2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 * @brief NAT66 inside to outside network translation
20 #include <nat/nat66.h>
21 #include <vnet/ip/ip6_to_ip4.h>
22 #include <vnet/fib/fib_table.h>
28 } nat66_in2out_trace_t;
31 format_nat66_in2out_trace (u8 * s, va_list * args)
33 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
34 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
35 nat66_in2out_trace_t *t = va_arg (*args, nat66_in2out_trace_t *);
38 format (s, "NAT66-in2out: sw_if_index %d, next index %d", t->sw_if_index,
44 vlib_node_registration_t nat66_in2out_node;
46 #define foreach_nat66_in2out_error \
47 _(IN2OUT_PACKETS, "good in2out packets processed") \
48 _(NO_TRANSLATION, "no translation") \
53 #define _(sym,str) NAT66_IN2OUT_ERROR_##sym,
54 foreach_nat66_in2out_error
57 } nat66_in2out_error_t;
59 static char *nat66_in2out_error_strings[] = {
60 #define _(sym,string) string,
61 foreach_nat66_in2out_error
67 NAT66_IN2OUT_NEXT_IP6_LOOKUP,
68 NAT66_IN2OUT_NEXT_DROP,
70 } nat66_in2out_next_t;
73 nat66_not_translate (u32 rx_fib_index, ip6_address_t ip6_addr)
75 nat66_main_t *nm = &nat66_main;
78 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
80 .fp_proto = FIB_PROTOCOL_IP6,
87 fei = fib_table_lookup (rx_fib_index, &pfx);
88 if (FIB_NODE_INDEX_INVALID == fei)
90 sw_if_index = fib_entry_get_resolving_interface (fei);
92 if (sw_if_index == ~0)
94 fei = fib_table_lookup (nm->outside_fib_index, &pfx);
95 if (FIB_NODE_INDEX_INVALID == fei)
97 sw_if_index = fib_entry_get_resolving_interface (fei);
101 pool_foreach (i, nm->interfaces,
103 /* NAT packet aimed at outside interface */
104 if (nat_interface_is_outside (i) && sw_if_index == i->sw_if_index)
113 nat66_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
114 vlib_frame_t * frame)
116 u32 n_left_from, *from, *to_next;
117 nat66_in2out_next_t next_index;
118 u32 pkts_processed = 0;
119 u32 thread_index = vm->thread_index;
120 nat66_main_t *nm = &nat66_main;
122 from = vlib_frame_vector_args (frame);
123 n_left_from = frame->n_vectors;
124 next_index = node->cached_next_index;
126 while (n_left_from > 0)
130 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
132 while (n_left_from > 0 && n_left_to_next > 0)
136 u32 next0 = NAT66_IN2OUT_NEXT_IP6_LOOKUP;
138 u16 l4_offset0, frag_offset0;
140 nat66_static_mapping_t *sm0;
141 u32 sw_if_index0, fib_index0;
144 icmp46_header_t *icmp0;
148 /* speculatively enqueue b0 to the current next frame */
156 b0 = vlib_get_buffer (vm, bi0);
157 ip60 = vlib_buffer_get_current (b0);
161 (ip60, b0->current_length, &l4_protocol0, &l4_offset0,
164 next0 = NAT66_IN2OUT_NEXT_DROP;
165 b0->error = node->errors[NAT66_IN2OUT_ERROR_UNKNOWN];
169 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
171 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
174 if (nat66_not_translate (fib_index0, ip60->dst_address))
177 sm0 = nat66_static_mapping_get (&ip60->src_address, fib_index0, 1);
178 if (PREDICT_FALSE (!sm0))
183 if (l4_protocol0 == IP_PROTOCOL_UDP)
185 udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
186 checksum0 = &udp0->checksum;
188 else if (l4_protocol0 == IP_PROTOCOL_TCP)
190 tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
191 checksum0 = &tcp0->checksum;
193 else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
195 icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
196 checksum0 = &icmp0->checksum;
201 csum0 = ip_csum_sub_even (*checksum0, ip60->src_address.as_u64[0]);
202 csum0 = ip_csum_sub_even (csum0, ip60->src_address.as_u64[1]);
203 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[0]);
204 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[1]);
205 *checksum0 = ip_csum_fold (csum0);
208 ip60->src_address.as_u64[0] = sm0->e_addr.as_u64[0];
209 ip60->src_address.as_u64[1] = sm0->e_addr.as_u64[1];
211 vlib_increment_combined_counter (&nm->session_counters,
212 thread_index, sm0 - nm->sm, 1,
213 vlib_buffer_length_in_chain (vm,
217 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
218 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
220 nat66_in2out_trace_t *t =
221 vlib_add_trace (vm, node, b0, sizeof (*t));
222 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
223 t->next_index = next0;
226 pkts_processed += next0 != NAT66_IN2OUT_NEXT_DROP;
228 /* verify speculative enqueue, maybe switch current next frame */
229 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
230 n_left_to_next, bi0, next0);
232 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
235 vlib_node_increment_counter (vm, nat66_in2out_node.index,
236 NAT66_IN2OUT_ERROR_IN2OUT_PACKETS,
238 return frame->n_vectors;
242 VLIB_REGISTER_NODE (nat66_in2out_node) = {
243 .function = nat66_in2out_node_fn,
244 .name = "nat66-in2out",
245 .vector_size = sizeof (u32),
246 .format_trace = format_nat66_in2out_trace,
247 .type = VLIB_NODE_TYPE_INTERNAL,
248 .n_errors = ARRAY_LEN (nat66_in2out_error_strings),
249 .error_strings = nat66_in2out_error_strings,
250 .n_next_nodes = NAT66_IN2OUT_N_NEXT,
251 /* edit / add dispositions here */
253 [NAT66_IN2OUT_NEXT_DROP] = "error-drop",
254 [NAT66_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
259 VLIB_NODE_FUNCTION_MULTIARCH (nat66_in2out_node, nat66_in2out_node_fn);
262 * fd.io coding-style-patch-verification: ON
265 * eval: (c-set-style "gnu")