diff options
Diffstat (limited to 'net/bluetooth/bnep/core.c')
| -rw-r--r-- | net/bluetooth/bnep/core.c | 746 |
1 files changed, 746 insertions, 0 deletions
diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c new file mode 100644 index 00000000..f10b41fb --- /dev/null +++ b/net/bluetooth/bnep/core.c @@ -0,0 +1,746 @@ +/* + BNEP implementation for Linux Bluetooth stack (BlueZ). + Copyright (C) 2001-2002 Inventel Systemes + Written 2001-2002 by + Clément Moreau <clement.moreau@inventel.fr> + David Libault <david.libault@inventel.fr> + + Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> + + 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 <linux/module.h> + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/signal.h> +#include <linux/init.h> +#include <linux/wait.h> +#include <linux/freezer.h> +#include <linux/errno.h> +#include <linux/net.h> +#include <linux/slab.h> +#include <net/sock.h> + +#include <linux/socket.h> +#include <linux/file.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +#include <asm/unaligned.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/l2cap.h> + +#include "bnep.h" + +#define VERSION "1.3" + +static int compress_src = 1; +static int compress_dst = 1; + +static LIST_HEAD(bnep_session_list); +static DECLARE_RWSEM(bnep_session_sem); + +static struct bnep_session *__bnep_get_session(u8 *dst) +{ + struct bnep_session *s; + struct list_head *p; + + BT_DBG(""); + + list_for_each(p, &bnep_session_list) { + s = list_entry(p, struct bnep_session, list); + if (!compare_ether_addr(dst, s->eh.h_source)) + return s; + } + return NULL; +} + +static void __bnep_link_session(struct bnep_session *s) +{ + /* It's safe to call __module_get() here because sessions are added + by the socket layer which has to hold the reference to this module. + */ + __module_get(THIS_MODULE); + list_add(&s->list, &bnep_session_list); +} + +static void __bnep_unlink_session(struct bnep_session *s) +{ + list_del(&s->list); + module_put(THIS_MODULE); +} + +static int bnep_send(struct bnep_session *s, void *data, size_t len) +{ + struct socket *sock = s->sock; + struct kvec iv = { data, len }; + + return kernel_sendmsg(sock, &s->msg, &iv, 1, len); +} + +static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp) +{ + struct bnep_control_rsp rsp; + rsp.type = BNEP_CONTROL; + rsp.ctrl = ctrl; + rsp.resp = htons(resp); + return bnep_send(s, &rsp, sizeof(rsp)); +} + +#ifdef CONFIG_BT_BNEP_PROTO_FILTER +static inline void bnep_set_default_proto_filter(struct bnep_session *s) +{ + /* (IPv4, ARP) */ + s->proto_filter[0].start = ETH_P_IP; + s->proto_filter[0].end = ETH_P_ARP; + /* (RARP, AppleTalk) */ + s->proto_filter[1].start = ETH_P_RARP; + s->proto_filter[1].end = ETH_P_AARP; + /* (IPX, IPv6) */ + s->proto_filter[2].start = ETH_P_IPX; + s->proto_filter[2].end = ETH_P_IPV6; +} +#endif + +static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len) +{ + int n; + + if (len < 2) + return -EILSEQ; + + n = get_unaligned_be16(data); + data++; len -= 2; + + if (len < n) + return -EILSEQ; + + BT_DBG("filter len %d", n); + +#ifdef CONFIG_BT_BNEP_PROTO_FILTER + n /= 4; + if (n <= BNEP_MAX_PROTO_FILTERS) { + struct bnep_proto_filter *f = s->proto_filter; + int i; + + for (i = 0; i < n; i++) { + f[i].start = get_unaligned_be16(data++); + f[i].end = get_unaligned_be16(data++); + + BT_DBG("proto filter start %d end %d", + f[i].start, f[i].end); + } + + if (i < BNEP_MAX_PROTO_FILTERS) + memset(f + i, 0, sizeof(*f)); + + if (n == 0) + bnep_set_default_proto_filter(s); + + bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS); + } else { + bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED); + } +#else + bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ); +#endif + return 0; +} + +static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len) +{ + int n; + + if (len < 2) + return -EILSEQ; + + n = get_unaligned_be16(data); + data += 2; len -= 2; + + if (len < n) + return -EILSEQ; + + BT_DBG("filter len %d", n); + +#ifdef CONFIG_BT_BNEP_MC_FILTER + n /= (ETH_ALEN * 2); + + if (n > 0) { + s->mc_filter = 0; + + /* Always send broadcast */ + set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter); + + /* Add address ranges to the multicast hash */ + for (; n > 0; n--) { + u8 a1[6], *a2; + + memcpy(a1, data, ETH_ALEN); data += ETH_ALEN; + a2 = data; data += ETH_ALEN; + + BT_DBG("mc filter %s -> %s", + batostr((void *) a1), batostr((void *) a2)); + + #define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); } + + /* Iterate from a1 to a2 */ + set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter); + while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) { + INCA(a1); + set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter); + } + } + } + + BT_DBG("mc filter hash 0x%llx", s->mc_filter); + + bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS); +#else + bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ); +#endif + return 0; +} + +static int bnep_rx_control(struct bnep_session *s, void *data, int len) +{ + u8 cmd = *(u8 *)data; + int err = 0; + + data++; len--; + + switch (cmd) { + case BNEP_CMD_NOT_UNDERSTOOD: + case BNEP_SETUP_CONN_RSP: + case BNEP_FILTER_NET_TYPE_RSP: + case BNEP_FILTER_MULTI_ADDR_RSP: + /* Ignore these for now */ + break; + + case BNEP_FILTER_NET_TYPE_SET: + err = bnep_ctrl_set_netfilter(s, data, len); + break; + + case BNEP_FILTER_MULTI_ADDR_SET: + err = bnep_ctrl_set_mcfilter(s, data, len); + break; + + case BNEP_SETUP_CONN_REQ: + err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP, BNEP_CONN_NOT_ALLOWED); + break; + + default: { + u8 pkt[3]; + pkt[0] = BNEP_CONTROL; + pkt[1] = BNEP_CMD_NOT_UNDERSTOOD; + pkt[2] = cmd; + bnep_send(s, pkt, sizeof(pkt)); + } + break; + } + + return err; +} + +static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb) +{ + struct bnep_ext_hdr *h; + int err = 0; + + do { + h = (void *) skb->data; + if (!skb_pull(skb, sizeof(*h))) { + err = -EILSEQ; + break; + } + + BT_DBG("type 0x%x len %d", h->type, h->len); + + switch (h->type & BNEP_TYPE_MASK) { + case BNEP_EXT_CONTROL: + bnep_rx_control(s, skb->data, skb->len); + break; + + default: + /* Unknown extension, skip it. */ + break; + } + + if (!skb_pull(skb, h->len)) { + err = -EILSEQ; + break; + } + } while (!err && (h->type & BNEP_EXT_HEADER)); + + return err; +} + +static u8 __bnep_rx_hlen[] = { + ETH_HLEN, /* BNEP_GENERAL */ + 0, /* BNEP_CONTROL */ + 2, /* BNEP_COMPRESSED */ + ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */ + ETH_ALEN + 2 /* BNEP_COMPRESSED_DST_ONLY */ +}; +#define BNEP_RX_TYPES (sizeof(__bnep_rx_hlen) - 1) + +static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb) +{ + struct net_device *dev = s->dev; + struct sk_buff *nskb; + u8 type; + + dev->stats.rx_bytes += skb->len; + + type = *(u8 *) skb->data; skb_pull(skb, 1); + + if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES) + goto badframe; + + if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) { + bnep_rx_control(s, skb->data, skb->len); + kfree_skb(skb); + return 0; + } + + skb_reset_mac_header(skb); + + /* Verify and pull out header */ + if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK])) + goto badframe; + + s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2)); + + if (type & BNEP_EXT_HEADER) { + if (bnep_rx_extension(s, skb) < 0) + goto badframe; + } + + /* Strip 802.1p header */ + if (ntohs(s->eh.h_proto) == 0x8100) { + if (!skb_pull(skb, 4)) + goto badframe; + s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2)); + } + + /* We have to alloc new skb and copy data here :(. Because original skb + * may not be modified and because of the alignment requirements. */ + nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL); + if (!nskb) { + dev->stats.rx_dropped++; + kfree_skb(skb); + return -ENOMEM; + } + skb_reserve(nskb, 2); + + /* Decompress header and construct ether frame */ + switch (type & BNEP_TYPE_MASK) { + case BNEP_COMPRESSED: + memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN); + break; + + case BNEP_COMPRESSED_SRC_ONLY: + memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN); + memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN); + put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2)); + break; + + case BNEP_COMPRESSED_DST_ONLY: + memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), + ETH_ALEN); + memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source, + ETH_ALEN + 2); + break; + + case BNEP_GENERAL: + memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb), + ETH_ALEN * 2); + put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2)); + break; + } + + skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len); + kfree_skb(skb); + + dev->stats.rx_packets++; + nskb->ip_summed = CHECKSUM_NONE; + nskb->protocol = eth_type_trans(nskb, dev); + netif_rx_ni(nskb); + return 0; + +badframe: + dev->stats.rx_errors++; + kfree_skb(skb); + return 0; +} + +static u8 __bnep_tx_types[] = { + BNEP_GENERAL, + BNEP_COMPRESSED_SRC_ONLY, + BNEP_COMPRESSED_DST_ONLY, + BNEP_COMPRESSED +}; + +static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb) +{ + struct ethhdr *eh = (void *) skb->data; + struct socket *sock = s->sock; + struct kvec iv[3]; + int len = 0, il = 0; + u8 type = 0; + + BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type); + + if (!skb->dev) { + /* Control frame sent by us */ + goto send; + } + + iv[il++] = (struct kvec) { &type, 1 }; + len++; + + if (compress_src && !compare_ether_addr(eh->h_dest, s->eh.h_source)) + type |= 0x01; + + if (compress_dst && !compare_ether_addr(eh->h_source, s->eh.h_dest)) + type |= 0x02; + + if (type) + skb_pull(skb, ETH_ALEN * 2); + + type = __bnep_tx_types[type]; + switch (type) { + case BNEP_COMPRESSED_SRC_ONLY: + iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN }; + len += ETH_ALEN; + break; + + case BNEP_COMPRESSED_DST_ONLY: + iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN }; + len += ETH_ALEN; + break; + } + +send: + iv[il++] = (struct kvec) { skb->data, skb->len }; + len += skb->len; + + /* FIXME: linearize skb */ + { + len = kernel_sendmsg(sock, &s->msg, iv, il, len); + } + kfree_skb(skb); + + if (len > 0) { + s->dev->stats.tx_bytes += len; + s->dev->stats.tx_packets++; + return 0; + } + + return len; +} + +static int bnep_session(void *arg) +{ + struct bnep_session *s = arg; + struct net_device *dev = s->dev; + struct sock *sk = s->sock->sk; + struct sk_buff *skb; + wait_queue_t wait; + + BT_DBG(""); + + daemonize("kbnepd %s", dev->name); + set_user_nice(current, -15); + + init_waitqueue_entry(&wait, current); + add_wait_queue(sk_sleep(sk), &wait); + while (!atomic_read(&s->killed)) { + set_current_state(TASK_INTERRUPTIBLE); + + // RX + while ((skb = skb_dequeue(&sk->sk_receive_queue))) { + skb_orphan(skb); + bnep_rx_frame(s, skb); + } + + if (sk->sk_state != BT_CONNECTED) + break; + + // TX + while ((skb = skb_dequeue(&sk->sk_write_queue))) + if (bnep_tx_frame(s, skb)) + break; + netif_wake_queue(dev); + + schedule(); + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + /* Cleanup session */ + down_write(&bnep_session_sem); + + /* Delete network device */ + unregister_netdev(dev); + + /* Wakeup user-space polling for socket errors */ + s->sock->sk->sk_err = EUNATCH; + + wake_up_interruptible(sk_sleep(s->sock->sk)); + + /* Release the socket */ + fput(s->sock->file); + + __bnep_unlink_session(s); + + up_write(&bnep_session_sem); + free_netdev(dev); + return 0; +} + +static struct device *bnep_get_device(struct bnep_session *session) +{ + bdaddr_t *src = &bt_sk(session->sock->sk)->src; + bdaddr_t *dst = &bt_sk(session->sock->sk)->dst; + struct hci_dev *hdev; + struct hci_conn *conn; + + hdev = hci_get_route(dst, src); + if (!hdev) + return NULL; + + conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); + + hci_dev_put(hdev); + + return conn ? &conn->dev : NULL; +} + +static struct device_type bnep_type = { + .name = "bluetooth", +}; + +int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock) +{ + struct net_device *dev; + struct bnep_session *s, *ss; + u8 dst[ETH_ALEN], src[ETH_ALEN]; + int err; + + BT_DBG(""); + + baswap((void *) dst, &bt_sk(sock->sk)->dst); + baswap((void *) src, &bt_sk(sock->sk)->src); + + /* session struct allocated as private part of net_device */ + dev = alloc_netdev(sizeof(struct bnep_session), + (*req->device) ? req->device : "bnep%d", + bnep_net_setup); + if (!dev) + return -ENOMEM; + + down_write(&bnep_session_sem); + + ss = __bnep_get_session(dst); + if (ss && ss->state == BT_CONNECTED) { + err = -EEXIST; + goto failed; + } + + s = netdev_priv(dev); + + /* This is rx header therefore addresses are swapped. + * ie eh.h_dest is our local address. */ + memcpy(s->eh.h_dest, &src, ETH_ALEN); + memcpy(s->eh.h_source, &dst, ETH_ALEN); + memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN); + + s->dev = dev; + s->sock = sock; + s->role = req->role; + s->state = BT_CONNECTED; + + s->msg.msg_flags = MSG_NOSIGNAL; + +#ifdef CONFIG_BT_BNEP_MC_FILTER + /* Set default mc filter */ + set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter); +#endif + +#ifdef CONFIG_BT_BNEP_PROTO_FILTER + /* Set default protocol filter */ + bnep_set_default_proto_filter(s); +#endif + + SET_NETDEV_DEV(dev, bnep_get_device(s)); + SET_NETDEV_DEVTYPE(dev, &bnep_type); + + err = register_netdev(dev); + if (err) { + goto failed; + } + + __bnep_link_session(s); + + err = kernel_thread(bnep_session, s, CLONE_KERNEL); + if (err < 0) { + /* Session thread start failed, gotta cleanup. */ + unregister_netdev(dev); + __bnep_unlink_session(s); + goto failed; + } + + up_write(&bnep_session_sem); + strcpy(req->device, dev->name); + return 0; + +failed: + up_write(&bnep_session_sem); + free_netdev(dev); + return err; +} + +int bnep_del_connection(struct bnep_conndel_req *req) +{ + struct bnep_session *s; + int err = 0; + + BT_DBG(""); + + down_read(&bnep_session_sem); + + s = __bnep_get_session(req->dst); + if (s) { + /* Wakeup user-space which is polling for socket errors. + * This is temporary hack until we have shutdown in L2CAP */ + s->sock->sk->sk_err = EUNATCH; + + /* Kill session thread */ + atomic_inc(&s->killed); + wake_up_interruptible(sk_sleep(s->sock->sk)); + } else + err = -ENOENT; + + up_read(&bnep_session_sem); + return err; +} + +static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s) +{ + memcpy(ci->dst, s->eh.h_source, ETH_ALEN); + strcpy(ci->device, s->dev->name); + ci->flags = s->flags; + ci->state = s->state; + ci->role = s->role; +} + +int bnep_get_connlist(struct bnep_connlist_req *req) +{ + struct list_head *p; + int err = 0, n = 0; + + down_read(&bnep_session_sem); + + list_for_each(p, &bnep_session_list) { + struct bnep_session *s; + struct bnep_conninfo ci; + + s = list_entry(p, struct bnep_session, list); + + __bnep_copy_ci(&ci, s); + + if (copy_to_user(req->ci, &ci, sizeof(ci))) { + err = -EFAULT; + break; + } + + if (++n >= req->cnum) + break; + + req->ci++; + } + req->cnum = n; + + up_read(&bnep_session_sem); + return err; +} + +int bnep_get_conninfo(struct bnep_conninfo *ci) +{ + struct bnep_session *s; + int err = 0; + + down_read(&bnep_session_sem); + + s = __bnep_get_session(ci->dst); + if (s) + __bnep_copy_ci(ci, s); + else + err = -ENOENT; + + up_read(&bnep_session_sem); + return err; +} + +static int __init bnep_init(void) +{ + char flt[50] = ""; + + l2cap_load(); + +#ifdef CONFIG_BT_BNEP_PROTO_FILTER + strcat(flt, "protocol "); +#endif + +#ifdef CONFIG_BT_BNEP_MC_FILTER + strcat(flt, "multicast"); +#endif + + BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION); + if (flt[0]) + BT_INFO("BNEP filters: %s", flt); + + bnep_sock_init(); + return 0; +} + +static void __exit bnep_exit(void) +{ + bnep_sock_cleanup(); +} + +module_init(bnep_init); +module_exit(bnep_exit); + +module_param(compress_src, bool, 0644); +MODULE_PARM_DESC(compress_src, "Compress sources headers"); + +module_param(compress_dst, bool, 0644); +MODULE_PARM_DESC(compress_dst, "Compress destination headers"); + +MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); +MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("bt-proto-4"); |