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 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 vlib_node_registration_t li_hit_node;
47 #define foreach_li_hit_error \
48 _(HITS, "LI packets processed") \
49 _(NO_COLLECTOR, "No collector configured") \
50 _(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure")
54 #define _(sym,str) LI_HIT_ERROR_##sym,
60 static char *li_hit_error_strings[] = {
61 #define _(sym,string) string,
73 li_hit_node_fn (vlib_main_t * vm,
74 vlib_node_runtime_t * node, vlib_frame_t * frame)
76 u32 n_left_from, *from, *to_next;
77 li_hit_next_t next_index;
78 vlib_frame_t *int_frame = 0;
80 li_main_t *lm = &li_main;
82 from = vlib_frame_vector_args (frame);
83 n_left_from = frame->n_vectors;
84 next_index = node->cached_next_index;
86 if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
88 vlib_node_increment_counter (vm, li_hit_node.index,
89 LI_HIT_ERROR_NO_COLLECTOR, n_left_from);
93 /* The intercept frame... */
94 int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
95 to_int_next = vlib_frame_vector_args (int_frame);
98 while (n_left_from > 0)
102 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
105 while (n_left_from >= 4 && n_left_to_next >= 2)
107 u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
108 u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
109 u32 sw_if_index0, sw_if_index1;
111 ethernet_header_t *en0, *en1;
113 vlib_buffer_t *b0, *b1;
115 /* Prefetch next iteration. */
117 vlib_buffer_t *p2, *p3;
119 p2 = vlib_get_buffer (vm, from[2]);
120 p3 = vlib_get_buffer (vm, from[3]);
122 vlib_prefetch_buffer_header (p2, LOAD);
123 vlib_prefetch_buffer_header (p3, LOAD);
125 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
126 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
129 /* speculatively enqueue b0 and b1 to the current next frame */
130 to_next[0] = bi0 = from[0];
131 to_next[1] = bi1 = from[1];
137 b0 = vlib_get_buffer (vm, bi0);
138 b1 = vlib_get_buffer (vm, bi1);
140 /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
141 ASSERT (b0->current_data == 0);
142 ASSERT (b1->current_data == 0);
144 en0 = vlib_buffer_get_current (b0);
145 en1 = vlib_buffer_get_current (b1);
147 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
148 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
150 /* Send pkt back out the RX interface */
151 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
152 vnet_buffer (b1)->sw_if_index[VLIB_TX] = sw_if_index1;
154 /* $$$$$ End of processing 2 x packets $$$$$ */
156 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
158 if (b0->flags & VLIB_BUFFER_IS_TRACED)
161 vlib_add_trace (vm, node, b0, sizeof (*t));
162 t->sw_if_index = sw_if_index0;
163 t->next_index = next0;
165 if (b1->flags & VLIB_BUFFER_IS_TRACED)
168 vlib_add_trace (vm, node, b1, sizeof (*t));
169 t->sw_if_index = sw_if_index1;
170 t->next_index = next1;
174 /* verify speculative enqueues, maybe switch current next frame */
175 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
176 to_next, n_left_to_next,
177 bi0, bi1, next0, next1);
179 #endif /* $$$ dual-loop off */
181 while (n_left_from > 0 && n_left_to_next > 0)
186 ip4_udp_header_t *iu0;
189 u32 next0 = LI_HIT_NEXT_ETHERNET;
191 /* speculatively enqueue b0 to the current next frame */
199 b0 = vlib_get_buffer (vm, bi0);
200 if (PREDICT_TRUE (to_int_next != 0))
202 /* Make an intercept copy. This can fail. */
203 c0 = vlib_buffer_copy (vm, b0);
205 if (PREDICT_FALSE (c0 == 0))
207 vlib_node_increment_counter
208 (vm, node->node_index,
209 LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1);
213 vlib_buffer_advance (c0, -sizeof (*iu0));
215 iu0 = vlib_buffer_get_current (c0);
218 ip0->ip_version_and_header_length = 0x45;
220 ip0->protocol = IP_PROTOCOL_UDP;
222 ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
223 ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
224 ip0->length = vlib_buffer_length_in_chain (vm, c0);
225 ip0->checksum = ip4_header_checksum (ip0);
228 udp0->src_port = udp0->dst_port =
229 clib_host_to_net_u16 (lm->ports[0]);
232 clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, b0));
234 to_int_next[0] = vlib_get_buffer_index (vm, c0);
239 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
240 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
242 li_hit_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
243 t->next_index = next0;
246 /* verify speculative enqueue, maybe switch current next frame */
247 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
248 to_next, n_left_to_next,
252 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
257 int_frame->n_vectors = frame->n_vectors;
258 vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
261 vlib_node_increment_counter (vm, li_hit_node.index,
262 LI_HIT_ERROR_HITS, frame->n_vectors);
263 return frame->n_vectors;
267 VLIB_REGISTER_NODE (li_hit_node) = {
268 .function = li_hit_node_fn,
270 .vector_size = sizeof (u32),
271 .format_trace = format_li_hit_trace,
272 .type = VLIB_NODE_TYPE_INTERNAL,
274 .n_errors = ARRAY_LEN(li_hit_error_strings),
275 .error_strings = li_hit_error_strings,
277 .n_next_nodes = LI_HIT_N_NEXT,
279 /* edit / add dispositions here */
281 [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
286 VLIB_NODE_FUNCTION_MULTIARCH (li_hit_node, li_hit_node_fn)
288 * fd.io coding-style-patch-verification: ON
291 * eval: (c-set-style "gnu")