Line data Source code
1 : /*
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:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
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.
14 : */
15 :
16 : #include <dns/dns.h>
17 :
18 : #include <vlib/vlib.h>
19 : #include <vnet/vnet.h>
20 :
21 : vlib_node_registration_t dns46_reply_node;
22 :
23 : typedef struct
24 : {
25 : u32 pool_index;
26 : u32 disposition;
27 : } dns46_reply_trace_t;
28 :
29 : /* packet trace format function */
30 : static u8 *
31 0 : format_dns46_reply_trace (u8 * s, va_list * args)
32 : {
33 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
34 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
35 0 : dns46_reply_trace_t *t = va_arg (*args, dns46_reply_trace_t *);
36 :
37 0 : s = format (s, "DNS46_REPLY: pool index %d, disposition %d",
38 : t->pool_index, t->disposition);
39 0 : return s;
40 : }
41 :
42 : vlib_node_registration_t dns46_reply_node;
43 :
44 : static char *dns46_reply_error_strings[] = {
45 : #define _(sym,string) string,
46 : foreach_dns46_reply_error
47 : #undef _
48 : };
49 :
50 : typedef enum
51 : {
52 : DNS46_REPLY_NEXT_DROP,
53 : DNS46_REPLY_NEXT_PUNT,
54 : DNS46_REPLY_N_NEXT,
55 : } dns46_reply_next_t;
56 :
57 : static uword
58 0 : dns46_reply_node_fn (vlib_main_t * vm,
59 : vlib_node_runtime_t * node, vlib_frame_t * frame)
60 : {
61 : u32 n_left_from, *from, *to_next;
62 : dns46_reply_next_t next_index;
63 0 : dns_main_t *dm = &dns_main;
64 :
65 0 : from = vlib_frame_vector_args (frame);
66 0 : n_left_from = frame->n_vectors;
67 0 : next_index = node->cached_next_index;
68 :
69 0 : while (n_left_from > 0)
70 : {
71 : u32 n_left_to_next;
72 :
73 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
74 :
75 : #if 0
76 : while (n_left_from >= 4 && n_left_to_next >= 2)
77 : {
78 : u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
79 : u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
80 : u32 sw_if_index0, sw_if_index1;
81 : u8 tmp0[6], tmp1[6];
82 : ethernet_header_t *en0, *en1;
83 : u32 bi0, bi1;
84 : vlib_buffer_t *b0, *b1;
85 :
86 : /* Prefetch next iteration. */
87 : {
88 : vlib_buffer_t *p2, *p3;
89 :
90 : p2 = vlib_get_buffer (vm, from[2]);
91 : p3 = vlib_get_buffer (vm, from[3]);
92 :
93 : vlib_prefetch_buffer_header (p2, LOAD);
94 : vlib_prefetch_buffer_header (p3, LOAD);
95 :
96 : clib_prefetch_store (p2->data);
97 : clib_prefetch_store (p3->data);
98 : }
99 :
100 : /* speculatively enqueue b0 and b1 to the current next frame */
101 : to_next[0] = bi0 = from[0];
102 : to_next[1] = bi1 = from[1];
103 : from += 2;
104 : to_next += 2;
105 : n_left_from -= 2;
106 : n_left_to_next -= 2;
107 :
108 : b0 = vlib_get_buffer (vm, bi0);
109 : b1 = vlib_get_buffer (vm, bi1);
110 :
111 : /* $$$$$ End of processing 2 x packets $$$$$ */
112 :
113 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
114 : {
115 : if (b0->flags & VLIB_BUFFER_IS_TRACED)
116 : {
117 : dns46_reply_trace_t *t =
118 : vlib_add_trace (vm, node, b0, sizeof (*t));
119 : t->sw_if_index = sw_if_index0;
120 : t->next_index = next0;
121 : }
122 : if (b1->flags & VLIB_BUFFER_IS_TRACED)
123 : {
124 : dns46_reply_trace_t *t =
125 : vlib_add_trace (vm, node, b1, sizeof (*t));
126 : t->sw_if_index = sw_if_index1;
127 : t->next_index = next1;
128 : }
129 : }
130 :
131 : /* verify speculative enqueues, maybe switch current next frame */
132 : vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
133 : to_next, n_left_to_next,
134 : bi0, bi1, next0, next1);
135 : }
136 : #endif
137 :
138 0 : while (n_left_from > 0 && n_left_to_next > 0)
139 : {
140 : u32 bi0;
141 : vlib_buffer_t *b0;
142 0 : u32 next0 = DNS46_REPLY_NEXT_DROP;
143 : dns_header_t *d0;
144 0 : u32 pool_index0 = ~0;
145 0 : u32 error0 = 0;
146 0 : u8 *resp0 = 0;
147 :
148 : /* speculatively enqueue b0 to the current next frame */
149 0 : bi0 = from[0];
150 0 : to_next[0] = bi0;
151 0 : from += 1;
152 0 : to_next += 1;
153 0 : n_left_from -= 1;
154 0 : n_left_to_next -= 1;
155 :
156 0 : b0 = vlib_get_buffer (vm, bi0);
157 0 : d0 = vlib_buffer_get_current (b0);
158 0 : if (PREDICT_FALSE (dm->is_enabled == 0))
159 : {
160 0 : next0 = DNS46_REPLY_NEXT_PUNT;
161 0 : error0 = DNS46_REPLY_ERROR_DISABLED;
162 0 : goto done0;
163 : }
164 :
165 0 : pool_index0 = clib_host_to_net_u16 (d0->id);
166 :
167 : /* Save the reply */
168 0 : vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1);
169 0 : clib_memcpy_fast (resp0, d0, vlib_buffer_length_in_chain (vm, b0));
170 :
171 : /*
172 : * Deal with everything in process ctx on the main thread
173 : */
174 0 : vlib_process_signal_event_mt (vm, dm->resolver_process_node_index,
175 : DNS_RESOLVER_EVENT_RESOLVED,
176 : (uword) resp0);
177 0 : error0 = DNS46_REPLY_ERROR_PROCESSED;
178 :
179 0 : done0:
180 0 : b0->error = node->errors[error0];
181 :
182 0 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
183 : && (b0->flags & VLIB_BUFFER_IS_TRACED)))
184 : {
185 : dns46_reply_trace_t *t =
186 0 : vlib_add_trace (vm, node, b0, sizeof (*t));
187 0 : t->disposition = error0;
188 0 : t->pool_index = pool_index0;
189 : }
190 :
191 : /* verify speculative enqueue, maybe switch current next frame */
192 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
193 : to_next, n_left_to_next,
194 : bi0, next0);
195 : }
196 :
197 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
198 : }
199 :
200 0 : return frame->n_vectors;
201 : }
202 :
203 : /* *INDENT-OFF* */
204 146760 : VLIB_REGISTER_NODE (dns46_reply_node) =
205 : {
206 : .function = dns46_reply_node_fn,
207 : .name = "dns46_reply",
208 : .vector_size = sizeof (u32),
209 : .format_trace = format_dns46_reply_trace,
210 : .type = VLIB_NODE_TYPE_INTERNAL,
211 : .n_errors = ARRAY_LEN (dns46_reply_error_strings),
212 : .error_strings = dns46_reply_error_strings,
213 : .n_next_nodes = DNS46_REPLY_N_NEXT,
214 : .next_nodes = {
215 : [DNS46_REPLY_NEXT_DROP] = "error-drop",
216 : [DNS46_REPLY_NEXT_PUNT] = "error-punt",
217 : },
218 : };
219 : /* *INDENT-ON* */
220 :
221 : /*
222 : * fd.io coding-style-patch-verification: ON
223 : *
224 : * Local Variables:
225 : * eval: (c-set-style "gnu")
226 : * End:
227 : */
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