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Vector Packet Processing
mpls.c
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1 /*
2  * mpls.c: mpls
3  *
4  * Copyright (c) 2012 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vnet/vnet.h>
19 #include <vnet/mpls/mpls.h>
20 #include <vnet/fib/ip4_fib.h>
21 #include <vnet/fib/mpls_fib.h>
22 
23 const static char* mpls_eos_bit_names[] = MPLS_EOS_BITS;
24 
26 
27 u8 * format_mpls_unicast_label (u8 * s, va_list * args)
28 {
29  mpls_label_t label = va_arg (*args, mpls_label_t);
30 
31  switch (label) {
34  break;
37  break;
40  break;
43  break;
45  s = format (s, "%s", MPLS_IETF_ELI_STRING);
46  break;
48  s = format (s, "%s", MPLS_IETF_GAL_STRING);
49  break;
50  case MPLS_LABEL_POP:
51  s = format (s, "pop");
52  break;
53  default:
54  s = format (s, "%d", label);
55  break;
56  }
57  return s;
58 }
59 
61 {
62  mpls_label_t *label = va_arg (*args, mpls_label_t*);
63 
68  else if (unformat (input, MPLS_IETF_ROUTER_ALERT_STRING))
70  else if (unformat (input, MPLS_IETF_IMPLICIT_NULL_STRING))
80  else if (unformat (input, "%d", label))
81  ;
82  else
83  return (0);
84 
85  return (1);
86 }
87 
88 u8 * format_mpls_eos_bit (u8 * s, va_list * args)
89 {
90  mpls_eos_bit_t eb = va_arg (*args, mpls_eos_bit_t);
91 
92  ASSERT(eb <= MPLS_EOS);
93 
94  s = format(s, "%s", mpls_eos_bit_names[eb]);
95 
96  return (s);
97 }
98 
99 u8 * format_mpls_header (u8 * s, va_list * args)
100 {
101  mpls_unicast_header_t hdr = va_arg (*args, mpls_unicast_header_t);
102 
103  return (format(s, "[%U:%d:%d:%U]",
110 }
111 
112 uword
113 unformat_mpls_header (unformat_input_t * input, va_list * args)
114 {
115  u8 ** result = va_arg (*args, u8 **);
116  mpls_unicast_header_t _h, * h = &_h;
117  u32 label, label_exp_s_ttl;
118 
119  if (! unformat (input, "MPLS %d", &label))
120  return 0;
121 
122  label_exp_s_ttl = (label<<12) | (1<<8) /* s-bit */ | 0xFF;
123  h->label_exp_s_ttl = clib_host_to_net_u32 (label_exp_s_ttl);
124 
125  /* Add gre, mpls headers to result. */
126  {
127  void * p;
128  u32 h_n_bytes = sizeof (h[0]);
129 
130  vec_add2 (*result, p, h_n_bytes);
131  clib_memcpy (p, h, h_n_bytes);
132  }
133 
134  return 1;
135 }
136 
137 uword
139  va_list * args)
140 {
141  u32 * result = va_arg (*args, u32 *);
142  u32 label;
143 
144  if (!unformat (input, "MPLS: label %d", &label))
145  return 0;
146 
147  label = (label<<12) | (1<<8) /* s-bit set */ | 0xFF /* ttl */;
148 
149  *result = clib_host_to_net_u32 (label);
150  return 1;
151 }
152 
154 {
155  mpls_unicast_header_t *h = va_arg(*args, mpls_unicast_header_t *);
157 
158  s = format (s, "label %d exp %d, s %d, ttl %d",
159  vnet_mpls_uc_get_label (label),
160  vnet_mpls_uc_get_exp (label),
161  vnet_mpls_uc_get_s (label),
162  vnet_mpls_uc_get_ttl (label));
163  return s;
164 }
165 
167 {
168  mpls_unicast_header_t *h = va_arg(*args, mpls_unicast_header_t *);
169  mpls_unicast_header_t h_host;
170 
171  h_host.label_exp_s_ttl = clib_net_to_host_u32 (h->label_exp_s_ttl);
172 
174  &h_host);
175 }
176 
177 typedef struct {
184 
185 int
186 mpls_dest_cmp(void * a1, void * a2)
187 {
188  show_mpls_fib_t * r1 = a1;
189  show_mpls_fib_t * r2 = a2;
190 
191  return clib_net_to_host_u32(r1->dest) - clib_net_to_host_u32(r2->dest);
192 }
193 
194 int
195 mpls_fib_index_cmp(void * a1, void * a2)
196 {
197  show_mpls_fib_t * r1 = a1;
198  show_mpls_fib_t * r2 = a2;
199 
200  return r1->fib_index - r2->fib_index;
201 }
202 
203 int
204 mpls_label_cmp(void * a1, void * a2)
205 {
206  show_mpls_fib_t * r1 = a1;
207  show_mpls_fib_t * r2 = a2;
208 
209  return r1->label - r2->label;
210 }
211 
212 static clib_error_t *
214  unformat_input_t * input,
215  vlib_cli_command_t * cmd)
216 {
217  unformat_input_t _line_input, * line_input = &_line_input;
218  u32 table_id, is_del, is_ip, payload_proto;
219  fib_route_path_t *rpaths = NULL, rpath;
220  mpls_label_t local_label;
222  mpls_eos_bit_t eos;
223  fib_prefix_t pfx;
224 
225  error = NULL;
226  is_ip = 0;
227  table_id = 0;
228  eos = MPLS_EOS;
229  is_del = 0;
230  local_label = MPLS_LABEL_INVALID;
231  clib_memset(&pfx, 0, sizeof(pfx));
232  payload_proto = DPO_PROTO_MPLS;
233 
234  /* Get a line of input. */
235  if (! unformat_user (input, unformat_line_input, line_input))
236  return 0;
237 
238  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
239  {
240  if (unformat (line_input, "table %d", &table_id))
241  ;
242  else if (unformat (line_input, "del"))
243  is_del = 1;
244  else if (unformat (line_input, "add"))
245  is_del = 0;
246  else if (unformat (line_input, "eos"))
247  pfx.fp_eos = MPLS_EOS;
248  else if (unformat (line_input, "non-eos"))
249  pfx.fp_eos = MPLS_NON_EOS;
250  else if (unformat (line_input, "%U/%d",
252  &pfx.fp_addr.ip4,
253  &pfx.fp_len))
254  {
256  is_ip = 1;
257  }
258  else if (unformat (line_input, "%U/%d",
260  &pfx.fp_addr.ip6,
261  &pfx.fp_len))
262  {
264  is_ip = 1;
265  }
266  else if (unformat (line_input, "via %U",
268  &rpath, &payload_proto))
269  {
270  pfx.fp_payload_proto = payload_proto;
271  vec_add1(rpaths, rpath);
272  }
273  else if (unformat (line_input, "%d", &local_label))
274  ;
275  else
276  {
277  error = clib_error_return (0, "unknown input: %U",
278  format_unformat_error, line_input);
279  goto done;
280  }
281 
282  }
283 
284  if (MPLS_LABEL_INVALID == local_label)
285  {
286  error = clib_error_return (0, "local-label required: %U",
287  format_unformat_error, input);
288  goto done;
289  }
290 
291 
292  if (is_ip)
293  {
294  u32 fib_index = fib_table_find(pfx.fp_proto, table_id);
295 
296  if (FIB_NODE_INDEX_INVALID == fib_index)
297  {
298  error = clib_error_return (0, "%U table-id %d does not exist",
299  format_fib_protocol, pfx.fp_proto, table_id);
300  goto done;
301  }
302 
303  if (is_del)
304  {
305  fib_table_entry_local_label_remove(fib_index, &pfx, local_label);
306  }
307  else
308  {
309  fib_table_entry_local_label_add(fib_index, &pfx, local_label);
310  }
311  }
312  else
313  {
314  fib_node_index_t fib_index;
315 
316  if (NULL == rpaths)
317  {
318  error = clib_error_return(0 , "no paths");
319  goto done;
320  }
321 
323  pfx.fp_len = 21;
324  pfx.fp_label = local_label;
325  pfx.fp_payload_proto = rpaths[0].frp_proto;
326 
327  fib_index = mpls_fib_index_from_table_id(table_id);
328 
329  if (FIB_NODE_INDEX_INVALID == fib_index)
330  {
331  error = clib_error_return (0, "MPLS table-id %d does not exist",
332  table_id);
333  goto done;
334  }
335 
336  if (is_del)
337  {
339  &pfx,
341  rpaths);
342  }
343  else
344  {
345  fib_node_index_t lfe;
346 
347  lfe = fib_table_entry_path_add2(fib_index,
348  &pfx,
351  rpaths);
352 
353  if (FIB_NODE_INDEX_INVALID == lfe)
354  {
355  error = clib_error_return (0, "Failed to create %U-%U in MPLS table-id %d",
356  format_mpls_unicast_label, local_label,
357  format_mpls_eos_bit, eos,
358  table_id);
359  goto done;
360  }
361  }
362  }
363 
364 done:
365  unformat_free (line_input);
366 
367  return error;
368 }
369 
370 VLIB_CLI_COMMAND (mpls_local_label_command, static) = {
371  .path = "mpls local-label",
372  .function = vnet_mpls_local_label,
373  .short_help = "mpls local-label [add|del] <label-value> [eos|non-eos] via [next-hop-address] [next-hop-interface] [next-hop-table <value>] [weight <value>] [preference <value>] [udp-encap-id <value>] [ip4-lookup-in-table <value>] [ip6-lookup-in-table <value>] [mpls-lookup-in-table <value>] [resolve-via-host] [resolve-via-attached] [rx-ip4 <interface>] [out-labels <value value value>]",
374 };
375 
376 clib_error_t *
378  unformat_input_t * main_input,
379  vlib_cli_command_t * cmdo)
380 {
381  unformat_input_t _line_input, *line_input = &_line_input;
382  clib_error_t *error = NULL;
383  u32 table_id, is_add;
384  u8 *name = NULL;
385 
386  is_add = 1;
387  table_id = ~0;
388 
389  /* Get a line of input. */
390  if (!unformat_user (main_input, unformat_line_input, line_input))
391  return 0;
392 
393  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
394  {
395  if (unformat (line_input, "%d", &table_id))
396  ;
397  else if (unformat (line_input, "del"))
398  is_add = 0;
399  else if (unformat (line_input, "add"))
400  is_add = 1;
401  else if (unformat (line_input, "name %s", &name))
402  ;
403  else
404  {
405  error = unformat_parse_error (line_input);
406  goto done;
407  }
408  }
409 
410  if (~0 == table_id)
411  {
412  error = clib_error_return (0, "No table id");
413  goto done;
414  }
415  else
416  {
417  if (is_add)
418  {
419  mpls_table_create (table_id, 0, name);
420  }
421  else
422  {
423  mpls_table_delete (table_id, 0);
424  }
425  }
426 
427  done:
428  unformat_free (line_input);
429  return error;
430 }
431 
432 /* *INDENT-ON* */
433 /*?
434  * This command is used to add or delete MPLS Tables. All
435  * Tables must be explicitly added before that can be used,
436  * Including the default table.
437  ?*/
438 /* *INDENT-OFF* */
439 VLIB_CLI_COMMAND (mpls_table_command, static) = {
440  .path = "mpls table",
441  .short_help = "mpls table [add|del] <table-id>",
442  .function = vnet_mpls_table_cmd,
443  .is_mp_safe = 1,
444 };
445 
446 static clib_error_t *
448 {
450 
451  if ((error = vlib_call_init_function (vm, ip_main_init)))
452  return error;
453 
455 }
456 
fib_protocol_t fp_proto
protocol type
Definition: fib_types.h:211
uword unformat_mpls_unicast_label(unformat_input_t *input, va_list *args)
Definition: mpls.c:60
#define MPLS_EOS_BITS
Definition: packet.h:42
A representation of a path as described by a route producer.
Definition: fib_types.h:500
enum mpls_eos_bit_t_ mpls_eos_bit_t
uword unformat_fib_route_path(unformat_input_t *input, va_list *args)
Unformat a fib_route_path_t from CLI input.
Definition: fib_types.c:540
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
static u32 vnet_mpls_uc_get_ttl(mpls_label_t label_exp_s_ttl)
Definition: packet.h:120
fib_node_index_t fib_table_entry_path_add2(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags, fib_route_path_t *rpaths)
Add n paths to an entry (aka route) in the FIB.
Definition: fib_table.c:600
#define MPLS_IETF_IMPLICIT_NULL_LABEL
Definition: mpls_types.h:30
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:592
#define MPLS_IETF_ROUTER_ALERT_LABEL
Definition: mpls_types.h:28
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:630
u8 * format_mpls_unicast_label(u8 *s, va_list *args)
Definition: mpls.c:27
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:989
vlib_main_t * vm
Definition: in2out_ed.c:1580
u8 * format_mpls_unicast_header_host_byte_order(u8 *s, va_list *args)
Definition: mpls.c:153
dpo_proto_t frp_proto
The protocol of the address below.
Definition: fib_types.h:505
int mpls_dest_cmp(void *a1, void *a2)
Definition: mpls.c:186
u32 mpls_label_t
A label value only, i.e.
Definition: packet.h:26
void fib_table_entry_local_label_remove(u32 fib_index, const fib_prefix_t *prefix, mpls_label_t label)
remove a MPLS local label for the prefix/route.
Definition: fib_table.c:966
#define MPLS_IETF_IPV4_EXPLICIT_NULL_BRIEF_STRING
Definition: mpls_types.h:36
unsigned char u8
Definition: types.h:56
u8 * format_fib_protocol(u8 *s, va_list *ap)
Definition: fib_types.c:33
#define clib_memcpy(d, s, n)
Definition: string.h:180
dpo_proto_t fp_payload_proto
This protocol determines the payload protocol of packets that will be forwarded by this entry once th...
Definition: fib_types.h:235
unformat_function_t unformat_ip4_address
Definition: format.h:68
#define MPLS_IETF_ROUTER_ALERT_STRING
Definition: mpls_types.h:39
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
static u32 vnet_mpls_uc_get_s(mpls_label_t label_exp_s_ttl)
Definition: packet.h:115
description fragment has unexpected format
Definition: map.api:433
Aggregate type for a prefix.
Definition: fib_types.h:202
#define clib_error_return(e, args...)
Definition: error.h:99
static const char * mpls_eos_bit_names[]
Definition: mpls.c:23
unsigned int u32
Definition: types.h:88
#define MPLS_IETF_ROUTER_ALERT_BRIEF_STRING
Definition: mpls_types.h:40
u32 fib_table_find(fib_protocol_t proto, u32 table_id)
Get the index of the FIB for a Table-ID.
Definition: fib_table.c:1106
u16 fp_len
The mask length.
Definition: fib_types.h:206
#define vlib_call_init_function(vm, x)
Definition: init.h:270
#define MPLS_IETF_IPV6_EXPLICIT_NULL_BRIEF_STRING
Definition: mpls_types.h:42
Definition: fib_entry.h:112
unformat_function_t unformat_line_input
Definition: format.h:282
#define MPLS_IETF_GAL_STRING
Definition: mpls_types.h:45
Definition: cJSON.c:84
void mpls_table_delete(u32 table_id, u8 is_api)
Definition: mpls_api.c:62
#define MPLS_IETF_ELI_LABEL
Definition: mpls_types.h:31
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:225
u32 entry_index
Definition: mpls.c:179
struct _unformat_input_t unformat_input_t
vec_header_t h
Definition: buffer.c:322
clib_error_t * vnet_mpls_table_cmd(vlib_main_t *vm, unformat_input_t *main_input, vlib_cli_command_t *cmdo)
Definition: mpls.c:377
uword unformat_mpls_header(unformat_input_t *input, va_list *args)
Definition: mpls.c:113
u32 label
Definition: fib_types.api:25
#define MPLS_IETF_IPV4_EXPLICIT_NULL_STRING
Definition: mpls_types.h:35
static u32 vnet_mpls_uc_get_label(mpls_label_t label_exp_s_ttl)
Definition: packet.h:105
unformat_function_t unformat_ip6_address
Definition: format.h:89
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
void fib_table_entry_path_remove2(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_route_path_t *rpaths)
Remove n paths to an entry (aka route) in the FIB.
Definition: fib_table.c:649
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
From the CLI.
Definition: fib_source.h:76
fib_node_index_t fib_table_entry_local_label_add(u32 fib_index, const fib_prefix_t *prefix, mpls_label_t label)
Add a MPLS local label for the prefix/route.
Definition: fib_table.c:939
mpls_main_t mpls_main
Definition: mpls.c:25
#define MPLS_LABEL_INVALID
Definition: mpls_types.h:48
#define MPLS_IETF_IPV4_EXPLICIT_NULL_LABEL
Definition: mpls_types.h:27
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:29
#define MPLS_IETF_IMPLICIT_NULL_BRIEF_STRING
Definition: mpls_types.h:38
u32 mpls_fib_index_from_table_id(u32 table_id)
Definition: mpls_fib.c:73
string name[64]
Definition: ip.api:44
mpls_label_t fp_label
Definition: fib_types.h:228
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:158
static clib_error_t * mpls_input_init(vlib_main_t *vm)
Definition: mpls_input.c:279
u32 fib_index
Definition: mpls.c:178
#define MPLS_IETF_IPV6_EXPLICIT_NULL_STRING
Definition: mpls_types.h:41
#define ASSERT(truth)
static clib_error_t * vnet_mpls_local_label(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: mpls.c:213
#define MPLS_IETF_GAL_LABEL
Definition: mpls_types.h:32
void mpls_table_create(u32 table_id, u8 is_api, const u8 *name)
Definition: mpls_api.c:234
uword unformat_mpls_label_net_byte_order(unformat_input_t *input, va_list *args)
Definition: mpls.c:138
#define MPLS_IETF_ELI_STRING
Definition: mpls_types.h:43
mpls_label_t label_exp_s_ttl
Definition: packet.h:33
#define MPLS_LABEL_POP
A value that is explicit about the end of the LSP.
Definition: mpls_types.h:56
#define MPLS_IETF_IMPLICIT_NULL_STRING
Definition: mpls_types.h:37
static clib_error_t * mpls_init(vlib_main_t *vm)
Definition: mpls.c:447
#define unformat_parse_error(input)
Definition: format.h:268
u8 * format_mpls_unicast_header_net_byte_order(u8 *s, va_list *args)
Definition: mpls.c:166
static u32 vnet_mpls_uc_get_exp(mpls_label_t label_exp_s_ttl)
Definition: packet.h:110
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:30
u64 uword
Definition: types.h:112
static void unformat_free(unformat_input_t *i)
Definition: format.h:162
u32 table_id
Definition: wireguard.api:102
#define MPLS_IETF_IPV6_EXPLICIT_NULL_LABEL
Definition: mpls_types.h:29
u8 * format_mpls_eos_bit(u8 *s, va_list *args)
Definition: mpls.c:88
u8 * format_unformat_error(u8 *s, va_list *va)
Definition: unformat.c:91
int mpls_label_cmp(void *a1, void *a2)
Definition: mpls.c:204
int mpls_fib_index_cmp(void *a1, void *a2)
Definition: mpls.c:195
u8 * format_mpls_header(u8 *s, va_list *args)
Definition: mpls.c:99
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:978
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
mpls_eos_bit_t fp_eos
Definition: fib_types.h:229