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 ci0 = vlib_get_buffer_index (vm, c0);
355 server = &proxy->dhcp_servers[ii];
357 ip0 = vlib_buffer_get_current (c0);
359 sum0 = ip0->checksum;
360 old0 = ip0->dst_address.as_u32;
361 new0 = server->dhcp_server.ip4.as_u32;
362 ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
363 sum0 = ip_csum_update (sum0, old0, new0,
364 ip4_header_t /* structure */ ,
365 dst_address /* changed member */ );
366 ip0->checksum = ip_csum_fold (sum0);
372 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
373 to_next, n_left_to_next,
376 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
378 dhcp_proxy_trace_t *tr;
380 tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
381 tr->which = 0; /* to server */
383 tr->original_sw_if_index = original_sw_if_index;
384 tr->sw_if_index = sw_if_index;
385 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
386 tr->trace_ip4_address.as_u32 =
387 server->dhcp_server.ip4.as_u32;
390 if (PREDICT_FALSE (0 == n_left_to_next))
392 vlib_put_next_frame (vm, node, next_index,
394 vlib_get_next_frame (vm, node, next_index,
395 to_next, n_left_to_next);
400 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
402 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
404 tr->which = 0; /* to server */
406 tr->original_sw_if_index = original_sw_if_index;
407 tr->sw_if_index = sw_if_index;
408 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
409 tr->trace_ip4_address.as_u32 =
410 proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
418 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
419 to_next, n_left_to_next,
423 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
425 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
426 DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
428 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
429 DHCP_PROXY_ERROR_RELAY_TO_SERVER,
431 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
432 DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
433 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
434 DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
435 pkts_no_interface_address);
436 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
437 DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
438 return from_frame->n_vectors;
442 VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
443 .function = dhcp_proxy_to_server_input,
444 .name = "dhcp-proxy-to-server",
445 /* Takes a vector of packets. */
446 .vector_size = sizeof (u32),
448 .n_errors = DHCP_PROXY_N_ERROR,
449 .error_strings = dhcp_proxy_error_strings,
451 .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
453 #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
454 foreach_dhcp_proxy_to_server_input_next
458 .format_buffer = format_dhcp_proxy_header_with_length,
459 .format_trace = format_dhcp_proxy_trace,
461 .unformat_buffer = unformat_dhcp_proxy_header,
467 dhcp_proxy_to_client_input (vlib_main_t * vm,
468 vlib_node_runtime_t * node,
469 vlib_frame_t * from_frame)
471 u32 n_left_from, *from;
472 ethernet_main_t *em = vnet_get_ethernet_main ();
473 dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
474 vnet_main_t *vnm = vnet_get_main ();
475 ip4_main_t *im = &ip4_main;
477 from = vlib_frame_vector_args (from_frame);
478 n_left_from = from_frame->n_vectors;
480 while (n_left_from > 0)
486 ip4_header_t *ip0 = 0;
487 ip4_address_t *ia0 = 0;
490 ethernet_interface_t *ei0;
491 ethernet_header_t *mac0;
492 vnet_hw_interface_t *hi0;
495 u32 sw_if_index = ~0;
496 vnet_sw_interface_t *si0;
497 u32 error0 = (u32) ~ 0;
498 vnet_sw_interface_t *swif;
501 dhcp_server_t *server;
502 u32 original_sw_if_index = (u32) ~ 0;
503 ip4_address_t relay_addr = {
511 b0 = vlib_get_buffer (vm, bi0);
512 h0 = vlib_buffer_get_current (b0);
515 * udp_local hands us the DHCP header, need udp hdr,
516 * ip hdr to relay to client
518 vlib_buffer_advance (b0, -(sizeof (*u0)));
519 u0 = vlib_buffer_get_current (b0);
521 vlib_buffer_advance (b0, -(sizeof (*ip0)));
522 ip0 = vlib_buffer_get_current (b0);
524 /* Consumed by dhcp client code? */
525 if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
528 if (1 /* dpm->insert_option_82 */ )
530 /* linearize needed to "unclone" and scan options */
531 int space_left = vlib_buffer_chain_linearize (vm, b0);
532 if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || space_left < 0)
534 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
538 dhcp_option_t *o = h0->options, *end =
539 (void *) vlib_buffer_get_tail (b0);
541 /* Parse through TLVs looking for option 82.
542 The circuit-ID is the FIB number we need
543 to track down the client-facing interface */
545 while (o->option != DHCP_PACKET_OPTION_END && o < end)
551 dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
552 dhcp_option_t *subend =
553 (dhcp_option_t *) (o->data + o->length);
554 while (sub->option != DHCP_PACKET_OPTION_END
557 /* If this is one of ours, it will have
558 total length 12, circuit-id suboption type,
559 and the sw_if_index */
560 if (sub->option == 1 && sub->length == 4)
562 sw_if_index = ((sub->data[0] << 24) |
563 (sub->data[1] << 16) |
564 (sub->data[2] << 8) |
567 else if (sub->option == 5 && sub->length == 4)
569 relay_addr.as_u8[0] = sub->data[0];
570 relay_addr.as_u8[1] = sub->data[1];
571 relay_addr.as_u8[2] = sub->data[2];
572 relay_addr.as_u8[3] = sub->data[3];
574 else if (sub->option == 151 &&
575 sub->length == 7 && sub->data[0] == 1)
577 else if (sub->option == 152 && sub->length == 0)
579 sub = (dhcp_option_t *) (sub->data + sub->length);
581 if (vss_ctrl && vss_exist)
582 vlib_node_increment_counter
583 (vm, dhcp_proxy_to_client_node.index,
584 DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
587 o = (dhcp_option_t *) (o->data + o->length);
591 if (sw_if_index == (u32) ~ 0)
593 error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
596 vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
598 f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
599 to_next0 = vlib_frame_vector_args (f0);
602 vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
606 if (relay_addr.as_u32 == 0)
608 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
612 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
614 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
618 fib_index = im->fib_index_by_sw_if_index[sw_if_index];
619 proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
621 if (PREDICT_FALSE (NULL == proxy))
623 error0 = DHCP_PROXY_ERROR_NO_SERVER;
627 vec_foreach (server, proxy->dhcp_servers)
629 if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
635 error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
639 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
641 swif = vnet_get_sw_interface (vnm, sw_if_index);
642 original_sw_if_index = sw_if_index;
643 if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
644 sw_if_index = swif->unnumbered_sw_if_index;
646 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
649 error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
653 if (relay_addr.as_u32 != ia0->as_u32)
655 error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
660 u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
661 sum0 = ip0->checksum;
662 old0 = ip0->dst_address.as_u32;
664 ip0->dst_address.as_u32 = new0;
665 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
666 dst_address /* offset of changed member */ );
667 ip0->checksum = ip_csum_fold (sum0);
669 sum0 = ip0->checksum;
670 old0 = ip0->src_address.as_u32;
672 ip0->src_address.as_u32 = new0;
673 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
674 src_address /* offset of changed member */ );
675 ip0->checksum = ip_csum_fold (sum0);
677 vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
678 si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
679 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
680 vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
682 mac0 = vlib_buffer_get_current (b0);
684 hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
685 ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
686 clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
687 clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
688 mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
689 clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);
691 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
693 u32 *vlan_tag = (u32 *) (mac0 + 1);
695 tmp = (si0->sub.id << 16) | 0x0800;
696 *vlan_tag = clib_host_to_net_u32 (tmp);
699 /* $$$ This needs to be rewritten, for sure */
700 f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
701 to_next0 = vlib_frame_vector_args (f0);
704 vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
707 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
709 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
711 tr->which = 1; /* to client */
712 tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
714 tr->original_sw_if_index = original_sw_if_index;
715 tr->sw_if_index = sw_if_index;
719 return from_frame->n_vectors;
723 VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
724 .function = dhcp_proxy_to_client_input,
725 .name = "dhcp-proxy-to-client",
726 /* Takes a vector of packets. */
727 .vector_size = sizeof (u32),
729 .n_errors = DHCP_PROXY_N_ERROR,
730 .error_strings = dhcp_proxy_error_strings,
731 .format_buffer = format_dhcp_proxy_header_with_length,
732 .format_trace = format_dhcp_proxy_trace,
734 .unformat_buffer = unformat_dhcp_proxy_header,
740 dhcp_maybe_register_udp_ports (void)
742 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
743 vlib_main_t *vm = dm->vlib_main;
745 if (dm->udp_ports_registered)
748 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
749 dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );
751 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
752 dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );
754 dm->udp_ports_registered = 1;
757 static clib_error_t *
758 dhcp4_proxy_init (vlib_main_t * vm)
760 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
761 vlib_node_t *error_drop_node;
763 error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
764 dm->error_drop_node_index = error_drop_node->index;
771 VLIB_INIT_FUNCTION (dhcp4_proxy_init);
774 dhcp4_proxy_set_server (ip46_address_t * addr,
775 ip46_address_t * src_addr,
776 u32 rx_table_id, u32 server_table_id, int is_del)
778 u32 rx_fib_index = 0;
781 const fib_prefix_t all_1s = {
783 .fp_addr.ip4.as_u32 = 0xffffffff,
784 .fp_proto = FIB_PROTOCOL_IP4,
787 if (ip46_address_is_zero (addr))
788 return VNET_API_ERROR_INVALID_DST_ADDRESS;
790 if (ip46_address_is_zero (src_addr))
791 return VNET_API_ERROR_INVALID_SRC_ADDRESS;
793 dhcp_maybe_register_udp_ports ();
795 rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
801 if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
802 addr, server_table_id))
804 fib_table_entry_special_remove (rx_fib_index,
805 &all_1s, FIB_SOURCE_DHCP);
806 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
811 if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
813 rx_fib_index, server_table_id))
815 fib_table_entry_special_add (rx_fib_index,
817 FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL);
818 fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
821 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
826 static clib_error_t *
827 dhcp4_proxy_set_command_fn (vlib_main_t * vm,
828 unformat_input_t * input,
829 vlib_cli_command_t * cmd)
831 ip46_address_t server_addr, src_addr;
832 u32 server_table_id = 0, rx_table_id = 0;
834 int set_src = 0, set_server = 0;
836 clib_memset (&server_addr, 0, sizeof (server_addr));
837 clib_memset (&src_addr, 0, sizeof (src_addr));
839 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
841 if (unformat (input, "server %U",
842 unformat_ip4_address, &server_addr.ip4))
844 else if (unformat (input, "server-fib-id %d", &server_table_id))
846 else if (unformat (input, "rx-fib-id %d", &rx_table_id))
848 else if (unformat (input, "src-address %U",
849 unformat_ip4_address, &src_addr.ip4))
851 else if (unformat (input, "delete") || unformat (input, "del"))
857 if (is_del || (set_server && set_src))
861 rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
862 server_table_id, is_del);
868 case VNET_API_ERROR_INVALID_DST_ADDRESS:
869 return clib_error_return (0, "Invalid server address");
871 case VNET_API_ERROR_INVALID_SRC_ADDRESS:
872 return clib_error_return (0, "Invalid src address");
874 case VNET_API_ERROR_NO_SUCH_ENTRY:
875 return clib_error_return
876 (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
879 return clib_error_return (0, "BUG: rv %d", rv);
883 return clib_error_return (0, "parse error`%U'",
884 format_unformat_error, input);
888 VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
889 .path = "set dhcp proxy",
890 .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
891 .function = dhcp4_proxy_set_command_fn,
896 format_dhcp4_proxy_server (u8 * s, va_list * args)
898 dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
899 ip4_fib_t *rx_fib, *server_fib;
900 dhcp_server_t *server;
904 s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
905 "Servers FIB,Address");
909 rx_fib = ip4_fib_get (proxy->rx_fib_index);
911 s = format (s, "%=14u%=16U",
913 format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
915 vec_foreach (server, proxy->dhcp_servers)
917 server_fib = ip4_fib_get (server->server_fib_index);
918 s = format (s, "%u,%U ",
919 server_fib->table_id,
920 format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
926 dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx)
928 vlib_main_t *vm = ctx;
930 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
935 static clib_error_t *
936 dhcp4_proxy_show_command_fn (vlib_main_t * vm,
937 unformat_input_t * input,
938 vlib_cli_command_t * cmd)
940 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server,
941 NULL /* header line */ );
943 dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);
949 VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
950 .path = "show dhcp proxy",
951 .short_help = "Display dhcp proxy server info",
952 .function = dhcp4_proxy_show_command_fn,
956 static clib_error_t *
957 dhcp_option_82_vss_fn (vlib_main_t * vm,
958 unformat_input_t * input, vlib_cli_command_t * cmd)
960 u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
961 u32 oui = 0, fib_id = 0, tbl_id = ~0;
962 u8 *vpn_ascii_id = 0;
964 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
966 if (unformat (input, "table %d", &tbl_id))
968 else if (unformat (input, "oui %d", &oui))
969 vss_type = VSS_TYPE_VPN_ID;
970 else if (unformat (input, "vpn-id %d", &fib_id))
971 vss_type = VSS_TYPE_VPN_ID;
972 else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
973 vss_type = VSS_TYPE_ASCII;
974 else if (unformat (input, "delete") || unformat (input, "del"))
981 return clib_error_return (0, "no table ID specified.");
983 int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
984 vpn_ascii_id, oui, fib_id, is_del);
989 case VNET_API_ERROR_NO_SUCH_ENTRY:
990 return clib_error_return (0,
991 "option 82 vss for table %d not found in in pool.",
994 return clib_error_return (0, "BUG: rv %d", rv);
1000 VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
1001 .path = "set dhcp option-82 vss",
1002 .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1003 .function = dhcp_option_82_vss_fn,
1007 static clib_error_t *
1008 dhcp_vss_show_command_fn (vlib_main_t * vm,
1009 unformat_input_t * input, vlib_cli_command_t * cmd)
1011 dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);
1017 VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
1018 .path = "show dhcp vss",
1019 .short_help = "show dhcp VSS",
1020 .function = dhcp_vss_show_command_fn,
1024 static clib_error_t *
1025 dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
1026 unformat_input_t * input,
1027 vlib_cli_command_t * cmd)
1029 vnet_main_t *vnm = vnet_get_main ();
1030 u32 sw_if_index0 = 0, sw_if_index;
1031 vnet_sw_interface_t *swif;
1034 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1037 if (unformat (input, "%U",
1038 unformat_vnet_sw_interface, vnm, &sw_if_index0))
1040 swif = vnet_get_sw_interface (vnm, sw_if_index0);
1041 sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1042 swif->unnumbered_sw_if_index : sw_if_index0;
1043 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
1046 vlib_cli_output (vm, "%=20s%=20s", "interface",
1047 "source IP address");
1049 vlib_cli_output (vm, "%=20U%=20U",
1050 format_vnet_sw_if_index_name,
1051 vnm, sw_if_index0, format_ip4_address, ia0);
1054 vlib_cli_output (vm, "%=34s %=20U",
1055 "No IPv4 address configured on",
1056 format_vnet_sw_if_index_name, vnm, sw_if_index);
1066 VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
1067 .path = "show dhcp option-82-address interface",
1068 .short_help = "show dhcp option-82-address interface <interface>",
1069 .function = dhcp_option_82_address_show_command_fn,
1074 * fd.io coding-style-patch-verification: ON
1077 * eval: (c-set-style "gnu")