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authorOle Troan <ot@cisco.com>2021-01-12 21:49:38 +0100
committerNeale Ranns <neale@graphiant.com>2021-02-05 13:27:48 +0000
commit18327be5d458f9f73c12d76e677ee5a068ec6b10 (patch)
treebac6dbc08280e5bd6d5749ea56c862e6cdc38434 /src/plugins/nat/pnat/pnat.h
parent490b92738f3cc1c8d534abd6dee8dba942cb652d (diff)
nat: 1:1 policy NAT
A NAT sub-plugin doing statically configured match/rewrite on IP4 input or output. It's stateless (no connection tracking). Currently it supports rewriting of SA, DA and TCP/UDP ports. It should be simple to add new rewrites if required. API: pnat_binding_add, pnat_binding_del, pnat_bindings_get, pnat_interfaces_get CLI: set pnat translation interface <name> match <5-tuple> rewrite <5-tuple> {in|out} [del] show pnat translations show pnat interfaces Trying a new C based unit testing scheme. Where the graph node is tested in isolation. See pnat/pnat_test.c. Also added new cmake targets to generate coverage directly. E.g.: make test_pnat-ccov-report File '/vpp/sdnat/src/plugins/nat/pnat/pnat.c': Name Regions Miss Cover Lines Miss Cover ------------------------------------------------------------------------------------ pnat_interface_by_sw_if_index 39 8 79.49% 13 0 100.00% pnat_instructions_from_mask 9 0 100.00% 13 0 100.00% pnat_binding_add 64 8 87.50% 31 2 93.55% pnat_flow_lookup 4 4 0.00% 10 10 0.00% pnat_binding_attach 104 75 27.88% 33 6 81.82% pnat_binding_detach 30 5 83.33% 23 2 91.30% pnat_binding_del 97 33 65.98% 17 3 82.35% pnat.c:pnat_calc_key_from_5tuple 9 1 88.89% 14 1 92.86% pnat.c:pnat_interface_check_mask 10 2 80.00% 11 2 81.82% pnat.c:pnat_enable 5 0 100.00% 11 0 100.00% pnat.c:pnat_enable_interface 107 26 75.70% 60 15 75.00% pnat.c:pnat_disable_interface 91 30 67.03% 32 7 78.12% pnat.c:pnat_disable 7 2 71.43% 13 7 46.15% ------------------------------------------------------------------------------------ TOTAL 576 194 66.32% 281 55 80.43% File '/vpp/sdnat/src/plugins/nat/pnat/pnat_node.h': Name Regions Miss Cover Lines Miss Cover ------------------------------------------------------------------------------------ pnat_test.c:pnat_node_inline 67 11 83.58% 115 1 99.13% pnat_test.c:pnat_calc_key 9 2 77.78% 14 2 85.71% pnat_test.c:pnat_rewrite_ip4 55 11 80.00% 60 12 80.00% pnat_test.c:format_pnat_trace 1 1 0.00% 12 12 0.00% pnat_node.c:pnat_node_inline 63 63 0.00% 115 115 0.00% pnat_node.c:pnat_calc_key 9 9 0.00% 14 14 0.00% pnat_node.c:pnat_rewrite_ip4 55 55 0.00% 60 60 0.00% pnat_node.c:format_pnat_trace 5 5 0.00% 12 12 0.00% ------------------------------------------------------------------------------------ TOTAL 264 157 40.53% 402 228 43.28% Type: feature Change-Id: I9c897f833603054a8303e7369ebff6512517c9e0 Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/plugins/nat/pnat/pnat.h')
-rw-r--r--src/plugins/nat/pnat/pnat.h121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/plugins/nat/pnat/pnat.h b/src/plugins/nat/pnat/pnat.h
new file mode 100644
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+++ b/src/plugins/nat/pnat/pnat.h
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021 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_pnat_h
+#define included_pnat_h
+
+#include <stdbool.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vppinfra/bihash_16_8.h>
+
+#define PNAT_FLOW_HASH_BUCKETS 256
+
+/* Definitions from pnat.api */
+#include <pnat/pnat.api_types.h>
+typedef vl_api_pnat_5tuple_t pnat_5tuple_t;
+typedef vl_api_pnat_mask_t pnat_mask_t;
+typedef vl_api_pnat_attachment_point_t pnat_attachment_point_t;
+
+/* Rewrite instructions */
+typedef enum {
+ PNAT_INSTR_NONE = 1 << 0,
+ PNAT_INSTR_SOURCE_ADDRESS = 1 << 1,
+ PNAT_INSTR_SOURCE_PORT = 1 << 2,
+ PNAT_INSTR_DESTINATION_ADDRESS = 1 << 3,
+ PNAT_INSTR_DESTINATION_PORT = 1 << 4,
+} pnat_instructions_t;
+
+typedef struct {
+ u64 as_u64[2];
+} pnat_mask_fast_t;
+
+/* Session cache entries */
+typedef struct {
+ /* What to translate to */
+ pnat_instructions_t instructions;
+
+ /* Stored in network byte order */
+ ip4_address_t post_sa;
+ ip4_address_t post_da;
+ u16 post_sp;
+ u16 post_dp;
+
+ /* Used for trace/show commands */
+ pnat_5tuple_t match;
+ pnat_5tuple_t rewrite;
+} pnat_translation_t;
+
+/* Interface object */
+typedef struct {
+ u32 sw_if_index;
+ pnat_mask_t lookup_mask[PNAT_ATTACHMENT_POINT_MAX];
+ pnat_mask_fast_t lookup_mask_fast[PNAT_ATTACHMENT_POINT_MAX];
+
+ /* Feature chain enabled on interface */
+ bool enabled[PNAT_ATTACHMENT_POINT_MAX];
+
+ u32 refcount;
+} pnat_interface_t;
+
+/* Globals */
+typedef struct {
+ bool enabled;
+
+ clib_bihash_16_8_t flowhash; /* Bi-directional */
+
+ /* Interface pool */
+ pnat_interface_t *interfaces;
+ u32 *interface_by_sw_if_index;
+
+ /* Translations pool */
+ pnat_translation_t *translations;
+
+ u16 msg_id_base;
+} pnat_main_t;
+extern pnat_main_t pnat_main;
+
+pnat_interface_t *pnat_interface_by_sw_if_index(u32 sw_if_index);
+
+/* Packet trace information */
+typedef struct {
+ u32 pool_index;
+ pnat_5tuple_t match;
+ pnat_5tuple_t rewrite;
+} pnat_trace_t;
+
+int pnat_binding_add(pnat_5tuple_t *match, pnat_5tuple_t *rewrite,
+ u32 *binding_index);
+int pnat_binding_del(u32 binding_index);
+int pnat_binding_attach(u32 sw_if_index, pnat_attachment_point_t attachment,
+ u32 binding_index);
+int pnat_binding_detach(u32 sw_if_index, pnat_attachment_point_t attachment,
+ u32 binding_index);
+u32 pnat_flow_lookup(u32 sw_if_index, pnat_attachment_point_t attachment,
+ pnat_5tuple_t *match);
+
+static inline void
+pnat_calc_key(u32 sw_if_index, pnat_attachment_point_t attachment,
+ ip4_address_t src, ip4_address_t dst, u8 protocol, u16 sport,
+ u16 dport, pnat_mask_fast_t mask, clib_bihash_kv_16_8_t *kv) {
+ kv->key[0] = kv->key[1] = 0;
+ kv->key[0] = (u64)src.as_u32 << 32 | dst.as_u32;
+ kv->key[0] &= mask.as_u64[0];
+ kv->key[1] |=
+ (u64)protocol << 56 | (u64)sw_if_index << 36 | (u64)attachment << 32;
+ kv->key[1] |= sport << 16 | dport;
+ kv->key[1] &= mask.as_u64[1];
+}
+
+#endif