blob: 86908efbc04a2e14c6e6c280cebd67dc807e3d97 [file] [log] [blame]
Neale Ranns53da2212018-02-24 02:11:19 -08001/*
2 * Copyright (c) 2018 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 * @brief
17 * The data-path object representing performing a lookup in the IPv6
18 * link local table
19 */
20
21#include <vnet/dpo/ip6_ll_dpo.h>
22#include <vnet/ip/ip6_ll_table.h>
23
24/**
25 * @brief the IP6 link-local DPO is global
26 */
27static dpo_id_t ip6_ll_dpo = {
28 .dpoi_type = DPO_IP6_LL,
29 .dpoi_proto = DPO_PROTO_IP6,
30 .dpoi_index = 0,
31};
32
33const dpo_id_t *
34ip6_ll_dpo_get (void)
35{
36 return (&ip6_ll_dpo);
37}
38
39static void
40ip6_ll_dpo_lock (dpo_id_t * dpo)
41{
42 /*
43 * not maintaining a lock count on the ip6_ll, they are const global and
44 * never die.
45 */
46}
47
48static void
49ip6_ll_dpo_unlock (dpo_id_t * dpo)
50{
51}
52
53static u8 *
54format_ip6_ll_dpo (u8 * s, va_list * ap)
55{
56 CLIB_UNUSED (index_t index) = va_arg (*ap, index_t);
57 CLIB_UNUSED (u32 indent) = va_arg (*ap, u32);
58
59 return (format (s, "ip6-link-local"));
60}
61
62const static dpo_vft_t ip6_ll_vft = {
63 .dv_lock = ip6_ll_dpo_lock,
64 .dv_unlock = ip6_ll_dpo_unlock,
65 .dv_format = format_ip6_ll_dpo,
66};
67
68/**
69 * @brief The per-protocol VLIB graph nodes that are assigned to a ip6_ll
70 * object.
71 *
72 * this means that these graph nodes are ones from which a ip6_ll is the
73 * parent object in the DPO-graph.
74 */
75const static char *const ip6_null_nodes[] = {
76 "ip6-link-local",
77 NULL,
78};
79
80const static char *const *const ip6_ll_nodes[DPO_PROTO_NUM] = {
81 [DPO_PROTO_IP6] = ip6_null_nodes,
82};
83
84typedef struct ip6_ll_dpo_trace_t_
85{
86 u32 fib_index;
87 u32 sw_if_index;
88} ip6_ll_dpo_trace_t;
89
90/**
91 * @brief Exit nodes from a IP6_LL
92 */
93typedef enum ip6_ll_next_t_
94{
95 IP6_LL_NEXT_DROP,
96 IP6_LL_NEXT_LOOKUP,
97 IP6_LL_NEXT_NUM,
98} ip6_ll_next_t;
99
Vladislav Grishenkob9feb612021-11-19 22:53:41 +0500100typedef enum ip6_ll_error_t_
101{
102 IP6_LL_ERROR_NO_TABLE,
103} ip6_ll_error_t;
104
Neale Ranns53da2212018-02-24 02:11:19 -0800105always_inline uword
106ip6_ll_dpo_inline (vlib_main_t * vm,
107 vlib_node_runtime_t * node, vlib_frame_t * frame)
108{
109 u32 n_left_from, next_index, *from, *to_next;
110
111 from = vlib_frame_vector_args (frame);
112 n_left_from = frame->n_vectors;
113 next_index = node->cached_next_index;
114
115 while (n_left_from > 0)
116 {
117 u32 n_left_to_next;
118
119 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
120
121 while (n_left_from > 0 && n_left_to_next > 0)
122 {
123 u32 bi0, fib_index0, next0;
124 vlib_buffer_t *p0;
125
126 bi0 = from[0];
127 to_next[0] = bi0;
128 from += 1;
129 to_next += 1;
130 n_left_from -= 1;
131 n_left_to_next -= 1;
132 next0 = IP6_LL_NEXT_LOOKUP;
133
134 p0 = vlib_get_buffer (vm, bi0);
135
136 /* use the packet's RX interface to pick the link-local FIB */
137 fib_index0 =
138 ip6_ll_fib_get (vnet_buffer (p0)->sw_if_index[VLIB_RX]);
Vladislav Grishenkob9feb612021-11-19 22:53:41 +0500139
140 if (~0 == fib_index0)
141 {
142 next0 = IP6_LL_NEXT_DROP;
143 p0->error = node->errors[IP6_LL_ERROR_NO_TABLE];
144 goto trace0;
145 }
146
Neale Ranns53da2212018-02-24 02:11:19 -0800147 /* write that fib index into the packet so it's used in the
148 * lookup node next */
149 vnet_buffer (p0)->sw_if_index[VLIB_TX] = fib_index0;
150
Vladislav Grishenkob9feb612021-11-19 22:53:41 +0500151 trace0:
Neale Ranns53da2212018-02-24 02:11:19 -0800152 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
153 {
154 ip6_ll_dpo_trace_t *tr = vlib_add_trace (vm, node, p0,
155 sizeof (*tr));
156 tr->sw_if_index = vnet_buffer (p0)->sw_if_index[VLIB_RX];
157 tr->fib_index = fib_index0;
158 }
159 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
160 n_left_to_next, bi0, next0);
161 }
162
163 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
164 }
165
166 return frame->n_vectors;
167}
168
169static u8 *
170format_ip6_ll_dpo_trace (u8 * s, va_list * args)
171{
172 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
173 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
174 ip6_ll_dpo_trace_t *t = va_arg (*args, ip6_ll_dpo_trace_t *);
175
176 s = format (s, "sw_if_index:%d fib_index:%d", t->sw_if_index, t->fib_index);
177 return s;
178}
179
180static uword
181ip6_ll_dpo_switch (vlib_main_t * vm,
182 vlib_node_runtime_t * node, vlib_frame_t * frame)
183{
184 return (ip6_ll_dpo_inline (vm, node, frame));
185}
186
Vladislav Grishenkob9feb612021-11-19 22:53:41 +0500187static char *ip6_ll_dpo_error_strings[] = {
188 [IP6_LL_ERROR_NO_TABLE] = "Interface is not mapped to an IP6-LL table",
189};
190
Neale Ranns53da2212018-02-24 02:11:19 -0800191/**
192 * @brief
193 */
Neale Ranns53da2212018-02-24 02:11:19 -0800194VLIB_REGISTER_NODE (ip6_ll_dpo_node) =
195{
196 .function = ip6_ll_dpo_switch,
197 .name = "ip6-link-local",
198 .vector_size = sizeof (u32),
199 .format_trace = format_ip6_ll_dpo_trace,
Vladislav Grishenkob9feb612021-11-19 22:53:41 +0500200 .n_errors = ARRAY_LEN (ip6_ll_dpo_error_strings),
201 .error_strings = ip6_ll_dpo_error_strings,
Neale Ranns53da2212018-02-24 02:11:19 -0800202 .n_next_nodes = IP6_LL_NEXT_NUM,
203 .next_nodes = {
204 [IP6_LL_NEXT_DROP] = "ip6-drop",
205 [IP6_LL_NEXT_LOOKUP] = "ip6-lookup",
206 },
207};
Neale Ranns53da2212018-02-24 02:11:19 -0800208
209void
210ip6_ll_dpo_module_init (void)
211{
212 dpo_register (DPO_IP6_LL, &ip6_ll_vft, ip6_ll_nodes);
213}
214
215/*
216 * fd.io coding-style-patch-verification: ON
217 *
218 * Local Variables:
219 * eval: (c-set-style "gnu")
220 * End:
221 */