s->out2in = key1;
+ s->out2in.protocol = key0->protocol;
+ s->out2in.fib_index = outside_fib_index;
+ *sessionp = s;
+
+ /* Add to translation hashes */
+ kv0.key = s->in2out.as_u64;
+ kv0.value = s - sm->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->sessions;
+
+ if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */))
+ clib_warning ("out2in key add failed");
+
+ return next0;
+}
+
+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)
+{
+ snat_session_key_t key0;
+ icmp_echo_header_t *echo0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_session_t * s0;
+ u32 new_addr0, old_addr0;
+ u16 old_id0, new_id0;
+ ip_csum_t sum0;
+ snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
+
+ if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ return SNAT_IN2OUT_NEXT_DROP;
+ }
+
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ key0.addr = ip0->src_address;
+ key0.port = echo0->identifier;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ return next0;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0);
+
+ if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
+ return next0;
+ }
+ else
+ s0 = pool_elt_at_index (sm->sessions, value0.value);
+
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address = s0->out2in.addr;
+ new_addr0 = ip0->src_address.as_u32;
+ 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);
+
+ old_id0 = echo0->identifier;
+ new_id0 = s0->out2in.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);
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_index);
+
+ return next0;
+}
+
+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)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
+ f64 now = vlib_time_now (vm);
+ u32 stats_node_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;
+
+ /* 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);
+
+ 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 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+ next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
+
+#if 0
+ /* Formally correct, but we send to slowpath, lookup or drop */
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+#endif
+
+ proto0 = ~0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto0;
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ 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);
+ 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)
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ goto trace00;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0);
+ 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->sessions, value0.value);
+
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address = s0->out2in.addr;
+ new_addr0 = ip0->src_address.as_u32;
+ 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->ports.src;
+ tcp0->ports.src = s0->out2in.port;
+ new_port0 = tcp0->ports.src;
+
+ 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;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->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->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ ip1 = vlib_buffer_get_current (b1);
+ 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 0
+ vnet_get_config_data (&cm->config_main,
+ &b1->current_config_index,
+ &next1,
+ 0 /* sizeof config data */);
+#endif
+
+ proto1 = ~0;
+ proto1 = (ip1->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto1;
+ proto1 = (ip1->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto1;
+ proto1 = (ip1->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto1;
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto1 == ~0))
+ 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);
+ 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)
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index1))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index1,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index1;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip1->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ goto trace01;
+
+ next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
+ &s1, node, next1);
+ 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->sessions, value1.value);
+
+ old_addr1 = ip1->src_address.as_u32;
+ ip1->src_address = s1->out2in.addr;
+ new_addr1 = ip1->src_address.as_u32;
+ 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->ports.src;
+ tcp1->ports.src = s1->out2in.port;
+ new_port1 = tcp1->ports.src;
+
+ 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;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s1->last_heard = now;
+ s1->total_pkts++;
+ s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
+ clib_dlist_remove (sm->list_pool, s1->per_user_index);
+ clib_dlist_addtail (sm->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->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;
+
+ /* 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 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+
+#if 0
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+#endif
+
+ proto0 = ~0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto0;
+
+ /* Next configured feature, probably ip4-lookup */
+ if (is_slow_path)
+ {
+ if (PREDICT_FALSE (proto0 == ~0))
+ 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);
+ 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)
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ goto trace0;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0);
+ 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->sessions, value0.value);
+
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address = s0->out2in.addr;
+ new_addr0 = ip0->src_address.as_u32;
+ 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->ports.src;
+ tcp0->ports.src = s0->out2in.port;
+ new_port0 = tcp0->ports.src;
+
+ 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;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->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->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 */);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_node) = {
+ .function = snat_in2out_fast_path_fn,
+ .name = "snat-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] = "snat-in2out-slowpath",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_node, snat_in2out_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 */);
+}
+
+VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
+ .function = snat_in2out_slow_path_fn,
+ .name = "snat-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] = "snat-in2out-slowpath",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node, snat_in2out_slow_path_fn);