2 * proxy_node.c: dhcp proxy node processing
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/dhcp/dhcp_proxy.h>
21 #include <vnet/dhcp/client.h>
22 #include <vnet/fib/ip4_fib.h>
24 static char *dhcp_proxy_error_strings[] = {
25 #define dhcp_proxy_error(n,s) s,
26 #include <vnet/dhcp/dhcp4_proxy_error.def>
27 #undef dhcp_proxy_error
30 #define foreach_dhcp_proxy_to_server_input_next \
31 _ (DROP, "error-drop") \
32 _ (LOOKUP, "ip4-lookup") \
33 _ (SEND_TO_CLIENT, "dhcp-proxy-to-client")
37 #define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
38 foreach_dhcp_proxy_to_server_input_next
40 DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
41 } dhcp_proxy_to_server_input_next_t;
45 /* 0 => to server, 1 => to client */
47 ip4_address_t trace_ip4_address;
50 u32 original_sw_if_index;
53 #define VPP_DHCP_OPTION82_SUB1_SIZE 6
54 #define VPP_DHCP_OPTION82_SUB5_SIZE 6
55 #define VPP_DHCP_OPTION82_VSS_SIZE 12
56 #define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
57 VPP_DHCP_OPTION82_SUB5_SIZE + \
58 VPP_DHCP_OPTION82_VSS_SIZE +3)
60 static vlib_node_registration_t dhcp_proxy_to_server_node;
61 static vlib_node_registration_t dhcp_proxy_to_client_node;
64 format_dhcp_proxy_trace (u8 * s, va_list * args)
66 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
67 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
68 dhcp_proxy_trace_t *t = va_arg (*args, dhcp_proxy_trace_t *);
71 s = format (s, "DHCP proxy: sent to server %U\n",
72 format_ip4_address, &t->trace_ip4_address, t->error);
74 s = format (s, "DHCP proxy: broadcast to client from %U\n",
75 format_ip4_address, &t->trace_ip4_address);
77 if (t->error != (u32) ~ 0)
78 s = format (s, " error: %s\n", dhcp_proxy_error_strings[t->error]);
80 s = format (s, " original_sw_if_index: %d, sw_if_index: %d\n",
81 t->original_sw_if_index, t->sw_if_index);
87 format_dhcp_proxy_header_with_length (u8 * s, va_list * args)
89 dhcp_header_t *h = va_arg (*args, dhcp_header_t *);
90 u32 max_header_bytes = va_arg (*args, u32);
93 header_bytes = sizeof (h[0]);
94 if (max_header_bytes != 0 && header_bytes > max_header_bytes)
95 return format (s, "dhcp header truncated");
97 s = format (s, "DHCP Proxy");
103 dhcp_proxy_to_server_input (vlib_main_t * vm,
104 vlib_node_runtime_t * node,
105 vlib_frame_t * from_frame)
107 u32 n_left_from, next_index, *from, *to_next;
108 dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
109 from = vlib_frame_vector_args (from_frame);
110 n_left_from = from_frame->n_vectors;
111 u32 pkts_to_server = 0, pkts_to_client = 0, pkts_no_server = 0;
112 u32 pkts_no_interface_address = 0;
113 u32 pkts_too_big = 0;
114 ip4_main_t *im = &ip4_main;
116 next_index = node->cached_next_index;
118 while (n_left_from > 0)
122 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
124 while (n_left_from > 0 && n_left_to_next > 0)
134 u32 error0 = (u32) ~ 0;
136 u32 original_sw_if_index = 0;
139 dhcp_server_t *server;
141 dhcp_option_t *o, *end;
150 b0 = vlib_get_buffer (vm, bi0);
152 h0 = vlib_buffer_get_current (b0);
155 * udp_local hands us the DHCP header, need udp hdr,
156 * ip hdr to relay to server
158 vlib_buffer_advance (b0, -(sizeof (*u0)));
159 u0 = vlib_buffer_get_current (b0);
161 /* This blows. Return traffic has src_port = 67, dst_port = 67 */
163 clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_server))
165 vlib_buffer_advance (b0, sizeof (*u0));
166 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
172 rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
173 fib_index = im->fib_index_by_sw_if_index[rx_sw_if_index];
174 proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
176 if (PREDICT_FALSE (NULL == proxy))
178 error0 = DHCP_PROXY_ERROR_NO_SERVER;
179 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
184 space_left = vlib_buffer_chain_linearize (vm, b0);
185 /* cant parse chains...
186 * and we need some space for option 82*/
187 if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 ||
188 space_left < VPP_DHCP_OPTION82_SIZE)
190 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
191 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
196 server = &proxy->dhcp_servers[0];
197 vlib_buffer_advance (b0, -(sizeof (*ip0)));
198 ip0 = vlib_buffer_get_current (b0);
200 /* disable UDP checksum */
202 sum0 = ip0->checksum;
203 old0 = ip0->dst_address.as_u32;
204 new0 = server->dhcp_server.ip4.as_u32;
205 ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
206 sum0 = ip_csum_update (sum0, old0, new0,
207 ip4_header_t /* structure */ ,
208 dst_address /* changed member */ );
209 ip0->checksum = ip_csum_fold (sum0);
211 sum0 = ip0->checksum;
212 old0 = ip0->src_address.as_u32;
213 new0 = proxy->dhcp_src_address.ip4.as_u32;
214 ip0->src_address.as_u32 = new0;
215 sum0 = ip_csum_update (sum0, old0, new0,
216 ip4_header_t /* structure */ ,
217 src_address /* changed member */ );
218 ip0->checksum = ip_csum_fold (sum0);
220 /* Send to DHCP server via the configured FIB */
221 vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index;
223 h0->gateway_ip_address = proxy->dhcp_src_address.ip4;
227 end = (void *) vlib_buffer_get_tail (b0);
229 /* TLVs are not performance-friendly... */
230 while (o->option != DHCP_PACKET_OPTION_END && o < end)
232 if (DHCP_PACKET_OPTION_MSG_TYPE == o->option)
234 if (DHCP_PACKET_DISCOVER == o->data[0])
239 o = (dhcp_option_t *) (o->data + o->length);
242 if (o->option == DHCP_PACKET_OPTION_END && o <= end)
244 vnet_main_t *vnm = vnet_get_main ();
246 ip4_address_t _ia0, *ia0 = &_ia0;
248 vnet_sw_interface_t *swif;
250 original_sw_if_index = sw_if_index =
251 vnet_buffer (b0)->sw_if_index[VLIB_RX];
252 swif = vnet_get_sw_interface (vnm, sw_if_index);
253 if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
254 sw_if_index = swif->unnumbered_sw_if_index;
257 * Get the first ip4 address on the [client-side]
258 * RX interface, if not unnumbered. otherwise use
259 * the loopback interface's ip address.
261 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
265 error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
266 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
267 pkts_no_interface_address++;
272 o->option = 82; /* option 82 */
273 o->length = 12; /* 12 octets to follow */
274 o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */
275 o->data[1] = 4; /* length of suboption */
276 u32 *o_ifid = (u32 *) & o->data[2];
277 *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
278 o->data[6] = 5; /* suboption 5 (client RX intfc address) */
279 o->data[7] = 4; /* length 4 */
280 u32 *o_addr = (u32 *) & o->data[8];
281 *o_addr = ia0->as_u32;
282 o->data[12] = DHCP_PACKET_OPTION_END;
284 vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
287 u32 id_len; /* length of VPN ID */
289 if (vss->vss_type == VSS_TYPE_VPN_ID)
291 id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */
292 memcpy (&o->data[15], vss->vpn_id, id_len);
294 else if (vss->vss_type == VSS_TYPE_ASCII)
296 id_len = vec_len (vss->vpn_ascii_id);
297 memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
299 else /* must be VSS_TYPE_DEFAULT, no VPN ID */
302 o->data[12] = 151; /* vss suboption */
303 o->data[13] = id_len + 1; /* length: vss_type + id_len */
304 o->data[14] = vss->vss_type; /* vss option type */
305 o->data[15 + id_len] = 152; /* vss control suboption */
306 o->data[16 + id_len] = 0; /* length */
307 o->data[17 + id_len] = DHCP_PACKET_OPTION_END; /* "end-of-options" (0xFF) */
308 /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
309 o->length += id_len + 5;
313 b0->current_length += len;
314 /* Fix IP header length and checksum */
315 old_l0 = ip0->length;
316 new_l0 = clib_net_to_host_u16 (old_l0);
318 new_l0 = clib_host_to_net_u16 (new_l0);
319 ip0->length = new_l0;
320 sum0 = ip0->checksum;
321 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
322 length /* changed member */ );
323 ip0->checksum = ip_csum_fold (sum0);
326 new_l0 = clib_net_to_host_u16 (u0->length);
328 u0->length = clib_host_to_net_u16 (new_l0);
332 vlib_node_increment_counter
333 (vm, dhcp_proxy_to_server_node.index,
334 DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
337 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
340 * If we have multiple servers configured and this is the
341 * client's discover message, then send copies to each of
344 if (is_discover && vec_len (proxy->dhcp_servers) > 1)
348 for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
353 c0 = vlib_buffer_copy (vm, b0);
354 vlib_buffer_copy_trace_flag (vm, c0, bi0);
355 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
356 ci0 = vlib_get_buffer_index (vm, c0);
357 server = &proxy->dhcp_servers[ii];
359 ip0 = vlib_buffer_get_current (c0);
361 sum0 = ip0->checksum;
362 old0 = ip0->dst_address.as_u32;
363 new0 = server->dhcp_server.ip4.as_u32;
364 ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
365 sum0 = ip_csum_update (sum0, old0, new0,
366 ip4_header_t /* structure */ ,
367 dst_address /* changed member */ );
368 ip0->checksum = ip_csum_fold (sum0);
374 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
375 to_next, n_left_to_next,
378 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
380 dhcp_proxy_trace_t *tr;
382 tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
383 tr->which = 0; /* to server */
385 tr->original_sw_if_index = original_sw_if_index;
386 tr->sw_if_index = sw_if_index;
387 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
388 tr->trace_ip4_address.as_u32 =
389 server->dhcp_server.ip4.as_u32;
392 if (PREDICT_FALSE (0 == n_left_to_next))
394 vlib_put_next_frame (vm, node, next_index,
396 vlib_get_next_frame (vm, node, next_index,
397 to_next, n_left_to_next);
402 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
404 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
406 tr->which = 0; /* to server */
408 tr->original_sw_if_index = original_sw_if_index;
409 tr->sw_if_index = sw_if_index;
410 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
411 tr->trace_ip4_address.as_u32 =
412 proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
420 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
421 to_next, n_left_to_next,
425 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
427 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
428 DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
430 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
431 DHCP_PROXY_ERROR_RELAY_TO_SERVER,
433 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
434 DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
435 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
436 DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
437 pkts_no_interface_address);
438 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
439 DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
440 return from_frame->n_vectors;
444 VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
445 .function = dhcp_proxy_to_server_input,
446 .name = "dhcp-proxy-to-server",
447 /* Takes a vector of packets. */
448 .vector_size = sizeof (u32),
450 .n_errors = DHCP_PROXY_N_ERROR,
451 .error_strings = dhcp_proxy_error_strings,
453 .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
455 #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
456 foreach_dhcp_proxy_to_server_input_next
460 .format_buffer = format_dhcp_proxy_header_with_length,
461 .format_trace = format_dhcp_proxy_trace,
463 .unformat_buffer = unformat_dhcp_proxy_header,
469 dhcp_proxy_to_client_input (vlib_main_t * vm,
470 vlib_node_runtime_t * node,
471 vlib_frame_t * from_frame)
473 u32 n_left_from, *from;
474 ethernet_main_t *em = vnet_get_ethernet_main ();
475 dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
476 vnet_main_t *vnm = vnet_get_main ();
477 ip4_main_t *im = &ip4_main;
479 from = vlib_frame_vector_args (from_frame);
480 n_left_from = from_frame->n_vectors;
482 while (n_left_from > 0)
488 ip4_header_t *ip0 = 0;
489 ip4_address_t *ia0 = 0;
492 ethernet_interface_t *ei0;
493 ethernet_header_t *mac0;
494 vnet_hw_interface_t *hi0;
497 u32 sw_if_index = ~0;
498 vnet_sw_interface_t *si0;
499 u32 error0 = (u32) ~ 0;
500 vnet_sw_interface_t *swif;
503 dhcp_server_t *server;
504 u32 original_sw_if_index = (u32) ~ 0;
505 ip4_address_t relay_addr = {
513 b0 = vlib_get_buffer (vm, bi0);
514 h0 = vlib_buffer_get_current (b0);
517 * udp_local hands us the DHCP header, need udp hdr,
518 * ip hdr to relay to client
520 vlib_buffer_advance (b0, -(sizeof (*u0)));
521 u0 = vlib_buffer_get_current (b0);
523 vlib_buffer_advance (b0, -(sizeof (*ip0)));
524 ip0 = vlib_buffer_get_current (b0);
526 /* Consumed by dhcp client code? */
527 if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
530 if (1 /* dpm->insert_option_82 */ )
532 /* linearize needed to "unclone" and scan options */
533 int space_left = vlib_buffer_chain_linearize (vm, b0);
534 if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || space_left < 0)
536 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
540 dhcp_option_t *o = h0->options, *end =
541 (void *) vlib_buffer_get_tail (b0);
543 /* Parse through TLVs looking for option 82.
544 The circuit-ID is the FIB number we need
545 to track down the client-facing interface */
547 while (o->option != DHCP_PACKET_OPTION_END && o < end)
553 dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
554 dhcp_option_t *subend =
555 (dhcp_option_t *) (o->data + o->length);
556 while (sub->option != DHCP_PACKET_OPTION_END
559 /* If this is one of ours, it will have
560 total length 12, circuit-id suboption type,
561 and the sw_if_index */
562 if (sub->option == 1 && sub->length == 4)
564 sw_if_index = ((sub->data[0] << 24) |
565 (sub->data[1] << 16) |
566 (sub->data[2] << 8) |
569 else if (sub->option == 5 && sub->length == 4)
571 relay_addr.as_u8[0] = sub->data[0];
572 relay_addr.as_u8[1] = sub->data[1];
573 relay_addr.as_u8[2] = sub->data[2];
574 relay_addr.as_u8[3] = sub->data[3];
576 else if (sub->option == 151 &&
577 sub->length == 7 && sub->data[0] == 1)
579 else if (sub->option == 152 && sub->length == 0)
581 sub = (dhcp_option_t *) (sub->data + sub->length);
583 if (vss_ctrl && vss_exist)
584 vlib_node_increment_counter
585 (vm, dhcp_proxy_to_client_node.index,
586 DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
589 o = (dhcp_option_t *) (o->data + o->length);
593 if (sw_if_index == (u32) ~ 0)
595 error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
598 vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
600 f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
601 to_next0 = vlib_frame_vector_args (f0);
604 vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
608 if (relay_addr.as_u32 == 0)
610 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
614 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
616 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
620 fib_index = im->fib_index_by_sw_if_index[sw_if_index];
621 proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
623 if (PREDICT_FALSE (NULL == proxy))
625 error0 = DHCP_PROXY_ERROR_NO_SERVER;
629 vec_foreach (server, proxy->dhcp_servers)
631 if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
637 error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
641 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
643 swif = vnet_get_sw_interface (vnm, sw_if_index);
644 original_sw_if_index = sw_if_index;
645 if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
646 sw_if_index = swif->unnumbered_sw_if_index;
648 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
651 error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
655 if (relay_addr.as_u32 != ia0->as_u32)
657 error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
662 u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
663 sum0 = ip0->checksum;
664 old0 = ip0->dst_address.as_u32;
666 ip0->dst_address.as_u32 = new0;
667 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
668 dst_address /* offset of changed member */ );
669 ip0->checksum = ip_csum_fold (sum0);
671 sum0 = ip0->checksum;
672 old0 = ip0->src_address.as_u32;
674 ip0->src_address.as_u32 = new0;
675 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
676 src_address /* offset of changed member */ );
677 ip0->checksum = ip_csum_fold (sum0);
679 vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
680 si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
681 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
682 vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
684 mac0 = vlib_buffer_get_current (b0);
686 hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
687 ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
688 clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
689 clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
690 mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
691 clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);
693 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
695 u32 *vlan_tag = (u32 *) (mac0 + 1);
697 tmp = (si0->sub.id << 16) | 0x0800;
698 *vlan_tag = clib_host_to_net_u32 (tmp);
701 /* $$$ This needs to be rewritten, for sure */
702 f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
703 to_next0 = vlib_frame_vector_args (f0);
706 vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
709 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
711 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
713 tr->which = 1; /* to client */
714 tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
716 tr->original_sw_if_index = original_sw_if_index;
717 tr->sw_if_index = sw_if_index;
721 return from_frame->n_vectors;
725 VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
726 .function = dhcp_proxy_to_client_input,
727 .name = "dhcp-proxy-to-client",
728 /* Takes a vector of packets. */
729 .vector_size = sizeof (u32),
731 .n_errors = DHCP_PROXY_N_ERROR,
732 .error_strings = dhcp_proxy_error_strings,
733 .format_buffer = format_dhcp_proxy_header_with_length,
734 .format_trace = format_dhcp_proxy_trace,
736 .unformat_buffer = unformat_dhcp_proxy_header,
742 dhcp_maybe_register_udp_ports (void)
744 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
745 vlib_main_t *vm = dm->vlib_main;
747 if (dm->udp_ports_registered)
750 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
751 dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );
753 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
754 dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );
756 dm->udp_ports_registered = 1;
759 static clib_error_t *
760 dhcp4_proxy_init (vlib_main_t * vm)
762 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
763 vlib_node_t *error_drop_node;
765 error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
766 dm->error_drop_node_index = error_drop_node->index;
773 VLIB_INIT_FUNCTION (dhcp4_proxy_init);
776 dhcp4_proxy_set_server (ip46_address_t * addr,
777 ip46_address_t * src_addr,
778 u32 rx_table_id, u32 server_table_id, int is_del)
780 u32 rx_fib_index = 0;
783 const fib_prefix_t all_1s = {
785 .fp_addr.ip4.as_u32 = 0xffffffff,
786 .fp_proto = FIB_PROTOCOL_IP4,
789 if (ip46_address_is_zero (addr))
790 return VNET_API_ERROR_INVALID_DST_ADDRESS;
792 if (ip46_address_is_zero (src_addr))
793 return VNET_API_ERROR_INVALID_SRC_ADDRESS;
795 dhcp_maybe_register_udp_ports ();
797 rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
803 if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
804 addr, server_table_id))
806 fib_table_entry_special_remove (rx_fib_index,
807 &all_1s, FIB_SOURCE_DHCP);
808 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
813 if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
815 rx_fib_index, server_table_id))
817 fib_table_entry_special_add (rx_fib_index,
819 FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL);
820 fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
823 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
828 static clib_error_t *
829 dhcp4_proxy_set_command_fn (vlib_main_t * vm,
830 unformat_input_t * input,
831 vlib_cli_command_t * cmd)
833 ip46_address_t server_addr, src_addr;
834 u32 server_table_id = 0, rx_table_id = 0;
836 int set_src = 0, set_server = 0;
838 clib_memset (&server_addr, 0, sizeof (server_addr));
839 clib_memset (&src_addr, 0, sizeof (src_addr));
841 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
843 if (unformat (input, "server %U",
844 unformat_ip4_address, &server_addr.ip4))
846 else if (unformat (input, "server-fib-id %d", &server_table_id))
848 else if (unformat (input, "rx-fib-id %d", &rx_table_id))
850 else if (unformat (input, "src-address %U",
851 unformat_ip4_address, &src_addr.ip4))
853 else if (unformat (input, "delete") || unformat (input, "del"))
859 if (is_del || (set_server && set_src))
863 rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
864 server_table_id, is_del);
870 case VNET_API_ERROR_INVALID_DST_ADDRESS:
871 return clib_error_return (0, "Invalid server address");
873 case VNET_API_ERROR_INVALID_SRC_ADDRESS:
874 return clib_error_return (0, "Invalid src address");
876 case VNET_API_ERROR_NO_SUCH_ENTRY:
877 return clib_error_return
878 (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
881 return clib_error_return (0, "BUG: rv %d", rv);
885 return clib_error_return (0, "parse error`%U'",
886 format_unformat_error, input);
890 VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
891 .path = "set dhcp proxy",
892 .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
893 .function = dhcp4_proxy_set_command_fn,
898 format_dhcp4_proxy_server (u8 * s, va_list * args)
900 dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
901 ip4_fib_t *rx_fib, *server_fib;
902 dhcp_server_t *server;
906 s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
907 "Servers FIB,Address");
911 rx_fib = ip4_fib_get (proxy->rx_fib_index);
913 s = format (s, "%=14u%=16U",
915 format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
917 vec_foreach (server, proxy->dhcp_servers)
919 server_fib = ip4_fib_get (server->server_fib_index);
920 s = format (s, "%u,%U ",
921 server_fib->table_id,
922 format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
928 dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx)
930 vlib_main_t *vm = ctx;
932 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
937 static clib_error_t *
938 dhcp4_proxy_show_command_fn (vlib_main_t * vm,
939 unformat_input_t * input,
940 vlib_cli_command_t * cmd)
942 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server,
943 NULL /* header line */ );
945 dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);
951 VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
952 .path = "show dhcp proxy",
953 .short_help = "Display dhcp proxy server info",
954 .function = dhcp4_proxy_show_command_fn,
958 static clib_error_t *
959 dhcp_option_82_vss_fn (vlib_main_t * vm,
960 unformat_input_t * input, vlib_cli_command_t * cmd)
962 u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
963 u32 oui = 0, fib_id = 0, tbl_id = ~0;
964 u8 *vpn_ascii_id = 0;
966 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
968 if (unformat (input, "table %d", &tbl_id))
970 else if (unformat (input, "oui %d", &oui))
971 vss_type = VSS_TYPE_VPN_ID;
972 else if (unformat (input, "vpn-id %d", &fib_id))
973 vss_type = VSS_TYPE_VPN_ID;
974 else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
975 vss_type = VSS_TYPE_ASCII;
976 else if (unformat (input, "delete") || unformat (input, "del"))
983 return clib_error_return (0, "no table ID specified.");
985 int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
986 vpn_ascii_id, oui, fib_id, is_del);
991 case VNET_API_ERROR_NO_SUCH_ENTRY:
992 return clib_error_return (0,
993 "option 82 vss for table %d not found in in pool.",
996 return clib_error_return (0, "BUG: rv %d", rv);
1002 VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
1003 .path = "set dhcp option-82 vss",
1004 .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1005 .function = dhcp_option_82_vss_fn,
1009 static clib_error_t *
1010 dhcp_vss_show_command_fn (vlib_main_t * vm,
1011 unformat_input_t * input, vlib_cli_command_t * cmd)
1013 dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);
1019 VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
1020 .path = "show dhcp vss",
1021 .short_help = "show dhcp VSS",
1022 .function = dhcp_vss_show_command_fn,
1026 static clib_error_t *
1027 dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
1028 unformat_input_t * input,
1029 vlib_cli_command_t * cmd)
1031 vnet_main_t *vnm = vnet_get_main ();
1032 u32 sw_if_index0 = 0, sw_if_index;
1033 vnet_sw_interface_t *swif;
1036 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1039 if (unformat (input, "%U",
1040 unformat_vnet_sw_interface, vnm, &sw_if_index0))
1042 swif = vnet_get_sw_interface (vnm, sw_if_index0);
1043 sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1044 swif->unnumbered_sw_if_index : sw_if_index0;
1045 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
1048 vlib_cli_output (vm, "%=20s%=20s", "interface",
1049 "source IP address");
1051 vlib_cli_output (vm, "%=20U%=20U",
1052 format_vnet_sw_if_index_name,
1053 vnm, sw_if_index0, format_ip4_address, ia0);
1056 vlib_cli_output (vm, "%=34s %=20U",
1057 "No IPv4 address configured on",
1058 format_vnet_sw_if_index_name, vnm, sw_if_index);
1068 VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
1069 .path = "show dhcp option-82-address interface",
1070 .short_help = "show dhcp option-82-address interface <interface>",
1071 .function = dhcp_option_82_address_show_command_fn,
1076 * fd.io coding-style-patch-verification: ON
1079 * eval: (c-set-style "gnu")