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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/qrtr
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/qrtr')
-rw-r--r--net/qrtr/Kconfig38
-rw-r--r--net/qrtr/Makefile10
-rw-r--r--net/qrtr/af_qrtr.c1324
-rw-r--r--net/qrtr/mhi.c137
-rw-r--r--net/qrtr/ns.c830
-rw-r--r--net/qrtr/qrtr.h36
-rw-r--r--net/qrtr/smd.c111
-rw-r--r--net/qrtr/tun.c176
8 files changed, 2662 insertions, 0 deletions
diff --git a/net/qrtr/Kconfig b/net/qrtr/Kconfig
new file mode 100644
index 000000000..b4020b847
--- /dev/null
+++ b/net/qrtr/Kconfig
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Qualcomm IPC Router configuration
+#
+
+config QRTR
+ tristate "Qualcomm IPC Router support"
+ 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.
+
+config QRTR_MHI
+ tristate "MHI IPC Router channels"
+ depends on MHI_BUS
+ help
+ Say Y here to support MHI based ipcrouter channels. MHI is the
+ transport used for communicating to external modems.
+
+endif # QRTR
diff --git a/net/qrtr/Makefile b/net/qrtr/Makefile
new file mode 100644
index 000000000..8e0605f88
--- /dev/null
+++ b/net/qrtr/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_QRTR) += qrtr.o
+qrtr-y := af_qrtr.o ns.o
+
+obj-$(CONFIG_QRTR_SMD) += qrtr-smd.o
+qrtr-smd-y := smd.o
+obj-$(CONFIG_QRTR_TUN) += qrtr-tun.o
+qrtr-tun-y := tun.o
+obj-$(CONFIG_QRTR_MHI) += qrtr-mhi.o
+qrtr-mhi-y := mhi.o
diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
new file mode 100644
index 000000000..76f0434d3
--- /dev/null
+++ b/net/qrtr/af_qrtr.c
@@ -0,0 +1,1324 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ */
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/qrtr.h>
+#include <linux/termios.h> /* For TIOCINQ/OUTQ */
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+
+#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
+#define QRTR_EPH_PORT_RANGE \
+ XA_LIMIT(QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET)
+
+/**
+ * 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_ATOMIC);
+static DEFINE_SPINLOCK(qrtr_nodes_lock);
+/* broadcast list */
+static LIST_HEAD(qrtr_all_nodes);
+/* lock for qrtr_all_nodes and node reference */
+static DEFINE_MUTEX(qrtr_node_lock);
+
+/* local port allocation management */
+static DEFINE_XARRAY_ALLOC(qrtr_ports);
+
+/**
+ * struct qrtr_node - endpoint node
+ * @ep_lock: lock for endpoint management and callbacks
+ * @ep: endpoint
+ * @ref: reference count for node
+ * @nid: node id
+ * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port
+ * @qrtr_tx_lock: lock for qrtr_tx_flow inserts
+ * @rx_queue: receive queue
+ * @item: list item for broadcast list
+ */
+struct qrtr_node {
+ struct mutex ep_lock;
+ struct qrtr_endpoint *ep;
+ struct kref ref;
+ unsigned int nid;
+
+ struct radix_tree_root qrtr_tx_flow;
+ struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */
+
+ struct sk_buff_head rx_queue;
+ struct list_head item;
+};
+
+/**
+ * struct qrtr_tx_flow - tx flow control
+ * @resume_tx: waiters for a resume tx from the remote
+ * @pending: number of waiting senders
+ * @tx_failed: indicates that a message with confirm_rx flag was lost
+ */
+struct qrtr_tx_flow {
+ struct wait_queue_head resume_tx;
+ int pending;
+ int tx_failed;
+};
+
+#define QRTR_TX_FLOW_HIGH 10
+#define QRTR_TX_FLOW_LOW 5
+
+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);
+static struct qrtr_sock *qrtr_port_lookup(int port);
+static void qrtr_port_put(struct qrtr_sock *ipc);
+
+/* 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);
+ struct radix_tree_iter iter;
+ struct qrtr_tx_flow *flow;
+ unsigned long flags;
+ void __rcu **slot;
+
+ spin_lock_irqsave(&qrtr_nodes_lock, flags);
+ /* If the node is a bridge for other nodes, there are possibly
+ * multiple entries pointing to our released node, delete them all.
+ */
+ radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
+ if (*slot == node)
+ radix_tree_iter_delete(&qrtr_nodes, &iter, slot);
+ }
+ spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
+
+ list_del(&node->item);
+ mutex_unlock(&qrtr_node_lock);
+
+ skb_queue_purge(&node->rx_queue);
+
+ /* Free tx flow counters */
+ radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
+ flow = *slot;
+ radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
+ kfree(flow);
+ }
+ 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);
+}
+
+/**
+ * qrtr_tx_resume() - reset flow control counter
+ * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
+ * @skb: resume_tx packet
+ */
+static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb)
+{
+ struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data;
+ u64 remote_node = le32_to_cpu(pkt->client.node);
+ u32 remote_port = le32_to_cpu(pkt->client.port);
+ struct qrtr_tx_flow *flow;
+ unsigned long key;
+
+ key = remote_node << 32 | remote_port;
+
+ rcu_read_lock();
+ flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
+ rcu_read_unlock();
+ if (flow) {
+ spin_lock(&flow->resume_tx.lock);
+ flow->pending = 0;
+ spin_unlock(&flow->resume_tx.lock);
+ wake_up_interruptible_all(&flow->resume_tx);
+ }
+
+ consume_skb(skb);
+}
+
+/**
+ * qrtr_tx_wait() - flow control for outgoing packets
+ * @node: qrtr_node that the packet is to be send to
+ * @dest_node: node id of the destination
+ * @dest_port: port number of the destination
+ * @type: type of message
+ *
+ * The flow control scheme is based around the low and high "watermarks". When
+ * the low watermark is passed the confirm_rx flag is set on the outgoing
+ * message, which will trigger the remote to send a control message of the type
+ * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
+ * further transmision should be paused.
+ *
+ * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
+ */
+static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
+ int type)
+{
+ unsigned long key = (u64)dest_node << 32 | dest_port;
+ struct qrtr_tx_flow *flow;
+ int confirm_rx = 0;
+ int ret;
+
+ /* Never set confirm_rx on non-data packets */
+ if (type != QRTR_TYPE_DATA)
+ return 0;
+
+ mutex_lock(&node->qrtr_tx_lock);
+ flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
+ if (!flow) {
+ flow = kzalloc(sizeof(*flow), GFP_KERNEL);
+ if (flow) {
+ init_waitqueue_head(&flow->resume_tx);
+ if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
+ kfree(flow);
+ flow = NULL;
+ }
+ }
+ }
+ mutex_unlock(&node->qrtr_tx_lock);
+
+ /* Set confirm_rx if we where unable to find and allocate a flow */
+ if (!flow)
+ return 1;
+
+ spin_lock_irq(&flow->resume_tx.lock);
+ ret = wait_event_interruptible_locked_irq(flow->resume_tx,
+ flow->pending < QRTR_TX_FLOW_HIGH ||
+ flow->tx_failed ||
+ !node->ep);
+ if (ret < 0) {
+ confirm_rx = ret;
+ } else if (!node->ep) {
+ confirm_rx = -EPIPE;
+ } else if (flow->tx_failed) {
+ flow->tx_failed = 0;
+ confirm_rx = 1;
+ } else {
+ flow->pending++;
+ confirm_rx = flow->pending == QRTR_TX_FLOW_LOW;
+ }
+ spin_unlock_irq(&flow->resume_tx.lock);
+
+ return confirm_rx;
+}
+
+/**
+ * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
+ * @node: qrtr_node that the packet is to be send to
+ * @dest_node: node id of the destination
+ * @dest_port: port number of the destination
+ *
+ * Signal that the transmission of a message with confirm_rx flag failed. The
+ * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
+ * at which point transmission would stall forever waiting for the resume TX
+ * message associated with the dropped confirm_rx message.
+ * Work around this by marking the flow as having a failed transmission and
+ * cause the next transmission attempt to be sent with the confirm_rx.
+ */
+static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node,
+ int dest_port)
+{
+ unsigned long key = (u64)dest_node << 32 | dest_port;
+ struct qrtr_tx_flow *flow;
+
+ rcu_read_lock();
+ flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
+ rcu_read_unlock();
+ if (flow) {
+ spin_lock_irq(&flow->resume_tx.lock);
+ flow->tx_failed = 1;
+ spin_unlock_irq(&flow->resume_tx.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, confirm_rx;
+
+ confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type);
+ if (confirm_rx < 0) {
+ kfree_skb(skb);
+ return confirm_rx;
+ }
+
+ 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_PORT_CTRL);
+ } 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 = !!confirm_rx;
+
+ rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr));
+
+ if (!rc) {
+ mutex_lock(&node->ep_lock);
+ rc = -ENODEV;
+ if (node->ep)
+ rc = node->ep->xmit(node->ep, skb);
+ else
+ kfree_skb(skb);
+ mutex_unlock(&node->ep_lock);
+ }
+ /* Need to ensure that a subsequent message carries the otherwise lost
+ * confirm_rx flag if we dropped this one */
+ if (rc && confirm_rx)
+ qrtr_tx_flow_failed(node, to->sq_node, to->sq_port);
+
+ 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;
+ unsigned long flags;
+
+ mutex_lock(&qrtr_node_lock);
+ spin_lock_irqsave(&qrtr_nodes_lock, flags);
+ node = radix_tree_lookup(&qrtr_nodes, nid);
+ node = qrtr_node_acquire(node);
+ spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
+ 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)
+{
+ unsigned long flags;
+
+ if (nid == QRTR_EP_NID_AUTO)
+ return;
+
+ spin_lock_irqsave(&qrtr_nodes_lock, flags);
+ radix_tree_insert(&qrtr_nodes, nid, node);
+ if (node->nid == QRTR_EP_NID_AUTO)
+ node->nid = nid;
+ spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
+}
+
+/**
+ * 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 qrtr_sock *ipc;
+ struct sk_buff *skb;
+ struct qrtr_cb *cb;
+ size_t size;
+ unsigned int ver;
+ size_t hdrlen;
+
+ if (len == 0 || len & 3)
+ return -EINVAL;
+
+ skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
+ 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:
+ if (len < sizeof(*v1))
+ goto err;
+ 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:
+ if (len < sizeof(*v2))
+ goto err;
+ 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 (!size || len != ALIGN(size, 4) + hdrlen)
+ goto err;
+
+ if ((cb->type == QRTR_TYPE_NEW_SERVER ||
+ cb->type == QRTR_TYPE_RESUME_TX) &&
+ size < sizeof(struct qrtr_ctrl_pkt))
+ goto err;
+
+ if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
+ cb->type != QRTR_TYPE_RESUME_TX)
+ goto err;
+
+ skb_put_data(skb, data + hdrlen, size);
+
+ qrtr_node_assign(node, cb->src_node);
+
+ if (cb->type == QRTR_TYPE_NEW_SERVER) {
+ /* Remote node endpoint can bridge other distant nodes */
+ const struct qrtr_ctrl_pkt *pkt;
+
+ pkt = data + hdrlen;
+ qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
+ }
+
+ if (cb->type == QRTR_TYPE_RESUME_TX) {
+ qrtr_tx_resume(node, skb);
+ } else {
+ ipc = qrtr_port_lookup(cb->dst_port);
+ if (!ipc)
+ goto err;
+
+ if (sock_queue_rcv_skb(&ipc->sk, skb)) {
+ qrtr_port_put(ipc);
+ goto err;
+ }
+
+ 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
+ *
+ * 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, &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);
diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
new file mode 100644
index 000000000..9ced13c06
--- /dev/null
+++ b/net/qrtr/mhi.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/mhi.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+
+#include "qrtr.h"
+
+struct qrtr_mhi_dev {
+ struct qrtr_endpoint ep;
+ struct mhi_device *mhi_dev;
+ struct device *dev;
+};
+
+/* From MHI to QRTR */
+static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
+ struct mhi_result *mhi_res)
+{
+ struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
+ int rc;
+
+ if (!qdev || mhi_res->transaction_status)
+ return;
+
+ rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
+ mhi_res->bytes_xferd);
+ if (rc == -EINVAL)
+ dev_err(qdev->dev, "invalid ipcrouter packet\n");
+}
+
+/* From QRTR to MHI */
+static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
+ struct mhi_result *mhi_res)
+{
+ struct sk_buff *skb = mhi_res->buf_addr;
+
+ if (skb->sk)
+ sock_put(skb->sk);
+ consume_skb(skb);
+}
+
+/* Send data over MHI */
+static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
+{
+ struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
+ int rc;
+
+ if (skb->sk)
+ sock_hold(skb->sk);
+
+ rc = skb_linearize(skb);
+ if (rc)
+ goto free_skb;
+
+ rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
+ MHI_EOT);
+ if (rc)
+ goto free_skb;
+
+ return rc;
+
+free_skb:
+ if (skb->sk)
+ sock_put(skb->sk);
+ kfree_skb(skb);
+
+ return rc;
+}
+
+static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
+ const struct mhi_device_id *id)
+{
+ struct qrtr_mhi_dev *qdev;
+ int rc;
+
+ qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
+ if (!qdev)
+ return -ENOMEM;
+
+ qdev->mhi_dev = mhi_dev;
+ qdev->dev = &mhi_dev->dev;
+ qdev->ep.xmit = qcom_mhi_qrtr_send;
+
+ dev_set_drvdata(&mhi_dev->dev, qdev);
+ rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
+ if (rc)
+ return rc;
+
+ /* start channels */
+ rc = mhi_prepare_for_transfer_autoqueue(mhi_dev);
+ if (rc) {
+ qrtr_endpoint_unregister(&qdev->ep);
+ return rc;
+ }
+
+ dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");
+
+ return 0;
+}
+
+static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
+{
+ struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
+
+ qrtr_endpoint_unregister(&qdev->ep);
+ mhi_unprepare_from_transfer(mhi_dev);
+ dev_set_drvdata(&mhi_dev->dev, NULL);
+}
+
+static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
+ { .chan = "IPCR" },
+ {}
+};
+MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);
+
+static struct mhi_driver qcom_mhi_qrtr_driver = {
+ .probe = qcom_mhi_qrtr_probe,
+ .remove = qcom_mhi_qrtr_remove,
+ .dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
+ .ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
+ .id_table = qcom_mhi_qrtr_id_table,
+ .driver = {
+ .name = "qcom_mhi_qrtr",
+ },
+};
+
+module_mhi_driver(qcom_mhi_qrtr_driver);
+
+MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
+MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
+MODULE_LICENSE("GPL v2");
diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
new file mode 100644
index 000000000..4a13b9f7a
--- /dev/null
+++ b/net/qrtr/ns.c
@@ -0,0 +1,830 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2020, Linaro Ltd.
+ */
+
+#include <linux/module.h>
+#include <linux/qrtr.h>
+#include <linux/workqueue.h>
+#include <net/sock.h>
+
+#include "qrtr.h"
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/qrtr.h>
+
+static RADIX_TREE(nodes, GFP_KERNEL);
+
+static struct {
+ struct socket *sock;
+ struct sockaddr_qrtr bcast_sq;
+ struct list_head lookups;
+ struct workqueue_struct *workqueue;
+ struct work_struct work;
+ int local_node;
+} qrtr_ns;
+
+static const char * const qrtr_ctrl_pkt_strings[] = {
+ [QRTR_TYPE_HELLO] = "hello",
+ [QRTR_TYPE_BYE] = "bye",
+ [QRTR_TYPE_NEW_SERVER] = "new-server",
+ [QRTR_TYPE_DEL_SERVER] = "del-server",
+ [QRTR_TYPE_DEL_CLIENT] = "del-client",
+ [QRTR_TYPE_RESUME_TX] = "resume-tx",
+ [QRTR_TYPE_EXIT] = "exit",
+ [QRTR_TYPE_PING] = "ping",
+ [QRTR_TYPE_NEW_LOOKUP] = "new-lookup",
+ [QRTR_TYPE_DEL_LOOKUP] = "del-lookup",
+};
+
+struct qrtr_server_filter {
+ unsigned int service;
+ unsigned int instance;
+ unsigned int ifilter;
+};
+
+struct qrtr_lookup {
+ unsigned int service;
+ unsigned int instance;
+
+ struct sockaddr_qrtr sq;
+ struct list_head li;
+};
+
+struct qrtr_server {
+ unsigned int service;
+ unsigned int instance;
+
+ unsigned int node;
+ unsigned int port;
+
+ struct list_head qli;
+};
+
+struct qrtr_node {
+ unsigned int id;
+ struct radix_tree_root servers;
+};
+
+static struct qrtr_node *node_get(unsigned int node_id)
+{
+ struct qrtr_node *node;
+
+ node = radix_tree_lookup(&nodes, node_id);
+ if (node)
+ return node;
+
+ /* If node didn't exist, allocate and insert it to the tree */
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node)
+ return NULL;
+
+ node->id = node_id;
+
+ if (radix_tree_insert(&nodes, node_id, node)) {
+ kfree(node);
+ return NULL;
+ }
+
+ return node;
+}
+
+static int server_match(const struct qrtr_server *srv,
+ const struct qrtr_server_filter *f)
+{
+ unsigned int ifilter = f->ifilter;
+
+ if (f->service != 0 && srv->service != f->service)
+ return 0;
+ if (!ifilter && f->instance)
+ ifilter = ~0;
+
+ return (srv->instance & ifilter) == f->instance;
+}
+
+static int service_announce_new(struct sockaddr_qrtr *dest,
+ struct qrtr_server *srv)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct msghdr msg = { };
+ struct kvec iv;
+
+ trace_qrtr_ns_service_announce_new(srv->service, srv->instance,
+ srv->node, srv->port);
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
+ pkt.server.service = cpu_to_le32(srv->service);
+ pkt.server.instance = cpu_to_le32(srv->instance);
+ pkt.server.node = cpu_to_le32(srv->node);
+ pkt.server.port = cpu_to_le32(srv->port);
+
+ msg.msg_name = (struct sockaddr *)dest;
+ msg.msg_namelen = sizeof(*dest);
+
+ return kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+}
+
+static int service_announce_del(struct sockaddr_qrtr *dest,
+ struct qrtr_server *srv)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct msghdr msg = { };
+ struct kvec iv;
+ int ret;
+
+ trace_qrtr_ns_service_announce_del(srv->service, srv->instance,
+ srv->node, srv->port);
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_SERVER);
+ pkt.server.service = cpu_to_le32(srv->service);
+ pkt.server.instance = cpu_to_le32(srv->instance);
+ pkt.server.node = cpu_to_le32(srv->node);
+ pkt.server.port = cpu_to_le32(srv->port);
+
+ msg.msg_name = (struct sockaddr *)dest;
+ msg.msg_namelen = sizeof(*dest);
+
+ ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0)
+ pr_err("failed to announce del service\n");
+
+ return ret;
+}
+
+static void lookup_notify(struct sockaddr_qrtr *to, struct qrtr_server *srv,
+ bool new)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct msghdr msg = { };
+ struct kvec iv;
+ int ret;
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = new ? cpu_to_le32(QRTR_TYPE_NEW_SERVER) :
+ cpu_to_le32(QRTR_TYPE_DEL_SERVER);
+ if (srv) {
+ pkt.server.service = cpu_to_le32(srv->service);
+ pkt.server.instance = cpu_to_le32(srv->instance);
+ pkt.server.node = cpu_to_le32(srv->node);
+ pkt.server.port = cpu_to_le32(srv->port);
+ }
+
+ msg.msg_name = (struct sockaddr *)to;
+ msg.msg_namelen = sizeof(*to);
+
+ ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0)
+ pr_err("failed to send lookup notification\n");
+}
+
+static int announce_servers(struct sockaddr_qrtr *sq)
+{
+ struct radix_tree_iter iter;
+ struct qrtr_server *srv;
+ struct qrtr_node *node;
+ void __rcu **slot;
+ int ret;
+
+ node = node_get(qrtr_ns.local_node);
+ if (!node)
+ return 0;
+
+ rcu_read_lock();
+ /* Announce the list of servers registered in this node */
+ radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
+ srv = radix_tree_deref_slot(slot);
+ if (!srv)
+ continue;
+ if (radix_tree_deref_retry(srv)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+ slot = radix_tree_iter_resume(slot, &iter);
+ rcu_read_unlock();
+
+ ret = service_announce_new(sq, srv);
+ if (ret < 0) {
+ pr_err("failed to announce new service\n");
+ return ret;
+ }
+
+ rcu_read_lock();
+ }
+
+ rcu_read_unlock();
+
+ return 0;
+}
+
+static struct qrtr_server *server_add(unsigned int service,
+ unsigned int instance,
+ unsigned int node_id,
+ unsigned int port)
+{
+ struct qrtr_server *srv;
+ struct qrtr_server *old;
+ struct qrtr_node *node;
+
+ if (!service || !port)
+ return NULL;
+
+ srv = kzalloc(sizeof(*srv), GFP_KERNEL);
+ if (!srv)
+ return NULL;
+
+ srv->service = service;
+ srv->instance = instance;
+ srv->node = node_id;
+ srv->port = port;
+
+ node = node_get(node_id);
+ if (!node)
+ goto err;
+
+ /* Delete the old server on the same port */
+ old = radix_tree_lookup(&node->servers, port);
+ if (old) {
+ radix_tree_delete(&node->servers, port);
+ kfree(old);
+ }
+
+ radix_tree_insert(&node->servers, port, srv);
+
+ trace_qrtr_ns_server_add(srv->service, srv->instance,
+ srv->node, srv->port);
+
+ return srv;
+
+err:
+ kfree(srv);
+ return NULL;
+}
+
+static int server_del(struct qrtr_node *node, unsigned int port, bool bcast)
+{
+ struct qrtr_lookup *lookup;
+ struct qrtr_server *srv;
+ struct list_head *li;
+
+ srv = radix_tree_lookup(&node->servers, port);
+ if (!srv)
+ return -ENOENT;
+
+ radix_tree_delete(&node->servers, port);
+
+ /* Broadcast the removal of local servers */
+ if (srv->node == qrtr_ns.local_node && bcast)
+ service_announce_del(&qrtr_ns.bcast_sq, srv);
+
+ /* Announce the service's disappearance to observers */
+ list_for_each(li, &qrtr_ns.lookups) {
+ lookup = container_of(li, struct qrtr_lookup, li);
+ if (lookup->service && lookup->service != srv->service)
+ continue;
+ if (lookup->instance && lookup->instance != srv->instance)
+ continue;
+
+ lookup_notify(&lookup->sq, srv, false);
+ }
+
+ kfree(srv);
+
+ return 0;
+}
+
+static int say_hello(struct sockaddr_qrtr *dest)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct msghdr msg = { };
+ struct kvec iv;
+ int ret;
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_HELLO);
+
+ msg.msg_name = (struct sockaddr *)dest;
+ msg.msg_namelen = sizeof(*dest);
+
+ ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0)
+ pr_err("failed to send hello msg\n");
+
+ return ret;
+}
+
+/* Announce the list of servers registered on the local node */
+static int ctrl_cmd_hello(struct sockaddr_qrtr *sq)
+{
+ int ret;
+
+ ret = say_hello(sq);
+ if (ret < 0)
+ return ret;
+
+ return announce_servers(sq);
+}
+
+static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
+{
+ struct qrtr_node *local_node;
+ struct radix_tree_iter iter;
+ struct qrtr_ctrl_pkt pkt;
+ struct qrtr_server *srv;
+ struct sockaddr_qrtr sq;
+ struct msghdr msg = { };
+ struct qrtr_node *node;
+ void __rcu **slot;
+ struct kvec iv;
+ int ret;
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ node = node_get(from->sq_node);
+ if (!node)
+ return 0;
+
+ rcu_read_lock();
+ /* Advertise removal of this client to all servers of remote node */
+ radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
+ srv = radix_tree_deref_slot(slot);
+ if (!srv)
+ continue;
+ if (radix_tree_deref_retry(srv)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+ slot = radix_tree_iter_resume(slot, &iter);
+ rcu_read_unlock();
+ server_del(node, srv->port, true);
+ rcu_read_lock();
+ }
+ rcu_read_unlock();
+
+ /* Advertise the removal of this client to all local servers */
+ local_node = node_get(qrtr_ns.local_node);
+ if (!local_node)
+ return 0;
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_BYE);
+ pkt.client.node = cpu_to_le32(from->sq_node);
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
+ srv = radix_tree_deref_slot(slot);
+ if (!srv)
+ continue;
+ if (radix_tree_deref_retry(srv)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+ slot = radix_tree_iter_resume(slot, &iter);
+ rcu_read_unlock();
+
+ sq.sq_family = AF_QIPCRTR;
+ sq.sq_node = srv->node;
+ sq.sq_port = srv->port;
+
+ msg.msg_name = (struct sockaddr *)&sq;
+ msg.msg_namelen = sizeof(sq);
+
+ ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0) {
+ pr_err("failed to send bye cmd\n");
+ return ret;
+ }
+ rcu_read_lock();
+ }
+
+ rcu_read_unlock();
+
+ return 0;
+}
+
+static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
+ unsigned int node_id, unsigned int port)
+{
+ struct qrtr_node *local_node;
+ struct radix_tree_iter iter;
+ struct qrtr_lookup *lookup;
+ struct qrtr_ctrl_pkt pkt;
+ struct msghdr msg = { };
+ struct qrtr_server *srv;
+ struct sockaddr_qrtr sq;
+ struct qrtr_node *node;
+ struct list_head *tmp;
+ struct list_head *li;
+ void __rcu **slot;
+ struct kvec iv;
+ int ret;
+
+ iv.iov_base = &pkt;
+ iv.iov_len = sizeof(pkt);
+
+ /* Don't accept spoofed messages */
+ if (from->sq_node != node_id)
+ return -EINVAL;
+
+ /* Local DEL_CLIENT messages comes from the port being closed */
+ if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
+ return -EINVAL;
+
+ /* Remove any lookups by this client */
+ list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
+ lookup = container_of(li, struct qrtr_lookup, li);
+ if (lookup->sq.sq_node != node_id)
+ continue;
+ if (lookup->sq.sq_port != port)
+ continue;
+
+ list_del(&lookup->li);
+ kfree(lookup);
+ }
+
+ /* Remove the server belonging to this port but don't broadcast
+ * DEL_SERVER. Neighbours would've already removed the server belonging
+ * to this port due to the DEL_CLIENT broadcast from qrtr_port_remove().
+ */
+ node = node_get(node_id);
+ if (node)
+ server_del(node, port, false);
+
+ /* Advertise the removal of this client to all local servers */
+ local_node = node_get(qrtr_ns.local_node);
+ if (!local_node)
+ return 0;
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
+ pkt.client.node = cpu_to_le32(node_id);
+ pkt.client.port = cpu_to_le32(port);
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
+ srv = radix_tree_deref_slot(slot);
+ if (!srv)
+ continue;
+ if (radix_tree_deref_retry(srv)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+ slot = radix_tree_iter_resume(slot, &iter);
+ rcu_read_unlock();
+
+ sq.sq_family = AF_QIPCRTR;
+ sq.sq_node = srv->node;
+ sq.sq_port = srv->port;
+
+ msg.msg_name = (struct sockaddr *)&sq;
+ msg.msg_namelen = sizeof(sq);
+
+ ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0) {
+ pr_err("failed to send del client cmd\n");
+ return ret;
+ }
+ rcu_read_lock();
+ }
+
+ rcu_read_unlock();
+
+ return 0;
+}
+
+static int ctrl_cmd_new_server(struct sockaddr_qrtr *from,
+ unsigned int service, unsigned int instance,
+ unsigned int node_id, unsigned int port)
+{
+ struct qrtr_lookup *lookup;
+ struct qrtr_server *srv;
+ struct list_head *li;
+ int ret = 0;
+
+ /* Ignore specified node and port for local servers */
+ if (from->sq_node == qrtr_ns.local_node) {
+ node_id = from->sq_node;
+ port = from->sq_port;
+ }
+
+ srv = server_add(service, instance, node_id, port);
+ if (!srv)
+ return -EINVAL;
+
+ if (srv->node == qrtr_ns.local_node) {
+ ret = service_announce_new(&qrtr_ns.bcast_sq, srv);
+ if (ret < 0) {
+ pr_err("failed to announce new service\n");
+ return ret;
+ }
+ }
+
+ /* Notify any potential lookups about the new server */
+ list_for_each(li, &qrtr_ns.lookups) {
+ lookup = container_of(li, struct qrtr_lookup, li);
+ if (lookup->service && lookup->service != service)
+ continue;
+ if (lookup->instance && lookup->instance != instance)
+ continue;
+
+ lookup_notify(&lookup->sq, srv, true);
+ }
+
+ return ret;
+}
+
+static int ctrl_cmd_del_server(struct sockaddr_qrtr *from,
+ unsigned int service, unsigned int instance,
+ unsigned int node_id, unsigned int port)
+{
+ struct qrtr_node *node;
+
+ /* Ignore specified node and port for local servers*/
+ if (from->sq_node == qrtr_ns.local_node) {
+ node_id = from->sq_node;
+ port = from->sq_port;
+ }
+
+ /* Local servers may only unregister themselves */
+ if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
+ return -EINVAL;
+
+ node = node_get(node_id);
+ if (!node)
+ return -ENOENT;
+
+ server_del(node, port, true);
+
+ return 0;
+}
+
+static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from,
+ unsigned int service, unsigned int instance)
+{
+ struct radix_tree_iter node_iter;
+ struct qrtr_server_filter filter;
+ struct radix_tree_iter srv_iter;
+ struct qrtr_lookup *lookup;
+ struct qrtr_node *node;
+ void __rcu **node_slot;
+ void __rcu **srv_slot;
+
+ /* Accept only local observers */
+ if (from->sq_node != qrtr_ns.local_node)
+ return -EINVAL;
+
+ lookup = kzalloc(sizeof(*lookup), GFP_KERNEL);
+ if (!lookup)
+ return -ENOMEM;
+
+ lookup->sq = *from;
+ lookup->service = service;
+ lookup->instance = instance;
+ list_add_tail(&lookup->li, &qrtr_ns.lookups);
+
+ memset(&filter, 0, sizeof(filter));
+ filter.service = service;
+ filter.instance = instance;
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(node_slot, &nodes, &node_iter, 0) {
+ node = radix_tree_deref_slot(node_slot);
+ if (!node)
+ continue;
+ if (radix_tree_deref_retry(node)) {
+ node_slot = radix_tree_iter_retry(&node_iter);
+ continue;
+ }
+ node_slot = radix_tree_iter_resume(node_slot, &node_iter);
+
+ radix_tree_for_each_slot(srv_slot, &node->servers,
+ &srv_iter, 0) {
+ struct qrtr_server *srv;
+
+ srv = radix_tree_deref_slot(srv_slot);
+ if (!srv)
+ continue;
+ if (radix_tree_deref_retry(srv)) {
+ srv_slot = radix_tree_iter_retry(&srv_iter);
+ continue;
+ }
+
+ if (!server_match(srv, &filter))
+ continue;
+
+ srv_slot = radix_tree_iter_resume(srv_slot, &srv_iter);
+
+ rcu_read_unlock();
+ lookup_notify(from, srv, true);
+ rcu_read_lock();
+ }
+ }
+ rcu_read_unlock();
+
+ /* Empty notification, to indicate end of listing */
+ lookup_notify(from, NULL, true);
+
+ return 0;
+}
+
+static void ctrl_cmd_del_lookup(struct sockaddr_qrtr *from,
+ unsigned int service, unsigned int instance)
+{
+ struct qrtr_lookup *lookup;
+ struct list_head *tmp;
+ struct list_head *li;
+
+ list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
+ lookup = container_of(li, struct qrtr_lookup, li);
+ if (lookup->sq.sq_node != from->sq_node)
+ continue;
+ if (lookup->sq.sq_port != from->sq_port)
+ continue;
+ if (lookup->service != service)
+ continue;
+ if (lookup->instance && lookup->instance != instance)
+ continue;
+
+ list_del(&lookup->li);
+ kfree(lookup);
+ }
+}
+
+static void qrtr_ns_worker(struct work_struct *work)
+{
+ const struct qrtr_ctrl_pkt *pkt;
+ size_t recv_buf_size = 4096;
+ struct sockaddr_qrtr sq;
+ struct msghdr msg = { };
+ unsigned int cmd;
+ ssize_t msglen;
+ void *recv_buf;
+ struct kvec iv;
+ int ret;
+
+ msg.msg_name = (struct sockaddr *)&sq;
+ msg.msg_namelen = sizeof(sq);
+
+ recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
+ if (!recv_buf)
+ return;
+
+ for (;;) {
+ iv.iov_base = recv_buf;
+ iv.iov_len = recv_buf_size;
+
+ msglen = kernel_recvmsg(qrtr_ns.sock, &msg, &iv, 1,
+ iv.iov_len, MSG_DONTWAIT);
+
+ if (msglen == -EAGAIN)
+ break;
+
+ if (msglen < 0) {
+ pr_err("error receiving packet: %zd\n", msglen);
+ break;
+ }
+
+ pkt = recv_buf;
+ cmd = le32_to_cpu(pkt->cmd);
+ if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&
+ qrtr_ctrl_pkt_strings[cmd])
+ trace_qrtr_ns_message(qrtr_ctrl_pkt_strings[cmd],
+ sq.sq_node, sq.sq_port);
+
+ ret = 0;
+ switch (cmd) {
+ case QRTR_TYPE_HELLO:
+ ret = ctrl_cmd_hello(&sq);
+ break;
+ case QRTR_TYPE_BYE:
+ ret = ctrl_cmd_bye(&sq);
+ break;
+ case QRTR_TYPE_DEL_CLIENT:
+ ret = ctrl_cmd_del_client(&sq,
+ le32_to_cpu(pkt->client.node),
+ le32_to_cpu(pkt->client.port));
+ break;
+ case QRTR_TYPE_NEW_SERVER:
+ ret = ctrl_cmd_new_server(&sq,
+ le32_to_cpu(pkt->server.service),
+ le32_to_cpu(pkt->server.instance),
+ le32_to_cpu(pkt->server.node),
+ le32_to_cpu(pkt->server.port));
+ break;
+ case QRTR_TYPE_DEL_SERVER:
+ ret = ctrl_cmd_del_server(&sq,
+ le32_to_cpu(pkt->server.service),
+ le32_to_cpu(pkt->server.instance),
+ le32_to_cpu(pkt->server.node),
+ le32_to_cpu(pkt->server.port));
+ break;
+ case QRTR_TYPE_EXIT:
+ case QRTR_TYPE_PING:
+ case QRTR_TYPE_RESUME_TX:
+ break;
+ case QRTR_TYPE_NEW_LOOKUP:
+ ret = ctrl_cmd_new_lookup(&sq,
+ le32_to_cpu(pkt->server.service),
+ le32_to_cpu(pkt->server.instance));
+ break;
+ case QRTR_TYPE_DEL_LOOKUP:
+ ctrl_cmd_del_lookup(&sq,
+ le32_to_cpu(pkt->server.service),
+ le32_to_cpu(pkt->server.instance));
+ break;
+ }
+
+ if (ret < 0)
+ pr_err("failed while handling packet from %d:%d",
+ sq.sq_node, sq.sq_port);
+ }
+
+ kfree(recv_buf);
+}
+
+static void qrtr_ns_data_ready(struct sock *sk)
+{
+ queue_work(qrtr_ns.workqueue, &qrtr_ns.work);
+}
+
+int qrtr_ns_init(void)
+{
+ struct sockaddr_qrtr sq;
+ int ret;
+
+ INIT_LIST_HEAD(&qrtr_ns.lookups);
+ INIT_WORK(&qrtr_ns.work, qrtr_ns_worker);
+
+ ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
+ PF_QIPCRTR, &qrtr_ns.sock);
+ if (ret < 0)
+ return ret;
+
+ ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq);
+ if (ret < 0) {
+ pr_err("failed to get socket name\n");
+ goto err_sock;
+ }
+
+ qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
+ if (!qrtr_ns.workqueue) {
+ ret = -ENOMEM;
+ goto err_sock;
+ }
+
+ qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
+
+ sq.sq_port = QRTR_PORT_CTRL;
+ qrtr_ns.local_node = sq.sq_node;
+
+ ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
+ if (ret < 0) {
+ pr_err("failed to bind to socket\n");
+ goto err_wq;
+ }
+
+ qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
+ qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
+ qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
+
+ ret = say_hello(&qrtr_ns.bcast_sq);
+ if (ret < 0)
+ goto err_wq;
+
+ return 0;
+
+err_wq:
+ destroy_workqueue(qrtr_ns.workqueue);
+err_sock:
+ sock_release(qrtr_ns.sock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(qrtr_ns_init);
+
+void qrtr_ns_remove(void)
+{
+ cancel_work_sync(&qrtr_ns.work);
+ destroy_workqueue(qrtr_ns.workqueue);
+ sock_release(qrtr_ns.sock);
+}
+EXPORT_SYMBOL_GPL(qrtr_ns_remove);
+
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
+MODULE_DESCRIPTION("Qualcomm IPC Router Nameservice");
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/net/qrtr/qrtr.h b/net/qrtr/qrtr.h
new file mode 100644
index 000000000..3f2d28696
--- /dev/null
+++ b/net/qrtr/qrtr.h
@@ -0,0 +1,36 @@
+/* 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);
+
+int qrtr_ns_init(void);
+
+void qrtr_ns_remove(void);
+
+#endif
diff --git a/net/qrtr/smd.c b/net/qrtr/smd.c
new file mode 100644
index 000000000..c91bf030f
--- /dev/null
+++ b/net/qrtr/smd.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ */
+
+#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 000000000..304b41fea
--- /dev/null
+++ b/net/qrtr/tun.c
@@ -0,0 +1,176 @@
+// 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;
+ int ret;
+
+ 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;
+
+ ret = qrtr_endpoint_register(&tun->ep, QRTR_EP_NID_AUTO);
+ if (ret)
+ goto out;
+
+ return 0;
+
+out:
+ filp->private_data = NULL;
+ kfree(tun);
+ return ret;
+}
+
+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;
+
+ if (!len)
+ return -EINVAL;
+
+ if (len > KMALLOC_MAX_SIZE)
+ return -ENOMEM;
+
+ kbuf = kzalloc(len, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (!copy_from_iter_full(kbuf, len, from)) {
+ kfree(kbuf);
+ return -EFAULT;
+ }
+
+ ret = qrtr_endpoint_post(&tun->ep, kbuf, len);
+
+ kfree(kbuf);
+ 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;
+
+ qrtr_endpoint_unregister(&tun->ep);
+
+ /* Discard all SKBs */
+ skb_queue_purge(&tun->queue);
+
+ 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");