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- /*
- 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/kthread.h>
- #include <linux/file.h>
- #include <linux/etherdevice.h>
- #include <asm/unaligned.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/l2cap.h>
- #include <net/bluetooth/hci_core.h>
- #include "bnep.h"
- #define VERSION "1.3"
- static bool compress_src = true;
- static bool compress_dst = true;
- 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;
- BT_DBG("");
- list_for_each_entry(s, &bnep_session_list, list)
- if (ether_addr_equal(dst, s->eh.h_source))
- return s;
- return NULL;
- }
- static void __bnep_link_session(struct bnep_session *s)
- {
- list_add(&s->list, &bnep_session_list);
- }
- static void __bnep_unlink_session(struct bnep_session *s)
- {
- list_del(&s->list);
- }
- 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) {
- int i;
- 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 %pMR -> %pMR", a1, a2);
- /* 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) {
- /* Increment a1 */
- i = 5;
- while (i >= 0 && ++a1[i--] == 0)
- ;
- 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:
- /* Successful response should be sent only once */
- if (test_bit(BNEP_SETUP_RESPONSE, &s->flags) &&
- !test_and_set_bit(BNEP_SETUP_RSP_SENT, &s->flags))
- err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP,
- BNEP_SUCCESS);
- else
- 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;
- err = 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 */
- };
- static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
- {
- struct net_device *dev = s->dev;
- struct sk_buff *nskb;
- u8 type, ctrl_type;
- dev->stats.rx_bytes += skb->len;
- type = *(u8 *) skb->data;
- skb_pull(skb, 1);
- ctrl_type = *(u8 *)skb->data;
- if ((type & BNEP_TYPE_MASK) >= sizeof(__bnep_rx_hlen))
- goto badframe;
- if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
- if (bnep_rx_control(s, skb->data, skb->len) < 0) {
- dev->stats.tx_errors++;
- kfree_skb(skb);
- return 0;
- }
- if (!(type & BNEP_EXT_HEADER)) {
- kfree_skb(skb);
- return 0;
- }
- /* Verify and pull ctrl message since it's already processed */
- switch (ctrl_type) {
- case BNEP_SETUP_CONN_REQ:
- /* Pull: ctrl type (1 b), len (1 b), data (len bytes) */
- if (!skb_pull(skb, 2 + *(u8 *)(skb->data + 1) * 2))
- goto badframe;
- break;
- case BNEP_FILTER_MULTI_ADDR_SET:
- case BNEP_FILTER_NET_TYPE_SET:
- /* Pull: ctrl type (1 b), len (2 b), data (len bytes) */
- if (!skb_pull(skb, 3 + *(u16 *)(skb->data + 1) * 2))
- goto badframe;
- break;
- default:
- kfree_skb(skb);
- return 0;
- }
- } else {
- 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) == ETH_P_8021Q) {
- 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 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 && ether_addr_equal(eh->h_dest, s->eh.h_source))
- type |= 0x01;
- if (compress_dst && ether_addr_equal(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;
- DEFINE_WAIT_FUNC(wait, woken_wake_function);
- BT_DBG("");
- set_user_nice(current, -15);
- add_wait_queue(sk_sleep(sk), &wait);
- while (1) {
- /* Ensure session->terminate is updated */
- smp_mb__before_atomic();
- if (atomic_read(&s->terminate))
- break;
- /* RX */
- while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
- skb_orphan(skb);
- if (!skb_linearize(skb))
- bnep_rx_frame(s, skb);
- else
- kfree_skb(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);
- wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
- }
- 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);
- module_put_and_exit(0);
- return 0;
- }
- static struct device *bnep_get_device(struct bnep_session *session)
- {
- struct l2cap_conn *conn = l2cap_pi(session->sock->sk)->chan->conn;
- if (!conn || !conn->hcon)
- return NULL;
- return &conn->hcon->dev;
- }
- static struct device_type bnep_type = {
- .name = "bluetooth",
- };
- int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
- {
- u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
- struct net_device *dev;
- struct bnep_session *s, *ss;
- u8 dst[ETH_ALEN], src[ETH_ALEN];
- int err;
- BT_DBG("");
- if (!l2cap_is_socket(sock))
- return -EBADFD;
- if (req->flags & ~valid_flags)
- return -EINVAL;
- baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
- baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);
- /* session struct allocated as private part of net_device */
- dev = alloc_netdev(sizeof(struct bnep_session),
- (*req->device) ? req->device : "bnep%d",
- NET_NAME_UNKNOWN,
- 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->flags = req->flags;
- 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);
- __module_get(THIS_MODULE);
- s->task = kthread_run(bnep_session, s, "kbnepd %s", dev->name);
- if (IS_ERR(s->task)) {
- /* Session thread start failed, gotta cleanup. */
- module_put(THIS_MODULE);
- unregister_netdev(dev);
- __bnep_unlink_session(s);
- err = PTR_ERR(s->task);
- 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)
- {
- u32 valid_flags = 0;
- struct bnep_session *s;
- int err = 0;
- BT_DBG("");
- if (req->flags & ~valid_flags)
- return -EINVAL;
- down_read(&bnep_session_sem);
- s = __bnep_get_session(req->dst);
- if (s) {
- atomic_inc(&s->terminate);
- 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)
- {
- u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
- memset(ci, 0, sizeof(*ci));
- memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
- strcpy(ci->device, s->dev->name);
- ci->flags = s->flags & valid_flags;
- ci->state = s->state;
- ci->role = s->role;
- }
- int bnep_get_connlist(struct bnep_connlist_req *req)
- {
- struct bnep_session *s;
- int err = 0, n = 0;
- down_read(&bnep_session_sem);
- list_for_each_entry(s, &bnep_session_list, list) {
- struct bnep_conninfo ci;
- __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] = "";
- #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");
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