2 * Copyright (c) 2017 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.
15 #include <nat/dslite.h>
16 #include <nat/nat_inlines.h>
20 DSLITE_OUT2IN_NEXT_IP4_LOOKUP,
21 DSLITE_OUT2IN_NEXT_IP6_LOOKUP,
22 DSLITE_OUT2IN_NEXT_DROP,
24 } dslite_out2in_next_t;
26 static char *dslite_out2in_error_strings[] = {
27 #define _(sym,string) string,
33 dslite_icmp_out2in (dslite_main_t * dm, ip4_header_t * ip4,
34 dslite_session_t ** sp, u32 next, u8 * error,
37 dslite_session_t *s = 0;
38 icmp46_header_t *icmp = ip4_next_header (ip4);
39 clib_bihash_kv_8_8_t kv, value;
40 snat_session_key_t key;
42 icmp_echo_header_t *echo;
43 u32 new_addr, old_addr;
47 echo = (icmp_echo_header_t *) (icmp + 1);
49 if (icmp_is_error_message (icmp) || (icmp->type != ICMP4_echo_reply))
51 n = DSLITE_OUT2IN_NEXT_DROP;
52 *error = DSLITE_ERROR_BAD_ICMP_TYPE;
56 key.addr = ip4->dst_address;
57 key.port = echo->identifier;
58 key.protocol = SNAT_PROTOCOL_ICMP;
62 if (clib_bihash_search_8_8
63 (&dm->per_thread_data[thread_index].out2in, &kv, &value))
65 next = DSLITE_OUT2IN_NEXT_DROP;
66 *error = DSLITE_ERROR_NO_TRANSLATION;
72 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
76 old_id = echo->identifier;
77 echo->identifier = new_id = s->in2out.port;
79 sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
80 icmp->checksum = ip_csum_fold (sum);
82 old_addr = ip4->dst_address.as_u32;
83 ip4->dst_address = s->in2out.addr;
84 new_addr = ip4->dst_address.as_u32;
87 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
88 ip4->checksum = ip_csum_fold (sum);
95 VLIB_NODE_FN (dslite_out2in_node) (vlib_main_t * vm,
96 vlib_node_runtime_t * node,
99 u32 n_left_from, *from, *to_next;
100 dslite_out2in_next_t next_index;
101 vlib_node_runtime_t *error_node;
102 u32 thread_index = vm->thread_index;
103 f64 now = vlib_time_now (vm);
104 dslite_main_t *dm = &dslite_main;
106 error_node = vlib_node_get_runtime (vm, dm->dslite_out2in_node_index);
108 from = vlib_frame_vector_args (frame);
109 n_left_from = frame->n_vectors;
110 next_index = node->cached_next_index;
113 while (n_left_from > 0)
117 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
119 while (n_left_from > 0 && n_left_to_next > 0)
123 u32 next0 = DSLITE_OUT2IN_NEXT_IP6_LOOKUP;
124 u8 error0 = DSLITE_ERROR_OUT2IN;
130 clib_bihash_kv_8_8_t kv0, value0;
131 snat_session_key_t key0;
132 dslite_session_t *s0 = 0;
134 u32 new_addr0, old_addr0;
135 u16 new_port0, old_port0;
137 /* speculatively enqueue b0 to the current next frame */
145 b0 = vlib_get_buffer (vm, bi0);
146 ip40 = vlib_buffer_get_current (b0);
147 proto0 = ip_proto_to_snat_proto (ip40->protocol);
149 if (PREDICT_FALSE (proto0 == ~0))
151 error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
152 next0 = DSLITE_OUT2IN_NEXT_DROP;
156 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
159 dslite_icmp_out2in (dm, ip40, &s0, next0, &error0,
161 if (PREDICT_FALSE (next0 == DSLITE_OUT2IN_NEXT_DROP))
167 udp0 = ip4_next_header (ip40);
168 tcp0 = (tcp_header_t *) udp0;
170 key0.addr = ip40->dst_address;
171 key0.port = udp0->dst_port;
172 key0.protocol = proto0;
174 kv0.key = key0.as_u64;
176 if (clib_bihash_search_8_8
177 (&dm->per_thread_data[thread_index].out2in, &kv0, &value0))
179 next0 = DSLITE_OUT2IN_NEXT_DROP;
180 error0 = DSLITE_ERROR_NO_TRANSLATION;
186 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
190 old_addr0 = ip40->dst_address.as_u32;
191 ip40->dst_address = s0->in2out.addr;
192 new_addr0 = ip40->dst_address.as_u32;
194 sum0 = ip40->checksum;
196 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
198 ip40->checksum = ip_csum_fold (sum0);
200 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
202 old_port0 = tcp0->dst_port;
203 tcp0->dst_port = s0->in2out.port;
204 new_port0 = tcp0->dst_port;
206 sum0 = tcp0->checksum;
208 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
211 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
213 tcp0->checksum = ip_csum_fold (sum0);
217 old_port0 = udp0->dst_port;
218 udp0->dst_port = s0->in2out.port;
223 /* Construct IPv6 header */
224 vlib_buffer_advance (b0, -(sizeof (ip6_header_t)));
225 ip60 = vlib_buffer_get_current (b0);
226 ip60->ip_version_traffic_class_and_flow_label =
227 clib_host_to_net_u32 ((6 << 28) + (ip40->tos << 20));
228 ip60->payload_length = ip40->length;
229 ip60->protocol = IP_PROTOCOL_IP_IN_IP;
230 ip60->hop_limit = ip40->ttl;
231 ip60->src_address.as_u64[0] = dm->aftr_ip6_addr.as_u64[0];
232 ip60->src_address.as_u64[1] = dm->aftr_ip6_addr.as_u64[1];
233 ip60->dst_address.as_u64[0] = s0->in2out.softwire_id.as_u64[0];
234 ip60->dst_address.as_u64[1] = s0->in2out.softwire_id.as_u64[1];
237 s0->last_heard = now;
239 s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
240 /* Per-B4 LRU list maintenance */
241 clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
243 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
244 s0->per_b4_list_head_index, s0->per_b4_index);
246 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
247 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
249 dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
250 t->next_index = next0;
251 t->session_index = ~0;
254 s0 - dm->per_thread_data[thread_index].sessions;
257 b0->error = error_node->errors[error0];
259 /* verify speculative enqueue, maybe switch current next frame */
260 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
261 n_left_to_next, bi0, next0);
263 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
266 return frame->n_vectors;
270 VLIB_REGISTER_NODE (dslite_out2in_node) = {
271 .name = "dslite-out2in",
272 .vector_size = sizeof (u32),
273 .format_trace = format_dslite_trace,
274 .type = VLIB_NODE_TYPE_INTERNAL,
275 .n_errors = ARRAY_LEN (dslite_out2in_error_strings),
276 .error_strings = dslite_out2in_error_strings,
277 .n_next_nodes = DSLITE_OUT2IN_N_NEXT,
278 /* edit / add dispositions here */
280 [DSLITE_OUT2IN_NEXT_DROP] = "error-drop",
281 [DSLITE_OUT2IN_NEXT_IP4_LOOKUP] = "ip4-lookup",
282 [DSLITE_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
288 * fd.io coding-style-patch-verification: ON
291 * eval: (c-set-style "gnu")