netfilter: remove ip_queue support

This patch removes ip_queue support which was marked as obsolete
years ago. The nfnetlink_queue modules provides more advanced
user-space packet queueing mechanism.

This patch also removes capability code included in SELinux that
refers to ip_queue. Otherwise, we break compilation.

Several warning has been sent regarding this to the mailing list
in the past month without anyone rising the hand to stop this
with some strong argument.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

2 files changed, 0 insertions, 642 deletions

diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 240b684..c20674d 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -66,6 +66,3 @@ obj-$(CONFIG_IP_NF_ARP_MANGLE) += arpt_mangle.o
 
 # just filtering instance of ARP tables for now
 obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
-
-obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
-
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
deleted file mode 100644
index 09775a1..0000000
--- a/net/ipv4/netfilter/ip_queue.c
+++ /dev/null
@@ -1,639 +0,0 @@
-/*
- * This is a module which is used for queueing IPv4 packets and
- * communicating with userspace via netlink.
- *
- * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
- * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/init.h>
-#include <linux/ip.h>
-#include <linux/notifier.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_queue.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netlink.h>
-#include <linux/spinlock.h>
-#include <linux/sysctl.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/security.h>
-#include <linux/net.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <net/net_namespace.h>
-#include <net/sock.h>
-#include <net/route.h>
-#include <net/netfilter/nf_queue.h>
-#include <net/ip.h>
-
-#define IPQ_QMAX_DEFAULT 1024
-#define IPQ_PROC_FS_NAME "ip_queue"
-#define NET_IPQ_QMAX 2088
-#define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
-
-typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long);
-
-static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
-static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
-static DEFINE_SPINLOCK(queue_lock);
-static int peer_pid __read_mostly;
-static unsigned int copy_range __read_mostly;
-static unsigned int queue_total;
-static unsigned int queue_dropped = 0;
-static unsigned int queue_user_dropped = 0;
-static struct sock *ipqnl __read_mostly;
-static LIST_HEAD(queue_list);
-static DEFINE_MUTEX(ipqnl_mutex);
-
-static inline void
-__ipq_enqueue_entry(struct nf_queue_entry *entry)
-{
-       list_add_tail(&entry->list, &queue_list);
-       queue_total++;
-}
-
-static inline int
-__ipq_set_mode(unsigned char mode, unsigned int range)
-{
-	int status = 0;
-
-	switch(mode) {
-	case IPQ_COPY_NONE:
-	case IPQ_COPY_META:
-		copy_mode = mode;
-		copy_range = 0;
-		break;
-
-	case IPQ_COPY_PACKET:
-		if (range > 0xFFFF)
-			range = 0xFFFF;
-		copy_range = range;
-		copy_mode = mode;
-		break;
-
-	default:
-		status = -EINVAL;
-
-	}
-	return status;
-}
-
-static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data);
-
-static inline void
-__ipq_reset(void)
-{
-	peer_pid = 0;
-	net_disable_timestamp();
-	__ipq_set_mode(IPQ_COPY_NONE, 0);
-	__ipq_flush(NULL, 0);
-}
-
-static struct nf_queue_entry *
-ipq_find_dequeue_entry(unsigned long id)
-{
-	struct nf_queue_entry *entry = NULL, *i;
-
-	spin_lock_bh(&queue_lock);
-
-	list_for_each_entry(i, &queue_list, list) {
-		if ((unsigned long)i == id) {
-			entry = i;
-			break;
-		}
-	}
-
-	if (entry) {
-		list_del(&entry->list);
-		queue_total--;
-	}
-
-	spin_unlock_bh(&queue_lock);
-	return entry;
-}
-
-static void
-__ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
-{
-	struct nf_queue_entry *entry, *next;
-
-	list_for_each_entry_safe(entry, next, &queue_list, list) {
-		if (!cmpfn || cmpfn(entry, data)) {
-			list_del(&entry->list);
-			queue_total--;
-			nf_reinject(entry, NF_DROP);
-		}
-	}
-}
-
-static void
-ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
-{
-	spin_lock_bh(&queue_lock);
-	__ipq_flush(cmpfn, data);
-	spin_unlock_bh(&queue_lock);
-}
-
-static struct sk_buff *
-ipq_build_packet_message(struct nf_queue_entry *entry, int *errp)
-{
-	sk_buff_data_t old_tail;
-	size_t size = 0;
-	size_t data_len = 0;
-	struct sk_buff *skb;
-	struct ipq_packet_msg *pmsg;
-	struct nlmsghdr *nlh;
-	struct timeval tv;
-
-	switch (ACCESS_ONCE(copy_mode)) {
-	case IPQ_COPY_META:
-	case IPQ_COPY_NONE:
-		size = NLMSG_SPACE(sizeof(*pmsg));
-		break;
-
-	case IPQ_COPY_PACKET:
-		if (entry->skb->ip_summed == CHECKSUM_PARTIAL &&
-		    (*errp = skb_checksum_help(entry->skb)))
-			return NULL;
-
-		data_len = ACCESS_ONCE(copy_range);
-		if (data_len == 0 || data_len > entry->skb->len)
-			data_len = entry->skb->len;
-
-		size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
-		break;
-
-	default:
-		*errp = -EINVAL;
-		return NULL;
-	}
-
-	skb = alloc_skb(size, GFP_ATOMIC);
-	if (!skb)
-		goto nlmsg_failure;
-
-	old_tail = skb->tail;
-	nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
-	pmsg = NLMSG_DATA(nlh);
-	memset(pmsg, 0, sizeof(*pmsg));
-
-	pmsg->packet_id       = (unsigned long )entry;
-	pmsg->data_len        = data_len;
-	tv = ktime_to_timeval(entry->skb->tstamp);
-	pmsg->timestamp_sec   = tv.tv_sec;
-	pmsg->timestamp_usec  = tv.tv_usec;
-	pmsg->mark            = entry->skb->mark;
-	pmsg->hook            = entry->hook;
-	pmsg->hw_protocol     = entry->skb->protocol;
-
-	if (entry->indev)
-		strcpy(pmsg->indev_name, entry->indev->name);
-	else
-		pmsg->indev_name[0] = '\0';
-
-	if (entry->outdev)
-		strcpy(pmsg->outdev_name, entry->outdev->name);
-	else
-		pmsg->outdev_name[0] = '\0';
-
-	if (entry->indev && entry->skb->dev &&
-	    entry->skb->mac_header != entry->skb->network_header) {
-		pmsg->hw_type = entry->skb->dev->type;
-		pmsg->hw_addrlen = dev_parse_header(entry->skb,
-						    pmsg->hw_addr);
-	}
-
-	if (data_len)
-		if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
-			BUG();
-
-	nlh->nlmsg_len = skb->tail - old_tail;
-	return skb;
-
-nlmsg_failure:
-	kfree_skb(skb);
-	*errp = -EINVAL;
-	printk(KERN_ERR "ip_queue: error creating packet message\n");
-	return NULL;
-}
-
-static int
-ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
-{
-	int status = -EINVAL;
-	struct sk_buff *nskb;
-
-	if (copy_mode == IPQ_COPY_NONE)
-		return -EAGAIN;
-
-	nskb = ipq_build_packet_message(entry, &status);
-	if (nskb == NULL)
-		return status;
-
-	spin_lock_bh(&queue_lock);
-
-	if (!peer_pid)
-		goto err_out_free_nskb;
-
-	if (queue_total >= queue_maxlen) {
-		queue_dropped++;
-		status = -ENOSPC;
-		if (net_ratelimit())
-			  printk (KERN_WARNING "ip_queue: full at %d entries, "
-				  "dropping packets(s). Dropped: %d\n", queue_total,
-				  queue_dropped);
-		goto err_out_free_nskb;
-	}
-
-	/* netlink_unicast will either free the nskb or attach it to a socket */
-	status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
-	if (status < 0) {
-		queue_user_dropped++;
-		goto err_out_unlock;
-	}
-
-	__ipq_enqueue_entry(entry);
-
-	spin_unlock_bh(&queue_lock);
-	return status;
-
-err_out_free_nskb:
-	kfree_skb(nskb);
-
-err_out_unlock:
-	spin_unlock_bh(&queue_lock);
-	return status;
-}
-
-static int
-ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e)
-{
-	int diff;
-	struct iphdr *user_iph = (struct iphdr *)v->payload;
-	struct sk_buff *nskb;
-
-	if (v->data_len < sizeof(*user_iph))
-		return 0;
-	diff = v->data_len - e->skb->len;
-	if (diff < 0) {
-		if (pskb_trim(e->skb, v->data_len))
-			return -ENOMEM;
-	} else if (diff > 0) {
-		if (v->data_len > 0xFFFF)
-			return -EINVAL;
-		if (diff > skb_tailroom(e->skb)) {
-			nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
-					       diff, GFP_ATOMIC);
-			if (!nskb) {
-				printk(KERN_WARNING "ip_queue: error "
-				      "in mangle, dropping packet\n");
-				return -ENOMEM;
-			}
-			kfree_skb(e->skb);
-			e->skb = nskb;
-		}
-		skb_put(e->skb, diff);
-	}
-	if (!skb_make_writable(e->skb, v->data_len))
-		return -ENOMEM;
-	skb_copy_to_linear_data(e->skb, v->payload, v->data_len);
-	e->skb->ip_summed = CHECKSUM_NONE;
-
-	return 0;
-}
-
-static int
-ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
-{
-	struct nf_queue_entry *entry;
-
-	if (vmsg->value > NF_MAX_VERDICT || vmsg->value == NF_STOLEN)
-		return -EINVAL;
-
-	entry = ipq_find_dequeue_entry(vmsg->id);
-	if (entry == NULL)
-		return -ENOENT;
-	else {
-		int verdict = vmsg->value;
-
-		if (vmsg->data_len && vmsg->data_len == len)
-			if (ipq_mangle_ipv4(vmsg, entry) < 0)
-				verdict = NF_DROP;
-
-		nf_reinject(entry, verdict);
-		return 0;
-	}
-}
-
-static int
-ipq_set_mode(unsigned char mode, unsigned int range)
-{
-	int status;
-
-	spin_lock_bh(&queue_lock);
-	status = __ipq_set_mode(mode, range);
-	spin_unlock_bh(&queue_lock);
-	return status;
-}
-
-static int
-ipq_receive_peer(struct ipq_peer_msg *pmsg,
-		 unsigned char type, unsigned int len)
-{
-	int status = 0;
-
-	if (len < sizeof(*pmsg))
-		return -EINVAL;
-
-	switch (type) {
-	case IPQM_MODE:
-		status = ipq_set_mode(pmsg->msg.mode.value,
-				      pmsg->msg.mode.range);
-		break;
-
-	case IPQM_VERDICT:
-		status = ipq_set_verdict(&pmsg->msg.verdict,
-					 len - sizeof(*pmsg));
-		break;
-	default:
-		status = -EINVAL;
-	}
-	return status;
-}
-
-static int
-dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
-{
-	if (entry->indev)
-		if (entry->indev->ifindex == ifindex)
-			return 1;
-	if (entry->outdev)
-		if (entry->outdev->ifindex == ifindex)
-			return 1;
-#ifdef CONFIG_BRIDGE_NETFILTER
-	if (entry->skb->nf_bridge) {
-		if (entry->skb->nf_bridge->physindev &&
-		    entry->skb->nf_bridge->physindev->ifindex == ifindex)
-			return 1;
-		if (entry->skb->nf_bridge->physoutdev &&
-		    entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
-			return 1;
-	}
-#endif
-	return 0;
-}
-
-static void
-ipq_dev_drop(int ifindex)
-{
-	ipq_flush(dev_cmp, ifindex);
-}
-
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
-static inline void
-__ipq_rcv_skb(struct sk_buff *skb)
-{
-	int status, type, pid, flags;
-	unsigned int nlmsglen, skblen;
-	struct nlmsghdr *nlh;
-	bool enable_timestamp = false;
-
-	skblen = skb->len;
-	if (skblen < sizeof(*nlh))
-		return;
-
-	nlh = nlmsg_hdr(skb);
-	nlmsglen = nlh->nlmsg_len;
-	if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
-		return;
-
-	pid = nlh->nlmsg_pid;
-	flags = nlh->nlmsg_flags;
-
-	if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
-		RCV_SKB_FAIL(-EINVAL);
-
-	if (flags & MSG_TRUNC)
-		RCV_SKB_FAIL(-ECOMM);
-
-	type = nlh->nlmsg_type;
-	if (type < NLMSG_NOOP || type >= IPQM_MAX)
-		RCV_SKB_FAIL(-EINVAL);
-
-	if (type <= IPQM_BASE)
-		return;
-
-	if (!capable(CAP_NET_ADMIN))
-		RCV_SKB_FAIL(-EPERM);
-
-	spin_lock_bh(&queue_lock);
-
-	if (peer_pid) {
-		if (peer_pid != pid) {
-			spin_unlock_bh(&queue_lock);
-			RCV_SKB_FAIL(-EBUSY);
-		}
-	} else {
-		enable_timestamp = true;
-		peer_pid = pid;
-	}
-
-	spin_unlock_bh(&queue_lock);
-	if (enable_timestamp)
-		net_enable_timestamp();
-	status = ipq_receive_peer(NLMSG_DATA(nlh), type,
-				  nlmsglen - NLMSG_LENGTH(0));
-	if (status < 0)
-		RCV_SKB_FAIL(status);
-
-	if (flags & NLM_F_ACK)
-		netlink_ack(skb, nlh, 0);
-}
-
-static void
-ipq_rcv_skb(struct sk_buff *skb)
-{
-	mutex_lock(&ipqnl_mutex);
-	__ipq_rcv_skb(skb);
-	mutex_unlock(&ipqnl_mutex);
-}
-
-static int
-ipq_rcv_dev_event(struct notifier_block *this,
-		  unsigned long event, void *ptr)
-{
-	struct net_device *dev = ptr;
-
-	if (!net_eq(dev_net(dev), &init_net))
-		return NOTIFY_DONE;
-
-	/* Drop any packets associated with the downed device */
-	if (event == NETDEV_DOWN)
-		ipq_dev_drop(dev->ifindex);
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_dev_notifier = {
-	.notifier_call	= ipq_rcv_dev_event,
-};
-
-static int
-ipq_rcv_nl_event(struct notifier_block *this,
-		 unsigned long event, void *ptr)
-{
-	struct netlink_notify *n = ptr;
-
-	if (event == NETLINK_URELEASE && n->protocol == NETLINK_FIREWALL) {
-		spin_lock_bh(&queue_lock);
-		if ((net_eq(n->net, &init_net)) && (n->pid == peer_pid))
-			__ipq_reset();
-		spin_unlock_bh(&queue_lock);
-	}
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_nl_notifier = {
-	.notifier_call	= ipq_rcv_nl_event,
-};
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table_header *ipq_sysctl_header;
-
-static ctl_table ipq_table[] = {
-	{
-		.procname	= NET_IPQ_QMAX_NAME,
-		.data		= &queue_maxlen,
-		.maxlen		= sizeof(queue_maxlen),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-	{ }
-};
-#endif
-
-#ifdef CONFIG_PROC_FS
-static int ip_queue_show(struct seq_file *m, void *v)
-{
-	spin_lock_bh(&queue_lock);
-
-	seq_printf(m,
-		      "Peer PID          : %d\n"
-		      "Copy mode         : %hu\n"
-		      "Copy range        : %u\n"
-		      "Queue length      : %u\n"
-		      "Queue max. length : %u\n"
-		      "Queue dropped     : %u\n"
-		      "Netlink dropped   : %u\n",
-		      peer_pid,
-		      copy_mode,
-		      copy_range,
-		      queue_total,
-		      queue_maxlen,
-		      queue_dropped,
-		      queue_user_dropped);
-
-	spin_unlock_bh(&queue_lock);
-	return 0;
-}
-
-static int ip_queue_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, ip_queue_show, NULL);
-}
-
-static const struct file_operations ip_queue_proc_fops = {
-	.open		= ip_queue_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-	.owner		= THIS_MODULE,
-};
-#endif
-
-static const struct nf_queue_handler nfqh = {
-	.name	= "ip_queue",
-	.outfn	= &ipq_enqueue_packet,
-};
-
-static int __init ip_queue_init(void)
-{
-	int status = -ENOMEM;
-	struct proc_dir_entry *proc __maybe_unused;
-
-	netlink_register_notifier(&ipq_nl_notifier);
-	ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0,
-				      ipq_rcv_skb, NULL, THIS_MODULE);
-	if (ipqnl == NULL) {
-		printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
-		goto cleanup_netlink_notifier;
-	}
-
-#ifdef CONFIG_PROC_FS
-	proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net,
-			   &ip_queue_proc_fops);
-	if (!proc) {
-		printk(KERN_ERR "ip_queue: failed to create proc entry\n");
-		goto cleanup_ipqnl;
-	}
-#endif
-	register_netdevice_notifier(&ipq_dev_notifier);
-#ifdef CONFIG_SYSCTL
-	ipq_sysctl_header = register_net_sysctl(&init_net, "net/ipv4", ipq_table);
-#endif
-	status = nf_register_queue_handler(NFPROTO_IPV4, &nfqh);
-	if (status < 0) {
-		printk(KERN_ERR "ip_queue: failed to register queue handler\n");
-		goto cleanup_sysctl;
-	}
-	return status;
-
-cleanup_sysctl:
-#ifdef CONFIG_SYSCTL
-	unregister_net_sysctl_table(ipq_sysctl_header);
-#endif
-	unregister_netdevice_notifier(&ipq_dev_notifier);
-	proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
-cleanup_ipqnl: __maybe_unused
-	netlink_kernel_release(ipqnl);
-	mutex_lock(&ipqnl_mutex);
-	mutex_unlock(&ipqnl_mutex);
-
-cleanup_netlink_notifier:
-	netlink_unregister_notifier(&ipq_nl_notifier);
-	return status;
-}
-
-static void __exit ip_queue_fini(void)
-{
-	nf_unregister_queue_handlers(&nfqh);
-
-	ipq_flush(NULL, 0);
-
-#ifdef CONFIG_SYSCTL
-	unregister_net_sysctl_table(ipq_sysctl_header);
-#endif
-	unregister_netdevice_notifier(&ipq_dev_notifier);
-	proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
-
-	netlink_kernel_release(ipqnl);
-	mutex_lock(&ipqnl_mutex);
-	mutex_unlock(&ipqnl_mutex);
-
-	netlink_unregister_notifier(&ipq_nl_notifier);
-}
-
-MODULE_DESCRIPTION("IPv4 packet queue handler");
-MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_FIREWALL);
-
-module_init(ip_queue_init);
-module_exit(ip_queue_fini);