mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:56:41 +07:00
3bc53be9db
syzbot is reporting stalls at nfc_llcp_send_ui_frame() [1]. This is because nfc_llcp_send_ui_frame() is retrying the loop without any delay when nonblocking nfc_alloc_send_skb() returned NULL. Since there is no need to use MSG_DONTWAIT if we retry until sock_alloc_send_pskb() succeeds, let's use blocking call. Also, in case an unexpected error occurred, let's break the loop if blocking nfc_alloc_send_skb() failed. [1] https://syzkaller.appspot.com/bug?id=4a131cc571c3733e0eff6bc673f4e36ae48f19c6 Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reported-by: syzbot <syzbot+d29d18215e477cfbfbdd@syzkaller.appspotmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
805 lines
16 KiB
C
805 lines
16 KiB
C
/*
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* Copyright (C) 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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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 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(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(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(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(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(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(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(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(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, 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, 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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u8 *tlv_array, u16 tlv_array_len)
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{
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u8 *tlv = tlv_array, 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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u8 *tlv_array, u16 tlv_array_len)
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{
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u8 *tlv = tlv_array, 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, 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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u8 *service_name_tlv = NULL, service_name_tlv_length;
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u8 *miux_tlv = NULL, miux_tlv_length;
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u8 *rw_tlv = NULL, 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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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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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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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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u8 *miux_tlv = NULL, miux_tlv_length;
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u8 *rw_tlv = NULL, 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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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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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:
|
|
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;
|
|
}
|