2 * Copyright (c) 2017 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/dns/dns.h>
18 #include <vlib/vlib.h>
19 #include <vnet/vnet.h>
21 vlib_node_registration_t dns46_request_node;
27 } dns46_request_trace_t;
29 /* packet trace format function */
31 format_dns46_request_trace (u8 * s, va_list * args)
33 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
34 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
35 dns46_request_trace_t *t = va_arg (*args, dns46_request_trace_t *);
37 s = format (s, "DNS46_REPLY: pool index %d, disposition %d",
38 t->pool_index, t->disposition);
42 vlib_node_registration_t dns46_request_node;
44 static char *dns46_request_error_strings[] = {
45 #define _(sym,string) string,
46 foreach_dns46_request_error
52 DNS46_REQUEST_NEXT_DROP,
53 DNS46_REQUEST_NEXT_IP_LOOKUP,
54 DNS46_REQUEST_NEXT_PUNT,
56 } dns46_request_next_t;
59 dns46_request_inline (vlib_main_t * vm,
60 vlib_node_runtime_t * node, vlib_frame_t * frame,
63 u32 n_left_from, *from, *to_next;
64 dns46_request_next_t next_index;
65 dns_main_t *dm = &dns_main;
67 from = vlib_frame_vector_args (frame);
68 n_left_from = frame->n_vectors;
69 next_index = node->cached_next_index;
71 while (n_left_from > 0)
75 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
78 while (n_left_from >= 4 && n_left_to_next >= 2)
80 u32 next0 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT;
81 u32 next1 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT;
82 u32 sw_if_index0, sw_if_index1;
84 ethernet_header_t *en0, *en1;
86 vlib_buffer_t *b0, *b1;
88 /* Prefetch next iteration. */
90 vlib_buffer_t *p2, *p3;
92 p2 = vlib_get_buffer (vm, from[2]);
93 p3 = vlib_get_buffer (vm, from[3]);
95 vlib_prefetch_buffer_header (p2, LOAD);
96 vlib_prefetch_buffer_header (p3, LOAD);
98 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
99 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
102 /* speculatively enqueue b0 and b1 to the current next frame */
103 to_next[0] = bi0 = from[0];
104 to_next[1] = bi1 = from[1];
110 b0 = vlib_get_buffer (vm, bi0);
111 b1 = vlib_get_buffer (vm, bi1);
113 /* $$$$$ End of processing 2 x packets $$$$$ */
115 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
117 if (b0->flags & VLIB_BUFFER_IS_TRACED)
119 dns46_request_trace_t *t =
120 vlib_add_trace (vm, node, b0, sizeof (*t));
121 t->sw_if_index = sw_if_index0;
122 t->next_index = next0;
124 if (b1->flags & VLIB_BUFFER_IS_TRACED)
126 dns46_request_trace_t *t =
127 vlib_add_trace (vm, node, b1, sizeof (*t));
128 t->sw_if_index = sw_if_index1;
129 t->next_index = next1;
133 /* verify speculative enqueues, maybe switch current next frame */
134 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
135 to_next, n_left_to_next,
136 bi0, bi1, next0, next1);
140 while (n_left_from > 0 && n_left_to_next > 0)
144 u32 next0 = DNS46_REQUEST_NEXT_DROP;
145 u32 error0 = DNS46_REQUEST_ERROR_NONE;
149 ip4_header_t *ip40 = 0;
150 ip6_header_t *ip60 = 0;
151 dns_cache_entry_t *ep0;
152 dns_pending_request_t _t0, *t0 = &_t0;
154 u32 pool_index0 = ~0;
158 /* speculatively enqueue b0 to the current next frame */
166 b0 = vlib_get_buffer (vm, bi0);
167 d0 = vlib_buffer_get_current (b0);
168 u0 = (udp_header_t *) ((u8 *) d0 - sizeof (*u0));
170 if (PREDICT_FALSE (dm->is_enabled == 0))
172 next0 = DNS46_REQUEST_NEXT_PUNT;
178 ip60 = (ip6_header_t *) (((u8 *) u0) - sizeof (ip6_header_t));
179 next0 = DNS46_REQUEST_NEXT_DROP;
180 error0 = DNS46_REQUEST_ERROR_UNIMPLEMENTED;
185 ip40 = (ip4_header_t *) (((u8 *) u0) - sizeof (ip4_header_t));
186 if (ip40->ip_version_and_header_length != 0x45)
188 error0 = DNS46_REQUEST_ERROR_IP_OPTIONS;
192 /* Parse through the DNS request */
193 flags0 = clib_net_to_host_u16 (d0->flags);
198 next0 = DNS46_REQUEST_NEXT_DROP;
199 error0 = DNS46_REQUEST_ERROR_BAD_REQUEST;
202 if (clib_net_to_host_u16 (d0->qdcount) != 1)
204 next0 = DNS46_REQUEST_NEXT_DROP;
205 error0 = DNS46_REQUEST_ERROR_TOO_MANY_REQUESTS;
209 label0 = (u8 *) (d0 + 1);
212 * vnet_dns_labels_to_name produces a non NULL terminated vector
213 * vnet_dns_resolve_name expects a C-string.
215 name0 = vnet_dns_labels_to_name (label0, (u8 *) d0, (u8 **) & q0);
217 _vec_len (name0) -= 1;
219 t0->request_type = DNS_PEER_PENDING_NAME_TO_IP;
222 * See if this is a reverse lookup. Both ip4 and ip6 reverse
223 * requests end with ".arpa"
225 if (PREDICT_TRUE (vec_len (name0) > 5))
227 u8 *aptr0 = name0 + vec_len (name0) - 5;
229 if (!memcmp (aptr0, ".arpa", 5))
230 t0->request_type = DNS_PEER_PENDING_IP_TO_NAME;
233 t0->client_index = ~0;
235 t0->dst_port = u0->src_port;
239 clib_memcpy_fast (t0->dst_address, ip60->src_address.as_u8,
240 sizeof (ip6_address_t));
242 clib_memcpy_fast (t0->dst_address, ip40->src_address.as_u8,
243 sizeof (ip4_address_t));
245 vnet_dns_resolve_name (dm, name0, t0, &ep0);
250 vnet_send_dns6_reply (dm, t0, ep0, b0);
252 vnet_send_dns4_reply (dm, t0, ep0, b0);
253 next0 = DNS46_REQUEST_NEXT_IP_LOOKUP;
257 error0 = DNS46_REQUEST_ERROR_RESOLUTION_REQUIRED;
261 b0->error = node->errors[error0];
263 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
264 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
266 dns46_request_trace_t *t =
267 vlib_add_trace (vm, node, b0, sizeof (*t));
268 t->disposition = error0;
269 t->pool_index = pool_index0;
272 /* verify speculative enqueue, maybe switch current next frame */
273 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
274 to_next, n_left_to_next,
278 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
281 return frame->n_vectors;
285 dns4_request_node_fn (vlib_main_t * vm,
286 vlib_node_runtime_t * node, vlib_frame_t * frame)
289 return dns46_request_inline (vm, node, frame, 0 /* is_ip6 */ );
293 VLIB_REGISTER_NODE (dns4_request_node) =
295 .function = dns4_request_node_fn,
296 .name = "dns4-request",
297 .vector_size = sizeof (u32),
298 .format_trace = format_dns46_request_trace,
299 .type = VLIB_NODE_TYPE_INTERNAL,
300 .n_errors = ARRAY_LEN (dns46_request_error_strings),
301 .error_strings = dns46_request_error_strings,
302 .n_next_nodes = DNS46_REQUEST_N_NEXT,
304 [DNS46_REQUEST_NEXT_DROP] = "error-drop",
305 [DNS46_REQUEST_NEXT_PUNT] = "error-punt",
306 [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip4-lookup",
312 dns6_request_node_fn (vlib_main_t * vm,
313 vlib_node_runtime_t * node, vlib_frame_t * frame)
316 return dns46_request_inline (vm, node, frame, 1 /* is_ip6 */ );
320 VLIB_REGISTER_NODE (dns6_request_node) =
322 .function = dns6_request_node_fn,
323 .name = "dns6-request",
324 .vector_size = sizeof (u32),
325 .format_trace = format_dns46_request_trace,
326 .type = VLIB_NODE_TYPE_INTERNAL,
327 .n_errors = ARRAY_LEN (dns46_request_error_strings),
328 .error_strings = dns46_request_error_strings,
329 .n_next_nodes = DNS46_REQUEST_N_NEXT,
331 [DNS46_REQUEST_NEXT_DROP] = "error-drop",
332 [DNS46_REQUEST_NEXT_PUNT] = "error-punt",
333 [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip6-lookup",
339 * fd.io coding-style-patch-verification: ON
342 * eval: (c-set-style "gnu")