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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/bvec.h>
5#include <linux/crc32c.h>
6#include <linux/net.h>
7#include <linux/socket.h>
8#include <net/sock.h>
9
10#include <linux/ceph/ceph_features.h>
11#include <linux/ceph/decode.h>
12#include <linux/ceph/libceph.h>
13#include <linux/ceph/messenger.h>
14
15/* static tag bytes (protocol control messages) */
16static char tag_msg = CEPH_MSGR_TAG_MSG;
17static char tag_ack = CEPH_MSGR_TAG_ACK;
18static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
19static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
20
21/*
22 * If @buf is NULL, discard up to @len bytes.
23 */
24static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
25{
26 struct kvec iov = {buf, len};
27 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
28 int r;
29
30 if (!buf)
31 msg.msg_flags |= MSG_TRUNC;
32
33 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, len);
34 r = sock_recvmsg(sock, &msg, msg.msg_flags);
35 if (r == -EAGAIN)
36 r = 0;
37 return r;
38}
39
40static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
41 int page_offset, size_t length)
42{
43 struct bio_vec bvec = {
44 .bv_page = page,
45 .bv_offset = page_offset,
46 .bv_len = length
47 };
48 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
49 int r;
50
51 BUG_ON(page_offset + length > PAGE_SIZE);
52 iov_iter_bvec(&msg.msg_iter, READ, &bvec, 1, length);
53 r = sock_recvmsg(sock, &msg, msg.msg_flags);
54 if (r == -EAGAIN)
55 r = 0;
56 return r;
57}
58
59/*
60 * write something. @more is true if caller will be sending more data
61 * shortly.
62 */
63static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
64 size_t kvlen, size_t len, bool more)
65{
66 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
67 int r;
68
69 if (more)
70 msg.msg_flags |= MSG_MORE;
71 else
72 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
73
74 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
75 if (r == -EAGAIN)
76 r = 0;
77 return r;
78}
79
80/*
81 * @more: either or both of MSG_MORE and MSG_SENDPAGE_NOTLAST
82 */
83static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
84 int offset, size_t size, int more)
85{
86 ssize_t (*sendpage)(struct socket *sock, struct page *page,
87 int offset, size_t size, int flags);
88 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | more;
89 int ret;
90
91 /*
92 * sendpage cannot properly handle pages with page_count == 0,
93 * we need to fall back to sendmsg if that's the case.
94 *
95 * Same goes for slab pages: skb_can_coalesce() allows
96 * coalescing neighboring slab objects into a single frag which
97 * triggers one of hardened usercopy checks.
98 */
99 if (sendpage_ok(page))
100 sendpage = sock->ops->sendpage;
101 else
102 sendpage = sock_no_sendpage;
103
104 ret = sendpage(sock, page, offset, size, flags);
105 if (ret == -EAGAIN)
106 ret = 0;
107
108 return ret;
109}
110
111static void con_out_kvec_reset(struct ceph_connection *con)
112{
113 BUG_ON(con->v1.out_skip);
114
115 con->v1.out_kvec_left = 0;
116 con->v1.out_kvec_bytes = 0;
117 con->v1.out_kvec_cur = &con->v1.out_kvec[0];
118}
119
120static void con_out_kvec_add(struct ceph_connection *con,
121 size_t size, void *data)
122{
123 int index = con->v1.out_kvec_left;
124
125 BUG_ON(con->v1.out_skip);
126 BUG_ON(index >= ARRAY_SIZE(con->v1.out_kvec));
127
128 con->v1.out_kvec[index].iov_len = size;
129 con->v1.out_kvec[index].iov_base = data;
130 con->v1.out_kvec_left++;
131 con->v1.out_kvec_bytes += size;
132}
133
134/*
135 * Chop off a kvec from the end. Return residual number of bytes for
136 * that kvec, i.e. how many bytes would have been written if the kvec
137 * hadn't been nuked.
138 */
139static int con_out_kvec_skip(struct ceph_connection *con)
140{
141 int skip = 0;
142
143 if (con->v1.out_kvec_bytes > 0) {
144 skip = con->v1.out_kvec_cur[con->v1.out_kvec_left - 1].iov_len;
145 BUG_ON(con->v1.out_kvec_bytes < skip);
146 BUG_ON(!con->v1.out_kvec_left);
147 con->v1.out_kvec_bytes -= skip;
148 con->v1.out_kvec_left--;
149 }
150
151 return skip;
152}
153
154static size_t sizeof_footer(struct ceph_connection *con)
155{
156 return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
157 sizeof(struct ceph_msg_footer) :
158 sizeof(struct ceph_msg_footer_old);
159}
160
161static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
162{
163 /* Initialize data cursor */
164
165 ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
166}
167
168/*
169 * Prepare footer for currently outgoing message, and finish things
170 * off. Assumes out_kvec* are already valid.. we just add on to the end.
171 */
172static void prepare_write_message_footer(struct ceph_connection *con)
173{
174 struct ceph_msg *m = con->out_msg;
175
176 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
177
178 dout("prepare_write_message_footer %p\n", con);
179 con_out_kvec_add(con, sizeof_footer(con), &m->footer);
180 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
181 if (con->ops->sign_message)
182 con->ops->sign_message(m);
183 else
184 m->footer.sig = 0;
185 } else {
186 m->old_footer.flags = m->footer.flags;
187 }
188 con->v1.out_more = m->more_to_follow;
189 con->v1.out_msg_done = true;
190}
191
192/*
193 * Prepare headers for the next outgoing message.
194 */
195static void prepare_write_message(struct ceph_connection *con)
196{
197 struct ceph_msg *m;
198 u32 crc;
199
200 con_out_kvec_reset(con);
201 con->v1.out_msg_done = false;
202
203 /* Sneak an ack in there first? If we can get it into the same
204 * TCP packet that's a good thing. */
205 if (con->in_seq > con->in_seq_acked) {
206 con->in_seq_acked = con->in_seq;
207 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
208 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
209 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
210 &con->v1.out_temp_ack);
211 }
212
213 ceph_con_get_out_msg(con);
214 m = con->out_msg;
215
216 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
217 m, con->out_seq, le16_to_cpu(m->hdr.type),
218 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
219 m->data_length);
220 WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));
221 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
222
223 /* tag + hdr + front + middle */
224 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
225 con_out_kvec_add(con, sizeof(con->v1.out_hdr), &con->v1.out_hdr);
226 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
227
228 if (m->middle)
229 con_out_kvec_add(con, m->middle->vec.iov_len,
230 m->middle->vec.iov_base);
231
232 /* fill in hdr crc and finalize hdr */
233 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
234 con->out_msg->hdr.crc = cpu_to_le32(crc);
235 memcpy(&con->v1.out_hdr, &con->out_msg->hdr, sizeof(con->v1.out_hdr));
236
237 /* fill in front and middle crc, footer */
238 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
239 con->out_msg->footer.front_crc = cpu_to_le32(crc);
240 if (m->middle) {
241 crc = crc32c(0, m->middle->vec.iov_base,
242 m->middle->vec.iov_len);
243 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
244 } else
245 con->out_msg->footer.middle_crc = 0;
246 dout("%s front_crc %u middle_crc %u\n", __func__,
247 le32_to_cpu(con->out_msg->footer.front_crc),
248 le32_to_cpu(con->out_msg->footer.middle_crc));
249 con->out_msg->footer.flags = 0;
250
251 /* is there a data payload? */
252 con->out_msg->footer.data_crc = 0;
253 if (m->data_length) {
254 prepare_message_data(con->out_msg, m->data_length);
255 con->v1.out_more = 1; /* data + footer will follow */
256 } else {
257 /* no, queue up footer too and be done */
258 prepare_write_message_footer(con);
259 }
260
261 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
262}
263
264/*
265 * Prepare an ack.
266 */
267static void prepare_write_ack(struct ceph_connection *con)
268{
269 dout("prepare_write_ack %p %llu -> %llu\n", con,
270 con->in_seq_acked, con->in_seq);
271 con->in_seq_acked = con->in_seq;
272
273 con_out_kvec_reset(con);
274
275 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
276
277 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
278 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
279 &con->v1.out_temp_ack);
280
281 con->v1.out_more = 1; /* more will follow.. eventually.. */
282 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
283}
284
285/*
286 * Prepare to share the seq during handshake
287 */
288static void prepare_write_seq(struct ceph_connection *con)
289{
290 dout("prepare_write_seq %p %llu -> %llu\n", con,
291 con->in_seq_acked, con->in_seq);
292 con->in_seq_acked = con->in_seq;
293
294 con_out_kvec_reset(con);
295
296 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
297 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
298 &con->v1.out_temp_ack);
299
300 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
301}
302
303/*
304 * Prepare to write keepalive byte.
305 */
306static void prepare_write_keepalive(struct ceph_connection *con)
307{
308 dout("prepare_write_keepalive %p\n", con);
309 con_out_kvec_reset(con);
310 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
311 struct timespec64 now;
312
313 ktime_get_real_ts64(&now);
314 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
315 ceph_encode_timespec64(&con->v1.out_temp_keepalive2, &now);
316 con_out_kvec_add(con, sizeof(con->v1.out_temp_keepalive2),
317 &con->v1.out_temp_keepalive2);
318 } else {
319 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
320 }
321 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
322}
323
324/*
325 * Connection negotiation.
326 */
327
328static int get_connect_authorizer(struct ceph_connection *con)
329{
330 struct ceph_auth_handshake *auth;
331 int auth_proto;
332
333 if (!con->ops->get_authorizer) {
334 con->v1.auth = NULL;
335 con->v1.out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
336 con->v1.out_connect.authorizer_len = 0;
337 return 0;
338 }
339
340 auth = con->ops->get_authorizer(con, &auth_proto, con->v1.auth_retry);
341 if (IS_ERR(auth))
342 return PTR_ERR(auth);
343
344 con->v1.auth = auth;
345 con->v1.out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
346 con->v1.out_connect.authorizer_len =
347 cpu_to_le32(auth->authorizer_buf_len);
348 return 0;
349}
350
351/*
352 * We connected to a peer and are saying hello.
353 */
354static void prepare_write_banner(struct ceph_connection *con)
355{
356 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
357 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
358 &con->msgr->my_enc_addr);
359
360 con->v1.out_more = 0;
361 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
362}
363
364static void __prepare_write_connect(struct ceph_connection *con)
365{
366 con_out_kvec_add(con, sizeof(con->v1.out_connect),
367 &con->v1.out_connect);
368 if (con->v1.auth)
369 con_out_kvec_add(con, con->v1.auth->authorizer_buf_len,
370 con->v1.auth->authorizer_buf);
371
372 con->v1.out_more = 0;
373 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
374}
375
376static int prepare_write_connect(struct ceph_connection *con)
377{
378 unsigned int global_seq = ceph_get_global_seq(con->msgr, 0);
379 int proto;
380 int ret;
381
382 switch (con->peer_name.type) {
383 case CEPH_ENTITY_TYPE_MON:
384 proto = CEPH_MONC_PROTOCOL;
385 break;
386 case CEPH_ENTITY_TYPE_OSD:
387 proto = CEPH_OSDC_PROTOCOL;
388 break;
389 case CEPH_ENTITY_TYPE_MDS:
390 proto = CEPH_MDSC_PROTOCOL;
391 break;
392 default:
393 BUG();
394 }
395
396 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
397 con->v1.connect_seq, global_seq, proto);
398
399 con->v1.out_connect.features =
400 cpu_to_le64(from_msgr(con->msgr)->supported_features);
401 con->v1.out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
402 con->v1.out_connect.connect_seq = cpu_to_le32(con->v1.connect_seq);
403 con->v1.out_connect.global_seq = cpu_to_le32(global_seq);
404 con->v1.out_connect.protocol_version = cpu_to_le32(proto);
405 con->v1.out_connect.flags = 0;
406
407 ret = get_connect_authorizer(con);
408 if (ret)
409 return ret;
410
411 __prepare_write_connect(con);
412 return 0;
413}
414
415/*
416 * write as much of pending kvecs to the socket as we can.
417 * 1 -> done
418 * 0 -> socket full, but more to do
419 * <0 -> error
420 */
421static int write_partial_kvec(struct ceph_connection *con)
422{
423 int ret;
424
425 dout("write_partial_kvec %p %d left\n", con, con->v1.out_kvec_bytes);
426 while (con->v1.out_kvec_bytes > 0) {
427 ret = ceph_tcp_sendmsg(con->sock, con->v1.out_kvec_cur,
428 con->v1.out_kvec_left,
429 con->v1.out_kvec_bytes,
430 con->v1.out_more);
431 if (ret <= 0)
432 goto out;
433 con->v1.out_kvec_bytes -= ret;
434 if (!con->v1.out_kvec_bytes)
435 break; /* done */
436
437 /* account for full iov entries consumed */
438 while (ret >= con->v1.out_kvec_cur->iov_len) {
439 BUG_ON(!con->v1.out_kvec_left);
440 ret -= con->v1.out_kvec_cur->iov_len;
441 con->v1.out_kvec_cur++;
442 con->v1.out_kvec_left--;
443 }
444 /* and for a partially-consumed entry */
445 if (ret) {
446 con->v1.out_kvec_cur->iov_len -= ret;
447 con->v1.out_kvec_cur->iov_base += ret;
448 }
449 }
450 con->v1.out_kvec_left = 0;
451 ret = 1;
452out:
453 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
454 con->v1.out_kvec_bytes, con->v1.out_kvec_left, ret);
455 return ret; /* done! */
456}
457
458/*
459 * Write as much message data payload as we can. If we finish, queue
460 * up the footer.
461 * 1 -> done, footer is now queued in out_kvec[].
462 * 0 -> socket full, but more to do
463 * <0 -> error
464 */
465static int write_partial_message_data(struct ceph_connection *con)
466{
467 struct ceph_msg *msg = con->out_msg;
468 struct ceph_msg_data_cursor *cursor = &msg->cursor;
469 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
470 int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
471 u32 crc;
472
473 dout("%s %p msg %p\n", __func__, con, msg);
474
475 if (!msg->num_data_items)
476 return -EINVAL;
477
478 /*
479 * Iterate through each page that contains data to be
480 * written, and send as much as possible for each.
481 *
482 * If we are calculating the data crc (the default), we will
483 * need to map the page. If we have no pages, they have
484 * been revoked, so use the zero page.
485 */
486 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
487 while (cursor->total_resid) {
488 struct page *page;
489 size_t page_offset;
490 size_t length;
491 int ret;
492
493 if (!cursor->resid) {
494 ceph_msg_data_advance(cursor, 0);
495 continue;
496 }
497
498 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
499 if (length == cursor->total_resid)
500 more = MSG_MORE;
501 ret = ceph_tcp_sendpage(con->sock, page, page_offset, length,
502 more);
503 if (ret <= 0) {
504 if (do_datacrc)
505 msg->footer.data_crc = cpu_to_le32(crc);
506
507 return ret;
508 }
509 if (do_datacrc && cursor->need_crc)
510 crc = ceph_crc32c_page(crc, page, page_offset, length);
511 ceph_msg_data_advance(cursor, (size_t)ret);
512 }
513
514 dout("%s %p msg %p done\n", __func__, con, msg);
515
516 /* prepare and queue up footer, too */
517 if (do_datacrc)
518 msg->footer.data_crc = cpu_to_le32(crc);
519 else
520 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
521 con_out_kvec_reset(con);
522 prepare_write_message_footer(con);
523
524 return 1; /* must return > 0 to indicate success */
525}
526
527/*
528 * write some zeros
529 */
530static int write_partial_skip(struct ceph_connection *con)
531{
532 int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
533 int ret;
534
535 dout("%s %p %d left\n", __func__, con, con->v1.out_skip);
536 while (con->v1.out_skip > 0) {
537 size_t size = min(con->v1.out_skip, (int)PAGE_SIZE);
538
539 if (size == con->v1.out_skip)
540 more = MSG_MORE;
541 ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size,
542 more);
543 if (ret <= 0)
544 goto out;
545 con->v1.out_skip -= ret;
546 }
547 ret = 1;
548out:
549 return ret;
550}
551
552/*
553 * Prepare to read connection handshake, or an ack.
554 */
555static void prepare_read_banner(struct ceph_connection *con)
556{
557 dout("prepare_read_banner %p\n", con);
558 con->v1.in_base_pos = 0;
559}
560
561static void prepare_read_connect(struct ceph_connection *con)
562{
563 dout("prepare_read_connect %p\n", con);
564 con->v1.in_base_pos = 0;
565}
566
567static void prepare_read_ack(struct ceph_connection *con)
568{
569 dout("prepare_read_ack %p\n", con);
570 con->v1.in_base_pos = 0;
571}
572
573static void prepare_read_seq(struct ceph_connection *con)
574{
575 dout("prepare_read_seq %p\n", con);
576 con->v1.in_base_pos = 0;
577 con->v1.in_tag = CEPH_MSGR_TAG_SEQ;
578}
579
580static void prepare_read_tag(struct ceph_connection *con)
581{
582 dout("prepare_read_tag %p\n", con);
583 con->v1.in_base_pos = 0;
584 con->v1.in_tag = CEPH_MSGR_TAG_READY;
585}
586
587static void prepare_read_keepalive_ack(struct ceph_connection *con)
588{
589 dout("prepare_read_keepalive_ack %p\n", con);
590 con->v1.in_base_pos = 0;
591}
592
593/*
594 * Prepare to read a message.
595 */
596static int prepare_read_message(struct ceph_connection *con)
597{
598 dout("prepare_read_message %p\n", con);
599 BUG_ON(con->in_msg != NULL);
600 con->v1.in_base_pos = 0;
601 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
602 return 0;
603}
604
605static int read_partial(struct ceph_connection *con,
606 int end, int size, void *object)
607{
608 while (con->v1.in_base_pos < end) {
609 int left = end - con->v1.in_base_pos;
610 int have = size - left;
611 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
612 if (ret <= 0)
613 return ret;
614 con->v1.in_base_pos += ret;
615 }
616 return 1;
617}
618
619/*
620 * Read all or part of the connect-side handshake on a new connection
621 */
622static int read_partial_banner(struct ceph_connection *con)
623{
624 int size;
625 int end;
626 int ret;
627
628 dout("read_partial_banner %p at %d\n", con, con->v1.in_base_pos);
629
630 /* peer's banner */
631 size = strlen(CEPH_BANNER);
632 end = size;
633 ret = read_partial(con, end, size, con->v1.in_banner);
634 if (ret <= 0)
635 goto out;
636
637 size = sizeof(con->v1.actual_peer_addr);
638 end += size;
639 ret = read_partial(con, end, size, &con->v1.actual_peer_addr);
640 if (ret <= 0)
641 goto out;
642 ceph_decode_banner_addr(&con->v1.actual_peer_addr);
643
644 size = sizeof(con->v1.peer_addr_for_me);
645 end += size;
646 ret = read_partial(con, end, size, &con->v1.peer_addr_for_me);
647 if (ret <= 0)
648 goto out;
649 ceph_decode_banner_addr(&con->v1.peer_addr_for_me);
650
651out:
652 return ret;
653}
654
655static int read_partial_connect(struct ceph_connection *con)
656{
657 int size;
658 int end;
659 int ret;
660
661 dout("read_partial_connect %p at %d\n", con, con->v1.in_base_pos);
662
663 size = sizeof(con->v1.in_reply);
664 end = size;
665 ret = read_partial(con, end, size, &con->v1.in_reply);
666 if (ret <= 0)
667 goto out;
668
669 if (con->v1.auth) {
670 size = le32_to_cpu(con->v1.in_reply.authorizer_len);
671 if (size > con->v1.auth->authorizer_reply_buf_len) {
672 pr_err("authorizer reply too big: %d > %zu\n", size,
673 con->v1.auth->authorizer_reply_buf_len);
674 ret = -EINVAL;
675 goto out;
676 }
677
678 end += size;
679 ret = read_partial(con, end, size,
680 con->v1.auth->authorizer_reply_buf);
681 if (ret <= 0)
682 goto out;
683 }
684
685 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
686 con, con->v1.in_reply.tag,
687 le32_to_cpu(con->v1.in_reply.connect_seq),
688 le32_to_cpu(con->v1.in_reply.global_seq));
689out:
690 return ret;
691}
692
693/*
694 * Verify the hello banner looks okay.
695 */
696static int verify_hello(struct ceph_connection *con)
697{
698 if (memcmp(con->v1.in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
699 pr_err("connect to %s got bad banner\n",
700 ceph_pr_addr(&con->peer_addr));
701 con->error_msg = "protocol error, bad banner";
702 return -1;
703 }
704 return 0;
705}
706
707static int process_banner(struct ceph_connection *con)
708{
709 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
710
711 dout("process_banner on %p\n", con);
712
713 if (verify_hello(con) < 0)
714 return -1;
715
716 /*
717 * Make sure the other end is who we wanted. note that the other
718 * end may not yet know their ip address, so if it's 0.0.0.0, give
719 * them the benefit of the doubt.
720 */
721 if (memcmp(&con->peer_addr, &con->v1.actual_peer_addr,
722 sizeof(con->peer_addr)) != 0 &&
723 !(ceph_addr_is_blank(&con->v1.actual_peer_addr) &&
724 con->v1.actual_peer_addr.nonce == con->peer_addr.nonce)) {
725 pr_warn("wrong peer, want %s/%u, got %s/%u\n",
726 ceph_pr_addr(&con->peer_addr),
727 le32_to_cpu(con->peer_addr.nonce),
728 ceph_pr_addr(&con->v1.actual_peer_addr),
729 le32_to_cpu(con->v1.actual_peer_addr.nonce));
730 con->error_msg = "wrong peer at address";
731 return -1;
732 }
733
734 /*
735 * did we learn our address?
736 */
737 if (ceph_addr_is_blank(my_addr)) {
738 memcpy(&my_addr->in_addr,
739 &con->v1.peer_addr_for_me.in_addr,
740 sizeof(con->v1.peer_addr_for_me.in_addr));
741 ceph_addr_set_port(my_addr, 0);
742 ceph_encode_my_addr(con->msgr);
743 dout("process_banner learned my addr is %s\n",
744 ceph_pr_addr(my_addr));
745 }
746
747 return 0;
748}
749
750static int process_connect(struct ceph_connection *con)
751{
752 u64 sup_feat = from_msgr(con->msgr)->supported_features;
753 u64 req_feat = from_msgr(con->msgr)->required_features;
754 u64 server_feat = le64_to_cpu(con->v1.in_reply.features);
755 int ret;
756
757 dout("process_connect on %p tag %d\n", con, con->v1.in_tag);
758
759 if (con->v1.auth) {
760 int len = le32_to_cpu(con->v1.in_reply.authorizer_len);
761
762 /*
763 * Any connection that defines ->get_authorizer()
764 * should also define ->add_authorizer_challenge() and
765 * ->verify_authorizer_reply().
766 *
767 * See get_connect_authorizer().
768 */
769 if (con->v1.in_reply.tag ==
770 CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
771 ret = con->ops->add_authorizer_challenge(
772 con, con->v1.auth->authorizer_reply_buf, len);
773 if (ret < 0)
774 return ret;
775
776 con_out_kvec_reset(con);
777 __prepare_write_connect(con);
778 prepare_read_connect(con);
779 return 0;
780 }
781
782 if (len) {
783 ret = con->ops->verify_authorizer_reply(con);
784 if (ret < 0) {
785 con->error_msg = "bad authorize reply";
786 return ret;
787 }
788 }
789 }
790
791 switch (con->v1.in_reply.tag) {
792 case CEPH_MSGR_TAG_FEATURES:
793 pr_err("%s%lld %s feature set mismatch,"
794 " my %llx < server's %llx, missing %llx\n",
795 ENTITY_NAME(con->peer_name),
796 ceph_pr_addr(&con->peer_addr),
797 sup_feat, server_feat, server_feat & ~sup_feat);
798 con->error_msg = "missing required protocol features";
799 return -1;
800
801 case CEPH_MSGR_TAG_BADPROTOVER:
802 pr_err("%s%lld %s protocol version mismatch,"
803 " my %d != server's %d\n",
804 ENTITY_NAME(con->peer_name),
805 ceph_pr_addr(&con->peer_addr),
806 le32_to_cpu(con->v1.out_connect.protocol_version),
807 le32_to_cpu(con->v1.in_reply.protocol_version));
808 con->error_msg = "protocol version mismatch";
809 return -1;
810
811 case CEPH_MSGR_TAG_BADAUTHORIZER:
812 con->v1.auth_retry++;
813 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
814 con->v1.auth_retry);
815 if (con->v1.auth_retry == 2) {
816 con->error_msg = "connect authorization failure";
817 return -1;
818 }
819 con_out_kvec_reset(con);
820 ret = prepare_write_connect(con);
821 if (ret < 0)
822 return ret;
823 prepare_read_connect(con);
824 break;
825
826 case CEPH_MSGR_TAG_RESETSESSION:
827 /*
828 * If we connected with a large connect_seq but the peer
829 * has no record of a session with us (no connection, or
830 * connect_seq == 0), they will send RESETSESION to indicate
831 * that they must have reset their session, and may have
832 * dropped messages.
833 */
834 dout("process_connect got RESET peer seq %u\n",
835 le32_to_cpu(con->v1.in_reply.connect_seq));
836 pr_info("%s%lld %s session reset\n",
837 ENTITY_NAME(con->peer_name),
838 ceph_pr_addr(&con->peer_addr));
839 ceph_con_reset_session(con);
840 con_out_kvec_reset(con);
841 ret = prepare_write_connect(con);
842 if (ret < 0)
843 return ret;
844 prepare_read_connect(con);
845
846 /* Tell ceph about it. */
847 mutex_unlock(&con->mutex);
848 if (con->ops->peer_reset)
849 con->ops->peer_reset(con);
850 mutex_lock(&con->mutex);
851 if (con->state != CEPH_CON_S_V1_CONNECT_MSG)
852 return -EAGAIN;
853 break;
854
855 case CEPH_MSGR_TAG_RETRY_SESSION:
856 /*
857 * If we sent a smaller connect_seq than the peer has, try
858 * again with a larger value.
859 */
860 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
861 le32_to_cpu(con->v1.out_connect.connect_seq),
862 le32_to_cpu(con->v1.in_reply.connect_seq));
863 con->v1.connect_seq = le32_to_cpu(con->v1.in_reply.connect_seq);
864 con_out_kvec_reset(con);
865 ret = prepare_write_connect(con);
866 if (ret < 0)
867 return ret;
868 prepare_read_connect(con);
869 break;
870
871 case CEPH_MSGR_TAG_RETRY_GLOBAL:
872 /*
873 * If we sent a smaller global_seq than the peer has, try
874 * again with a larger value.
875 */
876 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
877 con->v1.peer_global_seq,
878 le32_to_cpu(con->v1.in_reply.global_seq));
879 ceph_get_global_seq(con->msgr,
880 le32_to_cpu(con->v1.in_reply.global_seq));
881 con_out_kvec_reset(con);
882 ret = prepare_write_connect(con);
883 if (ret < 0)
884 return ret;
885 prepare_read_connect(con);
886 break;
887
888 case CEPH_MSGR_TAG_SEQ:
889 case CEPH_MSGR_TAG_READY:
890 if (req_feat & ~server_feat) {
891 pr_err("%s%lld %s protocol feature mismatch,"
892 " my required %llx > server's %llx, need %llx\n",
893 ENTITY_NAME(con->peer_name),
894 ceph_pr_addr(&con->peer_addr),
895 req_feat, server_feat, req_feat & ~server_feat);
896 con->error_msg = "missing required protocol features";
897 return -1;
898 }
899
900 WARN_ON(con->state != CEPH_CON_S_V1_CONNECT_MSG);
901 con->state = CEPH_CON_S_OPEN;
902 con->v1.auth_retry = 0; /* we authenticated; clear flag */
903 con->v1.peer_global_seq =
904 le32_to_cpu(con->v1.in_reply.global_seq);
905 con->v1.connect_seq++;
906 con->peer_features = server_feat;
907 dout("process_connect got READY gseq %d cseq %d (%d)\n",
908 con->v1.peer_global_seq,
909 le32_to_cpu(con->v1.in_reply.connect_seq),
910 con->v1.connect_seq);
911 WARN_ON(con->v1.connect_seq !=
912 le32_to_cpu(con->v1.in_reply.connect_seq));
913
914 if (con->v1.in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
915 ceph_con_flag_set(con, CEPH_CON_F_LOSSYTX);
916
917 con->delay = 0; /* reset backoff memory */
918
919 if (con->v1.in_reply.tag == CEPH_MSGR_TAG_SEQ) {
920 prepare_write_seq(con);
921 prepare_read_seq(con);
922 } else {
923 prepare_read_tag(con);
924 }
925 break;
926
927 case CEPH_MSGR_TAG_WAIT:
928 /*
929 * If there is a connection race (we are opening
930 * connections to each other), one of us may just have
931 * to WAIT. This shouldn't happen if we are the
932 * client.
933 */
934 con->error_msg = "protocol error, got WAIT as client";
935 return -1;
936
937 default:
938 con->error_msg = "protocol error, garbage tag during connect";
939 return -1;
940 }
941 return 0;
942}
943
944/*
945 * read (part of) an ack
946 */
947static int read_partial_ack(struct ceph_connection *con)
948{
949 int size = sizeof(con->v1.in_temp_ack);
950 int end = size;
951
952 return read_partial(con, end, size, &con->v1.in_temp_ack);
953}
954
955/*
956 * We can finally discard anything that's been acked.
957 */
958static void process_ack(struct ceph_connection *con)
959{
960 u64 ack = le64_to_cpu(con->v1.in_temp_ack);
961
962 if (con->v1.in_tag == CEPH_MSGR_TAG_ACK)
963 ceph_con_discard_sent(con, ack);
964 else
965 ceph_con_discard_requeued(con, ack);
966
967 prepare_read_tag(con);
968}
969
970static int read_partial_message_section(struct ceph_connection *con,
971 struct kvec *section,
972 unsigned int sec_len, u32 *crc)
973{
974 int ret, left;
975
976 BUG_ON(!section);
977
978 while (section->iov_len < sec_len) {
979 BUG_ON(section->iov_base == NULL);
980 left = sec_len - section->iov_len;
981 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
982 section->iov_len, left);
983 if (ret <= 0)
984 return ret;
985 section->iov_len += ret;
986 }
987 if (section->iov_len == sec_len)
988 *crc = crc32c(0, section->iov_base, section->iov_len);
989
990 return 1;
991}
992
993static int read_partial_msg_data(struct ceph_connection *con)
994{
995 struct ceph_msg *msg = con->in_msg;
996 struct ceph_msg_data_cursor *cursor = &msg->cursor;
997 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
998 struct page *page;
999 size_t page_offset;
1000 size_t length;
1001 u32 crc = 0;
1002 int ret;
1003
1004 if (!msg->num_data_items)
1005 return -EIO;
1006
1007 if (do_datacrc)
1008 crc = con->in_data_crc;
1009 while (cursor->total_resid) {
1010 if (!cursor->resid) {
1011 ceph_msg_data_advance(cursor, 0);
1012 continue;
1013 }
1014
1015 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
1016 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
1017 if (ret <= 0) {
1018 if (do_datacrc)
1019 con->in_data_crc = crc;
1020
1021 return ret;
1022 }
1023
1024 if (do_datacrc)
1025 crc = ceph_crc32c_page(crc, page, page_offset, ret);
1026 ceph_msg_data_advance(cursor, (size_t)ret);
1027 }
1028 if (do_datacrc)
1029 con->in_data_crc = crc;
1030
1031 return 1; /* must return > 0 to indicate success */
1032}
1033
1034/*
1035 * read (part of) a message.
1036 */
1037static int read_partial_message(struct ceph_connection *con)
1038{
1039 struct ceph_msg *m = con->in_msg;
1040 int size;
1041 int end;
1042 int ret;
1043 unsigned int front_len, middle_len, data_len;
1044 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1045 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
1046 u64 seq;
1047 u32 crc;
1048
1049 dout("read_partial_message con %p msg %p\n", con, m);
1050
1051 /* header */
1052 size = sizeof(con->v1.in_hdr);
1053 end = size;
1054 ret = read_partial(con, end, size, &con->v1.in_hdr);
1055 if (ret <= 0)
1056 return ret;
1057
1058 crc = crc32c(0, &con->v1.in_hdr, offsetof(struct ceph_msg_header, crc));
1059 if (cpu_to_le32(crc) != con->v1.in_hdr.crc) {
1060 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
1061 crc, con->v1.in_hdr.crc);
1062 return -EBADMSG;
1063 }
1064
1065 front_len = le32_to_cpu(con->v1.in_hdr.front_len);
1066 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1067 return -EIO;
1068 middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
1069 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
1070 return -EIO;
1071 data_len = le32_to_cpu(con->v1.in_hdr.data_len);
1072 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1073 return -EIO;
1074
1075 /* verify seq# */
1076 seq = le64_to_cpu(con->v1.in_hdr.seq);
1077 if ((s64)seq - (s64)con->in_seq < 1) {
1078 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1079 ENTITY_NAME(con->peer_name),
1080 ceph_pr_addr(&con->peer_addr),
1081 seq, con->in_seq + 1);
1082 con->v1.in_base_pos = -front_len - middle_len - data_len -
1083 sizeof_footer(con);
1084 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1085 return 1;
1086 } else if ((s64)seq - (s64)con->in_seq > 1) {
1087 pr_err("read_partial_message bad seq %lld expected %lld\n",
1088 seq, con->in_seq + 1);
1089 con->error_msg = "bad message sequence # for incoming message";
1090 return -EBADE;
1091 }
1092
1093 /* allocate message? */
1094 if (!con->in_msg) {
1095 int skip = 0;
1096
1097 dout("got hdr type %d front %d data %d\n", con->v1.in_hdr.type,
1098 front_len, data_len);
1099 ret = ceph_con_in_msg_alloc(con, &con->v1.in_hdr, &skip);
1100 if (ret < 0)
1101 return ret;
1102
1103 BUG_ON((!con->in_msg) ^ skip);
1104 if (skip) {
1105 /* skip this message */
1106 dout("alloc_msg said skip message\n");
1107 con->v1.in_base_pos = -front_len - middle_len -
1108 data_len - sizeof_footer(con);
1109 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1110 con->in_seq++;
1111 return 1;
1112 }
1113
1114 BUG_ON(!con->in_msg);
1115 BUG_ON(con->in_msg->con != con);
1116 m = con->in_msg;
1117 m->front.iov_len = 0; /* haven't read it yet */
1118 if (m->middle)
1119 m->middle->vec.iov_len = 0;
1120
1121 /* prepare for data payload, if any */
1122
1123 if (data_len)
1124 prepare_message_data(con->in_msg, data_len);
1125 }
1126
1127 /* front */
1128 ret = read_partial_message_section(con, &m->front, front_len,
1129 &con->in_front_crc);
1130 if (ret <= 0)
1131 return ret;
1132
1133 /* middle */
1134 if (m->middle) {
1135 ret = read_partial_message_section(con, &m->middle->vec,
1136 middle_len,
1137 &con->in_middle_crc);
1138 if (ret <= 0)
1139 return ret;
1140 }
1141
1142 /* (page) data */
1143 if (data_len) {
1144 ret = read_partial_msg_data(con);
1145 if (ret <= 0)
1146 return ret;
1147 }
1148
1149 /* footer */
1150 size = sizeof_footer(con);
1151 end += size;
1152 ret = read_partial(con, end, size, &m->footer);
1153 if (ret <= 0)
1154 return ret;
1155
1156 if (!need_sign) {
1157 m->footer.flags = m->old_footer.flags;
1158 m->footer.sig = 0;
1159 }
1160
1161 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1162 m, front_len, m->footer.front_crc, middle_len,
1163 m->footer.middle_crc, data_len, m->footer.data_crc);
1164
1165 /* crc ok? */
1166 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1167 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1168 m, con->in_front_crc, m->footer.front_crc);
1169 return -EBADMSG;
1170 }
1171 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1172 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1173 m, con->in_middle_crc, m->footer.middle_crc);
1174 return -EBADMSG;
1175 }
1176 if (do_datacrc &&
1177 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1178 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1179 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1180 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1181 return -EBADMSG;
1182 }
1183
1184 if (need_sign && con->ops->check_message_signature &&
1185 con->ops->check_message_signature(m)) {
1186 pr_err("read_partial_message %p signature check failed\n", m);
1187 return -EBADMSG;
1188 }
1189
1190 return 1; /* done! */
1191}
1192
1193static int read_keepalive_ack(struct ceph_connection *con)
1194{
1195 struct ceph_timespec ceph_ts;
1196 size_t size = sizeof(ceph_ts);
1197 int ret = read_partial(con, size, size, &ceph_ts);
1198 if (ret <= 0)
1199 return ret;
1200 ceph_decode_timespec64(&con->last_keepalive_ack, &ceph_ts);
1201 prepare_read_tag(con);
1202 return 1;
1203}
1204
1205/*
1206 * Read what we can from the socket.
1207 */
1208int ceph_con_v1_try_read(struct ceph_connection *con)
1209{
1210 int ret = -1;
1211
1212more:
1213 dout("try_read start %p state %d\n", con, con->state);
1214 if (con->state != CEPH_CON_S_V1_BANNER &&
1215 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
1216 con->state != CEPH_CON_S_OPEN)
1217 return 0;
1218
1219 BUG_ON(!con->sock);
1220
1221 dout("try_read tag %d in_base_pos %d\n", con->v1.in_tag,
1222 con->v1.in_base_pos);
1223
1224 if (con->state == CEPH_CON_S_V1_BANNER) {
1225 ret = read_partial_banner(con);
1226 if (ret <= 0)
1227 goto out;
1228 ret = process_banner(con);
1229 if (ret < 0)
1230 goto out;
1231
1232 con->state = CEPH_CON_S_V1_CONNECT_MSG;
1233
1234 /*
1235 * Received banner is good, exchange connection info.
1236 * Do not reset out_kvec, as sending our banner raced
1237 * with receiving peer banner after connect completed.
1238 */
1239 ret = prepare_write_connect(con);
1240 if (ret < 0)
1241 goto out;
1242 prepare_read_connect(con);
1243
1244 /* Send connection info before awaiting response */
1245 goto out;
1246 }
1247
1248 if (con->state == CEPH_CON_S_V1_CONNECT_MSG) {
1249 ret = read_partial_connect(con);
1250 if (ret <= 0)
1251 goto out;
1252 ret = process_connect(con);
1253 if (ret < 0)
1254 goto out;
1255 goto more;
1256 }
1257
1258 WARN_ON(con->state != CEPH_CON_S_OPEN);
1259
1260 if (con->v1.in_base_pos < 0) {
1261 /*
1262 * skipping + discarding content.
1263 */
1264 ret = ceph_tcp_recvmsg(con->sock, NULL, -con->v1.in_base_pos);
1265 if (ret <= 0)
1266 goto out;
1267 dout("skipped %d / %d bytes\n", ret, -con->v1.in_base_pos);
1268 con->v1.in_base_pos += ret;
1269 if (con->v1.in_base_pos)
1270 goto more;
1271 }
1272 if (con->v1.in_tag == CEPH_MSGR_TAG_READY) {
1273 /*
1274 * what's next?
1275 */
1276 ret = ceph_tcp_recvmsg(con->sock, &con->v1.in_tag, 1);
1277 if (ret <= 0)
1278 goto out;
1279 dout("try_read got tag %d\n", con->v1.in_tag);
1280 switch (con->v1.in_tag) {
1281 case CEPH_MSGR_TAG_MSG:
1282 prepare_read_message(con);
1283 break;
1284 case CEPH_MSGR_TAG_ACK:
1285 prepare_read_ack(con);
1286 break;
1287 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
1288 prepare_read_keepalive_ack(con);
1289 break;
1290 case CEPH_MSGR_TAG_CLOSE:
1291 ceph_con_close_socket(con);
1292 con->state = CEPH_CON_S_CLOSED;
1293 goto out;
1294 default:
1295 goto bad_tag;
1296 }
1297 }
1298 if (con->v1.in_tag == CEPH_MSGR_TAG_MSG) {
1299 ret = read_partial_message(con);
1300 if (ret <= 0) {
1301 switch (ret) {
1302 case -EBADMSG:
1303 con->error_msg = "bad crc/signature";
1304 fallthrough;
1305 case -EBADE:
1306 ret = -EIO;
1307 break;
1308 case -EIO:
1309 con->error_msg = "io error";
1310 break;
1311 }
1312 goto out;
1313 }
1314 if (con->v1.in_tag == CEPH_MSGR_TAG_READY)
1315 goto more;
1316 ceph_con_process_message(con);
1317 if (con->state == CEPH_CON_S_OPEN)
1318 prepare_read_tag(con);
1319 goto more;
1320 }
1321 if (con->v1.in_tag == CEPH_MSGR_TAG_ACK ||
1322 con->v1.in_tag == CEPH_MSGR_TAG_SEQ) {
1323 /*
1324 * the final handshake seq exchange is semantically
1325 * equivalent to an ACK
1326 */
1327 ret = read_partial_ack(con);
1328 if (ret <= 0)
1329 goto out;
1330 process_ack(con);
1331 goto more;
1332 }
1333 if (con->v1.in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
1334 ret = read_keepalive_ack(con);
1335 if (ret <= 0)
1336 goto out;
1337 goto more;
1338 }
1339
1340out:
1341 dout("try_read done on %p ret %d\n", con, ret);
1342 return ret;
1343
1344bad_tag:
1345 pr_err("try_read bad tag %d\n", con->v1.in_tag);
1346 con->error_msg = "protocol error, garbage tag";
1347 ret = -1;
1348 goto out;
1349}
1350
1351/*
1352 * Write something to the socket. Called in a worker thread when the
1353 * socket appears to be writeable and we have something ready to send.
1354 */
1355int ceph_con_v1_try_write(struct ceph_connection *con)
1356{
1357 int ret = 1;
1358
1359 dout("try_write start %p state %d\n", con, con->state);
1360 if (con->state != CEPH_CON_S_PREOPEN &&
1361 con->state != CEPH_CON_S_V1_BANNER &&
1362 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
1363 con->state != CEPH_CON_S_OPEN)
1364 return 0;
1365
1366 /* open the socket first? */
1367 if (con->state == CEPH_CON_S_PREOPEN) {
1368 BUG_ON(con->sock);
1369 con->state = CEPH_CON_S_V1_BANNER;
1370
1371 con_out_kvec_reset(con);
1372 prepare_write_banner(con);
1373 prepare_read_banner(con);
1374
1375 BUG_ON(con->in_msg);
1376 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1377 dout("try_write initiating connect on %p new state %d\n",
1378 con, con->state);
1379 ret = ceph_tcp_connect(con);
1380 if (ret < 0) {
1381 con->error_msg = "connect error";
1382 goto out;
1383 }
1384 }
1385
1386more:
1387 dout("try_write out_kvec_bytes %d\n", con->v1.out_kvec_bytes);
1388 BUG_ON(!con->sock);
1389
1390 /* kvec data queued? */
1391 if (con->v1.out_kvec_left) {
1392 ret = write_partial_kvec(con);
1393 if (ret <= 0)
1394 goto out;
1395 }
1396 if (con->v1.out_skip) {
1397 ret = write_partial_skip(con);
1398 if (ret <= 0)
1399 goto out;
1400 }
1401
1402 /* msg pages? */
1403 if (con->out_msg) {
1404 if (con->v1.out_msg_done) {
1405 ceph_msg_put(con->out_msg);
1406 con->out_msg = NULL; /* we're done with this one */
1407 goto do_next;
1408 }
1409
1410 ret = write_partial_message_data(con);
1411 if (ret == 1)
1412 goto more; /* we need to send the footer, too! */
1413 if (ret == 0)
1414 goto out;
1415 if (ret < 0) {
1416 dout("try_write write_partial_message_data err %d\n",
1417 ret);
1418 goto out;
1419 }
1420 }
1421
1422do_next:
1423 if (con->state == CEPH_CON_S_OPEN) {
1424 if (ceph_con_flag_test_and_clear(con,
1425 CEPH_CON_F_KEEPALIVE_PENDING)) {
1426 prepare_write_keepalive(con);
1427 goto more;
1428 }
1429 /* is anything else pending? */
1430 if (!list_empty(&con->out_queue)) {
1431 prepare_write_message(con);
1432 goto more;
1433 }
1434 if (con->in_seq > con->in_seq_acked) {
1435 prepare_write_ack(con);
1436 goto more;
1437 }
1438 }
1439
1440 /* Nothing to do! */
1441 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING);
1442 dout("try_write nothing else to write.\n");
1443 ret = 0;
1444out:
1445 dout("try_write done on %p ret %d\n", con, ret);
1446 return ret;
1447}
1448
1449void ceph_con_v1_revoke(struct ceph_connection *con)
1450{
1451 struct ceph_msg *msg = con->out_msg;
1452
1453 WARN_ON(con->v1.out_skip);
1454 /* footer */
1455 if (con->v1.out_msg_done) {
1456 con->v1.out_skip += con_out_kvec_skip(con);
1457 } else {
1458 WARN_ON(!msg->data_length);
1459 con->v1.out_skip += sizeof_footer(con);
1460 }
1461 /* data, middle, front */
1462 if (msg->data_length)
1463 con->v1.out_skip += msg->cursor.total_resid;
1464 if (msg->middle)
1465 con->v1.out_skip += con_out_kvec_skip(con);
1466 con->v1.out_skip += con_out_kvec_skip(con);
1467
1468 dout("%s con %p out_kvec_bytes %d out_skip %d\n", __func__, con,
1469 con->v1.out_kvec_bytes, con->v1.out_skip);
1470}
1471
1472void ceph_con_v1_revoke_incoming(struct ceph_connection *con)
1473{
1474 unsigned int front_len = le32_to_cpu(con->v1.in_hdr.front_len);
1475 unsigned int middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
1476 unsigned int data_len = le32_to_cpu(con->v1.in_hdr.data_len);
1477
1478 /* skip rest of message */
1479 con->v1.in_base_pos = con->v1.in_base_pos -
1480 sizeof(struct ceph_msg_header) -
1481 front_len -
1482 middle_len -
1483 data_len -
1484 sizeof(struct ceph_msg_footer);
1485
1486 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1487 con->in_seq++;
1488
1489 dout("%s con %p in_base_pos %d\n", __func__, con, con->v1.in_base_pos);
1490}
1491
1492bool ceph_con_v1_opened(struct ceph_connection *con)
1493{
1494 return con->v1.connect_seq;
1495}
1496
1497void ceph_con_v1_reset_session(struct ceph_connection *con)
1498{
1499 con->v1.connect_seq = 0;
1500 con->v1.peer_global_seq = 0;
1501}
1502
1503void ceph_con_v1_reset_protocol(struct ceph_connection *con)
1504{
1505 con->v1.out_skip = 0;
1506}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/bvec.h>
5#include <linux/crc32c.h>
6#include <linux/net.h>
7#include <linux/socket.h>
8#include <net/sock.h>
9
10#include <linux/ceph/ceph_features.h>
11#include <linux/ceph/decode.h>
12#include <linux/ceph/libceph.h>
13#include <linux/ceph/messenger.h>
14
15/* static tag bytes (protocol control messages) */
16static char tag_msg = CEPH_MSGR_TAG_MSG;
17static char tag_ack = CEPH_MSGR_TAG_ACK;
18static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
19static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
20
21/*
22 * If @buf is NULL, discard up to @len bytes.
23 */
24static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
25{
26 struct kvec iov = {buf, len};
27 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
28 int r;
29
30 if (!buf)
31 msg.msg_flags |= MSG_TRUNC;
32
33 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len);
34 r = sock_recvmsg(sock, &msg, msg.msg_flags);
35 if (r == -EAGAIN)
36 r = 0;
37 return r;
38}
39
40static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
41 int page_offset, size_t length)
42{
43 struct bio_vec bvec;
44 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
45 int r;
46
47 BUG_ON(page_offset + length > PAGE_SIZE);
48 bvec_set_page(&bvec, page, length, page_offset);
49 iov_iter_bvec(&msg.msg_iter, ITER_DEST, &bvec, 1, length);
50 r = sock_recvmsg(sock, &msg, msg.msg_flags);
51 if (r == -EAGAIN)
52 r = 0;
53 return r;
54}
55
56/*
57 * write something. @more is true if caller will be sending more data
58 * shortly.
59 */
60static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
61 size_t kvlen, size_t len, bool more)
62{
63 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
64 int r;
65
66 if (more)
67 msg.msg_flags |= MSG_MORE;
68 else
69 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
70
71 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
72 if (r == -EAGAIN)
73 r = 0;
74 return r;
75}
76
77/*
78 * @more: MSG_MORE or 0.
79 */
80static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
81 int offset, size_t size, int more)
82{
83 struct msghdr msg = {
84 .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL | more,
85 };
86 struct bio_vec bvec;
87 int ret;
88
89 /*
90 * MSG_SPLICE_PAGES cannot properly handle pages with page_count == 0,
91 * we need to fall back to sendmsg if that's the case.
92 *
93 * Same goes for slab pages: skb_can_coalesce() allows
94 * coalescing neighboring slab objects into a single frag which
95 * triggers one of hardened usercopy checks.
96 */
97 if (sendpage_ok(page))
98 msg.msg_flags |= MSG_SPLICE_PAGES;
99
100 bvec_set_page(&bvec, page, size, offset);
101 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
102
103 ret = sock_sendmsg(sock, &msg);
104 if (ret == -EAGAIN)
105 ret = 0;
106
107 return ret;
108}
109
110static void con_out_kvec_reset(struct ceph_connection *con)
111{
112 BUG_ON(con->v1.out_skip);
113
114 con->v1.out_kvec_left = 0;
115 con->v1.out_kvec_bytes = 0;
116 con->v1.out_kvec_cur = &con->v1.out_kvec[0];
117}
118
119static void con_out_kvec_add(struct ceph_connection *con,
120 size_t size, void *data)
121{
122 int index = con->v1.out_kvec_left;
123
124 BUG_ON(con->v1.out_skip);
125 BUG_ON(index >= ARRAY_SIZE(con->v1.out_kvec));
126
127 con->v1.out_kvec[index].iov_len = size;
128 con->v1.out_kvec[index].iov_base = data;
129 con->v1.out_kvec_left++;
130 con->v1.out_kvec_bytes += size;
131}
132
133/*
134 * Chop off a kvec from the end. Return residual number of bytes for
135 * that kvec, i.e. how many bytes would have been written if the kvec
136 * hadn't been nuked.
137 */
138static int con_out_kvec_skip(struct ceph_connection *con)
139{
140 int skip = 0;
141
142 if (con->v1.out_kvec_bytes > 0) {
143 skip = con->v1.out_kvec_cur[con->v1.out_kvec_left - 1].iov_len;
144 BUG_ON(con->v1.out_kvec_bytes < skip);
145 BUG_ON(!con->v1.out_kvec_left);
146 con->v1.out_kvec_bytes -= skip;
147 con->v1.out_kvec_left--;
148 }
149
150 return skip;
151}
152
153static size_t sizeof_footer(struct ceph_connection *con)
154{
155 return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
156 sizeof(struct ceph_msg_footer) :
157 sizeof(struct ceph_msg_footer_old);
158}
159
160static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
161{
162 /* Initialize data cursor if it's not a sparse read */
163 u64 len = msg->sparse_read_total ? : data_len;
164
165 ceph_msg_data_cursor_init(&msg->cursor, msg, len);
166}
167
168/*
169 * Prepare footer for currently outgoing message, and finish things
170 * off. Assumes out_kvec* are already valid.. we just add on to the end.
171 */
172static void prepare_write_message_footer(struct ceph_connection *con)
173{
174 struct ceph_msg *m = con->out_msg;
175
176 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
177
178 dout("prepare_write_message_footer %p\n", con);
179 con_out_kvec_add(con, sizeof_footer(con), &m->footer);
180 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
181 if (con->ops->sign_message)
182 con->ops->sign_message(m);
183 else
184 m->footer.sig = 0;
185 } else {
186 m->old_footer.flags = m->footer.flags;
187 }
188 con->v1.out_more = m->more_to_follow;
189 con->v1.out_msg_done = true;
190}
191
192/*
193 * Prepare headers for the next outgoing message.
194 */
195static void prepare_write_message(struct ceph_connection *con)
196{
197 struct ceph_msg *m;
198 u32 crc;
199
200 con_out_kvec_reset(con);
201 con->v1.out_msg_done = false;
202
203 /* Sneak an ack in there first? If we can get it into the same
204 * TCP packet that's a good thing. */
205 if (con->in_seq > con->in_seq_acked) {
206 con->in_seq_acked = con->in_seq;
207 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
208 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
209 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
210 &con->v1.out_temp_ack);
211 }
212
213 ceph_con_get_out_msg(con);
214 m = con->out_msg;
215
216 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
217 m, con->out_seq, le16_to_cpu(m->hdr.type),
218 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
219 m->data_length);
220 WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));
221 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
222
223 /* tag + hdr + front + middle */
224 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
225 con_out_kvec_add(con, sizeof(con->v1.out_hdr), &con->v1.out_hdr);
226 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
227
228 if (m->middle)
229 con_out_kvec_add(con, m->middle->vec.iov_len,
230 m->middle->vec.iov_base);
231
232 /* fill in hdr crc and finalize hdr */
233 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
234 con->out_msg->hdr.crc = cpu_to_le32(crc);
235 memcpy(&con->v1.out_hdr, &con->out_msg->hdr, sizeof(con->v1.out_hdr));
236
237 /* fill in front and middle crc, footer */
238 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
239 con->out_msg->footer.front_crc = cpu_to_le32(crc);
240 if (m->middle) {
241 crc = crc32c(0, m->middle->vec.iov_base,
242 m->middle->vec.iov_len);
243 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
244 } else
245 con->out_msg->footer.middle_crc = 0;
246 dout("%s front_crc %u middle_crc %u\n", __func__,
247 le32_to_cpu(con->out_msg->footer.front_crc),
248 le32_to_cpu(con->out_msg->footer.middle_crc));
249 con->out_msg->footer.flags = 0;
250
251 /* is there a data payload? */
252 con->out_msg->footer.data_crc = 0;
253 if (m->data_length) {
254 prepare_message_data(con->out_msg, m->data_length);
255 con->v1.out_more = 1; /* data + footer will follow */
256 } else {
257 /* no, queue up footer too and be done */
258 prepare_write_message_footer(con);
259 }
260
261 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
262}
263
264/*
265 * Prepare an ack.
266 */
267static void prepare_write_ack(struct ceph_connection *con)
268{
269 dout("prepare_write_ack %p %llu -> %llu\n", con,
270 con->in_seq_acked, con->in_seq);
271 con->in_seq_acked = con->in_seq;
272
273 con_out_kvec_reset(con);
274
275 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
276
277 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
278 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
279 &con->v1.out_temp_ack);
280
281 con->v1.out_more = 1; /* more will follow.. eventually.. */
282 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
283}
284
285/*
286 * Prepare to share the seq during handshake
287 */
288static void prepare_write_seq(struct ceph_connection *con)
289{
290 dout("prepare_write_seq %p %llu -> %llu\n", con,
291 con->in_seq_acked, con->in_seq);
292 con->in_seq_acked = con->in_seq;
293
294 con_out_kvec_reset(con);
295
296 con->v1.out_temp_ack = cpu_to_le64(con->in_seq_acked);
297 con_out_kvec_add(con, sizeof(con->v1.out_temp_ack),
298 &con->v1.out_temp_ack);
299
300 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
301}
302
303/*
304 * Prepare to write keepalive byte.
305 */
306static void prepare_write_keepalive(struct ceph_connection *con)
307{
308 dout("prepare_write_keepalive %p\n", con);
309 con_out_kvec_reset(con);
310 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
311 struct timespec64 now;
312
313 ktime_get_real_ts64(&now);
314 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
315 ceph_encode_timespec64(&con->v1.out_temp_keepalive2, &now);
316 con_out_kvec_add(con, sizeof(con->v1.out_temp_keepalive2),
317 &con->v1.out_temp_keepalive2);
318 } else {
319 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
320 }
321 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
322}
323
324/*
325 * Connection negotiation.
326 */
327
328static int get_connect_authorizer(struct ceph_connection *con)
329{
330 struct ceph_auth_handshake *auth;
331 int auth_proto;
332
333 if (!con->ops->get_authorizer) {
334 con->v1.auth = NULL;
335 con->v1.out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
336 con->v1.out_connect.authorizer_len = 0;
337 return 0;
338 }
339
340 auth = con->ops->get_authorizer(con, &auth_proto, con->v1.auth_retry);
341 if (IS_ERR(auth))
342 return PTR_ERR(auth);
343
344 con->v1.auth = auth;
345 con->v1.out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
346 con->v1.out_connect.authorizer_len =
347 cpu_to_le32(auth->authorizer_buf_len);
348 return 0;
349}
350
351/*
352 * We connected to a peer and are saying hello.
353 */
354static void prepare_write_banner(struct ceph_connection *con)
355{
356 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
357 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
358 &con->msgr->my_enc_addr);
359
360 con->v1.out_more = 0;
361 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
362}
363
364static void __prepare_write_connect(struct ceph_connection *con)
365{
366 con_out_kvec_add(con, sizeof(con->v1.out_connect),
367 &con->v1.out_connect);
368 if (con->v1.auth)
369 con_out_kvec_add(con, con->v1.auth->authorizer_buf_len,
370 con->v1.auth->authorizer_buf);
371
372 con->v1.out_more = 0;
373 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
374}
375
376static int prepare_write_connect(struct ceph_connection *con)
377{
378 unsigned int global_seq = ceph_get_global_seq(con->msgr, 0);
379 int proto;
380 int ret;
381
382 switch (con->peer_name.type) {
383 case CEPH_ENTITY_TYPE_MON:
384 proto = CEPH_MONC_PROTOCOL;
385 break;
386 case CEPH_ENTITY_TYPE_OSD:
387 proto = CEPH_OSDC_PROTOCOL;
388 break;
389 case CEPH_ENTITY_TYPE_MDS:
390 proto = CEPH_MDSC_PROTOCOL;
391 break;
392 default:
393 BUG();
394 }
395
396 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
397 con->v1.connect_seq, global_seq, proto);
398
399 con->v1.out_connect.features =
400 cpu_to_le64(from_msgr(con->msgr)->supported_features);
401 con->v1.out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
402 con->v1.out_connect.connect_seq = cpu_to_le32(con->v1.connect_seq);
403 con->v1.out_connect.global_seq = cpu_to_le32(global_seq);
404 con->v1.out_connect.protocol_version = cpu_to_le32(proto);
405 con->v1.out_connect.flags = 0;
406
407 ret = get_connect_authorizer(con);
408 if (ret)
409 return ret;
410
411 __prepare_write_connect(con);
412 return 0;
413}
414
415/*
416 * write as much of pending kvecs to the socket as we can.
417 * 1 -> done
418 * 0 -> socket full, but more to do
419 * <0 -> error
420 */
421static int write_partial_kvec(struct ceph_connection *con)
422{
423 int ret;
424
425 dout("write_partial_kvec %p %d left\n", con, con->v1.out_kvec_bytes);
426 while (con->v1.out_kvec_bytes > 0) {
427 ret = ceph_tcp_sendmsg(con->sock, con->v1.out_kvec_cur,
428 con->v1.out_kvec_left,
429 con->v1.out_kvec_bytes,
430 con->v1.out_more);
431 if (ret <= 0)
432 goto out;
433 con->v1.out_kvec_bytes -= ret;
434 if (!con->v1.out_kvec_bytes)
435 break; /* done */
436
437 /* account for full iov entries consumed */
438 while (ret >= con->v1.out_kvec_cur->iov_len) {
439 BUG_ON(!con->v1.out_kvec_left);
440 ret -= con->v1.out_kvec_cur->iov_len;
441 con->v1.out_kvec_cur++;
442 con->v1.out_kvec_left--;
443 }
444 /* and for a partially-consumed entry */
445 if (ret) {
446 con->v1.out_kvec_cur->iov_len -= ret;
447 con->v1.out_kvec_cur->iov_base += ret;
448 }
449 }
450 con->v1.out_kvec_left = 0;
451 ret = 1;
452out:
453 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
454 con->v1.out_kvec_bytes, con->v1.out_kvec_left, ret);
455 return ret; /* done! */
456}
457
458/*
459 * Write as much message data payload as we can. If we finish, queue
460 * up the footer.
461 * 1 -> done, footer is now queued in out_kvec[].
462 * 0 -> socket full, but more to do
463 * <0 -> error
464 */
465static int write_partial_message_data(struct ceph_connection *con)
466{
467 struct ceph_msg *msg = con->out_msg;
468 struct ceph_msg_data_cursor *cursor = &msg->cursor;
469 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
470 u32 crc;
471
472 dout("%s %p msg %p\n", __func__, con, msg);
473
474 if (!msg->num_data_items)
475 return -EINVAL;
476
477 /*
478 * Iterate through each page that contains data to be
479 * written, and send as much as possible for each.
480 *
481 * If we are calculating the data crc (the default), we will
482 * need to map the page. If we have no pages, they have
483 * been revoked, so use the zero page.
484 */
485 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
486 while (cursor->total_resid) {
487 struct page *page;
488 size_t page_offset;
489 size_t length;
490 int ret;
491
492 if (!cursor->resid) {
493 ceph_msg_data_advance(cursor, 0);
494 continue;
495 }
496
497 page = ceph_msg_data_next(cursor, &page_offset, &length);
498 ret = ceph_tcp_sendpage(con->sock, page, page_offset, length,
499 MSG_MORE);
500 if (ret <= 0) {
501 if (do_datacrc)
502 msg->footer.data_crc = cpu_to_le32(crc);
503
504 return ret;
505 }
506 if (do_datacrc && cursor->need_crc)
507 crc = ceph_crc32c_page(crc, page, page_offset, length);
508 ceph_msg_data_advance(cursor, (size_t)ret);
509 }
510
511 dout("%s %p msg %p done\n", __func__, con, msg);
512
513 /* prepare and queue up footer, too */
514 if (do_datacrc)
515 msg->footer.data_crc = cpu_to_le32(crc);
516 else
517 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
518 con_out_kvec_reset(con);
519 prepare_write_message_footer(con);
520
521 return 1; /* must return > 0 to indicate success */
522}
523
524/*
525 * write some zeros
526 */
527static int write_partial_skip(struct ceph_connection *con)
528{
529 int ret;
530
531 dout("%s %p %d left\n", __func__, con, con->v1.out_skip);
532 while (con->v1.out_skip > 0) {
533 size_t size = min(con->v1.out_skip, (int)PAGE_SIZE);
534
535 ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size,
536 MSG_MORE);
537 if (ret <= 0)
538 goto out;
539 con->v1.out_skip -= ret;
540 }
541 ret = 1;
542out:
543 return ret;
544}
545
546/*
547 * Prepare to read connection handshake, or an ack.
548 */
549static void prepare_read_banner(struct ceph_connection *con)
550{
551 dout("prepare_read_banner %p\n", con);
552 con->v1.in_base_pos = 0;
553}
554
555static void prepare_read_connect(struct ceph_connection *con)
556{
557 dout("prepare_read_connect %p\n", con);
558 con->v1.in_base_pos = 0;
559}
560
561static void prepare_read_ack(struct ceph_connection *con)
562{
563 dout("prepare_read_ack %p\n", con);
564 con->v1.in_base_pos = 0;
565}
566
567static void prepare_read_seq(struct ceph_connection *con)
568{
569 dout("prepare_read_seq %p\n", con);
570 con->v1.in_base_pos = 0;
571 con->v1.in_tag = CEPH_MSGR_TAG_SEQ;
572}
573
574static void prepare_read_tag(struct ceph_connection *con)
575{
576 dout("prepare_read_tag %p\n", con);
577 con->v1.in_base_pos = 0;
578 con->v1.in_tag = CEPH_MSGR_TAG_READY;
579}
580
581static void prepare_read_keepalive_ack(struct ceph_connection *con)
582{
583 dout("prepare_read_keepalive_ack %p\n", con);
584 con->v1.in_base_pos = 0;
585}
586
587/*
588 * Prepare to read a message.
589 */
590static int prepare_read_message(struct ceph_connection *con)
591{
592 dout("prepare_read_message %p\n", con);
593 BUG_ON(con->in_msg != NULL);
594 con->v1.in_base_pos = 0;
595 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
596 return 0;
597}
598
599static int read_partial(struct ceph_connection *con,
600 int end, int size, void *object)
601{
602 while (con->v1.in_base_pos < end) {
603 int left = end - con->v1.in_base_pos;
604 int have = size - left;
605 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
606 if (ret <= 0)
607 return ret;
608 con->v1.in_base_pos += ret;
609 }
610 return 1;
611}
612
613/*
614 * Read all or part of the connect-side handshake on a new connection
615 */
616static int read_partial_banner(struct ceph_connection *con)
617{
618 int size;
619 int end;
620 int ret;
621
622 dout("read_partial_banner %p at %d\n", con, con->v1.in_base_pos);
623
624 /* peer's banner */
625 size = strlen(CEPH_BANNER);
626 end = size;
627 ret = read_partial(con, end, size, con->v1.in_banner);
628 if (ret <= 0)
629 goto out;
630
631 size = sizeof(con->v1.actual_peer_addr);
632 end += size;
633 ret = read_partial(con, end, size, &con->v1.actual_peer_addr);
634 if (ret <= 0)
635 goto out;
636 ceph_decode_banner_addr(&con->v1.actual_peer_addr);
637
638 size = sizeof(con->v1.peer_addr_for_me);
639 end += size;
640 ret = read_partial(con, end, size, &con->v1.peer_addr_for_me);
641 if (ret <= 0)
642 goto out;
643 ceph_decode_banner_addr(&con->v1.peer_addr_for_me);
644
645out:
646 return ret;
647}
648
649static int read_partial_connect(struct ceph_connection *con)
650{
651 int size;
652 int end;
653 int ret;
654
655 dout("read_partial_connect %p at %d\n", con, con->v1.in_base_pos);
656
657 size = sizeof(con->v1.in_reply);
658 end = size;
659 ret = read_partial(con, end, size, &con->v1.in_reply);
660 if (ret <= 0)
661 goto out;
662
663 if (con->v1.auth) {
664 size = le32_to_cpu(con->v1.in_reply.authorizer_len);
665 if (size > con->v1.auth->authorizer_reply_buf_len) {
666 pr_err("authorizer reply too big: %d > %zu\n", size,
667 con->v1.auth->authorizer_reply_buf_len);
668 ret = -EINVAL;
669 goto out;
670 }
671
672 end += size;
673 ret = read_partial(con, end, size,
674 con->v1.auth->authorizer_reply_buf);
675 if (ret <= 0)
676 goto out;
677 }
678
679 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
680 con, con->v1.in_reply.tag,
681 le32_to_cpu(con->v1.in_reply.connect_seq),
682 le32_to_cpu(con->v1.in_reply.global_seq));
683out:
684 return ret;
685}
686
687/*
688 * Verify the hello banner looks okay.
689 */
690static int verify_hello(struct ceph_connection *con)
691{
692 if (memcmp(con->v1.in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
693 pr_err("connect to %s got bad banner\n",
694 ceph_pr_addr(&con->peer_addr));
695 con->error_msg = "protocol error, bad banner";
696 return -1;
697 }
698 return 0;
699}
700
701static int process_banner(struct ceph_connection *con)
702{
703 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
704
705 dout("process_banner on %p\n", con);
706
707 if (verify_hello(con) < 0)
708 return -1;
709
710 /*
711 * Make sure the other end is who we wanted. note that the other
712 * end may not yet know their ip address, so if it's 0.0.0.0, give
713 * them the benefit of the doubt.
714 */
715 if (memcmp(&con->peer_addr, &con->v1.actual_peer_addr,
716 sizeof(con->peer_addr)) != 0 &&
717 !(ceph_addr_is_blank(&con->v1.actual_peer_addr) &&
718 con->v1.actual_peer_addr.nonce == con->peer_addr.nonce)) {
719 pr_warn("wrong peer, want %s/%u, got %s/%u\n",
720 ceph_pr_addr(&con->peer_addr),
721 le32_to_cpu(con->peer_addr.nonce),
722 ceph_pr_addr(&con->v1.actual_peer_addr),
723 le32_to_cpu(con->v1.actual_peer_addr.nonce));
724 con->error_msg = "wrong peer at address";
725 return -1;
726 }
727
728 /*
729 * did we learn our address?
730 */
731 if (ceph_addr_is_blank(my_addr)) {
732 memcpy(&my_addr->in_addr,
733 &con->v1.peer_addr_for_me.in_addr,
734 sizeof(con->v1.peer_addr_for_me.in_addr));
735 ceph_addr_set_port(my_addr, 0);
736 ceph_encode_my_addr(con->msgr);
737 dout("process_banner learned my addr is %s\n",
738 ceph_pr_addr(my_addr));
739 }
740
741 return 0;
742}
743
744static int process_connect(struct ceph_connection *con)
745{
746 u64 sup_feat = from_msgr(con->msgr)->supported_features;
747 u64 req_feat = from_msgr(con->msgr)->required_features;
748 u64 server_feat = le64_to_cpu(con->v1.in_reply.features);
749 int ret;
750
751 dout("process_connect on %p tag %d\n", con, con->v1.in_tag);
752
753 if (con->v1.auth) {
754 int len = le32_to_cpu(con->v1.in_reply.authorizer_len);
755
756 /*
757 * Any connection that defines ->get_authorizer()
758 * should also define ->add_authorizer_challenge() and
759 * ->verify_authorizer_reply().
760 *
761 * See get_connect_authorizer().
762 */
763 if (con->v1.in_reply.tag ==
764 CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
765 ret = con->ops->add_authorizer_challenge(
766 con, con->v1.auth->authorizer_reply_buf, len);
767 if (ret < 0)
768 return ret;
769
770 con_out_kvec_reset(con);
771 __prepare_write_connect(con);
772 prepare_read_connect(con);
773 return 0;
774 }
775
776 if (len) {
777 ret = con->ops->verify_authorizer_reply(con);
778 if (ret < 0) {
779 con->error_msg = "bad authorize reply";
780 return ret;
781 }
782 }
783 }
784
785 switch (con->v1.in_reply.tag) {
786 case CEPH_MSGR_TAG_FEATURES:
787 pr_err("%s%lld %s feature set mismatch,"
788 " my %llx < server's %llx, missing %llx\n",
789 ENTITY_NAME(con->peer_name),
790 ceph_pr_addr(&con->peer_addr),
791 sup_feat, server_feat, server_feat & ~sup_feat);
792 con->error_msg = "missing required protocol features";
793 return -1;
794
795 case CEPH_MSGR_TAG_BADPROTOVER:
796 pr_err("%s%lld %s protocol version mismatch,"
797 " my %d != server's %d\n",
798 ENTITY_NAME(con->peer_name),
799 ceph_pr_addr(&con->peer_addr),
800 le32_to_cpu(con->v1.out_connect.protocol_version),
801 le32_to_cpu(con->v1.in_reply.protocol_version));
802 con->error_msg = "protocol version mismatch";
803 return -1;
804
805 case CEPH_MSGR_TAG_BADAUTHORIZER:
806 con->v1.auth_retry++;
807 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
808 con->v1.auth_retry);
809 if (con->v1.auth_retry == 2) {
810 con->error_msg = "connect authorization failure";
811 return -1;
812 }
813 con_out_kvec_reset(con);
814 ret = prepare_write_connect(con);
815 if (ret < 0)
816 return ret;
817 prepare_read_connect(con);
818 break;
819
820 case CEPH_MSGR_TAG_RESETSESSION:
821 /*
822 * If we connected with a large connect_seq but the peer
823 * has no record of a session with us (no connection, or
824 * connect_seq == 0), they will send RESETSESION to indicate
825 * that they must have reset their session, and may have
826 * dropped messages.
827 */
828 dout("process_connect got RESET peer seq %u\n",
829 le32_to_cpu(con->v1.in_reply.connect_seq));
830 pr_info("%s%lld %s session reset\n",
831 ENTITY_NAME(con->peer_name),
832 ceph_pr_addr(&con->peer_addr));
833 ceph_con_reset_session(con);
834 con_out_kvec_reset(con);
835 ret = prepare_write_connect(con);
836 if (ret < 0)
837 return ret;
838 prepare_read_connect(con);
839
840 /* Tell ceph about it. */
841 mutex_unlock(&con->mutex);
842 if (con->ops->peer_reset)
843 con->ops->peer_reset(con);
844 mutex_lock(&con->mutex);
845 if (con->state != CEPH_CON_S_V1_CONNECT_MSG)
846 return -EAGAIN;
847 break;
848
849 case CEPH_MSGR_TAG_RETRY_SESSION:
850 /*
851 * If we sent a smaller connect_seq than the peer has, try
852 * again with a larger value.
853 */
854 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
855 le32_to_cpu(con->v1.out_connect.connect_seq),
856 le32_to_cpu(con->v1.in_reply.connect_seq));
857 con->v1.connect_seq = le32_to_cpu(con->v1.in_reply.connect_seq);
858 con_out_kvec_reset(con);
859 ret = prepare_write_connect(con);
860 if (ret < 0)
861 return ret;
862 prepare_read_connect(con);
863 break;
864
865 case CEPH_MSGR_TAG_RETRY_GLOBAL:
866 /*
867 * If we sent a smaller global_seq than the peer has, try
868 * again with a larger value.
869 */
870 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
871 con->v1.peer_global_seq,
872 le32_to_cpu(con->v1.in_reply.global_seq));
873 ceph_get_global_seq(con->msgr,
874 le32_to_cpu(con->v1.in_reply.global_seq));
875 con_out_kvec_reset(con);
876 ret = prepare_write_connect(con);
877 if (ret < 0)
878 return ret;
879 prepare_read_connect(con);
880 break;
881
882 case CEPH_MSGR_TAG_SEQ:
883 case CEPH_MSGR_TAG_READY:
884 if (req_feat & ~server_feat) {
885 pr_err("%s%lld %s protocol feature mismatch,"
886 " my required %llx > server's %llx, need %llx\n",
887 ENTITY_NAME(con->peer_name),
888 ceph_pr_addr(&con->peer_addr),
889 req_feat, server_feat, req_feat & ~server_feat);
890 con->error_msg = "missing required protocol features";
891 return -1;
892 }
893
894 WARN_ON(con->state != CEPH_CON_S_V1_CONNECT_MSG);
895 con->state = CEPH_CON_S_OPEN;
896 con->v1.auth_retry = 0; /* we authenticated; clear flag */
897 con->v1.peer_global_seq =
898 le32_to_cpu(con->v1.in_reply.global_seq);
899 con->v1.connect_seq++;
900 con->peer_features = server_feat;
901 dout("process_connect got READY gseq %d cseq %d (%d)\n",
902 con->v1.peer_global_seq,
903 le32_to_cpu(con->v1.in_reply.connect_seq),
904 con->v1.connect_seq);
905 WARN_ON(con->v1.connect_seq !=
906 le32_to_cpu(con->v1.in_reply.connect_seq));
907
908 if (con->v1.in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
909 ceph_con_flag_set(con, CEPH_CON_F_LOSSYTX);
910
911 con->delay = 0; /* reset backoff memory */
912
913 if (con->v1.in_reply.tag == CEPH_MSGR_TAG_SEQ) {
914 prepare_write_seq(con);
915 prepare_read_seq(con);
916 } else {
917 prepare_read_tag(con);
918 }
919 break;
920
921 case CEPH_MSGR_TAG_WAIT:
922 /*
923 * If there is a connection race (we are opening
924 * connections to each other), one of us may just have
925 * to WAIT. This shouldn't happen if we are the
926 * client.
927 */
928 con->error_msg = "protocol error, got WAIT as client";
929 return -1;
930
931 default:
932 con->error_msg = "protocol error, garbage tag during connect";
933 return -1;
934 }
935 return 0;
936}
937
938/*
939 * read (part of) an ack
940 */
941static int read_partial_ack(struct ceph_connection *con)
942{
943 int size = sizeof(con->v1.in_temp_ack);
944 int end = size;
945
946 return read_partial(con, end, size, &con->v1.in_temp_ack);
947}
948
949/*
950 * We can finally discard anything that's been acked.
951 */
952static void process_ack(struct ceph_connection *con)
953{
954 u64 ack = le64_to_cpu(con->v1.in_temp_ack);
955
956 if (con->v1.in_tag == CEPH_MSGR_TAG_ACK)
957 ceph_con_discard_sent(con, ack);
958 else
959 ceph_con_discard_requeued(con, ack);
960
961 prepare_read_tag(con);
962}
963
964static int read_partial_message_chunk(struct ceph_connection *con,
965 struct kvec *section,
966 unsigned int sec_len, u32 *crc)
967{
968 int ret, left;
969
970 BUG_ON(!section);
971
972 while (section->iov_len < sec_len) {
973 BUG_ON(section->iov_base == NULL);
974 left = sec_len - section->iov_len;
975 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
976 section->iov_len, left);
977 if (ret <= 0)
978 return ret;
979 section->iov_len += ret;
980 }
981 if (section->iov_len == sec_len)
982 *crc = crc32c(*crc, section->iov_base, section->iov_len);
983
984 return 1;
985}
986
987static inline int read_partial_message_section(struct ceph_connection *con,
988 struct kvec *section,
989 unsigned int sec_len, u32 *crc)
990{
991 *crc = 0;
992 return read_partial_message_chunk(con, section, sec_len, crc);
993}
994
995static int read_partial_sparse_msg_extent(struct ceph_connection *con, u32 *crc)
996{
997 struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
998 bool do_bounce = ceph_test_opt(from_msgr(con->msgr), RXBOUNCE);
999
1000 if (do_bounce && unlikely(!con->bounce_page)) {
1001 con->bounce_page = alloc_page(GFP_NOIO);
1002 if (!con->bounce_page) {
1003 pr_err("failed to allocate bounce page\n");
1004 return -ENOMEM;
1005 }
1006 }
1007
1008 while (cursor->sr_resid > 0) {
1009 struct page *page, *rpage;
1010 size_t off, len;
1011 int ret;
1012
1013 page = ceph_msg_data_next(cursor, &off, &len);
1014 rpage = do_bounce ? con->bounce_page : page;
1015
1016 /* clamp to what remains in extent */
1017 len = min_t(int, len, cursor->sr_resid);
1018 ret = ceph_tcp_recvpage(con->sock, rpage, (int)off, len);
1019 if (ret <= 0)
1020 return ret;
1021 *crc = ceph_crc32c_page(*crc, rpage, off, ret);
1022 ceph_msg_data_advance(cursor, (size_t)ret);
1023 cursor->sr_resid -= ret;
1024 if (do_bounce)
1025 memcpy_page(page, off, rpage, off, ret);
1026 }
1027 return 1;
1028}
1029
1030static int read_partial_sparse_msg_data(struct ceph_connection *con)
1031{
1032 struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
1033 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1034 u32 crc = 0;
1035 int ret = 1;
1036
1037 if (do_datacrc)
1038 crc = con->in_data_crc;
1039
1040 while (cursor->total_resid) {
1041 if (con->v1.in_sr_kvec.iov_base)
1042 ret = read_partial_message_chunk(con,
1043 &con->v1.in_sr_kvec,
1044 con->v1.in_sr_len,
1045 &crc);
1046 else if (cursor->sr_resid > 0)
1047 ret = read_partial_sparse_msg_extent(con, &crc);
1048 if (ret <= 0)
1049 break;
1050
1051 memset(&con->v1.in_sr_kvec, 0, sizeof(con->v1.in_sr_kvec));
1052 ret = con->ops->sparse_read(con, cursor,
1053 (char **)&con->v1.in_sr_kvec.iov_base);
1054 if (ret <= 0) {
1055 ret = ret ? ret : 1; /* must return > 0 to indicate success */
1056 break;
1057 }
1058 con->v1.in_sr_len = ret;
1059 }
1060
1061 if (do_datacrc)
1062 con->in_data_crc = crc;
1063
1064 return ret;
1065}
1066
1067static int read_partial_msg_data(struct ceph_connection *con)
1068{
1069 struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
1070 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1071 struct page *page;
1072 size_t page_offset;
1073 size_t length;
1074 u32 crc = 0;
1075 int ret;
1076
1077 if (do_datacrc)
1078 crc = con->in_data_crc;
1079 while (cursor->total_resid) {
1080 if (!cursor->resid) {
1081 ceph_msg_data_advance(cursor, 0);
1082 continue;
1083 }
1084
1085 page = ceph_msg_data_next(cursor, &page_offset, &length);
1086 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
1087 if (ret <= 0) {
1088 if (do_datacrc)
1089 con->in_data_crc = crc;
1090
1091 return ret;
1092 }
1093
1094 if (do_datacrc)
1095 crc = ceph_crc32c_page(crc, page, page_offset, ret);
1096 ceph_msg_data_advance(cursor, (size_t)ret);
1097 }
1098 if (do_datacrc)
1099 con->in_data_crc = crc;
1100
1101 return 1; /* must return > 0 to indicate success */
1102}
1103
1104static int read_partial_msg_data_bounce(struct ceph_connection *con)
1105{
1106 struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
1107 struct page *page;
1108 size_t off, len;
1109 u32 crc;
1110 int ret;
1111
1112 if (unlikely(!con->bounce_page)) {
1113 con->bounce_page = alloc_page(GFP_NOIO);
1114 if (!con->bounce_page) {
1115 pr_err("failed to allocate bounce page\n");
1116 return -ENOMEM;
1117 }
1118 }
1119
1120 crc = con->in_data_crc;
1121 while (cursor->total_resid) {
1122 if (!cursor->resid) {
1123 ceph_msg_data_advance(cursor, 0);
1124 continue;
1125 }
1126
1127 page = ceph_msg_data_next(cursor, &off, &len);
1128 ret = ceph_tcp_recvpage(con->sock, con->bounce_page, 0, len);
1129 if (ret <= 0) {
1130 con->in_data_crc = crc;
1131 return ret;
1132 }
1133
1134 crc = crc32c(crc, page_address(con->bounce_page), ret);
1135 memcpy_to_page(page, off, page_address(con->bounce_page), ret);
1136
1137 ceph_msg_data_advance(cursor, ret);
1138 }
1139 con->in_data_crc = crc;
1140
1141 return 1; /* must return > 0 to indicate success */
1142}
1143
1144/*
1145 * read (part of) a message.
1146 */
1147static int read_partial_message(struct ceph_connection *con)
1148{
1149 struct ceph_msg *m = con->in_msg;
1150 int size;
1151 int end;
1152 int ret;
1153 unsigned int front_len, middle_len, data_len;
1154 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1155 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
1156 u64 seq;
1157 u32 crc;
1158
1159 dout("read_partial_message con %p msg %p\n", con, m);
1160
1161 /* header */
1162 size = sizeof(con->v1.in_hdr);
1163 end = size;
1164 ret = read_partial(con, end, size, &con->v1.in_hdr);
1165 if (ret <= 0)
1166 return ret;
1167
1168 crc = crc32c(0, &con->v1.in_hdr, offsetof(struct ceph_msg_header, crc));
1169 if (cpu_to_le32(crc) != con->v1.in_hdr.crc) {
1170 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
1171 crc, con->v1.in_hdr.crc);
1172 return -EBADMSG;
1173 }
1174
1175 front_len = le32_to_cpu(con->v1.in_hdr.front_len);
1176 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1177 return -EIO;
1178 middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
1179 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
1180 return -EIO;
1181 data_len = le32_to_cpu(con->v1.in_hdr.data_len);
1182 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1183 return -EIO;
1184
1185 /* verify seq# */
1186 seq = le64_to_cpu(con->v1.in_hdr.seq);
1187 if ((s64)seq - (s64)con->in_seq < 1) {
1188 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1189 ENTITY_NAME(con->peer_name),
1190 ceph_pr_addr(&con->peer_addr),
1191 seq, con->in_seq + 1);
1192 con->v1.in_base_pos = -front_len - middle_len - data_len -
1193 sizeof_footer(con);
1194 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1195 return 1;
1196 } else if ((s64)seq - (s64)con->in_seq > 1) {
1197 pr_err("read_partial_message bad seq %lld expected %lld\n",
1198 seq, con->in_seq + 1);
1199 con->error_msg = "bad message sequence # for incoming message";
1200 return -EBADE;
1201 }
1202
1203 /* allocate message? */
1204 if (!con->in_msg) {
1205 int skip = 0;
1206
1207 dout("got hdr type %d front %d data %d\n", con->v1.in_hdr.type,
1208 front_len, data_len);
1209 ret = ceph_con_in_msg_alloc(con, &con->v1.in_hdr, &skip);
1210 if (ret < 0)
1211 return ret;
1212
1213 BUG_ON((!con->in_msg) ^ skip);
1214 if (skip) {
1215 /* skip this message */
1216 dout("alloc_msg said skip message\n");
1217 con->v1.in_base_pos = -front_len - middle_len -
1218 data_len - sizeof_footer(con);
1219 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1220 con->in_seq++;
1221 return 1;
1222 }
1223
1224 BUG_ON(!con->in_msg);
1225 BUG_ON(con->in_msg->con != con);
1226 m = con->in_msg;
1227 m->front.iov_len = 0; /* haven't read it yet */
1228 if (m->middle)
1229 m->middle->vec.iov_len = 0;
1230
1231 /* prepare for data payload, if any */
1232
1233 if (data_len)
1234 prepare_message_data(con->in_msg, data_len);
1235 }
1236
1237 /* front */
1238 ret = read_partial_message_section(con, &m->front, front_len,
1239 &con->in_front_crc);
1240 if (ret <= 0)
1241 return ret;
1242
1243 /* middle */
1244 if (m->middle) {
1245 ret = read_partial_message_section(con, &m->middle->vec,
1246 middle_len,
1247 &con->in_middle_crc);
1248 if (ret <= 0)
1249 return ret;
1250 }
1251
1252 /* (page) data */
1253 if (data_len) {
1254 if (!m->num_data_items)
1255 return -EIO;
1256
1257 if (m->sparse_read_total)
1258 ret = read_partial_sparse_msg_data(con);
1259 else if (ceph_test_opt(from_msgr(con->msgr), RXBOUNCE))
1260 ret = read_partial_msg_data_bounce(con);
1261 else
1262 ret = read_partial_msg_data(con);
1263 if (ret <= 0)
1264 return ret;
1265 }
1266
1267 /* footer */
1268 size = sizeof_footer(con);
1269 end += size;
1270 ret = read_partial(con, end, size, &m->footer);
1271 if (ret <= 0)
1272 return ret;
1273
1274 if (!need_sign) {
1275 m->footer.flags = m->old_footer.flags;
1276 m->footer.sig = 0;
1277 }
1278
1279 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1280 m, front_len, m->footer.front_crc, middle_len,
1281 m->footer.middle_crc, data_len, m->footer.data_crc);
1282
1283 /* crc ok? */
1284 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1285 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1286 m, con->in_front_crc, m->footer.front_crc);
1287 return -EBADMSG;
1288 }
1289 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1290 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1291 m, con->in_middle_crc, m->footer.middle_crc);
1292 return -EBADMSG;
1293 }
1294 if (do_datacrc &&
1295 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1296 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1297 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1298 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1299 return -EBADMSG;
1300 }
1301
1302 if (need_sign && con->ops->check_message_signature &&
1303 con->ops->check_message_signature(m)) {
1304 pr_err("read_partial_message %p signature check failed\n", m);
1305 return -EBADMSG;
1306 }
1307
1308 return 1; /* done! */
1309}
1310
1311static int read_keepalive_ack(struct ceph_connection *con)
1312{
1313 struct ceph_timespec ceph_ts;
1314 size_t size = sizeof(ceph_ts);
1315 int ret = read_partial(con, size, size, &ceph_ts);
1316 if (ret <= 0)
1317 return ret;
1318 ceph_decode_timespec64(&con->last_keepalive_ack, &ceph_ts);
1319 prepare_read_tag(con);
1320 return 1;
1321}
1322
1323/*
1324 * Read what we can from the socket.
1325 */
1326int ceph_con_v1_try_read(struct ceph_connection *con)
1327{
1328 int ret = -1;
1329
1330more:
1331 dout("try_read start %p state %d\n", con, con->state);
1332 if (con->state != CEPH_CON_S_V1_BANNER &&
1333 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
1334 con->state != CEPH_CON_S_OPEN)
1335 return 0;
1336
1337 BUG_ON(!con->sock);
1338
1339 dout("try_read tag %d in_base_pos %d\n", con->v1.in_tag,
1340 con->v1.in_base_pos);
1341
1342 if (con->state == CEPH_CON_S_V1_BANNER) {
1343 ret = read_partial_banner(con);
1344 if (ret <= 0)
1345 goto out;
1346 ret = process_banner(con);
1347 if (ret < 0)
1348 goto out;
1349
1350 con->state = CEPH_CON_S_V1_CONNECT_MSG;
1351
1352 /*
1353 * Received banner is good, exchange connection info.
1354 * Do not reset out_kvec, as sending our banner raced
1355 * with receiving peer banner after connect completed.
1356 */
1357 ret = prepare_write_connect(con);
1358 if (ret < 0)
1359 goto out;
1360 prepare_read_connect(con);
1361
1362 /* Send connection info before awaiting response */
1363 goto out;
1364 }
1365
1366 if (con->state == CEPH_CON_S_V1_CONNECT_MSG) {
1367 ret = read_partial_connect(con);
1368 if (ret <= 0)
1369 goto out;
1370 ret = process_connect(con);
1371 if (ret < 0)
1372 goto out;
1373 goto more;
1374 }
1375
1376 WARN_ON(con->state != CEPH_CON_S_OPEN);
1377
1378 if (con->v1.in_base_pos < 0) {
1379 /*
1380 * skipping + discarding content.
1381 */
1382 ret = ceph_tcp_recvmsg(con->sock, NULL, -con->v1.in_base_pos);
1383 if (ret <= 0)
1384 goto out;
1385 dout("skipped %d / %d bytes\n", ret, -con->v1.in_base_pos);
1386 con->v1.in_base_pos += ret;
1387 if (con->v1.in_base_pos)
1388 goto more;
1389 }
1390 if (con->v1.in_tag == CEPH_MSGR_TAG_READY) {
1391 /*
1392 * what's next?
1393 */
1394 ret = ceph_tcp_recvmsg(con->sock, &con->v1.in_tag, 1);
1395 if (ret <= 0)
1396 goto out;
1397 dout("try_read got tag %d\n", con->v1.in_tag);
1398 switch (con->v1.in_tag) {
1399 case CEPH_MSGR_TAG_MSG:
1400 prepare_read_message(con);
1401 break;
1402 case CEPH_MSGR_TAG_ACK:
1403 prepare_read_ack(con);
1404 break;
1405 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
1406 prepare_read_keepalive_ack(con);
1407 break;
1408 case CEPH_MSGR_TAG_CLOSE:
1409 ceph_con_close_socket(con);
1410 con->state = CEPH_CON_S_CLOSED;
1411 goto out;
1412 default:
1413 goto bad_tag;
1414 }
1415 }
1416 if (con->v1.in_tag == CEPH_MSGR_TAG_MSG) {
1417 ret = read_partial_message(con);
1418 if (ret <= 0) {
1419 switch (ret) {
1420 case -EBADMSG:
1421 con->error_msg = "bad crc/signature";
1422 fallthrough;
1423 case -EBADE:
1424 ret = -EIO;
1425 break;
1426 case -EIO:
1427 con->error_msg = "io error";
1428 break;
1429 }
1430 goto out;
1431 }
1432 if (con->v1.in_tag == CEPH_MSGR_TAG_READY)
1433 goto more;
1434 ceph_con_process_message(con);
1435 if (con->state == CEPH_CON_S_OPEN)
1436 prepare_read_tag(con);
1437 goto more;
1438 }
1439 if (con->v1.in_tag == CEPH_MSGR_TAG_ACK ||
1440 con->v1.in_tag == CEPH_MSGR_TAG_SEQ) {
1441 /*
1442 * the final handshake seq exchange is semantically
1443 * equivalent to an ACK
1444 */
1445 ret = read_partial_ack(con);
1446 if (ret <= 0)
1447 goto out;
1448 process_ack(con);
1449 goto more;
1450 }
1451 if (con->v1.in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
1452 ret = read_keepalive_ack(con);
1453 if (ret <= 0)
1454 goto out;
1455 goto more;
1456 }
1457
1458out:
1459 dout("try_read done on %p ret %d\n", con, ret);
1460 return ret;
1461
1462bad_tag:
1463 pr_err("try_read bad tag %d\n", con->v1.in_tag);
1464 con->error_msg = "protocol error, garbage tag";
1465 ret = -1;
1466 goto out;
1467}
1468
1469/*
1470 * Write something to the socket. Called in a worker thread when the
1471 * socket appears to be writeable and we have something ready to send.
1472 */
1473int ceph_con_v1_try_write(struct ceph_connection *con)
1474{
1475 int ret = 1;
1476
1477 dout("try_write start %p state %d\n", con, con->state);
1478 if (con->state != CEPH_CON_S_PREOPEN &&
1479 con->state != CEPH_CON_S_V1_BANNER &&
1480 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
1481 con->state != CEPH_CON_S_OPEN)
1482 return 0;
1483
1484 /* open the socket first? */
1485 if (con->state == CEPH_CON_S_PREOPEN) {
1486 BUG_ON(con->sock);
1487 con->state = CEPH_CON_S_V1_BANNER;
1488
1489 con_out_kvec_reset(con);
1490 prepare_write_banner(con);
1491 prepare_read_banner(con);
1492
1493 BUG_ON(con->in_msg);
1494 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1495 dout("try_write initiating connect on %p new state %d\n",
1496 con, con->state);
1497 ret = ceph_tcp_connect(con);
1498 if (ret < 0) {
1499 con->error_msg = "connect error";
1500 goto out;
1501 }
1502 }
1503
1504more:
1505 dout("try_write out_kvec_bytes %d\n", con->v1.out_kvec_bytes);
1506 BUG_ON(!con->sock);
1507
1508 /* kvec data queued? */
1509 if (con->v1.out_kvec_left) {
1510 ret = write_partial_kvec(con);
1511 if (ret <= 0)
1512 goto out;
1513 }
1514 if (con->v1.out_skip) {
1515 ret = write_partial_skip(con);
1516 if (ret <= 0)
1517 goto out;
1518 }
1519
1520 /* msg pages? */
1521 if (con->out_msg) {
1522 if (con->v1.out_msg_done) {
1523 ceph_msg_put(con->out_msg);
1524 con->out_msg = NULL; /* we're done with this one */
1525 goto do_next;
1526 }
1527
1528 ret = write_partial_message_data(con);
1529 if (ret == 1)
1530 goto more; /* we need to send the footer, too! */
1531 if (ret == 0)
1532 goto out;
1533 if (ret < 0) {
1534 dout("try_write write_partial_message_data err %d\n",
1535 ret);
1536 goto out;
1537 }
1538 }
1539
1540do_next:
1541 if (con->state == CEPH_CON_S_OPEN) {
1542 if (ceph_con_flag_test_and_clear(con,
1543 CEPH_CON_F_KEEPALIVE_PENDING)) {
1544 prepare_write_keepalive(con);
1545 goto more;
1546 }
1547 /* is anything else pending? */
1548 if (!list_empty(&con->out_queue)) {
1549 prepare_write_message(con);
1550 goto more;
1551 }
1552 if (con->in_seq > con->in_seq_acked) {
1553 prepare_write_ack(con);
1554 goto more;
1555 }
1556 }
1557
1558 /* Nothing to do! */
1559 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING);
1560 dout("try_write nothing else to write.\n");
1561 ret = 0;
1562out:
1563 dout("try_write done on %p ret %d\n", con, ret);
1564 return ret;
1565}
1566
1567void ceph_con_v1_revoke(struct ceph_connection *con)
1568{
1569 struct ceph_msg *msg = con->out_msg;
1570
1571 WARN_ON(con->v1.out_skip);
1572 /* footer */
1573 if (con->v1.out_msg_done) {
1574 con->v1.out_skip += con_out_kvec_skip(con);
1575 } else {
1576 WARN_ON(!msg->data_length);
1577 con->v1.out_skip += sizeof_footer(con);
1578 }
1579 /* data, middle, front */
1580 if (msg->data_length)
1581 con->v1.out_skip += msg->cursor.total_resid;
1582 if (msg->middle)
1583 con->v1.out_skip += con_out_kvec_skip(con);
1584 con->v1.out_skip += con_out_kvec_skip(con);
1585
1586 dout("%s con %p out_kvec_bytes %d out_skip %d\n", __func__, con,
1587 con->v1.out_kvec_bytes, con->v1.out_skip);
1588}
1589
1590void ceph_con_v1_revoke_incoming(struct ceph_connection *con)
1591{
1592 unsigned int front_len = le32_to_cpu(con->v1.in_hdr.front_len);
1593 unsigned int middle_len = le32_to_cpu(con->v1.in_hdr.middle_len);
1594 unsigned int data_len = le32_to_cpu(con->v1.in_hdr.data_len);
1595
1596 /* skip rest of message */
1597 con->v1.in_base_pos = con->v1.in_base_pos -
1598 sizeof(struct ceph_msg_header) -
1599 front_len -
1600 middle_len -
1601 data_len -
1602 sizeof(struct ceph_msg_footer);
1603
1604 con->v1.in_tag = CEPH_MSGR_TAG_READY;
1605 con->in_seq++;
1606
1607 dout("%s con %p in_base_pos %d\n", __func__, con, con->v1.in_base_pos);
1608}
1609
1610bool ceph_con_v1_opened(struct ceph_connection *con)
1611{
1612 return con->v1.connect_seq;
1613}
1614
1615void ceph_con_v1_reset_session(struct ceph_connection *con)
1616{
1617 con->v1.connect_seq = 0;
1618 con->v1.peer_global_seq = 0;
1619}
1620
1621void ceph_con_v1_reset_protocol(struct ceph_connection *con)
1622{
1623 con->v1.out_skip = 0;
1624}