Line data Source code
1 : /*
2 : * Copyright (c) 2015 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 : #include <vppinfra/error.h>
16 : #include <vppinfra/hash.h>
17 : #include <vnet/vnet.h>
18 : #include <vnet/ip/ip.h>
19 : #include <vnet/udp/udp_local.h>
20 : #include <vnet/ethernet/ethernet.h>
21 : #include <vnet/vxlan-gpe/vxlan_gpe.h>
22 : #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_packet.h>
23 : #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam.h>
24 : #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_util.h>
25 : #include <vnet/fib/ip4_fib.h>
26 : #include <vnet/fib/fib_entry.h>
27 :
28 : /* Statistics (not really errors) */
29 : #define foreach_vxlan_gpe_transit_ioam_error \
30 : _(ENCAPSULATED, "good packets encapsulated")
31 :
32 : static char *vxlan_gpe_transit_ioam_error_strings[] = {
33 : #define _(sym,string) string,
34 : foreach_vxlan_gpe_transit_ioam_error
35 : #undef _
36 : };
37 :
38 : typedef enum
39 : {
40 : #define _(sym,str) VXLAN_GPE_TRANSIT_IOAM_ERROR_##sym,
41 : foreach_vxlan_gpe_transit_ioam_error
42 : #undef _
43 : VXLAN_GPE_TRANSIT_IOAM_N_ERROR,
44 : } vxlan_gpe_transit_ioam_error_t;
45 :
46 : typedef enum
47 : {
48 : VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT,
49 : VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
50 : VXLAN_GPE_TRANSIT_IOAM_N_NEXT
51 : } vxlan_gpe_transit_ioam_next_t;
52 :
53 :
54 : /* *INDENT-OFF* */
55 47063 : VNET_FEATURE_INIT (vxlan_gpe_transit_ioam, static) =
56 : {
57 : .arc_name = "ip4-output",
58 : .node_name = "vxlan-gpe-transit-ioam",
59 : .runs_before = VNET_FEATURES ("interface-output"),
60 : };
61 : /* *INDENT-ON* */
62 :
63 : static uword
64 0 : vxlan_gpe_transit_ioam (vlib_main_t * vm,
65 : vlib_node_runtime_t * node, vlib_frame_t * from_frame)
66 : {
67 : u32 n_left_from, next_index, *from, *to_next;
68 :
69 0 : from = vlib_frame_vector_args (from_frame);
70 0 : n_left_from = from_frame->n_vectors;
71 :
72 0 : next_index = node->cached_next_index;
73 :
74 0 : while (n_left_from > 0)
75 : {
76 : u32 n_left_to_next;
77 :
78 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
79 :
80 :
81 0 : while (n_left_from > 0 && n_left_to_next > 0)
82 : {
83 : u32 bi0;
84 : vlib_buffer_t *b0;
85 0 : u32 next0 = VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT;
86 :
87 0 : bi0 = from[0];
88 0 : to_next[0] = bi0;
89 0 : from += 1;
90 0 : to_next += 1;
91 0 : n_left_from -= 1;
92 0 : n_left_to_next -= 1;
93 : ip4_header_t *ip0;
94 0 : u32 iph_offset = 0;
95 :
96 0 : b0 = vlib_get_buffer (vm, bi0);
97 0 : iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
98 0 : ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
99 : + iph_offset);
100 :
101 : /* just forward non ipv4 packets */
102 0 : if (PREDICT_FALSE
103 : ((ip0->ip_version_and_header_length & 0xF0) == 0x40))
104 : {
105 : /* ipv4 packets */
106 0 : udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
107 0 : if (PREDICT_FALSE
108 : ((ip0->protocol == IP_PROTOCOL_UDP) &&
109 : (clib_net_to_host_u16 (udp_hdr0->dst_port) ==
110 : UDP_DST_PORT_VXLAN_GPE)))
111 : {
112 :
113 : /* Check the iOAM header */
114 0 : vxlan_gpe_header_t *gpe_hdr0 =
115 : (vxlan_gpe_header_t *) (udp_hdr0 + 1);
116 :
117 0 : if (PREDICT_FALSE
118 : (gpe_hdr0->protocol == VXLAN_GPE_PROTOCOL_IOAM))
119 : {
120 0 : uword *t = NULL;
121 0 : vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
122 : fib_prefix_t key4;
123 0 : clib_memset (&key4, 0, sizeof (key4));
124 0 : key4.fp_proto = FIB_PROTOCOL_IP4;
125 0 : key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
126 0 : t = hash_get_mem (hm->dst_by_ip4, &key4);
127 0 : if (t)
128 : {
129 :
130 :
131 0 : vlib_buffer_advance (b0,
132 : (word) (sizeof
133 : (ethernet_header_t)));
134 0 : vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node,
135 : b0,
136 : &next0,
137 : VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
138 : 1
139 : /* use_adj */
140 : );
141 0 : vlib_buffer_advance (b0,
142 : -(word) (sizeof
143 : (ethernet_header_t)));
144 : }
145 : }
146 : }
147 : }
148 :
149 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
150 : n_left_to_next, bi0, next0);
151 : }
152 :
153 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
154 : }
155 :
156 0 : return from_frame->n_vectors;
157 : }
158 :
159 : /* *INDENT-OFF* */
160 110920 : VLIB_REGISTER_NODE (vxlan_gpe_transit_ioam_node) = {
161 : .function = vxlan_gpe_transit_ioam,
162 : .name = "vxlan-gpe-transit-ioam",
163 : .vector_size = sizeof (u32),
164 : .format_trace = format_vxlan_gpe_ioam_v4_trace,
165 : .type = VLIB_NODE_TYPE_INTERNAL,
166 :
167 : .n_errors = ARRAY_LEN(vxlan_gpe_transit_ioam_error_strings),
168 : .error_strings = vxlan_gpe_transit_ioam_error_strings,
169 :
170 : .n_next_nodes = VXLAN_GPE_TRANSIT_IOAM_N_NEXT,
171 :
172 : .next_nodes = {
173 : [VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
174 : [VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
175 : },
176 :
177 : };
178 : /* *INDENT-ON* */
179 :
180 :
181 : /*
182 : * fd.io coding-style-patch-verification: ON
183 : *
184 : * Local Variables:
185 : * eval: (c-set-style "gnu")
186 : * End:
187 : */
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