2 * Copyright (c) 2015 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.
16 * ip/ip_lookup.c: ip4/6 adjacency and lookup table managment
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/ip/ip.h>
41 #include <vnet/adj/adj.h>
42 #include <vnet/fib/fib_table.h>
43 #include <vnet/fib/ip4_fib.h>
44 #include <vnet/fib/ip6_fib.h>
45 #include <vnet/mpls/mpls.h>
46 #include <vnet/dpo/drop_dpo.h>
47 #include <vnet/dpo/classify_dpo.h>
48 #include <vnet/dpo/punt_dpo.h>
49 #include <vnet/dpo/receive_dpo.h>
50 #include <vnet/dpo/ip_null_dpo.h>
54 * @brief IPv4 and IPv6 adjacency and lookup table managment.
59 ip_interface_address_add_del (ip_lookup_main_t * lm,
64 u32 * result_if_address_index)
66 vnet_main_t * vnm = vnet_get_main();
67 ip_interface_address_t * a, * prev, * next;
68 uword * p = mhash_get (&lm->address_to_if_address_index, addr_fib);
70 vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
71 a = p ? pool_elt_at_index (lm->if_address_pool, p[0]) : 0;
73 /* Verify given length. */
74 if ((a && (address_length != a->address_length)) || (address_length == 0))
76 vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
77 return clib_error_create
78 ( "%U wrong length (expected %d) for interface %U",
79 lm->format_address_and_length, addr_fib,
80 address_length, a? a->address_length : -1,
81 format_vnet_sw_if_index_name, vnm, sw_if_index);
88 vnet_sw_interface_t * si = vnet_get_sw_interface (vnm, sw_if_index);
89 vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
90 return clib_error_create ("%U not found for interface %U",
91 lm->format_address_and_length,
92 addr_fib, address_length,
93 format_vnet_sw_interface_name, vnm, si);
96 if (a->prev_this_sw_interface != ~0)
98 prev = pool_elt_at_index (lm->if_address_pool, a->prev_this_sw_interface);
99 prev->next_this_sw_interface = a->next_this_sw_interface;
101 if (a->next_this_sw_interface != ~0)
103 next = pool_elt_at_index (lm->if_address_pool, a->next_this_sw_interface);
104 next->prev_this_sw_interface = a->prev_this_sw_interface;
106 if(a->prev_this_sw_interface == ~0)
107 lm->if_address_pool_index_by_sw_if_index[sw_if_index] = a->next_this_sw_interface;
110 if ((a->next_this_sw_interface == ~0) && (a->prev_this_sw_interface == ~0))
111 lm->if_address_pool_index_by_sw_if_index[sw_if_index] = ~0;
113 mhash_unset (&lm->address_to_if_address_index, addr_fib,
115 pool_put (lm->if_address_pool, a);
117 if (result_if_address_index)
118 *result_if_address_index = ~0;
123 u32 pi; /* previous index */
125 u32 hi; /* head index */
127 pool_get (lm->if_address_pool, a);
128 memset (a, ~0, sizeof (a[0]));
129 ai = a - lm->if_address_pool;
131 hi = pi = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
133 while (pi != (u32)~0)
135 prev = pool_elt_at_index(lm->if_address_pool, pi);
136 pi = prev->next_this_sw_interface;
138 pi = prev ? prev - lm->if_address_pool : (u32)~0;
140 a->address_key = mhash_set (&lm->address_to_if_address_index,
141 addr_fib, ai, /* old_value */ 0);
142 a->address_length = address_length;
143 a->sw_if_index = sw_if_index;
145 a->prev_this_sw_interface = pi;
146 a->next_this_sw_interface = ~0;
148 prev->next_this_sw_interface = ai;
150 lm->if_address_pool_index_by_sw_if_index[sw_if_index] =
151 (hi != ~0) ? hi : ai;
152 if (result_if_address_index)
153 *result_if_address_index = ai;
157 if (result_if_address_index)
158 *result_if_address_index = a - lm->if_address_pool;
162 return /* no error */ 0;
165 void ip_lookup_init (ip_lookup_main_t * lm, u32 is_ip6)
167 /* ensure that adjacency is cacheline aligned and sized */
168 STATIC_ASSERT(STRUCT_OFFSET_OF(ip_adjacency_t, cacheline0) == 0,
169 "Cache line marker must be 1st element in struct");
170 STATIC_ASSERT(STRUCT_OFFSET_OF(ip_adjacency_t, cacheline1) == CLIB_CACHE_LINE_BYTES,
171 "Data in cache line 0 is bigger than cache line size");
173 /* Preallocate three "special" adjacencies */
174 lm->adjacency_heap = adj_pool;
176 if (! lm->fib_result_n_bytes)
177 lm->fib_result_n_bytes = sizeof (uword);
182 lm->format_address_and_length = format_ip6_address_and_length;
183 mhash_init (&lm->address_to_if_address_index, sizeof (uword),
184 sizeof (ip6_address_fib_t));
188 lm->format_address_and_length = format_ip4_address_and_length;
189 mhash_init (&lm->address_to_if_address_index, sizeof (uword),
190 sizeof (ip4_address_fib_t));
196 /* Setup all IP protocols to be punted and builtin-unknown. */
197 for (i = 0; i < 256; i++)
199 lm->local_next_by_ip_protocol[i] = IP_LOCAL_NEXT_PUNT;
200 lm->builtin_protocol_by_ip_protocol[i] = IP_BUILTIN_PROTOCOL_UNKNOWN;
203 lm->local_next_by_ip_protocol[IP_PROTOCOL_UDP] = IP_LOCAL_NEXT_UDP_LOOKUP;
204 lm->local_next_by_ip_protocol[is_ip6 ? IP_PROTOCOL_ICMP6 : IP_PROTOCOL_ICMP] = IP_LOCAL_NEXT_ICMP;
205 lm->builtin_protocol_by_ip_protocol[IP_PROTOCOL_UDP] = IP_BUILTIN_PROTOCOL_UDP;
206 lm->builtin_protocol_by_ip_protocol[is_ip6 ? IP_PROTOCOL_ICMP6 : IP_PROTOCOL_ICMP] = IP_BUILTIN_PROTOCOL_ICMP;
210 u8 * format_ip_flow_hash_config (u8 * s, va_list * args)
212 flow_hash_config_t flow_hash_config = va_arg (*args, u32);
214 #define _(n,v) if (flow_hash_config & v) s = format (s, "%s ", #n);
215 foreach_flow_hash_bit;
221 u8 * format_ip_lookup_next (u8 * s, va_list * args)
223 ip_lookup_next_t n = va_arg (*args, ip_lookup_next_t);
229 s = format (s, "unknown %d", n);
232 case IP_LOOKUP_NEXT_DROP: t = "drop"; break;
233 case IP_LOOKUP_NEXT_PUNT: t = "punt"; break;
234 case IP_LOOKUP_NEXT_ARP: t = "arp"; break;
235 case IP_LOOKUP_NEXT_MIDCHAIN: t="midchain"; break;
236 case IP_LOOKUP_NEXT_GLEAN: t="glean"; break;
237 case IP_LOOKUP_NEXT_REWRITE:
242 vec_add (s, t, strlen (t));
247 u8 * format_ip_adjacency_packet_data (u8 * s, va_list * args)
249 vnet_main_t * vnm = va_arg (*args, vnet_main_t *);
250 u32 adj_index = va_arg (*args, u32);
251 u8 * packet_data = va_arg (*args, u8 *);
252 u32 n_packet_data_bytes = va_arg (*args, u32);
253 ip_adjacency_t * adj = adj_get(adj_index);
255 switch (adj->lookup_next_index)
257 case IP_LOOKUP_NEXT_REWRITE:
259 format_vnet_rewrite_header,
260 vnm->vlib_main, &adj->rewrite_header, packet_data, n_packet_data_bytes);
270 static uword unformat_dpo (unformat_input_t * input, va_list * args)
272 dpo_id_t *dpo = va_arg (*args, dpo_id_t *);
273 fib_protocol_t fp = va_arg (*args, int);
276 proto = fib_proto_to_dpo(fp);
278 if (unformat (input, "drop"))
279 dpo_copy(dpo, drop_dpo_get(proto));
280 else if (unformat (input, "punt"))
281 dpo_copy(dpo, punt_dpo_get(proto));
282 else if (unformat (input, "local"))
283 receive_dpo_add_or_lock(proto, ~0, NULL, dpo);
284 else if (unformat (input, "null-send-unreach"))
285 ip_null_dpo_add_and_lock(proto, IP_NULL_ACTION_SEND_ICMP_UNREACH, dpo);
286 else if (unformat (input, "null-send-prohibit"))
287 ip_null_dpo_add_and_lock(proto, IP_NULL_ACTION_SEND_ICMP_PROHIBIT, dpo);
288 else if (unformat (input, "null"))
289 ip_null_dpo_add_and_lock(proto, IP_NULL_ACTION_NONE, dpo);
290 else if (unformat (input, "classify"))
292 u32 classify_table_index;
294 if (!unformat (input, "%d", &classify_table_index))
296 clib_warning ("classify adj must specify table index");
300 dpo_set(dpo, DPO_CLASSIFY, proto,
301 classify_dpo_create(proto, classify_table_index));
309 const ip46_address_t zero_addr = {
316 fib_table_id_find_fib_index (fib_protocol_t proto,
319 ip4_main_t *im4 = &ip4_main;
320 ip6_main_t *im6 = &ip6_main;
325 case FIB_PROTOCOL_IP4:
326 p = hash_get(im4->fib_index_by_table_id, table_id);
328 case FIB_PROTOCOL_IP6:
329 p = hash_get(im6->fib_index_by_table_id, table_id);
343 vnet_ip_route_cmd (vlib_main_t * vm,
344 unformat_input_t * main_input,
345 vlib_cli_command_t * cmd)
347 unformat_input_t _line_input, * line_input = &_line_input;
348 fib_route_path_t *rpaths = NULL, rpath;
349 dpo_id_t dpo = DPO_INVALID, *dpos = NULL;
350 fib_prefix_t *prefixs = NULL, pfx;
351 mpls_label_t out_label, via_label;
352 clib_error_t * error = NULL;
353 u32 table_id, is_del;
359 vnm = vnet_get_main();
363 memset(&pfx, 0, sizeof(pfx));
364 out_label = via_label = MPLS_LABEL_INVALID;
366 /* Get a line of input. */
367 if (! unformat_user (main_input, unformat_line_input, line_input))
370 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
372 memset(&rpath, 0, sizeof(rpath));
374 if (unformat (line_input, "table %d", &table_id))
376 else if (unformat (line_input, "del"))
378 else if (unformat (line_input, "add"))
380 else if (unformat (line_input, "resolve-via-host"))
382 if (vec_len(rpaths) == 0)
384 error = clib_error_return(0 , "Paths then flags");
387 rpaths[vec_len(rpaths)-1].frp_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_HOST;
389 else if (unformat (line_input, "resolve-via-attached"))
391 if (vec_len(rpaths) == 0)
393 error = clib_error_return(0 , "Paths then flags");
396 rpaths[vec_len(rpaths)-1].frp_flags |=
397 FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED;
399 else if (unformat (line_input, "out-label %U",
400 unformat_mpls_unicast_label, &out_label))
402 if (vec_len(rpaths) == 0)
404 error = clib_error_return(0 , "Paths then labels");
407 vec_add1(rpaths[vec_len(rpaths)-1].frp_label_stack, out_label);
409 else if (unformat (line_input, "via-label %U",
410 unformat_mpls_unicast_label,
411 &rpath.frp_local_label))
413 rpath.frp_weight = 1;
414 rpath.frp_proto = FIB_PROTOCOL_MPLS;
415 rpath.frp_sw_if_index = ~0;
416 vec_add1(rpaths, rpath);
418 else if (unformat (line_input, "count %f", &count))
421 else if (unformat (line_input, "%U/%d",
422 unformat_ip4_address,
426 pfx.fp_proto = FIB_PROTOCOL_IP4;
427 vec_add1(prefixs, pfx);
429 else if (unformat (line_input, "%U/%d",
430 unformat_ip6_address,
434 pfx.fp_proto = FIB_PROTOCOL_IP6;
435 vec_add1(prefixs, pfx);
437 else if (unformat (line_input, "via %U %U weight %u",
438 unformat_ip4_address,
440 unformat_vnet_sw_interface, vnm,
441 &rpath.frp_sw_if_index,
444 rpath.frp_proto = FIB_PROTOCOL_IP4;
445 vec_add1(rpaths, rpath);
448 else if (unformat (line_input, "via %U %U weight %u",
449 unformat_ip6_address,
451 unformat_vnet_sw_interface, vnm,
452 &rpath.frp_sw_if_index,
455 rpath.frp_proto = FIB_PROTOCOL_IP6;
456 vec_add1(rpaths, rpath);
459 else if (unformat (line_input, "via %U %U",
460 unformat_ip4_address,
462 unformat_vnet_sw_interface, vnm,
463 &rpath.frp_sw_if_index))
465 rpath.frp_weight = 1;
466 rpath.frp_proto = FIB_PROTOCOL_IP4;
467 vec_add1(rpaths, rpath);
470 else if (unformat (line_input, "via %U %U",
471 unformat_ip6_address,
473 unformat_vnet_sw_interface, vnm,
474 &rpath.frp_sw_if_index))
476 rpath.frp_weight = 1;
477 rpath.frp_proto = FIB_PROTOCOL_IP6;
478 vec_add1(rpaths, rpath);
480 else if (unformat (line_input, "via %U next-hop-table %d",
481 unformat_ip4_address,
483 &rpath.frp_fib_index))
485 rpath.frp_weight = 1;
486 rpath.frp_sw_if_index = ~0;
487 rpath.frp_proto = FIB_PROTOCOL_IP4;
488 vec_add1(rpaths, rpath);
490 else if (unformat (line_input, "via %U next-hop-table %d",
491 unformat_ip6_address,
493 &rpath.frp_fib_index))
495 rpath.frp_weight = 1;
496 rpath.frp_sw_if_index = ~0;
497 rpath.frp_proto = FIB_PROTOCOL_IP6;
498 vec_add1(rpaths, rpath);
500 else if (unformat (line_input, "via %U",
501 unformat_ip4_address,
502 &rpath.frp_addr.ip4))
505 * the recursive next-hops are by default in the same table
508 rpath.frp_fib_index = table_id;
509 rpath.frp_weight = 1;
510 rpath.frp_sw_if_index = ~0;
511 rpath.frp_proto = FIB_PROTOCOL_IP4;
512 vec_add1(rpaths, rpath);
514 else if (unformat (line_input, "via %U",
515 unformat_ip6_address,
516 &rpath.frp_addr.ip6))
518 rpath.frp_fib_index = table_id;
519 rpath.frp_weight = 1;
520 rpath.frp_sw_if_index = ~0;
521 rpath.frp_proto = FIB_PROTOCOL_IP6;
522 vec_add1(rpaths, rpath);
524 else if (unformat (line_input,
525 "lookup in table %d",
526 &rpath.frp_fib_index))
528 rpath.frp_proto = pfx.fp_proto;
529 rpath.frp_sw_if_index = ~0;
530 vec_add1(rpaths, rpath);
532 else if (vec_len (prefixs) > 0 &&
533 unformat (line_input, "via %U",
534 unformat_dpo, &dpo, prefixs[0].fp_proto))
536 vec_add1 (dpos, dpo);
540 error = unformat_parse_error (line_input);
545 unformat_free (line_input);
547 if (vec_len (prefixs) == 0)
549 error = clib_error_return (0, "expected ip4/ip6 destination address/length.");
553 if (!is_del && vec_len (rpaths) + vec_len (dpos) == 0)
555 error = clib_error_return (0, "expected paths.");
562 * if no table_id is passed we will manipulate the default
568 fib_index = fib_table_id_find_fib_index(prefixs[0].fp_proto,
573 error = clib_error_return (0,
574 "Nonexistent table id %d",
580 for (i = 0; i < vec_len (prefixs); i++)
582 if (is_del && 0 == vec_len (rpaths))
584 fib_table_entry_delete(fib_index,
588 else if (!is_del && 1 == vec_len (dpos))
590 fib_table_entry_special_dpo_add(fib_index,
593 FIB_ENTRY_FLAG_EXCLUSIVE,
597 else if (vec_len (dpos) > 0)
599 error = clib_error_return(0 , "Load-balancing over multiple special adjacencies is unsupported");
602 else if (0 < vec_len (rpaths))
605 ip46_address_t dst = prefixs[i].fp_addr;
608 t[0] = vlib_time_now (vm);
609 incr = 1 << ((FIB_PROTOCOL_IP4 == prefixs[0].fp_proto ? 32 : 128) -
612 for (k = 0; k < n; k++)
614 for (j = 0; j < vec_len (rpaths); j++)
618 * the CLI parsing stored table Ids, swap to FIB indicies
620 fi = fib_table_id_find_fib_index(prefixs[i].fp_proto,
621 rpaths[i].frp_fib_index);
625 error = clib_error_return(0 , "Via table %d does not exist",
626 rpaths[i].frp_fib_index);
629 rpaths[i].frp_fib_index = fi;
631 fib_prefix_t rpfx = {
632 .fp_len = prefixs[i].fp_len,
633 .fp_proto = prefixs[i].fp_proto,
638 fib_table_entry_path_remove2(fib_index,
643 fib_table_entry_path_add2(fib_index,
650 if (FIB_PROTOCOL_IP4 == prefixs[0].fp_proto)
653 clib_host_to_net_u32(incr +
654 clib_net_to_host_u32 (dst.ip4.as_u32));
658 int bucket = (incr < 64 ? 0 : 1);
659 dst.ip6.as_u64[bucket] =
660 clib_host_to_net_u64(incr +
661 clib_net_to_host_u64 (
662 dst.ip6.as_u64[bucket]));
666 t[1] = vlib_time_now (vm);
668 vlib_cli_output (vm, "%.6e routes/sec", count / (t[1] - t[0]));
672 error = clib_error_return(0 , "Don't understand what you want...");
685 VLIB_CLI_COMMAND (vlib_cli_ip_command, static) = {
687 .short_help = "Internet protocol (IP) commands",
690 VLIB_CLI_COMMAND (vlib_cli_ip6_command, static) = {
692 .short_help = "Internet protocol version 6 (IPv6) commands",
695 VLIB_CLI_COMMAND (vlib_cli_show_ip_command, static) = {
697 .short_help = "Internet protocol (IP) show commands",
700 VLIB_CLI_COMMAND (vlib_cli_show_ip6_command, static) = {
702 .short_help = "Internet protocol version 6 (IPv6) show commands",
706 * This command is used to add or delete IPv4 or IPv6 routes. All
707 * IP Addresses ('<em><dst-ip-addr>/<width></em>',
708 * '<em><next-hop-ip-addr></em>' and '<em><adj-hop-ip-addr></em>')
709 * can be IPv4 or IPv6, but all must be of the same form in a single
710 * command. To display the current set of routes, use the commands
711 * '<em>show ip fib</em>' and '<em>show ip6 fib</em>'.
714 * Example of how to add a straight forward static route:
715 * @cliexcmd{ip route add 6.0.1.2/32 via 6.0.0.1 GigabitEthernet2/0/0}
716 * Example of how to delete a straight forward static route:
717 * @cliexcmd{ip route del 6.0.1.2/32 via 6.0.0.1 GigabitEthernet2/0/0}
718 * Mainly for route add/del performance testing, one can add or delete
719 * multiple routes by adding 'count N' to the previous item:
720 * @cliexcmd{ip route add count 10 7.0.0.0/24 via 6.0.0.1 GigabitEthernet2/0/0}
721 * Add multiple routes for the same destination to create equal-cost multipath:
722 * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.1 GigabitEthernet2/0/0}
723 * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.2 GigabitEthernet2/0/0}
724 * For unequal-cost multipath, specify the desired weights. This
725 * combination of weights results in 3/4 of the traffic following the
726 * second path, 1/4 following the first path:
727 * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.1 GigabitEthernet2/0/0 weight 1}
728 * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.2 GigabitEthernet2/0/0 weight 3}
729 * To add a route to a particular FIB table (VRF), use:
730 * @cliexcmd{ip route add 172.16.24.0/24 table 7 via GigabitEthernet2/0/0}
733 VLIB_CLI_COMMAND (ip_route_command, static) = {
735 .short_help = "ip route [add|del] [count <n>] <dst-ip-addr>/<width> [table <table-id>] [via <next-hop-ip-addr> [<interface>] [weight <weight>]] | [via arp <interface> <adj-hop-ip-addr>] | [via drop|punt|local<id>|arp|classify <classify-idx>] [lookup in table <out-table-id>]",
736 .function = vnet_ip_route_cmd,
742 * The next two routines address a longstanding script hemorrhoid.
743 * Probing a v4 or v6 neighbor needs to appear to be synchronous,
744 * or dependent route-adds will simply fail.
746 static clib_error_t *
747 ip6_probe_neighbor_wait (vlib_main_t *vm, ip6_address_t * a, u32 sw_if_index,
750 vnet_main_t * vnm = vnet_get_main();
755 uword *event_data = 0;
757 ASSERT (vlib_in_process_context(vm));
760 vnet_register_ip6_neighbor_resolution_event
761 (vnm, a, vlib_get_current_process (vm)->node_runtime.node_index,
762 1 /* event */, 0 /* data */);
764 for (i = 0; i < retry_count; i++)
766 /* The interface may be down, etc. */
767 e = ip6_probe_neighbor (vm, a, sw_if_index);
772 vlib_process_wait_for_event_or_clock (vm, 1.0);
773 event_type = vlib_process_get_events (vm, &event_data);
776 case 1: /* resolved... */
777 vlib_cli_output (vm, "Resolved %U",
778 format_ip6_address, a);
782 case ~0: /* timeout */
786 clib_warning ("unknown event_type %d", event_type);
788 vec_reset_length (event_data);
794 return clib_error_return (0, "Resolution failed for %U",
795 format_ip6_address, a);
799 static clib_error_t *
800 ip4_probe_neighbor_wait (vlib_main_t *vm, ip4_address_t * a, u32 sw_if_index,
803 vnet_main_t * vnm = vnet_get_main();
808 uword *event_data = 0;
810 ASSERT (vlib_in_process_context(vm));
813 vnet_register_ip4_arp_resolution_event
814 (vnm, a, vlib_get_current_process (vm)->node_runtime.node_index,
815 1 /* event */, 0 /* data */);
817 for (i = 0; i < retry_count; i++)
819 /* The interface may be down, etc. */
820 e = ip4_probe_neighbor (vm, a, sw_if_index);
825 vlib_process_wait_for_event_or_clock (vm, 1.0);
826 event_type = vlib_process_get_events (vm, &event_data);
829 case 1: /* resolved... */
830 vlib_cli_output (vm, "Resolved %U",
831 format_ip4_address, a);
835 case ~0: /* timeout */
839 clib_warning ("unknown event_type %d", event_type);
841 vec_reset_length (event_data);
846 vec_reset_length (event_data);
849 return clib_error_return (0, "Resolution failed for %U",
850 format_ip4_address, a);
854 static clib_error_t *
855 probe_neighbor_address (vlib_main_t * vm,
856 unformat_input_t * input,
857 vlib_cli_command_t * cmd)
859 vnet_main_t * vnm = vnet_get_main();
860 unformat_input_t _line_input, * line_input = &_line_input;
863 clib_error_t * error = 0;
864 u32 sw_if_index = ~0;
869 /* Get a line of input. */
870 if (! unformat_user (input, unformat_line_input, line_input))
873 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
875 if (unformat_user (line_input, unformat_vnet_sw_interface, vnm,
878 else if (unformat (line_input, "retry %d", &retry_count))
881 else if (unformat (line_input, "%U", unformat_ip4_address, &a4))
883 else if (unformat (line_input, "%U", unformat_ip6_address, &a6))
889 return clib_error_return (0, "unknown input '%U'",
890 format_unformat_error, line_input);
893 unformat_free (line_input);
895 if (sw_if_index == ~0)
896 return clib_error_return (0, "Interface required, not set.");
897 if (address_set == 0)
898 return clib_error_return (0, "ip address required, not set.");
900 return clib_error_return (0, "Multiple ip addresses not supported.");
903 error = ip4_probe_neighbor_wait (vm, &a4, sw_if_index, retry_count);
905 error = ip6_probe_neighbor_wait (vm, &a6, sw_if_index, retry_count);
911 * The '<em>ip probe-neighbor</em>' command ARPs for IPv4 addresses or
912 * attempts IPv6 neighbor discovery depending on the supplied IP address
915 * @note This command will not immediately affect the indicated FIB; it
916 * is not suitable for use in establishing a FIB entry prior to adding
917 * recursive FIB entries. As in: don't use it in a script to probe a
918 * gateway prior to adding a default route. It won't work. Instead,
919 * configure a static ARP cache entry [see '<em>set ip arp</em>'], or
920 * a static IPv6 neighbor [see '<em>set ip6 neighbor</em>'].
923 * Example of probe for an IPv4 address:
924 * @cliexcmd{ip probe-neighbor GigabitEthernet2/0/0 172.16.1.2}
927 VLIB_CLI_COMMAND (ip_probe_neighbor_command, static) = {
928 .path = "ip probe-neighbor",
929 .function = probe_neighbor_address,
930 .short_help = "ip probe-neighbor <interface> <ip4-addr> | <ip6-addr> [retry nn]",