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 if (!vlib_buffer_chain_linearize (vm, b0))
186 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
187 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
191 space_left = vlib_buffer_space_left_at_end (vm, b0);
192 /* cant parse chains...
193 * and we need some space for option 82*/
194 if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 ||
195 space_left < VPP_DHCP_OPTION82_SIZE)
197 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
198 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
203 server = &proxy->dhcp_servers[0];
204 vlib_buffer_advance (b0, -(sizeof (*ip0)));
205 ip0 = vlib_buffer_get_current (b0);
207 /* disable UDP checksum */
209 sum0 = ip0->checksum;
210 old0 = ip0->dst_address.as_u32;
211 new0 = server->dhcp_server.ip4.as_u32;
212 ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
213 sum0 = ip_csum_update (sum0, old0, new0,
214 ip4_header_t /* structure */ ,
215 dst_address /* changed member */ );
216 ip0->checksum = ip_csum_fold (sum0);
218 sum0 = ip0->checksum;
219 old0 = ip0->src_address.as_u32;
220 new0 = proxy->dhcp_src_address.ip4.as_u32;
221 ip0->src_address.as_u32 = new0;
222 sum0 = ip_csum_update (sum0, old0, new0,
223 ip4_header_t /* structure */ ,
224 src_address /* changed member */ );
225 ip0->checksum = ip_csum_fold (sum0);
227 /* Send to DHCP server via the configured FIB */
228 vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index;
230 h0->gateway_ip_address = proxy->dhcp_src_address.ip4;
234 end = (void *) vlib_buffer_get_tail (b0);
236 /* TLVs are not performance-friendly... */
237 while (o->option != DHCP_PACKET_OPTION_END && o < end)
239 if (DHCP_PACKET_OPTION_MSG_TYPE == o->option)
241 if (DHCP_PACKET_DISCOVER == o->data[0])
246 o = (dhcp_option_t *) (o->data + o->length);
249 if (o->option == DHCP_PACKET_OPTION_END && o <= end)
251 vnet_main_t *vnm = vnet_get_main ();
253 ip4_address_t _ia0, *ia0 = &_ia0;
255 vnet_sw_interface_t *swif;
257 original_sw_if_index = sw_if_index =
258 vnet_buffer (b0)->sw_if_index[VLIB_RX];
259 swif = vnet_get_sw_interface (vnm, sw_if_index);
260 if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
261 sw_if_index = swif->unnumbered_sw_if_index;
264 * Get the first ip4 address on the [client-side]
265 * RX interface, if not unnumbered. otherwise use
266 * the loopback interface's ip address.
268 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
272 error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
273 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
274 pkts_no_interface_address++;
279 o->option = 82; /* option 82 */
280 o->length = 12; /* 12 octets to follow */
281 o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */
282 o->data[1] = 4; /* length of suboption */
283 u32 *o_ifid = (u32 *) & o->data[2];
284 *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
285 o->data[6] = 5; /* suboption 5 (client RX intfc address) */
286 o->data[7] = 4; /* length 4 */
287 u32 *o_addr = (u32 *) & o->data[8];
288 *o_addr = ia0->as_u32;
289 o->data[12] = DHCP_PACKET_OPTION_END;
291 vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
294 u32 id_len; /* length of VPN ID */
296 if (vss->vss_type == VSS_TYPE_VPN_ID)
298 id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */
299 memcpy (&o->data[15], vss->vpn_id, id_len);
301 else if (vss->vss_type == VSS_TYPE_ASCII)
303 id_len = vec_len (vss->vpn_ascii_id);
304 memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
306 else /* must be VSS_TYPE_DEFAULT, no VPN ID */
309 o->data[12] = 151; /* vss suboption */
310 o->data[13] = id_len + 1; /* length: vss_type + id_len */
311 o->data[14] = vss->vss_type; /* vss option type */
312 o->data[15 + id_len] = 152; /* vss control suboption */
313 o->data[16 + id_len] = 0; /* length */
314 o->data[17 + id_len] = DHCP_PACKET_OPTION_END; /* "end-of-options" (0xFF) */
315 /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
316 o->length += id_len + 5;
320 b0->current_length += len;
321 /* Fix IP header length and checksum */
322 old_l0 = ip0->length;
323 new_l0 = clib_net_to_host_u16 (old_l0);
325 new_l0 = clib_host_to_net_u16 (new_l0);
326 ip0->length = new_l0;
327 sum0 = ip0->checksum;
328 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
329 length /* changed member */ );
330 ip0->checksum = ip_csum_fold (sum0);
333 new_l0 = clib_net_to_host_u16 (u0->length);
335 u0->length = clib_host_to_net_u16 (new_l0);
339 vlib_node_increment_counter
340 (vm, dhcp_proxy_to_server_node.index,
341 DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
344 next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
347 * If we have multiple servers configured and this is the
348 * client's discover message, then send copies to each of
351 if (is_discover && vec_len (proxy->dhcp_servers) > 1)
355 for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
360 c0 = vlib_buffer_copy (vm, b0);
361 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
362 ci0 = vlib_get_buffer_index (vm, c0);
363 server = &proxy->dhcp_servers[ii];
365 ip0 = vlib_buffer_get_current (c0);
367 sum0 = ip0->checksum;
368 old0 = ip0->dst_address.as_u32;
369 new0 = server->dhcp_server.ip4.as_u32;
370 ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
371 sum0 = ip_csum_update (sum0, old0, new0,
372 ip4_header_t /* structure */ ,
373 dst_address /* changed member */ );
374 ip0->checksum = ip_csum_fold (sum0);
380 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
381 to_next, n_left_to_next,
384 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
386 dhcp_proxy_trace_t *tr;
388 tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
389 tr->which = 0; /* to server */
391 tr->original_sw_if_index = original_sw_if_index;
392 tr->sw_if_index = sw_if_index;
393 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
394 tr->trace_ip4_address.as_u32 =
395 server->dhcp_server.ip4.as_u32;
398 if (PREDICT_FALSE (0 == n_left_to_next))
400 vlib_put_next_frame (vm, node, next_index,
402 vlib_get_next_frame (vm, node, next_index,
403 to_next, n_left_to_next);
408 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
410 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
412 tr->which = 0; /* to server */
414 tr->original_sw_if_index = original_sw_if_index;
415 tr->sw_if_index = sw_if_index;
416 if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
417 tr->trace_ip4_address.as_u32 =
418 proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
426 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
427 to_next, n_left_to_next,
431 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
433 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
434 DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
436 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
437 DHCP_PROXY_ERROR_RELAY_TO_SERVER,
439 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
440 DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
441 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
442 DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
443 pkts_no_interface_address);
444 vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
445 DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
446 return from_frame->n_vectors;
450 VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
451 .function = dhcp_proxy_to_server_input,
452 .name = "dhcp-proxy-to-server",
453 /* Takes a vector of packets. */
454 .vector_size = sizeof (u32),
456 .n_errors = DHCP_PROXY_N_ERROR,
457 .error_strings = dhcp_proxy_error_strings,
459 .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
461 #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
462 foreach_dhcp_proxy_to_server_input_next
466 .format_buffer = format_dhcp_proxy_header_with_length,
467 .format_trace = format_dhcp_proxy_trace,
469 .unformat_buffer = unformat_dhcp_proxy_header,
475 dhcp_proxy_to_client_input (vlib_main_t * vm,
476 vlib_node_runtime_t * node,
477 vlib_frame_t * from_frame)
479 u32 n_left_from, *from;
480 ethernet_main_t *em = vnet_get_ethernet_main ();
481 dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
482 vnet_main_t *vnm = vnet_get_main ();
483 ip4_main_t *im = &ip4_main;
485 from = vlib_frame_vector_args (from_frame);
486 n_left_from = from_frame->n_vectors;
488 while (n_left_from > 0)
494 ip4_header_t *ip0 = 0;
495 ip4_address_t *ia0 = 0;
498 ethernet_interface_t *ei0;
499 ethernet_header_t *mac0;
500 vnet_hw_interface_t *hi0;
503 u32 sw_if_index = ~0;
504 vnet_sw_interface_t *si0;
505 u32 error0 = (u32) ~ 0;
506 vnet_sw_interface_t *swif;
509 dhcp_server_t *server;
510 u32 original_sw_if_index = (u32) ~ 0;
511 ip4_address_t relay_addr = {
519 b0 = vlib_get_buffer (vm, bi0);
520 h0 = vlib_buffer_get_current (b0);
523 * udp_local hands us the DHCP header, need udp hdr,
524 * ip hdr to relay to client
526 vlib_buffer_advance (b0, -(sizeof (*u0)));
527 u0 = vlib_buffer_get_current (b0);
529 vlib_buffer_advance (b0, -(sizeof (*ip0)));
530 ip0 = vlib_buffer_get_current (b0);
532 /* Consumed by dhcp client code? */
533 if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
536 if (1 /* dpm->insert_option_82 */ )
538 /* linearize needed to "unclone" and scan options */
539 int rv = vlib_buffer_chain_linearize (vm, b0);
540 if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || !rv)
542 error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
546 dhcp_option_t *o = h0->options, *end =
547 (void *) vlib_buffer_get_tail (b0);
549 /* Parse through TLVs looking for option 82.
550 The circuit-ID is the FIB number we need
551 to track down the client-facing interface */
553 while (o->option != DHCP_PACKET_OPTION_END && o < end)
559 dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
560 dhcp_option_t *subend =
561 (dhcp_option_t *) (o->data + o->length);
562 while (sub->option != DHCP_PACKET_OPTION_END
565 /* If this is one of ours, it will have
566 total length 12, circuit-id suboption type,
567 and the sw_if_index */
568 if (sub->option == 1 && sub->length == 4)
570 sw_if_index = ((sub->data[0] << 24) |
571 (sub->data[1] << 16) |
572 (sub->data[2] << 8) |
575 else if (sub->option == 5 && sub->length == 4)
577 relay_addr.as_u8[0] = sub->data[0];
578 relay_addr.as_u8[1] = sub->data[1];
579 relay_addr.as_u8[2] = sub->data[2];
580 relay_addr.as_u8[3] = sub->data[3];
582 else if (sub->option == 151 &&
583 sub->length == 7 && sub->data[0] == 1)
585 else if (sub->option == 152 && sub->length == 0)
587 sub = (dhcp_option_t *) (sub->data + sub->length);
589 if (vss_ctrl && vss_exist)
590 vlib_node_increment_counter
591 (vm, dhcp_proxy_to_client_node.index,
592 DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
595 o = (dhcp_option_t *) (o->data + o->length);
599 if (sw_if_index == (u32) ~ 0)
601 error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
604 vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
606 f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
607 to_next0 = vlib_frame_vector_args (f0);
610 vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
614 if (relay_addr.as_u32 == 0)
616 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
620 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
622 error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
626 fib_index = im->fib_index_by_sw_if_index[sw_if_index];
627 proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
629 if (PREDICT_FALSE (NULL == proxy))
631 error0 = DHCP_PROXY_ERROR_NO_SERVER;
635 vec_foreach (server, proxy->dhcp_servers)
637 if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
643 error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
647 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
649 swif = vnet_get_sw_interface (vnm, sw_if_index);
650 original_sw_if_index = sw_if_index;
651 if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
652 sw_if_index = swif->unnumbered_sw_if_index;
654 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
657 error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
661 if (relay_addr.as_u32 != ia0->as_u32)
663 error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
668 u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
669 sum0 = ip0->checksum;
670 old0 = ip0->dst_address.as_u32;
672 ip0->dst_address.as_u32 = new0;
673 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
674 dst_address /* offset of changed member */ );
675 ip0->checksum = ip_csum_fold (sum0);
677 sum0 = ip0->checksum;
678 old0 = ip0->src_address.as_u32;
680 ip0->src_address.as_u32 = new0;
681 sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
682 src_address /* offset of changed member */ );
683 ip0->checksum = ip_csum_fold (sum0);
685 vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
686 si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
687 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
688 vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
690 mac0 = vlib_buffer_get_current (b0);
692 hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
693 ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
694 clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
695 clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
696 mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
697 clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);
699 if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
701 u32 *vlan_tag = (u32 *) (mac0 + 1);
703 tmp = (si0->sub.id << 16) | 0x0800;
704 *vlan_tag = clib_host_to_net_u32 (tmp);
707 /* $$$ This needs to be rewritten, for sure */
708 f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
709 to_next0 = vlib_frame_vector_args (f0);
712 vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
715 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
717 dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
719 tr->which = 1; /* to client */
720 tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
722 tr->original_sw_if_index = original_sw_if_index;
723 tr->sw_if_index = sw_if_index;
727 return from_frame->n_vectors;
731 VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
732 .function = dhcp_proxy_to_client_input,
733 .name = "dhcp-proxy-to-client",
734 /* Takes a vector of packets. */
735 .vector_size = sizeof (u32),
737 .n_errors = DHCP_PROXY_N_ERROR,
738 .error_strings = dhcp_proxy_error_strings,
739 .format_buffer = format_dhcp_proxy_header_with_length,
740 .format_trace = format_dhcp_proxy_trace,
742 .unformat_buffer = unformat_dhcp_proxy_header,
748 dhcp_maybe_register_udp_ports (dhcp_port_reg_flags_t ports)
750 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
751 vlib_main_t *vm = dm->vlib_main;
752 int port_regs_diff = dm->udp_ports_registered ^ ports;
757 if ((port_regs_diff & DHCP_PORT_REG_CLIENT) & ports)
758 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
759 dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );
761 if ((port_regs_diff & DHCP_PORT_REG_SERVER) & ports)
762 udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
763 dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );
765 dm->udp_ports_registered |= ports;
768 static clib_error_t *
769 dhcp4_proxy_init (vlib_main_t * vm)
771 dhcp_proxy_main_t *dm = &dhcp_proxy_main;
772 vlib_node_t *error_drop_node;
774 error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
775 dm->error_drop_node_index = error_drop_node->index;
782 VLIB_INIT_FUNCTION (dhcp4_proxy_init);
785 dhcp4_proxy_set_server (ip46_address_t * addr,
786 ip46_address_t * src_addr,
787 u32 rx_table_id, u32 server_table_id, int is_del)
789 u32 rx_fib_index = 0;
792 const fib_prefix_t all_1s = {
794 .fp_addr.ip4.as_u32 = 0xffffffff,
795 .fp_proto = FIB_PROTOCOL_IP4,
798 if (ip46_address_is_zero (addr))
799 return VNET_API_ERROR_INVALID_DST_ADDRESS;
801 if (ip46_address_is_zero (src_addr))
802 return VNET_API_ERROR_INVALID_SRC_ADDRESS;
804 dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT | DHCP_PORT_REG_SERVER);
806 rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
812 if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
813 addr, server_table_id))
815 fib_table_entry_special_remove (rx_fib_index,
816 &all_1s, FIB_SOURCE_DHCP);
817 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
822 if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
824 rx_fib_index, server_table_id))
826 fib_table_entry_special_add (rx_fib_index,
828 FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL);
829 fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
832 fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
837 static clib_error_t *
838 dhcp4_proxy_set_command_fn (vlib_main_t * vm,
839 unformat_input_t * input,
840 vlib_cli_command_t * cmd)
842 ip46_address_t server_addr, src_addr;
843 u32 server_table_id = 0, rx_table_id = 0;
845 int set_src = 0, set_server = 0;
847 clib_memset (&server_addr, 0, sizeof (server_addr));
848 clib_memset (&src_addr, 0, sizeof (src_addr));
850 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
852 if (unformat (input, "server %U",
853 unformat_ip4_address, &server_addr.ip4))
855 else if (unformat (input, "server-fib-id %d", &server_table_id))
857 else if (unformat (input, "rx-fib-id %d", &rx_table_id))
859 else if (unformat (input, "src-address %U",
860 unformat_ip4_address, &src_addr.ip4))
862 else if (unformat (input, "delete") || unformat (input, "del"))
868 if (is_del || (set_server && set_src))
872 rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
873 server_table_id, is_del);
879 case VNET_API_ERROR_INVALID_DST_ADDRESS:
880 return clib_error_return (0, "Invalid server address");
882 case VNET_API_ERROR_INVALID_SRC_ADDRESS:
883 return clib_error_return (0, "Invalid src address");
885 case VNET_API_ERROR_NO_SUCH_ENTRY:
886 return clib_error_return
887 (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
890 return clib_error_return (0, "BUG: rv %d", rv);
894 return clib_error_return (0, "parse error`%U'",
895 format_unformat_error, input);
899 VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
900 .path = "set dhcp proxy",
901 .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
902 .function = dhcp4_proxy_set_command_fn,
907 format_dhcp4_proxy_server (u8 * s, va_list * args)
909 dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
910 ip4_fib_t *rx_fib, *server_fib;
911 dhcp_server_t *server;
915 s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
916 "Servers FIB,Address");
920 rx_fib = ip4_fib_get (proxy->rx_fib_index);
922 s = format (s, "%=14u%=16U",
924 format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
926 vec_foreach (server, proxy->dhcp_servers)
928 server_fib = ip4_fib_get (server->server_fib_index);
929 s = format (s, "%u,%U ",
930 server_fib->table_id,
931 format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
937 dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx)
939 vlib_main_t *vm = ctx;
941 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
946 static clib_error_t *
947 dhcp4_proxy_show_command_fn (vlib_main_t * vm,
948 unformat_input_t * input,
949 vlib_cli_command_t * cmd)
951 vlib_cli_output (vm, "%U", format_dhcp4_proxy_server,
952 NULL /* header line */ );
954 dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);
960 VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
961 .path = "show dhcp proxy",
962 .short_help = "Display dhcp proxy server info",
963 .function = dhcp4_proxy_show_command_fn,
967 static clib_error_t *
968 dhcp_option_82_vss_fn (vlib_main_t * vm,
969 unformat_input_t * input, vlib_cli_command_t * cmd)
971 u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
972 u32 oui = 0, fib_id = 0, tbl_id = ~0;
973 u8 *vpn_ascii_id = 0;
975 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
977 if (unformat (input, "table %d", &tbl_id))
979 else if (unformat (input, "oui %d", &oui))
980 vss_type = VSS_TYPE_VPN_ID;
981 else if (unformat (input, "vpn-id %d", &fib_id))
982 vss_type = VSS_TYPE_VPN_ID;
983 else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
984 vss_type = VSS_TYPE_ASCII;
985 else if (unformat (input, "delete") || unformat (input, "del"))
992 return clib_error_return (0, "no table ID specified.");
994 int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
995 vpn_ascii_id, oui, fib_id, is_del);
1000 case VNET_API_ERROR_NO_SUCH_ENTRY:
1001 return clib_error_return (0,
1002 "option 82 vss for table %d not found in in pool.",
1005 return clib_error_return (0, "BUG: rv %d", rv);
1011 VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
1012 .path = "set dhcp option-82 vss",
1013 .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1014 .function = dhcp_option_82_vss_fn,
1018 static clib_error_t *
1019 dhcp_vss_show_command_fn (vlib_main_t * vm,
1020 unformat_input_t * input, vlib_cli_command_t * cmd)
1022 dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);
1028 VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
1029 .path = "show dhcp vss",
1030 .short_help = "show dhcp VSS",
1031 .function = dhcp_vss_show_command_fn,
1035 static clib_error_t *
1036 dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
1037 unformat_input_t * input,
1038 vlib_cli_command_t * cmd)
1040 vnet_main_t *vnm = vnet_get_main ();
1041 u32 sw_if_index0 = 0, sw_if_index;
1042 vnet_sw_interface_t *swif;
1045 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1048 if (unformat (input, "%U",
1049 unformat_vnet_sw_interface, vnm, &sw_if_index0))
1051 swif = vnet_get_sw_interface (vnm, sw_if_index0);
1052 sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1053 swif->unnumbered_sw_if_index : sw_if_index0;
1054 ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
1057 vlib_cli_output (vm, "%=20s%=20s", "interface",
1058 "source IP address");
1060 vlib_cli_output (vm, "%=20U%=20U",
1061 format_vnet_sw_if_index_name,
1062 vnm, sw_if_index0, format_ip4_address, ia0);
1065 vlib_cli_output (vm, "%=34s %=20U",
1066 "No IPv4 address configured on",
1067 format_vnet_sw_if_index_name, vnm, sw_if_index);
1077 VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
1078 .path = "show dhcp option-82-address interface",
1079 .short_help = "show dhcp option-82-address interface <interface>",
1080 .function = dhcp_option_82_address_show_command_fn,
1085 * fd.io coding-style-patch-verification: ON
1088 * eval: (c-set-style "gnu")