2 * node.c: udp packet processing
4 * Copyright (c) 2013-2019 Cisco 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/udp/udp.h>
21 #include <vnet/udp/udp_packet.h>
22 #include <vppinfra/sparse_vec.h>
37 } udp_local_rx_trace_t;
39 #define UDP_NO_NODE_SET ((u16) ~0)
41 #ifndef CLIB_MARCH_VARIANT
43 format_udp_rx_trace (u8 * s, va_list * args)
45 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
46 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
47 udp_local_rx_trace_t *t = va_arg (*args, udp_local_rx_trace_t *);
49 s = format (s, "UDP: src-port %d dst-port %d%s",
50 clib_net_to_host_u16 (t->src_port),
51 clib_net_to_host_u16 (t->dst_port),
52 t->bound ? "" : " (no listener)");
55 #endif /* CLIB_MARCH_VARIANT */
58 udp_dispatch_error (vlib_node_runtime_t *node, vlib_buffer_t *b, u32 advance,
61 udp_main_t *um = &udp_main;
62 u8 punt_unknown = is_ip4 ? um->punt_unknown4 : um->punt_unknown6;
64 if (PREDICT_FALSE (punt_unknown))
66 vlib_buffer_advance (b, -(word) advance);
67 b->error = node->errors[UDP_ERROR_PUNT];
68 *next = UDP_LOCAL_NEXT_PUNT;
70 else if (um->icmp_send_unreachable_disabled)
72 *next = UDP_LOCAL_NEXT_DROP;
73 b->error = node->errors[UDP_ERROR_NO_LISTENER];
77 /* move the pointer back so icmp-error can find the ip packet header */
78 vlib_buffer_advance (b, -(word) advance);
82 icmp4_error_set_vnet_buffer (
83 b, ICMP4_destination_unreachable,
84 ICMP4_destination_unreachable_port_unreachable, 0);
85 b->error = node->errors[UDP_ERROR_NO_LISTENER];
86 *next = UDP_LOCAL_NEXT_ICMP;
90 icmp6_error_set_vnet_buffer (
91 b, ICMP6_destination_unreachable,
92 ICMP6_destination_unreachable_port_unreachable, 0);
93 b->error = node->errors[UDP_ERROR_NO_LISTENER];
94 *next = UDP_LOCAL_NEXT_ICMP;
100 udp46_local_inline (vlib_main_t * vm,
101 vlib_node_runtime_t * node,
102 vlib_frame_t * from_frame, int is_ip4)
104 udp_main_t *um = &udp_main;
105 __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
106 u16 *next_by_dst_port = (is_ip4 ?
107 um->next_by_dst_port4 : um->next_by_dst_port6);
108 from = vlib_frame_vector_args (from_frame);
109 n_left_from = from_frame->n_vectors;
111 next_index = node->cached_next_index;
113 while (n_left_from > 0)
117 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
119 while (n_left_from >= 4 && n_left_to_next >= 2)
122 vlib_buffer_t *b0, *b1;
123 udp_header_t *h0 = 0, *h1 = 0;
124 u32 i0, i1, dst_port0, dst_port1;
125 u32 advance0, advance1;
126 u32 error0, next0, error1, next1;
128 /* Prefetch next iteration. */
130 vlib_buffer_t *p2, *p3;
132 p2 = vlib_get_buffer (vm, from[2]);
133 p3 = vlib_get_buffer (vm, from[3]);
135 vlib_prefetch_buffer_header (p2, LOAD);
136 vlib_prefetch_buffer_header (p3, LOAD);
138 CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
139 CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
151 b0 = vlib_get_buffer (vm, bi0);
152 b1 = vlib_get_buffer (vm, bi1);
154 /* ip4/6_local hands us the ip header, not the udp header */
157 advance0 = ip4_header_bytes (vlib_buffer_get_current (b0));
158 advance1 = ip4_header_bytes (vlib_buffer_get_current (b1));
162 advance0 = sizeof (ip6_header_t);
163 advance1 = sizeof (ip6_header_t);
166 if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0)))
168 error0 = UDP_ERROR_LENGTH_ERROR;
169 next0 = UDP_LOCAL_NEXT_DROP;
173 vlib_buffer_advance (b0, advance0);
174 h0 = vlib_buffer_get_current (b0);
175 error0 = UDP_ERROR_NONE;
176 next0 = UDP_LOCAL_NEXT_PUNT;
177 if (PREDICT_FALSE (clib_net_to_host_u16 (h0->length) >
178 vlib_buffer_length_in_chain (vm, b0)))
180 error0 = UDP_ERROR_LENGTH_ERROR;
181 next0 = UDP_LOCAL_NEXT_DROP;
185 if (PREDICT_FALSE (b1->current_length < advance1 + sizeof (*h1)))
187 error1 = UDP_ERROR_LENGTH_ERROR;
188 next1 = UDP_LOCAL_NEXT_DROP;
192 vlib_buffer_advance (b1, advance1);
193 h1 = vlib_buffer_get_current (b1);
194 error1 = UDP_ERROR_NONE;
195 next1 = UDP_LOCAL_NEXT_PUNT;
196 if (PREDICT_FALSE (clib_net_to_host_u16 (h1->length) >
197 vlib_buffer_length_in_chain (vm, b1)))
199 error1 = UDP_ERROR_LENGTH_ERROR;
200 next1 = UDP_LOCAL_NEXT_DROP;
204 /* Index sparse array with network byte order. */
205 dst_port0 = (error0 == 0) ? h0->dst_port : 0;
206 dst_port1 = (error1 == 0) ? h1->dst_port : 0;
207 sparse_vec_index2 (next_by_dst_port, dst_port0, dst_port1, &i0,
209 next0 = (error0 == 0) ? vec_elt (next_by_dst_port, i0) : next0;
210 next1 = (error1 == 0) ? vec_elt (next_by_dst_port, i1) : next1;
212 if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX ||
213 next0 == UDP_NO_NODE_SET))
215 udp_dispatch_error (node, b0, advance0, is_ip4, &next0);
219 b0->error = node->errors[UDP_ERROR_NONE];
220 // advance to the payload
221 vlib_buffer_advance (b0, sizeof (*h0));
224 if (PREDICT_FALSE (i1 == SPARSE_VEC_INVALID_INDEX ||
225 next1 == UDP_NO_NODE_SET))
227 udp_dispatch_error (node, b1, advance1, is_ip4, &next1);
231 b1->error = node->errors[UDP_ERROR_NONE];
232 // advance to the payload
233 vlib_buffer_advance (b1, sizeof (*h1));
236 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
238 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
240 if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR])
242 tr->src_port = h0 ? h0->src_port : 0;
243 tr->dst_port = h0 ? h0->dst_port : 0;
244 tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP);
247 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
249 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
251 if (b1->error != node->errors[UDP_ERROR_LENGTH_ERROR])
253 tr->src_port = h1 ? h1->src_port : 0;
254 tr->dst_port = h1 ? h1->dst_port : 0;
255 tr->bound = (next1 != UDP_LOCAL_NEXT_ICMP);
259 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
260 to_next, n_left_to_next,
261 bi0, bi1, next0, next1);
264 while (n_left_from > 0 && n_left_to_next > 0)
268 udp_header_t *h0 = 0;
279 b0 = vlib_get_buffer (vm, bi0);
281 /* ip4/6_local hands us the ip header, not the udp header */
283 advance0 = ip4_header_bytes (vlib_buffer_get_current (b0));
285 advance0 = sizeof (ip6_header_t);
287 if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0)))
289 b0->error = node->errors[UDP_ERROR_LENGTH_ERROR];
290 next0 = UDP_LOCAL_NEXT_DROP;
294 vlib_buffer_advance (b0, advance0);
296 h0 = vlib_buffer_get_current (b0);
298 if (PREDICT_TRUE (clib_net_to_host_u16 (h0->length) <=
299 vlib_buffer_length_in_chain (vm, b0)))
301 i0 = sparse_vec_index (next_by_dst_port, h0->dst_port);
302 next0 = vec_elt (next_by_dst_port, i0);
304 if (PREDICT_FALSE ((i0 == SPARSE_VEC_INVALID_INDEX) ||
305 next0 == UDP_NO_NODE_SET))
307 udp_dispatch_error (node, b0, advance0, is_ip4, &next0);
311 b0->error = node->errors[UDP_ERROR_NONE];
312 // advance to the payload
313 vlib_buffer_advance (b0, sizeof (*h0));
318 b0->error = node->errors[UDP_ERROR_LENGTH_ERROR];
319 next0 = UDP_LOCAL_NEXT_DROP;
323 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
325 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
327 if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR])
329 tr->src_port = h0->src_port;
330 tr->dst_port = h0->dst_port;
331 tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP);
335 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
336 to_next, n_left_to_next,
340 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
342 return from_frame->n_vectors;
345 static char *udp_error_strings[] = {
346 #define udp_error(n,s) s,
347 #include "udp_error.def"
351 VLIB_NODE_FN (udp4_local_node) (vlib_main_t * vm,
352 vlib_node_runtime_t * node,
353 vlib_frame_t * from_frame)
355 return udp46_local_inline (vm, node, from_frame, 1 /* is_ip4 */ );
358 VLIB_NODE_FN (udp6_local_node) (vlib_main_t * vm,
359 vlib_node_runtime_t * node,
360 vlib_frame_t * from_frame)
362 return udp46_local_inline (vm, node, from_frame, 0 /* is_ip4 */ );
366 VLIB_REGISTER_NODE (udp4_local_node) = {
367 .name = "ip4-udp-lookup",
368 /* Takes a vector of packets. */
369 .vector_size = sizeof (u32),
371 .n_errors = UDP_N_ERROR,
372 .error_strings = udp_error_strings,
374 .n_next_nodes = UDP_LOCAL_N_NEXT,
376 [UDP_LOCAL_NEXT_PUNT]= "ip4-punt",
377 [UDP_LOCAL_NEXT_DROP]= "ip4-drop",
378 [UDP_LOCAL_NEXT_ICMP]= "ip4-icmp-error",
381 .format_buffer = format_udp_header,
382 .format_trace = format_udp_rx_trace,
383 .unformat_buffer = unformat_udp_header,
388 VLIB_REGISTER_NODE (udp6_local_node) = {
389 .name = "ip6-udp-lookup",
390 /* Takes a vector of packets. */
391 .vector_size = sizeof (u32),
393 .n_errors = UDP_N_ERROR,
394 .error_strings = udp_error_strings,
396 .n_next_nodes = UDP_LOCAL_N_NEXT,
398 [UDP_LOCAL_NEXT_PUNT]= "ip6-punt",
399 [UDP_LOCAL_NEXT_DROP]= "ip6-drop",
400 [UDP_LOCAL_NEXT_ICMP]= "ip6-icmp-error",
403 .format_buffer = format_udp_header,
404 .format_trace = format_udp_rx_trace,
405 .unformat_buffer = unformat_udp_header,
409 #ifndef CLIB_MARCH_VARIANT
411 udp_add_dst_port (udp_main_t * um, udp_dst_port_t dst_port,
412 char *dst_port_name, u8 is_ip4)
414 udp_dst_port_info_t *pi;
417 vec_add2 (um->dst_port_infos[is_ip4], pi, 1);
418 i = pi - um->dst_port_infos[is_ip4];
420 pi->name = dst_port_name;
421 pi->dst_port = dst_port;
422 pi->next_index = pi->node_index = ~0;
424 hash_set (um->dst_port_info_by_dst_port[is_ip4], dst_port, i);
427 hash_set_mem (um->dst_port_info_by_name[is_ip4], pi->name, i);
431 udp_register_dst_port (vlib_main_t * vm,
432 udp_dst_port_t dst_port, u32 node_index, u8 is_ip4)
434 udp_main_t *um = &udp_main;
435 udp_dst_port_info_t *pi;
439 clib_error_t *error = vlib_call_init_function (vm, udp_local_init);
441 clib_error_report (error);
444 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
447 udp_add_dst_port (um, dst_port, 0, is_ip4);
448 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
452 pi->node_index = node_index;
453 pi->next_index = vlib_node_add_next (vm,
454 is_ip4 ? udp4_local_node.index
455 : udp6_local_node.index, node_index);
457 /* Setup udp protocol -> next index sparse vector mapping. */
459 n = sparse_vec_validate (um->next_by_dst_port4,
460 clib_host_to_net_u16 (dst_port));
462 n = sparse_vec_validate (um->next_by_dst_port6,
463 clib_host_to_net_u16 (dst_port));
465 n[0] = pi->next_index;
469 udp_unregister_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u8 is_ip4)
471 udp_main_t *um = &udp_main;
472 udp_dst_port_info_t *pi;
475 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
476 /* Not registered? Fagedaboudit */
480 /* Kill the mapping. Don't bother killing the pi, it may be back. */
482 n = sparse_vec_validate (um->next_by_dst_port4,
483 clib_host_to_net_u16 (dst_port));
485 n = sparse_vec_validate (um->next_by_dst_port6,
486 clib_host_to_net_u16 (dst_port));
488 n[0] = UDP_NO_NODE_SET;
492 udp_is_valid_dst_port (udp_dst_port_t dst_port, u8 is_ip4)
494 udp_main_t *um = &udp_main;
498 n = sparse_vec_validate (um->next_by_dst_port4,
499 clib_host_to_net_u16 (dst_port));
501 n = sparse_vec_validate (um->next_by_dst_port6,
502 clib_host_to_net_u16 (dst_port));
504 return (n[0] != SPARSE_VEC_INVALID_INDEX && n[0] != UDP_NO_NODE_SET);
508 udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
510 udp_main_t *um = &udp_main;
512 clib_error_t *error = vlib_call_init_function (vm, udp_local_init);
514 clib_error_report (error);
518 um->punt_unknown4 = is_add;
520 um->punt_unknown6 = is_add;
523 /* Parse a UDP header. */
525 unformat_udp_header (unformat_input_t * input, va_list * args)
527 u8 **result = va_arg (*args, u8 **);
529 __attribute__ ((unused)) int old_length;
530 u16 src_port, dst_port;
532 /* Allocate space for IP header. */
536 old_length = vec_len (*result);
537 vec_add2 (*result, p, sizeof (ip4_header_t));
541 clib_memset (udp, 0, sizeof (udp[0]));
542 if (unformat (input, "src-port %d dst-port %d", &src_port, &dst_port))
544 udp->src_port = clib_host_to_net_u16 (src_port);
545 udp->dst_port = clib_host_to_net_u16 (dst_port);
552 udp_setup_node (vlib_main_t * vm, u32 node_index)
554 vlib_node_t *n = vlib_get_node (vm, node_index);
555 pg_node_t *pn = pg_get_node (node_index);
557 n->format_buffer = format_udp_header;
558 n->unformat_buffer = unformat_udp_header;
559 pn->unformat_edit = unformat_pg_udp_header;
563 udp_local_init (vlib_main_t * vm)
565 udp_main_t *um = &udp_main;
570 error = vlib_call_init_function (vm, udp_init);
572 clib_error_report (error);
576 for (i = 0; i < 2; i++)
578 um->dst_port_info_by_name[i] = hash_create_string (0, sizeof (uword));
579 um->dst_port_info_by_dst_port[i] = hash_create (0, sizeof (uword));
582 udp_setup_node (vm, udp4_local_node.index);
583 udp_setup_node (vm, udp6_local_node.index);
585 um->punt_unknown4 = 0;
586 um->punt_unknown6 = 0;
588 um->next_by_dst_port4 = sparse_vec_new
589 ( /* elt bytes */ sizeof (um->next_by_dst_port4[0]),
590 /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
592 um->next_by_dst_port6 = sparse_vec_new
593 ( /* elt bytes */ sizeof (um->next_by_dst_port6[0]),
594 /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
596 #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */);
597 foreach_udp4_dst_port
599 #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */);
600 foreach_udp6_dst_port
602 ip4_register_protocol (IP_PROTOCOL_UDP, udp4_local_node.index);
603 /* Note: ip6 differs from ip4, UDP is hotwired to ip6-udp-lookup */
607 VLIB_INIT_FUNCTION (udp_local_init);
608 #endif /* CLIB_MARCH_VARIANT */
611 * fd.io coding-style-patch-verification: ON
614 * eval: (c-set-style "gnu")