| /* |
| * Copyright (C) 2011 Intel Corporation. All rights reserved. |
| * Copyright (C) 2014 Marvell International Ltd. |
| * |
| * 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/list.h> |
| #include <linux/nfc.h> |
| |
| #include "nfc.h" |
| #include "llcp.h" |
| |
| static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; |
| |
| static 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; |
| |
| list_for_each_entry(local, &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, version_length; |
| u8 lto_length, wks_length, miux_length; |
| u8 *version_tlv = NULL, *lto_tlv = NULL, |
| *wks_tlv = NULL, *miux_tlv = NULL; |
| __be16 wks = cpu_to_be16(local->local_wks); |
| u8 gb_len = 0; |
| int ret = 0; |
| |
| version = LLCP_VERSION_11; |
| version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, |
| 1, &version_length); |
| if (!version_tlv) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| gb_len += version_length; |
| |
| lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); |
| if (!lto_tlv) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| gb_len += lto_length; |
| |
| pr_debug("Local wks 0x%lx\n", local->local_wks); |
| wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); |
| if (!wks_tlv) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| gb_len += wks_length; |
| |
| miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
| &miux_length); |
| if (!miux_tlv) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| 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; |
| |
| if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) |
| return -EINVAL; |
| |
| local = nfc_llcp_find_local(dev); |
| if (local == NULL) { |
| pr_err("No LLCP device\n"); |
| return -ENODEV; |
| } |
| |
| 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_fclone(skb, NFC_RAW_HEADER_SIZE, |
| GFP_ATOMIC, true); |
| |
| if (skb_copy == NULL) |
| continue; |
| |
| data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); |
| |
| data[0] = local->dev ? local->dev->idx : 0xFF; |
| data[1] = direction & 0x01; |
| data[1] |= (RAW_PAYLOAD_LLCP << 1); |
| } |
| |
| 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) { |
| kfree_skb(skb); |
| nfc_llcp_send_symm(local->dev); |
| } else if (llcp_sock && !llcp_sock->remote_ready) { |
| skb_queue_head(&local->tx_queue, skb); |
| 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_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET, |
| 16, 1, skb->data, skb->len, true); |
| |
| if (ptype == LLCP_PDU_DISC && sk != NULL && |
| sk->sk_state == LLCP_DISCONNECTING) { |
| nfc_llcp_sock_unlink(&local->sockets, sk); |
| sock_orphan(sk); |
| sock_put(sk); |
| } |
| |
| if (ptype == LLCP_PDU_I) |
| copy_skb = skb_copy(skb, GFP_ATOMIC); |
| |
| __net_timestamp(skb); |
| |
| nfc_llcp_send_to_raw_sock(local, skb, |
| NFC_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, 0); |
| 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->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); |
| |
| /* 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; |
| } |
| |
| skb_put_data(new_skb, 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_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_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) { |
| kfree_skb(skb); |
| 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); |
| local->local_wks = 0x1; /* LLC Link Management */ |
| |
| 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) |
| { |
| return nfc_llcp_sock_init(); |
| } |
| |
| void nfc_llcp_exit(void) |
| { |
| nfc_llcp_sock_exit(); |
| } |