diff options
author | Hiren Tandel <hirent@marvell.com> | 2014-05-05 10:43:31 (GMT) |
---|---|---|
committer | Samuel Ortiz <sameo@linux.intel.com> | 2014-05-19 22:06:04 (GMT) |
commit | 57be1f3f3ec1ccab6432615ca161c4c9ece2a2aa (patch) | |
tree | bb0021acf67dcb66957f0482cb89f894d8fa77f0 /net/nfc/rawsock.c | |
parent | c79d9f9ef86683824c195b093106222ff0611c10 (diff) | |
download | linux-57be1f3f3ec1ccab6432615ca161c4c9ece2a2aa.tar.xz |
NFC: Add RAW socket type support for SOCKPROTO_RAW
This allows for a more generic NFC sniffing by using SOCKPROTO_RAW
SOCK_RAW to read RAW NFC frames. This is for sniffing anything but LLCP
(HCI, NCI, etc...).
Signed-off-by: Hiren Tandel <hirent@marvell.com>
Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc/rawsock.c')
-rw-r--r-- | net/nfc/rawsock.c | 94 |
1 files changed, 89 insertions, 5 deletions
diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c index c27a6e8..8627c75 100644 --- a/net/nfc/rawsock.c +++ b/net/nfc/rawsock.c @@ -27,6 +27,24 @@ #include "nfc.h" +static struct nfc_sock_list raw_sk_list = { + .lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock) +}; + +void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk) +{ + write_lock(&l->lock); + sk_add_node(sk, &l->head); + write_unlock(&l->lock); +} + +void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk) +{ + write_lock(&l->lock); + sk_del_node_init(sk); + write_unlock(&l->lock); +} + static void rawsock_write_queue_purge(struct sock *sk) { pr_debug("sk=%p\n", sk); @@ -57,6 +75,9 @@ static int rawsock_release(struct socket *sock) if (!sk) return 0; + if (sock->type == SOCK_RAW) + nfc_sock_unlink(&raw_sk_list, sk); + sock_orphan(sk); sock_put(sk); @@ -275,6 +296,26 @@ static const struct proto_ops rawsock_ops = { .mmap = sock_no_mmap, }; +static const struct proto_ops rawsock_raw_ops = { + .family = PF_NFC, + .owner = THIS_MODULE, + .release = rawsock_release, + .bind = sock_no_bind, + .connect = sock_no_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = sock_no_getname, + .poll = datagram_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 = rawsock_recvmsg, + .mmap = sock_no_mmap, +}; + static void rawsock_destruct(struct sock *sk) { pr_debug("sk=%p\n", sk); @@ -300,10 +341,13 @@ static int rawsock_create(struct net *net, struct socket *sock, pr_debug("sock=%p\n", sock); - if (sock->type != SOCK_SEQPACKET) + if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW)) return -ESOCKTNOSUPPORT; - sock->ops = &rawsock_ops; + if (sock->type == SOCK_RAW) + sock->ops = &rawsock_raw_ops; + else + sock->ops = &rawsock_ops; sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto); if (!sk) @@ -313,13 +357,53 @@ static int rawsock_create(struct net *net, struct socket *sock, sk->sk_protocol = nfc_proto->id; sk->sk_destruct = rawsock_destruct; sock->state = SS_UNCONNECTED; - - INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); - nfc_rawsock(sk)->tx_work_scheduled = false; + if (sock->type == SOCK_RAW) + nfc_sock_link(&raw_sk_list, sk); + else { + INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); + nfc_rawsock(sk)->tx_work_scheduled = false; + } return 0; } +void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb, + u8 payload_type, u8 direction) +{ + struct sk_buff *skb_copy = NULL, *nskb; + struct sock *sk; + u8 *data; + + read_lock(&raw_sk_list.lock); + + sk_for_each(sk, &raw_sk_list.head) { + if (!skb_copy) { + skb_copy = __pskb_copy(skb, NFC_RAW_HEADER_SIZE, + GFP_ATOMIC); + if (!skb_copy) + continue; + + data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); + + data[0] = dev ? dev->idx : 0xFF; + data[1] = direction & 0x01; + data[1] |= (payload_type << 1); + } + + nskb = skb_clone(skb_copy, GFP_ATOMIC); + if (!nskb) + continue; + + if (sock_queue_rcv_skb(sk, nskb)) + kfree_skb(nskb); + } + + read_unlock(&raw_sk_list.lock); + + kfree_skb(skb_copy); +} +EXPORT_SYMBOL(nfc_send_to_raw_sock); + static struct proto rawsock_proto = { .name = "NFC_RAW", .owner = THIS_MODULE, |