2 * Copyright (c) 2015 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 <vlib/vlib.h>
17 #include <vnet/vnet.h>
18 #include <vppinfra/error.h>
20 #include <vnet/lawful-intercept/lawful_intercept.h>
22 #include <vppinfra/error.h>
23 #include <vppinfra/elog.h>
25 extern vlib_node_registration_t li_hit_node;
32 /* packet trace format function */
34 format_li_hit_trace (u8 * s, va_list * args)
36 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38 li_hit_trace_t *t = va_arg (*args, li_hit_trace_t *);
40 s = format (s, "LI_HIT: next index %d", t->next_index);
45 #define foreach_li_hit_error \
46 _(HITS, "LI packets processed") \
47 _(NO_COLLECTOR, "No collector configured") \
48 _(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure")
52 #define _(sym,str) LI_HIT_ERROR_##sym,
58 static char *li_hit_error_strings[] = {
59 #define _(sym,string) string,
70 VLIB_NODE_FN (li_hit_node) (vlib_main_t * vm,
71 vlib_node_runtime_t * node, vlib_frame_t * frame)
73 u32 n_left_from, *from, *to_next;
74 li_hit_next_t next_index;
75 vlib_frame_t *int_frame = 0;
77 li_main_t *lm = &li_main;
79 from = vlib_frame_vector_args (frame);
80 n_left_from = frame->n_vectors;
81 next_index = node->cached_next_index;
83 if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
85 vlib_node_increment_counter (vm, li_hit_node.index,
86 LI_HIT_ERROR_NO_COLLECTOR, n_left_from);
90 /* The intercept frame... */
91 int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
92 to_int_next = vlib_frame_vector_args (int_frame);
95 while (n_left_from > 0)
99 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
102 while (n_left_from >= 4 && n_left_to_next >= 2)
104 u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
105 u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
106 u32 sw_if_index0, sw_if_index1;
108 ethernet_header_t *en0, *en1;
110 vlib_buffer_t *b0, *b1;
112 /* Prefetch next iteration. */
114 vlib_buffer_t *p2, *p3;
116 p2 = vlib_get_buffer (vm, from[2]);
117 p3 = vlib_get_buffer (vm, from[3]);
119 vlib_prefetch_buffer_header (p2, LOAD);
120 vlib_prefetch_buffer_header (p3, LOAD);
122 clib_prefetch_store (p2->data);
123 clib_prefetch_store (p3->data);
126 /* speculatively enqueue b0 and b1 to the current next frame */
127 to_next[0] = bi0 = from[0];
128 to_next[1] = bi1 = from[1];
134 b0 = vlib_get_buffer (vm, bi0);
135 b1 = vlib_get_buffer (vm, bi1);
137 /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
138 ASSERT (b0->current_data == 0);
139 ASSERT (b1->current_data == 0);
141 en0 = vlib_buffer_get_current (b0);
142 en1 = vlib_buffer_get_current (b1);
144 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
145 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
147 /* Send pkt back out the RX interface */
148 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
149 vnet_buffer (b1)->sw_if_index[VLIB_TX] = sw_if_index1;
151 /* $$$$$ End of processing 2 x packets $$$$$ */
153 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
155 if (b0->flags & VLIB_BUFFER_IS_TRACED)
158 vlib_add_trace (vm, node, b0, sizeof (*t));
159 t->sw_if_index = sw_if_index0;
160 t->next_index = next0;
162 if (b1->flags & VLIB_BUFFER_IS_TRACED)
165 vlib_add_trace (vm, node, b1, sizeof (*t));
166 t->sw_if_index = sw_if_index1;
167 t->next_index = next1;
171 /* verify speculative enqueues, maybe switch current next frame */
172 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
173 to_next, n_left_to_next,
174 bi0, bi1, next0, next1);
176 #endif /* $$$ dual-loop off */
178 while (n_left_from > 0 && n_left_to_next > 0)
183 ip4_udp_header_t *iu0;
186 u32 next0 = LI_HIT_NEXT_ETHERNET;
188 /* speculatively enqueue b0 to the current next frame */
196 b0 = vlib_get_buffer (vm, bi0);
197 if (PREDICT_TRUE (to_int_next != 0))
199 /* Make an intercept copy. This can fail. */
200 c0 = vlib_buffer_copy (vm, b0);
202 if (PREDICT_FALSE (c0 == 0))
204 vlib_node_increment_counter
205 (vm, node->node_index,
206 LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1);
210 vlib_buffer_advance (c0, -sizeof (*iu0));
212 iu0 = vlib_buffer_get_current (c0);
215 ip0->ip_version_and_header_length = 0x45;
217 ip0->protocol = IP_PROTOCOL_UDP;
219 ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
220 ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
221 ip0->length = vlib_buffer_length_in_chain (vm, c0);
222 ip0->checksum = ip4_header_checksum (ip0);
225 udp0->src_port = udp0->dst_port =
226 clib_host_to_net_u16 (lm->ports[0]);
229 clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, b0));
231 to_int_next[0] = vlib_get_buffer_index (vm, c0);
236 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
237 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
239 li_hit_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
240 t->next_index = next0;
243 /* verify speculative enqueue, maybe switch current next frame */
244 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
245 to_next, n_left_to_next,
249 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
254 int_frame->n_vectors = frame->n_vectors;
255 vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
258 vlib_node_increment_counter (vm, li_hit_node.index,
259 LI_HIT_ERROR_HITS, frame->n_vectors);
260 return frame->n_vectors;
263 VLIB_REGISTER_NODE (li_hit_node) = {
265 .vector_size = sizeof (u32),
266 .format_trace = format_li_hit_trace,
267 .type = VLIB_NODE_TYPE_INTERNAL,
269 .n_errors = ARRAY_LEN(li_hit_error_strings),
270 .error_strings = li_hit_error_strings,
272 .n_next_nodes = LI_HIT_N_NEXT,
274 /* edit / add dispositions here */
276 [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
281 * fd.io coding-style-patch-verification: ON
284 * eval: (c-set-style "gnu")