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>
37 /* Next nodes for features and output interfaces */
38 l2_output_next_nodes_st next_nodes;
40 /* convenience variables */
41 vlib_main_t *vlib_main;
42 vnet_main_t *vnet_main;
49 /* per-pkt trace data */
56 /* packet trace format function */
58 format_l2_outacl_trace (u8 * s, va_list * args)
60 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62 l2_outacl_trace_t *t = va_arg (*args, l2_outacl_trace_t *);
64 s = format (s, "l2-output-acl: sw_if_index %d dst %U src %U",
66 format_ethernet_address, t->dst,
67 format_ethernet_address, t->src);
71 l2_outacl_main_t l2_outacl_main;
73 static vlib_node_registration_t l2_outacl_node;
75 #define foreach_l2_outacl_error \
76 _(L2_OUTACL, "L2 output ACL packets") \
77 _(DROP, "L2 output drops")
81 #define _(sym,str) L2_OUTACL_ERROR_##sym,
82 foreach_l2_outacl_error
87 static char *l2_outacl_error_strings[] = {
88 #define _(sym,string) string,
89 foreach_l2_outacl_error
102 l2_outacl_node_fn (vlib_main_t * vm,
103 vlib_node_runtime_t * node, vlib_frame_t * frame)
105 u32 n_left_from, *from, *to_next;
106 l2_outacl_next_t next_index;
107 l2_outacl_main_t *msm = &l2_outacl_main;
108 vlib_node_t *n = vlib_get_node (vm, l2_outacl_node.index);
109 u32 node_counter_base_index = n->error_heap_index;
110 vlib_error_main_t *em = &vm->error_main;
111 u32 cached_sw_if_index = (u32) ~ 0;
112 u32 cached_next_index = (u32) ~ 0;
114 from = vlib_frame_vector_args (frame);
115 n_left_from = frame->n_vectors; /* number of packets to process */
116 next_index = node->cached_next_index;
118 while (n_left_from > 0)
122 /* get space to enqueue frame to graph node "next_index" */
123 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
125 while (0 && n_left_from >= 4 && n_left_to_next >= 2)
128 vlib_buffer_t *b0, *b1;
130 u32 sw_if_index0, sw_if_index1;
131 ethernet_header_t *h0, *h1;
133 /* Prefetch next iteration. */
135 vlib_buffer_t *p2, *p3;
137 p2 = vlib_get_buffer (vm, from[2]);
138 p3 = vlib_get_buffer (vm, from[3]);
140 vlib_prefetch_buffer_header (p2, LOAD);
141 vlib_prefetch_buffer_header (p3, LOAD);
143 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
144 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
147 /* speculatively enqueue b0 and b1 to the current next frame */
148 /* bi is "buffer index", b is pointer to the buffer */
149 to_next[0] = bi0 = from[0];
150 to_next[1] = bi1 = from[1];
156 b0 = vlib_get_buffer (vm, bi0);
157 b1 = vlib_get_buffer (vm, bi1);
159 /* TX interface handles */
160 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
161 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
163 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
165 if (b0->flags & VLIB_BUFFER_IS_TRACED)
167 l2_outacl_trace_t *t =
168 vlib_add_trace (vm, node, b0, sizeof (*t));
169 t->sw_if_index = sw_if_index0;
170 t->next_index = next0;
171 clib_memcpy (t->src, h0->src_address, 6);
172 clib_memcpy (t->dst, h0->dst_address, 6);
174 if (b1->flags & VLIB_BUFFER_IS_TRACED)
176 l2_outacl_trace_t *t =
177 vlib_add_trace (vm, node, b1, sizeof (*t));
178 t->sw_if_index = sw_if_index1;
179 t->next_index = next1;
180 clib_memcpy (t->src, h1->src_address, 6);
181 clib_memcpy (t->dst, h1->dst_address, 6);
185 em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
188 /* add core loop code here */
190 /* verify speculative enqueues, maybe switch current next frame */
191 /* if next0==next1==next_index then nothing special needs to be done */
192 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
193 to_next, n_left_to_next,
194 bi0, bi1, next0, next1);
197 while (n_left_from > 0 && n_left_to_next > 0)
203 ethernet_header_t *h0;
206 /* speculatively enqueue b0 to the current next frame */
214 b0 = vlib_get_buffer (vm, bi0);
215 h0 = vlib_buffer_get_current (b0);
217 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
219 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
220 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
222 l2_outacl_trace_t *t =
223 vlib_add_trace (vm, node, b0, sizeof (*t));
224 t->sw_if_index = sw_if_index0;
225 clib_memcpy (t->src, h0->src_address, 6);
226 clib_memcpy (t->dst, h0->dst_address, 6);
229 em->counters[node_counter_base_index + L2_OUTACL_ERROR_L2_OUTACL] +=
234 * Dummy for now, just go to next feature node
238 /* Remove ourself from the feature bitmap */
240 vnet_buffer (b0)->l2.feature_bitmap & ~L2OUTPUT_FEAT_ACL;
242 /* Determine next node */
243 l2_output_dispatch (msm->vlib_main,
246 l2_outacl_node.index,
250 b0, sw_if_index0, feature_bitmap0, &next0);
252 /* verify speculative enqueue, maybe switch current next frame */
253 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
254 to_next, n_left_to_next,
258 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
261 return frame->n_vectors;
266 VLIB_REGISTER_NODE (l2_outacl_node,static) = {
267 .function = l2_outacl_node_fn,
268 .name = "l2-output-acl",
269 .vector_size = sizeof (u32),
270 .format_trace = format_l2_outacl_trace,
271 .type = VLIB_NODE_TYPE_INTERNAL,
273 .n_errors = ARRAY_LEN(l2_outacl_error_strings),
274 .error_strings = l2_outacl_error_strings,
276 .n_next_nodes = L2_OUTACL_N_NEXT,
278 /* edit / add dispositions here */
280 [L2_OUTACL_NEXT_DROP] = "error-drop",
285 VLIB_NODE_FUNCTION_MULTIARCH (l2_outacl_node, l2_outacl_node_fn)
286 clib_error_t *l2_outacl_init (vlib_main_t * vm)
288 l2_outacl_main_t *mp = &l2_outacl_main;
291 mp->vnet_main = vnet_get_main ();
293 /* Initialize the feature next-node indexes */
294 feat_bitmap_init_next_nodes (vm,
295 l2_outacl_node.index,
297 l2output_get_feat_names (),
298 mp->next_nodes.feat_next_node_index);
300 /* Initialize the output node mapping table */
301 l2output_init_output_node_vec (&mp->next_nodes.output_node_index_vec);
306 VLIB_INIT_FUNCTION (l2_outacl_init);
309 /** @todo maybe someone will add output ACL's in the future.
310 * Set subinterface outacl enable/disable.
312 * set interface acl output <interface> [disable]
314 static clib_error_t *
315 int_l2_outacl (vlib_main_t * vm,
316 unformat_input_t * input, vlib_cli_command_t * cmd)
318 vnet_main_t *vnm = vnet_get_main ();
319 clib_error_t *error = 0;
323 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
325 error = clib_error_return (0, "unknown interface `%U'",
326 format_unformat_error, input);
331 if (unformat (input, "disable"))
336 /* set the interface flag */
337 l2output_intf_bitmap_enable (sw_if_index, L2OUTPUT_FEAT_ACL, enable);
344 VLIB_CLI_COMMAND (int_l2_outacl_cli, static) = {
345 .path = "set interface acl output",
346 .short_help = "set interface acl output <interface> [disable]",
347 .function = int_l2_outacl,
353 * fd.io coding-style-patch-verification: ON
356 * eval: (c-set-style "gnu")