diff options
Diffstat (limited to 'net/qrtr')
| -rw-r--r-- | net/qrtr/Kconfig | 38 | ||||
| -rw-r--r-- | net/qrtr/Makefile | 10 | ||||
| -rw-r--r-- | net/qrtr/af_qrtr.c | 1324 | ||||
| -rw-r--r-- | net/qrtr/mhi.c | 137 | ||||
| -rw-r--r-- | net/qrtr/ns.c | 830 | ||||
| -rw-r--r-- | net/qrtr/qrtr.h | 36 | ||||
| -rw-r--r-- | net/qrtr/smd.c | 111 | ||||
| -rw-r--r-- | net/qrtr/tun.c | 176 |
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"); |