diff options
Diffstat (limited to 'net/nfc/llcp_sock.c')
| -rw-r--r-- | net/nfc/llcp_sock.c | 1066 |
1 files changed, 1066 insertions, 0 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c new file mode 100644 index 0000000..1ae0c0c --- /dev/null +++ b/net/nfc/llcp_sock.c @@ -0,0 +1,1066 @@ +/* + * Copyright (C) 2011 Intel Corporation. All rights reserved. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) "llcp: %s: " fmt, __func__ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/nfc.h> +#include <linux/sched/signal.h> + +#include "nfc.h" +#include "llcp.h" + +static int sock_wait_state(struct sock *sk, int state, unsigned long timeo) +{ + DECLARE_WAITQUEUE(wait, current); + int err = 0; + + pr_debug("sk %p", sk); + + add_wait_queue(sk_sleep(sk), &wait); + set_current_state(TASK_INTERRUPTIBLE); + + while (sk->sk_state != state) { + if (!timeo) { + err = -EINPROGRESS; + break; + } + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + set_current_state(TASK_INTERRUPTIBLE); + + err = sock_error(sk); + if (err) + break; + } + + __set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + return err; +} + +static struct proto llcp_sock_proto = { + .name = "NFC_LLCP", + .owner = THIS_MODULE, + .obj_size = sizeof(struct nfc_llcp_sock), +}; + +static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + struct nfc_llcp_local *local; + struct nfc_dev *dev; + struct sockaddr_nfc_llcp llcp_addr; + int len, ret = 0; + + if (!addr || addr->sa_family != AF_NFC) + return -EINVAL; + + pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); + + memset(&llcp_addr, 0, sizeof(llcp_addr)); + len = min_t(unsigned int, sizeof(llcp_addr), alen); + memcpy(&llcp_addr, addr, len); + + /* This is going to be a listening socket, dsap must be 0 */ + if (llcp_addr.dsap != 0) + return -EINVAL; + + lock_sock(sk); + + if (sk->sk_state != LLCP_CLOSED) { + ret = -EBADFD; + goto error; + } + + dev = nfc_get_device(llcp_addr.dev_idx); + if (dev == NULL) { + ret = -ENODEV; + goto error; + } + + local = nfc_llcp_find_local(dev); + if (local == NULL) { + ret = -ENODEV; + goto put_dev; + } + + llcp_sock->dev = dev; + llcp_sock->local = nfc_llcp_local_get(local); + llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; + llcp_sock->service_name_len = min_t(unsigned int, + llcp_addr.service_name_len, + NFC_LLCP_MAX_SERVICE_NAME); + llcp_sock->service_name = kmemdup(llcp_addr.service_name, + llcp_sock->service_name_len, + GFP_KERNEL); + + llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); + if (llcp_sock->ssap == LLCP_SAP_MAX) { + ret = -EADDRINUSE; + goto put_dev; + } + + llcp_sock->reserved_ssap = llcp_sock->ssap; + + nfc_llcp_sock_link(&local->sockets, sk); + + pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); + + sk->sk_state = LLCP_BOUND; + +put_dev: + nfc_put_device(dev); + +error: + release_sock(sk); + return ret; +} + +static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr, + int alen) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + struct nfc_llcp_local *local; + struct nfc_dev *dev; + struct sockaddr_nfc_llcp llcp_addr; + int len, ret = 0; + + if (!addr || addr->sa_family != AF_NFC) + return -EINVAL; + + pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); + + memset(&llcp_addr, 0, sizeof(llcp_addr)); + len = min_t(unsigned int, sizeof(llcp_addr), alen); + memcpy(&llcp_addr, addr, len); + + lock_sock(sk); + + if (sk->sk_state != LLCP_CLOSED) { + ret = -EBADFD; + goto error; + } + + dev = nfc_get_device(llcp_addr.dev_idx); + if (dev == NULL) { + ret = -ENODEV; + goto error; + } + + local = nfc_llcp_find_local(dev); + if (local == NULL) { + ret = -ENODEV; + goto put_dev; + } + + llcp_sock->dev = dev; + llcp_sock->local = nfc_llcp_local_get(local); + llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; + + nfc_llcp_sock_link(&local->raw_sockets, sk); + + sk->sk_state = LLCP_BOUND; + +put_dev: + nfc_put_device(dev); + +error: + release_sock(sk); + return ret; +} + +static int llcp_sock_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + int ret = 0; + + pr_debug("sk %p backlog %d\n", sk, backlog); + + lock_sock(sk); + + if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) || + sk->sk_state != LLCP_BOUND) { + ret = -EBADFD; + goto error; + } + + sk->sk_max_ack_backlog = backlog; + sk->sk_ack_backlog = 0; + + pr_debug("Socket listening\n"); + sk->sk_state = LLCP_LISTEN; + +error: + release_sock(sk); + + return ret; +} + +static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + u32 opt; + int err = 0; + + pr_debug("%p optname %d\n", sk, optname); + + if (level != SOL_NFC) + return -ENOPROTOOPT; + + lock_sock(sk); + + switch (optname) { + case NFC_LLCP_RW: + if (sk->sk_state == LLCP_CONNECTED || + sk->sk_state == LLCP_BOUND || + sk->sk_state == LLCP_LISTEN) { + err = -EINVAL; + break; + } + + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt > LLCP_MAX_RW) { + err = -EINVAL; + break; + } + + llcp_sock->rw = (u8) opt; + + break; + + case NFC_LLCP_MIUX: + if (sk->sk_state == LLCP_CONNECTED || + sk->sk_state == LLCP_BOUND || + sk->sk_state == LLCP_LISTEN) { + err = -EINVAL; + break; + } + + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt > LLCP_MAX_MIUX) { + err = -EINVAL; + break; + } + + llcp_sock->miux = cpu_to_be16((u16) opt); + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + + pr_debug("%p rw %d miux %d\n", llcp_sock, + llcp_sock->rw, llcp_sock->miux); + + return err; +} + +static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct nfc_llcp_local *local; + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + int len, err = 0; + u16 miux, remote_miu; + u8 rw; + + pr_debug("%p optname %d\n", sk, optname); + + if (level != SOL_NFC) + return -ENOPROTOOPT; + + if (get_user(len, optlen)) + return -EFAULT; + + local = llcp_sock->local; + if (!local) + return -ENODEV; + + len = min_t(u32, len, sizeof(u32)); + + lock_sock(sk); + + switch (optname) { + case NFC_LLCP_RW: + rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw; + if (put_user(rw, (u32 __user *) optval)) + err = -EFAULT; + + break; + + case NFC_LLCP_MIUX: + miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ? + be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux); + + if (put_user(miux, (u32 __user *) optval)) + err = -EFAULT; + + break; + + case NFC_LLCP_REMOTE_MIU: + remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ? + local->remote_miu : llcp_sock->remote_miu; + + if (put_user(remote_miu, (u32 __user *) optval)) + err = -EFAULT; + + break; + + case NFC_LLCP_REMOTE_LTO: + if (put_user(local->remote_lto / 10, (u32 __user *) optval)) + err = -EFAULT; + + break; + + case NFC_LLCP_REMOTE_RW: + if (put_user(llcp_sock->remote_rw, (u32 __user *) optval)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + + if (put_user(len, optlen)) + return -EFAULT; + + return err; +} + +void nfc_llcp_accept_unlink(struct sock *sk) +{ + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + + pr_debug("state %d\n", sk->sk_state); + + list_del_init(&llcp_sock->accept_queue); + sk_acceptq_removed(llcp_sock->parent); + llcp_sock->parent = NULL; + + sock_put(sk); +} + +void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) +{ + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); + + /* Lock will be free from unlink */ + sock_hold(sk); + + list_add_tail(&llcp_sock->accept_queue, + &llcp_sock_parent->accept_queue); + llcp_sock->parent = parent; + sk_acceptq_added(parent); +} + +struct sock *nfc_llcp_accept_dequeue(struct sock *parent, + struct socket *newsock) +{ + struct nfc_llcp_sock *lsk, *n, *llcp_parent; + struct sock *sk; + + llcp_parent = nfc_llcp_sock(parent); + + list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, + accept_queue) { + sk = &lsk->sk; + lock_sock(sk); + + if (sk->sk_state == LLCP_CLOSED) { + release_sock(sk); + nfc_llcp_accept_unlink(sk); + continue; + } + + if (sk->sk_state == LLCP_CONNECTED || !newsock) { + list_del_init(&lsk->accept_queue); + sock_put(sk); + + if (newsock) + sock_graft(sk, newsock); + + release_sock(sk); + + pr_debug("Returning sk state %d\n", sk->sk_state); + + sk_acceptq_removed(parent); + + return sk; + } + + release_sock(sk); + } + + return NULL; +} + +static int llcp_sock_accept(struct socket *sock, struct socket *newsock, + int flags, bool kern) +{ + DECLARE_WAITQUEUE(wait, current); + struct sock *sk = sock->sk, *new_sk; + long timeo; + int ret = 0; + + pr_debug("parent %p\n", sk); + + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_state != LLCP_LISTEN) { + ret = -EBADFD; + goto error; + } + + timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); + + /* Wait for an incoming connection. */ + add_wait_queue_exclusive(sk_sleep(sk), &wait); + while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { + set_current_state(TASK_INTERRUPTIBLE); + + if (!timeo) { + ret = -EAGAIN; + break; + } + + if (signal_pending(current)) { + ret = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + } + __set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + if (ret) + goto error; + + newsock->state = SS_CONNECTED; + + pr_debug("new socket %p\n", new_sk); + +error: + release_sock(sk); + + return ret; +} + +static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, + int *len, int peer) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); + + if (llcp_sock == NULL || llcp_sock->dev == NULL) + return -EBADFD; + + pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, + llcp_sock->dsap, llcp_sock->ssap); + + memset(llcp_addr, 0, sizeof(*llcp_addr)); + *len = sizeof(struct sockaddr_nfc_llcp); + + lock_sock(sk); + if (!llcp_sock->dev) { + release_sock(sk); + return -EBADFD; + } + llcp_addr->sa_family = AF_NFC; + llcp_addr->dev_idx = llcp_sock->dev->idx; + llcp_addr->target_idx = llcp_sock->target_idx; + llcp_addr->nfc_protocol = llcp_sock->nfc_protocol; + llcp_addr->dsap = llcp_sock->dsap; + llcp_addr->ssap = llcp_sock->ssap; + llcp_addr->service_name_len = llcp_sock->service_name_len; + memcpy(llcp_addr->service_name, llcp_sock->service_name, + llcp_addr->service_name_len); + release_sock(sk); + + return 0; +} + +static inline unsigned int llcp_accept_poll(struct sock *parent) +{ + struct nfc_llcp_sock *llcp_sock, *parent_sock; + struct sock *sk; + + parent_sock = nfc_llcp_sock(parent); + + list_for_each_entry(llcp_sock, &parent_sock->accept_queue, + accept_queue) { + sk = &llcp_sock->sk; + + if (sk->sk_state == LLCP_CONNECTED) + return POLLIN | POLLRDNORM; + } + + return 0; +} + +static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, + poll_table *wait) +{ + struct sock *sk = sock->sk; + unsigned int mask = 0; + + pr_debug("%p\n", sk); + + sock_poll_wait(file, sk_sleep(sk), wait); + + if (sk->sk_state == LLCP_LISTEN) + return llcp_accept_poll(sk); + + if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) + mask |= POLLERR | + (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); + + if (!skb_queue_empty(&sk->sk_receive_queue)) + mask |= POLLIN | POLLRDNORM; + + if (sk->sk_state == LLCP_CLOSED) + mask |= POLLHUP; + + if (sk->sk_shutdown & RCV_SHUTDOWN) + mask |= POLLRDHUP | POLLIN | POLLRDNORM; + + if (sk->sk_shutdown == SHUTDOWN_MASK) + mask |= POLLHUP; + + if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED) + mask |= POLLOUT | POLLWRNORM | POLLWRBAND; + else + sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); + + pr_debug("mask 0x%x\n", mask); + + return mask; +} + +static int llcp_sock_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_local *local; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + int err = 0; + + if (!sk) + return 0; + + pr_debug("%p\n", sk); + + local = llcp_sock->local; + if (local == NULL) { + err = -ENODEV; + goto out; + } + + lock_sock(sk); + + /* Send a DISC */ + if (sk->sk_state == LLCP_CONNECTED) + nfc_llcp_send_disconnect(llcp_sock); + + if (sk->sk_state == LLCP_LISTEN) { + struct nfc_llcp_sock *lsk, *n; + struct sock *accept_sk; + + list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, + accept_queue) { + accept_sk = &lsk->sk; + lock_sock(accept_sk); + + nfc_llcp_send_disconnect(lsk); + nfc_llcp_accept_unlink(accept_sk); + + release_sock(accept_sk); + } + } + + if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) + nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); + + release_sock(sk); + + /* Keep this sock alive and therefore do not remove it from the sockets + * list until the DISC PDU has been actually sent. Otherwise we would + * reply with DM PDUs before sending the DISC one. + */ + if (sk->sk_state == LLCP_DISCONNECTING) + return err; + + if (sock->type == SOCK_RAW) + nfc_llcp_sock_unlink(&local->raw_sockets, sk); + else + nfc_llcp_sock_unlink(&local->sockets, sk); + +out: + sock_orphan(sk); + sock_put(sk); + + return err; +} + +static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, + int len, int flags) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; + struct nfc_dev *dev; + struct nfc_llcp_local *local; + int ret = 0; + + pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); + + if (!addr || len < sizeof(struct sockaddr_nfc) || + addr->sa_family != AF_NFC) + return -EINVAL; + + if (addr->service_name_len == 0 && addr->dsap == 0) + return -EINVAL; + + pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, + addr->target_idx, addr->nfc_protocol); + + lock_sock(sk); + + if (sk->sk_state == LLCP_CONNECTED) { + ret = -EISCONN; + goto error; + } + + dev = nfc_get_device(addr->dev_idx); + if (dev == NULL) { + ret = -ENODEV; + goto error; + } + + local = nfc_llcp_find_local(dev); + if (local == NULL) { + ret = -ENODEV; + goto put_dev; + } + + device_lock(&dev->dev); + if (dev->dep_link_up == false) { + ret = -ENOLINK; + device_unlock(&dev->dev); + goto put_dev; + } + device_unlock(&dev->dev); + + if (local->rf_mode == NFC_RF_INITIATOR && + addr->target_idx != local->target_idx) { + ret = -ENOLINK; + goto put_dev; + } + + llcp_sock->dev = dev; + llcp_sock->local = nfc_llcp_local_get(local); + llcp_sock->ssap = nfc_llcp_get_local_ssap(local); + if (llcp_sock->ssap == LLCP_SAP_MAX) { + ret = -ENOMEM; + goto put_dev; + } + + llcp_sock->reserved_ssap = llcp_sock->ssap; + + if (addr->service_name_len == 0) + llcp_sock->dsap = addr->dsap; + else + llcp_sock->dsap = LLCP_SAP_SDP; + llcp_sock->nfc_protocol = addr->nfc_protocol; + llcp_sock->service_name_len = min_t(unsigned int, + addr->service_name_len, + NFC_LLCP_MAX_SERVICE_NAME); + llcp_sock->service_name = kmemdup(addr->service_name, + llcp_sock->service_name_len, + GFP_KERNEL); + + nfc_llcp_sock_link(&local->connecting_sockets, sk); + + ret = nfc_llcp_send_connect(llcp_sock); + if (ret) + goto sock_unlink; + + sk->sk_state = LLCP_CONNECTING; + + ret = sock_wait_state(sk, LLCP_CONNECTED, + sock_sndtimeo(sk, flags & O_NONBLOCK)); + if (ret && ret != -EINPROGRESS) + goto sock_unlink; + + release_sock(sk); + + return ret; + +sock_unlink: + nfc_llcp_put_ssap(local, llcp_sock->ssap); + + nfc_llcp_sock_unlink(&local->connecting_sockets, sk); + +put_dev: + nfc_put_device(dev); + +error: + release_sock(sk); + return ret; +} + +static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg, + size_t len) +{ + struct sock *sk = sock->sk; + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + int ret; + + pr_debug("sock %p sk %p", sock, sk); + + ret = sock_error(sk); + if (ret) + return ret; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + lock_sock(sk); + + if (sk->sk_type == SOCK_DGRAM) { + DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr, + msg->msg_name); + + if (msg->msg_namelen < sizeof(*addr)) { + release_sock(sk); + return -EINVAL; + } + + release_sock(sk); + + return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap, + msg, len); + } + + if (sk->sk_state != LLCP_CONNECTED) { + release_sock(sk); + return -ENOTCONN; + } + + release_sock(sk); + + return nfc_llcp_send_i_frame(llcp_sock, msg, len); +} +#if LINUX_VERSION_IS_LESS(4,1,0) +static int backport_llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t len){ + return llcp_sock_sendmsg(sock, msg, len); +} +#endif /* LINUX_VERSION_IS_LESS(4,1,0) */ + +static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg, + size_t len, int flags) +{ + int noblock = flags & MSG_DONTWAIT; + struct sock *sk = sock->sk; + unsigned int copied, rlen; + struct sk_buff *skb, *cskb; + int err = 0; + + pr_debug("%p %zu\n", sk, len); + + lock_sock(sk); + + if (sk->sk_state == LLCP_CLOSED && + skb_queue_empty(&sk->sk_receive_queue)) { + release_sock(sk); + return 0; + } + + release_sock(sk); + + if (flags & (MSG_OOB)) + return -EOPNOTSUPP; + + skb = skb_recv_datagram(sk, flags, noblock, &err); + if (!skb) { + pr_err("Recv datagram failed state %d %d %d", + sk->sk_state, err, sock_error(sk)); + + if (sk->sk_shutdown & RCV_SHUTDOWN) + return 0; + + return err; + } + + rlen = skb->len; /* real length of skb */ + copied = min_t(unsigned int, rlen, len); + + cskb = skb; + if (skb_copy_datagram_msg(cskb, 0, msg, copied)) { + if (!(flags & MSG_PEEK)) + skb_queue_head(&sk->sk_receive_queue, skb); + return -EFAULT; + } + + sock_recv_timestamp(msg, sk, skb); + + if (sk->sk_type == SOCK_DGRAM && msg->msg_name) { + struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb); + DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr, + msg->msg_name); + + msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp); + + pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); + + memset(sockaddr, 0, sizeof(*sockaddr)); + sockaddr->sa_family = AF_NFC; + sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; + sockaddr->dsap = ui_cb->dsap; + sockaddr->ssap = ui_cb->ssap; + } + + /* Mark read part of skb as used */ + if (!(flags & MSG_PEEK)) { + + /* SOCK_STREAM: re-queue skb if it contains unreceived data */ + if (sk->sk_type == SOCK_STREAM || + sk->sk_type == SOCK_DGRAM || + sk->sk_type == SOCK_RAW) { + skb_pull(skb, copied); + if (skb->len) { + skb_queue_head(&sk->sk_receive_queue, skb); + goto done; + } + } + + kfree_skb(skb); + } + + /* XXX Queue backlogged skbs */ + +done: + /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ + if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) + copied = rlen; + + return copied; +} +#if LINUX_VERSION_IS_LESS(4,1,0) +static int backport_llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t len, + int flags){ + return llcp_sock_recvmsg(sock, msg, len, flags); +} +#endif /* LINUX_VERSION_IS_LESS(4,1,0) */ + +static const struct proto_ops llcp_sock_ops = { + .family = PF_NFC, + .owner = THIS_MODULE, + .bind = llcp_sock_bind, + .connect = llcp_sock_connect, + .release = llcp_sock_release, + .socketpair = sock_no_socketpair, + .accept = llcp_sock_accept, + .getname = llcp_sock_getname, + .poll = llcp_sock_poll, + .ioctl = sock_no_ioctl, + .listen = llcp_sock_listen, + .shutdown = sock_no_shutdown, + .setsockopt = nfc_llcp_setsockopt, + .getsockopt = nfc_llcp_getsockopt, +#if LINUX_VERSION_IS_GEQ(4,1,0) + .sendmsg = llcp_sock_sendmsg, +#else + .sendmsg = backport_llcp_sock_sendmsg, +#endif /* LINUX_VERSION_IS_GEQ(4,1,0) */ +#if LINUX_VERSION_IS_GEQ(4,1,0) + .recvmsg = llcp_sock_recvmsg, +#else + .recvmsg = backport_llcp_sock_recvmsg, +#endif /* LINUX_VERSION_IS_GEQ(4,1,0) */ + .mmap = sock_no_mmap, +}; + +static const struct proto_ops llcp_rawsock_ops = { + .family = PF_NFC, + .owner = THIS_MODULE, + .bind = llcp_raw_sock_bind, + .connect = sock_no_connect, + .release = llcp_sock_release, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = llcp_sock_getname, + .poll = llcp_sock_poll, + .ioctl = sock_no_ioctl, + .listen = sock_no_listen, + .shutdown = sock_no_shutdown, + .setsockopt = sock_no_setsockopt, + .getsockopt = sock_no_getsockopt, + .sendmsg = sock_no_sendmsg, +#if LINUX_VERSION_IS_GEQ(4,1,0) + .recvmsg = llcp_sock_recvmsg, +#else + .recvmsg = backport_llcp_sock_recvmsg, +#endif /* LINUX_VERSION_IS_GEQ(4,1,0) */ + .mmap = sock_no_mmap, +}; + +static void llcp_sock_destruct(struct sock *sk) +{ + struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); + + pr_debug("%p\n", sk); + + if (sk->sk_state == LLCP_CONNECTED) + nfc_put_device(llcp_sock->dev); + + skb_queue_purge(&sk->sk_receive_queue); + + nfc_llcp_sock_free(llcp_sock); + + if (!sock_flag(sk, SOCK_DEAD)) { + pr_err("Freeing alive NFC LLCP socket %p\n", sk); + return; + } +} + +struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern) +{ + struct sock *sk; + struct nfc_llcp_sock *llcp_sock; + + sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern); + if (!sk) + return NULL; + + llcp_sock = nfc_llcp_sock(sk); + + sock_init_data(sock, sk); + sk->sk_state = LLCP_CLOSED; + sk->sk_protocol = NFC_SOCKPROTO_LLCP; + sk->sk_type = type; + sk->sk_destruct = llcp_sock_destruct; + + llcp_sock->ssap = 0; + llcp_sock->dsap = LLCP_SAP_SDP; + llcp_sock->rw = LLCP_MAX_RW + 1; + llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1); + llcp_sock->send_n = llcp_sock->send_ack_n = 0; + llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; + llcp_sock->remote_ready = 1; + llcp_sock->reserved_ssap = LLCP_SAP_MAX; + nfc_llcp_socket_remote_param_init(llcp_sock); + skb_queue_head_init(&llcp_sock->tx_queue); + skb_queue_head_init(&llcp_sock->tx_pending_queue); + INIT_LIST_HEAD(&llcp_sock->accept_queue); + + if (sock != NULL) + sock->state = SS_UNCONNECTED; + + return sk; +} + +void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) +{ + kfree(sock->service_name); + + skb_queue_purge(&sock->tx_queue); + skb_queue_purge(&sock->tx_pending_queue); + + list_del_init(&sock->accept_queue); + + sock->parent = NULL; + + nfc_llcp_local_put(sock->local); +} + +static int llcp_sock_create(struct net *net, struct socket *sock, + const struct nfc_protocol *nfc_proto, int kern) +{ + struct sock *sk; + + pr_debug("%p\n", sock); + + if (sock->type != SOCK_STREAM && + sock->type != SOCK_DGRAM && + sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + + if (sock->type == SOCK_RAW) + sock->ops = &llcp_rawsock_ops; + else + sock->ops = &llcp_sock_ops; + + sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern); + if (sk == NULL) + return -ENOMEM; + + return 0; +} + +static const struct nfc_protocol llcp_nfc_proto = { + .id = NFC_SOCKPROTO_LLCP, + .proto = &llcp_sock_proto, + .owner = THIS_MODULE, + .create = llcp_sock_create +}; + +int __init nfc_llcp_sock_init(void) +{ + return nfc_proto_register(&llcp_nfc_proto); +} + +void nfc_llcp_sock_exit(void) +{ + nfc_proto_unregister(&llcp_nfc_proto); +} |