From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/nfc/llcp_commands.c | 808 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 808 insertions(+) create mode 100644 net/nfc/llcp_commands.c (limited to 'net/nfc/llcp_commands.c') diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c new file mode 100644 index 000000000..41e3a20c8 --- /dev/null +++ b/net/nfc/llcp_commands.c @@ -0,0 +1,808 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2011 Intel Corporation. All rights reserved. + */ + +#define pr_fmt(fmt) "llcp: %s: " fmt, __func__ + +#include +#include +#include +#include + +#include + +#include "nfc.h" +#include "llcp.h" + +static const u8 llcp_tlv_length[LLCP_TLV_MAX] = { + 0, + 1, /* VERSION */ + 2, /* MIUX */ + 2, /* WKS */ + 1, /* LTO */ + 1, /* RW */ + 0, /* SN */ + 1, /* OPT */ + 0, /* SDREQ */ + 2, /* SDRES */ + +}; + +static u8 llcp_tlv8(const u8 *tlv, u8 type) +{ + if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) + return 0; + + return tlv[2]; +} + +static u16 llcp_tlv16(const u8 *tlv, u8 type) +{ + if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) + return 0; + + return be16_to_cpu(*((__be16 *)(tlv + 2))); +} + + +static u8 llcp_tlv_version(const u8 *tlv) +{ + return llcp_tlv8(tlv, LLCP_TLV_VERSION); +} + +static u16 llcp_tlv_miux(const u8 *tlv) +{ + return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; +} + +static u16 llcp_tlv_wks(const u8 *tlv) +{ + return llcp_tlv16(tlv, LLCP_TLV_WKS); +} + +static u16 llcp_tlv_lto(const u8 *tlv) +{ + return llcp_tlv8(tlv, LLCP_TLV_LTO); +} + +static u8 llcp_tlv_opt(const u8 *tlv) +{ + return llcp_tlv8(tlv, LLCP_TLV_OPT); +} + +static u8 llcp_tlv_rw(const u8 *tlv) +{ + return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; +} + +u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length) +{ + u8 *tlv, length; + + pr_debug("type %d\n", type); + + if (type >= LLCP_TLV_MAX) + return NULL; + + length = llcp_tlv_length[type]; + if (length == 0 && value_length == 0) + return NULL; + else if (length == 0) + length = value_length; + + *tlv_length = 2 + length; + tlv = kzalloc(2 + length, GFP_KERNEL); + if (tlv == NULL) + return tlv; + + tlv[0] = type; + tlv[1] = length; + memcpy(tlv + 2, value, length); + + return tlv; +} + +struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap) +{ + struct nfc_llcp_sdp_tlv *sdres; + u8 value[2]; + + sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); + if (sdres == NULL) + return NULL; + + value[0] = tid; + value[1] = sap; + + sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2, + &sdres->tlv_len); + if (sdres->tlv == NULL) { + kfree(sdres); + return NULL; + } + + sdres->tid = tid; + sdres->sap = sap; + + INIT_HLIST_NODE(&sdres->node); + + return sdres; +} + +struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri, + size_t uri_len) +{ + struct nfc_llcp_sdp_tlv *sdreq; + + pr_debug("uri: %s, len: %zu\n", uri, uri_len); + + /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */ + if (WARN_ON_ONCE(uri_len > U8_MAX - 4)) + return NULL; + + sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); + if (sdreq == NULL) + return NULL; + + sdreq->tlv_len = uri_len + 3; + + if (uri[uri_len - 1] == 0) + sdreq->tlv_len--; + + sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL); + if (sdreq->tlv == NULL) { + kfree(sdreq); + return NULL; + } + + sdreq->tlv[0] = LLCP_TLV_SDREQ; + sdreq->tlv[1] = sdreq->tlv_len - 2; + sdreq->tlv[2] = tid; + + sdreq->tid = tid; + sdreq->uri = sdreq->tlv + 3; + memcpy(sdreq->uri, uri, uri_len); + + sdreq->time = jiffies; + + INIT_HLIST_NODE(&sdreq->node); + + return sdreq; +} + +void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) +{ + kfree(sdp->tlv); + kfree(sdp); +} + +void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head) +{ + struct nfc_llcp_sdp_tlv *sdp; + struct hlist_node *n; + + hlist_for_each_entry_safe(sdp, n, head, node) { + hlist_del(&sdp->node); + + nfc_llcp_free_sdp_tlv(sdp); + } +} + +int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, + const u8 *tlv_array, u16 tlv_array_len) +{ + const u8 *tlv = tlv_array; + u8 type, length, offset = 0; + + pr_debug("TLV array length %d\n", tlv_array_len); + + if (local == NULL) + return -ENODEV; + + while (offset < tlv_array_len) { + type = tlv[0]; + length = tlv[1]; + + pr_debug("type 0x%x length %d\n", type, length); + + switch (type) { + case LLCP_TLV_VERSION: + local->remote_version = llcp_tlv_version(tlv); + break; + case LLCP_TLV_MIUX: + local->remote_miu = llcp_tlv_miux(tlv) + 128; + break; + case LLCP_TLV_WKS: + local->remote_wks = llcp_tlv_wks(tlv); + break; + case LLCP_TLV_LTO: + local->remote_lto = llcp_tlv_lto(tlv) * 10; + break; + case LLCP_TLV_OPT: + local->remote_opt = llcp_tlv_opt(tlv); + break; + default: + pr_err("Invalid gt tlv value 0x%x\n", type); + break; + } + + offset += length + 2; + tlv += length + 2; + } + + pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", + local->remote_version, local->remote_miu, + local->remote_lto, local->remote_opt, + local->remote_wks); + + return 0; +} + +int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, + const u8 *tlv_array, u16 tlv_array_len) +{ + const u8 *tlv = tlv_array; + u8 type, length, offset = 0; + + pr_debug("TLV array length %d\n", tlv_array_len); + + if (sock == NULL) + return -ENOTCONN; + + while (offset < tlv_array_len) { + type = tlv[0]; + length = tlv[1]; + + pr_debug("type 0x%x length %d\n", type, length); + + switch (type) { + case LLCP_TLV_MIUX: + sock->remote_miu = llcp_tlv_miux(tlv) + 128; + break; + case LLCP_TLV_RW: + sock->remote_rw = llcp_tlv_rw(tlv); + break; + case LLCP_TLV_SN: + break; + default: + pr_err("Invalid gt tlv value 0x%x\n", type); + break; + } + + offset += length + 2; + tlv += length + 2; + } + + pr_debug("sock %p rw %d miu %d\n", sock, + sock->remote_rw, sock->remote_miu); + + return 0; +} + +static struct sk_buff *llcp_add_header(struct sk_buff *pdu, + u8 dsap, u8 ssap, u8 ptype) +{ + u8 header[2]; + + pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); + + header[0] = (u8)((dsap << 2) | (ptype >> 2)); + header[1] = (u8)((ptype << 6) | ssap); + + pr_debug("header 0x%x 0x%x\n", header[0], header[1]); + + skb_put_data(pdu, header, LLCP_HEADER_SIZE); + + return pdu; +} + +static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv, + u8 tlv_length) +{ + /* XXX Add an skb length check */ + + if (tlv == NULL) + return NULL; + + skb_put_data(pdu, tlv, tlv_length); + + return pdu; +} + +static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, + u8 cmd, u16 size) +{ + struct sk_buff *skb; + int err; + + if (sock->ssap == 0) + return NULL; + + skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, + size + LLCP_HEADER_SIZE, &err); + if (skb == NULL) { + pr_err("Could not allocate PDU\n"); + return NULL; + } + + skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); + + return skb; +} + +int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) +{ + struct sk_buff *skb; + struct nfc_dev *dev; + struct nfc_llcp_local *local; + + local = sock->local; + if (local == NULL) + return -ENODEV; + + dev = sock->dev; + if (dev == NULL) + return -ENODEV; + + skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); + if (skb == NULL) + return -ENOMEM; + + skb_queue_tail(&local->tx_queue, skb); + + return 0; +} + +int nfc_llcp_send_symm(struct nfc_dev *dev) +{ + struct sk_buff *skb; + struct nfc_llcp_local *local; + u16 size = 0; + + local = nfc_llcp_find_local(dev); + if (local == NULL) + return -ENODEV; + + size += LLCP_HEADER_SIZE; + size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; + + skb = alloc_skb(size, GFP_KERNEL); + if (skb == NULL) + return -ENOMEM; + + skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); + + skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); + + __net_timestamp(skb); + + nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX); + + return nfc_data_exchange(dev, local->target_idx, skb, + nfc_llcp_recv, local); +} + +int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) +{ + struct nfc_llcp_local *local; + struct sk_buff *skb; + const u8 *service_name_tlv = NULL; + const u8 *miux_tlv = NULL; + const u8 *rw_tlv = NULL; + u8 service_name_tlv_length, miux_tlv_length, rw_tlv_length, rw; + int err; + u16 size = 0; + __be16 miux; + + local = sock->local; + if (local == NULL) + return -ENODEV; + + if (sock->service_name != NULL) { + service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, + sock->service_name, + sock->service_name_len, + &service_name_tlv_length); + if (!service_name_tlv) { + err = -ENOMEM; + goto error_tlv; + } + size += service_name_tlv_length; + } + + /* If the socket parameters are not set, use the local ones */ + miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? + local->miux : sock->miux; + rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; + + miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, + &miux_tlv_length); + if (!miux_tlv) { + err = -ENOMEM; + goto error_tlv; + } + size += miux_tlv_length; + + rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); + if (!rw_tlv) { + err = -ENOMEM; + goto error_tlv; + } + size += rw_tlv_length; + + pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); + + skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); + if (skb == NULL) { + err = -ENOMEM; + goto error_tlv; + } + + llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length); + llcp_add_tlv(skb, miux_tlv, miux_tlv_length); + llcp_add_tlv(skb, rw_tlv, rw_tlv_length); + + skb_queue_tail(&local->tx_queue, skb); + + err = 0; + +error_tlv: + if (err) + pr_err("error %d\n", err); + + kfree(service_name_tlv); + kfree(miux_tlv); + kfree(rw_tlv); + + return err; +} + +int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) +{ + struct nfc_llcp_local *local; + struct sk_buff *skb; + const u8 *miux_tlv = NULL; + const u8 *rw_tlv = NULL; + u8 miux_tlv_length, rw_tlv_length, rw; + int err; + u16 size = 0; + __be16 miux; + + local = sock->local; + if (local == NULL) + return -ENODEV; + + /* If the socket parameters are not set, use the local ones */ + miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? + local->miux : sock->miux; + rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; + + miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, + &miux_tlv_length); + if (!miux_tlv) { + err = -ENOMEM; + goto error_tlv; + } + size += miux_tlv_length; + + rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); + if (!rw_tlv) { + err = -ENOMEM; + goto error_tlv; + } + size += rw_tlv_length; + + skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); + if (skb == NULL) { + err = -ENOMEM; + goto error_tlv; + } + + llcp_add_tlv(skb, miux_tlv, miux_tlv_length); + llcp_add_tlv(skb, rw_tlv, rw_tlv_length); + + skb_queue_tail(&local->tx_queue, skb); + + err = 0; + +error_tlv: + if (err) + pr_err("error %d\n", err); + + kfree(miux_tlv); + kfree(rw_tlv); + + return err; +} + +static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, + size_t tlv_length) +{ + struct sk_buff *skb; + struct nfc_dev *dev; + u16 size = 0; + + if (local == NULL) + return ERR_PTR(-ENODEV); + + dev = local->dev; + if (dev == NULL) + return ERR_PTR(-ENODEV); + + size += LLCP_HEADER_SIZE; + size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; + size += tlv_length; + + skb = alloc_skb(size, GFP_KERNEL); + if (skb == NULL) + return ERR_PTR(-ENOMEM); + + skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); + + skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); + + return skb; +} + +int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, + struct hlist_head *tlv_list, size_t tlvs_len) +{ + struct nfc_llcp_sdp_tlv *sdp; + struct hlist_node *n; + struct sk_buff *skb; + + skb = nfc_llcp_allocate_snl(local, tlvs_len); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + hlist_for_each_entry_safe(sdp, n, tlv_list, node) { + skb_put_data(skb, sdp->tlv, sdp->tlv_len); + + hlist_del(&sdp->node); + + nfc_llcp_free_sdp_tlv(sdp); + } + + skb_queue_tail(&local->tx_queue, skb); + + return 0; +} + +int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, + struct hlist_head *tlv_list, size_t tlvs_len) +{ + struct nfc_llcp_sdp_tlv *sdreq; + struct hlist_node *n; + struct sk_buff *skb; + + skb = nfc_llcp_allocate_snl(local, tlvs_len); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + mutex_lock(&local->sdreq_lock); + + if (hlist_empty(&local->pending_sdreqs)) + mod_timer(&local->sdreq_timer, + jiffies + msecs_to_jiffies(3 * local->remote_lto)); + + hlist_for_each_entry_safe(sdreq, n, tlv_list, node) { + pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri); + + skb_put_data(skb, sdreq->tlv, sdreq->tlv_len); + + hlist_del(&sdreq->node); + + hlist_add_head(&sdreq->node, &local->pending_sdreqs); + } + + mutex_unlock(&local->sdreq_lock); + + skb_queue_tail(&local->tx_queue, skb); + + return 0; +} + +int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) +{ + struct sk_buff *skb; + struct nfc_dev *dev; + u16 size = 1; /* Reason code */ + + pr_debug("Sending DM reason 0x%x\n", reason); + + if (local == NULL) + return -ENODEV; + + dev = local->dev; + if (dev == NULL) + return -ENODEV; + + size += LLCP_HEADER_SIZE; + size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; + + skb = alloc_skb(size, GFP_KERNEL); + if (skb == NULL) + return -ENOMEM; + + skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); + + skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); + + skb_put_data(skb, &reason, 1); + + skb_queue_head(&local->tx_queue, skb); + + 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 = &sock->sk; + struct nfc_llcp_local *local; + size_t frag_len = 0, remaining_len; + u8 *msg_data, *msg_ptr; + u16 remote_miu; + + pr_debug("Send I frame len %zd\n", len); + + local = sock->local; + 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->remote_rw && + skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_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->remote_rw)) { + pr_err("Tx queue is full %d frames\n", + skb_queue_len(&sock->tx_queue)); + return -ENOBUFS; + } + + msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); + if (msg_data == NULL) + return -ENOMEM; + + if (memcpy_from_msg(msg_data, msg, len)) { + kfree(msg_data); + return -EFAULT; + } + + remaining_len = len; + msg_ptr = msg_data; + + do { + remote_miu = sock->remote_miu > LLCP_MAX_MIU ? + LLCP_DEFAULT_MIU : sock->remote_miu; + + frag_len = min_t(size_t, remote_miu, remaining_len); + + pr_debug("Fragment %zd bytes remaining %zd", + frag_len, remaining_len); + + pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, + frag_len + LLCP_SEQUENCE_SIZE); + if (pdu == NULL) { + kfree(msg_data); + return -ENOMEM; + } + + skb_put(pdu, LLCP_SEQUENCE_SIZE); + + if (likely(frag_len > 0)) + skb_put_data(pdu, msg_ptr, frag_len); + + skb_queue_tail(&sock->tx_queue, pdu); + + lock_sock(sk); + + nfc_llcp_queue_i_frames(sock); + + release_sock(sk); + + remaining_len -= frag_len; + msg_ptr += frag_len; + } while (remaining_len > 0); + + kfree(msg_data); + + 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; + u16 remote_miu; + int err; + + pr_debug("Send UI frame len %zd\n", len); + + local = sock->local; + if (local == NULL) + return -ENODEV; + + msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN); + if (msg_data == NULL) + return -ENOMEM; + + if (memcpy_from_msg(msg_data, msg, len)) { + kfree(msg_data); + return -EFAULT; + } + + remaining_len = len; + msg_ptr = msg_data; + + do { + remote_miu = sock->remote_miu > LLCP_MAX_MIU ? + local->remote_miu : sock->remote_miu; + + frag_len = min_t(size_t, remote_miu, remaining_len); + + pr_debug("Fragment %zd bytes remaining %zd", + frag_len, remaining_len); + + pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, 0, + frag_len + LLCP_HEADER_SIZE, &err); + if (pdu == NULL) { + pr_err("Could not allocate PDU (error=%d)\n", err); + len -= remaining_len; + if (len == 0) + len = err; + break; + } + + pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); + + if (likely(frag_len > 0)) + skb_put_data(pdu, 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; + } while (remaining_len > 0); + + kfree(msg_data); + + return len; +} + +int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) +{ + struct sk_buff *skb; + struct nfc_llcp_local *local; + + pr_debug("Send rr nr %d\n", sock->recv_n); + + local = sock->local; + if (local == NULL) + return -ENODEV; + + skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); + if (skb == NULL) + return -ENOMEM; + + skb_put(skb, LLCP_SEQUENCE_SIZE); + + skb->data[2] = sock->recv_n; + + skb_queue_head(&local->tx_queue, skb); + + return 0; +} -- cgit v1.2.3