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NFC: llcp: Implement socket options 

Some LLCP services (e.g. the validation ones) require some control over
the LLCP link parameters like the receive window (RW) or the MIU extension
(MIUX). This can only be done through socket options.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2013-02-22 10:53:25 +01:00
parent e4306bec47
commit 26fd76cab2
4 changed files with 125 additions and 2 deletions
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1
include/linux/socket.h
View File

@ -298,6 +298,7 @@ struct ucred {
#define SOL_IUCV 277
#define SOL_CAIF 278
#define SOL_ALG 279
#define SOL_NFC 280
/* IPX options */
#define IPX_TYPE 1

4
include/uapi/linux/nfc.h
View File

@ -220,4 +220,8 @@ struct sockaddr_nfc_llcp {
#define NFC_LLCP_DIRECTION_RX 0x00
#define NFC_LLCP_DIRECTION_TX 0x01
/* socket option names */
#define NFC_LLCP_RW 0
#define NFC_LLCP_MIUX 1
#endif /*__LINUX_NFC_H */

3
net/nfc/llcp/llcp.h
View File

@ -104,6 +104,9 @@ struct nfc_llcp_sock {
u8 dsap;
char *service_name;
size_t service_name_len;
u8 rw;
u16 miux;
/* Remote link parameters */
u8 remote_rw;

119
net/nfc/llcp/sock.c
View File

@ -223,6 +223,121 @@ error:
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 = (u16) opt;
break;
default:
err = -ENOPROTOOPT;
break;
}
release_sock(sk);
return err;
}
static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
int len, err = 0;
pr_debug("%p optname %d\n", sk, optname);
if (level != SOL_NFC)
return -ENOPROTOOPT;
if (get_user(len, optlen))
return -EFAULT;
len = min_t(u32, len, sizeof(u32));
lock_sock(sk);
switch (optname) {
case NFC_LLCP_RW:
if (put_user(llcp_sock->rw, (u32 __user *) optval))
err = -EFAULT;
break;
case NFC_LLCP_MIUX:
if (put_user(llcp_sock->miux, (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);
@ -735,8 +850,8 @@ static const struct proto_ops llcp_sock_ops = {
.ioctl = sock_no_ioctl,
.listen = llcp_sock_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.setsockopt = nfc_llcp_setsockopt,
.getsockopt = nfc_llcp_getsockopt,
.sendmsg = llcp_sock_sendmsg,
.recvmsg = llcp_sock_recvmsg,
.mmap = sock_no_mmap,