NFC: LLCP socket sendmsg implemetation

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 62 insertions, 1 deletions

diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c
index 151f2ef429c4..f6c2257c11aa 100644
--- a/net/nfc/llcp/commands.c
+++ b/net/nfc/llcp/commands.c
@@ -397,3 +397,34 @@ int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
 
         return 0;
 }
+
+int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
+                                struct msghdr *msg, size_t len)
+{
+        struct sk_buff *pdu;
+        struct sock *sk;
+
+        pr_debug("Send I frame\n");
+
+        pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, len + LLCP_SEQUENCE_SIZE);
+        if (pdu == NULL)
+                return -ENOMEM;
+
+        skb_put(pdu, LLCP_SEQUENCE_SIZE);
+
+        if (memcpy_fromiovec(skb_put(pdu, len), msg->msg_iov, len)) {
+                kfree_skb(pdu);
+                return -EFAULT;
+        }
+
+        skb_queue_head(&sock->tx_queue, pdu);
+
+        sk = &sock->sk;
+        lock_sock(sk);
+
+        nfc_llcp_queue_i_frames(sock);
+
+        release_sock(sk);
+
+        return 0;
+}
diff --git a/net/nfc/llcp/llcp.h b/net/nfc/llcp/llcp.h
index 0a72ee627641..36d8572c8beb 100644
--- a/net/nfc/llcp/llcp.h
+++ b/net/nfc/llcp/llcp.h
@@ -188,6 +188,8 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
+int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
+                                struct msghdr *msg, size_t len);
 
 /* Socket API */
 int __init nfc_llcp_sock_init(void);
diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c
index f738ccd535f1..b8bef367ee49 100644
--- a/net/nfc/llcp/sock.c
+++ b/net/nfc/llcp/sock.c
@@ -482,6 +482,34 @@ error:
         return ret;
 }
 
+static int llcp_sock_sendmsg(struct kiocb *iocb, 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_state != LLCP_CONNECTED) {
+                release_sock(sk);
+                return -ENOTCONN;
+        }
+
+        release_sock(sk);
+
+        return nfc_llcp_send_i_frame(llcp_sock, msg, len);
+}
+
 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
                              struct msghdr *msg, size_t len, int flags)
 {
@@ -567,7 +595,7 @@ static const struct proto_ops llcp_sock_ops = {
         .shutdown       = sock_no_shutdown,
         .setsockopt     = sock_no_setsockopt,
         .getsockopt     = sock_no_getsockopt,
-        .sendmsg        = sock_no_sendmsg,
+        .sendmsg        = llcp_sock_sendmsg,
         .recvmsg        = llcp_sock_recvmsg,
         .mmap           = sock_no_mmap,
 };