Contributors: 33
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Evgeniy Polyakov |
693 |
57.13% |
6 |
11.76% |
| Anjali Kulkarni |
155 |
12.78% |
2 |
3.92% |
| David Fries |
89 |
7.34% |
3 |
5.88% |
| Li Zefan |
85 |
7.01% |
4 |
7.84% |
| Patrick McHardy |
34 |
2.80% |
2 |
3.92% |
| Philipp Reisner |
29 |
2.39% |
3 |
5.88% |
| Javier Martinez Canillas |
20 |
1.65% |
1 |
1.96% |
| Pablo Neira Ayuso |
19 |
1.57% |
1 |
1.96% |
| Mathias Krause |
18 |
1.48% |
2 |
3.92% |
| Gao Feng |
9 |
0.74% |
2 |
3.92% |
| Stephen Hemminger |
7 |
0.58% |
1 |
1.96% |
| Arnaldo Carvalho de Melo |
6 |
0.49% |
1 |
1.96% |
| Linus Torvalds (pre-git) |
5 |
0.41% |
3 |
5.88% |
| Tejun Heo |
4 |
0.33% |
1 |
1.96% |
| Florian Westphal |
4 |
0.33% |
1 |
1.96% |
| Hong Zhi Guo |
4 |
0.33% |
1 |
1.96% |
| Randy Dunlap |
4 |
0.33% |
1 |
1.96% |
| Eric W. Biedermann |
3 |
0.25% |
1 |
1.96% |
| Mel Gorman |
3 |
0.25% |
1 |
1.96% |
| Arjan van de Ven |
3 |
0.25% |
1 |
1.96% |
| Thomas Gleixner |
2 |
0.16% |
1 |
1.96% |
| Mike Frysinger |
2 |
0.16% |
1 |
1.96% |
| Geoff Levand |
2 |
0.16% |
1 |
1.96% |
| Al Viro |
2 |
0.16% |
1 |
1.96% |
| Christoph Hellwig |
2 |
0.16% |
1 |
1.96% |
| Denis V. Lunev |
2 |
0.16% |
1 |
1.96% |
| Linus Torvalds |
1 |
0.08% |
1 |
1.96% |
| Elena Reshetova |
1 |
0.08% |
1 |
1.96% |
| Joe Perches |
1 |
0.08% |
1 |
1.96% |
| Vasily Averin |
1 |
0.08% |
1 |
1.96% |
| Qinglang Miao |
1 |
0.08% |
1 |
1.96% |
| Michal Januszewski |
1 |
0.08% |
1 |
1.96% |
| David Howells |
1 |
0.08% |
1 |
1.96% |
| Total |
1213 |
|
51 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* connector.c
*
* 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
* All rights reserved.
*/
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <linux/moduleparam.h>
#include <linux/connector.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <net/sock.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
MODULE_DESCRIPTION("Generic userspace <-> kernelspace connector.");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_CONNECTOR);
static struct cn_dev cdev;
static int cn_already_initialized;
/*
* Sends mult (multiple) cn_msg at a time.
*
* msg->seq and msg->ack are used to determine message genealogy.
* When someone sends message it puts there locally unique sequence
* and random acknowledge numbers. Sequence number may be copied into
* nlmsghdr->nlmsg_seq too.
*
* Sequence number is incremented with each message to be sent.
*
* If we expect a reply to our message then the sequence number in
* received message MUST be the same as in original message, and
* acknowledge number MUST be the same + 1.
*
* If we receive a message and its sequence number is not equal to the
* one we are expecting then it is a new message.
*
* If we receive a message and its sequence number is the same as one
* we are expecting but it's acknowledgement number is not equal to
* the acknowledgement number in the original message + 1, then it is
* a new message.
*
* If msg->len != len, then additional cn_msg messages are expected following
* the first msg.
*
* The message is sent to, the portid if given, the group if given, both if
* both, or if both are zero then the group is looked up and sent there.
*/
int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 __group,
gfp_t gfp_mask,
int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
void *filter_data)
{
struct cn_callback_entry *__cbq;
unsigned int size;
struct sk_buff *skb;
struct nlmsghdr *nlh;
struct cn_msg *data;
struct cn_dev *dev = &cdev;
u32 group = 0;
int found = 0;
if (portid || __group) {
group = __group;
} else {
spin_lock_bh(&dev->cbdev->queue_lock);
list_for_each_entry(__cbq, &dev->cbdev->queue_list,
callback_entry) {
if (cn_cb_equal(&__cbq->id.id, &msg->id)) {
found = 1;
group = __cbq->group;
break;
}
}
spin_unlock_bh(&dev->cbdev->queue_lock);
if (!found)
return -ENODEV;
}
if (!portid && !netlink_has_listeners(dev->nls, group))
return -ESRCH;
size = sizeof(*msg) + len;
skb = nlmsg_new(size, gfp_mask);
if (!skb)
return -ENOMEM;
nlh = nlmsg_put(skb, 0, msg->seq, NLMSG_DONE, size, 0);
if (!nlh) {
kfree_skb(skb);
return -EMSGSIZE;
}
data = nlmsg_data(nlh);
memcpy(data, msg, size);
NETLINK_CB(skb).dst_group = group;
if (group)
return netlink_broadcast_filtered(dev->nls, skb, portid, group,
gfp_mask, filter,
(void *)filter_data);
return netlink_unicast(dev->nls, skb, portid,
!gfpflags_allow_blocking(gfp_mask));
}
EXPORT_SYMBOL_GPL(cn_netlink_send_mult);
/* same as cn_netlink_send_mult except msg->len is used for len */
int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 __group,
gfp_t gfp_mask)
{
return cn_netlink_send_mult(msg, msg->len, portid, __group, gfp_mask,
NULL, NULL);
}
EXPORT_SYMBOL_GPL(cn_netlink_send);
/*
* Callback helper - queues work and setup destructor for given data.
*/
static int cn_call_callback(struct sk_buff *skb)
{
struct nlmsghdr *nlh;
struct cn_callback_entry *i, *cbq = NULL;
struct cn_dev *dev = &cdev;
struct cn_msg *msg = nlmsg_data(nlmsg_hdr(skb));
struct netlink_skb_parms *nsp = &NETLINK_CB(skb);
int err = -ENODEV;
/* verify msg->len is within skb */
nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < NLMSG_HDRLEN + sizeof(struct cn_msg) + msg->len)
return -EINVAL;
spin_lock_bh(&dev->cbdev->queue_lock);
list_for_each_entry(i, &dev->cbdev->queue_list, callback_entry) {
if (cn_cb_equal(&i->id.id, &msg->id)) {
refcount_inc(&i->refcnt);
cbq = i;
break;
}
}
spin_unlock_bh(&dev->cbdev->queue_lock);
if (cbq != NULL) {
cbq->callback(msg, nsp);
kfree_skb(skb);
cn_queue_release_callback(cbq);
err = 0;
}
return err;
}
/*
* Allow non-root access for NETLINK_CONNECTOR family having CN_IDX_PROC
* multicast group.
*/
static int cn_bind(struct net *net, int group)
{
unsigned long groups = (unsigned long) group;
if (ns_capable(net->user_ns, CAP_NET_ADMIN))
return 0;
if (test_bit(CN_IDX_PROC - 1, &groups))
return 0;
return -EPERM;
}
static void cn_release(struct sock *sk, unsigned long *groups)
{
if (groups && test_bit(CN_IDX_PROC - 1, groups)) {
kfree(sk->sk_user_data);
sk->sk_user_data = NULL;
}
}
/*
* Main netlink receiving function.
*
* It checks skb, netlink header and msg sizes, and calls callback helper.
*/
static void cn_rx_skb(struct sk_buff *skb)
{
struct nlmsghdr *nlh;
int len, err;
if (skb->len >= NLMSG_HDRLEN) {
nlh = nlmsg_hdr(skb);
len = nlmsg_len(nlh);
if (len < (int)sizeof(struct cn_msg) ||
skb->len < nlh->nlmsg_len ||
len > CONNECTOR_MAX_MSG_SIZE)
return;
err = cn_call_callback(skb_get(skb));
if (err < 0)
kfree_skb(skb);
}
}
/*
* Callback add routing - adds callback with given ID and name.
* If there is registered callback with the same ID it will not be added.
*
* May sleep.
*/
int cn_add_callback(const struct cb_id *id, const char *name,
void (*callback)(struct cn_msg *,
struct netlink_skb_parms *))
{
struct cn_dev *dev = &cdev;
if (!cn_already_initialized)
return -EAGAIN;
return cn_queue_add_callback(dev->cbdev, name, id, callback);
}
EXPORT_SYMBOL_GPL(cn_add_callback);
/*
* Callback remove routing - removes callback
* with given ID.
* If there is no registered callback with given
* ID nothing happens.
*
* May sleep while waiting for reference counter to become zero.
*/
void cn_del_callback(const struct cb_id *id)
{
struct cn_dev *dev = &cdev;
cn_queue_del_callback(dev->cbdev, id);
}
EXPORT_SYMBOL_GPL(cn_del_callback);
static int __maybe_unused cn_proc_show(struct seq_file *m, void *v)
{
struct cn_queue_dev *dev = cdev.cbdev;
struct cn_callback_entry *cbq;
seq_printf(m, "Name ID\n");
spin_lock_bh(&dev->queue_lock);
list_for_each_entry(cbq, &dev->queue_list, callback_entry) {
seq_printf(m, "%-15s %u:%u\n",
cbq->id.name,
cbq->id.id.idx,
cbq->id.id.val);
}
spin_unlock_bh(&dev->queue_lock);
return 0;
}
static int cn_init(void)
{
struct cn_dev *dev = &cdev;
struct netlink_kernel_cfg cfg = {
.groups = CN_NETLINK_USERS + 0xf,
.input = cn_rx_skb,
.flags = NL_CFG_F_NONROOT_RECV,
.bind = cn_bind,
.release = cn_release,
};
dev->nls = netlink_kernel_create(&init_net, NETLINK_CONNECTOR, &cfg);
if (!dev->nls)
return -EIO;
dev->cbdev = cn_queue_alloc_dev("cqueue", dev->nls);
if (!dev->cbdev) {
netlink_kernel_release(dev->nls);
return -EINVAL;
}
cn_already_initialized = 1;
proc_create_single("connector", S_IRUGO, init_net.proc_net, cn_proc_show);
return 0;
}
static void cn_fini(void)
{
struct cn_dev *dev = &cdev;
cn_already_initialized = 0;
remove_proc_entry("connector", init_net.proc_net);
cn_queue_free_dev(dev->cbdev);
netlink_kernel_release(dev->nls);
}
subsys_initcall(cn_init);
module_exit(cn_fini);