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816 lines
16 KiB
816 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2011 Intel Corporation. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) "llcp: %s: " fmt, __func__ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/nfc.h> |
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#include <net/nfc/nfc.h> |
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#include "nfc.h" |
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#include "llcp.h" |
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static const u8 llcp_tlv_length[LLCP_TLV_MAX] = { |
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0, |
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1, /* VERSION */ |
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2, /* MIUX */ |
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2, /* WKS */ |
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1, /* LTO */ |
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1, /* RW */ |
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0, /* SN */ |
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1, /* OPT */ |
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0, /* SDREQ */ |
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2, /* SDRES */ |
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}; |
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static u8 llcp_tlv8(const u8 *tlv, u8 type) |
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{ |
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if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) |
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return 0; |
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return tlv[2]; |
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} |
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static u16 llcp_tlv16(const u8 *tlv, u8 type) |
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{ |
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if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) |
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return 0; |
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return be16_to_cpu(*((__be16 *)(tlv + 2))); |
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} |
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static u8 llcp_tlv_version(const u8 *tlv) |
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{ |
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return llcp_tlv8(tlv, LLCP_TLV_VERSION); |
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} |
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static u16 llcp_tlv_miux(const u8 *tlv) |
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{ |
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return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; |
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} |
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static u16 llcp_tlv_wks(const u8 *tlv) |
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{ |
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return llcp_tlv16(tlv, LLCP_TLV_WKS); |
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} |
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static u16 llcp_tlv_lto(const u8 *tlv) |
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{ |
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return llcp_tlv8(tlv, LLCP_TLV_LTO); |
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} |
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static u8 llcp_tlv_opt(const u8 *tlv) |
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{ |
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return llcp_tlv8(tlv, LLCP_TLV_OPT); |
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} |
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static u8 llcp_tlv_rw(const u8 *tlv) |
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{ |
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return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; |
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} |
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u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length) |
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{ |
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u8 *tlv, length; |
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pr_debug("type %d\n", type); |
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if (type >= LLCP_TLV_MAX) |
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return NULL; |
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length = llcp_tlv_length[type]; |
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if (length == 0 && value_length == 0) |
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return NULL; |
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else if (length == 0) |
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length = value_length; |
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*tlv_length = 2 + length; |
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tlv = kzalloc(2 + length, GFP_KERNEL); |
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if (tlv == NULL) |
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return tlv; |
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tlv[0] = type; |
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tlv[1] = length; |
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memcpy(tlv + 2, value, length); |
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return tlv; |
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} |
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struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap) |
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{ |
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struct nfc_llcp_sdp_tlv *sdres; |
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u8 value[2]; |
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sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); |
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if (sdres == NULL) |
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return NULL; |
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value[0] = tid; |
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value[1] = sap; |
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sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2, |
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&sdres->tlv_len); |
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if (sdres->tlv == NULL) { |
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kfree(sdres); |
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return NULL; |
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} |
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sdres->tid = tid; |
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sdres->sap = sap; |
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INIT_HLIST_NODE(&sdres->node); |
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return sdres; |
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} |
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struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri, |
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size_t uri_len) |
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{ |
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struct nfc_llcp_sdp_tlv *sdreq; |
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pr_debug("uri: %s, len: %zu\n", uri, uri_len); |
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/* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */ |
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if (WARN_ON_ONCE(uri_len > U8_MAX - 4)) |
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return NULL; |
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sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); |
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if (sdreq == NULL) |
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return NULL; |
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sdreq->tlv_len = uri_len + 3; |
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if (uri[uri_len - 1] == 0) |
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sdreq->tlv_len--; |
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sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL); |
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if (sdreq->tlv == NULL) { |
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kfree(sdreq); |
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return NULL; |
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} |
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sdreq->tlv[0] = LLCP_TLV_SDREQ; |
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sdreq->tlv[1] = sdreq->tlv_len - 2; |
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sdreq->tlv[2] = tid; |
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sdreq->tid = tid; |
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sdreq->uri = sdreq->tlv + 3; |
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memcpy(sdreq->uri, uri, uri_len); |
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sdreq->time = jiffies; |
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INIT_HLIST_NODE(&sdreq->node); |
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return sdreq; |
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} |
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void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) |
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{ |
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kfree(sdp->tlv); |
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kfree(sdp); |
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} |
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void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head) |
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{ |
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struct nfc_llcp_sdp_tlv *sdp; |
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struct hlist_node *n; |
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hlist_for_each_entry_safe(sdp, n, head, node) { |
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hlist_del(&sdp->node); |
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nfc_llcp_free_sdp_tlv(sdp); |
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} |
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} |
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int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
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const u8 *tlv_array, u16 tlv_array_len) |
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{ |
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const u8 *tlv = tlv_array; |
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u8 type, length, offset = 0; |
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pr_debug("TLV array length %d\n", tlv_array_len); |
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if (local == NULL) |
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return -ENODEV; |
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while (offset < tlv_array_len) { |
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type = tlv[0]; |
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length = tlv[1]; |
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pr_debug("type 0x%x length %d\n", type, length); |
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switch (type) { |
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case LLCP_TLV_VERSION: |
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local->remote_version = llcp_tlv_version(tlv); |
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break; |
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case LLCP_TLV_MIUX: |
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local->remote_miu = llcp_tlv_miux(tlv) + 128; |
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break; |
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case LLCP_TLV_WKS: |
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local->remote_wks = llcp_tlv_wks(tlv); |
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break; |
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case LLCP_TLV_LTO: |
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local->remote_lto = llcp_tlv_lto(tlv) * 10; |
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break; |
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case LLCP_TLV_OPT: |
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local->remote_opt = llcp_tlv_opt(tlv); |
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break; |
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default: |
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pr_err("Invalid gt tlv value 0x%x\n", type); |
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break; |
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} |
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offset += length + 2; |
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tlv += length + 2; |
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} |
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pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", |
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local->remote_version, local->remote_miu, |
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local->remote_lto, local->remote_opt, |
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local->remote_wks); |
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return 0; |
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} |
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int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, |
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const u8 *tlv_array, u16 tlv_array_len) |
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{ |
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const u8 *tlv = tlv_array; |
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u8 type, length, offset = 0; |
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pr_debug("TLV array length %d\n", tlv_array_len); |
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if (sock == NULL) |
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return -ENOTCONN; |
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while (offset < tlv_array_len) { |
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type = tlv[0]; |
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length = tlv[1]; |
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pr_debug("type 0x%x length %d\n", type, length); |
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switch (type) { |
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case LLCP_TLV_MIUX: |
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sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
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break; |
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case LLCP_TLV_RW: |
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sock->remote_rw = llcp_tlv_rw(tlv); |
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break; |
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case LLCP_TLV_SN: |
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break; |
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default: |
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pr_err("Invalid gt tlv value 0x%x\n", type); |
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break; |
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} |
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offset += length + 2; |
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tlv += length + 2; |
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} |
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pr_debug("sock %p rw %d miu %d\n", sock, |
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sock->remote_rw, sock->remote_miu); |
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return 0; |
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} |
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static struct sk_buff *llcp_add_header(struct sk_buff *pdu, |
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u8 dsap, u8 ssap, u8 ptype) |
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{ |
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u8 header[2]; |
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pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); |
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header[0] = (u8)((dsap << 2) | (ptype >> 2)); |
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header[1] = (u8)((ptype << 6) | ssap); |
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pr_debug("header 0x%x 0x%x\n", header[0], header[1]); |
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skb_put_data(pdu, header, LLCP_HEADER_SIZE); |
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return pdu; |
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} |
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static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv, |
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u8 tlv_length) |
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{ |
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/* XXX Add an skb length check */ |
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if (tlv == NULL) |
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return NULL; |
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skb_put_data(pdu, tlv, tlv_length); |
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return pdu; |
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} |
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static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, |
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u8 cmd, u16 size) |
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{ |
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struct sk_buff *skb; |
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int err; |
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if (sock->ssap == 0) |
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return NULL; |
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skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, |
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size + LLCP_HEADER_SIZE, &err); |
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if (skb == NULL) { |
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pr_err("Could not allocate PDU\n"); |
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return NULL; |
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} |
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skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); |
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return skb; |
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} |
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int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) |
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{ |
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struct sk_buff *skb; |
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struct nfc_dev *dev; |
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struct nfc_llcp_local *local; |
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pr_debug("Sending DISC\n"); |
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local = sock->local; |
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if (local == NULL) |
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return -ENODEV; |
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dev = sock->dev; |
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if (dev == NULL) |
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return -ENODEV; |
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skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
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if (skb == NULL) |
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return -ENOMEM; |
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skb_queue_tail(&local->tx_queue, skb); |
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return 0; |
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} |
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int nfc_llcp_send_symm(struct nfc_dev *dev) |
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{ |
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struct sk_buff *skb; |
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struct nfc_llcp_local *local; |
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u16 size = 0; |
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pr_debug("Sending SYMM\n"); |
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local = nfc_llcp_find_local(dev); |
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if (local == NULL) |
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return -ENODEV; |
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size += LLCP_HEADER_SIZE; |
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size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
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skb = alloc_skb(size, GFP_KERNEL); |
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if (skb == NULL) |
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return -ENOMEM; |
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skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
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skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); |
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__net_timestamp(skb); |
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nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX); |
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return nfc_data_exchange(dev, local->target_idx, skb, |
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nfc_llcp_recv, local); |
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} |
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int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) |
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{ |
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struct nfc_llcp_local *local; |
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struct sk_buff *skb; |
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const u8 *service_name_tlv = NULL; |
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const u8 *miux_tlv = NULL; |
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const u8 *rw_tlv = NULL; |
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u8 service_name_tlv_length, miux_tlv_length, rw_tlv_length, rw; |
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int err; |
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u16 size = 0; |
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__be16 miux; |
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pr_debug("Sending CONNECT\n"); |
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local = sock->local; |
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if (local == NULL) |
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return -ENODEV; |
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if (sock->service_name != NULL) { |
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service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, |
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sock->service_name, |
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sock->service_name_len, |
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&service_name_tlv_length); |
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if (!service_name_tlv) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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size += service_name_tlv_length; |
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} |
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/* If the socket parameters are not set, use the local ones */ |
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miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
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local->miux : sock->miux; |
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rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
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miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
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&miux_tlv_length); |
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if (!miux_tlv) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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size += miux_tlv_length; |
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rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
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if (!rw_tlv) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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size += rw_tlv_length; |
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pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
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skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); |
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if (skb == NULL) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length); |
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llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
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llcp_add_tlv(skb, rw_tlv, rw_tlv_length); |
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skb_queue_tail(&local->tx_queue, skb); |
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err = 0; |
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error_tlv: |
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if (err) |
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pr_err("error %d\n", err); |
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kfree(service_name_tlv); |
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kfree(miux_tlv); |
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kfree(rw_tlv); |
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return err; |
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} |
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int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) |
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{ |
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struct nfc_llcp_local *local; |
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struct sk_buff *skb; |
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const u8 *miux_tlv = NULL; |
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const u8 *rw_tlv = NULL; |
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u8 miux_tlv_length, rw_tlv_length, rw; |
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int err; |
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u16 size = 0; |
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__be16 miux; |
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pr_debug("Sending CC\n"); |
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local = sock->local; |
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if (local == NULL) |
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return -ENODEV; |
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/* If the socket parameters are not set, use the local ones */ |
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miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ? |
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local->miux : sock->miux; |
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rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
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miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
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&miux_tlv_length); |
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if (!miux_tlv) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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size += miux_tlv_length; |
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rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
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if (!rw_tlv) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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size += rw_tlv_length; |
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skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); |
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if (skb == NULL) { |
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err = -ENOMEM; |
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goto error_tlv; |
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} |
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llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
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llcp_add_tlv(skb, rw_tlv, rw_tlv_length); |
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skb_queue_tail(&local->tx_queue, skb); |
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err = 0; |
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error_tlv: |
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if (err) |
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pr_err("error %d\n", err); |
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kfree(miux_tlv); |
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kfree(rw_tlv); |
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return err; |
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} |
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static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, |
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size_t tlv_length) |
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{ |
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struct sk_buff *skb; |
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struct nfc_dev *dev; |
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u16 size = 0; |
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if (local == NULL) |
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return ERR_PTR(-ENODEV); |
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dev = local->dev; |
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if (dev == NULL) |
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return ERR_PTR(-ENODEV); |
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size += LLCP_HEADER_SIZE; |
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size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
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size += tlv_length; |
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skb = alloc_skb(size, GFP_KERNEL); |
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if (skb == NULL) |
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return ERR_PTR(-ENOMEM); |
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skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
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skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); |
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return skb; |
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} |
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int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, |
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struct hlist_head *tlv_list, size_t tlvs_len) |
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{ |
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struct nfc_llcp_sdp_tlv *sdp; |
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struct hlist_node *n; |
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struct sk_buff *skb; |
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skb = nfc_llcp_allocate_snl(local, tlvs_len); |
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if (IS_ERR(skb)) |
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return PTR_ERR(skb); |
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hlist_for_each_entry_safe(sdp, n, tlv_list, node) { |
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skb_put_data(skb, sdp->tlv, sdp->tlv_len); |
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hlist_del(&sdp->node); |
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nfc_llcp_free_sdp_tlv(sdp); |
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} |
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skb_queue_tail(&local->tx_queue, skb); |
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return 0; |
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} |
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int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local, |
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struct hlist_head *tlv_list, size_t tlvs_len) |
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{ |
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struct nfc_llcp_sdp_tlv *sdreq; |
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struct hlist_node *n; |
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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; |
|
}
|
|
|