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1321 lines
30 KiB
1321 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015, Sony Mobile Communications Inc. |
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* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/module.h> |
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#include <linux/netlink.h> |
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#include <linux/qrtr.h> |
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */ |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <net/sock.h> |
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#include "qrtr.h" |
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#define QRTR_PROTO_VER_1 1 |
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#define QRTR_PROTO_VER_2 3 |
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|
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/* auto-bind range */ |
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#define QRTR_MIN_EPH_SOCKET 0x4000 |
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#define QRTR_MAX_EPH_SOCKET 0x7fff |
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#define QRTR_EPH_PORT_RANGE \ |
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XA_LIMIT(QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET) |
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|
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/** |
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* struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1 |
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* @version: protocol version |
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* @type: packet type; one of QRTR_TYPE_* |
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* @src_node_id: source node |
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* @src_port_id: source port |
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* @confirm_rx: boolean; whether a resume-tx packet should be send in reply |
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* @size: length of packet, excluding this header |
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* @dst_node_id: destination node |
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* @dst_port_id: destination port |
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*/ |
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struct qrtr_hdr_v1 { |
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__le32 version; |
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__le32 type; |
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__le32 src_node_id; |
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__le32 src_port_id; |
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__le32 confirm_rx; |
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__le32 size; |
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__le32 dst_node_id; |
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__le32 dst_port_id; |
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} __packed; |
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|
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/** |
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* struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions |
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* @version: protocol version |
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* @type: packet type; one of QRTR_TYPE_* |
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* @flags: bitmask of QRTR_FLAGS_* |
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* @optlen: length of optional header data |
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* @size: length of packet, excluding this header and optlen |
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* @src_node_id: source node |
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* @src_port_id: source port |
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* @dst_node_id: destination node |
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* @dst_port_id: destination port |
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*/ |
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struct qrtr_hdr_v2 { |
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u8 version; |
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u8 type; |
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u8 flags; |
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u8 optlen; |
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__le32 size; |
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__le16 src_node_id; |
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__le16 src_port_id; |
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__le16 dst_node_id; |
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__le16 dst_port_id; |
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}; |
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|
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#define QRTR_FLAGS_CONFIRM_RX BIT(0) |
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struct qrtr_cb { |
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u32 src_node; |
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u32 src_port; |
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u32 dst_node; |
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u32 dst_port; |
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u8 type; |
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u8 confirm_rx; |
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}; |
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#define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \ |
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sizeof(struct qrtr_hdr_v2)) |
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|
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struct qrtr_sock { |
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/* WARNING: sk must be the first member */ |
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struct sock sk; |
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struct sockaddr_qrtr us; |
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struct sockaddr_qrtr peer; |
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}; |
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|
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static inline struct qrtr_sock *qrtr_sk(struct sock *sk) |
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{ |
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BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0); |
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return container_of(sk, struct qrtr_sock, sk); |
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} |
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|
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static unsigned int qrtr_local_nid = 1; |
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|
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/* for node ids */ |
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static RADIX_TREE(qrtr_nodes, GFP_ATOMIC); |
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static DEFINE_SPINLOCK(qrtr_nodes_lock); |
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/* broadcast list */ |
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static LIST_HEAD(qrtr_all_nodes); |
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/* lock for qrtr_all_nodes and node reference */ |
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static DEFINE_MUTEX(qrtr_node_lock); |
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|
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/* local port allocation management */ |
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static DEFINE_XARRAY_ALLOC(qrtr_ports); |
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|
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/** |
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* struct qrtr_node - endpoint node |
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* @ep_lock: lock for endpoint management and callbacks |
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* @ep: endpoint |
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* @ref: reference count for node |
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* @nid: node id |
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* @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port |
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* @qrtr_tx_lock: lock for qrtr_tx_flow inserts |
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* @rx_queue: receive queue |
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* @item: list item for broadcast list |
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*/ |
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struct qrtr_node { |
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struct mutex ep_lock; |
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struct qrtr_endpoint *ep; |
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struct kref ref; |
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unsigned int nid; |
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struct radix_tree_root qrtr_tx_flow; |
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struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */ |
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|
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struct sk_buff_head rx_queue; |
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struct list_head item; |
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}; |
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|
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/** |
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* struct qrtr_tx_flow - tx flow control |
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* @resume_tx: waiters for a resume tx from the remote |
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* @pending: number of waiting senders |
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* @tx_failed: indicates that a message with confirm_rx flag was lost |
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*/ |
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struct qrtr_tx_flow { |
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struct wait_queue_head resume_tx; |
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int pending; |
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int tx_failed; |
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}; |
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#define QRTR_TX_FLOW_HIGH 10 |
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#define QRTR_TX_FLOW_LOW 5 |
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|
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static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
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int type, struct sockaddr_qrtr *from, |
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struct sockaddr_qrtr *to); |
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static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
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int type, struct sockaddr_qrtr *from, |
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struct sockaddr_qrtr *to); |
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static struct qrtr_sock *qrtr_port_lookup(int port); |
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static void qrtr_port_put(struct qrtr_sock *ipc); |
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|
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/* Release node resources and free the node. |
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* |
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* Do not call directly, use qrtr_node_release. To be used with |
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* kref_put_mutex. As such, the node mutex is expected to be locked on call. |
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*/ |
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static void __qrtr_node_release(struct kref *kref) |
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{ |
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struct qrtr_node *node = container_of(kref, struct qrtr_node, ref); |
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struct radix_tree_iter iter; |
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struct qrtr_tx_flow *flow; |
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unsigned long flags; |
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void __rcu **slot; |
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|
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spin_lock_irqsave(&qrtr_nodes_lock, flags); |
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/* If the node is a bridge for other nodes, there are possibly |
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* multiple entries pointing to our released node, delete them all. |
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*/ |
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radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) { |
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if (*slot == node) |
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radix_tree_iter_delete(&qrtr_nodes, &iter, slot); |
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} |
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spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
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list_del(&node->item); |
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mutex_unlock(&qrtr_node_lock); |
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skb_queue_purge(&node->rx_queue); |
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|
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/* Free tx flow counters */ |
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radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { |
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flow = *slot; |
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radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot); |
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kfree(flow); |
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} |
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kfree(node); |
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} |
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|
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/* Increment reference to node. */ |
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static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node) |
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{ |
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if (node) |
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kref_get(&node->ref); |
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return node; |
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} |
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|
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/* Decrement reference to node and release as necessary. */ |
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static void qrtr_node_release(struct qrtr_node *node) |
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{ |
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if (!node) |
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return; |
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kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock); |
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} |
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/** |
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* qrtr_tx_resume() - reset flow control counter |
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* @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on |
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* @skb: resume_tx packet |
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*/ |
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static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb) |
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{ |
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struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data; |
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u64 remote_node = le32_to_cpu(pkt->client.node); |
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u32 remote_port = le32_to_cpu(pkt->client.port); |
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struct qrtr_tx_flow *flow; |
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unsigned long key; |
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key = remote_node << 32 | remote_port; |
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rcu_read_lock(); |
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flow = radix_tree_lookup(&node->qrtr_tx_flow, key); |
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rcu_read_unlock(); |
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if (flow) { |
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spin_lock(&flow->resume_tx.lock); |
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flow->pending = 0; |
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spin_unlock(&flow->resume_tx.lock); |
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wake_up_interruptible_all(&flow->resume_tx); |
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} |
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consume_skb(skb); |
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} |
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/** |
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* qrtr_tx_wait() - flow control for outgoing packets |
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* @node: qrtr_node that the packet is to be send to |
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* @dest_node: node id of the destination |
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* @dest_port: port number of the destination |
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* @type: type of message |
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* |
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* The flow control scheme is based around the low and high "watermarks". When |
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* the low watermark is passed the confirm_rx flag is set on the outgoing |
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* message, which will trigger the remote to send a control message of the type |
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* QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit |
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* further transmision should be paused. |
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* |
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* Return: 1 if confirm_rx should be set, 0 otherwise or errno failure |
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*/ |
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static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port, |
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int type) |
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{ |
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unsigned long key = (u64)dest_node << 32 | dest_port; |
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struct qrtr_tx_flow *flow; |
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int confirm_rx = 0; |
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int ret; |
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/* Never set confirm_rx on non-data packets */ |
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if (type != QRTR_TYPE_DATA) |
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return 0; |
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mutex_lock(&node->qrtr_tx_lock); |
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flow = radix_tree_lookup(&node->qrtr_tx_flow, key); |
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if (!flow) { |
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flow = kzalloc(sizeof(*flow), GFP_KERNEL); |
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if (flow) { |
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init_waitqueue_head(&flow->resume_tx); |
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if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) { |
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kfree(flow); |
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flow = NULL; |
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} |
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} |
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} |
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mutex_unlock(&node->qrtr_tx_lock); |
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/* Set confirm_rx if we where unable to find and allocate a flow */ |
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if (!flow) |
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return 1; |
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spin_lock_irq(&flow->resume_tx.lock); |
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ret = wait_event_interruptible_locked_irq(flow->resume_tx, |
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flow->pending < QRTR_TX_FLOW_HIGH || |
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flow->tx_failed || |
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!node->ep); |
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if (ret < 0) { |
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confirm_rx = ret; |
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} else if (!node->ep) { |
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confirm_rx = -EPIPE; |
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} else if (flow->tx_failed) { |
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flow->tx_failed = 0; |
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confirm_rx = 1; |
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} else { |
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flow->pending++; |
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confirm_rx = flow->pending == QRTR_TX_FLOW_LOW; |
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} |
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spin_unlock_irq(&flow->resume_tx.lock); |
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return confirm_rx; |
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} |
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/** |
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* qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed |
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* @node: qrtr_node that the packet is to be send to |
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* @dest_node: node id of the destination |
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* @dest_port: port number of the destination |
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* |
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* Signal that the transmission of a message with confirm_rx flag failed. The |
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* flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH, |
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* at which point transmission would stall forever waiting for the resume TX |
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* message associated with the dropped confirm_rx message. |
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* Work around this by marking the flow as having a failed transmission and |
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* cause the next transmission attempt to be sent with the confirm_rx. |
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*/ |
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static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node, |
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int dest_port) |
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{ |
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unsigned long key = (u64)dest_node << 32 | dest_port; |
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struct qrtr_tx_flow *flow; |
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rcu_read_lock(); |
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flow = radix_tree_lookup(&node->qrtr_tx_flow, key); |
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rcu_read_unlock(); |
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if (flow) { |
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spin_lock_irq(&flow->resume_tx.lock); |
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flow->tx_failed = 1; |
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spin_unlock_irq(&flow->resume_tx.lock); |
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} |
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} |
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|
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/* Pass an outgoing packet socket buffer to the endpoint driver. */ |
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static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
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int type, struct sockaddr_qrtr *from, |
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struct sockaddr_qrtr *to) |
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{ |
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struct qrtr_hdr_v1 *hdr; |
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size_t len = skb->len; |
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int rc, confirm_rx; |
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confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type); |
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if (confirm_rx < 0) { |
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kfree_skb(skb); |
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return confirm_rx; |
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} |
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hdr = skb_push(skb, sizeof(*hdr)); |
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hdr->version = cpu_to_le32(QRTR_PROTO_VER_1); |
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hdr->type = cpu_to_le32(type); |
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hdr->src_node_id = cpu_to_le32(from->sq_node); |
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hdr->src_port_id = cpu_to_le32(from->sq_port); |
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if (to->sq_port == QRTR_PORT_CTRL) { |
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hdr->dst_node_id = cpu_to_le32(node->nid); |
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hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL); |
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} else { |
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hdr->dst_node_id = cpu_to_le32(to->sq_node); |
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hdr->dst_port_id = cpu_to_le32(to->sq_port); |
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} |
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hdr->size = cpu_to_le32(len); |
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hdr->confirm_rx = !!confirm_rx; |
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|
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rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr)); |
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|
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if (!rc) { |
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mutex_lock(&node->ep_lock); |
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rc = -ENODEV; |
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if (node->ep) |
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rc = node->ep->xmit(node->ep, skb); |
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else |
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kfree_skb(skb); |
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mutex_unlock(&node->ep_lock); |
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} |
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/* Need to ensure that a subsequent message carries the otherwise lost |
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* confirm_rx flag if we dropped this one */ |
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if (rc && confirm_rx) |
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qrtr_tx_flow_failed(node, to->sq_node, to->sq_port); |
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|
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return rc; |
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} |
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|
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/* Lookup node by id. |
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* |
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* callers must release with qrtr_node_release() |
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*/ |
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static struct qrtr_node *qrtr_node_lookup(unsigned int nid) |
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{ |
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struct qrtr_node *node; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&qrtr_nodes_lock, flags); |
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node = radix_tree_lookup(&qrtr_nodes, nid); |
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node = qrtr_node_acquire(node); |
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spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
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|
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return node; |
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} |
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|
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/* Assign node id to node. |
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* |
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* This is mostly useful for automatic node id assignment, based on |
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* the source id in the incoming packet. |
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*/ |
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static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid) |
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{ |
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unsigned long flags; |
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|
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if (nid == QRTR_EP_NID_AUTO) |
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return; |
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|
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spin_lock_irqsave(&qrtr_nodes_lock, flags); |
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radix_tree_insert(&qrtr_nodes, nid, node); |
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if (node->nid == QRTR_EP_NID_AUTO) |
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node->nid = nid; |
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spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
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} |
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|
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/** |
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* qrtr_endpoint_post() - post incoming data |
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* @ep: endpoint handle |
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* @data: data pointer |
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* @len: size of data in bytes |
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* |
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* Return: 0 on success; negative error code on failure |
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*/ |
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int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) |
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{ |
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struct qrtr_node *node = ep->node; |
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const struct qrtr_hdr_v1 *v1; |
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const struct qrtr_hdr_v2 *v2; |
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struct qrtr_sock *ipc; |
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struct sk_buff *skb; |
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struct qrtr_cb *cb; |
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size_t size; |
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unsigned int ver; |
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size_t hdrlen; |
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|
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if (len == 0 || len & 3) |
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return -EINVAL; |
|
|
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skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN); |
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if (!skb) |
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return -ENOMEM; |
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|
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cb = (struct qrtr_cb *)skb->cb; |
|
|
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/* Version field in v1 is little endian, so this works for both cases */ |
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ver = *(u8*)data; |
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|
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switch (ver) { |
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case QRTR_PROTO_VER_1: |
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if (len < sizeof(*v1)) |
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goto err; |
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v1 = data; |
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hdrlen = sizeof(*v1); |
|
|
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cb->type = le32_to_cpu(v1->type); |
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cb->src_node = le32_to_cpu(v1->src_node_id); |
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cb->src_port = le32_to_cpu(v1->src_port_id); |
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cb->confirm_rx = !!v1->confirm_rx; |
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cb->dst_node = le32_to_cpu(v1->dst_node_id); |
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cb->dst_port = le32_to_cpu(v1->dst_port_id); |
|
|
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size = le32_to_cpu(v1->size); |
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break; |
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case QRTR_PROTO_VER_2: |
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if (len < sizeof(*v2)) |
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goto err; |
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v2 = data; |
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hdrlen = sizeof(*v2) + v2->optlen; |
|
|
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cb->type = v2->type; |
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cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX); |
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cb->src_node = le16_to_cpu(v2->src_node_id); |
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cb->src_port = le16_to_cpu(v2->src_port_id); |
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cb->dst_node = le16_to_cpu(v2->dst_node_id); |
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cb->dst_port = le16_to_cpu(v2->dst_port_id); |
|
|
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if (cb->src_port == (u16)QRTR_PORT_CTRL) |
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cb->src_port = QRTR_PORT_CTRL; |
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if (cb->dst_port == (u16)QRTR_PORT_CTRL) |
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cb->dst_port = QRTR_PORT_CTRL; |
|
|
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size = le32_to_cpu(v2->size); |
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break; |
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default: |
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pr_err("qrtr: Invalid version %d\n", ver); |
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goto err; |
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} |
|
|
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if (!size || len != ALIGN(size, 4) + hdrlen) |
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goto err; |
|
|
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if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && |
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cb->type != QRTR_TYPE_RESUME_TX) |
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goto err; |
|
|
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skb_put_data(skb, data + hdrlen, size); |
|
|
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qrtr_node_assign(node, cb->src_node); |
|
|
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if (cb->type == QRTR_TYPE_NEW_SERVER) { |
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/* Remote node endpoint can bridge other distant nodes */ |
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const struct qrtr_ctrl_pkt *pkt; |
|
|
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if (size < sizeof(*pkt)) |
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goto err; |
|
|
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pkt = data + hdrlen; |
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qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); |
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} |
|
|
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if (cb->type == QRTR_TYPE_RESUME_TX) { |
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qrtr_tx_resume(node, skb); |
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} else { |
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ipc = qrtr_port_lookup(cb->dst_port); |
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if (!ipc) |
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goto err; |
|
|
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if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
|
qrtr_port_put(ipc); |
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goto err; |
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} |
|
|
|
qrtr_port_put(ipc); |
|
} |
|
|
|
return 0; |
|
|
|
err: |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
|
|
} |
|
EXPORT_SYMBOL_GPL(qrtr_endpoint_post); |
|
|
|
/** |
|
* qrtr_alloc_ctrl_packet() - allocate control packet skb |
|
* @pkt: reference to qrtr_ctrl_pkt pointer |
|
* @flags: the type of memory to allocate |
|
* |
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* Returns newly allocated sk_buff, or NULL on failure |
|
* |
|
* This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and |
|
* on success returns a reference to the control packet in @pkt. |
|
*/ |
|
static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt, |
|
gfp_t flags) |
|
{ |
|
const int pkt_len = sizeof(struct qrtr_ctrl_pkt); |
|
struct sk_buff *skb; |
|
|
|
skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, flags); |
|
if (!skb) |
|
return NULL; |
|
|
|
skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
|
*pkt = skb_put_zero(skb, pkt_len); |
|
|
|
return skb; |
|
} |
|
|
|
/** |
|
* qrtr_endpoint_register() - register a new endpoint |
|
* @ep: endpoint to register |
|
* @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment |
|
* Return: 0 on success; negative error code on failure |
|
* |
|
* The specified endpoint must have the xmit function pointer set on call. |
|
*/ |
|
int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid) |
|
{ |
|
struct qrtr_node *node; |
|
|
|
if (!ep || !ep->xmit) |
|
return -EINVAL; |
|
|
|
node = kzalloc(sizeof(*node), GFP_KERNEL); |
|
if (!node) |
|
return -ENOMEM; |
|
|
|
kref_init(&node->ref); |
|
mutex_init(&node->ep_lock); |
|
skb_queue_head_init(&node->rx_queue); |
|
node->nid = QRTR_EP_NID_AUTO; |
|
node->ep = ep; |
|
|
|
INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL); |
|
mutex_init(&node->qrtr_tx_lock); |
|
|
|
qrtr_node_assign(node, nid); |
|
|
|
mutex_lock(&qrtr_node_lock); |
|
list_add(&node->item, &qrtr_all_nodes); |
|
mutex_unlock(&qrtr_node_lock); |
|
ep->node = node; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(qrtr_endpoint_register); |
|
|
|
/** |
|
* qrtr_endpoint_unregister - unregister endpoint |
|
* @ep: endpoint to unregister |
|
*/ |
|
void qrtr_endpoint_unregister(struct qrtr_endpoint *ep) |
|
{ |
|
struct qrtr_node *node = ep->node; |
|
struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL}; |
|
struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL}; |
|
struct radix_tree_iter iter; |
|
struct qrtr_ctrl_pkt *pkt; |
|
struct qrtr_tx_flow *flow; |
|
struct sk_buff *skb; |
|
unsigned long flags; |
|
void __rcu **slot; |
|
|
|
mutex_lock(&node->ep_lock); |
|
node->ep = NULL; |
|
mutex_unlock(&node->ep_lock); |
|
|
|
/* Notify the local controller about the event */ |
|
spin_lock_irqsave(&qrtr_nodes_lock, flags); |
|
radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) { |
|
if (*slot != node) |
|
continue; |
|
src.sq_node = iter.index; |
|
skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC); |
|
if (skb) { |
|
pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE); |
|
qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst); |
|
} |
|
} |
|
spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
|
|
|
/* Wake up any transmitters waiting for resume-tx from the node */ |
|
mutex_lock(&node->qrtr_tx_lock); |
|
radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { |
|
flow = *slot; |
|
wake_up_interruptible_all(&flow->resume_tx); |
|
} |
|
mutex_unlock(&node->qrtr_tx_lock); |
|
|
|
qrtr_node_release(node); |
|
ep->node = NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister); |
|
|
|
/* Lookup socket by port. |
|
* |
|
* Callers must release with qrtr_port_put() |
|
*/ |
|
static struct qrtr_sock *qrtr_port_lookup(int port) |
|
{ |
|
struct qrtr_sock *ipc; |
|
|
|
if (port == QRTR_PORT_CTRL) |
|
port = 0; |
|
|
|
rcu_read_lock(); |
|
ipc = xa_load(&qrtr_ports, port); |
|
if (ipc) |
|
sock_hold(&ipc->sk); |
|
rcu_read_unlock(); |
|
|
|
return ipc; |
|
} |
|
|
|
/* Release acquired socket. */ |
|
static void qrtr_port_put(struct qrtr_sock *ipc) |
|
{ |
|
sock_put(&ipc->sk); |
|
} |
|
|
|
/* Remove port assignment. */ |
|
static void qrtr_port_remove(struct qrtr_sock *ipc) |
|
{ |
|
struct qrtr_ctrl_pkt *pkt; |
|
struct sk_buff *skb; |
|
int port = ipc->us.sq_port; |
|
struct sockaddr_qrtr to; |
|
|
|
to.sq_family = AF_QIPCRTR; |
|
to.sq_node = QRTR_NODE_BCAST; |
|
to.sq_port = QRTR_PORT_CTRL; |
|
|
|
skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL); |
|
if (skb) { |
|
pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); |
|
pkt->client.node = cpu_to_le32(ipc->us.sq_node); |
|
pkt->client.port = cpu_to_le32(ipc->us.sq_port); |
|
|
|
skb_set_owner_w(skb, &ipc->sk); |
|
qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us, |
|
&to); |
|
} |
|
|
|
if (port == QRTR_PORT_CTRL) |
|
port = 0; |
|
|
|
__sock_put(&ipc->sk); |
|
|
|
xa_erase(&qrtr_ports, port); |
|
|
|
/* Ensure that if qrtr_port_lookup() did enter the RCU read section we |
|
* wait for it to up increment the refcount */ |
|
synchronize_rcu(); |
|
} |
|
|
|
/* Assign port number to socket. |
|
* |
|
* Specify port in the integer pointed to by port, and it will be adjusted |
|
* on return as necesssary. |
|
* |
|
* Port may be: |
|
* 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET] |
|
* <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN |
|
* >QRTR_MIN_EPH_SOCKET: Specified; available to all |
|
*/ |
|
static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) |
|
{ |
|
int rc; |
|
|
|
if (!*port) { |
|
rc = xa_alloc(&qrtr_ports, port, ipc, QRTR_EPH_PORT_RANGE, |
|
GFP_KERNEL); |
|
} else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { |
|
rc = -EACCES; |
|
} else if (*port == QRTR_PORT_CTRL) { |
|
rc = xa_insert(&qrtr_ports, 0, ipc, GFP_KERNEL); |
|
} else { |
|
rc = xa_insert(&qrtr_ports, *port, ipc, GFP_KERNEL); |
|
} |
|
|
|
if (rc == -EBUSY) |
|
return -EADDRINUSE; |
|
else if (rc < 0) |
|
return rc; |
|
|
|
sock_hold(&ipc->sk); |
|
|
|
return 0; |
|
} |
|
|
|
/* Reset all non-control ports */ |
|
static void qrtr_reset_ports(void) |
|
{ |
|
struct qrtr_sock *ipc; |
|
unsigned long index; |
|
|
|
rcu_read_lock(); |
|
xa_for_each_start(&qrtr_ports, index, ipc, 1) { |
|
sock_hold(&ipc->sk); |
|
ipc->sk.sk_err = ENETRESET; |
|
sk_error_report(&ipc->sk); |
|
sock_put(&ipc->sk); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* Bind socket to address. |
|
* |
|
* Socket should be locked upon call. |
|
*/ |
|
static int __qrtr_bind(struct socket *sock, |
|
const struct sockaddr_qrtr *addr, int zapped) |
|
{ |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sock *sk = sock->sk; |
|
int port; |
|
int rc; |
|
|
|
/* rebinding ok */ |
|
if (!zapped && addr->sq_port == ipc->us.sq_port) |
|
return 0; |
|
|
|
port = addr->sq_port; |
|
rc = qrtr_port_assign(ipc, &port); |
|
if (rc) |
|
return rc; |
|
|
|
/* unbind previous, if any */ |
|
if (!zapped) |
|
qrtr_port_remove(ipc); |
|
ipc->us.sq_port = port; |
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED); |
|
|
|
/* Notify all open ports about the new controller */ |
|
if (port == QRTR_PORT_CTRL) |
|
qrtr_reset_ports(); |
|
|
|
return 0; |
|
} |
|
|
|
/* Auto bind to an ephemeral port. */ |
|
static int qrtr_autobind(struct socket *sock) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct sockaddr_qrtr addr; |
|
|
|
if (!sock_flag(sk, SOCK_ZAPPED)) |
|
return 0; |
|
|
|
addr.sq_family = AF_QIPCRTR; |
|
addr.sq_node = qrtr_local_nid; |
|
addr.sq_port = 0; |
|
|
|
return __qrtr_bind(sock, &addr, 1); |
|
} |
|
|
|
/* Bind socket to specified sockaddr. */ |
|
static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len) |
|
{ |
|
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sock *sk = sock->sk; |
|
int rc; |
|
|
|
if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) |
|
return -EINVAL; |
|
|
|
if (addr->sq_node != ipc->us.sq_node) |
|
return -EINVAL; |
|
|
|
lock_sock(sk); |
|
rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED)); |
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
/* Queue packet to local peer socket. */ |
|
static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
|
int type, struct sockaddr_qrtr *from, |
|
struct sockaddr_qrtr *to) |
|
{ |
|
struct qrtr_sock *ipc; |
|
struct qrtr_cb *cb; |
|
|
|
ipc = qrtr_port_lookup(to->sq_port); |
|
if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ |
|
if (ipc) |
|
qrtr_port_put(ipc); |
|
kfree_skb(skb); |
|
return -ENODEV; |
|
} |
|
|
|
cb = (struct qrtr_cb *)skb->cb; |
|
cb->src_node = from->sq_node; |
|
cb->src_port = from->sq_port; |
|
|
|
if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
|
qrtr_port_put(ipc); |
|
kfree_skb(skb); |
|
return -ENOSPC; |
|
} |
|
|
|
qrtr_port_put(ipc); |
|
|
|
return 0; |
|
} |
|
|
|
/* Queue packet for broadcast. */ |
|
static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
|
int type, struct sockaddr_qrtr *from, |
|
struct sockaddr_qrtr *to) |
|
{ |
|
struct sk_buff *skbn; |
|
|
|
mutex_lock(&qrtr_node_lock); |
|
list_for_each_entry(node, &qrtr_all_nodes, item) { |
|
skbn = skb_clone(skb, GFP_KERNEL); |
|
if (!skbn) |
|
break; |
|
skb_set_owner_w(skbn, skb->sk); |
|
qrtr_node_enqueue(node, skbn, type, from, to); |
|
} |
|
mutex_unlock(&qrtr_node_lock); |
|
|
|
qrtr_local_enqueue(NULL, skb, type, from, to); |
|
|
|
return 0; |
|
} |
|
|
|
static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
|
{ |
|
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); |
|
int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, |
|
struct sockaddr_qrtr *, struct sockaddr_qrtr *); |
|
__le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sock *sk = sock->sk; |
|
struct qrtr_node *node; |
|
struct sk_buff *skb; |
|
size_t plen; |
|
u32 type; |
|
int rc; |
|
|
|
if (msg->msg_flags & ~(MSG_DONTWAIT)) |
|
return -EINVAL; |
|
|
|
if (len > 65535) |
|
return -EMSGSIZE; |
|
|
|
lock_sock(sk); |
|
|
|
if (addr) { |
|
if (msg->msg_namelen < sizeof(*addr)) { |
|
release_sock(sk); |
|
return -EINVAL; |
|
} |
|
|
|
if (addr->sq_family != AF_QIPCRTR) { |
|
release_sock(sk); |
|
return -EINVAL; |
|
} |
|
|
|
rc = qrtr_autobind(sock); |
|
if (rc) { |
|
release_sock(sk); |
|
return rc; |
|
} |
|
} else if (sk->sk_state == TCP_ESTABLISHED) { |
|
addr = &ipc->peer; |
|
} else { |
|
release_sock(sk); |
|
return -ENOTCONN; |
|
} |
|
|
|
node = NULL; |
|
if (addr->sq_node == QRTR_NODE_BCAST) { |
|
if (addr->sq_port != QRTR_PORT_CTRL && |
|
qrtr_local_nid != QRTR_NODE_BCAST) { |
|
release_sock(sk); |
|
return -ENOTCONN; |
|
} |
|
enqueue_fn = qrtr_bcast_enqueue; |
|
} else if (addr->sq_node == ipc->us.sq_node) { |
|
enqueue_fn = qrtr_local_enqueue; |
|
} else { |
|
node = qrtr_node_lookup(addr->sq_node); |
|
if (!node) { |
|
release_sock(sk); |
|
return -ECONNRESET; |
|
} |
|
enqueue_fn = qrtr_node_enqueue; |
|
} |
|
|
|
plen = (len + 3) & ~3; |
|
skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE, |
|
msg->msg_flags & MSG_DONTWAIT, &rc); |
|
if (!skb) { |
|
rc = -ENOMEM; |
|
goto out_node; |
|
} |
|
|
|
skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
|
|
|
rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
|
if (rc) { |
|
kfree_skb(skb); |
|
goto out_node; |
|
} |
|
|
|
if (ipc->us.sq_port == QRTR_PORT_CTRL) { |
|
if (len < 4) { |
|
rc = -EINVAL; |
|
kfree_skb(skb); |
|
goto out_node; |
|
} |
|
|
|
/* control messages already require the type as 'command' */ |
|
skb_copy_bits(skb, 0, &qrtr_type, 4); |
|
} |
|
|
|
type = le32_to_cpu(qrtr_type); |
|
rc = enqueue_fn(node, skb, type, &ipc->us, addr); |
|
if (rc >= 0) |
|
rc = len; |
|
|
|
out_node: |
|
qrtr_node_release(node); |
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
static int qrtr_send_resume_tx(struct qrtr_cb *cb) |
|
{ |
|
struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port }; |
|
struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port }; |
|
struct qrtr_ctrl_pkt *pkt; |
|
struct qrtr_node *node; |
|
struct sk_buff *skb; |
|
int ret; |
|
|
|
node = qrtr_node_lookup(remote.sq_node); |
|
if (!node) |
|
return -EINVAL; |
|
|
|
skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOMEM; |
|
|
|
pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX); |
|
pkt->client.node = cpu_to_le32(cb->dst_node); |
|
pkt->client.port = cpu_to_le32(cb->dst_port); |
|
|
|
ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote); |
|
|
|
qrtr_node_release(node); |
|
|
|
return ret; |
|
} |
|
|
|
static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, |
|
size_t size, int flags) |
|
{ |
|
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); |
|
struct sock *sk = sock->sk; |
|
struct sk_buff *skb; |
|
struct qrtr_cb *cb; |
|
int copied, rc; |
|
|
|
lock_sock(sk); |
|
|
|
if (sock_flag(sk, SOCK_ZAPPED)) { |
|
release_sock(sk); |
|
return -EADDRNOTAVAIL; |
|
} |
|
|
|
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
|
flags & MSG_DONTWAIT, &rc); |
|
if (!skb) { |
|
release_sock(sk); |
|
return rc; |
|
} |
|
cb = (struct qrtr_cb *)skb->cb; |
|
|
|
copied = skb->len; |
|
if (copied > size) { |
|
copied = size; |
|
msg->msg_flags |= MSG_TRUNC; |
|
} |
|
|
|
rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
|
if (rc < 0) |
|
goto out; |
|
rc = copied; |
|
|
|
if (addr) { |
|
/* There is an anonymous 2-byte hole after sq_family, |
|
* make sure to clear it. |
|
*/ |
|
memset(addr, 0, sizeof(*addr)); |
|
|
|
addr->sq_family = AF_QIPCRTR; |
|
addr->sq_node = cb->src_node; |
|
addr->sq_port = cb->src_port; |
|
msg->msg_namelen = sizeof(*addr); |
|
} |
|
|
|
out: |
|
if (cb->confirm_rx) |
|
qrtr_send_resume_tx(cb); |
|
|
|
skb_free_datagram(sk, skb); |
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
static int qrtr_connect(struct socket *sock, struct sockaddr *saddr, |
|
int len, int flags) |
|
{ |
|
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sock *sk = sock->sk; |
|
int rc; |
|
|
|
if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) |
|
return -EINVAL; |
|
|
|
lock_sock(sk); |
|
|
|
sk->sk_state = TCP_CLOSE; |
|
sock->state = SS_UNCONNECTED; |
|
|
|
rc = qrtr_autobind(sock); |
|
if (rc) { |
|
release_sock(sk); |
|
return rc; |
|
} |
|
|
|
ipc->peer = *addr; |
|
sock->state = SS_CONNECTED; |
|
sk->sk_state = TCP_ESTABLISHED; |
|
|
|
release_sock(sk); |
|
|
|
return 0; |
|
} |
|
|
|
static int qrtr_getname(struct socket *sock, struct sockaddr *saddr, |
|
int peer) |
|
{ |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sockaddr_qrtr qaddr; |
|
struct sock *sk = sock->sk; |
|
|
|
lock_sock(sk); |
|
if (peer) { |
|
if (sk->sk_state != TCP_ESTABLISHED) { |
|
release_sock(sk); |
|
return -ENOTCONN; |
|
} |
|
|
|
qaddr = ipc->peer; |
|
} else { |
|
qaddr = ipc->us; |
|
} |
|
release_sock(sk); |
|
|
|
qaddr.sq_family = AF_QIPCRTR; |
|
|
|
memcpy(saddr, &qaddr, sizeof(qaddr)); |
|
|
|
return sizeof(qaddr); |
|
} |
|
|
|
static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
|
{ |
|
void __user *argp = (void __user *)arg; |
|
struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
|
struct sock *sk = sock->sk; |
|
struct sockaddr_qrtr *sq; |
|
struct sk_buff *skb; |
|
struct ifreq ifr; |
|
long len = 0; |
|
int rc = 0; |
|
|
|
lock_sock(sk); |
|
|
|
switch (cmd) { |
|
case TIOCOUTQ: |
|
len = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
|
if (len < 0) |
|
len = 0; |
|
rc = put_user(len, (int __user *)argp); |
|
break; |
|
case TIOCINQ: |
|
skb = skb_peek(&sk->sk_receive_queue); |
|
if (skb) |
|
len = skb->len; |
|
rc = put_user(len, (int __user *)argp); |
|
break; |
|
case SIOCGIFADDR: |
|
if (get_user_ifreq(&ifr, NULL, argp)) { |
|
rc = -EFAULT; |
|
break; |
|
} |
|
|
|
sq = (struct sockaddr_qrtr *)&ifr.ifr_addr; |
|
*sq = ipc->us; |
|
if (put_user_ifreq(&ifr, argp)) { |
|
rc = -EFAULT; |
|
break; |
|
} |
|
break; |
|
case SIOCADDRT: |
|
case SIOCDELRT: |
|
case SIOCSIFADDR: |
|
case SIOCGIFDSTADDR: |
|
case SIOCSIFDSTADDR: |
|
case SIOCGIFBRDADDR: |
|
case SIOCSIFBRDADDR: |
|
case SIOCGIFNETMASK: |
|
case SIOCSIFNETMASK: |
|
rc = -EINVAL; |
|
break; |
|
default: |
|
rc = -ENOIOCTLCMD; |
|
break; |
|
} |
|
|
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
static int qrtr_release(struct socket *sock) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct qrtr_sock *ipc; |
|
|
|
if (!sk) |
|
return 0; |
|
|
|
lock_sock(sk); |
|
|
|
ipc = qrtr_sk(sk); |
|
sk->sk_shutdown = SHUTDOWN_MASK; |
|
if (!sock_flag(sk, SOCK_DEAD)) |
|
sk->sk_state_change(sk); |
|
|
|
sock_set_flag(sk, SOCK_DEAD); |
|
sock_orphan(sk); |
|
sock->sk = NULL; |
|
|
|
if (!sock_flag(sk, SOCK_ZAPPED)) |
|
qrtr_port_remove(ipc); |
|
|
|
skb_queue_purge(&sk->sk_receive_queue); |
|
|
|
release_sock(sk); |
|
sock_put(sk); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct proto_ops qrtr_proto_ops = { |
|
.owner = THIS_MODULE, |
|
.family = AF_QIPCRTR, |
|
.bind = qrtr_bind, |
|
.connect = qrtr_connect, |
|
.socketpair = sock_no_socketpair, |
|
.accept = sock_no_accept, |
|
.listen = sock_no_listen, |
|
.sendmsg = qrtr_sendmsg, |
|
.recvmsg = qrtr_recvmsg, |
|
.getname = qrtr_getname, |
|
.ioctl = qrtr_ioctl, |
|
.gettstamp = sock_gettstamp, |
|
.poll = datagram_poll, |
|
.shutdown = sock_no_shutdown, |
|
.release = qrtr_release, |
|
.mmap = sock_no_mmap, |
|
.sendpage = sock_no_sendpage, |
|
}; |
|
|
|
static struct proto qrtr_proto = { |
|
.name = "QIPCRTR", |
|
.owner = THIS_MODULE, |
|
.obj_size = sizeof(struct qrtr_sock), |
|
}; |
|
|
|
static int qrtr_create(struct net *net, struct socket *sock, |
|
int protocol, int kern) |
|
{ |
|
struct qrtr_sock *ipc; |
|
struct sock *sk; |
|
|
|
if (sock->type != SOCK_DGRAM) |
|
return -EPROTOTYPE; |
|
|
|
sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern); |
|
if (!sk) |
|
return -ENOMEM; |
|
|
|
sock_set_flag(sk, SOCK_ZAPPED); |
|
|
|
sock_init_data(sock, sk); |
|
sock->ops = &qrtr_proto_ops; |
|
|
|
ipc = qrtr_sk(sk); |
|
ipc->us.sq_family = AF_QIPCRTR; |
|
ipc->us.sq_node = qrtr_local_nid; |
|
ipc->us.sq_port = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct net_proto_family qrtr_family = { |
|
.owner = THIS_MODULE, |
|
.family = AF_QIPCRTR, |
|
.create = qrtr_create, |
|
}; |
|
|
|
static int __init qrtr_proto_init(void) |
|
{ |
|
int rc; |
|
|
|
rc = proto_register(&qrtr_proto, 1); |
|
if (rc) |
|
return rc; |
|
|
|
rc = sock_register(&qrtr_family); |
|
if (rc) |
|
goto err_proto; |
|
|
|
rc = qrtr_ns_init(); |
|
if (rc) |
|
goto err_sock; |
|
|
|
return 0; |
|
|
|
err_sock: |
|
sock_unregister(qrtr_family.family); |
|
err_proto: |
|
proto_unregister(&qrtr_proto); |
|
return rc; |
|
} |
|
postcore_initcall(qrtr_proto_init); |
|
|
|
static void __exit qrtr_proto_fini(void) |
|
{ |
|
qrtr_ns_remove(); |
|
sock_unregister(qrtr_family.family); |
|
proto_unregister(&qrtr_proto); |
|
} |
|
module_exit(qrtr_proto_fini); |
|
|
|
MODULE_DESCRIPTION("Qualcomm IPC-router driver"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_ALIAS_NETPROTO(PF_QIPCRTR);
|
|
|