/* * This file and its contents are supplied under the terms of the * Common Development and Distribution License ("CDDL"), version 1.0. * You may only use this file in accordance with the terms of version * 1.0 of the CDDL. * * A full copy of the text of the CDDL should have accompanied this * source. A copy of the CDDL is also available via the Internet at * http://www.illumos.org/license/CDDL. */ /* * Copyright 2015 Nexenta Systems, Inc. All rights reserved. */ #include #include #include /* * Saved state for a command that "goes async". When a compound request * contains a command that may block indefinitely, the compound reply is * composed with an "interim response" for that command, and information * needed to actually dispatch that command is saved on a list of "async" * commands for this compound request. After the compound reply is sent, * the list of async commands is processed, and those may block as long * as they need to without affecting the initial compound request. * * Now interestingly, this "async" mechanism is not used with the full * range of asynchrony that one might imagine. The design of async * request processing can be drastically simplified if we can assume * that there's no need to run more than one async command at a time. * With that simplifying assumption, we can continue using the current * "one worker thread per request message" model, which has very simple * locking rules etc. The same worker thread that handles the initial * compound request can handle the list of async requests. * * As it turns out, SMB2 clients do not try to use more than one "async" * command in a compound. If they were to do so, the [MS-SMB2] spec. * allows us to decline additional async requests with an error. * * smb_async_req_t is the struct used to save an "async" request on * the list of requests that had an interim reply in the initial * compound reply. This includes everything needed to restart * processing at the async command. */ typedef struct smb2_async_req { smb_sdrc_t (*ar_func)(smb_request_t *); int ar_cmd_hdr; /* smb2_cmd_hdr offset */ int ar_cmd_len; /* length from hdr */ /* * SMB2 header fields. */ uint16_t ar_cmd_code; uint16_t ar_uid; uint16_t ar_tid; uint32_t ar_pid; uint32_t ar_hdr_flags; uint64_t ar_messageid; } smb2_async_req_t; void smb2sr_do_async(smb_request_t *); smb_sdrc_t smb2_invalid_cmd(smb_request_t *); static void smb2_tq_work(void *); static const smb_disp_entry_t const smb2_disp_table[SMB2__NCMDS] = { /* text-name, pre, func, post, cmd-code, dialect, flags */ { "smb2_negotiate", NULL, smb2_negotiate, NULL, 0, 0, SDDF_SUPPRESS_TID | SDDF_SUPPRESS_UID }, { "smb2_session_setup", NULL, smb2_session_setup, NULL, 0, 0, SDDF_SUPPRESS_TID | SDDF_SUPPRESS_UID }, { "smb2_logoff", NULL, smb2_logoff, NULL, 0, 0, SDDF_SUPPRESS_TID }, { "smb2_tree_connect", NULL, smb2_tree_connect, NULL, 0, 0, SDDF_SUPPRESS_TID }, { "smb2_tree_disconn", NULL, smb2_tree_disconn, NULL, 0, 0 }, { "smb2_create", NULL, smb2_create, NULL, 0, 0 }, { "smb2_close", NULL, smb2_close, NULL, 0, 0 }, { "smb2_flush", NULL, smb2_flush, NULL, 0, 0 }, { "smb2_read", NULL, smb2_read, NULL, 0, 0 }, { "smb2_write", NULL, smb2_write, NULL, 0, 0 }, { "smb2_lock", NULL, smb2_lock, NULL, 0, 0 }, { "smb2_ioctl", NULL, smb2_ioctl, NULL, 0, 0 }, /* * Note: Cancel gets the "invalid command" handler because * that's always handled directly in the reader. We should * never get to the function using this table, but note: * We CAN get here if a nasty client adds cancel to some * compound message, which is a protocol violation. */ { "smb2_cancel", NULL, smb2_invalid_cmd, NULL, 0, 0 }, { "smb2_echo", NULL, smb2_echo, NULL, 0, 0, SDDF_SUPPRESS_UID | SDDF_SUPPRESS_TID }, { "smb2_query_dir", NULL, smb2_query_dir, NULL, 0, 0 }, { "smb2_change_notify", NULL, smb2_change_notify, NULL, 0, 0 }, { "smb2_query_info", NULL, smb2_query_info, NULL, 0, 0 }, { "smb2_set_info", NULL, smb2_set_info, NULL, 0, 0 }, { "smb2_oplock_break_ack", NULL, smb2_oplock_break_ack, NULL, 0, 0 }, { "smb2_invalid_cmd", NULL, smb2_invalid_cmd, NULL, 0, 0, SDDF_SUPPRESS_UID | SDDF_SUPPRESS_TID }, }; smb_sdrc_t smb2_invalid_cmd(smb_request_t *sr) { #ifdef DEBUG cmn_err(CE_NOTE, "clnt %s bad SMB2 cmd code", sr->session->ip_addr_str); #endif sr->smb2_status = NT_STATUS_INVALID_PARAMETER; return (SDRC_DROP_VC); } /* * This is the SMB2 handler for new smb requests, called from * smb_session_reader after SMB negotiate is done. For most SMB2 * requests, we just enqueue them for the smb_session_worker to * execute via the task queue, so they can block for resources * without stopping the reader thread. A few protocol messages * are special cases and are handled directly here in the reader * thread so they don't wait for taskq scheduling. * * This function must either enqueue the new request for * execution via the task queue, or execute it directly * and then free it. If this returns non-zero, the caller * will drop the session. */ int smb2sr_newrq(smb_request_t *sr) { uint32_t magic; uint16_t command; int rc; magic = LE_IN32(sr->sr_request_buf); if (magic != SMB2_PROTOCOL_MAGIC) { smb_request_free(sr); /* will drop the connection */ return (EPROTO); } /* * Execute Cancel requests immediately, (here in the * reader thread) so they won't wait for any other * commands we might already have in the task queue. * Cancel also skips signature verification and * does not consume a sequence number. * [MS-SMB2] 3.2.4.24 Cancellation... */ command = LE_IN16((uint8_t *)sr->sr_request_buf + 12); if (command == SMB2_CANCEL) { rc = smb2sr_newrq_cancel(sr); smb_request_free(sr); return (rc); } /* * Submit the request to the task queue, which calls * smb2_tq_work when the workload permits. */ sr->sr_time_submitted = gethrtime(); sr->sr_state = SMB_REQ_STATE_SUBMITTED; smb_srqueue_waitq_enter(sr->session->s_srqueue); (void) taskq_dispatch(sr->sr_server->sv_worker_pool, smb2_tq_work, sr, TQ_SLEEP); return (0); } static void smb2_tq_work(void *arg) { smb_request_t *sr; smb_srqueue_t *srq; sr = (smb_request_t *)arg; SMB_REQ_VALID(sr); srq = sr->session->s_srqueue; smb_srqueue_waitq_to_runq(srq); sr->sr_worker = curthread; sr->sr_time_active = gethrtime(); /* * In contrast with SMB1, SMB2 must _always_ dispatch to * the handler function, because cancelled requests need * an error reply (NT_STATUS_CANCELLED). */ smb2sr_work(sr); smb_srqueue_runq_exit(srq); } /* * smb2sr_work * * This function processes each SMB command in the current request * (which may be a compound request) building a reply containing * SMB reply messages, one-to-one with the SMB commands. Some SMB * commands (change notify, blocking locks) may require both an * "interim response" and a later "async response" at completion. * In such cases, we'll encode the interim response in the reply * compound we're building, and put the (now async) command on a * list of commands that need further processing. After we've * finished processing the commands in this compound and building * the compound reply, we'll send the compound reply, and finally * process the list of async commands. * * As we work our way through the compound request and reply, * we need to keep track of the bounds of the current request * and reply. For the request, this uses an MBC_SHADOW_CHAIN * that begins at smb2_cmd_hdr. The reply is appended to the * sr->reply chain starting at smb2_reply_hdr. * * This function must always free the smb request. */ void smb2sr_work(struct smb_request *sr) { const smb_disp_entry_t *sdd; smb_disp_stats_t *sds; smb_session_t *session; uint32_t msg_len; uint16_t cmd_idx; int rc = 0; boolean_t disconnect = B_FALSE; boolean_t related; session = sr->session; ASSERT(sr->tid_tree == 0); ASSERT(sr->uid_user == 0); ASSERT(sr->fid_ofile == 0); sr->smb_fid = (uint16_t)-1; sr->smb2_status = 0; /* temporary until we identify a user */ sr->user_cr = zone_kcred(); mutex_enter(&sr->sr_mutex); switch (sr->sr_state) { case SMB_REQ_STATE_SUBMITTED: case SMB_REQ_STATE_CLEANED_UP: sr->sr_state = SMB_REQ_STATE_ACTIVE; break; default: ASSERT(0); /* FALLTHROUGH */ case SMB_REQ_STATE_CANCELED: sr->smb2_status = NT_STATUS_CANCELLED; break; } mutex_exit(&sr->sr_mutex); cmd_start: /* * Decode the request header * * Most problems with decoding will result in the error * STATUS_INVALID_PARAMETER. If the decoding problem * prevents continuing, we'll close the connection. * [MS-SMB2] 3.3.5.2.6 Handling Incorrectly Formatted... * * We treat some status codes as if "sticky", meaning * once they're set after some command handler returns, * all remaining commands get this status without even * calling the command-specific handler. The cancelled * status is used above, and insufficient_resources is * used when smb2sr_go_async declines to "go async". * Otherwise initialize to zero (success). */ if (sr->smb2_status != NT_STATUS_CANCELLED && sr->smb2_status != NT_STATUS_INSUFFICIENT_RESOURCES) sr->smb2_status = 0; sr->smb2_cmd_hdr = sr->command.chain_offset; if ((rc = smb2_decode_header(sr)) != 0) { cmn_err(CE_WARN, "clnt %s bad SMB2 header", session->ip_addr_str); disconnect = B_TRUE; goto cleanup; } /* * The SMB2_FLAGS_SERVER_TO_REDIR should only appear * in messages from the server back to the client. */ if ((sr->smb2_hdr_flags & SMB2_FLAGS_SERVER_TO_REDIR) != 0) { cmn_err(CE_WARN, "clnt %s bad SMB2 flags", session->ip_addr_str); disconnect = B_TRUE; goto cleanup; } related = (sr->smb2_hdr_flags & SMB2_FLAGS_RELATED_OPERATIONS); /* * In case we bail out with an error before we get to the * section that computes the credit grant, initialize the * response header fields so that credits won't change. * Note: SMB 2.02 clients may send credit charge zero. */ if (sr->smb2_credit_charge == 0) sr->smb2_credit_charge = 1; sr->smb2_credit_response = sr->smb2_credit_charge; /* * Reserve space for the reply header, and save the offset. * The reply header will be overwritten later. If we have * already exhausted the output space, then this client is * trying something funny. Log it and kill 'em. */ sr->smb2_reply_hdr = sr->reply.chain_offset; if ((rc = smb2_encode_header(sr, B_FALSE)) != 0) { cmn_err(CE_WARN, "clnt %s excessive reply", session->ip_addr_str); disconnect = B_TRUE; goto cleanup; } /* * Figure out the length of data following the SMB2 header. * It ends at either the next SMB2 header if there is one * (smb2_next_command != 0) or at the end of the message. */ if (sr->smb2_next_command != 0) { /* [MS-SMB2] says this is 8-byte aligned */ msg_len = sr->smb2_next_command; if ((msg_len & 7) != 0 || (msg_len < SMB2_HDR_SIZE) || ((sr->smb2_cmd_hdr + msg_len) > sr->command.max_bytes)) { cmn_err(CE_WARN, "clnt %s bad SMB2 next cmd", session->ip_addr_str); disconnect = B_TRUE; goto cleanup; } } else { msg_len = sr->command.max_bytes - sr->smb2_cmd_hdr; } /* * Setup a shadow chain for this SMB2 command, starting * with the header and ending at either the next command * or the end of the message. The signing check below * needs the entire SMB2 command. After that's done, we * advance chain_offset to the end of the header where * the command specific handlers continue decoding. */ (void) MBC_SHADOW_CHAIN(&sr->smb_data, &sr->command, sr->smb2_cmd_hdr, msg_len); /* * Validate the commmand code, get dispatch table entries. * [MS-SMB2] 3.3.5.2.6 Handling Incorrectly Formatted... * * The last slot in the dispatch table is used to handle * invalid commands. Same for statistics. */ if (sr->smb2_cmd_code < SMB2_INVALID_CMD) cmd_idx = sr->smb2_cmd_code; else cmd_idx = SMB2_INVALID_CMD; sdd = &smb2_disp_table[cmd_idx]; sds = &session->s_server->sv_disp_stats2[cmd_idx]; /* * If this command is NOT "related" to the previous, * clear out the UID, TID, FID state that might be * left over from the previous command. * * If the command IS related, any new IDs are ignored, * and we simply continue with the previous user, tree, * and open file. */ if (!related) { /* * Drop user, tree, file; carefully ordered to * avoid dangling references: file, tree, user */ if (sr->fid_ofile != NULL) { smb_ofile_request_complete(sr->fid_ofile); smb_ofile_release(sr->fid_ofile); sr->fid_ofile = NULL; } if (sr->tid_tree != NULL) { smb_tree_release(sr->tid_tree); sr->tid_tree = NULL; } if (sr->uid_user != NULL) { smb_user_release(sr->uid_user); sr->uid_user = NULL; sr->user_cr = zone_kcred(); } } /* * Make sure we have a user and tree as needed * according to the flags for the this command. * Note that we may have inherited these. */ if ((sdd->sdt_flags & SDDF_SUPPRESS_UID) == 0) { /* * This command requires a user session. */ if (related) { /* * Previous command should have given us a user. * [MS-SMB2] 3.3.5.2 Handling Related Requests */ if (sr->uid_user == NULL) { smb2sr_put_error(sr, NT_STATUS_INVALID_PARAMETER); goto cmd_done; } sr->smb_uid = sr->uid_user->u_uid; } else { /* * Lookup the UID * [MS-SMB2] 3.3.5.2 Verifying the Session */ ASSERT(sr->uid_user == NULL); sr->uid_user = smb_session_lookup_uid(session, sr->smb_uid); if (sr->uid_user == NULL) { smb2sr_put_error(sr, NT_STATUS_USER_SESSION_DELETED); goto cmd_done; } sr->user_cr = smb_user_getcred(sr->uid_user); } ASSERT(sr->uid_user != NULL); } if ((sdd->sdt_flags & SDDF_SUPPRESS_TID) == 0) { /* * This command requires a tree connection. */ if (related) { /* * Previous command should have given us a tree. * [MS-SMB2] 3.3.5.2 Handling Related Requests */ if (sr->tid_tree == NULL) { smb2sr_put_error(sr, NT_STATUS_INVALID_PARAMETER); goto cmd_done; } sr->smb_tid = sr->tid_tree->t_tid; } else { /* * Lookup the TID * [MS-SMB2] 3.3.5.2 Verifying the Tree Connect */ ASSERT(sr->tid_tree == NULL); sr->tid_tree = smb_session_lookup_tree(session, sr->smb_tid); if (sr->tid_tree == NULL) { smb2sr_put_error(sr, NT_STATUS_NETWORK_NAME_DELETED); goto cmd_done; } } ASSERT(sr->tid_tree != NULL); } /* * SMB2 signature verification, two parts: * (a) Require SMB2_FLAGS_SIGNED (for most request types) * (b) If SMB2_FLAGS_SIGNED is set, check the signature. * [MS-SMB2] 3.3.5.2.4 Verifying the Signature */ /* * No user session means no signature check. That's OK, * i.e. for commands marked SDDF_SUPPRESS_UID above. * Note, this also means we won't sign the reply. */ if (sr->uid_user == NULL) sr->smb2_hdr_flags &= ~SMB2_FLAGS_SIGNED; /* * The SDDF_SUPPRESS_UID dispatch is set for requests that * don't need a UID (user). These also don't require a * signature check here. */ if ((sdd->sdt_flags & SDDF_SUPPRESS_UID) == 0 && sr->uid_user != NULL && (sr->uid_user->u_sign_flags & SMB_SIGNING_CHECK) != 0) { /* * This request type should be signed, and * we're configured to require signatures. */ if ((sr->smb2_hdr_flags & SMB2_FLAGS_SIGNED) == 0) { smb2sr_put_error(sr, NT_STATUS_ACCESS_DENIED); goto cmd_done; } rc = smb2_sign_check_request(sr); if (rc != 0) { DTRACE_PROBE1(smb2__sign__check, smb_request_t, sr); smb2sr_put_error(sr, NT_STATUS_ACCESS_DENIED); goto cmd_done; } } /* * Now that the signing check is done with smb_data, * advance past the SMB2 header we decoded earlier. * This leaves sr->smb_data correctly positioned * for command-specific decoding in the dispatch * function called next. */ sr->smb_data.chain_offset = sr->smb2_cmd_hdr + SMB2_HDR_SIZE; /* * SMB2 credits determine how many simultaneous commands the * client may issue, and bounds the range of message IDs those * commands may use. With multi-credit support, commands may * use ranges of message IDs, where the credits used by each * command are proportional to their data transfer size. * * Every command may request an increase or decrease of * the currently granted credits, based on the difference * between the credit request and the credit charge. * [MS-SMB2] 3.3.1.2 Algorithm for the Granting of Credits * * Most commands have credit_request=1, credit_charge=1, * which keeps the credit grant unchanged. * * All we're really doing here (for now) is reducing the * credit_response if the client requests a credit increase * that would take their credit over the maximum, and * limiting the decrease so they don't run out of credits. * * Later, this could do something dynamic based on load. * * One other non-obvious bit about credits: We keep the * session s_max_credits low until the 1st authentication, * at which point we'll set the normal maximum_credits. * Some clients ask for more credits with session setup, * and we need to handle that requested increase _after_ * the command-specific handler returns so it won't be * restricted to the lower (pre-auth) limit. */ sr->smb2_credit_response = sr->smb2_credit_request; if (sr->smb2_credit_request < sr->smb2_credit_charge) { uint16_t cur, d; mutex_enter(&session->s_credits_mutex); cur = session->s_cur_credits; /* Handle credit decrease. */ d = sr->smb2_credit_charge - sr->smb2_credit_request; cur -= d; if (cur & 0x8000) { /* * underflow (bad credit charge or request) * leave credits unchanged (response=charge) */ cur = session->s_cur_credits; sr->smb2_credit_response = sr->smb2_credit_charge; DTRACE_PROBE1(smb2__credit__neg, smb_request_t, sr); } /* * The server MUST ensure that the number of credits * held by the client is never reduced to zero. * [MS-SMB2] 3.3.1.2 */ if (cur == 0) { cur = 1; sr->smb2_credit_response += 1; DTRACE_PROBE1(smb2__credit__min, smb_request_t, sr); } DTRACE_PROBE3(smb2__credit__decrease, smb_request_t, sr, int, (int)cur, int, (int)session->s_cur_credits); session->s_cur_credits = cur; mutex_exit(&session->s_credits_mutex); } /* * The real work: call the SMB2 command handler * (except for "sticky" smb2_status - see above) */ sr->sr_time_start = gethrtime(); rc = SDRC_SUCCESS; if (sr->smb2_status == 0) { /* NB: not using pre_op */ rc = (*sdd->sdt_function)(sr); /* NB: not using post_op */ } MBC_FLUSH(&sr->raw_data); /* * Second half of SMB2 credit handling (increases) */ if (sr->smb2_credit_request > sr->smb2_credit_charge) { uint16_t cur, d; mutex_enter(&session->s_credits_mutex); cur = session->s_cur_credits; /* Handle credit increase. */ d = sr->smb2_credit_request - sr->smb2_credit_charge; cur += d; /* * If new credits would be above max, * reduce the credit grant. */ if (cur > session->s_max_credits) { d = cur - session->s_max_credits; cur = session->s_max_credits; sr->smb2_credit_response -= d; DTRACE_PROBE1(smb2__credit__max, smb_request_t, sr); } DTRACE_PROBE3(smb2__credit__increase, smb_request_t, sr, int, (int)cur, int, (int)session->s_cur_credits); session->s_cur_credits = cur; mutex_exit(&session->s_credits_mutex); } cmd_done: /* * Pad the reply to align(8) if necessary. */ if (sr->reply.chain_offset & 7) { int padsz = 8 - (sr->reply.chain_offset & 7); (void) smb_mbc_encodef(&sr->reply, "#.", padsz); } ASSERT((sr->reply.chain_offset & 7) == 0); /* * Record some statistics: latency, rx bytes, tx bytes. */ smb_latency_add_sample(&sds->sdt_lat, gethrtime() - sr->sr_time_start); atomic_add_64(&sds->sdt_rxb, (int64_t)(sr->command.chain_offset - sr->smb2_cmd_hdr)); atomic_add_64(&sds->sdt_txb, (int64_t)(sr->reply.chain_offset - sr->smb2_reply_hdr)); switch (rc) { case SDRC_SUCCESS: break; default: /* * SMB2 does not use the other dispatch return codes. * If we see something else, log an event so we'll * know something is returning bogus status codes. * If you see these in the log, use dtrace to find * the code returning something else. */ #ifdef DEBUG cmn_err(CE_NOTE, "handler for %u returned 0x%x", sr->smb2_cmd_code, rc); #endif /* FALLTHROUGH */ case SDRC_ERROR: if (sr->smb2_status == 0) sr->smb2_status = NT_STATUS_INTERNAL_ERROR; break; case SDRC_DROP_VC: disconnect = B_TRUE; goto cleanup; } /* * If there's a next command, figure out where it starts, * and fill in the next command offset for the reply. * Note: We sanity checked smb2_next_command above * (the offset to the next command). Similarly set * smb2_next_reply as the offset to the next reply. */ if (sr->smb2_next_command != 0) { sr->command.chain_offset = sr->smb2_cmd_hdr + sr->smb2_next_command; sr->smb2_next_reply = sr->reply.chain_offset - sr->smb2_reply_hdr; } else { sr->smb2_next_reply = 0; } /* * Overwrite the SMB2 header for the response of * this command (possibly part of a compound). * encode_header adds: SMB2_FLAGS_SERVER_TO_REDIR */ (void) smb2_encode_header(sr, B_TRUE); if (sr->smb2_hdr_flags & SMB2_FLAGS_SIGNED) smb2_sign_reply(sr); if (sr->smb2_next_command != 0) goto cmd_start; /* * We've done all the commands in this compound. * Send it out. */ smb2_send_reply(sr); /* * If any of the requests "went async", process those now. * The async. function "keeps" this sr, changing its state * to completed and calling smb_request_free(). */ if (sr->sr_async_req != NULL) { smb2sr_do_async(sr); return; } cleanup: if (disconnect) { smb_rwx_rwenter(&session->s_lock, RW_WRITER); switch (session->s_state) { case SMB_SESSION_STATE_DISCONNECTED: case SMB_SESSION_STATE_TERMINATED: break; default: smb_soshutdown(session->sock); session->s_state = SMB_SESSION_STATE_DISCONNECTED; break; } smb_rwx_rwexit(&session->s_lock); } mutex_enter(&sr->sr_mutex); sr->sr_state = SMB_REQ_STATE_COMPLETED; mutex_exit(&sr->sr_mutex); smb_request_free(sr); } /* * Dispatch an async request using saved information. * See smb2sr_save_async and [MS-SMB2] 3.3.4.2 * * This is sort of a "lite" version of smb2sr_work. Initialize the * command and reply areas as they were when the command-speicific * handler started (in case it needs to decode anything again). * Call the async function, which builds the command-specific part * of the response. Finally, send the response and free the sr. */ void smb2sr_do_async(smb_request_t *sr) { const smb_disp_entry_t *sdd; smb_disp_stats_t *sds; smb2_async_req_t *ar; int rc = 0; /* * Restore what smb2_decode_header found. * (In lieu of decoding it again.) */ ar = sr->sr_async_req; sr->smb2_cmd_hdr = ar->ar_cmd_hdr; sr->smb2_cmd_code = ar->ar_cmd_code; sr->smb2_hdr_flags = ar->ar_hdr_flags; sr->smb2_async_id = (uintptr_t)ar; sr->smb2_messageid = ar->ar_messageid; sr->smb_pid = ar->ar_pid; sr->smb_tid = ar->ar_tid; sr->smb_uid = ar->ar_uid; sr->smb2_status = 0; /* * Async requests don't grant credits, because any credits * should have gone out with the interim reply. * An async reply goes alone (no next reply). */ sr->smb2_credit_response = 0; sr->smb2_next_reply = 0; /* * Setup input mbuf_chain */ ASSERT(ar->ar_cmd_len >= SMB2_HDR_SIZE); (void) MBC_SHADOW_CHAIN(&sr->smb_data, &sr->command, sr->smb2_cmd_hdr + SMB2_HDR_SIZE, ar->ar_cmd_len - SMB2_HDR_SIZE); /* * Setup output mbuf_chain */ MBC_FLUSH(&sr->reply); sr->smb2_reply_hdr = sr->reply.chain_offset; (void) smb2_encode_header(sr, B_FALSE); VERIFY3U(sr->smb2_cmd_code, <, SMB2_INVALID_CMD); sdd = &smb2_disp_table[sr->smb2_cmd_code]; sds = sr->session->s_server->sv_disp_stats2; sds = &sds[sr->smb2_cmd_code]; /* * Keep the UID, TID, ofile we have. */ if ((sdd->sdt_flags & SDDF_SUPPRESS_UID) == 0 && sr->uid_user == NULL) { smb2sr_put_error(sr, NT_STATUS_USER_SESSION_DELETED); goto cmd_done; } if ((sdd->sdt_flags & SDDF_SUPPRESS_TID) == 0 && sr->tid_tree == NULL) { smb2sr_put_error(sr, NT_STATUS_NETWORK_NAME_DELETED); goto cmd_done; } /* * Signature already verified * Credits handled... * * Just call the async handler function. */ rc = ar->ar_func(sr); if (rc != 0 && sr->smb2_status == 0) sr->smb2_status = NT_STATUS_INTERNAL_ERROR; cmd_done: /* * Pad the reply to align(8) if necessary. */ if (sr->reply.chain_offset & 7) { int padsz = 8 - (sr->reply.chain_offset & 7); (void) smb_mbc_encodef(&sr->reply, "#.", padsz); } ASSERT((sr->reply.chain_offset & 7) == 0); /* * Record some statistics: (just tx bytes here) */ atomic_add_64(&sds->sdt_txb, (int64_t)(sr->reply.chain_offset - sr->smb2_reply_hdr)); /* * Overwrite the SMB2 header for the response of * this command (possibly part of a compound). * The call adds: SMB2_FLAGS_SERVER_TO_REDIR */ (void) smb2_encode_header(sr, B_TRUE); if (sr->smb2_hdr_flags & SMB2_FLAGS_SIGNED) smb2_sign_reply(sr); smb2_send_reply(sr); /* * Done. Unlink and free. */ sr->sr_async_req = NULL; kmem_free(ar, sizeof (*ar)); mutex_enter(&sr->sr_mutex); sr->sr_state = SMB_REQ_STATE_COMPLETED; mutex_exit(&sr->sr_mutex); smb_request_free(sr); } /* * In preparation for sending an "interim response", save * all the state we'll need to run an async command later, * and assign an "async id" for this (now async) command. * See [MS-SMB2] 3.3.4.2 * * If more than one request in a compound request tries to * "go async", we can "say no". See [MS-SMB2] 3.3.4.2 * If an operation would require asynchronous processing * but resources are constrained, the server MAY choose to * fail that operation with STATUS_INSUFFICIENT_RESOURCES. * * For simplicity, we further restrict the cases where we're * willing to "go async", and only allow the last command in a * compound to "go async". It happens that this is the only * case where we're actually asked to go async anyway. This * simplification also means there can be at most one command * in a compound that "goes async" (the last one). * * If we agree to "go async", this should return STATUS_PENDING. * Otherwise return STATUS_INSUFFICIENT_RESOURCES for this and * all requests following this request. (See the comments re. * "sticky" smb2_status values in smb2sr_work). * * Note: the Async ID we assign here is arbitrary, and need only * be unique among pending async responses on this connection, so * this just uses an object address as the Async ID. * * Also, the assigned worker is the ONLY thread using this * async request object (sr_async_req) so no locking. */ uint32_t smb2sr_go_async(smb_request_t *sr, smb_sdrc_t (*async_func)(smb_request_t *)) { smb2_async_req_t *ar; if (sr->smb2_next_command != 0) return (NT_STATUS_INSUFFICIENT_RESOURCES); ASSERT(sr->sr_async_req == NULL); ar = kmem_zalloc(sizeof (*ar), KM_SLEEP); /* * Place an interim response in the compound reply. * * Turn on the "async" flag for both the (synchronous) * interim response and the (later) async response, * by storing that in flags before coping into ar. * * The "related" flag should always be off for the * async part because we're no longer operating on a * sequence of commands when we execute that. */ sr->smb2_hdr_flags |= SMB2_FLAGS_ASYNC_COMMAND; sr->smb2_async_id = (uintptr_t)ar; ar->ar_func = async_func; ar->ar_cmd_hdr = sr->smb2_cmd_hdr; ar->ar_cmd_len = sr->smb_data.max_bytes - sr->smb2_cmd_hdr; ar->ar_cmd_code = sr->smb2_cmd_code; ar->ar_hdr_flags = sr->smb2_hdr_flags & ~SMB2_FLAGS_RELATED_OPERATIONS; ar->ar_messageid = sr->smb2_messageid; ar->ar_pid = sr->smb_pid; ar->ar_tid = sr->smb_tid; ar->ar_uid = sr->smb_uid; sr->sr_async_req = ar; /* Interim responses are NOT signed. */ sr->smb2_hdr_flags &= ~SMB2_FLAGS_SIGNED; return (NT_STATUS_PENDING); } int smb2_decode_header(smb_request_t *sr) { uint64_t ssnid; uint32_t pid, tid; uint16_t hdr_len; int rc; rc = smb_mbc_decodef( &sr->command, "Nwww..wwllqllq16c", &hdr_len, /* w */ &sr->smb2_credit_charge, /* w */ &sr->smb2_chan_seq, /* w */ /* reserved .. */ &sr->smb2_cmd_code, /* w */ &sr->smb2_credit_request, /* w */ &sr->smb2_hdr_flags, /* l */ &sr->smb2_next_command, /* l */ &sr->smb2_messageid, /* q */ &pid, /* l */ &tid, /* l */ &ssnid, /* q */ sr->smb2_sig); /* 16c */ if (rc) return (rc); if (hdr_len != SMB2_HDR_SIZE) return (-1); sr->smb_uid = (uint16_t)ssnid; /* XXX wide UIDs */ if (sr->smb2_hdr_flags & SMB2_FLAGS_ASYNC_COMMAND) { sr->smb2_async_id = pid | ((uint64_t)tid) << 32; } else { sr->smb_pid = pid; sr->smb_tid = (uint16_t)tid; /* XXX wide TIDs */ } return (rc); } int smb2_encode_header(smb_request_t *sr, boolean_t overwrite) { uint64_t ssnid = sr->smb_uid; uint64_t pid_tid_aid; /* pid+tid, or async id */ uint32_t reply_hdr_flags; int rc; if (sr->smb2_hdr_flags & SMB2_FLAGS_ASYNC_COMMAND) { pid_tid_aid = sr->smb2_async_id; } else { pid_tid_aid = sr->smb_pid | ((uint64_t)sr->smb_tid) << 32; } reply_hdr_flags = sr->smb2_hdr_flags | SMB2_FLAGS_SERVER_TO_REDIR; if (overwrite) { rc = smb_mbc_poke(&sr->reply, sr->smb2_reply_hdr, "Nwwlwwllqqq16c", SMB2_HDR_SIZE, /* w */ sr->smb2_credit_charge, /* w */ sr->smb2_status, /* l */ sr->smb2_cmd_code, /* w */ sr->smb2_credit_response, /* w */ reply_hdr_flags, /* l */ sr->smb2_next_reply, /* l */ sr->smb2_messageid, /* q */ pid_tid_aid, /* q */ ssnid, /* q */ sr->smb2_sig); /* 16c */ } else { rc = smb_mbc_encodef(&sr->reply, "Nwwlwwllqqq16c", SMB2_HDR_SIZE, /* w */ sr->smb2_credit_charge, /* w */ sr->smb2_status, /* l */ sr->smb2_cmd_code, /* w */ sr->smb2_credit_response, /* w */ reply_hdr_flags, /* l */ sr->smb2_next_reply, /* l */ sr->smb2_messageid, /* q */ pid_tid_aid, /* q */ ssnid, /* q */ sr->smb2_sig); /* 16c */ } return (rc); } void smb2_send_reply(smb_request_t *sr) { if (smb_session_send(sr->session, 0, &sr->reply) == 0) sr->reply.chain = 0; } /* * This wrapper function exists to help catch calls to smbsr_status() * (which is SMB1-specific) in common code. See smbsr_status(). * If the log message below is seen, put a dtrace probe on this * function with a stack() action to see who is calling the SMB1 * "put error" from common code, and fix it. */ void smbsr_status_smb2(smb_request_t *sr, DWORD status) { const char *name; if (sr->smb2_cmd_code < SMB2__NCMDS) name = smb2_disp_table[sr->smb2_cmd_code].sdt_name; else name = ""; #ifdef DEBUG cmn_err(CE_NOTE, "smbsr_status called for %s", name); #endif smb2sr_put_error_data(sr, status, NULL); } void smb2sr_put_errno(struct smb_request *sr, int errnum) { uint32_t status = smb_errno2status(errnum); smb2sr_put_error_data(sr, status, NULL); } void smb2sr_put_error(smb_request_t *sr, uint32_t status) { smb2sr_put_error_data(sr, status, NULL); } /* * Build an SMB2 error response. [MS-SMB2] 2.2.2 */ void smb2sr_put_error_data(smb_request_t *sr, uint32_t status, mbuf_chain_t *mbc) { DWORD len; /* * The common dispatch code writes this when it * updates the SMB2 header before sending. */ sr->smb2_status = status; /* Rewind to the end of the SMB header. */ sr->reply.chain_offset = sr->smb2_reply_hdr + SMB2_HDR_SIZE; /* * NB: Must provide at least one byte of error data, * per [MS-SMB2] 2.2.2 */ if (mbc != NULL && (len = MBC_LENGTH(mbc)) != 0) { (void) smb_mbc_encodef( &sr->reply, "wwlC", 9, /* StructSize */ /* w */ 0, /* reserved */ /* w */ len, /* l */ mbc); /* C */ } else { (void) smb_mbc_encodef( &sr->reply, "wwl.", 9, /* StructSize */ /* w */ 0, /* reserved */ /* w */ 0); /* l. */ } } /* * smb2sr_lookup_fid * * Setup sr->fid_ofile, either inherited from a related command, * or obtained via FID lookup. Similar inheritance logic as in * smb2sr_work. */ uint32_t smb2sr_lookup_fid(smb_request_t *sr, smb2fid_t *fid) { boolean_t related = sr->smb2_hdr_flags & SMB2_FLAGS_RELATED_OPERATIONS; if (related) { if (sr->fid_ofile == NULL) return (NT_STATUS_INVALID_PARAMETER); sr->smb_fid = sr->fid_ofile->f_fid; return (0); } /* * If we could be sure this is called only once per cmd, * we could simply ASSERT(sr->fid_ofile == NULL) here. * However, there are cases where it can be called again * handling the same command, so let's tolerate that. */ if (sr->fid_ofile == NULL) { sr->smb_fid = (uint16_t)fid->temporal; sr->fid_ofile = smb_ofile_lookup_by_fid(sr, sr->smb_fid); } if (sr->fid_ofile == NULL) return (NT_STATUS_FILE_CLOSED); return (0); } /* * smb2_dispatch_stats_init * * Initializes dispatch statistics for SMB2. * See also smb_dispatch_stats_init(), which fills in * the lower part of the statistics array, from zero * through SMB_COM_NUM; */ void smb2_dispatch_stats_init(smb_server_t *sv) { smb_disp_stats_t *sds = sv->sv_disp_stats2; smb_kstat_req_t *ksr; int i; ksr = ((smbsrv_kstats_t *)sv->sv_ksp->ks_data)->ks_reqs2; for (i = 0; i < SMB2__NCMDS; i++, ksr++) { smb_latency_init(&sds[i].sdt_lat); (void) strlcpy(ksr->kr_name, smb2_disp_table[i].sdt_name, sizeof (ksr->kr_name)); } } /* * smb2_dispatch_stats_fini * * Frees and destroyes the resources used for statistics. */ void smb2_dispatch_stats_fini(smb_server_t *sv) { smb_disp_stats_t *sds = sv->sv_disp_stats2; int i; for (i = 0; i < SMB2__NCMDS; i++) smb_latency_destroy(&sds[i].sdt_lat); } void smb2_dispatch_stats_update(smb_server_t *sv, smb_kstat_req_t *ksr, int first, int nreq) { smb_disp_stats_t *sds = sv->sv_disp_stats2; int i; int last; last = first + nreq - 1; if ((first < SMB2__NCMDS) && (last < SMB2__NCMDS)) { for (i = first; i <= last; i++, ksr++) { ksr->kr_rxb = sds[i].sdt_rxb; ksr->kr_txb = sds[i].sdt_txb; mutex_enter(&sds[i].sdt_lat.ly_mutex); ksr->kr_nreq = sds[i].sdt_lat.ly_a_nreq; ksr->kr_sum = sds[i].sdt_lat.ly_a_sum; ksr->kr_a_mean = sds[i].sdt_lat.ly_a_mean; ksr->kr_a_stddev = sds[i].sdt_lat.ly_a_stddev; ksr->kr_d_mean = sds[i].sdt_lat.ly_d_mean; ksr->kr_d_stddev = sds[i].sdt_lat.ly_d_stddev; sds[i].sdt_lat.ly_d_mean = 0; sds[i].sdt_lat.ly_d_nreq = 0; sds[i].sdt_lat.ly_d_stddev = 0; sds[i].sdt_lat.ly_d_sum = 0; mutex_exit(&sds[i].sdt_lat.ly_mutex); } } }