int nfc_llcp_local_put(struct nfc_llcp_local *local)
{
- WARN_ON(local == NULL);
-
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 hlist_node *node;
+ struct nfc_llcp_sock *llcp_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, node, &local->sockets.head) {
+ llcp_sock = nfc_llcp_sock(sk);
+
+ if (llcp_sock->ssap == ssap && llcp_sock->dsap == dsap)
+ 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,
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 hlist_node *node;
+ 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, node, &local->sockets.head) {
+ tmp_sock = nfc_llcp_sock(sk);
+
+ pr_debug("llcp sock %p\n", tmp_sock);
+
+ if (tmp_sock->sk.sk_state != LLCP_LISTEN)
+ 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)
{
}
/*
- * This is not a well known service,
- * we should try to find a local SDP free spot
+ * Check if there already is a non WKS socket bound
+ * to this service name.
*/
- ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
- if (ssap == LLCP_SDP_NUM_SAP) {
+ if (nfc_llcp_sock_from_sn(local, sock->service_name,
+ sock->service_name_len) != NULL) {
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;
+ return LLCP_SDP_UNBOUND;
} else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
if (!test_bit(sock->ssap, &local->local_wks)) {
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;
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;
return llcp_sock;
}
-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;
-
- 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, node, &local->sockets.head) {
- llcp_sock = nfc_llcp_sock(sk);
-
- if (llcp_sock->ssap == ssap &&
- llcp_sock->dsap == dsap)
- break;
- }
-
- read_unlock(&local->sockets.lock);
-
- if (llcp_sock == NULL)
- return NULL;
-
- sock_hold(&llcp_sock->sk);
-
- 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 sock *sk;
- struct hlist_node *node;
struct nfc_llcp_sock *llcp_sock;
- pr_debug("sn %zd\n", sn_len);
-
- if (sn == NULL || sn_len == 0)
- return NULL;
-
- read_lock(&local->sockets.lock);
-
- llcp_sock = NULL;
-
- sk_for_each(sk, node, &local->sockets.head) {
- llcp_sock = nfc_llcp_sock(sk);
-
- if (llcp_sock->sk.sk_state != LLCP_LISTEN)
- continue;
-
- if (llcp_sock->service_name == NULL ||
- llcp_sock->service_name_len == 0)
- continue;
-
- if (llcp_sock->service_name_len != sn_len)
- continue;
-
- if (memcmp(sn, llcp_sock->service_name, sn_len) == 0)
- break;
- }
-
- read_unlock(&local->sockets.lock);
+ llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
if (llcp_sock == NULL)
return NULL;
return llcp_sock;
}
-static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
-{
- sock_put(&sock->sk);
-}
-
static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
{
u8 *tlv = &skb->data[2], type, length;
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;
new_sock->local = nfc_llcp_local_get(local);
new_sock->miu = local->remote_miu;
new_sock->nfc_protocol = sock->nfc_protocol;
- new_sock->ssap = sock->ssap;
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);
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_err("Invalid DM\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);
+
+ return;
+}
+
static void nfc_llcp_rx_work(struct work_struct *work)
{
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
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_I:
case LLCP_PDU_RR:
case LLCP_PDU_RNR:
projects / ~andy / linux / blobdiff