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-rw-r--r--plugins/snat-plugin/Makefile.am55
-rw-r--r--plugins/snat-plugin/configure.ac27
-rw-r--r--plugins/snat-plugin/snat/in2out.c953
-rw-r--r--plugins/snat-plugin/snat/out2in.c601
-rw-r--r--plugins/snat-plugin/snat/snat.api25
-rw-r--r--plugins/snat-plugin/snat/snat.c716
-rw-r--r--plugins/snat-plugin/snat/snat.h181
-rw-r--r--plugins/snat-plugin/snat/snat_all_api_h.h19
-rw-r--r--plugins/snat-plugin/snat/snat_msg_enum.h31
-rw-r--r--plugins/snat-plugin/snat/snat_test.c265
10 files changed, 2873 insertions, 0 deletions
diff --git a/plugins/snat-plugin/Makefile.am b/plugins/snat-plugin/Makefile.am
new file mode 100644
index 00000000000..11b0839a6c9
--- /dev/null
+++ b/plugins/snat-plugin/Makefile.am
@@ -0,0 +1,55 @@
+
+# Copyright (c) <current-year> <your-organization>
+# 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.
+
+AUTOMAKE_OPTIONS = foreign subdir-objects
+
+AM_CFLAGS = -Wall -I@TOOLKIT_INCLUDE@ @DPDK@
+
+lib_LTLIBRARIES = snat_plugin.la snat_test_plugin.la
+
+snat_plugin_la_SOURCES = snat/snat.c \
+ snat/in2out.c \
+ snat/out2in.c \
+ snat/snat_plugin.api.h
+
+snat_plugin_la_LDFLAGS = -module
+
+BUILT_SOURCES = snat/snat.api.h
+
+SUFFIXES = .api.h .api
+
+%.api.h: %.api
+ mkdir -p `dirname $@` ; \
+ $(CC) $(CPPFLAGS) -E -P -C -x c $^ \
+ | vppapigen --input - --output $@ --show-name $@
+
+nobase_include_HEADERS = \
+ snat/snat_all_api_h.h \
+ snat/snat_msg_enum.h \
+ snat/snat.api.h
+
+snat_test_plugin_la_SOURCES = \
+ snat/snat_test.c snat/snat_plugin.api.h
+snat_test_plugin_la_LDFLAGS = -module
+
+if WITH_PLUGIN_TOOLKIT
+install-data-hook:
+ mkdir /usr/lib/vpp_plugins || true
+ mkdir /usr/lib/vpp_api_test_plugins || true
+ cp -L $(prefix)/lib/snat_plugin.so /usr/lib/vpp_plugins
+ cp -L $(prefix)/lib/snat_test_plugin.so \
+ /usr/lib/vpp_api_test_plugins
+ rm -f $(prefix)/lib/snat_plugin.*
+ rm -f $(prefix)/lib/snat_test_plugin.*
+endif
diff --git a/plugins/snat-plugin/configure.ac b/plugins/snat-plugin/configure.ac
new file mode 100644
index 00000000000..e43437d2690
--- /dev/null
+++ b/plugins/snat-plugin/configure.ac
@@ -0,0 +1,27 @@
+
+AC_INIT(snat_plugin, 1.0)
+AM_INIT_AUTOMAKE
+
+AC_PROG_LIBTOOL
+AM_PROG_AS
+AC_PROG_CC
+AM_PROG_CC_C_O
+
+AC_ARG_WITH(dpdk,
+ AC_HELP_STRING([--with-dpdk],[Use the Intel dpdk]),
+ [with_dpdk=1],
+ [with_dpdk=0])
+
+AM_CONDITIONAL(WITH_DPDK, test "$with_dpdk" = "1")
+AC_SUBST(DPDK,["-DDPDK=${with_dpdk}"])
+
+AC_ARG_WITH(plugin-toolkit,
+ AC_HELP_STRING([--with-plugin-toolkit],
+ [build using the vpp toolkit]),
+ [with_plugin_toolkit=${prefix}/include],
+ [with_plugin_toolkit=.])
+
+AC_SUBST(TOOLKIT_INCLUDE,[${with_plugin_toolkit}])
+AM_CONDITIONAL(WITH_PLUGIN_TOOLKIT, test "$with_plugin_toolkit" != ".")
+
+AC_OUTPUT([Makefile])
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);
diff --git a/plugins/snat-plugin/snat/out2in.c b/plugins/snat-plugin/snat/out2in.c
new file mode 100644
index 00000000000..0fa96c97f83
--- /dev/null
+++ b/plugins/snat-plugin/snat/out2in.c
@@ -0,0 +1,601 @@
+/*
+ * 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_out2in_node;
+
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+} snat_out2in_trace_t;
+
+/* packet trace format function */
+static u8 * format_snat_out2in_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ snat_out2in_trace_t * t = va_arg (*args, snat_out2in_trace_t *);
+
+ s = format (s, "SNAT_OUT2IN: sw_if_index %d, next index %d, session index %d",
+ t->sw_if_index, t->next_index, t->session_index);
+ return s;
+}
+
+vlib_node_registration_t snat_out2in_node;
+
+#define foreach_snat_out2in_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(OUT2IN_PACKETS, "Good out2in packets processed") \
+_(BAD_ICMP_TYPE, "icmp type not echo-reply") \
+_(NO_TRANSLATION, "No translation")
+
+typedef enum {
+#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
+ foreach_snat_out2in_error
+#undef _
+ SNAT_OUT2IN_N_ERROR,
+} snat_out2in_error_t;
+
+static char * snat_out2in_error_strings[] = {
+#define _(sym,string) string,
+ foreach_snat_out2in_error
+#undef _
+};
+
+typedef enum {
+ SNAT_OUT2IN_NEXT_DROP,
+ SNAT_OUT2IN_N_NEXT,
+} snat_out2in_next_t;
+
+static inline u32 icmp_out2in_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;
+
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ key0.addr = ip0->dst_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->out2in, &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;
+
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ return SNAT_OUT2IN_NEXT_DROP;
+ }
+ else
+ s0 = pool_elt_at_index (sm->sessions, value0.value);
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_address.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ old_id0 = echo0->identifier;
+ new_id0 = s0->in2out.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 uword
+snat_out2in_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ ip_lookup_main_t * lm = sm->ip4_lookup_main;
+ ip_config_main_t * cm = &lm->rx_config_mains[VNET_UNICAST];
+ f64 now = vlib_time_now (vm);
+
+ 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 = SNAT_OUT2IN_NEXT_DROP;
+ u32 next1 = SNAT_OUT2IN_NEXT_DROP;
+ u32 sw_if_index0, sw_if_index1;
+ ip4_header_t * ip0, *ip1;
+ ip_csum_t sum0, sum1;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_port0;
+ u32 new_addr1, old_addr1;
+ u16 new_port1, old_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, kv1, value0, 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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+ 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;
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace0;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now);
+ goto trace0;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ goto trace0;
+ else
+ s0 = pool_elt_at_index (sm->sessions, value0.value);
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_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,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->ports.dst;
+ tcp0->ports.dst = s0->in2out.port;
+ new_port0 = tcp0->ports.dst;
+
+ 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->dst_port;
+ udp0->dst_port = s0->in2out.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_out2in_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ 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_OUT2IN_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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b1->current_config_index,
+ &next1,
+ 0 /* sizeof config data */);
+ 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;
+
+ if (PREDICT_FALSE (proto1 == ~0))
+ goto trace1;
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = icmp_out2in_slow_path
+ (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
+ next1, now);
+ goto trace1;
+ }
+
+ key1.addr = ip1->dst_address;
+ key1.port = udp1->dst_port;
+ key1.protocol = proto1;
+ key1.fib_index = rx_fib_index1;
+
+ kv1.key = key1.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv1, &value1))
+ goto trace1;
+ else
+ s1 = pool_elt_at_index (sm->sessions, value1.value);
+
+ old_addr1 = ip1->dst_address.as_u32;
+ ip1->dst_address = s1->in2out.addr;
+ new_addr1 = ip1->dst_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,
+ dst_address /* changed member */);
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP))
+ {
+ old_port1 = tcp1->ports.dst;
+ tcp1->ports.dst = s1->in2out.port;
+ new_port1 = tcp1->ports.dst;
+
+ 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->dst_port;
+ udp1->dst_port = s1->in2out.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);
+ trace1:
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_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 += next0 != SNAT_OUT2IN_NEXT_DROP;
+ pkts_processed += next1 != SNAT_OUT2IN_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 = SNAT_OUT2IN_NEXT_DROP;
+ u32 sw_if_index0;
+ ip4_header_t * ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_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);
+
+ 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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+ 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;
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace00;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now);
+ goto trace00;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ goto trace00;
+ else
+ s0 = pool_elt_at_index (sm->sessions, value0.value);
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_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,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->ports.dst;
+ tcp0->ports.dst = s0->in2out.port;
+ new_port0 = tcp0->ports.dst;
+
+ 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->dst_port;
+ udp0->dst_port = s0->in2out.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_out2in_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ 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_OUT2IN_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_out2in_node.index,
+ SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_out2in_node) = {
+ .function = snat_out2in_node_fn,
+ .name = "snat-out2in",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_out2in_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ },
+};
+VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);
diff --git a/plugins/snat-plugin/snat/snat.api b/plugins/snat-plugin/snat/snat.api
new file mode 100644
index 00000000000..0c5f4373f87
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat.api
@@ -0,0 +1,25 @@
+define snat_add_address_range {
+ u32 client_index;
+ u32 context;
+ u8 is_ip4;
+ u8 first_ip_address[16];
+ u8 last_ip_address[16];
+};
+
+define snat_add_address_range_reply {
+ u32 context;
+ i32 retval;
+};
+
+define snat_interface_add_del_feature {
+ u32 client_index;
+ u32 context;
+ u8 is_add;
+ u8 is_inside;
+ u32 sw_if_index;
+};
+
+define snat_interface_add_del_feature_reply {
+ u32 context;
+ i32 retval;
+};
diff --git a/plugins/snat-plugin/snat/snat.c b/plugins/snat-plugin/snat/snat.c
new file mode 100644
index 00000000000..3675602e917
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat.c
@@ -0,0 +1,716 @@
+/*
+ * snat.c - simple nat plugin
+ *
+ * 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 <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+#include <vlibapi/api.h>
+#include <snat/snat.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+
+snat_main_t snat_main;
+
+/* define message IDs */
+#include <snat/snat_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <snat/snat_all_api_h.h>
+#undef vl_typedefs
+
+/* define generated endian-swappers */
+#define vl_endianfun
+#include <snat/snat_all_api_h.h>
+#undef vl_endianfun
+
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <snat/snat_all_api_h.h>
+#undef vl_api_version
+
+/* Macro to finish up custom dump fns */
+#define FINISH \
+ vec_add1 (s, 0); \
+ vl_print (handle, (char *)s); \
+ vec_free (s); \
+ return handle;
+
+/*
+ * A handy macro to set up a message reply.
+ * Assumes that the following variables are available:
+ * mp - pointer to request message
+ * rmp - pointer to reply message type
+ * rv - return value
+ */
+
+#define REPLY_MACRO(t) \
+do { \
+ unix_shared_memory_queue_t * q = \
+ vl_api_client_index_to_input_queue (mp->client_index); \
+ if (!q) \
+ return; \
+ \
+ rmp = vl_msg_api_alloc (sizeof (*rmp)); \
+ rmp->_vl_msg_id = ntohs((t)+sm->msg_id_base); \
+ rmp->context = mp->context; \
+ rmp->retval = ntohl(rv); \
+ \
+ vl_msg_api_send_shmem (q, (u8 *)&rmp); \
+} while(0);
+
+
+/* Hook up input features */
+VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_in2out, static) = {
+ .node_name = "snat-in2out",
+ .runs_before = {"snat-out2in", 0},
+ .feature_index = &snat_main.rx_feature_in2out,
+};
+VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_out2in, static) = {
+ .node_name = "snat-out2in",
+ .runs_before = {"ip4-lookup", 0},
+ .feature_index = &snat_main.rx_feature_out2in,
+};
+
+/*
+ * This routine exists to convince the vlib plugin framework that
+ * we haven't accidentally copied a random .dll into the plugin directory.
+ *
+ * Also collects global variable pointers passed from the vpp engine
+ */
+
+clib_error_t *
+vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h,
+ int from_early_init)
+{
+ snat_main_t * sm = &snat_main;
+ clib_error_t * error = 0;
+
+ sm->vlib_main = vm;
+ sm->vnet_main = h->vnet_main;
+ sm->ethernet_main = h->ethernet_main;
+
+ return error;
+}
+
+/*$$$$$ move to an installed header file */
+#if (1 || CLIB_DEBUG > 0) /* "trust, but verify" */
+
+#define VALIDATE_SW_IF_INDEX(mp) \
+ do { u32 __sw_if_index = ntohl(mp->sw_if_index); \
+ vnet_main_t *__vnm = vnet_get_main(); \
+ if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
+ __sw_if_index)) { \
+ rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \
+ goto bad_sw_if_index; \
+ } \
+} while(0);
+
+#define BAD_SW_IF_INDEX_LABEL \
+do { \
+bad_sw_if_index: \
+ ; \
+} while (0);
+
+#define VALIDATE_RX_SW_IF_INDEX(mp) \
+ do { u32 __rx_sw_if_index = ntohl(mp->rx_sw_if_index); \
+ vnet_main_t *__vnm = vnet_get_main(); \
+ if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
+ __rx_sw_if_index)) { \
+ rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \
+ goto bad_rx_sw_if_index; \
+ } \
+} while(0);
+
+#define BAD_RX_SW_IF_INDEX_LABEL \
+do { \
+bad_rx_sw_if_index: \
+ ; \
+} while (0);
+
+#define VALIDATE_TX_SW_IF_INDEX(mp) \
+ do { u32 __tx_sw_if_index = ntohl(mp->tx_sw_if_index); \
+ vnet_main_t *__vnm = vnet_get_main(); \
+ if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
+ __tx_sw_if_index)) { \
+ rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \
+ goto bad_tx_sw_if_index; \
+ } \
+} while(0);
+
+#define BAD_TX_SW_IF_INDEX_LABEL \
+do { \
+bad_tx_sw_if_index: \
+ ; \
+} while (0);
+
+#else
+
+#define VALIDATE_SW_IF_INDEX(mp)
+#define BAD_SW_IF_INDEX_LABEL
+#define VALIDATE_RX_SW_IF_INDEX(mp)
+#define BAD_RX_SW_IF_INDEX_LABEL
+#define VALIDATE_TX_SW_IF_INDEX(mp)
+#define BAD_TX_SW_IF_INDEX_LABEL
+
+#endif /* CLIB_DEBUG > 0 */
+
+void snat_add_address (snat_main_t *sm, ip4_address_t *addr)
+{
+ snat_address_t * ap;
+
+ vec_add2 (sm->addresses, ap, 1);
+ ap->addr = *addr;
+
+}
+
+static void increment_v4_address (ip4_address_t * a)
+{
+ u32 v;
+
+ v = clib_net_to_host_u32(a->as_u32) + 1;
+ a->as_u32 = clib_host_to_net_u32(v);
+}
+
+static void
+vl_api_snat_add_address_range_t_handler
+(vl_api_snat_add_address_range_t * mp)
+{
+ snat_main_t * sm = &snat_main;
+ vl_api_snat_add_address_range_reply_t * rmp;
+ ip4_address_t this_addr;
+ u32 start_host_order, end_host_order;
+ int i, count;
+ int rv = 0;
+ u32 * tmp;
+
+ if (mp->is_ip4 != 1)
+ {
+ rv = VNET_API_ERROR_UNIMPLEMENTED;
+ goto send_reply;
+ }
+
+ tmp = (u32 *) mp->first_ip_address;
+ start_host_order = clib_host_to_net_u32 (tmp[0]);
+ tmp = (u32 *) mp->last_ip_address;
+ end_host_order = clib_host_to_net_u32 (tmp[0]);
+
+ count = (end_host_order - start_host_order) + 1;
+
+ if (count > 1024)
+ clib_warning ("%U - %U, %d addresses...",
+ format_ip4_address, mp->first_ip_address,
+ format_ip4_address, mp->last_ip_address,
+ count);
+
+ memcpy (&this_addr.as_u8, mp->first_ip_address, 4);
+
+ for (i = 0; i < count; i++)
+ {
+ snat_add_address (sm, &this_addr);
+ increment_v4_address (&this_addr);
+ }
+
+ send_reply:
+ REPLY_MACRO (VL_API_SNAT_ADD_ADDRESS_RANGE_REPLY);
+}
+
+static void *vl_api_snat_add_address_range_t_print
+(vl_api_snat_add_address_range_t *mp, void * handle)
+{
+ u8 * s;
+
+ s = format (0, "SCRIPT: snat_add_address_range ");
+ s = format (s, "%U ", format_ip4_address, mp->first_ip_address);
+ if (memcmp (mp->first_ip_address, mp->last_ip_address, 4))
+ {
+ s = format (s, " - %U ", format_ip4_address, mp->last_ip_address);
+ }
+ FINISH;
+}
+
+static void
+vl_api_snat_interface_add_del_feature_t_handler
+(vl_api_snat_interface_add_del_feature_t * mp)
+{
+ snat_main_t * sm = &snat_main;
+ vl_api_snat_interface_add_del_feature_reply_t * rmp;
+ u8 is_del = mp->is_add == 0;
+ u32 sw_if_index = ntohl(mp->sw_if_index);
+ u32 ci;
+ ip4_main_t * im = &ip4_main;
+ ip_lookup_main_t * lm = &im->lookup_main;
+ ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
+ u32 feature_index;
+ int rv = 0;
+
+ VALIDATE_SW_IF_INDEX(mp);
+
+ feature_index = mp->is_inside ? sm->rx_feature_in2out
+ : sm->rx_feature_out2in;
+
+ ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
+ ci = (is_del
+ ? vnet_config_del_feature
+ : vnet_config_add_feature)
+ (sm->vlib_main, &rx_cm->config_main,
+ ci,
+ feature_index,
+ 0 /* config struct */,
+ 0 /* sizeof config struct*/);
+ rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
+
+ BAD_SW_IF_INDEX_LABEL;
+
+ REPLY_MACRO(VL_API_SNAT_INTERFACE_ADD_DEL_FEATURE_REPLY);
+}
+
+static void *vl_api_snat_interface_add_del_feature_t_print
+(vl_api_snat_interface_add_del_feature_t * mp, void *handle)
+{
+ u8 * s;
+
+ s = format (0, "SCRIPT: snat_interface_add_del_feature ");
+ s = format (s, "sw_if_index %d %s %s",
+ clib_host_to_net_u32(mp->sw_if_index),
+ mp->is_inside ? "in":"out",
+ mp->is_add ? "" : "del");
+
+ FINISH;
+}
+
+/* List of message types that this plugin understands */
+#define foreach_snat_plugin_api_msg \
+_(SNAT_ADD_ADDRESS_RANGE, snat_add_address_range) \
+_(SNAT_INTERFACE_ADD_DEL_FEATURE, snat_interface_add_del_feature)
+
+/* Set up the API message handling tables */
+static clib_error_t *
+snat_plugin_api_hookup (vlib_main_t *vm)
+{
+ snat_main_t * sm __attribute__ ((unused)) = &snat_main;
+#define _(N,n) \
+ vl_msg_api_set_handlers((VL_API_##N + sm->msg_id_base), \
+ #n, \
+ vl_api_##n##_t_handler, \
+ vl_noop_handler, \
+ vl_api_##n##_t_endian, \
+ vl_api_##n##_t_print, \
+ sizeof(vl_api_##n##_t), 1);
+ foreach_snat_plugin_api_msg;
+#undef _
+
+ return 0;
+}
+
+static void plugin_custom_dump_configure (snat_main_t * sm)
+{
+#define _(n,f) sm->api_main->msg_print_handlers \
+ [VL_API_##n + sm->msg_id_base] \
+ = (void *) vl_api_##f##_t_print;
+ foreach_snat_plugin_api_msg;
+#undef _
+}
+
+static clib_error_t * snat_init (vlib_main_t * vm)
+{
+ snat_main_t * sm = &snat_main;
+ clib_error_t * error = 0;
+ ip4_main_t * im = &ip4_main;
+ ip_lookup_main_t * lm = &im->lookup_main;
+ u8 * name;
+
+ name = format (0, "snat_%08x%c", api_version, 0);
+
+ /* Ask for a correctly-sized block of API message decode slots */
+ sm->msg_id_base = vl_msg_api_get_msg_ids
+ ((char *) name, VL_MSG_FIRST_AVAILABLE);
+
+ sm->vlib_main = vm;
+ sm->vnet_main = vnet_get_main();
+ sm->ip4_main = im;
+ sm->ip4_lookup_main = lm;
+ sm->api_main = &api_main;
+
+ error = snat_plugin_api_hookup (vm);
+ plugin_custom_dump_configure (sm);
+ vec_free(name);
+
+ return error;
+}
+
+VLIB_INIT_FUNCTION (snat_init);
+
+void snat_free_outside_address_and_port (snat_main_t * sm,
+ snat_session_key_t * k,
+ u32 address_index)
+{
+ snat_address_t *a;
+ u16 port_host_byte_order = clib_net_to_host_u16 (k->port);
+
+ ASSERT (address_index < vec_len (sm->addresses));
+
+ a = sm->addresses + address_index;
+
+ ASSERT (clib_bitmap_get (a->busy_port_bitmap, port_host_byte_order) == 1);
+
+ a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap,
+ port_host_byte_order, 0);
+ a->busy_ports--;
+}
+
+int snat_alloc_outside_address_and_port (snat_main_t * sm,
+ snat_session_key_t * k,
+ u32 * address_indexp)
+{
+ int i;
+ snat_address_t *a;
+ u32 portnum;
+
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ if (sm->addresses[i].busy_ports < (65535-1024))
+ {
+ a = sm->addresses + i;
+
+ while (1)
+ {
+ portnum = random_u32 (&sm->random_seed);
+ portnum &= 0xFFFF;
+ if (portnum < 1024)
+ continue;
+ if (clib_bitmap_get (a->busy_port_bitmap, portnum))
+ continue;
+ a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap,
+ portnum, 1);
+ a->busy_ports++;
+ /* Caller sets protocol and fib index */
+ k->addr = a->addr;
+ k->port = clib_host_to_net_u16(portnum);
+ *address_indexp = i;
+ return 0;
+ }
+ }
+ }
+ /* Totally out of translations to use... */
+ return 1;
+}
+
+
+static clib_error_t *
+add_address_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ snat_main_t * sm = &snat_main;
+ ip4_address_t start_addr, end_addr, this_addr;
+ u32 start_host_order, end_host_order;
+ int i, count;
+
+ if (unformat (input, "%U - %U",
+ unformat_ip4_address, &start_addr,
+ unformat_ip4_address, &end_addr))
+ ;
+ else if (unformat (input, "%U", unformat_ip4_address, &start_addr))
+ end_addr = start_addr;
+
+ start_host_order = clib_host_to_net_u32 (start_addr.as_u32);
+ end_host_order = clib_host_to_net_u32 (end_addr.as_u32);
+
+ if (end_host_order < start_host_order)
+ return clib_error_return (0, "end address less than start address");
+
+ count = (end_host_order - start_host_order) + 1;
+
+ if (count > 1024)
+ clib_warning ("%U - %U, %d addresses...",
+ format_ip4_address, &start_addr,
+ format_ip4_address, &end_addr,
+ count);
+
+ this_addr = start_addr;
+
+ for (i = 0; i < count; i++)
+ {
+ snat_add_address (sm, &this_addr);
+ increment_v4_address (&this_addr);
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (add_address_command, static) = {
+ .path = "snat add address",
+ .short_help = "snat add addresses <ip4-range-start> [- <ip4-range-end>]",
+ .function = add_address_command_fn,
+};
+
+static clib_error_t *
+snat_feature_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ vnet_main_t * vnm = vnet_get_main();
+ snat_main_t * sm = &snat_main;
+ ip4_main_t * im = &ip4_main;
+ ip_lookup_main_t * lm = &im->lookup_main;
+ ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
+ clib_error_t * error = 0;
+ u32 sw_if_index, ci;
+ u32 feature_index;
+ u32 * inside_sw_if_indices = 0;
+ u32 * outside_sw_if_indices = 0;
+ int is_del = 0;
+ int i;
+
+ sw_if_index = ~0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "in %U", unformat_vnet_sw_interface,
+ vnm, &sw_if_index))
+ vec_add1 (inside_sw_if_indices, sw_if_index);
+ else if (unformat (input, "out %U", unformat_vnet_sw_interface,
+ vnm, &sw_if_index))
+ vec_add1 (outside_sw_if_indices, sw_if_index);
+ else if (unformat (input, "del"))
+ is_del = 1;
+ else
+ break;
+ }
+
+ if (vec_len (inside_sw_if_indices))
+ {
+ feature_index = sm->rx_feature_in2out;
+
+ for (i = 0; i < vec_len(inside_sw_if_indices); i++)
+ {
+ sw_if_index = inside_sw_if_indices[i];
+ ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
+ ci = (is_del
+ ? vnet_config_del_feature
+ : vnet_config_add_feature)
+ (vm, &rx_cm->config_main,
+ ci,
+ feature_index,
+ 0 /* config struct */,
+ 0 /* sizeof config struct*/);
+ rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
+ }
+ }
+
+ if (vec_len (outside_sw_if_indices))
+ {
+ feature_index = sm->rx_feature_out2in;
+
+ for (i = 0; i < vec_len(outside_sw_if_indices); i++)
+ {
+ sw_if_index = outside_sw_if_indices[i];
+ ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
+ ci = (is_del
+ ? vnet_config_del_feature
+ : vnet_config_add_feature)
+ (vm, &rx_cm->config_main,
+ ci,
+ feature_index,
+ 0 /* config struct */,
+ 0 /* sizeof config struct*/);
+ rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
+ }
+ }
+
+ vec_free (inside_sw_if_indices);
+ vec_free (outside_sw_if_indices);
+
+ return error;
+}
+
+VLIB_CLI_COMMAND (set_interface_snat_command, static) = {
+ .path = "set interface snat",
+ .function = snat_feature_command_fn,
+ .short_help = "set interface snat in <intfc> out <intfc> [del]",
+};
+
+static clib_error_t *
+snat_config (vlib_main_t * vm, unformat_input_t * input)
+{
+ snat_main_t * sm = &snat_main;
+ u32 translation_buckets = 1024;
+ u32 translation_memory_size = 128<<20;
+ u32 user_buckets = 128;
+ u32 user_memory_size = 64<<20;
+ u32 max_translations_per_user = 100;
+ u32 outside_vrf_id = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "translation hash buckets %d", &translation_buckets))
+ ;
+ else if (unformat (input, "translation hash memory %d",
+ &translation_memory_size));
+ else if (unformat (input, "user hash buckets %d", &user_buckets))
+ ;
+ else if (unformat (input, "user hash memory %d",
+ &user_memory_size))
+ ;
+ else if (unformat (input, "max translations per user %d",
+ &max_translations_per_user))
+ ;
+ else if (unformat (input, "outside VRF id %d",
+ &outside_vrf_id))
+ ;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+
+ /* for show commands, etc. */
+ sm->translation_buckets = translation_buckets;
+ sm->translation_memory_size = translation_memory_size;
+ sm->user_buckets = user_buckets;
+ sm->user_memory_size = user_memory_size;
+ sm->max_translations_per_user = max_translations_per_user;
+ sm->outside_vrf_id = outside_vrf_id;
+
+ clib_bihash_init_8_8 (&sm->in2out, "in2out", translation_buckets,
+ translation_memory_size);
+
+ clib_bihash_init_8_8 (&sm->out2in, "out2in", translation_buckets,
+ translation_memory_size);
+
+ clib_bihash_init_8_8 (&sm->user_hash, "users", user_buckets,
+ user_memory_size);
+ return 0;
+}
+
+VLIB_CONFIG_FUNCTION (snat_config, "snat");
+
+u8 * format_snat_key (u8 * s, va_list * args)
+{
+ snat_session_key_t * key = va_arg (*args, snat_session_key_t *);
+ char * protocol_string = "unknown";
+ static char *protocol_strings[] = {
+ "UDP",
+ "TCP",
+ "ICMP",
+ };
+
+ if (key->protocol < ARRAY_LEN(protocol_strings))
+ protocol_string = protocol_strings[key->protocol];
+
+ s = format (s, "%U proto %s port %d fib %d",
+ format_ip4_address, &key->addr, protocol_string,
+ key->port, key->fib_index);
+ return s;
+}
+
+u8 * format_snat_session (u8 * s, va_list * args)
+{
+ snat_main_t * sm __attribute__((unused)) = va_arg (*args, snat_main_t *);
+ snat_session_t * sess = va_arg (*args, snat_session_t *);
+
+ s = format (s, " i2o %U\n", format_snat_key, &sess->in2out);
+ s = format (s, " o2i %U\n", format_snat_key, &sess->out2in);
+ s = format (s, " last heard %.2f\n", sess->last_heard);
+ s = format (s, " total pkts %d, total bytes %lld\n",
+ sess->total_pkts, sess->total_bytes);
+
+ return s;
+}
+
+u8 * format_snat_user (u8 * s, va_list * args)
+{
+ snat_main_t * sm = va_arg (*args, snat_main_t *);
+ snat_user_t * u = va_arg (*args, snat_user_t *);
+ int verbose = va_arg (*args, int);
+ dlist_elt_t * head, * elt;
+ u32 elt_index, head_index;
+ u32 session_index;
+ snat_session_t * sess;
+
+ s = format (s, "%U: %d translations\n",
+ format_ip4_address, &u->addr, u->nsessions);
+
+ if (verbose == 0)
+ return s;
+
+ head_index = u->sessions_per_user_list_head_index;
+ head = pool_elt_at_index (sm->list_pool, head_index);
+
+ elt_index = head->next;
+ elt = pool_elt_at_index (sm->list_pool, elt_index);
+ session_index = elt->value;
+
+ while (session_index != ~0)
+ {
+ sess = pool_elt_at_index (sm->sessions, session_index);
+
+ s = format (s, " %U\n", format_snat_session, sm, sess);
+
+ elt_index = elt->next;
+ elt = pool_elt_at_index (sm->list_pool, elt_index);
+ session_index = elt->value;
+ }
+
+ return s;
+}
+
+static clib_error_t *
+show_snat_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ int verbose = 0;
+ snat_main_t * sm = &snat_main;
+ snat_user_t * u;
+
+ if (unformat (input, "detail"))
+ verbose = 1;
+ else if (unformat (input, "verbose"))
+ verbose = 2;
+
+ vlib_cli_output (vm, "%d users, %d outside addresses, %d active sessions",
+ pool_elts (sm->users),
+ vec_len (sm->addresses),
+ pool_elts (sm->sessions));
+
+ if (verbose > 0)
+ {
+ vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->in2out,
+ verbose - 1);
+ vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->out2in,
+ verbose - 1);
+ vlib_cli_output (vm, "%d list pool elements",
+ pool_elts (sm->list_pool));
+
+ pool_foreach (u, sm->users,
+ ({
+ vlib_cli_output (vm, "%U", format_snat_user, sm, u, verbose - 1);
+ }));
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (show_snat_command, static) = {
+ .path = "show snat",
+ .short_help = "show snat",
+ .function = show_snat_command_fn,
+};
diff --git a/plugins/snat-plugin/snat/snat.h b/plugins/snat-plugin/snat/snat.h
new file mode 100644
index 00000000000..e3aa56276fb
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat.h
@@ -0,0 +1,181 @@
+
+/*
+ * snat.h - simple nat definitions
+ *
+ * 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.
+ */
+#ifndef __included_snat_h__
+#define __included_snat_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/icmp46_packet.h>
+#include <vnet/api_errno.h>
+#include <vppinfra/bihash_8_8.h>
+#include <vppinfra/dlist.h>
+#include <vppinfra/error.h>
+#include <vlibapi/api.h>
+
+/* Key */
+typedef struct {
+ union
+ {
+ struct
+ {
+ ip4_address_t addr;
+ u16 port;
+ u16 protocol:3,
+ fib_index:13;
+ };
+ u64 as_u64;
+ };
+} snat_session_key_t;
+
+typedef struct {
+ union
+ {
+ struct
+ {
+ ip4_address_t addr;
+ u32 fib_index;
+ };
+ u64 as_u64;
+ };
+} snat_user_key_t;
+
+
+typedef enum {
+ SNAT_PROTOCOL_UDP = 0,
+ SNAT_PROTOCOL_TCP,
+ SNAT_PROTOCOL_ICMP,
+} snat_protocol_t;
+
+
+typedef CLIB_PACKED(struct {
+ snat_session_key_t out2in; /* 0-15 */
+
+ snat_session_key_t in2out; /* 16-31 */
+
+ u32 flags; /* 32-35 */
+
+ /* per-user translations */
+ u32 per_user_index; /* 36-39 */
+
+ u32 per_user_list_head_index; /* 40-43 */
+
+ /* Last heard timer */
+ f64 last_heard; /* 44-51 */
+
+ u64 total_bytes; /* 52-59 */
+
+ u32 total_pkts; /* 60-63 */
+
+ /* Outside address */
+ u32 outside_address_index; /* 64-67 */
+
+}) snat_session_t;
+
+#define SNAT_SESSION_STATIC (1<<0)
+
+typedef struct {
+ ip4_address_t addr;
+ u32 sessions_per_user_list_head_index;
+ u32 nsessions;
+} snat_user_t;
+
+typedef struct {
+ ip4_address_t addr;
+ u32 busy_ports;
+ uword * busy_port_bitmap;
+} snat_address_t;
+
+typedef struct {
+ /* Main lookup tables */
+ clib_bihash_8_8_t out2in;
+ clib_bihash_8_8_t in2out;
+
+ /* Find-a-user => src address lookup */
+ clib_bihash_8_8_t user_hash;
+
+ /* User pool */
+ snat_user_t * users;
+
+ /* Session pool */
+ snat_session_t * sessions;
+
+ /* Vector of outside addresses */
+ snat_address_t * addresses;
+
+ /* Pool of doubly-linked list elements */
+ dlist_elt_t * list_pool;
+
+ /* Randomize port allocation order */
+ u32 random_seed;
+
+ /* ip4 feature path indices */
+ u32 rx_feature_in2out;
+ u32 rx_feature_out2in;
+
+ /* Config parameters */
+ u32 translation_buckets;
+ u32 translation_memory_size;
+ u32 user_buckets;
+ u32 user_memory_size;
+ u32 max_translations_per_user;
+ u32 outside_vrf_id;
+ u32 outside_fib_index;
+
+ /* API message ID base */
+ u16 msg_id_base;
+
+ /* convenience */
+ vlib_main_t * vlib_main;
+ vnet_main_t * vnet_main;
+ ip4_main_t * ip4_main;
+ ip_lookup_main_t * ip4_lookup_main;
+ ethernet_main_t * ethernet_main;
+ api_main_t * api_main;
+} snat_main_t;
+
+extern snat_main_t snat_main;
+extern vlib_node_registration_t snat_in2out_node;
+extern vlib_node_registration_t snat_out2in_node;
+
+void snat_free_outside_address_and_port (snat_main_t * sm,
+ snat_session_key_t * k,
+ u32 address_index);
+
+int snat_alloc_outside_address_and_port (snat_main_t * sm,
+ snat_session_key_t * k,
+ u32 * address_indexp);
+format_function_t format_snat_user;
+
+typedef struct {
+ u32 cached_sw_if_index;
+ u32 cached_ip4_address;
+} snat_runtime_t;
+
+/*
+ * Why is this here? Because we don't need to touch this layer to
+ * simply reply to an icmp. We need to change id to a unique
+ * value to NAT an echo request/reply.
+ */
+
+typedef struct {
+ u16 identifier;
+ u16 sequence;
+} icmp_echo_header_t;
+
+#endif /* __included_snat_h__ */
diff --git a/plugins/snat-plugin/snat/snat_all_api_h.h b/plugins/snat-plugin/snat/snat_all_api_h.h
new file mode 100644
index 00000000000..490177008e0
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat_all_api_h.h
@@ -0,0 +1,19 @@
+
+/*
+ * snat_all_api_h.h - skeleton vpp engine plug-in api #include file
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * 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 the generated file, see BUILT_SOURCES in Makefile.am */
+#include <snat/snat.api.h>
diff --git a/plugins/snat-plugin/snat/snat_msg_enum.h b/plugins/snat-plugin/snat/snat_msg_enum.h
new file mode 100644
index 00000000000..2c76fd51158
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat_msg_enum.h
@@ -0,0 +1,31 @@
+
+/*
+ * snat_msg_enum.h - skeleton vpp engine plug-in message enumeration
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * 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.
+ */
+#ifndef included_snat_msg_enum_h
+#define included_snat_msg_enum_h
+
+#include <vppinfra/byte_order.h>
+
+#define vl_msg_id(n,h) n,
+typedef enum {
+#include <snat/snat_all_api_h.h>
+ /* We'll want to know how many messages IDs we need... */
+ VL_MSG_FIRST_AVAILABLE,
+} vl_msg_id_t;
+#undef vl_msg_id
+
+#endif /* included_snat_msg_enum_h */
diff --git a/plugins/snat-plugin/snat/snat_test.c b/plugins/snat-plugin/snat/snat_test.c
new file mode 100644
index 00000000000..cd2656cbdaf
--- /dev/null
+++ b/plugins/snat-plugin/snat/snat_test.c
@@ -0,0 +1,265 @@
+
+/*
+ * snat.c - skeleton vpp-api-test plug-in
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * 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 <vat/vat.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+#include <vppinfra/error.h>
+#include <vnet/ip/ip.h>
+
+uword unformat_sw_if_index (unformat_input_t * input, va_list * args);
+
+/* Declare message IDs */
+#include <snat/snat_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <snat/snat_all_api_h.h>
+#undef vl_typedefs
+
+/* declare message handlers for each api */
+
+#define vl_endianfun /* define message structures */
+#include <snat/snat_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...)
+#define vl_printfun
+#include <snat/snat_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number. */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <snat/snat_all_api_h.h>
+#undef vl_api_version
+
+typedef struct {
+ /* API message ID base */
+ u16 msg_id_base;
+ vat_main_t *vat_main;
+} snat_test_main_t;
+
+snat_test_main_t snat_test_main;
+
+#define foreach_standard_reply_retval_handler \
+_(snat_add_address_range_reply) \
+_(snat_interface_add_del_feature_reply)
+
+#define _(n) \
+ static void vl_api_##n##_t_handler \
+ (vl_api_##n##_t * mp) \
+ { \
+ vat_main_t * vam = snat_test_main.vat_main; \
+ i32 retval = ntohl(mp->retval); \
+ if (vam->async_mode) { \
+ vam->async_errors += (retval < 0); \
+ } else { \
+ vam->retval = retval; \
+ vam->result_ready = 1; \
+ } \
+ }
+foreach_standard_reply_retval_handler;
+#undef _
+
+/*
+ * Table of message reply handlers, must include boilerplate handlers
+ * we just generated
+ */
+#define foreach_vpe_api_reply_msg \
+_(SNAT_ADD_ADDRESS_RANGE_REPLY, snat_add_address_range_reply) \
+ _(SNAT_INTERFACE_ADD_DEL_FEATURE_REPLY, \
+ snat_interface_add_del_feature_reply)
+
+/* M: construct, but don't yet send a message */
+#define M(T,t) \
+do { \
+ vam->result_ready = 0; \
+ mp = vl_msg_api_alloc(sizeof(*mp)); \
+ memset (mp, 0, sizeof (*mp)); \
+ mp->_vl_msg_id = ntohs (VL_API_##T + sm->msg_id_base); \
+ mp->client_index = vam->my_client_index; \
+} while(0);
+
+#define M2(T,t,n) \
+do { \
+ vam->result_ready = 0; \
+ mp = vl_msg_api_alloc(sizeof(*mp)+(n)); \
+ memset (mp, 0, sizeof (*mp)); \
+ mp->_vl_msg_id = ntohs (VL_API_##T + sm->msg_id_base); \
+ mp->client_index = vam->my_client_index; \
+} while(0);
+
+/* S: send a message */
+#define S (vl_msg_api_send_shmem (vam->vl_input_queue, (u8 *)&mp))
+
+/* W: wait for results, with timeout */
+#define W \
+do { \
+ timeout = vat_time_now (vam) + 1.0; \
+ \
+ while (vat_time_now (vam) < timeout) { \
+ if (vam->result_ready == 1) { \
+ return (vam->retval); \
+ } \
+ } \
+ return -99; \
+} while(0);
+
+static int api_snat_add_address_range (vat_main_t * vam)
+{
+ snat_test_main_t * sm = &snat_test_main;
+ unformat_input_t * i = vam->input;
+ f64 timeout;
+ ip4_address_t start_addr, end_addr;
+ u32 start_host_order, end_host_order;
+ vl_api_snat_add_address_range_t * mp;
+ int count;
+
+ if (unformat (i, "%U - %U",
+ unformat_ip4_address, &start_addr,
+ unformat_ip4_address, &end_addr))
+ ;
+ else if (unformat (i, "%U", unformat_ip4_address, &start_addr))
+ end_addr = start_addr;
+
+ start_host_order = clib_host_to_net_u32 (start_addr.as_u32);
+ end_host_order = clib_host_to_net_u32 (end_addr.as_u32);
+
+ if (end_host_order < start_host_order)
+ {
+ errmsg ("end address less than start address\n");
+ return -99;
+ }
+
+ count = (end_host_order - start_host_order) + 1;
+
+ if (count > 1024)
+ {
+ errmsg ("%U - %U, %d addresses...\n",
+ format_ip4_address, &start_addr,
+ format_ip4_address, &end_addr,
+ count);
+ }
+
+ M(SNAT_ADD_ADDRESS_RANGE, snat_add_address_range);
+
+ memcpy (mp->first_ip_address, &start_addr, 4);
+ memcpy (mp->last_ip_address, &end_addr, 4);
+ mp->is_ip4 = 1;
+
+ S; W;
+
+ /* NOTREACHED */
+ return 0;
+}
+
+static int api_snat_interface_add_del_feature (vat_main_t * vam)
+{
+ snat_test_main_t * sm = &snat_test_main;
+ unformat_input_t * i = vam->input;
+ f64 timeout;
+ vl_api_snat_interface_add_del_feature_t * mp;
+ u32 sw_if_index;
+ u8 sw_if_index_set = 0;
+ u8 is_inside = 1;
+ u8 is_add = 1;
+
+ while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (i, "%U", unformat_sw_if_index, vam, &sw_if_index))
+ sw_if_index_set = 1;
+ else if (unformat (i, "sw_if_index %d", &sw_if_index))
+ sw_if_index_set = 1;
+ else if (unformat (i, "out"))
+ is_inside = 0;
+ else if (unformat (i, "in"))
+ is_inside = 1;
+ else if (unformat (i, "del"))
+ is_add = 0;
+ }
+
+ if (sw_if_index_set == 0)
+ {
+ errmsg ("interface / sw_if_index required\n");
+ return -99;
+ }
+
+ M(SNAT_INTERFACE_ADD_DEL_FEATURE, snat_interface_add_del_feature);
+ mp->sw_if_index = ntohl(sw_if_index);
+ mp->is_add = is_add;
+ mp->is_inside = is_inside;
+
+ S; W;
+ /* NOTREACHED */
+ return 0;
+}
+
+/*
+ * List of messages that the api test plugin sends,
+ * and that the data plane plugin processes
+ */
+#define foreach_vpe_api_msg \
+_(snat_add_address_range, "<start-addr> [- <end-addr]") \
+_(snat_interface_add_del_feature, \
+ "<intfc> | sw_if_index <id> [in] [out] [del]")
+
+void vat_api_hookup (vat_main_t *vam)
+{
+ snat_test_main_t * sm __attribute__((unused)) = &snat_test_main;
+ /* Hook up handlers for replies from the data plane plug-in */
+#define _(N,n) \
+ vl_msg_api_set_handlers((VL_API_##N + sm->msg_id_base), \
+ #n, \
+ vl_api_##n##_t_handler, \
+ vl_noop_handler, \
+ vl_api_##n##_t_endian, \
+ vl_api_##n##_t_print, \
+ sizeof(vl_api_##n##_t), 1);
+ foreach_vpe_api_reply_msg;
+#undef _
+
+ /* API messages we can send */
+#define _(n,h) hash_set_mem (vam->function_by_name, #n, api_##n);
+ foreach_vpe_api_msg;
+#undef _
+
+ /* Help strings */
+#define _(n,h) hash_set_mem (vam->help_by_name, #n, h);
+ foreach_vpe_api_msg;
+#undef _
+}
+
+clib_error_t * vat_plugin_register (vat_main_t *vam)
+{
+ snat_test_main_t * sm = &snat_test_main;
+ u8 * name;
+
+ sm->vat_main = vam;
+
+ /* Ask the vpp engine for the first assigned message-id */
+ name = format (0, "snat_%08x%c", api_version, 0);
+ sm->msg_id_base = vl_client_get_first_plugin_msg_id ((char *) name);
+
+ if (sm->msg_id_base != (u16) ~0)
+ vat_api_hookup (vam);
+
+ vec_free(name);
+
+ return 0;
+}