Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1 | /* |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 2 | * Copyright (C) 2016-2019 Red Hat, Inc. |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 3 | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
| 4 | * |
| 5 | * Network Block Device Client Side |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; under version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 20 | #include "qemu/osdep.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 21 | #include "qapi/error.h" |
Markus Armbruster | dc5e9ac | 2019-08-12 07:23:49 +0200 | [diff] [blame] | 22 | #include "qemu/queue.h" |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 23 | #include "trace.h" |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 24 | #include "nbd-internal.h" |
Eric Blake | 7c6f5dd | 2019-01-17 13:36:57 -0600 | [diff] [blame] | 25 | #include "qemu/cutils.h" |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 26 | |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 27 | /* Definitions for opaque data types */ |
| 28 | |
| 29 | static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); |
| 30 | |
| 31 | /* That's all folks */ |
| 32 | |
| 33 | /* Basic flow for negotiation |
| 34 | |
| 35 | Server Client |
| 36 | Negotiate |
| 37 | |
| 38 | or |
| 39 | |
| 40 | Server Client |
| 41 | Negotiate #1 |
| 42 | Option |
| 43 | Negotiate #2 |
| 44 | |
| 45 | ---- |
| 46 | |
| 47 | followed by |
| 48 | |
| 49 | Server Client |
| 50 | Request |
| 51 | Response |
| 52 | Request |
| 53 | Response |
| 54 | ... |
| 55 | ... |
| 56 | Request (type == 2) |
| 57 | |
| 58 | */ |
| 59 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 60 | /* Send an option request. |
| 61 | * |
| 62 | * The request is for option @opt, with @data containing @len bytes of |
| 63 | * additional payload for the request (@len may be -1 to treat @data as |
| 64 | * a C string; and @data may be NULL if @len is 0). |
| 65 | * Return 0 if successful, -1 with errp set if it is impossible to |
| 66 | * continue. */ |
| 67 | static int nbd_send_option_request(QIOChannel *ioc, uint32_t opt, |
| 68 | uint32_t len, const char *data, |
| 69 | Error **errp) |
| 70 | { |
Vladimir Sementsov-Ogievskiy | 795d946 | 2020-07-07 18:50:36 +0200 | [diff] [blame] | 71 | ERRP_GUARD(); |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 72 | NBDOption req; |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 73 | QEMU_BUILD_BUG_ON(sizeof(req) != 16); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 74 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 75 | if (len == -1) { |
| 76 | req.length = len = strlen(data); |
| 77 | } |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 78 | trace_nbd_send_option_request(opt, nbd_opt_lookup(opt), len); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 79 | |
| 80 | stq_be_p(&req.magic, NBD_OPTS_MAGIC); |
| 81 | stl_be_p(&req.option, opt); |
| 82 | stl_be_p(&req.length, len); |
| 83 | |
Vladimir Sementsov-Ogievskiy | d1fdf25 | 2017-06-02 18:01:39 +0300 | [diff] [blame] | 84 | if (nbd_write(ioc, &req, sizeof(req), errp) < 0) { |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 85 | error_prepend(errp, "Failed to send option request header: "); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 86 | return -1; |
| 87 | } |
| 88 | |
Vladimir Sementsov-Ogievskiy | d1fdf25 | 2017-06-02 18:01:39 +0300 | [diff] [blame] | 89 | if (len && nbd_write(ioc, (char *) data, len, errp) < 0) { |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 90 | error_prepend(errp, "Failed to send option request data: "); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 97 | /* Send NBD_OPT_ABORT as a courtesy to let the server know that we are |
| 98 | * not going to attempt further negotiation. */ |
| 99 | static void nbd_send_opt_abort(QIOChannel *ioc) |
| 100 | { |
| 101 | /* Technically, a compliant server is supposed to reply to us; but |
| 102 | * older servers disconnected instead. At any rate, we're allowed |
| 103 | * to disconnect without waiting for the server reply, so we don't |
| 104 | * even care if the request makes it to the server, let alone |
| 105 | * waiting around for whether the server replies. */ |
| 106 | nbd_send_option_request(ioc, NBD_OPT_ABORT, 0, NULL, NULL); |
| 107 | } |
| 108 | |
| 109 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 110 | /* Receive the header of an option reply, which should match the given |
| 111 | * opt. Read through the length field, but NOT the length bytes of |
| 112 | * payload. Return 0 if successful, -1 with errp set if it is |
| 113 | * impossible to continue. */ |
| 114 | static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt, |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 115 | NBDOptionReply *reply, Error **errp) |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 116 | { |
| 117 | QEMU_BUILD_BUG_ON(sizeof(*reply) != 20); |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 118 | if (nbd_read(ioc, reply, sizeof(*reply), "option reply", errp) < 0) { |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 119 | nbd_send_opt_abort(ioc); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 120 | return -1; |
| 121 | } |
Peter Maydell | 80c7c2b | 2018-09-27 17:42:00 +0100 | [diff] [blame] | 122 | reply->magic = be64_to_cpu(reply->magic); |
| 123 | reply->option = be32_to_cpu(reply->option); |
| 124 | reply->type = be32_to_cpu(reply->type); |
| 125 | reply->length = be32_to_cpu(reply->length); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 126 | |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 127 | trace_nbd_receive_option_reply(reply->option, nbd_opt_lookup(reply->option), |
| 128 | reply->type, nbd_rep_lookup(reply->type), |
| 129 | reply->length); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 130 | |
| 131 | if (reply->magic != NBD_REP_MAGIC) { |
| 132 | error_setg(errp, "Unexpected option reply magic"); |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 133 | nbd_send_opt_abort(ioc); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 134 | return -1; |
| 135 | } |
| 136 | if (reply->option != opt) { |
Eric Blake | 6c5c035 | 2018-12-15 07:53:07 -0600 | [diff] [blame] | 137 | error_setg(errp, "Unexpected option type %u (%s), expected %u (%s)", |
| 138 | reply->option, nbd_opt_lookup(reply->option), |
| 139 | opt, nbd_opt_lookup(opt)); |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 140 | nbd_send_opt_abort(ioc); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 141 | return -1; |
| 142 | } |
| 143 | return 0; |
| 144 | } |
| 145 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 146 | /* |
| 147 | * If reply represents success, return 1 without further action. If |
| 148 | * reply represents an error, consume the optional payload of the |
| 149 | * packet on ioc. Then return 0 for unsupported (so the client can |
| 150 | * fall back to other approaches), where @strict determines if only |
| 151 | * ERR_UNSUP or all errors fit that category, or -1 with errp set for |
| 152 | * other errors. |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 153 | */ |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 154 | static int nbd_handle_reply_err(QIOChannel *ioc, NBDOptionReply *reply, |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 155 | bool strict, Error **errp) |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 156 | { |
Vladimir Sementsov-Ogievskiy | 795d946 | 2020-07-07 18:50:36 +0200 | [diff] [blame] | 157 | ERRP_GUARD(); |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 158 | g_autofree char *msg = NULL; |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 159 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 160 | if (!(reply->type & (1 << 31))) { |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 161 | return 1; |
| 162 | } |
| 163 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 164 | if (reply->length) { |
| 165 | if (reply->length > NBD_MAX_BUFFER_SIZE) { |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 166 | error_setg(errp, "server error %" PRIu32 |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 167 | " (%s) message is too long", |
| 168 | reply->type, nbd_rep_lookup(reply->type)); |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 169 | goto err; |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 170 | } |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 171 | msg = g_malloc(reply->length + 1); |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 172 | if (nbd_read(ioc, msg, reply->length, NULL, errp) < 0) { |
| 173 | error_prepend(errp, "Failed to read option error %" PRIu32 |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 174 | " (%s) message: ", |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 175 | reply->type, nbd_rep_lookup(reply->type)); |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 176 | goto err; |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 177 | } |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 178 | msg[reply->length] = '\0'; |
Eric Blake | bee21ef | 2018-12-18 16:57:13 -0600 | [diff] [blame] | 179 | trace_nbd_server_error_msg(reply->type, |
| 180 | nbd_reply_type_lookup(reply->type), msg); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 181 | } |
| 182 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 183 | if (reply->type == NBD_REP_ERR_UNSUP || !strict) { |
| 184 | trace_nbd_reply_err_ignored(reply->option, |
| 185 | nbd_opt_lookup(reply->option), |
| 186 | reply->type, nbd_rep_lookup(reply->type)); |
| 187 | return 0; |
| 188 | } |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 189 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 190 | switch (reply->type) { |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 191 | case NBD_REP_ERR_POLICY: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 192 | error_setg(errp, "Denied by server for option %" PRIu32 " (%s)", |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 193 | reply->option, nbd_opt_lookup(reply->option)); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 194 | break; |
| 195 | |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 196 | case NBD_REP_ERR_INVALID: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 197 | error_setg(errp, "Invalid parameters for option %" PRIu32 " (%s)", |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 198 | reply->option, nbd_opt_lookup(reply->option)); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 199 | break; |
| 200 | |
Eric Blake | b6f5d3b | 2016-10-14 13:33:16 -0500 | [diff] [blame] | 201 | case NBD_REP_ERR_PLATFORM: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 202 | error_setg(errp, "Server lacks support for option %" PRIu32 " (%s)", |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 203 | reply->option, nbd_opt_lookup(reply->option)); |
Eric Blake | b6f5d3b | 2016-10-14 13:33:16 -0500 | [diff] [blame] | 204 | break; |
| 205 | |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 206 | case NBD_REP_ERR_TLS_REQD: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 207 | error_setg(errp, "TLS negotiation required before option %" PRIu32 |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 208 | " (%s)", reply->option, nbd_opt_lookup(reply->option)); |
Eric Blake | 1b5c15c | 2019-09-07 12:20:55 -0500 | [diff] [blame] | 209 | error_append_hint(errp, "Did you forget a valid tls-creds?\n"); |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 210 | break; |
| 211 | |
| 212 | case NBD_REP_ERR_UNKNOWN: |
Eric Blake | 9a76bd7 | 2017-07-17 09:23:10 -0500 | [diff] [blame] | 213 | error_setg(errp, "Requested export not available"); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 214 | break; |
| 215 | |
Eric Blake | b6f5d3b | 2016-10-14 13:33:16 -0500 | [diff] [blame] | 216 | case NBD_REP_ERR_SHUTDOWN: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 217 | error_setg(errp, "Server shutting down before option %" PRIu32 " (%s)", |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 218 | reply->option, nbd_opt_lookup(reply->option)); |
| 219 | break; |
| 220 | |
| 221 | case NBD_REP_ERR_BLOCK_SIZE_REQD: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 222 | error_setg(errp, "Server requires INFO_BLOCK_SIZE for option %" PRIu32 |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 223 | " (%s)", reply->option, nbd_opt_lookup(reply->option)); |
Eric Blake | b6f5d3b | 2016-10-14 13:33:16 -0500 | [diff] [blame] | 224 | break; |
| 225 | |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 226 | default: |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 227 | error_setg(errp, "Unknown error code when asking for option %" PRIu32 |
Eric Blake | 3736cc5 | 2017-07-07 15:30:43 -0500 | [diff] [blame] | 228 | " (%s)", reply->option, nbd_opt_lookup(reply->option)); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 229 | break; |
| 230 | } |
| 231 | |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 232 | if (msg) { |
Eric Blake | 9a76bd7 | 2017-07-17 09:23:10 -0500 | [diff] [blame] | 233 | error_append_hint(errp, "server reported: %s\n", msg); |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 234 | } |
| 235 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 236 | err: |
| 237 | nbd_send_opt_abort(ioc); |
| 238 | return -1; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 239 | } |
| 240 | |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 241 | /* nbd_receive_list: |
| 242 | * Process another portion of the NBD_OPT_LIST reply, populating any |
| 243 | * name received into *@name. If @description is non-NULL, and the |
| 244 | * server provided a description, that is also populated. The caller |
| 245 | * must eventually call g_free() on success. |
| 246 | * Returns 1 if name and description were set and iteration must continue, |
| 247 | * 0 if iteration is complete (including if OPT_LIST unsupported), |
| 248 | * -1 with @errp set if an unrecoverable error occurred. |
| 249 | */ |
| 250 | static int nbd_receive_list(QIOChannel *ioc, char **name, char **description, |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 251 | Error **errp) |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 252 | { |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 253 | NBDOptionReply reply; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 254 | uint32_t len; |
| 255 | uint32_t namelen; |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 256 | g_autofree char *local_name = NULL; |
| 257 | g_autofree char *local_desc = NULL; |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 258 | int error; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 259 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 260 | if (nbd_receive_option_reply(ioc, NBD_OPT_LIST, &reply, errp) < 0) { |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 261 | return -1; |
| 262 | } |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 263 | error = nbd_handle_reply_err(ioc, &reply, true, errp); |
Alex Bligh | 6ff5816 | 2016-04-06 10:59:22 -0600 | [diff] [blame] | 264 | if (error <= 0) { |
| 265 | return error; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 266 | } |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 267 | len = reply.length; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 268 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 269 | if (reply.type == NBD_REP_ACK) { |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 270 | if (len != 0) { |
| 271 | error_setg(errp, "length too long for option end"); |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 272 | nbd_send_opt_abort(ioc); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 273 | return -1; |
| 274 | } |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 275 | return 0; |
| 276 | } else if (reply.type != NBD_REP_SERVER) { |
Eric Blake | 6c5c035 | 2018-12-15 07:53:07 -0600 | [diff] [blame] | 277 | error_setg(errp, "Unexpected reply type %u (%s), expected %u (%s)", |
| 278 | reply.type, nbd_rep_lookup(reply.type), |
| 279 | NBD_REP_SERVER, nbd_rep_lookup(NBD_REP_SERVER)); |
Eric Blake | 2cdbf41 | 2016-10-14 13:33:11 -0500 | [diff] [blame] | 280 | nbd_send_opt_abort(ioc); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 281 | return -1; |
| 282 | } |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 283 | |
| 284 | if (len < sizeof(namelen) || len > NBD_MAX_BUFFER_SIZE) { |
| 285 | error_setg(errp, "incorrect option length %" PRIu32, len); |
| 286 | nbd_send_opt_abort(ioc); |
| 287 | return -1; |
| 288 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 289 | if (nbd_read32(ioc, &namelen, "option name length", errp) < 0) { |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 290 | nbd_send_opt_abort(ioc); |
| 291 | return -1; |
| 292 | } |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 293 | len -= sizeof(namelen); |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 294 | if (len < namelen || namelen > NBD_MAX_STRING_SIZE) { |
| 295 | error_setg(errp, "incorrect name length in server's list response"); |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 296 | nbd_send_opt_abort(ioc); |
| 297 | return -1; |
| 298 | } |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 299 | |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 300 | local_name = g_malloc(namelen + 1); |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 301 | if (nbd_read(ioc, local_name, namelen, "export name", errp) < 0) { |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 302 | nbd_send_opt_abort(ioc); |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 303 | return -1; |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 304 | } |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 305 | local_name[namelen] = '\0'; |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 306 | len -= namelen; |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 307 | if (len) { |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 308 | if (len > NBD_MAX_STRING_SIZE) { |
| 309 | error_setg(errp, "incorrect description length in server's " |
| 310 | "list response"); |
| 311 | nbd_send_opt_abort(ioc); |
| 312 | return -1; |
| 313 | } |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 314 | local_desc = g_malloc(len + 1); |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 315 | if (nbd_read(ioc, local_desc, len, "export description", errp) < 0) { |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 316 | nbd_send_opt_abort(ioc); |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 317 | return -1; |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 318 | } |
| 319 | local_desc[len] = '\0'; |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 320 | } |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 321 | |
| 322 | trace_nbd_receive_list(local_name, local_desc ?: ""); |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 323 | *name = g_steal_pointer(&local_name); |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 324 | if (description) { |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 325 | *description = g_steal_pointer(&local_desc); |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 326 | } |
Eric Blake | df18c04 | 2019-08-24 12:28:12 -0500 | [diff] [blame] | 327 | return 1; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 331 | /* |
| 332 | * nbd_opt_info_or_go: |
| 333 | * Send option for NBD_OPT_INFO or NBD_OPT_GO and parse the reply. |
| 334 | * Returns -1 if the option proves the export @info->name cannot be |
| 335 | * used, 0 if the option is unsupported (fall back to NBD_OPT_LIST and |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 336 | * NBD_OPT_EXPORT_NAME in that case), and > 0 if the export is good to |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 337 | * go (with the rest of @info populated). |
| 338 | */ |
| 339 | static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t opt, |
| 340 | NBDExportInfo *info, Error **errp) |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 341 | { |
Vladimir Sementsov-Ogievskiy | 795d946 | 2020-07-07 18:50:36 +0200 | [diff] [blame] | 342 | ERRP_GUARD(); |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 343 | NBDOptionReply reply; |
Eric Blake | 6dc1667 | 2019-01-17 13:36:46 -0600 | [diff] [blame] | 344 | uint32_t len = strlen(info->name); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 345 | uint16_t type; |
| 346 | int error; |
| 347 | char *buf; |
| 348 | |
| 349 | /* The protocol requires that the server send NBD_INFO_EXPORT with |
| 350 | * a non-zero flags (at least NBD_FLAG_HAS_FLAGS must be set); so |
| 351 | * flags still 0 is a witness of a broken server. */ |
| 352 | info->flags = 0; |
| 353 | |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 354 | assert(opt == NBD_OPT_GO || opt == NBD_OPT_INFO); |
| 355 | trace_nbd_opt_info_go_start(nbd_opt_lookup(opt), info->name); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 356 | buf = g_malloc(4 + len + 2 + 2 * info->request_sizes + 1); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 357 | stl_be_p(buf, len); |
Eric Blake | 6dc1667 | 2019-01-17 13:36:46 -0600 | [diff] [blame] | 358 | memcpy(buf + 4, info->name, len); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 359 | /* At most one request, everything else up to server */ |
| 360 | stw_be_p(buf + 4 + len, info->request_sizes); |
| 361 | if (info->request_sizes) { |
| 362 | stw_be_p(buf + 4 + len + 2, NBD_INFO_BLOCK_SIZE); |
| 363 | } |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 364 | error = nbd_send_option_request(ioc, opt, |
Philippe Mathieu-Daudé | 158b9aa | 2017-07-26 23:42:09 -0300 | [diff] [blame] | 365 | 4 + len + 2 + 2 * info->request_sizes, |
| 366 | buf, errp); |
| 367 | g_free(buf); |
| 368 | if (error < 0) { |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 369 | return -1; |
| 370 | } |
| 371 | |
| 372 | while (1) { |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 373 | if (nbd_receive_option_reply(ioc, opt, &reply, errp) < 0) { |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 374 | return -1; |
| 375 | } |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 376 | error = nbd_handle_reply_err(ioc, &reply, true, errp); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 377 | if (error <= 0) { |
| 378 | return error; |
| 379 | } |
| 380 | len = reply.length; |
| 381 | |
| 382 | if (reply.type == NBD_REP_ACK) { |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 383 | /* |
| 384 | * Server is done sending info, and moved into transmission |
| 385 | * phase for NBD_OPT_GO, but make sure it sent flags |
| 386 | */ |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 387 | if (len) { |
| 388 | error_setg(errp, "server sent invalid NBD_REP_ACK"); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 389 | return -1; |
| 390 | } |
| 391 | if (!info->flags) { |
| 392 | error_setg(errp, "broken server omitted NBD_INFO_EXPORT"); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 393 | return -1; |
| 394 | } |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 395 | trace_nbd_opt_info_go_success(nbd_opt_lookup(opt)); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 396 | return 1; |
| 397 | } |
| 398 | if (reply.type != NBD_REP_INFO) { |
Eric Blake | 6c5c035 | 2018-12-15 07:53:07 -0600 | [diff] [blame] | 399 | error_setg(errp, "unexpected reply type %u (%s), expected %u (%s)", |
| 400 | reply.type, nbd_rep_lookup(reply.type), |
| 401 | NBD_REP_INFO, nbd_rep_lookup(NBD_REP_INFO)); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 402 | nbd_send_opt_abort(ioc); |
| 403 | return -1; |
| 404 | } |
| 405 | if (len < sizeof(type)) { |
| 406 | error_setg(errp, "NBD_REP_INFO length %" PRIu32 " is too short", |
| 407 | len); |
| 408 | nbd_send_opt_abort(ioc); |
| 409 | return -1; |
| 410 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 411 | if (nbd_read16(ioc, &type, "info type", errp) < 0) { |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 412 | nbd_send_opt_abort(ioc); |
| 413 | return -1; |
| 414 | } |
| 415 | len -= sizeof(type); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 416 | switch (type) { |
| 417 | case NBD_INFO_EXPORT: |
| 418 | if (len != sizeof(info->size) + sizeof(info->flags)) { |
| 419 | error_setg(errp, "remaining export info len %" PRIu32 |
| 420 | " is unexpected size", len); |
| 421 | nbd_send_opt_abort(ioc); |
| 422 | return -1; |
| 423 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 424 | if (nbd_read64(ioc, &info->size, "info size", errp) < 0) { |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 425 | nbd_send_opt_abort(ioc); |
| 426 | return -1; |
| 427 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 428 | if (nbd_read16(ioc, &info->flags, "info flags", errp) < 0) { |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 429 | nbd_send_opt_abort(ioc); |
| 430 | return -1; |
| 431 | } |
Eric Blake | 3add3ab | 2019-03-30 10:57:04 -0500 | [diff] [blame] | 432 | if (info->min_block && |
| 433 | !QEMU_IS_ALIGNED(info->size, info->min_block)) { |
Eric Blake | e53f88d | 2019-04-04 09:52:26 -0500 | [diff] [blame] | 434 | error_setg(errp, "export size %" PRIu64 " is not multiple of " |
Eric Blake | 3add3ab | 2019-03-30 10:57:04 -0500 | [diff] [blame] | 435 | "minimum block size %" PRIu32, info->size, |
| 436 | info->min_block); |
| 437 | nbd_send_opt_abort(ioc); |
| 438 | return -1; |
| 439 | } |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 440 | trace_nbd_receive_negotiate_size_flags(info->size, info->flags); |
| 441 | break; |
| 442 | |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 443 | case NBD_INFO_BLOCK_SIZE: |
| 444 | if (len != sizeof(info->min_block) * 3) { |
| 445 | error_setg(errp, "remaining export info len %" PRIu32 |
| 446 | " is unexpected size", len); |
| 447 | nbd_send_opt_abort(ioc); |
| 448 | return -1; |
| 449 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 450 | if (nbd_read32(ioc, &info->min_block, "info minimum block size", |
| 451 | errp) < 0) { |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 452 | nbd_send_opt_abort(ioc); |
| 453 | return -1; |
| 454 | } |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 455 | if (!is_power_of_2(info->min_block)) { |
Eric Blake | e475d10 | 2018-05-01 10:46:53 -0500 | [diff] [blame] | 456 | error_setg(errp, "server minimum block size %" PRIu32 |
| 457 | " is not a power of two", info->min_block); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 458 | nbd_send_opt_abort(ioc); |
| 459 | return -1; |
| 460 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 461 | if (nbd_read32(ioc, &info->opt_block, "info preferred block size", |
| 462 | errp) < 0) |
| 463 | { |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 464 | nbd_send_opt_abort(ioc); |
| 465 | return -1; |
| 466 | } |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 467 | if (!is_power_of_2(info->opt_block) || |
| 468 | info->opt_block < info->min_block) { |
Eric Blake | e475d10 | 2018-05-01 10:46:53 -0500 | [diff] [blame] | 469 | error_setg(errp, "server preferred block size %" PRIu32 |
| 470 | " is not valid", info->opt_block); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 471 | nbd_send_opt_abort(ioc); |
| 472 | return -1; |
| 473 | } |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 474 | if (nbd_read32(ioc, &info->max_block, "info maximum block size", |
| 475 | errp) < 0) |
| 476 | { |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 477 | nbd_send_opt_abort(ioc); |
| 478 | return -1; |
| 479 | } |
Eric Blake | e475d10 | 2018-05-01 10:46:53 -0500 | [diff] [blame] | 480 | if (info->max_block < info->min_block) { |
| 481 | error_setg(errp, "server maximum block size %" PRIu32 |
| 482 | " is not valid", info->max_block); |
| 483 | nbd_send_opt_abort(ioc); |
| 484 | return -1; |
| 485 | } |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 486 | trace_nbd_opt_info_block_size(info->min_block, info->opt_block, |
| 487 | info->max_block); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 488 | break; |
| 489 | |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 490 | default: |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 491 | /* |
| 492 | * Not worth the bother to check if NBD_INFO_NAME or |
| 493 | * NBD_INFO_DESCRIPTION exceed NBD_MAX_STRING_SIZE. |
| 494 | */ |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 495 | trace_nbd_opt_info_unknown(type, nbd_info_lookup(type)); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 496 | if (nbd_drop(ioc, len, errp) < 0) { |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 497 | error_prepend(errp, "Failed to read info payload: "); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 498 | nbd_send_opt_abort(ioc); |
| 499 | return -1; |
| 500 | } |
| 501 | break; |
| 502 | } |
| 503 | } |
| 504 | } |
| 505 | |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 506 | /* Return -1 on failure, 0 if wantname is an available export. */ |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 507 | static int nbd_receive_query_exports(QIOChannel *ioc, |
| 508 | const char *wantname, |
| 509 | Error **errp) |
| 510 | { |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 511 | bool list_empty = true; |
| 512 | bool found_export = false; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 513 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 514 | trace_nbd_receive_query_exports_start(wantname); |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 515 | if (nbd_send_option_request(ioc, NBD_OPT_LIST, 0, NULL, errp) < 0) { |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 516 | return -1; |
| 517 | } |
| 518 | |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 519 | while (1) { |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 520 | char *name; |
| 521 | int ret = nbd_receive_list(ioc, &name, NULL, errp); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 522 | |
| 523 | if (ret < 0) { |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 524 | /* Server gave unexpected reply */ |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 525 | return -1; |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 526 | } else if (ret == 0) { |
| 527 | /* Done iterating. */ |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 528 | if (list_empty) { |
| 529 | /* |
| 530 | * We don't have enough context to tell a server that |
| 531 | * sent an empty list apart from a server that does |
| 532 | * not support the list command; but as this function |
| 533 | * is just used to trigger a nicer error message |
| 534 | * before trying NBD_OPT_EXPORT_NAME, assume the |
| 535 | * export is available. |
| 536 | */ |
| 537 | return 0; |
| 538 | } else if (!found_export) { |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 539 | error_setg(errp, "No export with name '%s' available", |
| 540 | wantname); |
| 541 | nbd_send_opt_abort(ioc); |
| 542 | return -1; |
| 543 | } |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 544 | trace_nbd_receive_query_exports_success(wantname); |
Eric Blake | 75368aa | 2016-10-14 13:33:13 -0500 | [diff] [blame] | 545 | return 0; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 546 | } |
Eric Blake | 091d0bf | 2019-01-17 13:36:45 -0600 | [diff] [blame] | 547 | list_empty = false; |
| 548 | if (!strcmp(name, wantname)) { |
| 549 | found_export = true; |
| 550 | } |
| 551 | g_free(name); |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 552 | } |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 553 | } |
| 554 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 555 | /* |
| 556 | * nbd_request_simple_option: Send an option request, and parse the reply. |
| 557 | * @strict controls whether ERR_UNSUP or all errors produce 0 status. |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 558 | * return 1 for successful negotiation, |
| 559 | * 0 if operation is unsupported, |
| 560 | * -1 with errp set for any other error |
| 561 | */ |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 562 | static int nbd_request_simple_option(QIOChannel *ioc, int opt, bool strict, |
| 563 | Error **errp) |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 564 | { |
Vladimir Sementsov-Ogievskiy | 420a4e9 | 2017-11-22 13:19:57 +0300 | [diff] [blame] | 565 | NBDOptionReply reply; |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 566 | int error; |
| 567 | |
| 568 | if (nbd_send_option_request(ioc, opt, 0, NULL, errp) < 0) { |
| 569 | return -1; |
| 570 | } |
| 571 | |
| 572 | if (nbd_receive_option_reply(ioc, opt, &reply, errp) < 0) { |
| 573 | return -1; |
| 574 | } |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 575 | error = nbd_handle_reply_err(ioc, &reply, strict, errp); |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 576 | if (error <= 0) { |
| 577 | return error; |
| 578 | } |
| 579 | |
| 580 | if (reply.type != NBD_REP_ACK) { |
| 581 | error_setg(errp, "Server answered option %d (%s) with unexpected " |
Vladimir Sementsov-Ogievskiy | 28fb494 | 2018-02-15 16:51:43 +0300 | [diff] [blame] | 582 | "reply %" PRIu32 " (%s)", opt, nbd_opt_lookup(opt), |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 583 | reply.type, nbd_rep_lookup(reply.type)); |
| 584 | nbd_send_opt_abort(ioc); |
| 585 | return -1; |
| 586 | } |
| 587 | |
| 588 | if (reply.length != 0) { |
| 589 | error_setg(errp, "Option %d ('%s') response length is %" PRIu32 |
| 590 | " (it should be zero)", opt, nbd_opt_lookup(opt), |
| 591 | reply.length); |
| 592 | nbd_send_opt_abort(ioc); |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | return 1; |
| 597 | } |
| 598 | |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 599 | static QIOChannel *nbd_receive_starttls(QIOChannel *ioc, |
| 600 | QCryptoTLSCreds *tlscreds, |
| 601 | const char *hostname, Error **errp) |
| 602 | { |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 603 | int ret; |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 604 | QIOChannelTLS *tioc; |
| 605 | struct NBDTLSHandshakeData data = { 0 }; |
| 606 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 607 | ret = nbd_request_simple_option(ioc, NBD_OPT_STARTTLS, true, errp); |
Vladimir Sementsov-Ogievskiy | d795299 | 2017-10-27 12:40:34 +0200 | [diff] [blame] | 608 | if (ret <= 0) { |
| 609 | if (ret == 0) { |
| 610 | error_setg(errp, "Server don't support STARTTLS option"); |
| 611 | nbd_send_opt_abort(ioc); |
| 612 | } |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 613 | return NULL; |
| 614 | } |
| 615 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 616 | trace_nbd_receive_starttls_new_client(); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 617 | tioc = qio_channel_tls_new_client(ioc, tlscreds, hostname, errp); |
| 618 | if (!tioc) { |
| 619 | return NULL; |
| 620 | } |
Daniel P. Berrange | 0d73f72 | 2016-09-30 11:57:14 +0100 | [diff] [blame] | 621 | qio_channel_set_name(QIO_CHANNEL(tioc), "nbd-client-tls"); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 622 | data.loop = g_main_loop_new(g_main_context_default(), FALSE); |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 623 | trace_nbd_receive_starttls_tls_handshake(); |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 624 | qio_channel_tls_handshake(tioc, |
| 625 | nbd_tls_handshake, |
| 626 | &data, |
Peter Xu | 1939ccd | 2018-03-05 14:43:24 +0800 | [diff] [blame] | 627 | NULL, |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 628 | NULL); |
| 629 | |
| 630 | if (!data.complete) { |
| 631 | g_main_loop_run(data.loop); |
| 632 | } |
| 633 | g_main_loop_unref(data.loop); |
| 634 | if (data.error) { |
| 635 | error_propagate(errp, data.error); |
| 636 | object_unref(OBJECT(tioc)); |
| 637 | return NULL; |
| 638 | } |
| 639 | |
| 640 | return QIO_CHANNEL(tioc); |
| 641 | } |
| 642 | |
Eric Blake | 757b3ab | 2019-01-17 13:36:48 -0600 | [diff] [blame] | 643 | /* |
| 644 | * nbd_send_meta_query: |
| 645 | * Send 0 or 1 set/list meta context queries. |
| 646 | * Return 0 on success, -1 with errp set for any error |
| 647 | */ |
| 648 | static int nbd_send_meta_query(QIOChannel *ioc, uint32_t opt, |
| 649 | const char *export, const char *query, |
| 650 | Error **errp) |
| 651 | { |
| 652 | int ret; |
| 653 | uint32_t export_len = strlen(export); |
| 654 | uint32_t queries = !!query; |
| 655 | uint32_t query_len = 0; |
| 656 | uint32_t data_len; |
| 657 | char *data; |
| 658 | char *p; |
| 659 | |
| 660 | data_len = sizeof(export_len) + export_len + sizeof(queries); |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 661 | assert(export_len <= NBD_MAX_STRING_SIZE); |
Eric Blake | 757b3ab | 2019-01-17 13:36:48 -0600 | [diff] [blame] | 662 | if (query) { |
| 663 | query_len = strlen(query); |
| 664 | data_len += sizeof(query_len) + query_len; |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 665 | assert(query_len <= NBD_MAX_STRING_SIZE); |
Eric Blake | 757b3ab | 2019-01-17 13:36:48 -0600 | [diff] [blame] | 666 | } else { |
| 667 | assert(opt == NBD_OPT_LIST_META_CONTEXT); |
| 668 | } |
| 669 | p = data = g_malloc(data_len); |
| 670 | |
| 671 | trace_nbd_opt_meta_request(nbd_opt_lookup(opt), query ?: "(all)", export); |
| 672 | stl_be_p(p, export_len); |
| 673 | memcpy(p += sizeof(export_len), export, export_len); |
| 674 | stl_be_p(p += export_len, queries); |
| 675 | if (query) { |
| 676 | stl_be_p(p += sizeof(queries), query_len); |
| 677 | memcpy(p += sizeof(query_len), query, query_len); |
| 678 | } |
| 679 | |
| 680 | ret = nbd_send_option_request(ioc, opt, data_len, data, errp); |
| 681 | g_free(data); |
| 682 | return ret; |
| 683 | } |
| 684 | |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 685 | /* |
| 686 | * nbd_receive_one_meta_context: |
| 687 | * Called in a loop to receive and trace one set/list meta context reply. |
| 688 | * Pass non-NULL @name or @id to collect results back to the caller, which |
| 689 | * must eventually call g_free(). |
| 690 | * return 1 if name is set and iteration must continue, |
| 691 | * 0 if iteration is complete (including if option is unsupported), |
| 692 | * -1 with errp set for any error |
| 693 | */ |
| 694 | static int nbd_receive_one_meta_context(QIOChannel *ioc, |
| 695 | uint32_t opt, |
| 696 | char **name, |
| 697 | uint32_t *id, |
| 698 | Error **errp) |
| 699 | { |
| 700 | int ret; |
| 701 | NBDOptionReply reply; |
| 702 | char *local_name = NULL; |
| 703 | uint32_t local_id; |
| 704 | |
| 705 | if (nbd_receive_option_reply(ioc, opt, &reply, errp) < 0) { |
| 706 | return -1; |
| 707 | } |
| 708 | |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 709 | ret = nbd_handle_reply_err(ioc, &reply, false, errp); |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 710 | if (ret <= 0) { |
| 711 | return ret; |
| 712 | } |
| 713 | |
| 714 | if (reply.type == NBD_REP_ACK) { |
| 715 | if (reply.length != 0) { |
| 716 | error_setg(errp, "Unexpected length to ACK response"); |
| 717 | nbd_send_opt_abort(ioc); |
| 718 | return -1; |
| 719 | } |
| 720 | return 0; |
| 721 | } else if (reply.type != NBD_REP_META_CONTEXT) { |
| 722 | error_setg(errp, "Unexpected reply type %u (%s), expected %u (%s)", |
| 723 | reply.type, nbd_rep_lookup(reply.type), |
| 724 | NBD_REP_META_CONTEXT, nbd_rep_lookup(NBD_REP_META_CONTEXT)); |
| 725 | nbd_send_opt_abort(ioc); |
| 726 | return -1; |
| 727 | } |
| 728 | |
| 729 | if (reply.length <= sizeof(local_id) || |
| 730 | reply.length > NBD_MAX_BUFFER_SIZE) { |
| 731 | error_setg(errp, "Failed to negotiate meta context, server " |
| 732 | "answered with unexpected length %" PRIu32, |
| 733 | reply.length); |
| 734 | nbd_send_opt_abort(ioc); |
| 735 | return -1; |
| 736 | } |
| 737 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 738 | if (nbd_read32(ioc, &local_id, "context id", errp) < 0) { |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 739 | return -1; |
| 740 | } |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 741 | |
| 742 | reply.length -= sizeof(local_id); |
| 743 | local_name = g_malloc(reply.length + 1); |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 744 | if (nbd_read(ioc, local_name, reply.length, "context name", errp) < 0) { |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 745 | g_free(local_name); |
| 746 | return -1; |
| 747 | } |
| 748 | local_name[reply.length] = '\0'; |
| 749 | trace_nbd_opt_meta_reply(nbd_opt_lookup(opt), local_name, local_id); |
| 750 | |
| 751 | if (name) { |
| 752 | *name = local_name; |
| 753 | } else { |
| 754 | g_free(local_name); |
| 755 | } |
| 756 | if (id) { |
| 757 | *id = local_id; |
| 758 | } |
| 759 | return 1; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * nbd_negotiate_simple_meta_context: |
Eric Blake | 2df94eb | 2019-01-17 13:36:47 -0600 | [diff] [blame] | 764 | * Request the server to set the meta context for export @info->name |
| 765 | * using @info->x_dirty_bitmap with a fallback to "base:allocation", |
| 766 | * setting @info->context_id to the resulting id. Fail if the server |
| 767 | * responds with more than one context or with a context different |
| 768 | * than the query. |
| 769 | * return 1 for successful negotiation, |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 770 | * 0 if operation is unsupported, |
| 771 | * -1 with errp set for any other error |
| 772 | */ |
| 773 | static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, |
Eric Blake | 2df94eb | 2019-01-17 13:36:47 -0600 | [diff] [blame] | 774 | NBDExportInfo *info, |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 775 | Error **errp) |
| 776 | { |
Eric Blake | 2df94eb | 2019-01-17 13:36:47 -0600 | [diff] [blame] | 777 | /* |
| 778 | * TODO: Removing the x_dirty_bitmap hack will mean refactoring |
| 779 | * this function to request and store ids for multiple contexts |
| 780 | * (both base:allocation and a dirty bitmap), at which point this |
| 781 | * function should lose the term _simple. |
| 782 | */ |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 783 | int ret; |
Eric Blake | 2df94eb | 2019-01-17 13:36:47 -0600 | [diff] [blame] | 784 | const char *context = info->x_dirty_bitmap ?: "base:allocation"; |
Vladimir Sementsov-Ogievskiy | 89aa0d8 | 2018-04-27 17:20:01 +0300 | [diff] [blame] | 785 | bool received = false; |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 786 | char *name = NULL; |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 787 | |
Eric Blake | 757b3ab | 2019-01-17 13:36:48 -0600 | [diff] [blame] | 788 | if (nbd_send_meta_query(ioc, NBD_OPT_SET_META_CONTEXT, |
| 789 | info->name, context, errp) < 0) { |
| 790 | return -1; |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 791 | } |
| 792 | |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 793 | ret = nbd_receive_one_meta_context(ioc, NBD_OPT_SET_META_CONTEXT, |
| 794 | &name, &info->context_id, errp); |
| 795 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 796 | return -1; |
| 797 | } |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 798 | if (ret == 1) { |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 799 | if (strcmp(context, name)) { |
| 800 | error_setg(errp, "Failed to negotiate meta context '%s', server " |
| 801 | "answered with different context '%s'", context, |
| 802 | name); |
| 803 | g_free(name); |
Eric Blake | 260e34d | 2018-03-29 18:18:37 -0500 | [diff] [blame] | 804 | nbd_send_opt_abort(ioc); |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 805 | return -1; |
| 806 | } |
| 807 | g_free(name); |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 808 | received = true; |
| 809 | |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 810 | ret = nbd_receive_one_meta_context(ioc, NBD_OPT_SET_META_CONTEXT, |
| 811 | NULL, NULL, errp); |
| 812 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 813 | return -1; |
| 814 | } |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 815 | } |
Eric Blake | 0182c1a | 2019-01-17 13:36:49 -0600 | [diff] [blame] | 816 | if (ret != 0) { |
| 817 | error_setg(errp, "Server answered with more than one context"); |
Eric Blake | 260e34d | 2018-03-29 18:18:37 -0500 | [diff] [blame] | 818 | nbd_send_opt_abort(ioc); |
| 819 | return -1; |
| 820 | } |
Eric Blake | 2df94eb | 2019-01-17 13:36:47 -0600 | [diff] [blame] | 821 | return received; |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 822 | } |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 823 | |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 824 | /* |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 825 | * nbd_list_meta_contexts: |
| 826 | * Request the server to list all meta contexts for export @info->name. |
| 827 | * return 0 if list is complete (even if empty), |
| 828 | * -1 with errp set for any error |
| 829 | */ |
| 830 | static int nbd_list_meta_contexts(QIOChannel *ioc, |
| 831 | NBDExportInfo *info, |
| 832 | Error **errp) |
| 833 | { |
| 834 | int ret; |
Eric Blake | 7c6f5dd | 2019-01-17 13:36:57 -0600 | [diff] [blame] | 835 | int seen_any = false; |
| 836 | int seen_qemu = false; |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 837 | |
| 838 | if (nbd_send_meta_query(ioc, NBD_OPT_LIST_META_CONTEXT, |
| 839 | info->name, NULL, errp) < 0) { |
| 840 | return -1; |
| 841 | } |
| 842 | |
| 843 | while (1) { |
| 844 | char *context; |
| 845 | |
| 846 | ret = nbd_receive_one_meta_context(ioc, NBD_OPT_LIST_META_CONTEXT, |
| 847 | &context, NULL, errp); |
Eric Blake | 7c6f5dd | 2019-01-17 13:36:57 -0600 | [diff] [blame] | 848 | if (ret == 0 && seen_any && !seen_qemu) { |
| 849 | /* |
| 850 | * Work around qemu 3.0 bug: the server forgot to send |
| 851 | * "qemu:" replies to 0 queries. If we saw at least one |
| 852 | * reply (probably base:allocation), but none of them were |
| 853 | * qemu:, then run a more specific query to make sure. |
| 854 | */ |
| 855 | seen_qemu = true; |
| 856 | if (nbd_send_meta_query(ioc, NBD_OPT_LIST_META_CONTEXT, |
| 857 | info->name, "qemu:", errp) < 0) { |
| 858 | return -1; |
| 859 | } |
| 860 | continue; |
| 861 | } |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 862 | if (ret <= 0) { |
| 863 | return ret; |
| 864 | } |
Eric Blake | 7c6f5dd | 2019-01-17 13:36:57 -0600 | [diff] [blame] | 865 | seen_any = true; |
| 866 | seen_qemu |= strstart(context, "qemu:", NULL); |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 867 | info->contexts = g_renew(char *, info->contexts, ++info->n_contexts); |
| 868 | info->contexts[info->n_contexts - 1] = context; |
| 869 | } |
| 870 | } |
| 871 | |
| 872 | /* |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 873 | * nbd_start_negotiate: |
| 874 | * Start the handshake to the server. After a positive return, the server |
| 875 | * is ready to accept additional NBD_OPT requests. |
| 876 | * Returns: negative errno: failure talking to server |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 877 | * 0: server is oldstyle, must call nbd_negotiate_finish_oldstyle |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 878 | * 1: server is newstyle, but can only accept EXPORT_NAME |
| 879 | * 2: server is newstyle, but lacks structured replies |
| 880 | * 3: server is newstyle and set up for structured replies |
| 881 | */ |
Vladimir Sementsov-Ogievskiy | a8e2bb6 | 2019-06-18 14:43:21 +0300 | [diff] [blame] | 882 | static int nbd_start_negotiate(AioContext *aio_context, QIOChannel *ioc, |
| 883 | QCryptoTLSCreds *tlscreds, |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 884 | const char *hostname, QIOChannel **outioc, |
| 885 | bool structured_reply, bool *zeroes, |
| 886 | Error **errp) |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 887 | { |
Vladimir Sementsov-Ogievskiy | 795d946 | 2020-07-07 18:50:36 +0200 | [diff] [blame] | 888 | ERRP_GUARD(); |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 889 | uint64_t magic; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 890 | |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 891 | trace_nbd_start_negotiate(tlscreds, hostname ? hostname : "<null>"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 892 | |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 893 | if (zeroes) { |
| 894 | *zeroes = true; |
| 895 | } |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 896 | if (outioc) { |
| 897 | *outioc = NULL; |
| 898 | } |
| 899 | if (tlscreds && !outioc) { |
| 900 | error_setg(errp, "Output I/O channel required for TLS"); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 901 | return -EINVAL; |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 902 | } |
| 903 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 904 | if (nbd_read64(ioc, &magic, "initial magic", errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 905 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 906 | } |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 907 | trace_nbd_receive_negotiate_magic(magic); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 908 | |
Eric Blake | ef2e35f | 2018-12-15 07:53:10 -0600 | [diff] [blame] | 909 | if (magic != NBD_INIT_MAGIC) { |
| 910 | error_setg(errp, "Bad initial magic received: 0x%" PRIx64, magic); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 911 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 912 | } |
| 913 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 914 | if (nbd_read64(ioc, &magic, "server magic", errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 915 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 916 | } |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 917 | trace_nbd_receive_negotiate_magic(magic); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 918 | |
Daniel P. Berrange | f72d705 | 2016-02-10 18:41:05 +0000 | [diff] [blame] | 919 | if (magic == NBD_OPTS_MAGIC) { |
Daniel P. Berrange | e2a9d9a | 2016-02-10 18:41:07 +0000 | [diff] [blame] | 920 | uint32_t clientflags = 0; |
Daniel P. Berrange | e2a9d9a | 2016-02-10 18:41:07 +0000 | [diff] [blame] | 921 | uint16_t globalflags; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 922 | bool fixedNewStyle = false; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 923 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 924 | if (nbd_read16(ioc, &globalflags, "server flags", errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 925 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 926 | } |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 927 | trace_nbd_receive_negotiate_server_flags(globalflags); |
Daniel P. Berrange | e2a9d9a | 2016-02-10 18:41:07 +0000 | [diff] [blame] | 928 | if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) { |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 929 | fixedNewStyle = true; |
Daniel P. Berrange | e2a9d9a | 2016-02-10 18:41:07 +0000 | [diff] [blame] | 930 | clientflags |= NBD_FLAG_C_FIXED_NEWSTYLE; |
| 931 | } |
Eric Blake | c203c59 | 2016-10-14 13:33:14 -0500 | [diff] [blame] | 932 | if (globalflags & NBD_FLAG_NO_ZEROES) { |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 933 | if (zeroes) { |
| 934 | *zeroes = false; |
| 935 | } |
Eric Blake | c203c59 | 2016-10-14 13:33:14 -0500 | [diff] [blame] | 936 | clientflags |= NBD_FLAG_C_NO_ZEROES; |
| 937 | } |
Daniel P. Berrange | e2a9d9a | 2016-02-10 18:41:07 +0000 | [diff] [blame] | 938 | /* client requested flags */ |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 939 | clientflags = cpu_to_be32(clientflags); |
Vladimir Sementsov-Ogievskiy | d1fdf25 | 2017-06-02 18:01:39 +0300 | [diff] [blame] | 940 | if (nbd_write(ioc, &clientflags, sizeof(clientflags), errp) < 0) { |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 941 | error_prepend(errp, "Failed to send clientflags field: "); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 942 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 943 | } |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 944 | if (tlscreds) { |
| 945 | if (fixedNewStyle) { |
| 946 | *outioc = nbd_receive_starttls(ioc, tlscreds, hostname, errp); |
| 947 | if (!*outioc) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 948 | return -EINVAL; |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 949 | } |
| 950 | ioc = *outioc; |
Vladimir Sementsov-Ogievskiy | a8e2bb6 | 2019-06-18 14:43:21 +0300 | [diff] [blame] | 951 | if (aio_context) { |
| 952 | qio_channel_set_blocking(ioc, false, NULL); |
| 953 | qio_channel_attach_aio_context(ioc, aio_context); |
| 954 | } |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 955 | } else { |
| 956 | error_setg(errp, "Server does not support STARTTLS"); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 957 | return -EINVAL; |
Daniel P. Berrange | f95910f | 2016-02-10 18:41:11 +0000 | [diff] [blame] | 958 | } |
| 959 | } |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 960 | if (fixedNewStyle) { |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 961 | int result = 0; |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 962 | |
Vladimir Sementsov-Ogievskiy | f140e30 | 2017-10-27 12:40:37 +0200 | [diff] [blame] | 963 | if (structured_reply) { |
| 964 | result = nbd_request_simple_option(ioc, |
| 965 | NBD_OPT_STRUCTURED_REPLY, |
Eric Blake | 5de4773 | 2019-08-24 12:28:13 -0500 | [diff] [blame] | 966 | false, errp); |
Vladimir Sementsov-Ogievskiy | f140e30 | 2017-10-27 12:40:37 +0200 | [diff] [blame] | 967 | if (result < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 968 | return -EINVAL; |
Vladimir Sementsov-Ogievskiy | f140e30 | 2017-10-27 12:40:37 +0200 | [diff] [blame] | 969 | } |
Vladimir Sementsov-Ogievskiy | f140e30 | 2017-10-27 12:40:37 +0200 | [diff] [blame] | 970 | } |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 971 | return 2 + result; |
| 972 | } else { |
| 973 | return 1; |
| 974 | } |
| 975 | } else if (magic == NBD_CLIENT_MAGIC) { |
| 976 | if (tlscreds) { |
| 977 | error_setg(errp, "Server does not support STARTTLS"); |
| 978 | return -EINVAL; |
| 979 | } |
| 980 | return 0; |
| 981 | } else { |
| 982 | error_setg(errp, "Bad server magic received: 0x%" PRIx64, magic); |
| 983 | return -EINVAL; |
| 984 | } |
| 985 | } |
Vladimir Sementsov-Ogievskiy | f140e30 | 2017-10-27 12:40:37 +0200 | [diff] [blame] | 986 | |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 987 | /* |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 988 | * nbd_negotiate_finish_oldstyle: |
| 989 | * Populate @info with the size and export flags from an oldstyle server, |
| 990 | * but does not consume 124 bytes of reserved zero padding. |
| 991 | * Returns 0 on success, -1 with @errp set on failure |
| 992 | */ |
| 993 | static int nbd_negotiate_finish_oldstyle(QIOChannel *ioc, NBDExportInfo *info, |
| 994 | Error **errp) |
| 995 | { |
| 996 | uint32_t oldflags; |
| 997 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 998 | if (nbd_read64(ioc, &info->size, "export length", errp) < 0) { |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 999 | return -EINVAL; |
| 1000 | } |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 1001 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 1002 | if (nbd_read32(ioc, &oldflags, "export flags", errp) < 0) { |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 1003 | return -EINVAL; |
| 1004 | } |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 1005 | if (oldflags & ~0xffff) { |
| 1006 | error_setg(errp, "Unexpected export flags %0x" PRIx32, oldflags); |
| 1007 | return -EINVAL; |
| 1008 | } |
| 1009 | info->flags = oldflags; |
| 1010 | return 0; |
| 1011 | } |
| 1012 | |
| 1013 | /* |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1014 | * nbd_receive_negotiate: |
| 1015 | * Connect to server, complete negotiation, and move into transmission phase. |
| 1016 | * Returns: negative errno: failure talking to server |
| 1017 | * 0: server is connected |
| 1018 | */ |
Vladimir Sementsov-Ogievskiy | a8e2bb6 | 2019-06-18 14:43:21 +0300 | [diff] [blame] | 1019 | int nbd_receive_negotiate(AioContext *aio_context, QIOChannel *ioc, |
| 1020 | QCryptoTLSCreds *tlscreds, |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1021 | const char *hostname, QIOChannel **outioc, |
| 1022 | NBDExportInfo *info, Error **errp) |
| 1023 | { |
Vladimir Sementsov-Ogievskiy | 795d946 | 2020-07-07 18:50:36 +0200 | [diff] [blame] | 1024 | ERRP_GUARD(); |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1025 | int result; |
| 1026 | bool zeroes; |
| 1027 | bool base_allocation = info->base_allocation; |
Vladimir Sementsov-Ogievskiy | 78a33ab | 2018-03-12 18:21:23 +0300 | [diff] [blame] | 1028 | |
Eric Blake | 93676c8 | 2019-11-13 20:46:34 -0600 | [diff] [blame] | 1029 | assert(info->name && strlen(info->name) <= NBD_MAX_STRING_SIZE); |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1030 | trace_nbd_receive_negotiate_name(info->name); |
| 1031 | |
Vladimir Sementsov-Ogievskiy | a8e2bb6 | 2019-06-18 14:43:21 +0300 | [diff] [blame] | 1032 | result = nbd_start_negotiate(aio_context, ioc, tlscreds, hostname, outioc, |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1033 | info->structured_reply, &zeroes, errp); |
| 1034 | |
| 1035 | info->structured_reply = false; |
| 1036 | info->base_allocation = false; |
| 1037 | if (tlscreds && *outioc) { |
| 1038 | ioc = *outioc; |
| 1039 | } |
| 1040 | |
| 1041 | switch (result) { |
| 1042 | case 3: /* newstyle, with structured replies */ |
| 1043 | info->structured_reply = true; |
| 1044 | if (base_allocation) { |
| 1045 | result = nbd_negotiate_simple_meta_context(ioc, info, errp); |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 1046 | if (result < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1047 | return -EINVAL; |
Eric Blake | 8ecaeae | 2017-07-07 15:30:47 -0500 | [diff] [blame] | 1048 | } |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1049 | info->base_allocation = result == 1; |
Daniel P. Berrange | 9344e5f | 2016-02-10 18:41:09 +0000 | [diff] [blame] | 1050 | } |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1051 | /* fall through */ |
| 1052 | case 2: /* newstyle, try OPT_GO */ |
| 1053 | /* Try NBD_OPT_GO first - if it works, we are done (it |
| 1054 | * also gives us a good message if the server requires |
| 1055 | * TLS). If it is not available, fall back to |
| 1056 | * NBD_OPT_LIST for nicer error messages about a missing |
| 1057 | * export, then use NBD_OPT_EXPORT_NAME. */ |
Eric Blake | 138796d | 2019-01-17 13:36:53 -0600 | [diff] [blame] | 1058 | result = nbd_opt_info_or_go(ioc, NBD_OPT_GO, info, errp); |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1059 | if (result < 0) { |
| 1060 | return -EINVAL; |
| 1061 | } |
| 1062 | if (result > 0) { |
| 1063 | return 0; |
| 1064 | } |
| 1065 | /* Check our desired export is present in the |
| 1066 | * server export list. Since NBD_OPT_EXPORT_NAME |
| 1067 | * cannot return an error message, running this |
| 1068 | * query gives us better error reporting if the |
| 1069 | * export name is not available. |
| 1070 | */ |
| 1071 | if (nbd_receive_query_exports(ioc, info->name, errp) < 0) { |
| 1072 | return -EINVAL; |
| 1073 | } |
| 1074 | /* fall through */ |
| 1075 | case 1: /* newstyle, but limited to EXPORT_NAME */ |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 1076 | /* write the export name request */ |
Eric Blake | 6dc1667 | 2019-01-17 13:36:46 -0600 | [diff] [blame] | 1077 | if (nbd_send_option_request(ioc, NBD_OPT_EXPORT_NAME, -1, info->name, |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 1078 | errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1079 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1080 | } |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1081 | |
Eric Blake | c8a3a1b | 2016-10-14 13:33:10 -0500 | [diff] [blame] | 1082 | /* Read the response */ |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 1083 | if (nbd_read64(ioc, &info->size, "export length", errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1084 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1085 | } |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1086 | |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 1087 | if (nbd_read16(ioc, &info->flags, "export flags", errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1088 | return -EINVAL; |
Daniel P. Berrange | f72d705 | 2016-02-10 18:41:05 +0000 | [diff] [blame] | 1089 | } |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1090 | break; |
| 1091 | case 0: /* oldstyle, parse length and flags */ |
Eric Blake | 6dc1667 | 2019-01-17 13:36:46 -0600 | [diff] [blame] | 1092 | if (*info->name) { |
| 1093 | error_setg(errp, "Server does not support non-empty export names"); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1094 | return -EINVAL; |
Daniel P. Berrange | f72d705 | 2016-02-10 18:41:05 +0000 | [diff] [blame] | 1095 | } |
Eric Blake | b3c9d33 | 2019-01-17 13:36:52 -0600 | [diff] [blame] | 1096 | if (nbd_negotiate_finish_oldstyle(ioc, info, errp) < 0) { |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1097 | return -EINVAL; |
Daniel P. Berrange | f72d705 | 2016-02-10 18:41:05 +0000 | [diff] [blame] | 1098 | } |
Eric Blake | 10b8998 | 2019-01-17 13:36:51 -0600 | [diff] [blame] | 1099 | break; |
| 1100 | default: |
| 1101 | return result; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1102 | } |
Daniel P. Berrange | f72d705 | 2016-02-10 18:41:05 +0000 | [diff] [blame] | 1103 | |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 1104 | trace_nbd_receive_negotiate_size_flags(info->size, info->flags); |
Vladimir Sementsov-Ogievskiy | d1fdf25 | 2017-06-02 18:01:39 +0300 | [diff] [blame] | 1105 | if (zeroes && nbd_drop(ioc, 124, errp) < 0) { |
Eric Blake | cb6b1a3 | 2017-11-13 09:24:24 -0600 | [diff] [blame] | 1106 | error_prepend(errp, "Failed to read reserved block: "); |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1107 | return -EINVAL; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1108 | } |
Eric Blake | 2b8d095 | 2019-01-17 13:36:50 -0600 | [diff] [blame] | 1109 | return 0; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1110 | } |
| 1111 | |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 1112 | /* Clean up result of nbd_receive_export_list */ |
| 1113 | void nbd_free_export_list(NBDExportInfo *info, int count) |
| 1114 | { |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 1115 | int i, j; |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 1116 | |
| 1117 | if (!info) { |
| 1118 | return; |
| 1119 | } |
| 1120 | |
| 1121 | for (i = 0; i < count; i++) { |
| 1122 | g_free(info[i].name); |
| 1123 | g_free(info[i].description); |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 1124 | for (j = 0; j < info[i].n_contexts; j++) { |
| 1125 | g_free(info[i].contexts[j]); |
| 1126 | } |
| 1127 | g_free(info[i].contexts); |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 1128 | } |
| 1129 | g_free(info); |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * nbd_receive_export_list: |
| 1134 | * Query details about a server's exports, then disconnect without |
| 1135 | * going into transmission phase. Return a count of the exports listed |
| 1136 | * in @info by the server, or -1 on error. Caller must free @info using |
| 1137 | * nbd_free_export_list(). |
| 1138 | */ |
| 1139 | int nbd_receive_export_list(QIOChannel *ioc, QCryptoTLSCreds *tlscreds, |
| 1140 | const char *hostname, NBDExportInfo **info, |
| 1141 | Error **errp) |
| 1142 | { |
| 1143 | int result; |
| 1144 | int count = 0; |
| 1145 | int i; |
| 1146 | int rc; |
| 1147 | int ret = -1; |
| 1148 | NBDExportInfo *array = NULL; |
| 1149 | QIOChannel *sioc = NULL; |
| 1150 | |
| 1151 | *info = NULL; |
Vladimir Sementsov-Ogievskiy | a8e2bb6 | 2019-06-18 14:43:21 +0300 | [diff] [blame] | 1152 | result = nbd_start_negotiate(NULL, ioc, tlscreds, hostname, &sioc, true, |
| 1153 | NULL, errp); |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 1154 | if (tlscreds && sioc) { |
| 1155 | ioc = sioc; |
| 1156 | } |
| 1157 | |
| 1158 | switch (result) { |
| 1159 | case 2: |
| 1160 | case 3: |
| 1161 | /* newstyle - use NBD_OPT_LIST to populate array, then try |
| 1162 | * NBD_OPT_INFO on each array member. If structured replies |
| 1163 | * are enabled, also try NBD_OPT_LIST_META_CONTEXT. */ |
| 1164 | if (nbd_send_option_request(ioc, NBD_OPT_LIST, 0, NULL, errp) < 0) { |
| 1165 | goto out; |
| 1166 | } |
| 1167 | while (1) { |
| 1168 | char *name; |
| 1169 | char *desc; |
| 1170 | |
| 1171 | rc = nbd_receive_list(ioc, &name, &desc, errp); |
| 1172 | if (rc < 0) { |
| 1173 | goto out; |
| 1174 | } else if (rc == 0) { |
| 1175 | break; |
| 1176 | } |
| 1177 | array = g_renew(NBDExportInfo, array, ++count); |
| 1178 | memset(&array[count - 1], 0, sizeof(*array)); |
| 1179 | array[count - 1].name = name; |
| 1180 | array[count - 1].description = desc; |
| 1181 | array[count - 1].structured_reply = result == 3; |
| 1182 | } |
| 1183 | |
| 1184 | for (i = 0; i < count; i++) { |
| 1185 | array[i].request_sizes = true; |
| 1186 | rc = nbd_opt_info_or_go(ioc, NBD_OPT_INFO, &array[i], errp); |
| 1187 | if (rc < 0) { |
| 1188 | goto out; |
| 1189 | } else if (rc == 0) { |
| 1190 | /* |
| 1191 | * Pointless to try rest of loop. If OPT_INFO doesn't work, |
| 1192 | * it's unlikely that meta contexts work either |
| 1193 | */ |
| 1194 | break; |
| 1195 | } |
| 1196 | |
Eric Blake | 0b576b6 | 2019-01-17 13:36:55 -0600 | [diff] [blame] | 1197 | if (result == 3 && |
| 1198 | nbd_list_meta_contexts(ioc, &array[i], errp) < 0) { |
| 1199 | goto out; |
| 1200 | } |
Eric Blake | d21a2d3 | 2019-01-17 13:36:54 -0600 | [diff] [blame] | 1201 | } |
| 1202 | |
| 1203 | /* Send NBD_OPT_ABORT as a courtesy before hanging up */ |
| 1204 | nbd_send_opt_abort(ioc); |
| 1205 | break; |
| 1206 | case 1: /* newstyle, but limited to EXPORT_NAME */ |
| 1207 | error_setg(errp, "Server does not support export lists"); |
| 1208 | /* We can't even send NBD_OPT_ABORT, so merely hang up */ |
| 1209 | goto out; |
| 1210 | case 0: /* oldstyle, parse length and flags */ |
| 1211 | array = g_new0(NBDExportInfo, 1); |
| 1212 | array->name = g_strdup(""); |
| 1213 | count = 1; |
| 1214 | |
| 1215 | if (nbd_negotiate_finish_oldstyle(ioc, array, errp) < 0) { |
| 1216 | goto out; |
| 1217 | } |
| 1218 | |
| 1219 | /* Send NBD_CMD_DISC as a courtesy to the server, but ignore all |
| 1220 | * errors now that we have the information we wanted. */ |
| 1221 | if (nbd_drop(ioc, 124, NULL) == 0) { |
| 1222 | NBDRequest request = { .type = NBD_CMD_DISC }; |
| 1223 | |
| 1224 | nbd_send_request(ioc, &request); |
| 1225 | } |
| 1226 | break; |
| 1227 | default: |
| 1228 | goto out; |
| 1229 | } |
| 1230 | |
| 1231 | *info = array; |
| 1232 | array = NULL; |
| 1233 | ret = count; |
| 1234 | |
| 1235 | out: |
| 1236 | qio_channel_shutdown(ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| 1237 | qio_channel_close(ioc, NULL); |
| 1238 | object_unref(OBJECT(sioc)); |
| 1239 | nbd_free_export_list(array, count); |
| 1240 | return ret; |
| 1241 | } |
| 1242 | |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1243 | #ifdef __linux__ |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 1244 | int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info, |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1245 | Error **errp) |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1246 | { |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 1247 | unsigned long sector_size = MAX(BDRV_SECTOR_SIZE, info->min_block); |
| 1248 | unsigned long sectors = info->size / sector_size; |
| 1249 | |
| 1250 | /* FIXME: Once the kernel module is patched to honor block sizes, |
| 1251 | * and to advertise that fact to user space, we should update the |
| 1252 | * hand-off to the kernel to use any block sizes we learned. */ |
| 1253 | assert(!info->request_sizes); |
| 1254 | if (info->size / sector_size != sectors) { |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 1255 | error_setg(errp, "Export size %" PRIu64 " too large for 32-bit kernel", |
| 1256 | info->size); |
Eric Blake | f57e241 | 2016-05-11 16:39:40 -0600 | [diff] [blame] | 1257 | return -E2BIG; |
| 1258 | } |
| 1259 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1260 | trace_nbd_init_set_socket(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1261 | |
Eric Blake | f57e241 | 2016-05-11 16:39:40 -0600 | [diff] [blame] | 1262 | if (ioctl(fd, NBD_SET_SOCK, (unsigned long) sioc->fd) < 0) { |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1263 | int serrno = errno; |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1264 | error_setg(errp, "Failed to set NBD socket"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1265 | return -serrno; |
| 1266 | } |
| 1267 | |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 1268 | trace_nbd_init_set_block_size(sector_size); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1269 | |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 1270 | if (ioctl(fd, NBD_SET_BLKSIZE, sector_size) < 0) { |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1271 | int serrno = errno; |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1272 | error_setg(errp, "Failed setting NBD block size"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1273 | return -serrno; |
| 1274 | } |
| 1275 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1276 | trace_nbd_init_set_size(sectors); |
Eric Blake | 081dd1f | 2017-07-07 15:30:49 -0500 | [diff] [blame] | 1277 | if (info->size % sector_size) { |
| 1278 | trace_nbd_init_trailing_bytes(info->size % sector_size); |
Eric Blake | f57e241 | 2016-05-11 16:39:40 -0600 | [diff] [blame] | 1279 | } |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1280 | |
Eric Blake | f57e241 | 2016-05-11 16:39:40 -0600 | [diff] [blame] | 1281 | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, sectors) < 0) { |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1282 | int serrno = errno; |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1283 | error_setg(errp, "Failed setting size (in blocks)"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1284 | return -serrno; |
| 1285 | } |
| 1286 | |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 1287 | if (ioctl(fd, NBD_SET_FLAGS, (unsigned long) info->flags) < 0) { |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1288 | if (errno == ENOTTY) { |
Eric Blake | 004a89f | 2017-07-07 15:30:41 -0500 | [diff] [blame] | 1289 | int read_only = (info->flags & NBD_FLAG_READ_ONLY) != 0; |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1290 | trace_nbd_init_set_readonly(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1291 | |
| 1292 | if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) { |
| 1293 | int serrno = errno; |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1294 | error_setg(errp, "Failed setting read-only attribute"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1295 | return -serrno; |
| 1296 | } |
| 1297 | } else { |
| 1298 | int serrno = errno; |
Vladimir Sementsov-Ogievskiy | be41c10 | 2017-05-26 14:09:13 +0300 | [diff] [blame] | 1299 | error_setg(errp, "Failed setting flags"); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1300 | return -serrno; |
| 1301 | } |
| 1302 | } |
| 1303 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1304 | trace_nbd_init_finish(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1305 | |
| 1306 | return 0; |
| 1307 | } |
| 1308 | |
| 1309 | int nbd_client(int fd) |
| 1310 | { |
| 1311 | int ret; |
| 1312 | int serrno; |
| 1313 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1314 | trace_nbd_client_loop(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1315 | |
| 1316 | ret = ioctl(fd, NBD_DO_IT); |
| 1317 | if (ret < 0 && errno == EPIPE) { |
| 1318 | /* NBD_DO_IT normally returns EPIPE when someone has disconnected |
| 1319 | * the socket via NBD_DISCONNECT. We do not want to return 1 in |
| 1320 | * that case. |
| 1321 | */ |
| 1322 | ret = 0; |
| 1323 | } |
| 1324 | serrno = errno; |
| 1325 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1326 | trace_nbd_client_loop_ret(ret, strerror(serrno)); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1327 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1328 | trace_nbd_client_clear_queue(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1329 | ioctl(fd, NBD_CLEAR_QUE); |
| 1330 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1331 | trace_nbd_client_clear_socket(); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1332 | ioctl(fd, NBD_CLEAR_SOCK); |
| 1333 | |
| 1334 | errno = serrno; |
| 1335 | return ret; |
| 1336 | } |
Eric Blake | 98494e3 | 2016-05-11 16:39:39 -0600 | [diff] [blame] | 1337 | |
| 1338 | int nbd_disconnect(int fd) |
| 1339 | { |
| 1340 | ioctl(fd, NBD_CLEAR_QUE); |
| 1341 | ioctl(fd, NBD_DISCONNECT); |
| 1342 | ioctl(fd, NBD_CLEAR_SOCK); |
| 1343 | return 0; |
| 1344 | } |
| 1345 | |
Eric Blake | 3c1fa35 | 2018-12-15 07:53:08 -0600 | [diff] [blame] | 1346 | #endif /* __linux__ */ |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1347 | |
Vladimir Sementsov-Ogievskiy | 490dc5e | 2017-08-04 18:14:27 +0300 | [diff] [blame] | 1348 | int nbd_send_request(QIOChannel *ioc, NBDRequest *request) |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1349 | { |
| 1350 | uint8_t buf[NBD_REQUEST_SIZE]; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1351 | |
Vladimir Sementsov-Ogievskiy | 9588463 | 2017-07-07 18:29:18 +0300 | [diff] [blame] | 1352 | trace_nbd_send_request(request->from, request->len, request->handle, |
Eric Blake | 48000eb | 2017-07-17 14:26:34 -0500 | [diff] [blame] | 1353 | request->flags, request->type, |
| 1354 | nbd_cmd_lookup(request->type)); |
Eric Blake | 7548fe3 | 2016-04-05 21:35:04 -0600 | [diff] [blame] | 1355 | |
Peter Maydell | f6be672 | 2016-06-10 17:15:42 +0100 | [diff] [blame] | 1356 | stl_be_p(buf, NBD_REQUEST_MAGIC); |
Eric Blake | b626b51 | 2016-10-14 13:33:04 -0500 | [diff] [blame] | 1357 | stw_be_p(buf + 4, request->flags); |
| 1358 | stw_be_p(buf + 6, request->type); |
Peter Maydell | f6be672 | 2016-06-10 17:15:42 +0100 | [diff] [blame] | 1359 | stq_be_p(buf + 8, request->handle); |
| 1360 | stq_be_p(buf + 16, request->from); |
| 1361 | stl_be_p(buf + 24, request->len); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1362 | |
Vladimir Sementsov-Ogievskiy | d1fdf25 | 2017-06-02 18:01:39 +0300 | [diff] [blame] | 1363 | return nbd_write(ioc, buf, sizeof(buf), NULL); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1364 | } |
| 1365 | |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1366 | /* nbd_receive_simple_reply |
| 1367 | * Read simple reply except magic field (which should be already read). |
| 1368 | * Payload is not read (payload is possible for CMD_READ, but here we even |
| 1369 | * don't know whether it take place or not). |
| 1370 | */ |
| 1371 | static int nbd_receive_simple_reply(QIOChannel *ioc, NBDSimpleReply *reply, |
| 1372 | Error **errp) |
| 1373 | { |
| 1374 | int ret; |
| 1375 | |
| 1376 | assert(reply->magic == NBD_SIMPLE_REPLY_MAGIC); |
| 1377 | |
| 1378 | ret = nbd_read(ioc, (uint8_t *)reply + sizeof(reply->magic), |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 1379 | sizeof(*reply) - sizeof(reply->magic), "reply", errp); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1380 | if (ret < 0) { |
| 1381 | return ret; |
| 1382 | } |
| 1383 | |
Peter Maydell | 80c7c2b | 2018-09-27 17:42:00 +0100 | [diff] [blame] | 1384 | reply->error = be32_to_cpu(reply->error); |
| 1385 | reply->handle = be64_to_cpu(reply->handle); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1386 | |
| 1387 | return 0; |
| 1388 | } |
| 1389 | |
| 1390 | /* nbd_receive_structured_reply_chunk |
| 1391 | * Read structured reply chunk except magic field (which should be already |
| 1392 | * read). |
| 1393 | * Payload is not read. |
| 1394 | */ |
| 1395 | static int nbd_receive_structured_reply_chunk(QIOChannel *ioc, |
| 1396 | NBDStructuredReplyChunk *chunk, |
| 1397 | Error **errp) |
| 1398 | { |
| 1399 | int ret; |
| 1400 | |
| 1401 | assert(chunk->magic == NBD_STRUCTURED_REPLY_MAGIC); |
| 1402 | |
| 1403 | ret = nbd_read(ioc, (uint8_t *)chunk + sizeof(chunk->magic), |
Vladimir Sementsov-Ogievskiy | e6798f0 | 2019-01-28 19:58:30 +0300 | [diff] [blame] | 1404 | sizeof(*chunk) - sizeof(chunk->magic), "structured chunk", |
| 1405 | errp); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1406 | if (ret < 0) { |
| 1407 | return ret; |
| 1408 | } |
| 1409 | |
Peter Maydell | 80c7c2b | 2018-09-27 17:42:00 +0100 | [diff] [blame] | 1410 | chunk->flags = be16_to_cpu(chunk->flags); |
| 1411 | chunk->type = be16_to_cpu(chunk->type); |
| 1412 | chunk->handle = be64_to_cpu(chunk->handle); |
| 1413 | chunk->length = be32_to_cpu(chunk->length); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1414 | |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
Kevin Wolf | a7b78fc | 2019-02-18 14:38:15 +0100 | [diff] [blame] | 1418 | /* nbd_read_eof |
| 1419 | * Tries to read @size bytes from @ioc. |
| 1420 | * Returns 1 on success |
| 1421 | * 0 on eof, when no data was read (errp is not set) |
| 1422 | * negative errno on failure (errp is set) |
| 1423 | */ |
| 1424 | static inline int coroutine_fn |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1425 | nbd_read_eof(BlockDriverState *bs, QIOChannel *ioc, void *buffer, size_t size, |
| 1426 | Error **errp) |
Kevin Wolf | a7b78fc | 2019-02-18 14:38:15 +0100 | [diff] [blame] | 1427 | { |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1428 | bool partial = false; |
Kevin Wolf | a7b78fc | 2019-02-18 14:38:15 +0100 | [diff] [blame] | 1429 | |
| 1430 | assert(size); |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1431 | while (size > 0) { |
| 1432 | struct iovec iov = { .iov_base = buffer, .iov_len = size }; |
| 1433 | ssize_t len; |
| 1434 | |
| 1435 | len = qio_channel_readv(ioc, &iov, 1, errp); |
| 1436 | if (len == QIO_CHANNEL_ERR_BLOCK) { |
| 1437 | bdrv_dec_in_flight(bs); |
| 1438 | qio_channel_yield(ioc, G_IO_IN); |
| 1439 | bdrv_inc_in_flight(bs); |
| 1440 | continue; |
| 1441 | } else if (len < 0) { |
| 1442 | return -EIO; |
| 1443 | } else if (len == 0) { |
| 1444 | if (partial) { |
| 1445 | error_setg(errp, |
| 1446 | "Unexpected end-of-file before all bytes were read"); |
| 1447 | return -EIO; |
| 1448 | } else { |
| 1449 | return 0; |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | partial = true; |
| 1454 | size -= len; |
| 1455 | buffer = (uint8_t*) buffer + len; |
Kevin Wolf | a7b78fc | 2019-02-18 14:38:15 +0100 | [diff] [blame] | 1456 | } |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1457 | return 1; |
Kevin Wolf | a7b78fc | 2019-02-18 14:38:15 +0100 | [diff] [blame] | 1458 | } |
| 1459 | |
Vladimir Sementsov-Ogievskiy | ba84564 | 2017-08-04 18:14:26 +0300 | [diff] [blame] | 1460 | /* nbd_receive_reply |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1461 | * |
| 1462 | * Decreases bs->in_flight while waiting for a new reply. This yield is where |
| 1463 | * we wait indefinitely and the coroutine must be able to be safely reentered |
| 1464 | * for nbd_client_attach_aio_context(). |
| 1465 | * |
Vladimir Sementsov-Ogievskiy | ba84564 | 2017-08-04 18:14:26 +0300 | [diff] [blame] | 1466 | * Returns 1 on success |
| 1467 | * 0 on eof, when no data was read (errp is not set) |
| 1468 | * negative errno on failure (errp is set) |
| 1469 | */ |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1470 | int coroutine_fn nbd_receive_reply(BlockDriverState *bs, QIOChannel *ioc, |
| 1471 | NBDReply *reply, Error **errp) |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1472 | { |
Vladimir Sementsov-Ogievskiy | ba84564 | 2017-08-04 18:14:26 +0300 | [diff] [blame] | 1473 | int ret; |
Eric Blake | 079d326 | 2017-11-08 15:56:59 -0600 | [diff] [blame] | 1474 | const char *type; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1475 | |
Kevin Wolf | d3bd5b9 | 2019-02-18 14:56:01 +0100 | [diff] [blame] | 1476 | ret = nbd_read_eof(bs, ioc, &reply->magic, sizeof(reply->magic), errp); |
Paolo Bonzini | ff82911 | 2017-02-13 14:52:24 +0100 | [diff] [blame] | 1477 | if (ret <= 0) { |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1478 | return ret; |
| 1479 | } |
| 1480 | |
Peter Maydell | 80c7c2b | 2018-09-27 17:42:00 +0100 | [diff] [blame] | 1481 | reply->magic = be32_to_cpu(reply->magic); |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1482 | |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1483 | switch (reply->magic) { |
| 1484 | case NBD_SIMPLE_REPLY_MAGIC: |
| 1485 | ret = nbd_receive_simple_reply(ioc, &reply->simple, errp); |
| 1486 | if (ret < 0) { |
| 1487 | break; |
| 1488 | } |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1489 | trace_nbd_receive_simple_reply(reply->simple.error, |
| 1490 | nbd_err_lookup(reply->simple.error), |
| 1491 | reply->handle); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1492 | break; |
| 1493 | case NBD_STRUCTURED_REPLY_MAGIC: |
| 1494 | ret = nbd_receive_structured_reply_chunk(ioc, &reply->structured, errp); |
| 1495 | if (ret < 0) { |
| 1496 | break; |
| 1497 | } |
Eric Blake | 079d326 | 2017-11-08 15:56:59 -0600 | [diff] [blame] | 1498 | type = nbd_reply_type_lookup(reply->structured.type); |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1499 | trace_nbd_receive_structured_reply_chunk(reply->structured.flags, |
Eric Blake | 079d326 | 2017-11-08 15:56:59 -0600 | [diff] [blame] | 1500 | reply->structured.type, type, |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1501 | reply->structured.handle, |
| 1502 | reply->structured.length); |
| 1503 | break; |
| 1504 | default: |
| 1505 | error_setg(errp, "invalid magic (got 0x%" PRIx32 ")", reply->magic); |
Eric Blake | b6f5d3b | 2016-10-14 13:33:16 -0500 | [diff] [blame] | 1506 | return -EINVAL; |
| 1507 | } |
Vladimir Sementsov-Ogievskiy | d2febed | 2017-10-27 12:40:35 +0200 | [diff] [blame] | 1508 | if (ret < 0) { |
| 1509 | return ret; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1510 | } |
Vladimir Sementsov-Ogievskiy | ba84564 | 2017-08-04 18:14:26 +0300 | [diff] [blame] | 1511 | |
| 1512 | return 1; |
Fam Zheng | 798bfe0 | 2016-01-14 16:41:02 +0800 | [diff] [blame] | 1513 | } |
| 1514 | |