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37#define DEBUG_SUBSYSTEM S_LNET
38#include <linux/completion.h>
39#include "../../include/linux/lnet/lib-lnet.h"
40
41static int accept_port = 988;
42static int accept_backlog = 127;
43static int accept_timeout = 5;
44
45static struct {
46 int pta_shutdown;
47 struct socket *pta_sock;
48 struct completion pta_signal;
49} lnet_acceptor_state;
50
51int
52lnet_acceptor_port(void)
53{
54 return accept_port;
55}
56EXPORT_SYMBOL(lnet_acceptor_port);
57
58static inline int
59lnet_accept_magic(__u32 magic, __u32 constant)
60{
61 return (magic == constant ||
62 magic == __swab32(constant));
63}
64
65static char *accept = "secure";
66
67module_param(accept, charp, 0444);
68MODULE_PARM_DESC(accept, "Accept connections (secure|all|none)");
69module_param(accept_port, int, 0444);
70MODULE_PARM_DESC(accept_port, "Acceptor's port (same on all nodes)");
71module_param(accept_backlog, int, 0444);
72MODULE_PARM_DESC(accept_backlog, "Acceptor's listen backlog");
73module_param(accept_timeout, int, 0644);
74MODULE_PARM_DESC(accept_timeout, "Acceptor's timeout (seconds)");
75
76static char *accept_type;
77
78static int
79lnet_acceptor_get_tunables(void)
80{
81
82
83
84 accept_type = accept;
85 return 0;
86}
87
88int
89lnet_acceptor_timeout(void)
90{
91 return accept_timeout;
92}
93EXPORT_SYMBOL(lnet_acceptor_timeout);
94
95void
96lnet_connect_console_error(int rc, lnet_nid_t peer_nid,
97 __u32 peer_ip, int peer_port)
98{
99 switch (rc) {
100
101 case -ECONNREFUSED:
102 CNETERR("Connection to %s at host %pI4h on port %d was refused: check that Lustre is running on that node.\n",
103 libcfs_nid2str(peer_nid),
104 &peer_ip, peer_port);
105 break;
106 case -EHOSTUNREACH:
107 case -ENETUNREACH:
108 CNETERR("Connection to %s at host %pI4h was unreachable: the network or that node may be down, or Lustre may be misconfigured.\n",
109 libcfs_nid2str(peer_nid), &peer_ip);
110 break;
111 case -ETIMEDOUT:
112 CNETERR("Connection to %s at host %pI4h on port %d took too long: that node may be hung or experiencing high load.\n",
113 libcfs_nid2str(peer_nid),
114 &peer_ip, peer_port);
115 break;
116 case -ECONNRESET:
117 LCONSOLE_ERROR_MSG(0x11b, "Connection to %s at host %pI4h on port %d was reset: is it running a compatible version of Lustre and is %s one of its NIDs?\n",
118 libcfs_nid2str(peer_nid),
119 &peer_ip, peer_port,
120 libcfs_nid2str(peer_nid));
121 break;
122 case -EPROTO:
123 LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at host %pI4h on port %d: is it running a compatible version of Lustre?\n",
124 libcfs_nid2str(peer_nid),
125 &peer_ip, peer_port);
126 break;
127 case -EADDRINUSE:
128 LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to connect to %s at host %pI4h on port %d\n",
129 libcfs_nid2str(peer_nid),
130 &peer_ip, peer_port);
131 break;
132 default:
133 LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s at host %pI4h on port %d\n",
134 rc, libcfs_nid2str(peer_nid),
135 &peer_ip, peer_port);
136 break;
137 }
138}
139EXPORT_SYMBOL(lnet_connect_console_error);
140
141int
142lnet_connect(struct socket **sockp, lnet_nid_t peer_nid,
143 __u32 local_ip, __u32 peer_ip, int peer_port)
144{
145 lnet_acceptor_connreq_t cr;
146 struct socket *sock;
147 int rc;
148 int port;
149 int fatal;
150
151 CLASSERT(sizeof(cr) <= 16);
152
153 for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT;
154 port >= LNET_ACCEPTOR_MIN_RESERVED_PORT;
155 --port) {
156
157
158 rc = lnet_sock_connect(&sock, &fatal, local_ip, port, peer_ip,
159 peer_port);
160 if (rc != 0) {
161 if (fatal)
162 goto failed;
163 continue;
164 }
165
166 CLASSERT(LNET_PROTO_ACCEPTOR_VERSION == 1);
167
168 cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
169 cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
170 cr.acr_nid = peer_nid;
171
172 if (the_lnet.ln_testprotocompat != 0) {
173
174 lnet_net_lock(LNET_LOCK_EX);
175 if ((the_lnet.ln_testprotocompat & 4) != 0) {
176 cr.acr_version++;
177 the_lnet.ln_testprotocompat &= ~4;
178 }
179 if ((the_lnet.ln_testprotocompat & 8) != 0) {
180 cr.acr_magic = LNET_PROTO_MAGIC;
181 the_lnet.ln_testprotocompat &= ~8;
182 }
183 lnet_net_unlock(LNET_LOCK_EX);
184 }
185
186 rc = lnet_sock_write(sock, &cr, sizeof(cr), accept_timeout);
187 if (rc != 0)
188 goto failed_sock;
189
190 *sockp = sock;
191 return 0;
192 }
193
194 rc = -EADDRINUSE;
195 goto failed;
196
197 failed_sock:
198 sock_release(sock);
199 failed:
200 lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port);
201 return rc;
202}
203EXPORT_SYMBOL(lnet_connect);
204
205
206
207
208static int
209lnet_accept(struct socket *sock, __u32 magic)
210{
211 lnet_acceptor_connreq_t cr;
212 __u32 peer_ip;
213 int peer_port;
214 int rc;
215 int flip;
216 lnet_ni_t *ni;
217 char *str;
218
219 LASSERT(sizeof(cr) <= 16);
220
221 rc = lnet_sock_getaddr(sock, 1, &peer_ip, &peer_port);
222 LASSERT(rc == 0);
223
224 if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) {
225
226 if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) {
227
228
229
230
231
232 memset(&cr, 0, sizeof(cr));
233 cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
234 cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
235 rc = lnet_sock_write(sock, &cr, sizeof(cr),
236 accept_timeout);
237
238 if (rc != 0)
239 CERROR("Error sending magic+version in response to LNET magic from %pI4h: %d\n",
240 &peer_ip, rc);
241 return -EPROTO;
242 }
243
244 if (magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC))
245 str = "'old' socknal/tcpnal";
246 else
247 str = "unrecognised";
248
249 LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %pI4h magic %08x: %s acceptor protocol\n",
250 &peer_ip, magic, str);
251 return -EPROTO;
252 }
253
254 flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC);
255
256 rc = lnet_sock_read(sock, &cr.acr_version, sizeof(cr.acr_version),
257 accept_timeout);
258 if (rc != 0) {
259 CERROR("Error %d reading connection request version from %pI4h\n",
260 rc, &peer_ip);
261 return -EIO;
262 }
263
264 if (flip)
265 __swab32s(&cr.acr_version);
266
267 if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) {
268
269
270
271
272 int peer_version = cr.acr_version;
273
274 memset(&cr, 0, sizeof(cr));
275 cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
276 cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
277
278 rc = lnet_sock_write(sock, &cr, sizeof(cr), accept_timeout);
279 if (rc != 0)
280 CERROR("Error sending magic+version in response to version %d from %pI4h: %d\n",
281 peer_version, &peer_ip, rc);
282 return -EPROTO;
283 }
284
285 rc = lnet_sock_read(sock, &cr.acr_nid,
286 sizeof(cr) -
287 offsetof(lnet_acceptor_connreq_t, acr_nid),
288 accept_timeout);
289 if (rc != 0) {
290 CERROR("Error %d reading connection request from %pI4h\n",
291 rc, &peer_ip);
292 return -EIO;
293 }
294
295 if (flip)
296 __swab64s(&cr.acr_nid);
297
298 ni = lnet_net2ni(LNET_NIDNET(cr.acr_nid));
299 if (ni == NULL ||
300 ni->ni_nid != cr.acr_nid) {
301 if (ni != NULL)
302 lnet_ni_decref(ni);
303 LCONSOLE_ERROR_MSG(0x120, "Refusing connection from %pI4h for %s: No matching NI\n",
304 &peer_ip, libcfs_nid2str(cr.acr_nid));
305 return -EPERM;
306 }
307
308 if (ni->ni_lnd->lnd_accept == NULL) {
309
310 lnet_ni_decref(ni);
311 LCONSOLE_ERROR_MSG(0x121, "Refusing connection from %pI4h for %s: NI doesn not accept IP connections\n",
312 &peer_ip, libcfs_nid2str(cr.acr_nid));
313 return -EPERM;
314 }
315
316 CDEBUG(D_NET, "Accept %s from %pI4h\n",
317 libcfs_nid2str(cr.acr_nid), &peer_ip);
318
319 rc = ni->ni_lnd->lnd_accept(ni, sock);
320
321 lnet_ni_decref(ni);
322 return rc;
323}
324
325static int
326lnet_acceptor(void *arg)
327{
328 struct socket *newsock;
329 int rc;
330 __u32 magic;
331 __u32 peer_ip;
332 int peer_port;
333 int secure = (int)((long_ptr_t)arg);
334
335 LASSERT(lnet_acceptor_state.pta_sock == NULL);
336
337 cfs_block_allsigs();
338
339 rc = lnet_sock_listen(&lnet_acceptor_state.pta_sock, 0, accept_port,
340 accept_backlog);
341 if (rc != 0) {
342 if (rc == -EADDRINUSE)
343 LCONSOLE_ERROR_MSG(0x122, "Can't start acceptor on port %d: port already in use\n",
344 accept_port);
345 else
346 LCONSOLE_ERROR_MSG(0x123, "Can't start acceptor on port %d: unexpected error %d\n",
347 accept_port, rc);
348
349 lnet_acceptor_state.pta_sock = NULL;
350 } else {
351 LCONSOLE(0, "Accept %s, port %d\n", accept_type, accept_port);
352 }
353
354
355 lnet_acceptor_state.pta_shutdown = rc;
356 complete(&lnet_acceptor_state.pta_signal);
357
358 if (rc != 0)
359 return rc;
360
361 while (!lnet_acceptor_state.pta_shutdown) {
362
363 rc = lnet_sock_accept(&newsock, lnet_acceptor_state.pta_sock);
364 if (rc != 0) {
365 if (rc != -EAGAIN) {
366 CWARN("Accept error %d: pausing...\n", rc);
367 set_current_state(TASK_UNINTERRUPTIBLE);
368 schedule_timeout(cfs_time_seconds(1));
369 }
370 continue;
371 }
372
373
374 if (lnet_acceptor_state.pta_shutdown) {
375 sock_release(newsock);
376 break;
377 }
378
379 rc = lnet_sock_getaddr(newsock, 1, &peer_ip, &peer_port);
380 if (rc != 0) {
381 CERROR("Can't determine new connection's address\n");
382 goto failed;
383 }
384
385 if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
386 CERROR("Refusing connection from %pI4h: insecure port %d\n",
387 &peer_ip, peer_port);
388 goto failed;
389 }
390
391 rc = lnet_sock_read(newsock, &magic, sizeof(magic),
392 accept_timeout);
393 if (rc != 0) {
394 CERROR("Error %d reading connection request from %pI4h\n",
395 rc, &peer_ip);
396 goto failed;
397 }
398
399 rc = lnet_accept(newsock, magic);
400 if (rc != 0)
401 goto failed;
402
403 continue;
404
405failed:
406 sock_release(newsock);
407 }
408
409 sock_release(lnet_acceptor_state.pta_sock);
410 lnet_acceptor_state.pta_sock = NULL;
411
412 CDEBUG(D_NET, "Acceptor stopping\n");
413
414
415 complete(&lnet_acceptor_state.pta_signal);
416 return 0;
417}
418
419static inline int
420accept2secure(const char *acc, long *sec)
421{
422 if (!strcmp(acc, "secure")) {
423 *sec = 1;
424 return 1;
425 } else if (!strcmp(acc, "all")) {
426 *sec = 0;
427 return 1;
428 } else if (!strcmp(acc, "none")) {
429 return 0;
430 }
431
432 LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n",
433 acc);
434 return -EINVAL;
435}
436
437int
438lnet_acceptor_start(void)
439{
440 int rc;
441 long rc2;
442 long secure;
443
444 LASSERT(lnet_acceptor_state.pta_sock == NULL);
445
446 rc = lnet_acceptor_get_tunables();
447 if (rc != 0)
448 return rc;
449
450
451 init_completion(&lnet_acceptor_state.pta_signal);
452 rc = accept2secure(accept_type, &secure);
453 if (rc <= 0)
454 return rc;
455
456 if (lnet_count_acceptor_nis() == 0)
457 return 0;
458
459 rc2 = PTR_ERR(kthread_run(lnet_acceptor,
460 (void *)(ulong_ptr_t)secure,
461 "acceptor_%03ld", secure));
462 if (IS_ERR_VALUE(rc2)) {
463 CERROR("Can't start acceptor thread: %ld\n", rc2);
464
465 return -ESRCH;
466 }
467
468
469 wait_for_completion(&lnet_acceptor_state.pta_signal);
470
471 if (!lnet_acceptor_state.pta_shutdown) {
472
473 LASSERT(lnet_acceptor_state.pta_sock != NULL);
474 return 0;
475 }
476
477 LASSERT(lnet_acceptor_state.pta_sock == NULL);
478
479 return -ENETDOWN;
480}
481
482void
483lnet_acceptor_stop(void)
484{
485 if (lnet_acceptor_state.pta_sock == NULL)
486 return;
487
488 lnet_acceptor_state.pta_shutdown = 1;
489 wake_up_all(sk_sleep(lnet_acceptor_state.pta_sock->sk));
490
491
492 wait_for_completion(&lnet_acceptor_state.pta_signal);
493}
494
