From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- net/bluetooth/cmtp/core.c | 504 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 504 insertions(+) create mode 100644 net/bluetooth/cmtp/core.c (limited to 'net/bluetooth/cmtp/core.c') diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c new file mode 100644 index 00000000000..20ce04f2be8 --- /dev/null +++ b/net/bluetooth/cmtp/core.c @@ -0,0 +1,504 @@ +/* + CMTP implementation for Linux Bluetooth stack (BlueZ). + Copyright (C) 2002-2003 Marcel Holtmann + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +#include "cmtp.h" + +#ifndef CONFIG_BT_CMTP_DEBUG +#undef BT_DBG +#define BT_DBG(D...) +#endif + +#define VERSION "1.0" + +static DECLARE_RWSEM(cmtp_session_sem); +static LIST_HEAD(cmtp_session_list); + +static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) +{ + struct cmtp_session *session; + struct list_head *p; + + BT_DBG(""); + + list_for_each(p, &cmtp_session_list) { + session = list_entry(p, struct cmtp_session, list); + if (!bacmp(bdaddr, &session->bdaddr)) + return session; + } + return NULL; +} + +static void __cmtp_link_session(struct cmtp_session *session) +{ + __module_get(THIS_MODULE); + list_add(&session->list, &cmtp_session_list); +} + +static void __cmtp_unlink_session(struct cmtp_session *session) +{ + list_del(&session->list); + module_put(THIS_MODULE); +} + +static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) +{ + bacpy(&ci->bdaddr, &session->bdaddr); + + ci->flags = session->flags; + ci->state = session->state; + + ci->num = session->num; +} + + +static inline int cmtp_alloc_block_id(struct cmtp_session *session) +{ + int i, id = -1; + + for (i = 0; i < 16; i++) + if (!test_and_set_bit(i, &session->blockids)) { + id = i; + break; + } + + return id; +} + +static inline void cmtp_free_block_id(struct cmtp_session *session, int id) +{ + clear_bit(id, &session->blockids); +} + +static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) +{ + struct sk_buff *skb = session->reassembly[id], *nskb; + int size; + + BT_DBG("session %p buf %p count %d", session, buf, count); + + size = (skb) ? skb->len + count : count; + + if (!(nskb = alloc_skb(size, GFP_ATOMIC))) { + BT_ERR("Can't allocate memory for CAPI message"); + return; + } + + if (skb && (skb->len > 0)) + memcpy(skb_put(nskb, skb->len), skb->data, skb->len); + + memcpy(skb_put(nskb, count), buf, count); + + session->reassembly[id] = nskb; + + if (skb) + kfree_skb(skb); +} + +static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) +{ + __u8 hdr, hdrlen, id; + __u16 len; + + BT_DBG("session %p skb %p len %d", session, skb, skb->len); + + while (skb->len > 0) { + hdr = skb->data[0]; + + switch (hdr & 0xc0) { + case 0x40: + hdrlen = 2; + len = skb->data[1]; + break; + case 0x80: + hdrlen = 3; + len = skb->data[1] | (skb->data[2] << 8); + break; + default: + hdrlen = 1; + len = 0; + break; + } + + id = (hdr & 0x3c) >> 2; + + BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); + + if (hdrlen + len > skb->len) { + BT_ERR("Wrong size or header information in CMTP frame"); + break; + } + + if (len == 0) { + skb_pull(skb, hdrlen); + continue; + } + + switch (hdr & 0x03) { + case 0x00: + cmtp_add_msgpart(session, id, skb->data + hdrlen, len); + cmtp_recv_capimsg(session, session->reassembly[id]); + session->reassembly[id] = NULL; + break; + case 0x01: + cmtp_add_msgpart(session, id, skb->data + hdrlen, len); + break; + default: + if (session->reassembly[id] != NULL) + kfree_skb(session->reassembly[id]); + session->reassembly[id] = NULL; + break; + } + + skb_pull(skb, hdrlen + len); + } + + kfree_skb(skb); + return 0; +} + +static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) +{ + struct socket *sock = session->sock; + struct kvec iv = { data, len }; + struct msghdr msg; + + BT_DBG("session %p data %p len %d", session, data, len); + + if (!len) + return 0; + + memset(&msg, 0, sizeof(msg)); + + return kernel_sendmsg(sock, &msg, &iv, 1, len); +} + +static int cmtp_process_transmit(struct cmtp_session *session) +{ + struct sk_buff *skb, *nskb; + unsigned char *hdr; + unsigned int size, tail; + + BT_DBG("session %p", session); + + if (!(nskb = alloc_skb(session->mtu, GFP_ATOMIC))) { + BT_ERR("Can't allocate memory for new frame"); + return -ENOMEM; + } + + while ((skb = skb_dequeue(&session->transmit))) { + struct cmtp_scb *scb = (void *) skb->cb; + + if ((tail = (session->mtu - nskb->len)) < 5) { + cmtp_send_frame(session, nskb->data, nskb->len); + skb_trim(nskb, 0); + tail = session->mtu; + } + + size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); + + if ((scb->id < 0) && ((scb->id = cmtp_alloc_block_id(session)) < 0)) { + skb_queue_head(&session->transmit, skb); + break; + } + + if (size < 256) { + hdr = skb_put(nskb, 2); + hdr[0] = 0x40 + | ((scb->id << 2) & 0x3c) + | ((skb->len == size) ? 0x00 : 0x01); + hdr[1] = size; + } else { + hdr = skb_put(nskb, 3); + hdr[0] = 0x80 + | ((scb->id << 2) & 0x3c) + | ((skb->len == size) ? 0x00 : 0x01); + hdr[1] = size & 0xff; + hdr[2] = size >> 8; + } + + memcpy(skb_put(nskb, size), skb->data, size); + skb_pull(skb, size); + + if (skb->len > 0) { + skb_queue_head(&session->transmit, skb); + } else { + cmtp_free_block_id(session, scb->id); + if (scb->data) { + cmtp_send_frame(session, nskb->data, nskb->len); + skb_trim(nskb, 0); + } + kfree_skb(skb); + } + } + + cmtp_send_frame(session, nskb->data, nskb->len); + + kfree_skb(nskb); + + return skb_queue_len(&session->transmit); +} + +static int cmtp_session(void *arg) +{ + struct cmtp_session *session = arg; + struct sock *sk = session->sock->sk; + struct sk_buff *skb; + wait_queue_t wait; + + BT_DBG("session %p", session); + + daemonize("kcmtpd_ctr_%d", session->num); + set_user_nice(current, -15); + current->flags |= PF_NOFREEZE; + + init_waitqueue_entry(&wait, current); + add_wait_queue(sk->sk_sleep, &wait); + while (!atomic_read(&session->terminate)) { + set_current_state(TASK_INTERRUPTIBLE); + + if (sk->sk_state != BT_CONNECTED) + break; + + while ((skb = skb_dequeue(&sk->sk_receive_queue))) { + skb_orphan(skb); + cmtp_recv_frame(session, skb); + } + + cmtp_process_transmit(session); + + schedule(); + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk->sk_sleep, &wait); + + down_write(&cmtp_session_sem); + + if (!(session->flags & (1 << CMTP_LOOPBACK))) + cmtp_detach_device(session); + + fput(session->sock->file); + + __cmtp_unlink_session(session); + + up_write(&cmtp_session_sem); + + kfree(session); + return 0; +} + +int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) +{ + struct cmtp_session *session, *s; + bdaddr_t src, dst; + int i, err; + + BT_DBG(""); + + baswap(&src, &bt_sk(sock->sk)->src); + baswap(&dst, &bt_sk(sock->sk)->dst); + + session = kmalloc(sizeof(struct cmtp_session), GFP_KERNEL); + if (!session) + return -ENOMEM; + memset(session, 0, sizeof(struct cmtp_session)); + + down_write(&cmtp_session_sem); + + s = __cmtp_get_session(&bt_sk(sock->sk)->dst); + if (s && s->state == BT_CONNECTED) { + err = -EEXIST; + goto failed; + } + + bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst); + + session->mtu = min_t(uint, l2cap_pi(sock->sk)->omtu, l2cap_pi(sock->sk)->imtu); + + BT_DBG("mtu %d", session->mtu); + + sprintf(session->name, "%s", batostr(&dst)); + + session->sock = sock; + session->state = BT_CONFIG; + + init_waitqueue_head(&session->wait); + + session->msgnum = CMTP_INITIAL_MSGNUM; + + INIT_LIST_HEAD(&session->applications); + + skb_queue_head_init(&session->transmit); + + for (i = 0; i < 16; i++) + session->reassembly[i] = NULL; + + session->flags = req->flags; + + __cmtp_link_session(session); + + err = kernel_thread(cmtp_session, session, CLONE_KERNEL); + if (err < 0) + goto unlink; + + if (!(session->flags & (1 << CMTP_LOOPBACK))) { + err = cmtp_attach_device(session); + if (err < 0) + goto detach; + } + + up_write(&cmtp_session_sem); + return 0; + +detach: + cmtp_detach_device(session); + +unlink: + __cmtp_unlink_session(session); + +failed: + up_write(&cmtp_session_sem); + kfree(session); + return err; +} + +int cmtp_del_connection(struct cmtp_conndel_req *req) +{ + struct cmtp_session *session; + int err = 0; + + BT_DBG(""); + + down_read(&cmtp_session_sem); + + session = __cmtp_get_session(&req->bdaddr); + if (session) { + /* Flush the transmit queue */ + skb_queue_purge(&session->transmit); + + /* Kill session thread */ + atomic_inc(&session->terminate); + cmtp_schedule(session); + } else + err = -ENOENT; + + up_read(&cmtp_session_sem); + return err; +} + +int cmtp_get_connlist(struct cmtp_connlist_req *req) +{ + struct list_head *p; + int err = 0, n = 0; + + BT_DBG(""); + + down_read(&cmtp_session_sem); + + list_for_each(p, &cmtp_session_list) { + struct cmtp_session *session; + struct cmtp_conninfo ci; + + session = list_entry(p, struct cmtp_session, list); + + __cmtp_copy_session(session, &ci); + + if (copy_to_user(req->ci, &ci, sizeof(ci))) { + err = -EFAULT; + break; + } + + if (++n >= req->cnum) + break; + + req->ci++; + } + req->cnum = n; + + up_read(&cmtp_session_sem); + return err; +} + +int cmtp_get_conninfo(struct cmtp_conninfo *ci) +{ + struct cmtp_session *session; + int err = 0; + + down_read(&cmtp_session_sem); + + session = __cmtp_get_session(&ci->bdaddr); + if (session) + __cmtp_copy_session(session, ci); + else + err = -ENOENT; + + up_read(&cmtp_session_sem); + return err; +} + + +static int __init cmtp_init(void) +{ + l2cap_load(); + + BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); + + cmtp_init_sockets(); + + return 0; +} + +static void __exit cmtp_exit(void) +{ + cmtp_cleanup_sockets(); +} + +module_init(cmtp_init); +module_exit(cmtp_exit); + +MODULE_AUTHOR("Marcel Holtmann "); +MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("bt-proto-5"); -- cgit v1.2.3