[PATCH 001/308] cifsd: add server handler for central processing and tranport layers

From: Namjae Jeon namjae.jeon@samsung.com

mainline inclusion from mainline-5.15-rc1 commit 0626e6641f6b467447c81dd7678a69c66f7746cf category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I60T7G CVE: NA

Reference: https://git.kernel.org/torvalds/linux/c/0626e6641f6b

-------------------------------

This adds server handler for central processing, transport layers(tcp, rdma, ipc) and a document describing cifsd architecture.

Signed-off-by: Namjae Jeon namjae.jeon@samsung.com Signed-off-by: Sergey Senozhatsky sergey.senozhatsky@gmail.com Signed-off-by: Hyunchul Lee hyc.lee@gmail.com Acked-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Jason Yan yanaijie@huawei.com Signed-off-by: Zhong Jinghua zhongjinghua@huawei.com --- Documentation/filesystems/cifs/cifsd.rst | 136 ++ fs/cifsd/connection.c | 416 +++++ fs/cifsd/connection.h | 212 +++ fs/cifsd/glob.h | 67 + fs/cifsd/ksmbd_server.h | 285 +++ fs/cifsd/ksmbd_work.c | 93 + fs/cifsd/ksmbd_work.h | 124 ++ fs/cifsd/server.c | 635 +++++++ fs/cifsd/server.h | 62 + fs/cifsd/transport_ipc.c | 900 ++++++++++ fs/cifsd/transport_ipc.h | 63 + fs/cifsd/transport_rdma.c | 2050 ++++++++++++++++++++++ fs/cifsd/transport_rdma.h | 61 + fs/cifsd/transport_tcp.c | 624 +++++++ fs/cifsd/transport_tcp.h | 13 + 15 files changed, 5741 insertions(+) create mode 100644 Documentation/filesystems/cifs/cifsd.rst create mode 100644 fs/cifsd/connection.c create mode 100644 fs/cifsd/connection.h create mode 100644 fs/cifsd/glob.h create mode 100644 fs/cifsd/ksmbd_server.h create mode 100644 fs/cifsd/ksmbd_work.c create mode 100644 fs/cifsd/ksmbd_work.h create mode 100644 fs/cifsd/server.c create mode 100644 fs/cifsd/server.h create mode 100644 fs/cifsd/transport_ipc.c create mode 100644 fs/cifsd/transport_ipc.h create mode 100644 fs/cifsd/transport_rdma.c create mode 100644 fs/cifsd/transport_rdma.h create mode 100644 fs/cifsd/transport_tcp.c create mode 100644 fs/cifsd/transport_tcp.h

diff --git a/Documentation/filesystems/cifs/cifsd.rst b/Documentation/filesystems/cifs/cifsd.rst new file mode 100644 index 000000000000..e0c33d03f290 --- /dev/null +++ b/Documentation/filesystems/cifs/cifsd.rst @@ -0,0 +1,136 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= +CIFSD - SMB3 Kernel Server +========================= + +CIFSD is a linux kernel server which implements SMB3 protocol in kernel space +for sharing files over network. + +CIFSD architecture +================== + +The subset of performance related operations belong in kernelspace and +the other subset which belong to operations which are not really related with +performance in userspace. So, DCE/RPC management that has historically resulted +into number of buffer overflow issues and dangerous security bugs and user +account management are implemented in user space as ksmbd.mountd. +File operations that are related with performance (open/read/write/close etc.) +in kernel space (ksmbd). This also allows for easier integration with VFS +interface for all file operations. + +ksmbd (kernel daemon) +--------------------- + +When the server daemon is started, It starts up a forker thread +(ksmbd/interface name) at initialization time and open a dedicated port 445 +for listening to SMB requests. Whenever new clients make request, Forker +thread will accept the client connection and fork a new thread for dedicated +communication channel between the client and the server. It allows for parallel +processing of SMB requests(commands) from clients as well as allowing for new +clients to make new connections. Each instance is named ksmbd/1~n(port number) +to indicate connected clients. Depending on the SMB request types, each new +thread can decide to pass through the commands to the user space (ksmbd.mountd), +currently DCE/RPC commands are identified to be handled through the user space. +To further utilize the linux kernel, it has been chosen to process the commands +as workitems and to be executed in the handlers of the ksmbd-io kworker threads. +It allows for multiplexing of the handlers as the kernel take care of initiating +extra worker threads if the load is increased and vice versa, if the load is +decreased it destroys the extra worker threads. So, after connection is +established with client. Dedicated ksmbd/1..n(port number) takes complete +ownership of receiving/parsing of SMB commands. Each received command is worked +in parallel i.e., There can be multiple clients commands which are worked in +parallel. After receiving each command a separated kernel workitem is prepared +for each command which is further queued to be handled by ksmbd-io kworkers. +So, each SMB workitem is queued to the kworkers. This allows the benefit of load +sharing to be managed optimally by the default kernel and optimizing client +performance by handling client commands in parallel. + +ksmbd.mountd (user space daemon) +-------------------------------- + +ksmbd.mountd is userspace process to, transfer user account and password that +are registered using ksmbd.adduser(part of utils for user space). Further it +allows sharing information parameters that parsed from smb.conf to ksmbd in +kernel. For the execution part it has a daemon which is continuously running +and connected to the kernel interface using netlink socket, it waits for the +requests(dcerpc and share/user info). It handles RPC calls (at a minimum few +dozen) that are most important for file server from NetShareEnum and +NetServerGetInfo. Complete DCE/RPC response is prepared from the user space +and passed over to the associated kernel thread for the client. + +Key Features +============ + +The supported features are: + * SMB3 protocols for basic file sharing + * Auto negotiation + * Compound requests + * Oplock/Lease + * Large MTU + * NTLM/NTLMv2 + * HMAC-SHA256 Signing + * Secure negotiate + * Signing Update + * Pre-authentication integrity(SMB 3.1.1) + * SMB3 encryption(CCM, GCM) + * SMB direct(RDMA) + * SMB3.1.1 POSIX extension support + * ACLs + * Kerberos + +The features that are planned or not supported: + * SMB3 Multi-channel + * Durable handle v1,v2 + * Persistent handles + * Directory lease + * SMB2 notify + +How to run +========== + +1. Download ksmbd-tools and compile them. + - https://github.com/cifsd-team/ksmbd-tools + +2. Create user/password for SMB share. + + # mkdir /etc/ksmbd/ + # ksmbd.adduser -a <Enter USERNAME for SMB share access> + +3. Create /etc/ksmbd/smb.conf file, add SMB share in smb.conf file + - Refer smb.conf.example and Documentation/configuration.txt + in ksmbd-tools + +4. Insert ksmbd.ko module + + # insmod ksmbd.ko + +5. Start ksmbd user space daemon + # ksmbd.mountd + +6. Access share from Windows or Linux using CIFS + +Shutdown CIFSD +============== + +1. kill user and kernel space daemon + # sudo ksmbd.control -s + +How to turn debug print on +========================== + +Each layer +/sys/class/ksmbd-control/debug + +1. Enable all component prints + # sudo ksmbd.control -d "all" + +2. Enable one of components(smb, auth, vfs, oplock, ipc, conn, rdma) + # sudo ksmbd.control -d "smb" + +3. Show what prints are enable. + # cat/sys/class/ksmbd-control/debug + [smb] auth vfs oplock ipc conn [rdma] + +4. Disable prints: + If you try the selected component once more, It is disabled without brackets. diff --git a/fs/cifsd/connection.c b/fs/cifsd/connection.c new file mode 100644 index 000000000000..d27553dee2ad --- /dev/null +++ b/fs/cifsd/connection.c @@ -0,0 +1,416 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Namjae Jeon namjae.jeon@protocolfreedom.org + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#include <linux/mutex.h> +#include <linux/freezer.h> +#include <linux/module.h> + +#include "server.h" +#include "buffer_pool.h" +#include "smb_common.h" +#include "mgmt/ksmbd_ida.h" +#include "connection.h" +#include "transport_tcp.h" +#include "transport_rdma.h" + +static DEFINE_MUTEX(init_lock); + +static struct ksmbd_conn_ops default_conn_ops; + +static LIST_HEAD(conn_list); +static DEFINE_RWLOCK(conn_list_lock); + +/** + * ksmbd_conn_free() - free resources of the connection instance + * + * @conn: connection instance to be cleand up + * + * During the thread termination, the corresponding conn instance + * resources(sock/memory) are released and finally the conn object is freed. + */ +void ksmbd_conn_free(struct ksmbd_conn *conn) +{ + write_lock(&conn_list_lock); + list_del(&conn->conns_list); + write_unlock(&conn_list_lock); + + ksmbd_free_request(conn->request_buf); + ksmbd_ida_free(conn->async_ida); + kfree(conn->preauth_info); + kfree(conn); +} + +/** + * ksmbd_conn_alloc() - initialize a new connection instance + * + * Return: ksmbd_conn struct on success, otherwise NULL + */ +struct ksmbd_conn *ksmbd_conn_alloc(void) +{ + struct ksmbd_conn *conn; + + conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL); + if (!conn) + return NULL; + + conn->need_neg = true; + conn->status = KSMBD_SESS_NEW; + conn->local_nls = load_nls("utf8"); + if (!conn->local_nls) + conn->local_nls = load_nls_default(); + atomic_set(&conn->req_running, 0); + atomic_set(&conn->r_count, 0); + init_waitqueue_head(&conn->req_running_q); + INIT_LIST_HEAD(&conn->conns_list); + INIT_LIST_HEAD(&conn->sessions); + INIT_LIST_HEAD(&conn->requests); + INIT_LIST_HEAD(&conn->async_requests); + spin_lock_init(&conn->request_lock); + spin_lock_init(&conn->credits_lock); + conn->async_ida = ksmbd_ida_alloc(); + + write_lock(&conn_list_lock); + list_add(&conn->conns_list, &conn_list); + write_unlock(&conn_list_lock); + return conn; +} + +bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c) +{ + struct ksmbd_conn *t; + bool ret = false; + + read_lock(&conn_list_lock); + list_for_each_entry(t, &conn_list, conns_list) { + if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE)) + continue; + + ret = true; + break; + } + read_unlock(&conn_list_lock); + return ret; +} + +void ksmbd_conn_enqueue_request(struct ksmbd_work *work) +{ + struct ksmbd_conn *conn = work->conn; + struct list_head *requests_queue = NULL; + + if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) { + requests_queue = &conn->requests; + work->syncronous = true; + } + + if (requests_queue) { + atomic_inc(&conn->req_running); + spin_lock(&conn->request_lock); + list_add_tail(&work->request_entry, requests_queue); + spin_unlock(&conn->request_lock); + } +} + +int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work) +{ + struct ksmbd_conn *conn = work->conn; + int ret = 1; + + if (list_empty(&work->request_entry) && + list_empty(&work->async_request_entry)) + return 0; + + atomic_dec(&conn->req_running); + spin_lock(&conn->request_lock); + if (!work->multiRsp) { + list_del_init(&work->request_entry); + if (work->syncronous == false) + list_del_init(&work->async_request_entry); + ret = 0; + } + spin_unlock(&conn->request_lock); + + wake_up_all(&conn->req_running_q); + return ret; +} + +static void ksmbd_conn_lock(struct ksmbd_conn *conn) +{ + mutex_lock(&conn->srv_mutex); +} + +static void ksmbd_conn_unlock(struct ksmbd_conn *conn) +{ + mutex_unlock(&conn->srv_mutex); +} + +void ksmbd_conn_wait_idle(struct ksmbd_conn *conn) +{ + wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2); +} + +int ksmbd_conn_write(struct ksmbd_work *work) +{ + struct ksmbd_conn *conn = work->conn; + struct smb_hdr *rsp_hdr = RESPONSE_BUF(work); + size_t len = 0; + int sent; + struct kvec iov[3]; + int iov_idx = 0; + + ksmbd_conn_try_dequeue_request(work); + if (!rsp_hdr) { + ksmbd_err("NULL response header\n"); + return -EINVAL; + } + + if (HAS_TRANSFORM_BUF(work)) { + iov[iov_idx] = (struct kvec) { work->tr_buf, + sizeof(struct smb2_transform_hdr) }; + len += iov[iov_idx++].iov_len; + } + + if (HAS_AUX_PAYLOAD(work)) { + iov[iov_idx] = (struct kvec) { rsp_hdr, RESP_HDR_SIZE(work) }; + len += iov[iov_idx++].iov_len; + iov[iov_idx] = (struct kvec) { AUX_PAYLOAD(work), + AUX_PAYLOAD_SIZE(work) }; + len += iov[iov_idx++].iov_len; + } else { + if (HAS_TRANSFORM_BUF(work)) + iov[iov_idx].iov_len = RESP_HDR_SIZE(work); + else + iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4; + iov[iov_idx].iov_base = rsp_hdr; + len += iov[iov_idx++].iov_len; + } + + ksmbd_conn_lock(conn); + sent = conn->transport->ops->writev(conn->transport, &iov[0], + iov_idx, len, + work->need_invalidate_rkey, + work->remote_key); + ksmbd_conn_unlock(conn); + + if (sent < 0) { + ksmbd_err("Failed to send message: %d\n", sent); + return sent; + } + + return 0; +} + +int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len) +{ + int ret = -EINVAL; + + if (conn->transport->ops->rdma_read) + ret = conn->transport->ops->rdma_read(conn->transport, + buf, buflen, + remote_key, remote_offset, + remote_len); + return ret; +} + +int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len) +{ + int ret = -EINVAL; + + if (conn->transport->ops->rdma_write) + ret = conn->transport->ops->rdma_write(conn->transport, + buf, buflen, + remote_key, remote_offset, + remote_len); + return ret; +} + +bool ksmbd_conn_alive(struct ksmbd_conn *conn) +{ + if (!ksmbd_server_running()) + return false; + + if (conn->status == KSMBD_SESS_EXITING) + return false; + + if (kthread_should_stop()) + return false; + + if (atomic_read(&conn->stats.open_files_count) > 0) + return true; + + /* + * Stop current session if the time that get last request from client + * is bigger than deadtime user configured and openning file count is + * zero. + */ + if (server_conf.deadtime > 0 && + time_after(jiffies, conn->last_active + server_conf.deadtime)) { + ksmbd_debug(CONN, "No response from client in %lu minutes\n", + server_conf.deadtime / SMB_ECHO_INTERVAL); + return false; + } + return true; +} + +/** + * ksmbd_conn_handler_loop() - session thread to listen on new smb requests + * @p: connection instance + * + * One thread each per connection + * + * Return: 0 on success + */ +int ksmbd_conn_handler_loop(void *p) +{ + struct ksmbd_conn *conn = (struct ksmbd_conn *)p; + struct ksmbd_transport *t = conn->transport; + unsigned int pdu_size; + char hdr_buf[4] = {0,}; + int size; + + mutex_init(&conn->srv_mutex); + __module_get(THIS_MODULE); + + if (t->ops->prepare && t->ops->prepare(t)) + goto out; + + conn->last_active = jiffies; + while (ksmbd_conn_alive(conn)) { + if (try_to_freeze()) + continue; + + ksmbd_free_request(conn->request_buf); + conn->request_buf = NULL; + + size = t->ops->read(t, hdr_buf, sizeof(hdr_buf)); + if (size != sizeof(hdr_buf)) + break; + + pdu_size = get_rfc1002_len(hdr_buf); + ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size); + + /* make sure we have enough to get to SMB header end */ + if (!ksmbd_pdu_size_has_room(pdu_size)) { + ksmbd_debug(CONN, "SMB request too short (%u bytes)\n", + pdu_size); + continue; + } + + /* 4 for rfc1002 length field */ + size = pdu_size + 4; + conn->request_buf = ksmbd_alloc_request(size); + if (!conn->request_buf) + continue; + + memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf)); + if (!ksmbd_smb_request(conn)) + break; + + /* + * We already read 4 bytes to find out PDU size, now + * read in PDU + */ + size = t->ops->read(t, conn->request_buf + 4, pdu_size); + if (size < 0) { + ksmbd_err("sock_read failed: %d\n", size); + break; + } + + if (size != pdu_size) { + ksmbd_err("PDU error. Read: %d, Expected: %d\n", + size, + pdu_size); + continue; + } + + if (!default_conn_ops.process_fn) { + ksmbd_err("No connection request callback\n"); + break; + } + + if (default_conn_ops.process_fn(conn)) { + ksmbd_err("Cannot handle request\n"); + break; + } + } + +out: + /* Wait till all reference dropped to the Server object*/ + while (atomic_read(&conn->r_count) > 0) + schedule_timeout(HZ); + + unload_nls(conn->local_nls); + if (default_conn_ops.terminate_fn) + default_conn_ops.terminate_fn(conn); + t->ops->disconnect(t); + module_put(THIS_MODULE); + return 0; +} + +void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops) +{ + default_conn_ops.process_fn = ops->process_fn; + default_conn_ops.terminate_fn = ops->terminate_fn; +} + +int ksmbd_conn_transport_init(void) +{ + int ret; + + mutex_lock(&init_lock); + ret = ksmbd_tcp_init(); + if (ret) { + pr_err("Failed to init TCP subsystem: %d\n", ret); + goto out; + } + + ret = ksmbd_rdma_init(); + if (ret) { + pr_err("Failed to init KSMBD subsystem: %d\n", ret); + goto out; + } +out: + mutex_unlock(&init_lock); + return ret; +} + +static void stop_sessions(void) +{ + struct ksmbd_conn *conn; + +again: + read_lock(&conn_list_lock); + list_for_each_entry(conn, &conn_list, conns_list) { + struct task_struct *task; + + task = conn->transport->handler; + if (task) + ksmbd_debug(CONN, "Stop session handler %s/%d\n", + task->comm, + task_pid_nr(task)); + conn->status = KSMBD_SESS_EXITING; + } + read_unlock(&conn_list_lock); + + if (!list_empty(&conn_list)) { + schedule_timeout_interruptible(HZ/10); /* 100ms */ + goto again; + } +} + +void ksmbd_conn_transport_destroy(void) +{ + mutex_lock(&init_lock); + ksmbd_tcp_destroy(); + ksmbd_rdma_destroy(); + stop_sessions(); + mutex_unlock(&init_lock); +} diff --git a/fs/cifsd/connection.h b/fs/cifsd/connection.h new file mode 100644 index 000000000000..179fb9278999 --- /dev/null +++ b/fs/cifsd/connection.h @@ -0,0 +1,212 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_CONNECTION_H__ +#define __KSMBD_CONNECTION_H__ + +#include <linux/list.h> +#include <linux/ip.h> +#include <net/sock.h> +#include <net/tcp.h> +#include <net/inet_connection_sock.h> +#include <net/request_sock.h> +#include <linux/kthread.h> +#include <linux/nls.h> + +#include "smb_common.h" +#include "ksmbd_work.h" + +#define KSMBD_SOCKET_BACKLOG 16 + +/* + * WARNING + * + * This is nothing but a HACK. Session status should move to channel + * or to session. As of now we have 1 tcp_conn : 1 ksmbd_session, but + * we need to change it to 1 tcp_conn : N ksmbd_sessions. + */ +enum { + KSMBD_SESS_NEW = 0, + KSMBD_SESS_GOOD, + KSMBD_SESS_EXITING, + KSMBD_SESS_NEED_RECONNECT, + KSMBD_SESS_NEED_NEGOTIATE +}; + +struct ksmbd_stats { + atomic_t open_files_count; + atomic64_t request_served; +}; + +struct ksmbd_transport; + +struct ksmbd_conn { + struct smb_version_values *vals; + struct smb_version_ops *ops; + struct smb_version_cmds *cmds; + unsigned int max_cmds; + struct mutex srv_mutex; + int status; + unsigned int cli_cap; + char *request_buf; + struct ksmbd_transport *transport; + struct nls_table *local_nls; + struct list_head conns_list; + /* smb session 1 per user */ + struct list_head sessions; + unsigned long last_active; + /* How many request are running currently */ + atomic_t req_running; + /* References which are made for this Server object*/ + atomic_t r_count; + unsigned short total_credits; + unsigned short max_credits; + spinlock_t credits_lock; + wait_queue_head_t req_running_q; + /* Lock to protect requests list*/ + spinlock_t request_lock; + struct list_head requests; + struct list_head async_requests; + int connection_type; + struct ksmbd_stats stats; + char ClientGUID[SMB2_CLIENT_GUID_SIZE]; + union { + /* pending trans request table */ + struct trans_state *recent_trans; + /* Used by ntlmssp */ + char *ntlmssp_cryptkey; + }; + + struct preauth_integrity_info *preauth_info; + + bool need_neg; + unsigned int auth_mechs; + unsigned int preferred_auth_mech; + bool sign; + bool use_spnego:1; + __u16 cli_sec_mode; + __u16 srv_sec_mode; + /* dialect index that server chose */ + __u16 dialect; + + char *mechToken; + + struct ksmbd_conn_ops *conn_ops; + + /* Preauth Session Table */ + struct list_head preauth_sess_table; + + struct sockaddr_storage peer_addr; + + /* Identifier for async message */ + struct ksmbd_ida *async_ida; + + __le16 cipher_type; + __le16 compress_algorithm; + bool posix_ext_supported; +}; + +struct ksmbd_conn_ops { + int (*process_fn)(struct ksmbd_conn *conn); + int (*terminate_fn)(struct ksmbd_conn *conn); +}; + +struct ksmbd_transport_ops { + int (*prepare)(struct ksmbd_transport *t); + void (*disconnect)(struct ksmbd_transport *t); + int (*read)(struct ksmbd_transport *t, + char *buf, unsigned int size); + int (*writev)(struct ksmbd_transport *t, + struct kvec *iovs, int niov, int size, + bool need_invalidate_rkey, unsigned int remote_key); + int (*rdma_read)(struct ksmbd_transport *t, + void *buf, unsigned int len, u32 remote_key, + u64 remote_offset, u32 remote_len); + int (*rdma_write)(struct ksmbd_transport *t, + void *buf, unsigned int len, u32 remote_key, + u64 remote_offset, u32 remote_len); +}; + +struct ksmbd_transport { + struct ksmbd_conn *conn; + struct ksmbd_transport_ops *ops; + struct task_struct *handler; +}; + +#define KSMBD_TCP_RECV_TIMEOUT (7 * HZ) +#define KSMBD_TCP_SEND_TIMEOUT (5 * HZ) +#define KSMBD_TCP_PEER_SOCKADDR(c) ((struct sockaddr *)&((c)->peer_addr)) + +bool ksmbd_conn_alive(struct ksmbd_conn *conn); +void ksmbd_conn_wait_idle(struct ksmbd_conn *conn); + +struct ksmbd_conn *ksmbd_conn_alloc(void); +void ksmbd_conn_free(struct ksmbd_conn *conn); +bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c); +int ksmbd_conn_write(struct ksmbd_work *work); +int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len); +int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len); + +void ksmbd_conn_enqueue_request(struct ksmbd_work *work); +int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work); +void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops); + +int ksmbd_conn_handler_loop(void *p); + +int ksmbd_conn_transport_init(void); +void ksmbd_conn_transport_destroy(void); + +/* + * WARNING + * + * This is a hack. We will move status to a proper place once we land + * a multi-sessions support. + */ +static inline bool ksmbd_conn_good(struct ksmbd_work *work) +{ + return work->conn->status == KSMBD_SESS_GOOD; +} + +static inline bool ksmbd_conn_need_negotiate(struct ksmbd_work *work) +{ + return work->conn->status == KSMBD_SESS_NEED_NEGOTIATE; +} + +static inline bool ksmbd_conn_need_reconnect(struct ksmbd_work *work) +{ + return work->conn->status == KSMBD_SESS_NEED_RECONNECT; +} + +static inline bool ksmbd_conn_exiting(struct ksmbd_work *work) +{ + return work->conn->status == KSMBD_SESS_EXITING; +} + +static inline void ksmbd_conn_set_good(struct ksmbd_work *work) +{ + work->conn->status = KSMBD_SESS_GOOD; +} + +static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_work *work) +{ + work->conn->status = KSMBD_SESS_NEED_NEGOTIATE; +} + +static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_work *work) +{ + work->conn->status = KSMBD_SESS_NEED_RECONNECT; +} + +static inline void ksmbd_conn_set_exiting(struct ksmbd_work *work) +{ + work->conn->status = KSMBD_SESS_EXITING; +} +#endif /* __CONNECTION_H__ */ diff --git a/fs/cifsd/glob.h b/fs/cifsd/glob.h new file mode 100644 index 000000000000..2dc3f603e837 --- /dev/null +++ b/fs/cifsd/glob.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2016 Namjae Jeon linkinjeon@kernel.org + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_GLOB_H +#define __KSMBD_GLOB_H + +#include <linux/ctype.h> +#include <linux/version.h> + +#include "unicode.h" +#include "vfs_cache.h" +#include "smberr.h" + +#define KSMBD_VERSION "3.1.9" + +/* @FIXME clean up this code */ + +extern int ksmbd_debug_types; +extern int ksmbd_caseless_search; + +#define DATA_STREAM 1 +#define DIR_STREAM 2 + +#define KSMBD_DEBUG_SMB (1 << 0) +#define KSMBD_DEBUG_AUTH (1 << 1) +#define KSMBD_DEBUG_VFS (1 << 2) +#define KSMBD_DEBUG_OPLOCK (1 << 3) +#define KSMBD_DEBUG_IPC (1 << 4) +#define KSMBD_DEBUG_CONN (1 << 5) +#define KSMBD_DEBUG_RDMA (1 << 6) +#define KSMBD_DEBUG_ALL (KSMBD_DEBUG_SMB | KSMBD_DEBUG_AUTH | \ + KSMBD_DEBUG_VFS | KSMBD_DEBUG_OPLOCK | \ + KSMBD_DEBUG_IPC | KSMBD_DEBUG_CONN | \ + KSMBD_DEBUG_RDMA) + +#ifndef ksmbd_pr_fmt +#ifdef SUBMOD_NAME +#define ksmbd_pr_fmt(fmt) "ksmbd: " SUBMOD_NAME ": " fmt +#else +#define ksmbd_pr_fmt(fmt) "ksmbd: " fmt +#endif +#endif + +#define ksmbd_debug(type, fmt, ...) \ + do { \ + if (ksmbd_debug_types & KSMBD_DEBUG_##type) \ + pr_info(ksmbd_pr_fmt("%s:%d: " fmt), \ + __func__, \ + __LINE__, \ + ##__VA_ARGS__); \ + } while (0) + +#define ksmbd_info(fmt, ...) \ + pr_info(ksmbd_pr_fmt(fmt), ##__VA_ARGS__) + +#define ksmbd_err(fmt, ...) \ + pr_err(ksmbd_pr_fmt("%s:%d: " fmt), \ + __func__, \ + __LINE__, \ + ##__VA_ARGS__) + +#define UNICODE_LEN(x) ((x) * 2) + +#endif /* __KSMBD_GLOB_H */ diff --git a/fs/cifsd/ksmbd_server.h b/fs/cifsd/ksmbd_server.h new file mode 100644 index 000000000000..01eaf9ec4fde --- /dev/null +++ b/fs/cifsd/ksmbd_server.h @@ -0,0 +1,285 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + * + * linux-ksmbd-devel@lists.sourceforge.net + */ + +#ifndef _LINUX_KSMBD_SERVER_H +#define _LINUX_KSMBD_SERVER_H + +#include <linux/types.h> + +#define KSMBD_GENL_NAME "SMBD_GENL" +#define KSMBD_GENL_VERSION 0x01 + +#ifndef ____ksmbd_align +#define ____ksmbd_align __aligned(4) +#endif + +#define KSMBD_REQ_MAX_ACCOUNT_NAME_SZ 48 +#define KSMBD_REQ_MAX_HASH_SZ 18 +#define KSMBD_REQ_MAX_SHARE_NAME 64 + +struct ksmbd_heartbeat { + __u32 handle; +}; + +/* + * Global config flags. + */ +#define KSMBD_GLOBAL_FLAG_INVALID (0) +#define KSMBD_GLOBAL_FLAG_SMB2_LEASES (1 << 0) +#define KSMBD_GLOBAL_FLAG_CACHE_TBUF (1 << 1) +#define KSMBD_GLOBAL_FLAG_CACHE_RBUF (1 << 2) +#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION (1 << 3) +#define KSMBD_GLOBAL_FLAG_DURABLE_HANDLE (1 << 4) + +struct ksmbd_startup_request { + __u32 flags; + __s32 signing; + __s8 min_prot[16]; + __s8 max_prot[16]; + __s8 netbios_name[16]; + __s8 work_group[64]; + __s8 server_string[64]; + __u16 tcp_port; + __u16 ipc_timeout; + __u32 deadtime; + __u32 file_max; + __u32 smb2_max_write; + __u32 smb2_max_read; + __u32 smb2_max_trans; + __u32 share_fake_fscaps; + __u32 sub_auth[3]; + __u32 ifc_list_sz; + __s8 ____payload[0]; +} ____ksmbd_align; + +#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload) + +struct ksmbd_shutdown_request { + __s32 reserved; +} ____ksmbd_align; + +struct ksmbd_login_request { + __u32 handle; + __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; +} ____ksmbd_align; + +struct ksmbd_login_response { + __u32 handle; + __u32 gid; + __u32 uid; + __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; + __u16 status; + __u16 hash_sz; + __s8 hash[KSMBD_REQ_MAX_HASH_SZ]; +} ____ksmbd_align; + +struct ksmbd_share_config_request { + __u32 handle; + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; +} ____ksmbd_align; + +struct ksmbd_share_config_response { + __u32 handle; + __u32 flags; + __u16 create_mask; + __u16 directory_mask; + __u16 force_create_mode; + __u16 force_directory_mode; + __u16 force_uid; + __u16 force_gid; + __u32 veto_list_sz; + __s8 ____payload[0]; +} ____ksmbd_align; + +#define KSMBD_SHARE_CONFIG_VETO_LIST(s) ((s)->____payload) +#define KSMBD_SHARE_CONFIG_PATH(s) \ + ({ \ + char *p = (s)->____payload; \ + if ((s)->veto_list_sz) \ + p += (s)->veto_list_sz + 1; \ + p; \ + }) + +struct ksmbd_tree_connect_request { + __u32 handle; + __u16 account_flags; + __u16 flags; + __u64 session_id; + __u64 connect_id; + __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; + __s8 share[KSMBD_REQ_MAX_SHARE_NAME]; + __s8 peer_addr[64]; +} ____ksmbd_align; + +struct ksmbd_tree_connect_response { + __u32 handle; + __u16 status; + __u16 connection_flags; +} ____ksmbd_align; + +struct ksmbd_tree_disconnect_request { + __u64 session_id; + __u64 connect_id; +} ____ksmbd_align; + +struct ksmbd_logout_request { + __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; +} ____ksmbd_align; + +struct ksmbd_rpc_command { + __u32 handle; + __u32 flags; + __u32 payload_sz; + __u8 payload[0]; +} ____ksmbd_align; + +struct ksmbd_spnego_authen_request { + __u32 handle; + __u16 spnego_blob_len; + __u8 spnego_blob[0]; +} ____ksmbd_align; + +struct ksmbd_spnego_authen_response { + __u32 handle; + struct ksmbd_login_response login_response; + __u16 session_key_len; + __u16 spnego_blob_len; + __u8 payload[0]; /* session key + AP_REP */ +} ____ksmbd_align; + +/* + * This also used as NETLINK attribute type value. + * + * NOTE: + * Response message type value should be equal to + * request message type value + 1. + */ +enum ksmbd_event { + KSMBD_EVENT_UNSPEC = 0, + KSMBD_EVENT_HEARTBEAT_REQUEST, + + KSMBD_EVENT_STARTING_UP, + KSMBD_EVENT_SHUTTING_DOWN, + + KSMBD_EVENT_LOGIN_REQUEST, + KSMBD_EVENT_LOGIN_RESPONSE = 5, + + KSMBD_EVENT_SHARE_CONFIG_REQUEST, + KSMBD_EVENT_SHARE_CONFIG_RESPONSE, + + KSMBD_EVENT_TREE_CONNECT_REQUEST, + KSMBD_EVENT_TREE_CONNECT_RESPONSE, + + KSMBD_EVENT_TREE_DISCONNECT_REQUEST = 10, + + KSMBD_EVENT_LOGOUT_REQUEST, + + KSMBD_EVENT_RPC_REQUEST, + KSMBD_EVENT_RPC_RESPONSE, + + KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST, + KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE = 15, + + KSMBD_EVENT_MAX +}; + +enum KSMBD_TREE_CONN_STATUS { + KSMBD_TREE_CONN_STATUS_OK = 0, + KSMBD_TREE_CONN_STATUS_NOMEM, + KSMBD_TREE_CONN_STATUS_NO_SHARE, + KSMBD_TREE_CONN_STATUS_NO_USER, + KSMBD_TREE_CONN_STATUS_INVALID_USER, + KSMBD_TREE_CONN_STATUS_HOST_DENIED = 5, + KSMBD_TREE_CONN_STATUS_CONN_EXIST, + KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS, + KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS, + KSMBD_TREE_CONN_STATUS_ERROR, +}; + +/* + * User config flags. + */ +#define KSMBD_USER_FLAG_INVALID (0) +#define KSMBD_USER_FLAG_OK (1 << 0) +#define KSMBD_USER_FLAG_BAD_PASSWORD (1 << 1) +#define KSMBD_USER_FLAG_BAD_UID (1 << 2) +#define KSMBD_USER_FLAG_BAD_USER (1 << 3) +#define KSMBD_USER_FLAG_GUEST_ACCOUNT (1 << 4) + +/* + * Share config flags. + */ +#define KSMBD_SHARE_FLAG_INVALID (0) +#define KSMBD_SHARE_FLAG_AVAILABLE (1 << 0) +#define KSMBD_SHARE_FLAG_BROWSEABLE (1 << 1) +#define KSMBD_SHARE_FLAG_WRITEABLE (1 << 2) +#define KSMBD_SHARE_FLAG_READONLY (1 << 3) +#define KSMBD_SHARE_FLAG_GUEST_OK (1 << 4) +#define KSMBD_SHARE_FLAG_GUEST_ONLY (1 << 5) +#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS (1 << 6) +#define KSMBD_SHARE_FLAG_OPLOCKS (1 << 7) +#define KSMBD_SHARE_FLAG_PIPE (1 << 8) +#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES (1 << 9) +#define KSMBD_SHARE_FLAG_INHERIT_SMACK (1 << 10) +#define KSMBD_SHARE_FLAG_INHERIT_OWNER (1 << 11) +#define KSMBD_SHARE_FLAG_STREAMS (1 << 12) +#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS (1 << 13) +#define KSMBD_SHARE_FLAG_ACL_XATTR (1 << 14) + +/* + * Tree connect request flags. + */ +#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB1 (0) +#define KSMBD_TREE_CONN_FLAG_REQUEST_IPV6 (1 << 0) +#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB2 (1 << 1) + +/* + * Tree connect flags. + */ +#define KSMBD_TREE_CONN_FLAG_GUEST_ACCOUNT (1 << 0) +#define KSMBD_TREE_CONN_FLAG_READ_ONLY (1 << 1) +#define KSMBD_TREE_CONN_FLAG_WRITABLE (1 << 2) +#define KSMBD_TREE_CONN_FLAG_ADMIN_ACCOUNT (1 << 3) + +/* + * RPC over IPC. + */ +#define KSMBD_RPC_METHOD_RETURN (1 << 0) +#define KSMBD_RPC_SRVSVC_METHOD_INVOKE (1 << 1) +#define KSMBD_RPC_SRVSVC_METHOD_RETURN ((1 << 1) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_WKSSVC_METHOD_INVOKE (1 << 2) +#define KSMBD_RPC_WKSSVC_METHOD_RETURN ((1 << 2) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_IOCTL_METHOD ((1 << 3) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_OPEN_METHOD (1 << 4) +#define KSMBD_RPC_WRITE_METHOD (1 << 5) +#define KSMBD_RPC_READ_METHOD ((1 << 6) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_CLOSE_METHOD (1 << 7) +#define KSMBD_RPC_RAP_METHOD ((1 << 8) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_RESTRICTED_CONTEXT (1 << 9) +#define KSMBD_RPC_SAMR_METHOD_INVOKE (1 << 10) +#define KSMBD_RPC_SAMR_METHOD_RETURN ((1 << 10) | KSMBD_RPC_METHOD_RETURN) +#define KSMBD_RPC_LSARPC_METHOD_INVOKE (1 << 11) +#define KSMBD_RPC_LSARPC_METHOD_RETURN ((1 << 11) | KSMBD_RPC_METHOD_RETURN) + +#define KSMBD_RPC_OK 0 +#define KSMBD_RPC_EBAD_FUNC 0x00000001 +#define KSMBD_RPC_EACCESS_DENIED 0x00000005 +#define KSMBD_RPC_EBAD_FID 0x00000006 +#define KSMBD_RPC_ENOMEM 0x00000008 +#define KSMBD_RPC_EBAD_DATA 0x0000000D +#define KSMBD_RPC_ENOTIMPLEMENTED 0x00000040 +#define KSMBD_RPC_EINVALID_PARAMETER 0x00000057 +#define KSMBD_RPC_EMORE_DATA 0x000000EA +#define KSMBD_RPC_EINVALID_LEVEL 0x0000007C +#define KSMBD_RPC_SOME_NOT_MAPPED 0x00000107 + +#define KSMBD_CONFIG_OPT_DISABLED 0 +#define KSMBD_CONFIG_OPT_ENABLED 1 +#define KSMBD_CONFIG_OPT_AUTO 2 +#define KSMBD_CONFIG_OPT_MANDATORY 3 + +#endif /* _LINUX_KSMBD_SERVER_H */ diff --git a/fs/cifsd/ksmbd_work.c b/fs/cifsd/ksmbd_work.c new file mode 100644 index 000000000000..8cd5dff0762d --- /dev/null +++ b/fs/cifsd/ksmbd_work.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2019 Samsung Electronics Co., Ltd. + */ + +#include <linux/list.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +#include "server.h" +#include "connection.h" +#include "ksmbd_work.h" +#include "buffer_pool.h" +#include "mgmt/ksmbd_ida.h" + +/* @FIXME */ +#include "ksmbd_server.h" + +static struct kmem_cache *work_cache; +static struct workqueue_struct *ksmbd_wq; + +struct ksmbd_work *ksmbd_alloc_work_struct(void) +{ + struct ksmbd_work *work = kmem_cache_zalloc(work_cache, GFP_KERNEL); + + if (work) { + work->compound_fid = KSMBD_NO_FID; + work->compound_pfid = KSMBD_NO_FID; + INIT_LIST_HEAD(&work->request_entry); + INIT_LIST_HEAD(&work->async_request_entry); + INIT_LIST_HEAD(&work->fp_entry); + INIT_LIST_HEAD(&work->interim_entry); + } + return work; +} + +void ksmbd_free_work_struct(struct ksmbd_work *work) +{ + WARN_ON(work->saved_cred != NULL); + if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_TBUF && + work->set_trans_buf) + ksmbd_release_buffer(RESPONSE_BUF(work)); + else + ksmbd_free_response(RESPONSE_BUF(work)); + + if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_RBUF && + work->set_read_buf) + ksmbd_release_buffer(AUX_PAYLOAD(work)); + else + ksmbd_free_response(AUX_PAYLOAD(work)); + + ksmbd_free_response(TRANSFORM_BUF(work)); + ksmbd_free_request(REQUEST_BUF(work)); + if (work->async_id) + ksmbd_release_id(work->conn->async_ida, work->async_id); + kmem_cache_free(work_cache, work); +} + +void ksmbd_work_pool_destroy(void) +{ + kmem_cache_destroy(work_cache); +} + +int ksmbd_work_pool_init(void) +{ + work_cache = kmem_cache_create("ksmbd_work_cache", + sizeof(struct ksmbd_work), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!work_cache) + return -ENOMEM; + return 0; +} + +int ksmbd_workqueue_init(void) +{ + ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0); + if (!ksmbd_wq) + return -ENOMEM; + return 0; +} + +void ksmbd_workqueue_destroy(void) +{ + flush_workqueue(ksmbd_wq); + destroy_workqueue(ksmbd_wq); + ksmbd_wq = NULL; +} + +bool ksmbd_queue_work(struct ksmbd_work *work) +{ + return queue_work(ksmbd_wq, &work->work); +} diff --git a/fs/cifsd/ksmbd_work.h b/fs/cifsd/ksmbd_work.h new file mode 100644 index 000000000000..405434d4c8ab --- /dev/null +++ b/fs/cifsd/ksmbd_work.h @@ -0,0 +1,124 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2019 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_WORK_H__ +#define __KSMBD_WORK_H__ + +#include <linux/ctype.h> +#include <linux/workqueue.h> + +struct ksmbd_conn; +struct ksmbd_session; +struct ksmbd_tree_connect; + +enum { + KSMBD_WORK_ACTIVE = 0, + KSMBD_WORK_CANCELLED, + KSMBD_WORK_CLOSED, +}; + +/* one of these for every pending CIFS request at the connection */ +struct ksmbd_work { + /* Server corresponding to this mid */ + struct ksmbd_conn *conn; + struct ksmbd_session *sess; + struct ksmbd_tree_connect *tcon; + + /* Pointer to received SMB header */ + char *request_buf; + /* Response buffer */ + char *response_buf; + + /* Read data buffer */ + char *aux_payload_buf; + + /* Next cmd hdr in compound req buf*/ + int next_smb2_rcv_hdr_off; + /* Next cmd hdr in compound rsp buf*/ + int next_smb2_rsp_hdr_off; + + /* + * Current Local FID assigned compound response if SMB2 CREATE + * command is present in compound request + */ + unsigned int compound_fid; + unsigned int compound_pfid; + unsigned int compound_sid; + + const struct cred *saved_cred; + + /* Number of granted credits */ + unsigned int credits_granted; + + /* response smb header size */ + unsigned int resp_hdr_sz; + unsigned int response_sz; + /* Read data count */ + unsigned int aux_payload_sz; + + void *tr_buf; + + unsigned char state; + /* Multiple responses for one request e.g. SMB ECHO */ + bool multiRsp:1; + /* No response for cancelled request */ + bool send_no_response:1; + /* Request is encrypted */ + bool encrypted:1; + /* Is this SYNC or ASYNC ksmbd_work */ + bool syncronous:1; + bool need_invalidate_rkey:1; + bool set_trans_buf:1; + bool set_read_buf:1; + + unsigned int remote_key; + /* cancel works */ + int async_id; + void **cancel_argv; + void (*cancel_fn)(void **argv); + + struct work_struct work; + /* List head at conn->requests */ + struct list_head request_entry; + /* List head at conn->async_requests */ + struct list_head async_request_entry; + struct list_head fp_entry; + struct list_head interim_entry; +}; + +#define WORK_CANCELLED(w) ((w)->state == KSMBD_WORK_CANCELLED) +#define WORK_CLOSED(w) ((w)->state == KSMBD_WORK_CLOSED) +#define WORK_ACTIVE(w) ((w)->state == KSMBD_WORK_ACTIVE) + +#define RESPONSE_BUF(w) ((void *)(w)->response_buf) +#define REQUEST_BUF(w) ((void *)(w)->request_buf) + +#define RESPONSE_BUF_NEXT(w) \ + ((void *)((w)->response_buf + (w)->next_smb2_rsp_hdr_off)) +#define REQUEST_BUF_NEXT(w) \ + ((void *)((w)->request_buf + (w)->next_smb2_rcv_hdr_off)) + +#define RESPONSE_SZ(w) ((w)->response_sz) + +#define INIT_AUX_PAYLOAD(w) ((w)->aux_payload_buf = NULL) +#define HAS_AUX_PAYLOAD(w) ((w)->aux_payload_sz != 0) +#define AUX_PAYLOAD(w) ((void *)((w)->aux_payload_buf)) +#define AUX_PAYLOAD_SIZE(w) ((w)->aux_payload_sz) +#define RESP_HDR_SIZE(w) ((w)->resp_hdr_sz) + +#define HAS_TRANSFORM_BUF(w) ((w)->tr_buf != NULL) +#define TRANSFORM_BUF(w) ((void *)((w)->tr_buf)) + +struct ksmbd_work *ksmbd_alloc_work_struct(void); +void ksmbd_free_work_struct(struct ksmbd_work *work); + +void ksmbd_work_pool_destroy(void); +int ksmbd_work_pool_init(void); + +int ksmbd_workqueue_init(void); +void ksmbd_workqueue_destroy(void); +bool ksmbd_queue_work(struct ksmbd_work *work); + +#endif /* __KSMBD_WORK_H__ */ diff --git a/fs/cifsd/server.c b/fs/cifsd/server.c new file mode 100644 index 000000000000..b9e114f8a5d2 --- /dev/null +++ b/fs/cifsd/server.c @@ -0,0 +1,635 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Namjae Jeon linkinjeon@kernel.org + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#include "glob.h" +#include "oplock.h" +#include "misc.h" +#include <linux/sched/signal.h> +#include <linux/workqueue.h> +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/moduleparam.h> + +#include "server.h" +#include "smb_common.h" +#include "smbstatus.h" +#include "buffer_pool.h" +#include "connection.h" +#include "transport_ipc.h" +#include "mgmt/user_session.h" +#include "crypto_ctx.h" +#include "auth.h" + +int ksmbd_debug_types; + +struct ksmbd_server_config server_conf; + +enum SERVER_CTRL_TYPE { + SERVER_CTRL_TYPE_INIT, + SERVER_CTRL_TYPE_RESET, +}; + +struct server_ctrl_struct { + int type; + struct work_struct ctrl_work; +}; + +static DEFINE_MUTEX(ctrl_lock); + +static int ___server_conf_set(int idx, char *val) +{ + if (idx >= ARRAY_SIZE(server_conf.conf)) + return -EINVAL; + + if (!val || val[0] == 0x00) + return -EINVAL; + + kfree(server_conf.conf[idx]); + server_conf.conf[idx] = kstrdup(val, GFP_KERNEL); + if (!server_conf.conf[idx]) + return -ENOMEM; + return 0; +} + +int ksmbd_set_netbios_name(char *v) +{ + return ___server_conf_set(SERVER_CONF_NETBIOS_NAME, v); +} + +int ksmbd_set_server_string(char *v) +{ + return ___server_conf_set(SERVER_CONF_SERVER_STRING, v); +} + +int ksmbd_set_work_group(char *v) +{ + return ___server_conf_set(SERVER_CONF_WORK_GROUP, v); +} + +char *ksmbd_netbios_name(void) +{ + return server_conf.conf[SERVER_CONF_NETBIOS_NAME]; +} + +char *ksmbd_server_string(void) +{ + return server_conf.conf[SERVER_CONF_SERVER_STRING]; +} + +char *ksmbd_work_group(void) +{ + return server_conf.conf[SERVER_CONF_WORK_GROUP]; +} + +/** + * check_conn_state() - check state of server thread connection + * @ksmbd_work: smb work containing server thread information + * + * Return: 0 on valid connection, otherwise 1 to reconnect + */ +static inline int check_conn_state(struct ksmbd_work *work) +{ + struct smb_hdr *rsp_hdr; + + if (ksmbd_conn_exiting(work) || ksmbd_conn_need_reconnect(work)) { + rsp_hdr = RESPONSE_BUF(work); + rsp_hdr->Status.CifsError = STATUS_CONNECTION_DISCONNECTED; + return 1; + } + return 0; +} + +/* @FIXME what a mess... god help. */ + +#define TCP_HANDLER_CONTINUE 0 +#define TCP_HANDLER_ABORT 1 + +static int __process_request(struct ksmbd_work *work, + struct ksmbd_conn *conn, + uint16_t *cmd) +{ + struct smb_version_cmds *cmds; + uint16_t command; + int ret; + + if (check_conn_state(work)) + return TCP_HANDLER_CONTINUE; + + if (ksmbd_verify_smb_message(work)) + return TCP_HANDLER_ABORT; + + command = conn->ops->get_cmd_val(work); + *cmd = command; + +andx_again: + if (command >= conn->max_cmds) { + conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER); + return TCP_HANDLER_CONTINUE; + } + + cmds = &conn->cmds[command]; + if (!cmds->proc) { + ksmbd_debug(SMB, "*** not implemented yet cmd = %x\n", command); + conn->ops->set_rsp_status(work, STATUS_NOT_IMPLEMENTED); + return TCP_HANDLER_CONTINUE; + } + + if (work->sess && conn->ops->is_sign_req(work, command)) { + ret = conn->ops->check_sign_req(work); + if (!ret) { + conn->ops->set_rsp_status(work, STATUS_ACCESS_DENIED); + return TCP_HANDLER_CONTINUE; + } + } + + ret = cmds->proc(work); + + if (ret < 0) + ksmbd_debug(CONN, "Failed to process %u [%d]\n", command, ret); + /* AndX commands - chained request can return positive values */ + else if (ret > 0) { + command = ret; + *cmd = command; + goto andx_again; + } + + if (work->send_no_response) + return TCP_HANDLER_ABORT; + return TCP_HANDLER_CONTINUE; +} + +static void __handle_ksmbd_work(struct ksmbd_work *work, + struct ksmbd_conn *conn) +{ + uint16_t command = 0; + int rc; + + if (conn->ops->allocate_rsp_buf(work)) + return; + + if (conn->ops->is_transform_hdr && + conn->ops->is_transform_hdr(REQUEST_BUF(work))) { + rc = conn->ops->decrypt_req(work); + if (rc < 0) { + conn->ops->set_rsp_status(work, STATUS_DATA_ERROR); + goto send; + } + + work->encrypted = true; + } + + rc = conn->ops->init_rsp_hdr(work); + if (rc) { + /* either uid or tid is not correct */ + conn->ops->set_rsp_status(work, STATUS_INVALID_HANDLE); + goto send; + } + + if (conn->ops->check_user_session) { + rc = conn->ops->check_user_session(work); + if (rc < 0) { + command = conn->ops->get_cmd_val(work); + conn->ops->set_rsp_status(work, + STATUS_USER_SESSION_DELETED); + goto send; + } else if (rc > 0) { + rc = conn->ops->get_ksmbd_tcon(work); + if (rc < 0) { + conn->ops->set_rsp_status(work, + STATUS_NETWORK_NAME_DELETED); + goto send; + } + } + } + + do { + rc = __process_request(work, conn, &command); + if (rc == TCP_HANDLER_ABORT) + break; + + /* + * Call smb2_set_rsp_credits() function to set number of credits + * granted in hdr of smb2 response. + */ + if (conn->ops->set_rsp_credits) { + spin_lock(&conn->credits_lock); + rc = conn->ops->set_rsp_credits(work); + spin_unlock(&conn->credits_lock); + if (rc < 0) { + conn->ops->set_rsp_status(work, + STATUS_INVALID_PARAMETER); + goto send; + } + } + + if (work->sess && (work->sess->sign || + smb3_11_final_sess_setup_resp(work) || + conn->ops->is_sign_req(work, command))) + conn->ops->set_sign_rsp(work); + } while (is_chained_smb2_message(work)); + + if (work->send_no_response) + return; + +send: + smb3_preauth_hash_rsp(work); + if (work->sess && work->sess->enc && work->encrypted && + conn->ops->encrypt_resp) { + rc = conn->ops->encrypt_resp(work); + if (rc < 0) { + conn->ops->set_rsp_status(work, STATUS_DATA_ERROR); + goto send; + } + } + + ksmbd_conn_write(work); +} + +/** + * handle_ksmbd_work() - process pending smb work requests + * @ksmbd_work: smb work containing request command buffer + * + * called by kworker threads to processing remaining smb work requests + */ +static void handle_ksmbd_work(struct work_struct *wk) +{ + struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); + struct ksmbd_conn *conn = work->conn; + + atomic64_inc(&conn->stats.request_served); + + __handle_ksmbd_work(work, conn); + + ksmbd_conn_try_dequeue_request(work); + ksmbd_free_work_struct(work); + atomic_dec(&conn->r_count); +} + +/** + * queue_ksmbd_work() - queue a smb request to worker thread queue + * for proccessing smb command and sending response + * @conn: connection instance + * + * read remaining data from socket create and submit work. + */ +static int queue_ksmbd_work(struct ksmbd_conn *conn) +{ + struct ksmbd_work *work; + + work = ksmbd_alloc_work_struct(); + if (!work) { + ksmbd_err("allocation for work failed\n"); + return -ENOMEM; + } + + work->conn = conn; + work->request_buf = conn->request_buf; + conn->request_buf = NULL; + + if (ksmbd_init_smb_server(work)) { + ksmbd_free_work_struct(work); + return -EINVAL; + } + + ksmbd_conn_enqueue_request(work); + atomic_inc(&conn->r_count); + /* update activity on connection */ + conn->last_active = jiffies; + INIT_WORK(&work->work, handle_ksmbd_work); + ksmbd_queue_work(work); + return 0; +} + +static int ksmbd_server_process_request(struct ksmbd_conn *conn) +{ + return queue_ksmbd_work(conn); +} + +static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn) +{ + ksmbd_sessions_deregister(conn); + destroy_lease_table(conn); + return 0; +} + +static void ksmbd_server_tcp_callbacks_init(void) +{ + struct ksmbd_conn_ops ops; + + ops.process_fn = ksmbd_server_process_request; + ops.terminate_fn = ksmbd_server_terminate_conn; + + ksmbd_conn_init_server_callbacks(&ops); +} + +static void server_conf_free(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) { + kfree(server_conf.conf[i]); + server_conf.conf[i] = NULL; + } +} + +static int server_conf_init(void) +{ + WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP); + server_conf.enforced_signing = 0; + server_conf.min_protocol = ksmbd_min_protocol(); + server_conf.max_protocol = ksmbd_max_protocol(); + server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP; +#ifdef CONFIG_SMB_SERVER_KERBEROS5 + server_conf.auth_mechs |= KSMBD_AUTH_KRB5 | + KSMBD_AUTH_MSKRB5; +#endif + return 0; +} + +static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl) +{ + int ret; + + ret = ksmbd_conn_transport_init(); + if (ret) { + server_queue_ctrl_reset_work(); + return; + } + + WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING); +} + +static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl) +{ + ksmbd_ipc_soft_reset(); + ksmbd_conn_transport_destroy(); + server_conf_free(); + server_conf_init(); + WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP); +} + +static void server_ctrl_handle_work(struct work_struct *work) +{ + struct server_ctrl_struct *ctrl; + + ctrl = container_of(work, struct server_ctrl_struct, ctrl_work); + + mutex_lock(&ctrl_lock); + switch (ctrl->type) { + case SERVER_CTRL_TYPE_INIT: + server_ctrl_handle_init(ctrl); + break; + case SERVER_CTRL_TYPE_RESET: + server_ctrl_handle_reset(ctrl); + break; + default: + pr_err("Unknown server work type: %d\n", ctrl->type); + } + mutex_unlock(&ctrl_lock); + kfree(ctrl); + module_put(THIS_MODULE); +} + +static int __queue_ctrl_work(int type) +{ + struct server_ctrl_struct *ctrl; + + ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + + __module_get(THIS_MODULE); + ctrl->type = type; + INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work); + queue_work(system_long_wq, &ctrl->ctrl_work); + return 0; +} + +int server_queue_ctrl_init_work(void) +{ + return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT); +} + +int server_queue_ctrl_reset_work(void) +{ + return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET); +} + +static ssize_t stats_show(struct class *class, + struct class_attribute *attr, + char *buf) +{ + /* + * Inc this each time you change stats output format, + * so user space will know what to do. + */ + static int stats_version = 2; + static const char * const state[] = { + "startup", + "running", + "reset", + "shutdown" + }; + + ssize_t sz = scnprintf(buf, + PAGE_SIZE, + "%d %s %d %lu\n", + stats_version, + state[server_conf.state], + server_conf.tcp_port, + server_conf.ipc_last_active / HZ); + return sz; +} + +static ssize_t kill_server_store(struct class *class, + struct class_attribute *attr, + const char *buf, + size_t len) +{ + if (!sysfs_streq(buf, "hard")) + return len; + + ksmbd_info("kill command received\n"); + mutex_lock(&ctrl_lock); + WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING); + __module_get(THIS_MODULE); + server_ctrl_handle_reset(NULL); + module_put(THIS_MODULE); + mutex_unlock(&ctrl_lock); + return len; +} + +static const char * const debug_type_strings[] = {"smb", "auth", "vfs", + "oplock", "ipc", "conn", + "rdma"}; + +static ssize_t debug_show(struct class *class, + struct class_attribute *attr, + char *buf) +{ + ssize_t sz = 0; + int i, pos = 0; + + for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) { + if ((ksmbd_debug_types >> i) & 1) { + pos = scnprintf(buf + sz, + PAGE_SIZE - sz, + "[%s] ", + debug_type_strings[i]); + } else { + pos = scnprintf(buf + sz, + PAGE_SIZE - sz, + "%s ", + debug_type_strings[i]); + } + sz += pos; + + } + sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n"); + return sz; +} + +static ssize_t debug_store(struct class *class, + struct class_attribute *attr, + const char *buf, + size_t len) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) { + if (sysfs_streq(buf, "all")) { + if (ksmbd_debug_types == KSMBD_DEBUG_ALL) + ksmbd_debug_types = 0; + else + ksmbd_debug_types = KSMBD_DEBUG_ALL; + break; + } + + if (sysfs_streq(buf, debug_type_strings[i])) { + if (ksmbd_debug_types & (1 << i)) + ksmbd_debug_types &= ~(1 << i); + else + ksmbd_debug_types |= (1 << i); + break; + } + } + + return len; +} + +static CLASS_ATTR_RO(stats); +static CLASS_ATTR_WO(kill_server); +static CLASS_ATTR_RW(debug); + +static struct attribute *ksmbd_control_class_attrs[] = { + &class_attr_stats.attr, + &class_attr_kill_server.attr, + &class_attr_debug.attr, + NULL, +}; +ATTRIBUTE_GROUPS(ksmbd_control_class); + +static struct class ksmbd_control_class = { + .name = "ksmbd-control", + .owner = THIS_MODULE, + .class_groups = ksmbd_control_class_groups, +}; + +static int ksmbd_server_shutdown(void) +{ + WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN); + + class_unregister(&ksmbd_control_class); + ksmbd_workqueue_destroy(); + ksmbd_ipc_release(); + ksmbd_conn_transport_destroy(); + ksmbd_free_session_table(); + ksmbd_crypto_destroy(); + ksmbd_free_global_file_table(); + destroy_lease_table(NULL); + ksmbd_destroy_buffer_pools(); + server_conf_free(); + return 0; +} + +static int __init ksmbd_server_init(void) +{ + int ret; + + ret = class_register(&ksmbd_control_class); + if (ret) { + ksmbd_err("Unable to register ksmbd-control class\n"); + return ret; + } + + ksmbd_server_tcp_callbacks_init(); + + ret = server_conf_init(); + if (ret) + return ret; + + ret = ksmbd_init_buffer_pools(); + if (ret) + return ret; + + ret = ksmbd_init_session_table(); + if (ret) + goto error; + + ret = ksmbd_ipc_init(); + if (ret) + goto error; + + ret = ksmbd_init_global_file_table(); + if (ret) + goto error; + + ret = ksmbd_inode_hash_init(); + if (ret) + goto error; + + ret = ksmbd_crypto_create(); + if (ret) + goto error; + + ret = ksmbd_workqueue_init(); + if (ret) + goto error; + return 0; + +error: + ksmbd_server_shutdown(); + return ret; +} + +/** + * exit_smb_server() - shutdown forker thread and free memory at module exit + */ +static void __exit ksmbd_server_exit(void) +{ + ksmbd_server_shutdown(); + ksmbd_release_inode_hash(); +} + +MODULE_AUTHOR("Namjae Jeon linkinjeon@kernel.org"); +MODULE_VERSION(KSMBD_VERSION); +MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER"); +MODULE_LICENSE("GPL"); +MODULE_SOFTDEP("pre: arc4"); +MODULE_SOFTDEP("pre: ecb"); +MODULE_SOFTDEP("pre: hmac"); +MODULE_SOFTDEP("pre: md4"); +MODULE_SOFTDEP("pre: md5"); +MODULE_SOFTDEP("pre: nls"); +MODULE_SOFTDEP("pre: aes"); +MODULE_SOFTDEP("pre: cmac"); +MODULE_SOFTDEP("pre: sha256"); +MODULE_SOFTDEP("pre: sha512"); +MODULE_SOFTDEP("pre: aead2"); +MODULE_SOFTDEP("pre: ccm"); +MODULE_SOFTDEP("pre: gcm"); +module_init(ksmbd_server_init) +module_exit(ksmbd_server_exit) diff --git a/fs/cifsd/server.h b/fs/cifsd/server.h new file mode 100644 index 000000000000..7b2f6318fcff --- /dev/null +++ b/fs/cifsd/server.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __SERVER_H__ +#define __SERVER_H__ + +#include "smbacl.h" + +#define SERVER_STATE_STARTING_UP 0 +#define SERVER_STATE_RUNNING 1 +#define SERVER_STATE_RESETTING 2 +#define SERVER_STATE_SHUTTING_DOWN 3 + +#define SERVER_CONF_NETBIOS_NAME 0 +#define SERVER_CONF_SERVER_STRING 1 +#define SERVER_CONF_WORK_GROUP 2 + +extern int ksmbd_debugging; + +struct ksmbd_server_config { + unsigned int flags; + unsigned int state; + short signing; + short enforced_signing; + short min_protocol; + short max_protocol; + unsigned short tcp_port; + unsigned short ipc_timeout; + unsigned long ipc_last_active; + unsigned long deadtime; + unsigned int share_fake_fscaps; + struct smb_sid domain_sid; + unsigned int auth_mechs; + + char *conf[SERVER_CONF_WORK_GROUP + 1]; +}; + +extern struct ksmbd_server_config server_conf; + +int ksmbd_set_netbios_name(char *v); +int ksmbd_set_server_string(char *v); +int ksmbd_set_work_group(char *v); + +char *ksmbd_netbios_name(void); +char *ksmbd_server_string(void); +char *ksmbd_work_group(void); + +static inline int ksmbd_server_running(void) +{ + return READ_ONCE(server_conf.state) == SERVER_STATE_RUNNING; +} + +static inline int ksmbd_server_configurable(void) +{ + return READ_ONCE(server_conf.state) < SERVER_STATE_RESETTING; +} + +int server_queue_ctrl_init_work(void); +int server_queue_ctrl_reset_work(void); +#endif /* __SERVER_H__ */ diff --git a/fs/cifsd/transport_ipc.c b/fs/cifsd/transport_ipc.c new file mode 100644 index 000000000000..b91fa265f85d --- /dev/null +++ b/fs/cifsd/transport_ipc.c @@ -0,0 +1,900 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#include <linux/jhash.h> +#include <linux/slab.h> +#include <linux/rwsem.h> +#include <linux/mutex.h> +#include <linux/wait.h> +#include <linux/hashtable.h> +#include <net/net_namespace.h> +#include <net/genetlink.h> +#include <linux/socket.h> +#include <linux/workqueue.h> + +#include "vfs_cache.h" +#include "transport_ipc.h" +#include "buffer_pool.h" +#include "server.h" +#include "smb_common.h" + +#include "mgmt/user_config.h" +#include "mgmt/share_config.h" +#include "mgmt/user_session.h" +#include "mgmt/tree_connect.h" +#include "mgmt/ksmbd_ida.h" +#include "connection.h" +#include "transport_tcp.h" + +/* @FIXME fix this code */ +extern int get_protocol_idx(char *str); + +#define IPC_WAIT_TIMEOUT (2 * HZ) + +#define IPC_MSG_HASH_BITS 3 +static DEFINE_HASHTABLE(ipc_msg_table, IPC_MSG_HASH_BITS); +static DECLARE_RWSEM(ipc_msg_table_lock); +static DEFINE_MUTEX(startup_lock); + +static struct ksmbd_ida *ida; + +static unsigned int ksmbd_tools_pid; + +#define KSMBD_IPC_MSG_HANDLE(m) (*(unsigned int *)m) + +static bool ksmbd_ipc_validate_version(struct genl_info *m) +{ + if (m->genlhdr->version != KSMBD_GENL_VERSION) { + ksmbd_err("%s. ksmbd: %d, kernel module: %d. %s.\n", + "Daemon and kernel module version mismatch", + m->genlhdr->version, + KSMBD_GENL_VERSION, + "User-space ksmbd should terminate"); + return false; + } + return true; +} + +struct ksmbd_ipc_msg { + unsigned int type; + unsigned int sz; + unsigned char ____payload[0]; +}; + +#define KSMBD_IPC_MSG_PAYLOAD(m) \ + ((void *)(((struct ksmbd_ipc_msg *)(m))->____payload)) + +struct ipc_msg_table_entry { + unsigned int handle; + unsigned int type; + wait_queue_head_t wait; + struct hlist_node ipc_table_hlist; + + void *response; +}; + +static struct delayed_work ipc_timer_work; + +static int handle_startup_event(struct sk_buff *skb, struct genl_info *info); +static int handle_unsupported_event(struct sk_buff *skb, + struct genl_info *info); +static int handle_generic_event(struct sk_buff *skb, struct genl_info *info); +static int ksmbd_ipc_heartbeat_request(void); + +static const struct nla_policy ksmbd_nl_policy[KSMBD_EVENT_MAX] = { + [KSMBD_EVENT_UNSPEC] = { + .len = 0, + }, + [KSMBD_EVENT_HEARTBEAT_REQUEST] = { + .len = sizeof(struct ksmbd_heartbeat), + }, + [KSMBD_EVENT_STARTING_UP] = { + .len = sizeof(struct ksmbd_startup_request), + }, + [KSMBD_EVENT_SHUTTING_DOWN] = { + .len = sizeof(struct ksmbd_shutdown_request), + }, + [KSMBD_EVENT_LOGIN_REQUEST] = { + .len = sizeof(struct ksmbd_login_request), + }, + [KSMBD_EVENT_LOGIN_RESPONSE] = { + .len = sizeof(struct ksmbd_login_response), + }, + [KSMBD_EVENT_SHARE_CONFIG_REQUEST] = { + .len = sizeof(struct ksmbd_share_config_request), + }, + [KSMBD_EVENT_SHARE_CONFIG_RESPONSE] = { + .len = sizeof(struct ksmbd_share_config_response), + }, + [KSMBD_EVENT_TREE_CONNECT_REQUEST] = { + .len = sizeof(struct ksmbd_tree_connect_request), + }, + [KSMBD_EVENT_TREE_CONNECT_RESPONSE] = { + .len = sizeof(struct ksmbd_tree_connect_response), + }, + [KSMBD_EVENT_TREE_DISCONNECT_REQUEST] = { + .len = sizeof(struct ksmbd_tree_disconnect_request), + }, + [KSMBD_EVENT_LOGOUT_REQUEST] = { + .len = sizeof(struct ksmbd_logout_request), + }, + [KSMBD_EVENT_RPC_REQUEST] = { + }, + [KSMBD_EVENT_RPC_RESPONSE] = { + }, + [KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST] = { + }, + [KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE] = { + }, +}; + +static struct genl_ops ksmbd_genl_ops[] = { + { + .cmd = KSMBD_EVENT_UNSPEC, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_HEARTBEAT_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_STARTING_UP, + .doit = handle_startup_event, + }, + { + .cmd = KSMBD_EVENT_SHUTTING_DOWN, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_LOGIN_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_LOGIN_RESPONSE, + .doit = handle_generic_event, + }, + { + .cmd = KSMBD_EVENT_SHARE_CONFIG_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_SHARE_CONFIG_RESPONSE, + .doit = handle_generic_event, + }, + { + .cmd = KSMBD_EVENT_TREE_CONNECT_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_TREE_CONNECT_RESPONSE, + .doit = handle_generic_event, + }, + { + .cmd = KSMBD_EVENT_TREE_DISCONNECT_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_LOGOUT_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_RPC_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_RPC_RESPONSE, + .doit = handle_generic_event, + }, + { + .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST, + .doit = handle_unsupported_event, + }, + { + .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE, + .doit = handle_generic_event, + }, +}; + +static struct genl_family ksmbd_genl_family = { + .name = KSMBD_GENL_NAME, + .version = KSMBD_GENL_VERSION, + .hdrsize = 0, + .maxattr = KSMBD_EVENT_MAX, + .netnsok = true, + .module = THIS_MODULE, + .ops = ksmbd_genl_ops, + .n_ops = ARRAY_SIZE(ksmbd_genl_ops), +}; + +static void ksmbd_nl_init_fixup(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ksmbd_genl_ops); i++) + ksmbd_genl_ops[i].validate = GENL_DONT_VALIDATE_STRICT | + GENL_DONT_VALIDATE_DUMP; + + ksmbd_genl_family.policy = ksmbd_nl_policy; +} + +static int rpc_context_flags(struct ksmbd_session *sess) +{ + if (user_guest(sess->user)) + return KSMBD_RPC_RESTRICTED_CONTEXT; + return 0; +} + +static void ipc_update_last_active(void) +{ + if (server_conf.ipc_timeout) + server_conf.ipc_last_active = jiffies; +} + +static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz) +{ + struct ksmbd_ipc_msg *msg; + size_t msg_sz = sz + sizeof(struct ksmbd_ipc_msg); + + msg = ksmbd_alloc(msg_sz); + if (msg) + msg->sz = sz; + return msg; +} + +static void ipc_msg_free(struct ksmbd_ipc_msg *msg) +{ + ksmbd_free(msg); +} + +static void ipc_msg_handle_free(int handle) +{ + if (handle >= 0) + ksmbd_release_id(ida, handle); +} + +static int handle_response(int type, void *payload, size_t sz) +{ + int handle = KSMBD_IPC_MSG_HANDLE(payload); + struct ipc_msg_table_entry *entry; + int ret = 0; + + ipc_update_last_active(); + down_read(&ipc_msg_table_lock); + hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) { + if (handle != entry->handle) + continue; + + entry->response = NULL; + /* + * Response message type value should be equal to + * request message type + 1. + */ + if (entry->type + 1 != type) { + ksmbd_err("Waiting for IPC type %d, got %d. Ignore.\n", + entry->type + 1, type); + } + + entry->response = ksmbd_alloc(sz); + if (!entry->response) { + ret = -ENOMEM; + break; + } + + memcpy(entry->response, payload, sz); + wake_up_interruptible(&entry->wait); + ret = 0; + break; + } + up_read(&ipc_msg_table_lock); + + return ret; +} + +static int ipc_server_config_on_startup(struct ksmbd_startup_request *req) +{ + int ret; + + ksmbd_set_fd_limit(req->file_max); + server_conf.flags = req->flags; + server_conf.signing = req->signing; + server_conf.tcp_port = req->tcp_port; + server_conf.ipc_timeout = req->ipc_timeout * HZ; + server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL; + server_conf.share_fake_fscaps = req->share_fake_fscaps; + ksmbd_init_domain(req->sub_auth); + + if (req->smb2_max_read) + init_smb2_max_read_size(req->smb2_max_read); + if (req->smb2_max_write) + init_smb2_max_write_size(req->smb2_max_write); + if (req->smb2_max_trans) + init_smb2_max_trans_size(req->smb2_max_trans); + + ret = ksmbd_set_netbios_name(req->netbios_name); + ret |= ksmbd_set_server_string(req->server_string); + ret |= ksmbd_set_work_group(req->work_group); + ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req), + req->ifc_list_sz); + if (ret) { + ksmbd_err("Server configuration error: %s %s %s\n", + req->netbios_name, + req->server_string, + req->work_group); + return ret; + } + + if (req->min_prot[0]) { + ret = ksmbd_lookup_protocol_idx(req->min_prot); + if (ret >= 0) + server_conf.min_protocol = ret; + } + if (req->max_prot[0]) { + ret = ksmbd_lookup_protocol_idx(req->max_prot); + if (ret >= 0) + server_conf.max_protocol = ret; + } + + if (server_conf.ipc_timeout) + schedule_delayed_work(&ipc_timer_work, server_conf.ipc_timeout); + return 0; +} + +static int handle_startup_event(struct sk_buff *skb, struct genl_info *info) +{ + int ret = 0; + +#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; +#endif + + if (!ksmbd_ipc_validate_version(info)) + return -EINVAL; + + if (!info->attrs[KSMBD_EVENT_STARTING_UP]) + return -EINVAL; + + mutex_lock(&startup_lock); + if (!ksmbd_server_configurable()) { + mutex_unlock(&startup_lock); + ksmbd_err("Server reset is in progress, can't start daemon\n"); + return -EINVAL; + } + + if (ksmbd_tools_pid) { + if (ksmbd_ipc_heartbeat_request() == 0) { + ret = -EINVAL; + goto out; + } + + ksmbd_err("Reconnect to a new user space daemon\n"); + } else { + struct ksmbd_startup_request *req; + + req = nla_data(info->attrs[info->genlhdr->cmd]); + ret = ipc_server_config_on_startup(req); + if (ret) + goto out; + server_queue_ctrl_init_work(); + } + + ksmbd_tools_pid = info->snd_portid; + ipc_update_last_active(); + +out: + mutex_unlock(&startup_lock); + return ret; +} + +static int handle_unsupported_event(struct sk_buff *skb, + struct genl_info *info) +{ + ksmbd_err("Unknown IPC event: %d, ignore.\n", info->genlhdr->cmd); + return -EINVAL; +} + +static int handle_generic_event(struct sk_buff *skb, struct genl_info *info) +{ + void *payload; + int sz; + int type = info->genlhdr->cmd; + +#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; +#endif + + if (type >= KSMBD_EVENT_MAX) { + WARN_ON(1); + return -EINVAL; + } + + if (!ksmbd_ipc_validate_version(info)) + return -EINVAL; + + if (!info->attrs[type]) + return -EINVAL; + + payload = nla_data(info->attrs[info->genlhdr->cmd]); + sz = nla_len(info->attrs[info->genlhdr->cmd]); + return handle_response(type, payload, sz); +} + +static int ipc_msg_send(struct ksmbd_ipc_msg *msg) +{ + struct genlmsghdr *nlh; + struct sk_buff *skb; + int ret = -EINVAL; + + if (!ksmbd_tools_pid) + return ret; + + skb = genlmsg_new(msg->sz, GFP_KERNEL); + if (!skb) + return -ENOMEM; + + nlh = genlmsg_put(skb, 0, 0, &ksmbd_genl_family, 0, msg->type); + if (!nlh) + goto out; + + ret = nla_put(skb, msg->type, msg->sz, KSMBD_IPC_MSG_PAYLOAD(msg)); + if (ret) { + genlmsg_cancel(skb, nlh); + goto out; + } + + genlmsg_end(skb, nlh); + ret = genlmsg_unicast(&init_net, skb, ksmbd_tools_pid); + if (!ret) + ipc_update_last_active(); + return ret; + +out: + nlmsg_free(skb); + return ret; +} + +static void *ipc_msg_send_request(struct ksmbd_ipc_msg *msg, + unsigned int handle) +{ + struct ipc_msg_table_entry entry; + int ret; + + if ((int)handle < 0) + return NULL; + + entry.type = msg->type; + entry.response = NULL; + init_waitqueue_head(&entry.wait); + + down_write(&ipc_msg_table_lock); + entry.handle = handle; + hash_add(ipc_msg_table, &entry.ipc_table_hlist, entry.handle); + up_write(&ipc_msg_table_lock); + + ret = ipc_msg_send(msg); + if (ret) + goto out; + + ret = wait_event_interruptible_timeout(entry.wait, + entry.response != NULL, + IPC_WAIT_TIMEOUT); +out: + down_write(&ipc_msg_table_lock); + hash_del(&entry.ipc_table_hlist); + up_write(&ipc_msg_table_lock); + return entry.response; +} + +static int ksmbd_ipc_heartbeat_request(void) +{ + struct ksmbd_ipc_msg *msg; + int ret; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_heartbeat)); + if (!msg) + return -EINVAL; + + msg->type = KSMBD_EVENT_HEARTBEAT_REQUEST; + ret = ipc_msg_send(msg); + ipc_msg_free(msg); + return ret; +} + +struct ksmbd_login_response *ksmbd_ipc_login_request(const char *account) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_login_request *req; + struct ksmbd_login_response *resp; + + if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ) + return NULL; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_LOGIN_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = ksmbd_acquire_id(ida); + strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_handle_free(req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_spnego_authen_response * +ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_spnego_authen_request *req; + struct ksmbd_spnego_authen_response *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) + + blob_len + 1); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = ksmbd_acquire_id(ida); + req->spnego_blob_len = blob_len; + memcpy(req->spnego_blob, spnego_blob, blob_len); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_handle_free(req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_tree_connect_response * +ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess, + struct ksmbd_share_config *share, + struct ksmbd_tree_connect *tree_conn, + struct sockaddr *peer_addr) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_tree_connect_request *req; + struct ksmbd_tree_connect_response *resp; + + if (strlen(user_name(sess->user)) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ) + return NULL; + + if (strlen(share->name) >= KSMBD_REQ_MAX_SHARE_NAME) + return NULL; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_connect_request)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_TREE_CONNECT_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + + req->handle = ksmbd_acquire_id(ida); + req->account_flags = sess->user->flags; + req->session_id = sess->id; + req->connect_id = tree_conn->id; + strscpy(req->account, user_name(sess->user), KSMBD_REQ_MAX_ACCOUNT_NAME_SZ); + strscpy(req->share, share->name, KSMBD_REQ_MAX_SHARE_NAME); + snprintf(req->peer_addr, sizeof(req->peer_addr), "%pIS", peer_addr); + + if (peer_addr->sa_family == AF_INET6) + req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_IPV6; + if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2)) + req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_SMB2; + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_handle_free(req->handle); + ipc_msg_free(msg); + return resp; +} + +int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id, + unsigned long long connect_id) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_tree_disconnect_request *req; + int ret; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_disconnect_request)); + if (!msg) + return -ENOMEM; + + msg->type = KSMBD_EVENT_TREE_DISCONNECT_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->session_id = session_id; + req->connect_id = connect_id; + + ret = ipc_msg_send(msg); + ipc_msg_free(msg); + return ret; +} + +int ksmbd_ipc_logout_request(const char *account) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_logout_request *req; + int ret; + + if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ) + return -EINVAL; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_logout_request)); + if (!msg) + return -ENOMEM; + + msg->type = KSMBD_EVENT_LOGOUT_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ); + + ret = ipc_msg_send(msg); + ipc_msg_free(msg); + return ret; +} + +struct ksmbd_share_config_response * +ksmbd_ipc_share_config_request(const char *name) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_share_config_request *req; + struct ksmbd_share_config_response *resp; + + if (strlen(name) >= KSMBD_REQ_MAX_SHARE_NAME) + return NULL; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_share_config_request)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_SHARE_CONFIG_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = ksmbd_acquire_id(ida); + strscpy(req->share_name, name, KSMBD_REQ_MAX_SHARE_NAME); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_handle_free(req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess, + int handle) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = handle; + req->flags = ksmbd_session_rpc_method(sess, handle); + req->flags |= KSMBD_RPC_OPEN_METHOD; + req->payload_sz = 0; + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess, + int handle) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = handle; + req->flags = ksmbd_session_rpc_method(sess, handle); + req->flags |= KSMBD_RPC_CLOSE_METHOD; + req->payload_sz = 0; + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess, + int handle, + void *payload, + size_t payload_sz) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = handle; + req->flags = ksmbd_session_rpc_method(sess, handle); + req->flags |= rpc_context_flags(sess); + req->flags |= KSMBD_RPC_WRITE_METHOD; + req->payload_sz = payload_sz; + memcpy(req->payload, payload, payload_sz); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess, + int handle) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command)); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = handle; + req->flags = ksmbd_session_rpc_method(sess, handle); + req->flags |= rpc_context_flags(sess); + req->flags |= KSMBD_RPC_READ_METHOD; + req->payload_sz = 0; + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess, + int handle, + void *payload, + size_t payload_sz) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = handle; + req->flags = ksmbd_session_rpc_method(sess, handle); + req->flags |= rpc_context_flags(sess); + req->flags |= KSMBD_RPC_IOCTL_METHOD; + req->payload_sz = payload_sz; + memcpy(req->payload, payload, payload_sz); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_free(msg); + return resp; +} + +struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess, + void *payload, + size_t payload_sz) +{ + struct ksmbd_ipc_msg *msg; + struct ksmbd_rpc_command *req; + struct ksmbd_rpc_command *resp; + + msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + if (!msg) + return NULL; + + msg->type = KSMBD_EVENT_RPC_REQUEST; + req = KSMBD_IPC_MSG_PAYLOAD(msg); + req->handle = ksmbd_acquire_id(ida); + req->flags = rpc_context_flags(sess); + req->flags |= KSMBD_RPC_RAP_METHOD; + req->payload_sz = payload_sz; + memcpy(req->payload, payload, payload_sz); + + resp = ipc_msg_send_request(msg, req->handle); + ipc_msg_handle_free(req->handle); + ipc_msg_free(msg); + return resp; +} + +static int __ipc_heartbeat(void) +{ + unsigned long delta; + + if (!ksmbd_server_running()) + return 0; + + if (time_after(jiffies, server_conf.ipc_last_active)) { + delta = (jiffies - server_conf.ipc_last_active); + } else { + ipc_update_last_active(); + schedule_delayed_work(&ipc_timer_work, + server_conf.ipc_timeout); + return 0; + } + + if (delta < server_conf.ipc_timeout) { + schedule_delayed_work(&ipc_timer_work, + server_conf.ipc_timeout - delta); + return 0; + } + + if (ksmbd_ipc_heartbeat_request() == 0) { + schedule_delayed_work(&ipc_timer_work, + server_conf.ipc_timeout); + return 0; + } + + mutex_lock(&startup_lock); + WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING); + server_conf.ipc_last_active = 0; + ksmbd_tools_pid = 0; + ksmbd_err("No IPC daemon response for %lus\n", delta / HZ); + mutex_unlock(&startup_lock); + return -EINVAL; +} + +static void ipc_timer_heartbeat(struct work_struct *w) +{ + if (__ipc_heartbeat()) + server_queue_ctrl_reset_work(); +} + +int ksmbd_ipc_id_alloc(void) +{ + return ksmbd_acquire_id(ida); +} + +void ksmbd_rpc_id_free(int handle) +{ + ksmbd_release_id(ida, handle); +} + +void ksmbd_ipc_release(void) +{ + cancel_delayed_work_sync(&ipc_timer_work); + ksmbd_ida_free(ida); + genl_unregister_family(&ksmbd_genl_family); +} + +void ksmbd_ipc_soft_reset(void) +{ + mutex_lock(&startup_lock); + ksmbd_tools_pid = 0; + cancel_delayed_work_sync(&ipc_timer_work); + mutex_unlock(&startup_lock); +} + +int ksmbd_ipc_init(void) +{ + int ret; + + ksmbd_nl_init_fixup(); + INIT_DELAYED_WORK(&ipc_timer_work, ipc_timer_heartbeat); + + ret = genl_register_family(&ksmbd_genl_family); + if (ret) { + ksmbd_err("Failed to register KSMBD netlink interface %d\n", + ret); + return ret; + } + + ida = ksmbd_ida_alloc(); + if (!ida) + return -ENOMEM; + return 0; +} diff --git a/fs/cifsd/transport_ipc.h b/fs/cifsd/transport_ipc.h new file mode 100644 index 000000000000..68c003027811 --- /dev/null +++ b/fs/cifsd/transport_ipc.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_TRANSPORT_IPC_H__ +#define __KSMBD_TRANSPORT_IPC_H__ + +#include <linux/wait.h> +#include "ksmbd_server.h" /* FIXME */ + +#define KSMBD_IPC_MAX_PAYLOAD 4096 + +struct ksmbd_login_response * +ksmbd_ipc_login_request(const char *account); + +struct ksmbd_session; +struct ksmbd_share_config; +struct ksmbd_tree_connect; +struct sockaddr; + +struct ksmbd_tree_connect_response * +ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess, + struct ksmbd_share_config *share, + struct ksmbd_tree_connect *tree_conn, + struct sockaddr *peer_addr); + +int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id, + unsigned long long connect_id); +int ksmbd_ipc_logout_request(const char *account); + +struct ksmbd_share_config_response * +ksmbd_ipc_share_config_request(const char *name); + +struct ksmbd_spnego_authen_response * +ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len); + +int ksmbd_ipc_id_alloc(void); +void ksmbd_rpc_id_free(int handle); + +struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess, + int handle); +struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess, + int handle); + +struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess, + int handle, + void *payload, + size_t payload_sz); +struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess, + int handle); +struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess, + int handle, + void *payload, + size_t payload_sz); +struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess, + void *payload, + size_t payload_sz); + +void ksmbd_ipc_release(void); +void ksmbd_ipc_soft_reset(void); +int ksmbd_ipc_init(void); +#endif /* __KSMBD_TRANSPORT_IPC_H__ */ diff --git a/fs/cifsd/transport_rdma.c b/fs/cifsd/transport_rdma.c new file mode 100644 index 000000000000..1698f7ed9c2f --- /dev/null +++ b/fs/cifsd/transport_rdma.c @@ -0,0 +1,2050 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2017, Microsoft Corporation. + * Copyright (C) 2018, LG Electronics. + * + * Author(s): Long Li longli@microsoft.com, + * Hyunchul Lee hyc.lee@gmail.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + */ + +#define SUBMOD_NAME "smb_direct" + +#include <linux/kthread.h> +#include <linux/rwlock.h> +#include <linux/list.h> +#include <linux/mempool.h> +#include <linux/highmem.h> +#include <linux/scatterlist.h> +#include <rdma/ib_verbs.h> +#include <rdma/rdma_cm.h> +#include <rdma/rw.h> + +#include "glob.h" +#include "connection.h" +#include "smb_common.h" +#include "smbstatus.h" +#include "buffer_pool.h" +#include "transport_rdma.h" + +#define SMB_DIRECT_PORT 5445 + +#define SMB_DIRECT_VERSION_LE cpu_to_le16(0x0100) + +/* SMB_DIRECT negotiation timeout in seconds */ +#define SMB_DIRECT_NEGOTIATE_TIMEOUT 120 + +#define SMB_DIRECT_MAX_SEND_SGES 8 +#define SMB_DIRECT_MAX_RECV_SGES 1 + +/* + * Default maximum number of RDMA read/write outstanding on this connection + * This value is possibly decreased during QP creation on hardware limit + */ +#define SMB_DIRECT_CM_INITIATOR_DEPTH 8 + +/* Maximum number of retries on data transfer operations */ +#define SMB_DIRECT_CM_RETRY 6 +/* No need to retry on Receiver Not Ready since SMB_DIRECT manages credits */ +#define SMB_DIRECT_CM_RNR_RETRY 0 + +/* + * User configurable initial values per SMB_DIRECT transport connection + * as defined in [MS-KSMBD] 3.1.1.1 + * Those may change after a SMB_DIRECT negotiation + */ +/* The local peer's maximum number of credits to grant to the peer */ +static int smb_direct_receive_credit_max = 255; + +/* The remote peer's credit request of local peer */ +static int smb_direct_send_credit_target = 255; + +/* The maximum single message size can be sent to remote peer */ +static int smb_direct_max_send_size = 8192; + +/* The maximum fragmented upper-layer payload receive size supported */ +static int smb_direct_max_fragmented_recv_size = 1024 * 1024; + +/* The maximum single-message size which can be received */ +static int smb_direct_max_receive_size = 8192; + +static int smb_direct_max_read_write_size = 1024 * 1024; + +static int smb_direct_max_outstanding_rw_ops = 8; + +static struct smb_direct_listener { + struct rdma_cm_id *cm_id; +} smb_direct_listener; + + +static struct workqueue_struct *smb_direct_wq; + +enum smb_direct_status { + SMB_DIRECT_CS_NEW = 0, + SMB_DIRECT_CS_CONNECTED, + SMB_DIRECT_CS_DISCONNECTING, + SMB_DIRECT_CS_DISCONNECTED, +}; + +struct smb_direct_transport { + struct ksmbd_transport transport; + + enum smb_direct_status status; + bool full_packet_received; + wait_queue_head_t wait_status; + + struct rdma_cm_id *cm_id; + struct ib_cq *send_cq; + struct ib_cq *recv_cq; + struct ib_pd *pd; + struct ib_qp *qp; + + int max_send_size; + int max_recv_size; + int max_fragmented_send_size; + int max_fragmented_recv_size; + int max_rdma_rw_size; + + spinlock_t reassembly_queue_lock; + struct list_head reassembly_queue; + int reassembly_data_length; + int reassembly_queue_length; + int first_entry_offset; + wait_queue_head_t wait_reassembly_queue; + + spinlock_t receive_credit_lock; + int recv_credits; + int count_avail_recvmsg; + int recv_credit_max; + int recv_credit_target; + + spinlock_t recvmsg_queue_lock; + struct list_head recvmsg_queue; + + spinlock_t empty_recvmsg_queue_lock; + struct list_head empty_recvmsg_queue; + + int send_credit_target; + atomic_t send_credits; + spinlock_t lock_new_recv_credits; + int new_recv_credits; + atomic_t rw_avail_ops; + + wait_queue_head_t wait_send_credits; + wait_queue_head_t wait_rw_avail_ops; + + mempool_t *sendmsg_mempool; + struct kmem_cache *sendmsg_cache; + mempool_t *recvmsg_mempool; + struct kmem_cache *recvmsg_cache; + + wait_queue_head_t wait_send_payload_pending; + atomic_t send_payload_pending; + wait_queue_head_t wait_send_pending; + atomic_t send_pending; + + struct delayed_work post_recv_credits_work; + struct work_struct send_immediate_work; + struct work_struct disconnect_work; + + bool negotiation_requested; +}; + +#define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport)) +#define SMB_DIRECT_TRANS(t) ((struct smb_direct_transport *)container_of(t, \ + struct smb_direct_transport, transport)) + +enum { + SMB_DIRECT_MSG_NEGOTIATE_REQ = 0, + SMB_DIRECT_MSG_DATA_TRANSFER +}; + +static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops; + +struct smb_direct_send_ctx { + struct list_head msg_list; + int wr_cnt; + bool need_invalidate_rkey; + unsigned int remote_key; +}; + +struct smb_direct_sendmsg { + struct smb_direct_transport *transport; + struct ib_send_wr wr; + struct list_head list; + int num_sge; + struct ib_sge sge[SMB_DIRECT_MAX_SEND_SGES]; + struct ib_cqe cqe; + u8 packet[]; +}; + +struct smb_direct_recvmsg { + struct smb_direct_transport *transport; + struct list_head list; + int type; + struct ib_sge sge; + struct ib_cqe cqe; + bool first_segment; + u8 packet[]; +}; + +struct smb_direct_rdma_rw_msg { + struct smb_direct_transport *t; + struct ib_cqe cqe; + struct completion *completion; + struct rdma_rw_ctx rw_ctx; + struct sg_table sgt; + struct scatterlist sg_list[0]; +}; + +#define BUFFER_NR_PAGES(buf, len) \ + (DIV_ROUND_UP((unsigned long)(buf) + (len), PAGE_SIZE) \ + - (unsigned long)(buf) / PAGE_SIZE) + +static void smb_direct_destroy_pools(struct smb_direct_transport *transport); +static void smb_direct_post_recv_credits(struct work_struct *work); +static int smb_direct_post_send_data(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct kvec *iov, int niov, int remaining_data_length); + +static inline void +*smb_direct_recvmsg_payload(struct smb_direct_recvmsg *recvmsg) +{ + return (void *)recvmsg->packet; +} + +static inline bool is_receive_credit_post_required(int receive_credits, + int avail_recvmsg_count) +{ + return receive_credits <= (smb_direct_receive_credit_max >> 3) && + avail_recvmsg_count >= (receive_credits >> 2); +} + +static struct +smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg = NULL; + + spin_lock(&t->recvmsg_queue_lock); + if (!list_empty(&t->recvmsg_queue)) { + recvmsg = list_first_entry(&t->recvmsg_queue, + struct smb_direct_recvmsg, + list); + list_del(&recvmsg->list); + } + spin_unlock(&t->recvmsg_queue_lock); + return recvmsg; +} + +static void put_recvmsg(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + spin_lock(&t->recvmsg_queue_lock); + list_add(&recvmsg->list, &t->recvmsg_queue); + spin_unlock(&t->recvmsg_queue_lock); + +} + +static struct +smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg = NULL; + + spin_lock(&t->empty_recvmsg_queue_lock); + if (!list_empty(&t->empty_recvmsg_queue)) { + recvmsg = list_first_entry( + &t->empty_recvmsg_queue, + struct smb_direct_recvmsg, list); + list_del(&recvmsg->list); + } + spin_unlock(&t->empty_recvmsg_queue_lock); + return recvmsg; +} + +static void put_empty_recvmsg(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + spin_lock(&t->empty_recvmsg_queue_lock); + list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue); + spin_unlock(&t->empty_recvmsg_queue_lock); +} + +static void enqueue_reassembly(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg, + int data_length) +{ + spin_lock(&t->reassembly_queue_lock); + list_add_tail(&recvmsg->list, &t->reassembly_queue); + t->reassembly_queue_length++; + /* + * Make sure reassembly_data_length is updated after list and + * reassembly_queue_length are updated. On the dequeue side + * reassembly_data_length is checked without a lock to determine + * if reassembly_queue_length and list is up to date + */ + virt_wmb(); + t->reassembly_data_length += data_length; + spin_unlock(&t->reassembly_queue_lock); + +} + +static struct smb_direct_recvmsg *get_first_reassembly( + struct smb_direct_transport *t) +{ + if (!list_empty(&t->reassembly_queue)) + return list_first_entry(&t->reassembly_queue, + struct smb_direct_recvmsg, list); + else + return NULL; +} + +static void smb_direct_disconnect_rdma_work(struct work_struct *work) +{ + struct smb_direct_transport *t = + container_of(work, struct smb_direct_transport, + disconnect_work); + + if (t->status == SMB_DIRECT_CS_CONNECTED) { + t->status = SMB_DIRECT_CS_DISCONNECTING; + rdma_disconnect(t->cm_id); + } +} + +static void +smb_direct_disconnect_rdma_connection(struct smb_direct_transport *t) +{ + queue_work(smb_direct_wq, &t->disconnect_work); +} + +static void smb_direct_send_immediate_work(struct work_struct *work) +{ + struct smb_direct_transport *t = container_of(work, + struct smb_direct_transport, send_immediate_work); + + if (t->status != SMB_DIRECT_CS_CONNECTED) + return; + + smb_direct_post_send_data(t, NULL, NULL, 0, 0); +} + +static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id) +{ + struct smb_direct_transport *t; + struct ksmbd_conn *conn; + + t = kzalloc(sizeof(*t), GFP_KERNEL); + if (!t) + return NULL; + + t->cm_id = cm_id; + cm_id->context = t; + + t->status = SMB_DIRECT_CS_NEW; + init_waitqueue_head(&t->wait_status); + + spin_lock_init(&t->reassembly_queue_lock); + INIT_LIST_HEAD(&t->reassembly_queue); + t->reassembly_data_length = 0; + t->reassembly_queue_length = 0; + init_waitqueue_head(&t->wait_reassembly_queue); + init_waitqueue_head(&t->wait_send_credits); + init_waitqueue_head(&t->wait_rw_avail_ops); + + spin_lock_init(&t->receive_credit_lock); + spin_lock_init(&t->recvmsg_queue_lock); + INIT_LIST_HEAD(&t->recvmsg_queue); + + spin_lock_init(&t->empty_recvmsg_queue_lock); + INIT_LIST_HEAD(&t->empty_recvmsg_queue); + + init_waitqueue_head(&t->wait_send_payload_pending); + atomic_set(&t->send_payload_pending, 0); + init_waitqueue_head(&t->wait_send_pending); + atomic_set(&t->send_pending, 0); + + spin_lock_init(&t->lock_new_recv_credits); + + INIT_DELAYED_WORK(&t->post_recv_credits_work, + smb_direct_post_recv_credits); + INIT_WORK(&t->send_immediate_work, smb_direct_send_immediate_work); + INIT_WORK(&t->disconnect_work, smb_direct_disconnect_rdma_work); + + conn = ksmbd_conn_alloc(); + if (!conn) + goto err; + conn->transport = KSMBD_TRANS(t); + KSMBD_TRANS(t)->conn = conn; + KSMBD_TRANS(t)->ops = &ksmbd_smb_direct_transport_ops; + return t; +err: + kfree(t); + return NULL; +} + +static void free_transport(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg; + + wake_up_interruptible(&t->wait_send_credits); + + ksmbd_debug(RDMA, "wait for all send posted to IB to finish\n"); + wait_event(t->wait_send_payload_pending, + atomic_read(&t->send_payload_pending) == 0); + wait_event(t->wait_send_pending, + atomic_read(&t->send_pending) == 0); + + cancel_work_sync(&t->disconnect_work); + cancel_delayed_work_sync(&t->post_recv_credits_work); + cancel_work_sync(&t->send_immediate_work); + + if (t->qp) { + ib_drain_qp(t->qp); + ib_destroy_qp(t->qp); + } + + ksmbd_debug(RDMA, "drain the reassembly queue\n"); + do { + spin_lock(&t->reassembly_queue_lock); + recvmsg = get_first_reassembly(t); + if (recvmsg) { + list_del(&recvmsg->list); + spin_unlock( + &t->reassembly_queue_lock); + put_recvmsg(t, recvmsg); + } else + spin_unlock(&t->reassembly_queue_lock); + } while (recvmsg); + t->reassembly_data_length = 0; + + if (t->send_cq) + ib_free_cq(t->send_cq); + if (t->recv_cq) + ib_free_cq(t->recv_cq); + if (t->pd) + ib_dealloc_pd(t->pd); + if (t->cm_id) + rdma_destroy_id(t->cm_id); + + smb_direct_destroy_pools(t); + ksmbd_conn_free(KSMBD_TRANS(t)->conn); + kfree(t); +} + +static struct smb_direct_sendmsg +*smb_direct_alloc_sendmsg(struct smb_direct_transport *t) +{ + struct smb_direct_sendmsg *msg; + + msg = mempool_alloc(t->sendmsg_mempool, GFP_KERNEL); + if (!msg) + return ERR_PTR(-ENOMEM); + msg->transport = t; + INIT_LIST_HEAD(&msg->list); + msg->num_sge = 0; + return msg; +} + +static void smb_direct_free_sendmsg(struct smb_direct_transport *t, + struct smb_direct_sendmsg *msg) +{ + int i; + + if (msg->num_sge > 0) { + ib_dma_unmap_single(t->cm_id->device, + msg->sge[0].addr, msg->sge[0].length, + DMA_TO_DEVICE); + for (i = 1; i < msg->num_sge; i++) + ib_dma_unmap_page(t->cm_id->device, + msg->sge[i].addr, msg->sge[i].length, + DMA_TO_DEVICE); + } + mempool_free(msg, t->sendmsg_mempool); +} + +static int smb_direct_check_recvmsg(struct smb_direct_recvmsg *recvmsg) +{ + switch (recvmsg->type) { + case SMB_DIRECT_MSG_DATA_TRANSFER: { + struct smb_direct_data_transfer *req = + (struct smb_direct_data_transfer *) recvmsg->packet; + struct smb2_hdr *hdr = (struct smb2_hdr *) (recvmsg->packet + + le32_to_cpu(req->data_offset) - 4); + ksmbd_debug(RDMA, + "CreditGranted: %u, CreditRequested: %u, DataLength: %u, RemaingDataLength: %u, SMB: %x, Command: %u\n", + le16_to_cpu(req->credits_granted), + le16_to_cpu(req->credits_requested), + req->data_length, req->remaining_data_length, + hdr->ProtocolId, hdr->Command); + break; + } + case SMB_DIRECT_MSG_NEGOTIATE_REQ: { + struct smb_direct_negotiate_req *req = + (struct smb_direct_negotiate_req *)recvmsg->packet; + ksmbd_debug(RDMA, + "MinVersion: %u, MaxVersion: %u, CreditRequested: %u, MaxSendSize: %u, MaxRecvSize: %u, MaxFragmentedSize: %u\n", + le16_to_cpu(req->min_version), + le16_to_cpu(req->max_version), + le16_to_cpu(req->credits_requested), + le32_to_cpu(req->preferred_send_size), + le32_to_cpu(req->max_receive_size), + le32_to_cpu(req->max_fragmented_size)); + if (le16_to_cpu(req->min_version) > 0x0100 || + le16_to_cpu(req->max_version) < 0x0100) + return -EOPNOTSUPP; + if (le16_to_cpu(req->credits_requested) <= 0 || + le32_to_cpu(req->max_receive_size) <= 128 || + le32_to_cpu(req->max_fragmented_size) <= + 128*1024) + return -ECONNABORTED; + + break; + } + default: + return -EINVAL; + } + return 0; +} + +static void recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_transport *t; + + recvmsg = container_of(wc->wr_cqe, struct smb_direct_recvmsg, cqe); + t = recvmsg->transport; + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { + if (wc->status != IB_WC_WR_FLUSH_ERR) { + ksmbd_err("Recv error. status='%s (%d)' opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + smb_direct_disconnect_rdma_connection(t); + } + put_empty_recvmsg(t, recvmsg); + return; + } + + ksmbd_debug(RDMA, "Recv completed. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + + ib_dma_sync_single_for_cpu(wc->qp->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + switch (recvmsg->type) { + case SMB_DIRECT_MSG_NEGOTIATE_REQ: + t->negotiation_requested = true; + t->full_packet_received = true; + wake_up_interruptible(&t->wait_status); + break; + case SMB_DIRECT_MSG_DATA_TRANSFER: { + struct smb_direct_data_transfer *data_transfer = + (struct smb_direct_data_transfer *)recvmsg->packet; + int data_length = le32_to_cpu(data_transfer->data_length); + int avail_recvmsg_count, receive_credits; + + if (data_length) { + if (t->full_packet_received) + recvmsg->first_segment = true; + + if (le32_to_cpu(data_transfer->remaining_data_length)) + t->full_packet_received = false; + else + t->full_packet_received = true; + + enqueue_reassembly(t, recvmsg, data_length); + wake_up_interruptible(&t->wait_reassembly_queue); + + spin_lock(&t->receive_credit_lock); + receive_credits = --(t->recv_credits); + avail_recvmsg_count = t->count_avail_recvmsg; + spin_unlock(&t->receive_credit_lock); + } else { + put_empty_recvmsg(t, recvmsg); + + spin_lock(&t->receive_credit_lock); + receive_credits = --(t->recv_credits); + avail_recvmsg_count = ++(t->count_avail_recvmsg); + spin_unlock(&t->receive_credit_lock); + } + + t->recv_credit_target = + le16_to_cpu(data_transfer->credits_requested); + atomic_add(le16_to_cpu(data_transfer->credits_granted), + &t->send_credits); + + if (le16_to_cpu(data_transfer->flags) & + SMB_DIRECT_RESPONSE_REQUESTED) + queue_work(smb_direct_wq, &t->send_immediate_work); + + if (atomic_read(&t->send_credits) > 0) + wake_up_interruptible(&t->wait_send_credits); + + if (is_receive_credit_post_required(receive_credits, + avail_recvmsg_count)) + mod_delayed_work(smb_direct_wq, + &t->post_recv_credits_work, 0); + break; + } + default: + break; + } +} + +static int smb_direct_post_recv(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + struct ib_recv_wr wr; + int ret; + + recvmsg->sge.addr = ib_dma_map_single(t->cm_id->device, + recvmsg->packet, t->max_recv_size, + DMA_FROM_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, recvmsg->sge.addr); + if (ret) + return ret; + recvmsg->sge.length = t->max_recv_size; + recvmsg->sge.lkey = t->pd->local_dma_lkey; + recvmsg->cqe.done = recv_done; + + wr.wr_cqe = &recvmsg->cqe; + wr.next = NULL; + wr.sg_list = &recvmsg->sge; + wr.num_sge = 1; + + ret = ib_post_recv(t->qp, &wr, NULL); + if (ret) { + ksmbd_err("Can't post recv: %d\n", ret); + ib_dma_unmap_single(t->cm_id->device, + recvmsg->sge.addr, recvmsg->sge.length, + DMA_FROM_DEVICE); + smb_direct_disconnect_rdma_connection(t); + return ret; + } + return ret; +} + +static int smb_direct_read(struct ksmbd_transport *t, char *buf, + unsigned int size) +{ + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_data_transfer *data_transfer; + int to_copy, to_read, data_read, offset; + u32 data_length, remaining_data_length, data_offset; + int rc; + struct smb_direct_transport *st = SMB_DIRECT_TRANS(t); + +again: + if (st->status != SMB_DIRECT_CS_CONNECTED) { + ksmbd_err("disconnected\n"); + return -ENOTCONN; + } + + /* + * No need to hold the reassembly queue lock all the time as we are + * the only one reading from the front of the queue. The transport + * may add more entries to the back of the queue at the same time + */ + if (st->reassembly_data_length >= size) { + int queue_length; + int queue_removed = 0; + + /* + * Need to make sure reassembly_data_length is read before + * reading reassembly_queue_length and calling + * get_first_reassembly. This call is lock free + * as we never read at the end of the queue which are being + * updated in SOFTIRQ as more data is received + */ + virt_rmb(); + queue_length = st->reassembly_queue_length; + data_read = 0; + to_read = size; + offset = st->first_entry_offset; + while (data_read < size) { + recvmsg = get_first_reassembly(st); + data_transfer = smb_direct_recvmsg_payload(recvmsg); + data_length = le32_to_cpu(data_transfer->data_length); + remaining_data_length = + le32_to_cpu( + data_transfer->remaining_data_length); + data_offset = le32_to_cpu(data_transfer->data_offset); + + /* + * The upper layer expects RFC1002 length at the + * beginning of the payload. Return it to indicate + * the total length of the packet. This minimize the + * change to upper layer packet processing logic. This + * will be eventually remove when an intermediate + * transport layer is added + */ + if (recvmsg->first_segment && size == 4) { + unsigned int rfc1002_len = + data_length + remaining_data_length; + *((__be32 *)buf) = cpu_to_be32(rfc1002_len); + data_read = 4; + recvmsg->first_segment = false; + ksmbd_debug(RDMA, + "returning rfc1002 length %d\n", + rfc1002_len); + goto read_rfc1002_done; + } + + to_copy = min_t(int, data_length - offset, to_read); + memcpy( + buf + data_read, + (char *)data_transfer + data_offset + offset, + to_copy); + + /* move on to the next buffer? */ + if (to_copy == data_length - offset) { + queue_length--; + /* + * No need to lock if we are not at the + * end of the queue + */ + if (queue_length) + list_del(&recvmsg->list); + else { + spin_lock_irq( + &st->reassembly_queue_lock); + list_del(&recvmsg->list); + spin_unlock_irq( + &st->reassembly_queue_lock); + } + queue_removed++; + put_recvmsg(st, recvmsg); + offset = 0; + } else + offset += to_copy; + + to_read -= to_copy; + data_read += to_copy; + } + + spin_lock_irq(&st->reassembly_queue_lock); + st->reassembly_data_length -= data_read; + st->reassembly_queue_length -= queue_removed; + spin_unlock_irq(&st->reassembly_queue_lock); + + spin_lock(&st->receive_credit_lock); + st->count_avail_recvmsg += queue_removed; + if (is_receive_credit_post_required(st->recv_credits, + st->count_avail_recvmsg)) { + spin_unlock(&st->receive_credit_lock); + mod_delayed_work(smb_direct_wq, + &st->post_recv_credits_work, 0); + } else + spin_unlock(&st->receive_credit_lock); + + st->first_entry_offset = offset; + ksmbd_debug(RDMA, + "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n", + data_read, st->reassembly_data_length, + st->first_entry_offset); +read_rfc1002_done: + return data_read; + } + + ksmbd_debug(RDMA, "wait_event on more data\n"); + rc = wait_event_interruptible( + st->wait_reassembly_queue, + st->reassembly_data_length >= size || + st->status != SMB_DIRECT_CS_CONNECTED); + if (rc) + return -EINTR; + + goto again; +} + +static void smb_direct_post_recv_credits(struct work_struct *work) +{ + struct smb_direct_transport *t = container_of(work, + struct smb_direct_transport, post_recv_credits_work.work); + struct smb_direct_recvmsg *recvmsg; + int receive_credits, credits = 0; + int ret; + int use_free = 1; + + spin_lock(&t->receive_credit_lock); + receive_credits = t->recv_credits; + spin_unlock(&t->receive_credit_lock); + + if (receive_credits < t->recv_credit_target) { + while (true) { + if (use_free) + recvmsg = get_free_recvmsg(t); + else + recvmsg = get_empty_recvmsg(t); + if (!recvmsg) { + if (use_free) { + use_free = 0; + continue; + } else + break; + } + + recvmsg->type = SMB_DIRECT_MSG_DATA_TRANSFER; + recvmsg->first_segment = false; + + ret = smb_direct_post_recv(t, recvmsg); + if (ret) { + ksmbd_err("Can't post recv: %d\n", ret); + put_recvmsg(t, recvmsg); + break; + } + credits++; + } + } + + spin_lock(&t->receive_credit_lock); + t->recv_credits += credits; + t->count_avail_recvmsg -= credits; + spin_unlock(&t->receive_credit_lock); + + spin_lock(&t->lock_new_recv_credits); + t->new_recv_credits += credits; + spin_unlock(&t->lock_new_recv_credits); + + if (credits) + queue_work(smb_direct_wq, &t->send_immediate_work); +} + +static void send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct smb_direct_sendmsg *sendmsg, *sibling; + struct smb_direct_transport *t; + struct list_head *pos, *prev, *end; + + sendmsg = container_of(wc->wr_cqe, struct smb_direct_sendmsg, cqe); + t = sendmsg->transport; + + ksmbd_debug(RDMA, "Send completed. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { + ksmbd_err("Send error. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + smb_direct_disconnect_rdma_connection(t); + } + + if (sendmsg->num_sge > 1) { + if (atomic_dec_and_test(&t->send_payload_pending)) + wake_up(&t->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&t->send_pending)) + wake_up(&t->wait_send_pending); + } + + /* iterate and free the list of messages in reverse. the list's head + * is invalid. + */ + for (pos = &sendmsg->list, prev = pos->prev, end = sendmsg->list.next; + prev != end; pos = prev, prev = prev->prev) { + sibling = container_of(pos, struct smb_direct_sendmsg, list); + smb_direct_free_sendmsg(t, sibling); + } + + sibling = container_of(pos, struct smb_direct_sendmsg, list); + smb_direct_free_sendmsg(t, sibling); +} + +static int manage_credits_prior_sending(struct smb_direct_transport *t) +{ + int new_credits; + + spin_lock(&t->lock_new_recv_credits); + new_credits = t->new_recv_credits; + t->new_recv_credits = 0; + spin_unlock(&t->lock_new_recv_credits); + + return new_credits; +} + +static int smb_direct_post_send(struct smb_direct_transport *t, + struct ib_send_wr *wr) +{ + int ret; + + if (wr->num_sge > 1) + atomic_inc(&t->send_payload_pending); + else + atomic_inc(&t->send_pending); + + ret = ib_post_send(t->qp, wr, NULL); + if (ret) { + ksmbd_err("failed to post send: %d\n", ret); + if (wr->num_sge > 1) { + if (atomic_dec_and_test(&t->send_payload_pending)) + wake_up(&t->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&t->send_pending)) + wake_up(&t->wait_send_pending); + } + smb_direct_disconnect_rdma_connection(t); + } + return ret; +} + +static void smb_direct_send_ctx_init(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + bool need_invalidate_rkey, unsigned int remote_key) +{ + INIT_LIST_HEAD(&send_ctx->msg_list); + send_ctx->wr_cnt = 0; + send_ctx->need_invalidate_rkey = need_invalidate_rkey; + send_ctx->remote_key = remote_key; +} + +static int smb_direct_flush_send_list(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, bool is_last) +{ + struct smb_direct_sendmsg *first, *last; + int ret; + + if (list_empty(&send_ctx->msg_list)) + return 0; + + first = list_first_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + last = list_last_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + + last->wr.send_flags = IB_SEND_SIGNALED; + last->wr.wr_cqe = &last->cqe; + if (is_last && send_ctx->need_invalidate_rkey) { + last->wr.opcode = IB_WR_SEND_WITH_INV; + last->wr.ex.invalidate_rkey = send_ctx->remote_key; + } + + ret = smb_direct_post_send(t, &first->wr); + if (!ret) { + smb_direct_send_ctx_init(t, send_ctx, + send_ctx->need_invalidate_rkey, send_ctx->remote_key); + } else { + atomic_add(send_ctx->wr_cnt, &t->send_credits); + wake_up(&t->wait_send_credits); + list_for_each_entry_safe(first, last, &send_ctx->msg_list, + list) { + smb_direct_free_sendmsg(t, first); + } + } + return ret; +} + +static int wait_for_credits(struct smb_direct_transport *t, + wait_queue_head_t *waitq, atomic_t *credits) +{ + int ret; + + do { + if (atomic_dec_return(credits) >= 0) + return 0; + + atomic_inc(credits); + ret = wait_event_interruptible(*waitq, + atomic_read(credits) > 0 || + t->status != SMB_DIRECT_CS_CONNECTED); + + if (t->status != SMB_DIRECT_CS_CONNECTED) + return -ENOTCONN; + else if (ret < 0) + return ret; + } while (true); +} + +static int wait_for_send_credits(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx) +{ + int ret; + + if (send_ctx && (send_ctx->wr_cnt >= 16 || + atomic_read(&t->send_credits) <= 1)) { + ret = smb_direct_flush_send_list(t, send_ctx, false); + if (ret) + return ret; + } + + return wait_for_credits(t, &t->wait_send_credits, &t->send_credits); +} + +static int smb_direct_create_header(struct smb_direct_transport *t, + int size, int remaining_data_length, + struct smb_direct_sendmsg **sendmsg_out) +{ + struct smb_direct_sendmsg *sendmsg; + struct smb_direct_data_transfer *packet; + int header_length; + int ret; + + sendmsg = smb_direct_alloc_sendmsg(t); + if (!sendmsg) + return -ENOMEM; + + /* Fill in the packet header */ + packet = (struct smb_direct_data_transfer *)sendmsg->packet; + packet->credits_requested = cpu_to_le16(t->send_credit_target); + packet->credits_granted = cpu_to_le16(manage_credits_prior_sending(t)); + + packet->flags = 0; + packet->reserved = 0; + if (!size) + packet->data_offset = 0; + else + packet->data_offset = cpu_to_le32(24); + packet->data_length = cpu_to_le32(size); + packet->remaining_data_length = cpu_to_le32(remaining_data_length); + packet->padding = 0; + + ksmbd_debug(RDMA, + "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n", + le16_to_cpu(packet->credits_requested), + le16_to_cpu(packet->credits_granted), + le32_to_cpu(packet->data_offset), + le32_to_cpu(packet->data_length), + le32_to_cpu(packet->remaining_data_length)); + + /* Map the packet to DMA */ + header_length = sizeof(struct smb_direct_data_transfer); + /* If this is a packet without payload, don't send padding */ + if (!size) + header_length = + offsetof(struct smb_direct_data_transfer, padding); + + sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, + (void *)packet, + header_length, + DMA_TO_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + sendmsg->num_sge = 1; + sendmsg->sge[0].length = header_length; + sendmsg->sge[0].lkey = t->pd->local_dma_lkey; + + *sendmsg_out = sendmsg; + return 0; +} + +static int get_sg_list(void *buf, int size, + struct scatterlist *sg_list, int nentries) +{ + bool high = is_vmalloc_addr(buf); + struct page *page; + int offset, len; + int i = 0; + + if (nentries < BUFFER_NR_PAGES(buf, size)) + return -EINVAL; + + offset = offset_in_page(buf); + buf -= offset; + while (size > 0) { + len = min_t(int, PAGE_SIZE - offset, size); + if (high) + page = vmalloc_to_page(buf); + else + page = kmap_to_page(buf); + + if (!sg_list) + return -EINVAL; + sg_set_page(sg_list, page, len, offset); + sg_list = sg_next(sg_list); + + buf += PAGE_SIZE; + size -= len; + offset = 0; + i++; + } + return i; +} + +static int get_mapped_sg_list(struct ib_device *device, void *buf, int size, + struct scatterlist *sg_list, int nentries, + enum dma_data_direction dir) +{ + int npages; + + npages = get_sg_list(buf, size, sg_list, nentries); + if (npages <= 0) + return -EINVAL; + return ib_dma_map_sg(device, sg_list, npages, dir); +} + +static int post_sendmsg(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct smb_direct_sendmsg *msg) +{ + int i; + + for (i = 0; i < msg->num_sge; i++) + ib_dma_sync_single_for_device(t->cm_id->device, + msg->sge[i].addr, msg->sge[i].length, + DMA_TO_DEVICE); + + msg->cqe.done = send_done; + msg->wr.opcode = IB_WR_SEND; + msg->wr.sg_list = &msg->sge[0]; + msg->wr.num_sge = msg->num_sge; + msg->wr.next = NULL; + + if (send_ctx) { + msg->wr.wr_cqe = NULL; + msg->wr.send_flags = 0; + if (!list_empty(&send_ctx->msg_list)) { + struct smb_direct_sendmsg *last; + + last = list_last_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + last->wr.next = &msg->wr; + } + list_add_tail(&msg->list, &send_ctx->msg_list); + send_ctx->wr_cnt++; + return 0; + } + + msg->wr.wr_cqe = &msg->cqe; + msg->wr.send_flags = IB_SEND_SIGNALED; + return smb_direct_post_send(t, &msg->wr); +} + +static int smb_direct_post_send_data(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct kvec *iov, int niov, int remaining_data_length) +{ + int i, j, ret; + struct smb_direct_sendmsg *msg; + int data_length; + struct scatterlist sg[SMB_DIRECT_MAX_SEND_SGES-1]; + + ret = wait_for_send_credits(t, send_ctx); + if (ret) + return ret; + + data_length = 0; + for (i = 0; i < niov; i++) + data_length += iov[i].iov_len; + + ret = smb_direct_create_header(t, data_length, remaining_data_length, + &msg); + if (ret) { + atomic_inc(&t->send_credits); + return ret; + } + + for (i = 0; i < niov; i++) { + struct ib_sge *sge; + int sg_cnt; + + sg_init_table(sg, SMB_DIRECT_MAX_SEND_SGES-1); + sg_cnt = get_mapped_sg_list(t->cm_id->device, + iov[i].iov_base, iov[i].iov_len, + sg, SMB_DIRECT_MAX_SEND_SGES-1, DMA_TO_DEVICE); + if (sg_cnt <= 0) { + ksmbd_err("failed to map buffer\n"); + goto err; + } else if (sg_cnt + msg->num_sge > SMB_DIRECT_MAX_SEND_SGES-1) { + ksmbd_err("buffer not fitted into sges\n"); + ret = -E2BIG; + ib_dma_unmap_sg(t->cm_id->device, sg, sg_cnt, + DMA_TO_DEVICE); + goto err; + } + + for (j = 0; j < sg_cnt; j++) { + sge = &msg->sge[msg->num_sge]; + sge->addr = sg_dma_address(&sg[j]); + sge->length = sg_dma_len(&sg[j]); + sge->lkey = t->pd->local_dma_lkey; + msg->num_sge++; + } + } + + ret = post_sendmsg(t, send_ctx, msg); + if (ret) + goto err; + return 0; +err: + smb_direct_free_sendmsg(t, msg); + atomic_inc(&t->send_credits); + return ret; +} + +static int smb_direct_writev(struct ksmbd_transport *t, + struct kvec *iov, int niovs, int buflen, + bool need_invalidate, unsigned int remote_key) +{ + struct smb_direct_transport *st = SMB_DIRECT_TRANS(t); + int remaining_data_length; + int start, i, j; + int max_iov_size = st->max_send_size - + sizeof(struct smb_direct_data_transfer); + int ret; + struct kvec vec; + struct smb_direct_send_ctx send_ctx; + + if (st->status != SMB_DIRECT_CS_CONNECTED) { + ret = -ENOTCONN; + goto done; + } + + //FIXME: skip RFC1002 header.. + buflen -= 4; + iov[0].iov_base += 4; + iov[0].iov_len -= 4; + + remaining_data_length = buflen; + ksmbd_debug(RDMA, "Sending smb (RDMA): smb_len=%u\n", buflen); + + smb_direct_send_ctx_init(st, &send_ctx, need_invalidate, remote_key); + start = i = 0; + buflen = 0; + while (true) { + buflen += iov[i].iov_len; + if (buflen > max_iov_size) { + if (i > start) { + remaining_data_length -= + (buflen-iov[i].iov_len); + ret = smb_direct_post_send_data(st, &send_ctx, + &iov[start], i-start, + remaining_data_length); + if (ret) + goto done; + } else { + /* iov[start] is too big, break it */ + int nvec = (buflen+max_iov_size-1) / + max_iov_size; + + for (j = 0; j < nvec; j++) { + vec.iov_base = + (char *)iov[start].iov_base + + j*max_iov_size; + vec.iov_len = + min_t(int, max_iov_size, + buflen - max_iov_size*j); + remaining_data_length -= vec.iov_len; + ret = smb_direct_post_send_data(st, + &send_ctx, &vec, 1, + remaining_data_length); + if (ret) + goto done; + } + i++; + if (i == niovs) + break; + } + start = i; + buflen = 0; + } else { + i++; + if (i == niovs) { + /* send out all remaining vecs */ + remaining_data_length -= buflen; + ret = smb_direct_post_send_data(st, &send_ctx, + &iov[start], i-start, + remaining_data_length); + if (ret) + goto done; + break; + } + } + } + +done: + ret = smb_direct_flush_send_list(st, &send_ctx, true); + + /* + * As an optimization, we don't wait for individual I/O to finish + * before sending the next one. + * Send them all and wait for pending send count to get to 0 + * that means all the I/Os have been out and we are good to return + */ + + wait_event(st->wait_send_payload_pending, + atomic_read(&st->send_payload_pending) == 0); + return ret; +} + +static void read_write_done(struct ib_cq *cq, struct ib_wc *wc, + enum dma_data_direction dir) +{ + struct smb_direct_rdma_rw_msg *msg = container_of(wc->wr_cqe, + struct smb_direct_rdma_rw_msg, cqe); + struct smb_direct_transport *t = msg->t; + + if (wc->status != IB_WC_SUCCESS) { + ksmbd_err("read/write error. opcode = %d, status = %s(%d)\n", + wc->opcode, ib_wc_status_msg(wc->status), wc->status); + smb_direct_disconnect_rdma_connection(t); + } + + if (atomic_inc_return(&t->rw_avail_ops) > 0) + wake_up(&t->wait_rw_avail_ops); + + rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, msg->sgt.nents, dir); + sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); + complete(msg->completion); + kfree(msg); +} + +static void read_done(struct ib_cq *cq, struct ib_wc *wc) +{ + read_write_done(cq, wc, DMA_FROM_DEVICE); +} + +static void write_done(struct ib_cq *cq, struct ib_wc *wc) +{ + read_write_done(cq, wc, DMA_TO_DEVICE); +} + +static int smb_direct_rdma_xmit(struct smb_direct_transport *t, void *buf, + int buf_len, u32 remote_key, u64 remote_offset, u32 remote_len, + bool is_read) +{ + struct smb_direct_rdma_rw_msg *msg; + int ret; + DECLARE_COMPLETION_ONSTACK(completion); + struct ib_send_wr *first_wr = NULL; + + ret = wait_for_credits(t, &t->wait_rw_avail_ops, &t->rw_avail_ops); + if (ret < 0) + return ret; + + /* TODO: mempool */ + msg = kmalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) + + sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL); + if (!msg) { + atomic_inc(&t->rw_avail_ops); + return -ENOMEM; + } + + msg->sgt.sgl = &msg->sg_list[0]; + ret = sg_alloc_table_chained(&msg->sgt, + BUFFER_NR_PAGES(buf, buf_len), + msg->sg_list, SG_CHUNK_SIZE); + if (ret) { + atomic_inc(&t->rw_avail_ops); + kfree(msg); + return -ENOMEM; + } + + ret = get_sg_list(buf, buf_len, msg->sgt.sgl, msg->sgt.orig_nents); + if (ret <= 0) { + ksmbd_err("failed to get pages\n"); + goto err; + } + + ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, BUFFER_NR_PAGES(buf, buf_len), + 0, remote_offset, remote_key, + is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); + if (ret < 0) { + ksmbd_err("failed to init rdma_rw_ctx: %d\n", ret); + goto err; + } + + msg->t = t; + msg->cqe.done = is_read ? read_done : write_done; + msg->completion = &completion; + first_wr = rdma_rw_ctx_wrs(&msg->rw_ctx, t->qp, t->qp->port, + &msg->cqe, NULL); + + ret = ib_post_send(t->qp, first_wr, NULL); + if (ret) { + ksmbd_err("failed to post send wr: %d\n", ret); + goto err; + } + + wait_for_completion(&completion); + return 0; + +err: + atomic_inc(&t->rw_avail_ops); + if (first_wr) + rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, msg->sgt.nents, + is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); + sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); + kfree(msg); + return ret; + +} + +static int smb_direct_rdma_write(struct ksmbd_transport *t, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len) +{ + return smb_direct_rdma_xmit(SMB_DIRECT_TRANS(t), buf, buflen, + remote_key, remote_offset, + remote_len, false); +} + +static int smb_direct_rdma_read(struct ksmbd_transport *t, + void *buf, unsigned int buflen, + u32 remote_key, u64 remote_offset, + u32 remote_len) +{ + return smb_direct_rdma_xmit(SMB_DIRECT_TRANS(t), buf, buflen, + remote_key, remote_offset, + remote_len, true); +} + +static void smb_direct_disconnect(struct ksmbd_transport *t) +{ + struct smb_direct_transport *st = SMB_DIRECT_TRANS(t); + + ksmbd_debug(RDMA, "Disconnecting cm_id=%p\n", st->cm_id); + + smb_direct_disconnect_rdma_connection(st); + wait_event_interruptible(st->wait_status, + st->status == SMB_DIRECT_CS_DISCONNECTED); + free_transport(st); +} + +static int smb_direct_cm_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct smb_direct_transport *t = cm_id->context; + + ksmbd_debug(RDMA, "RDMA CM event. cm_id=%p event=%s (%d)\n", + cm_id, rdma_event_msg(event->event), event->event); + + switch (event->event) { + case RDMA_CM_EVENT_ESTABLISHED: { + t->status = SMB_DIRECT_CS_CONNECTED; + wake_up_interruptible(&t->wait_status); + break; + } + case RDMA_CM_EVENT_DEVICE_REMOVAL: + case RDMA_CM_EVENT_DISCONNECTED: { + t->status = SMB_DIRECT_CS_DISCONNECTED; + wake_up_interruptible(&t->wait_status); + wake_up_interruptible(&t->wait_reassembly_queue); + wake_up(&t->wait_send_credits); + break; + } + case RDMA_CM_EVENT_CONNECT_ERROR: { + t->status = SMB_DIRECT_CS_DISCONNECTED; + wake_up_interruptible(&t->wait_status); + break; + } + default: + ksmbd_err("Unexpected RDMA CM event. cm_id=%p, event=%s (%d)\n", + cm_id, rdma_event_msg(event->event), + event->event); + break; + } + return 0; +} + +static void smb_direct_qpair_handler(struct ib_event *event, void *context) +{ + struct smb_direct_transport *t = context; + + ksmbd_debug(RDMA, "Received QP event. cm_id=%p, event=%s (%d)\n", + t->cm_id, ib_event_msg(event->event), event->event); + + switch (event->event) { + case IB_EVENT_CQ_ERR: + case IB_EVENT_QP_FATAL: + smb_direct_disconnect_rdma_connection(t); + break; + default: + break; + } +} + +static int smb_direct_send_negotiate_response(struct smb_direct_transport *t, + int failed) +{ + struct smb_direct_sendmsg *sendmsg; + struct smb_direct_negotiate_resp *resp; + int ret; + + sendmsg = smb_direct_alloc_sendmsg(t); + if (IS_ERR(sendmsg)) + return -ENOMEM; + + resp = (struct smb_direct_negotiate_resp *)sendmsg->packet; + if (failed) { + memset(resp, 0, sizeof(*resp)); + resp->min_version = cpu_to_le16(0x0100); + resp->max_version = cpu_to_le16(0x0100); + resp->status = STATUS_NOT_SUPPORTED; + } else { + resp->status = STATUS_SUCCESS; + resp->min_version = SMB_DIRECT_VERSION_LE; + resp->max_version = SMB_DIRECT_VERSION_LE; + resp->negotiated_version = SMB_DIRECT_VERSION_LE; + resp->reserved = 0; + resp->credits_requested = + cpu_to_le16(t->send_credit_target); + resp->credits_granted = cpu_to_le16( + manage_credits_prior_sending(t)); + resp->max_readwrite_size = cpu_to_le32(t->max_rdma_rw_size); + resp->preferred_send_size = cpu_to_le32(t->max_send_size); + resp->max_receive_size = cpu_to_le32(t->max_recv_size); + resp->max_fragmented_size = + cpu_to_le32(t->max_fragmented_recv_size); + } + + sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, + (void *)resp, sizeof(*resp), DMA_TO_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, + sendmsg->sge[0].addr); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + sendmsg->num_sge = 1; + sendmsg->sge[0].length = sizeof(*resp); + sendmsg->sge[0].lkey = t->pd->local_dma_lkey; + + ret = post_sendmsg(t, NULL, sendmsg); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + wait_event(t->wait_send_pending, + atomic_read(&t->send_pending) == 0); + return 0; +} + +static int smb_direct_accept_client(struct smb_direct_transport *t) +{ + struct rdma_conn_param conn_param; + struct ib_port_immutable port_immutable; + u32 ird_ord_hdr[2]; + int ret; + + memset(&conn_param, 0, sizeof(conn_param)); + conn_param.initiator_depth = min_t(u8, + t->cm_id->device->attrs.max_qp_rd_atom, + SMB_DIRECT_CM_INITIATOR_DEPTH); + conn_param.responder_resources = 0; + + t->cm_id->device->ops.get_port_immutable(t->cm_id->device, + t->cm_id->port_num, &port_immutable); + if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { + ird_ord_hdr[0] = conn_param.responder_resources; + ird_ord_hdr[1] = 1; + conn_param.private_data = ird_ord_hdr; + conn_param.private_data_len = sizeof(ird_ord_hdr); + } else { + conn_param.private_data = NULL; + conn_param.private_data_len = 0; + } + conn_param.retry_count = SMB_DIRECT_CM_RETRY; + conn_param.rnr_retry_count = SMB_DIRECT_CM_RNR_RETRY; + conn_param.flow_control = 0; + + ret = rdma_accept(t->cm_id, &conn_param); + if (ret) { + ksmbd_err("error at rdma_accept: %d\n", ret); + return ret; + } + + wait_event_interruptible(t->wait_status, + t->status != SMB_DIRECT_CS_NEW); + if (t->status != SMB_DIRECT_CS_CONNECTED) + return -ENOTCONN; + return 0; +} + +static int smb_direct_negotiate(struct smb_direct_transport *t) +{ + int ret; + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_negotiate_req *req; + + recvmsg = get_free_recvmsg(t); + if (!recvmsg) + return -ENOMEM; + recvmsg->type = SMB_DIRECT_MSG_NEGOTIATE_REQ; + + ret = smb_direct_post_recv(t, recvmsg); + if (ret) { + ksmbd_err("Can't post recv: %d\n", ret); + goto out; + } + + t->negotiation_requested = false; + ret = smb_direct_accept_client(t); + if (ret) { + ksmbd_err("Can't accept client\n"); + goto out; + } + + smb_direct_post_recv_credits(&t->post_recv_credits_work.work); + + ksmbd_debug(RDMA, "Waiting for SMB_DIRECT negotiate request\n"); + ret = wait_event_interruptible_timeout(t->wait_status, + t->negotiation_requested || + t->status == SMB_DIRECT_CS_DISCONNECTED, + SMB_DIRECT_NEGOTIATE_TIMEOUT * HZ); + if (ret <= 0 || t->status == SMB_DIRECT_CS_DISCONNECTED) { + ret = ret < 0 ? ret : -ETIMEDOUT; + goto out; + } + + ret = smb_direct_check_recvmsg(recvmsg); + if (ret == -ECONNABORTED) + goto out; + + req = (struct smb_direct_negotiate_req *)recvmsg->packet; + t->max_recv_size = min_t(int, t->max_recv_size, + le32_to_cpu(req->preferred_send_size)); + t->max_send_size = min_t(int, t->max_send_size, + le32_to_cpu(req->max_receive_size)); + t->max_fragmented_send_size = + le32_to_cpu(req->max_fragmented_size); + + ret = smb_direct_send_negotiate_response(t, ret); +out: + if (recvmsg) + put_recvmsg(t, recvmsg); + return ret; +} + +static int smb_direct_init_params(struct smb_direct_transport *t, + struct ib_qp_cap *cap) +{ + struct ib_device *device = t->cm_id->device; + int max_send_sges, max_pages, max_rw_wrs, max_send_wrs; + + /* need 2 more sge. because a SMB_DIRECT header will be mapped, + * and maybe a send buffer could be not page aligned. + */ + t->max_send_size = smb_direct_max_send_size; + max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 2; + if (max_send_sges > SMB_DIRECT_MAX_SEND_SGES) { + ksmbd_err("max_send_size %d is too large\n", t->max_send_size); + return -EINVAL; + } + + /* + * allow smb_direct_max_outstanding_rw_ops of in-flight RDMA + * read/writes. HCA guarantees at least max_send_sge of sges for + * a RDMA read/write work request, and if memory registration is used, + * we need reg_mr, local_inv wrs for each read/write. + */ + t->max_rdma_rw_size = smb_direct_max_read_write_size; + max_pages = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1; + max_rw_wrs = DIV_ROUND_UP(max_pages, SMB_DIRECT_MAX_SEND_SGES); + max_rw_wrs += rdma_rw_mr_factor(device, t->cm_id->port_num, + max_pages) * 2; + max_rw_wrs *= smb_direct_max_outstanding_rw_ops; + + max_send_wrs = smb_direct_send_credit_target + max_rw_wrs; + if (max_send_wrs > device->attrs.max_cqe || + max_send_wrs > device->attrs.max_qp_wr) { + ksmbd_err("consider lowering send_credit_target = %d, or max_outstanding_rw_ops = %d\n", + smb_direct_send_credit_target, + smb_direct_max_outstanding_rw_ops); + ksmbd_err("Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n", + device->attrs.max_cqe, device->attrs.max_qp_wr); + return -EINVAL; + } + + if (smb_direct_receive_credit_max > device->attrs.max_cqe || + smb_direct_receive_credit_max > device->attrs.max_qp_wr) { + ksmbd_err("consider lowering receive_credit_max = %d\n", + smb_direct_receive_credit_max); + ksmbd_err("Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n", + device->attrs.max_cqe, device->attrs.max_qp_wr); + return -EINVAL; + } + + if (device->attrs.max_send_sge < SMB_DIRECT_MAX_SEND_SGES) { + ksmbd_err("warning: device max_send_sge = %d too small\n", + device->attrs.max_send_sge); + return -EINVAL; + } + if (device->attrs.max_recv_sge < SMB_DIRECT_MAX_RECV_SGES) { + ksmbd_err("warning: device max_recv_sge = %d too small\n", + device->attrs.max_recv_sge); + return -EINVAL; + } + + t->recv_credits = 0; + t->count_avail_recvmsg = 0; + + t->recv_credit_max = smb_direct_receive_credit_max; + t->recv_credit_target = 10; + t->new_recv_credits = 0; + + t->send_credit_target = smb_direct_send_credit_target; + atomic_set(&t->send_credits, 0); + atomic_set(&t->rw_avail_ops, smb_direct_max_outstanding_rw_ops); + + t->max_send_size = smb_direct_max_send_size; + t->max_recv_size = smb_direct_max_receive_size; + t->max_fragmented_recv_size = smb_direct_max_fragmented_recv_size; + + cap->max_send_wr = max_send_wrs; + cap->max_recv_wr = t->recv_credit_max; + cap->max_send_sge = SMB_DIRECT_MAX_SEND_SGES; + cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES; + cap->max_inline_data = 0; + cap->max_rdma_ctxs = 0; + return 0; +} + +static void smb_direct_destroy_pools(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg; + + while ((recvmsg = get_free_recvmsg(t))) + mempool_free(recvmsg, t->recvmsg_mempool); + while ((recvmsg = get_empty_recvmsg(t))) + mempool_free(recvmsg, t->recvmsg_mempool); + + mempool_destroy(t->recvmsg_mempool); + t->recvmsg_mempool = NULL; + + kmem_cache_destroy(t->recvmsg_cache); + t->recvmsg_cache = NULL; + + mempool_destroy(t->sendmsg_mempool); + t->sendmsg_mempool = NULL; + + kmem_cache_destroy(t->sendmsg_cache); + t->sendmsg_cache = NULL; +} + +static int smb_direct_create_pools(struct smb_direct_transport *t) +{ + char name[80]; + int i; + struct smb_direct_recvmsg *recvmsg; + + snprintf(name, sizeof(name), "smb_direct_rqst_pool_%p", t); + t->sendmsg_cache = kmem_cache_create(name, + sizeof(struct smb_direct_sendmsg) + + sizeof(struct smb_direct_negotiate_resp), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!t->sendmsg_cache) + return -ENOMEM; + + t->sendmsg_mempool = mempool_create(t->send_credit_target, + mempool_alloc_slab, mempool_free_slab, + t->sendmsg_cache); + if (!t->sendmsg_mempool) + goto err; + + snprintf(name, sizeof(name), "smb_direct_resp_%p", t); + t->recvmsg_cache = kmem_cache_create(name, + sizeof(struct smb_direct_recvmsg) + + t->max_recv_size, + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!t->recvmsg_cache) + goto err; + + t->recvmsg_mempool = + mempool_create(t->recv_credit_max, mempool_alloc_slab, + mempool_free_slab, t->recvmsg_cache); + if (!t->recvmsg_mempool) + goto err; + + INIT_LIST_HEAD(&t->recvmsg_queue); + + for (i = 0; i < t->recv_credit_max; i++) { + recvmsg = mempool_alloc(t->recvmsg_mempool, GFP_KERNEL); + if (!recvmsg) + goto err; + recvmsg->transport = t; + list_add(&recvmsg->list, &t->recvmsg_queue); + } + t->count_avail_recvmsg = t->recv_credit_max; + + return 0; +err: + smb_direct_destroy_pools(t); + return -ENOMEM; +} + +static int smb_direct_create_qpair(struct smb_direct_transport *t, + struct ib_qp_cap *cap) +{ + int ret; + struct ib_qp_init_attr qp_attr; + + t->pd = ib_alloc_pd(t->cm_id->device, 0); + if (IS_ERR(t->pd)) { + ksmbd_err("Can't create RDMA PD\n"); + ret = PTR_ERR(t->pd); + t->pd = NULL; + return ret; + } + + t->send_cq = ib_alloc_cq(t->cm_id->device, t, + t->send_credit_target, 0, IB_POLL_WORKQUEUE); + if (IS_ERR(t->send_cq)) { + ksmbd_err("Can't create RDMA send CQ\n"); + ret = PTR_ERR(t->send_cq); + t->send_cq = NULL; + goto err; + } + + t->recv_cq = ib_alloc_cq(t->cm_id->device, t, + cap->max_send_wr + cap->max_rdma_ctxs, + 0, IB_POLL_WORKQUEUE); + if (IS_ERR(t->recv_cq)) { + ksmbd_err("Can't create RDMA recv CQ\n"); + ret = PTR_ERR(t->recv_cq); + t->recv_cq = NULL; + goto err; + } + + memset(&qp_attr, 0, sizeof(qp_attr)); + qp_attr.event_handler = smb_direct_qpair_handler; + qp_attr.qp_context = t; + qp_attr.cap = *cap; + qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + qp_attr.qp_type = IB_QPT_RC; + qp_attr.send_cq = t->send_cq; + qp_attr.recv_cq = t->recv_cq; + qp_attr.port_num = ~0; + + ret = rdma_create_qp(t->cm_id, t->pd, &qp_attr); + if (ret) { + ksmbd_err("Can't create RDMA QP: %d\n", ret); + goto err; + } + + t->qp = t->cm_id->qp; + t->cm_id->event_handler = smb_direct_cm_handler; + + return 0; +err: + if (t->qp) { + ib_destroy_qp(t->qp); + t->qp = NULL; + } + if (t->recv_cq) { + ib_destroy_cq(t->recv_cq); + t->recv_cq = NULL; + } + if (t->send_cq) { + ib_destroy_cq(t->send_cq); + t->send_cq = NULL; + } + if (t->pd) { + ib_dealloc_pd(t->pd); + t->pd = NULL; + } + return ret; +} + +static int smb_direct_prepare(struct ksmbd_transport *t) +{ + struct smb_direct_transport *st = SMB_DIRECT_TRANS(t); + int ret; + struct ib_qp_cap qp_cap; + + ret = smb_direct_init_params(st, &qp_cap); + if (ret) { + ksmbd_err("Can't configure RDMA parameters\n"); + return ret; + } + + ret = smb_direct_create_pools(st); + if (ret) { + ksmbd_err("Can't init RDMA pool: %d\n", ret); + return ret; + } + + ret = smb_direct_create_qpair(st, &qp_cap); + if (ret) { + ksmbd_err("Can't accept RDMA client: %d\n", ret); + return ret; + } + + ret = smb_direct_negotiate(st); + if (ret) { + ksmbd_err("Can't negotiate: %d\n", ret); + return ret; + } + + st->status = SMB_DIRECT_CS_CONNECTED; + return 0; +} + +static bool rdma_frwr_is_supported(struct ib_device_attr *attrs) +{ + if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) + return false; + if (attrs->max_fast_reg_page_list_len == 0) + return false; + return true; +} + +static int smb_direct_handle_connect_request(struct rdma_cm_id *new_cm_id) +{ + struct smb_direct_transport *t; + + if (!rdma_frwr_is_supported(&new_cm_id->device->attrs)) { + ksmbd_debug(RDMA, + "Fast Registration Work Requests is not supported. device capabilities=%llx\n", + new_cm_id->device->attrs.device_cap_flags); + return -EPROTONOSUPPORT; + } + + t = alloc_transport(new_cm_id); + if (!t) + return -ENOMEM; + + KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop, + KSMBD_TRANS(t)->conn, "ksmbd:r%u", SMB_DIRECT_PORT); + if (IS_ERR(KSMBD_TRANS(t)->handler)) { + int ret = PTR_ERR(KSMBD_TRANS(t)->handler); + + ksmbd_err("Can't start thread\n"); + free_transport(t); + return ret; + } + + return 0; +} + +static int smb_direct_listen_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + switch (event->event) { + case RDMA_CM_EVENT_CONNECT_REQUEST: { + int ret = smb_direct_handle_connect_request(cm_id); + + if (ret) { + ksmbd_err("Can't create transport: %d\n", ret); + return ret; + } + + ksmbd_debug(RDMA, "Received connection request. cm_id=%p\n", + cm_id); + break; + } + default: + ksmbd_err("Unexpected listen event. cm_id=%p, event=%s (%d)\n", + cm_id, + rdma_event_msg(event->event), event->event); + break; + } + return 0; +} + +static int smb_direct_listen(int port) +{ + int ret; + struct rdma_cm_id *cm_id; + struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + .sin_port = htons(port), + }; + + cm_id = rdma_create_id(&init_net, smb_direct_listen_handler, + &smb_direct_listener, RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(cm_id)) { + ksmbd_err("Can't create cm id: %ld\n", + PTR_ERR(cm_id)); + return PTR_ERR(cm_id); + } + + ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); + if (ret) { + ksmbd_err("Can't bind: %d\n", ret); + goto err; + } + + smb_direct_listener.cm_id = cm_id; + + ret = rdma_listen(cm_id, 10); + if (ret) { + ksmbd_err("Can't listen: %d\n", ret); + goto err; + } + return 0; +err: + smb_direct_listener.cm_id = NULL; + rdma_destroy_id(cm_id); + return ret; +} + +int ksmbd_rdma_init(void) +{ + int ret; + + smb_direct_listener.cm_id = NULL; + + /* When a client is running out of send credits, the credits are + * granted by the server's sending a packet using this queue. + * This avoids the situation that a clients cannot send packets + * for lack of credits + */ + smb_direct_wq = alloc_workqueue("ksmbd-smb_direct-wq", + WQ_HIGHPRI|WQ_MEM_RECLAIM, 0); + if (!smb_direct_wq) + return -ENOMEM; + + ret = smb_direct_listen(SMB_DIRECT_PORT); + if (ret) { + destroy_workqueue(smb_direct_wq); + smb_direct_wq = NULL; + ksmbd_err("Can't listen: %d\n", ret); + return ret; + } + + ksmbd_debug(RDMA, "init RDMA listener. cm_id=%p\n", + smb_direct_listener.cm_id); + return 0; +} + +int ksmbd_rdma_destroy(void) +{ + if (smb_direct_listener.cm_id) + rdma_destroy_id(smb_direct_listener.cm_id); + smb_direct_listener.cm_id = NULL; + + if (smb_direct_wq) { + flush_workqueue(smb_direct_wq); + destroy_workqueue(smb_direct_wq); + smb_direct_wq = NULL; + } + return 0; +} + +static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = { + .prepare = smb_direct_prepare, + .disconnect = smb_direct_disconnect, + .writev = smb_direct_writev, + .read = smb_direct_read, + .rdma_read = smb_direct_rdma_read, + .rdma_write = smb_direct_rdma_write, +}; diff --git a/fs/cifsd/transport_rdma.h b/fs/cifsd/transport_rdma.h new file mode 100644 index 000000000000..da60fcec3ede --- /dev/null +++ b/fs/cifsd/transport_rdma.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2017, Microsoft Corporation. + * Copyright (C) 2018, LG Electronics. + */ + +#ifndef __KSMBD_TRANSPORT_RDMA_H__ +#define __KSMBD_TRANSPORT_RDMA_H__ + +#define SMB_DIRECT_PORT 5445 + +/* SMB DIRECT negotiation request packet [MS-KSMBD] 2.2.1 */ +struct smb_direct_negotiate_req { + __le16 min_version; + __le16 max_version; + __le16 reserved; + __le16 credits_requested; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +/* SMB DIRECT negotiation response packet [MS-KSMBD] 2.2.2 */ +struct smb_direct_negotiate_resp { + __le16 min_version; + __le16 max_version; + __le16 negotiated_version; + __le16 reserved; + __le16 credits_requested; + __le16 credits_granted; + __le32 status; + __le32 max_readwrite_size; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001 + +/* SMB DIRECT data transfer packet with payload [MS-KSMBD] 2.2.3 */ +struct smb_direct_data_transfer { + __le16 credits_requested; + __le16 credits_granted; + __le16 flags; + __le16 reserved; + __le32 remaining_data_length; + __le32 data_offset; + __le32 data_length; + __le32 padding; + __u8 buffer[]; +} __packed; + +#ifdef CONFIG_SMB_SERVER_SMBDIRECT +int ksmbd_rdma_init(void); +int ksmbd_rdma_destroy(void); +#else +static inline int ksmbd_rdma_init(void) { return 0; } +static inline int ksmbd_rdma_destroy(void) { return 0; } +#endif + +#endif /* __KSMBD_TRANSPORT_RDMA_H__ */ diff --git a/fs/cifsd/transport_tcp.c b/fs/cifsd/transport_tcp.c new file mode 100644 index 000000000000..60ec9b2e0370 --- /dev/null +++ b/fs/cifsd/transport_tcp.c @@ -0,0 +1,624 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Namjae Jeon linkinjeon@kernel.org + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#include <linux/freezer.h> + +#include "smb_common.h" +#include "server.h" +#include "auth.h" +#include "buffer_pool.h" +#include "connection.h" +#include "transport_tcp.h" + +#define IFACE_STATE_DOWN (1 << 0) +#define IFACE_STATE_CONFIGURED (1 << 1) + +struct interface { + struct task_struct *ksmbd_kthread; + struct socket *ksmbd_socket; + struct list_head entry; + char *name; + struct mutex sock_release_lock; + int state; +}; + +static LIST_HEAD(iface_list); + +static int bind_additional_ifaces; + +struct tcp_transport { + struct ksmbd_transport transport; + struct socket *sock; + struct kvec *iov; + unsigned int nr_iov; +}; + +static struct ksmbd_transport_ops ksmbd_tcp_transport_ops; + +static void tcp_stop_kthread(struct task_struct *kthread); +static struct interface *alloc_iface(char *ifname); + +#define KSMBD_TRANS(t) (&(t)->transport) +#define TCP_TRANS(t) ((struct tcp_transport *)container_of(t, \ + struct tcp_transport, transport)) + +static inline void ksmbd_tcp_nodelay(struct socket *sock) +{ + tcp_sock_set_nodelay(sock->sk); +} + +static inline void ksmbd_tcp_reuseaddr(struct socket *sock) +{ + sock_set_reuseaddr(sock->sk); +} + +static inline void ksmbd_tcp_rcv_timeout(struct socket *sock, s64 secs) +{ + lock_sock(sock->sk); + if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1) + sock->sk->sk_rcvtimeo = secs * HZ; + else + sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; + release_sock(sock->sk); +} + +static inline void ksmbd_tcp_snd_timeout(struct socket *sock, s64 secs) +{ + sock_set_sndtimeo(sock->sk, secs); +} + +static struct tcp_transport *alloc_transport(struct socket *client_sk) +{ + struct tcp_transport *t; + struct ksmbd_conn *conn; + + t = kzalloc(sizeof(*t), GFP_KERNEL); + if (!t) + return NULL; + t->sock = client_sk; + + conn = ksmbd_conn_alloc(); + if (!conn) { + kfree(t); + return NULL; + } + + conn->transport = KSMBD_TRANS(t); + KSMBD_TRANS(t)->conn = conn; + KSMBD_TRANS(t)->ops = &ksmbd_tcp_transport_ops; + return t; +} + +static void free_transport(struct tcp_transport *t) +{ + kernel_sock_shutdown(t->sock, SHUT_RDWR); + sock_release(t->sock); + t->sock = NULL; + + ksmbd_conn_free(KSMBD_TRANS(t)->conn); + kfree(t->iov); + kfree(t); +} + +/** + * kvec_array_init() - initialize a IO vector segment + * @new: IO vector to be initialized + * @iov: base IO vector + * @nr_segs: number of segments in base iov + * @bytes: total iovec length so far for read + * + * Return: Number of IO segments + */ +static unsigned int kvec_array_init(struct kvec *new, struct kvec *iov, + unsigned int nr_segs, size_t bytes) +{ + size_t base = 0; + + while (bytes || !iov->iov_len) { + int copy = min(bytes, iov->iov_len); + + bytes -= copy; + base += copy; + if (iov->iov_len == base) { + iov++; + nr_segs--; + base = 0; + } + } + + memcpy(new, iov, sizeof(*iov) * nr_segs); + new->iov_base += base; + new->iov_len -= base; + return nr_segs; +} + +/** + * get_conn_iovec() - get connection iovec for reading from socket + * @t: TCP transport instance + * @nr_segs: number of segments in iov + * + * Return: return existing or newly allocate iovec + */ +static struct kvec *get_conn_iovec(struct tcp_transport *t, + unsigned int nr_segs) +{ + struct kvec *new_iov; + + if (t->iov && nr_segs <= t->nr_iov) + return t->iov; + + /* not big enough -- allocate a new one and release the old */ + new_iov = kmalloc_array(nr_segs, sizeof(*new_iov), GFP_KERNEL); + if (new_iov) { + kfree(t->iov); + t->iov = new_iov; + t->nr_iov = nr_segs; + } + return new_iov; +} + +static unsigned short ksmbd_tcp_get_port(const struct sockaddr *sa) +{ + switch (sa->sa_family) { + case AF_INET: + return ntohs(((struct sockaddr_in *)sa)->sin_port); + case AF_INET6: + return ntohs(((struct sockaddr_in6 *)sa)->sin6_port); + } + return 0; +} + +/** + * ksmbd_tcp_new_connection() - create a new tcp session on mount + * @sock: socket associated with new connection + * + * whenever a new connection is requested, create a conn thread + * (session thread) to handle new incoming smb requests from the connection + * + * Return: 0 on success, otherwise error + */ +static int ksmbd_tcp_new_connection(struct socket *client_sk) +{ + struct sockaddr *csin; + int rc = 0; + struct tcp_transport *t; + + t = alloc_transport(client_sk); + if (!t) + return -ENOMEM; + + csin = KSMBD_TCP_PEER_SOCKADDR(KSMBD_TRANS(t)->conn); + if (kernel_getpeername(client_sk, csin) < 0) { + ksmbd_err("client ip resolution failed\n"); + rc = -EINVAL; + goto out_error; + } + + KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop, + KSMBD_TRANS(t)->conn, + "ksmbd:%u", ksmbd_tcp_get_port(csin)); + if (IS_ERR(KSMBD_TRANS(t)->handler)) { + ksmbd_err("cannot start conn thread\n"); + rc = PTR_ERR(KSMBD_TRANS(t)->handler); + free_transport(t); + } + return rc; + +out_error: + free_transport(t); + return rc; +} + +/** + * ksmbd_kthread_fn() - listen to new SMB connections and callback server + * @p: arguments to forker thread + * + * Return: Returns a task_struct or ERR_PTR + */ +static int ksmbd_kthread_fn(void *p) +{ + struct socket *client_sk = NULL; + struct interface *iface = (struct interface *)p; + int ret; + + while (!kthread_should_stop()) { + mutex_lock(&iface->sock_release_lock); + if (!iface->ksmbd_socket) { + mutex_unlock(&iface->sock_release_lock); + break; + } + ret = kernel_accept(iface->ksmbd_socket, &client_sk, + O_NONBLOCK); + mutex_unlock(&iface->sock_release_lock); + if (ret) { + if (ret == -EAGAIN) + /* check for new connections every 100 msecs */ + schedule_timeout_interruptible(HZ / 10); + continue; + } + + ksmbd_debug(CONN, "connect success: accepted new connection\n"); + client_sk->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT; + client_sk->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT; + + ksmbd_tcp_new_connection(client_sk); + } + + ksmbd_debug(CONN, "releasing socket\n"); + return 0; +} + +/** + * ksmbd_create_ksmbd_kthread() - start forker thread + * + * start forker thread(ksmbd/0) at module init time to listen + * on port 445 for new SMB connection requests. It creates per connection + * server threads(ksmbd/x) + * + * Return: 0 on success or error number + */ +static int ksmbd_tcp_run_kthread(struct interface *iface) +{ + int rc; + struct task_struct *kthread; + + kthread = kthread_run(ksmbd_kthread_fn, (void *)iface, + "ksmbd-%s", iface->name); + if (IS_ERR(kthread)) { + rc = PTR_ERR(kthread); + return rc; + } + iface->ksmbd_kthread = kthread; + + return 0; +} + +/** + * ksmbd_tcp_readv() - read data from socket in given iovec + * @t: TCP transport instance + * @iov_orig: base IO vector + * @nr_segs: number of segments in base iov + * @to_read: number of bytes to read from socket + * + * Return: on success return number of bytes read from socket, + * otherwise return error number + */ +static int ksmbd_tcp_readv(struct tcp_transport *t, + struct kvec *iov_orig, + unsigned int nr_segs, + unsigned int to_read) +{ + int length = 0; + int total_read; + unsigned int segs; + struct msghdr ksmbd_msg; + struct kvec *iov; + struct ksmbd_conn *conn = KSMBD_TRANS(t)->conn; + + iov = get_conn_iovec(t, nr_segs); + if (!iov) + return -ENOMEM; + + ksmbd_msg.msg_control = NULL; + ksmbd_msg.msg_controllen = 0; + + for (total_read = 0; to_read; total_read += length, to_read -= length) { + try_to_freeze(); + + if (!ksmbd_conn_alive(conn)) { + total_read = -ESHUTDOWN; + break; + } + segs = kvec_array_init(iov, iov_orig, nr_segs, total_read); + + length = kernel_recvmsg(t->sock, &ksmbd_msg, + iov, segs, to_read, 0); + + if (length == -EINTR) { + total_read = -ESHUTDOWN; + break; + } else if (conn->status == KSMBD_SESS_NEED_RECONNECT) { + total_read = -EAGAIN; + break; + } else if (length == -ERESTARTSYS || length == -EAGAIN) { + usleep_range(1000, 2000); + length = 0; + continue; + } else if (length <= 0) { + total_read = -EAGAIN; + break; + } + } + return total_read; +} + +/** + * ksmbd_tcp_read() - read data from socket in given buffer + * @t: TCP transport instance + * @buf: buffer to store read data from socket + * @to_read: number of bytes to read from socket + * + * Return: on success return number of bytes read from socket, + * otherwise return error number + */ +static int ksmbd_tcp_read(struct ksmbd_transport *t, + char *buf, + unsigned int to_read) +{ + struct kvec iov; + + iov.iov_base = buf; + iov.iov_len = to_read; + + return ksmbd_tcp_readv(TCP_TRANS(t), &iov, 1, to_read); +} + +static int ksmbd_tcp_writev(struct ksmbd_transport *t, + struct kvec *iov, int nvecs, int size, + bool need_invalidate, unsigned int remote_key) + +{ + struct msghdr smb_msg = {.msg_flags = MSG_NOSIGNAL}; + + return kernel_sendmsg(TCP_TRANS(t)->sock, &smb_msg, iov, nvecs, size); +} + +static void ksmbd_tcp_disconnect(struct ksmbd_transport *t) +{ + free_transport(TCP_TRANS(t)); +} + +static void tcp_destroy_socket(struct socket *ksmbd_socket) +{ + int ret; + + if (!ksmbd_socket) + return; + + /* set zero to timeout */ + ksmbd_tcp_rcv_timeout(ksmbd_socket, 0); + ksmbd_tcp_snd_timeout(ksmbd_socket, 0); + + ret = kernel_sock_shutdown(ksmbd_socket, SHUT_RDWR); + if (ret) + ksmbd_err("Failed to shutdown socket: %d\n", ret); + else + sock_release(ksmbd_socket); +} + +/** + * create_socket - create socket for ksmbd/0 + * + * Return: Returns a task_struct or ERR_PTR + */ +static int create_socket(struct interface *iface) +{ + int ret; + struct sockaddr_in6 sin6; + struct sockaddr_in sin; + struct socket *ksmbd_socket; + bool ipv4 = false; + + ret = sock_create(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &ksmbd_socket); + if (ret) { + ksmbd_err("Can't create socket for ipv6, try ipv4: %d\n", ret); + ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, + &ksmbd_socket); + if (ret) { + ksmbd_err("Can't create socket for ipv4: %d\n", ret); + goto out_error; + } + + sin.sin_family = PF_INET; + sin.sin_addr.s_addr = htonl(INADDR_ANY); + sin.sin_port = htons(server_conf.tcp_port); + ipv4 = true; + } else { + sin6.sin6_family = PF_INET6; + sin6.sin6_addr = in6addr_any; + sin6.sin6_port = htons(server_conf.tcp_port); + } + + ksmbd_tcp_nodelay(ksmbd_socket); + ksmbd_tcp_reuseaddr(ksmbd_socket); + + ret = sock_setsockopt(ksmbd_socket, + SOL_SOCKET, + SO_BINDTODEVICE, + KERNEL_SOCKPTR(iface->name), + strlen(iface->name)); + if (ret != -ENODEV && ret < 0) { + ksmbd_err("Failed to set SO_BINDTODEVICE: %d\n", ret); + goto out_error; + } + + if (ipv4) + ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin, + sizeof(sin)); + else + ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin6, + sizeof(sin6)); + if (ret) { + ksmbd_err("Failed to bind socket: %d\n", ret); + goto out_error; + } + + ksmbd_socket->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT; + ksmbd_socket->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT; + + ret = kernel_listen(ksmbd_socket, KSMBD_SOCKET_BACKLOG); + if (ret) { + ksmbd_err("Port listen() error: %d\n", ret); + goto out_error; + } + + iface->ksmbd_socket = ksmbd_socket; + ret = ksmbd_tcp_run_kthread(iface); + if (ret) { + ksmbd_err("Can't start ksmbd main kthread: %d\n", ret); + goto out_error; + } + iface->state = IFACE_STATE_CONFIGURED; + + return 0; + +out_error: + tcp_destroy_socket(ksmbd_socket); + iface->ksmbd_socket = NULL; + return ret; +} + +static int ksmbd_netdev_event(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct net_device *netdev = netdev_notifier_info_to_dev(ptr); + struct interface *iface; + int ret, found = 0; + + switch (event) { + case NETDEV_UP: + if (netdev->priv_flags & IFF_BRIDGE_PORT) + return NOTIFY_OK; + + list_for_each_entry(iface, &iface_list, entry) { + if (!strcmp(iface->name, netdev->name)) { + found = 1; + if (iface->state != IFACE_STATE_DOWN) + break; + ret = create_socket(iface); + if (ret) + return NOTIFY_OK; + break; + } + } + if (!found && bind_additional_ifaces) { + iface = alloc_iface(kstrdup(netdev->name, GFP_KERNEL)); + if (!iface) + return NOTIFY_OK; + ret = create_socket(iface); + if (ret) + break; + } + break; + case NETDEV_DOWN: + list_for_each_entry(iface, &iface_list, entry) { + if (!strcmp(iface->name, netdev->name) && + iface->state == IFACE_STATE_CONFIGURED) { + tcp_stop_kthread(iface->ksmbd_kthread); + iface->ksmbd_kthread = NULL; + mutex_lock(&iface->sock_release_lock); + tcp_destroy_socket(iface->ksmbd_socket); + iface->ksmbd_socket = NULL; + mutex_unlock(&iface->sock_release_lock); + + iface->state = IFACE_STATE_DOWN; + break; + } + } + break; + } + + return NOTIFY_DONE; + +} + +static struct notifier_block ksmbd_netdev_notifier = { + .notifier_call = ksmbd_netdev_event, +}; + +int ksmbd_tcp_init(void) +{ + register_netdevice_notifier(&ksmbd_netdev_notifier); + + return 0; +} + +static void tcp_stop_kthread(struct task_struct *kthread) +{ + int ret; + + if (!kthread) + return; + + ret = kthread_stop(kthread); + if (ret) + ksmbd_err("failed to stop forker thread\n"); +} + +void ksmbd_tcp_destroy(void) +{ + struct interface *iface, *tmp; + + unregister_netdevice_notifier(&ksmbd_netdev_notifier); + + list_for_each_entry_safe(iface, tmp, &iface_list, entry) { + list_del(&iface->entry); + kfree(iface->name); + ksmbd_free(iface); + } +} + +static struct interface *alloc_iface(char *ifname) +{ + struct interface *iface; + + if (!ifname) + return NULL; + + iface = ksmbd_alloc(sizeof(struct interface)); + if (!iface) { + kfree(ifname); + return NULL; + } + + iface->name = ifname; + iface->state = IFACE_STATE_DOWN; + list_add(&iface->entry, &iface_list); + mutex_init(&iface->sock_release_lock); + return iface; +} + +int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz) +{ + int sz = 0; + + if (!ifc_list_sz) { + struct net_device *netdev; + + rtnl_lock(); + for_each_netdev(&init_net, netdev) { + if (netdev->priv_flags & IFF_BRIDGE_PORT) + continue; + if (!alloc_iface(kstrdup(netdev->name, GFP_KERNEL))) + return -ENOMEM; + } + rtnl_unlock(); + bind_additional_ifaces = 1; + return 0; + } + + while (ifc_list_sz > 0) { + if (!alloc_iface(kstrdup(ifc_list, GFP_KERNEL))) + return -ENOMEM; + + sz = strlen(ifc_list); + if (!sz) + break; + + ifc_list += sz + 1; + ifc_list_sz -= (sz + 1); + } + + bind_additional_ifaces = 0; + + return 0; +} + +static struct ksmbd_transport_ops ksmbd_tcp_transport_ops = { + .read = ksmbd_tcp_read, + .writev = ksmbd_tcp_writev, + .disconnect = ksmbd_tcp_disconnect, +}; diff --git a/fs/cifsd/transport_tcp.h b/fs/cifsd/transport_tcp.h new file mode 100644 index 000000000000..e338bebe322f --- /dev/null +++ b/fs/cifsd/transport_tcp.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_TRANSPORT_TCP_H__ +#define __KSMBD_TRANSPORT_TCP_H__ + +int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz); +int ksmbd_tcp_init(void); +void ksmbd_tcp_destroy(void); + +#endif /* __KSMBD_TRANSPORT_TCP_H__ */