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authorPablo Neira Ayuso <pablo@netfilter.org>2012-05-08 19:45:28 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2012-05-08 20:25:42 +0200
commitd16cf20e2f2f13411eece7f7fb72c17d141c4a84 (patch)
tree8154b3db8cdbb4b8d9f35d4c407cfe961253f0b4 /net/ipv4
parent6714cf5465d2803a21c6a46c1ea747795a8889fa (diff)
downloadop-kernel-dev-d16cf20e2f2f13411eece7f7fb72c17d141c4a84.zip
op-kernel-dev-d16cf20e2f2f13411eece7f7fb72c17d141c4a84.tar.gz
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/Makefile3
-rw-r--r--net/ipv4/netfilter/ip_queue.c639
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);
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