Line data Source code
1 : /*
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:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
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.
14 : */
15 :
16 : #include <vnet/vnet.h>
17 : #include <vnet/adj/adj_nsh.h>
18 : #include <vnet/ip/ip.h>
19 :
20 : #ifndef CLIB_MARCH_VARIANT
21 : nsh_main_placeholder_t nsh_main_placeholder;
22 : #endif /* CLIB_MARCH_VARIANT */
23 :
24 : /**
25 : * @brief Trace data for a NSH Midchain
26 : */
27 : typedef struct adj_nsh_trace_t_ {
28 : /** Adjacency index taken. */
29 : u32 adj_index;
30 : } adj_nsh_trace_t;
31 :
32 : static u8 *
33 0 : format_adj_nsh_trace (u8 * s, va_list * args)
34 : {
35 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
36 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
37 0 : adj_nsh_trace_t * t = va_arg (*args, adj_nsh_trace_t *);
38 :
39 0 : s = format (s, "adj-idx %d : %U",
40 : t->adj_index,
41 : format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE);
42 0 : return s;
43 : }
44 :
45 : typedef enum adj_nsh_rewrite_next_t_
46 : {
47 : ADJ_NSH_REWRITE_NEXT_DROP,
48 : } adj_gpe_rewrite_next_t;
49 :
50 : always_inline uword
51 0 : adj_nsh_rewrite_inline (vlib_main_t * vm,
52 : vlib_node_runtime_t * node,
53 : vlib_frame_t * frame,
54 : int is_midchain)
55 : {
56 0 : u32 * from = vlib_frame_vector_args (frame);
57 : u32 n_left_from, n_left_to_next, * to_next, next_index;
58 0 : u32 thread_index = vlib_get_thread_index();
59 :
60 0 : n_left_from = frame->n_vectors;
61 0 : next_index = node->cached_next_index;
62 :
63 0 : while (n_left_from > 0)
64 : {
65 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
66 :
67 0 : while (n_left_from > 0 && n_left_to_next > 0)
68 : {
69 : ip_adjacency_t * adj0;
70 : vlib_buffer_t * p0;
71 : char *h0;
72 0 : u32 pi0, rw_len0, adj_index0, next0 = 0;
73 : u32 tx_sw_if_index0;
74 :
75 0 : pi0 = to_next[0] = from[0];
76 0 : from += 1;
77 0 : n_left_from -= 1;
78 0 : to_next += 1;
79 0 : n_left_to_next -= 1;
80 :
81 0 : p0 = vlib_get_buffer (vm, pi0);
82 0 : h0 = vlib_buffer_get_current (p0);
83 :
84 0 : adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
85 :
86 : /* We should never rewrite a pkt using the MISS adjacency */
87 0 : ASSERT(adj_index0);
88 :
89 0 : adj0 = adj_get (adj_index0);
90 :
91 : /* Guess we are only writing on simple IP4 header. */
92 0 : vnet_rewrite_one_header(adj0[0], h0, sizeof(ip4_header_t));
93 :
94 : /* Update packet buffer attributes/set output interface. */
95 0 : rw_len0 = adj0[0].rewrite_header.data_bytes;
96 0 : vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
97 :
98 0 : vlib_increment_combined_counter(&adjacency_counters,
99 : thread_index,
100 : adj_index0,
101 : /* packet increment */ 0,
102 : /* byte increment */ rw_len0);
103 :
104 : /* Check MTU of outgoing interface. */
105 0 : if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <=
106 : adj0[0].rewrite_header.max_l3_packet_bytes)))
107 : {
108 : /* Don't adjust the buffer for ttl issue; icmp-error node wants
109 : * to see the IP header */
110 0 : p0->current_data -= rw_len0;
111 0 : p0->current_length += rw_len0;
112 0 : tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
113 :
114 0 : if (is_midchain)
115 : {
116 0 : adj0->sub_type.midchain.fixup_func(
117 : vm, adj0, p0,
118 : adj0->sub_type.midchain.fixup_data);
119 : }
120 :
121 0 : vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
122 :
123 : /*
124 : * Follow the feature ARC. this will result eventually in
125 : * the midchain-tx node
126 : */
127 0 : vnet_feature_arc_start (nsh_main_placeholder.output_feature_arc_index,
128 : tx_sw_if_index0, &next0, p0);
129 : }
130 : else
131 : {
132 : /* can't fragment NSH */
133 0 : next0 = ADJ_NSH_REWRITE_NEXT_DROP;
134 : }
135 :
136 0 : if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
137 : {
138 0 : adj_nsh_trace_t *tr = vlib_add_trace (vm, node,
139 : p0, sizeof (*tr));
140 0 : tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
141 : }
142 :
143 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
144 : to_next, n_left_to_next,
145 : pi0, next0);
146 : }
147 :
148 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
149 : }
150 :
151 0 : return frame->n_vectors;
152 : }
153 :
154 2236 : VLIB_NODE_FN (adj_nsh_rewrite_node) (vlib_main_t * vm,
155 : vlib_node_runtime_t * node,
156 : vlib_frame_t * frame)
157 : {
158 0 : return adj_nsh_rewrite_inline (vm, node, frame, 0);
159 : }
160 :
161 2236 : VLIB_NODE_FN (adj_nsh_midchain_node) (vlib_main_t * vm,
162 : vlib_node_runtime_t * node,
163 : vlib_frame_t * frame)
164 : {
165 0 : return adj_nsh_rewrite_inline (vm, node, frame, 1);
166 : }
167 :
168 178120 : VLIB_REGISTER_NODE (adj_nsh_rewrite_node) = {
169 : .name = "adj-nsh-rewrite",
170 : .vector_size = sizeof (u32),
171 :
172 : .format_trace = format_adj_nsh_trace,
173 :
174 : .n_next_nodes = 1,
175 : .next_nodes = {
176 : [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
177 : },
178 : };
179 :
180 178120 : VLIB_REGISTER_NODE (adj_nsh_midchain_node) = {
181 : .name = "adj-nsh-midchain",
182 : .vector_size = sizeof (u32),
183 :
184 : .format_trace = format_adj_nsh_trace,
185 :
186 : .n_next_nodes = 1,
187 : .next_nodes = {
188 : [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
189 : },
190 : };
191 :
192 : /* Built-in ip4 tx feature path definition */
193 : /* *INDENT-OFF* */
194 1119 : VNET_FEATURE_ARC_INIT (nsh_output, static) =
195 : {
196 : .arc_name = "nsh-output",
197 : .start_nodes = VNET_FEATURES ("adj-nsh-midchain"),
198 : .arc_index_ptr = &nsh_main_placeholder.output_feature_arc_index,
199 : };
200 :
201 70583 : VNET_FEATURE_INIT (nsh_tx_drop, static) =
202 : {
203 : .arc_name = "nsh-output",
204 : .node_name = "error-drop",
205 : .runs_before = 0, /* not before any other features */
206 : };
207 : /* *INDENT-ON* */
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