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,
54 u32 * from = vlib_frame_vector_args (frame);
55 u32 n_left_from, n_left_to_next, * to_next, next_index;
56 u32 thread_index = vlib_get_thread_index();
57 ethernet_main_t * em = ðernet_main;
59 n_left_from = frame->n_vectors;
60 next_index = node->cached_next_index;
62 while (n_left_from > 0)
64 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
66 while (n_left_from > 0 && n_left_to_next > 0)
68 ip_adjacency_t * adj0;
71 u32 pi0, rw_len0, len0, adj_index0, next0 = 0;
74 pi0 = to_next[0] = from[0];
80 p0 = vlib_get_buffer (vm, pi0);
81 h0 = vlib_buffer_get_current (p0);
83 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
85 adj0 = adj_get (adj_index0);
87 /* Guess we are writing on ip4 header. */
88 vnet_rewrite_one_header (adj0[0], h0,
89 //sizeof (gre_header_t) +
90 sizeof (ip4_header_t));
92 /* Update packet buffer attributes/set output interface. */
93 rw_len0 = adj0[0].rewrite_header.data_bytes;
94 vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
95 vnet_buffer(p0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
96 len0 = vlib_buffer_length_in_chain (vm, p0);
97 /* since we are coming out of the L2 world, where the vlib_buffer
98 * union is used for other things, make sure it is clean for
101 vnet_buffer(p0)->mpls.first = 0;
104 vlib_increment_combined_counter(&adjacency_counters,
109 /* Check MTU of outgoing interface. */
110 if (PREDICT_TRUE(len0 <= adj0[0].rewrite_header.max_l3_packet_bytes))
112 /* Don't adjust the buffer for ttl issue; icmp-error node wants
113 * to see the IP header */
114 p0->current_data -= rw_len0;
115 p0->current_length += rw_len0;
116 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
120 adj0->sub_type.midchain.fixup_func(
122 adj0->sub_type.midchain.fixup_data);
125 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
128 * Follow the feature ARC. this will result eventually in
129 * the midchain-tx node
131 if (PREDICT_FALSE (adj0->rewrite_header.flags &
132 VNET_REWRITE_HAS_FEATURES))
133 vnet_feature_arc_start_w_cfg_index (
134 em->output_feature_arc_index,
139 next0 = adj0[0].rewrite_header.next_index;
143 /* can't fragment L2 */
144 next0 = ADJ_L2_REWRITE_NEXT_DROP;
147 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
149 adj_l2_trace_t *tr = vlib_add_trace (vm, node,
151 tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
154 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
155 to_next, n_left_to_next,
159 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
162 return frame->n_vectors;
165 VLIB_NODE_FN (adj_l2_rewrite_node) (vlib_main_t * vm,
166 vlib_node_runtime_t * node,
167 vlib_frame_t * frame)
169 if (adj_are_counters_enabled ())
170 return adj_l2_rewrite_inline (vm, node, frame, 0, 1);
172 return adj_l2_rewrite_inline (vm, node, frame, 0, 0);
175 VLIB_NODE_FN (adj_l2_midchain_node) (vlib_main_t * vm,
176 vlib_node_runtime_t * node,
177 vlib_frame_t * frame)
179 if (adj_are_counters_enabled ())
180 return adj_l2_rewrite_inline (vm, node, frame, 1, 1);
182 return adj_l2_rewrite_inline (vm, node, frame, 1, 0);
185 VLIB_REGISTER_NODE (adj_l2_rewrite_node) = {
186 .name = "adj-l2-rewrite",
187 .vector_size = sizeof (u32),
189 .format_trace = format_adj_l2_trace,
193 [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",
197 VLIB_REGISTER_NODE (adj_l2_midchain_node) = {
198 .name = "adj-l2-midchain",
199 .vector_size = sizeof (u32),
201 .format_trace = format_adj_l2_trace,
205 [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",