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Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / ceph / messenger_v2.c
blobc38d8de93836371f0beb51bee80c1ef9b81485f2
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Ceph msgr2 protocol implementation
4 *
5 * Copyright (C) 2020 Ilya Dryomov <idryomov@gmail.com>
6 */
7
8 #include <linux/ceph/ceph_debug.h>
9
10 #include <crypto/aead.h>
11 #include <crypto/algapi.h> /* for crypto_memneq() */
12 #include <crypto/hash.h>
13 #include <crypto/sha2.h>
14 #include <linux/bvec.h>
15 #include <linux/crc32c.h>
16 #include <linux/net.h>
17 #include <linux/scatterlist.h>
18 #include <linux/socket.h>
19 #include <linux/sched/mm.h>
20 #include <net/sock.h>
21 #include <net/tcp.h>
22
23 #include <linux/ceph/ceph_features.h>
24 #include <linux/ceph/decode.h>
25 #include <linux/ceph/libceph.h>
26 #include <linux/ceph/messenger.h>
27
28 #include "crypto.h" /* for CEPH_KEY_LEN and CEPH_MAX_CON_SECRET_LEN */
29
30 #define FRAME_TAG_HELLO 1
31 #define FRAME_TAG_AUTH_REQUEST 2
32 #define FRAME_TAG_AUTH_BAD_METHOD 3
33 #define FRAME_TAG_AUTH_REPLY_MORE 4
34 #define FRAME_TAG_AUTH_REQUEST_MORE 5
35 #define FRAME_TAG_AUTH_DONE 6
36 #define FRAME_TAG_AUTH_SIGNATURE 7
37 #define FRAME_TAG_CLIENT_IDENT 8
38 #define FRAME_TAG_SERVER_IDENT 9
39 #define FRAME_TAG_IDENT_MISSING_FEATURES 10
40 #define FRAME_TAG_SESSION_RECONNECT 11
41 #define FRAME_TAG_SESSION_RESET 12
42 #define FRAME_TAG_SESSION_RETRY 13
43 #define FRAME_TAG_SESSION_RETRY_GLOBAL 14
44 #define FRAME_TAG_SESSION_RECONNECT_OK 15
45 #define FRAME_TAG_WAIT 16
46 #define FRAME_TAG_MESSAGE 17
47 #define FRAME_TAG_KEEPALIVE2 18
48 #define FRAME_TAG_KEEPALIVE2_ACK 19
49 #define FRAME_TAG_ACK 20
50
51 #define FRAME_LATE_STATUS_ABORTED 0x1
52 #define FRAME_LATE_STATUS_COMPLETE 0xe
53 #define FRAME_LATE_STATUS_ABORTED_MASK 0xf
54
55 #define IN_S_HANDLE_PREAMBLE 1
56 #define IN_S_HANDLE_CONTROL 2
57 #define IN_S_HANDLE_CONTROL_REMAINDER 3
58 #define IN_S_PREPARE_READ_DATA 4
59 #define IN_S_PREPARE_READ_DATA_CONT 5
60 #define IN_S_HANDLE_EPILOGUE 6
61 #define IN_S_FINISH_SKIP 7
62
63 #define OUT_S_QUEUE_DATA 1
64 #define OUT_S_QUEUE_DATA_CONT 2
65 #define OUT_S_QUEUE_ENC_PAGE 3
66 #define OUT_S_QUEUE_ZEROS 4
67 #define OUT_S_FINISH_MESSAGE 5
68 #define OUT_S_GET_NEXT 6
69
70 #define CTRL_BODY(p) ((void *)(p) + CEPH_PREAMBLE_LEN)
71 #define FRONT_PAD(p) ((void *)(p) + CEPH_EPILOGUE_SECURE_LEN)
72 #define MIDDLE_PAD(p) (FRONT_PAD(p) + CEPH_GCM_BLOCK_LEN)
73 #define DATA_PAD(p) (MIDDLE_PAD(p) + CEPH_GCM_BLOCK_LEN)
74
75 #define CEPH_MSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
76
77 static int do_recvmsg(struct socket *sock, struct iov_iter *it)
78 {
79 struct msghdr msg = { .msg_flags = CEPH_MSG_FLAGS };
80 int ret;
81
82 msg.msg_iter = *it;
83 while (iov_iter_count(it)) {
84 ret = sock_recvmsg(sock, &msg, msg.msg_flags);
85 if (ret <= 0) {
86 if (ret == -EAGAIN)
87 ret = 0;
88 return ret;
89 }
90
91 iov_iter_advance(it, ret);
92 }
93
94 WARN_ON(msg_data_left(&msg));
95 return 1;
96 }
97
98 /*
99 * Read as much as possible.
100 *
101 * Return:
102 * 1 - done, nothing (else) to read
103 * 0 - socket is empty, need to wait
104 * <0 - error
105 */
106 static int ceph_tcp_recv(struct ceph_connection *con)
107 {
108 int ret;
109
110 dout("%s con %p %s %zu\n", __func__, con,
111 iov_iter_is_discard(&con->v2.in_iter) ? "discard" : "need",
112 iov_iter_count(&con->v2.in_iter));
113 ret = do_recvmsg(con->sock, &con->v2.in_iter);
114 dout("%s con %p ret %d left %zu\n", __func__, con, ret,
115 iov_iter_count(&con->v2.in_iter));
116 return ret;
117 }
118
119 static int do_sendmsg(struct socket *sock, struct iov_iter *it)
120 {
121 struct msghdr msg = { .msg_flags = CEPH_MSG_FLAGS };
122 int ret;
123
124 msg.msg_iter = *it;
125 while (iov_iter_count(it)) {
126 ret = sock_sendmsg(sock, &msg);
127 if (ret <= 0) {
128 if (ret == -EAGAIN)
129 ret = 0;
130 return ret;
131 }
132
133 iov_iter_advance(it, ret);
134 }
135
136 WARN_ON(msg_data_left(&msg));
137 return 1;
138 }
139
140 static int do_try_sendpage(struct socket *sock, struct iov_iter *it)
141 {
142 struct msghdr msg = { .msg_flags = CEPH_MSG_FLAGS };
143 struct bio_vec bv;
144 int ret;
145
146 if (WARN_ON(!iov_iter_is_bvec(it)))
147 return -EINVAL;
148
149 while (iov_iter_count(it)) {
150 /* iov_iter_iovec() for ITER_BVEC */
151 bv.bv_page = it->bvec->bv_page;
152 bv.bv_offset = it->bvec->bv_offset + it->iov_offset;
153 bv.bv_len = min(iov_iter_count(it),
154 it->bvec->bv_len - it->iov_offset);
155
156 /*
157 * sendpage cannot properly handle pages with
158 * page_count == 0, we need to fall back to sendmsg if
159 * that's the case.
160 *
161 * Same goes for slab pages: skb_can_coalesce() allows
162 * coalescing neighboring slab objects into a single frag
163 * which triggers one of hardened usercopy checks.
164 */
165 if (sendpage_ok(bv.bv_page)) {
166 ret = sock->ops->sendpage(sock, bv.bv_page,
167 bv.bv_offset, bv.bv_len,
168 CEPH_MSG_FLAGS);
169 } else {
170 iov_iter_bvec(&msg.msg_iter, WRITE, &bv, 1, bv.bv_len);
171 ret = sock_sendmsg(sock, &msg);
172 }
173 if (ret <= 0) {
174 if (ret == -EAGAIN)
175 ret = 0;
176 return ret;
177 }
178
179 iov_iter_advance(it, ret);
180 }
181
182 return 1;
183 }
184
185 /*
186 * Write as much as possible. The socket is expected to be corked,
187 * so we don't bother with MSG_MORE/MSG_SENDPAGE_NOTLAST here.
188 *
189 * Return:
190 * 1 - done, nothing (else) to write
191 * 0 - socket is full, need to wait
192 * <0 - error
193 */
194 static int ceph_tcp_send(struct ceph_connection *con)
195 {
196 int ret;
197
198 dout("%s con %p have %zu try_sendpage %d\n", __func__, con,
199 iov_iter_count(&con->v2.out_iter), con->v2.out_iter_sendpage);
200 if (con->v2.out_iter_sendpage)
201 ret = do_try_sendpage(con->sock, &con->v2.out_iter);
202 else
203 ret = do_sendmsg(con->sock, &con->v2.out_iter);
204 dout("%s con %p ret %d left %zu\n", __func__, con, ret,
205 iov_iter_count(&con->v2.out_iter));
206 return ret;
207 }
208
209 static void add_in_kvec(struct ceph_connection *con, void *buf, int len)
210 {
211 BUG_ON(con->v2.in_kvec_cnt >= ARRAY_SIZE(con->v2.in_kvecs));
212 WARN_ON(!iov_iter_is_kvec(&con->v2.in_iter));
213
214 con->v2.in_kvecs[con->v2.in_kvec_cnt].iov_base = buf;
215 con->v2.in_kvecs[con->v2.in_kvec_cnt].iov_len = len;
216 con->v2.in_kvec_cnt++;
217
218 con->v2.in_iter.nr_segs++;
219 con->v2.in_iter.count += len;
220 }
221
222 static void reset_in_kvecs(struct ceph_connection *con)
223 {
224 WARN_ON(iov_iter_count(&con->v2.in_iter));
225
226 con->v2.in_kvec_cnt = 0;
227 iov_iter_kvec(&con->v2.in_iter, READ, con->v2.in_kvecs, 0, 0);
228 }
229
230 static void set_in_bvec(struct ceph_connection *con, const struct bio_vec *bv)
231 {
232 WARN_ON(iov_iter_count(&con->v2.in_iter));
233
234 con->v2.in_bvec = *bv;
235 iov_iter_bvec(&con->v2.in_iter, READ, &con->v2.in_bvec, 1, bv->bv_len);
236 }
237
238 static void set_in_skip(struct ceph_connection *con, int len)
239 {
240 WARN_ON(iov_iter_count(&con->v2.in_iter));
241
242 dout("%s con %p len %d\n", __func__, con, len);
243 iov_iter_discard(&con->v2.in_iter, READ, len);
244 }
245
246 static void add_out_kvec(struct ceph_connection *con, void *buf, int len)
247 {
248 BUG_ON(con->v2.out_kvec_cnt >= ARRAY_SIZE(con->v2.out_kvecs));
249 WARN_ON(!iov_iter_is_kvec(&con->v2.out_iter));
250 WARN_ON(con->v2.out_zero);
251
252 con->v2.out_kvecs[con->v2.out_kvec_cnt].iov_base = buf;
253 con->v2.out_kvecs[con->v2.out_kvec_cnt].iov_len = len;
254 con->v2.out_kvec_cnt++;
255
256 con->v2.out_iter.nr_segs++;
257 con->v2.out_iter.count += len;
258 }
259
260 static void reset_out_kvecs(struct ceph_connection *con)
261 {
262 WARN_ON(iov_iter_count(&con->v2.out_iter));
263 WARN_ON(con->v2.out_zero);
264
265 con->v2.out_kvec_cnt = 0;
266
267 iov_iter_kvec(&con->v2.out_iter, WRITE, con->v2.out_kvecs, 0, 0);
268 con->v2.out_iter_sendpage = false;
269 }
270
271 static void set_out_bvec(struct ceph_connection *con, const struct bio_vec *bv,
272 bool zerocopy)
273 {
274 WARN_ON(iov_iter_count(&con->v2.out_iter));
275 WARN_ON(con->v2.out_zero);
276
277 con->v2.out_bvec = *bv;
278 con->v2.out_iter_sendpage = zerocopy;
279 iov_iter_bvec(&con->v2.out_iter, WRITE, &con->v2.out_bvec, 1,
280 con->v2.out_bvec.bv_len);
281 }
282
283 static void set_out_bvec_zero(struct ceph_connection *con)
284 {
285 WARN_ON(iov_iter_count(&con->v2.out_iter));
286 WARN_ON(!con->v2.out_zero);
287
288 con->v2.out_bvec.bv_page = ceph_zero_page;
289 con->v2.out_bvec.bv_offset = 0;
290 con->v2.out_bvec.bv_len = min(con->v2.out_zero, (int)PAGE_SIZE);
291 con->v2.out_iter_sendpage = true;
292 iov_iter_bvec(&con->v2.out_iter, WRITE, &con->v2.out_bvec, 1,
293 con->v2.out_bvec.bv_len);
294 }
295
296 static void out_zero_add(struct ceph_connection *con, int len)
297 {
298 dout("%s con %p len %d\n", __func__, con, len);
299 con->v2.out_zero += len;
300 }
301
302 static void *alloc_conn_buf(struct ceph_connection *con, int len)
303 {
304 void *buf;
305
306 dout("%s con %p len %d\n", __func__, con, len);
307
308 if (WARN_ON(con->v2.conn_buf_cnt >= ARRAY_SIZE(con->v2.conn_bufs)))
309 return NULL;
310
311 buf = ceph_kvmalloc(len, GFP_NOIO);
312 if (!buf)
313 return NULL;
314
315 con->v2.conn_bufs[con->v2.conn_buf_cnt++] = buf;
316 return buf;
317 }
318
319 static void free_conn_bufs(struct ceph_connection *con)
320 {
321 while (con->v2.conn_buf_cnt)
322 kvfree(con->v2.conn_bufs[--con->v2.conn_buf_cnt]);
323 }
324
325 static void add_in_sign_kvec(struct ceph_connection *con, void *buf, int len)
326 {
327 BUG_ON(con->v2.in_sign_kvec_cnt >= ARRAY_SIZE(con->v2.in_sign_kvecs));
328
329 con->v2.in_sign_kvecs[con->v2.in_sign_kvec_cnt].iov_base = buf;
330 con->v2.in_sign_kvecs[con->v2.in_sign_kvec_cnt].iov_len = len;
331 con->v2.in_sign_kvec_cnt++;
332 }
333
334 static void clear_in_sign_kvecs(struct ceph_connection *con)
335 {
336 con->v2.in_sign_kvec_cnt = 0;
337 }
338
339 static void add_out_sign_kvec(struct ceph_connection *con, void *buf, int len)
340 {
341 BUG_ON(con->v2.out_sign_kvec_cnt >= ARRAY_SIZE(con->v2.out_sign_kvecs));
342
343 con->v2.out_sign_kvecs[con->v2.out_sign_kvec_cnt].iov_base = buf;
344 con->v2.out_sign_kvecs[con->v2.out_sign_kvec_cnt].iov_len = len;
345 con->v2.out_sign_kvec_cnt++;
346 }
347
348 static void clear_out_sign_kvecs(struct ceph_connection *con)
349 {
350 con->v2.out_sign_kvec_cnt = 0;
351 }
352
353 static bool con_secure(struct ceph_connection *con)
354 {
355 return con->v2.con_mode == CEPH_CON_MODE_SECURE;
356 }
357
358 static int front_len(const struct ceph_msg *msg)
359 {
360 return le32_to_cpu(msg->hdr.front_len);
361 }
362
363 static int middle_len(const struct ceph_msg *msg)
364 {
365 return le32_to_cpu(msg->hdr.middle_len);
366 }
367
368 static int data_len(const struct ceph_msg *msg)
369 {
370 return le32_to_cpu(msg->hdr.data_len);
371 }
372
373 static bool need_padding(int len)
374 {
375 return !IS_ALIGNED(len, CEPH_GCM_BLOCK_LEN);
376 }
377
378 static int padded_len(int len)
379 {
380 return ALIGN(len, CEPH_GCM_BLOCK_LEN);
381 }
382
383 static int padding_len(int len)
384 {
385 return padded_len(len) - len;
386 }
387
388 /* preamble + control segment */
389 static int head_onwire_len(int ctrl_len, bool secure)
390 {
391 int head_len;
392 int rem_len;
393
394 if (secure) {
395 head_len = CEPH_PREAMBLE_SECURE_LEN;
396 if (ctrl_len > CEPH_PREAMBLE_INLINE_LEN) {
397 rem_len = ctrl_len - CEPH_PREAMBLE_INLINE_LEN;
398 head_len += padded_len(rem_len) + CEPH_GCM_TAG_LEN;
399 }
400 } else {
401 head_len = CEPH_PREAMBLE_PLAIN_LEN;
402 if (ctrl_len)
403 head_len += ctrl_len + CEPH_CRC_LEN;
404 }
405 return head_len;
406 }
407
408 /* front, middle and data segments + epilogue */
409 static int __tail_onwire_len(int front_len, int middle_len, int data_len,
410 bool secure)
411 {
412 if (!front_len && !middle_len && !data_len)
413 return 0;
414
415 if (!secure)
416 return front_len + middle_len + data_len +
417 CEPH_EPILOGUE_PLAIN_LEN;
418
419 return padded_len(front_len) + padded_len(middle_len) +
420 padded_len(data_len) + CEPH_EPILOGUE_SECURE_LEN;
421 }
422
423 static int tail_onwire_len(const struct ceph_msg *msg, bool secure)
424 {
425 return __tail_onwire_len(front_len(msg), middle_len(msg),
426 data_len(msg), secure);
427 }
428
429 /* head_onwire_len(sizeof(struct ceph_msg_header2), false) */
430 #define MESSAGE_HEAD_PLAIN_LEN (CEPH_PREAMBLE_PLAIN_LEN + \
431 sizeof(struct ceph_msg_header2) + \
432 CEPH_CRC_LEN)
433
434 static const int frame_aligns[] = {
435 sizeof(void *),
436 sizeof(void *),
437 sizeof(void *),
438 PAGE_SIZE
439 };
440
441 /*
442 * Discards trailing empty segments, unless there is just one segment.
443 * A frame always has at least one (possibly empty) segment.
444 */
445 static int calc_segment_count(const int *lens, int len_cnt)
446 {
447 int i;
448
449 for (i = len_cnt - 1; i >= 0; i--) {
450 if (lens[i])
451 return i + 1;
452 }
453
454 return 1;
455 }
456
457 static void init_frame_desc(struct ceph_frame_desc *desc, int tag,
458 const int *lens, int len_cnt)
459 {
460 int i;
461
462 memset(desc, 0, sizeof(*desc));
463
464 desc->fd_tag = tag;
465 desc->fd_seg_cnt = calc_segment_count(lens, len_cnt);
466 BUG_ON(desc->fd_seg_cnt > CEPH_FRAME_MAX_SEGMENT_COUNT);
467 for (i = 0; i < desc->fd_seg_cnt; i++) {
468 desc->fd_lens[i] = lens[i];
469 desc->fd_aligns[i] = frame_aligns[i];
470 }
471 }
472
473 /*
474 * Preamble crc covers everything up to itself (28 bytes) and
475 * is calculated and verified irrespective of the connection mode
476 * (i.e. even if the frame is encrypted).
477 */
478 static void encode_preamble(const struct ceph_frame_desc *desc, void *p)
479 {
480 void *crcp = p + CEPH_PREAMBLE_LEN - CEPH_CRC_LEN;
481 void *start = p;
482 int i;
483
484 memset(p, 0, CEPH_PREAMBLE_LEN);
485
486 ceph_encode_8(&p, desc->fd_tag);
487 ceph_encode_8(&p, desc->fd_seg_cnt);
488 for (i = 0; i < desc->fd_seg_cnt; i++) {
489 ceph_encode_32(&p, desc->fd_lens[i]);
490 ceph_encode_16(&p, desc->fd_aligns[i]);
491 }
492
493 put_unaligned_le32(crc32c(0, start, crcp - start), crcp);
494 }
495
496 static int decode_preamble(void *p, struct ceph_frame_desc *desc)
497 {
498 void *crcp = p + CEPH_PREAMBLE_LEN - CEPH_CRC_LEN;
499 u32 crc, expected_crc;
500 int i;
501
502 crc = crc32c(0, p, crcp - p);
503 expected_crc = get_unaligned_le32(crcp);
504 if (crc != expected_crc) {
505 pr_err("bad preamble crc, calculated %u, expected %u\n",
506 crc, expected_crc);
507 return -EBADMSG;
508 }
509
510 memset(desc, 0, sizeof(*desc));
511
512 desc->fd_tag = ceph_decode_8(&p);
513 desc->fd_seg_cnt = ceph_decode_8(&p);
514 if (desc->fd_seg_cnt < 1 ||
515 desc->fd_seg_cnt > CEPH_FRAME_MAX_SEGMENT_COUNT) {
516 pr_err("bad segment count %d\n", desc->fd_seg_cnt);
517 return -EINVAL;
518 }
519 for (i = 0; i < desc->fd_seg_cnt; i++) {
520 desc->fd_lens[i] = ceph_decode_32(&p);
521 desc->fd_aligns[i] = ceph_decode_16(&p);
522 }
523
524 /*
525 * This would fire for FRAME_TAG_WAIT (it has one empty
526 * segment), but we should never get it as client.
527 */
528 if (!desc->fd_lens[desc->fd_seg_cnt - 1]) {
529 pr_err("last segment empty\n");
530 return -EINVAL;
531 }
532
533 if (desc->fd_lens[0] > CEPH_MSG_MAX_CONTROL_LEN) {
534 pr_err("control segment too big %d\n", desc->fd_lens[0]);
535 return -EINVAL;
536 }
537 if (desc->fd_lens[1] > CEPH_MSG_MAX_FRONT_LEN) {
538 pr_err("front segment too big %d\n", desc->fd_lens[1]);
539 return -EINVAL;
540 }
541 if (desc->fd_lens[2] > CEPH_MSG_MAX_MIDDLE_LEN) {
542 pr_err("middle segment too big %d\n", desc->fd_lens[2]);
543 return -EINVAL;
544 }
545 if (desc->fd_lens[3] > CEPH_MSG_MAX_DATA_LEN) {
546 pr_err("data segment too big %d\n", desc->fd_lens[3]);
547 return -EINVAL;
548 }
549
550 return 0;
551 }
552
553 static void encode_epilogue_plain(struct ceph_connection *con, bool aborted)
554 {
555 con->v2.out_epil.late_status = aborted ? FRAME_LATE_STATUS_ABORTED :
556 FRAME_LATE_STATUS_COMPLETE;
557 cpu_to_le32s(&con->v2.out_epil.front_crc);
558 cpu_to_le32s(&con->v2.out_epil.middle_crc);
559 cpu_to_le32s(&con->v2.out_epil.data_crc);
560 }
561
562 static void encode_epilogue_secure(struct ceph_connection *con, bool aborted)
563 {
564 memset(&con->v2.out_epil, 0, sizeof(con->v2.out_epil));
565 con->v2.out_epil.late_status = aborted ? FRAME_LATE_STATUS_ABORTED :
566 FRAME_LATE_STATUS_COMPLETE;
567 }
568
569 static int decode_epilogue(void *p, u32 *front_crc, u32 *middle_crc,
570 u32 *data_crc)
571 {
572 u8 late_status;
573
574 late_status = ceph_decode_8(&p);
575 if ((late_status & FRAME_LATE_STATUS_ABORTED_MASK) !=
576 FRAME_LATE_STATUS_COMPLETE) {
577 /* we should never get an aborted message as client */
578 pr_err("bad late_status 0x%x\n", late_status);
579 return -EINVAL;
580 }
581
582 if (front_crc && middle_crc && data_crc) {
583 *front_crc = ceph_decode_32(&p);
584 *middle_crc = ceph_decode_32(&p);
585 *data_crc = ceph_decode_32(&p);
586 }
587
588 return 0;
589 }
590
591 static void fill_header(struct ceph_msg_header *hdr,
592 const struct ceph_msg_header2 *hdr2,
593 int front_len, int middle_len, int data_len,
594 const struct ceph_entity_name *peer_name)
595 {
596 hdr->seq = hdr2->seq;
597 hdr->tid = hdr2->tid;
598 hdr->type = hdr2->type;
599 hdr->priority = hdr2->priority;
600 hdr->version = hdr2->version;
601 hdr->front_len = cpu_to_le32(front_len);
602 hdr->middle_len = cpu_to_le32(middle_len);
603 hdr->data_len = cpu_to_le32(data_len);
604 hdr->data_off = hdr2->data_off;
605 hdr->src = *peer_name;
606 hdr->compat_version = hdr2->compat_version;
607 hdr->reserved = 0;
608 hdr->crc = 0;
609 }
610
611 static void fill_header2(struct ceph_msg_header2 *hdr2,
612 const struct ceph_msg_header *hdr, u64 ack_seq)
613 {
614 hdr2->seq = hdr->seq;
615 hdr2->tid = hdr->tid;
616 hdr2->type = hdr->type;
617 hdr2->priority = hdr->priority;
618 hdr2->version = hdr->version;
619 hdr2->data_pre_padding_len = 0;
620 hdr2->data_off = hdr->data_off;
621 hdr2->ack_seq = cpu_to_le64(ack_seq);
622 hdr2->flags = 0;
623 hdr2->compat_version = hdr->compat_version;
624 hdr2->reserved = 0;
625 }
626
627 static int verify_control_crc(struct ceph_connection *con)
628 {
629 int ctrl_len = con->v2.in_desc.fd_lens[0];
630 u32 crc, expected_crc;
631
632 WARN_ON(con->v2.in_kvecs[0].iov_len != ctrl_len);
633 WARN_ON(con->v2.in_kvecs[1].iov_len != CEPH_CRC_LEN);
634
635 crc = crc32c(-1, con->v2.in_kvecs[0].iov_base, ctrl_len);
636 expected_crc = get_unaligned_le32(con->v2.in_kvecs[1].iov_base);
637 if (crc != expected_crc) {
638 pr_err("bad control crc, calculated %u, expected %u\n",
639 crc, expected_crc);
640 return -EBADMSG;
641 }
642
643 return 0;
644 }
645
646 static int verify_epilogue_crcs(struct ceph_connection *con, u32 front_crc,
647 u32 middle_crc, u32 data_crc)
648 {
649 if (front_len(con->in_msg)) {
650 con->in_front_crc = crc32c(-1, con->in_msg->front.iov_base,
651 front_len(con->in_msg));
652 } else {
653 WARN_ON(!middle_len(con->in_msg) && !data_len(con->in_msg));
654 con->in_front_crc = -1;
655 }
656
657 if (middle_len(con->in_msg))
658 con->in_middle_crc = crc32c(-1,
659 con->in_msg->middle->vec.iov_base,
660 middle_len(con->in_msg));
661 else if (data_len(con->in_msg))
662 con->in_middle_crc = -1;
663 else
664 con->in_middle_crc = 0;
665
666 if (!data_len(con->in_msg))
667 con->in_data_crc = 0;
668
669 dout("%s con %p msg %p crcs %u %u %u\n", __func__, con, con->in_msg,
670 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
671
672 if (con->in_front_crc != front_crc) {
673 pr_err("bad front crc, calculated %u, expected %u\n",
674 con->in_front_crc, front_crc);
675 return -EBADMSG;
676 }
677 if (con->in_middle_crc != middle_crc) {
678 pr_err("bad middle crc, calculated %u, expected %u\n",
679 con->in_middle_crc, middle_crc);
680 return -EBADMSG;
681 }
682 if (con->in_data_crc != data_crc) {
683 pr_err("bad data crc, calculated %u, expected %u\n",
684 con->in_data_crc, data_crc);
685 return -EBADMSG;
686 }
687
688 return 0;
689 }
690
691 static int setup_crypto(struct ceph_connection *con,
692 u8 *session_key, int session_key_len,
693 u8 *con_secret, int con_secret_len)
694 {
695 unsigned int noio_flag;
696 void *p;
697 int ret;
698
699 dout("%s con %p con_mode %d session_key_len %d con_secret_len %d\n",
700 __func__, con, con->v2.con_mode, session_key_len, con_secret_len);
701 WARN_ON(con->v2.hmac_tfm || con->v2.gcm_tfm || con->v2.gcm_req);
702
703 if (con->v2.con_mode != CEPH_CON_MODE_CRC &&
704 con->v2.con_mode != CEPH_CON_MODE_SECURE) {
705 pr_err("bad con_mode %d\n", con->v2.con_mode);
706 return -EINVAL;
707 }
708
709 if (!session_key_len) {
710 WARN_ON(con->v2.con_mode != CEPH_CON_MODE_CRC);
711 WARN_ON(con_secret_len);
712 return 0; /* auth_none */
713 }
714
715 noio_flag = memalloc_noio_save();
716 con->v2.hmac_tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
717 memalloc_noio_restore(noio_flag);
718 if (IS_ERR(con->v2.hmac_tfm)) {
719 ret = PTR_ERR(con->v2.hmac_tfm);
720 con->v2.hmac_tfm = NULL;
721 pr_err("failed to allocate hmac tfm context: %d\n", ret);
722 return ret;
723 }
724
725 WARN_ON((unsigned long)session_key &
726 crypto_shash_alignmask(con->v2.hmac_tfm));
727 ret = crypto_shash_setkey(con->v2.hmac_tfm, session_key,
728 session_key_len);
729 if (ret) {
730 pr_err("failed to set hmac key: %d\n", ret);
731 return ret;
732 }
733
734 if (con->v2.con_mode == CEPH_CON_MODE_CRC) {
735 WARN_ON(con_secret_len);
736 return 0; /* auth_x, plain mode */
737 }
738
739 if (con_secret_len < CEPH_GCM_KEY_LEN + 2 * CEPH_GCM_IV_LEN) {
740 pr_err("con_secret too small %d\n", con_secret_len);
741 return -EINVAL;
742 }
743
744 noio_flag = memalloc_noio_save();
745 con->v2.gcm_tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
746 memalloc_noio_restore(noio_flag);
747 if (IS_ERR(con->v2.gcm_tfm)) {
748 ret = PTR_ERR(con->v2.gcm_tfm);
749 con->v2.gcm_tfm = NULL;
750 pr_err("failed to allocate gcm tfm context: %d\n", ret);
751 return ret;
752 }
753
754 p = con_secret;
755 WARN_ON((unsigned long)p & crypto_aead_alignmask(con->v2.gcm_tfm));
756 ret = crypto_aead_setkey(con->v2.gcm_tfm, p, CEPH_GCM_KEY_LEN);
757 if (ret) {
758 pr_err("failed to set gcm key: %d\n", ret);
759 return ret;
760 }
761
762 p += CEPH_GCM_KEY_LEN;
763 WARN_ON(crypto_aead_ivsize(con->v2.gcm_tfm) != CEPH_GCM_IV_LEN);
764 ret = crypto_aead_setauthsize(con->v2.gcm_tfm, CEPH_GCM_TAG_LEN);
765 if (ret) {
766 pr_err("failed to set gcm tag size: %d\n", ret);
767 return ret;
768 }
769
770 con->v2.gcm_req = aead_request_alloc(con->v2.gcm_tfm, GFP_NOIO);
771 if (!con->v2.gcm_req) {
772 pr_err("failed to allocate gcm request\n");
773 return -ENOMEM;
774 }
775
776 crypto_init_wait(&con->v2.gcm_wait);
777 aead_request_set_callback(con->v2.gcm_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
778 crypto_req_done, &con->v2.gcm_wait);
779
780 memcpy(&con->v2.in_gcm_nonce, p, CEPH_GCM_IV_LEN);
781 memcpy(&con->v2.out_gcm_nonce, p + CEPH_GCM_IV_LEN, CEPH_GCM_IV_LEN);
782 return 0; /* auth_x, secure mode */
783 }
784
785 static int hmac_sha256(struct ceph_connection *con, const struct kvec *kvecs,
786 int kvec_cnt, u8 *hmac)
787 {
788 SHASH_DESC_ON_STACK(desc, con->v2.hmac_tfm); /* tfm arg is ignored */
789 int ret;
790 int i;
791
792 dout("%s con %p hmac_tfm %p kvec_cnt %d\n", __func__, con,
793 con->v2.hmac_tfm, kvec_cnt);
794
795 if (!con->v2.hmac_tfm) {
796 memset(hmac, 0, SHA256_DIGEST_SIZE);
797 return 0; /* auth_none */
798 }
799
800 desc->tfm = con->v2.hmac_tfm;
801 ret = crypto_shash_init(desc);
802 if (ret)
803 return ret;
804
805 for (i = 0; i < kvec_cnt; i++) {
806 WARN_ON((unsigned long)kvecs[i].iov_base &
807 crypto_shash_alignmask(con->v2.hmac_tfm));
808 ret = crypto_shash_update(desc, kvecs[i].iov_base,
809 kvecs[i].iov_len);
810 if (ret)
811 return ret;
812 }
813
814 ret = crypto_shash_final(desc, hmac);
815 if (ret)
816 return ret;
817
818 shash_desc_zero(desc);
819 return 0; /* auth_x, both plain and secure modes */
820 }
821
822 static void gcm_inc_nonce(struct ceph_gcm_nonce *nonce)
823 {
824 u64 counter;
825
826 counter = le64_to_cpu(nonce->counter);
827 nonce->counter = cpu_to_le64(counter + 1);
828 }
829
830 static int gcm_crypt(struct ceph_connection *con, bool encrypt,
831 struct scatterlist *src, struct scatterlist *dst,
832 int src_len)
833 {
834 struct ceph_gcm_nonce *nonce;
835 int ret;
836
837 nonce = encrypt ? &con->v2.out_gcm_nonce : &con->v2.in_gcm_nonce;
838
839 aead_request_set_ad(con->v2.gcm_req, 0); /* no AAD */
840 aead_request_set_crypt(con->v2.gcm_req, src, dst, src_len, (u8 *)nonce);
841 ret = crypto_wait_req(encrypt ? crypto_aead_encrypt(con->v2.gcm_req) :
842 crypto_aead_decrypt(con->v2.gcm_req),
843 &con->v2.gcm_wait);
844 if (ret)
845 return ret;
846
847 gcm_inc_nonce(nonce);
848 return 0;
849 }
850
851 static void get_bvec_at(struct ceph_msg_data_cursor *cursor,
852 struct bio_vec *bv)
853 {
854 struct page *page;
855 size_t off, len;
856
857 WARN_ON(!cursor->total_resid);
858
859 /* skip zero-length data items */
860 while (!cursor->resid)
861 ceph_msg_data_advance(cursor, 0);
862
863 /* get a piece of data, cursor isn't advanced */
864 page = ceph_msg_data_next(cursor, &off, &len, NULL);
865
866 bv->bv_page = page;
867 bv->bv_offset = off;
868 bv->bv_len = len;
869 }
870
871 static int calc_sg_cnt(void *buf, int buf_len)
872 {
873 int sg_cnt;
874
875 if (!buf_len)
876 return 0;
877
878 sg_cnt = need_padding(buf_len) ? 1 : 0;
879 if (is_vmalloc_addr(buf)) {
880 WARN_ON(offset_in_page(buf));
881 sg_cnt += PAGE_ALIGN(buf_len) >> PAGE_SHIFT;
882 } else {
883 sg_cnt++;
884 }
885
886 return sg_cnt;
887 }
888
889 static int calc_sg_cnt_cursor(struct ceph_msg_data_cursor *cursor)
890 {
891 int data_len = cursor->total_resid;
892 struct bio_vec bv;
893 int sg_cnt;
894
895 if (!data_len)
896 return 0;
897
898 sg_cnt = need_padding(data_len) ? 1 : 0;
899 do {
900 get_bvec_at(cursor, &bv);
901 sg_cnt++;
902
903 ceph_msg_data_advance(cursor, bv.bv_len);
904 } while (cursor->total_resid);
905
906 return sg_cnt;
907 }
908
909 static void init_sgs(struct scatterlist **sg, void *buf, int buf_len, u8 *pad)
910 {
911 void *end = buf + buf_len;
912 struct page *page;
913 int len;
914 void *p;
915
916 if (!buf_len)
917 return;
918
919 if (is_vmalloc_addr(buf)) {
920 p = buf;
921 do {
922 page = vmalloc_to_page(p);
923 len = min_t(int, end - p, PAGE_SIZE);
924 WARN_ON(!page || !len || offset_in_page(p));
925 sg_set_page(*sg, page, len, 0);
926 *sg = sg_next(*sg);
927 p += len;
928 } while (p != end);
929 } else {
930 sg_set_buf(*sg, buf, buf_len);
931 *sg = sg_next(*sg);
932 }
933
934 if (need_padding(buf_len)) {
935 sg_set_buf(*sg, pad, padding_len(buf_len));
936 *sg = sg_next(*sg);
937 }
938 }
939
940 static void init_sgs_cursor(struct scatterlist **sg,
941 struct ceph_msg_data_cursor *cursor, u8 *pad)
942 {
943 int data_len = cursor->total_resid;
944 struct bio_vec bv;
945
946 if (!data_len)
947 return;
948
949 do {
950 get_bvec_at(cursor, &bv);
951 sg_set_page(*sg, bv.bv_page, bv.bv_len, bv.bv_offset);
952 *sg = sg_next(*sg);
953
954 ceph_msg_data_advance(cursor, bv.bv_len);
955 } while (cursor->total_resid);
956
957 if (need_padding(data_len)) {
958 sg_set_buf(*sg, pad, padding_len(data_len));
959 *sg = sg_next(*sg);
960 }
961 }
962
963 static int setup_message_sgs(struct sg_table *sgt, struct ceph_msg *msg,
964 u8 *front_pad, u8 *middle_pad, u8 *data_pad,
965 void *epilogue, bool add_tag)
966 {
967 struct ceph_msg_data_cursor cursor;
968 struct scatterlist *cur_sg;
969 int sg_cnt;
970 int ret;
971
972 if (!front_len(msg) && !middle_len(msg) && !data_len(msg))
973 return 0;
974
975 sg_cnt = 1; /* epilogue + [auth tag] */
976 if (front_len(msg))
977 sg_cnt += calc_sg_cnt(msg->front.iov_base,
978 front_len(msg));
979 if (middle_len(msg))
980 sg_cnt += calc_sg_cnt(msg->middle->vec.iov_base,
981 middle_len(msg));
982 if (data_len(msg)) {
983 ceph_msg_data_cursor_init(&cursor, msg, data_len(msg));
984 sg_cnt += calc_sg_cnt_cursor(&cursor);
985 }
986
987 ret = sg_alloc_table(sgt, sg_cnt, GFP_NOIO);
988 if (ret)
989 return ret;
990
991 cur_sg = sgt->sgl;
992 if (front_len(msg))
993 init_sgs(&cur_sg, msg->front.iov_base, front_len(msg),
994 front_pad);
995 if (middle_len(msg))
996 init_sgs(&cur_sg, msg->middle->vec.iov_base, middle_len(msg),
997 middle_pad);
998 if (data_len(msg)) {
999 ceph_msg_data_cursor_init(&cursor, msg, data_len(msg));
1000 init_sgs_cursor(&cur_sg, &cursor, data_pad);
1001 }
1002
1003 WARN_ON(!sg_is_last(cur_sg));
1004 sg_set_buf(cur_sg, epilogue,
1005 CEPH_GCM_BLOCK_LEN + (add_tag ? CEPH_GCM_TAG_LEN : 0));
1006 return 0;
1007 }
1008
1009 static int decrypt_preamble(struct ceph_connection *con)
1010 {
1011 struct scatterlist sg;
1012
1013 sg_init_one(&sg, con->v2.in_buf, CEPH_PREAMBLE_SECURE_LEN);
1014 return gcm_crypt(con, false, &sg, &sg, CEPH_PREAMBLE_SECURE_LEN);
1015 }
1016
1017 static int decrypt_control_remainder(struct ceph_connection *con)
1018 {
1019 int ctrl_len = con->v2.in_desc.fd_lens[0];
1020 int rem_len = ctrl_len - CEPH_PREAMBLE_INLINE_LEN;
1021 int pt_len = padding_len(rem_len) + CEPH_GCM_TAG_LEN;
1022 struct scatterlist sgs[2];
1023
1024 WARN_ON(con->v2.in_kvecs[0].iov_len != rem_len);
1025 WARN_ON(con->v2.in_kvecs[1].iov_len != pt_len);
1026
1027 sg_init_table(sgs, 2);
1028 sg_set_buf(&sgs[0], con->v2.in_kvecs[0].iov_base, rem_len);
1029 sg_set_buf(&sgs[1], con->v2.in_buf, pt_len);
1030
1031 return gcm_crypt(con, false, sgs, sgs,
1032 padded_len(rem_len) + CEPH_GCM_TAG_LEN);
1033 }
1034
1035 static int decrypt_message(struct ceph_connection *con)
1036 {
1037 struct sg_table sgt = {};
1038 int ret;
1039
1040 ret = setup_message_sgs(&sgt, con->in_msg, FRONT_PAD(con->v2.in_buf),
1041 MIDDLE_PAD(con->v2.in_buf), DATA_PAD(con->v2.in_buf),
1042 con->v2.in_buf, true);
1043 if (ret)
1044 goto out;
1045
1046 ret = gcm_crypt(con, false, sgt.sgl, sgt.sgl,
1047 tail_onwire_len(con->in_msg, true));
1048
1049 out:
1050 sg_free_table(&sgt);
1051 return ret;
1052 }
1053
1054 static int prepare_banner(struct ceph_connection *con)
1055 {
1056 int buf_len = CEPH_BANNER_V2_LEN + 2 + 8 + 8;
1057 void *buf, *p;
1058
1059 buf = alloc_conn_buf(con, buf_len);
1060 if (!buf)
1061 return -ENOMEM;
1062
1063 p = buf;
1064 ceph_encode_copy(&p, CEPH_BANNER_V2, CEPH_BANNER_V2_LEN);
1065 ceph_encode_16(&p, sizeof(u64) + sizeof(u64));
1066 ceph_encode_64(&p, CEPH_MSGR2_SUPPORTED_FEATURES);
1067 ceph_encode_64(&p, CEPH_MSGR2_REQUIRED_FEATURES);
1068 WARN_ON(p != buf + buf_len);
1069
1070 add_out_kvec(con, buf, buf_len);
1071 add_out_sign_kvec(con, buf, buf_len);
1072 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1073 return 0;
1074 }
1075
1076 /*
1077 * base:
1078 * preamble
1079 * control body (ctrl_len bytes)
1080 * space for control crc
1081 *
1082 * extdata (optional):
1083 * control body (extdata_len bytes)
1084 *
1085 * Compute control crc and gather base and extdata into:
1086 *
1087 * preamble
1088 * control body (ctrl_len + extdata_len bytes)
1089 * control crc
1090 *
1091 * Preamble should already be encoded at the start of base.
1092 */
1093 static void prepare_head_plain(struct ceph_connection *con, void *base,
1094 int ctrl_len, void *extdata, int extdata_len,
1095 bool to_be_signed)
1096 {
1097 int base_len = CEPH_PREAMBLE_LEN + ctrl_len + CEPH_CRC_LEN;
1098 void *crcp = base + base_len - CEPH_CRC_LEN;
1099 u32 crc;
1100
1101 crc = crc32c(-1, CTRL_BODY(base), ctrl_len);
1102 if (extdata_len)
1103 crc = crc32c(crc, extdata, extdata_len);
1104 put_unaligned_le32(crc, crcp);
1105
1106 if (!extdata_len) {
1107 add_out_kvec(con, base, base_len);
1108 if (to_be_signed)
1109 add_out_sign_kvec(con, base, base_len);
1110 return;
1111 }
1112
1113 add_out_kvec(con, base, crcp - base);
1114 add_out_kvec(con, extdata, extdata_len);
1115 add_out_kvec(con, crcp, CEPH_CRC_LEN);
1116 if (to_be_signed) {
1117 add_out_sign_kvec(con, base, crcp - base);
1118 add_out_sign_kvec(con, extdata, extdata_len);
1119 add_out_sign_kvec(con, crcp, CEPH_CRC_LEN);
1120 }
1121 }
1122
1123 static int prepare_head_secure_small(struct ceph_connection *con,
1124 void *base, int ctrl_len)
1125 {
1126 struct scatterlist sg;
1127 int ret;
1128
1129 /* inline buffer padding? */
1130 if (ctrl_len < CEPH_PREAMBLE_INLINE_LEN)
1131 memset(CTRL_BODY(base) + ctrl_len, 0,
1132 CEPH_PREAMBLE_INLINE_LEN - ctrl_len);
1133
1134 sg_init_one(&sg, base, CEPH_PREAMBLE_SECURE_LEN);
1135 ret = gcm_crypt(con, true, &sg, &sg,
1136 CEPH_PREAMBLE_SECURE_LEN - CEPH_GCM_TAG_LEN);
1137 if (ret)
1138 return ret;
1139
1140 add_out_kvec(con, base, CEPH_PREAMBLE_SECURE_LEN);
1141 return 0;
1142 }
1143
1144 /*
1145 * base:
1146 * preamble
1147 * control body (ctrl_len bytes)
1148 * space for padding, if needed
1149 * space for control remainder auth tag
1150 * space for preamble auth tag
1151 *
1152 * Encrypt preamble and the inline portion, then encrypt the remainder
1153 * and gather into:
1154 *
1155 * preamble
1156 * control body (48 bytes)
1157 * preamble auth tag
1158 * control body (ctrl_len - 48 bytes)
1159 * zero padding, if needed
1160 * control remainder auth tag
1161 *
1162 * Preamble should already be encoded at the start of base.
1163 */
1164 static int prepare_head_secure_big(struct ceph_connection *con,
1165 void *base, int ctrl_len)
1166 {
1167 int rem_len = ctrl_len - CEPH_PREAMBLE_INLINE_LEN;
1168 void *rem = CTRL_BODY(base) + CEPH_PREAMBLE_INLINE_LEN;
1169 void *rem_tag = rem + padded_len(rem_len);
1170 void *pmbl_tag = rem_tag + CEPH_GCM_TAG_LEN;
1171 struct scatterlist sgs[2];
1172 int ret;
1173
1174 sg_init_table(sgs, 2);
1175 sg_set_buf(&sgs[0], base, rem - base);
1176 sg_set_buf(&sgs[1], pmbl_tag, CEPH_GCM_TAG_LEN);
1177 ret = gcm_crypt(con, true, sgs, sgs, rem - base);
1178 if (ret)
1179 return ret;
1180
1181 /* control remainder padding? */
1182 if (need_padding(rem_len))
1183 memset(rem + rem_len, 0, padding_len(rem_len));
1184
1185 sg_init_one(&sgs[0], rem, pmbl_tag - rem);
1186 ret = gcm_crypt(con, true, sgs, sgs, rem_tag - rem);
1187 if (ret)
1188 return ret;
1189
1190 add_out_kvec(con, base, rem - base);
1191 add_out_kvec(con, pmbl_tag, CEPH_GCM_TAG_LEN);
1192 add_out_kvec(con, rem, pmbl_tag - rem);
1193 return 0;
1194 }
1195
1196 static int __prepare_control(struct ceph_connection *con, int tag,
1197 void *base, int ctrl_len, void *extdata,
1198 int extdata_len, bool to_be_signed)
1199 {
1200 int total_len = ctrl_len + extdata_len;
1201 struct ceph_frame_desc desc;
1202 int ret;
1203
1204 dout("%s con %p tag %d len %d (%d+%d)\n", __func__, con, tag,
1205 total_len, ctrl_len, extdata_len);
1206
1207 /* extdata may be vmalloc'ed but not base */
1208 if (WARN_ON(is_vmalloc_addr(base) || !ctrl_len))
1209 return -EINVAL;
1210
1211 init_frame_desc(&desc, tag, &total_len, 1);
1212 encode_preamble(&desc, base);
1213
1214 if (con_secure(con)) {
1215 if (WARN_ON(extdata_len || to_be_signed))
1216 return -EINVAL;
1217
1218 if (ctrl_len <= CEPH_PREAMBLE_INLINE_LEN)
1219 /* fully inlined, inline buffer may need padding */
1220 ret = prepare_head_secure_small(con, base, ctrl_len);
1221 else
1222 /* partially inlined, inline buffer is full */
1223 ret = prepare_head_secure_big(con, base, ctrl_len);
1224 if (ret)
1225 return ret;
1226 } else {
1227 prepare_head_plain(con, base, ctrl_len, extdata, extdata_len,
1228 to_be_signed);
1229 }
1230
1231 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1232 return 0;
1233 }
1234
1235 static int prepare_control(struct ceph_connection *con, int tag,
1236 void *base, int ctrl_len)
1237 {
1238 return __prepare_control(con, tag, base, ctrl_len, NULL, 0, false);
1239 }
1240
1241 static int prepare_hello(struct ceph_connection *con)
1242 {
1243 void *buf, *p;
1244 int ctrl_len;
1245
1246 ctrl_len = 1 + ceph_entity_addr_encoding_len(&con->peer_addr);
1247 buf = alloc_conn_buf(con, head_onwire_len(ctrl_len, false));
1248 if (!buf)
1249 return -ENOMEM;
1250
1251 p = CTRL_BODY(buf);
1252 ceph_encode_8(&p, CEPH_ENTITY_TYPE_CLIENT);
1253 ceph_encode_entity_addr(&p, &con->peer_addr);
1254 WARN_ON(p != CTRL_BODY(buf) + ctrl_len);
1255
1256 return __prepare_control(con, FRAME_TAG_HELLO, buf, ctrl_len,
1257 NULL, 0, true);
1258 }
1259
1260 /* so that head_onwire_len(AUTH_BUF_LEN, false) is 512 */
1261 #define AUTH_BUF_LEN (512 - CEPH_CRC_LEN - CEPH_PREAMBLE_PLAIN_LEN)
1262
1263 static int prepare_auth_request(struct ceph_connection *con)
1264 {
1265 void *authorizer, *authorizer_copy;
1266 int ctrl_len, authorizer_len;
1267 void *buf;
1268 int ret;
1269
1270 ctrl_len = AUTH_BUF_LEN;
1271 buf = alloc_conn_buf(con, head_onwire_len(ctrl_len, false));
1272 if (!buf)
1273 return -ENOMEM;
1274
1275 mutex_unlock(&con->mutex);
1276 ret = con->ops->get_auth_request(con, CTRL_BODY(buf), &ctrl_len,
1277 &authorizer, &authorizer_len);
1278 mutex_lock(&con->mutex);
1279 if (con->state != CEPH_CON_S_V2_HELLO) {
1280 dout("%s con %p state changed to %d\n", __func__, con,
1281 con->state);
1282 return -EAGAIN;
1283 }
1284
1285 dout("%s con %p get_auth_request ret %d\n", __func__, con, ret);
1286 if (ret)
1287 return ret;
1288
1289 authorizer_copy = alloc_conn_buf(con, authorizer_len);
1290 if (!authorizer_copy)
1291 return -ENOMEM;
1292
1293 memcpy(authorizer_copy, authorizer, authorizer_len);
1294
1295 return __prepare_control(con, FRAME_TAG_AUTH_REQUEST, buf, ctrl_len,
1296 authorizer_copy, authorizer_len, true);
1297 }
1298
1299 static int prepare_auth_request_more(struct ceph_connection *con,
1300 void *reply, int reply_len)
1301 {
1302 int ctrl_len, authorizer_len;
1303 void *authorizer;
1304 void *buf;
1305 int ret;
1306
1307 ctrl_len = AUTH_BUF_LEN;
1308 buf = alloc_conn_buf(con, head_onwire_len(ctrl_len, false));
1309 if (!buf)
1310 return -ENOMEM;
1311
1312 mutex_unlock(&con->mutex);
1313 ret = con->ops->handle_auth_reply_more(con, reply, reply_len,
1314 CTRL_BODY(buf), &ctrl_len,
1315 &authorizer, &authorizer_len);
1316 mutex_lock(&con->mutex);
1317 if (con->state != CEPH_CON_S_V2_AUTH) {
1318 dout("%s con %p state changed to %d\n", __func__, con,
1319 con->state);
1320 return -EAGAIN;
1321 }
1322
1323 dout("%s con %p handle_auth_reply_more ret %d\n", __func__, con, ret);
1324 if (ret)
1325 return ret;
1326
1327 return __prepare_control(con, FRAME_TAG_AUTH_REQUEST_MORE, buf,
1328 ctrl_len, authorizer, authorizer_len, true);
1329 }
1330
1331 static int prepare_auth_signature(struct ceph_connection *con)
1332 {
1333 void *buf;
1334 int ret;
1335
1336 buf = alloc_conn_buf(con, head_onwire_len(SHA256_DIGEST_SIZE,
1337 con_secure(con)));
1338 if (!buf)
1339 return -ENOMEM;
1340
1341 ret = hmac_sha256(con, con->v2.in_sign_kvecs, con->v2.in_sign_kvec_cnt,
1342 CTRL_BODY(buf));
1343 if (ret)
1344 return ret;
1345
1346 return prepare_control(con, FRAME_TAG_AUTH_SIGNATURE, buf,
1347 SHA256_DIGEST_SIZE);
1348 }
1349
1350 static int prepare_client_ident(struct ceph_connection *con)
1351 {
1352 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
1353 struct ceph_client *client = from_msgr(con->msgr);
1354 u64 global_id = ceph_client_gid(client);
1355 void *buf, *p;
1356 int ctrl_len;
1357
1358 WARN_ON(con->v2.server_cookie);
1359 WARN_ON(con->v2.connect_seq);
1360 WARN_ON(con->v2.peer_global_seq);
1361
1362 if (!con->v2.client_cookie) {
1363 do {
1364 get_random_bytes(&con->v2.client_cookie,
1365 sizeof(con->v2.client_cookie));
1366 } while (!con->v2.client_cookie);
1367 dout("%s con %p generated cookie 0x%llx\n", __func__, con,
1368 con->v2.client_cookie);
1369 } else {
1370 dout("%s con %p cookie already set 0x%llx\n", __func__, con,
1371 con->v2.client_cookie);
1372 }
1373
1374 dout("%s con %p my_addr %s/%u peer_addr %s/%u global_id %llu global_seq %llu features 0x%llx required_features 0x%llx cookie 0x%llx\n",
1375 __func__, con, ceph_pr_addr(my_addr), le32_to_cpu(my_addr->nonce),
1376 ceph_pr_addr(&con->peer_addr), le32_to_cpu(con->peer_addr.nonce),
1377 global_id, con->v2.global_seq, client->supported_features,
1378 client->required_features, con->v2.client_cookie);
1379
1380 ctrl_len = 1 + 4 + ceph_entity_addr_encoding_len(my_addr) +
1381 ceph_entity_addr_encoding_len(&con->peer_addr) + 6 * 8;
1382 buf = alloc_conn_buf(con, head_onwire_len(ctrl_len, con_secure(con)));
1383 if (!buf)
1384 return -ENOMEM;
1385
1386 p = CTRL_BODY(buf);
1387 ceph_encode_8(&p, 2); /* addrvec marker */
1388 ceph_encode_32(&p, 1); /* addr_cnt */
1389 ceph_encode_entity_addr(&p, my_addr);
1390 ceph_encode_entity_addr(&p, &con->peer_addr);
1391 ceph_encode_64(&p, global_id);
1392 ceph_encode_64(&p, con->v2.global_seq);
1393 ceph_encode_64(&p, client->supported_features);
1394 ceph_encode_64(&p, client->required_features);
1395 ceph_encode_64(&p, 0); /* flags */
1396 ceph_encode_64(&p, con->v2.client_cookie);
1397 WARN_ON(p != CTRL_BODY(buf) + ctrl_len);
1398
1399 return prepare_control(con, FRAME_TAG_CLIENT_IDENT, buf, ctrl_len);
1400 }
1401
1402 static int prepare_session_reconnect(struct ceph_connection *con)
1403 {
1404 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
1405 void *buf, *p;
1406 int ctrl_len;
1407
1408 WARN_ON(!con->v2.client_cookie);
1409 WARN_ON(!con->v2.server_cookie);
1410 WARN_ON(!con->v2.connect_seq);
1411 WARN_ON(!con->v2.peer_global_seq);
1412
1413 dout("%s con %p my_addr %s/%u client_cookie 0x%llx server_cookie 0x%llx global_seq %llu connect_seq %llu in_seq %llu\n",
1414 __func__, con, ceph_pr_addr(my_addr), le32_to_cpu(my_addr->nonce),
1415 con->v2.client_cookie, con->v2.server_cookie, con->v2.global_seq,
1416 con->v2.connect_seq, con->in_seq);
1417
1418 ctrl_len = 1 + 4 + ceph_entity_addr_encoding_len(my_addr) + 5 * 8;
1419 buf = alloc_conn_buf(con, head_onwire_len(ctrl_len, con_secure(con)));
1420 if (!buf)
1421 return -ENOMEM;
1422
1423 p = CTRL_BODY(buf);
1424 ceph_encode_8(&p, 2); /* entity_addrvec_t marker */
1425 ceph_encode_32(&p, 1); /* my_addrs len */
1426 ceph_encode_entity_addr(&p, my_addr);
1427 ceph_encode_64(&p, con->v2.client_cookie);
1428 ceph_encode_64(&p, con->v2.server_cookie);
1429 ceph_encode_64(&p, con->v2.global_seq);
1430 ceph_encode_64(&p, con->v2.connect_seq);
1431 ceph_encode_64(&p, con->in_seq);
1432 WARN_ON(p != CTRL_BODY(buf) + ctrl_len);
1433
1434 return prepare_control(con, FRAME_TAG_SESSION_RECONNECT, buf, ctrl_len);
1435 }
1436
1437 static int prepare_keepalive2(struct ceph_connection *con)
1438 {
1439 struct ceph_timespec *ts = CTRL_BODY(con->v2.out_buf);
1440 struct timespec64 now;
1441
1442 ktime_get_real_ts64(&now);
1443 dout("%s con %p timestamp %lld.%09ld\n", __func__, con, now.tv_sec,
1444 now.tv_nsec);
1445
1446 ceph_encode_timespec64(ts, &now);
1447
1448 reset_out_kvecs(con);
1449 return prepare_control(con, FRAME_TAG_KEEPALIVE2, con->v2.out_buf,
1450 sizeof(struct ceph_timespec));
1451 }
1452
1453 static int prepare_ack(struct ceph_connection *con)
1454 {
1455 void *p;
1456
1457 dout("%s con %p in_seq_acked %llu -> %llu\n", __func__, con,
1458 con->in_seq_acked, con->in_seq);
1459 con->in_seq_acked = con->in_seq;
1460
1461 p = CTRL_BODY(con->v2.out_buf);
1462 ceph_encode_64(&p, con->in_seq_acked);
1463
1464 reset_out_kvecs(con);
1465 return prepare_control(con, FRAME_TAG_ACK, con->v2.out_buf, 8);
1466 }
1467
1468 static void prepare_epilogue_plain(struct ceph_connection *con, bool aborted)
1469 {
1470 dout("%s con %p msg %p aborted %d crcs %u %u %u\n", __func__, con,
1471 con->out_msg, aborted, con->v2.out_epil.front_crc,
1472 con->v2.out_epil.middle_crc, con->v2.out_epil.data_crc);
1473
1474 encode_epilogue_plain(con, aborted);
1475 add_out_kvec(con, &con->v2.out_epil, CEPH_EPILOGUE_PLAIN_LEN);
1476 }
1477
1478 /*
1479 * For "used" empty segments, crc is -1. For unused (trailing)
1480 * segments, crc is 0.
1481 */
1482 static void prepare_message_plain(struct ceph_connection *con)
1483 {
1484 struct ceph_msg *msg = con->out_msg;
1485
1486 prepare_head_plain(con, con->v2.out_buf,
1487 sizeof(struct ceph_msg_header2), NULL, 0, false);
1488
1489 if (!front_len(msg) && !middle_len(msg)) {
1490 if (!data_len(msg)) {
1491 /*
1492 * Empty message: once the head is written,
1493 * we are done -- there is no epilogue.
1494 */
1495 con->v2.out_state = OUT_S_FINISH_MESSAGE;
1496 return;
1497 }
1498
1499 con->v2.out_epil.front_crc = -1;
1500 con->v2.out_epil.middle_crc = -1;
1501 con->v2.out_state = OUT_S_QUEUE_DATA;
1502 return;
1503 }
1504
1505 if (front_len(msg)) {
1506 con->v2.out_epil.front_crc = crc32c(-1, msg->front.iov_base,
1507 front_len(msg));
1508 add_out_kvec(con, msg->front.iov_base, front_len(msg));
1509 } else {
1510 /* middle (at least) is there, checked above */
1511 con->v2.out_epil.front_crc = -1;
1512 }
1513
1514 if (middle_len(msg)) {
1515 con->v2.out_epil.middle_crc =
1516 crc32c(-1, msg->middle->vec.iov_base, middle_len(msg));
1517 add_out_kvec(con, msg->middle->vec.iov_base, middle_len(msg));
1518 } else {
1519 con->v2.out_epil.middle_crc = data_len(msg) ? -1 : 0;
1520 }
1521
1522 if (data_len(msg)) {
1523 con->v2.out_state = OUT_S_QUEUE_DATA;
1524 } else {
1525 con->v2.out_epil.data_crc = 0;
1526 prepare_epilogue_plain(con, false);
1527 con->v2.out_state = OUT_S_FINISH_MESSAGE;
1528 }
1529 }
1530
1531 /*
1532 * Unfortunately the kernel crypto API doesn't support streaming
1533 * (piecewise) operation for AEAD algorithms, so we can't get away
1534 * with a fixed size buffer and a couple sgs. Instead, we have to
1535 * allocate pages for the entire tail of the message (currently up
1536 * to ~32M) and two sgs arrays (up to ~256K each)...
1537 */
1538 static int prepare_message_secure(struct ceph_connection *con)
1539 {
1540 void *zerop = page_address(ceph_zero_page);
1541 struct sg_table enc_sgt = {};
1542 struct sg_table sgt = {};
1543 struct page **enc_pages;
1544 int enc_page_cnt;
1545 int tail_len;
1546 int ret;
1547
1548 ret = prepare_head_secure_small(con, con->v2.out_buf,
1549 sizeof(struct ceph_msg_header2));
1550 if (ret)
1551 return ret;
1552
1553 tail_len = tail_onwire_len(con->out_msg, true);
1554 if (!tail_len) {
1555 /*
1556 * Empty message: once the head is written,
1557 * we are done -- there is no epilogue.
1558 */
1559 con->v2.out_state = OUT_S_FINISH_MESSAGE;
1560 return 0;
1561 }
1562
1563 encode_epilogue_secure(con, false);
1564 ret = setup_message_sgs(&sgt, con->out_msg, zerop, zerop, zerop,
1565 &con->v2.out_epil, false);
1566 if (ret)
1567 goto out;
1568
1569 enc_page_cnt = calc_pages_for(0, tail_len);
1570 enc_pages = ceph_alloc_page_vector(enc_page_cnt, GFP_NOIO);
1571 if (IS_ERR(enc_pages)) {
1572 ret = PTR_ERR(enc_pages);
1573 goto out;
1574 }
1575
1576 WARN_ON(con->v2.out_enc_pages || con->v2.out_enc_page_cnt);
1577 con->v2.out_enc_pages = enc_pages;
1578 con->v2.out_enc_page_cnt = enc_page_cnt;
1579 con->v2.out_enc_resid = tail_len;
1580 con->v2.out_enc_i = 0;
1581
1582 ret = sg_alloc_table_from_pages(&enc_sgt, enc_pages, enc_page_cnt,
1583 0, tail_len, GFP_NOIO);
1584 if (ret)
1585 goto out;
1586
1587 ret = gcm_crypt(con, true, sgt.sgl, enc_sgt.sgl,
1588 tail_len - CEPH_GCM_TAG_LEN);
1589 if (ret)
1590 goto out;
1591
1592 dout("%s con %p msg %p sg_cnt %d enc_page_cnt %d\n", __func__, con,
1593 con->out_msg, sgt.orig_nents, enc_page_cnt);
1594 con->v2.out_state = OUT_S_QUEUE_ENC_PAGE;
1595
1596 out:
1597 sg_free_table(&sgt);
1598 sg_free_table(&enc_sgt);
1599 return ret;
1600 }
1601
1602 static int prepare_message(struct ceph_connection *con)
1603 {
1604 int lens[] = {
1605 sizeof(struct ceph_msg_header2),
1606 front_len(con->out_msg),
1607 middle_len(con->out_msg),
1608 data_len(con->out_msg)
1609 };
1610 struct ceph_frame_desc desc;
1611 int ret;
1612
1613 dout("%s con %p msg %p logical %d+%d+%d+%d\n", __func__, con,
1614 con->out_msg, lens[0], lens[1], lens[2], lens[3]);
1615
1616 if (con->in_seq > con->in_seq_acked) {
1617 dout("%s con %p in_seq_acked %llu -> %llu\n", __func__, con,
1618 con->in_seq_acked, con->in_seq);
1619 con->in_seq_acked = con->in_seq;
1620 }
1621
1622 reset_out_kvecs(con);
1623 init_frame_desc(&desc, FRAME_TAG_MESSAGE, lens, 4);
1624 encode_preamble(&desc, con->v2.out_buf);
1625 fill_header2(CTRL_BODY(con->v2.out_buf), &con->out_msg->hdr,
1626 con->in_seq_acked);
1627
1628 if (con_secure(con)) {
1629 ret = prepare_message_secure(con);
1630 if (ret)
1631 return ret;
1632 } else {
1633 prepare_message_plain(con);
1634 }
1635
1636 ceph_con_flag_set(con, CEPH_CON_F_WRITE_PENDING);
1637 return 0;
1638 }
1639
1640 static int prepare_read_banner_prefix(struct ceph_connection *con)
1641 {
1642 void *buf;
1643
1644 buf = alloc_conn_buf(con, CEPH_BANNER_V2_PREFIX_LEN);
1645 if (!buf)
1646 return -ENOMEM;
1647
1648 reset_in_kvecs(con);
1649 add_in_kvec(con, buf, CEPH_BANNER_V2_PREFIX_LEN);
1650 add_in_sign_kvec(con, buf, CEPH_BANNER_V2_PREFIX_LEN);
1651 con->state = CEPH_CON_S_V2_BANNER_PREFIX;
1652 return 0;
1653 }
1654
1655 static int prepare_read_banner_payload(struct ceph_connection *con,
1656 int payload_len)
1657 {
1658 void *buf;
1659
1660 buf = alloc_conn_buf(con, payload_len);
1661 if (!buf)
1662 return -ENOMEM;
1663
1664 reset_in_kvecs(con);
1665 add_in_kvec(con, buf, payload_len);
1666 add_in_sign_kvec(con, buf, payload_len);
1667 con->state = CEPH_CON_S_V2_BANNER_PAYLOAD;
1668 return 0;
1669 }
1670
1671 static void prepare_read_preamble(struct ceph_connection *con)
1672 {
1673 reset_in_kvecs(con);
1674 add_in_kvec(con, con->v2.in_buf,
1675 con_secure(con) ? CEPH_PREAMBLE_SECURE_LEN :
1676 CEPH_PREAMBLE_PLAIN_LEN);
1677 con->v2.in_state = IN_S_HANDLE_PREAMBLE;
1678 }
1679
1680 static int prepare_read_control(struct ceph_connection *con)
1681 {
1682 int ctrl_len = con->v2.in_desc.fd_lens[0];
1683 int head_len;
1684 void *buf;
1685
1686 reset_in_kvecs(con);
1687 if (con->state == CEPH_CON_S_V2_HELLO ||
1688 con->state == CEPH_CON_S_V2_AUTH) {
1689 head_len = head_onwire_len(ctrl_len, false);
1690 buf = alloc_conn_buf(con, head_len);
1691 if (!buf)
1692 return -ENOMEM;
1693
1694 /* preserve preamble */
1695 memcpy(buf, con->v2.in_buf, CEPH_PREAMBLE_LEN);
1696
1697 add_in_kvec(con, CTRL_BODY(buf), ctrl_len);
1698 add_in_kvec(con, CTRL_BODY(buf) + ctrl_len, CEPH_CRC_LEN);
1699 add_in_sign_kvec(con, buf, head_len);
1700 } else {
1701 if (ctrl_len > CEPH_PREAMBLE_INLINE_LEN) {
1702 buf = alloc_conn_buf(con, ctrl_len);
1703 if (!buf)
1704 return -ENOMEM;
1705
1706 add_in_kvec(con, buf, ctrl_len);
1707 } else {
1708 add_in_kvec(con, CTRL_BODY(con->v2.in_buf), ctrl_len);
1709 }
1710 add_in_kvec(con, con->v2.in_buf, CEPH_CRC_LEN);
1711 }
1712 con->v2.in_state = IN_S_HANDLE_CONTROL;
1713 return 0;
1714 }
1715
1716 static int prepare_read_control_remainder(struct ceph_connection *con)
1717 {
1718 int ctrl_len = con->v2.in_desc.fd_lens[0];
1719 int rem_len = ctrl_len - CEPH_PREAMBLE_INLINE_LEN;
1720 void *buf;
1721
1722 buf = alloc_conn_buf(con, ctrl_len);
1723 if (!buf)
1724 return -ENOMEM;
1725
1726 memcpy(buf, CTRL_BODY(con->v2.in_buf), CEPH_PREAMBLE_INLINE_LEN);
1727
1728 reset_in_kvecs(con);
1729 add_in_kvec(con, buf + CEPH_PREAMBLE_INLINE_LEN, rem_len);
1730 add_in_kvec(con, con->v2.in_buf,
1731 padding_len(rem_len) + CEPH_GCM_TAG_LEN);
1732 con->v2.in_state = IN_S_HANDLE_CONTROL_REMAINDER;
1733 return 0;
1734 }
1735
1736 static void prepare_read_data(struct ceph_connection *con)
1737 {
1738 struct bio_vec bv;
1739
1740 if (!con_secure(con))
1741 con->in_data_crc = -1;
1742 ceph_msg_data_cursor_init(&con->v2.in_cursor, con->in_msg,
1743 data_len(con->in_msg));
1744
1745 get_bvec_at(&con->v2.in_cursor, &bv);
1746 set_in_bvec(con, &bv);
1747 con->v2.in_state = IN_S_PREPARE_READ_DATA_CONT;
1748 }
1749
1750 static void prepare_read_data_cont(struct ceph_connection *con)
1751 {
1752 struct bio_vec bv;
1753
1754 if (!con_secure(con))
1755 con->in_data_crc = ceph_crc32c_page(con->in_data_crc,
1756 con->v2.in_bvec.bv_page,
1757 con->v2.in_bvec.bv_offset,
1758 con->v2.in_bvec.bv_len);
1759
1760 ceph_msg_data_advance(&con->v2.in_cursor, con->v2.in_bvec.bv_len);
1761 if (con->v2.in_cursor.total_resid) {
1762 get_bvec_at(&con->v2.in_cursor, &bv);
1763 set_in_bvec(con, &bv);
1764 WARN_ON(con->v2.in_state != IN_S_PREPARE_READ_DATA_CONT);
1765 return;
1766 }
1767
1768 /*
1769 * We've read all data. Prepare to read data padding (if any)
1770 * and epilogue.
1771 */
1772 reset_in_kvecs(con);
1773 if (con_secure(con)) {
1774 if (need_padding(data_len(con->in_msg)))
1775 add_in_kvec(con, DATA_PAD(con->v2.in_buf),
1776 padding_len(data_len(con->in_msg)));
1777 add_in_kvec(con, con->v2.in_buf, CEPH_EPILOGUE_SECURE_LEN);
1778 } else {
1779 add_in_kvec(con, con->v2.in_buf, CEPH_EPILOGUE_PLAIN_LEN);
1780 }
1781 con->v2.in_state = IN_S_HANDLE_EPILOGUE;
1782 }
1783
1784 static void __finish_skip(struct ceph_connection *con)
1785 {
1786 con->in_seq++;
1787 prepare_read_preamble(con);
1788 }
1789
1790 static void prepare_skip_message(struct ceph_connection *con)
1791 {
1792 struct ceph_frame_desc *desc = &con->v2.in_desc;
1793 int tail_len;
1794
1795 dout("%s con %p %d+%d+%d\n", __func__, con, desc->fd_lens[1],
1796 desc->fd_lens[2], desc->fd_lens[3]);
1797
1798 tail_len = __tail_onwire_len(desc->fd_lens[1], desc->fd_lens[2],
1799 desc->fd_lens[3], con_secure(con));
1800 if (!tail_len) {
1801 __finish_skip(con);
1802 } else {
1803 set_in_skip(con, tail_len);
1804 con->v2.in_state = IN_S_FINISH_SKIP;
1805 }
1806 }
1807
1808 static int process_banner_prefix(struct ceph_connection *con)
1809 {
1810 int payload_len;
1811 void *p;
1812
1813 WARN_ON(con->v2.in_kvecs[0].iov_len != CEPH_BANNER_V2_PREFIX_LEN);
1814
1815 p = con->v2.in_kvecs[0].iov_base;
1816 if (memcmp(p, CEPH_BANNER_V2, CEPH_BANNER_V2_LEN)) {
1817 if (!memcmp(p, CEPH_BANNER, CEPH_BANNER_LEN))
1818 con->error_msg = "server is speaking msgr1 protocol";
1819 else
1820 con->error_msg = "protocol error, bad banner";
1821 return -EINVAL;
1822 }
1823
1824 p += CEPH_BANNER_V2_LEN;
1825 payload_len = ceph_decode_16(&p);
1826 dout("%s con %p payload_len %d\n", __func__, con, payload_len);
1827
1828 return prepare_read_banner_payload(con, payload_len);
1829 }
1830
1831 static int process_banner_payload(struct ceph_connection *con)
1832 {
1833 void *end = con->v2.in_kvecs[0].iov_base + con->v2.in_kvecs[0].iov_len;
1834 u64 feat = CEPH_MSGR2_SUPPORTED_FEATURES;
1835 u64 req_feat = CEPH_MSGR2_REQUIRED_FEATURES;
1836 u64 server_feat, server_req_feat;
1837 void *p;
1838 int ret;
1839
1840 p = con->v2.in_kvecs[0].iov_base;
1841 ceph_decode_64_safe(&p, end, server_feat, bad);
1842 ceph_decode_64_safe(&p, end, server_req_feat, bad);
1843
1844 dout("%s con %p server_feat 0x%llx server_req_feat 0x%llx\n",
1845 __func__, con, server_feat, server_req_feat);
1846
1847 if (req_feat & ~server_feat) {
1848 pr_err("msgr2 feature set mismatch: my required > server's supported 0x%llx, need 0x%llx\n",
1849 server_feat, req_feat & ~server_feat);
1850 con->error_msg = "missing required protocol features";
1851 return -EINVAL;
1852 }
1853 if (server_req_feat & ~feat) {
1854 pr_err("msgr2 feature set mismatch: server's required > my supported 0x%llx, missing 0x%llx\n",
1855 feat, server_req_feat & ~feat);
1856 con->error_msg = "missing required protocol features";
1857 return -EINVAL;
1858 }
1859
1860 /* no reset_out_kvecs() as our banner may still be pending */
1861 ret = prepare_hello(con);
1862 if (ret) {
1863 pr_err("prepare_hello failed: %d\n", ret);
1864 return ret;
1865 }
1866
1867 con->state = CEPH_CON_S_V2_HELLO;
1868 prepare_read_preamble(con);
1869 return 0;
1870
1871 bad:
1872 pr_err("failed to decode banner payload\n");
1873 return -EINVAL;
1874 }
1875
1876 static int process_hello(struct ceph_connection *con, void *p, void *end)
1877 {
1878 struct ceph_entity_addr *my_addr = &con->msgr->inst.addr;
1879 struct ceph_entity_addr addr_for_me;
1880 u8 entity_type;
1881 int ret;
1882
1883 if (con->state != CEPH_CON_S_V2_HELLO) {
1884 con->error_msg = "protocol error, unexpected hello";
1885 return -EINVAL;
1886 }
1887
1888 ceph_decode_8_safe(&p, end, entity_type, bad);
1889 ret = ceph_decode_entity_addr(&p, end, &addr_for_me);
1890 if (ret) {
1891 pr_err("failed to decode addr_for_me: %d\n", ret);
1892 return ret;
1893 }
1894
1895 dout("%s con %p entity_type %d addr_for_me %s\n", __func__, con,
1896 entity_type, ceph_pr_addr(&addr_for_me));
1897
1898 if (entity_type != con->peer_name.type) {
1899 pr_err("bad peer type, want %d, got %d\n",
1900 con->peer_name.type, entity_type);
1901 con->error_msg = "wrong peer at address";
1902 return -EINVAL;
1903 }
1904
1905 /*
1906 * Set our address to the address our first peer (i.e. monitor)
1907 * sees that we are connecting from. If we are behind some sort
1908 * of NAT and want to be identified by some private (not NATed)
1909 * address, ip option should be used.
1910 */
1911 if (ceph_addr_is_blank(my_addr)) {
1912 memcpy(&my_addr->in_addr, &addr_for_me.in_addr,
1913 sizeof(my_addr->in_addr));
1914 ceph_addr_set_port(my_addr, 0);
1915 dout("%s con %p set my addr %s, as seen by peer %s\n",
1916 __func__, con, ceph_pr_addr(my_addr),
1917 ceph_pr_addr(&con->peer_addr));
1918 } else {
1919 dout("%s con %p my addr already set %s\n",
1920 __func__, con, ceph_pr_addr(my_addr));
1921 }
1922
1923 WARN_ON(ceph_addr_is_blank(my_addr) || ceph_addr_port(my_addr));
1924 WARN_ON(my_addr->type != CEPH_ENTITY_ADDR_TYPE_ANY);
1925 WARN_ON(!my_addr->nonce);
1926
1927 /* no reset_out_kvecs() as our hello may still be pending */
1928 ret = prepare_auth_request(con);
1929 if (ret) {
1930 if (ret != -EAGAIN)
1931 pr_err("prepare_auth_request failed: %d\n", ret);
1932 return ret;
1933 }
1934
1935 con->state = CEPH_CON_S_V2_AUTH;
1936 return 0;
1937
1938 bad:
1939 pr_err("failed to decode hello\n");
1940 return -EINVAL;
1941 }
1942
1943 static int process_auth_bad_method(struct ceph_connection *con,
1944 void *p, void *end)
1945 {
1946 int allowed_protos[8], allowed_modes[8];
1947 int allowed_proto_cnt, allowed_mode_cnt;
1948 int used_proto, result;
1949 int ret;
1950 int i;
1951
1952 if (con->state != CEPH_CON_S_V2_AUTH) {
1953 con->error_msg = "protocol error, unexpected auth_bad_method";
1954 return -EINVAL;
1955 }
1956
1957 ceph_decode_32_safe(&p, end, used_proto, bad);
1958 ceph_decode_32_safe(&p, end, result, bad);
1959 dout("%s con %p used_proto %d result %d\n", __func__, con, used_proto,
1960 result);
1961
1962 ceph_decode_32_safe(&p, end, allowed_proto_cnt, bad);
1963 if (allowed_proto_cnt > ARRAY_SIZE(allowed_protos)) {
1964 pr_err("allowed_protos too big %d\n", allowed_proto_cnt);
1965 return -EINVAL;
1966 }
1967 for (i = 0; i < allowed_proto_cnt; i++) {
1968 ceph_decode_32_safe(&p, end, allowed_protos[i], bad);
1969 dout("%s con %p allowed_protos[%d] %d\n", __func__, con,
1970 i, allowed_protos[i]);
1971 }
1972
1973 ceph_decode_32_safe(&p, end, allowed_mode_cnt, bad);
1974 if (allowed_mode_cnt > ARRAY_SIZE(allowed_modes)) {
1975 pr_err("allowed_modes too big %d\n", allowed_mode_cnt);
1976 return -EINVAL;
1977 }
1978 for (i = 0; i < allowed_mode_cnt; i++) {
1979 ceph_decode_32_safe(&p, end, allowed_modes[i], bad);
1980 dout("%s con %p allowed_modes[%d] %d\n", __func__, con,
1981 i, allowed_modes[i]);
1982 }
1983
1984 mutex_unlock(&con->mutex);
1985 ret = con->ops->handle_auth_bad_method(con, used_proto, result,
1986 allowed_protos,
1987 allowed_proto_cnt,
1988 allowed_modes,
1989 allowed_mode_cnt);
1990 mutex_lock(&con->mutex);
1991 if (con->state != CEPH_CON_S_V2_AUTH) {
1992 dout("%s con %p state changed to %d\n", __func__, con,
1993 con->state);
1994 return -EAGAIN;
1995 }
1996
1997 dout("%s con %p handle_auth_bad_method ret %d\n", __func__, con, ret);
1998 return ret;
1999
2000 bad:
2001 pr_err("failed to decode auth_bad_method\n");
2002 return -EINVAL;
2003 }
2004
2005 static int process_auth_reply_more(struct ceph_connection *con,
2006 void *p, void *end)
2007 {
2008 int payload_len;
2009 int ret;
2010
2011 if (con->state != CEPH_CON_S_V2_AUTH) {
2012 con->error_msg = "protocol error, unexpected auth_reply_more";
2013 return -EINVAL;
2014 }
2015
2016 ceph_decode_32_safe(&p, end, payload_len, bad);
2017 ceph_decode_need(&p, end, payload_len, bad);
2018
2019 dout("%s con %p payload_len %d\n", __func__, con, payload_len);
2020
2021 reset_out_kvecs(con);
2022 ret = prepare_auth_request_more(con, p, payload_len);
2023 if (ret) {
2024 if (ret != -EAGAIN)
2025 pr_err("prepare_auth_request_more failed: %d\n", ret);
2026 return ret;
2027 }
2028
2029 return 0;
2030
2031 bad:
2032 pr_err("failed to decode auth_reply_more\n");
2033 return -EINVAL;
2034 }
2035
2036 /*
2037 * Align session_key and con_secret to avoid GFP_ATOMIC allocation
2038 * inside crypto_shash_setkey() and crypto_aead_setkey() called from
2039 * setup_crypto(). __aligned(16) isn't guaranteed to work for stack
2040 * objects, so do it by hand.
2041 */
2042 static int process_auth_done(struct ceph_connection *con, void *p, void *end)
2043 {
2044 u8 session_key_buf[CEPH_KEY_LEN + 16];
2045 u8 con_secret_buf[CEPH_MAX_CON_SECRET_LEN + 16];
2046 u8 *session_key = PTR_ALIGN(&session_key_buf[0], 16);
2047 u8 *con_secret = PTR_ALIGN(&con_secret_buf[0], 16);
2048 int session_key_len, con_secret_len;
2049 int payload_len;
2050 u64 global_id;
2051 int ret;
2052
2053 if (con->state != CEPH_CON_S_V2_AUTH) {
2054 con->error_msg = "protocol error, unexpected auth_done";
2055 return -EINVAL;
2056 }
2057
2058 ceph_decode_64_safe(&p, end, global_id, bad);
2059 ceph_decode_32_safe(&p, end, con->v2.con_mode, bad);
2060 ceph_decode_32_safe(&p, end, payload_len, bad);
2061
2062 dout("%s con %p global_id %llu con_mode %d payload_len %d\n",
2063 __func__, con, global_id, con->v2.con_mode, payload_len);
2064
2065 mutex_unlock(&con->mutex);
2066 session_key_len = 0;
2067 con_secret_len = 0;
2068 ret = con->ops->handle_auth_done(con, global_id, p, payload_len,
2069 session_key, &session_key_len,
2070 con_secret, &con_secret_len);
2071 mutex_lock(&con->mutex);
2072 if (con->state != CEPH_CON_S_V2_AUTH) {
2073 dout("%s con %p state changed to %d\n", __func__, con,
2074 con->state);
2075 return -EAGAIN;
2076 }
2077
2078 dout("%s con %p handle_auth_done ret %d\n", __func__, con, ret);
2079 if (ret)
2080 return ret;
2081
2082 ret = setup_crypto(con, session_key, session_key_len, con_secret,
2083 con_secret_len);
2084 if (ret)
2085 return ret;
2086
2087 reset_out_kvecs(con);
2088 ret = prepare_auth_signature(con);
2089 if (ret) {
2090 pr_err("prepare_auth_signature failed: %d\n", ret);
2091 return ret;
2092 }
2093
2094 con->state = CEPH_CON_S_V2_AUTH_SIGNATURE;
2095 return 0;
2096
2097 bad:
2098 pr_err("failed to decode auth_done\n");
2099 return -EINVAL;
2100 }
2101
2102 static int process_auth_signature(struct ceph_connection *con,
2103 void *p, void *end)
2104 {
2105 u8 hmac[SHA256_DIGEST_SIZE];
2106 int ret;
2107
2108 if (con->state != CEPH_CON_S_V2_AUTH_SIGNATURE) {
2109 con->error_msg = "protocol error, unexpected auth_signature";
2110 return -EINVAL;
2111 }
2112
2113 ret = hmac_sha256(con, con->v2.out_sign_kvecs,
2114 con->v2.out_sign_kvec_cnt, hmac);
2115 if (ret)
2116 return ret;
2117
2118 ceph_decode_need(&p, end, SHA256_DIGEST_SIZE, bad);
2119 if (crypto_memneq(p, hmac, SHA256_DIGEST_SIZE)) {
2120 con->error_msg = "integrity error, bad auth signature";
2121 return -EBADMSG;
2122 }
2123
2124 dout("%s con %p auth signature ok\n", __func__, con);
2125
2126 /* no reset_out_kvecs() as our auth_signature may still be pending */
2127 if (!con->v2.server_cookie) {
2128 ret = prepare_client_ident(con);
2129 if (ret) {
2130 pr_err("prepare_client_ident failed: %d\n", ret);
2131 return ret;
2132 }
2133
2134 con->state = CEPH_CON_S_V2_SESSION_CONNECT;
2135 } else {
2136 ret = prepare_session_reconnect(con);
2137 if (ret) {
2138 pr_err("prepare_session_reconnect failed: %d\n", ret);
2139 return ret;
2140 }
2141
2142 con->state = CEPH_CON_S_V2_SESSION_RECONNECT;
2143 }
2144
2145 return 0;
2146
2147 bad:
2148 pr_err("failed to decode auth_signature\n");
2149 return -EINVAL;
2150 }
2151
2152 static int process_server_ident(struct ceph_connection *con,
2153 void *p, void *end)
2154 {
2155 struct ceph_client *client = from_msgr(con->msgr);
2156 u64 features, required_features;
2157 struct ceph_entity_addr addr;
2158 u64 global_seq;
2159 u64 global_id;
2160 u64 cookie;
2161 u64 flags;
2162 int ret;
2163
2164 if (con->state != CEPH_CON_S_V2_SESSION_CONNECT) {
2165 con->error_msg = "protocol error, unexpected server_ident";
2166 return -EINVAL;
2167 }
2168
2169 ret = ceph_decode_entity_addrvec(&p, end, true, &addr);
2170 if (ret) {
2171 pr_err("failed to decode server addrs: %d\n", ret);
2172 return ret;
2173 }
2174
2175 ceph_decode_64_safe(&p, end, global_id, bad);
2176 ceph_decode_64_safe(&p, end, global_seq, bad);
2177 ceph_decode_64_safe(&p, end, features, bad);
2178 ceph_decode_64_safe(&p, end, required_features, bad);
2179 ceph_decode_64_safe(&p, end, flags, bad);
2180 ceph_decode_64_safe(&p, end, cookie, bad);
2181
2182 dout("%s con %p addr %s/%u global_id %llu global_seq %llu features 0x%llx required_features 0x%llx flags 0x%llx cookie 0x%llx\n",
2183 __func__, con, ceph_pr_addr(&addr), le32_to_cpu(addr.nonce),
2184 global_id, global_seq, features, required_features, flags, cookie);
2185
2186 /* is this who we intended to talk to? */
2187 if (memcmp(&addr, &con->peer_addr, sizeof(con->peer_addr))) {
2188 pr_err("bad peer addr/nonce, want %s/%u, got %s/%u\n",
2189 ceph_pr_addr(&con->peer_addr),
2190 le32_to_cpu(con->peer_addr.nonce),
2191 ceph_pr_addr(&addr), le32_to_cpu(addr.nonce));
2192 con->error_msg = "wrong peer at address";
2193 return -EINVAL;
2194 }
2195
2196 if (client->required_features & ~features) {
2197 pr_err("RADOS feature set mismatch: my required > server's supported 0x%llx, need 0x%llx\n",
2198 features, client->required_features & ~features);
2199 con->error_msg = "missing required protocol features";
2200 return -EINVAL;
2201 }
2202
2203 /*
2204 * Both name->type and name->num are set in ceph_con_open() but
2205 * name->num may be bogus in the initial monmap. name->type is
2206 * verified in handle_hello().
2207 */
2208 WARN_ON(!con->peer_name.type);
2209 con->peer_name.num = cpu_to_le64(global_id);
2210 con->v2.peer_global_seq = global_seq;
2211 con->peer_features = features;
2212 WARN_ON(required_features & ~client->supported_features);
2213 con->v2.server_cookie = cookie;
2214
2215 if (flags & CEPH_MSG_CONNECT_LOSSY) {
2216 ceph_con_flag_set(con, CEPH_CON_F_LOSSYTX);
2217 WARN_ON(con->v2.server_cookie);
2218 } else {
2219 WARN_ON(!con->v2.server_cookie);
2220 }
2221
2222 clear_in_sign_kvecs(con);
2223 clear_out_sign_kvecs(con);
2224 free_conn_bufs(con);
2225 con->delay = 0; /* reset backoff memory */
2226
2227 con->state = CEPH_CON_S_OPEN;
2228 con->v2.out_state = OUT_S_GET_NEXT;
2229 return 0;
2230
2231 bad:
2232 pr_err("failed to decode server_ident\n");
2233 return -EINVAL;
2234 }
2235
2236 static int process_ident_missing_features(struct ceph_connection *con,
2237 void *p, void *end)
2238 {
2239 struct ceph_client *client = from_msgr(con->msgr);
2240 u64 missing_features;
2241
2242 if (con->state != CEPH_CON_S_V2_SESSION_CONNECT) {
2243 con->error_msg = "protocol error, unexpected ident_missing_features";
2244 return -EINVAL;
2245 }
2246
2247 ceph_decode_64_safe(&p, end, missing_features, bad);
2248 pr_err("RADOS feature set mismatch: server's required > my supported 0x%llx, missing 0x%llx\n",
2249 client->supported_features, missing_features);
2250 con->error_msg = "missing required protocol features";
2251 return -EINVAL;
2252
2253 bad:
2254 pr_err("failed to decode ident_missing_features\n");
2255 return -EINVAL;
2256 }
2257
2258 static int process_session_reconnect_ok(struct ceph_connection *con,
2259 void *p, void *end)
2260 {
2261 u64 seq;
2262
2263 if (con->state != CEPH_CON_S_V2_SESSION_RECONNECT) {
2264 con->error_msg = "protocol error, unexpected session_reconnect_ok";
2265 return -EINVAL;
2266 }
2267
2268 ceph_decode_64_safe(&p, end, seq, bad);
2269
2270 dout("%s con %p seq %llu\n", __func__, con, seq);
2271 ceph_con_discard_requeued(con, seq);
2272
2273 clear_in_sign_kvecs(con);
2274 clear_out_sign_kvecs(con);
2275 free_conn_bufs(con);
2276 con->delay = 0; /* reset backoff memory */
2277
2278 con->state = CEPH_CON_S_OPEN;
2279 con->v2.out_state = OUT_S_GET_NEXT;
2280 return 0;
2281
2282 bad:
2283 pr_err("failed to decode session_reconnect_ok\n");
2284 return -EINVAL;
2285 }
2286
2287 static int process_session_retry(struct ceph_connection *con,
2288 void *p, void *end)
2289 {
2290 u64 connect_seq;
2291 int ret;
2292
2293 if (con->state != CEPH_CON_S_V2_SESSION_RECONNECT) {
2294 con->error_msg = "protocol error, unexpected session_retry";
2295 return -EINVAL;
2296 }
2297
2298 ceph_decode_64_safe(&p, end, connect_seq, bad);
2299
2300 dout("%s con %p connect_seq %llu\n", __func__, con, connect_seq);
2301 WARN_ON(connect_seq <= con->v2.connect_seq);
2302 con->v2.connect_seq = connect_seq + 1;
2303
2304 free_conn_bufs(con);
2305
2306 reset_out_kvecs(con);
2307 ret = prepare_session_reconnect(con);
2308 if (ret) {
2309 pr_err("prepare_session_reconnect (cseq) failed: %d\n", ret);
2310 return ret;
2311 }
2312
2313 return 0;
2314
2315 bad:
2316 pr_err("failed to decode session_retry\n");
2317 return -EINVAL;
2318 }
2319
2320 static int process_session_retry_global(struct ceph_connection *con,
2321 void *p, void *end)
2322 {
2323 u64 global_seq;
2324 int ret;
2325
2326 if (con->state != CEPH_CON_S_V2_SESSION_RECONNECT) {
2327 con->error_msg = "protocol error, unexpected session_retry_global";
2328 return -EINVAL;
2329 }
2330
2331 ceph_decode_64_safe(&p, end, global_seq, bad);
2332
2333 dout("%s con %p global_seq %llu\n", __func__, con, global_seq);
2334 WARN_ON(global_seq <= con->v2.global_seq);
2335 con->v2.global_seq = ceph_get_global_seq(con->msgr, global_seq);
2336
2337 free_conn_bufs(con);
2338
2339 reset_out_kvecs(con);
2340 ret = prepare_session_reconnect(con);
2341 if (ret) {
2342 pr_err("prepare_session_reconnect (gseq) failed: %d\n", ret);
2343 return ret;
2344 }
2345
2346 return 0;
2347
2348 bad:
2349 pr_err("failed to decode session_retry_global\n");
2350 return -EINVAL;
2351 }
2352
2353 static int process_session_reset(struct ceph_connection *con,
2354 void *p, void *end)
2355 {
2356 bool full;
2357 int ret;
2358
2359 if (con->state != CEPH_CON_S_V2_SESSION_RECONNECT) {
2360 con->error_msg = "protocol error, unexpected session_reset";
2361 return -EINVAL;
2362 }
2363
2364 ceph_decode_8_safe(&p, end, full, bad);
2365 if (!full) {
2366 con->error_msg = "protocol error, bad session_reset";
2367 return -EINVAL;
2368 }
2369
2370 pr_info("%s%lld %s session reset\n", ENTITY_NAME(con->peer_name),
2371 ceph_pr_addr(&con->peer_addr));
2372 ceph_con_reset_session(con);
2373
2374 mutex_unlock(&con->mutex);
2375 if (con->ops->peer_reset)
2376 con->ops->peer_reset(con);
2377 mutex_lock(&con->mutex);
2378 if (con->state != CEPH_CON_S_V2_SESSION_RECONNECT) {
2379 dout("%s con %p state changed to %d\n", __func__, con,
2380 con->state);
2381 return -EAGAIN;
2382 }
2383
2384 free_conn_bufs(con);
2385
2386 reset_out_kvecs(con);
2387 ret = prepare_client_ident(con);
2388 if (ret) {
2389 pr_err("prepare_client_ident (rst) failed: %d\n", ret);
2390 return ret;
2391 }
2392
2393 con->state = CEPH_CON_S_V2_SESSION_CONNECT;
2394 return 0;
2395
2396 bad:
2397 pr_err("failed to decode session_reset\n");
2398 return -EINVAL;
2399 }
2400
2401 static int process_keepalive2_ack(struct ceph_connection *con,
2402 void *p, void *end)
2403 {
2404 if (con->state != CEPH_CON_S_OPEN) {
2405 con->error_msg = "protocol error, unexpected keepalive2_ack";
2406 return -EINVAL;
2407 }
2408
2409 ceph_decode_need(&p, end, sizeof(struct ceph_timespec), bad);
2410 ceph_decode_timespec64(&con->last_keepalive_ack, p);
2411
2412 dout("%s con %p timestamp %lld.%09ld\n", __func__, con,
2413 con->last_keepalive_ack.tv_sec, con->last_keepalive_ack.tv_nsec);
2414
2415 return 0;
2416
2417 bad:
2418 pr_err("failed to decode keepalive2_ack\n");
2419 return -EINVAL;
2420 }
2421
2422 static int process_ack(struct ceph_connection *con, void *p, void *end)
2423 {
2424 u64 seq;
2425
2426 if (con->state != CEPH_CON_S_OPEN) {
2427 con->error_msg = "protocol error, unexpected ack";
2428 return -EINVAL;
2429 }
2430
2431 ceph_decode_64_safe(&p, end, seq, bad);
2432
2433 dout("%s con %p seq %llu\n", __func__, con, seq);
2434 ceph_con_discard_sent(con, seq);
2435 return 0;
2436
2437 bad:
2438 pr_err("failed to decode ack\n");
2439 return -EINVAL;
2440 }
2441
2442 static int process_control(struct ceph_connection *con, void *p, void *end)
2443 {
2444 int tag = con->v2.in_desc.fd_tag;
2445 int ret;
2446
2447 dout("%s con %p tag %d len %d\n", __func__, con, tag, (int)(end - p));
2448
2449 switch (tag) {
2450 case FRAME_TAG_HELLO:
2451 ret = process_hello(con, p, end);
2452 break;
2453 case FRAME_TAG_AUTH_BAD_METHOD:
2454 ret = process_auth_bad_method(con, p, end);
2455 break;
2456 case FRAME_TAG_AUTH_REPLY_MORE:
2457 ret = process_auth_reply_more(con, p, end);
2458 break;
2459 case FRAME_TAG_AUTH_DONE:
2460 ret = process_auth_done(con, p, end);
2461 break;
2462 case FRAME_TAG_AUTH_SIGNATURE:
2463 ret = process_auth_signature(con, p, end);
2464 break;
2465 case FRAME_TAG_SERVER_IDENT:
2466 ret = process_server_ident(con, p, end);
2467 break;
2468 case FRAME_TAG_IDENT_MISSING_FEATURES:
2469 ret = process_ident_missing_features(con, p, end);
2470 break;
2471 case FRAME_TAG_SESSION_RECONNECT_OK:
2472 ret = process_session_reconnect_ok(con, p, end);
2473 break;
2474 case FRAME_TAG_SESSION_RETRY:
2475 ret = process_session_retry(con, p, end);
2476 break;
2477 case FRAME_TAG_SESSION_RETRY_GLOBAL:
2478 ret = process_session_retry_global(con, p, end);
2479 break;
2480 case FRAME_TAG_SESSION_RESET:
2481 ret = process_session_reset(con, p, end);
2482 break;
2483 case FRAME_TAG_KEEPALIVE2_ACK:
2484 ret = process_keepalive2_ack(con, p, end);
2485 break;
2486 case FRAME_TAG_ACK:
2487 ret = process_ack(con, p, end);
2488 break;
2489 default:
2490 pr_err("bad tag %d\n", tag);
2491 con->error_msg = "protocol error, bad tag";
2492 return -EINVAL;
2493 }
2494 if (ret) {
2495 dout("%s con %p error %d\n", __func__, con, ret);
2496 return ret;
2497 }
2498
2499 prepare_read_preamble(con);
2500 return 0;
2501 }
2502
2503 /*
2504 * Return:
2505 * 1 - con->in_msg set, read message
2506 * 0 - skip message
2507 * <0 - error
2508 */
2509 static int process_message_header(struct ceph_connection *con,
2510 void *p, void *end)
2511 {
2512 struct ceph_frame_desc *desc = &con->v2.in_desc;
2513 struct ceph_msg_header2 *hdr2 = p;
2514 struct ceph_msg_header hdr;
2515 int skip;
2516 int ret;
2517 u64 seq;
2518
2519 /* verify seq# */
2520 seq = le64_to_cpu(hdr2->seq);
2521 if ((s64)seq - (s64)con->in_seq < 1) {
2522 pr_info("%s%lld %s skipping old message: seq %llu, expected %llu\n",
2523 ENTITY_NAME(con->peer_name),
2524 ceph_pr_addr(&con->peer_addr),
2525 seq, con->in_seq + 1);
2526 return 0;
2527 }
2528 if ((s64)seq - (s64)con->in_seq > 1) {
2529 pr_err("bad seq %llu, expected %llu\n", seq, con->in_seq + 1);
2530 con->error_msg = "bad message sequence # for incoming message";
2531 return -EBADE;
2532 }
2533
2534 ceph_con_discard_sent(con, le64_to_cpu(hdr2->ack_seq));
2535
2536 fill_header(&hdr, hdr2, desc->fd_lens[1], desc->fd_lens[2],
2537 desc->fd_lens[3], &con->peer_name);
2538 ret = ceph_con_in_msg_alloc(con, &hdr, &skip);
2539 if (ret)
2540 return ret;
2541
2542 WARN_ON(!con->in_msg ^ skip);
2543 if (skip)
2544 return 0;
2545
2546 WARN_ON(!con->in_msg);
2547 WARN_ON(con->in_msg->con != con);
2548 return 1;
2549 }
2550
2551 static int process_message(struct ceph_connection *con)
2552 {
2553 ceph_con_process_message(con);
2554
2555 /*
2556 * We could have been closed by ceph_con_close() because
2557 * ceph_con_process_message() temporarily drops con->mutex.
2558 */
2559 if (con->state != CEPH_CON_S_OPEN) {
2560 dout("%s con %p state changed to %d\n", __func__, con,
2561 con->state);
2562 return -EAGAIN;
2563 }
2564
2565 prepare_read_preamble(con);
2566 return 0;
2567 }
2568
2569 static int __handle_control(struct ceph_connection *con, void *p)
2570 {
2571 void *end = p + con->v2.in_desc.fd_lens[0];
2572 struct ceph_msg *msg;
2573 int ret;
2574
2575 if (con->v2.in_desc.fd_tag != FRAME_TAG_MESSAGE)
2576 return process_control(con, p, end);
2577
2578 ret = process_message_header(con, p, end);
2579 if (ret < 0)
2580 return ret;
2581 if (ret == 0) {
2582 prepare_skip_message(con);
2583 return 0;
2584 }
2585
2586 msg = con->in_msg; /* set in process_message_header() */
2587 if (!front_len(msg) && !middle_len(msg)) {
2588 if (!data_len(msg))
2589 return process_message(con);
2590
2591 prepare_read_data(con);
2592 return 0;
2593 }
2594
2595 reset_in_kvecs(con);
2596 if (front_len(msg)) {
2597 WARN_ON(front_len(msg) > msg->front_alloc_len);
2598 add_in_kvec(con, msg->front.iov_base, front_len(msg));
2599 msg->front.iov_len = front_len(msg);
2600
2601 if (con_secure(con) && need_padding(front_len(msg)))
2602 add_in_kvec(con, FRONT_PAD(con->v2.in_buf),
2603 padding_len(front_len(msg)));
2604 } else {
2605 msg->front.iov_len = 0;
2606 }
2607 if (middle_len(msg)) {
2608 WARN_ON(middle_len(msg) > msg->middle->alloc_len);
2609 add_in_kvec(con, msg->middle->vec.iov_base, middle_len(msg));
2610 msg->middle->vec.iov_len = middle_len(msg);
2611
2612 if (con_secure(con) && need_padding(middle_len(msg)))
2613 add_in_kvec(con, MIDDLE_PAD(con->v2.in_buf),
2614 padding_len(middle_len(msg)));
2615 } else if (msg->middle) {
2616 msg->middle->vec.iov_len = 0;
2617 }
2618
2619 if (data_len(msg)) {
2620 con->v2.in_state = IN_S_PREPARE_READ_DATA;
2621 } else {
2622 add_in_kvec(con, con->v2.in_buf,
2623 con_secure(con) ? CEPH_EPILOGUE_SECURE_LEN :
2624 CEPH_EPILOGUE_PLAIN_LEN);
2625 con->v2.in_state = IN_S_HANDLE_EPILOGUE;
2626 }
2627 return 0;
2628 }
2629
2630 static int handle_preamble(struct ceph_connection *con)
2631 {
2632 struct ceph_frame_desc *desc = &con->v2.in_desc;
2633 int ret;
2634
2635 if (con_secure(con)) {
2636 ret = decrypt_preamble(con);
2637 if (ret) {
2638 if (ret == -EBADMSG)
2639 con->error_msg = "integrity error, bad preamble auth tag";
2640 return ret;
2641 }
2642 }
2643
2644 ret = decode_preamble(con->v2.in_buf, desc);
2645 if (ret) {
2646 if (ret == -EBADMSG)
2647 con->error_msg = "integrity error, bad crc";
2648 else
2649 con->error_msg = "protocol error, bad preamble";
2650 return ret;
2651 }
2652
2653 dout("%s con %p tag %d seg_cnt %d %d+%d+%d+%d\n", __func__,
2654 con, desc->fd_tag, desc->fd_seg_cnt, desc->fd_lens[0],
2655 desc->fd_lens[1], desc->fd_lens[2], desc->fd_lens[3]);
2656
2657 if (!con_secure(con))
2658 return prepare_read_control(con);
2659
2660 if (desc->fd_lens[0] > CEPH_PREAMBLE_INLINE_LEN)
2661 return prepare_read_control_remainder(con);
2662
2663 return __handle_control(con, CTRL_BODY(con->v2.in_buf));
2664 }
2665
2666 static int handle_control(struct ceph_connection *con)
2667 {
2668 int ctrl_len = con->v2.in_desc.fd_lens[0];
2669 void *buf;
2670 int ret;
2671
2672 WARN_ON(con_secure(con));
2673
2674 ret = verify_control_crc(con);
2675 if (ret) {
2676 con->error_msg = "integrity error, bad crc";
2677 return ret;
2678 }
2679
2680 if (con->state == CEPH_CON_S_V2_AUTH) {
2681 buf = alloc_conn_buf(con, ctrl_len);
2682 if (!buf)
2683 return -ENOMEM;
2684
2685 memcpy(buf, con->v2.in_kvecs[0].iov_base, ctrl_len);
2686 return __handle_control(con, buf);
2687 }
2688
2689 return __handle_control(con, con->v2.in_kvecs[0].iov_base);
2690 }
2691
2692 static int handle_control_remainder(struct ceph_connection *con)
2693 {
2694 int ret;
2695
2696 WARN_ON(!con_secure(con));
2697
2698 ret = decrypt_control_remainder(con);
2699 if (ret) {
2700 if (ret == -EBADMSG)
2701 con->error_msg = "integrity error, bad control remainder auth tag";
2702 return ret;
2703 }
2704
2705 return __handle_control(con, con->v2.in_kvecs[0].iov_base -
2706 CEPH_PREAMBLE_INLINE_LEN);
2707 }
2708
2709 static int handle_epilogue(struct ceph_connection *con)
2710 {
2711 u32 front_crc, middle_crc, data_crc;
2712 int ret;
2713
2714 if (con_secure(con)) {
2715 ret = decrypt_message(con);
2716 if (ret) {
2717 if (ret == -EBADMSG)
2718 con->error_msg = "integrity error, bad epilogue auth tag";
2719 return ret;
2720 }
2721
2722 /* just late_status */
2723 ret = decode_epilogue(con->v2.in_buf, NULL, NULL, NULL);
2724 if (ret) {
2725 con->error_msg = "protocol error, bad epilogue";
2726 return ret;
2727 }
2728 } else {
2729 ret = decode_epilogue(con->v2.in_buf, &front_crc,
2730 &middle_crc, &data_crc);
2731 if (ret) {
2732 con->error_msg = "protocol error, bad epilogue";
2733 return ret;
2734 }
2735
2736 ret = verify_epilogue_crcs(con, front_crc, middle_crc,
2737 data_crc);
2738 if (ret) {
2739 con->error_msg = "integrity error, bad crc";
2740 return ret;
2741 }
2742 }
2743
2744 return process_message(con);
2745 }
2746
2747 static void finish_skip(struct ceph_connection *con)
2748 {
2749 dout("%s con %p\n", __func__, con);
2750
2751 if (con_secure(con))
2752 gcm_inc_nonce(&con->v2.in_gcm_nonce);
2753
2754 __finish_skip(con);
2755 }
2756
2757 static int populate_in_iter(struct ceph_connection *con)
2758 {
2759 int ret;
2760
2761 dout("%s con %p state %d in_state %d\n", __func__, con, con->state,
2762 con->v2.in_state);
2763 WARN_ON(iov_iter_count(&con->v2.in_iter));
2764
2765 if (con->state == CEPH_CON_S_V2_BANNER_PREFIX) {
2766 ret = process_banner_prefix(con);
2767 } else if (con->state == CEPH_CON_S_V2_BANNER_PAYLOAD) {
2768 ret = process_banner_payload(con);
2769 } else if ((con->state >= CEPH_CON_S_V2_HELLO &&
2770 con->state <= CEPH_CON_S_V2_SESSION_RECONNECT) ||
2771 con->state == CEPH_CON_S_OPEN) {
2772 switch (con->v2.in_state) {
2773 case IN_S_HANDLE_PREAMBLE:
2774 ret = handle_preamble(con);
2775 break;
2776 case IN_S_HANDLE_CONTROL:
2777 ret = handle_control(con);
2778 break;
2779 case IN_S_HANDLE_CONTROL_REMAINDER:
2780 ret = handle_control_remainder(con);
2781 break;
2782 case IN_S_PREPARE_READ_DATA:
2783 prepare_read_data(con);
2784 ret = 0;
2785 break;
2786 case IN_S_PREPARE_READ_DATA_CONT:
2787 prepare_read_data_cont(con);
2788 ret = 0;
2789 break;
2790 case IN_S_HANDLE_EPILOGUE:
2791 ret = handle_epilogue(con);
2792 break;
2793 case IN_S_FINISH_SKIP:
2794 finish_skip(con);
2795 ret = 0;
2796 break;
2797 default:
2798 WARN(1, "bad in_state %d", con->v2.in_state);
2799 return -EINVAL;
2800 }
2801 } else {
2802 WARN(1, "bad state %d", con->state);
2803 return -EINVAL;
2804 }
2805 if (ret) {
2806 dout("%s con %p error %d\n", __func__, con, ret);
2807 return ret;
2808 }
2809
2810 if (WARN_ON(!iov_iter_count(&con->v2.in_iter)))
2811 return -ENODATA;
2812 dout("%s con %p populated %zu\n", __func__, con,
2813 iov_iter_count(&con->v2.in_iter));
2814 return 1;
2815 }
2816
2817 int ceph_con_v2_try_read(struct ceph_connection *con)
2818 {
2819 int ret;
2820
2821 dout("%s con %p state %d need %zu\n", __func__, con, con->state,
2822 iov_iter_count(&con->v2.in_iter));
2823
2824 if (con->state == CEPH_CON_S_PREOPEN)
2825 return 0;
2826
2827 /*
2828 * We should always have something pending here. If not,
2829 * avoid calling populate_in_iter() as if we read something
2830 * (ceph_tcp_recv() would immediately return 1).
2831 */
2832 if (WARN_ON(!iov_iter_count(&con->v2.in_iter)))
2833 return -ENODATA;
2834
2835 for (;;) {
2836 ret = ceph_tcp_recv(con);
2837 if (ret <= 0)
2838 return ret;
2839
2840 ret = populate_in_iter(con);
2841 if (ret <= 0) {
2842 if (ret && ret != -EAGAIN && !con->error_msg)
2843 con->error_msg = "read processing error";
2844 return ret;
2845 }
2846 }
2847 }
2848
2849 static void queue_data(struct ceph_connection *con)
2850 {
2851 struct bio_vec bv;
2852
2853 con->v2.out_epil.data_crc = -1;
2854 ceph_msg_data_cursor_init(&con->v2.out_cursor, con->out_msg,
2855 data_len(con->out_msg));
2856
2857 get_bvec_at(&con->v2.out_cursor, &bv);
2858 set_out_bvec(con, &bv, true);
2859 con->v2.out_state = OUT_S_QUEUE_DATA_CONT;
2860 }
2861
2862 static void queue_data_cont(struct ceph_connection *con)
2863 {
2864 struct bio_vec bv;
2865
2866 con->v2.out_epil.data_crc = ceph_crc32c_page(
2867 con->v2.out_epil.data_crc, con->v2.out_bvec.bv_page,
2868 con->v2.out_bvec.bv_offset, con->v2.out_bvec.bv_len);
2869
2870 ceph_msg_data_advance(&con->v2.out_cursor, con->v2.out_bvec.bv_len);
2871 if (con->v2.out_cursor.total_resid) {
2872 get_bvec_at(&con->v2.out_cursor, &bv);
2873 set_out_bvec(con, &bv, true);
2874 WARN_ON(con->v2.out_state != OUT_S_QUEUE_DATA_CONT);
2875 return;
2876 }
2877
2878 /*
2879 * We've written all data. Queue epilogue. Once it's written,
2880 * we are done.
2881 */
2882 reset_out_kvecs(con);
2883 prepare_epilogue_plain(con, false);
2884 con->v2.out_state = OUT_S_FINISH_MESSAGE;
2885 }
2886
2887 static void queue_enc_page(struct ceph_connection *con)
2888 {
2889 struct bio_vec bv;
2890
2891 dout("%s con %p i %d resid %d\n", __func__, con, con->v2.out_enc_i,
2892 con->v2.out_enc_resid);
2893 WARN_ON(!con->v2.out_enc_resid);
2894
2895 bv.bv_page = con->v2.out_enc_pages[con->v2.out_enc_i];
2896 bv.bv_offset = 0;
2897 bv.bv_len = min(con->v2.out_enc_resid, (int)PAGE_SIZE);
2898
2899 set_out_bvec(con, &bv, false);
2900 con->v2.out_enc_i++;
2901 con->v2.out_enc_resid -= bv.bv_len;
2902
2903 if (con->v2.out_enc_resid) {
2904 WARN_ON(con->v2.out_state != OUT_S_QUEUE_ENC_PAGE);
2905 return;
2906 }
2907
2908 /*
2909 * We've queued the last piece of ciphertext (ending with
2910 * epilogue) + auth tag. Once it's written, we are done.
2911 */
2912 WARN_ON(con->v2.out_enc_i != con->v2.out_enc_page_cnt);
2913 con->v2.out_state = OUT_S_FINISH_MESSAGE;
2914 }
2915
2916 static void queue_zeros(struct ceph_connection *con)
2917 {
2918 dout("%s con %p out_zero %d\n", __func__, con, con->v2.out_zero);
2919
2920 if (con->v2.out_zero) {
2921 set_out_bvec_zero(con);
2922 con->v2.out_zero -= con->v2.out_bvec.bv_len;
2923 con->v2.out_state = OUT_S_QUEUE_ZEROS;
2924 return;
2925 }
2926
2927 /*
2928 * We've zero-filled everything up to epilogue. Queue epilogue
2929 * with late_status set to ABORTED and crcs adjusted for zeros.
2930 * Once it's written, we are done patching up for the revoke.
2931 */
2932 reset_out_kvecs(con);
2933 prepare_epilogue_plain(con, true);
2934 con->v2.out_state = OUT_S_FINISH_MESSAGE;
2935 }
2936
2937 static void finish_message(struct ceph_connection *con)
2938 {
2939 dout("%s con %p msg %p\n", __func__, con, con->out_msg);
2940
2941 /* we end up here both plain and secure modes */
2942 if (con->v2.out_enc_pages) {
2943 WARN_ON(!con->v2.out_enc_page_cnt);
2944 ceph_release_page_vector(con->v2.out_enc_pages,
2945 con->v2.out_enc_page_cnt);
2946 con->v2.out_enc_pages = NULL;
2947 con->v2.out_enc_page_cnt = 0;
2948 }
2949 /* message may have been revoked */
2950 if (con->out_msg) {
2951 ceph_msg_put(con->out_msg);
2952 con->out_msg = NULL;
2953 }
2954
2955 con->v2.out_state = OUT_S_GET_NEXT;
2956 }
2957
2958 static int populate_out_iter(struct ceph_connection *con)
2959 {
2960 int ret;
2961
2962 dout("%s con %p state %d out_state %d\n", __func__, con, con->state,
2963 con->v2.out_state);
2964 WARN_ON(iov_iter_count(&con->v2.out_iter));
2965
2966 if (con->state != CEPH_CON_S_OPEN) {
2967 WARN_ON(con->state < CEPH_CON_S_V2_BANNER_PREFIX ||
2968 con->state > CEPH_CON_S_V2_SESSION_RECONNECT);
2969 goto nothing_pending;
2970 }
2971
2972 switch (con->v2.out_state) {
2973 case OUT_S_QUEUE_DATA:
2974 WARN_ON(!con->out_msg);
2975 queue_data(con);
2976 goto populated;
2977 case OUT_S_QUEUE_DATA_CONT:
2978 WARN_ON(!con->out_msg);
2979 queue_data_cont(con);
2980 goto populated;
2981 case OUT_S_QUEUE_ENC_PAGE:
2982 queue_enc_page(con);
2983 goto populated;
2984 case OUT_S_QUEUE_ZEROS:
2985 WARN_ON(con->out_msg); /* revoked */
2986 queue_zeros(con);
2987 goto populated;
2988 case OUT_S_FINISH_MESSAGE:
2989 finish_message(con);
2990 break;
2991 case OUT_S_GET_NEXT:
2992 break;
2993 default:
2994 WARN(1, "bad out_state %d", con->v2.out_state);
2995 return -EINVAL;
2996 }
2997
2998 WARN_ON(con->v2.out_state != OUT_S_GET_NEXT);
2999 if (ceph_con_flag_test_and_clear(con, CEPH_CON_F_KEEPALIVE_PENDING)) {
3000 ret = prepare_keepalive2(con);
3001 if (ret) {
3002 pr_err("prepare_keepalive2 failed: %d\n", ret);
3003 return ret;
3004 }
3005 } else if (!list_empty(&con->out_queue)) {
3006 ceph_con_get_out_msg(con);
3007 ret = prepare_message(con);
3008 if (ret) {
3009 pr_err("prepare_message failed: %d\n", ret);
3010 return ret;
3011 }
3012 } else if (con->in_seq > con->in_seq_acked) {
3013 ret = prepare_ack(con);
3014 if (ret) {
3015 pr_err("prepare_ack failed: %d\n", ret);
3016 return ret;
3017 }
3018 } else {
3019 goto nothing_pending;
3020 }
3021
3022 populated:
3023 if (WARN_ON(!iov_iter_count(&con->v2.out_iter)))
3024 return -ENODATA;
3025 dout("%s con %p populated %zu\n", __func__, con,
3026 iov_iter_count(&con->v2.out_iter));
3027 return 1;
3028
3029 nothing_pending:
3030 WARN_ON(iov_iter_count(&con->v2.out_iter));
3031 dout("%s con %p nothing pending\n", __func__, con);
3032 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING);
3033 return 0;
3034 }
3035
3036 int ceph_con_v2_try_write(struct ceph_connection *con)
3037 {
3038 int ret;
3039
3040 dout("%s con %p state %d have %zu\n", __func__, con, con->state,
3041 iov_iter_count(&con->v2.out_iter));
3042
3043 /* open the socket first? */
3044 if (con->state == CEPH_CON_S_PREOPEN) {
3045 WARN_ON(con->peer_addr.type != CEPH_ENTITY_ADDR_TYPE_MSGR2);
3046
3047 /*
3048 * Always bump global_seq. Bump connect_seq only if
3049 * there is a session (i.e. we are reconnecting and will
3050 * send session_reconnect instead of client_ident).
3051 */
3052 con->v2.global_seq = ceph_get_global_seq(con->msgr, 0);
3053 if (con->v2.server_cookie)
3054 con->v2.connect_seq++;
3055
3056 ret = prepare_read_banner_prefix(con);
3057 if (ret) {
3058 pr_err("prepare_read_banner_prefix failed: %d\n", ret);
3059 con->error_msg = "connect error";
3060 return ret;
3061 }
3062
3063 reset_out_kvecs(con);
3064 ret = prepare_banner(con);
3065 if (ret) {
3066 pr_err("prepare_banner failed: %d\n", ret);
3067 con->error_msg = "connect error";
3068 return ret;
3069 }
3070
3071 ret = ceph_tcp_connect(con);
3072 if (ret) {
3073 pr_err("ceph_tcp_connect failed: %d\n", ret);
3074 con->error_msg = "connect error";
3075 return ret;
3076 }
3077 }
3078
3079 if (!iov_iter_count(&con->v2.out_iter)) {
3080 ret = populate_out_iter(con);
3081 if (ret <= 0) {
3082 if (ret && ret != -EAGAIN && !con->error_msg)
3083 con->error_msg = "write processing error";
3084 return ret;
3085 }
3086 }
3087
3088 tcp_sock_set_cork(con->sock->sk, true);
3089 for (;;) {
3090 ret = ceph_tcp_send(con);
3091 if (ret <= 0)
3092 break;
3093
3094 ret = populate_out_iter(con);
3095 if (ret <= 0) {
3096 if (ret && ret != -EAGAIN && !con->error_msg)
3097 con->error_msg = "write processing error";
3098 break;
3099 }
3100 }
3101
3102 tcp_sock_set_cork(con->sock->sk, false);
3103 return ret;
3104 }
3105
3106 static u32 crc32c_zeros(u32 crc, int zero_len)
3107 {
3108 int len;
3109
3110 while (zero_len) {
3111 len = min(zero_len, (int)PAGE_SIZE);
3112 crc = crc32c(crc, page_address(ceph_zero_page), len);
3113 zero_len -= len;
3114 }
3115
3116 return crc;
3117 }
3118
3119 static void prepare_zero_front(struct ceph_connection *con, int resid)
3120 {
3121 int sent;
3122
3123 WARN_ON(!resid || resid > front_len(con->out_msg));
3124 sent = front_len(con->out_msg) - resid;
3125 dout("%s con %p sent %d resid %d\n", __func__, con, sent, resid);
3126
3127 if (sent) {
3128 con->v2.out_epil.front_crc =
3129 crc32c(-1, con->out_msg->front.iov_base, sent);
3130 con->v2.out_epil.front_crc =
3131 crc32c_zeros(con->v2.out_epil.front_crc, resid);
3132 } else {
3133 con->v2.out_epil.front_crc = crc32c_zeros(-1, resid);
3134 }
3135
3136 con->v2.out_iter.count -= resid;
3137 out_zero_add(con, resid);
3138 }
3139
3140 static void prepare_zero_middle(struct ceph_connection *con, int resid)
3141 {
3142 int sent;
3143
3144 WARN_ON(!resid || resid > middle_len(con->out_msg));
3145 sent = middle_len(con->out_msg) - resid;
3146 dout("%s con %p sent %d resid %d\n", __func__, con, sent, resid);
3147
3148 if (sent) {
3149 con->v2.out_epil.middle_crc =
3150 crc32c(-1, con->out_msg->middle->vec.iov_base, sent);
3151 con->v2.out_epil.middle_crc =
3152 crc32c_zeros(con->v2.out_epil.middle_crc, resid);
3153 } else {
3154 con->v2.out_epil.middle_crc = crc32c_zeros(-1, resid);
3155 }
3156
3157 con->v2.out_iter.count -= resid;
3158 out_zero_add(con, resid);
3159 }
3160
3161 static void prepare_zero_data(struct ceph_connection *con)
3162 {
3163 dout("%s con %p\n", __func__, con);
3164 con->v2.out_epil.data_crc = crc32c_zeros(-1, data_len(con->out_msg));
3165 out_zero_add(con, data_len(con->out_msg));
3166 }
3167
3168 static void revoke_at_queue_data(struct ceph_connection *con)
3169 {
3170 int boundary;
3171 int resid;
3172
3173 WARN_ON(!data_len(con->out_msg));
3174 WARN_ON(!iov_iter_is_kvec(&con->v2.out_iter));
3175 resid = iov_iter_count(&con->v2.out_iter);
3176
3177 boundary = front_len(con->out_msg) + middle_len(con->out_msg);
3178 if (resid > boundary) {
3179 resid -= boundary;
3180 WARN_ON(resid > MESSAGE_HEAD_PLAIN_LEN);
3181 dout("%s con %p was sending head\n", __func__, con);
3182 if (front_len(con->out_msg))
3183 prepare_zero_front(con, front_len(con->out_msg));
3184 if (middle_len(con->out_msg))
3185 prepare_zero_middle(con, middle_len(con->out_msg));
3186 prepare_zero_data(con);
3187 WARN_ON(iov_iter_count(&con->v2.out_iter) != resid);
3188 con->v2.out_state = OUT_S_QUEUE_ZEROS;
3189 return;
3190 }
3191
3192 boundary = middle_len(con->out_msg);
3193 if (resid > boundary) {
3194 resid -= boundary;
3195 dout("%s con %p was sending front\n", __func__, con);
3196 prepare_zero_front(con, resid);
3197 if (middle_len(con->out_msg))
3198 prepare_zero_middle(con, middle_len(con->out_msg));
3199 prepare_zero_data(con);
3200 queue_zeros(con);
3201 return;
3202 }
3203
3204 WARN_ON(!resid);
3205 dout("%s con %p was sending middle\n", __func__, con);
3206 prepare_zero_middle(con, resid);
3207 prepare_zero_data(con);
3208 queue_zeros(con);
3209 }
3210
3211 static void revoke_at_queue_data_cont(struct ceph_connection *con)
3212 {
3213 int sent, resid; /* current piece of data */
3214
3215 WARN_ON(!data_len(con->out_msg));
3216 WARN_ON(!iov_iter_is_bvec(&con->v2.out_iter));
3217 resid = iov_iter_count(&con->v2.out_iter);
3218 WARN_ON(!resid || resid > con->v2.out_bvec.bv_len);
3219 sent = con->v2.out_bvec.bv_len - resid;
3220 dout("%s con %p sent %d resid %d\n", __func__, con, sent, resid);
3221
3222 if (sent) {
3223 con->v2.out_epil.data_crc = ceph_crc32c_page(
3224 con->v2.out_epil.data_crc, con->v2.out_bvec.bv_page,
3225 con->v2.out_bvec.bv_offset, sent);
3226 ceph_msg_data_advance(&con->v2.out_cursor, sent);
3227 }
3228 WARN_ON(resid > con->v2.out_cursor.total_resid);
3229 con->v2.out_epil.data_crc = crc32c_zeros(con->v2.out_epil.data_crc,
3230 con->v2.out_cursor.total_resid);
3231
3232 con->v2.out_iter.count -= resid;
3233 out_zero_add(con, con->v2.out_cursor.total_resid);
3234 queue_zeros(con);
3235 }
3236
3237 static void revoke_at_finish_message(struct ceph_connection *con)
3238 {
3239 int boundary;
3240 int resid;
3241
3242 WARN_ON(!iov_iter_is_kvec(&con->v2.out_iter));
3243 resid = iov_iter_count(&con->v2.out_iter);
3244
3245 if (!front_len(con->out_msg) && !middle_len(con->out_msg) &&
3246 !data_len(con->out_msg)) {
3247 WARN_ON(!resid || resid > MESSAGE_HEAD_PLAIN_LEN);
3248 dout("%s con %p was sending head (empty message) - noop\n",
3249 __func__, con);
3250 return;
3251 }
3252
3253 boundary = front_len(con->out_msg) + middle_len(con->out_msg) +
3254 CEPH_EPILOGUE_PLAIN_LEN;
3255 if (resid > boundary) {
3256 resid -= boundary;
3257 WARN_ON(resid > MESSAGE_HEAD_PLAIN_LEN);
3258 dout("%s con %p was sending head\n", __func__, con);
3259 if (front_len(con->out_msg))
3260 prepare_zero_front(con, front_len(con->out_msg));
3261 if (middle_len(con->out_msg))
3262 prepare_zero_middle(con, middle_len(con->out_msg));
3263 con->v2.out_iter.count -= CEPH_EPILOGUE_PLAIN_LEN;
3264 WARN_ON(iov_iter_count(&con->v2.out_iter) != resid);
3265 con->v2.out_state = OUT_S_QUEUE_ZEROS;
3266 return;
3267 }
3268
3269 boundary = middle_len(con->out_msg) + CEPH_EPILOGUE_PLAIN_LEN;
3270 if (resid > boundary) {
3271 resid -= boundary;
3272 dout("%s con %p was sending front\n", __func__, con);
3273 prepare_zero_front(con, resid);
3274 if (middle_len(con->out_msg))
3275 prepare_zero_middle(con, middle_len(con->out_msg));
3276 con->v2.out_iter.count -= CEPH_EPILOGUE_PLAIN_LEN;
3277 queue_zeros(con);
3278 return;
3279 }
3280
3281 boundary = CEPH_EPILOGUE_PLAIN_LEN;
3282 if (resid > boundary) {
3283 resid -= boundary;
3284 dout("%s con %p was sending middle\n", __func__, con);
3285 prepare_zero_middle(con, resid);
3286 con->v2.out_iter.count -= CEPH_EPILOGUE_PLAIN_LEN;
3287 queue_zeros(con);
3288 return;
3289 }
3290
3291 WARN_ON(!resid);
3292 dout("%s con %p was sending epilogue - noop\n", __func__, con);
3293 }
3294
3295 void ceph_con_v2_revoke(struct ceph_connection *con)
3296 {
3297 WARN_ON(con->v2.out_zero);
3298
3299 if (con_secure(con)) {
3300 WARN_ON(con->v2.out_state != OUT_S_QUEUE_ENC_PAGE &&
3301 con->v2.out_state != OUT_S_FINISH_MESSAGE);
3302 dout("%s con %p secure - noop\n", __func__, con);
3303 return;
3304 }
3305
3306 switch (con->v2.out_state) {
3307 case OUT_S_QUEUE_DATA:
3308 revoke_at_queue_data(con);
3309 break;
3310 case OUT_S_QUEUE_DATA_CONT:
3311 revoke_at_queue_data_cont(con);
3312 break;
3313 case OUT_S_FINISH_MESSAGE:
3314 revoke_at_finish_message(con);
3315 break;
3316 default:
3317 WARN(1, "bad out_state %d", con->v2.out_state);
3318 break;
3319 }
3320 }
3321
3322 static void revoke_at_prepare_read_data(struct ceph_connection *con)
3323 {
3324 int remaining; /* data + [data padding] + epilogue */
3325 int resid;
3326
3327 WARN_ON(!data_len(con->in_msg));
3328 WARN_ON(!iov_iter_is_kvec(&con->v2.in_iter));
3329 resid = iov_iter_count(&con->v2.in_iter);
3330 WARN_ON(!resid);
3331
3332 if (con_secure(con))
3333 remaining = padded_len(data_len(con->in_msg)) +
3334 CEPH_EPILOGUE_SECURE_LEN;
3335 else
3336 remaining = data_len(con->in_msg) + CEPH_EPILOGUE_PLAIN_LEN;
3337
3338 dout("%s con %p resid %d remaining %d\n", __func__, con, resid,
3339 remaining);
3340 con->v2.in_iter.count -= resid;
3341 set_in_skip(con, resid + remaining);
3342 con->v2.in_state = IN_S_FINISH_SKIP;
3343 }
3344
3345 static void revoke_at_prepare_read_data_cont(struct ceph_connection *con)
3346 {
3347 int recved, resid; /* current piece of data */
3348 int remaining; /* [data padding] + epilogue */
3349
3350 WARN_ON(!data_len(con->in_msg));
3351 WARN_ON(!iov_iter_is_bvec(&con->v2.in_iter));
3352 resid = iov_iter_count(&con->v2.in_iter);
3353 WARN_ON(!resid || resid > con->v2.in_bvec.bv_len);
3354 recved = con->v2.in_bvec.bv_len - resid;
3355 dout("%s con %p recved %d resid %d\n", __func__, con, recved, resid);
3356
3357 if (recved)
3358 ceph_msg_data_advance(&con->v2.in_cursor, recved);
3359 WARN_ON(resid > con->v2.in_cursor.total_resid);
3360
3361 if (con_secure(con))
3362 remaining = padding_len(data_len(con->in_msg)) +
3363 CEPH_EPILOGUE_SECURE_LEN;
3364 else
3365 remaining = CEPH_EPILOGUE_PLAIN_LEN;
3366
3367 dout("%s con %p total_resid %zu remaining %d\n", __func__, con,
3368 con->v2.in_cursor.total_resid, remaining);
3369 con->v2.in_iter.count -= resid;
3370 set_in_skip(con, con->v2.in_cursor.total_resid + remaining);
3371 con->v2.in_state = IN_S_FINISH_SKIP;
3372 }
3373
3374 static void revoke_at_handle_epilogue(struct ceph_connection *con)
3375 {
3376 int resid;
3377
3378 WARN_ON(!iov_iter_is_kvec(&con->v2.in_iter));
3379 resid = iov_iter_count(&con->v2.in_iter);
3380 WARN_ON(!resid);
3381
3382 dout("%s con %p resid %d\n", __func__, con, resid);
3383 con->v2.in_iter.count -= resid;
3384 set_in_skip(con, resid);
3385 con->v2.in_state = IN_S_FINISH_SKIP;
3386 }
3387
3388 void ceph_con_v2_revoke_incoming(struct ceph_connection *con)
3389 {
3390 switch (con->v2.in_state) {
3391 case IN_S_PREPARE_READ_DATA:
3392 revoke_at_prepare_read_data(con);
3393 break;
3394 case IN_S_PREPARE_READ_DATA_CONT:
3395 revoke_at_prepare_read_data_cont(con);
3396 break;
3397 case IN_S_HANDLE_EPILOGUE:
3398 revoke_at_handle_epilogue(con);
3399 break;
3400 default:
3401 WARN(1, "bad in_state %d", con->v2.in_state);
3402 break;
3403 }
3404 }
3405
3406 bool ceph_con_v2_opened(struct ceph_connection *con)
3407 {
3408 return con->v2.peer_global_seq;
3409 }
3410
3411 void ceph_con_v2_reset_session(struct ceph_connection *con)
3412 {
3413 con->v2.client_cookie = 0;
3414 con->v2.server_cookie = 0;
3415 con->v2.global_seq = 0;
3416 con->v2.connect_seq = 0;
3417 con->v2.peer_global_seq = 0;
3418 }
3419
3420 void ceph_con_v2_reset_protocol(struct ceph_connection *con)
3421 {
3422 iov_iter_truncate(&con->v2.in_iter, 0);
3423 iov_iter_truncate(&con->v2.out_iter, 0);
3424 con->v2.out_zero = 0;
3425
3426 clear_in_sign_kvecs(con);
3427 clear_out_sign_kvecs(con);
3428 free_conn_bufs(con);
3429
3430 if (con->v2.out_enc_pages) {
3431 WARN_ON(!con->v2.out_enc_page_cnt);
3432 ceph_release_page_vector(con->v2.out_enc_pages,
3433 con->v2.out_enc_page_cnt);
3434 con->v2.out_enc_pages = NULL;
3435 con->v2.out_enc_page_cnt = 0;
3436 }
3437
3438 con->v2.con_mode = CEPH_CON_MODE_UNKNOWN;
3439
3440 if (con->v2.hmac_tfm) {
3441 crypto_free_shash(con->v2.hmac_tfm);
3442 con->v2.hmac_tfm = NULL;
3443 }
3444 if (con->v2.gcm_req) {
3445 aead_request_free(con->v2.gcm_req);
3446 con->v2.gcm_req = NULL;
3447 }
3448 if (con->v2.gcm_tfm) {
3449 crypto_free_aead(con->v2.gcm_tfm);
3450 con->v2.gcm_tfm = NULL;
3451 }
3452 }
Linux with added FPC-III support