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>
17 vlib_node_registration_t dslite_out2in_node;
21 DSLITE_OUT2IN_NEXT_IP4_LOOKUP,
22 DSLITE_OUT2IN_NEXT_IP6_LOOKUP,
23 DSLITE_OUT2IN_NEXT_DROP,
25 } dslite_out2in_next_t;
27 static char *dslite_out2in_error_strings[] = {
28 #define _(sym,string) string,
34 dslite_icmp_out2in (dslite_main_t * dm, ip4_header_t * ip4,
35 dslite_session_t ** sp, u32 next, u8 * error,
38 dslite_session_t *s = 0;
39 icmp46_header_t *icmp = ip4_next_header (ip4);
40 clib_bihash_kv_8_8_t kv, value;
41 snat_session_key_t key;
43 icmp_echo_header_t *echo;
44 u32 new_addr, old_addr;
48 echo = (icmp_echo_header_t *) (icmp + 1);
50 if (icmp_is_error_message (icmp) || (icmp->type != ICMP4_echo_reply))
52 n = DSLITE_OUT2IN_NEXT_DROP;
53 *error = DSLITE_ERROR_BAD_ICMP_TYPE;
57 key.addr = ip4->dst_address;
58 key.port = echo->identifier;
59 key.protocol = SNAT_PROTOCOL_ICMP;
63 if (clib_bihash_search_8_8
64 (&dm->per_thread_data[thread_index].out2in, &kv, &value))
66 next = DSLITE_OUT2IN_NEXT_DROP;
67 *error = DSLITE_ERROR_NO_TRANSLATION;
73 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
77 old_id = echo->identifier;
78 echo->identifier = new_id = s->in2out.port;
80 sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
81 icmp->checksum = ip_csum_fold (sum);
83 old_addr = ip4->dst_address.as_u32;
84 ip4->dst_address = s->in2out.addr;
85 new_addr = ip4->dst_address.as_u32;
88 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
89 ip4->checksum = ip_csum_fold (sum);
97 dslite_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
100 u32 n_left_from, *from, *to_next;
101 dslite_out2in_next_t next_index;
102 vlib_node_runtime_t *error_node;
103 u32 thread_index = vlib_get_thread_index ();
104 f64 now = vlib_time_now (vm);
105 dslite_main_t *dm = &dslite_main;
107 error_node = vlib_node_get_runtime (vm, dslite_out2in_node.index);
109 from = vlib_frame_vector_args (frame);
110 n_left_from = frame->n_vectors;
111 next_index = node->cached_next_index;
114 while (n_left_from > 0)
118 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
120 while (n_left_from > 0 && n_left_to_next > 0)
124 u32 next0 = DSLITE_OUT2IN_NEXT_IP6_LOOKUP;
125 u8 error0 = DSLITE_ERROR_OUT2IN;
131 clib_bihash_kv_8_8_t kv0, value0;
132 snat_session_key_t key0;
133 dslite_session_t *s0 = 0;
135 u32 new_addr0, old_addr0;
136 u16 new_port0, old_port0;
138 /* speculatively enqueue b0 to the current next frame */
146 b0 = vlib_get_buffer (vm, bi0);
147 ip40 = vlib_buffer_get_current (b0);
148 proto0 = ip_proto_to_snat_proto (ip40->protocol);
150 if (PREDICT_FALSE (proto0 == ~0))
152 error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
153 next0 = DSLITE_OUT2IN_NEXT_DROP;
157 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
160 dslite_icmp_out2in (dm, ip40, &s0, next0, &error0,
162 if (PREDICT_FALSE (next0 == DSLITE_OUT2IN_NEXT_DROP))
168 udp0 = ip4_next_header (ip40);
169 tcp0 = (tcp_header_t *) udp0;
171 key0.addr = ip40->dst_address;
172 key0.port = udp0->dst_port;
173 key0.protocol = proto0;
175 kv0.key = key0.as_u64;
177 if (clib_bihash_search_8_8
178 (&dm->per_thread_data[thread_index].out2in, &kv0, &value0))
180 next0 = DSLITE_OUT2IN_NEXT_DROP;
181 error0 = DSLITE_ERROR_NO_TRANSLATION;
187 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
191 old_addr0 = ip40->dst_address.as_u32;
192 ip40->dst_address = s0->in2out.addr;
193 new_addr0 = ip40->dst_address.as_u32;
195 sum0 = ip40->checksum;
197 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
199 ip40->checksum = ip_csum_fold (sum0);
201 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
203 old_port0 = tcp0->dst_port;
204 tcp0->dst_port = s0->in2out.port;
205 new_port0 = tcp0->dst_port;
207 sum0 = tcp0->checksum;
209 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
212 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
214 tcp0->checksum = ip_csum_fold (sum0);
218 old_port0 = udp0->dst_port;
219 udp0->dst_port = s0->in2out.port;
224 /* Construct IPv6 header */
225 vlib_buffer_advance (b0, -(sizeof (ip6_header_t)));
226 ip60 = vlib_buffer_get_current (b0);
227 ip60->ip_version_traffic_class_and_flow_label =
228 clib_host_to_net_u32 ((6 << 28) + (ip40->tos << 20));
229 ip60->payload_length = ip40->length;
230 ip60->protocol = IP_PROTOCOL_IP_IN_IP;
231 ip60->hop_limit = ip40->ttl;
232 ip60->src_address.as_u64[0] = dm->aftr_ip6_addr.as_u64[0];
233 ip60->src_address.as_u64[1] = dm->aftr_ip6_addr.as_u64[1];
234 ip60->dst_address.as_u64[0] = s0->in2out.softwire_id.as_u64[0];
235 ip60->dst_address.as_u64[1] = s0->in2out.softwire_id.as_u64[1];
238 s0->last_heard = now;
240 s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
241 /* Per-B4 LRU list maintenance */
242 clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
244 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
245 s0->per_b4_list_head_index, s0->per_b4_index);
247 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
248 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
250 dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
251 t->next_index = next0;
252 t->session_index = ~0;
255 s0 - dm->per_thread_data[thread_index].sessions;
258 b0->error = error_node->errors[error0];
260 /* verify speculative enqueue, maybe switch current next frame */
261 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
262 n_left_to_next, bi0, next0);
264 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
267 return frame->n_vectors;
271 VLIB_REGISTER_NODE (dslite_out2in_node) = {
272 .function = dslite_out2in_node_fn,
273 .name = "dslite-out2in",
274 .vector_size = sizeof (u32),
275 .format_trace = format_dslite_trace,
276 .type = VLIB_NODE_TYPE_INTERNAL,
277 .n_errors = ARRAY_LEN (dslite_out2in_error_strings),
278 .error_strings = dslite_out2in_error_strings,
279 .n_next_nodes = DSLITE_OUT2IN_N_NEXT,
280 /* edit / add dispositions here */
282 [DSLITE_OUT2IN_NEXT_DROP] = "error-drop",
283 [DSLITE_OUT2IN_NEXT_IP4_LOOKUP] = "ip4-lookup",
284 [DSLITE_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
289 VLIB_NODE_FUNCTION_MULTIARCH (dslite_out2in_node, dslite_out2in_node_fn);
292 * fd.io coding-style-patch-verification: ON
295 * eval: (c-set-style "gnu")