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Ed Warnickecb9cada2015-12-08 15:45:58 -07001/*
2 * ethernet/arp.c: IP v4 ARP node
3 *
4 * Copyright (c) 2010 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:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
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.
16 */
17
18#include <vnet/ip/ip.h>
John Lo1edfba92016-08-27 01:11:57 -040019#include <vnet/ip/ip6.h>
Ed Warnickecb9cada2015-12-08 15:45:58 -070020#include <vnet/ethernet/ethernet.h>
Neale Ranns0053de62018-05-22 08:40:52 -070021#include <vnet/ethernet/arp.h>
Ed Warnickecb9cada2015-12-08 15:45:58 -070022#include <vnet/l2/l2_input.h>
23#include <vppinfra/mhash.h>
Neale Ranns0bfe5d82016-08-25 15:29:12 +010024#include <vnet/fib/ip4_fib.h>
Neale Rannsca193612017-06-14 06:50:08 -070025#include <vnet/fib/fib_entry_src.h>
Neale Rannsb80c5362016-10-08 13:03:40 +010026#include <vnet/adj/adj_nbr.h>
Neale Ranns32e1c012016-11-22 17:07:28 +000027#include <vnet/adj/adj_mcast.h>
Neale Ranns0bfe5d82016-08-25 15:29:12 +010028#include <vnet/mpls/mpls.h>
Neale Ranns3b81a1e2018-09-06 09:50:26 -070029#include <vnet/l2/feat_bitmap.h>
Ed Warnickecb9cada2015-12-08 15:45:58 -070030
Billy McFall2d085d92016-09-13 21:47:55 -040031/**
32 * @file
33 * @brief IPv4 ARP.
34 *
35 * This file contains code to manage the IPv4 ARP tables (IP Address
36 * to MAC Address lookup).
37 */
38
39
Dave Barachf9bd6202015-12-14 13:22:11 -050040void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
41
Neale Ranns0bfe5d82016-08-25 15:29:12 +010042/**
43 * @brief Per-interface ARP configuration and state
44 */
45typedef struct ethernet_arp_interface_t_
46{
Neale Rannsb80c5362016-10-08 13:03:40 +010047 /**
48 * Hash table of ARP entries.
49 * Since this hash table is per-interface, the key is only the IPv4 address.
50 */
Neale Ranns0bfe5d82016-08-25 15:29:12 +010051 uword *arp_entries;
Neale Ranns0bfe5d82016-08-25 15:29:12 +010052} ethernet_arp_interface_t;
53
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070054typedef struct
55{
Neale Ranns0053de62018-05-22 08:40:52 -070056 ip4_address_t lo_addr;
57 ip4_address_t hi_addr;
Ed Warnickecb9cada2015-12-08 15:45:58 -070058 u32 fib_index;
59} ethernet_proxy_arp_t;
60
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070061typedef struct
62{
Ed Warnickecb9cada2015-12-08 15:45:58 -070063 u32 next_index;
64 uword node_index;
65 uword type_opaque;
66 uword data;
67 /* Used for arp event notification only */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070068 void *data_callback;
Ed Warnickecb9cada2015-12-08 15:45:58 -070069 u32 pid;
70} pending_resolution_t;
71
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070072typedef struct
73{
Ed Warnickecb9cada2015-12-08 15:45:58 -070074 /* Hash tables mapping name to opcode. */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070075 uword *opcode_by_name;
Ed Warnickecb9cada2015-12-08 15:45:58 -070076
77 /* lite beer "glean" adjacency handling */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070078 uword *pending_resolutions_by_address;
79 pending_resolution_t *pending_resolutions;
Ed Warnickecb9cada2015-12-08 15:45:58 -070080
81 /* Mac address change notification */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070082 uword *mac_changes_by_address;
83 pending_resolution_t *mac_changes;
Ed Warnickecb9cada2015-12-08 15:45:58 -070084
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070085 ethernet_arp_ip4_entry_t *ip4_entry_pool;
Ed Warnickecb9cada2015-12-08 15:45:58 -070086
Ed Warnickecb9cada2015-12-08 15:45:58 -070087 /* ARP attack mitigation */
88 u32 arp_delete_rotor;
89 u32 limit_arp_cache_size;
90
Neale Ranns0bfe5d82016-08-25 15:29:12 +010091 /** Per interface state */
92 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
93
Ed Warnickecb9cada2015-12-08 15:45:58 -070094 /* Proxy arp vector */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -070095 ethernet_proxy_arp_t *proxy_arps;
Eyal Bari20197482017-09-13 12:29:08 +030096
97 uword wc_ip4_arp_publisher_node;
Eyal Baric125ecc2017-09-20 11:29:17 +030098 uword wc_ip4_arp_publisher_et;
Ed Warnickecb9cada2015-12-08 15:45:58 -070099} ethernet_arp_main_t;
100
101static ethernet_arp_main_t ethernet_arp_main;
102
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100103typedef struct
104{
105 u32 sw_if_index;
106 ethernet_arp_ip4_over_ethernet_address_t a;
107 int is_static;
Neale Rannsb3b2de72017-03-08 05:17:22 -0800108 int is_no_fib_entry;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100109 int flags;
110#define ETHERNET_ARP_ARGS_REMOVE (1<<0)
111#define ETHERNET_ARP_ARGS_FLUSH (1<<1)
112#define ETHERNET_ARP_ARGS_POPULATE (1<<2)
Eyal Bari20197482017-09-13 12:29:08 +0300113#define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100114} vnet_arp_set_ip4_over_ethernet_rpc_args_t;
115
Matthew Smithcb9ab472017-05-16 21:35:56 -0500116static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
117
John Lo8b81cb42017-06-26 01:40:20 -0400118/* Node index for send_garp_na_process */
119u32 send_garp_na_process_node_index;
120
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100121static void
122set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
123 * a);
124
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700125static u8 *
126format_ethernet_arp_hardware_type (u8 * s, va_list * va)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700127{
128 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700129 char *t = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700130 switch (h)
131 {
132#define _(n,f) case n: t = #f; break;
133 foreach_ethernet_arp_hardware_type;
134#undef _
135
136 default:
137 return format (s, "unknown 0x%x", h);
138 }
139
140 return format (s, "%s", t);
141}
142
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700143static u8 *
144format_ethernet_arp_opcode (u8 * s, va_list * va)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700145{
146 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700147 char *t = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700148 switch (o)
149 {
150#define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
151 foreach_ethernet_arp_opcode;
152#undef _
153
154 default:
155 return format (s, "unknown 0x%x", o);
156 }
157
158 return format (s, "%s", t);
159}
160
161static uword
162unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
163 va_list * args)
164{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700165 int *result = va_arg (*args, int *);
166 ethernet_arp_main_t *am = &ethernet_arp_main;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700167 int x, i;
168
169 /* Numeric opcode. */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700170 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
Ed Warnickecb9cada2015-12-08 15:45:58 -0700171 {
172 if (x >= (1 << 16))
173 return 0;
174 *result = x;
175 return 1;
176 }
177
178 /* Named type. */
179 if (unformat_user (input, unformat_vlib_number_by_name,
180 am->opcode_by_name, &i))
181 {
182 *result = i;
183 return 1;
184 }
185
186 return 0;
187}
188
189static uword
190unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
191 va_list * args)
192{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700193 int *result = va_arg (*args, int *);
194 if (!unformat_user
195 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
Ed Warnickecb9cada2015-12-08 15:45:58 -0700196 return 0;
197
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700198 *result = clib_host_to_net_u16 ((u16) * result);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700199 return 1;
200}
201
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700202static u8 *
203format_ethernet_arp_header (u8 * s, va_list * va)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700204{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700205 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700206 u32 max_header_bytes = va_arg (*va, u32);
Christophe Fontained3c008d2017-10-02 18:10:54 +0200207 u32 indent;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700208 u16 l2_type, l3_type;
209
210 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
211 return format (s, "ARP header truncated");
212
213 l2_type = clib_net_to_host_u16 (a->l2_type);
214 l3_type = clib_net_to_host_u16 (a->l3_type);
215
216 indent = format_get_indent (s);
217
218 s = format (s, "%U, type %U/%U, address size %d/%d",
219 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
220 format_ethernet_arp_hardware_type, l2_type,
221 format_ethernet_type, l3_type,
222 a->n_l2_address_bytes, a->n_l3_address_bytes);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700223
Ed Warnickecb9cada2015-12-08 15:45:58 -0700224 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
225 && l3_type == ETHERNET_TYPE_IP4)
226 {
227 s = format (s, "\n%U%U/%U -> %U/%U",
228 format_white_space, indent,
229 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
230 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
231 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
232 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
233 }
234 else
235 {
236 uword n2 = a->n_l2_address_bytes;
237 uword n3 = a->n_l3_address_bytes;
238 s = format (s, "\n%U%U/%U -> %U/%U",
239 format_white_space, indent,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700240 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
241 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
242 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
243 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700244 }
245
246 return s;
247}
248
Pavel Kotucek3e046ea2016-12-05 08:27:37 +0100249u8 *
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700250format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700251{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700252 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
253 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
254 vnet_sw_interface_t *si;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700255 u8 *flags = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700256
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700257 if (!e)
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100258 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700259 "Flags", "Ethernet", "Interface");
Ed Warnickecb9cada2015-12-08 15:45:58 -0700260
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100261 si = vnet_get_sw_interface (vnm, e->sw_if_index);
Damjan Marion102ec522016-03-29 13:18:17 +0200262
263 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700264 flags = format (flags, "S");
Damjan Marion102ec522016-03-29 13:18:17 +0200265
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100266 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
267 flags = format (flags, "D");
268
Neale Rannsb3b2de72017-03-08 05:17:22 -0800269 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
270 flags = format (flags, "N");
271
Neale Ranns5c994c12017-08-04 06:22:23 -0700272 s = format (s, "%=12U%=16U%=6s%=20U%U",
John Lo7f358b32018-04-28 01:19:24 -0400273 format_vlib_time, vnm->vlib_main, e->time_last_updated,
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100274 format_ip4_address, &e->ip4_address,
Damjan Marion102ec522016-03-29 13:18:17 +0200275 flags ? (char *) flags : "",
Ed Warnickecb9cada2015-12-08 15:45:58 -0700276 format_ethernet_address, e->ethernet_address,
277 format_vnet_sw_interface_name, vnm, si);
278
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700279 vec_free (flags);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700280 return s;
281}
282
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700283typedef struct
284{
Ed Warnickecb9cada2015-12-08 15:45:58 -0700285 u8 packet_data[64];
286} ethernet_arp_input_trace_t;
287
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700288static u8 *
289format_ethernet_arp_input_trace (u8 * s, va_list * va)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700290{
291 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
292 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700293 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700294
295 s = format (s, "%U",
296 format_ethernet_arp_header,
297 t->packet_data, sizeof (t->packet_data));
298
299 return s;
300}
301
John Lo1edfba92016-08-27 01:11:57 -0400302static u8 *
303format_arp_term_input_trace (u8 * s, va_list * va)
304{
305 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
306 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
307 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
308
309 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
310 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
311 - for ip6, the first nibble has value of 6. */
312 s = format (s, "%U", t->packet_data[0] == 0 ?
313 format_ethernet_arp_header : format_ip6_header,
314 t->packet_data, sizeof (t->packet_data));
315
316 return s;
317}
318
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100319static void
Neale Rannsb80c5362016-10-08 13:03:40 +0100320arp_nbr_probe (ip_adjacency_t * adj)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700321{
Neale Rannsb80c5362016-10-08 13:03:40 +0100322 vnet_main_t *vnm = vnet_get_main ();
323 ip4_main_t *im = &ip4_main;
324 ip_interface_address_t *ia;
325 ethernet_arp_header_t *h;
326 vnet_hw_interface_t *hi;
327 vnet_sw_interface_t *si;
328 ip4_address_t *src;
329 vlib_buffer_t *b;
330 vlib_main_t *vm;
331 u32 bi = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700332
Neale Rannsb80c5362016-10-08 13:03:40 +0100333 vm = vlib_get_main ();
John Locbec1a12016-07-05 18:34:40 -0400334
Neale Rannsb80c5362016-10-08 13:03:40 +0100335 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
336
337 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
Ed Warnickecb9cada2015-12-08 15:45:58 -0700338 {
Neale Rannsb80c5362016-10-08 13:03:40 +0100339 return;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700340 }
Neale Rannsb80c5362016-10-08 13:03:40 +0100341
342 src =
343 ip4_interface_address_matching_destination (im,
344 &adj->sub_type.nbr.next_hop.
345 ip4,
346 adj->rewrite_header.
347 sw_if_index, &ia);
348 if (!src)
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100349 {
Neale Rannsb80c5362016-10-08 13:03:40 +0100350 return;
351 }
352
353 h =
354 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
355 &bi);
John Lo084606b2018-06-19 15:27:48 -0400356 if (!h)
357 return;
Neale Rannsb80c5362016-10-08 13:03:40 +0100358
359 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
360
Dave Barach178cf492018-11-13 16:34:13 -0500361 clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet,
362 hi->hw_address,
363 sizeof (h->ip4_over_ethernet[0].ethernet));
Neale Rannsb80c5362016-10-08 13:03:40 +0100364
365 h->ip4_over_ethernet[0].ip4 = src[0];
366 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
367
368 b = vlib_get_buffer (vm, bi);
369 vnet_buffer (b)->sw_if_index[VLIB_RX] =
370 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
371
372 /* Add encapsulation string for software interface (e.g. ethernet header). */
373 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
374 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
375
376 {
377 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
378 u32 *to_next = vlib_frame_vector_args (f);
379 to_next[0] = bi;
380 f->n_vectors = 1;
381 vlib_put_frame_to_node (vm, hi->output_node_index, f);
382 }
383}
384
385static void
386arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
387{
388 adj_nbr_update_rewrite
389 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
390 ethernet_build_rewrite (vnet_get_main (),
391 e->sw_if_index,
392 adj_get_link_type (ai), e->ethernet_address));
393}
394
395static void
Neale Ranns19c68d22016-12-07 15:38:14 +0000396arp_mk_incomplete (adj_index_t ai)
Neale Rannsb80c5362016-10-08 13:03:40 +0100397{
Neale Ranns19c68d22016-12-07 15:38:14 +0000398 ip_adjacency_t *adj = adj_get (ai);
399
Neale Rannsb80c5362016-10-08 13:03:40 +0100400 adj_nbr_update_rewrite
401 (ai,
402 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
403 ethernet_build_rewrite (vnet_get_main (),
Neale Ranns19c68d22016-12-07 15:38:14 +0000404 adj->rewrite_header.sw_if_index,
Neale Rannsb80c5362016-10-08 13:03:40 +0100405 VNET_LINK_ARP,
406 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
407}
408
409static ethernet_arp_ip4_entry_t *
410arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
411{
412 ethernet_arp_main_t *am = &ethernet_arp_main;
413 ethernet_arp_ip4_entry_t *e = NULL;
414 uword *p;
415
416 if (NULL != eai->arp_entries)
417 {
418 p = hash_get (eai->arp_entries, addr->as_u32);
419 if (!p)
420 return (NULL);
421
422 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
423 }
424
425 return (e);
426}
427
428static adj_walk_rc_t
429arp_mk_complete_walk (adj_index_t ai, void *ctx)
430{
431 ethernet_arp_ip4_entry_t *e = ctx;
432
433 arp_mk_complete (ai, e);
434
435 return (ADJ_WALK_RC_CONTINUE);
436}
437
438static adj_walk_rc_t
439arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
440{
Neale Ranns19c68d22016-12-07 15:38:14 +0000441 arp_mk_incomplete (ai);
Neale Rannsb80c5362016-10-08 13:03:40 +0100442
443 return (ADJ_WALK_RC_CONTINUE);
444}
445
446void
447arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
448{
449 ethernet_arp_main_t *am = &ethernet_arp_main;
450 ethernet_arp_interface_t *arp_int;
451 ethernet_arp_ip4_entry_t *e;
452 ip_adjacency_t *adj;
453
454 adj = adj_get (ai);
455
456 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
457 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
458 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
459
Neale Ranns32e1c012016-11-22 17:07:28 +0000460 switch (adj->lookup_next_index)
Neale Rannsb80c5362016-10-08 13:03:40 +0100461 {
Ole Trøan438f6302018-02-15 21:56:06 +0000462 case IP_LOOKUP_NEXT_GLEAN:
Neale Rannsc819fc62018-02-16 02:44:05 -0800463 adj_glean_update_rewrite (ai);
464 break;
465 case IP_LOOKUP_NEXT_ARP:
Neale Ranns32e1c012016-11-22 17:07:28 +0000466 if (NULL != e)
467 {
468 adj_nbr_walk_nh4 (sw_if_index,
469 &e->ip4_address, arp_mk_complete_walk, e);
470 }
471 else
472 {
473 /*
474 * no matching ARP entry.
475 * construct the rewrite required to for an ARP packet, and stick
476 * that in the adj's pipe to smoke.
477 */
478 adj_nbr_update_rewrite
479 (ai,
480 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
481 ethernet_build_rewrite
482 (vnm,
483 sw_if_index,
484 VNET_LINK_ARP,
485 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
486
487 /*
488 * since the FIB has added this adj for a route, it makes sense it
489 * may want to forward traffic sometime soon. Let's send a
490 * speculative ARP. just one. If we were to do periodically that
491 * wouldn't be bad either, but that's more code than i'm prepared to
492 * write at this time for relatively little reward.
493 */
494 arp_nbr_probe (adj);
495 }
496 break;
Neale Ranns1855b8e2018-07-11 10:31:26 -0700497 case IP_LOOKUP_NEXT_BCAST:
498 adj_nbr_update_rewrite (ai,
499 ADJ_NBR_REWRITE_FLAG_COMPLETE,
500 ethernet_build_rewrite
501 (vnm,
502 sw_if_index,
503 VNET_LINK_IP4,
504 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
505 break;
Neale Ranns32e1c012016-11-22 17:07:28 +0000506 case IP_LOOKUP_NEXT_MCAST:
Neale Ranns2e7fbcc2017-03-15 04:22:25 -0700507 {
508 /*
509 * Construct a partial rewrite from the known ethernet mcast dest MAC
510 */
511 u8 *rewrite;
512 u8 offset;
Neale Rannsb80c5362016-10-08 13:03:40 +0100513
Neale Ranns2e7fbcc2017-03-15 04:22:25 -0700514 rewrite = ethernet_build_rewrite (vnm,
515 sw_if_index,
516 adj->ia_link,
517 ethernet_ip4_mcast_dst_addr ());
518 offset = vec_len (rewrite) - 2;
Neale Ranns32e1c012016-11-22 17:07:28 +0000519
Neale Ranns2e7fbcc2017-03-15 04:22:25 -0700520 /*
521 * Complete the remaining fields of the adj's rewrite to direct the
522 * complete of the rewrite at switch time by copying in the IP
523 * dst address's bytes.
Neale Ranns889fe942017-06-01 05:43:19 -0400524 * Ofset is 2 bytes into the MAC desintation address.
Neale Ranns2e7fbcc2017-03-15 04:22:25 -0700525 */
Neale Ranns889fe942017-06-01 05:43:19 -0400526 adj_mcast_update_rewrite (ai, rewrite, offset);
Neale Ranns32e1c012016-11-22 17:07:28 +0000527
Neale Ranns2e7fbcc2017-03-15 04:22:25 -0700528 break;
529 }
Neale Ranns32e1c012016-11-22 17:07:28 +0000530 case IP_LOOKUP_NEXT_DROP:
531 case IP_LOOKUP_NEXT_PUNT:
532 case IP_LOOKUP_NEXT_LOCAL:
533 case IP_LOOKUP_NEXT_REWRITE:
Neale Ranns0f26c5a2017-03-01 15:12:11 -0800534 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
Neale Ranns32e1c012016-11-22 17:07:28 +0000535 case IP_LOOKUP_NEXT_MIDCHAIN:
536 case IP_LOOKUP_NEXT_ICMP_ERROR:
537 case IP_LOOKUP_N_NEXT:
538 ASSERT (0);
539 break;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100540 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700541}
542
Neale Ranns15002542017-09-10 04:39:11 -0700543static void
Neale Ranns6b3a8ef2017-09-11 10:34:33 -0700544arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
Neale Ranns15002542017-09-10 04:39:11 -0700545{
546 fib_prefix_t pfx = {
547 .fp_len = 32,
548 .fp_proto = FIB_PROTOCOL_IP4,
549 .fp_addr.ip4 = e->ip4_address,
550 };
551
552 e->fib_entry_index =
553 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
554 FIB_ENTRY_FLAG_ATTACHED,
555 DPO_PROTO_IP4, &pfx.fp_addr,
556 e->sw_if_index, ~0, 1, NULL,
557 FIB_ROUTE_PATH_FLAG_NONE);
558 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
559}
560
Neale Rannscf7efe02018-09-24 08:34:11 +0000561static void
John Lo4fed5b12018-05-22 03:35:06 -0400562arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
563{
564 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
565 {
566 fib_prefix_t pfx = {
567 .fp_len = 32,
568 .fp_proto = FIB_PROTOCOL_IP4,
569 .fp_addr.ip4 = e->ip4_address,
570 };
571 u32 fib_index;
572
573 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
574
575 fib_table_entry_path_remove (fib_index, &pfx,
576 FIB_SOURCE_ADJ,
577 DPO_PROTO_IP4,
578 &pfx.fp_addr,
579 e->sw_if_index, ~0, 1,
580 FIB_ROUTE_PATH_FLAG_NONE);
581 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
582 }
583}
584
585static ethernet_arp_ip4_entry_t *
586force_reuse_arp_entry (void)
587{
588 ethernet_arp_ip4_entry_t *e;
589 ethernet_arp_main_t *am = &ethernet_arp_main;
590 u32 count = 0;
591 u32 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
592 if (index == ~0) /* Try again from elt 0 */
593 index = pool_next_index (am->ip4_entry_pool, index);
594
595 /* Find a non-static random entry to free up for reuse */
596 do
597 {
598 if ((count++ == 100) || (index == ~0))
599 return NULL; /* give up after 100 entries */
600 e = pool_elt_at_index (am->ip4_entry_pool, index);
601 am->arp_delete_rotor = index;
602 index = pool_next_index (am->ip4_entry_pool, index);
603 }
604 while (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC);
605
606 /* Remove ARP entry from its interface and update fib */
607 hash_unset
608 (am->ethernet_arp_by_sw_if_index[e->sw_if_index].arp_entries,
609 e->ip4_address.as_u32);
610 arp_adj_fib_remove
611 (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
612 adj_nbr_walk_nh4 (e->sw_if_index,
Neale Rannscf7efe02018-09-24 08:34:11 +0000613 &e->ip4_address, arp_mk_incomplete_walk, e);
John Lo4fed5b12018-05-22 03:35:06 -0400614 return e;
615}
616
Eyal Bari20197482017-09-13 12:29:08 +0300617static int
Ed Warnickecb9cada2015-12-08 15:45:58 -0700618vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100619 vnet_arp_set_ip4_over_ethernet_rpc_args_t
620 * args)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700621{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700622 ethernet_arp_ip4_entry_t *e = 0;
623 ethernet_arp_main_t *am = &ethernet_arp_main;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100624 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700625 vlib_main_t *vm = vlib_get_main ();
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700626 int make_new_arp_cache_entry = 1;
627 uword *p;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700628 pending_resolution_t *pr, *mc;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100629 ethernet_arp_interface_t *arp_int;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100630 int is_static = args->is_static;
631 u32 sw_if_index = args->sw_if_index;
Neale Rannsb3b2de72017-03-08 05:17:22 -0800632 int is_no_fib_entry = args->is_no_fib_entry;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700633
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100634 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700635
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100636 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
Ed Warnickecb9cada2015-12-08 15:45:58 -0700637
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100638 if (NULL != arp_int->arp_entries)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700639 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100640 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
641 if (p)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700642 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100643 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
644
645 /* Refuse to over-write static arp. */
646 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
John Lo0e6f4d62018-07-13 17:29:58 -0400647 {
648 /* if MAC address match, still check to send event */
649 if (0 == memcmp (e->ethernet_address,
650 a->ethernet, sizeof (e->ethernet_address)))
651 goto check_customers;
652 return -2;
653 }
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100654 make_new_arp_cache_entry = 0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700655 }
Damjan Marion102ec522016-03-29 13:18:17 +0200656 }
657
Ed Warnickecb9cada2015-12-08 15:45:58 -0700658 if (make_new_arp_cache_entry)
659 {
John Lo4fed5b12018-05-22 03:35:06 -0400660 if (am->limit_arp_cache_size &&
661 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
662 {
663 e = force_reuse_arp_entry ();
664 if (NULL == e)
665 return -2;
666 }
667 else
668 pool_get (am->ip4_entry_pool, e);
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100669
670 if (NULL == arp_int->arp_entries)
John Lo4fed5b12018-05-22 03:35:06 -0400671 arp_int->arp_entries = hash_create (0, sizeof (u32));
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100672
673 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
674
675 e->sw_if_index = sw_if_index;
676 e->ip4_address = a->ip4;
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700677 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
Dave Barach178cf492018-11-13 16:34:13 -0500678 clib_memcpy_fast (e->ethernet_address,
679 a->ethernet, sizeof (e->ethernet_address));
Neale Rannsb80c5362016-10-08 13:03:40 +0100680
Neale Rannsb3b2de72017-03-08 05:17:22 -0800681 if (!is_no_fib_entry)
682 {
Neale Ranns15002542017-09-10 04:39:11 -0700683 arp_adj_fib_add (e,
684 ip4_fib_table_get_index_for_sw_if_index
685 (e->sw_if_index));
Neale Ranns2a3ea492017-04-19 05:24:40 -0700686 }
687 else
688 {
Neale Rannsb3b2de72017-03-08 05:17:22 -0800689 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
690 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700691 }
Neale Ranns33a7dd52016-10-07 15:14:33 +0100692 else
693 {
694 /*
695 * prevent a DoS attack from the data-plane that
696 * spams us with no-op updates to the MAC address
697 */
698 if (0 == memcmp (e->ethernet_address,
699 a->ethernet, sizeof (e->ethernet_address)))
John Lo7f358b32018-04-28 01:19:24 -0400700 {
701 e->time_last_updated = vlib_time_now (vm);
702 goto check_customers;
703 }
Neale Rannsb80c5362016-10-08 13:03:40 +0100704
John Lo0e6f4d62018-07-13 17:29:58 -0400705 /* Update ethernet address. */
Dave Barach178cf492018-11-13 16:34:13 -0500706 clib_memcpy_fast (e->ethernet_address, a->ethernet,
707 sizeof (e->ethernet_address));
Neale Ranns33a7dd52016-10-07 15:14:33 +0100708 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700709
John Lo0e6f4d62018-07-13 17:29:58 -0400710 /* Update time stamp and flags. */
John Lo7f358b32018-04-28 01:19:24 -0400711 e->time_last_updated = vlib_time_now (vm);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700712 if (is_static)
Jon Loeliger1f6e9282018-05-17 15:55:00 -0500713 {
714 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
715 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
716 }
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100717 else
Jon Loeliger1f6e9282018-05-17 15:55:00 -0500718 {
719 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
720 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
721 }
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100722
Neale Rannsb80c5362016-10-08 13:03:40 +0100723 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700724
Dave Barach59b25652017-09-10 15:04:27 -0400725check_customers:
Ed Warnickecb9cada2015-12-08 15:45:58 -0700726 /* Customer(s) waiting for this address to be resolved? */
727 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
728 if (p)
729 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100730 u32 next_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700731 next_index = p[0];
732
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700733 while (next_index != (u32) ~ 0)
734 {
735 pr = pool_elt_at_index (am->pending_resolutions, next_index);
736 vlib_process_signal_event (vm, pr->node_index,
737 pr->type_opaque, pr->data);
738 next_index = pr->next_index;
739 pool_put (am->pending_resolutions, pr);
740 }
741
Ed Warnickecb9cada2015-12-08 15:45:58 -0700742 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
743 }
744
745 /* Customer(s) requesting ARP event for this address? */
746 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
747 if (p)
748 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100749 u32 next_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700750 next_index = p[0];
751
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700752 while (next_index != (u32) ~ 0)
753 {
754 int (*fp) (u32, u8 *, u32, u32);
755 int rv = 1;
756 mc = pool_elt_at_index (am->mac_changes, next_index);
757 fp = mc->data_callback;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700758
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700759 /* Call the user's data callback, return 1 to suppress dup events */
760 if (fp)
761 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
762
Damjan Marion607de1a2016-08-16 22:53:54 +0200763 /*
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700764 * Signal the resolver process, as long as the user
765 * says they want to be notified
766 */
767 if (rv == 0)
768 vlib_process_signal_event (vm, mc->node_index,
769 mc->type_opaque, mc->data);
770 next_index = mc->next_index;
771 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700772 }
773
774 return 0;
775}
776
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700777void
778vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
779 void *address_arg,
780 uword node_index,
781 uword type_opaque, uword data)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700782{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700783 ethernet_arp_main_t *am = &ethernet_arp_main;
784 ip4_address_t *address = address_arg;
785 uword *p;
786 pending_resolution_t *pr;
787
Ed Warnickecb9cada2015-12-08 15:45:58 -0700788 pool_get (am->pending_resolutions, pr);
789
790 pr->next_index = ~0;
791 pr->node_index = node_index;
792 pr->type_opaque = type_opaque;
793 pr->data = data;
794 pr->data_callback = 0;
795
796 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
797 if (p)
798 {
799 /* Insert new resolution at the head of the list */
800 pr->next_index = p[0];
801 hash_unset (am->pending_resolutions_by_address, address->as_u32);
802 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700803
804 hash_set (am->pending_resolutions_by_address, address->as_u32,
805 pr - am->pending_resolutions);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700806}
807
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700808int
809vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
810 void *data_callback,
811 u32 pid,
812 void *address_arg,
813 uword node_index,
814 uword type_opaque, uword data, int is_add)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700815{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700816 ethernet_arp_main_t *am = &ethernet_arp_main;
817 ip4_address_t *address = address_arg;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700818
Eyal Bari8db1de82017-03-31 02:15:17 +0300819 /* Try to find an existing entry */
820 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
821 u32 *p = first;
822 pending_resolution_t *mc;
823 while (p && *p != ~0)
824 {
825 mc = pool_elt_at_index (am->mac_changes, *p);
826 if (mc->node_index == node_index && mc->type_opaque == type_opaque
827 && mc->pid == pid)
828 break;
829 p = &mc->next_index;
830 }
831
832 int found = p && *p != ~0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700833 if (is_add)
834 {
Eyal Bari8db1de82017-03-31 02:15:17 +0300835 if (found)
836 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
837
Ed Warnickecb9cada2015-12-08 15:45:58 -0700838 pool_get (am->mac_changes, mc);
Eyal Bari8db1de82017-03-31 02:15:17 +0300839 *mc = (pending_resolution_t)
840 {
841 .next_index = ~0,.node_index = node_index,.type_opaque =
842 type_opaque,.data = data,.data_callback = data_callback,.pid =
843 pid,};
Ed Warnickecb9cada2015-12-08 15:45:58 -0700844
Eyal Bari8db1de82017-03-31 02:15:17 +0300845 /* Insert new resolution at the end of the list */
846 u32 new_idx = mc - am->mac_changes;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700847 if (p)
Eyal Bari8db1de82017-03-31 02:15:17 +0300848 p[0] = new_idx;
849 else
850 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700851 }
852 else
853 {
Eyal Bari8db1de82017-03-31 02:15:17 +0300854 if (!found)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700855 return VNET_API_ERROR_NO_SUCH_ENTRY;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700856
Eyal Bari8db1de82017-03-31 02:15:17 +0300857 /* Clients may need to clean up pool entries, too */
858 void (*fp) (u32, u8 *) = data_callback;
859 if (fp)
860 (*fp) (mc->data, 0 /* no new mac addrs */ );
Ed Warnickecb9cada2015-12-08 15:45:58 -0700861
Eyal Bari8db1de82017-03-31 02:15:17 +0300862 /* Remove the entry from the list and delete the entry */
863 *p = mc->next_index;
864 pool_put (am->mac_changes, mc);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700865
Eyal Bari8db1de82017-03-31 02:15:17 +0300866 /* Remove from hash if we deleted the last entry */
867 if (*p == ~0 && p == first)
868 hash_unset (am->mac_changes_by_address, address->as_u32);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700869 }
Eyal Bari8db1de82017-03-31 02:15:17 +0300870 return 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700871}
872
873/* Either we drop the packet or we send a reply to the sender. */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700874typedef enum
875{
Ed Warnickecb9cada2015-12-08 15:45:58 -0700876 ARP_INPUT_NEXT_DROP,
John Lod1f5d042016-04-12 18:20:39 -0400877 ARP_INPUT_NEXT_REPLY_TX,
Ed Warnickecb9cada2015-12-08 15:45:58 -0700878 ARP_INPUT_N_NEXT,
879} arp_input_next_t;
880
881#define foreach_ethernet_arp_error \
882 _ (replies_sent, "ARP replies sent") \
883 _ (l2_type_not_ethernet, "L2 type not ethernet") \
884 _ (l3_type_not_ip4, "L3 type not IP4") \
885 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
886 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
Neale Ranns59ae61e2018-06-07 18:09:49 -0700887 _ (l3_dst_address_unset, "IP4 destination address is unset") \
Ed Warnickecb9cada2015-12-08 15:45:58 -0700888 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
889 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
890 _ (replies_received, "ARP replies received") \
891 _ (opcode_not_request, "ARP opcode not request") \
892 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
893 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
Ed Warnickecb9cada2015-12-08 15:45:58 -0700894 _ (gratuitous_arp, "ARP probe or announcement dropped") \
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100895 _ (interface_no_table, "Interface is not mapped to an IP table") \
Neale Rannsd96bad82017-03-08 01:12:54 -0800896 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
Neale Ranns7425f922019-01-23 00:36:16 -0800897 _ (unnumbered_mismatch, "RX interface is unnumbered to different subnet") \
Ed Warnickecb9cada2015-12-08 15:45:58 -0700898
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700899typedef enum
900{
Ed Warnickecb9cada2015-12-08 15:45:58 -0700901#define _(sym,string) ETHERNET_ARP_ERROR_##sym,
902 foreach_ethernet_arp_error
903#undef _
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700904 ETHERNET_ARP_N_ERROR,
Ed Warnickecb9cada2015-12-08 15:45:58 -0700905} ethernet_arp_input_error_t;
906
Neale Ranns436d06b2016-11-30 07:41:53 -0800907static int
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700908arp_unnumbered (vlib_buffer_t * p0,
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700909 u32 input_sw_if_index, u32 conn_sw_if_index)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700910{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700911 vnet_main_t *vnm = vnet_get_main ();
912 vnet_interface_main_t *vim = &vnm->interface_main;
913 vnet_sw_interface_t *si;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700914
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700915 /* verify that the input interface is unnumbered to the connected.
916 * the connected interface is the interface on which the subnet is
917 * configured */
918 si = &vim->sw_interfaces[input_sw_if_index];
919
920 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
921 (si->unnumbered_sw_if_index == conn_sw_if_index)))
922 {
923 /* the input interface is not unnumbered to the interface on which
924 * the sub-net is configured that covers the ARP request.
925 * So this is not the case for unnumbered.. */
926 return 0;
927 }
928
Neale Ranns436d06b2016-11-30 07:41:53 -0800929 return !0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700930}
931
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700932static u32
933arp_learn (vnet_main_t * vnm,
Neale Rannscf7efe02018-09-24 08:34:11 +0000934 ethernet_arp_main_t * am, u32 sw_if_index,
935 const ethernet_arp_ip4_over_ethernet_address_t * addr)
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700936{
Neale Rannsd5b6aa12017-05-16 08:46:45 -0700937 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
938 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
939}
940
Ed Warnickecb9cada2015-12-08 15:45:58 -0700941static uword
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700942arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700943{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700944 ethernet_arp_main_t *am = &ethernet_arp_main;
945 vnet_main_t *vnm = vnet_get_main ();
946 ip4_main_t *im4 = &ip4_main;
947 u32 n_left_from, next_index, *from, *to_next;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700948 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
949
950 from = vlib_frame_vector_args (frame);
951 n_left_from = frame->n_vectors;
952 next_index = node->cached_next_index;
953
954 if (node->flags & VLIB_NODE_FLAG_TRACE)
955 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
956 /* stride */ 1,
957 sizeof (ethernet_arp_input_trace_t));
958
959 while (n_left_from > 0)
960 {
961 u32 n_left_to_next;
962
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700963 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700964
965 while (n_left_from > 0 && n_left_to_next > 0)
966 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700967 vlib_buffer_t *p0;
968 vnet_hw_interface_t *hw_if0;
969 ethernet_arp_header_t *arp0;
Neale Ranns30d0fd42017-05-30 07:30:04 -0700970 ethernet_header_t *eth_rx, *eth_tx;
Neale Rannsc5d43172018-07-30 08:04:40 -0700971 const ip4_address_t *if_addr0;
972 ip4_address_t proxy_src;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100973 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
Matthew Smithcb9ab472017-05-16 21:35:56 -0500974 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700975 ethernet_proxy_arp_t *pa;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100976 fib_node_index_t dst_fei, src_fei;
Neale Rannsc5d43172018-07-30 08:04:40 -0700977 const fib_prefix_t *pfx0;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100978 fib_entry_flag_t src_flags, dst_flags;
Neale Rannsa3a3a9d2017-08-08 12:35:11 -0700979 u8 *rewrite0, rewrite0_len;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700980
981 pi0 = from[0];
982 to_next[0] = pi0;
983 from += 1;
984 to_next += 1;
985 n_left_from -= 1;
986 n_left_to_next -= 1;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100987 pa = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700988
989 p0 = vlib_get_buffer (vm, pi0);
990 arp0 = vlib_buffer_get_current (p0);
Neale Ranns30d0fd42017-05-30 07:30:04 -0700991 /* Fill in ethernet header. */
992 eth_rx = ethernet_buffer_get_header (p0);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700993
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700994 is_request0 = arp0->opcode
995 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700996
997 error0 = ETHERNET_ARP_ERROR_replies_sent;
998
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -0700999 error0 =
1000 (arp0->l2_type !=
1001 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1002 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1003 error0 =
1004 (arp0->l3_type !=
1005 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1006 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
Neale Ranns59ae61e2018-06-07 18:09:49 -07001007 error0 =
1008 (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
1009 ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001010
1011 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1012
Neale Rannsd96bad82017-03-08 01:12:54 -08001013 /* not playing the ARP game if the interface is not IPv4 enabled */
1014 error0 =
1015 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1016 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1017
Ed Warnickecb9cada2015-12-08 15:45:58 -07001018 if (error0)
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001019 goto drop2;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001020
1021 /* Check that IP address is local and matches incoming interface. */
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001022 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1023 if (~0 == fib_index0)
1024 {
1025 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1026 goto drop2;
1027
1028 }
1029 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1030 &arp0->ip4_over_ethernet[1].ip4,
1031 32);
Matus Fabiandccbee32017-01-31 22:20:30 -08001032 dst_flags = fib_entry_get_flags (dst_fei);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001033
Matus Fabiandccbee32017-01-31 22:20:30 -08001034 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001035
Neale Rannsca193612017-06-14 06:50:08 -07001036 /* Honor unnumbered interface, if any */
1037 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1038
1039 {
1040 /*
1041 * we're looking for FIB entries that indicate the source
1042 * is attached. There may be more specific non-attached
Neale Ranns2303cb12018-02-21 04:57:17 -08001043 * routes that match the source, but these do not influence
Neale Rannsca193612017-06-14 06:50:08 -07001044 * whether we respond to an ARP request, i.e. they do not
1045 * influence whether we are the correct way for the sender
1046 * to reach us, they only affect how we reach the sender.
1047 */
1048 fib_entry_t *src_fib_entry;
Neale Rannsc5d43172018-07-30 08:04:40 -07001049 const fib_prefix_t *pfx;
Neale Rannsca193612017-06-14 06:50:08 -07001050 fib_entry_src_t *src;
1051 fib_source_t source;
Neale Rannsca193612017-06-14 06:50:08 -07001052 int attached;
1053 int mask;
1054
1055 mask = 32;
1056 attached = 0;
1057
1058 do
1059 {
1060 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1061 &arp0->
1062 ip4_over_ethernet[0].ip4,
1063 mask);
1064 src_fib_entry = fib_entry_get (src_fei);
1065
1066 /*
1067 * It's possible that the source that provides the
1068 * flags we need, or the flags we must not have,
1069 * is not the best source, so check then all.
1070 */
1071 /* *INDENT-OFF* */
1072 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1073 ({
1074 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1075
1076 /* Reject requests/replies with our local interface
1077 address. */
1078 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1079 {
1080 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
Neale Ranns24b170a2017-08-15 05:33:11 -07001081 /*
1082 * When VPP has an interface whose address is also
1083 * applied to a TAP interface on the host, then VPP's
1084 * TAP interface will be unnumbered to the 'real'
1085 * interface and do proxy ARP from the host.
1086 * The curious aspect of this setup is that ARP requests
1087 * from the host will come from the VPP's own address.
1088 * So don't drop immediately here, instead go see if this
1089 * is a proxy ARP case.
1090 */
1091 goto drop1;
Neale Rannsca193612017-06-14 06:50:08 -07001092 }
1093 /* A Source must also be local to subnet of matching
1094 * interface address. */
1095 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1096 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1097 {
1098 attached = 1;
1099 break;
1100 }
1101 /*
1102 * else
1103 * The packet was sent from an address that is not
1104 * connected nor attached i.e. it is not from an
1105 * address that is covered by a link's sub-net,
1106 * nor is it a already learned host resp.
1107 */
1108 }));
1109 /* *INDENT-ON* */
1110
1111 /*
1112 * shorter mask lookup for the next iteration.
1113 */
Neale Rannsc5d43172018-07-30 08:04:40 -07001114 pfx = fib_entry_get_prefix (src_fei);
1115 mask = pfx->fp_len - 1;
Neale Rannsca193612017-06-14 06:50:08 -07001116
1117 /*
1118 * continue until we hit the default route or we find
1119 * the attached we are looking for. The most likely
1120 * outcome is we find the attached with the first source
1121 * on the first lookup.
1122 */
1123 }
1124 while (!attached &&
1125 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1126
1127 if (!attached)
1128 {
1129 /*
1130 * the matching route is a not attached, i.e. it was
1131 * added as a result of routing, rather than interface/ARP
1132 * configuration. If the matching route is not a host route
1133 * (i.e. a /32)
1134 */
1135 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1136 goto drop2;
1137 }
1138 }
1139
Neale Ranns59ae61e2018-06-07 18:09:49 -07001140 if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ))
1141 {
1142 /*
1143 * We matched an adj-fib on ths source subnet (a /32 previously
1144 * added as a result of ARP). If this request is a gratuitous
1145 * ARP, then learn from it.
1146 * The check for matching an adj-fib, is to prevent hosts
1147 * from spamming us with gratuitous ARPS that might otherwise
1148 * blow our ARP cache
1149 */
1150 if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1151 arp0->ip4_over_ethernet[1].ip4.as_u32)
1152 error0 = arp_learn (vnm, am, sw_if_index0,
1153 &arp0->ip4_over_ethernet[0]);
1154 goto drop2;
1155 }
1156 else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
Ed Warnickecb9cada2015-12-08 15:45:58 -07001157 {
1158 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1159 goto drop1;
1160 }
1161
Neale Ranns797235a2017-01-09 14:33:38 +01001162 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1163 {
1164 /*
1165 * The interface the ARP was received on is not the interface
Neale Rannsca193612017-06-14 06:50:08 -07001166 * on which the covering prefix is configured. Maybe this is a
1167 * case for unnumbered.
Neale Ranns797235a2017-01-09 14:33:38 +01001168 */
1169 is_unnum0 = 1;
1170 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001171
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001172 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
Neale Rannsc5d43172018-07-30 08:04:40 -07001173 pfx0 = fib_entry_get_prefix (dst_fei);
1174 if_addr0 = &pfx0->fp_addr.ip4;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001175
Matthew Smithcb9ab472017-05-16 21:35:56 -05001176 is_vrrp_reply0 =
1177 ((arp0->opcode ==
1178 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1179 &&
1180 (!memcmp
1181 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1182 sizeof (vrrp_prefix))));
1183
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001184 /* Trash ARP packets whose ARP-level source addresses do not
Matthew Smithcb9ab472017-05-16 21:35:56 -05001185 match their L2-frame-level source addresses, unless it's
1186 a reply from a VRRP virtual router */
Neale Ranns30d0fd42017-05-30 07:30:04 -07001187 if (memcmp
1188 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1189 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001190 {
1191 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1192 goto drop2;
1193 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001194
Neale Rannsd5b6aa12017-05-16 08:46:45 -07001195 /* Learn or update sender's mapping only for replies to addresses
1196 * that are local to the subnet */
1197 if (arp0->opcode ==
Neale Ranns59ae61e2018-06-07 18:09:49 -07001198 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001199 {
Neale Ranns59ae61e2018-06-07 18:09:49 -07001200 if (dst_is_local0)
1201 error0 = arp_learn (vnm, am, sw_if_index0,
1202 &arp0->ip4_over_ethernet[0]);
1203 else
1204 /* a reply for a non-local destination could be a GARP.
1205 * GARPs for hosts we know were handled above, so this one
1206 * we drop */
1207 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1208
Ed Warnickecb9cada2015-12-08 15:45:58 -07001209 goto drop1;
1210 }
zhaoqinglingb4c42cd2017-12-23 15:20:59 +08001211 else if (arp0->opcode ==
1212 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1213 (dst_is_local0 == 0))
1214 {
1215 goto drop1;
1216 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001217
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001218 send_reply:
Neale Rannsa3a3a9d2017-08-08 12:35:11 -07001219 /* Send a reply.
1220 An adjacency to the sender is not always present,
1221 so we use the interface to build us a rewrite string
1222 which will contain all the necessary tags. */
1223 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1224 VNET_LINK_ARP,
1225 eth_rx->src_address);
1226 rewrite0_len = vec_len (rewrite0);
1227
Neale Ranns30d0fd42017-05-30 07:30:04 -07001228 /* Figure out how much to rewind current data from adjacency. */
Neale Rannsa3a3a9d2017-08-08 12:35:11 -07001229 vlib_buffer_advance (p0, -rewrite0_len);
Neale Ranns30d0fd42017-05-30 07:30:04 -07001230 eth_tx = vlib_buffer_get_current (p0);
1231
Ed Warnickecb9cada2015-12-08 15:45:58 -07001232 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1233 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1234
John Lod1f5d042016-04-12 18:20:39 -04001235 /* Send reply back through input interface */
1236 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1237 next0 = ARP_INPUT_NEXT_REPLY_TX;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001238
1239 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1240
1241 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1242
Dave Barach178cf492018-11-13 16:34:13 -05001243 clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet,
1244 hw_if0->hw_address, 6);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001245 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1246 if_addr0->data_u32;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001247
1248 /* Hardware must be ethernet-like. */
1249 ASSERT (vec_len (hw_if0->hw_address) == 6);
1250
Neale Ranns30d0fd42017-05-30 07:30:04 -07001251 /* the rx nd tx ethernet headers wil overlap in the case
1252 * when we received a tagged VLAN=0 packet, but we are sending
1253 * back untagged */
Dave Barach178cf492018-11-13 16:34:13 -05001254 clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
Neale Rannsa3a3a9d2017-08-08 12:35:11 -07001255 vec_free (rewrite0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001256
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001257 if (NULL == pa)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001258 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001259 if (is_unnum0)
Neale Ranns436d06b2016-11-30 07:41:53 -08001260 {
Neale Ranns30d0fd42017-05-30 07:30:04 -07001261 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
Neale Ranns7425f922019-01-23 00:36:16 -08001262 {
1263 error0 = ETHERNET_ARP_ERROR_unnumbered_mismatch;
1264 goto drop2;
1265 }
Neale Ranns436d06b2016-11-30 07:41:53 -08001266 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001267 }
Neale Ranns4b919a52017-03-11 05:55:21 -08001268
Neale Ranns24b170a2017-08-15 05:33:11 -07001269 /* We are going to reply to this request, so, in the absence of
1270 errors, learn the sender */
1271 if (!error0)
1272 error0 = arp_learn (vnm, am, sw_if_index0,
1273 &arp0->ip4_over_ethernet[1]);
Neale Rannsd5b6aa12017-05-16 08:46:45 -07001274
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001275 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1276 n_left_to_next, pi0, next0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001277
1278 n_replies_sent += 1;
1279 continue;
1280
1281 drop1:
Neale Ranns59ae61e2018-06-07 18:09:49 -07001282 if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1283 arp0->ip4_over_ethernet[1].ip4.as_u32)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001284 {
1285 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1286 goto drop2;
1287 }
1288 /* See if proxy arp is configured for the address */
1289 if (is_request0)
1290 {
1291 vnet_sw_interface_t *si;
1292 u32 this_addr = clib_net_to_host_u32
1293 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1294 u32 fib_index0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001295
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001296 si = vnet_get_sw_interface (vnm, sw_if_index0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001297
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001298 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1299 goto drop2;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001300
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001301 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1302 sw_if_index0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001303
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001304 vec_foreach (pa, am->proxy_arps)
1305 {
Neale Ranns0053de62018-05-22 08:40:52 -07001306 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1307 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001308
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001309 /* an ARP request hit in the proxy-arp table? */
1310 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1311 (fib_index0 == pa->fib_index))
1312 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001313 proxy_src.as_u32 =
1314 arp0->ip4_over_ethernet[1].ip4.data_u32;
1315
Damjan Marion607de1a2016-08-16 22:53:54 +02001316 /*
Neale Ranns30d0fd42017-05-30 07:30:04 -07001317 * change the interface address to the proxied
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001318 */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001319 if_addr0 = &proxy_src;
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001320 is_unnum0 = 0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001321 n_proxy_arp_replies_sent++;
1322 goto send_reply;
1323 }
1324 }
1325 }
1326
1327 drop2:
Ed Warnickecb9cada2015-12-08 15:45:58 -07001328
1329 next0 = ARP_INPUT_NEXT_DROP;
1330 p0->error = node->errors[error0];
1331
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001332 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1333 n_left_to_next, pi0, next0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001334 }
1335
1336 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1337 }
1338
1339 vlib_error_count (vm, node->node_index,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001340 ETHERNET_ARP_ERROR_replies_sent,
1341 n_replies_sent - n_proxy_arp_replies_sent);
1342
Ed Warnickecb9cada2015-12-08 15:45:58 -07001343 vlib_error_count (vm, node->node_index,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001344 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1345 n_proxy_arp_replies_sent);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001346 return frame->n_vectors;
1347}
1348
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001349static char *ethernet_arp_error_strings[] = {
Ed Warnickecb9cada2015-12-08 15:45:58 -07001350#define _(sym,string) string,
1351 foreach_ethernet_arp_error
1352#undef _
1353};
1354
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001355/* *INDENT-OFF* */
1356VLIB_REGISTER_NODE (arp_input_node, static) =
1357{
Ed Warnickecb9cada2015-12-08 15:45:58 -07001358 .function = arp_input,
1359 .name = "arp-input",
1360 .vector_size = sizeof (u32),
Ed Warnickecb9cada2015-12-08 15:45:58 -07001361 .n_errors = ETHERNET_ARP_N_ERROR,
1362 .error_strings = ethernet_arp_error_strings,
Ed Warnickecb9cada2015-12-08 15:45:58 -07001363 .n_next_nodes = ARP_INPUT_N_NEXT,
1364 .next_nodes = {
1365 [ARP_INPUT_NEXT_DROP] = "error-drop",
John Lod1f5d042016-04-12 18:20:39 -04001366 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
Ed Warnickecb9cada2015-12-08 15:45:58 -07001367 },
Ed Warnickecb9cada2015-12-08 15:45:58 -07001368 .format_buffer = format_ethernet_arp_header,
1369 .format_trace = format_ethernet_arp_input_trace,
1370};
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001371/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07001372
Ed Warnickecb9cada2015-12-08 15:45:58 -07001373static int
1374ip4_arp_entry_sort (void *a1, void *a2)
1375{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001376 ethernet_arp_ip4_entry_t *e1 = a1;
1377 ethernet_arp_ip4_entry_t *e2 = a2;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001378
1379 int cmp;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001380 vnet_main_t *vnm = vnet_get_main ();
Ed Warnickecb9cada2015-12-08 15:45:58 -07001381
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001382 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001383 if (!cmp)
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001384 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001385 return cmp;
1386}
1387
Pavel Kotucek3e046ea2016-12-05 08:27:37 +01001388ethernet_arp_ip4_entry_t *
John Lo7f358b32018-04-28 01:19:24 -04001389ip4_neighbors_pool (void)
1390{
1391 ethernet_arp_main_t *am = &ethernet_arp_main;
1392 return am->ip4_entry_pool;
1393}
1394
1395ethernet_arp_ip4_entry_t *
Pavel Kotucek3e046ea2016-12-05 08:27:37 +01001396ip4_neighbor_entries (u32 sw_if_index)
1397{
1398 ethernet_arp_main_t *am = &ethernet_arp_main;
1399 ethernet_arp_ip4_entry_t *n, *ns = 0;
1400
1401 /* *INDENT-OFF* */
1402 pool_foreach (n, am->ip4_entry_pool, ({
1403 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1404 continue;
1405 vec_add1 (ns, n[0]);
1406 }));
1407 /* *INDENT-ON* */
1408
1409 if (ns)
1410 vec_sort_with_function (ns, ip4_arp_entry_sort);
1411 return ns;
1412}
1413
Ed Warnickecb9cada2015-12-08 15:45:58 -07001414static clib_error_t *
1415show_ip4_arp (vlib_main_t * vm,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001416 unformat_input_t * input, vlib_cli_command_t * cmd)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001417{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001418 vnet_main_t *vnm = vnet_get_main ();
1419 ethernet_arp_main_t *am = &ethernet_arp_main;
1420 ethernet_arp_ip4_entry_t *e, *es;
1421 ethernet_proxy_arp_t *pa;
1422 clib_error_t *error = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001423 u32 sw_if_index;
1424
1425 /* Filter entries by interface if given. */
1426 sw_if_index = ~0;
1427 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1428
Pavel Kotucek3e046ea2016-12-05 08:27:37 +01001429 es = ip4_neighbor_entries (sw_if_index);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001430 if (es)
Keith Wilescb466842016-02-11 19:21:10 -06001431 {
Keith Wilescb466842016-02-11 19:21:10 -06001432 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001433 vec_foreach (e, es)
1434 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001435 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
Keith Wilescb466842016-02-11 19:21:10 -06001436 }
1437 vec_free (es);
1438 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001439
1440 if (vec_len (am->proxy_arps))
1441 {
1442 vlib_cli_output (vm, "Proxy arps enabled for:");
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001443 vec_foreach (pa, am->proxy_arps)
1444 {
1445 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1446 pa->fib_index,
1447 format_ip4_address, &pa->lo_addr,
1448 format_ip4_address, &pa->hi_addr);
1449 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001450 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001451
Ed Warnickecb9cada2015-12-08 15:45:58 -07001452 return error;
1453}
1454
Billy McFall2d085d92016-09-13 21:47:55 -04001455/*?
1456 * Display all the IPv4 ARP entries.
1457 *
1458 * @cliexpar
1459 * Example of how to display the IPv4 ARP table:
1460 * @cliexstart{show ip arp}
1461 * Time FIB IP4 Flags Ethernet Interface
1462 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1463 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1464 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1465 * Proxy arps enabled for:
1466 * Fib_index 0 6.0.0.1 - 6.0.0.11
1467 * @cliexend
1468 ?*/
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001469/* *INDENT-OFF* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07001470VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1471 .path = "show ip arp",
1472 .function = show_ip4_arp,
Billy McFall2d085d92016-09-13 21:47:55 -04001473 .short_help = "show ip arp",
Ed Warnickecb9cada2015-12-08 15:45:58 -07001474};
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001475/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07001476
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001477typedef struct
1478{
Ed Warnickecb9cada2015-12-08 15:45:58 -07001479 pg_edit_t l2_type, l3_type;
1480 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1481 pg_edit_t opcode;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001482 struct
1483 {
Ed Warnickecb9cada2015-12-08 15:45:58 -07001484 pg_edit_t ethernet;
1485 pg_edit_t ip4;
1486 } ip4_over_ethernet[2];
1487} pg_ethernet_arp_header_t;
1488
1489static inline void
1490pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1491{
1492 /* Initialize fields that are not bit fields in the IP header. */
1493#define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001494 _(l2_type);
1495 _(l3_type);
1496 _(n_l2_address_bytes);
1497 _(n_l3_address_bytes);
1498 _(opcode);
1499 _(ip4_over_ethernet[0].ethernet);
1500 _(ip4_over_ethernet[0].ip4);
1501 _(ip4_over_ethernet[1].ethernet);
1502 _(ip4_over_ethernet[1].ip4);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001503#undef _
1504}
1505
1506uword
1507unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1508{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001509 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1510 pg_ethernet_arp_header_t *p;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001511 u32 group_index;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001512
Ed Warnickecb9cada2015-12-08 15:45:58 -07001513 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1514 &group_index);
1515 pg_ethernet_arp_header_init (p);
1516
1517 /* Defaults. */
1518 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1519 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1520 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1521 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1522
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001523 if (!unformat (input, "%U: %U/%U -> %U/%U",
1524 unformat_pg_edit,
1525 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1526 unformat_pg_edit,
1527 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1528 unformat_pg_edit,
1529 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1530 unformat_pg_edit,
1531 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1532 unformat_pg_edit,
1533 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
Ed Warnickecb9cada2015-12-08 15:45:58 -07001534 {
1535 /* Free up any edits we may have added. */
1536 pg_free_edit_group (s);
1537 return 0;
1538 }
1539 return 1;
1540}
1541
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001542clib_error_t *
1543ip4_set_arp_limit (u32 arp_limit)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001544{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001545 ethernet_arp_main_t *am = &ethernet_arp_main;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001546
1547 am->limit_arp_cache_size = arp_limit;
1548 return 0;
1549}
1550
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001551/**
1552 * @brief Control Plane hook to remove an ARP entry
1553 */
1554int
1555vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
Neale Rannscf7efe02018-09-24 08:34:11 +00001556 u32 sw_if_index,
1557 const
1558 ethernet_arp_ip4_over_ethernet_address_t *
1559 a)
Damjan Marion102ec522016-03-29 13:18:17 +02001560{
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001561 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
Damjan Marion102ec522016-03-29 13:18:17 +02001562
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001563 args.sw_if_index = sw_if_index;
1564 args.flags = ETHERNET_ARP_ARGS_REMOVE;
Dave Barach178cf492018-11-13 16:34:13 -05001565 clib_memcpy_fast (&args.a, a, sizeof (*a));
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001566
1567 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1568 (u8 *) & args, sizeof (args));
1569 return 0;
1570}
1571
1572/**
Eyal Bari20197482017-09-13 12:29:08 +03001573 * @brief publish wildcard arp event
1574 * @param sw_if_index The interface on which the ARP entires are acted
1575 */
1576static int
Neale Rannscf7efe02018-09-24 08:34:11 +00001577vnet_arp_wc_publish (u32 sw_if_index,
1578 const ethernet_arp_ip4_over_ethernet_address_t * a)
Eyal Bari20197482017-09-13 12:29:08 +03001579{
Eyal Bari20197482017-09-13 12:29:08 +03001580 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1581 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1582 .sw_if_index = sw_if_index,
1583 .a = *a
1584 };
1585
1586 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1587 (u8 *) & args, sizeof (args));
1588 return 0;
1589}
1590
1591static void
1592vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1593 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1594 args)
1595{
1596 vlib_main_t *vm = vlib_get_main ();
1597 ethernet_arp_main_t *am = &ethernet_arp_main;
Eyal Baric125ecc2017-09-20 11:29:17 +03001598 uword ni = am->wc_ip4_arp_publisher_node;
1599 uword et = am->wc_ip4_arp_publisher_et;
1600
1601 if (ni == (uword) ~ 0)
Eyal Bari20197482017-09-13 12:29:08 +03001602 return;
1603 wc_arp_report_t *r =
Eyal Baric125ecc2017-09-20 11:29:17 +03001604 vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
Eyal Bari20197482017-09-13 12:29:08 +03001605 r->ip4 = args->a.ip4.as_u32;
1606 r->sw_if_index = args->sw_if_index;
1607 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1608}
1609
1610void
Eyal Baric125ecc2017-09-20 11:29:17 +03001611wc_arp_set_publisher_node (uword node_index, uword event_type)
Eyal Bari20197482017-09-13 12:29:08 +03001612{
1613 ethernet_arp_main_t *am = &ethernet_arp_main;
1614 am->wc_ip4_arp_publisher_node = node_index;
Eyal Baric125ecc2017-09-20 11:29:17 +03001615 am->wc_ip4_arp_publisher_et = event_type;
Eyal Bari20197482017-09-13 12:29:08 +03001616}
1617
Neale Rannscf7efe02018-09-24 08:34:11 +00001618static void
1619arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e);
1620
1621static int
1622vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1623 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1624 * args)
1625{
1626 ethernet_arp_main_t *am = &ethernet_arp_main;
1627 ethernet_arp_ip4_entry_t *e;
1628 ethernet_arp_interface_t *eai;
1629
1630 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1631 return 0;
1632
1633 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1634
1635 e = arp_entry_find (eai, &args->a.ip4);
1636
1637 if (NULL != e)
1638 {
1639 adj_nbr_walk_nh4 (e->sw_if_index,
1640 &e->ip4_address, arp_mk_incomplete_walk, e);
1641
1642 /*
1643 * The difference between flush and unset, is that an unset
1644 * means delete for static and dynamic entries. A flush
1645 * means delete only for dynamic. Flushing is what the DP
1646 * does in response to interface events. unset is only done
1647 * by the control plane.
1648 */
1649 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1650 {
1651 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1652 }
1653 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1654 {
1655 arp_entry_free (eai, e);
1656 }
1657 }
1658 return (0);
1659}
1660
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001661/*
1662 * arp_add_del_interface_address
1663 *
1664 * callback when an interface address is added or deleted
1665 */
1666static void
1667arp_add_del_interface_address (ip4_main_t * im,
1668 uword opaque,
1669 u32 sw_if_index,
1670 ip4_address_t * address,
1671 u32 address_length,
1672 u32 if_address_index, u32 is_del)
1673{
1674 /*
1675 * Flush the ARP cache of all entries covered by the address
1676 * that is being removed.
1677 */
1678 ethernet_arp_main_t *am = &ethernet_arp_main;
1679 ethernet_arp_ip4_entry_t *e;
1680
Neale Ranns177bbdc2016-11-15 09:46:51 +00001681 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001682 return;
1683
1684 if (is_del)
Damjan Marion102ec522016-03-29 13:18:17 +02001685 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001686 ethernet_arp_interface_t *eai;
1687 u32 i, *to_delete = 0;
1688 hash_pair_t *pair;
1689
1690 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1691
Neale Rannsb80c5362016-10-08 13:03:40 +01001692 /* *INDENT-OFF* */
1693 hash_foreach_pair (pair, eai->arp_entries,
1694 ({
1695 e = pool_elt_at_index(am->ip4_entry_pool,
1696 pair->value[0]);
1697 if (ip4_destination_matches_route (im, &e->ip4_address,
1698 address, address_length))
1699 {
1700 vec_add1 (to_delete, e - am->ip4_entry_pool);
1701 }
1702 }));
1703 /* *INDENT-ON* */
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001704
1705 for (i = 0; i < vec_len (to_delete); i++)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001706 {
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001707 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1708
Neale Rannscf7efe02018-09-24 08:34:11 +00001709 vnet_arp_set_ip4_over_ethernet_rpc_args_t delme = {
1710 .a.ip4.as_u32 = e->ip4_address.as_u32,
1711 .sw_if_index = e->sw_if_index,
1712 .flags = ETHERNET_ARP_ARGS_FLUSH,
1713 };
Dave Barach178cf492018-11-13 16:34:13 -05001714 clib_memcpy_fast (&delme.a.ethernet, e->ethernet_address, 6);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001715
Neale Rannscf7efe02018-09-24 08:34:11 +00001716 vnet_arp_flush_ip4_over_ethernet_internal (vnet_get_main (),
1717 &delme);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001718 }
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001719
1720 vec_free (to_delete);
Damjan Marion102ec522016-03-29 13:18:17 +02001721 }
1722}
1723
Neale Ranns15002542017-09-10 04:39:11 -07001724static void
1725arp_table_bind (ip4_main_t * im,
1726 uword opaque,
1727 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1728{
1729 ethernet_arp_main_t *am = &ethernet_arp_main;
1730 ethernet_arp_interface_t *eai;
1731 ethernet_arp_ip4_entry_t *e;
1732 hash_pair_t *pair;
1733
1734 /*
1735 * the IP table that the interface is bound to has changed.
1736 * reinstall all the adj fibs.
1737 */
1738
1739 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1740 return;
1741
1742 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1743
1744 /* *INDENT-OFF* */
1745 hash_foreach_pair (pair, eai->arp_entries,
1746 ({
1747 e = pool_elt_at_index(am->ip4_entry_pool,
1748 pair->value[0]);
1749 /*
1750 * remove the adj-fib from the old table and add to the new
1751 */
1752 arp_adj_fib_remove(e, old_fib_index);
1753 arp_adj_fib_add(e, new_fib_index);
1754 }));
1755 /* *INDENT-ON* */
1756
1757}
1758
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001759static clib_error_t *
1760ethernet_arp_init (vlib_main_t * vm)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001761{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001762 ethernet_arp_main_t *am = &ethernet_arp_main;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001763 ip4_main_t *im = &ip4_main;
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001764 clib_error_t *error;
1765 pg_node_t *pn;
Dave Barach1f49ed62016-02-24 11:29:06 -05001766
1767 if ((error = vlib_call_init_function (vm, ethernet_init)))
1768 return error;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001769
1770 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1771
1772 pn = pg_get_node (arp_input_node.index);
1773 pn->unformat_edit = unformat_pg_arp_header;
1774
1775 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1776#define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1777 foreach_ethernet_arp_opcode;
1778#undef _
1779
Ed Warnickecb9cada2015-12-08 15:45:58 -07001780 /* $$$ configurable */
1781 am->limit_arp_cache_size = 50000;
1782
1783 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1784 am->mac_changes_by_address = hash_create (0, sizeof (uword));
Eyal Bari20197482017-09-13 12:29:08 +03001785 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001786
1787 /* don't trace ARP error packets */
1788 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001789 vlib_node_runtime_t *rt =
Ed Warnickecb9cada2015-12-08 15:45:58 -07001790 vlib_node_get_runtime (vm, arp_input_node.index);
1791
1792#define _(a,b) \
1793 vnet_pcap_drop_trace_filter_add_del \
1794 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1795 1 /* is_add */);
1796 foreach_ethernet_arp_error
1797#undef _
1798 }
Damjan Marion102ec522016-03-29 13:18:17 +02001799
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001800 ip4_add_del_interface_address_callback_t cb;
1801 cb.function = arp_add_del_interface_address;
1802 cb.function_opaque = 0;
1803 vec_add1 (im->add_del_interface_address_callbacks, cb);
1804
Neale Ranns15002542017-09-10 04:39:11 -07001805 ip4_table_bind_callback_t cbt;
1806 cbt.function = arp_table_bind;
1807 cbt.function_opaque = 0;
1808 vec_add1 (im->table_bind_callbacks, cbt);
1809
Ed Warnickecb9cada2015-12-08 15:45:58 -07001810 return 0;
1811}
1812
1813VLIB_INIT_FUNCTION (ethernet_arp_init);
1814
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001815static void
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001816arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1817{
1818 ethernet_arp_main_t *am = &ethernet_arp_main;
1819
John Lo4fed5b12018-05-22 03:35:06 -04001820 arp_adj_fib_remove
1821 (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001822 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1823 pool_put (am->ip4_entry_pool, e);
1824}
1825
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001826static inline int
Ed Warnickecb9cada2015-12-08 15:45:58 -07001827vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001828 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1829 * args)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001830{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001831 ethernet_arp_main_t *am = &ethernet_arp_main;
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001832 ethernet_arp_ip4_entry_t *e;
1833 ethernet_arp_interface_t *eai;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001834
Matthew Smith66c0adf2017-08-09 16:30:43 -05001835 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1836 return 0;
1837
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001838 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
Ed Warnickecb9cada2015-12-08 15:45:58 -07001839
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001840 e = arp_entry_find (eai, &args->a.ip4);
Ed Warnickecb9cada2015-12-08 15:45:58 -07001841
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001842 if (NULL != e)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001843 {
Neale Ranns19c68d22016-12-07 15:38:14 +00001844 adj_nbr_walk_nh4 (e->sw_if_index,
Neale Rannscf7efe02018-09-24 08:34:11 +00001845 &e->ip4_address, arp_mk_incomplete_walk, e);
John Lo4fed5b12018-05-22 03:35:06 -04001846 arp_entry_free (eai, e);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001847 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07001848
Ed Warnickecb9cada2015-12-08 15:45:58 -07001849 return 0;
1850}
1851
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001852
1853static int
1854vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1855 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1856 * args)
1857{
1858 ethernet_arp_main_t *am = &ethernet_arp_main;
1859 ethernet_arp_ip4_entry_t *e;
1860 ethernet_arp_interface_t *eai;
1861
Matthew Smith66c0adf2017-08-09 16:30:43 -05001862 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001863 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1864
1865 e = arp_entry_find (eai, &args->a.ip4);
1866
1867 if (NULL != e)
1868 {
Neale Rannsb80c5362016-10-08 13:03:40 +01001869 adj_nbr_walk_nh4 (e->sw_if_index,
1870 &e->ip4_address, arp_mk_complete_walk, e);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001871 }
1872 return (0);
1873}
1874
1875static void
1876set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1877 * a)
1878{
1879 vnet_main_t *vm = vnet_get_main ();
Damjan Marion586afd72017-04-05 19:18:20 +02001880 ASSERT (vlib_get_thread_index () == 0);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001881
1882 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1883 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1884 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1885 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1886 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1887 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
Eyal Bari20197482017-09-13 12:29:08 +03001888 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1889 vnet_arp_wc_publish_internal (vm, a);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001890 else
1891 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1892}
1893
1894/**
1895 * @brief Invoked when the interface's admin state changes
1896 */
1897static clib_error_t *
1898ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1899 u32 sw_if_index, u32 flags)
1900{
1901 ethernet_arp_main_t *am = &ethernet_arp_main;
1902 ethernet_arp_ip4_entry_t *e;
Neale Rannscf7efe02018-09-24 08:34:11 +00001903 u32 i, *to_update = 0;
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001904
1905 /* *INDENT-OFF* */
1906 pool_foreach (e, am->ip4_entry_pool,
1907 ({
1908 if (e->sw_if_index == sw_if_index)
Neale Rannscf7efe02018-09-24 08:34:11 +00001909 vec_add1 (to_update,
Neale Rannsb80c5362016-10-08 13:03:40 +01001910 e - am->ip4_entry_pool);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001911 }));
1912 /* *INDENT-ON* */
1913
Neale Rannscf7efe02018-09-24 08:34:11 +00001914 for (i = 0; i < vec_len (to_update); i++)
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001915 {
Neale Rannscf7efe02018-09-24 08:34:11 +00001916 e = pool_elt_at_index (am->ip4_entry_pool, to_update[i]);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001917
Neale Rannscf7efe02018-09-24 08:34:11 +00001918 vnet_arp_set_ip4_over_ethernet_rpc_args_t update_me = {
1919 .a.ip4.as_u32 = e->ip4_address.as_u32,
1920 .sw_if_index = e->sw_if_index,
1921 };
1922
Dave Barach178cf492018-11-13 16:34:13 -05001923 clib_memcpy_fast (&update_me.a.ethernet, e->ethernet_address, 6);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001924
1925 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1926 {
Neale Rannscf7efe02018-09-24 08:34:11 +00001927 update_me.flags = ETHERNET_ARP_ARGS_POPULATE;
1928 vnet_arp_populate_ip4_over_ethernet_internal (vnm, &update_me);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001929 }
1930 else
1931 {
Neale Rannscf7efe02018-09-24 08:34:11 +00001932 update_me.flags = ETHERNET_ARP_ARGS_FLUSH;
1933 vnet_arp_flush_ip4_over_ethernet_internal (vnm, &update_me);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001934 }
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001935 }
Neale Rannscf7efe02018-09-24 08:34:11 +00001936 vec_free (to_update);
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001937
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001938 return 0;
1939}
1940
1941VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1942
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001943static void
1944increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001945{
1946 u8 old;
1947 int i;
1948
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001949 for (i = 3; i >= 0; i--)
Ed Warnickecb9cada2015-12-08 15:45:58 -07001950 {
1951 old = a->ip4.as_u8[i];
1952 a->ip4.as_u8[i] += 1;
1953 if (old < a->ip4.as_u8[i])
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001954 break;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001955 }
1956
1957 for (i = 5; i >= 0; i--)
1958 {
1959 old = a->ethernet[i];
1960 a->ethernet[i] += 1;
1961 if (old < a->ethernet[i])
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001962 break;
Ed Warnickecb9cada2015-12-08 15:45:58 -07001963 }
1964}
1965
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001966int
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001967vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
Neale Rannscf7efe02018-09-24 08:34:11 +00001968 u32 sw_if_index,
1969 const ethernet_arp_ip4_over_ethernet_address_t
1970 * a, int is_static, int is_no_fib_entry)
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001971{
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001972 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1973
1974 args.sw_if_index = sw_if_index;
1975 args.is_static = is_static;
Neale Rannsb3b2de72017-03-08 05:17:22 -08001976 args.is_no_fib_entry = is_no_fib_entry;
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001977 args.flags = 0;
Dave Barach178cf492018-11-13 16:34:13 -05001978 clib_memcpy_fast (&args.a, a, sizeof (*a));
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001979
1980 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1981 (u8 *) & args, sizeof (args));
1982 return 0;
1983}
1984
Neale Ranns0053de62018-05-22 08:40:52 -07001985void
1986proxy_arp_walk (proxy_arp_walk_t cb, void *data)
1987{
1988 ethernet_arp_main_t *am = &ethernet_arp_main;
1989 ethernet_proxy_arp_t *pa;
1990
1991 vec_foreach (pa, am->proxy_arps)
1992 {
1993 if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
1994 break;
1995 }
1996}
1997
Neale Ranns0bfe5d82016-08-25 15:29:12 +01001998int
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07001999vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
2000 ip4_address_t * hi_addr, u32 fib_index, int is_del)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002001{
2002 ethernet_arp_main_t *am = &ethernet_arp_main;
2003 ethernet_proxy_arp_t *pa;
2004 u32 found_at_index = ~0;
2005
2006 vec_foreach (pa, am->proxy_arps)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002007 {
Neale Ranns0053de62018-05-22 08:40:52 -07002008 if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2009 pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002010 {
2011 found_at_index = pa - am->proxy_arps;
2012 break;
2013 }
2014 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002015
2016 if (found_at_index != ~0)
2017 {
2018 /* Delete, otherwise it's already in the table */
2019 if (is_del)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002020 vec_delete (am->proxy_arps, 1, found_at_index);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002021 return 0;
2022 }
2023 /* delete, no such entry */
2024 if (is_del)
2025 return VNET_API_ERROR_NO_SUCH_ENTRY;
2026
2027 /* add, not in table */
2028 vec_add2 (am->proxy_arps, pa, 1);
Neale Ranns0053de62018-05-22 08:40:52 -07002029 pa->lo_addr.as_u32 = lo_addr->as_u32;
2030 pa->hi_addr.as_u32 = hi_addr->as_u32;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002031 pa->fib_index = fib_index;
2032 return 0;
2033}
2034
2035/*
Damjan Marion607de1a2016-08-16 22:53:54 +02002036 * Remove any proxy arp entries asdociated with the
Ed Warnickecb9cada2015-12-08 15:45:58 -07002037 * specificed fib.
2038 */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002039int
2040vnet_proxy_arp_fib_reset (u32 fib_id)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002041{
Ed Warnickecb9cada2015-12-08 15:45:58 -07002042 ethernet_arp_main_t *am = &ethernet_arp_main;
2043 ethernet_proxy_arp_t *pa;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002044 u32 *entries_to_delete = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002045 u32 fib_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002046 int i;
2047
Neale Ranns107e7d42017-04-11 09:55:19 -07002048 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2049 if (~0 == fib_index)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002050 return VNET_API_ERROR_NO_SUCH_ENTRY;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002051
2052 vec_foreach (pa, am->proxy_arps)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002053 {
2054 if (pa->fib_index == fib_index)
2055 {
2056 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2057 }
2058 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002059
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002060 for (i = 0; i < vec_len (entries_to_delete); i++)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002061 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002062 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2063 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002064
2065 vec_free (entries_to_delete);
2066
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002067 return 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002068}
2069
2070static clib_error_t *
2071ip_arp_add_del_command_fn (vlib_main_t * vm,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002072 unformat_input_t * input, vlib_cli_command_t * cmd)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002073{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002074 vnet_main_t *vnm = vnet_get_main ();
Ed Warnickecb9cada2015-12-08 15:45:58 -07002075 u32 sw_if_index;
2076 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2077 int addr_valid = 0;
2078 int is_del = 0;
2079 int count = 1;
2080 u32 fib_index = 0;
2081 u32 fib_id;
2082 int is_static = 0;
Neale Rannsb3b2de72017-03-08 05:17:22 -08002083 int is_no_fib_entry = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002084 int is_proxy = 0;
2085
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002086 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002087 {
2088 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2089 if (unformat (input, "%U %U %U",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002090 unformat_vnet_sw_interface, vnm, &sw_if_index,
2091 unformat_ip4_address, &addr.ip4,
2092 unformat_ethernet_address, &addr.ethernet))
2093 addr_valid = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002094
2095 else if (unformat (input, "delete") || unformat (input, "del"))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002096 is_del = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002097
2098 else if (unformat (input, "static"))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002099 is_static = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002100
Neale Rannsb3b2de72017-03-08 05:17:22 -08002101 else if (unformat (input, "no-fib-entry"))
2102 is_no_fib_entry = 1;
2103
Ed Warnickecb9cada2015-12-08 15:45:58 -07002104 else if (unformat (input, "count %d", &count))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002105 ;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002106
2107 else if (unformat (input, "fib-id %d", &fib_id))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002108 {
Neale Ranns107e7d42017-04-11 09:55:19 -07002109 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2110
2111 if (~0 == fib_index)
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002112 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002113 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002114
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002115 else if (unformat (input, "proxy %U - %U",
2116 unformat_ip4_address, &lo_addr.ip4,
2117 unformat_ip4_address, &hi_addr.ip4))
2118 is_proxy = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002119 else
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002120 break;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002121 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002122
Ed Warnickecb9cada2015-12-08 15:45:58 -07002123 if (is_proxy)
2124 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002125 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2126 fib_index, is_del);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002127 return 0;
2128 }
2129
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002130 if (addr_valid)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002131 {
2132 int i;
2133
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002134 for (i = 0; i < count; i++)
2135 {
2136 if (is_del == 0)
2137 {
2138 uword event_type, *event_data = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002139
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002140 /* Park the debug CLI until the arp entry is installed */
2141 vnet_register_ip4_arp_resolution_event
2142 (vnm, &addr.ip4, vlib_current_process (vm),
2143 1 /* type */ , 0 /* data */ );
Ed Warnickecb9cada2015-12-08 15:45:58 -07002144
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002145 vnet_arp_set_ip4_over_ethernet
Neale Rannsb3b2de72017-03-08 05:17:22 -08002146 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002147
2148 vlib_process_wait_for_event (vm);
2149 event_type = vlib_process_get_events (vm, &event_data);
2150 vec_reset_length (event_data);
2151 if (event_type != 1)
2152 clib_warning ("event type %d unexpected", event_type);
2153 }
2154 else
Neale Ranns0bfe5d82016-08-25 15:29:12 +01002155 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002156
2157 increment_ip4_and_mac_address (&addr);
2158 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002159 }
2160 else
2161 {
2162 return clib_error_return (0, "unknown input `%U'",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002163 format_unformat_error, input);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002164 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002165
Ed Warnickecb9cada2015-12-08 15:45:58 -07002166 return 0;
2167}
2168
Neale Rannsb80c5362016-10-08 13:03:40 +01002169/* *INDENT-OFF* */
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002170/*?
Billy McFall2d085d92016-09-13 21:47:55 -04002171 * Add or delete IPv4 ARP cache entries.
2172 *
2173 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2174 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2175 * any order and combination.
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002176 *
2177 * @cliexpar
Billy McFall2d085d92016-09-13 21:47:55 -04002178 * @parblock
2179 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2180 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2181 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2182 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2183 *
2184 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2185 * table:
2186 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2187 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2188 *
2189 * Add or delete IPv4 static ARP cache entries as follows:
2190 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2191 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2192 *
2193 * For testing / debugging purposes, the 'set ip arp' command can add or
2194 * delete multiple entries. Supply the 'count N' parameter:
2195 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2196 * @endparblock
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002197 ?*/
Ed Warnickecb9cada2015-12-08 15:45:58 -07002198VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002199 .path = "set ip arp",
2200 .short_help =
Neale Rannsb3b2de72017-03-08 05:17:22 -08002201 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002202 .function = ip_arp_add_del_command_fn,
Ed Warnickecb9cada2015-12-08 15:45:58 -07002203};
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002204/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002205
2206static clib_error_t *
2207set_int_proxy_arp_command_fn (vlib_main_t * vm,
Neale Rannsb80c5362016-10-08 13:03:40 +01002208 unformat_input_t *
2209 input, vlib_cli_command_t * cmd)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002210{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002211 vnet_main_t *vnm = vnet_get_main ();
Ed Warnickecb9cada2015-12-08 15:45:58 -07002212 u32 sw_if_index;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002213 vnet_sw_interface_t *si;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002214 int enable = 0;
2215 int intfc_set = 0;
2216
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002217 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002218 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002219 if (unformat (input, "%U", unformat_vnet_sw_interface,
2220 vnm, &sw_if_index))
2221 intfc_set = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002222 else if (unformat (input, "enable") || unformat (input, "on"))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002223 enable = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002224 else if (unformat (input, "disable") || unformat (input, "off"))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002225 enable = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002226 else
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002227 break;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002228 }
2229
2230 if (intfc_set == 0)
2231 return clib_error_return (0, "unknown input '%U'",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002232 format_unformat_error, input);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002233
2234 si = vnet_get_sw_interface (vnm, sw_if_index);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002235 ASSERT (si);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002236 if (enable)
2237 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002238 else
Ed Warnickecb9cada2015-12-08 15:45:58 -07002239 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002240
Ed Warnickecb9cada2015-12-08 15:45:58 -07002241 return 0;
2242}
2243
Neale Rannsb80c5362016-10-08 13:03:40 +01002244/* *INDENT-OFF* */
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002245/*?
Billy McFall2d085d92016-09-13 21:47:55 -04002246 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2247 * requests for the indicated address range. Multiple proxy-arp
2248 * ranges may be provisioned.
2249 *
2250 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2251 * Also, the underlying implementation has not been performance-tuned.
2252 * Avoid creating an unnecessarily large set of ranges.
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002253 *
2254 * @cliexpar
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002255 * To enable proxy arp on a range of addresses, use:
Billy McFall2d085d92016-09-13 21:47:55 -04002256 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2257 * Append 'del' to delete a range of proxy ARP addresses:
2258 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2259 * You must then specifically enable proxy arp on individual interfaces:
2260 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2261 * To disable proxy arp on an individual interface:
2262 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
Keith Burns (alagalah)6ef7bb92016-09-10 14:55:04 -07002263 ?*/
Ed Warnickecb9cada2015-12-08 15:45:58 -07002264VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002265 .path = "set interface proxy-arp",
2266 .short_help =
Neale Rannsb80c5362016-10-08 13:03:40 +01002267 "set interface proxy-arp <intfc> [enable|disable]",
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002268 .function = set_int_proxy_arp_command_fn,
Ed Warnickecb9cada2015-12-08 15:45:58 -07002269};
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002270/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002271
2272
2273/*
John Lo1edfba92016-08-27 01:11:57 -04002274 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2275 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
Ed Warnickecb9cada2015-12-08 15:45:58 -07002276 */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002277typedef enum
2278{
Ed Warnickecb9cada2015-12-08 15:45:58 -07002279 ARP_TERM_NEXT_L2_OUTPUT,
2280 ARP_TERM_NEXT_DROP,
2281 ARP_TERM_N_NEXT,
2282} arp_term_next_t;
2283
2284u32 arp_term_next_node_index[32];
2285
2286static uword
2287arp_term_l2bd (vlib_main_t * vm,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002288 vlib_node_runtime_t * node, vlib_frame_t * frame)
Ed Warnickecb9cada2015-12-08 15:45:58 -07002289{
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002290 l2input_main_t *l2im = &l2input_main;
2291 u32 n_left_from, next_index, *from, *to_next;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002292 u32 n_replies_sent = 0;
2293 u16 last_bd_index = ~0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002294 l2_bridge_domain_t *last_bd_config = 0;
2295 l2_input_config_t *cfg0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002296
2297 from = vlib_frame_vector_args (frame);
2298 n_left_from = frame->n_vectors;
2299 next_index = node->cached_next_index;
2300
2301 while (n_left_from > 0)
2302 {
2303 u32 n_left_to_next;
2304
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002305 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002306
2307 while (n_left_from > 0 && n_left_to_next > 0)
2308 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002309 vlib_buffer_t *p0;
2310 ethernet_header_t *eth0;
2311 ethernet_arp_header_t *arp0;
John Lo1edfba92016-08-27 01:11:57 -04002312 ip6_header_t *iph0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002313 u8 *l3h0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002314 u32 pi0, error0, next0, sw_if_index0;
2315 u16 ethertype0;
2316 u16 bd_index0;
2317 u32 ip0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002318 u8 *macp0;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002319
2320 pi0 = from[0];
2321 to_next[0] = pi0;
2322 from += 1;
2323 to_next += 1;
2324 n_left_from -= 1;
2325 n_left_to_next -= 1;
2326
2327 p0 = vlib_get_buffer (vm, pi0);
Eyal Baria0623f82017-03-30 03:05:06 +03002328 // Terminate only local (SHG == 0) ARP
2329 if (vnet_buffer (p0)->l2.shg != 0)
2330 goto next_l2_feature;
2331
Ed Warnickecb9cada2015-12-08 15:45:58 -07002332 eth0 = vlib_buffer_get_current (p0);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002333 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2334 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
Ed Warnickecb9cada2015-12-08 15:45:58 -07002335 arp0 = (ethernet_arp_header_t *) l3h0;
2336
John Lo0e6f4d62018-07-13 17:29:58 -04002337 if (ethertype0 != ETHERNET_TYPE_ARP)
John Lo1edfba92016-08-27 01:11:57 -04002338 goto check_ip6_nd;
2339
John Lo0e6f4d62018-07-13 17:29:58 -04002340 if ((arp0->opcode !=
2341 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
2342 (arp0->opcode !=
2343 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
2344 goto check_ip6_nd;
2345
2346 /* Must be ARP request/reply packet here */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002347 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2348 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2349 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002350 u8 *t0 = vlib_add_trace (vm, node, p0,
2351 sizeof (ethernet_arp_input_trace_t));
Dave Barach178cf492018-11-13 16:34:13 -05002352 clib_memcpy_fast (t0, l3h0,
2353 sizeof (ethernet_arp_input_trace_t));
Ed Warnickecb9cada2015-12-08 15:45:58 -07002354 }
2355
John Lo0e6f4d62018-07-13 17:29:58 -04002356 error0 = 0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002357 error0 =
2358 (arp0->l2_type !=
Neale Rannsb80c5362016-10-08 13:03:40 +01002359 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2360 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002361 error0 =
2362 (arp0->l3_type !=
2363 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2364 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002365
2366 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2367
2368 if (error0)
2369 goto drop;
2370
John Lo1edfba92016-08-27 01:11:57 -04002371 /* Trash ARP packets whose ARP-level source addresses do not
John Lo0131b6c2018-06-25 12:35:21 -04002372 match, or if requester address is mcast */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002373 if (PREDICT_FALSE
Matthew Smithcb9ab472017-05-16 21:35:56 -05002374 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
John Lo0131b6c2018-06-25 12:35:21 -04002375 sizeof (eth0->src_address)) ||
2376 ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet)))
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002377 {
John Lo0e6f4d62018-07-13 17:29:58 -04002378 /* VRRP virtual MAC may be different to SMAC in ARP reply */
2379 if (memcmp (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2380 sizeof (vrrp_prefix)))
2381 {
2382 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2383 goto drop;
2384 }
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002385 }
John Lo0131b6c2018-06-25 12:35:21 -04002386 if (PREDICT_FALSE
2387 (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
2388 {
2389 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
2390 goto drop;
2391 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002392
John Lo1edfba92016-08-27 01:11:57 -04002393 /* Check if anyone want ARP request events for L2 BDs */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002394 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002395 ethernet_arp_main_t *am = &ethernet_arp_main;
Eyal Bari20197482017-09-13 12:29:08 +03002396 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2397 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002398 }
2399
John Lo1edfba92016-08-27 01:11:57 -04002400 /* lookup BD mac_by_ip4 hash table for MAC entry */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002401 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002402 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2403 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2404 || (last_bd_index == (u16) ~ 0)))
Ed Warnickecb9cada2015-12-08 15:45:58 -07002405 {
2406 last_bd_index = bd_index0;
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002407 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002408 }
2409 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2410
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002411 if (PREDICT_FALSE (!macp0))
John Lo1edfba92016-08-27 01:11:57 -04002412 goto next_l2_feature; /* MAC not found */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002413
John Lo1edfba92016-08-27 01:11:57 -04002414 /* MAC found, send ARP reply -
2415 Convert ARP request packet to ARP reply */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002416 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2417 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2418 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
Dave Barach178cf492018-11-13 16:34:13 -05002419 clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2420 clib_memcpy_fast (eth0->dst_address, eth0->src_address, 6);
2421 clib_memcpy_fast (eth0->src_address, macp0, 6);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002422 n_replies_sent += 1;
2423
John Lo1edfba92016-08-27 01:11:57 -04002424 output_response:
2425 /* For BVI, need to use l2-fwd node to send ARP reply as
2426 l2-output node cannot output packet to BVI properly */
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002427 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002428 if (PREDICT_FALSE (cfg0->bvi))
2429 {
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002430 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
Ed Warnickecb9cada2015-12-08 15:45:58 -07002431 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2432 goto next_l2_feature;
2433 }
2434
John Lo1edfba92016-08-27 01:11:57 -04002435 /* Send ARP/ND reply back out input interface through l2-output */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002436 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2437 next0 = ARP_TERM_NEXT_L2_OUTPUT;
Neale Rannsb80c5362016-10-08 13:03:40 +01002438 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2439 to_next, n_left_to_next, pi0,
2440 next0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002441 continue;
2442
John Lo1edfba92016-08-27 01:11:57 -04002443 check_ip6_nd:
2444 /* IP6 ND event notification or solicitation handling to generate
2445 local response instead of flooding */
2446 iph0 = (ip6_header_t *) l3h0;
2447 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2448 iph0->protocol == IP_PROTOCOL_ICMP6 &&
John Lo1edfba92016-08-27 01:11:57 -04002449 !ip6_address_is_unspecified
2450 (&iph0->src_address)))
2451 {
2452 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
Neale Rannsb80c5362016-10-08 13:03:40 +01002453 if (vnet_ip6_nd_term
2454 (vm, node, p0, eth0, iph0, sw_if_index0,
Eyal Baria0623f82017-03-30 03:05:06 +03002455 vnet_buffer (p0)->l2.bd_index))
John Lo1edfba92016-08-27 01:11:57 -04002456 goto output_response;
2457 }
2458
Ed Warnickecb9cada2015-12-08 15:45:58 -07002459 next_l2_feature:
2460 {
John Lobeb0b2e2017-07-22 00:21:36 -04002461 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2462 L2INPUT_FEAT_ARP_TERM);
Neale Rannsb80c5362016-10-08 13:03:40 +01002463 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2464 to_next, n_left_to_next,
2465 pi0, next0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002466 continue;
2467 }
2468
2469 drop:
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002470 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2471 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2472 arp0->ip4_over_ethernet[1].ip4.as_u32))
2473 {
2474 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2475 }
Ed Warnickecb9cada2015-12-08 15:45:58 -07002476 next0 = ARP_TERM_NEXT_DROP;
2477 p0->error = node->errors[error0];
2478
Neale Rannsb80c5362016-10-08 13:03:40 +01002479 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2480 to_next, n_left_to_next, pi0,
2481 next0);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002482 }
2483
2484 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2485 }
2486
2487 vlib_error_count (vm, node->node_index,
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002488 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002489 return frame->n_vectors;
2490}
2491
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002492/* *INDENT-OFF* */
2493VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
Ed Warnickecb9cada2015-12-08 15:45:58 -07002494 .function = arp_term_l2bd,
2495 .name = "arp-term-l2bd",
2496 .vector_size = sizeof (u32),
Ed Warnickecb9cada2015-12-08 15:45:58 -07002497 .n_errors = ETHERNET_ARP_N_ERROR,
2498 .error_strings = ethernet_arp_error_strings,
Ed Warnickecb9cada2015-12-08 15:45:58 -07002499 .n_next_nodes = ARP_TERM_N_NEXT,
2500 .next_nodes = {
2501 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2502 [ARP_TERM_NEXT_DROP] = "error-drop",
2503 },
Ed Warnickecb9cada2015-12-08 15:45:58 -07002504 .format_buffer = format_ethernet_arp_header,
John Lo1edfba92016-08-27 01:11:57 -04002505 .format_trace = format_arp_term_input_trace,
Ed Warnickecb9cada2015-12-08 15:45:58 -07002506};
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002507/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -07002508
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002509clib_error_t *
2510arp_term_init (vlib_main_t * vm)
Neale Rannsb80c5362016-10-08 13:03:40 +01002511{
2512 // Initialize the feature next-node indexes
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002513 feat_bitmap_init_next_nodes (vm,
2514 arp_term_l2bd_node.index,
2515 L2INPUT_N_FEAT,
2516 l2input_get_feat_names (),
2517 arp_term_next_node_index);
Ed Warnickecb9cada2015-12-08 15:45:58 -07002518 return 0;
2519}
2520
2521VLIB_INIT_FUNCTION (arp_term_init);
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002522
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002523void
2524change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2525{
2526 if (e->sw_if_index == sw_if_index)
2527 {
Neale Rannsb80c5362016-10-08 13:03:40 +01002528 adj_nbr_walk_nh4 (e->sw_if_index,
2529 &e->ip4_address, arp_mk_complete_walk, e);
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002530 }
2531}
2532
2533void
Neale Ranns3be6b282016-12-20 14:24:01 +00002534ethernet_arp_change_mac (u32 sw_if_index)
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002535{
2536 ethernet_arp_main_t *am = &ethernet_arp_main;
2537 ethernet_arp_ip4_entry_t *e;
Neale Rannsc819fc62018-02-16 02:44:05 -08002538 adj_index_t ai;
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002539
2540 /* *INDENT-OFF* */
2541 pool_foreach (e, am->ip4_entry_pool,
Neale Rannsb80c5362016-10-08 13:03:40 +01002542 ({
2543 change_arp_mac (sw_if_index, e);
2544 }));
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002545 /* *INDENT-ON* */
Neale Rannsc819fc62018-02-16 02:44:05 -08002546
2547 ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2548
2549 if (ADJ_INDEX_INVALID != ai)
2550 adj_glean_update_rewrite (ai);
Pavel Kotucekc631f2d2016-09-26 10:40:02 +02002551}
2552
John Lo7e9743a2017-09-23 08:59:58 -04002553void
Steven9f781d82018-06-05 11:09:32 -07002554send_ip4_garp (vlib_main_t * vm, u32 sw_if_index)
Neale Ranns25b04942018-04-04 09:34:50 -07002555{
2556 ip4_main_t *i4m = &ip4_main;
Steven9f781d82018-06-05 11:09:32 -07002557 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
Neale Ranns25b04942018-04-04 09:34:50 -07002558
Steven9f781d82018-06-05 11:09:32 -07002559 send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
Neale Ranns25b04942018-04-04 09:34:50 -07002560}
2561
2562void
2563send_ip4_garp_w_addr (vlib_main_t * vm,
Steven9f781d82018-06-05 11:09:32 -07002564 const ip4_address_t * ip4_addr, u32 sw_if_index)
John Lo8b81cb42017-06-26 01:40:20 -04002565{
2566 ip4_main_t *i4m = &ip4_main;
Steven9f781d82018-06-05 11:09:32 -07002567 vnet_main_t *vnm = vnet_get_main ();
2568 u8 *rewrite, rewrite_len;
2569 vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
John Lo8b81cb42017-06-26 01:40:20 -04002570
2571 if (ip4_addr)
2572 {
2573 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2574 format_ip4_address, ip4_addr, sw_if_index);
2575
2576 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2577 where the interface IP/MAC pair is used for both source and request
2578 MAC/IP pairs in the request */
2579 u32 bi = 0;
2580 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2581 (vm, &i4m->ip4_arp_request_packet_template, &bi);
John Lo084606b2018-06-19 15:27:48 -04002582
2583 if (!h)
2584 return;
2585
Dave Barach178cf492018-11-13 16:34:13 -05002586 clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2587 sizeof (h->ip4_over_ethernet[0].ethernet));
2588 clib_memcpy_fast (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2589 sizeof (h->ip4_over_ethernet[1].ethernet));
John Lo8b81cb42017-06-26 01:40:20 -04002590 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2591 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2592
2593 /* Setup MAC header with ARP Etype and broadcast DMAC */
2594 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
Steven9f781d82018-06-05 11:09:32 -07002595 rewrite =
2596 ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2597 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST);
2598 rewrite_len = vec_len (rewrite);
2599 vlib_buffer_advance (b, -rewrite_len);
John Lo8b81cb42017-06-26 01:40:20 -04002600 ethernet_header_t *e = vlib_buffer_get_current (b);
Dave Barach178cf492018-11-13 16:34:13 -05002601 clib_memcpy_fast (e->dst_address, rewrite, rewrite_len);
Steven9f781d82018-06-05 11:09:32 -07002602 vec_free (rewrite);
John Lo8b81cb42017-06-26 01:40:20 -04002603
2604 /* Send GARP packet out the specified interface */
2605 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2606 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2607 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2608 u32 *to_next = vlib_frame_vector_args (f);
2609 to_next[0] = bi;
2610 f->n_vectors = 1;
2611 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2612 }
2613}
2614
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002615/*
Pavel Kotucek18934e62018-11-14 09:24:16 +01002616 * Remove any arp entries asociated with the specificed interface
2617 */
2618void
2619vnet_arp_delete_sw_interface (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
2620{
2621 if (!is_add && sw_if_index != ~0)
2622 {
2623 ethernet_arp_main_t *am = &ethernet_arp_main;
2624 ethernet_arp_ip4_entry_t *e;
2625 /* *INDENT-OFF* */
2626 pool_foreach (e, am->ip4_entry_pool, ({
2627 if (e->sw_if_index != sw_if_index)
2628 continue;
2629 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = { .sw_if_index = sw_if_index,
2630 .a.ip4 = e->ip4_address };
2631 vnet_arp_unset_ip4_over_ethernet_internal (vnm, &args);
2632 }));
2633 /* *INDENT-ON* */
2634 }
2635}
2636
2637VNET_SW_INTERFACE_ADD_DEL_FUNCTION (vnet_arp_delete_sw_interface);
2638
2639/*
Keith Burns (alagalah)e70dcc82016-08-15 18:33:19 -07002640 * fd.io coding-style-patch-verification: ON
2641 *
2642 * Local Variables:
2643 * eval: (c-set-style "gnu")
2644 * End:
2645 */