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NFC: LLCP raw socket support 

This adds support for socket of type SOCK_RAW to LLCP.
sk_buff are copied and sent to raw sockets with a 2 bytes extra header:
The first byte header contains the nfc adapter index.
The second one contains flags:
- 0x01 - Direction (0=RX, 1=TX)
- 0x02-0x80 - Reserved
A raw socket has to be explicitly bound to a nfc adapter. This is achieved
by specifying the adapter index to be bound to in the dev_idx field of the
sockaddr_nfc_llcp struct passed to bind().

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande 2012-09-26 18:16:44 +02:00 committed by Samuel Ortiz
parent ee5e8d812c
commit 4463523bef
5 changed files with 148 additions and 4 deletions
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11
include/linux/nfc.h
View File

@ -183,4 +183,15 @@ struct sockaddr_nfc_llcp {
#define NFC_HEADER_SIZE 1
/**
* Pseudo-header info for raw socket packets
* First byte is the adapter index
* Second byte contains flags
* - 0x01 - Direction (0=RX, 1=TX)
* - 0x02-0x80 - Reserved
**/
#define NFC_LLCP_RAW_HEADER_SIZE 2
#define NFC_LLCP_DIRECTION_RX 0x00
#define NFC_LLCP_DIRECTION_TX 0x01
#endif /*__LINUX_NFC_H */

2
net/nfc/llcp/commands.c
View File

@ -312,6 +312,8 @@ int nfc_llcp_send_symm(struct nfc_dev *dev)
skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX);
return nfc_data_exchange(dev, local->target_idx, skb,
nfc_llcp_recv, local);
}

46
net/nfc/llcp/llcp.c
View File

@ -558,6 +558,46 @@ static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
sock->recv_ack_n = (sock->recv_n - 1) % 16;
}
void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
struct sk_buff *skb, u8 direction)
{
struct hlist_node *node;
struct sk_buff *skb_copy = NULL, *nskb;
struct sock *sk;
u8 *data;
read_lock(&local->raw_sockets.lock);
sk_for_each(sk, node, &local->raw_sockets.head) {
if (sk->sk_state != LLCP_BOUND)
continue;
if (skb_copy == NULL) {
skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
GFP_ATOMIC);
if (skb_copy == NULL)
continue;
data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
data[0] = local->dev ? local->dev->idx : 0xFF;
data[1] = direction;
}
nskb = skb_clone(skb_copy, GFP_ATOMIC);
if (!nskb)
continue;
if (sock_queue_rcv_skb(sk, nskb))
kfree_skb(nskb);
}
read_unlock(&local->raw_sockets.lock);
kfree_skb(skb_copy);
}
static void nfc_llcp_tx_work(struct work_struct *work)
{
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
@ -578,6 +618,9 @@ static void nfc_llcp_tx_work(struct work_struct *work)
DUMP_PREFIX_OFFSET, 16, 1,
skb->data, skb->len, true);
nfc_llcp_send_to_raw_sock(local, skb,
NFC_LLCP_DIRECTION_TX);
ret = nfc_data_exchange(local->dev, local->target_idx,
skb, nfc_llcp_recv, local);
@ -1022,6 +1065,8 @@ static void nfc_llcp_rx_work(struct work_struct *work)
print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
16, 1, skb->data, skb->len, true);
nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
switch (ptype) {
case LLCP_PDU_SYMM:
pr_debug("SYMM\n");
@ -1158,6 +1203,7 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
rwlock_init(&local->sockets.lock);
rwlock_init(&local->connecting_sockets.lock);
rwlock_init(&local->raw_sockets.lock);
nfc_llcp_build_gb(local);

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

@ -86,6 +86,7 @@ struct nfc_llcp_local {
/* sockets array */
struct llcp_sock_list sockets;
struct llcp_sock_list connecting_sockets;
struct llcp_sock_list raw_sockets;
};
struct nfc_llcp_sock {
@ -184,6 +185,8 @@ u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock);
void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
struct sk_buff *skb, u8 direction);
/* Sock API */
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);

90
net/nfc/llcp/sock.c
View File

@ -142,6 +142,60 @@ error:
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;
@ -418,7 +472,10 @@ static int llcp_sock_release(struct socket *sock)
release_sock(sk);
nfc_llcp_sock_unlink(&local->sockets, sk);
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);
@ -614,7 +671,7 @@ static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
if (!(flags & MSG_PEEK)) {
/* SOCK_STREAM: re-queue skb if it contains unreceived data */
if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_RAW) {
skb_pull(skb, copied);
if (skb->len) {
skb_queue_head(&sk->sk_receive_queue, skb);
@ -655,6 +712,26 @@ static const struct proto_ops llcp_sock_ops = {
.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,
.recvmsg = llcp_sock_recvmsg,
.mmap = sock_no_mmap,
};
static void llcp_sock_destruct(struct sock *sk)
{
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
@ -732,10 +809,15 @@ static int llcp_sock_create(struct net *net, struct socket *sock,
pr_debug("%p\n", sock);
if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
if (sock->type != SOCK_STREAM &&
sock->type != SOCK_DGRAM &&
sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sock->ops = &llcp_sock_ops;
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);
if (sk == NULL)