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_reply_node;
27 } dns46_reply_trace_t;
29 /* packet trace format function */
31 format_dns46_reply_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_reply_trace_t *t = va_arg (*args, dns46_reply_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_reply_node;
44 static char *dns46_reply_error_strings[] = {
45 #define _(sym,string) string,
46 foreach_dns46_reply_error
52 DNS46_REPLY_NEXT_DROP,
57 dns46_reply_node_fn (vlib_main_t * vm,
58 vlib_node_runtime_t * node, vlib_frame_t * frame)
60 u32 n_left_from, *from, *to_next;
61 dns46_reply_next_t next_index;
63 from = vlib_frame_vector_args (frame);
64 n_left_from = frame->n_vectors;
65 next_index = node->cached_next_index;
67 while (n_left_from > 0)
71 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
74 while (n_left_from >= 4 && n_left_to_next >= 2)
76 u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
77 u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
78 u32 sw_if_index0, sw_if_index1;
80 ethernet_header_t *en0, *en1;
82 vlib_buffer_t *b0, *b1;
84 /* Prefetch next iteration. */
86 vlib_buffer_t *p2, *p3;
88 p2 = vlib_get_buffer (vm, from[2]);
89 p3 = vlib_get_buffer (vm, from[3]);
91 vlib_prefetch_buffer_header (p2, LOAD);
92 vlib_prefetch_buffer_header (p3, LOAD);
94 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
95 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
98 /* speculatively enqueue b0 and b1 to the current next frame */
99 to_next[0] = bi0 = from[0];
100 to_next[1] = bi1 = from[1];
106 b0 = vlib_get_buffer (vm, bi0);
107 b1 = vlib_get_buffer (vm, bi1);
109 /* $$$$$ End of processing 2 x packets $$$$$ */
111 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
113 if (b0->flags & VLIB_BUFFER_IS_TRACED)
115 dns46_reply_trace_t *t =
116 vlib_add_trace (vm, node, b0, sizeof (*t));
117 t->sw_if_index = sw_if_index0;
118 t->next_index = next0;
120 if (b1->flags & VLIB_BUFFER_IS_TRACED)
122 dns46_reply_trace_t *t =
123 vlib_add_trace (vm, node, b1, sizeof (*t));
124 t->sw_if_index = sw_if_index1;
125 t->next_index = next1;
129 /* verify speculative enqueues, maybe switch current next frame */
130 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
131 to_next, n_left_to_next,
132 bi0, bi1, next0, next1);
136 while (n_left_from > 0 && n_left_to_next > 0)
140 u32 next0 = DNS46_REPLY_NEXT_DROP;
146 /* speculatively enqueue b0 to the current next frame */
155 b0 = vlib_get_buffer (vm, bi0);
156 d0 = vlib_buffer_get_current (b0);
158 pool_index0 = clib_host_to_net_u16 (d0->id);
161 vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1);
162 clib_memcpy (resp0, d0, vlib_buffer_length_in_chain (vm, b0));
165 * Deal with everything in process ctx on the main thread
167 vlib_process_signal_event_mt (vm, dns_resolver_node.index,
168 DNS_RESOLVER_EVENT_RESOLVED,
170 error0 = DNS46_REPLY_ERROR_PROCESSED;
172 b0->error = node->errors[error0];
174 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
175 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
177 dns46_reply_trace_t *t =
178 vlib_add_trace (vm, node, b0, sizeof (*t));
179 t->disposition = error0;
180 t->pool_index = pool_index0;
183 /* verify speculative enqueue, maybe switch current next frame */
184 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
185 to_next, n_left_to_next,
189 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
192 return frame->n_vectors;
195 VLIB_REGISTER_NODE (dns46_reply_node) =
197 .function = dns46_reply_node_fn,.name = "dns46_reply",.vector_size =
198 sizeof (u32),.format_trace = format_dns46_reply_trace,.type =
199 VLIB_NODE_TYPE_INTERNAL,.n_errors =
200 ARRAY_LEN (dns46_reply_error_strings),.error_strings =
201 dns46_reply_error_strings,.n_next_nodes = DNS46_REPLY_N_NEXT,
202 /* edit / add dispositions here */
205 [DNS46_REPLY_NEXT_DROP] = "error-drop",}
209 * fd.io coding-style-patch-verification: ON
212 * eval: (c-set-style "gnu")