mirror of https://gitee.com/openkylin/qemu.git
nbd/server: refactor negotiation functions parameters
Instead of passing currently negotiating option and its length to many of negotiation functions let's just store them on NBDClient struct to be state-variables of negotiation phase. This unifies semantics of negotiation functions and allows tracking changes of remaining option length in future patches. Asssert that optlen is back to 0 after negotiation (including old-style connections which don't negotiate), although we need more patches before we can assert optlen is 0 between options during negotiation. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20171122101958.17065-2-vsementsov@virtuozzo.com> [eblake: rebase, commit message tweak, assert !optlen after negotiation completes] Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy
Eric Blake
parent
a16a790770
commit
0cfae925d2
168
nbd/server.c
168
nbd/server.c
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@ -102,9 +102,11 @@ struct NBDClient {
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bool closing;
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bool structured_reply;
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};
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/* That's all folks */
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uint32_t opt; /* Current option being negotiated */
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uint32_t optlen; /* remaining length of data in ioc for the option being
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negotiated now */
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};
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static void nbd_client_receive_next_request(NBDClient *client);
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@ -137,10 +139,12 @@ static void nbd_client_receive_next_request(NBDClient *client);
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/* Send a reply header, including length, but no payload.
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* Return -errno on error, 0 on success. */
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static int nbd_negotiate_send_rep_len(QIOChannel *ioc, uint32_t type,
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uint32_t opt, uint32_t len, Error **errp)
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static int nbd_negotiate_send_rep_len(NBDClient *client, uint32_t type,
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uint32_t len, Error **errp)
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{
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uint64_t magic;
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QIOChannel *ioc = client->ioc;
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uint32_t opt = client->opt;
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trace_nbd_negotiate_send_rep_len(opt, nbd_opt_lookup(opt),
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type, nbd_rep_lookup(type), len);
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@ -174,17 +178,17 @@ static int nbd_negotiate_send_rep_len(QIOChannel *ioc, uint32_t type,
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/* Send a reply header with default 0 length.
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* Return -errno on error, 0 on success. */
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static int nbd_negotiate_send_rep(QIOChannel *ioc, uint32_t type, uint32_t opt,
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static int nbd_negotiate_send_rep(NBDClient *client, uint32_t type,
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Error **errp)
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{
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return nbd_negotiate_send_rep_len(ioc, type, opt, 0, errp);
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return nbd_negotiate_send_rep_len(client, type, 0, errp);
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}
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/* Send an error reply.
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* Return -errno on error, 0 on success. */
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static int GCC_FMT_ATTR(5, 6)
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nbd_negotiate_send_rep_err(QIOChannel *ioc, uint32_t type,
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uint32_t opt, Error **errp, const char *fmt, ...)
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static int GCC_FMT_ATTR(4, 5)
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nbd_negotiate_send_rep_err(NBDClient *client, uint32_t type,
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Error **errp, const char *fmt, ...)
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{
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va_list va;
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char *msg;
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@ -197,11 +201,11 @@ nbd_negotiate_send_rep_err(QIOChannel *ioc, uint32_t type,
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len = strlen(msg);
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assert(len < 4096);
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trace_nbd_negotiate_send_rep_err(msg);
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ret = nbd_negotiate_send_rep_len(ioc, type, opt, len, errp);
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ret = nbd_negotiate_send_rep_len(client, type, len, errp);
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if (ret < 0) {
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goto out;
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}
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if (nbd_write(ioc, msg, len, errp) < 0) {
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if (nbd_write(client->ioc, msg, len, errp) < 0) {
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error_prepend(errp, "write failed (error message): ");
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ret = -EIO;
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} else {
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@ -215,21 +219,21 @@ out:
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/* Send a single NBD_REP_SERVER reply to NBD_OPT_LIST, including payload.
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* Return -errno on error, 0 on success. */
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static int nbd_negotiate_send_rep_list(QIOChannel *ioc, NBDExport *exp,
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static int nbd_negotiate_send_rep_list(NBDClient *client, NBDExport *exp,
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Error **errp)
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{
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size_t name_len, desc_len;
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uint32_t len;
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const char *name = exp->name ? exp->name : "";
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const char *desc = exp->description ? exp->description : "";
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QIOChannel *ioc = client->ioc;
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int ret;
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trace_nbd_negotiate_send_rep_list(name, desc);
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name_len = strlen(name);
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desc_len = strlen(desc);
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len = name_len + desc_len + sizeof(len);
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ret = nbd_negotiate_send_rep_len(ioc, NBD_REP_SERVER, NBD_OPT_LIST, len,
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errp);
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ret = nbd_negotiate_send_rep_len(client, NBD_REP_SERVER, len, errp);
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if (ret < 0) {
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return ret;
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}
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@ -258,20 +262,21 @@ static int nbd_negotiate_send_rep_list(QIOChannel *ioc, NBDExport *exp,
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static int nbd_negotiate_handle_list(NBDClient *client, Error **errp)
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{
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NBDExport *exp;
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assert(client->opt == NBD_OPT_LIST);
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/* For each export, send a NBD_REP_SERVER reply. */
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QTAILQ_FOREACH(exp, &exports, next) {
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if (nbd_negotiate_send_rep_list(client->ioc, exp, errp)) {
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if (nbd_negotiate_send_rep_list(client, exp, errp)) {
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return -EINVAL;
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}
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}
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/* Finish with a NBD_REP_ACK. */
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return nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK, NBD_OPT_LIST, errp);
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return nbd_negotiate_send_rep(client, NBD_REP_ACK, errp);
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}
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/* Send a reply to NBD_OPT_EXPORT_NAME.
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* Return -errno on error, 0 on success. */
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static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length,
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static int nbd_negotiate_handle_export_name(NBDClient *client,
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uint16_t myflags, bool no_zeroes,
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Error **errp)
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{
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@ -288,15 +293,16 @@ static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length,
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[10 .. 133] reserved (0) [unless no_zeroes]
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*/
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trace_nbd_negotiate_handle_export_name();
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if (length >= sizeof(name)) {
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if (client->optlen >= sizeof(name)) {
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error_setg(errp, "Bad length received");
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return -EINVAL;
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}
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if (nbd_read(client->ioc, name, length, errp) < 0) {
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if (nbd_read(client->ioc, name, client->optlen, errp) < 0) {
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error_prepend(errp, "read failed: ");
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return -EINVAL;
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}
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name[length] = '\0';
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name[client->optlen] = '\0';
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client->optlen = 0;
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trace_nbd_negotiate_handle_export_name_request(name);
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@ -326,14 +332,14 @@ static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length,
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/* Send a single NBD_REP_INFO, with a buffer @buf of @length bytes.
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* The buffer does NOT include the info type prefix.
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* Return -errno on error, 0 if ready to send more. */
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static int nbd_negotiate_send_info(NBDClient *client, uint32_t opt,
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static int nbd_negotiate_send_info(NBDClient *client,
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uint16_t info, uint32_t length, void *buf,
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Error **errp)
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{
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int rc;
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trace_nbd_negotiate_send_info(info, nbd_info_lookup(info), length);
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rc = nbd_negotiate_send_rep_len(client->ioc, NBD_REP_INFO, opt,
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rc = nbd_negotiate_send_rep_len(client, NBD_REP_INFO,
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sizeof(info) + length, errp);
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if (rc < 0) {
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return rc;
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@ -355,22 +361,20 @@ static int nbd_negotiate_send_info(NBDClient *client, uint32_t opt,
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* -errno transmission error occurred or @fatal was requested, errp is set
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* 0 error message successfully sent to client, errp is not set
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*/
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static int nbd_reject_length(NBDClient *client, uint32_t length,
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uint32_t option, bool fatal, Error **errp)
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static int nbd_reject_length(NBDClient *client, bool fatal, Error **errp)
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{
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int ret;
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assert(length);
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if (nbd_drop(client->ioc, length, errp) < 0) {
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assert(client->optlen);
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if (nbd_drop(client->ioc, client->optlen, errp) < 0) {
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return -EIO;
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}
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ret = nbd_negotiate_send_rep_err(client->ioc, NBD_REP_ERR_INVALID,
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option, errp,
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ret = nbd_negotiate_send_rep_err(client, NBD_REP_ERR_INVALID, errp,
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"option '%s' should have zero length",
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nbd_opt_lookup(option));
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nbd_opt_lookup(client->opt));
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if (fatal && !ret) {
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error_setg(errp, "option '%s' should have zero length",
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nbd_opt_lookup(option));
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nbd_opt_lookup(client->opt));
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return -EINVAL;
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}
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return ret;
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@ -379,8 +383,7 @@ static int nbd_reject_length(NBDClient *client, uint32_t length,
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/* Handle NBD_OPT_INFO and NBD_OPT_GO.
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* Return -errno on error, 0 if ready for next option, and 1 to move
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* into transmission phase. */
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static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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uint32_t opt, uint16_t myflags,
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static int nbd_negotiate_handle_info(NBDClient *client, uint16_t myflags,
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Error **errp)
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{
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int rc;
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@ -401,7 +404,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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2 bytes: N, number of requests (can be 0)
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N * 2 bytes: N requests
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*/
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if (length < sizeof(namelen) + sizeof(requests)) {
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if (client->optlen < sizeof(namelen) + sizeof(requests)) {
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msg = "overall request too short";
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goto invalid;
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}
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@ -409,8 +412,10 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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return -EIO;
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}
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be32_to_cpus(&namelen);
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length -= sizeof(namelen);
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if (namelen > length - sizeof(requests) || (length - namelen) % 2) {
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client->optlen -= sizeof(namelen);
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if (namelen > client->optlen - sizeof(requests) ||
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(client->optlen - namelen) % 2)
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{
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msg = "name length is incorrect";
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goto invalid;
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}
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@ -422,16 +427,16 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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return -EIO;
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}
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name[namelen] = '\0';
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length -= namelen;
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client->optlen -= namelen;
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trace_nbd_negotiate_handle_export_name_request(name);
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if (nbd_read(client->ioc, &requests, sizeof(requests), errp) < 0) {
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return -EIO;
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}
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be16_to_cpus(&requests);
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length -= sizeof(requests);
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client->optlen -= sizeof(requests);
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trace_nbd_negotiate_handle_info_requests(requests);
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if (requests != length / sizeof(request)) {
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if (requests != client->optlen / sizeof(request)) {
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msg = "incorrect number of requests for overall length";
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goto invalid;
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}
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@ -440,7 +445,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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return -EIO;
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}
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be16_to_cpus(&request);
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length -= sizeof(request);
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client->optlen -= sizeof(request);
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trace_nbd_negotiate_handle_info_request(request,
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nbd_info_lookup(request));
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/* We care about NBD_INFO_NAME and NBD_INFO_BLOCK_SIZE;
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@ -455,18 +460,18 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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break;
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}
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}
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assert(length == 0);
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assert(client->optlen == 0);
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exp = nbd_export_find(name);
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if (!exp) {
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return nbd_negotiate_send_rep_err(client->ioc, NBD_REP_ERR_UNKNOWN,
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opt, errp, "export '%s' not present",
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return nbd_negotiate_send_rep_err(client, NBD_REP_ERR_UNKNOWN,
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errp, "export '%s' not present",
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name);
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}
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/* Don't bother sending NBD_INFO_NAME unless client requested it */
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if (sendname) {
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rc = nbd_negotiate_send_info(client, opt, NBD_INFO_NAME, namelen, name,
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rc = nbd_negotiate_send_info(client, NBD_INFO_NAME, namelen, name,
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errp);
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if (rc < 0) {
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return rc;
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@ -478,7 +483,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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if (exp->description) {
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size_t len = strlen(exp->description);
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rc = nbd_negotiate_send_info(client, opt, NBD_INFO_DESCRIPTION,
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rc = nbd_negotiate_send_info(client, NBD_INFO_DESCRIPTION,
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len, exp->description, errp);
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if (rc < 0) {
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return rc;
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@ -490,7 +495,8 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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* whether this is OPT_INFO or OPT_GO. */
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/* minimum - 1 for back-compat, or 512 if client is new enough.
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* TODO: consult blk_bs(blk)->bl.request_alignment? */
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sizes[0] = (opt == NBD_OPT_INFO || blocksize) ? BDRV_SECTOR_SIZE : 1;
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sizes[0] =
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(client->opt == NBD_OPT_INFO || blocksize) ? BDRV_SECTOR_SIZE : 1;
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/* preferred - Hard-code to 4096 for now.
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* TODO: is blk_bs(blk)->bl.opt_transfer appropriate? */
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sizes[1] = 4096;
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@ -500,7 +506,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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cpu_to_be32s(&sizes[0]);
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cpu_to_be32s(&sizes[1]);
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cpu_to_be32s(&sizes[2]);
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rc = nbd_negotiate_send_info(client, opt, NBD_INFO_BLOCK_SIZE,
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rc = nbd_negotiate_send_info(client, NBD_INFO_BLOCK_SIZE,
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sizeof(sizes), sizes, errp);
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if (rc < 0) {
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return rc;
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@ -511,7 +517,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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exp->nbdflags | myflags);
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stq_be_p(buf, exp->size);
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stw_be_p(buf + 8, exp->nbdflags | myflags);
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rc = nbd_negotiate_send_info(client, opt, NBD_INFO_EXPORT,
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rc = nbd_negotiate_send_info(client, NBD_INFO_EXPORT,
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sizeof(buf), buf, errp);
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if (rc < 0) {
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return rc;
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@ -521,21 +527,21 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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* request block sizes, return an error.
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* TODO: consult blk_bs(blk)->request_align, and only error if it
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* is not 1? */
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if (opt == NBD_OPT_INFO && !blocksize) {
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return nbd_negotiate_send_rep_err(client->ioc,
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NBD_REP_ERR_BLOCK_SIZE_REQD, opt,
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if (client->opt == NBD_OPT_INFO && !blocksize) {
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return nbd_negotiate_send_rep_err(client,
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NBD_REP_ERR_BLOCK_SIZE_REQD,
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errp,
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"request NBD_INFO_BLOCK_SIZE to "
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"use this export");
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}
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/* Final reply */
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rc = nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK, opt, errp);
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rc = nbd_negotiate_send_rep(client, NBD_REP_ACK, errp);
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if (rc < 0) {
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return rc;
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}
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if (opt == NBD_OPT_GO) {
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if (client->opt == NBD_OPT_GO) {
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client->exp = exp;
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QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
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nbd_export_get(client->exp);
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@ -544,10 +550,10 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint32_t length,
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return rc;
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invalid:
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if (nbd_drop(client->ioc, length, errp) < 0) {
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if (nbd_drop(client->ioc, client->optlen, errp) < 0) {
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return -EIO;
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}
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return nbd_negotiate_send_rep_err(client->ioc, NBD_REP_ERR_INVALID, opt,
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return nbd_negotiate_send_rep_err(client, NBD_REP_ERR_INVALID,
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errp, "%s", msg);
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}
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@ -561,11 +567,12 @@ static QIOChannel *nbd_negotiate_handle_starttls(NBDClient *client,
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QIOChannelTLS *tioc;
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struct NBDTLSHandshakeData data = { 0 };
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assert(client->opt == NBD_OPT_STARTTLS);
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trace_nbd_negotiate_handle_starttls();
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ioc = client->ioc;
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if (nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK,
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NBD_OPT_STARTTLS, errp) < 0) {
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if (nbd_negotiate_send_rep(client, NBD_REP_ACK, errp) < 0) {
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return NULL;
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}
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@ -670,12 +677,14 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
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return -EINVAL;
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}
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option = be32_to_cpu(option);
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client->opt = option;
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if (nbd_read(client->ioc, &length, sizeof(length), errp) < 0) {
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error_prepend(errp, "read failed: ");
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return -EINVAL;
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}
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length = be32_to_cpu(length);
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client->optlen = length;
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|
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if (length > NBD_MAX_BUFFER_SIZE) {
|
||||
error_setg(errp, "len (%" PRIu32" ) is larger than max len (%u)",
|
||||
|
|
@ -697,8 +706,7 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
if (length) {
|
||||
/* Unconditionally drop the connection if the client
|
||||
* can't start a TLS negotiation correctly */
|
||||
return nbd_reject_length(client, length, option, true,
|
||||
errp);
|
||||
return nbd_reject_length(client, true, errp);
|
||||
}
|
||||
tioc = nbd_negotiate_handle_starttls(client, errp);
|
||||
if (!tioc) {
|
||||
|
|
@ -719,9 +727,8 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
if (nbd_drop(client->ioc, length, errp) < 0) {
|
||||
return -EIO;
|
||||
}
|
||||
ret = nbd_negotiate_send_rep_err(client->ioc,
|
||||
NBD_REP_ERR_TLS_REQD,
|
||||
option, errp,
|
||||
ret = nbd_negotiate_send_rep_err(client,
|
||||
NBD_REP_ERR_TLS_REQD, errp,
|
||||
"Option 0x%" PRIx32
|
||||
"not permitted before TLS",
|
||||
option);
|
||||
|
|
@ -737,8 +744,7 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
switch (option) {
|
||||
case NBD_OPT_LIST:
|
||||
if (length) {
|
||||
ret = nbd_reject_length(client, length, option, false,
|
||||
errp);
|
||||
ret = nbd_reject_length(client, false, errp);
|
||||
} else {
|
||||
ret = nbd_negotiate_handle_list(client, errp);
|
||||
}
|
||||
|
|
@ -748,18 +754,17 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
/* NBD spec says we must try to reply before
|
||||
* disconnecting, but that we must also tolerate
|
||||
* guests that don't wait for our reply. */
|
||||
nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK, option, NULL);
|
||||
nbd_negotiate_send_rep(client, NBD_REP_ACK, NULL);
|
||||
return 1;
|
||||
|
||||
case NBD_OPT_EXPORT_NAME:
|
||||
return nbd_negotiate_handle_export_name(client, length,
|
||||
return nbd_negotiate_handle_export_name(client,
|
||||
myflags, no_zeroes,
|
||||
errp);
|
||||
|
||||
case NBD_OPT_INFO:
|
||||
case NBD_OPT_GO:
|
||||
ret = nbd_negotiate_handle_info(client, length, option,
|
||||
myflags, errp);
|
||||
ret = nbd_negotiate_handle_info(client, myflags, errp);
|
||||
if (ret == 1) {
|
||||
assert(option == NBD_OPT_GO);
|
||||
return 0;
|
||||
|
|
@ -768,32 +773,27 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
|
||||
case NBD_OPT_STARTTLS:
|
||||
if (length) {
|
||||
ret = nbd_reject_length(client, length, option, false,
|
||||
errp);
|
||||
ret = nbd_reject_length(client, false, errp);
|
||||
} else if (client->tlscreds) {
|
||||
ret = nbd_negotiate_send_rep_err(client->ioc,
|
||||
NBD_REP_ERR_INVALID,
|
||||
option, errp,
|
||||
ret = nbd_negotiate_send_rep_err(client,
|
||||
NBD_REP_ERR_INVALID, errp,
|
||||
"TLS already enabled");
|
||||
} else {
|
||||
ret = nbd_negotiate_send_rep_err(client->ioc,
|
||||
NBD_REP_ERR_POLICY,
|
||||
option, errp,
|
||||
ret = nbd_negotiate_send_rep_err(client,
|
||||
NBD_REP_ERR_POLICY, errp,
|
||||
"TLS not configured");
|
||||
}
|
||||
break;
|
||||
|
||||
case NBD_OPT_STRUCTURED_REPLY:
|
||||
if (length) {
|
||||
ret = nbd_reject_length(client, length, option, false,
|
||||
errp);
|
||||
ret = nbd_reject_length(client, false, errp);
|
||||
} else if (client->structured_reply) {
|
||||
ret = nbd_negotiate_send_rep_err(
|
||||
client->ioc, NBD_REP_ERR_INVALID, option, errp,
|
||||
client, NBD_REP_ERR_INVALID, errp,
|
||||
"structured reply already negotiated");
|
||||
} else {
|
||||
ret = nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK,
|
||||
option, errp);
|
||||
ret = nbd_negotiate_send_rep(client, NBD_REP_ACK, errp);
|
||||
client->structured_reply = true;
|
||||
myflags |= NBD_FLAG_SEND_DF;
|
||||
}
|
||||
|
|
@ -803,9 +803,8 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
if (nbd_drop(client->ioc, length, errp) < 0) {
|
||||
return -EIO;
|
||||
}
|
||||
ret = nbd_negotiate_send_rep_err(client->ioc,
|
||||
NBD_REP_ERR_UNSUP,
|
||||
option, errp,
|
||||
ret = nbd_negotiate_send_rep_err(client,
|
||||
NBD_REP_ERR_UNSUP, errp,
|
||||
"Unsupported option 0x%"
|
||||
PRIx32 " (%s)", option,
|
||||
nbd_opt_lookup(option));
|
||||
|
|
@ -818,7 +817,7 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
|
|||
*/
|
||||
switch (option) {
|
||||
case NBD_OPT_EXPORT_NAME:
|
||||
return nbd_negotiate_handle_export_name(client, length,
|
||||
return nbd_negotiate_handle_export_name(client,
|
||||
myflags, no_zeroes,
|
||||
errp);
|
||||
|
||||
|
|
@ -898,6 +897,7 @@ static coroutine_fn int nbd_negotiate(NBDClient *client, Error **errp)
|
|||
}
|
||||
}
|
||||
|
||||
assert(!client->optlen);
|
||||
trace_nbd_negotiate_success();
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
Loading…
Reference in New Issue