cregit-Linux how code gets into the kernel

Release 4.14 net/nfc/llcp_commands.c

Directory: net/nfc
/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */


#define pr_fmt(fmt) "llcp: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nfc.h>

#include <net/nfc/nfc.h>

#include "nfc.h"
#include "llcp.h"


static 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(u8 *tlv, u8 type) { if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) return 0; return tlv[2]; }

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static u16 llcp_tlv16(u8 *tlv, u8 type) { if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) return 0; return be16_to_cpu(*((__be16 *)(tlv + 2))); }

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static u8 llcp_tlv_version(u8 *tlv) { return llcp_tlv8(tlv, LLCP_TLV_VERSION); }

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static u16 llcp_tlv_miux(u8 *tlv) { return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; }

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static u16 llcp_tlv_wks(u8 *tlv) { return llcp_tlv16(tlv, LLCP_TLV_WKS); }

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static u16 llcp_tlv_lto(u8 *tlv) { return llcp_tlv8(tlv, LLCP_TLV_LTO); }

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static u8 llcp_tlv_opt(u8 *tlv) { return llcp_tlv8(tlv, LLCP_TLV_OPT); }

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static u8 llcp_tlv_rw(u8 *tlv) { return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; }

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u8 *nfc_llcp_build_tlv(u8 type, 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; }

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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; }

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Thierry Escande119100.00%1100.00%
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struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri, size_t uri_len) { struct nfc_llcp_sdp_tlv *sdreq; pr_debug("uri: %s, len: %zu\n", uri, uri_len); 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; }

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void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) { kfree(sdp->tlv); kfree(sdp); }

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Thierry Escande22100.00%1100.00%
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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); } }

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Thierry Escande45100.00%1100.00%
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int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, u8 *tlv_array, u16 tlv_array_len) { u8 *tlv = tlv_array, 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; }

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Samuel Ortiz203100.00%2100.00%
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int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, u8 *tlv_array, u16 tlv_array_len) { u8 *tlv = tlv_array, 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; }

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Samuel Ortiz156100.00%4100.00%
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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; }

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Samuel Ortiz10599.06%150.00%
Johannes Berg10.94%150.00%
Total106100.00%2100.00%


static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, 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; }

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Samuel Ortiz4197.62%150.00%
Johannes Berg12.38%150.00%
Total42100.00%2100.00%


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; }

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Samuel Ortiz97100.00%1100.00%
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int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) { struct sk_buff *skb; struct nfc_dev *dev; struct nfc_llcp_local *local; pr_debug("Sending DISC\n"); 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; }

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Samuel Ortiz9598.96%266.67%
Thierry Escande11.04%133.33%
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int nfc_llcp_send_symm(struct nfc_dev *dev) { struct sk_buff *skb; struct nfc_llcp_local *local; u16 size = 0; pr_debug("Sending SYMM\n"); 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); }

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Samuel Ortiz12289.71%125.00%
Thierry Escande139.56%250.00%
Hiren Tandel10.74%125.00%
Total136100.00%4100.00%


int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) { struct nfc_llcp_local *local; 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; int err; u16 size = 0; __be16 miux; pr_debug("Sending CONNECT\n"); 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); 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); size += miux_tlv_length; rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); 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; }

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Samuel Ortiz28996.98%466.67%
Thierry Escande72.35%116.67%
Christophe Ricard20.67%116.67%
Total298100.00%6100.00%


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; int err; u16 size = 0; __be16 miux; pr_debug("Sending CC\n"); 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); size += miux_tlv_length; rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); 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; }

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Samuel Ortiz22496.14%466.67%
Thierry Escande73.00%116.67%
Christophe Ricard20.86%116.67%
Total233100.00%6100.00%


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; }

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Samuel Ortiz11284.85%150.00%
Thierry Escande2015.15%150.00%
Total132100.00%2100.00%


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; }

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Thierry Escande8580.19%133.33%
Samuel Ortiz2018.87%133.33%
Johannes Berg10.94%133.33%
Total106100.00%3100.00%


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; }

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Thierry Escande17199.42%266.67%
Johannes Berg10.58%133.33%
Total172100.00%3100.00%


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; }

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Samuel Ortiz14999.33%266.67%
Johannes Berg10.67%133.33%
Total150100.00%3100.00%


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; }

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Samuel Ortiz31987.16%750.00%
Olivier Guiter174.64%17.14%
Thierry Escande164.37%17.14%
Szymon Janc82.19%214.29%
Américo Wang41.09%17.14%
Al Viro10.27%17.14%
Johannes Berg10.27%17.14%
Total366100.00%14100.00%


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