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 #define foreach_nat66_in2out_error \
45 _(IN2OUT_PACKETS, "good in2out packets processed") \
46 _(NO_TRANSLATION, "no translation") \
51 #define _(sym,str) NAT66_IN2OUT_ERROR_##sym,
52 foreach_nat66_in2out_error
55 } nat66_in2out_error_t;
57 static char *nat66_in2out_error_strings[] = {
58 #define _(sym,string) string,
59 foreach_nat66_in2out_error
65 NAT66_IN2OUT_NEXT_IP6_LOOKUP,
66 NAT66_IN2OUT_NEXT_DROP,
68 } nat66_in2out_next_t;
71 nat66_not_translate (u32 rx_fib_index, ip6_address_t ip6_addr)
73 nat66_main_t *nm = &nat66_main;
76 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
78 .fp_proto = FIB_PROTOCOL_IP6,
85 fei = fib_table_lookup (rx_fib_index, &pfx);
86 if (FIB_NODE_INDEX_INVALID == fei)
88 sw_if_index = fib_entry_get_resolving_interface (fei);
90 if (sw_if_index == ~0)
92 fei = fib_table_lookup (nm->outside_fib_index, &pfx);
93 if (FIB_NODE_INDEX_INVALID == fei)
95 sw_if_index = fib_entry_get_resolving_interface (fei);
99 pool_foreach (i, nm->interfaces,
101 /* NAT packet aimed at outside interface */
102 if (nat_interface_is_outside (i) && sw_if_index == i->sw_if_index)
110 VLIB_NODE_FN (nat66_in2out_node) (vlib_main_t * vm,
111 vlib_node_runtime_t * node,
112 vlib_frame_t * frame)
114 u32 n_left_from, *from, *to_next;
115 nat66_in2out_next_t next_index;
116 u32 pkts_processed = 0;
117 u32 thread_index = vm->thread_index;
118 nat66_main_t *nm = &nat66_main;
120 from = vlib_frame_vector_args (frame);
121 n_left_from = frame->n_vectors;
122 next_index = node->cached_next_index;
124 while (n_left_from > 0)
128 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
130 while (n_left_from > 0 && n_left_to_next > 0)
134 u32 next0 = NAT66_IN2OUT_NEXT_IP6_LOOKUP;
136 u16 l4_offset0, frag_offset0;
138 nat66_static_mapping_t *sm0;
139 u32 sw_if_index0, fib_index0;
142 icmp46_header_t *icmp0;
146 /* speculatively enqueue b0 to the current next frame */
154 b0 = vlib_get_buffer (vm, bi0);
155 ip60 = vlib_buffer_get_current (b0);
159 (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
162 next0 = NAT66_IN2OUT_NEXT_DROP;
163 b0->error = node->errors[NAT66_IN2OUT_ERROR_UNKNOWN];
167 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
169 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
172 if (nat66_not_translate (fib_index0, ip60->dst_address))
175 sm0 = nat66_static_mapping_get (&ip60->src_address, fib_index0, 1);
176 if (PREDICT_FALSE (!sm0))
181 if (l4_protocol0 == IP_PROTOCOL_UDP)
183 udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
184 checksum0 = &udp0->checksum;
186 else if (l4_protocol0 == IP_PROTOCOL_TCP)
188 tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
189 checksum0 = &tcp0->checksum;
191 else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
193 icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
194 checksum0 = &icmp0->checksum;
199 csum0 = ip_csum_sub_even (*checksum0, ip60->src_address.as_u64[0]);
200 csum0 = ip_csum_sub_even (csum0, ip60->src_address.as_u64[1]);
201 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[0]);
202 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[1]);
203 *checksum0 = ip_csum_fold (csum0);
206 ip60->src_address.as_u64[0] = sm0->e_addr.as_u64[0];
207 ip60->src_address.as_u64[1] = sm0->e_addr.as_u64[1];
209 vlib_increment_combined_counter (&nm->session_counters,
210 thread_index, sm0 - nm->sm, 1,
211 vlib_buffer_length_in_chain (vm,
215 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
216 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
218 nat66_in2out_trace_t *t =
219 vlib_add_trace (vm, node, b0, sizeof (*t));
220 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
221 t->next_index = next0;
224 pkts_processed += next0 != NAT66_IN2OUT_NEXT_DROP;
226 /* verify speculative enqueue, maybe switch current next frame */
227 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
228 n_left_to_next, bi0, next0);
230 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
233 vlib_node_increment_counter (vm, nm->in2out_node_index,
234 NAT66_IN2OUT_ERROR_IN2OUT_PACKETS,
236 return frame->n_vectors;
240 VLIB_REGISTER_NODE (nat66_in2out_node) = {
241 .name = "nat66-in2out",
242 .vector_size = sizeof (u32),
243 .format_trace = format_nat66_in2out_trace,
244 .type = VLIB_NODE_TYPE_INTERNAL,
245 .n_errors = ARRAY_LEN (nat66_in2out_error_strings),
246 .error_strings = nat66_in2out_error_strings,
247 .n_next_nodes = NAT66_IN2OUT_N_NEXT,
248 /* edit / add dispositions here */
250 [NAT66_IN2OUT_NEXT_DROP] = "error-drop",
251 [NAT66_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
257 * fd.io coding-style-patch-verification: ON
260 * eval: (c-set-style "gnu")