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>
17 #include <nat/nat_syslog.h>
19 vlib_node_registration_t dslite_in2out_node;
20 vlib_node_registration_t dslite_in2out_slowpath_node;
24 DSLITE_IN2OUT_NEXT_IP4_LOOKUP,
25 DSLITE_IN2OUT_NEXT_IP6_ICMP,
26 DSLITE_IN2OUT_NEXT_DROP,
27 DSLITE_IN2OUT_NEXT_SLOWPATH,
29 } dslite_in2out_next_t;
31 static char *dslite_in2out_error_strings[] = {
32 #define _(sym,string) string,
38 slow_path (dslite_main_t * dm, dslite_session_key_t * in2out_key,
39 dslite_session_t ** sp, u32 next, u8 * error, u32 thread_index)
42 clib_bihash_kv_16_8_t b4_kv, b4_value;
43 clib_bihash_kv_24_8_t in2out_kv;
44 clib_bihash_kv_8_8_t out2in_kv;
45 dlist_elt_t *head_elt, *oldest_elt, *elt;
48 snat_session_key_t out2in_key;
51 out2in_key.protocol = in2out_key->proto;
52 out2in_key.fib_index = 0;
54 b4_kv.key[0] = in2out_key->softwire_id.as_u64[0];
55 b4_kv.key[1] = in2out_key->softwire_id.as_u64[1];
57 if (clib_bihash_search_16_8
58 (&dm->per_thread_data[thread_index].b4_hash, &b4_kv, &b4_value))
60 pool_get (dm->per_thread_data[thread_index].b4s, b4);
61 clib_memset (b4, 0, sizeof (*b4));
62 b4->addr.as_u64[0] = in2out_key->softwire_id.as_u64[0];
63 b4->addr.as_u64[1] = in2out_key->softwire_id.as_u64[1];
65 pool_get (dm->per_thread_data[thread_index].list_pool, head_elt);
66 b4->sessions_per_b4_list_head_index =
67 head_elt - dm->per_thread_data[thread_index].list_pool;
68 clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
69 b4->sessions_per_b4_list_head_index);
71 b4_index = b4_kv.value = b4 - dm->per_thread_data[thread_index].b4s;
72 clib_bihash_add_del_16_8 (&dm->per_thread_data[thread_index].b4_hash,
77 b4_index = b4_value.value;
79 pool_elt_at_index (dm->per_thread_data[thread_index].b4s,
83 //TODO configurable quota
84 if (b4->nsessions >= 1000)
87 clib_dlist_remove_head (dm->per_thread_data[thread_index].list_pool,
88 b4->sessions_per_b4_list_head_index);
89 ASSERT (oldest_index != ~0);
90 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
91 b4->sessions_per_b4_list_head_index, oldest_index);
93 pool_elt_at_index (dm->per_thread_data[thread_index].list_pool,
96 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
99 in2out_kv.key[0] = s->in2out.as_u64[0];
100 in2out_kv.key[1] = s->in2out.as_u64[1];
101 in2out_kv.key[2] = s->in2out.as_u64[2];
102 clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
104 out2in_kv.key = s->out2in.as_u64;
105 clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
107 snat_free_outside_address_and_port (dm->addr_pool, thread_index,
110 nat_syslog_dslite_apmdel (b4_index, &s->in2out.softwire_id,
111 &s->in2out.addr, s->in2out.port,
112 &s->out2in.addr, s->out2in.port,
115 if (snat_alloc_outside_address_and_port
116 (dm->addr_pool, 0, thread_index, &out2in_key,
117 dm->port_per_thread, thread_index))
122 if (snat_alloc_outside_address_and_port
123 (dm->addr_pool, 0, thread_index, &out2in_key,
124 dm->port_per_thread, thread_index))
126 *error = DSLITE_ERROR_OUT_OF_PORTS;
127 return DSLITE_IN2OUT_NEXT_DROP;
129 pool_get (dm->per_thread_data[thread_index].sessions, s);
130 clib_memset (s, 0, sizeof (*s));
133 pool_get (dm->per_thread_data[thread_index].list_pool, elt);
134 clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
135 elt - dm->per_thread_data[thread_index].list_pool);
136 elt->value = s - dm->per_thread_data[thread_index].sessions;
137 s->per_b4_index = elt - dm->per_thread_data[thread_index].list_pool;
138 s->per_b4_list_head_index = b4->sessions_per_b4_list_head_index;
139 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
140 s->per_b4_list_head_index,
141 elt - dm->per_thread_data[thread_index].list_pool);
144 s->in2out = *in2out_key;
145 s->out2in = out2in_key;
147 in2out_kv.key[0] = s->in2out.as_u64[0];
148 in2out_kv.key[1] = s->in2out.as_u64[1];
149 in2out_kv.key[2] = s->in2out.as_u64[2];
150 in2out_kv.value = s - dm->per_thread_data[thread_index].sessions;
151 clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
153 out2in_kv.key = s->out2in.as_u64;
154 out2in_kv.value = s - dm->per_thread_data[thread_index].sessions;
155 clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
158 nat_syslog_dslite_apmadd (b4_index, &s->in2out.softwire_id, &s->in2out.addr,
159 s->in2out.port, &s->out2in.addr, s->out2in.port,
166 dslite_icmp_in2out (dslite_main_t * dm, ip6_header_t * ip6,
167 ip4_header_t * ip4, dslite_session_t ** sp, u32 next,
168 u8 * error, u32 thread_index)
170 dslite_session_t *s = 0;
171 icmp46_header_t *icmp = ip4_next_header (ip4);
172 clib_bihash_kv_24_8_t kv, value;
173 dslite_session_key_t key;
175 icmp_echo_header_t *echo;
176 u32 new_addr, old_addr;
180 if (icmp_is_error_message (icmp))
182 n = DSLITE_IN2OUT_NEXT_DROP;
183 *error = DSLITE_ERROR_BAD_ICMP_TYPE;
187 echo = (icmp_echo_header_t *) (icmp + 1);
189 key.addr = ip4->src_address;
190 key.port = echo->identifier;
191 key.proto = SNAT_PROTOCOL_ICMP;
192 key.softwire_id.as_u64[0] = ip6->src_address.as_u64[0];
193 key.softwire_id.as_u64[1] = ip6->src_address.as_u64[1];
195 kv.key[0] = key.as_u64[0];
196 kv.key[1] = key.as_u64[1];
197 kv.key[2] = key.as_u64[2];
199 if (clib_bihash_search_24_8
200 (&dm->per_thread_data[thread_index].in2out, &kv, &value))
202 n = slow_path (dm, &key, &s, next, error, thread_index);
203 if (PREDICT_FALSE (next == DSLITE_IN2OUT_NEXT_DROP))
209 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
213 old_addr = ip4->src_address.as_u32;
214 ip4->src_address = s->out2in.addr;
215 new_addr = ip4->src_address.as_u32;
217 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
218 ip4->checksum = ip_csum_fold (sum);
220 old_id = echo->identifier;
221 echo->identifier = new_id = s->out2in.port;
222 sum = icmp->checksum;
223 sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
224 icmp->checksum = ip_csum_fold (sum);
232 dslite_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
233 vlib_frame_t * frame, u8 is_slow_path)
235 u32 n_left_from, *from, *to_next;
236 dslite_in2out_next_t next_index;
238 vlib_node_runtime_t *error_node;
239 u32 thread_index = vm->thread_index;
240 f64 now = vlib_time_now (vm);
241 dslite_main_t *dm = &dslite_main;
244 is_slow_path ? dslite_in2out_slowpath_node.
245 index : dslite_in2out_node.index;
247 error_node = vlib_node_get_runtime (vm, node_index);
249 from = vlib_frame_vector_args (frame);
250 n_left_from = frame->n_vectors;
251 next_index = node->cached_next_index;
253 while (n_left_from > 0)
257 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
259 while (n_left_from > 0 && n_left_to_next > 0)
263 u32 next0 = DSLITE_IN2OUT_NEXT_IP4_LOOKUP;
266 u8 error0 = DSLITE_ERROR_IN2OUT;
268 dslite_session_t *s0 = 0;
269 clib_bihash_kv_24_8_t kv0, value0;
270 dslite_session_key_t key0;
274 u32 new_addr0, old_addr0;
275 u16 old_port0, new_port0;
277 /* speculatively enqueue b0 to the current next frame */
285 b0 = vlib_get_buffer (vm, bi0);
286 ip60 = vlib_buffer_get_current (b0);
288 if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP))
290 if (ip60->protocol == IP_PROTOCOL_ICMP6)
292 next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP;
295 error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL;
296 next0 = DSLITE_IN2OUT_NEXT_DROP;
300 ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t);
301 proto0 = ip_proto_to_snat_proto (ip40->protocol);
303 if (PREDICT_FALSE (proto0 == ~0))
305 error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
306 next0 = DSLITE_IN2OUT_NEXT_DROP;
310 udp0 = ip4_next_header (ip40);
311 tcp0 = (tcp_header_t *) udp0;
315 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
318 dslite_icmp_in2out (dm, ip60, ip40, &s0, next0, &error0,
320 if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
328 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
330 next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
335 key0.addr = ip40->src_address;
336 key0.port = udp0->src_port;
338 key0.softwire_id.as_u64[0] = ip60->src_address.as_u64[0];
339 key0.softwire_id.as_u64[1] = ip60->src_address.as_u64[1];
341 kv0.key[0] = key0.as_u64[0];
342 kv0.key[1] = key0.as_u64[1];
343 kv0.key[2] = key0.as_u64[2];
345 if (clib_bihash_search_24_8
346 (&dm->per_thread_data[thread_index].in2out, &kv0, &value0))
351 slow_path (dm, &key0, &s0, next0, &error0, thread_index);
352 if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
357 next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
364 pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
368 old_addr0 = ip40->src_address.as_u32;
369 ip40->src_address = s0->out2in.addr;
370 new_addr0 = ip40->src_address.as_u32;
371 sum0 = ip40->checksum;
373 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
375 ip40->checksum = ip_csum_fold (sum0);
376 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
378 old_port0 = tcp0->src_port;
379 tcp0->src_port = s0->out2in.port;
380 new_port0 = tcp0->src_port;
382 sum0 = tcp0->checksum;
384 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
387 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
389 mss_clamping (&snat_main, tcp0, &sum0);
390 tcp0->checksum = ip_csum_fold (sum0);
394 old_port0 = udp0->src_port;
395 udp0->src_port = s0->out2in.port;
401 s0->last_heard = now;
403 s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
404 /* Per-B4 LRU list maintenance */
405 clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
407 clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
408 s0->per_b4_list_head_index, s0->per_b4_index);
411 (clib_net_to_host_u32
412 (ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >>
414 vlib_buffer_advance (b0, sizeof (ip6_header_t));
417 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
418 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
420 dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
421 t->next_index = next0;
422 t->session_index = ~0;
425 s0 - dm->per_thread_data[thread_index].sessions;
428 b0->error = error_node->errors[error0];
430 /* verify speculative enqueue, maybe switch current next frame */
431 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
432 n_left_to_next, bi0, next0);
434 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
437 return frame->n_vectors;
441 dslite_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
442 vlib_frame_t * frame)
444 return dslite_in2out_node_fn_inline (vm, node, frame, 0);
448 VLIB_REGISTER_NODE (dslite_in2out_node) = {
449 .function = dslite_in2out_node_fn,
450 .name = "dslite-in2out",
451 .vector_size = sizeof (u32),
452 .format_trace = format_dslite_trace,
453 .type = VLIB_NODE_TYPE_INTERNAL,
454 .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
455 .error_strings = dslite_in2out_error_strings,
456 .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
457 /* edit / add dispositions here */
459 [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
460 [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
461 [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input",
462 [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
467 VLIB_NODE_FUNCTION_MULTIARCH (dslite_in2out_node, dslite_in2out_node_fn);
470 dslite_in2out_slowpath_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
471 vlib_frame_t * frame)
473 return dslite_in2out_node_fn_inline (vm, node, frame, 1);
477 VLIB_REGISTER_NODE (dslite_in2out_slowpath_node) = {
478 .function = dslite_in2out_slowpath_node_fn,
479 .name = "dslite-in2out-slowpath",
480 .vector_size = sizeof (u32),
481 .format_trace = format_dslite_trace,
482 .type = VLIB_NODE_TYPE_INTERNAL,
483 .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
484 .error_strings = dslite_in2out_error_strings,
485 .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
486 /* edit / add dispositions here */
488 [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
489 [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
490 [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-lookup",
491 [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
496 VLIB_NODE_FUNCTION_MULTIARCH (dslite_in2out_slowpath_node,
497 dslite_in2out_slowpath_node_fn);
500 * fd.io coding-style-patch-verification: ON
503 * eval: (c-set-style "gnu")