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33#define DEBUG_SUBSYSTEM S_LNET
34#include <linux/completion.h>
35#include <net/sock.h>
36#include "../../include/linux/lnet/lib-lnet.h"
37
38static int accept_port = 988;
39static int accept_backlog = 127;
40static int accept_timeout = 5;
41
42static struct {
43 int pta_shutdown;
44 struct socket *pta_sock;
45 struct completion pta_signal;
46} lnet_acceptor_state = {
47 .pta_shutdown = 1
48};
49
50int
51lnet_acceptor_port(void)
52{
53 return accept_port;
54}
55EXPORT_SYMBOL(lnet_acceptor_port);
56
57static inline int
58lnet_accept_magic(__u32 magic, __u32 constant)
59{
60 return (magic == constant ||
61 magic == __swab32(constant));
62}
63
64static char *accept = "secure";
65
66module_param(accept, charp, 0444);
67MODULE_PARM_DESC(accept, "Accept connections (secure|all|none)");
68module_param(accept_port, int, 0444);
69MODULE_PARM_DESC(accept_port, "Acceptor's port (same on all nodes)");
70module_param(accept_backlog, int, 0444);
71MODULE_PARM_DESC(accept_backlog, "Acceptor's listen backlog");
72module_param(accept_timeout, int, 0644);
73MODULE_PARM_DESC(accept_timeout, "Acceptor's timeout (seconds)");
74
75static char *accept_type;
76
77static int
78lnet_acceptor_get_tunables(void)
79{
80
81
82
83
84
85 accept_type = accept;
86 return 0;
87}
88
89int
90lnet_acceptor_timeout(void)
91{
92 return accept_timeout;
93}
94EXPORT_SYMBOL(lnet_acceptor_timeout);
95
96void
97lnet_connect_console_error(int rc, lnet_nid_t peer_nid,
98 __u32 peer_ip, int peer_port)
99{
100 switch (rc) {
101
102 case -ECONNREFUSED:
103 CNETERR("Connection to %s at host %pI4h on port %d was refused: check that Lustre is running on that node.\n",
104 libcfs_nid2str(peer_nid),
105 &peer_ip, peer_port);
106 break;
107 case -EHOSTUNREACH:
108 case -ENETUNREACH:
109 CNETERR("Connection to %s at host %pI4h was unreachable: the network or that node may be down, or Lustre may be misconfigured.\n",
110 libcfs_nid2str(peer_nid), &peer_ip);
111 break;
112 case -ETIMEDOUT:
113 CNETERR("Connection to %s at host %pI4h on port %d took too long: that node may be hung or experiencing high load.\n",
114 libcfs_nid2str(peer_nid),
115 &peer_ip, peer_port);
116 break;
117 case -ECONNRESET:
118 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",
119 libcfs_nid2str(peer_nid),
120 &peer_ip, peer_port,
121 libcfs_nid2str(peer_nid));
122 break;
123 case -EPROTO:
124 LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at host %pI4h on port %d: is it running a compatible version of Lustre?\n",
125 libcfs_nid2str(peer_nid),
126 &peer_ip, peer_port);
127 break;
128 case -EADDRINUSE:
129 LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to connect to %s at host %pI4h on port %d\n",
130 libcfs_nid2str(peer_nid),
131 &peer_ip, peer_port);
132 break;
133 default:
134 LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s at host %pI4h on port %d\n",
135 rc, libcfs_nid2str(peer_nid),
136 &peer_ip, peer_port);
137 break;
138 }
139}
140EXPORT_SYMBOL(lnet_connect_console_error);
141
142int
143lnet_connect(struct socket **sockp, lnet_nid_t peer_nid,
144 __u32 local_ip, __u32 peer_ip, int peer_port)
145{
146 lnet_acceptor_connreq_t cr;
147 struct socket *sock;
148 int rc;
149 int port;
150 int fatal;
151
152 CLASSERT(sizeof(cr) <= 16);
153
154 for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT;
155 port >= LNET_ACCEPTOR_MIN_RESERVED_PORT;
156 --port) {
157
158
159 rc = lnet_sock_connect(&sock, &fatal, local_ip, port, peer_ip,
160 peer_port);
161 if (rc) {
162 if (fatal)
163 goto failed;
164 continue;
165 }
166
167 CLASSERT(LNET_PROTO_ACCEPTOR_VERSION == 1);
168
169 cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
170 cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
171 cr.acr_nid = peer_nid;
172
173 if (the_lnet.ln_testprotocompat) {
174
175 lnet_net_lock(LNET_LOCK_EX);
176 if (the_lnet.ln_testprotocompat & 4) {
177 cr.acr_version++;
178 the_lnet.ln_testprotocompat &= ~4;
179 }
180 if (the_lnet.ln_testprotocompat & 8) {
181 cr.acr_magic = LNET_PROTO_MAGIC;
182 the_lnet.ln_testprotocompat &= ~8;
183 }
184 lnet_net_unlock(LNET_LOCK_EX);
185 }
186
187 rc = lnet_sock_write(sock, &cr, sizeof(cr), accept_timeout);
188 if (rc)
189 goto failed_sock;
190
191 *sockp = sock;
192 return 0;
193 }
194
195 rc = -EADDRINUSE;
196 goto failed;
197
198 failed_sock:
199 sock_release(sock);
200 failed:
201 lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port);
202 return rc;
203}
204EXPORT_SYMBOL(lnet_connect);
205
206static int
207lnet_accept(struct socket *sock, __u32 magic)
208{
209 lnet_acceptor_connreq_t cr;
210 __u32 peer_ip;
211 int peer_port;
212 int rc;
213 int flip;
214 lnet_ni_t *ni;
215 char *str;
216
217 LASSERT(sizeof(cr) <= 16);
218
219 rc = lnet_sock_getaddr(sock, 1, &peer_ip, &peer_port);
220 LASSERT(!rc);
221
222 if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) {
223 if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) {
224
225
226
227
228
229
230 memset(&cr, 0, sizeof(cr));
231 cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
232 cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
233 rc = lnet_sock_write(sock, &cr, sizeof(cr),
234 accept_timeout);
235
236 if (rc)
237 CERROR("Error sending magic+version in response to LNET magic from %pI4h: %d\n",
238 &peer_ip, rc);
239 return -EPROTO;
240 }
241
242 if (magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC))
243 str = "'old' socknal/tcpnal";
244 else
245 str = "unrecognised";
246
247 LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %pI4h magic %08x: %s acceptor protocol\n",
248 &peer_ip, magic, str);
249 return -EPROTO;
250 }
251
252 flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC);
253
254 rc = lnet_sock_read(sock, &cr.acr_version, sizeof(cr.acr_version),
255 accept_timeout);
256 if (rc) {
257 CERROR("Error %d reading connection request version from %pI4h\n",
258 rc, &peer_ip);
259 return -EIO;
260 }
261
262 if (flip)
263 __swab32s(&cr.acr_version);
264
265 if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) {
266
267
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)
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) {
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 ||
300 ni->ni_nid != cr.acr_nid) {
301 if (ni)
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) {
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);
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) {
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)
359 return rc;
360
361 while (!lnet_acceptor_state.pta_shutdown) {
362 rc = lnet_sock_accept(&newsock, lnet_acceptor_state.pta_sock);
363 if (rc) {
364 if (rc != -EAGAIN) {
365 CWARN("Accept error %d: pausing...\n", rc);
366 set_current_state(TASK_UNINTERRUPTIBLE);
367 schedule_timeout(cfs_time_seconds(1));
368 }
369 continue;
370 }
371
372
373 if (lnet_acceptor_state.pta_shutdown) {
374 sock_release(newsock);
375 break;
376 }
377
378 rc = lnet_sock_getaddr(newsock, 1, &peer_ip, &peer_port);
379 if (rc) {
380 CERROR("Can't determine new connection's address\n");
381 goto failed;
382 }
383
384 if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
385 CERROR("Refusing connection from %pI4h: insecure port %d\n",
386 &peer_ip, peer_port);
387 goto failed;
388 }
389
390 rc = lnet_sock_read(newsock, &magic, sizeof(magic),
391 accept_timeout);
392 if (rc) {
393 CERROR("Error %d reading connection request from %pI4h\n",
394 rc, &peer_ip);
395 goto failed;
396 }
397
398 rc = lnet_accept(newsock, magic);
399 if (rc)
400 goto failed;
401
402 continue;
403
404failed:
405 sock_release(newsock);
406 }
407
408 sock_release(lnet_acceptor_state.pta_sock);
409 lnet_acceptor_state.pta_sock = NULL;
410
411 CDEBUG(D_NET, "Acceptor stopping\n");
412
413
414 complete(&lnet_acceptor_state.pta_signal);
415 return 0;
416}
417
418static inline int
419accept2secure(const char *acc, long *sec)
420{
421 if (!strcmp(acc, "secure")) {
422 *sec = 1;
423 return 1;
424 } else if (!strcmp(acc, "all")) {
425 *sec = 0;
426 return 1;
427 } else if (!strcmp(acc, "none")) {
428 return 0;
429 }
430
431 LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n",
432 acc);
433 return -EINVAL;
434}
435
436int
437lnet_acceptor_start(void)
438{
439 struct task_struct *task;
440 int rc;
441 long rc2;
442 long secure;
443
444
445 if (!lnet_acceptor_state.pta_shutdown)
446 return 0;
447
448 LASSERT(!lnet_acceptor_state.pta_sock);
449
450 rc = lnet_acceptor_get_tunables();
451 if (rc)
452 return rc;
453
454 init_completion(&lnet_acceptor_state.pta_signal);
455 rc = accept2secure(accept_type, &secure);
456 if (rc <= 0)
457 return rc;
458
459 if (!lnet_count_acceptor_nis())
460 return 0;
461
462 task = kthread_run(lnet_acceptor, (void *)(ulong_ptr_t)secure,
463 "acceptor_%03ld", secure);
464 if (IS_ERR(task)) {
465 rc2 = PTR_ERR(task);
466 CERROR("Can't start acceptor thread: %ld\n", rc2);
467
468 return -ESRCH;
469 }
470
471
472 wait_for_completion(&lnet_acceptor_state.pta_signal);
473
474 if (!lnet_acceptor_state.pta_shutdown) {
475
476 LASSERT(lnet_acceptor_state.pta_sock);
477 return 0;
478 }
479
480 LASSERT(!lnet_acceptor_state.pta_sock);
481
482 return -ENETDOWN;
483}
484
485void
486lnet_acceptor_stop(void)
487{
488 struct sock *sk;
489
490 if (lnet_acceptor_state.pta_shutdown)
491 return;
492
493 lnet_acceptor_state.pta_shutdown = 1;
494
495 sk = lnet_acceptor_state.pta_sock->sk;
496
497
498 sk->sk_state_change(sk);
499
500
501 wait_for_completion(&lnet_acceptor_state.pta_signal);
502}
503
