sock_diag.c 7.9 KB
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#include <linux/mutex.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/net_namespace.h>
#include <linux/module.h>
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#include <net/sock.h>
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#include <linux/kernel.h>
#include <linux/tcp.h>
#include <linux/workqueue.h>
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#include <linux/inet_diag.h>
#include <linux/sock_diag.h>

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static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
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static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
static DEFINE_MUTEX(sock_diag_table_mutex);
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static struct workqueue_struct *broadcast_wq;
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static u64 sock_gen_cookie(struct sock *sk)
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{
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	while (1) {
		u64 res = atomic64_read(&sk->sk_cookie);

		if (res)
			return res;
		res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
		atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	}
}

int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
{
	u64 res;

	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
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		return 0;
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	res = sock_gen_cookie(sk);
	if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
		return -ESTALE;

	return 0;
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}
EXPORT_SYMBOL_GPL(sock_diag_check_cookie);

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void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
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{
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	u64 res = sock_gen_cookie(sk);

	cookie[0] = (u32)res;
	cookie[1] = (u32)(res >> 32);
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}
EXPORT_SYMBOL_GPL(sock_diag_save_cookie);

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int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
{
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	u32 mem[SK_MEMINFO_VARS];
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	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
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	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
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	return nla_put(skb, attrtype, sizeof(mem), &mem);
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}
EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);

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int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
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			     struct sk_buff *skb, int attrtype)
{
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	struct sock_fprog_kern *fprog;
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	struct sk_filter *filter;
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	struct nlattr *attr;
	unsigned int flen;
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	int err = 0;

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	if (!may_report_filterinfo) {
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		nla_reserve(skb, attrtype, 0);
		return 0;
	}

	rcu_read_lock();
	filter = rcu_dereference(sk->sk_filter);
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	if (!filter)
		goto out;
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	fprog = filter->prog->orig_prog;
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	flen = bpf_classic_proglen(fprog);
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	attr = nla_reserve(skb, attrtype, flen);
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	if (attr == NULL) {
		err = -EMSGSIZE;
		goto out;
	}

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	memcpy(nla_data(attr), fprog->filter, flen);
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out:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(sock_diag_put_filterinfo);

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struct broadcast_sk {
	struct sock *sk;
	struct work_struct work;
};

static size_t sock_diag_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	       + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
	       + nla_total_size(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
}

static void sock_diag_broadcast_destroy_work(struct work_struct *work)
{
	struct broadcast_sk *bsk =
		container_of(work, struct broadcast_sk, work);
	struct sock *sk = bsk->sk;
	const struct sock_diag_handler *hndl;
	struct sk_buff *skb;
	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	int err = -1;

	WARN_ON(group == SKNLGRP_NONE);

	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	if (!skb)
		goto out;

	mutex_lock(&sock_diag_table_mutex);
	hndl = sock_diag_handlers[sk->sk_family];
	if (hndl && hndl->get_info)
		err = hndl->get_info(skb, sk);
	mutex_unlock(&sock_diag_table_mutex);

	if (!err)
		nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
				GFP_KERNEL);
	else
		kfree_skb(skb);
out:
	sk_destruct(sk);
	kfree(bsk);
}

void sock_diag_broadcast_destroy(struct sock *sk)
{
	/* Note, this function is often called from an interrupt context. */
	struct broadcast_sk *bsk =
		kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	if (!bsk)
		return sk_destruct(sk);
	bsk->sk = sk;
	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	queue_work(broadcast_wq, &bsk->work);
}

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void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
{
	mutex_lock(&sock_diag_table_mutex);
	inet_rcv_compat = fn;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);

void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
{
	mutex_lock(&sock_diag_table_mutex);
	inet_rcv_compat = NULL;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);

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int sock_diag_register(const struct sock_diag_handler *hndl)
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{
	int err = 0;

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	if (hndl->family >= AF_MAX)
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		return -EINVAL;

	mutex_lock(&sock_diag_table_mutex);
	if (sock_diag_handlers[hndl->family])
		err = -EBUSY;
	else
		sock_diag_handlers[hndl->family] = hndl;
	mutex_unlock(&sock_diag_table_mutex);

	return err;
}
EXPORT_SYMBOL_GPL(sock_diag_register);

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void sock_diag_unregister(const struct sock_diag_handler *hnld)
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{
	int family = hnld->family;

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	if (family >= AF_MAX)
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		return;

	mutex_lock(&sock_diag_table_mutex);
	BUG_ON(sock_diag_handlers[family] != hnld);
	sock_diag_handlers[family] = NULL;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_unregister);

static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	int err;
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	struct sock_diag_req *req = nlmsg_data(nlh);
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	const struct sock_diag_handler *hndl;
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	if (nlmsg_len(nlh) < sizeof(*req))
		return -EINVAL;

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	if (req->sdiag_family >= AF_MAX)
		return -EINVAL;

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	if (sock_diag_handlers[req->sdiag_family] == NULL)
		request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				NETLINK_SOCK_DIAG, req->sdiag_family);

	mutex_lock(&sock_diag_table_mutex);
	hndl = sock_diag_handlers[req->sdiag_family];
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	if (hndl == NULL)
		err = -ENOENT;
	else
		err = hndl->dump(skb, nlh);
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	mutex_unlock(&sock_diag_table_mutex);
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	return err;
}

static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	int ret;

	switch (nlh->nlmsg_type) {
	case TCPDIAG_GETSOCK:
	case DCCPDIAG_GETSOCK:
		if (inet_rcv_compat == NULL)
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
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					NETLINK_SOCK_DIAG, AF_INET);
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		mutex_lock(&sock_diag_table_mutex);
		if (inet_rcv_compat != NULL)
			ret = inet_rcv_compat(skb, nlh);
		else
			ret = -EOPNOTSUPP;
		mutex_unlock(&sock_diag_table_mutex);

		return ret;
	case SOCK_DIAG_BY_FAMILY:
		return __sock_diag_rcv_msg(skb, nlh);
	default:
		return -EINVAL;
	}
}

static DEFINE_MUTEX(sock_diag_mutex);

static void sock_diag_rcv(struct sk_buff *skb)
{
	mutex_lock(&sock_diag_mutex);
	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	mutex_unlock(&sock_diag_mutex);
}

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static int sock_diag_bind(struct net *net, int group)
{
	switch (group) {
	case SKNLGRP_INET_TCP_DESTROY:
	case SKNLGRP_INET_UDP_DESTROY:
		if (!sock_diag_handlers[AF_INET])
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				       NETLINK_SOCK_DIAG, AF_INET);
		break;
	case SKNLGRP_INET6_TCP_DESTROY:
	case SKNLGRP_INET6_UDP_DESTROY:
		if (!sock_diag_handlers[AF_INET6])
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				       NETLINK_SOCK_DIAG, AF_INET);
		break;
	}
	return 0;
}

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static int __net_init diag_net_init(struct net *net)
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{
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	struct netlink_kernel_cfg cfg = {
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		.groups	= SKNLGRP_MAX,
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		.input	= sock_diag_rcv,
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		.bind	= sock_diag_bind,
		.flags	= NL_CFG_F_NONROOT_RECV,
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	};

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	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
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	return net->diag_nlsk == NULL ? -ENOMEM : 0;
}

static void __net_exit diag_net_exit(struct net *net)
{
	netlink_kernel_release(net->diag_nlsk);
	net->diag_nlsk = NULL;
}

static struct pernet_operations diag_net_ops = {
	.init = diag_net_init,
	.exit = diag_net_exit,
};

static int __init sock_diag_init(void)
{
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	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
	BUG_ON(!broadcast_wq);
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	return register_pernet_subsys(&diag_net_ops);
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}

static void __exit sock_diag_exit(void)
{
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	unregister_pernet_subsys(&diag_net_ops);
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	destroy_workqueue(broadcast_wq);
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}

module_init(sock_diag_init);
module_exit(sock_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);
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