2 * Copyright (c) 2016 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 <vnet/vnet.h>
17 #include <vnet/adj/adj_l2.h>
18 #include <vnet/ethernet/ethernet.h>
19 #include <vnet/ip/ip.h>
22 * @brief Trace data for a L2 Midchain
24 typedef struct adj_l2_trace_t_ {
25 /** Adjacency index taken. */
30 format_adj_l2_trace (u8 * s, va_list * args)
32 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
33 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
34 adj_l2_trace_t * t = va_arg (*args, adj_l2_trace_t *);
36 s = format (s, "adj-idx %d : %U",
38 format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE);
42 typedef enum adj_l2_rewrite_next_t_
44 ADJ_L2_REWRITE_NEXT_DROP,
45 } adj_l2_rewrite_next_t;
48 adj_l2_rewrite_inline (vlib_main_t * vm,
49 vlib_node_runtime_t * node,
53 u32 * from = vlib_frame_vector_args (frame);
54 u32 n_left_from, n_left_to_next, * to_next, next_index;
55 u32 thread_index = vlib_get_thread_index();
56 ethernet_main_t * em = ðernet_main;
58 n_left_from = frame->n_vectors;
59 next_index = node->cached_next_index;
61 while (n_left_from > 0)
63 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
65 while (n_left_from > 0 && n_left_to_next > 0)
67 ip_adjacency_t * adj0;
70 u32 pi0, rw_len0, adj_index0, next0 = 0;
73 pi0 = to_next[0] = from[0];
79 p0 = vlib_get_buffer (vm, pi0);
80 h0 = vlib_buffer_get_current (p0);
82 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
84 adj0 = adj_get (adj_index0);
86 /* Guess we are only writing on simple Ethernet header. */
87 vnet_rewrite_one_header (adj0[0], h0,
88 sizeof (ethernet_header_t));
90 /* Update packet buffer attributes/set output interface. */
91 rw_len0 = adj0[0].rewrite_header.data_bytes;
92 vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
93 vnet_buffer(p0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
94 /* since we are coming out of the L2 world, where the vlib_buffer
95 * union is used for other things, make sure it is clean for
98 vnet_buffer(p0)->mpls.first = 0;
100 vlib_increment_combined_counter(&adjacency_counters,
103 /* packet increment */ 0,
104 /* byte increment */ rw_len0);
106 /* Check MTU of outgoing interface. */
107 if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <=
108 adj0[0].rewrite_header.max_l3_packet_bytes)))
110 /* Don't adjust the buffer for ttl issue; icmp-error node wants
111 * to see the IP header */
112 p0->current_data -= rw_len0;
113 p0->current_length += rw_len0;
114 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
118 adj0->sub_type.midchain.fixup_func(
120 adj0->sub_type.midchain.fixup_data);
123 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
126 * Follow the feature ARC. this will result eventually in
127 * the midchain-tx node
129 vnet_feature_arc_start(em->output_feature_arc_index, tx_sw_if_index0, &next0, p0);
133 /* can't fragment L2 */
134 next0 = ADJ_L2_REWRITE_NEXT_DROP;
137 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
139 adj_l2_trace_t *tr = vlib_add_trace (vm, node,
141 tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
144 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
145 to_next, n_left_to_next,
149 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
152 return frame->n_vectors;
155 VLIB_NODE_FN (adj_l2_rewrite_node) (vlib_main_t * vm,
156 vlib_node_runtime_t * node,
157 vlib_frame_t * frame)
159 return adj_l2_rewrite_inline (vm, node, frame, 0);
162 VLIB_NODE_FN (adj_l2_midchain_node) (vlib_main_t * vm,
163 vlib_node_runtime_t * node,
164 vlib_frame_t * frame)
166 return adj_l2_rewrite_inline (vm, node, frame, 1);
169 VLIB_REGISTER_NODE (adj_l2_rewrite_node) = {
170 .name = "adj-l2-rewrite",
171 .vector_size = sizeof (u32),
173 .format_trace = format_adj_l2_trace,
177 [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",
181 VLIB_REGISTER_NODE (adj_l2_midchain_node) = {
182 .name = "adj-l2-midchain",
183 .vector_size = sizeof (u32),
185 .format_trace = format_adj_l2_trace,
189 [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",