Release 4.11 net/qrtr/qrtr.c
/*
* 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);
}
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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);
}
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/* Increment reference to node. */
static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
{
if (node)
kref_get(&node->ref);
return node;
}
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/* 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);
}
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/* 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;
}
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/* 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;
}
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/* 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);
}
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/**
* 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;
}
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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;
__le32 *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 = (__le32 *)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;
}
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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;
}
}
}
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/**
* 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;
}
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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;
}
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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;
}
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/* Release acquired socket. */
static void qrtr_port_put(struct qrtr_sock *ipc)
{
sock_put(&ipc->sk);
}
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/* 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);
}
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/* 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;
}
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/* 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;
}
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/* 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);
}
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/* 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;
}
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/* 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;
}
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/* 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;
}
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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) {
rc = skb_pad(skb, plen - len);
if (rc)
goto out_node;
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;
}
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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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Courtney Cavin | 246 | 100.00% | 1 | 100.00% |
Total | 246 | 100.00% | 1 | 100.00% |
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(