// SPDX-License-Identifier: GPL-2.0-only /* * Fd transport layer. Includes deprecated socket layer. * * Copyright (C) 2006 by Russ Cox * Copyright (C) 2004-2005 by Latchesar Ionkov * Copyright (C) 2004-2008 by Eric Van Hensbergen * Copyright (C) 1997-2002 by Ron Minnich */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* killme */ #define P9_PORT 564 #define MAX_SOCK_BUF (1024*1024) #define MAXPOLLWADDR 2 static struct p9_trans_module p9_tcp_trans; static struct p9_trans_module p9_fd_trans; /** * struct p9_fd_opts - per-transport options * @rfd: file descriptor for reading (trans=fd) * @wfd: file descriptor for writing (trans=fd) * @port: port to connect to (trans=tcp) * @privport: port is privileged */ struct p9_fd_opts { int rfd; int wfd; u16 port; bool privport; }; /* * Option Parsing (code inspired by NFS code) * - a little lazy - parse all fd-transport options */ enum { /* Options that take integer arguments */ Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, /* Options that take no arguments */ Opt_privport, }; static const match_table_t tokens = { {Opt_port, "port=%u"}, {Opt_rfdno, "rfdno=%u"}, {Opt_wfdno, "wfdno=%u"}, {Opt_privport, "privport"}, {Opt_err, NULL}, }; enum { Rworksched = 1, /* read work scheduled or running */ Rpending = 2, /* can read */ Wworksched = 4, /* write work scheduled or running */ Wpending = 8, /* can write */ }; struct p9_poll_wait { struct p9_conn *conn; wait_queue_entry_t wait; wait_queue_head_t *wait_addr; }; /** * struct p9_conn - fd mux connection state information * @mux_list: list link for mux to manage multiple connections (?) * @client: reference to client instance for this connection * @err: error state * @req_lock: lock protecting req_list and requests statuses * @req_list: accounting for requests which have been sent * @unsent_req_list: accounting for requests that haven't been sent * @rreq: read request * @wreq: write request * @tmp_buf: temporary buffer to read in header * @rc: temporary fcall for reading current frame * @wpos: write position for current frame * @wsize: amount of data to write for current frame * @wbuf: current write buffer * @poll_pending_link: pending links to be polled per conn * @poll_wait: array of wait_q's for various worker threads * @pt: poll state * @rq: current read work * @wq: current write work * @wsched: ???? * */ struct p9_conn { struct list_head mux_list; struct p9_client *client; int err; spinlock_t req_lock; struct list_head req_list; struct list_head unsent_req_list; struct p9_req_t *rreq; struct p9_req_t *wreq; char tmp_buf[P9_HDRSZ]; struct p9_fcall rc; int wpos; int wsize; char *wbuf; struct list_head poll_pending_link; struct p9_poll_wait poll_wait[MAXPOLLWADDR]; poll_table pt; struct work_struct rq; struct work_struct wq; unsigned long wsched; }; /** * struct p9_trans_fd - transport state * @rd: reference to file to read from * @wr: reference of file to write to * @conn: connection state reference * */ struct p9_trans_fd { struct file *rd; struct file *wr; struct p9_conn conn; }; static void p9_poll_workfn(struct work_struct *work); static DEFINE_SPINLOCK(p9_poll_lock); static LIST_HEAD(p9_poll_pending_list); static DECLARE_WORK(p9_poll_work, p9_poll_workfn); static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; static void p9_mux_poll_stop(struct p9_conn *m) { unsigned long flags; int i; for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { struct p9_poll_wait *pwait = &m->poll_wait[i]; if (pwait->wait_addr) { remove_wait_queue(pwait->wait_addr, &pwait->wait); pwait->wait_addr = NULL; } } spin_lock_irqsave(&p9_poll_lock, flags); list_del_init(&m->poll_pending_link); spin_unlock_irqrestore(&p9_poll_lock, flags); flush_work(&p9_poll_work); } /** * p9_conn_cancel - cancel all pending requests with error * @m: mux data * @err: error code * */ static void p9_conn_cancel(struct p9_conn *m, int err) { struct p9_req_t *req, *rtmp; LIST_HEAD(cancel_list); p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); spin_lock(&m->req_lock); if (READ_ONCE(m->err)) { spin_unlock(&m->req_lock); return; } WRITE_ONCE(m->err, err); ASSERT_EXCLUSIVE_WRITER(m->err); list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { list_move(&req->req_list, &cancel_list); WRITE_ONCE(req->status, REQ_STATUS_ERROR); } list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { list_move(&req->req_list, &cancel_list); WRITE_ONCE(req->status, REQ_STATUS_ERROR); } spin_unlock(&m->req_lock); list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); list_del(&req->req_list); if (!req->t_err) req->t_err = err; p9_client_cb(m->client, req, REQ_STATUS_ERROR); } } static __poll_t p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) { __poll_t ret; struct p9_trans_fd *ts = NULL; if (client && client->status == Connected) ts = client->trans; if (!ts) { if (err) *err = -EREMOTEIO; return EPOLLERR; } ret = vfs_poll(ts->rd, pt); if (ts->rd != ts->wr) ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); return ret; } /** * p9_fd_read- read from a fd * @client: client instance * @v: buffer to receive data into * @len: size of receive buffer * */ static int p9_fd_read(struct p9_client *client, void *v, int len) { int ret; struct p9_trans_fd *ts = NULL; loff_t pos; if (client && client->status != Disconnected) ts = client->trans; if (!ts) return -EREMOTEIO; if (!(ts->rd->f_flags & O_NONBLOCK)) p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); pos = ts->rd->f_pos; ret = kernel_read(ts->rd, v, len, &pos); if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) client->status = Disconnected; return ret; } /** * p9_read_work - called when there is some data to be read from a transport * @work: container of work to be done * */ static void p9_read_work(struct work_struct *work) { __poll_t n; int err; struct p9_conn *m; m = container_of(work, struct p9_conn, rq); if (READ_ONCE(m->err) < 0) return; p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); if (!m->rc.sdata) { m->rc.sdata = m->tmp_buf; m->rc.offset = 0; m->rc.capacity = P9_HDRSZ; /* start by reading header */ } clear_bit(Rpending, &m->wsched); p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", m, m->rc.offset, m->rc.capacity, m->rc.capacity - m->rc.offset); err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, m->rc.capacity - m->rc.offset); p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); if (err == -EAGAIN) goto end_clear; if (err <= 0) goto error; m->rc.offset += err; /* header read in */ if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { p9_debug(P9_DEBUG_TRANS, "got new header\n"); /* Header size */ m->rc.size = P9_HDRSZ; err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); if (err) { p9_debug(P9_DEBUG_ERROR, "error parsing header: %d\n", err); goto error; } p9_debug(P9_DEBUG_TRANS, "mux %p pkt: size: %d bytes tag: %d\n", m, m->rc.size, m->rc.tag); m->rreq = p9_tag_lookup(m->client, m->rc.tag); if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", m->rc.tag); err = -EIO; goto error; } if (m->rc.size > m->rreq->rc.capacity) { p9_debug(P9_DEBUG_ERROR, "requested packet size too big: %d for tag %d with capacity %zd\n", m->rc.size, m->rc.tag, m->rreq->rc.capacity); err = -EIO; goto error; } if (!m->rreq->rc.sdata) { p9_debug(P9_DEBUG_ERROR, "No recv fcall for tag %d (req %p), disconnecting!\n", m->rc.tag, m->rreq); p9_req_put(m->client, m->rreq); m->rreq = NULL; err = -EIO; goto error; } m->rc.sdata = m->rreq->rc.sdata; memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); m->rc.capacity = m->rc.size; } /* packet is read in * not an else because some packets (like clunk) have no payload */ if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { p9_debug(P9_DEBUG_TRANS, "got new packet\n"); m->rreq->rc.size = m->rc.offset; spin_lock(&m->req_lock); if (m->rreq->status == REQ_STATUS_SENT) { list_del(&m->rreq->req_list); p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); } else if (m->rreq->status == REQ_STATUS_FLSHD) { /* Ignore replies associated with a cancelled request. */ p9_debug(P9_DEBUG_TRANS, "Ignore replies associated with a cancelled request\n"); } else { spin_unlock(&m->req_lock); p9_debug(P9_DEBUG_ERROR, "Request tag %d errored out while we were reading the reply\n", m->rc.tag); err = -EIO; goto error; } spin_unlock(&m->req_lock); m->rc.sdata = NULL; m->rc.offset = 0; m->rc.capacity = 0; p9_req_put(m->client, m->rreq); m->rreq = NULL; } end_clear: clear_bit(Rworksched, &m->wsched); if (!list_empty(&m->req_list)) { if (test_and_clear_bit(Rpending, &m->wsched)) n = EPOLLIN; else n = p9_fd_poll(m->client, NULL, NULL); if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); schedule_work(&m->rq); } } return; error: p9_conn_cancel(m, err); clear_bit(Rworksched, &m->wsched); } /** * p9_fd_write - write to a socket * @client: client instance * @v: buffer to send data from * @len: size of send buffer * */ static int p9_fd_write(struct p9_client *client, void *v, int len) { ssize_t ret; struct p9_trans_fd *ts = NULL; if (client && client->status != Disconnected) ts = client->trans; if (!ts) return -EREMOTEIO; if (!(ts->wr->f_flags & O_NONBLOCK)) p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) client->status = Disconnected; return ret; } /** * p9_write_work - called when a transport can send some data * @work: container for work to be done * */ static void p9_write_work(struct work_struct *work) { __poll_t n; int err; struct p9_conn *m; struct p9_req_t *req; m = container_of(work, struct p9_conn, wq); if (READ_ONCE(m->err) < 0) { clear_bit(Wworksched, &m->wsched); return; } if (!m->wsize) { spin_lock(&m->req_lock); if (list_empty(&m->unsent_req_list)) { clear_bit(Wworksched, &m->wsched); spin_unlock(&m->req_lock); return; } req = list_entry(m->unsent_req_list.next, struct p9_req_t, req_list); WRITE_ONCE(req->status, REQ_STATUS_SENT); p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); list_move_tail(&req->req_list, &m->req_list); m->wbuf = req->tc.sdata; m->wsize = req->tc.size; m->wpos = 0; p9_req_get(req); m->wreq = req; spin_unlock(&m->req_lock); } p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos, m->wsize); clear_bit(Wpending, &m->wsched); err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); if (err == -EAGAIN) goto end_clear; if (err < 0) goto error; else if (err == 0) { err = -EREMOTEIO; goto error; } m->wpos += err; if (m->wpos == m->wsize) { m->wpos = m->wsize = 0; p9_req_put(m->client, m->wreq); m->wreq = NULL; } end_clear: clear_bit(Wworksched, &m->wsched); if (m->wsize || !list_empty(&m->unsent_req_list)) { if (test_and_clear_bit(Wpending, &m->wsched)) n = EPOLLOUT; else n = p9_fd_poll(m->client, NULL, NULL); if ((n & EPOLLOUT) && !test_and_set_bit(Wworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); schedule_work(&m->wq); } } return; error: p9_conn_cancel(m, err); clear_bit(Wworksched, &m->wsched); } static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) { struct p9_poll_wait *pwait = container_of(wait, struct p9_poll_wait, wait); struct p9_conn *m = pwait->conn; unsigned long flags; spin_lock_irqsave(&p9_poll_lock, flags); if (list_empty(&m->poll_pending_link)) list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); spin_unlock_irqrestore(&p9_poll_lock, flags); schedule_work(&p9_poll_work); return 1; } /** * p9_pollwait - add poll task to the wait queue * @filp: file pointer being polled * @wait_address: wait_q to block on * @p: poll state * * called by files poll operation to add v9fs-poll task to files wait queue */ static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) { struct p9_conn *m = container_of(p, struct p9_conn, pt); struct p9_poll_wait *pwait = NULL; int i; for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { if (m->poll_wait[i].wait_addr == NULL) { pwait = &m->poll_wait[i]; break; } } if (!pwait) { p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); return; } pwait->conn = m; pwait->wait_addr = wait_address; init_waitqueue_func_entry(&pwait->wait, p9_pollwake); add_wait_queue(wait_address, &pwait->wait); } /** * p9_conn_create - initialize the per-session mux data * @client: client instance * * Note: Creates the polling task if this is the first session. */ static void p9_conn_create(struct p9_client *client) { __poll_t n; struct p9_trans_fd *ts = client->trans; struct p9_conn *m = &ts->conn; p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); INIT_LIST_HEAD(&m->mux_list); m->client = client; spin_lock_init(&m->req_lock); INIT_LIST_HEAD(&m->req_list); INIT_LIST_HEAD(&m->unsent_req_list); INIT_WORK(&m->rq, p9_read_work); INIT_WORK(&m->wq, p9_write_work); INIT_LIST_HEAD(&m->poll_pending_link); init_poll_funcptr(&m->pt, p9_pollwait); n = p9_fd_poll(client, &m->pt, NULL); if (n & EPOLLIN) { p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); set_bit(Rpending, &m->wsched); } if (n & EPOLLOUT) { p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); set_bit(Wpending, &m->wsched); } } /** * p9_poll_mux - polls a mux and schedules read or write works if necessary * @m: connection to poll * */ static void p9_poll_mux(struct p9_conn *m) { __poll_t n; int err = -ECONNRESET; if (READ_ONCE(m->err) < 0) return; n = p9_fd_poll(m->client, NULL, &err); if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); p9_conn_cancel(m, err); } if (n & EPOLLIN) { set_bit(Rpending, &m->wsched); p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); if (!test_and_set_bit(Rworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); schedule_work(&m->rq); } } if (n & EPOLLOUT) { set_bit(Wpending, &m->wsched); p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); if ((m->wsize || !list_empty(&m->unsent_req_list)) && !test_and_set_bit(Wworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); schedule_work(&m->wq); } } } /** * p9_fd_request - send 9P request * The function can sleep until the request is scheduled for sending. * The function can be interrupted. Return from the function is not * a guarantee that the request is sent successfully. * * @client: client instance * @req: request to be sent * */ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) { int err; struct p9_trans_fd *ts = client->trans; struct p9_conn *m = &ts->conn; p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m, current, &req->tc, req->tc.id); spin_lock(&m->req_lock); err = READ_ONCE(m->err); if (err < 0) { spin_unlock(&m->req_lock); return err; } WRITE_ONCE(req->status, REQ_STATUS_UNSENT); list_add_tail(&req->req_list, &m->unsent_req_list); spin_unlock(&m->req_lock); p9_poll_mux(m); return 0; } static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) { struct p9_trans_fd *ts = client->trans; struct p9_conn *m = &ts->conn; int ret = 1; p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); spin_lock(&m->req_lock); if (req->status == REQ_STATUS_UNSENT) { list_del(&req->req_list); WRITE_ONCE(req->status, REQ_STATUS_FLSHD); p9_req_put(client, req); ret = 0; } spin_unlock(&m->req_lock); return ret; } static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) { struct p9_trans_fd *ts = client->trans; struct p9_conn *m = &ts->conn; p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); spin_lock(&m->req_lock); /* Ignore cancelled request if status changed since the request was * processed in p9_client_flush() */ if (req->status != REQ_STATUS_SENT) { spin_unlock(&m->req_lock); return 0; } /* we haven't received a response for oldreq, * remove it from the list. */ list_del(&req->req_list); WRITE_ONCE(req->status, REQ_STATUS_FLSHD); spin_unlock(&m->req_lock); p9_req_put(client, req); return 0; } static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) { if (clnt->trans_mod == &p9_tcp_trans) { if (clnt->trans_opts.tcp.port != P9_PORT) seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); } else if (clnt->trans_mod == &p9_fd_trans) { if (clnt->trans_opts.fd.rfd != ~0) seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); if (clnt->trans_opts.fd.wfd != ~0) seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); } return 0; } /** * parse_opts - parse mount options into p9_fd_opts structure * @params: options string passed from mount * @opts: fd transport-specific structure to parse options into * * Returns 0 upon success, -ERRNO upon failure */ static int parse_opts(char *params, struct p9_fd_opts *opts) { char *p; substring_t args[MAX_OPT_ARGS]; int option; char *options, *tmp_options; opts->port = P9_PORT; opts->rfd = ~0; opts->wfd = ~0; opts->privport = false; if (!params) return 0; tmp_options = kstrdup(params, GFP_KERNEL); if (!tmp_options) { p9_debug(P9_DEBUG_ERROR, "failed to allocate copy of option string\n"); return -ENOMEM; } options = tmp_options; while ((p = strsep(&options, ",")) != NULL) { int token; int r; if (!*p) continue; token = match_token(p, tokens, args); if ((token != Opt_err) && (token != Opt_privport)) { r = match_int(&args[0], &option); if (r < 0) { p9_debug(P9_DEBUG_ERROR, "integer field, but no integer?\n"); continue; } } switch (token) { case Opt_port: opts->port = option; break; case Opt_rfdno: opts->rfd = option; break; case Opt_wfdno: opts->wfd = option; break; case Opt_privport: opts->privport = true; break; default: continue; } } kfree(tmp_options); return 0; } static int p9_fd_open(struct p9_client *client, int rfd, int wfd) { struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); if (!ts) return -ENOMEM; ts->rd = fget(rfd); if (!ts->rd) goto out_free_ts; if (!(ts->rd->f_mode & FMODE_READ)) goto out_put_rd; /* Prevent workers from hanging on IO when fd is a pipe. * It's technically possible for userspace or concurrent mounts to * modify this flag concurrently, which will likely result in a * broken filesystem. However, just having bad flags here should * not crash the kernel or cause any other sort of bug, so mark this * particular data race as intentional so that tooling (like KCSAN) * can allow it and detect further problems. */ data_race(ts->rd->f_flags |= O_NONBLOCK); ts->wr = fget(wfd); if (!ts->wr) goto out_put_rd; if (!(ts->wr->f_mode & FMODE_WRITE)) goto out_put_wr; data_race(ts->wr->f_flags |= O_NONBLOCK); client->trans = ts; client->status = Connected; return 0; out_put_wr: fput(ts->wr); out_put_rd: fput(ts->rd); out_free_ts: kfree(ts); return -EIO; } static int p9_socket_open(struct p9_client *client, struct socket *csocket) { struct p9_trans_fd *p; struct file *file; p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); if (!p) { sock_release(csocket); return -ENOMEM; } csocket->sk->sk_allocation = GFP_NOIO; csocket->sk->sk_use_task_frag = false; file = sock_alloc_file(csocket, 0, NULL); if (IS_ERR(file)) { pr_err("%s (%d): failed to map fd\n", __func__, task_pid_nr(current)); kfree(p); return PTR_ERR(file); } get_file(file); p->wr = p->rd = file; client->trans = p; client->status = Connected; p->rd->f_flags |= O_NONBLOCK; p9_conn_create(client); return 0; } /** * p9_conn_destroy - cancels all pending requests of mux * @m: mux to destroy * */ static void p9_conn_destroy(struct p9_conn *m) { p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m, m->mux_list.prev, m->mux_list.next); p9_mux_poll_stop(m); cancel_work_sync(&m->rq); if (m->rreq) { p9_req_put(m->client, m->rreq); m->rreq = NULL; } cancel_work_sync(&m->wq); if (m->wreq) { p9_req_put(m->client, m->wreq); m->wreq = NULL; } p9_conn_cancel(m, -ECONNRESET); m->client = NULL; } /** * p9_fd_close - shutdown file descriptor transport * @client: client instance * */ static void p9_fd_close(struct p9_client *client) { struct p9_trans_fd *ts; if (!client) return; ts = client->trans; if (!ts) return; client->status = Disconnected; p9_conn_destroy(&ts->conn); if (ts->rd) fput(ts->rd); if (ts->wr) fput(ts->wr); kfree(ts); } static int p9_bind_privport(struct socket *sock) { struct sockaddr_storage stor = { 0 }; int port, err = -EINVAL; stor.ss_family = sock->ops->family; if (stor.ss_family == AF_INET) ((struct sockaddr_in *)&stor)->sin_addr.s_addr = htonl(INADDR_ANY); else ((struct sockaddr_in6 *)&stor)->sin6_addr = in6addr_any; for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { if (stor.ss_family == AF_INET) ((struct sockaddr_in *)&stor)->sin_port = htons((ushort)port); else ((struct sockaddr_in6 *)&stor)->sin6_port = htons((ushort)port); err = kernel_bind(sock, (struct sockaddr *)&stor, sizeof(stor)); if (err != -EADDRINUSE) break; } return err; } static int p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) { int err; char port_str[6]; struct socket *csocket; struct sockaddr_storage stor = { 0 }; struct p9_fd_opts opts; err = parse_opts(args, &opts); if (err < 0) return err; if (!addr) return -EINVAL; sprintf(port_str, "%u", opts.port); err = inet_pton_with_scope(current->nsproxy->net_ns, AF_UNSPEC, addr, port_str, &stor); if (err < 0) return err; csocket = NULL; client->trans_opts.tcp.port = opts.port; client->trans_opts.tcp.privport = opts.privport; err = __sock_create(current->nsproxy->net_ns, stor.ss_family, SOCK_STREAM, IPPROTO_TCP, &csocket, 1); if (err) { pr_err("%s (%d): problem creating socket\n", __func__, task_pid_nr(current)); return err; } if (opts.privport) { err = p9_bind_privport(csocket); if (err < 0) { pr_err("%s (%d): problem binding to privport\n", __func__, task_pid_nr(current)); sock_release(csocket); return err; } } err = READ_ONCE(csocket->ops)->connect(csocket, (struct sockaddr *)&stor, sizeof(stor), 0); if (err < 0) { pr_err("%s (%d): problem connecting socket to %s\n", __func__, task_pid_nr(current), addr); sock_release(csocket); return err; } return p9_socket_open(client, csocket); } static int p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) { int err; struct socket *csocket; struct sockaddr_un sun_server; csocket = NULL; if (!addr || !strlen(addr)) return -EINVAL; if (strlen(addr) >= UNIX_PATH_MAX) { pr_err("%s (%d): address too long: %s\n", __func__, task_pid_nr(current), addr); return -ENAMETOOLONG; } sun_server.sun_family = PF_UNIX; strcpy(sun_server.sun_path, addr); err = __sock_create(current->nsproxy->net_ns, PF_UNIX, SOCK_STREAM, 0, &csocket, 1); if (err < 0) { pr_err("%s (%d): problem creating socket\n", __func__, task_pid_nr(current)); return err; } err = READ_ONCE(csocket->ops)->connect(csocket, (struct sockaddr *)&sun_server, sizeof(struct sockaddr_un) - 1, 0); if (err < 0) { pr_err("%s (%d): problem connecting socket: %s: %d\n", __func__, task_pid_nr(current), addr, err); sock_release(csocket); return err; } return p9_socket_open(client, csocket); } static int p9_fd_create(struct p9_client *client, const char *addr, char *args) { int err; struct p9_fd_opts opts; err = parse_opts(args, &opts); if (err < 0) return err; client->trans_opts.fd.rfd = opts.rfd; client->trans_opts.fd.wfd = opts.wfd; if (opts.rfd == ~0 || opts.wfd == ~0) { pr_err("Insufficient options for proto=fd\n"); return -ENOPROTOOPT; } err = p9_fd_open(client, opts.rfd, opts.wfd); if (err < 0) return err; p9_conn_create(client); return 0; } static struct p9_trans_module p9_tcp_trans = { .name = "tcp", .maxsize = MAX_SOCK_BUF, .pooled_rbuffers = false, .def = 0, .create = p9_fd_create_tcp, .close = p9_fd_close, .request = p9_fd_request, .cancel = p9_fd_cancel, .cancelled = p9_fd_cancelled, .show_options = p9_fd_show_options, .owner = THIS_MODULE, }; MODULE_ALIAS_9P("tcp"); static struct p9_trans_module p9_unix_trans = { .name = "unix", .maxsize = MAX_SOCK_BUF, .def = 0, .create = p9_fd_create_unix, .close = p9_fd_close, .request = p9_fd_request, .cancel = p9_fd_cancel, .cancelled = p9_fd_cancelled, .show_options = p9_fd_show_options, .owner = THIS_MODULE, }; MODULE_ALIAS_9P("unix"); static struct p9_trans_module p9_fd_trans = { .name = "fd", .maxsize = MAX_SOCK_BUF, .def = 0, .create = p9_fd_create, .close = p9_fd_close, .request = p9_fd_request, .cancel = p9_fd_cancel, .cancelled = p9_fd_cancelled, .show_options = p9_fd_show_options, .owner = THIS_MODULE, }; MODULE_ALIAS_9P("fd"); /** * p9_poll_workfn - poll worker thread * @work: work queue * * polls all v9fs transports for new events and queues the appropriate * work to the work queue * */ static void p9_poll_workfn(struct work_struct *work) { unsigned long flags; p9_debug(P9_DEBUG_TRANS, "start %p\n", current); spin_lock_irqsave(&p9_poll_lock, flags); while (!list_empty(&p9_poll_pending_list)) { struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, struct p9_conn, poll_pending_link); list_del_init(&conn->poll_pending_link); spin_unlock_irqrestore(&p9_poll_lock, flags); p9_poll_mux(conn); spin_lock_irqsave(&p9_poll_lock, flags); } spin_unlock_irqrestore(&p9_poll_lock, flags); p9_debug(P9_DEBUG_TRANS, "finish\n"); } static int __init p9_trans_fd_init(void) { v9fs_register_trans(&p9_tcp_trans); v9fs_register_trans(&p9_unix_trans); v9fs_register_trans(&p9_fd_trans); return 0; } static void __exit p9_trans_fd_exit(void) { flush_work(&p9_poll_work); v9fs_unregister_trans(&p9_tcp_trans); v9fs_unregister_trans(&p9_unix_trans); v9fs_unregister_trans(&p9_fd_trans); } module_init(p9_trans_fd_init); module_exit(p9_trans_fd_exit); MODULE_AUTHOR("Eric Van Hensbergen "); MODULE_DESCRIPTION("Filedescriptor Transport for 9P"); MODULE_LICENSE("GPL");