v4.19.13 snapshot.
diff --git a/net/qrtr/Kconfig b/net/qrtr/Kconfig
new file mode 100644
index 0000000..1944834
--- /dev/null
+++ b/net/qrtr/Kconfig
@@ -0,0 +1,31 @@
+# Qualcomm IPC Router configuration
+#
+
+config QRTR
+ tristate "Qualcomm IPC Router support"
+ depends on ARCH_QCOM || COMPILE_TEST
+ ---help---
+ Say Y if you intend to use Qualcomm IPC router protocol. The
+ protocol is used to communicate with services provided by other
+ hardware blocks in the system.
+
+ In order to do service lookups, a userspace daemon is required to
+ maintain a service listing.
+
+if QRTR
+
+config QRTR_SMD
+ tristate "SMD IPC Router channels"
+ depends on RPMSG || (COMPILE_TEST && RPMSG=n)
+ ---help---
+ Say Y here to support SMD based ipcrouter channels. SMD is the
+ most common transport for IPC Router.
+
+config QRTR_TUN
+ tristate "TUN device for Qualcomm IPC Router"
+ ---help---
+ Say Y here to expose a character device that allows user space to
+ implement endpoints of QRTR, for purpose of tunneling data to other
+ hosts or testing purposes.
+
+endif # QRTR
diff --git a/net/qrtr/Makefile b/net/qrtr/Makefile
new file mode 100644
index 0000000..be012bf
--- /dev/null
+++ b/net/qrtr/Makefile
@@ -0,0 +1,6 @@
+obj-$(CONFIG_QRTR) := qrtr.o
+
+obj-$(CONFIG_QRTR_SMD) += qrtr-smd.o
+qrtr-smd-y := smd.o
+obj-$(CONFIG_QRTR_TUN) += qrtr-tun.o
+qrtr-tun-y := tun.o
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
new file mode 100644
index 0000000..86e1e37
--- /dev/null
+++ b/net/qrtr/qrtr.c
@@ -0,0 +1,1147 @@
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/qrtr.h>
+#include <linux/termios.h> /* For TIOCINQ/OUTQ */
+
+#include <net/sock.h>
+
+#include "qrtr.h"
+
+#define QRTR_PROTO_VER_1 1
+#define QRTR_PROTO_VER_2 3
+
+/* auto-bind range */
+#define QRTR_MIN_EPH_SOCKET 0x4000
+#define QRTR_MAX_EPH_SOCKET 0x7fff
+
+/**
+ * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1
+ * @version: protocol version
+ * @type: packet type; one of QRTR_TYPE_*
+ * @src_node_id: source node
+ * @src_port_id: source port
+ * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
+ * @size: length of packet, excluding this header
+ * @dst_node_id: destination node
+ * @dst_port_id: destination port
+ */
+struct qrtr_hdr_v1 {
+ __le32 version;
+ __le32 type;
+ __le32 src_node_id;
+ __le32 src_port_id;
+ __le32 confirm_rx;
+ __le32 size;
+ __le32 dst_node_id;
+ __le32 dst_port_id;
+} __packed;
+
+/**
+ * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions
+ * @version: protocol version
+ * @type: packet type; one of QRTR_TYPE_*
+ * @flags: bitmask of QRTR_FLAGS_*
+ * @optlen: length of optional header data
+ * @size: length of packet, excluding this header and optlen
+ * @src_node_id: source node
+ * @src_port_id: source port
+ * @dst_node_id: destination node
+ * @dst_port_id: destination port
+ */
+struct qrtr_hdr_v2 {
+ u8 version;
+ u8 type;
+ u8 flags;
+ u8 optlen;
+ __le32 size;
+ __le16 src_node_id;
+ __le16 src_port_id;
+ __le16 dst_node_id;
+ __le16 dst_port_id;
+};
+
+#define QRTR_FLAGS_CONFIRM_RX BIT(0)
+
+struct qrtr_cb {
+ u32 src_node;
+ u32 src_port;
+ u32 dst_node;
+ u32 dst_port;
+
+ u8 type;
+ u8 confirm_rx;
+};
+
+#define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \
+ sizeof(struct qrtr_hdr_v2))
+
+struct qrtr_sock {
+ /* WARNING: sk must be the first member */
+ struct sock sk;
+ struct sockaddr_qrtr us;
+ struct sockaddr_qrtr peer;
+};
+
+static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
+{
+ BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
+ return container_of(sk, struct qrtr_sock, sk);
+}
+
+static unsigned int qrtr_local_nid = -1;
+
+/* for node ids */
+static RADIX_TREE(qrtr_nodes, GFP_KERNEL);
+/* broadcast list */
+static LIST_HEAD(qrtr_all_nodes);
+/* lock for qrtr_nodes, qrtr_all_nodes and node reference */
+static DEFINE_MUTEX(qrtr_node_lock);
+
+/* local port allocation management */
+static DEFINE_IDR(qrtr_ports);
+static DEFINE_MUTEX(qrtr_port_lock);
+
+/**
+ * struct qrtr_node - endpoint node
+ * @ep_lock: lock for endpoint management and callbacks
+ * @ep: endpoint
+ * @ref: reference count for node
+ * @nid: node id
+ * @rx_queue: receive queue
+ * @work: scheduled work struct for recv work
+ * @item: list item for broadcast list
+ */
+struct qrtr_node {
+ struct mutex ep_lock;
+ struct qrtr_endpoint *ep;
+ struct kref ref;
+ unsigned int nid;
+
+ struct sk_buff_head rx_queue;
+ struct work_struct work;
+ struct list_head item;
+};
+
+static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
+ int type, struct sockaddr_qrtr *from,
+ struct sockaddr_qrtr *to);
+static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
+ int type, struct sockaddr_qrtr *from,
+ struct sockaddr_qrtr *to);
+
+/* Release node resources and free the node.
+ *
+ * Do not call directly, use qrtr_node_release. To be used with
+ * kref_put_mutex. As such, the node mutex is expected to be locked on call.
+ */
+static void __qrtr_node_release(struct kref *kref)
+{
+ struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
+
+ if (node->nid != QRTR_EP_NID_AUTO)
+ radix_tree_delete(&qrtr_nodes, node->nid);
+
+ list_del(&node->item);
+ mutex_unlock(&qrtr_node_lock);
+
+ skb_queue_purge(&node->rx_queue);
+ kfree(node);
+}
+
+/* Increment reference to node. */
+static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
+{
+ if (node)
+ kref_get(&node->ref);
+ return node;
+}
+
+/* Decrement reference to node and release as necessary. */
+static void qrtr_node_release(struct qrtr_node *node)
+{
+ if (!node)
+ return;
+ kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
+}
+
+/* Pass an outgoing packet socket buffer to the endpoint driver. */
+static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
+ int type, struct sockaddr_qrtr *from,
+ struct sockaddr_qrtr *to)
+{
+ struct qrtr_hdr_v1 *hdr;
+ size_t len = skb->len;
+ int rc = -ENODEV;
+
+ hdr = skb_push(skb, sizeof(*hdr));
+ hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
+ hdr->type = cpu_to_le32(type);
+ hdr->src_node_id = cpu_to_le32(from->sq_node);
+ hdr->src_port_id = cpu_to_le32(from->sq_port);
+ if (to->sq_port == QRTR_PORT_CTRL) {
+ hdr->dst_node_id = cpu_to_le32(node->nid);
+ hdr->dst_port_id = cpu_to_le32(QRTR_NODE_BCAST);
+ } else {
+ hdr->dst_node_id = cpu_to_le32(to->sq_node);
+ hdr->dst_port_id = cpu_to_le32(to->sq_port);
+ }
+
+ hdr->size = cpu_to_le32(len);
+ hdr->confirm_rx = 0;
+
+ skb_put_padto(skb, ALIGN(len, 4));
+
+ mutex_lock(&node->ep_lock);
+ if (node->ep)
+ rc = node->ep->xmit(node->ep, skb);
+ else
+ kfree_skb(skb);
+ mutex_unlock(&node->ep_lock);
+
+ return rc;
+}
+
+/* Lookup node by id.
+ *
+ * callers must release with qrtr_node_release()
+ */
+static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
+{
+ struct qrtr_node *node;
+
+ mutex_lock(&qrtr_node_lock);
+ node = radix_tree_lookup(&qrtr_nodes, nid);
+ node = qrtr_node_acquire(node);
+ mutex_unlock(&qrtr_node_lock);
+
+ return node;
+}
+
+/* Assign node id to node.
+ *
+ * This is mostly useful for automatic node id assignment, based on
+ * the source id in the incoming packet.
+ */
+static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
+{
+ if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO)
+ return;
+
+ mutex_lock(&qrtr_node_lock);
+ radix_tree_insert(&qrtr_nodes, nid, node);
+ node->nid = nid;
+ mutex_unlock(&qrtr_node_lock);
+}
+
+/**
+ * qrtr_endpoint_post() - post incoming data
+ * @ep: endpoint handle
+ * @data: data pointer
+ * @len: size of data in bytes
+ *
+ * Return: 0 on success; negative error code on failure
+ */
+int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
+{
+ struct qrtr_node *node = ep->node;
+ const struct qrtr_hdr_v1 *v1;
+ const struct qrtr_hdr_v2 *v2;
+ struct sk_buff *skb;
+ struct qrtr_cb *cb;
+ unsigned int size;
+ unsigned int ver;
+ size_t hdrlen;
+
+ if (len & 3)
+ return -EINVAL;
+
+ skb = netdev_alloc_skb(NULL, len);
+ if (!skb)
+ return -ENOMEM;
+
+ cb = (struct qrtr_cb *)skb->cb;
+
+ /* Version field in v1 is little endian, so this works for both cases */
+ ver = *(u8*)data;
+
+ switch (ver) {
+ case QRTR_PROTO_VER_1:
+ v1 = data;
+ hdrlen = sizeof(*v1);
+
+ cb->type = le32_to_cpu(v1->type);
+ cb->src_node = le32_to_cpu(v1->src_node_id);
+ cb->src_port = le32_to_cpu(v1->src_port_id);
+ cb->confirm_rx = !!v1->confirm_rx;
+ cb->dst_node = le32_to_cpu(v1->dst_node_id);
+ cb->dst_port = le32_to_cpu(v1->dst_port_id);
+
+ size = le32_to_cpu(v1->size);
+ break;
+ case QRTR_PROTO_VER_2:
+ v2 = data;
+ hdrlen = sizeof(*v2) + v2->optlen;
+
+ cb->type = v2->type;
+ cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
+ cb->src_node = le16_to_cpu(v2->src_node_id);
+ cb->src_port = le16_to_cpu(v2->src_port_id);
+ cb->dst_node = le16_to_cpu(v2->dst_node_id);
+ cb->dst_port = le16_to_cpu(v2->dst_port_id);
+
+ if (cb->src_port == (u16)QRTR_PORT_CTRL)
+ cb->src_port = QRTR_PORT_CTRL;
+ if (cb->dst_port == (u16)QRTR_PORT_CTRL)
+ cb->dst_port = QRTR_PORT_CTRL;
+
+ size = le32_to_cpu(v2->size);
+ break;
+ default:
+ pr_err("qrtr: Invalid version %d\n", ver);
+ goto err;
+ }
+
+ if (len != ALIGN(size, 4) + hdrlen)
+ goto err;
+
+ if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA)
+ goto err;
+
+ skb_put_data(skb, data + hdrlen, size);
+
+ skb_queue_tail(&node->rx_queue, skb);
+ schedule_work(&node->work);
+
+ 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
+ *
+ * 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)
+{
+ const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
+ struct sk_buff *skb;
+
+ skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ skb_reserve(skb, QRTR_HDR_MAX_SIZE);
+ *pkt = skb_put_zero(skb, pkt_len);
+
+ return skb;
+}
+
+static struct qrtr_sock *qrtr_port_lookup(int port);
+static void qrtr_port_put(struct qrtr_sock *ipc);
+
+/* Handle and route a received packet.
+ *
+ * This will auto-reply with resume-tx packet as necessary.
+ */
+static void qrtr_node_rx_work(struct work_struct *work)
+{
+ struct qrtr_node *node = container_of(work, struct qrtr_node, work);
+ struct qrtr_ctrl_pkt *pkt;
+ struct sockaddr_qrtr dst;
+ struct sockaddr_qrtr src;
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&node->rx_queue)) != NULL) {
+ struct qrtr_sock *ipc;
+ struct qrtr_cb *cb;
+ int confirm;
+
+ cb = (struct qrtr_cb *)skb->cb;
+ src.sq_node = cb->src_node;
+ src.sq_port = cb->src_port;
+ dst.sq_node = cb->dst_node;
+ dst.sq_port = cb->dst_port;
+ confirm = !!cb->confirm_rx;
+
+ qrtr_node_assign(node, cb->src_node);
+
+ ipc = qrtr_port_lookup(cb->dst_port);
+ if (!ipc) {
+ kfree_skb(skb);
+ } else {
+ if (sock_queue_rcv_skb(&ipc->sk, skb))
+ kfree_skb(skb);
+
+ qrtr_port_put(ipc);
+ }
+
+ if (confirm) {
+ skb = qrtr_alloc_ctrl_packet(&pkt);
+ if (!skb)
+ break;
+
+ pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
+ pkt->client.node = cpu_to_le32(dst.sq_node);
+ pkt->client.port = cpu_to_le32(dst.sq_port);
+
+ if (qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX,
+ &dst, &src))
+ break;
+ }
+ }
+}
+
+/**
+ * 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;
+
+ INIT_WORK(&node->work, qrtr_node_rx_work);
+ 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;
+
+ 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 qrtr_ctrl_pkt *pkt;
+ struct sk_buff *skb;
+
+ mutex_lock(&node->ep_lock);
+ node->ep = NULL;
+ mutex_unlock(&node->ep_lock);
+
+ /* Notify the local controller about the event */
+ skb = qrtr_alloc_ctrl_packet(&pkt);
+ if (skb) {
+ pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
+ qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
+ }
+
+ 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;
+
+ mutex_lock(&qrtr_port_lock);
+ ipc = idr_find(&qrtr_ports, port);
+ if (ipc)
+ sock_hold(&ipc->sk);
+ mutex_unlock(&qrtr_port_lock);
+
+ 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);
+ 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);
+
+ mutex_lock(&qrtr_port_lock);
+ idr_remove(&qrtr_ports, port);
+ mutex_unlock(&qrtr_port_lock);
+}
+
+/* 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;
+
+ mutex_lock(&qrtr_port_lock);
+ if (!*port) {
+ rc = idr_alloc(&qrtr_ports, ipc,
+ QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1,
+ GFP_ATOMIC);
+ if (rc >= 0)
+ *port = rc;
+ } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
+ rc = -EACCES;
+ } else if (*port == QRTR_PORT_CTRL) {
+ rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC);
+ } else {
+ rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC);
+ if (rc >= 0)
+ *port = rc;
+ }
+ mutex_unlock(&qrtr_port_lock);
+
+ if (rc == -ENOSPC)
+ 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;
+ int id;
+
+ mutex_lock(&qrtr_port_lock);
+ idr_for_each_entry(&qrtr_ports, ipc, id) {
+ /* Don't reset control port */
+ if (id == 0)
+ continue;
+
+ sock_hold(&ipc->sk);
+ ipc->sk.sk_err = ENETRESET;
+ ipc->sk.sk_error_report(&ipc->sk);
+ sock_put(&ipc->sk);
+ }
+ mutex_unlock(&qrtr_port_lock);
+}
+
+/* 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 */
+ 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(node, 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 *);
+ 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 = QRTR_TYPE_DATA;
+ 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) {
+ enqueue_fn = qrtr_bcast_enqueue;
+ if (addr->sq_port != QRTR_PORT_CTRL) {
+ release_sock(sk);
+ return -ENOTCONN;
+ }
+ } else if (addr->sq_node == ipc->us.sq_node) {
+ enqueue_fn = qrtr_local_enqueue;
+ } else {
+ enqueue_fn = qrtr_node_enqueue;
+ node = qrtr_node_lookup(addr->sq_node);
+ if (!node) {
+ release_sock(sk);
+ return -ECONNRESET;
+ }
+ }
+
+ plen = (len + 3) & ~3;
+ skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
+ msg->msg_flags & MSG_DONTWAIT, &rc);
+ if (!skb)
+ 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, &type, 4);
+ type = le32_to_cpu(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_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;
+ }
+
+ 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) {
+ cb = (struct qrtr_cb *)skb->cb;
+ addr->sq_family = AF_QIPCRTR;
+ addr->sq_node = cb->src_node;
+ addr->sq_port = cb->src_port;
+ msg->msg_namelen = sizeof(*addr);
+ }
+
+out:
+ 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 (copy_from_user(&ifr, argp, sizeof(ifr))) {
+ rc = -EFAULT;
+ break;
+ }
+
+ sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
+ *sq = ipc->us;
+ if (copy_to_user(argp, &ifr, sizeof(ifr))) {
+ rc = -EFAULT;
+ break;
+ }
+ break;
+ case SIOCGSTAMP:
+ rc = sock_get_timestamp(sk, argp);
+ 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->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,
+ .poll = datagram_poll,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = sock_no_setsockopt,
+ .getsockopt = sock_no_getsockopt,
+ .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 nla_policy qrtr_policy[IFA_MAX + 1] = {
+ [IFA_LOCAL] = { .type = NLA_U32 },
+};
+
+static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[IFA_MAX + 1];
+ struct ifaddrmsg *ifm;
+ int rc;
+
+ if (!netlink_capable(skb, CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (!netlink_capable(skb, CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ASSERT_RTNL();
+
+ rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy, extack);
+ if (rc < 0)
+ return rc;
+
+ ifm = nlmsg_data(nlh);
+ if (!tb[IFA_LOCAL])
+ return -EINVAL;
+
+ qrtr_local_nid = nla_get_u32(tb[IFA_LOCAL]);
+ 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) {
+ proto_unregister(&qrtr_proto);
+ return rc;
+ }
+
+ rc = rtnl_register_module(THIS_MODULE, PF_QIPCRTR, RTM_NEWADDR, qrtr_addr_doit, NULL, 0);
+ if (rc) {
+ sock_unregister(qrtr_family.family);
+ proto_unregister(&qrtr_proto);
+ }
+
+ return rc;
+}
+postcore_initcall(qrtr_proto_init);
+
+static void __exit qrtr_proto_fini(void)
+{
+ rtnl_unregister(PF_QIPCRTR, RTM_NEWADDR);
+ 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);
diff --git a/net/qrtr/qrtr.h b/net/qrtr/qrtr.h
new file mode 100644
index 0000000..b81e695
--- /dev/null
+++ b/net/qrtr/qrtr.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __QRTR_H_
+#define __QRTR_H_
+
+#include <linux/types.h>
+
+struct sk_buff;
+
+/* endpoint node id auto assignment */
+#define QRTR_EP_NID_AUTO (-1)
+
+/**
+ * struct qrtr_endpoint - endpoint handle
+ * @xmit: Callback for outgoing packets
+ *
+ * The socket buffer passed to the xmit function becomes owned by the endpoint
+ * driver. As such, when the driver is done with the buffer, it should
+ * call kfree_skb() on failure, or consume_skb() on success.
+ */
+struct qrtr_endpoint {
+ int (*xmit)(struct qrtr_endpoint *ep, struct sk_buff *skb);
+ /* private: not for endpoint use */
+ struct qrtr_node *node;
+};
+
+int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid);
+
+void qrtr_endpoint_unregister(struct qrtr_endpoint *ep);
+
+int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len);
+
+#endif
diff --git a/net/qrtr/smd.c b/net/qrtr/smd.c
new file mode 100644
index 0000000..9cf089b
--- /dev/null
+++ b/net/qrtr/smd.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/rpmsg.h>
+
+#include "qrtr.h"
+
+struct qrtr_smd_dev {
+ struct qrtr_endpoint ep;
+ struct rpmsg_endpoint *channel;
+ struct device *dev;
+};
+
+/* from smd to qrtr */
+static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
+ void *data, int len, void *priv, u32 addr)
+{
+ struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
+ int rc;
+
+ if (!qdev)
+ return -EAGAIN;
+
+ rc = qrtr_endpoint_post(&qdev->ep, data, len);
+ if (rc == -EINVAL) {
+ dev_err(qdev->dev, "invalid ipcrouter packet\n");
+ /* return 0 to let smd drop the packet */
+ rc = 0;
+ }
+
+ return rc;
+}
+
+/* from qrtr to smd */
+static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
+{
+ struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
+ int rc;
+
+ rc = skb_linearize(skb);
+ if (rc)
+ goto out;
+
+ rc = rpmsg_send(qdev->channel, skb->data, skb->len);
+
+out:
+ if (rc)
+ kfree_skb(skb);
+ else
+ consume_skb(skb);
+ return rc;
+}
+
+static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
+{
+ struct qrtr_smd_dev *qdev;
+ int rc;
+
+ qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
+ if (!qdev)
+ return -ENOMEM;
+
+ qdev->channel = rpdev->ept;
+ qdev->dev = &rpdev->dev;
+ qdev->ep.xmit = qcom_smd_qrtr_send;
+
+ rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
+ if (rc)
+ return rc;
+
+ dev_set_drvdata(&rpdev->dev, qdev);
+
+ dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
+
+ return 0;
+}
+
+static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
+{
+ struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
+
+ qrtr_endpoint_unregister(&qdev->ep);
+
+ dev_set_drvdata(&rpdev->dev, NULL);
+}
+
+static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
+ { "IPCRTR" },
+ {}
+};
+
+static struct rpmsg_driver qcom_smd_qrtr_driver = {
+ .probe = qcom_smd_qrtr_probe,
+ .remove = qcom_smd_qrtr_remove,
+ .callback = qcom_smd_qrtr_callback,
+ .id_table = qcom_smd_qrtr_smd_match,
+ .drv = {
+ .name = "qcom_smd_qrtr",
+ },
+};
+
+module_rpmsg_driver(qcom_smd_qrtr_driver);
+
+MODULE_ALIAS("rpmsg:IPCRTR");
+MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
+MODULE_LICENSE("GPL v2");
diff --git a/net/qrtr/tun.c b/net/qrtr/tun.c
new file mode 100644
index 0000000..ccff1e5
--- /dev/null
+++ b/net/qrtr/tun.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2018, Linaro Ltd */
+
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/skbuff.h>
+#include <linux/uaccess.h>
+
+#include "qrtr.h"
+
+struct qrtr_tun {
+ struct qrtr_endpoint ep;
+
+ struct sk_buff_head queue;
+ wait_queue_head_t readq;
+};
+
+static int qrtr_tun_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
+{
+ struct qrtr_tun *tun = container_of(ep, struct qrtr_tun, ep);
+
+ skb_queue_tail(&tun->queue, skb);
+
+ /* wake up any blocking processes, waiting for new data */
+ wake_up_interruptible(&tun->readq);
+
+ return 0;
+}
+
+static int qrtr_tun_open(struct inode *inode, struct file *filp)
+{
+ struct qrtr_tun *tun;
+
+ tun = kzalloc(sizeof(*tun), GFP_KERNEL);
+ if (!tun)
+ return -ENOMEM;
+
+ skb_queue_head_init(&tun->queue);
+ init_waitqueue_head(&tun->readq);
+
+ tun->ep.xmit = qrtr_tun_send;
+
+ filp->private_data = tun;
+
+ return qrtr_endpoint_register(&tun->ep, QRTR_EP_NID_AUTO);
+}
+
+static ssize_t qrtr_tun_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *filp = iocb->ki_filp;
+ struct qrtr_tun *tun = filp->private_data;
+ struct sk_buff *skb;
+ int count;
+
+ while (!(skb = skb_dequeue(&tun->queue))) {
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ /* Wait until we get data or the endpoint goes away */
+ if (wait_event_interruptible(tun->readq,
+ !skb_queue_empty(&tun->queue)))
+ return -ERESTARTSYS;
+ }
+
+ count = min_t(size_t, iov_iter_count(to), skb->len);
+ if (copy_to_iter(skb->data, count, to) != count)
+ count = -EFAULT;
+
+ kfree_skb(skb);
+
+ return count;
+}
+
+static ssize_t qrtr_tun_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *filp = iocb->ki_filp;
+ struct qrtr_tun *tun = filp->private_data;
+ size_t len = iov_iter_count(from);
+ ssize_t ret;
+ void *kbuf;
+
+ kbuf = kzalloc(len, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (!copy_from_iter_full(kbuf, len, from))
+ return -EFAULT;
+
+ ret = qrtr_endpoint_post(&tun->ep, kbuf, len);
+
+ return ret < 0 ? ret : len;
+}
+
+static __poll_t qrtr_tun_poll(struct file *filp, poll_table *wait)
+{
+ struct qrtr_tun *tun = filp->private_data;
+ __poll_t mask = 0;
+
+ poll_wait(filp, &tun->readq, wait);
+
+ if (!skb_queue_empty(&tun->queue))
+ mask |= EPOLLIN | EPOLLRDNORM;
+
+ return mask;
+}
+
+static int qrtr_tun_release(struct inode *inode, struct file *filp)
+{
+ struct qrtr_tun *tun = filp->private_data;
+ struct sk_buff *skb;
+
+ qrtr_endpoint_unregister(&tun->ep);
+
+ /* Discard all SKBs */
+ while (!skb_queue_empty(&tun->queue)) {
+ skb = skb_dequeue(&tun->queue);
+ kfree_skb(skb);
+ }
+
+ kfree(tun);
+
+ return 0;
+}
+
+static const struct file_operations qrtr_tun_ops = {
+ .owner = THIS_MODULE,
+ .open = qrtr_tun_open,
+ .poll = qrtr_tun_poll,
+ .read_iter = qrtr_tun_read_iter,
+ .write_iter = qrtr_tun_write_iter,
+ .release = qrtr_tun_release,
+};
+
+static struct miscdevice qrtr_tun_miscdev = {
+ MISC_DYNAMIC_MINOR,
+ "qrtr-tun",
+ &qrtr_tun_ops,
+};
+
+static int __init qrtr_tun_init(void)
+{
+ int ret;
+
+ ret = misc_register(&qrtr_tun_miscdev);
+ if (ret)
+ pr_err("failed to register Qualcomm IPC Router tun device\n");
+
+ return ret;
+}
+
+static void __exit qrtr_tun_exit(void)
+{
+ misc_deregister(&qrtr_tun_miscdev);
+}
+
+module_init(qrtr_tun_init);
+module_exit(qrtr_tun_exit);
+
+MODULE_DESCRIPTION("Qualcomm IPC Router TUN device");
+MODULE_LICENSE("GPL v2");