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 Classify for one armed NAT44 (in+out interface)
20 #include <vlib/vlib.h>
21 #include <vnet/vnet.h>
22 #include <vnet/fib/ip4_fib.h>
24 #include <nat/nat_inlines.h>
26 #define foreach_nat44_classify_error \
27 _(NEXT_IN2OUT, "next in2out") \
28 _(NEXT_OUT2IN, "next out2in") \
29 _(FRAG_CACHED, "fragment cached")
33 #define _(sym,str) NAT44_CLASSIFY_ERROR_##sym,
34 foreach_nat44_classify_error
36 NAT44_CLASSIFY_N_ERROR,
37 } nat44_classify_error_t;
39 static char *nat44_classify_error_strings[] = {
40 #define _(sym,string) string,
41 foreach_nat44_classify_error
47 NAT44_CLASSIFY_NEXT_IN2OUT,
48 NAT44_CLASSIFY_NEXT_OUT2IN,
49 NAT44_CLASSIFY_NEXT_DROP,
50 NAT44_CLASSIFY_N_NEXT,
51 } nat44_classify_next_t;
57 } nat44_classify_trace_t;
60 format_nat44_classify_trace (u8 * s, va_list * args)
62 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
63 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
64 nat44_classify_trace_t *t = va_arg (*args, nat44_classify_trace_t *);
68 s = format (s, "nat44-classify: fragment cached");
71 next = t->next_in2out ? "nat44-in2out" : "nat44-out2in";
72 s = format (s, "nat44-classify: next %s", next);
79 nat44_classify_node_fn_inline (vlib_main_t * vm,
80 vlib_node_runtime_t * node,
83 u32 n_left_from, *from, *to_next;
84 nat44_classify_next_t next_index;
85 snat_main_t *sm = &snat_main;
86 snat_static_mapping_t *m;
87 u32 *fragments_to_drop = 0;
88 u32 next_in2out = 0, next_out2in = 0, frag_cached = 0;
90 from = vlib_frame_vector_args (frame);
91 n_left_from = frame->n_vectors;
92 next_index = node->cached_next_index;
94 while (n_left_from > 0)
98 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
100 while (n_left_from > 0 && n_left_to_next > 0)
104 u32 next0 = NAT44_CLASSIFY_NEXT_IN2OUT;
107 snat_session_key_t m_key0;
108 clib_bihash_kv_8_8_t kv0, value0;
110 /* speculatively enqueue b0 to the current next frame */
118 b0 = vlib_get_buffer (vm, bi0);
119 ip0 = vlib_buffer_get_current (b0);
122 vec_foreach (ap, sm->addresses)
124 if (ip0->dst_address.as_u32 == ap->addr.as_u32)
126 next0 = NAT44_CLASSIFY_NEXT_OUT2IN;
132 if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
134 m_key0.addr = ip0->dst_address;
137 m_key0.fib_index = 0;
138 kv0.key = m_key0.as_u64;
139 /* try to classify the fragment based on IP header alone */
140 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external,
143 m = pool_elt_at_index (sm->static_mappings, value0.value);
144 if (m->local_addr.as_u32 != m->external_addr.as_u32)
145 next0 = NAT44_CLASSIFY_NEXT_OUT2IN;
149 clib_net_to_host_u16 (vnet_buffer (b0)->ip.reass.l4_dst_port);
150 m_key0.protocol = ip_proto_to_snat_proto (ip0->protocol);
151 kv0.key = m_key0.as_u64;
152 if (!clib_bihash_search_8_8
153 (&sm->static_mapping_by_external, &kv0, &value0))
155 m = pool_elt_at_index (sm->static_mappings, value0.value);
156 if (m->local_addr.as_u32 != m->external_addr.as_u32)
157 next0 = NAT44_CLASSIFY_NEXT_OUT2IN;
162 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
163 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
165 nat44_classify_trace_t *t =
166 vlib_add_trace (vm, node, b0, sizeof (*t));
168 t->next_in2out = next0 == NAT44_CLASSIFY_NEXT_IN2OUT ? 1 : 0;
171 next_in2out += next0 == NAT44_CLASSIFY_NEXT_IN2OUT;
172 next_out2in += next0 == NAT44_CLASSIFY_NEXT_OUT2IN;
174 /* verify speculative enqueue, maybe switch current next frame */
175 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
176 to_next, n_left_to_next,
180 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
183 nat_send_all_to_node (vm, fragments_to_drop, node, 0,
184 NAT44_CLASSIFY_NEXT_DROP);
186 vec_free (fragments_to_drop);
188 vlib_node_increment_counter (vm, node->node_index,
189 NAT44_CLASSIFY_ERROR_NEXT_IN2OUT, next_in2out);
190 vlib_node_increment_counter (vm, node->node_index,
191 NAT44_CLASSIFY_ERROR_NEXT_OUT2IN, next_out2in);
192 vlib_node_increment_counter (vm, node->node_index,
193 NAT44_CLASSIFY_ERROR_FRAG_CACHED, frag_cached);
195 return frame->n_vectors;
199 nat44_ed_classify_node_fn_inline (vlib_main_t * vm,
200 vlib_node_runtime_t * node,
201 vlib_frame_t * frame)
203 u32 n_left_from, *from, *to_next;
204 nat44_classify_next_t next_index;
205 snat_main_t *sm = &snat_main;
206 snat_static_mapping_t *m;
207 u32 thread_index = vm->thread_index;
208 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
209 u32 *fragments_to_drop = 0;
210 u32 next_in2out = 0, next_out2in = 0, frag_cached = 0;
213 from = vlib_frame_vector_args (frame);
214 n_left_from = frame->n_vectors;
215 next_index = node->cached_next_index;
217 while (n_left_from > 0)
221 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
223 while (n_left_from > 0 && n_left_to_next > 0)
228 NAT_NEXT_IN2OUT_ED_FAST_PATH, sw_if_index0, rx_fib_index0;
231 snat_session_key_t m_key0;
232 clib_bihash_kv_8_8_t kv0, value0;
233 clib_bihash_kv_16_8_t ed_kv0, ed_value0;
235 /* speculatively enqueue b0 to the current next frame */
243 b0 = vlib_get_buffer (vm, bi0);
244 ip0 = vlib_buffer_get_current (b0);
250 vnet_feature_next (&arc_next, b0);
251 nat_buffer_opaque (b0)->arc_next = arc_next;
254 if (ip0->protocol != IP_PROTOCOL_ICMP)
256 /* process leading fragment/whole packet (with L4 header) */
257 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
259 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
261 make_ed_kv (&ed_kv0, &ip0->src_address,
262 &ip0->dst_address, ip0->protocol,
264 vnet_buffer (b0)->ip.reass.l4_src_port,
265 vnet_buffer (b0)->ip.reass.l4_dst_port);
266 /* process whole packet */
267 if (!clib_bihash_search_16_8
268 (&tsm->in2out_ed, &ed_kv0, &ed_value0))
270 /* session doesn't exist so continue in code */
274 vec_foreach (ap, sm->addresses)
276 if (ip0->dst_address.as_u32 == ap->addr.as_u32)
278 next0 = NAT_NEXT_OUT2IN_ED_FAST_PATH;
284 if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
286 m_key0.addr = ip0->dst_address;
289 m_key0.fib_index = 0;
290 kv0.key = m_key0.as_u64;
291 /* try to classify the fragment based on IP header alone */
292 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external,
295 m = pool_elt_at_index (sm->static_mappings, value0.value);
296 if (m->local_addr.as_u32 != m->external_addr.as_u32)
297 next0 = NAT_NEXT_OUT2IN_ED_FAST_PATH;
301 clib_net_to_host_u16 (vnet_buffer (b0)->ip.reass.l4_dst_port);
302 m_key0.protocol = ip_proto_to_snat_proto (ip0->protocol);
303 kv0.key = m_key0.as_u64;
304 if (!clib_bihash_search_8_8
305 (&sm->static_mapping_by_external, &kv0, &value0))
307 m = pool_elt_at_index (sm->static_mappings, value0.value);
308 if (m->local_addr.as_u32 != m->external_addr.as_u32)
309 next0 = NAT_NEXT_OUT2IN_ED_FAST_PATH;
314 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
315 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
317 nat44_classify_trace_t *t =
318 vlib_add_trace (vm, node, b0, sizeof (*t));
320 t->next_in2out = next0 == NAT_NEXT_IN2OUT_ED_FAST_PATH ? 1 : 0;
323 next_in2out += next0 == NAT_NEXT_IN2OUT_ED_FAST_PATH;
324 next_out2in += next0 == NAT_NEXT_OUT2IN_ED_FAST_PATH;
326 /* verify speculative enqueue, maybe switch current next frame */
327 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
328 to_next, n_left_to_next,
332 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
335 nat_send_all_to_node (vm, fragments_to_drop, node, 0,
336 NAT44_CLASSIFY_NEXT_DROP);
338 vec_free (fragments_to_drop);
340 vlib_node_increment_counter (vm, node->node_index,
341 NAT44_CLASSIFY_ERROR_NEXT_IN2OUT, next_in2out);
342 vlib_node_increment_counter (vm, node->node_index,
343 NAT44_CLASSIFY_ERROR_NEXT_OUT2IN, next_out2in);
344 vlib_node_increment_counter (vm, node->node_index,
345 NAT44_CLASSIFY_ERROR_FRAG_CACHED, frag_cached);
347 return frame->n_vectors;
350 VLIB_NODE_FN (nat44_classify_node) (vlib_main_t * vm,
351 vlib_node_runtime_t * node,
352 vlib_frame_t * frame)
354 return nat44_classify_node_fn_inline (vm, node, frame);
358 VLIB_REGISTER_NODE (nat44_classify_node) = {
359 .name = "nat44-classify",
360 .vector_size = sizeof (u32),
361 .format_trace = format_nat44_classify_trace,
362 .type = VLIB_NODE_TYPE_INTERNAL,
363 .n_errors = ARRAY_LEN(nat44_classify_error_strings),
364 .error_strings = nat44_classify_error_strings,
365 .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
367 [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out",
368 [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in",
369 [NAT44_CLASSIFY_NEXT_DROP] = "error-drop",
374 VLIB_NODE_FN (nat44_ed_classify_node) (vlib_main_t * vm,
375 vlib_node_runtime_t * node,
376 vlib_frame_t * frame)
378 return nat44_ed_classify_node_fn_inline (vm, node, frame);
382 VLIB_REGISTER_NODE (nat44_ed_classify_node) = {
383 .name = "nat44-ed-classify",
384 .vector_size = sizeof (u32),
385 .sibling_of = "nat-default",
386 .format_trace = format_nat44_classify_trace,
387 .type = VLIB_NODE_TYPE_INTERNAL,
391 VLIB_NODE_FN (nat44_det_classify_node) (vlib_main_t * vm,
392 vlib_node_runtime_t * node,
393 vlib_frame_t * frame)
395 return nat44_classify_node_fn_inline (vm, node, frame);
399 VLIB_REGISTER_NODE (nat44_det_classify_node) = {
400 .name = "nat44-det-classify",
401 .vector_size = sizeof (u32),
402 .format_trace = format_nat44_classify_trace,
403 .type = VLIB_NODE_TYPE_INTERNAL,
404 .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
406 [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-det-in2out",
407 [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-det-out2in",
408 [NAT44_CLASSIFY_NEXT_DROP] = "error-drop",
413 VLIB_NODE_FN (nat44_handoff_classify_node) (vlib_main_t * vm,
414 vlib_node_runtime_t * node,
415 vlib_frame_t * frame)
417 return nat44_classify_node_fn_inline (vm, node, frame);
421 VLIB_REGISTER_NODE (nat44_handoff_classify_node) = {
422 .name = "nat44-handoff-classify",
423 .vector_size = sizeof (u32),
424 .format_trace = format_nat44_classify_trace,
425 .type = VLIB_NODE_TYPE_INTERNAL,
426 .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
428 [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out-worker-handoff",
429 [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in-worker-handoff",
430 [NAT44_CLASSIFY_NEXT_DROP] = "error-drop",
437 * fd.io coding-style-patch-verification: ON
440 * eval: (c-set-style "gnu")