diff options
Diffstat (limited to 'net/nfc/llcp/commands.c')
| -rw-r--r-- | net/nfc/llcp/commands.c | 148 |
1 files changed, 127 insertions, 21 deletions
diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c index c45ccd6..df24be4 100644 --- a/net/nfc/llcp/commands.c +++ b/net/nfc/llcp/commands.c @@ -261,7 +261,6 @@ int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) struct sk_buff *skb; struct nfc_dev *dev; struct nfc_llcp_local *local; - u16 size = 0; pr_debug("Sending DISC\n"); @@ -273,17 +272,10 @@ int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) if (dev == NULL) return -ENODEV; - size += LLCP_HEADER_SIZE; - size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; - - skb = alloc_skb(size, GFP_ATOMIC); + skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); if (skb == NULL) return -ENOMEM; - skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); - - skb = llcp_add_header(skb, sock->dsap, sock->ssap, LLCP_PDU_DISC); - skb_queue_tail(&local->tx_queue, skb); return 0; @@ -324,8 +316,7 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) struct sk_buff *skb; u8 *service_name_tlv = NULL, service_name_tlv_length; u8 *miux_tlv = NULL, miux_tlv_length; - u8 *rw_tlv = NULL, rw_tlv_length, rw; - __be16 miux; + u8 *rw_tlv = NULL, rw_tlv_length; int err; u16 size = 0; @@ -343,13 +334,11 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) size += service_name_tlv_length; } - miux = cpu_to_be16(LLCP_MAX_MIUX); - miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, + miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, &miux_tlv_length); size += miux_tlv_length; - rw = LLCP_MAX_RW; - rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); + rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); size += rw_tlv_length; pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); @@ -386,8 +375,7 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) struct nfc_llcp_local *local; struct sk_buff *skb; u8 *miux_tlv = NULL, miux_tlv_length; - u8 *rw_tlv = NULL, rw_tlv_length, rw; - __be16 miux; + u8 *rw_tlv = NULL, rw_tlv_length; int err; u16 size = 0; @@ -397,13 +385,11 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) if (local == NULL) return -ENODEV; - miux = cpu_to_be16(LLCP_MAX_MIUX); - miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, + miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, &miux_tlv_length); size += miux_tlv_length; - rw = LLCP_MAX_RW; - rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); + rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); size += rw_tlv_length; skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); @@ -428,6 +414,52 @@ error_tlv: return err; } +int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap) +{ + struct sk_buff *skb; + struct nfc_dev *dev; + u8 *sdres_tlv = NULL, sdres_tlv_length, sdres[2]; + u16 size = 0; + + pr_debug("Sending SNL tid 0x%x sap 0x%x\n", tid, sap); + + if (local == NULL) + return -ENODEV; + + dev = local->dev; + if (dev == NULL) + return -ENODEV; + + sdres[0] = tid; + sdres[1] = sap; + sdres_tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, sdres, 0, + &sdres_tlv_length); + if (sdres_tlv == NULL) + return -ENOMEM; + + size += LLCP_HEADER_SIZE; + size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; + size += sdres_tlv_length; + + skb = alloc_skb(size, GFP_KERNEL); + if (skb == NULL) { + kfree(sdres_tlv); + return -ENOMEM; + } + + skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); + + skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); + + memcpy(skb_put(skb, sdres_tlv_length), sdres_tlv, sdres_tlv_length); + + skb_queue_tail(&local->tx_queue, skb); + + kfree(sdres_tlv); + + return 0; +} + int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) { struct sk_buff *skb; @@ -496,6 +528,23 @@ int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, if (local == NULL) return -ENODEV; + /* Remote is ready but has not acknowledged our frames */ + if((sock->remote_ready && + skb_queue_len(&sock->tx_pending_queue) >= sock->rw && + skb_queue_len(&sock->tx_queue) >= 2 * sock->rw)) { + pr_err("Pending queue is full %d frames\n", + skb_queue_len(&sock->tx_pending_queue)); + return -ENOBUFS; + } + + /* Remote is not ready and we've been queueing enough frames */ + if ((!sock->remote_ready && + skb_queue_len(&sock->tx_queue) >= 2 * sock->rw)) { + pr_err("Tx queue is full %d frames\n", + skb_queue_len(&sock->tx_queue)); + return -ENOBUFS; + } + msg_data = kzalloc(len, GFP_KERNEL); if (msg_data == NULL) return -ENOMEM; @@ -541,6 +590,63 @@ int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, return len; } +int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, + struct msghdr *msg, size_t len) +{ + struct sk_buff *pdu; + struct nfc_llcp_local *local; + size_t frag_len = 0, remaining_len; + u8 *msg_ptr, *msg_data; + int err; + + pr_debug("Send UI frame len %zd\n", len); + + local = sock->local; + if (local == NULL) + return -ENODEV; + + msg_data = kzalloc(len, GFP_KERNEL); + if (msg_data == NULL) + return -ENOMEM; + + if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { + kfree(msg_data); + return -EFAULT; + } + + remaining_len = len; + msg_ptr = msg_data; + + while (remaining_len > 0) { + + frag_len = min_t(size_t, sock->miu, remaining_len); + + pr_debug("Fragment %zd bytes remaining %zd", + frag_len, remaining_len); + + pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, + frag_len + LLCP_HEADER_SIZE, &err); + if (pdu == NULL) { + pr_err("Could not allocate PDU\n"); + continue; + } + + pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); + + memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); + + /* No need to check for the peer RW for UI frames */ + skb_queue_tail(&local->tx_queue, pdu); + + remaining_len -= frag_len; + msg_ptr += frag_len; + } + + kfree(msg_data); + + return len; +} + int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) { struct sk_buff *skb; |
