1 files changed, 251 insertions, 170 deletions

diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index 42994fac26d6..5d503eeb15a1 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -31,47 +31,41 @@ static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
 
 static struct list_head llcp_devices;
 
-static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
+void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
 {
-        struct nfc_llcp_sock *parent, *s, *n;
-        struct sock *sk, *parent_sk;
-        int i;
-
-        mutex_lock(&local->socket_lock);
-
-        for (i = 0; i < LLCP_MAX_SAP; i++) {
-                parent = local->sockets[i];
-                if (parent == NULL)
-                        continue;
-
-                /* Release all child sockets */
-                list_for_each_entry_safe(s, n, &parent->list, list) {
-                        list_del_init(&s->list);
-                        sk = &s->sk;
-
-                        lock_sock(sk);
-
-                        if (sk->sk_state == LLCP_CONNECTED)
-                                nfc_put_device(s->dev);
+        write_lock(&l->lock);
+        sk_add_node(sk, &l->head);
+        write_unlock(&l->lock);
+}
 
-                        sk->sk_state = LLCP_CLOSED;
+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);
+}
 
-                        release_sock(sk);
+static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
+{
+        struct sock *sk;
+        struct hlist_node *node, *tmp;
+        struct nfc_llcp_sock *llcp_sock;
 
-                        sock_orphan(sk);
+        write_lock(&local->sockets.lock);
 
-                        s->local = NULL;
-                }
+        sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
+                llcp_sock = nfc_llcp_sock(sk);
 
-                parent_sk = &parent->sk;
+                lock_sock(sk);
 
-                lock_sock(parent_sk);
+                if (sk->sk_state == LLCP_CONNECTED)
+                        nfc_put_device(llcp_sock->dev);
 
-                if (parent_sk->sk_state == LLCP_LISTEN) {
+                if (sk->sk_state == LLCP_LISTEN) {
                         struct nfc_llcp_sock *lsk, *n;
                         struct sock *accept_sk;
 
-                        list_for_each_entry_safe(lsk, n, &parent->accept_queue,
+                        list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
                                                  accept_queue) {
                                 accept_sk = &lsk->sk;
                                 lock_sock(accept_sk);
@@ -83,24 +77,53 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
                                 release_sock(accept_sk);
 
                                 sock_orphan(accept_sk);
-
-                                lsk->local = NULL;
                         }
                 }
 
-                if (parent_sk->sk_state == LLCP_CONNECTED)
-                        nfc_put_device(parent->dev);
-
-                parent_sk->sk_state = LLCP_CLOSED;
+                sk->sk_state = LLCP_CLOSED;
 
-                release_sock(parent_sk);
+                release_sock(sk);
 
-                sock_orphan(parent_sk);
+                sock_orphan(sk);
 
-                parent->local = NULL;
+                sk_del_node_init(sk);
         }
 
-        mutex_unlock(&local->socket_lock);
+        write_unlock(&local->sockets.lock);
+}
+
+struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
+{
+        kref_get(&local->ref);
+
+        return local;
+}
+
+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);
+        nfc_llcp_socket_release(local);
+        del_timer_sync(&local->link_timer);
+        skb_queue_purge(&local->tx_queue);
+        destroy_workqueue(local->tx_wq);
+        destroy_workqueue(local->rx_wq);
+        destroy_workqueue(local->timeout_wq);
+        kfree_skb(local->rx_pending);
+        kfree(local);
+}
+
+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 void nfc_llcp_clear_sdp(struct nfc_llcp_local *local)
@@ -384,31 +407,9 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
                 return -EINVAL;
         }
 
-        return nfc_llcp_parse_tlv(local,
-                                  &local->remote_gb[3],
-                                  local->remote_gb_len - 3);
-}
-
-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;
-
-        skb = skb_dequeue(&local->tx_queue);
-        if (skb != NULL) {
-                pr_debug("Sending pending skb\n");
-                print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET,
-                               16, 1, skb->data, skb->len, true);
-
-                nfc_data_exchange(local->dev, local->target_idx,
-                                  skb, nfc_llcp_recv, local);
-        } else {
-                nfc_llcp_send_symm(local->dev);
-        }
-
-        mod_timer(&local->link_timer,
-                  jiffies + msecs_to_jiffies(local->remote_lto));
+        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)
@@ -443,46 +444,146 @@ static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 }
 
+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) {
+                        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);
+
+                        ret = nfc_data_exchange(local->dev, local->target_idx,
+                                                skb, nfc_llcp_recv, local);
+
+                        if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
+                                skb = skb_get(skb);
+                                skb_queue_tail(&llcp_sock->tx_pending_queue,
+                                               skb);
+                        }
+                } else {
+                        nfc_llcp_send_symm(local->dev);
+                }
+        } else {
+                nfc_llcp_send_symm(local->dev);
+        }
+
+        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;
+        struct hlist_node *node;
+
+        read_lock(&local->connecting_sockets.lock);
+
+        sk_for_each(sk, node, &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(struct nfc_llcp_local *local,
                                                u8 ssap, u8 dsap)
 {
-        struct nfc_llcp_sock *sock, *llcp_sock, *n;
+        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;
 
-        mutex_lock(&local->socket_lock);
-        sock = local->sockets[ssap];
-        if (sock == NULL) {
-                mutex_unlock(&local->socket_lock);
-                return NULL;
-        }
+        read_lock(&local->sockets.lock);
 
-        pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
+        llcp_sock = NULL;
 
-        if (sock->dsap == dsap) {
-                sock_hold(&sock->sk);
-                mutex_unlock(&local->socket_lock);
-                return sock;
+        sk_for_each(sk, node, &local->sockets.head) {
+                llcp_sock = nfc_llcp_sock(sk);
+
+                if (llcp_sock->ssap == ssap &&
+                    llcp_sock->dsap == dsap)
+                        break;
         }
 
-        list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
-                pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
-                         &llcp_sock->sk, llcp_sock->dsap);
-                if (llcp_sock->dsap == dsap) {
-                        sock_hold(&llcp_sock->sk);
-                        mutex_unlock(&local->socket_lock);
-                        return llcp_sock;
-                }
+        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;
         }
 
-        pr_err("Could not find socket for %d %d\n", ssap, dsap);
+        read_unlock(&local->sockets.lock);
 
-        mutex_unlock(&local->socket_lock);
+        if (llcp_sock == NULL)
+                return NULL;
 
-        return NULL;
+        sock_hold(&llcp_sock->sk);
+
+        return llcp_sock;
 }
 
 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
@@ -518,35 +619,19 @@ static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 {
         struct sock *new_sk, *parent;
         struct nfc_llcp_sock *sock, *new_sock;
-        u8 dsap, ssap, bound_sap, reason;
+        u8 dsap, ssap, reason;
 
         dsap = nfc_llcp_dsap(skb);
         ssap = nfc_llcp_ssap(skb);
 
         pr_debug("%d %d\n", dsap, ssap);
 
-        nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
-                           skb->len - LLCP_HEADER_SIZE);
-
         if (dsap != LLCP_SAP_SDP) {
-                bound_sap = dsap;
-
-                mutex_lock(&local->socket_lock);
-                sock = local->sockets[dsap];
-                if (sock == NULL) {
-                        mutex_unlock(&local->socket_lock);
+                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;
                 }
-
-                sock_hold(&sock->sk);
-                mutex_unlock(&local->socket_lock);
-
-                lock_sock(&sock->sk);
-
-                if (sock->dsap == LLCP_SAP_SDP &&
-                    sock->sk.sk_state == LLCP_LISTEN)
-                        goto enqueue;
         } else {
                 u8 *sn;
                 size_t sn_len;
@@ -559,40 +644,15 @@ static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 
                 pr_debug("Service name length %zu\n", sn_len);
 
-                mutex_lock(&local->socket_lock);
-                for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
-                     bound_sap++) {
-                        sock = local->sockets[bound_sap];
-                        if (sock == NULL)
-                                continue;
-
-                        if (sock->service_name == NULL ||
-                            sock->service_name_len == 0)
-                                        continue;
-
-                        if (sock->service_name_len != sn_len)
-                                continue;
-
-                        if (sock->dsap == LLCP_SAP_SDP &&
-                            sock->sk.sk_state == LLCP_LISTEN &&
-                            !memcmp(sn, sock->service_name, sn_len)) {
-                                pr_debug("Found service name at SAP %d\n",
-                                         bound_sap);
-                                sock_hold(&sock->sk);
-                                mutex_unlock(&local->socket_lock);
-
-                                lock_sock(&sock->sk);
-
-                                goto enqueue;
-                        }
+                sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
+                if (sock == NULL) {
+                        reason = LLCP_DM_NOBOUND;
+                        goto fail;
                 }
-                mutex_unlock(&local->socket_lock);
         }
 
-        reason = LLCP_DM_NOBOUND;
-        goto fail;
+        lock_sock(&sock->sk);
 
-enqueue:
         parent = &sock->sk;
 
         if (sk_acceptq_is_full(parent)) {
@@ -612,15 +672,19 @@ enqueue:
 
         new_sock = nfc_llcp_sock(new_sk);
         new_sock->dev = local->dev;
-        new_sock->local = local;
+        new_sock->local = nfc_llcp_local_get(local);
+        new_sock->miu = local->remote_miu;
         new_sock->nfc_protocol = sock->nfc_protocol;
-        new_sock->ssap = bound_sap;
+        new_sock->ssap = sock->ssap;
         new_sock->dsap = ssap;
         new_sock->parent = parent;
 
+        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);
 
-        list_add_tail(&new_sock->list, &sock->list);
+        nfc_llcp_sock_link(&local->sockets, new_sk);
 
         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 
@@ -654,12 +718,12 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 
         pr_debug("Remote ready %d tx queue len %d remote rw %d",
                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
-                 local->remote_rw);
+                 sock->rw);
 
         /* Try to queue some I frames for transmission */
         while (sock->remote_ready &&
-               skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
-                struct sk_buff *pdu, *pending_pdu;
+               skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
+                struct sk_buff *pdu;
 
                 pdu = skb_dequeue(&sock->tx_queue);
                 if (pdu == NULL)
@@ -668,10 +732,7 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
                 /* Update N(S)/N(R) */
                 nfc_llcp_set_nrns(sock, pdu);
 
-                pending_pdu = skb_clone(pdu, GFP_KERNEL);
-
                 skb_queue_tail(&local->tx_queue, pdu);
-                skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
                 nr_frames++;
         }
 
@@ -728,11 +789,21 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
 
                 llcp_sock->send_ack_n = nr;
 
-                skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
-                        if (nfc_llcp_ns(s) <= nr) {
-                                skb_unlink(s, &llcp_sock->tx_pending_queue);
-                                kfree_skb(s);
-                        }
+                /* Remove and free all skbs until ns == nr */
+                skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
+                        skb_unlink(s, &llcp_sock->tx_pending_queue);
+                        kfree_skb(s);
+
+                        if (nfc_llcp_ns(s) == 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)
@@ -740,7 +811,7 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
         else if (ptype == LLCP_PDU_RNR)
                 llcp_sock->remote_ready = false;
 
-        if (nfc_llcp_queue_i_frames(llcp_sock) == 0)
+        if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
                 nfc_llcp_send_rr(llcp_sock);
 
         release_sock(sk);
@@ -791,11 +862,7 @@ static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
         dsap = nfc_llcp_dsap(skb);
         ssap = nfc_llcp_ssap(skb);
 
-        llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
-
-        if (llcp_sock == NULL)
-                llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
-
+        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);
@@ -803,11 +870,15 @@ static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
                 return;
         }
 
-        llcp_sock->dsap = ssap;
         sk = &llcp_sock->sk;
 
-        nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
-                           skb->len - LLCP_HEADER_SIZE);
+        /* 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);
@@ -891,6 +962,21 @@ void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
         return;
 }
 
+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;
+
+        local->rx_pending = skb_get(skb);
+        del_timer(&local->link_timer);
+        queue_work(local->rx_wq, &local->rx_work);
+
+        return 0;
+}
+
 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
 {
         struct nfc_llcp_local *local;
@@ -943,8 +1029,8 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
 
         local->dev = ndev;
         INIT_LIST_HEAD(&local->list);
+        kref_init(&local->ref);
         mutex_init(&local->sdp_lock);
-        mutex_init(&local->socket_lock);
         init_timer(&local->link_timer);
         local->link_timer.data = (unsigned long) local;
         local->link_timer.function = nfc_llcp_symm_timer;
@@ -984,11 +1070,13 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
                 goto err_rx_wq;
         }
 
+        local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock);
+        local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock);
+
         nfc_llcp_build_gb(local);
 
         local->remote_miu = LLCP_DEFAULT_MIU;
         local->remote_lto = LLCP_DEFAULT_LTO;
-        local->remote_rw = LLCP_DEFAULT_RW;
 
         list_add(&llcp_devices, &local->list);
 
@@ -1015,14 +1103,7 @@ void nfc_llcp_unregister_device(struct nfc_dev *dev)
                 return;
         }
 
-        list_del(&local->list);
-        nfc_llcp_socket_release(local);
-        del_timer_sync(&local->link_timer);
-        skb_queue_purge(&local->tx_queue);
-        destroy_workqueue(local->tx_wq);
-        destroy_workqueue(local->rx_wq);
-        kfree_skb(local->rx_pending);
-        kfree(local);
+        nfc_llcp_local_put(local);
 }
 
 int __init nfc_llcp_init(void)