1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/crc32c.h> 4 #include <linux/ctype.h> 5 #include <linux/highmem.h> 6 #include <linux/inet.h> 7 #include <linux/kthread.h> 8 #include <linux/net.h> 9 #include <linux/slab.h> 10 #include <linux/socket.h> 11 #include <linux/string.h> 12 #ifdef CONFIG_BLOCK 13 #include <linux/bio.h> 14 #endif /* CONFIG_BLOCK */ 15 #include <linux/dns_resolver.h> 16 #include <net/tcp.h> 17 18 #include <linux/ceph/ceph_features.h> 19 #include <linux/ceph/libceph.h> 20 #include <linux/ceph/messenger.h> 21 #include <linux/ceph/decode.h> 22 #include <linux/ceph/pagelist.h> 23 #include <linux/export.h> 24 25 #define list_entry_next(pos, member) \ 26 list_entry(pos->member.next, typeof(*pos), member) 27 28 /* 29 * Ceph uses the messenger to exchange ceph_msg messages with other 30 * hosts in the system. The messenger provides ordered and reliable 31 * delivery. We tolerate TCP disconnects by reconnecting (with 32 * exponential backoff) in the case of a fault (disconnection, bad 33 * crc, protocol error). Acks allow sent messages to be discarded by 34 * the sender. 35 */ 36 37 /* 38 * We track the state of the socket on a given connection using 39 * values defined below. The transition to a new socket state is 40 * handled by a function which verifies we aren't coming from an 41 * unexpected state. 42 * 43 * -------- 44 * | NEW* | transient initial state 45 * -------- 46 * | con_sock_state_init() 47 * v 48 * ---------- 49 * | CLOSED | initialized, but no socket (and no 50 * ---------- TCP connection) 51 * ^ \ 52 * | \ con_sock_state_connecting() 53 * | ---------------------- 54 * | \ 55 * + con_sock_state_closed() \ 56 * |+--------------------------- \ 57 * | \ \ \ 58 * | ----------- \ \ 59 * | | CLOSING | socket event; \ \ 60 * | ----------- await close \ \ 61 * | ^ \ | 62 * | | \ | 63 * | + con_sock_state_closing() \ | 64 * | / \ | | 65 * | / --------------- | | 66 * | / \ v v 67 * | / -------------- 68 * | / -----------------| CONNECTING | socket created, TCP 69 * | | / -------------- connect initiated 70 * | | | con_sock_state_connected() 71 * | | v 72 * ------------- 73 * | CONNECTED | TCP connection established 74 * ------------- 75 * 76 * State values for ceph_connection->sock_state; NEW is assumed to be 0. 77 */ 78 79 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ 80 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ 81 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ 82 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ 83 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ 84 85 /* 86 * connection states 87 */ 88 #define CON_STATE_CLOSED 1 /* -> PREOPEN */ 89 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ 90 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ 91 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ 92 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ 93 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ 94 95 /* 96 * ceph_connection flag bits 97 */ 98 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop 99 * messages on errors */ 100 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ 101 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ 102 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ 103 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ 104 105 static bool con_flag_valid(unsigned long con_flag) 106 { 107 switch (con_flag) { 108 case CON_FLAG_LOSSYTX: 109 case CON_FLAG_KEEPALIVE_PENDING: 110 case CON_FLAG_WRITE_PENDING: 111 case CON_FLAG_SOCK_CLOSED: 112 case CON_FLAG_BACKOFF: 113 return true; 114 default: 115 return false; 116 } 117 } 118 119 static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) 120 { 121 BUG_ON(!con_flag_valid(con_flag)); 122 123 clear_bit(con_flag, &con->flags); 124 } 125 126 static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) 127 { 128 BUG_ON(!con_flag_valid(con_flag)); 129 130 set_bit(con_flag, &con->flags); 131 } 132 133 static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) 134 { 135 BUG_ON(!con_flag_valid(con_flag)); 136 137 return test_bit(con_flag, &con->flags); 138 } 139 140 static bool con_flag_test_and_clear(struct ceph_connection *con, 141 unsigned long con_flag) 142 { 143 BUG_ON(!con_flag_valid(con_flag)); 144 145 return test_and_clear_bit(con_flag, &con->flags); 146 } 147 148 static bool con_flag_test_and_set(struct ceph_connection *con, 149 unsigned long con_flag) 150 { 151 BUG_ON(!con_flag_valid(con_flag)); 152 153 return test_and_set_bit(con_flag, &con->flags); 154 } 155 156 /* Slab caches for frequently-allocated structures */ 157 158 static struct kmem_cache *ceph_msg_cache; 159 static struct kmem_cache *ceph_msg_data_cache; 160 161 /* static tag bytes (protocol control messages) */ 162 static char tag_msg = CEPH_MSGR_TAG_MSG; 163 static char tag_ack = CEPH_MSGR_TAG_ACK; 164 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; 165 166 #ifdef CONFIG_LOCKDEP 167 static struct lock_class_key socket_class; 168 #endif 169 170 /* 171 * When skipping (ignoring) a block of input we read it into a "skip 172 * buffer," which is this many bytes in size. 173 */ 174 #define SKIP_BUF_SIZE 1024 175 176 static void queue_con(struct ceph_connection *con); 177 static void cancel_con(struct ceph_connection *con); 178 static void con_work(struct work_struct *); 179 static void con_fault(struct ceph_connection *con); 180 181 /* 182 * Nicely render a sockaddr as a string. An array of formatted 183 * strings is used, to approximate reentrancy. 184 */ 185 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ 186 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) 187 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) 188 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ 189 190 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; 191 static atomic_t addr_str_seq = ATOMIC_INIT(0); 192 193 static struct page *zero_page; /* used in certain error cases */ 194 195 const char *ceph_pr_addr(const struct sockaddr_storage *ss) 196 { 197 int i; 198 char *s; 199 struct sockaddr_in *in4 = (struct sockaddr_in *) ss; 200 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; 201 202 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; 203 s = addr_str[i]; 204 205 switch (ss->ss_family) { 206 case AF_INET: 207 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, 208 ntohs(in4->sin_port)); 209 break; 210 211 case AF_INET6: 212 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, 213 ntohs(in6->sin6_port)); 214 break; 215 216 default: 217 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", 218 ss->ss_family); 219 } 220 221 return s; 222 } 223 EXPORT_SYMBOL(ceph_pr_addr); 224 225 static void encode_my_addr(struct ceph_messenger *msgr) 226 { 227 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); 228 ceph_encode_addr(&msgr->my_enc_addr); 229 } 230 231 /* 232 * work queue for all reading and writing to/from the socket. 233 */ 234 static struct workqueue_struct *ceph_msgr_wq; 235 236 static int ceph_msgr_slab_init(void) 237 { 238 BUG_ON(ceph_msg_cache); 239 ceph_msg_cache = kmem_cache_create("ceph_msg", 240 sizeof (struct ceph_msg), 241 __alignof__(struct ceph_msg), 0, NULL); 242 243 if (!ceph_msg_cache) 244 return -ENOMEM; 245 246 BUG_ON(ceph_msg_data_cache); 247 ceph_msg_data_cache = kmem_cache_create("ceph_msg_data", 248 sizeof (struct ceph_msg_data), 249 __alignof__(struct ceph_msg_data), 250 0, NULL); 251 if (ceph_msg_data_cache) 252 return 0; 253 254 kmem_cache_destroy(ceph_msg_cache); 255 ceph_msg_cache = NULL; 256 257 return -ENOMEM; 258 } 259 260 static void ceph_msgr_slab_exit(void) 261 { 262 BUG_ON(!ceph_msg_data_cache); 263 kmem_cache_destroy(ceph_msg_data_cache); 264 ceph_msg_data_cache = NULL; 265 266 BUG_ON(!ceph_msg_cache); 267 kmem_cache_destroy(ceph_msg_cache); 268 ceph_msg_cache = NULL; 269 } 270 271 static void _ceph_msgr_exit(void) 272 { 273 if (ceph_msgr_wq) { 274 destroy_workqueue(ceph_msgr_wq); 275 ceph_msgr_wq = NULL; 276 } 277 278 ceph_msgr_slab_exit(); 279 280 BUG_ON(zero_page == NULL); 281 page_cache_release(zero_page); 282 zero_page = NULL; 283 } 284 285 int ceph_msgr_init(void) 286 { 287 BUG_ON(zero_page != NULL); 288 zero_page = ZERO_PAGE(0); 289 page_cache_get(zero_page); 290 291 if (ceph_msgr_slab_init()) 292 return -ENOMEM; 293 294 /* 295 * The number of active work items is limited by the number of 296 * connections, so leave @max_active at default. 297 */ 298 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); 299 if (ceph_msgr_wq) 300 return 0; 301 302 pr_err("msgr_init failed to create workqueue\n"); 303 _ceph_msgr_exit(); 304 305 return -ENOMEM; 306 } 307 EXPORT_SYMBOL(ceph_msgr_init); 308 309 void ceph_msgr_exit(void) 310 { 311 BUG_ON(ceph_msgr_wq == NULL); 312 313 _ceph_msgr_exit(); 314 } 315 EXPORT_SYMBOL(ceph_msgr_exit); 316 317 void ceph_msgr_flush(void) 318 { 319 flush_workqueue(ceph_msgr_wq); 320 } 321 EXPORT_SYMBOL(ceph_msgr_flush); 322 323 /* Connection socket state transition functions */ 324 325 static void con_sock_state_init(struct ceph_connection *con) 326 { 327 int old_state; 328 329 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); 330 if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) 331 printk("%s: unexpected old state %d\n", __func__, old_state); 332 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 333 CON_SOCK_STATE_CLOSED); 334 } 335 336 static void con_sock_state_connecting(struct ceph_connection *con) 337 { 338 int old_state; 339 340 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); 341 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) 342 printk("%s: unexpected old state %d\n", __func__, old_state); 343 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 344 CON_SOCK_STATE_CONNECTING); 345 } 346 347 static void con_sock_state_connected(struct ceph_connection *con) 348 { 349 int old_state; 350 351 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); 352 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) 353 printk("%s: unexpected old state %d\n", __func__, old_state); 354 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 355 CON_SOCK_STATE_CONNECTED); 356 } 357 358 static void con_sock_state_closing(struct ceph_connection *con) 359 { 360 int old_state; 361 362 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); 363 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && 364 old_state != CON_SOCK_STATE_CONNECTED && 365 old_state != CON_SOCK_STATE_CLOSING)) 366 printk("%s: unexpected old state %d\n", __func__, old_state); 367 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 368 CON_SOCK_STATE_CLOSING); 369 } 370 371 static void con_sock_state_closed(struct ceph_connection *con) 372 { 373 int old_state; 374 375 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); 376 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && 377 old_state != CON_SOCK_STATE_CLOSING && 378 old_state != CON_SOCK_STATE_CONNECTING && 379 old_state != CON_SOCK_STATE_CLOSED)) 380 printk("%s: unexpected old state %d\n", __func__, old_state); 381 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 382 CON_SOCK_STATE_CLOSED); 383 } 384 385 /* 386 * socket callback functions 387 */ 388 389 /* data available on socket, or listen socket received a connect */ 390 static void ceph_sock_data_ready(struct sock *sk) 391 { 392 struct ceph_connection *con = sk->sk_user_data; 393 if (atomic_read(&con->msgr->stopping)) { 394 return; 395 } 396 397 if (sk->sk_state != TCP_CLOSE_WAIT) { 398 dout("%s on %p state = %lu, queueing work\n", __func__, 399 con, con->state); 400 queue_con(con); 401 } 402 } 403 404 /* socket has buffer space for writing */ 405 static void ceph_sock_write_space(struct sock *sk) 406 { 407 struct ceph_connection *con = sk->sk_user_data; 408 409 /* only queue to workqueue if there is data we want to write, 410 * and there is sufficient space in the socket buffer to accept 411 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() 412 * doesn't get called again until try_write() fills the socket 413 * buffer. See net/ipv4/tcp_input.c:tcp_check_space() 414 * and net/core/stream.c:sk_stream_write_space(). 415 */ 416 if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { 417 if (sk_stream_is_writeable(sk)) { 418 dout("%s %p queueing write work\n", __func__, con); 419 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 420 queue_con(con); 421 } 422 } else { 423 dout("%s %p nothing to write\n", __func__, con); 424 } 425 } 426 427 /* socket's state has changed */ 428 static void ceph_sock_state_change(struct sock *sk) 429 { 430 struct ceph_connection *con = sk->sk_user_data; 431 432 dout("%s %p state = %lu sk_state = %u\n", __func__, 433 con, con->state, sk->sk_state); 434 435 switch (sk->sk_state) { 436 case TCP_CLOSE: 437 dout("%s TCP_CLOSE\n", __func__); 438 case TCP_CLOSE_WAIT: 439 dout("%s TCP_CLOSE_WAIT\n", __func__); 440 con_sock_state_closing(con); 441 con_flag_set(con, CON_FLAG_SOCK_CLOSED); 442 queue_con(con); 443 break; 444 case TCP_ESTABLISHED: 445 dout("%s TCP_ESTABLISHED\n", __func__); 446 con_sock_state_connected(con); 447 queue_con(con); 448 break; 449 default: /* Everything else is uninteresting */ 450 break; 451 } 452 } 453 454 /* 455 * set up socket callbacks 456 */ 457 static void set_sock_callbacks(struct socket *sock, 458 struct ceph_connection *con) 459 { 460 struct sock *sk = sock->sk; 461 sk->sk_user_data = con; 462 sk->sk_data_ready = ceph_sock_data_ready; 463 sk->sk_write_space = ceph_sock_write_space; 464 sk->sk_state_change = ceph_sock_state_change; 465 } 466 467 468 /* 469 * socket helpers 470 */ 471 472 /* 473 * initiate connection to a remote socket. 474 */ 475 static int ceph_tcp_connect(struct ceph_connection *con) 476 { 477 struct sockaddr_storage *paddr = &con->peer_addr.in_addr; 478 struct socket *sock; 479 int ret; 480 481 BUG_ON(con->sock); 482 ret = sock_create_kern(&init_net, con->peer_addr.in_addr.ss_family, 483 SOCK_STREAM, IPPROTO_TCP, &sock); 484 if (ret) 485 return ret; 486 sock->sk->sk_allocation = GFP_NOFS; 487 488 #ifdef CONFIG_LOCKDEP 489 lockdep_set_class(&sock->sk->sk_lock, &socket_class); 490 #endif 491 492 set_sock_callbacks(sock, con); 493 494 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); 495 496 con_sock_state_connecting(con); 497 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), 498 O_NONBLOCK); 499 if (ret == -EINPROGRESS) { 500 dout("connect %s EINPROGRESS sk_state = %u\n", 501 ceph_pr_addr(&con->peer_addr.in_addr), 502 sock->sk->sk_state); 503 } else if (ret < 0) { 504 pr_err("connect %s error %d\n", 505 ceph_pr_addr(&con->peer_addr.in_addr), ret); 506 sock_release(sock); 507 return ret; 508 } 509 510 if (con->msgr->tcp_nodelay) { 511 int optval = 1; 512 513 ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, 514 (char *)&optval, sizeof(optval)); 515 if (ret) 516 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d", 517 ret); 518 } 519 520 con->sock = sock; 521 return 0; 522 } 523 524 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) 525 { 526 struct kvec iov = {buf, len}; 527 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; 528 int r; 529 530 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); 531 if (r == -EAGAIN) 532 r = 0; 533 return r; 534 } 535 536 static int ceph_tcp_recvpage(struct socket *sock, struct page *page, 537 int page_offset, size_t length) 538 { 539 void *kaddr; 540 int ret; 541 542 BUG_ON(page_offset + length > PAGE_SIZE); 543 544 kaddr = kmap(page); 545 BUG_ON(!kaddr); 546 ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length); 547 kunmap(page); 548 549 return ret; 550 } 551 552 /* 553 * write something. @more is true if caller will be sending more data 554 * shortly. 555 */ 556 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, 557 size_t kvlen, size_t len, int more) 558 { 559 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; 560 int r; 561 562 if (more) 563 msg.msg_flags |= MSG_MORE; 564 else 565 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ 566 567 r = kernel_sendmsg(sock, &msg, iov, kvlen, len); 568 if (r == -EAGAIN) 569 r = 0; 570 return r; 571 } 572 573 static int __ceph_tcp_sendpage(struct socket *sock, struct page *page, 574 int offset, size_t size, bool more) 575 { 576 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); 577 int ret; 578 579 ret = kernel_sendpage(sock, page, offset, size, flags); 580 if (ret == -EAGAIN) 581 ret = 0; 582 583 return ret; 584 } 585 586 static int ceph_tcp_sendpage(struct socket *sock, struct page *page, 587 int offset, size_t size, bool more) 588 { 589 int ret; 590 struct kvec iov; 591 592 /* sendpage cannot properly handle pages with page_count == 0, 593 * we need to fallback to sendmsg if that's the case */ 594 if (page_count(page) >= 1) 595 return __ceph_tcp_sendpage(sock, page, offset, size, more); 596 597 iov.iov_base = kmap(page) + offset; 598 iov.iov_len = size; 599 ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more); 600 kunmap(page); 601 602 return ret; 603 } 604 605 /* 606 * Shutdown/close the socket for the given connection. 607 */ 608 static int con_close_socket(struct ceph_connection *con) 609 { 610 int rc = 0; 611 612 dout("con_close_socket on %p sock %p\n", con, con->sock); 613 if (con->sock) { 614 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); 615 sock_release(con->sock); 616 con->sock = NULL; 617 } 618 619 /* 620 * Forcibly clear the SOCK_CLOSED flag. It gets set 621 * independent of the connection mutex, and we could have 622 * received a socket close event before we had the chance to 623 * shut the socket down. 624 */ 625 con_flag_clear(con, CON_FLAG_SOCK_CLOSED); 626 627 con_sock_state_closed(con); 628 return rc; 629 } 630 631 /* 632 * Reset a connection. Discard all incoming and outgoing messages 633 * and clear *_seq state. 634 */ 635 static void ceph_msg_remove(struct ceph_msg *msg) 636 { 637 list_del_init(&msg->list_head); 638 BUG_ON(msg->con == NULL); 639 msg->con->ops->put(msg->con); 640 msg->con = NULL; 641 642 ceph_msg_put(msg); 643 } 644 static void ceph_msg_remove_list(struct list_head *head) 645 { 646 while (!list_empty(head)) { 647 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, 648 list_head); 649 ceph_msg_remove(msg); 650 } 651 } 652 653 static void reset_connection(struct ceph_connection *con) 654 { 655 /* reset connection, out_queue, msg_ and connect_seq */ 656 /* discard existing out_queue and msg_seq */ 657 dout("reset_connection %p\n", con); 658 ceph_msg_remove_list(&con->out_queue); 659 ceph_msg_remove_list(&con->out_sent); 660 661 if (con->in_msg) { 662 BUG_ON(con->in_msg->con != con); 663 con->in_msg->con = NULL; 664 ceph_msg_put(con->in_msg); 665 con->in_msg = NULL; 666 con->ops->put(con); 667 } 668 669 con->connect_seq = 0; 670 con->out_seq = 0; 671 if (con->out_msg) { 672 ceph_msg_put(con->out_msg); 673 con->out_msg = NULL; 674 } 675 con->in_seq = 0; 676 con->in_seq_acked = 0; 677 } 678 679 /* 680 * mark a peer down. drop any open connections. 681 */ 682 void ceph_con_close(struct ceph_connection *con) 683 { 684 mutex_lock(&con->mutex); 685 dout("con_close %p peer %s\n", con, 686 ceph_pr_addr(&con->peer_addr.in_addr)); 687 con->state = CON_STATE_CLOSED; 688 689 con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ 690 con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); 691 con_flag_clear(con, CON_FLAG_WRITE_PENDING); 692 con_flag_clear(con, CON_FLAG_BACKOFF); 693 694 reset_connection(con); 695 con->peer_global_seq = 0; 696 cancel_con(con); 697 con_close_socket(con); 698 mutex_unlock(&con->mutex); 699 } 700 EXPORT_SYMBOL(ceph_con_close); 701 702 /* 703 * Reopen a closed connection, with a new peer address. 704 */ 705 void ceph_con_open(struct ceph_connection *con, 706 __u8 entity_type, __u64 entity_num, 707 struct ceph_entity_addr *addr) 708 { 709 mutex_lock(&con->mutex); 710 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); 711 712 WARN_ON(con->state != CON_STATE_CLOSED); 713 con->state = CON_STATE_PREOPEN; 714 715 con->peer_name.type = (__u8) entity_type; 716 con->peer_name.num = cpu_to_le64(entity_num); 717 718 memcpy(&con->peer_addr, addr, sizeof(*addr)); 719 con->delay = 0; /* reset backoff memory */ 720 mutex_unlock(&con->mutex); 721 queue_con(con); 722 } 723 EXPORT_SYMBOL(ceph_con_open); 724 725 /* 726 * return true if this connection ever successfully opened 727 */ 728 bool ceph_con_opened(struct ceph_connection *con) 729 { 730 return con->connect_seq > 0; 731 } 732 733 /* 734 * initialize a new connection. 735 */ 736 void ceph_con_init(struct ceph_connection *con, void *private, 737 const struct ceph_connection_operations *ops, 738 struct ceph_messenger *msgr) 739 { 740 dout("con_init %p\n", con); 741 memset(con, 0, sizeof(*con)); 742 con->private = private; 743 con->ops = ops; 744 con->msgr = msgr; 745 746 con_sock_state_init(con); 747 748 mutex_init(&con->mutex); 749 INIT_LIST_HEAD(&con->out_queue); 750 INIT_LIST_HEAD(&con->out_sent); 751 INIT_DELAYED_WORK(&con->work, con_work); 752 753 con->state = CON_STATE_CLOSED; 754 } 755 EXPORT_SYMBOL(ceph_con_init); 756 757 758 /* 759 * We maintain a global counter to order connection attempts. Get 760 * a unique seq greater than @gt. 761 */ 762 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) 763 { 764 u32 ret; 765 766 spin_lock(&msgr->global_seq_lock); 767 if (msgr->global_seq < gt) 768 msgr->global_seq = gt; 769 ret = ++msgr->global_seq; 770 spin_unlock(&msgr->global_seq_lock); 771 return ret; 772 } 773 774 static void con_out_kvec_reset(struct ceph_connection *con) 775 { 776 con->out_kvec_left = 0; 777 con->out_kvec_bytes = 0; 778 con->out_kvec_cur = &con->out_kvec[0]; 779 } 780 781 static void con_out_kvec_add(struct ceph_connection *con, 782 size_t size, void *data) 783 { 784 int index; 785 786 index = con->out_kvec_left; 787 BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); 788 789 con->out_kvec[index].iov_len = size; 790 con->out_kvec[index].iov_base = data; 791 con->out_kvec_left++; 792 con->out_kvec_bytes += size; 793 } 794 795 #ifdef CONFIG_BLOCK 796 797 /* 798 * For a bio data item, a piece is whatever remains of the next 799 * entry in the current bio iovec, or the first entry in the next 800 * bio in the list. 801 */ 802 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, 803 size_t length) 804 { 805 struct ceph_msg_data *data = cursor->data; 806 struct bio *bio; 807 808 BUG_ON(data->type != CEPH_MSG_DATA_BIO); 809 810 bio = data->bio; 811 BUG_ON(!bio); 812 813 cursor->resid = min(length, data->bio_length); 814 cursor->bio = bio; 815 cursor->bvec_iter = bio->bi_iter; 816 cursor->last_piece = 817 cursor->resid <= bio_iter_len(bio, cursor->bvec_iter); 818 } 819 820 static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, 821 size_t *page_offset, 822 size_t *length) 823 { 824 struct ceph_msg_data *data = cursor->data; 825 struct bio *bio; 826 struct bio_vec bio_vec; 827 828 BUG_ON(data->type != CEPH_MSG_DATA_BIO); 829 830 bio = cursor->bio; 831 BUG_ON(!bio); 832 833 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); 834 835 *page_offset = (size_t) bio_vec.bv_offset; 836 BUG_ON(*page_offset >= PAGE_SIZE); 837 if (cursor->last_piece) /* pagelist offset is always 0 */ 838 *length = cursor->resid; 839 else 840 *length = (size_t) bio_vec.bv_len; 841 BUG_ON(*length > cursor->resid); 842 BUG_ON(*page_offset + *length > PAGE_SIZE); 843 844 return bio_vec.bv_page; 845 } 846 847 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, 848 size_t bytes) 849 { 850 struct bio *bio; 851 struct bio_vec bio_vec; 852 853 BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); 854 855 bio = cursor->bio; 856 BUG_ON(!bio); 857 858 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); 859 860 /* Advance the cursor offset */ 861 862 BUG_ON(cursor->resid < bytes); 863 cursor->resid -= bytes; 864 865 bio_advance_iter(bio, &cursor->bvec_iter, bytes); 866 867 if (bytes < bio_vec.bv_len) 868 return false; /* more bytes to process in this segment */ 869 870 /* Move on to the next segment, and possibly the next bio */ 871 872 if (!cursor->bvec_iter.bi_size) { 873 bio = bio->bi_next; 874 cursor->bio = bio; 875 if (bio) 876 cursor->bvec_iter = bio->bi_iter; 877 else 878 memset(&cursor->bvec_iter, 0, 879 sizeof(cursor->bvec_iter)); 880 } 881 882 if (!cursor->last_piece) { 883 BUG_ON(!cursor->resid); 884 BUG_ON(!bio); 885 /* A short read is OK, so use <= rather than == */ 886 if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter)) 887 cursor->last_piece = true; 888 } 889 890 return true; 891 } 892 #endif /* CONFIG_BLOCK */ 893 894 /* 895 * For a page array, a piece comes from the first page in the array 896 * that has not already been fully consumed. 897 */ 898 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, 899 size_t length) 900 { 901 struct ceph_msg_data *data = cursor->data; 902 int page_count; 903 904 BUG_ON(data->type != CEPH_MSG_DATA_PAGES); 905 906 BUG_ON(!data->pages); 907 BUG_ON(!data->length); 908 909 cursor->resid = min(length, data->length); 910 page_count = calc_pages_for(data->alignment, (u64)data->length); 911 cursor->page_offset = data->alignment & ~PAGE_MASK; 912 cursor->page_index = 0; 913 BUG_ON(page_count > (int)USHRT_MAX); 914 cursor->page_count = (unsigned short)page_count; 915 BUG_ON(length > SIZE_MAX - cursor->page_offset); 916 cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE; 917 } 918 919 static struct page * 920 ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, 921 size_t *page_offset, size_t *length) 922 { 923 struct ceph_msg_data *data = cursor->data; 924 925 BUG_ON(data->type != CEPH_MSG_DATA_PAGES); 926 927 BUG_ON(cursor->page_index >= cursor->page_count); 928 BUG_ON(cursor->page_offset >= PAGE_SIZE); 929 930 *page_offset = cursor->page_offset; 931 if (cursor->last_piece) 932 *length = cursor->resid; 933 else 934 *length = PAGE_SIZE - *page_offset; 935 936 return data->pages[cursor->page_index]; 937 } 938 939 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, 940 size_t bytes) 941 { 942 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); 943 944 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); 945 946 /* Advance the cursor page offset */ 947 948 cursor->resid -= bytes; 949 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; 950 if (!bytes || cursor->page_offset) 951 return false; /* more bytes to process in the current page */ 952 953 if (!cursor->resid) 954 return false; /* no more data */ 955 956 /* Move on to the next page; offset is already at 0 */ 957 958 BUG_ON(cursor->page_index >= cursor->page_count); 959 cursor->page_index++; 960 cursor->last_piece = cursor->resid <= PAGE_SIZE; 961 962 return true; 963 } 964 965 /* 966 * For a pagelist, a piece is whatever remains to be consumed in the 967 * first page in the list, or the front of the next page. 968 */ 969 static void 970 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, 971 size_t length) 972 { 973 struct ceph_msg_data *data = cursor->data; 974 struct ceph_pagelist *pagelist; 975 struct page *page; 976 977 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 978 979 pagelist = data->pagelist; 980 BUG_ON(!pagelist); 981 982 if (!length) 983 return; /* pagelist can be assigned but empty */ 984 985 BUG_ON(list_empty(&pagelist->head)); 986 page = list_first_entry(&pagelist->head, struct page, lru); 987 988 cursor->resid = min(length, pagelist->length); 989 cursor->page = page; 990 cursor->offset = 0; 991 cursor->last_piece = cursor->resid <= PAGE_SIZE; 992 } 993 994 static struct page * 995 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, 996 size_t *page_offset, size_t *length) 997 { 998 struct ceph_msg_data *data = cursor->data; 999 struct ceph_pagelist *pagelist; 1000 1001 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 1002 1003 pagelist = data->pagelist; 1004 BUG_ON(!pagelist); 1005 1006 BUG_ON(!cursor->page); 1007 BUG_ON(cursor->offset + cursor->resid != pagelist->length); 1008 1009 /* offset of first page in pagelist is always 0 */ 1010 *page_offset = cursor->offset & ~PAGE_MASK; 1011 if (cursor->last_piece) 1012 *length = cursor->resid; 1013 else 1014 *length = PAGE_SIZE - *page_offset; 1015 1016 return cursor->page; 1017 } 1018 1019 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, 1020 size_t bytes) 1021 { 1022 struct ceph_msg_data *data = cursor->data; 1023 struct ceph_pagelist *pagelist; 1024 1025 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 1026 1027 pagelist = data->pagelist; 1028 BUG_ON(!pagelist); 1029 1030 BUG_ON(cursor->offset + cursor->resid != pagelist->length); 1031 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); 1032 1033 /* Advance the cursor offset */ 1034 1035 cursor->resid -= bytes; 1036 cursor->offset += bytes; 1037 /* offset of first page in pagelist is always 0 */ 1038 if (!bytes || cursor->offset & ~PAGE_MASK) 1039 return false; /* more bytes to process in the current page */ 1040 1041 if (!cursor->resid) 1042 return false; /* no more data */ 1043 1044 /* Move on to the next page */ 1045 1046 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); 1047 cursor->page = list_entry_next(cursor->page, lru); 1048 cursor->last_piece = cursor->resid <= PAGE_SIZE; 1049 1050 return true; 1051 } 1052 1053 /* 1054 * Message data is handled (sent or received) in pieces, where each 1055 * piece resides on a single page. The network layer might not 1056 * consume an entire piece at once. A data item's cursor keeps 1057 * track of which piece is next to process and how much remains to 1058 * be processed in that piece. It also tracks whether the current 1059 * piece is the last one in the data item. 1060 */ 1061 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) 1062 { 1063 size_t length = cursor->total_resid; 1064 1065 switch (cursor->data->type) { 1066 case CEPH_MSG_DATA_PAGELIST: 1067 ceph_msg_data_pagelist_cursor_init(cursor, length); 1068 break; 1069 case CEPH_MSG_DATA_PAGES: 1070 ceph_msg_data_pages_cursor_init(cursor, length); 1071 break; 1072 #ifdef CONFIG_BLOCK 1073 case CEPH_MSG_DATA_BIO: 1074 ceph_msg_data_bio_cursor_init(cursor, length); 1075 break; 1076 #endif /* CONFIG_BLOCK */ 1077 case CEPH_MSG_DATA_NONE: 1078 default: 1079 /* BUG(); */ 1080 break; 1081 } 1082 cursor->need_crc = true; 1083 } 1084 1085 static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length) 1086 { 1087 struct ceph_msg_data_cursor *cursor = &msg->cursor; 1088 struct ceph_msg_data *data; 1089 1090 BUG_ON(!length); 1091 BUG_ON(length > msg->data_length); 1092 BUG_ON(list_empty(&msg->data)); 1093 1094 cursor->data_head = &msg->data; 1095 cursor->total_resid = length; 1096 data = list_first_entry(&msg->data, struct ceph_msg_data, links); 1097 cursor->data = data; 1098 1099 __ceph_msg_data_cursor_init(cursor); 1100 } 1101 1102 /* 1103 * Return the page containing the next piece to process for a given 1104 * data item, and supply the page offset and length of that piece. 1105 * Indicate whether this is the last piece in this data item. 1106 */ 1107 static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, 1108 size_t *page_offset, size_t *length, 1109 bool *last_piece) 1110 { 1111 struct page *page; 1112 1113 switch (cursor->data->type) { 1114 case CEPH_MSG_DATA_PAGELIST: 1115 page = ceph_msg_data_pagelist_next(cursor, page_offset, length); 1116 break; 1117 case CEPH_MSG_DATA_PAGES: 1118 page = ceph_msg_data_pages_next(cursor, page_offset, length); 1119 break; 1120 #ifdef CONFIG_BLOCK 1121 case CEPH_MSG_DATA_BIO: 1122 page = ceph_msg_data_bio_next(cursor, page_offset, length); 1123 break; 1124 #endif /* CONFIG_BLOCK */ 1125 case CEPH_MSG_DATA_NONE: 1126 default: 1127 page = NULL; 1128 break; 1129 } 1130 BUG_ON(!page); 1131 BUG_ON(*page_offset + *length > PAGE_SIZE); 1132 BUG_ON(!*length); 1133 if (last_piece) 1134 *last_piece = cursor->last_piece; 1135 1136 return page; 1137 } 1138 1139 /* 1140 * Returns true if the result moves the cursor on to the next piece 1141 * of the data item. 1142 */ 1143 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, 1144 size_t bytes) 1145 { 1146 bool new_piece; 1147 1148 BUG_ON(bytes > cursor->resid); 1149 switch (cursor->data->type) { 1150 case CEPH_MSG_DATA_PAGELIST: 1151 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); 1152 break; 1153 case CEPH_MSG_DATA_PAGES: 1154 new_piece = ceph_msg_data_pages_advance(cursor, bytes); 1155 break; 1156 #ifdef CONFIG_BLOCK 1157 case CEPH_MSG_DATA_BIO: 1158 new_piece = ceph_msg_data_bio_advance(cursor, bytes); 1159 break; 1160 #endif /* CONFIG_BLOCK */ 1161 case CEPH_MSG_DATA_NONE: 1162 default: 1163 BUG(); 1164 break; 1165 } 1166 cursor->total_resid -= bytes; 1167 1168 if (!cursor->resid && cursor->total_resid) { 1169 WARN_ON(!cursor->last_piece); 1170 BUG_ON(list_is_last(&cursor->data->links, cursor->data_head)); 1171 cursor->data = list_entry_next(cursor->data, links); 1172 __ceph_msg_data_cursor_init(cursor); 1173 new_piece = true; 1174 } 1175 cursor->need_crc = new_piece; 1176 1177 return new_piece; 1178 } 1179 1180 static void prepare_message_data(struct ceph_msg *msg, u32 data_len) 1181 { 1182 BUG_ON(!msg); 1183 BUG_ON(!data_len); 1184 1185 /* Initialize data cursor */ 1186 1187 ceph_msg_data_cursor_init(msg, (size_t)data_len); 1188 } 1189 1190 /* 1191 * Prepare footer for currently outgoing message, and finish things 1192 * off. Assumes out_kvec* are already valid.. we just add on to the end. 1193 */ 1194 static void prepare_write_message_footer(struct ceph_connection *con) 1195 { 1196 struct ceph_msg *m = con->out_msg; 1197 int v = con->out_kvec_left; 1198 1199 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; 1200 1201 dout("prepare_write_message_footer %p\n", con); 1202 con->out_kvec_is_msg = true; 1203 con->out_kvec[v].iov_base = &m->footer; 1204 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) { 1205 if (con->ops->sign_message) 1206 con->ops->sign_message(con, m); 1207 else 1208 m->footer.sig = 0; 1209 con->out_kvec[v].iov_len = sizeof(m->footer); 1210 con->out_kvec_bytes += sizeof(m->footer); 1211 } else { 1212 m->old_footer.flags = m->footer.flags; 1213 con->out_kvec[v].iov_len = sizeof(m->old_footer); 1214 con->out_kvec_bytes += sizeof(m->old_footer); 1215 } 1216 con->out_kvec_left++; 1217 con->out_more = m->more_to_follow; 1218 con->out_msg_done = true; 1219 } 1220 1221 /* 1222 * Prepare headers for the next outgoing message. 1223 */ 1224 static void prepare_write_message(struct ceph_connection *con) 1225 { 1226 struct ceph_msg *m; 1227 u32 crc; 1228 1229 con_out_kvec_reset(con); 1230 con->out_kvec_is_msg = true; 1231 con->out_msg_done = false; 1232 1233 /* Sneak an ack in there first? If we can get it into the same 1234 * TCP packet that's a good thing. */ 1235 if (con->in_seq > con->in_seq_acked) { 1236 con->in_seq_acked = con->in_seq; 1237 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); 1238 con->out_temp_ack = cpu_to_le64(con->in_seq_acked); 1239 con_out_kvec_add(con, sizeof (con->out_temp_ack), 1240 &con->out_temp_ack); 1241 } 1242 1243 BUG_ON(list_empty(&con->out_queue)); 1244 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); 1245 con->out_msg = m; 1246 BUG_ON(m->con != con); 1247 1248 /* put message on sent list */ 1249 ceph_msg_get(m); 1250 list_move_tail(&m->list_head, &con->out_sent); 1251 1252 /* 1253 * only assign outgoing seq # if we haven't sent this message 1254 * yet. if it is requeued, resend with it's original seq. 1255 */ 1256 if (m->needs_out_seq) { 1257 m->hdr.seq = cpu_to_le64(++con->out_seq); 1258 m->needs_out_seq = false; 1259 } 1260 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); 1261 1262 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", 1263 m, con->out_seq, le16_to_cpu(m->hdr.type), 1264 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), 1265 m->data_length); 1266 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); 1267 1268 /* tag + hdr + front + middle */ 1269 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); 1270 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); 1271 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); 1272 1273 if (m->middle) 1274 con_out_kvec_add(con, m->middle->vec.iov_len, 1275 m->middle->vec.iov_base); 1276 1277 /* fill in crc (except data pages), footer */ 1278 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); 1279 con->out_msg->hdr.crc = cpu_to_le32(crc); 1280 con->out_msg->footer.flags = 0; 1281 1282 crc = crc32c(0, m->front.iov_base, m->front.iov_len); 1283 con->out_msg->footer.front_crc = cpu_to_le32(crc); 1284 if (m->middle) { 1285 crc = crc32c(0, m->middle->vec.iov_base, 1286 m->middle->vec.iov_len); 1287 con->out_msg->footer.middle_crc = cpu_to_le32(crc); 1288 } else 1289 con->out_msg->footer.middle_crc = 0; 1290 dout("%s front_crc %u middle_crc %u\n", __func__, 1291 le32_to_cpu(con->out_msg->footer.front_crc), 1292 le32_to_cpu(con->out_msg->footer.middle_crc)); 1293 1294 /* is there a data payload? */ 1295 con->out_msg->footer.data_crc = 0; 1296 if (m->data_length) { 1297 prepare_message_data(con->out_msg, m->data_length); 1298 con->out_more = 1; /* data + footer will follow */ 1299 } else { 1300 /* no, queue up footer too and be done */ 1301 prepare_write_message_footer(con); 1302 } 1303 1304 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1305 } 1306 1307 /* 1308 * Prepare an ack. 1309 */ 1310 static void prepare_write_ack(struct ceph_connection *con) 1311 { 1312 dout("prepare_write_ack %p %llu -> %llu\n", con, 1313 con->in_seq_acked, con->in_seq); 1314 con->in_seq_acked = con->in_seq; 1315 1316 con_out_kvec_reset(con); 1317 1318 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); 1319 1320 con->out_temp_ack = cpu_to_le64(con->in_seq_acked); 1321 con_out_kvec_add(con, sizeof (con->out_temp_ack), 1322 &con->out_temp_ack); 1323 1324 con->out_more = 1; /* more will follow.. eventually.. */ 1325 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1326 } 1327 1328 /* 1329 * Prepare to share the seq during handshake 1330 */ 1331 static void prepare_write_seq(struct ceph_connection *con) 1332 { 1333 dout("prepare_write_seq %p %llu -> %llu\n", con, 1334 con->in_seq_acked, con->in_seq); 1335 con->in_seq_acked = con->in_seq; 1336 1337 con_out_kvec_reset(con); 1338 1339 con->out_temp_ack = cpu_to_le64(con->in_seq_acked); 1340 con_out_kvec_add(con, sizeof (con->out_temp_ack), 1341 &con->out_temp_ack); 1342 1343 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1344 } 1345 1346 /* 1347 * Prepare to write keepalive byte. 1348 */ 1349 static void prepare_write_keepalive(struct ceph_connection *con) 1350 { 1351 dout("prepare_write_keepalive %p\n", con); 1352 con_out_kvec_reset(con); 1353 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); 1354 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1355 } 1356 1357 /* 1358 * Connection negotiation. 1359 */ 1360 1361 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, 1362 int *auth_proto) 1363 { 1364 struct ceph_auth_handshake *auth; 1365 1366 if (!con->ops->get_authorizer) { 1367 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; 1368 con->out_connect.authorizer_len = 0; 1369 return NULL; 1370 } 1371 1372 /* Can't hold the mutex while getting authorizer */ 1373 mutex_unlock(&con->mutex); 1374 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); 1375 mutex_lock(&con->mutex); 1376 1377 if (IS_ERR(auth)) 1378 return auth; 1379 if (con->state != CON_STATE_NEGOTIATING) 1380 return ERR_PTR(-EAGAIN); 1381 1382 con->auth_reply_buf = auth->authorizer_reply_buf; 1383 con->auth_reply_buf_len = auth->authorizer_reply_buf_len; 1384 return auth; 1385 } 1386 1387 /* 1388 * We connected to a peer and are saying hello. 1389 */ 1390 static void prepare_write_banner(struct ceph_connection *con) 1391 { 1392 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); 1393 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), 1394 &con->msgr->my_enc_addr); 1395 1396 con->out_more = 0; 1397 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1398 } 1399 1400 static int prepare_write_connect(struct ceph_connection *con) 1401 { 1402 unsigned int global_seq = get_global_seq(con->msgr, 0); 1403 int proto; 1404 int auth_proto; 1405 struct ceph_auth_handshake *auth; 1406 1407 switch (con->peer_name.type) { 1408 case CEPH_ENTITY_TYPE_MON: 1409 proto = CEPH_MONC_PROTOCOL; 1410 break; 1411 case CEPH_ENTITY_TYPE_OSD: 1412 proto = CEPH_OSDC_PROTOCOL; 1413 break; 1414 case CEPH_ENTITY_TYPE_MDS: 1415 proto = CEPH_MDSC_PROTOCOL; 1416 break; 1417 default: 1418 BUG(); 1419 } 1420 1421 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, 1422 con->connect_seq, global_seq, proto); 1423 1424 con->out_connect.features = cpu_to_le64(con->msgr->supported_features); 1425 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); 1426 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); 1427 con->out_connect.global_seq = cpu_to_le32(global_seq); 1428 con->out_connect.protocol_version = cpu_to_le32(proto); 1429 con->out_connect.flags = 0; 1430 1431 auth_proto = CEPH_AUTH_UNKNOWN; 1432 auth = get_connect_authorizer(con, &auth_proto); 1433 if (IS_ERR(auth)) 1434 return PTR_ERR(auth); 1435 1436 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); 1437 con->out_connect.authorizer_len = auth ? 1438 cpu_to_le32(auth->authorizer_buf_len) : 0; 1439 1440 con_out_kvec_add(con, sizeof (con->out_connect), 1441 &con->out_connect); 1442 if (auth && auth->authorizer_buf_len) 1443 con_out_kvec_add(con, auth->authorizer_buf_len, 1444 auth->authorizer_buf); 1445 1446 con->out_more = 0; 1447 con_flag_set(con, CON_FLAG_WRITE_PENDING); 1448 1449 return 0; 1450 } 1451 1452 /* 1453 * write as much of pending kvecs to the socket as we can. 1454 * 1 -> done 1455 * 0 -> socket full, but more to do 1456 * <0 -> error 1457 */ 1458 static int write_partial_kvec(struct ceph_connection *con) 1459 { 1460 int ret; 1461 1462 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); 1463 while (con->out_kvec_bytes > 0) { 1464 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, 1465 con->out_kvec_left, con->out_kvec_bytes, 1466 con->out_more); 1467 if (ret <= 0) 1468 goto out; 1469 con->out_kvec_bytes -= ret; 1470 if (con->out_kvec_bytes == 0) 1471 break; /* done */ 1472 1473 /* account for full iov entries consumed */ 1474 while (ret >= con->out_kvec_cur->iov_len) { 1475 BUG_ON(!con->out_kvec_left); 1476 ret -= con->out_kvec_cur->iov_len; 1477 con->out_kvec_cur++; 1478 con->out_kvec_left--; 1479 } 1480 /* and for a partially-consumed entry */ 1481 if (ret) { 1482 con->out_kvec_cur->iov_len -= ret; 1483 con->out_kvec_cur->iov_base += ret; 1484 } 1485 } 1486 con->out_kvec_left = 0; 1487 con->out_kvec_is_msg = false; 1488 ret = 1; 1489 out: 1490 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, 1491 con->out_kvec_bytes, con->out_kvec_left, ret); 1492 return ret; /* done! */ 1493 } 1494 1495 static u32 ceph_crc32c_page(u32 crc, struct page *page, 1496 unsigned int page_offset, 1497 unsigned int length) 1498 { 1499 char *kaddr; 1500 1501 kaddr = kmap(page); 1502 BUG_ON(kaddr == NULL); 1503 crc = crc32c(crc, kaddr + page_offset, length); 1504 kunmap(page); 1505 1506 return crc; 1507 } 1508 /* 1509 * Write as much message data payload as we can. If we finish, queue 1510 * up the footer. 1511 * 1 -> done, footer is now queued in out_kvec[]. 1512 * 0 -> socket full, but more to do 1513 * <0 -> error 1514 */ 1515 static int write_partial_message_data(struct ceph_connection *con) 1516 { 1517 struct ceph_msg *msg = con->out_msg; 1518 struct ceph_msg_data_cursor *cursor = &msg->cursor; 1519 bool do_datacrc = !con->msgr->nocrc; 1520 u32 crc; 1521 1522 dout("%s %p msg %p\n", __func__, con, msg); 1523 1524 if (list_empty(&msg->data)) 1525 return -EINVAL; 1526 1527 /* 1528 * Iterate through each page that contains data to be 1529 * written, and send as much as possible for each. 1530 * 1531 * If we are calculating the data crc (the default), we will 1532 * need to map the page. If we have no pages, they have 1533 * been revoked, so use the zero page. 1534 */ 1535 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; 1536 while (cursor->resid) { 1537 struct page *page; 1538 size_t page_offset; 1539 size_t length; 1540 bool last_piece; 1541 bool need_crc; 1542 int ret; 1543 1544 page = ceph_msg_data_next(&msg->cursor, &page_offset, &length, 1545 &last_piece); 1546 ret = ceph_tcp_sendpage(con->sock, page, page_offset, 1547 length, !last_piece); 1548 if (ret <= 0) { 1549 if (do_datacrc) 1550 msg->footer.data_crc = cpu_to_le32(crc); 1551 1552 return ret; 1553 } 1554 if (do_datacrc && cursor->need_crc) 1555 crc = ceph_crc32c_page(crc, page, page_offset, length); 1556 need_crc = ceph_msg_data_advance(&msg->cursor, (size_t)ret); 1557 } 1558 1559 dout("%s %p msg %p done\n", __func__, con, msg); 1560 1561 /* prepare and queue up footer, too */ 1562 if (do_datacrc) 1563 msg->footer.data_crc = cpu_to_le32(crc); 1564 else 1565 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; 1566 con_out_kvec_reset(con); 1567 prepare_write_message_footer(con); 1568 1569 return 1; /* must return > 0 to indicate success */ 1570 } 1571 1572 /* 1573 * write some zeros 1574 */ 1575 static int write_partial_skip(struct ceph_connection *con) 1576 { 1577 int ret; 1578 1579 while (con->out_skip > 0) { 1580 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); 1581 1582 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); 1583 if (ret <= 0) 1584 goto out; 1585 con->out_skip -= ret; 1586 } 1587 ret = 1; 1588 out: 1589 return ret; 1590 } 1591 1592 /* 1593 * Prepare to read connection handshake, or an ack. 1594 */ 1595 static void prepare_read_banner(struct ceph_connection *con) 1596 { 1597 dout("prepare_read_banner %p\n", con); 1598 con->in_base_pos = 0; 1599 } 1600 1601 static void prepare_read_connect(struct ceph_connection *con) 1602 { 1603 dout("prepare_read_connect %p\n", con); 1604 con->in_base_pos = 0; 1605 } 1606 1607 static void prepare_read_ack(struct ceph_connection *con) 1608 { 1609 dout("prepare_read_ack %p\n", con); 1610 con->in_base_pos = 0; 1611 } 1612 1613 static void prepare_read_seq(struct ceph_connection *con) 1614 { 1615 dout("prepare_read_seq %p\n", con); 1616 con->in_base_pos = 0; 1617 con->in_tag = CEPH_MSGR_TAG_SEQ; 1618 } 1619 1620 static void prepare_read_tag(struct ceph_connection *con) 1621 { 1622 dout("prepare_read_tag %p\n", con); 1623 con->in_base_pos = 0; 1624 con->in_tag = CEPH_MSGR_TAG_READY; 1625 } 1626 1627 /* 1628 * Prepare to read a message. 1629 */ 1630 static int prepare_read_message(struct ceph_connection *con) 1631 { 1632 dout("prepare_read_message %p\n", con); 1633 BUG_ON(con->in_msg != NULL); 1634 con->in_base_pos = 0; 1635 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; 1636 return 0; 1637 } 1638 1639 1640 static int read_partial(struct ceph_connection *con, 1641 int end, int size, void *object) 1642 { 1643 while (con->in_base_pos < end) { 1644 int left = end - con->in_base_pos; 1645 int have = size - left; 1646 int ret = ceph_tcp_recvmsg(con->sock, object + have, left); 1647 if (ret <= 0) 1648 return ret; 1649 con->in_base_pos += ret; 1650 } 1651 return 1; 1652 } 1653 1654 1655 /* 1656 * Read all or part of the connect-side handshake on a new connection 1657 */ 1658 static int read_partial_banner(struct ceph_connection *con) 1659 { 1660 int size; 1661 int end; 1662 int ret; 1663 1664 dout("read_partial_banner %p at %d\n", con, con->in_base_pos); 1665 1666 /* peer's banner */ 1667 size = strlen(CEPH_BANNER); 1668 end = size; 1669 ret = read_partial(con, end, size, con->in_banner); 1670 if (ret <= 0) 1671 goto out; 1672 1673 size = sizeof (con->actual_peer_addr); 1674 end += size; 1675 ret = read_partial(con, end, size, &con->actual_peer_addr); 1676 if (ret <= 0) 1677 goto out; 1678 1679 size = sizeof (con->peer_addr_for_me); 1680 end += size; 1681 ret = read_partial(con, end, size, &con->peer_addr_for_me); 1682 if (ret <= 0) 1683 goto out; 1684 1685 out: 1686 return ret; 1687 } 1688 1689 static int read_partial_connect(struct ceph_connection *con) 1690 { 1691 int size; 1692 int end; 1693 int ret; 1694 1695 dout("read_partial_connect %p at %d\n", con, con->in_base_pos); 1696 1697 size = sizeof (con->in_reply); 1698 end = size; 1699 ret = read_partial(con, end, size, &con->in_reply); 1700 if (ret <= 0) 1701 goto out; 1702 1703 size = le32_to_cpu(con->in_reply.authorizer_len); 1704 end += size; 1705 ret = read_partial(con, end, size, con->auth_reply_buf); 1706 if (ret <= 0) 1707 goto out; 1708 1709 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", 1710 con, (int)con->in_reply.tag, 1711 le32_to_cpu(con->in_reply.connect_seq), 1712 le32_to_cpu(con->in_reply.global_seq)); 1713 out: 1714 return ret; 1715 1716 } 1717 1718 /* 1719 * Verify the hello banner looks okay. 1720 */ 1721 static int verify_hello(struct ceph_connection *con) 1722 { 1723 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { 1724 pr_err("connect to %s got bad banner\n", 1725 ceph_pr_addr(&con->peer_addr.in_addr)); 1726 con->error_msg = "protocol error, bad banner"; 1727 return -1; 1728 } 1729 return 0; 1730 } 1731 1732 static bool addr_is_blank(struct sockaddr_storage *ss) 1733 { 1734 switch (ss->ss_family) { 1735 case AF_INET: 1736 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; 1737 case AF_INET6: 1738 return 1739 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && 1740 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && 1741 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && 1742 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; 1743 } 1744 return false; 1745 } 1746 1747 static int addr_port(struct sockaddr_storage *ss) 1748 { 1749 switch (ss->ss_family) { 1750 case AF_INET: 1751 return ntohs(((struct sockaddr_in *)ss)->sin_port); 1752 case AF_INET6: 1753 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); 1754 } 1755 return 0; 1756 } 1757 1758 static void addr_set_port(struct sockaddr_storage *ss, int p) 1759 { 1760 switch (ss->ss_family) { 1761 case AF_INET: 1762 ((struct sockaddr_in *)ss)->sin_port = htons(p); 1763 break; 1764 case AF_INET6: 1765 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); 1766 break; 1767 } 1768 } 1769 1770 /* 1771 * Unlike other *_pton function semantics, zero indicates success. 1772 */ 1773 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, 1774 char delim, const char **ipend) 1775 { 1776 struct sockaddr_in *in4 = (struct sockaddr_in *) ss; 1777 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; 1778 1779 memset(ss, 0, sizeof(*ss)); 1780 1781 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { 1782 ss->ss_family = AF_INET; 1783 return 0; 1784 } 1785 1786 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { 1787 ss->ss_family = AF_INET6; 1788 return 0; 1789 } 1790 1791 return -EINVAL; 1792 } 1793 1794 /* 1795 * Extract hostname string and resolve using kernel DNS facility. 1796 */ 1797 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER 1798 static int ceph_dns_resolve_name(const char *name, size_t namelen, 1799 struct sockaddr_storage *ss, char delim, const char **ipend) 1800 { 1801 const char *end, *delim_p; 1802 char *colon_p, *ip_addr = NULL; 1803 int ip_len, ret; 1804 1805 /* 1806 * The end of the hostname occurs immediately preceding the delimiter or 1807 * the port marker (':') where the delimiter takes precedence. 1808 */ 1809 delim_p = memchr(name, delim, namelen); 1810 colon_p = memchr(name, ':', namelen); 1811 1812 if (delim_p && colon_p) 1813 end = delim_p < colon_p ? delim_p : colon_p; 1814 else if (!delim_p && colon_p) 1815 end = colon_p; 1816 else { 1817 end = delim_p; 1818 if (!end) /* case: hostname:/ */ 1819 end = name + namelen; 1820 } 1821 1822 if (end <= name) 1823 return -EINVAL; 1824 1825 /* do dns_resolve upcall */ 1826 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); 1827 if (ip_len > 0) 1828 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); 1829 else 1830 ret = -ESRCH; 1831 1832 kfree(ip_addr); 1833 1834 *ipend = end; 1835 1836 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, 1837 ret, ret ? "failed" : ceph_pr_addr(ss)); 1838 1839 return ret; 1840 } 1841 #else 1842 static inline int ceph_dns_resolve_name(const char *name, size_t namelen, 1843 struct sockaddr_storage *ss, char delim, const char **ipend) 1844 { 1845 return -EINVAL; 1846 } 1847 #endif 1848 1849 /* 1850 * Parse a server name (IP or hostname). If a valid IP address is not found 1851 * then try to extract a hostname to resolve using userspace DNS upcall. 1852 */ 1853 static int ceph_parse_server_name(const char *name, size_t namelen, 1854 struct sockaddr_storage *ss, char delim, const char **ipend) 1855 { 1856 int ret; 1857 1858 ret = ceph_pton(name, namelen, ss, delim, ipend); 1859 if (ret) 1860 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); 1861 1862 return ret; 1863 } 1864 1865 /* 1866 * Parse an ip[:port] list into an addr array. Use the default 1867 * monitor port if a port isn't specified. 1868 */ 1869 int ceph_parse_ips(const char *c, const char *end, 1870 struct ceph_entity_addr *addr, 1871 int max_count, int *count) 1872 { 1873 int i, ret = -EINVAL; 1874 const char *p = c; 1875 1876 dout("parse_ips on '%.*s'\n", (int)(end-c), c); 1877 for (i = 0; i < max_count; i++) { 1878 const char *ipend; 1879 struct sockaddr_storage *ss = &addr[i].in_addr; 1880 int port; 1881 char delim = ','; 1882 1883 if (*p == '[') { 1884 delim = ']'; 1885 p++; 1886 } 1887 1888 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); 1889 if (ret) 1890 goto bad; 1891 ret = -EINVAL; 1892 1893 p = ipend; 1894 1895 if (delim == ']') { 1896 if (*p != ']') { 1897 dout("missing matching ']'\n"); 1898 goto bad; 1899 } 1900 p++; 1901 } 1902 1903 /* port? */ 1904 if (p < end && *p == ':') { 1905 port = 0; 1906 p++; 1907 while (p < end && *p >= '0' && *p <= '9') { 1908 port = (port * 10) + (*p - '0'); 1909 p++; 1910 } 1911 if (port == 0) 1912 port = CEPH_MON_PORT; 1913 else if (port > 65535) 1914 goto bad; 1915 } else { 1916 port = CEPH_MON_PORT; 1917 } 1918 1919 addr_set_port(ss, port); 1920 1921 dout("parse_ips got %s\n", ceph_pr_addr(ss)); 1922 1923 if (p == end) 1924 break; 1925 if (*p != ',') 1926 goto bad; 1927 p++; 1928 } 1929 1930 if (p != end) 1931 goto bad; 1932 1933 if (count) 1934 *count = i + 1; 1935 return 0; 1936 1937 bad: 1938 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); 1939 return ret; 1940 } 1941 EXPORT_SYMBOL(ceph_parse_ips); 1942 1943 static int process_banner(struct ceph_connection *con) 1944 { 1945 dout("process_banner on %p\n", con); 1946 1947 if (verify_hello(con) < 0) 1948 return -1; 1949 1950 ceph_decode_addr(&con->actual_peer_addr); 1951 ceph_decode_addr(&con->peer_addr_for_me); 1952 1953 /* 1954 * Make sure the other end is who we wanted. note that the other 1955 * end may not yet know their ip address, so if it's 0.0.0.0, give 1956 * them the benefit of the doubt. 1957 */ 1958 if (memcmp(&con->peer_addr, &con->actual_peer_addr, 1959 sizeof(con->peer_addr)) != 0 && 1960 !(addr_is_blank(&con->actual_peer_addr.in_addr) && 1961 con->actual_peer_addr.nonce == con->peer_addr.nonce)) { 1962 pr_warn("wrong peer, want %s/%d, got %s/%d\n", 1963 ceph_pr_addr(&con->peer_addr.in_addr), 1964 (int)le32_to_cpu(con->peer_addr.nonce), 1965 ceph_pr_addr(&con->actual_peer_addr.in_addr), 1966 (int)le32_to_cpu(con->actual_peer_addr.nonce)); 1967 con->error_msg = "wrong peer at address"; 1968 return -1; 1969 } 1970 1971 /* 1972 * did we learn our address? 1973 */ 1974 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { 1975 int port = addr_port(&con->msgr->inst.addr.in_addr); 1976 1977 memcpy(&con->msgr->inst.addr.in_addr, 1978 &con->peer_addr_for_me.in_addr, 1979 sizeof(con->peer_addr_for_me.in_addr)); 1980 addr_set_port(&con->msgr->inst.addr.in_addr, port); 1981 encode_my_addr(con->msgr); 1982 dout("process_banner learned my addr is %s\n", 1983 ceph_pr_addr(&con->msgr->inst.addr.in_addr)); 1984 } 1985 1986 return 0; 1987 } 1988 1989 static int process_connect(struct ceph_connection *con) 1990 { 1991 u64 sup_feat = con->msgr->supported_features; 1992 u64 req_feat = con->msgr->required_features; 1993 u64 server_feat = ceph_sanitize_features( 1994 le64_to_cpu(con->in_reply.features)); 1995 int ret; 1996 1997 dout("process_connect on %p tag %d\n", con, (int)con->in_tag); 1998 1999 switch (con->in_reply.tag) { 2000 case CEPH_MSGR_TAG_FEATURES: 2001 pr_err("%s%lld %s feature set mismatch," 2002 " my %llx < server's %llx, missing %llx\n", 2003 ENTITY_NAME(con->peer_name), 2004 ceph_pr_addr(&con->peer_addr.in_addr), 2005 sup_feat, server_feat, server_feat & ~sup_feat); 2006 con->error_msg = "missing required protocol features"; 2007 reset_connection(con); 2008 return -1; 2009 2010 case CEPH_MSGR_TAG_BADPROTOVER: 2011 pr_err("%s%lld %s protocol version mismatch," 2012 " my %d != server's %d\n", 2013 ENTITY_NAME(con->peer_name), 2014 ceph_pr_addr(&con->peer_addr.in_addr), 2015 le32_to_cpu(con->out_connect.protocol_version), 2016 le32_to_cpu(con->in_reply.protocol_version)); 2017 con->error_msg = "protocol version mismatch"; 2018 reset_connection(con); 2019 return -1; 2020 2021 case CEPH_MSGR_TAG_BADAUTHORIZER: 2022 con->auth_retry++; 2023 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, 2024 con->auth_retry); 2025 if (con->auth_retry == 2) { 2026 con->error_msg = "connect authorization failure"; 2027 return -1; 2028 } 2029 con_out_kvec_reset(con); 2030 ret = prepare_write_connect(con); 2031 if (ret < 0) 2032 return ret; 2033 prepare_read_connect(con); 2034 break; 2035 2036 case CEPH_MSGR_TAG_RESETSESSION: 2037 /* 2038 * If we connected with a large connect_seq but the peer 2039 * has no record of a session with us (no connection, or 2040 * connect_seq == 0), they will send RESETSESION to indicate 2041 * that they must have reset their session, and may have 2042 * dropped messages. 2043 */ 2044 dout("process_connect got RESET peer seq %u\n", 2045 le32_to_cpu(con->in_reply.connect_seq)); 2046 pr_err("%s%lld %s connection reset\n", 2047 ENTITY_NAME(con->peer_name), 2048 ceph_pr_addr(&con->peer_addr.in_addr)); 2049 reset_connection(con); 2050 con_out_kvec_reset(con); 2051 ret = prepare_write_connect(con); 2052 if (ret < 0) 2053 return ret; 2054 prepare_read_connect(con); 2055 2056 /* Tell ceph about it. */ 2057 mutex_unlock(&con->mutex); 2058 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); 2059 if (con->ops->peer_reset) 2060 con->ops->peer_reset(con); 2061 mutex_lock(&con->mutex); 2062 if (con->state != CON_STATE_NEGOTIATING) 2063 return -EAGAIN; 2064 break; 2065 2066 case CEPH_MSGR_TAG_RETRY_SESSION: 2067 /* 2068 * If we sent a smaller connect_seq than the peer has, try 2069 * again with a larger value. 2070 */ 2071 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", 2072 le32_to_cpu(con->out_connect.connect_seq), 2073 le32_to_cpu(con->in_reply.connect_seq)); 2074 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); 2075 con_out_kvec_reset(con); 2076 ret = prepare_write_connect(con); 2077 if (ret < 0) 2078 return ret; 2079 prepare_read_connect(con); 2080 break; 2081 2082 case CEPH_MSGR_TAG_RETRY_GLOBAL: 2083 /* 2084 * If we sent a smaller global_seq than the peer has, try 2085 * again with a larger value. 2086 */ 2087 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", 2088 con->peer_global_seq, 2089 le32_to_cpu(con->in_reply.global_seq)); 2090 get_global_seq(con->msgr, 2091 le32_to_cpu(con->in_reply.global_seq)); 2092 con_out_kvec_reset(con); 2093 ret = prepare_write_connect(con); 2094 if (ret < 0) 2095 return ret; 2096 prepare_read_connect(con); 2097 break; 2098 2099 case CEPH_MSGR_TAG_SEQ: 2100 case CEPH_MSGR_TAG_READY: 2101 if (req_feat & ~server_feat) { 2102 pr_err("%s%lld %s protocol feature mismatch," 2103 " my required %llx > server's %llx, need %llx\n", 2104 ENTITY_NAME(con->peer_name), 2105 ceph_pr_addr(&con->peer_addr.in_addr), 2106 req_feat, server_feat, req_feat & ~server_feat); 2107 con->error_msg = "missing required protocol features"; 2108 reset_connection(con); 2109 return -1; 2110 } 2111 2112 WARN_ON(con->state != CON_STATE_NEGOTIATING); 2113 con->state = CON_STATE_OPEN; 2114 con->auth_retry = 0; /* we authenticated; clear flag */ 2115 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); 2116 con->connect_seq++; 2117 con->peer_features = server_feat; 2118 dout("process_connect got READY gseq %d cseq %d (%d)\n", 2119 con->peer_global_seq, 2120 le32_to_cpu(con->in_reply.connect_seq), 2121 con->connect_seq); 2122 WARN_ON(con->connect_seq != 2123 le32_to_cpu(con->in_reply.connect_seq)); 2124 2125 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) 2126 con_flag_set(con, CON_FLAG_LOSSYTX); 2127 2128 con->delay = 0; /* reset backoff memory */ 2129 2130 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { 2131 prepare_write_seq(con); 2132 prepare_read_seq(con); 2133 } else { 2134 prepare_read_tag(con); 2135 } 2136 break; 2137 2138 case CEPH_MSGR_TAG_WAIT: 2139 /* 2140 * If there is a connection race (we are opening 2141 * connections to each other), one of us may just have 2142 * to WAIT. This shouldn't happen if we are the 2143 * client. 2144 */ 2145 con->error_msg = "protocol error, got WAIT as client"; 2146 return -1; 2147 2148 default: 2149 con->error_msg = "protocol error, garbage tag during connect"; 2150 return -1; 2151 } 2152 return 0; 2153 } 2154 2155 2156 /* 2157 * read (part of) an ack 2158 */ 2159 static int read_partial_ack(struct ceph_connection *con) 2160 { 2161 int size = sizeof (con->in_temp_ack); 2162 int end = size; 2163 2164 return read_partial(con, end, size, &con->in_temp_ack); 2165 } 2166 2167 /* 2168 * We can finally discard anything that's been acked. 2169 */ 2170 static void process_ack(struct ceph_connection *con) 2171 { 2172 struct ceph_msg *m; 2173 u64 ack = le64_to_cpu(con->in_temp_ack); 2174 u64 seq; 2175 2176 while (!list_empty(&con->out_sent)) { 2177 m = list_first_entry(&con->out_sent, struct ceph_msg, 2178 list_head); 2179 seq = le64_to_cpu(m->hdr.seq); 2180 if (seq > ack) 2181 break; 2182 dout("got ack for seq %llu type %d at %p\n", seq, 2183 le16_to_cpu(m->hdr.type), m); 2184 m->ack_stamp = jiffies; 2185 ceph_msg_remove(m); 2186 } 2187 prepare_read_tag(con); 2188 } 2189 2190 2191 static int read_partial_message_section(struct ceph_connection *con, 2192 struct kvec *section, 2193 unsigned int sec_len, u32 *crc) 2194 { 2195 int ret, left; 2196 2197 BUG_ON(!section); 2198 2199 while (section->iov_len < sec_len) { 2200 BUG_ON(section->iov_base == NULL); 2201 left = sec_len - section->iov_len; 2202 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + 2203 section->iov_len, left); 2204 if (ret <= 0) 2205 return ret; 2206 section->iov_len += ret; 2207 } 2208 if (section->iov_len == sec_len) 2209 *crc = crc32c(0, section->iov_base, section->iov_len); 2210 2211 return 1; 2212 } 2213 2214 static int read_partial_msg_data(struct ceph_connection *con) 2215 { 2216 struct ceph_msg *msg = con->in_msg; 2217 struct ceph_msg_data_cursor *cursor = &msg->cursor; 2218 const bool do_datacrc = !con->msgr->nocrc; 2219 struct page *page; 2220 size_t page_offset; 2221 size_t length; 2222 u32 crc = 0; 2223 int ret; 2224 2225 BUG_ON(!msg); 2226 if (list_empty(&msg->data)) 2227 return -EIO; 2228 2229 if (do_datacrc) 2230 crc = con->in_data_crc; 2231 while (cursor->resid) { 2232 page = ceph_msg_data_next(&msg->cursor, &page_offset, &length, 2233 NULL); 2234 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); 2235 if (ret <= 0) { 2236 if (do_datacrc) 2237 con->in_data_crc = crc; 2238 2239 return ret; 2240 } 2241 2242 if (do_datacrc) 2243 crc = ceph_crc32c_page(crc, page, page_offset, ret); 2244 (void) ceph_msg_data_advance(&msg->cursor, (size_t)ret); 2245 } 2246 if (do_datacrc) 2247 con->in_data_crc = crc; 2248 2249 return 1; /* must return > 0 to indicate success */ 2250 } 2251 2252 /* 2253 * read (part of) a message. 2254 */ 2255 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); 2256 2257 static int read_partial_message(struct ceph_connection *con) 2258 { 2259 struct ceph_msg *m = con->in_msg; 2260 int size; 2261 int end; 2262 int ret; 2263 unsigned int front_len, middle_len, data_len; 2264 bool do_datacrc = !con->msgr->nocrc; 2265 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH); 2266 u64 seq; 2267 u32 crc; 2268 2269 dout("read_partial_message con %p msg %p\n", con, m); 2270 2271 /* header */ 2272 size = sizeof (con->in_hdr); 2273 end = size; 2274 ret = read_partial(con, end, size, &con->in_hdr); 2275 if (ret <= 0) 2276 return ret; 2277 2278 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); 2279 if (cpu_to_le32(crc) != con->in_hdr.crc) { 2280 pr_err("read_partial_message bad hdr crc %u != expected %u\n", 2281 crc, con->in_hdr.crc); 2282 return -EBADMSG; 2283 } 2284 2285 front_len = le32_to_cpu(con->in_hdr.front_len); 2286 if (front_len > CEPH_MSG_MAX_FRONT_LEN) 2287 return -EIO; 2288 middle_len = le32_to_cpu(con->in_hdr.middle_len); 2289 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) 2290 return -EIO; 2291 data_len = le32_to_cpu(con->in_hdr.data_len); 2292 if (data_len > CEPH_MSG_MAX_DATA_LEN) 2293 return -EIO; 2294 2295 /* verify seq# */ 2296 seq = le64_to_cpu(con->in_hdr.seq); 2297 if ((s64)seq - (s64)con->in_seq < 1) { 2298 pr_info("skipping %s%lld %s seq %lld expected %lld\n", 2299 ENTITY_NAME(con->peer_name), 2300 ceph_pr_addr(&con->peer_addr.in_addr), 2301 seq, con->in_seq + 1); 2302 con->in_base_pos = -front_len - middle_len - data_len - 2303 sizeof(m->footer); 2304 con->in_tag = CEPH_MSGR_TAG_READY; 2305 return 0; 2306 } else if ((s64)seq - (s64)con->in_seq > 1) { 2307 pr_err("read_partial_message bad seq %lld expected %lld\n", 2308 seq, con->in_seq + 1); 2309 con->error_msg = "bad message sequence # for incoming message"; 2310 return -EBADE; 2311 } 2312 2313 /* allocate message? */ 2314 if (!con->in_msg) { 2315 int skip = 0; 2316 2317 dout("got hdr type %d front %d data %d\n", con->in_hdr.type, 2318 front_len, data_len); 2319 ret = ceph_con_in_msg_alloc(con, &skip); 2320 if (ret < 0) 2321 return ret; 2322 2323 BUG_ON(!con->in_msg ^ skip); 2324 if (con->in_msg && data_len > con->in_msg->data_length) { 2325 pr_warn("%s skipping long message (%u > %zd)\n", 2326 __func__, data_len, con->in_msg->data_length); 2327 ceph_msg_put(con->in_msg); 2328 con->in_msg = NULL; 2329 skip = 1; 2330 } 2331 if (skip) { 2332 /* skip this message */ 2333 dout("alloc_msg said skip message\n"); 2334 con->in_base_pos = -front_len - middle_len - data_len - 2335 sizeof(m->footer); 2336 con->in_tag = CEPH_MSGR_TAG_READY; 2337 con->in_seq++; 2338 return 0; 2339 } 2340 2341 BUG_ON(!con->in_msg); 2342 BUG_ON(con->in_msg->con != con); 2343 m = con->in_msg; 2344 m->front.iov_len = 0; /* haven't read it yet */ 2345 if (m->middle) 2346 m->middle->vec.iov_len = 0; 2347 2348 /* prepare for data payload, if any */ 2349 2350 if (data_len) 2351 prepare_message_data(con->in_msg, data_len); 2352 } 2353 2354 /* front */ 2355 ret = read_partial_message_section(con, &m->front, front_len, 2356 &con->in_front_crc); 2357 if (ret <= 0) 2358 return ret; 2359 2360 /* middle */ 2361 if (m->middle) { 2362 ret = read_partial_message_section(con, &m->middle->vec, 2363 middle_len, 2364 &con->in_middle_crc); 2365 if (ret <= 0) 2366 return ret; 2367 } 2368 2369 /* (page) data */ 2370 if (data_len) { 2371 ret = read_partial_msg_data(con); 2372 if (ret <= 0) 2373 return ret; 2374 } 2375 2376 /* footer */ 2377 if (need_sign) 2378 size = sizeof(m->footer); 2379 else 2380 size = sizeof(m->old_footer); 2381 2382 end += size; 2383 ret = read_partial(con, end, size, &m->footer); 2384 if (ret <= 0) 2385 return ret; 2386 2387 if (!need_sign) { 2388 m->footer.flags = m->old_footer.flags; 2389 m->footer.sig = 0; 2390 } 2391 2392 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", 2393 m, front_len, m->footer.front_crc, middle_len, 2394 m->footer.middle_crc, data_len, m->footer.data_crc); 2395 2396 /* crc ok? */ 2397 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { 2398 pr_err("read_partial_message %p front crc %u != exp. %u\n", 2399 m, con->in_front_crc, m->footer.front_crc); 2400 return -EBADMSG; 2401 } 2402 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { 2403 pr_err("read_partial_message %p middle crc %u != exp %u\n", 2404 m, con->in_middle_crc, m->footer.middle_crc); 2405 return -EBADMSG; 2406 } 2407 if (do_datacrc && 2408 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && 2409 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { 2410 pr_err("read_partial_message %p data crc %u != exp. %u\n", m, 2411 con->in_data_crc, le32_to_cpu(m->footer.data_crc)); 2412 return -EBADMSG; 2413 } 2414 2415 if (need_sign && con->ops->check_message_signature && 2416 con->ops->check_message_signature(con, m)) { 2417 pr_err("read_partial_message %p signature check failed\n", m); 2418 return -EBADMSG; 2419 } 2420 2421 return 1; /* done! */ 2422 } 2423 2424 /* 2425 * Process message. This happens in the worker thread. The callback should 2426 * be careful not to do anything that waits on other incoming messages or it 2427 * may deadlock. 2428 */ 2429 static void process_message(struct ceph_connection *con) 2430 { 2431 struct ceph_msg *msg; 2432 2433 BUG_ON(con->in_msg->con != con); 2434 con->in_msg->con = NULL; 2435 msg = con->in_msg; 2436 con->in_msg = NULL; 2437 con->ops->put(con); 2438 2439 /* if first message, set peer_name */ 2440 if (con->peer_name.type == 0) 2441 con->peer_name = msg->hdr.src; 2442 2443 con->in_seq++; 2444 mutex_unlock(&con->mutex); 2445 2446 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", 2447 msg, le64_to_cpu(msg->hdr.seq), 2448 ENTITY_NAME(msg->hdr.src), 2449 le16_to_cpu(msg->hdr.type), 2450 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), 2451 le32_to_cpu(msg->hdr.front_len), 2452 le32_to_cpu(msg->hdr.data_len), 2453 con->in_front_crc, con->in_middle_crc, con->in_data_crc); 2454 con->ops->dispatch(con, msg); 2455 2456 mutex_lock(&con->mutex); 2457 } 2458 2459 2460 /* 2461 * Write something to the socket. Called in a worker thread when the 2462 * socket appears to be writeable and we have something ready to send. 2463 */ 2464 static int try_write(struct ceph_connection *con) 2465 { 2466 int ret = 1; 2467 2468 dout("try_write start %p state %lu\n", con, con->state); 2469 2470 more: 2471 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); 2472 2473 /* open the socket first? */ 2474 if (con->state == CON_STATE_PREOPEN) { 2475 BUG_ON(con->sock); 2476 con->state = CON_STATE_CONNECTING; 2477 2478 con_out_kvec_reset(con); 2479 prepare_write_banner(con); 2480 prepare_read_banner(con); 2481 2482 BUG_ON(con->in_msg); 2483 con->in_tag = CEPH_MSGR_TAG_READY; 2484 dout("try_write initiating connect on %p new state %lu\n", 2485 con, con->state); 2486 ret = ceph_tcp_connect(con); 2487 if (ret < 0) { 2488 con->error_msg = "connect error"; 2489 goto out; 2490 } 2491 } 2492 2493 more_kvec: 2494 /* kvec data queued? */ 2495 if (con->out_skip) { 2496 ret = write_partial_skip(con); 2497 if (ret <= 0) 2498 goto out; 2499 } 2500 if (con->out_kvec_left) { 2501 ret = write_partial_kvec(con); 2502 if (ret <= 0) 2503 goto out; 2504 } 2505 2506 /* msg pages? */ 2507 if (con->out_msg) { 2508 if (con->out_msg_done) { 2509 ceph_msg_put(con->out_msg); 2510 con->out_msg = NULL; /* we're done with this one */ 2511 goto do_next; 2512 } 2513 2514 ret = write_partial_message_data(con); 2515 if (ret == 1) 2516 goto more_kvec; /* we need to send the footer, too! */ 2517 if (ret == 0) 2518 goto out; 2519 if (ret < 0) { 2520 dout("try_write write_partial_message_data err %d\n", 2521 ret); 2522 goto out; 2523 } 2524 } 2525 2526 do_next: 2527 if (con->state == CON_STATE_OPEN) { 2528 /* is anything else pending? */ 2529 if (!list_empty(&con->out_queue)) { 2530 prepare_write_message(con); 2531 goto more; 2532 } 2533 if (con->in_seq > con->in_seq_acked) { 2534 prepare_write_ack(con); 2535 goto more; 2536 } 2537 if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { 2538 prepare_write_keepalive(con); 2539 goto more; 2540 } 2541 } 2542 2543 /* Nothing to do! */ 2544 con_flag_clear(con, CON_FLAG_WRITE_PENDING); 2545 dout("try_write nothing else to write.\n"); 2546 ret = 0; 2547 out: 2548 dout("try_write done on %p ret %d\n", con, ret); 2549 return ret; 2550 } 2551 2552 2553 2554 /* 2555 * Read what we can from the socket. 2556 */ 2557 static int try_read(struct ceph_connection *con) 2558 { 2559 int ret = -1; 2560 2561 more: 2562 dout("try_read start on %p state %lu\n", con, con->state); 2563 if (con->state != CON_STATE_CONNECTING && 2564 con->state != CON_STATE_NEGOTIATING && 2565 con->state != CON_STATE_OPEN) 2566 return 0; 2567 2568 BUG_ON(!con->sock); 2569 2570 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, 2571 con->in_base_pos); 2572 2573 if (con->state == CON_STATE_CONNECTING) { 2574 dout("try_read connecting\n"); 2575 ret = read_partial_banner(con); 2576 if (ret <= 0) 2577 goto out; 2578 ret = process_banner(con); 2579 if (ret < 0) 2580 goto out; 2581 2582 con->state = CON_STATE_NEGOTIATING; 2583 2584 /* 2585 * Received banner is good, exchange connection info. 2586 * Do not reset out_kvec, as sending our banner raced 2587 * with receiving peer banner after connect completed. 2588 */ 2589 ret = prepare_write_connect(con); 2590 if (ret < 0) 2591 goto out; 2592 prepare_read_connect(con); 2593 2594 /* Send connection info before awaiting response */ 2595 goto out; 2596 } 2597 2598 if (con->state == CON_STATE_NEGOTIATING) { 2599 dout("try_read negotiating\n"); 2600 ret = read_partial_connect(con); 2601 if (ret <= 0) 2602 goto out; 2603 ret = process_connect(con); 2604 if (ret < 0) 2605 goto out; 2606 goto more; 2607 } 2608 2609 WARN_ON(con->state != CON_STATE_OPEN); 2610 2611 if (con->in_base_pos < 0) { 2612 /* 2613 * skipping + discarding content. 2614 * 2615 * FIXME: there must be a better way to do this! 2616 */ 2617 static char buf[SKIP_BUF_SIZE]; 2618 int skip = min((int) sizeof (buf), -con->in_base_pos); 2619 2620 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); 2621 ret = ceph_tcp_recvmsg(con->sock, buf, skip); 2622 if (ret <= 0) 2623 goto out; 2624 con->in_base_pos += ret; 2625 if (con->in_base_pos) 2626 goto more; 2627 } 2628 if (con->in_tag == CEPH_MSGR_TAG_READY) { 2629 /* 2630 * what's next? 2631 */ 2632 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); 2633 if (ret <= 0) 2634 goto out; 2635 dout("try_read got tag %d\n", (int)con->in_tag); 2636 switch (con->in_tag) { 2637 case CEPH_MSGR_TAG_MSG: 2638 prepare_read_message(con); 2639 break; 2640 case CEPH_MSGR_TAG_ACK: 2641 prepare_read_ack(con); 2642 break; 2643 case CEPH_MSGR_TAG_CLOSE: 2644 con_close_socket(con); 2645 con->state = CON_STATE_CLOSED; 2646 goto out; 2647 default: 2648 goto bad_tag; 2649 } 2650 } 2651 if (con->in_tag == CEPH_MSGR_TAG_MSG) { 2652 ret = read_partial_message(con); 2653 if (ret <= 0) { 2654 switch (ret) { 2655 case -EBADMSG: 2656 con->error_msg = "bad crc"; 2657 /* fall through */ 2658 case -EBADE: 2659 ret = -EIO; 2660 break; 2661 case -EIO: 2662 con->error_msg = "io error"; 2663 break; 2664 } 2665 goto out; 2666 } 2667 if (con->in_tag == CEPH_MSGR_TAG_READY) 2668 goto more; 2669 process_message(con); 2670 if (con->state == CON_STATE_OPEN) 2671 prepare_read_tag(con); 2672 goto more; 2673 } 2674 if (con->in_tag == CEPH_MSGR_TAG_ACK || 2675 con->in_tag == CEPH_MSGR_TAG_SEQ) { 2676 /* 2677 * the final handshake seq exchange is semantically 2678 * equivalent to an ACK 2679 */ 2680 ret = read_partial_ack(con); 2681 if (ret <= 0) 2682 goto out; 2683 process_ack(con); 2684 goto more; 2685 } 2686 2687 out: 2688 dout("try_read done on %p ret %d\n", con, ret); 2689 return ret; 2690 2691 bad_tag: 2692 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); 2693 con->error_msg = "protocol error, garbage tag"; 2694 ret = -1; 2695 goto out; 2696 } 2697 2698 2699 /* 2700 * Atomically queue work on a connection after the specified delay. 2701 * Bump @con reference to avoid races with connection teardown. 2702 * Returns 0 if work was queued, or an error code otherwise. 2703 */ 2704 static int queue_con_delay(struct ceph_connection *con, unsigned long delay) 2705 { 2706 if (!con->ops->get(con)) { 2707 dout("%s %p ref count 0\n", __func__, con); 2708 return -ENOENT; 2709 } 2710 2711 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { 2712 dout("%s %p - already queued\n", __func__, con); 2713 con->ops->put(con); 2714 return -EBUSY; 2715 } 2716 2717 dout("%s %p %lu\n", __func__, con, delay); 2718 return 0; 2719 } 2720 2721 static void queue_con(struct ceph_connection *con) 2722 { 2723 (void) queue_con_delay(con, 0); 2724 } 2725 2726 static void cancel_con(struct ceph_connection *con) 2727 { 2728 if (cancel_delayed_work(&con->work)) { 2729 dout("%s %p\n", __func__, con); 2730 con->ops->put(con); 2731 } 2732 } 2733 2734 static bool con_sock_closed(struct ceph_connection *con) 2735 { 2736 if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) 2737 return false; 2738 2739 #define CASE(x) \ 2740 case CON_STATE_ ## x: \ 2741 con->error_msg = "socket closed (con state " #x ")"; \ 2742 break; 2743 2744 switch (con->state) { 2745 CASE(CLOSED); 2746 CASE(PREOPEN); 2747 CASE(CONNECTING); 2748 CASE(NEGOTIATING); 2749 CASE(OPEN); 2750 CASE(STANDBY); 2751 default: 2752 pr_warn("%s con %p unrecognized state %lu\n", 2753 __func__, con, con->state); 2754 con->error_msg = "unrecognized con state"; 2755 BUG(); 2756 break; 2757 } 2758 #undef CASE 2759 2760 return true; 2761 } 2762 2763 static bool con_backoff(struct ceph_connection *con) 2764 { 2765 int ret; 2766 2767 if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) 2768 return false; 2769 2770 ret = queue_con_delay(con, round_jiffies_relative(con->delay)); 2771 if (ret) { 2772 dout("%s: con %p FAILED to back off %lu\n", __func__, 2773 con, con->delay); 2774 BUG_ON(ret == -ENOENT); 2775 con_flag_set(con, CON_FLAG_BACKOFF); 2776 } 2777 2778 return true; 2779 } 2780 2781 /* Finish fault handling; con->mutex must *not* be held here */ 2782 2783 static void con_fault_finish(struct ceph_connection *con) 2784 { 2785 /* 2786 * in case we faulted due to authentication, invalidate our 2787 * current tickets so that we can get new ones. 2788 */ 2789 if (con->auth_retry && con->ops->invalidate_authorizer) { 2790 dout("calling invalidate_authorizer()\n"); 2791 con->ops->invalidate_authorizer(con); 2792 } 2793 2794 if (con->ops->fault) 2795 con->ops->fault(con); 2796 } 2797 2798 /* 2799 * Do some work on a connection. Drop a connection ref when we're done. 2800 */ 2801 static void con_work(struct work_struct *work) 2802 { 2803 struct ceph_connection *con = container_of(work, struct ceph_connection, 2804 work.work); 2805 bool fault; 2806 2807 mutex_lock(&con->mutex); 2808 while (true) { 2809 int ret; 2810 2811 if ((fault = con_sock_closed(con))) { 2812 dout("%s: con %p SOCK_CLOSED\n", __func__, con); 2813 break; 2814 } 2815 if (con_backoff(con)) { 2816 dout("%s: con %p BACKOFF\n", __func__, con); 2817 break; 2818 } 2819 if (con->state == CON_STATE_STANDBY) { 2820 dout("%s: con %p STANDBY\n", __func__, con); 2821 break; 2822 } 2823 if (con->state == CON_STATE_CLOSED) { 2824 dout("%s: con %p CLOSED\n", __func__, con); 2825 BUG_ON(con->sock); 2826 break; 2827 } 2828 if (con->state == CON_STATE_PREOPEN) { 2829 dout("%s: con %p PREOPEN\n", __func__, con); 2830 BUG_ON(con->sock); 2831 } 2832 2833 ret = try_read(con); 2834 if (ret < 0) { 2835 if (ret == -EAGAIN) 2836 continue; 2837 if (!con->error_msg) 2838 con->error_msg = "socket error on read"; 2839 fault = true; 2840 break; 2841 } 2842 2843 ret = try_write(con); 2844 if (ret < 0) { 2845 if (ret == -EAGAIN) 2846 continue; 2847 if (!con->error_msg) 2848 con->error_msg = "socket error on write"; 2849 fault = true; 2850 } 2851 2852 break; /* If we make it to here, we're done */ 2853 } 2854 if (fault) 2855 con_fault(con); 2856 mutex_unlock(&con->mutex); 2857 2858 if (fault) 2859 con_fault_finish(con); 2860 2861 con->ops->put(con); 2862 } 2863 2864 /* 2865 * Generic error/fault handler. A retry mechanism is used with 2866 * exponential backoff 2867 */ 2868 static void con_fault(struct ceph_connection *con) 2869 { 2870 dout("fault %p state %lu to peer %s\n", 2871 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); 2872 2873 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), 2874 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); 2875 con->error_msg = NULL; 2876 2877 WARN_ON(con->state != CON_STATE_CONNECTING && 2878 con->state != CON_STATE_NEGOTIATING && 2879 con->state != CON_STATE_OPEN); 2880 2881 con_close_socket(con); 2882 2883 if (con_flag_test(con, CON_FLAG_LOSSYTX)) { 2884 dout("fault on LOSSYTX channel, marking CLOSED\n"); 2885 con->state = CON_STATE_CLOSED; 2886 return; 2887 } 2888 2889 if (con->in_msg) { 2890 BUG_ON(con->in_msg->con != con); 2891 con->in_msg->con = NULL; 2892 ceph_msg_put(con->in_msg); 2893 con->in_msg = NULL; 2894 con->ops->put(con); 2895 } 2896 2897 /* Requeue anything that hasn't been acked */ 2898 list_splice_init(&con->out_sent, &con->out_queue); 2899 2900 /* If there are no messages queued or keepalive pending, place 2901 * the connection in a STANDBY state */ 2902 if (list_empty(&con->out_queue) && 2903 !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { 2904 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); 2905 con_flag_clear(con, CON_FLAG_WRITE_PENDING); 2906 con->state = CON_STATE_STANDBY; 2907 } else { 2908 /* retry after a delay. */ 2909 con->state = CON_STATE_PREOPEN; 2910 if (con->delay == 0) 2911 con->delay = BASE_DELAY_INTERVAL; 2912 else if (con->delay < MAX_DELAY_INTERVAL) 2913 con->delay *= 2; 2914 con_flag_set(con, CON_FLAG_BACKOFF); 2915 queue_con(con); 2916 } 2917 } 2918 2919 2920 2921 /* 2922 * initialize a new messenger instance 2923 */ 2924 void ceph_messenger_init(struct ceph_messenger *msgr, 2925 struct ceph_entity_addr *myaddr, 2926 u64 supported_features, 2927 u64 required_features, 2928 bool nocrc, 2929 bool tcp_nodelay) 2930 { 2931 msgr->supported_features = supported_features; 2932 msgr->required_features = required_features; 2933 2934 spin_lock_init(&msgr->global_seq_lock); 2935 2936 if (myaddr) 2937 msgr->inst.addr = *myaddr; 2938 2939 /* select a random nonce */ 2940 msgr->inst.addr.type = 0; 2941 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); 2942 encode_my_addr(msgr); 2943 msgr->nocrc = nocrc; 2944 msgr->tcp_nodelay = tcp_nodelay; 2945 2946 atomic_set(&msgr->stopping, 0); 2947 2948 dout("%s %p\n", __func__, msgr); 2949 } 2950 EXPORT_SYMBOL(ceph_messenger_init); 2951 2952 static void clear_standby(struct ceph_connection *con) 2953 { 2954 /* come back from STANDBY? */ 2955 if (con->state == CON_STATE_STANDBY) { 2956 dout("clear_standby %p and ++connect_seq\n", con); 2957 con->state = CON_STATE_PREOPEN; 2958 con->connect_seq++; 2959 WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); 2960 WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); 2961 } 2962 } 2963 2964 /* 2965 * Queue up an outgoing message on the given connection. 2966 */ 2967 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) 2968 { 2969 /* set src+dst */ 2970 msg->hdr.src = con->msgr->inst.name; 2971 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); 2972 msg->needs_out_seq = true; 2973 2974 mutex_lock(&con->mutex); 2975 2976 if (con->state == CON_STATE_CLOSED) { 2977 dout("con_send %p closed, dropping %p\n", con, msg); 2978 ceph_msg_put(msg); 2979 mutex_unlock(&con->mutex); 2980 return; 2981 } 2982 2983 BUG_ON(msg->con != NULL); 2984 msg->con = con->ops->get(con); 2985 BUG_ON(msg->con == NULL); 2986 2987 BUG_ON(!list_empty(&msg->list_head)); 2988 list_add_tail(&msg->list_head, &con->out_queue); 2989 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, 2990 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), 2991 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), 2992 le32_to_cpu(msg->hdr.front_len), 2993 le32_to_cpu(msg->hdr.middle_len), 2994 le32_to_cpu(msg->hdr.data_len)); 2995 2996 clear_standby(con); 2997 mutex_unlock(&con->mutex); 2998 2999 /* if there wasn't anything waiting to send before, queue 3000 * new work */ 3001 if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) 3002 queue_con(con); 3003 } 3004 EXPORT_SYMBOL(ceph_con_send); 3005 3006 /* 3007 * Revoke a message that was previously queued for send 3008 */ 3009 void ceph_msg_revoke(struct ceph_msg *msg) 3010 { 3011 struct ceph_connection *con = msg->con; 3012 3013 if (!con) 3014 return; /* Message not in our possession */ 3015 3016 mutex_lock(&con->mutex); 3017 if (!list_empty(&msg->list_head)) { 3018 dout("%s %p msg %p - was on queue\n", __func__, con, msg); 3019 list_del_init(&msg->list_head); 3020 BUG_ON(msg->con == NULL); 3021 msg->con->ops->put(msg->con); 3022 msg->con = NULL; 3023 msg->hdr.seq = 0; 3024 3025 ceph_msg_put(msg); 3026 } 3027 if (con->out_msg == msg) { 3028 dout("%s %p msg %p - was sending\n", __func__, con, msg); 3029 con->out_msg = NULL; 3030 if (con->out_kvec_is_msg) { 3031 con->out_skip = con->out_kvec_bytes; 3032 con->out_kvec_is_msg = false; 3033 } 3034 msg->hdr.seq = 0; 3035 3036 ceph_msg_put(msg); 3037 } 3038 mutex_unlock(&con->mutex); 3039 } 3040 3041 /* 3042 * Revoke a message that we may be reading data into 3043 */ 3044 void ceph_msg_revoke_incoming(struct ceph_msg *msg) 3045 { 3046 struct ceph_connection *con; 3047 3048 BUG_ON(msg == NULL); 3049 if (!msg->con) { 3050 dout("%s msg %p null con\n", __func__, msg); 3051 3052 return; /* Message not in our possession */ 3053 } 3054 3055 con = msg->con; 3056 mutex_lock(&con->mutex); 3057 if (con->in_msg == msg) { 3058 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); 3059 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); 3060 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); 3061 3062 /* skip rest of message */ 3063 dout("%s %p msg %p revoked\n", __func__, con, msg); 3064 con->in_base_pos = con->in_base_pos - 3065 sizeof(struct ceph_msg_header) - 3066 front_len - 3067 middle_len - 3068 data_len - 3069 sizeof(struct ceph_msg_footer); 3070 ceph_msg_put(con->in_msg); 3071 con->in_msg = NULL; 3072 con->in_tag = CEPH_MSGR_TAG_READY; 3073 con->in_seq++; 3074 } else { 3075 dout("%s %p in_msg %p msg %p no-op\n", 3076 __func__, con, con->in_msg, msg); 3077 } 3078 mutex_unlock(&con->mutex); 3079 } 3080 3081 /* 3082 * Queue a keepalive byte to ensure the tcp connection is alive. 3083 */ 3084 void ceph_con_keepalive(struct ceph_connection *con) 3085 { 3086 dout("con_keepalive %p\n", con); 3087 mutex_lock(&con->mutex); 3088 clear_standby(con); 3089 mutex_unlock(&con->mutex); 3090 if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && 3091 con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) 3092 queue_con(con); 3093 } 3094 EXPORT_SYMBOL(ceph_con_keepalive); 3095 3096 static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) 3097 { 3098 struct ceph_msg_data *data; 3099 3100 if (WARN_ON(!ceph_msg_data_type_valid(type))) 3101 return NULL; 3102 3103 data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS); 3104 if (data) 3105 data->type = type; 3106 INIT_LIST_HEAD(&data->links); 3107 3108 return data; 3109 } 3110 3111 static void ceph_msg_data_destroy(struct ceph_msg_data *data) 3112 { 3113 if (!data) 3114 return; 3115 3116 WARN_ON(!list_empty(&data->links)); 3117 if (data->type == CEPH_MSG_DATA_PAGELIST) 3118 ceph_pagelist_release(data->pagelist); 3119 kmem_cache_free(ceph_msg_data_cache, data); 3120 } 3121 3122 void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, 3123 size_t length, size_t alignment) 3124 { 3125 struct ceph_msg_data *data; 3126 3127 BUG_ON(!pages); 3128 BUG_ON(!length); 3129 3130 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); 3131 BUG_ON(!data); 3132 data->pages = pages; 3133 data->length = length; 3134 data->alignment = alignment & ~PAGE_MASK; 3135 3136 list_add_tail(&data->links, &msg->data); 3137 msg->data_length += length; 3138 } 3139 EXPORT_SYMBOL(ceph_msg_data_add_pages); 3140 3141 void ceph_msg_data_add_pagelist(struct ceph_msg *msg, 3142 struct ceph_pagelist *pagelist) 3143 { 3144 struct ceph_msg_data *data; 3145 3146 BUG_ON(!pagelist); 3147 BUG_ON(!pagelist->length); 3148 3149 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); 3150 BUG_ON(!data); 3151 data->pagelist = pagelist; 3152 3153 list_add_tail(&data->links, &msg->data); 3154 msg->data_length += pagelist->length; 3155 } 3156 EXPORT_SYMBOL(ceph_msg_data_add_pagelist); 3157 3158 #ifdef CONFIG_BLOCK 3159 void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, 3160 size_t length) 3161 { 3162 struct ceph_msg_data *data; 3163 3164 BUG_ON(!bio); 3165 3166 data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); 3167 BUG_ON(!data); 3168 data->bio = bio; 3169 data->bio_length = length; 3170 3171 list_add_tail(&data->links, &msg->data); 3172 msg->data_length += length; 3173 } 3174 EXPORT_SYMBOL(ceph_msg_data_add_bio); 3175 #endif /* CONFIG_BLOCK */ 3176 3177 /* 3178 * construct a new message with given type, size 3179 * the new msg has a ref count of 1. 3180 */ 3181 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 3182 bool can_fail) 3183 { 3184 struct ceph_msg *m; 3185 3186 m = kmem_cache_zalloc(ceph_msg_cache, flags); 3187 if (m == NULL) 3188 goto out; 3189 3190 m->hdr.type = cpu_to_le16(type); 3191 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); 3192 m->hdr.front_len = cpu_to_le32(front_len); 3193 3194 INIT_LIST_HEAD(&m->list_head); 3195 kref_init(&m->kref); 3196 INIT_LIST_HEAD(&m->data); 3197 3198 /* front */ 3199 if (front_len) { 3200 m->front.iov_base = ceph_kvmalloc(front_len, flags); 3201 if (m->front.iov_base == NULL) { 3202 dout("ceph_msg_new can't allocate %d bytes\n", 3203 front_len); 3204 goto out2; 3205 } 3206 } else { 3207 m->front.iov_base = NULL; 3208 } 3209 m->front_alloc_len = m->front.iov_len = front_len; 3210 3211 dout("ceph_msg_new %p front %d\n", m, front_len); 3212 return m; 3213 3214 out2: 3215 ceph_msg_put(m); 3216 out: 3217 if (!can_fail) { 3218 pr_err("msg_new can't create type %d front %d\n", type, 3219 front_len); 3220 WARN_ON(1); 3221 } else { 3222 dout("msg_new can't create type %d front %d\n", type, 3223 front_len); 3224 } 3225 return NULL; 3226 } 3227 EXPORT_SYMBOL(ceph_msg_new); 3228 3229 /* 3230 * Allocate "middle" portion of a message, if it is needed and wasn't 3231 * allocated by alloc_msg. This allows us to read a small fixed-size 3232 * per-type header in the front and then gracefully fail (i.e., 3233 * propagate the error to the caller based on info in the front) when 3234 * the middle is too large. 3235 */ 3236 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) 3237 { 3238 int type = le16_to_cpu(msg->hdr.type); 3239 int middle_len = le32_to_cpu(msg->hdr.middle_len); 3240 3241 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, 3242 ceph_msg_type_name(type), middle_len); 3243 BUG_ON(!middle_len); 3244 BUG_ON(msg->middle); 3245 3246 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); 3247 if (!msg->middle) 3248 return -ENOMEM; 3249 return 0; 3250 } 3251 3252 /* 3253 * Allocate a message for receiving an incoming message on a 3254 * connection, and save the result in con->in_msg. Uses the 3255 * connection's private alloc_msg op if available. 3256 * 3257 * Returns 0 on success, or a negative error code. 3258 * 3259 * On success, if we set *skip = 1: 3260 * - the next message should be skipped and ignored. 3261 * - con->in_msg == NULL 3262 * or if we set *skip = 0: 3263 * - con->in_msg is non-null. 3264 * On error (ENOMEM, EAGAIN, ...), 3265 * - con->in_msg == NULL 3266 */ 3267 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) 3268 { 3269 struct ceph_msg_header *hdr = &con->in_hdr; 3270 int middle_len = le32_to_cpu(hdr->middle_len); 3271 struct ceph_msg *msg; 3272 int ret = 0; 3273 3274 BUG_ON(con->in_msg != NULL); 3275 BUG_ON(!con->ops->alloc_msg); 3276 3277 mutex_unlock(&con->mutex); 3278 msg = con->ops->alloc_msg(con, hdr, skip); 3279 mutex_lock(&con->mutex); 3280 if (con->state != CON_STATE_OPEN) { 3281 if (msg) 3282 ceph_msg_put(msg); 3283 return -EAGAIN; 3284 } 3285 if (msg) { 3286 BUG_ON(*skip); 3287 con->in_msg = msg; 3288 con->in_msg->con = con->ops->get(con); 3289 BUG_ON(con->in_msg->con == NULL); 3290 } else { 3291 /* 3292 * Null message pointer means either we should skip 3293 * this message or we couldn't allocate memory. The 3294 * former is not an error. 3295 */ 3296 if (*skip) 3297 return 0; 3298 3299 con->error_msg = "error allocating memory for incoming message"; 3300 return -ENOMEM; 3301 } 3302 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); 3303 3304 if (middle_len && !con->in_msg->middle) { 3305 ret = ceph_alloc_middle(con, con->in_msg); 3306 if (ret < 0) { 3307 ceph_msg_put(con->in_msg); 3308 con->in_msg = NULL; 3309 } 3310 } 3311 3312 return ret; 3313 } 3314 3315 3316 /* 3317 * Free a generically kmalloc'd message. 3318 */ 3319 static void ceph_msg_free(struct ceph_msg *m) 3320 { 3321 dout("%s %p\n", __func__, m); 3322 kvfree(m->front.iov_base); 3323 kmem_cache_free(ceph_msg_cache, m); 3324 } 3325 3326 static void ceph_msg_release(struct kref *kref) 3327 { 3328 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); 3329 LIST_HEAD(data); 3330 struct list_head *links; 3331 struct list_head *next; 3332 3333 dout("%s %p\n", __func__, m); 3334 WARN_ON(!list_empty(&m->list_head)); 3335 3336 /* drop middle, data, if any */ 3337 if (m->middle) { 3338 ceph_buffer_put(m->middle); 3339 m->middle = NULL; 3340 } 3341 3342 list_splice_init(&m->data, &data); 3343 list_for_each_safe(links, next, &data) { 3344 struct ceph_msg_data *data; 3345 3346 data = list_entry(links, struct ceph_msg_data, links); 3347 list_del_init(links); 3348 ceph_msg_data_destroy(data); 3349 } 3350 m->data_length = 0; 3351 3352 if (m->pool) 3353 ceph_msgpool_put(m->pool, m); 3354 else 3355 ceph_msg_free(m); 3356 } 3357 3358 struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 3359 { 3360 dout("%s %p (was %d)\n", __func__, msg, 3361 atomic_read(&msg->kref.refcount)); 3362 kref_get(&msg->kref); 3363 return msg; 3364 } 3365 EXPORT_SYMBOL(ceph_msg_get); 3366 3367 void ceph_msg_put(struct ceph_msg *msg) 3368 { 3369 dout("%s %p (was %d)\n", __func__, msg, 3370 atomic_read(&msg->kref.refcount)); 3371 kref_put(&msg->kref, ceph_msg_release); 3372 } 3373 EXPORT_SYMBOL(ceph_msg_put); 3374 3375 void ceph_msg_dump(struct ceph_msg *msg) 3376 { 3377 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg, 3378 msg->front_alloc_len, msg->data_length); 3379 print_hex_dump(KERN_DEBUG, "header: ", 3380 DUMP_PREFIX_OFFSET, 16, 1, 3381 &msg->hdr, sizeof(msg->hdr), true); 3382 print_hex_dump(KERN_DEBUG, " front: ", 3383 DUMP_PREFIX_OFFSET, 16, 1, 3384 msg->front.iov_base, msg->front.iov_len, true); 3385 if (msg->middle) 3386 print_hex_dump(KERN_DEBUG, "middle: ", 3387 DUMP_PREFIX_OFFSET, 16, 1, 3388 msg->middle->vec.iov_base, 3389 msg->middle->vec.iov_len, true); 3390 print_hex_dump(KERN_DEBUG, "footer: ", 3391 DUMP_PREFIX_OFFSET, 16, 1, 3392 &msg->footer, sizeof(msg->footer), true); 3393 } 3394 EXPORT_SYMBOL(ceph_msg_dump); 3395