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/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 _(NO_TRANSLATION, "no translation") \
50 #define _(sym,str) NAT66_IN2OUT_ERROR_##sym,
51 foreach_nat66_in2out_error
54 } nat66_in2out_error_t;
56 static char *nat66_in2out_error_strings[] = {
57 #define _(sym,string) string,
58 foreach_nat66_in2out_error
64 NAT66_IN2OUT_NEXT_IP6_LOOKUP,
65 NAT66_IN2OUT_NEXT_DROP,
67 } nat66_in2out_next_t;
70 nat66_not_translate (u32 rx_fib_index, ip6_address_t ip6_addr)
72 nat66_main_t *nm = &nat66_main;
75 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
77 .fp_proto = FIB_PROTOCOL_IP6,
84 fei = fib_table_lookup (rx_fib_index, &pfx);
85 if (FIB_NODE_INDEX_INVALID == fei)
87 sw_if_index = fib_entry_get_resolving_interface (fei);
89 if (sw_if_index == ~0)
91 fei = fib_table_lookup (nm->outside_fib_index, &pfx);
92 if (FIB_NODE_INDEX_INVALID == fei)
94 sw_if_index = fib_entry_get_resolving_interface (fei);
98 pool_foreach (i, nm->interfaces)
100 /* NAT packet aimed at outside interface */
101 if (nat66_interface_is_outside (i) && sw_if_index == i->sw_if_index)
109 VLIB_NODE_FN (nat66_in2out_node) (vlib_main_t * vm,
110 vlib_node_runtime_t * node,
111 vlib_frame_t * frame)
113 u32 n_left_from, *from, *to_next;
114 nat66_in2out_next_t next_index;
115 u32 thread_index = vm->thread_index;
116 nat66_main_t *nm = &nat66_main;
118 from = vlib_frame_vector_args (frame);
119 n_left_from = frame->n_vectors;
120 next_index = node->cached_next_index;
122 while (n_left_from > 0)
126 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
128 while (n_left_from > 0 && n_left_to_next > 0)
132 u32 next0 = NAT66_IN2OUT_NEXT_IP6_LOOKUP;
134 u16 l4_offset0, frag_offset0;
136 nat66_static_mapping_t *sm0;
137 u32 sw_if_index0, fib_index0;
140 icmp46_header_t *icmp0;
144 /* speculatively enqueue b0 to the current next frame */
152 b0 = vlib_get_buffer (vm, bi0);
153 ip60 = vlib_buffer_get_current (b0);
157 (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
160 next0 = NAT66_IN2OUT_NEXT_DROP;
161 b0->error = node->errors[NAT66_IN2OUT_ERROR_UNKNOWN];
165 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
167 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
170 if (nat66_not_translate (fib_index0, ip60->dst_address))
173 sm0 = nat66_static_mapping_get (&ip60->src_address, fib_index0, 1);
174 if (PREDICT_FALSE (!sm0))
179 if (l4_protocol0 == IP_PROTOCOL_UDP)
181 udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
182 checksum0 = &udp0->checksum;
184 else if (l4_protocol0 == IP_PROTOCOL_TCP)
186 tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
187 checksum0 = &tcp0->checksum;
189 else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
191 icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
192 checksum0 = &icmp0->checksum;
197 csum0 = ip_csum_sub_even (*checksum0, ip60->src_address.as_u64[0]);
198 csum0 = ip_csum_sub_even (csum0, ip60->src_address.as_u64[1]);
199 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[0]);
200 csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[1]);
201 *checksum0 = ip_csum_fold (csum0);
204 ip60->src_address.as_u64[0] = sm0->e_addr.as_u64[0];
205 ip60->src_address.as_u64[1] = sm0->e_addr.as_u64[1];
207 vlib_increment_combined_counter (&nm->session_counters,
208 thread_index, sm0 - nm->sm, 1,
209 vlib_buffer_length_in_chain (vm,
213 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
214 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
216 nat66_in2out_trace_t *t =
217 vlib_add_trace (vm, node, b0, sizeof (*t));
218 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
219 t->next_index = next0;
222 if (next0 != NAT66_IN2OUT_NEXT_DROP)
224 vlib_increment_simple_counter (&nm->in2out_packets,
225 thread_index, sw_if_index0, 1);
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 return frame->n_vectors;
239 VLIB_REGISTER_NODE (nat66_in2out_node) = {
240 .name = "nat66-in2out",
241 .vector_size = sizeof (u32),
242 .format_trace = format_nat66_in2out_trace,
243 .type = VLIB_NODE_TYPE_INTERNAL,
244 .n_errors = ARRAY_LEN (nat66_in2out_error_strings),
245 .error_strings = nat66_in2out_error_strings,
246 .n_next_nodes = NAT66_IN2OUT_N_NEXT,
247 /* edit / add dispositions here */
249 [NAT66_IN2OUT_NEXT_DROP] = "error-drop",
250 [NAT66_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
256 * fd.io coding-style-patch-verification: ON
259 * eval: (c-set-style "gnu")