2 * Copyright (c) 2017 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_nsh.h>
18 #include <vnet/ip/ip.h>
20 nsh_main_dummy_t nsh_main_dummy;
23 * @brief Trace data for a NSH Midchain
25 typedef struct adj_nsh_trace_t_ {
26 /** Adjacency index taken. */
31 format_adj_nsh_trace (u8 * s, va_list * args)
33 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
34 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
35 adj_nsh_trace_t * t = va_arg (*args, adj_nsh_trace_t *);
37 s = format (s, "adj-idx %d : %U",
39 format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE);
43 typedef enum adj_nsh_rewrite_next_t_
45 ADJ_NSH_REWRITE_NEXT_DROP,
46 } adj_gpe_rewrite_next_t;
49 adj_nsh_rewrite_inline (vlib_main_t * vm,
50 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();
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 /* We should never rewrite a pkt using the MISS adjacency */
87 adj0 = adj_get (adj_index0);
89 /* Guess we are only writing on simple IP4 header. */
90 vnet_rewrite_one_header(adj0[0], h0, 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;
96 vlib_increment_combined_counter(&adjacency_counters,
99 /* packet increment */ 0,
100 /* byte increment */ rw_len0);
102 /* Check MTU of outgoing interface. */
103 if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <=
104 adj0[0].rewrite_header.max_l3_packet_bytes)))
106 /* Don't adjust the buffer for ttl issue; icmp-error node wants
107 * to see the IP headerr */
108 p0->current_data -= rw_len0;
109 p0->current_length += rw_len0;
110 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
114 adj0->sub_type.midchain.fixup_func(
116 adj0->sub_type.midchain.fixup_data);
119 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
122 * Follow the feature ARC. this will result eventually in
123 * the midchain-tx node
125 vnet_feature_arc_start (nsh_main_dummy.output_feature_arc_index,
126 tx_sw_if_index0, &next0, p0);
130 /* can't fragment NSH */
131 next0 = ADJ_NSH_REWRITE_NEXT_DROP;
134 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
136 adj_nsh_trace_t *tr = vlib_add_trace (vm, node,
138 tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
141 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
142 to_next, n_left_to_next,
146 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
149 return frame->n_vectors;
153 adj_nsh_rewrite (vlib_main_t * vm,
154 vlib_node_runtime_t * node,
155 vlib_frame_t * frame)
157 return adj_nsh_rewrite_inline (vm, node, frame, 0);
161 adj_nsh_midchain (vlib_main_t * vm,
162 vlib_node_runtime_t * node,
163 vlib_frame_t * frame)
165 return adj_nsh_rewrite_inline (vm, node, frame, 1);
168 VLIB_REGISTER_NODE (adj_nsh_rewrite_node) = {
169 .function = adj_nsh_rewrite,
170 .name = "adj-nsh-rewrite",
171 .vector_size = sizeof (u32),
173 .format_trace = format_adj_nsh_trace,
177 [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
181 VLIB_NODE_FUNCTION_MULTIARCH (adj_nsh_rewrite_node, adj_nsh_rewrite)
183 VLIB_REGISTER_NODE (adj_nsh_midchain_node) = {
184 .function = adj_nsh_midchain,
185 .name = "adj-nsh-midchain",
186 .vector_size = sizeof (u32),
188 .format_trace = format_adj_nsh_trace,
192 [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
196 VLIB_NODE_FUNCTION_MULTIARCH (adj_nsh_midchain_node, adj_nsh_midchain)
198 /* Built-in ip4 tx feature path definition */
200 VNET_FEATURE_ARC_INIT (nsh_output, static) =
202 .arc_name = "nsh-output",
203 .start_nodes = VNET_FEATURES ("adj-nsh-midchain"),
204 .arc_index_ptr = &nsh_main_dummy.output_feature_arc_index,
207 VNET_FEATURE_INIT (nsh_tx_drop, static) =
209 .arc_name = "nsh-output",
210 .node_name = "error-drop",
211 .runs_before = 0, /* not before any other features */