cregit-Linux how code gets into the kernel

Release 4.8 net/nfc/llcp_sock.c

Directory: net/nfc
/*
 * 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 "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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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); }

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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); }

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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; }

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static int llcp_sock_accept(struct socket *sock, struct socket *newsock, int flags) { 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; }

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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; }

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americo wangamerico wang2813.21%120.00%
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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; }

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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; }

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Total197100.00%6100.00%


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; }

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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