messenger.c (566050e17e53db283d4e26b73b4b50556f97ce7b) messenger.c (2f713615ddd9d805b6c5e79c52e0e11af99d2bf1)
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/crc32c.h>
5#include <linux/ctype.h>
6#include <linux/highmem.h>
7#include <linux/inet.h>
8#include <linux/kthread.h>

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132
133 return test_and_set_bit(con_flag, &con->flags);
134}
135
136/* Slab caches for frequently-allocated structures */
137
138static struct kmem_cache *ceph_msg_cache;
139
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/crc32c.h>
5#include <linux/ctype.h>
6#include <linux/highmem.h>
7#include <linux/inet.h>
8#include <linux/kthread.h>

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132
133 return test_and_set_bit(con_flag, &con->flags);
134}
135
136/* Slab caches for frequently-allocated structures */
137
138static struct kmem_cache *ceph_msg_cache;
139
140/* static tag bytes (protocol control messages) */
141static char tag_msg = CEPH_MSGR_TAG_MSG;
142static char tag_ack = CEPH_MSGR_TAG_ACK;
143static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
144static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
145
146#ifdef CONFIG_LOCKDEP
147static struct lock_class_key socket_class;
148#endif
149
150static void queue_con(struct ceph_connection *con);
151static void cancel_con(struct ceph_connection *con);
152static void ceph_con_workfn(struct work_struct *);
153static void con_fault(struct ceph_connection *con);

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473 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY))
474 tcp_sock_set_nodelay(sock->sk);
475
476 con->sock = sock;
477 return 0;
478}
479
480/*
140#ifdef CONFIG_LOCKDEP
141static struct lock_class_key socket_class;
142#endif
143
144static void queue_con(struct ceph_connection *con);
145static void cancel_con(struct ceph_connection *con);
146static void ceph_con_workfn(struct work_struct *);
147static void con_fault(struct ceph_connection *con);

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467 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY))
468 tcp_sock_set_nodelay(sock->sk);
469
470 con->sock = sock;
471 return 0;
472}
473
474/*
481 * If @buf is NULL, discard up to @len bytes.
482 */
483static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
484{
485 struct kvec iov = {buf, len};
486 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
487 int r;
488
489 if (!buf)
490 msg.msg_flags |= MSG_TRUNC;
491
492 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, len);
493 r = sock_recvmsg(sock, &msg, msg.msg_flags);
494 if (r == -EAGAIN)
495 r = 0;
496 return r;
497}
498
499static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
500 int page_offset, size_t length)
501{
502 struct bio_vec bvec = {
503 .bv_page = page,
504 .bv_offset = page_offset,
505 .bv_len = length
506 };
507 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
508 int r;
509
510 BUG_ON(page_offset + length > PAGE_SIZE);
511 iov_iter_bvec(&msg.msg_iter, READ, &bvec, 1, length);
512 r = sock_recvmsg(sock, &msg, msg.msg_flags);
513 if (r == -EAGAIN)
514 r = 0;
515 return r;
516}
517
518/*
519 * write something. @more is true if caller will be sending more data
520 * shortly.
521 */
522static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
523 size_t kvlen, size_t len, bool more)
524{
525 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
526 int r;
527
528 if (more)
529 msg.msg_flags |= MSG_MORE;
530 else
531 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
532
533 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
534 if (r == -EAGAIN)
535 r = 0;
536 return r;
537}
538
539/*
540 * @more: either or both of MSG_MORE and MSG_SENDPAGE_NOTLAST
541 */
542static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
543 int offset, size_t size, int more)
544{
545 ssize_t (*sendpage)(struct socket *sock, struct page *page,
546 int offset, size_t size, int flags);
547 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | more;
548 int ret;
549
550 /*
551 * sendpage cannot properly handle pages with page_count == 0,
552 * we need to fall back to sendmsg if that's the case.
553 *
554 * Same goes for slab pages: skb_can_coalesce() allows
555 * coalescing neighboring slab objects into a single frag which
556 * triggers one of hardened usercopy checks.
557 */
558 if (sendpage_ok(page))
559 sendpage = sock->ops->sendpage;
560 else
561 sendpage = sock_no_sendpage;
562
563 ret = sendpage(sock, page, offset, size, flags);
564 if (ret == -EAGAIN)
565 ret = 0;
566
567 return ret;
568}
569
570/*
571 * Shutdown/close the socket for the given connection.
572 */
573int ceph_con_close_socket(struct ceph_connection *con)
574{
575 int rc = 0;
576
577 dout("%s con %p sock %p\n", __func__, con, con->sock);
578 if (con->sock) {

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588 * shut the socket down.
589 */
590 ceph_con_flag_clear(con, CEPH_CON_F_SOCK_CLOSED);
591
592 con_sock_state_closed(con);
593 return rc;
594}
595
475 * Shutdown/close the socket for the given connection.
476 */
477int ceph_con_close_socket(struct ceph_connection *con)
478{
479 int rc = 0;
480
481 dout("%s con %p sock %p\n", __func__, con, con->sock);
482 if (con->sock) {

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492 * shut the socket down.
493 */
494 ceph_con_flag_clear(con, CEPH_CON_F_SOCK_CLOSED);
495
496 con_sock_state_closed(con);
497 return rc;
498}
499
596void ceph_con_v1_reset_protocol(struct ceph_connection *con)
597{
598 con->out_skip = 0;
599}
600
601static void ceph_con_reset_protocol(struct ceph_connection *con)
602{
603 dout("%s con %p\n", __func__, con);
604
605 ceph_con_close_socket(con);
606 if (con->in_msg) {
607 WARN_ON(con->in_msg->con != con);
608 ceph_msg_put(con->in_msg);

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631{
632 while (!list_empty(head)) {
633 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
634 list_head);
635 ceph_msg_remove(msg);
636 }
637}
638
500static void ceph_con_reset_protocol(struct ceph_connection *con)
501{
502 dout("%s con %p\n", __func__, con);
503
504 ceph_con_close_socket(con);
505 if (con->in_msg) {
506 WARN_ON(con->in_msg->con != con);
507 ceph_msg_put(con->in_msg);

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530{
531 while (!list_empty(head)) {
532 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
533 list_head);
534 ceph_msg_remove(msg);
535 }
536}
537
639void ceph_con_v1_reset_session(struct ceph_connection *con)
640{
641 con->connect_seq = 0;
642 con->peer_global_seq = 0;
643}
644
645void ceph_con_reset_session(struct ceph_connection *con)
646{
647 dout("%s con %p\n", __func__, con);
648
649 WARN_ON(con->in_msg);
650 WARN_ON(con->out_msg);
651 ceph_msg_remove_list(&con->out_queue);
652 ceph_msg_remove_list(&con->out_sent);

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697
698 memcpy(&con->peer_addr, addr, sizeof(*addr));
699 con->delay = 0; /* reset backoff memory */
700 mutex_unlock(&con->mutex);
701 queue_con(con);
702}
703EXPORT_SYMBOL(ceph_con_open);
704
538void ceph_con_reset_session(struct ceph_connection *con)
539{
540 dout("%s con %p\n", __func__, con);
541
542 WARN_ON(con->in_msg);
543 WARN_ON(con->out_msg);
544 ceph_msg_remove_list(&con->out_queue);
545 ceph_msg_remove_list(&con->out_sent);

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590
591 memcpy(&con->peer_addr, addr, sizeof(*addr));
592 con->delay = 0; /* reset backoff memory */
593 mutex_unlock(&con->mutex);
594 queue_con(con);
595}
596EXPORT_SYMBOL(ceph_con_open);
597
705bool ceph_con_v1_opened(struct ceph_connection *con)
706{
707 return con->connect_seq;
708}
709
710/*
711 * return true if this connection ever successfully opened
712 */
713bool ceph_con_opened(struct ceph_connection *con)
714{
715 return ceph_con_v1_opened(con);
716}
717

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734 INIT_LIST_HEAD(&con->out_queue);
735 INIT_LIST_HEAD(&con->out_sent);
736 INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
737
738 con->state = CEPH_CON_S_CLOSED;
739}
740EXPORT_SYMBOL(ceph_con_init);
741
598/*
599 * return true if this connection ever successfully opened
600 */
601bool ceph_con_opened(struct ceph_connection *con)
602{
603 return ceph_con_v1_opened(con);
604}
605

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622 INIT_LIST_HEAD(&con->out_queue);
623 INIT_LIST_HEAD(&con->out_sent);
624 INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
625
626 con->state = CEPH_CON_S_CLOSED;
627}
628EXPORT_SYMBOL(ceph_con_init);
629
742
743/*
744 * We maintain a global counter to order connection attempts. Get
745 * a unique seq greater than @gt.
746 */
747u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt)
748{
749 u32 ret;
750

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800 break;
801
802 dout("%s con %p discarding msg %p seq %llu\n", __func__, con,
803 msg, seq);
804 ceph_msg_remove(msg);
805 }
806}
807
630/*
631 * We maintain a global counter to order connection attempts. Get
632 * a unique seq greater than @gt.
633 */
634u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt)
635{
636 u32 ret;
637

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687 break;
688
689 dout("%s con %p discarding msg %p seq %llu\n", __func__, con,
690 msg, seq);
691 ceph_msg_remove(msg);
692 }
693}
694
808static void con_out_kvec_reset(struct ceph_connection *con)
809{
810 BUG_ON(con->out_skip);
811
812 con->out_kvec_left = 0;
813 con->out_kvec_bytes = 0;
814 con->out_kvec_cur = &con->out_kvec[0];
815}
816
817static void con_out_kvec_add(struct ceph_connection *con,
818 size_t size, void *data)
819{
820 int index = con->out_kvec_left;
821
822 BUG_ON(con->out_skip);
823 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
824
825 con->out_kvec[index].iov_len = size;
826 con->out_kvec[index].iov_base = data;
827 con->out_kvec_left++;
828 con->out_kvec_bytes += size;
829}
830
831/*
832 * Chop off a kvec from the end. Return residual number of bytes for
833 * that kvec, i.e. how many bytes would have been written if the kvec
834 * hadn't been nuked.
835 */
836static int con_out_kvec_skip(struct ceph_connection *con)
837{
838 int off = con->out_kvec_cur - con->out_kvec;
839 int skip = 0;
840
841 if (con->out_kvec_bytes > 0) {
842 skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len;
843 BUG_ON(con->out_kvec_bytes < skip);
844 BUG_ON(!con->out_kvec_left);
845 con->out_kvec_bytes -= skip;
846 con->out_kvec_left--;
847 }
848
849 return skip;
850}
851
852#ifdef CONFIG_BLOCK
853
854/*
855 * For a bio data item, a piece is whatever remains of the next
856 * entry in the current bio iovec, or the first entry in the next
857 * bio in the list.
858 */
859static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,

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1255 WARN_ON(!cursor->last_piece);
1256 cursor->data++;
1257 __ceph_msg_data_cursor_init(cursor);
1258 new_piece = true;
1259 }
1260 cursor->need_crc = new_piece;
1261}
1262
695#ifdef CONFIG_BLOCK
696
697/*
698 * For a bio data item, a piece is whatever remains of the next
699 * entry in the current bio iovec, or the first entry in the next
700 * bio in the list.
701 */
702static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,

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1098 WARN_ON(!cursor->last_piece);
1099 cursor->data++;
1100 __ceph_msg_data_cursor_init(cursor);
1101 new_piece = true;
1102 }
1103 cursor->need_crc = new_piece;
1104}
1105
1263static size_t sizeof_footer(struct ceph_connection *con)
1264{
1265 return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
1266 sizeof(struct ceph_msg_footer) :
1267 sizeof(struct ceph_msg_footer_old);
1268}
1269
1270static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
1271{
1272 /* Initialize data cursor */
1273
1274 ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
1275}
1276
1277/*
1278 * Prepare footer for currently outgoing message, and finish things
1279 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1280 */
1281static void prepare_write_message_footer(struct ceph_connection *con)
1282{
1283 struct ceph_msg *m = con->out_msg;
1284
1285 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
1286
1287 dout("prepare_write_message_footer %p\n", con);
1288 con_out_kvec_add(con, sizeof_footer(con), &m->footer);
1289 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
1290 if (con->ops->sign_message)
1291 con->ops->sign_message(m);
1292 else
1293 m->footer.sig = 0;
1294 } else {
1295 m->old_footer.flags = m->footer.flags;
1296 }
1297 con->out_more = m->more_to_follow;
1298 con->out_msg_done = true;
1299}
1300
1301/*
1302 * Prepare headers for the next outgoing message.
1303 */
1304static void prepare_write_message(struct ceph_connection *con)
1305{
1306 struct ceph_msg *m;
1307 u32 crc;
1308
1309 con_out_kvec_reset(con);
1310 con->out_msg_done = false;
1311
1312 /* Sneak an ack in there first? If we can get it into the same
1313 * TCP packet that's a good thing. */
1314 if (con->in_seq > con->in_seq_acked) {
1315 con->in_seq_acked = con->in_seq;
1316 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1317 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1318 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1319 &con->out_temp_ack);
1320 }
1321
1322 ceph_con_get_out_msg(con);
1323 m = con->out_msg;
1324
1325 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1326 m, con->out_seq, le16_to_cpu(m->hdr.type),
1327 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
1328 m->data_length);
1329 WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));
1330 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
1331
1332 /* tag + hdr + front + middle */
1333 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
1334 con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr);
1335 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
1336
1337 if (m->middle)
1338 con_out_kvec_add(con, m->middle->vec.iov_len,
1339 m->middle->vec.iov_base);
1340
1341 /* fill in hdr crc and finalize hdr */
1342 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
1343 con->out_msg->hdr.crc = cpu_to_le32(crc);
1344 memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr));
1345
1346 /* fill in front and middle crc, footer */
1347 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
1348 con->out_msg->footer.front_crc = cpu_to_le32(crc);
1349 if (m->middle) {
1350 crc = crc32c(0, m->middle->vec.iov_base,
1351 m->middle->vec.iov_len);
1352 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
1353 } else
1354 con->out_msg->footer.middle_crc = 0;
1355 dout("%s front_crc %u middle_crc %u\n", __func__,
1356 le32_to_cpu(con->out_msg->footer.front_crc),
1357 le32_to_cpu(con->out_msg->footer.middle_crc));
1358 con->out_msg->footer.flags = 0;
1359
1360 /* is there a data payload? */
1361 con->out_msg->footer.data_crc = 0;
1362 if (m->data_length) {
1363 prepare_message_data(con->out_msg, m->data_length);
1364 con->out_more = 1; /* data + footer will follow */
1365 } else {
1366 /* no, queue up footer too and be done */
1367 prepare_write_message_footer(con);
1368 }
1369
1370 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1371}
1372
1373/*
1374 * Prepare an ack.
1375 */
1376static void prepare_write_ack(struct ceph_connection *con)
1377{
1378 dout("prepare_write_ack %p %llu -> %llu\n", con,
1379 con->in_seq_acked, con->in_seq);
1380 con->in_seq_acked = con->in_seq;
1381
1382 con_out_kvec_reset(con);
1383
1384 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1385
1386 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1387 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1388 &con->out_temp_ack);
1389
1390 con->out_more = 1; /* more will follow.. eventually.. */
1391 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1392}
1393
1394/*
1395 * Prepare to share the seq during handshake
1396 */
1397static void prepare_write_seq(struct ceph_connection *con)
1398{
1399 dout("prepare_write_seq %p %llu -> %llu\n", con,
1400 con->in_seq_acked, con->in_seq);
1401 con->in_seq_acked = con->in_seq;
1402
1403 con_out_kvec_reset(con);
1404
1405 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1406 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1407 &con->out_temp_ack);
1408
1409 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1410}
1411
1412/*
1413 * Prepare to write keepalive byte.
1414 */
1415static void prepare_write_keepalive(struct ceph_connection *con)
1416{
1417 dout("prepare_write_keepalive %p\n", con);
1418 con_out_kvec_reset(con);
1419 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
1420 struct timespec64 now;
1421
1422 ktime_get_real_ts64(&now);
1423 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
1424 ceph_encode_timespec64(&con->out_temp_keepalive2, &now);
1425 con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
1426 &con->out_temp_keepalive2);
1427 } else {
1428 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
1429 }
1430 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1431}
1432
1433/*
1434 * Connection negotiation.
1435 */
1436
1437static int get_connect_authorizer(struct ceph_connection *con)
1438{
1439 struct ceph_auth_handshake *auth;
1440 int auth_proto;
1441
1442 if (!con->ops->get_authorizer) {
1443 con->auth = NULL;
1444 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
1445 con->out_connect.authorizer_len = 0;
1446 return 0;
1447 }
1448
1449 auth = con->ops->get_authorizer(con, &auth_proto, con->auth_retry);
1450 if (IS_ERR(auth))
1451 return PTR_ERR(auth);
1452
1453 con->auth = auth;
1454 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
1455 con->out_connect.authorizer_len = cpu_to_le32(auth->authorizer_buf_len);
1456 return 0;
1457}
1458
1459/*
1460 * We connected to a peer and are saying hello.
1461 */
1462static void prepare_write_banner(struct ceph_connection *con)
1463{
1464 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
1465 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
1466 &con->msgr->my_enc_addr);
1467
1468 con->out_more = 0;
1469 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1470}
1471
1472static void __prepare_write_connect(struct ceph_connection *con)
1473{
1474 con_out_kvec_add(con, sizeof(con->out_connect), &con->out_connect);
1475 if (con->auth)
1476 con_out_kvec_add(con, con->auth->authorizer_buf_len,
1477 con->auth->authorizer_buf);
1478
1479 con->out_more = 0;
1480 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1481}
1482
1483static int prepare_write_connect(struct ceph_connection *con)
1484{
1485 unsigned int global_seq = ceph_get_global_seq(con->msgr, 0);
1486 int proto;
1487 int ret;
1488
1489 switch (con->peer_name.type) {
1490 case CEPH_ENTITY_TYPE_MON:
1491 proto = CEPH_MONC_PROTOCOL;
1492 break;
1493 case CEPH_ENTITY_TYPE_OSD:
1494 proto = CEPH_OSDC_PROTOCOL;
1495 break;
1496 case CEPH_ENTITY_TYPE_MDS:
1497 proto = CEPH_MDSC_PROTOCOL;
1498 break;
1499 default:
1500 BUG();
1501 }
1502
1503 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
1504 con->connect_seq, global_seq, proto);
1505
1506 con->out_connect.features =
1507 cpu_to_le64(from_msgr(con->msgr)->supported_features);
1508 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
1509 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
1510 con->out_connect.global_seq = cpu_to_le32(global_seq);
1511 con->out_connect.protocol_version = cpu_to_le32(proto);
1512 con->out_connect.flags = 0;
1513
1514 ret = get_connect_authorizer(con);
1515 if (ret)
1516 return ret;
1517
1518 __prepare_write_connect(con);
1519 return 0;
1520}
1521
1522/*
1523 * write as much of pending kvecs to the socket as we can.
1524 * 1 -> done
1525 * 0 -> socket full, but more to do
1526 * <0 -> error
1527 */
1528static int write_partial_kvec(struct ceph_connection *con)
1529{
1530 int ret;
1531
1532 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
1533 while (con->out_kvec_bytes > 0) {
1534 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
1535 con->out_kvec_left, con->out_kvec_bytes,
1536 con->out_more);
1537 if (ret <= 0)
1538 goto out;
1539 con->out_kvec_bytes -= ret;
1540 if (con->out_kvec_bytes == 0)
1541 break; /* done */
1542
1543 /* account for full iov entries consumed */
1544 while (ret >= con->out_kvec_cur->iov_len) {
1545 BUG_ON(!con->out_kvec_left);
1546 ret -= con->out_kvec_cur->iov_len;
1547 con->out_kvec_cur++;
1548 con->out_kvec_left--;
1549 }
1550 /* and for a partially-consumed entry */
1551 if (ret) {
1552 con->out_kvec_cur->iov_len -= ret;
1553 con->out_kvec_cur->iov_base += ret;
1554 }
1555 }
1556 con->out_kvec_left = 0;
1557 ret = 1;
1558out:
1559 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
1560 con->out_kvec_bytes, con->out_kvec_left, ret);
1561 return ret; /* done! */
1562}
1563
1564u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset,
1565 unsigned int length)
1566{
1567 char *kaddr;
1568
1569 kaddr = kmap(page);
1570 BUG_ON(kaddr == NULL);
1571 crc = crc32c(crc, kaddr + page_offset, length);
1572 kunmap(page);
1573
1574 return crc;
1575}
1106u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset,
1107 unsigned int length)
1108{
1109 char *kaddr;
1110
1111 kaddr = kmap(page);
1112 BUG_ON(kaddr == NULL);
1113 crc = crc32c(crc, kaddr + page_offset, length);
1114 kunmap(page);
1115
1116 return crc;
1117}
1576/*
1577 * Write as much message data payload as we can. If we finish, queue
1578 * up the footer.
1579 * 1 -> done, footer is now queued in out_kvec[].
1580 * 0 -> socket full, but more to do
1581 * <0 -> error
1582 */
1583static int write_partial_message_data(struct ceph_connection *con)
1584{
1585 struct ceph_msg *msg = con->out_msg;
1586 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1587 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1588 int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
1589 u32 crc;
1590
1118
1591 dout("%s %p msg %p\n", __func__, con, msg);
1592
1593 if (!msg->num_data_items)
1594 return -EINVAL;
1595
1596 /*
1597 * Iterate through each page that contains data to be
1598 * written, and send as much as possible for each.
1599 *
1600 * If we are calculating the data crc (the default), we will
1601 * need to map the page. If we have no pages, they have
1602 * been revoked, so use the zero page.
1603 */
1604 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
1605 while (cursor->total_resid) {
1606 struct page *page;
1607 size_t page_offset;
1608 size_t length;
1609 int ret;
1610
1611 if (!cursor->resid) {
1612 ceph_msg_data_advance(cursor, 0);
1613 continue;
1614 }
1615
1616 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
1617 if (length == cursor->total_resid)
1618 more = MSG_MORE;
1619 ret = ceph_tcp_sendpage(con->sock, page, page_offset, length,
1620 more);
1621 if (ret <= 0) {
1622 if (do_datacrc)
1623 msg->footer.data_crc = cpu_to_le32(crc);
1624
1625 return ret;
1626 }
1627 if (do_datacrc && cursor->need_crc)
1628 crc = ceph_crc32c_page(crc, page, page_offset, length);
1629 ceph_msg_data_advance(cursor, (size_t)ret);
1630 }
1631
1632 dout("%s %p msg %p done\n", __func__, con, msg);
1633
1634 /* prepare and queue up footer, too */
1635 if (do_datacrc)
1636 msg->footer.data_crc = cpu_to_le32(crc);
1637 else
1638 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1639 con_out_kvec_reset(con);
1640 prepare_write_message_footer(con);
1641
1642 return 1; /* must return > 0 to indicate success */
1643}
1644
1645/*
1646 * write some zeros
1647 */
1648static int write_partial_skip(struct ceph_connection *con)
1649{
1650 int more = MSG_MORE | MSG_SENDPAGE_NOTLAST;
1651 int ret;
1652
1653 dout("%s %p %d left\n", __func__, con, con->out_skip);
1654 while (con->out_skip > 0) {
1655 size_t size = min(con->out_skip, (int) PAGE_SIZE);
1656
1657 if (size == con->out_skip)
1658 more = MSG_MORE;
1659 ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size,
1660 more);
1661 if (ret <= 0)
1662 goto out;
1663 con->out_skip -= ret;
1664 }
1665 ret = 1;
1666out:
1667 return ret;
1668}
1669
1670/*
1671 * Prepare to read connection handshake, or an ack.
1672 */
1673static void prepare_read_banner(struct ceph_connection *con)
1674{
1675 dout("prepare_read_banner %p\n", con);
1676 con->in_base_pos = 0;
1677}
1678
1679static void prepare_read_connect(struct ceph_connection *con)
1680{
1681 dout("prepare_read_connect %p\n", con);
1682 con->in_base_pos = 0;
1683}
1684
1685static void prepare_read_ack(struct ceph_connection *con)
1686{
1687 dout("prepare_read_ack %p\n", con);
1688 con->in_base_pos = 0;
1689}
1690
1691static void prepare_read_seq(struct ceph_connection *con)
1692{
1693 dout("prepare_read_seq %p\n", con);
1694 con->in_base_pos = 0;
1695 con->in_tag = CEPH_MSGR_TAG_SEQ;
1696}
1697
1698static void prepare_read_tag(struct ceph_connection *con)
1699{
1700 dout("prepare_read_tag %p\n", con);
1701 con->in_base_pos = 0;
1702 con->in_tag = CEPH_MSGR_TAG_READY;
1703}
1704
1705static void prepare_read_keepalive_ack(struct ceph_connection *con)
1706{
1707 dout("prepare_read_keepalive_ack %p\n", con);
1708 con->in_base_pos = 0;
1709}
1710
1711/*
1712 * Prepare to read a message.
1713 */
1714static int prepare_read_message(struct ceph_connection *con)
1715{
1716 dout("prepare_read_message %p\n", con);
1717 BUG_ON(con->in_msg != NULL);
1718 con->in_base_pos = 0;
1719 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1720 return 0;
1721}
1722
1723
1724static int read_partial(struct ceph_connection *con,
1725 int end, int size, void *object)
1726{
1727 while (con->in_base_pos < end) {
1728 int left = end - con->in_base_pos;
1729 int have = size - left;
1730 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1731 if (ret <= 0)
1732 return ret;
1733 con->in_base_pos += ret;
1734 }
1735 return 1;
1736}
1737
1738
1739/*
1740 * Read all or part of the connect-side handshake on a new connection
1741 */
1742static int read_partial_banner(struct ceph_connection *con)
1743{
1744 int size;
1745 int end;
1746 int ret;
1747
1748 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1749
1750 /* peer's banner */
1751 size = strlen(CEPH_BANNER);
1752 end = size;
1753 ret = read_partial(con, end, size, con->in_banner);
1754 if (ret <= 0)
1755 goto out;
1756
1757 size = sizeof (con->actual_peer_addr);
1758 end += size;
1759 ret = read_partial(con, end, size, &con->actual_peer_addr);
1760 if (ret <= 0)
1761 goto out;
1762 ceph_decode_banner_addr(&con->actual_peer_addr);
1763
1764 size = sizeof (con->peer_addr_for_me);
1765 end += size;
1766 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1767 if (ret <= 0)
1768 goto out;
1769 ceph_decode_banner_addr(&con->peer_addr_for_me);
1770
1771out:
1772 return ret;
1773}
1774
1775static int read_partial_connect(struct ceph_connection *con)
1776{
1777 int size;
1778 int end;
1779 int ret;
1780
1781 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1782
1783 size = sizeof (con->in_reply);
1784 end = size;
1785 ret = read_partial(con, end, size, &con->in_reply);
1786 if (ret <= 0)
1787 goto out;
1788
1789 if (con->auth) {
1790 size = le32_to_cpu(con->in_reply.authorizer_len);
1791 if (size > con->auth->authorizer_reply_buf_len) {
1792 pr_err("authorizer reply too big: %d > %zu\n", size,
1793 con->auth->authorizer_reply_buf_len);
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 end += size;
1799 ret = read_partial(con, end, size,
1800 con->auth->authorizer_reply_buf);
1801 if (ret <= 0)
1802 goto out;
1803 }
1804
1805 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1806 con, (int)con->in_reply.tag,
1807 le32_to_cpu(con->in_reply.connect_seq),
1808 le32_to_cpu(con->in_reply.global_seq));
1809out:
1810 return ret;
1811}
1812
1813/*
1814 * Verify the hello banner looks okay.
1815 */
1816static int verify_hello(struct ceph_connection *con)
1817{
1818 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1819 pr_err("connect to %s got bad banner\n",
1820 ceph_pr_addr(&con->peer_addr));
1821 con->error_msg = "protocol error, bad banner";
1822 return -1;
1823 }
1824 return 0;
1825}
1826
1827bool ceph_addr_is_blank(const struct ceph_entity_addr *addr)
1828{
1829 struct sockaddr_storage ss = addr->in_addr; /* align */
1830 struct in_addr *addr4 = &((struct sockaddr_in *)&ss)->sin_addr;
1831 struct in6_addr *addr6 = &((struct sockaddr_in6 *)&ss)->sin6_addr;
1832
1833 switch (ss.ss_family) {
1834 case AF_INET:

--- 192 unchanged lines hidden (view full) ---

2027 if (count)
2028 *count = i + 1;
2029 return 0;
2030
2031bad:
2032 return ret;
2033}
2034
1119bool ceph_addr_is_blank(const struct ceph_entity_addr *addr)
1120{
1121 struct sockaddr_storage ss = addr->in_addr; /* align */
1122 struct in_addr *addr4 = &((struct sockaddr_in *)&ss)->sin_addr;
1123 struct in6_addr *addr6 = &((struct sockaddr_in6 *)&ss)->sin6_addr;
1124
1125 switch (ss.ss_family) {
1126 case AF_INET:

--- 192 unchanged lines hidden (view full) ---

1319 if (count)
1320 *count = i + 1;
1321 return 0;
1322
1323bad:
1324 return ret;
1325}
1326
2035static int process_banner(struct ceph_connection *con)
2036{
2037 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
2038
2039 dout("process_banner on %p\n", con);
2040
2041 if (verify_hello(con) < 0)
2042 return -1;
2043
2044 /*
2045 * Make sure the other end is who we wanted. note that the other
2046 * end may not yet know their ip address, so if it's 0.0.0.0, give
2047 * them the benefit of the doubt.
2048 */
2049 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
2050 sizeof(con->peer_addr)) != 0 &&
2051 !(ceph_addr_is_blank(&con->actual_peer_addr) &&
2052 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
2053 pr_warn("wrong peer, want %s/%u, got %s/%u\n",
2054 ceph_pr_addr(&con->peer_addr),
2055 le32_to_cpu(con->peer_addr.nonce),
2056 ceph_pr_addr(&con->actual_peer_addr),
2057 le32_to_cpu(con->actual_peer_addr.nonce));
2058 con->error_msg = "wrong peer at address";
2059 return -1;
2060 }
2061
2062 /*
2063 * did we learn our address?
2064 */
2065 if (ceph_addr_is_blank(my_addr)) {
2066 memcpy(&my_addr->in_addr,
2067 &con->peer_addr_for_me.in_addr,
2068 sizeof(con->peer_addr_for_me.in_addr));
2069 ceph_addr_set_port(my_addr, 0);
2070 ceph_encode_my_addr(con->msgr);
2071 dout("process_banner learned my addr is %s\n",
2072 ceph_pr_addr(my_addr));
2073 }
2074
2075 return 0;
2076}
2077
2078static int process_connect(struct ceph_connection *con)
2079{
2080 u64 sup_feat = from_msgr(con->msgr)->supported_features;
2081 u64 req_feat = from_msgr(con->msgr)->required_features;
2082 u64 server_feat = le64_to_cpu(con->in_reply.features);
2083 int ret;
2084
2085 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
2086
2087 if (con->auth) {
2088 int len = le32_to_cpu(con->in_reply.authorizer_len);
2089
2090 /*
2091 * Any connection that defines ->get_authorizer()
2092 * should also define ->add_authorizer_challenge() and
2093 * ->verify_authorizer_reply().
2094 *
2095 * See get_connect_authorizer().
2096 */
2097 if (con->in_reply.tag == CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
2098 ret = con->ops->add_authorizer_challenge(
2099 con, con->auth->authorizer_reply_buf, len);
2100 if (ret < 0)
2101 return ret;
2102
2103 con_out_kvec_reset(con);
2104 __prepare_write_connect(con);
2105 prepare_read_connect(con);
2106 return 0;
2107 }
2108
2109 if (len) {
2110 ret = con->ops->verify_authorizer_reply(con);
2111 if (ret < 0) {
2112 con->error_msg = "bad authorize reply";
2113 return ret;
2114 }
2115 }
2116 }
2117
2118 switch (con->in_reply.tag) {
2119 case CEPH_MSGR_TAG_FEATURES:
2120 pr_err("%s%lld %s feature set mismatch,"
2121 " my %llx < server's %llx, missing %llx\n",
2122 ENTITY_NAME(con->peer_name),
2123 ceph_pr_addr(&con->peer_addr),
2124 sup_feat, server_feat, server_feat & ~sup_feat);
2125 con->error_msg = "missing required protocol features";
2126 return -1;
2127
2128 case CEPH_MSGR_TAG_BADPROTOVER:
2129 pr_err("%s%lld %s protocol version mismatch,"
2130 " my %d != server's %d\n",
2131 ENTITY_NAME(con->peer_name),
2132 ceph_pr_addr(&con->peer_addr),
2133 le32_to_cpu(con->out_connect.protocol_version),
2134 le32_to_cpu(con->in_reply.protocol_version));
2135 con->error_msg = "protocol version mismatch";
2136 return -1;
2137
2138 case CEPH_MSGR_TAG_BADAUTHORIZER:
2139 con->auth_retry++;
2140 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
2141 con->auth_retry);
2142 if (con->auth_retry == 2) {
2143 con->error_msg = "connect authorization failure";
2144 return -1;
2145 }
2146 con_out_kvec_reset(con);
2147 ret = prepare_write_connect(con);
2148 if (ret < 0)
2149 return ret;
2150 prepare_read_connect(con);
2151 break;
2152
2153 case CEPH_MSGR_TAG_RESETSESSION:
2154 /*
2155 * If we connected with a large connect_seq but the peer
2156 * has no record of a session with us (no connection, or
2157 * connect_seq == 0), they will send RESETSESION to indicate
2158 * that they must have reset their session, and may have
2159 * dropped messages.
2160 */
2161 dout("process_connect got RESET peer seq %u\n",
2162 le32_to_cpu(con->in_reply.connect_seq));
2163 pr_info("%s%lld %s session reset\n",
2164 ENTITY_NAME(con->peer_name),
2165 ceph_pr_addr(&con->peer_addr));
2166 ceph_con_reset_session(con);
2167 con_out_kvec_reset(con);
2168 ret = prepare_write_connect(con);
2169 if (ret < 0)
2170 return ret;
2171 prepare_read_connect(con);
2172
2173 /* Tell ceph about it. */
2174 mutex_unlock(&con->mutex);
2175 if (con->ops->peer_reset)
2176 con->ops->peer_reset(con);
2177 mutex_lock(&con->mutex);
2178 if (con->state != CEPH_CON_S_V1_CONNECT_MSG)
2179 return -EAGAIN;
2180 break;
2181
2182 case CEPH_MSGR_TAG_RETRY_SESSION:
2183 /*
2184 * If we sent a smaller connect_seq than the peer has, try
2185 * again with a larger value.
2186 */
2187 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2188 le32_to_cpu(con->out_connect.connect_seq),
2189 le32_to_cpu(con->in_reply.connect_seq));
2190 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
2191 con_out_kvec_reset(con);
2192 ret = prepare_write_connect(con);
2193 if (ret < 0)
2194 return ret;
2195 prepare_read_connect(con);
2196 break;
2197
2198 case CEPH_MSGR_TAG_RETRY_GLOBAL:
2199 /*
2200 * If we sent a smaller global_seq than the peer has, try
2201 * again with a larger value.
2202 */
2203 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2204 con->peer_global_seq,
2205 le32_to_cpu(con->in_reply.global_seq));
2206 ceph_get_global_seq(con->msgr,
2207 le32_to_cpu(con->in_reply.global_seq));
2208 con_out_kvec_reset(con);
2209 ret = prepare_write_connect(con);
2210 if (ret < 0)
2211 return ret;
2212 prepare_read_connect(con);
2213 break;
2214
2215 case CEPH_MSGR_TAG_SEQ:
2216 case CEPH_MSGR_TAG_READY:
2217 if (req_feat & ~server_feat) {
2218 pr_err("%s%lld %s protocol feature mismatch,"
2219 " my required %llx > server's %llx, need %llx\n",
2220 ENTITY_NAME(con->peer_name),
2221 ceph_pr_addr(&con->peer_addr),
2222 req_feat, server_feat, req_feat & ~server_feat);
2223 con->error_msg = "missing required protocol features";
2224 return -1;
2225 }
2226
2227 WARN_ON(con->state != CEPH_CON_S_V1_CONNECT_MSG);
2228 con->state = CEPH_CON_S_OPEN;
2229 con->auth_retry = 0; /* we authenticated; clear flag */
2230 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
2231 con->connect_seq++;
2232 con->peer_features = server_feat;
2233 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2234 con->peer_global_seq,
2235 le32_to_cpu(con->in_reply.connect_seq),
2236 con->connect_seq);
2237 WARN_ON(con->connect_seq !=
2238 le32_to_cpu(con->in_reply.connect_seq));
2239
2240 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
2241 ceph_con_flag_set(con, CEPH_CON_F_LOSSYTX);
2242
2243 con->delay = 0; /* reset backoff memory */
2244
2245 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
2246 prepare_write_seq(con);
2247 prepare_read_seq(con);
2248 } else {
2249 prepare_read_tag(con);
2250 }
2251 break;
2252
2253 case CEPH_MSGR_TAG_WAIT:
2254 /*
2255 * If there is a connection race (we are opening
2256 * connections to each other), one of us may just have
2257 * to WAIT. This shouldn't happen if we are the
2258 * client.
2259 */
2260 con->error_msg = "protocol error, got WAIT as client";
2261 return -1;
2262
2263 default:
2264 con->error_msg = "protocol error, garbage tag during connect";
2265 return -1;
2266 }
2267 return 0;
2268}
2269
2270
2271/*
1327/*
2272 * read (part of) an ack
2273 */
2274static int read_partial_ack(struct ceph_connection *con)
2275{
2276 int size = sizeof (con->in_temp_ack);
2277 int end = size;
2278
2279 return read_partial(con, end, size, &con->in_temp_ack);
2280}
2281
2282/*
2283 * We can finally discard anything that's been acked.
2284 */
2285static void process_ack(struct ceph_connection *con)
2286{
2287 u64 ack = le64_to_cpu(con->in_temp_ack);
2288
2289 if (con->in_tag == CEPH_MSGR_TAG_ACK)
2290 ceph_con_discard_sent(con, ack);
2291 else
2292 ceph_con_discard_requeued(con, ack);
2293
2294 prepare_read_tag(con);
2295}
2296
2297
2298static int read_partial_message_section(struct ceph_connection *con,
2299 struct kvec *section,
2300 unsigned int sec_len, u32 *crc)
2301{
2302 int ret, left;
2303
2304 BUG_ON(!section);
2305
2306 while (section->iov_len < sec_len) {
2307 BUG_ON(section->iov_base == NULL);
2308 left = sec_len - section->iov_len;
2309 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
2310 section->iov_len, left);
2311 if (ret <= 0)
2312 return ret;
2313 section->iov_len += ret;
2314 }
2315 if (section->iov_len == sec_len)
2316 *crc = crc32c(0, section->iov_base, section->iov_len);
2317
2318 return 1;
2319}
2320
2321static int read_partial_msg_data(struct ceph_connection *con)
2322{
2323 struct ceph_msg *msg = con->in_msg;
2324 struct ceph_msg_data_cursor *cursor = &msg->cursor;
2325 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
2326 struct page *page;
2327 size_t page_offset;
2328 size_t length;
2329 u32 crc = 0;
2330 int ret;
2331
2332 if (!msg->num_data_items)
2333 return -EIO;
2334
2335 if (do_datacrc)
2336 crc = con->in_data_crc;
2337 while (cursor->total_resid) {
2338 if (!cursor->resid) {
2339 ceph_msg_data_advance(cursor, 0);
2340 continue;
2341 }
2342
2343 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
2344 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
2345 if (ret <= 0) {
2346 if (do_datacrc)
2347 con->in_data_crc = crc;
2348
2349 return ret;
2350 }
2351
2352 if (do_datacrc)
2353 crc = ceph_crc32c_page(crc, page, page_offset, ret);
2354 ceph_msg_data_advance(cursor, (size_t)ret);
2355 }
2356 if (do_datacrc)
2357 con->in_data_crc = crc;
2358
2359 return 1; /* must return > 0 to indicate success */
2360}
2361
2362/*
2363 * read (part of) a message.
2364 */
2365static int read_partial_message(struct ceph_connection *con)
2366{
2367 struct ceph_msg *m = con->in_msg;
2368 int size;
2369 int end;
2370 int ret;
2371 unsigned int front_len, middle_len, data_len;
2372 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
2373 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
2374 u64 seq;
2375 u32 crc;
2376
2377 dout("read_partial_message con %p msg %p\n", con, m);
2378
2379 /* header */
2380 size = sizeof (con->in_hdr);
2381 end = size;
2382 ret = read_partial(con, end, size, &con->in_hdr);
2383 if (ret <= 0)
2384 return ret;
2385
2386 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2387 if (cpu_to_le32(crc) != con->in_hdr.crc) {
2388 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2389 crc, con->in_hdr.crc);
2390 return -EBADMSG;
2391 }
2392
2393 front_len = le32_to_cpu(con->in_hdr.front_len);
2394 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2395 return -EIO;
2396 middle_len = le32_to_cpu(con->in_hdr.middle_len);
2397 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
2398 return -EIO;
2399 data_len = le32_to_cpu(con->in_hdr.data_len);
2400 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2401 return -EIO;
2402
2403 /* verify seq# */
2404 seq = le64_to_cpu(con->in_hdr.seq);
2405 if ((s64)seq - (s64)con->in_seq < 1) {
2406 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2407 ENTITY_NAME(con->peer_name),
2408 ceph_pr_addr(&con->peer_addr),
2409 seq, con->in_seq + 1);
2410 con->in_base_pos = -front_len - middle_len - data_len -
2411 sizeof_footer(con);
2412 con->in_tag = CEPH_MSGR_TAG_READY;
2413 return 1;
2414 } else if ((s64)seq - (s64)con->in_seq > 1) {
2415 pr_err("read_partial_message bad seq %lld expected %lld\n",
2416 seq, con->in_seq + 1);
2417 con->error_msg = "bad message sequence # for incoming message";
2418 return -EBADE;
2419 }
2420
2421 /* allocate message? */
2422 if (!con->in_msg) {
2423 int skip = 0;
2424
2425 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
2426 front_len, data_len);
2427 ret = ceph_con_in_msg_alloc(con, &con->in_hdr, &skip);
2428 if (ret < 0)
2429 return ret;
2430
2431 BUG_ON(!con->in_msg ^ skip);
2432 if (skip) {
2433 /* skip this message */
2434 dout("alloc_msg said skip message\n");
2435 con->in_base_pos = -front_len - middle_len - data_len -
2436 sizeof_footer(con);
2437 con->in_tag = CEPH_MSGR_TAG_READY;
2438 con->in_seq++;
2439 return 1;
2440 }
2441
2442 BUG_ON(!con->in_msg);
2443 BUG_ON(con->in_msg->con != con);
2444 m = con->in_msg;
2445 m->front.iov_len = 0; /* haven't read it yet */
2446 if (m->middle)
2447 m->middle->vec.iov_len = 0;
2448
2449 /* prepare for data payload, if any */
2450
2451 if (data_len)
2452 prepare_message_data(con->in_msg, data_len);
2453 }
2454
2455 /* front */
2456 ret = read_partial_message_section(con, &m->front, front_len,
2457 &con->in_front_crc);
2458 if (ret <= 0)
2459 return ret;
2460
2461 /* middle */
2462 if (m->middle) {
2463 ret = read_partial_message_section(con, &m->middle->vec,
2464 middle_len,
2465 &con->in_middle_crc);
2466 if (ret <= 0)
2467 return ret;
2468 }
2469
2470 /* (page) data */
2471 if (data_len) {
2472 ret = read_partial_msg_data(con);
2473 if (ret <= 0)
2474 return ret;
2475 }
2476
2477 /* footer */
2478 size = sizeof_footer(con);
2479 end += size;
2480 ret = read_partial(con, end, size, &m->footer);
2481 if (ret <= 0)
2482 return ret;
2483
2484 if (!need_sign) {
2485 m->footer.flags = m->old_footer.flags;
2486 m->footer.sig = 0;
2487 }
2488
2489 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2490 m, front_len, m->footer.front_crc, middle_len,
2491 m->footer.middle_crc, data_len, m->footer.data_crc);
2492
2493 /* crc ok? */
2494 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
2495 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2496 m, con->in_front_crc, m->footer.front_crc);
2497 return -EBADMSG;
2498 }
2499 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
2500 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2501 m, con->in_middle_crc, m->footer.middle_crc);
2502 return -EBADMSG;
2503 }
2504 if (do_datacrc &&
2505 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
2506 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
2507 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
2508 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
2509 return -EBADMSG;
2510 }
2511
2512 if (need_sign && con->ops->check_message_signature &&
2513 con->ops->check_message_signature(m)) {
2514 pr_err("read_partial_message %p signature check failed\n", m);
2515 return -EBADMSG;
2516 }
2517
2518 return 1; /* done! */
2519}
2520
2521/*
2522 * Process message. This happens in the worker thread. The callback should
2523 * be careful not to do anything that waits on other incoming messages or it
2524 * may deadlock.
2525 */
2526void ceph_con_process_message(struct ceph_connection *con)
2527{
2528 struct ceph_msg *msg = con->in_msg;
2529

--- 16 unchanged lines hidden (view full) ---

2546 le32_to_cpu(msg->hdr.middle_len),
2547 le32_to_cpu(msg->hdr.data_len),
2548 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2549 con->ops->dispatch(con, msg);
2550
2551 mutex_lock(&con->mutex);
2552}
2553
1328 * Process message. This happens in the worker thread. The callback should
1329 * be careful not to do anything that waits on other incoming messages or it
1330 * may deadlock.
1331 */
1332void ceph_con_process_message(struct ceph_connection *con)
1333{
1334 struct ceph_msg *msg = con->in_msg;
1335

--- 16 unchanged lines hidden (view full) ---

1352 le32_to_cpu(msg->hdr.middle_len),
1353 le32_to_cpu(msg->hdr.data_len),
1354 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1355 con->ops->dispatch(con, msg);
1356
1357 mutex_lock(&con->mutex);
1358}
1359
2554static int read_keepalive_ack(struct ceph_connection *con)
2555{
2556 struct ceph_timespec ceph_ts;
2557 size_t size = sizeof(ceph_ts);
2558 int ret = read_partial(con, size, size, &ceph_ts);
2559 if (ret <= 0)
2560 return ret;
2561 ceph_decode_timespec64(&con->last_keepalive_ack, &ceph_ts);
2562 prepare_read_tag(con);
2563 return 1;
2564}
2565
2566/*
1360/*
2567 * Write something to the socket. Called in a worker thread when the
2568 * socket appears to be writeable and we have something ready to send.
2569 */
2570int ceph_con_v1_try_write(struct ceph_connection *con)
2571{
2572 int ret = 1;
2573
2574 dout("try_write start %p state %d\n", con, con->state);
2575 if (con->state != CEPH_CON_S_PREOPEN &&
2576 con->state != CEPH_CON_S_V1_BANNER &&
2577 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
2578 con->state != CEPH_CON_S_OPEN)
2579 return 0;
2580
2581 /* open the socket first? */
2582 if (con->state == CEPH_CON_S_PREOPEN) {
2583 BUG_ON(con->sock);
2584 con->state = CEPH_CON_S_V1_BANNER;
2585
2586 con_out_kvec_reset(con);
2587 prepare_write_banner(con);
2588 prepare_read_banner(con);
2589
2590 BUG_ON(con->in_msg);
2591 con->in_tag = CEPH_MSGR_TAG_READY;
2592 dout("try_write initiating connect on %p new state %d\n",
2593 con, con->state);
2594 ret = ceph_tcp_connect(con);
2595 if (ret < 0) {
2596 con->error_msg = "connect error";
2597 goto out;
2598 }
2599 }
2600
2601more:
2602 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2603 BUG_ON(!con->sock);
2604
2605 /* kvec data queued? */
2606 if (con->out_kvec_left) {
2607 ret = write_partial_kvec(con);
2608 if (ret <= 0)
2609 goto out;
2610 }
2611 if (con->out_skip) {
2612 ret = write_partial_skip(con);
2613 if (ret <= 0)
2614 goto out;
2615 }
2616
2617 /* msg pages? */
2618 if (con->out_msg) {
2619 if (con->out_msg_done) {
2620 ceph_msg_put(con->out_msg);
2621 con->out_msg = NULL; /* we're done with this one */
2622 goto do_next;
2623 }
2624
2625 ret = write_partial_message_data(con);
2626 if (ret == 1)
2627 goto more; /* we need to send the footer, too! */
2628 if (ret == 0)
2629 goto out;
2630 if (ret < 0) {
2631 dout("try_write write_partial_message_data err %d\n",
2632 ret);
2633 goto out;
2634 }
2635 }
2636
2637do_next:
2638 if (con->state == CEPH_CON_S_OPEN) {
2639 if (ceph_con_flag_test_and_clear(con,
2640 CEPH_CON_F_KEEPALIVE_PENDING)) {
2641 prepare_write_keepalive(con);
2642 goto more;
2643 }
2644 /* is anything else pending? */
2645 if (!list_empty(&con->out_queue)) {
2646 prepare_write_message(con);
2647 goto more;
2648 }
2649 if (con->in_seq > con->in_seq_acked) {
2650 prepare_write_ack(con);
2651 goto more;
2652 }
2653 }
2654
2655 /* Nothing to do! */
2656 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING);
2657 dout("try_write nothing else to write.\n");
2658 ret = 0;
2659out:
2660 dout("try_write done on %p ret %d\n", con, ret);
2661 return ret;
2662}
2663
2664/*
2665 * Read what we can from the socket.
2666 */
2667int ceph_con_v1_try_read(struct ceph_connection *con)
2668{
2669 int ret = -1;
2670
2671more:
2672 dout("try_read start %p state %d\n", con, con->state);
2673 if (con->state != CEPH_CON_S_V1_BANNER &&
2674 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
2675 con->state != CEPH_CON_S_OPEN)
2676 return 0;
2677
2678 BUG_ON(!con->sock);
2679
2680 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2681 con->in_base_pos);
2682
2683 if (con->state == CEPH_CON_S_V1_BANNER) {
2684 ret = read_partial_banner(con);
2685 if (ret <= 0)
2686 goto out;
2687 ret = process_banner(con);
2688 if (ret < 0)
2689 goto out;
2690
2691 con->state = CEPH_CON_S_V1_CONNECT_MSG;
2692
2693 /*
2694 * Received banner is good, exchange connection info.
2695 * Do not reset out_kvec, as sending our banner raced
2696 * with receiving peer banner after connect completed.
2697 */
2698 ret = prepare_write_connect(con);
2699 if (ret < 0)
2700 goto out;
2701 prepare_read_connect(con);
2702
2703 /* Send connection info before awaiting response */
2704 goto out;
2705 }
2706
2707 if (con->state == CEPH_CON_S_V1_CONNECT_MSG) {
2708 ret = read_partial_connect(con);
2709 if (ret <= 0)
2710 goto out;
2711 ret = process_connect(con);
2712 if (ret < 0)
2713 goto out;
2714 goto more;
2715 }
2716
2717 WARN_ON(con->state != CEPH_CON_S_OPEN);
2718
2719 if (con->in_base_pos < 0) {
2720 /*
2721 * skipping + discarding content.
2722 */
2723 ret = ceph_tcp_recvmsg(con->sock, NULL, -con->in_base_pos);
2724 if (ret <= 0)
2725 goto out;
2726 dout("skipped %d / %d bytes\n", ret, -con->in_base_pos);
2727 con->in_base_pos += ret;
2728 if (con->in_base_pos)
2729 goto more;
2730 }
2731 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2732 /*
2733 * what's next?
2734 */
2735 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2736 if (ret <= 0)
2737 goto out;
2738 dout("try_read got tag %d\n", (int)con->in_tag);
2739 switch (con->in_tag) {
2740 case CEPH_MSGR_TAG_MSG:
2741 prepare_read_message(con);
2742 break;
2743 case CEPH_MSGR_TAG_ACK:
2744 prepare_read_ack(con);
2745 break;
2746 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
2747 prepare_read_keepalive_ack(con);
2748 break;
2749 case CEPH_MSGR_TAG_CLOSE:
2750 ceph_con_close_socket(con);
2751 con->state = CEPH_CON_S_CLOSED;
2752 goto out;
2753 default:
2754 goto bad_tag;
2755 }
2756 }
2757 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2758 ret = read_partial_message(con);
2759 if (ret <= 0) {
2760 switch (ret) {
2761 case -EBADMSG:
2762 con->error_msg = "bad crc/signature";
2763 fallthrough;
2764 case -EBADE:
2765 ret = -EIO;
2766 break;
2767 case -EIO:
2768 con->error_msg = "io error";
2769 break;
2770 }
2771 goto out;
2772 }
2773 if (con->in_tag == CEPH_MSGR_TAG_READY)
2774 goto more;
2775 ceph_con_process_message(con);
2776 if (con->state == CEPH_CON_S_OPEN)
2777 prepare_read_tag(con);
2778 goto more;
2779 }
2780 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
2781 con->in_tag == CEPH_MSGR_TAG_SEQ) {
2782 /*
2783 * the final handshake seq exchange is semantically
2784 * equivalent to an ACK
2785 */
2786 ret = read_partial_ack(con);
2787 if (ret <= 0)
2788 goto out;
2789 process_ack(con);
2790 goto more;
2791 }
2792 if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
2793 ret = read_keepalive_ack(con);
2794 if (ret <= 0)
2795 goto out;
2796 goto more;
2797 }
2798
2799out:
2800 dout("try_read done on %p ret %d\n", con, ret);
2801 return ret;
2802
2803bad_tag:
2804 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2805 con->error_msg = "protocol error, garbage tag";
2806 ret = -1;
2807 goto out;
2808}
2809
2810
2811/*
2812 * Atomically queue work on a connection after the specified delay.
2813 * Bump @con reference to avoid races with connection teardown.
2814 * Returns 0 if work was queued, or an error code otherwise.
2815 */
2816static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
2817{
2818 if (!con->ops->get(con)) {
2819 dout("%s %p ref count 0\n", __func__, con);

--- 201 unchanged lines hidden (view full) ---

3021 if (con->delay > MAX_DELAY_INTERVAL)
3022 con->delay = MAX_DELAY_INTERVAL;
3023 }
3024 ceph_con_flag_set(con, CEPH_CON_F_BACKOFF);
3025 queue_con(con);
3026 }
3027}
3028
1361 * Atomically queue work on a connection after the specified delay.
1362 * Bump @con reference to avoid races with connection teardown.
1363 * Returns 0 if work was queued, or an error code otherwise.
1364 */
1365static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
1366{
1367 if (!con->ops->get(con)) {
1368 dout("%s %p ref count 0\n", __func__, con);

--- 201 unchanged lines hidden (view full) ---

1570 if (con->delay > MAX_DELAY_INTERVAL)
1571 con->delay = MAX_DELAY_INTERVAL;
1572 }
1573 ceph_con_flag_set(con, CEPH_CON_F_BACKOFF);
1574 queue_con(con);
1575 }
1576}
1577
3029
3030void ceph_messenger_reset_nonce(struct ceph_messenger *msgr)
3031{
3032 u32 nonce = le32_to_cpu(msgr->inst.addr.nonce) + 1000000;
3033 msgr->inst.addr.nonce = cpu_to_le32(nonce);
3034 ceph_encode_my_addr(msgr);
3035}
3036
3037/*

--- 88 unchanged lines hidden (view full) ---

3126
3127 /* if there wasn't anything waiting to send before, queue
3128 * new work */
3129 if (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING))
3130 queue_con(con);
3131}
3132EXPORT_SYMBOL(ceph_con_send);
3133
1578void ceph_messenger_reset_nonce(struct ceph_messenger *msgr)
1579{
1580 u32 nonce = le32_to_cpu(msgr->inst.addr.nonce) + 1000000;
1581 msgr->inst.addr.nonce = cpu_to_le32(nonce);
1582 ceph_encode_my_addr(msgr);
1583}
1584
1585/*

--- 88 unchanged lines hidden (view full) ---

1674
1675 /* if there wasn't anything waiting to send before, queue
1676 * new work */
1677 if (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING))
1678 queue_con(con);
1679}
1680EXPORT_SYMBOL(ceph_con_send);
1681
3134void ceph_con_v1_revoke(struct ceph_connection *con)
3135{
3136 struct ceph_msg *msg = con->out_msg;
3137
3138 WARN_ON(con->out_skip);
3139 /* footer */
3140 if (con->out_msg_done) {
3141 con->out_skip += con_out_kvec_skip(con);
3142 } else {
3143 WARN_ON(!msg->data_length);
3144 con->out_skip += sizeof_footer(con);
3145 }
3146 /* data, middle, front */
3147 if (msg->data_length)
3148 con->out_skip += msg->cursor.total_resid;
3149 if (msg->middle)
3150 con->out_skip += con_out_kvec_skip(con);
3151 con->out_skip += con_out_kvec_skip(con);
3152
3153 dout("%s con %p out_kvec_bytes %d out_skip %d\n", __func__, con,
3154 con->out_kvec_bytes, con->out_skip);
3155}
3156
3157/*
3158 * Revoke a message that was previously queued for send
3159 */
3160void ceph_msg_revoke(struct ceph_msg *msg)
3161{
3162 struct ceph_connection *con = msg->con;
3163
3164 if (!con) {

--- 21 unchanged lines hidden (view full) ---

3186 con->out_msg = NULL;
3187 } else {
3188 dout("%s con %p msg %p not current, out_msg %p\n", __func__,
3189 con, msg, con->out_msg);
3190 }
3191 mutex_unlock(&con->mutex);
3192}
3193
1682/*
1683 * Revoke a message that was previously queued for send
1684 */
1685void ceph_msg_revoke(struct ceph_msg *msg)
1686{
1687 struct ceph_connection *con = msg->con;
1688
1689 if (!con) {

--- 21 unchanged lines hidden (view full) ---

1711 con->out_msg = NULL;
1712 } else {
1713 dout("%s con %p msg %p not current, out_msg %p\n", __func__,
1714 con, msg, con->out_msg);
1715 }
1716 mutex_unlock(&con->mutex);
1717}
1718
3194void ceph_con_v1_revoke_incoming(struct ceph_connection *con)
3195{
3196 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
3197 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
3198 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
3199
3200 /* skip rest of message */
3201 con->in_base_pos = con->in_base_pos -
3202 sizeof(struct ceph_msg_header) -
3203 front_len -
3204 middle_len -
3205 data_len -
3206 sizeof(struct ceph_msg_footer);
3207
3208 con->in_tag = CEPH_MSGR_TAG_READY;
3209 con->in_seq++;
3210
3211 dout("%s con %p in_base_pos %d\n", __func__, con, con->in_base_pos);
3212}
3213
3214/*
3215 * Revoke a message that we may be reading data into
3216 */
3217void ceph_msg_revoke_incoming(struct ceph_msg *msg)
3218{
3219 struct ceph_connection *con = msg->con;
3220
3221 if (!con) {

--- 389 unchanged lines hidden --- 		1719/*
1720 * Revoke a message that we may be reading data into
1721 */
1722void ceph_msg_revoke_incoming(struct ceph_msg *msg)
1723{
1724 struct ceph_connection *con = msg->con;
1725
1726 if (!con) {

--- 389 unchanged lines hidden ---