aboutsummaryrefslogtreecommitdiffstats
path: root/src/vcl/vcl_private.h
blob: 4b08b65e9295345b294427868adf4d27e58fff3d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
/*
 * Copyright (c) 2018-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SRC_VCL_VCL_PRIVATE_H_
#define SRC_VCL_VCL_PRIVATE_H_

#include <vnet/session/application_interface.h>
#include <vcl/vppcom.h>
#include <vcl/vcl_debug.h>

#if (CLIB_DEBUG > 0)
/* Set VPPCOM_DEBUG_INIT 2 for connection debug,
 *                       3 for read/write debug output
 * or
 *    export VCL_DEBUG=<#> to set dynamically.
 */
#define VPPCOM_DEBUG_INIT 1
#else
#define VPPCOM_DEBUG_INIT 0
#endif

#define VPPCOM_DEBUG vcm->debug

extern __thread uword __vcl_worker_index;

static inline void
vcl_set_worker_index (uword wrk_index)
{
  __vcl_worker_index = wrk_index;
}

static inline uword
vcl_get_worker_index (void)
{
  return __vcl_worker_index;
}

/*
 * VPPCOM Private definitions and functions.
 */
typedef enum
{
  STATE_APP_START,
  STATE_APP_CONN_VPP,
  STATE_APP_ENABLED,
  STATE_APP_ATTACHED,
  STATE_APP_ADDING_WORKER,
  STATE_APP_ADDING_TLS_DATA,
  STATE_APP_FAILED,
  STATE_APP_READY
} app_state_t;

typedef enum
{
  STATE_CLOSED = 0,
  STATE_CONNECT = 0x01,
  STATE_LISTEN = 0x02,
  STATE_ACCEPT = 0x04,
  STATE_VPP_CLOSING = 0x08,
  STATE_DISCONNECT = 0x10,
  STATE_FAILED = 0x20,
  STATE_UPDATED = 0x40,
  STATE_LISTEN_NO_MQ = 0x80,
} vcl_session_state_t;

#define SERVER_STATE_OPEN  (STATE_ACCEPT|STATE_VPP_CLOSING)
#define CLIENT_STATE_OPEN  (STATE_CONNECT|STATE_VPP_CLOSING)
#define STATE_OPEN (SERVER_STATE_OPEN | CLIENT_STATE_OPEN)

typedef struct epoll_event vppcom_epoll_event_t;

typedef struct
{
  u32 next_sh;
  u32 prev_sh;
  u32 vep_sh;
  vppcom_epoll_event_t ev;
#define VEP_DEFAULT_ET_MASK  (EPOLLIN|EPOLLOUT)
#define VEP_UNSUPPORTED_EVENTS (EPOLLONESHOT|EPOLLEXCLUSIVE)
  u32 et_mask;
} vppcom_epoll_t;

/* Select uses the vcl_si_set as if a clib_bitmap. Make sure they are the
 * same size */
STATIC_ASSERT (sizeof (clib_bitmap_t) == sizeof (vcl_si_set),
	       "vppcom bitmap size mismatch");

typedef struct
{
  u8 is_ip4;
  ip46_address_t ip46;
} vppcom_ip46_t;

#define VCL_ACCEPTED_F_CLOSED 	(1 << 0)
#define VCL_ACCEPTED_F_RESET 	(1 << 1)

typedef struct vcl_session_msg
{
  u32 next;
  union
  {
    session_accepted_msg_t accepted_msg;
  };
  u32 flags;
} vcl_session_msg_t;

typedef enum
{
  VCL_SESS_ATTR_SERVER,
  VCL_SESS_ATTR_CUT_THRU,
  VCL_SESS_ATTR_VEP,
  VCL_SESS_ATTR_VEP_SESSION,
  VCL_SESS_ATTR_LISTEN,		// SOL_SOCKET,SO_ACCEPTCONN
  VCL_SESS_ATTR_NONBLOCK,	// fcntl,O_NONBLOCK
  VCL_SESS_ATTR_REUSEADDR,	// SOL_SOCKET,SO_REUSEADDR
  VCL_SESS_ATTR_REUSEPORT,	// SOL_SOCKET,SO_REUSEPORT
  VCL_SESS_ATTR_BROADCAST,	// SOL_SOCKET,SO_BROADCAST
  VCL_SESS_ATTR_V6ONLY,		// SOL_TCP,IPV6_V6ONLY
  VCL_SESS_ATTR_KEEPALIVE,	// SOL_SOCKET,SO_KEEPALIVE
  VCL_SESS_ATTR_TCP_NODELAY,	// SOL_TCP,TCP_NODELAY
  VCL_SESS_ATTR_TCP_KEEPIDLE,	// SOL_TCP,TCP_KEEPIDLE
  VCL_SESS_ATTR_TCP_KEEPINTVL,	// SOL_TCP,TCP_KEEPINTVL
  VCL_SESS_ATTR_SHUT_RD,
  VCL_SESS_ATTR_SHUT_WR,
  VCL_SESS_ATTR_MAX
} vppcom_session_attr_t;

#define VCL_SESS_ATTR_SET(ATTR, VAL)            \
do {                                            \
  (ATTR) |= 1 << (VAL);                         \
 } while (0)

#define VCL_SESS_ATTR_CLR(ATTR, VAL)            \
do {                                            \
  (ATTR) &= ~(1 << (VAL));                      \
 } while (0)

#define VCL_SESS_ATTR_TEST(ATTR, VAL)           \
  ((ATTR) & (1 << (VAL)) ? 1 : 0)

typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
#define _(type, name) type name;
  foreach_app_session_field
#undef _
  u32 sndbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_SNDBUF)
  u32 rcvbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_RCVBUF)
  u32 user_mss;			// VPP-TBD: Hack until support setsockopt(TCP_MAXSEG)
  u64 vpp_handle;
  u32 vpp_thread_index;

  svm_fifo_t *ct_rx_fifo;
  svm_fifo_t *ct_tx_fifo;

  /* Socket configuration state */
  u8 is_vep;
  u8 is_vep_session;
  /* VCL session index of the listening session (if any) */
  u32 listener_index;
  /* Accepted sessions on this listener */
  int n_accepted_sessions;
  u8 has_rx_evt;
  u32 attr;
  u64 parent_handle;
  vppcom_epoll_t vep;
  int libc_epfd;
  svm_msg_q_t *our_evt_q;
  vcl_session_msg_t *accept_evts_fifo;
#if VCL_ELOG
  elog_track_t elog_track;
#endif
} vcl_session_t;

typedef struct vppcom_cfg_t_
{
  uword heapsize;
  u32 max_workers;
  u32 vpp_api_q_length;
  uword segment_baseva;
  u32 segment_size;
  u32 add_segment_size;
  u32 preallocated_fifo_pairs;
  u32 rx_fifo_size;
  u32 tx_fifo_size;
  u32 event_queue_size;
  u32 listen_queue_size;
  u8 app_proxy_transport_tcp;
  u8 app_proxy_transport_udp;
  u8 app_scope_local;
  u8 app_scope_global;
  u8 *namespace_id;
  u64 namespace_secret;
  u8 use_mq_eventfd;
  f64 app_timeout;
  f64 session_timeout;
  f64 accept_timeout;
  u32 event_ring_size;
  char *event_log_path;
  u8 *vpp_api_filename;
  u8 *vpp_api_socket_name;
  u8 *vpp_api_chroot;
  u32 tls_engine;
} vppcom_cfg_t;

void vppcom_cfg (vppcom_cfg_t * vcl_cfg);

typedef struct vcl_cut_through_registration_
{
  svm_msg_q_t *mq;
  svm_msg_q_t *peer_mq;
  u32 sid;
  u32 epoll_evt_conn_index;	/*< mq evt connection index part of
				   the mqs evtfd epoll (if used) */
} vcl_cut_through_registration_t;

typedef struct vcl_mq_evt_conn_
{
  svm_msg_q_t *mq;
  int mq_fd;
} vcl_mq_evt_conn_t;

typedef struct vcl_worker_
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);

  /* Session pool */
  vcl_session_t *sessions;

  /** Worker/thread index in current process */
  u32 wrk_index;

  /** Worker index in vpp*/
  u32 vpp_wrk_index;

  /** API client handle */
  u32 my_client_index;

  /** State of the connection, shared between msg RX thread and main thread */
  volatile app_state_t wrk_state;

  /** VPP binary api input queue */
  svm_queue_t *vl_input_queue;

  /** VPP mq to be used for exchanging control messages */
  svm_msg_q_t *ctrl_mq;

  /** Message queues epoll fd. Initialized only if using mqs with eventfds */
  int mqs_epfd;

  /** Pool of event message queue event connections */
  vcl_mq_evt_conn_t *mq_evt_conns;

  /** Per worker buffer for receiving mq epoll events */
  struct epoll_event *mq_events;

  /** Hash table for disconnect processing */
  uword *session_index_by_vpp_handles;

  /** Select bitmaps */
  clib_bitmap_t *rd_bitmap;
  clib_bitmap_t *wr_bitmap;
  clib_bitmap_t *ex_bitmap;

  /** Our event message queue */
  svm_msg_q_t *app_event_queue;

  /** VPP workers event message queues */
  svm_msg_q_t **vpp_event_queues;

  /** For deadman timers */
  clib_time_t clib_time;

  /** Vector acting as buffer for mq messages */
  svm_msg_q_msg_t *mq_msg_vector;

  /** Vector of unhandled events */
  session_event_t *unhandled_evts_vector;

  u32 *pending_session_wrk_updates;

  /** Used also as a thread stop key buffer */
  pthread_t thread_id;

  /** Current pid, may be different from main_pid if forked child */
  pid_t current_pid;

  u32 forked_child;

  socket_client_main_t bapi_sock_ctx;
  memory_client_main_t bapi_shm_ctx;
  api_main_t bapi_api_ctx;
} vcl_worker_t;

typedef struct vppcom_main_t_
{
  u8 is_init;
  u32 debug;
  pthread_t main_cpu;

  /** Main process pid */
  pid_t main_pid;

  /** App's index in vpp. It's used by vpp to identify the app */
  u32 app_index;

  /** State of the connection, shared between msg RX thread and main thread */
  volatile app_state_t app_state;

  u8 *app_name;

  /** VCL configuration */
  vppcom_cfg_t cfg;

  volatile u32 forking;

  /** Workers */
  vcl_worker_t *workers;

  /** Lock to protect worker registrations */
  clib_spinlock_t workers_lock;

  /** Lock to protect segment hash table */
  clib_rwlock_t segment_table_lock;

  /** Mapped segments table */
  uword *segment_table;

  /** Control mq obtained from attach */
  svm_msg_q_t *ctrl_mq;

  fifo_segment_main_t segment_main;

#ifdef VCL_ELOG
  /* VPP Event-logger */
  elog_main_t elog_main;
  elog_track_t elog_track;
#endif

  /* VNET_API_ERROR_FOO -> "Foo" hash table */
  uword *error_string_by_error_number;

} vppcom_main_t;

extern vppcom_main_t *vcm;

#define VCL_INVALID_SESSION_INDEX ((u32)~0)
#define VCL_INVALID_SESSION_HANDLE ((u64)~0)
#define VCL_INVALID_SEGMENT_INDEX ((u32)~0)
#define VCL_INVALID_SEGMENT_HANDLE ((u64)~0)

static inline vcl_session_t *
vcl_session_alloc (vcl_worker_t * wrk)
{
  vcl_session_t *s;
  pool_get (wrk->sessions, s);
  memset (s, 0, sizeof (*s));
  s->session_index = s - wrk->sessions;
  s->listener_index = VCL_INVALID_SESSION_INDEX;
  return s;
}

static inline void
vcl_session_free (vcl_worker_t * wrk, vcl_session_t * s)
{
  VDBG (0, "session %u [0x%llx] removed", s->session_index, s->vpp_handle);
  pool_put (wrk->sessions, s);
}

static inline vcl_session_t *
vcl_session_get (vcl_worker_t * wrk, u32 session_index)
{
  if (pool_is_free_index (wrk->sessions, session_index))
    return 0;
  return pool_elt_at_index (wrk->sessions, session_index);
}

static inline vcl_session_handle_t
vcl_session_handle_from_index (u32 session_index)
{
  ASSERT (session_index < 2 << 24);
  return (vcl_get_worker_index () << 24 | session_index);
}

static inline vcl_session_handle_t
vcl_session_handle (vcl_session_t * s)
{
  return vcl_session_handle_from_index (s->session_index);
}

static inline void
vcl_session_handle_parse (u32 handle, u32 * wrk_index, u32 * session_index)
{
  *wrk_index = handle >> 24;
  *session_index = handle & 0xFFFFFF;
}

static inline vcl_session_t *
vcl_session_get_w_handle (vcl_worker_t * wrk, u32 session_handle)
{
  u32 session_index, wrk_index;
  vcl_session_handle_parse (session_handle, &wrk_index, &session_index);
  ASSERT (wrk_index == wrk->wrk_index);
  return vcl_session_get (wrk, session_index);
}

static inline vcl_session_t *
vcl_session_get_w_vpp_handle (vcl_worker_t * wrk, u64 vpp_handle)
{
  uword *p;
  if ((p = hash_get (wrk->session_index_by_vpp_handles, vpp_handle)))
    return vcl_session_get (wrk, (u32) p[0]);
  return 0;
}

static inline u32
vcl_session_index_from_vpp_handle (vcl_worker_t * wrk, u64 vpp_handle)
{
  uword *p;
  if ((p = hash_get (wrk->session_index_by_vpp_handles, vpp_handle)))
    return p[0];
  return VCL_INVALID_SESSION_INDEX;
}

static inline void
vcl_session_table_add_vpp_handle (vcl_worker_t * wrk, u64 handle, u32 value)
{
  hash_set (wrk->session_index_by_vpp_handles, handle, value);
}

static inline void
vcl_session_table_del_vpp_handle (vcl_worker_t * wrk, u64 vpp_handle)
{
  hash_unset (wrk->session_index_by_vpp_handles, vpp_handle);
}

static inline uword *
vcl_session_table_lookup_vpp_handle (vcl_worker_t * wrk, u64 handle)
{
  return hash_get (wrk->session_index_by_vpp_handles, handle);
}

static inline void
vcl_session_table_add_listener (vcl_worker_t * wrk, u64 listener_handle,
				u32 value)
{
  hash_set (wrk->session_index_by_vpp_handles, listener_handle, value);
}

static inline void
vcl_session_table_del_listener (vcl_worker_t * wrk, u64 listener_handle)
{
  hash_unset (wrk->session_index_by_vpp_handles, listener_handle);
}

static inline int
vcl_session_is_connectable_listener (vcl_worker_t * wrk,
				     vcl_session_t * session)
{
  /* Tell if we session_handle is a QUIC session.
   * We can be in the following cases :
   * Listen session <- QUIC session <- Stream session
   * QUIC session <- Stream session
   */
  vcl_session_t *ls;
  if (session->session_type != VPPCOM_PROTO_QUIC)
    return 0;
  if (session->listener_index == VCL_INVALID_SESSION_INDEX)
    return !(session->session_state & STATE_LISTEN);
  ls = vcl_session_get_w_handle (wrk, session->listener_index);
  if (!ls)
    return VPPCOM_EBADFD;
  return ls->session_state & STATE_LISTEN;
}

static inline vcl_session_t *
vcl_session_table_lookup_listener (vcl_worker_t * wrk, u64 handle)
{
  uword *p;
  vcl_session_t *session;

  p = hash_get (wrk->session_index_by_vpp_handles, handle);
  if (!p)
    {
      VDBG (0, "could not find listen session: unknown vpp listener handle"
	    " %llx", handle);
      return 0;
    }
  session = vcl_session_get (wrk, p[0]);
  if (!session)
    {
      VDBG (1, "invalid listen session index (%u)", p[0]);
      return 0;
    }

  ASSERT ((session->session_state & (STATE_LISTEN | STATE_LISTEN_NO_MQ)) ||
	  vcl_session_is_connectable_listener (wrk, session));
  return session;
}

const char *vppcom_session_state_str (vcl_session_state_t state);

static inline u8
vcl_session_is_ct (vcl_session_t * s)
{
  return (s->ct_tx_fifo != 0);
}

static inline u8
vcl_session_is_cl (vcl_session_t * s)
{
  if (s->session_type == VPPCOM_PROTO_UDP)
    return 1;
  return 0;
}

static inline u8
vcl_session_is_open (vcl_session_t * s)
{
  return ((s->session_state & STATE_OPEN)
	  || (s->session_state == STATE_LISTEN
	      && s->session_type == VPPCOM_PROTO_UDP));
}

static inline u8
vcl_session_is_closing (vcl_session_t * s)
{
  return (s->session_state == STATE_VPP_CLOSING
	  || s->session_state == STATE_DISCONNECT);
}

static inline int
vcl_session_closing_error (vcl_session_t * s)
{
  return s->session_state == STATE_DISCONNECT
    ? VPPCOM_ECONNRESET : VPPCOM_ECONNABORTED;
}

static inline int
vcl_session_closed_error (vcl_session_t * s)
{
  return s->session_state == STATE_DISCONNECT
    ? VPPCOM_ECONNRESET : VPPCOM_ENOTCONN;
}

/*
 * Helpers
 */
int vcl_wait_for_app_state_change (app_state_t app_state);
vcl_mq_evt_conn_t *vcl_mq_evt_conn_alloc (vcl_worker_t * wrk);
u32 vcl_mq_evt_conn_index (vcl_worker_t * wrk, vcl_mq_evt_conn_t * mqc);
vcl_mq_evt_conn_t *vcl_mq_evt_conn_get (vcl_worker_t * wrk, u32 mq_conn_idx);
int vcl_mq_epoll_add_evfd (vcl_worker_t * wrk, svm_msg_q_t * mq);
int vcl_mq_epoll_del_evfd (vcl_worker_t * wrk, u32 mqc_index);

vcl_worker_t *vcl_worker_alloc_and_init (void);
void vcl_worker_cleanup (vcl_worker_t * wrk, u8 notify_vpp);
int vcl_worker_register_with_vpp (void);
int vcl_worker_set_bapi (void);
svm_msg_q_t *vcl_worker_ctrl_mq (vcl_worker_t * wrk);

void vcl_flush_mq_events (void);
void vcl_cleanup_bapi (void);
int vcl_session_cleanup (vcl_worker_t * wrk, vcl_session_t * session,
			 vcl_session_handle_t sh, u8 do_disconnect);

void vcl_segment_table_add (u64 segment_handle, u32 svm_segment_index);
u32 vcl_segment_table_lookup (u64 segment_handle);
void vcl_segment_table_del (u64 segment_handle);

int vcl_session_read_ready (vcl_session_t * session);
int vcl_session_write_ready (vcl_session_t * session);

static inline vcl_worker_t *
vcl_worker_get (u32 wrk_index)
{
  return pool_elt_at_index (vcm->workers, wrk_index);
}

static inline vcl_worker_t *
vcl_worker_get_if_valid (u32 wrk_index)
{
  if (pool_is_free_index (vcm->workers, wrk_index))
    return 0;
  return pool_elt_at_index (vcm->workers, wrk_index);
}

static inline vcl_worker_t *
vcl_worker_get_current (void)
{
  return vcl_worker_get (vcl_get_worker_index ());
}

static inline u8
vcl_n_workers (void)
{
  return pool_elts (vcm->workers);
}

static inline svm_msg_q_t *
vcl_session_vpp_evt_q (vcl_worker_t * wrk, vcl_session_t * s)
{
  return wrk->vpp_event_queues[s->vpp_thread_index];
}

void vcl_send_session_worker_update (vcl_worker_t * wrk, vcl_session_t * s,
				     u32 wrk_index);
/*
 * VCL Binary API
 */
int vppcom_connect_to_vpp (char *app_name);
void vppcom_disconnect_from_vpp (void);
void vppcom_init_error_string_table (void);
void vppcom_send_session_enable_disable (u8 is_enable);
void vppcom_app_send_attach (void);
void vppcom_app_send_detach (void);
void vcl_send_session_unlisten (vcl_worker_t * wrk, vcl_session_t * s);
void vppcom_send_disconnect_session (u64 vpp_handle);
void vppcom_api_hookup (void);
void vppcom_send_application_tls_cert_add (vcl_session_t * session,
					   char *cert, u32 cert_len);
void vppcom_send_application_tls_key_add (vcl_session_t * session, char *key,
					  u32 key_len);
void vcl_send_app_worker_add_del (u8 is_add);
void vcl_send_child_worker_del (vcl_worker_t * wrk);

int vcl_segment_attach (u64 segment_handle, char *name,
			ssvm_segment_type_t type, int fd);
void vcl_segment_detach (u64 segment_handle);

u32 vcl_max_nsid_len (void);

u8 *format_api_error (u8 * s, va_list * args);

void vls_init ();
#endif /* SRC_VCL_VCL_PRIVATE_H_ */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */