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>
18 vlib_node_registration_t dslite_out2in_node;
22 DSLITE_OUT2IN_NEXT_IP4_LOOKUP,
23 DSLITE_OUT2IN_NEXT_IP6_LOOKUP,
24 DSLITE_OUT2IN_NEXT_DROP,
26 } dslite_out2in_next_t;
28 static char *dslite_out2in_error_strings[] = {
29 #define _(sym,string) string,
35 dslite_icmp_out2in (dslite_main_t * dm, ip4_header_t * ip4,
36 dslite_session_t ** sp, u32 next, u8 * error,
39 dslite_session_t *s = 0;
40 icmp46_header_t *icmp = ip4_next_header (ip4);
41 clib_bihash_kv_8_8_t kv, value;
42 snat_session_key_t key;
44 icmp_echo_header_t *echo;
45 u32 new_addr, old_addr;
49 echo = (icmp_echo_header_t *) (icmp + 1);
51 if (icmp_is_error_message (icmp) || (icmp->type != ICMP4_echo_reply))
53 n = DSLITE_OUT2IN_NEXT_DROP;
54 *error = DSLITE_ERROR_BAD_ICMP_TYPE;
58 key.addr = ip4->dst_address;
59 key.port = echo->identifier;
60 key.protocol = SNAT_PROTOCOL_ICMP;
64 if (clib_bihash_search_8_8
65 (&dm->per_thread_data[thread_index].out2in, &kv, &value))
67 next = DSLITE_OUT2IN_NEXT_DROP;
68 *error = DSLITE_ERROR_NO_TRANSLATION;
74 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
78 old_id = echo->identifier;
79 echo->identifier = new_id = s->in2out.port;
81 sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
82 icmp->checksum = ip_csum_fold (sum);
84 old_addr = ip4->dst_address.as_u32;
85 ip4->dst_address = s->in2out.addr;
86 new_addr = ip4->dst_address.as_u32;
89 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
90 ip4->checksum = ip_csum_fold (sum);
98 dslite_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
101 u32 n_left_from, *from, *to_next;
102 dslite_out2in_next_t next_index;
103 vlib_node_runtime_t *error_node;
104 u32 thread_index = vlib_get_thread_index ();
105 f64 now = vlib_time_now (vm);
106 dslite_main_t *dm = &dslite_main;
108 error_node = vlib_node_get_runtime (vm, dslite_out2in_node.index);
110 from = vlib_frame_vector_args (frame);
111 n_left_from = frame->n_vectors;
112 next_index = node->cached_next_index;
115 while (n_left_from > 0)
119 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
121 while (n_left_from > 0 && n_left_to_next > 0)
125 u32 next0 = DSLITE_OUT2IN_NEXT_IP6_LOOKUP;
126 u8 error0 = DSLITE_ERROR_OUT2IN;
132 clib_bihash_kv_8_8_t kv0, value0;
133 snat_session_key_t key0;
134 dslite_session_t *s0 = 0;
136 u32 new_addr0, old_addr0;
137 u16 new_port0, old_port0;
139 /* speculatively enqueue b0 to the current next frame */
147 b0 = vlib_get_buffer (vm, bi0);
148 ip40 = vlib_buffer_get_current (b0);
149 proto0 = ip_proto_to_snat_proto (ip40->protocol);
151 if (PREDICT_FALSE (proto0 == ~0))
153 error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
154 next0 = DSLITE_OUT2IN_NEXT_DROP;
158 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
161 dslite_icmp_out2in (dm, ip40, &s0, next0, &error0,
163 if (PREDICT_FALSE (next0 == DSLITE_OUT2IN_NEXT_DROP))
169 udp0 = ip4_next_header (ip40);
170 tcp0 = (tcp_header_t *) udp0;
172 key0.addr = ip40->dst_address;
173 key0.port = udp0->dst_port;
174 key0.protocol = proto0;
176 kv0.key = key0.as_u64;
178 if (clib_bihash_search_8_8
179 (&dm->per_thread_data[thread_index].out2in, &kv0, &value0))
181 next0 = DSLITE_OUT2IN_NEXT_DROP;
182 error0 = DSLITE_ERROR_NO_TRANSLATION;
188 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
192 old_addr0 = ip40->dst_address.as_u32;
193 ip40->dst_address = s0->in2out.addr;
194 new_addr0 = ip40->dst_address.as_u32;
196 sum0 = ip40->checksum;
198 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
200 ip40->checksum = ip_csum_fold (sum0);
202 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
204 old_port0 = tcp0->dst_port;
205 tcp0->dst_port = s0->in2out.port;
206 new_port0 = tcp0->dst_port;
208 sum0 = tcp0->checksum;
210 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
213 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
215 tcp0->checksum = ip_csum_fold (sum0);
219 old_port0 = udp0->dst_port;
220 udp0->dst_port = s0->in2out.port;
225 /* Construct IPv6 header */
226 vlib_buffer_advance (b0, -(sizeof (ip6_header_t)));
227 ip60 = vlib_buffer_get_current (b0);
228 ip60->ip_version_traffic_class_and_flow_label =
229 clib_host_to_net_u32 ((6 << 28) + (ip40->tos << 20));
230 ip60->payload_length = ip40->length;
231 ip60->protocol = IP_PROTOCOL_IP_IN_IP;
232 ip60->hop_limit = ip40->ttl;
233 ip60->src_address.as_u64[0] = dm->aftr_ip6_addr.as_u64[0];
234 ip60->src_address.as_u64[1] = dm->aftr_ip6_addr.as_u64[1];
235 ip60->dst_address.as_u64[0] = s0->in2out.softwire_id.as_u64[0];
236 ip60->dst_address.as_u64[1] = s0->in2out.softwire_id.as_u64[1];
239 s0->last_heard = now;
241 s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
242 /* Per-B4 LRU list maintenance */
243 clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
245 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
246 s0->per_b4_list_head_index, s0->per_b4_index);
248 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
249 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
251 dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
252 t->next_index = next0;
253 t->session_index = ~0;
256 s0 - dm->per_thread_data[thread_index].sessions;
259 b0->error = error_node->errors[error0];
261 /* verify speculative enqueue, maybe switch current next frame */
262 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
263 n_left_to_next, bi0, next0);
265 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
268 return frame->n_vectors;
272 VLIB_REGISTER_NODE (dslite_out2in_node) = {
273 .function = dslite_out2in_node_fn,
274 .name = "dslite-out2in",
275 .vector_size = sizeof (u32),
276 .format_trace = format_dslite_trace,
277 .type = VLIB_NODE_TYPE_INTERNAL,
278 .n_errors = ARRAY_LEN (dslite_out2in_error_strings),
279 .error_strings = dslite_out2in_error_strings,
280 .n_next_nodes = DSLITE_OUT2IN_N_NEXT,
281 /* edit / add dispositions here */
283 [DSLITE_OUT2IN_NEXT_DROP] = "error-drop",
284 [DSLITE_OUT2IN_NEXT_IP4_LOOKUP] = "ip4-lookup",
285 [DSLITE_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
290 VLIB_NODE_FUNCTION_MULTIARCH (dslite_out2in_node, dslite_out2in_node_fn);
293 * fd.io coding-style-patch-verification: ON
296 * eval: (c-set-style "gnu")