Commit bdabad3e authored by Courtney Cavin's avatar Courtney Cavin Committed by David S. Miller

net: Add Qualcomm IPC router

Add an implementation of Qualcomm's IPC router protocol, used to
communicate with service providing remote processors.
Signed-off-by: default avatarCourtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
[bjorn: Cope with 0 being a valid node id and implement RTM_NEWADDR]
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 43315f31
......@@ -201,8 +201,9 @@ struct ucred {
#define AF_NFC 39 /* NFC sockets */
#define AF_VSOCK 40 /* vSockets */
#define AF_KCM 41 /* Kernel Connection Multiplexor*/
#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
#define AF_MAX 42 /* For now.. */
#define AF_MAX 43 /* For now.. */
/* Protocol families, same as address families. */
#define PF_UNSPEC AF_UNSPEC
......@@ -249,6 +250,7 @@ struct ucred {
#define PF_NFC AF_NFC
#define PF_VSOCK AF_VSOCK
#define PF_KCM AF_KCM
#define PF_QIPCRTR AF_QIPCRTR
#define PF_MAX AF_MAX
/* Maximum queue length specifiable by listen. */
......
#ifndef _LINUX_QRTR_H
#define _LINUX_QRTR_H
#include <linux/socket.h>
struct sockaddr_qrtr {
__kernel_sa_family_t sq_family;
__u32 sq_node;
__u32 sq_port;
};
#endif /* _LINUX_QRTR_H */
......@@ -236,6 +236,7 @@ source "net/mpls/Kconfig"
source "net/hsr/Kconfig"
source "net/switchdev/Kconfig"
source "net/l3mdev/Kconfig"
source "net/qrtr/Kconfig"
config RPS
bool
......
......@@ -78,3 +78,4 @@ endif
ifneq ($(CONFIG_NET_L3_MASTER_DEV),)
obj-y += l3mdev/
endif
obj-$(CONFIG_QRTR) += qrtr/
# Qualcomm IPC Router configuration
#
config QRTR
tristate "Qualcomm IPC Router support"
depends on ARCH_QCOM || COMPILE_TEST
---help---
Say Y if you intend to use Qualcomm IPC router protocol. The
protocol is used to communicate with services provided by other
hardware blocks in the system.
In order to do service lookups, a userspace daemon is required to
maintain a service listing.
if QRTR
config QRTR_SMD
tristate "SMD IPC Router channels"
depends on QCOM_SMD || COMPILE_TEST
---help---
Say Y here to support SMD based ipcrouter channels. SMD is the
most common transport for IPC Router.
endif # QRTR
obj-$(CONFIG_QRTR) := qrtr.o
obj-$(CONFIG_QRTR_SMD) += smd.o
/*
* Copyright (c) 2015, Sony Mobile Communications Inc.
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/qrtr.h>
#include <linux/termios.h> /* For TIOCINQ/OUTQ */
#include <net/sock.h>
#include "qrtr.h"
#define QRTR_PROTO_VER 1
/* auto-bind range */
#define QRTR_MIN_EPH_SOCKET 0x4000
#define QRTR_MAX_EPH_SOCKET 0x7fff
enum qrtr_pkt_type {
QRTR_TYPE_DATA = 1,
QRTR_TYPE_HELLO = 2,
QRTR_TYPE_BYE = 3,
QRTR_TYPE_NEW_SERVER = 4,
QRTR_TYPE_DEL_SERVER = 5,
QRTR_TYPE_DEL_CLIENT = 6,
QRTR_TYPE_RESUME_TX = 7,
QRTR_TYPE_EXIT = 8,
QRTR_TYPE_PING = 9,
};
/**
* struct qrtr_hdr - (I|R)PCrouter packet header
* @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 {
__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;
#define QRTR_HDR_SIZE sizeof(struct qrtr_hdr)
#define QRTR_NODE_BCAST ((unsigned int)-1)
#define QRTR_PORT_CTRL ((unsigned int)-2)
struct qrtr_sock {
/* WARNING: sk must be the first member */
struct sock sk;
struct sockaddr_qrtr us;
struct sockaddr_qrtr peer;
};
static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
{
BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
return container_of(sk, struct qrtr_sock, sk);
}
static unsigned int qrtr_local_nid = -1;
/* for node ids */
static RADIX_TREE(qrtr_nodes, GFP_KERNEL);
/* broadcast list */
static LIST_HEAD(qrtr_all_nodes);
/* lock for qrtr_nodes, qrtr_all_nodes and node reference */
static DEFINE_MUTEX(qrtr_node_lock);
/* local port allocation management */
static DEFINE_IDR(qrtr_ports);
static DEFINE_MUTEX(qrtr_port_lock);
/**
* struct qrtr_node - endpoint node
* @ep_lock: lock for endpoint management and callbacks
* @ep: endpoint
* @ref: reference count for node
* @nid: node id
* @rx_queue: receive queue
* @work: scheduled work struct for recv work
* @item: list item for broadcast list
*/
struct qrtr_node {
struct mutex ep_lock;
struct qrtr_endpoint *ep;
struct kref ref;
unsigned int nid;
struct sk_buff_head rx_queue;
struct work_struct work;
struct list_head item;
};
/* Release node resources and free the node.
*
* Do not call directly, use qrtr_node_release. To be used with
* kref_put_mutex. As such, the node mutex is expected to be locked on call.
*/
static void __qrtr_node_release(struct kref *kref)
{
struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
if (node->nid != QRTR_EP_NID_AUTO)
radix_tree_delete(&qrtr_nodes, node->nid);
list_del(&node->item);
mutex_unlock(&qrtr_node_lock);
skb_queue_purge(&node->rx_queue);
kfree(node);
}
/* Increment reference to node. */
static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
{
if (node)
kref_get(&node->ref);
return node;
}
/* Decrement reference to node and release as necessary. */
static void qrtr_node_release(struct qrtr_node *node)
{
if (!node)
return;
kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
}
/* Pass an outgoing packet socket buffer to the endpoint driver. */
static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb)
{
int rc = -ENODEV;
mutex_lock(&node->ep_lock);
if (node->ep)
rc = node->ep->xmit(node->ep, skb);
else
kfree_skb(skb);
mutex_unlock(&node->ep_lock);
return rc;
}
/* Lookup node by id.
*
* callers must release with qrtr_node_release()
*/
static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
{
struct qrtr_node *node;
mutex_lock(&qrtr_node_lock);
node = radix_tree_lookup(&qrtr_nodes, nid);
node = qrtr_node_acquire(node);
mutex_unlock(&qrtr_node_lock);
return node;
}
/* Assign node id to node.
*
* This is mostly useful for automatic node id assignment, based on
* the source id in the incoming packet.
*/
static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
{
if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO)
return;
mutex_lock(&qrtr_node_lock);
radix_tree_insert(&qrtr_nodes, nid, node);
node->nid = nid;
mutex_unlock(&qrtr_node_lock);
}
/**
* qrtr_endpoint_post() - post incoming data
* @ep: endpoint handle
* @data: data pointer
* @len: size of data in bytes
*
* Return: 0 on success; negative error code on failure
*/
int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
{
struct qrtr_node *node = ep->node;
const struct qrtr_hdr *phdr = data;
struct sk_buff *skb;
unsigned int psize;
unsigned int size;
unsigned int type;
unsigned int ver;
unsigned int dst;
if (len < QRTR_HDR_SIZE || len & 3)
return -EINVAL;
ver = le32_to_cpu(phdr->version);
size = le32_to_cpu(phdr->size);
type = le32_to_cpu(phdr->type);
dst = le32_to_cpu(phdr->dst_port_id);
psize = (size + 3) & ~3;
if (ver != QRTR_PROTO_VER)
return -EINVAL;
if (len != psize + QRTR_HDR_SIZE)
return -EINVAL;
if (dst != QRTR_PORT_CTRL && type != QRTR_TYPE_DATA)
return -EINVAL;
skb = netdev_alloc_skb(NULL, len);
if (!skb)
return -ENOMEM;
skb_reset_transport_header(skb);
memcpy(skb_put(skb, len), data, len);
skb_queue_tail(&node->rx_queue, skb);
schedule_work(&node->work);
return 0;
}
EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
/* Allocate and construct a resume-tx packet. */
static struct sk_buff *qrtr_alloc_resume_tx(u32 src_node,
u32 dst_node, u32 port)
{
const int pkt_len = 20;
struct qrtr_hdr *hdr;
struct sk_buff *skb;
u32 *buf;
skb = alloc_skb(QRTR_HDR_SIZE + pkt_len, GFP_KERNEL);
if (!skb)
return NULL;
skb_reset_transport_header(skb);
hdr = (struct qrtr_hdr *)skb_put(skb, QRTR_HDR_SIZE);
hdr->version = cpu_to_le32(QRTR_PROTO_VER);
hdr->type = cpu_to_le32(QRTR_TYPE_RESUME_TX);
hdr->src_node_id = cpu_to_le32(src_node);
hdr->src_port_id = cpu_to_le32(QRTR_PORT_CTRL);
hdr->confirm_rx = cpu_to_le32(0);
hdr->size = cpu_to_le32(pkt_len);
hdr->dst_node_id = cpu_to_le32(dst_node);
hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
buf = (u32 *)skb_put(skb, pkt_len);
memset(buf, 0, pkt_len);
buf[0] = cpu_to_le32(QRTR_TYPE_RESUME_TX);
buf[1] = cpu_to_le32(src_node);
buf[2] = cpu_to_le32(port);
return skb;
}
static struct qrtr_sock *qrtr_port_lookup(int port);
static void qrtr_port_put(struct qrtr_sock *ipc);
/* Handle and route a received packet.
*
* This will auto-reply with resume-tx packet as necessary.
*/
static void qrtr_node_rx_work(struct work_struct *work)
{
struct qrtr_node *node = container_of(work, struct qrtr_node, work);
struct sk_buff *skb;
while ((skb = skb_dequeue(&node->rx_queue)) != NULL) {
const struct qrtr_hdr *phdr;
u32 dst_node, dst_port;
struct qrtr_sock *ipc;
u32 src_node;
int confirm;
phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
src_node = le32_to_cpu(phdr->src_node_id);
dst_node = le32_to_cpu(phdr->dst_node_id);
dst_port = le32_to_cpu(phdr->dst_port_id);
confirm = !!phdr->confirm_rx;
qrtr_node_assign(node, src_node);
ipc = qrtr_port_lookup(dst_port);
if (!ipc) {
kfree_skb(skb);
} else {
if (sock_queue_rcv_skb(&ipc->sk, skb))
kfree_skb(skb);
qrtr_port_put(ipc);
}
if (confirm) {
skb = qrtr_alloc_resume_tx(dst_node, node->nid, dst_port);
if (!skb)
break;
if (qrtr_node_enqueue(node, skb))
break;
}
}
}
/**
* qrtr_endpoint_register() - register a new endpoint
* @ep: endpoint to register
* @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
* Return: 0 on success; negative error code on failure
*
* The specified endpoint must have the xmit function pointer set on call.
*/
int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
{
struct qrtr_node *node;
if (!ep || !ep->xmit)
return -EINVAL;
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
INIT_WORK(&node->work, qrtr_node_rx_work);
kref_init(&node->ref);
mutex_init(&node->ep_lock);
skb_queue_head_init(&node->rx_queue);
node->nid = QRTR_EP_NID_AUTO;
node->ep = ep;
qrtr_node_assign(node, nid);
mutex_lock(&qrtr_node_lock);
list_add(&node->item, &qrtr_all_nodes);
mutex_unlock(&qrtr_node_lock);
ep->node = node;
return 0;
}
EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
/**
* qrtr_endpoint_unregister - unregister endpoint
* @ep: endpoint to unregister
*/
void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
{
struct qrtr_node *node = ep->node;
mutex_lock(&node->ep_lock);
node->ep = NULL;
mutex_unlock(&node->ep_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;
mutex_lock(&qrtr_port_lock);
ipc = idr_find(&qrtr_ports, port);
if (ipc)
sock_hold(&ipc->sk);
mutex_unlock(&qrtr_port_lock);
return ipc;
}
/* Release acquired socket. */
static void qrtr_port_put(struct qrtr_sock *ipc)
{
sock_put(&ipc->sk);
}
/* Remove port assignment. */
static void qrtr_port_remove(struct qrtr_sock *ipc)
{
int port = ipc->us.sq_port;
if (port == QRTR_PORT_CTRL)
port = 0;
__sock_put(&ipc->sk);
mutex_lock(&qrtr_port_lock);
idr_remove(&qrtr_ports, port);
mutex_unlock(&qrtr_port_lock);
}
/* Assign port number to socket.
*
* Specify port in the integer pointed to by port, and it will be adjusted
* on return as necesssary.
*
* Port may be:
* 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
* <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
* >QRTR_MIN_EPH_SOCKET: Specified; available to all
*/
static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
{
int rc;
mutex_lock(&qrtr_port_lock);
if (!*port) {
rc = idr_alloc(&qrtr_ports, ipc,
QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1,
GFP_ATOMIC);
if (rc >= 0)
*port = rc;
} else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
rc = -EACCES;
} else if (*port == QRTR_PORT_CTRL) {
rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC);
} else {
rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC);
if (rc >= 0)
*port = rc;
}
mutex_unlock(&qrtr_port_lock);
if (rc == -ENOSPC)
return -EADDRINUSE;
else if (rc < 0)
return rc;
sock_hold(&ipc->sk);
return 0;
}
/* 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);
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)
{
const struct qrtr_hdr *phdr;
struct qrtr_sock *ipc;
phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
ipc = qrtr_port_lookup(le32_to_cpu(phdr->dst_port_id));
if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
kfree_skb(skb);
return -ENODEV;
}
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)
{
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);
}
mutex_unlock(&qrtr_node_lock);
qrtr_local_enqueue(node, skb);
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 *);
struct qrtr_sock *ipc = qrtr_sk(sock->sk);
struct sock *sk = sock->sk;
struct qrtr_node *node;
struct qrtr_hdr *hdr;
struct sk_buff *skb;
size_t plen;
int rc;
if (msg->msg_flags & ~(MSG_DONTWAIT))
return -EINVAL;
if (len > 65535)
return -EMSGSIZE;
lock_sock(sk);
if (addr) {
if (msg->msg_namelen < sizeof(*addr)) {
release_sock(sk);
return -EINVAL;
}
if (addr->sq_family != AF_QIPCRTR) {
release_sock(sk);
return -EINVAL;
}
rc = qrtr_autobind(sock);
if (rc) {
release_sock(sk);
return rc;
}
} else if (sk->sk_state == TCP_ESTABLISHED) {
addr = &ipc->peer;
} else {
release_sock(sk);
return -ENOTCONN;
}
node = NULL;
if (addr->sq_node == QRTR_NODE_BCAST) {
enqueue_fn = qrtr_bcast_enqueue;
} else if (addr->sq_node == ipc->us.sq_node) {
enqueue_fn = qrtr_local_enqueue;
} else {
enqueue_fn = qrtr_node_enqueue;
node = qrtr_node_lookup(addr->sq_node);
if (!node) {
release_sock(sk);
return -ECONNRESET;
}
}
plen = (len + 3) & ~3;
skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_SIZE,
msg->msg_flags & MSG_DONTWAIT, &rc);
if (!skb)
goto out_node;
skb_reset_transport_header(skb);
skb_put(skb, len + QRTR_HDR_SIZE);
hdr = (struct qrtr_hdr *)skb_transport_header(skb);
hdr->version = cpu_to_le32(QRTR_PROTO_VER);
hdr->src_node_id = cpu_to_le32(ipc->us.sq_node);
hdr->src_port_id = cpu_to_le32(ipc->us.sq_port);
hdr->confirm_rx = cpu_to_le32(0);
hdr->size = cpu_to_le32(len);
hdr->dst_node_id = cpu_to_le32(addr->sq_node);
hdr->dst_port_id = cpu_to_le32(addr->sq_port);
rc = skb_copy_datagram_from_iter(skb, QRTR_HDR_SIZE,
&msg->msg_iter, len);
if (rc) {
kfree_skb(skb);
goto out_node;
}
if (plen != len) {
skb_pad(skb, plen - len);
skb_put(skb, plen - len);
}
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, QRTR_HDR_SIZE, &hdr->type, 4);
} else {
hdr->type = cpu_to_le32(QRTR_TYPE_DATA);
}
rc = enqueue_fn(node, skb);
if (rc >= 0)
rc = len;
out_node:
qrtr_node_release(node);
release_sock(sk);
return rc;
}
static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
size_t size, int flags)
{
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
const struct qrtr_hdr *phdr;
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied, rc;
lock_sock(sk);
if (sock_flag(sk, SOCK_ZAPPED)) {
release_sock(sk);
return -EADDRNOTAVAIL;
}
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &rc);
if (!skb) {
release_sock(sk);
return rc;
}
phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
copied = le32_to_cpu(phdr->size);
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
rc = skb_copy_datagram_msg(skb, QRTR_HDR_SIZE, msg, copied);
if (rc < 0)
goto out;
rc = copied;
if (addr) {
addr->sq_family = AF_QIPCRTR;
addr->sq_node = le32_to_cpu(phdr->src_node_id);
addr->sq_port = le32_to_cpu(phdr->src_port_id);
msg->msg_namelen = sizeof(*addr);
}
out:
skb_free_datagram(sk, skb);
release_sock(sk);
return rc;
}
static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
int len, int flags)
{
DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
struct qrtr_sock *ipc = qrtr_sk(sock->sk);
struct sock *sk = sock->sk;
int rc;
if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
return -EINVAL;
lock_sock(sk);
sk->sk_state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
rc = qrtr_autobind(sock);
if (rc) {
release_sock(sk);
return rc;
}
ipc->peer = *addr;
sock->state = SS_CONNECTED;
sk->sk_state = TCP_ESTABLISHED;
release_sock(sk);
return 0;
}
static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
int *len, 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);
*len = sizeof(qaddr);
qaddr.sq_family = AF_QIPCRTR;
memcpy(saddr, &qaddr, sizeof(qaddr));
return 0;
}
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 - QRTR_HDR_SIZE;
rc = put_user(len, (int __user *)argp);
break;
case SIOCGIFADDR:
if (copy_from_user(&ifr, argp, sizeof(ifr))) {
rc = -EFAULT;
break;
}
sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
*sq = ipc->us;
if (copy_to_user(argp, &ifr, sizeof(ifr))) {
rc = -EFAULT;
break;
}
break;
case SIOCGSTAMP:
rc = sock_get_timestamp(sk, argp);
break;
case SIOCADDRT:
case SIOCDELRT:
case SIOCSIFADDR:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
rc = -EINVAL;
break;
default:
rc = -ENOIOCTLCMD;
break;
}
release_sock(sk);
return rc;
}
static int qrtr_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct qrtr_sock *ipc;
if (!sk)
return 0;
lock_sock(sk);
ipc = qrtr_sk(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
sock->sk = NULL;
if (!sock_flag(sk, SOCK_ZAPPED))
qrtr_port_remove(ipc);
skb_queue_purge(&sk->sk_receive_queue);
release_sock(sk);
sock_put(sk);
return 0;
}
static const struct proto_ops qrtr_proto_ops = {
.owner = THIS_MODULE,
.family = AF_QIPCRTR,
.bind = qrtr_bind,
.connect = qrtr_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.listen = sock_no_listen,
.sendmsg = qrtr_sendmsg,
.recvmsg = qrtr_recvmsg,
.getname = qrtr_getname,
.ioctl = qrtr_ioctl,
.poll = datagram_poll,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.release = qrtr_release,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
static struct proto qrtr_proto = {
.name = "QIPCRTR",
.owner = THIS_MODULE,
.obj_size = sizeof(struct qrtr_sock),
};
static int qrtr_create(struct net *net, struct socket *sock,
int protocol, int kern)
{
struct qrtr_sock *ipc;
struct sock *sk;
if (sock->type != SOCK_DGRAM)
return -EPROTOTYPE;
sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
if (!sk)
return -ENOMEM;
sock_set_flag(sk, SOCK_ZAPPED);
sock_init_data(sock, sk);
sock->ops = &qrtr_proto_ops;
ipc = qrtr_sk(sk);
ipc->us.sq_family = AF_QIPCRTR;
ipc->us.sq_node = qrtr_local_nid;
ipc->us.sq_port = 0;
return 0;
}
static const struct nla_policy qrtr_policy[IFA_MAX + 1] = {
[IFA_LOCAL] = { .type = NLA_U32 },
};
static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct nlattr *tb[IFA_MAX + 1];
struct ifaddrmsg *ifm;
int rc;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!netlink_capable(skb, CAP_SYS_ADMIN))
return -EPERM;
ASSERT_RTNL();
rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy);
if (rc < 0)
return rc;
ifm = nlmsg_data(nlh);
if (!tb[IFA_LOCAL])
return -EINVAL;
qrtr_local_nid = nla_get_u32(tb[IFA_LOCAL]);
return 0;
}
static const struct net_proto_family qrtr_family = {
.owner = THIS_MODULE,
.family = AF_QIPCRTR,
.create = qrtr_create,
};
static int __init qrtr_proto_init(void)
{
int rc;
rc = proto_register(&qrtr_proto, 1);
if (rc)
return rc;
rc = sock_register(&qrtr_family);
if (rc) {
proto_unregister(&qrtr_proto);
return rc;
}
rtnl_register(PF_QIPCRTR, RTM_NEWADDR, qrtr_addr_doit, NULL, NULL);
return 0;
}
module_init(qrtr_proto_init);
static void __exit qrtr_proto_fini(void)
{
rtnl_unregister(PF_QIPCRTR, RTM_NEWADDR);
sock_unregister(qrtr_family.family);
proto_unregister(&qrtr_proto);
}
module_exit(qrtr_proto_fini);
MODULE_DESCRIPTION("Qualcomm IPC-router driver");
MODULE_LICENSE("GPL v2");
#ifndef __QRTR_H_
#define __QRTR_H_
#include <linux/types.h>
struct sk_buff;
/* endpoint node id auto assignment */
#define QRTR_EP_NID_AUTO (-1)
/**
* struct qrtr_endpoint - endpoint handle
* @xmit: Callback for outgoing packets
*
* The socket buffer passed to the xmit function becomes owned by the endpoint
* driver. As such, when the driver is done with the buffer, it should
* call kfree_skb() on failure, or consume_skb() on success.
*/
struct qrtr_endpoint {
int (*xmit)(struct qrtr_endpoint *ep, struct sk_buff *skb);
/* private: not for endpoint use */
struct qrtr_node *node;
};
int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid);
void qrtr_endpoint_unregister(struct qrtr_endpoint *ep);
int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len);
#endif
/*
* Copyright (c) 2015, Sony Mobile Communications Inc.
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/soc/qcom/smd.h>
#include "qrtr.h"
struct qrtr_smd_dev {
struct qrtr_endpoint ep;
struct qcom_smd_channel *channel;
};
/* from smd to qrtr */
static int qcom_smd_qrtr_callback(struct qcom_smd_device *sdev,
const void *data, size_t len)
{
struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
int rc;
if (!qdev)
return -EAGAIN;
rc = qrtr_endpoint_post(&qdev->ep, data, len);
if (rc == -EINVAL) {
dev_err(&sdev->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 = qcom_smd_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 qcom_smd_device *sdev)
{
struct qrtr_smd_dev *qdev;
int rc;
qdev = devm_kzalloc(&sdev->dev, sizeof(*qdev), GFP_KERNEL);
if (!qdev)
return -ENOMEM;
qdev->channel = sdev->channel;
qdev->ep.xmit = qcom_smd_qrtr_send;
rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
if (rc)
return rc;
dev_set_drvdata(&sdev->dev, qdev);
dev_dbg(&sdev->dev, "Qualcomm SMD QRTR driver probed\n");
return 0;
}
static void qcom_smd_qrtr_remove(struct qcom_smd_device *sdev)
{
struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
qrtr_endpoint_unregister(&qdev->ep);
dev_set_drvdata(&sdev->dev, NULL);
}
static const struct qcom_smd_id qcom_smd_qrtr_smd_match[] = {
{ "IPCRTR" },
{}
};
static struct qcom_smd_driver qcom_smd_qrtr_driver = {
.probe = qcom_smd_qrtr_probe,
.remove = qcom_smd_qrtr_remove,
.callback = qcom_smd_qrtr_callback,
.smd_match_table = qcom_smd_qrtr_smd_match,
.driver = {
.name = "qcom_smd_qrtr",
.owner = THIS_MODULE,
},
};
module_qcom_smd_driver(qcom_smd_qrtr_driver);
MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
MODULE_LICENSE("GPL v2");
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment