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 static vlib_error_desc_t udp_error_counters[] = {
40 #define udp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
41 #include "udp_error.def"
45 #ifndef CLIB_MARCH_VARIANT
47 format_udp_rx_trace (u8 * s, va_list * args)
49 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
50 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
51 udp_local_rx_trace_t *t = va_arg (*args, udp_local_rx_trace_t *);
53 s = format (s, "UDP: src-port %d dst-port %d%s",
54 clib_net_to_host_u16 (t->src_port),
55 clib_net_to_host_u16 (t->dst_port),
56 t->bound ? "" : " (no listener)");
59 #endif /* CLIB_MARCH_VARIANT */
62 udp_dispatch_error (vlib_node_runtime_t *node, vlib_buffer_t *b, u32 advance,
65 udp_main_t *um = &udp_main;
66 u8 punt_unknown = is_ip4 ? um->punt_unknown4 : um->punt_unknown6;
68 if (PREDICT_FALSE (punt_unknown))
70 vlib_buffer_advance (b, -(word) advance);
71 b->error = node->errors[UDP_ERROR_PUNT];
72 *next = UDP_LOCAL_NEXT_PUNT;
74 else if (um->icmp_send_unreachable_disabled)
76 *next = UDP_LOCAL_NEXT_DROP;
77 b->error = node->errors[UDP_ERROR_NO_LISTENER];
81 /* move the pointer back so icmp-error can find the ip packet header */
82 vlib_buffer_advance (b, -(word) advance);
86 icmp4_error_set_vnet_buffer (
87 b, ICMP4_destination_unreachable,
88 ICMP4_destination_unreachable_port_unreachable, 0);
89 b->error = node->errors[UDP_ERROR_NO_LISTENER];
90 *next = UDP_LOCAL_NEXT_ICMP;
94 icmp6_error_set_vnet_buffer (
95 b, ICMP6_destination_unreachable,
96 ICMP6_destination_unreachable_port_unreachable, 0);
97 b->error = node->errors[UDP_ERROR_NO_LISTENER];
98 *next = UDP_LOCAL_NEXT_ICMP;
104 udp46_local_inline (vlib_main_t * vm,
105 vlib_node_runtime_t * node,
106 vlib_frame_t * from_frame, int is_ip4)
108 udp_main_t *um = &udp_main;
109 __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
110 u16 *next_by_dst_port = (is_ip4 ?
111 um->next_by_dst_port4 : um->next_by_dst_port6);
112 from = vlib_frame_vector_args (from_frame);
113 n_left_from = from_frame->n_vectors;
115 next_index = node->cached_next_index;
117 while (n_left_from > 0)
121 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
123 while (n_left_from >= 4 && n_left_to_next >= 2)
126 vlib_buffer_t *b0, *b1;
127 udp_header_t *h0 = 0, *h1 = 0;
128 u32 i0, i1, dst_port0, dst_port1;
129 u32 advance0, advance1;
130 u32 error0, next0, error1, next1;
132 /* Prefetch next iteration. */
134 vlib_buffer_t *p2, *p3;
136 p2 = vlib_get_buffer (vm, from[2]);
137 p3 = vlib_get_buffer (vm, from[3]);
139 vlib_prefetch_buffer_header (p2, LOAD);
140 vlib_prefetch_buffer_header (p3, LOAD);
142 CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
143 CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
155 b0 = vlib_get_buffer (vm, bi0);
156 b1 = vlib_get_buffer (vm, bi1);
158 /* ip4/6_local hands us the ip header, not the udp header */
161 advance0 = ip4_header_bytes (vlib_buffer_get_current (b0));
162 advance1 = ip4_header_bytes (vlib_buffer_get_current (b1));
166 advance0 = sizeof (ip6_header_t);
167 advance1 = sizeof (ip6_header_t);
170 if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0)))
172 error0 = UDP_ERROR_LENGTH_ERROR;
173 next0 = UDP_LOCAL_NEXT_DROP;
177 vlib_buffer_advance (b0, advance0);
178 h0 = vlib_buffer_get_current (b0);
179 error0 = UDP_ERROR_NONE;
180 next0 = UDP_LOCAL_NEXT_PUNT;
181 if (PREDICT_FALSE (clib_net_to_host_u16 (h0->length) >
182 vlib_buffer_length_in_chain (vm, b0)))
184 error0 = UDP_ERROR_LENGTH_ERROR;
185 next0 = UDP_LOCAL_NEXT_DROP;
189 if (PREDICT_FALSE (b1->current_length < advance1 + sizeof (*h1)))
191 error1 = UDP_ERROR_LENGTH_ERROR;
192 next1 = UDP_LOCAL_NEXT_DROP;
196 vlib_buffer_advance (b1, advance1);
197 h1 = vlib_buffer_get_current (b1);
198 error1 = UDP_ERROR_NONE;
199 next1 = UDP_LOCAL_NEXT_PUNT;
200 if (PREDICT_FALSE (clib_net_to_host_u16 (h1->length) >
201 vlib_buffer_length_in_chain (vm, b1)))
203 error1 = UDP_ERROR_LENGTH_ERROR;
204 next1 = UDP_LOCAL_NEXT_DROP;
208 /* Index sparse array with network byte order. */
209 dst_port0 = (error0 == 0) ? h0->dst_port : 0;
210 dst_port1 = (error1 == 0) ? h1->dst_port : 0;
211 sparse_vec_index2 (next_by_dst_port, dst_port0, dst_port1, &i0,
213 next0 = (error0 == 0) ? vec_elt (next_by_dst_port, i0) : next0;
214 next1 = (error1 == 0) ? vec_elt (next_by_dst_port, i1) : next1;
216 if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX ||
217 next0 == UDP_NO_NODE_SET))
219 udp_dispatch_error (node, b0, advance0, is_ip4, &next0);
223 b0->error = node->errors[UDP_ERROR_NONE];
224 // advance to the payload
225 vlib_buffer_advance (b0, sizeof (*h0));
228 if (PREDICT_FALSE (i1 == SPARSE_VEC_INVALID_INDEX ||
229 next1 == UDP_NO_NODE_SET))
231 udp_dispatch_error (node, b1, advance1, is_ip4, &next1);
235 b1->error = node->errors[UDP_ERROR_NONE];
236 // advance to the payload
237 vlib_buffer_advance (b1, sizeof (*h1));
240 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
242 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
244 if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR])
246 tr->src_port = h0 ? h0->src_port : 0;
247 tr->dst_port = h0 ? h0->dst_port : 0;
248 tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP);
251 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
253 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
255 if (b1->error != node->errors[UDP_ERROR_LENGTH_ERROR])
257 tr->src_port = h1 ? h1->src_port : 0;
258 tr->dst_port = h1 ? h1->dst_port : 0;
259 tr->bound = (next1 != UDP_LOCAL_NEXT_ICMP);
263 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
264 to_next, n_left_to_next,
265 bi0, bi1, next0, next1);
268 while (n_left_from > 0 && n_left_to_next > 0)
272 udp_header_t *h0 = 0;
283 b0 = vlib_get_buffer (vm, bi0);
285 /* ip4/6_local hands us the ip header, not the udp header */
287 advance0 = ip4_header_bytes (vlib_buffer_get_current (b0));
289 advance0 = sizeof (ip6_header_t);
291 if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0)))
293 b0->error = node->errors[UDP_ERROR_LENGTH_ERROR];
294 next0 = UDP_LOCAL_NEXT_DROP;
298 vlib_buffer_advance (b0, advance0);
300 h0 = vlib_buffer_get_current (b0);
302 if (PREDICT_TRUE (clib_net_to_host_u16 (h0->length) <=
303 vlib_buffer_length_in_chain (vm, b0)))
305 i0 = sparse_vec_index (next_by_dst_port, h0->dst_port);
306 next0 = vec_elt (next_by_dst_port, i0);
308 if (PREDICT_FALSE ((i0 == SPARSE_VEC_INVALID_INDEX) ||
309 next0 == UDP_NO_NODE_SET))
311 udp_dispatch_error (node, b0, advance0, is_ip4, &next0);
315 b0->error = node->errors[UDP_ERROR_NONE];
316 // advance to the payload
317 vlib_buffer_advance (b0, sizeof (*h0));
322 b0->error = node->errors[UDP_ERROR_LENGTH_ERROR];
323 next0 = UDP_LOCAL_NEXT_DROP;
327 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
329 udp_local_rx_trace_t *tr = vlib_add_trace (vm, node,
331 if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR])
333 tr->src_port = h0->src_port;
334 tr->dst_port = h0->dst_port;
335 tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP);
339 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
340 to_next, n_left_to_next,
344 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
346 return from_frame->n_vectors;
349 VLIB_NODE_FN (udp4_local_node) (vlib_main_t * vm,
350 vlib_node_runtime_t * node,
351 vlib_frame_t * from_frame)
353 return udp46_local_inline (vm, node, from_frame, 1 /* is_ip4 */ );
356 VLIB_NODE_FN (udp6_local_node) (vlib_main_t * vm,
357 vlib_node_runtime_t * node,
358 vlib_frame_t * from_frame)
360 return udp46_local_inline (vm, node, from_frame, 0 /* is_ip4 */ );
364 VLIB_REGISTER_NODE (udp4_local_node) = {
365 .name = "ip4-udp-lookup",
366 /* Takes a vector of packets. */
367 .vector_size = sizeof (u32),
369 .n_errors = UDP_N_ERROR,
370 .error_counters = udp_error_counters,
372 .n_next_nodes = UDP_LOCAL_N_NEXT,
374 [UDP_LOCAL_NEXT_PUNT]= "ip4-punt",
375 [UDP_LOCAL_NEXT_DROP]= "ip4-drop",
376 [UDP_LOCAL_NEXT_ICMP]= "ip4-icmp-error",
379 .format_buffer = format_udp_header,
380 .format_trace = format_udp_rx_trace,
381 .unformat_buffer = unformat_udp_header,
386 VLIB_REGISTER_NODE (udp6_local_node) = {
387 .name = "ip6-udp-lookup",
388 /* Takes a vector of packets. */
389 .vector_size = sizeof (u32),
391 .n_errors = UDP_N_ERROR,
392 .error_counters = udp_error_counters,
394 .n_next_nodes = UDP_LOCAL_N_NEXT,
396 [UDP_LOCAL_NEXT_PUNT]= "ip6-punt",
397 [UDP_LOCAL_NEXT_DROP]= "ip6-drop",
398 [UDP_LOCAL_NEXT_ICMP]= "ip6-icmp-error",
401 .format_buffer = format_udp_header,
402 .format_trace = format_udp_rx_trace,
403 .unformat_buffer = unformat_udp_header,
407 #ifndef CLIB_MARCH_VARIANT
409 udp_add_dst_port (udp_main_t * um, udp_dst_port_t dst_port,
410 char *dst_port_name, u8 is_ip4)
412 udp_dst_port_info_t *pi;
415 vec_add2 (um->dst_port_infos[is_ip4], pi, 1);
416 i = pi - um->dst_port_infos[is_ip4];
418 pi->name = dst_port_name;
419 pi->dst_port = dst_port;
420 pi->next_index = pi->node_index = ~0;
422 hash_set (um->dst_port_info_by_dst_port[is_ip4], dst_port, i);
425 hash_set_mem (um->dst_port_info_by_name[is_ip4], pi->name, i);
429 udp_register_dst_port (vlib_main_t * vm,
430 udp_dst_port_t dst_port, u32 node_index, u8 is_ip4)
432 udp_main_t *um = &udp_main;
433 udp_dst_port_info_t *pi;
437 clib_error_t *error = vlib_call_init_function (vm, udp_local_init);
439 clib_error_report (error);
442 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
445 udp_add_dst_port (um, dst_port, 0, is_ip4);
446 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
450 pi->node_index = node_index;
451 pi->next_index = vlib_node_add_next (vm,
452 is_ip4 ? udp4_local_node.index
453 : udp6_local_node.index, node_index);
455 /* Setup udp protocol -> next index sparse vector mapping. */
457 n = sparse_vec_validate (um->next_by_dst_port4,
458 clib_host_to_net_u16 (dst_port));
460 n = sparse_vec_validate (um->next_by_dst_port6,
461 clib_host_to_net_u16 (dst_port));
463 n[0] = pi->next_index;
467 udp_unregister_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u8 is_ip4)
469 udp_main_t *um = &udp_main;
470 udp_dst_port_info_t *pi;
473 pi = udp_get_dst_port_info (um, dst_port, is_ip4);
474 /* Not registered? Fagedaboudit */
478 /* Kill the mapping. Don't bother killing the pi, it may be back. */
480 n = sparse_vec_validate (um->next_by_dst_port4,
481 clib_host_to_net_u16 (dst_port));
483 n = sparse_vec_validate (um->next_by_dst_port6,
484 clib_host_to_net_u16 (dst_port));
486 n[0] = UDP_NO_NODE_SET;
490 udp_is_valid_dst_port (udp_dst_port_t dst_port, u8 is_ip4)
492 udp_main_t *um = &udp_main;
496 n = sparse_vec_validate (um->next_by_dst_port4,
497 clib_host_to_net_u16 (dst_port));
499 n = sparse_vec_validate (um->next_by_dst_port6,
500 clib_host_to_net_u16 (dst_port));
502 return (n[0] != SPARSE_VEC_INVALID_INDEX && n[0] != UDP_NO_NODE_SET);
506 udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
508 udp_main_t *um = &udp_main;
510 clib_error_t *error = vlib_call_init_function (vm, udp_local_init);
512 clib_error_report (error);
516 um->punt_unknown4 = is_add;
518 um->punt_unknown6 = is_add;
521 /* Parse a UDP header. */
523 unformat_udp_header (unformat_input_t * input, va_list * args)
525 u8 **result = va_arg (*args, u8 **);
527 __attribute__ ((unused)) int old_length;
528 u16 src_port, dst_port;
530 /* Allocate space for IP header. */
534 old_length = vec_len (*result);
535 vec_add2 (*result, p, sizeof (ip4_header_t));
539 clib_memset (udp, 0, sizeof (udp[0]));
540 if (unformat (input, "src-port %d dst-port %d", &src_port, &dst_port))
542 udp->src_port = clib_host_to_net_u16 (src_port);
543 udp->dst_port = clib_host_to_net_u16 (dst_port);
550 udp_setup_node (vlib_main_t * vm, u32 node_index)
552 vlib_node_t *n = vlib_get_node (vm, node_index);
553 pg_node_t *pn = pg_get_node (node_index);
555 n->format_buffer = format_udp_header;
556 n->unformat_buffer = unformat_udp_header;
557 pn->unformat_edit = unformat_pg_udp_header;
561 udp_local_init (vlib_main_t * vm)
563 udp_main_t *um = &udp_main;
568 error = vlib_call_init_function (vm, udp_init);
570 clib_error_report (error);
574 for (i = 0; i < 2; i++)
576 um->dst_port_info_by_name[i] = hash_create_string (0, sizeof (uword));
577 um->dst_port_info_by_dst_port[i] = hash_create (0, sizeof (uword));
580 udp_setup_node (vm, udp4_local_node.index);
581 udp_setup_node (vm, udp6_local_node.index);
583 um->punt_unknown4 = 0;
584 um->punt_unknown6 = 0;
586 um->next_by_dst_port4 = sparse_vec_new
587 ( /* elt bytes */ sizeof (um->next_by_dst_port4[0]),
588 /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
590 um->next_by_dst_port6 = sparse_vec_new
591 ( /* elt bytes */ sizeof (um->next_by_dst_port6[0]),
592 /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
594 #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */);
595 foreach_udp4_dst_port
597 #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */);
598 foreach_udp6_dst_port
600 ip4_register_protocol (IP_PROTOCOL_UDP, udp4_local_node.index);
601 /* Note: ip6 differs from ip4, UDP is hotwired to ip6-udp-lookup */
605 VLIB_INIT_FUNCTION (udp_local_init);
606 #endif /* CLIB_MARCH_VARIANT */
609 * fd.io coding-style-patch-verification: ON
612 * eval: (c-set-style "gnu")