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Diffstat (limited to 'net/nfc/llcp/llcp.c')
-rw-r--r--net/nfc/llcp/llcp.c65
1 files changed, 39 insertions, 26 deletions
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index ec43914c92a..7f8266dd14c 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -54,7 +54,6 @@ static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
skb_queue_purge(&sock->tx_queue);
skb_queue_purge(&sock->tx_pending_queue);
- skb_queue_purge(&sock->tx_backlog_queue);
if (local == NULL)
return;
@@ -72,14 +71,14 @@ static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
{
struct sock *sk;
- struct hlist_node *node, *tmp;
+ 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, node, tmp, &local->sockets.head) {
+ sk_for_each_safe(sk, tmp, &local->sockets.head) {
llcp_sock = nfc_llcp_sock(sk);
bh_lock_sock(sk);
@@ -172,7 +171,6 @@ static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
u8 ssap, u8 dsap)
{
struct sock *sk;
- struct hlist_node *node;
struct nfc_llcp_sock *llcp_sock, *tmp_sock;
pr_debug("ssap dsap %d %d\n", ssap, dsap);
@@ -184,7 +182,7 @@ static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
llcp_sock = NULL;
- sk_for_each(sk, node, &local->sockets.head) {
+ sk_for_each(sk, &local->sockets.head) {
tmp_sock = nfc_llcp_sock(sk);
if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
@@ -273,7 +271,6 @@ struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
u8 *sn, size_t sn_len)
{
struct sock *sk;
- struct hlist_node *node;
struct nfc_llcp_sock *llcp_sock, *tmp_sock;
pr_debug("sn %zd %p\n", sn_len, sn);
@@ -285,7 +282,7 @@ struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
llcp_sock = NULL;
- sk_for_each(sk, node, &local->sockets.head) {
+ sk_for_each(sk, &local->sockets.head) {
tmp_sock = nfc_llcp_sock(sk);
pr_debug("llcp sock %p\n", tmp_sock);
@@ -550,14 +547,13 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
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 (local->remote_gb == NULL || local->remote_gb_len == 0)
- return -ENODEV;
-
if (memcmp(local->remote_gb, llcp_magic, 3)) {
pr_err("MAC does not support LLCP\n");
return -EINVAL;
@@ -603,14 +599,13 @@ static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
struct sk_buff *skb, u8 direction)
{
- struct hlist_node *node;
struct sk_buff *skb_copy = NULL, *nskb;
struct sock *sk;
u8 *data;
read_lock(&local->raw_sockets.lock);
- sk_for_each(sk, node, &local->raw_sockets.head) {
+ sk_for_each(sk, &local->raw_sockets.head) {
if (sk->sk_state != LLCP_BOUND)
continue;
@@ -668,6 +663,8 @@ static void nfc_llcp_tx_work(struct work_struct *work)
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);
@@ -697,11 +694,10 @@ static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local
{
struct sock *sk;
struct nfc_llcp_sock *llcp_sock;
- struct hlist_node *node;
read_lock(&local->connecting_sockets.lock);
- sk_for_each(sk, node, &local->connecting_sockets.head) {
+ sk_for_each(sk, &local->connecting_sockets.head) {
llcp_sock = nfc_llcp_sock(sk);
if (llcp_sock->ssap == ssap) {
@@ -781,9 +777,15 @@ static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
/* There is no sequence with UI frames */
skb_pull(skb, LLCP_HEADER_SIZE);
- if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
- pr_err("receive queue is full\n");
- skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
+ 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");
+ kfree_skb(skb);
}
nfc_llcp_sock_put(llcp_sock);
@@ -976,9 +978,15 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
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)) {
- pr_err("receive queue is full\n");
- skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
+ 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");
+ kfree_skb(skb);
}
}
@@ -1245,6 +1253,8 @@ static void nfc_llcp_rx_work(struct work_struct *work)
print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
16, 1, skb->data, skb->len, true);
+ __net_timestamp(skb);
+
nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
switch (ptype) {
@@ -1296,6 +1306,13 @@ static void nfc_llcp_rx_work(struct work_struct *work)
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;
@@ -1306,9 +1323,7 @@ void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
return;
}
- local->rx_pending = skb_get(skb);
- del_timer(&local->link_timer);
- schedule_work(&local->rx_work);
+ __nfc_llcp_recv(local, skb);
}
int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
@@ -1319,9 +1334,7 @@ int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
if (local == NULL)
return -ENODEV;
- local->rx_pending = skb_get(skb);
- del_timer(&local->link_timer);
- schedule_work(&local->rx_work);
+ __nfc_llcp_recv(local, skb);
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-03 10:35:29 +0000