2 * nsh_output.c: NSH Adj rewrite
4 * Copyright (c) 2017-2019 Intel and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/ip/ip.h>
24 /* Adjacency taken. */
28 /* Packet data, possibly *after* rewrite. */
29 u8 packet_data[64 - 1*sizeof(u32)];
32 #define foreach_nsh_output_next \
33 _(DROP, "error-drop") \
34 _(INTERFACE, "interface-output" )
37 #define _(s,n) NSH_OUTPUT_NEXT_##s,
38 foreach_nsh_output_next
44 format_nsh_output_trace (u8 * s, va_list * args)
46 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
47 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
48 nsh_output_trace_t * t = va_arg (*args, nsh_output_trace_t *);
49 uword indent = format_get_indent (s);
51 s = format (s, "adj-idx %d : %U flow hash: 0x%08x",
53 format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE,
55 s = format (s, "\n%U%U",
56 format_white_space, indent,
57 format_ip_adjacency_packet_data,
58 t->adj_index, t->packet_data, sizeof (t->packet_data));
63 nsh_output_inline (vlib_main_t * vm,
64 vlib_node_runtime_t * node,
65 vlib_frame_t * from_frame,
68 u32 n_left_from, next_index, * from, * to_next, thread_index;
69 vlib_node_runtime_t * error_node;
73 thread_index = vlib_get_thread_index();
74 error_node = vlib_node_get_runtime (vm, nsh_eth_output_node.index);
75 from = vlib_frame_vector_args (from_frame);
76 n_left_from = from_frame->n_vectors;
77 next_index = node->cached_next_index;
80 while (n_left_from > 0)
82 vlib_get_next_frame (vm, node, next_index,
83 to_next, n_left_to_next);
85 while (n_left_from >= 4 && n_left_to_next >= 2)
87 ip_adjacency_t * adj0;
88 nsh_base_header_t *hdr0;
89 ethernet_header_t * eth_hdr0;
91 u32 pi0, rw_len0, adj_index0, next0, error0;
93 ip_adjacency_t * adj1;
94 nsh_base_header_t *hdr1;
95 ethernet_header_t * eth_hdr1;
97 u32 pi1, rw_len1, adj_index1, next1, error1;
99 /* Prefetch next iteration. */
101 vlib_buffer_t * p2, * p3;
103 p2 = vlib_get_buffer (vm, from[2]);
104 p3 = vlib_get_buffer (vm, from[3]);
106 vlib_prefetch_buffer_header (p2, STORE);
107 vlib_prefetch_buffer_header (p3, STORE);
109 CLIB_PREFETCH (p2->data, sizeof (hdr0[0]), STORE);
110 CLIB_PREFETCH (p3->data, sizeof (hdr1[0]), STORE);
113 pi0 = to_next[0] = from[0];
114 pi1 = to_next[1] = from[1];
121 p0 = vlib_get_buffer (vm, pi0);
122 p1 = vlib_get_buffer (vm, pi1);
124 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
125 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
127 adj0 = adj_get(adj_index0);
128 adj1 = adj_get(adj_index1);
129 hdr0 = vlib_buffer_get_current (p0);
130 hdr1 = vlib_buffer_get_current (p1);
132 /* Guess we are only writing on simple Ethernet header. */
133 vnet_rewrite_two_headers (adj0[0], adj1[0], hdr0, hdr1,
134 sizeof (ethernet_header_t));
136 eth_hdr0 = (ethernet_header_t*)((u8 *)hdr0-sizeof(ethernet_header_t));
137 eth_hdr0->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
138 eth_hdr1 = (ethernet_header_t*)((u8 *)hdr1-sizeof(ethernet_header_t));
139 eth_hdr1->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
141 /* Update packet buffer attributes/set output interface. */
142 rw_len0 = adj0[0].rewrite_header.data_bytes;
143 rw_len1 = adj1[0].rewrite_header.data_bytes;
145 /* Bump the adj counters for packet and bytes */
146 vlib_increment_combined_counter
147 (&adjacency_counters,
151 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
152 vlib_increment_combined_counter
153 (&adjacency_counters,
157 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
159 /* Check MTU of outgoing interface. */
160 if (PREDICT_TRUE(vlib_buffer_length_in_chain (vm, p0) <=
161 adj0[0].rewrite_header.max_l3_packet_bytes))
163 p0->current_data -= rw_len0;
164 p0->current_length += rw_len0;
166 vnet_buffer (p0)->sw_if_index[VLIB_TX] =
167 adj0[0].rewrite_header.sw_if_index;
168 next0 = NSH_OUTPUT_NEXT_INTERFACE;
169 error0 = IP4_ERROR_NONE;
171 if (PREDICT_FALSE(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
172 vnet_feature_arc_start (nm->output_feature_arc_index,
173 adj0[0].rewrite_header.sw_if_index,
178 error0 = IP4_ERROR_MTU_EXCEEDED;
179 next0 = NSH_OUTPUT_NEXT_DROP;
181 if (PREDICT_TRUE(vlib_buffer_length_in_chain (vm, p1) <=
182 adj1[0].rewrite_header.max_l3_packet_bytes))
184 p1->current_data -= rw_len1;
185 p1->current_length += rw_len1;
187 vnet_buffer (p1)->sw_if_index[VLIB_TX] =
188 adj1[0].rewrite_header.sw_if_index;
189 next1 = NSH_OUTPUT_NEXT_INTERFACE;
190 error1 = IP4_ERROR_NONE;
192 if (PREDICT_FALSE(adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
193 vnet_feature_arc_start (nm->output_feature_arc_index,
194 adj1[0].rewrite_header.sw_if_index,
199 error1 = IP4_ERROR_MTU_EXCEEDED;
200 next1 = NSH_OUTPUT_NEXT_DROP;
204 adj0->sub_type.midchain.fixup_func
205 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
206 adj1->sub_type.midchain.fixup_func
207 (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
210 p0->error = error_node->errors[error0];
211 p1->error = error_node->errors[error1];
213 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
215 nsh_output_trace_t *tr = vlib_add_trace (vm, node,
217 tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
218 tr->flow_hash = vnet_buffer(p0)->ip.flow_hash;
220 if (PREDICT_FALSE(p1->flags & VLIB_BUFFER_IS_TRACED))
222 nsh_output_trace_t *tr = vlib_add_trace (vm, node,
224 tr->adj_index = vnet_buffer(p1)->ip.adj_index[VLIB_TX];
225 tr->flow_hash = vnet_buffer(p1)->ip.flow_hash;
228 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
229 to_next, n_left_to_next,
230 pi0, pi1, next0, next1);
233 while (n_left_from > 0 && n_left_to_next > 0)
235 ip_adjacency_t * adj0;
236 nsh_base_header_t *hdr0;
237 ethernet_header_t * eth_hdr0;
239 u32 pi0, rw_len0, adj_index0, next0, error0;
241 pi0 = to_next[0] = from[0];
243 p0 = vlib_get_buffer (vm, pi0);
245 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
247 adj0 = adj_get(adj_index0);
248 hdr0 = vlib_buffer_get_current (p0);
250 /* Guess we are only writing on simple Ethernet header. */
251 vnet_rewrite_one_header (adj0[0], hdr0,
252 sizeof (ethernet_header_t));
254 eth_hdr0 = (ethernet_header_t*)((u8 *)hdr0-sizeof(ethernet_header_t));
255 eth_hdr0->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
257 /* Update packet buffer attributes/set output interface. */
258 rw_len0 = adj0[0].rewrite_header.data_bytes;
260 vlib_increment_combined_counter
261 (&adjacency_counters,
265 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
267 /* Check MTU of outgoing interface. */
268 if (PREDICT_TRUE(vlib_buffer_length_in_chain (vm, p0) <=
269 adj0[0].rewrite_header.max_l3_packet_bytes))
271 p0->current_data -= rw_len0;
272 p0->current_length += rw_len0;
274 vnet_buffer (p0)->sw_if_index[VLIB_TX] =
275 adj0[0].rewrite_header.sw_if_index;
276 next0 = NSH_OUTPUT_NEXT_INTERFACE;
277 error0 = IP4_ERROR_NONE;
279 if (PREDICT_FALSE(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
280 vnet_feature_arc_start (nm->output_feature_arc_index,
281 adj0[0].rewrite_header.sw_if_index,
286 error0 = IP4_ERROR_MTU_EXCEEDED;
287 next0 = NSH_OUTPUT_NEXT_DROP;
291 adj0->sub_type.midchain.fixup_func
292 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
295 p0->error = error_node->errors[error0];
302 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
304 nsh_output_trace_t *tr = vlib_add_trace (vm, node,
306 tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
307 tr->flow_hash = vnet_buffer(p0)->ip.flow_hash;
310 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
311 to_next, n_left_to_next,
315 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
318 return from_frame->n_vectors;
321 typedef enum nsh_midchain_next_t_
323 NSH_MIDCHAIN_NEXT_DROP,
324 } nsh_midchain_next_t;
327 nsh_eth_output (vlib_main_t * vm,
328 vlib_node_runtime_t * node,
329 vlib_frame_t * from_frame)
331 return (nsh_output_inline(vm, node, from_frame, /* is_midchain */ 0));
334 VLIB_REGISTER_NODE (nsh_eth_output_node) = {
335 .function = nsh_eth_output,
336 .name = "nsh-eth-output",
337 /* Takes a vector of packets. */
338 .vector_size = sizeof (u32),
339 .n_next_nodes = NSH_OUTPUT_N_NEXT,
341 #define _(s,n) [NSH_OUTPUT_NEXT_##s] = n,
342 foreach_nsh_output_next
346 .format_trace = format_nsh_output_trace,
349 VLIB_NODE_FUNCTION_MULTIARCH (nsh_eth_output_node, nsh_eth_output)
352 nsh_midchain (vlib_main_t * vm,
353 vlib_node_runtime_t * node,
354 vlib_frame_t * from_frame)
356 return (nsh_output_inline(vm, node, from_frame, /* is_midchain */ 1));
359 VLIB_REGISTER_NODE (nsh_midchain_node) = {
360 .function = nsh_midchain,
361 .name = "nsh-midchain",
362 .vector_size = sizeof (u32),
363 .format_trace = format_nsh_output_trace,
366 [NSH_MIDCHAIN_NEXT_DROP] = "error-drop",
370 VLIB_NODE_FUNCTION_MULTIARCH (nsh_midchain_node, nsh_midchain)
372 /* Built-in nsh tx feature path definition */
373 VNET_FEATURE_INIT (nsh_interface_output, static) = {
374 .arc_name = "nsh-eth-output",
375 .node_name = "interface-output",
376 .runs_before = 0, /* not before any other features */
379 /* Built-in ip4 tx feature path definition */
381 VNET_FEATURE_ARC_INIT (nsh_eth_output, static) =
383 .arc_name = "nsh-eth-output",
384 .start_nodes = VNET_FEATURES ("nsh-midchain"),
387 VNET_FEATURE_INIT (nsh_eth_tx_drop, static) =
389 .arc_name = "nsh-eth-output",
390 .node_name = "error-drop",
391 .runs_before = 0, /* not before any other features */
395 * @brief Next index values from the NSH incomplete adj node
397 #define foreach_nsh_adj_incomplete_next \
398 _(DROP, "error-drop") \
400 _(IP6, "ip6-discover-neighbor")
403 #define _(s,n) NSH_ADJ_INCOMPLETE_NEXT_##s,
404 foreach_nsh_adj_incomplete_next
406 NSH_ADJ_INCOMPLETE_N_NEXT,
407 } nsh_adj_incomplete_next_t;
410 * @brief A struct to hold tracing information for the NSH label imposition
413 typedef struct nsh_adj_incomplete_trace_t_
416 } nsh_adj_incomplete_trace_t;
420 * @brief Graph node for incomplete NSH adjacency.
421 * This node will push traffic to either the v4-arp or v6-nd node
422 * based on the next-hop proto of the adj.
423 * We pay a cost for this 'routing' node, but an incomplete adj is the
427 nsh_adj_incomplete (vlib_main_t * vm,
428 vlib_node_runtime_t * node,
429 vlib_frame_t * from_frame)
431 u32 n_left_from, next_index, * from, * to_next;
433 from = vlib_frame_vector_args (from_frame);
434 n_left_from = from_frame->n_vectors;
435 next_index = node->cached_next_index;
437 while (n_left_from > 0)
441 vlib_get_next_frame (vm, node, next_index,
442 to_next, n_left_to_next);
444 while (n_left_from > 0 && n_left_to_next > 0)
446 u32 pi0, next0, adj_index0;
447 ip_adjacency_t * adj0;
450 pi0 = to_next[0] = from[0];
451 p0 = vlib_get_buffer (vm, pi0);
457 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
459 adj0 = adj_get(adj_index0);
461 if (PREDICT_TRUE(FIB_PROTOCOL_IP4 == adj0->ia_nh_proto))
463 next0 = NSH_ADJ_INCOMPLETE_NEXT_IP4;
467 next0 = NSH_ADJ_INCOMPLETE_NEXT_IP6;
470 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
472 nsh_adj_incomplete_trace_t *tr =
473 vlib_add_trace (vm, node, p0, sizeof (*tr));
477 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
478 to_next, n_left_to_next,
482 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
485 return from_frame->n_vectors;
489 format_nsh_adj_incomplete_trace (u8 * s, va_list * args)
491 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
492 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
493 nsh_adj_incomplete_trace_t * t;
496 t = va_arg (*args, nsh_adj_incomplete_trace_t *);
497 indent = format_get_indent (s);
499 s = format (s, "%Unext:%d",
500 format_white_space, indent,
505 VLIB_REGISTER_NODE (nsh_adj_incomplete_node) = {
506 .function = nsh_adj_incomplete,
507 .name = "nsh-adj-incomplete",
508 .format_trace = format_nsh_adj_incomplete_trace,
509 /* Takes a vector of packets. */
510 .vector_size = sizeof (u32),
511 .n_next_nodes = NSH_ADJ_INCOMPLETE_N_NEXT,
513 #define _(s,n) [NSH_ADJ_INCOMPLETE_NEXT_##s] = n,
514 foreach_nsh_adj_incomplete_next
519 VLIB_NODE_FUNCTION_MULTIARCH (nsh_adj_incomplete_node,