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 : #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 <lisp/lisp-gpe/lisp_gpe_packet.h>
22 : #include <nsh/nsh.h>
23 : #include <nsh/nsh_packet.h>
24 : #include <nsh/nsh-md2-ioam/nsh_md2_ioam.h>
25 : #include <nsh/nsh-md2-ioam/nsh_md2_ioam_util.h>
26 : #include <vnet/fib/ip6_fib.h>
27 : #include <vnet/fib/ip4_fib.h>
28 : #include <vnet/fib/fib_entry.h>
29 :
30 : /* Statistics (not really errors) */
31 : #define foreach_nsh_md2_ioam_encap_transit_error \
32 : _(ENCAPSULATED, "good packets encapsulated")
33 :
34 : static char *nsh_md2_ioam_encap_transit_error_strings[] = {
35 : #define _(sym,string) string,
36 : foreach_nsh_md2_ioam_encap_transit_error
37 : #undef _
38 : };
39 :
40 : typedef enum
41 : {
42 : #define _(sym,str) NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_ERROR_##sym,
43 : foreach_nsh_md2_ioam_encap_transit_error
44 : #undef _
45 : NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_ERROR,
46 : } nsh_md2_ioam_encap_transit_error_t;
47 :
48 : typedef enum
49 : {
50 : NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT,
51 : NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
52 : NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT
53 : } nsh_md2_ioam_encap_transit_next_t;
54 :
55 :
56 : /* *INDENT-OFF* */
57 27647 : VNET_FEATURE_INIT (nsh_md2_ioam_encap_transit, static) =
58 : {
59 : .arc_name = "ip4-output",
60 : .node_name = "nsh-md2-ioam-encap-transit",
61 : };
62 : /* *INDENT-ON* */
63 :
64 :
65 : static uword
66 0 : nsh_md2_ioam_encap_transit (vlib_main_t * vm,
67 : vlib_node_runtime_t * node,
68 : vlib_frame_t * from_frame)
69 : {
70 : u32 n_left_from, next_index, *from, *to_next;
71 :
72 0 : from = vlib_frame_vector_args (from_frame);
73 0 : n_left_from = from_frame->n_vectors;
74 :
75 0 : next_index = node->cached_next_index;
76 :
77 0 : while (n_left_from > 0)
78 : {
79 : u32 n_left_to_next;
80 :
81 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
82 :
83 :
84 0 : while (n_left_from > 0 && n_left_to_next > 0)
85 : {
86 : u32 bi0;
87 : vlib_buffer_t *b0;
88 0 : u32 next0 = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT;
89 :
90 0 : bi0 = from[0];
91 0 : to_next[0] = bi0;
92 0 : from += 1;
93 0 : to_next += 1;
94 0 : n_left_from -= 1;
95 0 : n_left_to_next -= 1;
96 : ip4_header_t *ip0;
97 0 : u32 iph_offset = 0;
98 :
99 0 : b0 = vlib_get_buffer (vm, bi0);
100 0 : iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
101 0 : ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
102 : + iph_offset);
103 :
104 : /* just forward non ipv4 packets */
105 0 : if (PREDICT_FALSE
106 : ((ip0->ip_version_and_header_length & 0xF0) == 0x40))
107 : {
108 : /* ipv4 packets */
109 0 : udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
110 0 : if (PREDICT_FALSE
111 : ((ip0->protocol == IP_PROTOCOL_UDP) &&
112 : (clib_net_to_host_u16 (udp_hdr0->dst_port) ==
113 : UDP_DST_PORT_lisp_gpe)))
114 : {
115 :
116 : /* Check the iOAM header */
117 0 : lisp_gpe_header_t *lisp_gpe_hdr0 =
118 : (lisp_gpe_header_t *) (udp_hdr0 + 1);
119 0 : nsh_base_header_t *nsh_hdr =
120 : (nsh_base_header_t *) (lisp_gpe_hdr0 + 1);
121 :
122 0 : if (PREDICT_FALSE
123 : (lisp_gpe_hdr0->next_protocol ==
124 0 : LISP_GPE_NEXT_PROTO_NSH) && (nsh_hdr->md_type == 2))
125 : {
126 0 : uword *t = NULL;
127 0 : nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
128 : fib_prefix_t key4;
129 0 : clib_memset (&key4, 0, sizeof (key4));
130 0 : key4.fp_proto = FIB_PROTOCOL_IP4;
131 0 : key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
132 0 : t = hash_get_mem (hm->dst_by_ip4, &key4);
133 0 : if (t)
134 : {
135 0 : vlib_buffer_advance (b0,
136 : (word) (sizeof
137 : (ethernet_header_t)));
138 0 : nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vm,
139 : node,
140 : b0,
141 : &next0,
142 : NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
143 : 1
144 : /* use_adj */
145 : );
146 0 : vlib_buffer_advance (b0,
147 : -(word) (sizeof
148 : (ethernet_header_t)));
149 : }
150 : }
151 : }
152 : }
153 :
154 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
155 : n_left_to_next, bi0, next0);
156 : }
157 :
158 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
159 : }
160 :
161 0 : return from_frame->n_vectors;
162 : }
163 :
164 : extern u8 *format_nsh_node_map_trace (u8 * s, va_list * args);
165 : /* *INDENT-OFF* */
166 51864 : VLIB_REGISTER_NODE (nsh_md2_ioam_encap_transit_node) = {
167 : .function = nsh_md2_ioam_encap_transit,
168 : .name = "nsh-md2-ioam-encap-transit",
169 : .vector_size = sizeof (u32),
170 : .format_trace = format_nsh_node_map_trace,
171 : .type = VLIB_NODE_TYPE_INTERNAL,
172 :
173 : .n_errors = ARRAY_LEN(nsh_md2_ioam_encap_transit_error_strings),
174 : .error_strings = nsh_md2_ioam_encap_transit_error_strings,
175 :
176 : .n_next_nodes = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT,
177 :
178 : .next_nodes = {
179 : [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
180 : [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
181 : },
182 :
183 : };
184 : /* *INDENT-ON* */
185 :
186 :
187 : /*
188 : * fd.io coding-style-patch-verification: ON
189 : *
190 : * Local Variables:
191 : * eval: (c-set-style "gnu")
192 : * End:
193 : */
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