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Vector Packet Processing
fib_urpf_list.c
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1 /*
2  * Copyright (c) 2016 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/fib/fib_urpf_list.h>
17 #include <vnet/adj/adj.h>
18 
19 /**
20  * @brief pool of all fib_urpf_list
21  */
23 
24 u8 *
25 format_fib_urpf_list (u8 *s, va_list *args)
26 {
27  fib_urpf_list_t *urpf;
28  index_t ui;
29  u32 *swi;
30 
31  ui = va_arg(*args, index_t);
32 
33  if (INDEX_INVALID != ui)
34  {
35  urpf = fib_urpf_list_get(ui);
36 
37  s = format(s, "uPRF-list:%d len:%d itfs:[",
38  ui, vec_len(urpf->furpf_itfs));
39 
40  vec_foreach(swi, urpf->furpf_itfs)
41  {
42  s = format(s, "%d, ", *swi);
43  }
44  s = format(s, "]");
45  }
46  else
47  {
48  s = format(s, "uRPF-list: None");
49  }
50 
51  return (s);
52 }
53 
54 index_t
56 {
57  fib_urpf_list_t *urpf;
58 
59  pool_get(fib_urpf_list_pool, urpf);
60  clib_memset(urpf, 0, sizeof(*urpf));
61 
62  urpf->furpf_locks++;
63 
64  return (urpf - fib_urpf_list_pool);
65 }
66 
67 void
69 {
70  fib_urpf_list_t *urpf;
71 
72  if (INDEX_INVALID == ui)
73  return;
74 
75  urpf = fib_urpf_list_get(ui);
76 
77  urpf->furpf_locks--;
78 
79  if (0 == urpf->furpf_locks)
80  {
81  vec_free(urpf->furpf_itfs);
82  pool_put(fib_urpf_list_pool, urpf);
83  }
84 }
85 
86 void
88 {
89  fib_urpf_list_t *urpf;
90 
91  urpf = fib_urpf_list_get(ui);
92 
93  urpf->furpf_locks++;
94 }
95 
96 /**
97  * @brief Append another interface to the list.
98  */
99 void
102 {
103  fib_urpf_list_t *urpf;
104 
105  urpf = fib_urpf_list_get(ui);
106 
107  vec_add1(urpf->furpf_itfs, sw_if_index);
108 }
109 
110 /**
111  * @brief Combine to interface lists
112  */
113 void
115  index_t ui2)
116 {
117  fib_urpf_list_t *urpf1, *urpf2;
118 
119  urpf1 = fib_urpf_list_get(ui1);
120  urpf2 = fib_urpf_list_get(ui2);
121 
122  vec_append(urpf1->furpf_itfs, urpf2->furpf_itfs);
123 }
124 
125 /**
126  * @brief Sort the interface indicies.
127  * The sort is the first step in obtaining a unique list, so the order,
128  * w.r.t. next-hop, interface,etc is not important. So a sort based on the
129  * index is all we need.
130  */
131 static int
133  void * v2)
134 {
135  fib_node_index_t *i1 = v1, *i2 = v2;
136 
137  return (*i2 < *i1);
138 }
139 
140 /**
141  * @brief Convert the uRPF list from the itf set obtained during the walk
142  * to a unique list.
143  */
144 void
146 {
147  fib_urpf_list_t *urpf;
148 
149  urpf = fib_urpf_list_get(ui);
150 
152 
153  if (vec_len(urpf->furpf_itfs) > 1)
154  {
155  u32 i,j;
156 
157  /*
158  * cat list | sort | uniq > rpf_list
159  */
161 
162  i = 0, j = 1;
163  while (j < vec_len(urpf->furpf_itfs))
164  {
165  if (urpf->furpf_itfs[i] == urpf->furpf_itfs[j])
166  {
167  /*
168  * the itfacenct entries are the same.
169  * search forward for a unique one
170  */
171  while (urpf->furpf_itfs[i] == urpf->furpf_itfs[j] &&
172  j < vec_len(urpf->furpf_itfs))
173  {
174  j++;
175  }
176  if (j == vec_len(urpf->furpf_itfs))
177  {
178  /*
179  * ran off the end without finding a unique index.
180  * we are done.
181  */
182  break;
183  }
184  else
185  {
186  urpf->furpf_itfs[i+1] = urpf->furpf_itfs[j];
187  }
188  }
189  i++, j++;
190  }
191 
192  /*
193  * set the length of the vector to the number of unique itfs
194  */
195  _vec_len(urpf->furpf_itfs) = i+1;
196  }
197 
199 }
200 
201 void
203 {
204  fib_show_memory_usage("uRPF-list",
205  pool_elts(fib_urpf_list_pool),
206  pool_len(fib_urpf_list_pool),
207  sizeof(fib_urpf_list_t));
208 }
209 
210 static clib_error_t *
212  unformat_input_t * input,
213  vlib_cli_command_t * cmd)
214 {
215  index_t ui;
216 
217  if (unformat (input, "%d", &ui))
218  {
219  /*
220  * show one in detail
221  */
222  if (!pool_is_free_index(fib_urpf_list_pool, ui))
223  {
224  vlib_cli_output (vm, "%d@%U",
225  ui,
227  }
228  else
229  {
230  vlib_cli_output (vm, "uRPF %d invalid", ui);
231  }
232  }
233  else
234  {
235  /*
236  * show all
237  */
238  vlib_cli_output (vm, "FIB uRPF Entries:");
239  pool_foreach_index(ui, fib_urpf_list_pool,
240  ({
241  vlib_cli_output (vm, "%d@%U",
242  ui,
244  }));
245  }
246 
247  return (NULL);
248 }
249 
250 /* *INDENT-OFF* */
251 /*?
252  * The '<em>sh fib uRPF [index] </em>' command displays the uRPF lists
253  *
254  * @cliexpar
255  * @cliexstart{show fib uRPF}
256  * FIB uRPF Entries:
257  * 0@uPRF-list:0 len:0 itfs:[]
258  * 1@uPRF-list:1 len:2 itfs:[1, 2, ]
259  * 2@uPRF-list:2 len:1 itfs:[3, ]
260  * 3@uPRF-list:3 len:1 itfs:[9, ]
261  * @cliexend
262 ?*/
263 VLIB_CLI_COMMAND (show_fib_urpf_list, static) = {
264  .path = "show fib uRPF",
265  .function = show_fib_urpf_list_command,
266  .short_help = "show fib uRPF",
267 };
268 /* *INDENT-OFF* */
u32 sw_if_index
Definition: ipsec_gre.api:37
static int fib_urpf_itf_cmp_for_sort(void *v1, void *v2)
Sort the interface indicies.
#define NULL
Definition: clib.h:58
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
void fib_urpf_list_show_mem(void)
u32 index_t
A Data-Path Object is an object that represents actions that are applied to packets are they are swit...
Definition: dpo.h:41
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:522
int i
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
unsigned char u8
Definition: types.h:56
#define pool_len(p)
Number of elements in pool vector.
Definition: pool.h:140
index_t fib_urpf_list_alloc_and_lock(void)
Definition: fib_urpf_list.c:55
void fib_urpf_list_lock(index_t ui)
Definition: fib_urpf_list.c:87
static fib_urpf_list_t * fib_urpf_list_get(index_t index)
Definition: fib_urpf_list.h:96
void fib_show_memory_usage(const char *name, u32 in_use_elts, u32 allocd_elts, size_t size_elt)
Show the memory usage for a type.
Definition: fib_node.c:220
unsigned int u32
Definition: types.h:88
adj_index_t * furpf_itfs
The list of interfaces that comprise the allowed accepting interfaces.
Definition: fib_urpf_list.h:63
void fib_urpf_list_append(index_t ui, u32 sw_if_index)
Append another interface to the list.
fib_urpf_list_flag_t furpf_flags
flags
Definition: fib_urpf_list.h:68
Set to indicated that the uRPF list has already been baked.
Definition: fib_urpf_list.h:55
static clib_error_t * show_fib_urpf_list_command(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
struct _unformat_input_t unformat_input_t
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
vlib_main_t * vm
Definition: buffer.c:312
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
void fib_urpf_list_bake(index_t ui)
Convert the uRPF list from the itf set obtained during the walk to a unique list. ...
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:283
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
#define ASSERT(truth)
void fib_urpf_list_combine(index_t ui1, index_t ui2)
Combine to interface lists.
#define vec_append(v1, v2)
Append v2 after v1.
Definition: vec.h:818
fib_urpf_list_t * fib_urpf_list_pool
pool of all fib_urpf_list
Definition: fib_urpf_list.c:22
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define INDEX_INVALID
Invalid index - used when no index is known blazoned capitals INVALID speak volumes where ~0 does not...
Definition: dpo.h:47
u8 * format_fib_urpf_list(u8 *s, va_list *args)
Definition: fib_urpf_list.c:25
#define vec_sort_with_function(vec, f)
Sort a vector using the supplied element comparison function.
Definition: vec.h:980
u32 furpf_locks
uRPF lists are shared amongst many entries so we require a locking mechanism.
Definition: fib_urpf_list.h:74
void fib_urpf_list_unlock(index_t ui)
Definition: fib_urpf_list.c:68
#define vec_foreach(var, vec)
Vector iterator.
#define pool_foreach_index(i, v, body)
Iterate pool by index.
Definition: pool.h:538
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128