2 * l2_output_acl.c : layer 2 output acl processing
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/vnet.h>
20 #include <vnet/pg/pg.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/ethernet/packet.h>
23 #include <vnet/ip/ip_packet.h>
24 #include <vnet/ip/ip4_packet.h>
25 #include <vnet/ip/ip6_packet.h>
27 #include <vnet/l2/feat_bitmap.h>
28 #include <vnet/l2/l2_output.h>
30 #include <vppinfra/error.h>
31 #include <vppinfra/hash.h>
32 #include <vppinfra/cache.h>
36 // Next nodes for features and output interfaces
37 l2_output_next_nodes_st next_nodes;
39 /* convenience variables */
40 vlib_main_t * vlib_main;
41 vnet_main_t * vnet_main;
47 /* per-pkt trace data */
54 /* packet trace format function */
55 static u8 * format_l2_outacl_trace (u8 * s, va_list * args)
57 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
58 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
59 l2_outacl_trace_t * t = va_arg (*args, l2_outacl_trace_t *);
61 s = format (s, "l2-output-acl: sw_if_index %d dst %U src %U",
63 format_ethernet_address, t->dst,
64 format_ethernet_address, t->src);
68 l2_outacl_main_t l2_outacl_main;
70 static vlib_node_registration_t l2_outacl_node;
72 #define foreach_l2_outacl_error \
73 _(L2_OUTACL, "L2 output ACL packets") \
74 _(DROP, "L2 output drops")
77 #define _(sym,str) L2_OUTACL_ERROR_##sym,
78 foreach_l2_outacl_error
83 static char * l2_outacl_error_strings[] = {
84 #define _(sym,string) string,
85 foreach_l2_outacl_error
97 l2_outacl_node_fn (vlib_main_t * vm,
98 vlib_node_runtime_t * node,
101 u32 n_left_from, * from, * to_next;
102 l2_outacl_next_t next_index;
103 l2_outacl_main_t * msm = &l2_outacl_main;
104 vlib_node_t *n = vlib_get_node (vm, l2_outacl_node.index);
105 u32 node_counter_base_index = n->error_heap_index;
106 vlib_error_main_t * em = &vm->error_main;
107 u32 cached_sw_if_index = (u32)~0;
108 u32 cached_next_index = (u32)~0;
110 from = vlib_frame_vector_args (frame);
111 n_left_from = frame->n_vectors; /* number of packets to process */
112 next_index = node->cached_next_index;
114 while (n_left_from > 0)
118 /* get space to enqueue frame to graph node "next_index" */
119 vlib_get_next_frame (vm, node, next_index,
120 to_next, n_left_to_next);
122 while (0 && n_left_from >= 4 && n_left_to_next >= 2)
125 vlib_buffer_t * b0, * b1;
127 u32 sw_if_index0, sw_if_index1;
128 ethernet_header_t * h0, * h1;
130 /* Prefetch next iteration. */
132 vlib_buffer_t * p2, * p3;
134 p2 = vlib_get_buffer (vm, from[2]);
135 p3 = vlib_get_buffer (vm, from[3]);
137 vlib_prefetch_buffer_header (p2, LOAD);
138 vlib_prefetch_buffer_header (p3, LOAD);
140 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
141 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
144 /* speculatively enqueue b0 and b1 to the current next frame */
145 /* bi is "buffer index", b is pointer to the buffer */
146 to_next[0] = bi0 = from[0];
147 to_next[1] = bi1 = from[1];
153 b0 = vlib_get_buffer (vm, bi0);
154 b1 = vlib_get_buffer (vm, bi1);
156 /* TX interface handles */
157 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
158 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
160 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
162 if (b0->flags & VLIB_BUFFER_IS_TRACED)
164 l2_outacl_trace_t *t =
165 vlib_add_trace (vm, node, b0, sizeof (*t));
166 t->sw_if_index = sw_if_index0;
167 t->next_index = next0;
168 memcpy(t->src, h0->src_address, 6);
169 memcpy(t->dst, h0->dst_address, 6);
171 if (b1->flags & VLIB_BUFFER_IS_TRACED)
173 l2_outacl_trace_t *t =
174 vlib_add_trace (vm, node, b1, sizeof (*t));
175 t->sw_if_index = sw_if_index1;
176 t->next_index = next1;
177 memcpy(t->src, h1->src_address, 6);
178 memcpy(t->dst, h1->dst_address, 6);
182 em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] += 2;
184 /* add core loop code here */
186 /* verify speculative enqueues, maybe switch current next frame */
187 /* if next0==next1==next_index then nothing special needs to be done */
188 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
189 to_next, n_left_to_next,
190 bi0, bi1, next0, next1);
193 while (n_left_from > 0 && n_left_to_next > 0)
199 ethernet_header_t * h0;
202 /* speculatively enqueue b0 to the current next frame */
210 b0 = vlib_get_buffer (vm, bi0);
211 h0 = vlib_buffer_get_current (b0);
213 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
215 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
216 && (b0->flags & VLIB_BUFFER_IS_TRACED))) {
217 l2_outacl_trace_t *t =
218 vlib_add_trace (vm, node, b0, sizeof (*t));
219 t->sw_if_index = sw_if_index0;
220 memcpy(t->src, h0->src_address, 6);
221 memcpy(t->dst, h0->dst_address, 6);
224 em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] += 1;
227 // Dummy for now, just go to next feature node
230 // Remove ourself from the feature bitmap
231 feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2OUTPUT_FEAT_ACL;
233 // Determine next node
234 l2_output_dispatch (msm->vlib_main,
237 l2_outacl_node.index,
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);
255 return frame->n_vectors;
259 VLIB_REGISTER_NODE (l2_outacl_node,static) = {
260 .function = l2_outacl_node_fn,
261 .name = "l2-output-acl",
262 .vector_size = sizeof (u32),
263 .format_trace = format_l2_outacl_trace,
264 .type = VLIB_NODE_TYPE_INTERNAL,
266 .n_errors = ARRAY_LEN(l2_outacl_error_strings),
267 .error_strings = l2_outacl_error_strings,
269 .n_next_nodes = L2_OUTACL_N_NEXT,
271 /* edit / add dispositions here */
273 [L2_OUTACL_NEXT_DROP] = "error-drop",
277 clib_error_t *l2_outacl_init (vlib_main_t *vm)
279 l2_outacl_main_t * mp = &l2_outacl_main;
282 mp->vnet_main = vnet_get_main();
284 // Initialize the feature next-node indexes
285 feat_bitmap_init_next_nodes(vm,
286 l2_outacl_node.index,
288 l2output_get_feat_names(),
289 mp->next_nodes.feat_next_node_index);
291 // Initialize the output node mapping table
292 l2output_init_output_node_vec(&mp->next_nodes.output_node_index_vec);
297 VLIB_INIT_FUNCTION (l2_outacl_init);
299 // set subinterface outacl enable/disable
300 // The CLI format is:
301 // set interface acl output <interface> [disable]
302 static clib_error_t *
303 int_l2_outacl (vlib_main_t * vm,
304 unformat_input_t * input,
305 vlib_cli_command_t * cmd)
307 vnet_main_t * vnm = vnet_get_main();
308 clib_error_t * error = 0;
312 if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
314 error = clib_error_return (0, "unknown interface `%U'",
315 format_unformat_error, input);
320 if (unformat (input, "disable")) {
324 // set the interface flag
325 l2output_intf_bitmap_enable(sw_if_index, L2OUTPUT_FEAT_ACL, enable);
331 VLIB_CLI_COMMAND (int_l2_outacl_cli, static) = {
332 .path = "set interface acl output",
333 .short_help = "set interface acl output <interface> [disable]",
334 .function = int_l2_outacl,