diff options
Diffstat (limited to 'net/nfc/llcp/llcp.c')
| -rw-r--r-- | net/nfc/llcp/llcp.c | 1624 |
1 files changed, 0 insertions, 1624 deletions
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c deleted file mode 100644 index 9e483c8e52f..00000000000 --- a/net/nfc/llcp/llcp.c +++ /dev/null @@ -1,1624 +0,0 @@ -/* - * 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, write to the - * Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#define pr_fmt(fmt) "llcp: %s: " fmt, __func__ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/nfc.h> - -#include "../nfc.h" -#include "llcp.h" - -static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; - -static struct list_head llcp_devices; - -static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); - -void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) -{ - write_lock(&l->lock); - sk_add_node(sk, &l->head); - write_unlock(&l->lock); -} - -void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) -{ - write_lock(&l->lock); - sk_del_node_init(sk); - write_unlock(&l->lock); -} - -void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock) -{ - sock->remote_rw = LLCP_DEFAULT_RW; - sock->remote_miu = LLCP_MAX_MIU + 1; -} - -static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) -{ - struct nfc_llcp_local *local = sock->local; - struct sk_buff *s, *tmp; - - pr_debug("%p\n", &sock->sk); - - skb_queue_purge(&sock->tx_queue); - skb_queue_purge(&sock->tx_pending_queue); - - if (local == NULL) - return; - - /* Search for local pending SKBs that are related to this socket */ - skb_queue_walk_safe(&local->tx_queue, s, tmp) { - if (s->sk != &sock->sk) - continue; - - skb_unlink(s, &local->tx_queue); - kfree_skb(s); - } -} - -static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device, - int err) -{ - struct sock *sk; - struct hlist_node *tmp; - struct nfc_llcp_sock *llcp_sock; - - skb_queue_purge(&local->tx_queue); - - write_lock(&local->sockets.lock); - - sk_for_each_safe(sk, tmp, &local->sockets.head) { - llcp_sock = nfc_llcp_sock(sk); - - bh_lock_sock(sk); - - nfc_llcp_socket_purge(llcp_sock); - - if (sk->sk_state == LLCP_CONNECTED) - nfc_put_device(llcp_sock->dev); - - if (sk->sk_state == LLCP_LISTEN) { - struct nfc_llcp_sock *lsk, *n; - struct sock *accept_sk; - - list_for_each_entry_safe(lsk, n, - &llcp_sock->accept_queue, - accept_queue) { - accept_sk = &lsk->sk; - bh_lock_sock(accept_sk); - - nfc_llcp_accept_unlink(accept_sk); - - if (err) - accept_sk->sk_err = err; - accept_sk->sk_state = LLCP_CLOSED; - accept_sk->sk_state_change(sk); - - bh_unlock_sock(accept_sk); - } - } - - if (err) - sk->sk_err = err; - sk->sk_state = LLCP_CLOSED; - sk->sk_state_change(sk); - - bh_unlock_sock(sk); - - sk_del_node_init(sk); - } - - write_unlock(&local->sockets.lock); - - /* If we still have a device, we keep the RAW sockets alive */ - if (device == true) - return; - - write_lock(&local->raw_sockets.lock); - - sk_for_each_safe(sk, tmp, &local->raw_sockets.head) { - llcp_sock = nfc_llcp_sock(sk); - - bh_lock_sock(sk); - - nfc_llcp_socket_purge(llcp_sock); - - if (err) - sk->sk_err = err; - sk->sk_state = LLCP_CLOSED; - sk->sk_state_change(sk); - - bh_unlock_sock(sk); - - sk_del_node_init(sk); - } - - write_unlock(&local->raw_sockets.lock); -} - -struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) -{ - kref_get(&local->ref); - - return local; -} - -static void local_cleanup(struct nfc_llcp_local *local) -{ - nfc_llcp_socket_release(local, false, ENXIO); - del_timer_sync(&local->link_timer); - skb_queue_purge(&local->tx_queue); - cancel_work_sync(&local->tx_work); - cancel_work_sync(&local->rx_work); - cancel_work_sync(&local->timeout_work); - kfree_skb(local->rx_pending); - del_timer_sync(&local->sdreq_timer); - cancel_work_sync(&local->sdreq_timeout_work); - nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs); -} - -static void local_release(struct kref *ref) -{ - struct nfc_llcp_local *local; - - local = container_of(ref, struct nfc_llcp_local, ref); - - list_del(&local->list); - local_cleanup(local); - kfree(local); -} - -int nfc_llcp_local_put(struct nfc_llcp_local *local) -{ - if (local == NULL) - return 0; - - return kref_put(&local->ref, local_release); -} - -static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, - u8 ssap, u8 dsap) -{ - struct sock *sk; - struct nfc_llcp_sock *llcp_sock, *tmp_sock; - - pr_debug("ssap dsap %d %d\n", ssap, dsap); - - if (ssap == 0 && dsap == 0) - return NULL; - - read_lock(&local->sockets.lock); - - llcp_sock = NULL; - - sk_for_each(sk, &local->sockets.head) { - tmp_sock = nfc_llcp_sock(sk); - - if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { - llcp_sock = tmp_sock; - break; - } - } - - read_unlock(&local->sockets.lock); - - if (llcp_sock == NULL) - return NULL; - - sock_hold(&llcp_sock->sk); - - return llcp_sock; -} - -static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) -{ - sock_put(&sock->sk); -} - -static void nfc_llcp_timeout_work(struct work_struct *work) -{ - struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, - timeout_work); - - nfc_dep_link_down(local->dev); -} - -static void nfc_llcp_symm_timer(unsigned long data) -{ - struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; - - pr_err("SYMM timeout\n"); - - schedule_work(&local->timeout_work); -} - -static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) -{ - unsigned long time; - HLIST_HEAD(nl_sdres_list); - struct hlist_node *n; - struct nfc_llcp_sdp_tlv *sdp; - struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, - sdreq_timeout_work); - - mutex_lock(&local->sdreq_lock); - - time = jiffies - msecs_to_jiffies(3 * local->remote_lto); - - hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { - if (time_after(sdp->time, time)) - continue; - - sdp->sap = LLCP_SDP_UNBOUND; - - hlist_del(&sdp->node); - - hlist_add_head(&sdp->node, &nl_sdres_list); - } - - if (!hlist_empty(&local->pending_sdreqs)) - mod_timer(&local->sdreq_timer, - jiffies + msecs_to_jiffies(3 * local->remote_lto)); - - mutex_unlock(&local->sdreq_lock); - - if (!hlist_empty(&nl_sdres_list)) - nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); -} - -static void nfc_llcp_sdreq_timer(unsigned long data) -{ - struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; - - schedule_work(&local->sdreq_timeout_work); -} - -struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) -{ - struct nfc_llcp_local *local, *n; - - list_for_each_entry_safe(local, n, &llcp_devices, list) - if (local->dev == dev) - return local; - - pr_debug("No device found\n"); - - return NULL; -} - -static char *wks[] = { - NULL, - NULL, /* SDP */ - "urn:nfc:sn:ip", - "urn:nfc:sn:obex", - "urn:nfc:sn:snep", -}; - -static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) -{ - int sap, num_wks; - - pr_debug("%s\n", service_name); - - if (service_name == NULL) - return -EINVAL; - - num_wks = ARRAY_SIZE(wks); - - for (sap = 0; sap < num_wks; sap++) { - if (wks[sap] == NULL) - continue; - - if (strncmp(wks[sap], service_name, service_name_len) == 0) - return sap; - } - - return -EINVAL; -} - -static -struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, - u8 *sn, size_t sn_len) -{ - struct sock *sk; - struct nfc_llcp_sock *llcp_sock, *tmp_sock; - - pr_debug("sn %zd %p\n", sn_len, sn); - - if (sn == NULL || sn_len == 0) - return NULL; - - read_lock(&local->sockets.lock); - - llcp_sock = NULL; - - sk_for_each(sk, &local->sockets.head) { - tmp_sock = nfc_llcp_sock(sk); - - pr_debug("llcp sock %p\n", tmp_sock); - - if (tmp_sock->sk.sk_type == SOCK_STREAM && - tmp_sock->sk.sk_state != LLCP_LISTEN) - continue; - - if (tmp_sock->sk.sk_type == SOCK_DGRAM && - tmp_sock->sk.sk_state != LLCP_BOUND) - continue; - - if (tmp_sock->service_name == NULL || - tmp_sock->service_name_len == 0) - continue; - - if (tmp_sock->service_name_len != sn_len) - continue; - - if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { - llcp_sock = tmp_sock; - break; - } - } - - read_unlock(&local->sockets.lock); - - pr_debug("Found llcp sock %p\n", llcp_sock); - - return llcp_sock; -} - -u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, - struct nfc_llcp_sock *sock) -{ - mutex_lock(&local->sdp_lock); - - if (sock->service_name != NULL && sock->service_name_len > 0) { - int ssap = nfc_llcp_wks_sap(sock->service_name, - sock->service_name_len); - - if (ssap > 0) { - pr_debug("WKS %d\n", ssap); - - /* This is a WKS, let's check if it's free */ - if (local->local_wks & BIT(ssap)) { - mutex_unlock(&local->sdp_lock); - - return LLCP_SAP_MAX; - } - - set_bit(ssap, &local->local_wks); - mutex_unlock(&local->sdp_lock); - - return ssap; - } - - /* - * Check if there already is a non WKS socket bound - * to this service name. - */ - if (nfc_llcp_sock_from_sn(local, sock->service_name, - sock->service_name_len) != NULL) { - mutex_unlock(&local->sdp_lock); - - return LLCP_SAP_MAX; - } - - mutex_unlock(&local->sdp_lock); - - return LLCP_SDP_UNBOUND; - - } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { - if (!test_bit(sock->ssap, &local->local_wks)) { - set_bit(sock->ssap, &local->local_wks); - mutex_unlock(&local->sdp_lock); - - return sock->ssap; - } - } - - mutex_unlock(&local->sdp_lock); - - return LLCP_SAP_MAX; -} - -u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) -{ - u8 local_ssap; - - mutex_lock(&local->sdp_lock); - - local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); - if (local_ssap == LLCP_LOCAL_NUM_SAP) { - mutex_unlock(&local->sdp_lock); - return LLCP_SAP_MAX; - } - - set_bit(local_ssap, &local->local_sap); - - mutex_unlock(&local->sdp_lock); - - return local_ssap + LLCP_LOCAL_SAP_OFFSET; -} - -void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) -{ - u8 local_ssap; - unsigned long *sdp; - - if (ssap < LLCP_WKS_NUM_SAP) { - local_ssap = ssap; - sdp = &local->local_wks; - } else if (ssap < LLCP_LOCAL_NUM_SAP) { - atomic_t *client_cnt; - - local_ssap = ssap - LLCP_WKS_NUM_SAP; - sdp = &local->local_sdp; - client_cnt = &local->local_sdp_cnt[local_ssap]; - - pr_debug("%d clients\n", atomic_read(client_cnt)); - - mutex_lock(&local->sdp_lock); - - if (atomic_dec_and_test(client_cnt)) { - struct nfc_llcp_sock *l_sock; - - pr_debug("No more clients for SAP %d\n", ssap); - - clear_bit(local_ssap, sdp); - - /* Find the listening sock and set it back to UNBOUND */ - l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); - if (l_sock) { - l_sock->ssap = LLCP_SDP_UNBOUND; - nfc_llcp_sock_put(l_sock); - } - } - - mutex_unlock(&local->sdp_lock); - - return; - } else if (ssap < LLCP_MAX_SAP) { - local_ssap = ssap - LLCP_LOCAL_NUM_SAP; - sdp = &local->local_sap; - } else { - return; - } - - mutex_lock(&local->sdp_lock); - - clear_bit(local_ssap, sdp); - - mutex_unlock(&local->sdp_lock); -} - -static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) -{ - u8 ssap; - - mutex_lock(&local->sdp_lock); - - ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); - if (ssap == LLCP_SDP_NUM_SAP) { - mutex_unlock(&local->sdp_lock); - - return LLCP_SAP_MAX; - } - - pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); - - set_bit(ssap, &local->local_sdp); - - mutex_unlock(&local->sdp_lock); - - return LLCP_WKS_NUM_SAP + ssap; -} - -static int nfc_llcp_build_gb(struct nfc_llcp_local *local) -{ - u8 *gb_cur, *version_tlv, version, version_length; - u8 *lto_tlv, lto_length; - u8 *wks_tlv, wks_length; - u8 *miux_tlv, miux_length; - u8 gb_len = 0; - int ret = 0; - - version = LLCP_VERSION_11; - version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, - 1, &version_length); - gb_len += version_length; - - lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); - gb_len += lto_length; - - pr_debug("Local wks 0x%lx\n", local->local_wks); - wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, - &wks_length); - gb_len += wks_length; - - miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, - &miux_length); - gb_len += miux_length; - - gb_len += ARRAY_SIZE(llcp_magic); - - if (gb_len > NFC_MAX_GT_LEN) { - ret = -EINVAL; - goto out; - } - - gb_cur = local->gb; - - memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); - gb_cur += ARRAY_SIZE(llcp_magic); - - memcpy(gb_cur, version_tlv, version_length); - gb_cur += version_length; - - memcpy(gb_cur, lto_tlv, lto_length); - gb_cur += lto_length; - - memcpy(gb_cur, wks_tlv, wks_length); - gb_cur += wks_length; - - memcpy(gb_cur, miux_tlv, miux_length); - gb_cur += miux_length; - - local->gb_len = gb_len; - -out: - kfree(version_tlv); - kfree(lto_tlv); - kfree(wks_tlv); - kfree(miux_tlv); - - return ret; -} - -u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) -{ - struct nfc_llcp_local *local; - - local = nfc_llcp_find_local(dev); - if (local == NULL) { - *general_bytes_len = 0; - return NULL; - } - - nfc_llcp_build_gb(local); - - *general_bytes_len = local->gb_len; - - return local->gb; -} - -int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) -{ - struct nfc_llcp_local *local = nfc_llcp_find_local(dev); - - if (local == NULL) { - pr_err("No LLCP device\n"); - return -ENODEV; - } - if (gb_len < 3) - return -EINVAL; - - memset(local->remote_gb, 0, NFC_MAX_GT_LEN); - memcpy(local->remote_gb, gb, gb_len); - local->remote_gb_len = gb_len; - - if (memcmp(local->remote_gb, llcp_magic, 3)) { - pr_err("MAC does not support LLCP\n"); - return -EINVAL; - } - - return nfc_llcp_parse_gb_tlv(local, - &local->remote_gb[3], - local->remote_gb_len - 3); -} - -static u8 nfc_llcp_dsap(struct sk_buff *pdu) -{ - return (pdu->data[0] & 0xfc) >> 2; -} - -static u8 nfc_llcp_ptype(struct sk_buff *pdu) -{ - return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); -} - -static u8 nfc_llcp_ssap(struct sk_buff *pdu) -{ - return pdu->data[1] & 0x3f; -} - -static u8 nfc_llcp_ns(struct sk_buff *pdu) -{ - return pdu->data[2] >> 4; -} - -static u8 nfc_llcp_nr(struct sk_buff *pdu) -{ - return pdu->data[2] & 0xf; -} - -static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) -{ - pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); - sock->send_n = (sock->send_n + 1) % 16; - sock->recv_ack_n = (sock->recv_n - 1) % 16; -} - -void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, - struct sk_buff *skb, u8 direction) -{ - struct sk_buff *skb_copy = NULL, *nskb; - struct sock *sk; - u8 *data; - - read_lock(&local->raw_sockets.lock); - - sk_for_each(sk, &local->raw_sockets.head) { - if (sk->sk_state != LLCP_BOUND) - continue; - - if (skb_copy == NULL) { - skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, - GFP_ATOMIC); - - if (skb_copy == NULL) - continue; - - data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); - - data[0] = local->dev ? local->dev->idx : 0xFF; - data[1] = direction; - } - - nskb = skb_clone(skb_copy, GFP_ATOMIC); - if (!nskb) - continue; - - if (sock_queue_rcv_skb(sk, nskb)) - kfree_skb(nskb); - } - - read_unlock(&local->raw_sockets.lock); - - kfree_skb(skb_copy); -} - -static void nfc_llcp_tx_work(struct work_struct *work) -{ - struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, - tx_work); - struct sk_buff *skb; - struct sock *sk; - struct nfc_llcp_sock *llcp_sock; - - skb = skb_dequeue(&local->tx_queue); - if (skb != NULL) { - sk = skb->sk; - llcp_sock = nfc_llcp_sock(sk); - - if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { - nfc_llcp_send_symm(local->dev); - } else { - struct sk_buff *copy_skb = NULL; - u8 ptype = nfc_llcp_ptype(skb); - int ret; - - pr_debug("Sending pending skb\n"); - print_hex_dump(KERN_DEBUG, "LLCP Tx: ", - DUMP_PREFIX_OFFSET, 16, 1, - skb->data, skb->len, true); - - if (ptype == LLCP_PDU_I) - copy_skb = skb_copy(skb, GFP_ATOMIC); - - __net_timestamp(skb); - - nfc_llcp_send_to_raw_sock(local, skb, - NFC_LLCP_DIRECTION_TX); - - ret = nfc_data_exchange(local->dev, local->target_idx, - skb, nfc_llcp_recv, local); - - if (ret) { - kfree_skb(copy_skb); - goto out; - } - - if (ptype == LLCP_PDU_I && copy_skb) - skb_queue_tail(&llcp_sock->tx_pending_queue, - copy_skb); - } - } else { - nfc_llcp_send_symm(local->dev); - } - -out: - mod_timer(&local->link_timer, - jiffies + msecs_to_jiffies(2 * local->remote_lto)); -} - -static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, - u8 ssap) -{ - struct sock *sk; - struct nfc_llcp_sock *llcp_sock; - - read_lock(&local->connecting_sockets.lock); - - sk_for_each(sk, &local->connecting_sockets.head) { - llcp_sock = nfc_llcp_sock(sk); - - if (llcp_sock->ssap == ssap) { - sock_hold(&llcp_sock->sk); - goto out; - } - } - - llcp_sock = NULL; - -out: - read_unlock(&local->connecting_sockets.lock); - - return llcp_sock; -} - -static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, - u8 *sn, size_t sn_len) -{ - struct nfc_llcp_sock *llcp_sock; - - llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); - - if (llcp_sock == NULL) - return NULL; - - sock_hold(&llcp_sock->sk); - - return llcp_sock; -} - -static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) -{ - u8 *tlv = &skb->data[2], type, length; - size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; - - while (offset < tlv_array_len) { - type = tlv[0]; - length = tlv[1]; - - pr_debug("type 0x%x length %d\n", type, length); - - if (type == LLCP_TLV_SN) { - *sn_len = length; - return &tlv[2]; - } - - offset += length + 2; - tlv += length + 2; - } - - return NULL; -} - -static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, - struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - struct nfc_llcp_ui_cb *ui_cb; - u8 dsap, ssap; - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - ui_cb = nfc_llcp_ui_skb_cb(skb); - ui_cb->dsap = dsap; - ui_cb->ssap = ssap; - - pr_debug("%d %d\n", dsap, ssap); - - /* We're looking for a bound socket, not a client one */ - llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); - if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) - return; - - /* There is no sequence with UI frames */ - skb_pull(skb, LLCP_HEADER_SIZE); - if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { - /* - * UI frames will be freed from the socket layer, so we - * need to keep them alive until someone receives them. - */ - skb_get(skb); - } else { - pr_err("Receive queue is full\n"); - } - - nfc_llcp_sock_put(llcp_sock); -} - -static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, - struct sk_buff *skb) -{ - struct sock *new_sk, *parent; - struct nfc_llcp_sock *sock, *new_sock; - u8 dsap, ssap, reason; - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - pr_debug("%d %d\n", dsap, ssap); - - if (dsap != LLCP_SAP_SDP) { - sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); - if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { - reason = LLCP_DM_NOBOUND; - goto fail; - } - } else { - u8 *sn; - size_t sn_len; - - sn = nfc_llcp_connect_sn(skb, &sn_len); - if (sn == NULL) { - reason = LLCP_DM_NOBOUND; - goto fail; - } - - pr_debug("Service name length %zu\n", sn_len); - - sock = nfc_llcp_sock_get_sn(local, sn, sn_len); - if (sock == NULL) { - reason = LLCP_DM_NOBOUND; - goto fail; - } - } - - lock_sock(&sock->sk); - - parent = &sock->sk; - - if (sk_acceptq_is_full(parent)) { - reason = LLCP_DM_REJ; - release_sock(&sock->sk); - sock_put(&sock->sk); - goto fail; - } - - if (sock->ssap == LLCP_SDP_UNBOUND) { - u8 ssap = nfc_llcp_reserve_sdp_ssap(local); - - pr_debug("First client, reserving %d\n", ssap); - - if (ssap == LLCP_SAP_MAX) { - reason = LLCP_DM_REJ; - release_sock(&sock->sk); - sock_put(&sock->sk); - goto fail; - } - - sock->ssap = ssap; - } - - new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); - if (new_sk == NULL) { - reason = LLCP_DM_REJ; - release_sock(&sock->sk); - sock_put(&sock->sk); - goto fail; - } - - new_sock = nfc_llcp_sock(new_sk); - new_sock->dev = local->dev; - new_sock->local = nfc_llcp_local_get(local); - new_sock->rw = sock->rw; - new_sock->miux = sock->miux; - new_sock->remote_miu = local->remote_miu; - new_sock->nfc_protocol = sock->nfc_protocol; - new_sock->dsap = ssap; - new_sock->target_idx = local->target_idx; - new_sock->parent = parent; - new_sock->ssap = sock->ssap; - if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { - atomic_t *client_count; - - pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); - - client_count = - &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; - - atomic_inc(client_count); - new_sock->reserved_ssap = sock->ssap; - } - - nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], - skb->len - LLCP_HEADER_SIZE); - - pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); - - nfc_llcp_sock_link(&local->sockets, new_sk); - - nfc_llcp_accept_enqueue(&sock->sk, new_sk); - - nfc_get_device(local->dev->idx); - - new_sk->sk_state = LLCP_CONNECTED; - - /* Wake the listening processes */ - parent->sk_data_ready(parent, 0); - - /* Send CC */ - nfc_llcp_send_cc(new_sock); - - release_sock(&sock->sk); - sock_put(&sock->sk); - - return; - -fail: - /* Send DM */ - nfc_llcp_send_dm(local, dsap, ssap, reason); -} - -int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) -{ - int nr_frames = 0; - struct nfc_llcp_local *local = sock->local; - - pr_debug("Remote ready %d tx queue len %d remote rw %d", - sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), - sock->remote_rw); - - /* Try to queue some I frames for transmission */ - while (sock->remote_ready && - skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { - struct sk_buff *pdu; - - pdu = skb_dequeue(&sock->tx_queue); - if (pdu == NULL) - break; - - /* Update N(S)/N(R) */ - nfc_llcp_set_nrns(sock, pdu); - - skb_queue_tail(&local->tx_queue, pdu); - nr_frames++; - } - - return nr_frames; -} - -static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, - struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - struct sock *sk; - u8 dsap, ssap, ptype, ns, nr; - - ptype = nfc_llcp_ptype(skb); - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - ns = nfc_llcp_ns(skb); - nr = nfc_llcp_nr(skb); - - pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); - - llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); - if (llcp_sock == NULL) { - nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); - return; - } - - sk = &llcp_sock->sk; - lock_sock(sk); - if (sk->sk_state == LLCP_CLOSED) { - release_sock(sk); - nfc_llcp_sock_put(llcp_sock); - } - - /* Pass the payload upstream */ - if (ptype == LLCP_PDU_I) { - pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); - - if (ns == llcp_sock->recv_n) - llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; - else - pr_err("Received out of sequence I PDU\n"); - - skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); - if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { - /* - * I frames will be freed from the socket layer, so we - * need to keep them alive until someone receives them. - */ - skb_get(skb); - } else { - pr_err("Receive queue is full\n"); - } - } - - /* Remove skbs from the pending queue */ - if (llcp_sock->send_ack_n != nr) { - struct sk_buff *s, *tmp; - u8 n; - - llcp_sock->send_ack_n = nr; - - /* Remove and free all skbs until ns == nr */ - skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { - n = nfc_llcp_ns(s); - - skb_unlink(s, &llcp_sock->tx_pending_queue); - kfree_skb(s); - - if (n == nr) - break; - } - - /* Re-queue the remaining skbs for transmission */ - skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, - s, tmp) { - skb_unlink(s, &llcp_sock->tx_pending_queue); - skb_queue_head(&local->tx_queue, s); - } - } - - if (ptype == LLCP_PDU_RR) - llcp_sock->remote_ready = true; - else if (ptype == LLCP_PDU_RNR) - llcp_sock->remote_ready = false; - - if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) - nfc_llcp_send_rr(llcp_sock); - - release_sock(sk); - nfc_llcp_sock_put(llcp_sock); -} - -static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, - struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - struct sock *sk; - u8 dsap, ssap; - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - if ((dsap == 0) && (ssap == 0)) { - pr_debug("Connection termination"); - nfc_dep_link_down(local->dev); - return; - } - - llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); - if (llcp_sock == NULL) { - nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); - return; - } - - sk = &llcp_sock->sk; - lock_sock(sk); - - nfc_llcp_socket_purge(llcp_sock); - - if (sk->sk_state == LLCP_CLOSED) { - release_sock(sk); - nfc_llcp_sock_put(llcp_sock); - } - - if (sk->sk_state == LLCP_CONNECTED) { - nfc_put_device(local->dev); - sk->sk_state = LLCP_CLOSED; - sk->sk_state_change(sk); - } - - nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); - - release_sock(sk); - nfc_llcp_sock_put(llcp_sock); -} - -static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - struct sock *sk; - u8 dsap, ssap; - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); - if (llcp_sock == NULL) { - pr_err("Invalid CC\n"); - nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); - - return; - } - - sk = &llcp_sock->sk; - - /* Unlink from connecting and link to the client array */ - nfc_llcp_sock_unlink(&local->connecting_sockets, sk); - nfc_llcp_sock_link(&local->sockets, sk); - llcp_sock->dsap = ssap; - - nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], - skb->len - LLCP_HEADER_SIZE); - - sk->sk_state = LLCP_CONNECTED; - sk->sk_state_change(sk); - - nfc_llcp_sock_put(llcp_sock); -} - -static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - struct sock *sk; - u8 dsap, ssap, reason; - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - reason = skb->data[2]; - - pr_debug("%d %d reason %d\n", ssap, dsap, reason); - - switch (reason) { - case LLCP_DM_NOBOUND: - case LLCP_DM_REJ: - llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); - break; - - default: - llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); - break; - } - - if (llcp_sock == NULL) { - pr_debug("Already closed\n"); - return; - } - - sk = &llcp_sock->sk; - - sk->sk_err = ENXIO; - sk->sk_state = LLCP_CLOSED; - sk->sk_state_change(sk); - - nfc_llcp_sock_put(llcp_sock); -} - -static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, - struct sk_buff *skb) -{ - struct nfc_llcp_sock *llcp_sock; - u8 dsap, ssap, *tlv, type, length, tid, sap; - u16 tlv_len, offset; - char *service_name; - size_t service_name_len; - struct nfc_llcp_sdp_tlv *sdp; - HLIST_HEAD(llc_sdres_list); - size_t sdres_tlvs_len; - HLIST_HEAD(nl_sdres_list); - - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - pr_debug("%d %d\n", dsap, ssap); - - if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { - pr_err("Wrong SNL SAP\n"); - return; - } - - tlv = &skb->data[LLCP_HEADER_SIZE]; - tlv_len = skb->len - LLCP_HEADER_SIZE; - offset = 0; - sdres_tlvs_len = 0; - - while (offset < tlv_len) { - type = tlv[0]; - length = tlv[1]; - - switch (type) { - case LLCP_TLV_SDREQ: - tid = tlv[2]; - service_name = (char *) &tlv[3]; - service_name_len = length - 1; - - pr_debug("Looking for %.16s\n", service_name); - - if (service_name_len == strlen("urn:nfc:sn:sdp") && - !strncmp(service_name, "urn:nfc:sn:sdp", - service_name_len)) { - sap = 1; - goto add_snl; - } - - llcp_sock = nfc_llcp_sock_from_sn(local, service_name, - service_name_len); - if (!llcp_sock) { - sap = 0; - goto add_snl; - } - - /* - * We found a socket but its ssap has not been reserved - * yet. We need to assign it for good and send a reply. - * The ssap will be freed when the socket is closed. - */ - if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { - atomic_t *client_count; - - sap = nfc_llcp_reserve_sdp_ssap(local); - - pr_debug("Reserving %d\n", sap); - - if (sap == LLCP_SAP_MAX) { - sap = 0; - goto add_snl; - } - - client_count = - &local->local_sdp_cnt[sap - - LLCP_WKS_NUM_SAP]; - - atomic_inc(client_count); - - llcp_sock->ssap = sap; - llcp_sock->reserved_ssap = sap; - } else { - sap = llcp_sock->ssap; - } - - pr_debug("%p %d\n", llcp_sock, sap); - -add_snl: - sdp = nfc_llcp_build_sdres_tlv(tid, sap); - if (sdp == NULL) - goto exit; - - sdres_tlvs_len += sdp->tlv_len; - hlist_add_head(&sdp->node, &llc_sdres_list); - break; - - case LLCP_TLV_SDRES: - mutex_lock(&local->sdreq_lock); - - pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); - - hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { - if (sdp->tid != tlv[2]) - continue; - - sdp->sap = tlv[3]; - - pr_debug("Found: uri=%s, sap=%d\n", - sdp->uri, sdp->sap); - - hlist_del(&sdp->node); - - hlist_add_head(&sdp->node, &nl_sdres_list); - - break; - } - - mutex_unlock(&local->sdreq_lock); - break; - - default: - pr_err("Invalid SNL tlv value 0x%x\n", type); - break; - } - - offset += length + 2; - tlv += length + 2; - } - -exit: - if (!hlist_empty(&nl_sdres_list)) - nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); - - if (!hlist_empty(&llc_sdres_list)) - nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); -} - -static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) -{ - u8 ptype; - u16 pdu_len; - struct sk_buff *new_skb; - - if (skb->len <= LLCP_HEADER_SIZE) { - pr_err("Malformed AGF PDU\n"); - return; - } - - skb_pull(skb, LLCP_HEADER_SIZE); - - while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { - pdu_len = skb->data[0] << 8 | skb->data[1]; - - skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); - - if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { - pr_err("Malformed AGF PDU\n"); - return; - } - - ptype = nfc_llcp_ptype(skb); - - if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) - goto next; - - new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); - if (new_skb == NULL) { - pr_err("Could not allocate PDU\n"); - return; - } - - memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len); - - nfc_llcp_rx_skb(local, new_skb); - - kfree_skb(new_skb); -next: - skb_pull(skb, pdu_len); - } -} - -static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) -{ - u8 dsap, ssap, ptype; - - ptype = nfc_llcp_ptype(skb); - dsap = nfc_llcp_dsap(skb); - ssap = nfc_llcp_ssap(skb); - - pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); - - if (ptype != LLCP_PDU_SYMM) - print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, - 16, 1, skb->data, skb->len, true); - - switch (ptype) { - case LLCP_PDU_SYMM: - pr_debug("SYMM\n"); - break; - - case LLCP_PDU_UI: - pr_debug("UI\n"); - nfc_llcp_recv_ui(local, skb); - break; - - case LLCP_PDU_CONNECT: - pr_debug("CONNECT\n"); - nfc_llcp_recv_connect(local, skb); - break; - - case LLCP_PDU_DISC: - pr_debug("DISC\n"); - nfc_llcp_recv_disc(local, skb); - break; - - case LLCP_PDU_CC: - pr_debug("CC\n"); - nfc_llcp_recv_cc(local, skb); - break; - - case LLCP_PDU_DM: - pr_debug("DM\n"); - nfc_llcp_recv_dm(local, skb); - break; - - case LLCP_PDU_SNL: - pr_debug("SNL\n"); - nfc_llcp_recv_snl(local, skb); - break; - - case LLCP_PDU_I: - case LLCP_PDU_RR: - case LLCP_PDU_RNR: - pr_debug("I frame\n"); - nfc_llcp_recv_hdlc(local, skb); - break; - - case LLCP_PDU_AGF: - pr_debug("AGF frame\n"); - nfc_llcp_recv_agf(local, skb); - break; - } -} - -static void nfc_llcp_rx_work(struct work_struct *work) -{ - struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, - rx_work); - struct sk_buff *skb; - - skb = local->rx_pending; - if (skb == NULL) { - pr_debug("No pending SKB\n"); - return; - } - - __net_timestamp(skb); - - nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); - - nfc_llcp_rx_skb(local, skb); - - schedule_work(&local->tx_work); - kfree_skb(local->rx_pending); - local->rx_pending = NULL; -} - -static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) -{ - local->rx_pending = skb; - del_timer(&local->link_timer); - schedule_work(&local->rx_work); -} - -void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) -{ - struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; - - pr_debug("Received an LLCP PDU\n"); - if (err < 0) { - pr_err("err %d\n", err); - return; - } - - __nfc_llcp_recv(local, skb); -} - -int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) -{ - struct nfc_llcp_local *local; - - local = nfc_llcp_find_local(dev); - if (local == NULL) - return -ENODEV; - - __nfc_llcp_recv(local, skb); - - return 0; -} - -void nfc_llcp_mac_is_down(struct nfc_dev *dev) -{ - struct nfc_llcp_local *local; - - local = nfc_llcp_find_local(dev); - if (local == NULL) - return; - - local->remote_miu = LLCP_DEFAULT_MIU; - local->remote_lto = LLCP_DEFAULT_LTO; - - /* Close and purge all existing sockets */ - nfc_llcp_socket_release(local, true, 0); -} - -void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, - u8 comm_mode, u8 rf_mode) -{ - struct nfc_llcp_local *local; - - pr_debug("rf mode %d\n", rf_mode); - - local = nfc_llcp_find_local(dev); - if (local == NULL) - return; - - local->target_idx = target_idx; - local->comm_mode = comm_mode; - local->rf_mode = rf_mode; - - if (rf_mode == NFC_RF_INITIATOR) { - pr_debug("Queueing Tx work\n"); - - schedule_work(&local->tx_work); - } else { - mod_timer(&local->link_timer, - jiffies + msecs_to_jiffies(local->remote_lto)); - } -} - -int nfc_llcp_register_device(struct nfc_dev *ndev) -{ - struct nfc_llcp_local *local; - - local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); - if (local == NULL) - return -ENOMEM; - - local->dev = ndev; - INIT_LIST_HEAD(&local->list); - kref_init(&local->ref); - mutex_init(&local->sdp_lock); - init_timer(&local->link_timer); - local->link_timer.data = (unsigned long) local; - local->link_timer.function = nfc_llcp_symm_timer; - - skb_queue_head_init(&local->tx_queue); - INIT_WORK(&local->tx_work, nfc_llcp_tx_work); - - local->rx_pending = NULL; - INIT_WORK(&local->rx_work, nfc_llcp_rx_work); - - INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); - - rwlock_init(&local->sockets.lock); - rwlock_init(&local->connecting_sockets.lock); - rwlock_init(&local->raw_sockets.lock); - - local->lto = 150; /* 1500 ms */ - local->rw = LLCP_MAX_RW; - local->miux = cpu_to_be16(LLCP_MAX_MIUX); - - nfc_llcp_build_gb(local); - - local->remote_miu = LLCP_DEFAULT_MIU; - local->remote_lto = LLCP_DEFAULT_LTO; - - mutex_init(&local->sdreq_lock); - INIT_HLIST_HEAD(&local->pending_sdreqs); - init_timer(&local->sdreq_timer); - local->sdreq_timer.data = (unsigned long) local; - local->sdreq_timer.function = nfc_llcp_sdreq_timer; - INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); - - list_add(&local->list, &llcp_devices); - - return 0; -} - -void nfc_llcp_unregister_device(struct nfc_dev *dev) -{ - struct nfc_llcp_local *local = nfc_llcp_find_local(dev); - - if (local == NULL) { - pr_debug("No such device\n"); - return; - } - - local_cleanup(local); - - nfc_llcp_local_put(local); -} - -int __init nfc_llcp_init(void) -{ - INIT_LIST_HEAD(&llcp_devices); - - return nfc_llcp_sock_init(); -} - -void nfc_llcp_exit(void) -{ - nfc_llcp_sock_exit(); -} |