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 outside to inside network translation
20 #include <nat/nat66.h>
21 #include <vnet/ip/ip6_to_ip4.h>
22 #include <vnet/fib/fib_table.h>
28 } nat66_out2in_trace_t;
31 format_nat66_out2in_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_out2in_trace_t *t = va_arg (*args, nat66_out2in_trace_t *);
38 format (s, "NAT66-out2in: sw_if_index %d, next index %d", t->sw_if_index,
44 #define foreach_nat66_out2in_error \
45 _(OUT2IN_PACKETS, "good out2in packets processed") \
46 _(NO_TRANSLATION, "no translation") \
51 #define _(sym,str) NAT66_OUT2IN_ERROR_##sym,
52 foreach_nat66_out2in_error
55 } nat66_out2in_error_t;
57 static char *nat66_out2in_error_strings[] = {
58 #define _(sym,string) string,
59 foreach_nat66_out2in_error
65 NAT66_OUT2IN_NEXT_IP6_LOOKUP,
66 NAT66_OUT2IN_NEXT_DROP,
68 } nat66_out2in_next_t;
70 VLIB_NODE_FN (nat66_out2in_node) (vlib_main_t * vm,
71 vlib_node_runtime_t * node,
74 u32 n_left_from, *from, *to_next;
75 nat66_out2in_next_t next_index;
76 u32 pkts_processed = 0;
77 u32 thread_index = vm->thread_index;
78 nat66_main_t *nm = &nat66_main;
80 from = vlib_frame_vector_args (frame);
81 n_left_from = frame->n_vectors;
82 next_index = node->cached_next_index;
84 while (n_left_from > 0)
88 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
90 while (n_left_from > 0 && n_left_to_next > 0)
94 u32 next0 = NAT66_OUT2IN_NEXT_IP6_LOOKUP;
96 u16 l4_offset0, frag_offset0;
98 nat66_static_mapping_t *sm0;
99 u32 sw_if_index0, fib_index0;
102 icmp46_header_t *icmp0;
106 /* speculatively enqueue b0 to the current next frame */
114 b0 = vlib_get_buffer (vm, bi0);
115 ip60 = vlib_buffer_get_current (b0);
119 (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
122 next0 = NAT66_OUT2IN_NEXT_DROP;
123 b0->error = node->errors[NAT66_OUT2IN_ERROR_UNKNOWN];
127 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
129 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
132 sm0 = nat66_static_mapping_get (&ip60->dst_address, fib_index0, 0);
133 if (PREDICT_FALSE (!sm0))
138 if (l4_protocol0 == IP_PROTOCOL_UDP)
140 udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
141 checksum0 = &udp0->checksum;
143 else if (l4_protocol0 == IP_PROTOCOL_TCP)
145 tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
146 checksum0 = &tcp0->checksum;
148 else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
150 icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
151 checksum0 = &icmp0->checksum;
156 csum0 = ip_csum_sub_even (*checksum0, ip60->dst_address.as_u64[0]);
157 csum0 = ip_csum_sub_even (csum0, ip60->dst_address.as_u64[1]);
158 csum0 = ip_csum_add_even (csum0, sm0->l_addr.as_u64[0]);
159 csum0 = ip_csum_add_even (csum0, sm0->l_addr.as_u64[1]);
160 *checksum0 = ip_csum_fold (csum0);
163 ip60->dst_address.as_u64[0] = sm0->l_addr.as_u64[0];
164 ip60->dst_address.as_u64[1] = sm0->l_addr.as_u64[1];
165 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0->fib_index;
167 vlib_increment_combined_counter (&nm->session_counters,
168 thread_index, sm0 - nm->sm, 1,
169 vlib_buffer_length_in_chain (vm,
173 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
174 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
176 nat66_out2in_trace_t *t =
177 vlib_add_trace (vm, node, b0, sizeof (*t));
178 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
179 t->next_index = next0;
182 pkts_processed += next0 != NAT66_OUT2IN_NEXT_DROP;
184 /* verify speculative enqueue, maybe switch current next frame */
185 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
186 n_left_to_next, bi0, next0);
188 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
191 vlib_node_increment_counter (vm, nm->out2in_node_index,
192 NAT66_OUT2IN_ERROR_OUT2IN_PACKETS,
194 return frame->n_vectors;
198 VLIB_REGISTER_NODE (nat66_out2in_node) = {
199 .name = "nat66-out2in",
200 .vector_size = sizeof (u32),
201 .format_trace = format_nat66_out2in_trace,
202 .type = VLIB_NODE_TYPE_INTERNAL,
203 .n_errors = ARRAY_LEN (nat66_out2in_error_strings),
204 .error_strings = nat66_out2in_error_strings,
205 .n_next_nodes = NAT66_OUT2IN_N_NEXT,
206 /* edit / add dispositions here */
208 [NAT66_OUT2IN_NEXT_DROP] = "error-drop",
209 [NAT66_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
215 * fd.io coding-style-patch-verification: ON
218 * eval: (c-set-style "gnu")