2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/ethernet/ethernet.h>
17 #include <dhcp/dhcp6_packet.h>
18 #include <dhcp/dhcp6_client_common_dp.h>
19 #include <dhcp/dhcp6_ia_na_client_dp.h>
20 #include <dhcp/dhcp6_pd_client_dp.h>
21 #include <dhcp/dhcp6_packet.h>
22 #include <vnet/udp/udp.h>
24 dhcp6_client_common_main_t dhcp6_client_common_main;
25 dhcpv6_duid_ll_string_t client_duid;
28 server_index_get_or_create (u8 * data, u16 len)
30 dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main;
35 for (i = 0; i < vec_len (ccm->server_ids); i++)
37 se = &ccm->server_ids[i];
38 if (se->len == len && 0 == memcmp (se->data, data, len))
44 vec_validate (new_se.data, len - 1);
45 memcpy (new_se.data, data, len);
47 vec_add1 (ccm->server_ids, new_se);
49 return vec_len (ccm->server_ids) - 1;
53 generate_client_duid (void)
55 client_duid.duid_type = clib_host_to_net_u16 (DHCPV6_DUID_LL);
56 client_duid.hardware_type = clib_host_to_net_u16 (1);
58 vnet_main_t *vnm = vnet_get_main ();
59 vnet_interface_main_t *im = &vnm->interface_main;
60 vnet_hw_interface_t *hi;
61 ethernet_interface_t *eth_if = 0;
64 pool_foreach (hi, im->hw_interfaces,
66 eth_if = ethernet_get_interface (ðernet_main, hi->hw_if_index);
73 clib_memcpy (client_duid.lla, eth_if->address, 6);
76 clib_warning ("Failed to find any Ethernet interface, "
77 "setting DHCPv6 DUID link-layer address to random value");
78 u32 seed = random_default_seed ();
80 client_duid.lla[0] = 0xc2; /* locally administered unicast */
81 client_duid.lla[1] = 0x18;
82 client_duid.lla[2] = 0x44;
83 client_duid.lla[3] = random_u32 (&seed);
84 client_duid.lla[4] = random_u32 (&seed);
85 client_duid.lla[5] = random_u32 (&seed);
89 #define foreach_dhcpv6_client \
90 _(DROP, "error-drop") \
91 _(LOOKUP, "ip6-lookup")
95 #define _(sym,str) DHCPV6_CLIENT_NEXT_##sym,
99 } dhcpv6_client_next_t;
102 * per-packet trace data
104 typedef struct dhcpv6_client_trace_t_
106 } dhcpv6_client_trace_t;
109 format_dhcpv6_client_trace (u8 * s, va_list * args)
111 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
112 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
113 //dhcpv6_client_trace_t *t = va_arg (*args, dhcpv6_client_trace_t *);
115 s = format (s, "nothing");
121 dhcpv6_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
122 vlib_frame_t * frame)
124 dhcp6_ia_na_client_main_t *icm = &dhcp6_ia_na_client_main;
125 dhcp6_pd_client_main_t *pcm = &dhcp6_pd_client_main;
127 dhcpv6_client_next_t next_index;
128 u32 n_left_from, *from, *to_next;
130 n_left_from = frame->n_vectors;
131 from = vlib_frame_vector_args (frame);
133 while (n_left_from > 0)
137 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
139 while (n_left_from > 0 && n_left_to_next > 0)
143 dhcpv6_header_t *dhcpv60;
144 dhcpv6_option_t *option;
146 dhcp6_report_common_t report;
147 dhcp6_address_info_t *addresses = 0;
148 dhcp6_prefix_info_t *prefixes = 0;
149 u32 next0 = DHCPV6_CLIENT_NEXT_DROP;
154 u8 client_id_present = 0;
158 dhcp6_ia_na_client_state_t *ia_na_client_state = NULL;
159 dhcp6_pd_client_state_t *pd_client_state = NULL;
168 b0 = vlib_get_buffer (vm, bi0);
170 dhcpv60 = vlib_buffer_get_current (b0);
171 ip0 = (void *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
172 u32 dhcpv6_ip6_payload_offset =
173 (u8 *) dhcpv60 - ((u8 *) ip0 + sizeof (*ip0));
175 clib_net_to_host_u16 (ip0->payload_length) -
176 dhcpv6_ip6_payload_offset - sizeof (*dhcpv60);
178 clib_memset (&report, 0, sizeof (report));
180 sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
181 if (sw_if_index >= vec_len (icm->client_state_by_sw_if_index))
182 ia_na_client_state = 0;
185 &icm->client_state_by_sw_if_index[sw_if_index];
186 if (sw_if_index >= vec_len (pcm->client_state_by_sw_if_index))
189 pd_client_state = &pcm->client_state_by_sw_if_index[sw_if_index];
192 (dhcpv60->xid[0] << 16) + (dhcpv60->xid[1] << 8) +
194 if (ia_na_client_state && ia_na_client_state->transaction_id == xid)
196 else if (pd_client_state && pd_client_state->transaction_id == xid)
201 ("Received DHCPv6 message with wrong Transaction ID");
205 report.sw_if_index = sw_if_index;
206 report.msg_type = dhcpv60->msg_type;
207 report.server_index = ~0;
209 switch (dhcpv60->msg_type)
211 case DHCPV6_MSG_ADVERTISE:
212 case DHCPV6_MSG_REPLY:
213 option = (dhcpv6_option_t *) (dhcpv60 + 1);
214 while (options_length > 0)
217 clib_net_to_host_u16 (option->length) +
221 ("remaining payload length < option length (%d < %d)",
223 clib_net_to_host_u16 (option->length) +
227 u16 oo = clib_net_to_host_u16 (option->option);
228 if (oo == DHCPV6_OPTION_IA_NA || oo == DHCPV6_OPTION_IA_PD)
230 u8 discard_option = 0;
231 dhcpv6_ia_header_t *ia_header = (void *) option;
232 iaid = clib_net_to_host_u32 (ia_header->iaid);
233 u32 T1 = clib_net_to_host_u32 (ia_header->t1);
234 u32 T2 = clib_net_to_host_u32 (ia_header->t2);
235 if (iaid != DHCPV6_CLIENT_IAID)
237 if (T1 != 0 && T2 != 0 && T1 > T2)
244 dhcpv6_option_t *inner_option =
245 (void *) ia_header->data;
246 u16 inner_options_length =
247 clib_net_to_host_u16 (option->length) -
248 (sizeof (*ia_header) - sizeof (dhcpv6_option_t));
249 while (inner_options_length > 0)
252 clib_net_to_host_u16 (inner_option->option);
255 else if (inner_oo == DHCPV6_OPTION_IAADDR)
257 dhcpv6_ia_opt_addr_t *iaaddr =
258 (void *) inner_option;
259 u32 n_addresses = vec_len (addresses);
260 vec_validate (addresses, n_addresses);
261 dhcp6_address_info_t *address_info =
262 &addresses[n_addresses];
263 address_info->preferred_time =
264 clib_net_to_host_u32 (iaaddr->preferred);
265 address_info->valid_time =
266 clib_net_to_host_u32 (iaaddr->valid);
267 address_info->address = iaaddr->addr;
269 else if (inner_oo == DHCPV6_OPTION_IAPREFIX)
271 dhcpv6_ia_opt_pd_t *iaprefix =
272 (void *) inner_option;
273 u32 n_prefixes = vec_len (prefixes);
274 vec_validate (prefixes, n_prefixes);
275 dhcp6_prefix_info_t *prefix_info =
276 &prefixes[n_prefixes];
277 prefix_info->preferred_time =
278 clib_net_to_host_u32 (iaprefix->preferred);
279 prefix_info->valid_time =
280 clib_net_to_host_u32 (iaprefix->valid);
281 prefix_info->prefix_length = iaprefix->prefix;
282 prefix_info->prefix = iaprefix->addr;
284 else if (inner_oo == DHCPV6_OPTION_STATUS_CODE)
286 dhcpv6_status_code_t *sc =
287 (void *) inner_option;
288 report.inner_status_code =
289 clib_net_to_host_u16 (sc->status_code);
291 inner_options_length -=
292 sizeof (*inner_option) +
293 clib_net_to_host_u16 (inner_option->length);
295 (void *) ((u8 *) inner_option +
296 sizeof (*inner_option) +
298 (inner_option->length));
301 else if (oo == DHCPV6_OPTION_CLIENTID)
303 if (client_id_present)
306 ("Duplicate Client ID in received DHVPv6 message");
311 u16 len = clib_net_to_host_u16 (option->length);
312 client_id_present = 1;
313 if (len != CLIENT_DUID_LENGTH ||
314 0 != memcmp (option->data,
315 client_duid.bin_string,
319 ("Unrecognized client DUID inside received DHVPv6 message");
324 else if (oo == DHCPV6_OPTION_SERVERID)
326 if (report.server_index != ~0)
329 ("Duplicate Server ID in received DHVPv6 message");
334 u16 ol = clib_net_to_host_u16 (option->length);
335 if (ol - 2 /* 2 byte DUID type code */ > 128)
338 ("Server DUID (without type code) is longer than 128 octets");
343 report.server_index =
344 server_index_get_or_create (option->data, ol);
348 else if (oo == DHCPV6_OPTION_PREFERENCE)
350 report.preference = option->data[0];
352 else if (oo == DHCPV6_OPTION_STATUS_CODE)
354 dhcpv6_status_code_t *sc = (void *) option;
356 clib_net_to_host_u16 (sc->status_code);
359 sizeof (*option) + clib_net_to_host_u16 (option->length);
361 (void *) ((u8 *) option + sizeof (*option) +
362 clib_net_to_host_u16 (option->length));
365 if (!client_id_present)
368 ("Missing Client ID in received DHVPv6 message");
371 if (report.server_index == ~0)
374 ("Missing Server ID in received DHVPv6 message");
384 r.n_addresses = vec_len (addresses);
385 r.addresses = addresses;
386 dhcp6_publish_report (&r);
387 /* We just gave addresses to another process! */
394 r.n_prefixes = vec_len (prefixes);
395 r.prefixes = prefixes;
396 dhcp6_pd_publish_report (&r);
397 /* We just gave prefixes to another process! */
401 vec_free (addresses);
409 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
411 dhcpv6_client_trace_t *t =
412 vlib_add_trace (vm, node, b0, sizeof (*t));
415 /* verify speculative enqueue, maybe switch current next frame */
416 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
417 to_next, n_left_to_next,
421 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
424 return frame->n_vectors;
428 VLIB_REGISTER_NODE (dhcpv6_client_node, static) = {
429 .function = dhcpv6_client_node_fn,
430 .name = "dhcpv6-client",
431 .vector_size = sizeof (u32),
435 .n_next_nodes = DHCPV6_CLIENT_N_NEXT,
437 #define _(s,n) [DHCPV6_CLIENT_NEXT_##s] = n,
438 foreach_dhcpv6_client
442 .format_trace = format_dhcpv6_client_trace,
447 dhcp6_clients_enable_disable (u8 enable)
449 vlib_main_t *vm = vlib_get_main ();
453 if (client_duid.duid_type == 0)
454 generate_client_duid ();
455 udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
456 dhcpv6_client_node.index, 0 /* is_ip6 */ );
459 udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
464 * fd.io coding-style-patch-verification: ON
467 * eval: (c-set-style "gnu")