src/vnet/dhcp/dhcp4_proxy_node.c

   1 /*
   2  * proxy_node.c: dhcp proxy node processing
   3  *
   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:
   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 <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>
  23
  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
  28 };
  29
  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")
  34
  35 typedef enum {
  36 #define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
  37   foreach_dhcp_proxy_to_server_input_next
  38 #undef _
  39   DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
  40 } dhcp_proxy_to_server_input_next_t;
  41
  42 typedef struct {
  43   /* 0 => to server, 1 => to client */
  44   int which;
  45   ip4_address_t trace_ip4_address;
  46   u32 error;
  47   u32 sw_if_index;
  48   u32 original_sw_if_index;
  49 } dhcp_proxy_trace_t;
  50
  51 #define VPP_DHCP_OPTION82_SUB1_SIZE   6
  52 #define VPP_DHCP_OPTION82_SUB5_SIZE   6
  53 #define VPP_DHCP_OPTION82_VSS_SIZE    12
  54 #define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
  55                                 VPP_DHCP_OPTION82_SUB5_SIZE + \
  56                                 VPP_DHCP_OPTION82_VSS_SIZE +3)
  57
  58 static vlib_node_registration_t dhcp_proxy_to_server_node;
  59 static vlib_node_registration_t dhcp_proxy_to_client_node;
  60
  61 static u8 *
  62 format_dhcp_proxy_trace (u8 * s, va_list * args)
  63 {
  64   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  65   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  66   dhcp_proxy_trace_t * t = va_arg (*args, dhcp_proxy_trace_t *);
  67
  68   if (t->which == 0)
  69     s = format (s, "DHCP proxy: sent to server %U\n",
  70                 format_ip4_address, &t->trace_ip4_address, t->error);
  71   else
  72     s = format (s, "DHCP proxy: broadcast to client from %U\n",
  73                 format_ip4_address, &t->trace_ip4_address);
  74
  75   if (t->error != (u32)~0)
  76     s = format (s, "  error: %s\n", dhcp_proxy_error_strings[t->error]);
  77
  78   s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
  79               t->original_sw_if_index, t->sw_if_index);
  80
  81   return s;
  82 }
  83
  84 static u8 *
  85 format_dhcp_proxy_header_with_length (u8 * s, va_list * args)
  86 {
  87   dhcp_header_t * h = va_arg (*args, dhcp_header_t *);
  88   u32 max_header_bytes = va_arg (*args, u32);
  89   u32 header_bytes;
  90
  91   header_bytes = sizeof (h[0]);
  92   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
  93     return format (s, "dhcp header truncated");
  94
  95   s = format (s, "DHCP Proxy");
  96
  97   return s;
  98 }
  99
 100 static uword
 101 dhcp_proxy_to_server_input (vlib_main_t * vm,
 102                             vlib_node_runtime_t * node,
 103                             vlib_frame_t * from_frame)
 104 {
 105   u32 n_left_from, next_index, * from, * to_next;
 106   dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
 107   from = vlib_frame_vector_args (from_frame);
 108   n_left_from = from_frame->n_vectors;
 109   u32 pkts_to_server=0, pkts_to_client=0, pkts_no_server=0;
 110   u32 pkts_no_interface_address=0;
 111   u32 pkts_too_big=0;
 112   ip4_main_t * im = &ip4_main;
 113
 114   next_index = node->cached_next_index;
 115
 116   while (n_left_from > 0)
 117     {
 118       u32 n_left_to_next;
 119
 120       vlib_get_next_frame (vm, node, next_index,
 121                            to_next, n_left_to_next);
 122
 123       while (n_left_from > 0 && n_left_to_next > 0)
 124         {
 125           u32 bi0;
 126           vlib_buffer_t * b0;
 127           udp_header_t * u0;
 128           dhcp_header_t * h0;
 129           ip4_header_t * ip0;
 130           u32 next0;
 131           u32 old0, new0;
 132           ip_csum_t sum0;
 133           u32 error0 = (u32) ~0;
 134           u32 sw_if_index = 0;
 135           u32 original_sw_if_index = 0;
 136           u8  *end = NULL;
 137           u32 fib_index;
 138           dhcp_proxy_t *proxy;
 139           dhcp_server_t *server;
 140           u32 rx_sw_if_index;
 141           dhcp_option_t *o;
 142           u32 len = 0;
 143           vlib_buffer_free_list_t *fl;
 144           u8 is_discover = 0;
 145
 146           bi0 = from[0];
 147           from += 1;
 148           n_left_from -= 1;
 149
 150           b0 = vlib_get_buffer (vm, bi0);
 151
 152           h0 = vlib_buffer_get_current (b0);
 153
 154           /*
 155            * udp_local hands us the DHCP header, need udp hdr,
 156            * ip hdr to relay to server
 157            */
 158           vlib_buffer_advance (b0, -(sizeof(*u0)));
 159           u0 = vlib_buffer_get_current (b0);
 160
 161           /* This blows. Return traffic has src_port = 67, dst_port = 67 */
 162           if (u0->src_port == clib_net_to_host_u16(UDP_DST_PORT_dhcp_to_server))
 163             {
 164               vlib_buffer_advance (b0, sizeof(*u0));
 165               next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 166               error0 = 0;
 167               pkts_to_client++;
 168               goto do_enqueue;
 169             }
 170
 171           rx_sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 172
 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);
 175
 176           if (PREDICT_FALSE (NULL == proxy))
 177             {
 178               error0 = DHCP_PROXY_ERROR_NO_SERVER;
 179               next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 180               pkts_no_server++;
 181               goto do_trace;
 182             }
 183
 184           server = &proxy->dhcp_servers[0];
 185           vlib_buffer_advance (b0, -(sizeof(*ip0)));
 186           ip0 = vlib_buffer_get_current (b0);
 187
 188           /* disable UDP checksum */
 189           u0->checksum = 0;
 190           sum0 = ip0->checksum;
 191           old0 = ip0->dst_address.as_u32;
 192           new0 = server->dhcp_server.ip4.as_u32;
 193           ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
 194           sum0 = ip_csum_update (sum0, old0, new0,
 195                                 ip4_header_t /* structure */,
 196                                 dst_address /* changed member */);
 197           ip0->checksum = ip_csum_fold (sum0);
 198
 199           sum0 = ip0->checksum;
 200           old0 = ip0->src_address.as_u32;
 201           new0 = proxy->dhcp_src_address.ip4.as_u32;
 202           ip0->src_address.as_u32 = new0;
 203           sum0 = ip_csum_update (sum0, old0, new0,
 204                                 ip4_header_t /* structure */,
 205                                 src_address /* changed member */);
 206           ip0->checksum = ip_csum_fold (sum0);
 207
 208           /* Send to DHCP server via the configured FIB */
 209           vnet_buffer(b0)->sw_if_index[VLIB_TX] =
 210             server->server_fib_index;
 211
 212           h0->gateway_ip_address.as_u32 = proxy->dhcp_src_address.ip4.as_u32;
 213           pkts_to_server++;
 214
 215           o = (dhcp_option_t *) h0->options;
 216
 217           fib_index = im->fib_index_by_sw_if_index
 218               [vnet_buffer(b0)->sw_if_index[VLIB_RX]];
 219
 220           end = b0->data + b0->current_data + b0->current_length;
 221           /* TLVs are not performance-friendly... */
 222           while  (o->option != 0xFF /* end of options */ && (u8 *)o < end)
 223             {
 224               if (DHCP_PACKET_OPTION_MSG_TYPE == o->option)
 225                 {
 226                   if (DHCP_PACKET_DISCOVER == o->data[0])
 227                     {
 228                       is_discover = 1;
 229                     }
 230                 }
 231               o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
 232             }
 233
 234           fl = vlib_buffer_get_free_list (vm, vlib_buffer_get_free_list_index (b0));
 235           // start write at (option*)o, some packets have padding
 236           if (((u8 *)o - (u8 *)b0->data + VPP_DHCP_OPTION82_SIZE) > fl->n_data_bytes)
 237             {
 238               next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 239               pkts_too_big++;
 240               goto do_trace;
 241             }
 242
 243           if ((o->option == 0xFF)  && ((u8 *)o <= end))
 244             {
 245               vnet_main_t *vnm = vnet_get_main();
 246               u16 old_l0, new_l0;
 247               ip4_address_t _ia0, * ia0 = &_ia0;
 248               dhcp_vss_t *vss;
 249               vnet_sw_interface_t *swif;
 250               sw_if_index = 0;
 251               original_sw_if_index = 0;
 252
 253               original_sw_if_index = sw_if_index =
 254                   vnet_buffer(b0)->sw_if_index[VLIB_RX];
 255               swif = vnet_get_sw_interface (vnm, sw_if_index);
 256               if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 257                   sw_if_index = swif->unnumbered_sw_if_index;
 258
 259               /*
 260                * Get the first ip4 address on the [client-side]
 261                * RX interface, if not unnumbered. otherwise use
 262                * the loopback interface's ip address.
 263                */
 264               ia0 = ip4_interface_first_address(&ip4_main, sw_if_index, 0);
 265
 266               if (ia0 == 0)
 267                 {
 268                   error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 269                   next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 270                   pkts_no_interface_address++;
 271                   goto do_trace;
 272                 }
 273
 274               /* Add option 82 */
 275               o->option = 82;   /* option 82 */
 276               o->length = 12;   /* 12 octets to follow */
 277               o->data[0] = 1;   /* suboption 1, circuit ID (=FIB id) */
 278               o->data[1] = 4;   /* length of suboption */
 279               u32 *o_ifid = (u32 *) &o->data[2];
 280               *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
 281               o->data[6] = 5; /* suboption 5 (client RX intfc address) */
 282               o->data[7] = 4; /* length 4 */
 283               u32 *o_addr = (u32 *) &o->data[8];
 284               *o_addr = ia0->as_u32;
 285               o->data[12] = 0xFF;
 286
 287               vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
 288               if (vss)
 289                 {
 290                   u32 id_len;                   /* length of VPN ID */
 291
 292                   if (vss->vss_type == VSS_TYPE_VPN_ID)
 293                     {
 294                       id_len = sizeof (vss->vpn_id);    /* vpn_id is 7 bytes */
 295                       memcpy (&o->data[15], vss->vpn_id, id_len);
 296                     }
 297                   else if (vss->vss_type == VSS_TYPE_ASCII)
 298                     {
 299                       id_len = vec_len (vss->vpn_ascii_id);
 300                       memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
 301                     }
 302                   else  /* must be VSS_TYPE_DEFAULT, no VPN ID */
 303                     id_len = 0;
 304
 305                   o->data[12] = 151;            /* vss suboption */
 306                   o->data[13] = id_len + 1;     /* length: vss_type + id_len */
 307                   o->data[14] = vss->vss_type;  /* vss option type */
 308                   o->data[15 + id_len] = 152;   /* vss control suboption */
 309                   o->data[16 + id_len] = 0;     /* length */
 310                   o->data[17 + id_len] = 0xFF;  /* "end-of-options" (0xFF) */
 311                   /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
 312                   o->length += id_len + 5;
 313                 }
 314
 315               len = o->length + 3;
 316               b0->current_length += len;
 317               /* Fix IP header length and checksum */
 318               old_l0 = ip0->length;
 319               new_l0 = clib_net_to_host_u16 (old_l0);
 320               new_l0 += len;
 321               new_l0 = clib_host_to_net_u16 (new_l0);
 322               ip0->length = new_l0;
 323               sum0 = ip0->checksum;
 324               sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 325                                      length /* changed member */);
 326               ip0->checksum = ip_csum_fold (sum0);
 327
 328               /* Fix UDP length */
 329               new_l0 = clib_net_to_host_u16 (u0->length);
 330               new_l0 += len;
 331               u0->length = clib_host_to_net_u16 (new_l0);
 332             }
 333           else
 334             {
 335               vlib_node_increment_counter
 336                   (vm, dhcp_proxy_to_server_node.index,
 337                    DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
 338             }
 339
 340           next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 341
 342           /*
 343            * If we have multiple servers configured and this is the
 344            * client's discover message, then send copies to each of
 345            * those servers
 346            */
 347           if (is_discover && vec_len(proxy->dhcp_servers) > 1)
 348             {
 349               u32 ii;
 350
 351               for (ii = 1; ii < vec_len(proxy->dhcp_servers); ii++)
 352                 {
 353                   vlib_buffer_t *c0;
 354                   u32 ci0;
 355
 356                   c0 = vlib_buffer_copy(vm, b0);
 357                   ci0 = vlib_get_buffer_index(vm, c0);
 358                   server = &proxy->dhcp_servers[ii];
 359
 360                   ip0 = vlib_buffer_get_current (c0);
 361
 362                   sum0 = ip0->checksum;
 363                   old0 = ip0->dst_address.as_u32;
 364                   new0 = server->dhcp_server.ip4.as_u32;
 365                   ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
 366                   sum0 = ip_csum_update (sum0, old0, new0,
 367                                          ip4_header_t /* structure */,
 368                                          dst_address /* changed member */);
 369                   ip0->checksum = ip_csum_fold (sum0);
 370
 371                   to_next[0] = ci0;
 372                   to_next += 1;
 373                   n_left_to_next -= 1;
 374
 375                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 376                                                    to_next, n_left_to_next,
 377                                                    ci0, next0);
 378
 379                   if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 380                     {
 381                       dhcp_proxy_trace_t *tr;
 382
 383                       tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
 384                       tr->which = 0; /* to server */
 385                       tr->error = error0;
 386                       tr->original_sw_if_index = original_sw_if_index;
 387                       tr->sw_if_index = sw_if_index;
 388                       if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
 389                           tr->trace_ip4_address.as_u32 = server->dhcp_server.ip4.as_u32;
 390                     }
 391
 392                   if (PREDICT_FALSE(0 == n_left_to_next))
 393                     {
 394                       vlib_put_next_frame (vm, node, next_index,
 395                                            n_left_to_next);
 396                       vlib_get_next_frame (vm, node, next_index,
 397                                            to_next, n_left_to_next);
 398                     }
 399               }
 400           }
 401         do_trace:
 402           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 403             {
 404                dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
 405                                                         b0, sizeof (*tr));
 406                tr->which = 0; /* to server */
 407                tr->error = error0;
 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;
 413             }
 414
 415         do_enqueue:
 416           to_next[0] = bi0;
 417           to_next += 1;
 418           n_left_to_next -= 1;
 419
 420           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 421                                            to_next, n_left_to_next,
 422                                            bi0, next0);
 423         }
 424
 425       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 426     }
 427
 428   vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
 429                                DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
 430                                pkts_to_client);
 431   vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
 432                                DHCP_PROXY_ERROR_RELAY_TO_SERVER,
 433                                pkts_to_server);
 434   vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
 435                                DHCP_PROXY_ERROR_NO_SERVER,
 436                                pkts_no_server);
 437   vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
 438                                DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 439                                pkts_no_interface_address);
 440  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
 441                               DHCP_PROXY_ERROR_PKT_TOO_BIG,
 442                               pkts_too_big);
 443   return from_frame->n_vectors;
 444 }
 445
 446 VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
 447   .function = dhcp_proxy_to_server_input,
 448   .name = "dhcp-proxy-to-server",
 449   /* Takes a vector of packets. */
 450   .vector_size = sizeof (u32),
 451
 452   .n_errors = DHCP_PROXY_N_ERROR,
 453   .error_strings = dhcp_proxy_error_strings,
 454
 455   .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
 456   .next_nodes = {
 457 #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 458     foreach_dhcp_proxy_to_server_input_next
 459 #undef _
 460   },
 461
 462   .format_buffer = format_dhcp_proxy_header_with_length,
 463   .format_trace = format_dhcp_proxy_trace,
 464 #if 0
 465   .unformat_buffer = unformat_dhcp_proxy_header,
 466 #endif
 467 };
 468
 469 static uword
 470 dhcp_proxy_to_client_input (vlib_main_t * vm,
 471                             vlib_node_runtime_t * node,
 472                             vlib_frame_t * from_frame)
 473 {
 474   u32 n_left_from, * from;
 475   ethernet_main_t *em = ethernet_get_main (vm);
 476   dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
 477   vnet_main_t * vnm = vnet_get_main();
 478   ip4_main_t * im = &ip4_main;
 479
 480   from = vlib_frame_vector_args (from_frame);
 481   n_left_from = from_frame->n_vectors;
 482
 483   while (n_left_from > 0)
 484     {
 485       u32 bi0;
 486       vlib_buffer_t * b0;
 487       udp_header_t * u0;
 488       dhcp_header_t * h0;
 489       ip4_header_t * ip0 = 0;
 490       ip4_address_t * ia0 = 0;
 491       u32 old0, new0;
 492       ip_csum_t sum0;
 493       ethernet_interface_t *ei0;
 494       ethernet_header_t *mac0;
 495       vnet_hw_interface_t *hi0;
 496       vlib_frame_t *f0;
 497       u32 * to_next0;
 498       u32 sw_if_index = ~0;
 499       vnet_sw_interface_t *si0;
 500       u32 error0 = (u32)~0;
 501       vnet_sw_interface_t *swif;
 502       u32 fib_index;
 503       dhcp_proxy_t *proxy;
 504       dhcp_server_t *server;
 505       u32 original_sw_if_index = (u32) ~0;
 506       ip4_address_t relay_addr = {
 507           .as_u32 = 0,
 508       };
 509
 510       bi0 = from[0];
 511       from += 1;
 512       n_left_from -= 1;
 513
 514       b0 = vlib_get_buffer (vm, bi0);
 515       h0 = vlib_buffer_get_current (b0);
 516
 517       /*
 518        * udp_local hands us the DHCP header, need udp hdr,
 519        * ip hdr to relay to client
 520        */
 521       vlib_buffer_advance (b0, -(sizeof(*u0)));
 522       u0 = vlib_buffer_get_current (b0);
 523
 524       vlib_buffer_advance (b0, -(sizeof(*ip0)));
 525       ip0 = vlib_buffer_get_current (b0);
 526
 527       /* Consumed by dhcp client code? */
 528       if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
 529           continue;
 530
 531       if (1 /* dpm->insert_option_82 */)
 532         {
 533           dhcp_option_t *o = (dhcp_option_t *) h0->options;
 534           dhcp_option_t *sub;
 535
 536           /* Parse through TLVs looking for option 82.
 537              The circuit-ID is the FIB number we need
 538              to track down the client-facing interface */
 539
 540           while (o->option != 0xFF /* end of options */ &&
 541                  (u8 *) o < (b0->data + b0->current_data + b0->current_length))
 542             {
 543               if (o->option == 82)
 544                 {
 545                     u32 vss_exist = 0;
 546                     u32 vss_ctrl = 0;
 547                     sub = (dhcp_option_t *) &o->data[0];
 548                     while (sub->option != 0xFF /* end of options */ &&
 549                            (u8 *) sub < (u8 *)(o + o->length)) {
 550                         /* If this is one of ours, it will have
 551                            total length 12, circuit-id suboption type,
 552                            and the sw_if_index */
 553                         if (sub->option == 1 && sub->length == 4)
 554                           {
 555                             sw_if_index = ((sub->data[0] << 24) |
 556                                            (sub->data[1] << 16) |
 557                                            (sub->data[2] << 8)  |
 558                                            (sub->data[3]));
 559                           }
 560                         else if (sub->option == 5 && sub->length == 4)
 561                           {
 562                               relay_addr.as_u8[0] = sub->data[0];
 563                               relay_addr.as_u8[1] = sub->data[1];
 564                               relay_addr.as_u8[2] = sub->data[2];
 565                               relay_addr.as_u8[3] = sub->data[3];
 566                           }
 567                         else if (sub->option == 151 &&
 568                                  sub->length == 7 &&
 569                                  sub->data[0] == 1)
 570                             vss_exist = 1;
 571                         else if (sub->option == 152 && sub->length == 0)
 572                             vss_ctrl = 1;
 573                         sub = (dhcp_option_t *)
 574                           (((uword) sub) + (sub->length + 2));
 575                     }
 576                     if (vss_ctrl && vss_exist)
 577                       vlib_node_increment_counter
 578                         (vm, dhcp_proxy_to_client_node.index,
 579                          DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
 580
 581                 }
 582               o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
 583             }
 584         }
 585
 586       if (sw_if_index == (u32)~0)
 587         {
 588           error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
 589
 590         drop_packet:
 591           vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
 592                                        error0, 1);
 593           f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
 594           to_next0 = vlib_frame_vector_args (f0);
 595           to_next0[0] = bi0;
 596           f0->n_vectors = 1;
 597           vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
 598           goto do_trace;
 599         }
 600
 601       if (relay_addr.as_u32 == 0)
 602         {
 603           error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
 604           goto drop_packet;
 605         }
 606
 607       if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 608         {
 609           error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
 610           goto drop_packet;
 611         }
 612
 613       fib_index = im->fib_index_by_sw_if_index [sw_if_index];
 614       proxy = dhcp_get_proxy(dpm, fib_index, FIB_PROTOCOL_IP4);
 615
 616       if (PREDICT_FALSE (NULL == proxy))
 617         {
 618           error0 = DHCP_PROXY_ERROR_NO_SERVER;
 619           goto drop_packet;
 620         }
 621
 622       vec_foreach(server, proxy->dhcp_servers)
 623         {
 624           if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
 625             {
 626               goto server_found;
 627             }
 628         }
 629
 630       error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 631       goto drop_packet;
 632
 633     server_found:
 634       vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
 635
 636       swif = vnet_get_sw_interface (vnm, sw_if_index);
 637       original_sw_if_index = sw_if_index;
 638       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 639           sw_if_index = swif->unnumbered_sw_if_index;
 640
 641       ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
 642       if (ia0 == 0)
 643         {
 644           error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 645           goto drop_packet;
 646         }
 647
 648       if (relay_addr.as_u32 != ia0->as_u32)
 649         {
 650           error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
 651           goto drop_packet;
 652         }
 653
 654       u0->checksum = 0;
 655       u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
 656       sum0 = ip0->checksum;
 657       old0 = ip0->dst_address.as_u32;
 658       new0 = 0xFFFFFFFF;
 659       ip0->dst_address.as_u32 = new0;
 660       sum0 = ip_csum_update (sum0, old0, new0,
 661                             ip4_header_t /* structure */,
 662                             dst_address /* offset of changed member */);
 663       ip0->checksum = ip_csum_fold (sum0);
 664
 665       sum0 = ip0->checksum;
 666       old0 = ip0->src_address.as_u32;
 667       new0 = ia0->as_u32;
 668       ip0->src_address.as_u32 = new0;
 669       sum0 = ip_csum_update (sum0, old0, new0,
 670                             ip4_header_t /* structure */,
 671                             src_address /* offset of changed member */);
 672       ip0->checksum = ip_csum_fold (sum0);
 673
 674       vlib_buffer_advance (b0, -(sizeof(ethernet_header_t)));
 675       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 676       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 677           vlib_buffer_advance (b0, -4 /* space for VLAN tag */);
 678
 679       mac0 = vlib_buffer_get_current (b0);
 680
 681       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 682       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 683       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 684       memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 685       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 686         clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x0800);
 687
 688       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 689         {
 690           u32 * vlan_tag = (u32 *)(mac0+1);
 691           u32 tmp;
 692           tmp = (si0->sub.id << 16) | 0x0800;
 693           *vlan_tag = clib_host_to_net_u32 (tmp);
 694         }
 695
 696       /* $$$ This needs to be rewritten, for sure */
 697       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 698       to_next0 = vlib_frame_vector_args (f0);
 699       to_next0[0] = bi0;
 700       f0->n_vectors = 1;
 701       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 702
 703     do_trace:
 704       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 705         {
 706           dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
 707                                                    b0, sizeof (*tr));
 708           tr->which = 1; /* to client */
 709           tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
 710           tr->error = error0;
 711           tr->original_sw_if_index = original_sw_if_index;
 712           tr->sw_if_index = sw_if_index;
 713         }
 714     }
 715   return from_frame->n_vectors;
 716 }
 717
 718 VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
 719   .function = dhcp_proxy_to_client_input,
 720   .name = "dhcp-proxy-to-client",
 721   /* Takes a vector of packets. */
 722   .vector_size = sizeof (u32),
 723
 724   .n_errors = DHCP_PROXY_N_ERROR,
 725   .error_strings = dhcp_proxy_error_strings,
 726   .format_buffer = format_dhcp_proxy_header_with_length,
 727   .format_trace = format_dhcp_proxy_trace,
 728 #if 0
 729   .unformat_buffer = unformat_dhcp_proxy_header,
 730 #endif
 731 };
 732
 733 static clib_error_t *
 734 dhcp4_proxy_init (vlib_main_t * vm)
 735 {
 736   dhcp_proxy_main_t * dm = &dhcp_proxy_main;
 737   vlib_node_t * error_drop_node;
 738
 739   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 740   dm->error_drop_node_index = error_drop_node->index;
 741
 742   udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
 743                          dhcp_proxy_to_client_node.index, 1 /* is_ip4 */);
 744
 745   udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
 746                          dhcp_proxy_to_server_node.index, 1 /* is_ip4 */);
 747
 748   return 0;
 749 }
 750
 751
 752 VLIB_INIT_FUNCTION (dhcp4_proxy_init);
 753
 754 int
 755 dhcp4_proxy_set_server (ip46_address_t *addr,
 756                         ip46_address_t *src_addr,
 757                         u32 rx_table_id,
 758                         u32 server_table_id,
 759                         int is_del)
 760 {
 761   u32 rx_fib_index = 0;
 762   int rc = 0;
 763
 764   const fib_prefix_t all_1s =
 765   {
 766       .fp_len = 32,
 767       .fp_addr.ip4.as_u32 = 0xffffffff,
 768       .fp_proto = FIB_PROTOCOL_IP4,
 769   };
 770
 771   if (ip46_address_is_zero(addr))
 772     return VNET_API_ERROR_INVALID_DST_ADDRESS;
 773
 774   if (ip46_address_is_zero(src_addr))
 775     return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 776
 777   rx_fib_index = fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP4,
 778                                                    rx_table_id,
 779                                                    FIB_SOURCE_DHCP);
 780
 781   if (is_del)
 782     {
 783       if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
 784                                  addr, server_table_id))
 785       {
 786           fib_table_entry_special_remove(rx_fib_index,
 787                                          &all_1s,
 788                                          FIB_SOURCE_DHCP);
 789           fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
 790       }
 791     }
 792   else
 793   {
 794       if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
 795                                  addr, src_addr,
 796                                  rx_fib_index, server_table_id))
 797       {
 798           fib_table_entry_special_add(rx_fib_index,
 799                                       &all_1s,
 800                                       FIB_SOURCE_DHCP,
 801                                       FIB_ENTRY_FLAG_LOCAL);
 802           fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
 803       }
 804   }
 805   fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
 806
 807   return (rc);
 808 }
 809
 810 static clib_error_t *
 811 dhcp4_proxy_set_command_fn (vlib_main_t * vm,
 812                             unformat_input_t * input,
 813                             vlib_cli_command_t * cmd)
 814 {
 815   ip46_address_t server_addr, src_addr;
 816   u32 server_table_id = 0, rx_table_id = 0;
 817   int is_del = 0;
 818   int set_src = 0, set_server = 0;
 819
 820   memset(&server_addr, 0, sizeof(server_addr));
 821   memset(&src_addr, 0, sizeof(src_addr));
 822
 823   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
 824     {
 825       if (unformat (input, "server %U",
 826                     unformat_ip4_address, &server_addr.ip4))
 827         set_server = 1;
 828       else if (unformat (input, "server-fib-id %d", &server_table_id))
 829         ;
 830       else if (unformat (input, "rx-fib-id %d", &rx_table_id))
 831         ;
 832       else if (unformat(input, "src-address %U",
 833                         unformat_ip4_address, &src_addr.ip4))
 834         set_src = 1;
 835       else if (unformat (input, "delete") ||
 836                unformat (input, "del"))
 837         is_del = 1;
 838       else
 839         break;
 840     }
 841
 842   if (is_del || (set_server && set_src))
 843     {
 844       int rv;
 845
 846       rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
 847                                    server_table_id, is_del);
 848       switch (rv)
 849         {
 850         case 0:
 851           return 0;
 852
 853         case VNET_API_ERROR_INVALID_DST_ADDRESS:
 854           return clib_error_return (0, "Invalid server address");
 855
 856         case VNET_API_ERROR_INVALID_SRC_ADDRESS:
 857           return clib_error_return (0, "Invalid src address");
 858
 859         case VNET_API_ERROR_NO_SUCH_ENTRY:
 860           return clib_error_return
 861             (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
 862
 863         default:
 864           return clib_error_return (0, "BUG: rv %d", rv);
 865         }
 866     }
 867   else
 868     return clib_error_return (0, "parse error`%U'",
 869                               format_unformat_error, input);
 870 }
 871
 872 VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
 873   .path = "set dhcp proxy",
 874   .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
 875   .function = dhcp4_proxy_set_command_fn,
 876 };
 877
 878 static u8 *
 879 format_dhcp4_proxy_server (u8 * s, va_list * args)
 880 {
 881   dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
 882   ip4_fib_t * rx_fib, * server_fib;
 883   dhcp_server_t *server;
 884
 885   if (proxy == 0)
 886     {
 887         s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
 888                     "Servers FIB,Address");
 889       return s;
 890     }
 891
 892   rx_fib = ip4_fib_get(proxy->rx_fib_index);
 893
 894   s = format (s, "%=14u%=16U",
 895               rx_fib->table_id,
 896               format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
 897
 898   vec_foreach(server, proxy->dhcp_servers)
 899   {
 900       server_fib = ip4_fib_get(server->server_fib_index);
 901       s = format (s, "%u,%U  ",
 902                   server_fib->table_id,
 903                   format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
 904   }
 905   return s;
 906 }
 907
 908 static int
 909 dhcp4_proxy_show_walk (dhcp_proxy_t *server,
 910                        void *ctx)
 911 {
 912     vlib_main_t * vm = ctx;
 913
 914     vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
 915
 916     return (1);
 917 }
 918
 919 static clib_error_t *
 920 dhcp4_proxy_show_command_fn (vlib_main_t * vm,
 921                              unformat_input_t * input,
 922                              vlib_cli_command_t * cmd)
 923 {
 924   vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, NULL /* header line */);
 925
 926   dhcp_proxy_walk(FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);
 927
 928   return (NULL);
 929 }
 930
 931 VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
 932   .path = "show dhcp proxy",
 933   .short_help = "Display dhcp proxy server info",
 934   .function = dhcp4_proxy_show_command_fn,
 935 };
 936
 937 static clib_error_t *
 938 dhcp_option_82_vss_fn (vlib_main_t * vm,
 939                         unformat_input_t * input,
 940                         vlib_cli_command_t * cmd)
 941 {
 942   u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
 943   u32 oui = 0, fib_id = 0, tbl_id = ~0;
 944   u8 *vpn_ascii_id = 0;
 945
 946   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
 947     {
 948       if (unformat (input, "table %d", &tbl_id))
 949           ;
 950       else if (unformat (input, "oui %d", &oui))
 951           vss_type = VSS_TYPE_VPN_ID;
 952       else if (unformat (input, "vpn-id %d", &fib_id))
 953           vss_type = VSS_TYPE_VPN_ID;
 954       else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
 955           vss_type = VSS_TYPE_ASCII;
 956       else if (unformat(input, "delete") || unformat(input, "del"))
 957           is_del = 1;
 958       else
 959         break;
 960     }
 961
 962   if (tbl_id == ~0)
 963       return clib_error_return (0, "no table ID specified.");
 964
 965   int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
 966                                vpn_ascii_id, oui, fib_id, is_del);
 967   switch (rv)
 968     {
 969     case 0:
 970         return 0;
 971     case VNET_API_ERROR_NO_SUCH_ENTRY:
 972         return clib_error_return (0, "option 82 vss for table %d not found in in pool.",
 973                                   tbl_id);
 974     default:
 975         return clib_error_return (0, "BUG: rv %d", rv);
 976
 977     }
 978 }
 979
 980 VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
 981   .path = "set dhcp option-82 vss",
 982   .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
 983   .function = dhcp_option_82_vss_fn,
 984 };
 985
 986 static clib_error_t *
 987 dhcp_vss_show_command_fn (vlib_main_t * vm,
 988                           unformat_input_t * input,
 989                           vlib_cli_command_t * cmd)
 990
 991 {
 992   dhcp_vss_walk(FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);
 993
 994   return (NULL);
 995 }
 996
 997 VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
 998   .path = "show dhcp vss",
 999   .short_help = "show dhcp VSS",
1000   .function = dhcp_vss_show_command_fn,
1001 };
1002
1003 static clib_error_t *
1004 dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
1005                                 unformat_input_t * input,
1006                                 vlib_cli_command_t * cmd)
1007
1008 {
1009   vnet_main_t *vnm = vnet_get_main();
1010   u32 sw_if_index0=0, sw_if_index;
1011   vnet_sw_interface_t *swif;
1012   ip4_address_t *ia0;
1013
1014   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1015     {
1016
1017       if (unformat(input, "%U",
1018                    unformat_vnet_sw_interface, vnm, &sw_if_index0))
1019         {
1020           swif = vnet_get_sw_interface (vnm, sw_if_index0);
1021           sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1022             swif->unnumbered_sw_if_index : sw_if_index0;
1023           ia0 = ip4_interface_first_address(&ip4_main, sw_if_index, 0);
1024           if (ia0)
1025             {
1026               vlib_cli_output (vm, "%=20s%=20s", "interface",
1027                                "source IP address");
1028
1029               vlib_cli_output (vm, "%=20U%=20U",
1030                                format_vnet_sw_if_index_name,
1031                                vnm, sw_if_index0,
1032                                format_ip4_address, ia0);
1033             }
1034           else
1035             vlib_cli_output (vm, "%=34s %=20U",
1036                              "No IPv4 address configured on",
1037                              format_vnet_sw_if_index_name,
1038                              vnm, sw_if_index);
1039         }
1040       else
1041         break;
1042     }
1043
1044   return 0;
1045 }
1046
1047 VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
1048   .path = "show dhcp option-82-address interface",
1049   .short_help = "show dhcp option-82-address interface <interface>",
1050   .function = dhcp_option_82_address_show_command_fn,
1051 };